NTSTATUS DDKAPI dispatch(DEVICE_OBJECT *device_object, IRP *irp)
{
libusb_device_t *dev = device_object->DeviceExtension;
IO_STACK_LOCATION *stack_location = IoGetCurrentIrpStackLocation(irp);
switch (stack_location->MajorFunction)
{
case IRP_MJ_PNP:
return dispatch_pnp(dev, irp);
case IRP_MJ_POWER:
// ID: 2960644 (farthen)
// You can't set the power state if the device is not handled at all
if(!dev->next_stack_device)
{
return complete_irp(irp, STATUS_INVALID_DEVICE_STATE, 0);
}
return dispatch_power(dev, irp);
}
/* since this driver may run as an upper filter we have to check whether */
/* the IRP is sent to this device object or to the lower one */
if (accept_irp(dev, irp))
{
switch (stack_location->MajorFunction)
{
case IRP_MJ_DEVICE_CONTROL:
if (dev->is_started)
{
return dispatch_ioctl(dev, irp);
}
else /* not started yet */
{
return complete_irp(irp, STATUS_INVALID_DEVICE_STATE, 0);
}
case IRP_MJ_CREATE:
if (dev->is_started)
{
// only one driver can act as power policy owner and
// power_set_device_state() can only be issued by the PPO.
// disallow_power_control is set to true for drivers which
// we know cause a BSOD on any attempt to request power irps.
if (dev->power_state.DeviceState != PowerDeviceD0 && !dev->disallow_power_control)
{
/* power up the device, block until the call */
/* completes */
power_set_device_state(dev, PowerDeviceD0, TRUE);
}
return complete_irp(irp, STATUS_SUCCESS, 0);
}
else /* not started yet */
{
return complete_irp(irp, STATUS_INVALID_DEVICE_STATE, 0);
}
case IRP_MJ_CLOSE:
/* release all interfaces bound to this file object */
release_all_interfaces(dev, stack_location->FileObject);
return complete_irp(irp, STATUS_SUCCESS, 0);
case IRP_MJ_CLEANUP:
return complete_irp(irp, STATUS_SUCCESS, 0);
default:
return complete_irp(irp, STATUS_NOT_SUPPORTED, 0);
}
}
else /* the IRP is for the lower device object */
{
return pass_irp_down(dev, irp, NULL, NULL);
}
}
NTSTATUS DDKAPI dispatch(DEVICE_OBJECT *device_object, IRP *irp)
{
libusb_device_t *dev = device_object->DeviceExtension;
switch(IoGetCurrentIrpStackLocation(irp)->MajorFunction)
{
case IRP_MJ_PNP:
return dispatch_pnp(dev, irp);
case IRP_MJ_POWER:
return dispatch_power(dev, irp);
}
/* since this driver may run as an upper filter we have to check whether */
/* the IRP is sent to this device object or to the lower one */
if(accept_irp(dev, irp))
{
switch(IoGetCurrentIrpStackLocation(irp)->MajorFunction)
{
case IRP_MJ_DEVICE_CONTROL:
if(dev->is_started)
{
return dispatch_ioctl(dev, irp);
}
else /* not started yet */
{
return complete_irp(irp, STATUS_INVALID_DEVICE_STATE, 0);
}
case IRP_MJ_CREATE:
if(dev->is_started)
{
if(InterlockedIncrement(&dev->ref_count) == 1)
{
if(dev->power_state.DeviceState != PowerDeviceD0)
{
/* power up the device, block until the call */
/* completes */
power_set_device_state(dev, PowerDeviceD0, TRUE);
}
}
return complete_irp(irp, STATUS_SUCCESS, 0);
}
else /* not started yet */
{
return complete_irp(irp, STATUS_INVALID_DEVICE_STATE, 0);
}
case IRP_MJ_CLOSE:
if(!InterlockedDecrement(&dev->ref_count))
{
/* release all interfaces when the last handle is closed */
release_all_interfaces(dev);
}
return complete_irp(irp, STATUS_SUCCESS, 0);
case IRP_MJ_CLEANUP:
return complete_irp(irp, STATUS_SUCCESS, 0);
default:
return complete_irp(irp, STATUS_NOT_SUPPORTED, 0);
}
}
else /* the IRP is for the lower device object */
{
return pass_irp_down(dev, irp, NULL, NULL);
}
}