Prepare the transition to PWM atomic update by moving the enabled/disabled state into the pwm_state struct. This way we can easily update the whole PWM state by copying the new state in the ->state field.
Signed-off-by: Boris Brezillon boris.brezillon@free-electrons.com --- drivers/pwm/core.c | 13 +++++++++---- include/linux/pwm.h | 11 ++++++++--- 2 files changed, 17 insertions(+), 7 deletions(-)
diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c index f3f91e7..c240b54 100644 --- a/drivers/pwm/core.c +++ b/drivers/pwm/core.c @@ -499,10 +499,10 @@ int pwm_enable(struct pwm_device *pwm) if (!pwm) return -EINVAL;
- if (!test_and_set_bit(PWMF_ENABLED, &pwm->flags)) { + if (!pwm_is_enabled(pwm)) { err = pwm->chip->ops->enable(pwm->chip, pwm); - if (err) - clear_bit(PWMF_ENABLED, &pwm->flags); + if (!err) + pwm->state.enabled = true; }
return err; @@ -515,8 +515,13 @@ EXPORT_SYMBOL_GPL(pwm_enable); */ void pwm_disable(struct pwm_device *pwm) { - if (pwm && test_and_clear_bit(PWMF_ENABLED, &pwm->flags)) + if (!pwm) + return; + + if (pwm_is_enabled(pwm)) { pwm->chip->ops->disable(pwm->chip, pwm); + pwm->state.enabled = false; + } } EXPORT_SYMBOL_GPL(pwm_disable);
diff --git a/include/linux/pwm.h b/include/linux/pwm.h index f0f0f37..55bf463 100644 --- a/include/linux/pwm.h +++ b/include/linux/pwm.h @@ -93,8 +93,7 @@ struct pwm_args {
enum { PWMF_REQUESTED = 1 << 0, - PWMF_ENABLED = 1 << 1, - PWMF_EXPORTED = 1 << 2, + PWMF_EXPORTED = 1 << 1, };
/* @@ -102,11 +101,13 @@ enum { * @period: PWM period (in nanoseconds) * @duty_cycle: PWM duty cycle (in nanoseconds) * @polarity: PWM polarity + * @enabled: PWM enabled status */ struct pwm_state { unsigned int period; unsigned int duty_cycle; enum pwm_polarity polarity; + bool enabled; };
/** @@ -145,7 +146,11 @@ static inline void pwm_get_state(const struct pwm_device *pwm,
static inline bool pwm_is_enabled(const struct pwm_device *pwm) { - return test_bit(PWMF_ENABLED, &pwm->flags); + struct pwm_state pstate; + + pwm_get_state(pwm, &pstate); + + return pstate.enabled; }
static inline void pwm_set_period(struct pwm_device *pwm, unsigned int period)