Commit 4b60912e authored by David Moore's avatar David Moore Committed by Stefan Richter
Browse files

video1394: add poll file operation support 



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

Signed-off-by: default avatarDavid Moore <dcm@acm.org>
Signed-off-by: default avatarStefan Richter <stefanr@s5r6.in-berlin.de>
parent a1b3206b

drivers/ieee1394/video1394.c

+37 −1
Original line number Diff line number Diff line
@@ -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