1 /**************************************************************************/ 2 /* */ 3 /* Copyright (c) Microsoft Corporation. All rights reserved. */ 4 /* */ 5 /* This software is licensed under the Microsoft Software License */ 6 /* Terms for Microsoft Azure RTOS. Full text of the license can be */ 7 /* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */ 8 /* and in the root directory of this software. */ 9 /* */ 10 /**************************************************************************/ 11 12 /**************************************************************************/ 13 /**************************************************************************/ 14 /** */ 15 /** USBX Component */ 16 /** */ 17 /** Device RNDIS Class */ 18 /** */ 19 /**************************************************************************/ 20 /**************************************************************************/ 21 22 #define UX_SOURCE_CODE 23 24 25 /* Include necessary system files. */ 26 27 #include "ux_api.h" 28 #include "ux_device_class_rndis.h" 29 #include "ux_device_stack.h" 30 31 32 /**************************************************************************/ 33 /* */ 34 /* FUNCTION RELEASE */ 35 /* */ 36 /* _ux_device_class_rndis_write PORTABLE C */ 37 /* 6.1.11 */ 38 /* AUTHOR */ 39 /* */ 40 /* Chaoqiong Xiao, Microsoft Corporation */ 41 /* */ 42 /* DESCRIPTION */ 43 /* */ 44 /* This function writes a packet into a queue for later thread */ 45 /* processing. */ 46 /* */ 47 /* INPUT */ 48 /* */ 49 /* rndis Address of rndis class */ 50 /* instance */ 51 /* */ 52 /* OUTPUT */ 53 /* */ 54 /* None */ 55 /* */ 56 /* CALLS */ 57 /* */ 58 /* _ux_device_mutex_on Take mutex */ 59 /* _ux_device_mutex_off Free mutex */ 60 /* _ux_device_event_flags_set Set event flags */ 61 /* */ 62 /* CALLED BY */ 63 /* */ 64 /* ThreadX */ 65 /* */ 66 /* RELEASE HISTORY */ 67 /* */ 68 /* DATE NAME DESCRIPTION */ 69 /* */ 70 /* 05-19-2020 Chaoqiong Xiao Initial Version 6.0 */ 71 /* 09-30-2020 Chaoqiong Xiao Modified comment(s), */ 72 /* used UX prefix to refer to */ 73 /* TX symbols instead of using */ 74 /* them directly, */ 75 /* resulting in version 6.1 */ 76 /* 04-25-2022 Chaoqiong Xiao Modified comment(s), */ 77 /* fixed standalone compile, */ 78 /* resulting in version 6.1.11 */ 79 /* */ 80 /**************************************************************************/ _ux_device_class_rndis_write(VOID * rndis_class,NX_PACKET * packet)81UINT _ux_device_class_rndis_write(VOID *rndis_class, NX_PACKET *packet) 82 { 83 #if defined(UX_DEVICE_STANDALONE) 84 UX_PARAMETER_NOT_USED(rndis_class); 85 UX_PARAMETER_NOT_USED(packet); 86 return(UX_FUNCTION_NOT_SUPPORTED); 87 #else 88 89 NX_PACKET *current_packet; 90 NX_PACKET *next_packet; 91 UX_SLAVE_CLASS_RNDIS *rndis; 92 93 /* Proper class casting. */ 94 rndis = (UX_SLAVE_CLASS_RNDIS *) rndis_class; 95 96 /* Protect this thread. */ 97 _ux_device_mutex_on(&rndis -> ux_slave_class_rndis_mutex); 98 99 /* Check the queue. See if there is something that is being sent. */ 100 if (rndis -> ux_slave_class_rndis_xmit_queue == UX_NULL) 101 102 /* Memorize this packet at the beginning of the queue. */ 103 rndis -> ux_slave_class_rndis_xmit_queue = packet; 104 105 else 106 107 { 108 109 /* We get here when there is something in the queue. */ 110 current_packet = rndis -> ux_slave_class_rndis_xmit_queue; 111 112 /* Get the next packet associated with the first packet. */ 113 next_packet = current_packet -> nx_packet_queue_next; 114 115 /* Parse the current chain for the end. */ 116 while (next_packet != NX_NULL) 117 { 118 /* Remember the current packet. */ 119 current_packet = next_packet; 120 121 /* See what the next packet in the chain is. */ 122 next_packet = current_packet -> nx_packet_queue_next; 123 } 124 125 /* Memorize the packet to be sent. */ 126 current_packet -> nx_packet_queue_next = packet; 127 128 } 129 130 /* Free Mutex resource. */ 131 _ux_device_mutex_off(&rndis -> ux_slave_class_rndis_mutex); 132 133 /* The packet to be sent is the last in the chain. */ 134 packet -> nx_packet_queue_next = NX_NULL; 135 136 /* Set an event to wake up the bulkin thread. */ 137 _ux_device_event_flags_set(&rndis -> ux_slave_class_rndis_event_flags_group, UX_DEVICE_CLASS_RNDIS_NEW_BULKIN_EVENT, UX_OR); 138 139 /* We are done here. */ 140 return(UX_SUCCESS); 141 #endif 142 } 143
