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atm: iphase: Fix Spectre v1 vulnerability
[linux/fpc-iii.git] / drivers / hwmon / smsc47m192.c
blob6ac7cda72d4cbe8ec3bfa628d7e5fdf266d2c731
1 /*
2 * smsc47m192.c - Support for hardware monitoring block of
3 * SMSC LPC47M192 and compatible Super I/O chips
4 *
5 * Copyright (C) 2006 Hartmut Rick <linux@rick.claranet.de>
6 *
7 * Derived from lm78.c and other chip drivers.
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 */
23
24 #include <linux/module.h>
25 #include <linux/init.h>
26 #include <linux/slab.h>
27 #include <linux/jiffies.h>
28 #include <linux/i2c.h>
29 #include <linux/hwmon.h>
30 #include <linux/hwmon-sysfs.h>
31 #include <linux/hwmon-vid.h>
32 #include <linux/err.h>
33 #include <linux/sysfs.h>
34 #include <linux/mutex.h>
35
36 /* Addresses to scan */
37 static const unsigned short normal_i2c[] = { 0x2c, 0x2d, I2C_CLIENT_END };
38
39 /* SMSC47M192 registers */
40 #define SMSC47M192_REG_IN(nr) ((nr) < 6 ? (0x20 + (nr)) : \
41 (0x50 + (nr) - 6))
42 #define SMSC47M192_REG_IN_MAX(nr) ((nr) < 6 ? (0x2b + (nr) * 2) : \
43 (0x54 + (((nr) - 6) * 2)))
44 #define SMSC47M192_REG_IN_MIN(nr) ((nr) < 6 ? (0x2c + (nr) * 2) : \
45 (0x55 + (((nr) - 6) * 2)))
46 static u8 SMSC47M192_REG_TEMP[3] = { 0x27, 0x26, 0x52 };
47 static u8 SMSC47M192_REG_TEMP_MAX[3] = { 0x39, 0x37, 0x58 };
48 static u8 SMSC47M192_REG_TEMP_MIN[3] = { 0x3A, 0x38, 0x59 };
49 #define SMSC47M192_REG_TEMP_OFFSET(nr) ((nr) == 2 ? 0x1e : 0x1f)
50 #define SMSC47M192_REG_ALARM1 0x41
51 #define SMSC47M192_REG_ALARM2 0x42
52 #define SMSC47M192_REG_VID 0x47
53 #define SMSC47M192_REG_VID4 0x49
54 #define SMSC47M192_REG_CONFIG 0x40
55 #define SMSC47M192_REG_SFR 0x4f
56 #define SMSC47M192_REG_COMPANY_ID 0x3e
57 #define SMSC47M192_REG_VERSION 0x3f
58
59 /* generalised scaling with integer rounding */
60 static inline int SCALE(long val, int mul, int div)
61 {
62 if (val < 0)
63 return (val * mul - div / 2) / div;
64 else
65 return (val * mul + div / 2) / div;
66 }
67
68 /* Conversions */
69
70 /* smsc47m192 internally scales voltage measurements */
71 static const u16 nom_mv[] = { 2500, 2250, 3300, 5000, 12000, 3300, 1500, 1800 };
72
73 static inline unsigned int IN_FROM_REG(u8 reg, int n)
74 {
75 return SCALE(reg, nom_mv[n], 192);
76 }
77
78 static inline u8 IN_TO_REG(unsigned long val, int n)
79 {
80 return clamp_val(SCALE(val, 192, nom_mv[n]), 0, 255);
81 }
82
83 /*
84 * TEMP: 0.001 degC units (-128C to +127C)
85 * REG: 1C/bit, two's complement
86 */
87 static inline s8 TEMP_TO_REG(int val)
88 {
89 return SCALE(clamp_val(val, -128000, 127000), 1, 1000);
90 }
91
92 static inline int TEMP_FROM_REG(s8 val)
93 {
94 return val * 1000;
95 }
96
97 struct smsc47m192_data {
98 struct i2c_client *client;
99 const struct attribute_group *groups[3];
100 struct mutex update_lock;
101 char valid; /* !=0 if following fields are valid */
102 unsigned long last_updated; /* In jiffies */
103
104 u8 in[8]; /* Register value */
105 u8 in_max[8]; /* Register value */
106 u8 in_min[8]; /* Register value */
107 s8 temp[3]; /* Register value */
108 s8 temp_max[3]; /* Register value */
109 s8 temp_min[3]; /* Register value */
110 s8 temp_offset[3]; /* Register value */
111 u16 alarms; /* Register encoding, combined */
112 u8 vid; /* Register encoding, combined */
113 u8 vrm;
114 };
115
116 static struct smsc47m192_data *smsc47m192_update_device(struct device *dev)
117 {
118 struct smsc47m192_data *data = dev_get_drvdata(dev);
119 struct i2c_client *client = data->client;
120 int i, config;
121
122 mutex_lock(&data->update_lock);
123
124 if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
125 || !data->valid) {
126 u8 sfr = i2c_smbus_read_byte_data(client, SMSC47M192_REG_SFR);
127
128 dev_dbg(&client->dev, "Starting smsc47m192 update\n");
129
130 for (i = 0; i <= 7; i++) {
131 data->in[i] = i2c_smbus_read_byte_data(client,
132 SMSC47M192_REG_IN(i));
133 data->in_min[i] = i2c_smbus_read_byte_data(client,
134 SMSC47M192_REG_IN_MIN(i));
135 data->in_max[i] = i2c_smbus_read_byte_data(client,
136 SMSC47M192_REG_IN_MAX(i));
137 }
138 for (i = 0; i < 3; i++) {
139 data->temp[i] = i2c_smbus_read_byte_data(client,
140 SMSC47M192_REG_TEMP[i]);
141 data->temp_max[i] = i2c_smbus_read_byte_data(client,
142 SMSC47M192_REG_TEMP_MAX[i]);
143 data->temp_min[i] = i2c_smbus_read_byte_data(client,
144 SMSC47M192_REG_TEMP_MIN[i]);
145 }
146 for (i = 1; i < 3; i++)
147 data->temp_offset[i] = i2c_smbus_read_byte_data(client,
148 SMSC47M192_REG_TEMP_OFFSET(i));
149 /*
150 * first offset is temp_offset[0] if SFR bit 4 is set,
151 * temp_offset[1] otherwise
152 */
153 if (sfr & 0x10) {
154 data->temp_offset[0] = data->temp_offset[1];
155 data->temp_offset[1] = 0;
156 } else
157 data->temp_offset[0] = 0;
158
159 data->vid = i2c_smbus_read_byte_data(client, SMSC47M192_REG_VID)
160 & 0x0f;
161 config = i2c_smbus_read_byte_data(client,
162 SMSC47M192_REG_CONFIG);
163 if (config & 0x20)
164 data->vid |= (i2c_smbus_read_byte_data(client,
165 SMSC47M192_REG_VID4) & 0x01) << 4;
166 data->alarms = i2c_smbus_read_byte_data(client,
167 SMSC47M192_REG_ALARM1) |
168 (i2c_smbus_read_byte_data(client,
169 SMSC47M192_REG_ALARM2) << 8);
170
171 data->last_updated = jiffies;
172 data->valid = 1;
173 }
174
175 mutex_unlock(&data->update_lock);
176
177 return data;
178 }
179
180 /* Voltages */
181 static ssize_t show_in(struct device *dev, struct device_attribute *attr,
182 char *buf)
183 {
184 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
185 int nr = sensor_attr->index;
186 struct smsc47m192_data *data = smsc47m192_update_device(dev);
187 return sprintf(buf, "%d\n", IN_FROM_REG(data->in[nr], nr));
188 }
189
190 static ssize_t show_in_min(struct device *dev, struct device_attribute *attr,
191 char *buf)
192 {
193 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
194 int nr = sensor_attr->index;
195 struct smsc47m192_data *data = smsc47m192_update_device(dev);
196 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[nr], nr));
197 }
198
199 static ssize_t show_in_max(struct device *dev, struct device_attribute *attr,
200 char *buf)
201 {
202 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
203 int nr = sensor_attr->index;
204 struct smsc47m192_data *data = smsc47m192_update_device(dev);
205 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[nr], nr));
206 }
207
208 static ssize_t set_in_min(struct device *dev, struct device_attribute *attr,
209 const char *buf, size_t count)
210 {
211 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
212 int nr = sensor_attr->index;
213 struct smsc47m192_data *data = dev_get_drvdata(dev);
214 struct i2c_client *client = data->client;
215 unsigned long val;
216 int err;
217
218 err = kstrtoul(buf, 10, &val);
219 if (err)
220 return err;
221
222 mutex_lock(&data->update_lock);
223 data->in_min[nr] = IN_TO_REG(val, nr);
224 i2c_smbus_write_byte_data(client, SMSC47M192_REG_IN_MIN(nr),
225 data->in_min[nr]);
226 mutex_unlock(&data->update_lock);
227 return count;
228 }
229
230 static ssize_t set_in_max(struct device *dev, struct device_attribute *attr,
231 const char *buf, size_t count)
232 {
233 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
234 int nr = sensor_attr->index;
235 struct smsc47m192_data *data = dev_get_drvdata(dev);
236 struct i2c_client *client = data->client;
237 unsigned long val;
238 int err;
239
240 err = kstrtoul(buf, 10, &val);
241 if (err)
242 return err;
243
244 mutex_lock(&data->update_lock);
245 data->in_max[nr] = IN_TO_REG(val, nr);
246 i2c_smbus_write_byte_data(client, SMSC47M192_REG_IN_MAX(nr),
247 data->in_max[nr]);
248 mutex_unlock(&data->update_lock);
249 return count;
250 }
251
252 #define show_in_offset(offset) \
253 static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO, \
254 show_in, NULL, offset); \
255 static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \
256 show_in_min, set_in_min, offset); \
257 static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \
258 show_in_max, set_in_max, offset);
259
260 show_in_offset(0)
261 show_in_offset(1)
262 show_in_offset(2)
263 show_in_offset(3)
264 show_in_offset(4)
265 show_in_offset(5)
266 show_in_offset(6)
267 show_in_offset(7)
268
269 /* Temperatures */
270 static ssize_t show_temp(struct device *dev, struct device_attribute *attr,
271 char *buf)
272 {
273 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
274 int nr = sensor_attr->index;
275 struct smsc47m192_data *data = smsc47m192_update_device(dev);
276 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr]));
277 }
278
279 static ssize_t show_temp_min(struct device *dev, struct device_attribute *attr,
280 char *buf)
281 {
282 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
283 int nr = sensor_attr->index;
284 struct smsc47m192_data *data = smsc47m192_update_device(dev);
285 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_min[nr]));
286 }
287
288 static ssize_t show_temp_max(struct device *dev, struct device_attribute *attr,
289 char *buf)
290 {
291 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
292 int nr = sensor_attr->index;
293 struct smsc47m192_data *data = smsc47m192_update_device(dev);
294 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_max[nr]));
295 }
296
297 static ssize_t set_temp_min(struct device *dev, struct device_attribute *attr,
298 const char *buf, size_t count)
299 {
300 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
301 int nr = sensor_attr->index;
302 struct smsc47m192_data *data = dev_get_drvdata(dev);
303 struct i2c_client *client = data->client;
304 long val;
305 int err;
306
307 err = kstrtol(buf, 10, &val);
308 if (err)
309 return err;
310
311 mutex_lock(&data->update_lock);
312 data->temp_min[nr] = TEMP_TO_REG(val);
313 i2c_smbus_write_byte_data(client, SMSC47M192_REG_TEMP_MIN[nr],
314 data->temp_min[nr]);
315 mutex_unlock(&data->update_lock);
316 return count;
317 }
318
319 static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr,
320 const char *buf, size_t count)
321 {
322 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
323 int nr = sensor_attr->index;
324 struct smsc47m192_data *data = dev_get_drvdata(dev);
325 struct i2c_client *client = data->client;
326 long val;
327 int err;
328
329 err = kstrtol(buf, 10, &val);
330 if (err)
331 return err;
332
333 mutex_lock(&data->update_lock);
334 data->temp_max[nr] = TEMP_TO_REG(val);
335 i2c_smbus_write_byte_data(client, SMSC47M192_REG_TEMP_MAX[nr],
336 data->temp_max[nr]);
337 mutex_unlock(&data->update_lock);
338 return count;
339 }
340
341 static ssize_t show_temp_offset(struct device *dev, struct device_attribute
342 *attr, char *buf)
343 {
344 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
345 int nr = sensor_attr->index;
346 struct smsc47m192_data *data = smsc47m192_update_device(dev);
347 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_offset[nr]));
348 }
349
350 static ssize_t set_temp_offset(struct device *dev, struct device_attribute
351 *attr, const char *buf, size_t count)
352 {
353 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
354 int nr = sensor_attr->index;
355 struct smsc47m192_data *data = dev_get_drvdata(dev);
356 struct i2c_client *client = data->client;
357 u8 sfr = i2c_smbus_read_byte_data(client, SMSC47M192_REG_SFR);
358 long val;
359 int err;
360
361 err = kstrtol(buf, 10, &val);
362 if (err)
363 return err;
364
365 mutex_lock(&data->update_lock);
366 data->temp_offset[nr] = TEMP_TO_REG(val);
367 if (nr > 1)
368 i2c_smbus_write_byte_data(client,
369 SMSC47M192_REG_TEMP_OFFSET(nr), data->temp_offset[nr]);
370 else if (data->temp_offset[nr] != 0) {
371 /*
372 * offset[0] and offset[1] share the same register,
373 * SFR bit 4 activates offset[0]
374 */
375 i2c_smbus_write_byte_data(client, SMSC47M192_REG_SFR,
376 (sfr & 0xef) | (nr == 0 ? 0x10 : 0));
377 data->temp_offset[1-nr] = 0;
378 i2c_smbus_write_byte_data(client,
379 SMSC47M192_REG_TEMP_OFFSET(nr), data->temp_offset[nr]);
380 } else if ((sfr & 0x10) == (nr == 0 ? 0x10 : 0))
381 i2c_smbus_write_byte_data(client,
382 SMSC47M192_REG_TEMP_OFFSET(nr), 0);
383 mutex_unlock(&data->update_lock);
384 return count;
385 }
386
387 #define show_temp_index(index) \
388 static SENSOR_DEVICE_ATTR(temp##index##_input, S_IRUGO, \
389 show_temp, NULL, index-1); \
390 static SENSOR_DEVICE_ATTR(temp##index##_min, S_IRUGO | S_IWUSR, \
391 show_temp_min, set_temp_min, index-1); \
392 static SENSOR_DEVICE_ATTR(temp##index##_max, S_IRUGO | S_IWUSR, \
393 show_temp_max, set_temp_max, index-1); \
394 static SENSOR_DEVICE_ATTR(temp##index##_offset, S_IRUGO | S_IWUSR, \
395 show_temp_offset, set_temp_offset, index-1);
396
397 show_temp_index(1)
398 show_temp_index(2)
399 show_temp_index(3)
400
401 /* VID */
402 static ssize_t show_vid(struct device *dev, struct device_attribute *attr,
403 char *buf)
404 {
405 struct smsc47m192_data *data = smsc47m192_update_device(dev);
406 return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
407 }
408 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
409
410 static ssize_t show_vrm(struct device *dev, struct device_attribute *attr,
411 char *buf)
412 {
413 struct smsc47m192_data *data = dev_get_drvdata(dev);
414 return sprintf(buf, "%d\n", data->vrm);
415 }
416
417 static ssize_t set_vrm(struct device *dev, struct device_attribute *attr,
418 const char *buf, size_t count)
419 {
420 struct smsc47m192_data *data = dev_get_drvdata(dev);
421 unsigned long val;
422 int err;
423
424 err = kstrtoul(buf, 10, &val);
425 if (err)
426 return err;
427 if (val > 255)
428 return -EINVAL;
429
430 data->vrm = val;
431 return count;
432 }
433 static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm, set_vrm);
434
435 /* Alarms */
436 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
437 char *buf)
438 {
439 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
440 int nr = sensor_attr->index;
441 struct smsc47m192_data *data = smsc47m192_update_device(dev);
442 return sprintf(buf, "%u\n", (data->alarms & nr) ? 1 : 0);
443 }
444
445 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 0x0010);
446 static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 0x0020);
447 static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 0x0040);
448 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 0x4000);
449 static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 0x8000);
450 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0x0001);
451 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 0x0002);
452 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 0x0004);
453 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 0x0008);
454 static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 0x0100);
455 static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 0x0200);
456 static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 0x0400);
457 static SENSOR_DEVICE_ATTR(in7_alarm, S_IRUGO, show_alarm, NULL, 0x0800);
458
459 static struct attribute *smsc47m192_attributes[] = {
460 &sensor_dev_attr_in0_input.dev_attr.attr,
461 &sensor_dev_attr_in0_min.dev_attr.attr,
462 &sensor_dev_attr_in0_max.dev_attr.attr,
463 &sensor_dev_attr_in0_alarm.dev_attr.attr,
464 &sensor_dev_attr_in1_input.dev_attr.attr,
465 &sensor_dev_attr_in1_min.dev_attr.attr,
466 &sensor_dev_attr_in1_max.dev_attr.attr,
467 &sensor_dev_attr_in1_alarm.dev_attr.attr,
468 &sensor_dev_attr_in2_input.dev_attr.attr,
469 &sensor_dev_attr_in2_min.dev_attr.attr,
470 &sensor_dev_attr_in2_max.dev_attr.attr,
471 &sensor_dev_attr_in2_alarm.dev_attr.attr,
472 &sensor_dev_attr_in3_input.dev_attr.attr,
473 &sensor_dev_attr_in3_min.dev_attr.attr,
474 &sensor_dev_attr_in3_max.dev_attr.attr,
475 &sensor_dev_attr_in3_alarm.dev_attr.attr,
476 &sensor_dev_attr_in5_input.dev_attr.attr,
477 &sensor_dev_attr_in5_min.dev_attr.attr,
478 &sensor_dev_attr_in5_max.dev_attr.attr,
479 &sensor_dev_attr_in5_alarm.dev_attr.attr,
480 &sensor_dev_attr_in6_input.dev_attr.attr,
481 &sensor_dev_attr_in6_min.dev_attr.attr,
482 &sensor_dev_attr_in6_max.dev_attr.attr,
483 &sensor_dev_attr_in6_alarm.dev_attr.attr,
484 &sensor_dev_attr_in7_input.dev_attr.attr,
485 &sensor_dev_attr_in7_min.dev_attr.attr,
486 &sensor_dev_attr_in7_max.dev_attr.attr,
487 &sensor_dev_attr_in7_alarm.dev_attr.attr,
488
489 &sensor_dev_attr_temp1_input.dev_attr.attr,
490 &sensor_dev_attr_temp1_max.dev_attr.attr,
491 &sensor_dev_attr_temp1_min.dev_attr.attr,
492 &sensor_dev_attr_temp1_offset.dev_attr.attr,
493 &sensor_dev_attr_temp1_alarm.dev_attr.attr,
494 &sensor_dev_attr_temp2_input.dev_attr.attr,
495 &sensor_dev_attr_temp2_max.dev_attr.attr,
496 &sensor_dev_attr_temp2_min.dev_attr.attr,
497 &sensor_dev_attr_temp2_offset.dev_attr.attr,
498 &sensor_dev_attr_temp2_alarm.dev_attr.attr,
499 &sensor_dev_attr_temp2_fault.dev_attr.attr,
500 &sensor_dev_attr_temp3_input.dev_attr.attr,
501 &sensor_dev_attr_temp3_max.dev_attr.attr,
502 &sensor_dev_attr_temp3_min.dev_attr.attr,
503 &sensor_dev_attr_temp3_offset.dev_attr.attr,
504 &sensor_dev_attr_temp3_alarm.dev_attr.attr,
505 &sensor_dev_attr_temp3_fault.dev_attr.attr,
506
507 &dev_attr_cpu0_vid.attr,
508 &dev_attr_vrm.attr,
509 NULL
510 };
511
512 static const struct attribute_group smsc47m192_group = {
513 .attrs = smsc47m192_attributes,
514 };
515
516 static struct attribute *smsc47m192_attributes_in4[] = {
517 &sensor_dev_attr_in4_input.dev_attr.attr,
518 &sensor_dev_attr_in4_min.dev_attr.attr,
519 &sensor_dev_attr_in4_max.dev_attr.attr,
520 &sensor_dev_attr_in4_alarm.dev_attr.attr,
521 NULL
522 };
523
524 static const struct attribute_group smsc47m192_group_in4 = {
525 .attrs = smsc47m192_attributes_in4,
526 };
527
528 static void smsc47m192_init_client(struct i2c_client *client)
529 {
530 int i;
531 u8 config = i2c_smbus_read_byte_data(client, SMSC47M192_REG_CONFIG);
532 u8 sfr = i2c_smbus_read_byte_data(client, SMSC47M192_REG_SFR);
533
534 /* select cycle mode (pause 1 sec between updates) */
535 i2c_smbus_write_byte_data(client, SMSC47M192_REG_SFR,
536 (sfr & 0xfd) | 0x02);
537 if (!(config & 0x01)) {
538 /* initialize alarm limits */
539 for (i = 0; i < 8; i++) {
540 i2c_smbus_write_byte_data(client,
541 SMSC47M192_REG_IN_MIN(i), 0);
542 i2c_smbus_write_byte_data(client,
543 SMSC47M192_REG_IN_MAX(i), 0xff);
544 }
545 for (i = 0; i < 3; i++) {
546 i2c_smbus_write_byte_data(client,
547 SMSC47M192_REG_TEMP_MIN[i], 0x80);
548 i2c_smbus_write_byte_data(client,
549 SMSC47M192_REG_TEMP_MAX[i], 0x7f);
550 }
551
552 /* start monitoring */
553 i2c_smbus_write_byte_data(client, SMSC47M192_REG_CONFIG,
554 (config & 0xf7) | 0x01);
555 }
556 }
557
558 /* Return 0 if detection is successful, -ENODEV otherwise */
559 static int smsc47m192_detect(struct i2c_client *client,
560 struct i2c_board_info *info)
561 {
562 struct i2c_adapter *adapter = client->adapter;
563 int version;
564
565 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
566 return -ENODEV;
567
568 /* Detection criteria from sensors_detect script */
569 version = i2c_smbus_read_byte_data(client, SMSC47M192_REG_VERSION);
570 if (i2c_smbus_read_byte_data(client,
571 SMSC47M192_REG_COMPANY_ID) == 0x55
572 && (version & 0xf0) == 0x20
573 && (i2c_smbus_read_byte_data(client,
574 SMSC47M192_REG_VID) & 0x70) == 0x00
575 && (i2c_smbus_read_byte_data(client,
576 SMSC47M192_REG_VID4) & 0xfe) == 0x80) {
577 dev_info(&adapter->dev,
578 "found SMSC47M192 or compatible, "
579 "version 2, stepping A%d\n", version & 0x0f);
580 } else {
581 dev_dbg(&adapter->dev,
582 "SMSC47M192 detection failed at 0x%02x\n",
583 client->addr);
584 return -ENODEV;
585 }
586
587 strlcpy(info->type, "smsc47m192", I2C_NAME_SIZE);
588
589 return 0;
590 }
591
592 static int smsc47m192_probe(struct i2c_client *client,
593 const struct i2c_device_id *id)
594 {
595 struct device *dev = &client->dev;
596 struct device *hwmon_dev;
597 struct smsc47m192_data *data;
598 int config;
599
600 data = devm_kzalloc(dev, sizeof(struct smsc47m192_data), GFP_KERNEL);
601 if (!data)
602 return -ENOMEM;
603
604 data->client = client;
605 data->vrm = vid_which_vrm();
606 mutex_init(&data->update_lock);
607
608 /* Initialize the SMSC47M192 chip */
609 smsc47m192_init_client(client);
610
611 /* sysfs hooks */
612 data->groups[0] = &smsc47m192_group;
613 /* Pin 110 is either in4 (+12V) or VID4 */
614 config = i2c_smbus_read_byte_data(client, SMSC47M192_REG_CONFIG);
615 if (!(config & 0x20))
616 data->groups[1] = &smsc47m192_group_in4;
617
618 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
619 data, data->groups);
620 return PTR_ERR_OR_ZERO(hwmon_dev);
621 }
622
623 static const struct i2c_device_id smsc47m192_id[] = {
624 { "smsc47m192", 0 },
625 { }
626 };
627 MODULE_DEVICE_TABLE(i2c, smsc47m192_id);
628
629 static struct i2c_driver smsc47m192_driver = {
630 .class = I2C_CLASS_HWMON,
631 .driver = {
632 .name = "smsc47m192",
633 },
634 .probe = smsc47m192_probe,
635 .id_table = smsc47m192_id,
636 .detect = smsc47m192_detect,
637 .address_list = normal_i2c,
638 };
639
640 module_i2c_driver(smsc47m192_driver);
641
642 MODULE_AUTHOR("Hartmut Rick <linux@rick.claranet.de>");
643 MODULE_DESCRIPTION("SMSC47M192 driver");
644 MODULE_LICENSE("GPL");
Linux with added FPC-III support