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 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

View File

@ -0,0 +1,362 @@
Overview of the V4L2 driver framework
=====================================
This text documents the various structures provided by the V4L2 framework and
their relationships.
Introduction
------------
The V4L2 drivers tend to be very complex due to the complexity of the
hardware: most devices have multiple ICs, export multiple device nodes in
/dev, and create also non-V4L2 devices such as DVB, ALSA, FB, I2C and input
(IR) devices.
Especially the fact that V4L2 drivers have to setup supporting ICs to
do audio/video muxing/encoding/decoding makes it more complex than most.
Usually these ICs are connected to the main bridge driver through one or
more I2C busses, but other busses can also be used. Such devices are
called 'sub-devices'.
For a long time the framework was limited to the video_device struct for
creating V4L device nodes and video_buf for handling the video buffers
(note that this document does not discuss the video_buf framework).
This meant that all drivers had to do the setup of device instances and
connecting to sub-devices themselves. Some of this is quite complicated
to do right and many drivers never did do it correctly.
There is also a lot of common code that could never be refactored due to
the lack of a framework.
So this framework sets up the basic building blocks that all drivers
need and this same framework should make it much easier to refactor
common code into utility functions shared by all drivers.
Structure of a driver
---------------------
All drivers have the following structure:
1) A struct for each device instance containing the device state.
2) A way of initializing and commanding sub-devices (if any).
3) Creating V4L2 device nodes (/dev/videoX, /dev/vbiX, /dev/radioX and
/dev/vtxX) and keeping track of device-node specific data.
4) Filehandle-specific structs containing per-filehandle data.
This is a rough schematic of how it all relates:
device instances
|
+-sub-device instances
|
\-V4L2 device nodes
|
\-filehandle instances
Structure of the framework
--------------------------
The framework closely resembles the driver structure: it has a v4l2_device
struct for the device instance data, a v4l2_subdev struct to refer to
sub-device instances, the video_device struct stores V4L2 device node data
and in the future a v4l2_fh struct will keep track of filehandle instances
(this is not yet implemented).
struct v4l2_device
------------------
Each device instance is represented by a struct v4l2_device (v4l2-device.h).
Very simple devices can just allocate this struct, but most of the time you
would embed this struct inside a larger struct.
You must register the device instance:
v4l2_device_register(struct device *dev, struct v4l2_device *v4l2_dev);
Registration will initialize the v4l2_device struct and link dev->driver_data
to v4l2_dev. Registration will also set v4l2_dev->name to a value derived from
dev (driver name followed by the bus_id, to be precise). You may change the
name after registration if you want.
You unregister with:
v4l2_device_unregister(struct v4l2_device *v4l2_dev);
Unregistering will also automatically unregister all subdevs from the device.
Sometimes you need to iterate over all devices registered by a specific
driver. This is usually the case if multiple device drivers use the same
hardware. E.g. the ivtvfb driver is a framebuffer driver that uses the ivtv
hardware. The same is true for alsa drivers for example.
You can iterate over all registered devices as follows:
static int callback(struct device *dev, void *p)
{
struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);
/* test if this device was inited */
if (v4l2_dev == NULL)
return 0;
...
return 0;
}
int iterate(void *p)
{
struct device_driver *drv;
int err;
/* Find driver 'ivtv' on the PCI bus.
pci_bus_type is a global. For USB busses use usb_bus_type. */
drv = driver_find("ivtv", &pci_bus_type);
/* iterate over all ivtv device instances */
err = driver_for_each_device(drv, NULL, p, callback);
put_driver(drv);
return err;
}
Sometimes you need to keep a running counter of the device instance. This is
commonly used to map a device instance to an index of a module option array.
The recommended approach is as follows:
static atomic_t drv_instance = ATOMIC_INIT(0);
static int __devinit drv_probe(struct pci_dev *dev,
const struct pci_device_id *pci_id)
{
...
state->instance = atomic_inc_return(&drv_instance) - 1;
}
struct v4l2_subdev
------------------
Many drivers need to communicate with sub-devices. These devices can do all
sort of tasks, but most commonly they handle audio and/or video muxing,
encoding or decoding. For webcams common sub-devices are sensors and camera
controllers.
Usually these are I2C devices, but not necessarily. In order to provide the
driver with a consistent interface to these sub-devices the v4l2_subdev struct
(v4l2-subdev.h) was created.
Each sub-device driver must have a v4l2_subdev struct. This struct can be
stand-alone for simple sub-devices or it might be embedded in a larger struct
if more state information needs to be stored. Usually there is a low-level
device struct (e.g. i2c_client) that contains the device data as setup
by the kernel. It is recommended to store that pointer in the private
data of v4l2_subdev using v4l2_set_subdevdata(). That makes it easy to go
from a v4l2_subdev to the actual low-level bus-specific device data.
You also need a way to go from the low-level struct to v4l2_subdev. For the
common i2c_client struct the i2c_set_clientdata() call is used to store a
v4l2_subdev pointer, for other busses you may have to use other methods.
From the bridge driver perspective you load the sub-device module and somehow
obtain the v4l2_subdev pointer. For i2c devices this is easy: you call
i2c_get_clientdata(). For other busses something similar needs to be done.
Helper functions exists for sub-devices on an I2C bus that do most of this
tricky work for you.
Each v4l2_subdev contains function pointers that sub-device drivers can
implement (or leave NULL if it is not applicable). Since sub-devices can do
so many different things and you do not want to end up with a huge ops struct
of which only a handful of ops are commonly implemented, the function pointers
are sorted according to category and each category has its own ops struct.
The top-level ops struct contains pointers to the category ops structs, which
may be NULL if the subdev driver does not support anything from that category.
It looks like this:
struct v4l2_subdev_core_ops {
int (*g_chip_ident)(struct v4l2_subdev *sd, struct v4l2_chip_ident *chip);
int (*log_status)(struct v4l2_subdev *sd);
int (*init)(struct v4l2_subdev *sd, u32 val);
...
};
struct v4l2_subdev_tuner_ops {
...
};
struct v4l2_subdev_audio_ops {
...
};
struct v4l2_subdev_video_ops {
...
};
struct v4l2_subdev_ops {
const struct v4l2_subdev_core_ops *core;
const struct v4l2_subdev_tuner_ops *tuner;
const struct v4l2_subdev_audio_ops *audio;
const struct v4l2_subdev_video_ops *video;
};
The core ops are common to all subdevs, the other categories are implemented
depending on the sub-device. E.g. a video device is unlikely to support the
audio ops and vice versa.
This setup limits the number of function pointers while still making it easy
to add new ops and categories.
A sub-device driver initializes the v4l2_subdev struct using:
v4l2_subdev_init(subdev, &ops);
Afterwards you need to initialize subdev->name with a unique name and set the
module owner. This is done for you if you use the i2c helper functions.
A device (bridge) driver needs to register the v4l2_subdev with the
v4l2_device:
int err = v4l2_device_register_subdev(device, subdev);
This can fail if the subdev module disappeared before it could be registered.
After this function was called successfully the subdev->dev field points to
the v4l2_device.
You can unregister a sub-device using:
v4l2_device_unregister_subdev(subdev);
Afterwards the subdev module can be unloaded and subdev->dev == NULL.
You can call an ops function either directly:
err = subdev->ops->core->g_chip_ident(subdev, &chip);
but it is better and easier to use this macro:
err = v4l2_subdev_call(subdev, core, g_chip_ident, &chip);
The macro will to the right NULL pointer checks and returns -ENODEV if subdev
is NULL, -ENOIOCTLCMD if either subdev->core or subdev->core->g_chip_ident is
NULL, or the actual result of the subdev->ops->core->g_chip_ident ops.
It is also possible to call all or a subset of the sub-devices:
v4l2_device_call_all(dev, 0, core, g_chip_ident, &chip);
Any subdev that does not support this ops is skipped and error results are
ignored. If you want to check for errors use this:
err = v4l2_device_call_until_err(dev, 0, core, g_chip_ident, &chip);
Any error except -ENOIOCTLCMD will exit the loop with that error. If no
errors (except -ENOIOCTLCMD) occured, then 0 is returned.
The second argument to both calls is a group ID. If 0, then all subdevs are
called. If non-zero, then only those whose group ID match that value will
be called. Before a bridge driver registers a subdev it can set subdev->grp_id
to whatever value it wants (it's 0 by default). This value is owned by the
bridge driver and the sub-device driver will never modify or use it.
The group ID gives the bridge driver more control how callbacks are called.
For example, there may be multiple audio chips on a board, each capable of
changing the volume. But usually only one will actually be used when the
user want to change the volume. You can set the group ID for that subdev to
e.g. AUDIO_CONTROLLER and specify that as the group ID value when calling
v4l2_device_call_all(). That ensures that it will only go to the subdev
that needs it.
The advantage of using v4l2_subdev is that it is a generic struct and does
not contain any knowledge about the underlying hardware. So a driver might
contain several subdevs that use an I2C bus, but also a subdev that is
controlled through GPIO pins. This distinction is only relevant when setting
up the device, but once the subdev is registered it is completely transparent.
I2C sub-device drivers
----------------------
Since these drivers are so common, special helper functions are available to
ease the use of these drivers (v4l2-common.h).
The recommended method of adding v4l2_subdev support to an I2C driver is to
embed the v4l2_subdev struct into the state struct that is created for each
I2C device instance. Very simple devices have no state struct and in that case
you can just create a v4l2_subdev directly.
A typical state struct would look like this (where 'chipname' is replaced by
the name of the chip):
struct chipname_state {
struct v4l2_subdev sd;
... /* additional state fields */
};
Initialize the v4l2_subdev struct as follows:
v4l2_i2c_subdev_init(&state->sd, client, subdev_ops);
This function will fill in all the fields of v4l2_subdev and ensure that the
v4l2_subdev and i2c_client both point to one another.
You should also add a helper inline function to go from a v4l2_subdev pointer
to a chipname_state struct:
static inline struct chipname_state *to_state(struct v4l2_subdev *sd)
{
return container_of(sd, struct chipname_state, sd);
}
Use this to go from the v4l2_subdev struct to the i2c_client struct:
struct i2c_client *client = v4l2_get_subdevdata(sd);
And this to go from an i2c_client to a v4l2_subdev struct:
struct v4l2_subdev *sd = i2c_get_clientdata(client);
Finally you need to make a command function to make driver->command()
call the right subdev_ops functions:
static int subdev_command(struct i2c_client *client, unsigned cmd, void *arg)
{
return v4l2_subdev_command(i2c_get_clientdata(client), cmd, arg);
}
If driver->command is never used then you can leave this out. Eventually the
driver->command usage should be removed from v4l.
Make sure to call v4l2_device_unregister_subdev(sd) when the remove() callback
is called. This will unregister the sub-device from the bridge driver. It is
safe to call this even if the sub-device was never registered.
The bridge driver also has some helper functions it can use:
struct v4l2_subdev *sd = v4l2_i2c_new_subdev(adapter, "module_foo", "chipid", 0x36);
This loads the given module (can be NULL if no module needs to be loaded) and
calls i2c_new_device() with the given i2c_adapter and chip/address arguments.
If all goes well, then it registers the subdev with the v4l2_device. It gets
the v4l2_device by calling i2c_get_adapdata(adapter), so you should make sure
that adapdata is set to v4l2_device when you setup the i2c_adapter in your
driver.
You can also use v4l2_i2c_new_probed_subdev() which is very similar to
v4l2_i2c_new_subdev(), except that it has an array of possible I2C addresses
that it should probe. Internally it calls i2c_new_probed_device().
Both functions return NULL if something went wrong.
struct video_device
-------------------
Not yet documented.

View File

@ -10,7 +10,7 @@ stkwebcam-objs := stk-webcam.o stk-sensor.o
omap2cam-objs := omap24xxcam.o omap24xxcam-dma.o
videodev-objs := v4l2-dev.o v4l2-ioctl.o
videodev-objs := v4l2-dev.o v4l2-ioctl.o v4l2-device.o v4l2-subdev.o
obj-$(CONFIG_VIDEO_DEV) += videodev.o v4l2-compat-ioctl32.o v4l2-int-device.o

View File

@ -0,0 +1,86 @@
/*
V4L2 device support.
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
*/
#include <linux/types.h>
#include <linux/ioctl.h>
#include <linux/i2c.h>
#include <linux/videodev2.h>
#include <media/v4l2-device.h>
int v4l2_device_register(struct device *dev, struct v4l2_device *v4l2_dev)
{
if (dev == NULL || v4l2_dev == NULL)
return -EINVAL;
/* Warn if we apparently re-register a device */
WARN_ON(dev_get_drvdata(dev));
INIT_LIST_HEAD(&v4l2_dev->subdevs);
spin_lock_init(&v4l2_dev->lock);
v4l2_dev->dev = dev;
snprintf(v4l2_dev->name, sizeof(v4l2_dev->name), "%s %s",
dev->driver->name, dev->bus_id);
dev_set_drvdata(dev, v4l2_dev);
return 0;
}
EXPORT_SYMBOL_GPL(v4l2_device_register);
void v4l2_device_unregister(struct v4l2_device *v4l2_dev)
{
struct v4l2_subdev *sd, *next;
if (v4l2_dev == NULL || v4l2_dev->dev == NULL)
return;
dev_set_drvdata(v4l2_dev->dev, NULL);
/* unregister subdevs */
list_for_each_entry_safe(sd, next, &v4l2_dev->subdevs, list)
v4l2_device_unregister_subdev(sd);
v4l2_dev->dev = NULL;
}
EXPORT_SYMBOL_GPL(v4l2_device_unregister);
int v4l2_device_register_subdev(struct v4l2_device *dev, struct v4l2_subdev *sd)
{
/* Check for valid input */
if (dev == NULL || sd == NULL || !sd->name[0])
return -EINVAL;
/* Warn if we apparently re-register a subdev */
WARN_ON(sd->dev);
if (!try_module_get(sd->owner))
return -ENODEV;
sd->dev = dev;
spin_lock(&dev->lock);
list_add_tail(&sd->list, &dev->subdevs);
spin_unlock(&dev->lock);
return 0;
}
EXPORT_SYMBOL_GPL(v4l2_device_register_subdev);
void v4l2_device_unregister_subdev(struct v4l2_subdev *sd)
{
/* return if it isn't registered */
if (sd == NULL || sd->dev == NULL)
return;
spin_lock(&sd->dev->lock);
list_del(&sd->list);
spin_unlock(&sd->dev->lock);
sd->dev = NULL;
module_put(sd->owner);
}
EXPORT_SYMBOL_GPL(v4l2_device_unregister_subdev);

View File

@ -0,0 +1,108 @@
/*
V4L2 sub-device support.
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
*/
#include <linux/types.h>
#include <linux/ioctl.h>
#include <linux/i2c.h>
#include <linux/videodev2.h>
#include <media/v4l2-subdev.h>
int v4l2_subdev_command(struct v4l2_subdev *sd, unsigned cmd, void *arg)
{
switch (cmd) {
case VIDIOC_QUERYCTRL:
return v4l2_subdev_call(sd, core, querymenu, arg);
case VIDIOC_G_CTRL:
return v4l2_subdev_call(sd, core, g_ctrl, arg);
case VIDIOC_S_CTRL:
return v4l2_subdev_call(sd, core, s_ctrl, arg);
case VIDIOC_QUERYMENU:
return v4l2_subdev_call(sd, core, queryctrl, arg);
case VIDIOC_LOG_STATUS:
return v4l2_subdev_call(sd, core, log_status);
case VIDIOC_G_CHIP_IDENT:
return v4l2_subdev_call(sd, core, g_chip_ident, arg);
case VIDIOC_INT_S_STANDBY:
return v4l2_subdev_call(sd, core, s_standby, *(u32 *)arg);
case VIDIOC_INT_RESET:
return v4l2_subdev_call(sd, core, reset, *(u32 *)arg);
case VIDIOC_INT_S_GPIO:
return v4l2_subdev_call(sd, core, s_gpio, *(u32 *)arg);
case VIDIOC_INT_INIT:
return v4l2_subdev_call(sd, core, init, *(u32 *)arg);
#ifdef CONFIG_VIDEO_ADV_DEBUG
case VIDIOC_DBG_G_REGISTER:
return v4l2_subdev_call(sd, core, g_register, arg);
case VIDIOC_DBG_S_REGISTER:
return v4l2_subdev_call(sd, core, s_register, arg);
#endif
case VIDIOC_INT_S_TUNER_MODE:
return v4l2_subdev_call(sd, tuner, s_mode, *(enum v4l2_tuner_type *)arg);
case AUDC_SET_RADIO:
return v4l2_subdev_call(sd, tuner, s_radio);
case VIDIOC_S_TUNER:
return v4l2_subdev_call(sd, tuner, s_tuner, arg);
case VIDIOC_G_TUNER:
return v4l2_subdev_call(sd, tuner, g_tuner, arg);
case VIDIOC_S_STD:
return v4l2_subdev_call(sd, tuner, s_std, *(v4l2_std_id *)arg);
case VIDIOC_S_FREQUENCY:
return v4l2_subdev_call(sd, tuner, s_frequency, arg);
case VIDIOC_G_FREQUENCY:
return v4l2_subdev_call(sd, tuner, g_frequency, arg);
case TUNER_SET_TYPE_ADDR:
return v4l2_subdev_call(sd, tuner, s_type_addr, arg);
case TUNER_SET_CONFIG:
return v4l2_subdev_call(sd, tuner, s_config, arg);
case VIDIOC_INT_AUDIO_CLOCK_FREQ:
return v4l2_subdev_call(sd, audio, s_clock_freq, *(u32 *)arg);
case VIDIOC_INT_S_AUDIO_ROUTING:
return v4l2_subdev_call(sd, audio, s_routing, arg);
case VIDIOC_INT_I2S_CLOCK_FREQ:
return v4l2_subdev_call(sd, audio, s_i2s_clock_freq, *(u32 *)arg);
case VIDIOC_INT_S_VIDEO_ROUTING:
return v4l2_subdev_call(sd, video, s_routing, arg);
case VIDIOC_INT_S_CRYSTAL_FREQ:
return v4l2_subdev_call(sd, video, s_crystal_freq, arg);
case VIDIOC_INT_DECODE_VBI_LINE:
return v4l2_subdev_call(sd, video, decode_vbi_line, arg);
case VIDIOC_INT_S_VBI_DATA:
return v4l2_subdev_call(sd, video, s_vbi_data, arg);
case VIDIOC_INT_G_VBI_DATA:
return v4l2_subdev_call(sd, video, g_vbi_data, arg);
case VIDIOC_S_FMT:
return v4l2_subdev_call(sd, video, s_fmt, arg);
case VIDIOC_G_FMT:
return v4l2_subdev_call(sd, video, g_fmt, arg);
case VIDIOC_INT_S_STD_OUTPUT:
return v4l2_subdev_call(sd, video, s_std_output, *(v4l2_std_id *)arg);
case VIDIOC_STREAMON:
return v4l2_subdev_call(sd, video, s_stream, 1);
case VIDIOC_STREAMOFF:
return v4l2_subdev_call(sd, video, s_stream, 0);
default:
return v4l2_subdev_call(sd, core, ioctl, cmd, arg);
}
}
EXPORT_SYMBOL_GPL(v4l2_subdev_command);

109
include/media/v4l2-device.h Normal file
View File

@ -0,0 +1,109 @@
/*
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

188
include/media/v4l2-subdev.h Normal file
View File

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