mirror of
https://github.com/SerenityOS/serenity
synced 2024-10-07 16:40:59 +00:00
3fb289e27d
Instead, hold the lock while we copy the contents to a stack-based Vector then iterate on it without any locking. Because we rely on heap allocations, we need to propagate errors back in case of OOM condition, therefore, both PCI::enumerate API function and PCI::Access::add_host_controller_and_enumerate_attached_devices use now a ErrorOr<void> return value to propagate errors. OOM Error can only occur when enumerating the m_device_identifiers vector under a spinlock and trying to expand the temporary Vector which will be used locklessly to actually iterate over the PCI::DeviceIdentifiers objects.
86 lines
2.5 KiB
C++
86 lines
2.5 KiB
C++
/*
|
|
* Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#include <AK/Singleton.h>
|
|
#include <Kernel/Bus/PCI/API.h>
|
|
#include <Kernel/Bus/PCI/IDs.h>
|
|
#include <Kernel/Devices/Audio/AC97.h>
|
|
#include <Kernel/Devices/Audio/Management.h>
|
|
#include <Kernel/Sections.h>
|
|
|
|
namespace Kernel {
|
|
|
|
static Singleton<AudioManagement> s_the;
|
|
static Atomic<u32> s_device_minor_number;
|
|
|
|
MajorNumber AudioManagement::audio_type_major_number()
|
|
{
|
|
return 116;
|
|
}
|
|
MinorNumber AudioManagement::generate_storage_minor_number()
|
|
{
|
|
auto minor_number = s_device_minor_number.load();
|
|
s_device_minor_number++;
|
|
return minor_number;
|
|
}
|
|
|
|
AudioManagement& AudioManagement::the()
|
|
{
|
|
return *s_the;
|
|
}
|
|
|
|
UNMAP_AFTER_INIT AudioManagement::AudioManagement()
|
|
{
|
|
}
|
|
|
|
UNMAP_AFTER_INIT void AudioManagement::enumerate_hardware_controllers()
|
|
{
|
|
if (!PCI::Access::is_disabled()) {
|
|
MUST(PCI::enumerate([&](PCI::DeviceIdentifier const& device_identifier) {
|
|
// Note: Only consider PCI audio controllers
|
|
if (device_identifier.class_code().value() != to_underlying(PCI::ClassID::Multimedia)
|
|
|| device_identifier.subclass_code().value() != to_underlying(PCI::Multimedia::SubclassID::AudioController))
|
|
return;
|
|
|
|
dbgln("AC97: found audio controller at {}", device_identifier.address());
|
|
auto ac97_device = AC97::try_create(device_identifier);
|
|
if (ac97_device.is_error()) {
|
|
// FIXME: Propagate errors properly
|
|
dbgln("AudioManagement: failed to initialize AC97 device: {}", ac97_device.error());
|
|
return;
|
|
}
|
|
m_controllers_list.append(ac97_device.release_value());
|
|
}));
|
|
}
|
|
}
|
|
|
|
UNMAP_AFTER_INIT void AudioManagement::enumerate_hardware_audio_channels()
|
|
{
|
|
for (auto& controller : m_controllers_list)
|
|
controller.detect_hardware_audio_channels({});
|
|
}
|
|
|
|
UNMAP_AFTER_INIT bool AudioManagement::initialize()
|
|
{
|
|
|
|
/* Explanation on the flow:
|
|
* 1. Enumerate all audio controllers connected to the system:
|
|
* a. Try to find the SB16 ISA-based controller.
|
|
* b. Enumerate the PCI bus and try to find audio controllers there too
|
|
* 2. Ask each controller to detect the audio channels and instantiate AudioChannel objects.
|
|
*/
|
|
enumerate_hardware_controllers();
|
|
enumerate_hardware_audio_channels();
|
|
|
|
if (m_controllers_list.is_empty()) {
|
|
dbgln("No audio controller was initialized.");
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
}
|