From 4814241a5817ce8140dda8f1375bf76f99e68697 Mon Sep 17 00:00:00 2001 From: Guenter Roeck Date: Mon, 1 Jul 2024 08:57:58 -0700 Subject: [PATCH] hwmon: (amc6821) Add support for pwm1_mode attribute 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 Signed-off-by: Guenter Roeck --- Documentation/hwmon/amc6821.rst | 1 + drivers/hwmon/amc6821.c | 16 +++++++++++++++- 2 files changed, 16 insertions(+), 1 deletion(-) diff --git a/Documentation/hwmon/amc6821.rst b/Documentation/hwmon/amc6821.rst index 96e604c5ea8e..dbd544cd1160 100644 --- a/Documentation/hwmon/amc6821.rst +++ b/Documentation/hwmon/amc6821.rst @@ -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. diff --git a/drivers/hwmon/amc6821.c b/drivers/hwmon/amc6821.c index 8beaea9ecbab..ec94392fcb65 100644 --- a/drivers/hwmon/amc6821.c +++ b/drivers/hwmon/amc6821.c @@ -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, ®val); + 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, ®val); 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 };