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authorChris Packham <chris.packham@alliedtelesis.co.nz>2017-05-15 13:30:29 +1200
committerGuenter Roeck <linux@roeck-us.net>2017-06-11 17:08:19 -0700
commit3490c92a0963280f7f01ebb23989066a67dfd18d (patch)
tree2164c8303d5aa3ecf107c78b639981abc70667b7 /drivers/hwmon
parent1d58f5efbf2d8599a9062e4c800a072e2f015625 (diff)
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')
-rw-r--r--drivers/hwmon/adt7475.c9
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),