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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 RK |
28 | #include <linux/interrupt.h> |
29 | #include <linux/gpio.h> | |
075ed03c | 30 | #include <linux/of.h> |
bb879101 | 31 | |
3ddca062 | 32 | #include <linux/power/sbs-battery.h> |
a7640bfa RK |
33 | |
34 | enum { | |
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, | |
d3ab61ec RK |
44 | REG_SERIAL_NUMBER, |
45 | REG_REMAINING_CAPACITY, | |
51d07566 | 46 | REG_REMAINING_CAPACITY_CHARGE, |
d3ab61ec | 47 | REG_FULL_CHARGE_CAPACITY, |
51d07566 | 48 | REG_FULL_CHARGE_CAPACITY_CHARGE, |
d3ab61ec | 49 | REG_DESIGN_CAPACITY, |
51d07566 | 50 | REG_DESIGN_CAPACITY_CHARGE, |
d3ab61ec | 51 | REG_DESIGN_VOLTAGE, |
a7640bfa RK |
52 | }; |
53 | ||
51d07566 RK |
54 | /* Battery Mode defines */ |
55 | #define BATTERY_MODE_OFFSET 0x03 | |
56 | #define BATTERY_MODE_MASK 0x8000 | |
3ddca062 | 57 | enum sbs_battery_mode { |
51d07566 RK |
58 | BATTERY_MODE_AMPS, |
59 | BATTERY_MODE_WATTS | |
60 | }; | |
61 | ||
a7640bfa RK |
62 | /* manufacturer access defines */ |
63 | #define MANUFACTURER_ACCESS_STATUS 0x0006 | |
64 | #define MANUFACTURER_ACCESS_SLEEP 0x0011 | |
65 | ||
66 | /* battery status value bits */ | |
d3ab61ec | 67 | #define BATTERY_DISCHARGING 0x40 |
a7640bfa RK |
68 | #define BATTERY_FULL_CHARGED 0x20 |
69 | #define BATTERY_FULL_DISCHARGED 0x10 | |
70 | ||
3ddca062 | 71 | #define SBS_DATA(_psp, _addr, _min_value, _max_value) { \ |
a7640bfa RK |
72 | .psp = _psp, \ |
73 | .addr = _addr, \ | |
74 | .min_value = _min_value, \ | |
75 | .max_value = _max_value, \ | |
76 | } | |
77 | ||
3ddca062 | 78 | static const struct chip_data { |
a7640bfa RK |
79 | enum power_supply_property psp; |
80 | u8 addr; | |
81 | int min_value; | |
82 | int max_value; | |
3ddca062 | 83 | } sbs_data[] = { |
a7640bfa | 84 | [REG_MANUFACTURER_DATA] = |
3ddca062 | 85 | SBS_DATA(POWER_SUPPLY_PROP_PRESENT, 0x00, 0, 65535), |
a7640bfa | 86 | [REG_TEMPERATURE] = |
3ddca062 | 87 | SBS_DATA(POWER_SUPPLY_PROP_TEMP, 0x08, 0, 65535), |
a7640bfa | 88 | [REG_VOLTAGE] = |
3ddca062 | 89 | SBS_DATA(POWER_SUPPLY_PROP_VOLTAGE_NOW, 0x09, 0, 20000), |
a7640bfa | 90 | [REG_CURRENT] = |
3ddca062 | 91 | SBS_DATA(POWER_SUPPLY_PROP_CURRENT_NOW, 0x0A, -32768, 32767), |
a7640bfa | 92 | [REG_CAPACITY] = |
b1f092f6 | 93 | SBS_DATA(POWER_SUPPLY_PROP_CAPACITY, 0x0D, 0, 100), |
d3ab61ec | 94 | [REG_REMAINING_CAPACITY] = |
3ddca062 | 95 | SBS_DATA(POWER_SUPPLY_PROP_ENERGY_NOW, 0x0F, 0, 65535), |
51d07566 | 96 | [REG_REMAINING_CAPACITY_CHARGE] = |
3ddca062 | 97 | SBS_DATA(POWER_SUPPLY_PROP_CHARGE_NOW, 0x0F, 0, 65535), |
d3ab61ec | 98 | [REG_FULL_CHARGE_CAPACITY] = |
3ddca062 | 99 | SBS_DATA(POWER_SUPPLY_PROP_ENERGY_FULL, 0x10, 0, 65535), |
51d07566 | 100 | [REG_FULL_CHARGE_CAPACITY_CHARGE] = |
3ddca062 | 101 | SBS_DATA(POWER_SUPPLY_PROP_CHARGE_FULL, 0x10, 0, 65535), |
a7640bfa | 102 | [REG_TIME_TO_EMPTY] = |
3ddca062 | 103 | SBS_DATA(POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG, 0x12, 0, 65535), |
a7640bfa | 104 | [REG_TIME_TO_FULL] = |
3ddca062 | 105 | SBS_DATA(POWER_SUPPLY_PROP_TIME_TO_FULL_AVG, 0x13, 0, 65535), |
a7640bfa | 106 | [REG_STATUS] = |
3ddca062 | 107 | SBS_DATA(POWER_SUPPLY_PROP_STATUS, 0x16, 0, 65535), |
a7640bfa | 108 | [REG_CYCLE_COUNT] = |
3ddca062 | 109 | SBS_DATA(POWER_SUPPLY_PROP_CYCLE_COUNT, 0x17, 0, 65535), |
d3ab61ec | 110 | [REG_DESIGN_CAPACITY] = |
3ddca062 | 111 | SBS_DATA(POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN, 0x18, 0, 65535), |
51d07566 | 112 | [REG_DESIGN_CAPACITY_CHARGE] = |
3ddca062 | 113 | SBS_DATA(POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 0x18, 0, 65535), |
d3ab61ec | 114 | [REG_DESIGN_VOLTAGE] = |
3ddca062 | 115 | SBS_DATA(POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, 0x19, 0, 65535), |
a7640bfa | 116 | [REG_SERIAL_NUMBER] = |
3ddca062 | 117 | SBS_DATA(POWER_SUPPLY_PROP_SERIAL_NUMBER, 0x1C, 0, 65535), |
a7640bfa RK |
118 | }; |
119 | ||
3ddca062 | 120 | static enum power_supply_property sbs_properties[] = { |
a7640bfa RK |
121 | 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, | |
d3ab61ec RK |
133 | 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, | |
51d07566 RK |
137 | POWER_SUPPLY_PROP_CHARGE_NOW, |
138 | POWER_SUPPLY_PROP_CHARGE_FULL, | |
139 | POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, | |
a7640bfa RK |
140 | }; |
141 | ||
3ddca062 | 142 | struct sbs_info { |
bb879101 RK |
143 | struct i2c_client *client; |
144 | struct power_supply power_supply; | |
3ddca062 | 145 | struct sbs_platform_data *pdata; |
bb879101 RK |
146 | bool is_present; |
147 | bool gpio_detect; | |
148 | bool enable_detection; | |
149 | int irq; | |
58ddafae RK |
150 | int last_state; |
151 | int poll_time; | |
152 | struct delayed_work work; | |
153 | int ignore_changes; | |
a7640bfa RK |
154 | }; |
155 | ||
3ddca062 | 156 | static int sbs_read_word_data(struct i2c_client *client, u8 address) |
d3ab61ec | 157 | { |
3ddca062 | 158 | struct sbs_info *chip = i2c_get_clientdata(client); |
ff28fcef RK |
159 | s32 ret = 0; |
160 | int retries = 1; | |
161 | ||
3ddca062 RK |
162 | if (chip->pdata) |
163 | retries = max(chip->pdata->i2c_retry_count + 1, 1); | |
ff28fcef RK |
164 | |
165 | while (retries > 0) { | |
166 | ret = i2c_smbus_read_word_data(client, address); | |
167 | if (ret >= 0) | |
168 | break; | |
169 | retries--; | |
170 | } | |
d3ab61ec | 171 | |
d3ab61ec | 172 | if (ret < 0) { |
a7d9ace4 | 173 | dev_dbg(&client->dev, |
d3ab61ec RK |
174 | "%s: i2c read at address 0x%x failed\n", |
175 | __func__, address); | |
176 | return ret; | |
177 | } | |
ff28fcef | 178 | |
d3ab61ec RK |
179 | return le16_to_cpu(ret); |
180 | } | |
181 | ||
3ddca062 | 182 | static int sbs_write_word_data(struct i2c_client *client, u8 address, |
d3ab61ec RK |
183 | u16 value) |
184 | { | |
3ddca062 | 185 | struct sbs_info *chip = i2c_get_clientdata(client); |
ff28fcef RK |
186 | s32 ret = 0; |
187 | int retries = 1; | |
188 | ||
3ddca062 RK |
189 | if (chip->pdata) |
190 | retries = max(chip->pdata->i2c_retry_count + 1, 1); | |
ff28fcef RK |
191 | |
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 | } | |
d3ab61ec | 199 | |
d3ab61ec | 200 | if (ret < 0) { |
a7d9ace4 | 201 | dev_dbg(&client->dev, |
d3ab61ec RK |
202 | "%s: i2c write to address 0x%x failed\n", |
203 | __func__, address); | |
204 | return ret; | |
205 | } | |
ff28fcef | 206 | |
d3ab61ec RK |
207 | return 0; |
208 | } | |
209 | ||
3ddca062 | 210 | static int sbs_get_battery_presence_and_health( |
a7640bfa RK |
211 | struct i2c_client *client, enum power_supply_property psp, |
212 | union power_supply_propval *val) | |
213 | { | |
214 | s32 ret; | |
3ddca062 | 215 | struct sbs_info *chip = i2c_get_clientdata(client); |
bb879101 RK |
216 | |
217 | if (psp == POWER_SUPPLY_PROP_PRESENT && | |
3ddca062 RK |
218 | chip->gpio_detect) { |
219 | ret = gpio_get_value(chip->pdata->battery_detect); | |
220 | if (ret == chip->pdata->battery_detect_present) | |
bb879101 RK |
221 | val->intval = 1; |
222 | else | |
223 | val->intval = 0; | |
3ddca062 | 224 | chip->is_present = val->intval; |
bb879101 RK |
225 | return ret; |
226 | } | |
a7640bfa RK |
227 | |
228 | /* Write to ManufacturerAccess with | |
229 | * ManufacturerAccess command and then | |
230 | * read the status */ | |
3ddca062 RK |
231 | ret = sbs_write_word_data(client, sbs_data[REG_MANUFACTURER_DATA].addr, |
232 | MANUFACTURER_ACCESS_STATUS); | |
bb879101 RK |
233 | if (ret < 0) { |
234 | if (psp == POWER_SUPPLY_PROP_PRESENT) | |
235 | val->intval = 0; /* battery removed */ | |
d3ab61ec | 236 | return ret; |
bb879101 | 237 | } |
a7640bfa | 238 | |
3ddca062 | 239 | ret = sbs_read_word_data(client, sbs_data[REG_MANUFACTURER_DATA].addr); |
a7d9ace4 RK |
240 | if (ret < 0) |
241 | return ret; | |
242 | ||
3ddca062 RK |
243 | if (ret < sbs_data[REG_MANUFACTURER_DATA].min_value || |
244 | ret > sbs_data[REG_MANUFACTURER_DATA].max_value) { | |
a7640bfa RK |
245 | 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 | ||
3ddca062 | 274 | static int sbs_get_battery_property(struct i2c_client *client, |
a7640bfa RK |
275 | int reg_offset, enum power_supply_property psp, |
276 | union power_supply_propval *val) | |
277 | { | |
3ddca062 | 278 | struct sbs_info *chip = i2c_get_clientdata(client); |
a7640bfa RK |
279 | s32 ret; |
280 | ||
3ddca062 | 281 | ret = sbs_read_word_data(client, sbs_data[reg_offset].addr); |
d3ab61ec RK |
282 | if (ret < 0) |
283 | return ret; | |
284 | ||
285 | /* returned values are 16 bit */ | |
3ddca062 | 286 | if (sbs_data[reg_offset].min_value < 0) |
d3ab61ec | 287 | ret = (s16)ret; |
a7640bfa | 288 | |
3ddca062 RK |
289 | if (ret >= sbs_data[reg_offset].min_value && |
290 | ret <= sbs_data[reg_offset].max_value) { | |
a7640bfa | 291 | val->intval = ret; |
58ddafae RK |
292 | 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 | ||
3ddca062 RK |
304 | 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; | |
a7640bfa | 310 | } |
a7640bfa RK |
311 | } 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 | ||
3ddca062 | 321 | static void sbs_unit_adjustment(struct i2c_client *client, |
d3ab61ec RK |
322 | 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) | |
909a78b3 BL |
326 | #define TIME_UNIT_CONVERSION 60 |
327 | #define TEMP_KELVIN_TO_CELSIUS 2731 | |
d3ab61ec RK |
328 | switch (psp) { |
329 | case POWER_SUPPLY_PROP_ENERGY_NOW: | |
330 | case POWER_SUPPLY_PROP_ENERGY_FULL: | |
331 | case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN: | |
3ddca062 | 332 | /* sbs provides energy in units of 10mWh. |
909a78b3 BL |
333 | * Convert to µWh |
334 | */ | |
d3ab61ec RK |
335 | 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: | |
51d07566 RK |
341 | case POWER_SUPPLY_PROP_CHARGE_NOW: |
342 | case POWER_SUPPLY_PROP_CHARGE_FULL: | |
343 | case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: | |
d3ab61ec RK |
344 | val->intval *= BASE_UNIT_CONVERSION; |
345 | break; | |
346 | ||
347 | case POWER_SUPPLY_PROP_TEMP: | |
3ddca062 | 348 | /* sbs provides battery temperature in 0.1K |
909a78b3 BL |
349 | * so convert it to 0.1°C |
350 | */ | |
351 | val->intval -= TEMP_KELVIN_TO_CELSIUS; | |
d3ab61ec RK |
352 | break; |
353 | ||
354 | case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG: | |
355 | case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG: | |
3ddca062 | 356 | /* sbs provides time to empty and time to full in minutes. |
909a78b3 BL |
357 | * Convert to seconds |
358 | */ | |
d3ab61ec RK |
359 | 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 | ||
3ddca062 RK |
368 | static enum sbs_battery_mode sbs_set_battery_mode(struct i2c_client *client, |
369 | enum sbs_battery_mode mode) | |
51d07566 RK |
370 | { |
371 | int ret, original_val; | |
372 | ||
3ddca062 | 373 | original_val = sbs_read_word_data(client, BATTERY_MODE_OFFSET); |
51d07566 RK |
374 | 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 | ||
3ddca062 | 385 | ret = sbs_write_word_data(client, BATTERY_MODE_OFFSET, ret); |
51d07566 RK |
386 | if (ret < 0) |
387 | return ret; | |
388 | ||
389 | return original_val & BATTERY_MODE_MASK; | |
390 | } | |
391 | ||
3ddca062 | 392 | static int sbs_get_battery_capacity(struct i2c_client *client, |
d3ab61ec | 393 | int reg_offset, enum power_supply_property psp, |
a7640bfa RK |
394 | union power_supply_propval *val) |
395 | { | |
396 | s32 ret; | |
3ddca062 | 397 | enum sbs_battery_mode mode = BATTERY_MODE_WATTS; |
51d07566 RK |
398 | |
399 | if (power_supply_is_amp_property(psp)) | |
400 | mode = BATTERY_MODE_AMPS; | |
401 | ||
3ddca062 | 402 | mode = sbs_set_battery_mode(client, mode); |
51d07566 RK |
403 | if (mode < 0) |
404 | return mode; | |
a7640bfa | 405 | |
3ddca062 | 406 | ret = sbs_read_word_data(client, sbs_data[reg_offset].addr); |
d3ab61ec RK |
407 | if (ret < 0) |
408 | return ret; | |
a7640bfa | 409 | |
d3ab61ec | 410 | if (psp == POWER_SUPPLY_PROP_CAPACITY) { |
3ddca062 | 411 | /* sbs spec says that this can be >100 % |
d3ab61ec RK |
412 | * even if max value is 100 % */ |
413 | val->intval = min(ret, 100); | |
414 | } else | |
415 | val->intval = ret; | |
416 | ||
3ddca062 | 417 | ret = sbs_set_battery_mode(client, mode); |
51d07566 RK |
418 | if (ret < 0) |
419 | return ret; | |
420 | ||
d3ab61ec RK |
421 | return 0; |
422 | } | |
423 | ||
3ddca062 RK |
424 | static char sbs_serial[5]; |
425 | static int sbs_get_battery_serial_number(struct i2c_client *client, | |
d3ab61ec RK |
426 | union power_supply_propval *val) |
427 | { | |
428 | int ret; | |
429 | ||
3ddca062 | 430 | ret = sbs_read_word_data(client, sbs_data[REG_SERIAL_NUMBER].addr); |
d3ab61ec RK |
431 | if (ret < 0) |
432 | return ret; | |
433 | ||
3ddca062 RK |
434 | ret = sprintf(sbs_serial, "%04x", ret); |
435 | val->strval = sbs_serial; | |
a7640bfa RK |
436 | |
437 | return 0; | |
438 | } | |
439 | ||
3ddca062 | 440 | static int sbs_get_property_index(struct i2c_client *client, |
51d07566 RK |
441 | enum power_supply_property psp) |
442 | { | |
443 | int count; | |
3ddca062 RK |
444 | for (count = 0; count < ARRAY_SIZE(sbs_data); count++) |
445 | if (psp == sbs_data[count].psp) | |
51d07566 RK |
446 | return count; |
447 | ||
448 | dev_warn(&client->dev, | |
449 | "%s: Invalid Property - %d\n", __func__, psp); | |
450 | ||
451 | return -EINVAL; | |
452 | } | |
453 | ||
3ddca062 | 454 | static int sbs_get_property(struct power_supply *psy, |
a7640bfa RK |
455 | enum power_supply_property psp, |
456 | union power_supply_propval *val) | |
457 | { | |
bb879101 | 458 | int ret = 0; |
3ddca062 RK |
459 | struct sbs_info *chip = container_of(psy, |
460 | struct sbs_info, power_supply); | |
461 | struct i2c_client *client = chip->client; | |
a7640bfa RK |
462 | |
463 | switch (psp) { | |
464 | case POWER_SUPPLY_PROP_PRESENT: | |
465 | case POWER_SUPPLY_PROP_HEALTH: | |
3ddca062 | 466 | ret = sbs_get_battery_presence_and_health(client, psp, val); |
a7d9ace4 RK |
467 | if (psp == POWER_SUPPLY_PROP_PRESENT) |
468 | return 0; | |
a7640bfa RK |
469 | break; |
470 | ||
471 | case POWER_SUPPLY_PROP_TECHNOLOGY: | |
472 | val->intval = POWER_SUPPLY_TECHNOLOGY_LION; | |
5da50988 | 473 | goto done; /* don't trigger power_supply_changed()! */ |
a7640bfa | 474 | |
d3ab61ec RK |
475 | case POWER_SUPPLY_PROP_ENERGY_NOW: |
476 | case POWER_SUPPLY_PROP_ENERGY_FULL: | |
477 | case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN: | |
51d07566 RK |
478 | case POWER_SUPPLY_PROP_CHARGE_NOW: |
479 | case POWER_SUPPLY_PROP_CHARGE_FULL: | |
480 | case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: | |
a7640bfa | 481 | case POWER_SUPPLY_PROP_CAPACITY: |
3ddca062 | 482 | ret = sbs_get_property_index(client, psp); |
bb879101 RK |
483 | if (ret < 0) |
484 | break; | |
d3ab61ec | 485 | |
3ddca062 | 486 | ret = sbs_get_battery_capacity(client, ret, psp, val); |
d3ab61ec RK |
487 | break; |
488 | ||
489 | case POWER_SUPPLY_PROP_SERIAL_NUMBER: | |
3ddca062 | 490 | ret = sbs_get_battery_serial_number(client, val); |
a7640bfa RK |
491 | 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: | |
d3ab61ec | 500 | case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN: |
3ddca062 | 501 | ret = sbs_get_property_index(client, psp); |
bb879101 RK |
502 | if (ret < 0) |
503 | break; | |
d3ab61ec | 504 | |
3ddca062 | 505 | ret = sbs_get_battery_property(client, ret, psp, val); |
a7640bfa RK |
506 | break; |
507 | ||
508 | default: | |
509 | dev_err(&client->dev, | |
510 | "%s: INVALID property\n", __func__); | |
511 | return -EINVAL; | |
512 | } | |
513 | ||
3ddca062 | 514 | if (!chip->enable_detection) |
bb879101 RK |
515 | goto done; |
516 | ||
3ddca062 RK |
517 | if (!chip->gpio_detect && |
518 | chip->is_present != (ret >= 0)) { | |
519 | chip->is_present = (ret >= 0); | |
520 | power_supply_changed(&chip->power_supply); | |
bb879101 RK |
521 | } |
522 | ||
523 | done: | |
524 | if (!ret) { | |
525 | /* Convert units to match requirements for power supply class */ | |
3ddca062 | 526 | sbs_unit_adjustment(client, psp, val); |
bb879101 | 527 | } |
d3ab61ec | 528 | |
a7640bfa | 529 | dev_dbg(&client->dev, |
a7d9ace4 RK |
530 | "%s: property = %d, value = %x\n", __func__, psp, val->intval); |
531 | ||
3ddca062 | 532 | if (ret && chip->is_present) |
a7d9ace4 RK |
533 | return ret; |
534 | ||
535 | /* battery not present, so return NODATA for properties */ | |
536 | if (ret) | |
537 | return -ENODATA; | |
a7640bfa | 538 | |
a7d9ace4 | 539 | return 0; |
a7640bfa RK |
540 | } |
541 | ||
3ddca062 | 542 | static irqreturn_t sbs_irq(int irq, void *devid) |
bb879101 RK |
543 | { |
544 | struct power_supply *battery = devid; | |
545 | ||
546 | power_supply_changed(battery); | |
547 | ||
548 | return IRQ_HANDLED; | |
549 | } | |
550 | ||
3ddca062 | 551 | static void sbs_external_power_changed(struct power_supply *psy) |
58ddafae | 552 | { |
3ddca062 | 553 | struct sbs_info *chip; |
58ddafae | 554 | |
3ddca062 | 555 | chip = container_of(psy, struct sbs_info, power_supply); |
58ddafae | 556 | |
3ddca062 RK |
557 | if (chip->ignore_changes > 0) { |
558 | chip->ignore_changes--; | |
58ddafae RK |
559 | return; |
560 | } | |
561 | ||
562 | /* cancel outstanding work */ | |
3ddca062 | 563 | cancel_delayed_work_sync(&chip->work); |
58ddafae | 564 | |
3ddca062 RK |
565 | schedule_delayed_work(&chip->work, HZ); |
566 | chip->poll_time = chip->pdata->poll_retry_count; | |
58ddafae RK |
567 | } |
568 | ||
3ddca062 | 569 | static void sbs_delayed_work(struct work_struct *work) |
58ddafae | 570 | { |
3ddca062 | 571 | struct sbs_info *chip; |
58ddafae RK |
572 | s32 ret; |
573 | ||
3ddca062 | 574 | chip = container_of(work, struct sbs_info, work.work); |
58ddafae | 575 | |
3ddca062 | 576 | ret = sbs_read_word_data(chip->client, sbs_data[REG_STATUS].addr); |
58ddafae RK |
577 | /* if the read failed, give up on this work */ |
578 | if (ret < 0) { | |
3ddca062 | 579 | chip->poll_time = 0; |
58ddafae RK |
580 | 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 | ||
3ddca062 RK |
592 | if (chip->last_state != ret) { |
593 | chip->poll_time = 0; | |
594 | power_supply_changed(&chip->power_supply); | |
58ddafae RK |
595 | return; |
596 | } | |
3ddca062 RK |
597 | if (chip->poll_time > 0) { |
598 | schedule_delayed_work(&chip->work, HZ); | |
599 | chip->poll_time--; | |
58ddafae RK |
600 | return; |
601 | } | |
602 | } | |
603 | ||
6c75ea1e RK |
604 | #if defined(CONFIG_OF) |
605 | ||
606 | #include <linux/of_device.h> | |
607 | #include <linux/of_gpio.h> | |
608 | ||
3ddca062 RK |
609 | static const struct of_device_id sbs_dt_ids[] = { |
610 | { .compatible = "sbs,sbs-battery" }, | |
6c75ea1e RK |
611 | { .compatible = "ti,bq20z75" }, |
612 | { } | |
613 | }; | |
62df3935 | 614 | MODULE_DEVICE_TABLE(of, sbs_dt_ids); |
6c75ea1e | 615 | |
3ddca062 | 616 | static struct sbs_platform_data *sbs_of_populate_pdata( |
6c75ea1e RK |
617 | struct i2c_client *client) |
618 | { | |
619 | struct device_node *of_node = client->dev.of_node; | |
3ddca062 | 620 | struct sbs_platform_data *pdata = client->dev.platform_data; |
6c75ea1e RK |
621 | 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 | */ | |
3ddca062 RK |
636 | 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)) | |
6c75ea1e RK |
639 | goto of_out; |
640 | ||
3ddca062 | 641 | pdata = devm_kzalloc(&client->dev, sizeof(struct sbs_platform_data), |
6c75ea1e RK |
642 | GFP_KERNEL); |
643 | if (!pdata) | |
644 | goto of_out; | |
645 | ||
3ddca062 | 646 | rc = of_property_read_u32(of_node, "sbs,i2c-retry-count", &prop); |
6c75ea1e RK |
647 | if (!rc) |
648 | pdata->i2c_retry_count = prop; | |
649 | ||
3ddca062 | 650 | rc = of_property_read_u32(of_node, "sbs,poll-retry-count", &prop); |
6c75ea1e RK |
651 | if (!rc) |
652 | pdata->poll_retry_count = prop; | |
653 | ||
3ddca062 | 654 | if (!of_get_property(of_node, "sbs,battery-detect-gpios", NULL)) { |
6c75ea1e RK |
655 | pdata->battery_detect = -1; |
656 | goto of_out; | |
657 | } | |
658 | ||
659 | pdata->battery_detect = of_get_named_gpio_flags(of_node, | |
3ddca062 | 660 | "sbs,battery-detect-gpios", 0, &gpio_flags); |
6c75ea1e RK |
661 | |
662 | if (gpio_flags & OF_GPIO_ACTIVE_LOW) | |
663 | pdata->battery_detect_present = 0; | |
664 | else | |
665 | pdata->battery_detect_present = 1; | |
666 | ||
667 | of_out: | |
668 | return pdata; | |
669 | } | |
670 | #else | |
3ddca062 | 671 | static struct sbs_platform_data *sbs_of_populate_pdata( |
6c75ea1e RK |
672 | struct i2c_client *client) |
673 | { | |
674 | return client->dev.platform_data; | |
675 | } | |
676 | #endif | |
677 | ||
c8afa640 | 678 | static int sbs_probe(struct i2c_client *client, |
a7640bfa RK |
679 | const struct i2c_device_id *id) |
680 | { | |
3ddca062 RK |
681 | struct sbs_info *chip; |
682 | struct sbs_platform_data *pdata = client->dev.platform_data; | |
a7640bfa | 683 | int rc; |
bb879101 | 684 | int irq; |
52f56c69 | 685 | char *name; |
a7640bfa | 686 | |
52f56c69 RK |
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"); | |
a7640bfa | 690 | return -ENOMEM; |
52f56c69 RK |
691 | } |
692 | ||
693 | chip = kzalloc(sizeof(struct sbs_info), GFP_KERNEL); | |
694 | if (!chip) { | |
695 | rc = -ENOMEM; | |
696 | goto exit_free_name; | |
697 | } | |
a7640bfa | 698 | |
3ddca062 RK |
699 | chip->client = client; |
700 | chip->enable_detection = false; | |
701 | chip->gpio_detect = false; | |
52f56c69 | 702 | chip->power_supply.name = name; |
3ddca062 RK |
703 | 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; | |
89a22b1a | 707 | chip->power_supply.of_node = client->dev.of_node; |
58ddafae RK |
708 | /* ignore first notification of external change, it is generated |
709 | * from the power_supply_register call back | |
710 | */ | |
3ddca062 RK |
711 | chip->ignore_changes = 1; |
712 | chip->last_state = POWER_SUPPLY_STATUS_UNKNOWN; | |
713 | chip->power_supply.external_power_changed = sbs_external_power_changed; | |
a7640bfa | 714 | |
3ddca062 | 715 | pdata = sbs_of_populate_pdata(client); |
6c75ea1e | 716 | |
bb879101 | 717 | if (pdata) { |
3ddca062 RK |
718 | chip->gpio_detect = gpio_is_valid(pdata->battery_detect); |
719 | chip->pdata = pdata; | |
bb879101 RK |
720 | } |
721 | ||
3ddca062 | 722 | i2c_set_clientdata(client, chip); |
a7640bfa | 723 | |
3ddca062 | 724 | if (!chip->gpio_detect) |
bb879101 RK |
725 | goto skip_gpio; |
726 | ||
727 | rc = gpio_request(pdata->battery_detect, dev_name(&client->dev)); | |
728 | if (rc) { | |
729 | dev_warn(&client->dev, "Failed to request gpio: %d\n", rc); | |
3ddca062 | 730 | chip->gpio_detect = false; |
bb879101 RK |
731 | goto skip_gpio; |
732 | } | |
733 | ||
734 | rc = gpio_direction_input(pdata->battery_detect); | |
735 | if (rc) { | |
736 | dev_warn(&client->dev, "Failed to get gpio as input: %d\n", rc); | |
737 | gpio_free(pdata->battery_detect); | |
3ddca062 | 738 | chip->gpio_detect = false; |
bb879101 RK |
739 | goto skip_gpio; |
740 | } | |
741 | ||
742 | irq = gpio_to_irq(pdata->battery_detect); | |
743 | if (irq <= 0) { | |
744 | dev_warn(&client->dev, "Failed to get gpio as irq: %d\n", irq); | |
745 | gpio_free(pdata->battery_detect); | |
3ddca062 | 746 | chip->gpio_detect = false; |
bb879101 RK |
747 | goto skip_gpio; |
748 | } | |
749 | ||
3ddca062 | 750 | rc = request_irq(irq, sbs_irq, |
bb879101 | 751 | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, |
3ddca062 | 752 | dev_name(&client->dev), &chip->power_supply); |
bb879101 RK |
753 | if (rc) { |
754 | dev_warn(&client->dev, "Failed to request irq: %d\n", rc); | |
755 | gpio_free(pdata->battery_detect); | |
3ddca062 | 756 | chip->gpio_detect = false; |
bb879101 RK |
757 | goto skip_gpio; |
758 | } | |
759 | ||
3ddca062 | 760 | chip->irq = irq; |
bb879101 RK |
761 | |
762 | skip_gpio: | |
a22b41a3 OJ |
763 | /* |
764 | * Before we register, we need to make sure we can actually talk | |
765 | * to the battery. | |
766 | */ | |
767 | rc = sbs_read_word_data(client, sbs_data[REG_STATUS].addr); | |
768 | if (rc < 0) { | |
769 | dev_err(&client->dev, "%s: Failed to get device status\n", | |
770 | __func__); | |
771 | goto exit_psupply; | |
772 | } | |
bb879101 | 773 | |
3ddca062 | 774 | rc = power_supply_register(&client->dev, &chip->power_supply); |
a7640bfa RK |
775 | if (rc) { |
776 | dev_err(&client->dev, | |
777 | "%s: Failed to register power supply\n", __func__); | |
bb879101 | 778 | goto exit_psupply; |
a7640bfa RK |
779 | } |
780 | ||
781 | dev_info(&client->dev, | |
782 | "%s: battery gas gauge device registered\n", client->name); | |
783 | ||
3ddca062 | 784 | INIT_DELAYED_WORK(&chip->work, sbs_delayed_work); |
58ddafae | 785 | |
3ddca062 | 786 | chip->enable_detection = true; |
ee177d96 | 787 | |
a7640bfa | 788 | return 0; |
bb879101 RK |
789 | |
790 | exit_psupply: | |
3ddca062 RK |
791 | if (chip->irq) |
792 | free_irq(chip->irq, &chip->power_supply); | |
793 | if (chip->gpio_detect) | |
bb879101 RK |
794 | gpio_free(pdata->battery_detect); |
795 | ||
3ddca062 | 796 | kfree(chip); |
bb879101 | 797 | |
52f56c69 RK |
798 | exit_free_name: |
799 | kfree(name); | |
800 | ||
bb879101 | 801 | return rc; |
a7640bfa RK |
802 | } |
803 | ||
415ec69f | 804 | static int sbs_remove(struct i2c_client *client) |
a7640bfa | 805 | { |
3ddca062 | 806 | struct sbs_info *chip = i2c_get_clientdata(client); |
a7640bfa | 807 | |
3ddca062 RK |
808 | if (chip->irq) |
809 | free_irq(chip->irq, &chip->power_supply); | |
810 | if (chip->gpio_detect) | |
811 | gpio_free(chip->pdata->battery_detect); | |
bb879101 | 812 | |
3ddca062 | 813 | power_supply_unregister(&chip->power_supply); |
58ddafae | 814 | |
3ddca062 | 815 | cancel_delayed_work_sync(&chip->work); |
58ddafae | 816 | |
52f56c69 | 817 | kfree(chip->power_supply.name); |
3ddca062 RK |
818 | kfree(chip); |
819 | chip = NULL; | |
a7640bfa RK |
820 | |
821 | return 0; | |
822 | } | |
823 | ||
9c1d1af0 LPC |
824 | #if defined CONFIG_PM_SLEEP |
825 | ||
826 | static int sbs_suspend(struct device *dev) | |
a7640bfa | 827 | { |
9c1d1af0 | 828 | struct i2c_client *client = to_i2c_client(dev); |
3ddca062 | 829 | struct sbs_info *chip = i2c_get_clientdata(client); |
a7640bfa RK |
830 | s32 ret; |
831 | ||
3ddca062 RK |
832 | if (chip->poll_time > 0) |
833 | cancel_delayed_work_sync(&chip->work); | |
58ddafae | 834 | |
a7640bfa | 835 | /* write to manufacturer access with sleep command */ |
3ddca062 | 836 | ret = sbs_write_word_data(client, sbs_data[REG_MANUFACTURER_DATA].addr, |
a7640bfa | 837 | MANUFACTURER_ACCESS_SLEEP); |
3ddca062 | 838 | if (chip->is_present && ret < 0) |
d3ab61ec | 839 | return ret; |
a7640bfa RK |
840 | |
841 | return 0; | |
842 | } | |
9c1d1af0 LPC |
843 | |
844 | static SIMPLE_DEV_PM_OPS(sbs_pm_ops, sbs_suspend, NULL); | |
845 | #define SBS_PM_OPS (&sbs_pm_ops) | |
846 | ||
a7640bfa | 847 | #else |
9c1d1af0 | 848 | #define SBS_PM_OPS NULL |
a7640bfa | 849 | #endif |
a7640bfa | 850 | |
3ddca062 | 851 | static const struct i2c_device_id sbs_id[] = { |
a7640bfa | 852 | { "bq20z75", 0 }, |
3ddca062 | 853 | { "sbs-battery", 1 }, |
a7640bfa RK |
854 | {} |
855 | }; | |
3ddca062 RK |
856 | MODULE_DEVICE_TABLE(i2c, sbs_id); |
857 | ||
858 | static struct i2c_driver sbs_battery_driver = { | |
859 | .probe = sbs_probe, | |
28ea73f4 | 860 | .remove = sbs_remove, |
3ddca062 | 861 | .id_table = sbs_id, |
a7640bfa | 862 | .driver = { |
3ddca062 | 863 | .name = "sbs-battery", |
075ed03c | 864 | .of_match_table = of_match_ptr(sbs_dt_ids), |
9c1d1af0 | 865 | .pm = SBS_PM_OPS, |
a7640bfa RK |
866 | }, |
867 | }; | |
5ff92e7a | 868 | module_i2c_driver(sbs_battery_driver); |
a7640bfa | 869 | |
3ddca062 | 870 | MODULE_DESCRIPTION("SBS battery monitor driver"); |
a7640bfa | 871 | MODULE_LICENSE("GPL"); |