linux-kernel - [PATCH 1/2] media: i2c: ths8200: support asynchronous probing

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Date:	Sat, 22 Jun 2013 15:16:34 +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>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <rob.herring@...xeda.com>,
	Rob Landley <rob@...dley.net>,
	devicetree-discuss@...ts.ozlabs.org, linux-doc@...r.kernel.org,
	"Lad, Prabhakar" <prabhakar.csengg@...il.com>
Subject: [PATCH 1/2] media: i2c: ths8200: support asynchronous probing

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

This patch supports both synchronous and asynchronous
ths8200 subdevice probing.

Signed-off-by: Lad, Prabhakar <prabhakar.csengg@...il.com>
---
 drivers/media/i2c/ths8200.c |    9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/media/i2c/ths8200.c b/drivers/media/i2c/ths8200.c
index a24f90c..cc1339a 100644
--- a/drivers/media/i2c/ths8200.c
+++ b/drivers/media/i2c/ths8200.c
@@ -21,6 +21,7 @@
 #include <linux/module.h>
 #include <linux/v4l2-dv-timings.h>
 
+#include <media/v4l2-async.h>
 #include <media/v4l2-device.h>
 
 #include "ths8200_regs.h"
@@ -500,6 +501,7 @@ static int ths8200_probe(struct i2c_client *client,
 {
 	struct ths8200_state *state;
 	struct v4l2_subdev *sd;
+	int error;
 
 	/* Check if the adapter supports the needed features */
 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
@@ -517,6 +519,10 @@ static int ths8200_probe(struct i2c_client *client,
 
 	ths8200_core_init(sd);
 
+	error = v4l2_async_register_subdev(&state->sd);
+	if (error)
+		return error;
+
 	v4l2_info(sd, "%s found @ 0x%x (%s)\n", client->name,
 		  client->addr << 1, client->adapter->name);
 
@@ -526,12 +532,13 @@ static int ths8200_probe(struct i2c_client *client,
 static int ths8200_remove(struct i2c_client *client)
 {
 	struct v4l2_subdev *sd = i2c_get_clientdata(client);
+	struct ths8200_state *decoder = to_state(sd);
 
 	v4l2_dbg(1, debug, sd, "%s removed @ 0x%x (%s)\n", client->name,
 		 client->addr << 1, client->adapter->name);
 
 	ths8200_s_power(sd, false);
-
+	v4l2_async_unregister_subdev(&decoder->sd);
 	v4l2_device_unregister_subdev(sd);
 
 	return 0;
-- 
1.7.9.5

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