[media] soc-camera: Add and use soc_camera_power_[on|off]() helper functions

Instead of forcing all soc-camera drivers to go through the mid-layer to
handle power management, create soc_camera_power_[on|off]() functions
that can be called from the subdev .s_power() operation to manage
regulators and platform-specific power handling. This allows non
soc-camera hosts to use soc-camera-aware clients.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
[g.liakhovetski@gmx.de: fix compile breakage]
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

14 files changed, 160 insertions, 28 deletions

diff --git a/drivers/media/i2c/soc_camera/imx074.c b/drivers/media/i2c/soc_camera/imx074.c
index 351e9bafe8fe..ade19873ed83 100644
--- a/drivers/media/i2c/soc_camera/imx074.c
+++ b/drivers/media/i2c/soc_camera/imx074.c
@@ -268,6 +268,14 @@ static int imx074_g_chip_ident(struct v4l2_subdev *sd,
 	return 0;
 }
 
+static int imx074_s_power(struct v4l2_subdev *sd, int on)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(sd);
+	struct soc_camera_link *icl = soc_camera_i2c_to_link(client);
+
+	return soc_camera_set_power(&client->dev, icl, on);
+}
+
 static int imx074_g_mbus_config(struct v4l2_subdev *sd,
 				struct v4l2_mbus_config *cfg)
 {
@@ -292,6 +300,7 @@ static struct v4l2_subdev_video_ops imx074_subdev_video_ops = {
 
 static struct v4l2_subdev_core_ops imx074_subdev_core_ops = {
 	.g_chip_ident	= imx074_g_chip_ident,
+	.s_power	= imx074_s_power,
 };
 
 static struct v4l2_subdev_ops imx074_subdev_ops = {
diff --git a/drivers/media/i2c/soc_camera/mt9m001.c b/drivers/media/i2c/soc_camera/mt9m001.c
index 00583f5fd26b..cd71230c51a9 100644
--- a/drivers/media/i2c/soc_camera/mt9m001.c
+++ b/drivers/media/i2c/soc_camera/mt9m001.c
@@ -377,6 +377,14 @@ static int mt9m001_s_register(struct v4l2_subdev *sd,
 }
 #endif
 
+static int mt9m001_s_power(struct v4l2_subdev *sd, int on)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(sd);
+	struct soc_camera_link *icl = soc_camera_i2c_to_link(client);
+
+	return soc_camera_set_power(&client->dev, icl, on);
+}
+
 static int mt9m001_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
 {
 	struct mt9m001 *mt9m001 = container_of(ctrl->handler,
@@ -566,6 +574,7 @@ static struct v4l2_subdev_core_ops mt9m001_subdev_core_ops = {
 	.g_register	= mt9m001_g_register,
 	.s_register	= mt9m001_s_register,
 #endif
+	.s_power	= mt9m001_s_power,
 };
 
 static int mt9m001_enum_fmt(struct v4l2_subdev *sd, unsigned int index,
diff --git a/drivers/media/i2c/soc_camera/mt9m111.c b/drivers/media/i2c/soc_camera/mt9m111.c
index 863d722dda06..e555f7739691 100644
--- a/drivers/media/i2c/soc_camera/mt9m111.c
+++ b/drivers/media/i2c/soc_camera/mt9m111.c
@@ -831,10 +831,37 @@ static int mt9m111_video_probe(struct i2c_client *client)
 	return v4l2_ctrl_handler_setup(&mt9m111->hdl);
 }
 
+static int mt9m111_power_on(struct mt9m111 *mt9m111)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(&mt9m111->subdev);
+	struct soc_camera_link *icl = soc_camera_i2c_to_link(client);
+	int ret;
+
+	ret = soc_camera_power_on(&client->dev, icl);
+	if (ret < 0)
+		return ret;
+
+	ret = mt9m111_resume(mt9m111);
+	if (ret < 0) {
+		dev_err(&client->dev, "Failed to resume the sensor: %d\n", ret);
+		soc_camera_power_off(&client->dev, icl);
+	}
+
+	return ret;
+}
+
+static void mt9m111_power_off(struct mt9m111 *mt9m111)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(&mt9m111->subdev);
+	struct soc_camera_link *icl = soc_camera_i2c_to_link(client);
+
+	mt9m111_suspend(mt9m111);
+	soc_camera_power_off(&client->dev, icl);
+}
+
 static int mt9m111_s_power(struct v4l2_subdev *sd, int on)
 {
 	struct mt9m111 *mt9m111 = container_of(sd, struct mt9m111, subdev);
-	struct i2c_client *client = v4l2_get_subdevdata(sd);
 	int ret = 0;
 
 	mutex_lock(&mt9m111->power_lock);
@@ -844,23 +871,18 @@ static int mt9m111_s_power(struct v4l2_subdev *sd, int on)
 	 * update the power state.
 	 */
 	if (mt9m111->power_count == !on) {
-		if (on) {
-			ret = mt9m111_resume(mt9m111);
-			if (ret) {
-				dev_err(&client->dev,
-					"Failed to resume the sensor: %d\n", ret);
-				goto out;
-			}
-		} else {
-			mt9m111_suspend(mt9m111);
-		}
+		if (on)
+			ret = mt9m111_power_on(mt9m111);
+		else
+			mt9m111_power_off(mt9m111);
 	}
 
-	/* Update the power count. */
-	mt9m111->power_count += on ? 1 : -1;
-	WARN_ON(mt9m111->power_count < 0);
+	if (!ret) {
+		/* Update the power count. */
+		mt9m111->power_count += on ? 1 : -1;
+		WARN_ON(mt9m111->power_count < 0);
+	}
 
-out:
 	mutex_unlock(&mt9m111->power_lock);
 	return ret;
 }
diff --git a/drivers/media/i2c/soc_camera/mt9t031.c b/drivers/media/i2c/soc_camera/mt9t031.c
index 1415074138a5..9666e202e395 100644
--- a/drivers/media/i2c/soc_camera/mt9t031.c
+++ b/drivers/media/i2c/soc_camera/mt9t031.c
@@ -616,12 +616,19 @@ static struct device_type mt9t031_dev_type = {
 static int mt9t031_s_power(struct v4l2_subdev *sd, int on)
 {
 	struct i2c_client *client = v4l2_get_subdevdata(sd);
+	struct soc_camera_link *icl = soc_camera_i2c_to_link(client);
 	struct video_device *vdev = soc_camera_i2c_to_vdev(client);
+	int ret;
 
-	if (on)
+	if (on) {
+		ret = soc_camera_power_on(&client->dev, icl);
+		if (ret < 0)
+			return ret;
 		vdev->dev.type = &mt9t031_dev_type;
-	else
+	} else {
 		vdev->dev.type = NULL;
+		soc_camera_power_off(&client->dev, icl);
+	}
 
 	return 0;
 }
diff --git a/drivers/media/i2c/soc_camera/mt9t112.c b/drivers/media/i2c/soc_camera/mt9t112.c
index e1ae46a7ee96..624ceec44e18 100644
--- a/drivers/media/i2c/soc_camera/mt9t112.c
+++ b/drivers/media/i2c/soc_camera/mt9t112.c
@@ -776,12 +776,21 @@ static int mt9t112_s_register(struct v4l2_subdev *sd,
 }
 #endif
 
+static int mt9t112_s_power(struct v4l2_subdev *sd, int on)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(sd);
+	struct soc_camera_link *icl = soc_camera_i2c_to_link(client);
+
+	return soc_camera_set_power(&client->dev, icl, on);
+}
+
 static struct v4l2_subdev_core_ops mt9t112_subdev_core_ops = {
 	.g_chip_ident	= mt9t112_g_chip_ident,
 #ifdef CONFIG_VIDEO_ADV_DEBUG
 	.g_register	= mt9t112_g_register,
 	.s_register	= mt9t112_s_register,
 #endif
+	.s_power	= mt9t112_s_power,
 };
 
 
diff --git a/drivers/media/i2c/soc_camera/mt9v022.c b/drivers/media/i2c/soc_camera/mt9v022.c
index 72479247522a..5f09cb702bf7 100644
--- a/drivers/media/i2c/soc_camera/mt9v022.c
+++ b/drivers/media/i2c/soc_camera/mt9v022.c
@@ -445,6 +445,14 @@ static int mt9v022_s_register(struct v4l2_subdev *sd,
 }
 #endif
 
+static int mt9v022_s_power(struct v4l2_subdev *sd, int on)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(sd);
+	struct soc_camera_link *icl = soc_camera_i2c_to_link(client);
+
+	return soc_camera_set_power(&client->dev, icl, on);
+}
+
 static int mt9v022_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
 {
 	struct mt9v022 *mt9v022 = container_of(ctrl->handler,
@@ -664,6 +672,7 @@ static struct v4l2_subdev_core_ops mt9v022_subdev_core_ops = {
 	.g_register	= mt9v022_g_register,
 	.s_register	= mt9v022_s_register,
 #endif
+	.s_power	= mt9v022_s_power,
 };
 
 static int mt9v022_enum_fmt(struct v4l2_subdev *sd, unsigned int index,
diff --git a/drivers/media/i2c/soc_camera/ov2640.c b/drivers/media/i2c/soc_camera/ov2640.c
index 7c44d1fe3c87..16ed091c702d 100644
--- a/drivers/media/i2c/soc_camera/ov2640.c
+++ b/drivers/media/i2c/soc_camera/ov2640.c
@@ -742,6 +742,14 @@ static int ov2640_s_register(struct v4l2_subdev *sd,
 }
 #endif
 
+static int ov2640_s_power(struct v4l2_subdev *sd, int on)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(sd);
+	struct soc_camera_link *icl = soc_camera_i2c_to_link(client);
+
+	return soc_camera_set_power(&client->dev, icl, on);
+}
+
 /* Select the nearest higher resolution for capture */
 static const struct ov2640_win_size *ov2640_select_win(u32 *width, u32 *height)
 {
@@ -988,6 +996,7 @@ static struct v4l2_subdev_core_ops ov2640_subdev_core_ops = {
 	.g_register	= ov2640_g_register,
 	.s_register	= ov2640_s_register,
 #endif
+	.s_power	= ov2640_s_power,
 };
 
 static int ov2640_g_mbus_config(struct v4l2_subdev *sd,
diff --git a/drivers/media/i2c/soc_camera/ov5642.c b/drivers/media/i2c/soc_camera/ov5642.c
index 0bc93313d37a..61824c6911d5 100644
--- a/drivers/media/i2c/soc_camera/ov5642.c
+++ b/drivers/media/i2c/soc_camera/ov5642.c
@@ -933,13 +933,17 @@ static int ov5642_g_mbus_config(struct v4l2_subdev *sd,
 
 static int ov5642_s_power(struct v4l2_subdev *sd, int on)
 {
-	struct i2c_client *client;
+	struct i2c_client *client = v4l2_get_subdevdata(sd);
+	struct soc_camera_link *icl = soc_camera_i2c_to_link(client);
 	int ret;
 
 	if (!on)
-		return 0;
+		return soc_camera_power_off(&client->dev, icl);
+
+	ret = soc_camera_power_on(&client->dev, icl);
+	if (ret < 0)
+		return ret;
 
-	client = v4l2_get_subdevdata(sd);
 	ret = ov5642_write_array(client, ov5642_default_regs_init);
 	if (!ret)
 		ret = ov5642_set_resolution(sd);
diff --git a/drivers/media/i2c/soc_camera/ov6650.c b/drivers/media/i2c/soc_camera/ov6650.c
index 3e028b1970dd..12d57a5dd810 100644
--- a/drivers/media/i2c/soc_camera/ov6650.c
+++ b/drivers/media/i2c/soc_camera/ov6650.c
@@ -432,6 +432,14 @@ static int ov6650_set_register(struct v4l2_subdev *sd,
 }
 #endif
 
+static int ov6650_s_power(struct v4l2_subdev *sd, int on)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(sd);
+	struct soc_camera_link *icl = soc_camera_i2c_to_link(client);
+
+	return soc_camera_set_power(&client->dev, icl, on);
+}
+
 static int ov6650_g_crop(struct v4l2_subdev *sd, struct v4l2_crop *a)
 {
 	struct i2c_client *client = v4l2_get_subdevdata(sd);
@@ -866,6 +874,7 @@ static struct v4l2_subdev_core_ops ov6650_core_ops = {
 	.g_register		= ov6650_get_register,
 	.s_register		= ov6650_set_register,
 #endif
+	.s_power		= ov6650_s_power,
 };
 
 /* Request bus settings on camera side */
diff --git a/drivers/media/i2c/soc_camera/ov772x.c b/drivers/media/i2c/soc_camera/ov772x.c
index 6d79b89b8603..a022662da98a 100644
--- a/drivers/media/i2c/soc_camera/ov772x.c
+++ b/drivers/media/i2c/soc_camera/ov772x.c
@@ -683,6 +683,14 @@ static int ov772x_s_register(struct v4l2_subdev *sd,
 }
 #endif
 
+static int ov772x_s_power(struct v4l2_subdev *sd, int on)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(sd);
+	struct soc_camera_link *icl = soc_camera_i2c_to_link(client);
+
+	return soc_camera_set_power(&client->dev, icl, on);
+}
+
 static const struct ov772x_win_size *ov772x_select_win(u32 width, u32 height)
 {
 	__u32 diff;
@@ -996,6 +1004,7 @@ static struct v4l2_subdev_core_ops ov772x_subdev_core_ops = {
 	.g_register	= ov772x_g_register,
 	.s_register	= ov772x_s_register,
 #endif
+	.s_power	= ov772x_s_power,
 };
 
 static int ov772x_enum_fmt(struct v4l2_subdev *sd, unsigned int index,
diff --git a/drivers/media/i2c/soc_camera/ov9640.c b/drivers/media/i2c/soc_camera/ov9640.c
index 9ed4ba4236c4..53156ef1ec0c 100644
--- a/drivers/media/i2c/soc_camera/ov9640.c
+++ b/drivers/media/i2c/soc_camera/ov9640.c
@@ -333,6 +333,14 @@ static int ov9640_set_register(struct v4l2_subdev *sd,
 }
 #endif
 
+static int ov9640_s_power(struct v4l2_subdev *sd, int on)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(sd);
+	struct soc_camera_link *icl = soc_camera_i2c_to_link(client);
+
+	return soc_camera_set_power(&client->dev, icl, on);
+}
+
 /* select nearest higher resolution for capture */
 static void ov9640_res_roundup(u32 *width, u32 *height)
 {
@@ -632,7 +640,7 @@ static struct v4l2_subdev_core_ops ov9640_core_ops = {
 	.g_register		= ov9640_get_register,
 	.s_register		= ov9640_set_register,
 #endif
-
+	.s_power		= ov9640_s_power,
 };
 
 /* Request bus settings on camera side */
diff --git a/drivers/media/i2c/soc_camera/ov9740.c b/drivers/media/i2c/soc_camera/ov9740.c
index 3eb07c22516e..10c0ba9f5bcd 100644
--- a/drivers/media/i2c/soc_camera/ov9740.c
+++ b/drivers/media/i2c/soc_camera/ov9740.c
@@ -786,17 +786,27 @@ static int ov9740_g_chip_ident(struct v4l2_subdev *sd,
 
 static int ov9740_s_power(struct v4l2_subdev *sd, int on)
 {
+	struct i2c_client *client = v4l2_get_subdevdata(sd);
+	struct soc_camera_link *icl = soc_camera_i2c_to_link(client);
 	struct ov9740_priv *priv = to_ov9740(sd);
-
-	if (!priv->current_enable)
-		return 0;
+	int ret;
 
 	if (on) {
-		ov9740_s_fmt(sd, &priv->current_mf);
-		ov9740_s_stream(sd, priv->current_enable);
+		ret = soc_camera_power_on(&client->dev, icl);
+		if (ret < 0)
+			return ret;
+
+		if (priv->current_enable) {
+			ov9740_s_fmt(sd, &priv->current_mf);
+			ov9740_s_stream(sd, 1);
+		}
 	} else {
-		ov9740_s_stream(sd, 0);
-		priv->current_enable = true;
+		if (priv->current_enable) {
+			ov9740_s_stream(sd, 0);
+			priv->current_enable = true;
+		}
+
+		soc_camera_power_off(&client->dev, icl);
 	}
 
 	return 0;
diff --git a/drivers/media/i2c/soc_camera/rj54n1cb0c.c b/drivers/media/i2c/soc_camera/rj54n1cb0c.c
index f6419b22c258..ca1cee7c66cb 100644
--- a/drivers/media/i2c/soc_camera/rj54n1cb0c.c
+++ b/drivers/media/i2c/soc_camera/rj54n1cb0c.c
@@ -1180,6 +1180,14 @@ static int rj54n1_s_register(struct v4l2_subdev *sd,
 }
 #endif
 
+static int rj54n1_s_power(struct v4l2_subdev *sd, int on)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(sd);
+	struct soc_camera_link *icl = soc_camera_i2c_to_link(client);
+
+	return soc_camera_set_power(&client->dev, icl, on);
+}
+
 static int rj54n1_s_ctrl(struct v4l2_ctrl *ctrl)
 {
 	struct rj54n1 *rj54n1 = container_of(ctrl->handler, struct rj54n1, hdl);
@@ -1230,6 +1238,7 @@ static struct v4l2_subdev_core_ops rj54n1_subdev_core_ops = {
 	.g_register	= rj54n1_g_register,
 	.s_register	= rj54n1_s_register,
 #endif
+	.s_power	= rj54n1_s_power,
 };
 
 static int rj54n1_g_mbus_config(struct v4l2_subdev *sd,
diff --git a/drivers/media/i2c/soc_camera/tw9910.c b/drivers/media/i2c/soc_camera/tw9910.c
index 9f53eacb66e3..f28365051878 100644
--- a/drivers/media/i2c/soc_camera/tw9910.c
+++ b/drivers/media/i2c/soc_camera/tw9910.c
@@ -566,6 +566,14 @@ static int tw9910_s_register(struct v4l2_subdev *sd,
 }
 #endif
 
+static int tw9910_s_power(struct v4l2_subdev *sd, int on)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(sd);
+	struct soc_camera_link *icl = soc_camera_i2c_to_link(client);
+
+	return soc_camera_set_power(&client->dev, icl, on);
+}
+
 static int tw9910_set_frame(struct v4l2_subdev *sd, u32 *width, u32 *height)
 {
 	struct i2c_client *client = v4l2_get_subdevdata(sd);
@@ -814,6 +822,7 @@ static struct v4l2_subdev_core_ops tw9910_subdev_core_ops = {
 	.g_register	= tw9910_g_register,
 	.s_register	= tw9910_s_register,
 #endif
+	.s_power	= tw9910_s_power,
 };
 
 static int tw9910_enum_fmt(struct v4l2_subdev *sd, unsigned int index,