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 */
37static 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)))
46static u8 SMSC47M192_REG_TEMP[3] = { 0x27, 0x26, 0x52 };
47static u8 SMSC47M192_REG_TEMP_MAX[3] = { 0x39, 0x37, 0x58 };
48static 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 */
60static 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 */
71static const u16 nom_mv[] = { 2500, 2250, 3300, 5000, 12000, 3300, 1500, 1800 };
72
73static inline unsigned int IN_FROM_REG(u8 reg, int n)
74{
75 return SCALE(reg, nom_mv[n], 192);
76}
77
78static inline u8 IN_TO_REG(unsigned long val, int n)
79{
80 val = clamp_val(val, 0, nom_mv[n] * 255 / 192);
81 return SCALE(val, 192, nom_mv[n]);
82}
83
84/*
85 * TEMP: 0.001 degC units (-128C to +127C)
86 * REG: 1C/bit, two's complement
87 */
88static inline s8 TEMP_TO_REG(long val)
89{
90 return SCALE(clamp_val(val, -128000, 127000), 1, 1000);
91}
92
93static inline int TEMP_FROM_REG(s8 val)
94{
95 return val * 1000;
96}
97
98struct smsc47m192_data {
99 struct i2c_client *client;
100 const struct attribute_group *groups[3];
101 struct mutex update_lock;
102 char valid; /* !=0 if following fields are valid */
103 unsigned long last_updated; /* In jiffies */
104
105 u8 in[8]; /* Register value */
106 u8 in_max[8]; /* Register value */
107 u8 in_min[8]; /* Register value */
108 s8 temp[3]; /* Register value */
109 s8 temp_max[3]; /* Register value */
110 s8 temp_min[3]; /* Register value */
111 s8 temp_offset[3]; /* Register value */
112 u16 alarms; /* Register encoding, combined */
113 u8 vid; /* Register encoding, combined */
114 u8 vrm;
115};
116
117static struct smsc47m192_data *smsc47m192_update_device(struct device *dev)
118{
119 struct smsc47m192_data *data = dev_get_drvdata(dev);
120 struct i2c_client *client = data->client;
121 int i, config;
122
123 mutex_lock(&data->update_lock);
124
125 if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
126 || !data->valid) {
127 u8 sfr = i2c_smbus_read_byte_data(client, SMSC47M192_REG_SFR);
128
129 dev_dbg(&client->dev, "Starting smsc47m192 update\n");
130
131 for (i = 0; i <= 7; i++) {
132 data->in[i] = i2c_smbus_read_byte_data(client,
133 SMSC47M192_REG_IN(i));
134 data->in_min[i] = i2c_smbus_read_byte_data(client,
135 SMSC47M192_REG_IN_MIN(i));
136 data->in_max[i] = i2c_smbus_read_byte_data(client,
137 SMSC47M192_REG_IN_MAX(i));
138 }
139 for (i = 0; i < 3; i++) {
140 data->temp[i] = i2c_smbus_read_byte_data(client,
141 SMSC47M192_REG_TEMP[i]);
142 data->temp_max[i] = i2c_smbus_read_byte_data(client,
143 SMSC47M192_REG_TEMP_MAX[i]);
144 data->temp_min[i] = i2c_smbus_read_byte_data(client,
145 SMSC47M192_REG_TEMP_MIN[i]);
146 }
147 for (i = 1; i < 3; i++)
148 data->temp_offset[i] = i2c_smbus_read_byte_data(client,
149 SMSC47M192_REG_TEMP_OFFSET(i));
150 /*
151 * first offset is temp_offset[0] if SFR bit 4 is set,
152 * temp_offset[1] otherwise
153 */
154 if (sfr & 0x10) {
155 data->temp_offset[0] = data->temp_offset[1];
156 data->temp_offset[1] = 0;
157 } else
158 data->temp_offset[0] = 0;
159
160 data->vid = i2c_smbus_read_byte_data(client, SMSC47M192_REG_VID)
161 & 0x0f;
162 config = i2c_smbus_read_byte_data(client,
163 SMSC47M192_REG_CONFIG);
164 if (config & 0x20)
165 data->vid |= (i2c_smbus_read_byte_data(client,
166 SMSC47M192_REG_VID4) & 0x01) << 4;
167 data->alarms = i2c_smbus_read_byte_data(client,
168 SMSC47M192_REG_ALARM1) |
169 (i2c_smbus_read_byte_data(client,
170 SMSC47M192_REG_ALARM2) << 8);
171
172 data->last_updated = jiffies;
173 data->valid = 1;
174 }
175
176 mutex_unlock(&data->update_lock);
177
178 return data;
179}
180
181/* Voltages */
182static ssize_t show_in(struct device *dev, struct device_attribute *attr,
183 char *buf)
184{
185 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
186 int nr = sensor_attr->index;
187 struct smsc47m192_data *data = smsc47m192_update_device(dev);
188 return sprintf(buf, "%d\n", IN_FROM_REG(data->in[nr], nr));
189}
190
191static ssize_t show_in_min(struct device *dev, struct device_attribute *attr,
192 char *buf)
193{
194 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
195 int nr = sensor_attr->index;
196 struct smsc47m192_data *data = smsc47m192_update_device(dev);
197 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[nr], nr));
198}
199
200static ssize_t show_in_max(struct device *dev, struct device_attribute *attr,
201 char *buf)
202{
203 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
204 int nr = sensor_attr->index;
205 struct smsc47m192_data *data = smsc47m192_update_device(dev);
206 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[nr], nr));
207}
208
209static ssize_t set_in_min(struct device *dev, struct device_attribute *attr,
210 const char *buf, size_t count)
211{
212 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
213 int nr = sensor_attr->index;
214 struct smsc47m192_data *data = dev_get_drvdata(dev);
215 struct i2c_client *client = data->client;
216 unsigned long val;
217 int err;
218
219 err = kstrtoul(buf, 10, &val);
220 if (err)
221 return err;
222
223 mutex_lock(&data->update_lock);
224 data->in_min[nr] = IN_TO_REG(val, nr);
225 i2c_smbus_write_byte_data(client, SMSC47M192_REG_IN_MIN(nr),
226 data->in_min[nr]);
227 mutex_unlock(&data->update_lock);
228 return count;
229}
230
231static ssize_t set_in_max(struct device *dev, struct device_attribute *attr,
232 const char *buf, size_t count)
233{
234 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
235 int nr = sensor_attr->index;
236 struct smsc47m192_data *data = dev_get_drvdata(dev);
237 struct i2c_client *client = data->client;
238 unsigned long val;
239 int err;
240
241 err = kstrtoul(buf, 10, &val);
242 if (err)
243 return err;
244
245 mutex_lock(&data->update_lock);
246 data->in_max[nr] = IN_TO_REG(val, nr);
247 i2c_smbus_write_byte_data(client, SMSC47M192_REG_IN_MAX(nr),
248 data->in_max[nr]);
249 mutex_unlock(&data->update_lock);
250 return count;
251}
252
253#define show_in_offset(offset) \
254static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO, \
255 show_in, NULL, offset); \
256static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \
257 show_in_min, set_in_min, offset); \
258static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \
259 show_in_max, set_in_max, offset);
260
261show_in_offset(0)
262show_in_offset(1)
263show_in_offset(2)
264show_in_offset(3)
265show_in_offset(4)
266show_in_offset(5)
267show_in_offset(6)
268show_in_offset(7)
269
270/* Temperatures */
271static ssize_t show_temp(struct device *dev, struct device_attribute *attr,
272 char *buf)
273{
274 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
275 int nr = sensor_attr->index;
276 struct smsc47m192_data *data = smsc47m192_update_device(dev);
277 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr]));
278}
279
280static ssize_t show_temp_min(struct device *dev, struct device_attribute *attr,
281 char *buf)
282{
283 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
284 int nr = sensor_attr->index;
285 struct smsc47m192_data *data = smsc47m192_update_device(dev);
286 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_min[nr]));
287}
288
289static ssize_t show_temp_max(struct device *dev, struct device_attribute *attr,
290 char *buf)
291{
292 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
293 int nr = sensor_attr->index;
294 struct smsc47m192_data *data = smsc47m192_update_device(dev);
295 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_max[nr]));
296}
297
298static ssize_t set_temp_min(struct device *dev, struct device_attribute *attr,
299 const char *buf, size_t count)
300{
301 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
302 int nr = sensor_attr->index;
303 struct smsc47m192_data *data = dev_get_drvdata(dev);
304 struct i2c_client *client = data->client;
305 long val;
306 int err;
307
308 err = kstrtol(buf, 10, &val);
309 if (err)
310 return err;
311
312 mutex_lock(&data->update_lock);
313 data->temp_min[nr] = TEMP_TO_REG(val);
314 i2c_smbus_write_byte_data(client, SMSC47M192_REG_TEMP_MIN[nr],
315 data->temp_min[nr]);
316 mutex_unlock(&data->update_lock);
317 return count;
318}
319
320static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr,
321 const char *buf, size_t count)
322{
323 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
324 int nr = sensor_attr->index;
325 struct smsc47m192_data *data = dev_get_drvdata(dev);
326 struct i2c_client *client = data->client;
327 long val;
328 int err;
329
330 err = kstrtol(buf, 10, &val);
331 if (err)
332 return err;
333
334 mutex_lock(&data->update_lock);
335 data->temp_max[nr] = TEMP_TO_REG(val);
336 i2c_smbus_write_byte_data(client, SMSC47M192_REG_TEMP_MAX[nr],
337 data->temp_max[nr]);
338 mutex_unlock(&data->update_lock);
339 return count;
340}
341
342static ssize_t show_temp_offset(struct device *dev, struct device_attribute
343 *attr, char *buf)
344{
345 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
346 int nr = sensor_attr->index;
347 struct smsc47m192_data *data = smsc47m192_update_device(dev);
348 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_offset[nr]));
349}
350
351static ssize_t set_temp_offset(struct device *dev, struct device_attribute
352 *attr, const char *buf, size_t count)
353{
354 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
355 int nr = sensor_attr->index;
356 struct smsc47m192_data *data = dev_get_drvdata(dev);
357 struct i2c_client *client = data->client;
358 u8 sfr = i2c_smbus_read_byte_data(client, SMSC47M192_REG_SFR);
359 long val;
360 int err;
361
362 err = kstrtol(buf, 10, &val);
363 if (err)
364 return err;
365
366 mutex_lock(&data->update_lock);
367 data->temp_offset[nr] = TEMP_TO_REG(val);
368 if (nr > 1)
369 i2c_smbus_write_byte_data(client,
370 SMSC47M192_REG_TEMP_OFFSET(nr), data->temp_offset[nr]);
371 else if (data->temp_offset[nr] != 0) {
372 /*
373 * offset[0] and offset[1] share the same register,
374 * SFR bit 4 activates offset[0]
375 */
376 i2c_smbus_write_byte_data(client, SMSC47M192_REG_SFR,
377 (sfr & 0xef) | (nr == 0 ? 0x10 : 0));
378 data->temp_offset[1-nr] = 0;
379 i2c_smbus_write_byte_data(client,
380 SMSC47M192_REG_TEMP_OFFSET(nr), data->temp_offset[nr]);
381 } else if ((sfr & 0x10) == (nr == 0 ? 0x10 : 0))
382 i2c_smbus_write_byte_data(client,
383 SMSC47M192_REG_TEMP_OFFSET(nr), 0);
384 mutex_unlock(&data->update_lock);
385 return count;
386}
387
388#define show_temp_index(index) \
389static SENSOR_DEVICE_ATTR(temp##index##_input, S_IRUGO, \
390 show_temp, NULL, index-1); \
391static SENSOR_DEVICE_ATTR(temp##index##_min, S_IRUGO | S_IWUSR, \
392 show_temp_min, set_temp_min, index-1); \
393static SENSOR_DEVICE_ATTR(temp##index##_max, S_IRUGO | S_IWUSR, \
394 show_temp_max, set_temp_max, index-1); \
395static SENSOR_DEVICE_ATTR(temp##index##_offset, S_IRUGO | S_IWUSR, \
396 show_temp_offset, set_temp_offset, index-1);
397
398show_temp_index(1)
399show_temp_index(2)
400show_temp_index(3)
401
402/* VID */
403static ssize_t cpu0_vid_show(struct device *dev,
404 struct device_attribute *attr, char *buf)
405{
406 struct smsc47m192_data *data = smsc47m192_update_device(dev);
407 return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
408}
409static DEVICE_ATTR_RO(cpu0_vid);
410
411static ssize_t vrm_show(struct device *dev, struct device_attribute *attr,
412 char *buf)
413{
414 struct smsc47m192_data *data = dev_get_drvdata(dev);
415 return sprintf(buf, "%d\n", data->vrm);
416}
417
418static ssize_t vrm_store(struct device *dev, struct device_attribute *attr,
419 const char *buf, size_t count)
420{
421 struct smsc47m192_data *data = dev_get_drvdata(dev);
422 unsigned long val;
423 int err;
424
425 err = kstrtoul(buf, 10, &val);
426 if (err)
427 return err;
428 if (val > 255)
429 return -EINVAL;
430
431 data->vrm = val;
432 return count;
433}
434static DEVICE_ATTR_RW(vrm);
435
436/* Alarms */
437static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
438 char *buf)
439{
440 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
441 int nr = sensor_attr->index;
442 struct smsc47m192_data *data = smsc47m192_update_device(dev);
443 return sprintf(buf, "%u\n", (data->alarms & nr) ? 1 : 0);
444}
445
446static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 0x0010);
447static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 0x0020);
448static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 0x0040);
449static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 0x4000);
450static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 0x8000);
451static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0x0001);
452static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 0x0002);
453static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 0x0004);
454static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 0x0008);
455static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 0x0100);
456static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 0x0200);
457static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 0x0400);
458static SENSOR_DEVICE_ATTR(in7_alarm, S_IRUGO, show_alarm, NULL, 0x0800);
459
460static struct attribute *smsc47m192_attributes[] = {
461 &sensor_dev_attr_in0_input.dev_attr.attr,
462 &sensor_dev_attr_in0_min.dev_attr.attr,
463 &sensor_dev_attr_in0_max.dev_attr.attr,
464 &sensor_dev_attr_in0_alarm.dev_attr.attr,
465 &sensor_dev_attr_in1_input.dev_attr.attr,
466 &sensor_dev_attr_in1_min.dev_attr.attr,
467 &sensor_dev_attr_in1_max.dev_attr.attr,
468 &sensor_dev_attr_in1_alarm.dev_attr.attr,
469 &sensor_dev_attr_in2_input.dev_attr.attr,
470 &sensor_dev_attr_in2_min.dev_attr.attr,
471 &sensor_dev_attr_in2_max.dev_attr.attr,
472 &sensor_dev_attr_in2_alarm.dev_attr.attr,
473 &sensor_dev_attr_in3_input.dev_attr.attr,
474 &sensor_dev_attr_in3_min.dev_attr.attr,
475 &sensor_dev_attr_in3_max.dev_attr.attr,
476 &sensor_dev_attr_in3_alarm.dev_attr.attr,
477 &sensor_dev_attr_in5_input.dev_attr.attr,
478 &sensor_dev_attr_in5_min.dev_attr.attr,
479 &sensor_dev_attr_in5_max.dev_attr.attr,
480 &sensor_dev_attr_in5_alarm.dev_attr.attr,
481 &sensor_dev_attr_in6_input.dev_attr.attr,
482 &sensor_dev_attr_in6_min.dev_attr.attr,
483 &sensor_dev_attr_in6_max.dev_attr.attr,
484 &sensor_dev_attr_in6_alarm.dev_attr.attr,
485 &sensor_dev_attr_in7_input.dev_attr.attr,
486 &sensor_dev_attr_in7_min.dev_attr.attr,
487 &sensor_dev_attr_in7_max.dev_attr.attr,
488 &sensor_dev_attr_in7_alarm.dev_attr.attr,
489
490 &sensor_dev_attr_temp1_input.dev_attr.attr,
491 &sensor_dev_attr_temp1_max.dev_attr.attr,
492 &sensor_dev_attr_temp1_min.dev_attr.attr,
493 &sensor_dev_attr_temp1_offset.dev_attr.attr,
494 &sensor_dev_attr_temp1_alarm.dev_attr.attr,
495 &sensor_dev_attr_temp2_input.dev_attr.attr,
496 &sensor_dev_attr_temp2_max.dev_attr.attr,
497 &sensor_dev_attr_temp2_min.dev_attr.attr,
498 &sensor_dev_attr_temp2_offset.dev_attr.attr,
499 &sensor_dev_attr_temp2_alarm.dev_attr.attr,
500 &sensor_dev_attr_temp2_fault.dev_attr.attr,
501 &sensor_dev_attr_temp3_input.dev_attr.attr,
502 &sensor_dev_attr_temp3_max.dev_attr.attr,
503 &sensor_dev_attr_temp3_min.dev_attr.attr,
504 &sensor_dev_attr_temp3_offset.dev_attr.attr,
505 &sensor_dev_attr_temp3_alarm.dev_attr.attr,
506 &sensor_dev_attr_temp3_fault.dev_attr.attr,
507
508 &dev_attr_cpu0_vid.attr,
509 &dev_attr_vrm.attr,
510 NULL
511};
512
513static const struct attribute_group smsc47m192_group = {
514 .attrs = smsc47m192_attributes,
515};
516
517static struct attribute *smsc47m192_attributes_in4[] = {
518 &sensor_dev_attr_in4_input.dev_attr.attr,
519 &sensor_dev_attr_in4_min.dev_attr.attr,
520 &sensor_dev_attr_in4_max.dev_attr.attr,
521 &sensor_dev_attr_in4_alarm.dev_attr.attr,
522 NULL
523};
524
525static const struct attribute_group smsc47m192_group_in4 = {
526 .attrs = smsc47m192_attributes_in4,
527};
528
529static void smsc47m192_init_client(struct i2c_client *client)
530{
531 int i;
532 u8 config = i2c_smbus_read_byte_data(client, SMSC47M192_REG_CONFIG);
533 u8 sfr = i2c_smbus_read_byte_data(client, SMSC47M192_REG_SFR);
534
535 /* select cycle mode (pause 1 sec between updates) */
536 i2c_smbus_write_byte_data(client, SMSC47M192_REG_SFR,
537 (sfr & 0xfd) | 0x02);
538 if (!(config & 0x01)) {
539 /* initialize alarm limits */
540 for (i = 0; i < 8; i++) {
541 i2c_smbus_write_byte_data(client,
542 SMSC47M192_REG_IN_MIN(i), 0);
543 i2c_smbus_write_byte_data(client,
544 SMSC47M192_REG_IN_MAX(i), 0xff);
545 }
546 for (i = 0; i < 3; i++) {
547 i2c_smbus_write_byte_data(client,
548 SMSC47M192_REG_TEMP_MIN[i], 0x80);
549 i2c_smbus_write_byte_data(client,
550 SMSC47M192_REG_TEMP_MAX[i], 0x7f);
551 }
552
553 /* start monitoring */
554 i2c_smbus_write_byte_data(client, SMSC47M192_REG_CONFIG,
555 (config & 0xf7) | 0x01);
556 }
557}
558
559/* Return 0 if detection is successful, -ENODEV otherwise */
560static int smsc47m192_detect(struct i2c_client *client,
561 struct i2c_board_info *info)
562{
563 struct i2c_adapter *adapter = client->adapter;
564 int version;
565
566 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
567 return -ENODEV;
568
569 /* Detection criteria from sensors_detect script */
570 version = i2c_smbus_read_byte_data(client, SMSC47M192_REG_VERSION);
571 if (i2c_smbus_read_byte_data(client,
572 SMSC47M192_REG_COMPANY_ID) == 0x55
573 && (version & 0xf0) == 0x20
574 && (i2c_smbus_read_byte_data(client,
575 SMSC47M192_REG_VID) & 0x70) == 0x00
576 && (i2c_smbus_read_byte_data(client,
577 SMSC47M192_REG_VID4) & 0xfe) == 0x80) {
578 dev_info(&adapter->dev,
579 "found SMSC47M192 or compatible, "
580 "version 2, stepping A%d\n", version & 0x0f);
581 } else {
582 dev_dbg(&adapter->dev,
583 "SMSC47M192 detection failed at 0x%02x\n",
584 client->addr);
585 return -ENODEV;
586 }
587
588 strlcpy(info->type, "smsc47m192", I2C_NAME_SIZE);
589
590 return 0;
591}
592
593static int smsc47m192_probe(struct i2c_client *client,
594 const struct i2c_device_id *id)
595{
596 struct device *dev = &client->dev;
597 struct device *hwmon_dev;
598 struct smsc47m192_data *data;
599 int config;
600
601 data = devm_kzalloc(dev, sizeof(struct smsc47m192_data), GFP_KERNEL);
602 if (!data)
603 return -ENOMEM;
604
605 data->client = client;
606 data->vrm = vid_which_vrm();
607 mutex_init(&data->update_lock);
608
609 /* Initialize the SMSC47M192 chip */
610 smsc47m192_init_client(client);
611
612 /* sysfs hooks */
613 data->groups[0] = &smsc47m192_group;
614 /* Pin 110 is either in4 (+12V) or VID4 */
615 config = i2c_smbus_read_byte_data(client, SMSC47M192_REG_CONFIG);
616 if (!(config & 0x20))
617 data->groups[1] = &smsc47m192_group_in4;
618
619 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
620 data, data->groups);
621 return PTR_ERR_OR_ZERO(hwmon_dev);
622}
623
624static const struct i2c_device_id smsc47m192_id[] = {
625 { "smsc47m192", 0 },
626 { }
627};
628MODULE_DEVICE_TABLE(i2c, smsc47m192_id);
629
630static struct i2c_driver smsc47m192_driver = {
631 .class = I2C_CLASS_HWMON,
632 .driver = {
633 .name = "smsc47m192",
634 },
635 .probe = smsc47m192_probe,
636 .id_table = smsc47m192_id,
637 .detect = smsc47m192_detect,
638 .address_list = normal_i2c,
639};
640
641module_i2c_driver(smsc47m192_driver);
642
643MODULE_AUTHOR("Hartmut Rick <linux@rick.claranet.de>");
644MODULE_DESCRIPTION("SMSC47M192 driver");
645MODULE_LICENSE("GPL");
646