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Rhyland Kleina7640bf2010-09-05 15:31:23 -07001/*
Rhyland Klein3ddca0622011-12-05 17:50:46 -08002 * Gas Gauge driver for SBS Compliant Batteries
Rhyland Kleina7640bf2010-09-05 15:31:23 -07003 *
4 * Copyright (c) 2010, NVIDIA Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * more details.
15 *
16 * You should have received a copy of the GNU General Public License along
17 * with this program; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
19 */
20
21#include <linux/init.h>
22#include <linux/module.h>
23#include <linux/kernel.h>
24#include <linux/err.h>
25#include <linux/power_supply.h>
26#include <linux/i2c.h>
27#include <linux/slab.h>
Rhyland Kleinbb879102011-02-28 16:55:28 -080028#include <linux/interrupt.h>
29#include <linux/gpio.h>
Sachin Kamat075ed032013-03-14 15:49:46 +053030#include <linux/of.h>
Rhyland Kleinbb879102011-02-28 16:55:28 -080031
Rhyland Klein3ddca0622011-12-05 17:50:46 -080032#include <linux/power/sbs-battery.h>
Rhyland Kleina7640bf2010-09-05 15:31:23 -070033
34enum {
35 REG_MANUFACTURER_DATA,
36 REG_TEMPERATURE,
37 REG_VOLTAGE,
38 REG_CURRENT,
39 REG_CAPACITY,
40 REG_TIME_TO_EMPTY,
41 REG_TIME_TO_FULL,
42 REG_STATUS,
43 REG_CYCLE_COUNT,
Rhyland Kleind3ab61e2010-09-21 15:33:55 -070044 REG_SERIAL_NUMBER,
45 REG_REMAINING_CAPACITY,
Rhyland Klein51d07562011-01-25 11:10:06 -080046 REG_REMAINING_CAPACITY_CHARGE,
Rhyland Kleind3ab61e2010-09-21 15:33:55 -070047 REG_FULL_CHARGE_CAPACITY,
Rhyland Klein51d07562011-01-25 11:10:06 -080048 REG_FULL_CHARGE_CAPACITY_CHARGE,
Rhyland Kleind3ab61e2010-09-21 15:33:55 -070049 REG_DESIGN_CAPACITY,
Rhyland Klein51d07562011-01-25 11:10:06 -080050 REG_DESIGN_CAPACITY_CHARGE,
Rhyland Kleind3ab61e2010-09-21 15:33:55 -070051 REG_DESIGN_VOLTAGE,
Rhyland Kleina7640bf2010-09-05 15:31:23 -070052};
53
Rhyland Klein51d07562011-01-25 11:10:06 -080054/* Battery Mode defines */
55#define BATTERY_MODE_OFFSET 0x03
56#define BATTERY_MODE_MASK 0x8000
Rhyland Klein3ddca0622011-12-05 17:50:46 -080057enum sbs_battery_mode {
Rhyland Klein51d07562011-01-25 11:10:06 -080058 BATTERY_MODE_AMPS,
59 BATTERY_MODE_WATTS
60};
61
Rhyland Kleina7640bf2010-09-05 15:31:23 -070062/* manufacturer access defines */
63#define MANUFACTURER_ACCESS_STATUS 0x0006
64#define MANUFACTURER_ACCESS_SLEEP 0x0011
65
66/* battery status value bits */
Rhyland Kleind3ab61e2010-09-21 15:33:55 -070067#define BATTERY_DISCHARGING 0x40
Rhyland Kleina7640bf2010-09-05 15:31:23 -070068#define BATTERY_FULL_CHARGED 0x20
69#define BATTERY_FULL_DISCHARGED 0x10
70
Rhyland Klein3ddca0622011-12-05 17:50:46 -080071#define SBS_DATA(_psp, _addr, _min_value, _max_value) { \
Rhyland Kleina7640bf2010-09-05 15:31:23 -070072 .psp = _psp, \
73 .addr = _addr, \
74 .min_value = _min_value, \
75 .max_value = _max_value, \
76}
77
Rhyland Klein3ddca0622011-12-05 17:50:46 -080078static const struct chip_data {
Rhyland Kleina7640bf2010-09-05 15:31:23 -070079 enum power_supply_property psp;
80 u8 addr;
81 int min_value;
82 int max_value;
Rhyland Klein3ddca0622011-12-05 17:50:46 -080083} sbs_data[] = {
Rhyland Kleina7640bf2010-09-05 15:31:23 -070084 [REG_MANUFACTURER_DATA] =
Rhyland Klein3ddca0622011-12-05 17:50:46 -080085 SBS_DATA(POWER_SUPPLY_PROP_PRESENT, 0x00, 0, 65535),
Rhyland Kleina7640bf2010-09-05 15:31:23 -070086 [REG_TEMPERATURE] =
Rhyland Klein3ddca0622011-12-05 17:50:46 -080087 SBS_DATA(POWER_SUPPLY_PROP_TEMP, 0x08, 0, 65535),
Rhyland Kleina7640bf2010-09-05 15:31:23 -070088 [REG_VOLTAGE] =
Rhyland Klein3ddca0622011-12-05 17:50:46 -080089 SBS_DATA(POWER_SUPPLY_PROP_VOLTAGE_NOW, 0x09, 0, 20000),
Rhyland Kleina7640bf2010-09-05 15:31:23 -070090 [REG_CURRENT] =
Rhyland Klein3ddca0622011-12-05 17:50:46 -080091 SBS_DATA(POWER_SUPPLY_PROP_CURRENT_NOW, 0x0A, -32768, 32767),
Rhyland Kleina7640bf2010-09-05 15:31:23 -070092 [REG_CAPACITY] =
Nikolaus Vossb1f092f2012-04-25 08:59:03 +020093 SBS_DATA(POWER_SUPPLY_PROP_CAPACITY, 0x0D, 0, 100),
Rhyland Kleind3ab61e2010-09-21 15:33:55 -070094 [REG_REMAINING_CAPACITY] =
Rhyland Klein3ddca0622011-12-05 17:50:46 -080095 SBS_DATA(POWER_SUPPLY_PROP_ENERGY_NOW, 0x0F, 0, 65535),
Rhyland Klein51d07562011-01-25 11:10:06 -080096 [REG_REMAINING_CAPACITY_CHARGE] =
Rhyland Klein3ddca0622011-12-05 17:50:46 -080097 SBS_DATA(POWER_SUPPLY_PROP_CHARGE_NOW, 0x0F, 0, 65535),
Rhyland Kleind3ab61e2010-09-21 15:33:55 -070098 [REG_FULL_CHARGE_CAPACITY] =
Rhyland Klein3ddca0622011-12-05 17:50:46 -080099 SBS_DATA(POWER_SUPPLY_PROP_ENERGY_FULL, 0x10, 0, 65535),
Rhyland Klein51d07562011-01-25 11:10:06 -0800100 [REG_FULL_CHARGE_CAPACITY_CHARGE] =
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800101 SBS_DATA(POWER_SUPPLY_PROP_CHARGE_FULL, 0x10, 0, 65535),
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700102 [REG_TIME_TO_EMPTY] =
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800103 SBS_DATA(POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG, 0x12, 0, 65535),
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700104 [REG_TIME_TO_FULL] =
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800105 SBS_DATA(POWER_SUPPLY_PROP_TIME_TO_FULL_AVG, 0x13, 0, 65535),
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700106 [REG_STATUS] =
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800107 SBS_DATA(POWER_SUPPLY_PROP_STATUS, 0x16, 0, 65535),
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700108 [REG_CYCLE_COUNT] =
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800109 SBS_DATA(POWER_SUPPLY_PROP_CYCLE_COUNT, 0x17, 0, 65535),
Rhyland Kleind3ab61e2010-09-21 15:33:55 -0700110 [REG_DESIGN_CAPACITY] =
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800111 SBS_DATA(POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN, 0x18, 0, 65535),
Rhyland Klein51d07562011-01-25 11:10:06 -0800112 [REG_DESIGN_CAPACITY_CHARGE] =
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800113 SBS_DATA(POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 0x18, 0, 65535),
Rhyland Kleind3ab61e2010-09-21 15:33:55 -0700114 [REG_DESIGN_VOLTAGE] =
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800115 SBS_DATA(POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, 0x19, 0, 65535),
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700116 [REG_SERIAL_NUMBER] =
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800117 SBS_DATA(POWER_SUPPLY_PROP_SERIAL_NUMBER, 0x1C, 0, 65535),
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700118};
119
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800120static enum power_supply_property sbs_properties[] = {
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700121 POWER_SUPPLY_PROP_STATUS,
122 POWER_SUPPLY_PROP_HEALTH,
123 POWER_SUPPLY_PROP_PRESENT,
124 POWER_SUPPLY_PROP_TECHNOLOGY,
125 POWER_SUPPLY_PROP_CYCLE_COUNT,
126 POWER_SUPPLY_PROP_VOLTAGE_NOW,
127 POWER_SUPPLY_PROP_CURRENT_NOW,
128 POWER_SUPPLY_PROP_CAPACITY,
129 POWER_SUPPLY_PROP_TEMP,
130 POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
131 POWER_SUPPLY_PROP_TIME_TO_FULL_AVG,
132 POWER_SUPPLY_PROP_SERIAL_NUMBER,
Rhyland Kleind3ab61e2010-09-21 15:33:55 -0700133 POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
134 POWER_SUPPLY_PROP_ENERGY_NOW,
135 POWER_SUPPLY_PROP_ENERGY_FULL,
136 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
Rhyland Klein51d07562011-01-25 11:10:06 -0800137 POWER_SUPPLY_PROP_CHARGE_NOW,
138 POWER_SUPPLY_PROP_CHARGE_FULL,
139 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700140};
141
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800142struct sbs_info {
Rhyland Kleinbb879102011-02-28 16:55:28 -0800143 struct i2c_client *client;
144 struct power_supply power_supply;
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800145 struct sbs_platform_data *pdata;
Rhyland Kleinbb879102011-02-28 16:55:28 -0800146 bool is_present;
147 bool gpio_detect;
148 bool enable_detection;
149 int irq;
Rhyland Klein58ddafa2011-05-24 12:05:59 -0700150 int last_state;
151 int poll_time;
152 struct delayed_work work;
153 int ignore_changes;
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700154};
155
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800156static int sbs_read_word_data(struct i2c_client *client, u8 address)
Rhyland Kleind3ab61e2010-09-21 15:33:55 -0700157{
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800158 struct sbs_info *chip = i2c_get_clientdata(client);
Rhyland Kleinff28fce2011-02-28 16:55:29 -0800159 s32 ret = 0;
160 int retries = 1;
Rhyland Kleind3ab61e2010-09-21 15:33:55 -0700161
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800162 if (chip->pdata)
163 retries = max(chip->pdata->i2c_retry_count + 1, 1);
Rhyland Kleinff28fce2011-02-28 16:55:29 -0800164
165 while (retries > 0) {
166 ret = i2c_smbus_read_word_data(client, address);
167 if (ret >= 0)
168 break;
169 retries--;
170 }
171
Rhyland Kleind3ab61e2010-09-21 15:33:55 -0700172 if (ret < 0) {
Rhyland Kleina7d9ace2011-03-09 16:18:02 -0800173 dev_dbg(&client->dev,
Rhyland Kleind3ab61e2010-09-21 15:33:55 -0700174 "%s: i2c read at address 0x%x failed\n",
175 __func__, address);
176 return ret;
177 }
Rhyland Kleinff28fce2011-02-28 16:55:29 -0800178
Rhyland Kleind3ab61e2010-09-21 15:33:55 -0700179 return le16_to_cpu(ret);
180}
181
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800182static int sbs_write_word_data(struct i2c_client *client, u8 address,
Rhyland Kleind3ab61e2010-09-21 15:33:55 -0700183 u16 value)
184{
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800185 struct sbs_info *chip = i2c_get_clientdata(client);
Rhyland Kleinff28fce2011-02-28 16:55:29 -0800186 s32 ret = 0;
187 int retries = 1;
Rhyland Kleind3ab61e2010-09-21 15:33:55 -0700188
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800189 if (chip->pdata)
190 retries = max(chip->pdata->i2c_retry_count + 1, 1);
Rhyland Kleinff28fce2011-02-28 16:55:29 -0800191
192 while (retries > 0) {
193 ret = i2c_smbus_write_word_data(client, address,
194 le16_to_cpu(value));
195 if (ret >= 0)
196 break;
197 retries--;
198 }
199
Rhyland Kleind3ab61e2010-09-21 15:33:55 -0700200 if (ret < 0) {
Rhyland Kleina7d9ace2011-03-09 16:18:02 -0800201 dev_dbg(&client->dev,
Rhyland Kleind3ab61e2010-09-21 15:33:55 -0700202 "%s: i2c write to address 0x%x failed\n",
203 __func__, address);
204 return ret;
205 }
Rhyland Kleinff28fce2011-02-28 16:55:29 -0800206
Rhyland Kleind3ab61e2010-09-21 15:33:55 -0700207 return 0;
208}
209
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800210static int sbs_get_battery_presence_and_health(
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700211 struct i2c_client *client, enum power_supply_property psp,
212 union power_supply_propval *val)
213{
214 s32 ret;
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800215 struct sbs_info *chip = i2c_get_clientdata(client);
Rhyland Kleinbb879102011-02-28 16:55:28 -0800216
217 if (psp == POWER_SUPPLY_PROP_PRESENT &&
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800218 chip->gpio_detect) {
219 ret = gpio_get_value(chip->pdata->battery_detect);
220 if (ret == chip->pdata->battery_detect_present)
Rhyland Kleinbb879102011-02-28 16:55:28 -0800221 val->intval = 1;
222 else
223 val->intval = 0;
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800224 chip->is_present = val->intval;
Rhyland Kleinbb879102011-02-28 16:55:28 -0800225 return ret;
226 }
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700227
228 /* Write to ManufacturerAccess with
229 * ManufacturerAccess command and then
230 * read the status */
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800231 ret = sbs_write_word_data(client, sbs_data[REG_MANUFACTURER_DATA].addr,
232 MANUFACTURER_ACCESS_STATUS);
Rhyland Kleinbb879102011-02-28 16:55:28 -0800233 if (ret < 0) {
234 if (psp == POWER_SUPPLY_PROP_PRESENT)
235 val->intval = 0; /* battery removed */
Rhyland Kleind3ab61e2010-09-21 15:33:55 -0700236 return ret;
Rhyland Kleinbb879102011-02-28 16:55:28 -0800237 }
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700238
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800239 ret = sbs_read_word_data(client, sbs_data[REG_MANUFACTURER_DATA].addr);
Rhyland Kleina7d9ace2011-03-09 16:18:02 -0800240 if (ret < 0)
241 return ret;
242
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800243 if (ret < sbs_data[REG_MANUFACTURER_DATA].min_value ||
244 ret > sbs_data[REG_MANUFACTURER_DATA].max_value) {
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700245 val->intval = 0;
246 return 0;
247 }
248
249 /* Mask the upper nibble of 2nd byte and
250 * lower byte of response then
251 * shift the result by 8 to get status*/
252 ret &= 0x0F00;
253 ret >>= 8;
254 if (psp == POWER_SUPPLY_PROP_PRESENT) {
255 if (ret == 0x0F)
256 /* battery removed */
257 val->intval = 0;
258 else
259 val->intval = 1;
260 } else if (psp == POWER_SUPPLY_PROP_HEALTH) {
261 if (ret == 0x09)
262 val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
263 else if (ret == 0x0B)
264 val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
265 else if (ret == 0x0C)
266 val->intval = POWER_SUPPLY_HEALTH_DEAD;
267 else
268 val->intval = POWER_SUPPLY_HEALTH_GOOD;
269 }
270
271 return 0;
272}
273
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800274static int sbs_get_battery_property(struct i2c_client *client,
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700275 int reg_offset, enum power_supply_property psp,
276 union power_supply_propval *val)
277{
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800278 struct sbs_info *chip = i2c_get_clientdata(client);
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700279 s32 ret;
280
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800281 ret = sbs_read_word_data(client, sbs_data[reg_offset].addr);
Rhyland Kleind3ab61e2010-09-21 15:33:55 -0700282 if (ret < 0)
283 return ret;
284
285 /* returned values are 16 bit */
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800286 if (sbs_data[reg_offset].min_value < 0)
Rhyland Kleind3ab61e2010-09-21 15:33:55 -0700287 ret = (s16)ret;
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700288
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800289 if (ret >= sbs_data[reg_offset].min_value &&
290 ret <= sbs_data[reg_offset].max_value) {
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700291 val->intval = ret;
Rhyland Klein58ddafa2011-05-24 12:05:59 -0700292 if (psp != POWER_SUPPLY_PROP_STATUS)
293 return 0;
294
295 if (ret & BATTERY_FULL_CHARGED)
296 val->intval = POWER_SUPPLY_STATUS_FULL;
297 else if (ret & BATTERY_FULL_DISCHARGED)
298 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
299 else if (ret & BATTERY_DISCHARGING)
300 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
301 else
302 val->intval = POWER_SUPPLY_STATUS_CHARGING;
303
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800304 if (chip->poll_time == 0)
305 chip->last_state = val->intval;
306 else if (chip->last_state != val->intval) {
307 cancel_delayed_work_sync(&chip->work);
308 power_supply_changed(&chip->power_supply);
309 chip->poll_time = 0;
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700310 }
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700311 } else {
312 if (psp == POWER_SUPPLY_PROP_STATUS)
313 val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
314 else
315 val->intval = 0;
316 }
317
318 return 0;
319}
320
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800321static void sbs_unit_adjustment(struct i2c_client *client,
Rhyland Kleind3ab61e2010-09-21 15:33:55 -0700322 enum power_supply_property psp, union power_supply_propval *val)
323{
324#define BASE_UNIT_CONVERSION 1000
325#define BATTERY_MODE_CAP_MULT_WATT (10 * BASE_UNIT_CONVERSION)
Benson Leung909a78b2011-02-27 17:41:48 -0800326#define TIME_UNIT_CONVERSION 60
327#define TEMP_KELVIN_TO_CELSIUS 2731
Rhyland Kleind3ab61e2010-09-21 15:33:55 -0700328 switch (psp) {
329 case POWER_SUPPLY_PROP_ENERGY_NOW:
330 case POWER_SUPPLY_PROP_ENERGY_FULL:
331 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800332 /* sbs provides energy in units of 10mWh.
Benson Leung909a78b2011-02-27 17:41:48 -0800333 * Convert to µWh
334 */
Rhyland Kleind3ab61e2010-09-21 15:33:55 -0700335 val->intval *= BATTERY_MODE_CAP_MULT_WATT;
336 break;
337
338 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
339 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
340 case POWER_SUPPLY_PROP_CURRENT_NOW:
Rhyland Klein51d07562011-01-25 11:10:06 -0800341 case POWER_SUPPLY_PROP_CHARGE_NOW:
342 case POWER_SUPPLY_PROP_CHARGE_FULL:
343 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
Rhyland Kleind3ab61e2010-09-21 15:33:55 -0700344 val->intval *= BASE_UNIT_CONVERSION;
345 break;
346
347 case POWER_SUPPLY_PROP_TEMP:
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800348 /* sbs provides battery temperature in 0.1K
Benson Leung909a78b2011-02-27 17:41:48 -0800349 * so convert it to 0.1°C
350 */
351 val->intval -= TEMP_KELVIN_TO_CELSIUS;
Rhyland Kleind3ab61e2010-09-21 15:33:55 -0700352 break;
353
354 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
355 case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG:
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800356 /* sbs provides time to empty and time to full in minutes.
Benson Leung909a78b2011-02-27 17:41:48 -0800357 * Convert to seconds
358 */
Rhyland Kleind3ab61e2010-09-21 15:33:55 -0700359 val->intval *= TIME_UNIT_CONVERSION;
360 break;
361
362 default:
363 dev_dbg(&client->dev,
364 "%s: no need for unit conversion %d\n", __func__, psp);
365 }
366}
367
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800368static enum sbs_battery_mode sbs_set_battery_mode(struct i2c_client *client,
369 enum sbs_battery_mode mode)
Rhyland Klein51d07562011-01-25 11:10:06 -0800370{
371 int ret, original_val;
372
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800373 original_val = sbs_read_word_data(client, BATTERY_MODE_OFFSET);
Rhyland Klein51d07562011-01-25 11:10:06 -0800374 if (original_val < 0)
375 return original_val;
376
377 if ((original_val & BATTERY_MODE_MASK) == mode)
378 return mode;
379
380 if (mode == BATTERY_MODE_AMPS)
381 ret = original_val & ~BATTERY_MODE_MASK;
382 else
383 ret = original_val | BATTERY_MODE_MASK;
384
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800385 ret = sbs_write_word_data(client, BATTERY_MODE_OFFSET, ret);
Rhyland Klein51d07562011-01-25 11:10:06 -0800386 if (ret < 0)
387 return ret;
388
389 return original_val & BATTERY_MODE_MASK;
390}
391
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800392static int sbs_get_battery_capacity(struct i2c_client *client,
Rhyland Kleind3ab61e2010-09-21 15:33:55 -0700393 int reg_offset, enum power_supply_property psp,
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700394 union power_supply_propval *val)
395{
396 s32 ret;
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800397 enum sbs_battery_mode mode = BATTERY_MODE_WATTS;
Rhyland Klein51d07562011-01-25 11:10:06 -0800398
399 if (power_supply_is_amp_property(psp))
400 mode = BATTERY_MODE_AMPS;
401
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800402 mode = sbs_set_battery_mode(client, mode);
Rhyland Klein51d07562011-01-25 11:10:06 -0800403 if (mode < 0)
404 return mode;
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700405
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800406 ret = sbs_read_word_data(client, sbs_data[reg_offset].addr);
Rhyland Kleind3ab61e2010-09-21 15:33:55 -0700407 if (ret < 0)
408 return ret;
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700409
Rhyland Kleind3ab61e2010-09-21 15:33:55 -0700410 if (psp == POWER_SUPPLY_PROP_CAPACITY) {
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800411 /* sbs spec says that this can be >100 %
Rhyland Kleind3ab61e2010-09-21 15:33:55 -0700412 * even if max value is 100 % */
413 val->intval = min(ret, 100);
414 } else
415 val->intval = ret;
416
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800417 ret = sbs_set_battery_mode(client, mode);
Rhyland Klein51d07562011-01-25 11:10:06 -0800418 if (ret < 0)
419 return ret;
420
Rhyland Kleind3ab61e2010-09-21 15:33:55 -0700421 return 0;
422}
423
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800424static char sbs_serial[5];
425static int sbs_get_battery_serial_number(struct i2c_client *client,
Rhyland Kleind3ab61e2010-09-21 15:33:55 -0700426 union power_supply_propval *val)
427{
428 int ret;
429
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800430 ret = sbs_read_word_data(client, sbs_data[REG_SERIAL_NUMBER].addr);
Rhyland Kleind3ab61e2010-09-21 15:33:55 -0700431 if (ret < 0)
432 return ret;
433
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800434 ret = sprintf(sbs_serial, "%04x", ret);
435 val->strval = sbs_serial;
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700436
437 return 0;
438}
439
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800440static int sbs_get_property_index(struct i2c_client *client,
Rhyland Klein51d07562011-01-25 11:10:06 -0800441 enum power_supply_property psp)
442{
443 int count;
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800444 for (count = 0; count < ARRAY_SIZE(sbs_data); count++)
445 if (psp == sbs_data[count].psp)
Rhyland Klein51d07562011-01-25 11:10:06 -0800446 return count;
447
448 dev_warn(&client->dev,
449 "%s: Invalid Property - %d\n", __func__, psp);
450
451 return -EINVAL;
452}
453
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800454static int sbs_get_property(struct power_supply *psy,
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700455 enum power_supply_property psp,
456 union power_supply_propval *val)
457{
Rhyland Kleinbb879102011-02-28 16:55:28 -0800458 int ret = 0;
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800459 struct sbs_info *chip = container_of(psy,
460 struct sbs_info, power_supply);
461 struct i2c_client *client = chip->client;
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700462
463 switch (psp) {
464 case POWER_SUPPLY_PROP_PRESENT:
465 case POWER_SUPPLY_PROP_HEALTH:
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800466 ret = sbs_get_battery_presence_and_health(client, psp, val);
Rhyland Kleina7d9ace2011-03-09 16:18:02 -0800467 if (psp == POWER_SUPPLY_PROP_PRESENT)
468 return 0;
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700469 break;
470
471 case POWER_SUPPLY_PROP_TECHNOLOGY:
472 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
Nikolaus Voss5da50982012-05-09 08:30:44 +0200473 goto done; /* don't trigger power_supply_changed()! */
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700474
Rhyland Kleind3ab61e2010-09-21 15:33:55 -0700475 case POWER_SUPPLY_PROP_ENERGY_NOW:
476 case POWER_SUPPLY_PROP_ENERGY_FULL:
477 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
Rhyland Klein51d07562011-01-25 11:10:06 -0800478 case POWER_SUPPLY_PROP_CHARGE_NOW:
479 case POWER_SUPPLY_PROP_CHARGE_FULL:
480 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700481 case POWER_SUPPLY_PROP_CAPACITY:
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800482 ret = sbs_get_property_index(client, psp);
Rhyland Kleinbb879102011-02-28 16:55:28 -0800483 if (ret < 0)
484 break;
Rhyland Kleind3ab61e2010-09-21 15:33:55 -0700485
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800486 ret = sbs_get_battery_capacity(client, ret, psp, val);
Rhyland Kleind3ab61e2010-09-21 15:33:55 -0700487 break;
488
489 case POWER_SUPPLY_PROP_SERIAL_NUMBER:
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800490 ret = sbs_get_battery_serial_number(client, val);
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700491 break;
492
493 case POWER_SUPPLY_PROP_STATUS:
494 case POWER_SUPPLY_PROP_CYCLE_COUNT:
495 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
496 case POWER_SUPPLY_PROP_CURRENT_NOW:
497 case POWER_SUPPLY_PROP_TEMP:
498 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
499 case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG:
Rhyland Kleind3ab61e2010-09-21 15:33:55 -0700500 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800501 ret = sbs_get_property_index(client, psp);
Rhyland Kleinbb879102011-02-28 16:55:28 -0800502 if (ret < 0)
503 break;
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700504
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800505 ret = sbs_get_battery_property(client, ret, psp, val);
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700506 break;
507
508 default:
509 dev_err(&client->dev,
510 "%s: INVALID property\n", __func__);
511 return -EINVAL;
512 }
513
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800514 if (!chip->enable_detection)
Rhyland Kleinbb879102011-02-28 16:55:28 -0800515 goto done;
516
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800517 if (!chip->gpio_detect &&
518 chip->is_present != (ret >= 0)) {
519 chip->is_present = (ret >= 0);
520 power_supply_changed(&chip->power_supply);
Rhyland Kleinbb879102011-02-28 16:55:28 -0800521 }
522
523done:
524 if (!ret) {
525 /* Convert units to match requirements for power supply class */
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800526 sbs_unit_adjustment(client, psp, val);
Rhyland Kleinbb879102011-02-28 16:55:28 -0800527 }
Rhyland Kleind3ab61e2010-09-21 15:33:55 -0700528
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700529 dev_dbg(&client->dev,
Rhyland Kleina7d9ace2011-03-09 16:18:02 -0800530 "%s: property = %d, value = %x\n", __func__, psp, val->intval);
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700531
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800532 if (ret && chip->is_present)
Rhyland Kleina7d9ace2011-03-09 16:18:02 -0800533 return ret;
534
535 /* battery not present, so return NODATA for properties */
536 if (ret)
537 return -ENODATA;
538
539 return 0;
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700540}
541
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800542static irqreturn_t sbs_irq(int irq, void *devid)
Rhyland Kleinbb879102011-02-28 16:55:28 -0800543{
544 struct power_supply *battery = devid;
545
546 power_supply_changed(battery);
547
548 return IRQ_HANDLED;
549}
550
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800551static void sbs_external_power_changed(struct power_supply *psy)
Rhyland Klein58ddafa2011-05-24 12:05:59 -0700552{
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800553 struct sbs_info *chip;
Rhyland Klein58ddafa2011-05-24 12:05:59 -0700554
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800555 chip = container_of(psy, struct sbs_info, power_supply);
Rhyland Klein58ddafa2011-05-24 12:05:59 -0700556
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800557 if (chip->ignore_changes > 0) {
558 chip->ignore_changes--;
Rhyland Klein58ddafa2011-05-24 12:05:59 -0700559 return;
560 }
561
562 /* cancel outstanding work */
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800563 cancel_delayed_work_sync(&chip->work);
Rhyland Klein58ddafa2011-05-24 12:05:59 -0700564
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800565 schedule_delayed_work(&chip->work, HZ);
566 chip->poll_time = chip->pdata->poll_retry_count;
Rhyland Klein58ddafa2011-05-24 12:05:59 -0700567}
568
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800569static void sbs_delayed_work(struct work_struct *work)
Rhyland Klein58ddafa2011-05-24 12:05:59 -0700570{
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800571 struct sbs_info *chip;
Rhyland Klein58ddafa2011-05-24 12:05:59 -0700572 s32 ret;
573
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800574 chip = container_of(work, struct sbs_info, work.work);
Rhyland Klein58ddafa2011-05-24 12:05:59 -0700575
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800576 ret = sbs_read_word_data(chip->client, sbs_data[REG_STATUS].addr);
Rhyland Klein58ddafa2011-05-24 12:05:59 -0700577 /* if the read failed, give up on this work */
578 if (ret < 0) {
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800579 chip->poll_time = 0;
Rhyland Klein58ddafa2011-05-24 12:05:59 -0700580 return;
581 }
582
583 if (ret & BATTERY_FULL_CHARGED)
584 ret = POWER_SUPPLY_STATUS_FULL;
585 else if (ret & BATTERY_FULL_DISCHARGED)
586 ret = POWER_SUPPLY_STATUS_NOT_CHARGING;
587 else if (ret & BATTERY_DISCHARGING)
588 ret = POWER_SUPPLY_STATUS_DISCHARGING;
589 else
590 ret = POWER_SUPPLY_STATUS_CHARGING;
591
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800592 if (chip->last_state != ret) {
593 chip->poll_time = 0;
594 power_supply_changed(&chip->power_supply);
Rhyland Klein58ddafa2011-05-24 12:05:59 -0700595 return;
596 }
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800597 if (chip->poll_time > 0) {
598 schedule_delayed_work(&chip->work, HZ);
599 chip->poll_time--;
Rhyland Klein58ddafa2011-05-24 12:05:59 -0700600 return;
601 }
602}
603
Rhyland Klein6c75ea12011-09-14 13:19:07 -0700604#if defined(CONFIG_OF)
605
606#include <linux/of_device.h>
607#include <linux/of_gpio.h>
608
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800609static const struct of_device_id sbs_dt_ids[] = {
610 { .compatible = "sbs,sbs-battery" },
Rhyland Klein6c75ea12011-09-14 13:19:07 -0700611 { .compatible = "ti,bq20z75" },
612 { }
613};
Olof Johansson62df3932012-01-06 05:45:34 +0400614MODULE_DEVICE_TABLE(of, sbs_dt_ids);
Rhyland Klein6c75ea12011-09-14 13:19:07 -0700615
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800616static struct sbs_platform_data *sbs_of_populate_pdata(
Rhyland Klein6c75ea12011-09-14 13:19:07 -0700617 struct i2c_client *client)
618{
619 struct device_node *of_node = client->dev.of_node;
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800620 struct sbs_platform_data *pdata = client->dev.platform_data;
Rhyland Klein6c75ea12011-09-14 13:19:07 -0700621 enum of_gpio_flags gpio_flags;
622 int rc;
623 u32 prop;
624
625 /* verify this driver matches this device */
626 if (!of_node)
627 return NULL;
628
629 /* if platform data is set, honor it */
630 if (pdata)
631 return pdata;
632
633 /* first make sure at least one property is set, otherwise
634 * it won't change behavior from running without pdata.
635 */
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800636 if (!of_get_property(of_node, "sbs,i2c-retry-count", NULL) &&
637 !of_get_property(of_node, "sbs,poll-retry-count", NULL) &&
638 !of_get_property(of_node, "sbs,battery-detect-gpios", NULL))
Rhyland Klein6c75ea12011-09-14 13:19:07 -0700639 goto of_out;
640
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800641 pdata = devm_kzalloc(&client->dev, sizeof(struct sbs_platform_data),
Rhyland Klein6c75ea12011-09-14 13:19:07 -0700642 GFP_KERNEL);
643 if (!pdata)
644 goto of_out;
645
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800646 rc = of_property_read_u32(of_node, "sbs,i2c-retry-count", &prop);
Rhyland Klein6c75ea12011-09-14 13:19:07 -0700647 if (!rc)
648 pdata->i2c_retry_count = prop;
649
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800650 rc = of_property_read_u32(of_node, "sbs,poll-retry-count", &prop);
Rhyland Klein6c75ea12011-09-14 13:19:07 -0700651 if (!rc)
652 pdata->poll_retry_count = prop;
653
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800654 if (!of_get_property(of_node, "sbs,battery-detect-gpios", NULL)) {
Rhyland Klein6c75ea12011-09-14 13:19:07 -0700655 pdata->battery_detect = -1;
656 goto of_out;
657 }
658
659 pdata->battery_detect = of_get_named_gpio_flags(of_node,
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800660 "sbs,battery-detect-gpios", 0, &gpio_flags);
Rhyland Klein6c75ea12011-09-14 13:19:07 -0700661
662 if (gpio_flags & OF_GPIO_ACTIVE_LOW)
663 pdata->battery_detect_present = 0;
664 else
665 pdata->battery_detect_present = 1;
666
667of_out:
668 return pdata;
669}
670#else
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800671static struct sbs_platform_data *sbs_of_populate_pdata(
Rhyland Klein6c75ea12011-09-14 13:19:07 -0700672 struct i2c_client *client)
673{
674 return client->dev.platform_data;
675}
676#endif
677
Bill Pembertonc8afa642012-11-19 13:22:23 -0500678static int sbs_probe(struct i2c_client *client,
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700679 const struct i2c_device_id *id)
680{
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800681 struct sbs_info *chip;
682 struct sbs_platform_data *pdata = client->dev.platform_data;
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700683 int rc;
Rhyland Kleinbb879102011-02-28 16:55:28 -0800684 int irq;
Rhyland Klein52f56c62011-12-05 17:50:49 -0800685 char *name;
686
687 name = kasprintf(GFP_KERNEL, "sbs-%s", dev_name(&client->dev));
688 if (!name) {
689 dev_err(&client->dev, "Failed to allocate device name\n");
690 return -ENOMEM;
691 }
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700692
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800693 chip = kzalloc(sizeof(struct sbs_info), GFP_KERNEL);
Rhyland Klein52f56c62011-12-05 17:50:49 -0800694 if (!chip) {
695 rc = -ENOMEM;
696 goto exit_free_name;
697 }
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700698
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800699 chip->client = client;
700 chip->enable_detection = false;
701 chip->gpio_detect = false;
Rhyland Klein52f56c62011-12-05 17:50:49 -0800702 chip->power_supply.name = name;
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800703 chip->power_supply.type = POWER_SUPPLY_TYPE_BATTERY;
704 chip->power_supply.properties = sbs_properties;
705 chip->power_supply.num_properties = ARRAY_SIZE(sbs_properties);
706 chip->power_supply.get_property = sbs_get_property;
Rhyland Klein58ddafa2011-05-24 12:05:59 -0700707 /* ignore first notification of external change, it is generated
708 * from the power_supply_register call back
709 */
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800710 chip->ignore_changes = 1;
711 chip->last_state = POWER_SUPPLY_STATUS_UNKNOWN;
712 chip->power_supply.external_power_changed = sbs_external_power_changed;
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700713
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800714 pdata = sbs_of_populate_pdata(client);
Rhyland Klein6c75ea12011-09-14 13:19:07 -0700715
Rhyland Kleinbb879102011-02-28 16:55:28 -0800716 if (pdata) {
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800717 chip->gpio_detect = gpio_is_valid(pdata->battery_detect);
718 chip->pdata = pdata;
Rhyland Kleinbb879102011-02-28 16:55:28 -0800719 }
720
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800721 i2c_set_clientdata(client, chip);
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700722
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800723 if (!chip->gpio_detect)
Rhyland Kleinbb879102011-02-28 16:55:28 -0800724 goto skip_gpio;
725
726 rc = gpio_request(pdata->battery_detect, dev_name(&client->dev));
727 if (rc) {
728 dev_warn(&client->dev, "Failed to request gpio: %d\n", rc);
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800729 chip->gpio_detect = false;
Rhyland Kleinbb879102011-02-28 16:55:28 -0800730 goto skip_gpio;
731 }
732
733 rc = gpio_direction_input(pdata->battery_detect);
734 if (rc) {
735 dev_warn(&client->dev, "Failed to get gpio as input: %d\n", rc);
736 gpio_free(pdata->battery_detect);
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800737 chip->gpio_detect = false;
Rhyland Kleinbb879102011-02-28 16:55:28 -0800738 goto skip_gpio;
739 }
740
741 irq = gpio_to_irq(pdata->battery_detect);
742 if (irq <= 0) {
743 dev_warn(&client->dev, "Failed to get gpio as irq: %d\n", irq);
744 gpio_free(pdata->battery_detect);
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800745 chip->gpio_detect = false;
Rhyland Kleinbb879102011-02-28 16:55:28 -0800746 goto skip_gpio;
747 }
748
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800749 rc = request_irq(irq, sbs_irq,
Rhyland Kleinbb879102011-02-28 16:55:28 -0800750 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800751 dev_name(&client->dev), &chip->power_supply);
Rhyland Kleinbb879102011-02-28 16:55:28 -0800752 if (rc) {
753 dev_warn(&client->dev, "Failed to request irq: %d\n", rc);
754 gpio_free(pdata->battery_detect);
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800755 chip->gpio_detect = false;
Rhyland Kleinbb879102011-02-28 16:55:28 -0800756 goto skip_gpio;
757 }
758
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800759 chip->irq = irq;
Rhyland Kleinbb879102011-02-28 16:55:28 -0800760
761skip_gpio:
Olof Johanssona22b41a2012-09-06 11:32:29 -0700762 /*
763 * Before we register, we need to make sure we can actually talk
764 * to the battery.
765 */
766 rc = sbs_read_word_data(client, sbs_data[REG_STATUS].addr);
767 if (rc < 0) {
768 dev_err(&client->dev, "%s: Failed to get device status\n",
769 __func__);
770 goto exit_psupply;
771 }
Rhyland Kleinbb879102011-02-28 16:55:28 -0800772
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800773 rc = power_supply_register(&client->dev, &chip->power_supply);
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700774 if (rc) {
775 dev_err(&client->dev,
776 "%s: Failed to register power supply\n", __func__);
Rhyland Kleinbb879102011-02-28 16:55:28 -0800777 goto exit_psupply;
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700778 }
779
780 dev_info(&client->dev,
781 "%s: battery gas gauge device registered\n", client->name);
782
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800783 INIT_DELAYED_WORK(&chip->work, sbs_delayed_work);
Rhyland Klein58ddafa2011-05-24 12:05:59 -0700784
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800785 chip->enable_detection = true;
Rhyland Kleinee177d92011-05-24 12:06:50 -0700786
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700787 return 0;
Rhyland Kleinbb879102011-02-28 16:55:28 -0800788
789exit_psupply:
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800790 if (chip->irq)
791 free_irq(chip->irq, &chip->power_supply);
792 if (chip->gpio_detect)
Rhyland Kleinbb879102011-02-28 16:55:28 -0800793 gpio_free(pdata->battery_detect);
794
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800795 kfree(chip);
Rhyland Kleinbb879102011-02-28 16:55:28 -0800796
Rhyland Klein52f56c62011-12-05 17:50:49 -0800797exit_free_name:
798 kfree(name);
799
Rhyland Kleinbb879102011-02-28 16:55:28 -0800800 return rc;
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700801}
802
Bill Pemberton415ec692012-11-19 13:26:07 -0500803static int sbs_remove(struct i2c_client *client)
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700804{
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800805 struct sbs_info *chip = i2c_get_clientdata(client);
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700806
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800807 if (chip->irq)
808 free_irq(chip->irq, &chip->power_supply);
809 if (chip->gpio_detect)
810 gpio_free(chip->pdata->battery_detect);
Rhyland Kleinbb879102011-02-28 16:55:28 -0800811
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800812 power_supply_unregister(&chip->power_supply);
Rhyland Klein58ddafa2011-05-24 12:05:59 -0700813
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800814 cancel_delayed_work_sync(&chip->work);
Rhyland Klein58ddafa2011-05-24 12:05:59 -0700815
Rhyland Klein52f56c62011-12-05 17:50:49 -0800816 kfree(chip->power_supply.name);
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800817 kfree(chip);
818 chip = NULL;
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700819
820 return 0;
821}
822
Lars-Peter Clausen9c1d1af2013-03-10 14:34:07 +0100823#if defined CONFIG_PM_SLEEP
824
825static int sbs_suspend(struct device *dev)
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700826{
Lars-Peter Clausen9c1d1af2013-03-10 14:34:07 +0100827 struct i2c_client *client = to_i2c_client(dev);
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800828 struct sbs_info *chip = i2c_get_clientdata(client);
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700829 s32 ret;
830
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800831 if (chip->poll_time > 0)
832 cancel_delayed_work_sync(&chip->work);
Rhyland Klein58ddafa2011-05-24 12:05:59 -0700833
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700834 /* write to manufacturer access with sleep command */
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800835 ret = sbs_write_word_data(client, sbs_data[REG_MANUFACTURER_DATA].addr,
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700836 MANUFACTURER_ACCESS_SLEEP);
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800837 if (chip->is_present && ret < 0)
Rhyland Kleind3ab61e2010-09-21 15:33:55 -0700838 return ret;
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700839
840 return 0;
841}
Lars-Peter Clausen9c1d1af2013-03-10 14:34:07 +0100842
843static SIMPLE_DEV_PM_OPS(sbs_pm_ops, sbs_suspend, NULL);
844#define SBS_PM_OPS (&sbs_pm_ops)
845
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700846#else
Lars-Peter Clausen9c1d1af2013-03-10 14:34:07 +0100847#define SBS_PM_OPS NULL
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700848#endif
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700849
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800850static const struct i2c_device_id sbs_id[] = {
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700851 { "bq20z75", 0 },
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800852 { "sbs-battery", 1 },
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700853 {}
854};
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800855MODULE_DEVICE_TABLE(i2c, sbs_id);
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700856
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800857static struct i2c_driver sbs_battery_driver = {
858 .probe = sbs_probe,
Bill Pemberton28ea73f2012-11-19 13:20:40 -0500859 .remove = sbs_remove,
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800860 .id_table = sbs_id,
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700861 .driver = {
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800862 .name = "sbs-battery",
Sachin Kamat075ed032013-03-14 15:49:46 +0530863 .of_match_table = of_match_ptr(sbs_dt_ids),
Lars-Peter Clausen9c1d1af2013-03-10 14:34:07 +0100864 .pm = SBS_PM_OPS,
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700865 },
866};
Axel Lin5ff92e72012-01-21 14:42:54 +0800867module_i2c_driver(sbs_battery_driver);
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700868
Rhyland Klein3ddca0622011-12-05 17:50:46 -0800869MODULE_DESCRIPTION("SBS battery monitor driver");
Rhyland Kleina7640bf2010-09-05 15:31:23 -0700870MODULE_LICENSE("GPL");