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/*************************************************************************** |
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* Copyright (c) 2024 Microsoft Corporation |
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* Copyright (c) 2026-present Eclipse ThreadX contributors |
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* |
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* This program and the accompanying materials are made available under the |
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* terms of the MIT License which is available at |
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* https://opensource.org/licenses/MIT. |
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* |
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* SPDX-License-Identifier: MIT |
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**************************************************************************/ |
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/**************************************************************************/ |
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/**************************************************************************/ |
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/** */ |
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/** USBX Component */ |
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/** */ |
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/** Device HID Class */ |
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/** */ |
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/**************************************************************************/ |
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/**************************************************************************/ |
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#define UX_SOURCE_CODE |
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/* Include necessary system files. */ |
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#include "ux_api.h" |
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#include "ux_device_class_hid.h" |
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#include "ux_device_stack.h" |
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/**************************************************************************/ |
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/* */ |
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/* FUNCTION RELEASE */ |
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/* */ |
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/* _ux_device_class_hid_descriptor_send PORTABLE C */ |
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/* 6.1.8 */ |
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/* AUTHOR */ |
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/* */ |
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/* Chaoqiong Xiao, Microsoft Corporation */ |
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/* */ |
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/* DESCRIPTION */ |
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/* */ |
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/* This function sends back the class descriptor required by the host. */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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/* descriptor_type Descriptor type */ |
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/* descriptor_index Index of descriptor */ |
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/* host_length Length requested by host */ |
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/* */ |
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/* OUTPUT */ |
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/* */ |
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/* Completion Status */ |
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/* */ |
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/* CALLS */ |
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/* */ |
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/* (ux_slave_dcd_function) DCD dispatch function */ |
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/* _ux_device_stack_transfer_request Process transfer request */ |
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/* _ux_utility_memory_copy Memory copy */ |
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/* */ |
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/* CALLED BY */ |
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/* */ |
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/* Application */ |
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/* Device Stack */ |
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/* */ |
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/**************************************************************************/ |
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UINT _ux_device_class_hid_descriptor_send(UX_SLAVE_CLASS_HID *hid, ULONG descriptor_type, |
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ULONG request_index, ULONG host_length) |
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{ |
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UX_SLAVE_DCD *dcd; |
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UX_SLAVE_DEVICE *device; |
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UX_SLAVE_TRANSFER *transfer_request; |
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UX_SLAVE_ENDPOINT *endpoint; |
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UCHAR * device_framework; |
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UCHAR * device_framework_end; |
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ULONG descriptor_length; |
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UINT status = UX_ERROR; |
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ULONG length; |
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UCHAR interface_number = 0xFF; |
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UX_PARAMETER_NOT_USED(request_index); |
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/* If trace is enabled, insert this event into the trace buffer. */ |
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UX_TRACE_IN_LINE_INSERT(UX_TRACE_DEVICE_CLASS_HID_DESCRIPTOR_SEND, hid, descriptor_type, request_index, 0, UX_TRACE_DEVICE_CLASS_EVENTS, 0, 0) |
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/* Get the pointer to the DCD. */ |
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dcd = &_ux_system_slave -> ux_system_slave_dcd; |
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/* Get the pointer to the device. */ |
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device = &_ux_system_slave -> ux_system_slave_device; |
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/* Get the control endpoint associated with the device. */ |
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endpoint = &device -> ux_slave_device_control_endpoint; |
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/* Get the pointer to the transfer request associated with the endpoint. */ |
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transfer_request = &endpoint -> ux_slave_endpoint_transfer_request; |
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/* Set the direction to OUT. */ |
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transfer_request -> ux_slave_transfer_request_phase = UX_TRANSFER_PHASE_DATA_OUT; |
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/* Shift the descriptor type in the low byte field. */ |
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descriptor_type = (UCHAR) ((descriptor_type >> 8) & 0xff); |
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/* What type of descriptor do we need to return? */ |
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✓✓✓ |
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switch (descriptor_type) |
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{ |
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case UX_DEVICE_CLASS_HID_DESCRIPTOR_HID: |
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/* We should have a HID descriptor as part of the config descriptor. */ |
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device_framework = _ux_system_slave -> ux_system_slave_device_framework; |
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device_framework_end = device_framework + _ux_system_slave -> ux_system_slave_device_framework_length; |
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/* Parse the device framework and locate the HID descriptor. |
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There is only one HID descriptor. */ |
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✓✓ |
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while (device_framework < device_framework_end) |
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{ |
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/* Get the type of the current descriptor. */ |
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descriptor_type = *(device_framework + 1); |
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/* And its length. */ |
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descriptor_length = (ULONG) *device_framework; |
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/* Save interface number for later check. */ |
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✓✓ |
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if (descriptor_type == UX_INTERFACE_DESCRIPTOR_ITEM) |
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interface_number = *(device_framework + 2); |
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/* Check if this is a HID report descriptor. */ |
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✓✓ |
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if ((descriptor_type == UX_DEVICE_CLASS_HID_DESCRIPTOR_HID) && |
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✓✓ |
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(interface_number == (UCHAR)request_index)) |
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{ |
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/* Ensure the host does not demand a length beyond our descriptor (Windows does that) |
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and do not return more than what is allowed. */ |
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✓✓ |
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if (descriptor_length < host_length) |
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length = descriptor_length; |
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else |
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length = host_length; |
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/* Check buffer length, since descriptor length may exceed buffer... */ |
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✓✓ |
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if (length > UX_SLAVE_REQUEST_CONTROL_MAX_LENGTH) |
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{ |
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/* Error trap. */ |
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_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_MEMORY_INSUFFICIENT); |
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/* If trace is enabled, insert this event into the trace buffer. */ |
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UX_TRACE_IN_LINE_INSERT(UX_TRACE_ERROR, UX_MEMORY_INSUFFICIENT, hid, 0, 0, UX_TRACE_ERRORS, 0, 0) |
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/* Stall the endpoint. */ |
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status = dcd -> ux_slave_dcd_function(dcd, UX_DCD_STALL_ENDPOINT, endpoint); |
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break; |
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} |
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/* Copy the device descriptor into the transfer request memory. */ |
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_ux_utility_memory_copy(transfer_request -> ux_slave_transfer_request_data_pointer, |
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device_framework, length); /* Use case of memcpy is verified. */ |
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/* We can return the configuration descriptor. */ |
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status = _ux_device_stack_transfer_request(transfer_request, length, host_length); |
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break; |
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} |
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/* Point to the next descriptor. */ |
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device_framework += descriptor_length; |
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} |
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/* Stall the endpoint if not found or corrupt. */ |
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✓✓ |
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if (device_framework >= device_framework_end) |
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status = dcd -> ux_slave_dcd_function(dcd, UX_DCD_STALL_ENDPOINT, endpoint); |
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break; |
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case UX_DEVICE_CLASS_HID_DESCRIPTOR_REPORT: |
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/* Get the length of entire configuration descriptor. */ |
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descriptor_length = hid -> ux_device_class_hid_report_length; |
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/* Ensure the host does not demand a length beyond our descriptor (Windows does that) |
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and do not return more than what is allowed. */ |
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✓✓ |
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if (descriptor_length < host_length) |
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length = descriptor_length; |
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else |
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length = host_length; |
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/* Check buffer length, since total descriptors length may exceed buffer... */ |
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✓✓ |
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if (length > UX_SLAVE_REQUEST_CONTROL_MAX_LENGTH) |
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{ |
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/* Error trap. */ |
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_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_MEMORY_INSUFFICIENT); |
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/* If trace is enabled, insert this event into the trace buffer. */ |
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UX_TRACE_IN_LINE_INSERT(UX_TRACE_ERROR, UX_MEMORY_INSUFFICIENT, hid, 0, 0, UX_TRACE_ERRORS, 0, 0) |
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/* Stall the endpoint. */ |
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status = dcd -> ux_slave_dcd_function(dcd, UX_DCD_STALL_ENDPOINT, endpoint); |
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break; |
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} |
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/* Copy the device descriptor into the transfer request memory. */ |
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_ux_utility_memory_copy(transfer_request -> ux_slave_transfer_request_data_pointer, |
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hid -> ux_device_class_hid_report_address, length); /* Use case of memcpy is verified. */ |
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/* We can return the report descriptor. */ |
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status = _ux_device_stack_transfer_request(transfer_request, length, host_length); |
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break; |
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case UX_DEVICE_CLASS_HID_DESCRIPTOR_PHYSICAL: |
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/* Not treated for now. Fall through and Stall endpoint. */ |
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default: |
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/* Stall the endpoint. */ |
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dcd -> ux_slave_dcd_function(dcd, UX_DCD_STALL_ENDPOINT, endpoint); |
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return(UX_ERROR); |
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} |
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/* Return the status to the caller. */ |
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return(status); |
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} |