V4L/DVB (6251): Replace video-buf to a more generic approach (7a7d9a89) · Commits · e / devices / android_kernel_teracube_2e

drivers/media/video/videobuf-core.c

0 → 100644

+976 −0

Original line number	Diff line number	Diff line
		/*
		* 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/slab.h>
		#include <linux/interrupt.h>

		#include <media/videobuf-core.h>

		#define MAGIC_BUFFER 0x20070728
		#define MAGIC_CHECK(is,should) if (unlikely((is) != (should))) \
		{ printk(KERN_ERR "magic mismatch: %x (expected %x)\n",is,should); BUG(); }

		static int debug = 0;
		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...) if (debug >= level) \
		printk(KERN_DEBUG "vbuf: " fmt , ## arg)

		/* --------------------------------------------------------------------- */

		#define CALL(q, f, arg...) \
		( (q->int_ops->f)? q->int_ops->f(arg) : 0)

		void* videobuf_alloc(struct videobuf_queue* q)
		{
		struct videobuf_buffer *vb;

		BUG_ON (q->msize<sizeof(*vb));

		if (!q->int_ops \|\| !q->int_ops->alloc) {
		printk(KERN_ERR "No specific ops defined!\n");
		BUG();
		}

		vb = q->int_ops->alloc(q->msize);

		if (NULL != vb) {
		init_waitqueue_head(&vb->done);
		vb->magic = MAGIC_BUFFER;
		}

		return vb;
		}

		int videobuf_waiton(struct videobuf_buffer *vb, int non_blocking, int intr)
		{
		int retval = 0;
		DECLARE_WAITQUEUE(wait, current);

		MAGIC_CHECK(vb->magic,MAGIC_BUFFER);
		add_wait_queue(&vb->done, &wait);
		while (vb->state == STATE_ACTIVE \|\| vb->state == STATE_QUEUED) {
		if (non_blocking) {
		retval = -EAGAIN;
		break;
		}
		set_current_state(intr ? TASK_INTERRUPTIBLE
		: TASK_UNINTERRUPTIBLE);
		if (vb->state == STATE_ACTIVE \|\| vb->state == STATE_QUEUED)
		schedule();
		set_current_state(TASK_RUNNING);
		if (intr && signal_pending(current)) {
		dprintk(1,"buffer waiton: -EINTR\n");
		retval = -EINTR;
		break;
		}
		}
		remove_wait_queue(&vb->done, &wait);
		return retval;
		}

		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);
		}

		/* --------------------------------------------------------------------- */


		void videobuf_queue_init(struct videobuf_queue* q,
		struct videobuf_queue_ops *ops,
		void *dev,
		spinlock_t *irqlock,
		enum v4l2_buf_type type,
		enum v4l2_field field,
		unsigned int msize,
		void *priv)
		{
		memset(q,0,sizeof(*q));
		q->irqlock = irqlock;
		q->dev = dev;
		q->type = type;
		q->field = field;
		q->msize = msize;
		q->ops = ops;
		q->priv_data = priv;

		/* 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);

		mutex_init(&q->lock);
		INIT_LIST_HEAD(&q->stream);
		}

		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 (CALL(q,is_mmapped,q->bufs[i])) {
		dprintk(1,"busy: buffer #%d mapped\n",i);
		return 1;
		}
		if (q->bufs[i]->state == STATE_QUEUED) {
		dprintk(1,"busy: buffer #%d queued\n",i);
		return 1;
		}
		if (q->bufs[i]->state == STATE_ACTIVE) {
		dprintk(1,"busy: buffer #%d avtive\n",i);
		return 1;
		}
		}
		return 0;
		}

		void videobuf_queue_cancel(struct videobuf_queue *q)
		{
		unsigned long flags=0;
		int i;

		/* remove queued buffers from list */
		if (q->irqlock)
		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 == STATE_QUEUED) {
		list_del(&q->bufs[i]->queue);
		q->bufs[i]->state = STATE_ERROR;
		}
		}
		if (q->irqlock)
		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);
		}

		/* --------------------------------------------------------------------- */

		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;
		}

		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 (CALL(q,is_mmapped,vb))
		b->flags \|= V4L2_BUF_FLAG_MAPPED;

		switch (vb->state) {
		case STATE_PREPARED:
		case STATE_QUEUED:
		case STATE_ACTIVE:
		b->flags \|= V4L2_BUF_FLAG_QUEUED;
		break;
		case STATE_DONE:
		case STATE_ERROR:
		b->flags \|= V4L2_BUF_FLAG_DONE;
		break;
		case STATE_NEEDS_INIT:
		case STATE_IDLE:
		/* nothing */
		break;
		}

		if (vb->input != UNSET) {
		b->flags \|= V4L2_BUF_FLAG_INPUT;
		b->input = vb->input;
		}

		b->field = vb->field;
		b->timestamp = vb->ts;
		b->bytesused = vb->size;
		b->sequence = vb->field_count >> 1;
		}

		int videobuf_reqbufs(struct videobuf_queue *q,
		struct v4l2_requestbuffers *req)
		{
		unsigned int size,count;
		int retval;

		if (req->type != q->type) {
		dprintk(1,"reqbufs: queue type invalid\n");
		return -EINVAL;
		}
		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;
		}

		if (q->streaming) {
		dprintk(1,"reqbufs: streaming already exists\n");
		return -EBUSY;
		}
		if (!list_empty(&q->stream)) {
		dprintk(1,"reqbufs: stream running\n");
		return -EBUSY;
		}

		mutex_lock(&q->lock);
		count = req->count;
		if (count > VIDEO_MAX_FRAME)
		count = VIDEO_MAX_FRAME;
		size = 0;
		q->ops->buf_setup(q,&count,&size);
		size = PAGE_ALIGN(size);
		dprintk(1,"reqbufs: bufs=%d, size=0x%x [%d pages total]\n",
		count, size, (count*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 = count;

		done:
		mutex_unlock(&q->lock);
		return retval;
		}

		int videobuf_querybuf(struct videobuf_queue q, struct v4l2_buffer b)
		{
		if (unlikely(b->type != q->type)) {
		dprintk(1,"querybuf: Wrong type.\n");
		return -EINVAL;
		}
		if (unlikely(b->index < 0 \|\| b->index >= VIDEO_MAX_FRAME)) {
		dprintk(1,"querybuf: index out of range.\n");
		return -EINVAL;
		}
		if (unlikely(NULL == q->bufs[b->index])) {
		dprintk(1,"querybuf: buffer is null.\n");
		return -EINVAL;
		}
		videobuf_status(q,b,q->bufs[b->index],q->type);
		return 0;
		}

		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);

		mutex_lock(&q->lock);
		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 < 0 \|\| 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 != STATE_NEEDS_INIT && buf->state != STATE_IDLE) {
		dprintk(1,"qbuf: buffer is already queued or active.\n");
		goto done;
		}

		if (b->flags & V4L2_BUF_FLAG_INPUT) {
		if (b->input >= q->inputs) {
		dprintk(1,"qbuf: wrong input.\n");
		goto done;
		}
		buf->input = b->input;
		} else {
		buf->input = UNSET;
		}

		switch (b->memory) {
		case V4L2_MEMORY_MMAP:
		if (0 == buf->baddr) {
		dprintk(1,"qbuf: mmap requested but buffer addr is zero!\n");
		goto done;
		}
		break;
		case V4L2_MEMORY_USERPTR:
		if (b->length < buf->bsize) {
		dprintk(1,"qbuf: buffer length is not enough\n");
		goto done;
		}
		if (STATE_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) {
		if (q->irqlock)
		spin_lock_irqsave(q->irqlock,flags);
		q->ops->buf_queue(q,buf);
		if (q->irqlock)
		spin_unlock_irqrestore(q->irqlock,flags);
		}
		dprintk(1,"qbuf: succeded\n");
		retval = 0;

		done:
		mutex_unlock(&q->lock);
		return retval;
		}

		int videobuf_dqbuf(struct videobuf_queue *q,
		struct v4l2_buffer *b, int nonblocking)
		{
		struct videobuf_buffer *buf;
		int retval;

		MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);

		mutex_lock(&q->lock);
		retval = -EBUSY;
		if (q->reading) {
		dprintk(1,"dqbuf: Reading running...\n");
		goto done;
		}
		retval = -EINVAL;
		if (b->type != q->type) {
		dprintk(1,"dqbuf: Wrong type.\n");
		goto done;
		}
		if (list_empty(&q->stream)) {
		dprintk(1,"dqbuf: stream running\n");
		goto done;
		}
		buf = list_entry(q->stream.next, struct videobuf_buffer, stream);
		retval = videobuf_waiton(buf, nonblocking, 1);
		if (retval < 0) {
		dprintk(1,"dqbuf: waiton returned %d\n",retval);
		goto done;
		}
		switch (buf->state) {
		case STATE_ERROR:
		dprintk(1,"dqbuf: state is error\n");
		retval = -EIO;
		CALL(q,sync,q, buf);
		buf->state = STATE_IDLE;
		break;
		case STATE_DONE:
		dprintk(1,"dqbuf: state is done\n");
		CALL(q,sync,q, buf);
		buf->state = STATE_IDLE;
		break;
		default:
		dprintk(1,"dqbuf: state invalid\n");
		retval = -EINVAL;
		goto done;
		}
		list_del(&buf->stream);
		memset(b,0,sizeof(*b));
		videobuf_status(q,b,buf,q->type);

		done:
		mutex_unlock(&q->lock);
		return retval;
		}

		int videobuf_streamon(struct videobuf_queue *q)
		{
		struct videobuf_buffer *buf;
		struct list_head *list;
		unsigned long flags=0;
		int retval;

		mutex_lock(&q->lock);
		retval = -EBUSY;
		if (q->reading)
		goto done;
		retval = 0;
		if (q->streaming)
		goto done;
		q->streaming = 1;
		if (q->irqlock)
		spin_lock_irqsave(q->irqlock,flags);
		list_for_each(list,&q->stream) {
		buf = list_entry(list, struct videobuf_buffer, stream);
		if (buf->state == STATE_PREPARED)
		q->ops->buf_queue(q,buf);
		}
		if (q->irqlock)
		spin_unlock_irqrestore(q->irqlock,flags);

		done:
		mutex_unlock(&q->lock);
		return retval;
		}

		int videobuf_streamoff(struct videobuf_queue *q)
		{
		int retval = -EINVAL;

		mutex_lock(&q->lock);
		if (!q->streaming)
		goto done;
		videobuf_queue_cancel(q);
		q->streaming = 0;
		retval = 0;

		done:
		mutex_unlock(&q->lock);
		return retval;
		}

		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(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 */
		if (q->irqlock)
		spin_lock_irqsave(q->irqlock,flags);
		q->ops->buf_queue(q,q->read_buf);
		if (q->irqlock)
		spin_unlock_irqrestore(q->irqlock,flags);
		retval = videobuf_waiton(q->read_buf,0,0);
		if (0 == retval) {
		CALL(q,sync,q,q->read_buf);
		if (STATE_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;
		}

		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, nbufs;
		int retval;

		MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);

		mutex_lock(&q->lock);

		nbufs = 1; size = 0;
		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(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;
		}
		if (q->irqlock)
		spin_lock_irqsave(q->irqlock,flags);

		q->ops->buf_queue(q,q->read_buf);
		if (q->irqlock)
		spin_unlock_irqrestore(q->irqlock,flags);
		q->read_off = 0;
		}

		/* wait until capture is done */
		retval = videobuf_waiton(q->read_buf, nonblocking, 1);
		if (0 != retval)
		goto done;

		CALL(q,sync,q,q->read_buf);

		if (STATE_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=CALL(q,copy_to_user,q,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:
		mutex_unlock(&q->lock);
		return retval;
		}

		int videobuf_read_start(struct videobuf_queue *q)
		{
		enum v4l2_field field;
		unsigned long flags=0;
		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)
		return 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);
		}
		if (q->irqlock)
		spin_lock_irqsave(q->irqlock,flags);
		for (i = 0; i < count; i++)
		q->ops->buf_queue(q,q->bufs[i]);
		if (q->irqlock)
		spin_unlock_irqrestore(q->irqlock,flags);
		q->reading = 1;
		return 0;
		}

		void videobuf_read_stop(struct videobuf_queue *q)
		{
		int i;

		videobuf_queue_cancel(q);
		videobuf_mmap_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;
		q->reading = 0;
		}

		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",__FUNCTION__);
		mutex_lock(&q->lock);
		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->read_buf, nonblocking, 1);
		if (rc < 0) {
		if (0 == retval)
		retval = rc;
		break;
		}

		if (q->read_buf->state == STATE_DONE) {
		rc = CALL (q,copy_stream, q, data, 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);
		if (q->irqlock)
		spin_lock_irqsave(q->irqlock,flags);
		q->ops->buf_queue(q,q->read_buf);
		if (q->irqlock)
		spin_unlock_irqrestore(q->irqlock,flags);
		q->read_buf = NULL;
		}
		if (retval < 0)
		break;
		}

		done:
		mutex_unlock(&q->lock);
		return retval;
		}

		unsigned int videobuf_poll_stream(struct file *file,
		struct videobuf_queue *q,
		poll_table *wait)
		{
		struct videobuf_buffer *buf = NULL;
		unsigned int rc = 0;

		mutex_lock(&q->lock);
		if (q->streaming) {
		if (!list_empty(&q->stream))
		buf = list_entry(q->stream.next,
		struct videobuf_buffer, stream);
		} else {
		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 == STATE_DONE \|\|
		buf->state == STATE_ERROR)
		rc = POLLIN\|POLLRDNORM;
		}
		mutex_unlock(&q->lock);
		return rc;
		}

		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_mmap_free(q);
		if (0 != err)
		return err;

		/* Allocate and initialize buffers */
		for (i = 0; i < bcount; i++) {
		q->bufs[i] = videobuf_alloc(q);

		q->bufs[i]->i = i;
		q->bufs[i]->input = UNSET;
		q->bufs[i]->memory = memory;
		q->bufs[i]->bsize = bsize;
		switch (memory) {
		case V4L2_MEMORY_MMAP:
		q->bufs[i]->boff = bsize * i;
		break;
		case V4L2_MEMORY_USERPTR:
		case V4L2_MEMORY_OVERLAY:
		/* nothing */
		break;
		}
		}

		dprintk(1,"mmap setup: %d buffers, %d bytes each\n",
		bcount,bsize);

		return 0;
		}

		int videobuf_mmap_free(struct videobuf_queue *q)
		{
		int i;
		int rc;

		MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);

		rc = CALL(q,mmap_free,q);
		if (rc<0)
		return rc;

		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 rc;
		}

		int videobuf_mmap_mapper(struct videobuf_queue *q,
		struct vm_area_struct *vma)
		{
		int retval;

		MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);

		mutex_lock(&q->lock);
		retval=CALL(q,mmap_mapper,q,vma);
		mutex_unlock(&q->lock);

		return retval;
		}

		#ifdef CONFIG_VIDEO_V4L1_COMPAT
		int videobuf_cgmbuf(struct videobuf_queue *q,
		struct video_mbuf *mbuf, int count)
		{
		struct v4l2_requestbuffers req;
		int rc,i;

		MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);

		memset(&req,0,sizeof(req));
		req.type = q->type;
		req.count = count;
		req.memory = V4L2_MEMORY_MMAP;
		rc = videobuf_reqbufs(q,&req);
		if (rc < 0)
		return rc;

		mbuf->frames = req.count;
		mbuf->size = 0;
		for (i = 0; i < mbuf->frames; i++) {
		mbuf->offsets[i] = q->bufs[i]->boff;
		mbuf->size += q->bufs[i]->bsize;
		}

		return 0;
		}
		#endif

		/* --------------------------------------------------------------------- */

		EXPORT_SYMBOL_GPL(videobuf_waiton);
		EXPORT_SYMBOL_GPL(videobuf_iolock);

		EXPORT_SYMBOL_GPL(videobuf_alloc);

		EXPORT_SYMBOL_GPL(videobuf_queue_init);
		EXPORT_SYMBOL_GPL(videobuf_queue_cancel);
		EXPORT_SYMBOL_GPL(videobuf_queue_is_busy);

		EXPORT_SYMBOL_GPL(videobuf_next_field);
		EXPORT_SYMBOL_GPL(videobuf_reqbufs);
		EXPORT_SYMBOL_GPL(videobuf_querybuf);
		EXPORT_SYMBOL_GPL(videobuf_qbuf);
		EXPORT_SYMBOL_GPL(videobuf_dqbuf);
		EXPORT_SYMBOL_GPL(videobuf_cgmbuf);
		EXPORT_SYMBOL_GPL(videobuf_streamon);
		EXPORT_SYMBOL_GPL(videobuf_streamoff);

		EXPORT_SYMBOL_GPL(videobuf_read_start);
		EXPORT_SYMBOL_GPL(videobuf_read_stop);
		EXPORT_SYMBOL_GPL(videobuf_read_stream);
		EXPORT_SYMBOL_GPL(videobuf_read_one);
		EXPORT_SYMBOL_GPL(videobuf_poll_stream);

		EXPORT_SYMBOL_GPL(videobuf_mmap_setup);
		EXPORT_SYMBOL_GPL(videobuf_mmap_free);
		EXPORT_SYMBOL_GPL(videobuf_mmap_mapper);

		/*
		* Local variables:
		* c-basic-offset: 8
		* End:
		*/

drivers/media/video/videobuf-dma-sg.c

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include/media/videobuf-core.h

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include/media/videobuf-dma-sg.h

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