power: supply: fix spelling mistake "Gauage" -> "Gauge"
[muen/linux.git] / drivers / power / supply / ds2781_battery.c
1 /*
2  * 1-wire client/driver for the Maxim/Dallas DS2781 Stand-Alone Fuel Gauge IC
3  *
4  * Author: Renata Sayakhova <renata@oktetlabs.ru>
5  *
6  * Based on ds2780_battery drivers
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License version 2 as
10  * published by the Free Software Foundation.
11  *
12  */
13
14 #include <linux/module.h>
15 #include <linux/slab.h>
16 #include <linux/param.h>
17 #include <linux/pm.h>
18 #include <linux/platform_device.h>
19 #include <linux/power_supply.h>
20 #include <linux/idr.h>
21
22 #include <linux/w1.h>
23 #include "../../w1/slaves/w1_ds2781.h"
24
25 /* Current unit measurement in uA for a 1 milli-ohm sense resistor */
26 #define DS2781_CURRENT_UNITS    1563
27 /* Charge unit measurement in uAh for a 1 milli-ohm sense resistor */
28 #define DS2781_CHARGE_UNITS             6250
29 /* Number of bytes in user EEPROM space */
30 #define DS2781_USER_EEPROM_SIZE         (DS2781_EEPROM_BLOCK0_END - \
31                                         DS2781_EEPROM_BLOCK0_START + 1)
32 /* Number of bytes in parameter EEPROM space */
33 #define DS2781_PARAM_EEPROM_SIZE        (DS2781_EEPROM_BLOCK1_END - \
34                                         DS2781_EEPROM_BLOCK1_START + 1)
35
36 struct ds2781_device_info {
37         struct device *dev;
38         struct power_supply *bat;
39         struct power_supply_desc bat_desc;
40         struct device *w1_dev;
41 };
42
43 enum current_types {
44         CURRENT_NOW,
45         CURRENT_AVG,
46 };
47
48 static const char model[] = "DS2781";
49 static const char manufacturer[] = "Maxim/Dallas";
50
51 static inline struct ds2781_device_info *
52 to_ds2781_device_info(struct power_supply *psy)
53 {
54         return power_supply_get_drvdata(psy);
55 }
56
57 static inline int ds2781_battery_io(struct ds2781_device_info *dev_info,
58         char *buf, int addr, size_t count, int io)
59 {
60         return w1_ds2781_io(dev_info->w1_dev, buf, addr, count, io);
61 }
62
63 static int w1_ds2781_read(struct ds2781_device_info *dev_info, char *buf,
64                 int addr, size_t count)
65 {
66         return ds2781_battery_io(dev_info, buf, addr, count, 0);
67 }
68
69 static inline int ds2781_read8(struct ds2781_device_info *dev_info, u8 *val,
70         int addr)
71 {
72         return ds2781_battery_io(dev_info, val, addr, sizeof(u8), 0);
73 }
74
75 static int ds2781_read16(struct ds2781_device_info *dev_info, s16 *val,
76         int addr)
77 {
78         int ret;
79         u8 raw[2];
80
81         ret = ds2781_battery_io(dev_info, raw, addr, sizeof(raw), 0);
82         if (ret < 0)
83                 return ret;
84
85         *val = (raw[0] << 8) | raw[1];
86
87         return 0;
88 }
89
90 static inline int ds2781_read_block(struct ds2781_device_info *dev_info,
91         u8 *val, int addr, size_t count)
92 {
93         return ds2781_battery_io(dev_info, val, addr, count, 0);
94 }
95
96 static inline int ds2781_write(struct ds2781_device_info *dev_info, u8 *val,
97         int addr, size_t count)
98 {
99         return ds2781_battery_io(dev_info, val, addr, count, 1);
100 }
101
102 static inline int ds2781_store_eeprom(struct device *dev, int addr)
103 {
104         return w1_ds2781_eeprom_cmd(dev, addr, W1_DS2781_COPY_DATA);
105 }
106
107 static inline int ds2781_recall_eeprom(struct device *dev, int addr)
108 {
109         return w1_ds2781_eeprom_cmd(dev, addr, W1_DS2781_RECALL_DATA);
110 }
111
112 static int ds2781_save_eeprom(struct ds2781_device_info *dev_info, int reg)
113 {
114         int ret;
115
116         ret = ds2781_store_eeprom(dev_info->w1_dev, reg);
117         if (ret < 0)
118                 return ret;
119
120         ret = ds2781_recall_eeprom(dev_info->w1_dev, reg);
121         if (ret < 0)
122                 return ret;
123
124         return 0;
125 }
126
127 /* Set sense resistor value in mhos */
128 static int ds2781_set_sense_register(struct ds2781_device_info *dev_info,
129         u8 conductance)
130 {
131         int ret;
132
133         ret = ds2781_write(dev_info, &conductance,
134                                 DS2781_RSNSP, sizeof(u8));
135         if (ret < 0)
136                 return ret;
137
138         return ds2781_save_eeprom(dev_info, DS2781_RSNSP);
139 }
140
141 /* Get RSGAIN value from 0 to 1.999 in steps of 0.001 */
142 static int ds2781_get_rsgain_register(struct ds2781_device_info *dev_info,
143         u16 *rsgain)
144 {
145         return ds2781_read16(dev_info, rsgain, DS2781_RSGAIN_MSB);
146 }
147
148 /* Set RSGAIN value from 0 to 1.999 in steps of 0.001 */
149 static int ds2781_set_rsgain_register(struct ds2781_device_info *dev_info,
150         u16 rsgain)
151 {
152         int ret;
153         u8 raw[] = {rsgain >> 8, rsgain & 0xFF};
154
155         ret = ds2781_write(dev_info, raw,
156                                 DS2781_RSGAIN_MSB, sizeof(raw));
157         if (ret < 0)
158                 return ret;
159
160         return ds2781_save_eeprom(dev_info, DS2781_RSGAIN_MSB);
161 }
162
163 static int ds2781_get_voltage(struct ds2781_device_info *dev_info,
164         int *voltage_uV)
165 {
166         int ret;
167         char val[2];
168         int voltage_raw;
169
170         ret = w1_ds2781_read(dev_info, val, DS2781_VOLT_MSB, 2 * sizeof(u8));
171         if (ret < 0)
172                 return ret;
173         /*
174          * The voltage value is located in 10 bits across the voltage MSB
175          * and LSB registers in two's compliment form
176          * Sign bit of the voltage value is in bit 7 of the voltage MSB register
177          * Bits 9 - 3 of the voltage value are in bits 6 - 0 of the
178          * voltage MSB register
179          * Bits 2 - 0 of the voltage value are in bits 7 - 5 of the
180          * voltage LSB register
181          */
182         voltage_raw = (val[0] << 3) |
183                 (val[1] >> 5);
184
185         /* DS2781 reports voltage in units of 9.76mV, but the battery class
186          * reports in units of uV, so convert by multiplying by 9760. */
187         *voltage_uV = voltage_raw * 9760;
188
189         return 0;
190 }
191
192 static int ds2781_get_temperature(struct ds2781_device_info *dev_info,
193         int *temp)
194 {
195         int ret;
196         char val[2];
197         int temp_raw;
198
199         ret = w1_ds2781_read(dev_info, val, DS2781_TEMP_MSB, 2 * sizeof(u8));
200         if (ret < 0)
201                 return ret;
202         /*
203          * The temperature value is located in 10 bits across the temperature
204          * MSB and LSB registers in two's compliment form
205          * Sign bit of the temperature value is in bit 7 of the temperature
206          * MSB register
207          * Bits 9 - 3 of the temperature value are in bits 6 - 0 of the
208          * temperature MSB register
209          * Bits 2 - 0 of the temperature value are in bits 7 - 5 of the
210          * temperature LSB register
211          */
212         temp_raw = ((val[0]) << 3) |
213                 (val[1] >> 5);
214         *temp = temp_raw + (temp_raw / 4);
215
216         return 0;
217 }
218
219 static int ds2781_get_current(struct ds2781_device_info *dev_info,
220         enum current_types type, int *current_uA)
221 {
222         int ret, sense_res;
223         s16 current_raw;
224         u8 sense_res_raw, reg_msb;
225
226         /*
227          * The units of measurement for current are dependent on the value of
228          * the sense resistor.
229          */
230         ret = ds2781_read8(dev_info, &sense_res_raw, DS2781_RSNSP);
231         if (ret < 0)
232                 return ret;
233
234         if (sense_res_raw == 0) {
235                 dev_err(dev_info->dev, "sense resistor value is 0\n");
236                 return -EINVAL;
237         }
238         sense_res = 1000 / sense_res_raw;
239
240         if (type == CURRENT_NOW)
241                 reg_msb = DS2781_CURRENT_MSB;
242         else if (type == CURRENT_AVG)
243                 reg_msb = DS2781_IAVG_MSB;
244         else
245                 return -EINVAL;
246
247         /*
248          * The current value is located in 16 bits across the current MSB
249          * and LSB registers in two's compliment form
250          * Sign bit of the current value is in bit 7 of the current MSB register
251          * Bits 14 - 8 of the current value are in bits 6 - 0 of the current
252          * MSB register
253          * Bits 7 - 0 of the current value are in bits 7 - 0 of the current
254          * LSB register
255          */
256         ret = ds2781_read16(dev_info, &current_raw, reg_msb);
257         if (ret < 0)
258                 return ret;
259
260         *current_uA = current_raw * (DS2781_CURRENT_UNITS / sense_res);
261         return 0;
262 }
263
264 static int ds2781_get_accumulated_current(struct ds2781_device_info *dev_info,
265         int *accumulated_current)
266 {
267         int ret, sense_res;
268         s16 current_raw;
269         u8 sense_res_raw;
270
271         /*
272          * The units of measurement for accumulated current are dependent on
273          * the value of the sense resistor.
274          */
275         ret = ds2781_read8(dev_info, &sense_res_raw, DS2781_RSNSP);
276         if (ret < 0)
277                 return ret;
278
279         if (sense_res_raw == 0) {
280                 dev_err(dev_info->dev, "sense resistor value is 0\n");
281                 return -EINVAL;
282         }
283         sense_res = 1000 / sense_res_raw;
284
285         /*
286          * The ACR value is located in 16 bits across the ACR MSB and
287          * LSB registers
288          * Bits 15 - 8 of the ACR value are in bits 7 - 0 of the ACR
289          * MSB register
290          * Bits 7 - 0 of the ACR value are in bits 7 - 0 of the ACR
291          * LSB register
292          */
293         ret = ds2781_read16(dev_info, &current_raw, DS2781_ACR_MSB);
294         if (ret < 0)
295                 return ret;
296
297         *accumulated_current = current_raw * (DS2781_CHARGE_UNITS / sense_res);
298         return 0;
299 }
300
301 static int ds2781_get_capacity(struct ds2781_device_info *dev_info,
302         int *capacity)
303 {
304         int ret;
305         u8 raw;
306
307         ret = ds2781_read8(dev_info, &raw, DS2781_RARC);
308         if (ret < 0)
309                 return ret;
310
311         *capacity = raw;
312         return 0;
313 }
314
315 static int ds2781_get_status(struct ds2781_device_info *dev_info, int *status)
316 {
317         int ret, current_uA, capacity;
318
319         ret = ds2781_get_current(dev_info, CURRENT_NOW, &current_uA);
320         if (ret < 0)
321                 return ret;
322
323         ret = ds2781_get_capacity(dev_info, &capacity);
324         if (ret < 0)
325                 return ret;
326
327         if (power_supply_am_i_supplied(dev_info->bat)) {
328                 if (capacity == 100)
329                         *status = POWER_SUPPLY_STATUS_FULL;
330                 else if (current_uA > 50000)
331                         *status = POWER_SUPPLY_STATUS_CHARGING;
332                 else
333                         *status = POWER_SUPPLY_STATUS_NOT_CHARGING;
334         } else {
335                 *status = POWER_SUPPLY_STATUS_DISCHARGING;
336         }
337         return 0;
338 }
339
340 static int ds2781_get_charge_now(struct ds2781_device_info *dev_info,
341         int *charge_now)
342 {
343         int ret;
344         u16 charge_raw;
345
346         /*
347          * The RAAC value is located in 16 bits across the RAAC MSB and
348          * LSB registers
349          * Bits 15 - 8 of the RAAC value are in bits 7 - 0 of the RAAC
350          * MSB register
351          * Bits 7 - 0 of the RAAC value are in bits 7 - 0 of the RAAC
352          * LSB register
353          */
354         ret = ds2781_read16(dev_info, &charge_raw, DS2781_RAAC_MSB);
355         if (ret < 0)
356                 return ret;
357
358         *charge_now = charge_raw * 1600;
359         return 0;
360 }
361
362 static int ds2781_get_control_register(struct ds2781_device_info *dev_info,
363         u8 *control_reg)
364 {
365         return ds2781_read8(dev_info, control_reg, DS2781_CONTROL);
366 }
367
368 static int ds2781_set_control_register(struct ds2781_device_info *dev_info,
369         u8 control_reg)
370 {
371         int ret;
372
373         ret = ds2781_write(dev_info, &control_reg,
374                                 DS2781_CONTROL, sizeof(u8));
375         if (ret < 0)
376                 return ret;
377
378         return ds2781_save_eeprom(dev_info, DS2781_CONTROL);
379 }
380
381 static int ds2781_battery_get_property(struct power_supply *psy,
382         enum power_supply_property psp,
383         union power_supply_propval *val)
384 {
385         int ret = 0;
386         struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
387
388         switch (psp) {
389         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
390                 ret = ds2781_get_voltage(dev_info, &val->intval);
391                 break;
392
393         case POWER_SUPPLY_PROP_TEMP:
394                 ret = ds2781_get_temperature(dev_info, &val->intval);
395                 break;
396
397         case POWER_SUPPLY_PROP_MODEL_NAME:
398                 val->strval = model;
399                 break;
400
401         case POWER_SUPPLY_PROP_MANUFACTURER:
402                 val->strval = manufacturer;
403                 break;
404
405         case POWER_SUPPLY_PROP_CURRENT_NOW:
406                 ret = ds2781_get_current(dev_info, CURRENT_NOW, &val->intval);
407                 break;
408
409         case POWER_SUPPLY_PROP_CURRENT_AVG:
410                 ret = ds2781_get_current(dev_info, CURRENT_AVG, &val->intval);
411                 break;
412
413         case POWER_SUPPLY_PROP_STATUS:
414                 ret = ds2781_get_status(dev_info, &val->intval);
415                 break;
416
417         case POWER_SUPPLY_PROP_CAPACITY:
418                 ret = ds2781_get_capacity(dev_info, &val->intval);
419                 break;
420
421         case POWER_SUPPLY_PROP_CHARGE_COUNTER:
422                 ret = ds2781_get_accumulated_current(dev_info, &val->intval);
423                 break;
424
425         case POWER_SUPPLY_PROP_CHARGE_NOW:
426                 ret = ds2781_get_charge_now(dev_info, &val->intval);
427                 break;
428
429         default:
430                 ret = -EINVAL;
431         }
432
433         return ret;
434 }
435
436 static enum power_supply_property ds2781_battery_props[] = {
437         POWER_SUPPLY_PROP_STATUS,
438         POWER_SUPPLY_PROP_VOLTAGE_NOW,
439         POWER_SUPPLY_PROP_TEMP,
440         POWER_SUPPLY_PROP_MODEL_NAME,
441         POWER_SUPPLY_PROP_MANUFACTURER,
442         POWER_SUPPLY_PROP_CURRENT_NOW,
443         POWER_SUPPLY_PROP_CURRENT_AVG,
444         POWER_SUPPLY_PROP_CAPACITY,
445         POWER_SUPPLY_PROP_CHARGE_COUNTER,
446         POWER_SUPPLY_PROP_CHARGE_NOW,
447 };
448
449 static ssize_t ds2781_get_pmod_enabled(struct device *dev,
450         struct device_attribute *attr,
451         char *buf)
452 {
453         int ret;
454         u8 control_reg;
455         struct power_supply *psy = to_power_supply(dev);
456         struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
457
458         /* Get power mode */
459         ret = ds2781_get_control_register(dev_info, &control_reg);
460         if (ret < 0)
461                 return ret;
462
463         return sprintf(buf, "%d\n",
464                  !!(control_reg & DS2781_CONTROL_PMOD));
465 }
466
467 static ssize_t ds2781_set_pmod_enabled(struct device *dev,
468         struct device_attribute *attr,
469         const char *buf,
470         size_t count)
471 {
472         int ret;
473         u8 control_reg, new_setting;
474         struct power_supply *psy = to_power_supply(dev);
475         struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
476
477         /* Set power mode */
478         ret = ds2781_get_control_register(dev_info, &control_reg);
479         if (ret < 0)
480                 return ret;
481
482         ret = kstrtou8(buf, 0, &new_setting);
483         if (ret < 0)
484                 return ret;
485
486         if ((new_setting != 0) && (new_setting != 1)) {
487                 dev_err(dev_info->dev, "Invalid pmod setting (0 or 1)\n");
488                 return -EINVAL;
489         }
490
491         if (new_setting)
492                 control_reg |= DS2781_CONTROL_PMOD;
493         else
494                 control_reg &= ~DS2781_CONTROL_PMOD;
495
496         ret = ds2781_set_control_register(dev_info, control_reg);
497         if (ret < 0)
498                 return ret;
499
500         return count;
501 }
502
503 static ssize_t ds2781_get_sense_resistor_value(struct device *dev,
504         struct device_attribute *attr,
505         char *buf)
506 {
507         int ret;
508         u8 sense_resistor;
509         struct power_supply *psy = to_power_supply(dev);
510         struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
511
512         ret = ds2781_read8(dev_info, &sense_resistor, DS2781_RSNSP);
513         if (ret < 0)
514                 return ret;
515
516         ret = sprintf(buf, "%d\n", sense_resistor);
517         return ret;
518 }
519
520 static ssize_t ds2781_set_sense_resistor_value(struct device *dev,
521         struct device_attribute *attr,
522         const char *buf,
523         size_t count)
524 {
525         int ret;
526         u8 new_setting;
527         struct power_supply *psy = to_power_supply(dev);
528         struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
529
530         ret = kstrtou8(buf, 0, &new_setting);
531         if (ret < 0)
532                 return ret;
533
534         ret = ds2781_set_sense_register(dev_info, new_setting);
535         if (ret < 0)
536                 return ret;
537
538         return count;
539 }
540
541 static ssize_t ds2781_get_rsgain_setting(struct device *dev,
542         struct device_attribute *attr,
543         char *buf)
544 {
545         int ret;
546         u16 rsgain;
547         struct power_supply *psy = to_power_supply(dev);
548         struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
549
550         ret = ds2781_get_rsgain_register(dev_info, &rsgain);
551         if (ret < 0)
552                 return ret;
553
554         return sprintf(buf, "%d\n", rsgain);
555 }
556
557 static ssize_t ds2781_set_rsgain_setting(struct device *dev,
558         struct device_attribute *attr,
559         const char *buf,
560         size_t count)
561 {
562         int ret;
563         u16 new_setting;
564         struct power_supply *psy = to_power_supply(dev);
565         struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
566
567         ret = kstrtou16(buf, 0, &new_setting);
568         if (ret < 0)
569                 return ret;
570
571         /* Gain can only be from 0 to 1.999 in steps of .001 */
572         if (new_setting > 1999) {
573                 dev_err(dev_info->dev, "Invalid rsgain setting (0 - 1999)\n");
574                 return -EINVAL;
575         }
576
577         ret = ds2781_set_rsgain_register(dev_info, new_setting);
578         if (ret < 0)
579                 return ret;
580
581         return count;
582 }
583
584 static ssize_t ds2781_get_pio_pin(struct device *dev,
585         struct device_attribute *attr,
586         char *buf)
587 {
588         int ret;
589         u8 sfr;
590         struct power_supply *psy = to_power_supply(dev);
591         struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
592
593         ret = ds2781_read8(dev_info, &sfr, DS2781_SFR);
594         if (ret < 0)
595                 return ret;
596
597         ret = sprintf(buf, "%d\n", sfr & DS2781_SFR_PIOSC);
598         return ret;
599 }
600
601 static ssize_t ds2781_set_pio_pin(struct device *dev,
602         struct device_attribute *attr,
603         const char *buf,
604         size_t count)
605 {
606         int ret;
607         u8 new_setting;
608         struct power_supply *psy = to_power_supply(dev);
609         struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
610
611         ret = kstrtou8(buf, 0, &new_setting);
612         if (ret < 0)
613                 return ret;
614
615         if ((new_setting != 0) && (new_setting != 1)) {
616                 dev_err(dev_info->dev, "Invalid pio_pin setting (0 or 1)\n");
617                 return -EINVAL;
618         }
619
620         ret = ds2781_write(dev_info, &new_setting,
621                                 DS2781_SFR, sizeof(u8));
622         if (ret < 0)
623                 return ret;
624
625         return count;
626 }
627
628 static ssize_t ds2781_read_param_eeprom_bin(struct file *filp,
629                                 struct kobject *kobj,
630                                 struct bin_attribute *bin_attr,
631                                 char *buf, loff_t off, size_t count)
632 {
633         struct device *dev = container_of(kobj, struct device, kobj);
634         struct power_supply *psy = to_power_supply(dev);
635         struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
636
637         return ds2781_read_block(dev_info, buf,
638                                 DS2781_EEPROM_BLOCK1_START + off, count);
639 }
640
641 static ssize_t ds2781_write_param_eeprom_bin(struct file *filp,
642                                 struct kobject *kobj,
643                                 struct bin_attribute *bin_attr,
644                                 char *buf, loff_t off, size_t count)
645 {
646         struct device *dev = container_of(kobj, struct device, kobj);
647         struct power_supply *psy = to_power_supply(dev);
648         struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
649         int ret;
650
651         ret = ds2781_write(dev_info, buf,
652                                 DS2781_EEPROM_BLOCK1_START + off, count);
653         if (ret < 0)
654                 return ret;
655
656         ret = ds2781_save_eeprom(dev_info, DS2781_EEPROM_BLOCK1_START);
657         if (ret < 0)
658                 return ret;
659
660         return count;
661 }
662
663 static const struct bin_attribute ds2781_param_eeprom_bin_attr = {
664         .attr = {
665                 .name = "param_eeprom",
666                 .mode = S_IRUGO | S_IWUSR,
667         },
668         .size = DS2781_PARAM_EEPROM_SIZE,
669         .read = ds2781_read_param_eeprom_bin,
670         .write = ds2781_write_param_eeprom_bin,
671 };
672
673 static ssize_t ds2781_read_user_eeprom_bin(struct file *filp,
674                                 struct kobject *kobj,
675                                 struct bin_attribute *bin_attr,
676                                 char *buf, loff_t off, size_t count)
677 {
678         struct device *dev = container_of(kobj, struct device, kobj);
679         struct power_supply *psy = to_power_supply(dev);
680         struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
681
682         return ds2781_read_block(dev_info, buf,
683                                 DS2781_EEPROM_BLOCK0_START + off, count);
684
685 }
686
687 static ssize_t ds2781_write_user_eeprom_bin(struct file *filp,
688                                 struct kobject *kobj,
689                                 struct bin_attribute *bin_attr,
690                                 char *buf, loff_t off, size_t count)
691 {
692         struct device *dev = container_of(kobj, struct device, kobj);
693         struct power_supply *psy = to_power_supply(dev);
694         struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
695         int ret;
696
697         ret = ds2781_write(dev_info, buf,
698                                 DS2781_EEPROM_BLOCK0_START + off, count);
699         if (ret < 0)
700                 return ret;
701
702         ret = ds2781_save_eeprom(dev_info, DS2781_EEPROM_BLOCK0_START);
703         if (ret < 0)
704                 return ret;
705
706         return count;
707 }
708
709 static const struct bin_attribute ds2781_user_eeprom_bin_attr = {
710         .attr = {
711                 .name = "user_eeprom",
712                 .mode = S_IRUGO | S_IWUSR,
713         },
714         .size = DS2781_USER_EEPROM_SIZE,
715         .read = ds2781_read_user_eeprom_bin,
716         .write = ds2781_write_user_eeprom_bin,
717 };
718
719 static DEVICE_ATTR(pmod_enabled, S_IRUGO | S_IWUSR, ds2781_get_pmod_enabled,
720         ds2781_set_pmod_enabled);
721 static DEVICE_ATTR(sense_resistor_value, S_IRUGO | S_IWUSR,
722         ds2781_get_sense_resistor_value, ds2781_set_sense_resistor_value);
723 static DEVICE_ATTR(rsgain_setting, S_IRUGO | S_IWUSR, ds2781_get_rsgain_setting,
724         ds2781_set_rsgain_setting);
725 static DEVICE_ATTR(pio_pin, S_IRUGO | S_IWUSR, ds2781_get_pio_pin,
726         ds2781_set_pio_pin);
727
728
729 static struct attribute *ds2781_attributes[] = {
730         &dev_attr_pmod_enabled.attr,
731         &dev_attr_sense_resistor_value.attr,
732         &dev_attr_rsgain_setting.attr,
733         &dev_attr_pio_pin.attr,
734         NULL
735 };
736
737 static const struct attribute_group ds2781_attr_group = {
738         .attrs = ds2781_attributes,
739 };
740
741 static int ds2781_battery_probe(struct platform_device *pdev)
742 {
743         struct power_supply_config psy_cfg = {};
744         int ret = 0;
745         struct ds2781_device_info *dev_info;
746
747         dev_info = devm_kzalloc(&pdev->dev, sizeof(*dev_info), GFP_KERNEL);
748         if (!dev_info)
749                 return -ENOMEM;
750
751         platform_set_drvdata(pdev, dev_info);
752
753         dev_info->dev                   = &pdev->dev;
754         dev_info->w1_dev                = pdev->dev.parent;
755         dev_info->bat_desc.name         = dev_name(&pdev->dev);
756         dev_info->bat_desc.type         = POWER_SUPPLY_TYPE_BATTERY;
757         dev_info->bat_desc.properties   = ds2781_battery_props;
758         dev_info->bat_desc.num_properties = ARRAY_SIZE(ds2781_battery_props);
759         dev_info->bat_desc.get_property = ds2781_battery_get_property;
760
761         psy_cfg.drv_data                = dev_info;
762
763         dev_info->bat = power_supply_register(&pdev->dev, &dev_info->bat_desc,
764                                                 &psy_cfg);
765         if (IS_ERR(dev_info->bat)) {
766                 dev_err(dev_info->dev, "failed to register battery\n");
767                 ret = PTR_ERR(dev_info->bat);
768                 goto fail;
769         }
770
771         ret = sysfs_create_group(&dev_info->bat->dev.kobj, &ds2781_attr_group);
772         if (ret) {
773                 dev_err(dev_info->dev, "failed to create sysfs group\n");
774                 goto fail_unregister;
775         }
776
777         ret = sysfs_create_bin_file(&dev_info->bat->dev.kobj,
778                                         &ds2781_param_eeprom_bin_attr);
779         if (ret) {
780                 dev_err(dev_info->dev,
781                                 "failed to create param eeprom bin file");
782                 goto fail_remove_group;
783         }
784
785         ret = sysfs_create_bin_file(&dev_info->bat->dev.kobj,
786                                         &ds2781_user_eeprom_bin_attr);
787         if (ret) {
788                 dev_err(dev_info->dev,
789                                 "failed to create user eeprom bin file");
790                 goto fail_remove_bin_file;
791         }
792
793         return 0;
794
795 fail_remove_bin_file:
796         sysfs_remove_bin_file(&dev_info->bat->dev.kobj,
797                                 &ds2781_param_eeprom_bin_attr);
798 fail_remove_group:
799         sysfs_remove_group(&dev_info->bat->dev.kobj, &ds2781_attr_group);
800 fail_unregister:
801         power_supply_unregister(dev_info->bat);
802 fail:
803         return ret;
804 }
805
806 static int ds2781_battery_remove(struct platform_device *pdev)
807 {
808         struct ds2781_device_info *dev_info = platform_get_drvdata(pdev);
809
810         /*
811          * Remove attributes before unregistering power supply
812          * because 'bat' will be freed on power_supply_unregister() call.
813          */
814         sysfs_remove_group(&dev_info->bat->dev.kobj, &ds2781_attr_group);
815
816         power_supply_unregister(dev_info->bat);
817
818         return 0;
819 }
820
821 static struct platform_driver ds2781_battery_driver = {
822         .driver = {
823                 .name = "ds2781-battery",
824         },
825         .probe    = ds2781_battery_probe,
826         .remove   = ds2781_battery_remove,
827 };
828 module_platform_driver(ds2781_battery_driver);
829
830 MODULE_LICENSE("GPL");
831 MODULE_AUTHOR("Renata Sayakhova <renata@oktetlabs.ru>");
832 MODULE_DESCRIPTION("Maxim/Dallas DS2781 Stand-Alone Fuel Gauge IC driver");
833 MODULE_ALIAS("platform:ds2781-battery");
834