1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * BQ27xxx battery monitor I2C driver
4 *
5 * Copyright (C) 2015 Texas Instruments Incorporated - https://www.ti.com/
6 * Andrew F. Davis <afd@ti.com>
7 */
8
9 #include <linux/i2c.h>
10 #include <linux/interrupt.h>
11 #include <linux/module.h>
12 #include <asm/unaligned.h>
13
14 #include <linux/power/bq27xxx_battery.h>
15
16 static DEFINE_IDR(battery_id);
17 static DEFINE_MUTEX(battery_mutex);
18
bq27xxx_battery_irq_handler_thread(int irq,void * data)19 static irqreturn_t bq27xxx_battery_irq_handler_thread(int irq, void *data)
20 {
21 struct bq27xxx_device_info *di = data;
22
23 bq27xxx_battery_update(di);
24
25 return IRQ_HANDLED;
26 }
27
bq27xxx_battery_i2c_read(struct bq27xxx_device_info * di,u8 reg,bool single)28 static int bq27xxx_battery_i2c_read(struct bq27xxx_device_info *di, u8 reg,
29 bool single)
30 {
31 struct i2c_client *client = to_i2c_client(di->dev);
32 struct i2c_msg msg[2];
33 u8 data[2];
34 int ret;
35
36 if (!client->adapter)
37 return -ENODEV;
38
39 msg[0].addr = client->addr;
40 msg[0].flags = 0;
41 msg[0].buf = ®
42 msg[0].len = sizeof(reg);
43 msg[1].addr = client->addr;
44 msg[1].flags = I2C_M_RD;
45 msg[1].buf = data;
46 if (single)
47 msg[1].len = 1;
48 else
49 msg[1].len = 2;
50
51 ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
52 if (ret < 0)
53 return ret;
54
55 if (!single)
56 ret = get_unaligned_le16(data);
57 else
58 ret = data[0];
59
60 return ret;
61 }
62
bq27xxx_battery_i2c_write(struct bq27xxx_device_info * di,u8 reg,int value,bool single)63 static int bq27xxx_battery_i2c_write(struct bq27xxx_device_info *di, u8 reg,
64 int value, bool single)
65 {
66 struct i2c_client *client = to_i2c_client(di->dev);
67 struct i2c_msg msg;
68 u8 data[4];
69 int ret;
70
71 if (!client->adapter)
72 return -ENODEV;
73
74 data[0] = reg;
75 if (single) {
76 data[1] = (u8) value;
77 msg.len = 2;
78 } else {
79 put_unaligned_le16(value, &data[1]);
80 msg.len = 3;
81 }
82
83 msg.buf = data;
84 msg.addr = client->addr;
85 msg.flags = 0;
86
87 ret = i2c_transfer(client->adapter, &msg, 1);
88 if (ret < 0)
89 return ret;
90 if (ret != 1)
91 return -EINVAL;
92 return 0;
93 }
94
bq27xxx_battery_i2c_bulk_read(struct bq27xxx_device_info * di,u8 reg,u8 * data,int len)95 static int bq27xxx_battery_i2c_bulk_read(struct bq27xxx_device_info *di, u8 reg,
96 u8 *data, int len)
97 {
98 struct i2c_client *client = to_i2c_client(di->dev);
99 int ret;
100
101 if (!client->adapter)
102 return -ENODEV;
103
104 ret = i2c_smbus_read_i2c_block_data(client, reg, len, data);
105 if (ret < 0)
106 return ret;
107 if (ret != len)
108 return -EINVAL;
109 return 0;
110 }
111
bq27xxx_battery_i2c_bulk_write(struct bq27xxx_device_info * di,u8 reg,u8 * data,int len)112 static int bq27xxx_battery_i2c_bulk_write(struct bq27xxx_device_info *di,
113 u8 reg, u8 *data, int len)
114 {
115 struct i2c_client *client = to_i2c_client(di->dev);
116 struct i2c_msg msg;
117 u8 buf[33];
118 int ret;
119
120 if (!client->adapter)
121 return -ENODEV;
122
123 buf[0] = reg;
124 memcpy(&buf[1], data, len);
125
126 msg.buf = buf;
127 msg.addr = client->addr;
128 msg.flags = 0;
129 msg.len = len + 1;
130
131 ret = i2c_transfer(client->adapter, &msg, 1);
132 if (ret < 0)
133 return ret;
134 if (ret != 1)
135 return -EINVAL;
136 return 0;
137 }
138
bq27xxx_battery_i2c_probe(struct i2c_client * client,const struct i2c_device_id * id)139 static int bq27xxx_battery_i2c_probe(struct i2c_client *client,
140 const struct i2c_device_id *id)
141 {
142 struct bq27xxx_device_info *di;
143 int ret;
144 char *name;
145 int num;
146
147 /* Get new ID for the new battery device */
148 mutex_lock(&battery_mutex);
149 num = idr_alloc(&battery_id, client, 0, 0, GFP_KERNEL);
150 mutex_unlock(&battery_mutex);
151 if (num < 0)
152 return num;
153
154 name = devm_kasprintf(&client->dev, GFP_KERNEL, "%s-%d", id->name, num);
155 if (!name)
156 goto err_mem;
157
158 di = devm_kzalloc(&client->dev, sizeof(*di), GFP_KERNEL);
159 if (!di)
160 goto err_mem;
161
162 di->id = num;
163 di->dev = &client->dev;
164 di->chip = id->driver_data;
165 di->name = name;
166
167 di->bus.read = bq27xxx_battery_i2c_read;
168 di->bus.write = bq27xxx_battery_i2c_write;
169 di->bus.read_bulk = bq27xxx_battery_i2c_bulk_read;
170 di->bus.write_bulk = bq27xxx_battery_i2c_bulk_write;
171
172 ret = bq27xxx_battery_setup(di);
173 if (ret)
174 goto err_failed;
175
176 /* Schedule a polling after about 1 min */
177 schedule_delayed_work(&di->work, 60 * HZ);
178
179 i2c_set_clientdata(client, di);
180
181 if (client->irq) {
182 ret = devm_request_threaded_irq(&client->dev, client->irq,
183 NULL, bq27xxx_battery_irq_handler_thread,
184 IRQF_ONESHOT,
185 di->name, di);
186 if (ret) {
187 dev_err(&client->dev,
188 "Unable to register IRQ %d error %d\n",
189 client->irq, ret);
190 return ret;
191 }
192 }
193
194 return 0;
195
196 err_mem:
197 ret = -ENOMEM;
198
199 err_failed:
200 mutex_lock(&battery_mutex);
201 idr_remove(&battery_id, num);
202 mutex_unlock(&battery_mutex);
203
204 return ret;
205 }
206
bq27xxx_battery_i2c_remove(struct i2c_client * client)207 static int bq27xxx_battery_i2c_remove(struct i2c_client *client)
208 {
209 struct bq27xxx_device_info *di = i2c_get_clientdata(client);
210
211 bq27xxx_battery_teardown(di);
212
213 mutex_lock(&battery_mutex);
214 idr_remove(&battery_id, di->id);
215 mutex_unlock(&battery_mutex);
216
217 return 0;
218 }
219
220 static const struct i2c_device_id bq27xxx_i2c_id_table[] = {
221 { "bq27200", BQ27000 },
222 { "bq27210", BQ27010 },
223 { "bq27500", BQ2750X },
224 { "bq27510", BQ2751X },
225 { "bq27520", BQ2752X },
226 { "bq27500-1", BQ27500 },
227 { "bq27510g1", BQ27510G1 },
228 { "bq27510g2", BQ27510G2 },
229 { "bq27510g3", BQ27510G3 },
230 { "bq27520g1", BQ27520G1 },
231 { "bq27520g2", BQ27520G2 },
232 { "bq27520g3", BQ27520G3 },
233 { "bq27520g4", BQ27520G4 },
234 { "bq27521", BQ27521 },
235 { "bq27530", BQ27530 },
236 { "bq27531", BQ27531 },
237 { "bq27541", BQ27541 },
238 { "bq27542", BQ27542 },
239 { "bq27546", BQ27546 },
240 { "bq27742", BQ27742 },
241 { "bq27545", BQ27545 },
242 { "bq27411", BQ27411 },
243 { "bq27421", BQ27421 },
244 { "bq27425", BQ27425 },
245 { "bq27426", BQ27426 },
246 { "bq27441", BQ27441 },
247 { "bq27621", BQ27621 },
248 { "bq27z561", BQ27Z561 },
249 { "bq28z610", BQ28Z610 },
250 { "bq34z100", BQ34Z100 },
251 { "bq78z100", BQ78Z100 },
252 {},
253 };
254 MODULE_DEVICE_TABLE(i2c, bq27xxx_i2c_id_table);
255
256 #ifdef CONFIG_OF
257 static const struct of_device_id bq27xxx_battery_i2c_of_match_table[] = {
258 { .compatible = "ti,bq27200" },
259 { .compatible = "ti,bq27210" },
260 { .compatible = "ti,bq27500" },
261 { .compatible = "ti,bq27510" },
262 { .compatible = "ti,bq27520" },
263 { .compatible = "ti,bq27500-1" },
264 { .compatible = "ti,bq27510g1" },
265 { .compatible = "ti,bq27510g2" },
266 { .compatible = "ti,bq27510g3" },
267 { .compatible = "ti,bq27520g1" },
268 { .compatible = "ti,bq27520g2" },
269 { .compatible = "ti,bq27520g3" },
270 { .compatible = "ti,bq27520g4" },
271 { .compatible = "ti,bq27521" },
272 { .compatible = "ti,bq27530" },
273 { .compatible = "ti,bq27531" },
274 { .compatible = "ti,bq27541" },
275 { .compatible = "ti,bq27542" },
276 { .compatible = "ti,bq27546" },
277 { .compatible = "ti,bq27742" },
278 { .compatible = "ti,bq27545" },
279 { .compatible = "ti,bq27411" },
280 { .compatible = "ti,bq27421" },
281 { .compatible = "ti,bq27425" },
282 { .compatible = "ti,bq27426" },
283 { .compatible = "ti,bq27441" },
284 { .compatible = "ti,bq27621" },
285 { .compatible = "ti,bq27z561" },
286 { .compatible = "ti,bq28z610" },
287 { .compatible = "ti,bq34z100" },
288 { .compatible = "ti,bq78z100" },
289 {},
290 };
291 MODULE_DEVICE_TABLE(of, bq27xxx_battery_i2c_of_match_table);
292 #endif
293
294 static struct i2c_driver bq27xxx_battery_i2c_driver = {
295 .driver = {
296 .name = "bq27xxx-battery",
297 .of_match_table = of_match_ptr(bq27xxx_battery_i2c_of_match_table),
298 },
299 .probe = bq27xxx_battery_i2c_probe,
300 .remove = bq27xxx_battery_i2c_remove,
301 .id_table = bq27xxx_i2c_id_table,
302 };
303 module_i2c_driver(bq27xxx_battery_i2c_driver);
304
305 MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
306 MODULE_DESCRIPTION("BQ27xxx battery monitor i2c driver");
307 MODULE_LICENSE("GPL");
308