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
  26 #define DRIVER_VERSION                  "1.1.0"
  27
  28 #define BQ27x00_REG_TEMP                0x06
  29 #define BQ27x00_REG_VOLT                0x08
  30 #define BQ27x00_REG_AI                  0x14
  31 #define BQ27x00_REG_FLAGS               0x0A
  32 #define BQ27x00_REG_TTE                 0x16
  33 #define BQ27x00_REG_TTF                 0x18
  34 #define BQ27x00_REG_TTECP               0x26
  35
  36 #define BQ27000_REG_RSOC                0x0B /* Relative State-of-Charge */
  37 #define BQ27000_FLAG_CHGS               BIT(7)
  38
  39 #define BQ27500_REG_SOC                 0x2c
  40 #define BQ27500_FLAG_DSC                BIT(0)
  41 #define BQ27500_FLAG_FC                 BIT(9)
  42
  43 #define BQ27510_SPEED                   300 * 1000
  44
  45 #define DC_CHECK_PIN                    RK29_PIN4_PA1
  46
  47 #if 0
  48 #define DBG(x...) printk(KERN_INFO x)
  49 #else
  50 #define DBG(x...) do { } while (0)
  51 #endif
  52
  53 /* If the system has several batteries we need a different name for each
  54  * of them...
  55  */
  56 static DEFINE_MUTEX(battery_mutex);
  57
  58 struct bq27510_device_info {
  59         struct device           *dev;
  60         struct power_supply     bat;
  61         ///struct power_supply  ac;
  62         struct delayed_work work;
  63         unsigned int interval;
  64         struct i2c_client       *client;
  65 };
  66
  67 static enum power_supply_property bq27510_battery_props[] = {
  68         POWER_SUPPLY_PROP_STATUS,
  69         POWER_SUPPLY_PROP_PRESENT,
  70         POWER_SUPPLY_PROP_VOLTAGE_NOW,
  71         POWER_SUPPLY_PROP_CURRENT_NOW,
  72         POWER_SUPPLY_PROP_CAPACITY,
  73         POWER_SUPPLY_PROP_TEMP,
  74         //POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
  75         //POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
  76         //POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
  77 };
  78
  79 static enum power_supply_property rk29_ac_props[] = {
  80         POWER_SUPPLY_PROP_ONLINE,
  81 };
  82
  83
  84 /*
  85  * Common code for BQ27510 devices read
  86  */
  87 static int bq27510_read(struct i2c_client *client, u8 reg, u8 buf[], unsigned len)
  88 {
  89         int ret;
  90         ret = i2c_master_reg8_recv(client, reg, buf, len, BQ27510_SPEED);
  91         return ret;
  92 }
  93 #ifdef CONFIG_CHECK_BATT_CAPACITY
  94 static int bq27510_write(struct i2c_client *client, u8 reg, u8 const buf[], unsigned len)
  95 {
  96         int ret;
  97         ret = i2c_master_reg8_send(client, reg, buf, (int)len, BQ27510_SPEED);
  98         return ret;
  99 }
 100 #endif
 101 /*
 102  * Return the battery temperature in tenths of degree Celsius
 103  * Or < 0 if something fails.
 104  */
 105 static int bq27510_battery_temperature(struct bq27510_device_info *di)
 106 {
 107         int ret;
 108         int temp = 0;
 109         u8 buf[2];
 110         ret = bq27510_read(di->client,BQ27x00_REG_TEMP,buf,2);
 111         if (ret<0) {
 112                 dev_err(di->dev, "error reading temperature\n");
 113                 return ret;
 114         }
 115         temp = get_unaligned_le16(buf);
 116         temp = temp - 2731;
 117         DBG("Enter:%s %d--temp = %d\n",__FUNCTION__,__LINE__,temp);
 118         return temp;
 119 }
 120
 121 /*
 122  * Return the battery Voltage in milivolts
 123  * Or < 0 if something fails.
 124  */
 125 static int bq27510_battery_voltage(struct bq27510_device_info *di)
 126 {
 127         int ret;
 128         u8 buf[2];
 129         int volt = 0;
 130
 131         ret = bq27510_read(di->client,BQ27x00_REG_VOLT,buf,2);
 132         if (ret<0) {
 133                 dev_err(di->dev, "error reading voltage\n");
 134                 return ret;
 135         }
 136         volt = get_unaligned_le16(buf);
 137         volt = volt * 1000;
 138         DBG("Enter:%s %d--volt = %d\n",__FUNCTION__,__LINE__,volt);
 139         return volt;
 140 }
 141
 142 /*
 143  * Return the battery average current
 144  * Note that current can be negative signed as well
 145  * Or 0 if something fails.
 146  */
 147 static int bq27510_battery_current(struct bq27510_device_info *di)
 148 {
 149         int ret;
 150         int curr = 0;
 151         u8 buf[2];
 152
 153         ret = bq27510_read(di->client,BQ27x00_REG_AI,buf,2);
 154         if (ret<0) {
 155                 dev_err(di->dev, "error reading current\n");
 156                 return 0;
 157         }
 158
 159         curr = get_unaligned_le16(buf);
 160         if(curr>0x8000){
 161                 curr = 0xFFFF^(curr-1);
 162         }
 163         curr = curr * 1000;
 164         DBG("Enter:%s %d--curr = %d\n",__FUNCTION__,__LINE__,curr);
 165         return curr;
 166 }
 167
 168 /*
 169  * Return the battery Relative State-of-Charge
 170  * Or < 0 if something fails.
 171  */
 172 static int bq27510_battery_rsoc(struct bq27510_device_info *di)
 173 {
 174         int ret;
 175         int rsoc = 0;
 176         #if 0
 177         int nvcap = 0,facap = 0,remcap=0,fccap=0,full=0,cnt=0;
 178         #endif
 179         u8 buf[2];
 180
 181         ret = bq27510_read(di->client,BQ27500_REG_SOC,buf,2);
 182         if (ret<0) {
 183                 dev_err(di->dev, "error reading relative State-of-Charge\n");
 184                 return ret;
 185         }
 186         rsoc = get_unaligned_le16(buf);
 187         DBG("Enter:%s %d--rsoc = %d\n",__FUNCTION__,__LINE__,rsoc);
 188         #if CONFIG_NO_BATTERY_IC
 189         rsoc = 100;
 190         #endif
 191         #if 0
 192         ret = bq27510_read(di->client,0x0c,buf,2);
 193         nvcap = get_unaligned_le16(buf);
 194         DBG("Enter:%s %d--nvcap = %d\n",__FUNCTION__,__LINE__,nvcap);
 195         ret = bq27510_read(di->client,0x0e,buf,2);
 196         facap = get_unaligned_le16(buf);
 197         DBG("Enter:%s %d--facap = %d\n",__FUNCTION__,__LINE__,facap);
 198         ret = bq27510_read(di->client,0x10,buf,2);
 199         remcap = get_unaligned_le16(buf);
 200         DBG("Enter:%s %d--remcap = %d\n",__FUNCTION__,__LINE__,remcap);
 201         ret = bq27510_read(di->client,0x12,buf,2);
 202         fccap = get_unaligned_le16(buf);
 203         DBG("Enter:%s %d--fccap = %d\n",__FUNCTION__,__LINE__,fccap);
 204         ret = bq27510_read(di->client,0x3c,buf,2);
 205         full = get_unaligned_le16(buf);
 206         DBG("Enter:%s %d--full = %d\n",__FUNCTION__,__LINE__,full);
 207         ret = bq27510_read(di->client,0x00,buf,2);
 208         cnt = get_unaligned_le16(buf);
 209         DBG("Enter:%s %d--full = %d\n",__FUNCTION__,__LINE__,cnt);
 210         #endif
 211         return rsoc;
 212 }
 213
 214 static int bq27510_battery_status(struct bq27510_device_info *di,
 215                                   union power_supply_propval *val)
 216 {
 217         u8 buf[2];
 218         int flags = 0;
 219         int status;
 220         int ret;
 221
 222         ret = bq27510_read(di->client,BQ27x00_REG_FLAGS, buf, 2);
 223         if (ret < 0) {
 224                 dev_err(di->dev, "error reading flags\n");
 225                 return ret;
 226         }
 227         flags = get_unaligned_le16(buf);
 228         if (flags & BQ27500_FLAG_FC)
 229                 status = POWER_SUPPLY_STATUS_FULL;
 230         else if (flags & BQ27500_FLAG_DSC)
 231                 status = POWER_SUPPLY_STATUS_DISCHARGING;
 232         else
 233                 status = POWER_SUPPLY_STATUS_CHARGING;
 234
 235         val->intval = status;
 236         return 0;
 237 }
 238
 239 /*
 240  * Read a time register.
 241  * Return < 0 if something fails.
 242  */
 243 static int bq27510_battery_time(struct bq27510_device_info *di, int reg,
 244                                 union power_supply_propval *val)
 245 {
 246         u8 buf[2];
 247         int tval = 0;
 248         int ret;
 249
 250         ret = bq27510_read(di->client,reg,buf,2);
 251         if (ret<0) {
 252                 dev_err(di->dev, "error reading register %02x\n", reg);
 253                 return ret;
 254         }
 255         tval = get_unaligned_le16(buf);
 256         DBG("Enter:%s %d--tval=%d\n",__FUNCTION__,__LINE__,tval);
 257         if (tval == 65535)
 258                 return -ENODATA;
 259
 260         val->intval = tval * 60;
 261         DBG("Enter:%s %d val->intval = %d\n",__FUNCTION__,__LINE__,val->intval);
 262         return 0;
 263 }
 264
 265 #define to_bq27510_device_info(x) container_of((x), \
 266                                 struct bq27510_device_info, bat);
 267
 268 static int bq27510_battery_get_property(struct power_supply *psy,
 269                                         enum power_supply_property psp,
 270                                         union power_supply_propval *val)
 271 {
 272         int ret = 0;
 273         struct bq27510_device_info *di = to_bq27510_device_info(psy);
 274
 275         switch (psp) {
 276         case POWER_SUPPLY_PROP_STATUS:
 277                 ret = bq27510_battery_status(di, val);
 278                 break;
 279         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 280         case POWER_SUPPLY_PROP_PRESENT:
 281                 val->intval = bq27510_battery_voltage(di);
 282                 if (psp == POWER_SUPPLY_PROP_PRESENT)
 283                         val->intval = val->intval <= 0 ? 0 : 1;
 284                 break;
 285         case POWER_SUPPLY_PROP_CURRENT_NOW:
 286                 val->intval = bq27510_battery_current(di);
 287                 break;
 288         case POWER_SUPPLY_PROP_CAPACITY:
 289                 val->intval = bq27510_battery_rsoc(di);
 290                 break;
 291         case POWER_SUPPLY_PROP_TEMP:
 292                 val->intval = bq27510_battery_temperature(di);
 293                 break;
 294         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
 295                 ret = bq27510_battery_time(di, BQ27x00_REG_TTE, val);
 296                 break;
 297         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
 298                 ret = bq27510_battery_time(di, BQ27x00_REG_TTECP, val);
 299                 break;
 300         case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
 301                 ret = bq27510_battery_time(di, BQ27x00_REG_TTF, val);
 302                 break;
 303         default:
 304                 return -EINVAL;
 305         }
 306
 307         return ret;
 308 }
 309
 310 static int rk29_ac_get_property(struct power_supply *psy,
 311                         enum power_supply_property psp,
 312                         union power_supply_propval *val)
 313 {
 314         int ret = 0;
 315         switch (psp) {
 316         case POWER_SUPPLY_PROP_ONLINE:
 317                 if (psy->type == POWER_SUPPLY_TYPE_MAINS){
 318                         if(gpio_get_value(DC_CHECK_PIN))
 319                                 val->intval = 0;
 320                         else
 321                                 val->intval = 1;
 322                 }
 323                 DBG("%s:%d val->intval = %d\n",__FUNCTION__,__LINE__,val->intval);
 324                 break;
 325
 326         default:
 327                 ret = -EINVAL;
 328                 break;
 329         }
 330         return ret;
 331 }
 332
 333 static void bq27510_powersupply_init(struct bq27510_device_info *di)
 334 {
 335         di->bat.type = POWER_SUPPLY_TYPE_BATTERY;
 336         di->bat.properties = bq27510_battery_props;
 337         di->bat.num_properties = ARRAY_SIZE(bq27510_battery_props);
 338         di->bat.get_property = bq27510_battery_get_property;
 339
 340         /*di->ac.type = POWER_SUPPLY_TYPE_MAINS;
 341         di->ac.properties = rk29_ac_props;
 342         di->ac.num_properties = ARRAY_SIZE(rk29_ac_props);
 343         di->ac.get_property = rk29_ac_get_property;*/
 344 }
 345
 346
 347 static void bq27510_battery_update_status(struct bq27510_device_info *di)
 348 {
 349         power_supply_changed(&di->bat);
 350 }
 351
 352 static void bq27510_battery_work(struct work_struct *work)
 353 {
 354         struct bq27510_device_info *di = container_of(work, struct bq27510_device_info, work.work);
 355         bq27510_battery_update_status(di);
 356         /* reschedule for the next time */
 357         schedule_delayed_work(&di->work, di->interval);
 358 }
 359
 360 static int bq27510_battery_probe(struct i2c_client *client,
 361                                  const struct i2c_device_id *id)
 362 {
 363         struct bq27510_device_info *di;
 364         int retval = 0;
 365
 366         #ifdef CONFIG_CHECK_BATT_CAPACITY
 367         u8 buf[2];
 368         #endif
 369
 370         di = kzalloc(sizeof(*di), GFP_KERNEL);
 371         if (!di) {
 372                 dev_err(&client->dev, "failed to allocate device info data\n");
 373                 retval = -ENOMEM;
 374                 goto batt_failed_2;
 375         }
 376         i2c_set_clientdata(client, di);
 377         di->dev = &client->dev;
 378         di->bat.name = "bq27510-battery";
 379         di->client = client;
 380         /* 4 seconds between monotor runs interval */
 381         di->interval = msecs_to_jiffies(4 * 1000);
 382
 383         gpio_request(DC_CHECK_PIN,"dc_check");
 384         gpio_direction_input(DC_CHECK_PIN);
 385         bq27510_powersupply_init(di);
 386         #ifdef CONFIG_CHECK_BATT_CAPACITY
 387         buf[0] = 0x41;
 388         buf[1] = 0x00;
 389         bq27510_write(di->client,0x00,buf,2);
 390         buf[0] = 0x21;
 391         buf[1] = 0x00;
 392         bq27510_write(di->client,0x00,buf,2);
 393         #endif
 394         retval = power_supply_register(&client->dev, &di->bat);
 395         if (retval) {
 396                 dev_err(&client->dev, "failed to register battery\n");
 397                 goto batt_failed_4;
 398         }
 399         INIT_DELAYED_WORK(&di->work, bq27510_battery_work);
 400         schedule_delayed_work(&di->work, di->interval);
 401         dev_info(&client->dev, "support ver. %s enabled\n", DRIVER_VERSION);
 402
 403         return 0;
 404
 405 batt_failed_4:
 406         kfree(di);
 407 batt_failed_2:
 408         return retval;
 409 }
 410
 411 static int bq27510_battery_remove(struct i2c_client *client)
 412 {
 413         struct bq27510_device_info *di = i2c_get_clientdata(client);
 414
 415         power_supply_unregister(&di->bat);
 416         kfree(di->bat.name);
 417         kfree(di);
 418         return 0;
 419 }
 420
 421 /*
 422  * Module stuff
 423  */
 424
 425 static const struct i2c_device_id bq27510_id[] = {
 426         { "bq27510", 0 },
 427 };
 428
 429 static struct i2c_driver bq27510_battery_driver = {
 430         .driver = {
 431                 .name = "bq27510-battery",
 432         },
 433         .probe = bq27510_battery_probe,
 434         .remove = bq27510_battery_remove,
 435         .id_table = bq27510_id,
 436 };
 437
 438 static int __init bq27510_battery_init(void)
 439 {
 440         int ret;
 441
 442         ret = i2c_add_driver(&bq27510_battery_driver);
 443         if (ret)
 444                 printk(KERN_ERR "Unable to register BQ27510 driver\n");
 445         return ret;
 446 }
 447 module_init(bq27510_battery_init);
 448
 449 static void __exit bq27510_battery_exit(void)
 450 {
 451         i2c_del_driver(&bq27510_battery_driver);
 452 }
 453 module_exit(bq27510_battery_exit);
 454
 455 MODULE_AUTHOR("Rockchip");
 456 MODULE_DESCRIPTION("BQ27510 battery monitor driver");
 457 MODULE_LICENSE("GPL");