linux-kernel - [PATCH] media: i2c: tvp514x: add support for asynchronous probing

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Date:	Sat, 22 Jun 2013 15:46:29 +0530
From:	Prabhakar Lad <prabhakar.csengg@...il.com>
To:	Mauro Carvalho Chehab <mchehab@...hat.com>,
	LMML <linux-media@...r.kernel.org>,
	Hans Verkuil <hans.verkuil@...co.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:	DLOS <davinci-linux-open-source@...ux.davincidsp.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"Lad, Prabhakar" <prabhakar.csengg@...il.com>,
	Guennadi Liakhovetski <g.liakhovetski@....de>,
	Hans Verkuil <hverkuil@...all.nl>,
	Sakari Ailus <sakari.ailus@....fi>
Subject: [PATCH] media: i2c: tvp514x: add support for asynchronous probing

From: "Lad, Prabhakar" <prabhakar.csengg@...il.com>

Both synchronous and asynchronous tvp514x subdevice probing is supported by
this patch.

Signed-off-by: Prabhakar Lad <prabhakar.csengg@...il.com>
Cc: Guennadi Liakhovetski <g.liakhovetski@....de>
Cc: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc: Hans Verkuil <hverkuil@...all.nl>
Cc: Sakari Ailus <sakari.ailus@....fi>
Cc: Mauro Carvalho Chehab <mchehab@...hat.com>
---
 drivers/media/i2c/tvp514x.c |   22 +++++++++++++++-------
 1 file changed, 15 insertions(+), 7 deletions(-)

diff --git a/drivers/media/i2c/tvp514x.c b/drivers/media/i2c/tvp514x.c
index 864eb14..d090caf 100644
--- a/drivers/media/i2c/tvp514x.c
+++ b/drivers/media/i2c/tvp514x.c
@@ -36,6 +36,7 @@
 #include <linux/module.h>
 #include <linux/v4l2-mediabus.h>
 
+#include <media/v4l2-async.h>
 #include <media/v4l2-device.h>
 #include <media/v4l2-common.h>
 #include <media/v4l2-mediabus.h>
@@ -1148,9 +1149,9 @@ tvp514x_probe(struct i2c_client *client, const struct i2c_device_id *id)
 	/* Register with V4L2 layer as slave device */
 	sd = &decoder->sd;
 	v4l2_i2c_subdev_init(sd, client, &tvp514x_ops);
-	strlcpy(sd->name, TVP514X_MODULE_NAME, sizeof(sd->name));
 
 #if defined(CONFIG_MEDIA_CONTROLLER)
+	strlcpy(sd->name, TVP514X_MODULE_NAME, sizeof(sd->name));
 	decoder->pad.flags = MEDIA_PAD_FL_SOURCE;
 	decoder->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
 	decoder->sd.entity.flags |= MEDIA_ENT_T_V4L2_SUBDEV_DECODER;
@@ -1176,16 +1177,22 @@ tvp514x_probe(struct i2c_client *client, const struct i2c_device_id *id)
 	sd->ctrl_handler = &decoder->hdl;
 	if (decoder->hdl.error) {
 		ret = decoder->hdl.error;
-
-		v4l2_ctrl_handler_free(&decoder->hdl);
-		return ret;
+		goto done;
 	}
 	v4l2_ctrl_handler_setup(&decoder->hdl);
 
-	v4l2_info(sd, "%s decoder driver registered !!\n", sd->name);
-
-	return 0;
+	ret = v4l2_async_register_subdev(&decoder->sd);
+	if (!ret)
+		v4l2_info(sd, "%s decoder driver registered !!\n", sd->name);
 
+done:
+	if (ret < 0) {
+		v4l2_ctrl_handler_free(&decoder->hdl);
+#if defined(CONFIG_MEDIA_CONTROLLER)
+		media_entity_cleanup(&decoder->sd.entity);
+#endif
+	}
+	return ret;
 }
 
 /**
@@ -1200,6 +1207,7 @@ static int tvp514x_remove(struct i2c_client *client)
 	struct v4l2_subdev *sd = i2c_get_clientdata(client);
 	struct tvp514x_decoder *decoder = to_decoder(sd);
 
+	v4l2_async_unregister_subdev(&decoder->sd);
 	v4l2_device_unregister_subdev(sd);
 #if defined(CONFIG_MEDIA_CONTROLLER)
 	media_entity_cleanup(&decoder->sd.entity);
-- 
1.7.9.5

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