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, 0444);
48
49static int init = 1; /*Power-on initialization.*/
50module_param(init, int, 0444);
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 temp_show(struct device *dev, struct device_attribute *devattr,
281 char *buf)
282{
283 struct amc6821_data *data = amc6821_update_device(dev);
284 int ix = to_sensor_dev_attr(devattr)->index;
285
286 return sprintf(buf, "%d\n", data->temp[ix] * 1000);
287}
288
289static ssize_t temp_store(struct device *dev, struct device_attribute *attr,
290 const char *buf, size_t count)
291{
292 struct amc6821_data *data = dev_get_drvdata(dev);
293 struct i2c_client *client = data->client;
294 int ix = to_sensor_dev_attr(attr)->index;
295 long val;
296
297 int ret = kstrtol(buf, 10, &val);
298 if (ret)
299 return ret;
300 val = clamp_val(val / 1000, -128, 127);
301
302 mutex_lock(&data->update_lock);
303 data->temp[ix] = val;
304 if (i2c_smbus_write_byte_data(client, temp_reg[ix], data->temp[ix])) {
305 dev_err(&client->dev, "Register write error, aborting.\n");
306 count = -EIO;
307 }
308 mutex_unlock(&data->update_lock);
309 return count;
310}
311
312static ssize_t temp_alarm_show(struct device *dev,
313 struct device_attribute *devattr, char *buf)
314{
315 struct amc6821_data *data = amc6821_update_device(dev);
316 int ix = to_sensor_dev_attr(devattr)->index;
317 u8 flag;
318
319 switch (ix) {
320 case IDX_TEMP1_MIN:
321 flag = data->stat1 & AMC6821_STAT1_LTL;
322 break;
323 case IDX_TEMP1_MAX:
324 flag = data->stat1 & AMC6821_STAT1_LTH;
325 break;
326 case IDX_TEMP1_CRIT:
327 flag = data->stat2 & AMC6821_STAT2_LTC;
328 break;
329 case IDX_TEMP2_MIN:
330 flag = data->stat1 & AMC6821_STAT1_RTL;
331 break;
332 case IDX_TEMP2_MAX:
333 flag = data->stat1 & AMC6821_STAT1_RTH;
334 break;
335 case IDX_TEMP2_CRIT:
336 flag = data->stat2 & AMC6821_STAT2_RTC;
337 break;
338 default:
339 dev_dbg(dev, "Unknown attr->index (%d).\n", ix);
340 return -EINVAL;
341 }
342 if (flag)
343 return sprintf(buf, "1");
344 else
345 return sprintf(buf, "0");
346}
347
348static ssize_t temp2_fault_show(struct device *dev,
349 struct device_attribute *devattr, char *buf)
350{
351 struct amc6821_data *data = amc6821_update_device(dev);
352 if (data->stat1 & AMC6821_STAT1_RTF)
353 return sprintf(buf, "1");
354 else
355 return sprintf(buf, "0");
356}
357
358static ssize_t pwm1_show(struct device *dev, struct device_attribute *devattr,
359 char *buf)
360{
361 struct amc6821_data *data = amc6821_update_device(dev);
362 return sprintf(buf, "%d\n", data->pwm1);
363}
364
365static ssize_t pwm1_store(struct device *dev,
366 struct device_attribute *devattr, const char *buf,
367 size_t count)
368{
369 struct amc6821_data *data = dev_get_drvdata(dev);
370 struct i2c_client *client = data->client;
371 long val;
372 int ret = kstrtol(buf, 10, &val);
373 if (ret)
374 return ret;
375
376 mutex_lock(&data->update_lock);
377 data->pwm1 = clamp_val(val , 0, 255);
378 i2c_smbus_write_byte_data(client, AMC6821_REG_DCY, data->pwm1);
379 mutex_unlock(&data->update_lock);
380 return count;
381}
382
383static ssize_t pwm1_enable_show(struct device *dev,
384 struct device_attribute *devattr, char *buf)
385{
386 struct amc6821_data *data = amc6821_update_device(dev);
387 return sprintf(buf, "%d\n", data->pwm1_enable);
388}
389
390static ssize_t pwm1_enable_store(struct device *dev,
391 struct device_attribute *attr,
392 const char *buf, size_t count)
393{
394 struct amc6821_data *data = dev_get_drvdata(dev);
395 struct i2c_client *client = data->client;
396 long val;
397 int config = kstrtol(buf, 10, &val);
398 if (config)
399 return config;
400
401 mutex_lock(&data->update_lock);
402 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF1);
403 if (config < 0) {
404 dev_err(&client->dev,
405 "Error reading configuration register, aborting.\n");
406 count = config;
407 goto unlock;
408 }
409
410 switch (val) {
411 case 1:
412 config &= ~AMC6821_CONF1_FDRC0;
413 config &= ~AMC6821_CONF1_FDRC1;
414 break;
415 case 2:
416 config &= ~AMC6821_CONF1_FDRC0;
417 config |= AMC6821_CONF1_FDRC1;
418 break;
419 case 3:
420 config |= AMC6821_CONF1_FDRC0;
421 config |= AMC6821_CONF1_FDRC1;
422 break;
423 default:
424 count = -EINVAL;
425 goto unlock;
426 }
427 if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF1, config)) {
428 dev_err(&client->dev,
429 "Configuration register write error, aborting.\n");
430 count = -EIO;
431 }
432unlock:
433 mutex_unlock(&data->update_lock);
434 return count;
435}
436
437static ssize_t pwm1_auto_channels_temp_show(struct device *dev,
438 struct device_attribute *devattr,
439 char *buf)
440{
441 struct amc6821_data *data = amc6821_update_device(dev);
442 return sprintf(buf, "%d\n", data->pwm1_auto_channels_temp);
443}
444
445static ssize_t temp_auto_point_temp_show(struct device *dev,
446 struct device_attribute *devattr,
447 char *buf)
448{
449 int ix = to_sensor_dev_attr_2(devattr)->index;
450 int nr = to_sensor_dev_attr_2(devattr)->nr;
451 struct amc6821_data *data = amc6821_update_device(dev);
452 switch (nr) {
453 case 1:
454 return sprintf(buf, "%d\n",
455 data->temp1_auto_point_temp[ix] * 1000);
456 case 2:
457 return sprintf(buf, "%d\n",
458 data->temp2_auto_point_temp[ix] * 1000);
459 default:
460 dev_dbg(dev, "Unknown attr->nr (%d).\n", nr);
461 return -EINVAL;
462 }
463}
464
465static ssize_t pwm1_auto_point_pwm_show(struct device *dev,
466 struct device_attribute *devattr,
467 char *buf)
468{
469 int ix = to_sensor_dev_attr(devattr)->index;
470 struct amc6821_data *data = amc6821_update_device(dev);
471 return sprintf(buf, "%d\n", data->pwm1_auto_point_pwm[ix]);
472}
473
474static inline ssize_t set_slope_register(struct i2c_client *client,
475 u8 reg,
476 u8 dpwm,
477 u8 *ptemp)
478{
479 int dt;
480 u8 tmp;
481
482 dt = ptemp[2]-ptemp[1];
483 for (tmp = 4; tmp > 0; tmp--) {
484 if (dt * (0x20 >> tmp) >= dpwm)
485 break;
486 }
487 tmp |= (ptemp[1] & 0x7C) << 1;
488 if (i2c_smbus_write_byte_data(client,
489 reg, tmp)) {
490 dev_err(&client->dev, "Register write error, aborting.\n");
491 return -EIO;
492 }
493 return 0;
494}
495
496static ssize_t temp_auto_point_temp_store(struct device *dev,
497 struct device_attribute *attr,
498 const char *buf, size_t count)
499{
500 struct amc6821_data *data = amc6821_update_device(dev);
501 struct i2c_client *client = data->client;
502 int ix = to_sensor_dev_attr_2(attr)->index;
503 int nr = to_sensor_dev_attr_2(attr)->nr;
504 u8 *ptemp;
505 u8 reg;
506 int dpwm;
507 long val;
508 int ret = kstrtol(buf, 10, &val);
509 if (ret)
510 return ret;
511
512 switch (nr) {
513 case 1:
514 ptemp = data->temp1_auto_point_temp;
515 reg = AMC6821_REG_LTEMP_FAN_CTRL;
516 break;
517 case 2:
518 ptemp = data->temp2_auto_point_temp;
519 reg = AMC6821_REG_RTEMP_FAN_CTRL;
520 break;
521 default:
522 dev_dbg(dev, "Unknown attr->nr (%d).\n", nr);
523 return -EINVAL;
524 }
525
526 mutex_lock(&data->update_lock);
527 data->valid = 0;
528
529 switch (ix) {
530 case 0:
531 ptemp[0] = clamp_val(val / 1000, 0,
532 data->temp1_auto_point_temp[1]);
533 ptemp[0] = clamp_val(ptemp[0], 0,
534 data->temp2_auto_point_temp[1]);
535 ptemp[0] = clamp_val(ptemp[0], 0, 63);
536 if (i2c_smbus_write_byte_data(
537 client,
538 AMC6821_REG_PSV_TEMP,
539 ptemp[0])) {
540 dev_err(&client->dev,
541 "Register write error, aborting.\n");
542 count = -EIO;
543 }
544 goto EXIT;
545 case 1:
546 ptemp[1] = clamp_val(val / 1000, (ptemp[0] & 0x7C) + 4, 124);
547 ptemp[1] &= 0x7C;
548 ptemp[2] = clamp_val(ptemp[2], ptemp[1] + 1, 255);
549 break;
550 case 2:
551 ptemp[2] = clamp_val(val / 1000, ptemp[1]+1, 255);
552 break;
553 default:
554 dev_dbg(dev, "Unknown attr->index (%d).\n", ix);
555 count = -EINVAL;
556 goto EXIT;
557 }
558 dpwm = data->pwm1_auto_point_pwm[2] - data->pwm1_auto_point_pwm[1];
559 if (set_slope_register(client, reg, dpwm, ptemp))
560 count = -EIO;
561
562EXIT:
563 mutex_unlock(&data->update_lock);
564 return count;
565}
566
567static ssize_t pwm1_auto_point_pwm_store(struct device *dev,
568 struct device_attribute *attr,
569 const char *buf, size_t count)
570{
571 struct amc6821_data *data = dev_get_drvdata(dev);
572 struct i2c_client *client = data->client;
573 int dpwm;
574 long val;
575 int ret = kstrtol(buf, 10, &val);
576 if (ret)
577 return ret;
578
579 mutex_lock(&data->update_lock);
580 data->pwm1_auto_point_pwm[1] = clamp_val(val, 0, 254);
581 if (i2c_smbus_write_byte_data(client, AMC6821_REG_DCY_LOW_TEMP,
582 data->pwm1_auto_point_pwm[1])) {
583 dev_err(&client->dev, "Register write error, aborting.\n");
584 count = -EIO;
585 goto EXIT;
586 }
587 dpwm = data->pwm1_auto_point_pwm[2] - data->pwm1_auto_point_pwm[1];
588 if (set_slope_register(client, AMC6821_REG_LTEMP_FAN_CTRL, dpwm,
589 data->temp1_auto_point_temp)) {
590 count = -EIO;
591 goto EXIT;
592 }
593 if (set_slope_register(client, AMC6821_REG_RTEMP_FAN_CTRL, dpwm,
594 data->temp2_auto_point_temp)) {
595 count = -EIO;
596 goto EXIT;
597 }
598
599EXIT:
600 data->valid = 0;
601 mutex_unlock(&data->update_lock);
602 return count;
603}
604
605static ssize_t fan_show(struct device *dev, struct device_attribute *devattr,
606 char *buf)
607{
608 struct amc6821_data *data = amc6821_update_device(dev);
609 int ix = to_sensor_dev_attr(devattr)->index;
610 if (0 == data->fan[ix])
611 return sprintf(buf, "0");
612 return sprintf(buf, "%d\n", (int)(6000000 / data->fan[ix]));
613}
614
615static ssize_t fan1_fault_show(struct device *dev,
616 struct device_attribute *devattr, char *buf)
617{
618 struct amc6821_data *data = amc6821_update_device(dev);
619 if (data->stat1 & AMC6821_STAT1_FANS)
620 return sprintf(buf, "1");
621 else
622 return sprintf(buf, "0");
623}
624
625static ssize_t fan_store(struct device *dev, struct device_attribute *attr,
626 const char *buf, size_t count)
627{
628 struct amc6821_data *data = dev_get_drvdata(dev);
629 struct i2c_client *client = data->client;
630 long val;
631 int ix = to_sensor_dev_attr(attr)->index;
632 int ret = kstrtol(buf, 10, &val);
633 if (ret)
634 return ret;
635 val = 1 > val ? 0xFFFF : 6000000/val;
636
637 mutex_lock(&data->update_lock);
638 data->fan[ix] = (u16) clamp_val(val, 1, 0xFFFF);
639 if (i2c_smbus_write_byte_data(client, fan_reg_low[ix],
640 data->fan[ix] & 0xFF)) {
641 dev_err(&client->dev, "Register write error, aborting.\n");
642 count = -EIO;
643 goto EXIT;
644 }
645 if (i2c_smbus_write_byte_data(client,
646 fan_reg_hi[ix], data->fan[ix] >> 8)) {
647 dev_err(&client->dev, "Register write error, aborting.\n");
648 count = -EIO;
649 }
650EXIT:
651 mutex_unlock(&data->update_lock);
652 return count;
653}
654
655static ssize_t fan1_div_show(struct device *dev,
656 struct device_attribute *devattr, char *buf)
657{
658 struct amc6821_data *data = amc6821_update_device(dev);
659 return sprintf(buf, "%d\n", data->fan1_div);
660}
661
662static ssize_t fan1_div_store(struct device *dev,
663 struct device_attribute *attr, const char *buf,
664 size_t count)
665{
666 struct amc6821_data *data = dev_get_drvdata(dev);
667 struct i2c_client *client = data->client;
668 long val;
669 int config = kstrtol(buf, 10, &val);
670 if (config)
671 return config;
672
673 mutex_lock(&data->update_lock);
674 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF4);
675 if (config < 0) {
676 dev_err(&client->dev,
677 "Error reading configuration register, aborting.\n");
678 count = config;
679 goto EXIT;
680 }
681 switch (val) {
682 case 2:
683 config &= ~AMC6821_CONF4_PSPR;
684 data->fan1_div = 2;
685 break;
686 case 4:
687 config |= AMC6821_CONF4_PSPR;
688 data->fan1_div = 4;
689 break;
690 default:
691 count = -EINVAL;
692 goto EXIT;
693 }
694 if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF4, config)) {
695 dev_err(&client->dev,
696 "Configuration register write error, aborting.\n");
697 count = -EIO;
698 }
699EXIT:
700 mutex_unlock(&data->update_lock);
701 return count;
702}
703
704static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, IDX_TEMP1_INPUT);
705static SENSOR_DEVICE_ATTR_RW(temp1_min, temp, IDX_TEMP1_MIN);
706static SENSOR_DEVICE_ATTR_RW(temp1_max, temp, IDX_TEMP1_MAX);
707static SENSOR_DEVICE_ATTR_RW(temp1_crit, temp, IDX_TEMP1_CRIT);
708static SENSOR_DEVICE_ATTR_RO(temp1_min_alarm, temp_alarm, IDX_TEMP1_MIN);
709static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, temp_alarm, IDX_TEMP1_MAX);
710static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, temp_alarm, IDX_TEMP1_CRIT);
711static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, IDX_TEMP2_INPUT);
712static SENSOR_DEVICE_ATTR_RW(temp2_min, temp, IDX_TEMP2_MIN);
713static SENSOR_DEVICE_ATTR_RW(temp2_max, temp, IDX_TEMP2_MAX);
714static SENSOR_DEVICE_ATTR_RW(temp2_crit, temp, IDX_TEMP2_CRIT);
715static SENSOR_DEVICE_ATTR_RO(temp2_fault, temp2_fault, 0);
716static SENSOR_DEVICE_ATTR_RO(temp2_min_alarm, temp_alarm, IDX_TEMP2_MIN);
717static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, temp_alarm, IDX_TEMP2_MAX);
718static SENSOR_DEVICE_ATTR_RO(temp2_crit_alarm, temp_alarm, IDX_TEMP2_CRIT);
719static SENSOR_DEVICE_ATTR_RO(fan1_input, fan, IDX_FAN1_INPUT);
720static SENSOR_DEVICE_ATTR_RW(fan1_min, fan, IDX_FAN1_MIN);
721static SENSOR_DEVICE_ATTR_RW(fan1_max, fan, IDX_FAN1_MAX);
722static SENSOR_DEVICE_ATTR_RO(fan1_fault, fan1_fault, 0);
723static SENSOR_DEVICE_ATTR_RW(fan1_div, fan1_div, 0);
724
725static SENSOR_DEVICE_ATTR_RW(pwm1, pwm1, 0);
726static SENSOR_DEVICE_ATTR_RW(pwm1_enable, pwm1_enable, 0);
727static SENSOR_DEVICE_ATTR_RO(pwm1_auto_point1_pwm, pwm1_auto_point_pwm, 0);
728static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point2_pwm, pwm1_auto_point_pwm, 1);
729static SENSOR_DEVICE_ATTR_RO(pwm1_auto_point3_pwm, pwm1_auto_point_pwm, 2);
730static SENSOR_DEVICE_ATTR_RO(pwm1_auto_channels_temp, pwm1_auto_channels_temp,
731 0);
732static SENSOR_DEVICE_ATTR_2_RO(temp1_auto_point1_temp, temp_auto_point_temp,
733 1, 0);
734static SENSOR_DEVICE_ATTR_2_RW(temp1_auto_point2_temp, temp_auto_point_temp,
735 1, 1);
736static SENSOR_DEVICE_ATTR_2_RW(temp1_auto_point3_temp, temp_auto_point_temp,
737 1, 2);
738
739static SENSOR_DEVICE_ATTR_2_RW(temp2_auto_point1_temp, temp_auto_point_temp,
740 2, 0);
741static SENSOR_DEVICE_ATTR_2_RW(temp2_auto_point2_temp, temp_auto_point_temp,
742 2, 1);
743static SENSOR_DEVICE_ATTR_2_RW(temp2_auto_point3_temp, temp_auto_point_temp,
744 2, 2);
745
746static struct attribute *amc6821_attrs[] = {
747 &sensor_dev_attr_temp1_input.dev_attr.attr,
748 &sensor_dev_attr_temp1_min.dev_attr.attr,
749 &sensor_dev_attr_temp1_max.dev_attr.attr,
750 &sensor_dev_attr_temp1_crit.dev_attr.attr,
751 &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
752 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
753 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
754 &sensor_dev_attr_temp2_input.dev_attr.attr,
755 &sensor_dev_attr_temp2_min.dev_attr.attr,
756 &sensor_dev_attr_temp2_max.dev_attr.attr,
757 &sensor_dev_attr_temp2_crit.dev_attr.attr,
758 &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
759 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
760 &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
761 &sensor_dev_attr_temp2_fault.dev_attr.attr,
762 &sensor_dev_attr_fan1_input.dev_attr.attr,
763 &sensor_dev_attr_fan1_min.dev_attr.attr,
764 &sensor_dev_attr_fan1_max.dev_attr.attr,
765 &sensor_dev_attr_fan1_fault.dev_attr.attr,
766 &sensor_dev_attr_fan1_div.dev_attr.attr,
767 &sensor_dev_attr_pwm1.dev_attr.attr,
768 &sensor_dev_attr_pwm1_enable.dev_attr.attr,
769 &sensor_dev_attr_pwm1_auto_channels_temp.dev_attr.attr,
770 &sensor_dev_attr_pwm1_auto_point1_pwm.dev_attr.attr,
771 &sensor_dev_attr_pwm1_auto_point2_pwm.dev_attr.attr,
772 &sensor_dev_attr_pwm1_auto_point3_pwm.dev_attr.attr,
773 &sensor_dev_attr_temp1_auto_point1_temp.dev_attr.attr,
774 &sensor_dev_attr_temp1_auto_point2_temp.dev_attr.attr,
775 &sensor_dev_attr_temp1_auto_point3_temp.dev_attr.attr,
776 &sensor_dev_attr_temp2_auto_point1_temp.dev_attr.attr,
777 &sensor_dev_attr_temp2_auto_point2_temp.dev_attr.attr,
778 &sensor_dev_attr_temp2_auto_point3_temp.dev_attr.attr,
779 NULL
780};
781
782ATTRIBUTE_GROUPS(amc6821);
783
784/* Return 0 if detection is successful, -ENODEV otherwise */
785static int amc6821_detect(
786 struct i2c_client *client,
787 struct i2c_board_info *info)
788{
789 struct i2c_adapter *adapter = client->adapter;
790 int address = client->addr;
791 int dev_id, comp_id;
792
793 dev_dbg(&adapter->dev, "amc6821_detect called.\n");
794
795 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
796 dev_dbg(&adapter->dev,
797 "amc6821: I2C bus doesn't support byte mode, "
798 "skipping.\n");
799 return -ENODEV;
800 }
801
802 dev_id = i2c_smbus_read_byte_data(client, AMC6821_REG_DEV_ID);
803 comp_id = i2c_smbus_read_byte_data(client, 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 /*
812 * Bit 7 of the address register is ignored, so we can check the
813 * ID registers again
814 */
815 dev_id = i2c_smbus_read_byte_data(client, 0x80 | AMC6821_REG_DEV_ID);
816 comp_id = i2c_smbus_read_byte_data(client, 0x80 | AMC6821_REG_COMP_ID);
817 if (dev_id != 0x21 || comp_id != 0x49) {
818 dev_dbg(&adapter->dev,
819 "amc6821: detection failed at 0x%02x.\n",
820 address);
821 return -ENODEV;
822 }
823
824 dev_info(&adapter->dev, "amc6821: chip found at 0x%02x.\n", address);
825 strlcpy(info->type, "amc6821", I2C_NAME_SIZE);
826
827 return 0;
828}
829
830static int amc6821_init_client(struct i2c_client *client)
831{
832 int config;
833 int err = -EIO;
834
835 if (init) {
836 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF4);
837
838 if (config < 0) {
839 dev_err(&client->dev,
840 "Error reading configuration register, aborting.\n");
841 return err;
842 }
843
844 config |= AMC6821_CONF4_MODE;
845
846 if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF4,
847 config)) {
848 dev_err(&client->dev,
849 "Configuration register write error, aborting.\n");
850 return err;
851 }
852
853 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF3);
854
855 if (config < 0) {
856 dev_err(&client->dev,
857 "Error reading configuration register, aborting.\n");
858 return err;
859 }
860
861 dev_info(&client->dev, "Revision %d\n", config & 0x0f);
862
863 config &= ~AMC6821_CONF3_THERM_FAN_EN;
864
865 if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF3,
866 config)) {
867 dev_err(&client->dev,
868 "Configuration register write error, aborting.\n");
869 return err;
870 }
871
872 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF2);
873
874 if (config < 0) {
875 dev_err(&client->dev,
876 "Error reading configuration register, aborting.\n");
877 return err;
878 }
879
880 config &= ~AMC6821_CONF2_RTFIE;
881 config &= ~AMC6821_CONF2_LTOIE;
882 config &= ~AMC6821_CONF2_RTOIE;
883 if (i2c_smbus_write_byte_data(client,
884 AMC6821_REG_CONF2, config)) {
885 dev_err(&client->dev,
886 "Configuration register write error, aborting.\n");
887 return err;
888 }
889
890 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF1);
891
892 if (config < 0) {
893 dev_err(&client->dev,
894 "Error reading configuration register, aborting.\n");
895 return err;
896 }
897
898 config &= ~AMC6821_CONF1_THERMOVIE;
899 config &= ~AMC6821_CONF1_FANIE;
900 config |= AMC6821_CONF1_START;
901 if (pwminv)
902 config |= AMC6821_CONF1_PWMINV;
903 else
904 config &= ~AMC6821_CONF1_PWMINV;
905
906 if (i2c_smbus_write_byte_data(
907 client, AMC6821_REG_CONF1, config)) {
908 dev_err(&client->dev,
909 "Configuration register write error, aborting.\n");
910 return err;
911 }
912 }
913 return 0;
914}
915
916static int amc6821_probe(struct i2c_client *client,
917 const struct i2c_device_id *id)
918{
919 struct device *dev = &client->dev;
920 struct amc6821_data *data;
921 struct device *hwmon_dev;
922 int err;
923
924 data = devm_kzalloc(dev, sizeof(struct amc6821_data), GFP_KERNEL);
925 if (!data)
926 return -ENOMEM;
927
928 data->client = client;
929 mutex_init(&data->update_lock);
930
931 /*
932 * Initialize the amc6821 chip
933 */
934 err = amc6821_init_client(client);
935 if (err)
936 return err;
937
938 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
939 data,
940 amc6821_groups);
941 return PTR_ERR_OR_ZERO(hwmon_dev);
942}
943
944static const struct i2c_device_id amc6821_id[] = {
945 { "amc6821", amc6821 },
946 { }
947};
948
949MODULE_DEVICE_TABLE(i2c, amc6821_id);
950
951static struct i2c_driver amc6821_driver = {
952 .class = I2C_CLASS_HWMON,
953 .driver = {
954 .name = "amc6821",
955 },
956 .probe = amc6821_probe,
957 .id_table = amc6821_id,
958 .detect = amc6821_detect,
959 .address_list = normal_i2c,
960};
961
962module_i2c_driver(amc6821_driver);
963
964MODULE_LICENSE("GPL");
965MODULE_AUTHOR("T. Mertelj <tomaz.mertelj@guest.arnes.si>");
966MODULE_DESCRIPTION("Texas Instruments amc6821 hwmon driver");
967