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authorFrans Klaver <fransklaver@gmail.com>2014-10-22 21:12:42 +0200
committerDarren Hart <dvhart@linux.intel.com>2014-11-19 09:07:08 -0800
commit148a5dd5ccc25581b44a38079128f49e47353713 (patch)
tree7ec112b7ade095e09a0eb402c58be91f0d72a4d4 /drivers
parenta5de681c0cf7350fa13ccd67f1a118f1651cc2d5 (diff)
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')
-rw-r--r--drivers/platform/x86/eeepc-laptop.c16
1 files changed, 13 insertions, 3 deletions
diff --git a/drivers/platform/x86/eeepc-laptop.c b/drivers/platform/x86/eeepc-laptop.c
index c1758ec3c61b..e87c1346e1d4 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);
}