Driver management services

Collaboration diagram for Driver management services:

Functions
int	a4l_register_drv (a4l_drv_t *drv)
	Register an Analogy driver.
int	a4l_unregister_drv (a4l_drv_t *drv)
	Unregister an Analogy driver.

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Detailed Description

Analogy driver registration / unregistration

In a common Linux char driver, the developer has to register a fops structure filled with callbacks for read / write / mmap / ioctl operations.

Analogy drivers do not have to implement read / write / mmap / ioctl functions, these procedures are implemented in the Analogy generic layer. Then, the transfers between user-space and kernel-space are already managed. Analogy drivers work with commands and instructions which are some kind of more dedicated read / write operations. And, instead of registering a fops structure, a Analogy driver must register some a4l_driver structure.

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Function Documentation

int a4l_register_drv

(

a4l_drv_t *

drv

)

Register an Analogy driver.

After initialising a driver structure, the driver must be made available so as to be attached.

Parameters:

[in]

drv

Driver descriptor structure

Returns:

0 on success, otherwise negative error code.

int a4l_unregister_drv

(

a4l_drv_t *

drv

)

Unregister an Analogy driver.

This function removes the driver descriptor from the Analogy driver list. The driver cannot be attached anymore.

Parameters:

[in]

drv

Driver descriptor structure

Returns:

0 on success, otherwise negative error code.