[PATCH] staging: iio: ad5933: rework probe to use devm_ function variants

[Alexandru Ardelean]

This change cleans up the driver's probe function to use only devm_
function variants. This also gets rid of the remove function and moves the
clock & regulator de-initializations to the 'ad5933_cleanup()' callback.

Signed-off-by: Alexandru Ardelean <alexandru.ardel...@analog.com>
---
 .../staging/iio/impedance-analyzer/ad5933.c   | 59 ++++++++-----------
 1 file changed, 23 insertions(+), 36 deletions(-)

diff --git a/drivers/staging/iio/impedance-analyzer/ad5933.c 
b/drivers/staging/iio/impedance-analyzer/ad5933.c
index af0bcf95ee8a..06a6dcd7883b 100644
--- a/drivers/staging/iio/impedance-analyzer/ad5933.c
+++ b/drivers/staging/iio/impedance-analyzer/ad5933.c
@@ -602,11 +602,12 @@ static const struct iio_buffer_setup_ops 
ad5933_ring_setup_ops = {
        .postdisable = ad5933_ring_postdisable,
 };
 
-static int ad5933_register_ring_funcs_and_init(struct iio_dev *indio_dev)
+static int ad5933_register_ring_funcs_and_init(struct device *dev,
+                                              struct iio_dev *indio_dev)
 {
        struct iio_buffer *buffer;
 
-       buffer = iio_kfifo_allocate();
+       buffer = devm_iio_kfifo_allocate(dev);
        if (!buffer)
                return -ENOMEM;
 
@@ -676,6 +677,14 @@ static void ad5933_work(struct work_struct *work)
        }
 }
 
+static void ad5933_cleanup(void *data)
+{
+       struct ad5933_state *st = data;
+
+       clk_disable_unprepare(st->mclk);
+       regulator_disable(st->reg);
+}
+
 static int ad5933_probe(struct i2c_client *client,
                        const struct i2c_device_id *id)
 {
@@ -703,23 +712,28 @@ static int ad5933_probe(struct i2c_client *client,
                dev_err(&client->dev, "Failed to enable specified VDD 
supply\n");
                return ret;
        }
+
+       ret = devm_add_action_or_reset(&client->dev, ad5933_cleanup, st);
+       if (ret)
+               return ret;
+
        ret = regulator_get_voltage(st->reg);
 
        if (ret < 0)
-               goto error_disable_reg;
+               return ret;
 
        st->vref_mv = ret / 1000;
 
        st->mclk = devm_clk_get(&client->dev, "mclk");
        if (IS_ERR(st->mclk) && PTR_ERR(st->mclk) != -ENOENT) {
                ret = PTR_ERR(st->mclk);
-               goto error_disable_reg;
+               return ret;
        }
 
        if (!IS_ERR(st->mclk)) {
                ret = clk_prepare_enable(st->mclk);
                if (ret < 0)
-                       goto error_disable_reg;
+                       return ret;
                ext_clk_hz = clk_get_rate(st->mclk);
        }
 
@@ -742,41 +756,15 @@ static int ad5933_probe(struct i2c_client *client,
        indio_dev->channels = ad5933_channels;
        indio_dev->num_channels = ARRAY_SIZE(ad5933_channels);
 
-       ret = ad5933_register_ring_funcs_and_init(indio_dev);
+       ret = ad5933_register_ring_funcs_and_init(&client->dev, indio_dev);
        if (ret)
-               goto error_disable_mclk;
+               return ret;
 
        ret = ad5933_setup(st);
        if (ret)
-               goto error_unreg_ring;
-
-       ret = iio_device_register(indio_dev);
-       if (ret)
-               goto error_unreg_ring;
-
-       return 0;
-
-error_unreg_ring:
-       iio_kfifo_free(indio_dev->buffer);
-error_disable_mclk:
-       clk_disable_unprepare(st->mclk);
-error_disable_reg:
-       regulator_disable(st->reg);
-
-       return ret;
-}
-
-static int ad5933_remove(struct i2c_client *client)
-{
-       struct iio_dev *indio_dev = i2c_get_clientdata(client);
-       struct ad5933_state *st = iio_priv(indio_dev);
-
-       iio_device_unregister(indio_dev);
-       iio_kfifo_free(indio_dev->buffer);
-       regulator_disable(st->reg);
-       clk_disable_unprepare(st->mclk);
+               return ret;
 
-       return 0;
+       return devm_iio_device_register(&client->dev, indio_dev);
 }
 
 static const struct i2c_device_id ad5933_id[] = {
@@ -801,7 +789,6 @@ static struct i2c_driver ad5933_driver = {
                .of_match_table = ad5933_of_match,
        },
        .probe = ad5933_probe,
-       .remove = ad5933_remove,
        .id_table = ad5933_id,
 };
 module_i2c_driver(ad5933_driver);
-- 
2.17.1