/* * 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 <linux/export.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) fh->pad = kzalloc(sizeof(*fh->pad) * sd->entity.num_pads, GFP_KERNEL); if (fh->pad == NULL) return -ENOMEM; #endif return 0; } static void subdev_fh_free(struct v4l2_subdev_fh *fh) { #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API) kfree(fh->pad); fh->pad = 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; } v4l2_fh_init(&subdev_fh->vfh, vdev); 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_queryctrl(vfh->ctrl_handler, arg); case VIDIOC_QUERYMENU: return v4l2_querymenu(vfh->ctrl_handler, arg); case VIDIOC_G_CTRL: return v4l2_g_ctrl(vfh->ctrl_handler, arg); case VIDIOC_S_CTRL: return v4l2_s_ctrl(vfh, vfh->ctrl_handler, arg); case VIDIOC_G_EXT_CTRLS: return v4l2_g_ext_ctrls(vfh->ctrl_handler, arg); case VIDIOC_S_EXT_CTRLS: return v4l2_s_ext_ctrls(vfh, vfh->ctrl_handler, arg); case VIDIOC_TRY_EXT_CTRLS: return v4l2_try_ext_ctrls(vfh->ctrl_handler, 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); #ifdef CONFIG_VIDEO_ADV_DEBUG case VIDIOC_DBG_G_REGISTER: { struct v4l2_dbg_register *p = arg; if (!capable(CAP_SYS_ADMIN)) return -EPERM; return v4l2_subdev_call(sd, core, g_register, p); } case VIDIOC_DBG_S_REGISTER: { struct v4l2_dbg_register *p = arg; if (!capable(CAP_SYS_ADMIN)) return -EPERM; return v4l2_subdev_call(sd, core, s_register, p); } #endif case VIDIOC_LOG_STATUS: { int ret; pr_info("%s: ================= START STATUS =================\n", sd->name); ret = v4l2_subdev_call(sd, core, log_status); pr_info("%s: ================== END STATUS ==================\n", sd->name); return ret; } #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; struct v4l2_subdev_selection sel; int rval; if (crop->which != V4L2_SUBDEV_FORMAT_TRY && crop->which != V4L2_SUBDEV_FORMAT_ACTIVE) return -EINVAL; if (crop->pad >= sd->entity.num_pads) return -EINVAL; rval = v4l2_subdev_call(sd, pad, get_crop, subdev_fh, crop); if (rval != -ENOIOCTLCMD) return rval; memset(&sel, 0, sizeof(sel)); sel.which = crop->which; sel.pad = crop->pad; sel.target = V4L2_SEL_TGT_CROP; rval = v4l2_subdev_call( sd, pad, get_selection, subdev_fh, &sel); crop->rect = sel.r; return rval; } case VIDIOC_SUBDEV_S_CROP: { struct v4l2_subdev_crop *crop = arg; struct v4l2_subdev_selection sel; int rval; if (crop->which != V4L2_SUBDEV_FORMAT_TRY && crop->which != V4L2_SUBDEV_FORMAT_ACTIVE) return -EINVAL; if (crop->pad >= sd->entity.num_pads) return -EINVAL; rval = v4l2_subdev_call(sd, pad, set_crop, subdev_fh, crop); if (rval != -ENOIOCTLCMD) return rval; memset(&sel, 0, sizeof(sel)); sel.which = crop->which; sel.pad = crop->pad; sel.target = V4L2_SEL_TGT_CROP; sel.r = crop->rect; rval = v4l2_subdev_call( sd, pad, set_selection, subdev_fh, &sel); crop->rect = sel.r; return rval; } 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); } case VIDIOC_SUBDEV_G_SELECTION: { struct v4l2_subdev_selection *sel = arg; if (sel->which != V4L2_SUBDEV_FORMAT_TRY && sel->which != V4L2_SUBDEV_FORMAT_ACTIVE) return -EINVAL; if (sel->pad >= sd->entity.num_pads) return -EINVAL; return v4l2_subdev_call( sd, pad, get_selection, subdev_fh, sel); } case VIDIOC_SUBDEV_S_SELECTION: { struct v4l2_subdev_selection *sel = arg; if (sel->which != V4L2_SUBDEV_FORMAT_TRY && sel->which != V4L2_SUBDEV_FORMAT_ACTIVE) return -EINVAL; if (sel->pad >= sd->entity.num_pads) return -EINVAL; return v4l2_subdev_call( sd, pad, set_selection, subdev_fh, sel); } #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->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, }; #ifdef CONFIG_MEDIA_CONTROLLER int v4l2_subdev_link_validate_default(struct v4l2_subdev *sd, struct media_link *link, struct v4l2_subdev_format *source_fmt, struct v4l2_subdev_format *sink_fmt) { if (source_fmt->format.width != sink_fmt->format.width || source_fmt->format.height != sink_fmt->format.height || source_fmt->format.code != sink_fmt->format.code) return -EINVAL; return 0; } EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate_default); static int v4l2_subdev_link_validate_get_format(struct media_pad *pad, struct v4l2_subdev_format *fmt) { switch (media_entity_type(pad->entity)) { case MEDIA_ENT_T_V4L2_SUBDEV: fmt->which = V4L2_SUBDEV_FORMAT_ACTIVE; fmt->pad = pad->index; return v4l2_subdev_call(media_entity_to_v4l2_subdev( pad->entity), pad, get_fmt, NULL, fmt); default: WARN(1, "Driver bug! Wrong media entity type %d, entity %s\n", media_entity_type(pad->entity), pad->entity->name); /* Fall through */ case MEDIA_ENT_T_DEVNODE_V4L: return -EINVAL; } } int v4l2_subdev_link_validate(struct media_link *link) { struct v4l2_subdev *sink; struct v4l2_subdev_format sink_fmt, source_fmt; int rval; rval = v4l2_subdev_link_validate_get_format( link->source, &source_fmt); if (rval < 0) return 0; rval = v4l2_subdev_link_validate_get_format( link->sink, &sink_fmt); if (rval < 0) return 0; sink = media_entity_to_v4l2_subdev(link->sink->entity); rval = v4l2_subdev_call(sink, pad, link_validate, link, &source_fmt, &sink_fmt); if (rval != -ENOIOCTLCMD) return rval; return v4l2_subdev_link_validate_default( sink, link, &source_fmt, &sink_fmt); } EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate); #endif /* CONFIG_MEDIA_CONTROLLER */ 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);