Version:  2.0.40 2.2.26 2.4.37 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17

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

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