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Serenity Operating System
1/*
2 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice, this
9 * list of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation
13 * and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
22 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <Kernel/Devices/Device.h>
28#include <Kernel/FileSystem/InodeMetadata.h>
29#include <LibC/errno_numbers.h>
30
31namespace Kernel {
32
33static HashMap<u32, Device*>* s_all_devices;
34
35HashMap<u32, Device*>& Device::all_devices()
36{
37 if (s_all_devices == nullptr)
38 s_all_devices = new HashMap<u32, Device*>;
39 return *s_all_devices;
40}
41
42void Device::for_each(Function<void(Device&)> callback)
43{
44 for (auto& entry : all_devices())
45 callback(*entry.value);
46}
47
48Device* Device::get_device(unsigned major, unsigned minor)
49{
50 auto it = all_devices().find(encoded_device(major, minor));
51 if (it == all_devices().end())
52 return nullptr;
53 return it->value;
54}
55
56Device::Device(unsigned major, unsigned minor)
57 : m_major(major)
58 , m_minor(minor)
59{
60 u32 device_id = encoded_device(major, minor);
61 auto it = all_devices().find(device_id);
62 if (it != all_devices().end()) {
63 dbg() << "Already registered " << major << "," << minor << ": " << it->value->class_name();
64 }
65 ASSERT(!all_devices().contains(device_id));
66 all_devices().set(device_id, this);
67}
68
69Device::~Device()
70{
71 all_devices().remove(encoded_device(m_major, m_minor));
72}
73
74String Device::absolute_path() const
75{
76 return String::format("device:%u,%u (%s)", m_major, m_minor, class_name());
77}
78
79String Device::absolute_path(const FileDescription&) const
80{
81 return absolute_path();
82}
83
84}