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video1394: add poll file operation support 

This patch adds support for the poll file operation to the video1394
driver.

Signed-off-by: David Moore <dcm@acm.org>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
This commit is contained in:
David Moore 2006-08-02 01:00:00 +02:00 committed by Stefan Richter
parent a1b3206b36
commit 4b60912e52
1 changed files with 37 additions and 1 deletions
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38
drivers/ieee1394/video1394.c
View File

@ -1181,7 +1181,8 @@ static int video1394_mmap(struct file *file, struct vm_area_struct *vma)
lock_kernel();
if (ctx->current_ctx == NULL) {
PRINT(KERN_ERR, ctx->ohci->host->id, "Current iso context not set");
PRINT(KERN_ERR, ctx->ohci->host->id,
"Current iso context not set");
} else
res = dma_region_mmap(&ctx->current_ctx->dma, file, vma);
unlock_kernel();
@ -1189,6 +1190,40 @@ static int video1394_mmap(struct file *file, struct vm_area_struct *vma)
return res;
}
static unsigned int video1394_poll(struct file *file, poll_table *pt)
{
struct file_ctx *ctx;
unsigned int mask = 0;
unsigned long flags;
struct dma_iso_ctx *d;
int i;
lock_kernel();
ctx = file->private_data;
d = ctx->current_ctx;
if (d == NULL) {
PRINT(KERN_ERR, ctx->ohci->host->id,
"Current iso context not set");
mask = POLLERR;
goto done;
}
poll_wait(file, &d->waitq, pt);
spin_lock_irqsave(&d->lock, flags);
for (i = 0; i < d->num_desc; i++) {
if (d->buffer_status[i] == VIDEO1394_BUFFER_READY) {
mask |= POLLIN | POLLRDNORM;
break;
}
}
spin_unlock_irqrestore(&d->lock, flags);
done:
unlock_kernel();
return mask;
}
static int video1394_open(struct inode *inode, struct file *file)
{
int i = ieee1394_file_to_instance(file);
@ -1257,6 +1292,7 @@ static struct file_operations video1394_fops=
#ifdef CONFIG_COMPAT
.compat_ioctl = video1394_compat_ioctl,
#endif
.poll = video1394_poll,
.mmap = video1394_mmap,
.open = video1394_open,
.release = video1394_release