2 * BQ27xxx battery driver
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>
9 * Based on a previous work by Copyright (C) 2008 Texas Instruments, Inc.
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.
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.
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
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>
40 #include <linux/power/bq27xxx_battery.h>
42 #define DRIVER_VERSION "1.2.0"
44 #define BQ27XXX_MANUFACTURER "Texas Instruments"
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
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 */
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)
75 #define BQ27742_POWER_AVG 0x76
77 #define BQ27510_REG_SOC 0x20
78 #define BQ27510_REG_DCAP 0x2E /* Design capacity */
79 #define BQ27510_REG_CYCT 0x1E /* Cycle count total */
81 /* bq27425 register addresses are same as bq27x00 addresses minus 4 */
82 #define BQ27425_REG_OFFSET 0x04
83 #define BQ27425_REG_SOC (0x1C + BQ27425_REG_OFFSET)
84 #define BQ27425_REG_DCAP (0x3C + BQ27425_REG_OFFSET)
86 #define BQ27XXX_RS 20 /* Resistor sense */
87 #define BQ27XXX_POWER_CONSTANT (256 * 29200 / 1000)
89 struct bq27xxx_device_info;
90 struct bq27xxx_access_methods {
91 int (*read)(struct bq27xxx_device_info *di, u8 reg, bool single);
94 enum bq27xxx_chip { BQ27000, BQ27500, BQ27425, BQ27742, BQ27510};
96 struct bq27xxx_reg_cache {
99 int time_to_empty_avg;
110 struct bq27xxx_device_info {
113 enum bq27xxx_chip chip;
115 struct bq27xxx_reg_cache cache;
116 int charge_design_full;
118 unsigned long last_update;
119 struct delayed_work work;
121 struct power_supply *bat;
123 struct bq27xxx_access_methods bus;
128 static enum power_supply_property bq27x00_battery_props[] = {
129 POWER_SUPPLY_PROP_STATUS,
130 POWER_SUPPLY_PROP_PRESENT,
131 POWER_SUPPLY_PROP_VOLTAGE_NOW,
132 POWER_SUPPLY_PROP_CURRENT_NOW,
133 POWER_SUPPLY_PROP_CAPACITY,
134 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
135 POWER_SUPPLY_PROP_TEMP,
136 POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
137 POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
138 POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
139 POWER_SUPPLY_PROP_TECHNOLOGY,
140 POWER_SUPPLY_PROP_CHARGE_FULL,
141 POWER_SUPPLY_PROP_CHARGE_NOW,
142 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
143 POWER_SUPPLY_PROP_CYCLE_COUNT,
144 POWER_SUPPLY_PROP_ENERGY_NOW,
145 POWER_SUPPLY_PROP_POWER_AVG,
146 POWER_SUPPLY_PROP_HEALTH,
147 POWER_SUPPLY_PROP_MANUFACTURER,
150 static enum power_supply_property bq27425_battery_props[] = {
151 POWER_SUPPLY_PROP_STATUS,
152 POWER_SUPPLY_PROP_PRESENT,
153 POWER_SUPPLY_PROP_VOLTAGE_NOW,
154 POWER_SUPPLY_PROP_CURRENT_NOW,
155 POWER_SUPPLY_PROP_CAPACITY,
156 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
157 POWER_SUPPLY_PROP_TEMP,
158 POWER_SUPPLY_PROP_TECHNOLOGY,
159 POWER_SUPPLY_PROP_CHARGE_FULL,
160 POWER_SUPPLY_PROP_CHARGE_NOW,
161 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
162 POWER_SUPPLY_PROP_MANUFACTURER,
165 static enum power_supply_property bq27742_battery_props[] = {
166 POWER_SUPPLY_PROP_STATUS,
167 POWER_SUPPLY_PROP_PRESENT,
168 POWER_SUPPLY_PROP_VOLTAGE_NOW,
169 POWER_SUPPLY_PROP_CURRENT_NOW,
170 POWER_SUPPLY_PROP_CAPACITY,
171 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
172 POWER_SUPPLY_PROP_TEMP,
173 POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
174 POWER_SUPPLY_PROP_TECHNOLOGY,
175 POWER_SUPPLY_PROP_CHARGE_FULL,
176 POWER_SUPPLY_PROP_CHARGE_NOW,
177 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
178 POWER_SUPPLY_PROP_CYCLE_COUNT,
179 POWER_SUPPLY_PROP_POWER_AVG,
180 POWER_SUPPLY_PROP_HEALTH,
181 POWER_SUPPLY_PROP_MANUFACTURER,
184 static enum power_supply_property bq27510_battery_props[] = {
185 POWER_SUPPLY_PROP_STATUS,
186 POWER_SUPPLY_PROP_PRESENT,
187 POWER_SUPPLY_PROP_VOLTAGE_NOW,
188 POWER_SUPPLY_PROP_CURRENT_NOW,
189 POWER_SUPPLY_PROP_CAPACITY,
190 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
191 POWER_SUPPLY_PROP_TEMP,
192 POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
193 POWER_SUPPLY_PROP_TECHNOLOGY,
194 POWER_SUPPLY_PROP_CHARGE_FULL,
195 POWER_SUPPLY_PROP_CHARGE_NOW,
196 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
197 POWER_SUPPLY_PROP_CYCLE_COUNT,
198 POWER_SUPPLY_PROP_POWER_AVG,
199 POWER_SUPPLY_PROP_HEALTH,
200 POWER_SUPPLY_PROP_MANUFACTURER,
203 static unsigned int poll_interval = 360;
204 module_param(poll_interval, uint, 0644);
205 MODULE_PARM_DESC(poll_interval,
206 "battery poll interval in seconds - 0 disables polling");
209 * Common code for BQ27xxx devices
212 static inline int bq27xxx_read(struct bq27xxx_device_info *di, u8 reg,
215 if (di->chip == BQ27425)
216 return di->bus.read(di, reg - BQ27425_REG_OFFSET, single);
217 return di->bus.read(di, reg, single);
221 * Higher versions of the chip like BQ27425 and BQ27500
222 * differ from BQ27000 and BQ27200 in calculation of certain
223 * parameters. Hence we need to check for the chip type.
225 static bool bq27xxx_is_chip_version_higher(struct bq27xxx_device_info *di)
227 if (di->chip == BQ27425 || di->chip == BQ27500 || di->chip == BQ27742
228 || di->chip == BQ27510)
234 * Return the battery Relative State-of-Charge
235 * Or < 0 if something fails.
237 static int bq27xxx_battery_read_rsoc(struct bq27xxx_device_info *di)
241 if (di->chip == BQ27500 || di->chip == BQ27742)
242 rsoc = bq27xxx_read(di, BQ27500_REG_SOC, false);
243 else if (di->chip == BQ27510)
244 rsoc = bq27xxx_read(di, BQ27510_REG_SOC, false);
245 else if (di->chip == BQ27425)
246 rsoc = bq27xxx_read(di, BQ27425_REG_SOC, false);
248 rsoc = bq27xxx_read(di, BQ27000_REG_RSOC, true);
251 dev_dbg(di->dev, "error reading relative State-of-Charge\n");
257 * Return a battery charge value in µAh
258 * Or < 0 if something fails.
260 static int bq27xxx_battery_read_charge(struct bq27xxx_device_info *di, u8 reg)
264 charge = bq27xxx_read(di, reg, false);
266 dev_dbg(di->dev, "error reading charge register %02x: %d\n",
271 if (bq27xxx_is_chip_version_higher(di))
274 charge = charge * 3570 / BQ27XXX_RS;
280 * Return the battery Nominal available capaciy in µAh
281 * Or < 0 if something fails.
283 static inline int bq27xxx_battery_read_nac(struct bq27xxx_device_info *di)
286 bool is_bq27500 = di->chip == BQ27500;
287 bool is_bq27742 = di->chip == BQ27742;
288 bool is_higher = bq27xxx_is_chip_version_higher(di);
289 bool flags_1b = !(is_bq27500 || is_bq27742);
291 flags = bq27xxx_read(di, BQ27x00_REG_FLAGS, flags_1b);
292 if (flags >= 0 && !is_higher && (flags & BQ27000_FLAG_CI))
295 return bq27xxx_battery_read_charge(di, BQ27x00_REG_NAC);
299 * Return the battery Last measured discharge in µAh
300 * Or < 0 if something fails.
302 static inline int bq27xxx_battery_read_lmd(struct bq27xxx_device_info *di)
304 return bq27xxx_battery_read_charge(di, BQ27x00_REG_LMD);
308 * Return the battery Initial last measured discharge in µAh
309 * Or < 0 if something fails.
311 static int bq27xxx_battery_read_ilmd(struct bq27xxx_device_info *di)
315 if (bq27xxx_is_chip_version_higher(di)) {
316 if (di->chip == BQ27425)
317 ilmd = bq27xxx_read(di, BQ27425_REG_DCAP, false);
318 else if (di->chip == BQ27510)
319 ilmd = bq27xxx_read(di, BQ27510_REG_DCAP, false);
321 ilmd = bq27xxx_read(di, BQ27500_REG_DCAP, false);
323 ilmd = bq27xxx_read(di, BQ27000_REG_ILMD, true);
327 dev_dbg(di->dev, "error reading initial last measured discharge\n");
331 if (bq27xxx_is_chip_version_higher(di))
334 ilmd = ilmd * 256 * 3570 / BQ27XXX_RS;
340 * Return the battery Available energy in µWh
341 * Or < 0 if something fails.
343 static int bq27xxx_battery_read_energy(struct bq27xxx_device_info *di)
347 ae = bq27xxx_read(di, BQ27x00_REG_AE, false);
349 dev_dbg(di->dev, "error reading available energy\n");
353 if (di->chip == BQ27500)
356 ae = ae * 29200 / BQ27XXX_RS;
362 * Return the battery temperature in tenths of degree Kelvin
363 * Or < 0 if something fails.
365 static int bq27xxx_battery_read_temperature(struct bq27xxx_device_info *di)
369 temp = bq27xxx_read(di, BQ27x00_REG_TEMP, false);
371 dev_err(di->dev, "error reading temperature\n");
375 if (!bq27xxx_is_chip_version_higher(di))
382 * Return the battery Cycle count total
383 * Or < 0 if something fails.
385 static int bq27xxx_battery_read_cyct(struct bq27xxx_device_info *di)
389 if (di->chip == BQ27510)
390 cyct = bq27xxx_read(di, BQ27510_REG_CYCT, false);
392 cyct = bq27xxx_read(di, BQ27x00_REG_CYCT, false);
394 dev_err(di->dev, "error reading cycle count total\n");
400 * Read a time register.
401 * Return < 0 if something fails.
403 static int bq27xxx_battery_read_time(struct bq27xxx_device_info *di, u8 reg)
407 tval = bq27xxx_read(di, reg, false);
409 dev_dbg(di->dev, "error reading time register %02x: %d\n",
421 * Read a power avg register.
422 * Return < 0 if something fails.
424 static int bq27xxx_battery_read_pwr_avg(struct bq27xxx_device_info *di, u8 reg)
428 tval = bq27xxx_read(di, reg, false);
430 dev_err(di->dev, "error reading power avg rgister %02x: %d\n",
435 if (di->chip == BQ27500)
438 return (tval * BQ27XXX_POWER_CONSTANT) / BQ27XXX_RS;
442 * Read flag register.
443 * Return < 0 if something fails.
445 static int bq27xxx_battery_read_health(struct bq27xxx_device_info *di)
449 tval = bq27xxx_read(di, BQ27x00_REG_FLAGS, false);
451 dev_err(di->dev, "error reading flag register:%d\n", tval);
455 if (di->chip == BQ27500) {
456 if (tval & BQ27500_FLAG_SOCF)
457 tval = POWER_SUPPLY_HEALTH_DEAD;
458 else if (tval & BQ27500_FLAG_OTC)
459 tval = POWER_SUPPLY_HEALTH_OVERHEAT;
461 tval = POWER_SUPPLY_HEALTH_GOOD;
463 } else if (di->chip == BQ27510) {
464 if (tval & BQ27500_FLAG_OTC)
465 return POWER_SUPPLY_HEALTH_OVERHEAT;
466 return POWER_SUPPLY_HEALTH_GOOD;
468 if (tval & BQ27000_FLAG_EDV1)
469 tval = POWER_SUPPLY_HEALTH_DEAD;
471 tval = POWER_SUPPLY_HEALTH_GOOD;
478 static void bq27xxx_battery_update(struct bq27xxx_device_info *di)
480 struct bq27xxx_reg_cache cache = {0, };
481 bool is_bq27500 = di->chip == BQ27500;
482 bool is_bq27510 = di->chip == BQ27510;
483 bool is_bq27425 = di->chip == BQ27425;
484 bool is_bq27742 = di->chip == BQ27742;
485 bool flags_1b = !(is_bq27500 || is_bq27742);
487 cache.flags = bq27xxx_read(di, BQ27x00_REG_FLAGS, flags_1b);
488 if ((cache.flags & 0xff) == 0xff)
491 if (cache.flags >= 0) {
492 if (!is_bq27500 && !is_bq27425 && !is_bq27742 && !is_bq27510
493 && (cache.flags & BQ27000_FLAG_CI)) {
494 dev_info(di->dev, "battery is not calibrated! ignoring capacity values\n");
495 cache.capacity = -ENODATA;
496 cache.energy = -ENODATA;
497 cache.time_to_empty = -ENODATA;
498 cache.time_to_empty_avg = -ENODATA;
499 cache.time_to_full = -ENODATA;
500 cache.charge_full = -ENODATA;
501 cache.health = -ENODATA;
503 cache.capacity = bq27xxx_battery_read_rsoc(di);
504 if (is_bq27742 || is_bq27510)
505 cache.time_to_empty =
506 bq27xxx_battery_read_time(di,
508 else if (!is_bq27425) {
509 cache.energy = bq27xxx_battery_read_energy(di);
510 cache.time_to_empty =
511 bq27xxx_battery_read_time(di,
513 cache.time_to_empty_avg =
514 bq27xxx_battery_read_time(di,
517 bq27xxx_battery_read_time(di,
520 cache.charge_full = bq27xxx_battery_read_lmd(di);
521 cache.health = bq27xxx_battery_read_health(di);
523 cache.temperature = bq27xxx_battery_read_temperature(di);
525 cache.cycle_count = bq27xxx_battery_read_cyct(di);
528 bq27xxx_battery_read_pwr_avg(di,
532 bq27xxx_battery_read_pwr_avg(di,
535 /* We only have to read charge design full once */
536 if (di->charge_design_full <= 0)
537 di->charge_design_full = bq27xxx_battery_read_ilmd(di);
540 if (di->cache.capacity != cache.capacity)
541 power_supply_changed(di->bat);
543 if (memcmp(&di->cache, &cache, sizeof(cache)) != 0)
546 di->last_update = jiffies;
549 static void bq27xxx_battery_poll(struct work_struct *work)
551 struct bq27xxx_device_info *di =
552 container_of(work, struct bq27xxx_device_info, work.work);
554 bq27xxx_battery_update(di);
556 if (poll_interval > 0) {
557 /* The timer does not have to be accurate. */
558 set_timer_slack(&di->work.timer, poll_interval * HZ / 4);
559 schedule_delayed_work(&di->work, poll_interval * HZ);
564 * Return the battery average current in µA
565 * Note that current can be negative signed as well
566 * Or 0 if something fails.
568 static int bq27xxx_battery_current(struct bq27xxx_device_info *di,
569 union power_supply_propval *val)
574 curr = bq27xxx_read(di, BQ27x00_REG_AI, false);
576 dev_err(di->dev, "error reading current\n");
580 if (bq27xxx_is_chip_version_higher(di)) {
581 /* bq27500 returns signed value */
582 val->intval = (int)((s16)curr) * 1000;
584 flags = bq27xxx_read(di, BQ27x00_REG_FLAGS, false);
585 if (flags & BQ27000_FLAG_CHGS) {
586 dev_dbg(di->dev, "negative current!\n");
590 val->intval = curr * 3570 / BQ27XXX_RS;
596 static int bq27xxx_battery_status(struct bq27xxx_device_info *di,
597 union power_supply_propval *val)
601 if (bq27xxx_is_chip_version_higher(di)) {
602 if (di->cache.flags & BQ27500_FLAG_FC)
603 status = POWER_SUPPLY_STATUS_FULL;
604 else if (di->cache.flags & BQ27500_FLAG_DSC)
605 status = POWER_SUPPLY_STATUS_DISCHARGING;
607 status = POWER_SUPPLY_STATUS_CHARGING;
609 if (di->cache.flags & BQ27000_FLAG_FC)
610 status = POWER_SUPPLY_STATUS_FULL;
611 else if (di->cache.flags & BQ27000_FLAG_CHGS)
612 status = POWER_SUPPLY_STATUS_CHARGING;
613 else if (power_supply_am_i_supplied(di->bat))
614 status = POWER_SUPPLY_STATUS_NOT_CHARGING;
616 status = POWER_SUPPLY_STATUS_DISCHARGING;
619 val->intval = status;
624 static int bq27xxx_battery_capacity_level(struct bq27xxx_device_info *di,
625 union power_supply_propval *val)
629 if (bq27xxx_is_chip_version_higher(di)) {
630 if (di->cache.flags & BQ27500_FLAG_FC)
631 level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
632 else if (di->cache.flags & BQ27500_FLAG_SOC1)
633 level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
634 else if (di->cache.flags & BQ27500_FLAG_SOCF)
635 level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
637 level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
639 if (di->cache.flags & BQ27000_FLAG_FC)
640 level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
641 else if (di->cache.flags & BQ27000_FLAG_EDV1)
642 level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
643 else if (di->cache.flags & BQ27000_FLAG_EDVF)
644 level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
646 level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
655 * Return the battery Voltage in millivolts
656 * Or < 0 if something fails.
658 static int bq27xxx_battery_voltage(struct bq27xxx_device_info *di,
659 union power_supply_propval *val)
663 volt = bq27xxx_read(di, BQ27x00_REG_VOLT, false);
665 dev_err(di->dev, "error reading voltage\n");
669 val->intval = volt * 1000;
674 static int bq27xxx_simple_value(int value,
675 union power_supply_propval *val)
685 static int bq27xxx_battery_get_property(struct power_supply *psy,
686 enum power_supply_property psp,
687 union power_supply_propval *val)
690 struct bq27xxx_device_info *di = power_supply_get_drvdata(psy);
692 mutex_lock(&di->lock);
693 if (time_is_before_jiffies(di->last_update + 5 * HZ)) {
694 cancel_delayed_work_sync(&di->work);
695 bq27xxx_battery_poll(&di->work.work);
697 mutex_unlock(&di->lock);
699 if (psp != POWER_SUPPLY_PROP_PRESENT && di->cache.flags < 0)
703 case POWER_SUPPLY_PROP_STATUS:
704 ret = bq27xxx_battery_status(di, val);
706 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
707 ret = bq27xxx_battery_voltage(di, val);
709 case POWER_SUPPLY_PROP_PRESENT:
710 val->intval = di->cache.flags < 0 ? 0 : 1;
712 case POWER_SUPPLY_PROP_CURRENT_NOW:
713 ret = bq27xxx_battery_current(di, val);
715 case POWER_SUPPLY_PROP_CAPACITY:
716 ret = bq27xxx_simple_value(di->cache.capacity, val);
718 case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
719 ret = bq27xxx_battery_capacity_level(di, val);
721 case POWER_SUPPLY_PROP_TEMP:
722 ret = bq27xxx_simple_value(di->cache.temperature, val);
726 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
727 ret = bq27xxx_simple_value(di->cache.time_to_empty, val);
729 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
730 ret = bq27xxx_simple_value(di->cache.time_to_empty_avg, val);
732 case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
733 ret = bq27xxx_simple_value(di->cache.time_to_full, val);
735 case POWER_SUPPLY_PROP_TECHNOLOGY:
736 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
738 case POWER_SUPPLY_PROP_CHARGE_NOW:
739 ret = bq27xxx_simple_value(bq27xxx_battery_read_nac(di), val);
741 case POWER_SUPPLY_PROP_CHARGE_FULL:
742 ret = bq27xxx_simple_value(di->cache.charge_full, val);
744 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
745 ret = bq27xxx_simple_value(di->charge_design_full, val);
747 case POWER_SUPPLY_PROP_CYCLE_COUNT:
748 ret = bq27xxx_simple_value(di->cache.cycle_count, val);
750 case POWER_SUPPLY_PROP_ENERGY_NOW:
751 ret = bq27xxx_simple_value(di->cache.energy, val);
753 case POWER_SUPPLY_PROP_POWER_AVG:
754 ret = bq27xxx_simple_value(di->cache.power_avg, val);
756 case POWER_SUPPLY_PROP_HEALTH:
757 ret = bq27xxx_simple_value(di->cache.health, val);
759 case POWER_SUPPLY_PROP_MANUFACTURER:
760 val->strval = BQ27XXX_MANUFACTURER;
769 static void bq27xxx_external_power_changed(struct power_supply *psy)
771 struct bq27xxx_device_info *di = power_supply_get_drvdata(psy);
773 cancel_delayed_work_sync(&di->work);
774 schedule_delayed_work(&di->work, 0);
777 static int bq27xxx_powersupply_init(struct bq27xxx_device_info *di,
781 struct power_supply_desc *psy_desc;
782 struct power_supply_config psy_cfg = { .drv_data = di, };
784 psy_desc = devm_kzalloc(di->dev, sizeof(*psy_desc), GFP_KERNEL);
788 psy_desc->name = name;
789 psy_desc->type = POWER_SUPPLY_TYPE_BATTERY;
790 if (di->chip == BQ27425) {
791 psy_desc->properties = bq27425_battery_props;
792 psy_desc->num_properties = ARRAY_SIZE(bq27425_battery_props);
793 } else if (di->chip == BQ27742) {
794 psy_desc->properties = bq27742_battery_props;
795 psy_desc->num_properties = ARRAY_SIZE(bq27742_battery_props);
796 } else if (di->chip == BQ27510) {
797 psy_desc->properties = bq27510_battery_props;
798 psy_desc->num_properties = ARRAY_SIZE(bq27510_battery_props);
800 psy_desc->properties = bq27x00_battery_props;
801 psy_desc->num_properties = ARRAY_SIZE(bq27x00_battery_props);
803 psy_desc->get_property = bq27xxx_battery_get_property;
804 psy_desc->external_power_changed = bq27xxx_external_power_changed;
806 INIT_DELAYED_WORK(&di->work, bq27xxx_battery_poll);
807 mutex_init(&di->lock);
809 di->bat = power_supply_register_no_ws(di->dev, psy_desc, &psy_cfg);
810 if (IS_ERR(di->bat)) {
811 ret = PTR_ERR(di->bat);
812 dev_err(di->dev, "failed to register battery: %d\n", ret);
816 dev_info(di->dev, "support ver. %s enabled\n", DRIVER_VERSION);
818 bq27xxx_battery_update(di);
823 static void bq27xxx_powersupply_unregister(struct bq27xxx_device_info *di)
826 * power_supply_unregister call bq27xxx_battery_get_property which
827 * call bq27xxx_battery_poll.
828 * Make sure that bq27xxx_battery_poll will not call
829 * schedule_delayed_work again after unregister (which cause OOPS).
833 cancel_delayed_work_sync(&di->work);
835 power_supply_unregister(di->bat);
837 mutex_destroy(&di->lock);
840 /* i2c specific code */
841 #ifdef CONFIG_BATTERY_BQ27XXX_I2C
843 /* If the system has several batteries we need a different name for each
846 static DEFINE_IDR(battery_id);
847 static DEFINE_MUTEX(battery_mutex);
849 static int bq27xxx_battery_i2c_read(struct bq27xxx_device_info *di, u8 reg,
852 struct i2c_client *client = to_i2c_client(di->dev);
853 struct i2c_msg msg[2];
854 unsigned char data[2];
857 if (!client->adapter)
860 msg[0].addr = client->addr;
863 msg[0].len = sizeof(reg);
864 msg[1].addr = client->addr;
865 msg[1].flags = I2C_M_RD;
872 ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
877 ret = get_unaligned_le16(data);
884 static int bq27xxx_battery_i2c_probe(struct i2c_client *client,
885 const struct i2c_device_id *id)
888 struct bq27xxx_device_info *di;
892 /* Get new ID for the new battery device */
893 mutex_lock(&battery_mutex);
894 num = idr_alloc(&battery_id, client, 0, 0, GFP_KERNEL);
895 mutex_unlock(&battery_mutex);
899 name = devm_kasprintf(&client->dev, GFP_KERNEL, "%s-%d", id->name, num);
905 di = devm_kzalloc(&client->dev, sizeof(*di), GFP_KERNEL);
912 di->dev = &client->dev;
913 di->chip = id->driver_data;
914 di->bus.read = &bq27xxx_battery_i2c_read;
916 retval = bq27xxx_powersupply_init(di, name);
920 i2c_set_clientdata(client, di);
925 mutex_lock(&battery_mutex);
926 idr_remove(&battery_id, num);
927 mutex_unlock(&battery_mutex);
932 static int bq27xxx_battery_i2c_remove(struct i2c_client *client)
934 struct bq27xxx_device_info *di = i2c_get_clientdata(client);
936 bq27xxx_powersupply_unregister(di);
938 mutex_lock(&battery_mutex);
939 idr_remove(&battery_id, di->id);
940 mutex_unlock(&battery_mutex);
945 static const struct i2c_device_id bq27xxx_id[] = {
946 { "bq27200", BQ27000 }, /* bq27200 is same as bq27000, but with i2c */
947 { "bq27500", BQ27500 },
948 { "bq27425", BQ27425 },
949 { "bq27742", BQ27742 },
950 { "bq27510", BQ27510 },
953 MODULE_DEVICE_TABLE(i2c, bq27xxx_id);
955 static struct i2c_driver bq27xxx_battery_i2c_driver = {
957 .name = "bq27xxx-battery",
959 .probe = bq27xxx_battery_i2c_probe,
960 .remove = bq27xxx_battery_i2c_remove,
961 .id_table = bq27xxx_id,
964 static inline int bq27xxx_battery_i2c_init(void)
966 int ret = i2c_add_driver(&bq27xxx_battery_i2c_driver);
969 pr_err("Unable to register BQ27xxx i2c driver\n");
974 static inline void bq27xxx_battery_i2c_exit(void)
976 i2c_del_driver(&bq27xxx_battery_i2c_driver);
981 static inline int bq27xxx_battery_i2c_init(void) { return 0; }
982 static inline void bq27xxx_battery_i2c_exit(void) {};
986 /* platform specific code */
987 #ifdef CONFIG_BATTERY_BQ27XXX_PLATFORM
989 static int bq27xxx_battery_platform_read(struct bq27xxx_device_info *di, u8 reg,
992 struct device *dev = di->dev;
993 struct bq27xxx_platform_data *pdata = dev->platform_data;
994 unsigned int timeout = 3;
999 /* Make sure the value has not changed in between reading the
1000 * lower and the upper part */
1001 upper = pdata->read(dev, reg + 1);
1007 lower = pdata->read(dev, reg);
1011 upper = pdata->read(dev, reg + 1);
1012 } while (temp != upper && --timeout);
1017 return (upper << 8) | lower;
1020 return pdata->read(dev, reg);
1023 static int bq27xxx_battery_platform_probe(struct platform_device *pdev)
1025 struct bq27xxx_device_info *di;
1026 struct bq27xxx_platform_data *pdata = pdev->dev.platform_data;
1030 dev_err(&pdev->dev, "no platform_data supplied\n");
1035 dev_err(&pdev->dev, "no hdq read callback supplied\n");
1039 di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
1043 platform_set_drvdata(pdev, di);
1045 di->dev = &pdev->dev;
1048 name = pdata->name ?: dev_name(&pdev->dev);
1049 di->bus.read = &bq27xxx_battery_platform_read;
1051 return bq27xxx_powersupply_init(di, name);
1054 static int bq27xxx_battery_platform_remove(struct platform_device *pdev)
1056 struct bq27xxx_device_info *di = platform_get_drvdata(pdev);
1058 bq27xxx_powersupply_unregister(di);
1063 static struct platform_driver bq27xxx_battery_platform_driver = {
1064 .probe = bq27xxx_battery_platform_probe,
1065 .remove = bq27xxx_battery_platform_remove,
1067 .name = "bq27000-battery",
1071 static inline int bq27xxx_battery_platform_init(void)
1073 int ret = platform_driver_register(&bq27xxx_battery_platform_driver);
1076 pr_err("Unable to register BQ27xxx platform driver\n");
1081 static inline void bq27xxx_battery_platform_exit(void)
1083 platform_driver_unregister(&bq27xxx_battery_platform_driver);
1088 static inline int bq27xxx_battery_platform_init(void) { return 0; }
1089 static inline void bq27xxx_battery_platform_exit(void) {};
1097 static int __init bq27xxx_battery_init(void)
1101 ret = bq27xxx_battery_i2c_init();
1105 ret = bq27xxx_battery_platform_init();
1107 bq27xxx_battery_i2c_exit();
1111 module_init(bq27xxx_battery_init);
1113 static void __exit bq27xxx_battery_exit(void)
1115 bq27xxx_battery_platform_exit();
1116 bq27xxx_battery_i2c_exit();
1118 module_exit(bq27xxx_battery_exit);
1120 #ifdef CONFIG_BATTERY_BQ27XXX_PLATFORM
1121 MODULE_ALIAS("platform:bq27000-battery");
1124 MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
1125 MODULE_DESCRIPTION("BQ27xxx battery monitor driver");
1126 MODULE_LICENSE("GPL");