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pwm: Add support for configuring the PWM polarity

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Some hardware supports inverting the polarity of the PWM signal. This
commit adds support to the PWM framework to allow users of the PWM API
to configure the polarity. Note that in order to reduce complexity,
changing the polarity of a PWM signal is only allowed while the PWM is
disabled.

A practical example where this can prove useful is to simulate inversion
of the duty cycle. While inversion of polarity and duty cycle are not
exactly the same, the differences for most use-cases are negligible.

Signed-off-by: Philip, Avinash <[email protected]>
Signed-off-by: Thierry Reding <[email protected]>
This commit is contained in:
Philip, Avinash 2012-07-24 19:35:32 +05:30 • committed by Thierry Reding
commit 0aa0869c3c
2 changed files with 45 additions and 0 deletions
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22
drivers/pwm/core.c
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@ -378,6 +378,28 @@ 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