iio: adc: ad7887: convert probe to device-managed functions

This is conversion of the driver to use device-managed functions.
The IIO registration and triggered buffer setup both have device-managed
versions.
The regulator disable needs to be handled via an action_or_reset handler.

With these changes, the remove hook is removed, and the error path is
cleaned up in probe.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Link: https://lore.kernel.org/r/20201113091648.148589-1-alexandru.ardelean@analog.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/adc/ad7887.c b/drivers/iio/adc/ad7887.c
index 99a480a..4f6f0e0 100644 (file)
--- a/drivers/iio/adc/ad7887.c
+++ b/drivers/iio/adc/ad7887.c
@@ -232,6 +232,13 @@ static const struct iio_info ad7887_info = {
        .read_raw = &ad7887_read_raw,
 };
 
+static void ad7887_reg_disable(void *data)
+{
+       struct regulator *reg = data;
+
+       regulator_disable(reg);
+}
+
 static int ad7887_probe(struct spi_device *spi)
 {
        struct ad7887_platform_data *pdata = spi->dev.platform_data;
@@ -258,6 +265,10 @@ static int ad7887_probe(struct spi_device *spi)
                ret = regulator_enable(st->reg);
                if (ret)
                        return ret;
+
+               ret = devm_add_action_or_reset(&spi->dev, ad7887_reg_disable, st->reg);
+               if (ret)
+                       return ret;
        }
 
        st->chip_info =
@@ -316,36 +327,13 @@ static int ad7887_probe(struct spi_device *spi)
                indio_dev->num_channels = st->chip_info->num_channels;
        }
 
-       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,
                        &ad7887_trigger_handler, &ad7887_ring_setup_ops);
        if (ret)
-               goto error_disable_reg;
-
-       ret = iio_device_register(indio_dev);
-       if (ret)
-               goto error_unregister_ring;
-
-       return 0;
-error_unregister_ring:
-       iio_triggered_buffer_cleanup(indio_dev);
-error_disable_reg:
-       if (st->reg)
-               regulator_disable(st->reg);
-
-       return ret;
-}
-
-static int ad7887_remove(struct spi_device *spi)
-{
-       struct iio_dev *indio_dev = spi_get_drvdata(spi);
-       struct ad7887_state *st = iio_priv(indio_dev);
-
-       iio_device_unregister(indio_dev);
-       iio_triggered_buffer_cleanup(indio_dev);
-       if (st->reg)
-               regulator_disable(st->reg);
+               return ret;
 
-       return 0;
+       return devm_iio_device_register(&spi->dev, indio_dev);
 }
 
 static const struct spi_device_id ad7887_id[] = {
@@ -359,7 +347,6 @@ static struct spi_driver ad7887_driver = {
                .name   = "ad7887",
        },
        .probe          = ad7887_probe,
-       .remove         = ad7887_remove,
        .id_table       = ad7887_id,
 };
 module_spi_driver(ad7887_driver);