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author | Sakari Ailus <sakari.ailus@maxwell.research.nokia.com> | 2010-03-23 09:25:26 -0300 |
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committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2010-05-19 12:58:04 -0300 |
commit | 1babcb460f2b87c20eb6860b9685a0dab636cc4b (patch) | |
tree | aaffa67ec3b3fc958ea2d7eea50e1b67242f2645 /drivers | |
parent | 96d8eab5d0a1a9741a4cae1b3c125d75d1aabedf (diff) | |
download | kernel_samsung_smdk4412-1babcb460f2b87c20eb6860b9685a0dab636cc4b.zip kernel_samsung_smdk4412-1babcb460f2b87c20eb6860b9685a0dab636cc4b.tar.gz kernel_samsung_smdk4412-1babcb460f2b87c20eb6860b9685a0dab636cc4b.tar.bz2 |
V4L/DVB: V4L: File handles
This patch adds a list of v4l2_fh structures to every video_device.
It allows using file handle related information in V4L2. The event interface
is one example of such use.
The use of v4l2_fh is not mandatory for drivers.
Signed-off-by: Sakari Ailus <sakari.ailus@maxwell.research.nokia.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/media/video/Makefile | 2 | ||||
-rw-r--r-- | drivers/media/video/v4l2-dev.c | 4 | ||||
-rw-r--r-- | drivers/media/video/v4l2-fh.c | 66 |
3 files changed, 71 insertions, 1 deletions
diff --git a/drivers/media/video/Makefile b/drivers/media/video/Makefile index a688a0f4..c84175c 100644 --- a/drivers/media/video/Makefile +++ b/drivers/media/video/Makefile @@ -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 diff --git a/drivers/media/video/v4l2-dev.c b/drivers/media/video/v4l2-dev.c index 7090699..65a7b30 100644 --- a/drivers/media/video/v4l2-dev.c +++ b/drivers/media/video/v4l2-dev.c @@ -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: diff --git a/drivers/media/video/v4l2-fh.c b/drivers/media/video/v4l2-fh.c new file mode 100644 index 0000000..93ea0af --- /dev/null +++ b/drivers/media/video/v4l2-fh.c @@ -0,0 +1,66 @@ +/* + * 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); |