diff options
| author |   Chris Packham <chris.packham@alliedtelesis.co.nz> | 2017-05-15 13:30:29 +1200 |
|---|---|---|
| committer |   Guenter Roeck <linux@roeck-us.net> | 2017-06-11 17:08:19 -0700 |
| commit | 3490c92a0963280f7f01ebb23989066a67dfd18d (patch) | |
| tree | 2164c8303d5aa3ecf107c78b639981abc70667b7 /drivers/hwmon/adt7475.c | |
| parent | hwmon: (adt7475) fan stall prevention (diff) | |
| download | linux-dev-3490c92a0963280f7f01ebb23989066a67dfd18d.tar.xz linux-dev-3490c92a0963280f7f01ebb23989066a67dfd18d.zip | |
hwmon: (adt7475) add high frequency support
Systems using 4-wire fans usually require high frequency (22.5kHz)
output on the pwm. Add 22500 as a valid option in the pwmfreq_table. In
high frequency mode the low-order bit are ignored so they can safely be
set to 0.
Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'drivers/hwmon/adt7475.c')
| -rw-r--r-- | drivers/hwmon/adt7475.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/drivers/hwmon/adt7475.c b/drivers/hwmon/adt7475.c index 3eb8c5c2f8af..3dfb16a95185 100644 --- a/drivers/hwmon/adt7475.c +++ b/drivers/hwmon/adt7475.c @@ -852,7 +852,7 @@ static ssize_t set_pwmctrl(struct device *dev, struct device_attribute *attr, /* List of frequencies for the PWM */ static const int pwmfreq_table[] = { - 11, 14, 22, 29, 35, 44, 58, 88 + 11, 14, 22, 29, 35, 44, 58, 88, 22500 }; static ssize_t show_pwmfreq(struct device *dev, struct device_attribute *attr, @@ -860,9 +860,10 @@ static ssize_t show_pwmfreq(struct device *dev, struct device_attribute *attr, { struct adt7475_data *data = adt7475_update_device(dev); struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr); + int i = clamp_val(data->range[sattr->index] & 0xf, 0, + ARRAY_SIZE(pwmfreq_table) - 1); - return sprintf(buf, "%d\n", - pwmfreq_table[data->range[sattr->index] & 7]); + return sprintf(buf, "%d\n", pwmfreq_table[i]); } static ssize_t set_pwmfreq(struct device *dev, struct device_attribute *attr, @@ -883,7 +884,7 @@ static ssize_t set_pwmfreq(struct device *dev, struct device_attribute *attr, data->range[sattr->index] = adt7475_read(TEMP_TRANGE_REG(sattr->index)); - data->range[sattr->index] &= ~7; + data->range[sattr->index] &= ~0xf; data->range[sattr->index] |= out; i2c_smbus_write_byte_data(client, TEMP_TRANGE_REG(sattr->index), |