drivers/power/axp288_charger.c

   1 /*
   2  * axp288_charger.c - X-power AXP288 PMIC Charger driver
   3  *
   4  * Copyright (C) 2014 Intel Corporation
   5  * Author: Ramakrishna Pallala <ramakrishna.pallala@intel.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  */
  16
  17 #include <linux/module.h>
  18 #include <linux/device.h>
  19 #include <linux/regmap.h>
  20 #include <linux/workqueue.h>
  21 #include <linux/delay.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/usb/otg.h>
  24 #include <linux/notifier.h>
  25 #include <linux/power_supply.h>
  26 #include <linux/notifier.h>
  27 #include <linux/property.h>
  28 #include <linux/mfd/axp20x.h>
  29 #include <linux/extcon.h>
  30
  31 #define PS_STAT_VBUS_TRIGGER            (1 << 0)
  32 #define PS_STAT_BAT_CHRG_DIR            (1 << 2)
  33 #define PS_STAT_VBAT_ABOVE_VHOLD        (1 << 3)
  34 #define PS_STAT_VBUS_VALID              (1 << 4)
  35 #define PS_STAT_VBUS_PRESENT            (1 << 5)
  36
  37 #define CHRG_STAT_BAT_SAFE_MODE         (1 << 3)
  38 #define CHRG_STAT_BAT_VALID             (1 << 4)
  39 #define CHRG_STAT_BAT_PRESENT           (1 << 5)
  40 #define CHRG_STAT_CHARGING              (1 << 6)
  41 #define CHRG_STAT_PMIC_OTP              (1 << 7)
  42
  43 #define VBUS_ISPOUT_CUR_LIM_MASK        0x03
  44 #define VBUS_ISPOUT_CUR_LIM_BIT_POS     0
  45 #define VBUS_ISPOUT_CUR_LIM_900MA       0x0     /* 900mA */
  46 #define VBUS_ISPOUT_CUR_LIM_1500MA      0x1     /* 1500mA */
  47 #define VBUS_ISPOUT_CUR_LIM_2000MA      0x2     /* 2000mA */
  48 #define VBUS_ISPOUT_CUR_NO_LIM          0x3     /* 2500mA */
  49 #define VBUS_ISPOUT_VHOLD_SET_MASK      0x31
  50 #define VBUS_ISPOUT_VHOLD_SET_BIT_POS   0x3
  51 #define VBUS_ISPOUT_VHOLD_SET_OFFSET    4000    /* 4000mV */
  52 #define VBUS_ISPOUT_VHOLD_SET_LSB_RES   100     /* 100mV */
  53 #define VBUS_ISPOUT_VHOLD_SET_4300MV    0x3     /* 4300mV */
  54 #define VBUS_ISPOUT_VBUS_PATH_DIS       (1 << 7)
  55
  56 #define CHRG_CCCV_CC_MASK               0xf             /* 4 bits */
  57 #define CHRG_CCCV_CC_BIT_POS            0
  58 #define CHRG_CCCV_CC_OFFSET             200             /* 200mA */
  59 #define CHRG_CCCV_CC_LSB_RES            200             /* 200mA */
  60 #define CHRG_CCCV_ITERM_20P             (1 << 4)        /* 20% of CC */
  61 #define CHRG_CCCV_CV_MASK               0x60            /* 2 bits */
  62 #define CHRG_CCCV_CV_BIT_POS            5
  63 #define CHRG_CCCV_CV_4100MV             0x0             /* 4.10V */
  64 #define CHRG_CCCV_CV_4150MV             0x1             /* 4.15V */
  65 #define CHRG_CCCV_CV_4200MV             0x2             /* 4.20V */
  66 #define CHRG_CCCV_CV_4350MV             0x3             /* 4.35V */
  67 #define CHRG_CCCV_CHG_EN                (1 << 7)
  68
  69 #define CNTL2_CC_TIMEOUT_MASK           0x3     /* 2 bits */
  70 #define CNTL2_CC_TIMEOUT_OFFSET         6       /* 6 Hrs */
  71 #define CNTL2_CC_TIMEOUT_LSB_RES        2       /* 2 Hrs */
  72 #define CNTL2_CC_TIMEOUT_12HRS          0x3     /* 12 Hrs */
  73 #define CNTL2_CHGLED_TYPEB              (1 << 4)
  74 #define CNTL2_CHG_OUT_TURNON            (1 << 5)
  75 #define CNTL2_PC_TIMEOUT_MASK           0xC0
  76 #define CNTL2_PC_TIMEOUT_OFFSET         40      /* 40 mins */
  77 #define CNTL2_PC_TIMEOUT_LSB_RES        10      /* 10 mins */
  78 #define CNTL2_PC_TIMEOUT_70MINS         0x3
  79
  80 #define CHRG_ILIM_TEMP_LOOP_EN          (1 << 3)
  81 #define CHRG_VBUS_ILIM_MASK             0xf0
  82 #define CHRG_VBUS_ILIM_BIT_POS          4
  83 #define CHRG_VBUS_ILIM_100MA            0x0     /* 100mA */
  84 #define CHRG_VBUS_ILIM_500MA            0x1     /* 500mA */
  85 #define CHRG_VBUS_ILIM_900MA            0x2     /* 900mA */
  86 #define CHRG_VBUS_ILIM_1500MA           0x3     /* 1500mA */
  87 #define CHRG_VBUS_ILIM_2000MA           0x4     /* 2000mA */
  88 #define CHRG_VBUS_ILIM_2500MA           0x5     /* 2500mA */
  89 #define CHRG_VBUS_ILIM_3000MA           0x6     /* 3000mA */
  90
  91 #define CHRG_VLTFC_0C                   0xA5    /* 0 DegC */
  92 #define CHRG_VHTFC_45C                  0x1F    /* 45 DegC */
  93
  94 #define BAT_IRQ_CFG_CHRG_DONE           (1 << 2)
  95 #define BAT_IRQ_CFG_CHRG_START          (1 << 3)
  96 #define BAT_IRQ_CFG_BAT_SAFE_EXIT       (1 << 4)
  97 #define BAT_IRQ_CFG_BAT_SAFE_ENTER      (1 << 5)
  98 #define BAT_IRQ_CFG_BAT_DISCON          (1 << 6)
  99 #define BAT_IRQ_CFG_BAT_CONN            (1 << 7)
 100 #define BAT_IRQ_CFG_BAT_MASK            0xFC
 101
 102 #define TEMP_IRQ_CFG_QCBTU              (1 << 4)
 103 #define TEMP_IRQ_CFG_CBTU               (1 << 5)
 104 #define TEMP_IRQ_CFG_QCBTO              (1 << 6)
 105 #define TEMP_IRQ_CFG_CBTO               (1 << 7)
 106 #define TEMP_IRQ_CFG_MASK               0xF0
 107
 108 #define FG_CNTL_OCV_ADJ_EN              (1 << 3)
 109
 110 #define CV_4100MV                       4100    /* 4100mV */
 111 #define CV_4150MV                       4150    /* 4150mV */
 112 #define CV_4200MV                       4200    /* 4200mV */
 113 #define CV_4350MV                       4350    /* 4350mV */
 114
 115 #define CC_200MA                        200     /*  200mA */
 116 #define CC_600MA                        600     /*  600mA */
 117 #define CC_800MA                        800     /*  800mA */
 118 #define CC_1000MA                       1000    /* 1000mA */
 119 #define CC_1600MA                       1600    /* 1600mA */
 120 #define CC_2000MA                       2000    /* 2000mA */
 121
 122 #define ILIM_100MA                      100     /* 100mA */
 123 #define ILIM_500MA                      500     /* 500mA */
 124 #define ILIM_900MA                      900     /* 900mA */
 125 #define ILIM_1500MA                     1500    /* 1500mA */
 126 #define ILIM_2000MA                     2000    /* 2000mA */
 127 #define ILIM_2500MA                     2500    /* 2500mA */
 128 #define ILIM_3000MA                     3000    /* 3000mA */
 129
 130 #define AXP288_EXTCON_DEV_NAME          "axp288_extcon"
 131
 132 #define AXP288_EXTCON_SLOW_CHARGER              "SLOW-CHARGER"
 133 #define AXP288_EXTCON_DOWNSTREAM_CHARGER        "CHARGE-DOWNSTREAM"
 134 #define AXP288_EXTCON_FAST_CHARGER              "FAST-CHARGER"
 135
 136 enum {
 137         VBUS_OV_IRQ = 0,
 138         CHARGE_DONE_IRQ,
 139         CHARGE_CHARGING_IRQ,
 140         BAT_SAFE_QUIT_IRQ,
 141         BAT_SAFE_ENTER_IRQ,
 142         QCBTU_IRQ,
 143         CBTU_IRQ,
 144         QCBTO_IRQ,
 145         CBTO_IRQ,
 146         CHRG_INTR_END,
 147 };
 148
 149 struct axp288_chrg_info {
 150         struct platform_device *pdev;
 151         struct axp20x_chrg_pdata *pdata;
 152         struct regmap *regmap;
 153         struct regmap_irq_chip_data *regmap_irqc;
 154         int irq[CHRG_INTR_END];
 155         struct power_supply *psy_usb;
 156         struct mutex lock;
 157
 158         /* OTG/Host mode */
 159         struct {
 160                 struct work_struct work;
 161                 struct extcon_specific_cable_nb cable;
 162                 struct notifier_block id_nb;
 163                 bool id_short;
 164         } otg;
 165
 166         /* SDP/CDP/DCP USB charging cable notifications */
 167         struct {
 168                 struct extcon_dev *edev;
 169                 bool connected;
 170                 enum power_supply_type chg_type;
 171                 struct notifier_block nb;
 172                 struct work_struct work;
 173         } cable;
 174
 175         int health;
 176         int inlmt;
 177         int cc;
 178         int cv;
 179         int max_cc;
 180         int max_cv;
 181         bool online;
 182         bool present;
 183         bool enable_charger;
 184         bool is_charger_enabled;
 185 };
 186
 187 static inline int axp288_charger_set_cc(struct axp288_chrg_info *info, int cc)
 188 {
 189         u8 reg_val;
 190         int ret;
 191
 192         if (cc < CHRG_CCCV_CC_OFFSET)
 193                 cc = CHRG_CCCV_CC_OFFSET;
 194         else if (cc > info->max_cc)
 195                 cc = info->max_cc;
 196
 197         reg_val = (cc - CHRG_CCCV_CC_OFFSET) / CHRG_CCCV_CC_LSB_RES;
 198         cc = (reg_val * CHRG_CCCV_CC_LSB_RES) + CHRG_CCCV_CC_OFFSET;
 199         reg_val = reg_val << CHRG_CCCV_CC_BIT_POS;
 200
 201         ret = regmap_update_bits(info->regmap,
 202                                 AXP20X_CHRG_CTRL1,
 203                                 CHRG_CCCV_CC_MASK, reg_val);
 204         if (ret >= 0)
 205                 info->cc = cc;
 206
 207         return ret;
 208 }
 209
 210 static inline int axp288_charger_set_cv(struct axp288_chrg_info *info, int cv)
 211 {
 212         u8 reg_val;
 213         int ret;
 214
 215         if (cv <= CV_4100MV) {
 216                 reg_val = CHRG_CCCV_CV_4100MV;
 217                 cv = CV_4100MV;
 218         } else if (cv <= CV_4150MV) {
 219                 reg_val = CHRG_CCCV_CV_4150MV;
 220                 cv = CV_4150MV;
 221         } else if (cv <= CV_4200MV) {
 222                 reg_val = CHRG_CCCV_CV_4200MV;
 223                 cv = CV_4200MV;
 224         } else {
 225                 reg_val = CHRG_CCCV_CV_4350MV;
 226                 cv = CV_4350MV;
 227         }
 228
 229         reg_val = reg_val << CHRG_CCCV_CV_BIT_POS;
 230
 231         ret = regmap_update_bits(info->regmap,
 232                                 AXP20X_CHRG_CTRL1,
 233                                 CHRG_CCCV_CV_MASK, reg_val);
 234
 235         if (ret >= 0)
 236                 info->cv = cv;
 237
 238         return ret;
 239 }
 240
 241 static inline int axp288_charger_set_vbus_inlmt(struct axp288_chrg_info *info,
 242                                            int inlmt)
 243 {
 244         int ret;
 245         unsigned int val;
 246         u8 reg_val;
 247
 248         /* Read in limit register */
 249         ret = regmap_read(info->regmap, AXP20X_CHRG_BAK_CTRL, &val);
 250         if (ret < 0)
 251                 goto set_inlmt_fail;
 252
 253         if (inlmt <= ILIM_100MA) {
 254                 reg_val = CHRG_VBUS_ILIM_100MA;
 255                 inlmt = ILIM_100MA;
 256         } else if (inlmt <= ILIM_500MA) {
 257                 reg_val = CHRG_VBUS_ILIM_500MA;
 258                 inlmt = ILIM_500MA;
 259         } else if (inlmt <= ILIM_900MA) {
 260                 reg_val = CHRG_VBUS_ILIM_900MA;
 261                 inlmt = ILIM_900MA;
 262         } else if (inlmt <= ILIM_1500MA) {
 263                 reg_val = CHRG_VBUS_ILIM_1500MA;
 264                 inlmt = ILIM_1500MA;
 265         } else if (inlmt <= ILIM_2000MA) {
 266                 reg_val = CHRG_VBUS_ILIM_2000MA;
 267                 inlmt = ILIM_2000MA;
 268         } else if (inlmt <= ILIM_2500MA) {
 269                 reg_val = CHRG_VBUS_ILIM_2500MA;
 270                 inlmt = ILIM_2500MA;
 271         } else {
 272                 reg_val = CHRG_VBUS_ILIM_3000MA;
 273                 inlmt = ILIM_3000MA;
 274         }
 275
 276         reg_val = (val & ~CHRG_VBUS_ILIM_MASK)
 277                         | (reg_val << CHRG_VBUS_ILIM_BIT_POS);
 278         ret = regmap_write(info->regmap, AXP20X_CHRG_BAK_CTRL, reg_val);
 279         if (ret >= 0)
 280                 info->inlmt = inlmt;
 281         else
 282                 dev_err(&info->pdev->dev, "charger BAK control %d\n", ret);
 283
 284
 285 set_inlmt_fail:
 286         return ret;
 287 }
 288
 289 static int axp288_charger_vbus_path_select(struct axp288_chrg_info *info,
 290                                                                 bool enable)
 291 {
 292         int ret;
 293
 294         if (enable)
 295                 ret = regmap_update_bits(info->regmap, AXP20X_VBUS_IPSOUT_MGMT,
 296                                         VBUS_ISPOUT_VBUS_PATH_DIS, 0);
 297         else
 298                 ret = regmap_update_bits(info->regmap, AXP20X_VBUS_IPSOUT_MGMT,
 299                         VBUS_ISPOUT_VBUS_PATH_DIS, VBUS_ISPOUT_VBUS_PATH_DIS);
 300
 301         if (ret < 0)
 302                 dev_err(&info->pdev->dev, "axp288 vbus path select %d\n", ret);
 303
 304
 305         return ret;
 306 }
 307
 308 static int axp288_charger_enable_charger(struct axp288_chrg_info *info,
 309                                                                 bool enable)
 310 {
 311         int ret;
 312
 313         if (enable)
 314                 ret = regmap_update_bits(info->regmap, AXP20X_CHRG_CTRL1,
 315                                 CHRG_CCCV_CHG_EN, CHRG_CCCV_CHG_EN);
 316         else
 317                 ret = regmap_update_bits(info->regmap, AXP20X_CHRG_CTRL1,
 318                                 CHRG_CCCV_CHG_EN, 0);
 319         if (ret < 0)
 320                 dev_err(&info->pdev->dev, "axp288 enable charger %d\n", ret);
 321         else
 322                 info->is_charger_enabled = enable;
 323
 324         return ret;
 325 }
 326
 327 static int axp288_charger_is_present(struct axp288_chrg_info *info)
 328 {
 329         int ret, present = 0;
 330         unsigned int val;
 331
 332         ret = regmap_read(info->regmap, AXP20X_PWR_INPUT_STATUS, &val);
 333         if (ret < 0)
 334                 return ret;
 335
 336         if (val & PS_STAT_VBUS_PRESENT)
 337                 present = 1;
 338         return present;
 339 }
 340
 341 static int axp288_charger_is_online(struct axp288_chrg_info *info)
 342 {
 343         int ret, online = 0;
 344         unsigned int val;
 345
 346         ret = regmap_read(info->regmap, AXP20X_PWR_INPUT_STATUS, &val);
 347         if (ret < 0)
 348                 return ret;
 349
 350         if (val & PS_STAT_VBUS_VALID)
 351                 online = 1;
 352         return online;
 353 }
 354
 355 static int axp288_get_charger_health(struct axp288_chrg_info *info)
 356 {
 357         int ret, pwr_stat, chrg_stat;
 358         int health = POWER_SUPPLY_HEALTH_UNKNOWN;
 359         unsigned int val;
 360
 361         ret = regmap_read(info->regmap, AXP20X_PWR_INPUT_STATUS, &val);
 362         if ((ret < 0) || !(val & PS_STAT_VBUS_PRESENT))
 363                 goto health_read_fail;
 364         else
 365                 pwr_stat = val;
 366
 367         ret = regmap_read(info->regmap, AXP20X_PWR_OP_MODE, &val);
 368         if (ret < 0)
 369                 goto health_read_fail;
 370         else
 371                 chrg_stat = val;
 372
 373         if (!(pwr_stat & PS_STAT_VBUS_VALID))
 374                 health = POWER_SUPPLY_HEALTH_DEAD;
 375         else if (chrg_stat & CHRG_STAT_PMIC_OTP)
 376                 health = POWER_SUPPLY_HEALTH_OVERHEAT;
 377         else if (chrg_stat & CHRG_STAT_BAT_SAFE_MODE)
 378                 health = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE;
 379         else
 380                 health = POWER_SUPPLY_HEALTH_GOOD;
 381
 382 health_read_fail:
 383         return health;
 384 }
 385
 386 static int axp288_charger_usb_set_property(struct power_supply *psy,
 387                                     enum power_supply_property psp,
 388                                     const union power_supply_propval *val)
 389 {
 390         struct axp288_chrg_info *info = power_supply_get_drvdata(psy);
 391         int ret = 0;
 392         int scaled_val;
 393
 394         mutex_lock(&info->lock);
 395
 396         switch (psp) {
 397         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
 398                 scaled_val = min(val->intval, info->max_cc);
 399                 scaled_val = DIV_ROUND_CLOSEST(scaled_val, 1000);
 400                 ret = axp288_charger_set_cc(info, scaled_val);
 401                 if (ret < 0)
 402                         dev_warn(&info->pdev->dev, "set charge current failed\n");
 403                 break;
 404         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
 405                 scaled_val = min(val->intval, info->max_cv);
 406                 scaled_val = DIV_ROUND_CLOSEST(scaled_val, 1000);
 407                 ret = axp288_charger_set_cv(info, scaled_val);
 408                 if (ret < 0)
 409                         dev_warn(&info->pdev->dev, "set charge voltage failed\n");
 410                 break;
 411         default:
 412                 ret = -EINVAL;
 413         }
 414
 415         mutex_unlock(&info->lock);
 416         return ret;
 417 }
 418
 419 static int axp288_charger_usb_get_property(struct power_supply *psy,
 420                                     enum power_supply_property psp,
 421                                     union power_supply_propval *val)
 422 {
 423         struct axp288_chrg_info *info = power_supply_get_drvdata(psy);
 424         int ret = 0;
 425
 426         mutex_lock(&info->lock);
 427
 428         switch (psp) {
 429         case POWER_SUPPLY_PROP_PRESENT:
 430                 /* Check for OTG case first */
 431                 if (info->otg.id_short) {
 432                         val->intval = 0;
 433                         break;
 434                 }
 435                 ret = axp288_charger_is_present(info);
 436                 if (ret < 0)
 437                         goto psy_get_prop_fail;
 438                 info->present = ret;
 439                 val->intval = info->present;
 440                 break;
 441         case POWER_SUPPLY_PROP_ONLINE:
 442                 /* Check for OTG case first */
 443                 if (info->otg.id_short) {
 444                         val->intval = 0;
 445                         break;
 446                 }
 447                 ret = axp288_charger_is_online(info);
 448                 if (ret < 0)
 449                         goto psy_get_prop_fail;
 450                 info->online = ret;
 451                 val->intval = info->online;
 452                 break;
 453         case POWER_SUPPLY_PROP_HEALTH:
 454                 val->intval = axp288_get_charger_health(info);
 455                 break;
 456         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
 457                 val->intval = info->cc * 1000;
 458                 break;
 459         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
 460                 val->intval = info->max_cc * 1000;
 461                 break;
 462         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
 463                 val->intval = info->cv * 1000;
 464                 break;
 465         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
 466                 val->intval = info->max_cv * 1000;
 467                 break;
 468         case POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT:
 469                 val->intval = info->inlmt * 1000;
 470                 break;
 471         default:
 472                 ret = -EINVAL;
 473                 goto psy_get_prop_fail;
 474         }
 475
 476 psy_get_prop_fail:
 477         mutex_unlock(&info->lock);
 478         return ret;
 479 }
 480
 481 static int axp288_charger_property_is_writeable(struct power_supply *psy,
 482                 enum power_supply_property psp)
 483 {
 484         int ret;
 485
 486         switch (psp) {
 487         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
 488         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
 489                 ret = 1;
 490                 break;
 491         default:
 492                 ret = 0;
 493         }
 494
 495         return ret;
 496 }
 497
 498 static enum power_supply_property axp288_usb_props[] = {
 499         POWER_SUPPLY_PROP_PRESENT,
 500         POWER_SUPPLY_PROP_ONLINE,
 501         POWER_SUPPLY_PROP_TYPE,
 502         POWER_SUPPLY_PROP_HEALTH,
 503         POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
 504         POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
 505         POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
 506         POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
 507         POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT,
 508 };
 509
 510 static const struct power_supply_desc axp288_charger_desc = {
 511         .name                   = "axp288_charger",
 512         .type                   = POWER_SUPPLY_TYPE_USB,
 513         .properties             = axp288_usb_props,
 514         .num_properties         = ARRAY_SIZE(axp288_usb_props),
 515         .get_property           = axp288_charger_usb_get_property,
 516         .set_property           = axp288_charger_usb_set_property,
 517         .property_is_writeable  = axp288_charger_property_is_writeable,
 518 };
 519
 520 static irqreturn_t axp288_charger_irq_thread_handler(int irq, void *dev)
 521 {
 522         struct axp288_chrg_info *info = dev;
 523         int i;
 524
 525         for (i = 0; i < CHRG_INTR_END; i++) {
 526                 if (info->irq[i] == irq)
 527                         break;
 528         }
 529
 530         if (i >= CHRG_INTR_END) {
 531                 dev_warn(&info->pdev->dev, "spurious interrupt!!\n");
 532                 return IRQ_NONE;
 533         }
 534
 535         switch (i) {
 536         case VBUS_OV_IRQ:
 537                 dev_dbg(&info->pdev->dev, "VBUS Over Voltage INTR\n");
 538                 break;
 539         case CHARGE_DONE_IRQ:
 540                 dev_dbg(&info->pdev->dev, "Charging Done INTR\n");
 541                 break;
 542         case CHARGE_CHARGING_IRQ:
 543                 dev_dbg(&info->pdev->dev, "Start Charging IRQ\n");
 544                 break;
 545         case BAT_SAFE_QUIT_IRQ:
 546                 dev_dbg(&info->pdev->dev,
 547                         "Quit Safe Mode(restart timer) Charging IRQ\n");
 548                 break;
 549         case BAT_SAFE_ENTER_IRQ:
 550                 dev_dbg(&info->pdev->dev,
 551                         "Enter Safe Mode(timer expire) Charging IRQ\n");
 552                 break;
 553         case QCBTU_IRQ:
 554                 dev_dbg(&info->pdev->dev,
 555                         "Quit Battery Under Temperature(CHRG) INTR\n");
 556                 break;
 557         case CBTU_IRQ:
 558                 dev_dbg(&info->pdev->dev,
 559                         "Hit Battery Under Temperature(CHRG) INTR\n");
 560                 break;
 561         case QCBTO_IRQ:
 562                 dev_dbg(&info->pdev->dev,
 563                         "Quit Battery Over Temperature(CHRG) INTR\n");
 564                 break;
 565         case CBTO_IRQ:
 566                 dev_dbg(&info->pdev->dev,
 567                         "Hit Battery Over Temperature(CHRG) INTR\n");
 568                 break;
 569         default:
 570                 dev_warn(&info->pdev->dev, "Spurious Interrupt!!!\n");
 571                 goto out;
 572         }
 573
 574         power_supply_changed(info->psy_usb);
 575 out:
 576         return IRQ_HANDLED;
 577 }
 578
 579 static void axp288_charger_extcon_evt_worker(struct work_struct *work)
 580 {
 581         struct axp288_chrg_info *info =
 582             container_of(work, struct axp288_chrg_info, cable.work);
 583         int ret, current_limit;
 584         bool changed = false;
 585         struct extcon_dev *edev = info->cable.edev;
 586         bool old_connected = info->cable.connected;
 587
 588         /* Determine cable/charger type */
 589         if (extcon_get_cable_state(edev, AXP288_EXTCON_SLOW_CHARGER) > 0) {
 590                 dev_dbg(&info->pdev->dev, "USB SDP charger  is connected");
 591                 info->cable.connected = true;
 592                 info->cable.chg_type = POWER_SUPPLY_TYPE_USB;
 593         } else if (extcon_get_cable_state(edev,
 594                                 AXP288_EXTCON_DOWNSTREAM_CHARGER) > 0) {
 595                 dev_dbg(&info->pdev->dev, "USB CDP charger is connected");
 596                 info->cable.connected = true;
 597                 info->cable.chg_type = POWER_SUPPLY_TYPE_USB_CDP;
 598         } else if (extcon_get_cable_state(edev,
 599                                         AXP288_EXTCON_FAST_CHARGER) > 0) {
 600                 dev_dbg(&info->pdev->dev, "USB DCP charger is connected");
 601                 info->cable.connected = true;
 602                 info->cable.chg_type = POWER_SUPPLY_TYPE_USB_DCP;
 603         } else {
 604                 if (old_connected)
 605                         dev_dbg(&info->pdev->dev, "USB charger disconnected");
 606                 info->cable.connected = false;
 607                 info->cable.chg_type = POWER_SUPPLY_TYPE_USB;
 608         }
 609
 610         /* Cable status changed */
 611         if (old_connected != info->cable.connected)
 612                 changed = true;
 613
 614         if (!changed)
 615                 return;
 616
 617         mutex_lock(&info->lock);
 618
 619         if (info->is_charger_enabled && !info->cable.connected) {
 620                 info->enable_charger = false;
 621                 ret = axp288_charger_enable_charger(info, info->enable_charger);
 622                 if (ret < 0)
 623                         dev_err(&info->pdev->dev,
 624                                 "cannot disable charger (%d)", ret);
 625
 626         } else if (!info->is_charger_enabled && info->cable.connected) {
 627                 switch (info->cable.chg_type) {
 628                 case POWER_SUPPLY_TYPE_USB:
 629                         current_limit = ILIM_500MA;
 630                         break;
 631                 case POWER_SUPPLY_TYPE_USB_CDP:
 632                         current_limit = ILIM_1500MA;
 633                         break;
 634                 case POWER_SUPPLY_TYPE_USB_DCP:
 635                         current_limit = ILIM_2000MA;
 636                         break;
 637                 default:
 638                         /* Unknown */
 639                         current_limit = 0;
 640                         break;
 641                 }
 642
 643                 /* Set vbus current limit first, then enable charger */
 644                 ret = axp288_charger_set_vbus_inlmt(info, current_limit);
 645                 if (ret < 0) {
 646                         dev_err(&info->pdev->dev,
 647                                 "error setting current limit (%d)", ret);
 648                 } else {
 649                         info->enable_charger = (current_limit > 0);
 650                         ret = axp288_charger_enable_charger(info,
 651                                                         info->enable_charger);
 652                         if (ret < 0)
 653                                 dev_err(&info->pdev->dev,
 654                                         "cannot enable charger (%d)", ret);
 655                 }
 656         }
 657
 658         if (changed)
 659                 info->health = axp288_get_charger_health(info);
 660
 661         mutex_unlock(&info->lock);
 662
 663         if (changed)
 664                 power_supply_changed(info->psy_usb);
 665 }
 666
 667 static int axp288_charger_handle_cable_evt(struct notifier_block *nb,
 668                                           unsigned long event, void *param)
 669 {
 670         struct axp288_chrg_info *info =
 671             container_of(nb, struct axp288_chrg_info, cable.nb);
 672
 673         schedule_work(&info->cable.work);
 674
 675         return NOTIFY_OK;
 676 }
 677
 678 static void axp288_charger_otg_evt_worker(struct work_struct *work)
 679 {
 680         struct axp288_chrg_info *info =
 681             container_of(work, struct axp288_chrg_info, otg.work);
 682         int ret;
 683
 684         /* Disable VBUS path before enabling the 5V boost */
 685         ret = axp288_charger_vbus_path_select(info, !info->otg.id_short);
 686         if (ret < 0)
 687                 dev_warn(&info->pdev->dev, "vbus path disable failed\n");
 688 }
 689
 690 static int axp288_charger_handle_otg_evt(struct notifier_block *nb,
 691                                    unsigned long event, void *param)
 692 {
 693         struct axp288_chrg_info *info =
 694             container_of(nb, struct axp288_chrg_info, otg.id_nb);
 695         struct extcon_dev *edev = param;
 696         int usb_host = extcon_get_cable_state(edev, "USB-Host");
 697
 698         dev_dbg(&info->pdev->dev, "external connector USB-Host is %s\n",
 699                                 usb_host ? "attached" : "detached");
 700
 701         /*
 702          * Set usb_id_short flag to avoid running charger detection logic
 703          * in case usb host.
 704          */
 705         info->otg.id_short = usb_host;
 706         schedule_work(&info->otg.work);
 707
 708         return NOTIFY_OK;
 709 }
 710
 711 static void charger_init_hw_regs(struct axp288_chrg_info *info)
 712 {
 713         int ret, cc, cv;
 714         unsigned int val;
 715
 716         /* Program temperature thresholds */
 717         ret = regmap_write(info->regmap, AXP20X_V_LTF_CHRG, CHRG_VLTFC_0C);
 718         if (ret < 0)
 719                 dev_warn(&info->pdev->dev, "register(%x) write error(%d)\n",
 720                                                         AXP20X_V_LTF_CHRG, ret);
 721
 722         ret = regmap_write(info->regmap, AXP20X_V_HTF_CHRG, CHRG_VHTFC_45C);
 723         if (ret < 0)
 724                 dev_warn(&info->pdev->dev, "register(%x) write error(%d)\n",
 725                                                         AXP20X_V_HTF_CHRG, ret);
 726
 727         /* Do not turn-off charger o/p after charge cycle ends */
 728         ret = regmap_update_bits(info->regmap,
 729                                 AXP20X_CHRG_CTRL2,
 730                                 CNTL2_CHG_OUT_TURNON, 1);
 731         if (ret < 0)
 732                 dev_warn(&info->pdev->dev, "register(%x) write error(%d)\n",
 733                                                 AXP20X_CHRG_CTRL2, ret);
 734
 735         /* Enable interrupts */
 736         ret = regmap_update_bits(info->regmap,
 737                                 AXP20X_IRQ2_EN,
 738                                 BAT_IRQ_CFG_BAT_MASK, 1);
 739         if (ret < 0)
 740                 dev_warn(&info->pdev->dev, "register(%x) write error(%d)\n",
 741                                                 AXP20X_IRQ2_EN, ret);
 742
 743         ret = regmap_update_bits(info->regmap, AXP20X_IRQ3_EN,
 744                                 TEMP_IRQ_CFG_MASK, 1);
 745         if (ret < 0)
 746                 dev_warn(&info->pdev->dev, "register(%x) write error(%d)\n",
 747                                                 AXP20X_IRQ3_EN, ret);
 748
 749         /* Setup ending condition for charging to be 10% of I(chrg) */
 750         ret = regmap_update_bits(info->regmap,
 751                                 AXP20X_CHRG_CTRL1,
 752                                 CHRG_CCCV_ITERM_20P, 0);
 753         if (ret < 0)
 754                 dev_warn(&info->pdev->dev, "register(%x) write error(%d)\n",
 755                                                 AXP20X_CHRG_CTRL1, ret);
 756
 757         /* Disable OCV-SOC curve calibration */
 758         ret = regmap_update_bits(info->regmap,
 759                                 AXP20X_CC_CTRL,
 760                                 FG_CNTL_OCV_ADJ_EN, 0);
 761         if (ret < 0)
 762                 dev_warn(&info->pdev->dev, "register(%x) write error(%d)\n",
 763                                                 AXP20X_CC_CTRL, ret);
 764
 765         /* Init charging current and voltage */
 766         info->max_cc = info->pdata->max_cc;
 767         info->max_cv = info->pdata->max_cv;
 768
 769         /* Read current charge voltage and current limit */
 770         ret = regmap_read(info->regmap, AXP20X_CHRG_CTRL1, &val);
 771         if (ret < 0) {
 772                 /* Assume default if cannot read */
 773                 info->cc = info->pdata->def_cc;
 774                 info->cv = info->pdata->def_cv;
 775         } else {
 776                 /* Determine charge voltage */
 777                 cv = (val & CHRG_CCCV_CV_MASK) >> CHRG_CCCV_CV_BIT_POS;
 778                 switch (cv) {
 779                 case CHRG_CCCV_CV_4100MV:
 780                         info->cv = CV_4100MV;
 781                         break;
 782                 case CHRG_CCCV_CV_4150MV:
 783                         info->cv = CV_4150MV;
 784                         break;
 785                 case CHRG_CCCV_CV_4200MV:
 786                         info->cv = CV_4200MV;
 787                         break;
 788                 case CHRG_CCCV_CV_4350MV:
 789                         info->cv = CV_4350MV;
 790                         break;
 791                 default:
 792                         info->cv = INT_MAX;
 793                         break;
 794                 }
 795
 796                 /* Determine charge current limit */
 797                 cc = (ret & CHRG_CCCV_CC_MASK) >> CHRG_CCCV_CC_BIT_POS;
 798                 cc = (cc * CHRG_CCCV_CC_LSB_RES) + CHRG_CCCV_CC_OFFSET;
 799                 info->cc = cc;
 800
 801                 /* Program default charging voltage and current */
 802                 cc = min(info->pdata->def_cc, info->max_cc);
 803                 cv = min(info->pdata->def_cv, info->max_cv);
 804
 805                 ret = axp288_charger_set_cc(info, cc);
 806                 if (ret < 0)
 807                         dev_warn(&info->pdev->dev,
 808                                         "error(%d) in setting CC\n", ret);
 809
 810                 ret = axp288_charger_set_cv(info, cv);
 811                 if (ret < 0)
 812                         dev_warn(&info->pdev->dev,
 813                                         "error(%d) in setting CV\n", ret);
 814         }
 815 }
 816
 817 static int axp288_charger_probe(struct platform_device *pdev)
 818 {
 819         int ret, i, pirq;
 820         struct axp288_chrg_info *info;
 821         struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
 822         struct power_supply_config charger_cfg = {};
 823
 824         info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
 825         if (!info)
 826                 return -ENOMEM;
 827
 828         info->pdev = pdev;
 829         info->regmap = axp20x->regmap;
 830         info->regmap_irqc = axp20x->regmap_irqc;
 831         info->pdata = pdev->dev.platform_data;
 832
 833         if (!info->pdata) {
 834                 /* Try ACPI provided pdata via device properties */
 835                 if (!device_property_present(&pdev->dev,
 836                                                 "axp288_charger_data\n"))
 837                         dev_err(&pdev->dev, "failed to get platform data\n");
 838                 return -ENODEV;
 839         }
 840
 841         info->cable.edev = extcon_get_extcon_dev(AXP288_EXTCON_DEV_NAME);
 842         if (info->cable.edev == NULL) {
 843                 dev_dbg(&pdev->dev, "%s is not ready, probe deferred\n",
 844                         AXP288_EXTCON_DEV_NAME);
 845                 return -EPROBE_DEFER;
 846         }
 847
 848         /* Register for extcon notification */
 849         INIT_WORK(&info->cable.work, axp288_charger_extcon_evt_worker);
 850         info->cable.nb.notifier_call = axp288_charger_handle_cable_evt;
 851         ret = extcon_register_notifier(info->cable.edev, EXTCON_NONE, &info->cable.nb);
 852         if (ret) {
 853                 dev_err(&info->pdev->dev,
 854                         "failed to register extcon notifier %d\n", ret);
 855                 return ret;
 856         }
 857
 858         platform_set_drvdata(pdev, info);
 859         mutex_init(&info->lock);
 860
 861         /* Register with power supply class */
 862         charger_cfg.drv_data = info;
 863         info->psy_usb = power_supply_register(&pdev->dev, &axp288_charger_desc,
 864                                                 &charger_cfg);
 865         if (IS_ERR(info->psy_usb)) {
 866                 dev_err(&pdev->dev, "failed to register power supply charger\n");
 867                 ret = PTR_ERR(info->psy_usb);
 868                 goto psy_reg_failed;
 869         }
 870
 871         /* Register for OTG notification */
 872         INIT_WORK(&info->otg.work, axp288_charger_otg_evt_worker);
 873         info->otg.id_nb.notifier_call = axp288_charger_handle_otg_evt;
 874         ret = extcon_register_interest(&info->otg.cable, NULL, "USB-Host",
 875                                        &info->otg.id_nb);
 876         if (ret)
 877                 dev_warn(&pdev->dev, "failed to register otg notifier\n");
 878
 879         if (info->otg.cable.edev)
 880                 info->otg.id_short = extcon_get_cable_state(
 881                                         info->otg.cable.edev, "USB-Host");
 882
 883         /* Register charger interrupts */
 884         for (i = 0; i < CHRG_INTR_END; i++) {
 885                 pirq = platform_get_irq(info->pdev, i);
 886                 info->irq[i] = regmap_irq_get_virq(info->regmap_irqc, pirq);
 887                 if (info->irq[i] < 0) {
 888                         dev_warn(&info->pdev->dev,
 889                                 "failed to get virtual interrupt=%d\n", pirq);
 890                         ret = info->irq[i];
 891                         goto intr_reg_failed;
 892                 }
 893                 ret = devm_request_threaded_irq(&info->pdev->dev, info->irq[i],
 894                                         NULL, axp288_charger_irq_thread_handler,
 895                                         IRQF_ONESHOT, info->pdev->name, info);
 896                 if (ret) {
 897                         dev_err(&pdev->dev, "failed to request interrupt=%d\n",
 898                                                                 info->irq[i]);
 899                         goto intr_reg_failed;
 900                 }
 901         }
 902
 903         charger_init_hw_regs(info);
 904
 905         return 0;
 906
 907 intr_reg_failed:
 908         if (info->otg.cable.edev)
 909                 extcon_unregister_interest(&info->otg.cable);
 910         power_supply_unregister(info->psy_usb);
 911 psy_reg_failed:
 912         extcon_unregister_notifier(info->cable.edev, EXTCON_NONE, &info->cable.nb);
 913         return ret;
 914 }
 915
 916 static int axp288_charger_remove(struct platform_device *pdev)
 917 {
 918         struct axp288_chrg_info *info =  dev_get_drvdata(&pdev->dev);
 919
 920         if (info->otg.cable.edev)
 921                 extcon_unregister_interest(&info->otg.cable);
 922
 923         extcon_unregister_notifier(info->cable.edev, EXTCON_NONE, &info->cable.nb);
 924         power_supply_unregister(info->psy_usb);
 925
 926         return 0;
 927 }
 928
 929 static struct platform_driver axp288_charger_driver = {
 930         .probe = axp288_charger_probe,
 931         .remove = axp288_charger_remove,
 932         .driver = {
 933                 .name = "axp288_charger",
 934         },
 935 };
 936
 937 module_platform_driver(axp288_charger_driver);
 938
 939 MODULE_AUTHOR("Ramakrishna Pallala <ramakrishna.pallala@intel.com>");
 940 MODULE_DESCRIPTION("X-power AXP288 Charger Driver");
 941 MODULE_LICENSE("GPL v2");