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pwm: stmpe: Handle errors when disabling the signal 

Before the pwm framework implementedatomic updates (with the .apply()
callback) the .disable() callback returned void. This is still visible
in the stmpe driver which drops errors in the disable path.

Improve the driver to forward failures in stmpe_24xx_pwm_disable() to
the caller of pwm_apply_state().

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 2023-07-14 23:45:18 +02:00 committed by Thierry Reding
parent 8c89fd866a
commit b2c71e9f8d
1 changed files with 9 additions and 8 deletions
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17
drivers/pwm/pwm-stmpe.c
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@ -61,8 +61,8 @@ static int stmpe_24xx_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
return 0;
}
static void stmpe_24xx_pwm_disable(struct pwm_chip *chip,
struct pwm_device *pwm)
static int stmpe_24xx_pwm_disable(struct pwm_chip *chip,
struct pwm_device *pwm)
{
struct stmpe_pwm *stmpe_pwm = to_stmpe_pwm(chip);
u8 value;
@ -72,17 +72,16 @@ static void stmpe_24xx_pwm_disable(struct pwm_chip *chip,
if (ret < 0) {
dev_err(chip->dev, "error reading PWM#%u control\n",
pwm->hwpwm);
return;
return ret;
}
value = ret & ~BIT(pwm->hwpwm);
ret = stmpe_reg_write(stmpe_pwm->stmpe, STMPE24XX_PWMCS, value);
if (ret) {
if (ret)
dev_err(chip->dev, "error writing PWM#%u control\n",
pwm->hwpwm);
return;
}
return ret;
}
/* STMPE 24xx PWM instructions */
@ -111,7 +110,9 @@ static int stmpe_24xx_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
/* Make sure we are disabled */
if (pwm_is_enabled(pwm)) {
stmpe_24xx_pwm_disable(chip, pwm);
ret = stmpe_24xx_pwm_disable(chip, pwm);
if (ret)
return ret;
} else {
/* Connect the PWM to the pin */
pin = pwm->hwpwm;
@ -269,7 +270,7 @@ static int stmpe_24xx_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
if (!state->enabled) {
if (pwm->state.enabled)
stmpe_24xx_pwm_disable(chip, pwm);
return stmpe_24xx_pwm_disable(chip, pwm);
return 0;
}