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The intial comment usually doesn't contain much information.
As in the C sources you need to include a placeholder define for the copyright notice. To avoid getting multiple define warnings for the COPYING macro the header files should use macro name like COPYING2..COPYING9.
This file is part of Open Sound System.
Copyright (C) 4Front Technologies 1996-2008.
This this source file is released under GPL v2 license (no other versions). See the COPYING file included in the main directory of this source distribution for the license terms and conditions.
Each device instance should have a per-device data structure that contains variables common to all sub-devices of the card. By convenntion this structure is called devc. Driver designers may use different terminology. However use of devc is highly recomended in all OSS drivers because it will make maintenance of the code easier.
typedef struct _myossdev_devc_t *myoss_devc_t;
struct _myossdev_devc_t
{
oss_device_t *osdev; /* A handle to the device given by the OSS core. */
oss_mutex_t *mutex; /* A lock/mutex variable for the device */
};