static int io = -1;
+#endif
MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("A driver for an imaginary radio card.");
-MODULE_PARM(io, "i");
+module_param(io, int, 0444);
MODULE_PARM_DESC(io, "I/O address of the card.");
-int init_module(void)
+static int __init init(void)
{
if(io==-1)
{
return myradio_init(NULL);
}
-void cleanup_module(void)
+static void __exit cleanup(void)
{
video_unregister_device(&my_radio);
release_region(io, MY_IO_SIZE);
}
-#endif
+module_init(init);
+module_exit(cleanup);
</programlisting>
<para>
In this example we set the IO base by default if the driver is compiled into
- the kernel where you cannot pass a parameter. For the module we require the
+ the kernel: you can still set it using "my_radio.irq" if this file is called <filename>my_radio.c</filename>. For the module we require the
user sets the parameter. We set io to a nonsense port (-1) so that we can
tell if the user supplied an io parameter or not.
</para>
<para>
We use MODULE_ defines to give an author for the card driver and a
description. We also use them to declare that io is an integer and it is the
- address of the card.
+ address of the card, and can be read by anyone from sysfs.
</para>
<para>
The clean-up routine unregisters the video_device we registered, and frees