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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 return SENSORS_LIMIT(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 */
87static inline s8 TEMP_TO_REG(int val)
88{
89 return SENSORS_LIMIT(SCALE(val, 1, 1000), -128000, 127000);
90}
91
92static inline int TEMP_FROM_REG(s8 val)
93{
94 return val * 1000;
95}
96
97struct smsc47m192_data {
98 struct device *hwmon_dev;
99 struct mutex update_lock;
100 char valid; /* !=0 if following fields are valid */
101 unsigned long last_updated; /* In jiffies */
102
103 u8 in[8]; /* Register value */
104 u8 in_max[8]; /* Register value */
105 u8 in_min[8]; /* Register value */
106 s8 temp[3]; /* Register value */
107 s8 temp_max[3]; /* Register value */
108 s8 temp_min[3]; /* Register value */
109 s8 temp_offset[3]; /* Register value */
110 u16 alarms; /* Register encoding, combined */
111 u8 vid; /* Register encoding, combined */
112 u8 vrm;
113};
114
115static int smsc47m192_probe(struct i2c_client *client,
116 const struct i2c_device_id *id);
117static int smsc47m192_detect(struct i2c_client *client,
118 struct i2c_board_info *info);
119static int smsc47m192_remove(struct i2c_client *client);
120static struct smsc47m192_data *smsc47m192_update_device(struct device *dev);
121
122static const struct i2c_device_id smsc47m192_id[] = {
123 { "smsc47m192", 0 },
124 { }
125};
126MODULE_DEVICE_TABLE(i2c, smsc47m192_id);
127
128static struct i2c_driver smsc47m192_driver = {
129 .class = I2C_CLASS_HWMON,
130 .driver = {
131 .name = "smsc47m192",
132 },
133 .probe = smsc47m192_probe,
134 .remove = smsc47m192_remove,
135 .id_table = smsc47m192_id,
136 .detect = smsc47m192_detect,
137 .address_list = normal_i2c,
138};
139
140/* Voltages */
141static ssize_t show_in(struct device *dev, struct device_attribute *attr,
142 char *buf)
143{
144 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
145 int nr = sensor_attr->index;
146 struct smsc47m192_data *data = smsc47m192_update_device(dev);
147 return sprintf(buf, "%d\n", IN_FROM_REG(data->in[nr], nr));
148}
149
150static ssize_t show_in_min(struct device *dev, struct device_attribute *attr,
151 char *buf)
152{
153 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
154 int nr = sensor_attr->index;
155 struct smsc47m192_data *data = smsc47m192_update_device(dev);
156 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[nr], nr));
157}
158
159static ssize_t show_in_max(struct device *dev, struct device_attribute *attr,
160 char *buf)
161{
162 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
163 int nr = sensor_attr->index;
164 struct smsc47m192_data *data = smsc47m192_update_device(dev);
165 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[nr], nr));
166}
167
168static ssize_t set_in_min(struct device *dev, struct device_attribute *attr,
169 const char *buf, size_t count)
170{
171 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
172 int nr = sensor_attr->index;
173 struct i2c_client *client = to_i2c_client(dev);
174 struct smsc47m192_data *data = i2c_get_clientdata(client);
175 unsigned long val;
176 int err;
177
178 err = kstrtoul(buf, 10, &val);
179 if (err)
180 return err;
181
182 mutex_lock(&data->update_lock);
183 data->in_min[nr] = IN_TO_REG(val, nr);
184 i2c_smbus_write_byte_data(client, SMSC47M192_REG_IN_MIN(nr),
185 data->in_min[nr]);
186 mutex_unlock(&data->update_lock);
187 return count;
188}
189
190static ssize_t set_in_max(struct device *dev, struct device_attribute *attr,
191 const char *buf, size_t count)
192{
193 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
194 int nr = sensor_attr->index;
195 struct i2c_client *client = to_i2c_client(dev);
196 struct smsc47m192_data *data = i2c_get_clientdata(client);
197 unsigned long val;
198 int err;
199
200 err = kstrtoul(buf, 10, &val);
201 if (err)
202 return err;
203
204 mutex_lock(&data->update_lock);
205 data->in_max[nr] = IN_TO_REG(val, nr);
206 i2c_smbus_write_byte_data(client, SMSC47M192_REG_IN_MAX(nr),
207 data->in_max[nr]);
208 mutex_unlock(&data->update_lock);
209 return count;
210}
211
212#define show_in_offset(offset) \
213static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO, \
214 show_in, NULL, offset); \
215static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \
216 show_in_min, set_in_min, offset); \
217static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \
218 show_in_max, set_in_max, offset);
219
220show_in_offset(0)
221show_in_offset(1)
222show_in_offset(2)
223show_in_offset(3)
224show_in_offset(4)
225show_in_offset(5)
226show_in_offset(6)
227show_in_offset(7)
228
229/* Temperatures */
230static ssize_t show_temp(struct device *dev, struct device_attribute *attr,
231 char *buf)
232{
233 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
234 int nr = sensor_attr->index;
235 struct smsc47m192_data *data = smsc47m192_update_device(dev);
236 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr]));
237}
238
239static ssize_t show_temp_min(struct device *dev, struct device_attribute *attr,
240 char *buf)
241{
242 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
243 int nr = sensor_attr->index;
244 struct smsc47m192_data *data = smsc47m192_update_device(dev);
245 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_min[nr]));
246}
247
248static ssize_t show_temp_max(struct device *dev, struct device_attribute *attr,
249 char *buf)
250{
251 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
252 int nr = sensor_attr->index;
253 struct smsc47m192_data *data = smsc47m192_update_device(dev);
254 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_max[nr]));
255}
256
257static ssize_t set_temp_min(struct device *dev, struct device_attribute *attr,
258 const char *buf, size_t count)
259{
260 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
261 int nr = sensor_attr->index;
262 struct i2c_client *client = to_i2c_client(dev);
263 struct smsc47m192_data *data = i2c_get_clientdata(client);
264 long val;
265 int err;
266
267 err = kstrtol(buf, 10, &val);
268 if (err)
269 return err;
270
271 mutex_lock(&data->update_lock);
272 data->temp_min[nr] = TEMP_TO_REG(val);
273 i2c_smbus_write_byte_data(client, SMSC47M192_REG_TEMP_MIN[nr],
274 data->temp_min[nr]);
275 mutex_unlock(&data->update_lock);
276 return count;
277}
278
279static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr,
280 const char *buf, size_t count)
281{
282 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
283 int nr = sensor_attr->index;
284 struct i2c_client *client = to_i2c_client(dev);
285 struct smsc47m192_data *data = i2c_get_clientdata(client);
286 long val;
287 int err;
288
289 err = kstrtol(buf, 10, &val);
290 if (err)
291 return err;
292
293 mutex_lock(&data->update_lock);
294 data->temp_max[nr] = TEMP_TO_REG(val);
295 i2c_smbus_write_byte_data(client, SMSC47M192_REG_TEMP_MAX[nr],
296 data->temp_max[nr]);
297 mutex_unlock(&data->update_lock);
298 return count;
299}
300
301static ssize_t show_temp_offset(struct device *dev, struct device_attribute
302 *attr, char *buf)
303{
304 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
305 int nr = sensor_attr->index;
306 struct smsc47m192_data *data = smsc47m192_update_device(dev);
307 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_offset[nr]));
308}
309
310static ssize_t set_temp_offset(struct device *dev, struct device_attribute
311 *attr, const char *buf, size_t count)
312{
313 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
314 int nr = sensor_attr->index;
315 struct i2c_client *client = to_i2c_client(dev);
316 struct smsc47m192_data *data = i2c_get_clientdata(client);
317 u8 sfr = i2c_smbus_read_byte_data(client, SMSC47M192_REG_SFR);
318 long val;
319 int err;
320
321 err = kstrtol(buf, 10, &val);
322 if (err)
323 return err;
324
325 mutex_lock(&data->update_lock);
326 data->temp_offset[nr] = TEMP_TO_REG(val);
327 if (nr > 1)
328 i2c_smbus_write_byte_data(client,
329 SMSC47M192_REG_TEMP_OFFSET(nr), data->temp_offset[nr]);
330 else if (data->temp_offset[nr] != 0) {
331 /*
332 * offset[0] and offset[1] share the same register,
333 * SFR bit 4 activates offset[0]
334 */
335 i2c_smbus_write_byte_data(client, SMSC47M192_REG_SFR,
336 (sfr & 0xef) | (nr == 0 ? 0x10 : 0));
337 data->temp_offset[1-nr] = 0;
338 i2c_smbus_write_byte_data(client,
339 SMSC47M192_REG_TEMP_OFFSET(nr), data->temp_offset[nr]);
340 } else if ((sfr & 0x10) == (nr == 0 ? 0x10 : 0))
341 i2c_smbus_write_byte_data(client,
342 SMSC47M192_REG_TEMP_OFFSET(nr), 0);
343 mutex_unlock(&data->update_lock);
344 return count;
345}
346
347#define show_temp_index(index) \
348static SENSOR_DEVICE_ATTR(temp##index##_input, S_IRUGO, \
349 show_temp, NULL, index-1); \
350static SENSOR_DEVICE_ATTR(temp##index##_min, S_IRUGO | S_IWUSR, \
351 show_temp_min, set_temp_min, index-1); \
352static SENSOR_DEVICE_ATTR(temp##index##_max, S_IRUGO | S_IWUSR, \
353 show_temp_max, set_temp_max, index-1); \
354static SENSOR_DEVICE_ATTR(temp##index##_offset, S_IRUGO | S_IWUSR, \
355 show_temp_offset, set_temp_offset, index-1);
356
357show_temp_index(1)
358show_temp_index(2)
359show_temp_index(3)
360
361/* VID */
362static ssize_t show_vid(struct device *dev, struct device_attribute *attr,
363 char *buf)
364{
365 struct smsc47m192_data *data = smsc47m192_update_device(dev);
366 return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
367}
368static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
369
370static ssize_t show_vrm(struct device *dev, struct device_attribute *attr,
371 char *buf)
372{
373 struct smsc47m192_data *data = dev_get_drvdata(dev);
374 return sprintf(buf, "%d\n", data->vrm);
375}
376
377static ssize_t set_vrm(struct device *dev, struct device_attribute *attr,
378 const char *buf, size_t count)
379{
380 struct smsc47m192_data *data = dev_get_drvdata(dev);
381 unsigned long val;
382 int err;
383
384 err = kstrtoul(buf, 10, &val);
385 if (err)
386 return err;
387
388 data->vrm = val;
389 return count;
390}
391static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm, set_vrm);
392
393/* Alarms */
394static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
395 char *buf)
396{
397 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
398 int nr = sensor_attr->index;
399 struct smsc47m192_data *data = smsc47m192_update_device(dev);
400 return sprintf(buf, "%u\n", (data->alarms & nr) ? 1 : 0);
401}
402
403static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 0x0010);
404static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 0x0020);
405static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 0x0040);
406static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 0x4000);
407static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 0x8000);
408static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0x0001);
409static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 0x0002);
410static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 0x0004);
411static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 0x0008);
412static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 0x0100);
413static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 0x0200);
414static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 0x0400);
415static SENSOR_DEVICE_ATTR(in7_alarm, S_IRUGO, show_alarm, NULL, 0x0800);
416
417static struct attribute *smsc47m192_attributes[] = {
418 &sensor_dev_attr_in0_input.dev_attr.attr,
419 &sensor_dev_attr_in0_min.dev_attr.attr,
420 &sensor_dev_attr_in0_max.dev_attr.attr,
421 &sensor_dev_attr_in0_alarm.dev_attr.attr,
422 &sensor_dev_attr_in1_input.dev_attr.attr,
423 &sensor_dev_attr_in1_min.dev_attr.attr,
424 &sensor_dev_attr_in1_max.dev_attr.attr,
425 &sensor_dev_attr_in1_alarm.dev_attr.attr,
426 &sensor_dev_attr_in2_input.dev_attr.attr,
427 &sensor_dev_attr_in2_min.dev_attr.attr,
428 &sensor_dev_attr_in2_max.dev_attr.attr,
429 &sensor_dev_attr_in2_alarm.dev_attr.attr,
430 &sensor_dev_attr_in3_input.dev_attr.attr,
431 &sensor_dev_attr_in3_min.dev_attr.attr,
432 &sensor_dev_attr_in3_max.dev_attr.attr,
433 &sensor_dev_attr_in3_alarm.dev_attr.attr,
434 &sensor_dev_attr_in5_input.dev_attr.attr,
435 &sensor_dev_attr_in5_min.dev_attr.attr,
436 &sensor_dev_attr_in5_max.dev_attr.attr,
437 &sensor_dev_attr_in5_alarm.dev_attr.attr,
438 &sensor_dev_attr_in6_input.dev_attr.attr,
439 &sensor_dev_attr_in6_min.dev_attr.attr,
440 &sensor_dev_attr_in6_max.dev_attr.attr,
441 &sensor_dev_attr_in6_alarm.dev_attr.attr,
442 &sensor_dev_attr_in7_input.dev_attr.attr,
443 &sensor_dev_attr_in7_min.dev_attr.attr,
444 &sensor_dev_attr_in7_max.dev_attr.attr,
445 &sensor_dev_attr_in7_alarm.dev_attr.attr,
446
447 &sensor_dev_attr_temp1_input.dev_attr.attr,
448 &sensor_dev_attr_temp1_max.dev_attr.attr,
449 &sensor_dev_attr_temp1_min.dev_attr.attr,
450 &sensor_dev_attr_temp1_offset.dev_attr.attr,
451 &sensor_dev_attr_temp1_alarm.dev_attr.attr,
452 &sensor_dev_attr_temp2_input.dev_attr.attr,
453 &sensor_dev_attr_temp2_max.dev_attr.attr,
454 &sensor_dev_attr_temp2_min.dev_attr.attr,
455 &sensor_dev_attr_temp2_offset.dev_attr.attr,
456 &sensor_dev_attr_temp2_alarm.dev_attr.attr,
457 &sensor_dev_attr_temp2_fault.dev_attr.attr,
458 &sensor_dev_attr_temp3_input.dev_attr.attr,
459 &sensor_dev_attr_temp3_max.dev_attr.attr,
460 &sensor_dev_attr_temp3_min.dev_attr.attr,
461 &sensor_dev_attr_temp3_offset.dev_attr.attr,
462 &sensor_dev_attr_temp3_alarm.dev_attr.attr,
463 &sensor_dev_attr_temp3_fault.dev_attr.attr,
464
465 &dev_attr_cpu0_vid.attr,
466 &dev_attr_vrm.attr,
467 NULL
468};
469
470static const struct attribute_group smsc47m192_group = {
471 .attrs = smsc47m192_attributes,
472};
473
474static struct attribute *smsc47m192_attributes_in4[] = {
475 &sensor_dev_attr_in4_input.dev_attr.attr,
476 &sensor_dev_attr_in4_min.dev_attr.attr,
477 &sensor_dev_attr_in4_max.dev_attr.attr,
478 &sensor_dev_attr_in4_alarm.dev_attr.attr,
479 NULL
480};
481
482static const struct attribute_group smsc47m192_group_in4 = {
483 .attrs = smsc47m192_attributes_in4,
484};
485
486static void smsc47m192_init_client(struct i2c_client *client)
487{
488 int i;
489 u8 config = i2c_smbus_read_byte_data(client, SMSC47M192_REG_CONFIG);
490 u8 sfr = i2c_smbus_read_byte_data(client, SMSC47M192_REG_SFR);
491
492 /* select cycle mode (pause 1 sec between updates) */
493 i2c_smbus_write_byte_data(client, SMSC47M192_REG_SFR,
494 (sfr & 0xfd) | 0x02);
495 if (!(config & 0x01)) {
496 /* initialize alarm limits */
497 for (i = 0; i < 8; i++) {
498 i2c_smbus_write_byte_data(client,
499 SMSC47M192_REG_IN_MIN(i), 0);
500 i2c_smbus_write_byte_data(client,
501 SMSC47M192_REG_IN_MAX(i), 0xff);
502 }
503 for (i = 0; i < 3; i++) {
504 i2c_smbus_write_byte_data(client,
505 SMSC47M192_REG_TEMP_MIN[i], 0x80);
506 i2c_smbus_write_byte_data(client,
507 SMSC47M192_REG_TEMP_MAX[i], 0x7f);
508 }
509
510 /* start monitoring */
511 i2c_smbus_write_byte_data(client, SMSC47M192_REG_CONFIG,
512 (config & 0xf7) | 0x01);
513 }
514}
515
516/* Return 0 if detection is successful, -ENODEV otherwise */
517static int smsc47m192_detect(struct i2c_client *client,
518 struct i2c_board_info *info)
519{
520 struct i2c_adapter *adapter = client->adapter;
521 int version;
522
523 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
524 return -ENODEV;
525
526 /* Detection criteria from sensors_detect script */
527 version = i2c_smbus_read_byte_data(client, SMSC47M192_REG_VERSION);
528 if (i2c_smbus_read_byte_data(client,
529 SMSC47M192_REG_COMPANY_ID) == 0x55
530 && (version & 0xf0) == 0x20
531 && (i2c_smbus_read_byte_data(client,
532 SMSC47M192_REG_VID) & 0x70) == 0x00
533 && (i2c_smbus_read_byte_data(client,
534 SMSC47M192_REG_VID4) & 0xfe) == 0x80) {
535 dev_info(&adapter->dev,
536 "found SMSC47M192 or compatible, "
537 "version 2, stepping A%d\n", version & 0x0f);
538 } else {
539 dev_dbg(&adapter->dev,
540 "SMSC47M192 detection failed at 0x%02x\n",
541 client->addr);
542 return -ENODEV;
543 }
544
545 strlcpy(info->type, "smsc47m192", I2C_NAME_SIZE);
546
547 return 0;
548}
549
550static int smsc47m192_probe(struct i2c_client *client,
551 const struct i2c_device_id *id)
552{
553 struct smsc47m192_data *data;
554 int config;
555 int err;
556
557 data = kzalloc(sizeof(struct smsc47m192_data), GFP_KERNEL);
558 if (!data) {
559 err = -ENOMEM;
560 goto exit;
561 }
562
563 i2c_set_clientdata(client, data);
564 data->vrm = vid_which_vrm();
565 mutex_init(&data->update_lock);
566
567 /* Initialize the SMSC47M192 chip */
568 smsc47m192_init_client(client);
569
570 /* Register sysfs hooks */
571 err = sysfs_create_group(&client->dev.kobj, &smsc47m192_group);
572 if (err)
573 goto exit_free;
574
575 /* Pin 110 is either in4 (+12V) or VID4 */
576 config = i2c_smbus_read_byte_data(client, SMSC47M192_REG_CONFIG);
577 if (!(config & 0x20)) {
578 err = sysfs_create_group(&client->dev.kobj,
579 &smsc47m192_group_in4);
580 if (err)
581 goto exit_remove_files;
582 }
583
584 data->hwmon_dev = hwmon_device_register(&client->dev);
585 if (IS_ERR(data->hwmon_dev)) {
586 err = PTR_ERR(data->hwmon_dev);
587 goto exit_remove_files;
588 }
589
590 return 0;
591
592exit_remove_files:
593 sysfs_remove_group(&client->dev.kobj, &smsc47m192_group);
594 sysfs_remove_group(&client->dev.kobj, &smsc47m192_group_in4);
595exit_free:
596 kfree(data);
597exit:
598 return err;
599}
600
601static int smsc47m192_remove(struct i2c_client *client)
602{
603 struct smsc47m192_data *data = i2c_get_clientdata(client);
604
605 hwmon_device_unregister(data->hwmon_dev);
606 sysfs_remove_group(&client->dev.kobj, &smsc47m192_group);
607 sysfs_remove_group(&client->dev.kobj, &smsc47m192_group_in4);
608
609 kfree(data);
610
611 return 0;
612}
613
614static struct smsc47m192_data *smsc47m192_update_device(struct device *dev)
615{
616 struct i2c_client *client = to_i2c_client(dev);
617 struct smsc47m192_data *data = i2c_get_clientdata(client);
618 int i, config;
619
620 mutex_lock(&data->update_lock);
621
622 if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
623 || !data->valid) {
624 u8 sfr = i2c_smbus_read_byte_data(client, SMSC47M192_REG_SFR);
625
626 dev_dbg(&client->dev, "Starting smsc47m192 update\n");
627
628 for (i = 0; i <= 7; i++) {
629 data->in[i] = i2c_smbus_read_byte_data(client,
630 SMSC47M192_REG_IN(i));
631 data->in_min[i] = i2c_smbus_read_byte_data(client,
632 SMSC47M192_REG_IN_MIN(i));
633 data->in_max[i] = i2c_smbus_read_byte_data(client,
634 SMSC47M192_REG_IN_MAX(i));
635 }
636 for (i = 0; i < 3; i++) {
637 data->temp[i] = i2c_smbus_read_byte_data(client,
638 SMSC47M192_REG_TEMP[i]);
639 data->temp_max[i] = i2c_smbus_read_byte_data(client,
640 SMSC47M192_REG_TEMP_MAX[i]);
641 data->temp_min[i] = i2c_smbus_read_byte_data(client,
642 SMSC47M192_REG_TEMP_MIN[i]);
643 }
644 for (i = 1; i < 3; i++)
645 data->temp_offset[i] = i2c_smbus_read_byte_data(client,
646 SMSC47M192_REG_TEMP_OFFSET(i));
647 /*
648 * first offset is temp_offset[0] if SFR bit 4 is set,
649 * temp_offset[1] otherwise
650 */
651 if (sfr & 0x10) {
652 data->temp_offset[0] = data->temp_offset[1];
653 data->temp_offset[1] = 0;
654 } else
655 data->temp_offset[0] = 0;
656
657 data->vid = i2c_smbus_read_byte_data(client, SMSC47M192_REG_VID)
658 & 0x0f;
659 config = i2c_smbus_read_byte_data(client,
660 SMSC47M192_REG_CONFIG);
661 if (config & 0x20)
662 data->vid |= (i2c_smbus_read_byte_data(client,
663 SMSC47M192_REG_VID4) & 0x01) << 4;
664 data->alarms = i2c_smbus_read_byte_data(client,
665 SMSC47M192_REG_ALARM1) |
666 (i2c_smbus_read_byte_data(client,
667 SMSC47M192_REG_ALARM2) << 8);
668
669 data->last_updated = jiffies;
670 data->valid = 1;
671 }
672
673 mutex_unlock(&data->update_lock);
674
675 return data;
676}
677
678module_i2c_driver(smsc47m192_driver);
679
680MODULE_AUTHOR("Hartmut Rick <linux@rick.claranet.de>");
681MODULE_DESCRIPTION("SMSC47M192 driver");
682MODULE_LICENSE("GPL");