Version:  2.0.40 2.2.26 2.4.37 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 3.18 3.19 4.0

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  * http://www.ti.com/product/BQ27742-G1
 27  */
 28 
 29 #include <linux/device.h>
 30 #include <linux/module.h>
 31 #include <linux/param.h>
 32 #include <linux/jiffies.h>
 33 #include <linux/workqueue.h>
 34 #include <linux/delay.h>
 35 #include <linux/platform_device.h>
 36 #include <linux/power_supply.h>
 37 #include <linux/idr.h>
 38 #include <linux/i2c.h>
 39 #include <linux/slab.h>
 40 #include <asm/unaligned.h>
 41 
 42 #include <linux/power/bq27x00_battery.h>
 43 
 44 #define DRIVER_VERSION                  "1.2.0"
 45 
 46 #define BQ27x00_REG_TEMP                0x06
 47 #define BQ27x00_REG_VOLT                0x08
 48 #define BQ27x00_REG_AI                  0x14
 49 #define BQ27x00_REG_FLAGS               0x0A
 50 #define BQ27x00_REG_TTE                 0x16
 51 #define BQ27x00_REG_TTF                 0x18
 52 #define BQ27x00_REG_TTECP               0x26
 53 #define BQ27x00_REG_NAC                 0x0C /* Nominal available capacity */
 54 #define BQ27x00_REG_LMD                 0x12 /* Last measured discharge */
 55 #define BQ27x00_REG_CYCT                0x2A /* Cycle count total */
 56 #define BQ27x00_REG_AE                  0x22 /* Available energy */
 57 #define BQ27x00_POWER_AVG               0x24
 58 
 59 #define BQ27000_REG_RSOC                0x0B /* Relative State-of-Charge */
 60 #define BQ27000_REG_ILMD                0x76 /* Initial last measured discharge */
 61 #define BQ27000_FLAG_EDVF               BIT(0) /* Final End-of-Discharge-Voltage flag */
 62 #define BQ27000_FLAG_EDV1               BIT(1) /* First End-of-Discharge-Voltage flag */
 63 #define BQ27000_FLAG_CI                 BIT(4) /* Capacity Inaccurate flag */
 64 #define BQ27000_FLAG_FC                 BIT(5)
 65 #define BQ27000_FLAG_CHGS               BIT(7) /* Charge state flag */
 66 
 67 #define BQ27500_REG_SOC                 0x2C
 68 #define BQ27500_REG_DCAP                0x3C /* Design capacity */
 69 #define BQ27500_FLAG_DSC                BIT(0)
 70 #define BQ27500_FLAG_SOCF               BIT(1) /* State-of-Charge threshold final */
 71 #define BQ27500_FLAG_SOC1               BIT(2) /* State-of-Charge threshold 1 */
 72 #define BQ27500_FLAG_FC                 BIT(9)
 73 #define BQ27500_FLAG_OTC                BIT(15)
 74 
 75 #define BQ27742_POWER_AVG               0x76
 76 
 77 /* bq27425 register addresses are same as bq27x00 addresses minus 4 */
 78 #define BQ27425_REG_OFFSET              0x04
 79 #define BQ27425_REG_SOC         (0x1C + BQ27425_REG_OFFSET)
 80 #define BQ27425_REG_DCAP                (0x3C + BQ27425_REG_OFFSET)
 81 
 82 #define BQ27000_RS                      20 /* Resistor sense */
 83 #define BQ27x00_POWER_CONSTANT          (256 * 29200 / 1000)
 84 
 85 struct bq27x00_device_info;
 86 struct bq27x00_access_methods {
 87         int (*read)(struct bq27x00_device_info *di, u8 reg, bool single);
 88 };
 89 
 90 enum bq27x00_chip { BQ27000, BQ27500, BQ27425, BQ27742};
 91 
 92 struct bq27x00_reg_cache {
 93         int temperature;
 94         int time_to_empty;
 95         int time_to_empty_avg;
 96         int time_to_full;
 97         int charge_full;
 98         int cycle_count;
 99         int capacity;
100         int energy;
101         int flags;
102         int power_avg;
103         int health;
104 };
105 
106 struct bq27x00_device_info {
107         struct device           *dev;
108         int                     id;
109         enum bq27x00_chip       chip;
110 
111         struct bq27x00_reg_cache cache;
112         int charge_design_full;
113 
114         unsigned long last_update;
115         struct delayed_work work;
116 
117         struct power_supply     bat;
118 
119         struct bq27x00_access_methods bus;
120 
121         struct mutex lock;
122 };
123 
124 static enum power_supply_property bq27x00_battery_props[] = {
125         POWER_SUPPLY_PROP_STATUS,
126         POWER_SUPPLY_PROP_PRESENT,
127         POWER_SUPPLY_PROP_VOLTAGE_NOW,
128         POWER_SUPPLY_PROP_CURRENT_NOW,
129         POWER_SUPPLY_PROP_CAPACITY,
130         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
131         POWER_SUPPLY_PROP_TEMP,
132         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
133         POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
134         POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
135         POWER_SUPPLY_PROP_TECHNOLOGY,
136         POWER_SUPPLY_PROP_CHARGE_FULL,
137         POWER_SUPPLY_PROP_CHARGE_NOW,
138         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
139         POWER_SUPPLY_PROP_CYCLE_COUNT,
140         POWER_SUPPLY_PROP_ENERGY_NOW,
141         POWER_SUPPLY_PROP_POWER_AVG,
142         POWER_SUPPLY_PROP_HEALTH,
143 };
144 
145 static enum power_supply_property bq27425_battery_props[] = {
146         POWER_SUPPLY_PROP_STATUS,
147         POWER_SUPPLY_PROP_PRESENT,
148         POWER_SUPPLY_PROP_VOLTAGE_NOW,
149         POWER_SUPPLY_PROP_CURRENT_NOW,
150         POWER_SUPPLY_PROP_CAPACITY,
151         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
152         POWER_SUPPLY_PROP_TEMP,
153         POWER_SUPPLY_PROP_TECHNOLOGY,
154         POWER_SUPPLY_PROP_CHARGE_FULL,
155         POWER_SUPPLY_PROP_CHARGE_NOW,
156         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
157 };
158 
159 static enum power_supply_property bq27742_battery_props[] = {
160         POWER_SUPPLY_PROP_STATUS,
161         POWER_SUPPLY_PROP_PRESENT,
162         POWER_SUPPLY_PROP_VOLTAGE_NOW,
163         POWER_SUPPLY_PROP_CURRENT_NOW,
164         POWER_SUPPLY_PROP_CAPACITY,
165         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
166         POWER_SUPPLY_PROP_TEMP,
167         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
168         POWER_SUPPLY_PROP_TECHNOLOGY,
169         POWER_SUPPLY_PROP_CHARGE_FULL,
170         POWER_SUPPLY_PROP_CHARGE_NOW,
171         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
172         POWER_SUPPLY_PROP_CYCLE_COUNT,
173         POWER_SUPPLY_PROP_POWER_AVG,
174         POWER_SUPPLY_PROP_HEALTH,
175 };
176 
177 static unsigned int poll_interval = 360;
178 module_param(poll_interval, uint, 0644);
179 MODULE_PARM_DESC(poll_interval, "battery poll interval in seconds - " \
180                                 "0 disables polling");
181 
182 /*
183  * Common code for BQ27x00 devices
184  */
185 
186 static inline int bq27x00_read(struct bq27x00_device_info *di, u8 reg,
187                 bool single)
188 {
189         if (di->chip == BQ27425)
190                 return di->bus.read(di, reg - BQ27425_REG_OFFSET, single);
191         return di->bus.read(di, reg, single);
192 }
193 
194 /*
195  * Higher versions of the chip like BQ27425 and BQ27500
196  * differ from BQ27000 and BQ27200 in calculation of certain
197  * parameters. Hence we need to check for the chip type.
198  */
199 static bool bq27xxx_is_chip_version_higher(struct bq27x00_device_info *di)
200 {
201         if (di->chip == BQ27425 || di->chip == BQ27500 || di->chip == BQ27742)
202                 return true;
203         return false;
204 }
205 
206 /*
207  * Return the battery Relative State-of-Charge
208  * Or < 0 if something fails.
209  */
210 static int bq27x00_battery_read_rsoc(struct bq27x00_device_info *di)
211 {
212         int rsoc;
213 
214         if (di->chip == BQ27500 || di->chip == BQ27742)
215                 rsoc = bq27x00_read(di, BQ27500_REG_SOC, false);
216         else if (di->chip == BQ27425)
217                 rsoc = bq27x00_read(di, BQ27425_REG_SOC, false);
218         else
219                 rsoc = bq27x00_read(di, BQ27000_REG_RSOC, true);
220 
221         if (rsoc < 0)
222                 dev_dbg(di->dev, "error reading relative State-of-Charge\n");
223 
224         return rsoc;
225 }
226 
227 /*
228  * Return a battery charge value in µAh
229  * Or < 0 if something fails.
230  */
231 static int bq27x00_battery_read_charge(struct bq27x00_device_info *di, u8 reg)
232 {
233         int charge;
234 
235         charge = bq27x00_read(di, reg, false);
236         if (charge < 0) {
237                 dev_dbg(di->dev, "error reading charge register %02x: %d\n",
238                         reg, charge);
239                 return charge;
240         }
241 
242         if (bq27xxx_is_chip_version_higher(di))
243                 charge *= 1000;
244         else
245                 charge = charge * 3570 / BQ27000_RS;
246 
247         return charge;
248 }
249 
250 /*
251  * Return the battery Nominal available capaciy in µAh
252  * Or < 0 if something fails.
253  */
254 static inline int bq27x00_battery_read_nac(struct bq27x00_device_info *di)
255 {
256         int flags;
257         bool is_bq27500 = di->chip == BQ27500;
258         bool is_bq27742 = di->chip == BQ27742;
259         bool is_higher = bq27xxx_is_chip_version_higher(di);
260         bool flags_1b = !(is_bq27500 || is_bq27742);
261 
262         flags = bq27x00_read(di, BQ27x00_REG_FLAGS, flags_1b);
263         if (flags >= 0 && !is_higher && (flags & BQ27000_FLAG_CI))
264                 return -ENODATA;
265 
266         return bq27x00_battery_read_charge(di, BQ27x00_REG_NAC);
267 }
268 
269 /*
270  * Return the battery Last measured discharge in µAh
271  * Or < 0 if something fails.
272  */
273 static inline int bq27x00_battery_read_lmd(struct bq27x00_device_info *di)
274 {
275         return bq27x00_battery_read_charge(di, BQ27x00_REG_LMD);
276 }
277 
278 /*
279  * Return the battery Initial last measured discharge in µAh
280  * Or < 0 if something fails.
281  */
282 static int bq27x00_battery_read_ilmd(struct bq27x00_device_info *di)
283 {
284         int ilmd;
285 
286         if (bq27xxx_is_chip_version_higher(di)) {
287                 if (di->chip == BQ27425)
288                         ilmd = bq27x00_read(di, BQ27425_REG_DCAP, false);
289                 else
290                         ilmd = bq27x00_read(di, BQ27500_REG_DCAP, false);
291         } else
292                 ilmd = bq27x00_read(di, BQ27000_REG_ILMD, true);
293 
294         if (ilmd < 0) {
295                 dev_dbg(di->dev, "error reading initial last measured discharge\n");
296                 return ilmd;
297         }
298 
299         if (bq27xxx_is_chip_version_higher(di))
300                 ilmd *= 1000;
301         else
302                 ilmd = ilmd * 256 * 3570 / BQ27000_RS;
303 
304         return ilmd;
305 }
306 
307 /*
308  * Return the battery Available energy in µWh
309  * Or < 0 if something fails.
310  */
311 static int bq27x00_battery_read_energy(struct bq27x00_device_info *di)
312 {
313         int ae;
314 
315         ae = bq27x00_read(di, BQ27x00_REG_AE, false);
316         if (ae < 0) {
317                 dev_dbg(di->dev, "error reading available energy\n");
318                 return ae;
319         }
320 
321         if (di->chip == BQ27500)
322                 ae *= 1000;
323         else
324                 ae = ae * 29200 / BQ27000_RS;
325 
326         return ae;
327 }
328 
329 /*
330  * Return the battery temperature in tenths of degree Kelvin
331  * Or < 0 if something fails.
332  */
333 static int bq27x00_battery_read_temperature(struct bq27x00_device_info *di)
334 {
335         int temp;
336 
337         temp = bq27x00_read(di, BQ27x00_REG_TEMP, false);
338         if (temp < 0) {
339                 dev_err(di->dev, "error reading temperature\n");
340                 return temp;
341         }
342 
343         if (!bq27xxx_is_chip_version_higher(di))
344                 temp = 5 * temp / 2;
345 
346         return temp;
347 }
348 
349 /*
350  * Return the battery Cycle count total
351  * Or < 0 if something fails.
352  */
353 static int bq27x00_battery_read_cyct(struct bq27x00_device_info *di)
354 {
355         int cyct;
356 
357         cyct = bq27x00_read(di, BQ27x00_REG_CYCT, false);
358         if (cyct < 0)
359                 dev_err(di->dev, "error reading cycle count total\n");
360 
361         return cyct;
362 }
363 
364 /*
365  * Read a time register.
366  * Return < 0 if something fails.
367  */
368 static int bq27x00_battery_read_time(struct bq27x00_device_info *di, u8 reg)
369 {
370         int tval;
371 
372         tval = bq27x00_read(di, reg, false);
373         if (tval < 0) {
374                 dev_dbg(di->dev, "error reading time register %02x: %d\n",
375                         reg, tval);
376                 return tval;
377         }
378 
379         if (tval == 65535)
380                 return -ENODATA;
381 
382         return tval * 60;
383 }
384 
385 /*
386  * Read a power avg register.
387  * Return < 0 if something fails.
388  */
389 static int bq27x00_battery_read_pwr_avg(struct bq27x00_device_info *di, u8 reg)
390 {
391         int tval;
392 
393         tval = bq27x00_read(di, reg, false);
394         if (tval < 0) {
395                 dev_err(di->dev, "error reading power avg rgister  %02x: %d\n",
396                         reg, tval);
397                 return tval;
398         }
399 
400         if (di->chip == BQ27500)
401                 return tval;
402         else
403                 return (tval * BQ27x00_POWER_CONSTANT) / BQ27000_RS;
404 }
405 
406 /*
407  * Read flag register.
408  * Return < 0 if something fails.
409  */
410 static int bq27x00_battery_read_health(struct bq27x00_device_info *di)
411 {
412         int tval;
413 
414         tval = bq27x00_read(di, BQ27x00_REG_FLAGS, false);
415         if (tval < 0) {
416                 dev_err(di->dev, "error reading flag register:%d\n", tval);
417                 return tval;
418         }
419 
420         if ((di->chip == BQ27500)) {
421                 if (tval & BQ27500_FLAG_SOCF)
422                         tval = POWER_SUPPLY_HEALTH_DEAD;
423                 else if (tval & BQ27500_FLAG_OTC)
424                         tval = POWER_SUPPLY_HEALTH_OVERHEAT;
425                 else
426                         tval = POWER_SUPPLY_HEALTH_GOOD;
427                 return tval;
428         } else {
429                 if (tval & BQ27000_FLAG_EDV1)
430                         tval = POWER_SUPPLY_HEALTH_DEAD;
431                 else
432                         tval = POWER_SUPPLY_HEALTH_GOOD;
433                 return tval;
434         }
435 
436         return -1;
437 }
438 
439 static void bq27x00_update(struct bq27x00_device_info *di)
440 {
441         struct bq27x00_reg_cache cache = {0, };
442         bool is_bq27500 = di->chip == BQ27500;
443         bool is_bq27425 = di->chip == BQ27425;
444         bool is_bq27742 = di->chip == BQ27742;
445         bool flags_1b = !(is_bq27500 || is_bq27742);
446 
447         cache.flags = bq27x00_read(di, BQ27x00_REG_FLAGS, flags_1b);
448         if ((cache.flags & 0xff) == 0xff)
449                 /* read error */
450                 cache.flags = -1;
451         if (cache.flags >= 0) {
452                 if (!is_bq27500 && !is_bq27425 && !is_bq27742
453                                 && (cache.flags & BQ27000_FLAG_CI)) {
454                         dev_info(di->dev, "battery is not calibrated! ignoring capacity values\n");
455                         cache.capacity = -ENODATA;
456                         cache.energy = -ENODATA;
457                         cache.time_to_empty = -ENODATA;
458                         cache.time_to_empty_avg = -ENODATA;
459                         cache.time_to_full = -ENODATA;
460                         cache.charge_full = -ENODATA;
461                         cache.health = -ENODATA;
462                 } else {
463                         cache.capacity = bq27x00_battery_read_rsoc(di);
464                         if (is_bq27742)
465                                 cache.time_to_empty =
466                                         bq27x00_battery_read_time(di,
467                                                         BQ27x00_REG_TTE);
468                         else if (!is_bq27425) {
469                                 cache.energy = bq27x00_battery_read_energy(di);
470                                 cache.time_to_empty =
471                                         bq27x00_battery_read_time(di,
472                                                         BQ27x00_REG_TTE);
473                                 cache.time_to_empty_avg =
474                                         bq27x00_battery_read_time(di,
475                                                         BQ27x00_REG_TTECP);
476                                 cache.time_to_full =
477                                         bq27x00_battery_read_time(di,
478                                                         BQ27x00_REG_TTF);
479                         }
480                         cache.charge_full = bq27x00_battery_read_lmd(di);
481                         cache.health = bq27x00_battery_read_health(di);
482                 }
483                 cache.temperature = bq27x00_battery_read_temperature(di);
484                 if (!is_bq27425)
485                         cache.cycle_count = bq27x00_battery_read_cyct(di);
486                 if (is_bq27742)
487                         cache.power_avg =
488                                 bq27x00_battery_read_pwr_avg(di,
489                                                 BQ27742_POWER_AVG);
490                 else
491                         cache.power_avg =
492                                 bq27x00_battery_read_pwr_avg(di,
493                                                 BQ27x00_POWER_AVG);
494 
495                 /* We only have to read charge design full once */
496                 if (di->charge_design_full <= 0)
497                         di->charge_design_full = bq27x00_battery_read_ilmd(di);
498         }
499 
500         if (di->cache.capacity != cache.capacity)
501                 power_supply_changed(&di->bat);
502 
503         if (memcmp(&di->cache, &cache, sizeof(cache)) != 0)
504                 di->cache = cache;
505 
506         di->last_update = jiffies;
507 }
508 
509 static void bq27x00_battery_poll(struct work_struct *work)
510 {
511         struct bq27x00_device_info *di =
512                 container_of(work, struct bq27x00_device_info, work.work);
513 
514         bq27x00_update(di);
515 
516         if (poll_interval > 0) {
517                 /* The timer does not have to be accurate. */
518                 set_timer_slack(&di->work.timer, poll_interval * HZ / 4);
519                 schedule_delayed_work(&di->work, poll_interval * HZ);
520         }
521 }
522 
523 /*
524  * Return the battery average current in µA
525  * Note that current can be negative signed as well
526  * Or 0 if something fails.
527  */
528 static int bq27x00_battery_current(struct bq27x00_device_info *di,
529         union power_supply_propval *val)
530 {
531         int curr;
532         int flags;
533 
534         curr = bq27x00_read(di, BQ27x00_REG_AI, false);
535         if (curr < 0) {
536                 dev_err(di->dev, "error reading current\n");
537                 return curr;
538         }
539 
540         if (bq27xxx_is_chip_version_higher(di)) {
541                 /* bq27500 returns signed value */
542                 val->intval = (int)((s16)curr) * 1000;
543         } else {
544                 flags = bq27x00_read(di, BQ27x00_REG_FLAGS, false);
545                 if (flags & BQ27000_FLAG_CHGS) {
546                         dev_dbg(di->dev, "negative current!\n");
547                         curr = -curr;
548                 }
549 
550                 val->intval = curr * 3570 / BQ27000_RS;
551         }
552 
553         return 0;
554 }
555 
556 static int bq27x00_battery_status(struct bq27x00_device_info *di,
557         union power_supply_propval *val)
558 {
559         int status;
560 
561         if (bq27xxx_is_chip_version_higher(di)) {
562                 if (di->cache.flags & BQ27500_FLAG_FC)
563                         status = POWER_SUPPLY_STATUS_FULL;
564                 else if (di->cache.flags & BQ27500_FLAG_DSC)
565                         status = POWER_SUPPLY_STATUS_DISCHARGING;
566                 else
567                         status = POWER_SUPPLY_STATUS_CHARGING;
568         } else {
569                 if (di->cache.flags & BQ27000_FLAG_FC)
570                         status = POWER_SUPPLY_STATUS_FULL;
571                 else if (di->cache.flags & BQ27000_FLAG_CHGS)
572                         status = POWER_SUPPLY_STATUS_CHARGING;
573                 else if (power_supply_am_i_supplied(&di->bat))
574                         status = POWER_SUPPLY_STATUS_NOT_CHARGING;
575                 else
576                         status = POWER_SUPPLY_STATUS_DISCHARGING;
577         }
578 
579         val->intval = status;
580 
581         return 0;
582 }
583 
584 static int bq27x00_battery_capacity_level(struct bq27x00_device_info *di,
585         union power_supply_propval *val)
586 {
587         int level;
588 
589         if (bq27xxx_is_chip_version_higher(di)) {
590                 if (di->cache.flags & BQ27500_FLAG_FC)
591                         level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
592                 else if (di->cache.flags & BQ27500_FLAG_SOC1)
593                         level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
594                 else if (di->cache.flags & BQ27500_FLAG_SOCF)
595                         level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
596                 else
597                         level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
598         } else {
599                 if (di->cache.flags & BQ27000_FLAG_FC)
600                         level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
601                 else if (di->cache.flags & BQ27000_FLAG_EDV1)
602                         level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
603                 else if (di->cache.flags & BQ27000_FLAG_EDVF)
604                         level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
605                 else
606                         level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
607         }
608 
609         val->intval = level;
610 
611         return 0;
612 }
613 
614 /*
615  * Return the battery Voltage in millivolts
616  * Or < 0 if something fails.
617  */
618 static int bq27x00_battery_voltage(struct bq27x00_device_info *di,
619         union power_supply_propval *val)
620 {
621         int volt;
622 
623         volt = bq27x00_read(di, BQ27x00_REG_VOLT, false);
624         if (volt < 0) {
625                 dev_err(di->dev, "error reading voltage\n");
626                 return volt;
627         }
628 
629         val->intval = volt * 1000;
630 
631         return 0;
632 }
633 
634 static int bq27x00_simple_value(int value,
635         union power_supply_propval *val)
636 {
637         if (value < 0)
638                 return value;
639 
640         val->intval = value;
641 
642         return 0;
643 }
644 
645 #define to_bq27x00_device_info(x) container_of((x), \
646                                 struct bq27x00_device_info, bat);
647 
648 static int bq27x00_battery_get_property(struct power_supply *psy,
649                                         enum power_supply_property psp,
650                                         union power_supply_propval *val)
651 {
652         int ret = 0;
653         struct bq27x00_device_info *di = to_bq27x00_device_info(psy);
654 
655         mutex_lock(&di->lock);
656         if (time_is_before_jiffies(di->last_update + 5 * HZ)) {
657                 cancel_delayed_work_sync(&di->work);
658                 bq27x00_battery_poll(&di->work.work);
659         }
660         mutex_unlock(&di->lock);
661 
662         if (psp != POWER_SUPPLY_PROP_PRESENT && di->cache.flags < 0)
663                 return -ENODEV;
664 
665         switch (psp) {
666         case POWER_SUPPLY_PROP_STATUS:
667                 ret = bq27x00_battery_status(di, val);
668                 break;
669         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
670                 ret = bq27x00_battery_voltage(di, val);
671                 break;
672         case POWER_SUPPLY_PROP_PRESENT:
673                 val->intval = di->cache.flags < 0 ? 0 : 1;
674                 break;
675         case POWER_SUPPLY_PROP_CURRENT_NOW:
676                 ret = bq27x00_battery_current(di, val);
677                 break;
678         case POWER_SUPPLY_PROP_CAPACITY:
679                 ret = bq27x00_simple_value(di->cache.capacity, val);
680                 break;
681         case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
682                 ret = bq27x00_battery_capacity_level(di, val);
683                 break;
684         case POWER_SUPPLY_PROP_TEMP:
685                 ret = bq27x00_simple_value(di->cache.temperature, val);
686                 if (ret == 0)
687                         val->intval -= 2731;
688                 break;
689         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
690                 ret = bq27x00_simple_value(di->cache.time_to_empty, val);
691                 break;
692         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
693                 ret = bq27x00_simple_value(di->cache.time_to_empty_avg, val);
694                 break;
695         case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
696                 ret = bq27x00_simple_value(di->cache.time_to_full, val);
697                 break;
698         case POWER_SUPPLY_PROP_TECHNOLOGY:
699                 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
700                 break;
701         case POWER_SUPPLY_PROP_CHARGE_NOW:
702                 ret = bq27x00_simple_value(bq27x00_battery_read_nac(di), val);
703                 break;
704         case POWER_SUPPLY_PROP_CHARGE_FULL:
705                 ret = bq27x00_simple_value(di->cache.charge_full, val);
706                 break;
707         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
708                 ret = bq27x00_simple_value(di->charge_design_full, val);
709                 break;
710         case POWER_SUPPLY_PROP_CYCLE_COUNT:
711                 ret = bq27x00_simple_value(di->cache.cycle_count, val);
712                 break;
713         case POWER_SUPPLY_PROP_ENERGY_NOW:
714                 ret = bq27x00_simple_value(di->cache.energy, val);
715                 break;
716         case POWER_SUPPLY_PROP_POWER_AVG:
717                 ret = bq27x00_simple_value(di->cache.power_avg, val);
718                 break;
719         case POWER_SUPPLY_PROP_HEALTH:
720                 ret = bq27x00_simple_value(di->cache.health, val);
721                 break;
722         default:
723                 return -EINVAL;
724         }
725 
726         return ret;
727 }
728 
729 static void bq27x00_external_power_changed(struct power_supply *psy)
730 {
731         struct bq27x00_device_info *di = to_bq27x00_device_info(psy);
732 
733         cancel_delayed_work_sync(&di->work);
734         schedule_delayed_work(&di->work, 0);
735 }
736 
737 static int bq27x00_powersupply_init(struct bq27x00_device_info *di)
738 {
739         int ret;
740 
741         di->bat.type = POWER_SUPPLY_TYPE_BATTERY;
742         if (di->chip == BQ27425) {
743                 di->bat.properties = bq27425_battery_props;
744                 di->bat.num_properties = ARRAY_SIZE(bq27425_battery_props);
745         } else if (di->chip == BQ27742) {
746                 di->bat.properties = bq27742_battery_props;
747                 di->bat.num_properties = ARRAY_SIZE(bq27742_battery_props);
748         } else {
749                 di->bat.properties = bq27x00_battery_props;
750                 di->bat.num_properties = ARRAY_SIZE(bq27x00_battery_props);
751         }
752         di->bat.get_property = bq27x00_battery_get_property;
753         di->bat.external_power_changed = bq27x00_external_power_changed;
754 
755         INIT_DELAYED_WORK(&di->work, bq27x00_battery_poll);
756         mutex_init(&di->lock);
757 
758         ret = power_supply_register(di->dev, &di->bat);
759         if (ret) {
760                 dev_err(di->dev, "failed to register battery: %d\n", ret);
761                 return ret;
762         }
763 
764         dev_info(di->dev, "support ver. %s enabled\n", DRIVER_VERSION);
765 
766         bq27x00_update(di);
767 
768         return 0;
769 }
770 
771 static void bq27x00_powersupply_unregister(struct bq27x00_device_info *di)
772 {
773         /*
774          * power_supply_unregister call bq27x00_battery_get_property which
775          * call bq27x00_battery_poll.
776          * Make sure that bq27x00_battery_poll will not call
777          * schedule_delayed_work again after unregister (which cause OOPS).
778          */
779         poll_interval = 0;
780 
781         cancel_delayed_work_sync(&di->work);
782 
783         power_supply_unregister(&di->bat);
784 
785         mutex_destroy(&di->lock);
786 }
787 
788 
789 /* i2c specific code */
790 #ifdef CONFIG_BATTERY_BQ27X00_I2C
791 
792 /* If the system has several batteries we need a different name for each
793  * of them...
794  */
795 static DEFINE_IDR(battery_id);
796 static DEFINE_MUTEX(battery_mutex);
797 
798 static int bq27x00_read_i2c(struct bq27x00_device_info *di, u8 reg, bool single)
799 {
800         struct i2c_client *client = to_i2c_client(di->dev);
801         struct i2c_msg msg[2];
802         unsigned char data[2];
803         int ret;
804 
805         if (!client->adapter)
806                 return -ENODEV;
807 
808         msg[0].addr = client->addr;
809         msg[0].flags = 0;
810         msg[0].buf = &reg;
811         msg[0].len = sizeof(reg);
812         msg[1].addr = client->addr;
813         msg[1].flags = I2C_M_RD;
814         msg[1].buf = data;
815         if (single)
816                 msg[1].len = 1;
817         else
818                 msg[1].len = 2;
819 
820         ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
821         if (ret < 0)
822                 return ret;
823 
824         if (!single)
825                 ret = get_unaligned_le16(data);
826         else
827                 ret = data[0];
828 
829         return ret;
830 }
831 
832 static int bq27x00_battery_probe(struct i2c_client *client,
833                                  const struct i2c_device_id *id)
834 {
835         char *name;
836         struct bq27x00_device_info *di;
837         int num;
838         int retval = 0;
839 
840         /* Get new ID for the new battery device */
841         mutex_lock(&battery_mutex);
842         num = idr_alloc(&battery_id, client, 0, 0, GFP_KERNEL);
843         mutex_unlock(&battery_mutex);
844         if (num < 0)
845                 return num;
846 
847         name = kasprintf(GFP_KERNEL, "%s-%d", id->name, num);
848         if (!name) {
849                 dev_err(&client->dev, "failed to allocate device name\n");
850                 retval = -ENOMEM;
851                 goto batt_failed_1;
852         }
853 
854         di = devm_kzalloc(&client->dev, sizeof(*di), GFP_KERNEL);
855         if (!di) {
856                 dev_err(&client->dev, "failed to allocate device info data\n");
857                 retval = -ENOMEM;
858                 goto batt_failed_2;
859         }
860 
861         di->id = num;
862         di->dev = &client->dev;
863         di->chip = id->driver_data;
864         di->bat.name = name;
865         di->bus.read = &bq27x00_read_i2c;
866 
867         retval = bq27x00_powersupply_init(di);
868         if (retval)
869                 goto batt_failed_2;
870 
871         i2c_set_clientdata(client, di);
872 
873         return 0;
874 
875 batt_failed_2:
876         kfree(name);
877 batt_failed_1:
878         mutex_lock(&battery_mutex);
879         idr_remove(&battery_id, num);
880         mutex_unlock(&battery_mutex);
881 
882         return retval;
883 }
884 
885 static int bq27x00_battery_remove(struct i2c_client *client)
886 {
887         struct bq27x00_device_info *di = i2c_get_clientdata(client);
888 
889         bq27x00_powersupply_unregister(di);
890 
891         kfree(di->bat.name);
892 
893         mutex_lock(&battery_mutex);
894         idr_remove(&battery_id, di->id);
895         mutex_unlock(&battery_mutex);
896 
897         return 0;
898 }
899 
900 static const struct i2c_device_id bq27x00_id[] = {
901         { "bq27200", BQ27000 }, /* bq27200 is same as bq27000, but with i2c */
902         { "bq27500", BQ27500 },
903         { "bq27425", BQ27425 },
904         { "bq27742", BQ27742 },
905         {},
906 };
907 MODULE_DEVICE_TABLE(i2c, bq27x00_id);
908 
909 static struct i2c_driver bq27x00_battery_driver = {
910         .driver = {
911                 .name = "bq27x00-battery",
912         },
913         .probe = bq27x00_battery_probe,
914         .remove = bq27x00_battery_remove,
915         .id_table = bq27x00_id,
916 };
917 
918 static inline int bq27x00_battery_i2c_init(void)
919 {
920         int ret = i2c_add_driver(&bq27x00_battery_driver);
921         if (ret)
922                 printk(KERN_ERR "Unable to register BQ27x00 i2c driver\n");
923 
924         return ret;
925 }
926 
927 static inline void bq27x00_battery_i2c_exit(void)
928 {
929         i2c_del_driver(&bq27x00_battery_driver);
930 }
931 
932 #else
933 
934 static inline int bq27x00_battery_i2c_init(void) { return 0; }
935 static inline void bq27x00_battery_i2c_exit(void) {};
936 
937 #endif
938 
939 /* platform specific code */
940 #ifdef CONFIG_BATTERY_BQ27X00_PLATFORM
941 
942 static int bq27000_read_platform(struct bq27x00_device_info *di, u8 reg,
943                         bool single)
944 {
945         struct device *dev = di->dev;
946         struct bq27000_platform_data *pdata = dev->platform_data;
947         unsigned int timeout = 3;
948         int upper, lower;
949         int temp;
950 
951         if (!single) {
952                 /* Make sure the value has not changed in between reading the
953                  * lower and the upper part */
954                 upper = pdata->read(dev, reg + 1);
955                 do {
956                         temp = upper;
957                         if (upper < 0)
958                                 return upper;
959 
960                         lower = pdata->read(dev, reg);
961                         if (lower < 0)
962                                 return lower;
963 
964                         upper = pdata->read(dev, reg + 1);
965                 } while (temp != upper && --timeout);
966 
967                 if (timeout == 0)
968                         return -EIO;
969 
970                 return (upper << 8) | lower;
971         }
972 
973         return pdata->read(dev, reg);
974 }
975 
976 static int bq27000_battery_probe(struct platform_device *pdev)
977 {
978         struct bq27x00_device_info *di;
979         struct bq27000_platform_data *pdata = pdev->dev.platform_data;
980 
981         if (!pdata) {
982                 dev_err(&pdev->dev, "no platform_data supplied\n");
983                 return -EINVAL;
984         }
985 
986         if (!pdata->read) {
987                 dev_err(&pdev->dev, "no hdq read callback supplied\n");
988                 return -EINVAL;
989         }
990 
991         di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
992         if (!di) {
993                 dev_err(&pdev->dev, "failed to allocate device info data\n");
994                 return -ENOMEM;
995         }
996 
997         platform_set_drvdata(pdev, di);
998 
999         di->dev = &pdev->dev;
1000         di->chip = BQ27000;
1001 
1002         di->bat.name = pdata->name ?: dev_name(&pdev->dev);
1003         di->bus.read = &bq27000_read_platform;
1004 
1005         return bq27x00_powersupply_init(di);
1006 }
1007 
1008 static int bq27000_battery_remove(struct platform_device *pdev)
1009 {
1010         struct bq27x00_device_info *di = platform_get_drvdata(pdev);
1011 
1012         bq27x00_powersupply_unregister(di);
1013 
1014         return 0;
1015 }
1016 
1017 static struct platform_driver bq27000_battery_driver = {
1018         .probe  = bq27000_battery_probe,
1019         .remove = bq27000_battery_remove,
1020         .driver = {
1021                 .name = "bq27000-battery",
1022         },
1023 };
1024 
1025 static inline int bq27x00_battery_platform_init(void)
1026 {
1027         int ret = platform_driver_register(&bq27000_battery_driver);
1028         if (ret)
1029                 printk(KERN_ERR "Unable to register BQ27000 platform driver\n");
1030 
1031         return ret;
1032 }
1033 
1034 static inline void bq27x00_battery_platform_exit(void)
1035 {
1036         platform_driver_unregister(&bq27000_battery_driver);
1037 }
1038 
1039 #else
1040 
1041 static inline int bq27x00_battery_platform_init(void) { return 0; }
1042 static inline void bq27x00_battery_platform_exit(void) {};
1043 
1044 #endif
1045 
1046 /*
1047  * Module stuff
1048  */
1049 
1050 static int __init bq27x00_battery_init(void)
1051 {
1052         int ret;
1053 
1054         ret = bq27x00_battery_i2c_init();
1055         if (ret)
1056                 return ret;
1057 
1058         ret = bq27x00_battery_platform_init();
1059         if (ret)
1060                 bq27x00_battery_i2c_exit();
1061 
1062         return ret;
1063 }
1064 module_init(bq27x00_battery_init);
1065 
1066 static void __exit bq27x00_battery_exit(void)
1067 {
1068         bq27x00_battery_platform_exit();
1069         bq27x00_battery_i2c_exit();
1070 }
1071 module_exit(bq27x00_battery_exit);
1072 
1073 MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
1074 MODULE_DESCRIPTION("BQ27x00 battery monitor driver");
1075 MODULE_LICENSE("GPL");
1076 

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