diff options
| author | Uwe Kleine-König <uwe@kleine-koenig.org> | 2019-08-24 17:37:02 +0200 |
|---|---|---|
| committer | Thierry Reding <thierry.reding@gmail.com> | 2019-09-21 01:48:54 +0200 |
| commit | fc3c5512e337bdb8b019883ea9078bbccc00c4e9 (patch) | |
| tree | 9e1c0b6e518247516c65a36b159954df65280d86 /drivers/pwm/core.c | |
| parent | pwm: rockchip: Set polarity unconditionally in .get_state() (diff) | |
| download | linux-fc3c5512e337bdb8b019883ea9078bbccc00c4e9.tar.xz linux-fc3c5512e337bdb8b019883ea9078bbccc00c4e9.zip | |
pwm: Introduce local struct pwm_chip in pwm_apply_state()
pwm->chip is dereferenced several times in the pwm_apply_state()
function. Introducing a local variable for it helps keeping some lines a
bit shorter.
Signed-off-by: Uwe Kleine-König <uwe@kleine-koenig.org>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
Diffstat (limited to 'drivers/pwm/core.c')
| -rw-r--r-- | drivers/pwm/core.c | 25 |
1 files changed, 14 insertions, 11 deletions
diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c index 8edfac17364e..4ab683a30629 100644 --- a/drivers/pwm/core.c +++ b/drivers/pwm/core.c @@ -454,20 +454,23 @@ EXPORT_SYMBOL_GPL(pwm_free); */ int pwm_apply_state(struct pwm_device *pwm, struct pwm_state *state) { + struct pwm_chip *chip; int err; if (!pwm || !state || !state->period || state->duty_cycle > state->period) return -EINVAL; + chip = pwm->chip; + if (state->period == pwm->state.period && state->duty_cycle == pwm->state.duty_cycle && state->polarity == pwm->state.polarity && state->enabled == pwm->state.enabled) return 0; - if (pwm->chip->ops->apply) { - err = pwm->chip->ops->apply(pwm->chip, pwm, state); + if (chip->ops->apply) { + err = chip->ops->apply(chip, pwm, state); if (err) return err; @@ -477,7 +480,7 @@ int pwm_apply_state(struct pwm_device *pwm, struct pwm_state *state) * FIXME: restore the initial state in case of error. */ if (state->polarity != pwm->state.polarity) { - if (!pwm->chip->ops->set_polarity) + if (!chip->ops->set_polarity) return -ENOTSUPP; /* @@ -486,12 +489,12 @@ int pwm_apply_state(struct pwm_device *pwm, struct pwm_state *state) * ->apply(). */ if (pwm->state.enabled) { - pwm->chip->ops->disable(pwm->chip, pwm); + chip->ops->disable(chip, pwm); pwm->state.enabled = false; } - err = pwm->chip->ops->set_polarity(pwm->chip, pwm, - state->polarity); + err = chip->ops->set_polarity(chip, pwm, + state->polarity); if (err) return err; @@ -500,9 +503,9 @@ int pwm_apply_state(struct pwm_device *pwm, struct pwm_state *state) if (state->period != pwm->state.period || state->duty_cycle != pwm->state.duty_cycle) { - err = pwm->chip->ops->config(pwm->chip, pwm, - state->duty_cycle, - state->period); + err = chip->ops->config(pwm->chip, pwm, + state->duty_cycle, + state->period); if (err) return err; @@ -512,11 +515,11 @@ int pwm_apply_state(struct pwm_device *pwm, struct pwm_state *state) if (state->enabled != pwm->state.enabled) { if (state->enabled) { - err = pwm->chip->ops->enable(pwm->chip, pwm); + err = chip->ops->enable(chip, pwm); if (err) return err; } else { - pwm->chip->ops->disable(pwm->chip, pwm); + chip->ops->disable(chip, pwm); } pwm->state.enabled = state->enabled; |