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/slab.h>
23 #include <linux/util_macros.h>
25 /* Addresses to scan */
26 static const unsigned short normal_i2c[] = { 0x2C, 0x2E, 0x2F, I2C_CLIENT_END };
28 /* ADT7470 registers */
29 #define ADT7470_REG_BASE_ADDR 0x20
30 #define ADT7470_REG_TEMP_BASE_ADDR 0x20
31 #define ADT7470_REG_TEMP_MAX_ADDR 0x29
32 #define ADT7470_REG_FAN_BASE_ADDR 0x2A
33 #define ADT7470_REG_FAN_MAX_ADDR 0x31
34 #define ADT7470_REG_PWM_BASE_ADDR 0x32
35 #define ADT7470_REG_PWM_MAX_ADDR 0x35
36 #define ADT7470_REG_PWM_MAX_BASE_ADDR 0x38
37 #define ADT7470_REG_PWM_MAX_MAX_ADDR 0x3B
38 #define ADT7470_REG_CFG 0x40
39 #define ADT7470_STRT_MASK 0x01
40 #define ADT7470_TEST_MASK 0x02
41 #define ADT7470_FSPD_MASK 0x04
42 #define ADT7470_T05_STB_MASK 0x80
43 #define ADT7470_REG_ALARM1 0x41
44 #define ADT7470_R1T_ALARM 0x01
45 #define ADT7470_R2T_ALARM 0x02
46 #define ADT7470_R3T_ALARM 0x04
47 #define ADT7470_R4T_ALARM 0x08
48 #define ADT7470_R5T_ALARM 0x10
49 #define ADT7470_R6T_ALARM 0x20
50 #define ADT7470_R7T_ALARM 0x40
51 #define ADT7470_OOL_ALARM 0x80
52 #define ADT7470_REG_ALARM2 0x42
53 #define ADT7470_R8T_ALARM 0x01
54 #define ADT7470_R9T_ALARM 0x02
55 #define ADT7470_R10T_ALARM 0x04
56 #define ADT7470_FAN1_ALARM 0x10
57 #define ADT7470_FAN2_ALARM 0x20
58 #define ADT7470_FAN3_ALARM 0x40
59 #define ADT7470_FAN4_ALARM 0x80
60 #define ADT7470_REG_TEMP_LIMITS_BASE_ADDR 0x44
61 #define ADT7470_REG_TEMP_LIMITS_MAX_ADDR 0x57
62 #define ADT7470_REG_FAN_MIN_BASE_ADDR 0x58
63 #define ADT7470_REG_FAN_MIN_MAX_ADDR 0x5F
64 #define ADT7470_REG_FAN_MAX_BASE_ADDR 0x60
65 #define ADT7470_REG_FAN_MAX_MAX_ADDR 0x67
66 #define ADT7470_REG_PWM_CFG_BASE_ADDR 0x68
67 #define ADT7470_REG_PWM12_CFG 0x68
68 #define ADT7470_PWM2_AUTO_MASK 0x40
69 #define ADT7470_PWM1_AUTO_MASK 0x80
70 #define ADT7470_PWM_AUTO_MASK 0xC0
71 #define ADT7470_REG_PWM34_CFG 0x69
72 #define ADT7470_PWM3_AUTO_MASK 0x40
73 #define ADT7470_PWM4_AUTO_MASK 0x80
74 #define ADT7470_REG_PWM_MIN_BASE_ADDR 0x6A
75 #define ADT7470_REG_PWM_MIN_MAX_ADDR 0x6D
76 #define ADT7470_REG_PWM_TEMP_MIN_BASE_ADDR 0x6E
77 #define ADT7470_REG_PWM_TEMP_MIN_MAX_ADDR 0x71
78 #define ADT7470_REG_CFG_2 0x74
79 #define ADT7470_REG_ACOUSTICS12 0x75
80 #define ADT7470_REG_ACOUSTICS34 0x76
81 #define ADT7470_REG_DEVICE 0x3D
82 #define ADT7470_REG_VENDOR 0x3E
83 #define ADT7470_REG_REVISION 0x3F
84 #define ADT7470_REG_ALARM1_MASK 0x72
85 #define ADT7470_REG_ALARM2_MASK 0x73
86 #define ADT7470_REG_PWM_AUTO_TEMP_BASE_ADDR 0x7C
87 #define ADT7470_REG_PWM_AUTO_TEMP_MAX_ADDR 0x7D
88 #define ADT7470_REG_MAX_ADDR 0x81
90 #define ADT7470_TEMP_COUNT 10
91 #define ADT7470_TEMP_REG(x) (ADT7470_REG_TEMP_BASE_ADDR + (x))
92 #define ADT7470_TEMP_MIN_REG(x) (ADT7470_REG_TEMP_LIMITS_BASE_ADDR + ((x) * 2))
93 #define ADT7470_TEMP_MAX_REG(x) (ADT7470_REG_TEMP_LIMITS_BASE_ADDR + \
96 #define ADT7470_FAN_COUNT 4
97 #define ADT7470_REG_FAN(x) (ADT7470_REG_FAN_BASE_ADDR + ((x) * 2))
98 #define ADT7470_REG_FAN_MIN(x) (ADT7470_REG_FAN_MIN_BASE_ADDR + ((x) * 2))
99 #define ADT7470_REG_FAN_MAX(x) (ADT7470_REG_FAN_MAX_BASE_ADDR + ((x) * 2))
101 #define ADT7470_PWM_COUNT 4
102 #define ADT7470_REG_PWM(x) (ADT7470_REG_PWM_BASE_ADDR + (x))
103 #define ADT7470_REG_PWM_MAX(x) (ADT7470_REG_PWM_MAX_BASE_ADDR + (x))
104 #define ADT7470_REG_PWM_MIN(x) (ADT7470_REG_PWM_MIN_BASE_ADDR + (x))
105 #define ADT7470_REG_PWM_TMIN(x) (ADT7470_REG_PWM_TEMP_MIN_BASE_ADDR + (x))
106 #define ADT7470_REG_PWM_CFG(x) (ADT7470_REG_PWM_CFG_BASE_ADDR + ((x) / 2))
107 #define ADT7470_REG_PWM_AUTO_TEMP(x) (ADT7470_REG_PWM_AUTO_TEMP_BASE_ADDR + \
110 #define ALARM2(x) ((x) << 8)
112 #define ADT7470_VENDOR 0x41
113 #define ADT7470_DEVICE 0x70
114 /* datasheet only mentions a revision 2 */
115 #define ADT7470_REVISION 0x02
117 /* "all temps" according to hwmon sysfs interface spec */
118 #define ADT7470_PWM_ALL_TEMPS 0x3FF
120 /* How often do we reread sensors values? (In jiffies) */
121 #define SENSOR_REFRESH_INTERVAL (5 * HZ)
123 /* How often do we reread sensor limit values? (In jiffies) */
124 #define LIMIT_REFRESH_INTERVAL (60 * HZ)
126 /* Wait at least 200ms per sensor for 10 sensors */
127 #define TEMP_COLLECTION_TIME 2000
129 /* auto update thing won't fire more than every 2s */
130 #define AUTO_UPDATE_INTERVAL 2000
132 /* datasheet says to divide this number by the fan reading to get fan rpm */
133 #define FAN_PERIOD_TO_RPM(x) ((90000 * 60) / (x))
134 #define FAN_RPM_TO_PERIOD FAN_PERIOD_TO_RPM
135 #define FAN_PERIOD_INVALID 65535
136 #define FAN_DATA_VALID(x) ((x) && (x) != FAN_PERIOD_INVALID)
138 /* Config registers 1 and 2 include fields for selecting the PWM frequency */
139 #define ADT7470_CFG_LF 0x40
140 #define ADT7470_FREQ_MASK 0x70
141 #define ADT7470_FREQ_SHIFT 4
143 struct adt7470_data {
144 struct regmap *regmap;
148 unsigned long sensors_last_updated; /* In jiffies */
149 unsigned long limits_last_updated; /* In jiffies */
151 int num_temp_sensors; /* -1 = probe */
152 int temperatures_probed;
154 s8 temp[ADT7470_TEMP_COUNT];
155 s8 temp_min[ADT7470_TEMP_COUNT];
156 s8 temp_max[ADT7470_TEMP_COUNT];
157 u16 fan[ADT7470_FAN_COUNT];
158 u16 fan_min[ADT7470_FAN_COUNT];
159 u16 fan_max[ADT7470_FAN_COUNT];
163 u8 pwm[ADT7470_PWM_COUNT];
164 u8 pwm_max[ADT7470_PWM_COUNT];
165 u8 pwm_automatic[ADT7470_PWM_COUNT];
166 u8 pwm_min[ADT7470_PWM_COUNT];
167 s8 pwm_tmin[ADT7470_PWM_COUNT];
168 u8 pwm_auto_temp[ADT7470_PWM_COUNT];
170 struct task_struct *auto_update;
171 unsigned int auto_update_interval;
175 * 16-bit registers on the ADT7470 are low-byte first. The data sheet says
176 * that the low byte must be read before the high byte.
178 static inline int adt7470_read_word_data(struct adt7470_data *data, unsigned int reg,
184 err = regmap_bulk_read(data->regmap, reg, ®val, 2);
188 *val = regval[0] | (regval[1] << 8);
193 static inline int adt7470_write_word_data(struct adt7470_data *data, unsigned int reg,
198 regval[0] = val & 0xFF;
199 regval[1] = val >> 8;
201 return regmap_bulk_write(data->regmap, reg, ®val, 2);
204 /* Probe for temperature sensors. Assumes lock is held */
205 static int adt7470_read_temperatures(struct adt7470_data *data)
208 unsigned int pwm_cfg[2];
211 u8 pwm[ADT7470_FAN_COUNT];
213 /* save pwm[1-4] config register */
214 err = regmap_read(data->regmap, ADT7470_REG_PWM_CFG(0), &pwm_cfg[0]);
217 err = regmap_read(data->regmap, ADT7470_REG_PWM_CFG(2), &pwm_cfg[1]);
221 /* set manual pwm to whatever it is set to now */
222 err = regmap_bulk_read(data->regmap, ADT7470_REG_PWM(0), &pwm[0],
227 /* put pwm in manual mode */
228 err = regmap_update_bits(data->regmap, ADT7470_REG_PWM_CFG(0),
229 ADT7470_PWM_AUTO_MASK, 0);
232 err = regmap_update_bits(data->regmap, ADT7470_REG_PWM_CFG(2),
233 ADT7470_PWM_AUTO_MASK, 0);
237 /* write pwm control to whatever it was */
238 err = regmap_bulk_write(data->regmap, ADT7470_REG_PWM(0), &pwm[0],
243 /* start reading temperature sensors */
244 err = regmap_update_bits(data->regmap, ADT7470_REG_CFG,
245 ADT7470_T05_STB_MASK, ADT7470_T05_STB_MASK);
249 /* Delay is 200ms * number of temp sensors. */
250 res = msleep_interruptible((data->num_temp_sensors >= 0 ?
251 data->num_temp_sensors * 200 :
252 TEMP_COLLECTION_TIME));
254 /* done reading temperature sensors */
255 err = regmap_update_bits(data->regmap, ADT7470_REG_CFG,
256 ADT7470_T05_STB_MASK, 0);
260 /* restore pwm[1-4] config registers */
261 err = regmap_write(data->regmap, ADT7470_REG_PWM_CFG(0), pwm_cfg[0]);
264 err = regmap_write(data->regmap, ADT7470_REG_PWM_CFG(2), pwm_cfg[1]);
271 /* Only count fans if we have to */
272 if (data->num_temp_sensors >= 0)
275 err = regmap_bulk_read(data->regmap, ADT7470_TEMP_REG(0), &data->temp[0],
279 for (i = 0; i < ADT7470_TEMP_COUNT; i++) {
281 data->num_temp_sensors = i + 1;
283 data->temperatures_probed = 1;
287 static int adt7470_update_thread(void *p)
289 struct i2c_client *client = p;
290 struct adt7470_data *data = i2c_get_clientdata(client);
292 while (!kthread_should_stop()) {
293 mutex_lock(&data->lock);
294 adt7470_read_temperatures(data);
295 mutex_unlock(&data->lock);
297 set_current_state(TASK_INTERRUPTIBLE);
298 if (kthread_should_stop())
301 schedule_timeout(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);
665 val = FAN_RPM_TO_PERIOD(val);
666 val = clamp_val(val, 1, 65534);
670 mutex_lock(&data->lock);
671 data->fan_min[channel] = val;
672 err = adt7470_write_word_data(data, ADT7470_REG_FAN_MIN(channel), val);
673 mutex_unlock(&data->lock);
676 mutex_lock(&data->lock);
677 data->fan_max[channel] = val;
678 err = adt7470_write_word_data(data, ADT7470_REG_FAN_MAX(channel), val);
679 mutex_unlock(&data->lock);
688 static ssize_t force_pwm_max_show(struct device *dev,
689 struct device_attribute *devattr, char *buf)
691 struct adt7470_data *data = adt7470_update_device(dev);
694 return PTR_ERR(data);
696 return sprintf(buf, "%d\n", data->force_pwm_max);
699 static ssize_t force_pwm_max_store(struct device *dev,
700 struct device_attribute *devattr,
701 const char *buf, size_t count)
703 struct adt7470_data *data = dev_get_drvdata(dev);
707 if (kstrtol(buf, 10, &temp))
710 mutex_lock(&data->lock);
711 data->force_pwm_max = temp;
712 err = regmap_update_bits(data->regmap, ADT7470_REG_CFG,
714 temp ? ADT7470_FSPD_MASK : 0);
715 mutex_unlock(&data->lock);
717 return err < 0 ? err : count;
720 /* These are the valid PWM frequencies to the nearest Hz */
721 static const int adt7470_freq_map[] = {
722 11, 15, 22, 29, 35, 44, 59, 88, 1400, 22500
725 static int pwm1_freq_get(struct device *dev)
727 struct adt7470_data *data = dev_get_drvdata(dev);
728 unsigned int cfg_reg_1, cfg_reg_2;
732 mutex_lock(&data->lock);
733 err = regmap_read(data->regmap, ADT7470_REG_CFG, &cfg_reg_1);
736 err = regmap_read(data->regmap, ADT7470_REG_CFG_2, &cfg_reg_2);
739 mutex_unlock(&data->lock);
741 index = (cfg_reg_2 & ADT7470_FREQ_MASK) >> ADT7470_FREQ_SHIFT;
742 if (!(cfg_reg_1 & ADT7470_CFG_LF))
744 if (index >= ARRAY_SIZE(adt7470_freq_map))
745 index = ARRAY_SIZE(adt7470_freq_map) - 1;
747 return adt7470_freq_map[index];
750 mutex_unlock(&data->lock);
754 static int adt7470_pwm_read(struct device *dev, u32 attr, int channel, long *val)
756 struct adt7470_data *data = adt7470_update_device(dev);
759 return PTR_ERR(data);
762 case hwmon_pwm_input:
763 *val = data->pwm[channel];
765 case hwmon_pwm_enable:
766 *val = 1 + data->pwm_automatic[channel];
769 *val = pwm1_freq_get(dev);
778 static int pwm1_freq_set(struct device *dev, long freq)
780 struct adt7470_data *data = dev_get_drvdata(dev);
781 unsigned int low_freq = ADT7470_CFG_LF;
785 /* Round the user value given to the closest available frequency */
786 index = find_closest(freq, adt7470_freq_map,
787 ARRAY_SIZE(adt7470_freq_map));
794 mutex_lock(&data->lock);
795 /* Configuration Register 1 */
796 err = regmap_update_bits(data->regmap, ADT7470_REG_CFG,
797 ADT7470_CFG_LF, low_freq);
801 /* Configuration Register 2 */
802 err = regmap_update_bits(data->regmap, ADT7470_REG_CFG_2,
804 index << ADT7470_FREQ_SHIFT);
806 mutex_unlock(&data->lock);
811 static int adt7470_pwm_write(struct device *dev, u32 attr, int channel, long val)
813 struct adt7470_data *data = dev_get_drvdata(dev);
814 unsigned int pwm_auto_reg_mask;
818 case hwmon_pwm_input:
819 val = clamp_val(val, 0, 255);
820 mutex_lock(&data->lock);
821 data->pwm[channel] = val;
822 err = regmap_write(data->regmap, ADT7470_REG_PWM(channel),
824 mutex_unlock(&data->lock);
826 case hwmon_pwm_enable:
828 pwm_auto_reg_mask = ADT7470_PWM2_AUTO_MASK;
830 pwm_auto_reg_mask = ADT7470_PWM1_AUTO_MASK;
832 if (val != 2 && val != 1)
836 mutex_lock(&data->lock);
837 data->pwm_automatic[channel] = val;
838 err = regmap_update_bits(data->regmap, ADT7470_REG_PWM_CFG(channel),
840 val ? pwm_auto_reg_mask : 0);
841 mutex_unlock(&data->lock);
844 err = pwm1_freq_set(dev, val);
853 static ssize_t pwm_max_show(struct device *dev,
854 struct device_attribute *devattr, char *buf)
856 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
857 struct adt7470_data *data = adt7470_update_device(dev);
860 return PTR_ERR(data);
862 return sprintf(buf, "%d\n", data->pwm_max[attr->index]);
865 static ssize_t pwm_max_store(struct device *dev,
866 struct device_attribute *devattr,
867 const char *buf, size_t count)
869 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
870 struct adt7470_data *data = dev_get_drvdata(dev);
874 if (kstrtol(buf, 10, &temp))
877 temp = clamp_val(temp, 0, 255);
879 mutex_lock(&data->lock);
880 data->pwm_max[attr->index] = temp;
881 err = regmap_write(data->regmap, ADT7470_REG_PWM_MAX(attr->index),
883 mutex_unlock(&data->lock);
885 return err < 0 ? err : count;
888 static ssize_t pwm_min_show(struct device *dev,
889 struct device_attribute *devattr, char *buf)
891 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
892 struct adt7470_data *data = adt7470_update_device(dev);
895 return PTR_ERR(data);
897 return sprintf(buf, "%d\n", data->pwm_min[attr->index]);
900 static ssize_t pwm_min_store(struct device *dev,
901 struct device_attribute *devattr,
902 const char *buf, size_t count)
904 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
905 struct adt7470_data *data = dev_get_drvdata(dev);
909 if (kstrtol(buf, 10, &temp))
912 temp = clamp_val(temp, 0, 255);
914 mutex_lock(&data->lock);
915 data->pwm_min[attr->index] = temp;
916 err = regmap_write(data->regmap, ADT7470_REG_PWM_MIN(attr->index),
918 mutex_unlock(&data->lock);
920 return err < 0 ? err : count;
923 static ssize_t pwm_tmax_show(struct device *dev,
924 struct device_attribute *devattr, char *buf)
926 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
927 struct adt7470_data *data = adt7470_update_device(dev);
930 return PTR_ERR(data);
932 /* the datasheet says that tmax = tmin + 20C */
933 return sprintf(buf, "%d\n", 1000 * (20 + data->pwm_tmin[attr->index]));
936 static ssize_t pwm_tmin_show(struct device *dev,
937 struct device_attribute *devattr, char *buf)
939 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
940 struct adt7470_data *data = adt7470_update_device(dev);
943 return PTR_ERR(data);
945 return sprintf(buf, "%d\n", 1000 * data->pwm_tmin[attr->index]);
948 static ssize_t pwm_tmin_store(struct device *dev,
949 struct device_attribute *devattr,
950 const char *buf, size_t count)
952 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
953 struct adt7470_data *data = dev_get_drvdata(dev);
957 if (kstrtol(buf, 10, &temp))
960 temp = clamp_val(temp, -128000, 127000);
961 temp = DIV_ROUND_CLOSEST(temp, 1000);
963 mutex_lock(&data->lock);
964 data->pwm_tmin[attr->index] = temp;
965 err = regmap_write(data->regmap, ADT7470_REG_PWM_TMIN(attr->index),
967 mutex_unlock(&data->lock);
969 return err < 0 ? err : count;
972 static ssize_t pwm_auto_temp_show(struct device *dev,
973 struct device_attribute *devattr, char *buf)
975 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
976 struct adt7470_data *data = adt7470_update_device(dev);
980 return PTR_ERR(data);
982 ctrl = data->pwm_auto_temp[attr->index];
984 return sprintf(buf, "%d\n", 1 << (ctrl - 1));
986 return sprintf(buf, "%d\n", ADT7470_PWM_ALL_TEMPS);
989 static int cvt_auto_temp(int input)
991 if (input == ADT7470_PWM_ALL_TEMPS)
993 if (input < 1 || !is_power_of_2(input))
995 return ilog2(input) + 1;
998 static ssize_t pwm_auto_temp_store(struct device *dev,
999 struct device_attribute *devattr,
1000 const char *buf, size_t count)
1002 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
1003 struct adt7470_data *data = dev_get_drvdata(dev);
1004 int pwm_auto_reg = ADT7470_REG_PWM_AUTO_TEMP(attr->index);
1005 unsigned int mask, val;
1009 if (kstrtol(buf, 10, &temp))
1012 temp = cvt_auto_temp(temp);
1016 mutex_lock(&data->lock);
1017 data->pwm_automatic[attr->index] = temp;
1019 if (!(attr->index % 2)) {
1021 val = (temp << 4) & 0xF0;
1027 err = regmap_update_bits(data->regmap, pwm_auto_reg, mask, val);
1028 mutex_unlock(&data->lock);
1030 return err < 0 ? err : count;
1033 static DEVICE_ATTR_RW(alarm_mask);
1034 static DEVICE_ATTR_RW(num_temp_sensors);
1035 static DEVICE_ATTR_RW(auto_update_interval);
1037 static SENSOR_DEVICE_ATTR_RW(force_pwm_max, force_pwm_max, 0);
1039 static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point1_pwm, pwm_min, 0);
1040 static SENSOR_DEVICE_ATTR_RW(pwm2_auto_point1_pwm, pwm_min, 1);
1041 static SENSOR_DEVICE_ATTR_RW(pwm3_auto_point1_pwm, pwm_min, 2);
1042 static SENSOR_DEVICE_ATTR_RW(pwm4_auto_point1_pwm, pwm_min, 3);
1044 static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point2_pwm, pwm_max, 0);
1045 static SENSOR_DEVICE_ATTR_RW(pwm2_auto_point2_pwm, pwm_max, 1);
1046 static SENSOR_DEVICE_ATTR_RW(pwm3_auto_point2_pwm, pwm_max, 2);
1047 static SENSOR_DEVICE_ATTR_RW(pwm4_auto_point2_pwm, pwm_max, 3);
1049 static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point1_temp, pwm_tmin, 0);
1050 static SENSOR_DEVICE_ATTR_RW(pwm2_auto_point1_temp, pwm_tmin, 1);
1051 static SENSOR_DEVICE_ATTR_RW(pwm3_auto_point1_temp, pwm_tmin, 2);
1052 static SENSOR_DEVICE_ATTR_RW(pwm4_auto_point1_temp, pwm_tmin, 3);
1054 static SENSOR_DEVICE_ATTR_RO(pwm1_auto_point2_temp, pwm_tmax, 0);
1055 static SENSOR_DEVICE_ATTR_RO(pwm2_auto_point2_temp, pwm_tmax, 1);
1056 static SENSOR_DEVICE_ATTR_RO(pwm3_auto_point2_temp, pwm_tmax, 2);
1057 static SENSOR_DEVICE_ATTR_RO(pwm4_auto_point2_temp, pwm_tmax, 3);
1059 static SENSOR_DEVICE_ATTR_RW(pwm1_auto_channels_temp, pwm_auto_temp, 0);
1060 static SENSOR_DEVICE_ATTR_RW(pwm2_auto_channels_temp, pwm_auto_temp, 1);
1061 static SENSOR_DEVICE_ATTR_RW(pwm3_auto_channels_temp, pwm_auto_temp, 2);
1062 static SENSOR_DEVICE_ATTR_RW(pwm4_auto_channels_temp, pwm_auto_temp, 3);
1064 static struct attribute *adt7470_attrs[] = {
1065 &dev_attr_alarm_mask.attr,
1066 &dev_attr_num_temp_sensors.attr,
1067 &dev_attr_auto_update_interval.attr,
1068 &sensor_dev_attr_force_pwm_max.dev_attr.attr,
1069 &sensor_dev_attr_pwm1_auto_point1_pwm.dev_attr.attr,
1070 &sensor_dev_attr_pwm2_auto_point1_pwm.dev_attr.attr,
1071 &sensor_dev_attr_pwm3_auto_point1_pwm.dev_attr.attr,
1072 &sensor_dev_attr_pwm4_auto_point1_pwm.dev_attr.attr,
1073 &sensor_dev_attr_pwm1_auto_point2_pwm.dev_attr.attr,
1074 &sensor_dev_attr_pwm2_auto_point2_pwm.dev_attr.attr,
1075 &sensor_dev_attr_pwm3_auto_point2_pwm.dev_attr.attr,
1076 &sensor_dev_attr_pwm4_auto_point2_pwm.dev_attr.attr,
1077 &sensor_dev_attr_pwm1_auto_point1_temp.dev_attr.attr,
1078 &sensor_dev_attr_pwm2_auto_point1_temp.dev_attr.attr,
1079 &sensor_dev_attr_pwm3_auto_point1_temp.dev_attr.attr,
1080 &sensor_dev_attr_pwm4_auto_point1_temp.dev_attr.attr,
1081 &sensor_dev_attr_pwm1_auto_point2_temp.dev_attr.attr,
1082 &sensor_dev_attr_pwm2_auto_point2_temp.dev_attr.attr,
1083 &sensor_dev_attr_pwm3_auto_point2_temp.dev_attr.attr,
1084 &sensor_dev_attr_pwm4_auto_point2_temp.dev_attr.attr,
1085 &sensor_dev_attr_pwm1_auto_channels_temp.dev_attr.attr,
1086 &sensor_dev_attr_pwm2_auto_channels_temp.dev_attr.attr,
1087 &sensor_dev_attr_pwm3_auto_channels_temp.dev_attr.attr,
1088 &sensor_dev_attr_pwm4_auto_channels_temp.dev_attr.attr,
1092 ATTRIBUTE_GROUPS(adt7470);
1094 static int adt7470_read(struct device *dev, enum hwmon_sensor_types type, u32 attr,
1095 int channel, long *val)
1099 return adt7470_temp_read(dev, attr, channel, val);
1101 return adt7470_fan_read(dev, attr, channel, val);
1103 return adt7470_pwm_read(dev, attr, channel, val);
1109 static int adt7470_write(struct device *dev, enum hwmon_sensor_types type, u32 attr,
1110 int channel, long val)
1114 return adt7470_temp_write(dev, attr, channel, val);
1116 return adt7470_fan_write(dev, attr, channel, val);
1118 return adt7470_pwm_write(dev, attr, channel, val);
1124 static umode_t adt7470_is_visible(const void *_data, enum hwmon_sensor_types type,
1125 u32 attr, int channel)
1133 case hwmon_temp_alarm:
1136 case hwmon_temp_min:
1137 case hwmon_temp_max:
1146 case hwmon_fan_input:
1147 case hwmon_fan_alarm:
1160 case hwmon_pwm_input:
1161 case hwmon_pwm_enable:
1164 case hwmon_pwm_freq:
1181 static const struct hwmon_ops adt7470_hwmon_ops = {
1182 .is_visible = adt7470_is_visible,
1183 .read = adt7470_read,
1184 .write = adt7470_write,
1187 static const struct hwmon_channel_info *adt7470_info[] = {
1188 HWMON_CHANNEL_INFO(temp,
1189 HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX | HWMON_T_ALARM,
1190 HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX | HWMON_T_ALARM,
1191 HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX | HWMON_T_ALARM,
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_CHANNEL_INFO(fan,
1200 HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX | HWMON_F_DIV | HWMON_F_ALARM,
1201 HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX | HWMON_F_DIV | HWMON_F_ALARM,
1202 HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX | HWMON_F_DIV | HWMON_F_ALARM,
1203 HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX | HWMON_F_DIV | HWMON_F_ALARM),
1204 HWMON_CHANNEL_INFO(pwm,
1205 HWMON_PWM_INPUT | HWMON_PWM_ENABLE | HWMON_PWM_FREQ,
1206 HWMON_PWM_INPUT | HWMON_PWM_ENABLE,
1207 HWMON_PWM_INPUT | HWMON_PWM_ENABLE,
1208 HWMON_PWM_INPUT | HWMON_PWM_ENABLE),
1212 static const struct hwmon_chip_info adt7470_chip_info = {
1213 .ops = &adt7470_hwmon_ops,
1214 .info = adt7470_info,
1217 /* Return 0 if detection is successful, -ENODEV otherwise */
1218 static int adt7470_detect(struct i2c_client *client,
1219 struct i2c_board_info *info)
1221 struct i2c_adapter *adapter = client->adapter;
1222 int vendor, device, revision;
1224 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
1227 vendor = i2c_smbus_read_byte_data(client, ADT7470_REG_VENDOR);
1228 if (vendor != ADT7470_VENDOR)
1231 device = i2c_smbus_read_byte_data(client, ADT7470_REG_DEVICE);
1232 if (device != ADT7470_DEVICE)
1235 revision = i2c_smbus_read_byte_data(client, ADT7470_REG_REVISION);
1236 if (revision != ADT7470_REVISION)
1239 strscpy(info->type, "adt7470", I2C_NAME_SIZE);
1244 static const struct regmap_config adt7470_regmap_config = {
1247 .use_single_read = true,
1248 .use_single_write = true,
1251 static int adt7470_probe(struct i2c_client *client)
1253 struct device *dev = &client->dev;
1254 struct adt7470_data *data;
1255 struct device *hwmon_dev;
1258 data = devm_kzalloc(dev, sizeof(struct adt7470_data), GFP_KERNEL);
1262 data->num_temp_sensors = -1;
1263 data->auto_update_interval = AUTO_UPDATE_INTERVAL;
1264 data->regmap = devm_regmap_init_i2c(client, &adt7470_regmap_config);
1265 if (IS_ERR(data->regmap))
1266 return PTR_ERR(data->regmap);
1268 i2c_set_clientdata(client, data);
1269 mutex_init(&data->lock);
1271 dev_info(&client->dev, "%s chip found\n", client->name);
1273 /* Initialize the ADT7470 chip */
1274 err = regmap_update_bits(data->regmap, ADT7470_REG_CFG,
1275 ADT7470_STRT_MASK | ADT7470_TEST_MASK,
1276 ADT7470_STRT_MASK | ADT7470_TEST_MASK);
1280 /* Register sysfs hooks */
1281 hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, data,
1285 if (IS_ERR(hwmon_dev))
1286 return PTR_ERR(hwmon_dev);
1288 data->auto_update = kthread_run(adt7470_update_thread, client, "%s",
1289 dev_name(hwmon_dev));
1290 if (IS_ERR(data->auto_update))
1291 return PTR_ERR(data->auto_update);
1296 static int adt7470_remove(struct i2c_client *client)
1298 struct adt7470_data *data = i2c_get_clientdata(client);
1300 kthread_stop(data->auto_update);
1304 static const struct i2c_device_id adt7470_id[] = {
1308 MODULE_DEVICE_TABLE(i2c, adt7470_id);
1310 static struct i2c_driver adt7470_driver = {
1311 .class = I2C_CLASS_HWMON,
1315 .probe_new = adt7470_probe,
1316 .remove = adt7470_remove,
1317 .id_table = adt7470_id,
1318 .detect = adt7470_detect,
1319 .address_list = normal_i2c,
1322 module_i2c_driver(adt7470_driver);
1324 MODULE_AUTHOR("Darrick J. Wong <darrick.wong@oracle.com>");
1325 MODULE_DESCRIPTION("ADT7470 driver");
1326 MODULE_LICENSE("GPL");