1 /***************************************************************************
2 * Copyright (c) 2024 Microsoft Corporation
3 *
4 * This program and the accompanying materials are made available under the
5 * terms of the MIT License which is available at
6 * https://opensource.org/licenses/MIT.
7 *
8 * SPDX-License-Identifier: MIT
9 **************************************************************************/
10
11
12 /**************************************************************************/
13 /**************************************************************************/
14 /** */
15 /** USBX Component */
16 /** */
17 /** Host Stack */
18 /** */
19 /**************************************************************************/
20 /**************************************************************************/
21
22
23 /* Include necessary system files. */
24
25 #define UX_SOURCE_CODE
26
27 #include "ux_api.h"
28 #include "ux_host_stack.h"
29
30
31 /**************************************************************************/
32 /* */
33 /* FUNCTION RELEASE */
34 /* */
35 /* _ux_host_stack_interface_set PORTABLE C */
36 /* 6.1.12 */
37 /* AUTHOR */
38 /* */
39 /* Chaoqiong Xiao, Microsoft Corporation */
40 /* */
41 /* DESCRIPTION */
42 /* */
43 /* This function performs a setting of an alternate setting for a */
44 /* specific interface. */
45 /* */
46 /* INPUT */
47 /* */
48 /* interface Pointer to interface */
49 /* */
50 /* OUTPUT */
51 /* */
52 /* Completion Status */
53 /* */
54 /* CALLS */
55 /* */
56 /* _ux_host_stack_hcd_transfer_request HCD transfer request */
57 /* */
58 /* CALLED BY */
59 /* */
60 /* USBX Components */
61 /* */
62 /* RELEASE HISTORY */
63 /* */
64 /* DATE NAME DESCRIPTION */
65 /* */
66 /* 05-19-2020 Chaoqiong Xiao Initial Version 6.0 */
67 /* 09-30-2020 Chaoqiong Xiao Modified comment(s), */
68 /* resulting in version 6.1 */
69 /* 01-31-2022 Chaoqiong Xiao Modified comment(s), */
70 /* added standalone support, */
71 /* resulting in version 6.1.10 */
72 /* 07-29-2022 Chaoqiong Xiao Modified comment(s), */
73 /* fixed parameter/variable */
74 /* names conflict C++ keyword, */
75 /* resulting in version 6.1.12 */
76 /* */
77 /**************************************************************************/
_ux_host_stack_interface_set(UX_INTERFACE * interface_ptr)78 UINT _ux_host_stack_interface_set(UX_INTERFACE *interface_ptr)
79 {
80
81 UX_DEVICE *device;
82 UX_CONFIGURATION *configuration;
83 UX_TRANSFER *transfer_request;
84 UINT status;
85 UX_ENDPOINT *control_endpoint;
86
87 /* If trace is enabled, insert this event into the trace buffer. */
88 UX_TRACE_IN_LINE_INSERT(UX_TRACE_HOST_STACK_INTERFACE_SET, interface_ptr, 0, 0, 0, UX_TRACE_HOST_STACK_EVENTS, 0, 0)
89
90 /* Retrieve the pointer to the control endpoint and its transfer_request.
91 From the interface we go back to the configuration, then the device.
92 The device contains the default control endpoint container. */
93 configuration = interface_ptr -> ux_interface_configuration;
94 device = configuration -> ux_configuration_device;
95 control_endpoint = &device -> ux_device_control_endpoint;
96 transfer_request = &control_endpoint -> ux_endpoint_transfer_request;
97
98 /* Create a transfer_request for the SET_INTERFACE request. No data for this request */
99 transfer_request -> ux_transfer_request_requested_length = 0;
100 transfer_request -> ux_transfer_request_function = UX_SET_INTERFACE;
101 transfer_request -> ux_transfer_request_type = UX_REQUEST_OUT | UX_REQUEST_TYPE_STANDARD | UX_REQUEST_TARGET_INTERFACE;
102 transfer_request -> ux_transfer_request_index = (USHORT) interface_ptr -> ux_interface_descriptor.bInterfaceNumber;
103 transfer_request -> ux_transfer_request_value = (USHORT) interface_ptr -> ux_interface_descriptor.bAlternateSetting;
104
105 /* Send request. */
106 status = _ux_host_stack_transfer_request(transfer_request);
107
108 /* Return status completion. */
109 return(status);
110 }
111
112
