NAME
DEV_MODULE —
device driver module declaration
macro
SYNOPSIS
#include
<sys/module.h>
#include <sys/conf.h>
DEV_MODULE(name,
modeventhand_t evh,
void *arg);
DESCRIPTION
TheDEV_MODULE()
macro declares a device driver kernel module. It fills in a
moduledata_t structure and then calls
DECLARE_MODULE()
with the correct args, where name is the name of the
module and evh (with its argument
arg) is the event handler for the module (refer to
DECLARE_MODULE(9) for more information). The event handler is
supposed to create the device with
make_dev()
on load and to destroy it when it is unloaded using
destroy_dev().
EXAMPLES
#include <sys/module.h>
#include <sys/conf.h>
static struct dev_ops foo_ops = { ... };
static cdev_t sdev;
static int
foo_load(module_t mod, int cmd, void *arg)
{
int err = 0;
dev_ops_add(&foo_ops, ...);
switch (cmd) {
case MOD_LOAD:
sdev = make_dev(&foo_ops, 0, UID_ROOT, GID_WHEEL, 0600, "foo");
/* We must obtain a reference to sdev, so we can destroy it later */
reference_dev(sdev);
break; /* Success*/
case MOD_UNLOAD:
case MOD_SHUTDOWN:
destroy_dev(sdev);
/* The same mask and match must be specified, as in dev_ops_add() */
dev_ops_remove(&foo_ops, ...);
break; /* Success*/
default:
err = EINVAL;
break;
}
return(err);
}
DEV_MODULE(foo, foo_load, NULL);
SEE ALSO
AUTHORS
This manual page was written by Alexander Langer <alex@FreeBSD.org>.