On Tue, Apr 06, 2021 at 06:41:40PM +0200, Clemens Gruber wrote:
> Regmap operations can fail if the underlying subsystem is not working
> properly (e.g. hogged I2C bus, etc.)
> As this is useful information for the user, print an error message if it
> happens.
> Let probe fail if the first regmap_read or the first regmap_write fails.
>
> Signed-off-by: Clemens Gruber <clemens.gru...@pqgruber.com>
> ---
> Changes since v6:
> - Rebased
>
> drivers/pwm/pwm-pca9685.c | 83 ++++++++++++++++++++++++++++-----------
> 1 file changed, 59 insertions(+), 24 deletions(-)
>
> diff --git a/drivers/pwm/pwm-pca9685.c b/drivers/pwm/pwm-pca9685.c
> index cf0c98e4ef44..8a4993882b40 100644
> --- a/drivers/pwm/pwm-pca9685.c
> +++ b/drivers/pwm/pwm-pca9685.c
> @@ -107,6 +107,30 @@ static bool pca9685_prescaler_can_change(struct pca9685
> *pca, int channel)
> return test_bit(channel, pca->pwms_enabled);
> }
>
> +static int pca9685_read_reg(struct pca9685 *pca, unsigned int reg, unsigned
> int *val)
> +{
> + struct device *dev = pca->chip.dev;
> + int err;
> +
> + err = regmap_read(pca->regmap, reg, val);
> + if (err != 0)
> + dev_err(dev, "regmap_read of register 0x%x failed: %d\n", reg,
> err);
Please use %pe to emit the error code instead of %d.
> +
> + return err;
> +}
> +
> +static int pca9685_write_reg(struct pca9685 *pca, unsigned int reg, unsigned
> int val)
> +{
> + struct device *dev = pca->chip.dev;
> + int err;
> +
> + err = regmap_write(pca->regmap, reg, val);
> + if (err != 0)
> + dev_err(dev, "regmap_write to register 0x%x failed: %d\n", reg,
> err);
> +
> + return err;
> +}
> +
> /* Helper function to set the duty cycle ratio to duty/4096 (e.g. duty=2048
> -> 50%) */
> static void pca9685_pwm_set_duty(struct pca9685 *pca, int channel, unsigned
> int duty)
> {
> @@ -115,12 +139,12 @@ static void pca9685_pwm_set_duty(struct pca9685 *pca,
> int channel, unsigned int
>
> if (duty == 0) {
> /* Set the full OFF bit, which has the highest precedence */
> - regmap_write(pca->regmap, REG_OFF_H(channel), LED_FULL);
> + pca9685_write_reg(pca, REG_OFF_H(channel), LED_FULL);
You didn't check all return codes? How did you select the calls to
check?
Best regards
Uwe
--
Pengutronix e.K. | Uwe Kleine-König |
Industrial Linux Solutions | https://www.pengutronix.de/ |
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