| 1 | /* $NetBSD: subr_device.c,v 1.3 2015/03/09 15:35:11 pooka Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (c) 2006 The NetBSD Foundation, Inc. |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * Redistribution and use in source and binary forms, with or without |
| 8 | * modification, are permitted provided that the following conditions |
| 9 | * are met: |
| 10 | * 1. Redistributions of source code must retain the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer. |
| 12 | * 2. Redistributions in binary form must reproduce the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer in the |
| 14 | * documentation and/or other materials provided with the distribution. |
| 15 | * |
| 16 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
| 17 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| 18 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 19 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
| 20 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 21 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 22 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 23 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 24 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 25 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 26 | * POSSIBILITY OF SUCH DAMAGE. |
| 27 | */ |
| 28 | |
| 29 | #include <sys/cdefs.h> |
| 30 | __KERNEL_RCSID(0, "$NetBSD: subr_device.c,v 1.3 2015/03/09 15:35:11 pooka Exp $" ); |
| 31 | |
| 32 | #include <sys/param.h> |
| 33 | #include <sys/device.h> |
| 34 | #include <sys/systm.h> |
| 35 | |
| 36 | /* Root device. */ |
| 37 | device_t root_device; |
| 38 | |
| 39 | /* |
| 40 | * Accessor functions for the device_t type. |
| 41 | */ |
| 42 | devclass_t |
| 43 | device_class(device_t dev) |
| 44 | { |
| 45 | |
| 46 | return dev->dv_class; |
| 47 | } |
| 48 | |
| 49 | cfdata_t |
| 50 | device_cfdata(device_t dev) |
| 51 | { |
| 52 | |
| 53 | return dev->dv_cfdata; |
| 54 | } |
| 55 | |
| 56 | cfdriver_t |
| 57 | device_cfdriver(device_t dev) |
| 58 | { |
| 59 | |
| 60 | return dev->dv_cfdriver; |
| 61 | } |
| 62 | |
| 63 | cfattach_t |
| 64 | device_cfattach(device_t dev) |
| 65 | { |
| 66 | |
| 67 | return dev->dv_cfattach; |
| 68 | } |
| 69 | |
| 70 | int |
| 71 | device_unit(device_t dev) |
| 72 | { |
| 73 | |
| 74 | return dev->dv_unit; |
| 75 | } |
| 76 | |
| 77 | const char * |
| 78 | device_xname(device_t dev) |
| 79 | { |
| 80 | |
| 81 | return dev->dv_xname; |
| 82 | } |
| 83 | |
| 84 | device_t |
| 85 | device_parent(device_t dev) |
| 86 | { |
| 87 | |
| 88 | return dev->dv_parent; |
| 89 | } |
| 90 | |
| 91 | bool |
| 92 | device_activation(device_t dev, devact_level_t level) |
| 93 | { |
| 94 | int active_flags; |
| 95 | |
| 96 | active_flags = DVF_ACTIVE; |
| 97 | switch (level) { |
| 98 | case DEVACT_LEVEL_FULL: |
| 99 | active_flags |= DVF_CLASS_SUSPENDED; |
| 100 | /*FALLTHROUGH*/ |
| 101 | case DEVACT_LEVEL_DRIVER: |
| 102 | active_flags |= DVF_DRIVER_SUSPENDED; |
| 103 | /*FALLTHROUGH*/ |
| 104 | case DEVACT_LEVEL_BUS: |
| 105 | active_flags |= DVF_BUS_SUSPENDED; |
| 106 | break; |
| 107 | } |
| 108 | |
| 109 | return (dev->dv_flags & active_flags) == DVF_ACTIVE; |
| 110 | } |
| 111 | |
| 112 | bool |
| 113 | device_is_active(device_t dev) |
| 114 | { |
| 115 | int active_flags; |
| 116 | |
| 117 | active_flags = DVF_ACTIVE; |
| 118 | active_flags |= DVF_CLASS_SUSPENDED; |
| 119 | active_flags |= DVF_DRIVER_SUSPENDED; |
| 120 | active_flags |= DVF_BUS_SUSPENDED; |
| 121 | |
| 122 | return (dev->dv_flags & active_flags) == DVF_ACTIVE; |
| 123 | } |
| 124 | |
| 125 | bool |
| 126 | device_is_enabled(device_t dev) |
| 127 | { |
| 128 | return (dev->dv_flags & DVF_ACTIVE) == DVF_ACTIVE; |
| 129 | } |
| 130 | |
| 131 | bool |
| 132 | device_has_power(device_t dev) |
| 133 | { |
| 134 | int active_flags; |
| 135 | |
| 136 | active_flags = DVF_ACTIVE | DVF_BUS_SUSPENDED; |
| 137 | |
| 138 | return (dev->dv_flags & active_flags) == DVF_ACTIVE; |
| 139 | } |
| 140 | |
| 141 | int |
| 142 | device_locator(device_t dev, u_int locnum) |
| 143 | { |
| 144 | |
| 145 | KASSERT(dev->dv_locators != NULL); |
| 146 | return dev->dv_locators[locnum]; |
| 147 | } |
| 148 | |
| 149 | void * |
| 150 | device_private(device_t dev) |
| 151 | { |
| 152 | |
| 153 | /* |
| 154 | * The reason why device_private(NULL) is allowed is to simplify the |
| 155 | * work of a lot of userspace request handlers (i.e., c/bdev |
| 156 | * handlers) which grab cfdriver_t->cd_units[n]. |
| 157 | * It avoids having them test for it to be NULL and only then calling |
| 158 | * device_private. |
| 159 | */ |
| 160 | return dev == NULL ? NULL : dev->dv_private; |
| 161 | } |
| 162 | |
| 163 | prop_dictionary_t |
| 164 | device_properties(device_t dev) |
| 165 | { |
| 166 | |
| 167 | return dev->dv_properties; |
| 168 | } |
| 169 | |
| 170 | /* |
| 171 | * device_is_a: |
| 172 | * |
| 173 | * Returns true if the device is an instance of the specified |
| 174 | * driver. |
| 175 | */ |
| 176 | bool |
| 177 | device_is_a(device_t dev, const char *dname) |
| 178 | { |
| 179 | |
| 180 | return strcmp(dev->dv_cfdriver->cd_name, dname) == 0; |
| 181 | } |
| 182 | |