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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / hwmon / smsc47m192.c
blob6cbb119e3d0e0a4f388c6740d4cb9e51d99dd62c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * smsc47m192.c - Support for hardware monitoring block of
4 * SMSC LPC47M192 and compatible Super I/O chips
5 *
6 * Copyright (C) 2006 Hartmut Rick <linux@rick.claranet.de>
7 *
8 * Derived from lm78.c and other chip drivers.
9 */
10
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/slab.h>
14 #include <linux/jiffies.h>
15 #include <linux/i2c.h>
16 #include <linux/hwmon.h>
17 #include <linux/hwmon-sysfs.h>
18 #include <linux/hwmon-vid.h>
19 #include <linux/err.h>
20 #include <linux/sysfs.h>
21 #include <linux/mutex.h>
22
23 /* Addresses to scan */
24 static const unsigned short normal_i2c[] = { 0x2c, 0x2d, I2C_CLIENT_END };
25
26 /* SMSC47M192 registers */
27 #define SMSC47M192_REG_IN(nr) ((nr) < 6 ? (0x20 + (nr)) : \
28 (0x50 + (nr) - 6))
29 #define SMSC47M192_REG_IN_MAX(nr) ((nr) < 6 ? (0x2b + (nr) * 2) : \
30 (0x54 + (((nr) - 6) * 2)))
31 #define SMSC47M192_REG_IN_MIN(nr) ((nr) < 6 ? (0x2c + (nr) * 2) : \
32 (0x55 + (((nr) - 6) * 2)))
33 static u8 SMSC47M192_REG_TEMP[3] = { 0x27, 0x26, 0x52 };
34 static u8 SMSC47M192_REG_TEMP_MAX[3] = { 0x39, 0x37, 0x58 };
35 static u8 SMSC47M192_REG_TEMP_MIN[3] = { 0x3A, 0x38, 0x59 };
36 #define SMSC47M192_REG_TEMP_OFFSET(nr) ((nr) == 2 ? 0x1e : 0x1f)
37 #define SMSC47M192_REG_ALARM1 0x41
38 #define SMSC47M192_REG_ALARM2 0x42
39 #define SMSC47M192_REG_VID 0x47
40 #define SMSC47M192_REG_VID4 0x49
41 #define SMSC47M192_REG_CONFIG 0x40
42 #define SMSC47M192_REG_SFR 0x4f
43 #define SMSC47M192_REG_COMPANY_ID 0x3e
44 #define SMSC47M192_REG_VERSION 0x3f
45
46 /* generalised scaling with integer rounding */
47 static inline int SCALE(long val, int mul, int div)
48 {
49 if (val < 0)
50 return (val * mul - div / 2) / div;
51 else
52 return (val * mul + div / 2) / div;
53 }
54
55 /* Conversions */
56
57 /* smsc47m192 internally scales voltage measurements */
58 static const u16 nom_mv[] = { 2500, 2250, 3300, 5000, 12000, 3300, 1500, 1800 };
59
60 static inline unsigned int IN_FROM_REG(u8 reg, int n)
61 {
62 return SCALE(reg, nom_mv[n], 192);
63 }
64
65 static inline u8 IN_TO_REG(unsigned long val, int n)
66 {
67 val = clamp_val(val, 0, nom_mv[n] * 255 / 192);
68 return SCALE(val, 192, nom_mv[n]);
69 }
70
71 /*
72 * TEMP: 0.001 degC units (-128C to +127C)
73 * REG: 1C/bit, two's complement
74 */
75 static inline s8 TEMP_TO_REG(long val)
76 {
77 return SCALE(clamp_val(val, -128000, 127000), 1, 1000);
78 }
79
80 static inline int TEMP_FROM_REG(s8 val)
81 {
82 return val * 1000;
83 }
84
85 struct smsc47m192_data {
86 struct i2c_client *client;
87 const struct attribute_group *groups[3];
88 struct mutex update_lock;
89 char valid; /* !=0 if following fields are valid */
90 unsigned long last_updated; /* In jiffies */
91
92 u8 in[8]; /* Register value */
93 u8 in_max[8]; /* Register value */
94 u8 in_min[8]; /* Register value */
95 s8 temp[3]; /* Register value */
96 s8 temp_max[3]; /* Register value */
97 s8 temp_min[3]; /* Register value */
98 s8 temp_offset[3]; /* Register value */
99 u16 alarms; /* Register encoding, combined */
100 u8 vid; /* Register encoding, combined */
101 u8 vrm;
102 };
103
104 static struct smsc47m192_data *smsc47m192_update_device(struct device *dev)
105 {
106 struct smsc47m192_data *data = dev_get_drvdata(dev);
107 struct i2c_client *client = data->client;
108 int i, config;
109
110 mutex_lock(&data->update_lock);
111
112 if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
113 || !data->valid) {
114 u8 sfr = i2c_smbus_read_byte_data(client, SMSC47M192_REG_SFR);
115
116 dev_dbg(&client->dev, "Starting smsc47m192 update\n");
117
118 for (i = 0; i <= 7; i++) {
119 data->in[i] = i2c_smbus_read_byte_data(client,
120 SMSC47M192_REG_IN(i));
121 data->in_min[i] = i2c_smbus_read_byte_data(client,
122 SMSC47M192_REG_IN_MIN(i));
123 data->in_max[i] = i2c_smbus_read_byte_data(client,
124 SMSC47M192_REG_IN_MAX(i));
125 }
126 for (i = 0; i < 3; i++) {
127 data->temp[i] = i2c_smbus_read_byte_data(client,
128 SMSC47M192_REG_TEMP[i]);
129 data->temp_max[i] = i2c_smbus_read_byte_data(client,
130 SMSC47M192_REG_TEMP_MAX[i]);
131 data->temp_min[i] = i2c_smbus_read_byte_data(client,
132 SMSC47M192_REG_TEMP_MIN[i]);
133 }
134 for (i = 1; i < 3; i++)
135 data->temp_offset[i] = i2c_smbus_read_byte_data(client,
136 SMSC47M192_REG_TEMP_OFFSET(i));
137 /*
138 * first offset is temp_offset[0] if SFR bit 4 is set,
139 * temp_offset[1] otherwise
140 */
141 if (sfr & 0x10) {
142 data->temp_offset[0] = data->temp_offset[1];
143 data->temp_offset[1] = 0;
144 } else
145 data->temp_offset[0] = 0;
146
147 data->vid = i2c_smbus_read_byte_data(client, SMSC47M192_REG_VID)
148 & 0x0f;
149 config = i2c_smbus_read_byte_data(client,
150 SMSC47M192_REG_CONFIG);
151 if (config & 0x20)
152 data->vid |= (i2c_smbus_read_byte_data(client,
153 SMSC47M192_REG_VID4) & 0x01) << 4;
154 data->alarms = i2c_smbus_read_byte_data(client,
155 SMSC47M192_REG_ALARM1) |
156 (i2c_smbus_read_byte_data(client,
157 SMSC47M192_REG_ALARM2) << 8);
158
159 data->last_updated = jiffies;
160 data->valid = 1;
161 }
162
163 mutex_unlock(&data->update_lock);
164
165 return data;
166 }
167
168 /* Voltages */
169 static ssize_t in_show(struct device *dev, struct device_attribute *attr,
170 char *buf)
171 {
172 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
173 int nr = sensor_attr->index;
174 struct smsc47m192_data *data = smsc47m192_update_device(dev);
175 return sprintf(buf, "%d\n", IN_FROM_REG(data->in[nr], nr));
176 }
177
178 static ssize_t in_min_show(struct device *dev, struct device_attribute *attr,
179 char *buf)
180 {
181 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
182 int nr = sensor_attr->index;
183 struct smsc47m192_data *data = smsc47m192_update_device(dev);
184 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[nr], nr));
185 }
186
187 static ssize_t in_max_show(struct device *dev, struct device_attribute *attr,
188 char *buf)
189 {
190 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
191 int nr = sensor_attr->index;
192 struct smsc47m192_data *data = smsc47m192_update_device(dev);
193 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[nr], nr));
194 }
195
196 static ssize_t in_min_store(struct device *dev, struct device_attribute *attr,
197 const char *buf, size_t count)
198 {
199 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
200 int nr = sensor_attr->index;
201 struct smsc47m192_data *data = dev_get_drvdata(dev);
202 struct i2c_client *client = data->client;
203 unsigned long val;
204 int err;
205
206 err = kstrtoul(buf, 10, &val);
207 if (err)
208 return err;
209
210 mutex_lock(&data->update_lock);
211 data->in_min[nr] = IN_TO_REG(val, nr);
212 i2c_smbus_write_byte_data(client, SMSC47M192_REG_IN_MIN(nr),
213 data->in_min[nr]);
214 mutex_unlock(&data->update_lock);
215 return count;
216 }
217
218 static ssize_t in_max_store(struct device *dev, struct device_attribute *attr,
219 const char *buf, size_t count)
220 {
221 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
222 int nr = sensor_attr->index;
223 struct smsc47m192_data *data = dev_get_drvdata(dev);
224 struct i2c_client *client = data->client;
225 unsigned long val;
226 int err;
227
228 err = kstrtoul(buf, 10, &val);
229 if (err)
230 return err;
231
232 mutex_lock(&data->update_lock);
233 data->in_max[nr] = IN_TO_REG(val, nr);
234 i2c_smbus_write_byte_data(client, SMSC47M192_REG_IN_MAX(nr),
235 data->in_max[nr]);
236 mutex_unlock(&data->update_lock);
237 return count;
238 }
239
240 static SENSOR_DEVICE_ATTR_RO(in0_input, in, 0);
241 static SENSOR_DEVICE_ATTR_RW(in0_min, in_min, 0);
242 static SENSOR_DEVICE_ATTR_RW(in0_max, in_max, 0);
243 static SENSOR_DEVICE_ATTR_RO(in1_input, in, 1);
244 static SENSOR_DEVICE_ATTR_RW(in1_min, in_min, 1);
245 static SENSOR_DEVICE_ATTR_RW(in1_max, in_max, 1);
246 static SENSOR_DEVICE_ATTR_RO(in2_input, in, 2);
247 static SENSOR_DEVICE_ATTR_RW(in2_min, in_min, 2);
248 static SENSOR_DEVICE_ATTR_RW(in2_max, in_max, 2);
249 static SENSOR_DEVICE_ATTR_RO(in3_input, in, 3);
250 static SENSOR_DEVICE_ATTR_RW(in3_min, in_min, 3);
251 static SENSOR_DEVICE_ATTR_RW(in3_max, in_max, 3);
252 static SENSOR_DEVICE_ATTR_RO(in4_input, in, 4);
253 static SENSOR_DEVICE_ATTR_RW(in4_min, in_min, 4);
254 static SENSOR_DEVICE_ATTR_RW(in4_max, in_max, 4);
255 static SENSOR_DEVICE_ATTR_RO(in5_input, in, 5);
256 static SENSOR_DEVICE_ATTR_RW(in5_min, in_min, 5);
257 static SENSOR_DEVICE_ATTR_RW(in5_max, in_max, 5);
258 static SENSOR_DEVICE_ATTR_RO(in6_input, in, 6);
259 static SENSOR_DEVICE_ATTR_RW(in6_min, in_min, 6);
260 static SENSOR_DEVICE_ATTR_RW(in6_max, in_max, 6);
261 static SENSOR_DEVICE_ATTR_RO(in7_input, in, 7);
262 static SENSOR_DEVICE_ATTR_RW(in7_min, in_min, 7);
263 static SENSOR_DEVICE_ATTR_RW(in7_max, in_max, 7);
264
265 /* Temperatures */
266 static ssize_t temp_show(struct device *dev, struct device_attribute *attr,
267 char *buf)
268 {
269 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
270 int nr = sensor_attr->index;
271 struct smsc47m192_data *data = smsc47m192_update_device(dev);
272 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr]));
273 }
274
275 static ssize_t temp_min_show(struct device *dev,
276 struct device_attribute *attr, char *buf)
277 {
278 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
279 int nr = sensor_attr->index;
280 struct smsc47m192_data *data = smsc47m192_update_device(dev);
281 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_min[nr]));
282 }
283
284 static ssize_t temp_max_show(struct device *dev,
285 struct device_attribute *attr, char *buf)
286 {
287 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
288 int nr = sensor_attr->index;
289 struct smsc47m192_data *data = smsc47m192_update_device(dev);
290 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_max[nr]));
291 }
292
293 static ssize_t temp_min_store(struct device *dev,
294 struct device_attribute *attr, const char *buf,
295 size_t count)
296 {
297 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
298 int nr = sensor_attr->index;
299 struct smsc47m192_data *data = dev_get_drvdata(dev);
300 struct i2c_client *client = data->client;
301 long val;
302 int err;
303
304 err = kstrtol(buf, 10, &val);
305 if (err)
306 return err;
307
308 mutex_lock(&data->update_lock);
309 data->temp_min[nr] = TEMP_TO_REG(val);
310 i2c_smbus_write_byte_data(client, SMSC47M192_REG_TEMP_MIN[nr],
311 data->temp_min[nr]);
312 mutex_unlock(&data->update_lock);
313 return count;
314 }
315
316 static ssize_t temp_max_store(struct device *dev,
317 struct device_attribute *attr, const char *buf,
318 size_t count)
319 {
320 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
321 int nr = sensor_attr->index;
322 struct smsc47m192_data *data = dev_get_drvdata(dev);
323 struct i2c_client *client = data->client;
324 long val;
325 int err;
326
327 err = kstrtol(buf, 10, &val);
328 if (err)
329 return err;
330
331 mutex_lock(&data->update_lock);
332 data->temp_max[nr] = TEMP_TO_REG(val);
333 i2c_smbus_write_byte_data(client, SMSC47M192_REG_TEMP_MAX[nr],
334 data->temp_max[nr]);
335 mutex_unlock(&data->update_lock);
336 return count;
337 }
338
339 static ssize_t temp_offset_show(struct device *dev,
340 struct device_attribute *attr, char *buf)
341 {
342 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
343 int nr = sensor_attr->index;
344 struct smsc47m192_data *data = smsc47m192_update_device(dev);
345 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_offset[nr]));
346 }
347
348 static ssize_t temp_offset_store(struct device *dev,
349 struct device_attribute *attr,
350 const char *buf, size_t count)
351 {
352 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
353 int nr = sensor_attr->index;
354 struct smsc47m192_data *data = dev_get_drvdata(dev);
355 struct i2c_client *client = data->client;
356 u8 sfr = i2c_smbus_read_byte_data(client, SMSC47M192_REG_SFR);
357 long val;
358 int err;
359
360 err = kstrtol(buf, 10, &val);
361 if (err)
362 return err;
363
364 mutex_lock(&data->update_lock);
365 data->temp_offset[nr] = TEMP_TO_REG(val);
366 if (nr > 1)
367 i2c_smbus_write_byte_data(client,
368 SMSC47M192_REG_TEMP_OFFSET(nr), data->temp_offset[nr]);
369 else if (data->temp_offset[nr] != 0) {
370 /*
371 * offset[0] and offset[1] share the same register,
372 * SFR bit 4 activates offset[0]
373 */
374 i2c_smbus_write_byte_data(client, SMSC47M192_REG_SFR,
375 (sfr & 0xef) | (nr == 0 ? 0x10 : 0));
376 data->temp_offset[1-nr] = 0;
377 i2c_smbus_write_byte_data(client,
378 SMSC47M192_REG_TEMP_OFFSET(nr), data->temp_offset[nr]);
379 } else if ((sfr & 0x10) == (nr == 0 ? 0x10 : 0))
380 i2c_smbus_write_byte_data(client,
381 SMSC47M192_REG_TEMP_OFFSET(nr), 0);
382 mutex_unlock(&data->update_lock);
383 return count;
384 }
385
386 static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0);
387 static SENSOR_DEVICE_ATTR_RW(temp1_min, temp_min, 0);
388 static SENSOR_DEVICE_ATTR_RW(temp1_max, temp_max, 0);
389 static SENSOR_DEVICE_ATTR_RW(temp1_offset, temp_offset, 0);
390 static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, 1);
391 static SENSOR_DEVICE_ATTR_RW(temp2_min, temp_min, 1);
392 static SENSOR_DEVICE_ATTR_RW(temp2_max, temp_max, 1);
393 static SENSOR_DEVICE_ATTR_RW(temp2_offset, temp_offset, 1);
394 static SENSOR_DEVICE_ATTR_RO(temp3_input, temp, 2);
395 static SENSOR_DEVICE_ATTR_RW(temp3_min, temp_min, 2);
396 static SENSOR_DEVICE_ATTR_RW(temp3_max, temp_max, 2);
397 static SENSOR_DEVICE_ATTR_RW(temp3_offset, temp_offset, 2);
398
399 /* VID */
400 static ssize_t cpu0_vid_show(struct device *dev,
401 struct device_attribute *attr, char *buf)
402 {
403 struct smsc47m192_data *data = smsc47m192_update_device(dev);
404 return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
405 }
406 static DEVICE_ATTR_RO(cpu0_vid);
407
408 static ssize_t vrm_show(struct device *dev, struct device_attribute *attr,
409 char *buf)
410 {
411 struct smsc47m192_data *data = dev_get_drvdata(dev);
412 return sprintf(buf, "%d\n", data->vrm);
413 }
414
415 static ssize_t vrm_store(struct device *dev, struct device_attribute *attr,
416 const char *buf, size_t count)
417 {
418 struct smsc47m192_data *data = dev_get_drvdata(dev);
419 unsigned long val;
420 int err;
421
422 err = kstrtoul(buf, 10, &val);
423 if (err)
424 return err;
425 if (val > 255)
426 return -EINVAL;
427
428 data->vrm = val;
429 return count;
430 }
431 static DEVICE_ATTR_RW(vrm);
432
433 /* Alarms */
434 static ssize_t alarm_show(struct device *dev, struct device_attribute *attr,
435 char *buf)
436 {
437 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
438 int nr = sensor_attr->index;
439 struct smsc47m192_data *data = smsc47m192_update_device(dev);
440 return sprintf(buf, "%u\n", (data->alarms & nr) ? 1 : 0);
441 }
442
443 static SENSOR_DEVICE_ATTR_RO(temp1_alarm, alarm, 0x0010);
444 static SENSOR_DEVICE_ATTR_RO(temp2_alarm, alarm, 0x0020);
445 static SENSOR_DEVICE_ATTR_RO(temp3_alarm, alarm, 0x0040);
446 static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, 0x4000);
447 static SENSOR_DEVICE_ATTR_RO(temp3_fault, alarm, 0x8000);
448 static SENSOR_DEVICE_ATTR_RO(in0_alarm, alarm, 0x0001);
449 static SENSOR_DEVICE_ATTR_RO(in1_alarm, alarm, 0x0002);
450 static SENSOR_DEVICE_ATTR_RO(in2_alarm, alarm, 0x0004);
451 static SENSOR_DEVICE_ATTR_RO(in3_alarm, alarm, 0x0008);
452 static SENSOR_DEVICE_ATTR_RO(in4_alarm, alarm, 0x0100);
453 static SENSOR_DEVICE_ATTR_RO(in5_alarm, alarm, 0x0200);
454 static SENSOR_DEVICE_ATTR_RO(in6_alarm, alarm, 0x0400);
455 static SENSOR_DEVICE_ATTR_RO(in7_alarm, alarm, 0x0800);
456
457 static struct attribute *smsc47m192_attributes[] = {
458 &sensor_dev_attr_in0_input.dev_attr.attr,
459 &sensor_dev_attr_in0_min.dev_attr.attr,
460 &sensor_dev_attr_in0_max.dev_attr.attr,
461 &sensor_dev_attr_in0_alarm.dev_attr.attr,
462 &sensor_dev_attr_in1_input.dev_attr.attr,
463 &sensor_dev_attr_in1_min.dev_attr.attr,
464 &sensor_dev_attr_in1_max.dev_attr.attr,
465 &sensor_dev_attr_in1_alarm.dev_attr.attr,
466 &sensor_dev_attr_in2_input.dev_attr.attr,
467 &sensor_dev_attr_in2_min.dev_attr.attr,
468 &sensor_dev_attr_in2_max.dev_attr.attr,
469 &sensor_dev_attr_in2_alarm.dev_attr.attr,
470 &sensor_dev_attr_in3_input.dev_attr.attr,
471 &sensor_dev_attr_in3_min.dev_attr.attr,
472 &sensor_dev_attr_in3_max.dev_attr.attr,
473 &sensor_dev_attr_in3_alarm.dev_attr.attr,
474 &sensor_dev_attr_in5_input.dev_attr.attr,
475 &sensor_dev_attr_in5_min.dev_attr.attr,
476 &sensor_dev_attr_in5_max.dev_attr.attr,
477 &sensor_dev_attr_in5_alarm.dev_attr.attr,
478 &sensor_dev_attr_in6_input.dev_attr.attr,
479 &sensor_dev_attr_in6_min.dev_attr.attr,
480 &sensor_dev_attr_in6_max.dev_attr.attr,
481 &sensor_dev_attr_in6_alarm.dev_attr.attr,
482 &sensor_dev_attr_in7_input.dev_attr.attr,
483 &sensor_dev_attr_in7_min.dev_attr.attr,
484 &sensor_dev_attr_in7_max.dev_attr.attr,
485 &sensor_dev_attr_in7_alarm.dev_attr.attr,
486
487 &sensor_dev_attr_temp1_input.dev_attr.attr,
488 &sensor_dev_attr_temp1_max.dev_attr.attr,
489 &sensor_dev_attr_temp1_min.dev_attr.attr,
490 &sensor_dev_attr_temp1_offset.dev_attr.attr,
491 &sensor_dev_attr_temp1_alarm.dev_attr.attr,
492 &sensor_dev_attr_temp2_input.dev_attr.attr,
493 &sensor_dev_attr_temp2_max.dev_attr.attr,
494 &sensor_dev_attr_temp2_min.dev_attr.attr,
495 &sensor_dev_attr_temp2_offset.dev_attr.attr,
496 &sensor_dev_attr_temp2_alarm.dev_attr.attr,
497 &sensor_dev_attr_temp2_fault.dev_attr.attr,
498 &sensor_dev_attr_temp3_input.dev_attr.attr,
499 &sensor_dev_attr_temp3_max.dev_attr.attr,
500 &sensor_dev_attr_temp3_min.dev_attr.attr,
501 &sensor_dev_attr_temp3_offset.dev_attr.attr,
502 &sensor_dev_attr_temp3_alarm.dev_attr.attr,
503 &sensor_dev_attr_temp3_fault.dev_attr.attr,
504
505 &dev_attr_cpu0_vid.attr,
506 &dev_attr_vrm.attr,
507 NULL
508 };
509
510 static const struct attribute_group smsc47m192_group = {
511 .attrs = smsc47m192_attributes,
512 };
513
514 static struct attribute *smsc47m192_attributes_in4[] = {
515 &sensor_dev_attr_in4_input.dev_attr.attr,
516 &sensor_dev_attr_in4_min.dev_attr.attr,
517 &sensor_dev_attr_in4_max.dev_attr.attr,
518 &sensor_dev_attr_in4_alarm.dev_attr.attr,
519 NULL
520 };
521
522 static const struct attribute_group smsc47m192_group_in4 = {
523 .attrs = smsc47m192_attributes_in4,
524 };
525
526 static void smsc47m192_init_client(struct i2c_client *client)
527 {
528 int i;
529 u8 config = i2c_smbus_read_byte_data(client, SMSC47M192_REG_CONFIG);
530 u8 sfr = i2c_smbus_read_byte_data(client, SMSC47M192_REG_SFR);
531
532 /* select cycle mode (pause 1 sec between updates) */
533 i2c_smbus_write_byte_data(client, SMSC47M192_REG_SFR,
534 (sfr & 0xfd) | 0x02);
535 if (!(config & 0x01)) {
536 /* initialize alarm limits */
537 for (i = 0; i < 8; i++) {
538 i2c_smbus_write_byte_data(client,
539 SMSC47M192_REG_IN_MIN(i), 0);
540 i2c_smbus_write_byte_data(client,
541 SMSC47M192_REG_IN_MAX(i), 0xff);
542 }
543 for (i = 0; i < 3; i++) {
544 i2c_smbus_write_byte_data(client,
545 SMSC47M192_REG_TEMP_MIN[i], 0x80);
546 i2c_smbus_write_byte_data(client,
547 SMSC47M192_REG_TEMP_MAX[i], 0x7f);
548 }
549
550 /* start monitoring */
551 i2c_smbus_write_byte_data(client, SMSC47M192_REG_CONFIG,
552 (config & 0xf7) | 0x01);
553 }
554 }
555
556 /* Return 0 if detection is successful, -ENODEV otherwise */
557 static int smsc47m192_detect(struct i2c_client *client,
558 struct i2c_board_info *info)
559 {
560 struct i2c_adapter *adapter = client->adapter;
561 int version;
562
563 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
564 return -ENODEV;
565
566 /* Detection criteria from sensors_detect script */
567 version = i2c_smbus_read_byte_data(client, SMSC47M192_REG_VERSION);
568 if (i2c_smbus_read_byte_data(client,
569 SMSC47M192_REG_COMPANY_ID) == 0x55
570 && (version & 0xf0) == 0x20
571 && (i2c_smbus_read_byte_data(client,
572 SMSC47M192_REG_VID) & 0x70) == 0x00
573 && (i2c_smbus_read_byte_data(client,
574 SMSC47M192_REG_VID4) & 0xfe) == 0x80) {
575 dev_info(&adapter->dev,
576 "found SMSC47M192 or compatible, "
577 "version 2, stepping A%d\n", version & 0x0f);
578 } else {
579 dev_dbg(&adapter->dev,
580 "SMSC47M192 detection failed at 0x%02x\n",
581 client->addr);
582 return -ENODEV;
583 }
584
585 strlcpy(info->type, "smsc47m192", I2C_NAME_SIZE);
586
587 return 0;
588 }
589
590 static int smsc47m192_probe(struct i2c_client *client,
591 const struct i2c_device_id *id)
592 {
593 struct device *dev = &client->dev;
594 struct device *hwmon_dev;
595 struct smsc47m192_data *data;
596 int config;
597
598 data = devm_kzalloc(dev, sizeof(struct smsc47m192_data), GFP_KERNEL);
599 if (!data)
600 return -ENOMEM;
601
602 data->client = client;
603 data->vrm = vid_which_vrm();
604 mutex_init(&data->update_lock);
605
606 /* Initialize the SMSC47M192 chip */
607 smsc47m192_init_client(client);
608
609 /* sysfs hooks */
610 data->groups[0] = &smsc47m192_group;
611 /* Pin 110 is either in4 (+12V) or VID4 */
612 config = i2c_smbus_read_byte_data(client, SMSC47M192_REG_CONFIG);
613 if (!(config & 0x20))
614 data->groups[1] = &smsc47m192_group_in4;
615
616 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
617 data, data->groups);
618 return PTR_ERR_OR_ZERO(hwmon_dev);
619 }
620
621 static const struct i2c_device_id smsc47m192_id[] = {
622 { "smsc47m192", 0 },
623 { }
624 };
625 MODULE_DEVICE_TABLE(i2c, smsc47m192_id);
626
627 static struct i2c_driver smsc47m192_driver = {
628 .class = I2C_CLASS_HWMON,
629 .driver = {
630 .name = "smsc47m192",
631 },
632 .probe = smsc47m192_probe,
633 .id_table = smsc47m192_id,
634 .detect = smsc47m192_detect,
635 .address_list = normal_i2c,
636 };
637
638 module_i2c_driver(smsc47m192_driver);
639
640 MODULE_AUTHOR("Hartmut Rick <linux@rick.claranet.de>");
641 MODULE_DESCRIPTION("SMSC47M192 driver");
642 MODULE_LICENSE("GPL");
Linux with added FPC-III support