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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>
This commit is contained in:
Frans Klaver 2014-10-22 21:12:42 +02:00 committed by Darren Hart
parent a5de681c0c
commit 148a5dd5cc
1 changed files with 13 additions and 3 deletions
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16
drivers/platform/x86/eeepc-laptop.c
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@ -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);
}