subr_device.c revision 1.2.22.1
1 1.2 pooka /* $NetBSD: subr_device.c,v 1.2.22.1 2017/12/03 11:38:45 jdolecek Exp $ */ 2 1.2 pooka 3 1.2 pooka /* 4 1.2 pooka * Copyright (c) 2006 The NetBSD Foundation, Inc. 5 1.2 pooka * All rights reserved. 6 1.2 pooka * 7 1.2 pooka * Redistribution and use in source and binary forms, with or without 8 1.2 pooka * modification, are permitted provided that the following conditions 9 1.2 pooka * are met: 10 1.2 pooka * 1. Redistributions of source code must retain the above copyright 11 1.2 pooka * notice, this list of conditions and the following disclaimer. 12 1.2 pooka * 2. Redistributions in binary form must reproduce the above copyright 13 1.2 pooka * notice, this list of conditions and the following disclaimer in the 14 1.2 pooka * documentation and/or other materials provided with the distribution. 15 1.2 pooka * 16 1.2 pooka * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 1.2 pooka * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 1.2 pooka * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 1.2 pooka * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 1.2 pooka * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 1.2 pooka * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 1.2 pooka * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 1.2 pooka * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 1.2 pooka * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 1.2 pooka * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 1.2 pooka * POSSIBILITY OF SUCH DAMAGE. 27 1.2 pooka */ 28 1.2 pooka 29 1.2 pooka #include <sys/cdefs.h> 30 1.2.22.1 jdolecek __KERNEL_RCSID(0, "$NetBSD: subr_device.c,v 1.2.22.1 2017/12/03 11:38:45 jdolecek Exp $"); 31 1.2 pooka 32 1.2 pooka #include <sys/param.h> 33 1.2 pooka #include <sys/device.h> 34 1.2 pooka #include <sys/systm.h> 35 1.2 pooka 36 1.2.22.1 jdolecek /* Root device. */ 37 1.2.22.1 jdolecek device_t root_device; 38 1.2.22.1 jdolecek 39 1.2 pooka /* 40 1.2 pooka * Accessor functions for the device_t type. 41 1.2 pooka */ 42 1.2 pooka devclass_t 43 1.2 pooka device_class(device_t dev) 44 1.2 pooka { 45 1.2 pooka 46 1.2 pooka return dev->dv_class; 47 1.2 pooka } 48 1.2 pooka 49 1.2 pooka cfdata_t 50 1.2 pooka device_cfdata(device_t dev) 51 1.2 pooka { 52 1.2 pooka 53 1.2 pooka return dev->dv_cfdata; 54 1.2 pooka } 55 1.2 pooka 56 1.2 pooka cfdriver_t 57 1.2 pooka device_cfdriver(device_t dev) 58 1.2 pooka { 59 1.2 pooka 60 1.2 pooka return dev->dv_cfdriver; 61 1.2 pooka } 62 1.2 pooka 63 1.2 pooka cfattach_t 64 1.2 pooka device_cfattach(device_t dev) 65 1.2 pooka { 66 1.2 pooka 67 1.2 pooka return dev->dv_cfattach; 68 1.2 pooka } 69 1.2 pooka 70 1.2 pooka int 71 1.2 pooka device_unit(device_t dev) 72 1.2 pooka { 73 1.2 pooka 74 1.2 pooka return dev->dv_unit; 75 1.2 pooka } 76 1.2 pooka 77 1.2 pooka const char * 78 1.2 pooka device_xname(device_t dev) 79 1.2 pooka { 80 1.2 pooka 81 1.2 pooka return dev->dv_xname; 82 1.2 pooka } 83 1.2 pooka 84 1.2 pooka device_t 85 1.2 pooka device_parent(device_t dev) 86 1.2 pooka { 87 1.2 pooka 88 1.2 pooka return dev->dv_parent; 89 1.2 pooka } 90 1.2 pooka 91 1.2 pooka bool 92 1.2 pooka device_activation(device_t dev, devact_level_t level) 93 1.2 pooka { 94 1.2 pooka int active_flags; 95 1.2 pooka 96 1.2 pooka active_flags = DVF_ACTIVE; 97 1.2 pooka switch (level) { 98 1.2 pooka case DEVACT_LEVEL_FULL: 99 1.2 pooka active_flags |= DVF_CLASS_SUSPENDED; 100 1.2 pooka /*FALLTHROUGH*/ 101 1.2 pooka case DEVACT_LEVEL_DRIVER: 102 1.2 pooka active_flags |= DVF_DRIVER_SUSPENDED; 103 1.2 pooka /*FALLTHROUGH*/ 104 1.2 pooka case DEVACT_LEVEL_BUS: 105 1.2 pooka active_flags |= DVF_BUS_SUSPENDED; 106 1.2 pooka break; 107 1.2 pooka } 108 1.2 pooka 109 1.2 pooka return (dev->dv_flags & active_flags) == DVF_ACTIVE; 110 1.2 pooka } 111 1.2 pooka 112 1.2 pooka bool 113 1.2 pooka device_is_active(device_t dev) 114 1.2 pooka { 115 1.2 pooka int active_flags; 116 1.2 pooka 117 1.2 pooka active_flags = DVF_ACTIVE; 118 1.2 pooka active_flags |= DVF_CLASS_SUSPENDED; 119 1.2 pooka active_flags |= DVF_DRIVER_SUSPENDED; 120 1.2 pooka active_flags |= DVF_BUS_SUSPENDED; 121 1.2 pooka 122 1.2 pooka return (dev->dv_flags & active_flags) == DVF_ACTIVE; 123 1.2 pooka } 124 1.2 pooka 125 1.2 pooka bool 126 1.2 pooka device_is_enabled(device_t dev) 127 1.2 pooka { 128 1.2 pooka return (dev->dv_flags & DVF_ACTIVE) == DVF_ACTIVE; 129 1.2 pooka } 130 1.2 pooka 131 1.2 pooka bool 132 1.2 pooka device_has_power(device_t dev) 133 1.2 pooka { 134 1.2 pooka int active_flags; 135 1.2 pooka 136 1.2 pooka active_flags = DVF_ACTIVE | DVF_BUS_SUSPENDED; 137 1.2 pooka 138 1.2 pooka return (dev->dv_flags & active_flags) == DVF_ACTIVE; 139 1.2 pooka } 140 1.2 pooka 141 1.2 pooka int 142 1.2 pooka device_locator(device_t dev, u_int locnum) 143 1.2 pooka { 144 1.2 pooka 145 1.2 pooka KASSERT(dev->dv_locators != NULL); 146 1.2 pooka return dev->dv_locators[locnum]; 147 1.2 pooka } 148 1.2 pooka 149 1.2 pooka void * 150 1.2 pooka device_private(device_t dev) 151 1.2 pooka { 152 1.2 pooka 153 1.2 pooka /* 154 1.2 pooka * The reason why device_private(NULL) is allowed is to simplify the 155 1.2 pooka * work of a lot of userspace request handlers (i.e., c/bdev 156 1.2 pooka * handlers) which grab cfdriver_t->cd_units[n]. 157 1.2 pooka * It avoids having them test for it to be NULL and only then calling 158 1.2 pooka * device_private. 159 1.2 pooka */ 160 1.2 pooka return dev == NULL ? NULL : dev->dv_private; 161 1.2 pooka } 162 1.2 pooka 163 1.2 pooka prop_dictionary_t 164 1.2 pooka device_properties(device_t dev) 165 1.2 pooka { 166 1.2 pooka 167 1.2 pooka return dev->dv_properties; 168 1.2 pooka } 169 1.2 pooka 170 1.2 pooka /* 171 1.2 pooka * device_is_a: 172 1.2 pooka * 173 1.2 pooka * Returns true if the device is an instance of the specified 174 1.2 pooka * driver. 175 1.2 pooka */ 176 1.2 pooka bool 177 1.2 pooka device_is_a(device_t dev, const char *dname) 178 1.2 pooka { 179 1.2 pooka 180 1.2 pooka return strcmp(dev->dv_cfdriver->cd_name, dname) == 0; 181 1.2 pooka } 182
Indexes created Tue Sep 30 07:10:03 GMT 2025