1 /*
2 * BQ27xxx battery monitor I2C driver
3 *
4 * Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com/
5 * Andrew F. Davis <afd@ti.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
12 * kind, whether express or implied; without even the implied warranty
13 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 */
16
17 #include <linux/i2c.h>
18 #include <linux/interrupt.h>
19 #include <linux/module.h>
20 #include <asm/unaligned.h>
21
22 #include <linux/power/bq27xxx_battery.h>
23
24 static DEFINE_IDR(battery_id);
25 static DEFINE_MUTEX(battery_mutex);
26
bq27xxx_battery_irq_handler_thread(int irq,void * data)27 static irqreturn_t bq27xxx_battery_irq_handler_thread(int irq, void *data)
28 {
29 struct bq27xxx_device_info *di = data;
30
31 bq27xxx_battery_update(di);
32
33 return IRQ_HANDLED;
34 }
35
bq27xxx_battery_i2c_read(struct bq27xxx_device_info * di,u8 reg,bool single)36 static int bq27xxx_battery_i2c_read(struct bq27xxx_device_info *di, u8 reg,
37 bool single)
38 {
39 struct i2c_client *client = to_i2c_client(di->dev);
40 struct i2c_msg msg[2];
41 u8 data[2];
42 int ret;
43
44 if (!client->adapter)
45 return -ENODEV;
46
47 msg[0].addr = client->addr;
48 msg[0].flags = 0;
49 msg[0].buf = ®
50 msg[0].len = sizeof(reg);
51 msg[1].addr = client->addr;
52 msg[1].flags = I2C_M_RD;
53 msg[1].buf = data;
54 if (single)
55 msg[1].len = 1;
56 else
57 msg[1].len = 2;
58
59 ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
60 if (ret < 0)
61 return ret;
62
63 if (!single)
64 ret = get_unaligned_le16(data);
65 else
66 ret = data[0];
67
68 return ret;
69 }
70
bq27xxx_battery_i2c_write(struct bq27xxx_device_info * di,u8 reg,int value,bool single)71 static int bq27xxx_battery_i2c_write(struct bq27xxx_device_info *di, u8 reg,
72 int value, bool single)
73 {
74 struct i2c_client *client = to_i2c_client(di->dev);
75 struct i2c_msg msg;
76 u8 data[4];
77 int ret;
78
79 if (!client->adapter)
80 return -ENODEV;
81
82 data[0] = reg;
83 if (single) {
84 data[1] = (u8) value;
85 msg.len = 2;
86 } else {
87 put_unaligned_le16(value, &data[1]);
88 msg.len = 3;
89 }
90
91 msg.buf = data;
92 msg.addr = client->addr;
93 msg.flags = 0;
94
95 ret = i2c_transfer(client->adapter, &msg, 1);
96 if (ret < 0)
97 return ret;
98 if (ret != 1)
99 return -EINVAL;
100 return 0;
101 }
102
bq27xxx_battery_i2c_bulk_read(struct bq27xxx_device_info * di,u8 reg,u8 * data,int len)103 static int bq27xxx_battery_i2c_bulk_read(struct bq27xxx_device_info *di, u8 reg,
104 u8 *data, int len)
105 {
106 struct i2c_client *client = to_i2c_client(di->dev);
107 int ret;
108
109 if (!client->adapter)
110 return -ENODEV;
111
112 ret = i2c_smbus_read_i2c_block_data(client, reg, len, data);
113 if (ret < 0)
114 return ret;
115 if (ret != len)
116 return -EINVAL;
117 return 0;
118 }
119
bq27xxx_battery_i2c_bulk_write(struct bq27xxx_device_info * di,u8 reg,u8 * data,int len)120 static int bq27xxx_battery_i2c_bulk_write(struct bq27xxx_device_info *di,
121 u8 reg, u8 *data, int len)
122 {
123 struct i2c_client *client = to_i2c_client(di->dev);
124 struct i2c_msg msg;
125 u8 buf[33];
126 int ret;
127
128 if (!client->adapter)
129 return -ENODEV;
130
131 buf[0] = reg;
132 memcpy(&buf[1], data, len);
133
134 msg.buf = buf;
135 msg.addr = client->addr;
136 msg.flags = 0;
137 msg.len = len + 1;
138
139 ret = i2c_transfer(client->adapter, &msg, 1);
140 if (ret < 0)
141 return ret;
142 if (ret != 1)
143 return -EINVAL;
144 return 0;
145 }
146
bq27xxx_battery_i2c_probe(struct i2c_client * client,const struct i2c_device_id * id)147 static int bq27xxx_battery_i2c_probe(struct i2c_client *client,
148 const struct i2c_device_id *id)
149 {
150 struct bq27xxx_device_info *di;
151 int ret;
152 char *name;
153 int num;
154
155 /* Get new ID for the new battery device */
156 mutex_lock(&battery_mutex);
157 num = idr_alloc(&battery_id, client, 0, 0, GFP_KERNEL);
158 mutex_unlock(&battery_mutex);
159 if (num < 0)
160 return num;
161
162 name = devm_kasprintf(&client->dev, GFP_KERNEL, "%s-%d", id->name, num);
163 if (!name)
164 goto err_mem;
165
166 di = devm_kzalloc(&client->dev, sizeof(*di), GFP_KERNEL);
167 if (!di)
168 goto err_mem;
169
170 di->id = num;
171 di->dev = &client->dev;
172 di->chip = id->driver_data;
173 di->name = name;
174
175 di->bus.read = bq27xxx_battery_i2c_read;
176 di->bus.write = bq27xxx_battery_i2c_write;
177 di->bus.read_bulk = bq27xxx_battery_i2c_bulk_read;
178 di->bus.write_bulk = bq27xxx_battery_i2c_bulk_write;
179
180 ret = bq27xxx_battery_setup(di);
181 if (ret)
182 goto err_failed;
183
184 /* Schedule a polling after about 1 min */
185 schedule_delayed_work(&di->work, 60 * HZ);
186
187 i2c_set_clientdata(client, di);
188
189 if (client->irq) {
190 ret = devm_request_threaded_irq(&client->dev, client->irq,
191 NULL, bq27xxx_battery_irq_handler_thread,
192 IRQF_ONESHOT,
193 di->name, di);
194 if (ret) {
195 dev_err(&client->dev,
196 "Unable to register IRQ %d error %d\n",
197 client->irq, ret);
198 return ret;
199 }
200 }
201
202 return 0;
203
204 err_mem:
205 ret = -ENOMEM;
206
207 err_failed:
208 mutex_lock(&battery_mutex);
209 idr_remove(&battery_id, num);
210 mutex_unlock(&battery_mutex);
211
212 return ret;
213 }
214
bq27xxx_battery_i2c_remove(struct i2c_client * client)215 static int bq27xxx_battery_i2c_remove(struct i2c_client *client)
216 {
217 struct bq27xxx_device_info *di = i2c_get_clientdata(client);
218
219 bq27xxx_battery_teardown(di);
220
221 mutex_lock(&battery_mutex);
222 idr_remove(&battery_id, di->id);
223 mutex_unlock(&battery_mutex);
224
225 return 0;
226 }
227
228 static const struct i2c_device_id bq27xxx_i2c_id_table[] = {
229 { "bq27200", BQ27000 },
230 { "bq27210", BQ27010 },
231 { "bq27500", BQ2750X },
232 { "bq27510", BQ2751X },
233 { "bq27520", BQ2752X },
234 { "bq27500-1", BQ27500 },
235 { "bq27510g1", BQ27510G1 },
236 { "bq27510g2", BQ27510G2 },
237 { "bq27510g3", BQ27510G3 },
238 { "bq27520g1", BQ27520G1 },
239 { "bq27520g2", BQ27520G2 },
240 { "bq27520g3", BQ27520G3 },
241 { "bq27520g4", BQ27520G4 },
242 { "bq27521", BQ27521 },
243 { "bq27530", BQ27530 },
244 { "bq27531", BQ27531 },
245 { "bq27541", BQ27541 },
246 { "bq27542", BQ27542 },
247 { "bq27546", BQ27546 },
248 { "bq27742", BQ27742 },
249 { "bq27545", BQ27545 },
250 { "bq27421", BQ27421 },
251 { "bq27425", BQ27425 },
252 { "bq27426", BQ27426 },
253 { "bq27441", BQ27441 },
254 { "bq27621", BQ27621 },
255 {},
256 };
257 MODULE_DEVICE_TABLE(i2c, bq27xxx_i2c_id_table);
258
259 #ifdef CONFIG_OF
260 static const struct of_device_id bq27xxx_battery_i2c_of_match_table[] = {
261 { .compatible = "ti,bq27200" },
262 { .compatible = "ti,bq27210" },
263 { .compatible = "ti,bq27500" },
264 { .compatible = "ti,bq27510" },
265 { .compatible = "ti,bq27520" },
266 { .compatible = "ti,bq27500-1" },
267 { .compatible = "ti,bq27510g1" },
268 { .compatible = "ti,bq27510g2" },
269 { .compatible = "ti,bq27510g3" },
270 { .compatible = "ti,bq27520g1" },
271 { .compatible = "ti,bq27520g2" },
272 { .compatible = "ti,bq27520g3" },
273 { .compatible = "ti,bq27520g4" },
274 { .compatible = "ti,bq27521" },
275 { .compatible = "ti,bq27530" },
276 { .compatible = "ti,bq27531" },
277 { .compatible = "ti,bq27541" },
278 { .compatible = "ti,bq27542" },
279 { .compatible = "ti,bq27546" },
280 { .compatible = "ti,bq27742" },
281 { .compatible = "ti,bq27545" },
282 { .compatible = "ti,bq27421" },
283 { .compatible = "ti,bq27425" },
284 { .compatible = "ti,bq27426" },
285 { .compatible = "ti,bq27441" },
286 { .compatible = "ti,bq27621" },
287 {},
288 };
289 MODULE_DEVICE_TABLE(of, bq27xxx_battery_i2c_of_match_table);
290 #endif
291
292 static struct i2c_driver bq27xxx_battery_i2c_driver = {
293 .driver = {
294 .name = "bq27xxx-battery",
295 .of_match_table = of_match_ptr(bq27xxx_battery_i2c_of_match_table),
296 },
297 .probe = bq27xxx_battery_i2c_probe,
298 .remove = bq27xxx_battery_i2c_remove,
299 .id_table = bq27xxx_i2c_id_table,
300 };
301 module_i2c_driver(bq27xxx_battery_i2c_driver);
302
303 MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
304 MODULE_DESCRIPTION("BQ27xxx battery monitor i2c driver");
305 MODULE_LICENSE("GPL");
306
