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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 <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 = 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 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 /* Bit 7 of the address register is ignored, so we can check the
840 ID registers again */
841 dev_id = i2c_smbus_read_byte_data(client, 0x80 | AMC6821_REG_DEV_ID);
842 comp_id = i2c_smbus_read_byte_data(client, 0x80 | AMC6821_REG_COMP_ID);
843 if (dev_id != 0x21 || comp_id != 0x49) {
844 dev_dbg(&adapter->dev,
845 "amc6821: detection failed at 0x%02x.\n",
846 address);
847 return -ENODEV;
848 }
849
850 dev_info(&adapter->dev, "amc6821: chip found at 0x%02x.\n", address);
851 strlcpy(info->type, "amc6821", I2C_NAME_SIZE);
852
853 return 0;
854}
855
856static int amc6821_probe(
857 struct i2c_client *client,
858 const struct i2c_device_id *id)
859{
860 struct amc6821_data *data;
861 int err;
862
863 data = kzalloc(sizeof(struct amc6821_data), GFP_KERNEL);
864 if (!data) {
865 dev_err(&client->dev, "out of memory.\n");
866 return -ENOMEM;
867 }
868
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 goto err_free;
879
880 err = sysfs_create_group(&client->dev.kobj, &amc6821_attr_grp);
881 if (err)
882 goto err_free;
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);
891err_free:
892 kfree(data);
893 return err;
894}
895
896static int amc6821_remove(struct i2c_client *client)
897{
898 struct amc6821_data *data = i2c_get_clientdata(client);
899
900 hwmon_device_unregister(data->hwmon_dev);
901 sysfs_remove_group(&client->dev.kobj, &amc6821_attr_grp);
902
903 kfree(data);
904
905 return 0;
906}
907
908
909static int amc6821_init_client(struct i2c_client *client)
910{
911 int config;
912 int err = -EIO;
913
914 if (init) {
915 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF4);
916
917 if (config < 0) {
918 dev_err(&client->dev,
919 "Error reading configuration register, aborting.\n");
920 return err;
921 }
922
923 config |= AMC6821_CONF4_MODE;
924
925 if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF4,
926 config)) {
927 dev_err(&client->dev,
928 "Configuration register write error, aborting.\n");
929 return err;
930 }
931
932 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF3);
933
934 if (config < 0) {
935 dev_err(&client->dev,
936 "Error reading configuration register, aborting.\n");
937 return err;
938 }
939
940 dev_info(&client->dev, "Revision %d\n", config & 0x0f);
941
942 config &= ~AMC6821_CONF3_THERM_FAN_EN;
943
944 if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF3,
945 config)) {
946 dev_err(&client->dev,
947 "Configuration register write error, aborting.\n");
948 return err;
949 }
950
951 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF2);
952
953 if (config < 0) {
954 dev_err(&client->dev,
955 "Error reading configuration register, aborting.\n");
956 return err;
957 }
958
959 config &= ~AMC6821_CONF2_RTFIE;
960 config &= ~AMC6821_CONF2_LTOIE;
961 config &= ~AMC6821_CONF2_RTOIE;
962 if (i2c_smbus_write_byte_data(client,
963 AMC6821_REG_CONF2, config)) {
964 dev_err(&client->dev,
965 "Configuration register write error, aborting.\n");
966 return err;
967 }
968
969 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF1);
970
971 if (config < 0) {
972 dev_err(&client->dev,
973 "Error reading configuration register, aborting.\n");
974 return err;
975 }
976
977 config &= ~AMC6821_CONF1_THERMOVIE;
978 config &= ~AMC6821_CONF1_FANIE;
979 config |= AMC6821_CONF1_START;
980 if (pwminv)
981 config |= AMC6821_CONF1_PWMINV;
982 else
983 config &= ~AMC6821_CONF1_PWMINV;
984
985 if (i2c_smbus_write_byte_data(
986 client, AMC6821_REG_CONF1, config)) {
987 dev_err(&client->dev,
988 "Configuration register write error, aborting.\n");
989 return err;
990 }
991 }
992 return 0;
993}
994
995
996static struct amc6821_data *amc6821_update_device(struct device *dev)
997{
998 struct i2c_client *client = to_i2c_client(dev);
999 struct amc6821_data *data = i2c_get_clientdata(client);
1000 int timeout = HZ;
1001 u8 reg;
1002 int i;
1003
1004 mutex_lock(&data->update_lock);
1005
1006 if (time_after(jiffies, data->last_updated + timeout) ||
1007 !data->valid) {
1008
1009 for (i = 0; i < TEMP_IDX_LEN; i++)
1010 data->temp[i] = i2c_smbus_read_byte_data(client,
1011 temp_reg[i]);
1012
1013 data->stat1 = i2c_smbus_read_byte_data(client,
1014 AMC6821_REG_STAT1);
1015 data->stat2 = i2c_smbus_read_byte_data(client,
1016 AMC6821_REG_STAT2);
1017
1018 data->pwm1 = i2c_smbus_read_byte_data(client,
1019 AMC6821_REG_DCY);
1020 for (i = 0; i < FAN1_IDX_LEN; i++) {
1021 data->fan[i] = i2c_smbus_read_byte_data(
1022 client,
1023 fan_reg_low[i]);
1024 data->fan[i] += i2c_smbus_read_byte_data(
1025 client,
1026 fan_reg_hi[i]) << 8;
1027 }
1028 data->fan1_div = i2c_smbus_read_byte_data(client,
1029 AMC6821_REG_CONF4);
1030 data->fan1_div = data->fan1_div & AMC6821_CONF4_PSPR ? 4 : 2;
1031
1032 data->pwm1_auto_point_pwm[0] = 0;
1033 data->pwm1_auto_point_pwm[2] = 255;
1034 data->pwm1_auto_point_pwm[1] = i2c_smbus_read_byte_data(client,
1035 AMC6821_REG_DCY_LOW_TEMP);
1036
1037 data->temp1_auto_point_temp[0] =
1038 i2c_smbus_read_byte_data(client,
1039 AMC6821_REG_PSV_TEMP);
1040 data->temp2_auto_point_temp[0] =
1041 data->temp1_auto_point_temp[0];
1042 reg = i2c_smbus_read_byte_data(client,
1043 AMC6821_REG_LTEMP_FAN_CTRL);
1044 data->temp1_auto_point_temp[1] = (reg & 0xF8) >> 1;
1045 reg &= 0x07;
1046 reg = 0x20 >> reg;
1047 if (reg > 0)
1048 data->temp1_auto_point_temp[2] =
1049 data->temp1_auto_point_temp[1] +
1050 (data->pwm1_auto_point_pwm[2] -
1051 data->pwm1_auto_point_pwm[1]) / reg;
1052 else
1053 data->temp1_auto_point_temp[2] = 255;
1054
1055 reg = i2c_smbus_read_byte_data(client,
1056 AMC6821_REG_RTEMP_FAN_CTRL);
1057 data->temp2_auto_point_temp[1] = (reg & 0xF8) >> 1;
1058 reg &= 0x07;
1059 reg = 0x20 >> reg;
1060 if (reg > 0)
1061 data->temp2_auto_point_temp[2] =
1062 data->temp2_auto_point_temp[1] +
1063 (data->pwm1_auto_point_pwm[2] -
1064 data->pwm1_auto_point_pwm[1]) / reg;
1065 else
1066 data->temp2_auto_point_temp[2] = 255;
1067
1068 reg = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF1);
1069 reg = (reg >> 5) & 0x3;
1070 switch (reg) {
1071 case 0: /*open loop: software sets pwm1*/
1072 data->pwm1_auto_channels_temp = 0;
1073 data->pwm1_enable = 1;
1074 break;
1075 case 2: /*closed loop: remote T (temp2)*/
1076 data->pwm1_auto_channels_temp = 2;
1077 data->pwm1_enable = 2;
1078 break;
1079 case 3: /*closed loop: local and remote T (temp2)*/
1080 data->pwm1_auto_channels_temp = 3;
1081 data->pwm1_enable = 3;
1082 break;
1083 case 1: /*semi-open loop: software sets rpm, chip controls pwm1,
1084 *currently not implemented
1085 */
1086 data->pwm1_auto_channels_temp = 0;
1087 data->pwm1_enable = 0;
1088 break;
1089 }
1090
1091 data->last_updated = jiffies;
1092 data->valid = 1;
1093 }
1094 mutex_unlock(&data->update_lock);
1095 return data;
1096}
1097
1098
1099static int __init amc6821_init(void)
1100{
1101 return i2c_add_driver(&amc6821_driver);
1102}
1103
1104static void __exit amc6821_exit(void)
1105{
1106 i2c_del_driver(&amc6821_driver);
1107}
1108
1109module_init(amc6821_init);
1110module_exit(amc6821_exit);
1111
1112
1113MODULE_LICENSE("GPL");
1114MODULE_AUTHOR("T. Mertelj <tomaz.mertelj@guest.arnes.si>");
1115MODULE_DESCRIPTION("Texas Instruments amc6821 hwmon driver");
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * amc6821.c - Part of lm_sensors, Linux kernel modules for hardware
4 * monitoring
5 * Copyright (C) 2009 T. Mertelj <tomaz.mertelj@guest.arnes.si>
6 *
7 * Based on max6650.c:
8 * Copyright (C) 2007 Hans J. Koch <hjk@hansjkoch.de>
9 */
10
11#include <linux/kernel.h> /* Needed for KERN_INFO */
12#include <linux/module.h>
13#include <linux/init.h>
14#include <linux/slab.h>
15#include <linux/jiffies.h>
16#include <linux/i2c.h>
17#include <linux/hwmon.h>
18#include <linux/hwmon-sysfs.h>
19#include <linux/err.h>
20#include <linux/mutex.h>
21
22/*
23 * Addresses to scan.
24 */
25
26static const unsigned short normal_i2c[] = {0x18, 0x19, 0x1a, 0x2c, 0x2d, 0x2e,
27 0x4c, 0x4d, 0x4e, I2C_CLIENT_END};
28
29/*
30 * Insmod parameters
31 */
32
33static int pwminv; /*Inverted PWM output. */
34module_param(pwminv, int, 0444);
35
36static int init = 1; /*Power-on initialization.*/
37module_param(init, int, 0444);
38
39enum chips { amc6821 };
40
41#define AMC6821_REG_DEV_ID 0x3D
42#define AMC6821_REG_COMP_ID 0x3E
43#define AMC6821_REG_CONF1 0x00
44#define AMC6821_REG_CONF2 0x01
45#define AMC6821_REG_CONF3 0x3F
46#define AMC6821_REG_CONF4 0x04
47#define AMC6821_REG_STAT1 0x02
48#define AMC6821_REG_STAT2 0x03
49#define AMC6821_REG_TDATA_LOW 0x08
50#define AMC6821_REG_TDATA_HI 0x09
51#define AMC6821_REG_LTEMP_HI 0x0A
52#define AMC6821_REG_RTEMP_HI 0x0B
53#define AMC6821_REG_LTEMP_LIMIT_MIN 0x15
54#define AMC6821_REG_LTEMP_LIMIT_MAX 0x14
55#define AMC6821_REG_RTEMP_LIMIT_MIN 0x19
56#define AMC6821_REG_RTEMP_LIMIT_MAX 0x18
57#define AMC6821_REG_LTEMP_CRIT 0x1B
58#define AMC6821_REG_RTEMP_CRIT 0x1D
59#define AMC6821_REG_PSV_TEMP 0x1C
60#define AMC6821_REG_DCY 0x22
61#define AMC6821_REG_LTEMP_FAN_CTRL 0x24
62#define AMC6821_REG_RTEMP_FAN_CTRL 0x25
63#define AMC6821_REG_DCY_LOW_TEMP 0x21
64
65#define AMC6821_REG_TACH_LLIMITL 0x10
66#define AMC6821_REG_TACH_LLIMITH 0x11
67#define AMC6821_REG_TACH_HLIMITL 0x12
68#define AMC6821_REG_TACH_HLIMITH 0x13
69
70#define AMC6821_CONF1_START 0x01
71#define AMC6821_CONF1_FAN_INT_EN 0x02
72#define AMC6821_CONF1_FANIE 0x04
73#define AMC6821_CONF1_PWMINV 0x08
74#define AMC6821_CONF1_FAN_FAULT_EN 0x10
75#define AMC6821_CONF1_FDRC0 0x20
76#define AMC6821_CONF1_FDRC1 0x40
77#define AMC6821_CONF1_THERMOVIE 0x80
78
79#define AMC6821_CONF2_PWM_EN 0x01
80#define AMC6821_CONF2_TACH_MODE 0x02
81#define AMC6821_CONF2_TACH_EN 0x04
82#define AMC6821_CONF2_RTFIE 0x08
83#define AMC6821_CONF2_LTOIE 0x10
84#define AMC6821_CONF2_RTOIE 0x20
85#define AMC6821_CONF2_PSVIE 0x40
86#define AMC6821_CONF2_RST 0x80
87
88#define AMC6821_CONF3_THERM_FAN_EN 0x80
89#define AMC6821_CONF3_REV_MASK 0x0F
90
91#define AMC6821_CONF4_OVREN 0x10
92#define AMC6821_CONF4_TACH_FAST 0x20
93#define AMC6821_CONF4_PSPR 0x40
94#define AMC6821_CONF4_MODE 0x80
95
96#define AMC6821_STAT1_RPM_ALARM 0x01
97#define AMC6821_STAT1_FANS 0x02
98#define AMC6821_STAT1_RTH 0x04
99#define AMC6821_STAT1_RTL 0x08
100#define AMC6821_STAT1_R_THERM 0x10
101#define AMC6821_STAT1_RTF 0x20
102#define AMC6821_STAT1_LTH 0x40
103#define AMC6821_STAT1_LTL 0x80
104
105#define AMC6821_STAT2_RTC 0x08
106#define AMC6821_STAT2_LTC 0x10
107#define AMC6821_STAT2_LPSV 0x20
108#define AMC6821_STAT2_L_THERM 0x40
109#define AMC6821_STAT2_THERM_IN 0x80
110
111enum {IDX_TEMP1_INPUT = 0, IDX_TEMP1_MIN, IDX_TEMP1_MAX,
112 IDX_TEMP1_CRIT, IDX_TEMP2_INPUT, IDX_TEMP2_MIN,
113 IDX_TEMP2_MAX, IDX_TEMP2_CRIT,
114 TEMP_IDX_LEN, };
115
116static const u8 temp_reg[] = {AMC6821_REG_LTEMP_HI,
117 AMC6821_REG_LTEMP_LIMIT_MIN,
118 AMC6821_REG_LTEMP_LIMIT_MAX,
119 AMC6821_REG_LTEMP_CRIT,
120 AMC6821_REG_RTEMP_HI,
121 AMC6821_REG_RTEMP_LIMIT_MIN,
122 AMC6821_REG_RTEMP_LIMIT_MAX,
123 AMC6821_REG_RTEMP_CRIT, };
124
125enum {IDX_FAN1_INPUT = 0, IDX_FAN1_MIN, IDX_FAN1_MAX,
126 FAN1_IDX_LEN, };
127
128static const u8 fan_reg_low[] = {AMC6821_REG_TDATA_LOW,
129 AMC6821_REG_TACH_LLIMITL,
130 AMC6821_REG_TACH_HLIMITL, };
131
132
133static const u8 fan_reg_hi[] = {AMC6821_REG_TDATA_HI,
134 AMC6821_REG_TACH_LLIMITH,
135 AMC6821_REG_TACH_HLIMITH, };
136
137/*
138 * Client data (each client gets its own)
139 */
140
141struct amc6821_data {
142 struct i2c_client *client;
143 struct mutex update_lock;
144 bool valid; /* false until following fields are valid */
145 unsigned long last_updated; /* in jiffies */
146
147 /* register values */
148 int temp[TEMP_IDX_LEN];
149
150 u16 fan[FAN1_IDX_LEN];
151 u8 fan1_div;
152
153 u8 pwm1;
154 u8 temp1_auto_point_temp[3];
155 u8 temp2_auto_point_temp[3];
156 u8 pwm1_auto_point_pwm[3];
157 u8 pwm1_enable;
158 u8 pwm1_auto_channels_temp;
159
160 u8 stat1;
161 u8 stat2;
162};
163
164static struct amc6821_data *amc6821_update_device(struct device *dev)
165{
166 struct amc6821_data *data = dev_get_drvdata(dev);
167 struct i2c_client *client = data->client;
168 int timeout = HZ;
169 u8 reg;
170 int i;
171
172 mutex_lock(&data->update_lock);
173
174 if (time_after(jiffies, data->last_updated + timeout) ||
175 !data->valid) {
176
177 for (i = 0; i < TEMP_IDX_LEN; i++)
178 data->temp[i] = (int8_t)i2c_smbus_read_byte_data(
179 client, temp_reg[i]);
180
181 data->stat1 = i2c_smbus_read_byte_data(client,
182 AMC6821_REG_STAT1);
183 data->stat2 = i2c_smbus_read_byte_data(client,
184 AMC6821_REG_STAT2);
185
186 data->pwm1 = i2c_smbus_read_byte_data(client,
187 AMC6821_REG_DCY);
188 for (i = 0; i < FAN1_IDX_LEN; i++) {
189 data->fan[i] = i2c_smbus_read_byte_data(
190 client,
191 fan_reg_low[i]);
192 data->fan[i] += i2c_smbus_read_byte_data(
193 client,
194 fan_reg_hi[i]) << 8;
195 }
196 data->fan1_div = i2c_smbus_read_byte_data(client,
197 AMC6821_REG_CONF4);
198 data->fan1_div = data->fan1_div & AMC6821_CONF4_PSPR ? 4 : 2;
199
200 data->pwm1_auto_point_pwm[0] = 0;
201 data->pwm1_auto_point_pwm[2] = 255;
202 data->pwm1_auto_point_pwm[1] = i2c_smbus_read_byte_data(client,
203 AMC6821_REG_DCY_LOW_TEMP);
204
205 data->temp1_auto_point_temp[0] =
206 i2c_smbus_read_byte_data(client,
207 AMC6821_REG_PSV_TEMP);
208 data->temp2_auto_point_temp[0] =
209 data->temp1_auto_point_temp[0];
210 reg = i2c_smbus_read_byte_data(client,
211 AMC6821_REG_LTEMP_FAN_CTRL);
212 data->temp1_auto_point_temp[1] = (reg & 0xF8) >> 1;
213 reg &= 0x07;
214 reg = 0x20 >> reg;
215 if (reg > 0)
216 data->temp1_auto_point_temp[2] =
217 data->temp1_auto_point_temp[1] +
218 (data->pwm1_auto_point_pwm[2] -
219 data->pwm1_auto_point_pwm[1]) / reg;
220 else
221 data->temp1_auto_point_temp[2] = 255;
222
223 reg = i2c_smbus_read_byte_data(client,
224 AMC6821_REG_RTEMP_FAN_CTRL);
225 data->temp2_auto_point_temp[1] = (reg & 0xF8) >> 1;
226 reg &= 0x07;
227 reg = 0x20 >> reg;
228 if (reg > 0)
229 data->temp2_auto_point_temp[2] =
230 data->temp2_auto_point_temp[1] +
231 (data->pwm1_auto_point_pwm[2] -
232 data->pwm1_auto_point_pwm[1]) / reg;
233 else
234 data->temp2_auto_point_temp[2] = 255;
235
236 reg = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF1);
237 reg = (reg >> 5) & 0x3;
238 switch (reg) {
239 case 0: /*open loop: software sets pwm1*/
240 data->pwm1_auto_channels_temp = 0;
241 data->pwm1_enable = 1;
242 break;
243 case 2: /*closed loop: remote T (temp2)*/
244 data->pwm1_auto_channels_temp = 2;
245 data->pwm1_enable = 2;
246 break;
247 case 3: /*closed loop: local and remote T (temp2)*/
248 data->pwm1_auto_channels_temp = 3;
249 data->pwm1_enable = 3;
250 break;
251 case 1: /*
252 * semi-open loop: software sets rpm, chip controls
253 * pwm1, currently not implemented
254 */
255 data->pwm1_auto_channels_temp = 0;
256 data->pwm1_enable = 0;
257 break;
258 }
259
260 data->last_updated = jiffies;
261 data->valid = true;
262 }
263 mutex_unlock(&data->update_lock);
264 return data;
265}
266
267static ssize_t temp_show(struct device *dev, struct device_attribute *devattr,
268 char *buf)
269{
270 struct amc6821_data *data = amc6821_update_device(dev);
271 int ix = to_sensor_dev_attr(devattr)->index;
272
273 return sprintf(buf, "%d\n", data->temp[ix] * 1000);
274}
275
276static ssize_t temp_store(struct device *dev, struct device_attribute *attr,
277 const char *buf, size_t count)
278{
279 struct amc6821_data *data = dev_get_drvdata(dev);
280 struct i2c_client *client = data->client;
281 int ix = to_sensor_dev_attr(attr)->index;
282 long val;
283
284 int ret = kstrtol(buf, 10, &val);
285 if (ret)
286 return ret;
287 val = clamp_val(val / 1000, -128, 127);
288
289 mutex_lock(&data->update_lock);
290 data->temp[ix] = val;
291 if (i2c_smbus_write_byte_data(client, temp_reg[ix], data->temp[ix])) {
292 dev_err(&client->dev, "Register write error, aborting.\n");
293 count = -EIO;
294 }
295 mutex_unlock(&data->update_lock);
296 return count;
297}
298
299static ssize_t temp_alarm_show(struct device *dev,
300 struct device_attribute *devattr, char *buf)
301{
302 struct amc6821_data *data = amc6821_update_device(dev);
303 int ix = to_sensor_dev_attr(devattr)->index;
304 u8 flag;
305
306 switch (ix) {
307 case IDX_TEMP1_MIN:
308 flag = data->stat1 & AMC6821_STAT1_LTL;
309 break;
310 case IDX_TEMP1_MAX:
311 flag = data->stat1 & AMC6821_STAT1_LTH;
312 break;
313 case IDX_TEMP1_CRIT:
314 flag = data->stat2 & AMC6821_STAT2_LTC;
315 break;
316 case IDX_TEMP2_MIN:
317 flag = data->stat1 & AMC6821_STAT1_RTL;
318 break;
319 case IDX_TEMP2_MAX:
320 flag = data->stat1 & AMC6821_STAT1_RTH;
321 break;
322 case IDX_TEMP2_CRIT:
323 flag = data->stat2 & AMC6821_STAT2_RTC;
324 break;
325 default:
326 dev_dbg(dev, "Unknown attr->index (%d).\n", ix);
327 return -EINVAL;
328 }
329 if (flag)
330 return sprintf(buf, "1");
331 else
332 return sprintf(buf, "0");
333}
334
335static ssize_t temp2_fault_show(struct device *dev,
336 struct device_attribute *devattr, char *buf)
337{
338 struct amc6821_data *data = amc6821_update_device(dev);
339 if (data->stat1 & AMC6821_STAT1_RTF)
340 return sprintf(buf, "1");
341 else
342 return sprintf(buf, "0");
343}
344
345static ssize_t pwm1_show(struct device *dev, struct device_attribute *devattr,
346 char *buf)
347{
348 struct amc6821_data *data = amc6821_update_device(dev);
349 return sprintf(buf, "%d\n", data->pwm1);
350}
351
352static ssize_t pwm1_store(struct device *dev,
353 struct device_attribute *devattr, const char *buf,
354 size_t count)
355{
356 struct amc6821_data *data = dev_get_drvdata(dev);
357 struct i2c_client *client = data->client;
358 long val;
359 int ret = kstrtol(buf, 10, &val);
360 if (ret)
361 return ret;
362
363 mutex_lock(&data->update_lock);
364 data->pwm1 = clamp_val(val , 0, 255);
365 i2c_smbus_write_byte_data(client, AMC6821_REG_DCY, data->pwm1);
366 mutex_unlock(&data->update_lock);
367 return count;
368}
369
370static ssize_t pwm1_enable_show(struct device *dev,
371 struct device_attribute *devattr, char *buf)
372{
373 struct amc6821_data *data = amc6821_update_device(dev);
374 return sprintf(buf, "%d\n", data->pwm1_enable);
375}
376
377static ssize_t pwm1_enable_store(struct device *dev,
378 struct device_attribute *attr,
379 const char *buf, size_t count)
380{
381 struct amc6821_data *data = dev_get_drvdata(dev);
382 struct i2c_client *client = data->client;
383 long val;
384 int config = kstrtol(buf, 10, &val);
385 if (config)
386 return config;
387
388 mutex_lock(&data->update_lock);
389 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF1);
390 if (config < 0) {
391 dev_err(&client->dev,
392 "Error reading configuration register, aborting.\n");
393 count = config;
394 goto unlock;
395 }
396
397 switch (val) {
398 case 1:
399 config &= ~AMC6821_CONF1_FDRC0;
400 config &= ~AMC6821_CONF1_FDRC1;
401 break;
402 case 2:
403 config &= ~AMC6821_CONF1_FDRC0;
404 config |= AMC6821_CONF1_FDRC1;
405 break;
406 case 3:
407 config |= AMC6821_CONF1_FDRC0;
408 config |= AMC6821_CONF1_FDRC1;
409 break;
410 default:
411 count = -EINVAL;
412 goto unlock;
413 }
414 if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF1, config)) {
415 dev_err(&client->dev,
416 "Configuration register write error, aborting.\n");
417 count = -EIO;
418 }
419unlock:
420 mutex_unlock(&data->update_lock);
421 return count;
422}
423
424static ssize_t pwm1_auto_channels_temp_show(struct device *dev,
425 struct device_attribute *devattr,
426 char *buf)
427{
428 struct amc6821_data *data = amc6821_update_device(dev);
429 return sprintf(buf, "%d\n", data->pwm1_auto_channels_temp);
430}
431
432static ssize_t temp_auto_point_temp_show(struct device *dev,
433 struct device_attribute *devattr,
434 char *buf)
435{
436 int ix = to_sensor_dev_attr_2(devattr)->index;
437 int nr = to_sensor_dev_attr_2(devattr)->nr;
438 struct amc6821_data *data = amc6821_update_device(dev);
439 switch (nr) {
440 case 1:
441 return sprintf(buf, "%d\n",
442 data->temp1_auto_point_temp[ix] * 1000);
443 case 2:
444 return sprintf(buf, "%d\n",
445 data->temp2_auto_point_temp[ix] * 1000);
446 default:
447 dev_dbg(dev, "Unknown attr->nr (%d).\n", nr);
448 return -EINVAL;
449 }
450}
451
452static ssize_t pwm1_auto_point_pwm_show(struct device *dev,
453 struct device_attribute *devattr,
454 char *buf)
455{
456 int ix = to_sensor_dev_attr(devattr)->index;
457 struct amc6821_data *data = amc6821_update_device(dev);
458 return sprintf(buf, "%d\n", data->pwm1_auto_point_pwm[ix]);
459}
460
461static inline ssize_t set_slope_register(struct i2c_client *client,
462 u8 reg,
463 u8 dpwm,
464 u8 *ptemp)
465{
466 int dt;
467 u8 tmp;
468
469 dt = ptemp[2]-ptemp[1];
470 for (tmp = 4; tmp > 0; tmp--) {
471 if (dt * (0x20 >> tmp) >= dpwm)
472 break;
473 }
474 tmp |= (ptemp[1] & 0x7C) << 1;
475 if (i2c_smbus_write_byte_data(client,
476 reg, tmp)) {
477 dev_err(&client->dev, "Register write error, aborting.\n");
478 return -EIO;
479 }
480 return 0;
481}
482
483static ssize_t temp_auto_point_temp_store(struct device *dev,
484 struct device_attribute *attr,
485 const char *buf, size_t count)
486{
487 struct amc6821_data *data = amc6821_update_device(dev);
488 struct i2c_client *client = data->client;
489 int ix = to_sensor_dev_attr_2(attr)->index;
490 int nr = to_sensor_dev_attr_2(attr)->nr;
491 u8 *ptemp;
492 u8 reg;
493 int dpwm;
494 long val;
495 int ret = kstrtol(buf, 10, &val);
496 if (ret)
497 return ret;
498
499 switch (nr) {
500 case 1:
501 ptemp = data->temp1_auto_point_temp;
502 reg = AMC6821_REG_LTEMP_FAN_CTRL;
503 break;
504 case 2:
505 ptemp = data->temp2_auto_point_temp;
506 reg = AMC6821_REG_RTEMP_FAN_CTRL;
507 break;
508 default:
509 dev_dbg(dev, "Unknown attr->nr (%d).\n", nr);
510 return -EINVAL;
511 }
512
513 mutex_lock(&data->update_lock);
514 data->valid = false;
515
516 switch (ix) {
517 case 0:
518 ptemp[0] = clamp_val(val / 1000, 0,
519 data->temp1_auto_point_temp[1]);
520 ptemp[0] = clamp_val(ptemp[0], 0,
521 data->temp2_auto_point_temp[1]);
522 ptemp[0] = clamp_val(ptemp[0], 0, 63);
523 if (i2c_smbus_write_byte_data(
524 client,
525 AMC6821_REG_PSV_TEMP,
526 ptemp[0])) {
527 dev_err(&client->dev,
528 "Register write error, aborting.\n");
529 count = -EIO;
530 }
531 goto EXIT;
532 case 1:
533 ptemp[1] = clamp_val(val / 1000, (ptemp[0] & 0x7C) + 4, 124);
534 ptemp[1] &= 0x7C;
535 ptemp[2] = clamp_val(ptemp[2], ptemp[1] + 1, 255);
536 break;
537 case 2:
538 ptemp[2] = clamp_val(val / 1000, ptemp[1]+1, 255);
539 break;
540 default:
541 dev_dbg(dev, "Unknown attr->index (%d).\n", ix);
542 count = -EINVAL;
543 goto EXIT;
544 }
545 dpwm = data->pwm1_auto_point_pwm[2] - data->pwm1_auto_point_pwm[1];
546 if (set_slope_register(client, reg, dpwm, ptemp))
547 count = -EIO;
548
549EXIT:
550 mutex_unlock(&data->update_lock);
551 return count;
552}
553
554static ssize_t pwm1_auto_point_pwm_store(struct device *dev,
555 struct device_attribute *attr,
556 const char *buf, size_t count)
557{
558 struct amc6821_data *data = dev_get_drvdata(dev);
559 struct i2c_client *client = data->client;
560 int dpwm;
561 long val;
562 int ret = kstrtol(buf, 10, &val);
563 if (ret)
564 return ret;
565
566 mutex_lock(&data->update_lock);
567 data->pwm1_auto_point_pwm[1] = clamp_val(val, 0, 254);
568 if (i2c_smbus_write_byte_data(client, AMC6821_REG_DCY_LOW_TEMP,
569 data->pwm1_auto_point_pwm[1])) {
570 dev_err(&client->dev, "Register write error, aborting.\n");
571 count = -EIO;
572 goto EXIT;
573 }
574 dpwm = data->pwm1_auto_point_pwm[2] - data->pwm1_auto_point_pwm[1];
575 if (set_slope_register(client, AMC6821_REG_LTEMP_FAN_CTRL, dpwm,
576 data->temp1_auto_point_temp)) {
577 count = -EIO;
578 goto EXIT;
579 }
580 if (set_slope_register(client, AMC6821_REG_RTEMP_FAN_CTRL, dpwm,
581 data->temp2_auto_point_temp)) {
582 count = -EIO;
583 goto EXIT;
584 }
585
586EXIT:
587 data->valid = false;
588 mutex_unlock(&data->update_lock);
589 return count;
590}
591
592static ssize_t fan_show(struct device *dev, struct device_attribute *devattr,
593 char *buf)
594{
595 struct amc6821_data *data = amc6821_update_device(dev);
596 int ix = to_sensor_dev_attr(devattr)->index;
597 if (0 == data->fan[ix])
598 return sprintf(buf, "0");
599 return sprintf(buf, "%d\n", (int)(6000000 / data->fan[ix]));
600}
601
602static ssize_t fan1_fault_show(struct device *dev,
603 struct device_attribute *devattr, char *buf)
604{
605 struct amc6821_data *data = amc6821_update_device(dev);
606 if (data->stat1 & AMC6821_STAT1_FANS)
607 return sprintf(buf, "1");
608 else
609 return sprintf(buf, "0");
610}
611
612static ssize_t fan_store(struct device *dev, struct device_attribute *attr,
613 const char *buf, size_t count)
614{
615 struct amc6821_data *data = dev_get_drvdata(dev);
616 struct i2c_client *client = data->client;
617 long val;
618 int ix = to_sensor_dev_attr(attr)->index;
619 int ret = kstrtol(buf, 10, &val);
620 if (ret)
621 return ret;
622 val = 1 > val ? 0xFFFF : 6000000/val;
623
624 mutex_lock(&data->update_lock);
625 data->fan[ix] = (u16) clamp_val(val, 1, 0xFFFF);
626 if (i2c_smbus_write_byte_data(client, fan_reg_low[ix],
627 data->fan[ix] & 0xFF)) {
628 dev_err(&client->dev, "Register write error, aborting.\n");
629 count = -EIO;
630 goto EXIT;
631 }
632 if (i2c_smbus_write_byte_data(client,
633 fan_reg_hi[ix], data->fan[ix] >> 8)) {
634 dev_err(&client->dev, "Register write error, aborting.\n");
635 count = -EIO;
636 }
637EXIT:
638 mutex_unlock(&data->update_lock);
639 return count;
640}
641
642static ssize_t fan1_div_show(struct device *dev,
643 struct device_attribute *devattr, char *buf)
644{
645 struct amc6821_data *data = amc6821_update_device(dev);
646 return sprintf(buf, "%d\n", data->fan1_div);
647}
648
649static ssize_t fan1_div_store(struct device *dev,
650 struct device_attribute *attr, const char *buf,
651 size_t count)
652{
653 struct amc6821_data *data = dev_get_drvdata(dev);
654 struct i2c_client *client = data->client;
655 long val;
656 int config = kstrtol(buf, 10, &val);
657 if (config)
658 return config;
659
660 mutex_lock(&data->update_lock);
661 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF4);
662 if (config < 0) {
663 dev_err(&client->dev,
664 "Error reading configuration register, aborting.\n");
665 count = config;
666 goto EXIT;
667 }
668 switch (val) {
669 case 2:
670 config &= ~AMC6821_CONF4_PSPR;
671 data->fan1_div = 2;
672 break;
673 case 4:
674 config |= AMC6821_CONF4_PSPR;
675 data->fan1_div = 4;
676 break;
677 default:
678 count = -EINVAL;
679 goto EXIT;
680 }
681 if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF4, config)) {
682 dev_err(&client->dev,
683 "Configuration register write error, aborting.\n");
684 count = -EIO;
685 }
686EXIT:
687 mutex_unlock(&data->update_lock);
688 return count;
689}
690
691static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, IDX_TEMP1_INPUT);
692static SENSOR_DEVICE_ATTR_RW(temp1_min, temp, IDX_TEMP1_MIN);
693static SENSOR_DEVICE_ATTR_RW(temp1_max, temp, IDX_TEMP1_MAX);
694static SENSOR_DEVICE_ATTR_RW(temp1_crit, temp, IDX_TEMP1_CRIT);
695static SENSOR_DEVICE_ATTR_RO(temp1_min_alarm, temp_alarm, IDX_TEMP1_MIN);
696static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, temp_alarm, IDX_TEMP1_MAX);
697static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, temp_alarm, IDX_TEMP1_CRIT);
698static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, IDX_TEMP2_INPUT);
699static SENSOR_DEVICE_ATTR_RW(temp2_min, temp, IDX_TEMP2_MIN);
700static SENSOR_DEVICE_ATTR_RW(temp2_max, temp, IDX_TEMP2_MAX);
701static SENSOR_DEVICE_ATTR_RW(temp2_crit, temp, IDX_TEMP2_CRIT);
702static SENSOR_DEVICE_ATTR_RO(temp2_fault, temp2_fault, 0);
703static SENSOR_DEVICE_ATTR_RO(temp2_min_alarm, temp_alarm, IDX_TEMP2_MIN);
704static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, temp_alarm, IDX_TEMP2_MAX);
705static SENSOR_DEVICE_ATTR_RO(temp2_crit_alarm, temp_alarm, IDX_TEMP2_CRIT);
706static SENSOR_DEVICE_ATTR_RO(fan1_input, fan, IDX_FAN1_INPUT);
707static SENSOR_DEVICE_ATTR_RW(fan1_min, fan, IDX_FAN1_MIN);
708static SENSOR_DEVICE_ATTR_RW(fan1_max, fan, IDX_FAN1_MAX);
709static SENSOR_DEVICE_ATTR_RO(fan1_fault, fan1_fault, 0);
710static SENSOR_DEVICE_ATTR_RW(fan1_div, fan1_div, 0);
711
712static SENSOR_DEVICE_ATTR_RW(pwm1, pwm1, 0);
713static SENSOR_DEVICE_ATTR_RW(pwm1_enable, pwm1_enable, 0);
714static SENSOR_DEVICE_ATTR_RO(pwm1_auto_point1_pwm, pwm1_auto_point_pwm, 0);
715static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point2_pwm, pwm1_auto_point_pwm, 1);
716static SENSOR_DEVICE_ATTR_RO(pwm1_auto_point3_pwm, pwm1_auto_point_pwm, 2);
717static SENSOR_DEVICE_ATTR_RO(pwm1_auto_channels_temp, pwm1_auto_channels_temp,
718 0);
719static SENSOR_DEVICE_ATTR_2_RO(temp1_auto_point1_temp, temp_auto_point_temp,
720 1, 0);
721static SENSOR_DEVICE_ATTR_2_RW(temp1_auto_point2_temp, temp_auto_point_temp,
722 1, 1);
723static SENSOR_DEVICE_ATTR_2_RW(temp1_auto_point3_temp, temp_auto_point_temp,
724 1, 2);
725
726static SENSOR_DEVICE_ATTR_2_RW(temp2_auto_point1_temp, temp_auto_point_temp,
727 2, 0);
728static SENSOR_DEVICE_ATTR_2_RW(temp2_auto_point2_temp, temp_auto_point_temp,
729 2, 1);
730static SENSOR_DEVICE_ATTR_2_RW(temp2_auto_point3_temp, temp_auto_point_temp,
731 2, 2);
732
733static struct attribute *amc6821_attrs[] = {
734 &sensor_dev_attr_temp1_input.dev_attr.attr,
735 &sensor_dev_attr_temp1_min.dev_attr.attr,
736 &sensor_dev_attr_temp1_max.dev_attr.attr,
737 &sensor_dev_attr_temp1_crit.dev_attr.attr,
738 &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
739 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
740 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
741 &sensor_dev_attr_temp2_input.dev_attr.attr,
742 &sensor_dev_attr_temp2_min.dev_attr.attr,
743 &sensor_dev_attr_temp2_max.dev_attr.attr,
744 &sensor_dev_attr_temp2_crit.dev_attr.attr,
745 &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
746 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
747 &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
748 &sensor_dev_attr_temp2_fault.dev_attr.attr,
749 &sensor_dev_attr_fan1_input.dev_attr.attr,
750 &sensor_dev_attr_fan1_min.dev_attr.attr,
751 &sensor_dev_attr_fan1_max.dev_attr.attr,
752 &sensor_dev_attr_fan1_fault.dev_attr.attr,
753 &sensor_dev_attr_fan1_div.dev_attr.attr,
754 &sensor_dev_attr_pwm1.dev_attr.attr,
755 &sensor_dev_attr_pwm1_enable.dev_attr.attr,
756 &sensor_dev_attr_pwm1_auto_channels_temp.dev_attr.attr,
757 &sensor_dev_attr_pwm1_auto_point1_pwm.dev_attr.attr,
758 &sensor_dev_attr_pwm1_auto_point2_pwm.dev_attr.attr,
759 &sensor_dev_attr_pwm1_auto_point3_pwm.dev_attr.attr,
760 &sensor_dev_attr_temp1_auto_point1_temp.dev_attr.attr,
761 &sensor_dev_attr_temp1_auto_point2_temp.dev_attr.attr,
762 &sensor_dev_attr_temp1_auto_point3_temp.dev_attr.attr,
763 &sensor_dev_attr_temp2_auto_point1_temp.dev_attr.attr,
764 &sensor_dev_attr_temp2_auto_point2_temp.dev_attr.attr,
765 &sensor_dev_attr_temp2_auto_point3_temp.dev_attr.attr,
766 NULL
767};
768
769ATTRIBUTE_GROUPS(amc6821);
770
771/* Return 0 if detection is successful, -ENODEV otherwise */
772static int amc6821_detect(
773 struct i2c_client *client,
774 struct i2c_board_info *info)
775{
776 struct i2c_adapter *adapter = client->adapter;
777 int address = client->addr;
778 int dev_id, comp_id;
779
780 dev_dbg(&adapter->dev, "amc6821_detect called.\n");
781
782 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
783 dev_dbg(&adapter->dev,
784 "amc6821: I2C bus doesn't support byte mode, "
785 "skipping.\n");
786 return -ENODEV;
787 }
788
789 dev_id = i2c_smbus_read_byte_data(client, AMC6821_REG_DEV_ID);
790 comp_id = i2c_smbus_read_byte_data(client, AMC6821_REG_COMP_ID);
791 if (dev_id != 0x21 || comp_id != 0x49) {
792 dev_dbg(&adapter->dev,
793 "amc6821: detection failed at 0x%02x.\n",
794 address);
795 return -ENODEV;
796 }
797
798 /*
799 * Bit 7 of the address register is ignored, so we can check the
800 * ID registers again
801 */
802 dev_id = i2c_smbus_read_byte_data(client, 0x80 | AMC6821_REG_DEV_ID);
803 comp_id = i2c_smbus_read_byte_data(client, 0x80 | AMC6821_REG_COMP_ID);
804 if (dev_id != 0x21 || comp_id != 0x49) {
805 dev_dbg(&adapter->dev,
806 "amc6821: detection failed at 0x%02x.\n",
807 address);
808 return -ENODEV;
809 }
810
811 dev_info(&adapter->dev, "amc6821: chip found at 0x%02x.\n", address);
812 strscpy(info->type, "amc6821", I2C_NAME_SIZE);
813
814 return 0;
815}
816
817static int amc6821_init_client(struct i2c_client *client)
818{
819 int config;
820 int err = -EIO;
821
822 if (init) {
823 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF4);
824
825 if (config < 0) {
826 dev_err(&client->dev,
827 "Error reading configuration register, aborting.\n");
828 return err;
829 }
830
831 config |= AMC6821_CONF4_MODE;
832
833 if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF4,
834 config)) {
835 dev_err(&client->dev,
836 "Configuration register write error, aborting.\n");
837 return err;
838 }
839
840 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF3);
841
842 if (config < 0) {
843 dev_err(&client->dev,
844 "Error reading configuration register, aborting.\n");
845 return err;
846 }
847
848 dev_info(&client->dev, "Revision %d\n", config & 0x0f);
849
850 config &= ~AMC6821_CONF3_THERM_FAN_EN;
851
852 if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF3,
853 config)) {
854 dev_err(&client->dev,
855 "Configuration register write error, aborting.\n");
856 return err;
857 }
858
859 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF2);
860
861 if (config < 0) {
862 dev_err(&client->dev,
863 "Error reading configuration register, aborting.\n");
864 return err;
865 }
866
867 config &= ~AMC6821_CONF2_RTFIE;
868 config &= ~AMC6821_CONF2_LTOIE;
869 config &= ~AMC6821_CONF2_RTOIE;
870 if (i2c_smbus_write_byte_data(client,
871 AMC6821_REG_CONF2, config)) {
872 dev_err(&client->dev,
873 "Configuration register write error, aborting.\n");
874 return err;
875 }
876
877 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF1);
878
879 if (config < 0) {
880 dev_err(&client->dev,
881 "Error reading configuration register, aborting.\n");
882 return err;
883 }
884
885 config &= ~AMC6821_CONF1_THERMOVIE;
886 config &= ~AMC6821_CONF1_FANIE;
887 config |= AMC6821_CONF1_START;
888 if (pwminv)
889 config |= AMC6821_CONF1_PWMINV;
890 else
891 config &= ~AMC6821_CONF1_PWMINV;
892
893 if (i2c_smbus_write_byte_data(
894 client, AMC6821_REG_CONF1, config)) {
895 dev_err(&client->dev,
896 "Configuration register write error, aborting.\n");
897 return err;
898 }
899 }
900 return 0;
901}
902
903static int amc6821_probe(struct i2c_client *client)
904{
905 struct device *dev = &client->dev;
906 struct amc6821_data *data;
907 struct device *hwmon_dev;
908 int err;
909
910 data = devm_kzalloc(dev, sizeof(struct amc6821_data), GFP_KERNEL);
911 if (!data)
912 return -ENOMEM;
913
914 data->client = client;
915 mutex_init(&data->update_lock);
916
917 /*
918 * Initialize the amc6821 chip
919 */
920 err = amc6821_init_client(client);
921 if (err)
922 return err;
923
924 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
925 data,
926 amc6821_groups);
927 return PTR_ERR_OR_ZERO(hwmon_dev);
928}
929
930static const struct i2c_device_id amc6821_id[] = {
931 { "amc6821", amc6821 },
932 { }
933};
934
935MODULE_DEVICE_TABLE(i2c, amc6821_id);
936
937static struct i2c_driver amc6821_driver = {
938 .class = I2C_CLASS_HWMON,
939 .driver = {
940 .name = "amc6821",
941 },
942 .probe_new = amc6821_probe,
943 .id_table = amc6821_id,
944 .detect = amc6821_detect,
945 .address_list = normal_i2c,
946};
947
948module_i2c_driver(amc6821_driver);
949
950MODULE_LICENSE("GPL");
951MODULE_AUTHOR("T. Mertelj <tomaz.mertelj@guest.arnes.si>");
952MODULE_DESCRIPTION("Texas Instruments amc6821 hwmon driver");