static unsigned int dma_buf_lock_handle_poll(struct file *file,
struct poll_table_struct *wait)
{
dma_buf_lock_resource *resource;
unsigned int ret = 0;
if (!is_dma_buf_lock_file(file))
return POLLERR;
resource = file->private_data;
#if DMA_BUF_LOCK_DEBUG
printk("dma_buf_lock_handle_poll\n");
#endif
if (1 == atomic_read(&resource->locked))
{
/* Resources have been locked */
ret = POLLIN | POLLRDNORM;
if (resource->exclusive)
{
ret |= POLLOUT | POLLWRNORM;
}
}
else
{
if (!poll_does_not_wait(wait))
{
poll_wait(file, &resource->wait, wait);
}
}
#if DMA_BUF_LOCK_DEBUG
printk("dma_buf_lock_handle_poll : return %i\n", ret);
#endif
return ret;
}
static unsigned int sync_file_poll(struct file *file, poll_table *wait)
{
struct sync_file *sync_file = file->private_data;
poll_wait(file, &sync_file->wq, wait);
if (!poll_does_not_wait(wait) &&
!test_and_set_bit(POLL_ENABLED, &sync_file->fence->flags)) {
if (fence_add_callback(sync_file->fence, &sync_file->cb,
fence_check_cb_func) < 0)
wake_up_all(&sync_file->wq);
}
return fence_is_signaled(sync_file->fence) ? POLLIN : 0;
}
static unsigned int audiostub_poll(struct file *filp, poll_table *wait)
{
unsigned int mask = 0;
if (filp->private_data != (void *)AUDIO_PCM_OFFSET)
return 0;
if ((filp->f_flags & O_ACCMODE) == O_RDONLY) {
poll_wait(filp, &pcm_rxwq, wait);
if (!skb_queue_empty(&pcm_rxq))
mask |= POLLIN | POLLRDNORM;
} else if ((filp->f_flags & O_ACCMODE) == O_WRONLY) {
poll_wait(filp, &pcm_txwq, wait);
/* make sure a packet has been sent before poll returns */
if (poll_does_not_wait(wait)
&& skb_queue_len(&pcm_txq) < MAX_AUDIO_PACKET_NUM) {
mask |= POLLOUT | POLLWRNORM;
}
}
return mask;
}
