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>
diff --git a/drivers/ieee1394/video1394.c b/drivers/ieee1394/video1394.c
index 6b5353d..af78b84 100644
--- a/drivers/ieee1394/video1394.c
+++ b/drivers/ieee1394/video1394.c
@@ -1181,7 +1181,8 @@
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 @@
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 @@
#ifdef CONFIG_COMPAT
.compat_ioctl = video1394_compat_ioctl,
#endif
+ .poll = video1394_poll,
.mmap = video1394_mmap,
.open = video1394_open,
.release = video1394_release