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kernel/panic.c: turn off locks debug before releasing console lock
[linux-2.6-block.git] / drivers / power / ds2780_battery.c
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275ac746
CB		 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 "../w1/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
38struct ds2780_device_info {
39 struct device *dev;
297d716f
KK		 40 struct power_supply *bat;
41 struct power_supply_desc bat_desc;
275ac746
CB		 42 struct device *w1_dev;
43};
44
45enum current_types {
46 CURRENT_NOW,
47 CURRENT_AVG,
48};
49
50static const char model[] = "DS2780";
51static const char manufacturer[] = "Maxim/Dallas";
52
853eee72
CB		 53static inline struct ds2780_device_info *
54to_ds2780_device_info(struct power_supply *psy)
275ac746 55{
297d716f 56 return power_supply_get_drvdata(psy);
275ac746
CB		 57}
58
59static inline struct power_supply *to_power_supply(struct device *dev)
60{
61 return dev_get_drvdata(dev);
62}
63
853eee72
CB		 64static inline int ds2780_battery_io(struct ds2780_device_info *dev_info,
65 char *buf, int addr, size_t count, int io)
275ac746 66{
b02f8bed 67 return w1_ds2780_io(dev_info->w1_dev, buf, addr, count, io);
275ac746
CB		 68}
69
853eee72
CB		 70static inline int ds2780_read8(struct ds2780_device_info *dev_info, u8 *val,
71 int addr)
72{
73 return ds2780_battery_io(dev_info, val, addr, sizeof(u8), 0);
275ac746
CB		 74}
75
853eee72
CB		 76static int ds2780_read16(struct ds2780_device_info *dev_info, s16 *val,
77 int addr)
275ac746
CB		 78{
79 int ret;
80 u8 raw[2];
81
853eee72 82 ret = ds2780_battery_io(dev_info, raw, addr, sizeof(raw), 0);
275ac746
CB		 83 if (ret < 0)
84 return ret;
85
86 *val = (raw[0] << 8) | raw[1];
87
88 return 0;
89}
90
853eee72
CB		 91static inline int ds2780_read_block(struct ds2780_device_info *dev_info,
92 u8 *val, int addr, size_t count)
275ac746 93{
853eee72 94 return ds2780_battery_io(dev_info, val, addr, count, 0);
275ac746
CB		 95}
96
853eee72
CB		 97static inline int ds2780_write(struct ds2780_device_info *dev_info, u8 *val,
98 int addr, size_t count)
275ac746 99{
853eee72 100 return ds2780_battery_io(dev_info, val, addr, count, 1);
275ac746
CB		 101}
102
103static inline int ds2780_store_eeprom(struct device *dev, int addr)
104{
105 return w1_ds2780_eeprom_cmd(dev, addr, W1_DS2780_COPY_DATA);
106}
107
108static inline int ds2780_recall_eeprom(struct device *dev, int addr)
109{
110 return w1_ds2780_eeprom_cmd(dev, addr, W1_DS2780_RECALL_DATA);
111}
112
113static int ds2780_save_eeprom(struct ds2780_device_info *dev_info, int reg)
114{
115 int ret;
116
117 ret = ds2780_store_eeprom(dev_info->w1_dev, reg);
118 if (ret < 0)
119 return ret;
120
121 ret = ds2780_recall_eeprom(dev_info->w1_dev, reg);
122 if (ret < 0)
123 return ret;
124
125 return 0;
126}
127
128/* Set sense resistor value in mhos */
129static int ds2780_set_sense_register(struct ds2780_device_info *dev_info,
130 u8 conductance)
131{
132 int ret;
133
853eee72 134 ret = ds2780_write(dev_info, &conductance,
275ac746
CB		 135 DS2780_RSNSP_REG, sizeof(u8));
136 if (ret < 0)
137 return ret;
138
139 return ds2780_save_eeprom(dev_info, DS2780_RSNSP_REG);
140}
141
142/* Get RSGAIN value from 0 to 1.999 in steps of 0.001 */
143static int ds2780_get_rsgain_register(struct ds2780_device_info *dev_info,
144 u16 *rsgain)
145{
853eee72 146 return ds2780_read16(dev_info, rsgain, DS2780_RSGAIN_MSB_REG);
275ac746
CB		 147}
148
149/* Set RSGAIN value from 0 to 1.999 in steps of 0.001 */
150static int ds2780_set_rsgain_register(struct ds2780_device_info *dev_info,
151 u16 rsgain)
152{
153 int ret;
154 u8 raw[] = {rsgain >> 8, rsgain & 0xFF};
155
853eee72
CB		 156 ret = ds2780_write(dev_info, raw,
157 DS2780_RSGAIN_MSB_REG, sizeof(raw));
275ac746
CB		 158 if (ret < 0)
159 return ret;
160
161 return ds2780_save_eeprom(dev_info, DS2780_RSGAIN_MSB_REG);
162}
163
164static int ds2780_get_voltage(struct ds2780_device_info *dev_info,
165 int *voltage_uV)
166{
167 int ret;
168 s16 voltage_raw;
169
170 /*
171 * The voltage value is located in 10 bits across the voltage MSB
172 * and LSB registers in two's compliment form
173 * Sign bit of the voltage value is in bit 7 of the voltage MSB register
174 * Bits 9 - 3 of the voltage value are in bits 6 - 0 of the
175 * voltage MSB register
176 * Bits 2 - 0 of the voltage value are in bits 7 - 5 of the
177 * voltage LSB register
178 */
853eee72 179 ret = ds2780_read16(dev_info, &voltage_raw,
275ac746
CB		 180 DS2780_VOLT_MSB_REG);
181 if (ret < 0)
182 return ret;
183
184 /*
185 * DS2780 reports voltage in units of 4.88mV, but the battery class
186 * reports in units of uV, so convert by multiplying by 4880.
187 */
188 *voltage_uV = (voltage_raw / 32) * 4880;
189 return 0;
190}
191
192static int ds2780_get_temperature(struct ds2780_device_info *dev_info,
193 int *temperature)
194{
195 int ret;
196 s16 temperature_raw;
197
198 /*
199 * The temperature value is located in 10 bits across the temperature
200 * MSB and LSB registers in two's compliment form
201 * Sign bit of the temperature value is in bit 7 of the temperature
202 * MSB register
203 * Bits 9 - 3 of the temperature value are in bits 6 - 0 of the
204 * temperature MSB register
205 * Bits 2 - 0 of the temperature value are in bits 7 - 5 of the
206 * temperature LSB register
207 */
853eee72 208 ret = ds2780_read16(dev_info, &temperature_raw,
275ac746
CB		 209 DS2780_TEMP_MSB_REG);
210 if (ret < 0)
211 return ret;
212
213 /*
214 * Temperature is measured in units of 0.125 degrees celcius, the
215 * power_supply class measures temperature in tenths of degrees
216 * celsius. The temperature value is stored as a 10 bit number, plus
217 * sign in the upper bits of a 16 bit register.
218 */
219 *temperature = ((temperature_raw / 32) * 125) / 100;
220 return 0;
221}
222
223static int ds2780_get_current(struct ds2780_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 */
853eee72 234 ret = ds2780_read8(dev_info, &sense_res_raw, DS2780_RSNSP_REG);
275ac746
CB		 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");
853eee72 240 return -EINVAL;
275ac746
CB		 241 }
242 sense_res = 1000 / sense_res_raw;
243
244 if (type == CURRENT_NOW)
245 reg_msb = DS2780_CURRENT_MSB_REG;
246 else if (type == CURRENT_AVG)
247 reg_msb = DS2780_IAVG_MSB_REG;
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 */
853eee72 260 ret = ds2780_read16(dev_info, &current_raw, reg_msb);
275ac746
CB		 261 if (ret < 0)
262 return ret;
263
264 *current_uA = current_raw * (DS2780_CURRENT_UNITS / sense_res);
265 return 0;
266}
267
268static int ds2780_get_accumulated_current(struct ds2780_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 */
853eee72 279 ret = ds2780_read8(dev_info, &sense_res_raw, DS2780_RSNSP_REG);
275ac746
CB		 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 -ENXIO;
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 */
853eee72 297 ret = ds2780_read16(dev_info, &current_raw, DS2780_ACR_MSB_REG);
275ac746
CB		 298 if (ret < 0)
299 return ret;
300
301 *accumulated_current = current_raw * (DS2780_CHARGE_UNITS / sense_res);
302 return 0;
303}
304
305static int ds2780_get_capacity(struct ds2780_device_info *dev_info,
306 int *capacity)
307{
308 int ret;
309 u8 raw;
310
853eee72 311 ret = ds2780_read8(dev_info, &raw, DS2780_RARC_REG);
275ac746
CB		 312 if (ret < 0)
313 return ret;
314
315 *capacity = raw;
316 return raw;
317}
318
319static int ds2780_get_status(struct ds2780_device_info *dev_info, int *status)
320{
321 int ret, current_uA, capacity;
322
323 ret = ds2780_get_current(dev_info, CURRENT_NOW, &current_uA);
324 if (ret < 0)
325 return ret;
326
327 ret = ds2780_get_capacity(dev_info, &capacity);
328 if (ret < 0)
329 return ret;
330
331 if (capacity == 100)
332 *status = POWER_SUPPLY_STATUS_FULL;
333 else if (current_uA == 0)
334 *status = POWER_SUPPLY_STATUS_NOT_CHARGING;
335 else if (current_uA < 0)
336 *status = POWER_SUPPLY_STATUS_DISCHARGING;
337 else
338 *status = POWER_SUPPLY_STATUS_CHARGING;
339
340 return 0;
341}
342
343static int ds2780_get_charge_now(struct ds2780_device_info *dev_info,
344 int *charge_now)
345{
346 int ret;
347 u16 charge_raw;
348
349 /*
350 * The RAAC value is located in 16 bits across the RAAC MSB and
351 * LSB registers
352 * Bits 15 - 8 of the RAAC value are in bits 7 - 0 of the RAAC
353 * MSB register
354 * Bits 7 - 0 of the RAAC value are in bits 7 - 0 of the RAAC
355 * LSB register
356 */
853eee72 357 ret = ds2780_read16(dev_info, &charge_raw, DS2780_RAAC_MSB_REG);
275ac746
CB		 358 if (ret < 0)
359 return ret;
360
361 *charge_now = charge_raw * 1600;
362 return 0;
363}
364
365static int ds2780_get_control_register(struct ds2780_device_info *dev_info,
366 u8 *control_reg)
367{
853eee72 368 return ds2780_read8(dev_info, control_reg, DS2780_CONTROL_REG);
275ac746
CB		 369}
370
371static int ds2780_set_control_register(struct ds2780_device_info *dev_info,
372 u8 control_reg)
373{
374 int ret;
375
853eee72 376 ret = ds2780_write(dev_info, &control_reg,
275ac746
CB		 377 DS2780_CONTROL_REG, sizeof(u8));
378 if (ret < 0)
379 return ret;
380
381 return ds2780_save_eeprom(dev_info, DS2780_CONTROL_REG);
382}
383
384static int ds2780_battery_get_property(struct power_supply *psy,
385 enum power_supply_property psp,
386 union power_supply_propval *val)
387{
388 int ret = 0;
389 struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
390
391 switch (psp) {
392 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
393 ret = ds2780_get_voltage(dev_info, &val->intval);
394 break;
395
396 case POWER_SUPPLY_PROP_TEMP:
397 ret = ds2780_get_temperature(dev_info, &val->intval);
398 break;
399
400 case POWER_SUPPLY_PROP_MODEL_NAME:
401 val->strval = model;
402 break;
403
404 case POWER_SUPPLY_PROP_MANUFACTURER:
405 val->strval = manufacturer;
406 break;
407
408 case POWER_SUPPLY_PROP_CURRENT_NOW:
409 ret = ds2780_get_current(dev_info, CURRENT_NOW, &val->intval);
410 break;
411
412 case POWER_SUPPLY_PROP_CURRENT_AVG:
413 ret = ds2780_get_current(dev_info, CURRENT_AVG, &val->intval);
414 break;
415
416 case POWER_SUPPLY_PROP_STATUS:
417 ret = ds2780_get_status(dev_info, &val->intval);
418 break;
419
420 case POWER_SUPPLY_PROP_CAPACITY:
421 ret = ds2780_get_capacity(dev_info, &val->intval);
422 break;
423
424 case POWER_SUPPLY_PROP_CHARGE_COUNTER:
425 ret = ds2780_get_accumulated_current(dev_info, &val->intval);
426 break;
427
428 case POWER_SUPPLY_PROP_CHARGE_NOW:
429 ret = ds2780_get_charge_now(dev_info, &val->intval);
430 break;
431
432 default:
433 ret = -EINVAL;
434 }
435
436 return ret;
437}
438
439static enum power_supply_property ds2780_battery_props[] = {
440 POWER_SUPPLY_PROP_STATUS,
441 POWER_SUPPLY_PROP_VOLTAGE_NOW,
442 POWER_SUPPLY_PROP_TEMP,
443 POWER_SUPPLY_PROP_MODEL_NAME,
444 POWER_SUPPLY_PROP_MANUFACTURER,
445 POWER_SUPPLY_PROP_CURRENT_NOW,
446 POWER_SUPPLY_PROP_CURRENT_AVG,
447 POWER_SUPPLY_PROP_CAPACITY,
448 POWER_SUPPLY_PROP_CHARGE_COUNTER,
449 POWER_SUPPLY_PROP_CHARGE_NOW,
450};
451
452static ssize_t ds2780_get_pmod_enabled(struct device *dev,
453 struct device_attribute *attr,
454 char *buf)
455{
456 int ret;
457 u8 control_reg;
458 struct power_supply *psy = to_power_supply(dev);
459 struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
460
461 /* Get power mode */
462 ret = ds2780_get_control_register(dev_info, &control_reg);
463 if (ret < 0)
464 return ret;
465
466 return sprintf(buf, "%d\n",
467 !!(control_reg & DS2780_CONTROL_REG_PMOD));
468}
469
470static ssize_t ds2780_set_pmod_enabled(struct device *dev,
471 struct device_attribute *attr,
472 const char *buf,
473 size_t count)
474{
475 int ret;
476 u8 control_reg, new_setting;
477 struct power_supply *psy = to_power_supply(dev);
478 struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
479
480 /* Set power mode */
481 ret = ds2780_get_control_register(dev_info, &control_reg);
482 if (ret < 0)
483 return ret;
484
485 ret = kstrtou8(buf, 0, &new_setting);
486 if (ret < 0)
487 return ret;
488
489 if ((new_setting != 0) && (new_setting != 1)) {
490 dev_err(dev_info->dev, "Invalid pmod setting (0 or 1)\n");
491 return -EINVAL;
492 }
493
494 if (new_setting)
495 control_reg |= DS2780_CONTROL_REG_PMOD;
496 else
497 control_reg &= ~DS2780_CONTROL_REG_PMOD;
498
499 ret = ds2780_set_control_register(dev_info, control_reg);
500 if (ret < 0)
501 return ret;
502
503 return count;
504}
505
506static ssize_t ds2780_get_sense_resistor_value(struct device *dev,
507 struct device_attribute *attr,
508 char *buf)
509{
510 int ret;
511 u8 sense_resistor;
512 struct power_supply *psy = to_power_supply(dev);
513 struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
514
853eee72 515 ret = ds2780_read8(dev_info, &sense_resistor, DS2780_RSNSP_REG);
275ac746
CB		 516 if (ret < 0)
517 return ret;
518
519 ret = sprintf(buf, "%d\n", sense_resistor);
520 return ret;
521}
522
523static ssize_t ds2780_set_sense_resistor_value(struct device *dev,
524 struct device_attribute *attr,
525 const char *buf,
526 size_t count)
527{
528 int ret;
529 u8 new_setting;
530 struct power_supply *psy = to_power_supply(dev);
531 struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
532
533 ret = kstrtou8(buf, 0, &new_setting);
534 if (ret < 0)
535 return ret;
536
537 ret = ds2780_set_sense_register(dev_info, new_setting);
538 if (ret < 0)
539 return ret;
540
541 return count;
542}
543
544static ssize_t ds2780_get_rsgain_setting(struct device *dev,
545 struct device_attribute *attr,
546 char *buf)
547{
548 int ret;
549 u16 rsgain;
550 struct power_supply *psy = to_power_supply(dev);
551 struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
552
553 ret = ds2780_get_rsgain_register(dev_info, &rsgain);
554 if (ret < 0)
555 return ret;
556
557 return sprintf(buf, "%d\n", rsgain);
558}
559
560static ssize_t ds2780_set_rsgain_setting(struct device *dev,
561 struct device_attribute *attr,
562 const char *buf,
563 size_t count)
564{
565 int ret;
566 u16 new_setting;
567 struct power_supply *psy = to_power_supply(dev);
568 struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
569
570 ret = kstrtou16(buf, 0, &new_setting);
571 if (ret < 0)
572 return ret;
573
574 /* Gain can only be from 0 to 1.999 in steps of .001 */
575 if (new_setting > 1999) {
576 dev_err(dev_info->dev, "Invalid rsgain setting (0 - 1999)\n");
577 return -EINVAL;
578 }
579
580 ret = ds2780_set_rsgain_register(dev_info, new_setting);
581 if (ret < 0)
582 return ret;
583
584 return count;
585}
586
587static ssize_t ds2780_get_pio_pin(struct device *dev,
588 struct device_attribute *attr,
589 char *buf)
590{
591 int ret;
592 u8 sfr;
593 struct power_supply *psy = to_power_supply(dev);
594 struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
595
853eee72 596 ret = ds2780_read8(dev_info, &sfr, DS2780_SFR_REG);
275ac746
CB		 597 if (ret < 0)
598 return ret;
599
600 ret = sprintf(buf, "%d\n", sfr & DS2780_SFR_REG_PIOSC);
601 return ret;
602}
603
604static ssize_t ds2780_set_pio_pin(struct device *dev,
605 struct device_attribute *attr,
606 const char *buf,
607 size_t count)
608{
609 int ret;
610 u8 new_setting;
611 struct power_supply *psy = to_power_supply(dev);
612 struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
613
614 ret = kstrtou8(buf, 0, &new_setting);
615 if (ret < 0)
616 return ret;
617
618 if ((new_setting != 0) && (new_setting != 1)) {
619 dev_err(dev_info->dev, "Invalid pio_pin setting (0 or 1)\n");
620 return -EINVAL;
621 }
622
853eee72 623 ret = ds2780_write(dev_info, &new_setting,
275ac746
CB		 624 DS2780_SFR_REG, sizeof(u8));
625 if (ret < 0)
626 return ret;
627
628 return count;
629}
630
631static ssize_t ds2780_read_param_eeprom_bin(struct file *filp,
632 struct kobject *kobj,
633 struct bin_attribute *bin_attr,
634 char *buf, loff_t off, size_t count)
635{
636 struct device *dev = container_of(kobj, struct device, kobj);
637 struct power_supply *psy = to_power_supply(dev);
638 struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
639
853eee72 640 return ds2780_read_block(dev_info, buf,
275ac746
CB		 641 DS2780_EEPROM_BLOCK1_START + off, count);
642}
643
644static ssize_t ds2780_write_param_eeprom_bin(struct file *filp,
645 struct kobject *kobj,
646 struct bin_attribute *bin_attr,
647 char *buf, loff_t off, size_t count)
648{
649 struct device *dev = container_of(kobj, struct device, kobj);
650 struct power_supply *psy = to_power_supply(dev);
651 struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
652 int ret;
653
853eee72 654 ret = ds2780_write(dev_info, buf,
275ac746
CB		 655 DS2780_EEPROM_BLOCK1_START + off, count);
656 if (ret < 0)
657 return ret;
658
659 ret = ds2780_save_eeprom(dev_info, DS2780_EEPROM_BLOCK1_START);
660 if (ret < 0)
661 return ret;
662
663 return count;
664}
665
666static struct bin_attribute ds2780_param_eeprom_bin_attr = {
667 .attr = {
668 .name = "param_eeprom",
669 .mode = S_IRUGO | S_IWUSR,
670 },
753f1583 671 .size = DS2780_PARAM_EEPROM_SIZE,
275ac746
CB		 672 .read = ds2780_read_param_eeprom_bin,
673 .write = ds2780_write_param_eeprom_bin,
674};
675
676static ssize_t ds2780_read_user_eeprom_bin(struct file *filp,
677 struct kobject *kobj,
678 struct bin_attribute *bin_attr,
679 char *buf, loff_t off, size_t count)
680{
681 struct device *dev = container_of(kobj, struct device, kobj);
682 struct power_supply *psy = to_power_supply(dev);
683 struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
684
853eee72 685 return ds2780_read_block(dev_info, buf,
275ac746 686 DS2780_EEPROM_BLOCK0_START + off, count);
275ac746
CB		 687}
688
689static ssize_t ds2780_write_user_eeprom_bin(struct file *filp,
690 struct kobject *kobj,
691 struct bin_attribute *bin_attr,
692 char *buf, loff_t off, size_t count)
693{
694 struct device *dev = container_of(kobj, struct device, kobj);
695 struct power_supply *psy = to_power_supply(dev);
696 struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
697 int ret;
698
853eee72 699 ret = ds2780_write(dev_info, buf,
275ac746
CB		 700 DS2780_EEPROM_BLOCK0_START + off, count);
701 if (ret < 0)
702 return ret;
703
704 ret = ds2780_save_eeprom(dev_info, DS2780_EEPROM_BLOCK0_START);
705 if (ret < 0)
706 return ret;
707
708 return count;
709}
710
711static struct bin_attribute ds2780_user_eeprom_bin_attr = {
712 .attr = {
713 .name = "user_eeprom",
714 .mode = S_IRUGO | S_IWUSR,
715 },
753f1583 716 .size = DS2780_USER_EEPROM_SIZE,
275ac746
CB		 717 .read = ds2780_read_user_eeprom_bin,
718 .write = ds2780_write_user_eeprom_bin,
719};
720
721static DEVICE_ATTR(pmod_enabled, S_IRUGO | S_IWUSR, ds2780_get_pmod_enabled,
722 ds2780_set_pmod_enabled);
723static DEVICE_ATTR(sense_resistor_value, S_IRUGO | S_IWUSR,
724 ds2780_get_sense_resistor_value, ds2780_set_sense_resistor_value);
725static DEVICE_ATTR(rsgain_setting, S_IRUGO | S_IWUSR, ds2780_get_rsgain_setting,
726 ds2780_set_rsgain_setting);
727static DEVICE_ATTR(pio_pin, S_IRUGO | S_IWUSR, ds2780_get_pio_pin,
728 ds2780_set_pio_pin);
729
730
731static struct attribute *ds2780_attributes[] = {
732 &dev_attr_pmod_enabled.attr,
733 &dev_attr_sense_resistor_value.attr,
734 &dev_attr_rsgain_setting.attr,
735 &dev_attr_pio_pin.attr,
736 NULL
737};
738
739static const struct attribute_group ds2780_attr_group = {
740 .attrs = ds2780_attributes,
741};
742
c8afa640 743static int ds2780_battery_probe(struct platform_device *pdev)
275ac746 744{
297d716f 745 struct power_supply_config psy_cfg = {};
275ac746
CB		 746 int ret = 0;
747 struct ds2780_device_info *dev_info;
748
2cb12122 749 dev_info = devm_kzalloc(&pdev->dev, sizeof(*dev_info), GFP_KERNEL);
275ac746
CB		 750 if (!dev_info) {
751 ret = -ENOMEM;
752 goto fail;
753 }
754
755 platform_set_drvdata(pdev, dev_info);
756
757 dev_info->dev = &pdev->dev;
758 dev_info->w1_dev = pdev->dev.parent;
297d716f
KK		 759 dev_info->bat_desc.name = dev_name(&pdev->dev);
760 dev_info->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY;
761 dev_info->bat_desc.properties = ds2780_battery_props;
762 dev_info->bat_desc.num_properties = ARRAY_SIZE(ds2780_battery_props);
763 dev_info->bat_desc.get_property = ds2780_battery_get_property;
275ac746 764
297d716f
KK		 765 psy_cfg.drv_data = dev_info;
766
767 dev_info->bat = power_supply_register(&pdev->dev, &dev_info->bat_desc,
768 &psy_cfg);
769 if (IS_ERR(dev_info->bat)) {
275ac746 770 dev_err(dev_info->dev, "failed to register battery\n");
297d716f 771 ret = PTR_ERR(dev_info->bat);
2cb12122 772 goto fail;
275ac746
CB		 773 }
774
297d716f 775 ret = sysfs_create_group(&dev_info->bat->dev.kobj, &ds2780_attr_group);
275ac746
CB		 776 if (ret) {
777 dev_err(dev_info->dev, "failed to create sysfs group\n");
778 goto fail_unregister;
779 }
780
297d716f 781 ret = sysfs_create_bin_file(&dev_info->bat->dev.kobj,
275ac746
CB		 782 &ds2780_param_eeprom_bin_attr);
783 if (ret) {
784 dev_err(dev_info->dev,
785 "failed to create param eeprom bin file");
786 goto fail_remove_group;
787 }
788
297d716f 789 ret = sysfs_create_bin_file(&dev_info->bat->dev.kobj,
275ac746
CB		 790 &ds2780_user_eeprom_bin_attr);
791 if (ret) {
792 dev_err(dev_info->dev,
793 "failed to create user eeprom bin file");
794 goto fail_remove_bin_file;
795 }
796
797 return 0;
798
799fail_remove_bin_file:
297d716f 800 sysfs_remove_bin_file(&dev_info->bat->dev.kobj,
275ac746
CB		 801 &ds2780_param_eeprom_bin_attr);
802fail_remove_group:
297d716f 803 sysfs_remove_group(&dev_info->bat->dev.kobj, &ds2780_attr_group);
275ac746 804fail_unregister:
297d716f 805 power_supply_unregister(dev_info->bat);
275ac746
CB		 806fail:
807 return ret;
808}
809
415ec69f 810static int ds2780_battery_remove(struct platform_device *pdev)
275ac746
CB		 811{
812 struct ds2780_device_info *dev_info = platform_get_drvdata(pdev);
813
297d716f
KK		 814 /*
815 * Remove attributes before unregistering power supply
816 * because 'bat' will be freed on power_supply_unregister() call.
817 */
818 sysfs_remove_group(&dev_info->bat->dev.kobj, &ds2780_attr_group);
275ac746 819
297d716f 820 power_supply_unregister(dev_info->bat);
275ac746 821
275ac746
CB		 822 return 0;
823}
824
275ac746
CB		 825static struct platform_driver ds2780_battery_driver = {
826 .driver = {
827 .name = "ds2780-battery",
828 },
829 .probe = ds2780_battery_probe,
28ea73f4 830 .remove = ds2780_battery_remove,
275ac746
CB		 831};
832
300bac7f 833module_platform_driver(ds2780_battery_driver);
275ac746
CB		 834
835MODULE_LICENSE("GPL");
836MODULE_AUTHOR("Clifton Barnes <cabarnes@indesign-llc.com>");
837MODULE_DESCRIPTION("Maxim/Dallas DS2780 Stand-Alone Fuel Gauage IC driver");
300bac7f 838MODULE_ALIAS("platform:ds2780-battery");
Linux 6.x block layer and io_uring tree(s)