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Rodolfo Giomettib996ad02008-08-20 16:52:58 -07001/*
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>
Lars-Peter Clausen7fb7ba52010-05-24 19:55:27 +02006 * Copyright (C) 2010-2011 Lars-Peter Clausen <lars@metafoo.de>
Pali Rohár73c244a2011-04-30 23:59:35 +02007 * Copyright (C) 2011 Pali Rohár <pali.rohar@gmail.com>
Rodolfo Giomettib996ad02008-08-20 16:52:58 -07008 *
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 */
Pali Rohár631c17e2011-02-01 00:08:02 +010020
21/*
22 * Datasheets:
23 * http://focus.ti.com/docs/prod/folders/print/bq27000.html
24 * http://focus.ti.com/docs/prod/folders/print/bq27500.html
25 */
26
Rodolfo Giomettib996ad02008-08-20 16:52:58 -070027#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>
Rodolfo Giomettib996ad02008-08-20 16:52:58 -070035#include <linux/i2c.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090036#include <linux/slab.h>
Harvey Harrison8aef7e82008-09-22 14:53:50 -070037#include <asm/unaligned.h>
Rodolfo Giomettib996ad02008-08-20 16:52:58 -070038
Lars-Peter Clausen7fb7ba52010-05-24 19:55:27 +020039#include <linux/power/bq27x00_battery.h>
40
Pali Rohár631c17e2011-02-01 00:08:02 +010041#define DRIVER_VERSION "1.2.0"
Rodolfo Giomettib996ad02008-08-20 16:52:58 -070042
43#define BQ27x00_REG_TEMP 0x06
44#define BQ27x00_REG_VOLT 0x08
Rodolfo Giomettib996ad02008-08-20 16:52:58 -070045#define BQ27x00_REG_AI 0x14
46#define BQ27x00_REG_FLAGS 0x0A
Grazvydas Ignotas4e924a82010-02-27 17:06:09 +020047#define BQ27x00_REG_TTE 0x16
48#define BQ27x00_REG_TTF 0x18
49#define BQ27x00_REG_TTECP 0x26
Thomas Weber202e0112012-02-16 08:58:15 +010050#define BQ27x00_REG_NAC 0x0C /* Nominal available capacity */
Pali Rohár631c17e2011-02-01 00:08:02 +010051#define BQ27x00_REG_LMD 0x12 /* Last measured discharge */
52#define BQ27x00_REG_CYCT 0x2A /* Cycle count total */
Thomas Weber202e0112012-02-16 08:58:15 +010053#define BQ27x00_REG_AE 0x22 /* Available energy */
Rodolfo Giomettib996ad02008-08-20 16:52:58 -070054
Grazvydas Ignotase20908d2010-02-12 23:57:23 +020055#define BQ27000_REG_RSOC 0x0B /* Relative State-of-Charge */
Pali Rohár631c17e2011-02-01 00:08:02 +010056#define BQ27000_REG_ILMD 0x76 /* Initial last measured discharge */
Pali Rohárd66bab32011-11-01 01:43:04 +010057#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 */
Pali Rohár4b226c22011-11-01 01:43:05 +010059#define BQ27000_FLAG_CI BIT(4) /* Capacity Inaccurate flag */
Lars-Peter Clausenc1b9ab62010-09-18 17:31:16 +020060#define BQ27000_FLAG_FC BIT(5)
Pali Rohárd66bab32011-11-01 01:43:04 +010061#define BQ27000_FLAG_CHGS BIT(7) /* Charge state flag */
Grazvydas Ignotase20908d2010-02-12 23:57:23 +020062
Pali Rohárbf7d4142011-02-01 00:23:13 +010063#define BQ27500_REG_SOC 0x2C
Pali Rohár631c17e2011-02-01 00:08:02 +010064#define BQ27500_REG_DCAP 0x3C /* Design capacity */
Anton Vorontsovb7aaacf2012-02-01 21:20:15 +040065#define BQ27500_FLAG_DSC BIT(0)
Pali Rohárd66bab32011-11-01 01:43:04 +010066#define BQ27500_FLAG_SOCF BIT(1) /* State-of-Charge threshold final */
67#define BQ27500_FLAG_SOC1 BIT(2) /* State-of-Charge threshold 1 */
Anton Vorontsovb7aaacf2012-02-01 21:20:15 +040068#define BQ27500_FLAG_FC BIT(9)
Grazvydas Ignotase20908d2010-02-12 23:57:23 +020069
Pali Rohára2e51182010-05-24 20:52:13 +020070#define BQ27000_RS 20 /* Resistor sense */
71
Rodolfo Giomettib996ad02008-08-20 16:52:58 -070072struct bq27x00_device_info;
73struct bq27x00_access_methods {
Lars-Peter Clausen297a5332011-01-07 20:12:47 +010074 int (*read)(struct bq27x00_device_info *di, u8 reg, bool single);
Rodolfo Giomettib996ad02008-08-20 16:52:58 -070075};
76
Grazvydas Ignotase20908d2010-02-12 23:57:23 +020077enum bq27x00_chip { BQ27000, BQ27500 };
78
Lars-Peter Clausen297a5332011-01-07 20:12:47 +010079struct bq27x00_reg_cache {
80 int temperature;
81 int time_to_empty;
82 int time_to_empty_avg;
83 int time_to_full;
Pali Rohár631c17e2011-02-01 00:08:02 +010084 int charge_full;
Pali Rohár73c244a2011-04-30 23:59:35 +020085 int cycle_count;
Lars-Peter Clausen297a5332011-01-07 20:12:47 +010086 int capacity;
Pali Rohára8f6bd22011-11-01 01:43:06 +010087 int energy;
Lars-Peter Clausen297a5332011-01-07 20:12:47 +010088 int flags;
Lars-Peter Clausen297a5332011-01-07 20:12:47 +010089};
90
Rodolfo Giomettib996ad02008-08-20 16:52:58 -070091struct bq27x00_device_info {
92 struct device *dev;
93 int id;
Grazvydas Ignotase20908d2010-02-12 23:57:23 +020094 enum bq27x00_chip chip;
Rodolfo Giomettib996ad02008-08-20 16:52:58 -070095
Lars-Peter Clausen297a5332011-01-07 20:12:47 +010096 struct bq27x00_reg_cache cache;
Pali Rohár631c17e2011-02-01 00:08:02 +010097 int charge_design_full;
98
Lars-Peter Clausen297a5332011-01-07 20:12:47 +010099 unsigned long last_update;
Lars-Peter Clausen740b7552011-01-07 20:14:53 +0100100 struct delayed_work work;
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100101
Lars-Peter Clausena40402e2010-05-24 19:37:58 +0200102 struct power_supply bat;
103
104 struct bq27x00_access_methods bus;
Lars-Peter Clausen740b7552011-01-07 20:14:53 +0100105
106 struct mutex lock;
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700107};
108
109static enum power_supply_property bq27x00_battery_props[] = {
Grazvydas Ignotas4e924a82010-02-27 17:06:09 +0200110 POWER_SUPPLY_PROP_STATUS,
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700111 POWER_SUPPLY_PROP_PRESENT,
112 POWER_SUPPLY_PROP_VOLTAGE_NOW,
113 POWER_SUPPLY_PROP_CURRENT_NOW,
114 POWER_SUPPLY_PROP_CAPACITY,
Pali Rohárd66bab32011-11-01 01:43:04 +0100115 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700116 POWER_SUPPLY_PROP_TEMP,
Grazvydas Ignotas4e924a82010-02-27 17:06:09 +0200117 POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
118 POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
119 POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
Lars-Peter Clausen5661f332010-05-24 20:36:52 +0200120 POWER_SUPPLY_PROP_TECHNOLOGY,
Pali Rohár631c17e2011-02-01 00:08:02 +0100121 POWER_SUPPLY_PROP_CHARGE_FULL,
122 POWER_SUPPLY_PROP_CHARGE_NOW,
123 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
Pali Rohár73c244a2011-04-30 23:59:35 +0200124 POWER_SUPPLY_PROP_CYCLE_COUNT,
Pali Rohár631c17e2011-02-01 00:08:02 +0100125 POWER_SUPPLY_PROP_ENERGY_NOW,
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700126};
127
Lars-Peter Clausen740b7552011-01-07 20:14:53 +0100128static unsigned int poll_interval = 360;
129module_param(poll_interval, uint, 0644);
130MODULE_PARM_DESC(poll_interval, "battery poll interval in seconds - " \
131 "0 disables polling");
132
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700133/*
134 * Common code for BQ27x00 devices
135 */
136
Lars-Peter Clausena40402e2010-05-24 19:37:58 +0200137static inline int bq27x00_read(struct bq27x00_device_info *di, u8 reg,
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100138 bool single)
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700139{
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100140 return di->bus.read(di, reg, single);
141}
142
143/*
144 * Return the battery Relative State-of-Charge
145 * Or < 0 if something fails.
146 */
147static int bq27x00_battery_read_rsoc(struct bq27x00_device_info *di)
148{
149 int rsoc;
150
151 if (di->chip == BQ27500)
152 rsoc = bq27x00_read(di, BQ27500_REG_SOC, false);
153 else
154 rsoc = bq27x00_read(di, BQ27000_REG_RSOC, true);
155
156 if (rsoc < 0)
Pali Rohárc6cd4f22011-11-01 01:43:09 +0100157 dev_dbg(di->dev, "error reading relative State-of-Charge\n");
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100158
159 return rsoc;
160}
161
162/*
Pali Rohár631c17e2011-02-01 00:08:02 +0100163 * Return a battery charge value in µAh
164 * Or < 0 if something fails.
165 */
166static int bq27x00_battery_read_charge(struct bq27x00_device_info *di, u8 reg)
167{
168 int charge;
169
170 charge = bq27x00_read(di, reg, false);
171 if (charge < 0) {
Pali Rohárc6cd4f22011-11-01 01:43:09 +0100172 dev_dbg(di->dev, "error reading charge register %02x: %d\n",
173 reg, charge);
Pali Rohár631c17e2011-02-01 00:08:02 +0100174 return charge;
175 }
176
177 if (di->chip == BQ27500)
178 charge *= 1000;
179 else
180 charge = charge * 3570 / BQ27000_RS;
181
182 return charge;
183}
184
185/*
186 * Return the battery Nominal available capaciy in µAh
187 * Or < 0 if something fails.
188 */
189static inline int bq27x00_battery_read_nac(struct bq27x00_device_info *di)
190{
191 return bq27x00_battery_read_charge(di, BQ27x00_REG_NAC);
192}
193
194/*
195 * Return the battery Last measured discharge in µAh
196 * Or < 0 if something fails.
197 */
198static inline int bq27x00_battery_read_lmd(struct bq27x00_device_info *di)
199{
200 return bq27x00_battery_read_charge(di, BQ27x00_REG_LMD);
201}
202
203/*
204 * Return the battery Initial last measured discharge in µAh
205 * Or < 0 if something fails.
206 */
207static int bq27x00_battery_read_ilmd(struct bq27x00_device_info *di)
208{
209 int ilmd;
210
211 if (di->chip == BQ27500)
212 ilmd = bq27x00_read(di, BQ27500_REG_DCAP, false);
213 else
214 ilmd = bq27x00_read(di, BQ27000_REG_ILMD, true);
215
216 if (ilmd < 0) {
Pali Rohárc6cd4f22011-11-01 01:43:09 +0100217 dev_dbg(di->dev, "error reading initial last measured discharge\n");
Pali Rohár631c17e2011-02-01 00:08:02 +0100218 return ilmd;
219 }
220
221 if (di->chip == BQ27500)
222 ilmd *= 1000;
223 else
224 ilmd = ilmd * 256 * 3570 / BQ27000_RS;
225
226 return ilmd;
227}
228
229/*
Pali Rohára8f6bd22011-11-01 01:43:06 +0100230 * Return the battery Available energy in µWh
231 * Or < 0 if something fails.
232 */
233static int bq27x00_battery_read_energy(struct bq27x00_device_info *di)
234{
235 int ae;
236
237 ae = bq27x00_read(di, BQ27x00_REG_AE, false);
238 if (ae < 0) {
Pali Rohárc6cd4f22011-11-01 01:43:09 +0100239 dev_dbg(di->dev, "error reading available energy\n");
Pali Rohára8f6bd22011-11-01 01:43:06 +0100240 return ae;
241 }
242
243 if (di->chip == BQ27500)
244 ae *= 1000;
245 else
246 ae = ae * 29200 / BQ27000_RS;
247
248 return ae;
249}
250
251/*
Pali Rohárd149e982011-11-01 01:43:07 +0100252 * Return the battery temperature in tenths of degree Celsius
253 * Or < 0 if something fails.
254 */
255static int bq27x00_battery_read_temperature(struct bq27x00_device_info *di)
256{
257 int temp;
258
259 temp = bq27x00_read(di, BQ27x00_REG_TEMP, false);
260 if (temp < 0) {
261 dev_err(di->dev, "error reading temperature\n");
262 return temp;
263 }
264
265 if (di->chip == BQ27500)
266 temp -= 2731;
267 else
268 temp = ((temp * 5) - 5463) / 2;
269
270 return temp;
271}
272
273/*
Pali Rohár631c17e2011-02-01 00:08:02 +0100274 * Return the battery Cycle count total
275 * Or < 0 if something fails.
276 */
277static int bq27x00_battery_read_cyct(struct bq27x00_device_info *di)
278{
279 int cyct;
280
281 cyct = bq27x00_read(di, BQ27x00_REG_CYCT, false);
282 if (cyct < 0)
283 dev_err(di->dev, "error reading cycle count total\n");
284
285 return cyct;
286}
287
288/*
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100289 * Read a time register.
290 * Return < 0 if something fails.
291 */
292static int bq27x00_battery_read_time(struct bq27x00_device_info *di, u8 reg)
293{
294 int tval;
295
296 tval = bq27x00_read(di, reg, false);
297 if (tval < 0) {
Pali Rohárc6cd4f22011-11-01 01:43:09 +0100298 dev_dbg(di->dev, "error reading time register %02x: %d\n",
299 reg, tval);
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100300 return tval;
301 }
302
303 if (tval == 65535)
304 return -ENODATA;
305
306 return tval * 60;
307}
308
309static void bq27x00_update(struct bq27x00_device_info *di)
310{
311 struct bq27x00_reg_cache cache = {0, };
312 bool is_bq27500 = di->chip == BQ27500;
313
Grazvydas Ignotas4d403652012-01-14 22:50:49 +0200314 cache.flags = bq27x00_read(di, BQ27x00_REG_FLAGS, !is_bq27500);
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100315 if (cache.flags >= 0) {
Pali Rohár4b226c22011-11-01 01:43:05 +0100316 if (!is_bq27500 && (cache.flags & BQ27000_FLAG_CI)) {
Pali Rohárc6cd4f22011-11-01 01:43:09 +0100317 dev_info(di->dev, "battery is not calibrated! ignoring capacity values\n");
Pali Rohár4b226c22011-11-01 01:43:05 +0100318 cache.capacity = -ENODATA;
Pali Rohára8f6bd22011-11-01 01:43:06 +0100319 cache.energy = -ENODATA;
Pali Rohár4b226c22011-11-01 01:43:05 +0100320 cache.time_to_empty = -ENODATA;
321 cache.time_to_empty_avg = -ENODATA;
322 cache.time_to_full = -ENODATA;
323 cache.charge_full = -ENODATA;
324 } else {
325 cache.capacity = bq27x00_battery_read_rsoc(di);
Pali Rohára8f6bd22011-11-01 01:43:06 +0100326 cache.energy = bq27x00_battery_read_energy(di);
Pali Rohár4b226c22011-11-01 01:43:05 +0100327 cache.time_to_empty = bq27x00_battery_read_time(di, BQ27x00_REG_TTE);
328 cache.time_to_empty_avg = bq27x00_battery_read_time(di, BQ27x00_REG_TTECP);
329 cache.time_to_full = bq27x00_battery_read_time(di, BQ27x00_REG_TTF);
330 cache.charge_full = bq27x00_battery_read_lmd(di);
331 }
Pali Rohárd149e982011-11-01 01:43:07 +0100332 cache.temperature = bq27x00_battery_read_temperature(di);
Pali Rohár73c244a2011-04-30 23:59:35 +0200333 cache.cycle_count = bq27x00_battery_read_cyct(di);
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100334
Pali Rohár631c17e2011-02-01 00:08:02 +0100335 /* We only have to read charge design full once */
336 if (di->charge_design_full <= 0)
337 di->charge_design_full = bq27x00_battery_read_ilmd(di);
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100338 }
339
Pali Rohárb68f6212011-11-01 01:43:03 +0100340 if (memcmp(&di->cache, &cache, sizeof(cache)) != 0) {
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100341 di->cache = cache;
342 power_supply_changed(&di->bat);
343 }
344
345 di->last_update = jiffies;
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700346}
347
Lars-Peter Clausen740b7552011-01-07 20:14:53 +0100348static void bq27x00_battery_poll(struct work_struct *work)
349{
350 struct bq27x00_device_info *di =
351 container_of(work, struct bq27x00_device_info, work.work);
352
353 bq27x00_update(di);
354
355 if (poll_interval > 0) {
356 /* The timer does not have to be accurate. */
357 set_timer_slack(&di->work.timer, poll_interval * HZ / 4);
358 schedule_delayed_work(&di->work, poll_interval * HZ);
359 }
360}
361
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700362/*
Pali Rohárbf7d4142011-02-01 00:23:13 +0100363 * Return the battery average current in µA
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700364 * Note that current can be negative signed as well
365 * Or 0 if something fails.
366 */
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100367static int bq27x00_battery_current(struct bq27x00_device_info *di,
368 union power_supply_propval *val)
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700369{
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100370 int curr;
Pali Rohárb68f6212011-11-01 01:43:03 +0100371 int flags;
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700372
Pali Rohárb68f6212011-11-01 01:43:03 +0100373 curr = bq27x00_read(di, BQ27x00_REG_AI, false);
Pali Rohárc6cd4f22011-11-01 01:43:09 +0100374 if (curr < 0) {
375 dev_err(di->dev, "error reading current\n");
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100376 return curr;
Pali Rohárc6cd4f22011-11-01 01:43:09 +0100377 }
Grazvydas Ignotase20908d2010-02-12 23:57:23 +0200378
379 if (di->chip == BQ27500) {
380 /* bq27500 returns signed value */
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100381 val->intval = (int)((s16)curr) * 1000;
Grazvydas Ignotase20908d2010-02-12 23:57:23 +0200382 } else {
Pali Rohárb68f6212011-11-01 01:43:03 +0100383 flags = bq27x00_read(di, BQ27x00_REG_FLAGS, false);
384 if (flags & BQ27000_FLAG_CHGS) {
Grazvydas Ignotase20908d2010-02-12 23:57:23 +0200385 dev_dbg(di->dev, "negative current!\n");
Grazvydas Ignotasafbc74fd2010-02-27 17:06:44 +0200386 curr = -curr;
Grazvydas Ignotase20908d2010-02-12 23:57:23 +0200387 }
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100388
389 val->intval = curr * 3570 / BQ27000_RS;
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700390 }
Grazvydas Ignotase20908d2010-02-12 23:57:23 +0200391
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100392 return 0;
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700393}
394
Grazvydas Ignotas4e924a82010-02-27 17:06:09 +0200395static int bq27x00_battery_status(struct bq27x00_device_info *di,
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100396 union power_supply_propval *val)
Grazvydas Ignotas4e924a82010-02-27 17:06:09 +0200397{
Grazvydas Ignotas4e924a82010-02-27 17:06:09 +0200398 int status;
Grazvydas Ignotas4e924a82010-02-27 17:06:09 +0200399
400 if (di->chip == BQ27500) {
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100401 if (di->cache.flags & BQ27500_FLAG_FC)
Grazvydas Ignotas4e924a82010-02-27 17:06:09 +0200402 status = POWER_SUPPLY_STATUS_FULL;
Anton Vorontsovb7aaacf2012-02-01 21:20:15 +0400403 else if (di->cache.flags & BQ27500_FLAG_DSC)
Grazvydas Ignotas4e924a82010-02-27 17:06:09 +0200404 status = POWER_SUPPLY_STATUS_DISCHARGING;
Pali Rohár270968c2011-11-01 01:43:08 +0100405 else
Anton Vorontsovb7aaacf2012-02-01 21:20:15 +0400406 status = POWER_SUPPLY_STATUS_CHARGING;
Grazvydas Ignotas4e924a82010-02-27 17:06:09 +0200407 } else {
Lars-Peter Clausenc1b9ab62010-09-18 17:31:16 +0200408 if (di->cache.flags & BQ27000_FLAG_FC)
409 status = POWER_SUPPLY_STATUS_FULL;
410 else if (di->cache.flags & BQ27000_FLAG_CHGS)
Grazvydas Ignotas4e924a82010-02-27 17:06:09 +0200411 status = POWER_SUPPLY_STATUS_CHARGING;
Lars-Peter Clausenc1b9ab62010-09-18 17:31:16 +0200412 else if (power_supply_am_i_supplied(&di->bat))
413 status = POWER_SUPPLY_STATUS_NOT_CHARGING;
Grazvydas Ignotas4e924a82010-02-27 17:06:09 +0200414 else
415 status = POWER_SUPPLY_STATUS_DISCHARGING;
416 }
417
418 val->intval = status;
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100419
Grazvydas Ignotas4e924a82010-02-27 17:06:09 +0200420 return 0;
421}
422
Pali Rohárd66bab32011-11-01 01:43:04 +0100423static int bq27x00_battery_capacity_level(struct bq27x00_device_info *di,
424 union power_supply_propval *val)
425{
426 int level;
427
428 if (di->chip == BQ27500) {
429 if (di->cache.flags & BQ27500_FLAG_FC)
430 level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
431 else if (di->cache.flags & BQ27500_FLAG_SOC1)
432 level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
433 else if (di->cache.flags & BQ27500_FLAG_SOCF)
434 level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
435 else
436 level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
437 } else {
438 if (di->cache.flags & BQ27000_FLAG_FC)
439 level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
440 else if (di->cache.flags & BQ27000_FLAG_EDV1)
441 level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
442 else if (di->cache.flags & BQ27000_FLAG_EDVF)
443 level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
444 else
445 level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
446 }
447
448 val->intval = level;
449
450 return 0;
451}
452
Grazvydas Ignotas4e924a82010-02-27 17:06:09 +0200453/*
Thomas Weber91fe4d52012-02-17 17:46:21 +0100454 * Return the battery Voltage in millivolts
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100455 * Or < 0 if something fails.
Grazvydas Ignotas4e924a82010-02-27 17:06:09 +0200456 */
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100457static int bq27x00_battery_voltage(struct bq27x00_device_info *di,
458 union power_supply_propval *val)
Grazvydas Ignotas4e924a82010-02-27 17:06:09 +0200459{
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100460 int volt;
Grazvydas Ignotas4e924a82010-02-27 17:06:09 +0200461
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100462 volt = bq27x00_read(di, BQ27x00_REG_VOLT, false);
Pali Rohárc6cd4f22011-11-01 01:43:09 +0100463 if (volt < 0) {
464 dev_err(di->dev, "error reading voltage\n");
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100465 return volt;
Pali Rohárc6cd4f22011-11-01 01:43:09 +0100466 }
Grazvydas Ignotas4e924a82010-02-27 17:06:09 +0200467
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100468 val->intval = volt * 1000;
Grazvydas Ignotas4e924a82010-02-27 17:06:09 +0200469
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100470 return 0;
471}
472
473static int bq27x00_simple_value(int value,
474 union power_supply_propval *val)
475{
476 if (value < 0)
477 return value;
478
479 val->intval = value;
480
Grazvydas Ignotas4e924a82010-02-27 17:06:09 +0200481 return 0;
482}
483
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700484#define to_bq27x00_device_info(x) container_of((x), \
485 struct bq27x00_device_info, bat);
486
487static int bq27x00_battery_get_property(struct power_supply *psy,
488 enum power_supply_property psp,
489 union power_supply_propval *val)
490{
Grazvydas Ignotas4e924a82010-02-27 17:06:09 +0200491 int ret = 0;
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700492 struct bq27x00_device_info *di = to_bq27x00_device_info(psy);
Lars-Peter Clausen3413b4e2010-05-24 21:57:33 +0200493
Lars-Peter Clausen740b7552011-01-07 20:14:53 +0100494 mutex_lock(&di->lock);
495 if (time_is_before_jiffies(di->last_update + 5 * HZ)) {
496 cancel_delayed_work_sync(&di->work);
497 bq27x00_battery_poll(&di->work.work);
498 }
499 mutex_unlock(&di->lock);
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100500
501 if (psp != POWER_SUPPLY_PROP_PRESENT && di->cache.flags < 0)
Lars-Peter Clausen3413b4e2010-05-24 21:57:33 +0200502 return -ENODEV;
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700503
504 switch (psp) {
Grazvydas Ignotas4e924a82010-02-27 17:06:09 +0200505 case POWER_SUPPLY_PROP_STATUS:
506 ret = bq27x00_battery_status(di, val);
507 break;
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700508 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100509 ret = bq27x00_battery_voltage(di, val);
Lars-Peter Clausen3413b4e2010-05-24 21:57:33 +0200510 break;
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700511 case POWER_SUPPLY_PROP_PRESENT:
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100512 val->intval = di->cache.flags < 0 ? 0 : 1;
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700513 break;
514 case POWER_SUPPLY_PROP_CURRENT_NOW:
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100515 ret = bq27x00_battery_current(di, val);
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700516 break;
517 case POWER_SUPPLY_PROP_CAPACITY:
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100518 ret = bq27x00_simple_value(di->cache.capacity, val);
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700519 break;
Pali Rohárd66bab32011-11-01 01:43:04 +0100520 case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
521 ret = bq27x00_battery_capacity_level(di, val);
522 break;
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700523 case POWER_SUPPLY_PROP_TEMP:
Pali Rohárd149e982011-11-01 01:43:07 +0100524 ret = bq27x00_simple_value(di->cache.temperature, val);
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700525 break;
Grazvydas Ignotas4e924a82010-02-27 17:06:09 +0200526 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100527 ret = bq27x00_simple_value(di->cache.time_to_empty, val);
Grazvydas Ignotas4e924a82010-02-27 17:06:09 +0200528 break;
529 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100530 ret = bq27x00_simple_value(di->cache.time_to_empty_avg, val);
Grazvydas Ignotas4e924a82010-02-27 17:06:09 +0200531 break;
532 case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100533 ret = bq27x00_simple_value(di->cache.time_to_full, val);
Grazvydas Ignotas4e924a82010-02-27 17:06:09 +0200534 break;
Lars-Peter Clausen5661f332010-05-24 20:36:52 +0200535 case POWER_SUPPLY_PROP_TECHNOLOGY:
536 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
537 break;
Pali Rohár631c17e2011-02-01 00:08:02 +0100538 case POWER_SUPPLY_PROP_CHARGE_NOW:
539 ret = bq27x00_simple_value(bq27x00_battery_read_nac(di), val);
540 break;
541 case POWER_SUPPLY_PROP_CHARGE_FULL:
542 ret = bq27x00_simple_value(di->cache.charge_full, val);
543 break;
544 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
545 ret = bq27x00_simple_value(di->charge_design_full, val);
546 break;
Pali Rohár73c244a2011-04-30 23:59:35 +0200547 case POWER_SUPPLY_PROP_CYCLE_COUNT:
548 ret = bq27x00_simple_value(di->cache.cycle_count, val);
Pali Rohár631c17e2011-02-01 00:08:02 +0100549 break;
550 case POWER_SUPPLY_PROP_ENERGY_NOW:
Pali Rohára8f6bd22011-11-01 01:43:06 +0100551 ret = bq27x00_simple_value(di->cache.energy, val);
Pali Rohár631c17e2011-02-01 00:08:02 +0100552 break;
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700553 default:
554 return -EINVAL;
555 }
556
Grazvydas Ignotas4e924a82010-02-27 17:06:09 +0200557 return ret;
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700558}
559
Lars-Peter Clausen740b7552011-01-07 20:14:53 +0100560static void bq27x00_external_power_changed(struct power_supply *psy)
561{
562 struct bq27x00_device_info *di = to_bq27x00_device_info(psy);
563
564 cancel_delayed_work_sync(&di->work);
565 schedule_delayed_work(&di->work, 0);
566}
567
Lars-Peter Clausena40402e2010-05-24 19:37:58 +0200568static int bq27x00_powersupply_init(struct bq27x00_device_info *di)
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700569{
Lars-Peter Clausena40402e2010-05-24 19:37:58 +0200570 int ret;
571
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700572 di->bat.type = POWER_SUPPLY_TYPE_BATTERY;
573 di->bat.properties = bq27x00_battery_props;
574 di->bat.num_properties = ARRAY_SIZE(bq27x00_battery_props);
575 di->bat.get_property = bq27x00_battery_get_property;
Lars-Peter Clausen740b7552011-01-07 20:14:53 +0100576 di->bat.external_power_changed = bq27x00_external_power_changed;
577
578 INIT_DELAYED_WORK(&di->work, bq27x00_battery_poll);
579 mutex_init(&di->lock);
Lars-Peter Clausena40402e2010-05-24 19:37:58 +0200580
581 ret = power_supply_register(di->dev, &di->bat);
582 if (ret) {
583 dev_err(di->dev, "failed to register battery: %d\n", ret);
584 return ret;
585 }
586
587 dev_info(di->dev, "support ver. %s enabled\n", DRIVER_VERSION);
588
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100589 bq27x00_update(di);
590
Lars-Peter Clausena40402e2010-05-24 19:37:58 +0200591 return 0;
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700592}
593
Lars-Peter Clausen740b7552011-01-07 20:14:53 +0100594static void bq27x00_powersupply_unregister(struct bq27x00_device_info *di)
595{
Pali Rohár8cfaaa82011-11-01 01:43:11 +0100596 /*
597 * power_supply_unregister call bq27x00_battery_get_property which
598 * call bq27x00_battery_poll.
599 * Make sure that bq27x00_battery_poll will not call
600 * schedule_delayed_work again after unregister (which cause OOPS).
601 */
602 poll_interval = 0;
603
Lars-Peter Clausen740b7552011-01-07 20:14:53 +0100604 cancel_delayed_work_sync(&di->work);
605
606 power_supply_unregister(&di->bat);
607
608 mutex_destroy(&di->lock);
609}
610
Lars-Peter Clausen7fb7ba52010-05-24 19:55:27 +0200611
612/* i2c specific code */
613#ifdef CONFIG_BATTERY_BQ27X00_I2C
614
615/* If the system has several batteries we need a different name for each
616 * of them...
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700617 */
Lars-Peter Clausen7fb7ba52010-05-24 19:55:27 +0200618static DEFINE_IDR(battery_id);
619static DEFINE_MUTEX(battery_mutex);
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700620
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100621static int bq27x00_read_i2c(struct bq27x00_device_info *di, u8 reg, bool single)
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700622{
Lars-Peter Clausena40402e2010-05-24 19:37:58 +0200623 struct i2c_client *client = to_i2c_client(di->dev);
Grazvydas Ignotas9e912f42011-02-15 23:27:35 +0200624 struct i2c_msg msg[2];
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700625 unsigned char data[2];
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100626 int ret;
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700627
628 if (!client->adapter)
629 return -ENODEV;
630
Grazvydas Ignotas9e912f42011-02-15 23:27:35 +0200631 msg[0].addr = client->addr;
632 msg[0].flags = 0;
633 msg[0].buf = &reg;
634 msg[0].len = sizeof(reg);
635 msg[1].addr = client->addr;
636 msg[1].flags = I2C_M_RD;
637 msg[1].buf = data;
Lars-Peter Clausen2ec523a2011-02-02 19:35:07 +0100638 if (single)
Grazvydas Ignotas9e912f42011-02-15 23:27:35 +0200639 msg[1].len = 1;
Lars-Peter Clausen2ec523a2011-02-02 19:35:07 +0100640 else
Grazvydas Ignotas9e912f42011-02-15 23:27:35 +0200641 msg[1].len = 2;
Lars-Peter Clausen2ec523a2011-02-02 19:35:07 +0100642
Grazvydas Ignotas9e912f42011-02-15 23:27:35 +0200643 ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
Lars-Peter Clausen2ec523a2011-02-02 19:35:07 +0100644 if (ret < 0)
645 return ret;
646
647 if (!single)
648 ret = get_unaligned_le16(data);
649 else
650 ret = data[0];
651
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100652 return ret;
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700653}
654
Grazvydas Ignotase20908d2010-02-12 23:57:23 +0200655static int bq27x00_battery_probe(struct i2c_client *client,
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700656 const struct i2c_device_id *id)
657{
658 char *name;
659 struct bq27x00_device_info *di;
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700660 int num;
661 int retval = 0;
662
663 /* Get new ID for the new battery device */
664 retval = idr_pre_get(&battery_id, GFP_KERNEL);
665 if (retval == 0)
666 return -ENOMEM;
667 mutex_lock(&battery_mutex);
668 retval = idr_get_new(&battery_id, client, &num);
669 mutex_unlock(&battery_mutex);
670 if (retval < 0)
671 return retval;
672
Grazvydas Ignotase20908d2010-02-12 23:57:23 +0200673 name = kasprintf(GFP_KERNEL, "%s-%d", id->name, num);
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700674 if (!name) {
675 dev_err(&client->dev, "failed to allocate device name\n");
676 retval = -ENOMEM;
677 goto batt_failed_1;
678 }
679
680 di = kzalloc(sizeof(*di), GFP_KERNEL);
681 if (!di) {
682 dev_err(&client->dev, "failed to allocate device info data\n");
683 retval = -ENOMEM;
684 goto batt_failed_2;
685 }
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700686
Lars-Peter Clausena40402e2010-05-24 19:37:58 +0200687 di->id = num;
688 di->dev = &client->dev;
689 di->chip = id->driver_data;
690 di->bat.name = name;
691 di->bus.read = &bq27x00_read_i2c;
692
693 if (bq27x00_powersupply_init(di))
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700694 goto batt_failed_3;
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700695
696 i2c_set_clientdata(client, di);
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700697
698 return 0;
699
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700700batt_failed_3:
701 kfree(di);
702batt_failed_2:
703 kfree(name);
704batt_failed_1:
705 mutex_lock(&battery_mutex);
706 idr_remove(&battery_id, num);
707 mutex_unlock(&battery_mutex);
708
709 return retval;
710}
711
Grazvydas Ignotase20908d2010-02-12 23:57:23 +0200712static int bq27x00_battery_remove(struct i2c_client *client)
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700713{
714 struct bq27x00_device_info *di = i2c_get_clientdata(client);
715
Lars-Peter Clausen740b7552011-01-07 20:14:53 +0100716 bq27x00_powersupply_unregister(di);
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700717
718 kfree(di->bat.name);
719
720 mutex_lock(&battery_mutex);
721 idr_remove(&battery_id, di->id);
722 mutex_unlock(&battery_mutex);
723
724 kfree(di);
725
726 return 0;
727}
728
Grazvydas Ignotase20908d2010-02-12 23:57:23 +0200729static const struct i2c_device_id bq27x00_id[] = {
730 { "bq27200", BQ27000 }, /* bq27200 is same as bq27000, but with i2c */
731 { "bq27500", BQ27500 },
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700732 {},
733};
Pali Rohárfd9b9582011-02-01 00:10:41 +0100734MODULE_DEVICE_TABLE(i2c, bq27x00_id);
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700735
Grazvydas Ignotase20908d2010-02-12 23:57:23 +0200736static struct i2c_driver bq27x00_battery_driver = {
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700737 .driver = {
Grazvydas Ignotase20908d2010-02-12 23:57:23 +0200738 .name = "bq27x00-battery",
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700739 },
Grazvydas Ignotase20908d2010-02-12 23:57:23 +0200740 .probe = bq27x00_battery_probe,
741 .remove = bq27x00_battery_remove,
742 .id_table = bq27x00_id,
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700743};
744
Lars-Peter Clausen7fb7ba52010-05-24 19:55:27 +0200745static inline int bq27x00_battery_i2c_init(void)
746{
747 int ret = i2c_add_driver(&bq27x00_battery_driver);
748 if (ret)
749 printk(KERN_ERR "Unable to register BQ27x00 i2c driver\n");
750
751 return ret;
752}
753
754static inline void bq27x00_battery_i2c_exit(void)
755{
756 i2c_del_driver(&bq27x00_battery_driver);
757}
758
759#else
760
761static inline int bq27x00_battery_i2c_init(void) { return 0; }
762static inline void bq27x00_battery_i2c_exit(void) {};
763
764#endif
765
766/* platform specific code */
767#ifdef CONFIG_BATTERY_BQ27X00_PLATFORM
768
769static int bq27000_read_platform(struct bq27x00_device_info *di, u8 reg,
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100770 bool single)
Lars-Peter Clausen7fb7ba52010-05-24 19:55:27 +0200771{
772 struct device *dev = di->dev;
773 struct bq27000_platform_data *pdata = dev->platform_data;
774 unsigned int timeout = 3;
775 int upper, lower;
776 int temp;
777
778 if (!single) {
779 /* Make sure the value has not changed in between reading the
780 * lower and the upper part */
781 upper = pdata->read(dev, reg + 1);
782 do {
783 temp = upper;
784 if (upper < 0)
785 return upper;
786
787 lower = pdata->read(dev, reg);
788 if (lower < 0)
789 return lower;
790
791 upper = pdata->read(dev, reg + 1);
792 } while (temp != upper && --timeout);
793
794 if (timeout == 0)
795 return -EIO;
796
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100797 return (upper << 8) | lower;
Lars-Peter Clausen7fb7ba52010-05-24 19:55:27 +0200798 }
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100799
800 return pdata->read(dev, reg);
Lars-Peter Clausen7fb7ba52010-05-24 19:55:27 +0200801}
802
803static int __devinit bq27000_battery_probe(struct platform_device *pdev)
804{
805 struct bq27x00_device_info *di;
806 struct bq27000_platform_data *pdata = pdev->dev.platform_data;
807 int ret;
808
809 if (!pdata) {
810 dev_err(&pdev->dev, "no platform_data supplied\n");
811 return -EINVAL;
812 }
813
814 if (!pdata->read) {
815 dev_err(&pdev->dev, "no hdq read callback supplied\n");
816 return -EINVAL;
817 }
818
819 di = kzalloc(sizeof(*di), GFP_KERNEL);
820 if (!di) {
821 dev_err(&pdev->dev, "failed to allocate device info data\n");
822 return -ENOMEM;
823 }
824
825 platform_set_drvdata(pdev, di);
826
827 di->dev = &pdev->dev;
828 di->chip = BQ27000;
829
830 di->bat.name = pdata->name ?: dev_name(&pdev->dev);
831 di->bus.read = &bq27000_read_platform;
832
833 ret = bq27x00_powersupply_init(di);
834 if (ret)
835 goto err_free;
836
837 return 0;
838
839err_free:
840 platform_set_drvdata(pdev, NULL);
841 kfree(di);
842
843 return ret;
844}
845
846static int __devexit bq27000_battery_remove(struct platform_device *pdev)
847{
848 struct bq27x00_device_info *di = platform_get_drvdata(pdev);
849
Lars-Peter Clausen740b7552011-01-07 20:14:53 +0100850 bq27x00_powersupply_unregister(di);
851
Lars-Peter Clausen7fb7ba52010-05-24 19:55:27 +0200852 platform_set_drvdata(pdev, NULL);
853 kfree(di);
854
855 return 0;
856}
857
858static struct platform_driver bq27000_battery_driver = {
859 .probe = bq27000_battery_probe,
860 .remove = __devexit_p(bq27000_battery_remove),
861 .driver = {
862 .name = "bq27000-battery",
863 .owner = THIS_MODULE,
864 },
865};
866
867static inline int bq27x00_battery_platform_init(void)
868{
869 int ret = platform_driver_register(&bq27000_battery_driver);
870 if (ret)
871 printk(KERN_ERR "Unable to register BQ27000 platform driver\n");
872
873 return ret;
874}
875
876static inline void bq27x00_battery_platform_exit(void)
877{
878 platform_driver_unregister(&bq27000_battery_driver);
879}
880
881#else
882
883static inline int bq27x00_battery_platform_init(void) { return 0; }
884static inline void bq27x00_battery_platform_exit(void) {};
885
886#endif
887
888/*
889 * Module stuff
890 */
891
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700892static int __init bq27x00_battery_init(void)
893{
894 int ret;
895
Lars-Peter Clausen7fb7ba52010-05-24 19:55:27 +0200896 ret = bq27x00_battery_i2c_init();
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700897 if (ret)
Lars-Peter Clausen7fb7ba52010-05-24 19:55:27 +0200898 return ret;
899
900 ret = bq27x00_battery_platform_init();
901 if (ret)
902 bq27x00_battery_i2c_exit();
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700903
904 return ret;
905}
906module_init(bq27x00_battery_init);
907
908static void __exit bq27x00_battery_exit(void)
909{
Lars-Peter Clausen7fb7ba52010-05-24 19:55:27 +0200910 bq27x00_battery_platform_exit();
911 bq27x00_battery_i2c_exit();
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700912}
913module_exit(bq27x00_battery_exit);
914
915MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
916MODULE_DESCRIPTION("BQ27x00 battery monitor driver");
917MODULE_LICENSE("GPL");