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adm9240.c
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1 /*
2  * adm9240.c Part of lm_sensors, Linux kernel modules for hardware
3  * monitoring
4  *
5  * Copyright (C) 1999 Frodo Looijaard <[email protected]>
6  * Philip Edelbrock <[email protected]>
7  * Copyright (C) 2003 Michiel Rook <[email protected]>
8  * Copyright (C) 2005 Grant Coady <[email protected]> with valuable
9  * guidance from Jean Delvare
10  *
11  * Driver supports Analog Devices ADM9240
12  * Dallas Semiconductor DS1780
13  * National Semiconductor LM81
14  *
15  * ADM9240 is the reference, DS1780 and LM81 are register compatibles
16  *
17  * Voltage Six inputs are scaled by chip, VID also reported
18  * Temperature Chip temperature to 0.5'C, maximum and max_hysteris
19  * Fans 2 fans, low speed alarm, automatic fan clock divider
20  * Alarms 16-bit map of active alarms
21  * Analog Out 0..1250 mV output
22  *
23  * Chassis Intrusion: clear CI latch with 'echo 0 > intrusion0_alarm'
24  *
25  * Test hardware: Intel SE440BX-2 desktop motherboard --Grant
26  *
27  * LM81 extended temp reading not implemented
28  *
29  * This program is free software; you can redistribute it and/or modify
30  * it under the terms of the GNU General Public License as published by
31  * the Free Software Foundation; either version 2 of the License, or
32  * (at your option) any later version.
33  *
34  * This program is distributed in the hope that it will be useful,
35  * but WITHOUT ANY WARRANTY; without even the implied warranty of
36  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
37  * GNU General Public License for more details.
38  *
39  * You should have received a copy of the GNU General Public License
40  * along with this program; if not, write to the Free Software
41  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
42  */
43 
44 #include <linux/init.h>
45 #include <linux/module.h>
46 #include <linux/slab.h>
47 #include <linux/i2c.h>
48 #include <linux/hwmon-sysfs.h>
49 #include <linux/hwmon.h>
50 #include <linux/hwmon-vid.h>
51 #include <linux/err.h>
52 #include <linux/mutex.h>
53 #include <linux/jiffies.h>
54 
55 /* Addresses to scan */
56 static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, 0x2f,
57  I2C_CLIENT_END };
58 
59 enum chips { adm9240, ds1780, lm81 };
60 
61 /* ADM9240 registers */
62 #define ADM9240_REG_MAN_ID 0x3e
63 #define ADM9240_REG_DIE_REV 0x3f
64 #define ADM9240_REG_CONFIG 0x40
65 
66 #define ADM9240_REG_IN(nr) (0x20 + (nr)) /* 0..5 */
67 #define ADM9240_REG_IN_MAX(nr) (0x2b + (nr) * 2)
68 #define ADM9240_REG_IN_MIN(nr) (0x2c + (nr) * 2)
69 #define ADM9240_REG_FAN(nr) (0x28 + (nr)) /* 0..1 */
70 #define ADM9240_REG_FAN_MIN(nr) (0x3b + (nr))
71 #define ADM9240_REG_INT(nr) (0x41 + (nr))
72 #define ADM9240_REG_INT_MASK(nr) (0x43 + (nr))
73 #define ADM9240_REG_TEMP 0x27
74 #define ADM9240_REG_TEMP_MAX(nr) (0x39 + (nr)) /* 0, 1 = high, hyst */
75 #define ADM9240_REG_ANALOG_OUT 0x19
76 #define ADM9240_REG_CHASSIS_CLEAR 0x46
77 #define ADM9240_REG_VID_FAN_DIV 0x47
78 #define ADM9240_REG_I2C_ADDR 0x48
79 #define ADM9240_REG_VID4 0x49
80 #define ADM9240_REG_TEMP_CONF 0x4b
81 
82 /* generalised scaling with integer rounding */
83 static inline int SCALE(long val, int mul, int div)
84 {
85  if (val < 0)
86  return (val * mul - div / 2) / div;
87  else
88  return (val * mul + div / 2) / div;
89 }
90 
91 /* adm9240 internally scales voltage measurements */
92 static const u16 nom_mv[] = { 2500, 2700, 3300, 5000, 12000, 2700 };
93 
94 static inline unsigned int IN_FROM_REG(u8 reg, int n)
95 {
96  return SCALE(reg, nom_mv[n], 192);
97 }
98 
99 static inline u8 IN_TO_REG(unsigned long val, int n)
100 {
101  return SENSORS_LIMIT(SCALE(val, 192, nom_mv[n]), 0, 255);
102 }
103 
104 /* temperature range: -40..125, 127 disables temperature alarm */
105 static inline s8 TEMP_TO_REG(long val)
106 {
107  return SENSORS_LIMIT(SCALE(val, 1, 1000), -40, 127);
108 }
109 
110 /* two fans, each with low fan speed limit */
111 static inline unsigned int FAN_FROM_REG(u8 reg, u8 div)
112 {
113  if (!reg) /* error */
114  return -1;
115 
116  if (reg == 255)
117  return 0;
118 
119  return SCALE(1350000, 1, reg * div);
120 }
121 
122 /* analog out 0..1250mV */
123 static inline u8 AOUT_TO_REG(unsigned long val)
124 {
125  return SENSORS_LIMIT(SCALE(val, 255, 1250), 0, 255);
126 }
127 
128 static inline unsigned int AOUT_FROM_REG(u8 reg)
129 {
130  return SCALE(reg, 1250, 255);
131 }
132 
133 static int adm9240_probe(struct i2c_client *client,
134  const struct i2c_device_id *id);
135 static int adm9240_detect(struct i2c_client *client,
136  struct i2c_board_info *info);
137 static void adm9240_init_client(struct i2c_client *client);
138 static int adm9240_remove(struct i2c_client *client);
139 static struct adm9240_data *adm9240_update_device(struct device *dev);
140 
141 /* driver data */
142 static const struct i2c_device_id adm9240_id[] = {
143  { "adm9240", adm9240 },
144  { "ds1780", ds1780 },
145  { "lm81", lm81 },
146  { }
147 };
148 MODULE_DEVICE_TABLE(i2c, adm9240_id);
149 
150 static struct i2c_driver adm9240_driver = {
151  .class = I2C_CLASS_HWMON,
152  .driver = {
153  .name = "adm9240",
154  },
155  .probe = adm9240_probe,
156  .remove = adm9240_remove,
157  .id_table = adm9240_id,
158  .detect = adm9240_detect,
159  .address_list = normal_i2c,
160 };
161 
162 /* per client data */
163 struct adm9240_data {
164  struct device *hwmon_dev;
165  struct mutex update_lock;
166  char valid;
167  unsigned long last_updated_measure;
168  unsigned long last_updated_config;
169 
170  u8 in[6]; /* ro in0_input */
171  u8 in_max[6]; /* rw in0_max */
172  u8 in_min[6]; /* rw in0_min */
173  u8 fan[2]; /* ro fan1_input */
174  u8 fan_min[2]; /* rw fan1_min */
175  u8 fan_div[2]; /* rw fan1_div, read-only accessor */
176  s16 temp; /* ro temp1_input, 9-bit sign-extended */
177  s8 temp_max[2]; /* rw 0 -> temp_max, 1 -> temp_max_hyst */
178  u16 alarms; /* ro alarms */
179  u8 aout; /* rw aout_output */
180  u8 vid; /* ro vid */
181  u8 vrm; /* -- vrm set on startup, no accessor */
182 };
183 
184 /*** sysfs accessors ***/
185 
186 /* temperature */
187 static ssize_t show_temp(struct device *dev, struct device_attribute *dummy,
188  char *buf)
189 {
190  struct adm9240_data *data = adm9240_update_device(dev);
191  return sprintf(buf, "%d\n", data->temp * 500); /* 9-bit value */
192 }
193 
194 static ssize_t show_max(struct device *dev, struct device_attribute *devattr,
195  char *buf)
196 {
197  struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
198  struct adm9240_data *data = adm9240_update_device(dev);
199  return sprintf(buf, "%d\n", data->temp_max[attr->index] * 1000);
200 }
201 
202 static ssize_t set_max(struct device *dev, struct device_attribute *devattr,
203  const char *buf, size_t count)
204 {
205  struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
206  struct i2c_client *client = to_i2c_client(dev);
207  struct adm9240_data *data = i2c_get_clientdata(client);
208  long val;
209  int err;
210 
211  err = kstrtol(buf, 10, &val);
212  if (err)
213  return err;
214 
215  mutex_lock(&data->update_lock);
216  data->temp_max[attr->index] = TEMP_TO_REG(val);
217  i2c_smbus_write_byte_data(client, ADM9240_REG_TEMP_MAX(attr->index),
218  data->temp_max[attr->index]);
219  mutex_unlock(&data->update_lock);
220  return count;
221 }
222 
223 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL);
224 static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO,
225  show_max, set_max, 0);
226 static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO,
227  show_max, set_max, 1);
228 
229 /* voltage */
230 static ssize_t show_in(struct device *dev, struct device_attribute *devattr,
231  char *buf)
232 {
233  struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
234  struct adm9240_data *data = adm9240_update_device(dev);
235  return sprintf(buf, "%d\n", IN_FROM_REG(data->in[attr->index],
236  attr->index));
237 }
238 
239 static ssize_t show_in_min(struct device *dev,
240  struct device_attribute *devattr, char *buf)
241 {
242  struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
243  struct adm9240_data *data = adm9240_update_device(dev);
244  return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[attr->index],
245  attr->index));
246 }
247 
248 static ssize_t show_in_max(struct device *dev,
249  struct device_attribute *devattr, char *buf)
250 {
251  struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
252  struct adm9240_data *data = adm9240_update_device(dev);
253  return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[attr->index],
254  attr->index));
255 }
256 
257 static ssize_t set_in_min(struct device *dev,
258  struct device_attribute *devattr,
259  const char *buf, size_t count)
260 {
261  struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
262  struct i2c_client *client = to_i2c_client(dev);
263  struct adm9240_data *data = i2c_get_clientdata(client);
264  unsigned long val;
265  int err;
266 
267  err = kstrtoul(buf, 10, &val);
268  if (err)
269  return err;
270 
271  mutex_lock(&data->update_lock);
272  data->in_min[attr->index] = IN_TO_REG(val, attr->index);
273  i2c_smbus_write_byte_data(client, ADM9240_REG_IN_MIN(attr->index),
274  data->in_min[attr->index]);
275  mutex_unlock(&data->update_lock);
276  return count;
277 }
278 
279 static ssize_t set_in_max(struct device *dev,
280  struct device_attribute *devattr,
281  const char *buf, size_t count)
282 {
283  struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
284  struct i2c_client *client = to_i2c_client(dev);
285  struct adm9240_data *data = i2c_get_clientdata(client);
286  unsigned long val;
287  int err;
288 
289  err = kstrtoul(buf, 10, &val);
290  if (err)
291  return err;
292 
293  mutex_lock(&data->update_lock);
294  data->in_max[attr->index] = IN_TO_REG(val, attr->index);
295  i2c_smbus_write_byte_data(client, ADM9240_REG_IN_MAX(attr->index),
296  data->in_max[attr->index]);
297  mutex_unlock(&data->update_lock);
298  return count;
299 }
300 
301 #define vin(nr) \
302 static SENSOR_DEVICE_ATTR(in##nr##_input, S_IRUGO, \
303  show_in, NULL, nr); \
304 static SENSOR_DEVICE_ATTR(in##nr##_min, S_IRUGO | S_IWUSR, \
305  show_in_min, set_in_min, nr); \
306 static SENSOR_DEVICE_ATTR(in##nr##_max, S_IRUGO | S_IWUSR, \
307  show_in_max, set_in_max, nr);
308 
309 vin(0);
310 vin(1);
311 vin(2);
312 vin(3);
313 vin(4);
314 vin(5);
315 
316 /* fans */
317 static ssize_t show_fan(struct device *dev,
318  struct device_attribute *devattr, char *buf)
319 {
320  struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
321  struct adm9240_data *data = adm9240_update_device(dev);
322  return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[attr->index],
323  1 << data->fan_div[attr->index]));
324 }
325 
326 static ssize_t show_fan_min(struct device *dev,
327  struct device_attribute *devattr, char *buf)
328 {
329  struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
330  struct adm9240_data *data = adm9240_update_device(dev);
331  return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[attr->index],
332  1 << data->fan_div[attr->index]));
333 }
334 
335 static ssize_t show_fan_div(struct device *dev,
336  struct device_attribute *devattr, char *buf)
337 {
338  struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
339  struct adm9240_data *data = adm9240_update_device(dev);
340  return sprintf(buf, "%d\n", 1 << data->fan_div[attr->index]);
341 }
342 
343 /* write new fan div, callers must hold data->update_lock */
344 static void adm9240_write_fan_div(struct i2c_client *client, int nr,
345  u8 fan_div)
346 {
347  u8 reg, old, shift = (nr + 2) * 2;
348 
349  reg = i2c_smbus_read_byte_data(client, ADM9240_REG_VID_FAN_DIV);
350  old = (reg >> shift) & 3;
351  reg &= ~(3 << shift);
352  reg |= (fan_div << shift);
353  i2c_smbus_write_byte_data(client, ADM9240_REG_VID_FAN_DIV, reg);
354  dev_dbg(&client->dev, "fan%d clock divider changed from %u "
355  "to %u\n", nr + 1, 1 << old, 1 << fan_div);
356 }
357 
358 /*
359  * set fan speed low limit:
360  *
361  * - value is zero: disable fan speed low limit alarm
362  *
363  * - value is below fan speed measurement range: enable fan speed low
364  * limit alarm to be asserted while fan speed too slow to measure
365  *
366  * - otherwise: select fan clock divider to suit fan speed low limit,
367  * measurement code may adjust registers to ensure fan speed reading
368  */
369 static ssize_t set_fan_min(struct device *dev,
370  struct device_attribute *devattr,
371  const char *buf, size_t count)
372 {
373  struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
374  struct i2c_client *client = to_i2c_client(dev);
375  struct adm9240_data *data = i2c_get_clientdata(client);
376  int nr = attr->index;
377  u8 new_div;
378  unsigned long val;
379  int err;
380 
381  err = kstrtoul(buf, 10, &val);
382  if (err)
383  return err;
384 
385  mutex_lock(&data->update_lock);
386 
387  if (!val) {
388  data->fan_min[nr] = 255;
389  new_div = data->fan_div[nr];
390 
391  dev_dbg(&client->dev, "fan%u low limit set disabled\n",
392  nr + 1);
393 
394  } else if (val < 1350000 / (8 * 254)) {
395  new_div = 3;
396  data->fan_min[nr] = 254;
397 
398  dev_dbg(&client->dev, "fan%u low limit set minimum %u\n",
399  nr + 1, FAN_FROM_REG(254, 1 << new_div));
400 
401  } else {
402  unsigned int new_min = 1350000 / val;
403 
404  new_div = 0;
405  while (new_min > 192 && new_div < 3) {
406  new_div++;
407  new_min /= 2;
408  }
409  if (!new_min) /* keep > 0 */
410  new_min++;
411 
412  data->fan_min[nr] = new_min;
413 
414  dev_dbg(&client->dev, "fan%u low limit set fan speed %u\n",
415  nr + 1, FAN_FROM_REG(new_min, 1 << new_div));
416  }
417 
418  if (new_div != data->fan_div[nr]) {
419  data->fan_div[nr] = new_div;
420  adm9240_write_fan_div(client, nr, new_div);
421  }
422  i2c_smbus_write_byte_data(client, ADM9240_REG_FAN_MIN(nr),
423  data->fan_min[nr]);
424 
425  mutex_unlock(&data->update_lock);
426  return count;
427 }
428 
429 #define fan(nr) \
430 static SENSOR_DEVICE_ATTR(fan##nr##_input, S_IRUGO, \
431  show_fan, NULL, nr - 1); \
432 static SENSOR_DEVICE_ATTR(fan##nr##_div, S_IRUGO, \
433  show_fan_div, NULL, nr - 1); \
434 static SENSOR_DEVICE_ATTR(fan##nr##_min, S_IRUGO | S_IWUSR, \
435  show_fan_min, set_fan_min, nr - 1);
436 
437 fan(1);
438 fan(2);
439 
440 /* alarms */
441 static ssize_t show_alarms(struct device *dev,
442  struct device_attribute *attr, char *buf)
443 {
444  struct adm9240_data *data = adm9240_update_device(dev);
445  return sprintf(buf, "%u\n", data->alarms);
446 }
447 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
448 
449 static ssize_t show_alarm(struct device *dev,
450  struct device_attribute *attr, char *buf)
451 {
452  int bitnr = to_sensor_dev_attr(attr)->index;
453  struct adm9240_data *data = adm9240_update_device(dev);
454  return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
455 }
456 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
457 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
458 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
459 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
460 static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8);
461 static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 9);
462 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4);
463 static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 6);
464 static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 7);
465 
466 /* vid */
467 static ssize_t show_vid(struct device *dev,
468  struct device_attribute *attr, char *buf)
469 {
470  struct adm9240_data *data = adm9240_update_device(dev);
471  return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
472 }
473 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
474 
475 /* analog output */
476 static ssize_t show_aout(struct device *dev,
477  struct device_attribute *attr, char *buf)
478 {
479  struct adm9240_data *data = adm9240_update_device(dev);
480  return sprintf(buf, "%d\n", AOUT_FROM_REG(data->aout));
481 }
482 
483 static ssize_t set_aout(struct device *dev,
484  struct device_attribute *attr,
485  const char *buf, size_t count)
486 {
487  struct i2c_client *client = to_i2c_client(dev);
488  struct adm9240_data *data = i2c_get_clientdata(client);
489  long val;
490  int err;
491 
492  err = kstrtol(buf, 10, &val);
493  if (err)
494  return err;
495 
496  mutex_lock(&data->update_lock);
497  data->aout = AOUT_TO_REG(val);
498  i2c_smbus_write_byte_data(client, ADM9240_REG_ANALOG_OUT, data->aout);
499  mutex_unlock(&data->update_lock);
500  return count;
501 }
502 static DEVICE_ATTR(aout_output, S_IRUGO | S_IWUSR, show_aout, set_aout);
503 
504 static ssize_t chassis_clear(struct device *dev,
505  struct device_attribute *attr,
506  const char *buf, size_t count)
507 {
508  struct i2c_client *client = to_i2c_client(dev);
509  struct adm9240_data *data = i2c_get_clientdata(client);
510  unsigned long val;
511 
512  if (kstrtoul(buf, 10, &val) || val != 0)
513  return -EINVAL;
514 
515  mutex_lock(&data->update_lock);
516  i2c_smbus_write_byte_data(client, ADM9240_REG_CHASSIS_CLEAR, 0x80);
517  data->valid = 0; /* Force cache refresh */
518  mutex_unlock(&data->update_lock);
519  dev_dbg(&client->dev, "chassis intrusion latch cleared\n");
520 
521  return count;
522 }
523 static SENSOR_DEVICE_ATTR(intrusion0_alarm, S_IRUGO | S_IWUSR, show_alarm,
524  chassis_clear, 12);
525 
526 static struct attribute *adm9240_attributes[] = {
527  &sensor_dev_attr_in0_input.dev_attr.attr,
528  &sensor_dev_attr_in0_min.dev_attr.attr,
529  &sensor_dev_attr_in0_max.dev_attr.attr,
530  &sensor_dev_attr_in0_alarm.dev_attr.attr,
531  &sensor_dev_attr_in1_input.dev_attr.attr,
532  &sensor_dev_attr_in1_min.dev_attr.attr,
533  &sensor_dev_attr_in1_max.dev_attr.attr,
534  &sensor_dev_attr_in1_alarm.dev_attr.attr,
535  &sensor_dev_attr_in2_input.dev_attr.attr,
536  &sensor_dev_attr_in2_min.dev_attr.attr,
537  &sensor_dev_attr_in2_max.dev_attr.attr,
538  &sensor_dev_attr_in2_alarm.dev_attr.attr,
539  &sensor_dev_attr_in3_input.dev_attr.attr,
540  &sensor_dev_attr_in3_min.dev_attr.attr,
541  &sensor_dev_attr_in3_max.dev_attr.attr,
542  &sensor_dev_attr_in3_alarm.dev_attr.attr,
543  &sensor_dev_attr_in4_input.dev_attr.attr,
544  &sensor_dev_attr_in4_min.dev_attr.attr,
545  &sensor_dev_attr_in4_max.dev_attr.attr,
546  &sensor_dev_attr_in4_alarm.dev_attr.attr,
547  &sensor_dev_attr_in5_input.dev_attr.attr,
548  &sensor_dev_attr_in5_min.dev_attr.attr,
549  &sensor_dev_attr_in5_max.dev_attr.attr,
550  &sensor_dev_attr_in5_alarm.dev_attr.attr,
551  &dev_attr_temp1_input.attr,
552  &sensor_dev_attr_temp1_max.dev_attr.attr,
553  &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
554  &sensor_dev_attr_temp1_alarm.dev_attr.attr,
555  &sensor_dev_attr_fan1_input.dev_attr.attr,
556  &sensor_dev_attr_fan1_div.dev_attr.attr,
557  &sensor_dev_attr_fan1_min.dev_attr.attr,
558  &sensor_dev_attr_fan1_alarm.dev_attr.attr,
559  &sensor_dev_attr_fan2_input.dev_attr.attr,
560  &sensor_dev_attr_fan2_div.dev_attr.attr,
561  &sensor_dev_attr_fan2_min.dev_attr.attr,
562  &sensor_dev_attr_fan2_alarm.dev_attr.attr,
563  &dev_attr_alarms.attr,
564  &dev_attr_aout_output.attr,
565  &sensor_dev_attr_intrusion0_alarm.dev_attr.attr,
566  &dev_attr_cpu0_vid.attr,
567  NULL
568 };
569 
570 static const struct attribute_group adm9240_group = {
571  .attrs = adm9240_attributes,
572 };
573 
574 
575 /*** sensor chip detect and driver install ***/
576 
577 /* Return 0 if detection is successful, -ENODEV otherwise */
578 static int adm9240_detect(struct i2c_client *new_client,
579  struct i2c_board_info *info)
580 {
581  struct i2c_adapter *adapter = new_client->adapter;
582  const char *name = "";
583  int address = new_client->addr;
584  u8 man_id, die_rev;
585 
586  if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
587  return -ENODEV;
588 
589  /* verify chip: reg address should match i2c address */
590  if (i2c_smbus_read_byte_data(new_client, ADM9240_REG_I2C_ADDR)
591  != address) {
592  dev_err(&adapter->dev, "detect fail: address match, 0x%02x\n",
593  address);
594  return -ENODEV;
595  }
596 
597  /* check known chip manufacturer */
598  man_id = i2c_smbus_read_byte_data(new_client, ADM9240_REG_MAN_ID);
599  if (man_id == 0x23) {
600  name = "adm9240";
601  } else if (man_id == 0xda) {
602  name = "ds1780";
603  } else if (man_id == 0x01) {
604  name = "lm81";
605  } else {
606  dev_err(&adapter->dev, "detect fail: unknown manuf, 0x%02x\n",
607  man_id);
608  return -ENODEV;
609  }
610 
611  /* successful detect, print chip info */
612  die_rev = i2c_smbus_read_byte_data(new_client, ADM9240_REG_DIE_REV);
613  dev_info(&adapter->dev, "found %s revision %u\n",
614  man_id == 0x23 ? "ADM9240" :
615  man_id == 0xda ? "DS1780" : "LM81", die_rev);
616 
617  strlcpy(info->type, name, I2C_NAME_SIZE);
618 
619  return 0;
620 }
621 
622 static int adm9240_probe(struct i2c_client *new_client,
623  const struct i2c_device_id *id)
624 {
625  struct adm9240_data *data;
626  int err;
627 
628  data = devm_kzalloc(&new_client->dev, sizeof(*data), GFP_KERNEL);
629  if (!data)
630  return -ENOMEM;
631 
632  i2c_set_clientdata(new_client, data);
633  mutex_init(&data->update_lock);
634 
635  adm9240_init_client(new_client);
636 
637  /* populate sysfs filesystem */
638  err = sysfs_create_group(&new_client->dev.kobj, &adm9240_group);
639  if (err)
640  return err;
641 
642  data->hwmon_dev = hwmon_device_register(&new_client->dev);
643  if (IS_ERR(data->hwmon_dev)) {
644  err = PTR_ERR(data->hwmon_dev);
645  goto exit_remove;
646  }
647 
648  return 0;
649 
650 exit_remove:
651  sysfs_remove_group(&new_client->dev.kobj, &adm9240_group);
652  return err;
653 }
654 
655 static int adm9240_remove(struct i2c_client *client)
656 {
657  struct adm9240_data *data = i2c_get_clientdata(client);
658 
659  hwmon_device_unregister(data->hwmon_dev);
660  sysfs_remove_group(&client->dev.kobj, &adm9240_group);
661 
662  return 0;
663 }
664 
665 static void adm9240_init_client(struct i2c_client *client)
666 {
667  struct adm9240_data *data = i2c_get_clientdata(client);
668  u8 conf = i2c_smbus_read_byte_data(client, ADM9240_REG_CONFIG);
669  u8 mode = i2c_smbus_read_byte_data(client, ADM9240_REG_TEMP_CONF) & 3;
670 
671  data->vrm = vid_which_vrm(); /* need this to report vid as mV */
672 
673  dev_info(&client->dev, "Using VRM: %d.%d\n", data->vrm / 10,
674  data->vrm % 10);
675 
676  if (conf & 1) { /* measurement cycle running: report state */
677 
678  dev_info(&client->dev, "status: config 0x%02x mode %u\n",
679  conf, mode);
680 
681  } else { /* cold start: open limits before starting chip */
682  int i;
683 
684  for (i = 0; i < 6; i++) {
685  i2c_smbus_write_byte_data(client,
686  ADM9240_REG_IN_MIN(i), 0);
687  i2c_smbus_write_byte_data(client,
688  ADM9240_REG_IN_MAX(i), 255);
689  }
690  i2c_smbus_write_byte_data(client,
691  ADM9240_REG_FAN_MIN(0), 255);
692  i2c_smbus_write_byte_data(client,
693  ADM9240_REG_FAN_MIN(1), 255);
694  i2c_smbus_write_byte_data(client,
695  ADM9240_REG_TEMP_MAX(0), 127);
696  i2c_smbus_write_byte_data(client,
697  ADM9240_REG_TEMP_MAX(1), 127);
698 
699  /* start measurement cycle */
700  i2c_smbus_write_byte_data(client, ADM9240_REG_CONFIG, 1);
701 
702  dev_info(&client->dev, "cold start: config was 0x%02x "
703  "mode %u\n", conf, mode);
704  }
705 }
706 
707 static struct adm9240_data *adm9240_update_device(struct device *dev)
708 {
709  struct i2c_client *client = to_i2c_client(dev);
710  struct adm9240_data *data = i2c_get_clientdata(client);
711  int i;
712 
713  mutex_lock(&data->update_lock);
714 
715  /* minimum measurement cycle: 1.75 seconds */
716  if (time_after(jiffies, data->last_updated_measure + (HZ * 7 / 4))
717  || !data->valid) {
718 
719  for (i = 0; i < 6; i++) { /* read voltages */
720  data->in[i] = i2c_smbus_read_byte_data(client,
721  ADM9240_REG_IN(i));
722  }
723  data->alarms = i2c_smbus_read_byte_data(client,
724  ADM9240_REG_INT(0)) |
725  i2c_smbus_read_byte_data(client,
726  ADM9240_REG_INT(1)) << 8;
727 
728  /*
729  * read temperature: assume temperature changes less than
730  * 0.5'C per two measurement cycles thus ignore possible
731  * but unlikely aliasing error on lsb reading. --Grant
732  */
733  data->temp = ((i2c_smbus_read_byte_data(client,
734  ADM9240_REG_TEMP) << 8) |
735  i2c_smbus_read_byte_data(client,
736  ADM9240_REG_TEMP_CONF)) / 128;
737 
738  for (i = 0; i < 2; i++) { /* read fans */
739  data->fan[i] = i2c_smbus_read_byte_data(client,
740  ADM9240_REG_FAN(i));
741 
742  /* adjust fan clock divider on overflow */
743  if (data->valid && data->fan[i] == 255 &&
744  data->fan_div[i] < 3) {
745 
746  adm9240_write_fan_div(client, i,
747  ++data->fan_div[i]);
748 
749  /* adjust fan_min if active, but not to 0 */
750  if (data->fan_min[i] < 255 &&
751  data->fan_min[i] >= 2)
752  data->fan_min[i] /= 2;
753  }
754  }
755  data->last_updated_measure = jiffies;
756  }
757 
758  /* minimum config reading cycle: 300 seconds */
759  if (time_after(jiffies, data->last_updated_config + (HZ * 300))
760  || !data->valid) {
761 
762  for (i = 0; i < 6; i++) {
763  data->in_min[i] = i2c_smbus_read_byte_data(client,
764  ADM9240_REG_IN_MIN(i));
765  data->in_max[i] = i2c_smbus_read_byte_data(client,
766  ADM9240_REG_IN_MAX(i));
767  }
768  for (i = 0; i < 2; i++) {
769  data->fan_min[i] = i2c_smbus_read_byte_data(client,
770  ADM9240_REG_FAN_MIN(i));
771  }
772  data->temp_max[0] = i2c_smbus_read_byte_data(client,
773  ADM9240_REG_TEMP_MAX(0));
774  data->temp_max[1] = i2c_smbus_read_byte_data(client,
775  ADM9240_REG_TEMP_MAX(1));
776 
777  /* read fan divs and 5-bit VID */
778  i = i2c_smbus_read_byte_data(client, ADM9240_REG_VID_FAN_DIV);
779  data->fan_div[0] = (i >> 4) & 3;
780  data->fan_div[1] = (i >> 6) & 3;
781  data->vid = i & 0x0f;
782  data->vid |= (i2c_smbus_read_byte_data(client,
783  ADM9240_REG_VID4) & 1) << 4;
784  /* read analog out */
785  data->aout = i2c_smbus_read_byte_data(client,
786  ADM9240_REG_ANALOG_OUT);
787 
788  data->last_updated_config = jiffies;
789  data->valid = 1;
790  }
791  mutex_unlock(&data->update_lock);
792  return data;
793 }
794 
795 module_i2c_driver(adm9240_driver);
796 
797 MODULE_AUTHOR("Michiel Rook <[email protected]>, "
798  "Grant Coady <[email protected]> and others");
799 MODULE_DESCRIPTION("ADM9240/DS1780/LM81 driver");
800 MODULE_LICENSE("GPL");
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