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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 */
/** */
/** Device CCID Class */
/** */
/**************************************************************************/
/**************************************************************************/
#define UX_SOURCE_CODE
/* Include necessary system files. */
#include "ux_api.h"
#if !defined(UX_DEVICE_STANDALONE)
#include "ux_device_class_ccid.h"
#include "ux_device_stack.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_device_class_ccid_notify_thread_entry PORTABLE C */
/* 6.2.1 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function is the thread of the CCID interrupt IN endpoint. It */
/* is waiting for the application event to start interrupt IN. */
/* */
/* INPUT */
/* */
/* ccid_inst Address of ccid class */
/* container (32-bit) */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* CALLS */
/* */
/* _ux_device_stack_transfer_request Request transfer */
/* */
/* CALLED BY */
/* */
/* ThreadX */
/* */
/**************************************************************************/
VOID _ux_device_class_ccid_notify_thread_entry(ULONG ccid_inst)
{
UX_SLAVE_DEVICE *device;
UX_DEVICE_CLASS_CCID *ccid;
UX_DEVICE_CLASS_CCID_SLOT *slot;
UX_DEVICE_CLASS_CCID_PARAMETER *parameter;
UX_SLAVE_ENDPOINT *endpoint;
UX_SLAVE_TRANSFER *transfer;
UCHAR *buffer;
ULONG length;
INT i;
UCHAR icc_mask;
UINT byte_pos, bits_pos;
UINT status;
/* Cast properly the ccid instance. */
UX_THREAD_EXTENSION_PTR_GET(ccid, UX_DEVICE_CLASS_CCID, ccid_inst)
/* Get the pointer to the device. */
device = &_ux_system_slave -> ux_system_slave_device;
/* This thread runs forever but can be suspended or resumed by the user application. */
status = UX_SUCCESS;
while(1)
{
/* Error cases. */
if (status != UX_SUCCESS)
{
/* We need to suspend ourselves. We will be resumed by the
application if needed. */
_ux_utility_thread_suspend(&ccid -> ux_device_class_ccid_notify_thread);
status = UX_SUCCESS;
continue;
}
status = UX_ERROR;
/* Check device state. */
if (device -> ux_slave_device_state != UX_DEVICE_CONFIGURED)
continue;
/* Check endpoint. */
endpoint = ccid -> ux_device_class_ccid_endpoint_notify;
if (endpoint == UX_NULL)
continue;
transfer = &endpoint -> ux_slave_endpoint_transfer_request;
/* Wait event. */
status = _ux_utility_semaphore_get(&ccid -> ux_device_class_ccid_notify_semaphore,
UX_WAIT_FOREVER);
if (status != UX_SUCCESS)
continue;
/* Build slot change/hardware error message. */
buffer = transfer -> ux_slave_transfer_request_data_pointer;
length = 0;
/* By default no message. */
buffer[UX_DEVICE_CLASS_CCID_OFFSET_MESSAGE_TYPE] = 0;
/* Build slot hardware error message. */
parameter = &ccid -> ux_device_class_ccid_parameter;
_ux_device_class_ccid_lock(ccid);
slot = ccid -> ux_device_class_ccid_slots;
for (i = 0; i < parameter -> ux_device_class_ccid_max_n_slots; i ++)
{
/* Check if there is hardware error notification. */
if (slot -> ux_device_class_ccid_slot_flags &
UX_DEVICE_CLASS_CCID_FLAG_NOTIFY_HW_ERROR)
{
slot -> ux_device_class_ccid_slot_flags &=
(UCHAR)~UX_DEVICE_CLASS_CCID_FLAG_NOTIFY_HW_ERROR;
buffer[UX_DEVICE_CLASS_CCID_OFFSET_MESSAGE_TYPE] =
UX_DEVICE_CLASS_CCID_RDR_TO_PC_HARDWARE_ERROR;
buffer[UX_DEVICE_CLASS_CCID_OFFSET_HW_ERROR_SLOT] = (UCHAR)i;
buffer[UX_DEVICE_CLASS_CCID_OFFSET_HW_ERROR_SEQ] =
slot -> ux_device_class_ccid_slot_hw_error_seq;
buffer[UX_DEVICE_CLASS_CCID_OFFSET_HW_ERROR_CODE] =
slot -> ux_device_class_ccid_slot_hw_error;
length = 4;
break;
}
/* Next slot. */
slot ++;
}
/* Build slot changes message. */
if (buffer[UX_DEVICE_CLASS_CCID_OFFSET_MESSAGE_TYPE] == 0)
{
/* Scan slots. */
slot = ccid -> ux_device_class_ccid_slots;
for (i = 0, byte_pos = 1; ; byte_pos ++)
{
/* Reset bits. */
buffer[byte_pos] = 0;
/* Scan 4 slots. */
for(bits_pos = 0; bits_pos < 8; bits_pos += 2)
{
/* Slot state bit. */
icc_mask = (UCHAR)((slot -> ux_device_class_ccid_slot_icc_status ==
UX_DEVICE_CLASS_CCID_SLOT_STATUS_ICC_NOT_PRESENT) ?
0u : 1u);
/* Check if there is change notification. */
if (slot -> ux_device_class_ccid_slot_flags &
UX_DEVICE_CLASS_CCID_FLAG_NOTIFY_CHANGE)
{
slot -> ux_device_class_ccid_slot_flags &=
(UCHAR)~UX_DEVICE_CLASS_CCID_FLAG_NOTIFY_CHANGE;
/* Message type. */
buffer[UX_DEVICE_CLASS_CCID_OFFSET_MESSAGE_TYPE] =
UX_DEVICE_CLASS_CCID_RDR_TO_PC_NOTIFY_SLOT_CHANGE;
/* Slot change bit. */
icc_mask |= (UCHAR)0x02u;
}
/* Modify bits. */
buffer[byte_pos] |= (UCHAR)(icc_mask << bits_pos);
/* Next slot. */
i ++;
if (i >= parameter -> ux_device_class_ccid_max_n_slots)
break;
slot ++;
}
if (i >= parameter -> ux_device_class_ccid_max_n_slots)
break;
}
/* Buffer length should include last byte. */
length = byte_pos + 1;
}
_ux_device_class_ccid_unlock(ccid);
/* Check message to see if there is message to send. */
if (buffer[UX_DEVICE_CLASS_CCID_OFFSET_MESSAGE_TYPE] == 0)
continue;
/* Send request. */
status = _ux_device_stack_transfer_request(transfer, length, length);
}
}
#endif
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