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