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author | Frans Klaver <fransklaver@gmail.com> | 2014-10-22 21:12:42 +0200 |
---|---|---|
committer | Darren Hart <dvhart@linux.intel.com> | 2014-11-19 09:07:08 -0800 |
commit | 148a5dd5ccc25581b44a38079128f49e47353713 (patch) | |
tree | 7ec112b7ade095e09a0eb402c58be91f0d72a4d4 /drivers/platform/x86 | |
parent | a5de681c0cf7350fa13ccd67f1a118f1651cc2d5 (diff) | |
download | op-kernel-dev-148a5dd5ccc25581b44a38079128f49e47353713.zip op-kernel-dev-148a5dd5ccc25581b44a38079128f49e47353713.tar.gz |
eeepc-laptop: document fan_pwm conversions
eeepc_get_fan_pwm and eeepc_set_fan_pwm convert the PWM value read from
the fan to a range lmsensors understands. Unfortunately this is only
clear if you are familiar with how lmsensors handles duty cycles.
Introduce two conversion functions that document the goal of these
conversions.
Signed-off-by: Frans Klaver <fransklaver@gmail.com>
Signed-off-by: Darren Hart <dvhart@linux.intel.com>
Diffstat (limited to 'drivers/platform/x86')
-rw-r--r-- | drivers/platform/x86/eeepc-laptop.c | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/drivers/platform/x86/eeepc-laptop.c b/drivers/platform/x86/eeepc-laptop.c index c1758ec..e87c134 100644 --- a/drivers/platform/x86/eeepc-laptop.c +++ b/drivers/platform/x86/eeepc-laptop.c @@ -980,18 +980,28 @@ static struct platform_driver platform_driver = { #define EEEPC_EC_SFB0 0xD0 #define EEEPC_EC_FAN_CTRL (EEEPC_EC_SFB0 + 3) /* Byte containing SF25 */ +static inline int eeepc_pwm_to_lmsensors(int value) +{ + return value * 255 / 100; +} + +static inline int eeepc_lmsensors_to_pwm(int value) +{ + value = clamp_val(value, 0, 255); + return value * 100 / 255; +} + static int eeepc_get_fan_pwm(void) { u8 value = 0; ec_read(EEEPC_EC_FAN_PWM, &value); - return value * 255 / 100; + return eeepc_pwm_to_lmsensors(value); } static void eeepc_set_fan_pwm(int value) { - value = clamp_val(value, 0, 255); - value = value * 100 / 255; + value = eeepc_lmsensors_to_pwm(value); ec_write(EEEPC_EC_FAN_PWM, value); } |