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power: supply: sbs-battery: Use gpio_desc and sleeping calls for battery detect
[deliverable/linux.git] / drivers / power / supply / sbs-battery.c
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 struct sbs_platform_data *pdata;
167 bool is_present;
168 struct gpio_desc *gpio_detect;
169 bool enable_detection;
170 int last_state;
171 int poll_time;
172 struct delayed_work work;
173 int ignore_changes;
174 };
175
176 static char model_name[I2C_SMBUS_BLOCK_MAX + 1];
177 static char manufacturer[I2C_SMBUS_BLOCK_MAX + 1];
178 static bool force_load;
179
180 static int sbs_read_word_data(struct i2c_client *client, u8 address)
181 {
182 struct sbs_info *chip = i2c_get_clientdata(client);
183 s32 ret = 0;
184 int retries = 1;
185
186 if (chip->pdata)
187 retries = max(chip->pdata->i2c_retry_count + 1, 1);
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 if (chip->pdata) {
215 retries_length = max(chip->pdata->i2c_retry_count + 1, 1);
216 retries_block = max(chip->pdata->i2c_retry_count + 1, 1);
217 }
218
219 /* Adapter needs to support these two functions */
220 if (!i2c_check_functionality(client->adapter,
221 I2C_FUNC_SMBUS_BYTE_DATA |
222 I2C_FUNC_SMBUS_I2C_BLOCK)){
223 return -ENODEV;
224 }
225
226 /* Get the length of block data */
227 while (retries_length > 0) {
228 ret = i2c_smbus_read_byte_data(client, address);
229 if (ret >= 0)
230 break;
231 retries_length--;
232 }
233
234 if (ret < 0) {
235 dev_dbg(&client->dev,
236 "%s: i2c read at address 0x%x failed\n",
237 __func__, address);
238 return ret;
239 }
240
241 /* block_length does not include NULL terminator */
242 block_length = ret;
243 if (block_length > I2C_SMBUS_BLOCK_MAX) {
244 dev_err(&client->dev,
245 "%s: Returned block_length is longer than 0x%x\n",
246 __func__, I2C_SMBUS_BLOCK_MAX);
247 return -EINVAL;
248 }
249
250 /* Get the block data */
251 while (retries_block > 0) {
252 ret = i2c_smbus_read_i2c_block_data(
253 client, address,
254 block_length + 1, block_buffer);
255 if (ret >= 0)
256 break;
257 retries_block--;
258 }
259
260 if (ret < 0) {
261 dev_dbg(&client->dev,
262 "%s: i2c read at address 0x%x failed\n",
263 __func__, address);
264 return ret;
265 }
266
267 /* block_buffer[0] == block_length */
268 memcpy(values, block_buffer + 1, block_length);
269 values[block_length] = '\0';
270
271 return le16_to_cpu(ret);
272 }
273
274 static int sbs_write_word_data(struct i2c_client *client, u8 address,
275 u16 value)
276 {
277 struct sbs_info *chip = i2c_get_clientdata(client);
278 s32 ret = 0;
279 int retries = 1;
280
281 if (chip->pdata)
282 retries = max(chip->pdata->i2c_retry_count + 1, 1);
283
284 while (retries > 0) {
285 ret = i2c_smbus_write_word_data(client, address,
286 le16_to_cpu(value));
287 if (ret >= 0)
288 break;
289 retries--;
290 }
291
292 if (ret < 0) {
293 dev_dbg(&client->dev,
294 "%s: i2c write to address 0x%x failed\n",
295 __func__, address);
296 return ret;
297 }
298
299 return 0;
300 }
301
302 static int sbs_get_battery_presence_and_health(
303 struct i2c_client *client, enum power_supply_property psp,
304 union power_supply_propval *val)
305 {
306 s32 ret;
307 struct sbs_info *chip = i2c_get_clientdata(client);
308
309 if (psp == POWER_SUPPLY_PROP_PRESENT && chip->gpio_detect) {
310 ret = gpiod_get_value_cansleep(chip->gpio_detect);
311 if (ret < 0)
312 return ret;
313 val->intval = ret;
314 chip->is_present = val->intval;
315 return ret;
316 }
317
318 /* Write to ManufacturerAccess with
319 * ManufacturerAccess command and then
320 * read the status */
321 ret = sbs_write_word_data(client, sbs_data[REG_MANUFACTURER_DATA].addr,
322 MANUFACTURER_ACCESS_STATUS);
323 if (ret < 0) {
324 if (psp == POWER_SUPPLY_PROP_PRESENT)
325 val->intval = 0; /* battery removed */
326 return ret;
327 }
328
329 ret = sbs_read_word_data(client, sbs_data[REG_MANUFACTURER_DATA].addr);
330 if (ret < 0)
331 return ret;
332
333 if (ret < sbs_data[REG_MANUFACTURER_DATA].min_value ||
334 ret > sbs_data[REG_MANUFACTURER_DATA].max_value) {
335 val->intval = 0;
336 return 0;
337 }
338
339 /* Mask the upper nibble of 2nd byte and
340 * lower byte of response then
341 * shift the result by 8 to get status*/
342 ret &= 0x0F00;
343 ret >>= 8;
344 if (psp == POWER_SUPPLY_PROP_PRESENT) {
345 if (ret == 0x0F)
346 /* battery removed */
347 val->intval = 0;
348 else
349 val->intval = 1;
350 } else if (psp == POWER_SUPPLY_PROP_HEALTH) {
351 if (ret == 0x09)
352 val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
353 else if (ret == 0x0B)
354 val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
355 else if (ret == 0x0C)
356 val->intval = POWER_SUPPLY_HEALTH_DEAD;
357 else
358 val->intval = POWER_SUPPLY_HEALTH_GOOD;
359 }
360
361 return 0;
362 }
363
364 static int sbs_get_battery_property(struct i2c_client *client,
365 int reg_offset, enum power_supply_property psp,
366 union power_supply_propval *val)
367 {
368 struct sbs_info *chip = i2c_get_clientdata(client);
369 s32 ret;
370
371 ret = sbs_read_word_data(client, sbs_data[reg_offset].addr);
372 if (ret < 0)
373 return ret;
374
375 /* returned values are 16 bit */
376 if (sbs_data[reg_offset].min_value < 0)
377 ret = (s16)ret;
378
379 if (ret >= sbs_data[reg_offset].min_value &&
380 ret <= sbs_data[reg_offset].max_value) {
381 val->intval = ret;
382 if (psp == POWER_SUPPLY_PROP_CAPACITY_LEVEL) {
383 if (!(ret & BATTERY_INITIALIZED))
384 val->intval =
385 POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN;
386 else if (ret & BATTERY_FULL_CHARGED)
387 val->intval =
388 POWER_SUPPLY_CAPACITY_LEVEL_FULL;
389 else if (ret & BATTERY_FULL_DISCHARGED)
390 val->intval =
391 POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
392 else
393 val->intval =
394 POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
395 return 0;
396 } else if (psp != POWER_SUPPLY_PROP_STATUS) {
397 return 0;
398 }
399
400 if (ret & BATTERY_FULL_CHARGED)
401 val->intval = POWER_SUPPLY_STATUS_FULL;
402 else if (ret & BATTERY_DISCHARGING)
403 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
404 else
405 val->intval = POWER_SUPPLY_STATUS_CHARGING;
406
407 if (chip->poll_time == 0)
408 chip->last_state = val->intval;
409 else if (chip->last_state != val->intval) {
410 cancel_delayed_work_sync(&chip->work);
411 power_supply_changed(chip->power_supply);
412 chip->poll_time = 0;
413 }
414 } else {
415 if (psp == POWER_SUPPLY_PROP_STATUS)
416 val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
417 else
418 val->intval = 0;
419 }
420
421 return 0;
422 }
423
424 static int sbs_get_battery_string_property(struct i2c_client *client,
425 int reg_offset, enum power_supply_property psp, char *val)
426 {
427 s32 ret;
428
429 ret = sbs_read_string_data(client, sbs_data[reg_offset].addr, val);
430
431 if (ret < 0)
432 return ret;
433
434 return 0;
435 }
436
437 static void sbs_unit_adjustment(struct i2c_client *client,
438 enum power_supply_property psp, union power_supply_propval *val)
439 {
440 #define BASE_UNIT_CONVERSION 1000
441 #define BATTERY_MODE_CAP_MULT_WATT (10 * BASE_UNIT_CONVERSION)
442 #define TIME_UNIT_CONVERSION 60
443 #define TEMP_KELVIN_TO_CELSIUS 2731
444 switch (psp) {
445 case POWER_SUPPLY_PROP_ENERGY_NOW:
446 case POWER_SUPPLY_PROP_ENERGY_FULL:
447 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
448 /* sbs provides energy in units of 10mWh.
449 * Convert to µWh
450 */
451 val->intval *= BATTERY_MODE_CAP_MULT_WATT;
452 break;
453
454 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
455 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
456 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
457 case POWER_SUPPLY_PROP_CURRENT_NOW:
458 case POWER_SUPPLY_PROP_CHARGE_NOW:
459 case POWER_SUPPLY_PROP_CHARGE_FULL:
460 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
461 val->intval *= BASE_UNIT_CONVERSION;
462 break;
463
464 case POWER_SUPPLY_PROP_TEMP:
465 /* sbs provides battery temperature in 0.1K
466 * so convert it to 0.1°C
467 */
468 val->intval -= TEMP_KELVIN_TO_CELSIUS;
469 break;
470
471 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
472 case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG:
473 /* sbs provides time to empty and time to full in minutes.
474 * Convert to seconds
475 */
476 val->intval *= TIME_UNIT_CONVERSION;
477 break;
478
479 default:
480 dev_dbg(&client->dev,
481 "%s: no need for unit conversion %d\n", __func__, psp);
482 }
483 }
484
485 static enum sbs_battery_mode sbs_set_battery_mode(struct i2c_client *client,
486 enum sbs_battery_mode mode)
487 {
488 int ret, original_val;
489
490 original_val = sbs_read_word_data(client, BATTERY_MODE_OFFSET);
491 if (original_val < 0)
492 return original_val;
493
494 if ((original_val & BATTERY_MODE_MASK) == mode)
495 return mode;
496
497 if (mode == BATTERY_MODE_AMPS)
498 ret = original_val & ~BATTERY_MODE_MASK;
499 else
500 ret = original_val | BATTERY_MODE_MASK;
501
502 ret = sbs_write_word_data(client, BATTERY_MODE_OFFSET, ret);
503 if (ret < 0)
504 return ret;
505
506 return original_val & BATTERY_MODE_MASK;
507 }
508
509 static int sbs_get_battery_capacity(struct i2c_client *client,
510 int reg_offset, enum power_supply_property psp,
511 union power_supply_propval *val)
512 {
513 s32 ret;
514 enum sbs_battery_mode mode = BATTERY_MODE_WATTS;
515
516 if (power_supply_is_amp_property(psp))
517 mode = BATTERY_MODE_AMPS;
518
519 mode = sbs_set_battery_mode(client, mode);
520 if (mode < 0)
521 return mode;
522
523 ret = sbs_read_word_data(client, sbs_data[reg_offset].addr);
524 if (ret < 0)
525 return ret;
526
527 if (psp == POWER_SUPPLY_PROP_CAPACITY) {
528 /* sbs spec says that this can be >100 %
529 * even if max value is 100 % */
530 val->intval = min(ret, 100);
531 } else
532 val->intval = ret;
533
534 ret = sbs_set_battery_mode(client, mode);
535 if (ret < 0)
536 return ret;
537
538 return 0;
539 }
540
541 static char sbs_serial[5];
542 static int sbs_get_battery_serial_number(struct i2c_client *client,
543 union power_supply_propval *val)
544 {
545 int ret;
546
547 ret = sbs_read_word_data(client, sbs_data[REG_SERIAL_NUMBER].addr);
548 if (ret < 0)
549 return ret;
550
551 ret = sprintf(sbs_serial, "%04x", ret);
552 val->strval = sbs_serial;
553
554 return 0;
555 }
556
557 static int sbs_get_property_index(struct i2c_client *client,
558 enum power_supply_property psp)
559 {
560 int count;
561 for (count = 0; count < ARRAY_SIZE(sbs_data); count++)
562 if (psp == sbs_data[count].psp)
563 return count;
564
565 dev_warn(&client->dev,
566 "%s: Invalid Property - %d\n", __func__, psp);
567
568 return -EINVAL;
569 }
570
571 static int sbs_get_property(struct power_supply *psy,
572 enum power_supply_property psp,
573 union power_supply_propval *val)
574 {
575 int ret = 0;
576 struct sbs_info *chip = power_supply_get_drvdata(psy);
577 struct i2c_client *client = chip->client;
578
579 switch (psp) {
580 case POWER_SUPPLY_PROP_PRESENT:
581 case POWER_SUPPLY_PROP_HEALTH:
582 ret = sbs_get_battery_presence_and_health(client, psp, val);
583 if (psp == POWER_SUPPLY_PROP_PRESENT)
584 return 0;
585 break;
586
587 case POWER_SUPPLY_PROP_TECHNOLOGY:
588 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
589 goto done; /* don't trigger power_supply_changed()! */
590
591 case POWER_SUPPLY_PROP_ENERGY_NOW:
592 case POWER_SUPPLY_PROP_ENERGY_FULL:
593 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
594 case POWER_SUPPLY_PROP_CHARGE_NOW:
595 case POWER_SUPPLY_PROP_CHARGE_FULL:
596 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
597 case POWER_SUPPLY_PROP_CAPACITY:
598 ret = sbs_get_property_index(client, psp);
599 if (ret < 0)
600 break;
601
602 ret = sbs_get_battery_capacity(client, ret, psp, val);
603 break;
604
605 case POWER_SUPPLY_PROP_SERIAL_NUMBER:
606 ret = sbs_get_battery_serial_number(client, val);
607 break;
608
609 case POWER_SUPPLY_PROP_STATUS:
610 case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
611 case POWER_SUPPLY_PROP_CYCLE_COUNT:
612 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
613 case POWER_SUPPLY_PROP_CURRENT_NOW:
614 case POWER_SUPPLY_PROP_TEMP:
615 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
616 case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG:
617 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
618 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
619 ret = sbs_get_property_index(client, psp);
620 if (ret < 0)
621 break;
622
623 ret = sbs_get_battery_property(client, ret, psp, val);
624 break;
625
626 case POWER_SUPPLY_PROP_MODEL_NAME:
627 ret = sbs_get_property_index(client, psp);
628 if (ret < 0)
629 break;
630
631 ret = sbs_get_battery_string_property(client, ret, psp,
632 model_name);
633 val->strval = model_name;
634 break;
635
636 case POWER_SUPPLY_PROP_MANUFACTURER:
637 ret = sbs_get_property_index(client, psp);
638 if (ret < 0)
639 break;
640
641 ret = sbs_get_battery_string_property(client, ret, psp,
642 manufacturer);
643 val->strval = manufacturer;
644 break;
645
646 default:
647 dev_err(&client->dev,
648 "%s: INVALID property\n", __func__);
649 return -EINVAL;
650 }
651
652 if (!chip->enable_detection)
653 goto done;
654
655 if (!chip->gpio_detect &&
656 chip->is_present != (ret >= 0)) {
657 chip->is_present = (ret >= 0);
658 power_supply_changed(chip->power_supply);
659 }
660
661 done:
662 if (!ret) {
663 /* Convert units to match requirements for power supply class */
664 sbs_unit_adjustment(client, psp, val);
665 }
666
667 dev_dbg(&client->dev,
668 "%s: property = %d, value = %x\n", __func__, psp, val->intval);
669
670 if (ret && chip->is_present)
671 return ret;
672
673 /* battery not present, so return NODATA for properties */
674 if (ret)
675 return -ENODATA;
676
677 return 0;
678 }
679
680 static irqreturn_t sbs_irq(int irq, void *devid)
681 {
682 struct sbs_info *chip = devid;
683 struct power_supply *battery = chip->power_supply;
684 int ret;
685
686 ret = gpiod_get_value_cansleep(chip->gpio_detect);
687 if (ret < 0)
688 return ret;
689 chip->is_present = ret;
690 power_supply_changed(battery);
691
692 return IRQ_HANDLED;
693 }
694
695 static void sbs_external_power_changed(struct power_supply *psy)
696 {
697 struct sbs_info *chip = power_supply_get_drvdata(psy);
698
699 if (chip->ignore_changes > 0) {
700 chip->ignore_changes--;
701 return;
702 }
703
704 /* cancel outstanding work */
705 cancel_delayed_work_sync(&chip->work);
706
707 schedule_delayed_work(&chip->work, HZ);
708 chip->poll_time = chip->pdata->poll_retry_count;
709 }
710
711 static void sbs_delayed_work(struct work_struct *work)
712 {
713 struct sbs_info *chip;
714 s32 ret;
715
716 chip = container_of(work, struct sbs_info, work.work);
717
718 ret = sbs_read_word_data(chip->client, sbs_data[REG_STATUS].addr);
719 /* if the read failed, give up on this work */
720 if (ret < 0) {
721 chip->poll_time = 0;
722 return;
723 }
724
725 if (ret & BATTERY_FULL_CHARGED)
726 ret = POWER_SUPPLY_STATUS_FULL;
727 else if (ret & BATTERY_DISCHARGING)
728 ret = POWER_SUPPLY_STATUS_DISCHARGING;
729 else
730 ret = POWER_SUPPLY_STATUS_CHARGING;
731
732 if (chip->last_state != ret) {
733 chip->poll_time = 0;
734 power_supply_changed(chip->power_supply);
735 return;
736 }
737 if (chip->poll_time > 0) {
738 schedule_delayed_work(&chip->work, HZ);
739 chip->poll_time--;
740 return;
741 }
742 }
743
744 #if defined(CONFIG_OF)
745
746 #include <linux/of_device.h>
747 #include <linux/of_gpio.h>
748
749 static const struct of_device_id sbs_dt_ids[] = {
750 { .compatible = "sbs,sbs-battery" },
751 { .compatible = "ti,bq20z75" },
752 { }
753 };
754 MODULE_DEVICE_TABLE(of, sbs_dt_ids);
755
756 static struct sbs_platform_data *sbs_of_populate_pdata(struct sbs_info *chip)
757 {
758 struct i2c_client *client = chip->client;
759 struct device_node *of_node = client->dev.of_node;
760 struct sbs_platform_data *pdata;
761 int rc;
762 u32 prop;
763
764 /* verify this driver matches this device */
765 if (!of_node)
766 return NULL;
767
768 /* first make sure at least one property is set, otherwise
769 * it won't change behavior from running without pdata.
770 */
771 if (!of_get_property(of_node, "sbs,i2c-retry-count", NULL) &&
772 !of_get_property(of_node, "sbs,poll-retry-count", NULL))
773 goto of_out;
774
775 pdata = devm_kzalloc(&client->dev, sizeof(struct sbs_platform_data),
776 GFP_KERNEL);
777 if (!pdata)
778 return ERR_PTR(-ENOMEM);
779
780 rc = of_property_read_u32(of_node, "sbs,i2c-retry-count", &prop);
781 if (!rc)
782 pdata->i2c_retry_count = prop;
783
784 rc = of_property_read_u32(of_node, "sbs,poll-retry-count", &prop);
785 if (!rc)
786 pdata->poll_retry_count = prop;
787
788 of_out:
789 return pdata;
790 }
791 #else
792 static struct sbs_platform_data *sbs_of_populate_pdata(
793 struct sbs_info *client)
794 {
795 return ERR_PTR(-ENOSYS);
796 }
797 #endif
798
799 static const struct power_supply_desc sbs_default_desc = {
800 .type = POWER_SUPPLY_TYPE_BATTERY,
801 .properties = sbs_properties,
802 .num_properties = ARRAY_SIZE(sbs_properties),
803 .get_property = sbs_get_property,
804 .external_power_changed = sbs_external_power_changed,
805 };
806
807 static int sbs_probe(struct i2c_client *client,
808 const struct i2c_device_id *id)
809 {
810 struct sbs_info *chip;
811 struct power_supply_desc *sbs_desc;
812 struct sbs_platform_data *pdata = client->dev.platform_data;
813 struct power_supply_config psy_cfg = {};
814 int rc;
815 int irq;
816
817 sbs_desc = devm_kmemdup(&client->dev, &sbs_default_desc,
818 sizeof(*sbs_desc), GFP_KERNEL);
819 if (!sbs_desc)
820 return -ENOMEM;
821
822 sbs_desc->name = devm_kasprintf(&client->dev, GFP_KERNEL, "sbs-%s",
823 dev_name(&client->dev));
824 if (!sbs_desc->name)
825 return -ENOMEM;
826
827 chip = devm_kzalloc(&client->dev, sizeof(struct sbs_info), GFP_KERNEL);
828 if (!chip)
829 return -ENOMEM;
830
831 chip->client = client;
832 chip->enable_detection = false;
833 psy_cfg.of_node = client->dev.of_node;
834 psy_cfg.drv_data = chip;
835 /* ignore first notification of external change, it is generated
836 * from the power_supply_register call back
837 */
838 chip->ignore_changes = 1;
839 chip->last_state = POWER_SUPPLY_STATUS_UNKNOWN;
840
841 if (!pdata)
842 pdata = sbs_of_populate_pdata(chip);
843
844 if (IS_ERR(pdata))
845 return PTR_ERR(pdata);
846
847 chip->pdata = pdata;
848
849 chip->gpio_detect = devm_gpiod_get_optional(&client->dev,
850 "sbs,battery-detect", GPIOD_IN);
851 if (IS_ERR(chip->gpio_detect)) {
852 dev_err(&client->dev, "Failed to get gpio: %ld\n",
853 PTR_ERR(chip->gpio_detect));
854 return PTR_ERR(chip->gpio_detect);
855 }
856
857 i2c_set_clientdata(client, chip);
858
859 if (!chip->gpio_detect)
860 goto skip_gpio;
861
862 irq = gpiod_to_irq(chip->gpio_detect);
863 if (irq <= 0) {
864 dev_warn(&client->dev, "Failed to get gpio as irq: %d\n", irq);
865 goto skip_gpio;
866 }
867
868 rc = devm_request_threaded_irq(&client->dev, irq, NULL, sbs_irq,
869 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
870 dev_name(&client->dev), chip);
871 if (rc) {
872 dev_warn(&client->dev, "Failed to request irq: %d\n", rc);
873 goto skip_gpio;
874 }
875
876 skip_gpio:
877 /*
878 * Before we register, we might need to make sure we can actually talk
879 * to the battery.
880 */
881 if (!(force_load || chip->gpio_detect)) {
882 rc = sbs_read_word_data(client, sbs_data[REG_STATUS].addr);
883
884 if (rc < 0) {
885 dev_err(&client->dev, "%s: Failed to get device status\n",
886 __func__);
887 goto exit_psupply;
888 }
889 }
890
891 chip->power_supply = devm_power_supply_register(&client->dev, sbs_desc,
892 &psy_cfg);
893 if (IS_ERR(chip->power_supply)) {
894 dev_err(&client->dev,
895 "%s: Failed to register power supply\n", __func__);
896 rc = PTR_ERR(chip->power_supply);
897 goto exit_psupply;
898 }
899
900 dev_info(&client->dev,
901 "%s: battery gas gauge device registered\n", client->name);
902
903 INIT_DELAYED_WORK(&chip->work, sbs_delayed_work);
904
905 chip->enable_detection = true;
906
907 return 0;
908
909 exit_psupply:
910 return rc;
911 }
912
913 static int sbs_remove(struct i2c_client *client)
914 {
915 struct sbs_info *chip = i2c_get_clientdata(client);
916
917 cancel_delayed_work_sync(&chip->work);
918
919 return 0;
920 }
921
922 #if defined CONFIG_PM_SLEEP
923
924 static int sbs_suspend(struct device *dev)
925 {
926 struct i2c_client *client = to_i2c_client(dev);
927 struct sbs_info *chip = i2c_get_clientdata(client);
928 s32 ret;
929
930 if (chip->poll_time > 0)
931 cancel_delayed_work_sync(&chip->work);
932
933 /* write to manufacturer access with sleep command */
934 ret = sbs_write_word_data(client, sbs_data[REG_MANUFACTURER_DATA].addr,
935 MANUFACTURER_ACCESS_SLEEP);
936 if (chip->is_present && ret < 0)
937 return ret;
938
939 return 0;
940 }
941
942 static SIMPLE_DEV_PM_OPS(sbs_pm_ops, sbs_suspend, NULL);
943 #define SBS_PM_OPS (&sbs_pm_ops)
944
945 #else
946 #define SBS_PM_OPS NULL
947 #endif
948
949 static const struct i2c_device_id sbs_id[] = {
950 { "bq20z75", 0 },
951 { "sbs-battery", 1 },
952 {}
953 };
954 MODULE_DEVICE_TABLE(i2c, sbs_id);
955
956 static struct i2c_driver sbs_battery_driver = {
957 .probe = sbs_probe,
958 .remove = sbs_remove,
959 .id_table = sbs_id,
960 .driver = {
961 .name = "sbs-battery",
962 .of_match_table = of_match_ptr(sbs_dt_ids),
963 .pm = SBS_PM_OPS,
964 },
965 };
966 module_i2c_driver(sbs_battery_driver);
967
968 MODULE_DESCRIPTION("SBS battery monitor driver");
969 MODULE_LICENSE("GPL");
970
971 module_param(force_load, bool, S_IRUSR | S_IRGRP | S_IROTH);
972 MODULE_PARM_DESC(force_load,
973 "Attempt to load the driver even if no battery is connected");
Linux kernel - Deliverables
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