blob: 74fad941c56c226c2d20ae667c37bd36191d65a7 [file] [log] [blame]
Clifton Barnes275ac742011-05-26 16:26:04 -07001/*
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;
40 struct power_supply bat;
41 struct device *w1_dev;
42};
43
44enum current_types {
45 CURRENT_NOW,
46 CURRENT_AVG,
47};
48
49static const char model[] = "DS2780";
50static const char manufacturer[] = "Maxim/Dallas";
51
Clifton Barnes853eee72011-11-02 13:39:50 -070052static inline struct ds2780_device_info *
53to_ds2780_device_info(struct power_supply *psy)
Clifton Barnes275ac742011-05-26 16:26:04 -070054{
55 return container_of(psy, struct ds2780_device_info, bat);
56}
57
58static inline struct power_supply *to_power_supply(struct device *dev)
59{
60 return dev_get_drvdata(dev);
61}
62
Clifton Barnes853eee72011-11-02 13:39:50 -070063static inline int ds2780_battery_io(struct ds2780_device_info *dev_info,
64 char *buf, int addr, size_t count, int io)
Clifton Barnes275ac742011-05-26 16:26:04 -070065{
NeilBrownb02f8be2012-05-18 15:59:52 +100066 return w1_ds2780_io(dev_info->w1_dev, buf, addr, count, io);
Clifton Barnes275ac742011-05-26 16:26:04 -070067}
68
Clifton Barnes853eee72011-11-02 13:39:50 -070069static inline int ds2780_read8(struct ds2780_device_info *dev_info, u8 *val,
70 int addr)
71{
72 return ds2780_battery_io(dev_info, val, addr, sizeof(u8), 0);
73}
74
75static int ds2780_read16(struct ds2780_device_info *dev_info, s16 *val,
76 int addr)
Clifton Barnes275ac742011-05-26 16:26:04 -070077{
78 int ret;
79 u8 raw[2];
80
Clifton Barnes853eee72011-11-02 13:39:50 -070081 ret = ds2780_battery_io(dev_info, raw, addr, sizeof(raw), 0);
Clifton Barnes275ac742011-05-26 16:26:04 -070082 if (ret < 0)
83 return ret;
84
85 *val = (raw[0] << 8) | raw[1];
86
87 return 0;
88}
89
Clifton Barnes853eee72011-11-02 13:39:50 -070090static inline int ds2780_read_block(struct ds2780_device_info *dev_info,
91 u8 *val, int addr, size_t count)
Clifton Barnes275ac742011-05-26 16:26:04 -070092{
Clifton Barnes853eee72011-11-02 13:39:50 -070093 return ds2780_battery_io(dev_info, val, addr, count, 0);
Clifton Barnes275ac742011-05-26 16:26:04 -070094}
95
Clifton Barnes853eee72011-11-02 13:39:50 -070096static inline int ds2780_write(struct ds2780_device_info *dev_info, u8 *val,
97 int addr, size_t count)
Clifton Barnes275ac742011-05-26 16:26:04 -070098{
Clifton Barnes853eee72011-11-02 13:39:50 -070099 return ds2780_battery_io(dev_info, val, addr, count, 1);
Clifton Barnes275ac742011-05-26 16:26:04 -0700100}
101
102static inline int ds2780_store_eeprom(struct device *dev, int addr)
103{
104 return w1_ds2780_eeprom_cmd(dev, addr, W1_DS2780_COPY_DATA);
105}
106
107static inline int ds2780_recall_eeprom(struct device *dev, int addr)
108{
109 return w1_ds2780_eeprom_cmd(dev, addr, W1_DS2780_RECALL_DATA);
110}
111
112static int ds2780_save_eeprom(struct ds2780_device_info *dev_info, int reg)
113{
114 int ret;
115
116 ret = ds2780_store_eeprom(dev_info->w1_dev, reg);
117 if (ret < 0)
118 return ret;
119
120 ret = ds2780_recall_eeprom(dev_info->w1_dev, reg);
121 if (ret < 0)
122 return ret;
123
124 return 0;
125}
126
127/* Set sense resistor value in mhos */
128static int ds2780_set_sense_register(struct ds2780_device_info *dev_info,
129 u8 conductance)
130{
131 int ret;
132
Clifton Barnes853eee72011-11-02 13:39:50 -0700133 ret = ds2780_write(dev_info, &conductance,
Clifton Barnes275ac742011-05-26 16:26:04 -0700134 DS2780_RSNSP_REG, sizeof(u8));
135 if (ret < 0)
136 return ret;
137
138 return ds2780_save_eeprom(dev_info, DS2780_RSNSP_REG);
139}
140
141/* Get RSGAIN value from 0 to 1.999 in steps of 0.001 */
142static int ds2780_get_rsgain_register(struct ds2780_device_info *dev_info,
143 u16 *rsgain)
144{
Clifton Barnes853eee72011-11-02 13:39:50 -0700145 return ds2780_read16(dev_info, rsgain, DS2780_RSGAIN_MSB_REG);
Clifton Barnes275ac742011-05-26 16:26:04 -0700146}
147
148/* Set RSGAIN value from 0 to 1.999 in steps of 0.001 */
149static int ds2780_set_rsgain_register(struct ds2780_device_info *dev_info,
150 u16 rsgain)
151{
152 int ret;
153 u8 raw[] = {rsgain >> 8, rsgain & 0xFF};
154
Clifton Barnes853eee72011-11-02 13:39:50 -0700155 ret = ds2780_write(dev_info, raw,
156 DS2780_RSGAIN_MSB_REG, sizeof(raw));
Clifton Barnes275ac742011-05-26 16:26:04 -0700157 if (ret < 0)
158 return ret;
159
160 return ds2780_save_eeprom(dev_info, DS2780_RSGAIN_MSB_REG);
161}
162
163static int ds2780_get_voltage(struct ds2780_device_info *dev_info,
164 int *voltage_uV)
165{
166 int ret;
167 s16 voltage_raw;
168
169 /*
170 * The voltage value is located in 10 bits across the voltage MSB
171 * and LSB registers in two's compliment form
172 * Sign bit of the voltage value is in bit 7 of the voltage MSB register
173 * Bits 9 - 3 of the voltage value are in bits 6 - 0 of the
174 * voltage MSB register
175 * Bits 2 - 0 of the voltage value are in bits 7 - 5 of the
176 * voltage LSB register
177 */
Clifton Barnes853eee72011-11-02 13:39:50 -0700178 ret = ds2780_read16(dev_info, &voltage_raw,
Clifton Barnes275ac742011-05-26 16:26:04 -0700179 DS2780_VOLT_MSB_REG);
180 if (ret < 0)
181 return ret;
182
183 /*
184 * DS2780 reports voltage in units of 4.88mV, but the battery class
185 * reports in units of uV, so convert by multiplying by 4880.
186 */
187 *voltage_uV = (voltage_raw / 32) * 4880;
188 return 0;
189}
190
191static int ds2780_get_temperature(struct ds2780_device_info *dev_info,
192 int *temperature)
193{
194 int ret;
195 s16 temperature_raw;
196
197 /*
198 * The temperature value is located in 10 bits across the temperature
199 * MSB and LSB registers in two's compliment form
200 * Sign bit of the temperature value is in bit 7 of the temperature
201 * MSB register
202 * Bits 9 - 3 of the temperature value are in bits 6 - 0 of the
203 * temperature MSB register
204 * Bits 2 - 0 of the temperature value are in bits 7 - 5 of the
205 * temperature LSB register
206 */
Clifton Barnes853eee72011-11-02 13:39:50 -0700207 ret = ds2780_read16(dev_info, &temperature_raw,
Clifton Barnes275ac742011-05-26 16:26:04 -0700208 DS2780_TEMP_MSB_REG);
209 if (ret < 0)
210 return ret;
211
212 /*
213 * Temperature is measured in units of 0.125 degrees celcius, the
214 * power_supply class measures temperature in tenths of degrees
215 * celsius. The temperature value is stored as a 10 bit number, plus
216 * sign in the upper bits of a 16 bit register.
217 */
218 *temperature = ((temperature_raw / 32) * 125) / 100;
219 return 0;
220}
221
222static int ds2780_get_current(struct ds2780_device_info *dev_info,
223 enum current_types type, int *current_uA)
224{
225 int ret, sense_res;
226 s16 current_raw;
227 u8 sense_res_raw, reg_msb;
228
229 /*
230 * The units of measurement for current are dependent on the value of
231 * the sense resistor.
232 */
Clifton Barnes853eee72011-11-02 13:39:50 -0700233 ret = ds2780_read8(dev_info, &sense_res_raw, DS2780_RSNSP_REG);
Clifton Barnes275ac742011-05-26 16:26:04 -0700234 if (ret < 0)
235 return ret;
236
237 if (sense_res_raw == 0) {
238 dev_err(dev_info->dev, "sense resistor value is 0\n");
Clifton Barnes853eee72011-11-02 13:39:50 -0700239 return -EINVAL;
Clifton Barnes275ac742011-05-26 16:26:04 -0700240 }
241 sense_res = 1000 / sense_res_raw;
242
243 if (type == CURRENT_NOW)
244 reg_msb = DS2780_CURRENT_MSB_REG;
245 else if (type == CURRENT_AVG)
246 reg_msb = DS2780_IAVG_MSB_REG;
247 else
248 return -EINVAL;
249
250 /*
251 * The current value is located in 16 bits across the current MSB
252 * and LSB registers in two's compliment form
253 * Sign bit of the current value is in bit 7 of the current MSB register
254 * Bits 14 - 8 of the current value are in bits 6 - 0 of the current
255 * MSB register
256 * Bits 7 - 0 of the current value are in bits 7 - 0 of the current
257 * LSB register
258 */
Clifton Barnes853eee72011-11-02 13:39:50 -0700259 ret = ds2780_read16(dev_info, &current_raw, reg_msb);
Clifton Barnes275ac742011-05-26 16:26:04 -0700260 if (ret < 0)
261 return ret;
262
263 *current_uA = current_raw * (DS2780_CURRENT_UNITS / sense_res);
264 return 0;
265}
266
267static int ds2780_get_accumulated_current(struct ds2780_device_info *dev_info,
268 int *accumulated_current)
269{
270 int ret, sense_res;
271 s16 current_raw;
272 u8 sense_res_raw;
273
274 /*
275 * The units of measurement for accumulated current are dependent on
276 * the value of the sense resistor.
277 */
Clifton Barnes853eee72011-11-02 13:39:50 -0700278 ret = ds2780_read8(dev_info, &sense_res_raw, DS2780_RSNSP_REG);
Clifton Barnes275ac742011-05-26 16:26:04 -0700279 if (ret < 0)
280 return ret;
281
282 if (sense_res_raw == 0) {
283 dev_err(dev_info->dev, "sense resistor value is 0\n");
284 return -ENXIO;
285 }
286 sense_res = 1000 / sense_res_raw;
287
288 /*
289 * The ACR value is located in 16 bits across the ACR MSB and
290 * LSB registers
291 * Bits 15 - 8 of the ACR value are in bits 7 - 0 of the ACR
292 * MSB register
293 * Bits 7 - 0 of the ACR value are in bits 7 - 0 of the ACR
294 * LSB register
295 */
Clifton Barnes853eee72011-11-02 13:39:50 -0700296 ret = ds2780_read16(dev_info, &current_raw, DS2780_ACR_MSB_REG);
Clifton Barnes275ac742011-05-26 16:26:04 -0700297 if (ret < 0)
298 return ret;
299
300 *accumulated_current = current_raw * (DS2780_CHARGE_UNITS / sense_res);
301 return 0;
302}
303
304static int ds2780_get_capacity(struct ds2780_device_info *dev_info,
305 int *capacity)
306{
307 int ret;
308 u8 raw;
309
Clifton Barnes853eee72011-11-02 13:39:50 -0700310 ret = ds2780_read8(dev_info, &raw, DS2780_RARC_REG);
Clifton Barnes275ac742011-05-26 16:26:04 -0700311 if (ret < 0)
312 return ret;
313
314 *capacity = raw;
315 return raw;
316}
317
318static int ds2780_get_status(struct ds2780_device_info *dev_info, int *status)
319{
320 int ret, current_uA, capacity;
321
322 ret = ds2780_get_current(dev_info, CURRENT_NOW, &current_uA);
323 if (ret < 0)
324 return ret;
325
326 ret = ds2780_get_capacity(dev_info, &capacity);
327 if (ret < 0)
328 return ret;
329
330 if (capacity == 100)
331 *status = POWER_SUPPLY_STATUS_FULL;
332 else if (current_uA == 0)
333 *status = POWER_SUPPLY_STATUS_NOT_CHARGING;
334 else if (current_uA < 0)
335 *status = POWER_SUPPLY_STATUS_DISCHARGING;
336 else
337 *status = POWER_SUPPLY_STATUS_CHARGING;
338
339 return 0;
340}
341
342static int ds2780_get_charge_now(struct ds2780_device_info *dev_info,
343 int *charge_now)
344{
345 int ret;
346 u16 charge_raw;
347
348 /*
349 * The RAAC value is located in 16 bits across the RAAC MSB and
350 * LSB registers
351 * Bits 15 - 8 of the RAAC value are in bits 7 - 0 of the RAAC
352 * MSB register
353 * Bits 7 - 0 of the RAAC value are in bits 7 - 0 of the RAAC
354 * LSB register
355 */
Clifton Barnes853eee72011-11-02 13:39:50 -0700356 ret = ds2780_read16(dev_info, &charge_raw, DS2780_RAAC_MSB_REG);
Clifton Barnes275ac742011-05-26 16:26:04 -0700357 if (ret < 0)
358 return ret;
359
360 *charge_now = charge_raw * 1600;
361 return 0;
362}
363
364static int ds2780_get_control_register(struct ds2780_device_info *dev_info,
365 u8 *control_reg)
366{
Clifton Barnes853eee72011-11-02 13:39:50 -0700367 return ds2780_read8(dev_info, control_reg, DS2780_CONTROL_REG);
Clifton Barnes275ac742011-05-26 16:26:04 -0700368}
369
370static int ds2780_set_control_register(struct ds2780_device_info *dev_info,
371 u8 control_reg)
372{
373 int ret;
374
Clifton Barnes853eee72011-11-02 13:39:50 -0700375 ret = ds2780_write(dev_info, &control_reg,
Clifton Barnes275ac742011-05-26 16:26:04 -0700376 DS2780_CONTROL_REG, sizeof(u8));
377 if (ret < 0)
378 return ret;
379
380 return ds2780_save_eeprom(dev_info, DS2780_CONTROL_REG);
381}
382
383static int ds2780_battery_get_property(struct power_supply *psy,
384 enum power_supply_property psp,
385 union power_supply_propval *val)
386{
387 int ret = 0;
388 struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
389
390 switch (psp) {
391 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
392 ret = ds2780_get_voltage(dev_info, &val->intval);
393 break;
394
395 case POWER_SUPPLY_PROP_TEMP:
396 ret = ds2780_get_temperature(dev_info, &val->intval);
397 break;
398
399 case POWER_SUPPLY_PROP_MODEL_NAME:
400 val->strval = model;
401 break;
402
403 case POWER_SUPPLY_PROP_MANUFACTURER:
404 val->strval = manufacturer;
405 break;
406
407 case POWER_SUPPLY_PROP_CURRENT_NOW:
408 ret = ds2780_get_current(dev_info, CURRENT_NOW, &val->intval);
409 break;
410
411 case POWER_SUPPLY_PROP_CURRENT_AVG:
412 ret = ds2780_get_current(dev_info, CURRENT_AVG, &val->intval);
413 break;
414
415 case POWER_SUPPLY_PROP_STATUS:
416 ret = ds2780_get_status(dev_info, &val->intval);
417 break;
418
419 case POWER_SUPPLY_PROP_CAPACITY:
420 ret = ds2780_get_capacity(dev_info, &val->intval);
421 break;
422
423 case POWER_SUPPLY_PROP_CHARGE_COUNTER:
424 ret = ds2780_get_accumulated_current(dev_info, &val->intval);
425 break;
426
427 case POWER_SUPPLY_PROP_CHARGE_NOW:
428 ret = ds2780_get_charge_now(dev_info, &val->intval);
429 break;
430
431 default:
432 ret = -EINVAL;
433 }
434
435 return ret;
436}
437
438static enum power_supply_property ds2780_battery_props[] = {
439 POWER_SUPPLY_PROP_STATUS,
440 POWER_SUPPLY_PROP_VOLTAGE_NOW,
441 POWER_SUPPLY_PROP_TEMP,
442 POWER_SUPPLY_PROP_MODEL_NAME,
443 POWER_SUPPLY_PROP_MANUFACTURER,
444 POWER_SUPPLY_PROP_CURRENT_NOW,
445 POWER_SUPPLY_PROP_CURRENT_AVG,
446 POWER_SUPPLY_PROP_CAPACITY,
447 POWER_SUPPLY_PROP_CHARGE_COUNTER,
448 POWER_SUPPLY_PROP_CHARGE_NOW,
449};
450
451static ssize_t ds2780_get_pmod_enabled(struct device *dev,
452 struct device_attribute *attr,
453 char *buf)
454{
455 int ret;
456 u8 control_reg;
457 struct power_supply *psy = to_power_supply(dev);
458 struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
459
460 /* Get power mode */
461 ret = ds2780_get_control_register(dev_info, &control_reg);
462 if (ret < 0)
463 return ret;
464
465 return sprintf(buf, "%d\n",
466 !!(control_reg & DS2780_CONTROL_REG_PMOD));
467}
468
469static ssize_t ds2780_set_pmod_enabled(struct device *dev,
470 struct device_attribute *attr,
471 const char *buf,
472 size_t count)
473{
474 int ret;
475 u8 control_reg, new_setting;
476 struct power_supply *psy = to_power_supply(dev);
477 struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
478
479 /* Set power mode */
480 ret = ds2780_get_control_register(dev_info, &control_reg);
481 if (ret < 0)
482 return ret;
483
484 ret = kstrtou8(buf, 0, &new_setting);
485 if (ret < 0)
486 return ret;
487
488 if ((new_setting != 0) && (new_setting != 1)) {
489 dev_err(dev_info->dev, "Invalid pmod setting (0 or 1)\n");
490 return -EINVAL;
491 }
492
493 if (new_setting)
494 control_reg |= DS2780_CONTROL_REG_PMOD;
495 else
496 control_reg &= ~DS2780_CONTROL_REG_PMOD;
497
498 ret = ds2780_set_control_register(dev_info, control_reg);
499 if (ret < 0)
500 return ret;
501
502 return count;
503}
504
505static ssize_t ds2780_get_sense_resistor_value(struct device *dev,
506 struct device_attribute *attr,
507 char *buf)
508{
509 int ret;
510 u8 sense_resistor;
511 struct power_supply *psy = to_power_supply(dev);
512 struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
513
Clifton Barnes853eee72011-11-02 13:39:50 -0700514 ret = ds2780_read8(dev_info, &sense_resistor, DS2780_RSNSP_REG);
Clifton Barnes275ac742011-05-26 16:26:04 -0700515 if (ret < 0)
516 return ret;
517
518 ret = sprintf(buf, "%d\n", sense_resistor);
519 return ret;
520}
521
522static ssize_t ds2780_set_sense_resistor_value(struct device *dev,
523 struct device_attribute *attr,
524 const char *buf,
525 size_t count)
526{
527 int ret;
528 u8 new_setting;
529 struct power_supply *psy = to_power_supply(dev);
530 struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
531
532 ret = kstrtou8(buf, 0, &new_setting);
533 if (ret < 0)
534 return ret;
535
536 ret = ds2780_set_sense_register(dev_info, new_setting);
537 if (ret < 0)
538 return ret;
539
540 return count;
541}
542
543static ssize_t ds2780_get_rsgain_setting(struct device *dev,
544 struct device_attribute *attr,
545 char *buf)
546{
547 int ret;
548 u16 rsgain;
549 struct power_supply *psy = to_power_supply(dev);
550 struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
551
552 ret = ds2780_get_rsgain_register(dev_info, &rsgain);
553 if (ret < 0)
554 return ret;
555
556 return sprintf(buf, "%d\n", rsgain);
557}
558
559static ssize_t ds2780_set_rsgain_setting(struct device *dev,
560 struct device_attribute *attr,
561 const char *buf,
562 size_t count)
563{
564 int ret;
565 u16 new_setting;
566 struct power_supply *psy = to_power_supply(dev);
567 struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
568
569 ret = kstrtou16(buf, 0, &new_setting);
570 if (ret < 0)
571 return ret;
572
573 /* Gain can only be from 0 to 1.999 in steps of .001 */
574 if (new_setting > 1999) {
575 dev_err(dev_info->dev, "Invalid rsgain setting (0 - 1999)\n");
576 return -EINVAL;
577 }
578
579 ret = ds2780_set_rsgain_register(dev_info, new_setting);
580 if (ret < 0)
581 return ret;
582
583 return count;
584}
585
586static ssize_t ds2780_get_pio_pin(struct device *dev,
587 struct device_attribute *attr,
588 char *buf)
589{
590 int ret;
591 u8 sfr;
592 struct power_supply *psy = to_power_supply(dev);
593 struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
594
Clifton Barnes853eee72011-11-02 13:39:50 -0700595 ret = ds2780_read8(dev_info, &sfr, DS2780_SFR_REG);
Clifton Barnes275ac742011-05-26 16:26:04 -0700596 if (ret < 0)
597 return ret;
598
599 ret = sprintf(buf, "%d\n", sfr & DS2780_SFR_REG_PIOSC);
600 return ret;
601}
602
603static ssize_t ds2780_set_pio_pin(struct device *dev,
604 struct device_attribute *attr,
605 const char *buf,
606 size_t count)
607{
608 int ret;
609 u8 new_setting;
610 struct power_supply *psy = to_power_supply(dev);
611 struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
612
613 ret = kstrtou8(buf, 0, &new_setting);
614 if (ret < 0)
615 return ret;
616
617 if ((new_setting != 0) && (new_setting != 1)) {
618 dev_err(dev_info->dev, "Invalid pio_pin setting (0 or 1)\n");
619 return -EINVAL;
620 }
621
Clifton Barnes853eee72011-11-02 13:39:50 -0700622 ret = ds2780_write(dev_info, &new_setting,
Clifton Barnes275ac742011-05-26 16:26:04 -0700623 DS2780_SFR_REG, sizeof(u8));
624 if (ret < 0)
625 return ret;
626
627 return count;
628}
629
630static ssize_t ds2780_read_param_eeprom_bin(struct file *filp,
631 struct kobject *kobj,
632 struct bin_attribute *bin_attr,
633 char *buf, loff_t off, size_t count)
634{
635 struct device *dev = container_of(kobj, struct device, kobj);
636 struct power_supply *psy = to_power_supply(dev);
637 struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
638
639 count = min_t(loff_t, count,
640 DS2780_EEPROM_BLOCK1_END -
641 DS2780_EEPROM_BLOCK1_START + 1 - off);
642
Clifton Barnes853eee72011-11-02 13:39:50 -0700643 return ds2780_read_block(dev_info, buf,
Clifton Barnes275ac742011-05-26 16:26:04 -0700644 DS2780_EEPROM_BLOCK1_START + off, count);
645}
646
647static ssize_t ds2780_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 ds2780_device_info *dev_info = to_ds2780_device_info(psy);
655 int ret;
656
657 count = min_t(loff_t, count,
658 DS2780_EEPROM_BLOCK1_END -
659 DS2780_EEPROM_BLOCK1_START + 1 - off);
660
Clifton Barnes853eee72011-11-02 13:39:50 -0700661 ret = ds2780_write(dev_info, buf,
Clifton Barnes275ac742011-05-26 16:26:04 -0700662 DS2780_EEPROM_BLOCK1_START + off, count);
663 if (ret < 0)
664 return ret;
665
666 ret = ds2780_save_eeprom(dev_info, DS2780_EEPROM_BLOCK1_START);
667 if (ret < 0)
668 return ret;
669
670 return count;
671}
672
673static struct bin_attribute ds2780_param_eeprom_bin_attr = {
674 .attr = {
675 .name = "param_eeprom",
676 .mode = S_IRUGO | S_IWUSR,
677 },
678 .size = DS2780_EEPROM_BLOCK1_END - DS2780_EEPROM_BLOCK1_START + 1,
679 .read = ds2780_read_param_eeprom_bin,
680 .write = ds2780_write_param_eeprom_bin,
681};
682
683static ssize_t ds2780_read_user_eeprom_bin(struct file *filp,
684 struct kobject *kobj,
685 struct bin_attribute *bin_attr,
686 char *buf, loff_t off, size_t count)
687{
688 struct device *dev = container_of(kobj, struct device, kobj);
689 struct power_supply *psy = to_power_supply(dev);
690 struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
691
692 count = min_t(loff_t, count,
693 DS2780_EEPROM_BLOCK0_END -
694 DS2780_EEPROM_BLOCK0_START + 1 - off);
695
Clifton Barnes853eee72011-11-02 13:39:50 -0700696 return ds2780_read_block(dev_info, buf,
Clifton Barnes275ac742011-05-26 16:26:04 -0700697 DS2780_EEPROM_BLOCK0_START + off, count);
Clifton Barnes275ac742011-05-26 16:26:04 -0700698}
699
700static ssize_t ds2780_write_user_eeprom_bin(struct file *filp,
701 struct kobject *kobj,
702 struct bin_attribute *bin_attr,
703 char *buf, loff_t off, size_t count)
704{
705 struct device *dev = container_of(kobj, struct device, kobj);
706 struct power_supply *psy = to_power_supply(dev);
707 struct ds2780_device_info *dev_info = to_ds2780_device_info(psy);
708 int ret;
709
710 count = min_t(loff_t, count,
711 DS2780_EEPROM_BLOCK0_END -
712 DS2780_EEPROM_BLOCK0_START + 1 - off);
713
Clifton Barnes853eee72011-11-02 13:39:50 -0700714 ret = ds2780_write(dev_info, buf,
Clifton Barnes275ac742011-05-26 16:26:04 -0700715 DS2780_EEPROM_BLOCK0_START + off, count);
716 if (ret < 0)
717 return ret;
718
719 ret = ds2780_save_eeprom(dev_info, DS2780_EEPROM_BLOCK0_START);
720 if (ret < 0)
721 return ret;
722
723 return count;
724}
725
726static struct bin_attribute ds2780_user_eeprom_bin_attr = {
727 .attr = {
728 .name = "user_eeprom",
729 .mode = S_IRUGO | S_IWUSR,
730 },
731 .size = DS2780_EEPROM_BLOCK0_END - DS2780_EEPROM_BLOCK0_START + 1,
732 .read = ds2780_read_user_eeprom_bin,
733 .write = ds2780_write_user_eeprom_bin,
734};
735
736static DEVICE_ATTR(pmod_enabled, S_IRUGO | S_IWUSR, ds2780_get_pmod_enabled,
737 ds2780_set_pmod_enabled);
738static DEVICE_ATTR(sense_resistor_value, S_IRUGO | S_IWUSR,
739 ds2780_get_sense_resistor_value, ds2780_set_sense_resistor_value);
740static DEVICE_ATTR(rsgain_setting, S_IRUGO | S_IWUSR, ds2780_get_rsgain_setting,
741 ds2780_set_rsgain_setting);
742static DEVICE_ATTR(pio_pin, S_IRUGO | S_IWUSR, ds2780_get_pio_pin,
743 ds2780_set_pio_pin);
744
745
746static struct attribute *ds2780_attributes[] = {
747 &dev_attr_pmod_enabled.attr,
748 &dev_attr_sense_resistor_value.attr,
749 &dev_attr_rsgain_setting.attr,
750 &dev_attr_pio_pin.attr,
751 NULL
752};
753
754static const struct attribute_group ds2780_attr_group = {
755 .attrs = ds2780_attributes,
756};
757
758static int __devinit ds2780_battery_probe(struct platform_device *pdev)
759{
760 int ret = 0;
761 struct ds2780_device_info *dev_info;
762
763 dev_info = kzalloc(sizeof(*dev_info), GFP_KERNEL);
764 if (!dev_info) {
765 ret = -ENOMEM;
766 goto fail;
767 }
768
769 platform_set_drvdata(pdev, dev_info);
770
771 dev_info->dev = &pdev->dev;
772 dev_info->w1_dev = pdev->dev.parent;
773 dev_info->bat.name = dev_name(&pdev->dev);
774 dev_info->bat.type = POWER_SUPPLY_TYPE_BATTERY;
775 dev_info->bat.properties = ds2780_battery_props;
776 dev_info->bat.num_properties = ARRAY_SIZE(ds2780_battery_props);
777 dev_info->bat.get_property = ds2780_battery_get_property;
778
779 ret = power_supply_register(&pdev->dev, &dev_info->bat);
780 if (ret) {
781 dev_err(dev_info->dev, "failed to register battery\n");
782 goto fail_free_info;
783 }
784
785 ret = sysfs_create_group(&dev_info->bat.dev->kobj, &ds2780_attr_group);
786 if (ret) {
787 dev_err(dev_info->dev, "failed to create sysfs group\n");
788 goto fail_unregister;
789 }
790
791 ret = sysfs_create_bin_file(&dev_info->bat.dev->kobj,
792 &ds2780_param_eeprom_bin_attr);
793 if (ret) {
794 dev_err(dev_info->dev,
795 "failed to create param eeprom bin file");
796 goto fail_remove_group;
797 }
798
799 ret = sysfs_create_bin_file(&dev_info->bat.dev->kobj,
800 &ds2780_user_eeprom_bin_attr);
801 if (ret) {
802 dev_err(dev_info->dev,
803 "failed to create user eeprom bin file");
804 goto fail_remove_bin_file;
805 }
806
807 return 0;
808
809fail_remove_bin_file:
810 sysfs_remove_bin_file(&dev_info->bat.dev->kobj,
811 &ds2780_param_eeprom_bin_attr);
812fail_remove_group:
813 sysfs_remove_group(&dev_info->bat.dev->kobj, &ds2780_attr_group);
814fail_unregister:
815 power_supply_unregister(&dev_info->bat);
816fail_free_info:
817 kfree(dev_info);
818fail:
819 return ret;
820}
821
822static int __devexit ds2780_battery_remove(struct platform_device *pdev)
823{
824 struct ds2780_device_info *dev_info = platform_get_drvdata(pdev);
825
826 /* remove attributes */
827 sysfs_remove_group(&dev_info->bat.dev->kobj, &ds2780_attr_group);
828
829 power_supply_unregister(&dev_info->bat);
830
831 kfree(dev_info);
832 return 0;
833}
834
Clifton Barnes275ac742011-05-26 16:26:04 -0700835static struct platform_driver ds2780_battery_driver = {
836 .driver = {
837 .name = "ds2780-battery",
838 },
839 .probe = ds2780_battery_probe,
Axel Lin0bea4b82011-07-07 21:15:13 +0800840 .remove = __devexit_p(ds2780_battery_remove),
Clifton Barnes275ac742011-05-26 16:26:04 -0700841};
842
Axel Lin300bac72011-11-26 12:01:10 +0800843module_platform_driver(ds2780_battery_driver);
Clifton Barnes275ac742011-05-26 16:26:04 -0700844
845MODULE_LICENSE("GPL");
846MODULE_AUTHOR("Clifton Barnes <cabarnes@indesign-llc.com>");
847MODULE_DESCRIPTION("Maxim/Dallas DS2780 Stand-Alone Fuel Gauage IC driver");
Axel Lin300bac72011-11-26 12:01:10 +0800848MODULE_ALIAS("platform:ds2780-battery");