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amc6821.c
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1 /*
2  * amc6821.c - Part of lm_sensors, Linux kernel modules for hardware
3  * monitoring
4  * Copyright (C) 2009 T. Mertelj <[email protected]>
5  *
6  * Based on max6650.c:
7  * Copyright (C) 2007 Hans J. Koch <[email protected]>
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 
25 #include <linux/kernel.h> /* Needed for KERN_INFO */
26 #include <linux/module.h>
27 #include <linux/init.h>
28 #include <linux/slab.h>
29 #include <linux/jiffies.h>
30 #include <linux/i2c.h>
31 #include <linux/hwmon.h>
32 #include <linux/hwmon-sysfs.h>
33 #include <linux/err.h>
34 #include <linux/mutex.h>
35 
36 
37 /*
38  * Addresses to scan.
39  */
40 
41 static const unsigned short normal_i2c[] = {0x18, 0x19, 0x1a, 0x2c, 0x2d, 0x2e,
42  0x4c, 0x4d, 0x4e, I2C_CLIENT_END};
43 
44 
45 
46 /*
47  * Insmod parameters
48  */
49 
50 static int pwminv; /*Inverted PWM output. */
51 module_param(pwminv, int, S_IRUGO);
52 
53 static int init = 1; /*Power-on initialization.*/
54 module_param(init, int, S_IRUGO);
55 
56 
57 enum chips { amc6821 };
58 
59 #define AMC6821_REG_DEV_ID 0x3D
60 #define AMC6821_REG_COMP_ID 0x3E
61 #define AMC6821_REG_CONF1 0x00
62 #define AMC6821_REG_CONF2 0x01
63 #define AMC6821_REG_CONF3 0x3F
64 #define AMC6821_REG_CONF4 0x04
65 #define AMC6821_REG_STAT1 0x02
66 #define AMC6821_REG_STAT2 0x03
67 #define AMC6821_REG_TDATA_LOW 0x08
68 #define AMC6821_REG_TDATA_HI 0x09
69 #define AMC6821_REG_LTEMP_HI 0x0A
70 #define AMC6821_REG_RTEMP_HI 0x0B
71 #define AMC6821_REG_LTEMP_LIMIT_MIN 0x15
72 #define AMC6821_REG_LTEMP_LIMIT_MAX 0x14
73 #define AMC6821_REG_RTEMP_LIMIT_MIN 0x19
74 #define AMC6821_REG_RTEMP_LIMIT_MAX 0x18
75 #define AMC6821_REG_LTEMP_CRIT 0x1B
76 #define AMC6821_REG_RTEMP_CRIT 0x1D
77 #define AMC6821_REG_PSV_TEMP 0x1C
78 #define AMC6821_REG_DCY 0x22
79 #define AMC6821_REG_LTEMP_FAN_CTRL 0x24
80 #define AMC6821_REG_RTEMP_FAN_CTRL 0x25
81 #define AMC6821_REG_DCY_LOW_TEMP 0x21
82 
83 #define AMC6821_REG_TACH_LLIMITL 0x10
84 #define AMC6821_REG_TACH_LLIMITH 0x11
85 #define AMC6821_REG_TACH_HLIMITL 0x12
86 #define AMC6821_REG_TACH_HLIMITH 0x13
87 
88 #define AMC6821_CONF1_START 0x01
89 #define AMC6821_CONF1_FAN_INT_EN 0x02
90 #define AMC6821_CONF1_FANIE 0x04
91 #define AMC6821_CONF1_PWMINV 0x08
92 #define AMC6821_CONF1_FAN_FAULT_EN 0x10
93 #define AMC6821_CONF1_FDRC0 0x20
94 #define AMC6821_CONF1_FDRC1 0x40
95 #define AMC6821_CONF1_THERMOVIE 0x80
96 
97 #define AMC6821_CONF2_PWM_EN 0x01
98 #define AMC6821_CONF2_TACH_MODE 0x02
99 #define AMC6821_CONF2_TACH_EN 0x04
100 #define AMC6821_CONF2_RTFIE 0x08
101 #define AMC6821_CONF2_LTOIE 0x10
102 #define AMC6821_CONF2_RTOIE 0x20
103 #define AMC6821_CONF2_PSVIE 0x40
104 #define AMC6821_CONF2_RST 0x80
105 
106 #define AMC6821_CONF3_THERM_FAN_EN 0x80
107 #define AMC6821_CONF3_REV_MASK 0x0F
108 
109 #define AMC6821_CONF4_OVREN 0x10
110 #define AMC6821_CONF4_TACH_FAST 0x20
111 #define AMC6821_CONF4_PSPR 0x40
112 #define AMC6821_CONF4_MODE 0x80
113 
114 #define AMC6821_STAT1_RPM_ALARM 0x01
115 #define AMC6821_STAT1_FANS 0x02
116 #define AMC6821_STAT1_RTH 0x04
117 #define AMC6821_STAT1_RTL 0x08
118 #define AMC6821_STAT1_R_THERM 0x10
119 #define AMC6821_STAT1_RTF 0x20
120 #define AMC6821_STAT1_LTH 0x40
121 #define AMC6821_STAT1_LTL 0x80
122 
123 #define AMC6821_STAT2_RTC 0x08
124 #define AMC6821_STAT2_LTC 0x10
125 #define AMC6821_STAT2_LPSV 0x20
126 #define AMC6821_STAT2_L_THERM 0x40
127 #define AMC6821_STAT2_THERM_IN 0x80
128 
129 enum {IDX_TEMP1_INPUT = 0, IDX_TEMP1_MIN, IDX_TEMP1_MAX,
130  IDX_TEMP1_CRIT, IDX_TEMP2_INPUT, IDX_TEMP2_MIN,
131  IDX_TEMP2_MAX, IDX_TEMP2_CRIT,
132  TEMP_IDX_LEN, };
133 
134 static const u8 temp_reg[] = {AMC6821_REG_LTEMP_HI,
135  AMC6821_REG_LTEMP_LIMIT_MIN,
136  AMC6821_REG_LTEMP_LIMIT_MAX,
137  AMC6821_REG_LTEMP_CRIT,
138  AMC6821_REG_RTEMP_HI,
139  AMC6821_REG_RTEMP_LIMIT_MIN,
140  AMC6821_REG_RTEMP_LIMIT_MAX,
141  AMC6821_REG_RTEMP_CRIT, };
142 
143 enum {IDX_FAN1_INPUT = 0, IDX_FAN1_MIN, IDX_FAN1_MAX,
144  FAN1_IDX_LEN, };
145 
146 static const u8 fan_reg_low[] = {AMC6821_REG_TDATA_LOW,
147  AMC6821_REG_TACH_LLIMITL,
148  AMC6821_REG_TACH_HLIMITL, };
149 
150 
151 static const u8 fan_reg_hi[] = {AMC6821_REG_TDATA_HI,
152  AMC6821_REG_TACH_LLIMITH,
153  AMC6821_REG_TACH_HLIMITH, };
154 
155 static int amc6821_probe(
156  struct i2c_client *client,
157  const struct i2c_device_id *id);
158 static int amc6821_detect(
159  struct i2c_client *client,
160  struct i2c_board_info *info);
161 static int amc6821_init_client(struct i2c_client *client);
162 static int amc6821_remove(struct i2c_client *client);
163 static struct amc6821_data *amc6821_update_device(struct device *dev);
164 
165 /*
166  * Driver data (common to all clients)
167  */
168 
169 static const struct i2c_device_id amc6821_id[] = {
170  { "amc6821", amc6821 },
171  { }
172 };
173 
174 MODULE_DEVICE_TABLE(i2c, amc6821_id);
175 
176 static struct i2c_driver amc6821_driver = {
177  .class = I2C_CLASS_HWMON,
178  .driver = {
179  .name = "amc6821",
180  },
181  .probe = amc6821_probe,
182  .remove = amc6821_remove,
183  .id_table = amc6821_id,
184  .detect = amc6821_detect,
185  .address_list = normal_i2c,
186 };
187 
188 
189 /*
190  * Client data (each client gets its own)
191  */
192 
193 struct amc6821_data {
194  struct device *hwmon_dev;
195  struct mutex update_lock;
196  char valid; /* zero until following fields are valid */
197  unsigned long last_updated; /* in jiffies */
198 
199  /* register values */
200  int temp[TEMP_IDX_LEN];
201 
202  u16 fan[FAN1_IDX_LEN];
203  u8 fan1_div;
204 
205  u8 pwm1;
206  u8 temp1_auto_point_temp[3];
207  u8 temp2_auto_point_temp[3];
208  u8 pwm1_auto_point_pwm[3];
209  u8 pwm1_enable;
210  u8 pwm1_auto_channels_temp;
211 
212  u8 stat1;
213  u8 stat2;
214 };
215 
216 
217 static ssize_t get_temp(
218  struct device *dev,
219  struct device_attribute *devattr,
220  char *buf)
221 {
222  struct amc6821_data *data = amc6821_update_device(dev);
223  int ix = to_sensor_dev_attr(devattr)->index;
224 
225  return sprintf(buf, "%d\n", data->temp[ix] * 1000);
226 }
227 
228 
229 
230 static ssize_t set_temp(
231  struct device *dev,
232  struct device_attribute *attr,
233  const char *buf,
234  size_t count)
235 {
236  struct i2c_client *client = to_i2c_client(dev);
237  struct amc6821_data *data = i2c_get_clientdata(client);
238  int ix = to_sensor_dev_attr(attr)->index;
239  long val;
240 
241  int ret = kstrtol(buf, 10, &val);
242  if (ret)
243  return ret;
244  val = SENSORS_LIMIT(val / 1000, -128, 127);
245 
246  mutex_lock(&data->update_lock);
247  data->temp[ix] = val;
248  if (i2c_smbus_write_byte_data(client, temp_reg[ix], data->temp[ix])) {
249  dev_err(&client->dev, "Register write error, aborting.\n");
250  count = -EIO;
251  }
252  mutex_unlock(&data->update_lock);
253  return count;
254 }
255 
256 
257 
258 
259 static ssize_t get_temp_alarm(
260  struct device *dev,
261  struct device_attribute *devattr,
262  char *buf)
263 {
264  struct amc6821_data *data = amc6821_update_device(dev);
265  int ix = to_sensor_dev_attr(devattr)->index;
266  u8 flag;
267 
268  switch (ix) {
269  case IDX_TEMP1_MIN:
270  flag = data->stat1 & AMC6821_STAT1_LTL;
271  break;
272  case IDX_TEMP1_MAX:
273  flag = data->stat1 & AMC6821_STAT1_LTH;
274  break;
275  case IDX_TEMP1_CRIT:
276  flag = data->stat2 & AMC6821_STAT2_LTC;
277  break;
278  case IDX_TEMP2_MIN:
279  flag = data->stat1 & AMC6821_STAT1_RTL;
280  break;
281  case IDX_TEMP2_MAX:
282  flag = data->stat1 & AMC6821_STAT1_RTH;
283  break;
284  case IDX_TEMP2_CRIT:
285  flag = data->stat2 & AMC6821_STAT2_RTC;
286  break;
287  default:
288  dev_dbg(dev, "Unknown attr->index (%d).\n", ix);
289  return -EINVAL;
290  }
291  if (flag)
292  return sprintf(buf, "1");
293  else
294  return sprintf(buf, "0");
295 }
296 
297 
298 
299 
300 static ssize_t get_temp2_fault(
301  struct device *dev,
302  struct device_attribute *devattr,
303  char *buf)
304 {
305  struct amc6821_data *data = amc6821_update_device(dev);
306  if (data->stat1 & AMC6821_STAT1_RTF)
307  return sprintf(buf, "1");
308  else
309  return sprintf(buf, "0");
310 }
311 
312 static ssize_t get_pwm1(
313  struct device *dev,
314  struct device_attribute *devattr,
315  char *buf)
316 {
317  struct amc6821_data *data = amc6821_update_device(dev);
318  return sprintf(buf, "%d\n", data->pwm1);
319 }
320 
321 static ssize_t set_pwm1(
322  struct device *dev,
323  struct device_attribute *devattr,
324  const char *buf,
325  size_t count)
326 {
327  struct i2c_client *client = to_i2c_client(dev);
328  struct amc6821_data *data = i2c_get_clientdata(client);
329  long val;
330  int ret = kstrtol(buf, 10, &val);
331  if (ret)
332  return ret;
333 
334  mutex_lock(&data->update_lock);
335  data->pwm1 = SENSORS_LIMIT(val , 0, 255);
336  i2c_smbus_write_byte_data(client, AMC6821_REG_DCY, data->pwm1);
337  mutex_unlock(&data->update_lock);
338  return count;
339 }
340 
341 static ssize_t get_pwm1_enable(
342  struct device *dev,
343  struct device_attribute *devattr,
344  char *buf)
345 {
346  struct amc6821_data *data = amc6821_update_device(dev);
347  return sprintf(buf, "%d\n", data->pwm1_enable);
348 }
349 
350 static ssize_t set_pwm1_enable(
351  struct device *dev,
352  struct device_attribute *attr,
353  const char *buf,
354  size_t count)
355 {
356  struct i2c_client *client = to_i2c_client(dev);
357  struct amc6821_data *data = i2c_get_clientdata(client);
358  long val;
359  int config = kstrtol(buf, 10, &val);
360  if (config)
361  return config;
362 
363  config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF1);
364  if (config < 0) {
365  dev_err(&client->dev,
366  "Error reading configuration register, aborting.\n");
367  return -EIO;
368  }
369 
370  switch (val) {
371  case 1:
372  config &= ~AMC6821_CONF1_FDRC0;
373  config &= ~AMC6821_CONF1_FDRC1;
374  break;
375  case 2:
376  config &= ~AMC6821_CONF1_FDRC0;
377  config |= AMC6821_CONF1_FDRC1;
378  break;
379  case 3:
380  config |= AMC6821_CONF1_FDRC0;
381  config |= AMC6821_CONF1_FDRC1;
382  break;
383  default:
384  return -EINVAL;
385  }
386  mutex_lock(&data->update_lock);
387  if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF1, config)) {
388  dev_err(&client->dev,
389  "Configuration register write error, aborting.\n");
390  count = -EIO;
391  }
392  mutex_unlock(&data->update_lock);
393  return count;
394 }
395 
396 
397 static ssize_t get_pwm1_auto_channels_temp(
398  struct device *dev,
399  struct device_attribute *devattr,
400  char *buf)
401 {
402  struct amc6821_data *data = amc6821_update_device(dev);
403  return sprintf(buf, "%d\n", data->pwm1_auto_channels_temp);
404 }
405 
406 
407 static ssize_t get_temp_auto_point_temp(
408  struct device *dev,
409  struct device_attribute *devattr,
410  char *buf)
411 {
412  int ix = to_sensor_dev_attr_2(devattr)->index;
413  int nr = to_sensor_dev_attr_2(devattr)->nr;
414  struct amc6821_data *data = amc6821_update_device(dev);
415  switch (nr) {
416  case 1:
417  return sprintf(buf, "%d\n",
418  data->temp1_auto_point_temp[ix] * 1000);
419  break;
420  case 2:
421  return sprintf(buf, "%d\n",
422  data->temp2_auto_point_temp[ix] * 1000);
423  break;
424  default:
425  dev_dbg(dev, "Unknown attr->nr (%d).\n", nr);
426  return -EINVAL;
427  }
428 }
429 
430 
431 static ssize_t get_pwm1_auto_point_pwm(
432  struct device *dev,
433  struct device_attribute *devattr,
434  char *buf)
435 {
436  int ix = to_sensor_dev_attr(devattr)->index;
437  struct amc6821_data *data = amc6821_update_device(dev);
438  return sprintf(buf, "%d\n", data->pwm1_auto_point_pwm[ix]);
439 }
440 
441 
442 static inline ssize_t set_slope_register(struct i2c_client *client,
443  u8 reg,
444  u8 dpwm,
445  u8 *ptemp)
446 {
447  int dt;
448  u8 tmp;
449 
450  dt = ptemp[2]-ptemp[1];
451  for (tmp = 4; tmp > 0; tmp--) {
452  if (dt * (0x20 >> tmp) >= dpwm)
453  break;
454  }
455  tmp |= (ptemp[1] & 0x7C) << 1;
456  if (i2c_smbus_write_byte_data(client,
457  reg, tmp)) {
458  dev_err(&client->dev, "Register write error, aborting.\n");
459  return -EIO;
460  }
461  return 0;
462 }
463 
464 
465 
466 static ssize_t set_temp_auto_point_temp(
467  struct device *dev,
468  struct device_attribute *attr,
469  const char *buf,
470  size_t count)
471 {
472  struct i2c_client *client = to_i2c_client(dev);
473  struct amc6821_data *data = amc6821_update_device(dev);
474  int ix = to_sensor_dev_attr_2(attr)->index;
475  int nr = to_sensor_dev_attr_2(attr)->nr;
476  u8 *ptemp;
477  u8 reg;
478  int dpwm;
479  long val;
480  int ret = kstrtol(buf, 10, &val);
481  if (ret)
482  return ret;
483 
484  switch (nr) {
485  case 1:
486  ptemp = data->temp1_auto_point_temp;
487  reg = AMC6821_REG_LTEMP_FAN_CTRL;
488  break;
489  case 2:
490  ptemp = data->temp2_auto_point_temp;
491  reg = AMC6821_REG_RTEMP_FAN_CTRL;
492  break;
493  default:
494  dev_dbg(dev, "Unknown attr->nr (%d).\n", nr);
495  return -EINVAL;
496  }
497 
498  data->valid = 0;
499  mutex_lock(&data->update_lock);
500  switch (ix) {
501  case 0:
502  ptemp[0] = SENSORS_LIMIT(val / 1000, 0,
503  data->temp1_auto_point_temp[1]);
504  ptemp[0] = SENSORS_LIMIT(ptemp[0], 0,
505  data->temp2_auto_point_temp[1]);
506  ptemp[0] = SENSORS_LIMIT(ptemp[0], 0, 63);
507  if (i2c_smbus_write_byte_data(
508  client,
509  AMC6821_REG_PSV_TEMP,
510  ptemp[0])) {
511  dev_err(&client->dev,
512  "Register write error, aborting.\n");
513  count = -EIO;
514  }
515  goto EXIT;
516  break;
517  case 1:
518  ptemp[1] = SENSORS_LIMIT(
519  val / 1000,
520  (ptemp[0] & 0x7C) + 4,
521  124);
522  ptemp[1] &= 0x7C;
523  ptemp[2] = SENSORS_LIMIT(
524  ptemp[2], ptemp[1] + 1,
525  255);
526  break;
527  case 2:
528  ptemp[2] = SENSORS_LIMIT(
529  val / 1000,
530  ptemp[1]+1,
531  255);
532  break;
533  default:
534  dev_dbg(dev, "Unknown attr->index (%d).\n", ix);
535  count = -EINVAL;
536  goto EXIT;
537  }
538  dpwm = data->pwm1_auto_point_pwm[2] - data->pwm1_auto_point_pwm[1];
539  if (set_slope_register(client, reg, dpwm, ptemp))
540  count = -EIO;
541 
542 EXIT:
543  mutex_unlock(&data->update_lock);
544  return count;
545 }
546 
547 
548 
549 static ssize_t set_pwm1_auto_point_pwm(
550  struct device *dev,
551  struct device_attribute *attr,
552  const char *buf,
553  size_t count)
554 {
555  struct i2c_client *client = to_i2c_client(dev);
556  struct amc6821_data *data = i2c_get_clientdata(client);
557  int dpwm;
558  long val;
559  int ret = kstrtol(buf, 10, &val);
560  if (ret)
561  return ret;
562 
563  mutex_lock(&data->update_lock);
564  data->pwm1_auto_point_pwm[1] = SENSORS_LIMIT(val, 0, 254);
565  if (i2c_smbus_write_byte_data(client, AMC6821_REG_DCY_LOW_TEMP,
566  data->pwm1_auto_point_pwm[1])) {
567  dev_err(&client->dev, "Register write error, aborting.\n");
568  count = -EIO;
569  goto EXIT;
570  }
571  dpwm = data->pwm1_auto_point_pwm[2] - data->pwm1_auto_point_pwm[1];
572  if (set_slope_register(client, AMC6821_REG_LTEMP_FAN_CTRL, dpwm,
573  data->temp1_auto_point_temp)) {
574  count = -EIO;
575  goto EXIT;
576  }
577  if (set_slope_register(client, AMC6821_REG_RTEMP_FAN_CTRL, dpwm,
578  data->temp2_auto_point_temp)) {
579  count = -EIO;
580  goto EXIT;
581  }
582 
583 EXIT:
584  data->valid = 0;
585  mutex_unlock(&data->update_lock);
586  return count;
587 }
588 
589 static ssize_t get_fan(
590  struct device *dev,
591  struct device_attribute *devattr,
592  char *buf)
593 {
594  struct amc6821_data *data = amc6821_update_device(dev);
595  int ix = to_sensor_dev_attr(devattr)->index;
596  if (0 == data->fan[ix])
597  return sprintf(buf, "0");
598  return sprintf(buf, "%d\n", (int)(6000000 / data->fan[ix]));
599 }
600 
601 
602 
603 static ssize_t get_fan1_fault(
604  struct device *dev,
605  struct device_attribute *devattr,
606  char *buf)
607 {
608  struct amc6821_data *data = amc6821_update_device(dev);
609  if (data->stat1 & AMC6821_STAT1_FANS)
610  return sprintf(buf, "1");
611  else
612  return sprintf(buf, "0");
613 }
614 
615 
616 
617 static ssize_t set_fan(
618  struct device *dev,
619  struct device_attribute *attr,
620  const char *buf, size_t count)
621 {
622  struct i2c_client *client = to_i2c_client(dev);
623  struct amc6821_data *data = i2c_get_clientdata(client);
624  long val;
625  int ix = to_sensor_dev_attr(attr)->index;
626  int ret = kstrtol(buf, 10, &val);
627  if (ret)
628  return ret;
629  val = 1 > val ? 0xFFFF : 6000000/val;
630 
631  mutex_lock(&data->update_lock);
632  data->fan[ix] = (u16) SENSORS_LIMIT(val, 1, 0xFFFF);
633  if (i2c_smbus_write_byte_data(client, fan_reg_low[ix],
634  data->fan[ix] & 0xFF)) {
635  dev_err(&client->dev, "Register write error, aborting.\n");
636  count = -EIO;
637  goto EXIT;
638  }
639  if (i2c_smbus_write_byte_data(client,
640  fan_reg_hi[ix], data->fan[ix] >> 8)) {
641  dev_err(&client->dev, "Register write error, aborting.\n");
642  count = -EIO;
643  }
644 EXIT:
645  mutex_unlock(&data->update_lock);
646  return count;
647 }
648 
649 
650 
651 static ssize_t get_fan1_div(
652  struct device *dev,
653  struct device_attribute *devattr,
654  char *buf)
655 {
656  struct amc6821_data *data = amc6821_update_device(dev);
657  return sprintf(buf, "%d\n", data->fan1_div);
658 }
659 
660 static ssize_t set_fan1_div(
661  struct device *dev,
662  struct device_attribute *attr,
663  const char *buf, size_t count)
664 {
665  struct i2c_client *client = to_i2c_client(dev);
666  struct amc6821_data *data = i2c_get_clientdata(client);
667  long val;
668  int config = kstrtol(buf, 10, &val);
669  if (config)
670  return config;
671 
672  config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF4);
673  if (config < 0) {
674  dev_err(&client->dev,
675  "Error reading configuration register, aborting.\n");
676  return -EIO;
677  }
678  mutex_lock(&data->update_lock);
679  switch (val) {
680  case 2:
681  config &= ~AMC6821_CONF4_PSPR;
682  data->fan1_div = 2;
683  break;
684  case 4:
685  config |= AMC6821_CONF4_PSPR;
686  data->fan1_div = 4;
687  break;
688  default:
689  count = -EINVAL;
690  goto EXIT;
691  }
692  if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF4, config)) {
693  dev_err(&client->dev,
694  "Configuration register write error, aborting.\n");
695  count = -EIO;
696  }
697 EXIT:
698  mutex_unlock(&data->update_lock);
699  return count;
700 }
701 
702 
703 
704 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO,
705  get_temp, NULL, IDX_TEMP1_INPUT);
706 static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO | S_IWUSR, get_temp,
707  set_temp, IDX_TEMP1_MIN);
708 static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR, get_temp,
709  set_temp, IDX_TEMP1_MAX);
710 static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO | S_IWUSR, get_temp,
711  set_temp, IDX_TEMP1_CRIT);
712 static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO,
713  get_temp_alarm, NULL, IDX_TEMP1_MIN);
714 static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO,
715  get_temp_alarm, NULL, IDX_TEMP1_MAX);
716 static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO,
717  get_temp_alarm, NULL, IDX_TEMP1_CRIT);
718 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO | S_IWUSR,
719  get_temp, NULL, IDX_TEMP2_INPUT);
720 static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO | S_IWUSR, get_temp,
721  set_temp, IDX_TEMP2_MIN);
722 static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO | S_IWUSR, get_temp,
723  set_temp, IDX_TEMP2_MAX);
724 static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO | S_IWUSR, get_temp,
725  set_temp, IDX_TEMP2_CRIT);
726 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO,
727  get_temp2_fault, NULL, 0);
728 static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO,
729  get_temp_alarm, NULL, IDX_TEMP2_MIN);
730 static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO,
731  get_temp_alarm, NULL, IDX_TEMP2_MAX);
732 static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO,
733  get_temp_alarm, NULL, IDX_TEMP2_CRIT);
734 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, get_fan, NULL, IDX_FAN1_INPUT);
735 static SENSOR_DEVICE_ATTR(fan1_min, S_IRUGO | S_IWUSR,
736  get_fan, set_fan, IDX_FAN1_MIN);
737 static SENSOR_DEVICE_ATTR(fan1_max, S_IRUGO | S_IWUSR,
738  get_fan, set_fan, IDX_FAN1_MAX);
739 static SENSOR_DEVICE_ATTR(fan1_fault, S_IRUGO, get_fan1_fault, NULL, 0);
740 static SENSOR_DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR,
741  get_fan1_div, set_fan1_div, 0);
742 
743 static SENSOR_DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, get_pwm1, set_pwm1, 0);
744 static SENSOR_DEVICE_ATTR(pwm1_enable, S_IWUSR | S_IRUGO,
745  get_pwm1_enable, set_pwm1_enable, 0);
746 static SENSOR_DEVICE_ATTR(pwm1_auto_point1_pwm, S_IRUGO,
747  get_pwm1_auto_point_pwm, NULL, 0);
748 static SENSOR_DEVICE_ATTR(pwm1_auto_point2_pwm, S_IWUSR | S_IRUGO,
749  get_pwm1_auto_point_pwm, set_pwm1_auto_point_pwm, 1);
750 static SENSOR_DEVICE_ATTR(pwm1_auto_point3_pwm, S_IRUGO,
751  get_pwm1_auto_point_pwm, NULL, 2);
752 static SENSOR_DEVICE_ATTR(pwm1_auto_channels_temp, S_IRUGO,
753  get_pwm1_auto_channels_temp, NULL, 0);
754 static SENSOR_DEVICE_ATTR_2(temp1_auto_point1_temp, S_IRUGO,
755  get_temp_auto_point_temp, NULL, 1, 0);
756 static SENSOR_DEVICE_ATTR_2(temp1_auto_point2_temp, S_IWUSR | S_IRUGO,
757  get_temp_auto_point_temp, set_temp_auto_point_temp, 1, 1);
758 static SENSOR_DEVICE_ATTR_2(temp1_auto_point3_temp, S_IWUSR | S_IRUGO,
759  get_temp_auto_point_temp, set_temp_auto_point_temp, 1, 2);
760 
761 static SENSOR_DEVICE_ATTR_2(temp2_auto_point1_temp, S_IWUSR | S_IRUGO,
762  get_temp_auto_point_temp, set_temp_auto_point_temp, 2, 0);
763 static SENSOR_DEVICE_ATTR_2(temp2_auto_point2_temp, S_IWUSR | S_IRUGO,
764  get_temp_auto_point_temp, set_temp_auto_point_temp, 2, 1);
765 static SENSOR_DEVICE_ATTR_2(temp2_auto_point3_temp, S_IWUSR | S_IRUGO,
766  get_temp_auto_point_temp, set_temp_auto_point_temp, 2, 2);
767 
768 
769 
770 static struct attribute *amc6821_attrs[] = {
771  &sensor_dev_attr_temp1_input.dev_attr.attr,
772  &sensor_dev_attr_temp1_min.dev_attr.attr,
773  &sensor_dev_attr_temp1_max.dev_attr.attr,
774  &sensor_dev_attr_temp1_crit.dev_attr.attr,
775  &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
776  &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
777  &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
778  &sensor_dev_attr_temp2_input.dev_attr.attr,
779  &sensor_dev_attr_temp2_min.dev_attr.attr,
780  &sensor_dev_attr_temp2_max.dev_attr.attr,
781  &sensor_dev_attr_temp2_crit.dev_attr.attr,
782  &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
783  &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
784  &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
785  &sensor_dev_attr_temp2_fault.dev_attr.attr,
786  &sensor_dev_attr_fan1_input.dev_attr.attr,
787  &sensor_dev_attr_fan1_min.dev_attr.attr,
788  &sensor_dev_attr_fan1_max.dev_attr.attr,
789  &sensor_dev_attr_fan1_fault.dev_attr.attr,
790  &sensor_dev_attr_fan1_div.dev_attr.attr,
791  &sensor_dev_attr_pwm1.dev_attr.attr,
792  &sensor_dev_attr_pwm1_enable.dev_attr.attr,
793  &sensor_dev_attr_pwm1_auto_channels_temp.dev_attr.attr,
794  &sensor_dev_attr_pwm1_auto_point1_pwm.dev_attr.attr,
795  &sensor_dev_attr_pwm1_auto_point2_pwm.dev_attr.attr,
796  &sensor_dev_attr_pwm1_auto_point3_pwm.dev_attr.attr,
797  &sensor_dev_attr_temp1_auto_point1_temp.dev_attr.attr,
798  &sensor_dev_attr_temp1_auto_point2_temp.dev_attr.attr,
799  &sensor_dev_attr_temp1_auto_point3_temp.dev_attr.attr,
800  &sensor_dev_attr_temp2_auto_point1_temp.dev_attr.attr,
801  &sensor_dev_attr_temp2_auto_point2_temp.dev_attr.attr,
802  &sensor_dev_attr_temp2_auto_point3_temp.dev_attr.attr,
803  NULL
804 };
805 
806 static struct attribute_group amc6821_attr_grp = {
807  .attrs = amc6821_attrs,
808 };
809 
810 
811 
812 /* Return 0 if detection is successful, -ENODEV otherwise */
813 static int amc6821_detect(
814  struct i2c_client *client,
815  struct i2c_board_info *info)
816 {
817  struct i2c_adapter *adapter = client->adapter;
818  int address = client->addr;
819  int dev_id, comp_id;
820 
821  dev_dbg(&adapter->dev, "amc6821_detect called.\n");
822 
823  if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
824  dev_dbg(&adapter->dev,
825  "amc6821: I2C bus doesn't support byte mode, "
826  "skipping.\n");
827  return -ENODEV;
828  }
829 
830  dev_id = i2c_smbus_read_byte_data(client, AMC6821_REG_DEV_ID);
831  comp_id = i2c_smbus_read_byte_data(client, AMC6821_REG_COMP_ID);
832  if (dev_id != 0x21 || comp_id != 0x49) {
833  dev_dbg(&adapter->dev,
834  "amc6821: detection failed at 0x%02x.\n",
835  address);
836  return -ENODEV;
837  }
838 
839  /*
840  * Bit 7 of the address register is ignored, so we can check the
841  * ID registers again
842  */
843  dev_id = i2c_smbus_read_byte_data(client, 0x80 | AMC6821_REG_DEV_ID);
844  comp_id = i2c_smbus_read_byte_data(client, 0x80 | AMC6821_REG_COMP_ID);
845  if (dev_id != 0x21 || comp_id != 0x49) {
846  dev_dbg(&adapter->dev,
847  "amc6821: detection failed at 0x%02x.\n",
848  address);
849  return -ENODEV;
850  }
851 
852  dev_info(&adapter->dev, "amc6821: chip found at 0x%02x.\n", address);
853  strlcpy(info->type, "amc6821", I2C_NAME_SIZE);
854 
855  return 0;
856 }
857 
858 static int amc6821_probe(
859  struct i2c_client *client,
860  const struct i2c_device_id *id)
861 {
862  struct amc6821_data *data;
863  int err;
864 
865  data = devm_kzalloc(&client->dev, sizeof(struct amc6821_data),
866  GFP_KERNEL);
867  if (!data)
868  return -ENOMEM;
869 
870  i2c_set_clientdata(client, data);
871  mutex_init(&data->update_lock);
872 
873  /*
874  * Initialize the amc6821 chip
875  */
876  err = amc6821_init_client(client);
877  if (err)
878  return err;
879 
880  err = sysfs_create_group(&client->dev.kobj, &amc6821_attr_grp);
881  if (err)
882  return err;
883 
884  data->hwmon_dev = hwmon_device_register(&client->dev);
885  if (!IS_ERR(data->hwmon_dev))
886  return 0;
887 
888  err = PTR_ERR(data->hwmon_dev);
889  dev_err(&client->dev, "error registering hwmon device.\n");
890  sysfs_remove_group(&client->dev.kobj, &amc6821_attr_grp);
891  return err;
892 }
893 
894 static int amc6821_remove(struct i2c_client *client)
895 {
896  struct amc6821_data *data = i2c_get_clientdata(client);
897 
898  hwmon_device_unregister(data->hwmon_dev);
899  sysfs_remove_group(&client->dev.kobj, &amc6821_attr_grp);
900 
901  return 0;
902 }
903 
904 
905 static int amc6821_init_client(struct i2c_client *client)
906 {
907  int config;
908  int err = -EIO;
909 
910  if (init) {
911  config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF4);
912 
913  if (config < 0) {
914  dev_err(&client->dev,
915  "Error reading configuration register, aborting.\n");
916  return err;
917  }
918 
919  config |= AMC6821_CONF4_MODE;
920 
921  if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF4,
922  config)) {
923  dev_err(&client->dev,
924  "Configuration register write error, aborting.\n");
925  return err;
926  }
927 
928  config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF3);
929 
930  if (config < 0) {
931  dev_err(&client->dev,
932  "Error reading configuration register, aborting.\n");
933  return err;
934  }
935 
936  dev_info(&client->dev, "Revision %d\n", config & 0x0f);
937 
938  config &= ~AMC6821_CONF3_THERM_FAN_EN;
939 
940  if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF3,
941  config)) {
942  dev_err(&client->dev,
943  "Configuration register write error, aborting.\n");
944  return err;
945  }
946 
947  config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF2);
948 
949  if (config < 0) {
950  dev_err(&client->dev,
951  "Error reading configuration register, aborting.\n");
952  return err;
953  }
954 
955  config &= ~AMC6821_CONF2_RTFIE;
956  config &= ~AMC6821_CONF2_LTOIE;
957  config &= ~AMC6821_CONF2_RTOIE;
958  if (i2c_smbus_write_byte_data(client,
959  AMC6821_REG_CONF2, config)) {
960  dev_err(&client->dev,
961  "Configuration register write error, aborting.\n");
962  return err;
963  }
964 
965  config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF1);
966 
967  if (config < 0) {
968  dev_err(&client->dev,
969  "Error reading configuration register, aborting.\n");
970  return err;
971  }
972 
973  config &= ~AMC6821_CONF1_THERMOVIE;
974  config &= ~AMC6821_CONF1_FANIE;
975  config |= AMC6821_CONF1_START;
976  if (pwminv)
977  config |= AMC6821_CONF1_PWMINV;
978  else
979  config &= ~AMC6821_CONF1_PWMINV;
980 
981  if (i2c_smbus_write_byte_data(
982  client, AMC6821_REG_CONF1, config)) {
983  dev_err(&client->dev,
984  "Configuration register write error, aborting.\n");
985  return err;
986  }
987  }
988  return 0;
989 }
990 
991 
992 static struct amc6821_data *amc6821_update_device(struct device *dev)
993 {
994  struct i2c_client *client = to_i2c_client(dev);
995  struct amc6821_data *data = i2c_get_clientdata(client);
996  int timeout = HZ;
997  u8 reg;
998  int i;
999 
1000  mutex_lock(&data->update_lock);
1001 
1002  if (time_after(jiffies, data->last_updated + timeout) ||
1003  !data->valid) {
1004 
1005  for (i = 0; i < TEMP_IDX_LEN; i++)
1006  data->temp[i] = i2c_smbus_read_byte_data(client,
1007  temp_reg[i]);
1008 
1009  data->stat1 = i2c_smbus_read_byte_data(client,
1010  AMC6821_REG_STAT1);
1011  data->stat2 = i2c_smbus_read_byte_data(client,
1012  AMC6821_REG_STAT2);
1013 
1014  data->pwm1 = i2c_smbus_read_byte_data(client,
1015  AMC6821_REG_DCY);
1016  for (i = 0; i < FAN1_IDX_LEN; i++) {
1017  data->fan[i] = i2c_smbus_read_byte_data(
1018  client,
1019  fan_reg_low[i]);
1020  data->fan[i] += i2c_smbus_read_byte_data(
1021  client,
1022  fan_reg_hi[i]) << 8;
1023  }
1024  data->fan1_div = i2c_smbus_read_byte_data(client,
1025  AMC6821_REG_CONF4);
1026  data->fan1_div = data->fan1_div & AMC6821_CONF4_PSPR ? 4 : 2;
1027 
1028  data->pwm1_auto_point_pwm[0] = 0;
1029  data->pwm1_auto_point_pwm[2] = 255;
1030  data->pwm1_auto_point_pwm[1] = i2c_smbus_read_byte_data(client,
1031  AMC6821_REG_DCY_LOW_TEMP);
1032 
1033  data->temp1_auto_point_temp[0] =
1034  i2c_smbus_read_byte_data(client,
1035  AMC6821_REG_PSV_TEMP);
1036  data->temp2_auto_point_temp[0] =
1037  data->temp1_auto_point_temp[0];
1038  reg = i2c_smbus_read_byte_data(client,
1039  AMC6821_REG_LTEMP_FAN_CTRL);
1040  data->temp1_auto_point_temp[1] = (reg & 0xF8) >> 1;
1041  reg &= 0x07;
1042  reg = 0x20 >> reg;
1043  if (reg > 0)
1044  data->temp1_auto_point_temp[2] =
1045  data->temp1_auto_point_temp[1] +
1046  (data->pwm1_auto_point_pwm[2] -
1047  data->pwm1_auto_point_pwm[1]) / reg;
1048  else
1049  data->temp1_auto_point_temp[2] = 255;
1050 
1051  reg = i2c_smbus_read_byte_data(client,
1052  AMC6821_REG_RTEMP_FAN_CTRL);
1053  data->temp2_auto_point_temp[1] = (reg & 0xF8) >> 1;
1054  reg &= 0x07;
1055  reg = 0x20 >> reg;
1056  if (reg > 0)
1057  data->temp2_auto_point_temp[2] =
1058  data->temp2_auto_point_temp[1] +
1059  (data->pwm1_auto_point_pwm[2] -
1060  data->pwm1_auto_point_pwm[1]) / reg;
1061  else
1062  data->temp2_auto_point_temp[2] = 255;
1063 
1064  reg = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF1);
1065  reg = (reg >> 5) & 0x3;
1066  switch (reg) {
1067  case 0: /*open loop: software sets pwm1*/
1068  data->pwm1_auto_channels_temp = 0;
1069  data->pwm1_enable = 1;
1070  break;
1071  case 2: /*closed loop: remote T (temp2)*/
1072  data->pwm1_auto_channels_temp = 2;
1073  data->pwm1_enable = 2;
1074  break;
1075  case 3: /*closed loop: local and remote T (temp2)*/
1076  data->pwm1_auto_channels_temp = 3;
1077  data->pwm1_enable = 3;
1078  break;
1079  case 1: /*
1080  * semi-open loop: software sets rpm, chip controls
1081  * pwm1, currently not implemented
1082  */
1083  data->pwm1_auto_channels_temp = 0;
1084  data->pwm1_enable = 0;
1085  break;
1086  }
1087 
1088  data->last_updated = jiffies;
1089  data->valid = 1;
1090  }
1091  mutex_unlock(&data->update_lock);
1092  return data;
1093 }
1094 
1095 module_i2c_driver(amc6821_driver);
1096 
1097 MODULE_LICENSE("GPL");
1098 MODULE_AUTHOR("T. Mertelj <[email protected]>");
1099 MODULE_DESCRIPTION("Texas Instruments amc6821 hwmon driver");
Generated on Thu Jan 10 2013 13:34:38 for Linux Kernel by   doxygen 1.8.2