NetBSD/sys/kern/subr_device.c

182 lines
3.8 KiB
C

/* $NetBSD: subr_device.c,v 1.3 2015/03/09 15:35:11 pooka Exp $ */
/*
* Copyright (c) 2006 The NetBSD Foundation, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: subr_device.c,v 1.3 2015/03/09 15:35:11 pooka Exp $");
#include <sys/param.h>
#include <sys/device.h>
#include <sys/systm.h>
/* Root device. */
device_t root_device;
/*
* Accessor functions for the device_t type.
*/
devclass_t
device_class(device_t dev)
{
return dev->dv_class;
}
cfdata_t
device_cfdata(device_t dev)
{
return dev->dv_cfdata;
}
cfdriver_t
device_cfdriver(device_t dev)
{
return dev->dv_cfdriver;
}
cfattach_t
device_cfattach(device_t dev)
{
return dev->dv_cfattach;
}
int
device_unit(device_t dev)
{
return dev->dv_unit;
}
const char *
device_xname(device_t dev)
{
return dev->dv_xname;
}
device_t
device_parent(device_t dev)
{
return dev->dv_parent;
}
bool
device_activation(device_t dev, devact_level_t level)
{
int active_flags;
active_flags = DVF_ACTIVE;
switch (level) {
case DEVACT_LEVEL_FULL:
active_flags |= DVF_CLASS_SUSPENDED;
/*FALLTHROUGH*/
case DEVACT_LEVEL_DRIVER:
active_flags |= DVF_DRIVER_SUSPENDED;
/*FALLTHROUGH*/
case DEVACT_LEVEL_BUS:
active_flags |= DVF_BUS_SUSPENDED;
break;
}
return (dev->dv_flags & active_flags) == DVF_ACTIVE;
}
bool
device_is_active(device_t dev)
{
int active_flags;
active_flags = DVF_ACTIVE;
active_flags |= DVF_CLASS_SUSPENDED;
active_flags |= DVF_DRIVER_SUSPENDED;
active_flags |= DVF_BUS_SUSPENDED;
return (dev->dv_flags & active_flags) == DVF_ACTIVE;
}
bool
device_is_enabled(device_t dev)
{
return (dev->dv_flags & DVF_ACTIVE) == DVF_ACTIVE;
}
bool
device_has_power(device_t dev)
{
int active_flags;
active_flags = DVF_ACTIVE | DVF_BUS_SUSPENDED;
return (dev->dv_flags & active_flags) == DVF_ACTIVE;
}
int
device_locator(device_t dev, u_int locnum)
{
KASSERT(dev->dv_locators != NULL);
return dev->dv_locators[locnum];
}
void *
device_private(device_t dev)
{
/*
* The reason why device_private(NULL) is allowed is to simplify the
* work of a lot of userspace request handlers (i.e., c/bdev
* handlers) which grab cfdriver_t->cd_units[n].
* It avoids having them test for it to be NULL and only then calling
* device_private.
*/
return dev == NULL ? NULL : dev->dv_private;
}
prop_dictionary_t
device_properties(device_t dev)
{
return dev->dv_properties;
}
/*
* device_is_a:
*
* Returns true if the device is an instance of the specified
* driver.
*/
bool
device_is_a(device_t dev, const char *dname)
{
return strcmp(dev->dv_cfdriver->cd_name, dname) == 0;
}