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/**************************************************************************/
/* */
/* Copyright (c) Microsoft Corporation. All rights reserved. */
/* */
/* This software is licensed under the Microsoft Software License */
/* Terms for Microsoft Azure RTOS. Full text of the license can be */
/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
/* and in the root directory of this software. */
/* */
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** USBX Component */
/** */
/** HID Class */
/** */
/**************************************************************************/
/**************************************************************************/
/* Include necessary system files. */
#define UX_SOURCE_CODE
#include "ux_api.h"
#include "ux_host_class_hid.h"
#include "ux_host_stack.h"
#if defined(UX_HOST_STANDALONE)
#define UX_HOST_CLASS_HID_ENUM_HID_DESC_READ (UX_STATE_WAIT)
#define UX_HOST_CLASS_HID_ENUM_HID_DESC_PARSE (UX_STATE_CLASS_STEP + 1)
#define UX_HOST_CLASS_HID_ENUM_REPORT_DESC_READ (UX_STATE_CLASS_STEP + 2)
#define UX_HOST_CLASS_HID_ENUM_REPORT_DESC_PARSE (UX_STATE_CLASS_STEP + 3)
#define UX_HOST_CLASS_HID_ENUM_CLIENT_SEARCH (UX_STATE_CLASS_STEP + 4)
#define UX_HOST_CLASS_HID_ENUM_CLIENT_ACTIVATE_WAIT (UX_STATE_CLASS_STEP + 6)
#define UX_HOST_CLASS_HID_ENUM_TRANSFER_WAIT (UX_STATE_CLASS_STEP + 7)
#define UX_HOST_CLASS_HID_ENUM_ERROR (UX_STATE_CLASS_STEP + 8)
#define UX_HOST_CLASS_HID_ENUM_DONE (UX_STATE_CLASS_STEP + 9)
static inline UINT _ux_host_class_hid_activate_wait(UX_HOST_CLASS_COMMAND *command);
#endif
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_host_class_hid_entry PORTABLE C */
/* 6.1.10 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function is the entry point of the HID class. It will be */
/* called by the USB stack enumeration module when there is a new */
/* device on the bus or when there is a device extraction. */
/* */
/* INPUT */
/* */
/* command Pointer to command */
/* */
/* OUTPUT */
/* */
/* Completion Status */
/* */
/* CALLS */
/* */
/* _ux_host_class_hid_activate Activate HID class */
/* _ux_host_class_hid_deactivate Deactivate HID class */
/* _ux_utility_memory_free Free memory */
/* */
/* CALLED BY */
/* */
/* Application */
/* HID Class */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Chaoqiong Xiao Initial Version 6.0 */
/* 09-30-2020 Chaoqiong Xiao Modified comment(s), */
/* added destroy command, */
/* resulting in version 6.1 */
/* 01-31-2022 Chaoqiong Xiao Modified comment(s), */
/* added standalone support, */
/* resulting in version 6.1.10 */
/* */
/**************************************************************************/
UINT _ux_host_class_hid_entry(UX_HOST_CLASS_COMMAND *command)
{
UINT status;
INT scan_index;
UX_HOST_CLASS_HID_CLIENT *client;
UX_HOST_CLASS_HID_CLIENT_COMMAND client_command;
/* The command request will tell us we need to do here, either a enumeration
query, an activation or a deactivation. */
switch (command -> ux_host_class_command_request)
{
case UX_HOST_CLASS_COMMAND_QUERY:
/* The query command is used to let the stack enumeration process know if we want to own
this device or not. */
if ((command -> ux_host_class_command_usage == UX_HOST_CLASS_COMMAND_USAGE_CSP) &&
(command -> ux_host_class_command_class == UX_HOST_CLASS_HID_CLASS))
return(UX_SUCCESS);
else
return(UX_NO_CLASS_MATCH);
case UX_HOST_CLASS_COMMAND_ACTIVATE:
/* The activate command is used when the device inserted has found a parent and
is ready to complete the enumeration. */
status = _ux_host_class_hid_activate(command);
return(status);
#if defined(UX_HOST_STANDALONE)
case UX_HOST_CLASS_COMMAND_ACTIVATE_WAIT:
status = _ux_host_class_hid_activate_wait(command);
return(status);
#endif
case UX_HOST_CLASS_COMMAND_DEACTIVATE:
/* The deactivate command is used when the device has been extracted either
directly or when its parents has been extracted. */
status = _ux_host_class_hid_deactivate(command);
return(status);
case UX_HOST_CLASS_COMMAND_DESTROY:
/* The destroy command is used when the class is unregistered. */
/* Free allocated resources for clients. */
if (command -> ux_host_class_command_class_ptr -> ux_host_class_client != UX_NULL)
{
/* Get client. */
client = command -> ux_host_class_command_class_ptr -> ux_host_class_client;
/* Inform clients for destroy. */
for (scan_index = 0; scan_index < UX_HOST_CLASS_HID_MAX_CLIENTS; scan_index ++)
{
/* Inform client for destroy. */
client_command.ux_host_class_hid_client_command_request = UX_HOST_CLASS_COMMAND_DESTROY;
client_command.ux_host_class_hid_client_command_container = (VOID *)command -> ux_host_class_command_class_ptr;
client -> ux_host_class_hid_client_handler(&client_command);
}
/* Free clients memory. */
_ux_utility_memory_free(command -> ux_host_class_command_class_ptr -> ux_host_class_client);
command -> ux_host_class_command_class_ptr -> ux_host_class_client = UX_NULL;
}
return(UX_SUCCESS);
default:
/* Error trap. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_FUNCTION_NOT_SUPPORTED);
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_ERROR, UX_FUNCTION_NOT_SUPPORTED, 0, 0, 0, UX_TRACE_ERRORS, 0, 0)
/* Return error status. */
return(UX_FUNCTION_NOT_SUPPORTED);
}
}
#if defined(UX_HOST_STANDALONE)
static inline VOID _ux_host_class_hid_descriptor_read(UX_HOST_CLASS_HID *hid)
{
UX_INTERFACE *interface;
UX_CONFIGURATION *configuration;
UX_ENDPOINT *control_endpoint;
UX_TRANSFER *transfer_request;
/* We need to get the default control endpoint transfer request pointer. */
control_endpoint = &hid -> ux_host_class_hid_device -> ux_device_control_endpoint;
transfer_request = &control_endpoint -> ux_endpoint_transfer_request;
/* Need to allocate memory for the descriptor. */
interface = hid -> ux_host_class_hid_interface;
configuration = interface -> ux_interface_configuration;
hid -> ux_host_class_hid_allocated = _ux_utility_memory_allocate(
UX_SAFE_ALIGN, UX_CACHE_SAFE_MEMORY,
configuration -> ux_configuration_descriptor.wTotalLength);
if (hid -> ux_host_class_hid_allocated == UX_NULL)
{
/* Next: error. */
hid -> ux_host_class_hid_status = UX_MEMORY_INSUFFICIENT;
hid -> ux_host_class_hid_enum_state = UX_HOST_CLASS_HID_ENUM_ERROR;
return;
}
/* Create a transfer request for the GET_DESCRIPTOR request. */
transfer_request -> ux_transfer_request_data_pointer = hid -> ux_host_class_hid_allocated;
transfer_request -> ux_transfer_request_requested_length = configuration -> ux_configuration_descriptor.wTotalLength;
transfer_request -> ux_transfer_request_function = UX_GET_DESCRIPTOR;
transfer_request -> ux_transfer_request_type = UX_REQUEST_IN | UX_REQUEST_TYPE_STANDARD | UX_REQUEST_TARGET_DEVICE;
transfer_request -> ux_transfer_request_value = UX_CONFIGURATION_DESCRIPTOR_ITEM << 8;
transfer_request -> ux_transfer_request_index = 0;
UX_TRANSFER_STATE_RESET(transfer_request);
/* Next: transfer and parse. */
hid -> ux_host_class_hid_enum_state = UX_HOST_CLASS_HID_ENUM_TRANSFER_WAIT;
hid -> ux_host_class_hid_next_state = UX_HOST_CLASS_HID_ENUM_HID_DESC_PARSE;
}
static inline VOID _ux_host_class_hid_report_descriptor_read(UX_HOST_CLASS_HID *hid)
{
UX_ENDPOINT *control_endpoint;
UX_TRANSFER *transfer_request;
/* We need to get the default control endpoint transfer request pointer. */
control_endpoint = &hid -> ux_host_class_hid_device -> ux_device_control_endpoint;
transfer_request = &control_endpoint -> ux_endpoint_transfer_request;
/* Need to allocate memory for the descriptor. */
hid -> ux_host_class_hid_allocated = _ux_utility_memory_allocate(
UX_SAFE_ALIGN, UX_CACHE_SAFE_MEMORY,
hid -> ux_host_class_hid_descriptor.wItemLength);
if (hid -> ux_host_class_hid_allocated == UX_NULL)
{
/* Next: error. */
hid -> ux_host_class_hid_status = UX_MEMORY_INSUFFICIENT;
hid -> ux_host_class_hid_enum_state = UX_HOST_CLASS_HID_ENUM_ERROR;
return;
}
/* Create a transfer request for the GET_DESCRIPTOR request. */
transfer_request -> ux_transfer_request_data_pointer = hid -> ux_host_class_hid_allocated;
transfer_request -> ux_transfer_request_requested_length = hid -> ux_host_class_hid_descriptor.wItemLength;
transfer_request -> ux_transfer_request_function = UX_GET_DESCRIPTOR;
transfer_request -> ux_transfer_request_type = UX_REQUEST_IN | UX_REQUEST_TYPE_STANDARD | UX_REQUEST_TARGET_INTERFACE;
transfer_request -> ux_transfer_request_value = UX_HOST_CLASS_HID_REPORT_DESCRIPTOR << 8;
transfer_request -> ux_transfer_request_index = hid -> ux_host_class_hid_interface -> ux_interface_descriptor.bInterfaceNumber;
UX_TRANSFER_STATE_RESET(transfer_request);
/* Next: transfer and parse. */
hid -> ux_host_class_hid_enum_state = UX_HOST_CLASS_HID_ENUM_TRANSFER_WAIT;
hid -> ux_host_class_hid_next_state = UX_HOST_CLASS_HID_ENUM_REPORT_DESC_PARSE;
}
static inline VOID _ux_host_class_hid_hid_descriptor_parse(UX_HOST_CLASS_HID *hid)
{
UX_DEVICE *device;
UX_TRANSFER *transfer;
UCHAR *descriptor;
UINT descriptor_length;
UINT descriptor_type;
UINT descriptor_2;
ULONG total_length;
ULONG interface_number;
UINT interface_found = UX_FALSE;
/* Get transfer. */
device = hid -> ux_host_class_hid_device;
transfer = &device -> ux_device_control_endpoint.ux_endpoint_transfer_request;
/* Get current interface number. */
interface_number = hid -> ux_host_class_hid_interface ->
ux_interface_descriptor.bInterfaceNumber;
/* Get received descriptor. */
descriptor = transfer -> ux_transfer_request_data_pointer;
total_length = transfer -> ux_transfer_request_actual_length;
/* The HID descriptor is embedded within the configuration descriptor.
We parse the entire descriptor to locate the HID portion. */
while(total_length)
{
/* Get length and type of the descriptor. */
descriptor_length = *descriptor;
descriptor_type = *(descriptor + 1);
descriptor_2 = *(descriptor + 2);
/* Make sure this descriptor has at least the minimum length. */
if (descriptor_length < 3)
break;
switch(descriptor_type)
{
case UX_INTERFACE_DESCRIPTOR_ITEM:
/* Check if interface is what we expected. */
interface_found = (interface_number == descriptor_2) ? UX_TRUE : UX_FALSE;
break;
case UX_HOST_CLASS_HID_DESCRIPTOR:
/* Check if we are in expected interface. */
if (!interface_found)
break;
/* Save HID descriptor for later usage.
Note only first 7 entries are saved, since we only support first
9 bytes, no optional descriptors are supported for now. */
_ux_utility_descriptor_parse(descriptor,
_ux_system_hid_descriptor_structure, UX_HID_DESCRIPTOR_ENTRIES,
(UCHAR *) &hid -> ux_host_class_hid_descriptor);
/* Free allocated bytes. */
_ux_utility_memory_free(hid -> ux_host_class_hid_allocated);
hid -> ux_host_class_hid_allocated = UX_NULL;
/* Next: HID report descriptor read. */
hid -> ux_host_class_hid_enum_state = UX_HOST_CLASS_HID_ENUM_REPORT_DESC_READ;
return;
default:
break;
}
/* Verify if the descriptor is still valid. */
if (descriptor_length > total_length)
break;
/* Next descriptor. */
descriptor += descriptor_length;
total_length -= descriptor_length;
}
/* Error trap. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_DESCRIPTOR_CORRUPTED);
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_ERROR, UX_DESCRIPTOR_CORRUPTED, descriptor, 0, 0, UX_TRACE_ERRORS, 0, 0)
/* Return an error. */
hid -> ux_host_class_hid_status = UX_DESCRIPTOR_CORRUPTED;
hid -> ux_host_class_hid_enum_state = UX_HOST_CLASS_HID_ENUM_ERROR;
}
static inline VOID _ux_host_class_hid_report_descriptor_parse(UX_HOST_CLASS_HID *hid)
{
UX_DEVICE *device;
UX_TRANSFER *transfer;
UCHAR *descriptor;
ULONG length;
UX_HOST_CLASS_HID_ITEM item;
UINT status;
/* Get transfer. */
device = hid -> ux_host_class_hid_device;
transfer = &device -> ux_device_control_endpoint.ux_endpoint_transfer_request;
/* Get buffer and length. */
descriptor = hid -> ux_host_class_hid_allocated;
length = transfer -> ux_transfer_request_actual_length;
/* Parse the report descriptor and build the report items. */
while (length)
{
/* Get one item from the report and analyze it. */
_ux_host_class_hid_report_item_analyse(descriptor, &item);
/* Point the descriptor right after the item identifier. */
descriptor += item.ux_host_class_hid_item_report_format;
/* Process relative to the item type. */
switch (item.ux_host_class_hid_item_report_type)
{
case UX_HOST_CLASS_HID_TYPE_GLOBAL:
/* This is a global item. */
status = _ux_host_class_hid_global_item_parse(hid, &item, descriptor);
break;
case UX_HOST_CLASS_HID_TYPE_MAIN:
/* This is a main item. */
status = _ux_host_class_hid_main_item_parse(hid, &item, descriptor);
break;
case UX_HOST_CLASS_HID_TYPE_LOCAL:
/* This is a local item. */
status = _ux_host_class_hid_local_item_parse(hid, &item, descriptor);
break;
default:
/* This is a reserved item, meaning it shouldn't be used! */
/* Set status to error. The check after this switch statement
will handle the rest. */
status = UX_DESCRIPTOR_CORRUPTED;
break;
}
/* Recheck the status code. */
if (status != UX_SUCCESS)
{
break;
}
/* Jump to the next item. */
descriptor += item.ux_host_class_hid_item_report_length;
/* Verify that the report descriptor is not corrupted. */
if (length < item.ux_host_class_hid_item_report_length)
{
/* Return error status. */
status = (UX_DESCRIPTOR_CORRUPTED);
break;
}
/* Adjust the length. */
length -= (ULONG)(item.ux_host_class_hid_item_report_length + item.ux_host_class_hid_item_report_format);
}
if (status != UX_SUCCESS)
{
hid -> ux_host_class_hid_status = status;
hid -> ux_host_class_hid_enum_state = UX_HOST_CLASS_HID_ENUM_ERROR;
return;
}
/* Search the HID interrupt endpoint. */
status = _ux_host_class_hid_interrupt_endpoint_search(hid);
if (status != UX_SUCCESS)
{
hid -> ux_host_class_hid_status = status;
hid -> ux_host_class_hid_enum_state = UX_HOST_CLASS_HID_ENUM_ERROR;
return;
}
/* Allocated memory is no use now, free. */
_ux_utility_memory_free(hid -> ux_host_class_hid_allocated);
hid -> ux_host_class_hid_allocated = UX_NULL;
/* Next: search & activate client. */
hid -> ux_host_class_hid_enum_state = UX_HOST_CLASS_HID_ENUM_CLIENT_SEARCH;
}
static inline VOID _ux_host_class_hid_client_activate_wait(UX_HOST_CLASS_HID *hid)
{
UX_HOST_CLASS_HID_CLIENT_COMMAND hid_client_command;
UINT status;
hid_client_command.ux_host_class_hid_client_command_instance = hid;
hid_client_command.ux_host_class_hid_client_command_request = UX_HOST_CLASS_COMMAND_ACTIVATE_WAIT;
/* Call the HID client with an activate command. */
status = hid -> ux_host_class_hid_client -> ux_host_class_hid_client_handler(&hid_client_command);
/* Error. */
if (status < UX_STATE_NEXT)
{
hid -> ux_host_class_hid_client = UX_NULL;
hid -> ux_host_class_hid_status = UX_DEVICE_ENUMERATION_FAILURE;
hid -> ux_host_class_hid_enum_state = UX_HOST_CLASS_HID_ENUM_ERROR;
return;
}
/* Success. */
if (status == UX_STATE_NEXT)
{
hid -> ux_host_class_hid_enum_state = UX_HOST_CLASS_HID_ENUM_DONE;
return;
}
/* Wait. */
return;
}
static inline UINT _ux_host_class_hid_activate_wait(UX_HOST_CLASS_COMMAND *command)
{
UX_INTERFACE *interface;
UX_ENDPOINT *control_endpoint;
UX_TRANSFER *transfer;
UX_HOST_CLASS_HID *hid;
UINT status;
/* Get the instance for this class. */
interface = (UX_INTERFACE *)command -> ux_host_class_command_container;
hid = (UX_HOST_CLASS_HID *) interface -> ux_interface_class_instance;
/* Run initialize state machine. */
switch(hid -> ux_host_class_hid_enum_state)
{
case UX_HOST_CLASS_HID_ENUM_HID_DESC_READ :
_ux_host_class_hid_descriptor_read(hid);
break;
case UX_HOST_CLASS_HID_ENUM_HID_DESC_PARSE :
_ux_host_class_hid_hid_descriptor_parse(hid);
break;
case UX_HOST_CLASS_HID_ENUM_REPORT_DESC_READ :
_ux_host_class_hid_report_descriptor_read(hid);
break;
case UX_HOST_CLASS_HID_ENUM_REPORT_DESC_PARSE :
_ux_host_class_hid_report_descriptor_parse(hid);
break;
case UX_HOST_CLASS_HID_ENUM_CLIENT_SEARCH :
/* Search and activate client. */
status = _ux_host_class_hid_client_search(hid);
if (status != UX_SUCCESS)
{
/* There is no client, but HID can still be used. */
hid -> ux_host_class_hid_enum_state = UX_HOST_CLASS_HID_ENUM_DONE;
break;
}
/* Activate wait in case there is still steps for client. */
hid -> ux_host_class_hid_enum_state = UX_HOST_CLASS_HID_ENUM_CLIENT_ACTIVATE_WAIT;
/* Fall through. */
case UX_HOST_CLASS_HID_ENUM_CLIENT_ACTIVATE_WAIT :
_ux_host_class_hid_client_activate_wait(hid);
break;
case UX_HOST_CLASS_HID_ENUM_TRANSFER_WAIT :
/* Get transfer. */
control_endpoint = &hid -> ux_host_class_hid_device -> ux_device_control_endpoint;
transfer = &control_endpoint -> ux_endpoint_transfer_request;
/* Transfer state machine. */
status = _ux_host_stack_transfer_run(transfer);
/* Is it done? */
if (status <= UX_STATE_NEXT)
{
/* Is there error? */
if (transfer -> ux_transfer_request_completion_code != UX_SUCCESS)
{
hid -> ux_host_class_hid_status = transfer -> ux_transfer_request_completion_code;
hid -> ux_host_class_hid_enum_state = UX_STATE_EXIT;
break;
}
/* No error, next state. */
hid -> ux_host_class_hid_enum_state = hid -> ux_host_class_hid_next_state;
break;
}
/* Keep waiting. */
break;
case UX_HOST_CLASS_HID_ENUM_ERROR :
/* Clean interrupt endpoint. */
if (hid -> ux_host_class_hid_interrupt_endpoint &&
hid -> ux_host_class_hid_interrupt_endpoint -> ux_endpoint_transfer_request.ux_transfer_request_data_pointer)
_ux_utility_memory_free(hid -> ux_host_class_hid_interrupt_endpoint -> ux_endpoint_transfer_request.ux_transfer_request_data_pointer);
/* Clean instance. */
_ux_host_class_hid_instance_clean(hid);
/* Error, destroy the class instance and return error code. */
_ux_host_stack_class_instance_destroy(hid -> ux_host_class_hid_class, (VOID *) hid);
/* Unmount instance. */
interface -> ux_interface_class_instance = UX_NULL;
/* Free memory. */
if (hid -> ux_host_class_hid_allocated)
_ux_utility_memory_free(hid -> ux_host_class_hid_allocated);
/* Free instance. */
_ux_utility_memory_free(hid);
return(UX_STATE_NEXT);
case UX_HOST_CLASS_HID_ENUM_DONE :
/* Free temperary memory. */
if (hid -> ux_host_class_hid_allocated)
{
_ux_utility_memory_free(hid -> ux_host_class_hid_allocated);
hid -> ux_host_class_hid_allocated = UX_NULL;
}
/* Mark the HID class as live now. */
hid -> ux_host_class_hid_state = UX_HOST_CLASS_INSTANCE_LIVE;
/* We may need to inform the application if a function has been programmed in the system structure. */
if (_ux_system_host -> ux_system_host_change_function != UX_NULL)
{
/* Call system change function. */
_ux_system_host -> ux_system_host_change_function(UX_DEVICE_INSERTION, hid -> ux_host_class_hid_class, (VOID *) hid);
}
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_HOST_CLASS_HID_ACTIVATE, hid, 0, 0, 0, UX_TRACE_HOST_CLASS_EVENTS, 0, 0)
/* If trace is enabled, register this object. */
UX_TRACE_OBJECT_REGISTER(UX_TRACE_HOST_OBJECT_TYPE_INTERFACE, hid, 0, 0, 0)
hid -> ux_host_class_hid_enum_state = UX_STATE_IDLE;
return(UX_STATE_NEXT);
default: /* IDLE, Other states. */
return(UX_STATE_NEXT);
}
/* By default, keep waiting. */
return(UX_STATE_WAIT);
}
#endif
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