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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#include <linux/kernel.h> /* Needed for KERN_INFO */
25#include <linux/module.h>
26#include <linux/init.h>
27#include <linux/slab.h>
28#include <linux/jiffies.h>
29#include <linux/i2c.h>
30#include <linux/hwmon.h>
31#include <linux/hwmon-sysfs.h>
32#include <linux/err.h>
33#include <linux/mutex.h>
34
35/*
36 * Addresses to scan.
37 */
38
39static const unsigned short normal_i2c[] = {0x18, 0x19, 0x1a, 0x2c, 0x2d, 0x2e,
40 0x4c, 0x4d, 0x4e, I2C_CLIENT_END};
41
42/*
43 * Insmod parameters
44 */
45
46static int pwminv; /*Inverted PWM output. */
47module_param(pwminv, int, S_IRUGO);
48
49static int init = 1; /*Power-on initialization.*/
50module_param(init, int, S_IRUGO);
51
52enum chips { amc6821 };
53
54#define AMC6821_REG_DEV_ID 0x3D
55#define AMC6821_REG_COMP_ID 0x3E
56#define AMC6821_REG_CONF1 0x00
57#define AMC6821_REG_CONF2 0x01
58#define AMC6821_REG_CONF3 0x3F
59#define AMC6821_REG_CONF4 0x04
60#define AMC6821_REG_STAT1 0x02
61#define AMC6821_REG_STAT2 0x03
62#define AMC6821_REG_TDATA_LOW 0x08
63#define AMC6821_REG_TDATA_HI 0x09
64#define AMC6821_REG_LTEMP_HI 0x0A
65#define AMC6821_REG_RTEMP_HI 0x0B
66#define AMC6821_REG_LTEMP_LIMIT_MIN 0x15
67#define AMC6821_REG_LTEMP_LIMIT_MAX 0x14
68#define AMC6821_REG_RTEMP_LIMIT_MIN 0x19
69#define AMC6821_REG_RTEMP_LIMIT_MAX 0x18
70#define AMC6821_REG_LTEMP_CRIT 0x1B
71#define AMC6821_REG_RTEMP_CRIT 0x1D
72#define AMC6821_REG_PSV_TEMP 0x1C
73#define AMC6821_REG_DCY 0x22
74#define AMC6821_REG_LTEMP_FAN_CTRL 0x24
75#define AMC6821_REG_RTEMP_FAN_CTRL 0x25
76#define AMC6821_REG_DCY_LOW_TEMP 0x21
77
78#define AMC6821_REG_TACH_LLIMITL 0x10
79#define AMC6821_REG_TACH_LLIMITH 0x11
80#define AMC6821_REG_TACH_HLIMITL 0x12
81#define AMC6821_REG_TACH_HLIMITH 0x13
82
83#define AMC6821_CONF1_START 0x01
84#define AMC6821_CONF1_FAN_INT_EN 0x02
85#define AMC6821_CONF1_FANIE 0x04
86#define AMC6821_CONF1_PWMINV 0x08
87#define AMC6821_CONF1_FAN_FAULT_EN 0x10
88#define AMC6821_CONF1_FDRC0 0x20
89#define AMC6821_CONF1_FDRC1 0x40
90#define AMC6821_CONF1_THERMOVIE 0x80
91
92#define AMC6821_CONF2_PWM_EN 0x01
93#define AMC6821_CONF2_TACH_MODE 0x02
94#define AMC6821_CONF2_TACH_EN 0x04
95#define AMC6821_CONF2_RTFIE 0x08
96#define AMC6821_CONF2_LTOIE 0x10
97#define AMC6821_CONF2_RTOIE 0x20
98#define AMC6821_CONF2_PSVIE 0x40
99#define AMC6821_CONF2_RST 0x80
100
101#define AMC6821_CONF3_THERM_FAN_EN 0x80
102#define AMC6821_CONF3_REV_MASK 0x0F
103
104#define AMC6821_CONF4_OVREN 0x10
105#define AMC6821_CONF4_TACH_FAST 0x20
106#define AMC6821_CONF4_PSPR 0x40
107#define AMC6821_CONF4_MODE 0x80
108
109#define AMC6821_STAT1_RPM_ALARM 0x01
110#define AMC6821_STAT1_FANS 0x02
111#define AMC6821_STAT1_RTH 0x04
112#define AMC6821_STAT1_RTL 0x08
113#define AMC6821_STAT1_R_THERM 0x10
114#define AMC6821_STAT1_RTF 0x20
115#define AMC6821_STAT1_LTH 0x40
116#define AMC6821_STAT1_LTL 0x80
117
118#define AMC6821_STAT2_RTC 0x08
119#define AMC6821_STAT2_LTC 0x10
120#define AMC6821_STAT2_LPSV 0x20
121#define AMC6821_STAT2_L_THERM 0x40
122#define AMC6821_STAT2_THERM_IN 0x80
123
124enum {IDX_TEMP1_INPUT = 0, IDX_TEMP1_MIN, IDX_TEMP1_MAX,
125 IDX_TEMP1_CRIT, IDX_TEMP2_INPUT, IDX_TEMP2_MIN,
126 IDX_TEMP2_MAX, IDX_TEMP2_CRIT,
127 TEMP_IDX_LEN, };
128
129static const u8 temp_reg[] = {AMC6821_REG_LTEMP_HI,
130 AMC6821_REG_LTEMP_LIMIT_MIN,
131 AMC6821_REG_LTEMP_LIMIT_MAX,
132 AMC6821_REG_LTEMP_CRIT,
133 AMC6821_REG_RTEMP_HI,
134 AMC6821_REG_RTEMP_LIMIT_MIN,
135 AMC6821_REG_RTEMP_LIMIT_MAX,
136 AMC6821_REG_RTEMP_CRIT, };
137
138enum {IDX_FAN1_INPUT = 0, IDX_FAN1_MIN, IDX_FAN1_MAX,
139 FAN1_IDX_LEN, };
140
141static const u8 fan_reg_low[] = {AMC6821_REG_TDATA_LOW,
142 AMC6821_REG_TACH_LLIMITL,
143 AMC6821_REG_TACH_HLIMITL, };
144
145
146static const u8 fan_reg_hi[] = {AMC6821_REG_TDATA_HI,
147 AMC6821_REG_TACH_LLIMITH,
148 AMC6821_REG_TACH_HLIMITH, };
149
150/*
151 * Client data (each client gets its own)
152 */
153
154struct amc6821_data {
155 struct i2c_client *client;
156 struct mutex update_lock;
157 char valid; /* zero until following fields are valid */
158 unsigned long last_updated; /* in jiffies */
159
160 /* register values */
161 int temp[TEMP_IDX_LEN];
162
163 u16 fan[FAN1_IDX_LEN];
164 u8 fan1_div;
165
166 u8 pwm1;
167 u8 temp1_auto_point_temp[3];
168 u8 temp2_auto_point_temp[3];
169 u8 pwm1_auto_point_pwm[3];
170 u8 pwm1_enable;
171 u8 pwm1_auto_channels_temp;
172
173 u8 stat1;
174 u8 stat2;
175};
176
177static struct amc6821_data *amc6821_update_device(struct device *dev)
178{
179 struct amc6821_data *data = dev_get_drvdata(dev);
180 struct i2c_client *client = data->client;
181 int timeout = HZ;
182 u8 reg;
183 int i;
184
185 mutex_lock(&data->update_lock);
186
187 if (time_after(jiffies, data->last_updated + timeout) ||
188 !data->valid) {
189
190 for (i = 0; i < TEMP_IDX_LEN; i++)
191 data->temp[i] = (int8_t)i2c_smbus_read_byte_data(
192 client, temp_reg[i]);
193
194 data->stat1 = i2c_smbus_read_byte_data(client,
195 AMC6821_REG_STAT1);
196 data->stat2 = i2c_smbus_read_byte_data(client,
197 AMC6821_REG_STAT2);
198
199 data->pwm1 = i2c_smbus_read_byte_data(client,
200 AMC6821_REG_DCY);
201 for (i = 0; i < FAN1_IDX_LEN; i++) {
202 data->fan[i] = i2c_smbus_read_byte_data(
203 client,
204 fan_reg_low[i]);
205 data->fan[i] += i2c_smbus_read_byte_data(
206 client,
207 fan_reg_hi[i]) << 8;
208 }
209 data->fan1_div = i2c_smbus_read_byte_data(client,
210 AMC6821_REG_CONF4);
211 data->fan1_div = data->fan1_div & AMC6821_CONF4_PSPR ? 4 : 2;
212
213 data->pwm1_auto_point_pwm[0] = 0;
214 data->pwm1_auto_point_pwm[2] = 255;
215 data->pwm1_auto_point_pwm[1] = i2c_smbus_read_byte_data(client,
216 AMC6821_REG_DCY_LOW_TEMP);
217
218 data->temp1_auto_point_temp[0] =
219 i2c_smbus_read_byte_data(client,
220 AMC6821_REG_PSV_TEMP);
221 data->temp2_auto_point_temp[0] =
222 data->temp1_auto_point_temp[0];
223 reg = i2c_smbus_read_byte_data(client,
224 AMC6821_REG_LTEMP_FAN_CTRL);
225 data->temp1_auto_point_temp[1] = (reg & 0xF8) >> 1;
226 reg &= 0x07;
227 reg = 0x20 >> reg;
228 if (reg > 0)
229 data->temp1_auto_point_temp[2] =
230 data->temp1_auto_point_temp[1] +
231 (data->pwm1_auto_point_pwm[2] -
232 data->pwm1_auto_point_pwm[1]) / reg;
233 else
234 data->temp1_auto_point_temp[2] = 255;
235
236 reg = i2c_smbus_read_byte_data(client,
237 AMC6821_REG_RTEMP_FAN_CTRL);
238 data->temp2_auto_point_temp[1] = (reg & 0xF8) >> 1;
239 reg &= 0x07;
240 reg = 0x20 >> reg;
241 if (reg > 0)
242 data->temp2_auto_point_temp[2] =
243 data->temp2_auto_point_temp[1] +
244 (data->pwm1_auto_point_pwm[2] -
245 data->pwm1_auto_point_pwm[1]) / reg;
246 else
247 data->temp2_auto_point_temp[2] = 255;
248
249 reg = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF1);
250 reg = (reg >> 5) & 0x3;
251 switch (reg) {
252 case 0: /*open loop: software sets pwm1*/
253 data->pwm1_auto_channels_temp = 0;
254 data->pwm1_enable = 1;
255 break;
256 case 2: /*closed loop: remote T (temp2)*/
257 data->pwm1_auto_channels_temp = 2;
258 data->pwm1_enable = 2;
259 break;
260 case 3: /*closed loop: local and remote T (temp2)*/
261 data->pwm1_auto_channels_temp = 3;
262 data->pwm1_enable = 3;
263 break;
264 case 1: /*
265 * semi-open loop: software sets rpm, chip controls
266 * pwm1, currently not implemented
267 */
268 data->pwm1_auto_channels_temp = 0;
269 data->pwm1_enable = 0;
270 break;
271 }
272
273 data->last_updated = jiffies;
274 data->valid = 1;
275 }
276 mutex_unlock(&data->update_lock);
277 return data;
278}
279
280static ssize_t get_temp(
281 struct device *dev,
282 struct device_attribute *devattr,
283 char *buf)
284{
285 struct amc6821_data *data = amc6821_update_device(dev);
286 int ix = to_sensor_dev_attr(devattr)->index;
287
288 return sprintf(buf, "%d\n", data->temp[ix] * 1000);
289}
290
291static ssize_t set_temp(
292 struct device *dev,
293 struct device_attribute *attr,
294 const char *buf,
295 size_t count)
296{
297 struct amc6821_data *data = dev_get_drvdata(dev);
298 struct i2c_client *client = data->client;
299 int ix = to_sensor_dev_attr(attr)->index;
300 long val;
301
302 int ret = kstrtol(buf, 10, &val);
303 if (ret)
304 return ret;
305 val = clamp_val(val / 1000, -128, 127);
306
307 mutex_lock(&data->update_lock);
308 data->temp[ix] = val;
309 if (i2c_smbus_write_byte_data(client, temp_reg[ix], data->temp[ix])) {
310 dev_err(&client->dev, "Register write error, aborting.\n");
311 count = -EIO;
312 }
313 mutex_unlock(&data->update_lock);
314 return count;
315}
316
317static ssize_t get_temp_alarm(
318 struct device *dev,
319 struct device_attribute *devattr,
320 char *buf)
321{
322 struct amc6821_data *data = amc6821_update_device(dev);
323 int ix = to_sensor_dev_attr(devattr)->index;
324 u8 flag;
325
326 switch (ix) {
327 case IDX_TEMP1_MIN:
328 flag = data->stat1 & AMC6821_STAT1_LTL;
329 break;
330 case IDX_TEMP1_MAX:
331 flag = data->stat1 & AMC6821_STAT1_LTH;
332 break;
333 case IDX_TEMP1_CRIT:
334 flag = data->stat2 & AMC6821_STAT2_LTC;
335 break;
336 case IDX_TEMP2_MIN:
337 flag = data->stat1 & AMC6821_STAT1_RTL;
338 break;
339 case IDX_TEMP2_MAX:
340 flag = data->stat1 & AMC6821_STAT1_RTH;
341 break;
342 case IDX_TEMP2_CRIT:
343 flag = data->stat2 & AMC6821_STAT2_RTC;
344 break;
345 default:
346 dev_dbg(dev, "Unknown attr->index (%d).\n", ix);
347 return -EINVAL;
348 }
349 if (flag)
350 return sprintf(buf, "1");
351 else
352 return sprintf(buf, "0");
353}
354
355static ssize_t get_temp2_fault(
356 struct device *dev,
357 struct device_attribute *devattr,
358 char *buf)
359{
360 struct amc6821_data *data = amc6821_update_device(dev);
361 if (data->stat1 & AMC6821_STAT1_RTF)
362 return sprintf(buf, "1");
363 else
364 return sprintf(buf, "0");
365}
366
367static ssize_t get_pwm1(
368 struct device *dev,
369 struct device_attribute *devattr,
370 char *buf)
371{
372 struct amc6821_data *data = amc6821_update_device(dev);
373 return sprintf(buf, "%d\n", data->pwm1);
374}
375
376static ssize_t set_pwm1(
377 struct device *dev,
378 struct device_attribute *devattr,
379 const char *buf,
380 size_t count)
381{
382 struct amc6821_data *data = dev_get_drvdata(dev);
383 struct i2c_client *client = data->client;
384 long val;
385 int ret = kstrtol(buf, 10, &val);
386 if (ret)
387 return ret;
388
389 mutex_lock(&data->update_lock);
390 data->pwm1 = clamp_val(val , 0, 255);
391 i2c_smbus_write_byte_data(client, AMC6821_REG_DCY, data->pwm1);
392 mutex_unlock(&data->update_lock);
393 return count;
394}
395
396static ssize_t get_pwm1_enable(
397 struct device *dev,
398 struct device_attribute *devattr,
399 char *buf)
400{
401 struct amc6821_data *data = amc6821_update_device(dev);
402 return sprintf(buf, "%d\n", data->pwm1_enable);
403}
404
405static ssize_t set_pwm1_enable(
406 struct device *dev,
407 struct device_attribute *attr,
408 const char *buf,
409 size_t count)
410{
411 struct amc6821_data *data = dev_get_drvdata(dev);
412 struct i2c_client *client = data->client;
413 long val;
414 int config = kstrtol(buf, 10, &val);
415 if (config)
416 return config;
417
418 mutex_lock(&data->update_lock);
419 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF1);
420 if (config < 0) {
421 dev_err(&client->dev,
422 "Error reading configuration register, aborting.\n");
423 count = config;
424 goto unlock;
425 }
426
427 switch (val) {
428 case 1:
429 config &= ~AMC6821_CONF1_FDRC0;
430 config &= ~AMC6821_CONF1_FDRC1;
431 break;
432 case 2:
433 config &= ~AMC6821_CONF1_FDRC0;
434 config |= AMC6821_CONF1_FDRC1;
435 break;
436 case 3:
437 config |= AMC6821_CONF1_FDRC0;
438 config |= AMC6821_CONF1_FDRC1;
439 break;
440 default:
441 count = -EINVAL;
442 goto unlock;
443 }
444 if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF1, config)) {
445 dev_err(&client->dev,
446 "Configuration register write error, aborting.\n");
447 count = -EIO;
448 }
449unlock:
450 mutex_unlock(&data->update_lock);
451 return count;
452}
453
454static ssize_t get_pwm1_auto_channels_temp(
455 struct device *dev,
456 struct device_attribute *devattr,
457 char *buf)
458{
459 struct amc6821_data *data = amc6821_update_device(dev);
460 return sprintf(buf, "%d\n", data->pwm1_auto_channels_temp);
461}
462
463static ssize_t get_temp_auto_point_temp(
464 struct device *dev,
465 struct device_attribute *devattr,
466 char *buf)
467{
468 int ix = to_sensor_dev_attr_2(devattr)->index;
469 int nr = to_sensor_dev_attr_2(devattr)->nr;
470 struct amc6821_data *data = amc6821_update_device(dev);
471 switch (nr) {
472 case 1:
473 return sprintf(buf, "%d\n",
474 data->temp1_auto_point_temp[ix] * 1000);
475 case 2:
476 return sprintf(buf, "%d\n",
477 data->temp2_auto_point_temp[ix] * 1000);
478 default:
479 dev_dbg(dev, "Unknown attr->nr (%d).\n", nr);
480 return -EINVAL;
481 }
482}
483
484static ssize_t get_pwm1_auto_point_pwm(
485 struct device *dev,
486 struct device_attribute *devattr,
487 char *buf)
488{
489 int ix = to_sensor_dev_attr(devattr)->index;
490 struct amc6821_data *data = amc6821_update_device(dev);
491 return sprintf(buf, "%d\n", data->pwm1_auto_point_pwm[ix]);
492}
493
494static inline ssize_t set_slope_register(struct i2c_client *client,
495 u8 reg,
496 u8 dpwm,
497 u8 *ptemp)
498{
499 int dt;
500 u8 tmp;
501
502 dt = ptemp[2]-ptemp[1];
503 for (tmp = 4; tmp > 0; tmp--) {
504 if (dt * (0x20 >> tmp) >= dpwm)
505 break;
506 }
507 tmp |= (ptemp[1] & 0x7C) << 1;
508 if (i2c_smbus_write_byte_data(client,
509 reg, tmp)) {
510 dev_err(&client->dev, "Register write error, aborting.\n");
511 return -EIO;
512 }
513 return 0;
514}
515
516static ssize_t set_temp_auto_point_temp(
517 struct device *dev,
518 struct device_attribute *attr,
519 const char *buf,
520 size_t count)
521{
522 struct amc6821_data *data = amc6821_update_device(dev);
523 struct i2c_client *client = data->client;
524 int ix = to_sensor_dev_attr_2(attr)->index;
525 int nr = to_sensor_dev_attr_2(attr)->nr;
526 u8 *ptemp;
527 u8 reg;
528 int dpwm;
529 long val;
530 int ret = kstrtol(buf, 10, &val);
531 if (ret)
532 return ret;
533
534 switch (nr) {
535 case 1:
536 ptemp = data->temp1_auto_point_temp;
537 reg = AMC6821_REG_LTEMP_FAN_CTRL;
538 break;
539 case 2:
540 ptemp = data->temp2_auto_point_temp;
541 reg = AMC6821_REG_RTEMP_FAN_CTRL;
542 break;
543 default:
544 dev_dbg(dev, "Unknown attr->nr (%d).\n", nr);
545 return -EINVAL;
546 }
547
548 mutex_lock(&data->update_lock);
549 data->valid = 0;
550
551 switch (ix) {
552 case 0:
553 ptemp[0] = clamp_val(val / 1000, 0,
554 data->temp1_auto_point_temp[1]);
555 ptemp[0] = clamp_val(ptemp[0], 0,
556 data->temp2_auto_point_temp[1]);
557 ptemp[0] = clamp_val(ptemp[0], 0, 63);
558 if (i2c_smbus_write_byte_data(
559 client,
560 AMC6821_REG_PSV_TEMP,
561 ptemp[0])) {
562 dev_err(&client->dev,
563 "Register write error, aborting.\n");
564 count = -EIO;
565 }
566 goto EXIT;
567 case 1:
568 ptemp[1] = clamp_val(val / 1000, (ptemp[0] & 0x7C) + 4, 124);
569 ptemp[1] &= 0x7C;
570 ptemp[2] = clamp_val(ptemp[2], ptemp[1] + 1, 255);
571 break;
572 case 2:
573 ptemp[2] = clamp_val(val / 1000, ptemp[1]+1, 255);
574 break;
575 default:
576 dev_dbg(dev, "Unknown attr->index (%d).\n", ix);
577 count = -EINVAL;
578 goto EXIT;
579 }
580 dpwm = data->pwm1_auto_point_pwm[2] - data->pwm1_auto_point_pwm[1];
581 if (set_slope_register(client, reg, dpwm, ptemp))
582 count = -EIO;
583
584EXIT:
585 mutex_unlock(&data->update_lock);
586 return count;
587}
588
589static ssize_t set_pwm1_auto_point_pwm(
590 struct device *dev,
591 struct device_attribute *attr,
592 const char *buf,
593 size_t count)
594{
595 struct amc6821_data *data = dev_get_drvdata(dev);
596 struct i2c_client *client = data->client;
597 int dpwm;
598 long val;
599 int ret = kstrtol(buf, 10, &val);
600 if (ret)
601 return ret;
602
603 mutex_lock(&data->update_lock);
604 data->pwm1_auto_point_pwm[1] = clamp_val(val, 0, 254);
605 if (i2c_smbus_write_byte_data(client, AMC6821_REG_DCY_LOW_TEMP,
606 data->pwm1_auto_point_pwm[1])) {
607 dev_err(&client->dev, "Register write error, aborting.\n");
608 count = -EIO;
609 goto EXIT;
610 }
611 dpwm = data->pwm1_auto_point_pwm[2] - data->pwm1_auto_point_pwm[1];
612 if (set_slope_register(client, AMC6821_REG_LTEMP_FAN_CTRL, dpwm,
613 data->temp1_auto_point_temp)) {
614 count = -EIO;
615 goto EXIT;
616 }
617 if (set_slope_register(client, AMC6821_REG_RTEMP_FAN_CTRL, dpwm,
618 data->temp2_auto_point_temp)) {
619 count = -EIO;
620 goto EXIT;
621 }
622
623EXIT:
624 data->valid = 0;
625 mutex_unlock(&data->update_lock);
626 return count;
627}
628
629static ssize_t get_fan(
630 struct device *dev,
631 struct device_attribute *devattr,
632 char *buf)
633{
634 struct amc6821_data *data = amc6821_update_device(dev);
635 int ix = to_sensor_dev_attr(devattr)->index;
636 if (0 == data->fan[ix])
637 return sprintf(buf, "0");
638 return sprintf(buf, "%d\n", (int)(6000000 / data->fan[ix]));
639}
640
641static ssize_t get_fan1_fault(
642 struct device *dev,
643 struct device_attribute *devattr,
644 char *buf)
645{
646 struct amc6821_data *data = amc6821_update_device(dev);
647 if (data->stat1 & AMC6821_STAT1_FANS)
648 return sprintf(buf, "1");
649 else
650 return sprintf(buf, "0");
651}
652
653static ssize_t set_fan(
654 struct device *dev,
655 struct device_attribute *attr,
656 const char *buf, size_t count)
657{
658 struct amc6821_data *data = dev_get_drvdata(dev);
659 struct i2c_client *client = data->client;
660 long val;
661 int ix = to_sensor_dev_attr(attr)->index;
662 int ret = kstrtol(buf, 10, &val);
663 if (ret)
664 return ret;
665 val = 1 > val ? 0xFFFF : 6000000/val;
666
667 mutex_lock(&data->update_lock);
668 data->fan[ix] = (u16) clamp_val(val, 1, 0xFFFF);
669 if (i2c_smbus_write_byte_data(client, fan_reg_low[ix],
670 data->fan[ix] & 0xFF)) {
671 dev_err(&client->dev, "Register write error, aborting.\n");
672 count = -EIO;
673 goto EXIT;
674 }
675 if (i2c_smbus_write_byte_data(client,
676 fan_reg_hi[ix], data->fan[ix] >> 8)) {
677 dev_err(&client->dev, "Register write error, aborting.\n");
678 count = -EIO;
679 }
680EXIT:
681 mutex_unlock(&data->update_lock);
682 return count;
683}
684
685static ssize_t get_fan1_div(
686 struct device *dev,
687 struct device_attribute *devattr,
688 char *buf)
689{
690 struct amc6821_data *data = amc6821_update_device(dev);
691 return sprintf(buf, "%d\n", data->fan1_div);
692}
693
694static ssize_t set_fan1_div(
695 struct device *dev,
696 struct device_attribute *attr,
697 const char *buf, size_t count)
698{
699 struct amc6821_data *data = dev_get_drvdata(dev);
700 struct i2c_client *client = data->client;
701 long val;
702 int config = kstrtol(buf, 10, &val);
703 if (config)
704 return config;
705
706 mutex_lock(&data->update_lock);
707 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF4);
708 if (config < 0) {
709 dev_err(&client->dev,
710 "Error reading configuration register, aborting.\n");
711 count = config;
712 goto EXIT;
713 }
714 switch (val) {
715 case 2:
716 config &= ~AMC6821_CONF4_PSPR;
717 data->fan1_div = 2;
718 break;
719 case 4:
720 config |= AMC6821_CONF4_PSPR;
721 data->fan1_div = 4;
722 break;
723 default:
724 count = -EINVAL;
725 goto EXIT;
726 }
727 if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF4, config)) {
728 dev_err(&client->dev,
729 "Configuration register write error, aborting.\n");
730 count = -EIO;
731 }
732EXIT:
733 mutex_unlock(&data->update_lock);
734 return count;
735}
736
737static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO,
738 get_temp, NULL, IDX_TEMP1_INPUT);
739static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO | S_IWUSR, get_temp,
740 set_temp, IDX_TEMP1_MIN);
741static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR, get_temp,
742 set_temp, IDX_TEMP1_MAX);
743static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO | S_IWUSR, get_temp,
744 set_temp, IDX_TEMP1_CRIT);
745static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO,
746 get_temp_alarm, NULL, IDX_TEMP1_MIN);
747static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO,
748 get_temp_alarm, NULL, IDX_TEMP1_MAX);
749static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO,
750 get_temp_alarm, NULL, IDX_TEMP1_CRIT);
751static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO,
752 get_temp, NULL, IDX_TEMP2_INPUT);
753static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO | S_IWUSR, get_temp,
754 set_temp, IDX_TEMP2_MIN);
755static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO | S_IWUSR, get_temp,
756 set_temp, IDX_TEMP2_MAX);
757static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO | S_IWUSR, get_temp,
758 set_temp, IDX_TEMP2_CRIT);
759static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO,
760 get_temp2_fault, NULL, 0);
761static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO,
762 get_temp_alarm, NULL, IDX_TEMP2_MIN);
763static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO,
764 get_temp_alarm, NULL, IDX_TEMP2_MAX);
765static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO,
766 get_temp_alarm, NULL, IDX_TEMP2_CRIT);
767static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, get_fan, NULL, IDX_FAN1_INPUT);
768static SENSOR_DEVICE_ATTR(fan1_min, S_IRUGO | S_IWUSR,
769 get_fan, set_fan, IDX_FAN1_MIN);
770static SENSOR_DEVICE_ATTR(fan1_max, S_IRUGO | S_IWUSR,
771 get_fan, set_fan, IDX_FAN1_MAX);
772static SENSOR_DEVICE_ATTR(fan1_fault, S_IRUGO, get_fan1_fault, NULL, 0);
773static SENSOR_DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR,
774 get_fan1_div, set_fan1_div, 0);
775
776static SENSOR_DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, get_pwm1, set_pwm1, 0);
777static SENSOR_DEVICE_ATTR(pwm1_enable, S_IWUSR | S_IRUGO,
778 get_pwm1_enable, set_pwm1_enable, 0);
779static SENSOR_DEVICE_ATTR(pwm1_auto_point1_pwm, S_IRUGO,
780 get_pwm1_auto_point_pwm, NULL, 0);
781static SENSOR_DEVICE_ATTR(pwm1_auto_point2_pwm, S_IWUSR | S_IRUGO,
782 get_pwm1_auto_point_pwm, set_pwm1_auto_point_pwm, 1);
783static SENSOR_DEVICE_ATTR(pwm1_auto_point3_pwm, S_IRUGO,
784 get_pwm1_auto_point_pwm, NULL, 2);
785static SENSOR_DEVICE_ATTR(pwm1_auto_channels_temp, S_IRUGO,
786 get_pwm1_auto_channels_temp, NULL, 0);
787static SENSOR_DEVICE_ATTR_2(temp1_auto_point1_temp, S_IRUGO,
788 get_temp_auto_point_temp, NULL, 1, 0);
789static SENSOR_DEVICE_ATTR_2(temp1_auto_point2_temp, S_IWUSR | S_IRUGO,
790 get_temp_auto_point_temp, set_temp_auto_point_temp, 1, 1);
791static SENSOR_DEVICE_ATTR_2(temp1_auto_point3_temp, S_IWUSR | S_IRUGO,
792 get_temp_auto_point_temp, set_temp_auto_point_temp, 1, 2);
793
794static SENSOR_DEVICE_ATTR_2(temp2_auto_point1_temp, S_IWUSR | S_IRUGO,
795 get_temp_auto_point_temp, set_temp_auto_point_temp, 2, 0);
796static SENSOR_DEVICE_ATTR_2(temp2_auto_point2_temp, S_IWUSR | S_IRUGO,
797 get_temp_auto_point_temp, set_temp_auto_point_temp, 2, 1);
798static SENSOR_DEVICE_ATTR_2(temp2_auto_point3_temp, S_IWUSR | S_IRUGO,
799 get_temp_auto_point_temp, set_temp_auto_point_temp, 2, 2);
800
801static struct attribute *amc6821_attrs[] = {
802 &sensor_dev_attr_temp1_input.dev_attr.attr,
803 &sensor_dev_attr_temp1_min.dev_attr.attr,
804 &sensor_dev_attr_temp1_max.dev_attr.attr,
805 &sensor_dev_attr_temp1_crit.dev_attr.attr,
806 &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
807 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
808 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
809 &sensor_dev_attr_temp2_input.dev_attr.attr,
810 &sensor_dev_attr_temp2_min.dev_attr.attr,
811 &sensor_dev_attr_temp2_max.dev_attr.attr,
812 &sensor_dev_attr_temp2_crit.dev_attr.attr,
813 &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
814 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
815 &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
816 &sensor_dev_attr_temp2_fault.dev_attr.attr,
817 &sensor_dev_attr_fan1_input.dev_attr.attr,
818 &sensor_dev_attr_fan1_min.dev_attr.attr,
819 &sensor_dev_attr_fan1_max.dev_attr.attr,
820 &sensor_dev_attr_fan1_fault.dev_attr.attr,
821 &sensor_dev_attr_fan1_div.dev_attr.attr,
822 &sensor_dev_attr_pwm1.dev_attr.attr,
823 &sensor_dev_attr_pwm1_enable.dev_attr.attr,
824 &sensor_dev_attr_pwm1_auto_channels_temp.dev_attr.attr,
825 &sensor_dev_attr_pwm1_auto_point1_pwm.dev_attr.attr,
826 &sensor_dev_attr_pwm1_auto_point2_pwm.dev_attr.attr,
827 &sensor_dev_attr_pwm1_auto_point3_pwm.dev_attr.attr,
828 &sensor_dev_attr_temp1_auto_point1_temp.dev_attr.attr,
829 &sensor_dev_attr_temp1_auto_point2_temp.dev_attr.attr,
830 &sensor_dev_attr_temp1_auto_point3_temp.dev_attr.attr,
831 &sensor_dev_attr_temp2_auto_point1_temp.dev_attr.attr,
832 &sensor_dev_attr_temp2_auto_point2_temp.dev_attr.attr,
833 &sensor_dev_attr_temp2_auto_point3_temp.dev_attr.attr,
834 NULL
835};
836
837ATTRIBUTE_GROUPS(amc6821);
838
839/* Return 0 if detection is successful, -ENODEV otherwise */
840static int amc6821_detect(
841 struct i2c_client *client,
842 struct i2c_board_info *info)
843{
844 struct i2c_adapter *adapter = client->adapter;
845 int address = client->addr;
846 int dev_id, comp_id;
847
848 dev_dbg(&adapter->dev, "amc6821_detect called.\n");
849
850 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
851 dev_dbg(&adapter->dev,
852 "amc6821: I2C bus doesn't support byte mode, "
853 "skipping.\n");
854 return -ENODEV;
855 }
856
857 dev_id = i2c_smbus_read_byte_data(client, AMC6821_REG_DEV_ID);
858 comp_id = i2c_smbus_read_byte_data(client, AMC6821_REG_COMP_ID);
859 if (dev_id != 0x21 || comp_id != 0x49) {
860 dev_dbg(&adapter->dev,
861 "amc6821: detection failed at 0x%02x.\n",
862 address);
863 return -ENODEV;
864 }
865
866 /*
867 * Bit 7 of the address register is ignored, so we can check the
868 * ID registers again
869 */
870 dev_id = i2c_smbus_read_byte_data(client, 0x80 | AMC6821_REG_DEV_ID);
871 comp_id = i2c_smbus_read_byte_data(client, 0x80 | AMC6821_REG_COMP_ID);
872 if (dev_id != 0x21 || comp_id != 0x49) {
873 dev_dbg(&adapter->dev,
874 "amc6821: detection failed at 0x%02x.\n",
875 address);
876 return -ENODEV;
877 }
878
879 dev_info(&adapter->dev, "amc6821: chip found at 0x%02x.\n", address);
880 strlcpy(info->type, "amc6821", I2C_NAME_SIZE);
881
882 return 0;
883}
884
885static int amc6821_init_client(struct i2c_client *client)
886{
887 int config;
888 int err = -EIO;
889
890 if (init) {
891 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF4);
892
893 if (config < 0) {
894 dev_err(&client->dev,
895 "Error reading configuration register, aborting.\n");
896 return err;
897 }
898
899 config |= AMC6821_CONF4_MODE;
900
901 if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF4,
902 config)) {
903 dev_err(&client->dev,
904 "Configuration register write error, aborting.\n");
905 return err;
906 }
907
908 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF3);
909
910 if (config < 0) {
911 dev_err(&client->dev,
912 "Error reading configuration register, aborting.\n");
913 return err;
914 }
915
916 dev_info(&client->dev, "Revision %d\n", config & 0x0f);
917
918 config &= ~AMC6821_CONF3_THERM_FAN_EN;
919
920 if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF3,
921 config)) {
922 dev_err(&client->dev,
923 "Configuration register write error, aborting.\n");
924 return err;
925 }
926
927 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF2);
928
929 if (config < 0) {
930 dev_err(&client->dev,
931 "Error reading configuration register, aborting.\n");
932 return err;
933 }
934
935 config &= ~AMC6821_CONF2_RTFIE;
936 config &= ~AMC6821_CONF2_LTOIE;
937 config &= ~AMC6821_CONF2_RTOIE;
938 if (i2c_smbus_write_byte_data(client,
939 AMC6821_REG_CONF2, config)) {
940 dev_err(&client->dev,
941 "Configuration register write error, aborting.\n");
942 return err;
943 }
944
945 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF1);
946
947 if (config < 0) {
948 dev_err(&client->dev,
949 "Error reading configuration register, aborting.\n");
950 return err;
951 }
952
953 config &= ~AMC6821_CONF1_THERMOVIE;
954 config &= ~AMC6821_CONF1_FANIE;
955 config |= AMC6821_CONF1_START;
956 if (pwminv)
957 config |= AMC6821_CONF1_PWMINV;
958 else
959 config &= ~AMC6821_CONF1_PWMINV;
960
961 if (i2c_smbus_write_byte_data(
962 client, AMC6821_REG_CONF1, config)) {
963 dev_err(&client->dev,
964 "Configuration register write error, aborting.\n");
965 return err;
966 }
967 }
968 return 0;
969}
970
971static int amc6821_probe(struct i2c_client *client,
972 const struct i2c_device_id *id)
973{
974 struct device *dev = &client->dev;
975 struct amc6821_data *data;
976 struct device *hwmon_dev;
977 int err;
978
979 data = devm_kzalloc(dev, sizeof(struct amc6821_data), GFP_KERNEL);
980 if (!data)
981 return -ENOMEM;
982
983 data->client = client;
984 mutex_init(&data->update_lock);
985
986 /*
987 * Initialize the amc6821 chip
988 */
989 err = amc6821_init_client(client);
990 if (err)
991 return err;
992
993 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
994 data,
995 amc6821_groups);
996 return PTR_ERR_OR_ZERO(hwmon_dev);
997}
998
999static const struct i2c_device_id amc6821_id[] = {
1000 { "amc6821", amc6821 },
1001 { }
1002};
1003
1004MODULE_DEVICE_TABLE(i2c, amc6821_id);
1005
1006static struct i2c_driver amc6821_driver = {
1007 .class = I2C_CLASS_HWMON,
1008 .driver = {
1009 .name = "amc6821",
1010 },
1011 .probe = amc6821_probe,
1012 .id_table = amc6821_id,
1013 .detect = amc6821_detect,
1014 .address_list = normal_i2c,
1015};
1016
1017module_i2c_driver(amc6821_driver);
1018
1019MODULE_LICENSE("GPL");
1020MODULE_AUTHOR("T. Mertelj <tomaz.mertelj@guest.arnes.si>");
1021MODULE_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 * Conversion to regmap and with_info API:
11 * Copyright (C) 2024 Guenter Roeck <linux@roeck-us.net>
12 */
13
14#include <linux/bitfield.h>
15#include <linux/bitops.h>
16#include <linux/bits.h>
17#include <linux/err.h>
18#include <linux/hwmon.h>
19#include <linux/hwmon-sysfs.h>
20#include <linux/i2c.h>
21#include <linux/init.h>
22#include <linux/minmax.h>
23#include <linux/module.h>
24#include <linux/mutex.h>
25#include <linux/of_platform.h>
26#include <linux/regmap.h>
27#include <linux/slab.h>
28
29/*
30 * Addresses to scan.
31 */
32
33static const unsigned short normal_i2c[] = {0x18, 0x19, 0x1a, 0x2c, 0x2d, 0x2e,
34 0x4c, 0x4d, 0x4e, I2C_CLIENT_END};
35
36/*
37 * Insmod parameters
38 */
39
40static int pwminv; /*Inverted PWM output. */
41module_param(pwminv, int, 0444);
42
43static int init = 1; /*Power-on initialization.*/
44module_param(init, int, 0444);
45
46#define AMC6821_REG_DEV_ID 0x3D
47#define AMC6821_REG_COMP_ID 0x3E
48#define AMC6821_REG_CONF1 0x00
49#define AMC6821_REG_CONF2 0x01
50#define AMC6821_REG_CONF3 0x3F
51#define AMC6821_REG_CONF4 0x04
52#define AMC6821_REG_STAT1 0x02
53#define AMC6821_REG_STAT2 0x03
54#define AMC6821_REG_TEMP_LO 0x06
55#define AMC6821_REG_TDATA_LOW 0x08
56#define AMC6821_REG_TDATA_HI 0x09
57#define AMC6821_REG_LTEMP_HI 0x0A
58#define AMC6821_REG_RTEMP_HI 0x0B
59#define AMC6821_REG_LTEMP_LIMIT_MIN 0x15
60#define AMC6821_REG_LTEMP_LIMIT_MAX 0x14
61#define AMC6821_REG_RTEMP_LIMIT_MIN 0x19
62#define AMC6821_REG_RTEMP_LIMIT_MAX 0x18
63#define AMC6821_REG_LTEMP_CRIT 0x1B
64#define AMC6821_REG_RTEMP_CRIT 0x1D
65#define AMC6821_REG_PSV_TEMP 0x1C
66#define AMC6821_REG_DCY 0x22
67#define AMC6821_REG_LTEMP_FAN_CTRL 0x24
68#define AMC6821_REG_RTEMP_FAN_CTRL 0x25
69#define AMC6821_REG_DCY_LOW_TEMP 0x21
70
71#define AMC6821_REG_TACH_LLIMITL 0x10
72#define AMC6821_REG_TACH_HLIMITL 0x12
73#define AMC6821_REG_TACH_SETTINGL 0x1e
74
75#define AMC6821_CONF1_START BIT(0)
76#define AMC6821_CONF1_FAN_INT_EN BIT(1)
77#define AMC6821_CONF1_FANIE BIT(2)
78#define AMC6821_CONF1_PWMINV BIT(3)
79#define AMC6821_CONF1_FAN_FAULT_EN BIT(4)
80#define AMC6821_CONF1_FDRC0 BIT(5)
81#define AMC6821_CONF1_FDRC1 BIT(6)
82#define AMC6821_CONF1_THERMOVIE BIT(7)
83
84#define AMC6821_CONF2_PWM_EN BIT(0)
85#define AMC6821_CONF2_TACH_MODE BIT(1)
86#define AMC6821_CONF2_TACH_EN BIT(2)
87#define AMC6821_CONF2_RTFIE BIT(3)
88#define AMC6821_CONF2_LTOIE BIT(4)
89#define AMC6821_CONF2_RTOIE BIT(5)
90#define AMC6821_CONF2_PSVIE BIT(6)
91#define AMC6821_CONF2_RST BIT(7)
92
93#define AMC6821_CONF3_THERM_FAN_EN BIT(7)
94#define AMC6821_CONF3_REV_MASK GENMASK(3, 0)
95
96#define AMC6821_CONF4_OVREN BIT(4)
97#define AMC6821_CONF4_TACH_FAST BIT(5)
98#define AMC6821_CONF4_PSPR BIT(6)
99#define AMC6821_CONF4_MODE BIT(7)
100
101#define AMC6821_STAT1_RPM_ALARM BIT(0)
102#define AMC6821_STAT1_FANS BIT(1)
103#define AMC6821_STAT1_RTH BIT(2)
104#define AMC6821_STAT1_RTL BIT(3)
105#define AMC6821_STAT1_R_THERM BIT(4)
106#define AMC6821_STAT1_RTF BIT(5)
107#define AMC6821_STAT1_LTH BIT(6)
108#define AMC6821_STAT1_LTL BIT(7)
109
110#define AMC6821_STAT2_RTC BIT(3)
111#define AMC6821_STAT2_LTC BIT(4)
112#define AMC6821_STAT2_LPSV BIT(5)
113#define AMC6821_STAT2_L_THERM BIT(6)
114#define AMC6821_STAT2_THERM_IN BIT(7)
115
116#define AMC6821_TEMP_SLOPE_MASK GENMASK(2, 0)
117#define AMC6821_TEMP_LIMIT_MASK GENMASK(7, 3)
118
119/*
120 * Client data (each client gets its own)
121 */
122
123struct amc6821_data {
124 struct regmap *regmap;
125 struct mutex update_lock;
126};
127
128/*
129 * Return 0 on success or negative error code.
130 *
131 * temps returns set of three temperatures, in °C:
132 * temps[0]: Passive cooling temperature, applies to both channels
133 * temps[1]: Low temperature, start slope calculations
134 * temps[2]: High temperature
135 *
136 * Channel 0: local, channel 1: remote.
137 */
138static int amc6821_get_auto_point_temps(struct regmap *regmap, int channel, u8 *temps)
139{
140 u32 regs[] = {
141 AMC6821_REG_DCY_LOW_TEMP,
142 AMC6821_REG_PSV_TEMP,
143 channel ? AMC6821_REG_RTEMP_FAN_CTRL : AMC6821_REG_LTEMP_FAN_CTRL
144 };
145 u8 regvals[3];
146 int slope;
147 int err;
148
149 err = regmap_multi_reg_read(regmap, regs, regvals, 3);
150 if (err)
151 return err;
152 temps[0] = regvals[1];
153 temps[1] = FIELD_GET(AMC6821_TEMP_LIMIT_MASK, regvals[2]) * 4;
154
155 /* slope is 32 >> <slope bits> in °C */
156 slope = 32 >> FIELD_GET(AMC6821_TEMP_SLOPE_MASK, regvals[2]);
157 if (slope)
158 temps[2] = temps[1] + DIV_ROUND_CLOSEST(255 - regvals[0], slope);
159 else
160 temps[2] = 255;
161
162 return 0;
163}
164
165static int amc6821_temp_read_values(struct regmap *regmap, u32 attr, int channel, long *val)
166{
167 int reg, err;
168 u32 regval;
169
170 switch (attr) {
171 case hwmon_temp_input:
172 reg = channel ? AMC6821_REG_RTEMP_HI : AMC6821_REG_LTEMP_HI;
173 break;
174 case hwmon_temp_min:
175 reg = channel ? AMC6821_REG_RTEMP_LIMIT_MIN : AMC6821_REG_LTEMP_LIMIT_MIN;
176 break;
177 case hwmon_temp_max:
178 reg = channel ? AMC6821_REG_RTEMP_LIMIT_MAX : AMC6821_REG_LTEMP_LIMIT_MAX;
179 break;
180 case hwmon_temp_crit:
181 reg = channel ? AMC6821_REG_RTEMP_CRIT : AMC6821_REG_LTEMP_CRIT;
182 break;
183 default:
184 return -EOPNOTSUPP;
185 }
186 err = regmap_read(regmap, reg, ®val);
187 if (err)
188 return err;
189 *val = sign_extend32(regval, 7) * 1000;
190 return 0;
191}
192
193static int amc6821_read_alarms(struct regmap *regmap, enum hwmon_sensor_types type,
194 u32 attr, int channel, long *val)
195{
196 int reg, mask, err;
197 u32 regval;
198
199 switch (type) {
200 case hwmon_temp:
201 switch (attr) {
202 case hwmon_temp_min_alarm:
203 reg = AMC6821_REG_STAT1;
204 mask = channel ? AMC6821_STAT1_RTL : AMC6821_STAT1_LTL;
205 break;
206 case hwmon_temp_max_alarm:
207 reg = AMC6821_REG_STAT1;
208 mask = channel ? AMC6821_STAT1_RTH : AMC6821_STAT1_LTH;
209 break;
210 case hwmon_temp_crit_alarm:
211 reg = AMC6821_REG_STAT2;
212 mask = channel ? AMC6821_STAT2_RTC : AMC6821_STAT2_LTC;
213 break;
214 case hwmon_temp_fault:
215 reg = AMC6821_REG_STAT1;
216 mask = AMC6821_STAT1_RTF;
217 break;
218 default:
219 return -EOPNOTSUPP;
220 }
221 break;
222 case hwmon_fan:
223 switch (attr) {
224 case hwmon_fan_fault:
225 reg = AMC6821_REG_STAT1;
226 mask = AMC6821_STAT1_FANS;
227 break;
228 default:
229 return -EOPNOTSUPP;
230 }
231 break;
232 default:
233 return -EOPNOTSUPP;
234 }
235 err = regmap_read(regmap, reg, ®val);
236 if (err)
237 return err;
238 *val = !!(regval & mask);
239 return 0;
240}
241
242static int amc6821_temp_read(struct device *dev, u32 attr, int channel, long *val)
243{
244 struct amc6821_data *data = dev_get_drvdata(dev);
245
246 switch (attr) {
247 case hwmon_temp_input:
248 case hwmon_temp_min:
249 case hwmon_temp_max:
250 case hwmon_temp_crit:
251 return amc6821_temp_read_values(data->regmap, attr, channel, val);
252 case hwmon_temp_min_alarm:
253 case hwmon_temp_max_alarm:
254 case hwmon_temp_crit_alarm:
255 case hwmon_temp_fault:
256 return amc6821_read_alarms(data->regmap, hwmon_temp, attr, channel, val);
257 default:
258 return -EOPNOTSUPP;
259 }
260}
261
262static int amc6821_temp_write(struct device *dev, u32 attr, int channel, long val)
263{
264 struct amc6821_data *data = dev_get_drvdata(dev);
265 int reg;
266
267 val = DIV_ROUND_CLOSEST(clamp_val(val, -128000, 127000), 1000);
268
269 switch (attr) {
270 case hwmon_temp_min:
271 reg = channel ? AMC6821_REG_RTEMP_LIMIT_MIN : AMC6821_REG_LTEMP_LIMIT_MIN;
272 break;
273 case hwmon_temp_max:
274 reg = channel ? AMC6821_REG_RTEMP_LIMIT_MAX : AMC6821_REG_LTEMP_LIMIT_MAX;
275 break;
276 case hwmon_temp_crit:
277 reg = channel ? AMC6821_REG_RTEMP_CRIT : AMC6821_REG_LTEMP_CRIT;
278 break;
279 default:
280 return -EOPNOTSUPP;
281 }
282 return regmap_write(data->regmap, reg, val);
283}
284
285static int amc6821_pwm_read(struct device *dev, u32 attr, long *val)
286{
287 struct amc6821_data *data = dev_get_drvdata(dev);
288 struct regmap *regmap = data->regmap;
289 u32 regval;
290 int err;
291
292 switch (attr) {
293 case hwmon_pwm_enable:
294 err = regmap_read(regmap, AMC6821_REG_CONF1, ®val);
295 if (err)
296 return err;
297 switch (regval & (AMC6821_CONF1_FDRC0 | AMC6821_CONF1_FDRC1)) {
298 case 0:
299 *val = 1; /* manual */
300 break;
301 case AMC6821_CONF1_FDRC0:
302 *val = 4; /* target rpm (fan1_target) controlled */
303 break;
304 case AMC6821_CONF1_FDRC1:
305 *val = 2; /* remote temp controlled */
306 break;
307 default:
308 *val = 3; /* max(local, remote) temp controlled */
309 break;
310 }
311 return 0;
312 case hwmon_pwm_mode:
313 err = regmap_read(regmap, AMC6821_REG_CONF2, ®val);
314 if (err)
315 return err;
316 *val = !!(regval & AMC6821_CONF2_TACH_MODE);
317 return 0;
318 case hwmon_pwm_auto_channels_temp:
319 err = regmap_read(regmap, AMC6821_REG_CONF1, ®val);
320 if (err)
321 return err;
322 switch (regval & (AMC6821_CONF1_FDRC0 | AMC6821_CONF1_FDRC1)) {
323 case 0:
324 case AMC6821_CONF1_FDRC0:
325 *val = 0; /* manual or target rpm controlled */
326 break;
327 case AMC6821_CONF1_FDRC1:
328 *val = 2; /* remote temp controlled */
329 break;
330 default:
331 *val = 3; /* max(local, remote) temp controlled */
332 break;
333 }
334 return 0;
335 case hwmon_pwm_input:
336 err = regmap_read(regmap, AMC6821_REG_DCY, ®val);
337 if (err)
338 return err;
339 *val = regval;
340 return 0;
341 default:
342 return -EOPNOTSUPP;
343 }
344}
345
346static int amc6821_pwm_write(struct device *dev, u32 attr, long val)
347{
348 struct amc6821_data *data = dev_get_drvdata(dev);
349 struct regmap *regmap = data->regmap;
350 u32 mode;
351
352 switch (attr) {
353 case hwmon_pwm_enable:
354 switch (val) {
355 case 1:
356 mode = 0;
357 break;
358 case 2:
359 mode = AMC6821_CONF1_FDRC1;
360 break;
361 case 3:
362 mode = AMC6821_CONF1_FDRC0 | AMC6821_CONF1_FDRC1;
363 break;
364 case 4:
365 mode = AMC6821_CONF1_FDRC0;
366 break;
367 default:
368 return -EINVAL;
369 }
370 return regmap_update_bits(regmap, AMC6821_REG_CONF1,
371 AMC6821_CONF1_FDRC0 | AMC6821_CONF1_FDRC1,
372 mode);
373 case hwmon_pwm_mode:
374 if (val < 0 || val > 1)
375 return -EINVAL;
376 return regmap_update_bits(regmap, AMC6821_REG_CONF2,
377 AMC6821_CONF2_TACH_MODE,
378 val ? AMC6821_CONF2_TACH_MODE : 0);
379 break;
380 case hwmon_pwm_input:
381 if (val < 0 || val > 255)
382 return -EINVAL;
383 return regmap_write(regmap, AMC6821_REG_DCY, val);
384 default:
385 return -EOPNOTSUPP;
386 }
387}
388
389static int amc6821_fan_read_rpm(struct regmap *regmap, u32 attr, long *val)
390{
391 int reg, err;
392 u8 regs[2];
393 u32 regval;
394
395 switch (attr) {
396 case hwmon_fan_input:
397 reg = AMC6821_REG_TDATA_LOW;
398 break;
399 case hwmon_fan_min:
400 reg = AMC6821_REG_TACH_LLIMITL;
401 break;
402 case hwmon_fan_max:
403 reg = AMC6821_REG_TACH_HLIMITL;
404 break;
405 case hwmon_fan_target:
406 reg = AMC6821_REG_TACH_SETTINGL;
407 break;
408 default:
409 return -EOPNOTSUPP;
410 }
411
412 err = regmap_bulk_read(regmap, reg, regs, 2);
413 if (err)
414 return err;
415
416 regval = (regs[1] << 8) | regs[0];
417 *val = regval ? 6000000 / regval : 0;
418
419 return 0;
420}
421
422static int amc6821_fan_read(struct device *dev, u32 attr, long *val)
423{
424 struct amc6821_data *data = dev_get_drvdata(dev);
425 struct regmap *regmap = data->regmap;
426 u32 regval;
427 int err;
428
429 switch (attr) {
430 case hwmon_fan_input:
431 case hwmon_fan_min:
432 case hwmon_fan_max:
433 case hwmon_fan_target:
434 return amc6821_fan_read_rpm(regmap, attr, val);
435 case hwmon_fan_fault:
436 return amc6821_read_alarms(regmap, hwmon_fan, attr, 0, val);
437 case hwmon_fan_pulses:
438 err = regmap_read(regmap, AMC6821_REG_CONF4, ®val);
439 if (err)
440 return err;
441 *val = (regval & AMC6821_CONF4_PSPR) ? 4 : 2;
442 return 0;
443 default:
444 return -EOPNOTSUPP;
445 }
446}
447
448static int amc6821_fan_write(struct device *dev, u32 attr, long val)
449{
450 struct amc6821_data *data = dev_get_drvdata(dev);
451 struct regmap *regmap = data->regmap;
452 u8 regs[2];
453 int reg;
454
455 if (attr == hwmon_fan_pulses) {
456 if (val != 2 && val != 4)
457 return -EINVAL;
458 return regmap_update_bits(regmap, AMC6821_REG_CONF4,
459 AMC6821_CONF4_PSPR,
460 val == 4 ? AMC6821_CONF4_PSPR : 0);
461 }
462
463 if (val < 0)
464 return -EINVAL;
465
466 switch (attr) {
467 case hwmon_fan_min:
468 if (!val) /* no unlimited minimum speed */
469 return -EINVAL;
470 reg = AMC6821_REG_TACH_LLIMITL;
471 break;
472 case hwmon_fan_max:
473 reg = AMC6821_REG_TACH_HLIMITL;
474 break;
475 case hwmon_fan_target:
476 if (!val) /* no unlimited target speed */
477 return -EINVAL;
478 reg = AMC6821_REG_TACH_SETTINGL;
479 break;
480 default:
481 return -EOPNOTSUPP;
482 }
483
484 val = val ? 6000000 / clamp_val(val, 1, 6000000) : 0;
485 val = clamp_val(val, 0, 0xffff);
486
487 regs[0] = val & 0xff;
488 regs[1] = val >> 8;
489
490 return regmap_bulk_write(data->regmap, reg, regs, 2);
491}
492
493static ssize_t temp_auto_point_temp_show(struct device *dev,
494 struct device_attribute *devattr,
495 char *buf)
496{
497 struct amc6821_data *data = dev_get_drvdata(dev);
498 int ix = to_sensor_dev_attr_2(devattr)->index;
499 int nr = to_sensor_dev_attr_2(devattr)->nr;
500 u8 temps[3];
501 int err;
502
503 mutex_lock(&data->update_lock);
504 err = amc6821_get_auto_point_temps(data->regmap, nr, temps);
505 mutex_unlock(&data->update_lock);
506 if (err)
507 return err;
508
509 return sysfs_emit(buf, "%d\n", temps[ix] * 1000);
510}
511
512static ssize_t pwm1_auto_point_pwm_show(struct device *dev,
513 struct device_attribute *devattr,
514 char *buf)
515{
516 struct amc6821_data *data = dev_get_drvdata(dev);
517 int ix = to_sensor_dev_attr(devattr)->index;
518 u32 val;
519 int err;
520
521 switch (ix) {
522 case 0:
523 val = 0;
524 break;
525 case 1:
526 err = regmap_read(data->regmap, AMC6821_REG_DCY_LOW_TEMP, &val);
527 if (err)
528 return err;
529 break;
530 default:
531 val = 255;
532 break;
533 }
534 return sysfs_emit(buf, "%d\n", val);
535}
536
537/*
538 * Set TEMP[0-4] (low temperature) and SLP[0-2] (slope) of local or remote
539 * TEMP-FAN control register.
540 *
541 * Return 0 on success or negative error code.
542 *
543 * Channel 0: local, channel 1: remote
544 */
545static inline int set_slope_register(struct regmap *regmap, int channel, u8 *temps)
546{
547 u8 regval = FIELD_PREP(AMC6821_TEMP_LIMIT_MASK, temps[1] / 4);
548 u8 tmp, dpwm;
549 int err, dt;
550 u32 pwm;
551
552 err = regmap_read(regmap, AMC6821_REG_DCY_LOW_TEMP, &pwm);
553 if (err)
554 return err;
555
556 dpwm = 255 - pwm;
557
558 dt = temps[2] - temps[1];
559 for (tmp = 4; tmp > 0; tmp--) {
560 if (dt * (32 >> tmp) >= dpwm)
561 break;
562 }
563 regval |= FIELD_PREP(AMC6821_TEMP_SLOPE_MASK, tmp);
564
565 return regmap_write(regmap,
566 channel ? AMC6821_REG_RTEMP_FAN_CTRL : AMC6821_REG_LTEMP_FAN_CTRL,
567 regval);
568}
569
570static ssize_t temp_auto_point_temp_store(struct device *dev,
571 struct device_attribute *attr,
572 const char *buf, size_t count)
573{
574 struct amc6821_data *data = dev_get_drvdata(dev);
575 int ix = to_sensor_dev_attr_2(attr)->index;
576 int nr = to_sensor_dev_attr_2(attr)->nr;
577 struct regmap *regmap = data->regmap;
578 u8 temps[3], otemps[3];
579 long val;
580 int ret;
581
582 ret = kstrtol(buf, 10, &val);
583 if (ret)
584 return ret;
585
586 mutex_lock(&data->update_lock);
587
588 ret = amc6821_get_auto_point_temps(data->regmap, nr, temps);
589 if (ret)
590 goto unlock;
591
592 switch (ix) {
593 case 0:
594 /*
595 * Passive cooling temperature. Range limit against low limit
596 * of both channels.
597 */
598 ret = amc6821_get_auto_point_temps(data->regmap, 1 - nr, otemps);
599 if (ret)
600 goto unlock;
601 val = DIV_ROUND_CLOSEST(clamp_val(val, 0, 63000), 1000);
602 val = clamp_val(val, 0, min(temps[1], otemps[1]));
603 ret = regmap_write(regmap, AMC6821_REG_PSV_TEMP, val);
604 break;
605 case 1:
606 /*
607 * Low limit; must be between passive and high limit,
608 * and not exceed 124. Step size is 4 degrees C.
609 */
610 val = clamp_val(val, DIV_ROUND_UP(temps[0], 4) * 4000, 124000);
611 temps[1] = DIV_ROUND_CLOSEST(val, 4000) * 4;
612 val = temps[1] / 4;
613 /* Auto-adjust high limit if necessary */
614 temps[2] = clamp_val(temps[2], temps[1] + 1, 255);
615 ret = set_slope_register(regmap, nr, temps);
616 break;
617 case 2:
618 /* high limit, must be higher than low limit */
619 val = clamp_val(val, (temps[1] + 1) * 1000, 255000);
620 temps[2] = DIV_ROUND_CLOSEST(val, 1000);
621 ret = set_slope_register(regmap, nr, temps);
622 break;
623 default:
624 ret = -EINVAL;
625 break;
626 }
627unlock:
628 mutex_unlock(&data->update_lock);
629 return ret ? : count;
630}
631
632static ssize_t pwm1_auto_point_pwm_store(struct device *dev,
633 struct device_attribute *attr,
634 const char *buf, size_t count)
635{
636 struct amc6821_data *data = dev_get_drvdata(dev);
637 struct regmap *regmap = data->regmap;
638 int i, ret;
639 u8 val;
640
641 ret = kstrtou8(buf, 10, &val);
642 if (ret)
643 return ret;
644
645 mutex_lock(&data->update_lock);
646 ret = regmap_write(regmap, AMC6821_REG_DCY_LOW_TEMP, val);
647 if (ret)
648 goto unlock;
649
650 for (i = 0; i < 2; i++) {
651 u8 temps[3];
652
653 ret = amc6821_get_auto_point_temps(regmap, i, temps);
654 if (ret)
655 break;
656 ret = set_slope_register(regmap, i, temps);
657 if (ret)
658 break;
659 }
660unlock:
661 mutex_unlock(&data->update_lock);
662 return ret ? : count;
663}
664
665static SENSOR_DEVICE_ATTR_RO(pwm1_auto_point1_pwm, pwm1_auto_point_pwm, 0);
666static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point2_pwm, pwm1_auto_point_pwm, 1);
667static SENSOR_DEVICE_ATTR_RO(pwm1_auto_point3_pwm, pwm1_auto_point_pwm, 2);
668static SENSOR_DEVICE_ATTR_2_RO(temp1_auto_point1_temp, temp_auto_point_temp,
669 0, 0);
670static SENSOR_DEVICE_ATTR_2_RW(temp1_auto_point2_temp, temp_auto_point_temp,
671 0, 1);
672static SENSOR_DEVICE_ATTR_2_RW(temp1_auto_point3_temp, temp_auto_point_temp,
673 0, 2);
674
675static SENSOR_DEVICE_ATTR_2_RW(temp2_auto_point1_temp, temp_auto_point_temp,
676 1, 0);
677static SENSOR_DEVICE_ATTR_2_RW(temp2_auto_point2_temp, temp_auto_point_temp,
678 1, 1);
679static SENSOR_DEVICE_ATTR_2_RW(temp2_auto_point3_temp, temp_auto_point_temp,
680 1, 2);
681
682static struct attribute *amc6821_attrs[] = {
683 &sensor_dev_attr_pwm1_auto_point1_pwm.dev_attr.attr,
684 &sensor_dev_attr_pwm1_auto_point2_pwm.dev_attr.attr,
685 &sensor_dev_attr_pwm1_auto_point3_pwm.dev_attr.attr,
686 &sensor_dev_attr_temp1_auto_point1_temp.dev_attr.attr,
687 &sensor_dev_attr_temp1_auto_point2_temp.dev_attr.attr,
688 &sensor_dev_attr_temp1_auto_point3_temp.dev_attr.attr,
689 &sensor_dev_attr_temp2_auto_point1_temp.dev_attr.attr,
690 &sensor_dev_attr_temp2_auto_point2_temp.dev_attr.attr,
691 &sensor_dev_attr_temp2_auto_point3_temp.dev_attr.attr,
692 NULL
693};
694ATTRIBUTE_GROUPS(amc6821);
695
696static int amc6821_read(struct device *dev, enum hwmon_sensor_types type,
697 u32 attr, int channel, long *val)
698{
699 switch (type) {
700 case hwmon_temp:
701 return amc6821_temp_read(dev, attr, channel, val);
702 case hwmon_fan:
703 return amc6821_fan_read(dev, attr, val);
704 case hwmon_pwm:
705 return amc6821_pwm_read(dev, attr, val);
706 default:
707 return -EOPNOTSUPP;
708 }
709}
710
711static int amc6821_write(struct device *dev, enum hwmon_sensor_types type,
712 u32 attr, int channel, long val)
713{
714 switch (type) {
715 case hwmon_temp:
716 return amc6821_temp_write(dev, attr, channel, val);
717 case hwmon_fan:
718 return amc6821_fan_write(dev, attr, val);
719 case hwmon_pwm:
720 return amc6821_pwm_write(dev, attr, val);
721 default:
722 return -EOPNOTSUPP;
723 }
724}
725
726static umode_t amc6821_is_visible(const void *data,
727 enum hwmon_sensor_types type,
728 u32 attr, int channel)
729{
730 switch (type) {
731 case hwmon_temp:
732 switch (attr) {
733 case hwmon_temp_input:
734 case hwmon_temp_min_alarm:
735 case hwmon_temp_max_alarm:
736 case hwmon_temp_crit_alarm:
737 case hwmon_temp_fault:
738 return 0444;
739 case hwmon_temp_min:
740 case hwmon_temp_max:
741 case hwmon_temp_crit:
742 return 0644;
743 default:
744 return 0;
745 }
746 case hwmon_fan:
747 switch (attr) {
748 case hwmon_fan_input:
749 case hwmon_fan_fault:
750 return 0444;
751 case hwmon_fan_pulses:
752 case hwmon_fan_min:
753 case hwmon_fan_max:
754 case hwmon_fan_target:
755 return 0644;
756 default:
757 return 0;
758 }
759 case hwmon_pwm:
760 switch (attr) {
761 case hwmon_pwm_mode:
762 case hwmon_pwm_enable:
763 case hwmon_pwm_input:
764 return 0644;
765 case hwmon_pwm_auto_channels_temp:
766 return 0444;
767 default:
768 return 0;
769 }
770 default:
771 return 0;
772 }
773}
774
775static const struct hwmon_channel_info * const amc6821_info[] = {
776 HWMON_CHANNEL_INFO(temp,
777 HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX |
778 HWMON_T_CRIT | HWMON_T_MIN_ALARM |
779 HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM,
780 HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX |
781 HWMON_T_CRIT | HWMON_T_MIN_ALARM |
782 HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM |
783 HWMON_T_FAULT),
784 HWMON_CHANNEL_INFO(fan,
785 HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX |
786 HWMON_F_TARGET | HWMON_F_PULSES | HWMON_F_FAULT),
787 HWMON_CHANNEL_INFO(pwm,
788 HWMON_PWM_INPUT | HWMON_PWM_ENABLE | HWMON_PWM_MODE |
789 HWMON_PWM_AUTO_CHANNELS_TEMP),
790 NULL
791};
792
793static const struct hwmon_ops amc6821_hwmon_ops = {
794 .is_visible = amc6821_is_visible,
795 .read = amc6821_read,
796 .write = amc6821_write,
797};
798
799static const struct hwmon_chip_info amc6821_chip_info = {
800 .ops = &amc6821_hwmon_ops,
801 .info = amc6821_info,
802};
803
804/* Return 0 if detection is successful, -ENODEV otherwise */
805static int amc6821_detect(struct i2c_client *client, struct i2c_board_info *info)
806{
807 struct i2c_adapter *adapter = client->adapter;
808 int address = client->addr;
809 int dev_id, comp_id;
810
811 dev_dbg(&adapter->dev, "amc6821_detect called.\n");
812
813 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
814 dev_dbg(&adapter->dev,
815 "amc6821: I2C bus doesn't support byte mode, "
816 "skipping.\n");
817 return -ENODEV;
818 }
819
820 dev_id = i2c_smbus_read_byte_data(client, AMC6821_REG_DEV_ID);
821 comp_id = i2c_smbus_read_byte_data(client, AMC6821_REG_COMP_ID);
822 if (dev_id != 0x21 || comp_id != 0x49) {
823 dev_dbg(&adapter->dev,
824 "amc6821: detection failed at 0x%02x.\n",
825 address);
826 return -ENODEV;
827 }
828
829 /*
830 * Bit 7 of the address register is ignored, so we can check the
831 * ID registers again
832 */
833 dev_id = i2c_smbus_read_byte_data(client, 0x80 | AMC6821_REG_DEV_ID);
834 comp_id = i2c_smbus_read_byte_data(client, 0x80 | AMC6821_REG_COMP_ID);
835 if (dev_id != 0x21 || comp_id != 0x49) {
836 dev_dbg(&adapter->dev,
837 "amc6821: detection failed at 0x%02x.\n",
838 address);
839 return -ENODEV;
840 }
841
842 dev_info(&adapter->dev, "amc6821: chip found at 0x%02x.\n", address);
843 strscpy(info->type, "amc6821", I2C_NAME_SIZE);
844
845 return 0;
846}
847
848static int amc6821_init_client(struct amc6821_data *data)
849{
850 struct regmap *regmap = data->regmap;
851 int err;
852
853 if (init) {
854 err = regmap_set_bits(regmap, AMC6821_REG_CONF4, AMC6821_CONF4_MODE);
855 if (err)
856 return err;
857 err = regmap_clear_bits(regmap, AMC6821_REG_CONF3, AMC6821_CONF3_THERM_FAN_EN);
858 if (err)
859 return err;
860 err = regmap_clear_bits(regmap, AMC6821_REG_CONF2,
861 AMC6821_CONF2_RTFIE |
862 AMC6821_CONF2_LTOIE |
863 AMC6821_CONF2_RTOIE);
864 if (err)
865 return err;
866
867 err = regmap_update_bits(regmap, AMC6821_REG_CONF1,
868 AMC6821_CONF1_THERMOVIE | AMC6821_CONF1_FANIE |
869 AMC6821_CONF1_START | AMC6821_CONF1_PWMINV,
870 AMC6821_CONF1_START |
871 (pwminv ? AMC6821_CONF1_PWMINV : 0));
872 if (err)
873 return err;
874 }
875 return 0;
876}
877
878static bool amc6821_volatile_reg(struct device *dev, unsigned int reg)
879{
880 switch (reg) {
881 case AMC6821_REG_STAT1:
882 case AMC6821_REG_STAT2:
883 case AMC6821_REG_TEMP_LO:
884 case AMC6821_REG_TDATA_LOW:
885 case AMC6821_REG_LTEMP_HI:
886 case AMC6821_REG_RTEMP_HI:
887 case AMC6821_REG_TDATA_HI:
888 return true;
889 default:
890 return false;
891 }
892}
893
894static const struct regmap_config amc6821_regmap_config = {
895 .reg_bits = 8,
896 .val_bits = 8,
897 .volatile_reg = amc6821_volatile_reg,
898 .cache_type = REGCACHE_MAPLE,
899};
900
901static int amc6821_probe(struct i2c_client *client)
902{
903 struct device *dev = &client->dev;
904 struct amc6821_data *data;
905 struct device *hwmon_dev;
906 struct regmap *regmap;
907 int err;
908
909 data = devm_kzalloc(dev, sizeof(struct amc6821_data), GFP_KERNEL);
910 if (!data)
911 return -ENOMEM;
912
913 regmap = devm_regmap_init_i2c(client, &amc6821_regmap_config);
914 if (IS_ERR(regmap))
915 return dev_err_probe(dev, PTR_ERR(regmap),
916 "Failed to initialize regmap\n");
917 data->regmap = regmap;
918
919 err = amc6821_init_client(data);
920 if (err)
921 return err;
922
923 if (of_device_is_compatible(dev->of_node, "tsd,mule")) {
924 err = devm_of_platform_populate(dev);
925 if (err)
926 return dev_err_probe(dev, err,
927 "Failed to create sub-devices\n");
928 }
929
930 hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
931 data, &amc6821_chip_info,
932 amc6821_groups);
933 return PTR_ERR_OR_ZERO(hwmon_dev);
934}
935
936static const struct i2c_device_id amc6821_id[] = {
937 { "amc6821" },
938 { }
939};
940
941MODULE_DEVICE_TABLE(i2c, amc6821_id);
942
943static const struct of_device_id __maybe_unused amc6821_of_match[] = {
944 {
945 .compatible = "ti,amc6821",
946 },
947 {
948 .compatible = "tsd,mule",
949 },
950 { }
951};
952
953MODULE_DEVICE_TABLE(of, amc6821_of_match);
954
955static struct i2c_driver amc6821_driver = {
956 .class = I2C_CLASS_HWMON,
957 .driver = {
958 .name = "amc6821",
959 .of_match_table = of_match_ptr(amc6821_of_match),
960 },
961 .probe = amc6821_probe,
962 .id_table = amc6821_id,
963 .detect = amc6821_detect,
964 .address_list = normal_i2c,
965};
966
967module_i2c_driver(amc6821_driver);
968
969MODULE_LICENSE("GPL");
970MODULE_AUTHOR("T. Mertelj <tomaz.mertelj@guest.arnes.si>");
971MODULE_DESCRIPTION("Texas Instruments amc6821 hwmon driver");