blob: ed4d756d21e4bd7f660e7b5d007b68829c6e95bb [file] [log] [blame]
Ryan Mallonbfdb46c2009-06-18 11:26:26 +12001/*
2 * I2C client/driver for the Maxim/Dallas DS2782 Stand-Alone Fuel Gauge IC
3 *
4 * Copyright (C) 2009 Bluewater Systems Ltd
5 *
Ryan Mallon1c5454e2011-06-15 14:45:36 +10006 * Author: Ryan Mallon
Ryan Mallonbfdb46c2009-06-18 11:26:26 +12007 *
Yulia Vilensky9b9ade62010-04-26 14:05:25 +03008 * DS2786 added by Yulia Vilensky <vilensky@compulab.co.il>
9 *
Evgeny Romanov7cee9ae2013-01-10 12:24:48 +030010 * UEvent sending added by Evgeny Romanov <romanov@neurosoft.ru>
11 *
Ryan Mallonbfdb46c2009-06-18 11:26:26 +120012 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License version 2 as
14 * published by the Free Software Foundation.
15 *
16 */
17
18#include <linux/kernel.h>
19#include <linux/module.h>
20#include <linux/types.h>
21#include <linux/errno.h>
22#include <linux/swab.h>
23#include <linux/i2c.h>
Evgeny Romanov7cee9ae2013-01-10 12:24:48 +030024#include <linux/delay.h>
Ryan Mallonbfdb46c2009-06-18 11:26:26 +120025#include <linux/idr.h>
26#include <linux/power_supply.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090027#include <linux/slab.h>
Yulia Vilensky9b9ade62010-04-26 14:05:25 +030028#include <linux/ds2782_battery.h>
Ryan Mallonbfdb46c2009-06-18 11:26:26 +120029
30#define DS2782_REG_RARC 0x06 /* Remaining active relative capacity */
31
Yulia Vilensky9b9ade62010-04-26 14:05:25 +030032#define DS278x_REG_VOLT_MSB 0x0c
33#define DS278x_REG_TEMP_MSB 0x0a
34#define DS278x_REG_CURRENT_MSB 0x0e
Ryan Mallonbfdb46c2009-06-18 11:26:26 +120035
36/* EEPROM Block */
37#define DS2782_REG_RSNSP 0x69 /* Sense resistor value */
38
39/* Current unit measurement in uA for a 1 milli-ohm sense resistor */
40#define DS2782_CURRENT_UNITS 1563
41
Yulia Vilensky9b9ade62010-04-26 14:05:25 +030042#define DS2786_REG_RARC 0x02 /* Remaining active relative capacity */
Ryan Mallonbfdb46c2009-06-18 11:26:26 +120043
Yulia Vilensky9b9ade62010-04-26 14:05:25 +030044#define DS2786_CURRENT_UNITS 25
45
Evgeny Romanov7cee9ae2013-01-10 12:24:48 +030046#define DS278x_DELAY 1000
47
Yulia Vilensky9b9ade62010-04-26 14:05:25 +030048struct ds278x_info;
49
50struct ds278x_battery_ops {
Peter Hueweeb9650d2010-05-13 01:54:57 +020051 int (*get_battery_current)(struct ds278x_info *info, int *current_uA);
Ryan Mallon353f8672010-10-01 14:17:42 -070052 int (*get_battery_voltage)(struct ds278x_info *info, int *voltage_uV);
53 int (*get_battery_capacity)(struct ds278x_info *info, int *capacity);
Yulia Vilensky9b9ade62010-04-26 14:05:25 +030054};
55
Krzysztof Kozlowski297d7162015-03-12 08:44:11 +010056#define to_ds278x_info(x) power_supply_get_drvdata(x)
Yulia Vilensky9b9ade62010-04-26 14:05:25 +030057
58struct ds278x_info {
Ryan Mallonbfdb46c2009-06-18 11:26:26 +120059 struct i2c_client *client;
Krzysztof Kozlowski297d7162015-03-12 08:44:11 +010060 struct power_supply *battery;
61 struct power_supply_desc battery_desc;
Yulia Vilensky9b9ade62010-04-26 14:05:25 +030062 struct ds278x_battery_ops *ops;
Evgeny Romanov7cee9ae2013-01-10 12:24:48 +030063 struct delayed_work bat_work;
Ryan Mallonbfdb46c2009-06-18 11:26:26 +120064 int id;
Yulia Vilensky9b9ade62010-04-26 14:05:25 +030065 int rsns;
Evgeny Romanov7cee9ae2013-01-10 12:24:48 +030066 int capacity;
67 int status; /* State Of Charge */
Ryan Mallonbfdb46c2009-06-18 11:26:26 +120068};
69
70static DEFINE_IDR(battery_id);
71static DEFINE_MUTEX(battery_lock);
72
Yulia Vilensky9b9ade62010-04-26 14:05:25 +030073static inline int ds278x_read_reg(struct ds278x_info *info, int reg, u8 *val)
Ryan Mallonbfdb46c2009-06-18 11:26:26 +120074{
75 int ret;
76
77 ret = i2c_smbus_read_byte_data(info->client, reg);
78 if (ret < 0) {
79 dev_err(&info->client->dev, "register read failed\n");
80 return ret;
81 }
82
83 *val = ret;
84 return 0;
85}
86
Yulia Vilensky9b9ade62010-04-26 14:05:25 +030087static inline int ds278x_read_reg16(struct ds278x_info *info, int reg_msb,
Ryan Mallonbfdb46c2009-06-18 11:26:26 +120088 s16 *val)
89{
90 int ret;
91
Dan Carpenter85117482012-10-24 10:12:29 +030092 ret = i2c_smbus_read_word_data(info->client, reg_msb);
Ryan Mallonbfdb46c2009-06-18 11:26:26 +120093 if (ret < 0) {
94 dev_err(&info->client->dev, "register read failed\n");
95 return ret;
96 }
97
Dan Carpenter85117482012-10-24 10:12:29 +030098 *val = swab16(ret);
Ryan Mallonbfdb46c2009-06-18 11:26:26 +120099 return 0;
100}
101
Yulia Vilensky9b9ade62010-04-26 14:05:25 +0300102static int ds278x_get_temp(struct ds278x_info *info, int *temp)
Ryan Mallonbfdb46c2009-06-18 11:26:26 +1200103{
104 s16 raw;
105 int err;
106
107 /*
108 * Temperature is measured in units of 0.125 degrees celcius, the
109 * power_supply class measures temperature in tenths of degrees
110 * celsius. The temperature value is stored as a 10 bit number, plus
111 * sign in the upper bits of a 16 bit register.
112 */
Yulia Vilensky9b9ade62010-04-26 14:05:25 +0300113 err = ds278x_read_reg16(info, DS278x_REG_TEMP_MSB, &raw);
Ryan Mallonbfdb46c2009-06-18 11:26:26 +1200114 if (err)
115 return err;
116 *temp = ((raw / 32) * 125) / 100;
117 return 0;
118}
119
Yulia Vilensky9b9ade62010-04-26 14:05:25 +0300120static int ds2782_get_current(struct ds278x_info *info, int *current_uA)
Ryan Mallonbfdb46c2009-06-18 11:26:26 +1200121{
122 int sense_res;
123 int err;
124 u8 sense_res_raw;
125 s16 raw;
126
127 /*
128 * The units of measurement for current are dependent on the value of
129 * the sense resistor.
130 */
Yulia Vilensky9b9ade62010-04-26 14:05:25 +0300131 err = ds278x_read_reg(info, DS2782_REG_RSNSP, &sense_res_raw);
Ryan Mallonbfdb46c2009-06-18 11:26:26 +1200132 if (err)
133 return err;
134 if (sense_res_raw == 0) {
135 dev_err(&info->client->dev, "sense resistor value is 0\n");
136 return -ENXIO;
137 }
138 sense_res = 1000 / sense_res_raw;
139
140 dev_dbg(&info->client->dev, "sense resistor = %d milli-ohms\n",
141 sense_res);
Yulia Vilensky9b9ade62010-04-26 14:05:25 +0300142 err = ds278x_read_reg16(info, DS278x_REG_CURRENT_MSB, &raw);
Ryan Mallonbfdb46c2009-06-18 11:26:26 +1200143 if (err)
144 return err;
145 *current_uA = raw * (DS2782_CURRENT_UNITS / sense_res);
146 return 0;
147}
148
Ryan Mallon353f8672010-10-01 14:17:42 -0700149static int ds2782_get_voltage(struct ds278x_info *info, int *voltage_uV)
Ryan Mallonbfdb46c2009-06-18 11:26:26 +1200150{
151 s16 raw;
152 int err;
153
154 /*
155 * Voltage is measured in units of 4.88mV. The voltage is stored as
156 * a 10-bit number plus sign, in the upper bits of a 16-bit register
157 */
Yulia Vilensky9b9ade62010-04-26 14:05:25 +0300158 err = ds278x_read_reg16(info, DS278x_REG_VOLT_MSB, &raw);
Ryan Mallonbfdb46c2009-06-18 11:26:26 +1200159 if (err)
160 return err;
Ryan Mallon353f8672010-10-01 14:17:42 -0700161 *voltage_uV = (raw / 32) * 4800;
Ryan Mallonbfdb46c2009-06-18 11:26:26 +1200162 return 0;
163}
164
Yulia Vilensky9b9ade62010-04-26 14:05:25 +0300165static int ds2782_get_capacity(struct ds278x_info *info, int *capacity)
Ryan Mallonbfdb46c2009-06-18 11:26:26 +1200166{
167 int err;
168 u8 raw;
169
Yulia Vilensky9b9ade62010-04-26 14:05:25 +0300170 err = ds278x_read_reg(info, DS2782_REG_RARC, &raw);
Ryan Mallonbfdb46c2009-06-18 11:26:26 +1200171 if (err)
172 return err;
173 *capacity = raw;
Ryan Mallon2d317572010-06-15 12:44:59 +1200174 return 0;
Ryan Mallonbfdb46c2009-06-18 11:26:26 +1200175}
176
Yulia Vilensky9b9ade62010-04-26 14:05:25 +0300177static int ds2786_get_current(struct ds278x_info *info, int *current_uA)
178{
179 int err;
180 s16 raw;
181
182 err = ds278x_read_reg16(info, DS278x_REG_CURRENT_MSB, &raw);
183 if (err)
184 return err;
185 *current_uA = (raw / 16) * (DS2786_CURRENT_UNITS / info->rsns);
186 return 0;
187}
188
Ryan Mallon353f8672010-10-01 14:17:42 -0700189static int ds2786_get_voltage(struct ds278x_info *info, int *voltage_uV)
Yulia Vilensky9b9ade62010-04-26 14:05:25 +0300190{
191 s16 raw;
192 int err;
193
194 /*
195 * Voltage is measured in units of 1.22mV. The voltage is stored as
Matthias Brugger1b5e1c62014-01-17 18:02:38 +0100196 * a 12-bit number plus sign, in the upper bits of a 16-bit register
Yulia Vilensky9b9ade62010-04-26 14:05:25 +0300197 */
198 err = ds278x_read_reg16(info, DS278x_REG_VOLT_MSB, &raw);
199 if (err)
200 return err;
Ryan Mallon353f8672010-10-01 14:17:42 -0700201 *voltage_uV = (raw / 8) * 1220;
Yulia Vilensky9b9ade62010-04-26 14:05:25 +0300202 return 0;
203}
204
205static int ds2786_get_capacity(struct ds278x_info *info, int *capacity)
206{
207 int err;
208 u8 raw;
209
210 err = ds278x_read_reg(info, DS2786_REG_RARC, &raw);
211 if (err)
212 return err;
213 /* Relative capacity is displayed with resolution 0.5 % */
214 *capacity = raw/2 ;
215 return 0;
216}
217
218static int ds278x_get_status(struct ds278x_info *info, int *status)
Ryan Mallonbfdb46c2009-06-18 11:26:26 +1200219{
220 int err;
221 int current_uA;
222 int capacity;
223
Peter Hueweeb9650d2010-05-13 01:54:57 +0200224 err = info->ops->get_battery_current(info, &current_uA);
Ryan Mallonbfdb46c2009-06-18 11:26:26 +1200225 if (err)
226 return err;
227
Peter Hueweeb9650d2010-05-13 01:54:57 +0200228 err = info->ops->get_battery_capacity(info, &capacity);
Ryan Mallonbfdb46c2009-06-18 11:26:26 +1200229 if (err)
230 return err;
231
Evgeny Romanov7cee9ae2013-01-10 12:24:48 +0300232 info->capacity = capacity;
233
Ryan Mallonbfdb46c2009-06-18 11:26:26 +1200234 if (capacity == 100)
235 *status = POWER_SUPPLY_STATUS_FULL;
236 else if (current_uA == 0)
237 *status = POWER_SUPPLY_STATUS_NOT_CHARGING;
238 else if (current_uA < 0)
239 *status = POWER_SUPPLY_STATUS_DISCHARGING;
240 else
241 *status = POWER_SUPPLY_STATUS_CHARGING;
242
243 return 0;
244}
245
Yulia Vilensky9b9ade62010-04-26 14:05:25 +0300246static int ds278x_battery_get_property(struct power_supply *psy,
Ryan Mallonbfdb46c2009-06-18 11:26:26 +1200247 enum power_supply_property prop,
248 union power_supply_propval *val)
249{
Yulia Vilensky9b9ade62010-04-26 14:05:25 +0300250 struct ds278x_info *info = to_ds278x_info(psy);
Ryan Mallonbfdb46c2009-06-18 11:26:26 +1200251 int ret;
252
253 switch (prop) {
254 case POWER_SUPPLY_PROP_STATUS:
Yulia Vilensky9b9ade62010-04-26 14:05:25 +0300255 ret = ds278x_get_status(info, &val->intval);
Ryan Mallonbfdb46c2009-06-18 11:26:26 +1200256 break;
257
258 case POWER_SUPPLY_PROP_CAPACITY:
Peter Hueweeb9650d2010-05-13 01:54:57 +0200259 ret = info->ops->get_battery_capacity(info, &val->intval);
Ryan Mallonbfdb46c2009-06-18 11:26:26 +1200260 break;
261
262 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
Peter Hueweeb9650d2010-05-13 01:54:57 +0200263 ret = info->ops->get_battery_voltage(info, &val->intval);
Ryan Mallonbfdb46c2009-06-18 11:26:26 +1200264 break;
265
266 case POWER_SUPPLY_PROP_CURRENT_NOW:
Peter Hueweeb9650d2010-05-13 01:54:57 +0200267 ret = info->ops->get_battery_current(info, &val->intval);
Ryan Mallonbfdb46c2009-06-18 11:26:26 +1200268 break;
269
270 case POWER_SUPPLY_PROP_TEMP:
Yulia Vilensky9b9ade62010-04-26 14:05:25 +0300271 ret = ds278x_get_temp(info, &val->intval);
Ryan Mallonbfdb46c2009-06-18 11:26:26 +1200272 break;
273
274 default:
275 ret = -EINVAL;
276 }
277
278 return ret;
279}
280
Evgeny Romanov7cee9ae2013-01-10 12:24:48 +0300281static void ds278x_bat_update(struct ds278x_info *info)
282{
283 int old_status = info->status;
284 int old_capacity = info->capacity;
285
286 ds278x_get_status(info, &info->status);
287
288 if ((old_status != info->status) || (old_capacity != info->capacity))
Krzysztof Kozlowski297d7162015-03-12 08:44:11 +0100289 power_supply_changed(info->battery);
Evgeny Romanov7cee9ae2013-01-10 12:24:48 +0300290}
291
292static void ds278x_bat_work(struct work_struct *work)
293{
294 struct ds278x_info *info;
295
296 info = container_of(work, struct ds278x_info, bat_work.work);
297 ds278x_bat_update(info);
298
299 schedule_delayed_work(&info->bat_work, DS278x_DELAY);
300}
301
Yulia Vilensky9b9ade62010-04-26 14:05:25 +0300302static enum power_supply_property ds278x_battery_props[] = {
Ryan Mallonbfdb46c2009-06-18 11:26:26 +1200303 POWER_SUPPLY_PROP_STATUS,
304 POWER_SUPPLY_PROP_CAPACITY,
305 POWER_SUPPLY_PROP_VOLTAGE_NOW,
306 POWER_SUPPLY_PROP_CURRENT_NOW,
307 POWER_SUPPLY_PROP_TEMP,
308};
309
Krzysztof Kozlowski297d7162015-03-12 08:44:11 +0100310static void ds278x_power_supply_init(struct power_supply_desc *battery)
Ryan Mallonbfdb46c2009-06-18 11:26:26 +1200311{
312 battery->type = POWER_SUPPLY_TYPE_BATTERY;
Yulia Vilensky9b9ade62010-04-26 14:05:25 +0300313 battery->properties = ds278x_battery_props;
314 battery->num_properties = ARRAY_SIZE(ds278x_battery_props);
315 battery->get_property = ds278x_battery_get_property;
Ryan Mallonbfdb46c2009-06-18 11:26:26 +1200316 battery->external_power_changed = NULL;
317}
318
Yulia Vilensky9b9ade62010-04-26 14:05:25 +0300319static int ds278x_battery_remove(struct i2c_client *client)
Ryan Mallonbfdb46c2009-06-18 11:26:26 +1200320{
Yulia Vilensky9b9ade62010-04-26 14:05:25 +0300321 struct ds278x_info *info = i2c_get_clientdata(client);
Ryan Mallonbfdb46c2009-06-18 11:26:26 +1200322
Krzysztof Kozlowski297d7162015-03-12 08:44:11 +0100323 power_supply_unregister(info->battery);
324 kfree(info->battery_desc.name);
Ryan Mallonbfdb46c2009-06-18 11:26:26 +1200325
326 mutex_lock(&battery_lock);
327 idr_remove(&battery_id, info->id);
328 mutex_unlock(&battery_lock);
329
Evgeny Romanov7cee9ae2013-01-10 12:24:48 +0300330 cancel_delayed_work(&info->bat_work);
331
Ryan Mallonbfdb46c2009-06-18 11:26:26 +1200332 kfree(info);
333 return 0;
334}
335
Lars-Peter Clausencc6616f2013-03-10 14:34:05 +0100336#ifdef CONFIG_PM_SLEEP
Evgeny Romanov7cee9ae2013-01-10 12:24:48 +0300337
Lars-Peter Clausencc6616f2013-03-10 14:34:05 +0100338static int ds278x_suspend(struct device *dev)
Evgeny Romanov7cee9ae2013-01-10 12:24:48 +0300339{
Lars-Peter Clausencc6616f2013-03-10 14:34:05 +0100340 struct i2c_client *client = to_i2c_client(dev);
Evgeny Romanov7cee9ae2013-01-10 12:24:48 +0300341 struct ds278x_info *info = i2c_get_clientdata(client);
342
343 cancel_delayed_work(&info->bat_work);
344 return 0;
345}
346
Lars-Peter Clausencc6616f2013-03-10 14:34:05 +0100347static int ds278x_resume(struct device *dev)
Evgeny Romanov7cee9ae2013-01-10 12:24:48 +0300348{
Lars-Peter Clausencc6616f2013-03-10 14:34:05 +0100349 struct i2c_client *client = to_i2c_client(dev);
Evgeny Romanov7cee9ae2013-01-10 12:24:48 +0300350 struct ds278x_info *info = i2c_get_clientdata(client);
351
352 schedule_delayed_work(&info->bat_work, DS278x_DELAY);
353 return 0;
354}
Fabio Estevam99a79562014-10-09 19:50:26 -0300355#endif /* CONFIG_PM_SLEEP */
Evgeny Romanov7cee9ae2013-01-10 12:24:48 +0300356
Lars-Peter Clausencc6616f2013-03-10 14:34:05 +0100357static SIMPLE_DEV_PM_OPS(ds278x_battery_pm_ops, ds278x_suspend, ds278x_resume);
Evgeny Romanov7cee9ae2013-01-10 12:24:48 +0300358
Anton Vorontsovab6cc8f2010-04-26 22:10:52 +0400359enum ds278x_num_id {
360 DS2782 = 0,
361 DS2786,
362};
363
Yulia Vilensky9b9ade62010-04-26 14:05:25 +0300364static struct ds278x_battery_ops ds278x_ops[] = {
Anton Vorontsovab6cc8f2010-04-26 22:10:52 +0400365 [DS2782] = {
Peter Hueweeb9650d2010-05-13 01:54:57 +0200366 .get_battery_current = ds2782_get_current,
367 .get_battery_voltage = ds2782_get_voltage,
368 .get_battery_capacity = ds2782_get_capacity,
Yulia Vilensky9b9ade62010-04-26 14:05:25 +0300369 },
Anton Vorontsovab6cc8f2010-04-26 22:10:52 +0400370 [DS2786] = {
Peter Hueweeb9650d2010-05-13 01:54:57 +0200371 .get_battery_current = ds2786_get_current,
372 .get_battery_voltage = ds2786_get_voltage,
373 .get_battery_capacity = ds2786_get_capacity,
Yulia Vilensky9b9ade62010-04-26 14:05:25 +0300374 }
375};
376
377static int ds278x_battery_probe(struct i2c_client *client,
Ryan Mallonbfdb46c2009-06-18 11:26:26 +1200378 const struct i2c_device_id *id)
379{
Yulia Vilensky9b9ade62010-04-26 14:05:25 +0300380 struct ds278x_platform_data *pdata = client->dev.platform_data;
Krzysztof Kozlowski297d7162015-03-12 08:44:11 +0100381 struct power_supply_config psy_cfg = {};
Yulia Vilensky9b9ade62010-04-26 14:05:25 +0300382 struct ds278x_info *info;
Ryan Mallonbfdb46c2009-06-18 11:26:26 +1200383 int ret;
384 int num;
385
Yulia Vilensky9b9ade62010-04-26 14:05:25 +0300386 /*
387 * ds2786 should have the sense resistor value set
388 * in the platform data
389 */
Anton Vorontsovab6cc8f2010-04-26 22:10:52 +0400390 if (id->driver_data == DS2786 && !pdata) {
Yulia Vilensky9b9ade62010-04-26 14:05:25 +0300391 dev_err(&client->dev, "missing platform data for ds2786\n");
392 return -EINVAL;
393 }
394
Ryan Mallonbfdb46c2009-06-18 11:26:26 +1200395 /* Get an ID for this battery */
Ryan Mallonbfdb46c2009-06-18 11:26:26 +1200396 mutex_lock(&battery_lock);
Tejun Heo05e2cef2013-02-27 17:04:37 -0800397 ret = idr_alloc(&battery_id, client, 0, 0, GFP_KERNEL);
Ryan Mallonbfdb46c2009-06-18 11:26:26 +1200398 mutex_unlock(&battery_lock);
399 if (ret < 0)
400 goto fail_id;
Tejun Heo05e2cef2013-02-27 17:04:37 -0800401 num = ret;
Ryan Mallonbfdb46c2009-06-18 11:26:26 +1200402
403 info = kzalloc(sizeof(*info), GFP_KERNEL);
404 if (!info) {
405 ret = -ENOMEM;
406 goto fail_info;
407 }
408
Krzysztof Kozlowski297d7162015-03-12 08:44:11 +0100409 info->battery_desc.name = kasprintf(GFP_KERNEL, "%s-%d",
410 client->name, num);
411 if (!info->battery_desc.name) {
Ryan Mallonbfdb46c2009-06-18 11:26:26 +1200412 ret = -ENOMEM;
413 goto fail_name;
414 }
415
Anton Vorontsovab6cc8f2010-04-26 22:10:52 +0400416 if (id->driver_data == DS2786)
Yulia Vilensky9b9ade62010-04-26 14:05:25 +0300417 info->rsns = pdata->rsns;
418
Ryan Mallonbfdb46c2009-06-18 11:26:26 +1200419 i2c_set_clientdata(client, info);
420 info->client = client;
Yulia Vilensky9b9ade62010-04-26 14:05:25 +0300421 info->id = num;
422 info->ops = &ds278x_ops[id->driver_data];
Krzysztof Kozlowski297d7162015-03-12 08:44:11 +0100423 ds278x_power_supply_init(&info->battery_desc);
424 psy_cfg.drv_data = info;
Ryan Mallonbfdb46c2009-06-18 11:26:26 +1200425
Evgeny Romanov7cee9ae2013-01-10 12:24:48 +0300426 info->capacity = 100;
427 info->status = POWER_SUPPLY_STATUS_FULL;
428
429 INIT_DELAYED_WORK(&info->bat_work, ds278x_bat_work);
430
Krzysztof Kozlowski297d7162015-03-12 08:44:11 +0100431 info->battery = power_supply_register(&client->dev,
432 &info->battery_desc, &psy_cfg);
433 if (IS_ERR(info->battery)) {
Ryan Mallonbfdb46c2009-06-18 11:26:26 +1200434 dev_err(&client->dev, "failed to register battery\n");
Krzysztof Kozlowski297d7162015-03-12 08:44:11 +0100435 ret = PTR_ERR(info->battery);
Ryan Mallonbfdb46c2009-06-18 11:26:26 +1200436 goto fail_register;
Evgeny Romanov7cee9ae2013-01-10 12:24:48 +0300437 } else {
438 schedule_delayed_work(&info->bat_work, DS278x_DELAY);
Ryan Mallonbfdb46c2009-06-18 11:26:26 +1200439 }
440
441 return 0;
442
443fail_register:
Krzysztof Kozlowski297d7162015-03-12 08:44:11 +0100444 kfree(info->battery_desc.name);
Ryan Mallonbfdb46c2009-06-18 11:26:26 +1200445fail_name:
Ryan Mallonbfdb46c2009-06-18 11:26:26 +1200446 kfree(info);
447fail_info:
448 mutex_lock(&battery_lock);
449 idr_remove(&battery_id, num);
450 mutex_unlock(&battery_lock);
451fail_id:
452 return ret;
453}
454
Yulia Vilensky9b9ade62010-04-26 14:05:25 +0300455static const struct i2c_device_id ds278x_id[] = {
Anton Vorontsovab6cc8f2010-04-26 22:10:52 +0400456 {"ds2782", DS2782},
457 {"ds2786", DS2786},
Ryan Mallonbfdb46c2009-06-18 11:26:26 +1200458 {},
459};
Axel Lin84ab16f2011-03-01 17:23:34 +0800460MODULE_DEVICE_TABLE(i2c, ds278x_id);
Ryan Mallonbfdb46c2009-06-18 11:26:26 +1200461
Yulia Vilensky9b9ade62010-04-26 14:05:25 +0300462static struct i2c_driver ds278x_battery_driver = {
Ryan Mallonbfdb46c2009-06-18 11:26:26 +1200463 .driver = {
464 .name = "ds2782-battery",
Fabio Estevam99a79562014-10-09 19:50:26 -0300465 .pm = &ds278x_battery_pm_ops,
Ryan Mallonbfdb46c2009-06-18 11:26:26 +1200466 },
Yulia Vilensky9b9ade62010-04-26 14:05:25 +0300467 .probe = ds278x_battery_probe,
468 .remove = ds278x_battery_remove,
469 .id_table = ds278x_id,
Ryan Mallonbfdb46c2009-06-18 11:26:26 +1200470};
Axel Lin5ff92e72012-01-21 14:42:54 +0800471module_i2c_driver(ds278x_battery_driver);
Ryan Mallonbfdb46c2009-06-18 11:26:26 +1200472
Ryan Mallon1c5454e2011-06-15 14:45:36 +1000473MODULE_AUTHOR("Ryan Mallon");
Ryan Mallonbfdb46c2009-06-18 11:26:26 +1200474MODULE_DESCRIPTION("Maxim/Dallas DS2782 Stand-Alone Fuel Gauage IC driver");
475MODULE_LICENSE("GPL");