drivers/power/sbs-battery.c

   1 /*
   2  * Gas Gauge driver for SBS Compliant Batteries
   3  *
   4  * Copyright (c) 2010, NVIDIA Corporation.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14  * more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  19  */
  20
  21 #include <linux/init.h>
  22 #include <linux/module.h>
  23 #include <linux/kernel.h>
  24 #include <linux/err.h>
  25 #include <linux/power_supply.h>
  26 #include <linux/i2c.h>
  27 #include <linux/slab.h>
  28 #include <linux/interrupt.h>
  29 #include <linux/gpio.h>
  30 #include <linux/of.h>
  31
  32 #include <linux/power/sbs-battery.h>
  33
  34 enum {
  35         REG_MANUFACTURER_DATA,
  36         REG_TEMPERATURE,
  37         REG_VOLTAGE,
  38         REG_CURRENT,
  39         REG_CAPACITY,
  40         REG_TIME_TO_EMPTY,
  41         REG_TIME_TO_FULL,
  42         REG_STATUS,
  43         REG_CYCLE_COUNT,
  44         REG_SERIAL_NUMBER,
  45         REG_REMAINING_CAPACITY,
  46         REG_REMAINING_CAPACITY_CHARGE,
  47         REG_FULL_CHARGE_CAPACITY,
  48         REG_FULL_CHARGE_CAPACITY_CHARGE,
  49         REG_DESIGN_CAPACITY,
  50         REG_DESIGN_CAPACITY_CHARGE,
  51         REG_DESIGN_VOLTAGE,
  52 };
  53
  54 /* Battery Mode defines */
  55 #define BATTERY_MODE_OFFSET             0x03
  56 #define BATTERY_MODE_MASK               0x8000
  57 enum sbs_battery_mode {
  58         BATTERY_MODE_AMPS,
  59         BATTERY_MODE_WATTS
  60 };
  61
  62 /* manufacturer access defines */
  63 #define MANUFACTURER_ACCESS_STATUS      0x0006
  64 #define MANUFACTURER_ACCESS_SLEEP       0x0011
  65
  66 /* battery status value bits */
  67 #define BATTERY_DISCHARGING             0x40
  68 #define BATTERY_FULL_CHARGED            0x20
  69 #define BATTERY_FULL_DISCHARGED         0x10
  70
  71 #define SBS_DATA(_psp, _addr, _min_value, _max_value) { \
  72         .psp = _psp, \
  73         .addr = _addr, \
  74         .min_value = _min_value, \
  75         .max_value = _max_value, \
  76 }
  77
  78 static const struct chip_data {
  79         enum power_supply_property psp;
  80         u8 addr;
  81         int min_value;
  82         int max_value;
  83 } sbs_data[] = {
  84         [REG_MANUFACTURER_DATA] =
  85                 SBS_DATA(POWER_SUPPLY_PROP_PRESENT, 0x00, 0, 65535),
  86         [REG_TEMPERATURE] =
  87                 SBS_DATA(POWER_SUPPLY_PROP_TEMP, 0x08, 0, 65535),
  88         [REG_VOLTAGE] =
  89                 SBS_DATA(POWER_SUPPLY_PROP_VOLTAGE_NOW, 0x09, 0, 20000),
  90         [REG_CURRENT] =
  91                 SBS_DATA(POWER_SUPPLY_PROP_CURRENT_NOW, 0x0A, -32768, 32767),
  92         [REG_CAPACITY] =
  93                 SBS_DATA(POWER_SUPPLY_PROP_CAPACITY, 0x0D, 0, 100),
  94         [REG_REMAINING_CAPACITY] =
  95                 SBS_DATA(POWER_SUPPLY_PROP_ENERGY_NOW, 0x0F, 0, 65535),
  96         [REG_REMAINING_CAPACITY_CHARGE] =
  97                 SBS_DATA(POWER_SUPPLY_PROP_CHARGE_NOW, 0x0F, 0, 65535),
  98         [REG_FULL_CHARGE_CAPACITY] =
  99                 SBS_DATA(POWER_SUPPLY_PROP_ENERGY_FULL, 0x10, 0, 65535),
 100         [REG_FULL_CHARGE_CAPACITY_CHARGE] =
 101                 SBS_DATA(POWER_SUPPLY_PROP_CHARGE_FULL, 0x10, 0, 65535),
 102         [REG_TIME_TO_EMPTY] =
 103                 SBS_DATA(POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG, 0x12, 0, 65535),
 104         [REG_TIME_TO_FULL] =
 105                 SBS_DATA(POWER_SUPPLY_PROP_TIME_TO_FULL_AVG, 0x13, 0, 65535),
 106         [REG_STATUS] =
 107                 SBS_DATA(POWER_SUPPLY_PROP_STATUS, 0x16, 0, 65535),
 108         [REG_CYCLE_COUNT] =
 109                 SBS_DATA(POWER_SUPPLY_PROP_CYCLE_COUNT, 0x17, 0, 65535),
 110         [REG_DESIGN_CAPACITY] =
 111                 SBS_DATA(POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN, 0x18, 0, 65535),
 112         [REG_DESIGN_CAPACITY_CHARGE] =
 113                 SBS_DATA(POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 0x18, 0, 65535),
 114         [REG_DESIGN_VOLTAGE] =
 115                 SBS_DATA(POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, 0x19, 0, 65535),
 116         [REG_SERIAL_NUMBER] =
 117                 SBS_DATA(POWER_SUPPLY_PROP_SERIAL_NUMBER, 0x1C, 0, 65535),
 118 };
 119
 120 static enum power_supply_property sbs_properties[] = {
 121         POWER_SUPPLY_PROP_STATUS,
 122         POWER_SUPPLY_PROP_HEALTH,
 123         POWER_SUPPLY_PROP_PRESENT,
 124         POWER_SUPPLY_PROP_TECHNOLOGY,
 125         POWER_SUPPLY_PROP_CYCLE_COUNT,
 126         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 127         POWER_SUPPLY_PROP_CURRENT_NOW,
 128         POWER_SUPPLY_PROP_CAPACITY,
 129         POWER_SUPPLY_PROP_TEMP,
 130         POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
 131         POWER_SUPPLY_PROP_TIME_TO_FULL_AVG,
 132         POWER_SUPPLY_PROP_SERIAL_NUMBER,
 133         POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
 134         POWER_SUPPLY_PROP_ENERGY_NOW,
 135         POWER_SUPPLY_PROP_ENERGY_FULL,
 136         POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
 137         POWER_SUPPLY_PROP_CHARGE_NOW,
 138         POWER_SUPPLY_PROP_CHARGE_FULL,
 139         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 140 };
 141
 142 struct sbs_info {
 143         struct i2c_client               *client;
 144         struct power_supply             power_supply;
 145         struct sbs_platform_data        *pdata;
 146         bool                            is_present;
 147         bool                            gpio_detect;
 148         bool                            enable_detection;
 149         int                             irq;
 150         int                             last_state;
 151         int                             poll_time;
 152         struct delayed_work             work;
 153         int                             ignore_changes;
 154 };
 155
 156 static int sbs_read_word_data(struct i2c_client *client, u8 address)
 157 {
 158         struct sbs_info *chip = i2c_get_clientdata(client);
 159         s32 ret = 0;
 160         int retries = 1;
 161
 162         if (chip->pdata)
 163                 retries = max(chip->pdata->i2c_retry_count + 1, 1);
 164
 165         while (retries > 0) {
 166                 ret = i2c_smbus_read_word_data(client, address);
 167                 if (ret >= 0)
 168                         break;
 169                 retries--;
 170         }
 171
 172         if (ret < 0) {
 173                 dev_dbg(&client->dev,
 174                         "%s: i2c read at address 0x%x failed\n",
 175                         __func__, address);
 176                 return ret;
 177         }
 178
 179         return le16_to_cpu(ret);
 180 }
 181
 182 static int sbs_write_word_data(struct i2c_client *client, u8 address,
 183         u16 value)
 184 {
 185         struct sbs_info *chip = i2c_get_clientdata(client);
 186         s32 ret = 0;
 187         int retries = 1;
 188
 189         if (chip->pdata)
 190                 retries = max(chip->pdata->i2c_retry_count + 1, 1);
 191
 192         while (retries > 0) {
 193                 ret = i2c_smbus_write_word_data(client, address,
 194                         le16_to_cpu(value));
 195                 if (ret >= 0)
 196                         break;
 197                 retries--;
 198         }
 199
 200         if (ret < 0) {
 201                 dev_dbg(&client->dev,
 202                         "%s: i2c write to address 0x%x failed\n",
 203                         __func__, address);
 204                 return ret;
 205         }
 206
 207         return 0;
 208 }
 209
 210 static int sbs_get_battery_presence_and_health(
 211         struct i2c_client *client, enum power_supply_property psp,
 212         union power_supply_propval *val)
 213 {
 214         s32 ret;
 215         struct sbs_info *chip = i2c_get_clientdata(client);
 216
 217         if (psp == POWER_SUPPLY_PROP_PRESENT &&
 218                 chip->gpio_detect) {
 219                 ret = gpio_get_value(chip->pdata->battery_detect);
 220                 if (ret == chip->pdata->battery_detect_present)
 221                         val->intval = 1;
 222                 else
 223                         val->intval = 0;
 224                 chip->is_present = val->intval;
 225                 return ret;
 226         }
 227
 228         /* Write to ManufacturerAccess with
 229          * ManufacturerAccess command and then
 230          * read the status */
 231         ret = sbs_write_word_data(client, sbs_data[REG_MANUFACTURER_DATA].addr,
 232                                         MANUFACTURER_ACCESS_STATUS);
 233         if (ret < 0) {
 234                 if (psp == POWER_SUPPLY_PROP_PRESENT)
 235                         val->intval = 0; /* battery removed */
 236                 return ret;
 237         }
 238
 239         ret = sbs_read_word_data(client, sbs_data[REG_MANUFACTURER_DATA].addr);
 240         if (ret < 0)
 241                 return ret;
 242
 243         if (ret < sbs_data[REG_MANUFACTURER_DATA].min_value ||
 244             ret > sbs_data[REG_MANUFACTURER_DATA].max_value) {
 245                 val->intval = 0;
 246                 return 0;
 247         }
 248
 249         /* Mask the upper nibble of 2nd byte and
 250          * lower byte of response then
 251          * shift the result by 8 to get status*/
 252         ret &= 0x0F00;
 253         ret >>= 8;
 254         if (psp == POWER_SUPPLY_PROP_PRESENT) {
 255                 if (ret == 0x0F)
 256                         /* battery removed */
 257                         val->intval = 0;
 258                 else
 259                         val->intval = 1;
 260         } else if (psp == POWER_SUPPLY_PROP_HEALTH) {
 261                 if (ret == 0x09)
 262                         val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
 263                 else if (ret == 0x0B)
 264                         val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
 265                 else if (ret == 0x0C)
 266                         val->intval = POWER_SUPPLY_HEALTH_DEAD;
 267                 else
 268                         val->intval = POWER_SUPPLY_HEALTH_GOOD;
 269         }
 270
 271         return 0;
 272 }
 273
 274 static int sbs_get_battery_property(struct i2c_client *client,
 275         int reg_offset, enum power_supply_property psp,
 276         union power_supply_propval *val)
 277 {
 278         struct sbs_info *chip = i2c_get_clientdata(client);
 279         s32 ret;
 280
 281         ret = sbs_read_word_data(client, sbs_data[reg_offset].addr);
 282         if (ret < 0)
 283                 return ret;
 284
 285         /* returned values are 16 bit */
 286         if (sbs_data[reg_offset].min_value < 0)
 287                 ret = (s16)ret;
 288
 289         if (ret >= sbs_data[reg_offset].min_value &&
 290             ret <= sbs_data[reg_offset].max_value) {
 291                 val->intval = ret;
 292                 if (psp != POWER_SUPPLY_PROP_STATUS)
 293                         return 0;
 294
 295                 if (ret & BATTERY_FULL_CHARGED)
 296                         val->intval = POWER_SUPPLY_STATUS_FULL;
 297                 else if (ret & BATTERY_FULL_DISCHARGED)
 298                         val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
 299                 else if (ret & BATTERY_DISCHARGING)
 300                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 301                 else
 302                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
 303
 304                 if (chip->poll_time == 0)
 305                         chip->last_state = val->intval;
 306                 else if (chip->last_state != val->intval) {
 307                         cancel_delayed_work_sync(&chip->work);
 308                         power_supply_changed(&chip->power_supply);
 309                         chip->poll_time = 0;
 310                 }
 311         } else {
 312                 if (psp == POWER_SUPPLY_PROP_STATUS)
 313                         val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
 314                 else
 315                         val->intval = 0;
 316         }
 317
 318         return 0;
 319 }
 320
 321 static void  sbs_unit_adjustment(struct i2c_client *client,
 322         enum power_supply_property psp, union power_supply_propval *val)
 323 {
 324 #define BASE_UNIT_CONVERSION            1000
 325 #define BATTERY_MODE_CAP_MULT_WATT      (10 * BASE_UNIT_CONVERSION)
 326 #define TIME_UNIT_CONVERSION            60
 327 #define TEMP_KELVIN_TO_CELSIUS          2731
 328         switch (psp) {
 329         case POWER_SUPPLY_PROP_ENERGY_NOW:
 330         case POWER_SUPPLY_PROP_ENERGY_FULL:
 331         case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
 332                 /* sbs provides energy in units of 10mWh.
 333                  * Convert to µWh
 334                  */
 335                 val->intval *= BATTERY_MODE_CAP_MULT_WATT;
 336                 break;
 337
 338         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 339         case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
 340         case POWER_SUPPLY_PROP_CURRENT_NOW:
 341         case POWER_SUPPLY_PROP_CHARGE_NOW:
 342         case POWER_SUPPLY_PROP_CHARGE_FULL:
 343         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 344                 val->intval *= BASE_UNIT_CONVERSION;
 345                 break;
 346
 347         case POWER_SUPPLY_PROP_TEMP:
 348                 /* sbs provides battery temperature in 0.1K
 349                  * so convert it to 0.1°C
 350                  */
 351                 val->intval -= TEMP_KELVIN_TO_CELSIUS;
 352                 break;
 353
 354         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
 355         case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG:
 356                 /* sbs provides time to empty and time to full in minutes.
 357                  * Convert to seconds
 358                  */
 359                 val->intval *= TIME_UNIT_CONVERSION;
 360                 break;
 361
 362         default:
 363                 dev_dbg(&client->dev,
 364                         "%s: no need for unit conversion %d\n", __func__, psp);
 365         }
 366 }
 367
 368 static enum sbs_battery_mode sbs_set_battery_mode(struct i2c_client *client,
 369         enum sbs_battery_mode mode)
 370 {
 371         int ret, original_val;
 372
 373         original_val = sbs_read_word_data(client, BATTERY_MODE_OFFSET);
 374         if (original_val < 0)
 375                 return original_val;
 376
 377         if ((original_val & BATTERY_MODE_MASK) == mode)
 378                 return mode;
 379
 380         if (mode == BATTERY_MODE_AMPS)
 381                 ret = original_val & ~BATTERY_MODE_MASK;
 382         else
 383                 ret = original_val | BATTERY_MODE_MASK;
 384
 385         ret = sbs_write_word_data(client, BATTERY_MODE_OFFSET, ret);
 386         if (ret < 0)
 387                 return ret;
 388
 389         return original_val & BATTERY_MODE_MASK;
 390 }
 391
 392 static int sbs_get_battery_capacity(struct i2c_client *client,
 393         int reg_offset, enum power_supply_property psp,
 394         union power_supply_propval *val)
 395 {
 396         s32 ret;
 397         enum sbs_battery_mode mode = BATTERY_MODE_WATTS;
 398
 399         if (power_supply_is_amp_property(psp))
 400                 mode = BATTERY_MODE_AMPS;
 401
 402         mode = sbs_set_battery_mode(client, mode);
 403         if (mode < 0)
 404                 return mode;
 405
 406         ret = sbs_read_word_data(client, sbs_data[reg_offset].addr);
 407         if (ret < 0)
 408                 return ret;
 409
 410         if (psp == POWER_SUPPLY_PROP_CAPACITY) {
 411                 /* sbs spec says that this can be >100 %
 412                 * even if max value is 100 % */
 413                 val->intval = min(ret, 100);
 414         } else
 415                 val->intval = ret;
 416
 417         ret = sbs_set_battery_mode(client, mode);
 418         if (ret < 0)
 419                 return ret;
 420
 421         return 0;
 422 }
 423
 424 static char sbs_serial[5];
 425 static int sbs_get_battery_serial_number(struct i2c_client *client,
 426         union power_supply_propval *val)
 427 {
 428         int ret;
 429
 430         ret = sbs_read_word_data(client, sbs_data[REG_SERIAL_NUMBER].addr);
 431         if (ret < 0)
 432                 return ret;
 433
 434         ret = sprintf(sbs_serial, "%04x", ret);
 435         val->strval = sbs_serial;
 436
 437         return 0;
 438 }
 439
 440 static int sbs_get_property_index(struct i2c_client *client,
 441         enum power_supply_property psp)
 442 {
 443         int count;
 444         for (count = 0; count < ARRAY_SIZE(sbs_data); count++)
 445                 if (psp == sbs_data[count].psp)
 446                         return count;
 447
 448         dev_warn(&client->dev,
 449                 "%s: Invalid Property - %d\n", __func__, psp);
 450
 451         return -EINVAL;
 452 }
 453
 454 static int sbs_get_property(struct power_supply *psy,
 455         enum power_supply_property psp,
 456         union power_supply_propval *val)
 457 {
 458         int ret = 0;
 459         struct sbs_info *chip = container_of(psy,
 460                                 struct sbs_info, power_supply);
 461         struct i2c_client *client = chip->client;
 462
 463         switch (psp) {
 464         case POWER_SUPPLY_PROP_PRESENT:
 465         case POWER_SUPPLY_PROP_HEALTH:
 466                 ret = sbs_get_battery_presence_and_health(client, psp, val);
 467                 if (psp == POWER_SUPPLY_PROP_PRESENT)
 468                         return 0;
 469                 break;
 470
 471         case POWER_SUPPLY_PROP_TECHNOLOGY:
 472                 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
 473                 goto done; /* don't trigger power_supply_changed()! */
 474
 475         case POWER_SUPPLY_PROP_ENERGY_NOW:
 476         case POWER_SUPPLY_PROP_ENERGY_FULL:
 477         case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
 478         case POWER_SUPPLY_PROP_CHARGE_NOW:
 479         case POWER_SUPPLY_PROP_CHARGE_FULL:
 480         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 481         case POWER_SUPPLY_PROP_CAPACITY:
 482                 ret = sbs_get_property_index(client, psp);
 483                 if (ret < 0)
 484                         break;
 485
 486                 ret = sbs_get_battery_capacity(client, ret, psp, val);
 487                 break;
 488
 489         case POWER_SUPPLY_PROP_SERIAL_NUMBER:
 490                 ret = sbs_get_battery_serial_number(client, val);
 491                 break;
 492
 493         case POWER_SUPPLY_PROP_STATUS:
 494         case POWER_SUPPLY_PROP_CYCLE_COUNT:
 495         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 496         case POWER_SUPPLY_PROP_CURRENT_NOW:
 497         case POWER_SUPPLY_PROP_TEMP:
 498         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
 499         case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG:
 500         case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
 501                 ret = sbs_get_property_index(client, psp);
 502                 if (ret < 0)
 503                         break;
 504
 505                 ret = sbs_get_battery_property(client, ret, psp, val);
 506                 break;
 507
 508         default:
 509                 dev_err(&client->dev,
 510                         "%s: INVALID property\n", __func__);
 511                 return -EINVAL;
 512         }
 513
 514         if (!chip->enable_detection)
 515                 goto done;
 516
 517         if (!chip->gpio_detect &&
 518                 chip->is_present != (ret >= 0)) {
 519                 chip->is_present = (ret >= 0);
 520                 power_supply_changed(&chip->power_supply);
 521         }
 522
 523 done:
 524         if (!ret) {
 525                 /* Convert units to match requirements for power supply class */
 526                 sbs_unit_adjustment(client, psp, val);
 527         }
 528
 529         dev_dbg(&client->dev,
 530                 "%s: property = %d, value = %x\n", __func__, psp, val->intval);
 531
 532         if (ret && chip->is_present)
 533                 return ret;
 534
 535         /* battery not present, so return NODATA for properties */
 536         if (ret)
 537                 return -ENODATA;
 538
 539         return 0;
 540 }
 541
 542 static irqreturn_t sbs_irq(int irq, void *devid)
 543 {
 544         struct power_supply *battery = devid;
 545
 546         power_supply_changed(battery);
 547
 548         return IRQ_HANDLED;
 549 }
 550
 551 static void sbs_external_power_changed(struct power_supply *psy)
 552 {
 553         struct sbs_info *chip;
 554
 555         chip = container_of(psy, struct sbs_info, power_supply);
 556
 557         if (chip->ignore_changes > 0) {
 558                 chip->ignore_changes--;
 559                 return;
 560         }
 561
 562         /* cancel outstanding work */
 563         cancel_delayed_work_sync(&chip->work);
 564
 565         schedule_delayed_work(&chip->work, HZ);
 566         chip->poll_time = chip->pdata->poll_retry_count;
 567 }
 568
 569 static void sbs_delayed_work(struct work_struct *work)
 570 {
 571         struct sbs_info *chip;
 572         s32 ret;
 573
 574         chip = container_of(work, struct sbs_info, work.work);
 575
 576         ret = sbs_read_word_data(chip->client, sbs_data[REG_STATUS].addr);
 577         /* if the read failed, give up on this work */
 578         if (ret < 0) {
 579                 chip->poll_time = 0;
 580                 return;
 581         }
 582
 583         if (ret & BATTERY_FULL_CHARGED)
 584                 ret = POWER_SUPPLY_STATUS_FULL;
 585         else if (ret & BATTERY_FULL_DISCHARGED)
 586                 ret = POWER_SUPPLY_STATUS_NOT_CHARGING;
 587         else if (ret & BATTERY_DISCHARGING)
 588                 ret = POWER_SUPPLY_STATUS_DISCHARGING;
 589         else
 590                 ret = POWER_SUPPLY_STATUS_CHARGING;
 591
 592         if (chip->last_state != ret) {
 593                 chip->poll_time = 0;
 594                 power_supply_changed(&chip->power_supply);
 595                 return;
 596         }
 597         if (chip->poll_time > 0) {
 598                 schedule_delayed_work(&chip->work, HZ);
 599                 chip->poll_time--;
 600                 return;
 601         }
 602 }
 603
 604 #if defined(CONFIG_OF)
 605
 606 #include <linux/of_device.h>
 607 #include <linux/of_gpio.h>
 608
 609 static const struct of_device_id sbs_dt_ids[] = {
 610         { .compatible = "sbs,sbs-battery" },
 611         { .compatible = "ti,bq20z75" },
 612         { }
 613 };
 614 MODULE_DEVICE_TABLE(of, sbs_dt_ids);
 615
 616 static struct sbs_platform_data *sbs_of_populate_pdata(
 617                 struct i2c_client *client)
 618 {
 619         struct device_node *of_node = client->dev.of_node;
 620         struct sbs_platform_data *pdata = client->dev.platform_data;
 621         enum of_gpio_flags gpio_flags;
 622         int rc;
 623         u32 prop;
 624
 625         /* verify this driver matches this device */
 626         if (!of_node)
 627                 return NULL;
 628
 629         /* if platform data is set, honor it */
 630         if (pdata)
 631                 return pdata;
 632
 633         /* first make sure at least one property is set, otherwise
 634          * it won't change behavior from running without pdata.
 635          */
 636         if (!of_get_property(of_node, "sbs,i2c-retry-count", NULL) &&
 637                 !of_get_property(of_node, "sbs,poll-retry-count", NULL) &&
 638                 !of_get_property(of_node, "sbs,battery-detect-gpios", NULL))
 639                 goto of_out;
 640
 641         pdata = devm_kzalloc(&client->dev, sizeof(struct sbs_platform_data),
 642                                 GFP_KERNEL);
 643         if (!pdata)
 644                 goto of_out;
 645
 646         rc = of_property_read_u32(of_node, "sbs,i2c-retry-count", &prop);
 647         if (!rc)
 648                 pdata->i2c_retry_count = prop;
 649
 650         rc = of_property_read_u32(of_node, "sbs,poll-retry-count", &prop);
 651         if (!rc)
 652                 pdata->poll_retry_count = prop;
 653
 654         if (!of_get_property(of_node, "sbs,battery-detect-gpios", NULL)) {
 655                 pdata->battery_detect = -1;
 656                 goto of_out;
 657         }
 658
 659         pdata->battery_detect = of_get_named_gpio_flags(of_node,
 660                         "sbs,battery-detect-gpios", 0, &gpio_flags);
 661
 662         if (gpio_flags & OF_GPIO_ACTIVE_LOW)
 663                 pdata->battery_detect_present = 0;
 664         else
 665                 pdata->battery_detect_present = 1;
 666
 667 of_out:
 668         return pdata;
 669 }
 670 #else
 671 static struct sbs_platform_data *sbs_of_populate_pdata(
 672         struct i2c_client *client)
 673 {
 674         return client->dev.platform_data;
 675 }
 676 #endif
 677
 678 static int sbs_probe(struct i2c_client *client,
 679         const struct i2c_device_id *id)
 680 {
 681         struct sbs_info *chip;
 682         struct sbs_platform_data *pdata = client->dev.platform_data;
 683         int rc;
 684         int irq;
 685         char *name;
 686
 687         name = kasprintf(GFP_KERNEL, "sbs-%s", dev_name(&client->dev));
 688         if (!name) {
 689                 dev_err(&client->dev, "Failed to allocate device name\n");
 690                 return -ENOMEM;
 691         }
 692
 693         chip = kzalloc(sizeof(struct sbs_info), GFP_KERNEL);
 694         if (!chip) {
 695                 rc = -ENOMEM;
 696                 goto exit_free_name;
 697         }
 698
 699         chip->client = client;
 700         chip->enable_detection = false;
 701         chip->gpio_detect = false;
 702         chip->power_supply.name = name;
 703         chip->power_supply.type = POWER_SUPPLY_TYPE_BATTERY;
 704         chip->power_supply.properties = sbs_properties;
 705         chip->power_supply.num_properties = ARRAY_SIZE(sbs_properties);
 706         chip->power_supply.get_property = sbs_get_property;
 707         chip->power_supply.of_node = client->dev.of_node;
 708         /* ignore first notification of external change, it is generated
 709          * from the power_supply_register call back
 710          */
 711         chip->ignore_changes = 1;
 712         chip->last_state = POWER_SUPPLY_STATUS_UNKNOWN;
 713         chip->power_supply.external_power_changed = sbs_external_power_changed;
 714
 715         pdata = sbs_of_populate_pdata(client);
 716
 717         if (pdata) {
 718                 chip->gpio_detect = gpio_is_valid(pdata->battery_detect);
 719                 chip->pdata = pdata;
 720         }
 721
 722         i2c_set_clientdata(client, chip);
 723
 724         if (!chip->gpio_detect)
 725                 goto skip_gpio;
 726
 727         rc = gpio_request(pdata->battery_detect, dev_name(&client->dev));
 728         if (rc) {
 729                 dev_warn(&client->dev, "Failed to request gpio: %d\n", rc);
 730                 chip->gpio_detect = false;
 731                 goto skip_gpio;
 732         }
 733
 734         rc = gpio_direction_input(pdata->battery_detect);
 735         if (rc) {
 736                 dev_warn(&client->dev, "Failed to get gpio as input: %d\n", rc);
 737                 gpio_free(pdata->battery_detect);
 738                 chip->gpio_detect = false;
 739                 goto skip_gpio;
 740         }
 741
 742         irq = gpio_to_irq(pdata->battery_detect);
 743         if (irq <= 0) {
 744                 dev_warn(&client->dev, "Failed to get gpio as irq: %d\n", irq);
 745                 gpio_free(pdata->battery_detect);
 746                 chip->gpio_detect = false;
 747                 goto skip_gpio;
 748         }
 749
 750         rc = request_irq(irq, sbs_irq,
 751                 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
 752                 dev_name(&client->dev), &chip->power_supply);
 753         if (rc) {
 754                 dev_warn(&client->dev, "Failed to request irq: %d\n", rc);
 755                 gpio_free(pdata->battery_detect);
 756                 chip->gpio_detect = false;
 757                 goto skip_gpio;
 758         }
 759
 760         chip->irq = irq;
 761
 762 skip_gpio:
 763         /*
 764          * Before we register, we need to make sure we can actually talk
 765          * to the battery.
 766          */
 767         rc = sbs_read_word_data(client, sbs_data[REG_STATUS].addr);
 768         if (rc < 0) {
 769                 dev_err(&client->dev, "%s: Failed to get device status\n",
 770                         __func__);
 771                 goto exit_psupply;
 772         }
 773
 774         rc = power_supply_register(&client->dev, &chip->power_supply);
 775         if (rc) {
 776                 dev_err(&client->dev,
 777                         "%s: Failed to register power supply\n", __func__);
 778                 goto exit_psupply;
 779         }
 780
 781         dev_info(&client->dev,
 782                 "%s: battery gas gauge device registered\n", client->name);
 783
 784         INIT_DELAYED_WORK(&chip->work, sbs_delayed_work);
 785
 786         chip->enable_detection = true;
 787
 788         return 0;
 789
 790 exit_psupply:
 791         if (chip->irq)
 792                 free_irq(chip->irq, &chip->power_supply);
 793         if (chip->gpio_detect)
 794                 gpio_free(pdata->battery_detect);
 795
 796         kfree(chip);
 797
 798 exit_free_name:
 799         kfree(name);
 800
 801         return rc;
 802 }
 803
 804 static int sbs_remove(struct i2c_client *client)
 805 {
 806         struct sbs_info *chip = i2c_get_clientdata(client);
 807
 808         if (chip->irq)
 809                 free_irq(chip->irq, &chip->power_supply);
 810         if (chip->gpio_detect)
 811                 gpio_free(chip->pdata->battery_detect);
 812
 813         power_supply_unregister(&chip->power_supply);
 814
 815         cancel_delayed_work_sync(&chip->work);
 816
 817         kfree(chip->power_supply.name);
 818         kfree(chip);
 819         chip = NULL;
 820
 821         return 0;
 822 }
 823
 824 #if defined CONFIG_PM_SLEEP
 825
 826 static int sbs_suspend(struct device *dev)
 827 {
 828         struct i2c_client *client = to_i2c_client(dev);
 829         struct sbs_info *chip = i2c_get_clientdata(client);
 830         s32 ret;
 831
 832         if (chip->poll_time > 0)
 833                 cancel_delayed_work_sync(&chip->work);
 834
 835         /* write to manufacturer access with sleep command */
 836         ret = sbs_write_word_data(client, sbs_data[REG_MANUFACTURER_DATA].addr,
 837                 MANUFACTURER_ACCESS_SLEEP);
 838         if (chip->is_present && ret < 0)
 839                 return ret;
 840
 841         return 0;
 842 }
 843
 844 static SIMPLE_DEV_PM_OPS(sbs_pm_ops, sbs_suspend, NULL);
 845 #define SBS_PM_OPS (&sbs_pm_ops)
 846
 847 #else
 848 #define SBS_PM_OPS NULL
 849 #endif
 850
 851 static const struct i2c_device_id sbs_id[] = {
 852         { "bq20z75", 0 },
 853         { "sbs-battery", 1 },
 854         {}
 855 };
 856 MODULE_DEVICE_TABLE(i2c, sbs_id);
 857
 858 static struct i2c_driver sbs_battery_driver = {
 859         .probe          = sbs_probe,
 860         .remove         = sbs_remove,
 861         .id_table       = sbs_id,
 862         .driver = {
 863                 .name   = "sbs-battery",
 864                 .of_match_table = of_match_ptr(sbs_dt_ids),
 865                 .pm     = SBS_PM_OPS,
 866         },
 867 };
 868 module_i2c_driver(sbs_battery_driver);
 869
 870 MODULE_DESCRIPTION("SBS battery monitor driver");
 871 MODULE_LICENSE("GPL");