[PATCH 7/9] iio: adc: at91_adc: use devm_input_allocate_device

[Alexandre Belloni <alexandre.belloni@bootlin.com>]

Use devm_input_allocate_device to allocate the input device to simplify the
error and remove paths.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
---
 drivers/iio/adc/at91_adc.c | 25 +++----------------------
 1 file changed, 3 insertions(+), 22 deletions(-)

diff --git a/drivers/iio/adc/at91_adc.c b/drivers/iio/adc/at91_adc.c
index 76aeebce6f4d..d09ceb315c5a 100644
--- a/drivers/iio/adc/at91_adc.c
+++ b/drivers/iio/adc/at91_adc.c
@@ -937,9 +937,8 @@ static int at91_ts_register(struct iio_dev *idev,
 {
 	struct at91_adc_state *st = iio_priv(idev);
 	struct input_dev *input;
-	int ret;
 
-	input = input_allocate_device();
+	input = devm_input_allocate_device(&pdev->dev);
 	if (!input) {
 		dev_err(&idev->dev, "Failed to allocate TS device!\n");
 		return -ENOMEM;
@@ -964,8 +963,7 @@ static int at91_ts_register(struct iio_dev *idev,
 		if (st->touchscreen_type != ATMEL_ADC_TOUCHSCREEN_4WIRE) {
 			dev_err(&pdev->dev,
 				"This touchscreen controller only support 4 wires\n");
-			ret = -EINVAL;
-			goto err;
+			return -EINVAL;
 		}
 
 		input_set_abs_params(input, ABS_X, 0, (1 << MAX_RLPOS_BITS) - 1,
@@ -977,20 +975,7 @@ static int at91_ts_register(struct iio_dev *idev,
 	st->ts_input = input;
 	input_set_drvdata(input, st);
 
-	ret = input_register_device(input);
-	if (ret)
-		goto err;
-
-	return ret;
-
-err:
-	input_free_device(st->ts_input);
-	return ret;
-}
-
-static void at91_ts_unregister(struct at91_adc_state *st)
-{
-	input_unregister_device(st->ts_input);
+	return input_register_device(input);
 }
 
 static int at91_adc_probe(struct platform_device *pdev)
@@ -1203,8 +1188,6 @@ static int at91_adc_probe(struct platform_device *pdev)
 	if (!st->touchscreen_type) {
 		at91_adc_trigger_remove(idev);
 		at91_adc_buffer_remove(idev);
-	} else {
-		at91_ts_unregister(st);
 	}
 error_disable_adc_clk:
 	clk_disable_unprepare(st->adc_clk);
@@ -1224,8 +1207,6 @@ static int at91_adc_remove(struct platform_device *pdev)
 	if (!st->touchscreen_type) {
 		at91_adc_trigger_remove(idev);
 		at91_adc_buffer_remove(idev);
-	} else {
-		at91_ts_unregister(st);
 	}
 	clk_disable_unprepare(st->adc_clk);
 	clk_disable_unprepare(st->clk);
-- 
2.28.0