hwmon: (corsair-cpro) add reading pwm values
This adds the possibility for reading pwm values.
These can not be read if the device is controlled via
fan_target or a fan curve and will return an error in
this case. Since an error is expected, this adds some
rudimentary error handling.
Changes:
- add CTL_GET_FAN_PWM and use it via get_data
- pwm returns -ENODATA if the device returns error 0x12
- fan_target now returns -ENODATA when the driver is
started or a pwm value is set.
- add ccp_get_errno to determine errno from device error.
- get_data now has a parameter to determine whether
to read one or two bytes of data.
- update documentation
- fix missing surname in MAINTAINERS
Signed-off-by: Marius Zachmann <mail@mariuszachmann.de>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
diff --git a/Documentation/hwmon/corsair-cpro.rst b/Documentation/hwmon/corsair-cpro.rst
index 7882015..751f954 100644
--- a/Documentation/hwmon/corsair-cpro.rst
+++ b/Documentation/hwmon/corsair-cpro.rst
@@ -35,8 +35,7 @@
fan[1-6]_label Shows fan type as detected by the device.
fan[1-6]_target Sets fan speed target rpm.
When reading, it reports the last value if it was set by the driver.
- Otherwise returns 0.
-pwm[1-6] Sets the fan speed. Values from 0-255.
- When reading, it reports the last value if it was set by the driver.
- Otherwise returns 0.
+ Otherwise returns an error.
+pwm[1-6] Sets the fan speed. Values from 0-255. Can only be read if pwm
+ was set directly.
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