drivers/power/bq27510_battery.c

   1 /*
   2  * BQ27510 battery driver
   3  *
   4  * This package is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  *
   8  * THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
   9  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  10  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  11  *
  12  */
  13 #include <linux/module.h>
  14 #include <linux/param.h>
  15 #include <linux/jiffies.h>
  16 #include <linux/workqueue.h>
  17 #include <linux/delay.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/power_supply.h>
  20 #include <linux/idr.h>
  21 #include <linux/i2c.h>
  22 #include <linux/slab.h>
  23 #include <asm/unaligned.h>
  24 #include <mach/gpio.h>
  25 #include <linux/proc_fs.h>
  26 #include <asm/uaccess.h>
  27 #include <mach/board.h>
  28
  29
  30 #define DRIVER_VERSION                  "1.1.0"
  31 #define BQ27x00_REG_TEMP                0x06
  32 #define BQ27x00_REG_VOLT                0x08
  33 #define BQ27x00_REG_AI                  0x14
  34 #define BQ27x00_REG_FLAGS               0x0A
  35 #define BQ27x00_REG_TTE                 0x16
  36 #define BQ27x00_REG_TTF                 0x18
  37 #define BQ27x00_REG_TTECP               0x26
  38 #define BQ27000_REG_RSOC                0x0B /* Relative State-of-Charge */
  39 #define BQ27500_REG_SOC                 0x2c
  40
  41 #define BQ27500_FLAG_DSC                BIT(0)
  42 #define BQ27000_FLAG_CHGS               BIT(8)
  43 #define BQ27500_FLAG_FC                 BIT(9)
  44 #define BQ27500_FLAG_OTD                BIT(14)
  45 #define BQ27500_FLAG_OTC                BIT(15)
  46
  47 #define BQ27510_SPEED                   300 * 1000
  48 int  virtual_battery_enable = 0;
  49 extern int dwc_vbus_status(void);
  50 static void bq27510_set(void);
  51
  52 #if 0
  53 #define DBG(x...) printk(KERN_INFO x)
  54 #else
  55 #define DBG(x...) do { } while (0)
  56 #endif
  57
  58 /* If the system has several batteries we need a different name for each
  59  * of them...
  60  */
  61 static DEFINE_MUTEX(battery_mutex);
  62
  63 struct bq27510_device_info {
  64         struct device           *dev;
  65         struct power_supply     bat;
  66         struct power_supply     ac;
  67         struct delayed_work work;
  68         struct i2c_client       *client;
  69         unsigned int interval;
  70         unsigned int dc_check_pin;
  71         unsigned int bat_num;
  72 };
  73
  74 static struct bq27510_device_info *bq27510_di;
  75 static enum power_supply_property bq27510_battery_props[] = {
  76         POWER_SUPPLY_PROP_STATUS,
  77         POWER_SUPPLY_PROP_PRESENT,
  78         POWER_SUPPLY_PROP_VOLTAGE_NOW,
  79         POWER_SUPPLY_PROP_CURRENT_NOW,
  80         POWER_SUPPLY_PROP_CAPACITY,
  81         POWER_SUPPLY_PROP_TEMP,
  82         POWER_SUPPLY_PROP_TECHNOLOGY,
  83         POWER_SUPPLY_PROP_HEALTH,
  84         //POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
  85         //POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
  86         //POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
  87 };
  88
  89 static enum power_supply_property rk29_ac_props[] = {
  90         POWER_SUPPLY_PROP_ONLINE,
  91 };
  92
  93 static ssize_t battery_proc_write(struct file *file,const char __user *buffer,
  94                          size_t count, loff_t *ppos)
  95 {
  96         char c;
  97         int rc;
  98         printk("USER:\n");
  99         printk("echo x >/proc/driver/power\n");
 100         printk("x=1,means just print log ||x=2,means log and data ||x= other,means close log\n");
 101
 102         rc = get_user(c,buffer);
 103         if(rc)
 104                 return rc;
 105
 106         //added by zwp,c='8' means check whether we need to download firmware to bq27xxx,return 0 means yes.
 107         if(c == '8'){
 108                 printk("%s,bq27510 need to download firmware\n",__FUNCTION__);
 109         }
 110
 111         if(c == '1')
 112                 virtual_battery_enable = 1;
 113         else if(c == '2')
 114                 virtual_battery_enable = 2;
 115         else if(c == '3')
 116                 virtual_battery_enable = 3;
 117         else if(c == '9'){
 118                 printk("%s:%d>>bq27510 set\n",__FUNCTION__,__LINE__);
 119                 bq27510_set();
 120         }
 121         else
 122                 virtual_battery_enable = 0;
 123         printk("%s,count(%d),virtual_battery_enable(%d)\n",__FUNCTION__,(int)count,virtual_battery_enable);
 124         return count;
 125 }
 126
 127 static const struct file_operations battery_proc_fops = {
 128         .owner          = THIS_MODULE,
 129         .write          = battery_proc_write,
 130 };
 131
 132 /*
 133  * Common code for BQ27510 devices read
 134  */
 135 static int bq27510_read(struct i2c_client *client, u8 reg, u8 buf[], unsigned len)
 136 {
 137         int ret;
 138         ret = i2c_master_reg8_recv(client, reg, buf, len, BQ27510_SPEED);
 139         return ret;
 140 }
 141
 142 static int bq27510_write(struct i2c_client *client, u8 reg, u8 const buf[], unsigned len)
 143 {
 144         int ret;
 145         ret = i2c_master_reg8_send(client, reg, buf, (int)len, BQ27510_SPEED);
 146         return ret;
 147 }
 148
 149 /*
 150  * Return the battery temperature in tenths of degree Celsius
 151  * Or < 0 if something fails.
 152  */
 153 static int bq27510_battery_temperature(struct bq27510_device_info *di)
 154 {
 155         int ret;
 156         int temp = 0;
 157         u8 buf[2];
 158
 159         #if defined (CONFIG_NO_BATTERY_IC)
 160         return 258;
 161         #endif
 162
 163         if(virtual_battery_enable == 1)
 164                 return 125/*258*/;
 165         ret = bq27510_read(di->client,BQ27x00_REG_TEMP,buf,2);
 166         if (ret<0) {
 167                 dev_err(di->dev, "error reading temperature\n");
 168                 return ret;
 169         }
 170         temp = get_unaligned_le16(buf);
 171         temp = temp - 2731;
 172         DBG("Enter:%s %d--temp = %d\n",__FUNCTION__,__LINE__,temp);
 173         return temp;
 174 }
 175
 176 /*
 177  * Return the battery Voltage in milivolts
 178  * Or < 0 if something fails.
 179  */
 180 static int bq27510_battery_voltage(struct bq27510_device_info *di)
 181 {
 182         int ret;
 183         u8 buf[2];
 184         int volt = 0;
 185
 186         #if defined (CONFIG_NO_BATTERY_IC)
 187                 return 4000000;
 188         #endif
 189         if(virtual_battery_enable == 1)
 190                 return 2000000/*4000000*/;
 191
 192         ret = bq27510_read(di->client,BQ27x00_REG_VOLT,buf,2);
 193         if (ret<0) {
 194                 dev_err(di->dev, "error reading voltage\n");
 195                 return ret;
 196         }
 197         volt = get_unaligned_le16(buf);
 198
 199         //bp27510 can only measure one li-lion bat
 200         if(di->bat_num == 2){
 201                 volt = volt * 1000 * 2;
 202         }else{
 203                 volt = volt * 1000;
 204         }
 205
 206         DBG("Enter:%s %d--volt = %d\n",__FUNCTION__,__LINE__,volt);
 207         return volt;
 208 }
 209
 210 /*
 211  * Return the battery average current
 212  * Note that current can be negative signed as well
 213  * Or 0 if something fails.
 214  */
 215 static int bq27510_battery_current(struct bq27510_device_info *di)
 216 {
 217         int ret;
 218         int curr = 0;
 219         u8 buf[2];
 220
 221         #if defined (CONFIG_NO_BATTERY_IC)
 222                 return 22000;
 223         #endif
 224         if(virtual_battery_enable == 1)
 225                 return 11000/*22000*/;
 226         ret = bq27510_read(di->client,BQ27x00_REG_AI,buf,2);
 227         if (ret<0) {
 228                 dev_err(di->dev, "error reading current\n");
 229                 return 0;
 230         }
 231
 232         curr = get_unaligned_le16(buf);
 233         DBG("curr = %x \n",curr);
 234         if(curr>0x8000){
 235                 curr = 0xFFFF^(curr-1);
 236         }
 237         curr = curr * 1000;
 238         DBG("Enter:%s %d--curr = %d\n",__FUNCTION__,__LINE__,curr);
 239         return curr;
 240 }
 241
 242 /*
 243  * Return the battery Relative State-of-Charge
 244  * Or < 0 if something fails.
 245  */
 246 static int bq27510_battery_rsoc(struct bq27510_device_info *di)
 247 {
 248         int ret;
 249         int rsoc = 0;
 250         #if 0
 251         int nvcap = 0,facap = 0,remcap=0,fccap=0,full=0,cnt=0;
 252         int art = 0, artte = 0, ai = 0, tte = 0, ttf = 0, si = 0;
 253         int stte = 0, mli = 0, mltte = 0, ae = 0, ap = 0, ttecp = 0, cc = 0;
 254         #endif
 255         u8 buf[2];
 256
 257         #if defined (CONFIG_NO_BATTERY_IC)
 258                 return 100;
 259         #endif
 260         if(virtual_battery_enable == 1)
 261                 return 50/*100*/;
 262
 263         ret = bq27510_read(di->client,BQ27500_REG_SOC,buf,2);
 264         if (ret<0) {
 265                 dev_err(di->dev, "error reading relative State-of-Charge\n");
 266                 return ret;
 267         }
 268         rsoc = get_unaligned_le16(buf);
 269         DBG("Enter:%s %d--rsoc = %d\n",__FUNCTION__,__LINE__,rsoc);
 270
 271         #if defined (CONFIG_NO_BATTERY_IC)
 272         rsoc = 100;
 273         #endif
 274         #if 0     //other register information, for debug use
 275         ret = bq27510_read(di->client,0x0c,buf,2);              //NominalAvailableCapacity
 276         nvcap = get_unaligned_le16(buf);
 277         DBG("\nEnter:%s %d--nvcap = %d\n",__FUNCTION__,__LINE__,nvcap);
 278         ret = bq27510_read(di->client,0x0e,buf,2);              //FullAvailableCapacity
 279         facap = get_unaligned_le16(buf);
 280         DBG("Enter:%s %d--facap = %d\n",__FUNCTION__,__LINE__,facap);
 281         ret = bq27510_read(di->client,0x10,buf,2);              //RemainingCapacity
 282         remcap = get_unaligned_le16(buf);
 283         DBG("Enter:%s %d--remcap = %d\n",__FUNCTION__,__LINE__,remcap);
 284         ret = bq27510_read(di->client,0x12,buf,2);              //FullChargeCapacity
 285         fccap = get_unaligned_le16(buf);
 286         DBG("Enter:%s %d--fccap = %d\n",__FUNCTION__,__LINE__,fccap);
 287         ret = bq27510_read(di->client,0x3c,buf,2);              //DesignCapacity
 288         full = get_unaligned_le16(buf);
 289         DBG("Enter:%s %d--DesignCapacity = %d\n",__FUNCTION__,__LINE__,full);
 290
 291         buf[0] = 0x00;                                          //CONTROL_STATUS
 292         buf[1] = 0x00;
 293         bq27510_write(di->client,0x00,buf,2);
 294         ret = bq27510_read(di->client,0x00,buf,2);
 295         cnt = get_unaligned_le16(buf);
 296         DBG("Enter:%s %d--Control status = %x\n",__FUNCTION__,__LINE__,cnt);
 297
 298         ret = bq27510_read(di->client,0x02,buf,2);              //AtRate
 299         art = get_unaligned_le16(buf);
 300         DBG("Enter:%s %d--AtRate = %d\n",__FUNCTION__,__LINE__,art);
 301         ret = bq27510_read(di->client,0x04,buf,2);              //AtRateTimeToEmpty
 302         artte = get_unaligned_le16(buf);
 303         DBG("Enter:%s %d--AtRateTimeToEmpty = %d\n",__FUNCTION__,__LINE__,artte);
 304         ret = bq27510_read(di->client,0x14,buf,2);              //AverageCurrent
 305         ai = get_unaligned_le16(buf);
 306         DBG("Enter:%s %d--AverageCurrent = %d\n",__FUNCTION__,__LINE__,ai);
 307         ret = bq27510_read(di->client,0x16,buf,2);              //TimeToEmpty
 308         tte = get_unaligned_le16(buf);
 309         DBG("Enter:%s %d--TimeToEmpty = %d\n",__FUNCTION__,__LINE__,tte);
 310         ret = bq27510_read(di->client,0x18,buf,2);              //TimeToFull
 311         ttf = get_unaligned_le16(buf);
 312         DBG("Enter:%s %d--TimeToFull = %d\n",__FUNCTION__,__LINE__,ttf);
 313         ret = bq27510_read(di->client,0x1a,buf,2);              //StandbyCurrent
 314         si = get_unaligned_le16(buf);
 315         DBG("Enter:%s %d--StandbyCurrent = %d\n",__FUNCTION__,__LINE__,si);
 316         ret = bq27510_read(di->client,0x1c,buf,2);              //StandbyTimeToEmpty
 317         stte = get_unaligned_le16(buf);
 318         DBG("Enter:%s %d--StandbyTimeToEmpty = %d\n",__FUNCTION__,__LINE__,stte);
 319         ret = bq27510_read(di->client,0x1e,buf,2);              //MaxLoadCurrent
 320         mli = get_unaligned_le16(buf);
 321         DBG("Enter:%s %d--MaxLoadCurrent = %d\n",__FUNCTION__,__LINE__,mli);
 322         ret = bq27510_read(di->client,0x20,buf,2);              //MaxLoadTimeToEmpty
 323         mltte = get_unaligned_le16(buf);
 324         DBG("Enter:%s %d--MaxLoadTimeToEmpty = %d\n",__FUNCTION__,__LINE__,mltte);
 325         ret = bq27510_read(di->client,0x22,buf,2);              //AvailableEnergy
 326         ae = get_unaligned_le16(buf);
 327         DBG("Enter:%s %d--AvailableEnergy = %d\n",__FUNCTION__,__LINE__,ae);
 328         ret = bq27510_read(di->client,0x24,buf,2);              //AveragePower
 329         ap = get_unaligned_le16(buf);
 330         DBG("Enter:%s %d--AveragePower = %d\n",__FUNCTION__,__LINE__,ap);
 331         ret = bq27510_read(di->client,0x26,buf,2);              //TTEatConstantPower
 332         ttecp = get_unaligned_le16(buf);
 333         DBG("Enter:%s %d--TTEatConstantPower = %d\n",__FUNCTION__,__LINE__,ttecp);
 334         ret = bq27510_read(di->client,0x2a,buf,2);              //CycleCount
 335         cc = get_unaligned_le16(buf);
 336         DBG("Enter:%s %d--CycleCount = %d\n",__FUNCTION__,__LINE__,cc);
 337         #endif
 338         return rsoc;
 339 }
 340
 341 static int bq27510_battery_status(struct bq27510_device_info *di,
 342                                   union power_supply_propval *val)
 343 {
 344         u8 buf[2];
 345         int flags = 0;
 346         int status;
 347         int ret;
 348
 349         #if defined (CONFIG_NO_BATTERY_IC)
 350                 val->intval = POWER_SUPPLY_STATUS_FULL;
 351         return 0;
 352         #endif
 353
 354         if(virtual_battery_enable == 1)
 355         {
 356                 val->intval = POWER_SUPPLY_STATUS_FULL;
 357                 return 0;
 358         }
 359         ret = bq27510_read(di->client,BQ27x00_REG_FLAGS, buf, 2);
 360         if (ret < 0) {
 361                 dev_err(di->dev, "error reading flags\n");
 362                 return ret;
 363         }
 364         flags = get_unaligned_le16(buf);
 365         DBG("Enter:%s %d--status = %x\n",__FUNCTION__,__LINE__,flags);
 366         if (flags & BQ27500_FLAG_FC)
 367                 status = POWER_SUPPLY_STATUS_FULL;
 368         else if (flags & BQ27500_FLAG_DSC)
 369                 status = POWER_SUPPLY_STATUS_DISCHARGING;
 370         else
 371                 status = POWER_SUPPLY_STATUS_CHARGING;
 372
 373         val->intval = status;
 374         return 0;
 375 }
 376
 377 static int bq27510_health_status(struct bq27510_device_info *di,
 378                                   union power_supply_propval *val)
 379 {
 380         u8 buf[2];
 381         int flags = 0;
 382         int status;
 383         int ret;
 384
 385         #if defined (CONFIG_NO_BATTERY_IC)
 386                 val->intval = POWER_SUPPLY_HEALTH_GOOD;
 387         return 0;
 388         #endif
 389
 390         if(virtual_battery_enable == 1)
 391         {
 392                 val->intval = POWER_SUPPLY_HEALTH_GOOD;
 393                 return 0;
 394         }
 395         ret = bq27510_read(di->client,BQ27x00_REG_FLAGS, buf, 2);
 396         if (ret < 0) {
 397                 dev_err(di->dev, "error reading flags\n");
 398                 return ret;
 399         }
 400         flags = get_unaligned_le16(buf);
 401         DBG("Enter:%s %d--status = %x\n",__FUNCTION__,__LINE__,flags);
 402         if ((flags & BQ27500_FLAG_OTD)||(flags & BQ27500_FLAG_OTC))
 403                 status = POWER_SUPPLY_HEALTH_OVERHEAT;
 404         else
 405                 status = POWER_SUPPLY_HEALTH_GOOD;
 406
 407         val->intval = status;
 408         return 0;
 409 }
 410
 411
 412 /*
 413  * Read a time register.
 414  * Return < 0 if something fails.
 415  */
 416 static int bq27510_battery_time(struct bq27510_device_info *di, int reg,
 417                                 union power_supply_propval *val)
 418 {
 419         u8 buf[2];
 420         int tval = 0;
 421         int ret;
 422
 423         ret = bq27510_read(di->client,reg,buf,2);
 424         if (ret<0) {
 425                 dev_err(di->dev, "error reading register %02x\n", reg);
 426                 return ret;
 427         }
 428         tval = get_unaligned_le16(buf);
 429         DBG("Enter:%s %d--tval=%d\n",__FUNCTION__,__LINE__,tval);
 430         if (tval == 65535)
 431                 return -ENODATA;
 432
 433         val->intval = tval * 60;
 434         DBG("Enter:%s %d val->intval = %d\n",__FUNCTION__,__LINE__,val->intval);
 435         return 0;
 436 }
 437
 438 #define to_bq27510_device_info(x) container_of((x), \
 439                                 struct bq27510_device_info, bat);
 440
 441 static int bq27510_battery_get_property(struct power_supply *psy,
 442                                         enum power_supply_property psp,
 443                                         union power_supply_propval *val)
 444 {
 445         int ret = 0;
 446         struct bq27510_device_info *di = to_bq27510_device_info(psy);
 447         DBG("Enter:%s %d psp= %d\n",__FUNCTION__,__LINE__,psp);
 448
 449         switch (psp) {
 450
 451         case POWER_SUPPLY_PROP_STATUS:
 452                 ret = bq27510_battery_status(di, val);
 453                 break;
 454         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 455         case POWER_SUPPLY_PROP_PRESENT:
 456                 val->intval = bq27510_battery_voltage(di);
 457                 if (psp == POWER_SUPPLY_PROP_PRESENT)
 458                         val->intval = val->intval <= 0 ? 0 : 1;
 459                 break;
 460         case POWER_SUPPLY_PROP_CURRENT_NOW:
 461                 val->intval = bq27510_battery_current(di);
 462                 break;
 463         case POWER_SUPPLY_PROP_CAPACITY:
 464                 val->intval = bq27510_battery_rsoc(di);
 465                 break;
 466         case POWER_SUPPLY_PROP_TEMP:
 467                 val->intval = bq27510_battery_temperature(di);
 468                 break;
 469         case POWER_SUPPLY_PROP_TECHNOLOGY:
 470                 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
 471                 break;
 472         case POWER_SUPPLY_PROP_HEALTH:
 473                 ret = bq27510_health_status(di, val);
 474                 break;
 475         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
 476                 ret = bq27510_battery_time(di, BQ27x00_REG_TTE, val);
 477                 break;
 478         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
 479                 ret = bq27510_battery_time(di, BQ27x00_REG_TTECP, val);
 480                 break;
 481         case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
 482                 ret = bq27510_battery_time(di, BQ27x00_REG_TTF, val);
 483                 break;
 484         default:
 485                 return -EINVAL;
 486         }
 487
 488         return ret;
 489 }
 490
 491 static int rk29_ac_get_property(struct power_supply *psy,
 492                         enum power_supply_property psp,
 493                         union power_supply_propval *val)
 494 {
 495         int ret = 0;
 496         struct bq27510_device_info *di = container_of(psy, struct bq27510_device_info, ac);
 497
 498         switch (psp) {
 499         case POWER_SUPPLY_PROP_ONLINE:
 500                 if (psy->type == POWER_SUPPLY_TYPE_MAINS){
 501                         if(gpio_get_value(di->dc_check_pin))
 502                                 val->intval = 0;        /*discharging*/
 503                         else
 504                                 val->intval = 1;        /*charging*/
 505                 }
 506                 DBG("%s:%d val->intval = %d\n",__FUNCTION__,__LINE__,val->intval);
 507                 break;
 508
 509         default:
 510                 ret = -EINVAL;
 511                 break;
 512         }
 513         return ret;
 514 }
 515
 516 static void bq27510_powersupply_init(struct bq27510_device_info *di)
 517 {
 518         di->bat.type = POWER_SUPPLY_TYPE_BATTERY;
 519         di->bat.properties = bq27510_battery_props;
 520         di->bat.num_properties = ARRAY_SIZE(bq27510_battery_props);
 521         di->bat.get_property = bq27510_battery_get_property;
 522
 523         di->ac.name = "ac";
 524         di->ac.type = POWER_SUPPLY_TYPE_MAINS;
 525         di->ac.properties = rk29_ac_props;
 526         di->ac.num_properties = ARRAY_SIZE(rk29_ac_props);
 527         di->ac.get_property = rk29_ac_get_property;
 528 }
 529
 530
 531 static void bq27510_battery_update_status(struct bq27510_device_info *di)
 532 {
 533         power_supply_changed(&di->bat);
 534 }
 535
 536 static void bq27510_battery_work(struct work_struct *work)
 537 {
 538         struct bq27510_device_info *di = container_of(work, struct bq27510_device_info, work.work);
 539         bq27510_battery_update_status(di);
 540         /* reschedule for the next time */
 541         schedule_delayed_work(&di->work, di->interval);
 542 }
 543
 544 static void bq27510_set(void)
 545 {
 546         struct bq27510_device_info *di;
 547         int i = 0;
 548         u8 buf[2];
 549
 550         di = bq27510_di;
 551         printk("enter 0x41\n");
 552         buf[0] = 0x41;
 553         buf[1] = 0x00;
 554         bq27510_write(di->client,0x00,buf,2);
 555
 556         msleep(1500);
 557
 558         printk("enter 0x21\n");
 559         buf[0] = 0x21;
 560         buf[1] = 0x00;
 561         bq27510_write(di->client,0x00,buf,2);
 562
 563         buf[0] = 0;
 564         buf[1] = 0;
 565         bq27510_read(di->client,0x00,buf,2);
 566
 567         // printk("%s: Enter:BUF[0]= 0X%x   BUF[1] = 0X%x\n",__FUNCTION__,buf[0],buf[1]);
 568
 569         while((buf[0] & 0x04)&&(i<5))
 570         {
 571                 printk("enter more 0x21 times i = %d\n",i);
 572                 mdelay(1000);
 573                 buf[0] = 0x21;
 574                 buf[1] = 0x00;
 575                 bq27510_write(di->client,0x00,buf,2);
 576
 577                 buf[0] = 0;
 578                 buf[1] = 0;
 579                 bq27510_read(di->client,0x00,buf,2);
 580                 i++;
 581         }
 582
 583         if(i>5)
 584                 printk("write 0x21 error\n");
 585         else
 586                 printk("bq27510 write 0x21 success\n");
 587 }
 588
 589 static int bq27510_battery_probe(struct i2c_client *client,
 590                                  const struct i2c_device_id *id)
 591 {
 592         struct bq27510_device_info *di;
 593         int retval = 0;
 594         struct bq27510_platform_data *pdata;
 595
 596         pdata = client->dev.platform_data;
 597
 598         di = kzalloc(sizeof(*di), GFP_KERNEL);
 599         if (!di) {
 600                 dev_err(&client->dev, "failed to allocate device info data\n");
 601                 retval = -ENOMEM;
 602                 goto batt_failed_2;
 603         }
 604         i2c_set_clientdata(client, di);
 605         di->dev = &client->dev;
 606         di->bat.name = "bq27510-battery";
 607         di->client = client;
 608         /* 4 seconds between monotor runs interval */
 609         di->interval = msecs_to_jiffies(4 * 1000);
 610
 611         di->bat_num = pdata->bat_num;
 612         di->dc_check_pin = pdata->dc_check_pin;
 613
 614         if (pdata->init_dc_check_pin)
 615                 pdata->init_dc_check_pin( );
 616
 617         bq27510_powersupply_init(di);
 618
 619         retval = power_supply_register(&client->dev, &di->bat);
 620         if (retval) {
 621                 dev_err(&client->dev, "failed to register battery\n");
 622                 goto batt_failed_4;
 623         }
 624         bq27510_di = di;
 625         retval = power_supply_register(&client->dev, &di->ac);
 626         if (retval) {
 627                 dev_err(&client->dev, "failed to register ac\n");
 628                 goto batt_failed_4;
 629         }
 630         INIT_DELAYED_WORK(&di->work, bq27510_battery_work);
 631         schedule_delayed_work(&di->work, di->interval);
 632         dev_info(&client->dev, "support ver. %s enabled\n", DRIVER_VERSION);
 633         return 0;
 634
 635 batt_failed_4:
 636         kfree(di);
 637 batt_failed_2:
 638         return retval;
 639 }
 640
 641 static int bq27510_battery_remove(struct i2c_client *client)
 642 {
 643         struct bq27510_device_info *di = i2c_get_clientdata(client);
 644
 645         power_supply_unregister(&di->bat);
 646         kfree(di->bat.name);
 647         kfree(di);
 648         return 0;
 649 }
 650
 651 static const struct i2c_device_id bq27510_id[] = {
 652         { "bq27510", 0 },
 653 };
 654
 655 static struct i2c_driver bq27510_battery_driver = {
 656         .driver = {
 657                 .name = "bq27510",
 658         },
 659         .probe = bq27510_battery_probe,
 660         .remove = bq27510_battery_remove,
 661         .id_table = bq27510_id,
 662 };
 663
 664 static int __init bq27510_battery_init(void)
 665 {
 666         int ret;
 667         struct proc_dir_entry * battery_proc_entry;
 668
 669         ret = i2c_add_driver(&bq27510_battery_driver);
 670         if (ret)
 671                 printk(KERN_ERR "Unable to register BQ27510 driver\n");
 672
 673         battery_proc_entry = proc_create("driver/power",0777,NULL,&battery_proc_fops);
 674         return ret;
 675 }
 676 module_init(bq27510_battery_init);
 677
 678 static void __exit bq27510_battery_exit(void)
 679 {
 680         i2c_del_driver(&bq27510_battery_driver);
 681 }
 682 module_exit(bq27510_battery_exit);
 683
 684 MODULE_AUTHOR("Rockchip");
 685 MODULE_DESCRIPTION("BQ27510 battery monitor driver");
 686 MODULE_LICENSE("GPL");