drivers/power/lp8788-charger.c

   1 /*
   2  * TI LP8788 MFD - battery charger driver
   3  *
   4  * Copyright 2012 Texas Instruments
   5  *
   6  * Author: Milo(Woogyom) Kim <milo.kim@ti.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  *
  12  */
  13
  14 #include <linux/err.h>
  15 #include <linux/iio/consumer.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/irqdomain.h>
  18 #include <linux/mfd/lp8788.h>
  19 #include <linux/module.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/power_supply.h>
  22 #include <linux/slab.h>
  23 #include <linux/workqueue.h>
  24
  25 /* register address */
  26 #define LP8788_CHG_STATUS               0x07
  27 #define LP8788_CHG_IDCIN                0x13
  28 #define LP8788_CHG_IBATT                0x14
  29 #define LP8788_CHG_VTERM                0x15
  30 #define LP8788_CHG_EOC                  0x16
  31
  32 /* mask/shift bits */
  33 #define LP8788_CHG_INPUT_STATE_M        0x03    /* Addr 07h */
  34 #define LP8788_CHG_STATE_M              0x3C
  35 #define LP8788_CHG_STATE_S              2
  36 #define LP8788_NO_BATT_M                BIT(6)
  37 #define LP8788_BAD_BATT_M               BIT(7)
  38 #define LP8788_CHG_IBATT_M              0x1F    /* Addr 14h */
  39 #define LP8788_CHG_VTERM_M              0x0F    /* Addr 15h */
  40 #define LP8788_CHG_EOC_LEVEL_M          0x30    /* Addr 16h */
  41 #define LP8788_CHG_EOC_LEVEL_S          4
  42 #define LP8788_CHG_EOC_TIME_M           0x0E
  43 #define LP8788_CHG_EOC_TIME_S           1
  44 #define LP8788_CHG_EOC_MODE_M           BIT(0)
  45
  46 #define LP8788_CHARGER_NAME             "charger"
  47 #define LP8788_BATTERY_NAME             "main_batt"
  48
  49 #define LP8788_CHG_START                0x11
  50 #define LP8788_CHG_END                  0x1C
  51
  52 #define LP8788_ISEL_MAX                 23
  53 #define LP8788_ISEL_STEP                50
  54 #define LP8788_VTERM_MIN                4100
  55 #define LP8788_VTERM_STEP               25
  56 #define LP8788_MAX_BATT_CAPACITY        100
  57 #define LP8788_MAX_CHG_IRQS             11
  58
  59 enum lp8788_charging_state {
  60         LP8788_OFF,
  61         LP8788_WARM_UP,
  62         LP8788_LOW_INPUT = 0x3,
  63         LP8788_PRECHARGE,
  64         LP8788_CC,
  65         LP8788_CV,
  66         LP8788_MAINTENANCE,
  67         LP8788_BATTERY_FAULT,
  68         LP8788_SYSTEM_SUPPORT = 0xC,
  69         LP8788_HIGH_CURRENT = 0xF,
  70         LP8788_MAX_CHG_STATE,
  71 };
  72
  73 enum lp8788_charger_adc_sel {
  74         LP8788_VBATT,
  75         LP8788_BATT_TEMP,
  76         LP8788_NUM_CHG_ADC,
  77 };
  78
  79 enum lp8788_charger_input_state {
  80         LP8788_SYSTEM_SUPPLY = 1,
  81         LP8788_FULL_FUNCTION,
  82 };
  83
  84 /*
  85  * struct lp8788_chg_irq
  86  * @which        : lp8788 interrupt id
  87  * @virq         : Linux IRQ number from irq_domain
  88  */
  89 struct lp8788_chg_irq {
  90         enum lp8788_int_id which;
  91         int virq;
  92 };
  93
  94 /*
  95  * struct lp8788_charger
  96  * @lp           : used for accessing the registers of mfd lp8788 device
  97  * @charger      : power supply driver for the battery charger
  98  * @battery      : power supply driver for the battery
  99  * @charger_work : work queue for charger input interrupts
 100  * @chan         : iio channels for getting adc values
 101  *                 eg) battery voltage, capacity and temperature
 102  * @irqs         : charger dedicated interrupts
 103  * @num_irqs     : total numbers of charger interrupts
 104  * @pdata        : charger platform specific data
 105  */
 106 struct lp8788_charger {
 107         struct lp8788 *lp;
 108         struct power_supply *charger;
 109         struct power_supply *battery;
 110         struct work_struct charger_work;
 111         struct iio_channel *chan[LP8788_NUM_CHG_ADC];
 112         struct lp8788_chg_irq irqs[LP8788_MAX_CHG_IRQS];
 113         int num_irqs;
 114         struct lp8788_charger_platform_data *pdata;
 115 };
 116
 117 static char *battery_supplied_to[] = {
 118         LP8788_BATTERY_NAME,
 119 };
 120
 121 static enum power_supply_property lp8788_charger_prop[] = {
 122         POWER_SUPPLY_PROP_ONLINE,
 123         POWER_SUPPLY_PROP_CURRENT_MAX,
 124 };
 125
 126 static enum power_supply_property lp8788_battery_prop[] = {
 127         POWER_SUPPLY_PROP_STATUS,
 128         POWER_SUPPLY_PROP_HEALTH,
 129         POWER_SUPPLY_PROP_PRESENT,
 130         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 131         POWER_SUPPLY_PROP_CAPACITY,
 132         POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
 133         POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
 134         POWER_SUPPLY_PROP_TEMP,
 135 };
 136
 137 static bool lp8788_is_charger_detected(struct lp8788_charger *pchg)
 138 {
 139         u8 data;
 140
 141         lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
 142         data &= LP8788_CHG_INPUT_STATE_M;
 143
 144         return data == LP8788_SYSTEM_SUPPLY || data == LP8788_FULL_FUNCTION;
 145 }
 146
 147 static int lp8788_charger_get_property(struct power_supply *psy,
 148                                         enum power_supply_property psp,
 149                                         union power_supply_propval *val)
 150 {
 151         struct lp8788_charger *pchg = dev_get_drvdata(psy->dev.parent);
 152         u8 read;
 153
 154         switch (psp) {
 155         case POWER_SUPPLY_PROP_ONLINE:
 156                 val->intval = lp8788_is_charger_detected(pchg);
 157                 break;
 158         case POWER_SUPPLY_PROP_CURRENT_MAX:
 159                 lp8788_read_byte(pchg->lp, LP8788_CHG_IDCIN, &read);
 160                 val->intval = LP8788_ISEL_STEP *
 161                                 (min_t(int, read, LP8788_ISEL_MAX) + 1);
 162                 break;
 163         default:
 164                 return -EINVAL;
 165         }
 166
 167         return 0;
 168 }
 169
 170 static int lp8788_get_battery_status(struct lp8788_charger *pchg,
 171                                 union power_supply_propval *val)
 172 {
 173         enum lp8788_charging_state state;
 174         u8 data;
 175         int ret;
 176
 177         ret = lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
 178         if (ret)
 179                 return ret;
 180
 181         state = (data & LP8788_CHG_STATE_M) >> LP8788_CHG_STATE_S;
 182         switch (state) {
 183         case LP8788_OFF:
 184                 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 185                 break;
 186         case LP8788_PRECHARGE:
 187         case LP8788_CC:
 188         case LP8788_CV:
 189         case LP8788_HIGH_CURRENT:
 190                 val->intval = POWER_SUPPLY_STATUS_CHARGING;
 191                 break;
 192         case LP8788_MAINTENANCE:
 193                 val->intval = POWER_SUPPLY_STATUS_FULL;
 194                 break;
 195         default:
 196                 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
 197                 break;
 198         }
 199
 200         return 0;
 201 }
 202
 203 static int lp8788_get_battery_health(struct lp8788_charger *pchg,
 204                                 union power_supply_propval *val)
 205 {
 206         u8 data;
 207         int ret;
 208
 209         ret = lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
 210         if (ret)
 211                 return ret;
 212
 213         if (data & LP8788_NO_BATT_M)
 214                 val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
 215         else if (data & LP8788_BAD_BATT_M)
 216                 val->intval = POWER_SUPPLY_HEALTH_DEAD;
 217         else
 218                 val->intval = POWER_SUPPLY_HEALTH_GOOD;
 219
 220         return 0;
 221 }
 222
 223 static int lp8788_get_battery_present(struct lp8788_charger *pchg,
 224                                 union power_supply_propval *val)
 225 {
 226         u8 data;
 227         int ret;
 228
 229         ret = lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
 230         if (ret)
 231                 return ret;
 232
 233         val->intval = !(data & LP8788_NO_BATT_M);
 234         return 0;
 235 }
 236
 237 static int lp8788_get_vbatt_adc(struct lp8788_charger *pchg, int *result)
 238 {
 239         struct iio_channel *channel = pchg->chan[LP8788_VBATT];
 240
 241         if (!channel)
 242                 return -EINVAL;
 243
 244         return iio_read_channel_processed(channel, result);
 245 }
 246
 247 static int lp8788_get_battery_voltage(struct lp8788_charger *pchg,
 248                                 union power_supply_propval *val)
 249 {
 250         return lp8788_get_vbatt_adc(pchg, &val->intval);
 251 }
 252
 253 static int lp8788_get_battery_capacity(struct lp8788_charger *pchg,
 254                                 union power_supply_propval *val)
 255 {
 256         struct lp8788 *lp = pchg->lp;
 257         struct lp8788_charger_platform_data *pdata = pchg->pdata;
 258         unsigned int max_vbatt;
 259         int vbatt;
 260         enum lp8788_charging_state state;
 261         u8 data;
 262         int ret;
 263
 264         if (!pdata)
 265                 return -EINVAL;
 266
 267         max_vbatt = pdata->max_vbatt_mv;
 268         if (max_vbatt == 0)
 269                 return -EINVAL;
 270
 271         ret = lp8788_read_byte(lp, LP8788_CHG_STATUS, &data);
 272         if (ret)
 273                 return ret;
 274
 275         state = (data & LP8788_CHG_STATE_M) >> LP8788_CHG_STATE_S;
 276
 277         if (state == LP8788_MAINTENANCE) {
 278                 val->intval = LP8788_MAX_BATT_CAPACITY;
 279         } else {
 280                 ret = lp8788_get_vbatt_adc(pchg, &vbatt);
 281                 if (ret)
 282                         return ret;
 283
 284                 val->intval = (vbatt * LP8788_MAX_BATT_CAPACITY) / max_vbatt;
 285                 val->intval = min(val->intval, LP8788_MAX_BATT_CAPACITY);
 286         }
 287
 288         return 0;
 289 }
 290
 291 static int lp8788_get_battery_temperature(struct lp8788_charger *pchg,
 292                                 union power_supply_propval *val)
 293 {
 294         struct iio_channel *channel = pchg->chan[LP8788_BATT_TEMP];
 295         int result;
 296         int ret;
 297
 298         if (!channel)
 299                 return -EINVAL;
 300
 301         ret = iio_read_channel_processed(channel, &result);
 302         if (ret < 0)
 303                 return -EINVAL;
 304
 305         /* unit: 0.1 'C */
 306         val->intval = result * 10;
 307
 308         return 0;
 309 }
 310
 311 static int lp8788_get_battery_charging_current(struct lp8788_charger *pchg,
 312                                 union power_supply_propval *val)
 313 {
 314         u8 read;
 315
 316         lp8788_read_byte(pchg->lp, LP8788_CHG_IBATT, &read);
 317         read &= LP8788_CHG_IBATT_M;
 318         val->intval = LP8788_ISEL_STEP *
 319                         (min_t(int, read, LP8788_ISEL_MAX) + 1);
 320
 321         return 0;
 322 }
 323
 324 static int lp8788_get_charging_termination_voltage(struct lp8788_charger *pchg,
 325                                 union power_supply_propval *val)
 326 {
 327         u8 read;
 328
 329         lp8788_read_byte(pchg->lp, LP8788_CHG_VTERM, &read);
 330         read &= LP8788_CHG_VTERM_M;
 331         val->intval = LP8788_VTERM_MIN + LP8788_VTERM_STEP * read;
 332
 333         return 0;
 334 }
 335
 336 static int lp8788_battery_get_property(struct power_supply *psy,
 337                                         enum power_supply_property psp,
 338                                         union power_supply_propval *val)
 339 {
 340         struct lp8788_charger *pchg = dev_get_drvdata(psy->dev.parent);
 341
 342         switch (psp) {
 343         case POWER_SUPPLY_PROP_STATUS:
 344                 return lp8788_get_battery_status(pchg, val);
 345         case POWER_SUPPLY_PROP_HEALTH:
 346                 return lp8788_get_battery_health(pchg, val);
 347         case POWER_SUPPLY_PROP_PRESENT:
 348                 return lp8788_get_battery_present(pchg, val);
 349         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 350                 return lp8788_get_battery_voltage(pchg, val);
 351         case POWER_SUPPLY_PROP_CAPACITY:
 352                 return lp8788_get_battery_capacity(pchg, val);
 353         case POWER_SUPPLY_PROP_TEMP:
 354                 return lp8788_get_battery_temperature(pchg, val);
 355         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
 356                 return lp8788_get_battery_charging_current(pchg, val);
 357         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
 358                 return lp8788_get_charging_termination_voltage(pchg, val);
 359         default:
 360                 return -EINVAL;
 361         }
 362 }
 363
 364 static inline bool lp8788_is_valid_charger_register(u8 addr)
 365 {
 366         return addr >= LP8788_CHG_START && addr <= LP8788_CHG_END;
 367 }
 368
 369 static int lp8788_update_charger_params(struct platform_device *pdev,
 370                                         struct lp8788_charger *pchg)
 371 {
 372         struct lp8788 *lp = pchg->lp;
 373         struct lp8788_charger_platform_data *pdata = pchg->pdata;
 374         struct lp8788_chg_param *param;
 375         int i;
 376         int ret;
 377
 378         if (!pdata || !pdata->chg_params) {
 379                 dev_info(&pdev->dev, "skip updating charger parameters\n");
 380                 return 0;
 381         }
 382
 383         /* settting charging parameters */
 384         for (i = 0; i < pdata->num_chg_params; i++) {
 385                 param = pdata->chg_params + i;
 386
 387                 if (!param)
 388                         continue;
 389
 390                 if (lp8788_is_valid_charger_register(param->addr)) {
 391                         ret = lp8788_write_byte(lp, param->addr, param->val);
 392                         if (ret)
 393                                 return ret;
 394                 }
 395         }
 396
 397         return 0;
 398 }
 399
 400 static const struct power_supply_desc lp8788_psy_charger_desc = {
 401         .name           = LP8788_CHARGER_NAME,
 402         .type           = POWER_SUPPLY_TYPE_MAINS,
 403         .properties     = lp8788_charger_prop,
 404         .num_properties = ARRAY_SIZE(lp8788_charger_prop),
 405         .get_property   = lp8788_charger_get_property,
 406 };
 407
 408 static const struct power_supply_desc lp8788_psy_battery_desc = {
 409         .name           = LP8788_BATTERY_NAME,
 410         .type           = POWER_SUPPLY_TYPE_BATTERY,
 411         .properties     = lp8788_battery_prop,
 412         .num_properties = ARRAY_SIZE(lp8788_battery_prop),
 413         .get_property   = lp8788_battery_get_property,
 414 };
 415
 416 static int lp8788_psy_register(struct platform_device *pdev,
 417                                 struct lp8788_charger *pchg)
 418 {
 419         struct power_supply_config charger_cfg = {};
 420
 421         charger_cfg.supplied_to = battery_supplied_to;
 422         charger_cfg.num_supplicants = ARRAY_SIZE(battery_supplied_to);
 423
 424         pchg->charger = power_supply_register(&pdev->dev,
 425                                               &lp8788_psy_charger_desc,
 426                                               &charger_cfg);
 427         if (IS_ERR(pchg->charger))
 428                 return -EPERM;
 429
 430         pchg->battery = power_supply_register(&pdev->dev,
 431                                               &lp8788_psy_battery_desc, NULL);
 432         if (IS_ERR(pchg->battery)) {
 433                 power_supply_unregister(pchg->charger);
 434                 return -EPERM;
 435         }
 436
 437         return 0;
 438 }
 439
 440 static void lp8788_psy_unregister(struct lp8788_charger *pchg)
 441 {
 442         power_supply_unregister(pchg->battery);
 443         power_supply_unregister(pchg->charger);
 444 }
 445
 446 static void lp8788_charger_event(struct work_struct *work)
 447 {
 448         struct lp8788_charger *pchg =
 449                 container_of(work, struct lp8788_charger, charger_work);
 450         struct lp8788_charger_platform_data *pdata = pchg->pdata;
 451         enum lp8788_charger_event event = lp8788_is_charger_detected(pchg);
 452
 453         pdata->charger_event(pchg->lp, event);
 454 }
 455
 456 static bool lp8788_find_irq_id(struct lp8788_charger *pchg, int virq, int *id)
 457 {
 458         bool found;
 459         int i;
 460
 461         for (i = 0; i < pchg->num_irqs; i++) {
 462                 if (pchg->irqs[i].virq == virq) {
 463                         *id = pchg->irqs[i].which;
 464                         found = true;
 465                         break;
 466                 }
 467         }
 468
 469         return found;
 470 }
 471
 472 static irqreturn_t lp8788_charger_irq_thread(int virq, void *ptr)
 473 {
 474         struct lp8788_charger *pchg = ptr;
 475         struct lp8788_charger_platform_data *pdata = pchg->pdata;
 476         int id = -1;
 477
 478         if (!lp8788_find_irq_id(pchg, virq, &id))
 479                 return IRQ_NONE;
 480
 481         switch (id) {
 482         case LP8788_INT_CHG_INPUT_STATE:
 483         case LP8788_INT_CHG_STATE:
 484         case LP8788_INT_EOC:
 485         case LP8788_INT_BATT_LOW:
 486         case LP8788_INT_NO_BATT:
 487                 power_supply_changed(pchg->charger);
 488                 power_supply_changed(pchg->battery);
 489                 break;
 490         default:
 491                 break;
 492         }
 493
 494         /* report charger dectection event if used */
 495         if (!pdata)
 496                 goto irq_handled;
 497
 498         if (pdata->charger_event && id == LP8788_INT_CHG_INPUT_STATE)
 499                 schedule_work(&pchg->charger_work);
 500
 501 irq_handled:
 502         return IRQ_HANDLED;
 503 }
 504
 505 static int lp8788_set_irqs(struct platform_device *pdev,
 506                         struct lp8788_charger *pchg, const char *name)
 507 {
 508         struct resource *r;
 509         struct irq_domain *irqdm = pchg->lp->irqdm;
 510         int irq_start;
 511         int irq_end;
 512         int virq;
 513         int nr_irq;
 514         int i;
 515         int ret;
 516
 517         /* no error even if no irq resource */
 518         r = platform_get_resource_byname(pdev, IORESOURCE_IRQ, name);
 519         if (!r)
 520                 return 0;
 521
 522         irq_start = r->start;
 523         irq_end = r->end;
 524
 525         for (i = irq_start; i <= irq_end; i++) {
 526                 nr_irq = pchg->num_irqs;
 527
 528                 virq = irq_create_mapping(irqdm, i);
 529                 pchg->irqs[nr_irq].virq = virq;
 530                 pchg->irqs[nr_irq].which = i;
 531                 pchg->num_irqs++;
 532
 533                 ret = request_threaded_irq(virq, NULL,
 534                                         lp8788_charger_irq_thread,
 535                                         0, name, pchg);
 536                 if (ret)
 537                         break;
 538         }
 539
 540         if (i <= irq_end)
 541                 goto err_free_irq;
 542
 543         return 0;
 544
 545 err_free_irq:
 546         for (i = 0; i < pchg->num_irqs; i++)
 547                 free_irq(pchg->irqs[i].virq, pchg);
 548         return ret;
 549 }
 550
 551 static int lp8788_irq_register(struct platform_device *pdev,
 552                                 struct lp8788_charger *pchg)
 553 {
 554         const char *name[] = {
 555                 LP8788_CHG_IRQ, LP8788_PRSW_IRQ, LP8788_BATT_IRQ
 556         };
 557         int i;
 558         int ret;
 559
 560         INIT_WORK(&pchg->charger_work, lp8788_charger_event);
 561         pchg->num_irqs = 0;
 562
 563         for (i = 0; i < ARRAY_SIZE(name); i++) {
 564                 ret = lp8788_set_irqs(pdev, pchg, name[i]);
 565                 if (ret) {
 566                         dev_warn(&pdev->dev, "irq setup failed: %s\n", name[i]);
 567                         return ret;
 568                 }
 569         }
 570
 571         if (pchg->num_irqs > LP8788_MAX_CHG_IRQS) {
 572                 dev_err(&pdev->dev, "invalid total number of irqs: %d\n",
 573                         pchg->num_irqs);
 574                 return -EINVAL;
 575         }
 576
 577
 578         return 0;
 579 }
 580
 581 static void lp8788_irq_unregister(struct platform_device *pdev,
 582                                   struct lp8788_charger *pchg)
 583 {
 584         int i;
 585         int irq;
 586
 587         for (i = 0; i < pchg->num_irqs; i++) {
 588                 irq = pchg->irqs[i].virq;
 589                 if (!irq)
 590                         continue;
 591
 592                 free_irq(irq, pchg);
 593         }
 594 }
 595
 596 static void lp8788_setup_adc_channel(struct device *dev,
 597                                 struct lp8788_charger *pchg)
 598 {
 599         struct lp8788_charger_platform_data *pdata = pchg->pdata;
 600         struct iio_channel *chan;
 601
 602         if (!pdata)
 603                 return;
 604
 605         /* ADC channel for battery voltage */
 606         chan = iio_channel_get(dev, pdata->adc_vbatt);
 607         pchg->chan[LP8788_VBATT] = IS_ERR(chan) ? NULL : chan;
 608
 609         /* ADC channel for battery temperature */
 610         chan = iio_channel_get(dev, pdata->adc_batt_temp);
 611         pchg->chan[LP8788_BATT_TEMP] = IS_ERR(chan) ? NULL : chan;
 612 }
 613
 614 static void lp8788_release_adc_channel(struct lp8788_charger *pchg)
 615 {
 616         int i;
 617
 618         for (i = 0; i < LP8788_NUM_CHG_ADC; i++) {
 619                 if (!pchg->chan[i])
 620                         continue;
 621
 622                 iio_channel_release(pchg->chan[i]);
 623                 pchg->chan[i] = NULL;
 624         }
 625 }
 626
 627 static ssize_t lp8788_show_charger_status(struct device *dev,
 628                                 struct device_attribute *attr, char *buf)
 629 {
 630         struct lp8788_charger *pchg = dev_get_drvdata(dev);
 631         enum lp8788_charging_state state;
 632         char *desc[LP8788_MAX_CHG_STATE] = {
 633                 [LP8788_OFF] = "CHARGER OFF",
 634                 [LP8788_WARM_UP] = "WARM UP",
 635                 [LP8788_LOW_INPUT] = "LOW INPUT STATE",
 636                 [LP8788_PRECHARGE] = "CHARGING - PRECHARGE",
 637                 [LP8788_CC] = "CHARGING - CC",
 638                 [LP8788_CV] = "CHARGING - CV",
 639                 [LP8788_MAINTENANCE] = "NO CHARGING - MAINTENANCE",
 640                 [LP8788_BATTERY_FAULT] = "BATTERY FAULT",
 641                 [LP8788_SYSTEM_SUPPORT] = "SYSTEM SUPPORT",
 642                 [LP8788_HIGH_CURRENT] = "HIGH CURRENT",
 643         };
 644         u8 data;
 645
 646         lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
 647         state = (data & LP8788_CHG_STATE_M) >> LP8788_CHG_STATE_S;
 648
 649         return scnprintf(buf, PAGE_SIZE, "%s\n", desc[state]);
 650 }
 651
 652 static ssize_t lp8788_show_eoc_time(struct device *dev,
 653                                 struct device_attribute *attr, char *buf)
 654 {
 655         struct lp8788_charger *pchg = dev_get_drvdata(dev);
 656         char *stime[] = { "400ms", "5min", "10min", "15min",
 657                         "20min", "25min", "30min" "No timeout" };
 658         u8 val;
 659
 660         lp8788_read_byte(pchg->lp, LP8788_CHG_EOC, &val);
 661         val = (val & LP8788_CHG_EOC_TIME_M) >> LP8788_CHG_EOC_TIME_S;
 662
 663         return scnprintf(buf, PAGE_SIZE, "End Of Charge Time: %s\n",
 664                         stime[val]);
 665 }
 666
 667 static ssize_t lp8788_show_eoc_level(struct device *dev,
 668                                 struct device_attribute *attr, char *buf)
 669 {
 670         struct lp8788_charger *pchg = dev_get_drvdata(dev);
 671         char *abs_level[] = { "25mA", "49mA", "75mA", "98mA" };
 672         char *relative_level[] = { "5%", "10%", "15%", "20%" };
 673         char *level;
 674         u8 val;
 675         u8 mode;
 676
 677         lp8788_read_byte(pchg->lp, LP8788_CHG_EOC, &val);
 678
 679         mode = val & LP8788_CHG_EOC_MODE_M;
 680         val = (val & LP8788_CHG_EOC_LEVEL_M) >> LP8788_CHG_EOC_LEVEL_S;
 681         level = mode ? abs_level[val] : relative_level[val];
 682
 683         return scnprintf(buf, PAGE_SIZE, "End Of Charge Level: %s\n", level);
 684 }
 685
 686 static DEVICE_ATTR(charger_status, S_IRUSR, lp8788_show_charger_status, NULL);
 687 static DEVICE_ATTR(eoc_time, S_IRUSR, lp8788_show_eoc_time, NULL);
 688 static DEVICE_ATTR(eoc_level, S_IRUSR, lp8788_show_eoc_level, NULL);
 689
 690 static struct attribute *lp8788_charger_attr[] = {
 691         &dev_attr_charger_status.attr,
 692         &dev_attr_eoc_time.attr,
 693         &dev_attr_eoc_level.attr,
 694         NULL,
 695 };
 696
 697 static const struct attribute_group lp8788_attr_group = {
 698         .attrs = lp8788_charger_attr,
 699 };
 700
 701 static int lp8788_charger_probe(struct platform_device *pdev)
 702 {
 703         struct lp8788 *lp = dev_get_drvdata(pdev->dev.parent);
 704         struct lp8788_charger *pchg;
 705         struct device *dev = &pdev->dev;
 706         int ret;
 707
 708         pchg = devm_kzalloc(dev, sizeof(struct lp8788_charger), GFP_KERNEL);
 709         if (!pchg)
 710                 return -ENOMEM;
 711
 712         pchg->lp = lp;
 713         pchg->pdata = lp->pdata ? lp->pdata->chg_pdata : NULL;
 714         platform_set_drvdata(pdev, pchg);
 715
 716         ret = lp8788_update_charger_params(pdev, pchg);
 717         if (ret)
 718                 return ret;
 719
 720         lp8788_setup_adc_channel(&pdev->dev, pchg);
 721
 722         ret = lp8788_psy_register(pdev, pchg);
 723         if (ret)
 724                 return ret;
 725
 726         ret = sysfs_create_group(&pdev->dev.kobj, &lp8788_attr_group);
 727         if (ret) {
 728                 lp8788_psy_unregister(pchg);
 729                 return ret;
 730         }
 731
 732         ret = lp8788_irq_register(pdev, pchg);
 733         if (ret)
 734                 dev_warn(dev, "failed to register charger irq: %d\n", ret);
 735
 736         return 0;
 737 }
 738
 739 static int lp8788_charger_remove(struct platform_device *pdev)
 740 {
 741         struct lp8788_charger *pchg = platform_get_drvdata(pdev);
 742
 743         flush_work(&pchg->charger_work);
 744         lp8788_irq_unregister(pdev, pchg);
 745         sysfs_remove_group(&pdev->dev.kobj, &lp8788_attr_group);
 746         lp8788_psy_unregister(pchg);
 747         lp8788_release_adc_channel(pchg);
 748
 749         return 0;
 750 }
 751
 752 static struct platform_driver lp8788_charger_driver = {
 753         .probe = lp8788_charger_probe,
 754         .remove = lp8788_charger_remove,
 755         .driver = {
 756                 .name = LP8788_DEV_CHARGER,
 757         },
 758 };
 759 module_platform_driver(lp8788_charger_driver);
 760
 761 MODULE_DESCRIPTION("TI LP8788 Charger Driver");
 762 MODULE_AUTHOR("Milo Kim");
 763 MODULE_LICENSE("GPL");
 764 MODULE_ALIAS("platform:lp8788-charger");