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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>
This commit is contained in:
Justin Ledford 2022-08-29 19:59:30 +00:00 committed by Guenter Roeck
parent b5ae0ad564
commit 5b38279e1a
2 changed files with 32 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
Documentation/hwmon/max31790.rst
View File

@ -38,6 +38,7 @@ Sysfs entries
fan[1-12]_input RO fan tachometer speed in RPM
fan[1-12]_fault RO fan experienced fault
fan[1-6]_target RW desired fan speed in RPM
fan[1-6]_enable RW enable or disable the tachometer input
pwm[1-6]_enable RW regulator mode, 0=disabled (duty cycle=0%), 1=manual mode, 2=rpm mode
pwm[1-6] RW read: current pwm duty cycle,
write: target pwm duty cycle (0-255)

38
drivers/hwmon/max31790.c
View File

@ -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,