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lm87.c
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1 /*
2  * lm87.c
3  *
4  * Copyright (C) 2000 Frodo Looijaard <[email protected]>
5  * Philip Edelbrock <[email protected]>
6  * Stephen Rousset <[email protected]>
7  * Dan Eaton <[email protected]>
8  * Copyright (C) 2004-2008 Jean Delvare <[email protected]>
9  *
10  * Original port to Linux 2.6 by Jeff Oliver.
11  *
12  * The LM87 is a sensor chip made by National Semiconductor. It monitors up
13  * to 8 voltages (including its own power source), up to three temperatures
14  * (its own plus up to two external ones) and up to two fans. The default
15  * configuration is 6 voltages, two temperatures and two fans (see below).
16  * Voltages are scaled internally with ratios such that the nominal value of
17  * each voltage correspond to a register value of 192 (which means a
18  * resolution of about 0.5% of the nominal value). Temperature values are
19  * reported with a 1 deg resolution and a 3-4 deg accuracy. Complete
20  * datasheet can be obtained from National's website at:
21  * http://www.national.com/pf/LM/LM87.html
22  *
23  * Some functions share pins, so not all functions are available at the same
24  * time. Which are depends on the hardware setup. This driver normally
25  * assumes that firmware configured the chip correctly. Where this is not
26  * the case, platform code must set the I2C client's platform_data to point
27  * to a u8 value to be written to the channel register.
28  * For reference, here is the list of exclusive functions:
29  * - in0+in5 (default) or temp3
30  * - fan1 (default) or in6
31  * - fan2 (default) or in7
32  * - VID lines (default) or IRQ lines (not handled by this driver)
33  *
34  * The LM87 additionally features an analog output, supposedly usable to
35  * control the speed of a fan. All new chips use pulse width modulation
36  * instead. The LM87 is the only hardware monitoring chipset I know of
37  * which uses amplitude modulation. Be careful when using this feature.
38  *
39  * This driver also supports the ADM1024, a sensor chip made by Analog
40  * Devices. That chip is fully compatible with the LM87. Complete
41  * datasheet can be obtained from Analog's website at:
42  * http://www.analog.com/en/prod/0,2877,ADM1024,00.html
43  *
44  * This program is free software; you can redistribute it and/or modify
45  * it under the terms of the GNU General Public License as published by
46  * the Free Software Foundation; either version 2 of the License, or
47  * (at your option) any later version.
48  *
49  * This program is distributed in the hope that it will be useful,
50  * but WITHOUT ANY WARRANTY; without even the implied warranty of
51  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
52  * GNU General Public License for more details.
53  *
54  * You should have received a copy of the GNU General Public License
55  * along with this program; if not, write to the Free Software
56  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
57  */
58 
59 #include <linux/module.h>
60 #include <linux/init.h>
61 #include <linux/slab.h>
62 #include <linux/jiffies.h>
63 #include <linux/i2c.h>
64 #include <linux/hwmon.h>
65 #include <linux/hwmon-sysfs.h>
66 #include <linux/hwmon-vid.h>
67 #include <linux/err.h>
68 #include <linux/mutex.h>
69 
70 /*
71  * Addresses to scan
72  * LM87 has three possible addresses: 0x2c, 0x2d and 0x2e.
73  */
74 
75 static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };
76 
77 enum chips { lm87, adm1024 };
78 
79 /*
80  * The LM87 registers
81  */
82 
83 /* nr in 0..5 */
84 #define LM87_REG_IN(nr) (0x20 + (nr))
85 #define LM87_REG_IN_MAX(nr) (0x2B + (nr) * 2)
86 #define LM87_REG_IN_MIN(nr) (0x2C + (nr) * 2)
87 /* nr in 0..1 */
88 #define LM87_REG_AIN(nr) (0x28 + (nr))
89 #define LM87_REG_AIN_MIN(nr) (0x1A + (nr))
90 #define LM87_REG_AIN_MAX(nr) (0x3B + (nr))
91 
92 static u8 LM87_REG_TEMP[3] = { 0x27, 0x26, 0x20 };
93 static u8 LM87_REG_TEMP_HIGH[3] = { 0x39, 0x37, 0x2B };
94 static u8 LM87_REG_TEMP_LOW[3] = { 0x3A, 0x38, 0x2C };
95 
96 #define LM87_REG_TEMP_HW_INT_LOCK 0x13
97 #define LM87_REG_TEMP_HW_EXT_LOCK 0x14
98 #define LM87_REG_TEMP_HW_INT 0x17
99 #define LM87_REG_TEMP_HW_EXT 0x18
100 
101 /* nr in 0..1 */
102 #define LM87_REG_FAN(nr) (0x28 + (nr))
103 #define LM87_REG_FAN_MIN(nr) (0x3B + (nr))
104 #define LM87_REG_AOUT 0x19
105 
106 #define LM87_REG_CONFIG 0x40
107 #define LM87_REG_CHANNEL_MODE 0x16
108 #define LM87_REG_VID_FAN_DIV 0x47
109 #define LM87_REG_VID4 0x49
110 
111 #define LM87_REG_ALARMS1 0x41
112 #define LM87_REG_ALARMS2 0x42
113 
114 #define LM87_REG_COMPANY_ID 0x3E
115 #define LM87_REG_REVISION 0x3F
116 
117 /*
118  * Conversions and various macros
119  * The LM87 uses signed 8-bit values for temperatures.
120  */
121 
122 #define IN_FROM_REG(reg, scale) (((reg) * (scale) + 96) / 192)
123 #define IN_TO_REG(val, scale) ((val) <= 0 ? 0 : \
124  (val) * 192 >= (scale) * 255 ? 255 : \
125  ((val) * 192 + (scale) / 2) / (scale))
126 
127 #define TEMP_FROM_REG(reg) ((reg) * 1000)
128 #define TEMP_TO_REG(val) ((val) <= -127500 ? -128 : \
129  (val) >= 126500 ? 127 : \
130  (((val) < 0 ? (val) - 500 : \
131  (val) + 500) / 1000))
132 
133 #define FAN_FROM_REG(reg, div) ((reg) == 255 || (reg) == 0 ? 0 : \
134  (1350000 + (reg)*(div) / 2) / ((reg) * (div)))
135 #define FAN_TO_REG(val, div) ((val) * (div) * 255 <= 1350000 ? 255 : \
136  (1350000 + (val)*(div) / 2) / ((val) * (div)))
137 
138 #define FAN_DIV_FROM_REG(reg) (1 << (reg))
139 
140 /* analog out is 9.80mV/LSB */
141 #define AOUT_FROM_REG(reg) (((reg) * 98 + 5) / 10)
142 #define AOUT_TO_REG(val) ((val) <= 0 ? 0 : \
143  (val) >= 2500 ? 255 : \
144  ((val) * 10 + 49) / 98)
145 
146 /* nr in 0..1 */
147 #define CHAN_NO_FAN(nr) (1 << (nr))
148 #define CHAN_TEMP3 (1 << 2)
149 #define CHAN_VCC_5V (1 << 3)
150 #define CHAN_NO_VID (1 << 7)
151 
152 /*
153  * Client data (each client gets its own)
154  */
155 
156 struct lm87_data {
157  struct device *hwmon_dev;
159  char valid; /* zero until following fields are valid */
160  unsigned long last_updated; /* In jiffies */
161 
162  u8 channel; /* register value */
163  u8 config; /* original register value */
164 
165  u8 in[8]; /* register value */
166  u8 in_max[8]; /* register value */
167  u8 in_min[8]; /* register value */
169 
170  s8 temp[3]; /* register value */
171  s8 temp_high[3]; /* register value */
172  s8 temp_low[3]; /* register value */
173  s8 temp_crit_int; /* min of two register values */
174  s8 temp_crit_ext; /* min of two register values */
175 
176  u8 fan[2]; /* register value */
177  u8 fan_min[2]; /* register value */
178  u8 fan_div[2]; /* register value, shifted right */
179  u8 aout; /* register value */
180 
181  u16 alarms; /* register values, combined */
182  u8 vid; /* register values, combined */
184 };
185 
186 static inline int lm87_read_value(struct i2c_client *client, u8 reg)
187 {
188  return i2c_smbus_read_byte_data(client, reg);
189 }
190 
191 static inline int lm87_write_value(struct i2c_client *client, u8 reg, u8 value)
192 {
193  return i2c_smbus_write_byte_data(client, reg, value);
194 }
195 
196 static struct lm87_data *lm87_update_device(struct device *dev)
197 {
198  struct i2c_client *client = to_i2c_client(dev);
199  struct lm87_data *data = i2c_get_clientdata(client);
200 
201  mutex_lock(&data->update_lock);
202 
203  if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
204  int i, j;
205 
206  dev_dbg(&client->dev, "Updating data.\n");
207 
208  i = (data->channel & CHAN_TEMP3) ? 1 : 0;
209  j = (data->channel & CHAN_TEMP3) ? 5 : 6;
210  for (; i < j; i++) {
211  data->in[i] = lm87_read_value(client,
212  LM87_REG_IN(i));
213  data->in_min[i] = lm87_read_value(client,
214  LM87_REG_IN_MIN(i));
215  data->in_max[i] = lm87_read_value(client,
216  LM87_REG_IN_MAX(i));
217  }
218 
219  for (i = 0; i < 2; i++) {
220  if (data->channel & CHAN_NO_FAN(i)) {
221  data->in[6+i] = lm87_read_value(client,
222  LM87_REG_AIN(i));
223  data->in_max[6+i] = lm87_read_value(client,
224  LM87_REG_AIN_MAX(i));
225  data->in_min[6+i] = lm87_read_value(client,
226  LM87_REG_AIN_MIN(i));
227 
228  } else {
229  data->fan[i] = lm87_read_value(client,
230  LM87_REG_FAN(i));
231  data->fan_min[i] = lm87_read_value(client,
232  LM87_REG_FAN_MIN(i));
233  }
234  }
235 
236  j = (data->channel & CHAN_TEMP3) ? 3 : 2;
237  for (i = 0 ; i < j; i++) {
238  data->temp[i] = lm87_read_value(client,
239  LM87_REG_TEMP[i]);
240  data->temp_high[i] = lm87_read_value(client,
241  LM87_REG_TEMP_HIGH[i]);
242  data->temp_low[i] = lm87_read_value(client,
243  LM87_REG_TEMP_LOW[i]);
244  }
245 
246  i = lm87_read_value(client, LM87_REG_TEMP_HW_INT_LOCK);
247  j = lm87_read_value(client, LM87_REG_TEMP_HW_INT);
248  data->temp_crit_int = min(i, j);
249 
250  i = lm87_read_value(client, LM87_REG_TEMP_HW_EXT_LOCK);
251  j = lm87_read_value(client, LM87_REG_TEMP_HW_EXT);
252  data->temp_crit_ext = min(i, j);
253 
254  i = lm87_read_value(client, LM87_REG_VID_FAN_DIV);
255  data->fan_div[0] = (i >> 4) & 0x03;
256  data->fan_div[1] = (i >> 6) & 0x03;
257  data->vid = (i & 0x0F)
258  | (lm87_read_value(client, LM87_REG_VID4) & 0x01)
259  << 4;
260 
261  data->alarms = lm87_read_value(client, LM87_REG_ALARMS1)
262  | (lm87_read_value(client, LM87_REG_ALARMS2)
263  << 8);
264  data->aout = lm87_read_value(client, LM87_REG_AOUT);
265 
266  data->last_updated = jiffies;
267  data->valid = 1;
268  }
269 
270  mutex_unlock(&data->update_lock);
271 
272  return data;
273 }
274 
275 /*
276  * Sysfs stuff
277  */
278 
279 static ssize_t show_in_input(struct device *dev, struct device_attribute *attr,
280  char *buf)
281 {
282  struct lm87_data *data = lm87_update_device(dev);
283  int nr = to_sensor_dev_attr(attr)->index;
284 
285  return sprintf(buf, "%u\n", IN_FROM_REG(data->in[nr],
286  data->in_scale[nr]));
287 }
288 
289 static ssize_t show_in_min(struct device *dev,
290  struct device_attribute *attr, char *buf)
291 {
292  struct lm87_data *data = lm87_update_device(dev);
293  int nr = to_sensor_dev_attr(attr)->index;
294 
295  return sprintf(buf, "%u\n", IN_FROM_REG(data->in_min[nr],
296  data->in_scale[nr]));
297 }
298 
299 static ssize_t show_in_max(struct device *dev,
300  struct device_attribute *attr, char *buf)
301 {
302  struct lm87_data *data = lm87_update_device(dev);
303  int nr = to_sensor_dev_attr(attr)->index;
304 
305  return sprintf(buf, "%u\n", IN_FROM_REG(data->in_max[nr],
306  data->in_scale[nr]));
307 }
308 
309 static ssize_t set_in_min(struct device *dev, struct device_attribute *attr,
310  const char *buf, size_t count)
311 {
312  struct i2c_client *client = to_i2c_client(dev);
313  struct lm87_data *data = i2c_get_clientdata(client);
314  int nr = to_sensor_dev_attr(attr)->index;
315  long val;
316  int err;
317 
318  err = kstrtol(buf, 10, &val);
319  if (err)
320  return err;
321 
322  mutex_lock(&data->update_lock);
323  data->in_min[nr] = IN_TO_REG(val, data->in_scale[nr]);
324  lm87_write_value(client, nr < 6 ? LM87_REG_IN_MIN(nr) :
325  LM87_REG_AIN_MIN(nr - 6), data->in_min[nr]);
326  mutex_unlock(&data->update_lock);
327  return count;
328 }
329 
330 static ssize_t set_in_max(struct device *dev, struct device_attribute *attr,
331  const char *buf, size_t count)
332 {
333  struct i2c_client *client = to_i2c_client(dev);
334  struct lm87_data *data = i2c_get_clientdata(client);
335  int nr = to_sensor_dev_attr(attr)->index;
336  long val;
337  int err;
338 
339  err = kstrtol(buf, 10, &val);
340  if (err)
341  return err;
342 
343  mutex_lock(&data->update_lock);
344  data->in_max[nr] = IN_TO_REG(val, data->in_scale[nr]);
345  lm87_write_value(client, nr < 6 ? LM87_REG_IN_MAX(nr) :
346  LM87_REG_AIN_MAX(nr - 6), data->in_max[nr]);
347  mutex_unlock(&data->update_lock);
348  return count;
349 }
350 
351 #define set_in(offset) \
352 static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO, \
353  show_in_input, NULL, offset); \
354 static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \
355  show_in_min, set_in_min, offset); \
356 static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \
357  show_in_max, set_in_max, offset)
358 set_in(0);
359 set_in(1);
360 set_in(2);
361 set_in(3);
362 set_in(4);
363 set_in(5);
364 set_in(6);
365 set_in(7);
366 
367 static ssize_t show_temp_input(struct device *dev,
368  struct device_attribute *attr, char *buf)
369 {
370  struct lm87_data *data = lm87_update_device(dev);
371  int nr = to_sensor_dev_attr(attr)->index;
372 
373  return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr]));
374 }
375 
376 static ssize_t show_temp_low(struct device *dev,
377  struct device_attribute *attr, char *buf)
378 {
379  struct lm87_data *data = lm87_update_device(dev);
380  int nr = to_sensor_dev_attr(attr)->index;
381 
382  return sprintf(buf, "%d\n",
383  TEMP_FROM_REG(data->temp_low[nr]));
384 }
385 
386 static ssize_t show_temp_high(struct device *dev,
387  struct device_attribute *attr, char *buf)
388 {
389  struct lm87_data *data = lm87_update_device(dev);
390  int nr = to_sensor_dev_attr(attr)->index;
391 
392  return sprintf(buf, "%d\n",
393  TEMP_FROM_REG(data->temp_high[nr]));
394 }
395 
396 static ssize_t set_temp_low(struct device *dev, struct device_attribute *attr,
397  const char *buf, size_t count)
398 {
399  struct i2c_client *client = to_i2c_client(dev);
400  struct lm87_data *data = i2c_get_clientdata(client);
401  int nr = to_sensor_dev_attr(attr)->index;
402  long val;
403  int err;
404 
405  err = kstrtol(buf, 10, &val);
406  if (err)
407  return err;
408 
409  mutex_lock(&data->update_lock);
410  data->temp_low[nr] = TEMP_TO_REG(val);
411  lm87_write_value(client, LM87_REG_TEMP_LOW[nr], data->temp_low[nr]);
412  mutex_unlock(&data->update_lock);
413  return count;
414 }
415 
416 static ssize_t set_temp_high(struct device *dev, struct device_attribute *attr,
417  const char *buf, size_t count)
418 {
419  struct i2c_client *client = to_i2c_client(dev);
420  struct lm87_data *data = i2c_get_clientdata(client);
421  int nr = to_sensor_dev_attr(attr)->index;
422  long val;
423  int err;
424 
425  err = kstrtol(buf, 10, &val);
426  if (err)
427  return err;
428 
429  mutex_lock(&data->update_lock);
430  data->temp_high[nr] = TEMP_TO_REG(val);
431  lm87_write_value(client, LM87_REG_TEMP_HIGH[nr], data->temp_high[nr]);
432  mutex_unlock(&data->update_lock);
433  return count;
434 }
435 
436 #define set_temp(offset) \
437 static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO, \
438  show_temp_input, NULL, offset - 1); \
439 static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR, \
440  show_temp_high, set_temp_high, offset - 1); \
441 static SENSOR_DEVICE_ATTR(temp##offset##_min, S_IRUGO | S_IWUSR, \
442  show_temp_low, set_temp_low, offset - 1)
443 set_temp(1);
444 set_temp(2);
445 set_temp(3);
446 
447 static ssize_t show_temp_crit_int(struct device *dev,
448  struct device_attribute *attr, char *buf)
449 {
450  struct lm87_data *data = lm87_update_device(dev);
451  return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_crit_int));
452 }
453 
454 static ssize_t show_temp_crit_ext(struct device *dev,
455  struct device_attribute *attr, char *buf)
456 {
457  struct lm87_data *data = lm87_update_device(dev);
458  return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_crit_ext));
459 }
460 
461 static DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp_crit_int, NULL);
462 static DEVICE_ATTR(temp2_crit, S_IRUGO, show_temp_crit_ext, NULL);
463 static DEVICE_ATTR(temp3_crit, S_IRUGO, show_temp_crit_ext, NULL);
464 
465 static ssize_t show_fan_input(struct device *dev,
466  struct device_attribute *attr, char *buf)
467 {
468  struct lm87_data *data = lm87_update_device(dev);
469  int nr = to_sensor_dev_attr(attr)->index;
470 
471  return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
472  FAN_DIV_FROM_REG(data->fan_div[nr])));
473 }
474 
475 static ssize_t show_fan_min(struct device *dev,
476  struct device_attribute *attr, char *buf)
477 {
478  struct lm87_data *data = lm87_update_device(dev);
479  int nr = to_sensor_dev_attr(attr)->index;
480 
481  return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr],
482  FAN_DIV_FROM_REG(data->fan_div[nr])));
483 }
484 
485 static ssize_t show_fan_div(struct device *dev,
486  struct device_attribute *attr, char *buf)
487 {
488  struct lm87_data *data = lm87_update_device(dev);
489  int nr = to_sensor_dev_attr(attr)->index;
490 
491  return sprintf(buf, "%d\n",
492  FAN_DIV_FROM_REG(data->fan_div[nr]));
493 }
494 
495 static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr,
496  const char *buf, size_t count)
497 {
498  struct i2c_client *client = to_i2c_client(dev);
499  struct lm87_data *data = i2c_get_clientdata(client);
500  int nr = to_sensor_dev_attr(attr)->index;
501  long val;
502  int err;
503 
504  err = kstrtol(buf, 10, &val);
505  if (err)
506  return err;
507 
508  mutex_lock(&data->update_lock);
509  data->fan_min[nr] = FAN_TO_REG(val,
510  FAN_DIV_FROM_REG(data->fan_div[nr]));
511  lm87_write_value(client, LM87_REG_FAN_MIN(nr), data->fan_min[nr]);
512  mutex_unlock(&data->update_lock);
513  return count;
514 }
515 
516 /*
517  * Note: we save and restore the fan minimum here, because its value is
518  * determined in part by the fan clock divider. This follows the principle
519  * of least surprise; the user doesn't expect the fan minimum to change just
520  * because the divider changed.
521  */
522 static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
523  const char *buf, size_t count)
524 {
525  struct i2c_client *client = to_i2c_client(dev);
526  struct lm87_data *data = i2c_get_clientdata(client);
527  int nr = to_sensor_dev_attr(attr)->index;
528  long val;
529  int err;
530  unsigned long min;
531  u8 reg;
532 
533  err = kstrtol(buf, 10, &val);
534  if (err)
535  return err;
536 
537  mutex_lock(&data->update_lock);
538  min = FAN_FROM_REG(data->fan_min[nr],
539  FAN_DIV_FROM_REG(data->fan_div[nr]));
540 
541  switch (val) {
542  case 1:
543  data->fan_div[nr] = 0;
544  break;
545  case 2:
546  data->fan_div[nr] = 1;
547  break;
548  case 4:
549  data->fan_div[nr] = 2;
550  break;
551  case 8:
552  data->fan_div[nr] = 3;
553  break;
554  default:
555  mutex_unlock(&data->update_lock);
556  return -EINVAL;
557  }
558 
559  reg = lm87_read_value(client, LM87_REG_VID_FAN_DIV);
560  switch (nr) {
561  case 0:
562  reg = (reg & 0xCF) | (data->fan_div[0] << 4);
563  break;
564  case 1:
565  reg = (reg & 0x3F) | (data->fan_div[1] << 6);
566  break;
567  }
568  lm87_write_value(client, LM87_REG_VID_FAN_DIV, reg);
569 
570  data->fan_min[nr] = FAN_TO_REG(min, val);
571  lm87_write_value(client, LM87_REG_FAN_MIN(nr),
572  data->fan_min[nr]);
573  mutex_unlock(&data->update_lock);
574 
575  return count;
576 }
577 
578 #define set_fan(offset) \
579 static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO, \
580  show_fan_input, NULL, offset - 1); \
581 static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
582  show_fan_min, set_fan_min, offset - 1); \
583 static SENSOR_DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR, \
584  show_fan_div, set_fan_div, offset - 1)
585 set_fan(1);
586 set_fan(2);
587 
588 static ssize_t show_alarms(struct device *dev, struct device_attribute *attr,
589  char *buf)
590 {
591  struct lm87_data *data = lm87_update_device(dev);
592  return sprintf(buf, "%d\n", data->alarms);
593 }
594 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
595 
596 static ssize_t show_vid(struct device *dev, struct device_attribute *attr,
597  char *buf)
598 {
599  struct lm87_data *data = lm87_update_device(dev);
600  return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
601 }
602 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
603 
604 static ssize_t show_vrm(struct device *dev, struct device_attribute *attr,
605  char *buf)
606 {
607  struct lm87_data *data = dev_get_drvdata(dev);
608  return sprintf(buf, "%d\n", data->vrm);
609 }
610 static ssize_t set_vrm(struct device *dev, struct device_attribute *attr,
611  const char *buf, size_t count)
612 {
613  struct lm87_data *data = dev_get_drvdata(dev);
614  unsigned long val;
615  int err;
616 
617  err = kstrtoul(buf, 10, &val);
618  if (err)
619  return err;
620  data->vrm = val;
621  return count;
622 }
623 static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm, set_vrm);
624 
625 static ssize_t show_aout(struct device *dev, struct device_attribute *attr,
626  char *buf)
627 {
628  struct lm87_data *data = lm87_update_device(dev);
629  return sprintf(buf, "%d\n", AOUT_FROM_REG(data->aout));
630 }
631 static ssize_t set_aout(struct device *dev, struct device_attribute *attr,
632  const char *buf, size_t count)
633 {
634  struct i2c_client *client = to_i2c_client(dev);
635  struct lm87_data *data = i2c_get_clientdata(client);
636  long val;
637  int err;
638 
639  err = kstrtol(buf, 10, &val);
640  if (err)
641  return err;
642 
643  mutex_lock(&data->update_lock);
644  data->aout = AOUT_TO_REG(val);
645  lm87_write_value(client, LM87_REG_AOUT, data->aout);
646  mutex_unlock(&data->update_lock);
647  return count;
648 }
649 static DEVICE_ATTR(aout_output, S_IRUGO | S_IWUSR, show_aout, set_aout);
650 
651 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
652  char *buf)
653 {
654  struct lm87_data *data = lm87_update_device(dev);
655  int bitnr = to_sensor_dev_attr(attr)->index;
656  return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
657 }
658 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
659 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
660 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
661 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
662 static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8);
663 static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 9);
664 static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 6);
665 static SENSOR_DEVICE_ATTR(in7_alarm, S_IRUGO, show_alarm, NULL, 7);
666 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4);
667 static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 5);
668 static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 5);
669 static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 6);
670 static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 7);
671 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 14);
672 static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 15);
673 
674 /*
675  * Real code
676  */
677 
678 static struct attribute *lm87_attributes[] = {
679  &sensor_dev_attr_in1_input.dev_attr.attr,
680  &sensor_dev_attr_in1_min.dev_attr.attr,
681  &sensor_dev_attr_in1_max.dev_attr.attr,
682  &sensor_dev_attr_in1_alarm.dev_attr.attr,
683  &sensor_dev_attr_in2_input.dev_attr.attr,
684  &sensor_dev_attr_in2_min.dev_attr.attr,
685  &sensor_dev_attr_in2_max.dev_attr.attr,
686  &sensor_dev_attr_in2_alarm.dev_attr.attr,
687  &sensor_dev_attr_in3_input.dev_attr.attr,
688  &sensor_dev_attr_in3_min.dev_attr.attr,
689  &sensor_dev_attr_in3_max.dev_attr.attr,
690  &sensor_dev_attr_in3_alarm.dev_attr.attr,
691  &sensor_dev_attr_in4_input.dev_attr.attr,
692  &sensor_dev_attr_in4_min.dev_attr.attr,
693  &sensor_dev_attr_in4_max.dev_attr.attr,
694  &sensor_dev_attr_in4_alarm.dev_attr.attr,
695 
696  &sensor_dev_attr_temp1_input.dev_attr.attr,
697  &sensor_dev_attr_temp1_max.dev_attr.attr,
698  &sensor_dev_attr_temp1_min.dev_attr.attr,
699  &dev_attr_temp1_crit.attr,
700  &sensor_dev_attr_temp1_alarm.dev_attr.attr,
701  &sensor_dev_attr_temp2_input.dev_attr.attr,
702  &sensor_dev_attr_temp2_max.dev_attr.attr,
703  &sensor_dev_attr_temp2_min.dev_attr.attr,
704  &dev_attr_temp2_crit.attr,
705  &sensor_dev_attr_temp2_alarm.dev_attr.attr,
706  &sensor_dev_attr_temp2_fault.dev_attr.attr,
707 
708  &dev_attr_alarms.attr,
709  &dev_attr_aout_output.attr,
710 
711  NULL
712 };
713 
714 static const struct attribute_group lm87_group = {
715  .attrs = lm87_attributes,
716 };
717 
718 static struct attribute *lm87_attributes_in6[] = {
719  &sensor_dev_attr_in6_input.dev_attr.attr,
720  &sensor_dev_attr_in6_min.dev_attr.attr,
721  &sensor_dev_attr_in6_max.dev_attr.attr,
722  &sensor_dev_attr_in6_alarm.dev_attr.attr,
723  NULL
724 };
725 
726 static const struct attribute_group lm87_group_in6 = {
727  .attrs = lm87_attributes_in6,
728 };
729 
730 static struct attribute *lm87_attributes_fan1[] = {
731  &sensor_dev_attr_fan1_input.dev_attr.attr,
732  &sensor_dev_attr_fan1_min.dev_attr.attr,
733  &sensor_dev_attr_fan1_div.dev_attr.attr,
734  &sensor_dev_attr_fan1_alarm.dev_attr.attr,
735  NULL
736 };
737 
738 static const struct attribute_group lm87_group_fan1 = {
739  .attrs = lm87_attributes_fan1,
740 };
741 
742 static struct attribute *lm87_attributes_in7[] = {
743  &sensor_dev_attr_in7_input.dev_attr.attr,
744  &sensor_dev_attr_in7_min.dev_attr.attr,
745  &sensor_dev_attr_in7_max.dev_attr.attr,
746  &sensor_dev_attr_in7_alarm.dev_attr.attr,
747  NULL
748 };
749 
750 static const struct attribute_group lm87_group_in7 = {
751  .attrs = lm87_attributes_in7,
752 };
753 
754 static struct attribute *lm87_attributes_fan2[] = {
755  &sensor_dev_attr_fan2_input.dev_attr.attr,
756  &sensor_dev_attr_fan2_min.dev_attr.attr,
757  &sensor_dev_attr_fan2_div.dev_attr.attr,
758  &sensor_dev_attr_fan2_alarm.dev_attr.attr,
759  NULL
760 };
761 
762 static const struct attribute_group lm87_group_fan2 = {
763  .attrs = lm87_attributes_fan2,
764 };
765 
766 static struct attribute *lm87_attributes_temp3[] = {
767  &sensor_dev_attr_temp3_input.dev_attr.attr,
768  &sensor_dev_attr_temp3_max.dev_attr.attr,
769  &sensor_dev_attr_temp3_min.dev_attr.attr,
770  &dev_attr_temp3_crit.attr,
771  &sensor_dev_attr_temp3_alarm.dev_attr.attr,
772  &sensor_dev_attr_temp3_fault.dev_attr.attr,
773  NULL
774 };
775 
776 static const struct attribute_group lm87_group_temp3 = {
777  .attrs = lm87_attributes_temp3,
778 };
779 
780 static struct attribute *lm87_attributes_in0_5[] = {
781  &sensor_dev_attr_in0_input.dev_attr.attr,
782  &sensor_dev_attr_in0_min.dev_attr.attr,
783  &sensor_dev_attr_in0_max.dev_attr.attr,
784  &sensor_dev_attr_in0_alarm.dev_attr.attr,
785  &sensor_dev_attr_in5_input.dev_attr.attr,
786  &sensor_dev_attr_in5_min.dev_attr.attr,
787  &sensor_dev_attr_in5_max.dev_attr.attr,
788  &sensor_dev_attr_in5_alarm.dev_attr.attr,
789  NULL
790 };
791 
792 static const struct attribute_group lm87_group_in0_5 = {
793  .attrs = lm87_attributes_in0_5,
794 };
795 
796 static struct attribute *lm87_attributes_vid[] = {
797  &dev_attr_cpu0_vid.attr,
798  &dev_attr_vrm.attr,
799  NULL
800 };
801 
802 static const struct attribute_group lm87_group_vid = {
803  .attrs = lm87_attributes_vid,
804 };
805 
806 /* Return 0 if detection is successful, -ENODEV otherwise */
807 static int lm87_detect(struct i2c_client *client, struct i2c_board_info *info)
808 {
809  struct i2c_adapter *adapter = client->adapter;
810  const char *name;
811  u8 cid, rev;
812 
813  if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
814  return -ENODEV;
815 
816  if (lm87_read_value(client, LM87_REG_CONFIG) & 0x80)
817  return -ENODEV;
818 
819  /* Now, we do the remaining detection. */
820  cid = lm87_read_value(client, LM87_REG_COMPANY_ID);
821  rev = lm87_read_value(client, LM87_REG_REVISION);
822 
823  if (cid == 0x02 /* National Semiconductor */
824  && (rev >= 0x01 && rev <= 0x08))
825  name = "lm87";
826  else if (cid == 0x41 /* Analog Devices */
827  && (rev & 0xf0) == 0x10)
828  name = "adm1024";
829  else {
830  dev_dbg(&adapter->dev, "LM87 detection failed at 0x%02x\n",
831  client->addr);
832  return -ENODEV;
833  }
834 
835  strlcpy(info->type, name, I2C_NAME_SIZE);
836 
837  return 0;
838 }
839 
840 static void lm87_remove_files(struct i2c_client *client)
841 {
842  struct device *dev = &client->dev;
843 
844  sysfs_remove_group(&dev->kobj, &lm87_group);
845  sysfs_remove_group(&dev->kobj, &lm87_group_in6);
846  sysfs_remove_group(&dev->kobj, &lm87_group_fan1);
847  sysfs_remove_group(&dev->kobj, &lm87_group_in7);
848  sysfs_remove_group(&dev->kobj, &lm87_group_fan2);
849  sysfs_remove_group(&dev->kobj, &lm87_group_temp3);
850  sysfs_remove_group(&dev->kobj, &lm87_group_in0_5);
851  sysfs_remove_group(&dev->kobj, &lm87_group_vid);
852 }
853 
854 static void lm87_init_client(struct i2c_client *client)
855 {
856  struct lm87_data *data = i2c_get_clientdata(client);
857 
858  if (client->dev.platform_data) {
859  data->channel = *(u8 *)client->dev.platform_data;
860  lm87_write_value(client,
862  } else {
863  data->channel = lm87_read_value(client, LM87_REG_CHANNEL_MODE);
864  }
865  data->config = lm87_read_value(client, LM87_REG_CONFIG) & 0x6F;
866 
867  if (!(data->config & 0x01)) {
868  int i;
869 
870  /* Limits are left uninitialized after power-up */
871  for (i = 1; i < 6; i++) {
872  lm87_write_value(client, LM87_REG_IN_MIN(i), 0x00);
873  lm87_write_value(client, LM87_REG_IN_MAX(i), 0xFF);
874  }
875  for (i = 0; i < 2; i++) {
876  lm87_write_value(client, LM87_REG_TEMP_HIGH[i], 0x7F);
877  lm87_write_value(client, LM87_REG_TEMP_LOW[i], 0x00);
878  lm87_write_value(client, LM87_REG_AIN_MIN(i), 0x00);
879  lm87_write_value(client, LM87_REG_AIN_MAX(i), 0xFF);
880  }
881  if (data->channel & CHAN_TEMP3) {
882  lm87_write_value(client, LM87_REG_TEMP_HIGH[2], 0x7F);
883  lm87_write_value(client, LM87_REG_TEMP_LOW[2], 0x00);
884  } else {
885  lm87_write_value(client, LM87_REG_IN_MIN(0), 0x00);
886  lm87_write_value(client, LM87_REG_IN_MAX(0), 0xFF);
887  }
888  }
889 
890  /* Make sure Start is set and INT#_Clear is clear */
891  if ((data->config & 0x09) != 0x01)
892  lm87_write_value(client, LM87_REG_CONFIG,
893  (data->config & 0x77) | 0x01);
894 }
895 
896 static int lm87_probe(struct i2c_client *client, const struct i2c_device_id *id)
897 {
898  struct lm87_data *data;
899  int err;
900 
901  data = devm_kzalloc(&client->dev, sizeof(struct lm87_data), GFP_KERNEL);
902  if (!data)
903  return -ENOMEM;
904 
905  i2c_set_clientdata(client, data);
906  data->valid = 0;
907  mutex_init(&data->update_lock);
908 
909  /* Initialize the LM87 chip */
910  lm87_init_client(client);
911 
912  data->in_scale[0] = 2500;
913  data->in_scale[1] = 2700;
914  data->in_scale[2] = (data->channel & CHAN_VCC_5V) ? 5000 : 3300;
915  data->in_scale[3] = 5000;
916  data->in_scale[4] = 12000;
917  data->in_scale[5] = 2700;
918  data->in_scale[6] = 1875;
919  data->in_scale[7] = 1875;
920 
921  /* Register sysfs hooks */
922  err = sysfs_create_group(&client->dev.kobj, &lm87_group);
923  if (err)
924  goto exit_stop;
925 
926  if (data->channel & CHAN_NO_FAN(0)) {
927  err = sysfs_create_group(&client->dev.kobj, &lm87_group_in6);
928  if (err)
929  goto exit_remove;
930  } else {
931  err = sysfs_create_group(&client->dev.kobj, &lm87_group_fan1);
932  if (err)
933  goto exit_remove;
934  }
935 
936  if (data->channel & CHAN_NO_FAN(1)) {
937  err = sysfs_create_group(&client->dev.kobj, &lm87_group_in7);
938  if (err)
939  goto exit_remove;
940  } else {
941  err = sysfs_create_group(&client->dev.kobj, &lm87_group_fan2);
942  if (err)
943  goto exit_remove;
944  }
945 
946  if (data->channel & CHAN_TEMP3) {
947  err = sysfs_create_group(&client->dev.kobj, &lm87_group_temp3);
948  if (err)
949  goto exit_remove;
950  } else {
951  err = sysfs_create_group(&client->dev.kobj, &lm87_group_in0_5);
952  if (err)
953  goto exit_remove;
954  }
955 
956  if (!(data->channel & CHAN_NO_VID)) {
957  data->vrm = vid_which_vrm();
958  err = sysfs_create_group(&client->dev.kobj, &lm87_group_vid);
959  if (err)
960  goto exit_remove;
961  }
962 
963  data->hwmon_dev = hwmon_device_register(&client->dev);
964  if (IS_ERR(data->hwmon_dev)) {
965  err = PTR_ERR(data->hwmon_dev);
966  goto exit_remove;
967  }
968 
969  return 0;
970 
971 exit_remove:
972  lm87_remove_files(client);
973 exit_stop:
974  lm87_write_value(client, LM87_REG_CONFIG, data->config);
975  return err;
976 }
977 
978 static int lm87_remove(struct i2c_client *client)
979 {
980  struct lm87_data *data = i2c_get_clientdata(client);
981 
983  lm87_remove_files(client);
984 
985  lm87_write_value(client, LM87_REG_CONFIG, data->config);
986  return 0;
987 }
988 
989 /*
990  * Driver data (common to all clients)
991  */
992 
993 static const struct i2c_device_id lm87_id[] = {
994  { "lm87", lm87 },
995  { "adm1024", adm1024 },
996  { }
997 };
998 MODULE_DEVICE_TABLE(i2c, lm87_id);
999 
1000 static struct i2c_driver lm87_driver = {
1001  .class = I2C_CLASS_HWMON,
1002  .driver = {
1003  .name = "lm87",
1004  },
1005  .probe = lm87_probe,
1006  .remove = lm87_remove,
1007  .id_table = lm87_id,
1008  .detect = lm87_detect,
1009  .address_list = normal_i2c,
1010 };
1011 
1012 module_i2c_driver(lm87_driver);
1013 
1014 MODULE_AUTHOR("Jean Delvare <[email protected]> and others");
1015 MODULE_DESCRIPTION("LM87 driver");
1016 MODULE_LICENSE("GPL");