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smsc47m192.c
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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 <[email protected]>
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 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  */
87 static inline s8 TEMP_TO_REG(int val)
88 {
89  return SENSORS_LIMIT(SCALE(val, 1, 1000), -128000, 127000);
90 }
91 
92 static inline int TEMP_FROM_REG(s8 val)
93 {
94  return val * 1000;
95 }
96 
97 struct 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 
115 static int smsc47m192_probe(struct i2c_client *client,
116  const struct i2c_device_id *id);
117 static int smsc47m192_detect(struct i2c_client *client,
118  struct i2c_board_info *info);
119 static int smsc47m192_remove(struct i2c_client *client);
120 static struct smsc47m192_data *smsc47m192_update_device(struct device *dev);
121 
122 static const struct i2c_device_id smsc47m192_id[] = {
123  { "smsc47m192", 0 },
124  { }
125 };
126 MODULE_DEVICE_TABLE(i2c, smsc47m192_id);
127 
128 static 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 */
141 static 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 
150 static 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 
159 static 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 
168 static 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 
190 static 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) \
213 static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO, \
214  show_in, NULL, offset); \
215 static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \
216  show_in_min, set_in_min, offset); \
217 static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \
218  show_in_max, set_in_max, offset);
219 
220 show_in_offset(0)
221 show_in_offset(1)
222 show_in_offset(2)
223 show_in_offset(3)
224 show_in_offset(4)
225 show_in_offset(5)
226 show_in_offset(6)
227 show_in_offset(7)
228 
229 /* Temperatures */
230 static 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 
239 static 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 
248 static 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 
257 static 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 
279 static 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 
301 static 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 
310 static 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) \
348 static SENSOR_DEVICE_ATTR(temp##index##_input, S_IRUGO, \
349  show_temp, NULL, index-1); \
350 static SENSOR_DEVICE_ATTR(temp##index##_min, S_IRUGO | S_IWUSR, \
351  show_temp_min, set_temp_min, index-1); \
352 static SENSOR_DEVICE_ATTR(temp##index##_max, S_IRUGO | S_IWUSR, \
353  show_temp_max, set_temp_max, index-1); \
354 static SENSOR_DEVICE_ATTR(temp##index##_offset, S_IRUGO | S_IWUSR, \
355  show_temp_offset, set_temp_offset, index-1);
356 
357 show_temp_index(1)
358 show_temp_index(2)
359 show_temp_index(3)
360 
361 /* VID */
362 static 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 }
368 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
369 
370 static 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 
377 static 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 }
391 static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm, set_vrm);
392 
393 /* Alarms */
394 static 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 
403 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 0x0010);
404 static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 0x0020);
405 static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 0x0040);
406 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 0x4000);
407 static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 0x8000);
408 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0x0001);
409 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 0x0002);
410 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 0x0004);
411 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 0x0008);
412 static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 0x0100);
413 static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 0x0200);
414 static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 0x0400);
415 static SENSOR_DEVICE_ATTR(in7_alarm, S_IRUGO, show_alarm, NULL, 0x0800);
416 
417 static 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 
470 static const struct attribute_group smsc47m192_group = {
471  .attrs = smsc47m192_attributes,
472 };
473 
474 static 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 
482 static const struct attribute_group smsc47m192_group_in4 = {
483  .attrs = smsc47m192_attributes_in4,
484 };
485 
486 static 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 */
517 static 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 
550 static 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 = devm_kzalloc(&client->dev, sizeof(struct smsc47m192_data),
558  GFP_KERNEL);
559  if (!data)
560  return -ENOMEM;
561 
562  i2c_set_clientdata(client, data);
563  data->vrm = vid_which_vrm();
564  mutex_init(&data->update_lock);
565 
566  /* Initialize the SMSC47M192 chip */
567  smsc47m192_init_client(client);
568 
569  /* Register sysfs hooks */
570  err = sysfs_create_group(&client->dev.kobj, &smsc47m192_group);
571  if (err)
572  return err;
573 
574  /* Pin 110 is either in4 (+12V) or VID4 */
575  config = i2c_smbus_read_byte_data(client, SMSC47M192_REG_CONFIG);
576  if (!(config & 0x20)) {
577  err = sysfs_create_group(&client->dev.kobj,
578  &smsc47m192_group_in4);
579  if (err)
580  goto exit_remove_files;
581  }
582 
583  data->hwmon_dev = hwmon_device_register(&client->dev);
584  if (IS_ERR(data->hwmon_dev)) {
585  err = PTR_ERR(data->hwmon_dev);
586  goto exit_remove_files;
587  }
588 
589  return 0;
590 
591 exit_remove_files:
592  sysfs_remove_group(&client->dev.kobj, &smsc47m192_group);
593  sysfs_remove_group(&client->dev.kobj, &smsc47m192_group_in4);
594  return err;
595 }
596 
597 static int smsc47m192_remove(struct i2c_client *client)
598 {
599  struct smsc47m192_data *data = i2c_get_clientdata(client);
600 
601  hwmon_device_unregister(data->hwmon_dev);
602  sysfs_remove_group(&client->dev.kobj, &smsc47m192_group);
603  sysfs_remove_group(&client->dev.kobj, &smsc47m192_group_in4);
604 
605  return 0;
606 }
607 
608 static struct smsc47m192_data *smsc47m192_update_device(struct device *dev)
609 {
610  struct i2c_client *client = to_i2c_client(dev);
611  struct smsc47m192_data *data = i2c_get_clientdata(client);
612  int i, config;
613 
614  mutex_lock(&data->update_lock);
615 
616  if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
617  || !data->valid) {
618  u8 sfr = i2c_smbus_read_byte_data(client, SMSC47M192_REG_SFR);
619 
620  dev_dbg(&client->dev, "Starting smsc47m192 update\n");
621 
622  for (i = 0; i <= 7; i++) {
623  data->in[i] = i2c_smbus_read_byte_data(client,
624  SMSC47M192_REG_IN(i));
625  data->in_min[i] = i2c_smbus_read_byte_data(client,
626  SMSC47M192_REG_IN_MIN(i));
627  data->in_max[i] = i2c_smbus_read_byte_data(client,
628  SMSC47M192_REG_IN_MAX(i));
629  }
630  for (i = 0; i < 3; i++) {
631  data->temp[i] = i2c_smbus_read_byte_data(client,
632  SMSC47M192_REG_TEMP[i]);
633  data->temp_max[i] = i2c_smbus_read_byte_data(client,
634  SMSC47M192_REG_TEMP_MAX[i]);
635  data->temp_min[i] = i2c_smbus_read_byte_data(client,
636  SMSC47M192_REG_TEMP_MIN[i]);
637  }
638  for (i = 1; i < 3; i++)
639  data->temp_offset[i] = i2c_smbus_read_byte_data(client,
640  SMSC47M192_REG_TEMP_OFFSET(i));
641  /*
642  * first offset is temp_offset[0] if SFR bit 4 is set,
643  * temp_offset[1] otherwise
644  */
645  if (sfr & 0x10) {
646  data->temp_offset[0] = data->temp_offset[1];
647  data->temp_offset[1] = 0;
648  } else
649  data->temp_offset[0] = 0;
650 
651  data->vid = i2c_smbus_read_byte_data(client, SMSC47M192_REG_VID)
652  & 0x0f;
653  config = i2c_smbus_read_byte_data(client,
654  SMSC47M192_REG_CONFIG);
655  if (config & 0x20)
656  data->vid |= (i2c_smbus_read_byte_data(client,
657  SMSC47M192_REG_VID4) & 0x01) << 4;
658  data->alarms = i2c_smbus_read_byte_data(client,
659  SMSC47M192_REG_ALARM1) |
660  (i2c_smbus_read_byte_data(client,
661  SMSC47M192_REG_ALARM2) << 8);
662 
663  data->last_updated = jiffies;
664  data->valid = 1;
665  }
666 
667  mutex_unlock(&data->update_lock);
668 
669  return data;
670 }
671 
672 module_i2c_driver(smsc47m192_driver);
673 
674 MODULE_AUTHOR("Hartmut Rick <[email protected]>");
675 MODULE_DESCRIPTION("SMSC47M192 driver");
676 MODULE_LICENSE("GPL");
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