[media] v4l: move v4l2 core into a separate directory

Currently, the v4l2 core is mixed together with other non-core drivers.
Move them into a separate directory.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 0 insertions, 1189 deletions

diff --git a/drivers/media/video/videobuf-core.c b/drivers/media/video/videobuf-core.c
deleted file mode 100644
index bf7a326b1cdc..000000000000
--- a/drivers/media/video/videobuf-core.c
+++ /dev/null
@@ -1,1189 +0,0 @@
-/*
- * generic helper functions for handling video4linux capture buffers
- *
- * (c) 2007 Mauro Carvalho Chehab, <mchehab@infradead.org>
- *
- * Highly based on video-buf written originally by:
- * (c) 2001,02 Gerd Knorr <kraxel@bytesex.org>
- * (c) 2006 Mauro Carvalho Chehab, <mchehab@infradead.org>
- * (c) 2006 Ted Walther and John Sokol
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2
- */
-
-#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>
-
-#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@infradead.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)
-
-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 is_state_active_or_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 (is_state_active_or_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, is_state_active_or_queued(q, vb));
-	else
-		wait_event(vb->done, is_state_active_or_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 avtive\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;
-	}
-
-	b->flags    = 0;
-	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;
-		/* fall through */
-	case VIDEOBUF_DONE:
-		b->flags |= V4L2_BUF_FLAG_DONE;
-		break;
-	case VIDEOBUF_NEEDS_INIT:
-	case VIDEOBUF_IDLE:
-		/* nothing */
-		break;
-	}
-
-	b->field     = vb->field;
-	b->timestamp = 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:
-			/* 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->count < 1) {
-		dprintk(1, "reqbufs: count invalid (%d)\n", req->count);
-		return -EINVAL;
-	}
-
-	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;
-	}
-
-	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)
-		down_read(&current->mm->mmap_sem);
-
-	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) {
-			buf->size = b->bytesused;
-			buf->field = b->field;
-			buf->ts = b->timestamp;
-		}
-		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)
-		up_read(&current->mm->mmap_sem);
-
-	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 = CALL(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 = CALL(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);
-
-unsigned int videobuf_poll_stream(struct file *file,
-				  struct videobuf_queue *q,
-				  poll_table *wait)
-{
-	unsigned long req_events = poll_requested_events(wait);
-	struct videobuf_buffer *buf = NULL;
-	unsigned int 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 & (POLLIN | POLLRDNORM)) {
-		if (!q->reading)
-			__videobuf_read_start(q);
-		if (!q->reading) {
-			rc = POLLERR;
-		} 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)
-		rc = POLLERR;
-
-	if (0 == rc) {
-		poll_wait(file, &buf->done, wait);
-		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:
-				rc = POLLOUT | POLLWRNORM;
-				break;
-			default:
-				rc = POLLIN | POLLRDNORM;
-				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);