3a63e4492f
Some drivers (e.g. for ISA devices) have no parent device because there is no associated bus driver. Allow the parent device to be NULL in those cases when registering v4l2_device. Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
115 lines
4.6 KiB
C
115 lines
4.6 KiB
C
/*
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V4L2 device support header.
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Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _V4L2_DEVICE_H
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#define _V4L2_DEVICE_H
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#include <media/v4l2-subdev.h>
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/* Each instance of a V4L2 device should create the v4l2_device struct,
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either stand-alone or embedded in a larger struct.
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It allows easy access to sub-devices (see v4l2-subdev.h) and provides
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basic V4L2 device-level support.
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*/
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#define V4L2_DEVICE_NAME_SIZE (BUS_ID_SIZE + 16)
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struct v4l2_device {
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/* dev->driver_data points to this struct.
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Note: dev might be NULL if there is no parent device
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as is the case with e.g. ISA devices. */
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struct device *dev;
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/* used to keep track of the registered subdevs */
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struct list_head subdevs;
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/* lock this struct; can be used by the driver as well if this
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struct is embedded into a larger struct. */
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spinlock_t lock;
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/* unique device name, by default the driver name + bus ID */
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char name[V4L2_DEVICE_NAME_SIZE];
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};
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/* Initialize v4l2_dev and make dev->driver_data point to v4l2_dev.
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dev may be NULL in rare cases (ISA devices). In that case you
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must fill in the v4l2_dev->name field before calling this function. */
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int __must_check v4l2_device_register(struct device *dev, struct v4l2_device *v4l2_dev);
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/* Set v4l2_dev->dev->driver_data to NULL and unregister all sub-devices */
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void v4l2_device_unregister(struct v4l2_device *v4l2_dev);
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/* Register a subdev with a v4l2 device. While registered the subdev module
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is marked as in-use. An error is returned if the module is no longer
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loaded when you attempt to register it. */
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int __must_check v4l2_device_register_subdev(struct v4l2_device *v4l2_dev,
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struct v4l2_subdev *sd);
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/* Unregister a subdev with a v4l2 device. Can also be called if the subdev
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wasn't registered. In that case it will do nothing. */
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void v4l2_device_unregister_subdev(struct v4l2_subdev *sd);
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/* Iterate over all subdevs. */
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#define v4l2_device_for_each_subdev(sd, v4l2_dev) \
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list_for_each_entry(sd, &(v4l2_dev)->subdevs, list)
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/* Call the specified callback for all subdevs matching the condition.
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Ignore any errors. Note that you cannot add or delete a subdev
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while walking the subdevs list. */
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#define __v4l2_device_call_subdevs(v4l2_dev, cond, o, f, args...) \
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do { \
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struct v4l2_subdev *sd; \
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\
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list_for_each_entry(sd, &(v4l2_dev)->subdevs, list) \
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if ((cond) && sd->ops->o && sd->ops->o->f) \
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sd->ops->o->f(sd , ##args); \
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} while (0)
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/* Call the specified callback for all subdevs matching the condition.
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If the callback returns an error other than 0 or -ENOIOCTLCMD, then
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return with that error code. Note that you cannot add or delete a
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subdev while walking the subdevs list. */
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#define __v4l2_device_call_subdevs_until_err(v4l2_dev, cond, o, f, args...) \
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({ \
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struct v4l2_subdev *sd; \
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long err = 0; \
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\
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list_for_each_entry(sd, &(v4l2_dev)->subdevs, list) { \
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if ((cond) && sd->ops->o && sd->ops->o->f) \
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err = sd->ops->o->f(sd , ##args); \
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if (err && err != -ENOIOCTLCMD) \
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break; \
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} \
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(err == -ENOIOCTLCMD) ? 0 : err; \
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})
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/* Call the specified callback for all subdevs matching grp_id (if 0, then
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match them all). Ignore any errors. Note that you cannot add or delete
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a subdev while walking the subdevs list. */
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#define v4l2_device_call_all(v4l2_dev, grpid, o, f, args...) \
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__v4l2_device_call_subdevs(v4l2_dev, \
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!(grpid) || sd->grp_id == (grpid), o, f , ##args)
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/* Call the specified callback for all subdevs matching grp_id (if 0, then
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match them all). If the callback returns an error other than 0 or
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-ENOIOCTLCMD, then return with that error code. Note that you cannot
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add or delete a subdev while walking the subdevs list. */
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#define v4l2_device_call_until_err(v4l2_dev, grpid, o, f, args...) \
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__v4l2_device_call_subdevs_until_err(v4l2_dev, \
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!(grpid) || sd->grp_id == (grpid), o, f , ##args)
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#endif
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