diff options
Diffstat (limited to 'drivers/pwm')
| -rw-r--r-- | drivers/pwm/core.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c index c6e05078d3a..85592e97ef2 100644 --- a/drivers/pwm/core.c +++ b/drivers/pwm/core.c @@ -379,6 +379,28 @@ int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns) EXPORT_SYMBOL_GPL(pwm_config); /** + * pwm_set_polarity() - configure the polarity of a PWM signal + * @pwm: PWM device + * @polarity: new polarity of the PWM signal + * + * Note that the polarity cannot be configured while the PWM device is enabled + */ +int pwm_set_polarity(struct pwm_device *pwm, enum pwm_polarity polarity) +{ + if (!pwm || !pwm->chip->ops) + return -EINVAL; + + if (!pwm->chip->ops->set_polarity) + return -ENOSYS; + + if (test_bit(PWMF_ENABLED, &pwm->flags)) + return -EBUSY; + + return pwm->chip->ops->set_polarity(pwm->chip, pwm, polarity); +} +EXPORT_SYMBOL_GPL(pwm_set_polarity); + +/** * pwm_enable() - start a PWM output toggling * @pwm: PWM device */ |