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| author | Justin Ledford <justinledford@google.com> | 2022-08-29 19:59:30 +0000 |
|---|---|---|
| committer | Guenter Roeck <linux@roeck-us.net> | 2022-09-19 06:17:05 -0700 |
| commit | 5b38279e1a3f10c8046761b9732dccbfed78d614 (patch) | |
| tree | 3587679f263230dad0b6f3a2bd6fd0bceb93add6 /drivers/hwmon/max31790.c | |
| parent | b5ae0ad56455dfb277b165b9270382f0e1c1d943 (diff) | |
| download | linux-5b38279e1a3f10c8046761b9732dccbfed78d614.tar.gz | |
hwmon: (max31790) add fanN_enable
The MAX31790 has a tach input enable bit in each fan's configuration register. This is only enabled by the driver if RPM mode is selected, but the driver doesn't provide a way to independently enable tachometer input regardless of the regulator mode. By adding the fanN_enable sysfs files, we can decouple the tach input from the regulator mode. Also update the documentation. Signed-off-by: Justin Ledford <justinledford@google.com> Link: https://lore.kernel.org/r/20220829195930.2521755-1-justinledford@google.com Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'drivers/hwmon/max31790.c')
| -rw-r--r-- | drivers/hwmon/max31790.c | 38 |
1 files changed, 31 insertions, 7 deletions
diff --git a/drivers/hwmon/max31790.c b/drivers/hwmon/max31790.c index 7e9362f6dc29..20bf5ffadefe 100644 --- a/drivers/hwmon/max31790.c +++ b/drivers/hwmon/max31790.c @@ -202,6 +202,9 @@ static int max31790_read_fan(struct device *dev, u32 attr, int channel, } mutex_unlock(&data->update_lock); return 0; + case hwmon_fan_enable: + *val = !!(data->fan_config[channel] & MAX31790_FAN_CFG_TACH_INPUT_EN); + return 0; default: return -EOPNOTSUPP; } @@ -214,7 +217,7 @@ static int max31790_write_fan(struct device *dev, u32 attr, int channel, struct i2c_client *client = data->client; int target_count; int err = 0; - u8 bits; + u8 bits, fan_config; int sr; mutex_lock(&data->update_lock); @@ -243,6 +246,23 @@ static int max31790_write_fan(struct device *dev, u32 attr, int channel, MAX31790_REG_TARGET_COUNT(channel), data->target_count[channel]); break; + case hwmon_fan_enable: + fan_config = data->fan_config[channel]; + if (val == 0) { + fan_config &= ~MAX31790_FAN_CFG_TACH_INPUT_EN; + } else if (val == 1) { + fan_config |= MAX31790_FAN_CFG_TACH_INPUT_EN; + } else { + err = -EINVAL; + break; + } + if (fan_config != data->fan_config[channel]) { + err = i2c_smbus_write_byte_data(client, MAX31790_REG_FAN_CONFIG(channel), + fan_config); + if (!err) + data->fan_config[channel] = fan_config; + } + break; default: err = -EOPNOTSUPP; break; @@ -270,6 +290,10 @@ static umode_t max31790_fan_is_visible(const void *_data, u32 attr, int channel) !(fan_config & MAX31790_FAN_CFG_TACH_INPUT)) return 0644; return 0; + case hwmon_fan_enable: + if (channel < NR_CHANNEL) + return 0644; + return 0; default: return 0; } @@ -423,12 +447,12 @@ static umode_t max31790_is_visible(const void *data, static const struct hwmon_channel_info *max31790_info[] = { HWMON_CHANNEL_INFO(fan, - HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT, - HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT, - HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT, - HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT, - HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT, - HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT, + HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT | HWMON_F_ENABLE, + HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT | HWMON_F_ENABLE, + HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT | HWMON_F_ENABLE, + HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT | HWMON_F_ENABLE, + HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT | HWMON_F_ENABLE, + HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_FAULT | HWMON_F_ENABLE, HWMON_F_INPUT | HWMON_F_FAULT, HWMON_F_INPUT | HWMON_F_FAULT, HWMON_F_INPUT | HWMON_F_FAULT, |