Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 148a5dd5 authored by Frans Klaver's avatar Frans Klaver Committed by Darren Hart
Browse files

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: default avatarFrans Klaver <fransklaver@gmail.com>
Signed-off-by: default avatarDarren Hart <dvhart@linux.intel.com>
parent a5de681c

drivers/platform/x86/eeepc-laptop.c

+13 −3
Original line number Diff line number Diff line
@@ -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);

}