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/* V4L2 device support header. Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl> This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. 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 */struct v4l2_ctrl_handler;/** * struct v4l2_device - main struct to for V4L2 device drivers * * @dev: pointer to struct device. * @mdev: pointer to struct media_device, may be NULL. * @subdevs: used to keep track of the registered subdevs * @lock: lock this struct; can be used by the driver as well * if this struct is embedded into a larger struct. * @name: unique device name, by default the driver name + bus ID * @notify: notify operation called by some sub-devices. * @ctrl_handler: The control handler. May be %NULL. * @prio: Device's priority state * @ref: Keep track of the references to this struct. * @release: Release function that is called when the ref count * goes to 0. * * Each instance of a V4L2 device should create the v4l2_device struct, * either stand-alone or embedded in a larger struct. * * It allows easy access to sub-devices (see v4l2-subdev.h) and provides * basic V4L2 device-level support. * * .. note:: * * #) @dev->driver_data points to this struct. * #) @dev might be %NULL if there is no parent device */struct v4l2_device { struct device *dev; struct media_device *mdev; struct list_head subdevs; spinlock_t lock; char name[V4L2_DEVICE_NAME_SIZE]; void (*notify)(struct v4l2_subdev *sd, unsigned int notification, void *arg); struct v4l2_ctrl_handler *ctrl_handler; struct v4l2_prio_state prio; struct kref ref; void (*release)(struct v4l2_device *v4l2_dev);};/** * v4l2_device_get - gets a V4L2 device reference * * @v4l2_dev: pointer to struct &v4l2_device * * This is an ancillary routine meant to increment the usage for the * struct &v4l2_device pointed by @v4l2_dev. */static inline void v4l2_device_get(struct v4l2_device *v4l2_dev){ kref_get(&v4l2_dev->ref);}/** * v4l2_device_put - putss a V4L2 device reference * * @v4l2_dev: pointer to struct &v4l2_device * * This is an ancillary routine meant to decrement the usage for the * struct &v4l2_device pointed by @v4l2_dev.