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a7640bfa | 1 | /* |
3ddca062 | 2 | * Gas Gauge driver for SBS Compliant Batteries |
a7640bfa RK |
3 | * |
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> | |
bb879101 | 28 | #include <linux/interrupt.h> |
3b5dd3a4 | 29 | #include <linux/gpio/consumer.h> |
075ed03c | 30 | #include <linux/of.h> |
f4ed950a | 31 | #include <linux/stat.h> |
bb879101 | 32 | |
3ddca062 | 33 | #include <linux/power/sbs-battery.h> |
a7640bfa RK |
34 | |
35 | enum { | |
36 | REG_MANUFACTURER_DATA, | |
37 | REG_TEMPERATURE, | |
38 | REG_VOLTAGE, | |
39 | REG_CURRENT, | |
40 | REG_CAPACITY, | |
41 | REG_TIME_TO_EMPTY, | |
42 | REG_TIME_TO_FULL, | |
43 | REG_STATUS, | |
957cb720 | 44 | REG_CAPACITY_LEVEL, |
a7640bfa | 45 | REG_CYCLE_COUNT, |
d3ab61ec RK |
46 | REG_SERIAL_NUMBER, |
47 | REG_REMAINING_CAPACITY, | |
51d07566 | 48 | REG_REMAINING_CAPACITY_CHARGE, |
d3ab61ec | 49 | REG_FULL_CHARGE_CAPACITY, |
51d07566 | 50 | REG_FULL_CHARGE_CAPACITY_CHARGE, |
d3ab61ec | 51 | REG_DESIGN_CAPACITY, |
51d07566 | 52 | REG_DESIGN_CAPACITY_CHARGE, |
4495b0ad SQ |
53 | REG_DESIGN_VOLTAGE_MIN, |
54 | REG_DESIGN_VOLTAGE_MAX, | |
9ea89402 CYC |
55 | REG_MANUFACTURER, |
56 | REG_MODEL_NAME, | |
a7640bfa RK |
57 | }; |
58 | ||
51d07566 RK |
59 | /* Battery Mode defines */ |
60 | #define BATTERY_MODE_OFFSET 0x03 | |
61 | #define BATTERY_MODE_MASK 0x8000 | |
3ddca062 | 62 | enum sbs_battery_mode { |
51d07566 RK |
63 | BATTERY_MODE_AMPS, |
64 | BATTERY_MODE_WATTS | |
65 | }; | |
66 | ||
a7640bfa RK |
67 | /* manufacturer access defines */ |
68 | #define MANUFACTURER_ACCESS_STATUS 0x0006 | |
69 | #define MANUFACTURER_ACCESS_SLEEP 0x0011 | |
70 | ||
71 | /* battery status value bits */ | |
957cb720 | 72 | #define BATTERY_INITIALIZED 0x80 |
d3ab61ec | 73 | #define BATTERY_DISCHARGING 0x40 |
a7640bfa RK |
74 | #define BATTERY_FULL_CHARGED 0x20 |
75 | #define BATTERY_FULL_DISCHARGED 0x10 | |
76 | ||
9ea89402 | 77 | /* min_value and max_value are only valid for numerical data */ |
3ddca062 | 78 | #define SBS_DATA(_psp, _addr, _min_value, _max_value) { \ |
a7640bfa RK |
79 | .psp = _psp, \ |
80 | .addr = _addr, \ | |
81 | .min_value = _min_value, \ | |
82 | .max_value = _max_value, \ | |
83 | } | |
84 | ||
3ddca062 | 85 | static const struct chip_data { |
a7640bfa RK |
86 | enum power_supply_property psp; |
87 | u8 addr; | |
88 | int min_value; | |
89 | int max_value; | |
3ddca062 | 90 | } sbs_data[] = { |
a7640bfa | 91 | [REG_MANUFACTURER_DATA] = |
3ddca062 | 92 | SBS_DATA(POWER_SUPPLY_PROP_PRESENT, 0x00, 0, 65535), |
a7640bfa | 93 | [REG_TEMPERATURE] = |
3ddca062 | 94 | SBS_DATA(POWER_SUPPLY_PROP_TEMP, 0x08, 0, 65535), |
a7640bfa | 95 | [REG_VOLTAGE] = |
3ddca062 | 96 | SBS_DATA(POWER_SUPPLY_PROP_VOLTAGE_NOW, 0x09, 0, 20000), |
a7640bfa | 97 | [REG_CURRENT] = |
3ddca062 | 98 | SBS_DATA(POWER_SUPPLY_PROP_CURRENT_NOW, 0x0A, -32768, 32767), |
a7640bfa | 99 | [REG_CAPACITY] = |
b1f092f6 | 100 | SBS_DATA(POWER_SUPPLY_PROP_CAPACITY, 0x0D, 0, 100), |
d3ab61ec | 101 | [REG_REMAINING_CAPACITY] = |
3ddca062 | 102 | SBS_DATA(POWER_SUPPLY_PROP_ENERGY_NOW, 0x0F, 0, 65535), |
51d07566 | 103 | [REG_REMAINING_CAPACITY_CHARGE] = |
3ddca062 | 104 | SBS_DATA(POWER_SUPPLY_PROP_CHARGE_NOW, 0x0F, 0, 65535), |
d3ab61ec | 105 | [REG_FULL_CHARGE_CAPACITY] = |
3ddca062 | 106 | SBS_DATA(POWER_SUPPLY_PROP_ENERGY_FULL, 0x10, 0, 65535), |
51d07566 | 107 | [REG_FULL_CHARGE_CAPACITY_CHARGE] = |
3ddca062 | 108 | SBS_DATA(POWER_SUPPLY_PROP_CHARGE_FULL, 0x10, 0, 65535), |
a7640bfa | 109 | [REG_TIME_TO_EMPTY] = |
3ddca062 | 110 | SBS_DATA(POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG, 0x12, 0, 65535), |
a7640bfa | 111 | [REG_TIME_TO_FULL] = |
3ddca062 | 112 | SBS_DATA(POWER_SUPPLY_PROP_TIME_TO_FULL_AVG, 0x13, 0, 65535), |
a7640bfa | 113 | [REG_STATUS] = |
3ddca062 | 114 | SBS_DATA(POWER_SUPPLY_PROP_STATUS, 0x16, 0, 65535), |
957cb720 JC |
115 | [REG_CAPACITY_LEVEL] = |
116 | SBS_DATA(POWER_SUPPLY_PROP_CAPACITY_LEVEL, 0x16, 0, 65535), | |
a7640bfa | 117 | [REG_CYCLE_COUNT] = |
3ddca062 | 118 | SBS_DATA(POWER_SUPPLY_PROP_CYCLE_COUNT, 0x17, 0, 65535), |
d3ab61ec | 119 | [REG_DESIGN_CAPACITY] = |
3ddca062 | 120 | SBS_DATA(POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN, 0x18, 0, 65535), |
51d07566 | 121 | [REG_DESIGN_CAPACITY_CHARGE] = |
3ddca062 | 122 | SBS_DATA(POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 0x18, 0, 65535), |
4495b0ad SQ |
123 | [REG_DESIGN_VOLTAGE_MIN] = |
124 | SBS_DATA(POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 0x19, 0, 65535), | |
125 | [REG_DESIGN_VOLTAGE_MAX] = | |
3ddca062 | 126 | SBS_DATA(POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, 0x19, 0, 65535), |
a7640bfa | 127 | [REG_SERIAL_NUMBER] = |
3ddca062 | 128 | SBS_DATA(POWER_SUPPLY_PROP_SERIAL_NUMBER, 0x1C, 0, 65535), |
9ea89402 CYC |
129 | /* Properties of type `const char *' */ |
130 | [REG_MANUFACTURER] = | |
131 | SBS_DATA(POWER_SUPPLY_PROP_MANUFACTURER, 0x20, 0, 65535), | |
132 | [REG_MODEL_NAME] = | |
133 | SBS_DATA(POWER_SUPPLY_PROP_MODEL_NAME, 0x21, 0, 65535) | |
a7640bfa RK |
134 | }; |
135 | ||
3ddca062 | 136 | static enum power_supply_property sbs_properties[] = { |
a7640bfa | 137 | POWER_SUPPLY_PROP_STATUS, |
957cb720 | 138 | POWER_SUPPLY_PROP_CAPACITY_LEVEL, |
a7640bfa RK |
139 | POWER_SUPPLY_PROP_HEALTH, |
140 | POWER_SUPPLY_PROP_PRESENT, | |
141 | POWER_SUPPLY_PROP_TECHNOLOGY, | |
142 | POWER_SUPPLY_PROP_CYCLE_COUNT, | |
143 | POWER_SUPPLY_PROP_VOLTAGE_NOW, | |
144 | POWER_SUPPLY_PROP_CURRENT_NOW, | |
145 | POWER_SUPPLY_PROP_CAPACITY, | |
146 | POWER_SUPPLY_PROP_TEMP, | |
147 | POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG, | |
148 | POWER_SUPPLY_PROP_TIME_TO_FULL_AVG, | |
149 | POWER_SUPPLY_PROP_SERIAL_NUMBER, | |
4495b0ad | 150 | POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, |
d3ab61ec RK |
151 | POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, |
152 | POWER_SUPPLY_PROP_ENERGY_NOW, | |
153 | POWER_SUPPLY_PROP_ENERGY_FULL, | |
154 | POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN, | |
51d07566 RK |
155 | POWER_SUPPLY_PROP_CHARGE_NOW, |
156 | POWER_SUPPLY_PROP_CHARGE_FULL, | |
157 | POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, | |
9ea89402 CYC |
158 | /* Properties of type `const char *' */ |
159 | POWER_SUPPLY_PROP_MANUFACTURER, | |
160 | POWER_SUPPLY_PROP_MODEL_NAME | |
a7640bfa RK |
161 | }; |
162 | ||
3ddca062 | 163 | struct sbs_info { |
bb879101 | 164 | struct i2c_client *client; |
297d716f | 165 | struct power_supply *power_supply; |
3ddca062 | 166 | struct sbs_platform_data *pdata; |
bb879101 | 167 | bool is_present; |
3b5dd3a4 | 168 | struct gpio_desc *gpio_detect; |
bb879101 | 169 | bool enable_detection; |
58ddafae RK |
170 | int last_state; |
171 | int poll_time; | |
9edeaada AB |
172 | int i2c_retry_count; |
173 | int poll_retry_count; | |
58ddafae RK |
174 | struct delayed_work work; |
175 | int ignore_changes; | |
a7640bfa RK |
176 | }; |
177 | ||
9ea89402 CYC |
178 | static char model_name[I2C_SMBUS_BLOCK_MAX + 1]; |
179 | static char manufacturer[I2C_SMBUS_BLOCK_MAX + 1]; | |
f4ed950a | 180 | static bool force_load; |
9ea89402 | 181 | |
3ddca062 | 182 | static int sbs_read_word_data(struct i2c_client *client, u8 address) |
d3ab61ec | 183 | { |
3ddca062 | 184 | struct sbs_info *chip = i2c_get_clientdata(client); |
ff28fcef RK |
185 | s32 ret = 0; |
186 | int retries = 1; | |
187 | ||
3ddca062 | 188 | if (chip->pdata) |
9edeaada | 189 | retries = max(chip->i2c_retry_count + 1, 1); |
ff28fcef RK |
190 | |
191 | while (retries > 0) { | |
192 | ret = i2c_smbus_read_word_data(client, address); | |
193 | if (ret >= 0) | |
194 | break; | |
195 | retries--; | |
196 | } | |
d3ab61ec | 197 | |
d3ab61ec | 198 | if (ret < 0) { |
a7d9ace4 | 199 | dev_dbg(&client->dev, |
d3ab61ec RK |
200 | "%s: i2c read at address 0x%x failed\n", |
201 | __func__, address); | |
202 | return ret; | |
203 | } | |
ff28fcef | 204 | |
d3ab61ec RK |
205 | return le16_to_cpu(ret); |
206 | } | |
207 | ||
9ea89402 CYC |
208 | static int sbs_read_string_data(struct i2c_client *client, u8 address, |
209 | char *values) | |
210 | { | |
211 | struct sbs_info *chip = i2c_get_clientdata(client); | |
212 | s32 ret = 0, block_length = 0; | |
213 | int retries_length = 1, retries_block = 1; | |
214 | u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1]; | |
215 | ||
216 | if (chip->pdata) { | |
9edeaada AB |
217 | retries_length = max(chip->i2c_retry_count + 1, 1); |
218 | retries_block = max(chip->i2c_retry_count + 1, 1); | |
9ea89402 CYC |
219 | } |
220 | ||
221 | /* Adapter needs to support these two functions */ | |
222 | if (!i2c_check_functionality(client->adapter, | |
223 | I2C_FUNC_SMBUS_BYTE_DATA | | |
224 | I2C_FUNC_SMBUS_I2C_BLOCK)){ | |
225 | return -ENODEV; | |
226 | } | |
227 | ||
228 | /* Get the length of block data */ | |
229 | while (retries_length > 0) { | |
230 | ret = i2c_smbus_read_byte_data(client, address); | |
231 | if (ret >= 0) | |
232 | break; | |
233 | retries_length--; | |
234 | } | |
235 | ||
236 | if (ret < 0) { | |
237 | dev_dbg(&client->dev, | |
238 | "%s: i2c read at address 0x%x failed\n", | |
239 | __func__, address); | |
240 | return ret; | |
241 | } | |
242 | ||
243 | /* block_length does not include NULL terminator */ | |
244 | block_length = ret; | |
245 | if (block_length > I2C_SMBUS_BLOCK_MAX) { | |
246 | dev_err(&client->dev, | |
247 | "%s: Returned block_length is longer than 0x%x\n", | |
248 | __func__, I2C_SMBUS_BLOCK_MAX); | |
249 | return -EINVAL; | |
250 | } | |
251 | ||
252 | /* Get the block data */ | |
253 | while (retries_block > 0) { | |
254 | ret = i2c_smbus_read_i2c_block_data( | |
255 | client, address, | |
256 | block_length + 1, block_buffer); | |
257 | if (ret >= 0) | |
258 | break; | |
259 | retries_block--; | |
260 | } | |
261 | ||
262 | if (ret < 0) { | |
263 | dev_dbg(&client->dev, | |
264 | "%s: i2c read at address 0x%x failed\n", | |
265 | __func__, address); | |
266 | return ret; | |
267 | } | |
268 | ||
269 | /* block_buffer[0] == block_length */ | |
270 | memcpy(values, block_buffer + 1, block_length); | |
271 | values[block_length] = '\0'; | |
272 | ||
273 | return le16_to_cpu(ret); | |
274 | } | |
275 | ||
3ddca062 | 276 | static int sbs_write_word_data(struct i2c_client *client, u8 address, |
d3ab61ec RK |
277 | u16 value) |
278 | { | |
3ddca062 | 279 | struct sbs_info *chip = i2c_get_clientdata(client); |
ff28fcef RK |
280 | s32 ret = 0; |
281 | int retries = 1; | |
282 | ||
3ddca062 | 283 | if (chip->pdata) |
9edeaada | 284 | retries = max(chip->i2c_retry_count + 1, 1); |
ff28fcef RK |
285 | |
286 | while (retries > 0) { | |
287 | ret = i2c_smbus_write_word_data(client, address, | |
288 | le16_to_cpu(value)); | |
289 | if (ret >= 0) | |
290 | break; | |
291 | retries--; | |
292 | } | |
d3ab61ec | 293 | |
d3ab61ec | 294 | if (ret < 0) { |
a7d9ace4 | 295 | dev_dbg(&client->dev, |
d3ab61ec RK |
296 | "%s: i2c write to address 0x%x failed\n", |
297 | __func__, address); | |
298 | return ret; | |
299 | } | |
ff28fcef | 300 | |
d3ab61ec RK |
301 | return 0; |
302 | } | |
303 | ||
3ddca062 | 304 | static int sbs_get_battery_presence_and_health( |
a7640bfa RK |
305 | struct i2c_client *client, enum power_supply_property psp, |
306 | union power_supply_propval *val) | |
307 | { | |
308 | s32 ret; | |
3ddca062 | 309 | struct sbs_info *chip = i2c_get_clientdata(client); |
bb879101 | 310 | |
3b5dd3a4 PR |
311 | if (psp == POWER_SUPPLY_PROP_PRESENT && chip->gpio_detect) { |
312 | ret = gpiod_get_value_cansleep(chip->gpio_detect); | |
313 | if (ret < 0) | |
314 | return ret; | |
315 | val->intval = ret; | |
3ddca062 | 316 | chip->is_present = val->intval; |
bb879101 RK |
317 | return ret; |
318 | } | |
a7640bfa | 319 | |
17c6d397 GR |
320 | /* |
321 | * Write to ManufacturerAccess with ManufacturerAccess command | |
322 | * and then read the status. Do not check for error on the write | |
323 | * since not all batteries implement write access to this command, | |
324 | * while others mandate it. | |
325 | */ | |
326 | sbs_write_word_data(client, sbs_data[REG_MANUFACTURER_DATA].addr, | |
327 | MANUFACTURER_ACCESS_STATUS); | |
328 | ||
329 | ret = sbs_read_word_data(client, sbs_data[REG_MANUFACTURER_DATA].addr); | |
bb879101 RK |
330 | if (ret < 0) { |
331 | if (psp == POWER_SUPPLY_PROP_PRESENT) | |
332 | val->intval = 0; /* battery removed */ | |
d3ab61ec | 333 | return ret; |
bb879101 | 334 | } |
a7640bfa | 335 | |
3ddca062 RK |
336 | if (ret < sbs_data[REG_MANUFACTURER_DATA].min_value || |
337 | ret > sbs_data[REG_MANUFACTURER_DATA].max_value) { | |
a7640bfa RK |
338 | val->intval = 0; |
339 | return 0; | |
340 | } | |
341 | ||
342 | /* Mask the upper nibble of 2nd byte and | |
343 | * lower byte of response then | |
344 | * shift the result by 8 to get status*/ | |
345 | ret &= 0x0F00; | |
346 | ret >>= 8; | |
347 | if (psp == POWER_SUPPLY_PROP_PRESENT) { | |
348 | if (ret == 0x0F) | |
349 | /* battery removed */ | |
350 | val->intval = 0; | |
351 | else | |
352 | val->intval = 1; | |
353 | } else if (psp == POWER_SUPPLY_PROP_HEALTH) { | |
354 | if (ret == 0x09) | |
355 | val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE; | |
356 | else if (ret == 0x0B) | |
357 | val->intval = POWER_SUPPLY_HEALTH_OVERHEAT; | |
358 | else if (ret == 0x0C) | |
359 | val->intval = POWER_SUPPLY_HEALTH_DEAD; | |
360 | else | |
361 | val->intval = POWER_SUPPLY_HEALTH_GOOD; | |
362 | } | |
363 | ||
364 | return 0; | |
365 | } | |
366 | ||
3ddca062 | 367 | static int sbs_get_battery_property(struct i2c_client *client, |
a7640bfa RK |
368 | int reg_offset, enum power_supply_property psp, |
369 | union power_supply_propval *val) | |
370 | { | |
3ddca062 | 371 | struct sbs_info *chip = i2c_get_clientdata(client); |
a7640bfa RK |
372 | s32 ret; |
373 | ||
3ddca062 | 374 | ret = sbs_read_word_data(client, sbs_data[reg_offset].addr); |
d3ab61ec RK |
375 | if (ret < 0) |
376 | return ret; | |
377 | ||
378 | /* returned values are 16 bit */ | |
3ddca062 | 379 | if (sbs_data[reg_offset].min_value < 0) |
d3ab61ec | 380 | ret = (s16)ret; |
a7640bfa | 381 | |
3ddca062 RK |
382 | if (ret >= sbs_data[reg_offset].min_value && |
383 | ret <= sbs_data[reg_offset].max_value) { | |
a7640bfa | 384 | val->intval = ret; |
957cb720 JC |
385 | if (psp == POWER_SUPPLY_PROP_CAPACITY_LEVEL) { |
386 | if (!(ret & BATTERY_INITIALIZED)) | |
387 | val->intval = | |
388 | POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN; | |
389 | else if (ret & BATTERY_FULL_CHARGED) | |
390 | val->intval = | |
391 | POWER_SUPPLY_CAPACITY_LEVEL_FULL; | |
392 | else if (ret & BATTERY_FULL_DISCHARGED) | |
393 | val->intval = | |
394 | POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL; | |
395 | else | |
396 | val->intval = | |
397 | POWER_SUPPLY_CAPACITY_LEVEL_NORMAL; | |
58ddafae | 398 | return 0; |
957cb720 JC |
399 | } else if (psp != POWER_SUPPLY_PROP_STATUS) { |
400 | return 0; | |
401 | } | |
58ddafae RK |
402 | |
403 | if (ret & BATTERY_FULL_CHARGED) | |
404 | val->intval = POWER_SUPPLY_STATUS_FULL; | |
58ddafae RK |
405 | else if (ret & BATTERY_DISCHARGING) |
406 | val->intval = POWER_SUPPLY_STATUS_DISCHARGING; | |
407 | else | |
408 | val->intval = POWER_SUPPLY_STATUS_CHARGING; | |
409 | ||
3ddca062 RK |
410 | if (chip->poll_time == 0) |
411 | chip->last_state = val->intval; | |
412 | else if (chip->last_state != val->intval) { | |
413 | cancel_delayed_work_sync(&chip->work); | |
297d716f | 414 | power_supply_changed(chip->power_supply); |
3ddca062 | 415 | chip->poll_time = 0; |
a7640bfa | 416 | } |
a7640bfa RK |
417 | } else { |
418 | if (psp == POWER_SUPPLY_PROP_STATUS) | |
419 | val->intval = POWER_SUPPLY_STATUS_UNKNOWN; | |
420 | else | |
421 | val->intval = 0; | |
422 | } | |
423 | ||
424 | return 0; | |
425 | } | |
426 | ||
9ea89402 CYC |
427 | static int sbs_get_battery_string_property(struct i2c_client *client, |
428 | int reg_offset, enum power_supply_property psp, char *val) | |
429 | { | |
430 | s32 ret; | |
431 | ||
432 | ret = sbs_read_string_data(client, sbs_data[reg_offset].addr, val); | |
433 | ||
434 | if (ret < 0) | |
435 | return ret; | |
436 | ||
437 | return 0; | |
438 | } | |
439 | ||
3ddca062 | 440 | static void sbs_unit_adjustment(struct i2c_client *client, |
d3ab61ec RK |
441 | enum power_supply_property psp, union power_supply_propval *val) |
442 | { | |
443 | #define BASE_UNIT_CONVERSION 1000 | |
444 | #define BATTERY_MODE_CAP_MULT_WATT (10 * BASE_UNIT_CONVERSION) | |
909a78b3 BL |
445 | #define TIME_UNIT_CONVERSION 60 |
446 | #define TEMP_KELVIN_TO_CELSIUS 2731 | |
d3ab61ec RK |
447 | switch (psp) { |
448 | case POWER_SUPPLY_PROP_ENERGY_NOW: | |
449 | case POWER_SUPPLY_PROP_ENERGY_FULL: | |
450 | case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN: | |
3ddca062 | 451 | /* sbs provides energy in units of 10mWh. |
909a78b3 BL |
452 | * Convert to µWh |
453 | */ | |
d3ab61ec RK |
454 | val->intval *= BATTERY_MODE_CAP_MULT_WATT; |
455 | break; | |
456 | ||
457 | case POWER_SUPPLY_PROP_VOLTAGE_NOW: | |
4495b0ad | 458 | case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN: |
d3ab61ec RK |
459 | case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN: |
460 | case POWER_SUPPLY_PROP_CURRENT_NOW: | |
51d07566 RK |
461 | case POWER_SUPPLY_PROP_CHARGE_NOW: |
462 | case POWER_SUPPLY_PROP_CHARGE_FULL: | |
463 | case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: | |
d3ab61ec RK |
464 | val->intval *= BASE_UNIT_CONVERSION; |
465 | break; | |
466 | ||
467 | case POWER_SUPPLY_PROP_TEMP: | |
3ddca062 | 468 | /* sbs provides battery temperature in 0.1K |
909a78b3 BL |
469 | * so convert it to 0.1°C |
470 | */ | |
471 | val->intval -= TEMP_KELVIN_TO_CELSIUS; | |
d3ab61ec RK |
472 | break; |
473 | ||
474 | case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG: | |
475 | case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG: | |
3ddca062 | 476 | /* sbs provides time to empty and time to full in minutes. |
909a78b3 BL |
477 | * Convert to seconds |
478 | */ | |
d3ab61ec RK |
479 | val->intval *= TIME_UNIT_CONVERSION; |
480 | break; | |
481 | ||
482 | default: | |
483 | dev_dbg(&client->dev, | |
484 | "%s: no need for unit conversion %d\n", __func__, psp); | |
485 | } | |
486 | } | |
487 | ||
3ddca062 RK |
488 | static enum sbs_battery_mode sbs_set_battery_mode(struct i2c_client *client, |
489 | enum sbs_battery_mode mode) | |
51d07566 RK |
490 | { |
491 | int ret, original_val; | |
492 | ||
3ddca062 | 493 | original_val = sbs_read_word_data(client, BATTERY_MODE_OFFSET); |
51d07566 RK |
494 | if (original_val < 0) |
495 | return original_val; | |
496 | ||
497 | if ((original_val & BATTERY_MODE_MASK) == mode) | |
498 | return mode; | |
499 | ||
500 | if (mode == BATTERY_MODE_AMPS) | |
501 | ret = original_val & ~BATTERY_MODE_MASK; | |
502 | else | |
503 | ret = original_val | BATTERY_MODE_MASK; | |
504 | ||
3ddca062 | 505 | ret = sbs_write_word_data(client, BATTERY_MODE_OFFSET, ret); |
51d07566 RK |
506 | if (ret < 0) |
507 | return ret; | |
508 | ||
509 | return original_val & BATTERY_MODE_MASK; | |
510 | } | |
511 | ||
3ddca062 | 512 | static int sbs_get_battery_capacity(struct i2c_client *client, |
d3ab61ec | 513 | int reg_offset, enum power_supply_property psp, |
a7640bfa RK |
514 | union power_supply_propval *val) |
515 | { | |
516 | s32 ret; | |
3ddca062 | 517 | enum sbs_battery_mode mode = BATTERY_MODE_WATTS; |
51d07566 RK |
518 | |
519 | if (power_supply_is_amp_property(psp)) | |
520 | mode = BATTERY_MODE_AMPS; | |
521 | ||
3ddca062 | 522 | mode = sbs_set_battery_mode(client, mode); |
51d07566 RK |
523 | if (mode < 0) |
524 | return mode; | |
a7640bfa | 525 | |
3ddca062 | 526 | ret = sbs_read_word_data(client, sbs_data[reg_offset].addr); |
d3ab61ec RK |
527 | if (ret < 0) |
528 | return ret; | |
a7640bfa | 529 | |
d3ab61ec | 530 | if (psp == POWER_SUPPLY_PROP_CAPACITY) { |
3ddca062 | 531 | /* sbs spec says that this can be >100 % |
d3ab61ec RK |
532 | * even if max value is 100 % */ |
533 | val->intval = min(ret, 100); | |
534 | } else | |
535 | val->intval = ret; | |
536 | ||
3ddca062 | 537 | ret = sbs_set_battery_mode(client, mode); |
51d07566 RK |
538 | if (ret < 0) |
539 | return ret; | |
540 | ||
d3ab61ec RK |
541 | return 0; |
542 | } | |
543 | ||
3ddca062 RK |
544 | static char sbs_serial[5]; |
545 | static int sbs_get_battery_serial_number(struct i2c_client *client, | |
d3ab61ec RK |
546 | union power_supply_propval *val) |
547 | { | |
548 | int ret; | |
549 | ||
3ddca062 | 550 | ret = sbs_read_word_data(client, sbs_data[REG_SERIAL_NUMBER].addr); |
d3ab61ec RK |
551 | if (ret < 0) |
552 | return ret; | |
553 | ||
3ddca062 RK |
554 | ret = sprintf(sbs_serial, "%04x", ret); |
555 | val->strval = sbs_serial; | |
a7640bfa RK |
556 | |
557 | return 0; | |
558 | } | |
559 | ||
3ddca062 | 560 | static int sbs_get_property_index(struct i2c_client *client, |
51d07566 RK |
561 | enum power_supply_property psp) |
562 | { | |
563 | int count; | |
3ddca062 RK |
564 | for (count = 0; count < ARRAY_SIZE(sbs_data); count++) |
565 | if (psp == sbs_data[count].psp) | |
51d07566 RK |
566 | return count; |
567 | ||
568 | dev_warn(&client->dev, | |
569 | "%s: Invalid Property - %d\n", __func__, psp); | |
570 | ||
571 | return -EINVAL; | |
572 | } | |
573 | ||
3ddca062 | 574 | static int sbs_get_property(struct power_supply *psy, |
a7640bfa RK |
575 | enum power_supply_property psp, |
576 | union power_supply_propval *val) | |
577 | { | |
bb879101 | 578 | int ret = 0; |
297d716f | 579 | struct sbs_info *chip = power_supply_get_drvdata(psy); |
3ddca062 | 580 | struct i2c_client *client = chip->client; |
a7640bfa RK |
581 | |
582 | switch (psp) { | |
583 | case POWER_SUPPLY_PROP_PRESENT: | |
584 | case POWER_SUPPLY_PROP_HEALTH: | |
3ddca062 | 585 | ret = sbs_get_battery_presence_and_health(client, psp, val); |
a7d9ace4 RK |
586 | if (psp == POWER_SUPPLY_PROP_PRESENT) |
587 | return 0; | |
a7640bfa RK |
588 | break; |
589 | ||
590 | case POWER_SUPPLY_PROP_TECHNOLOGY: | |
591 | val->intval = POWER_SUPPLY_TECHNOLOGY_LION; | |
5da50988 | 592 | goto done; /* don't trigger power_supply_changed()! */ |
a7640bfa | 593 | |
d3ab61ec RK |
594 | case POWER_SUPPLY_PROP_ENERGY_NOW: |
595 | case POWER_SUPPLY_PROP_ENERGY_FULL: | |
596 | case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN: | |
51d07566 RK |
597 | case POWER_SUPPLY_PROP_CHARGE_NOW: |
598 | case POWER_SUPPLY_PROP_CHARGE_FULL: | |
599 | case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: | |
a7640bfa | 600 | case POWER_SUPPLY_PROP_CAPACITY: |
3ddca062 | 601 | ret = sbs_get_property_index(client, psp); |
bb879101 RK |
602 | if (ret < 0) |
603 | break; | |
d3ab61ec | 604 | |
3ddca062 | 605 | ret = sbs_get_battery_capacity(client, ret, psp, val); |
d3ab61ec RK |
606 | break; |
607 | ||
608 | case POWER_SUPPLY_PROP_SERIAL_NUMBER: | |
3ddca062 | 609 | ret = sbs_get_battery_serial_number(client, val); |
a7640bfa RK |
610 | break; |
611 | ||
612 | case POWER_SUPPLY_PROP_STATUS: | |
957cb720 | 613 | case POWER_SUPPLY_PROP_CAPACITY_LEVEL: |
a7640bfa RK |
614 | case POWER_SUPPLY_PROP_CYCLE_COUNT: |
615 | case POWER_SUPPLY_PROP_VOLTAGE_NOW: | |
616 | case POWER_SUPPLY_PROP_CURRENT_NOW: | |
617 | case POWER_SUPPLY_PROP_TEMP: | |
618 | case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG: | |
619 | case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG: | |
4495b0ad | 620 | case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN: |
d3ab61ec | 621 | case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN: |
3ddca062 | 622 | ret = sbs_get_property_index(client, psp); |
bb879101 RK |
623 | if (ret < 0) |
624 | break; | |
d3ab61ec | 625 | |
3ddca062 | 626 | ret = sbs_get_battery_property(client, ret, psp, val); |
a7640bfa RK |
627 | break; |
628 | ||
9ea89402 CYC |
629 | case POWER_SUPPLY_PROP_MODEL_NAME: |
630 | ret = sbs_get_property_index(client, psp); | |
631 | if (ret < 0) | |
632 | break; | |
633 | ||
634 | ret = sbs_get_battery_string_property(client, ret, psp, | |
635 | model_name); | |
636 | val->strval = model_name; | |
637 | break; | |
638 | ||
639 | case POWER_SUPPLY_PROP_MANUFACTURER: | |
640 | ret = sbs_get_property_index(client, psp); | |
641 | if (ret < 0) | |
642 | break; | |
643 | ||
644 | ret = sbs_get_battery_string_property(client, ret, psp, | |
645 | manufacturer); | |
646 | val->strval = manufacturer; | |
647 | break; | |
648 | ||
a7640bfa RK |
649 | default: |
650 | dev_err(&client->dev, | |
651 | "%s: INVALID property\n", __func__); | |
652 | return -EINVAL; | |
653 | } | |
654 | ||
3ddca062 | 655 | if (!chip->enable_detection) |
bb879101 RK |
656 | goto done; |
657 | ||
3ddca062 RK |
658 | if (!chip->gpio_detect && |
659 | chip->is_present != (ret >= 0)) { | |
660 | chip->is_present = (ret >= 0); | |
297d716f | 661 | power_supply_changed(chip->power_supply); |
bb879101 RK |
662 | } |
663 | ||
664 | done: | |
665 | if (!ret) { | |
666 | /* Convert units to match requirements for power supply class */ | |
3ddca062 | 667 | sbs_unit_adjustment(client, psp, val); |
bb879101 | 668 | } |
d3ab61ec | 669 | |
a7640bfa | 670 | dev_dbg(&client->dev, |
a7d9ace4 RK |
671 | "%s: property = %d, value = %x\n", __func__, psp, val->intval); |
672 | ||
3ddca062 | 673 | if (ret && chip->is_present) |
a7d9ace4 RK |
674 | return ret; |
675 | ||
676 | /* battery not present, so return NODATA for properties */ | |
677 | if (ret) | |
678 | return -ENODATA; | |
a7640bfa | 679 | |
a7d9ace4 | 680 | return 0; |
a7640bfa RK |
681 | } |
682 | ||
3ddca062 | 683 | static irqreturn_t sbs_irq(int irq, void *devid) |
bb879101 | 684 | { |
d2cec82c PR |
685 | struct sbs_info *chip = devid; |
686 | struct power_supply *battery = chip->power_supply; | |
3b5dd3a4 | 687 | int ret; |
bb879101 | 688 | |
3b5dd3a4 PR |
689 | ret = gpiod_get_value_cansleep(chip->gpio_detect); |
690 | if (ret < 0) | |
691 | return ret; | |
692 | chip->is_present = ret; | |
bb879101 RK |
693 | power_supply_changed(battery); |
694 | ||
695 | return IRQ_HANDLED; | |
696 | } | |
697 | ||
3ddca062 | 698 | static void sbs_external_power_changed(struct power_supply *psy) |
58ddafae | 699 | { |
297d716f | 700 | struct sbs_info *chip = power_supply_get_drvdata(psy); |
58ddafae | 701 | |
3ddca062 RK |
702 | if (chip->ignore_changes > 0) { |
703 | chip->ignore_changes--; | |
58ddafae RK |
704 | return; |
705 | } | |
706 | ||
707 | /* cancel outstanding work */ | |
3ddca062 | 708 | cancel_delayed_work_sync(&chip->work); |
58ddafae | 709 | |
3ddca062 RK |
710 | schedule_delayed_work(&chip->work, HZ); |
711 | chip->poll_time = chip->pdata->poll_retry_count; | |
58ddafae RK |
712 | } |
713 | ||
3ddca062 | 714 | static void sbs_delayed_work(struct work_struct *work) |
58ddafae | 715 | { |
3ddca062 | 716 | struct sbs_info *chip; |
58ddafae RK |
717 | s32 ret; |
718 | ||
3ddca062 | 719 | chip = container_of(work, struct sbs_info, work.work); |
58ddafae | 720 | |
3ddca062 | 721 | ret = sbs_read_word_data(chip->client, sbs_data[REG_STATUS].addr); |
58ddafae RK |
722 | /* if the read failed, give up on this work */ |
723 | if (ret < 0) { | |
3ddca062 | 724 | chip->poll_time = 0; |
58ddafae RK |
725 | return; |
726 | } | |
727 | ||
728 | if (ret & BATTERY_FULL_CHARGED) | |
729 | ret = POWER_SUPPLY_STATUS_FULL; | |
58ddafae RK |
730 | else if (ret & BATTERY_DISCHARGING) |
731 | ret = POWER_SUPPLY_STATUS_DISCHARGING; | |
732 | else | |
733 | ret = POWER_SUPPLY_STATUS_CHARGING; | |
734 | ||
3ddca062 RK |
735 | if (chip->last_state != ret) { |
736 | chip->poll_time = 0; | |
297d716f | 737 | power_supply_changed(chip->power_supply); |
58ddafae RK |
738 | return; |
739 | } | |
3ddca062 RK |
740 | if (chip->poll_time > 0) { |
741 | schedule_delayed_work(&chip->work, HZ); | |
742 | chip->poll_time--; | |
58ddafae RK |
743 | return; |
744 | } | |
745 | } | |
746 | ||
297d716f KK |
747 | static const struct power_supply_desc sbs_default_desc = { |
748 | .type = POWER_SUPPLY_TYPE_BATTERY, | |
749 | .properties = sbs_properties, | |
750 | .num_properties = ARRAY_SIZE(sbs_properties), | |
751 | .get_property = sbs_get_property, | |
752 | .external_power_changed = sbs_external_power_changed, | |
753 | }; | |
754 | ||
c8afa640 | 755 | static int sbs_probe(struct i2c_client *client, |
a7640bfa RK |
756 | const struct i2c_device_id *id) |
757 | { | |
3ddca062 | 758 | struct sbs_info *chip; |
297d716f | 759 | struct power_supply_desc *sbs_desc; |
3ddca062 | 760 | struct sbs_platform_data *pdata = client->dev.platform_data; |
2dc9215d | 761 | struct power_supply_config psy_cfg = {}; |
a7640bfa | 762 | int rc; |
bb879101 | 763 | int irq; |
a7640bfa | 764 | |
297d716f KK |
765 | sbs_desc = devm_kmemdup(&client->dev, &sbs_default_desc, |
766 | sizeof(*sbs_desc), GFP_KERNEL); | |
767 | if (!sbs_desc) | |
768 | return -ENOMEM; | |
769 | ||
770 | sbs_desc->name = devm_kasprintf(&client->dev, GFP_KERNEL, "sbs-%s", | |
771 | dev_name(&client->dev)); | |
772 | if (!sbs_desc->name) | |
a7640bfa | 773 | return -ENOMEM; |
52f56c69 | 774 | |
9239a86f | 775 | chip = devm_kzalloc(&client->dev, sizeof(struct sbs_info), GFP_KERNEL); |
297d716f KK |
776 | if (!chip) |
777 | return -ENOMEM; | |
a7640bfa | 778 | |
3ddca062 RK |
779 | chip->client = client; |
780 | chip->enable_detection = false; | |
2dc9215d | 781 | psy_cfg.of_node = client->dev.of_node; |
297d716f | 782 | psy_cfg.drv_data = chip; |
58ddafae RK |
783 | /* ignore first notification of external change, it is generated |
784 | * from the power_supply_register call back | |
785 | */ | |
3ddca062 RK |
786 | chip->ignore_changes = 1; |
787 | chip->last_state = POWER_SUPPLY_STATUS_UNKNOWN; | |
a7640bfa | 788 | |
9edeaada AB |
789 | /* use pdata if available, fall back to DT properties, |
790 | * or hardcoded defaults if not | |
791 | */ | |
792 | rc = of_property_read_u32(client->dev.of_node, "sbs,i2c-retry-count", | |
793 | &chip->i2c_retry_count); | |
794 | if (rc) | |
795 | chip->i2c_retry_count = 1; | |
796 | ||
797 | rc = of_property_read_u32(client->dev.of_node, "sbs,poll-retry-count", | |
798 | &chip->poll_retry_count); | |
799 | if (rc) | |
800 | chip->poll_retry_count = 0; | |
801 | ||
802 | if (pdata) { | |
803 | chip->poll_retry_count = pdata->poll_retry_count; | |
804 | chip->i2c_retry_count = pdata->i2c_retry_count; | |
805 | } | |
6c75ea1e | 806 | |
3b5dd3a4 PR |
807 | chip->gpio_detect = devm_gpiod_get_optional(&client->dev, |
808 | "sbs,battery-detect", GPIOD_IN); | |
809 | if (IS_ERR(chip->gpio_detect)) { | |
810 | dev_err(&client->dev, "Failed to get gpio: %ld\n", | |
811 | PTR_ERR(chip->gpio_detect)); | |
812 | return PTR_ERR(chip->gpio_detect); | |
bb879101 RK |
813 | } |
814 | ||
3ddca062 | 815 | i2c_set_clientdata(client, chip); |
a7640bfa | 816 | |
3ddca062 | 817 | if (!chip->gpio_detect) |
bb879101 RK |
818 | goto skip_gpio; |
819 | ||
3b5dd3a4 | 820 | irq = gpiod_to_irq(chip->gpio_detect); |
bb879101 RK |
821 | if (irq <= 0) { |
822 | dev_warn(&client->dev, "Failed to get gpio as irq: %d\n", irq); | |
bb879101 RK |
823 | goto skip_gpio; |
824 | } | |
825 | ||
d2cec82c | 826 | rc = devm_request_threaded_irq(&client->dev, irq, NULL, sbs_irq, |
bb879101 | 827 | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, |
d2cec82c | 828 | dev_name(&client->dev), chip); |
bb879101 RK |
829 | if (rc) { |
830 | dev_warn(&client->dev, "Failed to request irq: %d\n", rc); | |
bb879101 RK |
831 | goto skip_gpio; |
832 | } | |
833 | ||
bb879101 | 834 | skip_gpio: |
a22b41a3 | 835 | /* |
f4ed950a | 836 | * Before we register, we might need to make sure we can actually talk |
a22b41a3 OJ |
837 | * to the battery. |
838 | */ | |
3b5dd3a4 | 839 | if (!(force_load || chip->gpio_detect)) { |
f4ed950a FK |
840 | rc = sbs_read_word_data(client, sbs_data[REG_STATUS].addr); |
841 | ||
842 | if (rc < 0) { | |
843 | dev_err(&client->dev, "%s: Failed to get device status\n", | |
844 | __func__); | |
845 | goto exit_psupply; | |
846 | } | |
a22b41a3 | 847 | } |
bb879101 | 848 | |
492ff9d8 | 849 | chip->power_supply = devm_power_supply_register(&client->dev, sbs_desc, |
297d716f KK |
850 | &psy_cfg); |
851 | if (IS_ERR(chip->power_supply)) { | |
a7640bfa RK |
852 | dev_err(&client->dev, |
853 | "%s: Failed to register power supply\n", __func__); | |
297d716f | 854 | rc = PTR_ERR(chip->power_supply); |
bb879101 | 855 | goto exit_psupply; |
a7640bfa RK |
856 | } |
857 | ||
858 | dev_info(&client->dev, | |
859 | "%s: battery gas gauge device registered\n", client->name); | |
860 | ||
3ddca062 | 861 | INIT_DELAYED_WORK(&chip->work, sbs_delayed_work); |
58ddafae | 862 | |
3ddca062 | 863 | chip->enable_detection = true; |
ee177d96 | 864 | |
a7640bfa | 865 | return 0; |
bb879101 RK |
866 | |
867 | exit_psupply: | |
bb879101 | 868 | return rc; |
a7640bfa RK |
869 | } |
870 | ||
415ec69f | 871 | static int sbs_remove(struct i2c_client *client) |
a7640bfa | 872 | { |
3ddca062 | 873 | struct sbs_info *chip = i2c_get_clientdata(client); |
a7640bfa | 874 | |
3ddca062 | 875 | cancel_delayed_work_sync(&chip->work); |
58ddafae | 876 | |
a7640bfa RK |
877 | return 0; |
878 | } | |
879 | ||
9c1d1af0 LPC |
880 | #if defined CONFIG_PM_SLEEP |
881 | ||
882 | static int sbs_suspend(struct device *dev) | |
a7640bfa | 883 | { |
9c1d1af0 | 884 | struct i2c_client *client = to_i2c_client(dev); |
3ddca062 | 885 | struct sbs_info *chip = i2c_get_clientdata(client); |
a7640bfa | 886 | |
3ddca062 RK |
887 | if (chip->poll_time > 0) |
888 | cancel_delayed_work_sync(&chip->work); | |
58ddafae | 889 | |
17c6d397 GR |
890 | /* |
891 | * Write to manufacturer access with sleep command. | |
892 | * Support is manufacturer dependend, so ignore errors. | |
893 | */ | |
894 | sbs_write_word_data(client, sbs_data[REG_MANUFACTURER_DATA].addr, | |
a7640bfa | 895 | MANUFACTURER_ACCESS_SLEEP); |
a7640bfa RK |
896 | |
897 | return 0; | |
898 | } | |
9c1d1af0 LPC |
899 | |
900 | static SIMPLE_DEV_PM_OPS(sbs_pm_ops, sbs_suspend, NULL); | |
901 | #define SBS_PM_OPS (&sbs_pm_ops) | |
902 | ||
a7640bfa | 903 | #else |
9c1d1af0 | 904 | #define SBS_PM_OPS NULL |
a7640bfa | 905 | #endif |
a7640bfa | 906 | |
3ddca062 | 907 | static const struct i2c_device_id sbs_id[] = { |
a7640bfa | 908 | { "bq20z75", 0 }, |
3ddca062 | 909 | { "sbs-battery", 1 }, |
a7640bfa RK |
910 | {} |
911 | }; | |
3ddca062 RK |
912 | MODULE_DEVICE_TABLE(i2c, sbs_id); |
913 | ||
9edeaada AB |
914 | static const struct of_device_id sbs_dt_ids[] = { |
915 | { .compatible = "sbs,sbs-battery" }, | |
916 | { .compatible = "ti,bq20z75" }, | |
917 | { } | |
918 | }; | |
919 | MODULE_DEVICE_TABLE(of, sbs_dt_ids); | |
920 | ||
3ddca062 RK |
921 | static struct i2c_driver sbs_battery_driver = { |
922 | .probe = sbs_probe, | |
28ea73f4 | 923 | .remove = sbs_remove, |
3ddca062 | 924 | .id_table = sbs_id, |
a7640bfa | 925 | .driver = { |
3ddca062 | 926 | .name = "sbs-battery", |
9edeaada | 927 | .of_match_table = sbs_dt_ids, |
9c1d1af0 | 928 | .pm = SBS_PM_OPS, |
a7640bfa RK |
929 | }, |
930 | }; | |
5ff92e7a | 931 | module_i2c_driver(sbs_battery_driver); |
a7640bfa | 932 | |
3ddca062 | 933 | MODULE_DESCRIPTION("SBS battery monitor driver"); |
a7640bfa | 934 | MODULE_LICENSE("GPL"); |
f4ed950a FK |
935 | |
936 | module_param(force_load, bool, S_IRUSR | S_IRGRP | S_IROTH); | |
937 | MODULE_PARM_DESC(force_load, | |
938 | "Attempt to load the driver even if no battery is connected"); |