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;
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
52static inline struct ds2780_device_info *
53to_ds2780_device_info(struct power_supply *psy)
54{
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
63static inline int ds2780_battery_io(struct ds2780_device_info *dev_info,
64	char *buf, int addr, size_t count, int io)
65{
66	return w1_ds2780_io(dev_info->w1_dev, buf, addr, count, io);
67}
68
69static 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)
77{
78	int ret;
79	u8 raw[2];
80
81	ret = ds2780_battery_io(dev_info, raw, addr, sizeof(raw), 0);
82	if (ret < 0)
83		return ret;
84
85	*val = (raw[0] << 8) | raw[1];
86
87	return 0;
88}
89
90static inline int ds2780_read_block(struct ds2780_device_info *dev_info,
91	u8 *val, int addr, size_t count)
92{
93	return ds2780_battery_io(dev_info, val, addr, count, 0);
94}
95
96static inline int ds2780_write(struct ds2780_device_info *dev_info, u8 *val,
97	int addr, size_t count)
98{
99	return ds2780_battery_io(dev_info, val, addr, count, 1);
100}
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
133	ret = ds2780_write(dev_info, &conductance,
134				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{
145	return ds2780_read16(dev_info, rsgain, DS2780_RSGAIN_MSB_REG);
146}
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
155	ret = ds2780_write(dev_info, raw,
156				DS2780_RSGAIN_MSB_REG, sizeof(raw));
157	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	 */
178	ret = ds2780_read16(dev_info, &voltage_raw,
179				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	 */
207	ret = ds2780_read16(dev_info, &temperature_raw,
208				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	 */
233	ret = ds2780_read8(dev_info, &sense_res_raw, DS2780_RSNSP_REG);
234	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");
239		return -EINVAL;
240	}
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	 */
259	ret = ds2780_read16(dev_info, &current_raw, reg_msb);
260	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	 */
278	ret = ds2780_read8(dev_info, &sense_res_raw, DS2780_RSNSP_REG);
279	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	 */
296	ret = ds2780_read16(dev_info, &current_raw, DS2780_ACR_MSB_REG);
297	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
310	ret = ds2780_read8(dev_info, &raw, DS2780_RARC_REG);
311	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	 */
356	ret = ds2780_read16(dev_info, &charge_raw, DS2780_RAAC_MSB_REG);
357	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{
367	return ds2780_read8(dev_info, control_reg, DS2780_CONTROL_REG);
368}
369
370static int ds2780_set_control_register(struct ds2780_device_info *dev_info,
371	u8 control_reg)
372{
373	int ret;
374
375	ret = ds2780_write(dev_info, &control_reg,
376				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
514	ret = ds2780_read8(dev_info, &sense_resistor, DS2780_RSNSP_REG);
515	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
595	ret = ds2780_read8(dev_info, &sfr, DS2780_SFR_REG);
596	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
622	ret = ds2780_write(dev_info, &new_setting,
623				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
643	return ds2780_read_block(dev_info, buf,
644				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
661	ret = ds2780_write(dev_info, buf,
662				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
696	return ds2780_read_block(dev_info, buf,
697				DS2780_EEPROM_BLOCK0_START + off, count);
698}
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
714	ret = ds2780_write(dev_info, buf,
715				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 ds2780_battery_probe(struct platform_device *pdev)
759{
760	int ret = 0;
761	struct ds2780_device_info *dev_info;
762
763	dev_info = devm_kzalloc(&pdev->dev, 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;
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:
817	return ret;
818}
819
820static int ds2780_battery_remove(struct platform_device *pdev)
821{
822	struct ds2780_device_info *dev_info = platform_get_drvdata(pdev);
823
824	/* remove attributes */
825	sysfs_remove_group(&dev_info->bat.dev->kobj, &ds2780_attr_group);
826
827	power_supply_unregister(&dev_info->bat);
828
829	return 0;
830}
831
832static struct platform_driver ds2780_battery_driver = {
833	.driver = {
834		.name = "ds2780-battery",
835	},
836	.probe	  = ds2780_battery_probe,
837	.remove   = ds2780_battery_remove,
838};
839
840module_platform_driver(ds2780_battery_driver);
841
842MODULE_LICENSE("GPL");
843MODULE_AUTHOR("Clifton Barnes <cabarnes@indesign-llc.com>");
844MODULE_DESCRIPTION("Maxim/Dallas DS2780 Stand-Alone Fuel Gauage IC driver");
845MODULE_ALIAS("platform:ds2780-battery");
846