MOST Synchronous Driver (non-realtime)

Files
file	most-sync-common.h
	Common functionality between real-time and non-real-time synchronous driver.
file	most-sync-m.c
	Implementation of the MOST Synchronous driver.
file	most-sync.h
	Declarations for the MOST Synchronous driver.

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Detailed Description

This kernel module provides access to synchronous data. For a detailed description see the Diploma Thesis.

Accessing the Data

Although the module was written to access the synchronous data from userspace, it was changed later (for the ALSA) module so that it's also possible to access the data from kernelspace.

This was done in following way:

• To open and close the file, flip_open() and filp_close() can be used. The device name is still /dev/mostsync#.
• To do ioctl(), read() and write() it's not possible to use the userspace calls because the data resides in userspace. So the functions most_sync_read(), and most_sync_write(), most_sync_setup_rx() and most_sync_setup_tx() were exported which form the base implementation of the system calls and can be used from kernelspace.

It's not very clean but implementation was fast and the sound driver was a feature that was added shortly before the end of the thesis.

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