1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * amc6821.c - Part of lm_sensors, Linux kernel modules for hardware
5 * Copyright (C) 2009 T. Mertelj <tomaz.mertelj@guest.arnes.si>
8 * Copyright (C) 2007 Hans J. Koch <hjk@hansjkoch.de>
10 * Conversion to regmap and with_info API:
11 * Copyright (C) 2024 Guenter Roeck <linux@roeck-us.net>
14 #include <linux/bitfield.h>
15 #include <linux/bitops.h>
16 #include <linux/bits.h>
17 #include <linux/err.h>
18 #include <linux/hwmon.h>
19 #include <linux/hwmon-sysfs.h>
20 #include <linux/i2c.h>
21 #include <linux/init.h>
22 #include <linux/minmax.h>
23 #include <linux/module.h>
24 #include <linux/mutex.h>
25 #include <linux/regmap.h>
26 #include <linux/slab.h>
32 static const unsigned short normal_i2c[] = {0x18, 0x19, 0x1a, 0x2c, 0x2d, 0x2e,
33 0x4c, 0x4d, 0x4e, I2C_CLIENT_END};
39 static int pwminv; /*Inverted PWM output. */
40 module_param(pwminv, int, 0444);
42 static int init = 1; /*Power-on initialization.*/
43 module_param(init, int, 0444);
45 #define AMC6821_REG_DEV_ID 0x3D
46 #define AMC6821_REG_COMP_ID 0x3E
47 #define AMC6821_REG_CONF1 0x00
48 #define AMC6821_REG_CONF2 0x01
49 #define AMC6821_REG_CONF3 0x3F
50 #define AMC6821_REG_CONF4 0x04
51 #define AMC6821_REG_STAT1 0x02
52 #define AMC6821_REG_STAT2 0x03
53 #define AMC6821_REG_TEMP_LO 0x06
54 #define AMC6821_REG_TDATA_LOW 0x08
55 #define AMC6821_REG_TDATA_HI 0x09
56 #define AMC6821_REG_LTEMP_HI 0x0A
57 #define AMC6821_REG_RTEMP_HI 0x0B
58 #define AMC6821_REG_LTEMP_LIMIT_MIN 0x15
59 #define AMC6821_REG_LTEMP_LIMIT_MAX 0x14
60 #define AMC6821_REG_RTEMP_LIMIT_MIN 0x19
61 #define AMC6821_REG_RTEMP_LIMIT_MAX 0x18
62 #define AMC6821_REG_LTEMP_CRIT 0x1B
63 #define AMC6821_REG_RTEMP_CRIT 0x1D
64 #define AMC6821_REG_PSV_TEMP 0x1C
65 #define AMC6821_REG_DCY 0x22
66 #define AMC6821_REG_LTEMP_FAN_CTRL 0x24
67 #define AMC6821_REG_RTEMP_FAN_CTRL 0x25
68 #define AMC6821_REG_DCY_LOW_TEMP 0x21
70 #define AMC6821_REG_TACH_LLIMITL 0x10
71 #define AMC6821_REG_TACH_HLIMITL 0x12
72 #define AMC6821_REG_TACH_SETTINGL 0x1e
74 #define AMC6821_CONF1_START BIT(0)
75 #define AMC6821_CONF1_FAN_INT_EN BIT(1)
76 #define AMC6821_CONF1_FANIE BIT(2)
77 #define AMC6821_CONF1_PWMINV BIT(3)
78 #define AMC6821_CONF1_FAN_FAULT_EN BIT(4)
79 #define AMC6821_CONF1_FDRC0 BIT(5)
80 #define AMC6821_CONF1_FDRC1 BIT(6)
81 #define AMC6821_CONF1_THERMOVIE BIT(7)
83 #define AMC6821_CONF2_PWM_EN BIT(0)
84 #define AMC6821_CONF2_TACH_MODE BIT(1)
85 #define AMC6821_CONF2_TACH_EN BIT(2)
86 #define AMC6821_CONF2_RTFIE BIT(3)
87 #define AMC6821_CONF2_LTOIE BIT(4)
88 #define AMC6821_CONF2_RTOIE BIT(5)
89 #define AMC6821_CONF2_PSVIE BIT(6)
90 #define AMC6821_CONF2_RST BIT(7)
92 #define AMC6821_CONF3_THERM_FAN_EN BIT(7)
93 #define AMC6821_CONF3_REV_MASK GENMASK(3, 0)
95 #define AMC6821_CONF4_OVREN BIT(4)
96 #define AMC6821_CONF4_TACH_FAST BIT(5)
97 #define AMC6821_CONF4_PSPR BIT(6)
98 #define AMC6821_CONF4_MODE BIT(7)
100 #define AMC6821_STAT1_RPM_ALARM BIT(0)
101 #define AMC6821_STAT1_FANS BIT(1)
102 #define AMC6821_STAT1_RTH BIT(2)
103 #define AMC6821_STAT1_RTL BIT(3)
104 #define AMC6821_STAT1_R_THERM BIT(4)
105 #define AMC6821_STAT1_RTF BIT(5)
106 #define AMC6821_STAT1_LTH BIT(6)
107 #define AMC6821_STAT1_LTL BIT(7)
109 #define AMC6821_STAT2_RTC BIT(3)
110 #define AMC6821_STAT2_LTC BIT(4)
111 #define AMC6821_STAT2_LPSV BIT(5)
112 #define AMC6821_STAT2_L_THERM BIT(6)
113 #define AMC6821_STAT2_THERM_IN BIT(7)
115 #define AMC6821_TEMP_SLOPE_MASK GENMASK(2, 0)
116 #define AMC6821_TEMP_LIMIT_MASK GENMASK(7, 3)
119 * Client data (each client gets its own)
122 struct amc6821_data {
123 struct regmap *regmap;
124 struct mutex update_lock;
128 * Return 0 on success or negative error code.
130 * temps returns set of three temperatures, in °C:
131 * temps[0]: Passive cooling temperature, applies to both channels
132 * temps[1]: Low temperature, start slope calculations
133 * temps[2]: High temperature
135 * Channel 0: local, channel 1: remote.
137 static int amc6821_get_auto_point_temps(struct regmap *regmap, int channel, u8 *temps)
140 AMC6821_REG_DCY_LOW_TEMP,
141 AMC6821_REG_PSV_TEMP,
142 channel ? AMC6821_REG_RTEMP_FAN_CTRL : AMC6821_REG_LTEMP_FAN_CTRL
148 err = regmap_multi_reg_read(regmap, regs, regvals, 3);
151 temps[0] = regvals[1];
152 temps[1] = FIELD_GET(AMC6821_TEMP_LIMIT_MASK, regvals[2]) * 4;
154 /* slope is 32 >> <slope bits> in °C */
155 slope = 32 >> FIELD_GET(AMC6821_TEMP_SLOPE_MASK, regvals[2]);
157 temps[2] = temps[1] + DIV_ROUND_CLOSEST(255 - regvals[0], slope);
164 static int amc6821_temp_read_values(struct regmap *regmap, u32 attr, int channel, long *val)
170 case hwmon_temp_input:
171 reg = channel ? AMC6821_REG_RTEMP_HI : AMC6821_REG_LTEMP_HI;
174 reg = channel ? AMC6821_REG_RTEMP_LIMIT_MIN : AMC6821_REG_LTEMP_LIMIT_MIN;
177 reg = channel ? AMC6821_REG_RTEMP_LIMIT_MAX : AMC6821_REG_LTEMP_LIMIT_MAX;
179 case hwmon_temp_crit:
180 reg = channel ? AMC6821_REG_RTEMP_CRIT : AMC6821_REG_LTEMP_CRIT;
185 err = regmap_read(regmap, reg, ®val);
188 *val = sign_extend32(regval, 7) * 1000;
192 static int amc6821_read_alarms(struct regmap *regmap, enum hwmon_sensor_types type,
193 u32 attr, int channel, long *val)
201 case hwmon_temp_min_alarm:
202 reg = AMC6821_REG_STAT1;
203 mask = channel ? AMC6821_STAT1_RTL : AMC6821_STAT1_LTL;
205 case hwmon_temp_max_alarm:
206 reg = AMC6821_REG_STAT1;
207 mask = channel ? AMC6821_STAT1_RTH : AMC6821_STAT1_LTH;
209 case hwmon_temp_crit_alarm:
210 reg = AMC6821_REG_STAT2;
211 mask = channel ? AMC6821_STAT2_RTC : AMC6821_STAT2_LTC;
213 case hwmon_temp_fault:
214 reg = AMC6821_REG_STAT1;
215 mask = AMC6821_STAT1_RTF;
223 case hwmon_fan_fault:
224 reg = AMC6821_REG_STAT1;
225 mask = AMC6821_STAT1_FANS;
234 err = regmap_read(regmap, reg, ®val);
237 *val = !!(regval & mask);
241 static int amc6821_temp_read(struct device *dev, u32 attr, int channel, long *val)
243 struct amc6821_data *data = dev_get_drvdata(dev);
246 case hwmon_temp_input:
249 case hwmon_temp_crit:
250 return amc6821_temp_read_values(data->regmap, attr, channel, val);
251 case hwmon_temp_min_alarm:
252 case hwmon_temp_max_alarm:
253 case hwmon_temp_crit_alarm:
254 case hwmon_temp_fault:
255 return amc6821_read_alarms(data->regmap, hwmon_temp, attr, channel, val);
261 static int amc6821_temp_write(struct device *dev, u32 attr, int channel, long val)
263 struct amc6821_data *data = dev_get_drvdata(dev);
266 val = DIV_ROUND_CLOSEST(clamp_val(val, -128000, 127000), 1000);
270 reg = channel ? AMC6821_REG_RTEMP_LIMIT_MIN : AMC6821_REG_LTEMP_LIMIT_MIN;
273 reg = channel ? AMC6821_REG_RTEMP_LIMIT_MAX : AMC6821_REG_LTEMP_LIMIT_MAX;
275 case hwmon_temp_crit:
276 reg = channel ? AMC6821_REG_RTEMP_CRIT : AMC6821_REG_LTEMP_CRIT;
281 return regmap_write(data->regmap, reg, val);
284 static int amc6821_pwm_read(struct device *dev, u32 attr, long *val)
286 struct amc6821_data *data = dev_get_drvdata(dev);
287 struct regmap *regmap = data->regmap;
292 case hwmon_pwm_enable:
293 err = regmap_read(regmap, AMC6821_REG_CONF1, ®val);
296 switch (regval & (AMC6821_CONF1_FDRC0 | AMC6821_CONF1_FDRC1)) {
298 *val = 1; /* manual */
300 case AMC6821_CONF1_FDRC0:
301 *val = 4; /* target rpm (fan1_target) controlled */
303 case AMC6821_CONF1_FDRC1:
304 *val = 2; /* remote temp controlled */
307 *val = 3; /* max(local, remote) temp controlled */
312 err = regmap_read(regmap, AMC6821_REG_CONF2, ®val);
315 *val = !!(regval & AMC6821_CONF2_TACH_MODE);
317 case hwmon_pwm_auto_channels_temp:
318 err = regmap_read(regmap, AMC6821_REG_CONF1, ®val);
321 switch (regval & (AMC6821_CONF1_FDRC0 | AMC6821_CONF1_FDRC1)) {
323 case AMC6821_CONF1_FDRC0:
324 *val = 0; /* manual or target rpm controlled */
326 case AMC6821_CONF1_FDRC1:
327 *val = 2; /* remote temp controlled */
330 *val = 3; /* max(local, remote) temp controlled */
334 case hwmon_pwm_input:
335 err = regmap_read(regmap, AMC6821_REG_DCY, ®val);
345 static int amc6821_pwm_write(struct device *dev, u32 attr, long val)
347 struct amc6821_data *data = dev_get_drvdata(dev);
348 struct regmap *regmap = data->regmap;
352 case hwmon_pwm_enable:
358 mode = AMC6821_CONF1_FDRC1;
361 mode = AMC6821_CONF1_FDRC0 | AMC6821_CONF1_FDRC1;
364 mode = AMC6821_CONF1_FDRC0;
369 return regmap_update_bits(regmap, AMC6821_REG_CONF1,
370 AMC6821_CONF1_FDRC0 | AMC6821_CONF1_FDRC1,
373 if (val < 0 || val > 1)
375 return regmap_update_bits(regmap, AMC6821_REG_CONF2,
376 AMC6821_CONF2_TACH_MODE,
377 val ? AMC6821_CONF2_TACH_MODE : 0);
379 case hwmon_pwm_input:
380 if (val < 0 || val > 255)
382 return regmap_write(regmap, AMC6821_REG_DCY, val);
388 static int amc6821_fan_read_rpm(struct regmap *regmap, u32 attr, long *val)
395 case hwmon_fan_input:
396 reg = AMC6821_REG_TDATA_LOW;
399 reg = AMC6821_REG_TACH_LLIMITL;
402 reg = AMC6821_REG_TACH_HLIMITL;
404 case hwmon_fan_target:
405 reg = AMC6821_REG_TACH_SETTINGL;
411 err = regmap_bulk_read(regmap, reg, regs, 2);
415 regval = (regs[1] << 8) | regs[0];
416 *val = regval ? 6000000 / regval : 0;
421 static int amc6821_fan_read(struct device *dev, u32 attr, long *val)
423 struct amc6821_data *data = dev_get_drvdata(dev);
424 struct regmap *regmap = data->regmap;
429 case hwmon_fan_input:
432 case hwmon_fan_target:
433 return amc6821_fan_read_rpm(regmap, attr, val);
434 case hwmon_fan_fault:
435 return amc6821_read_alarms(regmap, hwmon_fan, attr, 0, val);
436 case hwmon_fan_pulses:
437 err = regmap_read(regmap, AMC6821_REG_CONF4, ®val);
440 *val = (regval & AMC6821_CONF4_PSPR) ? 4 : 2;
447 static int amc6821_fan_write(struct device *dev, u32 attr, long val)
449 struct amc6821_data *data = dev_get_drvdata(dev);
450 struct regmap *regmap = data->regmap;
454 if (attr == hwmon_fan_pulses) {
455 if (val != 2 && val != 4)
457 return regmap_update_bits(regmap, AMC6821_REG_CONF4,
459 val == 4 ? AMC6821_CONF4_PSPR : 0);
467 if (!val) /* no unlimited minimum speed */
469 reg = AMC6821_REG_TACH_LLIMITL;
472 reg = AMC6821_REG_TACH_HLIMITL;
474 case hwmon_fan_target:
475 if (!val) /* no unlimited target speed */
477 reg = AMC6821_REG_TACH_SETTINGL;
483 val = val ? 6000000 / clamp_val(val, 1, 6000000) : 0;
484 val = clamp_val(val, 0, 0xffff);
486 regs[0] = val & 0xff;
489 return regmap_bulk_write(data->regmap, reg, regs, 2);
492 static ssize_t temp_auto_point_temp_show(struct device *dev,
493 struct device_attribute *devattr,
496 struct amc6821_data *data = dev_get_drvdata(dev);
497 int ix = to_sensor_dev_attr_2(devattr)->index;
498 int nr = to_sensor_dev_attr_2(devattr)->nr;
502 mutex_lock(&data->update_lock);
503 err = amc6821_get_auto_point_temps(data->regmap, nr, temps);
504 mutex_unlock(&data->update_lock);
508 return sysfs_emit(buf, "%d\n", temps[ix] * 1000);
511 static ssize_t pwm1_auto_point_pwm_show(struct device *dev,
512 struct device_attribute *devattr,
515 struct amc6821_data *data = dev_get_drvdata(dev);
516 int ix = to_sensor_dev_attr(devattr)->index;
525 err = regmap_read(data->regmap, AMC6821_REG_DCY_LOW_TEMP, &val);
533 return sysfs_emit(buf, "%d\n", val);
537 * Set TEMP[0-4] (low temperature) and SLP[0-2] (slope) of local or remote
538 * TEMP-FAN control register.
540 * Return 0 on success or negative error code.
542 * Channel 0: local, channel 1: remote
544 static inline int set_slope_register(struct regmap *regmap, int channel, u8 *temps)
546 u8 regval = FIELD_PREP(AMC6821_TEMP_LIMIT_MASK, temps[1] / 4);
551 err = regmap_read(regmap, AMC6821_REG_DCY_LOW_TEMP, &pwm);
557 dt = temps[2] - temps[1];
558 for (tmp = 4; tmp > 0; tmp--) {
559 if (dt * (32 >> tmp) >= dpwm)
562 regval |= FIELD_PREP(AMC6821_TEMP_SLOPE_MASK, tmp);
564 return regmap_write(regmap,
565 channel ? AMC6821_REG_RTEMP_FAN_CTRL : AMC6821_REG_LTEMP_FAN_CTRL,
569 static ssize_t temp_auto_point_temp_store(struct device *dev,
570 struct device_attribute *attr,
571 const char *buf, size_t count)
573 struct amc6821_data *data = dev_get_drvdata(dev);
574 int ix = to_sensor_dev_attr_2(attr)->index;
575 int nr = to_sensor_dev_attr_2(attr)->nr;
576 struct regmap *regmap = data->regmap;
577 u8 temps[3], otemps[3];
581 ret = kstrtol(buf, 10, &val);
585 mutex_lock(&data->update_lock);
587 ret = amc6821_get_auto_point_temps(data->regmap, nr, temps);
594 * Passive cooling temperature. Range limit against low limit
597 ret = amc6821_get_auto_point_temps(data->regmap, 1 - nr, otemps);
600 val = DIV_ROUND_CLOSEST(clamp_val(val, 0, 63000), 1000);
601 val = clamp_val(val, 0, min(temps[1], otemps[1]));
602 ret = regmap_write(regmap, AMC6821_REG_PSV_TEMP, val);
606 * Low limit; must be between passive and high limit,
607 * and not exceed 124. Step size is 4 degrees C.
609 val = clamp_val(val, DIV_ROUND_UP(temps[0], 4) * 4000, 124000);
610 temps[1] = DIV_ROUND_CLOSEST(val, 4000) * 4;
612 /* Auto-adjust high limit if necessary */
613 temps[2] = clamp_val(temps[2], temps[1] + 1, 255);
614 ret = set_slope_register(regmap, nr, temps);
617 /* high limit, must be higher than low limit */
618 val = clamp_val(val, (temps[1] + 1) * 1000, 255000);
619 temps[2] = DIV_ROUND_CLOSEST(val, 1000);
620 ret = set_slope_register(regmap, nr, temps);
627 mutex_unlock(&data->update_lock);
628 return ret ? : count;
631 static ssize_t pwm1_auto_point_pwm_store(struct device *dev,
632 struct device_attribute *attr,
633 const char *buf, size_t count)
635 struct amc6821_data *data = dev_get_drvdata(dev);
636 struct regmap *regmap = data->regmap;
640 ret = kstrtou8(buf, 10, &val);
644 mutex_lock(&data->update_lock);
645 ret = regmap_write(regmap, AMC6821_REG_DCY_LOW_TEMP, val);
649 for (i = 0; i < 2; i++) {
652 ret = amc6821_get_auto_point_temps(regmap, i, temps);
655 ret = set_slope_register(regmap, i, temps);
660 mutex_unlock(&data->update_lock);
661 return ret ? : count;
664 static SENSOR_DEVICE_ATTR_RO(pwm1_auto_point1_pwm, pwm1_auto_point_pwm, 0);
665 static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point2_pwm, pwm1_auto_point_pwm, 1);
666 static SENSOR_DEVICE_ATTR_RO(pwm1_auto_point3_pwm, pwm1_auto_point_pwm, 2);
667 static SENSOR_DEVICE_ATTR_2_RO(temp1_auto_point1_temp, temp_auto_point_temp,
669 static SENSOR_DEVICE_ATTR_2_RW(temp1_auto_point2_temp, temp_auto_point_temp,
671 static SENSOR_DEVICE_ATTR_2_RW(temp1_auto_point3_temp, temp_auto_point_temp,
674 static SENSOR_DEVICE_ATTR_2_RW(temp2_auto_point1_temp, temp_auto_point_temp,
676 static SENSOR_DEVICE_ATTR_2_RW(temp2_auto_point2_temp, temp_auto_point_temp,
678 static SENSOR_DEVICE_ATTR_2_RW(temp2_auto_point3_temp, temp_auto_point_temp,
681 static struct attribute *amc6821_attrs[] = {
682 &sensor_dev_attr_pwm1_auto_point1_pwm.dev_attr.attr,
683 &sensor_dev_attr_pwm1_auto_point2_pwm.dev_attr.attr,
684 &sensor_dev_attr_pwm1_auto_point3_pwm.dev_attr.attr,
685 &sensor_dev_attr_temp1_auto_point1_temp.dev_attr.attr,
686 &sensor_dev_attr_temp1_auto_point2_temp.dev_attr.attr,
687 &sensor_dev_attr_temp1_auto_point3_temp.dev_attr.attr,
688 &sensor_dev_attr_temp2_auto_point1_temp.dev_attr.attr,
689 &sensor_dev_attr_temp2_auto_point2_temp.dev_attr.attr,
690 &sensor_dev_attr_temp2_auto_point3_temp.dev_attr.attr,
693 ATTRIBUTE_GROUPS(amc6821);
695 static int amc6821_read(struct device *dev, enum hwmon_sensor_types type,
696 u32 attr, int channel, long *val)
700 return amc6821_temp_read(dev, attr, channel, val);
702 return amc6821_fan_read(dev, attr, val);
704 return amc6821_pwm_read(dev, attr, val);
710 static int amc6821_write(struct device *dev, enum hwmon_sensor_types type,
711 u32 attr, int channel, long val)
715 return amc6821_temp_write(dev, attr, channel, val);
717 return amc6821_fan_write(dev, attr, val);
719 return amc6821_pwm_write(dev, attr, val);
725 static umode_t amc6821_is_visible(const void *data,
726 enum hwmon_sensor_types type,
727 u32 attr, int channel)
732 case hwmon_temp_input:
733 case hwmon_temp_min_alarm:
734 case hwmon_temp_max_alarm:
735 case hwmon_temp_crit_alarm:
736 case hwmon_temp_fault:
740 case hwmon_temp_crit:
747 case hwmon_fan_input:
748 case hwmon_fan_fault:
750 case hwmon_fan_pulses:
753 case hwmon_fan_target:
761 case hwmon_pwm_enable:
762 case hwmon_pwm_input:
764 case hwmon_pwm_auto_channels_temp:
774 static const struct hwmon_channel_info * const amc6821_info[] = {
775 HWMON_CHANNEL_INFO(temp,
776 HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX |
777 HWMON_T_CRIT | HWMON_T_MIN_ALARM |
778 HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM,
779 HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX |
780 HWMON_T_CRIT | HWMON_T_MIN_ALARM |
781 HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM |
783 HWMON_CHANNEL_INFO(fan,
784 HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX |
785 HWMON_F_TARGET | HWMON_F_PULSES | HWMON_F_FAULT),
786 HWMON_CHANNEL_INFO(pwm,
787 HWMON_PWM_INPUT | HWMON_PWM_ENABLE | HWMON_PWM_MODE |
788 HWMON_PWM_AUTO_CHANNELS_TEMP),
792 static const struct hwmon_ops amc6821_hwmon_ops = {
793 .is_visible = amc6821_is_visible,
794 .read = amc6821_read,
795 .write = amc6821_write,
798 static const struct hwmon_chip_info amc6821_chip_info = {
799 .ops = &amc6821_hwmon_ops,
800 .info = amc6821_info,
803 /* Return 0 if detection is successful, -ENODEV otherwise */
804 static int amc6821_detect(struct i2c_client *client, 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 strscpy(info->type, "amc6821", I2C_NAME_SIZE);
847 static int amc6821_init_client(struct amc6821_data *data)
849 struct regmap *regmap = data->regmap;
853 err = regmap_set_bits(regmap, AMC6821_REG_CONF4, AMC6821_CONF4_MODE);
856 err = regmap_clear_bits(regmap, AMC6821_REG_CONF3, AMC6821_CONF3_THERM_FAN_EN);
859 err = regmap_clear_bits(regmap, AMC6821_REG_CONF2,
860 AMC6821_CONF2_RTFIE |
861 AMC6821_CONF2_LTOIE |
862 AMC6821_CONF2_RTOIE);
866 err = regmap_update_bits(regmap, AMC6821_REG_CONF1,
867 AMC6821_CONF1_THERMOVIE | AMC6821_CONF1_FANIE |
868 AMC6821_CONF1_START | AMC6821_CONF1_PWMINV,
869 AMC6821_CONF1_START |
870 (pwminv ? AMC6821_CONF1_PWMINV : 0));
877 static bool amc6821_volatile_reg(struct device *dev, unsigned int reg)
880 case AMC6821_REG_STAT1:
881 case AMC6821_REG_STAT2:
882 case AMC6821_REG_TEMP_LO:
883 case AMC6821_REG_TDATA_LOW:
884 case AMC6821_REG_LTEMP_HI:
885 case AMC6821_REG_RTEMP_HI:
886 case AMC6821_REG_TDATA_HI:
893 static const struct regmap_config amc6821_regmap_config = {
896 .max_register = AMC6821_REG_CONF3,
897 .volatile_reg = amc6821_volatile_reg,
898 .cache_type = REGCACHE_MAPLE,
901 static int amc6821_probe(struct i2c_client *client)
903 struct device *dev = &client->dev;
904 struct amc6821_data *data;
905 struct device *hwmon_dev;
906 struct regmap *regmap;
909 data = devm_kzalloc(dev, sizeof(struct amc6821_data), GFP_KERNEL);
913 regmap = devm_regmap_init_i2c(client, &amc6821_regmap_config);
915 return dev_err_probe(dev, PTR_ERR(regmap),
916 "Failed to initialize regmap\n");
917 data->regmap = regmap;
919 err = amc6821_init_client(data);
923 hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
924 data, &amc6821_chip_info,
926 return PTR_ERR_OR_ZERO(hwmon_dev);
929 static const struct i2c_device_id amc6821_id[] = {
934 MODULE_DEVICE_TABLE(i2c, amc6821_id);
936 static const struct of_device_id __maybe_unused amc6821_of_match[] = {
938 .compatible = "ti,amc6821",
943 MODULE_DEVICE_TABLE(of, amc6821_of_match);
945 static struct i2c_driver amc6821_driver = {
946 .class = I2C_CLASS_HWMON,
949 .of_match_table = of_match_ptr(amc6821_of_match),
951 .probe = amc6821_probe,
952 .id_table = amc6821_id,
953 .detect = amc6821_detect,
954 .address_list = normal_i2c,
957 module_i2c_driver(amc6821_driver);
959 MODULE_LICENSE("GPL");
960 MODULE_AUTHOR("T. Mertelj <tomaz.mertelj@guest.arnes.si>");
961 MODULE_DESCRIPTION("Texas Instruments amc6821 hwmon driver");