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74ba9207 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
b0b349a8 JD |
2 | /* |
3 | * emc6w201.c - Hardware monitoring driver for the SMSC EMC6W201 | |
7c81c60f | 4 | * Copyright (C) 2011 Jean Delvare <jdelvare@suse.de> |
b0b349a8 JD |
5 | */ |
6 | ||
7 | #include <linux/module.h> | |
b0b349a8 JD |
8 | #include <linux/init.h> |
9 | #include <linux/slab.h> | |
10 | #include <linux/jiffies.h> | |
11 | #include <linux/i2c.h> | |
12 | #include <linux/hwmon.h> | |
13 | #include <linux/hwmon-sysfs.h> | |
14 | #include <linux/err.h> | |
15 | #include <linux/mutex.h> | |
16 | ||
17 | /* | |
18 | * Addresses to scan | |
19 | */ | |
20 | ||
21 | static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END }; | |
22 | ||
23 | /* | |
24 | * The EMC6W201 registers | |
25 | */ | |
26 | ||
27 | #define EMC6W201_REG_IN(nr) (0x20 + (nr)) | |
28 | #define EMC6W201_REG_TEMP(nr) (0x26 + (nr)) | |
29 | #define EMC6W201_REG_FAN(nr) (0x2C + (nr) * 2) | |
30 | #define EMC6W201_REG_COMPANY 0x3E | |
31 | #define EMC6W201_REG_VERSTEP 0x3F | |
32 | #define EMC6W201_REG_CONFIG 0x40 | |
33 | #define EMC6W201_REG_IN_LOW(nr) (0x4A + (nr) * 2) | |
34 | #define EMC6W201_REG_IN_HIGH(nr) (0x4B + (nr) * 2) | |
35 | #define EMC6W201_REG_TEMP_LOW(nr) (0x56 + (nr) * 2) | |
36 | #define EMC6W201_REG_TEMP_HIGH(nr) (0x57 + (nr) * 2) | |
37 | #define EMC6W201_REG_FAN_MIN(nr) (0x62 + (nr) * 2) | |
38 | ||
94e44413 | 39 | enum subfeature { input, min, max }; |
b0b349a8 JD |
40 | |
41 | /* | |
42 | * Per-device data | |
43 | */ | |
44 | ||
45 | struct emc6w201_data { | |
7b3dadc4 | 46 | struct i2c_client *client; |
b0b349a8 | 47 | struct mutex update_lock; |
952a11ca | 48 | bool valid; /* false until following fields are valid */ |
b0b349a8 JD |
49 | unsigned long last_updated; /* in jiffies */ |
50 | ||
51 | /* registers values */ | |
52 | u8 in[3][6]; | |
53 | s8 temp[3][6]; | |
54 | u16 fan[2][5]; | |
55 | }; | |
56 | ||
57 | /* | |
58 | * Combine LSB and MSB registers in a single value | |
59 | * Locking: must be called with data->update_lock held | |
60 | */ | |
61 | static u16 emc6w201_read16(struct i2c_client *client, u8 reg) | |
62 | { | |
63 | int lsb, msb; | |
64 | ||
65 | lsb = i2c_smbus_read_byte_data(client, reg); | |
66 | msb = i2c_smbus_read_byte_data(client, reg + 1); | |
b6b2a1e8 JD |
67 | if (unlikely(lsb < 0 || msb < 0)) { |
68 | dev_err(&client->dev, "%d-bit %s failed at 0x%02x\n", | |
69 | 16, "read", reg); | |
b0b349a8 JD |
70 | return 0xFFFF; /* Arbitrary value */ |
71 | } | |
72 | ||
73 | return (msb << 8) | lsb; | |
74 | } | |
75 | ||
76 | /* | |
77 | * Write 16-bit value to LSB and MSB registers | |
78 | * Locking: must be called with data->update_lock held | |
79 | */ | |
80 | static int emc6w201_write16(struct i2c_client *client, u8 reg, u16 val) | |
81 | { | |
82 | int err; | |
83 | ||
84 | err = i2c_smbus_write_byte_data(client, reg, val & 0xff); | |
b6b2a1e8 | 85 | if (likely(!err)) |
b0b349a8 | 86 | err = i2c_smbus_write_byte_data(client, reg + 1, val >> 8); |
b6b2a1e8 JD |
87 | if (unlikely(err < 0)) |
88 | dev_err(&client->dev, "%d-bit %s failed at 0x%02x\n", | |
89 | 16, "write", reg); | |
90 | ||
91 | return err; | |
92 | } | |
93 | ||
94 | /* Read 8-bit value from register */ | |
95 | static u8 emc6w201_read8(struct i2c_client *client, u8 reg) | |
96 | { | |
97 | int val; | |
98 | ||
99 | val = i2c_smbus_read_byte_data(client, reg); | |
100 | if (unlikely(val < 0)) { | |
101 | dev_err(&client->dev, "%d-bit %s failed at 0x%02x\n", | |
102 | 8, "read", reg); | |
103 | return 0x00; /* Arbitrary value */ | |
104 | } | |
105 | ||
106 | return val; | |
107 | } | |
108 | ||
109 | /* Write 8-bit value to register */ | |
110 | static int emc6w201_write8(struct i2c_client *client, u8 reg, u8 val) | |
111 | { | |
112 | int err; | |
113 | ||
114 | err = i2c_smbus_write_byte_data(client, reg, val); | |
115 | if (unlikely(err < 0)) | |
116 | dev_err(&client->dev, "%d-bit %s failed at 0x%02x\n", | |
117 | 8, "write", reg); | |
b0b349a8 JD |
118 | |
119 | return err; | |
120 | } | |
121 | ||
122 | static struct emc6w201_data *emc6w201_update_device(struct device *dev) | |
123 | { | |
7b3dadc4 AL |
124 | struct emc6w201_data *data = dev_get_drvdata(dev); |
125 | struct i2c_client *client = data->client; | |
b0b349a8 JD |
126 | int nr; |
127 | ||
128 | mutex_lock(&data->update_lock); | |
129 | ||
130 | if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { | |
131 | for (nr = 0; nr < 6; nr++) { | |
132 | data->in[input][nr] = | |
b6b2a1e8 | 133 | emc6w201_read8(client, |
b0b349a8 JD |
134 | EMC6W201_REG_IN(nr)); |
135 | data->in[min][nr] = | |
b6b2a1e8 | 136 | emc6w201_read8(client, |
b0b349a8 JD |
137 | EMC6W201_REG_IN_LOW(nr)); |
138 | data->in[max][nr] = | |
b6b2a1e8 | 139 | emc6w201_read8(client, |
b0b349a8 JD |
140 | EMC6W201_REG_IN_HIGH(nr)); |
141 | } | |
142 | ||
143 | for (nr = 0; nr < 6; nr++) { | |
144 | data->temp[input][nr] = | |
b6b2a1e8 | 145 | emc6w201_read8(client, |
b0b349a8 JD |
146 | EMC6W201_REG_TEMP(nr)); |
147 | data->temp[min][nr] = | |
b6b2a1e8 | 148 | emc6w201_read8(client, |
b0b349a8 JD |
149 | EMC6W201_REG_TEMP_LOW(nr)); |
150 | data->temp[max][nr] = | |
b6b2a1e8 | 151 | emc6w201_read8(client, |
b0b349a8 JD |
152 | EMC6W201_REG_TEMP_HIGH(nr)); |
153 | } | |
154 | ||
155 | for (nr = 0; nr < 5; nr++) { | |
156 | data->fan[input][nr] = | |
157 | emc6w201_read16(client, | |
158 | EMC6W201_REG_FAN(nr)); | |
159 | data->fan[min][nr] = | |
160 | emc6w201_read16(client, | |
161 | EMC6W201_REG_FAN_MIN(nr)); | |
162 | } | |
163 | ||
164 | data->last_updated = jiffies; | |
952a11ca | 165 | data->valid = true; |
b0b349a8 JD |
166 | } |
167 | ||
168 | mutex_unlock(&data->update_lock); | |
169 | ||
170 | return data; | |
171 | } | |
172 | ||
173 | /* | |
174 | * Sysfs callback functions | |
175 | */ | |
176 | ||
86266ca0 | 177 | static const s16 nominal_mv[6] = { 2500, 1500, 3300, 5000, 1500, 1500 }; |
b0b349a8 | 178 | |
7a61d719 GR |
179 | static ssize_t in_show(struct device *dev, struct device_attribute *devattr, |
180 | char *buf) | |
b0b349a8 JD |
181 | { |
182 | struct emc6w201_data *data = emc6w201_update_device(dev); | |
183 | int sf = to_sensor_dev_attr_2(devattr)->index; | |
184 | int nr = to_sensor_dev_attr_2(devattr)->nr; | |
185 | ||
186 | return sprintf(buf, "%u\n", | |
187 | (unsigned)data->in[sf][nr] * nominal_mv[nr] / 0xC0); | |
188 | } | |
189 | ||
7a61d719 GR |
190 | static ssize_t in_store(struct device *dev, struct device_attribute *devattr, |
191 | const char *buf, size_t count) | |
b0b349a8 | 192 | { |
7b3dadc4 AL |
193 | struct emc6w201_data *data = dev_get_drvdata(dev); |
194 | struct i2c_client *client = data->client; | |
b0b349a8 JD |
195 | int sf = to_sensor_dev_attr_2(devattr)->index; |
196 | int nr = to_sensor_dev_attr_2(devattr)->nr; | |
197 | int err; | |
198 | long val; | |
199 | u8 reg; | |
200 | ||
179c4fdb | 201 | err = kstrtol(buf, 10, &val); |
b0b349a8 JD |
202 | if (err < 0) |
203 | return err; | |
204 | ||
59715f4d GR |
205 | val = clamp_val(val, 0, 255 * nominal_mv[nr] / 192); |
206 | val = DIV_ROUND_CLOSEST(val * 192, nominal_mv[nr]); | |
b0b349a8 JD |
207 | reg = (sf == min) ? EMC6W201_REG_IN_LOW(nr) |
208 | : EMC6W201_REG_IN_HIGH(nr); | |
209 | ||
210 | mutex_lock(&data->update_lock); | |
59715f4d | 211 | data->in[sf][nr] = val; |
b6b2a1e8 | 212 | err = emc6w201_write8(client, reg, data->in[sf][nr]); |
b0b349a8 JD |
213 | mutex_unlock(&data->update_lock); |
214 | ||
215 | return err < 0 ? err : count; | |
216 | } | |
217 | ||
7a61d719 GR |
218 | static ssize_t temp_show(struct device *dev, struct device_attribute *devattr, |
219 | char *buf) | |
b0b349a8 JD |
220 | { |
221 | struct emc6w201_data *data = emc6w201_update_device(dev); | |
222 | int sf = to_sensor_dev_attr_2(devattr)->index; | |
223 | int nr = to_sensor_dev_attr_2(devattr)->nr; | |
224 | ||
225 | return sprintf(buf, "%d\n", (int)data->temp[sf][nr] * 1000); | |
226 | } | |
227 | ||
7a61d719 GR |
228 | static ssize_t temp_store(struct device *dev, |
229 | struct device_attribute *devattr, const char *buf, | |
230 | size_t count) | |
b0b349a8 | 231 | { |
7b3dadc4 AL |
232 | struct emc6w201_data *data = dev_get_drvdata(dev); |
233 | struct i2c_client *client = data->client; | |
b0b349a8 JD |
234 | int sf = to_sensor_dev_attr_2(devattr)->index; |
235 | int nr = to_sensor_dev_attr_2(devattr)->nr; | |
236 | int err; | |
237 | long val; | |
238 | u8 reg; | |
239 | ||
179c4fdb | 240 | err = kstrtol(buf, 10, &val); |
b0b349a8 JD |
241 | if (err < 0) |
242 | return err; | |
243 | ||
59715f4d | 244 | val = clamp_val(val, -127000, 127000); |
539a719f | 245 | val = DIV_ROUND_CLOSEST(val, 1000); |
b0b349a8 JD |
246 | reg = (sf == min) ? EMC6W201_REG_TEMP_LOW(nr) |
247 | : EMC6W201_REG_TEMP_HIGH(nr); | |
248 | ||
249 | mutex_lock(&data->update_lock); | |
59715f4d | 250 | data->temp[sf][nr] = val; |
b6b2a1e8 | 251 | err = emc6w201_write8(client, reg, data->temp[sf][nr]); |
b0b349a8 JD |
252 | mutex_unlock(&data->update_lock); |
253 | ||
254 | return err < 0 ? err : count; | |
255 | } | |
256 | ||
7a61d719 GR |
257 | static ssize_t fan_show(struct device *dev, struct device_attribute *devattr, |
258 | char *buf) | |
b0b349a8 JD |
259 | { |
260 | struct emc6w201_data *data = emc6w201_update_device(dev); | |
261 | int sf = to_sensor_dev_attr_2(devattr)->index; | |
262 | int nr = to_sensor_dev_attr_2(devattr)->nr; | |
263 | unsigned rpm; | |
264 | ||
265 | if (data->fan[sf][nr] == 0 || data->fan[sf][nr] == 0xFFFF) | |
266 | rpm = 0; | |
267 | else | |
268 | rpm = 5400000U / data->fan[sf][nr]; | |
269 | ||
270 | return sprintf(buf, "%u\n", rpm); | |
271 | } | |
272 | ||
7a61d719 GR |
273 | static ssize_t fan_store(struct device *dev, struct device_attribute *devattr, |
274 | const char *buf, size_t count) | |
b0b349a8 | 275 | { |
7b3dadc4 AL |
276 | struct emc6w201_data *data = dev_get_drvdata(dev); |
277 | struct i2c_client *client = data->client; | |
b0b349a8 JD |
278 | int sf = to_sensor_dev_attr_2(devattr)->index; |
279 | int nr = to_sensor_dev_attr_2(devattr)->nr; | |
280 | int err; | |
281 | unsigned long val; | |
282 | ||
179c4fdb | 283 | err = kstrtoul(buf, 10, &val); |
b0b349a8 JD |
284 | if (err < 0) |
285 | return err; | |
286 | ||
287 | if (val == 0) { | |
288 | val = 0xFFFF; | |
289 | } else { | |
290 | val = DIV_ROUND_CLOSEST(5400000U, val); | |
2a844c14 | 291 | val = clamp_val(val, 0, 0xFFFE); |
b0b349a8 JD |
292 | } |
293 | ||
294 | mutex_lock(&data->update_lock); | |
295 | data->fan[sf][nr] = val; | |
296 | err = emc6w201_write16(client, EMC6W201_REG_FAN_MIN(nr), | |
297 | data->fan[sf][nr]); | |
298 | mutex_unlock(&data->update_lock); | |
299 | ||
300 | return err < 0 ? err : count; | |
301 | } | |
302 | ||
7a61d719 GR |
303 | static SENSOR_DEVICE_ATTR_2_RO(in0_input, in, 0, input); |
304 | static SENSOR_DEVICE_ATTR_2_RW(in0_min, in, 0, min); | |
305 | static SENSOR_DEVICE_ATTR_2_RW(in0_max, in, 0, max); | |
306 | static SENSOR_DEVICE_ATTR_2_RO(in1_input, in, 1, input); | |
307 | static SENSOR_DEVICE_ATTR_2_RW(in1_min, in, 1, min); | |
308 | static SENSOR_DEVICE_ATTR_2_RW(in1_max, in, 1, max); | |
309 | static SENSOR_DEVICE_ATTR_2_RO(in2_input, in, 2, input); | |
310 | static SENSOR_DEVICE_ATTR_2_RW(in2_min, in, 2, min); | |
311 | static SENSOR_DEVICE_ATTR_2_RW(in2_max, in, 2, max); | |
312 | static SENSOR_DEVICE_ATTR_2_RO(in3_input, in, 3, input); | |
313 | static SENSOR_DEVICE_ATTR_2_RW(in3_min, in, 3, min); | |
314 | static SENSOR_DEVICE_ATTR_2_RW(in3_max, in, 3, max); | |
315 | static SENSOR_DEVICE_ATTR_2_RO(in4_input, in, 4, input); | |
316 | static SENSOR_DEVICE_ATTR_2_RW(in4_min, in, 4, min); | |
317 | static SENSOR_DEVICE_ATTR_2_RW(in4_max, in, 4, max); | |
318 | static SENSOR_DEVICE_ATTR_2_RO(in5_input, in, 5, input); | |
319 | static SENSOR_DEVICE_ATTR_2_RW(in5_min, in, 5, min); | |
320 | static SENSOR_DEVICE_ATTR_2_RW(in5_max, in, 5, max); | |
321 | ||
322 | static SENSOR_DEVICE_ATTR_2_RO(temp1_input, temp, 0, input); | |
323 | static SENSOR_DEVICE_ATTR_2_RW(temp1_min, temp, 0, min); | |
324 | static SENSOR_DEVICE_ATTR_2_RW(temp1_max, temp, 0, max); | |
325 | static SENSOR_DEVICE_ATTR_2_RO(temp2_input, temp, 1, input); | |
326 | static SENSOR_DEVICE_ATTR_2_RW(temp2_min, temp, 1, min); | |
327 | static SENSOR_DEVICE_ATTR_2_RW(temp2_max, temp, 1, max); | |
328 | static SENSOR_DEVICE_ATTR_2_RO(temp3_input, temp, 2, input); | |
329 | static SENSOR_DEVICE_ATTR_2_RW(temp3_min, temp, 2, min); | |
330 | static SENSOR_DEVICE_ATTR_2_RW(temp3_max, temp, 2, max); | |
331 | static SENSOR_DEVICE_ATTR_2_RO(temp4_input, temp, 3, input); | |
332 | static SENSOR_DEVICE_ATTR_2_RW(temp4_min, temp, 3, min); | |
333 | static SENSOR_DEVICE_ATTR_2_RW(temp4_max, temp, 3, max); | |
334 | static SENSOR_DEVICE_ATTR_2_RO(temp5_input, temp, 4, input); | |
335 | static SENSOR_DEVICE_ATTR_2_RW(temp5_min, temp, 4, min); | |
336 | static SENSOR_DEVICE_ATTR_2_RW(temp5_max, temp, 4, max); | |
337 | static SENSOR_DEVICE_ATTR_2_RO(temp6_input, temp, 5, input); | |
338 | static SENSOR_DEVICE_ATTR_2_RW(temp6_min, temp, 5, min); | |
339 | static SENSOR_DEVICE_ATTR_2_RW(temp6_max, temp, 5, max); | |
340 | ||
341 | static SENSOR_DEVICE_ATTR_2_RO(fan1_input, fan, 0, input); | |
342 | static SENSOR_DEVICE_ATTR_2_RW(fan1_min, fan, 0, min); | |
343 | static SENSOR_DEVICE_ATTR_2_RO(fan2_input, fan, 1, input); | |
344 | static SENSOR_DEVICE_ATTR_2_RW(fan2_min, fan, 1, min); | |
345 | static SENSOR_DEVICE_ATTR_2_RO(fan3_input, fan, 2, input); | |
346 | static SENSOR_DEVICE_ATTR_2_RW(fan3_min, fan, 2, min); | |
347 | static SENSOR_DEVICE_ATTR_2_RO(fan4_input, fan, 3, input); | |
348 | static SENSOR_DEVICE_ATTR_2_RW(fan4_min, fan, 3, min); | |
349 | static SENSOR_DEVICE_ATTR_2_RO(fan5_input, fan, 4, input); | |
350 | static SENSOR_DEVICE_ATTR_2_RW(fan5_min, fan, 4, min); | |
b0b349a8 | 351 | |
7b3dadc4 | 352 | static struct attribute *emc6w201_attrs[] = { |
b0b349a8 JD |
353 | &sensor_dev_attr_in0_input.dev_attr.attr, |
354 | &sensor_dev_attr_in0_min.dev_attr.attr, | |
355 | &sensor_dev_attr_in0_max.dev_attr.attr, | |
356 | &sensor_dev_attr_in1_input.dev_attr.attr, | |
357 | &sensor_dev_attr_in1_min.dev_attr.attr, | |
358 | &sensor_dev_attr_in1_max.dev_attr.attr, | |
359 | &sensor_dev_attr_in2_input.dev_attr.attr, | |
360 | &sensor_dev_attr_in2_min.dev_attr.attr, | |
361 | &sensor_dev_attr_in2_max.dev_attr.attr, | |
362 | &sensor_dev_attr_in3_input.dev_attr.attr, | |
363 | &sensor_dev_attr_in3_min.dev_attr.attr, | |
364 | &sensor_dev_attr_in3_max.dev_attr.attr, | |
365 | &sensor_dev_attr_in4_input.dev_attr.attr, | |
366 | &sensor_dev_attr_in4_min.dev_attr.attr, | |
367 | &sensor_dev_attr_in4_max.dev_attr.attr, | |
368 | &sensor_dev_attr_in5_input.dev_attr.attr, | |
369 | &sensor_dev_attr_in5_min.dev_attr.attr, | |
370 | &sensor_dev_attr_in5_max.dev_attr.attr, | |
371 | ||
372 | &sensor_dev_attr_temp1_input.dev_attr.attr, | |
373 | &sensor_dev_attr_temp1_min.dev_attr.attr, | |
374 | &sensor_dev_attr_temp1_max.dev_attr.attr, | |
375 | &sensor_dev_attr_temp2_input.dev_attr.attr, | |
376 | &sensor_dev_attr_temp2_min.dev_attr.attr, | |
377 | &sensor_dev_attr_temp2_max.dev_attr.attr, | |
378 | &sensor_dev_attr_temp3_input.dev_attr.attr, | |
379 | &sensor_dev_attr_temp3_min.dev_attr.attr, | |
380 | &sensor_dev_attr_temp3_max.dev_attr.attr, | |
381 | &sensor_dev_attr_temp4_input.dev_attr.attr, | |
382 | &sensor_dev_attr_temp4_min.dev_attr.attr, | |
383 | &sensor_dev_attr_temp4_max.dev_attr.attr, | |
384 | &sensor_dev_attr_temp5_input.dev_attr.attr, | |
385 | &sensor_dev_attr_temp5_min.dev_attr.attr, | |
386 | &sensor_dev_attr_temp5_max.dev_attr.attr, | |
387 | &sensor_dev_attr_temp6_input.dev_attr.attr, | |
388 | &sensor_dev_attr_temp6_min.dev_attr.attr, | |
389 | &sensor_dev_attr_temp6_max.dev_attr.attr, | |
390 | ||
391 | &sensor_dev_attr_fan1_input.dev_attr.attr, | |
392 | &sensor_dev_attr_fan1_min.dev_attr.attr, | |
393 | &sensor_dev_attr_fan2_input.dev_attr.attr, | |
394 | &sensor_dev_attr_fan2_min.dev_attr.attr, | |
395 | &sensor_dev_attr_fan3_input.dev_attr.attr, | |
396 | &sensor_dev_attr_fan3_min.dev_attr.attr, | |
397 | &sensor_dev_attr_fan4_input.dev_attr.attr, | |
398 | &sensor_dev_attr_fan4_min.dev_attr.attr, | |
399 | &sensor_dev_attr_fan5_input.dev_attr.attr, | |
400 | &sensor_dev_attr_fan5_min.dev_attr.attr, | |
401 | NULL | |
402 | }; | |
403 | ||
7b3dadc4 | 404 | ATTRIBUTE_GROUPS(emc6w201); |
b0b349a8 JD |
405 | |
406 | /* | |
407 | * Driver interface | |
408 | */ | |
409 | ||
410 | /* Return 0 if detection is successful, -ENODEV otherwise */ | |
411 | static int emc6w201_detect(struct i2c_client *client, | |
412 | struct i2c_board_info *info) | |
413 | { | |
414 | struct i2c_adapter *adapter = client->adapter; | |
415 | int company, verstep, config; | |
416 | ||
417 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) | |
418 | return -ENODEV; | |
419 | ||
420 | /* Identification */ | |
421 | company = i2c_smbus_read_byte_data(client, EMC6W201_REG_COMPANY); | |
422 | if (company != 0x5C) | |
423 | return -ENODEV; | |
424 | verstep = i2c_smbus_read_byte_data(client, EMC6W201_REG_VERSTEP); | |
425 | if (verstep < 0 || (verstep & 0xF0) != 0xB0) | |
426 | return -ENODEV; | |
427 | if ((verstep & 0x0F) > 2) { | |
51b8c2cd | 428 | dev_dbg(&client->dev, "Unknown EMC6W201 stepping %d\n", |
b0b349a8 JD |
429 | verstep & 0x0F); |
430 | return -ENODEV; | |
431 | } | |
432 | ||
433 | /* Check configuration */ | |
434 | config = i2c_smbus_read_byte_data(client, EMC6W201_REG_CONFIG); | |
b6b2a1e8 | 435 | if (config < 0 || (config & 0xF4) != 0x04) |
b0b349a8 JD |
436 | return -ENODEV; |
437 | if (!(config & 0x01)) { | |
438 | dev_err(&client->dev, "Monitoring not enabled\n"); | |
439 | return -ENODEV; | |
440 | } | |
441 | ||
f2f394db | 442 | strscpy(info->type, "emc6w201", I2C_NAME_SIZE); |
b0b349a8 JD |
443 | |
444 | return 0; | |
445 | } | |
446 | ||
67487038 | 447 | static int emc6w201_probe(struct i2c_client *client) |
b0b349a8 | 448 | { |
7b3dadc4 | 449 | struct device *dev = &client->dev; |
b0b349a8 | 450 | struct emc6w201_data *data; |
7b3dadc4 | 451 | struct device *hwmon_dev; |
b0b349a8 | 452 | |
7b3dadc4 | 453 | data = devm_kzalloc(dev, sizeof(struct emc6w201_data), GFP_KERNEL); |
6ecffe16 GR |
454 | if (!data) |
455 | return -ENOMEM; | |
b0b349a8 | 456 | |
7b3dadc4 | 457 | data->client = client; |
b0b349a8 JD |
458 | mutex_init(&data->update_lock); |
459 | ||
7b3dadc4 AL |
460 | hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, |
461 | data, | |
462 | emc6w201_groups); | |
463 | return PTR_ERR_OR_ZERO(hwmon_dev); | |
b0b349a8 JD |
464 | } |
465 | ||
466 | static const struct i2c_device_id emc6w201_id[] = { | |
467 | { "emc6w201", 0 }, | |
468 | { } | |
469 | }; | |
470 | MODULE_DEVICE_TABLE(i2c, emc6w201_id); | |
471 | ||
472 | static struct i2c_driver emc6w201_driver = { | |
473 | .class = I2C_CLASS_HWMON, | |
474 | .driver = { | |
475 | .name = "emc6w201", | |
476 | }, | |
1975d167 | 477 | .probe = emc6w201_probe, |
b0b349a8 JD |
478 | .id_table = emc6w201_id, |
479 | .detect = emc6w201_detect, | |
480 | .address_list = normal_i2c, | |
481 | }; | |
482 | ||
f0967eea | 483 | module_i2c_driver(emc6w201_driver); |
b0b349a8 | 484 | |
7c81c60f | 485 | MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>"); |
b0b349a8 JD |
486 | MODULE_DESCRIPTION("SMSC EMC6W201 hardware monitoring driver"); |
487 | MODULE_LICENSE("GPL"); |