linux-imx

static __poll_t phantom_poll(struct file *file, poll_table *wait)

{

    struct phantom_device *dev = file->private_data;

    __poll_t mask = 0;

​

    pr_debug("phantom_poll: %d\n", atomic_read(&dev->counter));

    poll_wait(file, &dev->wait, wait);

​

    if (!(dev->status & PHB_RUNNING))

    else if (atomic_read(&dev->counter))

​

    pr_debug("phantom_poll end: %x/%d\n", mask, atomic_read(&dev->counter));

​

    return mask;

}

​

static const struct file_operations phantom_file_ops = {

    .open = phantom_open,

    .release = phantom_release,

    .unlocked_ioctl = phantom_ioctl,