179 lines
3.8 KiB
C
179 lines
3.8 KiB
C
/* $NetBSD: subr_device.c,v 1.2 2010/01/31 15:10:12 pooka Exp $ */
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/*
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* Copyright (c) 2006 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: subr_device.c,v 1.2 2010/01/31 15:10:12 pooka Exp $");
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#include <sys/param.h>
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#include <sys/device.h>
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#include <sys/systm.h>
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/*
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* Accessor functions for the device_t type.
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*/
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devclass_t
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device_class(device_t dev)
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{
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return dev->dv_class;
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}
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cfdata_t
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device_cfdata(device_t dev)
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{
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return dev->dv_cfdata;
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}
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cfdriver_t
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device_cfdriver(device_t dev)
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{
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return dev->dv_cfdriver;
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}
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cfattach_t
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device_cfattach(device_t dev)
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{
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return dev->dv_cfattach;
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}
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int
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device_unit(device_t dev)
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{
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return dev->dv_unit;
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}
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const char *
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device_xname(device_t dev)
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{
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return dev->dv_xname;
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}
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device_t
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device_parent(device_t dev)
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{
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return dev->dv_parent;
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}
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bool
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device_activation(device_t dev, devact_level_t level)
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{
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int active_flags;
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active_flags = DVF_ACTIVE;
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switch (level) {
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case DEVACT_LEVEL_FULL:
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active_flags |= DVF_CLASS_SUSPENDED;
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/*FALLTHROUGH*/
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case DEVACT_LEVEL_DRIVER:
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active_flags |= DVF_DRIVER_SUSPENDED;
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/*FALLTHROUGH*/
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case DEVACT_LEVEL_BUS:
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active_flags |= DVF_BUS_SUSPENDED;
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break;
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}
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return (dev->dv_flags & active_flags) == DVF_ACTIVE;
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}
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bool
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device_is_active(device_t dev)
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{
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int active_flags;
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active_flags = DVF_ACTIVE;
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active_flags |= DVF_CLASS_SUSPENDED;
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active_flags |= DVF_DRIVER_SUSPENDED;
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active_flags |= DVF_BUS_SUSPENDED;
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return (dev->dv_flags & active_flags) == DVF_ACTIVE;
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}
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bool
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device_is_enabled(device_t dev)
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{
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return (dev->dv_flags & DVF_ACTIVE) == DVF_ACTIVE;
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}
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bool
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device_has_power(device_t dev)
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{
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int active_flags;
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active_flags = DVF_ACTIVE | DVF_BUS_SUSPENDED;
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return (dev->dv_flags & active_flags) == DVF_ACTIVE;
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}
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int
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device_locator(device_t dev, u_int locnum)
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{
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KASSERT(dev->dv_locators != NULL);
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return dev->dv_locators[locnum];
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}
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void *
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device_private(device_t dev)
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{
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/*
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* The reason why device_private(NULL) is allowed is to simplify the
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* work of a lot of userspace request handlers (i.e., c/bdev
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* handlers) which grab cfdriver_t->cd_units[n].
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* It avoids having them test for it to be NULL and only then calling
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* device_private.
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*/
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return dev == NULL ? NULL : dev->dv_private;
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}
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prop_dictionary_t
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device_properties(device_t dev)
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{
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return dev->dv_properties;
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}
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/*
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* device_is_a:
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*
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* Returns true if the device is an instance of the specified
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* driver.
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*/
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bool
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device_is_a(device_t dev, const char *dname)
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{
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return strcmp(dev->dv_cfdriver->cd_name, dname) == 0;
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}
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