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V4L/DVB (9820): v4l2: add v4l2_device and v4l2_subdev structs to the v4l2 framework.

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Start implementing a proper v4l2 framework as discussed during the
Linux Plumbers Conference 2008.

Introduces v4l2_device (for device instances) and v4l2_subdev (representing
sub-device instances).

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Reviewed-by: Laurent Pinchart <laurent.pinchart@skynet.be>
Reviewed-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Reviewed-by: Andy Walls <awalls@radix.net>
Reviewed-by: David Brownell <david-b@pacbell.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Hans Verkuil 2008-11-29 21:36:58 -03:00 • committed by Mauro Carvalho Chehab
parent 07b1747c8d
commit 2a1fcdf082
6 changed files with 854 additions and 1 deletions
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109
include/media/v4l2-device.h Normal file
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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
*/
#ifndef _V4L2_DEVICE_H
#define _V4L2_DEVICE_H
#include <media/v4l2-subdev.h>
/* 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.
*/
#define V4L2_DEVICE_NAME_SIZE (BUS_ID_SIZE + 16)
struct v4l2_device {
/* dev->driver_data points to this struct */
struct device *dev;
/* used to keep track of the registered subdevs */
struct list_head subdevs;
/* lock this struct; can be used by the driver as well if this
struct is embedded into a larger struct. */
spinlock_t lock;
/* unique device name, by default the driver name + bus ID */
char name[V4L2_DEVICE_NAME_SIZE];
};
/* Initialize v4l2_dev and make dev->driver_data point to v4l2_dev */
int __must_check v4l2_device_register(struct device *dev, struct v4l2_device *v4l2_dev);
/* Set v4l2_dev->dev->driver_data to NULL and unregister all sub-devices */
void v4l2_device_unregister(struct v4l2_device *v4l2_dev);
/* Register a subdev with a v4l2 device. While registered the subdev module
is marked as in-use. An error is returned if the module is no longer
loaded when you attempt to register it. */
int __must_check v4l2_device_register_subdev(struct v4l2_device *dev, struct v4l2_subdev *sd);
/* Unregister a subdev with a v4l2 device. Can also be called if the subdev
wasn't registered. In that case it will do nothing. */
void v4l2_device_unregister_subdev(struct v4l2_subdev *sd);
/* Iterate over all subdevs. */
#define v4l2_device_for_each_subdev(sd, dev) \
list_for_each_entry(sd, &(dev)->subdevs, list)
/* Call the specified callback for all subdevs matching the condition.
Ignore any errors. Note that you cannot add or delete a subdev
while walking the subdevs list. */
#define __v4l2_device_call_subdevs(dev, cond, o, f, args...) \
do { \
struct v4l2_subdev *sd; \
\
list_for_each_entry(sd, &(dev)->subdevs, list) \
if ((cond) && sd->ops->o && sd->ops->o->f) \
sd->ops->o->f(sd , ##args); \
} while (0)
/* Call the specified callback for all subdevs matching the condition.
If the callback returns an error other than 0 or -ENOIOCTLCMD, then
return with that error code. Note that you cannot add or delete a
subdev while walking the subdevs list. */
#define __v4l2_device_call_subdevs_until_err(dev, cond, o, f, args...) \
({ \
struct v4l2_subdev *sd; \
int err = 0; \
\
list_for_each_entry(sd, &(dev)->subdevs, list) { \
if ((cond) && sd->ops->o && sd->ops->o->f) \
err = sd->ops->o->f(sd , ##args); \
if (err && err != -ENOIOCTLCMD) \
break; \
} \
(err == -ENOIOCTLCMD) ? 0 : err; \
})
/* Call the specified callback for all subdevs matching grp_id (if 0, then
match them all). Ignore any errors. Note that you cannot add or delete
a subdev while walking the subdevs list. */
#define v4l2_device_call_all(dev, grp_id, o, f, args...) \
__v4l2_device_call_subdevs(dev, \
!(grp_id) || sd->grp_id == (grp_id), o, f , ##args)
/* Call the specified callback for all subdevs matching grp_id (if 0, then
match them all). If the callback returns an error other than 0 or
-ENOIOCTLCMD, then return with that error code. Note that you cannot
add or delete a subdev while walking the subdevs list. */
#define v4l2_device_call_until_err(dev, grp_id, o, f, args...) \
__v4l2_device_call_subdevs_until_err(dev, \
!(grp_id) || sd->grp_id == (grp_id), o, f , ##args)
#endif