drivers/power/bq2415x_charger.c

   1 /*
   2  * bq2415x charger driver
   3  *
   4  * Copyright (C) 2011-2013  Pali Rohár <pali.rohar@gmail.com>
   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,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * Datasheets:
  17  * http://www.ti.com/product/bq24150
  18  * http://www.ti.com/product/bq24150a
  19  * http://www.ti.com/product/bq24152
  20  * http://www.ti.com/product/bq24153
  21  * http://www.ti.com/product/bq24153a
  22  * http://www.ti.com/product/bq24155
  23  * http://www.ti.com/product/bq24157s
  24  * http://www.ti.com/product/bq24158
  25  */
  26
  27 #include <linux/kernel.h>
  28 #include <linux/module.h>
  29 #include <linux/param.h>
  30 #include <linux/err.h>
  31 #include <linux/workqueue.h>
  32 #include <linux/sysfs.h>
  33 #include <linux/platform_device.h>
  34 #include <linux/power_supply.h>
  35 #include <linux/idr.h>
  36 #include <linux/i2c.h>
  37 #include <linux/slab.h>
  38 #include <linux/acpi.h>
  39
  40 #include <linux/power/bq2415x_charger.h>
  41
  42 /* timeout for resetting chip timer */
  43 #define BQ2415X_TIMER_TIMEOUT           10
  44
  45 #define BQ2415X_REG_STATUS              0x00
  46 #define BQ2415X_REG_CONTROL             0x01
  47 #define BQ2415X_REG_VOLTAGE             0x02
  48 #define BQ2415X_REG_VENDER              0x03
  49 #define BQ2415X_REG_CURRENT             0x04
  50
  51 /* reset state for all registers */
  52 #define BQ2415X_RESET_STATUS            BIT(6)
  53 #define BQ2415X_RESET_CONTROL           (BIT(4)|BIT(5))
  54 #define BQ2415X_RESET_VOLTAGE           (BIT(1)|BIT(3))
  55 #define BQ2415X_RESET_CURRENT           (BIT(0)|BIT(3)|BIT(7))
  56
  57 /* status register */
  58 #define BQ2415X_BIT_TMR_RST             7
  59 #define BQ2415X_BIT_OTG                 7
  60 #define BQ2415X_BIT_EN_STAT             6
  61 #define BQ2415X_MASK_STAT               (BIT(4)|BIT(5))
  62 #define BQ2415X_SHIFT_STAT              4
  63 #define BQ2415X_BIT_BOOST               3
  64 #define BQ2415X_MASK_FAULT              (BIT(0)|BIT(1)|BIT(2))
  65 #define BQ2415X_SHIFT_FAULT             0
  66
  67 /* control register */
  68 #define BQ2415X_MASK_LIMIT              (BIT(6)|BIT(7))
  69 #define BQ2415X_SHIFT_LIMIT             6
  70 #define BQ2415X_MASK_VLOWV              (BIT(4)|BIT(5))
  71 #define BQ2415X_SHIFT_VLOWV             4
  72 #define BQ2415X_BIT_TE                  3
  73 #define BQ2415X_BIT_CE                  2
  74 #define BQ2415X_BIT_HZ_MODE             1
  75 #define BQ2415X_BIT_OPA_MODE            0
  76
  77 /* voltage register */
  78 #define BQ2415X_MASK_VO         (BIT(2)|BIT(3)|BIT(4)|BIT(5)|BIT(6)|BIT(7))
  79 #define BQ2415X_SHIFT_VO                2
  80 #define BQ2415X_BIT_OTG_PL              1
  81 #define BQ2415X_BIT_OTG_EN              0
  82
  83 /* vender register */
  84 #define BQ2415X_MASK_VENDER             (BIT(5)|BIT(6)|BIT(7))
  85 #define BQ2415X_SHIFT_VENDER            5
  86 #define BQ2415X_MASK_PN                 (BIT(3)|BIT(4))
  87 #define BQ2415X_SHIFT_PN                3
  88 #define BQ2415X_MASK_REVISION           (BIT(0)|BIT(1)|BIT(2))
  89 #define BQ2415X_SHIFT_REVISION          0
  90
  91 /* current register */
  92 #define BQ2415X_MASK_RESET              BIT(7)
  93 #define BQ2415X_MASK_VI_CHRG            (BIT(4)|BIT(5)|BIT(6))
  94 #define BQ2415X_SHIFT_VI_CHRG           4
  95 /* N/A                                  BIT(3) */
  96 #define BQ2415X_MASK_VI_TERM            (BIT(0)|BIT(1)|BIT(2))
  97 #define BQ2415X_SHIFT_VI_TERM           0
  98
  99
 100 enum bq2415x_command {
 101         BQ2415X_TIMER_RESET,
 102         BQ2415X_OTG_STATUS,
 103         BQ2415X_STAT_PIN_STATUS,
 104         BQ2415X_STAT_PIN_ENABLE,
 105         BQ2415X_STAT_PIN_DISABLE,
 106         BQ2415X_CHARGE_STATUS,
 107         BQ2415X_BOOST_STATUS,
 108         BQ2415X_FAULT_STATUS,
 109
 110         BQ2415X_CHARGE_TERMINATION_STATUS,
 111         BQ2415X_CHARGE_TERMINATION_ENABLE,
 112         BQ2415X_CHARGE_TERMINATION_DISABLE,
 113         BQ2415X_CHARGER_STATUS,
 114         BQ2415X_CHARGER_ENABLE,
 115         BQ2415X_CHARGER_DISABLE,
 116         BQ2415X_HIGH_IMPEDANCE_STATUS,
 117         BQ2415X_HIGH_IMPEDANCE_ENABLE,
 118         BQ2415X_HIGH_IMPEDANCE_DISABLE,
 119         BQ2415X_BOOST_MODE_STATUS,
 120         BQ2415X_BOOST_MODE_ENABLE,
 121         BQ2415X_BOOST_MODE_DISABLE,
 122
 123         BQ2415X_OTG_LEVEL,
 124         BQ2415X_OTG_ACTIVATE_HIGH,
 125         BQ2415X_OTG_ACTIVATE_LOW,
 126         BQ2415X_OTG_PIN_STATUS,
 127         BQ2415X_OTG_PIN_ENABLE,
 128         BQ2415X_OTG_PIN_DISABLE,
 129
 130         BQ2415X_VENDER_CODE,
 131         BQ2415X_PART_NUMBER,
 132         BQ2415X_REVISION,
 133 };
 134
 135 enum bq2415x_chip {
 136         BQUNKNOWN,
 137         BQ24150,
 138         BQ24150A,
 139         BQ24151,
 140         BQ24151A,
 141         BQ24152,
 142         BQ24153,
 143         BQ24153A,
 144         BQ24155,
 145         BQ24156,
 146         BQ24156A,
 147         BQ24157S,
 148         BQ24158,
 149 };
 150
 151 static char *bq2415x_chip_name[] = {
 152         "unknown",
 153         "bq24150",
 154         "bq24150a",
 155         "bq24151",
 156         "bq24151a",
 157         "bq24152",
 158         "bq24153",
 159         "bq24153a",
 160         "bq24155",
 161         "bq24156",
 162         "bq24156a",
 163         "bq24157s",
 164         "bq24158",
 165 };
 166
 167 struct bq2415x_device {
 168         struct device *dev;
 169         struct bq2415x_platform_data init_data;
 170         struct power_supply *charger;
 171         struct power_supply_desc charger_desc;
 172         struct delayed_work work;
 173         struct device_node *notify_node;
 174         struct notifier_block nb;
 175         enum bq2415x_mode reported_mode;/* mode reported by hook function */
 176         enum bq2415x_mode mode;         /* currently configured mode */
 177         enum bq2415x_chip chip;
 178         const char *timer_error;
 179         char *model;
 180         char *name;
 181         int autotimer;  /* 1 - if driver automatically reset timer, 0 - not */
 182         int automode;   /* 1 - enabled, 0 - disabled; -1 - not supported */
 183         int id;
 184 };
 185
 186 /* each registered chip must have unique id */
 187 static DEFINE_IDR(bq2415x_id);
 188
 189 static DEFINE_MUTEX(bq2415x_id_mutex);
 190 static DEFINE_MUTEX(bq2415x_timer_mutex);
 191 static DEFINE_MUTEX(bq2415x_i2c_mutex);
 192
 193 /**** i2c read functions ****/
 194
 195 /* read value from register */
 196 static int bq2415x_i2c_read(struct bq2415x_device *bq, u8 reg)
 197 {
 198         struct i2c_client *client = to_i2c_client(bq->dev);
 199         struct i2c_msg msg[2];
 200         u8 val;
 201         int ret;
 202
 203         if (!client->adapter)
 204                 return -ENODEV;
 205
 206         msg[0].addr = client->addr;
 207         msg[0].flags = 0;
 208         msg[0].buf = &reg;
 209         msg[0].len = sizeof(reg);
 210         msg[1].addr = client->addr;
 211         msg[1].flags = I2C_M_RD;
 212         msg[1].buf = &val;
 213         msg[1].len = sizeof(val);
 214
 215         mutex_lock(&bq2415x_i2c_mutex);
 216         ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
 217         mutex_unlock(&bq2415x_i2c_mutex);
 218
 219         if (ret < 0)
 220                 return ret;
 221
 222         return val;
 223 }
 224
 225 /* read value from register, apply mask and right shift it */
 226 static int bq2415x_i2c_read_mask(struct bq2415x_device *bq, u8 reg,
 227                                  u8 mask, u8 shift)
 228 {
 229         int ret;
 230
 231         if (shift > 8)
 232                 return -EINVAL;
 233
 234         ret = bq2415x_i2c_read(bq, reg);
 235         if (ret < 0)
 236                 return ret;
 237         return (ret & mask) >> shift;
 238 }
 239
 240 /* read value from register and return one specified bit */
 241 static int bq2415x_i2c_read_bit(struct bq2415x_device *bq, u8 reg, u8 bit)
 242 {
 243         if (bit > 8)
 244                 return -EINVAL;
 245         return bq2415x_i2c_read_mask(bq, reg, BIT(bit), bit);
 246 }
 247
 248 /**** i2c write functions ****/
 249
 250 /* write value to register */
 251 static int bq2415x_i2c_write(struct bq2415x_device *bq, u8 reg, u8 val)
 252 {
 253         struct i2c_client *client = to_i2c_client(bq->dev);
 254         struct i2c_msg msg[1];
 255         u8 data[2];
 256         int ret;
 257
 258         data[0] = reg;
 259         data[1] = val;
 260
 261         msg[0].addr = client->addr;
 262         msg[0].flags = 0;
 263         msg[0].buf = data;
 264         msg[0].len = ARRAY_SIZE(data);
 265
 266         mutex_lock(&bq2415x_i2c_mutex);
 267         ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
 268         mutex_unlock(&bq2415x_i2c_mutex);
 269
 270         /* i2c_transfer returns number of messages transferred */
 271         if (ret < 0)
 272                 return ret;
 273         else if (ret != 1)
 274                 return -EIO;
 275
 276         return 0;
 277 }
 278
 279 /* read value from register, change it with mask left shifted and write back */
 280 static int bq2415x_i2c_write_mask(struct bq2415x_device *bq, u8 reg, u8 val,
 281                                   u8 mask, u8 shift)
 282 {
 283         int ret;
 284
 285         if (shift > 8)
 286                 return -EINVAL;
 287
 288         ret = bq2415x_i2c_read(bq, reg);
 289         if (ret < 0)
 290                 return ret;
 291
 292         ret &= ~mask;
 293         ret |= val << shift;
 294
 295         return bq2415x_i2c_write(bq, reg, ret);
 296 }
 297
 298 /* change only one bit in register */
 299 static int bq2415x_i2c_write_bit(struct bq2415x_device *bq, u8 reg,
 300                                  bool val, u8 bit)
 301 {
 302         if (bit > 8)
 303                 return -EINVAL;
 304         return bq2415x_i2c_write_mask(bq, reg, val, BIT(bit), bit);
 305 }
 306
 307 /**** global functions ****/
 308
 309 /* exec command function */
 310 static int bq2415x_exec_command(struct bq2415x_device *bq,
 311                                 enum bq2415x_command command)
 312 {
 313         int ret;
 314
 315         switch (command) {
 316         case BQ2415X_TIMER_RESET:
 317                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_STATUS,
 318                                 1, BQ2415X_BIT_TMR_RST);
 319         case BQ2415X_OTG_STATUS:
 320                 return bq2415x_i2c_read_bit(bq, BQ2415X_REG_STATUS,
 321                                 BQ2415X_BIT_OTG);
 322         case BQ2415X_STAT_PIN_STATUS:
 323                 return bq2415x_i2c_read_bit(bq, BQ2415X_REG_STATUS,
 324                                 BQ2415X_BIT_EN_STAT);
 325         case BQ2415X_STAT_PIN_ENABLE:
 326                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_STATUS, 1,
 327                                 BQ2415X_BIT_EN_STAT);
 328         case BQ2415X_STAT_PIN_DISABLE:
 329                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_STATUS, 0,
 330                                 BQ2415X_BIT_EN_STAT);
 331         case BQ2415X_CHARGE_STATUS:
 332                 return bq2415x_i2c_read_mask(bq, BQ2415X_REG_STATUS,
 333                                 BQ2415X_MASK_STAT, BQ2415X_SHIFT_STAT);
 334         case BQ2415X_BOOST_STATUS:
 335                 return bq2415x_i2c_read_bit(bq, BQ2415X_REG_STATUS,
 336                                 BQ2415X_BIT_BOOST);
 337         case BQ2415X_FAULT_STATUS:
 338                 return bq2415x_i2c_read_mask(bq, BQ2415X_REG_STATUS,
 339                         BQ2415X_MASK_FAULT, BQ2415X_SHIFT_FAULT);
 340
 341         case BQ2415X_CHARGE_TERMINATION_STATUS:
 342                 return bq2415x_i2c_read_bit(bq, BQ2415X_REG_CONTROL,
 343                                 BQ2415X_BIT_TE);
 344         case BQ2415X_CHARGE_TERMINATION_ENABLE:
 345                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
 346                                 1, BQ2415X_BIT_TE);
 347         case BQ2415X_CHARGE_TERMINATION_DISABLE:
 348                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
 349                                 0, BQ2415X_BIT_TE);
 350         case BQ2415X_CHARGER_STATUS:
 351                 ret = bq2415x_i2c_read_bit(bq, BQ2415X_REG_CONTROL,
 352                         BQ2415X_BIT_CE);
 353                 if (ret < 0)
 354                         return ret;
 355                 return ret > 0 ? 0 : 1;
 356         case BQ2415X_CHARGER_ENABLE:
 357                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
 358                                 0, BQ2415X_BIT_CE);
 359         case BQ2415X_CHARGER_DISABLE:
 360                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
 361                                 1, BQ2415X_BIT_CE);
 362         case BQ2415X_HIGH_IMPEDANCE_STATUS:
 363                 return bq2415x_i2c_read_bit(bq, BQ2415X_REG_CONTROL,
 364                                 BQ2415X_BIT_HZ_MODE);
 365         case BQ2415X_HIGH_IMPEDANCE_ENABLE:
 366                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
 367                                 1, BQ2415X_BIT_HZ_MODE);
 368         case BQ2415X_HIGH_IMPEDANCE_DISABLE:
 369                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
 370                                 0, BQ2415X_BIT_HZ_MODE);
 371         case BQ2415X_BOOST_MODE_STATUS:
 372                 return bq2415x_i2c_read_bit(bq, BQ2415X_REG_CONTROL,
 373                                 BQ2415X_BIT_OPA_MODE);
 374         case BQ2415X_BOOST_MODE_ENABLE:
 375                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
 376                                 1, BQ2415X_BIT_OPA_MODE);
 377         case BQ2415X_BOOST_MODE_DISABLE:
 378                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
 379                                 0, BQ2415X_BIT_OPA_MODE);
 380
 381         case BQ2415X_OTG_LEVEL:
 382                 return bq2415x_i2c_read_bit(bq, BQ2415X_REG_VOLTAGE,
 383                                 BQ2415X_BIT_OTG_PL);
 384         case BQ2415X_OTG_ACTIVATE_HIGH:
 385                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_VOLTAGE,
 386                                 1, BQ2415X_BIT_OTG_PL);
 387         case BQ2415X_OTG_ACTIVATE_LOW:
 388                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_VOLTAGE,
 389                                 0, BQ2415X_BIT_OTG_PL);
 390         case BQ2415X_OTG_PIN_STATUS:
 391                 return bq2415x_i2c_read_bit(bq, BQ2415X_REG_VOLTAGE,
 392                                 BQ2415X_BIT_OTG_EN);
 393         case BQ2415X_OTG_PIN_ENABLE:
 394                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_VOLTAGE,
 395                                 1, BQ2415X_BIT_OTG_EN);
 396         case BQ2415X_OTG_PIN_DISABLE:
 397                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_VOLTAGE,
 398                                 0, BQ2415X_BIT_OTG_EN);
 399
 400         case BQ2415X_VENDER_CODE:
 401                 return bq2415x_i2c_read_mask(bq, BQ2415X_REG_VENDER,
 402                         BQ2415X_MASK_VENDER, BQ2415X_SHIFT_VENDER);
 403         case BQ2415X_PART_NUMBER:
 404                 return bq2415x_i2c_read_mask(bq, BQ2415X_REG_VENDER,
 405                                 BQ2415X_MASK_PN, BQ2415X_SHIFT_PN);
 406         case BQ2415X_REVISION:
 407                 return bq2415x_i2c_read_mask(bq, BQ2415X_REG_VENDER,
 408                         BQ2415X_MASK_REVISION, BQ2415X_SHIFT_REVISION);
 409         }
 410         return -EINVAL;
 411 }
 412
 413 /* detect chip type */
 414 static enum bq2415x_chip bq2415x_detect_chip(struct bq2415x_device *bq)
 415 {
 416         struct i2c_client *client = to_i2c_client(bq->dev);
 417         int ret = bq2415x_exec_command(bq, BQ2415X_PART_NUMBER);
 418
 419         if (ret < 0)
 420                 return ret;
 421
 422         switch (client->addr) {
 423         case 0x6b:
 424                 switch (ret) {
 425                 case 0:
 426                         if (bq->chip == BQ24151A)
 427                                 return bq->chip;
 428                         return BQ24151;
 429                 case 1:
 430                         if (bq->chip == BQ24150A ||
 431                                 bq->chip == BQ24152 ||
 432                                 bq->chip == BQ24155)
 433                                 return bq->chip;
 434                         return BQ24150;
 435                 case 2:
 436                         if (bq->chip == BQ24153A)
 437                                 return bq->chip;
 438                         return BQ24153;
 439                 default:
 440                         return BQUNKNOWN;
 441                 }
 442                 break;
 443
 444         case 0x6a:
 445                 switch (ret) {
 446                 case 0:
 447                         if (bq->chip == BQ24156A)
 448                                 return bq->chip;
 449                         return BQ24156;
 450                 case 2:
 451                         if (bq->chip == BQ24157S)
 452                                 return bq->chip;
 453                         return BQ24158;
 454                 default:
 455                         return BQUNKNOWN;
 456                 }
 457                 break;
 458         }
 459
 460         return BQUNKNOWN;
 461 }
 462
 463 /* detect chip revision */
 464 static int bq2415x_detect_revision(struct bq2415x_device *bq)
 465 {
 466         int ret = bq2415x_exec_command(bq, BQ2415X_REVISION);
 467         int chip = bq2415x_detect_chip(bq);
 468
 469         if (ret < 0 || chip < 0)
 470                 return -1;
 471
 472         switch (chip) {
 473         case BQ24150:
 474         case BQ24150A:
 475         case BQ24151:
 476         case BQ24151A:
 477         case BQ24152:
 478                 if (ret >= 0 && ret <= 3)
 479                         return ret;
 480                 return -1;
 481         case BQ24153:
 482         case BQ24153A:
 483         case BQ24156:
 484         case BQ24156A:
 485         case BQ24157S:
 486         case BQ24158:
 487                 if (ret == 3)
 488                         return 0;
 489                 else if (ret == 1)
 490                         return 1;
 491                 return -1;
 492         case BQ24155:
 493                 if (ret == 3)
 494                         return 3;
 495                 return -1;
 496         case BQUNKNOWN:
 497                 return -1;
 498         }
 499
 500         return -1;
 501 }
 502
 503 /* return chip vender code */
 504 static int bq2415x_get_vender_code(struct bq2415x_device *bq)
 505 {
 506         int ret;
 507
 508         ret = bq2415x_exec_command(bq, BQ2415X_VENDER_CODE);
 509         if (ret < 0)
 510                 return 0;
 511
 512         /* convert to binary */
 513         return (ret & 0x1) +
 514                ((ret >> 1) & 0x1) * 10 +
 515                ((ret >> 2) & 0x1) * 100;
 516 }
 517
 518 /* reset all chip registers to default state */
 519 static void bq2415x_reset_chip(struct bq2415x_device *bq)
 520 {
 521         bq2415x_i2c_write(bq, BQ2415X_REG_CURRENT, BQ2415X_RESET_CURRENT);
 522         bq2415x_i2c_write(bq, BQ2415X_REG_VOLTAGE, BQ2415X_RESET_VOLTAGE);
 523         bq2415x_i2c_write(bq, BQ2415X_REG_CONTROL, BQ2415X_RESET_CONTROL);
 524         bq2415x_i2c_write(bq, BQ2415X_REG_STATUS, BQ2415X_RESET_STATUS);
 525         bq->timer_error = NULL;
 526 }
 527
 528 /**** properties functions ****/
 529
 530 /* set current limit in mA */
 531 static int bq2415x_set_current_limit(struct bq2415x_device *bq, int mA)
 532 {
 533         int val;
 534
 535         if (mA <= 100)
 536                 val = 0;
 537         else if (mA <= 500)
 538                 val = 1;
 539         else if (mA <= 800)
 540                 val = 2;
 541         else
 542                 val = 3;
 543
 544         return bq2415x_i2c_write_mask(bq, BQ2415X_REG_CONTROL, val,
 545                         BQ2415X_MASK_LIMIT, BQ2415X_SHIFT_LIMIT);
 546 }
 547
 548 /* get current limit in mA */
 549 static int bq2415x_get_current_limit(struct bq2415x_device *bq)
 550 {
 551         int ret;
 552
 553         ret = bq2415x_i2c_read_mask(bq, BQ2415X_REG_CONTROL,
 554                         BQ2415X_MASK_LIMIT, BQ2415X_SHIFT_LIMIT);
 555         if (ret < 0)
 556                 return ret;
 557         else if (ret == 0)
 558                 return 100;
 559         else if (ret == 1)
 560                 return 500;
 561         else if (ret == 2)
 562                 return 800;
 563         else if (ret == 3)
 564                 return 1800;
 565         return -EINVAL;
 566 }
 567
 568 /* set weak battery voltage in mV */
 569 static int bq2415x_set_weak_battery_voltage(struct bq2415x_device *bq, int mV)
 570 {
 571         int val;
 572
 573         /* round to 100mV */
 574         if (mV <= 3400 + 50)
 575                 val = 0;
 576         else if (mV <= 3500 + 50)
 577                 val = 1;
 578         else if (mV <= 3600 + 50)
 579                 val = 2;
 580         else
 581                 val = 3;
 582
 583         return bq2415x_i2c_write_mask(bq, BQ2415X_REG_CONTROL, val,
 584                         BQ2415X_MASK_VLOWV, BQ2415X_SHIFT_VLOWV);
 585 }
 586
 587 /* get weak battery voltage in mV */
 588 static int bq2415x_get_weak_battery_voltage(struct bq2415x_device *bq)
 589 {
 590         int ret;
 591
 592         ret = bq2415x_i2c_read_mask(bq, BQ2415X_REG_CONTROL,
 593                         BQ2415X_MASK_VLOWV, BQ2415X_SHIFT_VLOWV);
 594         if (ret < 0)
 595                 return ret;
 596         return 100 * (34 + ret);
 597 }
 598
 599 /* set battery regulation voltage in mV */
 600 static int bq2415x_set_battery_regulation_voltage(struct bq2415x_device *bq,
 601                                                   int mV)
 602 {
 603         int val = (mV/10 - 350) / 2;
 604
 605         /*
 606          * According to datasheet, maximum battery regulation voltage is
 607          * 4440mV which is b101111 = 47.
 608          */
 609         if (val < 0)
 610                 val = 0;
 611         else if (val > 47)
 612                 return -EINVAL;
 613
 614         return bq2415x_i2c_write_mask(bq, BQ2415X_REG_VOLTAGE, val,
 615                         BQ2415X_MASK_VO, BQ2415X_SHIFT_VO);
 616 }
 617
 618 /* get battery regulation voltage in mV */
 619 static int bq2415x_get_battery_regulation_voltage(struct bq2415x_device *bq)
 620 {
 621         int ret = bq2415x_i2c_read_mask(bq, BQ2415X_REG_VOLTAGE,
 622                         BQ2415X_MASK_VO, BQ2415X_SHIFT_VO);
 623
 624         if (ret < 0)
 625                 return ret;
 626         return 10 * (350 + 2*ret);
 627 }
 628
 629 /* set charge current in mA (platform data must provide resistor sense) */
 630 static int bq2415x_set_charge_current(struct bq2415x_device *bq, int mA)
 631 {
 632         int val;
 633
 634         if (bq->init_data.resistor_sense <= 0)
 635                 return -EINVAL;
 636
 637         val = (mA * bq->init_data.resistor_sense - 37400) / 6800;
 638         if (val < 0)
 639                 val = 0;
 640         else if (val > 7)
 641                 val = 7;
 642
 643         return bq2415x_i2c_write_mask(bq, BQ2415X_REG_CURRENT, val,
 644                         BQ2415X_MASK_VI_CHRG | BQ2415X_MASK_RESET,
 645                         BQ2415X_SHIFT_VI_CHRG);
 646 }
 647
 648 /* get charge current in mA (platform data must provide resistor sense) */
 649 static int bq2415x_get_charge_current(struct bq2415x_device *bq)
 650 {
 651         int ret;
 652
 653         if (bq->init_data.resistor_sense <= 0)
 654                 return -EINVAL;
 655
 656         ret = bq2415x_i2c_read_mask(bq, BQ2415X_REG_CURRENT,
 657                         BQ2415X_MASK_VI_CHRG, BQ2415X_SHIFT_VI_CHRG);
 658         if (ret < 0)
 659                 return ret;
 660         return (37400 + 6800*ret) / bq->init_data.resistor_sense;
 661 }
 662
 663 /* set termination current in mA (platform data must provide resistor sense) */
 664 static int bq2415x_set_termination_current(struct bq2415x_device *bq, int mA)
 665 {
 666         int val;
 667
 668         if (bq->init_data.resistor_sense <= 0)
 669                 return -EINVAL;
 670
 671         val = (mA * bq->init_data.resistor_sense - 3400) / 3400;
 672         if (val < 0)
 673                 val = 0;
 674         else if (val > 7)
 675                 val = 7;
 676
 677         return bq2415x_i2c_write_mask(bq, BQ2415X_REG_CURRENT, val,
 678                         BQ2415X_MASK_VI_TERM | BQ2415X_MASK_RESET,
 679                         BQ2415X_SHIFT_VI_TERM);
 680 }
 681
 682 /* get termination current in mA (platform data must provide resistor sense) */
 683 static int bq2415x_get_termination_current(struct bq2415x_device *bq)
 684 {
 685         int ret;
 686
 687         if (bq->init_data.resistor_sense <= 0)
 688                 return -EINVAL;
 689
 690         ret = bq2415x_i2c_read_mask(bq, BQ2415X_REG_CURRENT,
 691                         BQ2415X_MASK_VI_TERM, BQ2415X_SHIFT_VI_TERM);
 692         if (ret < 0)
 693                 return ret;
 694         return (3400 + 3400*ret) / bq->init_data.resistor_sense;
 695 }
 696
 697 /* set default value of property */
 698 #define bq2415x_set_default_value(bq, prop) \
 699         do { \
 700                 int ret = 0; \
 701                 if (bq->init_data.prop != -1) \
 702                         ret = bq2415x_set_##prop(bq, bq->init_data.prop); \
 703                 if (ret < 0) \
 704                         return ret; \
 705         } while (0)
 706
 707 /* set default values of all properties */
 708 static int bq2415x_set_defaults(struct bq2415x_device *bq)
 709 {
 710         bq2415x_exec_command(bq, BQ2415X_BOOST_MODE_DISABLE);
 711         bq2415x_exec_command(bq, BQ2415X_CHARGER_DISABLE);
 712         bq2415x_exec_command(bq, BQ2415X_CHARGE_TERMINATION_DISABLE);
 713
 714         bq2415x_set_default_value(bq, current_limit);
 715         bq2415x_set_default_value(bq, weak_battery_voltage);
 716         bq2415x_set_default_value(bq, battery_regulation_voltage);
 717
 718         if (bq->init_data.resistor_sense > 0) {
 719                 bq2415x_set_default_value(bq, charge_current);
 720                 bq2415x_set_default_value(bq, termination_current);
 721                 bq2415x_exec_command(bq, BQ2415X_CHARGE_TERMINATION_ENABLE);
 722         }
 723
 724         bq2415x_exec_command(bq, BQ2415X_CHARGER_ENABLE);
 725         return 0;
 726 }
 727
 728 /**** charger mode functions ****/
 729
 730 /* set charger mode */
 731 static int bq2415x_set_mode(struct bq2415x_device *bq, enum bq2415x_mode mode)
 732 {
 733         int ret = 0;
 734         int charger = 0;
 735         int boost = 0;
 736
 737         if (mode == BQ2415X_MODE_BOOST)
 738                 boost = 1;
 739         else if (mode != BQ2415X_MODE_OFF)
 740                 charger = 1;
 741
 742         if (!charger)
 743                 ret = bq2415x_exec_command(bq, BQ2415X_CHARGER_DISABLE);
 744
 745         if (!boost)
 746                 ret = bq2415x_exec_command(bq, BQ2415X_BOOST_MODE_DISABLE);
 747
 748         if (ret < 0)
 749                 return ret;
 750
 751         switch (mode) {
 752         case BQ2415X_MODE_OFF:
 753                 dev_dbg(bq->dev, "changing mode to: Offline\n");
 754                 ret = bq2415x_set_current_limit(bq, 100);
 755                 break;
 756         case BQ2415X_MODE_NONE:
 757                 dev_dbg(bq->dev, "changing mode to: N/A\n");
 758                 ret = bq2415x_set_current_limit(bq, 100);
 759                 break;
 760         case BQ2415X_MODE_HOST_CHARGER:
 761                 dev_dbg(bq->dev, "changing mode to: Host/HUB charger\n");
 762                 ret = bq2415x_set_current_limit(bq, 500);
 763                 break;
 764         case BQ2415X_MODE_DEDICATED_CHARGER:
 765                 dev_dbg(bq->dev, "changing mode to: Dedicated charger\n");
 766                 ret = bq2415x_set_current_limit(bq, 1800);
 767                 break;
 768         case BQ2415X_MODE_BOOST: /* Boost mode */
 769                 dev_dbg(bq->dev, "changing mode to: Boost\n");
 770                 ret = bq2415x_set_current_limit(bq, 100);
 771                 break;
 772         }
 773
 774         if (ret < 0)
 775                 return ret;
 776
 777         if (charger)
 778                 ret = bq2415x_exec_command(bq, BQ2415X_CHARGER_ENABLE);
 779         else if (boost)
 780                 ret = bq2415x_exec_command(bq, BQ2415X_BOOST_MODE_ENABLE);
 781
 782         if (ret < 0)
 783                 return ret;
 784
 785         bq2415x_set_default_value(bq, weak_battery_voltage);
 786         bq2415x_set_default_value(bq, battery_regulation_voltage);
 787
 788         bq->mode = mode;
 789         sysfs_notify(&bq->charger->dev.kobj, NULL, "mode");
 790
 791         return 0;
 792
 793 }
 794
 795 static bool bq2415x_update_reported_mode(struct bq2415x_device *bq, int mA)
 796 {
 797         enum bq2415x_mode mode;
 798
 799         if (mA == 0)
 800                 mode = BQ2415X_MODE_OFF;
 801         else if (mA < 500)
 802                 mode = BQ2415X_MODE_NONE;
 803         else if (mA < 1800)
 804                 mode = BQ2415X_MODE_HOST_CHARGER;
 805         else
 806                 mode = BQ2415X_MODE_DEDICATED_CHARGER;
 807
 808         if (bq->reported_mode == mode)
 809                 return false;
 810
 811         bq->reported_mode = mode;
 812         return true;
 813 }
 814
 815 static int bq2415x_notifier_call(struct notifier_block *nb,
 816                 unsigned long val, void *v)
 817 {
 818         struct bq2415x_device *bq =
 819                 container_of(nb, struct bq2415x_device, nb);
 820         struct power_supply *psy = v;
 821         union power_supply_propval prop;
 822         int ret;
 823
 824         if (val != PSY_EVENT_PROP_CHANGED)
 825                 return NOTIFY_OK;
 826
 827         /* Ignore event if it was not send by notify_node/notify_device */
 828         if (bq->notify_node) {
 829                 if (!psy->dev.parent ||
 830                     psy->dev.parent->of_node != bq->notify_node)
 831                         return NOTIFY_OK;
 832         } else if (bq->init_data.notify_device) {
 833                 if (strcmp(psy->desc->name, bq->init_data.notify_device) != 0)
 834                         return NOTIFY_OK;
 835         }
 836
 837         dev_dbg(bq->dev, "notifier call was called\n");
 838
 839         ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_CURRENT_MAX,
 840                         &prop);
 841         if (ret != 0)
 842                 return NOTIFY_OK;
 843
 844         if (!bq2415x_update_reported_mode(bq, prop.intval))
 845                 return NOTIFY_OK;
 846
 847         /* if automode is not enabled do not tell about reported_mode */
 848         if (bq->automode < 1)
 849                 return NOTIFY_OK;
 850
 851         schedule_delayed_work(&bq->work, 0);
 852
 853         return NOTIFY_OK;
 854 }
 855
 856 /**** timer functions ****/
 857
 858 /* enable/disable auto resetting chip timer */
 859 static void bq2415x_set_autotimer(struct bq2415x_device *bq, int state)
 860 {
 861         mutex_lock(&bq2415x_timer_mutex);
 862
 863         if (bq->autotimer == state) {
 864                 mutex_unlock(&bq2415x_timer_mutex);
 865                 return;
 866         }
 867
 868         bq->autotimer = state;
 869
 870         if (state) {
 871                 schedule_delayed_work(&bq->work, BQ2415X_TIMER_TIMEOUT * HZ);
 872                 bq2415x_exec_command(bq, BQ2415X_TIMER_RESET);
 873                 bq->timer_error = NULL;
 874         } else {
 875                 cancel_delayed_work_sync(&bq->work);
 876         }
 877
 878         mutex_unlock(&bq2415x_timer_mutex);
 879 }
 880
 881 /* called by bq2415x_timer_work on timer error */
 882 static void bq2415x_timer_error(struct bq2415x_device *bq, const char *msg)
 883 {
 884         bq->timer_error = msg;
 885         sysfs_notify(&bq->charger->dev.kobj, NULL, "timer");
 886         dev_err(bq->dev, "%s\n", msg);
 887         if (bq->automode > 0)
 888                 bq->automode = 0;
 889         bq2415x_set_mode(bq, BQ2415X_MODE_OFF);
 890         bq2415x_set_autotimer(bq, 0);
 891 }
 892
 893 /* delayed work function for auto resetting chip timer */
 894 static void bq2415x_timer_work(struct work_struct *work)
 895 {
 896         struct bq2415x_device *bq = container_of(work, struct bq2415x_device,
 897                                                  work.work);
 898         int ret;
 899         int error;
 900         int boost;
 901
 902         if (bq->automode > 0 && (bq->reported_mode != bq->mode)) {
 903                 sysfs_notify(&bq->charger->dev.kobj, NULL, "reported_mode");
 904                 bq2415x_set_mode(bq, bq->reported_mode);
 905         }
 906
 907         if (!bq->autotimer)
 908                 return;
 909
 910         ret = bq2415x_exec_command(bq, BQ2415X_TIMER_RESET);
 911         if (ret < 0) {
 912                 bq2415x_timer_error(bq, "Resetting timer failed");
 913                 return;
 914         }
 915
 916         boost = bq2415x_exec_command(bq, BQ2415X_BOOST_MODE_STATUS);
 917         if (boost < 0) {
 918                 bq2415x_timer_error(bq, "Unknown error");
 919                 return;
 920         }
 921
 922         error = bq2415x_exec_command(bq, BQ2415X_FAULT_STATUS);
 923         if (error < 0) {
 924                 bq2415x_timer_error(bq, "Unknown error");
 925                 return;
 926         }
 927
 928         if (boost) {
 929                 switch (error) {
 930                 /* Non fatal errors, chip is OK */
 931                 case 0: /* No error */
 932                         break;
 933                 case 6: /* Timer expired */
 934                         dev_err(bq->dev, "Timer expired\n");
 935                         break;
 936                 case 3: /* Battery voltage too low */
 937                         dev_err(bq->dev, "Battery voltage to low\n");
 938                         break;
 939
 940                 /* Fatal errors, disable and reset chip */
 941                 case 1: /* Overvoltage protection (chip fried) */
 942                         bq2415x_timer_error(bq,
 943                                 "Overvoltage protection (chip fried)");
 944                         return;
 945                 case 2: /* Overload */
 946                         bq2415x_timer_error(bq, "Overload");
 947                         return;
 948                 case 4: /* Battery overvoltage protection */
 949                         bq2415x_timer_error(bq,
 950                                 "Battery overvoltage protection");
 951                         return;
 952                 case 5: /* Thermal shutdown (too hot) */
 953                         bq2415x_timer_error(bq,
 954                                         "Thermal shutdown (too hot)");
 955                         return;
 956                 case 7: /* N/A */
 957                         bq2415x_timer_error(bq, "Unknown error");
 958                         return;
 959                 }
 960         } else {
 961                 switch (error) {
 962                 /* Non fatal errors, chip is OK */
 963                 case 0: /* No error */
 964                         break;
 965                 case 2: /* Sleep mode */
 966                         dev_err(bq->dev, "Sleep mode\n");
 967                         break;
 968                 case 3: /* Poor input source */
 969                         dev_err(bq->dev, "Poor input source\n");
 970                         break;
 971                 case 6: /* Timer expired */
 972                         dev_err(bq->dev, "Timer expired\n");
 973                         break;
 974                 case 7: /* No battery */
 975                         dev_err(bq->dev, "No battery\n");
 976                         break;
 977
 978                 /* Fatal errors, disable and reset chip */
 979                 case 1: /* Overvoltage protection (chip fried) */
 980                         bq2415x_timer_error(bq,
 981                                 "Overvoltage protection (chip fried)");
 982                         return;
 983                 case 4: /* Battery overvoltage protection */
 984                         bq2415x_timer_error(bq,
 985                                 "Battery overvoltage protection");
 986                         return;
 987                 case 5: /* Thermal shutdown (too hot) */
 988                         bq2415x_timer_error(bq,
 989                                 "Thermal shutdown (too hot)");
 990                         return;
 991                 }
 992         }
 993
 994         schedule_delayed_work(&bq->work, BQ2415X_TIMER_TIMEOUT * HZ);
 995 }
 996
 997 /**** power supply interface code ****/
 998
 999 static enum power_supply_property bq2415x_power_supply_props[] = {
1000         /* TODO: maybe add more power supply properties */
1001         POWER_SUPPLY_PROP_STATUS,
1002         POWER_SUPPLY_PROP_MODEL_NAME,
1003 };
1004
1005 static int bq2415x_power_supply_get_property(struct power_supply *psy,
1006                                              enum power_supply_property psp,
1007                                              union power_supply_propval *val)
1008 {
1009         struct bq2415x_device *bq = power_supply_get_drvdata(psy);
1010         int ret;
1011
1012         switch (psp) {
1013         case POWER_SUPPLY_PROP_STATUS:
1014                 ret = bq2415x_exec_command(bq, BQ2415X_CHARGE_STATUS);
1015                 if (ret < 0)
1016                         return ret;
1017                 else if (ret == 0) /* Ready */
1018                         val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
1019                 else if (ret == 1) /* Charge in progress */
1020                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
1021                 else if (ret == 2) /* Charge done */
1022                         val->intval = POWER_SUPPLY_STATUS_FULL;
1023                 else
1024                         val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
1025                 break;
1026         case POWER_SUPPLY_PROP_MODEL_NAME:
1027                 val->strval = bq->model;
1028                 break;
1029         default:
1030                 return -EINVAL;
1031         }
1032         return 0;
1033 }
1034
1035 static int bq2415x_power_supply_init(struct bq2415x_device *bq)
1036 {
1037         int ret;
1038         int chip;
1039         char revstr[8];
1040         struct power_supply_config psy_cfg = { .drv_data = bq, };
1041
1042         bq->charger_desc.name = bq->name;
1043         bq->charger_desc.type = POWER_SUPPLY_TYPE_USB;
1044         bq->charger_desc.properties = bq2415x_power_supply_props;
1045         bq->charger_desc.num_properties =
1046                         ARRAY_SIZE(bq2415x_power_supply_props);
1047         bq->charger_desc.get_property = bq2415x_power_supply_get_property;
1048
1049         ret = bq2415x_detect_chip(bq);
1050         if (ret < 0)
1051                 chip = BQUNKNOWN;
1052         else
1053                 chip = ret;
1054
1055         ret = bq2415x_detect_revision(bq);
1056         if (ret < 0)
1057                 strcpy(revstr, "unknown");
1058         else
1059                 sprintf(revstr, "1.%d", ret);
1060
1061         bq->model = kasprintf(GFP_KERNEL,
1062                                 "chip %s, revision %s, vender code %.3d",
1063                                 bq2415x_chip_name[chip], revstr,
1064                                 bq2415x_get_vender_code(bq));
1065         if (!bq->model) {
1066                 dev_err(bq->dev, "failed to allocate model name\n");
1067                 return -ENOMEM;
1068         }
1069
1070         bq->charger = power_supply_register(bq->dev, &bq->charger_desc,
1071                                             &psy_cfg);
1072         if (IS_ERR(bq->charger)) {
1073                 kfree(bq->model);
1074                 return PTR_ERR(bq->charger);
1075         }
1076
1077         return 0;
1078 }
1079
1080 static void bq2415x_power_supply_exit(struct bq2415x_device *bq)
1081 {
1082         bq->autotimer = 0;
1083         if (bq->automode > 0)
1084                 bq->automode = 0;
1085         cancel_delayed_work_sync(&bq->work);
1086         power_supply_unregister(bq->charger);
1087         kfree(bq->model);
1088 }
1089
1090 /**** additional sysfs entries for power supply interface ****/
1091
1092 /* show *_status entries */
1093 static ssize_t bq2415x_sysfs_show_status(struct device *dev,
1094                                          struct device_attribute *attr,
1095                                          char *buf)
1096 {
1097         struct power_supply *psy = dev_get_drvdata(dev);
1098         struct bq2415x_device *bq = power_supply_get_drvdata(psy);
1099         enum bq2415x_command command;
1100         int ret;
1101
1102         if (strcmp(attr->attr.name, "otg_status") == 0)
1103                 command = BQ2415X_OTG_STATUS;
1104         else if (strcmp(attr->attr.name, "charge_status") == 0)
1105                 command = BQ2415X_CHARGE_STATUS;
1106         else if (strcmp(attr->attr.name, "boost_status") == 0)
1107                 command = BQ2415X_BOOST_STATUS;
1108         else if (strcmp(attr->attr.name, "fault_status") == 0)
1109                 command = BQ2415X_FAULT_STATUS;
1110         else
1111                 return -EINVAL;
1112
1113         ret = bq2415x_exec_command(bq, command);
1114         if (ret < 0)
1115                 return ret;
1116         return sprintf(buf, "%d\n", ret);
1117 }
1118
1119 /*
1120  * set timer entry:
1121  *    auto - enable auto mode
1122  *    off - disable auto mode
1123  *    (other values) - reset chip timer
1124  */
1125 static ssize_t bq2415x_sysfs_set_timer(struct device *dev,
1126                                        struct device_attribute *attr,
1127                                        const char *buf,
1128                                        size_t count)
1129 {
1130         struct power_supply *psy = dev_get_drvdata(dev);
1131         struct bq2415x_device *bq = power_supply_get_drvdata(psy);
1132         int ret = 0;
1133
1134         if (strncmp(buf, "auto", 4) == 0)
1135                 bq2415x_set_autotimer(bq, 1);
1136         else if (strncmp(buf, "off", 3) == 0)
1137                 bq2415x_set_autotimer(bq, 0);
1138         else
1139                 ret = bq2415x_exec_command(bq, BQ2415X_TIMER_RESET);
1140
1141         if (ret < 0)
1142                 return ret;
1143         return count;
1144 }
1145
1146 /* show timer entry (auto or off) */
1147 static ssize_t bq2415x_sysfs_show_timer(struct device *dev,
1148                                         struct device_attribute *attr,
1149                                         char *buf)
1150 {
1151         struct power_supply *psy = dev_get_drvdata(dev);
1152         struct bq2415x_device *bq = power_supply_get_drvdata(psy);
1153
1154         if (bq->timer_error)
1155                 return sprintf(buf, "%s\n", bq->timer_error);
1156
1157         if (bq->autotimer)
1158                 return sprintf(buf, "auto\n");
1159         return sprintf(buf, "off\n");
1160 }
1161
1162 /*
1163  * set mode entry:
1164  *    auto - if automode is supported, enable it and set mode to reported
1165  *    none - disable charger and boost mode
1166  *    host - charging mode for host/hub chargers (current limit 500mA)
1167  *    dedicated - charging mode for dedicated chargers (unlimited current limit)
1168  *    boost - disable charger and enable boost mode
1169  */
1170 static ssize_t bq2415x_sysfs_set_mode(struct device *dev,
1171                                       struct device_attribute *attr,
1172                                       const char *buf,
1173                                       size_t count)
1174 {
1175         struct power_supply *psy = dev_get_drvdata(dev);
1176         struct bq2415x_device *bq = power_supply_get_drvdata(psy);
1177         enum bq2415x_mode mode;
1178         int ret = 0;
1179
1180         if (strncmp(buf, "auto", 4) == 0) {
1181                 if (bq->automode < 0)
1182                         return -EINVAL;
1183                 bq->automode = 1;
1184                 mode = bq->reported_mode;
1185         } else if (strncmp(buf, "off", 3) == 0) {
1186                 if (bq->automode > 0)
1187                         bq->automode = 0;
1188                 mode = BQ2415X_MODE_OFF;
1189         } else if (strncmp(buf, "none", 4) == 0) {
1190                 if (bq->automode > 0)
1191                         bq->automode = 0;
1192                 mode = BQ2415X_MODE_NONE;
1193         } else if (strncmp(buf, "host", 4) == 0) {
1194                 if (bq->automode > 0)
1195                         bq->automode = 0;
1196                 mode = BQ2415X_MODE_HOST_CHARGER;
1197         } else if (strncmp(buf, "dedicated", 9) == 0) {
1198                 if (bq->automode > 0)
1199                         bq->automode = 0;
1200                 mode = BQ2415X_MODE_DEDICATED_CHARGER;
1201         } else if (strncmp(buf, "boost", 5) == 0) {
1202                 if (bq->automode > 0)
1203                         bq->automode = 0;
1204                 mode = BQ2415X_MODE_BOOST;
1205         } else if (strncmp(buf, "reset", 5) == 0) {
1206                 bq2415x_reset_chip(bq);
1207                 bq2415x_set_defaults(bq);
1208                 if (bq->automode <= 0)
1209                         return count;
1210                 bq->automode = 1;
1211                 mode = bq->reported_mode;
1212         } else {
1213                 return -EINVAL;
1214         }
1215
1216         ret = bq2415x_set_mode(bq, mode);
1217         if (ret < 0)
1218                 return ret;
1219         return count;
1220 }
1221
1222 /* show mode entry (auto, none, host, dedicated or boost) */
1223 static ssize_t bq2415x_sysfs_show_mode(struct device *dev,
1224                                        struct device_attribute *attr,
1225                                        char *buf)
1226 {
1227         struct power_supply *psy = dev_get_drvdata(dev);
1228         struct bq2415x_device *bq = power_supply_get_drvdata(psy);
1229         ssize_t ret = 0;
1230
1231         if (bq->automode > 0)
1232                 ret += sprintf(buf+ret, "auto (");
1233
1234         switch (bq->mode) {
1235         case BQ2415X_MODE_OFF:
1236                 ret += sprintf(buf+ret, "off");
1237                 break;
1238         case BQ2415X_MODE_NONE:
1239                 ret += sprintf(buf+ret, "none");
1240                 break;
1241         case BQ2415X_MODE_HOST_CHARGER:
1242                 ret += sprintf(buf+ret, "host");
1243                 break;
1244         case BQ2415X_MODE_DEDICATED_CHARGER:
1245                 ret += sprintf(buf+ret, "dedicated");
1246                 break;
1247         case BQ2415X_MODE_BOOST:
1248                 ret += sprintf(buf+ret, "boost");
1249                 break;
1250         }
1251
1252         if (bq->automode > 0)
1253                 ret += sprintf(buf+ret, ")");
1254
1255         ret += sprintf(buf+ret, "\n");
1256         return ret;
1257 }
1258
1259 /* show reported_mode entry (none, host, dedicated or boost) */
1260 static ssize_t bq2415x_sysfs_show_reported_mode(struct device *dev,
1261                                                 struct device_attribute *attr,
1262                                                 char *buf)
1263 {
1264         struct power_supply *psy = dev_get_drvdata(dev);
1265         struct bq2415x_device *bq = power_supply_get_drvdata(psy);
1266
1267         if (bq->automode < 0)
1268                 return -EINVAL;
1269
1270         switch (bq->reported_mode) {
1271         case BQ2415X_MODE_OFF:
1272                 return sprintf(buf, "off\n");
1273         case BQ2415X_MODE_NONE:
1274                 return sprintf(buf, "none\n");
1275         case BQ2415X_MODE_HOST_CHARGER:
1276                 return sprintf(buf, "host\n");
1277         case BQ2415X_MODE_DEDICATED_CHARGER:
1278                 return sprintf(buf, "dedicated\n");
1279         case BQ2415X_MODE_BOOST:
1280                 return sprintf(buf, "boost\n");
1281         }
1282
1283         return -EINVAL;
1284 }
1285
1286 /* directly set raw value to chip register, format: 'register value' */
1287 static ssize_t bq2415x_sysfs_set_registers(struct device *dev,
1288                                            struct device_attribute *attr,
1289                                            const char *buf,
1290                                            size_t count)
1291 {
1292         struct power_supply *psy = dev_get_drvdata(dev);
1293         struct bq2415x_device *bq = power_supply_get_drvdata(psy);
1294         ssize_t ret = 0;
1295         unsigned int reg;
1296         unsigned int val;
1297
1298         if (sscanf(buf, "%x %x", &reg, &val) != 2)
1299                 return -EINVAL;
1300
1301         if (reg > 4 || val > 255)
1302                 return -EINVAL;
1303
1304         ret = bq2415x_i2c_write(bq, reg, val);
1305         if (ret < 0)
1306                 return ret;
1307         return count;
1308 }
1309
1310 /* print value of chip register, format: 'register=value' */
1311 static ssize_t bq2415x_sysfs_print_reg(struct bq2415x_device *bq,
1312                                        u8 reg,
1313                                        char *buf)
1314 {
1315         int ret = bq2415x_i2c_read(bq, reg);
1316
1317         if (ret < 0)
1318                 return sprintf(buf, "%#.2x=error %d\n", reg, ret);
1319         return sprintf(buf, "%#.2x=%#.2x\n", reg, ret);
1320 }
1321
1322 /* show all raw values of chip register, format per line: 'register=value' */
1323 static ssize_t bq2415x_sysfs_show_registers(struct device *dev,
1324                                             struct device_attribute *attr,
1325                                             char *buf)
1326 {
1327         struct power_supply *psy = dev_get_drvdata(dev);
1328         struct bq2415x_device *bq = power_supply_get_drvdata(psy);
1329         ssize_t ret = 0;
1330
1331         ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_STATUS, buf+ret);
1332         ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_CONTROL, buf+ret);
1333         ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_VOLTAGE, buf+ret);
1334         ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_VENDER, buf+ret);
1335         ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_CURRENT, buf+ret);
1336         return ret;
1337 }
1338
1339 /* set current and voltage limit entries (in mA or mV) */
1340 static ssize_t bq2415x_sysfs_set_limit(struct device *dev,
1341                                        struct device_attribute *attr,
1342                                        const char *buf,
1343                                        size_t count)
1344 {
1345         struct power_supply *psy = dev_get_drvdata(dev);
1346         struct bq2415x_device *bq = power_supply_get_drvdata(psy);
1347         long val;
1348         int ret;
1349
1350         if (kstrtol(buf, 10, &val) < 0)
1351                 return -EINVAL;
1352
1353         if (strcmp(attr->attr.name, "current_limit") == 0)
1354                 ret = bq2415x_set_current_limit(bq, val);
1355         else if (strcmp(attr->attr.name, "weak_battery_voltage") == 0)
1356                 ret = bq2415x_set_weak_battery_voltage(bq, val);
1357         else if (strcmp(attr->attr.name, "battery_regulation_voltage") == 0)
1358                 ret = bq2415x_set_battery_regulation_voltage(bq, val);
1359         else if (strcmp(attr->attr.name, "charge_current") == 0)
1360                 ret = bq2415x_set_charge_current(bq, val);
1361         else if (strcmp(attr->attr.name, "termination_current") == 0)
1362                 ret = bq2415x_set_termination_current(bq, val);
1363         else
1364                 return -EINVAL;
1365
1366         if (ret < 0)
1367                 return ret;
1368         return count;
1369 }
1370
1371 /* show current and voltage limit entries (in mA or mV) */
1372 static ssize_t bq2415x_sysfs_show_limit(struct device *dev,
1373                                         struct device_attribute *attr,
1374                                         char *buf)
1375 {
1376         struct power_supply *psy = dev_get_drvdata(dev);
1377         struct bq2415x_device *bq = power_supply_get_drvdata(psy);
1378         int ret;
1379
1380         if (strcmp(attr->attr.name, "current_limit") == 0)
1381                 ret = bq2415x_get_current_limit(bq);
1382         else if (strcmp(attr->attr.name, "weak_battery_voltage") == 0)
1383                 ret = bq2415x_get_weak_battery_voltage(bq);
1384         else if (strcmp(attr->attr.name, "battery_regulation_voltage") == 0)
1385                 ret = bq2415x_get_battery_regulation_voltage(bq);
1386         else if (strcmp(attr->attr.name, "charge_current") == 0)
1387                 ret = bq2415x_get_charge_current(bq);
1388         else if (strcmp(attr->attr.name, "termination_current") == 0)
1389                 ret = bq2415x_get_termination_current(bq);
1390         else
1391                 return -EINVAL;
1392
1393         if (ret < 0)
1394                 return ret;
1395         return sprintf(buf, "%d\n", ret);
1396 }
1397
1398 /* set *_enable entries */
1399 static ssize_t bq2415x_sysfs_set_enable(struct device *dev,
1400                                         struct device_attribute *attr,
1401                                         const char *buf,
1402                                         size_t count)
1403 {
1404         struct power_supply *psy = dev_get_drvdata(dev);
1405         struct bq2415x_device *bq = power_supply_get_drvdata(psy);
1406         enum bq2415x_command command;
1407         long val;
1408         int ret;
1409
1410         if (kstrtol(buf, 10, &val) < 0)
1411                 return -EINVAL;
1412
1413         if (strcmp(attr->attr.name, "charge_termination_enable") == 0)
1414                 command = val ? BQ2415X_CHARGE_TERMINATION_ENABLE :
1415                         BQ2415X_CHARGE_TERMINATION_DISABLE;
1416         else if (strcmp(attr->attr.name, "high_impedance_enable") == 0)
1417                 command = val ? BQ2415X_HIGH_IMPEDANCE_ENABLE :
1418                         BQ2415X_HIGH_IMPEDANCE_DISABLE;
1419         else if (strcmp(attr->attr.name, "otg_pin_enable") == 0)
1420                 command = val ? BQ2415X_OTG_PIN_ENABLE :
1421                         BQ2415X_OTG_PIN_DISABLE;
1422         else if (strcmp(attr->attr.name, "stat_pin_enable") == 0)
1423                 command = val ? BQ2415X_STAT_PIN_ENABLE :
1424                         BQ2415X_STAT_PIN_DISABLE;
1425         else
1426                 return -EINVAL;
1427
1428         ret = bq2415x_exec_command(bq, command);
1429         if (ret < 0)
1430                 return ret;
1431         return count;
1432 }
1433
1434 /* show *_enable entries */
1435 static ssize_t bq2415x_sysfs_show_enable(struct device *dev,
1436                                          struct device_attribute *attr,
1437                                          char *buf)
1438 {
1439         struct power_supply *psy = dev_get_drvdata(dev);
1440         struct bq2415x_device *bq = power_supply_get_drvdata(psy);
1441         enum bq2415x_command command;
1442         int ret;
1443
1444         if (strcmp(attr->attr.name, "charge_termination_enable") == 0)
1445                 command = BQ2415X_CHARGE_TERMINATION_STATUS;
1446         else if (strcmp(attr->attr.name, "high_impedance_enable") == 0)
1447                 command = BQ2415X_HIGH_IMPEDANCE_STATUS;
1448         else if (strcmp(attr->attr.name, "otg_pin_enable") == 0)
1449                 command = BQ2415X_OTG_PIN_STATUS;
1450         else if (strcmp(attr->attr.name, "stat_pin_enable") == 0)
1451                 command = BQ2415X_STAT_PIN_STATUS;
1452         else
1453                 return -EINVAL;
1454
1455         ret = bq2415x_exec_command(bq, command);
1456         if (ret < 0)
1457                 return ret;
1458         return sprintf(buf, "%d\n", ret);
1459 }
1460
1461 static DEVICE_ATTR(current_limit, S_IWUSR | S_IRUGO,
1462                 bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit);
1463 static DEVICE_ATTR(weak_battery_voltage, S_IWUSR | S_IRUGO,
1464                 bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit);
1465 static DEVICE_ATTR(battery_regulation_voltage, S_IWUSR | S_IRUGO,
1466                 bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit);
1467 static DEVICE_ATTR(charge_current, S_IWUSR | S_IRUGO,
1468                 bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit);
1469 static DEVICE_ATTR(termination_current, S_IWUSR | S_IRUGO,
1470                 bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit);
1471
1472 static DEVICE_ATTR(charge_termination_enable, S_IWUSR | S_IRUGO,
1473                 bq2415x_sysfs_show_enable, bq2415x_sysfs_set_enable);
1474 static DEVICE_ATTR(high_impedance_enable, S_IWUSR | S_IRUGO,
1475                 bq2415x_sysfs_show_enable, bq2415x_sysfs_set_enable);
1476 static DEVICE_ATTR(otg_pin_enable, S_IWUSR | S_IRUGO,
1477                 bq2415x_sysfs_show_enable, bq2415x_sysfs_set_enable);
1478 static DEVICE_ATTR(stat_pin_enable, S_IWUSR | S_IRUGO,
1479                 bq2415x_sysfs_show_enable, bq2415x_sysfs_set_enable);
1480
1481 static DEVICE_ATTR(reported_mode, S_IRUGO,
1482                 bq2415x_sysfs_show_reported_mode, NULL);
1483 static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO,
1484                 bq2415x_sysfs_show_mode, bq2415x_sysfs_set_mode);
1485 static DEVICE_ATTR(timer, S_IWUSR | S_IRUGO,
1486                 bq2415x_sysfs_show_timer, bq2415x_sysfs_set_timer);
1487
1488 static DEVICE_ATTR(registers, S_IWUSR | S_IRUGO,
1489                 bq2415x_sysfs_show_registers, bq2415x_sysfs_set_registers);
1490
1491 static DEVICE_ATTR(otg_status, S_IRUGO, bq2415x_sysfs_show_status, NULL);
1492 static DEVICE_ATTR(charge_status, S_IRUGO, bq2415x_sysfs_show_status, NULL);
1493 static DEVICE_ATTR(boost_status, S_IRUGO, bq2415x_sysfs_show_status, NULL);
1494 static DEVICE_ATTR(fault_status, S_IRUGO, bq2415x_sysfs_show_status, NULL);
1495
1496 static struct attribute *bq2415x_sysfs_attributes[] = {
1497         /*
1498          * TODO: some (appropriate) of these attrs should be switched to
1499          * use power supply class props.
1500          */
1501         &dev_attr_current_limit.attr,
1502         &dev_attr_weak_battery_voltage.attr,
1503         &dev_attr_battery_regulation_voltage.attr,
1504         &dev_attr_charge_current.attr,
1505         &dev_attr_termination_current.attr,
1506
1507         &dev_attr_charge_termination_enable.attr,
1508         &dev_attr_high_impedance_enable.attr,
1509         &dev_attr_otg_pin_enable.attr,
1510         &dev_attr_stat_pin_enable.attr,
1511
1512         &dev_attr_reported_mode.attr,
1513         &dev_attr_mode.attr,
1514         &dev_attr_timer.attr,
1515
1516         &dev_attr_registers.attr,
1517
1518         &dev_attr_otg_status.attr,
1519         &dev_attr_charge_status.attr,
1520         &dev_attr_boost_status.attr,
1521         &dev_attr_fault_status.attr,
1522         NULL,
1523 };
1524
1525 static const struct attribute_group bq2415x_sysfs_attr_group = {
1526         .attrs = bq2415x_sysfs_attributes,
1527 };
1528
1529 static int bq2415x_sysfs_init(struct bq2415x_device *bq)
1530 {
1531         return sysfs_create_group(&bq->charger->dev.kobj,
1532                         &bq2415x_sysfs_attr_group);
1533 }
1534
1535 static void bq2415x_sysfs_exit(struct bq2415x_device *bq)
1536 {
1537         sysfs_remove_group(&bq->charger->dev.kobj, &bq2415x_sysfs_attr_group);
1538 }
1539
1540 /* main bq2415x probe function */
1541 static int bq2415x_probe(struct i2c_client *client,
1542                          const struct i2c_device_id *id)
1543 {
1544         int ret;
1545         int num;
1546         char *name = NULL;
1547         struct bq2415x_device *bq;
1548         struct device_node *np = client->dev.of_node;
1549         struct bq2415x_platform_data *pdata = client->dev.platform_data;
1550         const struct acpi_device_id *acpi_id = NULL;
1551         struct power_supply *notify_psy = NULL;
1552         union power_supply_propval prop;
1553
1554         if (!np && !pdata && !ACPI_HANDLE(&client->dev)) {
1555                 dev_err(&client->dev, "Neither devicetree, nor platform data, nor ACPI support\n");
1556                 return -ENODEV;
1557         }
1558
1559         /* Get new ID for the new device */
1560         mutex_lock(&bq2415x_id_mutex);
1561         num = idr_alloc(&bq2415x_id, client, 0, 0, GFP_KERNEL);
1562         mutex_unlock(&bq2415x_id_mutex);
1563         if (num < 0)
1564                 return num;
1565
1566         if (id) {
1567                 name = kasprintf(GFP_KERNEL, "%s-%d", id->name, num);
1568         } else if (ACPI_HANDLE(&client->dev)) {
1569                 acpi_id =
1570                         acpi_match_device(client->dev.driver->acpi_match_table,
1571                                           &client->dev);
1572                 name = kasprintf(GFP_KERNEL, "%s-%d", acpi_id->id, num);
1573         }
1574         if (!name) {
1575                 dev_err(&client->dev, "failed to allocate device name\n");
1576                 ret = -ENOMEM;
1577                 goto error_1;
1578         }
1579
1580         bq = devm_kzalloc(&client->dev, sizeof(*bq), GFP_KERNEL);
1581         if (!bq) {
1582                 ret = -ENOMEM;
1583                 goto error_2;
1584         }
1585
1586         i2c_set_clientdata(client, bq);
1587
1588         bq->id = num;
1589         bq->dev = &client->dev;
1590         if (id)
1591                 bq->chip = id->driver_data;
1592         else if (ACPI_HANDLE(bq->dev))
1593                 bq->chip = acpi_id->driver_data;
1594         bq->name = name;
1595         bq->mode = BQ2415X_MODE_OFF;
1596         bq->reported_mode = BQ2415X_MODE_OFF;
1597         bq->autotimer = 0;
1598         bq->automode = 0;
1599
1600         if (np || ACPI_HANDLE(bq->dev)) {
1601                 ret = device_property_read_u32(bq->dev,
1602                                                "ti,current-limit",
1603                                                &bq->init_data.current_limit);
1604                 if (ret)
1605                         goto error_2;
1606                 ret = device_property_read_u32(bq->dev,
1607                                         "ti,weak-battery-voltage",
1608                                         &bq->init_data.weak_battery_voltage);
1609                 if (ret)
1610                         goto error_2;
1611                 ret = device_property_read_u32(bq->dev,
1612                                 "ti,battery-regulation-voltage",
1613                                 &bq->init_data.battery_regulation_voltage);
1614                 if (ret)
1615                         goto error_2;
1616                 ret = device_property_read_u32(bq->dev,
1617                                                "ti,charge-current",
1618                                                &bq->init_data.charge_current);
1619                 if (ret)
1620                         goto error_2;
1621                 ret = device_property_read_u32(bq->dev,
1622                                 "ti,termination-current",
1623                                 &bq->init_data.termination_current);
1624                 if (ret)
1625                         goto error_2;
1626                 ret = device_property_read_u32(bq->dev,
1627                                                "ti,resistor-sense",
1628                                                &bq->init_data.resistor_sense);
1629                 if (ret)
1630                         goto error_2;
1631                 if (np)
1632                         bq->notify_node = of_parse_phandle(np,
1633                                                 "ti,usb-charger-detection", 0);
1634         } else {
1635                 memcpy(&bq->init_data, pdata, sizeof(bq->init_data));
1636         }
1637
1638         bq2415x_reset_chip(bq);
1639
1640         ret = bq2415x_power_supply_init(bq);
1641         if (ret) {
1642                 dev_err(bq->dev, "failed to register power supply: %d\n", ret);
1643                 goto error_2;
1644         }
1645
1646         ret = bq2415x_sysfs_init(bq);
1647         if (ret) {
1648                 dev_err(bq->dev, "failed to create sysfs entries: %d\n", ret);
1649                 goto error_3;
1650         }
1651
1652         ret = bq2415x_set_defaults(bq);
1653         if (ret) {
1654                 dev_err(bq->dev, "failed to set default values: %d\n", ret);
1655                 goto error_4;
1656         }
1657
1658         if (bq->notify_node || bq->init_data.notify_device) {
1659                 bq->nb.notifier_call = bq2415x_notifier_call;
1660                 ret = power_supply_reg_notifier(&bq->nb);
1661                 if (ret) {
1662                         dev_err(bq->dev, "failed to reg notifier: %d\n", ret);
1663                         goto error_4;
1664                 }
1665
1666                 bq->automode = 1;
1667                 dev_info(bq->dev, "automode supported, waiting for events\n");
1668         } else {
1669                 bq->automode = -1;
1670                 dev_info(bq->dev, "automode not supported\n");
1671         }
1672
1673         /* Query for initial reported_mode and set it */
1674         if (bq->nb.notifier_call) {
1675                 if (np) {
1676                         notify_psy = power_supply_get_by_phandle(np,
1677                                                 "ti,usb-charger-detection");
1678                         if (IS_ERR(notify_psy))
1679                                 notify_psy = NULL;
1680                 } else if (bq->init_data.notify_device) {
1681                         notify_psy = power_supply_get_by_name(
1682                                                 bq->init_data.notify_device);
1683                 }
1684         }
1685         if (notify_psy) {
1686                 ret = power_supply_get_property(notify_psy,
1687                                         POWER_SUPPLY_PROP_CURRENT_MAX, &prop);
1688                 power_supply_put(notify_psy);
1689
1690                 if (ret == 0) {
1691                         bq2415x_update_reported_mode(bq, prop.intval);
1692                         bq2415x_set_mode(bq, bq->reported_mode);
1693                 }
1694         }
1695
1696         INIT_DELAYED_WORK(&bq->work, bq2415x_timer_work);
1697         bq2415x_set_autotimer(bq, 1);
1698
1699         dev_info(bq->dev, "driver registered\n");
1700         return 0;
1701
1702 error_4:
1703         bq2415x_sysfs_exit(bq);
1704 error_3:
1705         bq2415x_power_supply_exit(bq);
1706 error_2:
1707         if (bq && bq->notify_node)
1708                 of_node_put(bq->notify_node);
1709         kfree(name);
1710 error_1:
1711         mutex_lock(&bq2415x_id_mutex);
1712         idr_remove(&bq2415x_id, num);
1713         mutex_unlock(&bq2415x_id_mutex);
1714
1715         return ret;
1716 }
1717
1718 /* main bq2415x remove function */
1719
1720 static int bq2415x_remove(struct i2c_client *client)
1721 {
1722         struct bq2415x_device *bq = i2c_get_clientdata(client);
1723
1724         if (bq->nb.notifier_call)
1725                 power_supply_unreg_notifier(&bq->nb);
1726
1727         if (bq->notify_node)
1728                 of_node_put(bq->notify_node);
1729
1730         bq2415x_sysfs_exit(bq);
1731         bq2415x_power_supply_exit(bq);
1732
1733         bq2415x_reset_chip(bq);
1734
1735         mutex_lock(&bq2415x_id_mutex);
1736         idr_remove(&bq2415x_id, bq->id);
1737         mutex_unlock(&bq2415x_id_mutex);
1738
1739         dev_info(bq->dev, "driver unregistered\n");
1740
1741         kfree(bq->name);
1742
1743         return 0;
1744 }
1745
1746 static const struct i2c_device_id bq2415x_i2c_id_table[] = {
1747         { "bq2415x", BQUNKNOWN },
1748         { "bq24150", BQ24150 },
1749         { "bq24150a", BQ24150A },
1750         { "bq24151", BQ24151 },
1751         { "bq24151a", BQ24151A },
1752         { "bq24152", BQ24152 },
1753         { "bq24153", BQ24153 },
1754         { "bq24153a", BQ24153A },
1755         { "bq24155", BQ24155 },
1756         { "bq24156", BQ24156 },
1757         { "bq24156a", BQ24156A },
1758         { "bq24157s", BQ24157S },
1759         { "bq24158", BQ24158 },
1760         {},
1761 };
1762 MODULE_DEVICE_TABLE(i2c, bq2415x_i2c_id_table);
1763
1764 static const struct acpi_device_id bq2415x_i2c_acpi_match[] = {
1765         { "BQ2415X", BQUNKNOWN },
1766         { "BQ241500", BQ24150 },
1767         { "BQA24150", BQ24150A },
1768         { "BQ241510", BQ24151 },
1769         { "BQA24151", BQ24151A },
1770         { "BQ241520", BQ24152 },
1771         { "BQ241530", BQ24153 },
1772         { "BQA24153", BQ24153A },
1773         { "BQ241550", BQ24155 },
1774         { "BQ241560", BQ24156 },
1775         { "BQA24156", BQ24156A },
1776         { "BQS24157", BQ24157S },
1777         { "BQ241580", BQ24158 },
1778         {},
1779 };
1780 MODULE_DEVICE_TABLE(acpi, bq2415x_i2c_acpi_match);
1781
1782 static struct i2c_driver bq2415x_driver = {
1783         .driver = {
1784                 .name = "bq2415x-charger",
1785                 .acpi_match_table = ACPI_PTR(bq2415x_i2c_acpi_match),
1786         },
1787         .probe = bq2415x_probe,
1788         .remove = bq2415x_remove,
1789         .id_table = bq2415x_i2c_id_table,
1790 };
1791 module_i2c_driver(bq2415x_driver);
1792
1793 MODULE_AUTHOR("Pali Rohár <pali.rohar@gmail.com>");
1794 MODULE_DESCRIPTION("bq2415x charger driver");
1795 MODULE_LICENSE("GPL");