This source file includes following definitions.
- show_temp
- w83l785ts_detect
- w83l785ts_probe
- w83l785ts_remove
- w83l785ts_read_value
- w83l785ts_update_device
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20 #include <linux/module.h>
21 #include <linux/delay.h>
22 #include <linux/init.h>
23 #include <linux/slab.h>
24 #include <linux/jiffies.h>
25 #include <linux/i2c.h>
26 #include <linux/hwmon.h>
27 #include <linux/hwmon-sysfs.h>
28 #include <linux/err.h>
29 #include <linux/mutex.h>
30
31
32 #define MAX_RETRIES 5
33
34
35
36
37
38
39 static const unsigned short normal_i2c[] = { 0x2e, I2C_CLIENT_END };
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44
45
46 #define W83L785TS_REG_MAN_ID1 0x4D
47 #define W83L785TS_REG_MAN_ID2 0x4C
48 #define W83L785TS_REG_CHIP_ID 0x4E
49 #define W83L785TS_REG_CONFIG 0x40
50 #define W83L785TS_REG_TYPE 0x52
51 #define W83L785TS_REG_TEMP 0x27
52 #define W83L785TS_REG_TEMP_OVER 0x53
53
54
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57
58
59 #define TEMP_FROM_REG(val) ((val) * 1000)
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64
65 static int w83l785ts_probe(struct i2c_client *client,
66 const struct i2c_device_id *id);
67 static int w83l785ts_detect(struct i2c_client *client,
68 struct i2c_board_info *info);
69 static int w83l785ts_remove(struct i2c_client *client);
70 static u8 w83l785ts_read_value(struct i2c_client *client, u8 reg, u8 defval);
71 static struct w83l785ts_data *w83l785ts_update_device(struct device *dev);
72
73
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75
76
77 static const struct i2c_device_id w83l785ts_id[] = {
78 { "w83l785ts", 0 },
79 { }
80 };
81 MODULE_DEVICE_TABLE(i2c, w83l785ts_id);
82
83 static struct i2c_driver w83l785ts_driver = {
84 .class = I2C_CLASS_HWMON,
85 .driver = {
86 .name = "w83l785ts",
87 },
88 .probe = w83l785ts_probe,
89 .remove = w83l785ts_remove,
90 .id_table = w83l785ts_id,
91 .detect = w83l785ts_detect,
92 .address_list = normal_i2c,
93 };
94
95
96
97
98
99 struct w83l785ts_data {
100 struct device *hwmon_dev;
101 struct mutex update_lock;
102 char valid;
103 unsigned long last_updated;
104
105
106 s8 temp[2];
107 };
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109
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111
112
113 static ssize_t show_temp(struct device *dev, struct device_attribute *devattr,
114 char *buf)
115 {
116 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
117 struct w83l785ts_data *data = w83l785ts_update_device(dev);
118 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[attr->index]));
119 }
120
121 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
122 static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_temp, NULL, 1);
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124
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127
128
129 static int w83l785ts_detect(struct i2c_client *client,
130 struct i2c_board_info *info)
131 {
132 struct i2c_adapter *adapter = client->adapter;
133 u16 man_id;
134 u8 chip_id;
135
136 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
137 return -ENODEV;
138
139
140 if ((w83l785ts_read_value(client, W83L785TS_REG_CONFIG, 0) & 0x80)
141 || (w83l785ts_read_value(client, W83L785TS_REG_TYPE, 0) & 0xFC)) {
142 dev_dbg(&adapter->dev,
143 "W83L785TS-S detection failed at 0x%02x\n",
144 client->addr);
145 return -ENODEV;
146 }
147
148
149 man_id = (w83l785ts_read_value(client, W83L785TS_REG_MAN_ID1, 0) << 8)
150 + w83l785ts_read_value(client, W83L785TS_REG_MAN_ID2, 0);
151 chip_id = w83l785ts_read_value(client, W83L785TS_REG_CHIP_ID, 0);
152
153 if (man_id != 0x5CA3
154 || chip_id != 0x70) {
155 dev_dbg(&adapter->dev,
156 "Unsupported chip (man_id=0x%04X, chip_id=0x%02X)\n",
157 man_id, chip_id);
158 return -ENODEV;
159 }
160
161 strlcpy(info->type, "w83l785ts", I2C_NAME_SIZE);
162
163 return 0;
164 }
165
166 static int w83l785ts_probe(struct i2c_client *client,
167 const struct i2c_device_id *id)
168 {
169 struct w83l785ts_data *data;
170 struct device *dev = &client->dev;
171 int err;
172
173 data = devm_kzalloc(dev, sizeof(struct w83l785ts_data), GFP_KERNEL);
174 if (!data)
175 return -ENOMEM;
176
177 i2c_set_clientdata(client, data);
178 mutex_init(&data->update_lock);
179
180
181
182
183
184
185 err = device_create_file(dev, &sensor_dev_attr_temp1_input.dev_attr);
186 if (err)
187 return err;
188
189 err = device_create_file(dev, &sensor_dev_attr_temp1_max.dev_attr);
190 if (err)
191 goto exit_remove;
192
193
194 data->hwmon_dev = hwmon_device_register(dev);
195 if (IS_ERR(data->hwmon_dev)) {
196 err = PTR_ERR(data->hwmon_dev);
197 goto exit_remove;
198 }
199
200 return 0;
201
202 exit_remove:
203 device_remove_file(dev, &sensor_dev_attr_temp1_input.dev_attr);
204 device_remove_file(dev, &sensor_dev_attr_temp1_max.dev_attr);
205 return err;
206 }
207
208 static int w83l785ts_remove(struct i2c_client *client)
209 {
210 struct w83l785ts_data *data = i2c_get_clientdata(client);
211
212 hwmon_device_unregister(data->hwmon_dev);
213 device_remove_file(&client->dev,
214 &sensor_dev_attr_temp1_input.dev_attr);
215 device_remove_file(&client->dev,
216 &sensor_dev_attr_temp1_max.dev_attr);
217
218 return 0;
219 }
220
221 static u8 w83l785ts_read_value(struct i2c_client *client, u8 reg, u8 defval)
222 {
223 int value, i;
224 struct device *dev;
225 const char *prefix;
226
227
228
229
230
231 if (i2c_get_clientdata(client)) {
232 dev = &client->dev;
233 prefix = "";
234 } else {
235 dev = &client->adapter->dev;
236 prefix = "w83l785ts: ";
237 }
238
239
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241
242
243
244 for (i = 1; i <= MAX_RETRIES; i++) {
245 value = i2c_smbus_read_byte_data(client, reg);
246 if (value >= 0) {
247 dev_dbg(dev, "%sRead 0x%02x from register 0x%02x.\n",
248 prefix, value, reg);
249 return value;
250 }
251 dev_dbg(dev, "%sRead failed, will retry in %d.\n", prefix, i);
252 msleep(i);
253 }
254
255 dev_err(dev, "%sCouldn't read value from register 0x%02x.\n", prefix,
256 reg);
257 return defval;
258 }
259
260 static struct w83l785ts_data *w83l785ts_update_device(struct device *dev)
261 {
262 struct i2c_client *client = to_i2c_client(dev);
263 struct w83l785ts_data *data = i2c_get_clientdata(client);
264
265 mutex_lock(&data->update_lock);
266
267 if (!data->valid || time_after(jiffies, data->last_updated + HZ * 2)) {
268 dev_dbg(&client->dev, "Updating w83l785ts data.\n");
269 data->temp[0] = w83l785ts_read_value(client,
270 W83L785TS_REG_TEMP, data->temp[0]);
271 data->temp[1] = w83l785ts_read_value(client,
272 W83L785TS_REG_TEMP_OVER, data->temp[1]);
273
274 data->last_updated = jiffies;
275 data->valid = 1;
276 }
277
278 mutex_unlock(&data->update_lock);
279
280 return data;
281 }
282
283 module_i2c_driver(w83l785ts_driver);
284
285 MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>");
286 MODULE_DESCRIPTION("W83L785TS-S driver");
287 MODULE_LICENSE("GPL");