2 * BQ27x00 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.
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
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>
42 #include <linux/power/bq27x00_battery.h>
44 #define DRIVER_VERSION "1.2.0"
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 /* 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)
82 #define BQ27000_RS 20 /* Resistor sense */
83 #define BQ27x00_POWER_CONSTANT (256 * 29200 / 1000)
85 struct bq27x00_device_info;
86 struct bq27x00_access_methods {
87 int (*read)(struct bq27x00_device_info *di, u8 reg, bool single);
90 enum bq27x00_chip { BQ27000, BQ27500, BQ27425, BQ27742};
92 struct bq27x00_reg_cache {
95 int time_to_empty_avg;
106 struct bq27x00_device_info {
109 enum bq27x00_chip chip;
111 struct bq27x00_reg_cache cache;
112 int charge_design_full;
114 unsigned long last_update;
115 struct delayed_work work;
117 struct power_supply bat;
119 struct bq27x00_access_methods bus;
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,
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,
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,
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");
183 * Common code for BQ27x00 devices
186 static inline int bq27x00_read(struct bq27x00_device_info *di, u8 reg,
189 if (di->chip == BQ27425)
190 return di->bus.read(di, reg - BQ27425_REG_OFFSET, single);
191 return di->bus.read(di, reg, single);
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.
199 static bool bq27xxx_is_chip_version_higher(struct bq27x00_device_info *di)
201 if (di->chip == BQ27425 || di->chip == BQ27500 || di->chip == BQ27742)
207 * Return the battery Relative State-of-Charge
208 * Or < 0 if something fails.
210 static int bq27x00_battery_read_rsoc(struct bq27x00_device_info *di)
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);
219 rsoc = bq27x00_read(di, BQ27000_REG_RSOC, true);
222 dev_dbg(di->dev, "error reading relative State-of-Charge\n");
228 * Return a battery charge value in µAh
229 * Or < 0 if something fails.
231 static int bq27x00_battery_read_charge(struct bq27x00_device_info *di, u8 reg)
235 charge = bq27x00_read(di, reg, false);
237 dev_dbg(di->dev, "error reading charge register %02x: %d\n",
242 if (bq27xxx_is_chip_version_higher(di))
245 charge = charge * 3570 / BQ27000_RS;
251 * Return the battery Nominal available capaciy in µAh
252 * Or < 0 if something fails.
254 static inline int bq27x00_battery_read_nac(struct bq27x00_device_info *di)
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);
262 flags = bq27x00_read(di, BQ27x00_REG_FLAGS, flags_1b);
263 if (flags >= 0 && !is_higher && (flags & BQ27000_FLAG_CI))
266 return bq27x00_battery_read_charge(di, BQ27x00_REG_NAC);
270 * Return the battery Last measured discharge in µAh
271 * Or < 0 if something fails.
273 static inline int bq27x00_battery_read_lmd(struct bq27x00_device_info *di)
275 return bq27x00_battery_read_charge(di, BQ27x00_REG_LMD);
279 * Return the battery Initial last measured discharge in µAh
280 * Or < 0 if something fails.
282 static int bq27x00_battery_read_ilmd(struct bq27x00_device_info *di)
286 if (bq27xxx_is_chip_version_higher(di)) {
287 if (di->chip == BQ27425)
288 ilmd = bq27x00_read(di, BQ27425_REG_DCAP, false);
290 ilmd = bq27x00_read(di, BQ27500_REG_DCAP, false);
292 ilmd = bq27x00_read(di, BQ27000_REG_ILMD, true);
295 dev_dbg(di->dev, "error reading initial last measured discharge\n");
299 if (bq27xxx_is_chip_version_higher(di))
302 ilmd = ilmd * 256 * 3570 / BQ27000_RS;
308 * Return the battery Available energy in µWh
309 * Or < 0 if something fails.
311 static int bq27x00_battery_read_energy(struct bq27x00_device_info *di)
315 ae = bq27x00_read(di, BQ27x00_REG_AE, false);
317 dev_dbg(di->dev, "error reading available energy\n");
321 if (di->chip == BQ27500)
324 ae = ae * 29200 / BQ27000_RS;
330 * Return the battery temperature in tenths of degree Kelvin
331 * Or < 0 if something fails.
333 static int bq27x00_battery_read_temperature(struct bq27x00_device_info *di)
337 temp = bq27x00_read(di, BQ27x00_REG_TEMP, false);
339 dev_err(di->dev, "error reading temperature\n");
343 if (!bq27xxx_is_chip_version_higher(di))
350 * Return the battery Cycle count total
351 * Or < 0 if something fails.
353 static int bq27x00_battery_read_cyct(struct bq27x00_device_info *di)
357 cyct = bq27x00_read(di, BQ27x00_REG_CYCT, false);
359 dev_err(di->dev, "error reading cycle count total\n");
365 * Read a time register.
366 * Return < 0 if something fails.
368 static int bq27x00_battery_read_time(struct bq27x00_device_info *di, u8 reg)
372 tval = bq27x00_read(di, reg, false);
374 dev_dbg(di->dev, "error reading time register %02x: %d\n",
386 * Read a power avg register.
387 * Return < 0 if something fails.
389 static int bq27x00_battery_read_pwr_avg(struct bq27x00_device_info *di, u8 reg)
393 tval = bq27x00_read(di, reg, false);
395 dev_err(di->dev, "error reading power avg rgister %02x: %d\n",
400 if (di->chip == BQ27500)
403 return (tval * BQ27x00_POWER_CONSTANT) / BQ27000_RS;
407 * Read flag register.
408 * Return < 0 if something fails.
410 static int bq27x00_battery_read_health(struct bq27x00_device_info *di)
414 tval = bq27x00_read(di, BQ27x00_REG_FLAGS, false);
416 dev_err(di->dev, "error reading flag register:%d\n", tval);
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;
426 tval = POWER_SUPPLY_HEALTH_GOOD;
429 if (tval & BQ27000_FLAG_EDV1)
430 tval = POWER_SUPPLY_HEALTH_DEAD;
432 tval = POWER_SUPPLY_HEALTH_GOOD;
439 static void bq27x00_update(struct bq27x00_device_info *di)
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);
447 cache.flags = bq27x00_read(di, BQ27x00_REG_FLAGS, flags_1b);
448 if ((cache.flags & 0xff) == 0xff)
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;
463 cache.capacity = bq27x00_battery_read_rsoc(di);
465 cache.time_to_empty =
466 bq27x00_battery_read_time(di,
468 else if (!is_bq27425) {
469 cache.energy = bq27x00_battery_read_energy(di);
470 cache.time_to_empty =
471 bq27x00_battery_read_time(di,
473 cache.time_to_empty_avg =
474 bq27x00_battery_read_time(di,
477 bq27x00_battery_read_time(di,
480 cache.charge_full = bq27x00_battery_read_lmd(di);
481 cache.health = bq27x00_battery_read_health(di);
483 cache.temperature = bq27x00_battery_read_temperature(di);
485 cache.cycle_count = bq27x00_battery_read_cyct(di);
488 bq27x00_battery_read_pwr_avg(di,
492 bq27x00_battery_read_pwr_avg(di,
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);
500 if (di->cache.capacity != cache.capacity)
501 power_supply_changed(&di->bat);
503 if (memcmp(&di->cache, &cache, sizeof(cache)) != 0)
506 di->last_update = jiffies;
509 static void bq27x00_battery_poll(struct work_struct *work)
511 struct bq27x00_device_info *di =
512 container_of(work, struct bq27x00_device_info, work.work);
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);
524 * Return the battery average current in µA
525 * Note that current can be negative signed as well
526 * Or 0 if something fails.
528 static int bq27x00_battery_current(struct bq27x00_device_info *di,
529 union power_supply_propval *val)
534 curr = bq27x00_read(di, BQ27x00_REG_AI, false);
536 dev_err(di->dev, "error reading current\n");
540 if (bq27xxx_is_chip_version_higher(di)) {
541 /* bq27500 returns signed value */
542 val->intval = (int)((s16)curr) * 1000;
544 flags = bq27x00_read(di, BQ27x00_REG_FLAGS, false);
545 if (flags & BQ27000_FLAG_CHGS) {
546 dev_dbg(di->dev, "negative current!\n");
550 val->intval = curr * 3570 / BQ27000_RS;
556 static int bq27x00_battery_status(struct bq27x00_device_info *di,
557 union power_supply_propval *val)
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;
567 status = POWER_SUPPLY_STATUS_CHARGING;
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;
576 status = POWER_SUPPLY_STATUS_DISCHARGING;
579 val->intval = status;
584 static int bq27x00_battery_capacity_level(struct bq27x00_device_info *di,
585 union power_supply_propval *val)
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;
597 level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
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;
606 level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
615 * Return the battery Voltage in millivolts
616 * Or < 0 if something fails.
618 static int bq27x00_battery_voltage(struct bq27x00_device_info *di,
619 union power_supply_propval *val)
623 volt = bq27x00_read(di, BQ27x00_REG_VOLT, false);
625 dev_err(di->dev, "error reading voltage\n");
629 val->intval = volt * 1000;
634 static int bq27x00_simple_value(int value,
635 union power_supply_propval *val)
645 #define to_bq27x00_device_info(x) container_of((x), \
646 struct bq27x00_device_info, bat);
648 static int bq27x00_battery_get_property(struct power_supply *psy,
649 enum power_supply_property psp,
650 union power_supply_propval *val)
653 struct bq27x00_device_info *di = to_bq27x00_device_info(psy);
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);
660 mutex_unlock(&di->lock);
662 if (psp != POWER_SUPPLY_PROP_PRESENT && di->cache.flags < 0)
666 case POWER_SUPPLY_PROP_STATUS:
667 ret = bq27x00_battery_status(di, val);
669 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
670 ret = bq27x00_battery_voltage(di, val);
672 case POWER_SUPPLY_PROP_PRESENT:
673 val->intval = di->cache.flags < 0 ? 0 : 1;
675 case POWER_SUPPLY_PROP_CURRENT_NOW:
676 ret = bq27x00_battery_current(di, val);
678 case POWER_SUPPLY_PROP_CAPACITY:
679 ret = bq27x00_simple_value(di->cache.capacity, val);
681 case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
682 ret = bq27x00_battery_capacity_level(di, val);
684 case POWER_SUPPLY_PROP_TEMP:
685 ret = bq27x00_simple_value(di->cache.temperature, val);
689 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
690 ret = bq27x00_simple_value(di->cache.time_to_empty, val);
692 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
693 ret = bq27x00_simple_value(di->cache.time_to_empty_avg, val);
695 case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
696 ret = bq27x00_simple_value(di->cache.time_to_full, val);
698 case POWER_SUPPLY_PROP_TECHNOLOGY:
699 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
701 case POWER_SUPPLY_PROP_CHARGE_NOW:
702 ret = bq27x00_simple_value(bq27x00_battery_read_nac(di), val);
704 case POWER_SUPPLY_PROP_CHARGE_FULL:
705 ret = bq27x00_simple_value(di->cache.charge_full, val);
707 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
708 ret = bq27x00_simple_value(di->charge_design_full, val);
710 case POWER_SUPPLY_PROP_CYCLE_COUNT:
711 ret = bq27x00_simple_value(di->cache.cycle_count, val);
713 case POWER_SUPPLY_PROP_ENERGY_NOW:
714 ret = bq27x00_simple_value(di->cache.energy, val);
716 case POWER_SUPPLY_PROP_POWER_AVG:
717 ret = bq27x00_simple_value(di->cache.power_avg, val);
719 case POWER_SUPPLY_PROP_HEALTH:
720 ret = bq27x00_simple_value(di->cache.health, val);
729 static void bq27x00_external_power_changed(struct power_supply *psy)
731 struct bq27x00_device_info *di = to_bq27x00_device_info(psy);
733 cancel_delayed_work_sync(&di->work);
734 schedule_delayed_work(&di->work, 0);
737 static int bq27x00_powersupply_init(struct bq27x00_device_info *di)
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);
749 di->bat.properties = bq27x00_battery_props;
750 di->bat.num_properties = ARRAY_SIZE(bq27x00_battery_props);
752 di->bat.get_property = bq27x00_battery_get_property;
753 di->bat.external_power_changed = bq27x00_external_power_changed;
755 INIT_DELAYED_WORK(&di->work, bq27x00_battery_poll);
756 mutex_init(&di->lock);
758 ret = power_supply_register(di->dev, &di->bat);
760 dev_err(di->dev, "failed to register battery: %d\n", ret);
764 dev_info(di->dev, "support ver. %s enabled\n", DRIVER_VERSION);
771 static void bq27x00_powersupply_unregister(struct bq27x00_device_info *di)
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).
781 cancel_delayed_work_sync(&di->work);
783 power_supply_unregister(&di->bat);
785 mutex_destroy(&di->lock);
789 /* i2c specific code */
790 #ifdef CONFIG_BATTERY_BQ27X00_I2C
792 /* If the system has several batteries we need a different name for each
795 static DEFINE_IDR(battery_id);
796 static DEFINE_MUTEX(battery_mutex);
798 static int bq27x00_read_i2c(struct bq27x00_device_info *di, u8 reg, bool single)
800 struct i2c_client *client = to_i2c_client(di->dev);
801 struct i2c_msg msg[2];
802 unsigned char data[2];
805 if (!client->adapter)
808 msg[0].addr = client->addr;
811 msg[0].len = sizeof(reg);
812 msg[1].addr = client->addr;
813 msg[1].flags = I2C_M_RD;
820 ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
825 ret = get_unaligned_le16(data);
832 static int bq27x00_battery_probe(struct i2c_client *client,
833 const struct i2c_device_id *id)
836 struct bq27x00_device_info *di;
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);
847 name = kasprintf(GFP_KERNEL, "%s-%d", id->name, num);
849 dev_err(&client->dev, "failed to allocate device name\n");
854 di = devm_kzalloc(&client->dev, sizeof(*di), GFP_KERNEL);
856 dev_err(&client->dev, "failed to allocate device info data\n");
862 di->dev = &client->dev;
863 di->chip = id->driver_data;
865 di->bus.read = &bq27x00_read_i2c;
867 retval = bq27x00_powersupply_init(di);
871 i2c_set_clientdata(client, di);
878 mutex_lock(&battery_mutex);
879 idr_remove(&battery_id, num);
880 mutex_unlock(&battery_mutex);
885 static int bq27x00_battery_remove(struct i2c_client *client)
887 struct bq27x00_device_info *di = i2c_get_clientdata(client);
889 bq27x00_powersupply_unregister(di);
893 mutex_lock(&battery_mutex);
894 idr_remove(&battery_id, di->id);
895 mutex_unlock(&battery_mutex);
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 },
907 MODULE_DEVICE_TABLE(i2c, bq27x00_id);
909 static struct i2c_driver bq27x00_battery_driver = {
911 .name = "bq27x00-battery",
913 .probe = bq27x00_battery_probe,
914 .remove = bq27x00_battery_remove,
915 .id_table = bq27x00_id,
918 static inline int bq27x00_battery_i2c_init(void)
920 int ret = i2c_add_driver(&bq27x00_battery_driver);
922 printk(KERN_ERR "Unable to register BQ27x00 i2c driver\n");
927 static inline void bq27x00_battery_i2c_exit(void)
929 i2c_del_driver(&bq27x00_battery_driver);
934 static inline int bq27x00_battery_i2c_init(void) { return 0; }
935 static inline void bq27x00_battery_i2c_exit(void) {};
939 /* platform specific code */
940 #ifdef CONFIG_BATTERY_BQ27X00_PLATFORM
942 static int bq27000_read_platform(struct bq27x00_device_info *di, u8 reg,
945 struct device *dev = di->dev;
946 struct bq27000_platform_data *pdata = dev->platform_data;
947 unsigned int timeout = 3;
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);
960 lower = pdata->read(dev, reg);
964 upper = pdata->read(dev, reg + 1);
965 } while (temp != upper && --timeout);
970 return (upper << 8) | lower;
973 return pdata->read(dev, reg);
976 static int bq27000_battery_probe(struct platform_device *pdev)
978 struct bq27x00_device_info *di;
979 struct bq27000_platform_data *pdata = pdev->dev.platform_data;
982 dev_err(&pdev->dev, "no platform_data supplied\n");
987 dev_err(&pdev->dev, "no hdq read callback supplied\n");
991 di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
993 dev_err(&pdev->dev, "failed to allocate device info data\n");
997 platform_set_drvdata(pdev, di);
999 di->dev = &pdev->dev;
1002 di->bat.name = pdata->name ?: dev_name(&pdev->dev);
1003 di->bus.read = &bq27000_read_platform;
1005 return bq27x00_powersupply_init(di);
1008 static int bq27000_battery_remove(struct platform_device *pdev)
1010 struct bq27x00_device_info *di = platform_get_drvdata(pdev);
1012 bq27x00_powersupply_unregister(di);
1017 static struct platform_driver bq27000_battery_driver = {
1018 .probe = bq27000_battery_probe,
1019 .remove = bq27000_battery_remove,
1021 .name = "bq27000-battery",
1025 static inline int bq27x00_battery_platform_init(void)
1027 int ret = platform_driver_register(&bq27000_battery_driver);
1029 printk(KERN_ERR "Unable to register BQ27000 platform driver\n");
1034 static inline void bq27x00_battery_platform_exit(void)
1036 platform_driver_unregister(&bq27000_battery_driver);
1041 static inline int bq27x00_battery_platform_init(void) { return 0; }
1042 static inline void bq27x00_battery_platform_exit(void) {};
1050 static int __init bq27x00_battery_init(void)
1054 ret = bq27x00_battery_i2c_init();
1058 ret = bq27x00_battery_platform_init();
1060 bq27x00_battery_i2c_exit();
1064 module_init(bq27x00_battery_init);
1066 static void __exit bq27x00_battery_exit(void)
1068 bq27x00_battery_platform_exit();
1069 bq27x00_battery_i2c_exit();
1071 module_exit(bq27x00_battery_exit);
1073 MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
1074 MODULE_DESCRIPTION("BQ27x00 battery monitor driver");
1075 MODULE_LICENSE("GPL");