diff options
author | Laurent Pinchart <laurent.pinchart@ideasonboard.com> | 2009-12-09 11:39:58 (GMT) |
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committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2011-03-22 07:53:09 (GMT) |
commit | 176fb0d108f7495ccf9aa127e1342a1a0d87e004 (patch) | |
tree | a1b54ad186dde663853d4d2d24f42cd7c0f94bfb /drivers/media/media-device.c | |
parent | cf4b9211b5680cd9ca004232e517fb7ec5bf5316 (diff) | |
download | linux-176fb0d108f7495ccf9aa127e1342a1a0d87e004.tar.xz |
[media] media: Media device
The media_device structure abstracts functions common to all kind of
media devices (v4l2, dvb, alsa, ...). It manages media entities and
offers a userspace API to discover and configure the media device
internal topology.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/media-device.c')
-rw-r--r-- | drivers/media/media-device.c | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/drivers/media/media-device.c b/drivers/media/media-device.c new file mode 100644 index 0000000..bcd3985 --- /dev/null +++ b/drivers/media/media-device.c @@ -0,0 +1,100 @@ +/* + * Media device + * + * Copyright (C) 2010 Nokia Corporation + * + * Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com> + * Sakari Ailus <sakari.ailus@iki.fi> + * + * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <linux/types.h> +#include <linux/ioctl.h> + +#include <media/media-device.h> +#include <media/media-devnode.h> + +static const struct media_file_operations media_device_fops = { + .owner = THIS_MODULE, +}; + +/* ----------------------------------------------------------------------------- + * sysfs + */ + +static ssize_t show_model(struct device *cd, + struct device_attribute *attr, char *buf) +{ + struct media_device *mdev = to_media_device(to_media_devnode(cd)); + + return sprintf(buf, "%.*s\n", (int)sizeof(mdev->model), mdev->model); +} + +static DEVICE_ATTR(model, S_IRUGO, show_model, NULL); + +/* ----------------------------------------------------------------------------- + * Registration/unregistration + */ + +static void media_device_release(struct media_devnode *mdev) +{ +} + +/** + * media_device_register - register a media device + * @mdev: The media device + * + * The caller is responsible for initializing the media device before + * registration. The following fields must be set: + * + * - dev must point to the parent device + * - model must be filled with the device model name + */ +int __must_check media_device_register(struct media_device *mdev) +{ + int ret; + + if (WARN_ON(mdev->dev == NULL || mdev->model[0] == 0)) + return -EINVAL; + + /* Register the device node. */ + mdev->devnode.fops = &media_device_fops; + mdev->devnode.parent = mdev->dev; + mdev->devnode.release = media_device_release; + ret = media_devnode_register(&mdev->devnode); + if (ret < 0) + return ret; + + ret = device_create_file(&mdev->devnode.dev, &dev_attr_model); + if (ret < 0) { + media_devnode_unregister(&mdev->devnode); + return ret; + } + + return 0; +} +EXPORT_SYMBOL_GPL(media_device_register); + +/** + * media_device_unregister - unregister a media device + * @mdev: The media device + * + */ +void media_device_unregister(struct media_device *mdev) +{ + device_remove_file(&mdev->devnode.dev, &dev_attr_model); + media_devnode_unregister(&mdev->devnode); +} +EXPORT_SYMBOL_GPL(media_device_unregister); |