[PATCH 6/6] hwmon: pwm-fan: Update the duty cycle inorder to control the pwm-fan

From: Anand Moon
Date: Thu Mar 26 2015 - 12:40:54 EST


Below changes depend on following patch.
https://patchwork.kernel.org/patch/5944061/

Update the pwm_config with duty then update the pwm_disable
to poweroff the cpu fan.

Tested on OdroidXU3 board.

Signed-off-by: Anand Moon <linux.amoon@xxxxxxxxx>
---
drivers/hwmon/pwm-fan.c | 10 ++++------
1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/hwmon/pwm-fan.c b/drivers/hwmon/pwm-fan.c
index 7c83dc4..f25c841 100644
--- a/drivers/hwmon/pwm-fan.c
+++ b/drivers/hwmon/pwm-fan.c
@@ -44,26 +44,24 @@ static int __set_pwm(struct pwm_fan_ctx *ctx, unsigned long pwm)
int ret = 0;

mutex_lock(&ctx->lock);
+
if (ctx->pwm_value == pwm)
goto exit_set_pwm_err;

- if (pwm == 0) {
- pwm_disable(ctx->pwm);
- goto exit_set_pwm;
- }
-
duty = DIV_ROUND_UP(pwm * (ctx->pwm->period - 1), MAX_PWM);
ret = pwm_config(ctx->pwm, duty, ctx->pwm->period);
if (ret)
goto exit_set_pwm_err;

+ if (pwm == 0)
+ pwm_disable(ctx->pwm);
+
if (ctx->pwm_value == 0) {
ret = pwm_enable(ctx->pwm);
if (ret)
goto exit_set_pwm_err;
}

-exit_set_pwm:
ctx->pwm_value = pwm;
exit_set_pwm_err:
mutex_unlock(&ctx->lock);
--
1.9.1

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