Em 07-07-2010 08:53, Laurent Pinchart escreveu:
> Create a device node named subdevX for every registered subdev.
> As the device node is registered before the subdev core::s_config
> function is called, return -EGAIN on open until initialization
> completes.
>
> Signed-off-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
> Signed-off-by: Vimarsh Zutshi <vimarsh.zutshi@xxxxxxxxx>
> ---
> drivers/media/video/Makefile | 2 +-
> drivers/media/video/v4l2-common.c | 3 ++
> drivers/media/video/v4l2-dev.c | 5 +++
> drivers/media/video/v4l2-device.c | 27 +++++++++++++++-
> drivers/media/video/v4l2-subdev.c | 65 +++++++++++++++++++++++++++++++++++++
> include/media/v4l2-dev.h | 3 +-
> include/media/v4l2-subdev.h | 10 ++++++
> 7 files changed, 112 insertions(+), 3 deletions(-)
> create mode 100644 drivers/media/video/v4l2-subdev.c
>
> diff --git a/drivers/media/video/Makefile b/drivers/media/video/Makefile
> index cc93859..c9c07e5 100644
> --- a/drivers/media/video/Makefile
> +++ b/drivers/media/video/Makefile
> @@ -11,7 +11,7 @@ stkwebcam-objs := stk-webcam.o stk-sensor.o
> omap2cam-objs := omap24xxcam.o omap24xxcam-dma.o
>
> videodev-objs := v4l2-dev.o v4l2-ioctl.o v4l2-device.o v4l2-fh.o \
> - v4l2-event.o
> + v4l2-event.o v4l2-subdev.o
>
> # V4L2 core modules
>
> diff --git a/drivers/media/video/v4l2-common.c b/drivers/media/video/v4l2-common.c
> index 4e53b0b..3032aa3 100644
> --- a/drivers/media/video/v4l2-common.c
> +++ b/drivers/media/video/v4l2-common.c
> @@ -871,6 +871,7 @@ struct v4l2_subdev *v4l2_i2c_new_subdev_board(struct v4l2_device *v4l2_dev,
>
> /* Register with the v4l2_device which increases the module's
> use count as well. */
> + sd->initialized = 0;
> if (v4l2_device_register_subdev(v4l2_dev, sd))
> sd = NULL;
> /* Decrease the module use count to match the first try_module_get. */
> @@ -885,6 +886,8 @@ struct v4l2_subdev *v4l2_i2c_new_subdev_board(struct v4l2_device *v4l2_dev,
> if (err && err != -ENOIOCTLCMD) {
> v4l2_device_unregister_subdev(sd);
> sd = NULL;
> + } else {
> + sd->initialized = 1;
> }
> }
>
> diff --git a/drivers/media/video/v4l2-dev.c b/drivers/media/video/v4l2-dev.c
> index 0ca7ec9..5a9e9df 100644
> --- a/drivers/media/video/v4l2-dev.c
> +++ b/drivers/media/video/v4l2-dev.c
> @@ -401,6 +401,8 @@ static int get_index(struct video_device *vdev)
> * %VFL_TYPE_VBI - Vertical blank data (undecoded)
> *
> * %VFL_TYPE_RADIO - A radio card
> + *
> + * %VFL_TYPE_SUBDEV - A subdevice
> */
> static int __video_register_device(struct video_device *vdev, int type, int nr,
> int warn_if_nr_in_use)
> @@ -439,6 +441,9 @@ static int __video_register_device(struct video_device *vdev, int type, int nr,
> case VFL_TYPE_RADIO:
> name_base = "radio";
> break;
> + case VFL_TYPE_SUBDEV:
> + name_base = "subdev";
> + break;
> default:
> printk(KERN_ERR "%s called with unknown type: %d\n",
> __func__, type);
> diff --git a/drivers/media/video/v4l2-device.c b/drivers/media/video/v4l2-device.c
> index 5a7dc4a..685fa82 100644
> --- a/drivers/media/video/v4l2-device.c
> +++ b/drivers/media/video/v4l2-device.c
> @@ -115,18 +115,40 @@ EXPORT_SYMBOL_GPL(v4l2_device_unregister);
> int v4l2_device_register_subdev(struct v4l2_device *v4l2_dev,
> struct v4l2_subdev *sd)
> {
> + struct video_device *vdev;
> + int ret;
> +
> /* Check for valid input */
> if (v4l2_dev == NULL || sd == NULL || !sd->name[0])
> return -EINVAL;
> +
> /* Warn if we apparently re-register a subdev */
> WARN_ON(sd->v4l2_dev != NULL);
> +
> if (!try_module_get(sd->owner))
> return -ENODEV;
> +
> sd->v4l2_dev = v4l2_dev;
> spin_lock(&v4l2_dev->lock);
> list_add_tail(&sd->list, &v4l2_dev->subdevs);
> spin_unlock(&v4l2_dev->lock);
> - return 0;
> +
> + /* Register the device node. */
> + vdev = &sd->devnode;
> + snprintf(vdev->name, sizeof(vdev->name), "subdev");
> + vdev->parent = v4l2_dev->dev;
> + vdev->fops = &v4l2_subdev_fops;
> + vdev->release = video_device_release_empty;
> + ret = video_register_device(vdev, VFL_TYPE_SUBDEV, -1);
> + if (ret < 0) {
> + spin_lock(&v4l2_dev->lock);
> + list_del(&sd->list);
> + spin_unlock(&v4l2_dev->lock);
> + sd->v4l2_dev = NULL;
> + module_put(sd->owner);
> + }
> +
> + return ret;
> }
> EXPORT_SYMBOL_GPL(v4l2_device_register_subdev);
>
> @@ -135,10 +157,13 @@ void v4l2_device_unregister_subdev(struct v4l2_subdev *sd)
> /* return if it isn't registered */
> if (sd == NULL || sd->v4l2_dev == NULL)
> return;
> +
> spin_lock(&sd->v4l2_dev->lock);
> list_del(&sd->list);
> spin_unlock(&sd->v4l2_dev->lock);
> sd->v4l2_dev = NULL;
> +
> module_put(sd->owner);
> + video_unregister_device(&sd->devnode);
> }
> EXPORT_SYMBOL_GPL(v4l2_device_unregister_subdev);
> diff --git a/drivers/media/video/v4l2-subdev.c b/drivers/media/video/v4l2-subdev.c
> new file mode 100644
> index 0000000..a048161
> --- /dev/null
> +++ b/drivers/media/video/v4l2-subdev.c
> @@ -0,0 +1,65 @@
> +/*
> + * V4L2 subdevice support.
> + *
> + * Copyright (C) 2009 Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
> + *
> + * 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/videodev2.h>
> +
> +#include <media/v4l2-device.h>
> +#include <media/v4l2-ioctl.h>
> +
> +static int subdev_open(struct file *file)
> +{
> + struct video_device *vdev = video_devdata(file);
> + struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
> +
> + if (!sd->initialized)
> + return -EAGAIN;
Those internal interfaces should not be used on normal devices/applications, as none of
the existing drivers are tested or supposed to properly work if an external program is
touching on its internal interfaces. So, please add:
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
> +
> + return 0;
> +}
> +
> +static int subdev_close(struct file *file)
> +{
> + return 0;
> +}
> +
> +static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg)
> +{
> + switch (cmd) {
> + default:
> + return -ENOIOCTLCMD;
> + }
> +
> + return 0;
> +}
> +
> +static long subdev_ioctl(struct file *file, unsigned int cmd,
> + unsigned long arg)
> +{
> + return video_usercopy(file, cmd, arg, subdev_do_ioctl);
This is a legacy call. Please, don't use it.
Also, while the API doc says that only certain ioctls are supported on subdev, there's
no code here preventing the usage of invalid ioctls. So, it is possible to do bad things,
like changing the video standard format individually on each subdev, creating all sorts of
problems.
> +}
> +
> +const struct v4l2_file_operations v4l2_subdev_fops = {
> + .owner = THIS_MODULE,
> + .open = subdev_open,
> + .unlocked_ioctl = subdev_ioctl,
> + .release = subdev_close,
> +};
> diff --git a/include/media/v4l2-dev.h b/include/media/v4l2-dev.h
> index bebe44b..eee1e2b 100644
> --- a/include/media/v4l2-dev.h
> +++ b/include/media/v4l2-dev.h
> @@ -22,7 +22,8 @@
> #define VFL_TYPE_VBI 1
> #define VFL_TYPE_RADIO 2
> #define VFL_TYPE_VTX 3
> -#define VFL_TYPE_MAX 4
> +#define VFL_TYPE_SUBDEV 4
> +#define VFL_TYPE_MAX 5
>
> struct v4l2_ioctl_callbacks;
> struct video_device;
> diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
> index 6088316..00010bd 100644
> --- a/include/media/v4l2-subdev.h
> +++ b/include/media/v4l2-subdev.h
> @@ -22,6 +22,7 @@
> #define _V4L2_SUBDEV_H
>
> #include <media/v4l2-common.h>
> +#include <media/v4l2-dev.h>
> #include <media/v4l2-mediabus.h>
>
> /* generic v4l2_device notify callback notification values */
> @@ -421,8 +422,16 @@ struct v4l2_subdev {
> u32 grp_id;
> /* pointer to private data */
> void *priv;
> + /* subdev device node */
> + struct video_device devnode;
> + unsigned int initialized;
> };
>
> +#define vdev_to_v4l2_subdev(vdev) \
> + container_of(vdev, struct v4l2_subdev, devnode)
> +
> +extern const struct v4l2_file_operations v4l2_subdev_fops;
> +
> static inline void v4l2_set_subdevdata(struct v4l2_subdev *sd, void *p)
> {
> sd->priv = p;
> @@ -444,6 +453,7 @@ static inline void v4l2_subdev_init(struct v4l2_subdev *sd,
> sd->name[0] = '\0';
> sd->grp_id = 0;
> sd->priv = NULL;
> + sd->initialized = 0;
> }
>
> /* Call an ops of a v4l2_subdev, doing the right checks against
--
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