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selinux: fix overflow and 0 length allocations
[deliverable/linux.git] / drivers / power / 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.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_CYCLE_COUNT,
45 REG_SERIAL_NUMBER,
46 REG_REMAINING_CAPACITY,
47 REG_REMAINING_CAPACITY_CHARGE,
48 REG_FULL_CHARGE_CAPACITY,
49 REG_FULL_CHARGE_CAPACITY_CHARGE,
50 REG_DESIGN_CAPACITY,
51 REG_DESIGN_CAPACITY_CHARGE,
52 REG_DESIGN_VOLTAGE_MIN,
53 REG_DESIGN_VOLTAGE_MAX,
54 REG_MANUFACTURER,
55 REG_MODEL_NAME,
56 };
57
58 /* Battery Mode defines */
59 #define BATTERY_MODE_OFFSET 0x03
60 #define BATTERY_MODE_MASK 0x8000
61 enum sbs_battery_mode {
62 BATTERY_MODE_AMPS,
63 BATTERY_MODE_WATTS
64 };
65
66 /* manufacturer access defines */
67 #define MANUFACTURER_ACCESS_STATUS 0x0006
68 #define MANUFACTURER_ACCESS_SLEEP 0x0011
69
70 /* battery status value bits */
71 #define BATTERY_DISCHARGING 0x40
72 #define BATTERY_FULL_CHARGED 0x20
73 #define BATTERY_FULL_DISCHARGED 0x10
74
75 /* min_value and max_value are only valid for numerical data */
76 #define SBS_DATA(_psp, _addr, _min_value, _max_value) { \
77 .psp = _psp, \
78 .addr = _addr, \
79 .min_value = _min_value, \
80 .max_value = _max_value, \
81 }
82
83 static const struct chip_data {
84 enum power_supply_property psp;
85 u8 addr;
86 int min_value;
87 int max_value;
88 } sbs_data[] = {
89 [REG_MANUFACTURER_DATA] =
90 SBS_DATA(POWER_SUPPLY_PROP_PRESENT, 0x00, 0, 65535),
91 [REG_TEMPERATURE] =
92 SBS_DATA(POWER_SUPPLY_PROP_TEMP, 0x08, 0, 65535),
93 [REG_VOLTAGE] =
94 SBS_DATA(POWER_SUPPLY_PROP_VOLTAGE_NOW, 0x09, 0, 20000),
95 [REG_CURRENT] =
96 SBS_DATA(POWER_SUPPLY_PROP_CURRENT_NOW, 0x0A, -32768, 32767),
97 [REG_CAPACITY] =
98 SBS_DATA(POWER_SUPPLY_PROP_CAPACITY, 0x0D, 0, 100),
99 [REG_REMAINING_CAPACITY] =
100 SBS_DATA(POWER_SUPPLY_PROP_ENERGY_NOW, 0x0F, 0, 65535),
101 [REG_REMAINING_CAPACITY_CHARGE] =
102 SBS_DATA(POWER_SUPPLY_PROP_CHARGE_NOW, 0x0F, 0, 65535),
103 [REG_FULL_CHARGE_CAPACITY] =
104 SBS_DATA(POWER_SUPPLY_PROP_ENERGY_FULL, 0x10, 0, 65535),
105 [REG_FULL_CHARGE_CAPACITY_CHARGE] =
106 SBS_DATA(POWER_SUPPLY_PROP_CHARGE_FULL, 0x10, 0, 65535),
107 [REG_TIME_TO_EMPTY] =
108 SBS_DATA(POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG, 0x12, 0, 65535),
109 [REG_TIME_TO_FULL] =
110 SBS_DATA(POWER_SUPPLY_PROP_TIME_TO_FULL_AVG, 0x13, 0, 65535),
111 [REG_STATUS] =
112 SBS_DATA(POWER_SUPPLY_PROP_STATUS, 0x16, 0, 65535),
113 [REG_CYCLE_COUNT] =
114 SBS_DATA(POWER_SUPPLY_PROP_CYCLE_COUNT, 0x17, 0, 65535),
115 [REG_DESIGN_CAPACITY] =
116 SBS_DATA(POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN, 0x18, 0, 65535),
117 [REG_DESIGN_CAPACITY_CHARGE] =
118 SBS_DATA(POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 0x18, 0, 65535),
119 [REG_DESIGN_VOLTAGE_MIN] =
120 SBS_DATA(POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 0x19, 0, 65535),
121 [REG_DESIGN_VOLTAGE_MAX] =
122 SBS_DATA(POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, 0x19, 0, 65535),
123 [REG_SERIAL_NUMBER] =
124 SBS_DATA(POWER_SUPPLY_PROP_SERIAL_NUMBER, 0x1C, 0, 65535),
125 /* Properties of type `const char *' */
126 [REG_MANUFACTURER] =
127 SBS_DATA(POWER_SUPPLY_PROP_MANUFACTURER, 0x20, 0, 65535),
128 [REG_MODEL_NAME] =
129 SBS_DATA(POWER_SUPPLY_PROP_MODEL_NAME, 0x21, 0, 65535)
130 };
131
132 static enum power_supply_property sbs_properties[] = {
133 POWER_SUPPLY_PROP_STATUS,
134 POWER_SUPPLY_PROP_HEALTH,
135 POWER_SUPPLY_PROP_PRESENT,
136 POWER_SUPPLY_PROP_TECHNOLOGY,
137 POWER_SUPPLY_PROP_CYCLE_COUNT,
138 POWER_SUPPLY_PROP_VOLTAGE_NOW,
139 POWER_SUPPLY_PROP_CURRENT_NOW,
140 POWER_SUPPLY_PROP_CAPACITY,
141 POWER_SUPPLY_PROP_TEMP,
142 POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
143 POWER_SUPPLY_PROP_TIME_TO_FULL_AVG,
144 POWER_SUPPLY_PROP_SERIAL_NUMBER,
145 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
146 POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
147 POWER_SUPPLY_PROP_ENERGY_NOW,
148 POWER_SUPPLY_PROP_ENERGY_FULL,
149 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
150 POWER_SUPPLY_PROP_CHARGE_NOW,
151 POWER_SUPPLY_PROP_CHARGE_FULL,
152 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
153 /* Properties of type `const char *' */
154 POWER_SUPPLY_PROP_MANUFACTURER,
155 POWER_SUPPLY_PROP_MODEL_NAME
156 };
157
158 struct sbs_info {
159 struct i2c_client *client;
160 struct power_supply *power_supply;
161 struct sbs_platform_data *pdata;
162 bool is_present;
163 bool gpio_detect;
164 bool enable_detection;
165 int irq;
166 int last_state;
167 int poll_time;
168 struct delayed_work work;
169 int ignore_changes;
170 };
171
172 static char model_name[I2C_SMBUS_BLOCK_MAX + 1];
173 static char manufacturer[I2C_SMBUS_BLOCK_MAX + 1];
174 static bool force_load;
175
176 static int sbs_read_word_data(struct i2c_client *client, u8 address)
177 {
178 struct sbs_info *chip = i2c_get_clientdata(client);
179 s32 ret = 0;
180 int retries = 1;
181
182 if (chip->pdata)
183 retries = max(chip->pdata->i2c_retry_count + 1, 1);
184
185 while (retries > 0) {
186 ret = i2c_smbus_read_word_data(client, address);
187 if (ret >= 0)
188 break;
189 retries--;
190 }
191
192 if (ret < 0) {
193 dev_dbg(&client->dev,
194 "%s: i2c read at address 0x%x failed\n",
195 __func__, address);
196 return ret;
197 }
198
199 return le16_to_cpu(ret);
200 }
201
202 static int sbs_read_string_data(struct i2c_client *client, u8 address,
203 char *values)
204 {
205 struct sbs_info *chip = i2c_get_clientdata(client);
206 s32 ret = 0, block_length = 0;
207 int retries_length = 1, retries_block = 1;
208 u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1];
209
210 if (chip->pdata) {
211 retries_length = max(chip->pdata->i2c_retry_count + 1, 1);
212 retries_block = max(chip->pdata->i2c_retry_count + 1, 1);
213 }
214
215 /* Adapter needs to support these two functions */
216 if (!i2c_check_functionality(client->adapter,
217 I2C_FUNC_SMBUS_BYTE_DATA |
218 I2C_FUNC_SMBUS_I2C_BLOCK)){
219 return -ENODEV;
220 }
221
222 /* Get the length of block data */
223 while (retries_length > 0) {
224 ret = i2c_smbus_read_byte_data(client, address);
225 if (ret >= 0)
226 break;
227 retries_length--;
228 }
229
230 if (ret < 0) {
231 dev_dbg(&client->dev,
232 "%s: i2c read at address 0x%x failed\n",
233 __func__, address);
234 return ret;
235 }
236
237 /* block_length does not include NULL terminator */
238 block_length = ret;
239 if (block_length > I2C_SMBUS_BLOCK_MAX) {
240 dev_err(&client->dev,
241 "%s: Returned block_length is longer than 0x%x\n",
242 __func__, I2C_SMBUS_BLOCK_MAX);
243 return -EINVAL;
244 }
245
246 /* Get the block data */
247 while (retries_block > 0) {
248 ret = i2c_smbus_read_i2c_block_data(
249 client, address,
250 block_length + 1, block_buffer);
251 if (ret >= 0)
252 break;
253 retries_block--;
254 }
255
256 if (ret < 0) {
257 dev_dbg(&client->dev,
258 "%s: i2c read at address 0x%x failed\n",
259 __func__, address);
260 return ret;
261 }
262
263 /* block_buffer[0] == block_length */
264 memcpy(values, block_buffer + 1, block_length);
265 values[block_length] = '\0';
266
267 return le16_to_cpu(ret);
268 }
269
270 static int sbs_write_word_data(struct i2c_client *client, u8 address,
271 u16 value)
272 {
273 struct sbs_info *chip = i2c_get_clientdata(client);
274 s32 ret = 0;
275 int retries = 1;
276
277 if (chip->pdata)
278 retries = max(chip->pdata->i2c_retry_count + 1, 1);
279
280 while (retries > 0) {
281 ret = i2c_smbus_write_word_data(client, address,
282 le16_to_cpu(value));
283 if (ret >= 0)
284 break;
285 retries--;
286 }
287
288 if (ret < 0) {
289 dev_dbg(&client->dev,
290 "%s: i2c write to address 0x%x failed\n",
291 __func__, address);
292 return ret;
293 }
294
295 return 0;
296 }
297
298 static int sbs_get_battery_presence_and_health(
299 struct i2c_client *client, enum power_supply_property psp,
300 union power_supply_propval *val)
301 {
302 s32 ret;
303 struct sbs_info *chip = i2c_get_clientdata(client);
304
305 if (psp == POWER_SUPPLY_PROP_PRESENT &&
306 chip->gpio_detect) {
307 ret = gpio_get_value(chip->pdata->battery_detect);
308 if (ret == chip->pdata->battery_detect_present)
309 val->intval = 1;
310 else
311 val->intval = 0;
312 chip->is_present = val->intval;
313 return ret;
314 }
315
316 /* Write to ManufacturerAccess with
317 * ManufacturerAccess command and then
318 * read the status */
319 ret = sbs_write_word_data(client, sbs_data[REG_MANUFACTURER_DATA].addr,
320 MANUFACTURER_ACCESS_STATUS);
321 if (ret < 0) {
322 if (psp == POWER_SUPPLY_PROP_PRESENT)
323 val->intval = 0; /* battery removed */
324 return ret;
325 }
326
327 ret = sbs_read_word_data(client, sbs_data[REG_MANUFACTURER_DATA].addr);
328 if (ret < 0)
329 return ret;
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_STATUS)
381 return 0;
382
383 if (ret & BATTERY_FULL_CHARGED)
384 val->intval = POWER_SUPPLY_STATUS_FULL;
385 else if (ret & BATTERY_DISCHARGING)
386 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
387 else
388 val->intval = POWER_SUPPLY_STATUS_CHARGING;
389
390 if (chip->poll_time == 0)
391 chip->last_state = val->intval;
392 else if (chip->last_state != val->intval) {
393 cancel_delayed_work_sync(&chip->work);
394 power_supply_changed(chip->power_supply);
395 chip->poll_time = 0;
396 }
397 } else {
398 if (psp == POWER_SUPPLY_PROP_STATUS)
399 val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
400 else
401 val->intval = 0;
402 }
403
404 return 0;
405 }
406
407 static int sbs_get_battery_string_property(struct i2c_client *client,
408 int reg_offset, enum power_supply_property psp, char *val)
409 {
410 s32 ret;
411
412 ret = sbs_read_string_data(client, sbs_data[reg_offset].addr, val);
413
414 if (ret < 0)
415 return ret;
416
417 return 0;
418 }
419
420 static void sbs_unit_adjustment(struct i2c_client *client,
421 enum power_supply_property psp, union power_supply_propval *val)
422 {
423 #define BASE_UNIT_CONVERSION 1000
424 #define BATTERY_MODE_CAP_MULT_WATT (10 * BASE_UNIT_CONVERSION)
425 #define TIME_UNIT_CONVERSION 60
426 #define TEMP_KELVIN_TO_CELSIUS 2731
427 switch (psp) {
428 case POWER_SUPPLY_PROP_ENERGY_NOW:
429 case POWER_SUPPLY_PROP_ENERGY_FULL:
430 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
431 /* sbs provides energy in units of 10mWh.
432 * Convert to µWh
433 */
434 val->intval *= BATTERY_MODE_CAP_MULT_WATT;
435 break;
436
437 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
438 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
439 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
440 case POWER_SUPPLY_PROP_CURRENT_NOW:
441 case POWER_SUPPLY_PROP_CHARGE_NOW:
442 case POWER_SUPPLY_PROP_CHARGE_FULL:
443 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
444 val->intval *= BASE_UNIT_CONVERSION;
445 break;
446
447 case POWER_SUPPLY_PROP_TEMP:
448 /* sbs provides battery temperature in 0.1K
449 * so convert it to 0.1°C
450 */
451 val->intval -= TEMP_KELVIN_TO_CELSIUS;
452 break;
453
454 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
455 case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG:
456 /* sbs provides time to empty and time to full in minutes.
457 * Convert to seconds
458 */
459 val->intval *= TIME_UNIT_CONVERSION;
460 break;
461
462 default:
463 dev_dbg(&client->dev,
464 "%s: no need for unit conversion %d\n", __func__, psp);
465 }
466 }
467
468 static enum sbs_battery_mode sbs_set_battery_mode(struct i2c_client *client,
469 enum sbs_battery_mode mode)
470 {
471 int ret, original_val;
472
473 original_val = sbs_read_word_data(client, BATTERY_MODE_OFFSET);
474 if (original_val < 0)
475 return original_val;
476
477 if ((original_val & BATTERY_MODE_MASK) == mode)
478 return mode;
479
480 if (mode == BATTERY_MODE_AMPS)
481 ret = original_val & ~BATTERY_MODE_MASK;
482 else
483 ret = original_val | BATTERY_MODE_MASK;
484
485 ret = sbs_write_word_data(client, BATTERY_MODE_OFFSET, ret);
486 if (ret < 0)
487 return ret;
488
489 return original_val & BATTERY_MODE_MASK;
490 }
491
492 static int sbs_get_battery_capacity(struct i2c_client *client,
493 int reg_offset, enum power_supply_property psp,
494 union power_supply_propval *val)
495 {
496 s32 ret;
497 enum sbs_battery_mode mode = BATTERY_MODE_WATTS;
498
499 if (power_supply_is_amp_property(psp))
500 mode = BATTERY_MODE_AMPS;
501
502 mode = sbs_set_battery_mode(client, mode);
503 if (mode < 0)
504 return mode;
505
506 ret = sbs_read_word_data(client, sbs_data[reg_offset].addr);
507 if (ret < 0)
508 return ret;
509
510 if (psp == POWER_SUPPLY_PROP_CAPACITY) {
511 /* sbs spec says that this can be >100 %
512 * even if max value is 100 % */
513 val->intval = min(ret, 100);
514 } else
515 val->intval = ret;
516
517 ret = sbs_set_battery_mode(client, mode);
518 if (ret < 0)
519 return ret;
520
521 return 0;
522 }
523
524 static char sbs_serial[5];
525 static int sbs_get_battery_serial_number(struct i2c_client *client,
526 union power_supply_propval *val)
527 {
528 int ret;
529
530 ret = sbs_read_word_data(client, sbs_data[REG_SERIAL_NUMBER].addr);
531 if (ret < 0)
532 return ret;
533
534 ret = sprintf(sbs_serial, "%04x", ret);
535 val->strval = sbs_serial;
536
537 return 0;
538 }
539
540 static int sbs_get_property_index(struct i2c_client *client,
541 enum power_supply_property psp)
542 {
543 int count;
544 for (count = 0; count < ARRAY_SIZE(sbs_data); count++)
545 if (psp == sbs_data[count].psp)
546 return count;
547
548 dev_warn(&client->dev,
549 "%s: Invalid Property - %d\n", __func__, psp);
550
551 return -EINVAL;
552 }
553
554 static int sbs_get_property(struct power_supply *psy,
555 enum power_supply_property psp,
556 union power_supply_propval *val)
557 {
558 int ret = 0;
559 struct sbs_info *chip = power_supply_get_drvdata(psy);
560 struct i2c_client *client = chip->client;
561
562 switch (psp) {
563 case POWER_SUPPLY_PROP_PRESENT:
564 case POWER_SUPPLY_PROP_HEALTH:
565 ret = sbs_get_battery_presence_and_health(client, psp, val);
566 if (psp == POWER_SUPPLY_PROP_PRESENT)
567 return 0;
568 break;
569
570 case POWER_SUPPLY_PROP_TECHNOLOGY:
571 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
572 goto done; /* don't trigger power_supply_changed()! */
573
574 case POWER_SUPPLY_PROP_ENERGY_NOW:
575 case POWER_SUPPLY_PROP_ENERGY_FULL:
576 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
577 case POWER_SUPPLY_PROP_CHARGE_NOW:
578 case POWER_SUPPLY_PROP_CHARGE_FULL:
579 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
580 case POWER_SUPPLY_PROP_CAPACITY:
581 ret = sbs_get_property_index(client, psp);
582 if (ret < 0)
583 break;
584
585 ret = sbs_get_battery_capacity(client, ret, psp, val);
586 break;
587
588 case POWER_SUPPLY_PROP_SERIAL_NUMBER:
589 ret = sbs_get_battery_serial_number(client, val);
590 break;
591
592 case POWER_SUPPLY_PROP_STATUS:
593 case POWER_SUPPLY_PROP_CYCLE_COUNT:
594 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
595 case POWER_SUPPLY_PROP_CURRENT_NOW:
596 case POWER_SUPPLY_PROP_TEMP:
597 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
598 case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG:
599 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
600 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
601 ret = sbs_get_property_index(client, psp);
602 if (ret < 0)
603 break;
604
605 ret = sbs_get_battery_property(client, ret, psp, val);
606 break;
607
608 case POWER_SUPPLY_PROP_MODEL_NAME:
609 ret = sbs_get_property_index(client, psp);
610 if (ret < 0)
611 break;
612
613 ret = sbs_get_battery_string_property(client, ret, psp,
614 model_name);
615 val->strval = model_name;
616 break;
617
618 case POWER_SUPPLY_PROP_MANUFACTURER:
619 ret = sbs_get_property_index(client, psp);
620 if (ret < 0)
621 break;
622
623 ret = sbs_get_battery_string_property(client, ret, psp,
624 manufacturer);
625 val->strval = manufacturer;
626 break;
627
628 default:
629 dev_err(&client->dev,
630 "%s: INVALID property\n", __func__);
631 return -EINVAL;
632 }
633
634 if (!chip->enable_detection)
635 goto done;
636
637 if (!chip->gpio_detect &&
638 chip->is_present != (ret >= 0)) {
639 chip->is_present = (ret >= 0);
640 power_supply_changed(chip->power_supply);
641 }
642
643 done:
644 if (!ret) {
645 /* Convert units to match requirements for power supply class */
646 sbs_unit_adjustment(client, psp, val);
647 }
648
649 dev_dbg(&client->dev,
650 "%s: property = %d, value = %x\n", __func__, psp, val->intval);
651
652 if (ret && chip->is_present)
653 return ret;
654
655 /* battery not present, so return NODATA for properties */
656 if (ret)
657 return -ENODATA;
658
659 return 0;
660 }
661
662 static irqreturn_t sbs_irq(int irq, void *devid)
663 {
664 struct power_supply *battery = devid;
665
666 power_supply_changed(battery);
667
668 return IRQ_HANDLED;
669 }
670
671 static void sbs_external_power_changed(struct power_supply *psy)
672 {
673 struct sbs_info *chip = power_supply_get_drvdata(psy);
674
675 if (chip->ignore_changes > 0) {
676 chip->ignore_changes--;
677 return;
678 }
679
680 /* cancel outstanding work */
681 cancel_delayed_work_sync(&chip->work);
682
683 schedule_delayed_work(&chip->work, HZ);
684 chip->poll_time = chip->pdata->poll_retry_count;
685 }
686
687 static void sbs_delayed_work(struct work_struct *work)
688 {
689 struct sbs_info *chip;
690 s32 ret;
691
692 chip = container_of(work, struct sbs_info, work.work);
693
694 ret = sbs_read_word_data(chip->client, sbs_data[REG_STATUS].addr);
695 /* if the read failed, give up on this work */
696 if (ret < 0) {
697 chip->poll_time = 0;
698 return;
699 }
700
701 if (ret & BATTERY_FULL_CHARGED)
702 ret = POWER_SUPPLY_STATUS_FULL;
703 else if (ret & BATTERY_DISCHARGING)
704 ret = POWER_SUPPLY_STATUS_DISCHARGING;
705 else
706 ret = POWER_SUPPLY_STATUS_CHARGING;
707
708 if (chip->last_state != ret) {
709 chip->poll_time = 0;
710 power_supply_changed(chip->power_supply);
711 return;
712 }
713 if (chip->poll_time > 0) {
714 schedule_delayed_work(&chip->work, HZ);
715 chip->poll_time--;
716 return;
717 }
718 }
719
720 #if defined(CONFIG_OF)
721
722 #include <linux/of_device.h>
723 #include <linux/of_gpio.h>
724
725 static const struct of_device_id sbs_dt_ids[] = {
726 { .compatible = "sbs,sbs-battery" },
727 { .compatible = "ti,bq20z75" },
728 { }
729 };
730 MODULE_DEVICE_TABLE(of, sbs_dt_ids);
731
732 static struct sbs_platform_data *sbs_of_populate_pdata(
733 struct i2c_client *client)
734 {
735 struct device_node *of_node = client->dev.of_node;
736 struct sbs_platform_data *pdata = client->dev.platform_data;
737 enum of_gpio_flags gpio_flags;
738 int rc;
739 u32 prop;
740
741 /* verify this driver matches this device */
742 if (!of_node)
743 return NULL;
744
745 /* if platform data is set, honor it */
746 if (pdata)
747 return pdata;
748
749 /* first make sure at least one property is set, otherwise
750 * it won't change behavior from running without pdata.
751 */
752 if (!of_get_property(of_node, "sbs,i2c-retry-count", NULL) &&
753 !of_get_property(of_node, "sbs,poll-retry-count", NULL) &&
754 !of_get_property(of_node, "sbs,battery-detect-gpios", NULL))
755 goto of_out;
756
757 pdata = devm_kzalloc(&client->dev, sizeof(struct sbs_platform_data),
758 GFP_KERNEL);
759 if (!pdata)
760 goto of_out;
761
762 rc = of_property_read_u32(of_node, "sbs,i2c-retry-count", &prop);
763 if (!rc)
764 pdata->i2c_retry_count = prop;
765
766 rc = of_property_read_u32(of_node, "sbs,poll-retry-count", &prop);
767 if (!rc)
768 pdata->poll_retry_count = prop;
769
770 if (!of_get_property(of_node, "sbs,battery-detect-gpios", NULL)) {
771 pdata->battery_detect = -1;
772 goto of_out;
773 }
774
775 pdata->battery_detect = of_get_named_gpio_flags(of_node,
776 "sbs,battery-detect-gpios", 0, &gpio_flags);
777
778 if (gpio_flags & OF_GPIO_ACTIVE_LOW)
779 pdata->battery_detect_present = 0;
780 else
781 pdata->battery_detect_present = 1;
782
783 of_out:
784 return pdata;
785 }
786 #else
787 static struct sbs_platform_data *sbs_of_populate_pdata(
788 struct i2c_client *client)
789 {
790 return client->dev.platform_data;
791 }
792 #endif
793
794 static const struct power_supply_desc sbs_default_desc = {
795 .type = POWER_SUPPLY_TYPE_BATTERY,
796 .properties = sbs_properties,
797 .num_properties = ARRAY_SIZE(sbs_properties),
798 .get_property = sbs_get_property,
799 .external_power_changed = sbs_external_power_changed,
800 };
801
802 static int sbs_probe(struct i2c_client *client,
803 const struct i2c_device_id *id)
804 {
805 struct sbs_info *chip;
806 struct power_supply_desc *sbs_desc;
807 struct sbs_platform_data *pdata = client->dev.platform_data;
808 struct power_supply_config psy_cfg = {};
809 int rc;
810 int irq;
811
812 sbs_desc = devm_kmemdup(&client->dev, &sbs_default_desc,
813 sizeof(*sbs_desc), GFP_KERNEL);
814 if (!sbs_desc)
815 return -ENOMEM;
816
817 sbs_desc->name = devm_kasprintf(&client->dev, GFP_KERNEL, "sbs-%s",
818 dev_name(&client->dev));
819 if (!sbs_desc->name)
820 return -ENOMEM;
821
822 chip = kzalloc(sizeof(struct sbs_info), GFP_KERNEL);
823 if (!chip)
824 return -ENOMEM;
825
826 chip->client = client;
827 chip->enable_detection = false;
828 chip->gpio_detect = false;
829 psy_cfg.of_node = client->dev.of_node;
830 psy_cfg.drv_data = chip;
831 /* ignore first notification of external change, it is generated
832 * from the power_supply_register call back
833 */
834 chip->ignore_changes = 1;
835 chip->last_state = POWER_SUPPLY_STATUS_UNKNOWN;
836
837 pdata = sbs_of_populate_pdata(client);
838
839 if (pdata) {
840 chip->gpio_detect = gpio_is_valid(pdata->battery_detect);
841 chip->pdata = pdata;
842 }
843
844 i2c_set_clientdata(client, chip);
845
846 if (!chip->gpio_detect)
847 goto skip_gpio;
848
849 rc = gpio_request(pdata->battery_detect, dev_name(&client->dev));
850 if (rc) {
851 dev_warn(&client->dev, "Failed to request gpio: %d\n", rc);
852 chip->gpio_detect = false;
853 goto skip_gpio;
854 }
855
856 rc = gpio_direction_input(pdata->battery_detect);
857 if (rc) {
858 dev_warn(&client->dev, "Failed to get gpio as input: %d\n", rc);
859 gpio_free(pdata->battery_detect);
860 chip->gpio_detect = false;
861 goto skip_gpio;
862 }
863
864 irq = gpio_to_irq(pdata->battery_detect);
865 if (irq <= 0) {
866 dev_warn(&client->dev, "Failed to get gpio as irq: %d\n", irq);
867 gpio_free(pdata->battery_detect);
868 chip->gpio_detect = false;
869 goto skip_gpio;
870 }
871
872 rc = request_irq(irq, sbs_irq,
873 IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
874 dev_name(&client->dev), chip->power_supply);
875 if (rc) {
876 dev_warn(&client->dev, "Failed to request irq: %d\n", rc);
877 gpio_free(pdata->battery_detect);
878 chip->gpio_detect = false;
879 goto skip_gpio;
880 }
881
882 chip->irq = irq;
883
884 skip_gpio:
885 /*
886 * Before we register, we might need to make sure we can actually talk
887 * to the battery.
888 */
889 if (!force_load) {
890 rc = sbs_read_word_data(client, sbs_data[REG_STATUS].addr);
891
892 if (rc < 0) {
893 dev_err(&client->dev, "%s: Failed to get device status\n",
894 __func__);
895 goto exit_psupply;
896 }
897 }
898
899 chip->power_supply = power_supply_register(&client->dev, sbs_desc,
900 &psy_cfg);
901 if (IS_ERR(chip->power_supply)) {
902 dev_err(&client->dev,
903 "%s: Failed to register power supply\n", __func__);
904 rc = PTR_ERR(chip->power_supply);
905 goto exit_psupply;
906 }
907
908 dev_info(&client->dev,
909 "%s: battery gas gauge device registered\n", client->name);
910
911 INIT_DELAYED_WORK(&chip->work, sbs_delayed_work);
912
913 chip->enable_detection = true;
914
915 return 0;
916
917 exit_psupply:
918 if (chip->irq)
919 free_irq(chip->irq, chip->power_supply);
920 if (chip->gpio_detect)
921 gpio_free(pdata->battery_detect);
922
923 kfree(chip);
924
925 return rc;
926 }
927
928 static int sbs_remove(struct i2c_client *client)
929 {
930 struct sbs_info *chip = i2c_get_clientdata(client);
931
932 if (chip->irq)
933 free_irq(chip->irq, chip->power_supply);
934 if (chip->gpio_detect)
935 gpio_free(chip->pdata->battery_detect);
936
937 power_supply_unregister(chip->power_supply);
938
939 cancel_delayed_work_sync(&chip->work);
940
941 kfree(chip);
942 chip = NULL;
943
944 return 0;
945 }
946
947 #if defined CONFIG_PM_SLEEP
948
949 static int sbs_suspend(struct device *dev)
950 {
951 struct i2c_client *client = to_i2c_client(dev);
952 struct sbs_info *chip = i2c_get_clientdata(client);
953 s32 ret;
954
955 if (chip->poll_time > 0)
956 cancel_delayed_work_sync(&chip->work);
957
958 /* write to manufacturer access with sleep command */
959 ret = sbs_write_word_data(client, sbs_data[REG_MANUFACTURER_DATA].addr,
960 MANUFACTURER_ACCESS_SLEEP);
961 if (chip->is_present && ret < 0)
962 return ret;
963
964 return 0;
965 }
966
967 static SIMPLE_DEV_PM_OPS(sbs_pm_ops, sbs_suspend, NULL);
968 #define SBS_PM_OPS (&sbs_pm_ops)
969
970 #else
971 #define SBS_PM_OPS NULL
972 #endif
973
974 static const struct i2c_device_id sbs_id[] = {
975 { "bq20z75", 0 },
976 { "sbs-battery", 1 },
977 {}
978 };
979 MODULE_DEVICE_TABLE(i2c, sbs_id);
980
981 static struct i2c_driver sbs_battery_driver = {
982 .probe = sbs_probe,
983 .remove = sbs_remove,
984 .id_table = sbs_id,
985 .driver = {
986 .name = "sbs-battery",
987 .of_match_table = of_match_ptr(sbs_dt_ids),
988 .pm = SBS_PM_OPS,
989 },
990 };
991 module_i2c_driver(sbs_battery_driver);
992
993 MODULE_DESCRIPTION("SBS battery monitor driver");
994 MODULE_LICENSE("GPL");
995
996 module_param(force_load, bool, S_IRUSR | S_IRGRP | S_IROTH);
997 MODULE_PARM_DESC(force_load,
998 "Attempt to load the driver even if no battery is connected");
Linux kernel - Deliverables
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