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Kernel/Audio: Simplify initialization sequence for drivers

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Instead of enumerating all available controllers and then ask each to
find its audio channels, we change the initialization sequence to match
what happens in the Networking subsystem and Graphics subsystem - we
essentially probe for a matching driver on a PCI device, create a device
instance, and immediately initialize it.

This in fact allows us to immediately find any hardware initialization
issues and report it, and then dropping the created instance, as usually
being done in other initialization paths in the Kernel.

This also opens the opportunity to propagate errors when failed to
initialize an AudioChannel instance, and it will be addressed in a
future commit.
This commit is contained in:
Liav A 2023-04-11 12:45:31 +03:00 • committed by Linus Groh
parent 0050358cd3
commit 4921561687
7 changed files with 77 additions and 72 deletions
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23
Kernel/Devices/Audio/AC97.cpp
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@ -8,6 +8,7 @@
#include <Kernel/Arch/Delay.h>
#include <Kernel/Devices/Audio/AC97.h>
#include <Kernel/Devices/DeviceManagement.h>
#include <Kernel/IOWindow.h>
#include <Kernel/InterruptDisabler.h>
#include <Kernel/Memory/AnonymousVMObject.h>
@ -22,7 +23,7 @@ static constexpr u16 pcm_fixed_sample_rate = 48000;
static constexpr u16 pcm_sample_rate_minimum = 8000;
static constexpr u16 pcm_sample_rate_maximum = 48000;
UNMAP_AFTER_INIT ErrorOr<NonnullLockRefPtr<AC97>> AC97::try_create(PCI::DeviceIdentifier const& pci_device_identifier)
UNMAP_AFTER_INIT ErrorOr<NonnullRefPtr<AudioController>> AC97::create(PCI::DeviceIdentifier const& pci_device_identifier)
{
auto mixer_io_window = TRY(IOWindow::create_for_pci_device_bar(pci_device_identifier, PCI::HeaderType0BaseRegister::BAR0));
auto bus_io_window = TRY(IOWindow::create_for_pci_device_bar(pci_device_identifier, PCI::HeaderType0BaseRegister::BAR1));
@ -30,10 +31,13 @@ UNMAP_AFTER_INIT ErrorOr<NonnullLockRefPtr<AC97>> AC97::try_create(PCI::DeviceId
auto pcm_out_channel_io_window = TRY(bus_io_window->create_from_io_window_with_offset(NativeAudioBusChannel::PCMOutChannel));
auto pcm_out_channel = TRY(AC97Channel::create_with_parent_pci_device(pci_device_identifier.address(), "PCMOut"sv, move(pcm_out_channel_io_window)));
auto ac97 = adopt_nonnull_lock_ref_or_enomem(new (nothrow) AC97(pci_device_identifier, move(pcm_out_channel), move(mixer_io_window), move(bus_io_window)));
if (!ac97.is_error())
TRY(ac97.value()->initialize());
return ac97;
return TRY(adopt_nonnull_ref_or_enomem(new (nothrow) AC97(pci_device_identifier, move(pcm_out_channel), move(mixer_io_window), move(bus_io_window))));
}
UNMAP_AFTER_INIT ErrorOr<bool> AC97::probe(PCI::DeviceIdentifier const& device_identifier)
{
VERIFY(device_identifier.class_code().value() == to_underlying(PCI::ClassID::Multimedia));
return device_identifier.subclass_code().value() == to_underlying(PCI::Multimedia::SubclassID::AudioController);
}
UNMAP_AFTER_INIT AC97::AC97(PCI::DeviceIdentifier const& pci_device_identifier, NonnullOwnPtr<AC97Channel> pcm_out_channel, NonnullOwnPtr<IOWindow> mixer_io_window, NonnullOwnPtr<IOWindow> bus_io_window)
@ -79,11 +83,13 @@ bool AC97::handle_irq(RegisterState const&)
return true;
}
UNMAP_AFTER_INIT ErrorOr<void> AC97::initialize()
UNMAP_AFTER_INIT ErrorOr<void> AC97::initialize(Badge<AudioManagement>)
{
dbgln_if(AC97_DEBUG, "AC97 @ {}: mixer base: {:#04x}", device_identifier().address(), m_mixer_io_window);
dbgln_if(AC97_DEBUG, "AC97 @ {}: bus base: {:#04x}", device_identifier().address(), m_bus_io_window);
m_audio_channel = AudioChannel::must_create(*this, 0);
// Read out AC'97 codec revision and vendor
auto extended_audio_id = m_mixer_io_window->read16(NativeAudioMixerRegister::ExtendedAudioID);
m_codec_revision = static_cast<AC97Revision>(((extended_audio_id & ExtendedAudioMask::Revision) >> 10) & 0b11);
@ -178,11 +184,6 @@ LockRefPtr<AudioChannel> AC97::audio_channel(u32 index) const
return {};
}
void AC97::detect_hardware_audio_channels(Badge<AudioManagement>)
{
m_audio_channel = AudioChannel::must_create(*this, 0);
}
ErrorOr<void> AC97::set_pcm_output_sample_rate(size_t channel_index, u32 samples_per_second_rate)
{
if (channel_index != 0)