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https://github.com/RGBCube/serenity
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61 lines
3 KiB
C++
61 lines
3 KiB
C++
/*
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* Copyright (c) 2021, Jesse Buhagiar <jooster669@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <Kernel/Bus/USB/USBDescriptors.h>
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#include <Kernel/Bus/USB/USBPipe.h>
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namespace Kernel::USB {
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//
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// An endpoint is the "end point" of communication of a USB device. That is, data is read from and written
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// to an endpoint via a USB pipe. As an example, during device enumeration (where we assign an address to the
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// device), we communicate with the device over the default endpoint, endpoint0, which all devices _must_
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// contain to be compliant with the USB specification.
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//
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// And endpoint describes characteristics about the transfer between the host and the device, such as:
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// - The endpoint number
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// - Max packet size of send/recv of the endpoint
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// - Transfer type (bulk, interrupt, isochronous etc)
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//
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// Take for example a USB multifunction device, such as a keyboard/mouse combination. The mouse
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// may need to be polled every n milliseconds, meaning the transfer may be isochronous (streamed),
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// while the keyboard part would only generate data once we push a key (hence an interrupt transfer).
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// Each of these data sources would be a _different_ endpoint on the device that we read from.
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class USBEndpoint {
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public:
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static constexpr u8 ENDPOINT_ADDRESS_NUMBER_MASK = 0x0f;
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static constexpr u8 ENDPOINT_ADDRESS_DIRECTION_MASK = 0x80;
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static constexpr u8 ENDPOINT_ADDRESS_DIRECTION_OUT = 0x00;
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static constexpr u8 ENDPOINT_ADDRESS_DIRECTION_IN = 0x80;
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static constexpr u8 ENDPOINT_ATTRIBUTES_TRANSFER_TYPE_MASK = 0x03;
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static constexpr u8 ENDPOINT_ATTRIBUTES_TRANSFER_TYPE_CONTROL = 0x00;
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static constexpr u8 ENDPOINT_ATTRIBUTES_TRANSFER_TYPE_ISOCHRONOUS = 0x01;
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static constexpr u8 ENDPOINT_ATTRIBUTES_TRANSFER_TYPE_BULK = 0x02;
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static constexpr u8 ENDPOINT_ATTRIBUTES_TRANSFER_TYPE_INTERRUPT = 0x03;
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static constexpr u8 ENDPOINT_ATTRIBUTES_ISO_MODE_SYNC_TYPE = 0x0c;
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static constexpr u8 ENDPOINT_ATTRIBUTES_ISO_MODE_USAGE_TYPE = 0x30;
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USBEndpointDescriptor const& descriptor() const { return m_descriptor; }
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bool is_control() const { return (m_descriptor.endpoint_attributes_bitmap & ENDPOINT_ATTRIBUTES_TRANSFER_TYPE_MASK) == ENDPOINT_ATTRIBUTES_TRANSFER_TYPE_CONTROL; }
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bool is_isochronous() const { return (m_descriptor.endpoint_attributes_bitmap & ENDPOINT_ATTRIBUTES_TRANSFER_TYPE_MASK) == ENDPOINT_ATTRIBUTES_TRANSFER_TYPE_ISOCHRONOUS; }
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bool is_bulk() const { return (m_descriptor.endpoint_attributes_bitmap & ENDPOINT_ATTRIBUTES_TRANSFER_TYPE_MASK) == ENDPOINT_ATTRIBUTES_TRANSFER_TYPE_BULK; }
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bool is_interrupt() const { return (m_descriptor.endpoint_attributes_bitmap & ENDPOINT_ATTRIBUTES_TRANSFER_TYPE_MASK) == ENDPOINT_ATTRIBUTES_TRANSFER_TYPE_INTERRUPT; }
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u16 max_packet_size() const { return m_descriptor.max_packet_size; }
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u8 polling_interval() const { return m_descriptor.poll_interval_in_frames; }
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private:
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USBEndpointDescriptor m_descriptor;
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Pipe m_pipe;
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};
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}
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