/* 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;
}
/* Locking: Caller holds q->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(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,video_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_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(¤t->mm->mmap_sem);
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);
if (b->memory == V4L2_MEMORY_MMAP)
up_read(¤t->mm->mmap_sem);
return retval;
}
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(¤t->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
|| q->type == V4L2_BUF_TYPE_SDR_OUTPUT) {
buf->size = b->bytesused;
buf->field = b->field;
buf->ts = v4l2_timeval_to_ns(&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(¤t->mm->mmap_sem);
return retval;
}