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
41 static 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
50 static int pwminv; /*Inverted PWM output. */
51 module_param(pwminv, int, S_IRUGO);
52
53 static int init = 1; /*Power-on initialization.*/
54 module_param(init, int, S_IRUGO);
55
56
57 enum 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
129 enum {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
134 static 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
143 enum {IDX_FAN1_INPUT = 0, IDX_FAN1_MIN, IDX_FAN1_MAX,
144 FAN1_IDX_LEN, };
145
146 static const u8 fan_reg_low[] = {AMC6821_REG_TDATA_LOW,
147 AMC6821_REG_TACH_LLIMITL,
148 AMC6821_REG_TACH_HLIMITL, };
149
150
151 static const u8 fan_reg_hi[] = {AMC6821_REG_TDATA_HI,
152 AMC6821_REG_TACH_LLIMITH,
153 AMC6821_REG_TACH_HLIMITH, };
154
155 static int amc6821_probe(
156 struct i2c_client *client,
157 const struct i2c_device_id *id);
158 static int amc6821_detect(
159 struct i2c_client *client,
160 struct i2c_board_info *info);
161 static int amc6821_init_client(struct i2c_client *client);
162 static int amc6821_remove(struct i2c_client *client);
163 static struct amc6821_data *amc6821_update_device(struct device *dev);
164
165 /*
166 * Driver data (common to all clients)
167 */
168
169 static const struct i2c_device_id amc6821_id[] = {
170 { "amc6821", amc6821 },
171 { }
172 };
173
174 MODULE_DEVICE_TABLE(i2c, amc6821_id);
175
176 static 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
193 struct 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
get_temp(struct device * dev,struct device_attribute * devattr,char * buf)217 static 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
set_temp(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)230 static ssize_t set_temp(
231 struct device *dev,
232 struct device_attribute *attr,
233 const char *buf,
234 size_t count)
235 {
236 struct i2c_client *client = to_i2c_client(dev);
237 struct amc6821_data *data = i2c_get_clientdata(client);
238 int ix = to_sensor_dev_attr(attr)->index;
239 long val;
240
241 int ret = kstrtol(buf, 10, &val);
242 if (ret)
243 return ret;
244 val = clamp_val(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
get_temp_alarm(struct device * dev,struct device_attribute * devattr,char * buf)259 static 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
get_temp2_fault(struct device * dev,struct device_attribute * devattr,char * buf)300 static 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
get_pwm1(struct device * dev,struct device_attribute * devattr,char * buf)312 static 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
set_pwm1(struct device * dev,struct device_attribute * devattr,const char * buf,size_t count)321 static ssize_t set_pwm1(
322 struct device *dev,
323 struct device_attribute *devattr,
324 const char *buf,
325 size_t count)
326 {
327 struct i2c_client *client = to_i2c_client(dev);
328 struct amc6821_data *data = i2c_get_clientdata(client);
329 long val;
330 int ret = kstrtol(buf, 10, &val);
331 if (ret)
332 return ret;
333
334 mutex_lock(&data->update_lock);
335 data->pwm1 = clamp_val(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
get_pwm1_enable(struct device * dev,struct device_attribute * devattr,char * buf)341 static 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
set_pwm1_enable(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)350 static ssize_t set_pwm1_enable(
351 struct device *dev,
352 struct device_attribute *attr,
353 const char *buf,
354 size_t count)
355 {
356 struct i2c_client *client = to_i2c_client(dev);
357 struct amc6821_data *data = i2c_get_clientdata(client);
358 long val;
359 int config = kstrtol(buf, 10, &val);
360 if (config)
361 return config;
362
363 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF1);
364 if (config < 0) {
365 dev_err(&client->dev,
366 "Error reading configuration register, aborting.\n");
367 return -EIO;
368 }
369
370 switch (val) {
371 case 1:
372 config &= ~AMC6821_CONF1_FDRC0;
373 config &= ~AMC6821_CONF1_FDRC1;
374 break;
375 case 2:
376 config &= ~AMC6821_CONF1_FDRC0;
377 config |= AMC6821_CONF1_FDRC1;
378 break;
379 case 3:
380 config |= AMC6821_CONF1_FDRC0;
381 config |= AMC6821_CONF1_FDRC1;
382 break;
383 default:
384 return -EINVAL;
385 }
386 mutex_lock(&data->update_lock);
387 if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF1, config)) {
388 dev_err(&client->dev,
389 "Configuration register write error, aborting.\n");
390 count = -EIO;
391 }
392 mutex_unlock(&data->update_lock);
393 return count;
394 }
395
396
get_pwm1_auto_channels_temp(struct device * dev,struct device_attribute * devattr,char * buf)397 static 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
get_temp_auto_point_temp(struct device * dev,struct device_attribute * devattr,char * buf)407 static 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
get_pwm1_auto_point_pwm(struct device * dev,struct device_attribute * devattr,char * buf)431 static 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
set_slope_register(struct i2c_client * client,u8 reg,u8 dpwm,u8 * ptemp)442 static 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
set_temp_auto_point_temp(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)466 static ssize_t set_temp_auto_point_temp(
467 struct device *dev,
468 struct device_attribute *attr,
469 const char *buf,
470 size_t count)
471 {
472 struct i2c_client *client = to_i2c_client(dev);
473 struct amc6821_data *data = amc6821_update_device(dev);
474 int ix = to_sensor_dev_attr_2(attr)->index;
475 int nr = to_sensor_dev_attr_2(attr)->nr;
476 u8 *ptemp;
477 u8 reg;
478 int dpwm;
479 long val;
480 int ret = kstrtol(buf, 10, &val);
481 if (ret)
482 return ret;
483
484 switch (nr) {
485 case 1:
486 ptemp = data->temp1_auto_point_temp;
487 reg = AMC6821_REG_LTEMP_FAN_CTRL;
488 break;
489 case 2:
490 ptemp = data->temp2_auto_point_temp;
491 reg = AMC6821_REG_RTEMP_FAN_CTRL;
492 break;
493 default:
494 dev_dbg(dev, "Unknown attr->nr (%d).\n", nr);
495 return -EINVAL;
496 }
497
498 data->valid = 0;
499 mutex_lock(&data->update_lock);
500 switch (ix) {
501 case 0:
502 ptemp[0] = clamp_val(val / 1000, 0,
503 data->temp1_auto_point_temp[1]);
504 ptemp[0] = clamp_val(ptemp[0], 0,
505 data->temp2_auto_point_temp[1]);
506 ptemp[0] = clamp_val(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] = clamp_val(val / 1000, (ptemp[0] & 0x7C) + 4, 124);
519 ptemp[1] &= 0x7C;
520 ptemp[2] = clamp_val(ptemp[2], ptemp[1] + 1, 255);
521 break;
522 case 2:
523 ptemp[2] = clamp_val(val / 1000, ptemp[1]+1, 255);
524 break;
525 default:
526 dev_dbg(dev, "Unknown attr->index (%d).\n", ix);
527 count = -EINVAL;
528 goto EXIT;
529 }
530 dpwm = data->pwm1_auto_point_pwm[2] - data->pwm1_auto_point_pwm[1];
531 if (set_slope_register(client, reg, dpwm, ptemp))
532 count = -EIO;
533
534 EXIT:
535 mutex_unlock(&data->update_lock);
536 return count;
537 }
538
539
540
set_pwm1_auto_point_pwm(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)541 static ssize_t set_pwm1_auto_point_pwm(
542 struct device *dev,
543 struct device_attribute *attr,
544 const char *buf,
545 size_t count)
546 {
547 struct i2c_client *client = to_i2c_client(dev);
548 struct amc6821_data *data = i2c_get_clientdata(client);
549 int dpwm;
550 long val;
551 int ret = kstrtol(buf, 10, &val);
552 if (ret)
553 return ret;
554
555 mutex_lock(&data->update_lock);
556 data->pwm1_auto_point_pwm[1] = clamp_val(val, 0, 254);
557 if (i2c_smbus_write_byte_data(client, AMC6821_REG_DCY_LOW_TEMP,
558 data->pwm1_auto_point_pwm[1])) {
559 dev_err(&client->dev, "Register write error, aborting.\n");
560 count = -EIO;
561 goto EXIT;
562 }
563 dpwm = data->pwm1_auto_point_pwm[2] - data->pwm1_auto_point_pwm[1];
564 if (set_slope_register(client, AMC6821_REG_LTEMP_FAN_CTRL, dpwm,
565 data->temp1_auto_point_temp)) {
566 count = -EIO;
567 goto EXIT;
568 }
569 if (set_slope_register(client, AMC6821_REG_RTEMP_FAN_CTRL, dpwm,
570 data->temp2_auto_point_temp)) {
571 count = -EIO;
572 goto EXIT;
573 }
574
575 EXIT:
576 data->valid = 0;
577 mutex_unlock(&data->update_lock);
578 return count;
579 }
580
get_fan(struct device * dev,struct device_attribute * devattr,char * buf)581 static ssize_t get_fan(
582 struct device *dev,
583 struct device_attribute *devattr,
584 char *buf)
585 {
586 struct amc6821_data *data = amc6821_update_device(dev);
587 int ix = to_sensor_dev_attr(devattr)->index;
588 if (0 == data->fan[ix])
589 return sprintf(buf, "0");
590 return sprintf(buf, "%d\n", (int)(6000000 / data->fan[ix]));
591 }
592
593
594
get_fan1_fault(struct device * dev,struct device_attribute * devattr,char * buf)595 static ssize_t get_fan1_fault(
596 struct device *dev,
597 struct device_attribute *devattr,
598 char *buf)
599 {
600 struct amc6821_data *data = amc6821_update_device(dev);
601 if (data->stat1 & AMC6821_STAT1_FANS)
602 return sprintf(buf, "1");
603 else
604 return sprintf(buf, "0");
605 }
606
607
608
set_fan(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)609 static ssize_t set_fan(
610 struct device *dev,
611 struct device_attribute *attr,
612 const char *buf, size_t count)
613 {
614 struct i2c_client *client = to_i2c_client(dev);
615 struct amc6821_data *data = i2c_get_clientdata(client);
616 long val;
617 int ix = to_sensor_dev_attr(attr)->index;
618 int ret = kstrtol(buf, 10, &val);
619 if (ret)
620 return ret;
621 val = 1 > val ? 0xFFFF : 6000000/val;
622
623 mutex_lock(&data->update_lock);
624 data->fan[ix] = (u16) clamp_val(val, 1, 0xFFFF);
625 if (i2c_smbus_write_byte_data(client, fan_reg_low[ix],
626 data->fan[ix] & 0xFF)) {
627 dev_err(&client->dev, "Register write error, aborting.\n");
628 count = -EIO;
629 goto EXIT;
630 }
631 if (i2c_smbus_write_byte_data(client,
632 fan_reg_hi[ix], data->fan[ix] >> 8)) {
633 dev_err(&client->dev, "Register write error, aborting.\n");
634 count = -EIO;
635 }
636 EXIT:
637 mutex_unlock(&data->update_lock);
638 return count;
639 }
640
641
642
get_fan1_div(struct device * dev,struct device_attribute * devattr,char * buf)643 static ssize_t get_fan1_div(
644 struct device *dev,
645 struct device_attribute *devattr,
646 char *buf)
647 {
648 struct amc6821_data *data = amc6821_update_device(dev);
649 return sprintf(buf, "%d\n", data->fan1_div);
650 }
651
set_fan1_div(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)652 static ssize_t set_fan1_div(
653 struct device *dev,
654 struct device_attribute *attr,
655 const char *buf, size_t count)
656 {
657 struct i2c_client *client = to_i2c_client(dev);
658 struct amc6821_data *data = i2c_get_clientdata(client);
659 long val;
660 int config = kstrtol(buf, 10, &val);
661 if (config)
662 return config;
663
664 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF4);
665 if (config < 0) {
666 dev_err(&client->dev,
667 "Error reading configuration register, aborting.\n");
668 return -EIO;
669 }
670 mutex_lock(&data->update_lock);
671 switch (val) {
672 case 2:
673 config &= ~AMC6821_CONF4_PSPR;
674 data->fan1_div = 2;
675 break;
676 case 4:
677 config |= AMC6821_CONF4_PSPR;
678 data->fan1_div = 4;
679 break;
680 default:
681 count = -EINVAL;
682 goto EXIT;
683 }
684 if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF4, config)) {
685 dev_err(&client->dev,
686 "Configuration register write error, aborting.\n");
687 count = -EIO;
688 }
689 EXIT:
690 mutex_unlock(&data->update_lock);
691 return count;
692 }
693
694
695
696 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO,
697 get_temp, NULL, IDX_TEMP1_INPUT);
698 static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO | S_IWUSR, get_temp,
699 set_temp, IDX_TEMP1_MIN);
700 static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR, get_temp,
701 set_temp, IDX_TEMP1_MAX);
702 static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO | S_IWUSR, get_temp,
703 set_temp, IDX_TEMP1_CRIT);
704 static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO,
705 get_temp_alarm, NULL, IDX_TEMP1_MIN);
706 static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO,
707 get_temp_alarm, NULL, IDX_TEMP1_MAX);
708 static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO,
709 get_temp_alarm, NULL, IDX_TEMP1_CRIT);
710 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO | S_IWUSR,
711 get_temp, NULL, IDX_TEMP2_INPUT);
712 static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO | S_IWUSR, get_temp,
713 set_temp, IDX_TEMP2_MIN);
714 static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO | S_IWUSR, get_temp,
715 set_temp, IDX_TEMP2_MAX);
716 static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO | S_IWUSR, get_temp,
717 set_temp, IDX_TEMP2_CRIT);
718 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO,
719 get_temp2_fault, NULL, 0);
720 static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO,
721 get_temp_alarm, NULL, IDX_TEMP2_MIN);
722 static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO,
723 get_temp_alarm, NULL, IDX_TEMP2_MAX);
724 static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO,
725 get_temp_alarm, NULL, IDX_TEMP2_CRIT);
726 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, get_fan, NULL, IDX_FAN1_INPUT);
727 static SENSOR_DEVICE_ATTR(fan1_min, S_IRUGO | S_IWUSR,
728 get_fan, set_fan, IDX_FAN1_MIN);
729 static SENSOR_DEVICE_ATTR(fan1_max, S_IRUGO | S_IWUSR,
730 get_fan, set_fan, IDX_FAN1_MAX);
731 static SENSOR_DEVICE_ATTR(fan1_fault, S_IRUGO, get_fan1_fault, NULL, 0);
732 static SENSOR_DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR,
733 get_fan1_div, set_fan1_div, 0);
734
735 static SENSOR_DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, get_pwm1, set_pwm1, 0);
736 static SENSOR_DEVICE_ATTR(pwm1_enable, S_IWUSR | S_IRUGO,
737 get_pwm1_enable, set_pwm1_enable, 0);
738 static SENSOR_DEVICE_ATTR(pwm1_auto_point1_pwm, S_IRUGO,
739 get_pwm1_auto_point_pwm, NULL, 0);
740 static SENSOR_DEVICE_ATTR(pwm1_auto_point2_pwm, S_IWUSR | S_IRUGO,
741 get_pwm1_auto_point_pwm, set_pwm1_auto_point_pwm, 1);
742 static SENSOR_DEVICE_ATTR(pwm1_auto_point3_pwm, S_IRUGO,
743 get_pwm1_auto_point_pwm, NULL, 2);
744 static SENSOR_DEVICE_ATTR(pwm1_auto_channels_temp, S_IRUGO,
745 get_pwm1_auto_channels_temp, NULL, 0);
746 static SENSOR_DEVICE_ATTR_2(temp1_auto_point1_temp, S_IRUGO,
747 get_temp_auto_point_temp, NULL, 1, 0);
748 static SENSOR_DEVICE_ATTR_2(temp1_auto_point2_temp, S_IWUSR | S_IRUGO,
749 get_temp_auto_point_temp, set_temp_auto_point_temp, 1, 1);
750 static SENSOR_DEVICE_ATTR_2(temp1_auto_point3_temp, S_IWUSR | S_IRUGO,
751 get_temp_auto_point_temp, set_temp_auto_point_temp, 1, 2);
752
753 static SENSOR_DEVICE_ATTR_2(temp2_auto_point1_temp, S_IWUSR | S_IRUGO,
754 get_temp_auto_point_temp, set_temp_auto_point_temp, 2, 0);
755 static SENSOR_DEVICE_ATTR_2(temp2_auto_point2_temp, S_IWUSR | S_IRUGO,
756 get_temp_auto_point_temp, set_temp_auto_point_temp, 2, 1);
757 static SENSOR_DEVICE_ATTR_2(temp2_auto_point3_temp, S_IWUSR | S_IRUGO,
758 get_temp_auto_point_temp, set_temp_auto_point_temp, 2, 2);
759
760
761
762 static struct attribute *amc6821_attrs[] = {
763 &sensor_dev_attr_temp1_input.dev_attr.attr,
764 &sensor_dev_attr_temp1_min.dev_attr.attr,
765 &sensor_dev_attr_temp1_max.dev_attr.attr,
766 &sensor_dev_attr_temp1_crit.dev_attr.attr,
767 &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
768 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
769 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
770 &sensor_dev_attr_temp2_input.dev_attr.attr,
771 &sensor_dev_attr_temp2_min.dev_attr.attr,
772 &sensor_dev_attr_temp2_max.dev_attr.attr,
773 &sensor_dev_attr_temp2_crit.dev_attr.attr,
774 &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
775 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
776 &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
777 &sensor_dev_attr_temp2_fault.dev_attr.attr,
778 &sensor_dev_attr_fan1_input.dev_attr.attr,
779 &sensor_dev_attr_fan1_min.dev_attr.attr,
780 &sensor_dev_attr_fan1_max.dev_attr.attr,
781 &sensor_dev_attr_fan1_fault.dev_attr.attr,
782 &sensor_dev_attr_fan1_div.dev_attr.attr,
783 &sensor_dev_attr_pwm1.dev_attr.attr,
784 &sensor_dev_attr_pwm1_enable.dev_attr.attr,
785 &sensor_dev_attr_pwm1_auto_channels_temp.dev_attr.attr,
786 &sensor_dev_attr_pwm1_auto_point1_pwm.dev_attr.attr,
787 &sensor_dev_attr_pwm1_auto_point2_pwm.dev_attr.attr,
788 &sensor_dev_attr_pwm1_auto_point3_pwm.dev_attr.attr,
789 &sensor_dev_attr_temp1_auto_point1_temp.dev_attr.attr,
790 &sensor_dev_attr_temp1_auto_point2_temp.dev_attr.attr,
791 &sensor_dev_attr_temp1_auto_point3_temp.dev_attr.attr,
792 &sensor_dev_attr_temp2_auto_point1_temp.dev_attr.attr,
793 &sensor_dev_attr_temp2_auto_point2_temp.dev_attr.attr,
794 &sensor_dev_attr_temp2_auto_point3_temp.dev_attr.attr,
795 NULL
796 };
797
798 static struct attribute_group amc6821_attr_grp = {
799 .attrs = amc6821_attrs,
800 };
801
802
803
804 /* Return 0 if detection is successful, -ENODEV otherwise */
amc6821_detect(struct i2c_client * client,struct i2c_board_info * info)805 static int amc6821_detect(
806 struct i2c_client *client,
807 struct i2c_board_info *info)
808 {
809 struct i2c_adapter *adapter = client->adapter;
810 int address = client->addr;
811 int dev_id, comp_id;
812
813 dev_dbg(&adapter->dev, "amc6821_detect called.\n");
814
815 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
816 dev_dbg(&adapter->dev,
817 "amc6821: I2C bus doesn't support byte mode, "
818 "skipping.\n");
819 return -ENODEV;
820 }
821
822 dev_id = i2c_smbus_read_byte_data(client, AMC6821_REG_DEV_ID);
823 comp_id = i2c_smbus_read_byte_data(client, AMC6821_REG_COMP_ID);
824 if (dev_id != 0x21 || comp_id != 0x49) {
825 dev_dbg(&adapter->dev,
826 "amc6821: detection failed at 0x%02x.\n",
827 address);
828 return -ENODEV;
829 }
830
831 /*
832 * Bit 7 of the address register is ignored, so we can check the
833 * ID registers again
834 */
835 dev_id = i2c_smbus_read_byte_data(client, 0x80 | AMC6821_REG_DEV_ID);
836 comp_id = i2c_smbus_read_byte_data(client, 0x80 | AMC6821_REG_COMP_ID);
837 if (dev_id != 0x21 || comp_id != 0x49) {
838 dev_dbg(&adapter->dev,
839 "amc6821: detection failed at 0x%02x.\n",
840 address);
841 return -ENODEV;
842 }
843
844 dev_info(&adapter->dev, "amc6821: chip found at 0x%02x.\n", address);
845 strlcpy(info->type, "amc6821", I2C_NAME_SIZE);
846
847 return 0;
848 }
849
amc6821_probe(struct i2c_client * client,const struct i2c_device_id * id)850 static int amc6821_probe(
851 struct i2c_client *client,
852 const struct i2c_device_id *id)
853 {
854 struct amc6821_data *data;
855 int err;
856
857 data = devm_kzalloc(&client->dev, sizeof(struct amc6821_data),
858 GFP_KERNEL);
859 if (!data)
860 return -ENOMEM;
861
862 i2c_set_clientdata(client, data);
863 mutex_init(&data->update_lock);
864
865 /*
866 * Initialize the amc6821 chip
867 */
868 err = amc6821_init_client(client);
869 if (err)
870 return err;
871
872 err = sysfs_create_group(&client->dev.kobj, &amc6821_attr_grp);
873 if (err)
874 return err;
875
876 data->hwmon_dev = hwmon_device_register(&client->dev);
877 if (!IS_ERR(data->hwmon_dev))
878 return 0;
879
880 err = PTR_ERR(data->hwmon_dev);
881 dev_err(&client->dev, "error registering hwmon device.\n");
882 sysfs_remove_group(&client->dev.kobj, &amc6821_attr_grp);
883 return err;
884 }
885
amc6821_remove(struct i2c_client * client)886 static int amc6821_remove(struct i2c_client *client)
887 {
888 struct amc6821_data *data = i2c_get_clientdata(client);
889
890 hwmon_device_unregister(data->hwmon_dev);
891 sysfs_remove_group(&client->dev.kobj, &amc6821_attr_grp);
892
893 return 0;
894 }
895
896
amc6821_init_client(struct i2c_client * client)897 static int amc6821_init_client(struct i2c_client *client)
898 {
899 int config;
900 int err = -EIO;
901
902 if (init) {
903 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF4);
904
905 if (config < 0) {
906 dev_err(&client->dev,
907 "Error reading configuration register, aborting.\n");
908 return err;
909 }
910
911 config |= AMC6821_CONF4_MODE;
912
913 if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF4,
914 config)) {
915 dev_err(&client->dev,
916 "Configuration register write error, aborting.\n");
917 return err;
918 }
919
920 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF3);
921
922 if (config < 0) {
923 dev_err(&client->dev,
924 "Error reading configuration register, aborting.\n");
925 return err;
926 }
927
928 dev_info(&client->dev, "Revision %d\n", config & 0x0f);
929
930 config &= ~AMC6821_CONF3_THERM_FAN_EN;
931
932 if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF3,
933 config)) {
934 dev_err(&client->dev,
935 "Configuration register write error, aborting.\n");
936 return err;
937 }
938
939 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF2);
940
941 if (config < 0) {
942 dev_err(&client->dev,
943 "Error reading configuration register, aborting.\n");
944 return err;
945 }
946
947 config &= ~AMC6821_CONF2_RTFIE;
948 config &= ~AMC6821_CONF2_LTOIE;
949 config &= ~AMC6821_CONF2_RTOIE;
950 if (i2c_smbus_write_byte_data(client,
951 AMC6821_REG_CONF2, config)) {
952 dev_err(&client->dev,
953 "Configuration register write error, aborting.\n");
954 return err;
955 }
956
957 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF1);
958
959 if (config < 0) {
960 dev_err(&client->dev,
961 "Error reading configuration register, aborting.\n");
962 return err;
963 }
964
965 config &= ~AMC6821_CONF1_THERMOVIE;
966 config &= ~AMC6821_CONF1_FANIE;
967 config |= AMC6821_CONF1_START;
968 if (pwminv)
969 config |= AMC6821_CONF1_PWMINV;
970 else
971 config &= ~AMC6821_CONF1_PWMINV;
972
973 if (i2c_smbus_write_byte_data(
974 client, AMC6821_REG_CONF1, config)) {
975 dev_err(&client->dev,
976 "Configuration register write error, aborting.\n");
977 return err;
978 }
979 }
980 return 0;
981 }
982
983
amc6821_update_device(struct device * dev)984 static struct amc6821_data *amc6821_update_device(struct device *dev)
985 {
986 struct i2c_client *client = to_i2c_client(dev);
987 struct amc6821_data *data = i2c_get_clientdata(client);
988 int timeout = HZ;
989 u8 reg;
990 int i;
991
992 mutex_lock(&data->update_lock);
993
994 if (time_after(jiffies, data->last_updated + timeout) ||
995 !data->valid) {
996
997 for (i = 0; i < TEMP_IDX_LEN; i++)
998 data->temp[i] = i2c_smbus_read_byte_data(client,
999 temp_reg[i]);
1000
1001 data->stat1 = i2c_smbus_read_byte_data(client,
1002 AMC6821_REG_STAT1);
1003 data->stat2 = i2c_smbus_read_byte_data(client,
1004 AMC6821_REG_STAT2);
1005
1006 data->pwm1 = i2c_smbus_read_byte_data(client,
1007 AMC6821_REG_DCY);
1008 for (i = 0; i < FAN1_IDX_LEN; i++) {
1009 data->fan[i] = i2c_smbus_read_byte_data(
1010 client,
1011 fan_reg_low[i]);
1012 data->fan[i] += i2c_smbus_read_byte_data(
1013 client,
1014 fan_reg_hi[i]) << 8;
1015 }
1016 data->fan1_div = i2c_smbus_read_byte_data(client,
1017 AMC6821_REG_CONF4);
1018 data->fan1_div = data->fan1_div & AMC6821_CONF4_PSPR ? 4 : 2;
1019
1020 data->pwm1_auto_point_pwm[0] = 0;
1021 data->pwm1_auto_point_pwm[2] = 255;
1022 data->pwm1_auto_point_pwm[1] = i2c_smbus_read_byte_data(client,
1023 AMC6821_REG_DCY_LOW_TEMP);
1024
1025 data->temp1_auto_point_temp[0] =
1026 i2c_smbus_read_byte_data(client,
1027 AMC6821_REG_PSV_TEMP);
1028 data->temp2_auto_point_temp[0] =
1029 data->temp1_auto_point_temp[0];
1030 reg = i2c_smbus_read_byte_data(client,
1031 AMC6821_REG_LTEMP_FAN_CTRL);
1032 data->temp1_auto_point_temp[1] = (reg & 0xF8) >> 1;
1033 reg &= 0x07;
1034 reg = 0x20 >> reg;
1035 if (reg > 0)
1036 data->temp1_auto_point_temp[2] =
1037 data->temp1_auto_point_temp[1] +
1038 (data->pwm1_auto_point_pwm[2] -
1039 data->pwm1_auto_point_pwm[1]) / reg;
1040 else
1041 data->temp1_auto_point_temp[2] = 255;
1042
1043 reg = i2c_smbus_read_byte_data(client,
1044 AMC6821_REG_RTEMP_FAN_CTRL);
1045 data->temp2_auto_point_temp[1] = (reg & 0xF8) >> 1;
1046 reg &= 0x07;
1047 reg = 0x20 >> reg;
1048 if (reg > 0)
1049 data->temp2_auto_point_temp[2] =
1050 data->temp2_auto_point_temp[1] +
1051 (data->pwm1_auto_point_pwm[2] -
1052 data->pwm1_auto_point_pwm[1]) / reg;
1053 else
1054 data->temp2_auto_point_temp[2] = 255;
1055
1056 reg = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF1);
1057 reg = (reg >> 5) & 0x3;
1058 switch (reg) {
1059 case 0: /*open loop: software sets pwm1*/
1060 data->pwm1_auto_channels_temp = 0;
1061 data->pwm1_enable = 1;
1062 break;
1063 case 2: /*closed loop: remote T (temp2)*/
1064 data->pwm1_auto_channels_temp = 2;
1065 data->pwm1_enable = 2;
1066 break;
1067 case 3: /*closed loop: local and remote T (temp2)*/
1068 data->pwm1_auto_channels_temp = 3;
1069 data->pwm1_enable = 3;
1070 break;
1071 case 1: /*
1072 * semi-open loop: software sets rpm, chip controls
1073 * pwm1, currently not implemented
1074 */
1075 data->pwm1_auto_channels_temp = 0;
1076 data->pwm1_enable = 0;
1077 break;
1078 }
1079
1080 data->last_updated = jiffies;
1081 data->valid = 1;
1082 }
1083 mutex_unlock(&data->update_lock);
1084 return data;
1085 }
1086
1087 module_i2c_driver(amc6821_driver);
1088
1089 MODULE_LICENSE("GPL");
1090 MODULE_AUTHOR("T. Mertelj <tomaz.mertelj@guest.arnes.si>");
1091 MODULE_DESCRIPTION("Texas Instruments amc6821 hwmon driver");
1092