blob: 56d583dae9087c89742bf25e4d0a61364d4f5885 [file] [log] [blame]
Renata Sayakhovafef37e92012-02-29 14:58:53 +01001/*
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;
Krzysztof Kozlowski297d7162015-03-12 08:44:11 +010038 struct power_supply *bat;
39 struct power_supply_desc bat_desc;
Renata Sayakhovafef37e92012-02-29 14:58:53 +010040 struct device *w1_dev;
Renata Sayakhovafef37e92012-02-29 14:58:53 +010041};
42
43enum current_types {
44 CURRENT_NOW,
45 CURRENT_AVG,
46};
47
48static const char model[] = "DS2781";
49static const char manufacturer[] = "Maxim/Dallas";
50
51static inline struct ds2781_device_info *
52to_ds2781_device_info(struct power_supply *psy)
53{
Krzysztof Kozlowski297d7162015-03-12 08:44:11 +010054 return power_supply_get_drvdata(psy);
Renata Sayakhovafef37e92012-02-29 14:58:53 +010055}
56
57static inline struct power_supply *to_power_supply(struct device *dev)
58{
59 return dev_get_drvdata(dev);
60}
61
62static inline int ds2781_battery_io(struct ds2781_device_info *dev_info,
63 char *buf, int addr, size_t count, int io)
64{
NeilBrownb02f8be2012-05-18 15:59:52 +100065 return w1_ds2781_io(dev_info->w1_dev, buf, addr, count, io);
Renata Sayakhovafef37e92012-02-29 14:58:53 +010066}
67
Anton Vorontsov7dbae552012-06-17 21:20:05 -070068static int w1_ds2781_read(struct ds2781_device_info *dev_info, char *buf,
Renata Sayakhovafef37e92012-02-29 14:58:53 +010069 int addr, size_t count)
70{
71 return ds2781_battery_io(dev_info, buf, addr, count, 0);
72}
73
74static inline int ds2781_read8(struct ds2781_device_info *dev_info, u8 *val,
75 int addr)
76{
77 return ds2781_battery_io(dev_info, val, addr, sizeof(u8), 0);
78}
79
80static int ds2781_read16(struct ds2781_device_info *dev_info, s16 *val,
81 int addr)
82{
83 int ret;
84 u8 raw[2];
85
86 ret = ds2781_battery_io(dev_info, raw, addr, sizeof(raw), 0);
87 if (ret < 0)
88 return ret;
89
90 *val = (raw[0] << 8) | raw[1];
91
92 return 0;
93}
94
95static inline int ds2781_read_block(struct ds2781_device_info *dev_info,
96 u8 *val, int addr, size_t count)
97{
98 return ds2781_battery_io(dev_info, val, addr, count, 0);
99}
100
101static inline int ds2781_write(struct ds2781_device_info *dev_info, u8 *val,
102 int addr, size_t count)
103{
104 return ds2781_battery_io(dev_info, val, addr, count, 1);
105}
106
107static inline int ds2781_store_eeprom(struct device *dev, int addr)
108{
109 return w1_ds2781_eeprom_cmd(dev, addr, W1_DS2781_COPY_DATA);
110}
111
112static inline int ds2781_recall_eeprom(struct device *dev, int addr)
113{
114 return w1_ds2781_eeprom_cmd(dev, addr, W1_DS2781_RECALL_DATA);
115}
116
117static int ds2781_save_eeprom(struct ds2781_device_info *dev_info, int reg)
118{
119 int ret;
120
121 ret = ds2781_store_eeprom(dev_info->w1_dev, reg);
122 if (ret < 0)
123 return ret;
124
125 ret = ds2781_recall_eeprom(dev_info->w1_dev, reg);
126 if (ret < 0)
127 return ret;
128
129 return 0;
130}
131
132/* Set sense resistor value in mhos */
133static int ds2781_set_sense_register(struct ds2781_device_info *dev_info,
134 u8 conductance)
135{
136 int ret;
137
138 ret = ds2781_write(dev_info, &conductance,
139 DS2781_RSNSP, sizeof(u8));
140 if (ret < 0)
141 return ret;
142
143 return ds2781_save_eeprom(dev_info, DS2781_RSNSP);
144}
145
146/* Get RSGAIN value from 0 to 1.999 in steps of 0.001 */
147static int ds2781_get_rsgain_register(struct ds2781_device_info *dev_info,
148 u16 *rsgain)
149{
150 return ds2781_read16(dev_info, rsgain, DS2781_RSGAIN_MSB);
151}
152
153/* Set RSGAIN value from 0 to 1.999 in steps of 0.001 */
154static int ds2781_set_rsgain_register(struct ds2781_device_info *dev_info,
155 u16 rsgain)
156{
157 int ret;
158 u8 raw[] = {rsgain >> 8, rsgain & 0xFF};
159
160 ret = ds2781_write(dev_info, raw,
161 DS2781_RSGAIN_MSB, sizeof(raw));
162 if (ret < 0)
163 return ret;
164
165 return ds2781_save_eeprom(dev_info, DS2781_RSGAIN_MSB);
166}
167
168static int ds2781_get_voltage(struct ds2781_device_info *dev_info,
169 int *voltage_uV)
170{
171 int ret;
172 char val[2];
173 int voltage_raw;
174
175 ret = w1_ds2781_read(dev_info, val, DS2781_VOLT_MSB, 2 * sizeof(u8));
176 if (ret < 0)
177 return ret;
178 /*
179 * The voltage value is located in 10 bits across the voltage MSB
180 * and LSB registers in two's compliment form
181 * Sign bit of the voltage value is in bit 7 of the voltage MSB register
182 * Bits 9 - 3 of the voltage value are in bits 6 - 0 of the
183 * voltage MSB register
184 * Bits 2 - 0 of the voltage value are in bits 7 - 5 of the
185 * voltage LSB register
186 */
187 voltage_raw = (val[0] << 3) |
188 (val[1] >> 5);
189
190 /* DS2781 reports voltage in units of 9.76mV, but the battery class
191 * reports in units of uV, so convert by multiplying by 9760. */
192 *voltage_uV = voltage_raw * 9760;
193
194 return 0;
195}
196
197static int ds2781_get_temperature(struct ds2781_device_info *dev_info,
198 int *temp)
199{
200 int ret;
201 char val[2];
202 int temp_raw;
203
204 ret = w1_ds2781_read(dev_info, val, DS2781_TEMP_MSB, 2 * sizeof(u8));
205 if (ret < 0)
206 return ret;
207 /*
208 * The temperature value is located in 10 bits across the temperature
209 * MSB and LSB registers in two's compliment form
210 * Sign bit of the temperature value is in bit 7 of the temperature
211 * MSB register
212 * Bits 9 - 3 of the temperature value are in bits 6 - 0 of the
213 * temperature MSB register
214 * Bits 2 - 0 of the temperature value are in bits 7 - 5 of the
215 * temperature LSB register
216 */
217 temp_raw = ((val[0]) << 3) |
218 (val[1] >> 5);
219 *temp = temp_raw + (temp_raw / 4);
220
221 return 0;
222}
223
224static int ds2781_get_current(struct ds2781_device_info *dev_info,
225 enum current_types type, int *current_uA)
226{
227 int ret, sense_res;
228 s16 current_raw;
229 u8 sense_res_raw, reg_msb;
230
231 /*
232 * The units of measurement for current are dependent on the value of
233 * the sense resistor.
234 */
235 ret = ds2781_read8(dev_info, &sense_res_raw, DS2781_RSNSP);
236 if (ret < 0)
237 return ret;
238
239 if (sense_res_raw == 0) {
240 dev_err(dev_info->dev, "sense resistor value is 0\n");
241 return -EINVAL;
242 }
243 sense_res = 1000 / sense_res_raw;
244
245 if (type == CURRENT_NOW)
246 reg_msb = DS2781_CURRENT_MSB;
247 else if (type == CURRENT_AVG)
248 reg_msb = DS2781_IAVG_MSB;
249 else
250 return -EINVAL;
251
252 /*
253 * The current value is located in 16 bits across the current MSB
254 * and LSB registers in two's compliment form
255 * Sign bit of the current value is in bit 7 of the current MSB register
256 * Bits 14 - 8 of the current value are in bits 6 - 0 of the current
257 * MSB register
258 * Bits 7 - 0 of the current value are in bits 7 - 0 of the current
259 * LSB register
260 */
261 ret = ds2781_read16(dev_info, &current_raw, reg_msb);
262 if (ret < 0)
263 return ret;
264
265 *current_uA = current_raw * (DS2781_CURRENT_UNITS / sense_res);
266 return 0;
267}
268
269static int ds2781_get_accumulated_current(struct ds2781_device_info *dev_info,
270 int *accumulated_current)
271{
272 int ret, sense_res;
273 s16 current_raw;
274 u8 sense_res_raw;
275
276 /*
277 * The units of measurement for accumulated current are dependent on
278 * the value of the sense resistor.
279 */
280 ret = ds2781_read8(dev_info, &sense_res_raw, DS2781_RSNSP);
281 if (ret < 0)
282 return ret;
283
284 if (sense_res_raw == 0) {
285 dev_err(dev_info->dev, "sense resistor value is 0\n");
286 return -EINVAL;
287 }
288 sense_res = 1000 / sense_res_raw;
289
290 /*
291 * The ACR value is located in 16 bits across the ACR MSB and
292 * LSB registers
293 * Bits 15 - 8 of the ACR value are in bits 7 - 0 of the ACR
294 * MSB register
295 * Bits 7 - 0 of the ACR value are in bits 7 - 0 of the ACR
296 * LSB register
297 */
298 ret = ds2781_read16(dev_info, &current_raw, DS2781_ACR_MSB);
299 if (ret < 0)
300 return ret;
301
302 *accumulated_current = current_raw * (DS2781_CHARGE_UNITS / sense_res);
303 return 0;
304}
305
306static int ds2781_get_capacity(struct ds2781_device_info *dev_info,
307 int *capacity)
308{
309 int ret;
310 u8 raw;
311
312 ret = ds2781_read8(dev_info, &raw, DS2781_RARC);
313 if (ret < 0)
314 return ret;
315
316 *capacity = raw;
317 return 0;
318}
319
320static int ds2781_get_status(struct ds2781_device_info *dev_info, int *status)
321{
322 int ret, current_uA, capacity;
323
324 ret = ds2781_get_current(dev_info, CURRENT_NOW, &current_uA);
325 if (ret < 0)
326 return ret;
327
328 ret = ds2781_get_capacity(dev_info, &capacity);
329 if (ret < 0)
330 return ret;
331
Krzysztof Kozlowski297d7162015-03-12 08:44:11 +0100332 if (power_supply_am_i_supplied(dev_info->bat)) {
Renata Sayakhovafef37e92012-02-29 14:58:53 +0100333 if (capacity == 100)
334 *status = POWER_SUPPLY_STATUS_FULL;
335 else if (current_uA > 50000)
336 *status = POWER_SUPPLY_STATUS_CHARGING;
337 else
338 *status = POWER_SUPPLY_STATUS_NOT_CHARGING;
339 } else {
340 *status = POWER_SUPPLY_STATUS_DISCHARGING;
341 }
342 return 0;
343}
344
345static int ds2781_get_charge_now(struct ds2781_device_info *dev_info,
346 int *charge_now)
347{
348 int ret;
349 u16 charge_raw;
350
351 /*
352 * The RAAC value is located in 16 bits across the RAAC MSB and
353 * LSB registers
354 * Bits 15 - 8 of the RAAC value are in bits 7 - 0 of the RAAC
355 * MSB register
356 * Bits 7 - 0 of the RAAC value are in bits 7 - 0 of the RAAC
357 * LSB register
358 */
359 ret = ds2781_read16(dev_info, &charge_raw, DS2781_RAAC_MSB);
360 if (ret < 0)
361 return ret;
362
363 *charge_now = charge_raw * 1600;
364 return 0;
365}
366
367static int ds2781_get_control_register(struct ds2781_device_info *dev_info,
368 u8 *control_reg)
369{
370 return ds2781_read8(dev_info, control_reg, DS2781_CONTROL);
371}
372
373static int ds2781_set_control_register(struct ds2781_device_info *dev_info,
374 u8 control_reg)
375{
376 int ret;
377
378 ret = ds2781_write(dev_info, &control_reg,
379 DS2781_CONTROL, sizeof(u8));
380 if (ret < 0)
381 return ret;
382
383 return ds2781_save_eeprom(dev_info, DS2781_CONTROL);
384}
385
386static int ds2781_battery_get_property(struct power_supply *psy,
387 enum power_supply_property psp,
388 union power_supply_propval *val)
389{
390 int ret = 0;
391 struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
392
393 switch (psp) {
394 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
395 ret = ds2781_get_voltage(dev_info, &val->intval);
396 break;
397
398 case POWER_SUPPLY_PROP_TEMP:
399 ret = ds2781_get_temperature(dev_info, &val->intval);
400 break;
401
402 case POWER_SUPPLY_PROP_MODEL_NAME:
403 val->strval = model;
404 break;
405
406 case POWER_SUPPLY_PROP_MANUFACTURER:
407 val->strval = manufacturer;
408 break;
409
410 case POWER_SUPPLY_PROP_CURRENT_NOW:
411 ret = ds2781_get_current(dev_info, CURRENT_NOW, &val->intval);
412 break;
413
414 case POWER_SUPPLY_PROP_CURRENT_AVG:
415 ret = ds2781_get_current(dev_info, CURRENT_AVG, &val->intval);
416 break;
417
418 case POWER_SUPPLY_PROP_STATUS:
419 ret = ds2781_get_status(dev_info, &val->intval);
420 break;
421
422 case POWER_SUPPLY_PROP_CAPACITY:
423 ret = ds2781_get_capacity(dev_info, &val->intval);
424 break;
425
426 case POWER_SUPPLY_PROP_CHARGE_COUNTER:
427 ret = ds2781_get_accumulated_current(dev_info, &val->intval);
428 break;
429
430 case POWER_SUPPLY_PROP_CHARGE_NOW:
431 ret = ds2781_get_charge_now(dev_info, &val->intval);
432 break;
433
434 default:
435 ret = -EINVAL;
436 }
437
438 return ret;
439}
440
441static enum power_supply_property ds2781_battery_props[] = {
442 POWER_SUPPLY_PROP_STATUS,
443 POWER_SUPPLY_PROP_VOLTAGE_NOW,
444 POWER_SUPPLY_PROP_TEMP,
445 POWER_SUPPLY_PROP_MODEL_NAME,
446 POWER_SUPPLY_PROP_MANUFACTURER,
447 POWER_SUPPLY_PROP_CURRENT_NOW,
448 POWER_SUPPLY_PROP_CURRENT_AVG,
449 POWER_SUPPLY_PROP_CAPACITY,
450 POWER_SUPPLY_PROP_CHARGE_COUNTER,
451 POWER_SUPPLY_PROP_CHARGE_NOW,
452};
453
454static ssize_t ds2781_get_pmod_enabled(struct device *dev,
455 struct device_attribute *attr,
456 char *buf)
457{
458 int ret;
459 u8 control_reg;
460 struct power_supply *psy = to_power_supply(dev);
461 struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
462
463 /* Get power mode */
464 ret = ds2781_get_control_register(dev_info, &control_reg);
465 if (ret < 0)
466 return ret;
467
468 return sprintf(buf, "%d\n",
469 !!(control_reg & DS2781_CONTROL_PMOD));
470}
471
472static ssize_t ds2781_set_pmod_enabled(struct device *dev,
473 struct device_attribute *attr,
474 const char *buf,
475 size_t count)
476{
477 int ret;
478 u8 control_reg, new_setting;
479 struct power_supply *psy = to_power_supply(dev);
480 struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
481
482 /* Set power mode */
483 ret = ds2781_get_control_register(dev_info, &control_reg);
484 if (ret < 0)
485 return ret;
486
487 ret = kstrtou8(buf, 0, &new_setting);
488 if (ret < 0)
489 return ret;
490
491 if ((new_setting != 0) && (new_setting != 1)) {
492 dev_err(dev_info->dev, "Invalid pmod setting (0 or 1)\n");
493 return -EINVAL;
494 }
495
496 if (new_setting)
497 control_reg |= DS2781_CONTROL_PMOD;
498 else
499 control_reg &= ~DS2781_CONTROL_PMOD;
500
501 ret = ds2781_set_control_register(dev_info, control_reg);
502 if (ret < 0)
503 return ret;
504
505 return count;
506}
507
508static ssize_t ds2781_get_sense_resistor_value(struct device *dev,
509 struct device_attribute *attr,
510 char *buf)
511{
512 int ret;
513 u8 sense_resistor;
514 struct power_supply *psy = to_power_supply(dev);
515 struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
516
517 ret = ds2781_read8(dev_info, &sense_resistor, DS2781_RSNSP);
518 if (ret < 0)
519 return ret;
520
521 ret = sprintf(buf, "%d\n", sense_resistor);
522 return ret;
523}
524
525static ssize_t ds2781_set_sense_resistor_value(struct device *dev,
526 struct device_attribute *attr,
527 const char *buf,
528 size_t count)
529{
530 int ret;
531 u8 new_setting;
532 struct power_supply *psy = to_power_supply(dev);
533 struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
534
535 ret = kstrtou8(buf, 0, &new_setting);
536 if (ret < 0)
537 return ret;
538
539 ret = ds2781_set_sense_register(dev_info, new_setting);
540 if (ret < 0)
541 return ret;
542
543 return count;
544}
545
546static ssize_t ds2781_get_rsgain_setting(struct device *dev,
547 struct device_attribute *attr,
548 char *buf)
549{
550 int ret;
551 u16 rsgain;
552 struct power_supply *psy = to_power_supply(dev);
553 struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
554
555 ret = ds2781_get_rsgain_register(dev_info, &rsgain);
556 if (ret < 0)
557 return ret;
558
559 return sprintf(buf, "%d\n", rsgain);
560}
561
562static ssize_t ds2781_set_rsgain_setting(struct device *dev,
563 struct device_attribute *attr,
564 const char *buf,
565 size_t count)
566{
567 int ret;
568 u16 new_setting;
569 struct power_supply *psy = to_power_supply(dev);
570 struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
571
572 ret = kstrtou16(buf, 0, &new_setting);
573 if (ret < 0)
574 return ret;
575
576 /* Gain can only be from 0 to 1.999 in steps of .001 */
577 if (new_setting > 1999) {
578 dev_err(dev_info->dev, "Invalid rsgain setting (0 - 1999)\n");
579 return -EINVAL;
580 }
581
582 ret = ds2781_set_rsgain_register(dev_info, new_setting);
583 if (ret < 0)
584 return ret;
585
586 return count;
587}
588
589static ssize_t ds2781_get_pio_pin(struct device *dev,
590 struct device_attribute *attr,
591 char *buf)
592{
593 int ret;
594 u8 sfr;
595 struct power_supply *psy = to_power_supply(dev);
596 struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
597
598 ret = ds2781_read8(dev_info, &sfr, DS2781_SFR);
599 if (ret < 0)
600 return ret;
601
602 ret = sprintf(buf, "%d\n", sfr & DS2781_SFR_PIOSC);
603 return ret;
604}
605
606static ssize_t ds2781_set_pio_pin(struct device *dev,
607 struct device_attribute *attr,
608 const char *buf,
609 size_t count)
610{
611 int ret;
612 u8 new_setting;
613 struct power_supply *psy = to_power_supply(dev);
614 struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
615
616 ret = kstrtou8(buf, 0, &new_setting);
617 if (ret < 0)
618 return ret;
619
620 if ((new_setting != 0) && (new_setting != 1)) {
621 dev_err(dev_info->dev, "Invalid pio_pin setting (0 or 1)\n");
622 return -EINVAL;
623 }
624
625 ret = ds2781_write(dev_info, &new_setting,
626 DS2781_SFR, sizeof(u8));
627 if (ret < 0)
628 return ret;
629
630 return count;
631}
632
633static ssize_t ds2781_read_param_eeprom_bin(struct file *filp,
634 struct kobject *kobj,
635 struct bin_attribute *bin_attr,
636 char *buf, loff_t off, size_t count)
637{
638 struct device *dev = container_of(kobj, struct device, kobj);
639 struct power_supply *psy = to_power_supply(dev);
640 struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
641
Axel Lin13f24832012-03-17 15:37:31 +0800642 count = min_t(loff_t, count, DS2781_PARAM_EEPROM_SIZE - off);
Renata Sayakhovafef37e92012-02-29 14:58:53 +0100643
644 return ds2781_read_block(dev_info, buf,
645 DS2781_EEPROM_BLOCK1_START + off, count);
646}
647
648static ssize_t ds2781_write_param_eeprom_bin(struct file *filp,
649 struct kobject *kobj,
650 struct bin_attribute *bin_attr,
651 char *buf, loff_t off, size_t count)
652{
653 struct device *dev = container_of(kobj, struct device, kobj);
654 struct power_supply *psy = to_power_supply(dev);
655 struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
656 int ret;
657
Axel Lin13f24832012-03-17 15:37:31 +0800658 count = min_t(loff_t, count, DS2781_PARAM_EEPROM_SIZE - off);
Renata Sayakhovafef37e92012-02-29 14:58:53 +0100659
660 ret = ds2781_write(dev_info, buf,
661 DS2781_EEPROM_BLOCK1_START + off, count);
662 if (ret < 0)
663 return ret;
664
665 ret = ds2781_save_eeprom(dev_info, DS2781_EEPROM_BLOCK1_START);
666 if (ret < 0)
667 return ret;
668
669 return count;
670}
671
672static struct bin_attribute ds2781_param_eeprom_bin_attr = {
673 .attr = {
674 .name = "param_eeprom",
675 .mode = S_IRUGO | S_IWUSR,
676 },
Axel Lin13f24832012-03-17 15:37:31 +0800677 .size = DS2781_PARAM_EEPROM_SIZE,
Renata Sayakhovafef37e92012-02-29 14:58:53 +0100678 .read = ds2781_read_param_eeprom_bin,
679 .write = ds2781_write_param_eeprom_bin,
680};
681
682static ssize_t ds2781_read_user_eeprom_bin(struct file *filp,
683 struct kobject *kobj,
684 struct bin_attribute *bin_attr,
685 char *buf, loff_t off, size_t count)
686{
687 struct device *dev = container_of(kobj, struct device, kobj);
688 struct power_supply *psy = to_power_supply(dev);
689 struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
690
Axel Lin13f24832012-03-17 15:37:31 +0800691 count = min_t(loff_t, count, DS2781_USER_EEPROM_SIZE - off);
Renata Sayakhovafef37e92012-02-29 14:58:53 +0100692
693 return ds2781_read_block(dev_info, buf,
694 DS2781_EEPROM_BLOCK0_START + off, count);
695
696}
697
698static ssize_t ds2781_write_user_eeprom_bin(struct file *filp,
699 struct kobject *kobj,
700 struct bin_attribute *bin_attr,
701 char *buf, loff_t off, size_t count)
702{
703 struct device *dev = container_of(kobj, struct device, kobj);
704 struct power_supply *psy = to_power_supply(dev);
705 struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);
706 int ret;
707
Axel Lin13f24832012-03-17 15:37:31 +0800708 count = min_t(loff_t, count, DS2781_USER_EEPROM_SIZE - off);
Renata Sayakhovafef37e92012-02-29 14:58:53 +0100709
710 ret = ds2781_write(dev_info, buf,
711 DS2781_EEPROM_BLOCK0_START + off, count);
712 if (ret < 0)
713 return ret;
714
715 ret = ds2781_save_eeprom(dev_info, DS2781_EEPROM_BLOCK0_START);
716 if (ret < 0)
717 return ret;
718
719 return count;
720}
721
722static struct bin_attribute ds2781_user_eeprom_bin_attr = {
723 .attr = {
724 .name = "user_eeprom",
725 .mode = S_IRUGO | S_IWUSR,
726 },
Axel Lin13f24832012-03-17 15:37:31 +0800727 .size = DS2781_USER_EEPROM_SIZE,
Renata Sayakhovafef37e92012-02-29 14:58:53 +0100728 .read = ds2781_read_user_eeprom_bin,
729 .write = ds2781_write_user_eeprom_bin,
730};
731
732static DEVICE_ATTR(pmod_enabled, S_IRUGO | S_IWUSR, ds2781_get_pmod_enabled,
733 ds2781_set_pmod_enabled);
734static DEVICE_ATTR(sense_resistor_value, S_IRUGO | S_IWUSR,
735 ds2781_get_sense_resistor_value, ds2781_set_sense_resistor_value);
736static DEVICE_ATTR(rsgain_setting, S_IRUGO | S_IWUSR, ds2781_get_rsgain_setting,
737 ds2781_set_rsgain_setting);
738static DEVICE_ATTR(pio_pin, S_IRUGO | S_IWUSR, ds2781_get_pio_pin,
739 ds2781_set_pio_pin);
740
741
742static struct attribute *ds2781_attributes[] = {
743 &dev_attr_pmod_enabled.attr,
744 &dev_attr_sense_resistor_value.attr,
745 &dev_attr_rsgain_setting.attr,
746 &dev_attr_pio_pin.attr,
747 NULL
748};
749
750static const struct attribute_group ds2781_attr_group = {
751 .attrs = ds2781_attributes,
752};
753
Bill Pembertonc8afa642012-11-19 13:22:23 -0500754static int ds2781_battery_probe(struct platform_device *pdev)
Renata Sayakhovafef37e92012-02-29 14:58:53 +0100755{
Krzysztof Kozlowski297d7162015-03-12 08:44:11 +0100756 struct power_supply_config psy_cfg = {};
Renata Sayakhovafef37e92012-02-29 14:58:53 +0100757 int ret = 0;
758 struct ds2781_device_info *dev_info;
759
Devendra Nagadeacc4f2012-07-30 16:29:33 +0545760 dev_info = devm_kzalloc(&pdev->dev, sizeof(*dev_info), GFP_KERNEL);
761 if (!dev_info)
762 return -ENOMEM;
Renata Sayakhovafef37e92012-02-29 14:58:53 +0100763
764 platform_set_drvdata(pdev, dev_info);
765
766 dev_info->dev = &pdev->dev;
767 dev_info->w1_dev = pdev->dev.parent;
Krzysztof Kozlowski297d7162015-03-12 08:44:11 +0100768 dev_info->bat_desc.name = dev_name(&pdev->dev);
769 dev_info->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY;
770 dev_info->bat_desc.properties = ds2781_battery_props;
771 dev_info->bat_desc.num_properties = ARRAY_SIZE(ds2781_battery_props);
772 dev_info->bat_desc.get_property = ds2781_battery_get_property;
Renata Sayakhovafef37e92012-02-29 14:58:53 +0100773
Krzysztof Kozlowski297d7162015-03-12 08:44:11 +0100774 psy_cfg.drv_data = dev_info;
775
776 dev_info->bat = power_supply_register(&pdev->dev, &dev_info->bat_desc,
777 &psy_cfg);
778 if (IS_ERR(dev_info->bat)) {
Renata Sayakhovafef37e92012-02-29 14:58:53 +0100779 dev_err(dev_info->dev, "failed to register battery\n");
Krzysztof Kozlowski297d7162015-03-12 08:44:11 +0100780 ret = PTR_ERR(dev_info->bat);
Devendra Nagadeacc4f2012-07-30 16:29:33 +0545781 goto fail;
Renata Sayakhovafef37e92012-02-29 14:58:53 +0100782 }
783
Krzysztof Kozlowski297d7162015-03-12 08:44:11 +0100784 ret = sysfs_create_group(&dev_info->bat->dev.kobj, &ds2781_attr_group);
Renata Sayakhovafef37e92012-02-29 14:58:53 +0100785 if (ret) {
786 dev_err(dev_info->dev, "failed to create sysfs group\n");
787 goto fail_unregister;
788 }
789
Krzysztof Kozlowski297d7162015-03-12 08:44:11 +0100790 ret = sysfs_create_bin_file(&dev_info->bat->dev.kobj,
Renata Sayakhovafef37e92012-02-29 14:58:53 +0100791 &ds2781_param_eeprom_bin_attr);
792 if (ret) {
793 dev_err(dev_info->dev,
794 "failed to create param eeprom bin file");
795 goto fail_remove_group;
796 }
797
Krzysztof Kozlowski297d7162015-03-12 08:44:11 +0100798 ret = sysfs_create_bin_file(&dev_info->bat->dev.kobj,
Renata Sayakhovafef37e92012-02-29 14:58:53 +0100799 &ds2781_user_eeprom_bin_attr);
800 if (ret) {
801 dev_err(dev_info->dev,
802 "failed to create user eeprom bin file");
803 goto fail_remove_bin_file;
804 }
805
Renata Sayakhovafef37e92012-02-29 14:58:53 +0100806 return 0;
807
808fail_remove_bin_file:
Krzysztof Kozlowski297d7162015-03-12 08:44:11 +0100809 sysfs_remove_bin_file(&dev_info->bat->dev.kobj,
Renata Sayakhovafef37e92012-02-29 14:58:53 +0100810 &ds2781_param_eeprom_bin_attr);
811fail_remove_group:
Krzysztof Kozlowski297d7162015-03-12 08:44:11 +0100812 sysfs_remove_group(&dev_info->bat->dev.kobj, &ds2781_attr_group);
Renata Sayakhovafef37e92012-02-29 14:58:53 +0100813fail_unregister:
Krzysztof Kozlowski297d7162015-03-12 08:44:11 +0100814 power_supply_unregister(dev_info->bat);
Renata Sayakhovafef37e92012-02-29 14:58:53 +0100815fail:
816 return ret;
817}
818
Bill Pemberton415ec692012-11-19 13:26:07 -0500819static int ds2781_battery_remove(struct platform_device *pdev)
Renata Sayakhovafef37e92012-02-29 14:58:53 +0100820{
821 struct ds2781_device_info *dev_info = platform_get_drvdata(pdev);
822
Krzysztof Kozlowski297d7162015-03-12 08:44:11 +0100823 /*
824 * Remove attributes before unregistering power supply
825 * because 'bat' will be freed on power_supply_unregister() call.
826 */
827 sysfs_remove_group(&dev_info->bat->dev.kobj, &ds2781_attr_group);
Renata Sayakhovafef37e92012-02-29 14:58:53 +0100828
Krzysztof Kozlowski297d7162015-03-12 08:44:11 +0100829 power_supply_unregister(dev_info->bat);
Renata Sayakhovafef37e92012-02-29 14:58:53 +0100830
Renata Sayakhovafef37e92012-02-29 14:58:53 +0100831 return 0;
832}
833
834static struct platform_driver ds2781_battery_driver = {
835 .driver = {
836 .name = "ds2781-battery",
837 },
838 .probe = ds2781_battery_probe,
Bill Pemberton28ea73f2012-11-19 13:20:40 -0500839 .remove = ds2781_battery_remove,
Renata Sayakhovafef37e92012-02-29 14:58:53 +0100840};
Devendra Nagabc6e51d2012-07-30 16:29:10 +0545841module_platform_driver(ds2781_battery_driver);
Renata Sayakhovafef37e92012-02-29 14:58:53 +0100842
843MODULE_LICENSE("GPL");
844MODULE_AUTHOR("Renata Sayakhova <renata@oktetlabs.ru>");
845MODULE_DESCRIPTION("Maxim/Dallas DS2781 Stand-Alone Fuel Gauage IC driver");
846MODULE_ALIAS("platform:ds2781-battery");
847