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, int *result)
 239 {
 240         struct iio_channel *channel = pchg->chan[LP8788_VBATT];
 241
 242         if (!channel)
 243                 return -EINVAL;
 244
 245         return iio_read_channel_processed(channel, result);
 246 }
 247
 248 static int lp8788_get_battery_voltage(struct lp8788_charger *pchg,
 249                                 union power_supply_propval *val)
 250 {
 251         return lp8788_get_vbatt_adc(pchg, &val->intval);
 252 }
 253
 254 static int lp8788_get_battery_capacity(struct lp8788_charger *pchg,
 255                                 union power_supply_propval *val)
 256 {
 257         struct lp8788 *lp = pchg->lp;
 258         struct lp8788_charger_platform_data *pdata = pchg->pdata;
 259         unsigned int max_vbatt;
 260         int vbatt;
 261         enum lp8788_charging_state state;
 262         u8 data;
 263         int ret;
 264
 265         if (!pdata)
 266                 return -EINVAL;
 267
 268         max_vbatt = pdata->max_vbatt_mv;
 269         if (max_vbatt == 0)
 270                 return -EINVAL;
 271
 272         ret = lp8788_read_byte(lp, LP8788_CHG_STATUS, &data);
 273         if (ret)
 274                 return ret;
 275
 276         state = (data & LP8788_CHG_STATE_M) >> LP8788_CHG_STATE_S;
 277
 278         if (state == LP8788_MAINTENANCE) {
 279                 val->intval = LP8788_MAX_BATT_CAPACITY;
 280         } else {
 281                 ret = lp8788_get_vbatt_adc(pchg, &vbatt);
 282                 if (ret)
 283                         return ret;
 284
 285                 val->intval = (vbatt * LP8788_MAX_BATT_CAPACITY) / max_vbatt;
 286                 val->intval = min(val->intval, LP8788_MAX_BATT_CAPACITY);
 287         }
 288
 289         return 0;
 290 }
 291
 292 static int lp8788_get_battery_temperature(struct lp8788_charger *pchg,
 293                                 union power_supply_propval *val)
 294 {
 295         struct iio_channel *channel = pchg->chan[LP8788_BATT_TEMP];
 296         int result;
 297         int ret;
 298
 299         if (!channel)
 300                 return -EINVAL;
 301
 302         ret = iio_read_channel_processed(channel, &result);
 303         if (ret < 0)
 304                 return -EINVAL;
 305
 306         /* unit: 0.1 'C */
 307         val->intval = result * 10;
 308
 309         return 0;
 310 }
 311
 312 static int lp8788_get_battery_charging_current(struct lp8788_charger *pchg,
 313                                 union power_supply_propval *val)
 314 {
 315         u8 read;
 316
 317         lp8788_read_byte(pchg->lp, LP8788_CHG_IBATT, &read);
 318         read &= LP8788_CHG_IBATT_M;
 319         val->intval = LP8788_ISEL_STEP *
 320                         (min_t(int, read, LP8788_ISEL_MAX) + 1);
 321
 322         return 0;
 323 }
 324
 325 static int lp8788_get_charging_termination_voltage(struct lp8788_charger *pchg,
 326                                 union power_supply_propval *val)
 327 {
 328         u8 read;
 329
 330         lp8788_read_byte(pchg->lp, LP8788_CHG_VTERM, &read);
 331         read &= LP8788_CHG_VTERM_M;
 332         val->intval = LP8788_VTERM_MIN + LP8788_VTERM_STEP * read;
 333
 334         return 0;
 335 }
 336
 337 static int lp8788_battery_get_property(struct power_supply *psy,
 338                                         enum power_supply_property psp,
 339                                         union power_supply_propval *val)
 340 {
 341         struct lp8788_charger *pchg = dev_get_drvdata(psy->dev->parent);
 342
 343         switch (psp) {
 344         case POWER_SUPPLY_PROP_STATUS:
 345                 return lp8788_get_battery_status(pchg, val);
 346         case POWER_SUPPLY_PROP_HEALTH:
 347                 return lp8788_get_battery_health(pchg, val);
 348         case POWER_SUPPLY_PROP_PRESENT:
 349                 return lp8788_get_battery_present(pchg, val);
 350         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 351                 return lp8788_get_battery_voltage(pchg, val);
 352         case POWER_SUPPLY_PROP_CAPACITY:
 353                 return lp8788_get_battery_capacity(pchg, val);
 354         case POWER_SUPPLY_PROP_TEMP:
 355                 return lp8788_get_battery_temperature(pchg, val);
 356         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
 357                 return lp8788_get_battery_charging_current(pchg, val);
 358         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
 359                 return lp8788_get_charging_termination_voltage(pchg, val);
 360         default:
 361                 return -EINVAL;
 362         }
 363 }
 364
 365 static inline bool lp8788_is_valid_charger_register(u8 addr)
 366 {
 367         return addr >= LP8788_CHG_START && addr <= LP8788_CHG_END;
 368 }
 369
 370 static int lp8788_update_charger_params(struct platform_device *pdev,
 371                                         struct lp8788_charger *pchg)
 372 {
 373         struct lp8788 *lp = pchg->lp;
 374         struct lp8788_charger_platform_data *pdata = pchg->pdata;
 375         struct lp8788_chg_param *param;
 376         int i;
 377         int ret;
 378
 379         if (!pdata || !pdata->chg_params) {
 380                 dev_info(&pdev->dev, "skip updating charger parameters\n");
 381                 return 0;
 382         }
 383
 384         /* settting charging parameters */
 385         for (i = 0; i < pdata->num_chg_params; i++) {
 386                 param = pdata->chg_params + i;
 387
 388                 if (!param)
 389                         continue;
 390
 391                 if (lp8788_is_valid_charger_register(param->addr)) {
 392                         ret = lp8788_write_byte(lp, param->addr, param->val);
 393                         if (ret)
 394                                 return ret;
 395                 }
 396         }
 397
 398         return 0;
 399 }
 400
 401 static int lp8788_psy_register(struct platform_device *pdev,
 402                                 struct lp8788_charger *pchg)
 403 {
 404         pchg->charger.name = LP8788_CHARGER_NAME;
 405         pchg->charger.type = POWER_SUPPLY_TYPE_MAINS;
 406         pchg->charger.properties = lp8788_charger_prop;
 407         pchg->charger.num_properties = ARRAY_SIZE(lp8788_charger_prop);
 408         pchg->charger.get_property = lp8788_charger_get_property;
 409         pchg->charger.supplied_to = battery_supplied_to;
 410         pchg->charger.num_supplicants = ARRAY_SIZE(battery_supplied_to);
 411
 412         if (power_supply_register(&pdev->dev, &pchg->charger))
 413                 return -EPERM;
 414
 415         pchg->battery.name = LP8788_BATTERY_NAME;
 416         pchg->battery.type = POWER_SUPPLY_TYPE_BATTERY;
 417         pchg->battery.properties = lp8788_battery_prop;
 418         pchg->battery.num_properties = ARRAY_SIZE(lp8788_battery_prop);
 419         pchg->battery.get_property = lp8788_battery_get_property;
 420
 421         if (power_supply_register(&pdev->dev, &pchg->battery))
 422                 return -EPERM;
 423
 424         return 0;
 425 }
 426
 427 static void lp8788_psy_unregister(struct lp8788_charger *pchg)
 428 {
 429         power_supply_unregister(&pchg->battery);
 430         power_supply_unregister(&pchg->charger);
 431 }
 432
 433 static void lp8788_charger_event(struct work_struct *work)
 434 {
 435         struct lp8788_charger *pchg =
 436                 container_of(work, struct lp8788_charger, charger_work);
 437         struct lp8788_charger_platform_data *pdata = pchg->pdata;
 438         enum lp8788_charger_event event = lp8788_is_charger_detected(pchg);
 439
 440         pdata->charger_event(pchg->lp, event);
 441 }
 442
 443 static bool lp8788_find_irq_id(struct lp8788_charger *pchg, int virq, int *id)
 444 {
 445         bool found;
 446         int i;
 447
 448         for (i = 0; i < pchg->num_irqs; i++) {
 449                 if (pchg->irqs[i].virq == virq) {
 450                         *id = pchg->irqs[i].which;
 451                         found = true;
 452                         break;
 453                 }
 454         }
 455
 456         return found;
 457 }
 458
 459 static irqreturn_t lp8788_charger_irq_thread(int virq, void *ptr)
 460 {
 461         struct lp8788_charger *pchg = ptr;
 462         struct lp8788_charger_platform_data *pdata = pchg->pdata;
 463         int id = -1;
 464
 465         if (!lp8788_find_irq_id(pchg, virq, &id))
 466                 return IRQ_NONE;
 467
 468         switch (id) {
 469         case LP8788_INT_CHG_INPUT_STATE:
 470         case LP8788_INT_CHG_STATE:
 471         case LP8788_INT_EOC:
 472         case LP8788_INT_BATT_LOW:
 473         case LP8788_INT_NO_BATT:
 474                 power_supply_changed(&pchg->charger);
 475                 power_supply_changed(&pchg->battery);
 476                 break;
 477         default:
 478                 break;
 479         }
 480
 481         /* report charger dectection event if used */
 482         if (!pdata)
 483                 goto irq_handled;
 484
 485         if (pdata->charger_event && id == LP8788_INT_CHG_INPUT_STATE)
 486                 schedule_work(&pchg->charger_work);
 487
 488 irq_handled:
 489         return IRQ_HANDLED;
 490 }
 491
 492 static int lp8788_set_irqs(struct platform_device *pdev,
 493                         struct lp8788_charger *pchg, const char *name)
 494 {
 495         struct resource *r;
 496         struct irq_domain *irqdm = pchg->lp->irqdm;
 497         int irq_start;
 498         int irq_end;
 499         int virq;
 500         int nr_irq;
 501         int i;
 502         int ret;
 503
 504         /* no error even if no irq resource */
 505         r = platform_get_resource_byname(pdev, IORESOURCE_IRQ, name);
 506         if (!r)
 507                 return 0;
 508
 509         irq_start = r->start;
 510         irq_end = r->end;
 511
 512         for (i = irq_start; i <= irq_end; i++) {
 513                 nr_irq = pchg->num_irqs;
 514
 515                 virq = irq_create_mapping(irqdm, i);
 516                 pchg->irqs[nr_irq].virq = virq;
 517                 pchg->irqs[nr_irq].which = i;
 518                 pchg->num_irqs++;
 519
 520                 ret = request_threaded_irq(virq, NULL,
 521                                         lp8788_charger_irq_thread,
 522                                         0, name, pchg);
 523                 if (ret)
 524                         break;
 525         }
 526
 527         if (i <= irq_end)
 528                 goto err_free_irq;
 529
 530         return 0;
 531
 532 err_free_irq:
 533         for (i = 0; i < pchg->num_irqs; i++)
 534                 free_irq(pchg->irqs[i].virq, pchg);
 535         return ret;
 536 }
 537
 538 static int lp8788_irq_register(struct platform_device *pdev,
 539                                 struct lp8788_charger *pchg)
 540 {
 541         const char *name[] = {
 542                 LP8788_CHG_IRQ, LP8788_PRSW_IRQ, LP8788_BATT_IRQ
 543         };
 544         int i;
 545         int ret;
 546
 547         INIT_WORK(&pchg->charger_work, lp8788_charger_event);
 548         pchg->num_irqs = 0;
 549
 550         for (i = 0; i < ARRAY_SIZE(name); i++) {
 551                 ret = lp8788_set_irqs(pdev, pchg, name[i]);
 552                 if (ret) {
 553                         dev_warn(&pdev->dev, "irq setup failed: %s\n", name[i]);
 554                         return ret;
 555                 }
 556         }
 557
 558         if (pchg->num_irqs > LP8788_MAX_CHG_IRQS) {
 559                 dev_err(&pdev->dev, "invalid total number of irqs: %d\n",
 560                         pchg->num_irqs);
 561                 return -EINVAL;
 562         }
 563
 564
 565         return 0;
 566 }
 567
 568 static void lp8788_irq_unregister(struct platform_device *pdev,
 569                                   struct lp8788_charger *pchg)
 570 {
 571         int i;
 572         int irq;
 573
 574         for (i = 0; i < pchg->num_irqs; i++) {
 575                 irq = pchg->irqs[i].virq;
 576                 if (!irq)
 577                         continue;
 578
 579                 free_irq(irq, pchg);
 580         }
 581 }
 582
 583 static void lp8788_setup_adc_channel(struct device *dev,
 584                                 struct lp8788_charger *pchg)
 585 {
 586         struct lp8788_charger_platform_data *pdata = pchg->pdata;
 587         struct iio_channel *chan;
 588
 589         if (!pdata)
 590                 return;
 591
 592         /* ADC channel for battery voltage */
 593         chan = iio_channel_get(dev, pdata->adc_vbatt);
 594         pchg->chan[LP8788_VBATT] = IS_ERR(chan) ? NULL : chan;
 595
 596         /* ADC channel for battery temperature */
 597         chan = iio_channel_get(dev, pdata->adc_batt_temp);
 598         pchg->chan[LP8788_BATT_TEMP] = IS_ERR(chan) ? NULL : chan;
 599 }
 600
 601 static void lp8788_release_adc_channel(struct lp8788_charger *pchg)
 602 {
 603         int i;
 604
 605         for (i = 0; i < LP8788_NUM_CHG_ADC; i++) {
 606                 if (!pchg->chan[i])
 607                         continue;
 608
 609                 iio_channel_release(pchg->chan[i]);
 610                 pchg->chan[i] = NULL;
 611         }
 612 }
 613
 614 static ssize_t lp8788_show_charger_status(struct device *dev,
 615                                 struct device_attribute *attr, char *buf)
 616 {
 617         struct lp8788_charger *pchg = dev_get_drvdata(dev);
 618         enum lp8788_charging_state state;
 619         char *desc[LP8788_MAX_CHG_STATE] = {
 620                 [LP8788_OFF] = "CHARGER OFF",
 621                 [LP8788_WARM_UP] = "WARM UP",
 622                 [LP8788_LOW_INPUT] = "LOW INPUT STATE",
 623                 [LP8788_PRECHARGE] = "CHARGING - PRECHARGE",
 624                 [LP8788_CC] = "CHARGING - CC",
 625                 [LP8788_CV] = "CHARGING - CV",
 626                 [LP8788_MAINTENANCE] = "NO CHARGING - MAINTENANCE",
 627                 [LP8788_BATTERY_FAULT] = "BATTERY FAULT",
 628                 [LP8788_SYSTEM_SUPPORT] = "SYSTEM SUPPORT",
 629                 [LP8788_HIGH_CURRENT] = "HIGH CURRENT",
 630         };
 631         u8 data;
 632
 633         lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
 634         state = (data & LP8788_CHG_STATE_M) >> LP8788_CHG_STATE_S;
 635
 636         return scnprintf(buf, LP8788_BUF_SIZE, "%s\n", desc[state]);
 637 }
 638
 639 static ssize_t lp8788_show_eoc_time(struct device *dev,
 640                                 struct device_attribute *attr, char *buf)
 641 {
 642         struct lp8788_charger *pchg = dev_get_drvdata(dev);
 643         char *stime[] = { "400ms", "5min", "10min", "15min",
 644                         "20min", "25min", "30min" "No timeout" };
 645         u8 val;
 646
 647         lp8788_read_byte(pchg->lp, LP8788_CHG_EOC, &val);
 648         val = (val & LP8788_CHG_EOC_TIME_M) >> LP8788_CHG_EOC_TIME_S;
 649
 650         return scnprintf(buf, LP8788_BUF_SIZE, "End Of Charge Time: %s\n",
 651                         stime[val]);
 652 }
 653
 654 static ssize_t lp8788_show_eoc_level(struct device *dev,
 655                                 struct device_attribute *attr, char *buf)
 656 {
 657         struct lp8788_charger *pchg = dev_get_drvdata(dev);
 658         char *abs_level[] = { "25mA", "49mA", "75mA", "98mA" };
 659         char *relative_level[] = { "5%", "10%", "15%", "20%" };
 660         char *level;
 661         u8 val;
 662         u8 mode;
 663
 664         lp8788_read_byte(pchg->lp, LP8788_CHG_EOC, &val);
 665
 666         mode = val & LP8788_CHG_EOC_MODE_M;
 667         val = (val & LP8788_CHG_EOC_LEVEL_M) >> LP8788_CHG_EOC_LEVEL_S;
 668         level = mode ? abs_level[val] : relative_level[val];
 669
 670         return scnprintf(buf, LP8788_BUF_SIZE, "End Of Charge Level: %s\n",
 671                         level);
 672 }
 673
 674 static DEVICE_ATTR(charger_status, S_IRUSR, lp8788_show_charger_status, NULL);
 675 static DEVICE_ATTR(eoc_time, S_IRUSR, lp8788_show_eoc_time, NULL);
 676 static DEVICE_ATTR(eoc_level, S_IRUSR, lp8788_show_eoc_level, NULL);
 677
 678 static struct attribute *lp8788_charger_attr[] = {
 679         &dev_attr_charger_status.attr,
 680         &dev_attr_eoc_time.attr,
 681         &dev_attr_eoc_level.attr,
 682         NULL,
 683 };
 684
 685 static const struct attribute_group lp8788_attr_group = {
 686         .attrs = lp8788_charger_attr,
 687 };
 688
 689 static int lp8788_charger_probe(struct platform_device *pdev)
 690 {
 691         struct lp8788 *lp = dev_get_drvdata(pdev->dev.parent);
 692         struct lp8788_charger *pchg;
 693         struct device *dev = &pdev->dev;
 694         int ret;
 695
 696         pchg = devm_kzalloc(dev, sizeof(struct lp8788_charger), GFP_KERNEL);
 697         if (!pchg)
 698                 return -ENOMEM;
 699
 700         pchg->lp = lp;
 701         pchg->pdata = lp->pdata ? lp->pdata->chg_pdata : NULL;
 702         platform_set_drvdata(pdev, pchg);
 703
 704         ret = lp8788_update_charger_params(pdev, pchg);
 705         if (ret)
 706                 return ret;
 707
 708         lp8788_setup_adc_channel(&pdev->dev, pchg);
 709
 710         ret = lp8788_psy_register(pdev, pchg);
 711         if (ret)
 712                 return ret;
 713
 714         ret = sysfs_create_group(&pdev->dev.kobj, &lp8788_attr_group);
 715         if (ret) {
 716                 lp8788_psy_unregister(pchg);
 717                 return ret;
 718         }
 719
 720         ret = lp8788_irq_register(pdev, pchg);
 721         if (ret)
 722                 dev_warn(dev, "failed to register charger irq: %d\n", ret);
 723
 724         return 0;
 725 }
 726
 727 static int lp8788_charger_remove(struct platform_device *pdev)
 728 {
 729         struct lp8788_charger *pchg = platform_get_drvdata(pdev);
 730
 731         flush_work(&pchg->charger_work);
 732         lp8788_irq_unregister(pdev, pchg);
 733         sysfs_remove_group(&pdev->dev.kobj, &lp8788_attr_group);
 734         lp8788_psy_unregister(pchg);
 735         lp8788_release_adc_channel(pchg);
 736
 737         return 0;
 738 }
 739
 740 static struct platform_driver lp8788_charger_driver = {
 741         .probe = lp8788_charger_probe,
 742         .remove = lp8788_charger_remove,
 743         .driver = {
 744                 .name = LP8788_DEV_CHARGER,
 745                 .owner = THIS_MODULE,
 746         },
 747 };
 748 module_platform_driver(lp8788_charger_driver);
 749
 750 MODULE_DESCRIPTION("TI LP8788 Charger Driver");
 751 MODULE_AUTHOR("Milo Kim");
 752 MODULE_LICENSE("GPL");
 753 MODULE_ALIAS("platform:lp8788-charger");