2 * amc6821.c - Part of lm_sensors, Linux kernel modules for hardware
4 * Copyright (C) 2009 T. Mertelj <tomaz.mertelj@guest.arnes.si>
7 * Copyright (C) 2007 Hans J. Koch <hjk@hansjkoch.de>
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.
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.
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.
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>
41 static const unsigned short normal_i2c[] = {0x18, 0x19, 0x1a, 0x2c, 0x2d, 0x2e,
42 0x4c, 0x4d, 0x4e, I2C_CLIENT_END};
50 static int pwminv; /*Inverted PWM output. */
51 module_param(pwminv, int, S_IRUGO);
53 static int init = 1; /*Power-on initialization.*/
54 module_param(init, int, S_IRUGO);
57 enum chips { amc6821 };
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
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
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
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
106 #define AMC6821_CONF3_THERM_FAN_EN 0x80
107 #define AMC6821_CONF3_REV_MASK 0x0F
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
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
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
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,
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, };
143 enum {IDX_FAN1_INPUT = 0, IDX_FAN1_MIN, IDX_FAN1_MAX,
146 static const u8 fan_reg_low[] = {AMC6821_REG_TDATA_LOW,
147 AMC6821_REG_TACH_LLIMITL,
148 AMC6821_REG_TACH_HLIMITL, };
151 static const u8 fan_reg_hi[] = {AMC6821_REG_TDATA_HI,
152 AMC6821_REG_TACH_LLIMITH,
153 AMC6821_REG_TACH_HLIMITH, };
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);
166 * Driver data (common to all clients)
169 static const struct i2c_device_id amc6821_id[] = {
170 { "amc6821", amc6821 },
174 MODULE_DEVICE_TABLE(i2c, amc6821_id);
176 static struct i2c_driver amc6821_driver = {
177 .class = I2C_CLASS_HWMON,
181 .probe = amc6821_probe,
182 .remove = amc6821_remove,
183 .id_table = amc6821_id,
184 .detect = amc6821_detect,
185 .address_list = normal_i2c,
190 * Client data (each client gets its own)
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 */
199 /* register values */
200 int temp[TEMP_IDX_LEN];
202 u16 fan[FAN1_IDX_LEN];
206 u8 temp1_auto_point_temp[3];
207 u8 temp2_auto_point_temp[3];
208 u8 pwm1_auto_point_pwm[3];
210 u8 pwm1_auto_channels_temp;
217 static ssize_t get_temp(
219 struct device_attribute *devattr,
222 struct amc6821_data *data = amc6821_update_device(dev);
223 int ix = to_sensor_dev_attr(devattr)->index;
225 return sprintf(buf, "%d\n", data->temp[ix] * 1000);
230 static ssize_t set_temp(
232 struct device_attribute *attr,
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;
241 int ret = kstrtol(buf, 10, &val);
244 val = clamp_val(val / 1000, -128, 127);
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");
252 mutex_unlock(&data->update_lock);
259 static ssize_t get_temp_alarm(
261 struct device_attribute *devattr,
264 struct amc6821_data *data = amc6821_update_device(dev);
265 int ix = to_sensor_dev_attr(devattr)->index;
270 flag = data->stat1 & AMC6821_STAT1_LTL;
273 flag = data->stat1 & AMC6821_STAT1_LTH;
276 flag = data->stat2 & AMC6821_STAT2_LTC;
279 flag = data->stat1 & AMC6821_STAT1_RTL;
282 flag = data->stat1 & AMC6821_STAT1_RTH;
285 flag = data->stat2 & AMC6821_STAT2_RTC;
288 dev_dbg(dev, "Unknown attr->index (%d).\n", ix);
292 return sprintf(buf, "1");
294 return sprintf(buf, "0");
300 static ssize_t get_temp2_fault(
302 struct device_attribute *devattr,
305 struct amc6821_data *data = amc6821_update_device(dev);
306 if (data->stat1 & AMC6821_STAT1_RTF)
307 return sprintf(buf, "1");
309 return sprintf(buf, "0");
312 static ssize_t get_pwm1(
314 struct device_attribute *devattr,
317 struct amc6821_data *data = amc6821_update_device(dev);
318 return sprintf(buf, "%d\n", data->pwm1);
321 static ssize_t set_pwm1(
323 struct device_attribute *devattr,
327 struct i2c_client *client = to_i2c_client(dev);
328 struct amc6821_data *data = i2c_get_clientdata(client);
330 int ret = kstrtol(buf, 10, &val);
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);
341 static ssize_t get_pwm1_enable(
343 struct device_attribute *devattr,
346 struct amc6821_data *data = amc6821_update_device(dev);
347 return sprintf(buf, "%d\n", data->pwm1_enable);
350 static ssize_t set_pwm1_enable(
352 struct device_attribute *attr,
356 struct i2c_client *client = to_i2c_client(dev);
357 struct amc6821_data *data = i2c_get_clientdata(client);
359 int config = kstrtol(buf, 10, &val);
363 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF1);
365 dev_err(&client->dev,
366 "Error reading configuration register, aborting.\n");
372 config &= ~AMC6821_CONF1_FDRC0;
373 config &= ~AMC6821_CONF1_FDRC1;
376 config &= ~AMC6821_CONF1_FDRC0;
377 config |= AMC6821_CONF1_FDRC1;
380 config |= AMC6821_CONF1_FDRC0;
381 config |= AMC6821_CONF1_FDRC1;
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");
392 mutex_unlock(&data->update_lock);
397 static ssize_t get_pwm1_auto_channels_temp(
399 struct device_attribute *devattr,
402 struct amc6821_data *data = amc6821_update_device(dev);
403 return sprintf(buf, "%d\n", data->pwm1_auto_channels_temp);
407 static ssize_t get_temp_auto_point_temp(
409 struct device_attribute *devattr,
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);
417 return sprintf(buf, "%d\n",
418 data->temp1_auto_point_temp[ix] * 1000);
420 return sprintf(buf, "%d\n",
421 data->temp2_auto_point_temp[ix] * 1000);
423 dev_dbg(dev, "Unknown attr->nr (%d).\n", nr);
429 static ssize_t get_pwm1_auto_point_pwm(
431 struct device_attribute *devattr,
434 int ix = to_sensor_dev_attr(devattr)->index;
435 struct amc6821_data *data = amc6821_update_device(dev);
436 return sprintf(buf, "%d\n", data->pwm1_auto_point_pwm[ix]);
440 static inline ssize_t set_slope_register(struct i2c_client *client,
448 dt = ptemp[2]-ptemp[1];
449 for (tmp = 4; tmp > 0; tmp--) {
450 if (dt * (0x20 >> tmp) >= dpwm)
453 tmp |= (ptemp[1] & 0x7C) << 1;
454 if (i2c_smbus_write_byte_data(client,
456 dev_err(&client->dev, "Register write error, aborting.\n");
464 static ssize_t set_temp_auto_point_temp(
466 struct device_attribute *attr,
470 struct i2c_client *client = to_i2c_client(dev);
471 struct amc6821_data *data = amc6821_update_device(dev);
472 int ix = to_sensor_dev_attr_2(attr)->index;
473 int nr = to_sensor_dev_attr_2(attr)->nr;
478 int ret = kstrtol(buf, 10, &val);
484 ptemp = data->temp1_auto_point_temp;
485 reg = AMC6821_REG_LTEMP_FAN_CTRL;
488 ptemp = data->temp2_auto_point_temp;
489 reg = AMC6821_REG_RTEMP_FAN_CTRL;
492 dev_dbg(dev, "Unknown attr->nr (%d).\n", nr);
497 mutex_lock(&data->update_lock);
500 ptemp[0] = clamp_val(val / 1000, 0,
501 data->temp1_auto_point_temp[1]);
502 ptemp[0] = clamp_val(ptemp[0], 0,
503 data->temp2_auto_point_temp[1]);
504 ptemp[0] = clamp_val(ptemp[0], 0, 63);
505 if (i2c_smbus_write_byte_data(
507 AMC6821_REG_PSV_TEMP,
509 dev_err(&client->dev,
510 "Register write error, aborting.\n");
515 ptemp[1] = clamp_val(val / 1000, (ptemp[0] & 0x7C) + 4, 124);
517 ptemp[2] = clamp_val(ptemp[2], ptemp[1] + 1, 255);
520 ptemp[2] = clamp_val(val / 1000, ptemp[1]+1, 255);
523 dev_dbg(dev, "Unknown attr->index (%d).\n", ix);
527 dpwm = data->pwm1_auto_point_pwm[2] - data->pwm1_auto_point_pwm[1];
528 if (set_slope_register(client, reg, dpwm, ptemp))
532 mutex_unlock(&data->update_lock);
538 static ssize_t set_pwm1_auto_point_pwm(
540 struct device_attribute *attr,
544 struct i2c_client *client = to_i2c_client(dev);
545 struct amc6821_data *data = i2c_get_clientdata(client);
548 int ret = kstrtol(buf, 10, &val);
552 mutex_lock(&data->update_lock);
553 data->pwm1_auto_point_pwm[1] = clamp_val(val, 0, 254);
554 if (i2c_smbus_write_byte_data(client, AMC6821_REG_DCY_LOW_TEMP,
555 data->pwm1_auto_point_pwm[1])) {
556 dev_err(&client->dev, "Register write error, aborting.\n");
560 dpwm = data->pwm1_auto_point_pwm[2] - data->pwm1_auto_point_pwm[1];
561 if (set_slope_register(client, AMC6821_REG_LTEMP_FAN_CTRL, dpwm,
562 data->temp1_auto_point_temp)) {
566 if (set_slope_register(client, AMC6821_REG_RTEMP_FAN_CTRL, dpwm,
567 data->temp2_auto_point_temp)) {
574 mutex_unlock(&data->update_lock);
578 static ssize_t get_fan(
580 struct device_attribute *devattr,
583 struct amc6821_data *data = amc6821_update_device(dev);
584 int ix = to_sensor_dev_attr(devattr)->index;
585 if (0 == data->fan[ix])
586 return sprintf(buf, "0");
587 return sprintf(buf, "%d\n", (int)(6000000 / data->fan[ix]));
592 static ssize_t get_fan1_fault(
594 struct device_attribute *devattr,
597 struct amc6821_data *data = amc6821_update_device(dev);
598 if (data->stat1 & AMC6821_STAT1_FANS)
599 return sprintf(buf, "1");
601 return sprintf(buf, "0");
606 static ssize_t set_fan(
608 struct device_attribute *attr,
609 const char *buf, size_t count)
611 struct i2c_client *client = to_i2c_client(dev);
612 struct amc6821_data *data = i2c_get_clientdata(client);
614 int ix = to_sensor_dev_attr(attr)->index;
615 int ret = kstrtol(buf, 10, &val);
618 val = 1 > val ? 0xFFFF : 6000000/val;
620 mutex_lock(&data->update_lock);
621 data->fan[ix] = (u16) clamp_val(val, 1, 0xFFFF);
622 if (i2c_smbus_write_byte_data(client, fan_reg_low[ix],
623 data->fan[ix] & 0xFF)) {
624 dev_err(&client->dev, "Register write error, aborting.\n");
628 if (i2c_smbus_write_byte_data(client,
629 fan_reg_hi[ix], data->fan[ix] >> 8)) {
630 dev_err(&client->dev, "Register write error, aborting.\n");
634 mutex_unlock(&data->update_lock);
640 static ssize_t get_fan1_div(
642 struct device_attribute *devattr,
645 struct amc6821_data *data = amc6821_update_device(dev);
646 return sprintf(buf, "%d\n", data->fan1_div);
649 static ssize_t set_fan1_div(
651 struct device_attribute *attr,
652 const char *buf, size_t count)
654 struct i2c_client *client = to_i2c_client(dev);
655 struct amc6821_data *data = i2c_get_clientdata(client);
657 int config = kstrtol(buf, 10, &val);
661 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF4);
663 dev_err(&client->dev,
664 "Error reading configuration register, aborting.\n");
667 mutex_lock(&data->update_lock);
670 config &= ~AMC6821_CONF4_PSPR;
674 config |= AMC6821_CONF4_PSPR;
681 if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF4, config)) {
682 dev_err(&client->dev,
683 "Configuration register write error, aborting.\n");
687 mutex_unlock(&data->update_lock);
693 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO,
694 get_temp, NULL, IDX_TEMP1_INPUT);
695 static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO | S_IWUSR, get_temp,
696 set_temp, IDX_TEMP1_MIN);
697 static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR, get_temp,
698 set_temp, IDX_TEMP1_MAX);
699 static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO | S_IWUSR, get_temp,
700 set_temp, IDX_TEMP1_CRIT);
701 static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO,
702 get_temp_alarm, NULL, IDX_TEMP1_MIN);
703 static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO,
704 get_temp_alarm, NULL, IDX_TEMP1_MAX);
705 static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO,
706 get_temp_alarm, NULL, IDX_TEMP1_CRIT);
707 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO,
708 get_temp, NULL, IDX_TEMP2_INPUT);
709 static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO | S_IWUSR, get_temp,
710 set_temp, IDX_TEMP2_MIN);
711 static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO | S_IWUSR, get_temp,
712 set_temp, IDX_TEMP2_MAX);
713 static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO | S_IWUSR, get_temp,
714 set_temp, IDX_TEMP2_CRIT);
715 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO,
716 get_temp2_fault, NULL, 0);
717 static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO,
718 get_temp_alarm, NULL, IDX_TEMP2_MIN);
719 static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO,
720 get_temp_alarm, NULL, IDX_TEMP2_MAX);
721 static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO,
722 get_temp_alarm, NULL, IDX_TEMP2_CRIT);
723 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, get_fan, NULL, IDX_FAN1_INPUT);
724 static SENSOR_DEVICE_ATTR(fan1_min, S_IRUGO | S_IWUSR,
725 get_fan, set_fan, IDX_FAN1_MIN);
726 static SENSOR_DEVICE_ATTR(fan1_max, S_IRUGO | S_IWUSR,
727 get_fan, set_fan, IDX_FAN1_MAX);
728 static SENSOR_DEVICE_ATTR(fan1_fault, S_IRUGO, get_fan1_fault, NULL, 0);
729 static SENSOR_DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR,
730 get_fan1_div, set_fan1_div, 0);
732 static SENSOR_DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, get_pwm1, set_pwm1, 0);
733 static SENSOR_DEVICE_ATTR(pwm1_enable, S_IWUSR | S_IRUGO,
734 get_pwm1_enable, set_pwm1_enable, 0);
735 static SENSOR_DEVICE_ATTR(pwm1_auto_point1_pwm, S_IRUGO,
736 get_pwm1_auto_point_pwm, NULL, 0);
737 static SENSOR_DEVICE_ATTR(pwm1_auto_point2_pwm, S_IWUSR | S_IRUGO,
738 get_pwm1_auto_point_pwm, set_pwm1_auto_point_pwm, 1);
739 static SENSOR_DEVICE_ATTR(pwm1_auto_point3_pwm, S_IRUGO,
740 get_pwm1_auto_point_pwm, NULL, 2);
741 static SENSOR_DEVICE_ATTR(pwm1_auto_channels_temp, S_IRUGO,
742 get_pwm1_auto_channels_temp, NULL, 0);
743 static SENSOR_DEVICE_ATTR_2(temp1_auto_point1_temp, S_IRUGO,
744 get_temp_auto_point_temp, NULL, 1, 0);
745 static SENSOR_DEVICE_ATTR_2(temp1_auto_point2_temp, S_IWUSR | S_IRUGO,
746 get_temp_auto_point_temp, set_temp_auto_point_temp, 1, 1);
747 static SENSOR_DEVICE_ATTR_2(temp1_auto_point3_temp, S_IWUSR | S_IRUGO,
748 get_temp_auto_point_temp, set_temp_auto_point_temp, 1, 2);
750 static SENSOR_DEVICE_ATTR_2(temp2_auto_point1_temp, S_IWUSR | S_IRUGO,
751 get_temp_auto_point_temp, set_temp_auto_point_temp, 2, 0);
752 static SENSOR_DEVICE_ATTR_2(temp2_auto_point2_temp, S_IWUSR | S_IRUGO,
753 get_temp_auto_point_temp, set_temp_auto_point_temp, 2, 1);
754 static SENSOR_DEVICE_ATTR_2(temp2_auto_point3_temp, S_IWUSR | S_IRUGO,
755 get_temp_auto_point_temp, set_temp_auto_point_temp, 2, 2);
759 static struct attribute *amc6821_attrs[] = {
760 &sensor_dev_attr_temp1_input.dev_attr.attr,
761 &sensor_dev_attr_temp1_min.dev_attr.attr,
762 &sensor_dev_attr_temp1_max.dev_attr.attr,
763 &sensor_dev_attr_temp1_crit.dev_attr.attr,
764 &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
765 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
766 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
767 &sensor_dev_attr_temp2_input.dev_attr.attr,
768 &sensor_dev_attr_temp2_min.dev_attr.attr,
769 &sensor_dev_attr_temp2_max.dev_attr.attr,
770 &sensor_dev_attr_temp2_crit.dev_attr.attr,
771 &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
772 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
773 &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
774 &sensor_dev_attr_temp2_fault.dev_attr.attr,
775 &sensor_dev_attr_fan1_input.dev_attr.attr,
776 &sensor_dev_attr_fan1_min.dev_attr.attr,
777 &sensor_dev_attr_fan1_max.dev_attr.attr,
778 &sensor_dev_attr_fan1_fault.dev_attr.attr,
779 &sensor_dev_attr_fan1_div.dev_attr.attr,
780 &sensor_dev_attr_pwm1.dev_attr.attr,
781 &sensor_dev_attr_pwm1_enable.dev_attr.attr,
782 &sensor_dev_attr_pwm1_auto_channels_temp.dev_attr.attr,
783 &sensor_dev_attr_pwm1_auto_point1_pwm.dev_attr.attr,
784 &sensor_dev_attr_pwm1_auto_point2_pwm.dev_attr.attr,
785 &sensor_dev_attr_pwm1_auto_point3_pwm.dev_attr.attr,
786 &sensor_dev_attr_temp1_auto_point1_temp.dev_attr.attr,
787 &sensor_dev_attr_temp1_auto_point2_temp.dev_attr.attr,
788 &sensor_dev_attr_temp1_auto_point3_temp.dev_attr.attr,
789 &sensor_dev_attr_temp2_auto_point1_temp.dev_attr.attr,
790 &sensor_dev_attr_temp2_auto_point2_temp.dev_attr.attr,
791 &sensor_dev_attr_temp2_auto_point3_temp.dev_attr.attr,
795 static struct attribute_group amc6821_attr_grp = {
796 .attrs = amc6821_attrs,
801 /* Return 0 if detection is successful, -ENODEV otherwise */
802 static int amc6821_detect(
803 struct i2c_client *client,
804 struct i2c_board_info *info)
806 struct i2c_adapter *adapter = client->adapter;
807 int address = client->addr;
810 dev_dbg(&adapter->dev, "amc6821_detect called.\n");
812 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
813 dev_dbg(&adapter->dev,
814 "amc6821: I2C bus doesn't support byte mode, "
819 dev_id = i2c_smbus_read_byte_data(client, AMC6821_REG_DEV_ID);
820 comp_id = i2c_smbus_read_byte_data(client, AMC6821_REG_COMP_ID);
821 if (dev_id != 0x21 || comp_id != 0x49) {
822 dev_dbg(&adapter->dev,
823 "amc6821: detection failed at 0x%02x.\n",
829 * Bit 7 of the address register is ignored, so we can check the
832 dev_id = i2c_smbus_read_byte_data(client, 0x80 | AMC6821_REG_DEV_ID);
833 comp_id = i2c_smbus_read_byte_data(client, 0x80 | AMC6821_REG_COMP_ID);
834 if (dev_id != 0x21 || comp_id != 0x49) {
835 dev_dbg(&adapter->dev,
836 "amc6821: detection failed at 0x%02x.\n",
841 dev_info(&adapter->dev, "amc6821: chip found at 0x%02x.\n", address);
842 strlcpy(info->type, "amc6821", I2C_NAME_SIZE);
847 static int amc6821_probe(
848 struct i2c_client *client,
849 const struct i2c_device_id *id)
851 struct amc6821_data *data;
854 data = devm_kzalloc(&client->dev, sizeof(struct amc6821_data),
859 i2c_set_clientdata(client, data);
860 mutex_init(&data->update_lock);
863 * Initialize the amc6821 chip
865 err = amc6821_init_client(client);
869 err = sysfs_create_group(&client->dev.kobj, &amc6821_attr_grp);
873 data->hwmon_dev = hwmon_device_register(&client->dev);
874 if (!IS_ERR(data->hwmon_dev))
877 err = PTR_ERR(data->hwmon_dev);
878 dev_err(&client->dev, "error registering hwmon device.\n");
879 sysfs_remove_group(&client->dev.kobj, &amc6821_attr_grp);
883 static int amc6821_remove(struct i2c_client *client)
885 struct amc6821_data *data = i2c_get_clientdata(client);
887 hwmon_device_unregister(data->hwmon_dev);
888 sysfs_remove_group(&client->dev.kobj, &amc6821_attr_grp);
894 static int amc6821_init_client(struct i2c_client *client)
900 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF4);
903 dev_err(&client->dev,
904 "Error reading configuration register, aborting.\n");
908 config |= AMC6821_CONF4_MODE;
910 if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF4,
912 dev_err(&client->dev,
913 "Configuration register write error, aborting.\n");
917 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF3);
920 dev_err(&client->dev,
921 "Error reading configuration register, aborting.\n");
925 dev_info(&client->dev, "Revision %d\n", config & 0x0f);
927 config &= ~AMC6821_CONF3_THERM_FAN_EN;
929 if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF3,
931 dev_err(&client->dev,
932 "Configuration register write error, aborting.\n");
936 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF2);
939 dev_err(&client->dev,
940 "Error reading configuration register, aborting.\n");
944 config &= ~AMC6821_CONF2_RTFIE;
945 config &= ~AMC6821_CONF2_LTOIE;
946 config &= ~AMC6821_CONF2_RTOIE;
947 if (i2c_smbus_write_byte_data(client,
948 AMC6821_REG_CONF2, config)) {
949 dev_err(&client->dev,
950 "Configuration register write error, aborting.\n");
954 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF1);
957 dev_err(&client->dev,
958 "Error reading configuration register, aborting.\n");
962 config &= ~AMC6821_CONF1_THERMOVIE;
963 config &= ~AMC6821_CONF1_FANIE;
964 config |= AMC6821_CONF1_START;
966 config |= AMC6821_CONF1_PWMINV;
968 config &= ~AMC6821_CONF1_PWMINV;
970 if (i2c_smbus_write_byte_data(
971 client, AMC6821_REG_CONF1, config)) {
972 dev_err(&client->dev,
973 "Configuration register write error, aborting.\n");
981 static struct amc6821_data *amc6821_update_device(struct device *dev)
983 struct i2c_client *client = to_i2c_client(dev);
984 struct amc6821_data *data = i2c_get_clientdata(client);
989 mutex_lock(&data->update_lock);
991 if (time_after(jiffies, data->last_updated + timeout) ||
994 for (i = 0; i < TEMP_IDX_LEN; i++)
995 data->temp[i] = i2c_smbus_read_byte_data(client,
998 data->stat1 = i2c_smbus_read_byte_data(client,
1000 data->stat2 = i2c_smbus_read_byte_data(client,
1003 data->pwm1 = i2c_smbus_read_byte_data(client,
1005 for (i = 0; i < FAN1_IDX_LEN; i++) {
1006 data->fan[i] = i2c_smbus_read_byte_data(
1009 data->fan[i] += i2c_smbus_read_byte_data(
1011 fan_reg_hi[i]) << 8;
1013 data->fan1_div = i2c_smbus_read_byte_data(client,
1015 data->fan1_div = data->fan1_div & AMC6821_CONF4_PSPR ? 4 : 2;
1017 data->pwm1_auto_point_pwm[0] = 0;
1018 data->pwm1_auto_point_pwm[2] = 255;
1019 data->pwm1_auto_point_pwm[1] = i2c_smbus_read_byte_data(client,
1020 AMC6821_REG_DCY_LOW_TEMP);
1022 data->temp1_auto_point_temp[0] =
1023 i2c_smbus_read_byte_data(client,
1024 AMC6821_REG_PSV_TEMP);
1025 data->temp2_auto_point_temp[0] =
1026 data->temp1_auto_point_temp[0];
1027 reg = i2c_smbus_read_byte_data(client,
1028 AMC6821_REG_LTEMP_FAN_CTRL);
1029 data->temp1_auto_point_temp[1] = (reg & 0xF8) >> 1;
1033 data->temp1_auto_point_temp[2] =
1034 data->temp1_auto_point_temp[1] +
1035 (data->pwm1_auto_point_pwm[2] -
1036 data->pwm1_auto_point_pwm[1]) / reg;
1038 data->temp1_auto_point_temp[2] = 255;
1040 reg = i2c_smbus_read_byte_data(client,
1041 AMC6821_REG_RTEMP_FAN_CTRL);
1042 data->temp2_auto_point_temp[1] = (reg & 0xF8) >> 1;
1046 data->temp2_auto_point_temp[2] =
1047 data->temp2_auto_point_temp[1] +
1048 (data->pwm1_auto_point_pwm[2] -
1049 data->pwm1_auto_point_pwm[1]) / reg;
1051 data->temp2_auto_point_temp[2] = 255;
1053 reg = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF1);
1054 reg = (reg >> 5) & 0x3;
1056 case 0: /*open loop: software sets pwm1*/
1057 data->pwm1_auto_channels_temp = 0;
1058 data->pwm1_enable = 1;
1060 case 2: /*closed loop: remote T (temp2)*/
1061 data->pwm1_auto_channels_temp = 2;
1062 data->pwm1_enable = 2;
1064 case 3: /*closed loop: local and remote T (temp2)*/
1065 data->pwm1_auto_channels_temp = 3;
1066 data->pwm1_enable = 3;
1069 * semi-open loop: software sets rpm, chip controls
1070 * pwm1, currently not implemented
1072 data->pwm1_auto_channels_temp = 0;
1073 data->pwm1_enable = 0;
1077 data->last_updated = jiffies;
1080 mutex_unlock(&data->update_lock);
1084 module_i2c_driver(amc6821_driver);
1086 MODULE_LICENSE("GPL");
1087 MODULE_AUTHOR("T. Mertelj <tomaz.mertelj@guest.arnes.si>");
1088 MODULE_DESCRIPTION("Texas Instruments amc6821 hwmon driver");