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hwmon: (amc6821) Add support for pwm1_mode attribute

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AMC6821 supports configuring if a fan is DC or PWM controlled.
Add support for the pwm1_mode attribute to make it runtime configurable.

Reviewed-by: Quentin Schulz <quentin.schulz@cherry.de>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Guenter Roeck 2024-07-01 08:57:58 -07:00
parent e98ab50e1f
commit 4814241a58
2 changed files with 16 additions and 1 deletions
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1
Documentation/hwmon/amc6821.rst
View File

@ -58,6 +58,7 @@ pwm1_enable rw regulator mode, 1=open loop, 2=fan controlled
remote-sensor temperature,
4=fan controlled by target rpm set with
fan1_target attribute.
pwm1_mode rw Fan duty control mode (0=DC, 1=PWM)
pwm1_auto_channels_temp ro 1 if pwm_enable==2, 3 if pwm_enable==3
pwm1_auto_point1_pwm ro Hardwired to 0, shared for both
temperature channels.

16
drivers/hwmon/amc6821.c
View File

@ -312,6 +312,12 @@ static int amc6821_pwm_read(struct device *dev, u32 attr, long *val)
break;
}
return 0;
case hwmon_pwm_mode:
err = regmap_read(regmap, AMC6821_REG_CONF2, &regval);
if (err)
return err;
*val = !!(regval & AMC6821_CONF2_TACH_MODE);
return 0;
case hwmon_pwm_auto_channels_temp:
err = regmap_read(regmap, AMC6821_REG_CONF1, &regval);
if (err)
@ -367,6 +373,13 @@ static int amc6821_pwm_write(struct device *dev, u32 attr, long val)
return regmap_update_bits(regmap, AMC6821_REG_CONF1,
AMC6821_CONF1_FDRC0 | AMC6821_CONF1_FDRC1,
mode);
case hwmon_pwm_mode:
if (val < 0 || val > 1)
return -EINVAL;
return regmap_update_bits(regmap, AMC6821_REG_CONF2,
AMC6821_CONF2_TACH_MODE,
val ? AMC6821_CONF2_TACH_MODE : 0);
break;
case hwmon_pwm_input:
if (val < 0 || val > 255)
return -EINVAL;
@ -748,6 +761,7 @@ static umode_t amc6821_is_visible(const void *data,
}
case hwmon_pwm:
switch (attr) {
case hwmon_pwm_mode:
case hwmon_pwm_enable:
case hwmon_pwm_input:
return 0644;
@ -774,7 +788,7 @@ static const struct hwmon_channel_info * const amc6821_info[] = {
HWMON_F_INPUT | HWMON_F_MIN | HWMON_F_MAX |
HWMON_F_TARGET | HWMON_F_PULSES | HWMON_F_FAULT),
HWMON_CHANNEL_INFO(pwm,
HWMON_PWM_INPUT | HWMON_PWM_ENABLE |
HWMON_PWM_INPUT | HWMON_PWM_ENABLE | HWMON_PWM_MODE |
HWMON_PWM_AUTO_CHANNELS_TEMP),
NULL
};