power: supply: fix spelling mistake "Gauage" -> "Gauge"
[muen/linux.git] / drivers / power / supply / ds2780_battery.c
1 /*
2  * 1-wire client/driver for the Maxim/Dallas DS2780 Stand-Alone Fuel Gauge IC
3  *
4  * Copyright (C) 2010 Indesign, LLC
5  *
6  * Author: Clifton Barnes <cabarnes@indesign-llc.com>
7  *
8  * Based on ds2760_battery and ds2782_battery drivers
9  *
10  * This program is free software; you can redistribute it and/or modify
11  * it under the terms of the GNU General Public License version 2 as
12  * published by the Free Software Foundation.
13  *
14  */
15
16 #include <linux/module.h>
17 #include <linux/slab.h>
18 #include <linux/param.h>
19 #include <linux/pm.h>
20 #include <linux/platform_device.h>
21 #include <linux/power_supply.h>
22 #include <linux/idr.h>
23
24 #include <linux/w1.h>
25 #include "../../w1/slaves/w1_ds2780.h"
26
27 /* Current unit measurement in uA for a 1 milli-ohm sense resistor */
28 #define DS2780_CURRENT_UNITS    1563
29 /* Charge unit measurement in uAh for a 1 milli-ohm sense resistor */
30 #define DS2780_CHARGE_UNITS             6250
31 /* Number of bytes in user EEPROM space */
32 #define DS2780_USER_EEPROM_SIZE         (DS2780_EEPROM_BLOCK0_END - \
33                                         DS2780_EEPROM_BLOCK0_START + 1)
34 /* Number of bytes in parameter EEPROM space */
35 #define DS2780_PARAM_EEPROM_SIZE        (DS2780_EEPROM_BLOCK1_END - \
36                                         DS2780_EEPROM_BLOCK1_START + 1)
37
38 struct ds2780_device_info {
39         struct device *dev;
40         struct power_supply *bat;
41         struct power_supply_desc bat_desc;
42         struct device *w1_dev;
43 };
44
45 enum current_types {
46         CURRENT_NOW,
47         CURRENT_AVG,
48 };
49
50 static const char model[] = "DS2780";
51 static const char manufacturer[] = "Maxim/Dallas";
52
53 static inline struct ds2780_device_info *
54 to_ds2780_device_info(struct power_supply *psy)
55 {
56         return power_supply_get_drvdata(psy);
57 }
58
59 static inline int ds2780_battery_io(struct ds2780_device_info *dev_info,
60         char *buf, int addr, size_t count, int io)
61 {
62         return w1_ds2780_io(dev_info->w1_dev, buf, addr, count, io);
63 }
64
65 static inline int ds2780_read8(struct ds2780_device_info *dev_info, u8 *val,
66         int addr)
67 {
68         return ds2780_battery_io(dev_info, val, addr, sizeof(u8), 0);
69 }
70
71 static int ds2780_read16(struct ds2780_device_info *dev_info, s16 *val,
72         int addr)
73 {
74         int ret;
75         u8 raw[2];
76
77         ret = ds2780_battery_io(dev_info, raw, addr, sizeof(raw), 0);
78         if (ret < 0)
79                 return ret;
80
81         *val = (raw[0] << 8) | raw[1];
82
83         return 0;
84 }
85
86 static inline int ds2780_read_block(struct ds2780_device_info *dev_info,
87         u8 *val, int addr, size_t count)
88 {
89         return ds2780_battery_io(dev_info, val, addr, count, 0);
90 }
91
92 static inline int ds2780_write(struct ds2780_device_info *dev_info, u8 *val,
93         int addr, size_t count)
94 {
95         return ds2780_battery_io(dev_info, val, addr, count, 1);
96 }
97
98 static inline int ds2780_store_eeprom(struct device *dev, int addr)
99 {
100         return w1_ds2780_eeprom_cmd(dev, addr, W1_DS2780_COPY_DATA);
101 }
102
103 static inline int ds2780_recall_eeprom(struct device *dev, int addr)
104 {
105         return w1_ds2780_eeprom_cmd(dev, addr, W1_DS2780_RECALL_DATA);
106 }
107
108 static int ds2780_save_eeprom(struct ds2780_device_info *dev_info, int reg)
109 {
110         int ret;
111
112         ret = ds2780_store_eeprom(dev_info->w1_dev, reg);
113         if (ret < 0)
114                 return ret;
115
116         ret = ds2780_recall_eeprom(dev_info->w1_dev, reg);
117         if (ret < 0)
118                 return ret;
119
120         return 0;
121 }
122
123 /* Set sense resistor value in mhos */
124 static int ds2780_set_sense_register(struct ds2780_device_info *dev_info,
125         u8 conductance)
126 {
127         int ret;
128
129         ret = ds2780_write(dev_info, &conductance,
130                                 DS2780_RSNSP_REG, sizeof(u8));
131         if (ret < 0)
132                 return ret;
133
134         return ds2780_save_eeprom(dev_info, DS2780_RSNSP_REG);
135 }
136
137 /* Get RSGAIN value from 0 to 1.999 in steps of 0.001 */
138 static int ds2780_get_rsgain_register(struct ds2780_device_info *dev_info,
139         u16 *rsgain)
140 {
141         return ds2780_read16(dev_info, rsgain, DS2780_RSGAIN_MSB_REG);
142 }
143
144 /* Set RSGAIN value from 0 to 1.999 in steps of 0.001 */
145 static int ds2780_set_rsgain_register(struct ds2780_device_info *dev_info,
146         u16 rsgain)
147 {
148         int ret;
149         u8 raw[] = {rsgain >> 8, rsgain & 0xFF};
150
151         ret = ds2780_write(dev_info, raw,
152                                 DS2780_RSGAIN_MSB_REG, sizeof(raw));
153         if (ret < 0)
154                 return ret;
155
156         return ds2780_save_eeprom(dev_info, DS2780_RSGAIN_MSB_REG);
157 }
158
159 static int ds2780_get_voltage(struct ds2780_device_info *dev_info,
160         int *voltage_uV)
161 {
162         int ret;
163         s16 voltage_raw;
164
165         /*
166          * The voltage value is located in 10 bits across the voltage MSB
167          * and LSB registers in two's compliment form
168          * Sign bit of the voltage value is in bit 7 of the voltage MSB register
169          * Bits 9 - 3 of the voltage value are in bits 6 - 0 of the
170          * voltage MSB register
171          * Bits 2 - 0 of the voltage value are in bits 7 - 5 of the
172          * voltage LSB register
173          */
174         ret = ds2780_read16(dev_info, &voltage_raw,
175                                 DS2780_VOLT_MSB_REG);
176         if (ret < 0)
177                 return ret;
178
179         /*
180          * DS2780 reports voltage in units of 4.88mV, but the battery class
181          * reports in units of uV, so convert by multiplying by 4880.
182          */
183         *voltage_uV = (voltage_raw / 32) * 4880;
184         return 0;
185 }
186
187 static int ds2780_get_temperature(struct ds2780_device_info *dev_info,
188         int *temperature)
189 {
190         int ret;
191         s16 temperature_raw;
192
193         /*
194          * The temperature value is located in 10 bits across the temperature
195          * MSB and LSB registers in two's compliment form
196          * Sign bit of the temperature value is in bit 7 of the temperature
197          * MSB register
198          * Bits 9 - 3 of the temperature value are in bits 6 - 0 of the
199          * temperature MSB register
200          * Bits 2 - 0 of the temperature value are in bits 7 - 5 of the
201          * temperature LSB register
202          */
203         ret = ds2780_read16(dev_info, &temperature_raw,
204                                 DS2780_TEMP_MSB_REG);
205         if (ret < 0)
206                 return ret;
207
208         /*
209          * Temperature is measured in units of 0.125 degrees celcius, the
210          * power_supply class measures temperature in tenths of degrees
211          * celsius. The temperature value is stored as a 10 bit number, plus
212          * sign in the upper bits of a 16 bit register.
213          */
214         *temperature = ((temperature_raw / 32) * 125) / 100;
215         return 0;
216 }
217
218 static int ds2780_get_current(struct ds2780_device_info *dev_info,
219         enum current_types type, int *current_uA)
220 {
221         int ret, sense_res;
222         s16 current_raw;
223         u8 sense_res_raw, reg_msb;
224
225         /*
226          * The units of measurement for current are dependent on the value of
227          * the sense resistor.
228          */
229         ret = ds2780_read8(dev_info, &sense_res_raw, DS2780_RSNSP_REG);
230         if (ret < 0)
231                 return ret;
232
233         if (sense_res_raw == 0) {
234                 dev_err(dev_info->dev, "sense resistor value is 0\n");
235                 return -EINVAL;
236         }
237         sense_res = 1000 / sense_res_raw;
238
239         if (type == CURRENT_NOW)
240                 reg_msb = DS2780_CURRENT_MSB_REG;
241         else if (type == CURRENT_AVG)
242                 reg_msb = DS2780_IAVG_MSB_REG;
243         else
244                 return -EINVAL;
245
246         /*
247          * The current value is located in 16 bits across the current MSB
248          * and LSB registers in two's compliment form
249          * Sign bit of the current value is in bit 7 of the current MSB register
250          * Bits 14 - 8 of the current value are in bits 6 - 0 of the current
251          * MSB register
252          * Bits 7 - 0 of the current value are in bits 7 - 0 of the current
253          * LSB register
254          */
255         ret = ds2780_read16(dev_info, &current_raw, reg_msb);
256         if (ret < 0)
257                 return ret;
258
259         *current_uA = current_raw * (DS2780_CURRENT_UNITS / sense_res);
260         return 0;
261 }
262
263 static int ds2780_get_accumulated_current(struct ds2780_device_info *dev_info,
264         int *accumulated_current)
265 {
266         int ret, sense_res;
267         s16 current_raw;
268         u8 sense_res_raw;
269
270         /*
271          * The units of measurement for accumulated current are dependent on
272          * the value of the sense resistor.
273          */
274         ret = ds2780_read8(dev_info, &sense_res_raw, DS2780_RSNSP_REG);
275         if (ret < 0)
276                 return ret;
277
278         if (sense_res_raw == 0) {
279                 dev_err(dev_info->dev, "sense resistor value is 0\n");
280                 return -ENXIO;
281         }
282         sense_res = 1000 / sense_res_raw;
283
284         /*
285          * The ACR value is located in 16 bits across the ACR MSB and
286          * LSB registers
287          * Bits 15 - 8 of the ACR value are in bits 7 - 0 of the ACR
288          * MSB register
289          * Bits 7 - 0 of the ACR value are in bits 7 - 0 of the ACR
290          * LSB register
291          */
292         ret = ds2780_read16(dev_info, &current_raw, DS2780_ACR_MSB_REG);
293         if (ret < 0)
294                 return ret;
295
296         *accumulated_current = current_raw * (DS2780_CHARGE_UNITS / sense_res);
297         return 0;
298 }
299
300 static int ds2780_get_capacity(struct ds2780_device_info *dev_info,
301         int *capacity)
302 {
303         int ret;
304         u8 raw;
305
306         ret = ds2780_read8(dev_info, &raw, DS2780_RARC_REG);
307         if (ret < 0)
308                 return ret;
309
310         *capacity = raw;
311         return raw;
312 }
313
314 static int ds2780_get_status(struct ds2780_device_info *dev_info, int *status)
315 {
316         int ret, current_uA, capacity;
317
318         ret = ds2780_get_current(dev_info, CURRENT_NOW, &current_uA);
319         if (ret < 0)
320                 return ret;
321
322         ret = ds2780_get_capacity(dev_info, &capacity);
323         if (ret < 0)
324                 return ret;
325
326         if (capacity == 100)
327                 *status = POWER_SUPPLY_STATUS_FULL;
328         else if (current_uA == 0)
329                 *status = POWER_SUPPLY_STATUS_NOT_CHARGING;
330         else if (current_uA < 0)
331                 *status = POWER_SUPPLY_STATUS_DISCHARGING;
332         else
333                 *status = POWER_SUPPLY_STATUS_CHARGING;
334
335         return 0;
336 }
337
338 static int ds2780_get_charge_now(struct ds2780_device_info *dev_info,
339         int *charge_now)
340 {
341         int ret;
342         u16 charge_raw;
343
344         /*
345          * The RAAC value is located in 16 bits across the RAAC MSB and
346          * LSB registers
347          * Bits 15 - 8 of the RAAC value are in bits 7 - 0 of the RAAC
348          * MSB register
349          * Bits 7 - 0 of the RAAC value are in bits 7 - 0 of the RAAC
350          * LSB register
351          */
352         ret = ds2780_read16(dev_info, &charge_raw, DS2780_RAAC_MSB_REG);
353         if (ret < 0)
354                 return ret;
355
356         *charge_now = charge_raw * 1600;
357         return 0;
358 }
359
360 static int ds2780_get_control_register(struct ds2780_device_info *dev_info,
361         u8 *control_reg)
362 {
363         return ds2780_read8(dev_info, control_reg, DS2780_CONTROL_REG);
364 }
365
366 static int ds2780_set_control_register(struct ds2780_device_info *dev_info,
367         u8 control_reg)
368 {
369         int ret;
370
371         ret = ds2780_write(dev_info, &control_reg,
372                                 DS2780_CONTROL_REG, sizeof(u8));
373         if (ret < 0)
374                 return ret;
375
376         return ds2780_save_eeprom(dev_info, DS2780_CONTROL_REG);
377 }
378
379 static int ds2780_battery_get_property(struct power_supply *psy,
380         enum power_supply_property psp,
381         union power_supply_propval *val)
382 {
383         int ret = 0;
384         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
385
386         switch (psp) {
387         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
388                 ret = ds2780_get_voltage(dev_info, &val->intval);
389                 break;
390
391         case POWER_SUPPLY_PROP_TEMP:
392                 ret = ds2780_get_temperature(dev_info, &val->intval);
393                 break;
394
395         case POWER_SUPPLY_PROP_MODEL_NAME:
396                 val->strval = model;
397                 break;
398
399         case POWER_SUPPLY_PROP_MANUFACTURER:
400                 val->strval = manufacturer;
401                 break;
402
403         case POWER_SUPPLY_PROP_CURRENT_NOW:
404                 ret = ds2780_get_current(dev_info, CURRENT_NOW, &val->intval);
405                 break;
406
407         case POWER_SUPPLY_PROP_CURRENT_AVG:
408                 ret = ds2780_get_current(dev_info, CURRENT_AVG, &val->intval);
409                 break;
410
411         case POWER_SUPPLY_PROP_STATUS:
412                 ret = ds2780_get_status(dev_info, &val->intval);
413                 break;
414
415         case POWER_SUPPLY_PROP_CAPACITY:
416                 ret = ds2780_get_capacity(dev_info, &val->intval);
417                 break;
418
419         case POWER_SUPPLY_PROP_CHARGE_COUNTER:
420                 ret = ds2780_get_accumulated_current(dev_info, &val->intval);
421                 break;
422
423         case POWER_SUPPLY_PROP_CHARGE_NOW:
424                 ret = ds2780_get_charge_now(dev_info, &val->intval);
425                 break;
426
427         default:
428                 ret = -EINVAL;
429         }
430
431         return ret;
432 }
433
434 static enum power_supply_property ds2780_battery_props[] = {
435         POWER_SUPPLY_PROP_STATUS,
436         POWER_SUPPLY_PROP_VOLTAGE_NOW,
437         POWER_SUPPLY_PROP_TEMP,
438         POWER_SUPPLY_PROP_MODEL_NAME,
439         POWER_SUPPLY_PROP_MANUFACTURER,
440         POWER_SUPPLY_PROP_CURRENT_NOW,
441         POWER_SUPPLY_PROP_CURRENT_AVG,
442         POWER_SUPPLY_PROP_CAPACITY,
443         POWER_SUPPLY_PROP_CHARGE_COUNTER,
444         POWER_SUPPLY_PROP_CHARGE_NOW,
445 };
446
447 static ssize_t ds2780_get_pmod_enabled(struct device *dev,
448         struct device_attribute *attr,
449         char *buf)
450 {
451         int ret;
452         u8 control_reg;
453         struct power_supply *psy = to_power_supply(dev);
454         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
455
456         /* Get power mode */
457         ret = ds2780_get_control_register(dev_info, &control_reg);
458         if (ret < 0)
459                 return ret;
460
461         return sprintf(buf, "%d\n",
462                  !!(control_reg & DS2780_CONTROL_REG_PMOD));
463 }
464
465 static ssize_t ds2780_set_pmod_enabled(struct device *dev,
466         struct device_attribute *attr,
467         const char *buf,
468         size_t count)
469 {
470         int ret;
471         u8 control_reg, new_setting;
472         struct power_supply *psy = to_power_supply(dev);
473         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
474
475         /* Set power mode */
476         ret = ds2780_get_control_register(dev_info, &control_reg);
477         if (ret < 0)
478                 return ret;
479
480         ret = kstrtou8(buf, 0, &new_setting);
481         if (ret < 0)
482                 return ret;
483
484         if ((new_setting != 0) && (new_setting != 1)) {
485                 dev_err(dev_info->dev, "Invalid pmod setting (0 or 1)\n");
486                 return -EINVAL;
487         }
488
489         if (new_setting)
490                 control_reg |= DS2780_CONTROL_REG_PMOD;
491         else
492                 control_reg &= ~DS2780_CONTROL_REG_PMOD;
493
494         ret = ds2780_set_control_register(dev_info, control_reg);
495         if (ret < 0)
496                 return ret;
497
498         return count;
499 }
500
501 static ssize_t ds2780_get_sense_resistor_value(struct device *dev,
502         struct device_attribute *attr,
503         char *buf)
504 {
505         int ret;
506         u8 sense_resistor;
507         struct power_supply *psy = to_power_supply(dev);
508         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
509
510         ret = ds2780_read8(dev_info, &sense_resistor, DS2780_RSNSP_REG);
511         if (ret < 0)
512                 return ret;
513
514         ret = sprintf(buf, "%d\n", sense_resistor);
515         return ret;
516 }
517
518 static ssize_t ds2780_set_sense_resistor_value(struct device *dev,
519         struct device_attribute *attr,
520         const char *buf,
521         size_t count)
522 {
523         int ret;
524         u8 new_setting;
525         struct power_supply *psy = to_power_supply(dev);
526         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
527
528         ret = kstrtou8(buf, 0, &new_setting);
529         if (ret < 0)
530                 return ret;
531
532         ret = ds2780_set_sense_register(dev_info, new_setting);
533         if (ret < 0)
534                 return ret;
535
536         return count;
537 }
538
539 static ssize_t ds2780_get_rsgain_setting(struct device *dev,
540         struct device_attribute *attr,
541         char *buf)
542 {
543         int ret;
544         u16 rsgain;
545         struct power_supply *psy = to_power_supply(dev);
546         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
547
548         ret = ds2780_get_rsgain_register(dev_info, &rsgain);
549         if (ret < 0)
550                 return ret;
551
552         return sprintf(buf, "%d\n", rsgain);
553 }
554
555 static ssize_t ds2780_set_rsgain_setting(struct device *dev,
556         struct device_attribute *attr,
557         const char *buf,
558         size_t count)
559 {
560         int ret;
561         u16 new_setting;
562         struct power_supply *psy = to_power_supply(dev);
563         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
564
565         ret = kstrtou16(buf, 0, &new_setting);
566         if (ret < 0)
567                 return ret;
568
569         /* Gain can only be from 0 to 1.999 in steps of .001 */
570         if (new_setting > 1999) {
571                 dev_err(dev_info->dev, "Invalid rsgain setting (0 - 1999)\n");
572                 return -EINVAL;
573         }
574
575         ret = ds2780_set_rsgain_register(dev_info, new_setting);
576         if (ret < 0)
577                 return ret;
578
579         return count;
580 }
581
582 static ssize_t ds2780_get_pio_pin(struct device *dev,
583         struct device_attribute *attr,
584         char *buf)
585 {
586         int ret;
587         u8 sfr;
588         struct power_supply *psy = to_power_supply(dev);
589         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
590
591         ret = ds2780_read8(dev_info, &sfr, DS2780_SFR_REG);
592         if (ret < 0)
593                 return ret;
594
595         ret = sprintf(buf, "%d\n", sfr & DS2780_SFR_REG_PIOSC);
596         return ret;
597 }
598
599 static ssize_t ds2780_set_pio_pin(struct device *dev,
600         struct device_attribute *attr,
601         const char *buf,
602         size_t count)
603 {
604         int ret;
605         u8 new_setting;
606         struct power_supply *psy = to_power_supply(dev);
607         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
608
609         ret = kstrtou8(buf, 0, &new_setting);
610         if (ret < 0)
611                 return ret;
612
613         if ((new_setting != 0) && (new_setting != 1)) {
614                 dev_err(dev_info->dev, "Invalid pio_pin setting (0 or 1)\n");
615                 return -EINVAL;
616         }
617
618         ret = ds2780_write(dev_info, &new_setting,
619                                 DS2780_SFR_REG, sizeof(u8));
620         if (ret < 0)
621                 return ret;
622
623         return count;
624 }
625
626 static ssize_t ds2780_read_param_eeprom_bin(struct file *filp,
627                                 struct kobject *kobj,
628                                 struct bin_attribute *bin_attr,
629                                 char *buf, loff_t off, size_t count)
630 {
631         struct device *dev = container_of(kobj, struct device, kobj);
632         struct power_supply *psy = to_power_supply(dev);
633         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
634
635         return ds2780_read_block(dev_info, buf,
636                                 DS2780_EEPROM_BLOCK1_START + off, count);
637 }
638
639 static ssize_t ds2780_write_param_eeprom_bin(struct file *filp,
640                                 struct kobject *kobj,
641                                 struct bin_attribute *bin_attr,
642                                 char *buf, loff_t off, size_t count)
643 {
644         struct device *dev = container_of(kobj, struct device, kobj);
645         struct power_supply *psy = to_power_supply(dev);
646         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
647         int ret;
648
649         ret = ds2780_write(dev_info, buf,
650                                 DS2780_EEPROM_BLOCK1_START + off, count);
651         if (ret < 0)
652                 return ret;
653
654         ret = ds2780_save_eeprom(dev_info, DS2780_EEPROM_BLOCK1_START);
655         if (ret < 0)
656                 return ret;
657
658         return count;
659 }
660
661 static const struct bin_attribute ds2780_param_eeprom_bin_attr = {
662         .attr = {
663                 .name = "param_eeprom",
664                 .mode = S_IRUGO | S_IWUSR,
665         },
666         .size = DS2780_PARAM_EEPROM_SIZE,
667         .read = ds2780_read_param_eeprom_bin,
668         .write = ds2780_write_param_eeprom_bin,
669 };
670
671 static ssize_t ds2780_read_user_eeprom_bin(struct file *filp,
672                                 struct kobject *kobj,
673                                 struct bin_attribute *bin_attr,
674                                 char *buf, loff_t off, size_t count)
675 {
676         struct device *dev = container_of(kobj, struct device, kobj);
677         struct power_supply *psy = to_power_supply(dev);
678         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
679
680         return ds2780_read_block(dev_info, buf,
681                                 DS2780_EEPROM_BLOCK0_START + off, count);
682 }
683
684 static ssize_t ds2780_write_user_eeprom_bin(struct file *filp,
685                                 struct kobject *kobj,
686                                 struct bin_attribute *bin_attr,
687                                 char *buf, loff_t off, size_t count)
688 {
689         struct device *dev = container_of(kobj, struct device, kobj);
690         struct power_supply *psy = to_power_supply(dev);
691         struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
692         int ret;
693
694         ret = ds2780_write(dev_info, buf,
695                                 DS2780_EEPROM_BLOCK0_START + off, count);
696         if (ret < 0)
697                 return ret;
698
699         ret = ds2780_save_eeprom(dev_info, DS2780_EEPROM_BLOCK0_START);
700         if (ret < 0)
701                 return ret;
702
703         return count;
704 }
705
706 static const struct bin_attribute ds2780_user_eeprom_bin_attr = {
707         .attr = {
708                 .name = "user_eeprom",
709                 .mode = S_IRUGO | S_IWUSR,
710         },
711         .size = DS2780_USER_EEPROM_SIZE,
712         .read = ds2780_read_user_eeprom_bin,
713         .write = ds2780_write_user_eeprom_bin,
714 };
715
716 static DEVICE_ATTR(pmod_enabled, S_IRUGO | S_IWUSR, ds2780_get_pmod_enabled,
717         ds2780_set_pmod_enabled);
718 static DEVICE_ATTR(sense_resistor_value, S_IRUGO | S_IWUSR,
719         ds2780_get_sense_resistor_value, ds2780_set_sense_resistor_value);
720 static DEVICE_ATTR(rsgain_setting, S_IRUGO | S_IWUSR, ds2780_get_rsgain_setting,
721         ds2780_set_rsgain_setting);
722 static DEVICE_ATTR(pio_pin, S_IRUGO | S_IWUSR, ds2780_get_pio_pin,
723         ds2780_set_pio_pin);
724
725
726 static struct attribute *ds2780_attributes[] = {
727         &dev_attr_pmod_enabled.attr,
728         &dev_attr_sense_resistor_value.attr,
729         &dev_attr_rsgain_setting.attr,
730         &dev_attr_pio_pin.attr,
731         NULL
732 };
733
734 static const struct attribute_group ds2780_attr_group = {
735         .attrs = ds2780_attributes,
736 };
737
738 static int ds2780_battery_probe(struct platform_device *pdev)
739 {
740         struct power_supply_config psy_cfg = {};
741         int ret = 0;
742         struct ds2780_device_info *dev_info;
743
744         dev_info = devm_kzalloc(&pdev->dev, sizeof(*dev_info), GFP_KERNEL);
745         if (!dev_info) {
746                 ret = -ENOMEM;
747                 goto fail;
748         }
749
750         platform_set_drvdata(pdev, dev_info);
751
752         dev_info->dev                   = &pdev->dev;
753         dev_info->w1_dev                = pdev->dev.parent;
754         dev_info->bat_desc.name         = dev_name(&pdev->dev);
755         dev_info->bat_desc.type         = POWER_SUPPLY_TYPE_BATTERY;
756         dev_info->bat_desc.properties   = ds2780_battery_props;
757         dev_info->bat_desc.num_properties = ARRAY_SIZE(ds2780_battery_props);
758         dev_info->bat_desc.get_property = ds2780_battery_get_property;
759
760         psy_cfg.drv_data                = dev_info;
761
762         dev_info->bat = power_supply_register(&pdev->dev, &dev_info->bat_desc,
763                                               &psy_cfg);
764         if (IS_ERR(dev_info->bat)) {
765                 dev_err(dev_info->dev, "failed to register battery\n");
766                 ret = PTR_ERR(dev_info->bat);
767                 goto fail;
768         }
769
770         ret = sysfs_create_group(&dev_info->bat->dev.kobj, &ds2780_attr_group);
771         if (ret) {
772                 dev_err(dev_info->dev, "failed to create sysfs group\n");
773                 goto fail_unregister;
774         }
775
776         ret = sysfs_create_bin_file(&dev_info->bat->dev.kobj,
777                                         &ds2780_param_eeprom_bin_attr);
778         if (ret) {
779                 dev_err(dev_info->dev,
780                                 "failed to create param eeprom bin file");
781                 goto fail_remove_group;
782         }
783
784         ret = sysfs_create_bin_file(&dev_info->bat->dev.kobj,
785                                         &ds2780_user_eeprom_bin_attr);
786         if (ret) {
787                 dev_err(dev_info->dev,
788                                 "failed to create user eeprom bin file");
789                 goto fail_remove_bin_file;
790         }
791
792         return 0;
793
794 fail_remove_bin_file:
795         sysfs_remove_bin_file(&dev_info->bat->dev.kobj,
796                                 &ds2780_param_eeprom_bin_attr);
797 fail_remove_group:
798         sysfs_remove_group(&dev_info->bat->dev.kobj, &ds2780_attr_group);
799 fail_unregister:
800         power_supply_unregister(dev_info->bat);
801 fail:
802         return ret;
803 }
804
805 static int ds2780_battery_remove(struct platform_device *pdev)
806 {
807         struct ds2780_device_info *dev_info = platform_get_drvdata(pdev);
808
809         /*
810          * Remove attributes before unregistering power supply
811          * because 'bat' will be freed on power_supply_unregister() call.
812          */
813         sysfs_remove_group(&dev_info->bat->dev.kobj, &ds2780_attr_group);
814
815         power_supply_unregister(dev_info->bat);
816
817         return 0;
818 }
819
820 static struct platform_driver ds2780_battery_driver = {
821         .driver = {
822                 .name = "ds2780-battery",
823         },
824         .probe    = ds2780_battery_probe,
825         .remove   = ds2780_battery_remove,
826 };
827
828 module_platform_driver(ds2780_battery_driver);
829
830 MODULE_LICENSE("GPL");
831 MODULE_AUTHOR("Clifton Barnes <cabarnes@indesign-llc.com>");
832 MODULE_DESCRIPTION("Maxim/Dallas DS2780 Stand-Alone Fuel Gauge IC driver");
833 MODULE_ALIAS("platform:ds2780-battery");