mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-25 16:30:53 +07:00
2a1fcdf082
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>
110 lines
4.3 KiB
C
110 lines
4.3 KiB
C
/*
|
|
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
|