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hwmon: (pwm-fan) Refactor fan power on/off

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In preparation for dynamically switching regulator, split the power on
and power off sequence into separate functions.

Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20220914153137.613982-2-alexander.stein@ew.tq-group.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Alexander Stein 2022-09-14 17:31:33 +02:00 committed by Guenter Roeck
parent cc842bd57e
commit bf10ccad06
1 changed files with 30 additions and 6 deletions
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36
drivers/hwmon/pwm-fan.c
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@ -82,23 +82,47 @@ static void sample_timer(struct timer_list *t)
mod_timer(&ctx->rpm_timer, jiffies + HZ);
}
static int pwm_fan_power_on(struct pwm_fan_ctx *ctx)
{
struct pwm_state *state = &ctx->pwm_state;
unsigned long period;
int ret;
period = state->period;
state->duty_cycle = DIV_ROUND_UP(ctx->pwm_value * (period - 1), MAX_PWM);
state->enabled = true;
ret = pwm_apply_state(ctx->pwm, state);
return ret;
}
static int pwm_fan_power_off(struct pwm_fan_ctx *ctx)
{
struct pwm_state *state = &ctx->pwm_state;
state->enabled = false;
state->duty_cycle = 0;
pwm_apply_state(ctx->pwm, state);
return 0;
}
static int __set_pwm(struct pwm_fan_ctx *ctx, unsigned long pwm)
{
unsigned long period;
int ret = 0;
struct pwm_state *state = &ctx->pwm_state;
mutex_lock(&ctx->lock);
if (ctx->pwm_value == pwm)
goto exit_set_pwm_err;
period = state->period;
state->duty_cycle = DIV_ROUND_UP(pwm * (period - 1), MAX_PWM);
state->enabled = pwm ? true : false;
if (pwm > 0)
ret = pwm_fan_power_on(ctx);
else
ret = pwm_fan_power_off(ctx);
ret = pwm_apply_state(ctx->pwm, state);
if (!ret)
ctx->pwm_value = pwm;
exit_set_pwm_err:
mutex_unlock(&ctx->lock);
return ret;