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Linux/drivers/power/bq27x00_battery.c

  1 /*
  2  * BQ27x00 battery driver
  3  *
  4  * Copyright (C) 2008 Rodolfo Giometti <giometti@linux.it>
  5  * Copyright (C) 2008 Eurotech S.p.A. <info@eurotech.it>
  6  * Copyright (C) 2010-2011 Lars-Peter Clausen <lars@metafoo.de>
  7  * Copyright (C) 2011 Pali Rohár <pali.rohar@gmail.com>
  8  *
  9  * Based on a previous work by Copyright (C) 2008 Texas Instruments, Inc.
 10  *
 11  * This package is free software; you can redistribute it and/or modify
 12  * it under the terms of the GNU General Public License version 2 as
 13  * published by the Free Software Foundation.
 14  *
 15  * THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 16  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 17  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 18  *
 19  */
 20 
 21 /*
 22  * Datasheets:
 23  * http://focus.ti.com/docs/prod/folders/print/bq27000.html
 24  * http://focus.ti.com/docs/prod/folders/print/bq27500.html
 25  * http://www.ti.com/product/bq27425-g1
 26  */
 27 
 28 #include <linux/module.h>
 29 #include <linux/param.h>
 30 #include <linux/jiffies.h>
 31 #include <linux/workqueue.h>
 32 #include <linux/delay.h>
 33 #include <linux/platform_device.h>
 34 #include <linux/power_supply.h>
 35 #include <linux/idr.h>
 36 #include <linux/i2c.h>
 37 #include <linux/slab.h>
 38 #include <asm/unaligned.h>
 39 
 40 #include <linux/power/bq27x00_battery.h>
 41 
 42 #define DRIVER_VERSION                  "1.2.0"
 43 
 44 #define BQ27x00_REG_TEMP                0x06
 45 #define BQ27x00_REG_VOLT                0x08
 46 #define BQ27x00_REG_AI                  0x14
 47 #define BQ27x00_REG_FLAGS               0x0A
 48 #define BQ27x00_REG_TTE                 0x16
 49 #define BQ27x00_REG_TTF                 0x18
 50 #define BQ27x00_REG_TTECP               0x26
 51 #define BQ27x00_REG_NAC                 0x0C /* Nominal available capacity */
 52 #define BQ27x00_REG_LMD                 0x12 /* Last measured discharge */
 53 #define BQ27x00_REG_CYCT                0x2A /* Cycle count total */
 54 #define BQ27x00_REG_AE                  0x22 /* Available energy */
 55 #define BQ27x00_POWER_AVG               0x24
 56 
 57 #define BQ27000_REG_RSOC                0x0B /* Relative State-of-Charge */
 58 #define BQ27000_REG_ILMD                0x76 /* Initial last measured discharge */
 59 #define BQ27000_FLAG_EDVF               BIT(0) /* Final End-of-Discharge-Voltage flag */
 60 #define BQ27000_FLAG_EDV1               BIT(1) /* First End-of-Discharge-Voltage flag */
 61 #define BQ27000_FLAG_CI                 BIT(4) /* Capacity Inaccurate flag */
 62 #define BQ27000_FLAG_FC                 BIT(5)
 63 #define BQ27000_FLAG_CHGS               BIT(7) /* Charge state flag */
 64 
 65 #define BQ27500_REG_SOC                 0x2C
 66 #define BQ27500_REG_DCAP                0x3C /* Design capacity */
 67 #define BQ27500_FLAG_DSC                BIT(0)
 68 #define BQ27500_FLAG_SOCF               BIT(1) /* State-of-Charge threshold final */
 69 #define BQ27500_FLAG_SOC1               BIT(2) /* State-of-Charge threshold 1 */
 70 #define BQ27500_FLAG_FC                 BIT(9)
 71 #define BQ27500_FLAG_OTC                BIT(15)
 72 
 73 /* bq27425 register addresses are same as bq27x00 addresses minus 4 */
 74 #define BQ27425_REG_OFFSET              0x04
 75 #define BQ27425_REG_SOC                 0x18 /* Register address plus offset */
 76 
 77 #define BQ27000_RS                      20 /* Resistor sense */
 78 #define BQ27x00_POWER_CONSTANT          (256 * 29200 / 1000)
 79 
 80 struct bq27x00_device_info;
 81 struct bq27x00_access_methods {
 82         int (*read)(struct bq27x00_device_info *di, u8 reg, bool single);
 83 };
 84 
 85 enum bq27x00_chip { BQ27000, BQ27500, BQ27425};
 86 
 87 struct bq27x00_reg_cache {
 88         int temperature;
 89         int time_to_empty;
 90         int time_to_empty_avg;
 91         int time_to_full;
 92         int charge_full;
 93         int cycle_count;
 94         int capacity;
 95         int energy;
 96         int flags;
 97         int power_avg;
 98         int health;
 99 };
100 
101 struct bq27x00_device_info {
102         struct device           *dev;
103         int                     id;
104         enum bq27x00_chip       chip;
105 
106         struct bq27x00_reg_cache cache;
107         int charge_design_full;
108 
109         unsigned long last_update;
110         struct delayed_work work;
111 
112         struct power_supply     bat;
113 
114         struct bq27x00_access_methods bus;
115 
116         struct mutex lock;
117 };
118 
119 static enum power_supply_property bq27x00_battery_props[] = {
120         POWER_SUPPLY_PROP_STATUS,
121         POWER_SUPPLY_PROP_PRESENT,
122         POWER_SUPPLY_PROP_VOLTAGE_NOW,
123         POWER_SUPPLY_PROP_CURRENT_NOW,
124         POWER_SUPPLY_PROP_CAPACITY,
125         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
126         POWER_SUPPLY_PROP_TEMP,
127         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
128         POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
129         POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
130         POWER_SUPPLY_PROP_TECHNOLOGY,
131         POWER_SUPPLY_PROP_CHARGE_FULL,
132         POWER_SUPPLY_PROP_CHARGE_NOW,
133         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
134         POWER_SUPPLY_PROP_CYCLE_COUNT,
135         POWER_SUPPLY_PROP_ENERGY_NOW,
136         POWER_SUPPLY_PROP_POWER_AVG,
137         POWER_SUPPLY_PROP_HEALTH,
138 };
139 
140 static enum power_supply_property bq27425_battery_props[] = {
141         POWER_SUPPLY_PROP_STATUS,
142         POWER_SUPPLY_PROP_PRESENT,
143         POWER_SUPPLY_PROP_VOLTAGE_NOW,
144         POWER_SUPPLY_PROP_CURRENT_NOW,
145         POWER_SUPPLY_PROP_CAPACITY,
146         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
147         POWER_SUPPLY_PROP_TEMP,
148         POWER_SUPPLY_PROP_TECHNOLOGY,
149         POWER_SUPPLY_PROP_CHARGE_FULL,
150         POWER_SUPPLY_PROP_CHARGE_NOW,
151         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
152 };
153 
154 static unsigned int poll_interval = 360;
155 module_param(poll_interval, uint, 0644);
156 MODULE_PARM_DESC(poll_interval, "battery poll interval in seconds - " \
157                                 "0 disables polling");
158 
159 /*
160  * Common code for BQ27x00 devices
161  */
162 
163 static inline int bq27x00_read(struct bq27x00_device_info *di, u8 reg,
164                 bool single)
165 {
166         if (di->chip == BQ27425)
167                 return di->bus.read(di, reg - BQ27425_REG_OFFSET, single);
168         return di->bus.read(di, reg, single);
169 }
170 
171 /*
172  * Higher versions of the chip like BQ27425 and BQ27500
173  * differ from BQ27000 and BQ27200 in calculation of certain
174  * parameters. Hence we need to check for the chip type.
175  */
176 static bool bq27xxx_is_chip_version_higher(struct bq27x00_device_info *di)
177 {
178         if (di->chip == BQ27425 || di->chip == BQ27500)
179                 return true;
180         return false;
181 }
182 
183 /*
184  * Return the battery Relative State-of-Charge
185  * Or < 0 if something fails.
186  */
187 static int bq27x00_battery_read_rsoc(struct bq27x00_device_info *di)
188 {
189         int rsoc;
190 
191         if (di->chip == BQ27500)
192                 rsoc = bq27x00_read(di, BQ27500_REG_SOC, false);
193         else if (di->chip == BQ27425)
194                 rsoc = bq27x00_read(di, BQ27425_REG_SOC, false);
195         else
196                 rsoc = bq27x00_read(di, BQ27000_REG_RSOC, true);
197 
198         if (rsoc < 0)
199                 dev_dbg(di->dev, "error reading relative State-of-Charge\n");
200 
201         return rsoc;
202 }
203 
204 /*
205  * Return a battery charge value in µAh
206  * Or < 0 if something fails.
207  */
208 static int bq27x00_battery_read_charge(struct bq27x00_device_info *di, u8 reg)
209 {
210         int charge;
211 
212         charge = bq27x00_read(di, reg, false);
213         if (charge < 0) {
214                 dev_dbg(di->dev, "error reading charge register %02x: %d\n",
215                         reg, charge);
216                 return charge;
217         }
218 
219         if (bq27xxx_is_chip_version_higher(di))
220                 charge *= 1000;
221         else
222                 charge = charge * 3570 / BQ27000_RS;
223 
224         return charge;
225 }
226 
227 /*
228  * Return the battery Nominal available capaciy in µAh
229  * Or < 0 if something fails.
230  */
231 static inline int bq27x00_battery_read_nac(struct bq27x00_device_info *di)
232 {
233         int flags;
234         bool is_bq27500 = di->chip == BQ27500;
235         bool is_higher = bq27xxx_is_chip_version_higher(di);
236 
237         flags = bq27x00_read(di, BQ27x00_REG_FLAGS, !is_bq27500);
238         if (flags >= 0 && !is_higher && (flags & BQ27000_FLAG_CI))
239                 return -ENODATA;
240 
241         return bq27x00_battery_read_charge(di, BQ27x00_REG_NAC);
242 }
243 
244 /*
245  * Return the battery Last measured discharge in µAh
246  * Or < 0 if something fails.
247  */
248 static inline int bq27x00_battery_read_lmd(struct bq27x00_device_info *di)
249 {
250         return bq27x00_battery_read_charge(di, BQ27x00_REG_LMD);
251 }
252 
253 /*
254  * Return the battery Initial last measured discharge in µAh
255  * Or < 0 if something fails.
256  */
257 static int bq27x00_battery_read_ilmd(struct bq27x00_device_info *di)
258 {
259         int ilmd;
260 
261         if (bq27xxx_is_chip_version_higher(di))
262                 ilmd = bq27x00_read(di, BQ27500_REG_DCAP, false);
263         else
264                 ilmd = bq27x00_read(di, BQ27000_REG_ILMD, true);
265 
266         if (ilmd < 0) {
267                 dev_dbg(di->dev, "error reading initial last measured discharge\n");
268                 return ilmd;
269         }
270 
271         if (bq27xxx_is_chip_version_higher(di))
272                 ilmd *= 1000;
273         else
274                 ilmd = ilmd * 256 * 3570 / BQ27000_RS;
275 
276         return ilmd;
277 }
278 
279 /*
280  * Return the battery Available energy in µWh
281  * Or < 0 if something fails.
282  */
283 static int bq27x00_battery_read_energy(struct bq27x00_device_info *di)
284 {
285         int ae;
286 
287         ae = bq27x00_read(di, BQ27x00_REG_AE, false);
288         if (ae < 0) {
289                 dev_dbg(di->dev, "error reading available energy\n");
290                 return ae;
291         }
292 
293         if (di->chip == BQ27500)
294                 ae *= 1000;
295         else
296                 ae = ae * 29200 / BQ27000_RS;
297 
298         return ae;
299 }
300 
301 /*
302  * Return the battery temperature in tenths of degree Kelvin
303  * Or < 0 if something fails.
304  */
305 static int bq27x00_battery_read_temperature(struct bq27x00_device_info *di)
306 {
307         int temp;
308 
309         temp = bq27x00_read(di, BQ27x00_REG_TEMP, false);
310         if (temp < 0) {
311                 dev_err(di->dev, "error reading temperature\n");
312                 return temp;
313         }
314 
315         if (!bq27xxx_is_chip_version_higher(di))
316                 temp = 5 * temp / 2;
317 
318         return temp;
319 }
320 
321 /*
322  * Return the battery Cycle count total
323  * Or < 0 if something fails.
324  */
325 static int bq27x00_battery_read_cyct(struct bq27x00_device_info *di)
326 {
327         int cyct;
328 
329         cyct = bq27x00_read(di, BQ27x00_REG_CYCT, false);
330         if (cyct < 0)
331                 dev_err(di->dev, "error reading cycle count total\n");
332 
333         return cyct;
334 }
335 
336 /*
337  * Read a time register.
338  * Return < 0 if something fails.
339  */
340 static int bq27x00_battery_read_time(struct bq27x00_device_info *di, u8 reg)
341 {
342         int tval;
343 
344         tval = bq27x00_read(di, reg, false);
345         if (tval < 0) {
346                 dev_dbg(di->dev, "error reading time register %02x: %d\n",
347                         reg, tval);
348                 return tval;
349         }
350 
351         if (tval == 65535)
352                 return -ENODATA;
353 
354         return tval * 60;
355 }
356 
357 /*
358  * Read a power avg register.
359  * Return < 0 if something fails.
360  */
361 static int bq27x00_battery_read_pwr_avg(struct bq27x00_device_info *di, u8 reg)
362 {
363         int tval;
364 
365         tval = bq27x00_read(di, reg, false);
366         if (tval < 0) {
367                 dev_err(di->dev, "error reading power avg rgister  %02x: %d\n",
368                         reg, tval);
369                 return tval;
370         }
371 
372         if (di->chip == BQ27500)
373                 return tval;
374         else
375                 return (tval * BQ27x00_POWER_CONSTANT) / BQ27000_RS;
376 }
377 
378 /*
379  * Read flag register.
380  * Return < 0 if something fails.
381  */
382 static int bq27x00_battery_read_health(struct bq27x00_device_info *di)
383 {
384         int tval;
385 
386         tval = bq27x00_read(di, BQ27x00_REG_FLAGS, false);
387         if (tval < 0) {
388                 dev_err(di->dev, "error reading flag register:%d\n", tval);
389                 return tval;
390         }
391 
392         if ((di->chip == BQ27500)) {
393                 if (tval & BQ27500_FLAG_SOCF)
394                         tval = POWER_SUPPLY_HEALTH_DEAD;
395                 else if (tval & BQ27500_FLAG_OTC)
396                         tval = POWER_SUPPLY_HEALTH_OVERHEAT;
397                 else
398                         tval = POWER_SUPPLY_HEALTH_GOOD;
399                 return tval;
400         } else {
401                 if (tval & BQ27000_FLAG_EDV1)
402                         tval = POWER_SUPPLY_HEALTH_DEAD;
403                 else
404                         tval = POWER_SUPPLY_HEALTH_GOOD;
405                 return tval;
406         }
407 
408         return -1;
409 }
410 
411 static void bq27x00_update(struct bq27x00_device_info *di)
412 {
413         struct bq27x00_reg_cache cache = {0, };
414         bool is_bq27500 = di->chip == BQ27500;
415         bool is_bq27425 = di->chip == BQ27425;
416 
417         cache.flags = bq27x00_read(di, BQ27x00_REG_FLAGS, !is_bq27500);
418         if (cache.flags >= 0) {
419                 if (!is_bq27500 && !is_bq27425
420                                 && (cache.flags & BQ27000_FLAG_CI)) {
421                         dev_info(di->dev, "battery is not calibrated! ignoring capacity values\n");
422                         cache.capacity = -ENODATA;
423                         cache.energy = -ENODATA;
424                         cache.time_to_empty = -ENODATA;
425                         cache.time_to_empty_avg = -ENODATA;
426                         cache.time_to_full = -ENODATA;
427                         cache.charge_full = -ENODATA;
428                         cache.health = -ENODATA;
429                 } else {
430                         cache.capacity = bq27x00_battery_read_rsoc(di);
431                         if (!is_bq27425) {
432                                 cache.energy = bq27x00_battery_read_energy(di);
433                                 cache.time_to_empty =
434                                         bq27x00_battery_read_time(di,
435                                                         BQ27x00_REG_TTE);
436                                 cache.time_to_empty_avg =
437                                         bq27x00_battery_read_time(di,
438                                                         BQ27x00_REG_TTECP);
439                                 cache.time_to_full =
440                                         bq27x00_battery_read_time(di,
441                                                         BQ27x00_REG_TTF);
442                         }
443                         cache.charge_full = bq27x00_battery_read_lmd(di);
444                         cache.health = bq27x00_battery_read_health(di);
445                 }
446                 cache.temperature = bq27x00_battery_read_temperature(di);
447                 if (!is_bq27425)
448                         cache.cycle_count = bq27x00_battery_read_cyct(di);
449                 cache.power_avg =
450                         bq27x00_battery_read_pwr_avg(di, BQ27x00_POWER_AVG);
451 
452                 /* We only have to read charge design full once */
453                 if (di->charge_design_full <= 0)
454                         di->charge_design_full = bq27x00_battery_read_ilmd(di);
455         }
456 
457         if (memcmp(&di->cache, &cache, sizeof(cache)) != 0) {
458                 di->cache = cache;
459                 power_supply_changed(&di->bat);
460         }
461 
462         di->last_update = jiffies;
463 }
464 
465 static void bq27x00_battery_poll(struct work_struct *work)
466 {
467         struct bq27x00_device_info *di =
468                 container_of(work, struct bq27x00_device_info, work.work);
469 
470         bq27x00_update(di);
471 
472         if (poll_interval > 0) {
473                 /* The timer does not have to be accurate. */
474                 set_timer_slack(&di->work.timer, poll_interval * HZ / 4);
475                 schedule_delayed_work(&di->work, poll_interval * HZ);
476         }
477 }
478 
479 /*
480  * Return the battery average current in µA
481  * Note that current can be negative signed as well
482  * Or 0 if something fails.
483  */
484 static int bq27x00_battery_current(struct bq27x00_device_info *di,
485         union power_supply_propval *val)
486 {
487         int curr;
488         int flags;
489 
490         curr = bq27x00_read(di, BQ27x00_REG_AI, false);
491         if (curr < 0) {
492                 dev_err(di->dev, "error reading current\n");
493                 return curr;
494         }
495 
496         if (bq27xxx_is_chip_version_higher(di)) {
497                 /* bq27500 returns signed value */
498                 val->intval = (int)((s16)curr) * 1000;
499         } else {
500                 flags = bq27x00_read(di, BQ27x00_REG_FLAGS, false);
501                 if (flags & BQ27000_FLAG_CHGS) {
502                         dev_dbg(di->dev, "negative current!\n");
503                         curr = -curr;
504                 }
505 
506                 val->intval = curr * 3570 / BQ27000_RS;
507         }
508 
509         return 0;
510 }
511 
512 static int bq27x00_battery_status(struct bq27x00_device_info *di,
513         union power_supply_propval *val)
514 {
515         int status;
516 
517         if (bq27xxx_is_chip_version_higher(di)) {
518                 if (di->cache.flags & BQ27500_FLAG_FC)
519                         status = POWER_SUPPLY_STATUS_FULL;
520                 else if (di->cache.flags & BQ27500_FLAG_DSC)
521                         status = POWER_SUPPLY_STATUS_DISCHARGING;
522                 else
523                         status = POWER_SUPPLY_STATUS_CHARGING;
524         } else {
525                 if (di->cache.flags & BQ27000_FLAG_FC)
526                         status = POWER_SUPPLY_STATUS_FULL;
527                 else if (di->cache.flags & BQ27000_FLAG_CHGS)
528                         status = POWER_SUPPLY_STATUS_CHARGING;
529                 else if (power_supply_am_i_supplied(&di->bat))
530                         status = POWER_SUPPLY_STATUS_NOT_CHARGING;
531                 else
532                         status = POWER_SUPPLY_STATUS_DISCHARGING;
533         }
534 
535         val->intval = status;
536 
537         return 0;
538 }
539 
540 static int bq27x00_battery_capacity_level(struct bq27x00_device_info *di,
541         union power_supply_propval *val)
542 {
543         int level;
544 
545         if (bq27xxx_is_chip_version_higher(di)) {
546                 if (di->cache.flags & BQ27500_FLAG_FC)
547                         level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
548                 else if (di->cache.flags & BQ27500_FLAG_SOC1)
549                         level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
550                 else if (di->cache.flags & BQ27500_FLAG_SOCF)
551                         level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
552                 else
553                         level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
554         } else {
555                 if (di->cache.flags & BQ27000_FLAG_FC)
556                         level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
557                 else if (di->cache.flags & BQ27000_FLAG_EDV1)
558                         level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
559                 else if (di->cache.flags & BQ27000_FLAG_EDVF)
560                         level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
561                 else
562                         level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
563         }
564 
565         val->intval = level;
566 
567         return 0;
568 }
569 
570 /*
571  * Return the battery Voltage in millivolts
572  * Or < 0 if something fails.
573  */
574 static int bq27x00_battery_voltage(struct bq27x00_device_info *di,
575         union power_supply_propval *val)
576 {
577         int volt;
578 
579         volt = bq27x00_read(di, BQ27x00_REG_VOLT, false);
580         if (volt < 0) {
581                 dev_err(di->dev, "error reading voltage\n");
582                 return volt;
583         }
584 
585         val->intval = volt * 1000;
586 
587         return 0;
588 }
589 
590 static int bq27x00_simple_value(int value,
591         union power_supply_propval *val)
592 {
593         if (value < 0)
594                 return value;
595 
596         val->intval = value;
597 
598         return 0;
599 }
600 
601 #define to_bq27x00_device_info(x) container_of((x), \
602                                 struct bq27x00_device_info, bat);
603 
604 static int bq27x00_battery_get_property(struct power_supply *psy,
605                                         enum power_supply_property psp,
606                                         union power_supply_propval *val)
607 {
608         int ret = 0;
609         struct bq27x00_device_info *di = to_bq27x00_device_info(psy);
610 
611         mutex_lock(&di->lock);
612         if (time_is_before_jiffies(di->last_update + 5 * HZ)) {
613                 cancel_delayed_work_sync(&di->work);
614                 bq27x00_battery_poll(&di->work.work);
615         }
616         mutex_unlock(&di->lock);
617 
618         if (psp != POWER_SUPPLY_PROP_PRESENT && di->cache.flags < 0)
619                 return -ENODEV;
620 
621         switch (psp) {
622         case POWER_SUPPLY_PROP_STATUS:
623                 ret = bq27x00_battery_status(di, val);
624                 break;
625         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
626                 ret = bq27x00_battery_voltage(di, val);
627                 break;
628         case POWER_SUPPLY_PROP_PRESENT:
629                 val->intval = di->cache.flags < 0 ? 0 : 1;
630                 break;
631         case POWER_SUPPLY_PROP_CURRENT_NOW:
632                 ret = bq27x00_battery_current(di, val);
633                 break;
634         case POWER_SUPPLY_PROP_CAPACITY:
635                 ret = bq27x00_simple_value(di->cache.capacity, val);
636                 break;
637         case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
638                 ret = bq27x00_battery_capacity_level(di, val);
639                 break;
640         case POWER_SUPPLY_PROP_TEMP:
641                 ret = bq27x00_simple_value(di->cache.temperature, val);
642                 if (ret == 0)
643                         val->intval -= 2731;
644                 break;
645         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
646                 ret = bq27x00_simple_value(di->cache.time_to_empty, val);
647                 break;
648         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
649                 ret = bq27x00_simple_value(di->cache.time_to_empty_avg, val);
650                 break;
651         case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
652                 ret = bq27x00_simple_value(di->cache.time_to_full, val);
653                 break;
654         case POWER_SUPPLY_PROP_TECHNOLOGY:
655                 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
656                 break;
657         case POWER_SUPPLY_PROP_CHARGE_NOW:
658                 ret = bq27x00_simple_value(bq27x00_battery_read_nac(di), val);
659                 break;
660         case POWER_SUPPLY_PROP_CHARGE_FULL:
661                 ret = bq27x00_simple_value(di->cache.charge_full, val);
662                 break;
663         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
664                 ret = bq27x00_simple_value(di->charge_design_full, val);
665                 break;
666         case POWER_SUPPLY_PROP_CYCLE_COUNT:
667                 ret = bq27x00_simple_value(di->cache.cycle_count, val);
668                 break;
669         case POWER_SUPPLY_PROP_ENERGY_NOW:
670                 ret = bq27x00_simple_value(di->cache.energy, val);
671                 break;
672         case POWER_SUPPLY_PROP_POWER_AVG:
673                 ret = bq27x00_simple_value(di->cache.power_avg, val);
674                 break;
675         case POWER_SUPPLY_PROP_HEALTH:
676                 ret = bq27x00_simple_value(di->cache.health, val);
677                 break;
678         default:
679                 return -EINVAL;
680         }
681 
682         return ret;
683 }
684 
685 static void bq27x00_external_power_changed(struct power_supply *psy)
686 {
687         struct bq27x00_device_info *di = to_bq27x00_device_info(psy);
688 
689         cancel_delayed_work_sync(&di->work);
690         schedule_delayed_work(&di->work, 0);
691 }
692 
693 static int bq27x00_powersupply_init(struct bq27x00_device_info *di)
694 {
695         int ret;
696 
697         di->bat.type = POWER_SUPPLY_TYPE_BATTERY;
698         if (di->chip == BQ27425) {
699                 di->bat.properties = bq27425_battery_props;
700                 di->bat.num_properties = ARRAY_SIZE(bq27425_battery_props);
701         } else {
702                 di->bat.properties = bq27x00_battery_props;
703                 di->bat.num_properties = ARRAY_SIZE(bq27x00_battery_props);
704         }
705         di->bat.get_property = bq27x00_battery_get_property;
706         di->bat.external_power_changed = bq27x00_external_power_changed;
707 
708         INIT_DELAYED_WORK(&di->work, bq27x00_battery_poll);
709         mutex_init(&di->lock);
710 
711         ret = power_supply_register(di->dev, &di->bat);
712         if (ret) {
713                 dev_err(di->dev, "failed to register battery: %d\n", ret);
714                 return ret;
715         }
716 
717         dev_info(di->dev, "support ver. %s enabled\n", DRIVER_VERSION);
718 
719         bq27x00_update(di);
720 
721         return 0;
722 }
723 
724 static void bq27x00_powersupply_unregister(struct bq27x00_device_info *di)
725 {
726         /*
727          * power_supply_unregister call bq27x00_battery_get_property which
728          * call bq27x00_battery_poll.
729          * Make sure that bq27x00_battery_poll will not call
730          * schedule_delayed_work again after unregister (which cause OOPS).
731          */
732         poll_interval = 0;
733 
734         cancel_delayed_work_sync(&di->work);
735 
736         power_supply_unregister(&di->bat);
737 
738         mutex_destroy(&di->lock);
739 }
740 
741 
742 /* i2c specific code */
743 #ifdef CONFIG_BATTERY_BQ27X00_I2C
744 
745 /* If the system has several batteries we need a different name for each
746  * of them...
747  */
748 static DEFINE_IDR(battery_id);
749 static DEFINE_MUTEX(battery_mutex);
750 
751 static int bq27x00_read_i2c(struct bq27x00_device_info *di, u8 reg, bool single)
752 {
753         struct i2c_client *client = to_i2c_client(di->dev);
754         struct i2c_msg msg[2];
755         unsigned char data[2];
756         int ret;
757 
758         if (!client->adapter)
759                 return -ENODEV;
760 
761         msg[0].addr = client->addr;
762         msg[0].flags = 0;
763         msg[0].buf = &reg;
764         msg[0].len = sizeof(reg);
765         msg[1].addr = client->addr;
766         msg[1].flags = I2C_M_RD;
767         msg[1].buf = data;
768         if (single)
769                 msg[1].len = 1;
770         else
771                 msg[1].len = 2;
772 
773         ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
774         if (ret < 0)
775                 return ret;
776 
777         if (!single)
778                 ret = get_unaligned_le16(data);
779         else
780                 ret = data[0];
781 
782         return ret;
783 }
784 
785 static int bq27x00_battery_probe(struct i2c_client *client,
786                                  const struct i2c_device_id *id)
787 {
788         char *name;
789         struct bq27x00_device_info *di;
790         int num;
791         int retval = 0;
792 
793         /* Get new ID for the new battery device */
794         mutex_lock(&battery_mutex);
795         num = idr_alloc(&battery_id, client, 0, 0, GFP_KERNEL);
796         mutex_unlock(&battery_mutex);
797         if (num < 0)
798                 return num;
799 
800         name = kasprintf(GFP_KERNEL, "%s-%d", id->name, num);
801         if (!name) {
802                 dev_err(&client->dev, "failed to allocate device name\n");
803                 retval = -ENOMEM;
804                 goto batt_failed_1;
805         }
806 
807         di = kzalloc(sizeof(*di), GFP_KERNEL);
808         if (!di) {
809                 dev_err(&client->dev, "failed to allocate device info data\n");
810                 retval = -ENOMEM;
811                 goto batt_failed_2;
812         }
813 
814         di->id = num;
815         di->dev = &client->dev;
816         di->chip = id->driver_data;
817         di->bat.name = name;
818         di->bus.read = &bq27x00_read_i2c;
819 
820         retval = bq27x00_powersupply_init(di);
821         if (retval)
822                 goto batt_failed_3;
823 
824         i2c_set_clientdata(client, di);
825 
826         return 0;
827 
828 batt_failed_3:
829         kfree(di);
830 batt_failed_2:
831         kfree(name);
832 batt_failed_1:
833         mutex_lock(&battery_mutex);
834         idr_remove(&battery_id, num);
835         mutex_unlock(&battery_mutex);
836 
837         return retval;
838 }
839 
840 static int bq27x00_battery_remove(struct i2c_client *client)
841 {
842         struct bq27x00_device_info *di = i2c_get_clientdata(client);
843 
844         bq27x00_powersupply_unregister(di);
845 
846         kfree(di->bat.name);
847 
848         mutex_lock(&battery_mutex);
849         idr_remove(&battery_id, di->id);
850         mutex_unlock(&battery_mutex);
851 
852         kfree(di);
853 
854         return 0;
855 }
856 
857 static const struct i2c_device_id bq27x00_id[] = {
858         { "bq27200", BQ27000 }, /* bq27200 is same as bq27000, but with i2c */
859         { "bq27500", BQ27500 },
860         { "bq27425", BQ27425 },
861         {},
862 };
863 MODULE_DEVICE_TABLE(i2c, bq27x00_id);
864 
865 static struct i2c_driver bq27x00_battery_driver = {
866         .driver = {
867                 .name = "bq27x00-battery",
868         },
869         .probe = bq27x00_battery_probe,
870         .remove = bq27x00_battery_remove,
871         .id_table = bq27x00_id,
872 };
873 
874 static inline int bq27x00_battery_i2c_init(void)
875 {
876         int ret = i2c_add_driver(&bq27x00_battery_driver);
877         if (ret)
878                 printk(KERN_ERR "Unable to register BQ27x00 i2c driver\n");
879 
880         return ret;
881 }
882 
883 static inline void bq27x00_battery_i2c_exit(void)
884 {
885         i2c_del_driver(&bq27x00_battery_driver);
886 }
887 
888 #else
889 
890 static inline int bq27x00_battery_i2c_init(void) { return 0; }
891 static inline void bq27x00_battery_i2c_exit(void) {};
892 
893 #endif
894 
895 /* platform specific code */
896 #ifdef CONFIG_BATTERY_BQ27X00_PLATFORM
897 
898 static int bq27000_read_platform(struct bq27x00_device_info *di, u8 reg,
899                         bool single)
900 {
901         struct device *dev = di->dev;
902         struct bq27000_platform_data *pdata = dev->platform_data;
903         unsigned int timeout = 3;
904         int upper, lower;
905         int temp;
906 
907         if (!single) {
908                 /* Make sure the value has not changed in between reading the
909                  * lower and the upper part */
910                 upper = pdata->read(dev, reg + 1);
911                 do {
912                         temp = upper;
913                         if (upper < 0)
914                                 return upper;
915 
916                         lower = pdata->read(dev, reg);
917                         if (lower < 0)
918                                 return lower;
919 
920                         upper = pdata->read(dev, reg + 1);
921                 } while (temp != upper && --timeout);
922 
923                 if (timeout == 0)
924                         return -EIO;
925 
926                 return (upper << 8) | lower;
927         }
928 
929         return pdata->read(dev, reg);
930 }
931 
932 static int bq27000_battery_probe(struct platform_device *pdev)
933 {
934         struct bq27x00_device_info *di;
935         struct bq27000_platform_data *pdata = pdev->dev.platform_data;
936         int ret;
937 
938         if (!pdata) {
939                 dev_err(&pdev->dev, "no platform_data supplied\n");
940                 return -EINVAL;
941         }
942 
943         if (!pdata->read) {
944                 dev_err(&pdev->dev, "no hdq read callback supplied\n");
945                 return -EINVAL;
946         }
947 
948         di = kzalloc(sizeof(*di), GFP_KERNEL);
949         if (!di) {
950                 dev_err(&pdev->dev, "failed to allocate device info data\n");
951                 return -ENOMEM;
952         }
953 
954         platform_set_drvdata(pdev, di);
955 
956         di->dev = &pdev->dev;
957         di->chip = BQ27000;
958 
959         di->bat.name = pdata->name ?: dev_name(&pdev->dev);
960         di->bus.read = &bq27000_read_platform;
961 
962         ret = bq27x00_powersupply_init(di);
963         if (ret)
964                 goto err_free;
965 
966         return 0;
967 
968 err_free:
969         kfree(di);
970 
971         return ret;
972 }
973 
974 static int bq27000_battery_remove(struct platform_device *pdev)
975 {
976         struct bq27x00_device_info *di = platform_get_drvdata(pdev);
977 
978         bq27x00_powersupply_unregister(di);
979 
980         kfree(di);
981 
982         return 0;
983 }
984 
985 static struct platform_driver bq27000_battery_driver = {
986         .probe  = bq27000_battery_probe,
987         .remove = bq27000_battery_remove,
988         .driver = {
989                 .name = "bq27000-battery",
990                 .owner = THIS_MODULE,
991         },
992 };
993 
994 static inline int bq27x00_battery_platform_init(void)
995 {
996         int ret = platform_driver_register(&bq27000_battery_driver);
997         if (ret)
998                 printk(KERN_ERR "Unable to register BQ27000 platform driver\n");
999 
1000         return ret;
1001 }
1002 
1003 static inline void bq27x00_battery_platform_exit(void)
1004 {
1005         platform_driver_unregister(&bq27000_battery_driver);
1006 }
1007 
1008 #else
1009 
1010 static inline int bq27x00_battery_platform_init(void) { return 0; }
1011 static inline void bq27x00_battery_platform_exit(void) {};
1012 
1013 #endif
1014 
1015 /*
1016  * Module stuff
1017  */
1018 
1019 static int __init bq27x00_battery_init(void)
1020 {
1021         int ret;
1022 
1023         ret = bq27x00_battery_i2c_init();
1024         if (ret)
1025                 return ret;
1026 
1027         ret = bq27x00_battery_platform_init();
1028         if (ret)
1029                 bq27x00_battery_i2c_exit();
1030 
1031         return ret;
1032 }
1033 module_init(bq27x00_battery_init);
1034 
1035 static void __exit bq27x00_battery_exit(void)
1036 {
1037         bq27x00_battery_platform_exit();
1038         bq27x00_battery_i2c_exit();
1039 }
1040 module_exit(bq27x00_battery_exit);
1041 
1042 MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
1043 MODULE_DESCRIPTION("BQ27x00 battery monitor driver");
1044 MODULE_LICENSE("GPL");
1045 

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