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Merge tag 'v3.10.104' into update
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / power / ds2781_battery.c
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fef37e9a
RS		 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 "../w1/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
36struct ds2781_device_info {
37 struct device *dev;
38 struct power_supply bat;
39 struct device *w1_dev;
fef37e9a
RS		 40};
41
42enum current_types {
43 CURRENT_NOW,
44 CURRENT_AVG,
45};
46
47static const char model[] = "DS2781";
48static const char manufacturer[] = "Maxim/Dallas";
49
50static inline struct ds2781_device_info *
51to_ds2781_device_info(struct power_supply *psy)
52{
53 return container_of(psy, struct ds2781_device_info, bat);
54}
55
56static inline struct power_supply *to_power_supply(struct device *dev)
57{
58 return dev_get_drvdata(dev);
59}
60
61static inline int ds2781_battery_io(struct ds2781_device_info *dev_info,
62 char *buf, int addr, size_t count, int io)
63{
b02f8bed 64 return w1_ds2781_io(dev_info->w1_dev, buf, addr, count, io);
fef37e9a
RS		 65}
66
7dbae556 67static int w1_ds2781_read(struct ds2781_device_info *dev_info, char *buf,
fef37e9a
RS		 68 int addr, size_t count)
69{
70 return ds2781_battery_io(dev_info, buf, addr, count, 0);
71}
72
73static inline int ds2781_read8(struct ds2781_device_info *dev_info, u8 *val,
74 int addr)
75{
76 return ds2781_battery_io(dev_info, val, addr, sizeof(u8), 0);
77}
78
79static int ds2781_read16(struct ds2781_device_info *dev_info, s16 *val,
80 int addr)
81{
82 int ret;
83 u8 raw[2];
84
85 ret = ds2781_battery_io(dev_info, raw, addr, sizeof(raw), 0);
86 if (ret < 0)
87 return ret;
88
89 *val = (raw[0] << 8) | raw[1];
90
91 return 0;
92}
93
94static inline int ds2781_read_block(struct ds2781_device_info *dev_info,
95 u8 *val, int addr, size_t count)
96{
97 return ds2781_battery_io(dev_info, val, addr, count, 0);
98}
99
100static inline int ds2781_write(struct ds2781_device_info *dev_info, u8 *val,
101 int addr, size_t count)
102{
103 return ds2781_battery_io(dev_info, val, addr, count, 1);
104}
105
106static inline int ds2781_store_eeprom(struct device *dev, int addr)
107{
108 return w1_ds2781_eeprom_cmd(dev, addr, W1_DS2781_COPY_DATA);
109}
110
111static inline int ds2781_recall_eeprom(struct device *dev, int addr)
112{
113 return w1_ds2781_eeprom_cmd(dev, addr, W1_DS2781_RECALL_DATA);
114}
115
116static int ds2781_save_eeprom(struct ds2781_device_info *dev_info, int reg)
117{
118 int ret;
119
120 ret = ds2781_store_eeprom(dev_info->w1_dev, reg);
121 if (ret < 0)
122 return ret;
123
124 ret = ds2781_recall_eeprom(dev_info->w1_dev, reg);
125 if (ret < 0)
126 return ret;
127
128 return 0;
129}
130
131/* Set sense resistor value in mhos */
132static int ds2781_set_sense_register(struct ds2781_device_info *dev_info,
133 u8 conductance)
134{
135 int ret;
136
137 ret = ds2781_write(dev_info, &conductance,
138 DS2781_RSNSP, sizeof(u8));
139 if (ret < 0)
140 return ret;
141
142 return ds2781_save_eeprom(dev_info, DS2781_RSNSP);
143}
144
145/* Get RSGAIN value from 0 to 1.999 in steps of 0.001 */
146static int ds2781_get_rsgain_register(struct ds2781_device_info *dev_info,
147 u16 *rsgain)
148{
149 return ds2781_read16(dev_info, rsgain, DS2781_RSGAIN_MSB);
150}
151
152/* Set RSGAIN value from 0 to 1.999 in steps of 0.001 */
153static int ds2781_set_rsgain_register(struct ds2781_device_info *dev_info,
154 u16 rsgain)
155{
156 int ret;
157 u8 raw[] = {rsgain >> 8, rsgain & 0xFF};
158
159 ret = ds2781_write(dev_info, raw,
160 DS2781_RSGAIN_MSB, sizeof(raw));
161 if (ret < 0)
162 return ret;
163
164 return ds2781_save_eeprom(dev_info, DS2781_RSGAIN_MSB);
165}
166
167static int ds2781_get_voltage(struct ds2781_device_info *dev_info,
168 int *voltage_uV)
169{
170 int ret;
171 char val[2];
172 int voltage_raw;
173
174 ret = w1_ds2781_read(dev_info, val, DS2781_VOLT_MSB, 2 * sizeof(u8));
175 if (ret < 0)
176 return ret;
177 /*
178 * The voltage value is located in 10 bits across the voltage MSB
179 * and LSB registers in two's compliment form
180 * Sign bit of the voltage value is in bit 7 of the voltage MSB register
181 * Bits 9 - 3 of the voltage value are in bits 6 - 0 of the
182 * voltage MSB register
183 * Bits 2 - 0 of the voltage value are in bits 7 - 5 of the
184 * voltage LSB register
185 */
186 voltage_raw = (val[0] << 3) |
187 (val[1] >> 5);
188
189 /* DS2781 reports voltage in units of 9.76mV, but the battery class
190 * reports in units of uV, so convert by multiplying by 9760. */
191 *voltage_uV = voltage_raw * 9760;
192
193 return 0;
194}
195
196static int ds2781_get_temperature(struct ds2781_device_info *dev_info,
197 int *temp)
198{
199 int ret;
200 char val[2];
201 int temp_raw;
202
203 ret = w1_ds2781_read(dev_info, val, DS2781_TEMP_MSB, 2 * sizeof(u8));
204 if (ret < 0)
205 return ret;
206 /*
207 * The temperature value is located in 10 bits across the temperature
208 * MSB and LSB registers in two's compliment form
209 * Sign bit of the temperature value is in bit 7 of the temperature
210 * MSB register
211 * Bits 9 - 3 of the temperature value are in bits 6 - 0 of the
212 * temperature MSB register
213 * Bits 2 - 0 of the temperature value are in bits 7 - 5 of the
214 * temperature LSB register
215 */
216 temp_raw = ((val[0]) << 3) |
217 (val[1] >> 5);
218 *temp = temp_raw + (temp_raw / 4);
219
220 return 0;
221}
222
223static int ds2781_get_current(struct ds2781_device_info *dev_info,
224 enum current_types type, int *current_uA)
225{
226 int ret, sense_res;
227 s16 current_raw;
228 u8 sense_res_raw, reg_msb;
229
230 /*
231 * The units of measurement for current are dependent on the value of
232 * the sense resistor.
233 */
234 ret = ds2781_read8(dev_info, &sense_res_raw, DS2781_RSNSP);
235 if (ret < 0)
236 return ret;
237
238 if (sense_res_raw == 0) {
239 dev_err(dev_info->dev, "sense resistor value is 0\n");
240 return -EINVAL;
241 }
242 sense_res = 1000 / sense_res_raw;
243
244 if (type == CURRENT_NOW)
245 reg_msb = DS2781_CURRENT_MSB;
246 else if (type == CURRENT_AVG)
247 reg_msb = DS2781_IAVG_MSB;
248 else
249 return -EINVAL;
250
251 /*
252 * The current value is located in 16 bits across the current MSB
253 * and LSB registers in two's compliment form
254 * Sign bit of the current value is in bit 7 of the current MSB register
255 * Bits 14 - 8 of the current value are in bits 6 - 0 of the current
256 * MSB register
257 * Bits 7 - 0 of the current value are in bits 7 - 0 of the current
258 * LSB register
259 */
260 ret = ds2781_read16(dev_info, &current_raw, reg_msb);
261 if (ret < 0)
262 return ret;
263
264 *current_uA = current_raw * (DS2781_CURRENT_UNITS / sense_res);
265 return 0;
266}
267
268static int ds2781_get_accumulated_current(struct ds2781_device_info *dev_info,
269 int *accumulated_current)
270{
271 int ret, sense_res;
272 s16 current_raw;
273 u8 sense_res_raw;
274
275 /*
276 * The units of measurement for accumulated current are dependent on
277 * the value of the sense resistor.
278 */
279 ret = ds2781_read8(dev_info, &sense_res_raw, DS2781_RSNSP);
280 if (ret < 0)
281 return ret;
282
283 if (sense_res_raw == 0) {
284 dev_err(dev_info->dev, "sense resistor value is 0\n");
285 return -EINVAL;
286 }
287 sense_res = 1000 / sense_res_raw;
288
289 /*
290 * The ACR value is located in 16 bits across the ACR MSB and
291 * LSB registers
292 * Bits 15 - 8 of the ACR value are in bits 7 - 0 of the ACR
293 * MSB register
294 * Bits 7 - 0 of the ACR value are in bits 7 - 0 of the ACR
295 * LSB register
296 */
297 ret = ds2781_read16(dev_info, &current_raw, DS2781_ACR_MSB);
298 if (ret < 0)
299 return ret;
300
301 *accumulated_current = current_raw * (DS2781_CHARGE_UNITS / sense_res);
302 return 0;
303}
304
305static int ds2781_get_capacity(struct ds2781_device_info *dev_info,
306 int *capacity)
307{
308 int ret;
309 u8 raw;
310
311 ret = ds2781_read8(dev_info, &raw, DS2781_RARC);
312 if (ret < 0)
313 return ret;
314
315 *capacity = raw;
316 return 0;
317}
318
319static int ds2781_get_status(struct ds2781_device_info *dev_info, int *status)
320{
321 int ret, current_uA, capacity;
322
323 ret = ds2781_get_current(dev_info, CURRENT_NOW, &current_uA);
324 if (ret < 0)
325 return ret;
326
327 ret = ds2781_get_capacity(dev_info, &capacity);
328 if (ret < 0)
329 return ret;
330
331 if (power_supply_am_i_supplied(&dev_info->bat)) {
332 if (capacity == 100)
333 *status = POWER_SUPPLY_STATUS_FULL;
334 else if (current_uA > 50000)
335 *status = POWER_SUPPLY_STATUS_CHARGING;
336 else
337 *status = POWER_SUPPLY_STATUS_NOT_CHARGING;
338 } else {
339 *status = POWER_SUPPLY_STATUS_DISCHARGING;
340 }
341 return 0;
342}
343
344static int ds2781_get_charge_now(struct ds2781_device_info *dev_info,
345 int *charge_now)
346{
347 int ret;
348 u16 charge_raw;
349
350 /*
351 * The RAAC value is located in 16 bits across the RAAC MSB and
352 * LSB registers
353 * Bits 15 - 8 of the RAAC value are in bits 7 - 0 of the RAAC
354 * MSB register
355 * Bits 7 - 0 of the RAAC value are in bits 7 - 0 of the RAAC
356 * LSB register
357 */
358 ret = ds2781_read16(dev_info, &charge_raw, DS2781_RAAC_MSB);
359 if (ret < 0)
360 return ret;
361
362 *charge_now = charge_raw * 1600;
363 return 0;
364}
365
366static int ds2781_get_control_register(struct ds2781_device_info *dev_info,
367 u8 *control_reg)
368{
369 return ds2781_read8(dev_info, control_reg, DS2781_CONTROL);
370}
371
372static int ds2781_set_control_register(struct ds2781_device_info *dev_info,
373 u8 control_reg)
374{
375 int ret;
376
377 ret = ds2781_write(dev_info, &control_reg,
378 DS2781_CONTROL, sizeof(u8));
379 if (ret < 0)
380 return ret;
381
382 return ds2781_save_eeprom(dev_info, DS2781_CONTROL);
383}
384
385static int ds2781_battery_get_property(struct power_supply *psy,
386 enum power_supply_property psp,
387 union power_supply_propval *val)
388{
389 int ret = 0;
390 struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
391
392 switch (psp) {
393 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
394 ret = ds2781_get_voltage(dev_info, &val->intval);
395 break;
396
397 case POWER_SUPPLY_PROP_TEMP:
398 ret = ds2781_get_temperature(dev_info, &val->intval);
399 break;
400
401 case POWER_SUPPLY_PROP_MODEL_NAME:
402 val->strval = model;
403 break;
404
405 case POWER_SUPPLY_PROP_MANUFACTURER:
406 val->strval = manufacturer;
407 break;
408
409 case POWER_SUPPLY_PROP_CURRENT_NOW:
410 ret = ds2781_get_current(dev_info, CURRENT_NOW, &val->intval);
411 break;
412
413 case POWER_SUPPLY_PROP_CURRENT_AVG:
414 ret = ds2781_get_current(dev_info, CURRENT_AVG, &val->intval);
415 break;
416
417 case POWER_SUPPLY_PROP_STATUS:
418 ret = ds2781_get_status(dev_info, &val->intval);
419 break;
420
421 case POWER_SUPPLY_PROP_CAPACITY:
422 ret = ds2781_get_capacity(dev_info, &val->intval);
423 break;
424
425 case POWER_SUPPLY_PROP_CHARGE_COUNTER:
426 ret = ds2781_get_accumulated_current(dev_info, &val->intval);
427 break;
428
429 case POWER_SUPPLY_PROP_CHARGE_NOW:
430 ret = ds2781_get_charge_now(dev_info, &val->intval);
431 break;
432
433 default:
434 ret = -EINVAL;
435 }
436
437 return ret;
438}
439
440static enum power_supply_property ds2781_battery_props[] = {
441 POWER_SUPPLY_PROP_STATUS,
442 POWER_SUPPLY_PROP_VOLTAGE_NOW,
443 POWER_SUPPLY_PROP_TEMP,
444 POWER_SUPPLY_PROP_MODEL_NAME,
445 POWER_SUPPLY_PROP_MANUFACTURER,
446 POWER_SUPPLY_PROP_CURRENT_NOW,
447 POWER_SUPPLY_PROP_CURRENT_AVG,
448 POWER_SUPPLY_PROP_CAPACITY,
449 POWER_SUPPLY_PROP_CHARGE_COUNTER,
450 POWER_SUPPLY_PROP_CHARGE_NOW,
451};
452
453static ssize_t ds2781_get_pmod_enabled(struct device *dev,
454 struct device_attribute *attr,
455 char *buf)
456{
457 int ret;
458 u8 control_reg;
459 struct power_supply *psy = to_power_supply(dev);
460 struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
461
462 /* Get power mode */
463 ret = ds2781_get_control_register(dev_info, &control_reg);
464 if (ret < 0)
465 return ret;
466
467 return sprintf(buf, "%d\n",
468 !!(control_reg & DS2781_CONTROL_PMOD));
469}
470
471static ssize_t ds2781_set_pmod_enabled(struct device *dev,
472 struct device_attribute *attr,
473 const char *buf,
474 size_t count)
475{
476 int ret;
477 u8 control_reg, new_setting;
478 struct power_supply *psy = to_power_supply(dev);
479 struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
480
481 /* Set power mode */
482 ret = ds2781_get_control_register(dev_info, &control_reg);
483 if (ret < 0)
484 return ret;
485
486 ret = kstrtou8(buf, 0, &new_setting);
487 if (ret < 0)
488 return ret;
489
490 if ((new_setting != 0) && (new_setting != 1)) {
491 dev_err(dev_info->dev, "Invalid pmod setting (0 or 1)\n");
492 return -EINVAL;
493 }
494
495 if (new_setting)
496 control_reg |= DS2781_CONTROL_PMOD;
497 else
498 control_reg &= ~DS2781_CONTROL_PMOD;
499
500 ret = ds2781_set_control_register(dev_info, control_reg);
501 if (ret < 0)
502 return ret;
503
504 return count;
505}
506
507static ssize_t ds2781_get_sense_resistor_value(struct device *dev,
508 struct device_attribute *attr,
509 char *buf)
510{
511 int ret;
512 u8 sense_resistor;
513 struct power_supply *psy = to_power_supply(dev);
514 struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
515
516 ret = ds2781_read8(dev_info, &sense_resistor, DS2781_RSNSP);
517 if (ret < 0)
518 return ret;
519
520 ret = sprintf(buf, "%d\n", sense_resistor);
521 return ret;
522}
523
524static ssize_t ds2781_set_sense_resistor_value(struct device *dev,
525 struct device_attribute *attr,
526 const char *buf,
527 size_t count)
528{
529 int ret;
530 u8 new_setting;
531 struct power_supply *psy = to_power_supply(dev);
532 struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
533
534 ret = kstrtou8(buf, 0, &new_setting);
535 if (ret < 0)
536 return ret;
537
538 ret = ds2781_set_sense_register(dev_info, new_setting);
539 if (ret < 0)
540 return ret;
541
542 return count;
543}
544
545static ssize_t ds2781_get_rsgain_setting(struct device *dev,
546 struct device_attribute *attr,
547 char *buf)
548{
549 int ret;
550 u16 rsgain;
551 struct power_supply *psy = to_power_supply(dev);
552 struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
553
554 ret = ds2781_get_rsgain_register(dev_info, &rsgain);
555 if (ret < 0)
556 return ret;
557
558 return sprintf(buf, "%d\n", rsgain);
559}
560
561static ssize_t ds2781_set_rsgain_setting(struct device *dev,
562 struct device_attribute *attr,
563 const char *buf,
564 size_t count)
565{
566 int ret;
567 u16 new_setting;
568 struct power_supply *psy = to_power_supply(dev);
569 struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
570
571 ret = kstrtou16(buf, 0, &new_setting);
572 if (ret < 0)
573 return ret;
574
575 /* Gain can only be from 0 to 1.999 in steps of .001 */
576 if (new_setting > 1999) {
577 dev_err(dev_info->dev, "Invalid rsgain setting (0 - 1999)\n");
578 return -EINVAL;
579 }
580
581 ret = ds2781_set_rsgain_register(dev_info, new_setting);
582 if (ret < 0)
583 return ret;
584
585 return count;
586}
587
588static ssize_t ds2781_get_pio_pin(struct device *dev,
589 struct device_attribute *attr,
590 char *buf)
591{
592 int ret;
593 u8 sfr;
594 struct power_supply *psy = to_power_supply(dev);
595 struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
596
597 ret = ds2781_read8(dev_info, &sfr, DS2781_SFR);
598 if (ret < 0)
599 return ret;
600
601 ret = sprintf(buf, "%d\n", sfr & DS2781_SFR_PIOSC);
602 return ret;
603}
604
605static ssize_t ds2781_set_pio_pin(struct device *dev,
606 struct device_attribute *attr,
607 const char *buf,
608 size_t count)
609{
610 int ret;
611 u8 new_setting;
612 struct power_supply *psy = to_power_supply(dev);
613 struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
614
615 ret = kstrtou8(buf, 0, &new_setting);
616 if (ret < 0)
617 return ret;
618
619 if ((new_setting != 0) && (new_setting != 1)) {
620 dev_err(dev_info->dev, "Invalid pio_pin setting (0 or 1)\n");
621 return -EINVAL;
622 }
623
624 ret = ds2781_write(dev_info, &new_setting,
625 DS2781_SFR, sizeof(u8));
626 if (ret < 0)
627 return ret;
628
629 return count;
630}
631
632static ssize_t ds2781_read_param_eeprom_bin(struct file *filp,
633 struct kobject *kobj,
634 struct bin_attribute *bin_attr,
635 char *buf, loff_t off, size_t count)
636{
637 struct device *dev = container_of(kobj, struct device, kobj);
638 struct power_supply *psy = to_power_supply(dev);
639 struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
640
13f2483c 641 count = min_t(loff_t, count, DS2781_PARAM_EEPROM_SIZE - off);
fef37e9a
RS		 642
643 return ds2781_read_block(dev_info, buf,
644 DS2781_EEPROM_BLOCK1_START + off, count);
645}
646
647static ssize_t ds2781_write_param_eeprom_bin(struct file *filp,
648 struct kobject *kobj,
649 struct bin_attribute *bin_attr,
650 char *buf, loff_t off, size_t count)
651{
652 struct device *dev = container_of(kobj, struct device, kobj);
653 struct power_supply *psy = to_power_supply(dev);
654 struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
655 int ret;
656
13f2483c 657 count = min_t(loff_t, count, DS2781_PARAM_EEPROM_SIZE - off);
fef37e9a
RS		 658
659 ret = ds2781_write(dev_info, buf,
660 DS2781_EEPROM_BLOCK1_START + off, count);
661 if (ret < 0)
662 return ret;
663
664 ret = ds2781_save_eeprom(dev_info, DS2781_EEPROM_BLOCK1_START);
665 if (ret < 0)
666 return ret;
667
668 return count;
669}
670
671static struct bin_attribute ds2781_param_eeprom_bin_attr = {
672 .attr = {
673 .name = "param_eeprom",
674 .mode = S_IRUGO | S_IWUSR,
675 },
13f2483c 676 .size = DS2781_PARAM_EEPROM_SIZE,
fef37e9a
RS		 677 .read = ds2781_read_param_eeprom_bin,
678 .write = ds2781_write_param_eeprom_bin,
679};
680
681static ssize_t ds2781_read_user_eeprom_bin(struct file *filp,
682 struct kobject *kobj,
683 struct bin_attribute *bin_attr,
684 char *buf, loff_t off, size_t count)
685{
686 struct device *dev = container_of(kobj, struct device, kobj);
687 struct power_supply *psy = to_power_supply(dev);
688 struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
689
13f2483c 690 count = min_t(loff_t, count, DS2781_USER_EEPROM_SIZE - off);
fef37e9a
RS		 691
692 return ds2781_read_block(dev_info, buf,
693 DS2781_EEPROM_BLOCK0_START + off, count);
694
695}
696
697static ssize_t ds2781_write_user_eeprom_bin(struct file *filp,
698 struct kobject *kobj,
699 struct bin_attribute *bin_attr,
700 char *buf, loff_t off, size_t count)
701{
702 struct device *dev = container_of(kobj, struct device, kobj);
703 struct power_supply *psy = to_power_supply(dev);
704 struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
705 int ret;
706
13f2483c 707 count = min_t(loff_t, count, DS2781_USER_EEPROM_SIZE - off);
fef37e9a
RS		 708
709 ret = ds2781_write(dev_info, buf,
710 DS2781_EEPROM_BLOCK0_START + off, count);
711 if (ret < 0)
712 return ret;
713
714 ret = ds2781_save_eeprom(dev_info, DS2781_EEPROM_BLOCK0_START);
715 if (ret < 0)
716 return ret;
717
718 return count;
719}
720
721static struct bin_attribute ds2781_user_eeprom_bin_attr = {
722 .attr = {
723 .name = "user_eeprom",
724 .mode = S_IRUGO | S_IWUSR,
725 },
13f2483c 726 .size = DS2781_USER_EEPROM_SIZE,
fef37e9a
RS		 727 .read = ds2781_read_user_eeprom_bin,
728 .write = ds2781_write_user_eeprom_bin,
729};
730
731static DEVICE_ATTR(pmod_enabled, S_IRUGO | S_IWUSR, ds2781_get_pmod_enabled,
732 ds2781_set_pmod_enabled);
733static DEVICE_ATTR(sense_resistor_value, S_IRUGO | S_IWUSR,
734 ds2781_get_sense_resistor_value, ds2781_set_sense_resistor_value);
735static DEVICE_ATTR(rsgain_setting, S_IRUGO | S_IWUSR, ds2781_get_rsgain_setting,
736 ds2781_set_rsgain_setting);
737static DEVICE_ATTR(pio_pin, S_IRUGO | S_IWUSR, ds2781_get_pio_pin,
738 ds2781_set_pio_pin);
739
740
741static struct attribute *ds2781_attributes[] = {
742 &dev_attr_pmod_enabled.attr,
743 &dev_attr_sense_resistor_value.attr,
744 &dev_attr_rsgain_setting.attr,
745 &dev_attr_pio_pin.attr,
746 NULL
747};
748
749static const struct attribute_group ds2781_attr_group = {
750 .attrs = ds2781_attributes,
751};
752
c8afa640 753static int ds2781_battery_probe(struct platform_device *pdev)
fef37e9a
RS		 754{
755 int ret = 0;
756 struct ds2781_device_info *dev_info;
757
deacc4fe
DN		 758 dev_info = devm_kzalloc(&pdev->dev, sizeof(*dev_info), GFP_KERNEL);
759 if (!dev_info)
760 return -ENOMEM;
fef37e9a
RS		 761
762 platform_set_drvdata(pdev, dev_info);
763
764 dev_info->dev = &pdev->dev;
765 dev_info->w1_dev = pdev->dev.parent;
766 dev_info->bat.name = dev_name(&pdev->dev);
767 dev_info->bat.type = POWER_SUPPLY_TYPE_BATTERY;
768 dev_info->bat.properties = ds2781_battery_props;
769 dev_info->bat.num_properties = ARRAY_SIZE(ds2781_battery_props);
770 dev_info->bat.get_property = ds2781_battery_get_property;
fef37e9a
RS		 771
772 ret = power_supply_register(&pdev->dev, &dev_info->bat);
773 if (ret) {
774 dev_err(dev_info->dev, "failed to register battery\n");
deacc4fe 775 goto fail;
fef37e9a
RS		 776 }
777
778 ret = sysfs_create_group(&dev_info->bat.dev->kobj, &ds2781_attr_group);
779 if (ret) {
780 dev_err(dev_info->dev, "failed to create sysfs group\n");
781 goto fail_unregister;
782 }
783
784 ret = sysfs_create_bin_file(&dev_info->bat.dev->kobj,
785 &ds2781_param_eeprom_bin_attr);
786 if (ret) {
787 dev_err(dev_info->dev,
788 "failed to create param eeprom bin file");
789 goto fail_remove_group;
790 }
791
792 ret = sysfs_create_bin_file(&dev_info->bat.dev->kobj,
793 &ds2781_user_eeprom_bin_attr);
794 if (ret) {
795 dev_err(dev_info->dev,
796 "failed to create user eeprom bin file");
797 goto fail_remove_bin_file;
798 }
799
fef37e9a
RS		 800 return 0;
801
802fail_remove_bin_file:
803 sysfs_remove_bin_file(&dev_info->bat.dev->kobj,
804 &ds2781_param_eeprom_bin_attr);
805fail_remove_group:
806 sysfs_remove_group(&dev_info->bat.dev->kobj, &ds2781_attr_group);
807fail_unregister:
808 power_supply_unregister(&dev_info->bat);
fef37e9a
RS		 809fail:
810 return ret;
811}
812
415ec69f 813static int ds2781_battery_remove(struct platform_device *pdev)
fef37e9a
RS		 814{
815 struct ds2781_device_info *dev_info = platform_get_drvdata(pdev);
816
fef37e9a
RS		 817 /* remove attributes */
818 sysfs_remove_group(&dev_info->bat.dev->kobj, &ds2781_attr_group);
819
820 power_supply_unregister(&dev_info->bat);
821
fef37e9a
RS		 822 return 0;
823}
824
825static struct platform_driver ds2781_battery_driver = {
826 .driver = {
827 .name = "ds2781-battery",
828 },
829 .probe = ds2781_battery_probe,
28ea73f4 830 .remove = ds2781_battery_remove,
fef37e9a 831};
bc6e51d8 832module_platform_driver(ds2781_battery_driver);
fef37e9a
RS		 833
834MODULE_LICENSE("GPL");
835MODULE_AUTHOR("Renata Sayakhova <renata@oktetlabs.ru>");
836MODULE_DESCRIPTION("Maxim/Dallas DS2781 Stand-Alone Fuel Gauage IC driver");
837MODULE_ALIAS("platform:ds2781-battery");
838
kernel source for telekom puls (alcatel/mediatek)