return sprintf(buf, "%i\n", vdev->index);
}
+static ssize_t show_debug(struct device *cd,
+ struct device_attribute *attr, char *buf)
+{
+ struct video_device *vdev = to_video_device(cd);
+
+ return sprintf(buf, "%i\n", vdev->debug);
+}
+
+static ssize_t set_debug(struct device *cd, struct device_attribute *attr,
+ const char *buf, size_t len)
+{
+ struct video_device *vdev = to_video_device(cd);
+ int res = 0;
+ u16 value;
+
+ res = kstrtou16(buf, 0, &value);
+ if (res)
+ return res;
+
+ vdev->debug = value;
+ return len;
+}
+
static ssize_t show_name(struct device *cd,
struct device_attribute *attr, char *buf)
{
static struct device_attribute video_device_attrs[] = {
__ATTR(name, S_IRUGO, show_name, NULL),
+ __ATTR(debug, 0644, show_debug, set_debug),
__ATTR(index, S_IRUGO, show_index, NULL),
__ATTR_NULL
};
ret = vdev->fops->read(filp, buf, sz, off);
if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags))
mutex_unlock(vdev->lock);
+ if (vdev->debug)
+ printk(KERN_DEBUG "%s: read: %zd (%d)\n",
+ video_device_node_name(vdev), sz, ret);
return ret;
}
ret = vdev->fops->write(filp, buf, sz, off);
if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags))
mutex_unlock(vdev->lock);
+ if (vdev->debug)
+ printk(KERN_DEBUG "%s: write: %zd (%d)\n",
+ video_device_node_name(vdev), sz, ret);
return ret;
}
ret = vdev->fops->poll(filp, poll);
if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags))
mutex_unlock(vdev->lock);
+ if (vdev->debug)
+ printk(KERN_DEBUG "%s: poll: %08x\n",
+ video_device_node_name(vdev), ret);
return ret;
}
int ret = -ENODEV;
if (vdev->fops->unlocked_ioctl) {
- bool locked = false;
+ struct mutex *lock = v4l2_ioctl_get_lock(vdev, cmd);
- if (vdev->lock) {
- /* always lock unless the cmd is marked as "don't use lock" */
- locked = !v4l2_is_known_ioctl(cmd) ||
- !test_bit(_IOC_NR(cmd), vdev->disable_locking);
-
- if (locked && mutex_lock_interruptible(vdev->lock))
- return -ERESTARTSYS;
- }
+ if (lock && mutex_lock_interruptible(lock))
+ return -ERESTARTSYS;
if (video_is_registered(vdev))
ret = vdev->fops->unlocked_ioctl(filp, cmd, arg);
- if (locked)
- mutex_unlock(vdev->lock);
+ if (lock)
+ mutex_unlock(lock);
} else if (vdev->fops->ioctl) {
/* This code path is a replacement for the BKL. It is a major
* hack but it will have to do for those drivers that are not
unsigned long flags)
{
struct video_device *vdev = video_devdata(filp);
+ int ret;
if (!vdev->fops->get_unmapped_area)
return -ENOSYS;
if (!video_is_registered(vdev))
return -ENODEV;
- return vdev->fops->get_unmapped_area(filp, addr, len, pgoff, flags);
+ ret = vdev->fops->get_unmapped_area(filp, addr, len, pgoff, flags);
+ if (vdev->debug)
+ printk(KERN_DEBUG "%s: get_unmapped_area (%d)\n",
+ video_device_node_name(vdev), ret);
+ return ret;
}
#endif
ret = vdev->fops->mmap(filp, vm);
if (test_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags))
mutex_unlock(vdev->lock);
+ if (vdev->debug)
+ printk(KERN_DEBUG "%s: mmap (%d)\n",
+ video_device_node_name(vdev), ret);
return ret;
}
/* decrease the refcount in case of an error */
if (ret)
video_put(vdev);
+ if (vdev->debug)
+ printk(KERN_DEBUG "%s: open (%d)\n",
+ video_device_node_name(vdev), ret);
return ret;
}
/* decrease the refcount unconditionally since the release()
return value is ignored. */
video_put(vdev);
+ if (vdev->debug)
+ printk(KERN_DEBUG "%s: release\n",
+ video_device_node_name(vdev));
return ret;
}