media: remove the old videobuf framework

The last driver that still used this old framework has been converted
to the videobuf2 framework. So it is now time to delete the old videobuf
code.

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>

1 files changed, 0 insertions, 1198 deletions

diff --git a/drivers/media/v4l2-core/videobuf-core.c b/drivers/media/v4l2-core/videobuf-core.c
deleted file mode 100644
index 606a271bdd2d..000000000000
--- a/drivers/media/v4l2-core/videobuf-core.c
+++ /dev/null
@@ -1,1198 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * generic helper functions for handling video4linux capture buffers
- *
- * (c) 2007 Mauro Carvalho Chehab, <mchehab@kernel.org>
- *
- * Highly based on video-buf written originally by:
- * (c) 2001,02 Gerd Knorr <kraxel@bytesex.org>
- * (c) 2006 Mauro Carvalho Chehab, <mchehab@kernel.org>
- * (c) 2006 Ted Walther and John Sokol
- */
-
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/moduleparam.h>
-#include <linux/mm.h>
-#include <linux/sched.h>
-#include <linux/slab.h>
-#include <linux/interrupt.h>
-
-#include <media/videobuf-core.h>
-#include <media/v4l2-common.h>
-
-#define MAGIC_BUFFER 0x20070728
-#define MAGIC_CHECK(is, should)						\
-	do {								\
-		if (unlikely((is) != (should))) {			\
-			printk(KERN_ERR					\
-				"magic mismatch: %x (expected %x)\n",	\
-					is, should);			\
-			BUG();						\
-		}							\
-	} while (0)
-
-static int debug;
-module_param(debug, int, 0644);
-
-MODULE_DESCRIPTION("helper module to manage video4linux buffers");
-MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@kernel.org>");
-MODULE_LICENSE("GPL");
-
-#define dprintk(level, fmt, arg...)					\
-	do {								\
-		if (debug >= level)					\
-			printk(KERN_DEBUG "vbuf: " fmt, ## arg);	\
-	} while (0)
-
-/* --------------------------------------------------------------------- */
-
-#define CALL(q, f, arg...)						\
-	((q->int_ops->f) ? q->int_ops->f(arg) : 0)
-#define CALLPTR(q, f, arg...)						\
-	((q->int_ops->f) ? q->int_ops->f(arg) : NULL)
-
-struct videobuf_buffer *videobuf_alloc_vb(struct videobuf_queue *q)
-{
-	struct videobuf_buffer *vb;
-
-	BUG_ON(q->msize < sizeof(*vb));
-
-	if (!q->int_ops || !q->int_ops->alloc_vb) {
-		printk(KERN_ERR "No specific ops defined!\n");
-		BUG();
-	}
-
-	vb = q->int_ops->alloc_vb(q->msize);
-	if (NULL != vb) {
-		init_waitqueue_head(&vb->done);
-		vb->magic = MAGIC_BUFFER;
-	}
-
-	return vb;
-}
-EXPORT_SYMBOL_GPL(videobuf_alloc_vb);
-
-static int state_neither_active_nor_queued(struct videobuf_queue *q,
-					   struct videobuf_buffer *vb)
-{
-	unsigned long flags;
-	bool rc;
-
-	spin_lock_irqsave(q->irqlock, flags);
-	rc = vb->state != VIDEOBUF_ACTIVE && vb->state != VIDEOBUF_QUEUED;
-	spin_unlock_irqrestore(q->irqlock, flags);
-	return rc;
-};
-
-int videobuf_waiton(struct videobuf_queue *q, struct videobuf_buffer *vb,
-		int non_blocking, int intr)
-{
-	bool is_ext_locked;
-	int ret = 0;
-
-	MAGIC_CHECK(vb->magic, MAGIC_BUFFER);
-
-	if (non_blocking) {
-		if (state_neither_active_nor_queued(q, vb))
-			return 0;
-		return -EAGAIN;
-	}
-
-	is_ext_locked = q->ext_lock && mutex_is_locked(q->ext_lock);
-
-	/* Release vdev lock to prevent this wait from blocking outside access to
-	   the device. */
-	if (is_ext_locked)
-		mutex_unlock(q->ext_lock);
-	if (intr)
-		ret = wait_event_interruptible(vb->done,
-					state_neither_active_nor_queued(q, vb));
-	else
-		wait_event(vb->done, state_neither_active_nor_queued(q, vb));
-	/* Relock */
-	if (is_ext_locked)
-		mutex_lock(q->ext_lock);
-
-	return ret;
-}
-EXPORT_SYMBOL_GPL(videobuf_waiton);
-
-int videobuf_iolock(struct videobuf_queue *q, struct videobuf_buffer *vb,
-		    struct v4l2_framebuffer *fbuf)
-{
-	MAGIC_CHECK(vb->magic, MAGIC_BUFFER);
-	MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
-
-	return CALL(q, iolock, q, vb, fbuf);
-}
-EXPORT_SYMBOL_GPL(videobuf_iolock);
-
-void *videobuf_queue_to_vaddr(struct videobuf_queue *q,
-			      struct videobuf_buffer *buf)
-{
-	if (q->int_ops->vaddr)
-		return q->int_ops->vaddr(buf);
-	return NULL;
-}
-EXPORT_SYMBOL_GPL(videobuf_queue_to_vaddr);
-
-/* --------------------------------------------------------------------- */
-
-
-void videobuf_queue_core_init(struct videobuf_queue *q,
-			 const struct videobuf_queue_ops *ops,
-			 struct device *dev,
-			 spinlock_t *irqlock,
-			 enum v4l2_buf_type type,
-			 enum v4l2_field field,
-			 unsigned int msize,
-			 void *priv,
-			 struct videobuf_qtype_ops *int_ops,
-			 struct mutex *ext_lock)
-{
-	BUG_ON(!q);
-	memset(q, 0, sizeof(*q));
-	q->irqlock   = irqlock;
-	q->ext_lock  = ext_lock;
-	q->dev       = dev;
-	q->type      = type;
-	q->field     = field;
-	q->msize     = msize;
-	q->ops       = ops;
-	q->priv_data = priv;
-	q->int_ops   = int_ops;
-
-	/* All buffer operations are mandatory */
-	BUG_ON(!q->ops->buf_setup);
-	BUG_ON(!q->ops->buf_prepare);
-	BUG_ON(!q->ops->buf_queue);
-	BUG_ON(!q->ops->buf_release);
-
-	/* Lock is mandatory for queue_cancel to work */
-	BUG_ON(!irqlock);
-
-	/* Having implementations for abstract methods are mandatory */
-	BUG_ON(!q->int_ops);
-
-	mutex_init(&q->vb_lock);
-	init_waitqueue_head(&q->wait);
-	INIT_LIST_HEAD(&q->stream);
-}
-EXPORT_SYMBOL_GPL(videobuf_queue_core_init);
-
-/* Locking: Only usage in bttv unsafe find way to remove */
-int videobuf_queue_is_busy(struct videobuf_queue *q)
-{
-	int i;
-
-	MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
-
-	if (q->streaming) {
-		dprintk(1, "busy: streaming active\n");
-		return 1;
-	}
-	if (q->reading) {
-		dprintk(1, "busy: pending read #1\n");
-		return 1;
-	}
-	if (q->read_buf) {
-		dprintk(1, "busy: pending read #2\n");
-		return 1;
-	}
-	for (i = 0; i < VIDEO_MAX_FRAME; i++) {
-		if (NULL == q->bufs[i])
-			continue;
-		if (q->bufs[i]->map) {
-			dprintk(1, "busy: buffer #%d mapped\n", i);
-			return 1;
-		}
-		if (q->bufs[i]->state == VIDEOBUF_QUEUED) {
-			dprintk(1, "busy: buffer #%d queued\n", i);
-			return 1;
-		}
-		if (q->bufs[i]->state == VIDEOBUF_ACTIVE) {
-			dprintk(1, "busy: buffer #%d active\n", i);
-			return 1;
-		}
-	}
-	return 0;
-}
-EXPORT_SYMBOL_GPL(videobuf_queue_is_busy);
-
-/*
- * __videobuf_free() - free all the buffers and their control structures
- *
- * This function can only be called if streaming/reading is off, i.e. no buffers
- * are under control of the driver.
- */
-/* Locking: Caller holds q->vb_lock */
-static int __videobuf_free(struct videobuf_queue *q)
-{
-	int i;
-
-	dprintk(1, "%s\n", __func__);
-	if (!q)
-		return 0;
-
-	if (q->streaming || q->reading) {
-		dprintk(1, "Cannot free buffers when streaming or reading\n");
-		return -EBUSY;
-	}
-
-	MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
-
-	for (i = 0; i < VIDEO_MAX_FRAME; i++)
-		if (q->bufs[i] && q->bufs[i]->map) {
-			dprintk(1, "Cannot free mmapped buffers\n");
-			return -EBUSY;
-		}
-
-	for (i = 0; i < VIDEO_MAX_FRAME; i++) {
-		if (NULL == q->bufs[i])
-			continue;
-		q->ops->buf_release(q, q->bufs[i]);
-		kfree(q->bufs[i]);
-		q->bufs[i] = NULL;
-	}
-
-	return 0;
-}
-
-/* Locking: Caller holds q->vb_lock */
-void videobuf_queue_cancel(struct videobuf_queue *q)
-{
-	unsigned long flags = 0;
-	int i;
-
-	q->streaming = 0;
-	q->reading  = 0;
-	wake_up_interruptible_sync(&q->wait);
-
-	/* remove queued buffers from list */
-	spin_lock_irqsave(q->irqlock, flags);
-	for (i = 0; i < VIDEO_MAX_FRAME; i++) {
-		if (NULL == q->bufs[i])
-			continue;
-		if (q->bufs[i]->state == VIDEOBUF_QUEUED) {
-			list_del(&q->bufs[i]->queue);
-			q->bufs[i]->state = VIDEOBUF_ERROR;
-			wake_up_all(&q->bufs[i]->done);
-		}
-	}
-	spin_unlock_irqrestore(q->irqlock, flags);
-
-	/* free all buffers + clear queue */
-	for (i = 0; i < VIDEO_MAX_FRAME; i++) {
-		if (NULL == q->bufs[i])
-			continue;
-		q->ops->buf_release(q, q->bufs[i]);
-	}
-	INIT_LIST_HEAD(&q->stream);
-}
-EXPORT_SYMBOL_GPL(videobuf_queue_cancel);
-
-/* --------------------------------------------------------------------- */
-
-/* Locking: Caller holds q->vb_lock */
-enum v4l2_field videobuf_next_field(struct videobuf_queue *q)
-{
-	enum v4l2_field field = q->field;
-
-	BUG_ON(V4L2_FIELD_ANY == field);
-
-	if (V4L2_FIELD_ALTERNATE == field) {
-		if (V4L2_FIELD_TOP == q->last) {
-			field   = V4L2_FIELD_BOTTOM;
-			q->last = V4L2_FIELD_BOTTOM;
-		} else {
-			field   = V4L2_FIELD_TOP;
-			q->last = V4L2_FIELD_TOP;
-		}
-	}
-	return field;
-}
-EXPORT_SYMBOL_GPL(videobuf_next_field);
-
-/* Locking: Caller holds q->vb_lock */
-static void videobuf_status(struct videobuf_queue *q, struct v4l2_buffer *b,
-			    struct videobuf_buffer *vb, enum v4l2_buf_type type)
-{
-	MAGIC_CHECK(vb->magic, MAGIC_BUFFER);
-	MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
-
-	b->index    = vb->i;
-	b->type     = type;
-
-	b->memory   = vb->memory;
-	switch (b->memory) {
-	case V4L2_MEMORY_MMAP:
-		b->m.offset  = vb->boff;
-		b->length    = vb->bsize;
-		break;
-	case V4L2_MEMORY_USERPTR:
-		b->m.userptr = vb->baddr;
-		b->length    = vb->bsize;
-		break;
-	case V4L2_MEMORY_OVERLAY:
-		b->m.offset  = vb->boff;
-		break;
-	case V4L2_MEMORY_DMABUF:
-		/* DMABUF is not handled in videobuf framework */
-		break;
-	}
-
-	b->flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
-	if (vb->map)
-		b->flags |= V4L2_BUF_FLAG_MAPPED;
-
-	switch (vb->state) {
-	case VIDEOBUF_PREPARED:
-	case VIDEOBUF_QUEUED:
-	case VIDEOBUF_ACTIVE:
-		b->flags |= V4L2_BUF_FLAG_QUEUED;
-		break;
-	case VIDEOBUF_ERROR:
-		b->flags |= V4L2_BUF_FLAG_ERROR;
-		fallthrough;
-	case VIDEOBUF_DONE:
-		b->flags |= V4L2_BUF_FLAG_DONE;
-		break;
-	case VIDEOBUF_NEEDS_INIT:
-	case VIDEOBUF_IDLE:
-		/* nothing */
-		break;
-	}
-
-	b->field     = vb->field;
-	v4l2_buffer_set_timestamp(b, vb->ts);
-	b->bytesused = vb->size;
-	b->sequence  = vb->field_count >> 1;
-}
-
-int videobuf_mmap_free(struct videobuf_queue *q)
-{
-	int ret;
-	videobuf_queue_lock(q);
-	ret = __videobuf_free(q);
-	videobuf_queue_unlock(q);
-	return ret;
-}
-EXPORT_SYMBOL_GPL(videobuf_mmap_free);
-
-/* Locking: Caller holds q->vb_lock */
-int __videobuf_mmap_setup(struct videobuf_queue *q,
-			unsigned int bcount, unsigned int bsize,
-			enum v4l2_memory memory)
-{
-	unsigned int i;
-	int err;
-
-	MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
-
-	err = __videobuf_free(q);
-	if (0 != err)
-		return err;
-
-	/* Allocate and initialize buffers */
-	for (i = 0; i < bcount; i++) {
-		q->bufs[i] = videobuf_alloc_vb(q);
-
-		if (NULL == q->bufs[i])
-			break;
-
-		q->bufs[i]->i      = i;
-		q->bufs[i]->memory = memory;
-		q->bufs[i]->bsize  = bsize;
-		switch (memory) {
-		case V4L2_MEMORY_MMAP:
-			q->bufs[i]->boff = PAGE_ALIGN(bsize) * i;
-			break;
-		case V4L2_MEMORY_USERPTR:
-		case V4L2_MEMORY_OVERLAY:
-		case V4L2_MEMORY_DMABUF:
-			/* nothing */
-			break;
-		}
-	}
-
-	if (!i)
-		return -ENOMEM;
-
-	dprintk(1, "mmap setup: %d buffers, %d bytes each\n", i, bsize);
-
-	return i;
-}
-EXPORT_SYMBOL_GPL(__videobuf_mmap_setup);
-
-int videobuf_mmap_setup(struct videobuf_queue *q,
-			unsigned int bcount, unsigned int bsize,
-			enum v4l2_memory memory)
-{
-	int ret;
-	videobuf_queue_lock(q);
-	ret = __videobuf_mmap_setup(q, bcount, bsize, memory);
-	videobuf_queue_unlock(q);
-	return ret;
-}
-EXPORT_SYMBOL_GPL(videobuf_mmap_setup);
-
-int videobuf_reqbufs(struct videobuf_queue *q,
-		 struct v4l2_requestbuffers *req)
-{
-	unsigned int size, count;
-	int retval;
-
-	if (req->memory != V4L2_MEMORY_MMAP     &&
-	    req->memory != V4L2_MEMORY_USERPTR  &&
-	    req->memory != V4L2_MEMORY_OVERLAY) {
-		dprintk(1, "reqbufs: memory type invalid\n");
-		return -EINVAL;
-	}
-
-	videobuf_queue_lock(q);
-	if (req->type != q->type) {
-		dprintk(1, "reqbufs: queue type invalid\n");
-		retval = -EINVAL;
-		goto done;
-	}
-
-	if (q->streaming) {
-		dprintk(1, "reqbufs: streaming already exists\n");
-		retval = -EBUSY;
-		goto done;
-	}
-	if (!list_empty(&q->stream)) {
-		dprintk(1, "reqbufs: stream running\n");
-		retval = -EBUSY;
-		goto done;
-	}
-
-	if (req->count == 0) {
-		dprintk(1, "reqbufs: count invalid (%d)\n", req->count);
-		retval = __videobuf_free(q);
-		goto done;
-	}
-
-	count = req->count;
-	if (count > VIDEO_MAX_FRAME)
-		count = VIDEO_MAX_FRAME;
-	size = 0;
-	q->ops->buf_setup(q, &count, &size);
-	dprintk(1, "reqbufs: bufs=%d, size=0x%x [%u pages total]\n",
-		count, size,
-		(unsigned int)((count * PAGE_ALIGN(size)) >> PAGE_SHIFT));
-
-	retval = __videobuf_mmap_setup(q, count, size, req->memory);
-	if (retval < 0) {
-		dprintk(1, "reqbufs: mmap setup returned %d\n", retval);
-		goto done;
-	}
-
-	req->count = retval;
-	retval = 0;
-
- done:
-	videobuf_queue_unlock(q);
-	return retval;
-}
-EXPORT_SYMBOL_GPL(videobuf_reqbufs);
-
-int videobuf_querybuf(struct videobuf_queue *q, struct v4l2_buffer *b)
-{
-	int ret = -EINVAL;
-
-	videobuf_queue_lock(q);
-	if (unlikely(b->type != q->type)) {
-		dprintk(1, "querybuf: Wrong type.\n");
-		goto done;
-	}
-	if (unlikely(b->index >= VIDEO_MAX_FRAME)) {
-		dprintk(1, "querybuf: index out of range.\n");
-		goto done;
-	}
-	if (unlikely(NULL == q->bufs[b->index])) {
-		dprintk(1, "querybuf: buffer is null.\n");
-		goto done;
-	}
-
-	videobuf_status(q, b, q->bufs[b->index], q->type);
-
-	ret = 0;
-done:
-	videobuf_queue_unlock(q);
-	return ret;
-}
-EXPORT_SYMBOL_GPL(videobuf_querybuf);
-
-int videobuf_qbuf(struct videobuf_queue *q, struct v4l2_buffer *b)
-{
-	struct videobuf_buffer *buf;
-	enum v4l2_field field;
-	unsigned long flags = 0;
-	int retval;
-
-	MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
-
-	if (b->memory == V4L2_MEMORY_MMAP)
-		mmap_read_lock(current->mm);
-
-	videobuf_queue_lock(q);
-	retval = -EBUSY;
-	if (q->reading) {
-		dprintk(1, "qbuf: Reading running...\n");
-		goto done;
-	}
-	retval = -EINVAL;
-	if (b->type != q->type) {
-		dprintk(1, "qbuf: Wrong type.\n");
-		goto done;
-	}
-	if (b->index >= VIDEO_MAX_FRAME) {
-		dprintk(1, "qbuf: index out of range.\n");
-		goto done;
-	}
-	buf = q->bufs[b->index];
-	if (NULL == buf) {
-		dprintk(1, "qbuf: buffer is null.\n");
-		goto done;
-	}
-	MAGIC_CHECK(buf->magic, MAGIC_BUFFER);
-	if (buf->memory != b->memory) {
-		dprintk(1, "qbuf: memory type is wrong.\n");
-		goto done;
-	}
-	if (buf->state != VIDEOBUF_NEEDS_INIT && buf->state != VIDEOBUF_IDLE) {
-		dprintk(1, "qbuf: buffer is already queued or active.\n");
-		goto done;
-	}
-
-	switch (b->memory) {
-	case V4L2_MEMORY_MMAP:
-		if (0 == buf->baddr) {
-			dprintk(1, "qbuf: mmap requested but buffer addr is zero!\n");
-			goto done;
-		}
-		if (q->type == V4L2_BUF_TYPE_VIDEO_OUTPUT
-		    || q->type == V4L2_BUF_TYPE_VBI_OUTPUT
-		    || q->type == V4L2_BUF_TYPE_SLICED_VBI_OUTPUT
-		    || q->type == V4L2_BUF_TYPE_SDR_OUTPUT) {
-			buf->size = b->bytesused;
-			buf->field = b->field;
-			buf->ts = v4l2_buffer_get_timestamp(b);
-		}
-		break;
-	case V4L2_MEMORY_USERPTR:
-		if (b->length < buf->bsize) {
-			dprintk(1, "qbuf: buffer length is not enough\n");
-			goto done;
-		}
-		if (VIDEOBUF_NEEDS_INIT != buf->state &&
-		    buf->baddr != b->m.userptr)
-			q->ops->buf_release(q, buf);
-		buf->baddr = b->m.userptr;
-		break;
-	case V4L2_MEMORY_OVERLAY:
-		buf->boff = b->m.offset;
-		break;
-	default:
-		dprintk(1, "qbuf: wrong memory type\n");
-		goto done;
-	}
-
-	dprintk(1, "qbuf: requesting next field\n");
-	field = videobuf_next_field(q);
-	retval = q->ops->buf_prepare(q, buf, field);
-	if (0 != retval) {
-		dprintk(1, "qbuf: buffer_prepare returned %d\n", retval);
-		goto done;
-	}
-
-	list_add_tail(&buf->stream, &q->stream);
-	if (q->streaming) {
-		spin_lock_irqsave(q->irqlock, flags);
-		q->ops->buf_queue(q, buf);
-		spin_unlock_irqrestore(q->irqlock, flags);
-	}
-	dprintk(1, "qbuf: succeeded\n");
-	retval = 0;
-	wake_up_interruptible_sync(&q->wait);
-
-done:
-	videobuf_queue_unlock(q);
-
-	if (b->memory == V4L2_MEMORY_MMAP)
-		mmap_read_unlock(current->mm);
-
-	return retval;
-}
-EXPORT_SYMBOL_GPL(videobuf_qbuf);
-
-/* Locking: Caller holds q->vb_lock */
-static int stream_next_buffer_check_queue(struct videobuf_queue *q, int noblock)
-{
-	int retval;
-
-checks:
-	if (!q->streaming) {
-		dprintk(1, "next_buffer: Not streaming\n");
-		retval = -EINVAL;
-		goto done;
-	}
-
-	if (list_empty(&q->stream)) {
-		if (noblock) {
-			retval = -EAGAIN;
-			dprintk(2, "next_buffer: no buffers to dequeue\n");
-			goto done;
-		} else {
-			dprintk(2, "next_buffer: waiting on buffer\n");
-
-			/* Drop lock to avoid deadlock with qbuf */
-			videobuf_queue_unlock(q);
-
-			/* Checking list_empty and streaming is safe without
-			 * locks because we goto checks to validate while
-			 * holding locks before proceeding */
-			retval = wait_event_interruptible(q->wait,
-				!list_empty(&q->stream) || !q->streaming);
-			videobuf_queue_lock(q);
-
-			if (retval)
-				goto done;
-
-			goto checks;
-		}
-	}
-
-	retval = 0;
-
-done:
-	return retval;
-}
-
-/* Locking: Caller holds q->vb_lock */
-static int stream_next_buffer(struct videobuf_queue *q,
-			struct videobuf_buffer **vb, int nonblocking)
-{
-	int retval;
-	struct videobuf_buffer *buf = NULL;
-
-	retval = stream_next_buffer_check_queue(q, nonblocking);
-	if (retval)
-		goto done;
-
-	buf = list_entry(q->stream.next, struct videobuf_buffer, stream);
-	retval = videobuf_waiton(q, buf, nonblocking, 1);
-	if (retval < 0)
-		goto done;
-
-	*vb = buf;
-done:
-	return retval;
-}
-
-int videobuf_dqbuf(struct videobuf_queue *q,
-		   struct v4l2_buffer *b, int nonblocking)
-{
-	struct videobuf_buffer *buf = NULL;
-	int retval;
-
-	MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
-
-	memset(b, 0, sizeof(*b));
-	videobuf_queue_lock(q);
-
-	retval = stream_next_buffer(q, &buf, nonblocking);
-	if (retval < 0) {
-		dprintk(1, "dqbuf: next_buffer error: %i\n", retval);
-		goto done;
-	}
-
-	switch (buf->state) {
-	case VIDEOBUF_ERROR:
-		dprintk(1, "dqbuf: state is error\n");
-		break;
-	case VIDEOBUF_DONE:
-		dprintk(1, "dqbuf: state is done\n");
-		break;
-	default:
-		dprintk(1, "dqbuf: state invalid\n");
-		retval = -EINVAL;
-		goto done;
-	}
-	CALL(q, sync, q, buf);
-	videobuf_status(q, b, buf, q->type);
-	list_del(&buf->stream);
-	buf->state = VIDEOBUF_IDLE;
-	b->flags &= ~V4L2_BUF_FLAG_DONE;
-done:
-	videobuf_queue_unlock(q);
-	return retval;
-}
-EXPORT_SYMBOL_GPL(videobuf_dqbuf);
-
-int videobuf_streamon(struct videobuf_queue *q)
-{
-	struct videobuf_buffer *buf;
-	unsigned long flags = 0;
-	int retval;
-
-	videobuf_queue_lock(q);
-	retval = -EBUSY;
-	if (q->reading)
-		goto done;
-	retval = 0;
-	if (q->streaming)
-		goto done;
-	q->streaming = 1;
-	spin_lock_irqsave(q->irqlock, flags);
-	list_for_each_entry(buf, &q->stream, stream)
-		if (buf->state == VIDEOBUF_PREPARED)
-			q->ops->buf_queue(q, buf);
-	spin_unlock_irqrestore(q->irqlock, flags);
-
-	wake_up_interruptible_sync(&q->wait);
-done:
-	videobuf_queue_unlock(q);
-	return retval;
-}
-EXPORT_SYMBOL_GPL(videobuf_streamon);
-
-/* Locking: Caller holds q->vb_lock */
-static int __videobuf_streamoff(struct videobuf_queue *q)
-{
-	if (!q->streaming)
-		return -EINVAL;
-
-	videobuf_queue_cancel(q);
-
-	return 0;
-}
-
-int videobuf_streamoff(struct videobuf_queue *q)
-{
-	int retval;
-
-	videobuf_queue_lock(q);
-	retval = __videobuf_streamoff(q);
-	videobuf_queue_unlock(q);
-
-	return retval;
-}
-EXPORT_SYMBOL_GPL(videobuf_streamoff);
-
-/* Locking: Caller holds q->vb_lock */
-static ssize_t videobuf_read_zerocopy(struct videobuf_queue *q,
-				      char __user *data,
-				      size_t count, loff_t *ppos)
-{
-	enum v4l2_field field;
-	unsigned long flags = 0;
-	int retval;
-
-	MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
-
-	/* setup stuff */
-	q->read_buf = videobuf_alloc_vb(q);
-	if (NULL == q->read_buf)
-		return -ENOMEM;
-
-	q->read_buf->memory = V4L2_MEMORY_USERPTR;
-	q->read_buf->baddr  = (unsigned long)data;
-	q->read_buf->bsize  = count;
-
-	field = videobuf_next_field(q);
-	retval = q->ops->buf_prepare(q, q->read_buf, field);
-	if (0 != retval)
-		goto done;
-
-	/* start capture & wait */
-	spin_lock_irqsave(q->irqlock, flags);
-	q->ops->buf_queue(q, q->read_buf);
-	spin_unlock_irqrestore(q->irqlock, flags);
-	retval = videobuf_waiton(q, q->read_buf, 0, 0);
-	if (0 == retval) {
-		CALL(q, sync, q, q->read_buf);
-		if (VIDEOBUF_ERROR == q->read_buf->state)
-			retval = -EIO;
-		else
-			retval = q->read_buf->size;
-	}
-
-done:
-	/* cleanup */
-	q->ops->buf_release(q, q->read_buf);
-	kfree(q->read_buf);
-	q->read_buf = NULL;
-	return retval;
-}
-
-static int __videobuf_copy_to_user(struct videobuf_queue *q,
-				   struct videobuf_buffer *buf,
-				   char __user *data, size_t count,
-				   int nonblocking)
-{
-	void *vaddr = CALLPTR(q, vaddr, buf);
-
-	/* copy to userspace */
-	if (count > buf->size - q->read_off)
-		count = buf->size - q->read_off;
-
-	if (copy_to_user(data, vaddr + q->read_off, count))
-		return -EFAULT;
-
-	return count;
-}
-
-static int __videobuf_copy_stream(struct videobuf_queue *q,
-				  struct videobuf_buffer *buf,
-				  char __user *data, size_t count, size_t pos,
-				  int vbihack, int nonblocking)
-{
-	unsigned int *fc = CALLPTR(q, vaddr, buf);
-
-	if (vbihack) {
-		/* dirty, undocumented hack -- pass the frame counter
-			* within the last four bytes of each vbi data block.
-			* We need that one to maintain backward compatibility
-			* to all vbi decoding software out there ... */
-		fc += (buf->size >> 2) - 1;
-		*fc = buf->field_count >> 1;
-		dprintk(1, "vbihack: %d\n", *fc);
-	}
-
-	/* copy stuff using the common method */
-	count = __videobuf_copy_to_user(q, buf, data, count, nonblocking);
-
-	if ((count == -EFAULT) && (pos == 0))
-		return -EFAULT;
-
-	return count;
-}
-
-ssize_t videobuf_read_one(struct videobuf_queue *q,
-			  char __user *data, size_t count, loff_t *ppos,
-			  int nonblocking)
-{
-	enum v4l2_field field;
-	unsigned long flags = 0;
-	unsigned size = 0, nbufs = 1;
-	int retval;
-
-	MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
-
-	videobuf_queue_lock(q);
-
-	q->ops->buf_setup(q, &nbufs, &size);
-
-	if (NULL == q->read_buf  &&
-	    count >= size        &&
-	    !nonblocking) {
-		retval = videobuf_read_zerocopy(q, data, count, ppos);
-		if (retval >= 0  ||  retval == -EIO)
-			/* ok, all done */
-			goto done;
-		/* fallback to kernel bounce buffer on failures */
-	}
-
-	if (NULL == q->read_buf) {
-		/* need to capture a new frame */
-		retval = -ENOMEM;
-		q->read_buf = videobuf_alloc_vb(q);
-
-		dprintk(1, "video alloc=0x%p\n", q->read_buf);
-		if (NULL == q->read_buf)
-			goto done;
-		q->read_buf->memory = V4L2_MEMORY_USERPTR;
-		q->read_buf->bsize = count; /* preferred size */
-		field = videobuf_next_field(q);
-		retval = q->ops->buf_prepare(q, q->read_buf, field);
-
-		if (0 != retval) {
-			kfree(q->read_buf);
-			q->read_buf = NULL;
-			goto done;
-		}
-
-		spin_lock_irqsave(q->irqlock, flags);
-		q->ops->buf_queue(q, q->read_buf);
-		spin_unlock_irqrestore(q->irqlock, flags);
-
-		q->read_off = 0;
-	}
-
-	/* wait until capture is done */
-	retval = videobuf_waiton(q, q->read_buf, nonblocking, 1);
-	if (0 != retval)
-		goto done;
-
-	CALL(q, sync, q, q->read_buf);
-
-	if (VIDEOBUF_ERROR == q->read_buf->state) {
-		/* catch I/O errors */
-		q->ops->buf_release(q, q->read_buf);
-		kfree(q->read_buf);
-		q->read_buf = NULL;
-		retval = -EIO;
-		goto done;
-	}
-
-	/* Copy to userspace */
-	retval = __videobuf_copy_to_user(q, q->read_buf, data, count, nonblocking);
-	if (retval < 0)
-		goto done;
-
-	q->read_off += retval;
-	if (q->read_off == q->read_buf->size) {
-		/* all data copied, cleanup */
-		q->ops->buf_release(q, q->read_buf);
-		kfree(q->read_buf);
-		q->read_buf = NULL;
-	}
-
-done:
-	videobuf_queue_unlock(q);
-	return retval;
-}
-EXPORT_SYMBOL_GPL(videobuf_read_one);
-
-/* Locking: Caller holds q->vb_lock */
-static int __videobuf_read_start(struct videobuf_queue *q)
-{
-	enum v4l2_field field;
-	unsigned long flags = 0;
-	unsigned int count = 0, size = 0;
-	int err, i;
-
-	q->ops->buf_setup(q, &count, &size);
-	if (count < 2)
-		count = 2;
-	if (count > VIDEO_MAX_FRAME)
-		count = VIDEO_MAX_FRAME;
-	size = PAGE_ALIGN(size);
-
-	err = __videobuf_mmap_setup(q, count, size, V4L2_MEMORY_USERPTR);
-	if (err < 0)
-		return err;
-
-	count = err;
-
-	for (i = 0; i < count; i++) {
-		field = videobuf_next_field(q);
-		err = q->ops->buf_prepare(q, q->bufs[i], field);
-		if (err)
-			return err;
-		list_add_tail(&q->bufs[i]->stream, &q->stream);
-	}
-	spin_lock_irqsave(q->irqlock, flags);
-	for (i = 0; i < count; i++)
-		q->ops->buf_queue(q, q->bufs[i]);
-	spin_unlock_irqrestore(q->irqlock, flags);
-	q->reading = 1;
-	return 0;
-}
-
-static void __videobuf_read_stop(struct videobuf_queue *q)
-{
-	int i;
-
-	videobuf_queue_cancel(q);
-	__videobuf_free(q);
-	INIT_LIST_HEAD(&q->stream);
-	for (i = 0; i < VIDEO_MAX_FRAME; i++) {
-		if (NULL == q->bufs[i])
-			continue;
-		kfree(q->bufs[i]);
-		q->bufs[i] = NULL;
-	}
-	q->read_buf = NULL;
-}
-
-int videobuf_read_start(struct videobuf_queue *q)
-{
-	int rc;
-
-	videobuf_queue_lock(q);
-	rc = __videobuf_read_start(q);
-	videobuf_queue_unlock(q);
-
-	return rc;
-}
-EXPORT_SYMBOL_GPL(videobuf_read_start);
-
-void videobuf_read_stop(struct videobuf_queue *q)
-{
-	videobuf_queue_lock(q);
-	__videobuf_read_stop(q);
-	videobuf_queue_unlock(q);
-}
-EXPORT_SYMBOL_GPL(videobuf_read_stop);
-
-void videobuf_stop(struct videobuf_queue *q)
-{
-	videobuf_queue_lock(q);
-
-	if (q->streaming)
-		__videobuf_streamoff(q);
-
-	if (q->reading)
-		__videobuf_read_stop(q);
-
-	videobuf_queue_unlock(q);
-}
-EXPORT_SYMBOL_GPL(videobuf_stop);
-
-ssize_t videobuf_read_stream(struct videobuf_queue *q,
-			     char __user *data, size_t count, loff_t *ppos,
-			     int vbihack, int nonblocking)
-{
-	int rc, retval;
-	unsigned long flags = 0;
-
-	MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
-
-	dprintk(2, "%s\n", __func__);
-	videobuf_queue_lock(q);
-	retval = -EBUSY;
-	if (q->streaming)
-		goto done;
-	if (!q->reading) {
-		retval = __videobuf_read_start(q);
-		if (retval < 0)
-			goto done;
-	}
-
-	retval = 0;
-	while (count > 0) {
-		/* get / wait for data */
-		if (NULL == q->read_buf) {
-			q->read_buf = list_entry(q->stream.next,
-						 struct videobuf_buffer,
-						 stream);
-			list_del(&q->read_buf->stream);
-			q->read_off = 0;
-		}
-		rc = videobuf_waiton(q, q->read_buf, nonblocking, 1);
-		if (rc < 0) {
-			if (0 == retval)
-				retval = rc;
-			break;
-		}
-
-		if (q->read_buf->state == VIDEOBUF_DONE) {
-			rc = __videobuf_copy_stream(q, q->read_buf, data + retval, count,
-					retval, vbihack, nonblocking);
-			if (rc < 0) {
-				retval = rc;
-				break;
-			}
-			retval      += rc;
-			count       -= rc;
-			q->read_off += rc;
-		} else {
-			/* some error */
-			q->read_off = q->read_buf->size;
-			if (0 == retval)
-				retval = -EIO;
-		}
-
-		/* requeue buffer when done with copying */
-		if (q->read_off == q->read_buf->size) {
-			list_add_tail(&q->read_buf->stream,
-				      &q->stream);
-			spin_lock_irqsave(q->irqlock, flags);
-			q->ops->buf_queue(q, q->read_buf);
-			spin_unlock_irqrestore(q->irqlock, flags);
-			q->read_buf = NULL;
-		}
-		if (retval < 0)
-			break;
-	}
-
-done:
-	videobuf_queue_unlock(q);
-	return retval;
-}
-EXPORT_SYMBOL_GPL(videobuf_read_stream);
-
-__poll_t videobuf_poll_stream(struct file *file,
-			      struct videobuf_queue *q,
-			      poll_table *wait)
-{
-	__poll_t req_events = poll_requested_events(wait);
-	struct videobuf_buffer *buf = NULL;
-	__poll_t rc = 0;
-
-	videobuf_queue_lock(q);
-	if (q->streaming) {
-		if (!list_empty(&q->stream))
-			buf = list_entry(q->stream.next,
-					 struct videobuf_buffer, stream);
-	} else if (req_events & (EPOLLIN | EPOLLRDNORM)) {
-		if (!q->reading)
-			__videobuf_read_start(q);
-		if (!q->reading) {
-			rc = EPOLLERR;
-		} else if (NULL == q->read_buf) {
-			q->read_buf = list_entry(q->stream.next,
-						 struct videobuf_buffer,
-						 stream);
-			list_del(&q->read_buf->stream);
-			q->read_off = 0;
-		}
-		buf = q->read_buf;
-	}
-	if (buf)
-		poll_wait(file, &buf->done, wait);
-	else
-		rc = EPOLLERR;
-
-	if (0 == rc) {
-		if (buf->state == VIDEOBUF_DONE ||
-		    buf->state == VIDEOBUF_ERROR) {
-			switch (q->type) {
-			case V4L2_BUF_TYPE_VIDEO_OUTPUT:
-			case V4L2_BUF_TYPE_VBI_OUTPUT:
-			case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
-			case V4L2_BUF_TYPE_SDR_OUTPUT:
-				rc = EPOLLOUT | EPOLLWRNORM;
-				break;
-			default:
-				rc = EPOLLIN | EPOLLRDNORM;
-				break;
-			}
-		}
-	}
-	videobuf_queue_unlock(q);
-	return rc;
-}
-EXPORT_SYMBOL_GPL(videobuf_poll_stream);
-
-int videobuf_mmap_mapper(struct videobuf_queue *q, struct vm_area_struct *vma)
-{
-	int rc = -EINVAL;
-	int i;
-
-	MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
-
-	if (!(vma->vm_flags & VM_WRITE) || !(vma->vm_flags & VM_SHARED)) {
-		dprintk(1, "mmap appl bug: PROT_WRITE and MAP_SHARED are required\n");
-		return -EINVAL;
-	}
-
-	videobuf_queue_lock(q);
-	for (i = 0; i < VIDEO_MAX_FRAME; i++) {
-		struct videobuf_buffer *buf = q->bufs[i];
-
-		if (buf && buf->memory == V4L2_MEMORY_MMAP &&
-				buf->boff == (vma->vm_pgoff << PAGE_SHIFT)) {
-			rc = CALL(q, mmap_mapper, q, buf, vma);
-			break;
-		}
-	}
-	videobuf_queue_unlock(q);
-
-	return rc;
-}
-EXPORT_SYMBOL_GPL(videobuf_mmap_mapper);