Version:  2.0.40 2.2.26 2.4.37 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7

Linux/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");
999 

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