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         /*
 609          * According to datasheet, maximum battery regulation voltage is
 610          * 4440mV which is b101111 = 47.
 611          */
 612         if (val < 0)
 613                 val = 0;
 614         else if (val > 47)
 615                 return -EINVAL;
 616
 617         return bq2415x_i2c_write_mask(bq, BQ2415X_REG_VOLTAGE, val,
 618                         BQ2415X_MASK_VO, BQ2415X_SHIFT_VO);
 619 }
 620
 621 /* get battery regulation voltage in mV */
 622 static int bq2415x_get_battery_regulation_voltage(struct bq2415x_device *bq)
 623 {
 624         int ret = bq2415x_i2c_read_mask(bq, BQ2415X_REG_VOLTAGE,
 625                         BQ2415X_MASK_VO, BQ2415X_SHIFT_VO);
 626
 627         if (ret < 0)
 628                 return ret;
 629         return 10 * (350 + 2*ret);
 630 }
 631
 632 /* set charge current in mA (platform data must provide resistor sense) */
 633 static int bq2415x_set_charge_current(struct bq2415x_device *bq, int mA)
 634 {
 635         int val;
 636
 637         if (bq->init_data.resistor_sense <= 0)
 638                 return -ENOSYS;
 639
 640         val = (mA * bq->init_data.resistor_sense - 37400) / 6800;
 641         if (val < 0)
 642                 val = 0;
 643         else if (val > 7)
 644                 val = 7;
 645
 646         return bq2415x_i2c_write_mask(bq, BQ2415X_REG_CURRENT, val,
 647                         BQ2415X_MASK_VI_CHRG | BQ2415X_MASK_RESET,
 648                         BQ2415X_SHIFT_VI_CHRG);
 649 }
 650
 651 /* get charge current in mA (platform data must provide resistor sense) */
 652 static int bq2415x_get_charge_current(struct bq2415x_device *bq)
 653 {
 654         int ret;
 655
 656         if (bq->init_data.resistor_sense <= 0)
 657                 return -ENOSYS;
 658
 659         ret = bq2415x_i2c_read_mask(bq, BQ2415X_REG_CURRENT,
 660                         BQ2415X_MASK_VI_CHRG, BQ2415X_SHIFT_VI_CHRG);
 661         if (ret < 0)
 662                 return ret;
 663         return (37400 + 6800*ret) / bq->init_data.resistor_sense;
 664 }
 665
 666 /* set termination current in mA (platform data must provide resistor sense) */
 667 static int bq2415x_set_termination_current(struct bq2415x_device *bq, int mA)
 668 {
 669         int val;
 670
 671         if (bq->init_data.resistor_sense <= 0)
 672                 return -ENOSYS;
 673
 674         val = (mA * bq->init_data.resistor_sense - 3400) / 3400;
 675         if (val < 0)
 676                 val = 0;
 677         else if (val > 7)
 678                 val = 7;
 679
 680         return bq2415x_i2c_write_mask(bq, BQ2415X_REG_CURRENT, val,
 681                         BQ2415X_MASK_VI_TERM | BQ2415X_MASK_RESET,
 682                         BQ2415X_SHIFT_VI_TERM);
 683 }
 684
 685 /* get termination current in mA (platform data must provide resistor sense) */
 686 static int bq2415x_get_termination_current(struct bq2415x_device *bq)
 687 {
 688         int ret;
 689
 690         if (bq->init_data.resistor_sense <= 0)
 691                 return -ENOSYS;
 692
 693         ret = bq2415x_i2c_read_mask(bq, BQ2415X_REG_CURRENT,
 694                         BQ2415X_MASK_VI_TERM, BQ2415X_SHIFT_VI_TERM);
 695         if (ret < 0)
 696                 return ret;
 697         return (3400 + 3400*ret) / bq->init_data.resistor_sense;
 698 }
 699
 700 /* set default value of property */
 701 #define bq2415x_set_default_value(bq, prop) \
 702         do { \
 703                 int ret = 0; \
 704                 if (bq->init_data.prop != -1) \
 705                         ret = bq2415x_set_##prop(bq, bq->init_data.prop); \
 706                 if (ret < 0) \
 707                         return ret; \
 708         } while (0)
 709
 710 /* set default values of all properties */
 711 static int bq2415x_set_defaults(struct bq2415x_device *bq)
 712 {
 713         bq2415x_exec_command(bq, BQ2415X_BOOST_MODE_DISABLE);
 714         bq2415x_exec_command(bq, BQ2415X_CHARGER_DISABLE);
 715         bq2415x_exec_command(bq, BQ2415X_CHARGE_TERMINATION_DISABLE);
 716
 717         bq2415x_set_default_value(bq, current_limit);
 718         bq2415x_set_default_value(bq, weak_battery_voltage);
 719         bq2415x_set_default_value(bq, battery_regulation_voltage);
 720
 721         if (bq->init_data.resistor_sense > 0) {
 722                 bq2415x_set_default_value(bq, charge_current);
 723                 bq2415x_set_default_value(bq, termination_current);
 724                 bq2415x_exec_command(bq, BQ2415X_CHARGE_TERMINATION_ENABLE);
 725         }
 726
 727         bq2415x_exec_command(bq, BQ2415X_CHARGER_ENABLE);
 728         return 0;
 729 }
 730
 731 /**** charger mode functions ****/
 732
 733 /* set charger mode */
 734 static int bq2415x_set_mode(struct bq2415x_device *bq, enum bq2415x_mode mode)
 735 {
 736         int ret = 0;
 737         int charger = 0;
 738         int boost = 0;
 739
 740         if (mode == BQ2415X_MODE_BOOST)
 741                 boost = 1;
 742         else if (mode != BQ2415X_MODE_OFF)
 743                 charger = 1;
 744
 745         if (!charger)
 746                 ret = bq2415x_exec_command(bq, BQ2415X_CHARGER_DISABLE);
 747
 748         if (!boost)
 749                 ret = bq2415x_exec_command(bq, BQ2415X_BOOST_MODE_DISABLE);
 750
 751         if (ret < 0)
 752                 return ret;
 753
 754         switch (mode) {
 755         case BQ2415X_MODE_OFF:
 756                 dev_dbg(bq->dev, "changing mode to: Offline\n");
 757                 ret = bq2415x_set_current_limit(bq, 100);
 758                 break;
 759         case BQ2415X_MODE_NONE:
 760                 dev_dbg(bq->dev, "changing mode to: N/A\n");
 761                 ret = bq2415x_set_current_limit(bq, 100);
 762                 break;
 763         case BQ2415X_MODE_HOST_CHARGER:
 764                 dev_dbg(bq->dev, "changing mode to: Host/HUB charger\n");
 765                 ret = bq2415x_set_current_limit(bq, 500);
 766                 break;
 767         case BQ2415X_MODE_DEDICATED_CHARGER:
 768                 dev_dbg(bq->dev, "changing mode to: Dedicated charger\n");
 769                 ret = bq2415x_set_current_limit(bq, 1800);
 770                 break;
 771         case BQ2415X_MODE_BOOST: /* Boost mode */
 772                 dev_dbg(bq->dev, "changing mode to: Boost\n");
 773                 ret = bq2415x_set_current_limit(bq, 100);
 774                 break;
 775         }
 776
 777         if (ret < 0)
 778                 return ret;
 779
 780         if (charger)
 781                 ret = bq2415x_exec_command(bq, BQ2415X_CHARGER_ENABLE);
 782         else if (boost)
 783                 ret = bq2415x_exec_command(bq, BQ2415X_BOOST_MODE_ENABLE);
 784
 785         if (ret < 0)
 786                 return ret;
 787
 788         bq2415x_set_default_value(bq, weak_battery_voltage);
 789         bq2415x_set_default_value(bq, battery_regulation_voltage);
 790
 791         bq->mode = mode;
 792         sysfs_notify(&bq->charger.dev->kobj, NULL, "mode");
 793
 794         return 0;
 795
 796 }
 797
 798 /* hook function called by other driver which set reported mode */
 799 static void bq2415x_hook_function(enum bq2415x_mode mode, void *data)
 800 {
 801         struct bq2415x_device *bq = data;
 802
 803         if (!bq)
 804                 return;
 805
 806         dev_dbg(bq->dev, "hook function was called\n");
 807         bq->reported_mode = mode;
 808
 809         /* if automode is not enabled do not tell about reported_mode */
 810         if (bq->automode < 1)
 811                 return;
 812
 813         sysfs_notify(&bq->charger.dev->kobj, NULL, "reported_mode");
 814         bq2415x_set_mode(bq, bq->reported_mode);
 815
 816 }
 817
 818 /**** timer functions ****/
 819
 820 /* enable/disable auto resetting chip timer */
 821 static void bq2415x_set_autotimer(struct bq2415x_device *bq, int state)
 822 {
 823         mutex_lock(&bq2415x_timer_mutex);
 824
 825         if (bq->autotimer == state) {
 826                 mutex_unlock(&bq2415x_timer_mutex);
 827                 return;
 828         }
 829
 830         bq->autotimer = state;
 831
 832         if (state) {
 833                 schedule_delayed_work(&bq->work, BQ2415X_TIMER_TIMEOUT * HZ);
 834                 bq2415x_exec_command(bq, BQ2415X_TIMER_RESET);
 835                 bq->timer_error = NULL;
 836         } else {
 837                 cancel_delayed_work_sync(&bq->work);
 838         }
 839
 840         mutex_unlock(&bq2415x_timer_mutex);
 841 }
 842
 843 /* called by bq2415x_timer_work on timer error */
 844 static void bq2415x_timer_error(struct bq2415x_device *bq, const char *msg)
 845 {
 846         bq->timer_error = msg;
 847         sysfs_notify(&bq->charger.dev->kobj, NULL, "timer");
 848         dev_err(bq->dev, "%s\n", msg);
 849         if (bq->automode > 0)
 850                 bq->automode = 0;
 851         bq2415x_set_mode(bq, BQ2415X_MODE_OFF);
 852         bq2415x_set_autotimer(bq, 0);
 853 }
 854
 855 /* delayed work function for auto resetting chip timer */
 856 static void bq2415x_timer_work(struct work_struct *work)
 857 {
 858         struct bq2415x_device *bq = container_of(work, struct bq2415x_device,
 859                                                  work.work);
 860         int ret;
 861         int error;
 862         int boost;
 863
 864         if (!bq->autotimer)
 865                 return;
 866
 867         ret = bq2415x_exec_command(bq, BQ2415X_TIMER_RESET);
 868         if (ret < 0) {
 869                 bq2415x_timer_error(bq, "Resetting timer failed");
 870                 return;
 871         }
 872
 873         boost = bq2415x_exec_command(bq, BQ2415X_BOOST_MODE_STATUS);
 874         if (boost < 0) {
 875                 bq2415x_timer_error(bq, "Unknown error");
 876                 return;
 877         }
 878
 879         error = bq2415x_exec_command(bq, BQ2415X_FAULT_STATUS);
 880         if (error < 0) {
 881                 bq2415x_timer_error(bq, "Unknown error");
 882                 return;
 883         }
 884
 885         if (boost) {
 886                 switch (error) {
 887                 /* Non fatal errors, chip is OK */
 888                 case 0: /* No error */
 889                         break;
 890                 case 6: /* Timer expired */
 891                         dev_err(bq->dev, "Timer expired\n");
 892                         break;
 893                 case 3: /* Battery voltage too low */
 894                         dev_err(bq->dev, "Battery voltage to low\n");
 895                         break;
 896
 897                 /* Fatal errors, disable and reset chip */
 898                 case 1: /* Overvoltage protection (chip fried) */
 899                         bq2415x_timer_error(bq,
 900                                 "Overvoltage protection (chip fried)");
 901                         return;
 902                 case 2: /* Overload */
 903                         bq2415x_timer_error(bq, "Overload");
 904                         return;
 905                 case 4: /* Battery overvoltage protection */
 906                         bq2415x_timer_error(bq,
 907                                 "Battery overvoltage protection");
 908                         return;
 909                 case 5: /* Thermal shutdown (too hot) */
 910                         bq2415x_timer_error(bq,
 911                                         "Thermal shutdown (too hot)");
 912                         return;
 913                 case 7: /* N/A */
 914                         bq2415x_timer_error(bq, "Unknown error");
 915                         return;
 916                 }
 917         } else {
 918                 switch (error) {
 919                 /* Non fatal errors, chip is OK */
 920                 case 0: /* No error */
 921                         break;
 922                 case 2: /* Sleep mode */
 923                         dev_err(bq->dev, "Sleep mode\n");
 924                         break;
 925                 case 3: /* Poor input source */
 926                         dev_err(bq->dev, "Poor input source\n");
 927                         break;
 928                 case 6: /* Timer expired */
 929                         dev_err(bq->dev, "Timer expired\n");
 930                         break;
 931                 case 7: /* No battery */
 932                         dev_err(bq->dev, "No battery\n");
 933                         break;
 934
 935                 /* Fatal errors, disable and reset chip */
 936                 case 1: /* Overvoltage protection (chip fried) */
 937                         bq2415x_timer_error(bq,
 938                                 "Overvoltage protection (chip fried)");
 939                         return;
 940                 case 4: /* Battery overvoltage protection */
 941                         bq2415x_timer_error(bq,
 942                                 "Battery overvoltage protection");
 943                         return;
 944                 case 5: /* Thermal shutdown (too hot) */
 945                         bq2415x_timer_error(bq,
 946                                 "Thermal shutdown (too hot)");
 947                         return;
 948                 }
 949         }
 950
 951         schedule_delayed_work(&bq->work, BQ2415X_TIMER_TIMEOUT * HZ);
 952 }
 953
 954 /**** power supply interface code ****/
 955
 956 static enum power_supply_property bq2415x_power_supply_props[] = {
 957         /* TODO: maybe add more power supply properties */
 958         POWER_SUPPLY_PROP_STATUS,
 959         POWER_SUPPLY_PROP_MODEL_NAME,
 960 };
 961
 962 static int bq2415x_power_supply_get_property(struct power_supply *psy,
 963                                              enum power_supply_property psp,
 964                                              union power_supply_propval *val)
 965 {
 966         struct bq2415x_device *bq = container_of(psy, struct bq2415x_device,
 967                                                  charger);
 968         int ret;
 969
 970         switch (psp) {
 971         case POWER_SUPPLY_PROP_STATUS:
 972                 ret = bq2415x_exec_command(bq, BQ2415X_CHARGE_STATUS);
 973                 if (ret < 0)
 974                         return ret;
 975                 else if (ret == 0) /* Ready */
 976                         val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
 977                 else if (ret == 1) /* Charge in progress */
 978                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
 979                 else if (ret == 2) /* Charge done */
 980                         val->intval = POWER_SUPPLY_STATUS_FULL;
 981                 else
 982                         val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
 983                 break;
 984         case POWER_SUPPLY_PROP_MODEL_NAME:
 985                 val->strval = bq->model;
 986                 break;
 987         default:
 988                 return -EINVAL;
 989         }
 990         return 0;
 991 }
 992
 993 static int bq2415x_power_supply_init(struct bq2415x_device *bq)
 994 {
 995         int ret;
 996         int chip;
 997         char revstr[8];
 998
 999         bq->charger.name = bq->name;
1000         bq->charger.type = POWER_SUPPLY_TYPE_USB;
1001         bq->charger.properties = bq2415x_power_supply_props;
1002         bq->charger.num_properties = ARRAY_SIZE(bq2415x_power_supply_props);
1003         bq->charger.get_property = bq2415x_power_supply_get_property;
1004
1005         ret = bq2415x_detect_chip(bq);
1006         if (ret < 0)
1007                 chip = BQUNKNOWN;
1008         else
1009                 chip = ret;
1010
1011         ret = bq2415x_detect_revision(bq);
1012         if (ret < 0)
1013                 strcpy(revstr, "unknown");
1014         else
1015                 sprintf(revstr, "1.%d", ret);
1016
1017         bq->model = kasprintf(GFP_KERNEL,
1018                                 "chip %s, revision %s, vender code %.3d",
1019                                 bq2415x_chip_name[chip], revstr,
1020                                 bq2415x_get_vender_code(bq));
1021         if (!bq->model) {
1022                 dev_err(bq->dev, "failed to allocate model name\n");
1023                 return -ENOMEM;
1024         }
1025
1026         ret = power_supply_register(bq->dev, &bq->charger);
1027         if (ret) {
1028                 kfree(bq->model);
1029                 return ret;
1030         }
1031
1032         return 0;
1033 }
1034
1035 static void bq2415x_power_supply_exit(struct bq2415x_device *bq)
1036 {
1037         bq->autotimer = 0;
1038         if (bq->automode > 0)
1039                 bq->automode = 0;
1040         cancel_delayed_work_sync(&bq->work);
1041         power_supply_unregister(&bq->charger);
1042         kfree(bq->model);
1043 }
1044
1045 /**** additional sysfs entries for power supply interface ****/
1046
1047 /* show *_status entries */
1048 static ssize_t bq2415x_sysfs_show_status(struct device *dev,
1049                                          struct device_attribute *attr,
1050                                          char *buf)
1051 {
1052         struct power_supply *psy = dev_get_drvdata(dev);
1053         struct bq2415x_device *bq = container_of(psy, struct bq2415x_device,
1054                                                 charger);
1055         enum bq2415x_command command;
1056         int ret;
1057
1058         if (strcmp(attr->attr.name, "otg_status") == 0)
1059                 command = BQ2415X_OTG_STATUS;
1060         else if (strcmp(attr->attr.name, "charge_status") == 0)
1061                 command = BQ2415X_CHARGE_STATUS;
1062         else if (strcmp(attr->attr.name, "boost_status") == 0)
1063                 command = BQ2415X_BOOST_STATUS;
1064         else if (strcmp(attr->attr.name, "fault_status") == 0)
1065                 command = BQ2415X_FAULT_STATUS;
1066         else
1067                 return -EINVAL;
1068
1069         ret = bq2415x_exec_command(bq, command);
1070         if (ret < 0)
1071                 return ret;
1072         return sprintf(buf, "%d\n", ret);
1073 }
1074
1075 /*
1076  * set timer entry:
1077  *    auto - enable auto mode
1078  *    off - disable auto mode
1079  *    (other values) - reset chip timer
1080  */
1081 static ssize_t bq2415x_sysfs_set_timer(struct device *dev,
1082                                        struct device_attribute *attr,
1083                                        const char *buf,
1084                                        size_t count)
1085 {
1086         struct power_supply *psy = dev_get_drvdata(dev);
1087         struct bq2415x_device *bq = container_of(psy, struct bq2415x_device,
1088                                                 charger);
1089         int ret = 0;
1090
1091         if (strncmp(buf, "auto", 4) == 0)
1092                 bq2415x_set_autotimer(bq, 1);
1093         else if (strncmp(buf, "off", 3) == 0)
1094                 bq2415x_set_autotimer(bq, 0);
1095         else
1096                 ret = bq2415x_exec_command(bq, BQ2415X_TIMER_RESET);
1097
1098         if (ret < 0)
1099                 return ret;
1100         return count;
1101 }
1102
1103 /* show timer entry (auto or off) */
1104 static ssize_t bq2415x_sysfs_show_timer(struct device *dev,
1105                                         struct device_attribute *attr,
1106                                         char *buf)
1107 {
1108         struct power_supply *psy = dev_get_drvdata(dev);
1109         struct bq2415x_device *bq = container_of(psy, struct bq2415x_device,
1110                                                  charger);
1111
1112         if (bq->timer_error)
1113                 return sprintf(buf, "%s\n", bq->timer_error);
1114
1115         if (bq->autotimer)
1116                 return sprintf(buf, "auto\n");
1117         return sprintf(buf, "off\n");
1118 }
1119
1120 /*
1121  * set mode entry:
1122  *    auto - if automode is supported, enable it and set mode to reported
1123  *    none - disable charger and boost mode
1124  *    host - charging mode for host/hub chargers (current limit 500mA)
1125  *    dedicated - charging mode for dedicated chargers (unlimited current limit)
1126  *    boost - disable charger and enable boost mode
1127  */
1128 static ssize_t bq2415x_sysfs_set_mode(struct device *dev,
1129                                       struct device_attribute *attr,
1130                                       const char *buf,
1131                                       size_t count)
1132 {
1133         struct power_supply *psy = dev_get_drvdata(dev);
1134         struct bq2415x_device *bq = container_of(psy, struct bq2415x_device,
1135                                                  charger);
1136         enum bq2415x_mode mode;
1137         int ret = 0;
1138
1139         if (strncmp(buf, "auto", 4) == 0) {
1140                 if (bq->automode < 0)
1141                         return -ENOSYS;
1142                 bq->automode = 1;
1143                 mode = bq->reported_mode;
1144         } else if (strncmp(buf, "off", 3) == 0) {
1145                 if (bq->automode > 0)
1146                         bq->automode = 0;
1147                 mode = BQ2415X_MODE_OFF;
1148         } else if (strncmp(buf, "none", 4) == 0) {
1149                 if (bq->automode > 0)
1150                         bq->automode = 0;
1151                 mode = BQ2415X_MODE_NONE;
1152         } else if (strncmp(buf, "host", 4) == 0) {
1153                 if (bq->automode > 0)
1154                         bq->automode = 0;
1155                 mode = BQ2415X_MODE_HOST_CHARGER;
1156         } else if (strncmp(buf, "dedicated", 9) == 0) {
1157                 if (bq->automode > 0)
1158                         bq->automode = 0;
1159                 mode = BQ2415X_MODE_DEDICATED_CHARGER;
1160         } else if (strncmp(buf, "boost", 5) == 0) {
1161                 if (bq->automode > 0)
1162                         bq->automode = 0;
1163                 mode = BQ2415X_MODE_BOOST;
1164         } else if (strncmp(buf, "reset", 5) == 0) {
1165                 bq2415x_reset_chip(bq);
1166                 bq2415x_set_defaults(bq);
1167                 if (bq->automode <= 0)
1168                         return count;
1169                 bq->automode = 1;
1170                 mode = bq->reported_mode;
1171         } else {
1172                 return -EINVAL;
1173         }
1174
1175         ret = bq2415x_set_mode(bq, mode);
1176         if (ret < 0)
1177                 return ret;
1178         return count;
1179 }
1180
1181 /* show mode entry (auto, none, host, dedicated or boost) */
1182 static ssize_t bq2415x_sysfs_show_mode(struct device *dev,
1183                                        struct device_attribute *attr,
1184                                        char *buf)
1185 {
1186         struct power_supply *psy = dev_get_drvdata(dev);
1187         struct bq2415x_device *bq = container_of(psy, struct bq2415x_device,
1188                                                 charger);
1189         ssize_t ret = 0;
1190
1191         if (bq->automode > 0)
1192                 ret += sprintf(buf+ret, "auto (");
1193
1194         switch (bq->mode) {
1195         case BQ2415X_MODE_OFF:
1196                 ret += sprintf(buf+ret, "off");
1197                 break;
1198         case BQ2415X_MODE_NONE:
1199                 ret += sprintf(buf+ret, "none");
1200                 break;
1201         case BQ2415X_MODE_HOST_CHARGER:
1202                 ret += sprintf(buf+ret, "host");
1203                 break;
1204         case BQ2415X_MODE_DEDICATED_CHARGER:
1205                 ret += sprintf(buf+ret, "dedicated");
1206                 break;
1207         case BQ2415X_MODE_BOOST:
1208                 ret += sprintf(buf+ret, "boost");
1209                 break;
1210         }
1211
1212         if (bq->automode > 0)
1213                 ret += sprintf(buf+ret, ")");
1214
1215         ret += sprintf(buf+ret, "\n");
1216         return ret;
1217 }
1218
1219 /* show reported_mode entry (none, host, dedicated or boost) */
1220 static ssize_t bq2415x_sysfs_show_reported_mode(struct device *dev,
1221                                                 struct device_attribute *attr,
1222                                                 char *buf)
1223 {
1224         struct power_supply *psy = dev_get_drvdata(dev);
1225         struct bq2415x_device *bq = container_of(psy, struct bq2415x_device,
1226                                                  charger);
1227
1228         if (bq->automode < 0)
1229                 return -EINVAL;
1230
1231         switch (bq->reported_mode) {
1232         case BQ2415X_MODE_OFF:
1233                 return sprintf(buf, "off\n");
1234         case BQ2415X_MODE_NONE:
1235                 return sprintf(buf, "none\n");
1236         case BQ2415X_MODE_HOST_CHARGER:
1237                 return sprintf(buf, "host\n");
1238         case BQ2415X_MODE_DEDICATED_CHARGER:
1239                 return sprintf(buf, "dedicated\n");
1240         case BQ2415X_MODE_BOOST:
1241                 return sprintf(buf, "boost\n");
1242         }
1243
1244         return -EINVAL;
1245 }
1246
1247 /* directly set raw value to chip register, format: 'register value' */
1248 static ssize_t bq2415x_sysfs_set_registers(struct device *dev,
1249                                            struct device_attribute *attr,
1250                                            const char *buf,
1251                                            size_t count)
1252 {
1253         struct power_supply *psy = dev_get_drvdata(dev);
1254         struct bq2415x_device *bq = container_of(psy, struct bq2415x_device,
1255                                                  charger);
1256         ssize_t ret = 0;
1257         unsigned int reg;
1258         unsigned int val;
1259
1260         if (sscanf(buf, "%x %x", &reg, &val) != 2)
1261                 return -EINVAL;
1262
1263         if (reg > 4 || val > 255)
1264                 return -EINVAL;
1265
1266         ret = bq2415x_i2c_write(bq, reg, val);
1267         if (ret < 0)
1268                 return ret;
1269         return count;
1270 }
1271
1272 /* print value of chip register, format: 'register=value' */
1273 static ssize_t bq2415x_sysfs_print_reg(struct bq2415x_device *bq,
1274                                        u8 reg,
1275                                        char *buf)
1276 {
1277         int ret = bq2415x_i2c_read(bq, reg);
1278
1279         if (ret < 0)
1280                 return sprintf(buf, "%#.2x=error %d\n", reg, ret);
1281         return sprintf(buf, "%#.2x=%#.2x\n", reg, ret);
1282 }
1283
1284 /* show all raw values of chip register, format per line: 'register=value' */
1285 static ssize_t bq2415x_sysfs_show_registers(struct device *dev,
1286                                             struct device_attribute *attr,
1287                                             char *buf)
1288 {
1289         struct power_supply *psy = dev_get_drvdata(dev);
1290         struct bq2415x_device *bq = container_of(psy, struct bq2415x_device,
1291                                                  charger);
1292         ssize_t ret = 0;
1293
1294         ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_STATUS, buf+ret);
1295         ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_CONTROL, buf+ret);
1296         ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_VOLTAGE, buf+ret);
1297         ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_VENDER, buf+ret);
1298         ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_CURRENT, buf+ret);
1299         return ret;
1300 }
1301
1302 /* set current and voltage limit entries (in mA or mV) */
1303 static ssize_t bq2415x_sysfs_set_limit(struct device *dev,
1304                                        struct device_attribute *attr,
1305                                        const char *buf,
1306                                        size_t count)
1307 {
1308         struct power_supply *psy = dev_get_drvdata(dev);
1309         struct bq2415x_device *bq = container_of(psy, struct bq2415x_device,
1310                                                  charger);
1311         long val;
1312         int ret;
1313
1314         if (kstrtol(buf, 10, &val) < 0)
1315                 return -EINVAL;
1316
1317         if (strcmp(attr->attr.name, "current_limit") == 0)
1318                 ret = bq2415x_set_current_limit(bq, val);
1319         else if (strcmp(attr->attr.name, "weak_battery_voltage") == 0)
1320                 ret = bq2415x_set_weak_battery_voltage(bq, val);
1321         else if (strcmp(attr->attr.name, "battery_regulation_voltage") == 0)
1322                 ret = bq2415x_set_battery_regulation_voltage(bq, val);
1323         else if (strcmp(attr->attr.name, "charge_current") == 0)
1324                 ret = bq2415x_set_charge_current(bq, val);
1325         else if (strcmp(attr->attr.name, "termination_current") == 0)
1326                 ret = bq2415x_set_termination_current(bq, val);
1327         else
1328                 return -EINVAL;
1329
1330         if (ret < 0)
1331                 return ret;
1332         return count;
1333 }
1334
1335 /* show current and voltage limit entries (in mA or mV) */
1336 static ssize_t bq2415x_sysfs_show_limit(struct device *dev,
1337                                         struct device_attribute *attr,
1338                                         char *buf)
1339 {
1340         struct power_supply *psy = dev_get_drvdata(dev);
1341         struct bq2415x_device *bq = container_of(psy, struct bq2415x_device,
1342                                                  charger);
1343         int ret;
1344
1345         if (strcmp(attr->attr.name, "current_limit") == 0)
1346                 ret = bq2415x_get_current_limit(bq);
1347         else if (strcmp(attr->attr.name, "weak_battery_voltage") == 0)
1348                 ret = bq2415x_get_weak_battery_voltage(bq);
1349         else if (strcmp(attr->attr.name, "battery_regulation_voltage") == 0)
1350                 ret = bq2415x_get_battery_regulation_voltage(bq);
1351         else if (strcmp(attr->attr.name, "charge_current") == 0)
1352                 ret = bq2415x_get_charge_current(bq);
1353         else if (strcmp(attr->attr.name, "termination_current") == 0)
1354                 ret = bq2415x_get_termination_current(bq);
1355         else
1356                 return -EINVAL;
1357
1358         if (ret < 0)
1359                 return ret;
1360         return sprintf(buf, "%d\n", ret);
1361 }
1362
1363 /* set *_enable entries */
1364 static ssize_t bq2415x_sysfs_set_enable(struct device *dev,
1365                                         struct device_attribute *attr,
1366                                         const char *buf,
1367                                         size_t count)
1368 {
1369         struct power_supply *psy = dev_get_drvdata(dev);
1370         struct bq2415x_device *bq = container_of(psy, struct bq2415x_device,
1371                                                  charger);
1372         enum bq2415x_command command;
1373         long val;
1374         int ret;
1375
1376         if (kstrtol(buf, 10, &val) < 0)
1377                 return -EINVAL;
1378
1379         if (strcmp(attr->attr.name, "charge_termination_enable") == 0)
1380                 command = val ? BQ2415X_CHARGE_TERMINATION_ENABLE :
1381                         BQ2415X_CHARGE_TERMINATION_DISABLE;
1382         else if (strcmp(attr->attr.name, "high_impedance_enable") == 0)
1383                 command = val ? BQ2415X_HIGH_IMPEDANCE_ENABLE :
1384                         BQ2415X_HIGH_IMPEDANCE_DISABLE;
1385         else if (strcmp(attr->attr.name, "otg_pin_enable") == 0)
1386                 command = val ? BQ2415X_OTG_PIN_ENABLE :
1387                         BQ2415X_OTG_PIN_DISABLE;
1388         else if (strcmp(attr->attr.name, "stat_pin_enable") == 0)
1389                 command = val ? BQ2415X_STAT_PIN_ENABLE :
1390                         BQ2415X_STAT_PIN_DISABLE;
1391         else
1392                 return -EINVAL;
1393
1394         ret = bq2415x_exec_command(bq, command);
1395         if (ret < 0)
1396                 return ret;
1397         return count;
1398 }
1399
1400 /* show *_enable entries */
1401 static ssize_t bq2415x_sysfs_show_enable(struct device *dev,
1402                                          struct device_attribute *attr,
1403                                          char *buf)
1404 {
1405         struct power_supply *psy = dev_get_drvdata(dev);
1406         struct bq2415x_device *bq = container_of(psy, struct bq2415x_device,
1407                                                  charger);
1408         enum bq2415x_command command;
1409         int ret;
1410
1411         if (strcmp(attr->attr.name, "charge_termination_enable") == 0)
1412                 command = BQ2415X_CHARGE_TERMINATION_STATUS;
1413         else if (strcmp(attr->attr.name, "high_impedance_enable") == 0)
1414                 command = BQ2415X_HIGH_IMPEDANCE_STATUS;
1415         else if (strcmp(attr->attr.name, "otg_pin_enable") == 0)
1416                 command = BQ2415X_OTG_PIN_STATUS;
1417         else if (strcmp(attr->attr.name, "stat_pin_enable") == 0)
1418                 command = BQ2415X_STAT_PIN_STATUS;
1419         else
1420                 return -EINVAL;
1421
1422         ret = bq2415x_exec_command(bq, command);
1423         if (ret < 0)
1424                 return ret;
1425         return sprintf(buf, "%d\n", ret);
1426 }
1427
1428 static DEVICE_ATTR(current_limit, S_IWUSR | S_IRUGO,
1429                 bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit);
1430 static DEVICE_ATTR(weak_battery_voltage, S_IWUSR | S_IRUGO,
1431                 bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit);
1432 static DEVICE_ATTR(battery_regulation_voltage, S_IWUSR | S_IRUGO,
1433                 bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit);
1434 static DEVICE_ATTR(charge_current, S_IWUSR | S_IRUGO,
1435                 bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit);
1436 static DEVICE_ATTR(termination_current, S_IWUSR | S_IRUGO,
1437                 bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit);
1438
1439 static DEVICE_ATTR(charge_termination_enable, S_IWUSR | S_IRUGO,
1440                 bq2415x_sysfs_show_enable, bq2415x_sysfs_set_enable);
1441 static DEVICE_ATTR(high_impedance_enable, S_IWUSR | S_IRUGO,
1442                 bq2415x_sysfs_show_enable, bq2415x_sysfs_set_enable);
1443 static DEVICE_ATTR(otg_pin_enable, S_IWUSR | S_IRUGO,
1444                 bq2415x_sysfs_show_enable, bq2415x_sysfs_set_enable);
1445 static DEVICE_ATTR(stat_pin_enable, S_IWUSR | S_IRUGO,
1446                 bq2415x_sysfs_show_enable, bq2415x_sysfs_set_enable);
1447
1448 static DEVICE_ATTR(reported_mode, S_IRUGO,
1449                 bq2415x_sysfs_show_reported_mode, NULL);
1450 static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO,
1451                 bq2415x_sysfs_show_mode, bq2415x_sysfs_set_mode);
1452 static DEVICE_ATTR(timer, S_IWUSR | S_IRUGO,
1453                 bq2415x_sysfs_show_timer, bq2415x_sysfs_set_timer);
1454
1455 static DEVICE_ATTR(registers, S_IWUSR | S_IRUGO,
1456                 bq2415x_sysfs_show_registers, bq2415x_sysfs_set_registers);
1457
1458 static DEVICE_ATTR(otg_status, S_IRUGO, bq2415x_sysfs_show_status, NULL);
1459 static DEVICE_ATTR(charge_status, S_IRUGO, bq2415x_sysfs_show_status, NULL);
1460 static DEVICE_ATTR(boost_status, S_IRUGO, bq2415x_sysfs_show_status, NULL);
1461 static DEVICE_ATTR(fault_status, S_IRUGO, bq2415x_sysfs_show_status, NULL);
1462
1463 static struct attribute *bq2415x_sysfs_attributes[] = {
1464         /*
1465          * TODO: some (appropriate) of these attrs should be switched to
1466          * use power supply class props.
1467          */
1468         &dev_attr_current_limit.attr,
1469         &dev_attr_weak_battery_voltage.attr,
1470         &dev_attr_battery_regulation_voltage.attr,
1471         &dev_attr_charge_current.attr,
1472         &dev_attr_termination_current.attr,
1473
1474         &dev_attr_charge_termination_enable.attr,
1475         &dev_attr_high_impedance_enable.attr,
1476         &dev_attr_otg_pin_enable.attr,
1477         &dev_attr_stat_pin_enable.attr,
1478
1479         &dev_attr_reported_mode.attr,
1480         &dev_attr_mode.attr,
1481         &dev_attr_timer.attr,
1482
1483         &dev_attr_registers.attr,
1484
1485         &dev_attr_otg_status.attr,
1486         &dev_attr_charge_status.attr,
1487         &dev_attr_boost_status.attr,
1488         &dev_attr_fault_status.attr,
1489         NULL,
1490 };
1491
1492 static const struct attribute_group bq2415x_sysfs_attr_group = {
1493         .attrs = bq2415x_sysfs_attributes,
1494 };
1495
1496 static int bq2415x_sysfs_init(struct bq2415x_device *bq)
1497 {
1498         return sysfs_create_group(&bq->charger.dev->kobj,
1499                         &bq2415x_sysfs_attr_group);
1500 }
1501
1502 static void bq2415x_sysfs_exit(struct bq2415x_device *bq)
1503 {
1504         sysfs_remove_group(&bq->charger.dev->kobj, &bq2415x_sysfs_attr_group);
1505 }
1506
1507 /* main bq2415x probe function */
1508 static int bq2415x_probe(struct i2c_client *client,
1509                          const struct i2c_device_id *id)
1510 {
1511         int ret;
1512         int num;
1513         char *name;
1514         struct bq2415x_device *bq;
1515
1516         if (!client->dev.platform_data) {
1517                 dev_err(&client->dev, "platform data not set\n");
1518                 return -ENODEV;
1519         }
1520
1521         /* Get new ID for the new device */
1522         mutex_lock(&bq2415x_id_mutex);
1523         num = idr_alloc(&bq2415x_id, client, 0, 0, GFP_KERNEL);
1524         mutex_unlock(&bq2415x_id_mutex);
1525         if (num < 0)
1526                 return num;
1527
1528         name = kasprintf(GFP_KERNEL, "%s-%d", id->name, num);
1529         if (!name) {
1530                 dev_err(&client->dev, "failed to allocate device name\n");
1531                 ret = -ENOMEM;
1532                 goto error_1;
1533         }
1534
1535         bq = devm_kzalloc(&client->dev, sizeof(*bq), GFP_KERNEL);
1536         if (!bq) {
1537                 dev_err(&client->dev, "failed to allocate device data\n");
1538                 ret = -ENOMEM;
1539                 goto error_2;
1540         }
1541
1542         i2c_set_clientdata(client, bq);
1543
1544         bq->id = num;
1545         bq->dev = &client->dev;
1546         bq->chip = id->driver_data;
1547         bq->name = name;
1548         bq->mode = BQ2415X_MODE_OFF;
1549         bq->reported_mode = BQ2415X_MODE_OFF;
1550         bq->autotimer = 0;
1551         bq->automode = 0;
1552
1553         memcpy(&bq->init_data, client->dev.platform_data,
1554                         sizeof(bq->init_data));
1555
1556         bq2415x_reset_chip(bq);
1557
1558         ret = bq2415x_power_supply_init(bq);
1559         if (ret) {
1560                 dev_err(bq->dev, "failed to register power supply: %d\n", ret);
1561                 goto error_2;
1562         }
1563
1564         ret = bq2415x_sysfs_init(bq);
1565         if (ret) {
1566                 dev_err(bq->dev, "failed to create sysfs entries: %d\n", ret);
1567                 goto error_3;
1568         }
1569
1570         ret = bq2415x_set_defaults(bq);
1571         if (ret) {
1572                 dev_err(bq->dev, "failed to set default values: %d\n", ret);
1573                 goto error_4;
1574         }
1575
1576         if (bq->init_data.set_mode_hook) {
1577                 if (bq->init_data.set_mode_hook(
1578                                 bq2415x_hook_function, bq)) {
1579                         bq->automode = 1;
1580                         bq2415x_set_mode(bq, bq->reported_mode);
1581                         dev_info(bq->dev, "automode enabled\n");
1582                 } else {
1583                         bq->automode = -1;
1584                         dev_info(bq->dev, "automode failed\n");
1585                 }
1586         } else {
1587                 bq->automode = -1;
1588                 dev_info(bq->dev, "automode not supported\n");
1589         }
1590
1591         INIT_DELAYED_WORK(&bq->work, bq2415x_timer_work);
1592         bq2415x_set_autotimer(bq, 1);
1593
1594         dev_info(bq->dev, "driver registered\n");
1595         return 0;
1596
1597 error_4:
1598         bq2415x_sysfs_exit(bq);
1599 error_3:
1600         bq2415x_power_supply_exit(bq);
1601 error_2:
1602         kfree(name);
1603 error_1:
1604         mutex_lock(&bq2415x_id_mutex);
1605         idr_remove(&bq2415x_id, num);
1606         mutex_unlock(&bq2415x_id_mutex);
1607
1608         return ret;
1609 }
1610
1611 /* main bq2415x remove function */
1612
1613 static int bq2415x_remove(struct i2c_client *client)
1614 {
1615         struct bq2415x_device *bq = i2c_get_clientdata(client);
1616
1617         if (bq->init_data.set_mode_hook)
1618                 bq->init_data.set_mode_hook(NULL, NULL);
1619
1620         bq2415x_sysfs_exit(bq);
1621         bq2415x_power_supply_exit(bq);
1622
1623         bq2415x_reset_chip(bq);
1624
1625         mutex_lock(&bq2415x_id_mutex);
1626         idr_remove(&bq2415x_id, bq->id);
1627         mutex_unlock(&bq2415x_id_mutex);
1628
1629         dev_info(bq->dev, "driver unregistered\n");
1630
1631         kfree(bq->name);
1632
1633         return 0;
1634 }
1635
1636 static const struct i2c_device_id bq2415x_i2c_id_table[] = {
1637         { "bq2415x", BQUNKNOWN },
1638         { "bq24150", BQ24150 },
1639         { "bq24150a", BQ24150A },
1640         { "bq24151", BQ24151 },
1641         { "bq24151a", BQ24151A },
1642         { "bq24152", BQ24152 },
1643         { "bq24153", BQ24153 },
1644         { "bq24153a", BQ24153A },
1645         { "bq24155", BQ24155 },
1646         { "bq24156", BQ24156 },
1647         { "bq24156a", BQ24156A },
1648         { "bq24158", BQ24158 },
1649         {},
1650 };
1651 MODULE_DEVICE_TABLE(i2c, bq2415x_i2c_id_table);
1652
1653 static struct i2c_driver bq2415x_driver = {
1654         .driver = {
1655                 .name = "bq2415x-charger",
1656         },
1657         .probe = bq2415x_probe,
1658         .remove = bq2415x_remove,
1659         .id_table = bq2415x_i2c_id_table,
1660 };
1661 module_i2c_driver(bq2415x_driver);
1662
1663 MODULE_AUTHOR("Pali Rohár <pali.rohar@gmail.com>");
1664 MODULE_DESCRIPTION("bq2415x charger driver");
1665 MODULE_LICENSE("GPL");