linux-kernel - Re: [PATCH] iio: ad7266: convert probe to full device-managed

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Date:   Thu, 7 Apr 2022 00:18:46 -0300
From:   Marcelo Schmitt <marcelo.schmitt1@...il.com>
To:     Maíra Canal <maira.canal@....br>
Cc:     michael.hennerich@...log.com, lars@...afoo.de, jic23@...nel.org,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iio: ad7266: convert probe to full device-managed

Hi Maíra,

On 04/06, Maíra Canal wrote:
> Convert probe functions to device-managed variants, with exception of
> the regulator, which required a devm_add_action_or_reset() hook
> registration.
> 
> Signed-off-by: Maíra Canal <maira.canal@....br>

Nice patch!
Minor nit inline.

Reviewed-by: Marcelo Schmitt <marcelo.schmitt1@...il.com>

> ---
> I apologize if you received this email more than once. For some reason, the
> patch is not showing up on the linux-iio mailing list. I believe that the
> problem was that Michael's Hennerich email on the MAINTAINERS list was
> Michael.Hennerich@...log.com instead of michael.hennerich@...log.com. Anyway,
> I am truly sorry with you received this email more than once.
> ---
>  drivers/iio/adc/ad7266.c | 43 +++++++++++++---------------------------
>  1 file changed, 14 insertions(+), 29 deletions(-)
> 
> diff --git a/drivers/iio/adc/ad7266.c b/drivers/iio/adc/ad7266.c
> index c17d9b5fbaf6..4f8f07d5c1a3 100644
> --- a/drivers/iio/adc/ad7266.c
> +++ b/drivers/iio/adc/ad7266.c
> @@ -378,6 +378,11 @@ static const char * const ad7266_gpio_labels[] = {
>  	"ad0", "ad1", "ad2",
>  };
>  
> +static void ad7266_reg_disable(void *reg)
> +{
> +	regulator_disable(reg);
> +}
> +
>  static int ad7266_probe(struct spi_device *spi)
>  {
>  	struct ad7266_platform_data *pdata = spi->dev.platform_data;
> @@ -398,9 +403,13 @@ static int ad7266_probe(struct spi_device *spi)
>  		if (ret)
>  			return ret;
>  
> +		ret = devm_add_action_or_reset(&spi->dev, ad7266_reg_disable, st->reg);
> +		if (ret)
> +			return ret;
> +
>  		ret = regulator_get_voltage(st->reg);
>  		if (ret < 0)
> -			goto error_disable_reg;
> +			return ret;
>  
>  		st->vref_mv = ret / 1000;
>  	} else {
> @@ -423,7 +432,7 @@ static int ad7266_probe(struct spi_device *spi)
>  						      GPIOD_OUT_LOW);
>  				if (IS_ERR(st->gpios[i])) {
>  					ret = PTR_ERR(st->gpios[i]);
> -					goto error_disable_reg;
> +					return ret;
>  				}
>  			}
>  		}
> @@ -459,35 +468,12 @@ static int ad7266_probe(struct spi_device *spi)
>  	spi_message_add_tail(&st->single_xfer[1], &st->single_msg);
>  	spi_message_add_tail(&st->single_xfer[2], &st->single_msg);
>  
> -	ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
> +	ret = devm_iio_triggered_buffer_setup(&spi->dev, indio_dev, &iio_pollfunc_store_time,
>  		&ad7266_trigger_handler, &iio_triggered_buffer_setup_ops);
>  	if (ret)
> -		goto error_disable_reg;
> -
> -	ret = iio_device_register(indio_dev);
> -	if (ret)
> -		goto error_buffer_cleanup;
> -
> -	return 0;
> -
> -error_buffer_cleanup:
> -	iio_triggered_buffer_cleanup(indio_dev);
> -error_disable_reg:
> -	if (!IS_ERR(st->reg))
> -		regulator_disable(st->reg);
> -
> -	return ret;
> -}
> -
> -static void ad7266_remove(struct spi_device *spi)
> -{
> -	struct iio_dev *indio_dev = spi_get_drvdata(spi);
With this removal, there is no other usage of driver_data so you may also remove
spi_set_drvdata(spi, indio_dev);

> -	struct ad7266_state *st = iio_priv(indio_dev);
> +		return ret;
>  
> -	iio_device_unregister(indio_dev);
> -	iio_triggered_buffer_cleanup(indio_dev);
> -	if (!IS_ERR(st->reg))
> -		regulator_disable(st->reg);
> +	return devm_iio_device_register(&spi->dev, indio_dev);
>  }
>  
>  static const struct spi_device_id ad7266_id[] = {
> @@ -502,7 +488,6 @@ static struct spi_driver ad7266_driver = {
>  		.name	= "ad7266",
>  	},
>  	.probe		= ad7266_probe,
> -	.remove		= ad7266_remove,
>  	.id_table	= ad7266_id,
>  };
>  module_spi_driver(ad7266_driver);
> -- 
> 2.35.1
>