blob: bb57e0c01d19924be082e74c7943cc5c9d272152 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
|
/***************************************************************************
* 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 */
/** */
/** Host Stack */
/** */
/**************************************************************************/
/**************************************************************************/
/* Include necessary system files. */
#define UX_SOURCE_CODE
#include "ux_api.h"
#include "ux_host_stack.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_host_stack_role_swap PORTABLE C */
/* 6.1.10 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function is called when the host or the device demand a role */
/* swap. This function may be called by an application or by the HNP */
/* thread. */
/* */
/* INPUT */
/* */
/* hcd Pointer to HCD */
/* device Device pointer */
/* */
/* OUTPUT */
/* */
/* Status */
/* */
/* CALLS */
/* */
/* _ux_utility_semaphore_get Get semaphore */
/* _ux_host_stack_transfer_request Transfer request */
/* */
/* CALLED BY */
/* */
/* Application of HNP thread. */
/* */
/**************************************************************************/
UINT _ux_host_stack_role_swap(UX_DEVICE *device)
{
#if !defined(UX_OTG_SUPPORT)
UX_PARAMETER_NOT_USED(device);
return(UX_FUNCTION_NOT_SUPPORTED);
#else
UX_ENDPOINT *control_endpoint;
UX_TRANSFER *transfer_request;
UINT status;
/* Retrieve the control endpoint and the transfer request associated with it. */
control_endpoint = &device -> ux_device_control_endpoint;
transfer_request = &control_endpoint -> ux_endpoint_transfer_request;
/* Protect the control endpoint semaphore here. It will be unprotected in the
transfer request function. */
status = _ux_host_semaphore_get(&device -> ux_device_protection_semaphore, UX_WAIT_FOREVER);
/* Perform a SET_FEATURE on this device to inform the it we are ready to change role. */
transfer_request -> ux_transfer_request_requested_length = 0;
transfer_request -> ux_transfer_request_function = UX_SET_FEATURE;
transfer_request -> ux_transfer_request_type = UX_REQUEST_OUT | UX_REQUEST_TYPE_STANDARD | UX_REQUEST_TARGET_DEVICE;
transfer_request -> ux_transfer_request_value = UX_OTG_FEATURE_B_HNP_ENABLE;
transfer_request -> ux_transfer_request_index = 0;
/* Send request to HCD layer. */
status = _ux_host_stack_transfer_request(transfer_request);
/* If the status fails, simply ignore the command but do not proceed. */
if (status != UX_SUCCESS)
/* We have an error. Do not proceed. */
return(status);
/* Keep track of the event for HNP synchronization. */
_ux_system_otg -> ux_system_otg_change_mode_event = UX_OTG_HOST_TO_SLAVE;
/* Call the OTG function that will perform the swap. */
_ux_system_otg -> ux_system_otg_function(UX_OTG_HOST_TO_SLAVE);
/* Reset the event. */
_ux_system_otg -> ux_system_otg_change_mode_event = 0;
return(UX_SUCCESS);
#endif
}
|
