Loading...
1/*
2 * amc6821.c - Part of lm_sensors, Linux kernel modules for hardware
3 * monitoring
4 * Copyright (C) 2009 T. Mertelj <tomaz.mertelj@guest.arnes.si>
5 *
6 * Based on max6650.c:
7 * Copyright (C) 2007 Hans J. Koch <hjk@hansjkoch.de>
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
41static 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
50static int pwminv; /*Inverted PWM output. */
51module_param(pwminv, int, S_IRUGO);
52
53static int init = 1; /*Power-on initialization.*/
54module_param(init, int, S_IRUGO);
55
56
57enum 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
129enum {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
134static 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
143enum {IDX_FAN1_INPUT = 0, IDX_FAN1_MIN, IDX_FAN1_MAX,
144 FAN1_IDX_LEN, };
145
146static const u8 fan_reg_low[] = {AMC6821_REG_TDATA_LOW,
147 AMC6821_REG_TACH_LLIMITL,
148 AMC6821_REG_TACH_HLIMITL, };
149
150
151static const u8 fan_reg_hi[] = {AMC6821_REG_TDATA_HI,
152 AMC6821_REG_TACH_LLIMITH,
153 AMC6821_REG_TACH_HLIMITH, };
154
155static int amc6821_probe(
156 struct i2c_client *client,
157 const struct i2c_device_id *id);
158static int amc6821_detect(
159 struct i2c_client *client,
160 struct i2c_board_info *info);
161static int amc6821_init_client(struct i2c_client *client);
162static int amc6821_remove(struct i2c_client *client);
163static struct amc6821_data *amc6821_update_device(struct device *dev);
164
165/*
166 * Driver data (common to all clients)
167 */
168
169static const struct i2c_device_id amc6821_id[] = {
170 { "amc6821", amc6821 },
171 { }
172};
173
174MODULE_DEVICE_TABLE(i2c, amc6821_id);
175
176static 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
193struct 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
217static 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
230static 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
259static 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
300static 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
312static 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
321static 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
341static 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
350static 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
397static 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
407static 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
431static 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
442static 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
466static 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
542EXIT:
543 mutex_unlock(&data->update_lock);
544 return count;
545}
546
547
548
549static 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
583EXIT:
584 data->valid = 0;
585 mutex_unlock(&data->update_lock);
586 return count;
587}
588
589static 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
603static 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
617static 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 }
644EXIT:
645 mutex_unlock(&data->update_lock);
646 return count;
647}
648
649
650
651static 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
660static 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 }
697EXIT:
698 mutex_unlock(&data->update_lock);
699 return count;
700}
701
702
703
704static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO,
705 get_temp, NULL, IDX_TEMP1_INPUT);
706static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO | S_IWUSR, get_temp,
707 set_temp, IDX_TEMP1_MIN);
708static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR, get_temp,
709 set_temp, IDX_TEMP1_MAX);
710static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO | S_IWUSR, get_temp,
711 set_temp, IDX_TEMP1_CRIT);
712static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO,
713 get_temp_alarm, NULL, IDX_TEMP1_MIN);
714static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO,
715 get_temp_alarm, NULL, IDX_TEMP1_MAX);
716static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO,
717 get_temp_alarm, NULL, IDX_TEMP1_CRIT);
718static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO | S_IWUSR,
719 get_temp, NULL, IDX_TEMP2_INPUT);
720static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO | S_IWUSR, get_temp,
721 set_temp, IDX_TEMP2_MIN);
722static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO | S_IWUSR, get_temp,
723 set_temp, IDX_TEMP2_MAX);
724static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO | S_IWUSR, get_temp,
725 set_temp, IDX_TEMP2_CRIT);
726static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO,
727 get_temp2_fault, NULL, 0);
728static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO,
729 get_temp_alarm, NULL, IDX_TEMP2_MIN);
730static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO,
731 get_temp_alarm, NULL, IDX_TEMP2_MAX);
732static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO,
733 get_temp_alarm, NULL, IDX_TEMP2_CRIT);
734static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, get_fan, NULL, IDX_FAN1_INPUT);
735static SENSOR_DEVICE_ATTR(fan1_min, S_IRUGO | S_IWUSR,
736 get_fan, set_fan, IDX_FAN1_MIN);
737static SENSOR_DEVICE_ATTR(fan1_max, S_IRUGO | S_IWUSR,
738 get_fan, set_fan, IDX_FAN1_MAX);
739static SENSOR_DEVICE_ATTR(fan1_fault, S_IRUGO, get_fan1_fault, NULL, 0);
740static SENSOR_DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR,
741 get_fan1_div, set_fan1_div, 0);
742
743static SENSOR_DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, get_pwm1, set_pwm1, 0);
744static SENSOR_DEVICE_ATTR(pwm1_enable, S_IWUSR | S_IRUGO,
745 get_pwm1_enable, set_pwm1_enable, 0);
746static SENSOR_DEVICE_ATTR(pwm1_auto_point1_pwm, S_IRUGO,
747 get_pwm1_auto_point_pwm, NULL, 0);
748static SENSOR_DEVICE_ATTR(pwm1_auto_point2_pwm, S_IWUSR | S_IRUGO,
749 get_pwm1_auto_point_pwm, set_pwm1_auto_point_pwm, 1);
750static SENSOR_DEVICE_ATTR(pwm1_auto_point3_pwm, S_IRUGO,
751 get_pwm1_auto_point_pwm, NULL, 2);
752static SENSOR_DEVICE_ATTR(pwm1_auto_channels_temp, S_IRUGO,
753 get_pwm1_auto_channels_temp, NULL, 0);
754static SENSOR_DEVICE_ATTR_2(temp1_auto_point1_temp, S_IRUGO,
755 get_temp_auto_point_temp, NULL, 1, 0);
756static 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);
758static 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
761static 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);
763static 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);
765static 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
770static 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
806static struct attribute_group amc6821_attr_grp = {
807 .attrs = amc6821_attrs,
808};
809
810
811
812/* Return 0 if detection is successful, -ENODEV otherwise */
813static 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
858static 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 = kzalloc(sizeof(struct amc6821_data), GFP_KERNEL);
866 if (!data) {
867 dev_err(&client->dev, "out of memory.\n");
868 return -ENOMEM;
869 }
870
871
872 i2c_set_clientdata(client, data);
873 mutex_init(&data->update_lock);
874
875 /*
876 * Initialize the amc6821 chip
877 */
878 err = amc6821_init_client(client);
879 if (err)
880 goto err_free;
881
882 err = sysfs_create_group(&client->dev.kobj, &amc6821_attr_grp);
883 if (err)
884 goto err_free;
885
886 data->hwmon_dev = hwmon_device_register(&client->dev);
887 if (!IS_ERR(data->hwmon_dev))
888 return 0;
889
890 err = PTR_ERR(data->hwmon_dev);
891 dev_err(&client->dev, "error registering hwmon device.\n");
892 sysfs_remove_group(&client->dev.kobj, &amc6821_attr_grp);
893err_free:
894 kfree(data);
895 return err;
896}
897
898static int amc6821_remove(struct i2c_client *client)
899{
900 struct amc6821_data *data = i2c_get_clientdata(client);
901
902 hwmon_device_unregister(data->hwmon_dev);
903 sysfs_remove_group(&client->dev.kobj, &amc6821_attr_grp);
904
905 kfree(data);
906
907 return 0;
908}
909
910
911static int amc6821_init_client(struct i2c_client *client)
912{
913 int config;
914 int err = -EIO;
915
916 if (init) {
917 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF4);
918
919 if (config < 0) {
920 dev_err(&client->dev,
921 "Error reading configuration register, aborting.\n");
922 return err;
923 }
924
925 config |= AMC6821_CONF4_MODE;
926
927 if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF4,
928 config)) {
929 dev_err(&client->dev,
930 "Configuration register write error, aborting.\n");
931 return err;
932 }
933
934 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF3);
935
936 if (config < 0) {
937 dev_err(&client->dev,
938 "Error reading configuration register, aborting.\n");
939 return err;
940 }
941
942 dev_info(&client->dev, "Revision %d\n", config & 0x0f);
943
944 config &= ~AMC6821_CONF3_THERM_FAN_EN;
945
946 if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF3,
947 config)) {
948 dev_err(&client->dev,
949 "Configuration register write error, aborting.\n");
950 return err;
951 }
952
953 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF2);
954
955 if (config < 0) {
956 dev_err(&client->dev,
957 "Error reading configuration register, aborting.\n");
958 return err;
959 }
960
961 config &= ~AMC6821_CONF2_RTFIE;
962 config &= ~AMC6821_CONF2_LTOIE;
963 config &= ~AMC6821_CONF2_RTOIE;
964 if (i2c_smbus_write_byte_data(client,
965 AMC6821_REG_CONF2, config)) {
966 dev_err(&client->dev,
967 "Configuration register write error, aborting.\n");
968 return err;
969 }
970
971 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF1);
972
973 if (config < 0) {
974 dev_err(&client->dev,
975 "Error reading configuration register, aborting.\n");
976 return err;
977 }
978
979 config &= ~AMC6821_CONF1_THERMOVIE;
980 config &= ~AMC6821_CONF1_FANIE;
981 config |= AMC6821_CONF1_START;
982 if (pwminv)
983 config |= AMC6821_CONF1_PWMINV;
984 else
985 config &= ~AMC6821_CONF1_PWMINV;
986
987 if (i2c_smbus_write_byte_data(
988 client, AMC6821_REG_CONF1, config)) {
989 dev_err(&client->dev,
990 "Configuration register write error, aborting.\n");
991 return err;
992 }
993 }
994 return 0;
995}
996
997
998static struct amc6821_data *amc6821_update_device(struct device *dev)
999{
1000 struct i2c_client *client = to_i2c_client(dev);
1001 struct amc6821_data *data = i2c_get_clientdata(client);
1002 int timeout = HZ;
1003 u8 reg;
1004 int i;
1005
1006 mutex_lock(&data->update_lock);
1007
1008 if (time_after(jiffies, data->last_updated + timeout) ||
1009 !data->valid) {
1010
1011 for (i = 0; i < TEMP_IDX_LEN; i++)
1012 data->temp[i] = i2c_smbus_read_byte_data(client,
1013 temp_reg[i]);
1014
1015 data->stat1 = i2c_smbus_read_byte_data(client,
1016 AMC6821_REG_STAT1);
1017 data->stat2 = i2c_smbus_read_byte_data(client,
1018 AMC6821_REG_STAT2);
1019
1020 data->pwm1 = i2c_smbus_read_byte_data(client,
1021 AMC6821_REG_DCY);
1022 for (i = 0; i < FAN1_IDX_LEN; i++) {
1023 data->fan[i] = i2c_smbus_read_byte_data(
1024 client,
1025 fan_reg_low[i]);
1026 data->fan[i] += i2c_smbus_read_byte_data(
1027 client,
1028 fan_reg_hi[i]) << 8;
1029 }
1030 data->fan1_div = i2c_smbus_read_byte_data(client,
1031 AMC6821_REG_CONF4);
1032 data->fan1_div = data->fan1_div & AMC6821_CONF4_PSPR ? 4 : 2;
1033
1034 data->pwm1_auto_point_pwm[0] = 0;
1035 data->pwm1_auto_point_pwm[2] = 255;
1036 data->pwm1_auto_point_pwm[1] = i2c_smbus_read_byte_data(client,
1037 AMC6821_REG_DCY_LOW_TEMP);
1038
1039 data->temp1_auto_point_temp[0] =
1040 i2c_smbus_read_byte_data(client,
1041 AMC6821_REG_PSV_TEMP);
1042 data->temp2_auto_point_temp[0] =
1043 data->temp1_auto_point_temp[0];
1044 reg = i2c_smbus_read_byte_data(client,
1045 AMC6821_REG_LTEMP_FAN_CTRL);
1046 data->temp1_auto_point_temp[1] = (reg & 0xF8) >> 1;
1047 reg &= 0x07;
1048 reg = 0x20 >> reg;
1049 if (reg > 0)
1050 data->temp1_auto_point_temp[2] =
1051 data->temp1_auto_point_temp[1] +
1052 (data->pwm1_auto_point_pwm[2] -
1053 data->pwm1_auto_point_pwm[1]) / reg;
1054 else
1055 data->temp1_auto_point_temp[2] = 255;
1056
1057 reg = i2c_smbus_read_byte_data(client,
1058 AMC6821_REG_RTEMP_FAN_CTRL);
1059 data->temp2_auto_point_temp[1] = (reg & 0xF8) >> 1;
1060 reg &= 0x07;
1061 reg = 0x20 >> reg;
1062 if (reg > 0)
1063 data->temp2_auto_point_temp[2] =
1064 data->temp2_auto_point_temp[1] +
1065 (data->pwm1_auto_point_pwm[2] -
1066 data->pwm1_auto_point_pwm[1]) / reg;
1067 else
1068 data->temp2_auto_point_temp[2] = 255;
1069
1070 reg = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF1);
1071 reg = (reg >> 5) & 0x3;
1072 switch (reg) {
1073 case 0: /*open loop: software sets pwm1*/
1074 data->pwm1_auto_channels_temp = 0;
1075 data->pwm1_enable = 1;
1076 break;
1077 case 2: /*closed loop: remote T (temp2)*/
1078 data->pwm1_auto_channels_temp = 2;
1079 data->pwm1_enable = 2;
1080 break;
1081 case 3: /*closed loop: local and remote T (temp2)*/
1082 data->pwm1_auto_channels_temp = 3;
1083 data->pwm1_enable = 3;
1084 break;
1085 case 1: /*
1086 * semi-open loop: software sets rpm, chip controls
1087 * pwm1, currently not implemented
1088 */
1089 data->pwm1_auto_channels_temp = 0;
1090 data->pwm1_enable = 0;
1091 break;
1092 }
1093
1094 data->last_updated = jiffies;
1095 data->valid = 1;
1096 }
1097 mutex_unlock(&data->update_lock);
1098 return data;
1099}
1100
1101module_i2c_driver(amc6821_driver);
1102
1103MODULE_LICENSE("GPL");
1104MODULE_AUTHOR("T. Mertelj <tomaz.mertelj@guest.arnes.si>");
1105MODULE_DESCRIPTION("Texas Instruments amc6821 hwmon driver");