drivers/power/bq2415x_charger.c

   1 /*
   2  * bq2415x charger driver
   3  *
   4  * Copyright (C) 2011-2012  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  * 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 /*
  22  * Datasheets:
  23  * http://www.ti.com/product/bq24150
  24  * http://www.ti.com/product/bq24150a
  25  * http://www.ti.com/product/bq24152
  26  * http://www.ti.com/product/bq24153
  27  * http://www.ti.com/product/bq24153a
  28  * http://www.ti.com/product/bq24155
  29  */
  30
  31 #include <linux/kernel.h>
  32 #include <linux/module.h>
  33 #include <linux/param.h>
  34 #include <linux/err.h>
  35 #include <linux/workqueue.h>
  36 #include <linux/sysfs.h>
  37 #include <linux/platform_device.h>
  38 #include <linux/power_supply.h>
  39 #include <linux/idr.h>
  40 #include <linux/i2c.h>
  41 #include <linux/slab.h>
  42
  43 #include <linux/power/bq2415x_charger.h>
  44
  45 /* timeout for resetting chip timer */
  46 #define BQ2415X_TIMER_TIMEOUT           10
  47
  48 #define BQ2415X_REG_STATUS              0x00
  49 #define BQ2415X_REG_CONTROL             0x01
  50 #define BQ2415X_REG_VOLTAGE             0x02
  51 #define BQ2415X_REG_VENDER              0x03
  52 #define BQ2415X_REG_CURRENT             0x04
  53
  54 /* reset state for all registers */
  55 #define BQ2415X_RESET_STATUS            BIT(6)
  56 #define BQ2415X_RESET_CONTROL           (BIT(4)|BIT(5))
  57 #define BQ2415X_RESET_VOLTAGE           (BIT(1)|BIT(3))
  58 #define BQ2415X_RESET_CURRENT           (BIT(0)|BIT(3)|BIT(7))
  59
  60 /* status register */
  61 #define BQ2415X_BIT_TMR_RST             7
  62 #define BQ2415X_BIT_OTG                 7
  63 #define BQ2415X_BIT_EN_STAT             6
  64 #define BQ2415X_MASK_STAT               (BIT(4)|BIT(5))
  65 #define BQ2415X_SHIFT_STAT              4
  66 #define BQ2415X_BIT_BOOST               3
  67 #define BQ2415X_MASK_FAULT              (BIT(0)|BIT(1)|BIT(2))
  68 #define BQ2415X_SHIFT_FAULT             0
  69
  70 /* control register */
  71 #define BQ2415X_MASK_LIMIT              (BIT(6)|BIT(7))
  72 #define BQ2415X_SHIFT_LIMIT             6
  73 #define BQ2415X_MASK_VLOWV              (BIT(4)|BIT(5))
  74 #define BQ2415X_SHIFT_VLOWV             4
  75 #define BQ2415X_BIT_TE                  3
  76 #define BQ2415X_BIT_CE                  2
  77 #define BQ2415X_BIT_HZ_MODE             1
  78 #define BQ2415X_BIT_OPA_MODE            0
  79
  80 /* voltage register */
  81 #define BQ2415X_MASK_VO         (BIT(2)|BIT(3)|BIT(4)|BIT(5)|BIT(6)|BIT(7))
  82 #define BQ2415X_SHIFT_VO                2
  83 #define BQ2415X_BIT_OTG_PL              1
  84 #define BQ2415X_BIT_OTG_EN              0
  85
  86 /* vender register */
  87 #define BQ2415X_MASK_VENDER             (BIT(5)|BIT(6)|BIT(7))
  88 #define BQ2415X_SHIFT_VENDER            5
  89 #define BQ2415X_MASK_PN                 (BIT(3)|BIT(4))
  90 #define BQ2415X_SHIFT_PN                3
  91 #define BQ2415X_MASK_REVISION           (BIT(0)|BIT(1)|BIT(2))
  92 #define BQ2415X_SHIFT_REVISION          0
  93
  94 /* current register */
  95 #define BQ2415X_MASK_RESET              BIT(7)
  96 #define BQ2415X_MASK_VI_CHRG            (BIT(4)|BIT(5)|BIT(6))
  97 #define BQ2415X_SHIFT_VI_CHRG           4
  98 /* N/A                                  BIT(3) */
  99 #define BQ2415X_MASK_VI_TERM            (BIT(0)|BIT(1)|BIT(2))
 100 #define BQ2415X_SHIFT_VI_TERM           0
 101
 102
 103 enum bq2415x_command {
 104         BQ2415X_TIMER_RESET,
 105         BQ2415X_OTG_STATUS,
 106         BQ2415X_STAT_PIN_STATUS,
 107         BQ2415X_STAT_PIN_ENABLE,
 108         BQ2415X_STAT_PIN_DISABLE,
 109         BQ2415X_CHARGE_STATUS,
 110         BQ2415X_BOOST_STATUS,
 111         BQ2415X_FAULT_STATUS,
 112
 113         BQ2415X_CHARGE_TERMINATION_STATUS,
 114         BQ2415X_CHARGE_TERMINATION_ENABLE,
 115         BQ2415X_CHARGE_TERMINATION_DISABLE,
 116         BQ2415X_CHARGER_STATUS,
 117         BQ2415X_CHARGER_ENABLE,
 118         BQ2415X_CHARGER_DISABLE,
 119         BQ2415X_HIGH_IMPEDANCE_STATUS,
 120         BQ2415X_HIGH_IMPEDANCE_ENABLE,
 121         BQ2415X_HIGH_IMPEDANCE_DISABLE,
 122         BQ2415X_BOOST_MODE_STATUS,
 123         BQ2415X_BOOST_MODE_ENABLE,
 124         BQ2415X_BOOST_MODE_DISABLE,
 125
 126         BQ2415X_OTG_LEVEL,
 127         BQ2415X_OTG_ACTIVATE_HIGH,
 128         BQ2415X_OTG_ACTIVATE_LOW,
 129         BQ2415X_OTG_PIN_STATUS,
 130         BQ2415X_OTG_PIN_ENABLE,
 131         BQ2415X_OTG_PIN_DISABLE,
 132
 133         BQ2415X_VENDER_CODE,
 134         BQ2415X_PART_NUMBER,
 135         BQ2415X_REVISION,
 136 };
 137
 138 enum bq2415x_chip {
 139         BQUNKNOWN,
 140         BQ24150,
 141         BQ24150A,
 142         BQ24151,
 143         BQ24151A,
 144         BQ24152,
 145         BQ24153,
 146         BQ24153A,
 147         BQ24155,
 148         BQ24156,
 149         BQ24156A,
 150         BQ24158,
 151 };
 152
 153 static char *bq2415x_chip_name[] = {
 154         "unknown",
 155         "bq24150",
 156         "bq24150a",
 157         "bq24151",
 158         "bq24151a",
 159         "bq24152",
 160         "bq24153",
 161         "bq24153a",
 162         "bq24155",
 163         "bq24156",
 164         "bq24156a",
 165         "bq24158",
 166 };
 167
 168 struct bq2415x_device {
 169         struct device *dev;
 170         struct bq2415x_platform_data init_data;
 171         struct power_supply charger;
 172         struct delayed_work work;
 173         enum bq2415x_mode reported_mode;/* mode reported by hook function */
 174         enum bq2415x_mode mode;         /* current configured mode */
 175         enum bq2415x_chip chip;
 176         const char *timer_error;
 177         char *model;
 178         char *name;
 179         int autotimer;  /* 1 - if driver automatically reset timer, 0 - not */
 180         int automode;   /* 1 - enabled, 0 - disabled; -1 - not supported */
 181         int id;
 182 };
 183
 184 /* each registered chip must have unique id */
 185 static DEFINE_IDR(bq2415x_id);
 186
 187 static DEFINE_MUTEX(bq2415x_id_mutex);
 188 static DEFINE_MUTEX(bq2415x_timer_mutex);
 189 static DEFINE_MUTEX(bq2415x_i2c_mutex);
 190
 191 /**** i2c read functions ****/
 192
 193 /* read value from register */
 194 static int bq2415x_i2c_read(struct bq2415x_device *bq, u8 reg)
 195 {
 196         struct i2c_client *client = to_i2c_client(bq->dev);
 197         struct i2c_msg msg[2];
 198         u8 val;
 199         int ret;
 200
 201         if (!client->adapter)
 202                 return -ENODEV;
 203
 204         msg[0].addr = client->addr;
 205         msg[0].flags = 0;
 206         msg[0].buf = &reg;
 207         msg[0].len = sizeof(reg);
 208         msg[1].addr = client->addr;
 209         msg[1].flags = I2C_M_RD;
 210         msg[1].buf = &val;
 211         msg[1].len = sizeof(val);
 212
 213         mutex_lock(&bq2415x_i2c_mutex);
 214         ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
 215         mutex_unlock(&bq2415x_i2c_mutex);
 216
 217         if (ret < 0)
 218                 return ret;
 219
 220         return val;
 221 }
 222
 223 /* read value from register, apply mask and right shift it */
 224 static int bq2415x_i2c_read_mask(struct bq2415x_device *bq, u8 reg,
 225                                  u8 mask, u8 shift)
 226 {
 227         int ret;
 228
 229         if (shift > 8)
 230                 return -EINVAL;
 231
 232         ret = bq2415x_i2c_read(bq, reg);
 233         if (ret < 0)
 234                 return ret;
 235         return (ret & mask) >> shift;
 236 }
 237
 238 /* read value from register and return one specified bit */
 239 static int bq2415x_i2c_read_bit(struct bq2415x_device *bq, u8 reg, u8 bit)
 240 {
 241         if (bit > 8)
 242                 return -EINVAL;
 243         return bq2415x_i2c_read_mask(bq, reg, BIT(bit), bit);
 244 }
 245
 246 /**** i2c write functions ****/
 247
 248 /* write value to register */
 249 static int bq2415x_i2c_write(struct bq2415x_device *bq, u8 reg, u8 val)
 250 {
 251         struct i2c_client *client = to_i2c_client(bq->dev);
 252         struct i2c_msg msg[1];
 253         u8 data[2];
 254         int ret;
 255
 256         data[0] = reg;
 257         data[1] = val;
 258
 259         msg[0].addr = client->addr;
 260         msg[0].flags = 0;
 261         msg[0].buf = data;
 262         msg[0].len = ARRAY_SIZE(data);
 263
 264         mutex_lock(&bq2415x_i2c_mutex);
 265         ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
 266         mutex_unlock(&bq2415x_i2c_mutex);
 267
 268         /* i2c_transfer returns number of messages transferred */
 269         if (ret < 0)
 270                 return ret;
 271         else if (ret != 1)
 272                 return -EIO;
 273
 274         return 0;
 275 }
 276
 277 /* read value from register, change it with mask left shifted and write back */
 278 static int bq2415x_i2c_write_mask(struct bq2415x_device *bq, u8 reg, u8 val,
 279                                   u8 mask, u8 shift)
 280 {
 281         int ret;
 282
 283         if (shift > 8)
 284                 return -EINVAL;
 285
 286         ret = bq2415x_i2c_read(bq, reg);
 287         if (ret < 0)
 288                 return ret;
 289
 290         ret &= ~mask;
 291         ret |= val << shift;
 292
 293         return bq2415x_i2c_write(bq, reg, ret);
 294 }
 295
 296 /* change only one bit in register */
 297 static int bq2415x_i2c_write_bit(struct bq2415x_device *bq, u8 reg,
 298                                  bool val, u8 bit)
 299 {
 300         if (bit > 8)
 301                 return -EINVAL;
 302         return bq2415x_i2c_write_mask(bq, reg, val, BIT(bit), bit);
 303 }
 304
 305 /**** global functions ****/
 306
 307 /* exec command function */
 308 static int bq2415x_exec_command(struct bq2415x_device *bq,
 309                                 enum bq2415x_command command)
 310 {
 311         int ret;
 312
 313         switch (command) {
 314         case BQ2415X_TIMER_RESET:
 315                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_STATUS,
 316                                 1, BQ2415X_BIT_TMR_RST);
 317         case BQ2415X_OTG_STATUS:
 318                 return bq2415x_i2c_read_bit(bq, BQ2415X_REG_STATUS,
 319                                 BQ2415X_BIT_OTG);
 320         case BQ2415X_STAT_PIN_STATUS:
 321                 return bq2415x_i2c_read_bit(bq, BQ2415X_REG_STATUS,
 322                                 BQ2415X_BIT_EN_STAT);
 323         case BQ2415X_STAT_PIN_ENABLE:
 324                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_STATUS, 1,
 325                                 BQ2415X_BIT_EN_STAT);
 326         case BQ2415X_STAT_PIN_DISABLE:
 327                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_STATUS, 0,
 328                                 BQ2415X_BIT_EN_STAT);
 329         case BQ2415X_CHARGE_STATUS:
 330                 return bq2415x_i2c_read_mask(bq, BQ2415X_REG_STATUS,
 331                                 BQ2415X_MASK_STAT, BQ2415X_SHIFT_STAT);
 332         case BQ2415X_BOOST_STATUS:
 333                 return bq2415x_i2c_read_bit(bq, BQ2415X_REG_STATUS,
 334                                 BQ2415X_BIT_BOOST);
 335         case BQ2415X_FAULT_STATUS:
 336                 return bq2415x_i2c_read_mask(bq, BQ2415X_REG_STATUS,
 337                         BQ2415X_MASK_FAULT, BQ2415X_SHIFT_FAULT);
 338
 339         case BQ2415X_CHARGE_TERMINATION_STATUS:
 340                 return bq2415x_i2c_read_bit(bq, BQ2415X_REG_CONTROL,
 341                                 BQ2415X_BIT_TE);
 342         case BQ2415X_CHARGE_TERMINATION_ENABLE:
 343                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
 344                                 1, BQ2415X_BIT_TE);
 345         case BQ2415X_CHARGE_TERMINATION_DISABLE:
 346                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
 347                                 0, BQ2415X_BIT_TE);
 348         case BQ2415X_CHARGER_STATUS:
 349                 ret = bq2415x_i2c_read_bit(bq, BQ2415X_REG_CONTROL,
 350                         BQ2415X_BIT_CE);
 351                 if (ret < 0)
 352                         return ret;
 353                 else
 354                         return ret > 0 ? 0 : 1;
 355         case BQ2415X_CHARGER_ENABLE:
 356                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
 357                                 0, BQ2415X_BIT_CE);
 358         case BQ2415X_CHARGER_DISABLE:
 359                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
 360                                 1, BQ2415X_BIT_CE);
 361         case BQ2415X_HIGH_IMPEDANCE_STATUS:
 362                 return bq2415x_i2c_read_bit(bq, BQ2415X_REG_CONTROL,
 363                                 BQ2415X_BIT_HZ_MODE);
 364         case BQ2415X_HIGH_IMPEDANCE_ENABLE:
 365                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
 366                                 1, BQ2415X_BIT_HZ_MODE);
 367         case BQ2415X_HIGH_IMPEDANCE_DISABLE:
 368                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
 369                                 0, BQ2415X_BIT_HZ_MODE);
 370         case BQ2415X_BOOST_MODE_STATUS:
 371                 return bq2415x_i2c_read_bit(bq, BQ2415X_REG_CONTROL,
 372                                 BQ2415X_BIT_OPA_MODE);
 373         case BQ2415X_BOOST_MODE_ENABLE:
 374                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
 375                                 1, BQ2415X_BIT_OPA_MODE);
 376         case BQ2415X_BOOST_MODE_DISABLE:
 377                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
 378                                 0, BQ2415X_BIT_OPA_MODE);
 379
 380         case BQ2415X_OTG_LEVEL:
 381                 return bq2415x_i2c_read_bit(bq, BQ2415X_REG_VOLTAGE,
 382                                 BQ2415X_BIT_OTG_PL);
 383         case BQ2415X_OTG_ACTIVATE_HIGH:
 384                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_VOLTAGE,
 385                                 1, BQ2415X_BIT_OTG_PL);
 386         case BQ2415X_OTG_ACTIVATE_LOW:
 387                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_VOLTAGE,
 388                                 0, BQ2415X_BIT_OTG_PL);
 389         case BQ2415X_OTG_PIN_STATUS:
 390                 return bq2415x_i2c_read_bit(bq, BQ2415X_REG_VOLTAGE,
 391                                 BQ2415X_BIT_OTG_EN);
 392         case BQ2415X_OTG_PIN_ENABLE:
 393                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_VOLTAGE,
 394                                 1, BQ2415X_BIT_OTG_EN);
 395         case BQ2415X_OTG_PIN_DISABLE:
 396                 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_VOLTAGE,
 397                                 0, BQ2415X_BIT_OTG_EN);
 398
 399         case BQ2415X_VENDER_CODE:
 400                 return bq2415x_i2c_read_mask(bq, BQ2415X_REG_VENDER,
 401                         BQ2415X_MASK_VENDER, BQ2415X_SHIFT_VENDER);
 402         case BQ2415X_PART_NUMBER:
 403                 return bq2415x_i2c_read_mask(bq, BQ2415X_REG_VENDER,
 404                                 BQ2415X_MASK_PN, BQ2415X_SHIFT_PN);
 405         case BQ2415X_REVISION:
 406                 return bq2415x_i2c_read_mask(bq, BQ2415X_REG_VENDER,
 407                         BQ2415X_MASK_REVISION, BQ2415X_SHIFT_REVISION);
 408         }
 409         return -EINVAL;
 410 }
 411
 412 /* detect chip type */
 413 static enum bq2415x_chip bq2415x_detect_chip(struct bq2415x_device *bq)
 414 {
 415         struct i2c_client *client = to_i2c_client(bq->dev);
 416         int ret = bq2415x_exec_command(bq, BQ2415X_PART_NUMBER);
 417
 418         if (ret < 0)
 419                 return ret;
 420
 421         switch (client->addr) {
 422         case 0x6b:
 423                 switch (ret) {
 424                 case 0:
 425                         if (bq->chip == BQ24151A)
 426                                 return bq->chip;
 427                         else
 428                                 return BQ24151;
 429                 case 1:
 430                         if (bq->chip == BQ24150A ||
 431                                 bq->chip == BQ24152 ||
 432                                 bq->chip == BQ24155)
 433                                 return bq->chip;
 434                         else
 435                                 return BQ24150;
 436                 case 2:
 437                         if (bq->chip == BQ24153A)
 438                                 return bq->chip;
 439                         else
 440                                 return BQ24153;
 441                 default:
 442                         return BQUNKNOWN;
 443                 }
 444                 break;
 445
 446         case 0x6a:
 447                 switch (ret) {
 448                 case 0:
 449                         if (bq->chip == BQ24156A)
 450                                 return bq->chip;
 451                         else
 452                                 return BQ24156;
 453                 case 2:
 454                         return BQ24158;
 455                 default:
 456                         return BQUNKNOWN;
 457                 }
 458                 break;
 459         }
 460
 461         return BQUNKNOWN;
 462 }
 463
 464 /* detect chip revision */
 465 static int bq2415x_detect_revision(struct bq2415x_device *bq)
 466 {
 467         int ret = bq2415x_exec_command(bq, BQ2415X_REVISION);
 468         int chip = bq2415x_detect_chip(bq);
 469
 470         if (ret < 0 || chip < 0)
 471                 return -1;
 472
 473         switch (chip) {
 474         case BQ24150:
 475         case BQ24150A:
 476         case BQ24151:
 477         case BQ24151A:
 478         case BQ24152:
 479                 if (ret >= 0 && ret <= 3)
 480                         return ret;
 481                 else
 482                         return -1;
 483         case BQ24153:
 484         case BQ24153A:
 485         case BQ24156:
 486         case BQ24156A:
 487         case BQ24158:
 488                 if (ret == 3)
 489                         return 0;
 490                 else if (ret == 1)
 491                         return 1;
 492                 else
 493                         return -1;
 494         case BQ24155:
 495                 if (ret == 3)
 496                         return 3;
 497                 else
 498                         return -1;
 499         case BQUNKNOWN:
 500                 return -1;
 501         }
 502
 503         return -1;
 504 }
 505
 506 /* return chip vender code */
 507 static int bq2415x_get_vender_code(struct bq2415x_device *bq)
 508 {
 509         int ret;
 510
 511         ret = bq2415x_exec_command(bq, BQ2415X_VENDER_CODE);
 512         if (ret < 0)
 513                 return 0;
 514
 515         /* convert to binary */
 516         return (ret & 0x1) +
 517                ((ret >> 1) & 0x1) * 10 +
 518                ((ret >> 2) & 0x1) * 100;
 519 }
 520
 521 /* reset all chip registers to default state */
 522 static void bq2415x_reset_chip(struct bq2415x_device *bq)
 523 {
 524         bq2415x_i2c_write(bq, BQ2415X_REG_CURRENT, BQ2415X_RESET_CURRENT);
 525         bq2415x_i2c_write(bq, BQ2415X_REG_VOLTAGE, BQ2415X_RESET_VOLTAGE);
 526         bq2415x_i2c_write(bq, BQ2415X_REG_CONTROL, BQ2415X_RESET_CONTROL);
 527         bq2415x_i2c_write(bq, BQ2415X_REG_STATUS, BQ2415X_RESET_STATUS);
 528         bq->timer_error = NULL;
 529 }
 530
 531 /**** properties functions ****/
 532
 533 /* set current limit in mA */
 534 static int bq2415x_set_current_limit(struct bq2415x_device *bq, int mA)
 535 {
 536         int val;
 537
 538         if (mA <= 100)
 539                 val = 0;
 540         else if (mA <= 500)
 541                 val = 1;
 542         else if (mA <= 800)
 543                 val = 2;
 544         else
 545                 val = 3;
 546
 547         return bq2415x_i2c_write_mask(bq, BQ2415X_REG_CONTROL, val,
 548                         BQ2415X_MASK_LIMIT, BQ2415X_SHIFT_LIMIT);
 549 }
 550
 551 /* get current limit in mA */
 552 static int bq2415x_get_current_limit(struct bq2415x_device *bq)
 553 {
 554         int ret;
 555
 556         ret = bq2415x_i2c_read_mask(bq, BQ2415X_REG_CONTROL,
 557                         BQ2415X_MASK_LIMIT, BQ2415X_SHIFT_LIMIT);
 558         if (ret < 0)
 559                 return ret;
 560         else if (ret == 0)
 561                 return 100;
 562         else if (ret == 1)
 563                 return 500;
 564         else if (ret == 2)
 565                 return 800;
 566         else if (ret == 3)
 567                 return 1800;
 568         return -EINVAL;
 569 }
 570
 571 /* set weak battery voltage in mV */
 572 static int bq2415x_set_weak_battery_voltage(struct bq2415x_device *bq, int mV)
 573 {
 574         int val;
 575
 576         /* round to 100mV */
 577         if (mV <= 3400 + 50)
 578                 val = 0;
 579         else if (mV <= 3500 + 50)
 580                 val = 1;
 581         else if (mV <= 3600 + 50)
 582                 val = 2;
 583         else
 584                 val = 3;
 585
 586         return bq2415x_i2c_write_mask(bq, BQ2415X_REG_CONTROL, val,
 587                         BQ2415X_MASK_VLOWV, BQ2415X_SHIFT_VLOWV);
 588 }
 589
 590 /* get weak battery voltage in mV */
 591 static int bq2415x_get_weak_battery_voltage(struct bq2415x_device *bq)
 592 {
 593         int ret;
 594
 595         ret = bq2415x_i2c_read_mask(bq, BQ2415X_REG_CONTROL,
 596                         BQ2415X_MASK_VLOWV, BQ2415X_SHIFT_VLOWV);
 597         if (ret < 0)
 598                 return ret;
 599         return 100 * (34 + ret);
 600 }
 601
 602 /* set battery regulation voltage in mV */
 603 static int bq2415x_set_battery_regulation_voltage(struct bq2415x_device *bq,
 604                                                   int mV)
 605 {
 606         int val = (mV/10 - 350) / 2;
 607
 608         if (val < 0)
 609                 val = 0;
 610         else if (val > 94) /* FIXME: Max is 94 or 122 ? Set max value ? */
 611                 return -EINVAL;
 612
 613         return bq2415x_i2c_write_mask(bq, BQ2415X_REG_VOLTAGE, val,
 614                         BQ2415X_MASK_VO, BQ2415X_SHIFT_VO);
 615 }
 616
 617 /* get battery regulation voltage in mV */
 618 static int bq2415x_get_battery_regulation_voltage(struct bq2415x_device *bq)
 619 {
 620         int ret = bq2415x_i2c_read_mask(bq, BQ2415X_REG_VOLTAGE,
 621                         BQ2415X_MASK_VO, BQ2415X_SHIFT_VO);
 622
 623         if (ret < 0)
 624                 return ret;
 625         return 10 * (350 + 2*ret);
 626 }
 627
 628 /* set charge current in mA (platform data must provide resistor sense) */
 629 static int bq2415x_set_charge_current(struct bq2415x_device *bq, int mA)
 630 {
 631         int val;
 632
 633         if (bq->init_data.resistor_sense <= 0)
 634                 return -ENOSYS;
 635
 636         val = (mA * bq->init_data.resistor_sense - 37400) / 6800;
 637         if (val < 0)
 638                 val = 0;
 639         else if (val > 7)
 640                 val = 7;
 641
 642         return bq2415x_i2c_write_mask(bq, BQ2415X_REG_CURRENT, val,
 643                         BQ2415X_MASK_VI_CHRG | BQ2415X_MASK_RESET,
 644                         BQ2415X_SHIFT_VI_CHRG);
 645 }
 646
 647 /* get charge current in mA (platform data must provide resistor sense) */
 648 static int bq2415x_get_charge_current(struct bq2415x_device *bq)
 649 {
 650         int ret;
 651
 652         if (bq->init_data.resistor_sense <= 0)
 653                 return -ENOSYS;
 654
 655         ret = bq2415x_i2c_read_mask(bq, BQ2415X_REG_CURRENT,
 656                         BQ2415X_MASK_VI_CHRG, BQ2415X_SHIFT_VI_CHRG);
 657         if (ret < 0)
 658                 return ret;
 659         return (37400 + 6800*ret) / bq->init_data.resistor_sense;
 660 }
 661
 662 /* set termination current in mA (platform data must provide resistor sense) */
 663 static int bq2415x_set_termination_current(struct bq2415x_device *bq, int mA)
 664 {
 665         int val;
 666
 667         if (bq->init_data.resistor_sense <= 0)
 668                 return -ENOSYS;
 669
 670         val = (mA * bq->init_data.resistor_sense - 3400) / 3400;
 671         if (val < 0)
 672                 val = 0;
 673         else if (val > 7)
 674                 val = 7;
 675
 676         return bq2415x_i2c_write_mask(bq, BQ2415X_REG_CURRENT, val,
 677                         BQ2415X_MASK_VI_TERM | BQ2415X_MASK_RESET,
 678                         BQ2415X_SHIFT_VI_TERM);
 679 }
 680
 681 /* get termination current in mA (platform data must provide resistor sense) */
 682 static int bq2415x_get_termination_current(struct bq2415x_device *bq)
 683 {
 684         int ret;
 685
 686         if (bq->init_data.resistor_sense <= 0)
 687                 return -ENOSYS;
 688
 689         ret = bq2415x_i2c_read_mask(bq, BQ2415X_REG_CURRENT,
 690                         BQ2415X_MASK_VI_TERM, BQ2415X_SHIFT_VI_TERM);
 691         if (ret < 0)
 692                 return ret;
 693         return (3400 + 3400*ret) / bq->init_data.resistor_sense;
 694 }
 695
 696 /* set default value of property */
 697 #define bq2415x_set_default_value(bq, prop) \
 698         do { \
 699                 int ret = 0; \
 700                 if (bq->init_data.prop != -1) \
 701                         ret = bq2415x_set_##prop(bq, bq->init_data.prop); \
 702                 if (ret < 0) \
 703                         return ret; \
 704         } while (0)
 705
 706 /* set default values of all properties */
 707 static int bq2415x_set_defaults(struct bq2415x_device *bq)
 708 {
 709         bq2415x_exec_command(bq, BQ2415X_BOOST_MODE_DISABLE);
 710         bq2415x_exec_command(bq, BQ2415X_CHARGER_DISABLE);
 711         bq2415x_exec_command(bq, BQ2415X_CHARGE_TERMINATION_DISABLE);
 712
 713         bq2415x_set_default_value(bq, current_limit);
 714         bq2415x_set_default_value(bq, weak_battery_voltage);
 715         bq2415x_set_default_value(bq, battery_regulation_voltage);
 716
 717         if (bq->init_data.resistor_sense > 0) {
 718                 bq2415x_set_default_value(bq, charge_current);
 719                 bq2415x_set_default_value(bq, termination_current);
 720                 bq2415x_exec_command(bq, BQ2415X_CHARGE_TERMINATION_ENABLE);
 721         }
 722
 723         bq2415x_exec_command(bq, BQ2415X_CHARGER_ENABLE);
 724         return 0;
 725 }
 726
 727 /**** charger mode functions ****/
 728
 729 /* set charger mode */
 730 static int bq2415x_set_mode(struct bq2415x_device *bq, enum bq2415x_mode mode)
 731 {
 732         int ret = 0;
 733         int charger = 0;
 734         int boost = 0;
 735
 736         if (mode == BQ2415X_MODE_HOST_CHARGER ||
 737                 mode == BQ2415X_MODE_DEDICATED_CHARGER)
 738                         charger = 1;
 739
 740         if (mode == BQ2415X_MODE_BOOST)
 741                 boost = 1;
 742
 743         if (!charger)
 744                 ret = bq2415x_exec_command(bq, BQ2415X_CHARGER_DISABLE);
 745
 746         if (!boost)
 747                 ret = bq2415x_exec_command(bq, BQ2415X_BOOST_MODE_DISABLE);
 748
 749         if (ret < 0)
 750                 return ret;
 751
 752         switch (mode) {
 753         case BQ2415X_MODE_NONE:
 754                 dev_dbg(bq->dev, "changing mode to: N/A\n");
 755                 ret = bq2415x_set_current_limit(bq, 100);
 756                 break;
 757         case BQ2415X_MODE_HOST_CHARGER:
 758                 dev_dbg(bq->dev, "changing mode to: Host/HUB charger\n");
 759                 ret = bq2415x_set_current_limit(bq, 500);
 760                 break;
 761         case BQ2415X_MODE_DEDICATED_CHARGER:
 762                 dev_dbg(bq->dev, "changing mode to: Dedicated charger\n");
 763                 ret = bq2415x_set_current_limit(bq, 1800);
 764                 break;
 765         case BQ2415X_MODE_BOOST: /* Boost mode */
 766                 dev_dbg(bq->dev, "changing mode to: Boost\n");
 767                 ret = bq2415x_set_current_limit(bq, 100);
 768                 break;
 769         }
 770
 771         if (ret < 0)
 772                 return ret;
 773
 774         if (charger)
 775                 ret = bq2415x_exec_command(bq, BQ2415X_CHARGER_ENABLE);
 776         else if (boost)
 777                 ret = bq2415x_exec_command(bq, BQ2415X_BOOST_MODE_ENABLE);
 778
 779         if (ret < 0)
 780                 return ret;
 781
 782         bq2415x_set_default_value(bq, weak_battery_voltage);
 783         bq2415x_set_default_value(bq, battery_regulation_voltage);
 784
 785         bq->mode = mode;
 786         sysfs_notify(&bq->charger.dev->kobj, NULL, "mode");
 787
 788         return 0;
 789
 790 }
 791
 792 /* hook function called by other driver which set reported mode */
 793 static void bq2415x_hook_function(enum bq2415x_mode mode, void *data)
 794 {
 795         struct bq2415x_device *bq = data;
 796
 797         if (!bq)
 798                 return;
 799
 800         dev_dbg(bq->dev, "hook function was called\n");
 801         bq->reported_mode = mode;
 802
 803         /* if automode is not enabled do not tell about reported_mode */
 804         if (bq->automode < 1)
 805                 return;
 806
 807         sysfs_notify(&bq->charger.dev->kobj, NULL, "reported_mode");
 808         bq2415x_set_mode(bq, bq->reported_mode);
 809
 810 }
 811
 812 /**** timer functions ****/
 813
 814 /* enable/disable auto resetting chip timer */
 815 static void bq2415x_set_autotimer(struct bq2415x_device *bq, int state)
 816 {
 817         mutex_lock(&bq2415x_timer_mutex);
 818
 819         if (bq->autotimer == state) {
 820                 mutex_unlock(&bq2415x_timer_mutex);
 821                 return;
 822         }
 823
 824         bq->autotimer = state;
 825
 826         if (state) {
 827                 schedule_delayed_work(&bq->work, BQ2415X_TIMER_TIMEOUT * HZ);
 828                 bq2415x_exec_command(bq, BQ2415X_TIMER_RESET);
 829                 bq->timer_error = NULL;
 830         } else {
 831                 cancel_delayed_work_sync(&bq->work);
 832         }
 833
 834         mutex_unlock(&bq2415x_timer_mutex);
 835 }
 836
 837 /* called by bq2415x_timer_work on timer error */
 838 static void bq2415x_timer_error(struct bq2415x_device *bq, const char *msg)
 839 {
 840         bq->timer_error = msg;
 841         sysfs_notify(&bq->charger.dev->kobj, NULL, "timer");
 842         dev_err(bq->dev, "%s\n", msg);
 843         if (bq->automode > 0)
 844                 bq->automode = 0;
 845         bq2415x_set_mode(bq, BQ2415X_MODE_NONE);
 846         bq2415x_set_autotimer(bq, 0);
 847 }
 848
 849 /* delayed work function for auto resetting chip timer */
 850 static void bq2415x_timer_work(struct work_struct *work)
 851 {
 852         struct bq2415x_device *bq = container_of(work, struct bq2415x_device,
 853                                                  work.work);
 854         int ret;
 855         int error;
 856         int boost;
 857
 858         if (!bq->autotimer)
 859                 return;
 860
 861         ret = bq2415x_exec_command(bq, BQ2415X_TIMER_RESET);
 862         if (ret < 0) {
 863                 bq2415x_timer_error(bq, "Resetting timer failed");
 864                 return;
 865         }
 866
 867         boost = bq2415x_exec_command(bq, BQ2415X_BOOST_MODE_STATUS);
 868         if (boost < 0) {
 869                 bq2415x_timer_error(bq, "Unknown error");
 870                 return;
 871         }
 872
 873         error = bq2415x_exec_command(bq, BQ2415X_FAULT_STATUS);
 874         if (error < 0) {
 875                 bq2415x_timer_error(bq, "Unknown error");
 876                 return;
 877         }
 878
 879         if (boost) {
 880                 switch (error) {
 881                 /* Non fatal errors, chip is OK */
 882                 case 0: /* No error */
 883                         break;
 884                 case 6: /* Timer expired */
 885                         dev_err(bq->dev, "Timer expired\n");
 886                         break;
 887                 case 3: /* Battery voltage too low */
 888                         dev_err(bq->dev, "Battery voltage to low\n");
 889                         break;
 890
 891                 /* Fatal errors, disable and reset chip */
 892                 case 1: /* Overvoltage protection (chip fried) */
 893                         bq2415x_timer_error(bq,
 894                                 "Overvoltage protection (chip fried)");
 895                         return;
 896                 case 2: /* Overload */
 897                         bq2415x_timer_error(bq, "Overload");
 898                         return;
 899                 case 4: /* Battery overvoltage protection */
 900                         bq2415x_timer_error(bq,
 901                                 "Battery overvoltage protection");
 902                         return;
 903                 case 5: /* Thermal shutdown (too hot) */
 904                         bq2415x_timer_error(bq,
 905                                         "Thermal shutdown (too hot)");
 906                         return;
 907                 case 7: /* N/A */
 908                         bq2415x_timer_error(bq, "Unknown error");
 909                         return;
 910                 }
 911         } else {
 912                 switch (error) {
 913                 /* Non fatal errors, chip is OK */
 914                 case 0: /* No error */
 915                         break;
 916                 case 2: /* Sleep mode */
 917                         dev_err(bq->dev, "Sleep mode\n");
 918                         break;
 919                 case 3: /* Poor input source */
 920                         dev_err(bq->dev, "Poor input source\n");
 921                         break;
 922                 case 6: /* Timer expired */
 923                         dev_err(bq->dev, "Timer expired\n");
 924                         break;
 925                 case 7: /* No battery */
 926                         dev_err(bq->dev, "No battery\n");
 927                         break;
 928
 929                 /* Fatal errors, disable and reset chip */
 930                 case 1: /* Overvoltage protection (chip fried) */
 931                         bq2415x_timer_error(bq,
 932                                 "Overvoltage protection (chip fried)");
 933                         return;
 934                 case 4: /* Battery overvoltage protection */
 935                         bq2415x_timer_error(bq,
 936                                 "Battery overvoltage protection");
 937                         return;
 938                 case 5: /* Thermal shutdown (too hot) */
 939                         bq2415x_timer_error(bq,
 940                                 "Thermal shutdown (too hot)");
 941                         return;
 942                 }
 943         }
 944
 945         schedule_delayed_work(&bq->work, BQ2415X_TIMER_TIMEOUT * HZ);
 946 }
 947
 948 /**** power supply interface code ****/
 949
 950 static enum power_supply_property bq2415x_power_supply_props[] = {
 951         /* TODO: maybe add more power supply properties */
 952         POWER_SUPPLY_PROP_STATUS,
 953         POWER_SUPPLY_PROP_MODEL_NAME,
 954 };
 955
 956 static int bq2415x_power_supply_get_property(struct power_supply *psy,
 957                                              enum power_supply_property psp,
 958                                              union power_supply_propval *val)
 959 {
 960         struct bq2415x_device *bq = container_of(psy, struct bq2415x_device,
 961                                                  charger);
 962         int ret;
 963
 964         switch (psp) {
 965         case POWER_SUPPLY_PROP_STATUS:
 966                 ret = bq2415x_exec_command(bq, BQ2415X_CHARGE_STATUS);
 967                 if (ret < 0)
 968                         return ret;
 969                 else if (ret == 0) /* Ready */
 970                         val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
 971                 else if (ret == 1) /* Charge in progress */
 972                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
 973                 else if (ret == 2) /* Charge done */
 974                         val->intval = POWER_SUPPLY_STATUS_FULL;
 975                 else
 976                         val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
 977                 break;
 978         case POWER_SUPPLY_PROP_MODEL_NAME:
 979                 val->strval = bq->model;
 980                 break;
 981         default:
 982                 return -EINVAL;
 983         }
 984         return 0;
 985 }
 986
 987 static int bq2415x_power_supply_init(struct bq2415x_device *bq)
 988 {
 989         int ret;
 990         int chip;
 991         char revstr[8];
 992
 993         bq->charger.name = bq->name;
 994         bq->charger.type = POWER_SUPPLY_TYPE_USB;
 995         bq->charger.properties = bq2415x_power_supply_props;
 996         bq->charger.num_properties = ARRAY_SIZE(bq2415x_power_supply_props);
 997         bq->charger.get_property = bq2415x_power_supply_get_property;
 998
 999         ret = bq2415x_detect_chip(bq);
1000         if (ret < 0)
1001                 chip = BQUNKNOWN;
1002         else
1003                 chip = ret;
1004
1005         ret = bq2415x_detect_revision(bq);
1006         if (ret < 0)
1007                 strcpy(revstr, "unknown");
1008         else
1009                 sprintf(revstr, "1.%d", ret);
1010
1011         bq->model = kasprintf(GFP_KERNEL,
1012                                 "chip %s, revision %s, vender code %.3d",
1013                                 bq2415x_chip_name[chip], revstr,
1014                                 bq2415x_get_vender_code(bq));
1015         if (!bq->model) {
1016                 dev_err(bq->dev, "failed to allocate model name\n");
1017                 return -ENOMEM;
1018         }
1019
1020         ret = power_supply_register(bq->dev, &bq->charger);
1021         if (ret) {
1022                 kfree(bq->model);
1023                 return ret;
1024         }
1025
1026         return 0;
1027 }
1028
1029 static void bq2415x_power_supply_exit(struct bq2415x_device *bq)
1030 {
1031         bq->autotimer = 0;
1032         if (bq->automode > 0)
1033                 bq->automode = 0;
1034         cancel_delayed_work_sync(&bq->work);
1035         power_supply_unregister(&bq->charger);
1036         kfree(bq->model);
1037 }
1038
1039 /**** additional sysfs entries for power supply interface ****/
1040
1041 /* show *_status entries */
1042 static ssize_t bq2415x_sysfs_show_status(struct device *dev,
1043                                          struct device_attribute *attr,
1044                                          char *buf)
1045 {
1046         struct power_supply *psy = dev_get_drvdata(dev);
1047         struct bq2415x_device *bq = container_of(psy, struct bq2415x_device,
1048                                                 charger);
1049         enum bq2415x_command command;
1050         int ret;
1051
1052         if (strcmp(attr->attr.name, "otg_status") == 0)
1053                 command = BQ2415X_OTG_STATUS;
1054         else if (strcmp(attr->attr.name, "charge_status") == 0)
1055                 command = BQ2415X_CHARGE_STATUS;
1056         else if (strcmp(attr->attr.name, "boost_status") == 0)
1057                 command = BQ2415X_BOOST_STATUS;
1058         else if (strcmp(attr->attr.name, "fault_status") == 0)
1059                 command = BQ2415X_FAULT_STATUS;
1060         else
1061                 return -EINVAL;
1062
1063         ret = bq2415x_exec_command(bq, command);
1064         if (ret < 0)
1065                 return ret;
1066         return sprintf(buf, "%d\n", ret);
1067 }
1068
1069 /*
1070  * set timer entry:
1071  *    auto - enable auto mode
1072  *    off - disable auto mode
1073  *    (other values) - reset chip timer
1074  */
1075 static ssize_t bq2415x_sysfs_set_timer(struct device *dev,
1076                                        struct device_attribute *attr,
1077                                        const char *buf,
1078                                        size_t count)
1079 {
1080         struct power_supply *psy = dev_get_drvdata(dev);
1081         struct bq2415x_device *bq = container_of(psy, struct bq2415x_device,
1082                                                 charger);
1083         int ret = 0;
1084
1085         if (strncmp(buf, "auto", 4) == 0)
1086                 bq2415x_set_autotimer(bq, 1);
1087         else if (strncmp(buf, "off", 3) == 0)
1088                 bq2415x_set_autotimer(bq, 0);
1089         else
1090                 ret = bq2415x_exec_command(bq, BQ2415X_TIMER_RESET);
1091
1092         if (ret < 0)
1093                 return ret;
1094         return count;
1095 }
1096
1097 /* show timer entry (auto or off) */
1098 static ssize_t bq2415x_sysfs_show_timer(struct device *dev,
1099                                         struct device_attribute *attr,
1100                                         char *buf)
1101 {
1102         struct power_supply *psy = dev_get_drvdata(dev);
1103         struct bq2415x_device *bq = container_of(psy, struct bq2415x_device,
1104                                                  charger);
1105
1106         if (bq->timer_error)
1107                 return sprintf(buf, "%s\n", bq->timer_error);
1108
1109         if (bq->autotimer)
1110                 return sprintf(buf, "auto\n");
1111         return sprintf(buf, "off\n");
1112 }
1113
1114 /*
1115  * set mode entry:
1116  *    auto - if automode is supported, enable it and set mode to reported
1117  *    none - disable charger and boost mode
1118  *    host - charging mode for host/hub chargers (current limit 500mA)
1119  *    dedicated - charging mode for dedicated chargers (unlimited current limit)
1120  *    boost - disable charger and enable boost mode
1121  */
1122 static ssize_t bq2415x_sysfs_set_mode(struct device *dev,
1123                                       struct device_attribute *attr,
1124                                       const char *buf,
1125                                       size_t count)
1126 {
1127         struct power_supply *psy = dev_get_drvdata(dev);
1128         struct bq2415x_device *bq = container_of(psy, struct bq2415x_device,
1129                                                  charger);
1130         enum bq2415x_mode mode;
1131         int ret = 0;
1132
1133         if (strncmp(buf, "auto", 4) == 0) {
1134                 if (bq->automode < 0)
1135                         return -ENOSYS;
1136                 bq->automode = 1;
1137                 mode = bq->reported_mode;
1138         } else if (strncmp(buf, "none", 4) == 0) {
1139                 if (bq->automode > 0)
1140                         bq->automode = 0;
1141                 mode = BQ2415X_MODE_NONE;
1142         } else if (strncmp(buf, "host", 4) == 0) {
1143                 if (bq->automode > 0)
1144                         bq->automode = 0;
1145                 mode = BQ2415X_MODE_HOST_CHARGER;
1146         } else if (strncmp(buf, "dedicated", 9) == 0) {
1147                 if (bq->automode > 0)
1148                         bq->automode = 0;
1149                 mode = BQ2415X_MODE_DEDICATED_CHARGER;
1150         } else if (strncmp(buf, "boost", 5) == 0) {
1151                 if (bq->automode > 0)
1152                         bq->automode = 0;
1153                 mode = BQ2415X_MODE_BOOST;
1154         } else if (strncmp(buf, "reset", 5) == 0) {
1155                 bq2415x_reset_chip(bq);
1156                 bq2415x_set_defaults(bq);
1157                 if (bq->automode <= 0)
1158                         return count;
1159                 bq->automode = 1;
1160                 mode = bq->reported_mode;
1161         } else {
1162                 return -EINVAL;
1163         }
1164
1165         ret = bq2415x_set_mode(bq, mode);
1166         if (ret < 0)
1167                 return ret;
1168         return count;
1169 }
1170
1171 /* show mode entry (auto, none, host, dedicated or boost) */
1172 static ssize_t bq2415x_sysfs_show_mode(struct device *dev,
1173                                        struct device_attribute *attr,
1174                                        char *buf)
1175 {
1176         struct power_supply *psy = dev_get_drvdata(dev);
1177         struct bq2415x_device *bq = container_of(psy, struct bq2415x_device,
1178                                                 charger);
1179         ssize_t ret = 0;
1180
1181         if (bq->automode > 0)
1182                 ret += sprintf(buf+ret, "auto (");
1183
1184         switch (bq->mode) {
1185         case BQ2415X_MODE_NONE:
1186                 ret += sprintf(buf+ret, "none");
1187                 break;
1188         case BQ2415X_MODE_HOST_CHARGER:
1189                 ret += sprintf(buf+ret, "host");
1190                 break;
1191         case BQ2415X_MODE_DEDICATED_CHARGER:
1192                 ret += sprintf(buf+ret, "dedicated");
1193                 break;
1194         case BQ2415X_MODE_BOOST:
1195                 ret += sprintf(buf+ret, "boost");
1196                 break;
1197         }
1198
1199         if (bq->automode > 0)
1200                 ret += sprintf(buf+ret, ")");
1201
1202         ret += sprintf(buf+ret, "\n");
1203         return ret;
1204 }
1205
1206 /* show reported_mode entry (none, host, dedicated or boost) */
1207 static ssize_t bq2415x_sysfs_show_reported_mode(struct device *dev,
1208                                                 struct device_attribute *attr,
1209                                                 char *buf)
1210 {
1211         struct power_supply *psy = dev_get_drvdata(dev);
1212         struct bq2415x_device *bq = container_of(psy, struct bq2415x_device,
1213                                                  charger);
1214
1215         if (bq->automode < 0)
1216                 return -EINVAL;
1217
1218         switch (bq->reported_mode) {
1219         case BQ2415X_MODE_NONE:
1220                 return sprintf(buf, "none\n");
1221         case BQ2415X_MODE_HOST_CHARGER:
1222                 return sprintf(buf, "host\n");
1223         case BQ2415X_MODE_DEDICATED_CHARGER:
1224                 return sprintf(buf, "dedicated\n");
1225         case BQ2415X_MODE_BOOST:
1226                 return sprintf(buf, "boost\n");
1227         }
1228
1229         return -EINVAL;
1230 }
1231
1232 /* directly set raw value to chip register, format: 'register value' */
1233 static ssize_t bq2415x_sysfs_set_registers(struct device *dev,
1234                                            struct device_attribute *attr,
1235                                            const char *buf,
1236                                            size_t count)
1237 {
1238         struct power_supply *psy = dev_get_drvdata(dev);
1239         struct bq2415x_device *bq = container_of(psy, struct bq2415x_device,
1240                                                  charger);
1241         ssize_t ret = 0;
1242         unsigned int reg;
1243         unsigned int val;
1244
1245         if (sscanf(buf, "%x %x", &reg, &val) != 2)
1246                 return -EINVAL;
1247
1248         if (reg > 4 || val > 255)
1249                 return -EINVAL;
1250
1251         ret = bq2415x_i2c_write(bq, reg, val);
1252         if (ret < 0)
1253                 return ret;
1254         return count;
1255 }
1256
1257 /* print value of chip register, format: 'register=value' */
1258 static ssize_t bq2415x_sysfs_print_reg(struct bq2415x_device *bq,
1259                                        u8 reg,
1260                                        char *buf)
1261 {
1262         int ret = bq2415x_i2c_read(bq, reg);
1263
1264         if (ret < 0)
1265                 return sprintf(buf, "%#.2x=error %d\n", reg, ret);
1266         return sprintf(buf, "%#.2x=%#.2x\n", reg, ret);
1267 }
1268
1269 /* show all raw values of chip register, format per line: 'register=value' */
1270 static ssize_t bq2415x_sysfs_show_registers(struct device *dev,
1271                                             struct device_attribute *attr,
1272                                             char *buf)
1273 {
1274         struct power_supply *psy = dev_get_drvdata(dev);
1275         struct bq2415x_device *bq = container_of(psy, struct bq2415x_device,
1276                                                  charger);
1277         ssize_t ret = 0;
1278
1279         ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_STATUS, buf+ret);
1280         ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_CONTROL, buf+ret);
1281         ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_VOLTAGE, buf+ret);
1282         ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_VENDER, buf+ret);
1283         ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_CURRENT, buf+ret);
1284         return ret;
1285 }
1286
1287 /* set current and voltage limit entries (in mA or mV) */
1288 static ssize_t bq2415x_sysfs_set_limit(struct device *dev,
1289                                        struct device_attribute *attr,
1290                                        const char *buf,
1291                                        size_t count)
1292 {
1293         struct power_supply *psy = dev_get_drvdata(dev);
1294         struct bq2415x_device *bq = container_of(psy, struct bq2415x_device,
1295                                                  charger);
1296         long val;
1297         int ret;
1298
1299         if (kstrtol(buf, 10, &val) < 0)
1300                 return -EINVAL;
1301
1302         if (strcmp(attr->attr.name, "current_limit") == 0)
1303                 ret = bq2415x_set_current_limit(bq, val);
1304         else if (strcmp(attr->attr.name, "weak_battery_voltage") == 0)
1305                 ret = bq2415x_set_weak_battery_voltage(bq, val);
1306         else if (strcmp(attr->attr.name, "battery_regulation_voltage") == 0)
1307                 ret = bq2415x_set_battery_regulation_voltage(bq, val);
1308         else if (strcmp(attr->attr.name, "charge_current") == 0)
1309                 ret = bq2415x_set_charge_current(bq, val);
1310         else if (strcmp(attr->attr.name, "termination_current") == 0)
1311                 ret = bq2415x_set_termination_current(bq, val);
1312         else
1313                 return -EINVAL;
1314
1315         if (ret < 0)
1316                 return ret;
1317         return count;
1318 }
1319
1320 /* show current and voltage limit entries (in mA or mV) */
1321 static ssize_t bq2415x_sysfs_show_limit(struct device *dev,
1322                                         struct device_attribute *attr,
1323                                         char *buf)
1324 {
1325         struct power_supply *psy = dev_get_drvdata(dev);
1326         struct bq2415x_device *bq = container_of(psy, struct bq2415x_device,
1327                                                  charger);
1328         int ret;
1329
1330         if (strcmp(attr->attr.name, "current_limit") == 0)
1331                 ret = bq2415x_get_current_limit(bq);
1332         else if (strcmp(attr->attr.name, "weak_battery_voltage") == 0)
1333                 ret = bq2415x_get_weak_battery_voltage(bq);
1334         else if (strcmp(attr->attr.name, "battery_regulation_voltage") == 0)
1335                 ret = bq2415x_get_battery_regulation_voltage(bq);
1336         else if (strcmp(attr->attr.name, "charge_current") == 0)
1337                 ret = bq2415x_get_charge_current(bq);
1338         else if (strcmp(attr->attr.name, "termination_current") == 0)
1339                 ret = bq2415x_get_termination_current(bq);
1340         else
1341                 return -EINVAL;
1342
1343         if (ret < 0)
1344                 return ret;
1345         return sprintf(buf, "%d\n", ret);
1346 }
1347
1348 /* set *_enable entries */
1349 static ssize_t bq2415x_sysfs_set_enable(struct device *dev,
1350                                         struct device_attribute *attr,
1351                                         const char *buf,
1352                                         size_t count)
1353 {
1354         struct power_supply *psy = dev_get_drvdata(dev);
1355         struct bq2415x_device *bq = container_of(psy, struct bq2415x_device,
1356                                                  charger);
1357         enum bq2415x_command command;
1358         long val;
1359         int ret;
1360
1361         if (kstrtol(buf, 10, &val) < 0)
1362                 return -EINVAL;
1363
1364         if (strcmp(attr->attr.name, "charge_termination_enable") == 0)
1365                 command = val ? BQ2415X_CHARGE_TERMINATION_ENABLE :
1366                         BQ2415X_CHARGE_TERMINATION_DISABLE;
1367         else if (strcmp(attr->attr.name, "high_impedance_enable") == 0)
1368                 command = val ? BQ2415X_HIGH_IMPEDANCE_ENABLE :
1369                         BQ2415X_HIGH_IMPEDANCE_DISABLE;
1370         else if (strcmp(attr->attr.name, "otg_pin_enable") == 0)
1371                 command = val ? BQ2415X_OTG_PIN_ENABLE :
1372                         BQ2415X_OTG_PIN_DISABLE;
1373         else if (strcmp(attr->attr.name, "stat_pin_enable") == 0)
1374                 command = val ? BQ2415X_STAT_PIN_ENABLE :
1375                         BQ2415X_STAT_PIN_DISABLE;
1376         else
1377                 return -EINVAL;
1378
1379         ret = bq2415x_exec_command(bq, command);
1380         if (ret < 0)
1381                 return ret;
1382         return count;
1383 }
1384
1385 /* show *_enable entries */
1386 static ssize_t bq2415x_sysfs_show_enable(struct device *dev,
1387                                          struct device_attribute *attr,
1388                                          char *buf)
1389 {
1390         struct power_supply *psy = dev_get_drvdata(dev);
1391         struct bq2415x_device *bq = container_of(psy, struct bq2415x_device,
1392                                                  charger);
1393         enum bq2415x_command command;
1394         int ret;
1395
1396         if (strcmp(attr->attr.name, "charge_termination_enable") == 0)
1397                 command = BQ2415X_CHARGE_TERMINATION_STATUS;
1398         else if (strcmp(attr->attr.name, "high_impedance_enable") == 0)
1399                 command = BQ2415X_HIGH_IMPEDANCE_STATUS;
1400         else if (strcmp(attr->attr.name, "otg_pin_enable") == 0)
1401                 command = BQ2415X_OTG_PIN_STATUS;
1402         else if (strcmp(attr->attr.name, "stat_pin_enable") == 0)
1403                 command = BQ2415X_STAT_PIN_STATUS;
1404         else
1405                 return -EINVAL;
1406
1407         ret = bq2415x_exec_command(bq, command);
1408         if (ret < 0)
1409                 return ret;
1410         return sprintf(buf, "%d\n", ret);
1411 }
1412
1413 static DEVICE_ATTR(current_limit, S_IWUSR | S_IRUGO,
1414                 bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit);
1415 static DEVICE_ATTR(weak_battery_voltage, S_IWUSR | S_IRUGO,
1416                 bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit);
1417 static DEVICE_ATTR(battery_regulation_voltage, S_IWUSR | S_IRUGO,
1418                 bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit);
1419 static DEVICE_ATTR(charge_current, S_IWUSR | S_IRUGO,
1420                 bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit);
1421 static DEVICE_ATTR(termination_current, S_IWUSR | S_IRUGO,
1422                 bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit);
1423
1424 static DEVICE_ATTR(charge_termination_enable, S_IWUSR | S_IRUGO,
1425                 bq2415x_sysfs_show_enable, bq2415x_sysfs_set_enable);
1426 static DEVICE_ATTR(high_impedance_enable, S_IWUSR | S_IRUGO,
1427                 bq2415x_sysfs_show_enable, bq2415x_sysfs_set_enable);
1428 static DEVICE_ATTR(otg_pin_enable, S_IWUSR | S_IRUGO,
1429                 bq2415x_sysfs_show_enable, bq2415x_sysfs_set_enable);
1430 static DEVICE_ATTR(stat_pin_enable, S_IWUSR | S_IRUGO,
1431                 bq2415x_sysfs_show_enable, bq2415x_sysfs_set_enable);
1432
1433 static DEVICE_ATTR(reported_mode, S_IRUGO,
1434                 bq2415x_sysfs_show_reported_mode, NULL);
1435 static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO,
1436                 bq2415x_sysfs_show_mode, bq2415x_sysfs_set_mode);
1437 static DEVICE_ATTR(timer, S_IWUSR | S_IRUGO,
1438                 bq2415x_sysfs_show_timer, bq2415x_sysfs_set_timer);
1439
1440 static DEVICE_ATTR(registers, S_IWUSR | S_IRUGO,
1441                 bq2415x_sysfs_show_registers, bq2415x_sysfs_set_registers);
1442
1443 static DEVICE_ATTR(otg_status, S_IRUGO, bq2415x_sysfs_show_status, NULL);
1444 static DEVICE_ATTR(charge_status, S_IRUGO, bq2415x_sysfs_show_status, NULL);
1445 static DEVICE_ATTR(boost_status, S_IRUGO, bq2415x_sysfs_show_status, NULL);
1446 static DEVICE_ATTR(fault_status, S_IRUGO, bq2415x_sysfs_show_status, NULL);
1447
1448 static struct attribute *bq2415x_sysfs_attributes[] = {
1449         /*
1450          * TODO: some (appropriate) of these attrs should be switched to
1451          * use power supply class props.
1452          */
1453         &dev_attr_current_limit.attr,
1454         &dev_attr_weak_battery_voltage.attr,
1455         &dev_attr_battery_regulation_voltage.attr,
1456         &dev_attr_charge_current.attr,
1457         &dev_attr_termination_current.attr,
1458
1459         &dev_attr_charge_termination_enable.attr,
1460         &dev_attr_high_impedance_enable.attr,
1461         &dev_attr_otg_pin_enable.attr,
1462         &dev_attr_stat_pin_enable.attr,
1463
1464         &dev_attr_reported_mode.attr,
1465         &dev_attr_mode.attr,
1466         &dev_attr_timer.attr,
1467
1468         &dev_attr_registers.attr,
1469
1470         &dev_attr_otg_status.attr,
1471         &dev_attr_charge_status.attr,
1472         &dev_attr_boost_status.attr,
1473         &dev_attr_fault_status.attr,
1474         NULL,
1475 };
1476
1477 static const struct attribute_group bq2415x_sysfs_attr_group = {
1478         .attrs = bq2415x_sysfs_attributes,
1479 };
1480
1481 static int bq2415x_sysfs_init(struct bq2415x_device *bq)
1482 {
1483         return sysfs_create_group(&bq->charger.dev->kobj,
1484                         &bq2415x_sysfs_attr_group);
1485 }
1486
1487 static void bq2415x_sysfs_exit(struct bq2415x_device *bq)
1488 {
1489         sysfs_remove_group(&bq->charger.dev->kobj, &bq2415x_sysfs_attr_group);
1490 }
1491
1492 /* main bq2415x probe function */
1493 static int bq2415x_probe(struct i2c_client *client,
1494                          const struct i2c_device_id *id)
1495 {
1496         int ret;
1497         int num;
1498         char *name;
1499         struct bq2415x_device *bq;
1500
1501         if (!client->dev.platform_data) {
1502                 dev_err(&client->dev, "platform data not set\n");
1503                 return -ENODEV;
1504         }
1505
1506         /* Get new ID for the new device */
1507         ret = idr_pre_get(&bq2415x_id, GFP_KERNEL);
1508         if (ret == 0)
1509                 return -ENOMEM;
1510
1511         mutex_lock(&bq2415x_id_mutex);
1512         ret = idr_get_new(&bq2415x_id, client, &num);
1513         mutex_unlock(&bq2415x_id_mutex);
1514
1515         if (ret < 0)
1516                 return ret;
1517
1518         name = kasprintf(GFP_KERNEL, "%s-%d", id->name, num);
1519         if (!name) {
1520                 dev_err(&client->dev, "failed to allocate device name\n");
1521                 ret = -ENOMEM;
1522                 goto error_1;
1523         }
1524
1525         bq = kzalloc(sizeof(*bq), GFP_KERNEL);
1526         if (!bq) {
1527                 dev_err(&client->dev, "failed to allocate device data\n");
1528                 ret = -ENOMEM;
1529                 goto error_2;
1530         }
1531
1532         i2c_set_clientdata(client, bq);
1533
1534         bq->id = num;
1535         bq->dev = &client->dev;
1536         bq->chip = id->driver_data;
1537         bq->name = name;
1538         bq->mode = BQ2415X_MODE_NONE;
1539         bq->reported_mode = BQ2415X_MODE_NONE;
1540         bq->autotimer = 0;
1541         bq->automode = 0;
1542
1543         memcpy(&bq->init_data, client->dev.platform_data,
1544                         sizeof(bq->init_data));
1545
1546         bq2415x_reset_chip(bq);
1547
1548         ret = bq2415x_power_supply_init(bq);
1549         if (ret) {
1550                 dev_err(bq->dev, "failed to register power supply: %d\n", ret);
1551                 goto error_3;
1552         }
1553
1554         ret = bq2415x_sysfs_init(bq);
1555         if (ret) {
1556                 dev_err(bq->dev, "failed to create sysfs entries: %d\n", ret);
1557                 goto error_4;
1558         }
1559
1560         ret = bq2415x_set_defaults(bq);
1561         if (ret) {
1562                 dev_err(bq->dev, "failed to set default values: %d\n", ret);
1563                 goto error_5;
1564         }
1565
1566         if (bq->init_data.set_mode_hook) {
1567                 if (bq->init_data.set_mode_hook(
1568                                 bq2415x_hook_function, bq)) {
1569                         bq->automode = 1;
1570                         bq2415x_set_mode(bq, bq->reported_mode);
1571                         dev_info(bq->dev, "automode enabled\n");
1572                 } else {
1573                         bq->automode = -1;
1574                         dev_info(bq->dev, "automode failed\n");
1575                 }
1576         } else {
1577                 bq->automode = -1;
1578                 dev_info(bq->dev, "automode not supported\n");
1579         }
1580
1581         INIT_DELAYED_WORK(&bq->work, bq2415x_timer_work);
1582         bq2415x_set_autotimer(bq, 1);
1583
1584         dev_info(bq->dev, "driver registered\n");
1585         return 0;
1586
1587 error_5:
1588         bq2415x_sysfs_exit(bq);
1589 error_4:
1590         bq2415x_power_supply_exit(bq);
1591 error_3:
1592         kfree(bq);
1593 error_2:
1594         kfree(name);
1595 error_1:
1596         mutex_lock(&bq2415x_id_mutex);
1597         idr_remove(&bq2415x_id, num);
1598         mutex_unlock(&bq2415x_id_mutex);
1599
1600         return ret;
1601 }
1602
1603 /* main bq2415x remove function */
1604
1605 static int bq2415x_remove(struct i2c_client *client)
1606 {
1607         struct bq2415x_device *bq = i2c_get_clientdata(client);
1608
1609         if (bq->init_data.set_mode_hook)
1610                 bq->init_data.set_mode_hook(NULL, NULL);
1611
1612         bq2415x_sysfs_exit(bq);
1613         bq2415x_power_supply_exit(bq);
1614
1615         bq2415x_reset_chip(bq);
1616
1617         mutex_lock(&bq2415x_id_mutex);
1618         idr_remove(&bq2415x_id, bq->id);
1619         mutex_unlock(&bq2415x_id_mutex);
1620
1621         dev_info(bq->dev, "driver unregistered\n");
1622
1623         kfree(bq->name);
1624         kfree(bq);
1625
1626         return 0;
1627 }
1628
1629 static const struct i2c_device_id bq2415x_i2c_id_table[] = {
1630         { "bq2415x", BQUNKNOWN },
1631         { "bq24150", BQ24150 },
1632         { "bq24150a", BQ24150A },
1633         { "bq24151", BQ24151 },
1634         { "bq24151a", BQ24151A },
1635         { "bq24152", BQ24152 },
1636         { "bq24153", BQ24153 },
1637         { "bq24153a", BQ24153A },
1638         { "bq24155", BQ24155 },
1639         { "bq24156", BQ24156 },
1640         { "bq24156a", BQ24156A },
1641         { "bq24158", BQ24158 },
1642         {},
1643 };
1644 MODULE_DEVICE_TABLE(i2c, bq2415x_i2c_id_table);
1645
1646 static struct i2c_driver bq2415x_driver = {
1647         .driver = {
1648                 .name = "bq2415x-charger",
1649         },
1650         .probe = bq2415x_probe,
1651         .remove = bq2415x_remove,
1652         .id_table = bq2415x_i2c_id_table,
1653 };
1654 module_i2c_driver(bq2415x_driver);
1655
1656 MODULE_AUTHOR("Pali Rohár <pali.rohar@gmail.com>");
1657 MODULE_DESCRIPTION("bq2415x charger driver");
1658 MODULE_LICENSE("GPL");