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117 lines
2.7 KiB
117 lines
2.7 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* v4l2-fh.c |
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* |
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* V4L2 file handles. |
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* |
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* Copyright (C) 2009--2010 Nokia Corporation. |
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* |
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* Contact: Sakari Ailus <[email protected]> |
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*/ |
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#include <linux/bitops.h> |
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#include <linux/slab.h> |
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#include <linux/export.h> |
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#include <media/v4l2-dev.h> |
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#include <media/v4l2-fh.h> |
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#include <media/v4l2-event.h> |
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#include <media/v4l2-ioctl.h> |
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#include <media/v4l2-mc.h> |
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void v4l2_fh_init(struct v4l2_fh *fh, struct video_device *vdev) |
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{ |
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fh->vdev = vdev; |
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/* Inherit from video_device. May be overridden by the driver. */ |
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fh->ctrl_handler = vdev->ctrl_handler; |
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INIT_LIST_HEAD(&fh->list); |
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set_bit(V4L2_FL_USES_V4L2_FH, &fh->vdev->flags); |
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/* |
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* determine_valid_ioctls() does not know if struct v4l2_fh |
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* is used by this driver, but here we do. So enable the |
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* prio ioctls here. |
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*/ |
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set_bit(_IOC_NR(VIDIOC_G_PRIORITY), vdev->valid_ioctls); |
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set_bit(_IOC_NR(VIDIOC_S_PRIORITY), vdev->valid_ioctls); |
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fh->prio = V4L2_PRIORITY_UNSET; |
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init_waitqueue_head(&fh->wait); |
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INIT_LIST_HEAD(&fh->available); |
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INIT_LIST_HEAD(&fh->subscribed); |
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fh->sequence = -1; |
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mutex_init(&fh->subscribe_lock); |
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} |
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EXPORT_SYMBOL_GPL(v4l2_fh_init); |
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void v4l2_fh_add(struct v4l2_fh *fh) |
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{ |
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unsigned long flags; |
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v4l2_prio_open(fh->vdev->prio, &fh->prio); |
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spin_lock_irqsave(&fh->vdev->fh_lock, flags); |
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list_add(&fh->list, &fh->vdev->fh_list); |
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spin_unlock_irqrestore(&fh->vdev->fh_lock, flags); |
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} |
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EXPORT_SYMBOL_GPL(v4l2_fh_add); |
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int v4l2_fh_open(struct file *filp) |
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{ |
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struct video_device *vdev = video_devdata(filp); |
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struct v4l2_fh *fh = kzalloc(sizeof(*fh), GFP_KERNEL); |
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filp->private_data = fh; |
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if (fh == NULL) |
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return -ENOMEM; |
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v4l2_fh_init(fh, vdev); |
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v4l2_fh_add(fh); |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(v4l2_fh_open); |
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void v4l2_fh_del(struct v4l2_fh *fh) |
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{ |
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unsigned long flags; |
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spin_lock_irqsave(&fh->vdev->fh_lock, flags); |
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list_del_init(&fh->list); |
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spin_unlock_irqrestore(&fh->vdev->fh_lock, flags); |
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v4l2_prio_close(fh->vdev->prio, fh->prio); |
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} |
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EXPORT_SYMBOL_GPL(v4l2_fh_del); |
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void v4l2_fh_exit(struct v4l2_fh *fh) |
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{ |
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if (fh->vdev == NULL) |
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return; |
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v4l_disable_media_source(fh->vdev); |
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v4l2_event_unsubscribe_all(fh); |
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mutex_destroy(&fh->subscribe_lock); |
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fh->vdev = NULL; |
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} |
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EXPORT_SYMBOL_GPL(v4l2_fh_exit); |
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int v4l2_fh_release(struct file *filp) |
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{ |
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struct v4l2_fh *fh = filp->private_data; |
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if (fh) { |
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v4l2_fh_del(fh); |
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v4l2_fh_exit(fh); |
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kfree(fh); |
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filp->private_data = NULL; |
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} |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(v4l2_fh_release); |
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int v4l2_fh_is_singular(struct v4l2_fh *fh) |
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{ |
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unsigned long flags; |
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int is_singular; |
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if (fh == NULL || fh->vdev == NULL) |
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return 0; |
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spin_lock_irqsave(&fh->vdev->fh_lock, flags); |
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is_singular = list_is_singular(&fh->list); |
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spin_unlock_irqrestore(&fh->vdev->fh_lock, flags); |
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return is_singular; |
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} |
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EXPORT_SYMBOL_GPL(v4l2_fh_is_singular);
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