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.pack...@alliedtelesis.co.nz>
---
Changes in v3:
- New
Changes in v4:
- Fix pwmfreq_table array indexing
drivers/hwmon/adt7475.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/drivers/hwmon/adt7475.c b/drivers/hwmon/adt7475.c
index 3056076fae27..1baa213a60bd 100644
--- a/drivers/hwmon/adt7475.c
+++ b/drivers/hwmon/adt7475.c
@@ -934,7 +934,7 @@ 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,
@@ -942,9 +942,10 @@ 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,
@@ -965,7 +966,7 @@ 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),
--
2.11.0.24.ge6920cf
