diff options
Diffstat (limited to 'drivers/media/video/v4l2-subdev.c')
| -rw-r--r-- | drivers/media/video/v4l2-subdev.c | 332 |
1 files changed, 332 insertions, 0 deletions
diff --git a/drivers/media/video/v4l2-subdev.c b/drivers/media/video/v4l2-subdev.c new file mode 100644 index 000000000000..0b8064490676 --- /dev/null +++ b/drivers/media/video/v4l2-subdev.c @@ -0,0 +1,332 @@ +/* + * V4L2 sub-device + * + * Copyright (C) 2010 Nokia Corporation + * + * Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com> + * Sakari Ailus <sakari.ailus@iki.fi> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * 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/ioctl.h> +#include <linux/slab.h> +#include <linux/types.h> +#include <linux/videodev2.h> + +#include <media/v4l2-ctrls.h> +#include <media/v4l2-device.h> +#include <media/v4l2-ioctl.h> +#include <media/v4l2-fh.h> +#include <media/v4l2-event.h> + +static int subdev_fh_init(struct v4l2_subdev_fh *fh, struct v4l2_subdev *sd) +{ +#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API) + /* Allocate try format and crop in the same memory block */ + fh->try_fmt = kzalloc((sizeof(*fh->try_fmt) + sizeof(*fh->try_crop)) + * sd->entity.num_pads, GFP_KERNEL); + if (fh->try_fmt == NULL) + return -ENOMEM; + + fh->try_crop = (struct v4l2_rect *) + (fh->try_fmt + sd->entity.num_pads); +#endif + return 0; +} + +static void subdev_fh_free(struct v4l2_subdev_fh *fh) +{ +#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API) + kfree(fh->try_fmt); + fh->try_fmt = NULL; + fh->try_crop = NULL; +#endif +} + +static int subdev_open(struct file *file) +{ + struct video_device *vdev = video_devdata(file); + struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev); + struct v4l2_subdev_fh *subdev_fh; +#if defined(CONFIG_MEDIA_CONTROLLER) + struct media_entity *entity = NULL; +#endif + int ret; + + subdev_fh = kzalloc(sizeof(*subdev_fh), GFP_KERNEL); + if (subdev_fh == NULL) + return -ENOMEM; + + ret = subdev_fh_init(subdev_fh, sd); + if (ret) { + kfree(subdev_fh); + return ret; + } + + ret = v4l2_fh_init(&subdev_fh->vfh, vdev); + if (ret) + goto err; + + if (sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS) { + ret = v4l2_event_init(&subdev_fh->vfh); + if (ret) + goto err; + + ret = v4l2_event_alloc(&subdev_fh->vfh, sd->nevents); + if (ret) + goto err; + } + + v4l2_fh_add(&subdev_fh->vfh); + file->private_data = &subdev_fh->vfh; +#if defined(CONFIG_MEDIA_CONTROLLER) + if (sd->v4l2_dev->mdev) { + entity = media_entity_get(&sd->entity); + if (!entity) { + ret = -EBUSY; + goto err; + } + } +#endif + + if (sd->internal_ops && sd->internal_ops->open) { + ret = sd->internal_ops->open(sd, subdev_fh); + if (ret < 0) + goto err; + } + + return 0; + +err: +#if defined(CONFIG_MEDIA_CONTROLLER) + if (entity) + media_entity_put(entity); +#endif + v4l2_fh_del(&subdev_fh->vfh); + v4l2_fh_exit(&subdev_fh->vfh); + subdev_fh_free(subdev_fh); + kfree(subdev_fh); + + return ret; +} + +static int subdev_close(struct file *file) +{ + struct video_device *vdev = video_devdata(file); + struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev); + struct v4l2_fh *vfh = file->private_data; + struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh); + + if (sd->internal_ops && sd->internal_ops->close) + sd->internal_ops->close(sd, subdev_fh); +#if defined(CONFIG_MEDIA_CONTROLLER) + if (sd->v4l2_dev->mdev) + media_entity_put(&sd->entity); +#endif + v4l2_fh_del(vfh); + v4l2_fh_exit(vfh); + subdev_fh_free(subdev_fh); + kfree(subdev_fh); + file->private_data = NULL; + + return 0; +} + +static long subdev_do_ioctl(struct file *file, unsigned int cmd, void *arg) +{ + struct video_device *vdev = video_devdata(file); + struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev); + struct v4l2_fh *vfh = file->private_data; +#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API) + struct v4l2_subdev_fh *subdev_fh = to_v4l2_subdev_fh(vfh); +#endif + + switch (cmd) { + case VIDIOC_QUERYCTRL: + return v4l2_subdev_queryctrl(sd, arg); + + case VIDIOC_QUERYMENU: + return v4l2_subdev_querymenu(sd, arg); + + case VIDIOC_G_CTRL: + return v4l2_subdev_g_ctrl(sd, arg); + + case VIDIOC_S_CTRL: + return v4l2_subdev_s_ctrl(sd, arg); + + case VIDIOC_G_EXT_CTRLS: + return v4l2_subdev_g_ext_ctrls(sd, arg); + + case VIDIOC_S_EXT_CTRLS: + return v4l2_subdev_s_ext_ctrls(sd, arg); + + case VIDIOC_TRY_EXT_CTRLS: + return v4l2_subdev_try_ext_ctrls(sd, arg); + + case VIDIOC_DQEVENT: + if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS)) + return -ENOIOCTLCMD; + + return v4l2_event_dequeue(vfh, arg, file->f_flags & O_NONBLOCK); + + case VIDIOC_SUBSCRIBE_EVENT: + return v4l2_subdev_call(sd, core, subscribe_event, vfh, arg); + + case VIDIOC_UNSUBSCRIBE_EVENT: + return v4l2_subdev_call(sd, core, unsubscribe_event, vfh, arg); +#if defined(CONFIG_VIDEO_V4L2_SUBDEV_API) + case VIDIOC_SUBDEV_G_FMT: { + struct v4l2_subdev_format *format = arg; + + if (format->which != V4L2_SUBDEV_FORMAT_TRY && + format->which != V4L2_SUBDEV_FORMAT_ACTIVE) + return -EINVAL; + + if (format->pad >= sd->entity.num_pads) + return -EINVAL; + + return v4l2_subdev_call(sd, pad, get_fmt, subdev_fh, format); + } + + case VIDIOC_SUBDEV_S_FMT: { + struct v4l2_subdev_format *format = arg; + + if (format->which != V4L2_SUBDEV_FORMAT_TRY && + format->which != V4L2_SUBDEV_FORMAT_ACTIVE) + return -EINVAL; + + if (format->pad >= sd->entity.num_pads) + return -EINVAL; + + return v4l2_subdev_call(sd, pad, set_fmt, subdev_fh, format); + } + + case VIDIOC_SUBDEV_G_CROP: { + struct v4l2_subdev_crop *crop = arg; + + if (crop->which != V4L2_SUBDEV_FORMAT_TRY && + crop->which != V4L2_SUBDEV_FORMAT_ACTIVE) + return -EINVAL; + + if (crop->pad >= sd->entity.num_pads) + return -EINVAL; + + return v4l2_subdev_call(sd, pad, get_crop, subdev_fh, crop); + } + + case VIDIOC_SUBDEV_S_CROP: { + struct v4l2_subdev_crop *crop = arg; + + if (crop->which != V4L2_SUBDEV_FORMAT_TRY && + crop->which != V4L2_SUBDEV_FORMAT_ACTIVE) + return -EINVAL; + + if (crop->pad >= sd->entity.num_pads) + return -EINVAL; + + return v4l2_subdev_call(sd, pad, set_crop, subdev_fh, crop); + } + + case VIDIOC_SUBDEV_ENUM_MBUS_CODE: { + struct v4l2_subdev_mbus_code_enum *code = arg; + + if (code->pad >= sd->entity.num_pads) + return -EINVAL; + + return v4l2_subdev_call(sd, pad, enum_mbus_code, subdev_fh, + code); + } + + case VIDIOC_SUBDEV_ENUM_FRAME_SIZE: { + struct v4l2_subdev_frame_size_enum *fse = arg; + + if (fse->pad >= sd->entity.num_pads) + return -EINVAL; + + return v4l2_subdev_call(sd, pad, enum_frame_size, subdev_fh, + fse); + } + + case VIDIOC_SUBDEV_G_FRAME_INTERVAL: + return v4l2_subdev_call(sd, video, g_frame_interval, arg); + + case VIDIOC_SUBDEV_S_FRAME_INTERVAL: + return v4l2_subdev_call(sd, video, s_frame_interval, arg); + + case VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL: { + struct v4l2_subdev_frame_interval_enum *fie = arg; + + if (fie->pad >= sd->entity.num_pads) + return -EINVAL; + + return v4l2_subdev_call(sd, pad, enum_frame_interval, subdev_fh, + fie); + } +#endif + default: + return v4l2_subdev_call(sd, core, ioctl, cmd, arg); + } + + return 0; +} + +static long subdev_ioctl(struct file *file, unsigned int cmd, + unsigned long arg) +{ + return video_usercopy(file, cmd, arg, subdev_do_ioctl); +} + +static unsigned int subdev_poll(struct file *file, poll_table *wait) +{ + struct video_device *vdev = video_devdata(file); + struct v4l2_subdev *sd = vdev_to_v4l2_subdev(vdev); + struct v4l2_fh *fh = file->private_data; + + if (!(sd->flags & V4L2_SUBDEV_FL_HAS_EVENTS)) + return POLLERR; + + poll_wait(file, &fh->events->wait, wait); + + if (v4l2_event_pending(fh)) + return POLLPRI; + + return 0; +} + +const struct v4l2_file_operations v4l2_subdev_fops = { + .owner = THIS_MODULE, + .open = subdev_open, + .unlocked_ioctl = subdev_ioctl, + .release = subdev_close, + .poll = subdev_poll, +}; + +void v4l2_subdev_init(struct v4l2_subdev *sd, const struct v4l2_subdev_ops *ops) +{ + INIT_LIST_HEAD(&sd->list); + BUG_ON(!ops); + sd->ops = ops; + sd->v4l2_dev = NULL; + sd->flags = 0; + sd->name[0] = '\0'; + sd->grp_id = 0; + sd->dev_priv = NULL; + sd->host_priv = NULL; +#if defined(CONFIG_MEDIA_CONTROLLER) + sd->entity.name = sd->name; + sd->entity.type = MEDIA_ENT_T_V4L2_SUBDEV; +#endif +} +EXPORT_SYMBOL(v4l2_subdev_init); |