drivers/power/supply/mm8013.c at v6.7-rc7

tjh.dev / kernel
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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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kernel / drivers / power / supply / mm8013.c
at v6.7-rc7 317 lines 8.3 kB view raw
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  1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Copyright (c) 2016-2019 The Linux Foundation. All rights reserved.
  4 * Copyright (c) 2023, Linaro Limited
  5 */
  6#include <linux/delay.h>
  7#include <linux/i2c.h>
  8#include <linux/power_supply.h>
  9#include <linux/regmap.h>
 10
 11#define REG_BATID			0x00 /* This one is very unclear */
 12 #define BATID_101			0x0101 /* 107kOhm */
 13 #define BATID_102			0x0102 /* 10kOhm */
 14#define REG_TEMPERATURE			0x06
 15#define REG_VOLTAGE			0x08
 16#define REG_FLAGS			0x0a
 17 #define MM8013_FLAG_OTC		BIT(15)
 18 #define MM8013_FLAG_OTD		BIT(14)
 19 #define MM8013_FLAG_BATHI		BIT(13)
 20 #define MM8013_FLAG_BATLOW		BIT(12)
 21 #define MM8013_FLAG_CHG_INH		BIT(11)
 22 #define MM8013_FLAG_FC			BIT(9)
 23 #define MM8013_FLAG_CHG		BIT(8)
 24 #define MM8013_FLAG_OCC		BIT(6)
 25 #define MM8013_FLAG_ODC		BIT(5)
 26 #define MM8013_FLAG_OT			BIT(4)
 27 #define MM8013_FLAG_UT			BIT(3)
 28 #define MM8013_FLAG_DSG		BIT(0)
 29#define REG_FULL_CHARGE_CAPACITY	0x0e
 30#define REG_NOMINAL_CHARGE_CAPACITY	0x0c
 31#define REG_AVERAGE_CURRENT		0x14
 32#define REG_AVERAGE_TIME_TO_EMPTY	0x16
 33#define REG_AVERAGE_TIME_TO_FULL	0x18
 34#define REG_MAX_LOAD_CURRENT		0x1e
 35#define REG_CYCLE_COUNT			0x2a
 36#define REG_STATE_OF_CHARGE		0x2c
 37#define REG_DESIGN_CAPACITY		0x3c
 38/* TODO: 0x62-0x68 seem to contain 'MM8013C' in a length-prefixed, non-terminated string */
 39
 40#define DECIKELVIN_TO_DECIDEGC(t)	(t - 2731)
 41
 42struct mm8013_chip {
 43	struct i2c_client *client;
 44	struct regmap *regmap;
 45};
 46
 47static int mm8013_checkdevice(struct mm8013_chip *chip)
 48{
 49	int battery_id, ret;
 50	u32 val;
 51
 52	ret = regmap_write(chip->regmap, REG_BATID, 0x0008);
 53	if (ret < 0)
 54		return ret;
 55
 56	ret = regmap_read(chip->regmap, REG_BATID, &val);
 57	if (ret < 0)
 58		return ret;
 59
 60	if (val == BATID_102)
 61		battery_id = 2;
 62	else if (val == BATID_101)
 63		battery_id = 1;
 64	else
 65		return -EINVAL;
 66
 67	dev_dbg(&chip->client->dev, "battery_id: %d\n", battery_id);
 68
 69	return 0;
 70}
 71
 72static enum power_supply_property mm8013_battery_props[] = {
 73	POWER_SUPPLY_PROP_CAPACITY,
 74	POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR,
 75	POWER_SUPPLY_PROP_CHARGE_FULL,
 76	POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 77	POWER_SUPPLY_PROP_CHARGE_NOW,
 78	POWER_SUPPLY_PROP_CURRENT_MAX,
 79	POWER_SUPPLY_PROP_CURRENT_NOW,
 80	POWER_SUPPLY_PROP_CYCLE_COUNT,
 81	POWER_SUPPLY_PROP_HEALTH,
 82	POWER_SUPPLY_PROP_PRESENT,
 83	POWER_SUPPLY_PROP_STATUS,
 84	POWER_SUPPLY_PROP_TEMP,
 85	POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
 86	POWER_SUPPLY_PROP_TIME_TO_FULL_AVG,
 87	POWER_SUPPLY_PROP_VOLTAGE_NOW,
 88};
 89
 90static int mm8013_get_property(struct power_supply *psy,
 91			       enum power_supply_property psp,
 92			       union power_supply_propval *val)
 93{
 94	struct mm8013_chip *chip = psy->drv_data;
 95	int ret = 0;
 96	u32 regval;
 97
 98	switch (psp) {
 99	case POWER_SUPPLY_PROP_CAPACITY:
100		ret = regmap_read(chip->regmap, REG_STATE_OF_CHARGE, &regval);
101		if (ret < 0)
102			return ret;
103
104		val->intval = regval;
105		break;
106	case POWER_SUPPLY_PROP_CHARGE_BEHAVIOUR:
107		ret = regmap_read(chip->regmap, REG_FLAGS, &regval);
108		if (ret < 0)
109			return ret;
110
111		if (regval & MM8013_FLAG_CHG_INH)
112			val->intval = POWER_SUPPLY_CHARGE_BEHAVIOUR_INHIBIT_CHARGE;
113		else
114			val->intval = POWER_SUPPLY_CHARGE_BEHAVIOUR_AUTO;
115		break;
116	case POWER_SUPPLY_PROP_CHARGE_FULL:
117		ret = regmap_read(chip->regmap, REG_FULL_CHARGE_CAPACITY, &regval);
118		if (ret < 0)
119			return ret;
120
121		val->intval = 1000 * regval;
122		break;
123	case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
124		ret = regmap_read(chip->regmap, REG_DESIGN_CAPACITY, &regval);
125		if (ret < 0)
126			return ret;
127
128		val->intval = 1000 * regval;
129		break;
130	case POWER_SUPPLY_PROP_CHARGE_NOW:
131		ret = regmap_read(chip->regmap, REG_NOMINAL_CHARGE_CAPACITY, &regval);
132		if (ret < 0)
133			return ret;
134
135		val->intval = 1000 * regval;
136		break;
137	case POWER_SUPPLY_PROP_CURRENT_MAX:
138		ret = regmap_read(chip->regmap, REG_MAX_LOAD_CURRENT, &regval);
139		if (ret < 0)
140			return ret;
141
142		val->intval = -1000 * (s16)regval;
143		break;
144	case POWER_SUPPLY_PROP_CURRENT_NOW:
145		ret = regmap_read(chip->regmap, REG_AVERAGE_CURRENT, &regval);
146		if (ret < 0)
147			return ret;
148
149		val->intval = -1000 * (s16)regval;
150		break;
151	case POWER_SUPPLY_PROP_CYCLE_COUNT:
152		ret = regmap_read(chip->regmap, REG_CYCLE_COUNT, &regval);
153		if (ret < 0)
154			return ret;
155
156		val->intval = regval;
157		break;
158	case POWER_SUPPLY_PROP_HEALTH:
159		ret = regmap_read(chip->regmap, REG_FLAGS, &regval);
160		if (ret < 0)
161			return ret;
162
163		if (regval & MM8013_FLAG_UT)
164			val->intval = POWER_SUPPLY_HEALTH_COLD;
165		else if (regval & (MM8013_FLAG_ODC | MM8013_FLAG_OCC))
166			val->intval = POWER_SUPPLY_HEALTH_OVERCURRENT;
167		else if (regval & (MM8013_FLAG_BATLOW))
168			val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
169		else if (regval & MM8013_FLAG_BATHI)
170			val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
171		else if (regval & (MM8013_FLAG_OT | MM8013_FLAG_OTD | MM8013_FLAG_OTC))
172			val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
173		else
174			val->intval = POWER_SUPPLY_HEALTH_GOOD;
175		break;
176	case POWER_SUPPLY_PROP_PRESENT:
177		ret = regmap_read(chip->regmap, REG_TEMPERATURE, &regval);
178		if (ret < 0)
179			return ret;
180
181		val->intval = ((s16)regval > 0);
182		break;
183	case POWER_SUPPLY_PROP_STATUS:
184		ret = regmap_read(chip->regmap, REG_FLAGS, &regval);
185		if (ret < 0)
186			return ret;
187
188		if (regval & MM8013_FLAG_DSG)
189			val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
190		else if (regval & MM8013_FLAG_CHG)
191			val->intval = POWER_SUPPLY_STATUS_CHARGING;
192		else if (regval & MM8013_FLAG_FC)
193			val->intval = POWER_SUPPLY_STATUS_FULL;
194		else
195			val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
196		break;
197	case POWER_SUPPLY_PROP_TEMP:
198		ret = regmap_read(chip->regmap, REG_TEMPERATURE, &regval);
199		if (ret < 0)
200			return ret;
201
202		val->intval = DECIKELVIN_TO_DECIDEGC(regval);
203		break;
204	case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
205		ret = regmap_read(chip->regmap, REG_AVERAGE_TIME_TO_EMPTY, &regval);
206		if (ret < 0)
207			return ret;
208
209		/* The estimation is not yet ready */
210		if (regval == U16_MAX)
211			return -ENODATA;
212
213		val->intval = regval;
214		break;
215	case POWER_SUPPLY_PROP_TIME_TO_FULL_AVG:
216		ret = regmap_read(chip->regmap, REG_AVERAGE_TIME_TO_FULL, &regval);
217		if (ret < 0)
218			return ret;
219
220		/* The estimation is not yet ready */
221		if (regval == U16_MAX)
222			return -ENODATA;
223
224		val->intval = regval;
225		break;
226	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
227		ret = regmap_read(chip->regmap, REG_VOLTAGE, &regval);
228		if (ret < 0)
229			return ret;
230
231		val->intval = 1000 * regval;
232		break;
233	default:
234		return -EINVAL;
235	}
236
237	return 0;
238}
239
240static const struct power_supply_desc mm8013_desc = {
241	.name			= "mm8013",
242	.type			= POWER_SUPPLY_TYPE_BATTERY,
243	.properties		= mm8013_battery_props,
244	.num_properties		= ARRAY_SIZE(mm8013_battery_props),
245	.get_property		= mm8013_get_property,
246};
247
248static const struct regmap_config mm8013_regmap_config = {
249	.reg_bits = 8,
250	.val_bits = 16,
251	.max_register = 0x68,
252	.use_single_read = true,
253	.use_single_write = true,
254	.val_format_endian = REGMAP_ENDIAN_LITTLE,
255};
256
257static int mm8013_probe(struct i2c_client *client)
258{
259	struct power_supply_config psy_cfg = {};
260	struct device *dev = &client->dev;
261	struct power_supply *psy;
262	struct mm8013_chip *chip;
263	int ret = 0;
264
265	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA))
266		return dev_err_probe(dev, -EIO,
267				     "I2C_FUNC_SMBUS_WORD_DATA not supported\n");
268
269	chip = devm_kzalloc(dev, sizeof(struct mm8013_chip), GFP_KERNEL);
270	if (!chip)
271		return -ENOMEM;
272
273	chip->client = client;
274
275	chip->regmap = devm_regmap_init_i2c(client, &mm8013_regmap_config);
276	if (IS_ERR(chip->regmap)) {
277		ret = PTR_ERR(chip->regmap);
278		return dev_err_probe(dev, ret, "Couldn't initialize regmap\n");
279	}
280
281	ret = mm8013_checkdevice(chip);
282	if (ret)
283		return dev_err_probe(dev, ret, "MM8013 not found\n");
284
285	psy_cfg.drv_data = chip;
286	psy_cfg.of_node = dev->of_node;
287
288	psy = devm_power_supply_register(dev, &mm8013_desc, &psy_cfg);
289	if (IS_ERR(psy))
290		return PTR_ERR(psy);
291
292	return 0;
293}
294
295static const struct i2c_device_id mm8013_id_table[] = {
296	{ "mm8013", 0 },
297	{}
298};
299MODULE_DEVICE_TABLE(i2c, mm8013_id_table);
300
301static const struct of_device_id mm8013_match_table[] = {
302	{ .compatible = "mitsumi,mm8013" },
303	{}
304};
305
306static struct i2c_driver mm8013_i2c_driver = {
307	.probe = mm8013_probe,
308	.id_table = mm8013_id_table,
309	.driver = {
310		.name = "mm8013",
311		.of_match_table = mm8013_match_table,
312	},
313};
314module_i2c_driver(mm8013_i2c_driver);
315
316MODULE_DESCRIPTION("MM8013 fuel gauge driver");
317MODULE_LICENSE("GPL");
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