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Kernel/USB: Add support for async & interrupt transfers

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Add support for async transfers by using a separate kernel task to poll
a list of active async transfers on a set time interval, and invoke
their user-provided callback function when they are complete. Also add
support for the interrupt class of transfers, building off of this async
functionality.
This commit is contained in:
b14ckcat 2022-10-17 01:22:54 -04:00 • committed by Andrew Kaster
parent 1aa16b4dd4
commit 7400eb3640
8 changed files with 181 additions and 62 deletions
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13
Kernel/Bus/USB/USBTransfer.cpp
View file

@ -9,15 +9,16 @@
namespace Kernel::USB {
ErrorOr<NonnullLockRefPtr<Transfer>> Transfer::try_create(Pipe& pipe, u16 length, Memory::Region& dma_buffer)
ErrorOr<NonnullLockRefPtr<Transfer>> Transfer::create(Pipe& pipe, u16 length, Memory::Region& dma_buffer, USBAsyncCallback callback)
{
return adopt_nonnull_lock_ref_or_enomem(new (nothrow) Transfer(pipe, length, dma_buffer));
return adopt_nonnull_lock_ref_or_enomem(new (nothrow) Transfer(pipe, length, dma_buffer, move(callback)));
}
Transfer::Transfer(Pipe& pipe, u16 len, Memory::Region& dma_buffer)
Transfer::Transfer(Pipe& pipe, u16 len, Memory::Region& dma_buffer, USBAsyncCallback callback)
: m_pipe(pipe)
, m_dma_buffer(dma_buffer)
, m_transfer_data_size(len)
, m_callback(move(callback))
{
}
@ -49,4 +50,10 @@ ErrorOr<void> Transfer::write_buffer(u16 len, void* data)
return {};
}
void Transfer::invoke_async_callback()
{
if (m_callback)
m_callback(this);
}
}