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
27 #include <linux/module.h>
28 #include <linux/param.h>
29 #include <linux/jiffies.h>
30 #include <linux/workqueue.h>
31 #include <linux/delay.h>
32 #include <linux/platform_device.h>
33 #include <linux/power_supply.h>
34 #include <linux/idr.h>
35 #include <linux/i2c.h>
36 #include <linux/slab.h>
37 #include <asm/unaligned.h>
39 #include <linux/power/bq27x00_battery.h>
41 #define DRIVER_VERSION "1.2.0"
43 #define BQ27x00_REG_TEMP 0x06
44 #define BQ27x00_REG_VOLT 0x08
45 #define BQ27x00_REG_AI 0x14
46 #define BQ27x00_REG_FLAGS 0x0A
47 #define BQ27x00_REG_TTE 0x16
48 #define BQ27x00_REG_TTF 0x18
49 #define BQ27x00_REG_TTECP 0x26
50 #define BQ27x00_REG_NAC 0x0C /* Nominal available capaciy */
51 #define BQ27x00_REG_LMD 0x12 /* Last measured discharge */
52 #define BQ27x00_REG_CYCT 0x2A /* Cycle count total */
53 #define BQ27x00_REG_AE 0x22 /* Available enery */
55 #define BQ27000_REG_RSOC 0x0B /* Relative State-of-Charge */
56 #define BQ27000_REG_ILMD 0x76 /* Initial last measured discharge */
57 #define BQ27000_FLAG_EDVF BIT(0) /* Final End-of-Discharge-Voltage flag */
58 #define BQ27000_FLAG_EDV1 BIT(1) /* First End-of-Discharge-Voltage flag */
59 #define BQ27000_FLAG_CI BIT(4) /* Capacity Inaccurate flag */
60 #define BQ27000_FLAG_FC BIT(5)
61 #define BQ27000_FLAG_CHGS BIT(7) /* Charge state flag */
63 #define BQ27500_REG_SOC 0x2C
64 #define BQ27500_REG_DCAP 0x3C /* Design capacity */
65 #define BQ27500_FLAG_DSG BIT(0) /* Discharging */
66 #define BQ27500_FLAG_SOCF BIT(1) /* State-of-Charge threshold final */
67 #define BQ27500_FLAG_SOC1 BIT(2) /* State-of-Charge threshold 1 */
68 #define BQ27500_FLAG_CHG BIT(8) /* Charging */
69 #define BQ27500_FLAG_FC BIT(9) /* Fully charged */
71 #define BQ27000_RS 20 /* Resistor sense */
73 struct bq27x00_device_info;
74 struct bq27x00_access_methods {
75 int (*read)(struct bq27x00_device_info *di, u8 reg, bool single);
78 enum bq27x00_chip { BQ27000, BQ27500 };
80 struct bq27x00_reg_cache {
83 int time_to_empty_avg;
92 struct bq27x00_device_info {
95 enum bq27x00_chip chip;
97 struct bq27x00_reg_cache cache;
98 int charge_design_full;
100 unsigned long last_update;
101 struct delayed_work work;
103 struct power_supply bat;
105 struct bq27x00_access_methods bus;
110 static enum power_supply_property bq27x00_battery_props[] = {
111 POWER_SUPPLY_PROP_STATUS,
112 POWER_SUPPLY_PROP_PRESENT,
113 POWER_SUPPLY_PROP_VOLTAGE_NOW,
114 POWER_SUPPLY_PROP_CURRENT_NOW,
115 POWER_SUPPLY_PROP_CAPACITY,
116 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
117 POWER_SUPPLY_PROP_TEMP,
118 POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
119 POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
120 POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
121 POWER_SUPPLY_PROP_TECHNOLOGY,
122 POWER_SUPPLY_PROP_CHARGE_FULL,
123 POWER_SUPPLY_PROP_CHARGE_NOW,
124 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
125 POWER_SUPPLY_PROP_CYCLE_COUNT,
126 POWER_SUPPLY_PROP_ENERGY_NOW,
129 static unsigned int poll_interval = 360;
130 module_param(poll_interval, uint, 0644);
131 MODULE_PARM_DESC(poll_interval, "battery poll interval in seconds - " \
132 "0 disables polling");
135 * Common code for BQ27x00 devices
138 static inline int bq27x00_read(struct bq27x00_device_info *di, u8 reg,
141 return di->bus.read(di, reg, single);
145 * Return the battery Relative State-of-Charge
146 * Or < 0 if something fails.
148 static int bq27x00_battery_read_rsoc(struct bq27x00_device_info *di)
152 if (di->chip == BQ27500)
153 rsoc = bq27x00_read(di, BQ27500_REG_SOC, false);
155 rsoc = bq27x00_read(di, BQ27000_REG_RSOC, true);
158 dev_dbg(di->dev, "error reading relative State-of-Charge\n");
164 * Return a battery charge value in µAh
165 * Or < 0 if something fails.
167 static int bq27x00_battery_read_charge(struct bq27x00_device_info *di, u8 reg)
171 charge = bq27x00_read(di, reg, false);
173 dev_dbg(di->dev, "error reading charge register %02x: %d\n",
178 if (di->chip == BQ27500)
181 charge = charge * 3570 / BQ27000_RS;
187 * Return the battery Nominal available capaciy in µAh
188 * Or < 0 if something fails.
190 static inline int bq27x00_battery_read_nac(struct bq27x00_device_info *di)
192 return bq27x00_battery_read_charge(di, BQ27x00_REG_NAC);
196 * Return the battery Last measured discharge in µAh
197 * Or < 0 if something fails.
199 static inline int bq27x00_battery_read_lmd(struct bq27x00_device_info *di)
201 return bq27x00_battery_read_charge(di, BQ27x00_REG_LMD);
205 * Return the battery Initial last measured discharge in µAh
206 * Or < 0 if something fails.
208 static int bq27x00_battery_read_ilmd(struct bq27x00_device_info *di)
212 if (di->chip == BQ27500)
213 ilmd = bq27x00_read(di, BQ27500_REG_DCAP, false);
215 ilmd = bq27x00_read(di, BQ27000_REG_ILMD, true);
218 dev_dbg(di->dev, "error reading initial last measured discharge\n");
222 if (di->chip == BQ27500)
225 ilmd = ilmd * 256 * 3570 / BQ27000_RS;
231 * Return the battery Available energy in µWh
232 * Or < 0 if something fails.
234 static int bq27x00_battery_read_energy(struct bq27x00_device_info *di)
238 ae = bq27x00_read(di, BQ27x00_REG_AE, false);
240 dev_dbg(di->dev, "error reading available energy\n");
244 if (di->chip == BQ27500)
247 ae = ae * 29200 / BQ27000_RS;
253 * Return the battery temperature in tenths of degree Celsius
254 * Or < 0 if something fails.
256 static int bq27x00_battery_read_temperature(struct bq27x00_device_info *di)
260 temp = bq27x00_read(di, BQ27x00_REG_TEMP, false);
262 dev_err(di->dev, "error reading temperature\n");
266 if (di->chip == BQ27500)
269 temp = ((temp * 5) - 5463) / 2;
275 * Return the battery Cycle count total
276 * Or < 0 if something fails.
278 static int bq27x00_battery_read_cyct(struct bq27x00_device_info *di)
282 cyct = bq27x00_read(di, BQ27x00_REG_CYCT, false);
284 dev_err(di->dev, "error reading cycle count total\n");
290 * Read a time register.
291 * Return < 0 if something fails.
293 static int bq27x00_battery_read_time(struct bq27x00_device_info *di, u8 reg)
297 tval = bq27x00_read(di, reg, false);
299 dev_dbg(di->dev, "error reading time register %02x: %d\n",
310 static void bq27x00_update(struct bq27x00_device_info *di)
312 struct bq27x00_reg_cache cache = {0, };
313 bool is_bq27500 = di->chip == BQ27500;
315 cache.flags = bq27x00_read(di, BQ27x00_REG_FLAGS, is_bq27500);
316 if (cache.flags >= 0) {
317 if (!is_bq27500 && (cache.flags & BQ27000_FLAG_CI)) {
318 dev_info(di->dev, "battery is not calibrated! ignoring capacity values\n");
319 cache.capacity = -ENODATA;
320 cache.energy = -ENODATA;
321 cache.time_to_empty = -ENODATA;
322 cache.time_to_empty_avg = -ENODATA;
323 cache.time_to_full = -ENODATA;
324 cache.charge_full = -ENODATA;
326 cache.capacity = bq27x00_battery_read_rsoc(di);
327 cache.energy = bq27x00_battery_read_energy(di);
328 cache.time_to_empty = bq27x00_battery_read_time(di, BQ27x00_REG_TTE);
329 cache.time_to_empty_avg = bq27x00_battery_read_time(di, BQ27x00_REG_TTECP);
330 cache.time_to_full = bq27x00_battery_read_time(di, BQ27x00_REG_TTF);
331 cache.charge_full = bq27x00_battery_read_lmd(di);
333 cache.temperature = bq27x00_battery_read_temperature(di);
334 cache.cycle_count = bq27x00_battery_read_cyct(di);
336 /* We only have to read charge design full once */
337 if (di->charge_design_full <= 0)
338 di->charge_design_full = bq27x00_battery_read_ilmd(di);
341 if (memcmp(&di->cache, &cache, sizeof(cache)) != 0) {
343 power_supply_changed(&di->bat);
346 di->last_update = jiffies;
349 static void bq27x00_battery_poll(struct work_struct *work)
351 struct bq27x00_device_info *di =
352 container_of(work, struct bq27x00_device_info, work.work);
356 if (poll_interval > 0) {
357 /* The timer does not have to be accurate. */
358 set_timer_slack(&di->work.timer, poll_interval * HZ / 4);
359 schedule_delayed_work(&di->work, poll_interval * HZ);
364 * Return the battery average current in µA
365 * Note that current can be negative signed as well
366 * Or 0 if something fails.
368 static int bq27x00_battery_current(struct bq27x00_device_info *di,
369 union power_supply_propval *val)
374 curr = bq27x00_read(di, BQ27x00_REG_AI, false);
376 dev_err(di->dev, "error reading current\n");
380 if (di->chip == BQ27500) {
381 /* bq27500 returns signed value */
382 val->intval = (int)((s16)curr) * 1000;
384 flags = bq27x00_read(di, BQ27x00_REG_FLAGS, false);
385 if (flags & BQ27000_FLAG_CHGS) {
386 dev_dbg(di->dev, "negative current!\n");
390 val->intval = curr * 3570 / BQ27000_RS;
396 static int bq27x00_battery_status(struct bq27x00_device_info *di,
397 union power_supply_propval *val)
401 if (di->chip == BQ27500) {
402 if (di->cache.flags & BQ27500_FLAG_FC)
403 status = POWER_SUPPLY_STATUS_FULL;
404 else if (di->cache.flags & BQ27500_FLAG_DSG)
405 status = POWER_SUPPLY_STATUS_DISCHARGING;
406 else if (di->cache.flags & BQ27500_FLAG_CHG)
407 status = POWER_SUPPLY_STATUS_CHARGING;
408 else if (power_supply_am_i_supplied(&di->bat))
409 status = POWER_SUPPLY_STATUS_NOT_CHARGING;
411 status = POWER_SUPPLY_STATUS_UNKNOWN;
413 if (di->cache.flags & BQ27000_FLAG_FC)
414 status = POWER_SUPPLY_STATUS_FULL;
415 else if (di->cache.flags & BQ27000_FLAG_CHGS)
416 status = POWER_SUPPLY_STATUS_CHARGING;
417 else if (power_supply_am_i_supplied(&di->bat))
418 status = POWER_SUPPLY_STATUS_NOT_CHARGING;
420 status = POWER_SUPPLY_STATUS_DISCHARGING;
423 val->intval = status;
428 static int bq27x00_battery_capacity_level(struct bq27x00_device_info *di,
429 union power_supply_propval *val)
433 if (di->chip == BQ27500) {
434 if (di->cache.flags & BQ27500_FLAG_FC)
435 level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
436 else if (di->cache.flags & BQ27500_FLAG_SOC1)
437 level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
438 else if (di->cache.flags & BQ27500_FLAG_SOCF)
439 level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
441 level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
443 if (di->cache.flags & BQ27000_FLAG_FC)
444 level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
445 else if (di->cache.flags & BQ27000_FLAG_EDV1)
446 level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
447 else if (di->cache.flags & BQ27000_FLAG_EDVF)
448 level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
450 level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
459 * Return the battery Voltage in milivolts
460 * Or < 0 if something fails.
462 static int bq27x00_battery_voltage(struct bq27x00_device_info *di,
463 union power_supply_propval *val)
467 volt = bq27x00_read(di, BQ27x00_REG_VOLT, false);
469 dev_err(di->dev, "error reading voltage\n");
473 val->intval = volt * 1000;
478 static int bq27x00_simple_value(int value,
479 union power_supply_propval *val)
489 #define to_bq27x00_device_info(x) container_of((x), \
490 struct bq27x00_device_info, bat);
492 static int bq27x00_battery_get_property(struct power_supply *psy,
493 enum power_supply_property psp,
494 union power_supply_propval *val)
497 struct bq27x00_device_info *di = to_bq27x00_device_info(psy);
499 mutex_lock(&di->lock);
500 if (time_is_before_jiffies(di->last_update + 5 * HZ)) {
501 cancel_delayed_work_sync(&di->work);
502 bq27x00_battery_poll(&di->work.work);
504 mutex_unlock(&di->lock);
506 if (psp != POWER_SUPPLY_PROP_PRESENT && di->cache.flags < 0)
510 case POWER_SUPPLY_PROP_STATUS:
511 ret = bq27x00_battery_status(di, val);
513 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
514 ret = bq27x00_battery_voltage(di, val);
516 case POWER_SUPPLY_PROP_PRESENT:
517 val->intval = di->cache.flags < 0 ? 0 : 1;
519 case POWER_SUPPLY_PROP_CURRENT_NOW:
520 ret = bq27x00_battery_current(di, val);
522 case POWER_SUPPLY_PROP_CAPACITY:
523 ret = bq27x00_simple_value(di->cache.capacity, val);
525 case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
526 ret = bq27x00_battery_capacity_level(di, val);
528 case POWER_SUPPLY_PROP_TEMP:
529 ret = bq27x00_simple_value(di->cache.temperature, val);
531 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
532 ret = bq27x00_simple_value(di->cache.time_to_empty, val);
534 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
535 ret = bq27x00_simple_value(di->cache.time_to_empty_avg, val);
537 case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
538 ret = bq27x00_simple_value(di->cache.time_to_full, val);
540 case POWER_SUPPLY_PROP_TECHNOLOGY:
541 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
543 case POWER_SUPPLY_PROP_CHARGE_NOW:
544 ret = bq27x00_simple_value(bq27x00_battery_read_nac(di), val);
546 case POWER_SUPPLY_PROP_CHARGE_FULL:
547 ret = bq27x00_simple_value(di->cache.charge_full, val);
549 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
550 ret = bq27x00_simple_value(di->charge_design_full, val);
552 case POWER_SUPPLY_PROP_CYCLE_COUNT:
553 ret = bq27x00_simple_value(di->cache.cycle_count, val);
555 case POWER_SUPPLY_PROP_ENERGY_NOW:
556 ret = bq27x00_simple_value(di->cache.energy, val);
565 static void bq27x00_external_power_changed(struct power_supply *psy)
567 struct bq27x00_device_info *di = to_bq27x00_device_info(psy);
569 cancel_delayed_work_sync(&di->work);
570 schedule_delayed_work(&di->work, 0);
573 static int bq27x00_powersupply_init(struct bq27x00_device_info *di)
577 di->bat.type = POWER_SUPPLY_TYPE_BATTERY;
578 di->bat.properties = bq27x00_battery_props;
579 di->bat.num_properties = ARRAY_SIZE(bq27x00_battery_props);
580 di->bat.get_property = bq27x00_battery_get_property;
581 di->bat.external_power_changed = bq27x00_external_power_changed;
583 INIT_DELAYED_WORK(&di->work, bq27x00_battery_poll);
584 mutex_init(&di->lock);
586 ret = power_supply_register(di->dev, &di->bat);
588 dev_err(di->dev, "failed to register battery: %d\n", ret);
592 dev_info(di->dev, "support ver. %s enabled\n", DRIVER_VERSION);
599 static void bq27x00_powersupply_unregister(struct bq27x00_device_info *di)
602 * power_supply_unregister call bq27x00_battery_get_property which
603 * call bq27x00_battery_poll.
604 * Make sure that bq27x00_battery_poll will not call
605 * schedule_delayed_work again after unregister (which cause OOPS).
609 cancel_delayed_work_sync(&di->work);
611 power_supply_unregister(&di->bat);
613 mutex_destroy(&di->lock);
617 /* i2c specific code */
618 #ifdef CONFIG_BATTERY_BQ27X00_I2C
620 /* If the system has several batteries we need a different name for each
623 static DEFINE_IDR(battery_id);
624 static DEFINE_MUTEX(battery_mutex);
626 static int bq27x00_read_i2c(struct bq27x00_device_info *di, u8 reg, bool single)
628 struct i2c_client *client = to_i2c_client(di->dev);
629 struct i2c_msg msg[2];
630 unsigned char data[2];
633 if (!client->adapter)
636 msg[0].addr = client->addr;
639 msg[0].len = sizeof(reg);
640 msg[1].addr = client->addr;
641 msg[1].flags = I2C_M_RD;
648 ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
653 ret = get_unaligned_le16(data);
660 static int bq27x00_battery_probe(struct i2c_client *client,
661 const struct i2c_device_id *id)
664 struct bq27x00_device_info *di;
668 /* Get new ID for the new battery device */
669 retval = idr_pre_get(&battery_id, GFP_KERNEL);
672 mutex_lock(&battery_mutex);
673 retval = idr_get_new(&battery_id, client, &num);
674 mutex_unlock(&battery_mutex);
678 name = kasprintf(GFP_KERNEL, "%s-%d", id->name, num);
680 dev_err(&client->dev, "failed to allocate device name\n");
685 di = kzalloc(sizeof(*di), GFP_KERNEL);
687 dev_err(&client->dev, "failed to allocate device info data\n");
693 di->dev = &client->dev;
694 di->chip = id->driver_data;
696 di->bus.read = &bq27x00_read_i2c;
698 if (bq27x00_powersupply_init(di))
701 i2c_set_clientdata(client, di);
710 mutex_lock(&battery_mutex);
711 idr_remove(&battery_id, num);
712 mutex_unlock(&battery_mutex);
717 static int bq27x00_battery_remove(struct i2c_client *client)
719 struct bq27x00_device_info *di = i2c_get_clientdata(client);
721 bq27x00_powersupply_unregister(di);
725 mutex_lock(&battery_mutex);
726 idr_remove(&battery_id, di->id);
727 mutex_unlock(&battery_mutex);
734 static const struct i2c_device_id bq27x00_id[] = {
735 { "bq27200", BQ27000 }, /* bq27200 is same as bq27000, but with i2c */
736 { "bq27500", BQ27500 },
739 MODULE_DEVICE_TABLE(i2c, bq27x00_id);
741 static struct i2c_driver bq27x00_battery_driver = {
743 .name = "bq27x00-battery",
745 .probe = bq27x00_battery_probe,
746 .remove = bq27x00_battery_remove,
747 .id_table = bq27x00_id,
750 static inline int bq27x00_battery_i2c_init(void)
752 int ret = i2c_add_driver(&bq27x00_battery_driver);
754 printk(KERN_ERR "Unable to register BQ27x00 i2c driver\n");
759 static inline void bq27x00_battery_i2c_exit(void)
761 i2c_del_driver(&bq27x00_battery_driver);
766 static inline int bq27x00_battery_i2c_init(void) { return 0; }
767 static inline void bq27x00_battery_i2c_exit(void) {};
771 /* platform specific code */
772 #ifdef CONFIG_BATTERY_BQ27X00_PLATFORM
774 static int bq27000_read_platform(struct bq27x00_device_info *di, u8 reg,
777 struct device *dev = di->dev;
778 struct bq27000_platform_data *pdata = dev->platform_data;
779 unsigned int timeout = 3;
784 /* Make sure the value has not changed in between reading the
785 * lower and the upper part */
786 upper = pdata->read(dev, reg + 1);
792 lower = pdata->read(dev, reg);
796 upper = pdata->read(dev, reg + 1);
797 } while (temp != upper && --timeout);
802 return (upper << 8) | lower;
805 return pdata->read(dev, reg);
808 static int __devinit bq27000_battery_probe(struct platform_device *pdev)
810 struct bq27x00_device_info *di;
811 struct bq27000_platform_data *pdata = pdev->dev.platform_data;
815 dev_err(&pdev->dev, "no platform_data supplied\n");
820 dev_err(&pdev->dev, "no hdq read callback supplied\n");
824 di = kzalloc(sizeof(*di), GFP_KERNEL);
826 dev_err(&pdev->dev, "failed to allocate device info data\n");
830 platform_set_drvdata(pdev, di);
832 di->dev = &pdev->dev;
835 di->bat.name = pdata->name ?: dev_name(&pdev->dev);
836 di->bus.read = &bq27000_read_platform;
838 ret = bq27x00_powersupply_init(di);
845 platform_set_drvdata(pdev, NULL);
851 static int __devexit bq27000_battery_remove(struct platform_device *pdev)
853 struct bq27x00_device_info *di = platform_get_drvdata(pdev);
855 bq27x00_powersupply_unregister(di);
857 platform_set_drvdata(pdev, NULL);
863 static struct platform_driver bq27000_battery_driver = {
864 .probe = bq27000_battery_probe,
865 .remove = __devexit_p(bq27000_battery_remove),
867 .name = "bq27000-battery",
868 .owner = THIS_MODULE,
872 static inline int bq27x00_battery_platform_init(void)
874 int ret = platform_driver_register(&bq27000_battery_driver);
876 printk(KERN_ERR "Unable to register BQ27000 platform driver\n");
881 static inline void bq27x00_battery_platform_exit(void)
883 platform_driver_unregister(&bq27000_battery_driver);
888 static inline int bq27x00_battery_platform_init(void) { return 0; }
889 static inline void bq27x00_battery_platform_exit(void) {};
897 static int __init bq27x00_battery_init(void)
901 ret = bq27x00_battery_i2c_init();
905 ret = bq27x00_battery_platform_init();
907 bq27x00_battery_i2c_exit();
911 module_init(bq27x00_battery_init);
913 static void __exit bq27x00_battery_exit(void)
915 bq27x00_battery_platform_exit();
916 bq27x00_battery_i2c_exit();
918 module_exit(bq27x00_battery_exit);
920 MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
921 MODULE_DESCRIPTION("BQ27x00 battery monitor driver");
922 MODULE_LICENSE("GPL");