1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * A hwmon driver for the Analog Devices ADT7470
4 * Copyright (C) 2007 IBM
6 * Author: Darrick J. Wong <darrick.wong@oracle.com>
9 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
11 #include <linux/module.h>
12 #include <linux/jiffies.h>
13 #include <linux/i2c.h>
14 #include <linux/hwmon.h>
15 #include <linux/hwmon-sysfs.h>
16 #include <linux/err.h>
17 #include <linux/mutex.h>
18 #include <linux/delay.h>
19 #include <linux/log2.h>
20 #include <linux/kthread.h>
21 #include <linux/regmap.h>
22 #include <linux/sched.h>
23 #include <linux/slab.h>
24 #include <linux/util_macros.h>
26 /* Addresses to scan */
27 static const unsigned short normal_i2c[] = { 0x2C, 0x2E, 0x2F, I2C_CLIENT_END };
29 /* ADT7470 registers */
30 #define ADT7470_REG_BASE_ADDR 0x20
31 #define ADT7470_REG_TEMP_BASE_ADDR 0x20
32 #define ADT7470_REG_TEMP_MAX_ADDR 0x29
33 #define ADT7470_REG_FAN_BASE_ADDR 0x2A
34 #define ADT7470_REG_FAN_MAX_ADDR 0x31
35 #define ADT7470_REG_PWM_BASE_ADDR 0x32
36 #define ADT7470_REG_PWM_MAX_ADDR 0x35
37 #define ADT7470_REG_PWM_MAX_BASE_ADDR 0x38
38 #define ADT7470_REG_PWM_MAX_MAX_ADDR 0x3B
39 #define ADT7470_REG_CFG 0x40
40 #define ADT7470_STRT_MASK 0x01
41 #define ADT7470_TEST_MASK 0x02
42 #define ADT7470_FSPD_MASK 0x04
43 #define ADT7470_T05_STB_MASK 0x80
44 #define ADT7470_REG_ALARM1 0x41
45 #define ADT7470_R1T_ALARM 0x01
46 #define ADT7470_R2T_ALARM 0x02
47 #define ADT7470_R3T_ALARM 0x04
48 #define ADT7470_R4T_ALARM 0x08
49 #define ADT7470_R5T_ALARM 0x10
50 #define ADT7470_R6T_ALARM 0x20
51 #define ADT7470_R7T_ALARM 0x40
52 #define ADT7470_OOL_ALARM 0x80
53 #define ADT7470_REG_ALARM2 0x42
54 #define ADT7470_R8T_ALARM 0x01
55 #define ADT7470_R9T_ALARM 0x02
56 #define ADT7470_R10T_ALARM 0x04
57 #define ADT7470_FAN1_ALARM 0x10
58 #define ADT7470_FAN2_ALARM 0x20
59 #define ADT7470_FAN3_ALARM 0x40
60 #define ADT7470_FAN4_ALARM 0x80
61 #define ADT7470_REG_TEMP_LIMITS_BASE_ADDR 0x44
62 #define ADT7470_REG_TEMP_LIMITS_MAX_ADDR 0x57
63 #define ADT7470_REG_FAN_MIN_BASE_ADDR 0x58
64 #define ADT7470_REG_FAN_MIN_MAX_ADDR 0x5F
65 #define ADT7470_REG_FAN_MAX_BASE_ADDR 0x60
66 #define ADT7470_REG_FAN_MAX_MAX_ADDR 0x67
67 #define ADT7470_REG_PWM_CFG_BASE_ADDR 0x68
68 #define ADT7470_REG_PWM12_CFG 0x68
69 #define ADT7470_PWM2_AUTO_MASK 0x40
70 #define ADT7470_PWM1_AUTO_MASK 0x80
71 #define ADT7470_PWM_AUTO_MASK 0xC0
72 #define ADT7470_REG_PWM34_CFG 0x69
73 #define ADT7470_PWM3_AUTO_MASK 0x40
74 #define ADT7470_PWM4_AUTO_MASK 0x80
75 #define ADT7470_REG_PWM_MIN_BASE_ADDR 0x6A
76 #define ADT7470_REG_PWM_MIN_MAX_ADDR 0x6D
77 #define ADT7470_REG_PWM_TEMP_MIN_BASE_ADDR 0x6E
78 #define ADT7470_REG_PWM_TEMP_MIN_MAX_ADDR 0x71
79 #define ADT7470_REG_CFG_2 0x74
80 #define ADT7470_REG_ACOUSTICS12 0x75
81 #define ADT7470_REG_ACOUSTICS34 0x76
82 #define ADT7470_REG_DEVICE 0x3D
83 #define ADT7470_REG_VENDOR 0x3E
84 #define ADT7470_REG_REVISION 0x3F
85 #define ADT7470_REG_ALARM1_MASK 0x72
86 #define ADT7470_REG_ALARM2_MASK 0x73
87 #define ADT7470_REG_PWM_AUTO_TEMP_BASE_ADDR 0x7C
88 #define ADT7470_REG_PWM_AUTO_TEMP_MAX_ADDR 0x7D
89 #define ADT7470_REG_MAX_ADDR 0x81
91 #define ADT7470_TEMP_COUNT 10
92 #define ADT7470_TEMP_REG(x) (ADT7470_REG_TEMP_BASE_ADDR + (x))
93 #define ADT7470_TEMP_MIN_REG(x) (ADT7470_REG_TEMP_LIMITS_BASE_ADDR + ((x) * 2))
94 #define ADT7470_TEMP_MAX_REG(x) (ADT7470_REG_TEMP_LIMITS_BASE_ADDR + \
97 #define ADT7470_FAN_COUNT 4
98 #define ADT7470_REG_FAN(x) (ADT7470_REG_FAN_BASE_ADDR + ((x) * 2))
99 #define ADT7470_REG_FAN_MIN(x) (ADT7470_REG_FAN_MIN_BASE_ADDR + ((x) * 2))
100 #define ADT7470_REG_FAN_MAX(x) (ADT7470_REG_FAN_MAX_BASE_ADDR + ((x) * 2))
102 #define ADT7470_PWM_COUNT 4
103 #define ADT7470_REG_PWM(x) (ADT7470_REG_PWM_BASE_ADDR + (x))
104 #define ADT7470_REG_PWM_MAX(x) (ADT7470_REG_PWM_MAX_BASE_ADDR + (x))
105 #define ADT7470_REG_PWM_MIN(x) (ADT7470_REG_PWM_MIN_BASE_ADDR + (x))
106 #define ADT7470_REG_PWM_TMIN(x) (ADT7470_REG_PWM_TEMP_MIN_BASE_ADDR + (x))
107 #define ADT7470_REG_PWM_CFG(x) (ADT7470_REG_PWM_CFG_BASE_ADDR + ((x) / 2))
108 #define ADT7470_REG_PWM_AUTO_TEMP(x) (ADT7470_REG_PWM_AUTO_TEMP_BASE_ADDR + \
111 #define ALARM2(x) ((x) << 8)
113 #define ADT7470_VENDOR 0x41
114 #define ADT7470_DEVICE 0x70
115 /* datasheet only mentions a revision 2 */
116 #define ADT7470_REVISION 0x02
118 /* "all temps" according to hwmon sysfs interface spec */
119 #define ADT7470_PWM_ALL_TEMPS 0x3FF
121 /* How often do we reread sensors values? (In jiffies) */
122 #define SENSOR_REFRESH_INTERVAL (5 * HZ)
124 /* How often do we reread sensor limit values? (In jiffies) */
125 #define LIMIT_REFRESH_INTERVAL (60 * HZ)
127 /* Wait at least 200ms per sensor for 10 sensors */
128 #define TEMP_COLLECTION_TIME 2000
130 /* auto update thing won't fire more than every 2s */
131 #define AUTO_UPDATE_INTERVAL 2000
133 /* datasheet says to divide this number by the fan reading to get fan rpm */
134 #define FAN_PERIOD_TO_RPM(x) ((90000 * 60) / (x))
135 #define FAN_RPM_TO_PERIOD FAN_PERIOD_TO_RPM
136 #define FAN_PERIOD_INVALID 65535
137 #define FAN_DATA_VALID(x) ((x) && (x) != FAN_PERIOD_INVALID)
139 /* Config registers 1 and 2 include fields for selecting the PWM frequency */
140 #define ADT7470_CFG_LF 0x40
141 #define ADT7470_FREQ_MASK 0x70
142 #define ADT7470_FREQ_SHIFT 4
144 struct adt7470_data {
145 struct regmap *regmap;
149 unsigned long sensors_last_updated; /* In jiffies */
150 unsigned long limits_last_updated; /* In jiffies */
152 int num_temp_sensors; /* -1 = probe */
153 int temperatures_probed;
155 s8 temp[ADT7470_TEMP_COUNT];
156 s8 temp_min[ADT7470_TEMP_COUNT];
157 s8 temp_max[ADT7470_TEMP_COUNT];
158 u16 fan[ADT7470_FAN_COUNT];
159 u16 fan_min[ADT7470_FAN_COUNT];
160 u16 fan_max[ADT7470_FAN_COUNT];
164 u8 pwm[ADT7470_PWM_COUNT];
165 u8 pwm_max[ADT7470_PWM_COUNT];
166 u8 pwm_automatic[ADT7470_PWM_COUNT];
167 u8 pwm_min[ADT7470_PWM_COUNT];
168 s8 pwm_tmin[ADT7470_PWM_COUNT];
169 u8 pwm_auto_temp[ADT7470_PWM_COUNT];
171 struct task_struct *auto_update;
172 unsigned int auto_update_interval;
176 * 16-bit registers on the ADT7470 are low-byte first. The data sheet says
177 * that the low byte must be read before the high byte.
179 static inline int adt7470_read_word_data(struct adt7470_data *data, unsigned int reg,
185 err = regmap_bulk_read(data->regmap, reg, ®val, 2);
189 *val = regval[0] | (regval[1] << 8);
194 static inline int adt7470_write_word_data(struct adt7470_data *data, unsigned int reg,
199 regval[0] = val & 0xFF;
200 regval[1] = val >> 8;
202 return regmap_bulk_write(data->regmap, reg, ®val, 2);
205 /* Probe for temperature sensors. Assumes lock is held */
206 static int adt7470_read_temperatures(struct adt7470_data *data)
209 unsigned int pwm_cfg[2];
212 u8 pwm[ADT7470_FAN_COUNT];
214 /* save pwm[1-4] config register */
215 err = regmap_read(data->regmap, ADT7470_REG_PWM_CFG(0), &pwm_cfg[0]);
218 err = regmap_read(data->regmap, ADT7470_REG_PWM_CFG(2), &pwm_cfg[1]);
222 /* set manual pwm to whatever it is set to now */
223 err = regmap_bulk_read(data->regmap, ADT7470_REG_PWM(0), &pwm[0],
228 /* put pwm in manual mode */
229 err = regmap_update_bits(data->regmap, ADT7470_REG_PWM_CFG(0),
230 ADT7470_PWM_AUTO_MASK, 0);
233 err = regmap_update_bits(data->regmap, ADT7470_REG_PWM_CFG(2),
234 ADT7470_PWM_AUTO_MASK, 0);
238 /* write pwm control to whatever it was */
239 err = regmap_bulk_write(data->regmap, ADT7470_REG_PWM(0), &pwm[0],
244 /* start reading temperature sensors */
245 err = regmap_update_bits(data->regmap, ADT7470_REG_CFG,
246 ADT7470_T05_STB_MASK, ADT7470_T05_STB_MASK);
250 /* Delay is 200ms * number of temp sensors. */
251 res = msleep_interruptible((data->num_temp_sensors >= 0 ?
252 data->num_temp_sensors * 200 :
253 TEMP_COLLECTION_TIME));
255 /* done reading temperature sensors */
256 err = regmap_update_bits(data->regmap, ADT7470_REG_CFG,
257 ADT7470_T05_STB_MASK, 0);
261 /* restore pwm[1-4] config registers */
262 err = regmap_write(data->regmap, ADT7470_REG_PWM_CFG(0), pwm_cfg[0]);
265 err = regmap_write(data->regmap, ADT7470_REG_PWM_CFG(2), pwm_cfg[1]);
272 /* Only count fans if we have to */
273 if (data->num_temp_sensors >= 0)
276 err = regmap_bulk_read(data->regmap, ADT7470_TEMP_REG(0), &data->temp[0],
280 for (i = 0; i < ADT7470_TEMP_COUNT; i++) {
282 data->num_temp_sensors = i + 1;
284 data->temperatures_probed = 1;
288 static int adt7470_update_thread(void *p)
290 struct i2c_client *client = p;
291 struct adt7470_data *data = i2c_get_clientdata(client);
293 while (!kthread_should_stop()) {
294 mutex_lock(&data->lock);
295 adt7470_read_temperatures(data);
296 mutex_unlock(&data->lock);
298 if (kthread_should_stop())
301 schedule_timeout_interruptible(msecs_to_jiffies(data->auto_update_interval));
307 static int adt7470_update_sensors(struct adt7470_data *data)
313 if (!data->temperatures_probed)
314 err = adt7470_read_temperatures(data);
316 err = regmap_bulk_read(data->regmap, ADT7470_TEMP_REG(0), &data->temp[0],
321 for (i = 0; i < ADT7470_FAN_COUNT; i++) {
322 err = adt7470_read_word_data(data, ADT7470_REG_FAN(i), &val);
328 err = regmap_bulk_read(data->regmap, ADT7470_REG_PWM(0), &data->pwm[0], ADT7470_PWM_COUNT);
332 for (i = 0; i < ADT7470_PWM_COUNT; i++) {
336 mask = ADT7470_PWM2_AUTO_MASK;
338 mask = ADT7470_PWM1_AUTO_MASK;
340 err = regmap_read(data->regmap, ADT7470_REG_PWM_CFG(i), &val);
343 data->pwm_automatic[i] = !!(val & mask);
345 err = regmap_read(data->regmap, ADT7470_REG_PWM_AUTO_TEMP(i), &val);
349 data->pwm_auto_temp[i] = val >> 4;
351 data->pwm_auto_temp[i] = val & 0xF;
354 err = regmap_read(data->regmap, ADT7470_REG_CFG, &val);
357 data->force_pwm_max = !!(val & ADT7470_FSPD_MASK);
359 err = regmap_read(data->regmap, ADT7470_REG_ALARM1, &val);
363 if (data->alarm & ADT7470_OOL_ALARM) {
364 err = regmap_read(data->regmap, ADT7470_REG_ALARM2, &val);
367 data->alarm |= ALARM2(val);
370 err = adt7470_read_word_data(data, ADT7470_REG_ALARM1_MASK, &val);
373 data->alarms_mask = val;
378 static int adt7470_update_limits(struct adt7470_data *data)
384 for (i = 0; i < ADT7470_TEMP_COUNT; i++) {
385 err = regmap_read(data->regmap, ADT7470_TEMP_MIN_REG(i), &val);
388 data->temp_min[i] = (s8)val;
389 err = regmap_read(data->regmap, ADT7470_TEMP_MAX_REG(i), &val);
392 data->temp_max[i] = (s8)val;
395 for (i = 0; i < ADT7470_FAN_COUNT; i++) {
396 err = adt7470_read_word_data(data, ADT7470_REG_FAN_MIN(i), &val);
399 data->fan_min[i] = val;
400 err = adt7470_read_word_data(data, ADT7470_REG_FAN_MAX(i), &val);
403 data->fan_max[i] = val;
406 for (i = 0; i < ADT7470_PWM_COUNT; i++) {
407 err = regmap_read(data->regmap, ADT7470_REG_PWM_MAX(i), &val);
410 data->pwm_max[i] = val;
411 err = regmap_read(data->regmap, ADT7470_REG_PWM_MIN(i), &val);
414 data->pwm_min[i] = val;
415 err = regmap_read(data->regmap, ADT7470_REG_PWM_TMIN(i), &val);
418 data->pwm_tmin[i] = (s8)val;
424 static struct adt7470_data *adt7470_update_device(struct device *dev)
426 struct adt7470_data *data = dev_get_drvdata(dev);
427 unsigned long local_jiffies = jiffies;
428 int need_sensors = 1;
433 * Figure out if we need to update the shadow registers.
434 * Lockless means that we may occasionally report out of
437 if (time_before(local_jiffies, data->sensors_last_updated +
438 SENSOR_REFRESH_INTERVAL) &&
442 if (time_before(local_jiffies, data->limits_last_updated +
443 LIMIT_REFRESH_INTERVAL) &&
447 if (!need_sensors && !need_limits)
450 mutex_lock(&data->lock);
452 err = adt7470_update_sensors(data);
455 data->sensors_last_updated = local_jiffies;
456 data->sensors_valid = 1;
460 err = adt7470_update_limits(data);
463 data->limits_last_updated = local_jiffies;
464 data->limits_valid = 1;
467 mutex_unlock(&data->lock);
469 return err < 0 ? ERR_PTR(err) : data;
472 static ssize_t auto_update_interval_show(struct device *dev,
473 struct device_attribute *devattr,
476 struct adt7470_data *data = adt7470_update_device(dev);
479 return PTR_ERR(data);
481 return sprintf(buf, "%d\n", data->auto_update_interval);
484 static ssize_t auto_update_interval_store(struct device *dev,
485 struct device_attribute *devattr,
486 const char *buf, size_t count)
488 struct adt7470_data *data = dev_get_drvdata(dev);
491 if (kstrtol(buf, 10, &temp))
494 temp = clamp_val(temp, 0, 60000);
496 mutex_lock(&data->lock);
497 data->auto_update_interval = temp;
498 mutex_unlock(&data->lock);
503 static ssize_t num_temp_sensors_show(struct device *dev,
504 struct device_attribute *devattr,
507 struct adt7470_data *data = adt7470_update_device(dev);
510 return PTR_ERR(data);
512 return sprintf(buf, "%d\n", data->num_temp_sensors);
515 static ssize_t num_temp_sensors_store(struct device *dev,
516 struct device_attribute *devattr,
517 const char *buf, size_t count)
519 struct adt7470_data *data = dev_get_drvdata(dev);
522 if (kstrtol(buf, 10, &temp))
525 temp = clamp_val(temp, -1, 10);
527 mutex_lock(&data->lock);
528 data->num_temp_sensors = temp;
530 data->temperatures_probed = 0;
531 mutex_unlock(&data->lock);
536 static int adt7470_temp_read(struct device *dev, u32 attr, int channel, long *val)
538 struct adt7470_data *data = adt7470_update_device(dev);
541 return PTR_ERR(data);
544 case hwmon_temp_input:
545 *val = 1000 * data->temp[channel];
548 *val = 1000 * data->temp_min[channel];
551 *val = 1000 * data->temp_max[channel];
553 case hwmon_temp_alarm:
554 *val = !!(data->alarm & channel);
563 static int adt7470_temp_write(struct device *dev, u32 attr, int channel, long val)
565 struct adt7470_data *data = dev_get_drvdata(dev);
568 val = clamp_val(val, -128000, 127000);
569 val = DIV_ROUND_CLOSEST(val, 1000);
573 mutex_lock(&data->lock);
574 data->temp_min[channel] = val;
575 err = regmap_write(data->regmap, ADT7470_TEMP_MIN_REG(channel), val);
576 mutex_unlock(&data->lock);
579 mutex_lock(&data->lock);
580 data->temp_max[channel] = val;
581 err = regmap_write(data->regmap, ADT7470_TEMP_MAX_REG(channel), val);
582 mutex_unlock(&data->lock);
591 static ssize_t alarm_mask_show(struct device *dev,
592 struct device_attribute *devattr, char *buf)
594 struct adt7470_data *data = adt7470_update_device(dev);
597 return PTR_ERR(data);
599 return sprintf(buf, "%x\n", data->alarms_mask);
602 static ssize_t alarm_mask_store(struct device *dev,
603 struct device_attribute *devattr,
604 const char *buf, size_t count)
606 struct adt7470_data *data = dev_get_drvdata(dev);
610 if (kstrtoul(buf, 0, &mask))
616 mutex_lock(&data->lock);
617 data->alarms_mask = mask;
618 err = adt7470_write_word_data(data, ADT7470_REG_ALARM1_MASK, mask);
619 mutex_unlock(&data->lock);
621 return err < 0 ? err : count;
624 static int adt7470_fan_read(struct device *dev, u32 attr, int channel, long *val)
626 struct adt7470_data *data = adt7470_update_device(dev);
629 return PTR_ERR(data);
632 case hwmon_fan_input:
633 if (FAN_DATA_VALID(data->fan[channel]))
634 *val = FAN_PERIOD_TO_RPM(data->fan[channel]);
639 if (FAN_DATA_VALID(data->fan_min[channel]))
640 *val = FAN_PERIOD_TO_RPM(data->fan_min[channel]);
645 if (FAN_DATA_VALID(data->fan_max[channel]))
646 *val = FAN_PERIOD_TO_RPM(data->fan_max[channel]);
650 case hwmon_fan_alarm:
651 *val = !!(data->alarm & (1 << (12 + channel)));
660 static int adt7470_fan_write(struct device *dev, u32 attr, int channel, long val)
662 struct adt7470_data *data = dev_get_drvdata(dev);
668 val = FAN_RPM_TO_PERIOD(val);
669 val = clamp_val(val, 1, 65534);
673 mutex_lock(&data->lock);
674 data->fan_min[channel] = val;
675 err = adt7470_write_word_data(data, ADT7470_REG_FAN_MIN(channel), val);
676 mutex_unlock(&data->lock);
679 mutex_lock(&data->lock);
680 data->fan_max[channel] = val;
681 err = adt7470_write_word_data(data, ADT7470_REG_FAN_MAX(channel), val);
682 mutex_unlock(&data->lock);
691 static ssize_t force_pwm_max_show(struct device *dev,
692 struct device_attribute *devattr, char *buf)
694 struct adt7470_data *data = adt7470_update_device(dev);
697 return PTR_ERR(data);
699 return sprintf(buf, "%d\n", data->force_pwm_max);
702 static ssize_t force_pwm_max_store(struct device *dev,
703 struct device_attribute *devattr,
704 const char *buf, size_t count)
706 struct adt7470_data *data = dev_get_drvdata(dev);
710 if (kstrtol(buf, 10, &temp))
713 mutex_lock(&data->lock);
714 data->force_pwm_max = temp;
715 err = regmap_update_bits(data->regmap, ADT7470_REG_CFG,
717 temp ? ADT7470_FSPD_MASK : 0);
718 mutex_unlock(&data->lock);
720 return err < 0 ? err : count;
723 /* These are the valid PWM frequencies to the nearest Hz */
724 static const int adt7470_freq_map[] = {
725 11, 15, 22, 29, 35, 44, 59, 88, 1400, 22500
728 static int pwm1_freq_get(struct device *dev)
730 struct adt7470_data *data = dev_get_drvdata(dev);
731 unsigned int cfg_reg_1, cfg_reg_2;
735 mutex_lock(&data->lock);
736 err = regmap_read(data->regmap, ADT7470_REG_CFG, &cfg_reg_1);
739 err = regmap_read(data->regmap, ADT7470_REG_CFG_2, &cfg_reg_2);
742 mutex_unlock(&data->lock);
744 index = (cfg_reg_2 & ADT7470_FREQ_MASK) >> ADT7470_FREQ_SHIFT;
745 if (!(cfg_reg_1 & ADT7470_CFG_LF))
747 if (index >= ARRAY_SIZE(adt7470_freq_map))
748 index = ARRAY_SIZE(adt7470_freq_map) - 1;
750 return adt7470_freq_map[index];
753 mutex_unlock(&data->lock);
757 static int adt7470_pwm_read(struct device *dev, u32 attr, int channel, long *val)
759 struct adt7470_data *data = adt7470_update_device(dev);
762 return PTR_ERR(data);
765 case hwmon_pwm_input:
766 *val = data->pwm[channel];
768 case hwmon_pwm_enable:
769 *val = 1 + data->pwm_automatic[channel];
772 *val = pwm1_freq_get(dev);
781 static int pwm1_freq_set(struct device *dev, long freq)
783 struct adt7470_data *data = dev_get_drvdata(dev);
784 unsigned int low_freq = ADT7470_CFG_LF;
788 /* Round the user value given to the closest available frequency */
789 index = find_closest(freq, adt7470_freq_map,
790 ARRAY_SIZE(adt7470_freq_map));
797 mutex_lock(&data->lock);
798 /* Configuration Register 1 */
799 err = regmap_update_bits(data->regmap, ADT7470_REG_CFG,
800 ADT7470_CFG_LF, low_freq);
804 /* Configuration Register 2 */
805 err = regmap_update_bits(data->regmap, ADT7470_REG_CFG_2,
807 index << ADT7470_FREQ_SHIFT);
809 mutex_unlock(&data->lock);
814 static int adt7470_pwm_write(struct device *dev, u32 attr, int channel, long val)
816 struct adt7470_data *data = dev_get_drvdata(dev);
817 unsigned int pwm_auto_reg_mask;
821 case hwmon_pwm_input:
822 val = clamp_val(val, 0, 255);
823 mutex_lock(&data->lock);
824 data->pwm[channel] = val;
825 err = regmap_write(data->regmap, ADT7470_REG_PWM(channel),
827 mutex_unlock(&data->lock);
829 case hwmon_pwm_enable:
831 pwm_auto_reg_mask = ADT7470_PWM2_AUTO_MASK;
833 pwm_auto_reg_mask = ADT7470_PWM1_AUTO_MASK;
835 if (val != 2 && val != 1)
839 mutex_lock(&data->lock);
840 data->pwm_automatic[channel] = val;
841 err = regmap_update_bits(data->regmap, ADT7470_REG_PWM_CFG(channel),
843 val ? pwm_auto_reg_mask : 0);
844 mutex_unlock(&data->lock);
847 err = pwm1_freq_set(dev, val);
856 static ssize_t pwm_max_show(struct device *dev,
857 struct device_attribute *devattr, char *buf)
859 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
860 struct adt7470_data *data = adt7470_update_device(dev);
863 return PTR_ERR(data);
865 return sprintf(buf, "%d\n", data->pwm_max[attr->index]);
868 static ssize_t pwm_max_store(struct device *dev,
869 struct device_attribute *devattr,
870 const char *buf, size_t count)
872 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
873 struct adt7470_data *data = dev_get_drvdata(dev);
877 if (kstrtol(buf, 10, &temp))
880 temp = clamp_val(temp, 0, 255);
882 mutex_lock(&data->lock);
883 data->pwm_max[attr->index] = temp;
884 err = regmap_write(data->regmap, ADT7470_REG_PWM_MAX(attr->index),
886 mutex_unlock(&data->lock);
888 return err < 0 ? err : count;
891 static ssize_t pwm_min_show(struct device *dev,
892 struct device_attribute *devattr, char *buf)
894 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
895 struct adt7470_data *data = adt7470_update_device(dev);
898 return PTR_ERR(data);
900 return sprintf(buf, "%d\n", data->pwm_min[attr->index]);
903 static ssize_t pwm_min_store(struct device *dev,
904 struct device_attribute *devattr,
905 const char *buf, size_t count)
907 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
908 struct adt7470_data *data = dev_get_drvdata(dev);
912 if (kstrtol(buf, 10, &temp))
915 temp = clamp_val(temp, 0, 255);
917 mutex_lock(&data->lock);
918 data->pwm_min[attr->index] = temp;
919 err = regmap_write(data->regmap, ADT7470_REG_PWM_MIN(attr->index),
921 mutex_unlock(&data->lock);
923 return err < 0 ? err : count;
926 static ssize_t pwm_tmax_show(struct device *dev,
927 struct device_attribute *devattr, char *buf)
929 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
930 struct adt7470_data *data = adt7470_update_device(dev);
933 return PTR_ERR(data);
935 /* the datasheet says that tmax = tmin + 20C */
936 return sprintf(buf, "%d\n", 1000 * (20 + data->pwm_tmin[attr->index]));
939 static ssize_t pwm_tmin_show(struct device *dev,
940 struct device_attribute *devattr, char *buf)
942 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
943 struct adt7470_data *data = adt7470_update_device(dev);
946 return PTR_ERR(data);
948 return sprintf(buf, "%d\n", 1000 * data->pwm_tmin[attr->index]);
951 static ssize_t pwm_tmin_store(struct device *dev,
952 struct device_attribute *devattr,
953 const char *buf, size_t count)
955 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
956 struct adt7470_data *data = dev_get_drvdata(dev);
960 if (kstrtol(buf, 10, &temp))
963 temp = clamp_val(temp, -128000, 127000);
964 temp = DIV_ROUND_CLOSEST(temp, 1000);
966 mutex_lock(&data->lock);
967 data->pwm_tmin[attr->index] = temp;
968 err = regmap_write(data->regmap, ADT7470_REG_PWM_TMIN(attr->index),
970 mutex_unlock(&data->lock);
972 return err < 0 ? err : count;
975 static ssize_t pwm_auto_temp_show(struct device *dev,
976 struct device_attribute *devattr, char *buf)
978 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
979 struct adt7470_data *data = adt7470_update_device(dev);
983 return PTR_ERR(data);
985 ctrl = data->pwm_auto_temp[attr->index];
987 return sprintf(buf, "%d\n", 1 << (ctrl - 1));
989 return sprintf(buf, "%d\n", ADT7470_PWM_ALL_TEMPS);
992 static int cvt_auto_temp(int input)
994 if (input == ADT7470_PWM_ALL_TEMPS)
996 if (input < 1 || !is_power_of_2(input))
998 return ilog2(input) + 1;
1001 static ssize_t pwm_auto_temp_store(struct device *dev,
1002 struct device_attribute *devattr,
1003 const char *buf, size_t count)
1005 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
1006 struct adt7470_data *data = dev_get_drvdata(dev);
1007 int pwm_auto_reg = ADT7470_REG_PWM_AUTO_TEMP(attr->index);
1008 unsigned int mask, val;
1012 if (kstrtol(buf, 10, &temp))
1015 temp = cvt_auto_temp(temp);
1019 mutex_lock(&data->lock);
1020 data->pwm_automatic[attr->index] = temp;
1022 if (!(attr->index % 2)) {
1024 val = (temp << 4) & 0xF0;
1030 err = regmap_update_bits(data->regmap, pwm_auto_reg, mask, val);
1031 mutex_unlock(&data->lock);
1033 return err < 0 ? err : count;
1036 static DEVICE_ATTR_RW(alarm_mask);
1037 static DEVICE_ATTR_RW(num_temp_sensors);
1038 static DEVICE_ATTR_RW(auto_update_interval);
1040 static SENSOR_DEVICE_ATTR_RW(force_pwm_max, force_pwm_max, 0);
1042 static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point1_pwm, pwm_min, 0);
1043 static SENSOR_DEVICE_ATTR_RW(pwm2_auto_point1_pwm, pwm_min, 1);
1044 static SENSOR_DEVICE_ATTR_RW(pwm3_auto_point1_pwm, pwm_min, 2);
1045 static SENSOR_DEVICE_ATTR_RW(pwm4_auto_point1_pwm, pwm_min, 3);
1047 static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point2_pwm, pwm_max, 0);
1048 static SENSOR_DEVICE_ATTR_RW(pwm2_auto_point2_pwm, pwm_max, 1);
1049 static SENSOR_DEVICE_ATTR_RW(pwm3_auto_point2_pwm, pwm_max, 2);
1050 static SENSOR_DEVICE_ATTR_RW(pwm4_auto_point2_pwm, pwm_max, 3);
1052 static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point1_temp, pwm_tmin, 0);
1053 static SENSOR_DEVICE_ATTR_RW(pwm2_auto_point1_temp, pwm_tmin, 1);
1054 static SENSOR_DEVICE_ATTR_RW(pwm3_auto_point1_temp, pwm_tmin, 2);
1055 static SENSOR_DEVICE_ATTR_RW(pwm4_auto_point1_temp, pwm_tmin, 3);
1057 static SENSOR_DEVICE_ATTR_RO(pwm1_auto_point2_temp, pwm_tmax, 0);
1058 static SENSOR_DEVICE_ATTR_RO(pwm2_auto_point2_temp, pwm_tmax, 1);
1059 static SENSOR_DEVICE_ATTR_RO(pwm3_auto_point2_temp, pwm_tmax, 2);
1060 static SENSOR_DEVICE_ATTR_RO(pwm4_auto_point2_temp, pwm_tmax, 3);
1062 static SENSOR_DEVICE_ATTR_RW(pwm1_auto_channels_temp, pwm_auto_temp, 0);
1063 static SENSOR_DEVICE_ATTR_RW(pwm2_auto_channels_temp, pwm_auto_temp, 1);
1064 static SENSOR_DEVICE_ATTR_RW(pwm3_auto_channels_temp, pwm_auto_temp, 2);
1065 static SENSOR_DEVICE_ATTR_RW(pwm4_auto_channels_temp, pwm_auto_temp, 3);
1067 static struct attribute *adt7470_attrs[] = {
1068 &dev_attr_alarm_mask.attr,
1069 &dev_attr_num_temp_sensors.attr,
1070 &dev_attr_auto_update_interval.attr,
1071 &sensor_dev_attr_force_pwm_max.dev_attr.attr,
1072 &sensor_dev_attr_pwm1_auto_point1_pwm.dev_attr.attr,
1073 &sensor_dev_attr_pwm2_auto_point1_pwm.dev_attr.attr,
1074 &sensor_dev_attr_pwm3_auto_point1_pwm.dev_attr.attr,
1075 &sensor_dev_attr_pwm4_auto_point1_pwm.dev_attr.attr,
1076 &sensor_dev_attr_pwm1_auto_point2_pwm.dev_attr.attr,
1077 &sensor_dev_attr_pwm2_auto_point2_pwm.dev_attr.attr,
1078 &sensor_dev_attr_pwm3_auto_point2_pwm.dev_attr.attr,
1079 &sensor_dev_attr_pwm4_auto_point2_pwm.dev_attr.attr,
1080 &sensor_dev_attr_pwm1_auto_point1_temp.dev_attr.attr,
1081 &sensor_dev_attr_pwm2_auto_point1_temp.dev_attr.attr,
1082 &sensor_dev_attr_pwm3_auto_point1_temp.dev_attr.attr,
1083 &sensor_dev_attr_pwm4_auto_point1_temp.dev_attr.attr,
1084 &sensor_dev_attr_pwm1_auto_point2_temp.dev_attr.attr,
1085 &sensor_dev_attr_pwm2_auto_point2_temp.dev_attr.attr,
1086 &sensor_dev_attr_pwm3_auto_point2_temp.dev_attr.attr,
1087 &sensor_dev_attr_pwm4_auto_point2_temp.dev_attr.attr,
1088 &sensor_dev_attr_pwm1_auto_channels_temp.dev_attr.attr,
1089 &sensor_dev_attr_pwm2_auto_channels_temp.dev_attr.attr,
1090 &sensor_dev_attr_pwm3_auto_channels_temp.dev_attr.attr,
1091 &sensor_dev_attr_pwm4_auto_channels_temp.dev_attr.attr,
1095 ATTRIBUTE_GROUPS(adt7470);
1097 static int adt7470_read(struct device *dev, enum hwmon_sensor_types type, u32 attr,
1098 int channel, long *val)
1102 return adt7470_temp_read(dev, attr, channel, val);
1104 return adt7470_fan_read(dev, attr, channel, val);
1106 return adt7470_pwm_read(dev, attr, channel, val);
1112 static int adt7470_write(struct device *dev, enum hwmon_sensor_types type, u32 attr,
1113 int channel, long val)
1117 return adt7470_temp_write(dev, attr, channel, val);
1119 return adt7470_fan_write(dev, attr, channel, val);
1121 return adt7470_pwm_write(dev, attr, channel, val);
1127 static umode_t adt7470_is_visible(const void *_data, enum hwmon_sensor_types type,
1128 u32 attr, int channel)
1136 case hwmon_temp_alarm:
1139 case hwmon_temp_min:
1140 case hwmon_temp_max:
1149 case hwmon_fan_input:
1150 case hwmon_fan_alarm:
1163 case hwmon_pwm_input:
1164 case hwmon_pwm_enable:
1167 case hwmon_pwm_freq:
1184 static const struct hwmon_ops adt7470_hwmon_ops = {
1185 .is_visible = adt7470_is_visible,
1186 .read = adt7470_read,
1187 .write = adt7470_write,
1190 static const struct hwmon_channel_info * const adt7470_info[] = {
1191 HWMON_CHANNEL_INFO(temp,
1192 HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX | HWMON_T_ALARM,
1193 HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX | HWMON_T_ALARM,
1194 HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX | HWMON_T_ALARM,
1195 HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX | HWMON_T_ALARM,
1196 HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX | HWMON_T_ALARM,
1197 HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX | HWMON_T_ALARM,
1198 HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX | HWMON_T_ALARM,
1199 HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX | HWMON_T_ALARM,
1200 HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX | HWMON_T_ALARM,
1201 HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX | HWMON_T_ALARM),
1202 HWMON_CHANNEL_INFO(fan,
1203 HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX | HWMON_F_DIV | HWMON_F_ALARM,
1204 HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX | HWMON_F_DIV | HWMON_F_ALARM,
1205 HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX | HWMON_F_DIV | HWMON_F_ALARM,
1206 HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX | HWMON_F_DIV | HWMON_F_ALARM),
1207 HWMON_CHANNEL_INFO(pwm,
1208 HWMON_PWM_INPUT | HWMON_PWM_ENABLE | HWMON_PWM_FREQ,
1209 HWMON_PWM_INPUT | HWMON_PWM_ENABLE,
1210 HWMON_PWM_INPUT | HWMON_PWM_ENABLE,
1211 HWMON_PWM_INPUT | HWMON_PWM_ENABLE),
1215 static const struct hwmon_chip_info adt7470_chip_info = {
1216 .ops = &adt7470_hwmon_ops,
1217 .info = adt7470_info,
1220 /* Return 0 if detection is successful, -ENODEV otherwise */
1221 static int adt7470_detect(struct i2c_client *client,
1222 struct i2c_board_info *info)
1224 struct i2c_adapter *adapter = client->adapter;
1225 int vendor, device, revision;
1227 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
1230 vendor = i2c_smbus_read_byte_data(client, ADT7470_REG_VENDOR);
1231 if (vendor != ADT7470_VENDOR)
1234 device = i2c_smbus_read_byte_data(client, ADT7470_REG_DEVICE);
1235 if (device != ADT7470_DEVICE)
1238 revision = i2c_smbus_read_byte_data(client, ADT7470_REG_REVISION);
1239 if (revision != ADT7470_REVISION)
1242 strscpy(info->type, "adt7470", I2C_NAME_SIZE);
1247 static const struct regmap_config adt7470_regmap_config = {
1250 .use_single_read = true,
1251 .use_single_write = true,
1254 static int adt7470_probe(struct i2c_client *client)
1256 struct device *dev = &client->dev;
1257 struct adt7470_data *data;
1258 struct device *hwmon_dev;
1261 data = devm_kzalloc(dev, sizeof(struct adt7470_data), GFP_KERNEL);
1265 data->num_temp_sensors = -1;
1266 data->auto_update_interval = AUTO_UPDATE_INTERVAL;
1267 data->regmap = devm_regmap_init_i2c(client, &adt7470_regmap_config);
1268 if (IS_ERR(data->regmap))
1269 return PTR_ERR(data->regmap);
1271 i2c_set_clientdata(client, data);
1272 mutex_init(&data->lock);
1274 dev_info(&client->dev, "%s chip found\n", client->name);
1276 /* Initialize the ADT7470 chip */
1277 err = regmap_update_bits(data->regmap, ADT7470_REG_CFG,
1278 ADT7470_STRT_MASK | ADT7470_TEST_MASK,
1279 ADT7470_STRT_MASK | ADT7470_TEST_MASK);
1283 /* Register sysfs hooks */
1284 hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, data,
1288 if (IS_ERR(hwmon_dev))
1289 return PTR_ERR(hwmon_dev);
1291 data->auto_update = kthread_run(adt7470_update_thread, client, "%s",
1292 dev_name(hwmon_dev));
1293 if (IS_ERR(data->auto_update))
1294 return PTR_ERR(data->auto_update);
1299 static void adt7470_remove(struct i2c_client *client)
1301 struct adt7470_data *data = i2c_get_clientdata(client);
1303 kthread_stop(data->auto_update);
1306 static const struct i2c_device_id adt7470_id[] = {
1310 MODULE_DEVICE_TABLE(i2c, adt7470_id);
1312 static struct i2c_driver adt7470_driver = {
1313 .class = I2C_CLASS_HWMON,
1317 .probe = adt7470_probe,
1318 .remove = adt7470_remove,
1319 .id_table = adt7470_id,
1320 .detect = adt7470_detect,
1321 .address_list = normal_i2c,
1324 module_i2c_driver(adt7470_driver);
1326 MODULE_AUTHOR("Darrick J. Wong <darrick.wong@oracle.com>");
1327 MODULE_DESCRIPTION("ADT7470 driver");
1328 MODULE_LICENSE("GPL");