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
|
/*
* BQ27xxx battery monitor I2C driver
*
* Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com/
* Andrew F. Davis <afd@ti.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.
*
* This program is distributed "as is" WITHOUT ANY WARRANTY of any
* kind, whether express or implied; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <asm/unaligned.h>
#include <linux/power/bq27xxx_battery.h>
static DEFINE_IDR(battery_id);
static DEFINE_MUTEX(battery_mutex);
static irqreturn_t bq27xxx_battery_irq_handler_thread(int irq, void *data)
{
struct bq27xxx_device_info *di = data;
bq27xxx_battery_update(di);
return IRQ_HANDLED;
}
static int bq27xxx_battery_i2c_read(struct bq27xxx_device_info *di, u8 reg,
bool single)
{
struct i2c_client *client = to_i2c_client(di->dev);
struct i2c_msg msg[2];
u8 data[2];
int ret;
if (!client->adapter)
return -ENODEV;
msg[0].addr = client->addr;
msg[0].flags = 0;
msg[0].buf = ®
msg[0].len = sizeof(reg);
msg[1].addr = client->addr;
msg[1].flags = I2C_M_RD;
msg[1].buf = data;
if (single)
msg[1].len = 1;
else
msg[1].len = 2;
ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
if (ret < 0)
return ret;
if (!single)
ret = get_unaligned_le16(data);
else
ret = data[0];
return ret;
}
static int bq27xxx_battery_i2c_write(struct bq27xxx_device_info *di, u8 reg,
int value, bool single)
{
struct i2c_client *client = to_i2c_client(di->dev);
struct i2c_msg msg;
u8 data[4];
int ret;
if (!client->adapter)
return -ENODEV;
data[0] = reg;
if (single) {
data[1] = (u8) value;
msg.len = 2;
} else {
put_unaligned_le16(value, &data[1]);
msg.len = 3;
}
msg.buf = data;
msg.addr = client->addr;
msg.flags = 0;
ret = i2c_transfer(client->adapter, &msg, 1);
if (ret < 0)
return ret;
if (ret != 1)
return -EINVAL;
return 0;
}
static int bq27xxx_battery_i2c_bulk_read(struct bq27xxx_device_info *di, u8 reg,
u8 *data, int len)
{
struct i2c_client *client = to_i2c_client(di->dev);
int ret;
if (!client->adapter)
return -ENODEV;
ret = i2c_smbus_read_i2c_block_data(client, reg, len, data);
if (ret < 0)
return ret;
if (ret != len)
return -EINVAL;
return 0;
}
static int bq27xxx_battery_i2c_bulk_write(struct bq27xxx_device_info *di,
u8 reg, u8 *data, int len)
{
struct i2c_client *client = to_i2c_client(di->dev);
struct i2c_msg msg;
u8 buf[33];
int ret;
if (!client->adapter)
return -ENODEV;
buf[0] = reg;
memcpy(&buf[1], data, len);
msg.buf = buf;
msg.addr = client->addr;
msg.flags = 0;
msg.len = len + 1;
ret = i2c_transfer(client->adapter, &msg, 1);
if (ret < 0)
return ret;
if (ret != 1)
return -EINVAL;
return 0;
}
static int bq27xxx_battery_i2c_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct bq27xxx_device_info *di;
int ret;
char *name;
int num;
/* Get new ID for the new battery device */
mutex_lock(&battery_mutex);
num = idr_alloc(&battery_id, client, 0, 0, GFP_KERNEL);
mutex_unlock(&battery_mutex);
if (num < 0)
return num;
name = devm_kasprintf(&client->dev, GFP_KERNEL, "%s-%d", id->name, num);
if (!name)
goto err_mem;
di = devm_kzalloc(&client->dev, sizeof(*di), GFP_KERNEL);
if (!di)
goto err_mem;
di->id = num;
di->dev = &client->dev;
di->chip = id->driver_data;
di->name = name;
di->bus.read = bq27xxx_battery_i2c_read;
di->bus.write = bq27xxx_battery_i2c_write;
di->bus.read_bulk = bq27xxx_battery_i2c_bulk_read;
di->bus.write_bulk = bq27xxx_battery_i2c_bulk_write;
ret = bq27xxx_battery_setup(di);
if (ret)
goto err_failed;
/* Schedule a polling after about 1 min */
schedule_delayed_work(&di->work, 60 * HZ);
i2c_set_clientdata(client, di);
if (client->irq) {
ret = devm_request_threaded_irq(&client->dev, client->irq,
NULL, bq27xxx_battery_irq_handler_thread,
IRQF_ONESHOT,
di->name, di);
if (ret) {
dev_err(&client->dev,
"Unable to register IRQ %d error %d\n",
client->irq, ret);
return ret;
}
}
return 0;
err_mem:
ret = -ENOMEM;
err_failed:
mutex_lock(&battery_mutex);
idr_remove(&battery_id, num);
mutex_unlock(&battery_mutex);
return ret;
}
static int bq27xxx_battery_i2c_remove(struct i2c_client *client)
{
struct bq27xxx_device_info *di = i2c_get_clientdata(client);
bq27xxx_battery_teardown(di);
mutex_lock(&battery_mutex);
idr_remove(&battery_id, di->id);
mutex_unlock(&battery_mutex);
return 0;
}
static const struct i2c_device_id bq27xxx_i2c_id_table[] = {
{ "bq27200", BQ27000 },
{ "bq27210", BQ27010 },
{ "bq27500", BQ2750X },
{ "bq27510", BQ2751X },
{ "bq27520", BQ2752X },
{ "bq27500-1", BQ27500 },
{ "bq27510g1", BQ27510G1 },
{ "bq27510g2", BQ27510G2 },
{ "bq27510g3", BQ27510G3 },
{ "bq27520g1", BQ27520G1 },
{ "bq27520g2", BQ27520G2 },
{ "bq27520g3", BQ27520G3 },
{ "bq27520g4", BQ27520G4 },
{ "bq27521", BQ27521 },
{ "bq27530", BQ27530 },
{ "bq27531", BQ27531 },
{ "bq27541", BQ27541 },
{ "bq27542", BQ27542 },
{ "bq27546", BQ27546 },
{ "bq27742", BQ27742 },
{ "bq27545", BQ27545 },
{ "bq27421", BQ27421 },
{ "bq27425", BQ27425 },
{ "bq27426", BQ27426 },
{ "bq27441", BQ27441 },
{ "bq27621", BQ27621 },
{},
};
MODULE_DEVICE_TABLE(i2c, bq27xxx_i2c_id_table);
#ifdef CONFIG_OF
static const struct of_device_id bq27xxx_battery_i2c_of_match_table[] = {
{ .compatible = "ti,bq27200" },
{ .compatible = "ti,bq27210" },
{ .compatible = "ti,bq27500" },
{ .compatible = "ti,bq27510" },
{ .compatible = "ti,bq27520" },
{ .compatible = "ti,bq27500-1" },
{ .compatible = "ti,bq27510g1" },
{ .compatible = "ti,bq27510g2" },
{ .compatible = "ti,bq27510g3" },
{ .compatible = "ti,bq27520g1" },
{ .compatible = "ti,bq27520g2" },
{ .compatible = "ti,bq27520g3" },
{ .compatible = "ti,bq27520g4" },
{ .compatible = "ti,bq27521" },
{ .compatible = "ti,bq27530" },
{ .compatible = "ti,bq27531" },
{ .compatible = "ti,bq27541" },
{ .compatible = "ti,bq27542" },
{ .compatible = "ti,bq27546" },
{ .compatible = "ti,bq27742" },
{ .compatible = "ti,bq27545" },
{ .compatible = "ti,bq27421" },
{ .compatible = "ti,bq27425" },
{ .compatible = "ti,bq27426" },
{ .compatible = "ti,bq27441" },
{ .compatible = "ti,bq27621" },
{},
};
MODULE_DEVICE_TABLE(of, bq27xxx_battery_i2c_of_match_table);
#endif
static struct i2c_driver bq27xxx_battery_i2c_driver = {
.driver = {
.name = "bq27xxx-battery",
.of_match_table = of_match_ptr(bq27xxx_battery_i2c_of_match_table),
},
.probe = bq27xxx_battery_i2c_probe,
.remove = bq27xxx_battery_i2c_remove,
.id_table = bq27xxx_i2c_id_table,
};
module_i2c_driver(bq27xxx_battery_i2c_driver);
MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
MODULE_DESCRIPTION("BQ27xxx battery monitor i2c driver");
MODULE_LICENSE("GPL");
|
