drivers/power/ab8500_charger.c

   1 /*
   2  * Copyright (C) ST-Ericsson SA 2012
   3  *
   4  * Charger driver for AB8500
   5  *
   6  * License Terms: GNU General Public License v2
   7  * Author:
   8  *      Johan Palsson <johan.palsson@stericsson.com>
   9  *      Karl Komierowski <karl.komierowski@stericsson.com>
  10  *      Arun R Murthy <arun.murthy@stericsson.com>
  11  */
  12
  13 #include <linux/init.h>
  14 #include <linux/module.h>
  15 #include <linux/device.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/delay.h>
  18 #include <linux/notifier.h>
  19 #include <linux/slab.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/power_supply.h>
  22 #include <linux/completion.h>
  23 #include <linux/regulator/consumer.h>
  24 #include <linux/err.h>
  25 #include <linux/workqueue.h>
  26 #include <linux/kobject.h>
  27 #include <linux/of.h>
  28 #include <linux/mfd/core.h>
  29 #include <linux/mfd/abx500/ab8500.h>
  30 #include <linux/mfd/abx500.h>
  31 #include <linux/mfd/abx500/ab8500-bm.h>
  32 #include <linux/mfd/abx500/ab8500-gpadc.h>
  33 #include <linux/mfd/abx500/ux500_chargalg.h>
  34 #include <linux/usb/otg.h>
  35 #include <linux/mutex.h>
  36
  37 /* Charger constants */
  38 #define NO_PW_CONN                      0
  39 #define AC_PW_CONN                      1
  40 #define USB_PW_CONN                     2
  41
  42 #define MAIN_WDOG_ENA                   0x01
  43 #define MAIN_WDOG_KICK                  0x02
  44 #define MAIN_WDOG_DIS                   0x00
  45 #define CHARG_WD_KICK                   0x01
  46 #define MAIN_CH_ENA                     0x01
  47 #define MAIN_CH_NO_OVERSHOOT_ENA_N      0x02
  48 #define USB_CH_ENA                      0x01
  49 #define USB_CHG_NO_OVERSHOOT_ENA_N      0x02
  50 #define MAIN_CH_DET                     0x01
  51 #define MAIN_CH_CV_ON                   0x04
  52 #define USB_CH_CV_ON                    0x08
  53 #define VBUS_DET_DBNC100                0x02
  54 #define VBUS_DET_DBNC1                  0x01
  55 #define OTP_ENABLE_WD                   0x01
  56 #define DROP_COUNT_RESET                0x01
  57 #define USB_CH_DET                      0x01
  58
  59 #define MAIN_CH_INPUT_CURR_SHIFT        4
  60 #define VBUS_IN_CURR_LIM_SHIFT          4
  61 #define AB8540_VBUS_IN_CURR_LIM_SHIFT   2
  62 #define AUTO_VBUS_IN_CURR_LIM_SHIFT     4
  63 #define AB8540_AUTO_VBUS_IN_CURR_MASK   0x3F
  64 #define VBUS_IN_CURR_LIM_RETRY_SET_TIME 30 /* seconds */
  65
  66 #define LED_INDICATOR_PWM_ENA           0x01
  67 #define LED_INDICATOR_PWM_DIS           0x00
  68 #define LED_IND_CUR_5MA                 0x04
  69 #define LED_INDICATOR_PWM_DUTY_252_256  0xBF
  70
  71 /* HW failure constants */
  72 #define MAIN_CH_TH_PROT                 0x02
  73 #define VBUS_CH_NOK                     0x08
  74 #define USB_CH_TH_PROT                  0x02
  75 #define VBUS_OVV_TH                     0x01
  76 #define MAIN_CH_NOK                     0x01
  77 #define VBUS_DET                        0x80
  78
  79 #define MAIN_CH_STATUS2_MAINCHGDROP             0x80
  80 #define MAIN_CH_STATUS2_MAINCHARGERDETDBNC      0x40
  81 #define USB_CH_VBUSDROP                         0x40
  82 #define USB_CH_VBUSDETDBNC                      0x01
  83
  84 /* UsbLineStatus register bit masks */
  85 #define AB8500_USB_LINK_STATUS          0x78
  86 #define AB8505_USB_LINK_STATUS          0xF8
  87 #define AB8500_STD_HOST_SUSP            0x18
  88 #define USB_LINK_STATUS_SHIFT           3
  89
  90 /* Watchdog timeout constant */
  91 #define WD_TIMER                        0x30 /* 4min */
  92 #define WD_KICK_INTERVAL                (60 * HZ)
  93
  94 /* Lowest charger voltage is 3.39V -> 0x4E */
  95 #define LOW_VOLT_REG                    0x4E
  96
  97 /* Step up/down delay in us */
  98 #define STEP_UDELAY                     1000
  99
 100 #define CHARGER_STATUS_POLL 10 /* in ms */
 101
 102 #define CHG_WD_INTERVAL                 (60 * HZ)
 103
 104 #define AB8500_SW_CONTROL_FALLBACK      0x03
 105 /* Wait for enumeration before charing in us */
 106 #define WAIT_ACA_RID_ENUMERATION        (5 * 1000)
 107 /*External charger control*/
 108 #define AB8500_SYS_CHARGER_CONTROL_REG          0x52
 109 #define EXTERNAL_CHARGER_DISABLE_REG_VAL        0x03
 110 #define EXTERNAL_CHARGER_ENABLE_REG_VAL         0x07
 111
 112 /* UsbLineStatus register - usb types */
 113 enum ab8500_charger_link_status {
 114         USB_STAT_NOT_CONFIGURED,
 115         USB_STAT_STD_HOST_NC,
 116         USB_STAT_STD_HOST_C_NS,
 117         USB_STAT_STD_HOST_C_S,
 118         USB_STAT_HOST_CHG_NM,
 119         USB_STAT_HOST_CHG_HS,
 120         USB_STAT_HOST_CHG_HS_CHIRP,
 121         USB_STAT_DEDICATED_CHG,
 122         USB_STAT_ACA_RID_A,
 123         USB_STAT_ACA_RID_B,
 124         USB_STAT_ACA_RID_C_NM,
 125         USB_STAT_ACA_RID_C_HS,
 126         USB_STAT_ACA_RID_C_HS_CHIRP,
 127         USB_STAT_HM_IDGND,
 128         USB_STAT_RESERVED,
 129         USB_STAT_NOT_VALID_LINK,
 130         USB_STAT_PHY_EN,
 131         USB_STAT_SUP_NO_IDGND_VBUS,
 132         USB_STAT_SUP_IDGND_VBUS,
 133         USB_STAT_CHARGER_LINE_1,
 134         USB_STAT_CARKIT_1,
 135         USB_STAT_CARKIT_2,
 136         USB_STAT_ACA_DOCK_CHARGER,
 137 };
 138
 139 enum ab8500_usb_state {
 140         AB8500_BM_USB_STATE_RESET_HS,   /* HighSpeed Reset */
 141         AB8500_BM_USB_STATE_RESET_FS,   /* FullSpeed/LowSpeed Reset */
 142         AB8500_BM_USB_STATE_CONFIGURED,
 143         AB8500_BM_USB_STATE_SUSPEND,
 144         AB8500_BM_USB_STATE_RESUME,
 145         AB8500_BM_USB_STATE_MAX,
 146 };
 147
 148 /* VBUS input current limits supported in AB8500 in mA */
 149 #define USB_CH_IP_CUR_LVL_0P05          50
 150 #define USB_CH_IP_CUR_LVL_0P09          98
 151 #define USB_CH_IP_CUR_LVL_0P19          193
 152 #define USB_CH_IP_CUR_LVL_0P29          290
 153 #define USB_CH_IP_CUR_LVL_0P38          380
 154 #define USB_CH_IP_CUR_LVL_0P45          450
 155 #define USB_CH_IP_CUR_LVL_0P5           500
 156 #define USB_CH_IP_CUR_LVL_0P6           600
 157 #define USB_CH_IP_CUR_LVL_0P7           700
 158 #define USB_CH_IP_CUR_LVL_0P8           800
 159 #define USB_CH_IP_CUR_LVL_0P9           900
 160 #define USB_CH_IP_CUR_LVL_1P0           1000
 161 #define USB_CH_IP_CUR_LVL_1P1           1100
 162 #define USB_CH_IP_CUR_LVL_1P3           1300
 163 #define USB_CH_IP_CUR_LVL_1P4           1400
 164 #define USB_CH_IP_CUR_LVL_1P5           1500
 165
 166 #define VBAT_TRESH_IP_CUR_RED           3800
 167
 168 #define to_ab8500_charger_usb_device_info(x) container_of((x), \
 169         struct ab8500_charger, usb_chg)
 170 #define to_ab8500_charger_ac_device_info(x) container_of((x), \
 171         struct ab8500_charger, ac_chg)
 172
 173 /**
 174  * struct ab8500_charger_interrupts - ab8500 interupts
 175  * @name:       name of the interrupt
 176  * @isr         function pointer to the isr
 177  */
 178 struct ab8500_charger_interrupts {
 179         char *name;
 180         irqreturn_t (*isr)(int irq, void *data);
 181 };
 182
 183 struct ab8500_charger_info {
 184         int charger_connected;
 185         int charger_online;
 186         int charger_voltage;
 187         int cv_active;
 188         bool wd_expired;
 189         int charger_current;
 190 };
 191
 192 struct ab8500_charger_event_flags {
 193         bool mainextchnotok;
 194         bool main_thermal_prot;
 195         bool usb_thermal_prot;
 196         bool vbus_ovv;
 197         bool usbchargernotok;
 198         bool chgwdexp;
 199         bool vbus_collapse;
 200         bool vbus_drop_end;
 201 };
 202
 203 struct ab8500_charger_usb_state {
 204         int usb_current;
 205         int usb_current_tmp;
 206         enum ab8500_usb_state state;
 207         enum ab8500_usb_state state_tmp;
 208         spinlock_t usb_lock;
 209 };
 210
 211 struct ab8500_charger_max_usb_in_curr {
 212         int usb_type_max;
 213         int set_max;
 214         int calculated_max;
 215 };
 216
 217 /**
 218  * struct ab8500_charger - ab8500 Charger device information
 219  * @dev:                Pointer to the structure device
 220  * @vbus_detected:      VBUS detected
 221  * @vbus_detected_start:
 222  *                      VBUS detected during startup
 223  * @ac_conn:            This will be true when the AC charger has been plugged
 224  * @vddadc_en_ac:       Indicate if VDD ADC supply is enabled because AC
 225  *                      charger is enabled
 226  * @vddadc_en_usb:      Indicate if VDD ADC supply is enabled because USB
 227  *                      charger is enabled
 228  * @vbat                Battery voltage
 229  * @old_vbat            Previously measured battery voltage
 230  * @usb_device_is_unrecognised  USB device is unrecognised by the hardware
 231  * @autopower           Indicate if we should have automatic pwron after pwrloss
 232  * @autopower_cfg       platform specific power config support for "pwron after pwrloss"
 233  * @invalid_charger_detect_state State when forcing AB to use invalid charger
 234  * @is_aca_rid:         Incicate if accessory is ACA type
 235  * @current_stepping_sessions:
 236  *                      Counter for current stepping sessions
 237  * @parent:             Pointer to the struct ab8500
 238  * @gpadc:              Pointer to the struct gpadc
 239  * @bm:                 Platform specific battery management information
 240  * @flags:              Structure for information about events triggered
 241  * @usb_state:          Structure for usb stack information
 242  * @max_usb_in_curr:    Max USB charger input current
 243  * @ac_chg:             AC charger power supply
 244  * @usb_chg:            USB charger power supply
 245  * @ac:                 Structure that holds the AC charger properties
 246  * @usb:                Structure that holds the USB charger properties
 247  * @regu:               Pointer to the struct regulator
 248  * @charger_wq:         Work queue for the IRQs and checking HW state
 249  * @usb_ipt_crnt_lock:  Lock to protect VBUS input current setting from mutuals
 250  * @pm_lock:            Lock to prevent system to suspend
 251  * @check_vbat_work     Work for checking vbat threshold to adjust vbus current
 252  * @check_hw_failure_work:      Work for checking HW state
 253  * @check_usbchgnotok_work:     Work for checking USB charger not ok status
 254  * @kick_wd_work:               Work for kicking the charger watchdog in case
 255  *                              of ABB rev 1.* due to the watchog logic bug
 256  * @ac_charger_attached_work:   Work for checking if AC charger is still
 257  *                              connected
 258  * @usb_charger_attached_work:  Work for checking if USB charger is still
 259  *                              connected
 260  * @ac_work:                    Work for checking AC charger connection
 261  * @detect_usb_type_work:       Work for detecting the USB type connected
 262  * @usb_link_status_work:       Work for checking the new USB link status
 263  * @usb_state_changed_work:     Work for checking USB state
 264  * @attach_work:                Work for detecting USB type
 265  * @vbus_drop_end_work:         Work for detecting VBUS drop end
 266  * @check_main_thermal_prot_work:
 267  *                              Work for checking Main thermal status
 268  * @check_usb_thermal_prot_work:
 269  *                              Work for checking USB thermal status
 270  * @charger_attached_mutex:     For controlling the wakelock
 271  */
 272 struct ab8500_charger {
 273         struct device *dev;
 274         bool vbus_detected;
 275         bool vbus_detected_start;
 276         bool ac_conn;
 277         bool vddadc_en_ac;
 278         bool vddadc_en_usb;
 279         int vbat;
 280         int old_vbat;
 281         bool usb_device_is_unrecognised;
 282         bool autopower;
 283         bool autopower_cfg;
 284         int invalid_charger_detect_state;
 285         int is_aca_rid;
 286         atomic_t current_stepping_sessions;
 287         struct ab8500 *parent;
 288         struct ab8500_gpadc *gpadc;
 289         struct abx500_bm_data *bm;
 290         struct ab8500_charger_event_flags flags;
 291         struct ab8500_charger_usb_state usb_state;
 292         struct ab8500_charger_max_usb_in_curr max_usb_in_curr;
 293         struct ux500_charger ac_chg;
 294         struct ux500_charger usb_chg;
 295         struct ab8500_charger_info ac;
 296         struct ab8500_charger_info usb;
 297         struct regulator *regu;
 298         struct workqueue_struct *charger_wq;
 299         struct mutex usb_ipt_crnt_lock;
 300         struct delayed_work check_vbat_work;
 301         struct delayed_work check_hw_failure_work;
 302         struct delayed_work check_usbchgnotok_work;
 303         struct delayed_work kick_wd_work;
 304         struct delayed_work usb_state_changed_work;
 305         struct delayed_work attach_work;
 306         struct delayed_work ac_charger_attached_work;
 307         struct delayed_work usb_charger_attached_work;
 308         struct delayed_work vbus_drop_end_work;
 309         struct work_struct ac_work;
 310         struct work_struct detect_usb_type_work;
 311         struct work_struct usb_link_status_work;
 312         struct work_struct check_main_thermal_prot_work;
 313         struct work_struct check_usb_thermal_prot_work;
 314         struct usb_phy *usb_phy;
 315         struct notifier_block nb;
 316         struct mutex charger_attached_mutex;
 317 };
 318
 319 /* AC properties */
 320 static enum power_supply_property ab8500_charger_ac_props[] = {
 321         POWER_SUPPLY_PROP_HEALTH,
 322         POWER_SUPPLY_PROP_PRESENT,
 323         POWER_SUPPLY_PROP_ONLINE,
 324         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 325         POWER_SUPPLY_PROP_VOLTAGE_AVG,
 326         POWER_SUPPLY_PROP_CURRENT_NOW,
 327 };
 328
 329 /* USB properties */
 330 static enum power_supply_property ab8500_charger_usb_props[] = {
 331         POWER_SUPPLY_PROP_HEALTH,
 332         POWER_SUPPLY_PROP_CURRENT_AVG,
 333         POWER_SUPPLY_PROP_PRESENT,
 334         POWER_SUPPLY_PROP_ONLINE,
 335         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 336         POWER_SUPPLY_PROP_VOLTAGE_AVG,
 337         POWER_SUPPLY_PROP_CURRENT_NOW,
 338 };
 339
 340 /*
 341  * Function for enabling and disabling sw fallback mode
 342  * should always be disabled when no charger is connected.
 343  */
 344 static void ab8500_enable_disable_sw_fallback(struct ab8500_charger *di,
 345                 bool fallback)
 346 {
 347         u8 val;
 348         u8 reg;
 349         u8 bank;
 350         u8 bit;
 351         int ret;
 352
 353         dev_dbg(di->dev, "SW Fallback: %d\n", fallback);
 354
 355         if (is_ab8500(di->parent)) {
 356                 bank = 0x15;
 357                 reg = 0x0;
 358                 bit = 3;
 359         } else {
 360                 bank = AB8500_SYS_CTRL1_BLOCK;
 361                 reg = AB8500_SW_CONTROL_FALLBACK;
 362                 bit = 0;
 363         }
 364
 365         /* read the register containing fallback bit */
 366         ret = abx500_get_register_interruptible(di->dev, bank, reg, &val);
 367         if (ret < 0) {
 368                 dev_err(di->dev, "%d read failed\n", __LINE__);
 369                 return;
 370         }
 371
 372         if (is_ab8500(di->parent)) {
 373                 /* enable the OPT emulation registers */
 374                 ret = abx500_set_register_interruptible(di->dev, 0x11, 0x00, 0x2);
 375                 if (ret) {
 376                         dev_err(di->dev, "%d write failed\n", __LINE__);
 377                         goto disable_otp;
 378                 }
 379         }
 380
 381         if (fallback)
 382                 val |= (1 << bit);
 383         else
 384                 val &= ~(1 << bit);
 385
 386         /* write back the changed fallback bit value to register */
 387         ret = abx500_set_register_interruptible(di->dev, bank, reg, val);
 388         if (ret) {
 389                 dev_err(di->dev, "%d write failed\n", __LINE__);
 390         }
 391
 392 disable_otp:
 393         if (is_ab8500(di->parent)) {
 394                 /* disable the set OTP registers again */
 395                 ret = abx500_set_register_interruptible(di->dev, 0x11, 0x00, 0x0);
 396                 if (ret) {
 397                         dev_err(di->dev, "%d write failed\n", __LINE__);
 398                 }
 399         }
 400 }
 401
 402 /**
 403  * ab8500_power_supply_changed - a wrapper with local extentions for
 404  * power_supply_changed
 405  * @di:   pointer to the ab8500_charger structure
 406  * @psy:  pointer to power_supply_that have changed.
 407  *
 408  */
 409 static void ab8500_power_supply_changed(struct ab8500_charger *di,
 410                                         struct power_supply *psy)
 411 {
 412         if (di->autopower_cfg) {
 413                 if (!di->usb.charger_connected &&
 414                     !di->ac.charger_connected &&
 415                     di->autopower) {
 416                         di->autopower = false;
 417                         ab8500_enable_disable_sw_fallback(di, false);
 418                 } else if (!di->autopower &&
 419                            (di->ac.charger_connected ||
 420                             di->usb.charger_connected)) {
 421                         di->autopower = true;
 422                         ab8500_enable_disable_sw_fallback(di, true);
 423                 }
 424         }
 425         power_supply_changed(psy);
 426 }
 427
 428 static void ab8500_charger_set_usb_connected(struct ab8500_charger *di,
 429         bool connected)
 430 {
 431         if (connected != di->usb.charger_connected) {
 432                 dev_dbg(di->dev, "USB connected:%i\n", connected);
 433                 di->usb.charger_connected = connected;
 434
 435                 if (!connected)
 436                         di->flags.vbus_drop_end = false;
 437
 438                 sysfs_notify(&di->usb_chg.psy.dev->kobj, NULL, "present");
 439
 440                 if (connected) {
 441                         mutex_lock(&di->charger_attached_mutex);
 442                         mutex_unlock(&di->charger_attached_mutex);
 443
 444                         if (is_ab8500(di->parent))
 445                                 queue_delayed_work(di->charger_wq,
 446                                            &di->usb_charger_attached_work,
 447                                            HZ);
 448                 } else {
 449                         cancel_delayed_work_sync(&di->usb_charger_attached_work);
 450                         mutex_lock(&di->charger_attached_mutex);
 451                         mutex_unlock(&di->charger_attached_mutex);
 452                 }
 453         }
 454 }
 455
 456 /**
 457  * ab8500_charger_get_ac_voltage() - get ac charger voltage
 458  * @di:         pointer to the ab8500_charger structure
 459  *
 460  * Returns ac charger voltage (on success)
 461  */
 462 static int ab8500_charger_get_ac_voltage(struct ab8500_charger *di)
 463 {
 464         int vch;
 465
 466         /* Only measure voltage if the charger is connected */
 467         if (di->ac.charger_connected) {
 468                 vch = ab8500_gpadc_convert(di->gpadc, MAIN_CHARGER_V);
 469                 if (vch < 0)
 470                         dev_err(di->dev, "%s gpadc conv failed,\n", __func__);
 471         } else {
 472                 vch = 0;
 473         }
 474         return vch;
 475 }
 476
 477 /**
 478  * ab8500_charger_ac_cv() - check if the main charger is in CV mode
 479  * @di:         pointer to the ab8500_charger structure
 480  *
 481  * Returns ac charger CV mode (on success) else error code
 482  */
 483 static int ab8500_charger_ac_cv(struct ab8500_charger *di)
 484 {
 485         u8 val;
 486         int ret = 0;
 487
 488         /* Only check CV mode if the charger is online */
 489         if (di->ac.charger_online) {
 490                 ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
 491                         AB8500_CH_STATUS1_REG, &val);
 492                 if (ret < 0) {
 493                         dev_err(di->dev, "%s ab8500 read failed\n", __func__);
 494                         return 0;
 495                 }
 496
 497                 if (val & MAIN_CH_CV_ON)
 498                         ret = 1;
 499                 else
 500                         ret = 0;
 501         }
 502
 503         return ret;
 504 }
 505
 506 /**
 507  * ab8500_charger_get_vbus_voltage() - get vbus voltage
 508  * @di:         pointer to the ab8500_charger structure
 509  *
 510  * This function returns the vbus voltage.
 511  * Returns vbus voltage (on success)
 512  */
 513 static int ab8500_charger_get_vbus_voltage(struct ab8500_charger *di)
 514 {
 515         int vch;
 516
 517         /* Only measure voltage if the charger is connected */
 518         if (di->usb.charger_connected) {
 519                 vch = ab8500_gpadc_convert(di->gpadc, VBUS_V);
 520                 if (vch < 0)
 521                         dev_err(di->dev, "%s gpadc conv failed\n", __func__);
 522         } else {
 523                 vch = 0;
 524         }
 525         return vch;
 526 }
 527
 528 /**
 529  * ab8500_charger_get_usb_current() - get usb charger current
 530  * @di:         pointer to the ab8500_charger structure
 531  *
 532  * This function returns the usb charger current.
 533  * Returns usb current (on success) and error code on failure
 534  */
 535 static int ab8500_charger_get_usb_current(struct ab8500_charger *di)
 536 {
 537         int ich;
 538
 539         /* Only measure current if the charger is online */
 540         if (di->usb.charger_online) {
 541                 ich = ab8500_gpadc_convert(di->gpadc, USB_CHARGER_C);
 542                 if (ich < 0)
 543                         dev_err(di->dev, "%s gpadc conv failed\n", __func__);
 544         } else {
 545                 ich = 0;
 546         }
 547         return ich;
 548 }
 549
 550 /**
 551  * ab8500_charger_get_ac_current() - get ac charger current
 552  * @di:         pointer to the ab8500_charger structure
 553  *
 554  * This function returns the ac charger current.
 555  * Returns ac current (on success) and error code on failure.
 556  */
 557 static int ab8500_charger_get_ac_current(struct ab8500_charger *di)
 558 {
 559         int ich;
 560
 561         /* Only measure current if the charger is online */
 562         if (di->ac.charger_online) {
 563                 ich = ab8500_gpadc_convert(di->gpadc, MAIN_CHARGER_C);
 564                 if (ich < 0)
 565                         dev_err(di->dev, "%s gpadc conv failed\n", __func__);
 566         } else {
 567                 ich = 0;
 568         }
 569         return ich;
 570 }
 571
 572 /**
 573  * ab8500_charger_usb_cv() - check if the usb charger is in CV mode
 574  * @di:         pointer to the ab8500_charger structure
 575  *
 576  * Returns ac charger CV mode (on success) else error code
 577  */
 578 static int ab8500_charger_usb_cv(struct ab8500_charger *di)
 579 {
 580         int ret;
 581         u8 val;
 582
 583         /* Only check CV mode if the charger is online */
 584         if (di->usb.charger_online) {
 585                 ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
 586                         AB8500_CH_USBCH_STAT1_REG, &val);
 587                 if (ret < 0) {
 588                         dev_err(di->dev, "%s ab8500 read failed\n", __func__);
 589                         return 0;
 590                 }
 591
 592                 if (val & USB_CH_CV_ON)
 593                         ret = 1;
 594                 else
 595                         ret = 0;
 596         } else {
 597                 ret = 0;
 598         }
 599
 600         return ret;
 601 }
 602
 603 /**
 604  * ab8500_charger_detect_chargers() - Detect the connected chargers
 605  * @di:         pointer to the ab8500_charger structure
 606  * @probe:      if probe, don't delay and wait for HW
 607  *
 608  * Returns the type of charger connected.
 609  * For USB it will not mean we can actually charge from it
 610  * but that there is a USB cable connected that we have to
 611  * identify. This is used during startup when we don't get
 612  * interrupts of the charger detection
 613  *
 614  * Returns an integer value, that means,
 615  * NO_PW_CONN  no power supply is connected
 616  * AC_PW_CONN  if the AC power supply is connected
 617  * USB_PW_CONN  if the USB power supply is connected
 618  * AC_PW_CONN + USB_PW_CONN if USB and AC power supplies are both connected
 619  */
 620 static int ab8500_charger_detect_chargers(struct ab8500_charger *di, bool probe)
 621 {
 622         int result = NO_PW_CONN;
 623         int ret;
 624         u8 val;
 625
 626         /* Check for AC charger */
 627         ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
 628                 AB8500_CH_STATUS1_REG, &val);
 629         if (ret < 0) {
 630                 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
 631                 return ret;
 632         }
 633
 634         if (val & MAIN_CH_DET)
 635                 result = AC_PW_CONN;
 636
 637         /* Check for USB charger */
 638
 639         if (!probe) {
 640                 /*
 641                  * AB8500 says VBUS_DET_DBNC1 & VBUS_DET_DBNC100
 642                  * when disconnecting ACA even though no
 643                  * charger was connected. Try waiting a little
 644                  * longer than the 100 ms of VBUS_DET_DBNC100...
 645                  */
 646                 msleep(110);
 647         }
 648         ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
 649                 AB8500_CH_USBCH_STAT1_REG, &val);
 650         if (ret < 0) {
 651                 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
 652                 return ret;
 653         }
 654         dev_dbg(di->dev,
 655                 "%s AB8500_CH_USBCH_STAT1_REG %x\n", __func__,
 656                 val);
 657         if ((val & VBUS_DET_DBNC1) && (val & VBUS_DET_DBNC100))
 658                 result |= USB_PW_CONN;
 659
 660         return result;
 661 }
 662
 663 /**
 664  * ab8500_charger_max_usb_curr() - get the max curr for the USB type
 665  * @di:                 pointer to the ab8500_charger structure
 666  * @link_status:        the identified USB type
 667  *
 668  * Get the maximum current that is allowed to be drawn from the host
 669  * based on the USB type.
 670  * Returns error code in case of failure else 0 on success
 671  */
 672 static int ab8500_charger_max_usb_curr(struct ab8500_charger *di,
 673                 enum ab8500_charger_link_status link_status)
 674 {
 675         int ret = 0;
 676
 677         di->usb_device_is_unrecognised = false;
 678
 679         /*
 680          * Platform only supports USB 2.0.
 681          * This means that charging current from USB source
 682          * is maximum 500 mA. Every occurence of USB_STAT_*_HOST_*
 683          * should set USB_CH_IP_CUR_LVL_0P5.
 684          */
 685
 686         switch (link_status) {
 687         case USB_STAT_STD_HOST_NC:
 688         case USB_STAT_STD_HOST_C_NS:
 689         case USB_STAT_STD_HOST_C_S:
 690                 dev_dbg(di->dev, "USB Type - Standard host is "
 691                         "detected through USB driver\n");
 692                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
 693                 di->is_aca_rid = 0;
 694                 break;
 695         case USB_STAT_HOST_CHG_HS_CHIRP:
 696                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
 697                 di->is_aca_rid = 0;
 698                 break;
 699         case USB_STAT_HOST_CHG_HS:
 700                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
 701                 di->is_aca_rid = 0;
 702                 break;
 703         case USB_STAT_ACA_RID_C_HS:
 704                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P9;
 705                 di->is_aca_rid = 0;
 706                 break;
 707         case USB_STAT_ACA_RID_A:
 708                 /*
 709                  * Dedicated charger level minus maximum current accessory
 710                  * can consume (900mA). Closest level is 500mA
 711                  */
 712                 dev_dbg(di->dev, "USB_STAT_ACA_RID_A detected\n");
 713                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
 714                 di->is_aca_rid = 1;
 715                 break;
 716         case USB_STAT_ACA_RID_B:
 717                 /*
 718                  * Dedicated charger level minus 120mA (20mA for ACA and
 719                  * 100mA for potential accessory). Closest level is 1300mA
 720                  */
 721                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_1P3;
 722                 dev_dbg(di->dev, "USB Type - 0x%02x MaxCurr: %d", link_status,
 723                                 di->max_usb_in_curr.usb_type_max);
 724                 di->is_aca_rid = 1;
 725                 break;
 726         case USB_STAT_HOST_CHG_NM:
 727                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
 728                 di->is_aca_rid = 0;
 729                 break;
 730         case USB_STAT_DEDICATED_CHG:
 731                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_1P5;
 732                 di->is_aca_rid = 0;
 733                 break;
 734         case USB_STAT_ACA_RID_C_HS_CHIRP:
 735         case USB_STAT_ACA_RID_C_NM:
 736                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_1P5;
 737                 di->is_aca_rid = 1;
 738                 break;
 739         case USB_STAT_NOT_CONFIGURED:
 740                 if (di->vbus_detected) {
 741                         di->usb_device_is_unrecognised = true;
 742                         dev_dbg(di->dev, "USB Type - Legacy charger.\n");
 743                         di->max_usb_in_curr.usb_type_max =
 744                                                 USB_CH_IP_CUR_LVL_1P5;
 745                         break;
 746                 }
 747         case USB_STAT_HM_IDGND:
 748                 dev_err(di->dev, "USB Type - Charging not allowed\n");
 749                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P05;
 750                 ret = -ENXIO;
 751                 break;
 752         case USB_STAT_RESERVED:
 753                 if (is_ab8500(di->parent)) {
 754                         di->flags.vbus_collapse = true;
 755                         dev_err(di->dev, "USB Type - USB_STAT_RESERVED "
 756                                                 "VBUS has collapsed\n");
 757                         ret = -ENXIO;
 758                         break;
 759                 } else {
 760                         dev_dbg(di->dev, "USB Type - Charging not allowed\n");
 761                         di->max_usb_in_curr.usb_type_max =
 762                                                 USB_CH_IP_CUR_LVL_0P05;
 763                         dev_dbg(di->dev, "USB Type - 0x%02x MaxCurr: %d",
 764                                 link_status,
 765                                 di->max_usb_in_curr.usb_type_max);
 766                         ret = -ENXIO;
 767                         break;
 768                 }
 769                 break;
 770         case USB_STAT_CARKIT_1:
 771         case USB_STAT_CARKIT_2:
 772         case USB_STAT_ACA_DOCK_CHARGER:
 773         case USB_STAT_CHARGER_LINE_1:
 774                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
 775                 dev_dbg(di->dev, "USB Type - 0x%02x MaxCurr: %d", link_status,
 776                                 di->max_usb_in_curr.usb_type_max);
 777         case USB_STAT_NOT_VALID_LINK:
 778                 dev_err(di->dev, "USB Type invalid - try charging anyway\n");
 779                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
 780                 break;
 781
 782         default:
 783                 dev_err(di->dev, "USB Type - Unknown\n");
 784                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P05;
 785                 ret = -ENXIO;
 786                 break;
 787         };
 788
 789         di->max_usb_in_curr.set_max = di->max_usb_in_curr.usb_type_max;
 790         dev_dbg(di->dev, "USB Type - 0x%02x MaxCurr: %d",
 791                 link_status, di->max_usb_in_curr.set_max);
 792
 793         return ret;
 794 }
 795
 796 /**
 797  * ab8500_charger_read_usb_type() - read the type of usb connected
 798  * @di:         pointer to the ab8500_charger structure
 799  *
 800  * Detect the type of the plugged USB
 801  * Returns error code in case of failure else 0 on success
 802  */
 803 static int ab8500_charger_read_usb_type(struct ab8500_charger *di)
 804 {
 805         int ret;
 806         u8 val;
 807
 808         ret = abx500_get_register_interruptible(di->dev,
 809                 AB8500_INTERRUPT, AB8500_IT_SOURCE21_REG, &val);
 810         if (ret < 0) {
 811                 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
 812                 return ret;
 813         }
 814         if (is_ab8500(di->parent))
 815                 ret = abx500_get_register_interruptible(di->dev, AB8500_USB,
 816                         AB8500_USB_LINE_STAT_REG, &val);
 817         else
 818                 ret = abx500_get_register_interruptible(di->dev,
 819                         AB8500_USB, AB8500_USB_LINK1_STAT_REG, &val);
 820         if (ret < 0) {
 821                 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
 822                 return ret;
 823         }
 824
 825         /* get the USB type */
 826         if (is_ab8500(di->parent))
 827                 val = (val & AB8500_USB_LINK_STATUS) >> USB_LINK_STATUS_SHIFT;
 828         else
 829                 val = (val & AB8505_USB_LINK_STATUS) >> USB_LINK_STATUS_SHIFT;
 830         ret = ab8500_charger_max_usb_curr(di,
 831                 (enum ab8500_charger_link_status) val);
 832
 833         return ret;
 834 }
 835
 836 /**
 837  * ab8500_charger_detect_usb_type() - get the type of usb connected
 838  * @di:         pointer to the ab8500_charger structure
 839  *
 840  * Detect the type of the plugged USB
 841  * Returns error code in case of failure else 0 on success
 842  */
 843 static int ab8500_charger_detect_usb_type(struct ab8500_charger *di)
 844 {
 845         int i, ret;
 846         u8 val;
 847
 848         /*
 849          * On getting the VBUS rising edge detect interrupt there
 850          * is a 250ms delay after which the register UsbLineStatus
 851          * is filled with valid data.
 852          */
 853         for (i = 0; i < 10; i++) {
 854                 msleep(250);
 855                 ret = abx500_get_register_interruptible(di->dev,
 856                         AB8500_INTERRUPT, AB8500_IT_SOURCE21_REG,
 857                         &val);
 858                 dev_dbg(di->dev, "%s AB8500_IT_SOURCE21_REG %x\n",
 859                         __func__, val);
 860                 if (ret < 0) {
 861                         dev_err(di->dev, "%s ab8500 read failed\n", __func__);
 862                         return ret;
 863                 }
 864
 865                 if (is_ab8500(di->parent))
 866                         ret = abx500_get_register_interruptible(di->dev,
 867                                 AB8500_USB, AB8500_USB_LINE_STAT_REG, &val);
 868                 else
 869                         ret = abx500_get_register_interruptible(di->dev,
 870                                 AB8500_USB, AB8500_USB_LINK1_STAT_REG, &val);
 871                 if (ret < 0) {
 872                         dev_err(di->dev, "%s ab8500 read failed\n", __func__);
 873                         return ret;
 874                 }
 875                 dev_dbg(di->dev, "%s AB8500_USB_LINE_STAT_REG %x\n", __func__,
 876                         val);
 877                 /*
 878                  * Until the IT source register is read the UsbLineStatus
 879                  * register is not updated, hence doing the same
 880                  * Revisit this:
 881                  */
 882
 883                 /* get the USB type */
 884                 if (is_ab8500(di->parent))
 885                         val = (val & AB8500_USB_LINK_STATUS) >>
 886                                                         USB_LINK_STATUS_SHIFT;
 887                 else
 888                         val = (val & AB8505_USB_LINK_STATUS) >>
 889                                                         USB_LINK_STATUS_SHIFT;
 890                 if (val)
 891                         break;
 892         }
 893         ret = ab8500_charger_max_usb_curr(di,
 894                 (enum ab8500_charger_link_status) val);
 895
 896         return ret;
 897 }
 898
 899 /*
 900  * This array maps the raw hex value to charger voltage used by the AB8500
 901  * Values taken from the UM0836
 902  */
 903 static int ab8500_charger_voltage_map[] = {
 904         3500 ,
 905         3525 ,
 906         3550 ,
 907         3575 ,
 908         3600 ,
 909         3625 ,
 910         3650 ,
 911         3675 ,
 912         3700 ,
 913         3725 ,
 914         3750 ,
 915         3775 ,
 916         3800 ,
 917         3825 ,
 918         3850 ,
 919         3875 ,
 920         3900 ,
 921         3925 ,
 922         3950 ,
 923         3975 ,
 924         4000 ,
 925         4025 ,
 926         4050 ,
 927         4060 ,
 928         4070 ,
 929         4080 ,
 930         4090 ,
 931         4100 ,
 932         4110 ,
 933         4120 ,
 934         4130 ,
 935         4140 ,
 936         4150 ,
 937         4160 ,
 938         4170 ,
 939         4180 ,
 940         4190 ,
 941         4200 ,
 942         4210 ,
 943         4220 ,
 944         4230 ,
 945         4240 ,
 946         4250 ,
 947         4260 ,
 948         4270 ,
 949         4280 ,
 950         4290 ,
 951         4300 ,
 952         4310 ,
 953         4320 ,
 954         4330 ,
 955         4340 ,
 956         4350 ,
 957         4360 ,
 958         4370 ,
 959         4380 ,
 960         4390 ,
 961         4400 ,
 962         4410 ,
 963         4420 ,
 964         4430 ,
 965         4440 ,
 966         4450 ,
 967         4460 ,
 968         4470 ,
 969         4480 ,
 970         4490 ,
 971         4500 ,
 972         4510 ,
 973         4520 ,
 974         4530 ,
 975         4540 ,
 976         4550 ,
 977         4560 ,
 978         4570 ,
 979         4580 ,
 980         4590 ,
 981         4600 ,
 982 };
 983
 984 static int ab8500_voltage_to_regval(int voltage)
 985 {
 986         int i;
 987
 988         /* Special case for voltage below 3.5V */
 989         if (voltage < ab8500_charger_voltage_map[0])
 990                 return LOW_VOLT_REG;
 991
 992         for (i = 1; i < ARRAY_SIZE(ab8500_charger_voltage_map); i++) {
 993                 if (voltage < ab8500_charger_voltage_map[i])
 994                         return i - 1;
 995         }
 996
 997         /* If not last element, return error */
 998         i = ARRAY_SIZE(ab8500_charger_voltage_map) - 1;
 999         if (voltage == ab8500_charger_voltage_map[i])
1000                 return i;
1001         else
1002                 return -1;
1003 }
1004
1005 static int ab8500_current_to_regval(struct ab8500_charger *di, int curr)
1006 {
1007         int i;
1008
1009         if (curr < di->bm->chg_output_curr[0])
1010                 return 0;
1011
1012         for (i = 0; i < di->bm->n_chg_out_curr; i++) {
1013                 if (curr < di->bm->chg_output_curr[i])
1014                         return i - 1;
1015         }
1016
1017         /* If not last element, return error */
1018         i = di->bm->n_chg_out_curr - 1;
1019         if (curr == di->bm->chg_output_curr[i])
1020                 return i;
1021         else
1022                 return -1;
1023 }
1024
1025 static int ab8500_vbus_in_curr_to_regval(struct ab8500_charger *di, int curr)
1026 {
1027         int i;
1028
1029         if (curr < di->bm->chg_input_curr[0])
1030                 return 0;
1031
1032         for (i = 0; i < di->bm->n_chg_in_curr; i++) {
1033                 if (curr < di->bm->chg_input_curr[i])
1034                         return i - 1;
1035         }
1036
1037         /* If not last element, return error */
1038         i = di->bm->n_chg_in_curr - 1;
1039         if (curr == di->bm->chg_input_curr[i])
1040                 return i;
1041         else
1042                 return -1;
1043 }
1044
1045 /**
1046  * ab8500_charger_get_usb_cur() - get usb current
1047  * @di:         pointer to the ab8500_charger structre
1048  *
1049  * The usb stack provides the maximum current that can be drawn from
1050  * the standard usb host. This will be in mA.
1051  * This function converts current in mA to a value that can be written
1052  * to the register. Returns -1 if charging is not allowed
1053  */
1054 static int ab8500_charger_get_usb_cur(struct ab8500_charger *di)
1055 {
1056         int ret = 0;
1057         switch (di->usb_state.usb_current) {
1058         case 100:
1059                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P09;
1060                 break;
1061         case 200:
1062                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P19;
1063                 break;
1064         case 300:
1065                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P29;
1066                 break;
1067         case 400:
1068                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P38;
1069                 break;
1070         case 500:
1071                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
1072                 break;
1073         default:
1074                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P05;
1075                 ret = -EPERM;
1076                 break;
1077         };
1078         di->max_usb_in_curr.set_max = di->max_usb_in_curr.usb_type_max;
1079         return ret;
1080 }
1081
1082 /**
1083  * ab8500_charger_check_continue_stepping() - Check to allow stepping
1084  * @di:         pointer to the ab8500_charger structure
1085  * @reg:        select what charger register to check
1086  *
1087  * Check if current stepping should be allowed to continue.
1088  * Checks if charger source has not collapsed. If it has, further stepping
1089  * is not allowed.
1090  */
1091 static bool ab8500_charger_check_continue_stepping(struct ab8500_charger *di,
1092                                                    int reg)
1093 {
1094         if (reg == AB8500_USBCH_IPT_CRNTLVL_REG)
1095                 return !di->flags.vbus_drop_end;
1096         else
1097                 return true;
1098 }
1099
1100 /**
1101  * ab8500_charger_set_current() - set charger current
1102  * @di:         pointer to the ab8500_charger structure
1103  * @ich:        charger current, in mA
1104  * @reg:        select what charger register to set
1105  *
1106  * Set charger current.
1107  * There is no state machine in the AB to step up/down the charger
1108  * current to avoid dips and spikes on MAIN, VBUS and VBAT when
1109  * charging is started. Instead we need to implement
1110  * this charger current step-up/down here.
1111  * Returns error code in case of failure else 0(on success)
1112  */
1113 static int ab8500_charger_set_current(struct ab8500_charger *di,
1114         int ich, int reg)
1115 {
1116         int ret = 0;
1117         int curr_index, prev_curr_index, shift_value, i;
1118         u8 reg_value;
1119         u32 step_udelay;
1120         bool no_stepping = false;
1121
1122         atomic_inc(&di->current_stepping_sessions);
1123
1124         ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
1125                 reg, &reg_value);
1126         if (ret < 0) {
1127                 dev_err(di->dev, "%s read failed\n", __func__);
1128                 goto exit_set_current;
1129         }
1130
1131         switch (reg) {
1132         case AB8500_MCH_IPT_CURLVL_REG:
1133                 shift_value = MAIN_CH_INPUT_CURR_SHIFT;
1134                 prev_curr_index = (reg_value >> shift_value);
1135                 curr_index = ab8500_current_to_regval(di, ich);
1136                 step_udelay = STEP_UDELAY;
1137                 if (!di->ac.charger_connected)
1138                         no_stepping = true;
1139                 break;
1140         case AB8500_USBCH_IPT_CRNTLVL_REG:
1141                 if (is_ab8540(di->parent))
1142                         shift_value = AB8540_VBUS_IN_CURR_LIM_SHIFT;
1143                 else
1144                         shift_value = VBUS_IN_CURR_LIM_SHIFT;
1145                 prev_curr_index = (reg_value >> shift_value);
1146                 curr_index = ab8500_vbus_in_curr_to_regval(di, ich);
1147                 step_udelay = STEP_UDELAY * 100;
1148
1149                 if (!di->usb.charger_connected)
1150                         no_stepping = true;
1151                 break;
1152         case AB8500_CH_OPT_CRNTLVL_REG:
1153                 shift_value = 0;
1154                 prev_curr_index = (reg_value >> shift_value);
1155                 curr_index = ab8500_current_to_regval(di, ich);
1156                 step_udelay = STEP_UDELAY;
1157                 if (curr_index && (curr_index - prev_curr_index) > 1)
1158                         step_udelay *= 100;
1159
1160                 if (!di->usb.charger_connected && !di->ac.charger_connected)
1161                         no_stepping = true;
1162
1163                 break;
1164         default:
1165                 dev_err(di->dev, "%s current register not valid\n", __func__);
1166                 ret = -ENXIO;
1167                 goto exit_set_current;
1168         }
1169
1170         if (curr_index < 0) {
1171                 dev_err(di->dev, "requested current limit out-of-range\n");
1172                 ret = -ENXIO;
1173                 goto exit_set_current;
1174         }
1175
1176         /* only update current if it's been changed */
1177         if (prev_curr_index == curr_index) {
1178                 dev_dbg(di->dev, "%s current not changed for reg: 0x%02x\n",
1179                         __func__, reg);
1180                 ret = 0;
1181                 goto exit_set_current;
1182         }
1183
1184         dev_dbg(di->dev, "%s set charger current: %d mA for reg: 0x%02x\n",
1185                 __func__, ich, reg);
1186
1187         if (no_stepping) {
1188                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1189                                         reg, (u8)curr_index << shift_value);
1190                 if (ret)
1191                         dev_err(di->dev, "%s write failed\n", __func__);
1192         } else if (prev_curr_index > curr_index) {
1193                 for (i = prev_curr_index - 1; i >= curr_index; i--) {
1194                         dev_dbg(di->dev, "curr change_1 to: %x for 0x%02x\n",
1195                                 (u8) i << shift_value, reg);
1196                         ret = abx500_set_register_interruptible(di->dev,
1197                                 AB8500_CHARGER, reg, (u8)i << shift_value);
1198                         if (ret) {
1199                                 dev_err(di->dev, "%s write failed\n", __func__);
1200                                 goto exit_set_current;
1201                         }
1202                         if (i != curr_index)
1203                                 usleep_range(step_udelay, step_udelay * 2);
1204                 }
1205         } else {
1206                 bool allow = true;
1207                 for (i = prev_curr_index + 1; i <= curr_index && allow; i++) {
1208                         dev_dbg(di->dev, "curr change_2 to: %x for 0x%02x\n",
1209                                 (u8)i << shift_value, reg);
1210                         ret = abx500_set_register_interruptible(di->dev,
1211                                 AB8500_CHARGER, reg, (u8)i << shift_value);
1212                         if (ret) {
1213                                 dev_err(di->dev, "%s write failed\n", __func__);
1214                                 goto exit_set_current;
1215                         }
1216                         if (i != curr_index)
1217                                 usleep_range(step_udelay, step_udelay * 2);
1218
1219                         allow = ab8500_charger_check_continue_stepping(di, reg);
1220                 }
1221         }
1222
1223 exit_set_current:
1224         atomic_dec(&di->current_stepping_sessions);
1225
1226         return ret;
1227 }
1228
1229 /**
1230  * ab8500_charger_set_vbus_in_curr() - set VBUS input current limit
1231  * @di:         pointer to the ab8500_charger structure
1232  * @ich_in:     charger input current limit
1233  *
1234  * Sets the current that can be drawn from the USB host
1235  * Returns error code in case of failure else 0(on success)
1236  */
1237 static int ab8500_charger_set_vbus_in_curr(struct ab8500_charger *di,
1238                 int ich_in)
1239 {
1240         int min_value;
1241         int ret;
1242
1243         /* We should always use to lowest current limit */
1244         min_value = min(di->bm->chg_params->usb_curr_max, ich_in);
1245         if (di->max_usb_in_curr.set_max > 0)
1246                 min_value = min(di->max_usb_in_curr.set_max, min_value);
1247
1248         if (di->usb_state.usb_current >= 0)
1249                 min_value = min(di->usb_state.usb_current, min_value);
1250
1251         switch (min_value) {
1252         case 100:
1253                 if (di->vbat < VBAT_TRESH_IP_CUR_RED)
1254                         min_value = USB_CH_IP_CUR_LVL_0P05;
1255                 break;
1256         case 500:
1257                 if (di->vbat < VBAT_TRESH_IP_CUR_RED)
1258                         min_value = USB_CH_IP_CUR_LVL_0P45;
1259                 break;
1260         default:
1261                 break;
1262         }
1263
1264         dev_info(di->dev, "VBUS input current limit set to %d mA\n", min_value);
1265
1266         mutex_lock(&di->usb_ipt_crnt_lock);
1267         ret = ab8500_charger_set_current(di, min_value,
1268                 AB8500_USBCH_IPT_CRNTLVL_REG);
1269         mutex_unlock(&di->usb_ipt_crnt_lock);
1270
1271         return ret;
1272 }
1273
1274 /**
1275  * ab8500_charger_set_main_in_curr() - set main charger input current
1276  * @di:         pointer to the ab8500_charger structure
1277  * @ich_in:     input charger current, in mA
1278  *
1279  * Set main charger input current.
1280  * Returns error code in case of failure else 0(on success)
1281  */
1282 static int ab8500_charger_set_main_in_curr(struct ab8500_charger *di,
1283         int ich_in)
1284 {
1285         return ab8500_charger_set_current(di, ich_in,
1286                 AB8500_MCH_IPT_CURLVL_REG);
1287 }
1288
1289 /**
1290  * ab8500_charger_set_output_curr() - set charger output current
1291  * @di:         pointer to the ab8500_charger structure
1292  * @ich_out:    output charger current, in mA
1293  *
1294  * Set charger output current.
1295  * Returns error code in case of failure else 0(on success)
1296  */
1297 static int ab8500_charger_set_output_curr(struct ab8500_charger *di,
1298         int ich_out)
1299 {
1300         return ab8500_charger_set_current(di, ich_out,
1301                 AB8500_CH_OPT_CRNTLVL_REG);
1302 }
1303
1304 /**
1305  * ab8500_charger_led_en() - turn on/off chargign led
1306  * @di:         pointer to the ab8500_charger structure
1307  * @on:         flag to turn on/off the chargign led
1308  *
1309  * Power ON/OFF charging LED indication
1310  * Returns error code in case of failure else 0(on success)
1311  */
1312 static int ab8500_charger_led_en(struct ab8500_charger *di, int on)
1313 {
1314         int ret;
1315
1316         if (on) {
1317                 /* Power ON charging LED indicator, set LED current to 5mA */
1318                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1319                         AB8500_LED_INDICATOR_PWM_CTRL,
1320                         (LED_IND_CUR_5MA | LED_INDICATOR_PWM_ENA));
1321                 if (ret) {
1322                         dev_err(di->dev, "Power ON LED failed\n");
1323                         return ret;
1324                 }
1325                 /* LED indicator PWM duty cycle 252/256 */
1326                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1327                         AB8500_LED_INDICATOR_PWM_DUTY,
1328                         LED_INDICATOR_PWM_DUTY_252_256);
1329                 if (ret) {
1330                         dev_err(di->dev, "Set LED PWM duty cycle failed\n");
1331                         return ret;
1332                 }
1333         } else {
1334                 /* Power off charging LED indicator */
1335                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1336                         AB8500_LED_INDICATOR_PWM_CTRL,
1337                         LED_INDICATOR_PWM_DIS);
1338                 if (ret) {
1339                         dev_err(di->dev, "Power-off LED failed\n");
1340                         return ret;
1341                 }
1342         }
1343
1344         return ret;
1345 }
1346
1347 /**
1348  * ab8500_charger_ac_en() - enable or disable ac charging
1349  * @di:         pointer to the ab8500_charger structure
1350  * @enable:     enable/disable flag
1351  * @vset:       charging voltage
1352  * @iset:       charging current
1353  *
1354  * Enable/Disable AC/Mains charging and turns on/off the charging led
1355  * respectively.
1356  **/
1357 static int ab8500_charger_ac_en(struct ux500_charger *charger,
1358         int enable, int vset, int iset)
1359 {
1360         int ret;
1361         int volt_index;
1362         int curr_index;
1363         int input_curr_index;
1364         u8 overshoot = 0;
1365
1366         struct ab8500_charger *di = to_ab8500_charger_ac_device_info(charger);
1367
1368         if (enable) {
1369                 /* Check if AC is connected */
1370                 if (!di->ac.charger_connected) {
1371                         dev_err(di->dev, "AC charger not connected\n");
1372                         return -ENXIO;
1373                 }
1374
1375                 /* Enable AC charging */
1376                 dev_dbg(di->dev, "Enable AC: %dmV %dmA\n", vset, iset);
1377
1378                 /*
1379                  * Due to a bug in AB8500, BTEMP_HIGH/LOW interrupts
1380                  * will be triggered everytime we enable the VDD ADC supply.
1381                  * This will turn off charging for a short while.
1382                  * It can be avoided by having the supply on when
1383                  * there is a charger enabled. Normally the VDD ADC supply
1384                  * is enabled everytime a GPADC conversion is triggered. We will
1385                  * force it to be enabled from this driver to have
1386                  * the GPADC module independant of the AB8500 chargers
1387                  */
1388                 if (!di->vddadc_en_ac) {
1389                         regulator_enable(di->regu);
1390                         di->vddadc_en_ac = true;
1391                 }
1392
1393                 /* Check if the requested voltage or current is valid */
1394                 volt_index = ab8500_voltage_to_regval(vset);
1395                 curr_index = ab8500_current_to_regval(di, iset);
1396                 input_curr_index = ab8500_current_to_regval(di,
1397                         di->bm->chg_params->ac_curr_max);
1398                 if (volt_index < 0 || curr_index < 0 || input_curr_index < 0) {
1399                         dev_err(di->dev,
1400                                 "Charger voltage or current too high, "
1401                                 "charging not started\n");
1402                         return -ENXIO;
1403                 }
1404
1405                 /* ChVoltLevel: maximum battery charging voltage */
1406                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1407                         AB8500_CH_VOLT_LVL_REG, (u8) volt_index);
1408                 if (ret) {
1409                         dev_err(di->dev, "%s write failed\n", __func__);
1410                         return ret;
1411                 }
1412                 /* MainChInputCurr: current that can be drawn from the charger*/
1413                 ret = ab8500_charger_set_main_in_curr(di,
1414                         di->bm->chg_params->ac_curr_max);
1415                 if (ret) {
1416                         dev_err(di->dev, "%s Failed to set MainChInputCurr\n",
1417                                 __func__);
1418                         return ret;
1419                 }
1420                 /* ChOutputCurentLevel: protected output current */
1421                 ret = ab8500_charger_set_output_curr(di, iset);
1422                 if (ret) {
1423                         dev_err(di->dev, "%s "
1424                                 "Failed to set ChOutputCurentLevel\n",
1425                                 __func__);
1426                         return ret;
1427                 }
1428
1429                 /* Check if VBAT overshoot control should be enabled */
1430                 if (!di->bm->enable_overshoot)
1431                         overshoot = MAIN_CH_NO_OVERSHOOT_ENA_N;
1432
1433                 /* Enable Main Charger */
1434                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1435                         AB8500_MCH_CTRL1, MAIN_CH_ENA | overshoot);
1436                 if (ret) {
1437                         dev_err(di->dev, "%s write failed\n", __func__);
1438                         return ret;
1439                 }
1440
1441                 /* Power on charging LED indication */
1442                 ret = ab8500_charger_led_en(di, true);
1443                 if (ret < 0)
1444                         dev_err(di->dev, "failed to enable LED\n");
1445
1446                 di->ac.charger_online = 1;
1447         } else {
1448                 /* Disable AC charging */
1449                 if (is_ab8500_1p1_or_earlier(di->parent)) {
1450                         /*
1451                          * For ABB revision 1.0 and 1.1 there is a bug in the
1452                          * watchdog logic. That means we have to continously
1453                          * kick the charger watchdog even when no charger is
1454                          * connected. This is only valid once the AC charger
1455                          * has been enabled. This is a bug that is not handled
1456                          * by the algorithm and the watchdog have to be kicked
1457                          * by the charger driver when the AC charger
1458                          * is disabled
1459                          */
1460                         if (di->ac_conn) {
1461                                 queue_delayed_work(di->charger_wq,
1462                                         &di->kick_wd_work,
1463                                         round_jiffies(WD_KICK_INTERVAL));
1464                         }
1465
1466                         /*
1467                          * We can't turn off charging completely
1468                          * due to a bug in AB8500 cut1.
1469                          * If we do, charging will not start again.
1470                          * That is why we set the lowest voltage
1471                          * and current possible
1472                          */
1473                         ret = abx500_set_register_interruptible(di->dev,
1474                                 AB8500_CHARGER,
1475                                 AB8500_CH_VOLT_LVL_REG, CH_VOL_LVL_3P5);
1476                         if (ret) {
1477                                 dev_err(di->dev,
1478                                         "%s write failed\n", __func__);
1479                                 return ret;
1480                         }
1481
1482                         ret = ab8500_charger_set_output_curr(di, 0);
1483                         if (ret) {
1484                                 dev_err(di->dev, "%s "
1485                                         "Failed to set ChOutputCurentLevel\n",
1486                                         __func__);
1487                                 return ret;
1488                         }
1489                 } else {
1490                         ret = abx500_set_register_interruptible(di->dev,
1491                                 AB8500_CHARGER,
1492                                 AB8500_MCH_CTRL1, 0);
1493                         if (ret) {
1494                                 dev_err(di->dev,
1495                                         "%s write failed\n", __func__);
1496                                 return ret;
1497                         }
1498                 }
1499
1500                 ret = ab8500_charger_led_en(di, false);
1501                 if (ret < 0)
1502                         dev_err(di->dev, "failed to disable LED\n");
1503
1504                 di->ac.charger_online = 0;
1505                 di->ac.wd_expired = false;
1506
1507                 /* Disable regulator if enabled */
1508                 if (di->vddadc_en_ac) {
1509                         regulator_disable(di->regu);
1510                         di->vddadc_en_ac = false;
1511                 }
1512
1513                 dev_dbg(di->dev, "%s Disabled AC charging\n", __func__);
1514         }
1515         ab8500_power_supply_changed(di, &di->ac_chg.psy);
1516
1517         return ret;
1518 }
1519
1520 /**
1521  * ab8500_charger_usb_en() - enable usb charging
1522  * @di:         pointer to the ab8500_charger structure
1523  * @enable:     enable/disable flag
1524  * @vset:       charging voltage
1525  * @ich_out:    charger output current
1526  *
1527  * Enable/Disable USB charging and turns on/off the charging led respectively.
1528  * Returns error code in case of failure else 0(on success)
1529  */
1530 static int ab8500_charger_usb_en(struct ux500_charger *charger,
1531         int enable, int vset, int ich_out)
1532 {
1533         int ret;
1534         int volt_index;
1535         int curr_index;
1536         u8 overshoot = 0;
1537
1538         struct ab8500_charger *di = to_ab8500_charger_usb_device_info(charger);
1539
1540         if (enable) {
1541                 /* Check if USB is connected */
1542                 if (!di->usb.charger_connected) {
1543                         dev_err(di->dev, "USB charger not connected\n");
1544                         return -ENXIO;
1545                 }
1546
1547                 /*
1548                  * Due to a bug in AB8500, BTEMP_HIGH/LOW interrupts
1549                  * will be triggered everytime we enable the VDD ADC supply.
1550                  * This will turn off charging for a short while.
1551                  * It can be avoided by having the supply on when
1552                  * there is a charger enabled. Normally the VDD ADC supply
1553                  * is enabled everytime a GPADC conversion is triggered. We will
1554                  * force it to be enabled from this driver to have
1555                  * the GPADC module independant of the AB8500 chargers
1556                  */
1557                 if (!di->vddadc_en_usb) {
1558                         regulator_enable(di->regu);
1559                         di->vddadc_en_usb = true;
1560                 }
1561
1562                 /* Enable USB charging */
1563                 dev_dbg(di->dev, "Enable USB: %dmV %dmA\n", vset, ich_out);
1564
1565                 /* Check if the requested voltage or current is valid */
1566                 volt_index = ab8500_voltage_to_regval(vset);
1567                 curr_index = ab8500_current_to_regval(di, ich_out);
1568                 if (volt_index < 0 || curr_index < 0) {
1569                         dev_err(di->dev,
1570                                 "Charger voltage or current too high, "
1571                                 "charging not started\n");
1572                         return -ENXIO;
1573                 }
1574
1575                 /* ChVoltLevel: max voltage upto which battery can be charged */
1576                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1577                         AB8500_CH_VOLT_LVL_REG, (u8) volt_index);
1578                 if (ret) {
1579                         dev_err(di->dev, "%s write failed\n", __func__);
1580                         return ret;
1581                 }
1582                 /* Check if VBAT overshoot control should be enabled */
1583                 if (!di->bm->enable_overshoot)
1584                         overshoot = USB_CHG_NO_OVERSHOOT_ENA_N;
1585
1586                 /* Enable USB Charger */
1587                 dev_dbg(di->dev,
1588                         "Enabling USB with write to AB8500_USBCH_CTRL1_REG\n");
1589                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1590                         AB8500_USBCH_CTRL1_REG, USB_CH_ENA | overshoot);
1591                 if (ret) {
1592                         dev_err(di->dev, "%s write failed\n", __func__);
1593                         return ret;
1594                 }
1595
1596                 /* If success power on charging LED indication */
1597                 ret = ab8500_charger_led_en(di, true);
1598                 if (ret < 0)
1599                         dev_err(di->dev, "failed to enable LED\n");
1600
1601                 di->usb.charger_online = 1;
1602
1603                 /* USBChInputCurr: current that can be drawn from the usb */
1604                 ret = ab8500_charger_set_vbus_in_curr(di,
1605                                         di->max_usb_in_curr.usb_type_max);
1606                 if (ret) {
1607                         dev_err(di->dev, "setting USBChInputCurr failed\n");
1608                         return ret;
1609                 }
1610
1611                 /* ChOutputCurentLevel: protected output current */
1612                 ret = ab8500_charger_set_output_curr(di, ich_out);
1613                 if (ret) {
1614                         dev_err(di->dev, "%s "
1615                                 "Failed to set ChOutputCurentLevel\n",
1616                                 __func__);
1617                         return ret;
1618                 }
1619
1620                 queue_delayed_work(di->charger_wq, &di->check_vbat_work, HZ);
1621
1622         } else {
1623                 /* Disable USB charging */
1624                 dev_dbg(di->dev, "%s Disabled USB charging\n", __func__);
1625                 ret = abx500_set_register_interruptible(di->dev,
1626                         AB8500_CHARGER,
1627                         AB8500_USBCH_CTRL1_REG, 0);
1628                 if (ret) {
1629                         dev_err(di->dev,
1630                                 "%s write failed\n", __func__);
1631                         return ret;
1632                 }
1633
1634                 ret = ab8500_charger_led_en(di, false);
1635                 if (ret < 0)
1636                         dev_err(di->dev, "failed to disable LED\n");
1637                 /* USBChInputCurr: current that can be drawn from the usb */
1638                 ret = ab8500_charger_set_vbus_in_curr(di, 0);
1639                 if (ret) {
1640                         dev_err(di->dev, "setting USBChInputCurr failed\n");
1641                         return ret;
1642                 }
1643
1644                 /* ChOutputCurentLevel: protected output current */
1645                 ret = ab8500_charger_set_output_curr(di, 0);
1646                 if (ret) {
1647                         dev_err(di->dev, "%s "
1648                                 "Failed to reset ChOutputCurentLevel\n",
1649                                 __func__);
1650                         return ret;
1651                 }
1652                 di->usb.charger_online = 0;
1653                 di->usb.wd_expired = false;
1654
1655                 /* Disable regulator if enabled */
1656                 if (di->vddadc_en_usb) {
1657                         regulator_disable(di->regu);
1658                         di->vddadc_en_usb = false;
1659                 }
1660
1661                 dev_dbg(di->dev, "%s Disabled USB charging\n", __func__);
1662
1663                 /* Cancel any pending Vbat check work */
1664                 cancel_delayed_work(&di->check_vbat_work);
1665
1666         }
1667         ab8500_power_supply_changed(di, &di->usb_chg.psy);
1668
1669         return ret;
1670 }
1671
1672 static int ab8500_external_charger_prepare(struct notifier_block *charger_nb,
1673                                 unsigned long event, void *data)
1674 {
1675         int ret;
1676         struct device *dev = data;
1677         /*Toggle External charger control pin*/
1678         ret = abx500_set_register_interruptible(dev, AB8500_SYS_CTRL1_BLOCK,
1679                                   AB8500_SYS_CHARGER_CONTROL_REG,
1680                                   EXTERNAL_CHARGER_DISABLE_REG_VAL);
1681         if (ret < 0) {
1682                 dev_err(dev, "write reg failed %d\n", ret);
1683                 goto out;
1684         }
1685         ret = abx500_set_register_interruptible(dev, AB8500_SYS_CTRL1_BLOCK,
1686                                   AB8500_SYS_CHARGER_CONTROL_REG,
1687                                   EXTERNAL_CHARGER_ENABLE_REG_VAL);
1688         if (ret < 0)
1689                 dev_err(dev, "Write reg failed %d\n", ret);
1690
1691 out:
1692         return ret;
1693 }
1694
1695 /**
1696  * ab8500_charger_usb_check_enable() - enable usb charging
1697  * @charger:    pointer to the ux500_charger structure
1698  * @vset:       charging voltage
1699  * @iset:       charger output current
1700  *
1701  * Check if the VBUS charger has been disconnected and reconnected without
1702  * AB8500 rising an interrupt. Returns 0 on success.
1703  */
1704 static int ab8500_charger_usb_check_enable(struct ux500_charger *charger,
1705         int vset, int iset)
1706 {
1707         u8 usbch_ctrl1 = 0;
1708         int ret = 0;
1709
1710         struct ab8500_charger *di = to_ab8500_charger_usb_device_info(charger);
1711
1712         if (!di->usb.charger_connected)
1713                 return ret;
1714
1715         ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
1716                                 AB8500_USBCH_CTRL1_REG, &usbch_ctrl1);
1717         if (ret < 0) {
1718                 dev_err(di->dev, "ab8500 read failed %d\n", __LINE__);
1719                 return ret;
1720         }
1721         dev_dbg(di->dev, "USB charger ctrl: 0x%02x\n", usbch_ctrl1);
1722
1723         if (!(usbch_ctrl1 & USB_CH_ENA)) {
1724                 dev_info(di->dev, "Charging has been disabled abnormally and will be re-enabled\n");
1725
1726                 ret = abx500_mask_and_set_register_interruptible(di->dev,
1727                                         AB8500_CHARGER, AB8500_CHARGER_CTRL,
1728                                         DROP_COUNT_RESET, DROP_COUNT_RESET);
1729                 if (ret < 0) {
1730                         dev_err(di->dev, "ab8500 write failed %d\n", __LINE__);
1731                         return ret;
1732                 }
1733
1734                 ret = ab8500_charger_usb_en(&di->usb_chg, true, vset, iset);
1735                 if (ret < 0) {
1736                         dev_err(di->dev, "Failed to enable VBUS charger %d\n",
1737                                         __LINE__);
1738                         return ret;
1739                 }
1740         }
1741         return ret;
1742 }
1743
1744 /**
1745  * ab8500_charger_ac_check_enable() - enable usb charging
1746  * @charger:    pointer to the ux500_charger structure
1747  * @vset:       charging voltage
1748  * @iset:       charger output current
1749  *
1750  * Check if the AC charger has been disconnected and reconnected without
1751  * AB8500 rising an interrupt. Returns 0 on success.
1752  */
1753 static int ab8500_charger_ac_check_enable(struct ux500_charger *charger,
1754         int vset, int iset)
1755 {
1756         u8 mainch_ctrl1 = 0;
1757         int ret = 0;
1758
1759         struct ab8500_charger *di = to_ab8500_charger_ac_device_info(charger);
1760
1761         if (!di->ac.charger_connected)
1762                 return ret;
1763
1764         ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
1765                                 AB8500_MCH_CTRL1, &mainch_ctrl1);
1766         if (ret < 0) {
1767                 dev_err(di->dev, "ab8500 read failed %d\n", __LINE__);
1768                 return ret;
1769         }
1770         dev_dbg(di->dev, "AC charger ctrl: 0x%02x\n", mainch_ctrl1);
1771
1772         if (!(mainch_ctrl1 & MAIN_CH_ENA)) {
1773                 dev_info(di->dev, "Charging has been disabled abnormally and will be re-enabled\n");
1774
1775                 ret = abx500_mask_and_set_register_interruptible(di->dev,
1776                                         AB8500_CHARGER, AB8500_CHARGER_CTRL,
1777                                         DROP_COUNT_RESET, DROP_COUNT_RESET);
1778
1779                 if (ret < 0) {
1780                         dev_err(di->dev, "ab8500 write failed %d\n", __LINE__);
1781                         return ret;
1782                 }
1783
1784                 ret = ab8500_charger_ac_en(&di->usb_chg, true, vset, iset);
1785                 if (ret < 0) {
1786                         dev_err(di->dev, "failed to enable AC charger %d\n",
1787                                 __LINE__);
1788                         return ret;
1789                 }
1790         }
1791         return ret;
1792 }
1793
1794 /**
1795  * ab8500_charger_watchdog_kick() - kick charger watchdog
1796  * @di:         pointer to the ab8500_charger structure
1797  *
1798  * Kick charger watchdog
1799  * Returns error code in case of failure else 0(on success)
1800  */
1801 static int ab8500_charger_watchdog_kick(struct ux500_charger *charger)
1802 {
1803         int ret;
1804         struct ab8500_charger *di;
1805
1806         if (charger->psy.type == POWER_SUPPLY_TYPE_MAINS)
1807                 di = to_ab8500_charger_ac_device_info(charger);
1808         else if (charger->psy.type == POWER_SUPPLY_TYPE_USB)
1809                 di = to_ab8500_charger_usb_device_info(charger);
1810         else
1811                 return -ENXIO;
1812
1813         ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1814                 AB8500_CHARG_WD_CTRL, CHARG_WD_KICK);
1815         if (ret)
1816                 dev_err(di->dev, "Failed to kick WD!\n");
1817
1818         return ret;
1819 }
1820
1821 /**
1822  * ab8500_charger_update_charger_current() - update charger current
1823  * @di:         pointer to the ab8500_charger structure
1824  *
1825  * Update the charger output current for the specified charger
1826  * Returns error code in case of failure else 0(on success)
1827  */
1828 static int ab8500_charger_update_charger_current(struct ux500_charger *charger,
1829                 int ich_out)
1830 {
1831         int ret;
1832         struct ab8500_charger *di;
1833
1834         if (charger->psy.type == POWER_SUPPLY_TYPE_MAINS)
1835                 di = to_ab8500_charger_ac_device_info(charger);
1836         else if (charger->psy.type == POWER_SUPPLY_TYPE_USB)
1837                 di = to_ab8500_charger_usb_device_info(charger);
1838         else
1839                 return -ENXIO;
1840
1841         ret = ab8500_charger_set_output_curr(di, ich_out);
1842         if (ret) {
1843                 dev_err(di->dev, "%s "
1844                         "Failed to set ChOutputCurentLevel\n",
1845                         __func__);
1846                 return ret;
1847         }
1848
1849         /* Reset the main and usb drop input current measurement counter */
1850         ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1851                                 AB8500_CHARGER_CTRL, DROP_COUNT_RESET);
1852         if (ret) {
1853                 dev_err(di->dev, "%s write failed\n", __func__);
1854                 return ret;
1855         }
1856
1857         return ret;
1858 }
1859
1860 /**
1861  * ab8540_charger_power_path_enable() - enable usb power path mode
1862  * @charger:    pointer to the ux500_charger structure
1863  * @enable:     enable/disable flag
1864  *
1865  * Enable or disable the power path for usb mode
1866  * Returns error code in case of failure else 0(on success)
1867  */
1868 static int ab8540_charger_power_path_enable(struct ux500_charger *charger,
1869                 bool enable)
1870 {
1871         int ret;
1872         struct ab8500_charger *di;
1873
1874         if (charger->psy.type == POWER_SUPPLY_TYPE_USB)
1875                 di = to_ab8500_charger_usb_device_info(charger);
1876         else
1877                 return -ENXIO;
1878
1879         ret = abx500_mask_and_set_register_interruptible(di->dev,
1880                                 AB8500_CHARGER, AB8540_USB_PP_MODE_REG,
1881                                 BUS_POWER_PATH_MODE_ENA, enable);
1882         if (ret) {
1883                 dev_err(di->dev, "%s write failed\n", __func__);
1884                 return ret;
1885         }
1886
1887         return ret;
1888 }
1889
1890
1891 /**
1892  * ab8540_charger_usb_pre_chg_enable() - enable usb pre change
1893  * @charger:    pointer to the ux500_charger structure
1894  * @enable:     enable/disable flag
1895  *
1896  * Enable or disable the pre-chage for usb mode
1897  * Returns error code in case of failure else 0(on success)
1898  */
1899 static int ab8540_charger_usb_pre_chg_enable(struct ux500_charger *charger,
1900                 bool enable)
1901 {
1902         int ret;
1903         struct ab8500_charger *di;
1904
1905         if (charger->psy.type == POWER_SUPPLY_TYPE_USB)
1906                 di = to_ab8500_charger_usb_device_info(charger);
1907         else
1908                 return -ENXIO;
1909
1910         ret = abx500_mask_and_set_register_interruptible(di->dev,
1911                                 AB8500_CHARGER, AB8540_USB_PP_CHR_REG,
1912                                 BUS_POWER_PATH_PRECHG_ENA, enable);
1913         if (ret) {
1914                 dev_err(di->dev, "%s write failed\n", __func__);
1915                 return ret;
1916         }
1917
1918         return ret;
1919 }
1920
1921 static int ab8500_charger_get_ext_psy_data(struct device *dev, void *data)
1922 {
1923         struct power_supply *psy;
1924         struct power_supply *ext;
1925         struct ab8500_charger *di;
1926         union power_supply_propval ret;
1927         int i, j;
1928         bool psy_found = false;
1929         struct ux500_charger *usb_chg;
1930
1931         usb_chg = (struct ux500_charger *)data;
1932         psy = &usb_chg->psy;
1933
1934         di = to_ab8500_charger_usb_device_info(usb_chg);
1935
1936         ext = dev_get_drvdata(dev);
1937
1938         /* For all psy where the driver name appears in any supplied_to */
1939         for (i = 0; i < ext->num_supplicants; i++) {
1940                 if (!strcmp(ext->supplied_to[i], psy->name))
1941                         psy_found = true;
1942         }
1943
1944         if (!psy_found)
1945                 return 0;
1946
1947         /* Go through all properties for the psy */
1948         for (j = 0; j < ext->num_properties; j++) {
1949                 enum power_supply_property prop;
1950                 prop = ext->properties[j];
1951
1952                 if (ext->get_property(ext, prop, &ret))
1953                         continue;
1954
1955                 switch (prop) {
1956                 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
1957                         switch (ext->type) {
1958                         case POWER_SUPPLY_TYPE_BATTERY:
1959                                 di->vbat = ret.intval / 1000;
1960                                 break;
1961                         default:
1962                                 break;
1963                         }
1964                         break;
1965                 default:
1966                         break;
1967                 }
1968         }
1969         return 0;
1970 }
1971
1972 /**
1973  * ab8500_charger_check_vbat_work() - keep vbus current within spec
1974  * @work        pointer to the work_struct structure
1975  *
1976  * Due to a asic bug it is necessary to lower the input current to the vbus
1977  * charger when charging with at some specific levels. This issue is only valid
1978  * for below a certain battery voltage. This function makes sure that the
1979  * the allowed current limit isn't exceeded.
1980  */
1981 static void ab8500_charger_check_vbat_work(struct work_struct *work)
1982 {
1983         int t = 10;
1984         struct ab8500_charger *di = container_of(work,
1985                 struct ab8500_charger, check_vbat_work.work);
1986
1987         class_for_each_device(power_supply_class, NULL,
1988                 &di->usb_chg.psy, ab8500_charger_get_ext_psy_data);
1989
1990         /* First run old_vbat is 0. */
1991         if (di->old_vbat == 0)
1992                 di->old_vbat = di->vbat;
1993
1994         if (!((di->old_vbat <= VBAT_TRESH_IP_CUR_RED &&
1995                 di->vbat <= VBAT_TRESH_IP_CUR_RED) ||
1996                 (di->old_vbat > VBAT_TRESH_IP_CUR_RED &&
1997                 di->vbat > VBAT_TRESH_IP_CUR_RED))) {
1998
1999                 dev_dbg(di->dev, "Vbat did cross threshold, curr: %d, new: %d,"
2000                         " old: %d\n", di->max_usb_in_curr.usb_type_max,
2001                         di->vbat, di->old_vbat);
2002                 ab8500_charger_set_vbus_in_curr(di,
2003                                         di->max_usb_in_curr.usb_type_max);
2004                 power_supply_changed(&di->usb_chg.psy);
2005         }
2006
2007         di->old_vbat = di->vbat;
2008
2009         /*
2010          * No need to check the battery voltage every second when not close to
2011          * the threshold.
2012          */
2013         if (di->vbat < (VBAT_TRESH_IP_CUR_RED + 100) &&
2014                 (di->vbat > (VBAT_TRESH_IP_CUR_RED - 100)))
2015                         t = 1;
2016
2017         queue_delayed_work(di->charger_wq, &di->check_vbat_work, t * HZ);
2018 }
2019
2020 /**
2021  * ab8500_charger_check_hw_failure_work() - check main charger failure
2022  * @work:       pointer to the work_struct structure
2023  *
2024  * Work queue function for checking the main charger status
2025  */
2026 static void ab8500_charger_check_hw_failure_work(struct work_struct *work)
2027 {
2028         int ret;
2029         u8 reg_value;
2030
2031         struct ab8500_charger *di = container_of(work,
2032                 struct ab8500_charger, check_hw_failure_work.work);
2033
2034         /* Check if the status bits for HW failure is still active */
2035         if (di->flags.mainextchnotok) {
2036                 ret = abx500_get_register_interruptible(di->dev,
2037                         AB8500_CHARGER, AB8500_CH_STATUS2_REG, &reg_value);
2038                 if (ret < 0) {
2039                         dev_err(di->dev, "%s ab8500 read failed\n", __func__);
2040                         return;
2041                 }
2042                 if (!(reg_value & MAIN_CH_NOK)) {
2043                         di->flags.mainextchnotok = false;
2044                         ab8500_power_supply_changed(di, &di->ac_chg.psy);
2045                 }
2046         }
2047         if (di->flags.vbus_ovv) {
2048                 ret = abx500_get_register_interruptible(di->dev,
2049                         AB8500_CHARGER, AB8500_CH_USBCH_STAT2_REG,
2050                         &reg_value);
2051                 if (ret < 0) {
2052                         dev_err(di->dev, "%s ab8500 read failed\n", __func__);
2053                         return;
2054                 }
2055                 if (!(reg_value & VBUS_OVV_TH)) {
2056                         di->flags.vbus_ovv = false;
2057                         ab8500_power_supply_changed(di, &di->usb_chg.psy);
2058                 }
2059         }
2060         /* If we still have a failure, schedule a new check */
2061         if (di->flags.mainextchnotok || di->flags.vbus_ovv) {
2062                 queue_delayed_work(di->charger_wq,
2063                         &di->check_hw_failure_work, round_jiffies(HZ));
2064         }
2065 }
2066
2067 /**
2068  * ab8500_charger_kick_watchdog_work() - kick the watchdog
2069  * @work:       pointer to the work_struct structure
2070  *
2071  * Work queue function for kicking the charger watchdog.
2072  *
2073  * For ABB revision 1.0 and 1.1 there is a bug in the watchdog
2074  * logic. That means we have to continously kick the charger
2075  * watchdog even when no charger is connected. This is only
2076  * valid once the AC charger has been enabled. This is
2077  * a bug that is not handled by the algorithm and the
2078  * watchdog have to be kicked by the charger driver
2079  * when the AC charger is disabled
2080  */
2081 static void ab8500_charger_kick_watchdog_work(struct work_struct *work)
2082 {
2083         int ret;
2084
2085         struct ab8500_charger *di = container_of(work,
2086                 struct ab8500_charger, kick_wd_work.work);
2087
2088         ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
2089                 AB8500_CHARG_WD_CTRL, CHARG_WD_KICK);
2090         if (ret)
2091                 dev_err(di->dev, "Failed to kick WD!\n");
2092
2093         /* Schedule a new watchdog kick */
2094         queue_delayed_work(di->charger_wq,
2095                 &di->kick_wd_work, round_jiffies(WD_KICK_INTERVAL));
2096 }
2097
2098 /**
2099  * ab8500_charger_ac_work() - work to get and set main charger status
2100  * @work:       pointer to the work_struct structure
2101  *
2102  * Work queue function for checking the main charger status
2103  */
2104 static void ab8500_charger_ac_work(struct work_struct *work)
2105 {
2106         int ret;
2107
2108         struct ab8500_charger *di = container_of(work,
2109                 struct ab8500_charger, ac_work);
2110
2111         /*
2112          * Since we can't be sure that the events are received
2113          * synchronously, we have the check if the main charger is
2114          * connected by reading the status register
2115          */
2116         ret = ab8500_charger_detect_chargers(di, false);
2117         if (ret < 0)
2118                 return;
2119
2120         if (ret & AC_PW_CONN) {
2121                 di->ac.charger_connected = 1;
2122                 di->ac_conn = true;
2123         } else {
2124                 di->ac.charger_connected = 0;
2125         }
2126
2127         ab8500_power_supply_changed(di, &di->ac_chg.psy);
2128         sysfs_notify(&di->ac_chg.psy.dev->kobj, NULL, "present");
2129 }
2130
2131 static void ab8500_charger_usb_attached_work(struct work_struct *work)
2132 {
2133         struct ab8500_charger *di = container_of(work,
2134                                                  struct ab8500_charger,
2135                                                  usb_charger_attached_work.work);
2136         int usbch = (USB_CH_VBUSDROP | USB_CH_VBUSDETDBNC);
2137         int ret, i;
2138         u8 statval;
2139
2140         for (i = 0; i < 10; i++) {
2141                 ret = abx500_get_register_interruptible(di->dev,
2142                                                         AB8500_CHARGER,
2143                                                         AB8500_CH_USBCH_STAT1_REG,
2144                                                         &statval);
2145                 if (ret < 0) {
2146                         dev_err(di->dev, "ab8500 read failed %d\n", __LINE__);
2147                         goto reschedule;
2148                 }
2149                 if ((statval & usbch) != usbch)
2150                         goto reschedule;
2151
2152                 msleep(CHARGER_STATUS_POLL);
2153         }
2154
2155         ab8500_charger_usb_en(&di->usb_chg, 0, 0, 0);
2156
2157         mutex_lock(&di->charger_attached_mutex);
2158         mutex_unlock(&di->charger_attached_mutex);
2159
2160         return;
2161
2162 reschedule:
2163         queue_delayed_work(di->charger_wq,
2164                            &di->usb_charger_attached_work,
2165                            HZ);
2166 }
2167
2168 static void ab8500_charger_ac_attached_work(struct work_struct *work)
2169 {
2170
2171         struct ab8500_charger *di = container_of(work,
2172                                                  struct ab8500_charger,
2173                                                  ac_charger_attached_work.work);
2174         int mainch = (MAIN_CH_STATUS2_MAINCHGDROP |
2175                       MAIN_CH_STATUS2_MAINCHARGERDETDBNC);
2176         int ret, i;
2177         u8 statval;
2178
2179         for (i = 0; i < 10; i++) {
2180                 ret = abx500_get_register_interruptible(di->dev,
2181                                                         AB8500_CHARGER,
2182                                                         AB8500_CH_STATUS2_REG,
2183                                                         &statval);
2184                 if (ret < 0) {
2185                         dev_err(di->dev, "ab8500 read failed %d\n", __LINE__);
2186                         goto reschedule;
2187                 }
2188
2189                 if ((statval & mainch) != mainch)
2190                         goto reschedule;
2191
2192                 msleep(CHARGER_STATUS_POLL);
2193         }
2194
2195         ab8500_charger_ac_en(&di->ac_chg, 0, 0, 0);
2196         queue_work(di->charger_wq, &di->ac_work);
2197
2198         mutex_lock(&di->charger_attached_mutex);
2199         mutex_unlock(&di->charger_attached_mutex);
2200
2201         return;
2202
2203 reschedule:
2204         queue_delayed_work(di->charger_wq,
2205                            &di->ac_charger_attached_work,
2206                            HZ);
2207 }
2208
2209 /**
2210  * ab8500_charger_detect_usb_type_work() - work to detect USB type
2211  * @work:       Pointer to the work_struct structure
2212  *
2213  * Detect the type of USB plugged
2214  */
2215 static void ab8500_charger_detect_usb_type_work(struct work_struct *work)
2216 {
2217         int ret;
2218
2219         struct ab8500_charger *di = container_of(work,
2220                 struct ab8500_charger, detect_usb_type_work);
2221
2222         /*
2223          * Since we can't be sure that the events are received
2224          * synchronously, we have the check if is
2225          * connected by reading the status register
2226          */
2227         ret = ab8500_charger_detect_chargers(di, false);
2228         if (ret < 0)
2229                 return;
2230
2231         if (!(ret & USB_PW_CONN)) {
2232                 dev_dbg(di->dev, "%s di->vbus_detected = false\n", __func__);
2233                 di->vbus_detected = false;
2234                 ab8500_charger_set_usb_connected(di, false);
2235                 ab8500_power_supply_changed(di, &di->usb_chg.psy);
2236         } else {
2237                 dev_dbg(di->dev, "%s di->vbus_detected = true\n", __func__);
2238                 di->vbus_detected = true;
2239
2240                 if (is_ab8500_1p1_or_earlier(di->parent)) {
2241                         ret = ab8500_charger_detect_usb_type(di);
2242                         if (!ret) {
2243                                 ab8500_charger_set_usb_connected(di, true);
2244                                 ab8500_power_supply_changed(di,
2245                                                             &di->usb_chg.psy);
2246                         }
2247                 } else {
2248                         /*
2249                          * For ABB cut2.0 and onwards we have an IRQ,
2250                          * USB_LINK_STATUS that will be triggered when the USB
2251                          * link status changes. The exception is USB connected
2252                          * during startup. Then we don't get a
2253                          * USB_LINK_STATUS IRQ
2254                          */
2255                         if (di->vbus_detected_start) {
2256                                 di->vbus_detected_start = false;
2257                                 ret = ab8500_charger_detect_usb_type(di);
2258                                 if (!ret) {
2259                                         ab8500_charger_set_usb_connected(di,
2260                                                 true);
2261                                         ab8500_power_supply_changed(di,
2262                                                 &di->usb_chg.psy);
2263                                 }
2264                         }
2265                 }
2266         }
2267 }
2268
2269 /**
2270  * ab8500_charger_usb_link_attach_work() - work to detect USB type
2271  * @work:       pointer to the work_struct structure
2272  *
2273  * Detect the type of USB plugged
2274  */
2275 static void ab8500_charger_usb_link_attach_work(struct work_struct *work)
2276 {
2277         struct ab8500_charger *di =
2278                 container_of(work, struct ab8500_charger, attach_work.work);
2279         int ret;
2280
2281         /* Update maximum input current if USB enumeration is not detected */
2282         if (!di->usb.charger_online) {
2283                 ret = ab8500_charger_set_vbus_in_curr(di,
2284                                         di->max_usb_in_curr.usb_type_max);
2285                 if (ret)
2286                         return;
2287         }
2288
2289         ab8500_charger_set_usb_connected(di, true);
2290         ab8500_power_supply_changed(di, &di->usb_chg.psy);
2291 }
2292
2293 /**
2294  * ab8500_charger_usb_link_status_work() - work to detect USB type
2295  * @work:       pointer to the work_struct structure
2296  *
2297  * Detect the type of USB plugged
2298  */
2299 static void ab8500_charger_usb_link_status_work(struct work_struct *work)
2300 {
2301         int detected_chargers;
2302         int ret;
2303         u8 val;
2304         u8 link_status;
2305
2306         struct ab8500_charger *di = container_of(work,
2307                 struct ab8500_charger, usb_link_status_work);
2308
2309         /*
2310          * Since we can't be sure that the events are received
2311          * synchronously, we have the check if  is
2312          * connected by reading the status register
2313          */
2314         detected_chargers = ab8500_charger_detect_chargers(di, false);
2315         if (detected_chargers < 0)
2316                 return;
2317
2318         /*
2319          * Some chargers that breaks the USB spec is
2320          * identified as invalid by AB8500 and it refuse
2321          * to start the charging process. but by jumping
2322          * thru a few hoops it can be forced to start.
2323          */
2324         if (is_ab8500(di->parent))
2325                 ret = abx500_get_register_interruptible(di->dev, AB8500_USB,
2326                                         AB8500_USB_LINE_STAT_REG, &val);
2327         else
2328                 ret = abx500_get_register_interruptible(di->dev, AB8500_USB,
2329                                         AB8500_USB_LINK1_STAT_REG, &val);
2330
2331         if (ret >= 0)
2332                 dev_dbg(di->dev, "UsbLineStatus register = 0x%02x\n", val);
2333         else
2334                 dev_dbg(di->dev, "Error reading USB link status\n");
2335
2336         if (is_ab8500(di->parent))
2337                 link_status = AB8500_USB_LINK_STATUS;
2338         else
2339                 link_status = AB8505_USB_LINK_STATUS;
2340
2341         if (detected_chargers & USB_PW_CONN) {
2342                 if (((val & link_status) >> USB_LINK_STATUS_SHIFT) ==
2343                                 USB_STAT_NOT_VALID_LINK &&
2344                                 di->invalid_charger_detect_state == 0) {
2345                         dev_dbg(di->dev,
2346                                         "Invalid charger detected, state= 0\n");
2347                         /*Enable charger*/
2348                         abx500_mask_and_set_register_interruptible(di->dev,
2349                                         AB8500_CHARGER, AB8500_USBCH_CTRL1_REG,
2350                                         USB_CH_ENA, USB_CH_ENA);
2351                         /*Enable charger detection*/
2352                         abx500_mask_and_set_register_interruptible(di->dev,
2353                                         AB8500_USB, AB8500_USB_LINE_CTRL2_REG,
2354                                         USB_CH_DET, USB_CH_DET);
2355                         di->invalid_charger_detect_state = 1;
2356                         /*exit and wait for new link status interrupt.*/
2357                         return;
2358
2359                 }
2360                 if (di->invalid_charger_detect_state == 1) {
2361                         dev_dbg(di->dev,
2362                                         "Invalid charger detected, state= 1\n");
2363                         /*Stop charger detection*/
2364                         abx500_mask_and_set_register_interruptible(di->dev,
2365                                         AB8500_USB, AB8500_USB_LINE_CTRL2_REG,
2366                                         USB_CH_DET, 0x00);
2367                         /*Check link status*/
2368                         if (is_ab8500(di->parent))
2369                                 ret = abx500_get_register_interruptible(di->dev,
2370                                         AB8500_USB, AB8500_USB_LINE_STAT_REG,
2371                                         &val);
2372                         else
2373                                 ret = abx500_get_register_interruptible(di->dev,
2374                                         AB8500_USB, AB8500_USB_LINK1_STAT_REG,
2375                                         &val);
2376
2377                         dev_dbg(di->dev, "USB link status= 0x%02x\n",
2378                                 (val & link_status) >> USB_LINK_STATUS_SHIFT);
2379                         di->invalid_charger_detect_state = 2;
2380                 }
2381         } else {
2382                 di->invalid_charger_detect_state = 0;
2383         }
2384
2385         if (!(detected_chargers & USB_PW_CONN)) {
2386                 di->vbus_detected = false;
2387                 ab8500_charger_set_usb_connected(di, false);
2388                 ab8500_power_supply_changed(di, &di->usb_chg.psy);
2389                 return;
2390         }
2391
2392         dev_dbg(di->dev,"%s di->vbus_detected = true\n",__func__);
2393         di->vbus_detected = true;
2394         ret = ab8500_charger_read_usb_type(di);
2395         if (ret) {
2396                 if (ret == -ENXIO) {
2397                         /* No valid charger type detected */
2398                         ab8500_charger_set_usb_connected(di, false);
2399                         ab8500_power_supply_changed(di, &di->usb_chg.psy);
2400                 }
2401                 return;
2402         }
2403
2404         if (di->usb_device_is_unrecognised) {
2405                 dev_dbg(di->dev,
2406                         "Potential Legacy Charger device. "
2407                         "Delay work for %d msec for USB enum "
2408                         "to finish",
2409                         WAIT_ACA_RID_ENUMERATION);
2410                 queue_delayed_work(di->charger_wq,
2411                                    &di->attach_work,
2412                                    msecs_to_jiffies(WAIT_ACA_RID_ENUMERATION));
2413         } else if (di->is_aca_rid == 1) {
2414                 /* Only wait once */
2415                 di->is_aca_rid++;
2416                 dev_dbg(di->dev,
2417                         "%s Wait %d msec for USB enum to finish",
2418                         __func__, WAIT_ACA_RID_ENUMERATION);
2419                 queue_delayed_work(di->charger_wq,
2420                                    &di->attach_work,
2421                                    msecs_to_jiffies(WAIT_ACA_RID_ENUMERATION));
2422         } else {
2423                 queue_delayed_work(di->charger_wq,
2424                                    &di->attach_work,
2425                                    0);
2426         }
2427 }
2428
2429 static void ab8500_charger_usb_state_changed_work(struct work_struct *work)
2430 {
2431         int ret;
2432         unsigned long flags;
2433
2434         struct ab8500_charger *di = container_of(work,
2435                 struct ab8500_charger, usb_state_changed_work.work);
2436
2437         if (!di->vbus_detected) {
2438                 dev_dbg(di->dev,
2439                         "%s !di->vbus_detected\n",
2440                         __func__);
2441                 return;
2442         }
2443
2444         spin_lock_irqsave(&di->usb_state.usb_lock, flags);
2445         di->usb_state.state = di->usb_state.state_tmp;
2446         di->usb_state.usb_current = di->usb_state.usb_current_tmp;
2447         spin_unlock_irqrestore(&di->usb_state.usb_lock, flags);
2448
2449         dev_dbg(di->dev, "%s USB state: 0x%02x mA: %d\n",
2450                 __func__, di->usb_state.state, di->usb_state.usb_current);
2451
2452         switch (di->usb_state.state) {
2453         case AB8500_BM_USB_STATE_RESET_HS:
2454         case AB8500_BM_USB_STATE_RESET_FS:
2455         case AB8500_BM_USB_STATE_SUSPEND:
2456         case AB8500_BM_USB_STATE_MAX:
2457                 ab8500_charger_set_usb_connected(di, false);
2458                 ab8500_power_supply_changed(di, &di->usb_chg.psy);
2459                 break;
2460
2461         case AB8500_BM_USB_STATE_RESUME:
2462                 /*
2463                  * when suspend->resume there should be delay
2464                  * of 1sec for enabling charging
2465                  */
2466                 msleep(1000);
2467                 /* Intentional fall through */
2468         case AB8500_BM_USB_STATE_CONFIGURED:
2469                 /*
2470                  * USB is configured, enable charging with the charging
2471                  * input current obtained from USB driver
2472                  */
2473                 if (!ab8500_charger_get_usb_cur(di)) {
2474                         /* Update maximum input current */
2475                         ret = ab8500_charger_set_vbus_in_curr(di,
2476                                         di->max_usb_in_curr.usb_type_max);
2477                         if (ret)
2478                                 return;
2479
2480                         ab8500_charger_set_usb_connected(di, true);
2481                         ab8500_power_supply_changed(di, &di->usb_chg.psy);
2482                 }
2483                 break;
2484
2485         default:
2486                 break;
2487         };
2488 }
2489
2490 /**
2491  * ab8500_charger_check_usbchargernotok_work() - check USB chg not ok status
2492  * @work:       pointer to the work_struct structure
2493  *
2494  * Work queue function for checking the USB charger Not OK status
2495  */
2496 static void ab8500_charger_check_usbchargernotok_work(struct work_struct *work)
2497 {
2498         int ret;
2499         u8 reg_value;
2500         bool prev_status;
2501
2502         struct ab8500_charger *di = container_of(work,
2503                 struct ab8500_charger, check_usbchgnotok_work.work);
2504
2505         /* Check if the status bit for usbchargernotok is still active */
2506         ret = abx500_get_register_interruptible(di->dev,
2507                 AB8500_CHARGER, AB8500_CH_USBCH_STAT2_REG, &reg_value);
2508         if (ret < 0) {
2509                 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
2510                 return;
2511         }
2512         prev_status = di->flags.usbchargernotok;
2513
2514         if (reg_value & VBUS_CH_NOK) {
2515                 di->flags.usbchargernotok = true;
2516                 /* Check again in 1sec */
2517                 queue_delayed_work(di->charger_wq,
2518                         &di->check_usbchgnotok_work, HZ);
2519         } else {
2520                 di->flags.usbchargernotok = false;
2521                 di->flags.vbus_collapse = false;
2522         }
2523
2524         if (prev_status != di->flags.usbchargernotok)
2525                 ab8500_power_supply_changed(di, &di->usb_chg.psy);
2526 }
2527
2528 /**
2529  * ab8500_charger_check_main_thermal_prot_work() - check main thermal status
2530  * @work:       pointer to the work_struct structure
2531  *
2532  * Work queue function for checking the Main thermal prot status
2533  */
2534 static void ab8500_charger_check_main_thermal_prot_work(
2535         struct work_struct *work)
2536 {
2537         int ret;
2538         u8 reg_value;
2539
2540         struct ab8500_charger *di = container_of(work,
2541                 struct ab8500_charger, check_main_thermal_prot_work);
2542
2543         /* Check if the status bit for main_thermal_prot is still active */
2544         ret = abx500_get_register_interruptible(di->dev,
2545                 AB8500_CHARGER, AB8500_CH_STATUS2_REG, &reg_value);
2546         if (ret < 0) {
2547                 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
2548                 return;
2549         }
2550         if (reg_value & MAIN_CH_TH_PROT)
2551                 di->flags.main_thermal_prot = true;
2552         else
2553                 di->flags.main_thermal_prot = false;
2554
2555         ab8500_power_supply_changed(di, &di->ac_chg.psy);
2556 }
2557
2558 /**
2559  * ab8500_charger_check_usb_thermal_prot_work() - check usb thermal status
2560  * @work:       pointer to the work_struct structure
2561  *
2562  * Work queue function for checking the USB thermal prot status
2563  */
2564 static void ab8500_charger_check_usb_thermal_prot_work(
2565         struct work_struct *work)
2566 {
2567         int ret;
2568         u8 reg_value;
2569
2570         struct ab8500_charger *di = container_of(work,
2571                 struct ab8500_charger, check_usb_thermal_prot_work);
2572
2573         /* Check if the status bit for usb_thermal_prot is still active */
2574         ret = abx500_get_register_interruptible(di->dev,
2575                 AB8500_CHARGER, AB8500_CH_USBCH_STAT2_REG, &reg_value);
2576         if (ret < 0) {
2577                 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
2578                 return;
2579         }
2580         if (reg_value & USB_CH_TH_PROT)
2581                 di->flags.usb_thermal_prot = true;
2582         else
2583                 di->flags.usb_thermal_prot = false;
2584
2585         ab8500_power_supply_changed(di, &di->usb_chg.psy);
2586 }
2587
2588 /**
2589  * ab8500_charger_mainchunplugdet_handler() - main charger unplugged
2590  * @irq:       interrupt number
2591  * @_di:       pointer to the ab8500_charger structure
2592  *
2593  * Returns IRQ status(IRQ_HANDLED)
2594  */
2595 static irqreturn_t ab8500_charger_mainchunplugdet_handler(int irq, void *_di)
2596 {
2597         struct ab8500_charger *di = _di;
2598
2599         dev_dbg(di->dev, "Main charger unplugged\n");
2600         queue_work(di->charger_wq, &di->ac_work);
2601
2602         cancel_delayed_work_sync(&di->ac_charger_attached_work);
2603         mutex_lock(&di->charger_attached_mutex);
2604         mutex_unlock(&di->charger_attached_mutex);
2605
2606         return IRQ_HANDLED;
2607 }
2608
2609 /**
2610  * ab8500_charger_mainchplugdet_handler() - main charger plugged
2611  * @irq:       interrupt number
2612  * @_di:       pointer to the ab8500_charger structure
2613  *
2614  * Returns IRQ status(IRQ_HANDLED)
2615  */
2616 static irqreturn_t ab8500_charger_mainchplugdet_handler(int irq, void *_di)
2617 {
2618         struct ab8500_charger *di = _di;
2619
2620         dev_dbg(di->dev, "Main charger plugged\n");
2621         queue_work(di->charger_wq, &di->ac_work);
2622
2623         mutex_lock(&di->charger_attached_mutex);
2624         mutex_unlock(&di->charger_attached_mutex);
2625
2626         if (is_ab8500(di->parent))
2627                 queue_delayed_work(di->charger_wq,
2628                            &di->ac_charger_attached_work,
2629                            HZ);
2630         return IRQ_HANDLED;
2631 }
2632
2633 /**
2634  * ab8500_charger_mainextchnotok_handler() - main charger not ok
2635  * @irq:       interrupt number
2636  * @_di:       pointer to the ab8500_charger structure
2637  *
2638  * Returns IRQ status(IRQ_HANDLED)
2639  */
2640 static irqreturn_t ab8500_charger_mainextchnotok_handler(int irq, void *_di)
2641 {
2642         struct ab8500_charger *di = _di;
2643
2644         dev_dbg(di->dev, "Main charger not ok\n");
2645         di->flags.mainextchnotok = true;
2646         ab8500_power_supply_changed(di, &di->ac_chg.psy);
2647
2648         /* Schedule a new HW failure check */
2649         queue_delayed_work(di->charger_wq, &di->check_hw_failure_work, 0);
2650
2651         return IRQ_HANDLED;
2652 }
2653
2654 /**
2655  * ab8500_charger_mainchthprotr_handler() - Die temp is above main charger
2656  * thermal protection threshold
2657  * @irq:       interrupt number
2658  * @_di:       pointer to the ab8500_charger structure
2659  *
2660  * Returns IRQ status(IRQ_HANDLED)
2661  */
2662 static irqreturn_t ab8500_charger_mainchthprotr_handler(int irq, void *_di)
2663 {
2664         struct ab8500_charger *di = _di;
2665
2666         dev_dbg(di->dev,
2667                 "Die temp above Main charger thermal protection threshold\n");
2668         queue_work(di->charger_wq, &di->check_main_thermal_prot_work);
2669
2670         return IRQ_HANDLED;
2671 }
2672
2673 /**
2674  * ab8500_charger_mainchthprotf_handler() - Die temp is below main charger
2675  * thermal protection threshold
2676  * @irq:       interrupt number
2677  * @_di:       pointer to the ab8500_charger structure
2678  *
2679  * Returns IRQ status(IRQ_HANDLED)
2680  */
2681 static irqreturn_t ab8500_charger_mainchthprotf_handler(int irq, void *_di)
2682 {
2683         struct ab8500_charger *di = _di;
2684
2685         dev_dbg(di->dev,
2686                 "Die temp ok for Main charger thermal protection threshold\n");
2687         queue_work(di->charger_wq, &di->check_main_thermal_prot_work);
2688
2689         return IRQ_HANDLED;
2690 }
2691
2692 static void ab8500_charger_vbus_drop_end_work(struct work_struct *work)
2693 {
2694         struct ab8500_charger *di = container_of(work,
2695                 struct ab8500_charger, vbus_drop_end_work.work);
2696         int ret, curr;
2697         u8 reg_value;
2698
2699         di->flags.vbus_drop_end = false;
2700
2701         /* Reset the drop counter */
2702         abx500_set_register_interruptible(di->dev,
2703                                   AB8500_CHARGER, AB8500_CHARGER_CTRL, 0x01);
2704
2705         if (is_ab8540(di->parent))
2706                 ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
2707                                 AB8540_CH_USBCH_STAT3_REG, &reg_value);
2708         else
2709                 ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
2710                                 AB8500_CH_USBCH_STAT2_REG, &reg_value);
2711         if (ret < 0) {
2712                 dev_err(di->dev, "%s read failed\n", __func__);
2713                 return;
2714         }
2715
2716         if (is_ab8540(di->parent))
2717                 curr = di->bm->chg_input_curr[
2718                         reg_value & AB8540_AUTO_VBUS_IN_CURR_MASK];
2719         else
2720                 curr = di->bm->chg_input_curr[
2721                         reg_value >> AUTO_VBUS_IN_CURR_LIM_SHIFT];
2722
2723         if (di->max_usb_in_curr.calculated_max != curr) {
2724                 /* USB source is collapsing */
2725                 di->max_usb_in_curr.calculated_max = curr;
2726                 dev_dbg(di->dev,
2727                          "VBUS input current limiting to %d mA\n",
2728                          di->max_usb_in_curr.calculated_max);
2729         } else {
2730                 /*
2731                  * USB source can not give more than this amount.
2732                  * Taking more will collapse the source.
2733                  */
2734                 di->max_usb_in_curr.set_max =
2735                         di->max_usb_in_curr.calculated_max;
2736                 dev_dbg(di->dev,
2737                          "VBUS input current limited to %d mA\n",
2738                          di->max_usb_in_curr.set_max);
2739         }
2740
2741         if (di->usb.charger_connected)
2742                 ab8500_charger_set_vbus_in_curr(di,
2743                                         di->max_usb_in_curr.usb_type_max);
2744 }
2745
2746 /**
2747  * ab8500_charger_vbusdetf_handler() - VBUS falling detected
2748  * @irq:       interrupt number
2749  * @_di:       pointer to the ab8500_charger structure
2750  *
2751  * Returns IRQ status(IRQ_HANDLED)
2752  */
2753 static irqreturn_t ab8500_charger_vbusdetf_handler(int irq, void *_di)
2754 {
2755         struct ab8500_charger *di = _di;
2756
2757         di->vbus_detected = false;
2758         dev_dbg(di->dev, "VBUS falling detected\n");
2759         queue_work(di->charger_wq, &di->detect_usb_type_work);
2760
2761         return IRQ_HANDLED;
2762 }
2763
2764 /**
2765  * ab8500_charger_vbusdetr_handler() - VBUS rising detected
2766  * @irq:       interrupt number
2767  * @_di:       pointer to the ab8500_charger structure
2768  *
2769  * Returns IRQ status(IRQ_HANDLED)
2770  */
2771 static irqreturn_t ab8500_charger_vbusdetr_handler(int irq, void *_di)
2772 {
2773         struct ab8500_charger *di = _di;
2774
2775         di->vbus_detected = true;
2776         dev_dbg(di->dev, "VBUS rising detected\n");
2777
2778         queue_work(di->charger_wq, &di->detect_usb_type_work);
2779
2780         return IRQ_HANDLED;
2781 }
2782
2783 /**
2784  * ab8500_charger_usblinkstatus_handler() - USB link status has changed
2785  * @irq:       interrupt number
2786  * @_di:       pointer to the ab8500_charger structure
2787  *
2788  * Returns IRQ status(IRQ_HANDLED)
2789  */
2790 static irqreturn_t ab8500_charger_usblinkstatus_handler(int irq, void *_di)
2791 {
2792         struct ab8500_charger *di = _di;
2793
2794         dev_dbg(di->dev, "USB link status changed\n");
2795
2796         queue_work(di->charger_wq, &di->usb_link_status_work);
2797
2798         return IRQ_HANDLED;
2799 }
2800
2801 /**
2802  * ab8500_charger_usbchthprotr_handler() - Die temp is above usb charger
2803  * thermal protection threshold
2804  * @irq:       interrupt number
2805  * @_di:       pointer to the ab8500_charger structure
2806  *
2807  * Returns IRQ status(IRQ_HANDLED)
2808  */
2809 static irqreturn_t ab8500_charger_usbchthprotr_handler(int irq, void *_di)
2810 {
2811         struct ab8500_charger *di = _di;
2812
2813         dev_dbg(di->dev,
2814                 "Die temp above USB charger thermal protection threshold\n");
2815         queue_work(di->charger_wq, &di->check_usb_thermal_prot_work);
2816
2817         return IRQ_HANDLED;
2818 }
2819
2820 /**
2821  * ab8500_charger_usbchthprotf_handler() - Die temp is below usb charger
2822  * thermal protection threshold
2823  * @irq:       interrupt number
2824  * @_di:       pointer to the ab8500_charger structure
2825  *
2826  * Returns IRQ status(IRQ_HANDLED)
2827  */
2828 static irqreturn_t ab8500_charger_usbchthprotf_handler(int irq, void *_di)
2829 {
2830         struct ab8500_charger *di = _di;
2831
2832         dev_dbg(di->dev,
2833                 "Die temp ok for USB charger thermal protection threshold\n");
2834         queue_work(di->charger_wq, &di->check_usb_thermal_prot_work);
2835
2836         return IRQ_HANDLED;
2837 }
2838
2839 /**
2840  * ab8500_charger_usbchargernotokr_handler() - USB charger not ok detected
2841  * @irq:       interrupt number
2842  * @_di:       pointer to the ab8500_charger structure
2843  *
2844  * Returns IRQ status(IRQ_HANDLED)
2845  */
2846 static irqreturn_t ab8500_charger_usbchargernotokr_handler(int irq, void *_di)
2847 {
2848         struct ab8500_charger *di = _di;
2849
2850         dev_dbg(di->dev, "Not allowed USB charger detected\n");
2851         queue_delayed_work(di->charger_wq, &di->check_usbchgnotok_work, 0);
2852
2853         return IRQ_HANDLED;
2854 }
2855
2856 /**
2857  * ab8500_charger_chwdexp_handler() - Charger watchdog expired
2858  * @irq:       interrupt number
2859  * @_di:       pointer to the ab8500_charger structure
2860  *
2861  * Returns IRQ status(IRQ_HANDLED)
2862  */
2863 static irqreturn_t ab8500_charger_chwdexp_handler(int irq, void *_di)
2864 {
2865         struct ab8500_charger *di = _di;
2866
2867         dev_dbg(di->dev, "Charger watchdog expired\n");
2868
2869         /*
2870          * The charger that was online when the watchdog expired
2871          * needs to be restarted for charging to start again
2872          */
2873         if (di->ac.charger_online) {
2874                 di->ac.wd_expired = true;
2875                 ab8500_power_supply_changed(di, &di->ac_chg.psy);
2876         }
2877         if (di->usb.charger_online) {
2878                 di->usb.wd_expired = true;
2879                 ab8500_power_supply_changed(di, &di->usb_chg.psy);
2880         }
2881
2882         return IRQ_HANDLED;
2883 }
2884
2885 /**
2886  * ab8500_charger_vbuschdropend_handler() - VBUS drop removed
2887  * @irq:       interrupt number
2888  * @_di:       pointer to the ab8500_charger structure
2889  *
2890  * Returns IRQ status(IRQ_HANDLED)
2891  */
2892 static irqreturn_t ab8500_charger_vbuschdropend_handler(int irq, void *_di)
2893 {
2894         struct ab8500_charger *di = _di;
2895
2896         dev_dbg(di->dev, "VBUS charger drop ended\n");
2897         di->flags.vbus_drop_end = true;
2898
2899         /*
2900          * VBUS might have dropped due to bad connection.
2901          * Schedule a new input limit set to the value SW requests.
2902          */
2903         queue_delayed_work(di->charger_wq, &di->vbus_drop_end_work,
2904                            round_jiffies(VBUS_IN_CURR_LIM_RETRY_SET_TIME * HZ));
2905
2906         return IRQ_HANDLED;
2907 }
2908
2909 /**
2910  * ab8500_charger_vbusovv_handler() - VBUS overvoltage detected
2911  * @irq:       interrupt number
2912  * @_di:       pointer to the ab8500_charger structure
2913  *
2914  * Returns IRQ status(IRQ_HANDLED)
2915  */
2916 static irqreturn_t ab8500_charger_vbusovv_handler(int irq, void *_di)
2917 {
2918         struct ab8500_charger *di = _di;
2919
2920         dev_dbg(di->dev, "VBUS overvoltage detected\n");
2921         di->flags.vbus_ovv = true;
2922         ab8500_power_supply_changed(di, &di->usb_chg.psy);
2923
2924         /* Schedule a new HW failure check */
2925         queue_delayed_work(di->charger_wq, &di->check_hw_failure_work, 0);
2926
2927         return IRQ_HANDLED;
2928 }
2929
2930 /**
2931  * ab8500_charger_ac_get_property() - get the ac/mains properties
2932  * @psy:       pointer to the power_supply structure
2933  * @psp:       pointer to the power_supply_property structure
2934  * @val:       pointer to the power_supply_propval union
2935  *
2936  * This function gets called when an application tries to get the ac/mains
2937  * properties by reading the sysfs files.
2938  * AC/Mains properties are online, present and voltage.
2939  * online:     ac/mains charging is in progress or not
2940  * present:    presence of the ac/mains
2941  * voltage:    AC/Mains voltage
2942  * Returns error code in case of failure else 0(on success)
2943  */
2944 static int ab8500_charger_ac_get_property(struct power_supply *psy,
2945         enum power_supply_property psp,
2946         union power_supply_propval *val)
2947 {
2948         struct ab8500_charger *di;
2949         int ret;
2950
2951         di = to_ab8500_charger_ac_device_info(psy_to_ux500_charger(psy));
2952
2953         switch (psp) {
2954         case POWER_SUPPLY_PROP_HEALTH:
2955                 if (di->flags.mainextchnotok)
2956                         val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
2957                 else if (di->ac.wd_expired || di->usb.wd_expired)
2958                         val->intval = POWER_SUPPLY_HEALTH_DEAD;
2959                 else if (di->flags.main_thermal_prot)
2960                         val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
2961                 else
2962                         val->intval = POWER_SUPPLY_HEALTH_GOOD;
2963                 break;
2964         case POWER_SUPPLY_PROP_ONLINE:
2965                 val->intval = di->ac.charger_online;
2966                 break;
2967         case POWER_SUPPLY_PROP_PRESENT:
2968                 val->intval = di->ac.charger_connected;
2969                 break;
2970         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
2971                 ret = ab8500_charger_get_ac_voltage(di);
2972                 if (ret >= 0)
2973                         di->ac.charger_voltage = ret;
2974                 /* On error, use previous value */
2975                 val->intval = di->ac.charger_voltage * 1000;
2976                 break;
2977         case POWER_SUPPLY_PROP_VOLTAGE_AVG:
2978                 /*
2979                  * This property is used to indicate when CV mode is entered
2980                  * for the AC charger
2981                  */
2982                 di->ac.cv_active = ab8500_charger_ac_cv(di);
2983                 val->intval = di->ac.cv_active;
2984                 break;
2985         case POWER_SUPPLY_PROP_CURRENT_NOW:
2986                 ret = ab8500_charger_get_ac_current(di);
2987                 if (ret >= 0)
2988                         di->ac.charger_current = ret;
2989                 val->intval = di->ac.charger_current * 1000;
2990                 break;
2991         default:
2992                 return -EINVAL;
2993         }
2994         return 0;
2995 }
2996
2997 /**
2998  * ab8500_charger_usb_get_property() - get the usb properties
2999  * @psy:        pointer to the power_supply structure
3000  * @psp:        pointer to the power_supply_property structure
3001  * @val:        pointer to the power_supply_propval union
3002  *
3003  * This function gets called when an application tries to get the usb
3004  * properties by reading the sysfs files.
3005  * USB properties are online, present and voltage.
3006  * online:     usb charging is in progress or not
3007  * present:    presence of the usb
3008  * voltage:    vbus voltage
3009  * Returns error code in case of failure else 0(on success)
3010  */
3011 static int ab8500_charger_usb_get_property(struct power_supply *psy,
3012         enum power_supply_property psp,
3013         union power_supply_propval *val)
3014 {
3015         struct ab8500_charger *di;
3016         int ret;
3017
3018         di = to_ab8500_charger_usb_device_info(psy_to_ux500_charger(psy));
3019
3020         switch (psp) {
3021         case POWER_SUPPLY_PROP_HEALTH:
3022                 if (di->flags.usbchargernotok)
3023                         val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
3024                 else if (di->ac.wd_expired || di->usb.wd_expired)
3025                         val->intval = POWER_SUPPLY_HEALTH_DEAD;
3026                 else if (di->flags.usb_thermal_prot)
3027                         val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
3028                 else if (di->flags.vbus_ovv)
3029                         val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
3030                 else
3031                         val->intval = POWER_SUPPLY_HEALTH_GOOD;
3032                 break;
3033         case POWER_SUPPLY_PROP_ONLINE:
3034                 val->intval = di->usb.charger_online;
3035                 break;
3036         case POWER_SUPPLY_PROP_PRESENT:
3037                 val->intval = di->usb.charger_connected;
3038                 break;
3039         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
3040                 ret = ab8500_charger_get_vbus_voltage(di);
3041                 if (ret >= 0)
3042                         di->usb.charger_voltage = ret;
3043                 val->intval = di->usb.charger_voltage * 1000;
3044                 break;
3045         case POWER_SUPPLY_PROP_VOLTAGE_AVG:
3046                 /*
3047                  * This property is used to indicate when CV mode is entered
3048                  * for the USB charger
3049                  */
3050                 di->usb.cv_active = ab8500_charger_usb_cv(di);
3051                 val->intval = di->usb.cv_active;
3052                 break;
3053         case POWER_SUPPLY_PROP_CURRENT_NOW:
3054                 ret = ab8500_charger_get_usb_current(di);
3055                 if (ret >= 0)
3056                         di->usb.charger_current = ret;
3057                 val->intval = di->usb.charger_current * 1000;
3058                 break;
3059         case POWER_SUPPLY_PROP_CURRENT_AVG:
3060                 /*
3061                  * This property is used to indicate when VBUS has collapsed
3062                  * due to too high output current from the USB charger
3063                  */
3064                 if (di->flags.vbus_collapse)
3065                         val->intval = 1;
3066                 else
3067                         val->intval = 0;
3068                 break;
3069         default:
3070                 return -EINVAL;
3071         }
3072         return 0;
3073 }
3074
3075 /**
3076  * ab8500_charger_init_hw_registers() - Set up charger related registers
3077  * @di:         pointer to the ab8500_charger structure
3078  *
3079  * Set up charger OVV, watchdog and maximum voltage registers as well as
3080  * charging of the backup battery
3081  */
3082 static int ab8500_charger_init_hw_registers(struct ab8500_charger *di)
3083 {
3084         int ret = 0;
3085         u8 bup_vch_range = 0, vbup33_vrtcn = 0;
3086
3087         /* Setup maximum charger current and voltage for ABB cut2.0 */
3088         if (!is_ab8500_1p1_or_earlier(di->parent)) {
3089                 ret = abx500_set_register_interruptible(di->dev,
3090                         AB8500_CHARGER,
3091                         AB8500_CH_VOLT_LVL_MAX_REG, CH_VOL_LVL_4P6);
3092                 if (ret) {
3093                         dev_err(di->dev,
3094                                 "failed to set CH_VOLT_LVL_MAX_REG\n");
3095                         goto out;
3096                 }
3097
3098                 if (is_ab8540(di->parent))
3099                         ret = abx500_set_register_interruptible(di->dev,
3100                                 AB8500_CHARGER, AB8500_CH_OPT_CRNTLVL_MAX_REG,
3101                                 CH_OP_CUR_LVL_2P);
3102                 else
3103                         ret = abx500_set_register_interruptible(di->dev,
3104                                 AB8500_CHARGER, AB8500_CH_OPT_CRNTLVL_MAX_REG,
3105                                 CH_OP_CUR_LVL_1P6);
3106                 if (ret) {
3107                         dev_err(di->dev,
3108                                 "failed to set CH_OPT_CRNTLVL_MAX_REG\n");
3109                         goto out;
3110                 }
3111         }
3112
3113         if (is_ab9540_2p0(di->parent) || is_ab9540_3p0(di->parent)
3114          || is_ab8505_2p0(di->parent) || is_ab8540(di->parent))
3115                 ret = abx500_mask_and_set_register_interruptible(di->dev,
3116                         AB8500_CHARGER,
3117                         AB8500_USBCH_CTRL2_REG,
3118                         VBUS_AUTO_IN_CURR_LIM_ENA,
3119                         VBUS_AUTO_IN_CURR_LIM_ENA);
3120         else
3121                 /*
3122                  * VBUS OVV set to 6.3V and enable automatic current limitation
3123                  */
3124                 ret = abx500_set_register_interruptible(di->dev,
3125                         AB8500_CHARGER,
3126                         AB8500_USBCH_CTRL2_REG,
3127                         VBUS_OVV_SELECT_6P3V | VBUS_AUTO_IN_CURR_LIM_ENA);
3128         if (ret) {
3129                 dev_err(di->dev,
3130                         "failed to set automatic current limitation\n");
3131                 goto out;
3132         }
3133
3134         /* Enable main watchdog in OTP */
3135         ret = abx500_set_register_interruptible(di->dev,
3136                 AB8500_OTP_EMUL, AB8500_OTP_CONF_15, OTP_ENABLE_WD);
3137         if (ret) {
3138                 dev_err(di->dev, "failed to enable main WD in OTP\n");
3139                 goto out;
3140         }
3141
3142         /* Enable main watchdog */
3143         ret = abx500_set_register_interruptible(di->dev,
3144                 AB8500_SYS_CTRL2_BLOCK,
3145                 AB8500_MAIN_WDOG_CTRL_REG, MAIN_WDOG_ENA);
3146         if (ret) {
3147                 dev_err(di->dev, "faile to enable main watchdog\n");
3148                 goto out;
3149         }
3150
3151         /*
3152          * Due to internal synchronisation, Enable and Kick watchdog bits
3153          * cannot be enabled in a single write.
3154          * A minimum delay of 2*32 kHz period (62.5µs) must be inserted
3155          * between writing Enable then Kick bits.
3156          */
3157         udelay(63);
3158
3159         /* Kick main watchdog */
3160         ret = abx500_set_register_interruptible(di->dev,
3161                 AB8500_SYS_CTRL2_BLOCK,
3162                 AB8500_MAIN_WDOG_CTRL_REG,
3163                 (MAIN_WDOG_ENA | MAIN_WDOG_KICK));
3164         if (ret) {
3165                 dev_err(di->dev, "failed to kick main watchdog\n");
3166                 goto out;
3167         }
3168
3169         /* Disable main watchdog */
3170         ret = abx500_set_register_interruptible(di->dev,
3171                 AB8500_SYS_CTRL2_BLOCK,
3172                 AB8500_MAIN_WDOG_CTRL_REG, MAIN_WDOG_DIS);
3173         if (ret) {
3174                 dev_err(di->dev, "failed to disable main watchdog\n");
3175                 goto out;
3176         }
3177
3178         /* Set watchdog timeout */
3179         ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
3180                 AB8500_CH_WD_TIMER_REG, WD_TIMER);
3181         if (ret) {
3182                 dev_err(di->dev, "failed to set charger watchdog timeout\n");
3183                 goto out;
3184         }
3185
3186         ret = ab8500_charger_led_en(di, false);
3187         if (ret < 0) {
3188                 dev_err(di->dev, "failed to disable LED\n");
3189                 goto out;
3190         }
3191
3192         /* Backup battery voltage and current */
3193         if (di->bm->bkup_bat_v > BUP_VCH_SEL_3P1V)
3194                 bup_vch_range = BUP_VCH_RANGE;
3195         if (di->bm->bkup_bat_v == BUP_VCH_SEL_3P3V)
3196                 vbup33_vrtcn = VBUP33_VRTCN;
3197
3198         ret = abx500_set_register_interruptible(di->dev,
3199                 AB8500_RTC,
3200                 AB8500_RTC_BACKUP_CHG_REG,
3201                 (di->bm->bkup_bat_v & 0x3) | di->bm->bkup_bat_i);
3202         if (ret) {
3203                 dev_err(di->dev, "failed to setup backup battery charging\n");
3204                 goto out;
3205         }
3206         if (is_ab8540(di->parent)) {
3207                 ret = abx500_set_register_interruptible(di->dev,
3208                         AB8500_RTC,
3209                         AB8500_RTC_CTRL1_REG,
3210                         bup_vch_range | vbup33_vrtcn);
3211                 if (ret) {
3212                         dev_err(di->dev,
3213                                 "failed to setup backup battery charging\n");
3214                         goto out;
3215                 }
3216         }
3217
3218         /* Enable backup battery charging */
3219         abx500_mask_and_set_register_interruptible(di->dev,
3220                 AB8500_RTC, AB8500_RTC_CTRL_REG,
3221                 RTC_BUP_CH_ENA, RTC_BUP_CH_ENA);
3222         if (ret < 0)
3223                 dev_err(di->dev, "%s mask and set failed\n", __func__);
3224
3225         if (is_ab8540(di->parent)) {
3226                 ret = abx500_mask_and_set_register_interruptible(di->dev,
3227                         AB8500_CHARGER, AB8540_USB_PP_MODE_REG,
3228                         BUS_VSYS_VOL_SELECT_MASK, BUS_VSYS_VOL_SELECT_3P6V);
3229                 if (ret) {
3230                         dev_err(di->dev,
3231                                 "failed to setup usb power path vsys voltage\n");
3232                         goto out;
3233                 }
3234                 ret = abx500_mask_and_set_register_interruptible(di->dev,
3235                         AB8500_CHARGER, AB8540_USB_PP_CHR_REG,
3236                         BUS_PP_PRECHG_CURRENT_MASK, 0);
3237                 if (ret) {
3238                         dev_err(di->dev,
3239                                 "failed to setup usb power path prechage current\n");
3240                         goto out;
3241                 }
3242         }
3243
3244 out:
3245         return ret;
3246 }
3247
3248 /*
3249  * ab8500 charger driver interrupts and their respective isr
3250  */
3251 static struct ab8500_charger_interrupts ab8500_charger_irq[] = {
3252         {"MAIN_CH_UNPLUG_DET", ab8500_charger_mainchunplugdet_handler},
3253         {"MAIN_CHARGE_PLUG_DET", ab8500_charger_mainchplugdet_handler},
3254         {"MAIN_EXT_CH_NOT_OK", ab8500_charger_mainextchnotok_handler},
3255         {"MAIN_CH_TH_PROT_R", ab8500_charger_mainchthprotr_handler},
3256         {"MAIN_CH_TH_PROT_F", ab8500_charger_mainchthprotf_handler},
3257         {"VBUS_DET_F", ab8500_charger_vbusdetf_handler},
3258         {"VBUS_DET_R", ab8500_charger_vbusdetr_handler},
3259         {"USB_LINK_STATUS", ab8500_charger_usblinkstatus_handler},
3260         {"USB_CH_TH_PROT_R", ab8500_charger_usbchthprotr_handler},
3261         {"USB_CH_TH_PROT_F", ab8500_charger_usbchthprotf_handler},
3262         {"USB_CHARGER_NOT_OKR", ab8500_charger_usbchargernotokr_handler},
3263         {"VBUS_OVV", ab8500_charger_vbusovv_handler},
3264         {"CH_WD_EXP", ab8500_charger_chwdexp_handler},
3265         {"VBUS_CH_DROP_END", ab8500_charger_vbuschdropend_handler},
3266 };
3267
3268 static int ab8500_charger_usb_notifier_call(struct notifier_block *nb,
3269                 unsigned long event, void *power)
3270 {
3271         struct ab8500_charger *di =
3272                 container_of(nb, struct ab8500_charger, nb);
3273         enum ab8500_usb_state bm_usb_state;
3274         unsigned mA = *((unsigned *)power);
3275
3276         if (!di)
3277                 return NOTIFY_DONE;
3278
3279         if (event != USB_EVENT_VBUS) {
3280                 dev_dbg(di->dev, "not a standard host, returning\n");
3281                 return NOTIFY_DONE;
3282         }
3283
3284         /* TODO: State is fabricate  here. See if charger really needs USB
3285          * state or if mA is enough
3286          */
3287         if ((di->usb_state.usb_current == 2) && (mA > 2))
3288                 bm_usb_state = AB8500_BM_USB_STATE_RESUME;
3289         else if (mA == 0)
3290                 bm_usb_state = AB8500_BM_USB_STATE_RESET_HS;
3291         else if (mA == 2)
3292                 bm_usb_state = AB8500_BM_USB_STATE_SUSPEND;
3293         else if (mA >= 8) /* 8, 100, 500 */
3294                 bm_usb_state = AB8500_BM_USB_STATE_CONFIGURED;
3295         else /* Should never occur */
3296                 bm_usb_state = AB8500_BM_USB_STATE_RESET_FS;
3297
3298         dev_dbg(di->dev, "%s usb_state: 0x%02x mA: %d\n",
3299                 __func__, bm_usb_state, mA);
3300
3301         spin_lock(&di->usb_state.usb_lock);
3302         di->usb_state.state_tmp = bm_usb_state;
3303         di->usb_state.usb_current_tmp = mA;
3304         spin_unlock(&di->usb_state.usb_lock);
3305
3306         /*
3307          * wait for some time until you get updates from the usb stack
3308          * and negotiations are completed
3309          */
3310         queue_delayed_work(di->charger_wq, &di->usb_state_changed_work, HZ/2);
3311
3312         return NOTIFY_OK;
3313 }
3314
3315 #if defined(CONFIG_PM)
3316 static int ab8500_charger_resume(struct platform_device *pdev)
3317 {
3318         int ret;
3319         struct ab8500_charger *di = platform_get_drvdata(pdev);
3320
3321         /*
3322          * For ABB revision 1.0 and 1.1 there is a bug in the watchdog
3323          * logic. That means we have to continously kick the charger
3324          * watchdog even when no charger is connected. This is only
3325          * valid once the AC charger has been enabled. This is
3326          * a bug that is not handled by the algorithm and the
3327          * watchdog have to be kicked by the charger driver
3328          * when the AC charger is disabled
3329          */
3330         if (di->ac_conn && is_ab8500_1p1_or_earlier(di->parent)) {
3331                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
3332                         AB8500_CHARG_WD_CTRL, CHARG_WD_KICK);
3333                 if (ret)
3334                         dev_err(di->dev, "Failed to kick WD!\n");
3335
3336                 /* If not already pending start a new timer */
3337                 queue_delayed_work(di->charger_wq, &di->kick_wd_work,
3338                                    round_jiffies(WD_KICK_INTERVAL));
3339         }
3340
3341         /* If we still have a HW failure, schedule a new check */
3342         if (di->flags.mainextchnotok || di->flags.vbus_ovv) {
3343                 queue_delayed_work(di->charger_wq,
3344                         &di->check_hw_failure_work, 0);
3345         }
3346
3347         if (di->flags.vbus_drop_end)
3348                 queue_delayed_work(di->charger_wq, &di->vbus_drop_end_work, 0);
3349
3350         return 0;
3351 }
3352
3353 static int ab8500_charger_suspend(struct platform_device *pdev,
3354         pm_message_t state)
3355 {
3356         struct ab8500_charger *di = platform_get_drvdata(pdev);
3357
3358         /* Cancel any pending jobs */
3359         cancel_delayed_work(&di->check_hw_failure_work);
3360         cancel_delayed_work(&di->vbus_drop_end_work);
3361
3362         flush_delayed_work(&di->attach_work);
3363         flush_delayed_work(&di->usb_charger_attached_work);
3364         flush_delayed_work(&di->ac_charger_attached_work);
3365         flush_delayed_work(&di->check_usbchgnotok_work);
3366         flush_delayed_work(&di->check_vbat_work);
3367         flush_delayed_work(&di->kick_wd_work);
3368
3369         flush_work(&di->usb_link_status_work);
3370         flush_work(&di->ac_work);
3371         flush_work(&di->detect_usb_type_work);
3372
3373         if (atomic_read(&di->current_stepping_sessions))
3374                 return -EAGAIN;
3375
3376         return 0;
3377 }
3378 #else
3379 #define ab8500_charger_suspend      NULL
3380 #define ab8500_charger_resume       NULL
3381 #endif
3382
3383 static struct notifier_block charger_nb = {
3384         .notifier_call = ab8500_external_charger_prepare,
3385 };
3386
3387 static int ab8500_charger_remove(struct platform_device *pdev)
3388 {
3389         struct ab8500_charger *di = platform_get_drvdata(pdev);
3390         int i, irq, ret;
3391
3392         /* Disable AC charging */
3393         ab8500_charger_ac_en(&di->ac_chg, false, 0, 0);
3394
3395         /* Disable USB charging */
3396         ab8500_charger_usb_en(&di->usb_chg, false, 0, 0);
3397
3398         /* Disable interrupts */
3399         for (i = 0; i < ARRAY_SIZE(ab8500_charger_irq); i++) {
3400                 irq = platform_get_irq_byname(pdev, ab8500_charger_irq[i].name);
3401                 free_irq(irq, di);
3402         }
3403
3404         /* Backup battery voltage and current disable */
3405         ret = abx500_mask_and_set_register_interruptible(di->dev,
3406                 AB8500_RTC, AB8500_RTC_CTRL_REG, RTC_BUP_CH_ENA, 0);
3407         if (ret < 0)
3408                 dev_err(di->dev, "%s mask and set failed\n", __func__);
3409
3410         usb_unregister_notifier(di->usb_phy, &di->nb);
3411         usb_put_phy(di->usb_phy);
3412
3413         /* Delete the work queue */
3414         destroy_workqueue(di->charger_wq);
3415
3416         /* Unregister external charger enable notifier */
3417         if (!di->ac_chg.enabled)
3418                 blocking_notifier_chain_unregister(
3419                         &charger_notifier_list, &charger_nb);
3420
3421         flush_scheduled_work();
3422         if (di->usb_chg.enabled)
3423                 power_supply_unregister(&di->usb_chg.psy);
3424
3425         if (di->ac_chg.enabled && !di->ac_chg.external)
3426                 power_supply_unregister(&di->ac_chg.psy);
3427
3428         platform_set_drvdata(pdev, NULL);
3429
3430         return 0;
3431 }
3432
3433 static char *supply_interface[] = {
3434         "ab8500_chargalg",
3435         "ab8500_fg",
3436         "ab8500_btemp",
3437 };
3438
3439 static int ab8500_charger_probe(struct platform_device *pdev)
3440 {
3441         struct device_node *np = pdev->dev.of_node;
3442         struct abx500_bm_data *plat = pdev->dev.platform_data;
3443         struct ab8500_charger *di;
3444         int irq, i, charger_status, ret = 0, ch_stat;
3445
3446         di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
3447         if (!di) {
3448                 dev_err(&pdev->dev, "%s no mem for ab8500_charger\n", __func__);
3449                 return -ENOMEM;
3450         }
3451
3452         if (!plat) {
3453                 dev_err(&pdev->dev, "no battery management data supplied\n");
3454                 return -EINVAL;
3455         }
3456         di->bm = plat;
3457
3458         if (np) {
3459                 ret = ab8500_bm_of_probe(&pdev->dev, np, di->bm);
3460                 if (ret) {
3461                         dev_err(&pdev->dev, "failed to get battery information\n");
3462                         return ret;
3463                 }
3464                 di->autopower_cfg = of_property_read_bool(np, "autopower_cfg");
3465         } else
3466                 di->autopower_cfg = false;
3467
3468         /* get parent data */
3469         di->dev = &pdev->dev;
3470         di->parent = dev_get_drvdata(pdev->dev.parent);
3471         di->gpadc = ab8500_gpadc_get("ab8500-gpadc.0");
3472
3473         /* initialize lock */
3474         spin_lock_init(&di->usb_state.usb_lock);
3475         mutex_init(&di->usb_ipt_crnt_lock);
3476
3477         di->autopower = false;
3478         di->invalid_charger_detect_state = 0;
3479
3480         /* AC supply */
3481         /* power_supply base class */
3482         di->ac_chg.psy.name = "ab8500_ac";
3483         di->ac_chg.psy.type = POWER_SUPPLY_TYPE_MAINS;
3484         di->ac_chg.psy.properties = ab8500_charger_ac_props;
3485         di->ac_chg.psy.num_properties = ARRAY_SIZE(ab8500_charger_ac_props);
3486         di->ac_chg.psy.get_property = ab8500_charger_ac_get_property;
3487         di->ac_chg.psy.supplied_to = supply_interface;
3488         di->ac_chg.psy.num_supplicants = ARRAY_SIZE(supply_interface),
3489         /* ux500_charger sub-class */
3490         di->ac_chg.ops.enable = &ab8500_charger_ac_en;
3491         di->ac_chg.ops.check_enable = &ab8500_charger_ac_check_enable;
3492         di->ac_chg.ops.kick_wd = &ab8500_charger_watchdog_kick;
3493         di->ac_chg.ops.update_curr = &ab8500_charger_update_charger_current;
3494         di->ac_chg.max_out_volt = ab8500_charger_voltage_map[
3495                 ARRAY_SIZE(ab8500_charger_voltage_map) - 1];
3496         di->ac_chg.max_out_curr =
3497                 di->bm->chg_output_curr[di->bm->n_chg_out_curr - 1];
3498         di->ac_chg.wdt_refresh = CHG_WD_INTERVAL;
3499         di->ac_chg.enabled = di->bm->ac_enabled;
3500         di->ac_chg.external = false;
3501
3502         /*notifier for external charger enabling*/
3503         if (!di->ac_chg.enabled)
3504                 blocking_notifier_chain_register(
3505                         &charger_notifier_list, &charger_nb);
3506
3507         /* USB supply */
3508         /* power_supply base class */
3509         di->usb_chg.psy.name = "ab8500_usb";
3510         di->usb_chg.psy.type = POWER_SUPPLY_TYPE_USB;
3511         di->usb_chg.psy.properties = ab8500_charger_usb_props;
3512         di->usb_chg.psy.num_properties = ARRAY_SIZE(ab8500_charger_usb_props);
3513         di->usb_chg.psy.get_property = ab8500_charger_usb_get_property;
3514         di->usb_chg.psy.supplied_to = supply_interface;
3515         di->usb_chg.psy.num_supplicants = ARRAY_SIZE(supply_interface),
3516         /* ux500_charger sub-class */
3517         di->usb_chg.ops.enable = &ab8500_charger_usb_en;
3518         di->usb_chg.ops.check_enable = &ab8500_charger_usb_check_enable;
3519         di->usb_chg.ops.kick_wd = &ab8500_charger_watchdog_kick;
3520         di->usb_chg.ops.update_curr = &ab8500_charger_update_charger_current;
3521         di->usb_chg.ops.pp_enable = &ab8540_charger_power_path_enable;
3522         di->usb_chg.ops.pre_chg_enable = &ab8540_charger_usb_pre_chg_enable;
3523         di->usb_chg.max_out_volt = ab8500_charger_voltage_map[
3524                 ARRAY_SIZE(ab8500_charger_voltage_map) - 1];
3525         di->usb_chg.max_out_curr =
3526                 di->bm->chg_output_curr[di->bm->n_chg_out_curr - 1];
3527         di->usb_chg.wdt_refresh = CHG_WD_INTERVAL;
3528         di->usb_chg.enabled = di->bm->usb_enabled;
3529         di->usb_chg.external = false;
3530         di->usb_chg.power_path = di->bm->usb_power_path;
3531         di->usb_state.usb_current = -1;
3532
3533         /* Create a work queue for the charger */
3534         di->charger_wq =
3535                 create_singlethread_workqueue("ab8500_charger_wq");
3536         if (di->charger_wq == NULL) {
3537                 dev_err(di->dev, "failed to create work queue\n");
3538                 return -ENOMEM;
3539         }
3540
3541         mutex_init(&di->charger_attached_mutex);
3542
3543         /* Init work for HW failure check */
3544         INIT_DEFERRABLE_WORK(&di->check_hw_failure_work,
3545                 ab8500_charger_check_hw_failure_work);
3546         INIT_DEFERRABLE_WORK(&di->check_usbchgnotok_work,
3547                 ab8500_charger_check_usbchargernotok_work);
3548
3549         INIT_DELAYED_WORK(&di->ac_charger_attached_work,
3550                           ab8500_charger_ac_attached_work);
3551         INIT_DELAYED_WORK(&di->usb_charger_attached_work,
3552                           ab8500_charger_usb_attached_work);
3553
3554         /*
3555          * For ABB revision 1.0 and 1.1 there is a bug in the watchdog
3556          * logic. That means we have to continously kick the charger
3557          * watchdog even when no charger is connected. This is only
3558          * valid once the AC charger has been enabled. This is
3559          * a bug that is not handled by the algorithm and the
3560          * watchdog have to be kicked by the charger driver
3561          * when the AC charger is disabled
3562          */
3563         INIT_DEFERRABLE_WORK(&di->kick_wd_work,
3564                 ab8500_charger_kick_watchdog_work);
3565
3566         INIT_DEFERRABLE_WORK(&di->check_vbat_work,
3567                 ab8500_charger_check_vbat_work);
3568
3569         INIT_DELAYED_WORK(&di->attach_work,
3570                 ab8500_charger_usb_link_attach_work);
3571
3572         INIT_DELAYED_WORK(&di->usb_state_changed_work,
3573                 ab8500_charger_usb_state_changed_work);
3574
3575         INIT_DELAYED_WORK(&di->vbus_drop_end_work,
3576                 ab8500_charger_vbus_drop_end_work);
3577
3578         /* Init work for charger detection */
3579         INIT_WORK(&di->usb_link_status_work,
3580                 ab8500_charger_usb_link_status_work);
3581         INIT_WORK(&di->ac_work, ab8500_charger_ac_work);
3582         INIT_WORK(&di->detect_usb_type_work,
3583                 ab8500_charger_detect_usb_type_work);
3584
3585         /* Init work for checking HW status */
3586         INIT_WORK(&di->check_main_thermal_prot_work,
3587                 ab8500_charger_check_main_thermal_prot_work);
3588         INIT_WORK(&di->check_usb_thermal_prot_work,
3589                 ab8500_charger_check_usb_thermal_prot_work);
3590
3591         /*
3592          * VDD ADC supply needs to be enabled from this driver when there
3593          * is a charger connected to avoid erroneous BTEMP_HIGH/LOW
3594          * interrupts during charging
3595          */
3596         di->regu = devm_regulator_get(di->dev, "vddadc");
3597         if (IS_ERR(di->regu)) {
3598                 ret = PTR_ERR(di->regu);
3599                 dev_err(di->dev, "failed to get vddadc regulator\n");
3600                 goto free_charger_wq;
3601         }
3602
3603
3604         /* Initialize OVV, and other registers */
3605         ret = ab8500_charger_init_hw_registers(di);
3606         if (ret) {
3607                 dev_err(di->dev, "failed to initialize ABB registers\n");
3608                 goto free_charger_wq;
3609         }
3610
3611         /* Register AC charger class */
3612         if (di->ac_chg.enabled) {
3613                 ret = power_supply_register(di->dev, &di->ac_chg.psy);
3614                 if (ret) {
3615                         dev_err(di->dev, "failed to register AC charger\n");
3616                         goto free_charger_wq;
3617                 }
3618         }
3619
3620         /* Register USB charger class */
3621         if (di->usb_chg.enabled) {
3622                 ret = power_supply_register(di->dev, &di->usb_chg.psy);
3623                 if (ret) {
3624                         dev_err(di->dev, "failed to register USB charger\n");
3625                         goto free_ac;
3626                 }
3627         }
3628
3629         di->usb_phy = usb_get_phy(USB_PHY_TYPE_USB2);
3630         if (IS_ERR_OR_NULL(di->usb_phy)) {
3631                 dev_err(di->dev, "failed to get usb transceiver\n");
3632                 ret = -EINVAL;
3633                 goto free_usb;
3634         }
3635         di->nb.notifier_call = ab8500_charger_usb_notifier_call;
3636         ret = usb_register_notifier(di->usb_phy, &di->nb);
3637         if (ret) {
3638                 dev_err(di->dev, "failed to register usb notifier\n");
3639                 goto put_usb_phy;
3640         }
3641
3642         /* Identify the connected charger types during startup */
3643         charger_status = ab8500_charger_detect_chargers(di, true);
3644         if (charger_status & AC_PW_CONN) {
3645                 di->ac.charger_connected = 1;
3646                 di->ac_conn = true;
3647                 ab8500_power_supply_changed(di, &di->ac_chg.psy);
3648                 sysfs_notify(&di->ac_chg.psy.dev->kobj, NULL, "present");
3649         }
3650
3651         if (charger_status & USB_PW_CONN) {
3652                 di->vbus_detected = true;
3653                 di->vbus_detected_start = true;
3654                 queue_work(di->charger_wq,
3655                         &di->detect_usb_type_work);
3656         }
3657
3658         /* Register interrupts */
3659         for (i = 0; i < ARRAY_SIZE(ab8500_charger_irq); i++) {
3660                 irq = platform_get_irq_byname(pdev, ab8500_charger_irq[i].name);
3661                 ret = request_threaded_irq(irq, NULL, ab8500_charger_irq[i].isr,
3662                         IRQF_SHARED | IRQF_NO_SUSPEND,
3663                         ab8500_charger_irq[i].name, di);
3664
3665                 if (ret != 0) {
3666                         dev_err(di->dev, "failed to request %s IRQ %d: %d\n"
3667                                 , ab8500_charger_irq[i].name, irq, ret);
3668                         goto free_irq;
3669                 }
3670                 dev_dbg(di->dev, "Requested %s IRQ %d: %d\n",
3671                         ab8500_charger_irq[i].name, irq, ret);
3672         }
3673
3674         platform_set_drvdata(pdev, di);
3675
3676         mutex_lock(&di->charger_attached_mutex);
3677
3678         ch_stat = ab8500_charger_detect_chargers(di, false);
3679
3680         if ((ch_stat & AC_PW_CONN) == AC_PW_CONN) {
3681                 if (is_ab8500(di->parent))
3682                         queue_delayed_work(di->charger_wq,
3683                                            &di->ac_charger_attached_work,
3684                                            HZ);
3685         }
3686         if ((ch_stat & USB_PW_CONN) == USB_PW_CONN) {
3687                 if (is_ab8500(di->parent))
3688                         queue_delayed_work(di->charger_wq,
3689                                            &di->usb_charger_attached_work,
3690                                            HZ);
3691         }
3692
3693         mutex_unlock(&di->charger_attached_mutex);
3694
3695         return ret;
3696
3697 free_irq:
3698         usb_unregister_notifier(di->usb_phy, &di->nb);
3699
3700         /* We also have to free all successfully registered irqs */
3701         for (i = i - 1; i >= 0; i--) {
3702                 irq = platform_get_irq_byname(pdev, ab8500_charger_irq[i].name);
3703                 free_irq(irq, di);
3704         }
3705 put_usb_phy:
3706         usb_put_phy(di->usb_phy);
3707 free_usb:
3708         if (di->usb_chg.enabled)
3709                 power_supply_unregister(&di->usb_chg.psy);
3710 free_ac:
3711         if (di->ac_chg.enabled)
3712                 power_supply_unregister(&di->ac_chg.psy);
3713 free_charger_wq:
3714         destroy_workqueue(di->charger_wq);
3715         return ret;
3716 }
3717
3718 static const struct of_device_id ab8500_charger_match[] = {
3719         { .compatible = "stericsson,ab8500-charger", },
3720         { },
3721 };
3722
3723 static struct platform_driver ab8500_charger_driver = {
3724         .probe = ab8500_charger_probe,
3725         .remove = ab8500_charger_remove,
3726         .suspend = ab8500_charger_suspend,
3727         .resume = ab8500_charger_resume,
3728         .driver = {
3729                 .name = "ab8500-charger",
3730                 .owner = THIS_MODULE,
3731                 .of_match_table = ab8500_charger_match,
3732         },
3733 };
3734
3735 static int __init ab8500_charger_init(void)
3736 {
3737         return platform_driver_register(&ab8500_charger_driver);
3738 }
3739
3740 static void __exit ab8500_charger_exit(void)
3741 {
3742         platform_driver_unregister(&ab8500_charger_driver);
3743 }
3744
3745 subsys_initcall_sync(ab8500_charger_init);
3746 module_exit(ab8500_charger_exit);
3747
3748 MODULE_LICENSE("GPL v2");
3749 MODULE_AUTHOR("Johan Palsson, Karl Komierowski, Arun R Murthy");
3750 MODULE_ALIAS("platform:ab8500-charger");
3751 MODULE_DESCRIPTION("AB8500 charger management driver");