Version:  2.0.40 2.2.26 2.4.37 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 4.1

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  * Datasheets:
 20  * http://focus.ti.com/docs/prod/folders/print/bq27000.html
 21  * http://focus.ti.com/docs/prod/folders/print/bq27500.html
 22  * http://www.ti.com/product/bq27425-g1
 23  * http://www.ti.com/product/BQ27742-G1
 24  * http://www.ti.com/product/BQ27510-G3
 25  */
 26 
 27 #include <linux/device.h>
 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 #define BQ27742_POWER_AVG               0x76
 74 
 75 #define BQ27510_REG_SOC                 0x20
 76 #define BQ27510_REG_DCAP                0x2E /* Design capacity */
 77 #define BQ27510_REG_CYCT                0x1E /* Cycle count total */
 78 
 79 /* bq27425 register addresses are same as bq27x00 addresses minus 4 */
 80 #define BQ27425_REG_OFFSET              0x04
 81 #define BQ27425_REG_SOC         (0x1C + BQ27425_REG_OFFSET)
 82 #define BQ27425_REG_DCAP                (0x3C + BQ27425_REG_OFFSET)
 83 
 84 #define BQ27000_RS                      20 /* Resistor sense */
 85 #define BQ27x00_POWER_CONSTANT          (256 * 29200 / 1000)
 86 
 87 struct bq27x00_device_info;
 88 struct bq27x00_access_methods {
 89         int (*read)(struct bq27x00_device_info *di, u8 reg, bool single);
 90 };
 91 
 92 enum bq27x00_chip { BQ27000, BQ27500, BQ27425, BQ27742, BQ27510};
 93 
 94 struct bq27x00_reg_cache {
 95         int temperature;
 96         int time_to_empty;
 97         int time_to_empty_avg;
 98         int time_to_full;
 99         int charge_full;
100         int cycle_count;
101         int capacity;
102         int energy;
103         int flags;
104         int power_avg;
105         int health;
106 };
107 
108 struct bq27x00_device_info {
109         struct device           *dev;
110         int                     id;
111         enum bq27x00_chip       chip;
112 
113         struct bq27x00_reg_cache cache;
114         int charge_design_full;
115 
116         unsigned long last_update;
117         struct delayed_work work;
118 
119         struct power_supply     *bat;
120 
121         struct bq27x00_access_methods bus;
122 
123         struct mutex lock;
124 };
125 
126 static enum power_supply_property bq27x00_battery_props[] = {
127         POWER_SUPPLY_PROP_STATUS,
128         POWER_SUPPLY_PROP_PRESENT,
129         POWER_SUPPLY_PROP_VOLTAGE_NOW,
130         POWER_SUPPLY_PROP_CURRENT_NOW,
131         POWER_SUPPLY_PROP_CAPACITY,
132         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
133         POWER_SUPPLY_PROP_TEMP,
134         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
135         POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
136         POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
137         POWER_SUPPLY_PROP_TECHNOLOGY,
138         POWER_SUPPLY_PROP_CHARGE_FULL,
139         POWER_SUPPLY_PROP_CHARGE_NOW,
140         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
141         POWER_SUPPLY_PROP_CYCLE_COUNT,
142         POWER_SUPPLY_PROP_ENERGY_NOW,
143         POWER_SUPPLY_PROP_POWER_AVG,
144         POWER_SUPPLY_PROP_HEALTH,
145 };
146 
147 static enum power_supply_property bq27425_battery_props[] = {
148         POWER_SUPPLY_PROP_STATUS,
149         POWER_SUPPLY_PROP_PRESENT,
150         POWER_SUPPLY_PROP_VOLTAGE_NOW,
151         POWER_SUPPLY_PROP_CURRENT_NOW,
152         POWER_SUPPLY_PROP_CAPACITY,
153         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
154         POWER_SUPPLY_PROP_TEMP,
155         POWER_SUPPLY_PROP_TECHNOLOGY,
156         POWER_SUPPLY_PROP_CHARGE_FULL,
157         POWER_SUPPLY_PROP_CHARGE_NOW,
158         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
159 };
160 
161 static enum power_supply_property bq27742_battery_props[] = {
162         POWER_SUPPLY_PROP_STATUS,
163         POWER_SUPPLY_PROP_PRESENT,
164         POWER_SUPPLY_PROP_VOLTAGE_NOW,
165         POWER_SUPPLY_PROP_CURRENT_NOW,
166         POWER_SUPPLY_PROP_CAPACITY,
167         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
168         POWER_SUPPLY_PROP_TEMP,
169         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
170         POWER_SUPPLY_PROP_TECHNOLOGY,
171         POWER_SUPPLY_PROP_CHARGE_FULL,
172         POWER_SUPPLY_PROP_CHARGE_NOW,
173         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
174         POWER_SUPPLY_PROP_CYCLE_COUNT,
175         POWER_SUPPLY_PROP_POWER_AVG,
176         POWER_SUPPLY_PROP_HEALTH,
177 };
178 
179 static enum power_supply_property bq27510_battery_props[] = {
180         POWER_SUPPLY_PROP_STATUS,
181         POWER_SUPPLY_PROP_PRESENT,
182         POWER_SUPPLY_PROP_VOLTAGE_NOW,
183         POWER_SUPPLY_PROP_CURRENT_NOW,
184         POWER_SUPPLY_PROP_CAPACITY,
185         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
186         POWER_SUPPLY_PROP_TEMP,
187         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
188         POWER_SUPPLY_PROP_TECHNOLOGY,
189         POWER_SUPPLY_PROP_CHARGE_FULL,
190         POWER_SUPPLY_PROP_CHARGE_NOW,
191         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
192         POWER_SUPPLY_PROP_CYCLE_COUNT,
193         POWER_SUPPLY_PROP_POWER_AVG,
194         POWER_SUPPLY_PROP_HEALTH,
195 };
196 
197 static unsigned int poll_interval = 360;
198 module_param(poll_interval, uint, 0644);
199 MODULE_PARM_DESC(poll_interval, "battery poll interval in seconds - " \
200                                 "0 disables polling");
201 
202 /*
203  * Common code for BQ27x00 devices
204  */
205 
206 static inline int bq27x00_read(struct bq27x00_device_info *di, u8 reg,
207                 bool single)
208 {
209         if (di->chip == BQ27425)
210                 return di->bus.read(di, reg - BQ27425_REG_OFFSET, single);
211         return di->bus.read(di, reg, single);
212 }
213 
214 /*
215  * Higher versions of the chip like BQ27425 and BQ27500
216  * differ from BQ27000 and BQ27200 in calculation of certain
217  * parameters. Hence we need to check for the chip type.
218  */
219 static bool bq27xxx_is_chip_version_higher(struct bq27x00_device_info *di)
220 {
221         if (di->chip == BQ27425 || di->chip == BQ27500 || di->chip == BQ27742
222             || di->chip == BQ27510)
223                 return true;
224         return false;
225 }
226 
227 /*
228  * Return the battery Relative State-of-Charge
229  * Or < 0 if something fails.
230  */
231 static int bq27x00_battery_read_rsoc(struct bq27x00_device_info *di)
232 {
233         int rsoc;
234 
235         if (di->chip == BQ27500 || di->chip == BQ27742)
236                 rsoc = bq27x00_read(di, BQ27500_REG_SOC, false);
237         else if (di->chip == BQ27510)
238                 rsoc = bq27x00_read(di, BQ27510_REG_SOC, false);
239         else if (di->chip == BQ27425)
240                 rsoc = bq27x00_read(di, BQ27425_REG_SOC, false);
241         else
242                 rsoc = bq27x00_read(di, BQ27000_REG_RSOC, true);
243 
244         if (rsoc < 0)
245                 dev_dbg(di->dev, "error reading relative State-of-Charge\n");
246 
247         return rsoc;
248 }
249 
250 /*
251  * Return a battery charge value in µAh
252  * Or < 0 if something fails.
253  */
254 static int bq27x00_battery_read_charge(struct bq27x00_device_info *di, u8 reg)
255 {
256         int charge;
257 
258         charge = bq27x00_read(di, reg, false);
259         if (charge < 0) {
260                 dev_dbg(di->dev, "error reading charge register %02x: %d\n",
261                         reg, charge);
262                 return charge;
263         }
264 
265         if (bq27xxx_is_chip_version_higher(di))
266                 charge *= 1000;
267         else
268                 charge = charge * 3570 / BQ27000_RS;
269 
270         return charge;
271 }
272 
273 /*
274  * Return the battery Nominal available capaciy in µAh
275  * Or < 0 if something fails.
276  */
277 static inline int bq27x00_battery_read_nac(struct bq27x00_device_info *di)
278 {
279         int flags;
280         bool is_bq27500 = di->chip == BQ27500;
281         bool is_bq27742 = di->chip == BQ27742;
282         bool is_higher = bq27xxx_is_chip_version_higher(di);
283         bool flags_1b = !(is_bq27500 || is_bq27742);
284 
285         flags = bq27x00_read(di, BQ27x00_REG_FLAGS, flags_1b);
286         if (flags >= 0 && !is_higher && (flags & BQ27000_FLAG_CI))
287                 return -ENODATA;
288 
289         return bq27x00_battery_read_charge(di, BQ27x00_REG_NAC);
290 }
291 
292 /*
293  * Return the battery Last measured discharge in µAh
294  * Or < 0 if something fails.
295  */
296 static inline int bq27x00_battery_read_lmd(struct bq27x00_device_info *di)
297 {
298         return bq27x00_battery_read_charge(di, BQ27x00_REG_LMD);
299 }
300 
301 /*
302  * Return the battery Initial last measured discharge in µAh
303  * Or < 0 if something fails.
304  */
305 static int bq27x00_battery_read_ilmd(struct bq27x00_device_info *di)
306 {
307         int ilmd;
308 
309         if (bq27xxx_is_chip_version_higher(di)) {
310                 if (di->chip == BQ27425)
311                         ilmd = bq27x00_read(di, BQ27425_REG_DCAP, false);
312                 else if (di->chip == BQ27510)
313                         ilmd = bq27x00_read(di, BQ27510_REG_DCAP, false);
314                 else
315                         ilmd = bq27x00_read(di, BQ27500_REG_DCAP, false);
316         } else
317                 ilmd = bq27x00_read(di, BQ27000_REG_ILMD, true);
318 
319         if (ilmd < 0) {
320                 dev_dbg(di->dev, "error reading initial last measured discharge\n");
321                 return ilmd;
322         }
323 
324         if (bq27xxx_is_chip_version_higher(di))
325                 ilmd *= 1000;
326         else
327                 ilmd = ilmd * 256 * 3570 / BQ27000_RS;
328 
329         return ilmd;
330 }
331 
332 /*
333  * Return the battery Available energy in µWh
334  * Or < 0 if something fails.
335  */
336 static int bq27x00_battery_read_energy(struct bq27x00_device_info *di)
337 {
338         int ae;
339 
340         ae = bq27x00_read(di, BQ27x00_REG_AE, false);
341         if (ae < 0) {
342                 dev_dbg(di->dev, "error reading available energy\n");
343                 return ae;
344         }
345 
346         if (di->chip == BQ27500)
347                 ae *= 1000;
348         else
349                 ae = ae * 29200 / BQ27000_RS;
350 
351         return ae;
352 }
353 
354 /*
355  * Return the battery temperature in tenths of degree Kelvin
356  * Or < 0 if something fails.
357  */
358 static int bq27x00_battery_read_temperature(struct bq27x00_device_info *di)
359 {
360         int temp;
361 
362         temp = bq27x00_read(di, BQ27x00_REG_TEMP, false);
363         if (temp < 0) {
364                 dev_err(di->dev, "error reading temperature\n");
365                 return temp;
366         }
367 
368         if (!bq27xxx_is_chip_version_higher(di))
369                 temp = 5 * temp / 2;
370 
371         return temp;
372 }
373 
374 /*
375  * Return the battery Cycle count total
376  * Or < 0 if something fails.
377  */
378 static int bq27x00_battery_read_cyct(struct bq27x00_device_info *di)
379 {
380         int cyct;
381 
382         if (di->chip == BQ27510)
383                 cyct = bq27x00_read(di, BQ27510_REG_CYCT, false);
384         else
385                 cyct = bq27x00_read(di, BQ27x00_REG_CYCT, false);
386         if (cyct < 0)
387                 dev_err(di->dev, "error reading cycle count total\n");
388 
389         return cyct;
390 }
391 
392 /*
393  * Read a time register.
394  * Return < 0 if something fails.
395  */
396 static int bq27x00_battery_read_time(struct bq27x00_device_info *di, u8 reg)
397 {
398         int tval;
399 
400         tval = bq27x00_read(di, reg, false);
401         if (tval < 0) {
402                 dev_dbg(di->dev, "error reading time register %02x: %d\n",
403                         reg, tval);
404                 return tval;
405         }
406 
407         if (tval == 65535)
408                 return -ENODATA;
409 
410         return tval * 60;
411 }
412 
413 /*
414  * Read a power avg register.
415  * Return < 0 if something fails.
416  */
417 static int bq27x00_battery_read_pwr_avg(struct bq27x00_device_info *di, u8 reg)
418 {
419         int tval;
420 
421         tval = bq27x00_read(di, reg, false);
422         if (tval < 0) {
423                 dev_err(di->dev, "error reading power avg rgister  %02x: %d\n",
424                         reg, tval);
425                 return tval;
426         }
427 
428         if (di->chip == BQ27500)
429                 return tval;
430         else
431                 return (tval * BQ27x00_POWER_CONSTANT) / BQ27000_RS;
432 }
433 
434 /*
435  * Read flag register.
436  * Return < 0 if something fails.
437  */
438 static int bq27x00_battery_read_health(struct bq27x00_device_info *di)
439 {
440         int tval;
441 
442         tval = bq27x00_read(di, BQ27x00_REG_FLAGS, false);
443         if (tval < 0) {
444                 dev_err(di->dev, "error reading flag register:%d\n", tval);
445                 return tval;
446         }
447 
448         if ((di->chip == BQ27500)) {
449                 if (tval & BQ27500_FLAG_SOCF)
450                         tval = POWER_SUPPLY_HEALTH_DEAD;
451                 else if (tval & BQ27500_FLAG_OTC)
452                         tval = POWER_SUPPLY_HEALTH_OVERHEAT;
453                 else
454                         tval = POWER_SUPPLY_HEALTH_GOOD;
455                 return tval;
456         } else if (di->chip == BQ27510) {
457                 if (tval & BQ27500_FLAG_OTC)
458                         return POWER_SUPPLY_HEALTH_OVERHEAT;
459                 return POWER_SUPPLY_HEALTH_GOOD;
460         } else {
461                 if (tval & BQ27000_FLAG_EDV1)
462                         tval = POWER_SUPPLY_HEALTH_DEAD;
463                 else
464                         tval = POWER_SUPPLY_HEALTH_GOOD;
465                 return tval;
466         }
467 
468         return -1;
469 }
470 
471 static void bq27x00_update(struct bq27x00_device_info *di)
472 {
473         struct bq27x00_reg_cache cache = {0, };
474         bool is_bq27500 = di->chip == BQ27500;
475         bool is_bq27510 = di->chip == BQ27510;
476         bool is_bq27425 = di->chip == BQ27425;
477         bool is_bq27742 = di->chip == BQ27742;
478         bool flags_1b = !(is_bq27500 || is_bq27742);
479 
480         cache.flags = bq27x00_read(di, BQ27x00_REG_FLAGS, flags_1b);
481         if ((cache.flags & 0xff) == 0xff)
482                 /* read error */
483                 cache.flags = -1;
484         if (cache.flags >= 0) {
485                 if (!is_bq27500 && !is_bq27425 && !is_bq27742 && !is_bq27510
486                                 && (cache.flags & BQ27000_FLAG_CI)) {
487                         dev_info(di->dev, "battery is not calibrated! ignoring capacity values\n");
488                         cache.capacity = -ENODATA;
489                         cache.energy = -ENODATA;
490                         cache.time_to_empty = -ENODATA;
491                         cache.time_to_empty_avg = -ENODATA;
492                         cache.time_to_full = -ENODATA;
493                         cache.charge_full = -ENODATA;
494                         cache.health = -ENODATA;
495                 } else {
496                         cache.capacity = bq27x00_battery_read_rsoc(di);
497                         if (is_bq27742 || is_bq27510)
498                                 cache.time_to_empty =
499                                         bq27x00_battery_read_time(di,
500                                                         BQ27x00_REG_TTE);
501                         else if (!is_bq27425) {
502                                 cache.energy = bq27x00_battery_read_energy(di);
503                                 cache.time_to_empty =
504                                         bq27x00_battery_read_time(di,
505                                                         BQ27x00_REG_TTE);
506                                 cache.time_to_empty_avg =
507                                         bq27x00_battery_read_time(di,
508                                                         BQ27x00_REG_TTECP);
509                                 cache.time_to_full =
510                                         bq27x00_battery_read_time(di,
511                                                         BQ27x00_REG_TTF);
512                         }
513                         cache.charge_full = bq27x00_battery_read_lmd(di);
514                         cache.health = bq27x00_battery_read_health(di);
515                 }
516                 cache.temperature = bq27x00_battery_read_temperature(di);
517                 if (!is_bq27425)
518                         cache.cycle_count = bq27x00_battery_read_cyct(di);
519                 if (is_bq27742)
520                         cache.power_avg =
521                                 bq27x00_battery_read_pwr_avg(di,
522                                                 BQ27742_POWER_AVG);
523                 else
524                         cache.power_avg =
525                                 bq27x00_battery_read_pwr_avg(di,
526                                                 BQ27x00_POWER_AVG);
527 
528                 /* We only have to read charge design full once */
529                 if (di->charge_design_full <= 0)
530                         di->charge_design_full = bq27x00_battery_read_ilmd(di);
531         }
532 
533         if (di->cache.capacity != cache.capacity)
534                 power_supply_changed(di->bat);
535 
536         if (memcmp(&di->cache, &cache, sizeof(cache)) != 0)
537                 di->cache = cache;
538 
539         di->last_update = jiffies;
540 }
541 
542 static void bq27x00_battery_poll(struct work_struct *work)
543 {
544         struct bq27x00_device_info *di =
545                 container_of(work, struct bq27x00_device_info, work.work);
546 
547         bq27x00_update(di);
548 
549         if (poll_interval > 0) {
550                 /* The timer does not have to be accurate. */
551                 set_timer_slack(&di->work.timer, poll_interval * HZ / 4);
552                 schedule_delayed_work(&di->work, poll_interval * HZ);
553         }
554 }
555 
556 /*
557  * Return the battery average current in µA
558  * Note that current can be negative signed as well
559  * Or 0 if something fails.
560  */
561 static int bq27x00_battery_current(struct bq27x00_device_info *di,
562         union power_supply_propval *val)
563 {
564         int curr;
565         int flags;
566 
567         curr = bq27x00_read(di, BQ27x00_REG_AI, false);
568         if (curr < 0) {
569                 dev_err(di->dev, "error reading current\n");
570                 return curr;
571         }
572 
573         if (bq27xxx_is_chip_version_higher(di)) {
574                 /* bq27500 returns signed value */
575                 val->intval = (int)((s16)curr) * 1000;
576         } else {
577                 flags = bq27x00_read(di, BQ27x00_REG_FLAGS, false);
578                 if (flags & BQ27000_FLAG_CHGS) {
579                         dev_dbg(di->dev, "negative current!\n");
580                         curr = -curr;
581                 }
582 
583                 val->intval = curr * 3570 / BQ27000_RS;
584         }
585 
586         return 0;
587 }
588 
589 static int bq27x00_battery_status(struct bq27x00_device_info *di,
590         union power_supply_propval *val)
591 {
592         int status;
593 
594         if (bq27xxx_is_chip_version_higher(di)) {
595                 if (di->cache.flags & BQ27500_FLAG_FC)
596                         status = POWER_SUPPLY_STATUS_FULL;
597                 else if (di->cache.flags & BQ27500_FLAG_DSC)
598                         status = POWER_SUPPLY_STATUS_DISCHARGING;
599                 else
600                         status = POWER_SUPPLY_STATUS_CHARGING;
601         } else {
602                 if (di->cache.flags & BQ27000_FLAG_FC)
603                         status = POWER_SUPPLY_STATUS_FULL;
604                 else if (di->cache.flags & BQ27000_FLAG_CHGS)
605                         status = POWER_SUPPLY_STATUS_CHARGING;
606                 else if (power_supply_am_i_supplied(di->bat))
607                         status = POWER_SUPPLY_STATUS_NOT_CHARGING;
608                 else
609                         status = POWER_SUPPLY_STATUS_DISCHARGING;
610         }
611 
612         val->intval = status;
613 
614         return 0;
615 }
616 
617 static int bq27x00_battery_capacity_level(struct bq27x00_device_info *di,
618         union power_supply_propval *val)
619 {
620         int level;
621 
622         if (bq27xxx_is_chip_version_higher(di)) {
623                 if (di->cache.flags & BQ27500_FLAG_FC)
624                         level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
625                 else if (di->cache.flags & BQ27500_FLAG_SOC1)
626                         level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
627                 else if (di->cache.flags & BQ27500_FLAG_SOCF)
628                         level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
629                 else
630                         level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
631         } else {
632                 if (di->cache.flags & BQ27000_FLAG_FC)
633                         level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
634                 else if (di->cache.flags & BQ27000_FLAG_EDV1)
635                         level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
636                 else if (di->cache.flags & BQ27000_FLAG_EDVF)
637                         level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
638                 else
639                         level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
640         }
641 
642         val->intval = level;
643 
644         return 0;
645 }
646 
647 /*
648  * Return the battery Voltage in millivolts
649  * Or < 0 if something fails.
650  */
651 static int bq27x00_battery_voltage(struct bq27x00_device_info *di,
652         union power_supply_propval *val)
653 {
654         int volt;
655 
656         volt = bq27x00_read(di, BQ27x00_REG_VOLT, false);
657         if (volt < 0) {
658                 dev_err(di->dev, "error reading voltage\n");
659                 return volt;
660         }
661 
662         val->intval = volt * 1000;
663 
664         return 0;
665 }
666 
667 static int bq27x00_simple_value(int value,
668         union power_supply_propval *val)
669 {
670         if (value < 0)
671                 return value;
672 
673         val->intval = value;
674 
675         return 0;
676 }
677 
678 static int bq27x00_battery_get_property(struct power_supply *psy,
679                                         enum power_supply_property psp,
680                                         union power_supply_propval *val)
681 {
682         int ret = 0;
683         struct bq27x00_device_info *di = power_supply_get_drvdata(psy);
684 
685         mutex_lock(&di->lock);
686         if (time_is_before_jiffies(di->last_update + 5 * HZ)) {
687                 cancel_delayed_work_sync(&di->work);
688                 bq27x00_battery_poll(&di->work.work);
689         }
690         mutex_unlock(&di->lock);
691 
692         if (psp != POWER_SUPPLY_PROP_PRESENT && di->cache.flags < 0)
693                 return -ENODEV;
694 
695         switch (psp) {
696         case POWER_SUPPLY_PROP_STATUS:
697                 ret = bq27x00_battery_status(di, val);
698                 break;
699         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
700                 ret = bq27x00_battery_voltage(di, val);
701                 break;
702         case POWER_SUPPLY_PROP_PRESENT:
703                 val->intval = di->cache.flags < 0 ? 0 : 1;
704                 break;
705         case POWER_SUPPLY_PROP_CURRENT_NOW:
706                 ret = bq27x00_battery_current(di, val);
707                 break;
708         case POWER_SUPPLY_PROP_CAPACITY:
709                 ret = bq27x00_simple_value(di->cache.capacity, val);
710                 break;
711         case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
712                 ret = bq27x00_battery_capacity_level(di, val);
713                 break;
714         case POWER_SUPPLY_PROP_TEMP:
715                 ret = bq27x00_simple_value(di->cache.temperature, val);
716                 if (ret == 0)
717                         val->intval -= 2731;
718                 break;
719         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
720                 ret = bq27x00_simple_value(di->cache.time_to_empty, val);
721                 break;
722         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
723                 ret = bq27x00_simple_value(di->cache.time_to_empty_avg, val);
724                 break;
725         case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
726                 ret = bq27x00_simple_value(di->cache.time_to_full, val);
727                 break;
728         case POWER_SUPPLY_PROP_TECHNOLOGY:
729                 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
730                 break;
731         case POWER_SUPPLY_PROP_CHARGE_NOW:
732                 ret = bq27x00_simple_value(bq27x00_battery_read_nac(di), val);
733                 break;
734         case POWER_SUPPLY_PROP_CHARGE_FULL:
735                 ret = bq27x00_simple_value(di->cache.charge_full, val);
736                 break;
737         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
738                 ret = bq27x00_simple_value(di->charge_design_full, val);
739                 break;
740         case POWER_SUPPLY_PROP_CYCLE_COUNT:
741                 ret = bq27x00_simple_value(di->cache.cycle_count, val);
742                 break;
743         case POWER_SUPPLY_PROP_ENERGY_NOW:
744                 ret = bq27x00_simple_value(di->cache.energy, val);
745                 break;
746         case POWER_SUPPLY_PROP_POWER_AVG:
747                 ret = bq27x00_simple_value(di->cache.power_avg, val);
748                 break;
749         case POWER_SUPPLY_PROP_HEALTH:
750                 ret = bq27x00_simple_value(di->cache.health, val);
751                 break;
752         default:
753                 return -EINVAL;
754         }
755 
756         return ret;
757 }
758 
759 static void bq27x00_external_power_changed(struct power_supply *psy)
760 {
761         struct bq27x00_device_info *di = power_supply_get_drvdata(psy);
762 
763         cancel_delayed_work_sync(&di->work);
764         schedule_delayed_work(&di->work, 0);
765 }
766 
767 static int bq27x00_powersupply_init(struct bq27x00_device_info *di,
768                                     const char *name)
769 {
770         int ret;
771         struct power_supply_desc *psy_desc;
772         struct power_supply_config psy_cfg = { .drv_data = di, };
773 
774         psy_desc = devm_kzalloc(di->dev, sizeof(*psy_desc), GFP_KERNEL);
775         if (!psy_desc)
776                 return -ENOMEM;
777 
778         psy_desc->name = name;
779         psy_desc->type = POWER_SUPPLY_TYPE_BATTERY;
780         if (di->chip == BQ27425) {
781                 psy_desc->properties = bq27425_battery_props;
782                 psy_desc->num_properties = ARRAY_SIZE(bq27425_battery_props);
783         } else if (di->chip == BQ27742) {
784                 psy_desc->properties = bq27742_battery_props;
785                 psy_desc->num_properties = ARRAY_SIZE(bq27742_battery_props);
786         } else if (di->chip == BQ27510) {
787                 psy_desc->properties = bq27510_battery_props;
788                 psy_desc->num_properties = ARRAY_SIZE(bq27510_battery_props);
789         } else {
790                 psy_desc->properties = bq27x00_battery_props;
791                 psy_desc->num_properties = ARRAY_SIZE(bq27x00_battery_props);
792         }
793         psy_desc->get_property = bq27x00_battery_get_property;
794         psy_desc->external_power_changed = bq27x00_external_power_changed;
795 
796         INIT_DELAYED_WORK(&di->work, bq27x00_battery_poll);
797         mutex_init(&di->lock);
798 
799         di->bat = power_supply_register_no_ws(di->dev, psy_desc, &psy_cfg);
800         if (IS_ERR(di->bat)) {
801                 ret = PTR_ERR(di->bat);
802                 dev_err(di->dev, "failed to register battery: %d\n", ret);
803                 return ret;
804         }
805 
806         dev_info(di->dev, "support ver. %s enabled\n", DRIVER_VERSION);
807 
808         bq27x00_update(di);
809 
810         return 0;
811 }
812 
813 static void bq27x00_powersupply_unregister(struct bq27x00_device_info *di)
814 {
815         /*
816          * power_supply_unregister call bq27x00_battery_get_property which
817          * call bq27x00_battery_poll.
818          * Make sure that bq27x00_battery_poll will not call
819          * schedule_delayed_work again after unregister (which cause OOPS).
820          */
821         poll_interval = 0;
822 
823         cancel_delayed_work_sync(&di->work);
824 
825         power_supply_unregister(di->bat);
826 
827         mutex_destroy(&di->lock);
828 }
829 
830 
831 /* i2c specific code */
832 #ifdef CONFIG_BATTERY_BQ27X00_I2C
833 
834 /* If the system has several batteries we need a different name for each
835  * of them...
836  */
837 static DEFINE_IDR(battery_id);
838 static DEFINE_MUTEX(battery_mutex);
839 
840 static int bq27x00_read_i2c(struct bq27x00_device_info *di, u8 reg, bool single)
841 {
842         struct i2c_client *client = to_i2c_client(di->dev);
843         struct i2c_msg msg[2];
844         unsigned char data[2];
845         int ret;
846 
847         if (!client->adapter)
848                 return -ENODEV;
849 
850         msg[0].addr = client->addr;
851         msg[0].flags = 0;
852         msg[0].buf = &reg;
853         msg[0].len = sizeof(reg);
854         msg[1].addr = client->addr;
855         msg[1].flags = I2C_M_RD;
856         msg[1].buf = data;
857         if (single)
858                 msg[1].len = 1;
859         else
860                 msg[1].len = 2;
861 
862         ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
863         if (ret < 0)
864                 return ret;
865 
866         if (!single)
867                 ret = get_unaligned_le16(data);
868         else
869                 ret = data[0];
870 
871         return ret;
872 }
873 
874 static int bq27x00_battery_probe(struct i2c_client *client,
875                                  const struct i2c_device_id *id)
876 {
877         char *name;
878         struct bq27x00_device_info *di;
879         int num;
880         int retval = 0;
881 
882         /* Get new ID for the new battery device */
883         mutex_lock(&battery_mutex);
884         num = idr_alloc(&battery_id, client, 0, 0, GFP_KERNEL);
885         mutex_unlock(&battery_mutex);
886         if (num < 0)
887                 return num;
888 
889         name = devm_kasprintf(&client->dev, GFP_KERNEL, "%s-%d", id->name, num);
890         if (!name) {
891                 dev_err(&client->dev, "failed to allocate device name\n");
892                 retval = -ENOMEM;
893                 goto batt_failed;
894         }
895 
896         di = devm_kzalloc(&client->dev, sizeof(*di), GFP_KERNEL);
897         if (!di) {
898                 dev_err(&client->dev, "failed to allocate device info data\n");
899                 retval = -ENOMEM;
900                 goto batt_failed;
901         }
902 
903         di->id = num;
904         di->dev = &client->dev;
905         di->chip = id->driver_data;
906         di->bus.read = &bq27x00_read_i2c;
907 
908         retval = bq27x00_powersupply_init(di, name);
909         if (retval)
910                 goto batt_failed;
911 
912         i2c_set_clientdata(client, di);
913 
914         return 0;
915 
916 batt_failed:
917         mutex_lock(&battery_mutex);
918         idr_remove(&battery_id, num);
919         mutex_unlock(&battery_mutex);
920 
921         return retval;
922 }
923 
924 static int bq27x00_battery_remove(struct i2c_client *client)
925 {
926         struct bq27x00_device_info *di = i2c_get_clientdata(client);
927 
928         bq27x00_powersupply_unregister(di);
929 
930         mutex_lock(&battery_mutex);
931         idr_remove(&battery_id, di->id);
932         mutex_unlock(&battery_mutex);
933 
934         return 0;
935 }
936 
937 static const struct i2c_device_id bq27x00_id[] = {
938         { "bq27200", BQ27000 }, /* bq27200 is same as bq27000, but with i2c */
939         { "bq27500", BQ27500 },
940         { "bq27425", BQ27425 },
941         { "bq27742", BQ27742 },
942         { "bq27510", BQ27510 },
943         {},
944 };
945 MODULE_DEVICE_TABLE(i2c, bq27x00_id);
946 
947 static struct i2c_driver bq27x00_battery_driver = {
948         .driver = {
949                 .name = "bq27x00-battery",
950         },
951         .probe = bq27x00_battery_probe,
952         .remove = bq27x00_battery_remove,
953         .id_table = bq27x00_id,
954 };
955 
956 static inline int bq27x00_battery_i2c_init(void)
957 {
958         int ret = i2c_add_driver(&bq27x00_battery_driver);
959         if (ret)
960                 printk(KERN_ERR "Unable to register BQ27x00 i2c driver\n");
961 
962         return ret;
963 }
964 
965 static inline void bq27x00_battery_i2c_exit(void)
966 {
967         i2c_del_driver(&bq27x00_battery_driver);
968 }
969 
970 #else
971 
972 static inline int bq27x00_battery_i2c_init(void) { return 0; }
973 static inline void bq27x00_battery_i2c_exit(void) {};
974 
975 #endif
976 
977 /* platform specific code */
978 #ifdef CONFIG_BATTERY_BQ27X00_PLATFORM
979 
980 static int bq27000_read_platform(struct bq27x00_device_info *di, u8 reg,
981                         bool single)
982 {
983         struct device *dev = di->dev;
984         struct bq27000_platform_data *pdata = dev->platform_data;
985         unsigned int timeout = 3;
986         int upper, lower;
987         int temp;
988 
989         if (!single) {
990                 /* Make sure the value has not changed in between reading the
991                  * lower and the upper part */
992                 upper = pdata->read(dev, reg + 1);
993                 do {
994                         temp = upper;
995                         if (upper < 0)
996                                 return upper;
997 
998                         lower = pdata->read(dev, reg);
999                         if (lower < 0)
1000                                 return lower;
1001 
1002                         upper = pdata->read(dev, reg + 1);
1003                 } while (temp != upper && --timeout);
1004 
1005                 if (timeout == 0)
1006                         return -EIO;
1007 
1008                 return (upper << 8) | lower;
1009         }
1010 
1011         return pdata->read(dev, reg);
1012 }
1013 
1014 static int bq27000_battery_probe(struct platform_device *pdev)
1015 {
1016         struct bq27x00_device_info *di;
1017         struct bq27000_platform_data *pdata = pdev->dev.platform_data;
1018         const char *name;
1019 
1020         if (!pdata) {
1021                 dev_err(&pdev->dev, "no platform_data supplied\n");
1022                 return -EINVAL;
1023         }
1024 
1025         if (!pdata->read) {
1026                 dev_err(&pdev->dev, "no hdq read callback supplied\n");
1027                 return -EINVAL;
1028         }
1029 
1030         di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
1031         if (!di) {
1032                 dev_err(&pdev->dev, "failed to allocate device info data\n");
1033                 return -ENOMEM;
1034         }
1035 
1036         platform_set_drvdata(pdev, di);
1037 
1038         di->dev = &pdev->dev;
1039         di->chip = BQ27000;
1040 
1041         name = pdata->name ?: dev_name(&pdev->dev);
1042         di->bus.read = &bq27000_read_platform;
1043 
1044         return bq27x00_powersupply_init(di, name);
1045 }
1046 
1047 static int bq27000_battery_remove(struct platform_device *pdev)
1048 {
1049         struct bq27x00_device_info *di = platform_get_drvdata(pdev);
1050 
1051         bq27x00_powersupply_unregister(di);
1052 
1053         return 0;
1054 }
1055 
1056 static struct platform_driver bq27000_battery_driver = {
1057         .probe  = bq27000_battery_probe,
1058         .remove = bq27000_battery_remove,
1059         .driver = {
1060                 .name = "bq27000-battery",
1061         },
1062 };
1063 
1064 static inline int bq27x00_battery_platform_init(void)
1065 {
1066         int ret = platform_driver_register(&bq27000_battery_driver);
1067         if (ret)
1068                 printk(KERN_ERR "Unable to register BQ27000 platform driver\n");
1069 
1070         return ret;
1071 }
1072 
1073 static inline void bq27x00_battery_platform_exit(void)
1074 {
1075         platform_driver_unregister(&bq27000_battery_driver);
1076 }
1077 
1078 #else
1079 
1080 static inline int bq27x00_battery_platform_init(void) { return 0; }
1081 static inline void bq27x00_battery_platform_exit(void) {};
1082 
1083 #endif
1084 
1085 /*
1086  * Module stuff
1087  */
1088 
1089 static int __init bq27x00_battery_init(void)
1090 {
1091         int ret;
1092 
1093         ret = bq27x00_battery_i2c_init();
1094         if (ret)
1095                 return ret;
1096 
1097         ret = bq27x00_battery_platform_init();
1098         if (ret)
1099                 bq27x00_battery_i2c_exit();
1100 
1101         return ret;
1102 }
1103 module_init(bq27x00_battery_init);
1104 
1105 static void __exit bq27x00_battery_exit(void)
1106 {
1107         bq27x00_battery_platform_exit();
1108         bq27x00_battery_i2c_exit();
1109 }
1110 module_exit(bq27x00_battery_exit);
1111 
1112 #ifdef CONFIG_BATTERY_BQ27X00_PLATFORM
1113 MODULE_ALIAS("platform:bq27000-battery");
1114 #endif
1115 
1116 #ifdef CONFIG_BATTERY_BQ27X00_I2C
1117 MODULE_ALIAS("i2c:bq27000-battery");
1118 #endif
1119 
1120 MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
1121 MODULE_DESCRIPTION("BQ27x00 battery monitor driver");
1122 MODULE_LICENSE("GPL");
1123 

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