drivers/power/bq27541_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                   100 * 1000
  48 int  virtual_battery_enable = 0;
  49 extern int dwc_vbus_status(void);
  50 static void bq27541_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 bq27541_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 bq27541_device_info *bq27541_di;
  75 static enum power_supply_property bq27541_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                          unsigned long count,void *data)
  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         if(c == '1')
 106                 virtual_battery_enable = 1;
 107         else if(c == '2')
 108                 virtual_battery_enable = 2;
 109         else if(c == '3')
 110                 virtual_battery_enable = 3;
 111         else if(c == '9'){
 112                 printk("%s:%d>>bq27541 set\n",__FUNCTION__,__LINE__);
 113                 bq27541_set();
 114         }
 115         else
 116                 virtual_battery_enable = 0;
 117         printk("%s,count(%d),virtual_battery_enable(%d)\n",__FUNCTION__,(int)count,virtual_battery_enable);
 118         return count;
 119 }
 120
 121 static const struct file_operations battery_proc_fops = {
 122         .owner          = THIS_MODULE,
 123         .write          = battery_proc_write,
 124 };
 125
 126 /*
 127  * Common code for BQ27510 devices read
 128  */
 129 static int bq27541_read(struct i2c_client *client, u8 reg, u8 buf[], unsigned len)
 130 {
 131         int ret;
 132         ret = i2c_master_reg8_recv(client, reg, buf, len, BQ27510_SPEED);
 133         return ret;
 134 }
 135
 136 static int bq27541_write(struct i2c_client *client, u8 reg, u8 const buf[], unsigned len)
 137 {
 138         int ret;
 139         ret = i2c_master_reg8_send(client, reg, buf, (int)len, BQ27510_SPEED);
 140         return ret;
 141 }
 142
 143 /*
 144  * Return the battery temperature in tenths of degree Celsius
 145  * Or < 0 if something fails.
 146  */
 147 static int bq27541_battery_temperature(struct bq27541_device_info *di)
 148 {
 149         int ret;
 150         int temp = 0;
 151         u8 buf[2] ={0};
 152
 153         #if defined (CONFIG_NO_BATTERY_IC)
 154         return 258;
 155         #endif
 156
 157         if(virtual_battery_enable == 1)
 158                 return 125/*258*/;
 159         ret = bq27541_read(di->client,BQ27x00_REG_TEMP,buf,2);
 160         if (ret<0) {
 161                 dev_err(di->dev, "error reading temperature\n");
 162                 return ret;
 163         }
 164         temp = get_unaligned_le16(buf);
 165         temp = temp - 2731;  //K
 166         DBG("Enter:%s %d--temp = %d\n",__FUNCTION__,__LINE__,temp);
 167         return temp;
 168 }
 169
 170 /*
 171  * Return the battery Voltage in milivolts
 172  * Or < 0 if something fails.
 173  */
 174 static int bq27541_battery_voltage(struct bq27541_device_info *di)
 175 {
 176         int ret;
 177         u8 buf[2] = {0};
 178         int volt = 0;
 179
 180         #if defined (CONFIG_NO_BATTERY_IC)
 181                 return 4000000;
 182         #endif
 183         if(virtual_battery_enable == 1)
 184                 return 2000000/*4000000*/;
 185
 186         ret = bq27541_read(di->client,BQ27x00_REG_VOLT,buf,2);
 187         if (ret<0) {
 188                 dev_err(di->dev, "error reading voltage\n");
 189                 return ret;
 190         }
 191         volt = get_unaligned_le16(buf);
 192
 193         //bp27510 can only measure one li-lion bat
 194         if(di->bat_num == 2){
 195                 volt = volt * 1000 * 2;
 196         }else{
 197                 volt = volt * 1000;
 198         }
 199
 200         DBG("Enter:%s %d--volt = %d\n",__FUNCTION__,__LINE__,volt);
 201         return volt;
 202 }
 203
 204 /*
 205  * Return the battery average current
 206  * Note that current can be negative signed as well
 207  * Or 0 if something fails.
 208  */
 209 static int bq27541_battery_current(struct bq27541_device_info *di)
 210 {
 211         int ret;
 212         int curr = 0;
 213         u8 buf[2] = {0};
 214
 215         #if defined (CONFIG_NO_BATTERY_IC)
 216                 return 22000;
 217         #endif
 218         if(virtual_battery_enable == 1)
 219                 return 11000/*22000*/;
 220         ret = bq27541_read(di->client,BQ27x00_REG_AI,buf,2);
 221         if (ret<0) {
 222                 dev_err(di->dev, "error reading current\n");
 223                 return 0;
 224         }
 225
 226         curr = get_unaligned_le16(buf);
 227         DBG("curr = %x \n",curr);
 228         if(curr>0x8000){
 229                 curr = 0xFFFF^(curr-1);
 230         }
 231         curr = curr * 1000;
 232         DBG("Enter:%s %d--curr = %d\n",__FUNCTION__,__LINE__,curr);
 233         return curr;
 234 }
 235
 236 /*
 237  * Return the battery Relative State-of-Charge
 238  * Or < 0 if something fails.
 239  */
 240 static int bq27541_battery_rsoc(struct bq27541_device_info *di)
 241 {
 242         int ret;
 243         int rsoc = 0;
 244         #if 0
 245         int nvcap = 0,facap = 0,remcap=0,fccap=0,full=0,cnt=0;
 246         int art = 0, artte = 0, ai = 0, tte = 0, ttf = 0, si = 0;
 247         int stte = 0, mli = 0, mltte = 0, ae = 0, ap = 0, ttecp = 0, cc = 0;
 248         #endif
 249         u8 buf[2];
 250
 251         #if defined (CONFIG_NO_BATTERY_IC)
 252                 return 100;
 253         #endif
 254         if(virtual_battery_enable == 1)
 255                 return 50/*100*/;
 256
 257         ret = bq27541_read(di->client,BQ27500_REG_SOC,buf,2);
 258         if (ret<0) {
 259                 dev_err(di->dev, "error reading relative State-of-Charge\n");
 260                 return ret;
 261         }
 262         rsoc = get_unaligned_le16(buf);
 263         DBG("Enter:%s %d--rsoc = %d\n",__FUNCTION__,__LINE__,rsoc);
 264
 265         #if defined (CONFIG_NO_BATTERY_IC)
 266         rsoc = 100;
 267         #endif
 268         #if 0     //other register information, for debug use
 269         ret = bq27541_read(di->client,0x0c,buf,2);              //NominalAvailableCapacity
 270         nvcap = get_unaligned_le16(buf);
 271         DBG("\nEnter:%s %d--nvcap = %d\n",__FUNCTION__,__LINE__,nvcap);
 272         ret = bq27541_read(di->client,0x0e,buf,2);              //FullAvailableCapacity
 273         facap = get_unaligned_le16(buf);
 274         DBG("Enter:%s %d--facap = %d\n",__FUNCTION__,__LINE__,facap);
 275         ret = bq27541_read(di->client,0x10,buf,2);              //RemainingCapacity
 276         remcap = get_unaligned_le16(buf);
 277         DBG("Enter:%s %d--remcap = %d\n",__FUNCTION__,__LINE__,remcap);
 278         ret = bq27541_read(di->client,0x12,buf,2);              //FullChargeCapacity
 279         fccap = get_unaligned_le16(buf);
 280         DBG("Enter:%s %d--fccap = %d\n",__FUNCTION__,__LINE__,fccap);
 281         ret = bq27541_read(di->client,0x3c,buf,2);              //DesignCapacity
 282         full = get_unaligned_le16(buf);
 283         DBG("Enter:%s %d--DesignCapacity = %d\n",__FUNCTION__,__LINE__,full);
 284
 285         buf[0] = 0x00;                                          //CONTROL_STATUS
 286         buf[1] = 0x00;
 287         bq27541_write(di->client,0x00,buf,2);
 288         ret = bq27541_read(di->client,0x00,buf,2);
 289         cnt = get_unaligned_le16(buf);
 290         DBG("Enter:%s %d--Control status = %x\n",__FUNCTION__,__LINE__,cnt);
 291
 292         ret = bq27541_read(di->client,0x02,buf,2);              //AtRate
 293         art = get_unaligned_le16(buf);
 294         DBG("Enter:%s %d--AtRate = %d\n",__FUNCTION__,__LINE__,art);
 295         ret = bq27541_read(di->client,0x04,buf,2);              //AtRateTimeToEmpty
 296         artte = get_unaligned_le16(buf);
 297         DBG("Enter:%s %d--AtRateTimeToEmpty = %d\n",__FUNCTION__,__LINE__,artte);
 298         ret = bq27541_read(di->client,0x14,buf,2);              //AverageCurrent
 299         ai = get_unaligned_le16(buf);
 300         DBG("Enter:%s %d--AverageCurrent = %d\n",__FUNCTION__,__LINE__,ai);
 301         ret = bq27541_read(di->client,0x16,buf,2);              //TimeToEmpty
 302         tte = get_unaligned_le16(buf);
 303         DBG("Enter:%s %d--TimeToEmpty = %d\n",__FUNCTION__,__LINE__,tte);
 304         ret = bq27541_read(di->client,0x18,buf,2);              //TimeToFull
 305         ttf = get_unaligned_le16(buf);
 306         DBG("Enter:%s %d--TimeToFull = %d\n",__FUNCTION__,__LINE__,ttf);
 307         ret = bq27541_read(di->client,0x1a,buf,2);              //StandbyCurrent
 308         si = get_unaligned_le16(buf);
 309         DBG("Enter:%s %d--StandbyCurrent = %d\n",__FUNCTION__,__LINE__,si);
 310         ret = bq27541_read(di->client,0x1c,buf,2);              //StandbyTimeToEmpty
 311         stte = get_unaligned_le16(buf);
 312         DBG("Enter:%s %d--StandbyTimeToEmpty = %d\n",__FUNCTION__,__LINE__,stte);
 313         ret = bq27541_read(di->client,0x1e,buf,2);              //MaxLoadCurrent
 314         mli = get_unaligned_le16(buf);
 315         DBG("Enter:%s %d--MaxLoadCurrent = %d\n",__FUNCTION__,__LINE__,mli);
 316         ret = bq27541_read(di->client,0x20,buf,2);              //MaxLoadTimeToEmpty
 317         mltte = get_unaligned_le16(buf);
 318         DBG("Enter:%s %d--MaxLoadTimeToEmpty = %d\n",__FUNCTION__,__LINE__,mltte);
 319         ret = bq27541_read(di->client,0x22,buf,2);              //AvailableEnergy
 320         ae = get_unaligned_le16(buf);
 321         DBG("Enter:%s %d--AvailableEnergy = %d\n",__FUNCTION__,__LINE__,ae);
 322         ret = bq27541_read(di->client,0x24,buf,2);              //AveragePower
 323         ap = get_unaligned_le16(buf);
 324         DBG("Enter:%s %d--AveragePower = %d\n",__FUNCTION__,__LINE__,ap);
 325         ret = bq27541_read(di->client,0x26,buf,2);              //TTEatConstantPower
 326         ttecp = get_unaligned_le16(buf);
 327         DBG("Enter:%s %d--TTEatConstantPower = %d\n",__FUNCTION__,__LINE__,ttecp);
 328         ret = bq27541_read(di->client,0x2a,buf,2);              //CycleCount
 329         cc = get_unaligned_le16(buf);
 330         DBG("Enter:%s %d--CycleCount = %d\n",__FUNCTION__,__LINE__,cc);
 331         #endif
 332         return rsoc;
 333 }
 334
 335 static int bq27541_battery_status(struct bq27541_device_info *di,
 336                                   union power_supply_propval *val)
 337 {
 338         u8 buf[2] = {0};
 339         int flags = 0;
 340         int status = 0;
 341         int ret = 0;
 342
 343         #if defined (CONFIG_NO_BATTERY_IC)
 344                 val->intval = POWER_SUPPLY_STATUS_FULL;
 345         return 0;
 346         #endif
 347
 348         if(virtual_battery_enable == 1)
 349         {
 350                 val->intval = POWER_SUPPLY_STATUS_FULL;
 351                 return 0;
 352         }
 353         ret = bq27541_read(di->client,BQ27x00_REG_FLAGS, buf, 2);
 354         if (ret < 0) {
 355                 dev_err(di->dev, "error reading flags\n");
 356                 return ret;
 357         }
 358         flags = get_unaligned_le16(buf);
 359         DBG("Enter:%s %d--status = %x\n",__FUNCTION__,__LINE__,flags);
 360         if (flags & BQ27500_FLAG_FC)
 361                 status = POWER_SUPPLY_STATUS_FULL;
 362         else if (flags & BQ27500_FLAG_DSC)
 363                 status = POWER_SUPPLY_STATUS_DISCHARGING;
 364         else
 365                 status = POWER_SUPPLY_STATUS_CHARGING;
 366
 367         val->intval = status;
 368         return 0;
 369 }
 370
 371 static int bq27541_health_status(struct bq27541_device_info *di,
 372                                   union power_supply_propval *val)
 373 {
 374         u8 buf[2] = {0};
 375         int flags = 0;
 376         int status;
 377         int ret;
 378
 379         #if defined (CONFIG_NO_BATTERY_IC)
 380                 val->intval = POWER_SUPPLY_HEALTH_GOOD;
 381         return 0;
 382         #endif
 383
 384         if(virtual_battery_enable == 1)
 385         {
 386                 val->intval = POWER_SUPPLY_HEALTH_GOOD;
 387                 return 0;
 388         }
 389         ret = bq27541_read(di->client,BQ27x00_REG_FLAGS, buf, 2);
 390         if (ret < 0) {
 391                 dev_err(di->dev, "error reading flags\n");
 392                 return ret;
 393         }
 394         flags = get_unaligned_le16(buf);
 395         DBG("Enter:%s %d--status = %x\n",__FUNCTION__,__LINE__,flags);
 396
 397         if ((flags & BQ27500_FLAG_OTD)||(flags & BQ27500_FLAG_OTC))
 398                 status = POWER_SUPPLY_HEALTH_OVERHEAT;
 399         else
 400                 status = POWER_SUPPLY_HEALTH_GOOD;
 401
 402
 403
 404         val->intval = status;
 405         return 0;
 406 }
 407
 408
 409 /*
 410  * Read a time register.
 411  * Return < 0 if something fails.
 412  */
 413 static int bq27541_battery_time(struct bq27541_device_info *di, int reg,
 414                                 union power_supply_propval *val)
 415 {
 416         u8 buf[2] = {0};
 417         int tval = 0;
 418         int ret;
 419
 420         ret = bq27541_read(di->client,reg,buf,2);
 421         if (ret<0) {
 422                 dev_err(di->dev, "error reading register %02x\n", reg);
 423                 return ret;
 424         }
 425         tval = get_unaligned_le16(buf);
 426         DBG("Enter:%s %d--tval=%d\n",__FUNCTION__,__LINE__,tval);
 427         if (tval == 65535)
 428                 return -ENODATA;
 429
 430         val->intval = tval * 60;
 431         DBG("Enter:%s %d val->intval = %d\n",__FUNCTION__,__LINE__,val->intval);
 432         return 0;
 433 }
 434
 435 #define to_bq27541_device_info(x) container_of((x), \
 436                                 struct bq27541_device_info, bat);
 437
 438 static int bq27541_battery_get_property(struct power_supply *psy,
 439                                         enum power_supply_property psp,
 440                                         union power_supply_propval *val)
 441 {
 442         int ret = 0;
 443         struct bq27541_device_info *di = to_bq27541_device_info(psy);
 444         DBG("Enter:%s %d psp= %d\n",__FUNCTION__,__LINE__,psp);
 445
 446         switch (psp) {
 447
 448         case POWER_SUPPLY_PROP_STATUS:
 449                 ret = bq27541_battery_status(di, val);
 450                 break;
 451         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 452         case POWER_SUPPLY_PROP_PRESENT:
 453                 val->intval = bq27541_battery_voltage(di);
 454                 if (psp == POWER_SUPPLY_PROP_PRESENT)
 455                         val->intval = val->intval <= 0 ? 0 : 1;
 456                 break;
 457         case POWER_SUPPLY_PROP_CURRENT_NOW:
 458                 val->intval = bq27541_battery_current(di);
 459                 break;
 460         case POWER_SUPPLY_PROP_CAPACITY:
 461                 val->intval = bq27541_battery_rsoc(di);
 462                 break;
 463
 464         case POWER_SUPPLY_PROP_TEMP:
 465                 val->intval = bq27541_battery_temperature(di);
 466                 break;
 467
 468         case POWER_SUPPLY_PROP_TECHNOLOGY:
 469                 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
 470                 break;
 471         case POWER_SUPPLY_PROP_HEALTH:
 472                 ret = bq27541_health_status(di, val);
 473                 break;
 474         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
 475                 ret = bq27541_battery_time(di, BQ27x00_REG_TTE, val);
 476                 break;
 477         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
 478                 ret = bq27541_battery_time(di, BQ27x00_REG_TTECP, val);
 479                 break;
 480         case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
 481                 ret = bq27541_battery_time(di, BQ27x00_REG_TTF, val);
 482                 break;
 483
 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 bq27541_device_info *di = container_of(psy, struct bq27541_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 bq27541_powersupply_init(struct bq27541_device_info *di)
 517 {
 518         di->bat.type = POWER_SUPPLY_TYPE_BATTERY;
 519         di->bat.properties = bq27541_battery_props;
 520         di->bat.num_properties = ARRAY_SIZE(bq27541_battery_props);
 521         di->bat.get_property = bq27541_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 bq27541_battery_update_status(struct bq27541_device_info *di)
 532 {
 533         power_supply_changed(&di->bat);
 534 }
 535
 536 static void bq27541_battery_work(struct work_struct *work)
 537 {
 538         struct bq27541_device_info *di = container_of(work, struct bq27541_device_info, work.work);
 539         bq27541_battery_update_status(di);
 540         /* reschedule for the next time */
 541         schedule_delayed_work(&di->work, di->interval);
 542 }
 543
 544 static void bq27541_set(void)
 545 {
 546         struct bq27541_device_info *di;
 547         int i = 0;
 548         u8 buf[2];
 549
 550         di = bq27541_di;
 551         printk("enter 0x41\n");
 552         buf[0] = 0x41;
 553         buf[1] = 0x00;
 554         bq27541_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         bq27541_write(di->client,0x00,buf,2);
 562
 563         buf[0] = 0;
 564         buf[1] = 0;
 565         bq27541_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                 bq27541_write(di->client,0x00,buf,2);
 576
 577                 buf[0] = 0;
 578                 buf[1] = 0;
 579                 bq27541_read(di->client,0x00,buf,2);
 580                 i++;
 581         }
 582
 583         if(i>5)
 584                 printk("write 0x21 error\n");
 585         else
 586                 printk("bq27541 write 0x21 success\n");
 587 }
 588
 589 static int bq27541_battery_probe(struct i2c_client *client,
 590                                  const struct i2c_device_id *id)
 591 {
 592         struct bq27541_device_info *di;
 593         int retval = 0;
 594         struct bq27541_platform_data *pdata;
 595
 596         DBG("**********  bq27541_battery_probe**************  ");
 597         pdata = client->dev.platform_data;
 598
 599         di = kzalloc(sizeof(*di), GFP_KERNEL);
 600         if (!di) {
 601                 dev_err(&client->dev, "failed to allocate device info data\n");
 602                 retval = -ENOMEM;
 603                 goto batt_failed_2;
 604         }
 605         i2c_set_clientdata(client, di);
 606         di->dev = &client->dev;
 607         di->bat.name = "bq27541-battery";
 608         di->client = client;
 609         /* 4 seconds between monotor runs interval */
 610         di->interval = msecs_to_jiffies(4 * 1000);
 611
 612         di->bat_num = pdata->bat_num;
 613         di->dc_check_pin = pdata->dc_check_pin;
 614
 615         if (pdata->init_dc_check_pin)
 616                 pdata->init_dc_check_pin( );
 617
 618         bq27541_powersupply_init(di);
 619
 620         retval = power_supply_register(&client->dev, &di->bat);
 621         if (retval) {
 622                 dev_err(&client->dev, "failed to register battery\n");
 623                 goto batt_failed_4;
 624         }
 625         bq27541_di = di;
 626         retval = power_supply_register(&client->dev, &di->ac);
 627         if (retval) {
 628                 dev_err(&client->dev, "failed to register ac\n");
 629                 goto batt_failed_4;
 630         }
 631         INIT_DELAYED_WORK(&di->work, bq27541_battery_work);
 632         schedule_delayed_work(&di->work, di->interval);
 633         dev_info(&client->dev, "support ver. %s enabled\n", DRIVER_VERSION);
 634         return 0;
 635
 636 batt_failed_4:
 637         kfree(di);
 638 batt_failed_2:
 639         return retval;
 640 }
 641
 642 static int bq27541_battery_remove(struct i2c_client *client)
 643 {
 644         struct bq27541_device_info *di = i2c_get_clientdata(client);
 645
 646         power_supply_unregister(&di->bat);
 647         kfree(di->bat.name);
 648         kfree(di);
 649         return 0;
 650 }
 651
 652 static const struct i2c_device_id bq27541_id[] = {
 653         { "bq27541", 0 },
 654 };
 655
 656 static struct i2c_driver bq27541_battery_driver = {
 657         .driver = {
 658                 .name = "bq27541",
 659         },
 660         .probe = bq27541_battery_probe,
 661         .remove = bq27541_battery_remove,
 662         .id_table = bq27541_id,
 663 };
 664
 665 static int __init bq27541_battery_init(void)
 666 {
 667         int ret;
 668         struct proc_dir_entry * battery_proc_entry;
 669
 670         ret = i2c_add_driver(&bq27541_battery_driver);
 671         if (ret)
 672                 printk(KERN_ERR "Unable to register BQ27541 driver\n");
 673
 674         battery_proc_entry = proc_create("driver/power",0777,NULL,&battery_proc_fops);
 675         return ret;
 676 }
 677 module_init(bq27541_battery_init);
 678
 679 static void __exit bq27541_battery_exit(void)
 680 {
 681         i2c_del_driver(&bq27541_battery_driver);
 682 }
 683 module_exit(bq27541_battery_exit);
 684
 685 MODULE_AUTHOR("clb");
 686 MODULE_DESCRIPTION("BQ27541 battery monitor driver");
 687 MODULE_LICENSE("GPL");