pwm->pwm = chip->base + i;
pwm->hwpwm = i;
pwm->polarity = polarity;
+ mutex_init(&pwm->lock);
radix_tree_insert(&pwm_tree, pwm->pwm, pwm);
}
unsigned int i;
int ret = 0;
+ pwmchip_sysfs_unexport_children(chip);
+
mutex_lock(&pwm_lock);
for (i = 0; i < chip->npwm; i++) {
if (!pwm->chip->ops->set_polarity)
return -ENOSYS;
- if (pwm_is_enabled(pwm))
- return -EBUSY;
+ mutex_lock(&pwm->lock);
+
+ if (pwm_is_enabled(pwm)) {
+ err = -EBUSY;
+ goto unlock;
+ }
err = pwm->chip->ops->set_polarity(pwm->chip, pwm, polarity);
if (err)
- return err;
+ goto unlock;
pwm->polarity = polarity;
- return 0;
+unlock:
+ mutex_unlock(&pwm->lock);
+ return err;
}
EXPORT_SYMBOL_GPL(pwm_set_polarity);
*/
int pwm_enable(struct pwm_device *pwm)
{
- if (pwm && !test_and_set_bit(PWMF_ENABLED, &pwm->flags))
- return pwm->chip->ops->enable(pwm->chip, pwm);
+ int err = 0;
+
+ if (!pwm)
+ return -EINVAL;
- return pwm ? 0 : -EINVAL;
+ mutex_lock(&pwm->lock);
+
+ if (!test_and_set_bit(PWMF_ENABLED, &pwm->flags)) {
+ err = pwm->chip->ops->enable(pwm->chip, pwm);
+ if (err)
+ clear_bit(PWMF_ENABLED, &pwm->flags);
+ }
+
+ mutex_unlock(&pwm->lock);
+
+ return err;
}
EXPORT_SYMBOL_GPL(pwm_enable);
}
}
- if (!chosen)
+ if (!chosen) {
+ pwm = ERR_PTR(-ENODEV);
goto out;
+ }
chip = pwmchip_find_by_name(chosen->provider);
if (!chip)
*/
bool pwm_can_sleep(struct pwm_device *pwm)
{
- return pwm->chip->can_sleep;
+ return true;
}
EXPORT_SYMBOL_GPL(pwm_can_sleep);