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common/usbx_host_classes/src/ux_host_class_storage_start_stop.c
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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 */
/** */
/** Storage Class */
/** */
/**************************************************************************/
/**************************************************************************/
/* Include necessary system files. */
#define UX_SOURCE_CODE
#include "ux_api.h"
#include "ux_host_class_storage.h"
#include "ux_host_stack.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_host_class_storage_start_stop PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function starts or stops the UFI device. */
/* */
/* INPUT */
/* */
/* storage Pointer to storage class */
/* start_stop_flag 1 or 0 if start/stop */
/* */
/* OUTPUT */
/* */
/* Completion Status */
/* */
/* CALLS */
/* */
/* _ux_host_class_storage_cbw_initialize Initialize the CBW */
/* _ux_host_class_storage_transport Send transport layer command */
/* */
/* CALLED BY */
/* */
/* Storage Class */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Chaoqiong Xiao Initial Version 6.0 */
/* 09-30-2020 Chaoqiong Xiao Modified comment(s), */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
UINT _ux_host_class_storage_start_stop(UX_HOST_CLASS_STORAGE *storage,
ULONG start_stop_signal)
{
UINT status;
UCHAR *cbw;
UINT command_length;
ULONG command_retry;
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_HOST_CLASS_STORAGE_START_STOP, storage, start_stop_signal, 0, 0, UX_TRACE_HOST_CLASS_EVENTS, 0, 0)
/* Use a pointer for the CBW, easier to manipulate. */
cbw = (UCHAR *) storage -> ux_host_class_storage_cbw;
/* Get the START_STOP Command Length. */
#ifdef UX_HOST_CLASS_STORAGE_INCLUDE_LEGACY_PROTOCOL_SUPPORT
if (storage -> ux_host_class_storage_interface -> ux_interface_descriptor.bInterfaceSubClass == UX_HOST_CLASS_STORAGE_SUBCLASS_UFI)
command_length = UX_HOST_CLASS_STORAGE_START_STOP_COMMAND_LENGTH_UFI;
else
command_length = UX_HOST_CLASS_STORAGE_START_STOP_COMMAND_LENGTH_SBC;
#else
command_length = UX_HOST_CLASS_STORAGE_START_STOP_COMMAND_LENGTH_SBC;
#endif
/* Initialize the CBW for this command. */
_ux_host_class_storage_cbw_initialize(storage, 0, 0, command_length);
/* Prepare the START STOP command block. */
*(cbw + UX_HOST_CLASS_STORAGE_CBW_CB + UX_HOST_CLASS_STORAGE_START_STOP_OPERATION) = UX_HOST_CLASS_STORAGE_SCSI_START_STOP;
/* Set the required signal. */
*(cbw + UX_HOST_CLASS_STORAGE_CBW_CB + UX_HOST_CLASS_STORAGE_START_STOP_START_BIT) = (UCHAR) start_stop_signal;
/* On floppies, this operation tends to fail a few times. So we try harder. */
for (command_retry = 0; command_retry < 50; command_retry++)
{
/* Send the command to transport layer. */
status = _ux_host_class_storage_transport(storage, UX_NULL);
/* If we have a transport error give up. */
if(status != UX_SUCCESS)
/* Return completion status. */
return(status);
/* Check the CSW. We may learn something there about the state of the device. */
if (storage -> ux_host_class_storage_sense_code == 0)
return(UX_SUCCESS);
}
/* The start/Stop did not work. */
return(UX_ERROR);
}