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Kernel: Make AC'97 initialization fallible

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Let's not crash in `AudioManagement` if we run into trouble.
This commit is contained in:
Jelle Raaijmakers 2022-02-27 15:46:11 +01:00 • committed by Andreas Kling
parent feb00b7105
commit 9a46573ffc
3 changed files with 18 additions and 9 deletions
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13
Kernel/Devices/Audio/AC97.cpp
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2021, Jelle Raaijmakers <jelle@gmta.nl>
* Copyright (c) 2021-2022, Jelle Raaijmakers <jelle@gmta.nl>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -21,7 +21,10 @@ static constexpr u16 pcm_sample_rate_maximum = 48000;
UNMAP_AFTER_INIT ErrorOr<NonnullRefPtr<AC97>> AC97::try_create(PCI::DeviceIdentifier const& pci_device_identifier)
{
return adopt_nonnull_ref_or_enomem(new (nothrow) AC97(pci_device_identifier));
auto ac97 = adopt_nonnull_ref_or_enomem(new (nothrow) AC97(pci_device_identifier));
if (!ac97.is_error())
TRY(ac97.value()->initialize());
return ac97;
}
UNMAP_AFTER_INIT AC97::AC97(PCI::DeviceIdentifier const& pci_device_identifier)
@ -31,7 +34,6 @@ UNMAP_AFTER_INIT AC97::AC97(PCI::DeviceIdentifier const& pci_device_identifier)
, m_io_bus_base(PCI::get_BAR1(pci_address()) & ~1)
, m_pcm_out_channel(channel("PCMOut"sv, NativeAudioBusChannel::PCMOutChannel))
{
initialize();
}
UNMAP_AFTER_INIT AC97::~AC97()
@ -68,7 +70,7 @@ bool AC97::handle_irq(RegisterState const&)
return true;
}
UNMAP_AFTER_INIT void AC97::initialize()
UNMAP_AFTER_INIT ErrorOr<void> AC97::initialize()
{
dbgln_if(AC97_DEBUG, "AC97 @ {}: mixer base: {:#04x}", pci_address(), m_io_mixer_base.get());
dbgln_if(AC97_DEBUG, "AC97 @ {}: bus base: {:#04x}", pci_address(), m_io_bus_base.get());
@ -103,7 +105,7 @@ UNMAP_AFTER_INIT void AC97::initialize()
}
extended_audio_status_control_register.out(extended_audio_status);
MUST(set_pcm_output_sample_rate(m_variable_rate_pcm_supported ? pcm_default_sample_rate : pcm_fixed_sample_rate));
TRY(set_pcm_output_sample_rate(m_variable_rate_pcm_supported ? pcm_default_sample_rate : pcm_fixed_sample_rate));
// Left and right volume of 0 means attenuation of 0 dB
set_master_output_volume(0, 0, Muted::No);
@ -111,6 +113,7 @@ UNMAP_AFTER_INIT void AC97::initialize()
reset_pcm_out();
enable_irq();
return {};
}
void AC97::reset_pcm_out()