linux-kernel - [PATCH v2] counter/ftm-quaddec: Use device-managed registration API

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Date:   Fri, 26 Jul 2019 10:28:36 +0800
From:   Chuhong Yuan <hslester96@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Patrick Havelange <patrick.havelange@...ensium.com>,
        William Breathitt Gray <vilhelm.gray@...il.com>,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
        Chuhong Yuan <hslester96@...il.com>
Subject: [PATCH v2] counter/ftm-quaddec: Use device-managed registration API

Make use of devm_counter_register.
Then we can remove redundant unregistration API
usage to make code simpler.

Signed-off-by: Chuhong Yuan <hslester96@...il.com>
---
Changes in v2:
  - Use devm_add_action_or_reset to keep
    resource release order.
  - _remove() function is redundant now,
    delete it.

 drivers/counter/ftm-quaddec.c | 31 +++++++++++--------------------
 1 file changed, 11 insertions(+), 20 deletions(-)

diff --git a/drivers/counter/ftm-quaddec.c b/drivers/counter/ftm-quaddec.c
index 68a9b7393457..76c70a6c3593 100644
--- a/drivers/counter/ftm-quaddec.c
+++ b/drivers/counter/ftm-quaddec.c
@@ -100,16 +100,17 @@ static void ftm_quaddec_init(struct ftm_quaddec *ftm)
 	ftm_set_write_protection(ftm);
 }
 
-static void ftm_quaddec_disable(struct ftm_quaddec *ftm)
+static void ftm_quaddec_disable(void *ftm)
 {
-	ftm_clear_write_protection(ftm);
-	ftm_write(ftm, FTM_MODE, 0);
-	ftm_write(ftm, FTM_QDCTRL, 0);
+	struct ftm_quaddec *ftm_qua = ftm;

+	ftm_clear_write_protection(ftm_qua);
+	ftm_write(ftm_qua, FTM_MODE, 0);
+	ftm_write(ftm_qua, FTM_QDCTRL, 0);
 	/*
 	 * This is enough to disable the counter. No clock has been
 	 * selected by writing to FTM_SC in init()
 	 */
-	ftm_set_write_protection(ftm);
+	ftm_set_write_protection(ftm_qua);
 }
 
 static int ftm_quaddec_get_prescaler(struct counter_device *counter,
@@ -316,22 +317,13 @@ static int ftm_quaddec_probe(struct platform_device *pdev)
 	mutex_init(&ftm->ftm_quaddec_mutex);
 
 	ftm_quaddec_init(ftm);
-
-	ret = counter_register(&ftm->counter);
+	ret = devm_add_action_or_reset(&pdev->dev, ftm_quaddec_disable, ftm);
 	if (ret)
-		ftm_quaddec_disable(ftm);
-
-	return ret;
-}
-
-static int ftm_quaddec_remove(struct platform_device *pdev)
-{
-	struct ftm_quaddec *ftm = platform_get_drvdata(pdev);
-
-	counter_unregister(&ftm->counter);
-
-	ftm_quaddec_disable(ftm);
+		return ret;
 
+	ret = devm_counter_register(&pdev->dev, &ftm->counter);
+	if (ret)
+		return ret;
 	return 0;
 }
 
@@ -346,7 +338,6 @@ static struct platform_driver ftm_quaddec_driver = {
 		.of_match_table = ftm_quaddec_match,
 	},
 	.probe = ftm_quaddec_probe,
-	.remove = ftm_quaddec_remove,
 };
 
 module_platform_driver(ftm_quaddec_driver);
-- 
2.20.1