diff options
Diffstat (limited to 'drivers/ieee1394/video1394.c')
| -rw-r--r-- | drivers/ieee1394/video1394.c | 38 |
1 files changed, 37 insertions, 1 deletions
diff --git a/drivers/ieee1394/video1394.c b/drivers/ieee1394/video1394.c index 6b5353d81ae2..af78b840dc26 100644 --- a/drivers/ieee1394/video1394.c +++ b/drivers/ieee1394/video1394.c @@ -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 |
