mirror of https://gitee.com/openkylin/linux.git
333 lines
8.0 KiB
C
333 lines
8.0 KiB
C
/*
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* V4L2 sub-device
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*
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* Copyright (C) 2010 Nokia Corporation
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*
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* Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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* Sakari Ailus <sakari.ailus@iki.fi>
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*
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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 version 2 as
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* published by the Free Software Foundation.
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*
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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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*
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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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#include <linux/ioctl.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/videodev2.h>
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#include <media/v4l2-ctrls.h>
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#include <media/v4l2-device.h>
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#include <media/v4l2-ioctl.h>
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#include <media/v4l2-fh.h>
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#include <media/v4l2-event.h>
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static int subdev_fh_init(struct v4l2_subdev_fh *fh, struct v4l2_subdev *sd)
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{
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#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
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/* Allocate try format and crop in the same memory block */
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fh->try_fmt = kzalloc((sizeof(*fh->try_fmt) + sizeof(*fh->try_crop))
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* sd->entity.num_pads, GFP_KERNEL);
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if (fh->try_fmt == NULL)
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return -ENOMEM;
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fh->try_crop = (struct v4l2_rect *)
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(fh->try_fmt + sd->entity.num_pads);
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#endif
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return 0;
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}
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static void subdev_fh_free(struct v4l2_subdev_fh *fh)
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{
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#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
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kfree(fh->try_fmt);
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fh->try_fmt = NULL;
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fh->try_crop = NULL;
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#endif
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}
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static int subdev_open(struct file *file)
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{
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struct video_device *vdev = video_devdata(file);
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struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
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struct v4l2_subdev_fh *subdev_fh;
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#if defined(CONFIG_MEDIA_CONTROLLER)
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struct media_entity *entity = NULL;
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#endif
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int ret;
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subdev_fh = kzalloc(sizeof(*subdev_fh), GFP_KERNEL);
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if (subdev_fh == NULL)
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return -ENOMEM;
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ret = subdev_fh_init(subdev_fh, sd);
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if (ret) {
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kfree(subdev_fh);
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return ret;
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}
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ret = v4l2_fh_init(&subdev_fh->vfh, vdev);
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if (ret)
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goto err;
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if (sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS) {
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ret = v4l2_event_init(&subdev_fh->vfh);
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if (ret)
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goto err;
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ret = v4l2_event_alloc(&subdev_fh->vfh, sd->nevents);
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if (ret)
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goto err;
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}
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v4l2_fh_add(&subdev_fh->vfh);
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file->private_data = &subdev_fh->vfh;
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#if defined(CONFIG_MEDIA_CONTROLLER)
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if (sd->v4l2_dev->mdev) {
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entity = media_entity_get(&sd->entity);
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if (!entity) {
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ret = -EBUSY;
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goto err;
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}
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}
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#endif
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if (sd->internal_ops && sd->internal_ops->open) {
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ret = sd->internal_ops->open(sd, subdev_fh);
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if (ret < 0)
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goto err;
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}
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return 0;
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err:
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#if defined(CONFIG_MEDIA_CONTROLLER)
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if (entity)
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media_entity_put(entity);
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#endif
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v4l2_fh_del(&subdev_fh->vfh);
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v4l2_fh_exit(&subdev_fh->vfh);
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subdev_fh_free(subdev_fh);
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kfree(subdev_fh);
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return ret;
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}
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static int subdev_close(struct file *file)
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{
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struct video_device *vdev = video_devdata(file);
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struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
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struct v4l2_fh *vfh = file->private_data;
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struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh);
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if (sd->internal_ops && sd->internal_ops->close)
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sd->internal_ops->close(sd, subdev_fh);
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#if defined(CONFIG_MEDIA_CONTROLLER)
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if (sd->v4l2_dev->mdev)
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media_entity_put(&sd->entity);
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#endif
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v4l2_fh_del(vfh);
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v4l2_fh_exit(vfh);
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subdev_fh_free(subdev_fh);
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kfree(subdev_fh);
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file->private_data = NULL;
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return 0;
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}
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static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg)
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{
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struct video_device *vdev = video_devdata(file);
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struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
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struct v4l2_fh *vfh = file->private_data;
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#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
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struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh);
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#endif
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switch (cmd) {
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case VIDIOC_QUERYCTRL:
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return v4l2_queryctrl(sd->ctrl_handler, arg);
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case VIDIOC_QUERYMENU:
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return v4l2_querymenu(sd->ctrl_handler, arg);
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case VIDIOC_G_CTRL:
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return v4l2_g_ctrl(sd->ctrl_handler, arg);
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case VIDIOC_S_CTRL:
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return v4l2_s_ctrl(sd->ctrl_handler, arg);
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case VIDIOC_G_EXT_CTRLS:
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return v4l2_g_ext_ctrls(sd->ctrl_handler, arg);
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case VIDIOC_S_EXT_CTRLS:
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return v4l2_s_ext_ctrls(sd->ctrl_handler, arg);
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case VIDIOC_TRY_EXT_CTRLS:
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return v4l2_try_ext_ctrls(sd->ctrl_handler, arg);
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case VIDIOC_DQEVENT:
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if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
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return -ENOIOCTLCMD;
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return v4l2_event_dequeue(vfh, arg, file->f_flags & O_NONBLOCK);
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case VIDIOC_SUBSCRIBE_EVENT:
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return v4l2_subdev_call(sd, core, subscribe_event, vfh, arg);
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case VIDIOC_UNSUBSCRIBE_EVENT:
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return v4l2_subdev_call(sd, core, unsubscribe_event, vfh, arg);
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#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API)
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case VIDIOC_SUBDEV_G_FMT: {
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struct v4l2_subdev_format *format = arg;
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if (format->which != V4L2_SUBDEV_FORMAT_TRY &&
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format->which != V4L2_SUBDEV_FORMAT_ACTIVE)
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return -EINVAL;
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if (format->pad >= sd->entity.num_pads)
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return -EINVAL;
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return v4l2_subdev_call(sd, pad, get_fmt, subdev_fh, format);
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}
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case VIDIOC_SUBDEV_S_FMT: {
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struct v4l2_subdev_format *format = arg;
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if (format->which != V4L2_SUBDEV_FORMAT_TRY &&
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format->which != V4L2_SUBDEV_FORMAT_ACTIVE)
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return -EINVAL;
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if (format->pad >= sd->entity.num_pads)
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return -EINVAL;
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return v4l2_subdev_call(sd, pad, set_fmt, subdev_fh, format);
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}
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case VIDIOC_SUBDEV_G_CROP: {
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struct v4l2_subdev_crop *crop = arg;
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if (crop->which != V4L2_SUBDEV_FORMAT_TRY &&
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crop->which != V4L2_SUBDEV_FORMAT_ACTIVE)
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return -EINVAL;
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if (crop->pad >= sd->entity.num_pads)
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return -EINVAL;
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return v4l2_subdev_call(sd, pad, get_crop, subdev_fh, crop);
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}
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case VIDIOC_SUBDEV_S_CROP: {
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struct v4l2_subdev_crop *crop = arg;
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if (crop->which != V4L2_SUBDEV_FORMAT_TRY &&
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crop->which != V4L2_SUBDEV_FORMAT_ACTIVE)
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return -EINVAL;
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if (crop->pad >= sd->entity.num_pads)
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return -EINVAL;
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return v4l2_subdev_call(sd, pad, set_crop, subdev_fh, crop);
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}
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case VIDIOC_SUBDEV_ENUM_MBUS_CODE: {
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struct v4l2_subdev_mbus_code_enum *code = arg;
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if (code->pad >= sd->entity.num_pads)
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return -EINVAL;
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return v4l2_subdev_call(sd, pad, enum_mbus_code, subdev_fh,
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code);
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}
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case VIDIOC_SUBDEV_ENUM_FRAME_SIZE: {
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struct v4l2_subdev_frame_size_enum *fse = arg;
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if (fse->pad >= sd->entity.num_pads)
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return -EINVAL;
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return v4l2_subdev_call(sd, pad, enum_frame_size, subdev_fh,
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fse);
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}
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case VIDIOC_SUBDEV_G_FRAME_INTERVAL:
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return v4l2_subdev_call(sd, video, g_frame_interval, arg);
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case VIDIOC_SUBDEV_S_FRAME_INTERVAL:
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return v4l2_subdev_call(sd, video, s_frame_interval, arg);
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case VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL: {
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struct v4l2_subdev_frame_interval_enum *fie = arg;
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if (fie->pad >= sd->entity.num_pads)
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return -EINVAL;
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return v4l2_subdev_call(sd, pad, enum_frame_interval, subdev_fh,
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fie);
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}
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#endif
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default:
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return v4l2_subdev_call(sd, core, ioctl, cmd, arg);
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}
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return 0;
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}
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static long subdev_ioctl(struct file *file, unsigned int cmd,
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unsigned long arg)
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{
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return video_usercopy(file, cmd, arg, subdev_do_ioctl);
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}
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static unsigned int subdev_poll(struct file *file, poll_table *wait)
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{
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struct video_device *vdev = video_devdata(file);
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struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev);
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struct v4l2_fh *fh = file->private_data;
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if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS))
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return POLLERR;
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poll_wait(file, &fh->events->wait, wait);
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if (v4l2_event_pending(fh))
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return POLLPRI;
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return 0;
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}
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const struct v4l2_file_operations v4l2_subdev_fops = {
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.owner = THIS_MODULE,
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.open = subdev_open,
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.unlocked_ioctl = subdev_ioctl,
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.release = subdev_close,
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.poll = subdev_poll,
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};
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void v4l2_subdev_init(struct v4l2_subdev *sd, const struct v4l2_subdev_ops *ops)
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{
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INIT_LIST_HEAD(&sd->list);
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BUG_ON(!ops);
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sd->ops = ops;
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sd->v4l2_dev = NULL;
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sd->flags = 0;
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sd->name[0] = '\0';
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sd->grp_id = 0;
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sd->dev_priv = NULL;
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sd->host_priv = NULL;
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#if defined(CONFIG_MEDIA_CONTROLLER)
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sd->entity.name = sd->name;
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sd->entity.type = MEDIA_ENT_T_V4L2_SUBDEV;
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#endif
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}
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EXPORT_SYMBOL(v4l2_subdev_init);
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