linux-kernel - [PATCH 2/3] media: dw9714: move power sequences to dedicated functions

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Message-Id: <20250612-dw9714-v1-2-1a2d6d682829@emfend.at>
Date: Thu, 12 Jun 2025 08:54:11 +0200
From: Matthias Fend <matthias.fend@...end.at>
To: Sakari Ailus <sakari.ailus@...ux.intel.com>, 
 Mauro Carvalho Chehab <mchehab@...nel.org>
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Matthias Fend <matthias.fend@...end.at>, 
 bsp-development.geo@...ca-geosystems.com
Subject: [PATCH 2/3] media: dw9714: move power sequences to dedicated
 functions

Move the power-up and power-down sequences to their own functions. This is
a preparation for the upcoming powerdown pin support.

Signed-off-by: Matthias Fend <matthias.fend@...end.at>
---
 drivers/media/i2c/dw9714.c | 44 +++++++++++++++++++++++++++++---------------
 1 file changed, 29 insertions(+), 15 deletions(-)

diff --git a/drivers/media/i2c/dw9714.c b/drivers/media/i2c/dw9714.c
index 1392cddab738ce38efa18b2b9bd7821bddaa0626..2abd4fb5e7c0f02ab96bf8fa5f557941187920a3 100644
--- a/drivers/media/i2c/dw9714.c
+++ b/drivers/media/i2c/dw9714.c
@@ -137,6 +137,24 @@ static int dw9714_init_controls(struct dw9714_device *dev_vcm)
 	return hdl->error;
 }
 
+static int dw9714_power_up(struct dw9714_device *dw9714_dev)
+{
+	int ret;
+
+	ret = regulator_enable(dw9714_dev->vcc);
+	if (ret)
+		return ret;
+
+	usleep_range(1000, 2000);
+
+	return 0;
+}
+
+static int dw9714_power_down(struct dw9714_device *dw9714_dev)
+{
+	return regulator_disable(dw9714_dev->vcc);
+}
+
 static int dw9714_probe(struct i2c_client *client)
 {
 	struct dw9714_device *dw9714_dev;
@@ -151,13 +169,10 @@ static int dw9714_probe(struct i2c_client *client)
 	if (IS_ERR(dw9714_dev->vcc))
 		return PTR_ERR(dw9714_dev->vcc);
 
-	rval = regulator_enable(dw9714_dev->vcc);
-	if (rval < 0) {
-		dev_err(&client->dev, "failed to enable vcc: %d\n", rval);
-		return rval;
-	}
-
-	usleep_range(1000, 2000);
+	rval = dw9714_power_up(dw9714_dev);
+	if (rval)
+		return dev_err_probe(&client->dev, rval,
+				     "failed to power up: %d\n", rval);
 
 	v4l2_i2c_subdev_init(&dw9714_dev->sd, client, &dw9714_ops);
 	dw9714_dev->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE |
@@ -185,7 +200,7 @@ static int dw9714_probe(struct i2c_client *client)
 	return 0;
 
 err_cleanup:
-	regulator_disable(dw9714_dev->vcc);
+	dw9714_power_down(dw9714_dev);
 	v4l2_ctrl_handler_free(&dw9714_dev->ctrls_vcm);
 	media_entity_cleanup(&dw9714_dev->sd.entity);
 
@@ -200,10 +215,10 @@ static void dw9714_remove(struct i2c_client *client)
 
 	pm_runtime_disable(&client->dev);
 	if (!pm_runtime_status_suspended(&client->dev)) {
-		ret = regulator_disable(dw9714_dev->vcc);
+		ret = dw9714_power_down(dw9714_dev);
 		if (ret) {
 			dev_err(&client->dev,
-				"Failed to disable vcc: %d\n", ret);
+				"Failed to power down: %d\n", ret);
 		}
 	}
 	pm_runtime_set_suspended(&client->dev);
@@ -234,9 +249,9 @@ static int __maybe_unused dw9714_vcm_suspend(struct device *dev)
 		usleep_range(DW9714_CTRL_DELAY_US, DW9714_CTRL_DELAY_US + 10);
 	}
 
-	ret = regulator_disable(dw9714_dev->vcc);
+	ret = dw9714_power_down(dw9714_dev);
 	if (ret)
-		dev_err(dev, "Failed to disable vcc: %d\n", ret);
+		dev_err(dev, "Failed to power down: %d\n", ret);
 
 	return ret;
 }
@@ -257,12 +272,11 @@ static int __maybe_unused dw9714_vcm_resume(struct device *dev)
 	if (pm_runtime_suspended(&client->dev))
 		return 0;
 
-	ret = regulator_enable(dw9714_dev->vcc);
+	ret = dw9714_power_up(dw9714_dev);
 	if (ret) {
-		dev_err(dev, "Failed to enable vcc: %d\n", ret);
+		dev_err(dev, "Failed to power up: %d\n", ret);
 		return ret;
 	}
-	usleep_range(1000, 2000);
 
 	for (val = dw9714_dev->current_val % DW9714_CTRL_STEPS;
 	     val < dw9714_dev->current_val + DW9714_CTRL_STEPS - 1;

-- 
2.34.1