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
|
/*
* max17040_battery.c
* fuel-gauge systems for lithium-ion (Li+) batteries
*
* Copyright (C) 2009 Samsung Electronics
* Minkyu Kang <mk7.kang@samsung.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/mutex.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/delay.h>
#include <linux/power_supply.h>
#include <linux/max17040_battery.h>
#include <linux/slab.h>
#define MAX17040_VCELL 0x02
#define MAX17040_SOC 0x04
#define MAX17040_MODE 0x06
#define MAX17040_VER 0x08
#define MAX17040_RCOMP 0x0C
#define MAX17040_CMD 0xFE
#define MAX17040_DELAY 1000
#define MAX17040_BATTERY_FULL 95
struct max17040_chip {
struct i2c_client *client;
struct delayed_work work;
struct power_supply *battery;
struct max17040_platform_data *pdata;
/* State Of Connect */
int online;
/* battery voltage */
int vcell;
/* battery capacity */
int soc;
/* State Of Charge */
int status;
};
static int max17040_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct max17040_chip *chip = power_supply_get_drvdata(psy);
switch (psp) {
case POWER_SUPPLY_PROP_STATUS:
val->intval = chip->status;
break;
case POWER_SUPPLY_PROP_ONLINE:
val->intval = chip->online;
break;
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
val->intval = chip->vcell;
break;
case POWER_SUPPLY_PROP_CAPACITY:
val->intval = chip->soc;
break;
default:
return -EINVAL;
}
return 0;
}
static int max17040_write_reg(struct i2c_client *client, int reg, u16 value)
{
int ret;
ret = i2c_smbus_write_word_swapped(client, reg, value);
if (ret < 0)
dev_err(&client->dev, "%s: err %d\n", __func__, ret);
return ret;
}
static int max17040_read_reg(struct i2c_client *client, int reg)
{
int ret;
ret = i2c_smbus_read_word_swapped(client, reg);
if (ret < 0)
dev_err(&client->dev, "%s: err %d\n", __func__, ret);
return ret;
}
static void max17040_reset(struct i2c_client *client)
{
max17040_write_reg(client, MAX17040_CMD, 0x0054);
}
static void max17040_get_vcell(struct i2c_client *client)
{
struct max17040_chip *chip = i2c_get_clientdata(client);
u16 vcell;
vcell = max17040_read_reg(client, MAX17040_VCELL);
chip->vcell = (vcell >> 4) * 1250;
}
static void max17040_get_soc(struct i2c_client *client)
{
struct max17040_chip *chip = i2c_get_clientdata(client);
u16 soc;
soc = max17040_read_reg(client, MAX17040_SOC);
chip->soc = (soc >> 8);
}
static void max17040_get_version(struct i2c_client *client)
{
u16 version;
version = max17040_read_reg(client, MAX17040_VER);
dev_info(&client->dev, "MAX17040 Fuel-Gauge Ver 0x%x\n", version);
}
static void max17040_get_online(struct i2c_client *client)
{
struct max17040_chip *chip = i2c_get_clientdata(client);
if (chip->pdata && chip->pdata->battery_online)
chip->online = chip->pdata->battery_online();
else
chip->online = 1;
}
static void max17040_get_status(struct i2c_client *client)
{
struct max17040_chip *chip = i2c_get_clientdata(client);
if (!chip->pdata || !chip->pdata->charger_online
|| !chip->pdata->charger_enable) {
chip->status = POWER_SUPPLY_STATUS_UNKNOWN;
return;
}
if (chip->pdata->charger_online()) {
if (chip->pdata->charger_enable())
chip->status = POWER_SUPPLY_STATUS_CHARGING;
else
chip->status = POWER_SUPPLY_STATUS_NOT_CHARGING;
} else {
chip->status = POWER_SUPPLY_STATUS_DISCHARGING;
}
if (chip->soc > MAX17040_BATTERY_FULL)
chip->status = POWER_SUPPLY_STATUS_FULL;
}
static void max17040_work(struct work_struct *work)
{
struct max17040_chip *chip;
chip = container_of(work, struct max17040_chip, work.work);
max17040_get_vcell(chip->client);
max17040_get_soc(chip->client);
max17040_get_online(chip->client);
max17040_get_status(chip->client);
queue_delayed_work(system_power_efficient_wq, &chip->work,
MAX17040_DELAY);
}
static enum power_supply_property max17040_battery_props[] = {
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_ONLINE,
POWER_SUPPLY_PROP_VOLTAGE_NOW,
POWER_SUPPLY_PROP_CAPACITY,
};
static const struct power_supply_desc max17040_battery_desc = {
.name = "battery",
.type = POWER_SUPPLY_TYPE_BATTERY,
.get_property = max17040_get_property,
.properties = max17040_battery_props,
.num_properties = ARRAY_SIZE(max17040_battery_props),
};
static int max17040_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
struct power_supply_config psy_cfg = {};
struct max17040_chip *chip;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
return -EIO;
chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
if (!chip)
return -ENOMEM;
chip->client = client;
chip->pdata = client->dev.platform_data;
i2c_set_clientdata(client, chip);
psy_cfg.drv_data = chip;
chip->battery = power_supply_register(&client->dev,
&max17040_battery_desc, &psy_cfg);
if (IS_ERR(chip->battery)) {
dev_err(&client->dev, "failed: power supply register\n");
return PTR_ERR(chip->battery);
}
max17040_reset(client);
max17040_get_version(client);
INIT_DEFERRABLE_WORK(&chip->work, max17040_work);
queue_delayed_work(system_power_efficient_wq, &chip->work,
MAX17040_DELAY);
return 0;
}
static int max17040_remove(struct i2c_client *client)
{
struct max17040_chip *chip = i2c_get_clientdata(client);
power_supply_unregister(chip->battery);
cancel_delayed_work(&chip->work);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int max17040_suspend(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct max17040_chip *chip = i2c_get_clientdata(client);
cancel_delayed_work(&chip->work);
return 0;
}
static int max17040_resume(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct max17040_chip *chip = i2c_get_clientdata(client);
queue_delayed_work(system_power_efficient_wq, &chip->work,
MAX17040_DELAY);
return 0;
}
static SIMPLE_DEV_PM_OPS(max17040_pm_ops, max17040_suspend, max17040_resume);
#define MAX17040_PM_OPS (&max17040_pm_ops)
#else
#define MAX17040_PM_OPS NULL
#endif /* CONFIG_PM_SLEEP */
static const struct i2c_device_id max17040_id[] = {
{ "max17040" },
{ "max77836-battery" },
{ }
};
MODULE_DEVICE_TABLE(i2c, max17040_id);
static const struct of_device_id max17040_of_match[] = {
{ .compatible = "maxim,max17040" },
{ .compatible = "maxim,max77836-battery" },
{ },
};
MODULE_DEVICE_TABLE(of, max17040_of_match);
static struct i2c_driver max17040_i2c_driver = {
.driver = {
.name = "max17040",
.of_match_table = max17040_of_match,
.pm = MAX17040_PM_OPS,
},
.probe = max17040_probe,
.remove = max17040_remove,
.id_table = max17040_id,
};
module_i2c_driver(max17040_i2c_driver);
MODULE_AUTHOR("Minkyu Kang <mk7.kang@samsung.com>");
MODULE_DESCRIPTION("MAX17040 Fuel Gauge");
MODULE_LICENSE("GPL");
|
