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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
Pali Rohár631c17e2011-02-01 00:08:02 +010050#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 */
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 */
Grazvydas Ignotas4e924a82010-02-27 17:06:09 +020057#define BQ27000_FLAG_CHGS BIT(7)
Lars-Peter Clausenc1b9ab62010-09-18 17:31:16 +020058#define BQ27000_FLAG_FC BIT(5)
Grazvydas Ignotase20908d2010-02-12 23:57:23 +020059
Pali Rohárbf7d4142011-02-01 00:23:13 +010060#define BQ27500_REG_SOC 0x2C
Pali Rohár631c17e2011-02-01 00:08:02 +010061#define BQ27500_REG_DCAP 0x3C /* Design capacity */
Grazvydas Ignotas4e924a82010-02-27 17:06:09 +020062#define BQ27500_FLAG_DSC BIT(0)
63#define BQ27500_FLAG_FC BIT(9)
Grazvydas Ignotase20908d2010-02-12 23:57:23 +020064
Pali Rohára2e51182010-05-24 20:52:13 +020065#define BQ27000_RS 20 /* Resistor sense */
66
Rodolfo Giomettib996ad02008-08-20 16:52:58 -070067struct bq27x00_device_info;
68struct bq27x00_access_methods {
Lars-Peter Clausen297a5332011-01-07 20:12:47 +010069 int (*read)(struct bq27x00_device_info *di, u8 reg, bool single);
Rodolfo Giomettib996ad02008-08-20 16:52:58 -070070};
71
Grazvydas Ignotase20908d2010-02-12 23:57:23 +020072enum bq27x00_chip { BQ27000, BQ27500 };
73
Lars-Peter Clausen297a5332011-01-07 20:12:47 +010074struct bq27x00_reg_cache {
75 int temperature;
76 int time_to_empty;
77 int time_to_empty_avg;
78 int time_to_full;
Pali Rohár631c17e2011-02-01 00:08:02 +010079 int charge_full;
Pali Rohár73c244a2011-04-30 23:59:35 +020080 int cycle_count;
Lars-Peter Clausen297a5332011-01-07 20:12:47 +010081 int capacity;
82 int flags;
83
84 int current_now;
85};
86
Rodolfo Giomettib996ad02008-08-20 16:52:58 -070087struct bq27x00_device_info {
88 struct device *dev;
89 int id;
Grazvydas Ignotase20908d2010-02-12 23:57:23 +020090 enum bq27x00_chip chip;
Rodolfo Giomettib996ad02008-08-20 16:52:58 -070091
Lars-Peter Clausen297a5332011-01-07 20:12:47 +010092 struct bq27x00_reg_cache cache;
Pali Rohár631c17e2011-02-01 00:08:02 +010093 int charge_design_full;
94
Lars-Peter Clausen297a5332011-01-07 20:12:47 +010095 unsigned long last_update;
Lars-Peter Clausen740b7552011-01-07 20:14:53 +010096 struct delayed_work work;
Lars-Peter Clausen297a5332011-01-07 20:12:47 +010097
Lars-Peter Clausena40402e2010-05-24 19:37:58 +020098 struct power_supply bat;
99
100 struct bq27x00_access_methods bus;
Lars-Peter Clausen740b7552011-01-07 20:14:53 +0100101
102 struct mutex lock;
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700103};
104
105static enum power_supply_property bq27x00_battery_props[] = {
Grazvydas Ignotas4e924a82010-02-27 17:06:09 +0200106 POWER_SUPPLY_PROP_STATUS,
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700107 POWER_SUPPLY_PROP_PRESENT,
108 POWER_SUPPLY_PROP_VOLTAGE_NOW,
109 POWER_SUPPLY_PROP_CURRENT_NOW,
110 POWER_SUPPLY_PROP_CAPACITY,
111 POWER_SUPPLY_PROP_TEMP,
Grazvydas Ignotas4e924a82010-02-27 17:06:09 +0200112 POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
113 POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
114 POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
Lars-Peter Clausen5661f332010-05-24 20:36:52 +0200115 POWER_SUPPLY_PROP_TECHNOLOGY,
Pali Rohár631c17e2011-02-01 00:08:02 +0100116 POWER_SUPPLY_PROP_CHARGE_FULL,
117 POWER_SUPPLY_PROP_CHARGE_NOW,
118 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
Pali Rohár73c244a2011-04-30 23:59:35 +0200119 POWER_SUPPLY_PROP_CYCLE_COUNT,
Pali Rohár631c17e2011-02-01 00:08:02 +0100120 POWER_SUPPLY_PROP_ENERGY_NOW,
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700121};
122
Lars-Peter Clausen740b7552011-01-07 20:14:53 +0100123static unsigned int poll_interval = 360;
124module_param(poll_interval, uint, 0644);
125MODULE_PARM_DESC(poll_interval, "battery poll interval in seconds - " \
126 "0 disables polling");
127
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700128/*
129 * Common code for BQ27x00 devices
130 */
131
Lars-Peter Clausena40402e2010-05-24 19:37:58 +0200132static inline int bq27x00_read(struct bq27x00_device_info *di, u8 reg,
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100133 bool single)
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700134{
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100135 return di->bus.read(di, reg, single);
136}
137
138/*
139 * Return the battery Relative State-of-Charge
140 * Or < 0 if something fails.
141 */
142static int bq27x00_battery_read_rsoc(struct bq27x00_device_info *di)
143{
144 int rsoc;
145
146 if (di->chip == BQ27500)
147 rsoc = bq27x00_read(di, BQ27500_REG_SOC, false);
148 else
149 rsoc = bq27x00_read(di, BQ27000_REG_RSOC, true);
150
151 if (rsoc < 0)
152 dev_err(di->dev, "error reading relative State-of-Charge\n");
153
154 return rsoc;
155}
156
157/*
Pali Rohár631c17e2011-02-01 00:08:02 +0100158 * Return a battery charge value in µAh
159 * Or < 0 if something fails.
160 */
161static int bq27x00_battery_read_charge(struct bq27x00_device_info *di, u8 reg)
162{
163 int charge;
164
165 charge = bq27x00_read(di, reg, false);
166 if (charge < 0) {
167 dev_err(di->dev, "error reading nominal available capacity\n");
168 return charge;
169 }
170
171 if (di->chip == BQ27500)
172 charge *= 1000;
173 else
174 charge = charge * 3570 / BQ27000_RS;
175
176 return charge;
177}
178
179/*
180 * Return the battery Nominal available capaciy in µAh
181 * Or < 0 if something fails.
182 */
183static inline int bq27x00_battery_read_nac(struct bq27x00_device_info *di)
184{
185 return bq27x00_battery_read_charge(di, BQ27x00_REG_NAC);
186}
187
188/*
189 * Return the battery Last measured discharge in µAh
190 * Or < 0 if something fails.
191 */
192static inline int bq27x00_battery_read_lmd(struct bq27x00_device_info *di)
193{
194 return bq27x00_battery_read_charge(di, BQ27x00_REG_LMD);
195}
196
197/*
198 * Return the battery Initial last measured discharge in µAh
199 * Or < 0 if something fails.
200 */
201static int bq27x00_battery_read_ilmd(struct bq27x00_device_info *di)
202{
203 int ilmd;
204
205 if (di->chip == BQ27500)
206 ilmd = bq27x00_read(di, BQ27500_REG_DCAP, false);
207 else
208 ilmd = bq27x00_read(di, BQ27000_REG_ILMD, true);
209
210 if (ilmd < 0) {
211 dev_err(di->dev, "error reading initial last measured discharge\n");
212 return ilmd;
213 }
214
215 if (di->chip == BQ27500)
216 ilmd *= 1000;
217 else
218 ilmd = ilmd * 256 * 3570 / BQ27000_RS;
219
220 return ilmd;
221}
222
223/*
224 * Return the battery Cycle count total
225 * Or < 0 if something fails.
226 */
227static int bq27x00_battery_read_cyct(struct bq27x00_device_info *di)
228{
229 int cyct;
230
231 cyct = bq27x00_read(di, BQ27x00_REG_CYCT, false);
232 if (cyct < 0)
233 dev_err(di->dev, "error reading cycle count total\n");
234
235 return cyct;
236}
237
238/*
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100239 * Read a time register.
240 * Return < 0 if something fails.
241 */
242static int bq27x00_battery_read_time(struct bq27x00_device_info *di, u8 reg)
243{
244 int tval;
245
246 tval = bq27x00_read(di, reg, false);
247 if (tval < 0) {
248 dev_err(di->dev, "error reading register %02x: %d\n", reg, tval);
249 return tval;
250 }
251
252 if (tval == 65535)
253 return -ENODATA;
254
255 return tval * 60;
256}
257
258static void bq27x00_update(struct bq27x00_device_info *di)
259{
260 struct bq27x00_reg_cache cache = {0, };
261 bool is_bq27500 = di->chip == BQ27500;
262
263 cache.flags = bq27x00_read(di, BQ27x00_REG_FLAGS, is_bq27500);
264 if (cache.flags >= 0) {
265 cache.capacity = bq27x00_battery_read_rsoc(di);
266 cache.temperature = bq27x00_read(di, BQ27x00_REG_TEMP, false);
267 cache.time_to_empty = bq27x00_battery_read_time(di, BQ27x00_REG_TTE);
268 cache.time_to_empty_avg = bq27x00_battery_read_time(di, BQ27x00_REG_TTECP);
269 cache.time_to_full = bq27x00_battery_read_time(di, BQ27x00_REG_TTF);
Pali Rohár631c17e2011-02-01 00:08:02 +0100270 cache.charge_full = bq27x00_battery_read_lmd(di);
Pali Rohár73c244a2011-04-30 23:59:35 +0200271 cache.cycle_count = bq27x00_battery_read_cyct(di);
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100272
273 if (!is_bq27500)
274 cache.current_now = bq27x00_read(di, BQ27x00_REG_AI, false);
Pali Rohár631c17e2011-02-01 00:08:02 +0100275
276 /* We only have to read charge design full once */
277 if (di->charge_design_full <= 0)
278 di->charge_design_full = bq27x00_battery_read_ilmd(di);
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100279 }
280
281 /* Ignore current_now which is a snapshot of the current battery state
282 * and is likely to be different even between two consecutive reads */
283 if (memcmp(&di->cache, &cache, sizeof(cache) - sizeof(int)) != 0) {
284 di->cache = cache;
285 power_supply_changed(&di->bat);
286 }
287
288 di->last_update = jiffies;
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700289}
290
Lars-Peter Clausen740b7552011-01-07 20:14:53 +0100291static void bq27x00_battery_poll(struct work_struct *work)
292{
293 struct bq27x00_device_info *di =
294 container_of(work, struct bq27x00_device_info, work.work);
295
296 bq27x00_update(di);
297
298 if (poll_interval > 0) {
299 /* The timer does not have to be accurate. */
300 set_timer_slack(&di->work.timer, poll_interval * HZ / 4);
301 schedule_delayed_work(&di->work, poll_interval * HZ);
302 }
303}
304
305
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700306/*
Grazvydas Ignotasb4de3602010-02-12 23:57:13 +0200307 * Return the battery temperature in tenths of degree Celsius
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700308 * Or < 0 if something fails.
309 */
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100310static int bq27x00_battery_temperature(struct bq27x00_device_info *di,
311 union power_supply_propval *val)
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700312{
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100313 if (di->cache.temperature < 0)
314 return di->cache.temperature;
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700315
Grazvydas Ignotase20908d2010-02-12 23:57:23 +0200316 if (di->chip == BQ27500)
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100317 val->intval = di->cache.temperature - 2731;
Grazvydas Ignotase20908d2010-02-12 23:57:23 +0200318 else
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100319 val->intval = ((di->cache.temperature * 5) - 5463) / 2;
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700320
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100321 return 0;
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700322}
323
324/*
Pali Rohárbf7d4142011-02-01 00:23:13 +0100325 * Return the battery average current in µA
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700326 * Note that current can be negative signed as well
327 * Or 0 if something fails.
328 */
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100329static int bq27x00_battery_current(struct bq27x00_device_info *di,
330 union power_supply_propval *val)
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700331{
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100332 int curr;
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700333
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100334 if (di->chip == BQ27500)
335 curr = bq27x00_read(di, BQ27x00_REG_AI, false);
336 else
337 curr = di->cache.current_now;
338
339 if (curr < 0)
340 return curr;
Grazvydas Ignotase20908d2010-02-12 23:57:23 +0200341
342 if (di->chip == BQ27500) {
343 /* bq27500 returns signed value */
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100344 val->intval = (int)((s16)curr) * 1000;
Grazvydas Ignotase20908d2010-02-12 23:57:23 +0200345 } else {
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100346 if (di->cache.flags & BQ27000_FLAG_CHGS) {
Grazvydas Ignotase20908d2010-02-12 23:57:23 +0200347 dev_dbg(di->dev, "negative current!\n");
Grazvydas Ignotasafbc74fd2010-02-27 17:06:44 +0200348 curr = -curr;
Grazvydas Ignotase20908d2010-02-12 23:57:23 +0200349 }
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100350
351 val->intval = curr * 3570 / BQ27000_RS;
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700352 }
Grazvydas Ignotase20908d2010-02-12 23:57:23 +0200353
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100354 return 0;
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700355}
356
Grazvydas Ignotas4e924a82010-02-27 17:06:09 +0200357static int bq27x00_battery_status(struct bq27x00_device_info *di,
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100358 union power_supply_propval *val)
Grazvydas Ignotas4e924a82010-02-27 17:06:09 +0200359{
Grazvydas Ignotas4e924a82010-02-27 17:06:09 +0200360 int status;
Grazvydas Ignotas4e924a82010-02-27 17:06:09 +0200361
362 if (di->chip == BQ27500) {
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100363 if (di->cache.flags & BQ27500_FLAG_FC)
Grazvydas Ignotas4e924a82010-02-27 17:06:09 +0200364 status = POWER_SUPPLY_STATUS_FULL;
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100365 else if (di->cache.flags & BQ27500_FLAG_DSC)
Grazvydas Ignotas4e924a82010-02-27 17:06:09 +0200366 status = POWER_SUPPLY_STATUS_DISCHARGING;
367 else
368 status = POWER_SUPPLY_STATUS_CHARGING;
369 } else {
Lars-Peter Clausenc1b9ab62010-09-18 17:31:16 +0200370 if (di->cache.flags & BQ27000_FLAG_FC)
371 status = POWER_SUPPLY_STATUS_FULL;
372 else if (di->cache.flags & BQ27000_FLAG_CHGS)
Grazvydas Ignotas4e924a82010-02-27 17:06:09 +0200373 status = POWER_SUPPLY_STATUS_CHARGING;
Lars-Peter Clausenc1b9ab62010-09-18 17:31:16 +0200374 else if (power_supply_am_i_supplied(&di->bat))
375 status = POWER_SUPPLY_STATUS_NOT_CHARGING;
Grazvydas Ignotas4e924a82010-02-27 17:06:09 +0200376 else
377 status = POWER_SUPPLY_STATUS_DISCHARGING;
378 }
379
380 val->intval = status;
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100381
Grazvydas Ignotas4e924a82010-02-27 17:06:09 +0200382 return 0;
383}
384
385/*
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100386 * Return the battery Voltage in milivolts
387 * Or < 0 if something fails.
Grazvydas Ignotas4e924a82010-02-27 17:06:09 +0200388 */
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100389static int bq27x00_battery_voltage(struct bq27x00_device_info *di,
390 union power_supply_propval *val)
Grazvydas Ignotas4e924a82010-02-27 17:06:09 +0200391{
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100392 int volt;
Grazvydas Ignotas4e924a82010-02-27 17:06:09 +0200393
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100394 volt = bq27x00_read(di, BQ27x00_REG_VOLT, false);
395 if (volt < 0)
396 return volt;
Grazvydas Ignotas4e924a82010-02-27 17:06:09 +0200397
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100398 val->intval = volt * 1000;
Grazvydas Ignotas4e924a82010-02-27 17:06:09 +0200399
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100400 return 0;
401}
402
Pali Rohár631c17e2011-02-01 00:08:02 +0100403/*
404 * Return the battery Available energy in µWh
405 * Or < 0 if something fails.
406 */
407static int bq27x00_battery_energy(struct bq27x00_device_info *di,
408 union power_supply_propval *val)
409{
410 int ae;
411
412 ae = bq27x00_read(di, BQ27x00_REG_AE, false);
413 if (ae < 0) {
414 dev_err(di->dev, "error reading available energy\n");
415 return ae;
416 }
417
418 if (di->chip == BQ27500)
419 ae *= 1000;
420 else
421 ae = ae * 29200 / BQ27000_RS;
422
423 val->intval = ae;
424
425 return 0;
426}
427
428
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100429static int bq27x00_simple_value(int value,
430 union power_supply_propval *val)
431{
432 if (value < 0)
433 return value;
434
435 val->intval = value;
436
Grazvydas Ignotas4e924a82010-02-27 17:06:09 +0200437 return 0;
438}
439
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700440#define to_bq27x00_device_info(x) container_of((x), \
441 struct bq27x00_device_info, bat);
442
443static int bq27x00_battery_get_property(struct power_supply *psy,
444 enum power_supply_property psp,
445 union power_supply_propval *val)
446{
Grazvydas Ignotas4e924a82010-02-27 17:06:09 +0200447 int ret = 0;
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700448 struct bq27x00_device_info *di = to_bq27x00_device_info(psy);
Lars-Peter Clausen3413b4e2010-05-24 21:57:33 +0200449
Lars-Peter Clausen740b7552011-01-07 20:14:53 +0100450 mutex_lock(&di->lock);
451 if (time_is_before_jiffies(di->last_update + 5 * HZ)) {
452 cancel_delayed_work_sync(&di->work);
453 bq27x00_battery_poll(&di->work.work);
454 }
455 mutex_unlock(&di->lock);
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100456
457 if (psp != POWER_SUPPLY_PROP_PRESENT && di->cache.flags < 0)
Lars-Peter Clausen3413b4e2010-05-24 21:57:33 +0200458 return -ENODEV;
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700459
460 switch (psp) {
Grazvydas Ignotas4e924a82010-02-27 17:06:09 +0200461 case POWER_SUPPLY_PROP_STATUS:
462 ret = bq27x00_battery_status(di, val);
463 break;
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700464 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100465 ret = bq27x00_battery_voltage(di, val);
Lars-Peter Clausen3413b4e2010-05-24 21:57:33 +0200466 break;
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700467 case POWER_SUPPLY_PROP_PRESENT:
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100468 val->intval = di->cache.flags < 0 ? 0 : 1;
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700469 break;
470 case POWER_SUPPLY_PROP_CURRENT_NOW:
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100471 ret = bq27x00_battery_current(di, val);
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700472 break;
473 case POWER_SUPPLY_PROP_CAPACITY:
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100474 ret = bq27x00_simple_value(di->cache.capacity, val);
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700475 break;
476 case POWER_SUPPLY_PROP_TEMP:
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100477 ret = bq27x00_battery_temperature(di, val);
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700478 break;
Grazvydas Ignotas4e924a82010-02-27 17:06:09 +0200479 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100480 ret = bq27x00_simple_value(di->cache.time_to_empty, val);
Grazvydas Ignotas4e924a82010-02-27 17:06:09 +0200481 break;
482 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100483 ret = bq27x00_simple_value(di->cache.time_to_empty_avg, val);
Grazvydas Ignotas4e924a82010-02-27 17:06:09 +0200484 break;
485 case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100486 ret = bq27x00_simple_value(di->cache.time_to_full, val);
Grazvydas Ignotas4e924a82010-02-27 17:06:09 +0200487 break;
Lars-Peter Clausen5661f332010-05-24 20:36:52 +0200488 case POWER_SUPPLY_PROP_TECHNOLOGY:
489 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
490 break;
Pali Rohár631c17e2011-02-01 00:08:02 +0100491 case POWER_SUPPLY_PROP_CHARGE_NOW:
492 ret = bq27x00_simple_value(bq27x00_battery_read_nac(di), val);
493 break;
494 case POWER_SUPPLY_PROP_CHARGE_FULL:
495 ret = bq27x00_simple_value(di->cache.charge_full, val);
496 break;
497 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
498 ret = bq27x00_simple_value(di->charge_design_full, val);
499 break;
Pali Rohár73c244a2011-04-30 23:59:35 +0200500 case POWER_SUPPLY_PROP_CYCLE_COUNT:
501 ret = bq27x00_simple_value(di->cache.cycle_count, val);
Pali Rohár631c17e2011-02-01 00:08:02 +0100502 break;
503 case POWER_SUPPLY_PROP_ENERGY_NOW:
504 ret = bq27x00_battery_energy(di, val);
505 break;
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700506 default:
507 return -EINVAL;
508 }
509
Grazvydas Ignotas4e924a82010-02-27 17:06:09 +0200510 return ret;
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700511}
512
Lars-Peter Clausen740b7552011-01-07 20:14:53 +0100513static void bq27x00_external_power_changed(struct power_supply *psy)
514{
515 struct bq27x00_device_info *di = to_bq27x00_device_info(psy);
516
517 cancel_delayed_work_sync(&di->work);
518 schedule_delayed_work(&di->work, 0);
519}
520
Lars-Peter Clausena40402e2010-05-24 19:37:58 +0200521static int bq27x00_powersupply_init(struct bq27x00_device_info *di)
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700522{
Lars-Peter Clausena40402e2010-05-24 19:37:58 +0200523 int ret;
524
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700525 di->bat.type = POWER_SUPPLY_TYPE_BATTERY;
526 di->bat.properties = bq27x00_battery_props;
527 di->bat.num_properties = ARRAY_SIZE(bq27x00_battery_props);
528 di->bat.get_property = bq27x00_battery_get_property;
Lars-Peter Clausen740b7552011-01-07 20:14:53 +0100529 di->bat.external_power_changed = bq27x00_external_power_changed;
530
531 INIT_DELAYED_WORK(&di->work, bq27x00_battery_poll);
532 mutex_init(&di->lock);
Lars-Peter Clausena40402e2010-05-24 19:37:58 +0200533
534 ret = power_supply_register(di->dev, &di->bat);
535 if (ret) {
536 dev_err(di->dev, "failed to register battery: %d\n", ret);
537 return ret;
538 }
539
540 dev_info(di->dev, "support ver. %s enabled\n", DRIVER_VERSION);
541
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100542 bq27x00_update(di);
543
Lars-Peter Clausena40402e2010-05-24 19:37:58 +0200544 return 0;
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700545}
546
Lars-Peter Clausen740b7552011-01-07 20:14:53 +0100547static void bq27x00_powersupply_unregister(struct bq27x00_device_info *di)
548{
549 cancel_delayed_work_sync(&di->work);
550
551 power_supply_unregister(&di->bat);
552
553 mutex_destroy(&di->lock);
554}
555
Lars-Peter Clausen7fb7ba52010-05-24 19:55:27 +0200556
557/* i2c specific code */
558#ifdef CONFIG_BATTERY_BQ27X00_I2C
559
560/* If the system has several batteries we need a different name for each
561 * of them...
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700562 */
Lars-Peter Clausen7fb7ba52010-05-24 19:55:27 +0200563static DEFINE_IDR(battery_id);
564static DEFINE_MUTEX(battery_mutex);
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700565
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100566static int bq27x00_read_i2c(struct bq27x00_device_info *di, u8 reg, bool single)
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700567{
Lars-Peter Clausena40402e2010-05-24 19:37:58 +0200568 struct i2c_client *client = to_i2c_client(di->dev);
Grazvydas Ignotas9e912f42011-02-15 23:27:35 +0200569 struct i2c_msg msg[2];
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700570 unsigned char data[2];
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100571 int ret;
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700572
573 if (!client->adapter)
574 return -ENODEV;
575
Grazvydas Ignotas9e912f42011-02-15 23:27:35 +0200576 msg[0].addr = client->addr;
577 msg[0].flags = 0;
578 msg[0].buf = &reg;
579 msg[0].len = sizeof(reg);
580 msg[1].addr = client->addr;
581 msg[1].flags = I2C_M_RD;
582 msg[1].buf = data;
Lars-Peter Clausen2ec523a2011-02-02 19:35:07 +0100583 if (single)
Grazvydas Ignotas9e912f42011-02-15 23:27:35 +0200584 msg[1].len = 1;
Lars-Peter Clausen2ec523a2011-02-02 19:35:07 +0100585 else
Grazvydas Ignotas9e912f42011-02-15 23:27:35 +0200586 msg[1].len = 2;
Lars-Peter Clausen2ec523a2011-02-02 19:35:07 +0100587
Grazvydas Ignotas9e912f42011-02-15 23:27:35 +0200588 ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
Lars-Peter Clausen2ec523a2011-02-02 19:35:07 +0100589 if (ret < 0)
590 return ret;
591
592 if (!single)
593 ret = get_unaligned_le16(data);
594 else
595 ret = data[0];
596
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100597 return ret;
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700598}
599
Grazvydas Ignotase20908d2010-02-12 23:57:23 +0200600static int bq27x00_battery_probe(struct i2c_client *client,
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700601 const struct i2c_device_id *id)
602{
603 char *name;
604 struct bq27x00_device_info *di;
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700605 int num;
606 int retval = 0;
607
608 /* Get new ID for the new battery device */
609 retval = idr_pre_get(&battery_id, GFP_KERNEL);
610 if (retval == 0)
611 return -ENOMEM;
612 mutex_lock(&battery_mutex);
613 retval = idr_get_new(&battery_id, client, &num);
614 mutex_unlock(&battery_mutex);
615 if (retval < 0)
616 return retval;
617
Grazvydas Ignotase20908d2010-02-12 23:57:23 +0200618 name = kasprintf(GFP_KERNEL, "%s-%d", id->name, num);
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700619 if (!name) {
620 dev_err(&client->dev, "failed to allocate device name\n");
621 retval = -ENOMEM;
622 goto batt_failed_1;
623 }
624
625 di = kzalloc(sizeof(*di), GFP_KERNEL);
626 if (!di) {
627 dev_err(&client->dev, "failed to allocate device info data\n");
628 retval = -ENOMEM;
629 goto batt_failed_2;
630 }
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700631
Lars-Peter Clausena40402e2010-05-24 19:37:58 +0200632 di->id = num;
633 di->dev = &client->dev;
634 di->chip = id->driver_data;
635 di->bat.name = name;
636 di->bus.read = &bq27x00_read_i2c;
637
638 if (bq27x00_powersupply_init(di))
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700639 goto batt_failed_3;
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700640
641 i2c_set_clientdata(client, di);
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700642
643 return 0;
644
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700645batt_failed_3:
646 kfree(di);
647batt_failed_2:
648 kfree(name);
649batt_failed_1:
650 mutex_lock(&battery_mutex);
651 idr_remove(&battery_id, num);
652 mutex_unlock(&battery_mutex);
653
654 return retval;
655}
656
Grazvydas Ignotase20908d2010-02-12 23:57:23 +0200657static int bq27x00_battery_remove(struct i2c_client *client)
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700658{
659 struct bq27x00_device_info *di = i2c_get_clientdata(client);
660
Lars-Peter Clausen740b7552011-01-07 20:14:53 +0100661 bq27x00_powersupply_unregister(di);
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700662
663 kfree(di->bat.name);
664
665 mutex_lock(&battery_mutex);
666 idr_remove(&battery_id, di->id);
667 mutex_unlock(&battery_mutex);
668
669 kfree(di);
670
671 return 0;
672}
673
Grazvydas Ignotase20908d2010-02-12 23:57:23 +0200674static const struct i2c_device_id bq27x00_id[] = {
675 { "bq27200", BQ27000 }, /* bq27200 is same as bq27000, but with i2c */
676 { "bq27500", BQ27500 },
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700677 {},
678};
Pali Rohárfd9b9582011-02-01 00:10:41 +0100679MODULE_DEVICE_TABLE(i2c, bq27x00_id);
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700680
Grazvydas Ignotase20908d2010-02-12 23:57:23 +0200681static struct i2c_driver bq27x00_battery_driver = {
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700682 .driver = {
Grazvydas Ignotase20908d2010-02-12 23:57:23 +0200683 .name = "bq27x00-battery",
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700684 },
Grazvydas Ignotase20908d2010-02-12 23:57:23 +0200685 .probe = bq27x00_battery_probe,
686 .remove = bq27x00_battery_remove,
687 .id_table = bq27x00_id,
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700688};
689
Lars-Peter Clausen7fb7ba52010-05-24 19:55:27 +0200690static inline int bq27x00_battery_i2c_init(void)
691{
692 int ret = i2c_add_driver(&bq27x00_battery_driver);
693 if (ret)
694 printk(KERN_ERR "Unable to register BQ27x00 i2c driver\n");
695
696 return ret;
697}
698
699static inline void bq27x00_battery_i2c_exit(void)
700{
701 i2c_del_driver(&bq27x00_battery_driver);
702}
703
704#else
705
706static inline int bq27x00_battery_i2c_init(void) { return 0; }
707static inline void bq27x00_battery_i2c_exit(void) {};
708
709#endif
710
711/* platform specific code */
712#ifdef CONFIG_BATTERY_BQ27X00_PLATFORM
713
714static int bq27000_read_platform(struct bq27x00_device_info *di, u8 reg,
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100715 bool single)
Lars-Peter Clausen7fb7ba52010-05-24 19:55:27 +0200716{
717 struct device *dev = di->dev;
718 struct bq27000_platform_data *pdata = dev->platform_data;
719 unsigned int timeout = 3;
720 int upper, lower;
721 int temp;
722
723 if (!single) {
724 /* Make sure the value has not changed in between reading the
725 * lower and the upper part */
726 upper = pdata->read(dev, reg + 1);
727 do {
728 temp = upper;
729 if (upper < 0)
730 return upper;
731
732 lower = pdata->read(dev, reg);
733 if (lower < 0)
734 return lower;
735
736 upper = pdata->read(dev, reg + 1);
737 } while (temp != upper && --timeout);
738
739 if (timeout == 0)
740 return -EIO;
741
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100742 return (upper << 8) | lower;
Lars-Peter Clausen7fb7ba52010-05-24 19:55:27 +0200743 }
Lars-Peter Clausen297a5332011-01-07 20:12:47 +0100744
745 return pdata->read(dev, reg);
Lars-Peter Clausen7fb7ba52010-05-24 19:55:27 +0200746}
747
748static int __devinit bq27000_battery_probe(struct platform_device *pdev)
749{
750 struct bq27x00_device_info *di;
751 struct bq27000_platform_data *pdata = pdev->dev.platform_data;
752 int ret;
753
754 if (!pdata) {
755 dev_err(&pdev->dev, "no platform_data supplied\n");
756 return -EINVAL;
757 }
758
759 if (!pdata->read) {
760 dev_err(&pdev->dev, "no hdq read callback supplied\n");
761 return -EINVAL;
762 }
763
764 di = kzalloc(sizeof(*di), GFP_KERNEL);
765 if (!di) {
766 dev_err(&pdev->dev, "failed to allocate device info data\n");
767 return -ENOMEM;
768 }
769
770 platform_set_drvdata(pdev, di);
771
772 di->dev = &pdev->dev;
773 di->chip = BQ27000;
774
775 di->bat.name = pdata->name ?: dev_name(&pdev->dev);
776 di->bus.read = &bq27000_read_platform;
777
778 ret = bq27x00_powersupply_init(di);
779 if (ret)
780 goto err_free;
781
782 return 0;
783
784err_free:
785 platform_set_drvdata(pdev, NULL);
786 kfree(di);
787
788 return ret;
789}
790
791static int __devexit bq27000_battery_remove(struct platform_device *pdev)
792{
793 struct bq27x00_device_info *di = platform_get_drvdata(pdev);
794
Lars-Peter Clausen740b7552011-01-07 20:14:53 +0100795 bq27x00_powersupply_unregister(di);
796
Lars-Peter Clausen7fb7ba52010-05-24 19:55:27 +0200797 platform_set_drvdata(pdev, NULL);
798 kfree(di);
799
800 return 0;
801}
802
803static struct platform_driver bq27000_battery_driver = {
804 .probe = bq27000_battery_probe,
805 .remove = __devexit_p(bq27000_battery_remove),
806 .driver = {
807 .name = "bq27000-battery",
808 .owner = THIS_MODULE,
809 },
810};
811
812static inline int bq27x00_battery_platform_init(void)
813{
814 int ret = platform_driver_register(&bq27000_battery_driver);
815 if (ret)
816 printk(KERN_ERR "Unable to register BQ27000 platform driver\n");
817
818 return ret;
819}
820
821static inline void bq27x00_battery_platform_exit(void)
822{
823 platform_driver_unregister(&bq27000_battery_driver);
824}
825
826#else
827
828static inline int bq27x00_battery_platform_init(void) { return 0; }
829static inline void bq27x00_battery_platform_exit(void) {};
830
831#endif
832
833/*
834 * Module stuff
835 */
836
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700837static int __init bq27x00_battery_init(void)
838{
839 int ret;
840
Lars-Peter Clausen7fb7ba52010-05-24 19:55:27 +0200841 ret = bq27x00_battery_i2c_init();
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700842 if (ret)
Lars-Peter Clausen7fb7ba52010-05-24 19:55:27 +0200843 return ret;
844
845 ret = bq27x00_battery_platform_init();
846 if (ret)
847 bq27x00_battery_i2c_exit();
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700848
849 return ret;
850}
851module_init(bq27x00_battery_init);
852
853static void __exit bq27x00_battery_exit(void)
854{
Lars-Peter Clausen7fb7ba52010-05-24 19:55:27 +0200855 bq27x00_battery_platform_exit();
856 bq27x00_battery_i2c_exit();
Rodolfo Giomettib996ad02008-08-20 16:52:58 -0700857}
858module_exit(bq27x00_battery_exit);
859
860MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
861MODULE_DESCRIPTION("BQ27x00 battery monitor driver");
862MODULE_LICENSE("GPL");