linux-kernel - [RFC] [PATCH 5/6] media: em28xx-video - implement em28xx

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Date:	Fri, 21 Feb 2014 17:50:17 -0700
From:	Shuah Khan <shuah.kh@...sung.com>
To:	m.chehab@...sung.com
Cc:	Shuah Khan <shuah.kh@...sung.com>, linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org, shuahkhan@...il.com
Subject: [RFC] [PATCH 5/6] media: em28xx-video - implement em28xx_ops: suspend/resume hooks

Implement em28xx_ops: suspend/resume hooks. em28xx usb driver will
invoke em28xx_ops: suspend and resume hooks for all its extensions
from its suspend() and resume() interfaces.

Signed-off-by: Shuah Khan <shuah.kh@...sung.com>
---
 drivers/media/usb/em28xx/em28xx-video.c | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/drivers/media/usb/em28xx/em28xx-video.c b/drivers/media/usb/em28xx/em28xx-video.c
index c3c9289..1df6750 100644
--- a/drivers/media/usb/em28xx/em28xx-video.c
+++ b/drivers/media/usb/em28xx/em28xx-video.c
@@ -1933,6 +1933,32 @@ static int em28xx_v4l2_fini(struct em28xx *dev)
 	return 0;
 }
 
+static int em28xx_v4l2_suspend(struct em28xx *dev)
+{
+	if (dev->is_audio_only)
+		return 0;
+
+	if (!dev->has_video)
+		return 0;
+
+	em28xx_info("Suspending video extension");
+	em28xx_stop_urbs(dev);
+	return 0;
+}
+
+static int em28xx_v4l2_resume(struct em28xx *dev)
+{
+	if (dev->is_audio_only)
+		return 0;
+
+	if (!dev->has_video)
+		return 0;
+
+	em28xx_info("Resuming video extension");
+	/* what do we do here */
+	return 0;
+}
+
 /*
  * em28xx_v4l2_close()
  * stops streaming and deallocates all resources allocated by the v4l2
@@ -2504,6 +2530,8 @@ static struct em28xx_ops v4l2_ops = {
 	.name = "Em28xx v4l2 Extension",
 	.init = em28xx_v4l2_init,
 	.fini = em28xx_v4l2_fini,
+	.suspend = em28xx_v4l2_suspend,
+	.resume = em28xx_v4l2_resume,
 };
 
 static int __init em28xx_video_register(void)
-- 
1.8.3.2

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