aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/hwmon/amc6821.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/hwmon/amc6821.c')
-rw-r--r--drivers/hwmon/amc6821.c1116
1 files changed, 1116 insertions, 0 deletions
diff --git a/drivers/hwmon/amc6821.c b/drivers/hwmon/amc6821.c
new file mode 100644
index 000000000000..1c89d922d619
--- /dev/null
+++ b/drivers/hwmon/amc6821.c
@@ -0,0 +1,1116 @@
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@linutronix.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 = 0; /*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 = strict_strtol(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 = strict_strtol(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 = strict_strtol(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 = strict_strtol(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 = strict_strtol(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 = strict_strtol(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 = strict_strtol(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 mutex_unlock(&data->update_lock);
690 count = -EINVAL;
691 goto EXIT;
692 }
693 if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF4, config)) {
694 dev_err(&client->dev,
695 "Configuration register write error, aborting.\n");
696 count = -EIO;
697 }
698EXIT:
699 mutex_unlock(&data->update_lock);
700 return count;
701}
702
703
704
705static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO,
706 get_temp, NULL, IDX_TEMP1_INPUT);
707static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO | S_IWUSR, get_temp,
708 set_temp, IDX_TEMP1_MIN);
709static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR, get_temp,
710 set_temp, IDX_TEMP1_MAX);
711static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO | S_IWUSR, get_temp,
712 set_temp, IDX_TEMP1_CRIT);
713static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO,
714 get_temp_alarm, NULL, IDX_TEMP1_MIN);
715static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO,
716 get_temp_alarm, NULL, IDX_TEMP1_MAX);
717static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO,
718 get_temp_alarm, NULL, IDX_TEMP1_CRIT);
719static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO | S_IWUSR,
720 get_temp, NULL, IDX_TEMP2_INPUT);
721static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO | S_IWUSR, get_temp,
722 set_temp, IDX_TEMP2_MIN);
723static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO | S_IWUSR, get_temp,
724 set_temp, IDX_TEMP2_MAX);
725static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO | S_IWUSR, get_temp,
726 set_temp, IDX_TEMP2_CRIT);
727static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO,
728 get_temp2_fault, NULL, 0);
729static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO,
730 get_temp_alarm, NULL, IDX_TEMP2_MIN);
731static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO,
732 get_temp_alarm, NULL, IDX_TEMP2_MAX);
733static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO,
734 get_temp_alarm, NULL, IDX_TEMP2_CRIT);
735static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, get_fan, NULL, IDX_FAN1_INPUT);
736static SENSOR_DEVICE_ATTR(fan1_min, S_IRUGO | S_IWUSR,
737 get_fan, set_fan, IDX_FAN1_MIN);
738static SENSOR_DEVICE_ATTR(fan1_max, S_IRUGO | S_IWUSR,
739 get_fan, set_fan, IDX_FAN1_MAX);
740static SENSOR_DEVICE_ATTR(fan1_fault, S_IRUGO, get_fan1_fault, NULL, 0);
741static SENSOR_DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR,
742 get_fan1_div, set_fan1_div, 0);
743
744static SENSOR_DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, get_pwm1, set_pwm1, 0);
745static SENSOR_DEVICE_ATTR(pwm1_enable, S_IWUSR | S_IRUGO,
746 get_pwm1_enable, set_pwm1_enable, 0);
747static SENSOR_DEVICE_ATTR(pwm1_auto_point1_pwm, S_IRUGO,
748 get_pwm1_auto_point_pwm, NULL, 0);
749static SENSOR_DEVICE_ATTR(pwm1_auto_point2_pwm, S_IWUSR | S_IRUGO,
750 get_pwm1_auto_point_pwm, set_pwm1_auto_point_pwm, 1);
751static SENSOR_DEVICE_ATTR(pwm1_auto_point3_pwm, S_IRUGO,
752 get_pwm1_auto_point_pwm, NULL, 2);
753static SENSOR_DEVICE_ATTR(pwm1_auto_channels_temp, S_IRUGO,
754 get_pwm1_auto_channels_temp, NULL, 0);
755static SENSOR_DEVICE_ATTR_2(temp1_auto_point1_temp, S_IRUGO,
756 get_temp_auto_point_temp, NULL, 1, 0);
757static SENSOR_DEVICE_ATTR_2(temp1_auto_point2_temp, S_IWUSR | S_IRUGO,
758 get_temp_auto_point_temp, set_temp_auto_point_temp, 1, 1);
759static SENSOR_DEVICE_ATTR_2(temp1_auto_point3_temp, S_IWUSR | S_IRUGO,
760 get_temp_auto_point_temp, set_temp_auto_point_temp, 1, 2);
761
762static SENSOR_DEVICE_ATTR_2(temp2_auto_point1_temp, S_IWUSR | S_IRUGO,
763 get_temp_auto_point_temp, set_temp_auto_point_temp, 2, 0);
764static SENSOR_DEVICE_ATTR_2(temp2_auto_point2_temp, S_IWUSR | S_IRUGO,
765 get_temp_auto_point_temp, set_temp_auto_point_temp, 2, 1);
766static SENSOR_DEVICE_ATTR_2(temp2_auto_point3_temp, S_IWUSR | S_IRUGO,
767 get_temp_auto_point_temp, set_temp_auto_point_temp, 2, 2);
768
769
770
771static struct attribute *amc6821_attrs[] = {
772 &sensor_dev_attr_temp1_input.dev_attr.attr,
773 &sensor_dev_attr_temp1_min.dev_attr.attr,
774 &sensor_dev_attr_temp1_max.dev_attr.attr,
775 &sensor_dev_attr_temp1_crit.dev_attr.attr,
776 &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
777 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
778 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
779 &sensor_dev_attr_temp2_input.dev_attr.attr,
780 &sensor_dev_attr_temp2_min.dev_attr.attr,
781 &sensor_dev_attr_temp2_max.dev_attr.attr,
782 &sensor_dev_attr_temp2_crit.dev_attr.attr,
783 &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
784 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
785 &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
786 &sensor_dev_attr_temp2_fault.dev_attr.attr,
787 &sensor_dev_attr_fan1_input.dev_attr.attr,
788 &sensor_dev_attr_fan1_min.dev_attr.attr,
789 &sensor_dev_attr_fan1_max.dev_attr.attr,
790 &sensor_dev_attr_fan1_fault.dev_attr.attr,
791 &sensor_dev_attr_fan1_div.dev_attr.attr,
792 &sensor_dev_attr_pwm1.dev_attr.attr,
793 &sensor_dev_attr_pwm1_enable.dev_attr.attr,
794 &sensor_dev_attr_pwm1_auto_channels_temp.dev_attr.attr,
795 &sensor_dev_attr_pwm1_auto_point1_pwm.dev_attr.attr,
796 &sensor_dev_attr_pwm1_auto_point2_pwm.dev_attr.attr,
797 &sensor_dev_attr_pwm1_auto_point3_pwm.dev_attr.attr,
798 &sensor_dev_attr_temp1_auto_point1_temp.dev_attr.attr,
799 &sensor_dev_attr_temp1_auto_point2_temp.dev_attr.attr,
800 &sensor_dev_attr_temp1_auto_point3_temp.dev_attr.attr,
801 &sensor_dev_attr_temp2_auto_point1_temp.dev_attr.attr,
802 &sensor_dev_attr_temp2_auto_point2_temp.dev_attr.attr,
803 &sensor_dev_attr_temp2_auto_point3_temp.dev_attr.attr,
804 NULL
805};
806
807static struct attribute_group amc6821_attr_grp = {
808 .attrs = amc6821_attrs,
809};
810
811
812
813/* Return 0 if detection is successful, -ENODEV otherwise */
814static int amc6821_detect(
815 struct i2c_client *client,
816 struct i2c_board_info *info)
817{
818 struct i2c_adapter *adapter = client->adapter;
819 int address = client->addr;
820 int dev_id, comp_id;
821
822 dev_dbg(&adapter->dev, "amc6821_detect called.\n");
823
824 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
825 dev_dbg(&adapter->dev,
826 "amc6821: I2C bus doesn't support byte mode, "
827 "skipping.\n");
828 return -ENODEV;
829 }
830
831 dev_id = i2c_smbus_read_byte_data(client, AMC6821_REG_DEV_ID);
832 comp_id = i2c_smbus_read_byte_data(client, AMC6821_REG_COMP_ID);
833 if (dev_id != 0x21 || comp_id != 0x49) {
834 dev_dbg(&adapter->dev,
835 "amc6821: detection failed at 0x%02x.\n",
836 address);
837 return -ENODEV;
838 }
839
840 /* Bit 7 of the address register is ignored, so we can check the
841 ID registers again */
842 dev_id = i2c_smbus_read_byte_data(client, 0x80 | AMC6821_REG_DEV_ID);
843 comp_id = i2c_smbus_read_byte_data(client, 0x80 | AMC6821_REG_COMP_ID);
844 if (dev_id != 0x21 || comp_id != 0x49) {
845 dev_dbg(&adapter->dev,
846 "amc6821: detection failed at 0x%02x.\n",
847 address);
848 return -ENODEV;
849 }
850
851 dev_info(&adapter->dev, "amc6821: chip found at 0x%02x.\n", address);
852 strlcpy(info->type, "amc6821", I2C_NAME_SIZE);
853
854 return 0;
855}
856
857static int amc6821_probe(
858 struct i2c_client *client,
859 const struct i2c_device_id *id)
860{
861 struct amc6821_data *data;
862 int err;
863
864 data = kzalloc(sizeof(struct amc6821_data), GFP_KERNEL);
865 if (!data) {
866 dev_err(&client->dev, "out of memory.\n");
867 return -ENOMEM;
868 }
869
870
871 i2c_set_clientdata(client, data);
872 mutex_init(&data->update_lock);
873
874 /*
875 * Initialize the amc6821 chip
876 */
877 err = amc6821_init_client(client);
878 if (err)
879 goto err_free;
880
881 err = sysfs_create_group(&client->dev.kobj, &amc6821_attr_grp);
882 if (err)
883 goto err_free;
884
885 data->hwmon_dev = hwmon_device_register(&client->dev);
886 if (!IS_ERR(data->hwmon_dev))
887 return 0;
888
889 err = PTR_ERR(data->hwmon_dev);
890 dev_err(&client->dev, "error registering hwmon device.\n");
891 sysfs_remove_group(&client->dev.kobj, &amc6821_attr_grp);
892err_free:
893 kfree(data);
894 return err;
895}
896
897static int amc6821_remove(struct i2c_client *client)
898{
899 struct amc6821_data *data = i2c_get_clientdata(client);
900
901 hwmon_device_unregister(data->hwmon_dev);
902 sysfs_remove_group(&client->dev.kobj, &amc6821_attr_grp);
903
904 kfree(data);
905
906 return 0;
907}
908
909
910static int amc6821_init_client(struct i2c_client *client)
911{
912 int config;
913 int err = -EIO;
914
915 if (init) {
916 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF4);
917
918 if (config < 0) {
919 dev_err(&client->dev,
920 "Error reading configuration register, aborting.\n");
921 return err;
922 }
923
924 config |= AMC6821_CONF4_MODE;
925
926 if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF4,
927 config)) {
928 dev_err(&client->dev,
929 "Configuration register write error, aborting.\n");
930 return err;
931 }
932
933 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF3);
934
935 if (config < 0) {
936 dev_err(&client->dev,
937 "Error reading configuration register, aborting.\n");
938 return err;
939 }
940
941 dev_info(&client->dev, "Revision %d\n", config & 0x0f);
942
943 config &= ~AMC6821_CONF3_THERM_FAN_EN;
944
945 if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF3,
946 config)) {
947 dev_err(&client->dev,
948 "Configuration register write error, aborting.\n");
949 return err;
950 }
951
952 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF2);
953
954 if (config < 0) {
955 dev_err(&client->dev,
956 "Error reading configuration register, aborting.\n");
957 return err;
958 }
959
960 config &= ~AMC6821_CONF2_RTFIE;
961 config &= ~AMC6821_CONF2_LTOIE;
962 config &= ~AMC6821_CONF2_RTOIE;
963 if (i2c_smbus_write_byte_data(client,
964 AMC6821_REG_CONF2, config)) {
965 dev_err(&client->dev,
966 "Configuration register write error, aborting.\n");
967 return err;
968 }
969
970 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF1);
971
972 if (config < 0) {
973 dev_err(&client->dev,
974 "Error reading configuration register, aborting.\n");
975 return err;
976 }
977
978 config &= ~AMC6821_CONF1_THERMOVIE;
979 config &= ~AMC6821_CONF1_FANIE;
980 config |= AMC6821_CONF1_START;
981 if (pwminv)
982 config |= AMC6821_CONF1_PWMINV;
983 else
984 config &= ~AMC6821_CONF1_PWMINV;
985
986 if (i2c_smbus_write_byte_data(
987 client, AMC6821_REG_CONF1, config)) {
988 dev_err(&client->dev,
989 "Configuration register write error, aborting.\n");
990 return err;
991 }
992 }
993 return 0;
994}
995
996
997static struct amc6821_data *amc6821_update_device(struct device *dev)
998{
999 struct i2c_client *client = to_i2c_client(dev);
1000 struct amc6821_data *data = i2c_get_clientdata(client);
1001 int timeout = HZ;
1002 u8 reg;
1003 int i;
1004
1005 mutex_lock(&data->update_lock);
1006
1007 if (time_after(jiffies, data->last_updated + timeout) ||
1008 !data->valid) {
1009
1010 for (i = 0; i < TEMP_IDX_LEN; i++)
1011 data->temp[i] = i2c_smbus_read_byte_data(client,
1012 temp_reg[i]);
1013
1014 data->stat1 = i2c_smbus_read_byte_data(client,
1015 AMC6821_REG_STAT1);
1016 data->stat2 = i2c_smbus_read_byte_data(client,
1017 AMC6821_REG_STAT2);
1018
1019 data->pwm1 = i2c_smbus_read_byte_data(client,
1020 AMC6821_REG_DCY);
1021 for (i = 0; i < FAN1_IDX_LEN; i++) {
1022 data->fan[i] = i2c_smbus_read_byte_data(
1023 client,
1024 fan_reg_low[i]);
1025 data->fan[i] += i2c_smbus_read_byte_data(
1026 client,
1027 fan_reg_hi[i]) << 8;
1028 }
1029 data->fan1_div = i2c_smbus_read_byte_data(client,
1030 AMC6821_REG_CONF4);
1031 data->fan1_div = data->fan1_div & AMC6821_CONF4_PSPR ? 4 : 2;
1032
1033 data->pwm1_auto_point_pwm[0] = 0;
1034 data->pwm1_auto_point_pwm[2] = 255;
1035 data->pwm1_auto_point_pwm[1] = i2c_smbus_read_byte_data(client,
1036 AMC6821_REG_DCY_LOW_TEMP);
1037
1038 data->temp1_auto_point_temp[0] =
1039 i2c_smbus_read_byte_data(client,
1040 AMC6821_REG_PSV_TEMP);
1041 data->temp2_auto_point_temp[0] =
1042 data->temp1_auto_point_temp[0];
1043 reg = i2c_smbus_read_byte_data(client,
1044 AMC6821_REG_LTEMP_FAN_CTRL);
1045 data->temp1_auto_point_temp[1] = (reg & 0xF8) >> 1;
1046 reg &= 0x07;
1047 reg = 0x20 >> reg;
1048 if (reg > 0)
1049 data->temp1_auto_point_temp[2] =
1050 data->temp1_auto_point_temp[1] +
1051 (data->pwm1_auto_point_pwm[2] -
1052 data->pwm1_auto_point_pwm[1]) / reg;
1053 else
1054 data->temp1_auto_point_temp[2] = 255;
1055
1056 reg = i2c_smbus_read_byte_data(client,
1057 AMC6821_REG_RTEMP_FAN_CTRL);
1058 data->temp2_auto_point_temp[1] = (reg & 0xF8) >> 1;
1059 reg &= 0x07;
1060 reg = 0x20 >> reg;
1061 if (reg > 0)
1062 data->temp2_auto_point_temp[2] =
1063 data->temp2_auto_point_temp[1] +
1064 (data->pwm1_auto_point_pwm[2] -
1065 data->pwm1_auto_point_pwm[1]) / reg;
1066 else
1067 data->temp2_auto_point_temp[2] = 255;
1068
1069 reg = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF1);
1070 reg = (reg >> 5) & 0x3;
1071 switch (reg) {
1072 case 0: /*open loop: software sets pwm1*/
1073 data->pwm1_auto_channels_temp = 0;
1074 data->pwm1_enable = 1;
1075 break;
1076 case 2: /*closed loop: remote T (temp2)*/
1077 data->pwm1_auto_channels_temp = 2;
1078 data->pwm1_enable = 2;
1079 break;
1080 case 3: /*closed loop: local and remote T (temp2)*/
1081 data->pwm1_auto_channels_temp = 3;
1082 data->pwm1_enable = 3;
1083 break;
1084 case 1: /*semi-open loop: software sets rpm, chip controls pwm1,
1085 *currently not implemented
1086 */
1087 data->pwm1_auto_channels_temp = 0;
1088 data->pwm1_enable = 0;
1089 break;
1090 }
1091
1092 data->last_updated = jiffies;
1093 data->valid = 1;
1094 }
1095 mutex_unlock(&data->update_lock);
1096 return data;
1097}
1098
1099
1100static int __init amc6821_init(void)
1101{
1102 return i2c_add_driver(&amc6821_driver);
1103}
1104
1105static void __exit amc6821_exit(void)
1106{
1107 i2c_del_driver(&amc6821_driver);
1108}
1109
1110module_init(amc6821_init);
1111module_exit(amc6821_exit);
1112
1113
1114MODULE_LICENSE("GPL");
1115MODULE_AUTHOR("T. Mertelj <tomaz.mertelj@guest.arnes.si>");
1116MODULE_DESCRIPTION("Texas Instruments amc6821 hwmon driver");
generated by cgit v1.2.2 (git 2.25.0) at 2025-12-27 03:10:02 -0500