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 | |