iio: adc: ad7780: convert to device-managed functions

With the devm_ad_sd_setup_buffer_and_trigger() helper, it's a bit easier
now to convert the probe of the AD7780 driver to use device-managed
functions.

Only the regulator disable requires a devm_add_action_or_reset() callback.

This change does that, cleaning up the driver a bit.

Signed-off-by: Alexandru Ardelean <aardelean@deviqon.com>
Link: https://lore.kernel.org/r/20210513120752.90074-9-aardelean@deviqon.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/adc/ad7780.c b/drivers/iio/adc/ad7780.c
index 42e7e8e..42bb952 100644 (file)
--- a/drivers/iio/adc/ad7780.c
+++ b/drivers/iio/adc/ad7780.c
@@ -300,6 +300,11 @@ static int ad7780_init_gpios(struct device *dev, struct ad7780_state *st)
        return 0;
 }
 
+static void ad7780_reg_disable(void *reg)
+{
+       regulator_disable(reg);
+}
+
 static int ad7780_probe(struct spi_device *spi)
 {
        struct ad7780_state *st;
@@ -318,8 +323,6 @@ static int ad7780_probe(struct spi_device *spi)
        st->chip_info =
                &ad7780_chip_info_tbl[spi_get_device_id(spi)->driver_data];
 
-       spi_set_drvdata(spi, indio_dev);
-
        indio_dev->name = spi_get_device_id(spi)->name;
        indio_dev->modes = INDIO_DIRECT_MODE;
        indio_dev->channels = &st->chip_info->channel;
@@ -340,35 +343,15 @@ static int ad7780_probe(struct spi_device *spi)
                return ret;
        }
 
-       ret = ad_sd_setup_buffer_and_trigger(indio_dev);
+       ret = devm_add_action_or_reset(&spi->dev, ad7780_reg_disable, st->reg);
        if (ret)
-               goto error_disable_reg;
+               return ret;
 
-       ret = iio_device_register(indio_dev);
+       ret = devm_ad_sd_setup_buffer_and_trigger(&spi->dev, indio_dev);
        if (ret)
-               goto error_cleanup_buffer_and_trigger;
-
-       return 0;
-
-error_cleanup_buffer_and_trigger:
-       ad_sd_cleanup_buffer_and_trigger(indio_dev);
-error_disable_reg:
-       regulator_disable(st->reg);
-
-       return ret;
-}
-
-static int ad7780_remove(struct spi_device *spi)
-{
-       struct iio_dev *indio_dev = spi_get_drvdata(spi);
-       struct ad7780_state *st = iio_priv(indio_dev);
-
-       iio_device_unregister(indio_dev);
-       ad_sd_cleanup_buffer_and_trigger(indio_dev);
-
-       regulator_disable(st->reg);
+               return ret;
 
-       return 0;
+       return devm_iio_device_register(&spi->dev, indio_dev);
 }
 
 static const struct spi_device_id ad7780_id[] = {
@@ -385,7 +368,6 @@ static struct spi_driver ad7780_driver = {
                .name   = "ad7780",
        },
        .probe          = ad7780_probe,
-       .remove         = ad7780_remove,
        .id_table       = ad7780_id,
 };
 module_spi_driver(ad7780_driver);