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_BUF_SIZE                 40
  53 #define LP8788_ISEL_MAX                 23
  54 #define LP8788_ISEL_STEP                50
  55 #define LP8788_VTERM_MIN                4100
  56 #define LP8788_VTERM_STEP               25
  57 #define LP8788_MAX_BATT_CAPACITY        100
  58 #define LP8788_MAX_CHG_IRQS             11
  59
  60 enum lp8788_charging_state {
  61         LP8788_OFF,
  62         LP8788_WARM_UP,
  63         LP8788_LOW_INPUT = 0x3,
  64         LP8788_PRECHARGE,
  65         LP8788_CC,
  66         LP8788_CV,
  67         LP8788_MAINTENANCE,
  68         LP8788_BATTERY_FAULT,
  69         LP8788_SYSTEM_SUPPORT = 0xC,
  70         LP8788_HIGH_CURRENT = 0xF,
  71         LP8788_MAX_CHG_STATE,
  72 };
  73
  74 enum lp8788_charger_adc_sel {
  75         LP8788_VBATT,
  76         LP8788_BATT_TEMP,
  77         LP8788_NUM_CHG_ADC,
  78 };
  79
  80 enum lp8788_charger_input_state {
  81         LP8788_SYSTEM_SUPPLY = 1,
  82         LP8788_FULL_FUNCTION,
  83 };
  84
  85 /*
  86  * struct lp8788_chg_irq
  87  * @which        : lp8788 interrupt id
  88  * @virq         : Linux IRQ number from irq_domain
  89  */
  90 struct lp8788_chg_irq {
  91         enum lp8788_int_id which;
  92         int virq;
  93 };
  94
  95 /*
  96  * struct lp8788_charger
  97  * @lp           : used for accessing the registers of mfd lp8788 device
  98  * @charger      : power supply driver for the battery charger
  99  * @battery      : power supply driver for the battery
 100  * @charger_work : work queue for charger input interrupts
 101  * @chan         : iio channels for getting adc values
 102  *                 eg) battery voltage, capacity and temperature
 103  * @irqs         : charger dedicated interrupts
 104  * @num_irqs     : total numbers of charger interrupts
 105  * @pdata        : charger platform specific data
 106  */
 107 struct lp8788_charger {
 108         struct lp8788 *lp;
 109         struct power_supply charger;
 110         struct power_supply battery;
 111         struct work_struct charger_work;
 112         struct iio_channel *chan[LP8788_NUM_CHG_ADC];
 113         struct lp8788_chg_irq irqs[LP8788_MAX_CHG_IRQS];
 114         int num_irqs;
 115         struct lp8788_charger_platform_data *pdata;
 116 };
 117
 118 static char *battery_supplied_to[] = {
 119         LP8788_BATTERY_NAME,
 120 };
 121
 122 static enum power_supply_property lp8788_charger_prop[] = {
 123         POWER_SUPPLY_PROP_ONLINE,
 124         POWER_SUPPLY_PROP_CURRENT_MAX,
 125 };
 126
 127 static enum power_supply_property lp8788_battery_prop[] = {
 128         POWER_SUPPLY_PROP_STATUS,
 129         POWER_SUPPLY_PROP_HEALTH,
 130         POWER_SUPPLY_PROP_PRESENT,
 131         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 132         POWER_SUPPLY_PROP_CAPACITY,
 133         POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
 134         POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
 135         POWER_SUPPLY_PROP_TEMP,
 136 };
 137
 138 static bool lp8788_is_charger_detected(struct lp8788_charger *pchg)
 139 {
 140         u8 data;
 141
 142         lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
 143         data &= LP8788_CHG_INPUT_STATE_M;
 144
 145         return data == LP8788_SYSTEM_SUPPLY || data == LP8788_FULL_FUNCTION;
 146 }
 147
 148 static int lp8788_charger_get_property(struct power_supply *psy,
 149                                         enum power_supply_property psp,
 150                                         union power_supply_propval *val)
 151 {
 152         struct lp8788_charger *pchg = dev_get_drvdata(psy->dev->parent);
 153         u8 read;
 154
 155         switch (psp) {
 156         case POWER_SUPPLY_PROP_ONLINE:
 157                 val->intval = lp8788_is_charger_detected(pchg);
 158                 break;
 159         case POWER_SUPPLY_PROP_CURRENT_MAX:
 160                 lp8788_read_byte(pchg->lp, LP8788_CHG_IDCIN, &read);
 161                 val->intval = LP8788_ISEL_STEP *
 162                                 (min_t(int, read, LP8788_ISEL_MAX) + 1);
 163                 break;
 164         default:
 165                 return -EINVAL;
 166         }
 167
 168         return 0;
 169 }
 170
 171 static int lp8788_get_battery_status(struct lp8788_charger *pchg,
 172                                 union power_supply_propval *val)
 173 {
 174         enum lp8788_charging_state state;
 175         u8 data;
 176         int ret;
 177
 178         ret = lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
 179         if (ret)
 180                 return ret;
 181
 182         state = (data & LP8788_CHG_STATE_M) >> LP8788_CHG_STATE_S;
 183         switch (state) {
 184         case LP8788_OFF:
 185                 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 186                 break;
 187         case LP8788_PRECHARGE:
 188         case LP8788_CC:
 189         case LP8788_CV:
 190         case LP8788_HIGH_CURRENT:
 191                 val->intval = POWER_SUPPLY_STATUS_CHARGING;
 192                 break;
 193         case LP8788_MAINTENANCE:
 194                 val->intval = POWER_SUPPLY_STATUS_FULL;
 195                 break;
 196         default:
 197                 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
 198                 break;
 199         }
 200
 201         return 0;
 202 }
 203
 204 static int lp8788_get_battery_health(struct lp8788_charger *pchg,
 205                                 union power_supply_propval *val)
 206 {
 207         u8 data;
 208         int ret;
 209
 210         ret = lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
 211         if (ret)
 212                 return ret;
 213
 214         if (data & LP8788_NO_BATT_M)
 215                 val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
 216         else if (data & LP8788_BAD_BATT_M)
 217                 val->intval = POWER_SUPPLY_HEALTH_DEAD;
 218         else
 219                 val->intval = POWER_SUPPLY_HEALTH_GOOD;
 220
 221         return 0;
 222 }
 223
 224 static int lp8788_get_battery_present(struct lp8788_charger *pchg,
 225                                 union power_supply_propval *val)
 226 {
 227         u8 data;
 228         int ret;
 229
 230         ret = lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
 231         if (ret)
 232                 return ret;
 233
 234         val->intval = !(data & LP8788_NO_BATT_M);
 235         return 0;
 236 }
 237
 238 static int lp8788_get_vbatt_adc(struct lp8788_charger *pchg,
 239                                 unsigned int *result)
 240 {
 241         struct iio_channel *channel = pchg->chan[LP8788_VBATT];
 242         int scaleint;
 243         int scalepart;
 244         int ret;
 245
 246         if (!channel)
 247                 return -EINVAL;
 248
 249         ret = iio_read_channel_scale(channel, &scaleint, &scalepart);
 250         if (ret != IIO_VAL_INT_PLUS_MICRO)
 251                 return -EINVAL;
 252
 253         /* unit: mV */
 254         *result = (scaleint + scalepart * 1000000) / 1000;
 255
 256         return 0;
 257 }
 258
 259 static int lp8788_get_battery_voltage(struct lp8788_charger *pchg,
 260                                 union power_supply_propval *val)
 261 {
 262         return lp8788_get_vbatt_adc(pchg, &val->intval);
 263 }
 264
 265 static int lp8788_get_battery_capacity(struct lp8788_charger *pchg,
 266                                 union power_supply_propval *val)
 267 {
 268         struct lp8788 *lp = pchg->lp;
 269         struct lp8788_charger_platform_data *pdata = pchg->pdata;
 270         unsigned int max_vbatt;
 271         unsigned int vbatt;
 272         enum lp8788_charging_state state;
 273         u8 data;
 274         int ret;
 275
 276         if (!pdata)
 277                 return -EINVAL;
 278
 279         max_vbatt = pdata->max_vbatt_mv;
 280         if (max_vbatt == 0)
 281                 return -EINVAL;
 282
 283         ret = lp8788_read_byte(lp, LP8788_CHG_STATUS, &data);
 284         if (ret)
 285                 return ret;
 286
 287         state = (data & LP8788_CHG_STATE_M) >> LP8788_CHG_STATE_S;
 288
 289         if (state == LP8788_MAINTENANCE) {
 290                 val->intval = LP8788_MAX_BATT_CAPACITY;
 291         } else {
 292                 ret = lp8788_get_vbatt_adc(pchg, &vbatt);
 293                 if (ret)
 294                         return ret;
 295
 296                 val->intval = (vbatt * LP8788_MAX_BATT_CAPACITY) / max_vbatt;
 297                 val->intval = min(val->intval, LP8788_MAX_BATT_CAPACITY);
 298         }
 299
 300         return 0;
 301 }
 302
 303 static int lp8788_get_battery_temperature(struct lp8788_charger *pchg,
 304                                 union power_supply_propval *val)
 305 {
 306         struct iio_channel *channel = pchg->chan[LP8788_BATT_TEMP];
 307         int scaleint;
 308         int scalepart;
 309         int ret;
 310
 311         if (!channel)
 312                 return -EINVAL;
 313
 314         ret = iio_read_channel_scale(channel, &scaleint, &scalepart);
 315         if (ret != IIO_VAL_INT_PLUS_MICRO)
 316                 return -EINVAL;
 317
 318         /* unit: 0.1 'C */
 319         val->intval = (scaleint + scalepart * 1000000) / 100;
 320
 321         return 0;
 322 }
 323
 324 static int lp8788_get_battery_charging_current(struct lp8788_charger *pchg,
 325                                 union power_supply_propval *val)
 326 {
 327         u8 read;
 328
 329         lp8788_read_byte(pchg->lp, LP8788_CHG_IBATT, &read);
 330         read &= LP8788_CHG_IBATT_M;
 331         val->intval = LP8788_ISEL_STEP *
 332                         (min_t(int, read, LP8788_ISEL_MAX) + 1);
 333
 334         return 0;
 335 }
 336
 337 static int lp8788_get_charging_termination_voltage(struct lp8788_charger *pchg,
 338                                 union power_supply_propval *val)
 339 {
 340         u8 read;
 341
 342         lp8788_read_byte(pchg->lp, LP8788_CHG_VTERM, &read);
 343         read &= LP8788_CHG_VTERM_M;
 344         val->intval = LP8788_VTERM_MIN + LP8788_VTERM_STEP * read;
 345
 346         return 0;
 347 }
 348
 349 static int lp8788_battery_get_property(struct power_supply *psy,
 350                                         enum power_supply_property psp,
 351                                         union power_supply_propval *val)
 352 {
 353         struct lp8788_charger *pchg = dev_get_drvdata(psy->dev->parent);
 354
 355         switch (psp) {
 356         case POWER_SUPPLY_PROP_STATUS:
 357                 return lp8788_get_battery_status(pchg, val);
 358         case POWER_SUPPLY_PROP_HEALTH:
 359                 return lp8788_get_battery_health(pchg, val);
 360         case POWER_SUPPLY_PROP_PRESENT:
 361                 return lp8788_get_battery_present(pchg, val);
 362         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 363                 return lp8788_get_battery_voltage(pchg, val);
 364         case POWER_SUPPLY_PROP_CAPACITY:
 365                 return lp8788_get_battery_capacity(pchg, val);
 366         case POWER_SUPPLY_PROP_TEMP:
 367                 return lp8788_get_battery_temperature(pchg, val);
 368         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
 369                 return lp8788_get_battery_charging_current(pchg, val);
 370         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
 371                 return lp8788_get_charging_termination_voltage(pchg, val);
 372         default:
 373                 return -EINVAL;
 374         }
 375 }
 376
 377 static inline bool lp8788_is_valid_charger_register(u8 addr)
 378 {
 379         return addr >= LP8788_CHG_START && addr <= LP8788_CHG_END;
 380 }
 381
 382 static int lp8788_update_charger_params(struct lp8788_charger *pchg)
 383 {
 384         struct lp8788 *lp = pchg->lp;
 385         struct lp8788_charger_platform_data *pdata = pchg->pdata;
 386         struct lp8788_chg_param *param;
 387         int i;
 388         int ret;
 389
 390         if (!pdata || !pdata->chg_params) {
 391                 dev_info(lp->dev, "skip updating charger parameters\n");
 392                 return 0;
 393         }
 394
 395         /* settting charging parameters */
 396         for (i = 0; i < pdata->num_chg_params; i++) {
 397                 param = pdata->chg_params + i;
 398
 399                 if (!param)
 400                         continue;
 401
 402                 if (lp8788_is_valid_charger_register(param->addr)) {
 403                         ret = lp8788_write_byte(lp, param->addr, param->val);
 404                         if (ret)
 405                                 return ret;
 406                 }
 407         }
 408
 409         return 0;
 410 }
 411
 412 static int lp8788_psy_register(struct platform_device *pdev,
 413                                 struct lp8788_charger *pchg)
 414 {
 415         pchg->charger.name = LP8788_CHARGER_NAME;
 416         pchg->charger.type = POWER_SUPPLY_TYPE_MAINS;
 417         pchg->charger.properties = lp8788_charger_prop;
 418         pchg->charger.num_properties = ARRAY_SIZE(lp8788_charger_prop);
 419         pchg->charger.get_property = lp8788_charger_get_property;
 420         pchg->charger.supplied_to = battery_supplied_to;
 421         pchg->charger.num_supplicants = ARRAY_SIZE(battery_supplied_to);
 422
 423         if (power_supply_register(&pdev->dev, &pchg->charger))
 424                 return -EPERM;
 425
 426         pchg->battery.name = LP8788_BATTERY_NAME;
 427         pchg->battery.type = POWER_SUPPLY_TYPE_BATTERY;
 428         pchg->battery.properties = lp8788_battery_prop;
 429         pchg->battery.num_properties = ARRAY_SIZE(lp8788_battery_prop);
 430         pchg->battery.get_property = lp8788_battery_get_property;
 431
 432         if (power_supply_register(&pdev->dev, &pchg->battery))
 433                 return -EPERM;
 434
 435         return 0;
 436 }
 437
 438 static void lp8788_psy_unregister(struct lp8788_charger *pchg)
 439 {
 440         power_supply_unregister(&pchg->battery);
 441         power_supply_unregister(&pchg->charger);
 442 }
 443
 444 static void lp8788_charger_event(struct work_struct *work)
 445 {
 446         struct lp8788_charger *pchg =
 447                 container_of(work, struct lp8788_charger, charger_work);
 448         struct lp8788_charger_platform_data *pdata = pchg->pdata;
 449         enum lp8788_charger_event event = lp8788_is_charger_detected(pchg);
 450
 451         pdata->charger_event(pchg->lp, event);
 452 }
 453
 454 static bool lp8788_find_irq_id(struct lp8788_charger *pchg, int virq, int *id)
 455 {
 456         bool found;
 457         int i;
 458
 459         for (i = 0; i < pchg->num_irqs; i++) {
 460                 if (pchg->irqs[i].virq == virq) {
 461                         *id = pchg->irqs[i].which;
 462                         found = true;
 463                         break;
 464                 }
 465         }
 466
 467         return found;
 468 }
 469
 470 static irqreturn_t lp8788_charger_irq_thread(int virq, void *ptr)
 471 {
 472         struct lp8788_charger *pchg = ptr;
 473         struct lp8788_charger_platform_data *pdata = pchg->pdata;
 474         int id = -1;
 475
 476         if (!lp8788_find_irq_id(pchg, virq, &id))
 477                 return IRQ_NONE;
 478
 479         switch (id) {
 480         case LP8788_INT_CHG_INPUT_STATE:
 481         case LP8788_INT_CHG_STATE:
 482         case LP8788_INT_EOC:
 483         case LP8788_INT_BATT_LOW:
 484         case LP8788_INT_NO_BATT:
 485                 power_supply_changed(&pchg->charger);
 486                 power_supply_changed(&pchg->battery);
 487                 break;
 488         default:
 489                 break;
 490         }
 491
 492         /* report charger dectection event if used */
 493         if (!pdata)
 494                 goto irq_handled;
 495
 496         if (pdata->charger_event && id == LP8788_INT_CHG_INPUT_STATE)
 497                 schedule_work(&pchg->charger_work);
 498
 499 irq_handled:
 500         return IRQ_HANDLED;
 501 }
 502
 503 static int lp8788_set_irqs(struct platform_device *pdev,
 504                         struct lp8788_charger *pchg, const char *name)
 505 {
 506         struct resource *r;
 507         struct irq_domain *irqdm = pchg->lp->irqdm;
 508         int irq_start;
 509         int irq_end;
 510         int virq;
 511         int nr_irq;
 512         int i;
 513         int ret;
 514
 515         /* no error even if no irq resource */
 516         r = platform_get_resource_byname(pdev, IORESOURCE_IRQ, name);
 517         if (!r)
 518                 return 0;
 519
 520         irq_start = r->start;
 521         irq_end = r->end;
 522
 523         for (i = irq_start; i <= irq_end; i++) {
 524                 nr_irq = pchg->num_irqs;
 525
 526                 virq = irq_create_mapping(irqdm, i);
 527                 pchg->irqs[nr_irq].virq = virq;
 528                 pchg->irqs[nr_irq].which = i;
 529                 pchg->num_irqs++;
 530
 531                 ret = request_threaded_irq(virq, NULL,
 532                                         lp8788_charger_irq_thread,
 533                                         0, name, pchg);
 534                 if (ret)
 535                         break;
 536         }
 537
 538         if (i <= irq_end)
 539                 goto err_free_irq;
 540
 541         return 0;
 542
 543 err_free_irq:
 544         for (i = 0; i < pchg->num_irqs; i++)
 545                 free_irq(pchg->irqs[i].virq, pchg);
 546         return ret;
 547 }
 548
 549 static int lp8788_irq_register(struct platform_device *pdev,
 550                                 struct lp8788_charger *pchg)
 551 {
 552         struct lp8788 *lp = pchg->lp;
 553         const char *name[] = {
 554                 LP8788_CHG_IRQ, LP8788_PRSW_IRQ, LP8788_BATT_IRQ
 555         };
 556         int i;
 557         int ret;
 558
 559         INIT_WORK(&pchg->charger_work, lp8788_charger_event);
 560         pchg->num_irqs = 0;
 561
 562         for (i = 0; i < ARRAY_SIZE(name); i++) {
 563                 ret = lp8788_set_irqs(pdev, pchg, name[i]);
 564                 if (ret) {
 565                         dev_warn(lp->dev, "irq setup failed: %s\n", name[i]);
 566                         return ret;
 567                 }
 568         }
 569
 570         if (pchg->num_irqs > LP8788_MAX_CHG_IRQS) {
 571                 dev_err(lp->dev, "invalid total number of irqs: %d\n",
 572                         pchg->num_irqs);
 573                 return -EINVAL;
 574         }
 575
 576
 577         return 0;
 578 }
 579
 580 static void lp8788_irq_unregister(struct platform_device *pdev,
 581                                   struct lp8788_charger *pchg)
 582 {
 583         int i;
 584         int irq;
 585
 586         for (i = 0; i < pchg->num_irqs; i++) {
 587                 irq = pchg->irqs[i].virq;
 588                 if (!irq)
 589                         continue;
 590
 591                 free_irq(irq, pchg);
 592         }
 593 }
 594
 595 static void lp8788_setup_adc_channel(struct lp8788_charger *pchg)
 596 {
 597         struct lp8788_charger_platform_data *pdata = pchg->pdata;
 598         struct device *dev = pchg->lp->dev;
 599         struct iio_channel *chan;
 600         enum lp8788_adc_id id;
 601         const char *chan_name[LPADC_MAX] = {
 602                 [LPADC_VBATT_5P5] = "vbatt-5p5",
 603                 [LPADC_VBATT_6P0] = "vbatt-6p0",
 604                 [LPADC_VBATT_5P0] = "vbatt-5p0",
 605                 [LPADC_ADC1]      = "adc1",
 606                 [LPADC_ADC2]      = "adc2",
 607                 [LPADC_ADC3]      = "adc3",
 608                 [LPADC_ADC4]      = "adc4",
 609         };
 610
 611         if (!pdata)
 612                 return;
 613
 614         id = pdata->vbatt_adc;
 615         switch (id) {
 616         case LPADC_VBATT_5P5:
 617         case LPADC_VBATT_6P0:
 618         case LPADC_VBATT_5P0:
 619                 chan = iio_channel_get(NULL, chan_name[id]);
 620                 pchg->chan[LP8788_VBATT] = IS_ERR(chan) ? NULL : chan;
 621                 break;
 622         default:
 623                 dev_err(dev, "invalid ADC id for VBATT: %d\n", id);
 624                 pchg->chan[LP8788_VBATT] = NULL;
 625                 break;
 626         }
 627
 628         id = pdata->batt_temp_adc;
 629         switch (id) {
 630         case LPADC_ADC1:
 631         case LPADC_ADC2:
 632         case LPADC_ADC3:
 633         case LPADC_ADC4:
 634                 chan = iio_channel_get(NULL, chan_name[id]);
 635                 pchg->chan[LP8788_BATT_TEMP] = IS_ERR(chan) ? NULL : chan;
 636                 break;
 637         default:
 638                 dev_err(dev, "invalid ADC id for BATT_TEMP : %d\n", id);
 639                 pchg->chan[LP8788_BATT_TEMP] = NULL;
 640                 break;
 641         }
 642 }
 643
 644 static void lp8788_release_adc_channel(struct lp8788_charger *pchg)
 645 {
 646         int i;
 647
 648         for (i = 0; i < LP8788_NUM_CHG_ADC; i++) {
 649                 if (!pchg->chan[i])
 650                         continue;
 651
 652                 iio_channel_release(pchg->chan[i]);
 653                 pchg->chan[i] = NULL;
 654         }
 655 }
 656
 657 static ssize_t lp8788_show_charger_status(struct device *dev,
 658                                 struct device_attribute *attr, char *buf)
 659 {
 660         struct lp8788_charger *pchg = dev_get_drvdata(dev);
 661         enum lp8788_charging_state state;
 662         char *desc[LP8788_MAX_CHG_STATE] = {
 663                 [LP8788_OFF] = "CHARGER OFF",
 664                 [LP8788_WARM_UP] = "WARM UP",
 665                 [LP8788_LOW_INPUT] = "LOW INPUT STATE",
 666                 [LP8788_PRECHARGE] = "CHARGING - PRECHARGE",
 667                 [LP8788_CC] = "CHARGING - CC",
 668                 [LP8788_CV] = "CHARGING - CV",
 669                 [LP8788_MAINTENANCE] = "NO CHARGING - MAINTENANCE",
 670                 [LP8788_BATTERY_FAULT] = "BATTERY FAULT",
 671                 [LP8788_SYSTEM_SUPPORT] = "SYSTEM SUPPORT",
 672                 [LP8788_HIGH_CURRENT] = "HIGH CURRENT",
 673         };
 674         u8 data;
 675
 676         lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
 677         state = (data & LP8788_CHG_STATE_M) >> LP8788_CHG_STATE_S;
 678
 679         return scnprintf(buf, LP8788_BUF_SIZE, "%s\n", desc[state]);
 680 }
 681
 682 static ssize_t lp8788_show_eoc_time(struct device *dev,
 683                                 struct device_attribute *attr, char *buf)
 684 {
 685         struct lp8788_charger *pchg = dev_get_drvdata(dev);
 686         char *stime[] = { "400ms", "5min", "10min", "15min",
 687                         "20min", "25min", "30min" "No timeout" };
 688         u8 val;
 689
 690         lp8788_read_byte(pchg->lp, LP8788_CHG_EOC, &val);
 691         val = (val & LP8788_CHG_EOC_TIME_M) >> LP8788_CHG_EOC_TIME_S;
 692
 693         return scnprintf(buf, LP8788_BUF_SIZE, "End Of Charge Time: %s\n",
 694                         stime[val]);
 695 }
 696
 697 static ssize_t lp8788_show_eoc_level(struct device *dev,
 698                                 struct device_attribute *attr, char *buf)
 699 {
 700         struct lp8788_charger *pchg = dev_get_drvdata(dev);
 701         char *abs_level[] = { "25mA", "49mA", "75mA", "98mA" };
 702         char *relative_level[] = { "5%", "10%", "15%", "20%" };
 703         char *level;
 704         u8 val;
 705         u8 mode;
 706
 707         lp8788_read_byte(pchg->lp, LP8788_CHG_EOC, &val);
 708
 709         mode = val & LP8788_CHG_EOC_MODE_M;
 710         val = (val & LP8788_CHG_EOC_LEVEL_M) >> LP8788_CHG_EOC_LEVEL_S;
 711         level = mode ? abs_level[val] : relative_level[val];
 712
 713         return scnprintf(buf, LP8788_BUF_SIZE, "End Of Charge Level: %s\n",
 714                         level);
 715 }
 716
 717 static DEVICE_ATTR(charger_status, S_IRUSR, lp8788_show_charger_status, NULL);
 718 static DEVICE_ATTR(eoc_time, S_IRUSR, lp8788_show_eoc_time, NULL);
 719 static DEVICE_ATTR(eoc_level, S_IRUSR, lp8788_show_eoc_level, NULL);
 720
 721 static struct attribute *lp8788_charger_attr[] = {
 722         &dev_attr_charger_status.attr,
 723         &dev_attr_eoc_time.attr,
 724         &dev_attr_eoc_level.attr,
 725         NULL,
 726 };
 727
 728 static const struct attribute_group lp8788_attr_group = {
 729         .attrs = lp8788_charger_attr,
 730 };
 731
 732 static __devinit int lp8788_charger_probe(struct platform_device *pdev)
 733 {
 734         struct lp8788 *lp = dev_get_drvdata(pdev->dev.parent);
 735         struct lp8788_charger *pchg;
 736         int ret;
 737
 738         pchg = devm_kzalloc(lp->dev, sizeof(struct lp8788_charger), GFP_KERNEL);
 739         if (!pchg)
 740                 return -ENOMEM;
 741
 742         pchg->lp = lp;
 743         pchg->pdata = lp->pdata ? lp->pdata->chg_pdata : NULL;
 744         platform_set_drvdata(pdev, pchg);
 745
 746         ret = lp8788_update_charger_params(pchg);
 747         if (ret)
 748                 return ret;
 749
 750         lp8788_setup_adc_channel(pchg);
 751
 752         ret = lp8788_psy_register(pdev, pchg);
 753         if (ret)
 754                 return ret;
 755
 756         ret = sysfs_create_group(&pdev->dev.kobj, &lp8788_attr_group);
 757         if (ret) {
 758                 lp8788_psy_unregister(pchg);
 759                 return ret;
 760         }
 761
 762         ret = lp8788_irq_register(pdev, pchg);
 763         if (ret)
 764                 dev_warn(lp->dev, "failed to register charger irq: %d\n", ret);
 765
 766         return 0;
 767 }
 768
 769 static int __devexit lp8788_charger_remove(struct platform_device *pdev)
 770 {
 771         struct lp8788_charger *pchg = platform_get_drvdata(pdev);
 772
 773         flush_work(&pchg->charger_work);
 774         lp8788_irq_unregister(pdev, pchg);
 775         sysfs_remove_group(&pdev->dev.kobj, &lp8788_attr_group);
 776         lp8788_psy_unregister(pchg);
 777         lp8788_release_adc_channel(pchg);
 778
 779         return 0;
 780 }
 781
 782 static struct platform_driver lp8788_charger_driver = {
 783         .probe = lp8788_charger_probe,
 784         .remove = __devexit_p(lp8788_charger_remove),
 785         .driver = {
 786                 .name = LP8788_DEV_CHARGER,
 787                 .owner = THIS_MODULE,
 788         },
 789 };
 790 module_platform_driver(lp8788_charger_driver);
 791
 792 MODULE_DESCRIPTION("TI LP8788 Charger Driver");
 793 MODULE_AUTHOR("Milo Kim");
 794 MODULE_LICENSE("GPL");
 795 MODULE_ALIAS("platform:lp8788-charger");