static int
gpio_pwm_config_nosleep(struct pwm_channel *p,
struct pwm_channel_config *c)
{
struct gpio_pwm *gp = to_gpio_pwm(p);
int ret = 0;
unsigned long flags;
spin_lock_irqsave(&p->lock, flags);
switch (c->config_mask) {
case PWM_CONFIG_DUTY_TICKS:
p->duty_ticks = c->duty_ticks;
break;
case PWM_CONFIG_START:
if (!hrtimer_active(&gp->timer)) {
gpio_pwm_start(p);
}
break;
default:
ret = -EINVAL;
break;
}
spin_unlock_irqrestore(&p->lock, flags);
return ret;
}
static int
gpio_pwm_config(struct pwm_channel *p,
struct pwm_channel_config *c)
{
struct gpio_pwm *gp = to_gpio_pwm(p);
int was_on = 0;
if (p->pwm->config_nosleep) {
if (!p->pwm->config_nosleep(p, c))
return 0;
}
might_sleep();
was_on = gpio_pwm_stop_sync(p);
if (was_on < 0)
return was_on;
if (c->config_mask & PWM_CONFIG_PERIOD_TICKS)
p->period_ticks = c->period_ticks;
if (c->config_mask & PWM_CONFIG_DUTY_TICKS)
p->duty_ticks = c->duty_ticks;
if (c->config_mask & PWM_CONFIG_POLARITY) {
gp->polarity = c->polarity ? 1 : 0;
p->active_high = gp->polarity;
}
if ((c->config_mask & PWM_CONFIG_START)
|| (was_on && !(c->config_mask & PWM_CONFIG_STOP)))
gpio_pwm_start(p);
return 0;
}
