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pwm: twl-led: Implement .apply() callback

Browse source 
To eventually get rid of all legacy drivers convert this driver to the
modern world implementing .apply().
This just pushed a variant of pwm_apply_legacy() into the driver that was
slightly simplified because the driver doesn't provide a .set_polarity()
callback.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
This commit is contained in:
Uwe Kleine-König 2022-05-17 22:07:09 +02:00 committed by Thierry Reding
parent c449a8ca5e
commit a1bbf823e5
1 changed files with 66 additions and 10 deletions
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76
drivers/pwm/pwm-twl-led.c
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@ -137,6 +137,45 @@ static void twl4030_pwmled_disable(struct pwm_chip *chip,
mutex_unlock(&twl->mutex);
}
static int twl4030_pwmled_apply(struct pwm_chip *chip, struct pwm_device *pwm,
const struct pwm_state *state)
{
int ret;
if (state->polarity != PWM_POLARITY_NORMAL)
return -EINVAL;
if (!state->enabled) {
if (pwm->state.enabled)
twl4030_pwmled_disable(chip, pwm);
return 0;
}
/*
* We cannot skip calling ->config even if state->period ==
* pwm->state.period && state->duty_cycle == pwm->state.duty_cycle
* because we might have exited early in the last call to
* pwm_apply_state because of !state->enabled and so the two values in
* pwm->state might not be configured in hardware.
*/
ret = twl4030_pwmled_config(pwm->chip, pwm,
state->duty_cycle, state->period);
if (ret)
return ret;
if (!pwm->state.enabled)
ret = twl4030_pwmled_enable(chip, pwm);
return ret;
}
static const struct pwm_ops twl4030_pwmled_ops = {
.apply = twl4030_pwmled_apply,
.owner = THIS_MODULE,
};
static int twl6030_pwmled_config(struct pwm_chip *chip, struct pwm_device *pwm,
int duty_ns, int period_ns)
{
@ -206,6 +245,32 @@ static void twl6030_pwmled_disable(struct pwm_chip *chip,
mutex_unlock(&twl->mutex);
}
static int twl6030_pwmled_apply(struct pwm_chip *chip, struct pwm_device *pwm,
const struct pwm_state *state)
{
int err;
if (state->polarity != pwm->state.polarity)
return -EINVAL;
if (!state->enabled) {
if (pwm->state.enabled)
twl6030_pwmled_disable(chip, pwm);
return 0;
}
err = twl6030_pwmled_config(pwm->chip, pwm,
state->duty_cycle, state->period);
if (err)
return err;
if (!pwm->state.enabled)
err = twl6030_pwmled_enable(chip, pwm);
return err;
}
static int twl6030_pwmled_request(struct pwm_chip *chip, struct pwm_device *pwm)
{
struct twl_pwmled_chip *twl = to_twl(chip);
@ -257,17 +322,8 @@ static void twl6030_pwmled_free(struct pwm_chip *chip, struct pwm_device *pwm)
mutex_unlock(&twl->mutex);
}
static const struct pwm_ops twl4030_pwmled_ops = {
.enable = twl4030_pwmled_enable,
.disable = twl4030_pwmled_disable,
.config = twl4030_pwmled_config,
.owner = THIS_MODULE,
};
static const struct pwm_ops twl6030_pwmled_ops = {
.enable = twl6030_pwmled_enable,
.disable = twl6030_pwmled_disable,
.config = twl6030_pwmled_config,
.apply = twl6030_pwmled_apply,
.request = twl6030_pwmled_request,
.free = twl6030_pwmled_free,
.owner = THIS_MODULE,