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sh_eth: fix EESIPR values for SH77{34|63}
[linux/fpc-iii.git] / drivers / power / supply / sbs-battery.c
blob8bb2eb38eb1c872e7a50f7aa765c9c4c712c79f1
1 /*
2 * Gas Gauge driver for SBS Compliant Batteries
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>
28 #include <linux/interrupt.h>
29 #include <linux/gpio/consumer.h>
30 #include <linux/of.h>
31 #include <linux/stat.h>
32
33 #include <linux/power/sbs-battery.h>
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,
44 REG_CAPACITY_LEVEL,
45 REG_CYCLE_COUNT,
46 REG_SERIAL_NUMBER,
47 REG_REMAINING_CAPACITY,
48 REG_REMAINING_CAPACITY_CHARGE,
49 REG_FULL_CHARGE_CAPACITY,
50 REG_FULL_CHARGE_CAPACITY_CHARGE,
51 REG_DESIGN_CAPACITY,
52 REG_DESIGN_CAPACITY_CHARGE,
53 REG_DESIGN_VOLTAGE_MIN,
54 REG_DESIGN_VOLTAGE_MAX,
55 REG_MANUFACTURER,
56 REG_MODEL_NAME,
57 };
58
59 /* Battery Mode defines */
60 #define BATTERY_MODE_OFFSET 0x03
61 #define BATTERY_MODE_MASK 0x8000
62 enum sbs_battery_mode {
63 BATTERY_MODE_AMPS,
64 BATTERY_MODE_WATTS
65 };
66
67 /* manufacturer access defines */
68 #define MANUFACTURER_ACCESS_STATUS 0x0006
69 #define MANUFACTURER_ACCESS_SLEEP 0x0011
70
71 /* battery status value bits */
72 #define BATTERY_INITIALIZED 0x80
73 #define BATTERY_DISCHARGING 0x40
74 #define BATTERY_FULL_CHARGED 0x20
75 #define BATTERY_FULL_DISCHARGED 0x10
76
77 /* min_value and max_value are only valid for numerical data */
78 #define SBS_DATA(_psp, _addr, _min_value, _max_value) { \
79 .psp = _psp, \
80 .addr = _addr, \
81 .min_value = _min_value, \
82 .max_value = _max_value, \
83 }
84
85 static const struct chip_data {
86 enum power_supply_property psp;
87 u8 addr;
88 int min_value;
89 int max_value;
90 } sbs_data[] = {
91 [REG_MANUFACTURER_DATA] =
92 SBS_DATA(POWER_SUPPLY_PROP_PRESENT, 0x00, 0, 65535),
93 [REG_TEMPERATURE] =
94 SBS_DATA(POWER_SUPPLY_PROP_TEMP, 0x08, 0, 65535),
95 [REG_VOLTAGE] =
96 SBS_DATA(POWER_SUPPLY_PROP_VOLTAGE_NOW, 0x09, 0, 20000),
97 [REG_CURRENT] =
98 SBS_DATA(POWER_SUPPLY_PROP_CURRENT_NOW, 0x0A, -32768, 32767),
99 [REG_CAPACITY] =
100 SBS_DATA(POWER_SUPPLY_PROP_CAPACITY, 0x0D, 0, 100),
101 [REG_REMAINING_CAPACITY] =
102 SBS_DATA(POWER_SUPPLY_PROP_ENERGY_NOW, 0x0F, 0, 65535),
103 [REG_REMAINING_CAPACITY_CHARGE] =
104 SBS_DATA(POWER_SUPPLY_PROP_CHARGE_NOW, 0x0F, 0, 65535),
105 [REG_FULL_CHARGE_CAPACITY] =
106 SBS_DATA(POWER_SUPPLY_PROP_ENERGY_FULL, 0x10, 0, 65535),
107 [REG_FULL_CHARGE_CAPACITY_CHARGE] =
108 SBS_DATA(POWER_SUPPLY_PROP_CHARGE_FULL, 0x10, 0, 65535),
109 [REG_TIME_TO_EMPTY] =
110 SBS_DATA(POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG, 0x12, 0, 65535),
111 [REG_TIME_TO_FULL] =
112 SBS_DATA(POWER_SUPPLY_PROP_TIME_TO_FULL_AVG, 0x13, 0, 65535),
113 [REG_STATUS] =
114 SBS_DATA(POWER_SUPPLY_PROP_STATUS, 0x16, 0, 65535),
115 [REG_CAPACITY_LEVEL] =
116 SBS_DATA(POWER_SUPPLY_PROP_CAPACITY_LEVEL, 0x16, 0, 65535),
117 [REG_CYCLE_COUNT] =
118 SBS_DATA(POWER_SUPPLY_PROP_CYCLE_COUNT, 0x17, 0, 65535),
119 [REG_DESIGN_CAPACITY] =
120 SBS_DATA(POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN, 0x18, 0, 65535),
121 [REG_DESIGN_CAPACITY_CHARGE] =
122 SBS_DATA(POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 0x18, 0, 65535),
123 [REG_DESIGN_VOLTAGE_MIN] =
124 SBS_DATA(POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 0x19, 0, 65535),
125 [REG_DESIGN_VOLTAGE_MAX] =
126 SBS_DATA(POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, 0x19, 0, 65535),
127 [REG_SERIAL_NUMBER] =
128 SBS_DATA(POWER_SUPPLY_PROP_SERIAL_NUMBER, 0x1C, 0, 65535),
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)
134 };
135
136 static enum power_supply_property sbs_properties[] = {
137 POWER_SUPPLY_PROP_STATUS,
138 POWER_SUPPLY_PROP_CAPACITY_LEVEL,
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,
150 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
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,
155 POWER_SUPPLY_PROP_CHARGE_NOW,
156 POWER_SUPPLY_PROP_CHARGE_FULL,
157 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
158 /* Properties of type `const char *' */
159 POWER_SUPPLY_PROP_MANUFACTURER,
160 POWER_SUPPLY_PROP_MODEL_NAME
161 };
162
163 struct sbs_info {
164 struct i2c_client *client;
165 struct power_supply *power_supply;
166 bool is_present;
167 struct gpio_desc *gpio_detect;
168 bool enable_detection;
169 int last_state;
170 int poll_time;
171 u32 i2c_retry_count;
172 u32 poll_retry_count;
173 struct delayed_work work;
174 int ignore_changes;
175 };
176
177 static char model_name[I2C_SMBUS_BLOCK_MAX + 1];
178 static char manufacturer[I2C_SMBUS_BLOCK_MAX + 1];
179 static bool force_load;
180
181 static int sbs_read_word_data(struct i2c_client *client, u8 address)
182 {
183 struct sbs_info *chip = i2c_get_clientdata(client);
184 s32 ret = 0;
185 int retries = 1;
186
187 retries = chip->i2c_retry_count;
188
189 while (retries > 0) {
190 ret = i2c_smbus_read_word_data(client, address);
191 if (ret >= 0)
192 break;
193 retries--;
194 }
195
196 if (ret < 0) {
197 dev_dbg(&client->dev,
198 "%s: i2c read at address 0x%x failed\n",
199 __func__, address);
200 return ret;
201 }
202
203 return le16_to_cpu(ret);
204 }
205
206 static int sbs_read_string_data(struct i2c_client *client, u8 address,
207 char *values)
208 {
209 struct sbs_info *chip = i2c_get_clientdata(client);
210 s32 ret = 0, block_length = 0;
211 int retries_length = 1, retries_block = 1;
212 u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1];
213
214 retries_length = chip->i2c_retry_count;
215 retries_block = chip->i2c_retry_count;
216
217 /* Adapter needs to support these two functions */
218 if (!i2c_check_functionality(client->adapter,
219 I2C_FUNC_SMBUS_BYTE_DATA |
220 I2C_FUNC_SMBUS_I2C_BLOCK)){
221 return -ENODEV;
222 }
223
224 /* Get the length of block data */
225 while (retries_length > 0) {
226 ret = i2c_smbus_read_byte_data(client, address);
227 if (ret >= 0)
228 break;
229 retries_length--;
230 }
231
232 if (ret < 0) {
233 dev_dbg(&client->dev,
234 "%s: i2c read at address 0x%x failed\n",
235 __func__, address);
236 return ret;
237 }
238
239 /* block_length does not include NULL terminator */
240 block_length = ret;
241 if (block_length > I2C_SMBUS_BLOCK_MAX) {
242 dev_err(&client->dev,
243 "%s: Returned block_length is longer than 0x%x\n",
244 __func__, I2C_SMBUS_BLOCK_MAX);
245 return -EINVAL;
246 }
247
248 /* Get the block data */
249 while (retries_block > 0) {
250 ret = i2c_smbus_read_i2c_block_data(
251 client, address,
252 block_length + 1, block_buffer);
253 if (ret >= 0)
254 break;
255 retries_block--;
256 }
257
258 if (ret < 0) {
259 dev_dbg(&client->dev,
260 "%s: i2c read at address 0x%x failed\n",
261 __func__, address);
262 return ret;
263 }
264
265 /* block_buffer[0] == block_length */
266 memcpy(values, block_buffer + 1, block_length);
267 values[block_length] = '\0';
268
269 return le16_to_cpu(ret);
270 }
271
272 static int sbs_write_word_data(struct i2c_client *client, u8 address,
273 u16 value)
274 {
275 struct sbs_info *chip = i2c_get_clientdata(client);
276 s32 ret = 0;
277 int retries = 1;
278
279 retries = chip->i2c_retry_count;
280
281 while (retries > 0) {
282 ret = i2c_smbus_write_word_data(client, address,
283 le16_to_cpu(value));
284 if (ret >= 0)
285 break;
286 retries--;
287 }
288
289 if (ret < 0) {
290 dev_dbg(&client->dev,
291 "%s: i2c write to address 0x%x failed\n",
292 __func__, address);
293 return ret;
294 }
295
296 return 0;
297 }
298
299 static int sbs_get_battery_presence_and_health(
300 struct i2c_client *client, enum power_supply_property psp,
301 union power_supply_propval *val)
302 {
303 s32 ret;
304 struct sbs_info *chip = i2c_get_clientdata(client);
305
306 if (psp == POWER_SUPPLY_PROP_PRESENT && chip->gpio_detect) {
307 ret = gpiod_get_value_cansleep(chip->gpio_detect);
308 if (ret < 0)
309 return ret;
310 val->intval = ret;
311 chip->is_present = val->intval;
312 return ret;
313 }
314
315 /*
316 * Write to ManufacturerAccess with ManufacturerAccess command
317 * and then read the status. Do not check for error on the write
318 * since not all batteries implement write access to this command,
319 * while others mandate it.
320 */
321 sbs_write_word_data(client, sbs_data[REG_MANUFACTURER_DATA].addr,
322 MANUFACTURER_ACCESS_STATUS);
323
324 ret = sbs_read_word_data(client, sbs_data[REG_MANUFACTURER_DATA].addr);
325 if (ret < 0) {
326 if (psp == POWER_SUPPLY_PROP_PRESENT)
327 val->intval = 0; /* battery removed */
328 return ret;
329 }
330
331 if (ret < sbs_data[REG_MANUFACTURER_DATA].min_value ||
332 ret > sbs_data[REG_MANUFACTURER_DATA].max_value) {
333 val->intval = 0;
334 return 0;
335 }
336
337 /* Mask the upper nibble of 2nd byte and
338 * lower byte of response then
339 * shift the result by 8 to get status*/
340 ret &= 0x0F00;
341 ret >>= 8;
342 if (psp == POWER_SUPPLY_PROP_PRESENT) {
343 if (ret == 0x0F)
344 /* battery removed */
345 val->intval = 0;
346 else
347 val->intval = 1;
348 } else if (psp == POWER_SUPPLY_PROP_HEALTH) {
349 if (ret == 0x09)
350 val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
351 else if (ret == 0x0B)
352 val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
353 else if (ret == 0x0C)
354 val->intval = POWER_SUPPLY_HEALTH_DEAD;
355 else
356 val->intval = POWER_SUPPLY_HEALTH_GOOD;
357 }
358
359 return 0;
360 }
361
362 static int sbs_get_battery_property(struct i2c_client *client,
363 int reg_offset, enum power_supply_property psp,
364 union power_supply_propval *val)
365 {
366 struct sbs_info *chip = i2c_get_clientdata(client);
367 s32 ret;
368
369 ret = sbs_read_word_data(client, sbs_data[reg_offset].addr);
370 if (ret < 0)
371 return ret;
372
373 /* returned values are 16 bit */
374 if (sbs_data[reg_offset].min_value < 0)
375 ret = (s16)ret;
376
377 if (ret >= sbs_data[reg_offset].min_value &&
378 ret <= sbs_data[reg_offset].max_value) {
379 val->intval = ret;
380 if (psp == POWER_SUPPLY_PROP_CAPACITY_LEVEL) {
381 if (!(ret & BATTERY_INITIALIZED))
382 val->intval =
383 POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN;
384 else if (ret & BATTERY_FULL_CHARGED)
385 val->intval =
386 POWER_SUPPLY_CAPACITY_LEVEL_FULL;
387 else if (ret & BATTERY_FULL_DISCHARGED)
388 val->intval =
389 POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
390 else
391 val->intval =
392 POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
393 return 0;
394 } else if (psp != POWER_SUPPLY_PROP_STATUS) {
395 return 0;
396 }
397
398 if (ret & BATTERY_FULL_CHARGED)
399 val->intval = POWER_SUPPLY_STATUS_FULL;
400 else if (ret & BATTERY_DISCHARGING)
401 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
402 else
403 val->intval = POWER_SUPPLY_STATUS_CHARGING;
404
405 if (chip->poll_time == 0)
406 chip->last_state = val->intval;
407 else if (chip->last_state != val->intval) {
408 cancel_delayed_work_sync(&chip->work);
409 power_supply_changed(chip->power_supply);
410 chip->poll_time = 0;
411 }
412 } else {
413 if (psp == POWER_SUPPLY_PROP_STATUS)
414 val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
415 else
416 val->intval = 0;
417 }
418
419 return 0;
420 }
421
422 static int sbs_get_battery_string_property(struct i2c_client *client,
423 int reg_offset, enum power_supply_property psp, char *val)
424 {
425 s32 ret;
426
427 ret = sbs_read_string_data(client, sbs_data[reg_offset].addr, val);
428
429 if (ret < 0)
430 return ret;
431
432 return 0;
433 }
434
435 static void sbs_unit_adjustment(struct i2c_client *client,
436 enum power_supply_property psp, union power_supply_propval *val)
437 {
438 #define BASE_UNIT_CONVERSION 1000
439 #define BATTERY_MODE_CAP_MULT_WATT (10 * BASE_UNIT_CONVERSION)
440 #define TIME_UNIT_CONVERSION 60
441 #define TEMP_KELVIN_TO_CELSIUS 2731
442 switch (psp) {
443 case POWER_SUPPLY_PROP_ENERGY_NOW:
444 case POWER_SUPPLY_PROP_ENERGY_FULL:
445 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
446 /* sbs provides energy in units of 10mWh.
447 * Convert to µWh
448 */
449 val->intval *= BATTERY_MODE_CAP_MULT_WATT;
450 break;
451
452 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
453 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
454 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
455 case POWER_SUPPLY_PROP_CURRENT_NOW:
456 case POWER_SUPPLY_PROP_CHARGE_NOW:
457 case POWER_SUPPLY_PROP_CHARGE_FULL:
458 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
459 val->intval *= BASE_UNIT_CONVERSION;
460 break;
461
462 case POWER_SUPPLY_PROP_TEMP:
463 /* sbs provides battery temperature in 0.1K
464 * so convert it to 0.1°C
465 */
466 val->intval -= TEMP_KELVIN_TO_CELSIUS;
467 break;
468
469 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
470 case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG:
471 /* sbs provides time to empty and time to full in minutes.
472 * Convert to seconds
473 */
474 val->intval *= TIME_UNIT_CONVERSION;
475 break;
476
477 default:
478 dev_dbg(&client->dev,
479 "%s: no need for unit conversion %d\n", __func__, psp);
480 }
481 }
482
483 static enum sbs_battery_mode sbs_set_battery_mode(struct i2c_client *client,
484 enum sbs_battery_mode mode)
485 {
486 int ret, original_val;
487
488 original_val = sbs_read_word_data(client, BATTERY_MODE_OFFSET);
489 if (original_val < 0)
490 return original_val;
491
492 if ((original_val & BATTERY_MODE_MASK) == mode)
493 return mode;
494
495 if (mode == BATTERY_MODE_AMPS)
496 ret = original_val & ~BATTERY_MODE_MASK;
497 else
498 ret = original_val | BATTERY_MODE_MASK;
499
500 ret = sbs_write_word_data(client, BATTERY_MODE_OFFSET, ret);
501 if (ret < 0)
502 return ret;
503
504 return original_val & BATTERY_MODE_MASK;
505 }
506
507 static int sbs_get_battery_capacity(struct i2c_client *client,
508 int reg_offset, enum power_supply_property psp,
509 union power_supply_propval *val)
510 {
511 s32 ret;
512 enum sbs_battery_mode mode = BATTERY_MODE_WATTS;
513
514 if (power_supply_is_amp_property(psp))
515 mode = BATTERY_MODE_AMPS;
516
517 mode = sbs_set_battery_mode(client, mode);
518 if (mode < 0)
519 return mode;
520
521 ret = sbs_read_word_data(client, sbs_data[reg_offset].addr);
522 if (ret < 0)
523 return ret;
524
525 if (psp == POWER_SUPPLY_PROP_CAPACITY) {
526 /* sbs spec says that this can be >100 %
527 * even if max value is 100 % */
528 val->intval = min(ret, 100);
529 } else
530 val->intval = ret;
531
532 ret = sbs_set_battery_mode(client, mode);
533 if (ret < 0)
534 return ret;
535
536 return 0;
537 }
538
539 static char sbs_serial[5];
540 static int sbs_get_battery_serial_number(struct i2c_client *client,
541 union power_supply_propval *val)
542 {
543 int ret;
544
545 ret = sbs_read_word_data(client, sbs_data[REG_SERIAL_NUMBER].addr);
546 if (ret < 0)
547 return ret;
548
549 ret = sprintf(sbs_serial, "%04x", ret);
550 val->strval = sbs_serial;
551
552 return 0;
553 }
554
555 static int sbs_get_property_index(struct i2c_client *client,
556 enum power_supply_property psp)
557 {
558 int count;
559 for (count = 0; count < ARRAY_SIZE(sbs_data); count++)
560 if (psp == sbs_data[count].psp)
561 return count;
562
563 dev_warn(&client->dev,
564 "%s: Invalid Property - %d\n", __func__, psp);
565
566 return -EINVAL;
567 }
568
569 static int sbs_get_property(struct power_supply *psy,
570 enum power_supply_property psp,
571 union power_supply_propval *val)
572 {
573 int ret = 0;
574 struct sbs_info *chip = power_supply_get_drvdata(psy);
575 struct i2c_client *client = chip->client;
576
577 switch (psp) {
578 case POWER_SUPPLY_PROP_PRESENT:
579 case POWER_SUPPLY_PROP_HEALTH:
580 ret = sbs_get_battery_presence_and_health(client, psp, val);
581 if (psp == POWER_SUPPLY_PROP_PRESENT)
582 return 0;
583 break;
584
585 case POWER_SUPPLY_PROP_TECHNOLOGY:
586 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
587 goto done; /* don't trigger power_supply_changed()! */
588
589 case POWER_SUPPLY_PROP_ENERGY_NOW:
590 case POWER_SUPPLY_PROP_ENERGY_FULL:
591 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
592 case POWER_SUPPLY_PROP_CHARGE_NOW:
593 case POWER_SUPPLY_PROP_CHARGE_FULL:
594 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
595 case POWER_SUPPLY_PROP_CAPACITY:
596 ret = sbs_get_property_index(client, psp);
597 if (ret < 0)
598 break;
599
600 ret = sbs_get_battery_capacity(client, ret, psp, val);
601 break;
602
603 case POWER_SUPPLY_PROP_SERIAL_NUMBER:
604 ret = sbs_get_battery_serial_number(client, val);
605 break;
606
607 case POWER_SUPPLY_PROP_STATUS:
608 case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
609 case POWER_SUPPLY_PROP_CYCLE_COUNT:
610 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
611 case POWER_SUPPLY_PROP_CURRENT_NOW:
612 case POWER_SUPPLY_PROP_TEMP:
613 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
614 case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG:
615 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
616 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
617 ret = sbs_get_property_index(client, psp);
618 if (ret < 0)
619 break;
620
621 ret = sbs_get_battery_property(client, ret, psp, val);
622 break;
623
624 case POWER_SUPPLY_PROP_MODEL_NAME:
625 ret = sbs_get_property_index(client, psp);
626 if (ret < 0)
627 break;
628
629 ret = sbs_get_battery_string_property(client, ret, psp,
630 model_name);
631 val->strval = model_name;
632 break;
633
634 case POWER_SUPPLY_PROP_MANUFACTURER:
635 ret = sbs_get_property_index(client, psp);
636 if (ret < 0)
637 break;
638
639 ret = sbs_get_battery_string_property(client, ret, psp,
640 manufacturer);
641 val->strval = manufacturer;
642 break;
643
644 default:
645 dev_err(&client->dev,
646 "%s: INVALID property\n", __func__);
647 return -EINVAL;
648 }
649
650 if (!chip->enable_detection)
651 goto done;
652
653 if (!chip->gpio_detect &&
654 chip->is_present != (ret >= 0)) {
655 chip->is_present = (ret >= 0);
656 power_supply_changed(chip->power_supply);
657 }
658
659 done:
660 if (!ret) {
661 /* Convert units to match requirements for power supply class */
662 sbs_unit_adjustment(client, psp, val);
663 }
664
665 dev_dbg(&client->dev,
666 "%s: property = %d, value = %x\n", __func__, psp, val->intval);
667
668 if (ret && chip->is_present)
669 return ret;
670
671 /* battery not present, so return NODATA for properties */
672 if (ret)
673 return -ENODATA;
674
675 return 0;
676 }
677
678 static irqreturn_t sbs_irq(int irq, void *devid)
679 {
680 struct sbs_info *chip = devid;
681 struct power_supply *battery = chip->power_supply;
682 int ret;
683
684 ret = gpiod_get_value_cansleep(chip->gpio_detect);
685 if (ret < 0)
686 return ret;
687 chip->is_present = ret;
688 power_supply_changed(battery);
689
690 return IRQ_HANDLED;
691 }
692
693 static void sbs_external_power_changed(struct power_supply *psy)
694 {
695 struct sbs_info *chip = power_supply_get_drvdata(psy);
696
697 if (chip->ignore_changes > 0) {
698 chip->ignore_changes--;
699 return;
700 }
701
702 /* cancel outstanding work */
703 cancel_delayed_work_sync(&chip->work);
704
705 schedule_delayed_work(&chip->work, HZ);
706 chip->poll_time = chip->poll_retry_count;
707 }
708
709 static void sbs_delayed_work(struct work_struct *work)
710 {
711 struct sbs_info *chip;
712 s32 ret;
713
714 chip = container_of(work, struct sbs_info, work.work);
715
716 ret = sbs_read_word_data(chip->client, sbs_data[REG_STATUS].addr);
717 /* if the read failed, give up on this work */
718 if (ret < 0) {
719 chip->poll_time = 0;
720 return;
721 }
722
723 if (ret & BATTERY_FULL_CHARGED)
724 ret = POWER_SUPPLY_STATUS_FULL;
725 else if (ret & BATTERY_DISCHARGING)
726 ret = POWER_SUPPLY_STATUS_DISCHARGING;
727 else
728 ret = POWER_SUPPLY_STATUS_CHARGING;
729
730 if (chip->last_state != ret) {
731 chip->poll_time = 0;
732 power_supply_changed(chip->power_supply);
733 return;
734 }
735 if (chip->poll_time > 0) {
736 schedule_delayed_work(&chip->work, HZ);
737 chip->poll_time--;
738 return;
739 }
740 }
741
742 static const struct power_supply_desc sbs_default_desc = {
743 .type = POWER_SUPPLY_TYPE_BATTERY,
744 .properties = sbs_properties,
745 .num_properties = ARRAY_SIZE(sbs_properties),
746 .get_property = sbs_get_property,
747 .external_power_changed = sbs_external_power_changed,
748 };
749
750 static int sbs_probe(struct i2c_client *client,
751 const struct i2c_device_id *id)
752 {
753 struct sbs_info *chip;
754 struct power_supply_desc *sbs_desc;
755 struct sbs_platform_data *pdata = client->dev.platform_data;
756 struct power_supply_config psy_cfg = {};
757 int rc;
758 int irq;
759
760 sbs_desc = devm_kmemdup(&client->dev, &sbs_default_desc,
761 sizeof(*sbs_desc), GFP_KERNEL);
762 if (!sbs_desc)
763 return -ENOMEM;
764
765 sbs_desc->name = devm_kasprintf(&client->dev, GFP_KERNEL, "sbs-%s",
766 dev_name(&client->dev));
767 if (!sbs_desc->name)
768 return -ENOMEM;
769
770 chip = devm_kzalloc(&client->dev, sizeof(struct sbs_info), GFP_KERNEL);
771 if (!chip)
772 return -ENOMEM;
773
774 chip->client = client;
775 chip->enable_detection = false;
776 psy_cfg.of_node = client->dev.of_node;
777 psy_cfg.drv_data = chip;
778 /* ignore first notification of external change, it is generated
779 * from the power_supply_register call back
780 */
781 chip->ignore_changes = 1;
782 chip->last_state = POWER_SUPPLY_STATUS_UNKNOWN;
783
784 /* use pdata if available, fall back to DT properties,
785 * or hardcoded defaults if not
786 */
787 rc = of_property_read_u32(client->dev.of_node, "sbs,i2c-retry-count",
788 &chip->i2c_retry_count);
789 if (rc)
790 chip->i2c_retry_count = 0;
791
792 rc = of_property_read_u32(client->dev.of_node, "sbs,poll-retry-count",
793 &chip->poll_retry_count);
794 if (rc)
795 chip->poll_retry_count = 0;
796
797 if (pdata) {
798 chip->poll_retry_count = pdata->poll_retry_count;
799 chip->i2c_retry_count = pdata->i2c_retry_count;
800 }
801 chip->i2c_retry_count = chip->i2c_retry_count + 1;
802
803 chip->gpio_detect = devm_gpiod_get_optional(&client->dev,
804 "sbs,battery-detect", GPIOD_IN);
805 if (IS_ERR(chip->gpio_detect)) {
806 dev_err(&client->dev, "Failed to get gpio: %ld\n",
807 PTR_ERR(chip->gpio_detect));
808 return PTR_ERR(chip->gpio_detect);
809 }
810
811 i2c_set_clientdata(client, chip);
812
813 if (!chip->gpio_detect)
814 goto skip_gpio;
815
816 irq = gpiod_to_irq(chip->gpio_detect);
817 if (irq <= 0) {
818 dev_warn(&client->dev, "Failed to get gpio as irq: %d\n", irq);
819 goto skip_gpio;
820 }
821
822 rc = devm_request_threaded_irq(&client->dev, irq, NULL, sbs_irq,
823 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
824 dev_name(&client->dev), chip);
825 if (rc) {
826 dev_warn(&client->dev, "Failed to request irq: %d\n", rc);
827 goto skip_gpio;
828 }
829
830 skip_gpio:
831 /*
832 * Before we register, we might need to make sure we can actually talk
833 * to the battery.
834 */
835 if (!(force_load || chip->gpio_detect)) {
836 rc = sbs_read_word_data(client, sbs_data[REG_STATUS].addr);
837
838 if (rc < 0) {
839 dev_err(&client->dev, "%s: Failed to get device status\n",
840 __func__);
841 goto exit_psupply;
842 }
843 }
844
845 chip->power_supply = devm_power_supply_register(&client->dev, sbs_desc,
846 &psy_cfg);
847 if (IS_ERR(chip->power_supply)) {
848 dev_err(&client->dev,
849 "%s: Failed to register power supply\n", __func__);
850 rc = PTR_ERR(chip->power_supply);
851 goto exit_psupply;
852 }
853
854 dev_info(&client->dev,
855 "%s: battery gas gauge device registered\n", client->name);
856
857 INIT_DELAYED_WORK(&chip->work, sbs_delayed_work);
858
859 chip->enable_detection = true;
860
861 return 0;
862
863 exit_psupply:
864 return rc;
865 }
866
867 static int sbs_remove(struct i2c_client *client)
868 {
869 struct sbs_info *chip = i2c_get_clientdata(client);
870
871 cancel_delayed_work_sync(&chip->work);
872
873 return 0;
874 }
875
876 #if defined CONFIG_PM_SLEEP
877
878 static int sbs_suspend(struct device *dev)
879 {
880 struct i2c_client *client = to_i2c_client(dev);
881 struct sbs_info *chip = i2c_get_clientdata(client);
882
883 if (chip->poll_time > 0)
884 cancel_delayed_work_sync(&chip->work);
885
886 /*
887 * Write to manufacturer access with sleep command.
888 * Support is manufacturer dependend, so ignore errors.
889 */
890 sbs_write_word_data(client, sbs_data[REG_MANUFACTURER_DATA].addr,
891 MANUFACTURER_ACCESS_SLEEP);
892
893 return 0;
894 }
895
896 static SIMPLE_DEV_PM_OPS(sbs_pm_ops, sbs_suspend, NULL);
897 #define SBS_PM_OPS (&sbs_pm_ops)
898
899 #else
900 #define SBS_PM_OPS NULL
901 #endif
902
903 static const struct i2c_device_id sbs_id[] = {
904 { "bq20z75", 0 },
905 { "sbs-battery", 1 },
906 {}
907 };
908 MODULE_DEVICE_TABLE(i2c, sbs_id);
909
910 static const struct of_device_id sbs_dt_ids[] = {
911 { .compatible = "sbs,sbs-battery" },
912 { .compatible = "ti,bq20z75" },
913 { }
914 };
915 MODULE_DEVICE_TABLE(of, sbs_dt_ids);
916
917 static struct i2c_driver sbs_battery_driver = {
918 .probe = sbs_probe,
919 .remove = sbs_remove,
920 .id_table = sbs_id,
921 .driver = {
922 .name = "sbs-battery",
923 .of_match_table = sbs_dt_ids,
924 .pm = SBS_PM_OPS,
925 },
926 };
927 module_i2c_driver(sbs_battery_driver);
928
929 MODULE_DESCRIPTION("SBS battery monitor driver");
930 MODULE_LICENSE("GPL");
931
932 module_param(force_load, bool, S_IRUSR | S_IRGRP | S_IROTH);
933 MODULE_PARM_DESC(force_load,
934 "Attempt to load the driver even if no battery is connected");
Linux with added FPC-III support