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V4L/DVB (9820): v4l2: add v4l2_device and v4l2_subdev structs to the v4l2 framework.
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
Mauro Carvalho Chehab
parent
07b1747c8d
commit
2a1fcdf082
6 changed files with 854 additions and 1 deletions
109
include/media/v4l2-device.h
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109
include/media/v4l2-device.h
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/*
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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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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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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 *dev, 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, dev) \
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list_for_each_entry(sd, &(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(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, &(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(dev, cond, o, f, args...) \
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({ \
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struct v4l2_subdev *sd; \
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int err = 0; \
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\
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list_for_each_entry(sd, &(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(dev, grp_id, o, f, args...) \
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__v4l2_device_call_subdevs(dev, \
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!(grp_id) || sd->grp_id == (grp_id), 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(dev, grp_id, o, f, args...) \
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__v4l2_device_call_subdevs_until_err(dev, \
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!(grp_id) || sd->grp_id == (grp_id), o, f , ##args)
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#endif
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188
include/media/v4l2-subdev.h
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188
include/media/v4l2-subdev.h
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/*
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V4L2 sub-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_SUBDEV_H
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#define _V4L2_SUBDEV_H
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#include <media/v4l2-common.h>
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struct v4l2_device;
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struct v4l2_subdev;
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struct tuner_setup;
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/* Sub-devices are devices that are connected somehow to the main bridge
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device. These devices are usually audio/video muxers/encoders/decoders or
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sensors and webcam controllers.
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Usually these devices are controlled through an i2c bus, but other busses
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may also be used.
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The v4l2_subdev struct provides a way of accessing these devices in a
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generic manner. Most operations that these sub-devices support fall in
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a few categories: core ops, audio ops, video ops and tuner ops.
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More categories can be added if needed, although this should remain a
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limited set (no more than approx. 8 categories).
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Each category has its own set of ops that subdev drivers can implement.
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A subdev driver can leave the pointer to the category ops NULL if
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it does not implement them (e.g. an audio subdev will generally not
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implement the video category ops). The exception is the core category:
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this must always be present.
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These ops are all used internally so it is no problem to change, remove
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or add ops or move ops from one to another category. Currently these
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ops are based on the original ioctls, but since ops are not limited to
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one argument there is room for improvement here once all i2c subdev
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drivers are converted to use these ops.
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*/
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/* Core ops: it is highly recommended to implement at least these ops:
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g_chip_ident
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log_status
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g_register
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s_register
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This provides basic debugging support.
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The ioctl ops is meant for generic ioctl-like commands. Depending on
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the use-case it might be better to use subdev-specific ops (currently
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not yet implemented) since ops provide proper type-checking.
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*/
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struct v4l2_subdev_core_ops {
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int (*g_chip_ident)(struct v4l2_subdev *sd, struct v4l2_chip_ident *chip);
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int (*log_status)(struct v4l2_subdev *sd);
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int (*init)(struct v4l2_subdev *sd, u32 val);
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int (*s_standby)(struct v4l2_subdev *sd, u32 standby);
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int (*reset)(struct v4l2_subdev *sd, u32 val);
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int (*s_gpio)(struct v4l2_subdev *sd, u32 val);
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int (*queryctrl)(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc);
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int (*g_ctrl)(struct v4l2_subdev *sd, struct v4l2_control *ctrl);
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int (*s_ctrl)(struct v4l2_subdev *sd, struct v4l2_control *ctrl);
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int (*querymenu)(struct v4l2_subdev *sd, struct v4l2_querymenu *qm);
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int (*ioctl)(struct v4l2_subdev *sd, int cmd, void *arg);
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#ifdef CONFIG_VIDEO_ADV_DEBUG
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int (*g_register)(struct v4l2_subdev *sd, struct v4l2_register *reg);
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int (*s_register)(struct v4l2_subdev *sd, struct v4l2_register *reg);
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#endif
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};
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struct v4l2_subdev_tuner_ops {
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int (*s_mode)(struct v4l2_subdev *sd, enum v4l2_tuner_type);
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int (*s_radio)(struct v4l2_subdev *sd);
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int (*s_frequency)(struct v4l2_subdev *sd, struct v4l2_frequency *freq);
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int (*g_frequency)(struct v4l2_subdev *sd, struct v4l2_frequency *freq);
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int (*g_tuner)(struct v4l2_subdev *sd, struct v4l2_tuner *vt);
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int (*s_tuner)(struct v4l2_subdev *sd, struct v4l2_tuner *vt);
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int (*s_std)(struct v4l2_subdev *sd, v4l2_std_id norm);
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int (*s_type_addr)(struct v4l2_subdev *sd, struct tuner_setup *type);
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int (*s_config)(struct v4l2_subdev *sd, const struct v4l2_priv_tun_config *config);
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};
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struct v4l2_subdev_audio_ops {
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int (*s_clock_freq)(struct v4l2_subdev *sd, u32 freq);
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int (*s_i2s_clock_freq)(struct v4l2_subdev *sd, u32 freq);
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int (*s_routing)(struct v4l2_subdev *sd, const struct v4l2_routing *route);
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};
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struct v4l2_subdev_video_ops {
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int (*s_routing)(struct v4l2_subdev *sd, const struct v4l2_routing *route);
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int (*s_crystal_freq)(struct v4l2_subdev *sd, struct v4l2_crystal_freq *freq);
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int (*decode_vbi_line)(struct v4l2_subdev *sd, struct v4l2_decode_vbi_line *vbi_line);
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int (*s_vbi_data)(struct v4l2_subdev *sd, const struct v4l2_sliced_vbi_data *vbi_data);
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int (*g_vbi_data)(struct v4l2_subdev *sd, struct v4l2_sliced_vbi_data *vbi_data);
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int (*s_std_output)(struct v4l2_subdev *sd, v4l2_std_id std);
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int (*s_stream)(struct v4l2_subdev *sd, int enable);
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int (*s_fmt)(struct v4l2_subdev *sd, struct v4l2_format *fmt);
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int (*g_fmt)(struct v4l2_subdev *sd, struct v4l2_format *fmt);
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};
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struct v4l2_subdev_ops {
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const struct v4l2_subdev_core_ops *core;
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const struct v4l2_subdev_tuner_ops *tuner;
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const struct v4l2_subdev_audio_ops *audio;
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const struct v4l2_subdev_video_ops *video;
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};
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#define V4L2_SUBDEV_NAME_SIZE 32
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/* Each instance of a subdev driver should create this struct, either
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stand-alone or embedded in a larger struct.
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*/
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struct v4l2_subdev {
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struct list_head list;
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struct module *owner;
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struct v4l2_device *dev;
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const struct v4l2_subdev_ops *ops;
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/* name must be unique */
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char name[V4L2_SUBDEV_NAME_SIZE];
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/* can be used to group similar subdevs, value is driver-specific */
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u32 grp_id;
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/* pointer to private data */
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void *priv;
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};
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static inline void v4l2_set_subdevdata(struct v4l2_subdev *sd, void *p)
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{
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sd->priv = p;
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}
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static inline void *v4l2_get_subdevdata(const struct v4l2_subdev *sd)
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{
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return sd->priv;
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}
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/* Convert an ioctl-type command to the proper v4l2_subdev_ops function call.
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This is used by subdev modules that can be called by both old-style ioctl
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commands and through the v4l2_subdev_ops.
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The ioctl API of the subdev driver can call this function to call the
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right ops based on the ioctl cmd and arg.
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Once all subdev drivers have been converted and all drivers no longer
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use the ioctl interface, then this function can be removed.
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*/
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int v4l2_subdev_command(struct v4l2_subdev *sd, unsigned cmd, void *arg);
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static inline void v4l2_subdev_init(struct v4l2_subdev *sd,
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const struct v4l2_subdev_ops *ops)
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{
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INIT_LIST_HEAD(&sd->list);
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/* ops->core MUST be set */
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BUG_ON(!ops || !ops->core);
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sd->ops = ops;
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sd->dev = NULL;
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sd->name[0] = '\0';
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sd->grp_id = 0;
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sd->priv = NULL;
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}
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/* Call an ops of a v4l2_subdev, doing the right checks against
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NULL pointers.
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Example: err = v4l2_subdev_call(sd, core, g_chip_ident, &chip);
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*/
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#define v4l2_subdev_call(sd, o, f, args...) \
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(!(sd) ? -ENODEV : (((sd) && (sd)->ops->o && (sd)->ops->o->f) ? \
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(sd)->ops->o->f((sd) , ##args) : -ENOIOCTLCMD))
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#endif
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