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Kernel: Implement volume control to audio drivers

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Bananymous
2026-04-02 15:14:27 +03:00
parent 85f61aded5
commit 5647cf24d2
9 changed files with 166 additions and 20 deletions
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92
kernel/kernel/Audio/HDAudio/AudioFunctionGroup.cpp
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@@ -136,6 +136,37 @@ namespace Kernel
return BAN::Error::from_errno(ENOTSUP);
}
BAN::ErrorOr<void> HDAudioFunctionGroup::set_volume_mdB(int32_t mdB)
{
mdB = BAN::Math::clamp(mdB, m_volume_info.min_mdB, m_volume_info.max_mdB);
const auto& path = m_output_paths[m_output_path_index];
for (size_t i = 0; i < path.size(); i++)
{
if (!path[i]->output_amplifier.has_value())
continue;
const int32_t step_round = (mdB >= 0)
? +m_volume_info.step_mdB / 2
: -m_volume_info.step_mdB / 2;
const uint32_t step = (mdB + step_round) / m_volume_info.step_mdB + path[i]->output_amplifier->offset;
const uint32_t volume = 0b1'0'1'1'0000'0'0000000 | step;
TRY(m_controller->send_command({
.data = static_cast<uint8_t>(volume & 0xFF),
.command = static_cast<uint16_t>(0x300 | (volume >> 8)),
.node_index = path[i]->id,
.codec_address = m_cid,
}));
break;
}
m_volume_info.mdB = mdB;
return {};
}
size_t HDAudioFunctionGroup::bdl_offset() const
{
const size_t bdl_entry_bytes = m_bdl_entry_sample_frames * get_channels() * sizeof(uint16_t);
@@ -291,13 +322,6 @@ namespace Kernel
return 0b0'0'000'000'0'001'0001;
}
uint16_t HDAudioFunctionGroup::get_volume_data() const
{
// TODO: don't hardcode this
// left and right output, no mute, max gain
return 0b1'0'1'1'0000'0'1111111;
}
BAN::ErrorOr<void> HDAudioFunctionGroup::enable_output_path(uint8_t index)
{
ASSERT(index < m_output_paths.size());
@@ -318,7 +342,6 @@ namespace Kernel
}
const auto format = get_format_data();
const auto volume = get_volume_data();
for (size_t i = 0; i < path.size(); i++)
{
@@ -347,13 +370,17 @@ namespace Kernel
}));
}
// set volume
TRY(m_controller->send_command({
.data = static_cast<uint8_t>(volume & 0xFF),
.command = static_cast<uint16_t>(0x300 | (volume >> 8)),
.node_index = path[i]->id,
.codec_address = m_cid,
}));
// set volume to 0 dB, no mute
if (path[i]->output_amplifier.has_value())
{
const uint32_t volume = 0b1'0'1'1'0000'0'0000000 | path[i]->output_amplifier->offset;
TRY(m_controller->send_command({
.data = static_cast<uint8_t>(volume & 0xFF),
.command = static_cast<uint16_t>(0x300 | (volume >> 8)),
.node_index = path[i]->id,
.codec_address = m_cid,
}));
}
switch (path[i]->type)
{
@@ -398,6 +425,41 @@ namespace Kernel
}
}
// update volume info to this path
m_volume_info.min_mdB = 0;
m_volume_info.max_mdB = 0;
m_volume_info.step_mdB = 0;
for (size_t i = 0; i < path.size(); i++)
{
if (!path[i]->output_amplifier.has_value())
continue;
const auto& amp = path[i]->output_amplifier.value();
const int32_t step_mdB = amp.step_size * 250;
m_volume_info.step_mdB = step_mdB;
m_volume_info.min_mdB = -amp.offset * step_mdB;
m_volume_info.max_mdB = (amp.num_steps - amp.offset) * step_mdB;
m_volume_info.mdB = BAN::Math::clamp(m_volume_info.mdB, m_volume_info.min_mdB, m_volume_info.max_mdB);
const int32_t step_round = (m_volume_info.mdB >= 0)
? +step_mdB / 2
: -step_mdB / 2;
const uint32_t step = (m_volume_info.mdB + step_round) / step_mdB + amp.offset;
const uint32_t volume = 0b1'0'1'1'0000'0'0000000 | step;
TRY(m_controller->send_command({
.data = static_cast<uint8_t>(volume & 0xFF),
.command = static_cast<uint16_t>(0x300 | (volume >> 8)),
.node_index = path[i]->id,
.codec_address = m_cid,
}));
break;
}
if (m_volume_info.min_mdB == 0 && m_volume_info.max_mdB == 0)
m_volume_info.mdB = 0;
return {};
}