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/***************************************************************************
* Copyright (c) 2024 Microsoft Corporation
* Copyright (c) 2026-present Eclipse ThreadX contributors
*
* This program and the accompanying materials are made available under the
* terms of the MIT License which is available at
* https://opensource.org/licenses/MIT.
*
* SPDX-License-Identifier: MIT
**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** USBX Component */
/** */
/** HID Keyboard Client */
/** */
/**************************************************************************/
/**************************************************************************/
/* Include necessary system files. */
#define UX_SOURCE_CODE
#include "ux_api.h"
#include "ux_host_class_hid.h"
#include "ux_host_class_hid_keyboard.h"
#include "ux_host_stack.h"
#if defined(UX_HOST_STANDALONE)
#define UX_HOST_CLASS_HID_KEYBOARD_ENUM_START (UX_STATE_WAIT)
#define UX_HOST_CLASS_HID_KEYBOARD_ENUM_SET_REPORT (UX_STATE_STACK_STEP + 0)
#define UX_HOST_CLASS_HID_KEYBOARD_ENUM_SET_IDLE (UX_STATE_STACK_STEP + 1)
#define UX_HOST_CLASS_HID_KEYBOARD_ENUM_CMD_WAIT (UX_STATE_STACK_STEP + 2)
#define UX_HOST_CLASS_HID_KEYBOARD_ENUM_PERIODIC_START (UX_STATE_STACK_STEP + 3)
#define UX_HOST_CLASS_HID_KEYBOARD_ENUM_DONE (UX_STATE_STACK_STEP + 4)
static inline UINT _ux_host_class_hid_keyboard_activate_wait(UX_HOST_CLASS_HID_CLIENT_COMMAND *command);
#endif
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_host_class_hid_keyboard_entry PORTABLE C */
/* 6.1.10 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function is the entry point of the HID keyboard client. */
/* This function is called by the HID class after it has parsed a new */
/* HID report descriptor and is searching for a HID client. */
/* */
/* INPUT */
/* */
/* command Pointer to command */
/* */
/* OUTPUT */
/* */
/* Completion Status */
/* */
/* CALLS */
/* */
/* _ux_host_class_hid_keyboard_activate */
/* Activate HID keyboard */
/* _ux_host_class_hid_keyboard_deactivate */
/* Deactivate HID keyboard */
/* */
/* CALLED BY */
/* */
/* HID Class */
/* */
/**************************************************************************/
UINT _ux_host_class_hid_keyboard_entry(UX_HOST_CLASS_HID_CLIENT_COMMAND *command)
{
UINT status;
/* 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_hid_client_command_request)
{
case UX_HOST_CLASS_COMMAND_QUERY:
/* The query command is used to let the HID class know if we want to own
this device or not */
if ((command -> ux_host_class_hid_client_command_page == UX_HOST_CLASS_HID_PAGE_GENERIC_DESKTOP_CONTROLS) &&
(command -> ux_host_class_hid_client_command_usage == UX_HOST_CLASS_HID_GENERIC_DESKTOP_KEYBOARD))
return(UX_SUCCESS);
else
return(UX_NO_CLASS_MATCH);
case UX_HOST_CLASS_COMMAND_ACTIVATE:
/* The activate command is used by the HID class to start the HID client. */
status = _ux_host_class_hid_keyboard_activate(command);
/* Return completion status. */
return(status);
#if defined(UX_HOST_STANDALONE)
case UX_HOST_CLASS_COMMAND_ACTIVATE_WAIT:
return(_ux_host_class_hid_keyboard_activate_wait(command));
#endif
case UX_HOST_CLASS_COMMAND_DEACTIVATE:
/* The deactivate command is used by the HID class when it received a deactivate
command from the USBX stack and there was a HID client attached to the HID instance */
status = _ux_host_class_hid_keyboard_deactivate(command);
/* Return completion status. */
return(status);
}
/* Return error status. */
return(UX_ERROR);
}
#if defined(UX_HOST_STANDALONE)
static inline UINT _ux_host_class_hid_keyboard_activate_wait(UX_HOST_CLASS_HID_CLIENT_COMMAND *command)
{
UX_HOST_CLASS_HID *hid;
UX_HOST_CLASS_HID_CLIENT *hid_client;
UX_HOST_CLASS_HID_KEYBOARD *keyboard;
UINT status;
/* Get the instance to the HID class. */
hid = command -> ux_host_class_hid_client_command_instance;
/* And of the HID client. */
hid_client = hid -> ux_host_class_hid_client;
/* And of the keyboard instance. */
keyboard = (UX_HOST_CLASS_HID_KEYBOARD *) hid_client -> ux_host_class_hid_client_local_instance;
/* Run states. */
switch(keyboard -> ux_host_class_hid_keyboard_enum_state)
{
case UX_HOST_CLASS_HID_KEYBOARD_ENUM_START:
/* Fall through. */
case UX_HOST_CLASS_HID_KEYBOARD_ENUM_SET_REPORT:
/* Update LED in task. */
keyboard -> ux_host_class_hid_keyboard_out_state = UX_STATE_WAIT;
keyboard -> ux_host_class_hid_keyboard_enum_state =
UX_HOST_CLASS_HID_KEYBOARD_ENUM_CMD_WAIT;
keyboard -> ux_host_class_hid_keyboard_next_state =
UX_HOST_CLASS_HID_KEYBOARD_ENUM_SET_IDLE;
return(UX_STATE_WAIT);
case UX_HOST_CLASS_HID_KEYBOARD_ENUM_CMD_WAIT:
/* LEDs processed in background task. */
if (keyboard -> ux_host_class_hid_keyboard_out_state != UX_STATE_WAIT)
{
if (keyboard -> ux_host_class_hid_keyboard_status != UX_SUCCESS)
keyboard -> ux_host_class_hid_keyboard_enum_state =
UX_HOST_CLASS_HID_KEYBOARD_ENUM_DONE;
else
keyboard -> ux_host_class_hid_keyboard_enum_state =
keyboard -> ux_host_class_hid_keyboard_next_state;
}
return(UX_STATE_WAIT);
case UX_HOST_CLASS_HID_KEYBOARD_ENUM_SET_IDLE:
/* Run SET_IDLE states. */
status = _ux_host_class_hid_idle_set_run(hid, 0,
keyboard -> ux_host_class_hid_keyboard_id);
if (status < UX_STATE_WAIT)
{
keyboard -> ux_host_class_hid_keyboard_status =
hid -> ux_host_class_hid_status;
/* Set_Idle is mandatory, if there is error enum fail. */
if (keyboard -> ux_host_class_hid_keyboard_status == UX_SUCCESS)
keyboard -> ux_host_class_hid_keyboard_enum_state =
UX_HOST_CLASS_HID_KEYBOARD_ENUM_PERIODIC_START;
else
keyboard -> ux_host_class_hid_keyboard_enum_state =
UX_HOST_CLASS_HID_KEYBOARD_ENUM_DONE;
}
return(UX_STATE_WAIT);
case UX_HOST_CLASS_HID_KEYBOARD_ENUM_PERIODIC_START:
/* Start the periodic report. */
status = _ux_host_class_hid_periodic_report_start(hid);
keyboard -> ux_host_class_hid_keyboard_status = status;
/* Fall through. */
case UX_HOST_CLASS_HID_KEYBOARD_ENUM_DONE:
/* Anything failed, Free resources. */
if (keyboard -> ux_host_class_hid_keyboard_status != UX_SUCCESS)
{
/* Detach instance. */
hid_client -> ux_host_class_hid_client_local_instance = UX_NULL;
/* Free usage state. */
if (keyboard -> ux_host_class_hid_keyboard_key_state)
_ux_utility_memory_free(keyboard -> ux_host_class_hid_keyboard_key_state);
/* Free usage array. */
if (keyboard -> ux_host_class_hid_keyboard_usage_array)
_ux_utility_memory_free(keyboard -> ux_host_class_hid_keyboard_usage_array);
/* Free instance (= combined allocation; hid_client is embedded inside it). */
_ux_utility_memory_free(keyboard);
/* Signal to entry.c that the per-instance client has been freed. */
hid -> ux_host_class_hid_client = UX_NULL;
return(UX_STATE_ERROR);
}
/* Now keyboard instance is live. */
keyboard -> ux_host_class_hid_keyboard_state = UX_HOST_CLASS_INSTANCE_LIVE;
/* If all is fine and the device is mounted, 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_HID_CLIENT_INSERTION, hid -> ux_host_class_hid_class, (VOID *) hid_client);
}
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_HOST_CLASS_HID_KEYBOARD_ACTIVATE, hid, keyboard, 0, 0, UX_TRACE_HOST_CLASS_EVENTS, 0, 0)
/* Enumeration idle. */
keyboard -> ux_host_class_hid_keyboard_enum_state = UX_STATE_IDLE;
return(UX_STATE_NEXT);
default: /* IDLE, Other states. */
return(UX_STATE_NEXT);
}
}
#endif
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