V4L/DVB: V4L: File handles (1babcb46) · Commits · e / devices / android_kernel_fairphone_FP5

drivers/media/video/Makefile

+1 −1

Original line number	Diff line number	Diff line
		@@ -10,7 +10,7 @@ stkwebcam-objs := stk-webcam.o stk-sensor.o

		omap2cam-objs := omap24xxcam.o omap24xxcam-dma.o

		videodev-objs := v4l2-dev.o v4l2-ioctl.o v4l2-device.o
		videodev-objs := v4l2-dev.o v4l2-ioctl.o v4l2-device.o v4l2-fh.o

		# V4L2 core modules

drivers/media/video/v4l2-dev.c

+4 −0

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		@@ -421,6 +421,10 @@ static int __video_register_device(struct video_device *vdev, int type, int nr,
		if (!vdev->release)
		return -EINVAL;

		/* v4l2_fh support */
		spin_lock_init(&vdev->fh_lock);
		INIT_LIST_HEAD(&vdev->fh_list);

		/* Part 1: check device type */
		switch (type) {
		case VFL_TYPE_GRABBER:

drivers/media/video/v4l2-fh.c

0 → 100644

+66 −0

Original line number	Diff line number	Diff line
		/*
		* v4l2-fh.c
		*
		* V4L2 file handles.
		*
		* Copyright (C) 2009--2010 Nokia Corporation.
		*
		* Contact: Sakari Ailus <sakari.ailus@maxwell.research.nokia.com>
		*
		* This program is free software; you can redistribute it and/or
		* modify it under the terms of the GNU General Public License
		* version 2 as published by the Free Software Foundation.
		*
		* This program is distributed in the hope that it will be useful, but
		* WITHOUT ANY WARRANTY; without even the implied warranty of
		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
		* General Public License for more details.
		*
		* You should have received a copy of the GNU General Public License
		* along with this program; if not, write to the Free Software
		* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
		* 02110-1301 USA
		*/

		#include <linux/bitops.h>
		#include <media/v4l2-dev.h>
		#include <media/v4l2-fh.h>

		int v4l2_fh_init(struct v4l2_fh fh, struct video_device vdev)
		{
		fh->vdev = vdev;
		INIT_LIST_HEAD(&fh->list);
		set_bit(V4L2_FL_USES_V4L2_FH, &fh->vdev->flags);

		return 0;
		}
		EXPORT_SYMBOL_GPL(v4l2_fh_init);

		void v4l2_fh_add(struct v4l2_fh *fh)
		{
		unsigned long flags;

		spin_lock_irqsave(&fh->vdev->fh_lock, flags);
		list_add(&fh->list, &fh->vdev->fh_list);
		spin_unlock_irqrestore(&fh->vdev->fh_lock, flags);
		}
		EXPORT_SYMBOL_GPL(v4l2_fh_add);

		void v4l2_fh_del(struct v4l2_fh *fh)
		{
		unsigned long flags;

		spin_lock_irqsave(&fh->vdev->fh_lock, flags);
		list_del_init(&fh->list);
		spin_unlock_irqrestore(&fh->vdev->fh_lock, flags);
		}
		EXPORT_SYMBOL_GPL(v4l2_fh_del);

		void v4l2_fh_exit(struct v4l2_fh *fh)
		{
		if (fh->vdev == NULL)
		return;

		fh->vdev = NULL;
		}
		EXPORT_SYMBOL_GPL(v4l2_fh_exit);

include/media/v4l2-dev.h

+5 −0

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		@@ -32,6 +32,7 @@ struct v4l2_device;
		Drivers can clear this flag if they want to block all future
		device access. It is cleared by video_unregister_device. */
		#define V4L2_FL_REGISTERED (0)
		#define V4L2_FL_USES_V4L2_FH (1)

		struct v4l2_file_operations {
		struct module *owner;
		@@ -77,6 +78,10 @@ struct video_device
		/* attribute to differentiate multiple indices on one physical device */
		int index;

		/* V4L2 file handles */
		spinlock_t fh_lock; /* Lock for all v4l2_fhs */
		struct list_head fh_list; /* List of struct v4l2_fh */

		int debug; /* Activates debug level*/

		/* Video standard vars */

include/media/v4l2-fh.h

0 → 100644

+63 −0

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		/*
		* v4l2-fh.h
		*
		* V4L2 file handle. Store per file handle data for the V4L2
		* framework. Using file handles is optional for the drivers.
		*
		* Copyright (C) 2009--2010 Nokia Corporation.
		*
		* Contact: Sakari Ailus <sakari.ailus@maxwell.research.nokia.com>
		*
		* This program is free software; you can redistribute it and/or
		* modify it under the terms of the GNU General Public License
		* version 2 as published by the Free Software Foundation.
		*
		* This program is distributed in the hope that it will be useful, but
		* WITHOUT ANY WARRANTY; without even the implied warranty of
		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
		* General Public License for more details.
		*
		* You should have received a copy of the GNU General Public License
		* along with this program; if not, write to the Free Software
		* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
		* 02110-1301 USA
		*/

		#ifndef V4L2_FH_H
		#define V4L2_FH_H

		#include <linux/list.h>

		struct video_device;

		struct v4l2_fh {
		struct list_head list;
		struct video_device *vdev;
		};

		/*
		* Initialise the file handle. Parts of the V4L2 framework using the
		* file handles should be initialised in this function. Must be called
		* from driver's v4l2_file_operations->open() handler if the driver
		* uses v4l2_fh.
		*/
		int v4l2_fh_init(struct v4l2_fh fh, struct video_device vdev);
		/*
		* Add the fh to the list of file handles on a video_device. The file
		* handle must be initialised first.
		*/
		void v4l2_fh_add(struct v4l2_fh *fh);
		/*
		* Remove file handle from the list of file handles. Must be called in
		* v4l2_file_operations->release() handler if the driver uses v4l2_fh.
		*/
		void v4l2_fh_del(struct v4l2_fh *fh);
		/*
		* Release resources related to a file handle. Parts of the V4L2
		* framework using the v4l2_fh must release their resources here, too.
		* Must be called in v4l2_file_operations->release() handler if the
		* driver uses v4l2_fh.
		*/
		void v4l2_fh_exit(struct v4l2_fh *fh);

		#endif /* V4L2_EVENT_H */