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 /** */ 16 /** USBX Component */ 17 /** */ 18 /** Host Simulator Controller Driver */ 19 /** */ 20 /**************************************************************************/ 21 /**************************************************************************/ 22 23 #define UX_SOURCE_CODE 24 25 26 /* Include necessary system files. */ 27 28 #include "ux_api.h" 29 #include "ux_hcd_sim_host.h" 30 31 32 /**************************************************************************/ 33 /* */ 34 /* FUNCTION RELEASE */ 35 /* */ 36 /* _ux_hcd_sim_host_periodic_endpoint_destroy PORTABLE C */ 37 /* 6.1 */ 38 /* AUTHOR */ 39 /* */ 40 /* Chaoqiong Xiao, Microsoft Corporation */ 41 /* */ 42 /* DESCRIPTION */ 43 /* */ 44 /* This function will destroy an interrupt or isochronous endpoint. */ 45 /* */ 46 /* INPUT */ 47 /* */ 48 /* hcd_sim_host Pointer to host controller */ 49 /* endpoint Pointer to endpoint */ 50 /* */ 51 /* OUTPUT */ 52 /* */ 53 /* Completion Status */ 54 /* */ 55 /* CALLS */ 56 /* */ 57 /* None */ 58 /* */ 59 /* CALLED BY */ 60 /* */ 61 /* Host Simulator Controller Driver */ 62 /* */ 63 /* RELEASE HISTORY */ 64 /* */ 65 /* DATE NAME DESCRIPTION */ 66 /* */ 67 /* 05-19-2020 Chaoqiong Xiao Initial Version 6.0 */ 68 /* 09-30-2020 Chaoqiong Xiao Modified comment(s), */ 69 /* resulting in version 6.1 */ 70 /* */ 71 /**************************************************************************/ _ux_hcd_sim_host_periodic_endpoint_destroy(UX_HCD_SIM_HOST * hcd_sim_host,UX_ENDPOINT * endpoint)72UINT _ux_hcd_sim_host_periodic_endpoint_destroy(UX_HCD_SIM_HOST *hcd_sim_host, UX_ENDPOINT *endpoint) 73 { 74 75 UX_HCD_SIM_HOST_ED *ed; 76 UX_HCD_SIM_HOST_ED *previous_ed; 77 UX_HCD_SIM_HOST_ED *next_ed; 78 UX_HCD_SIM_HOST_TD *td; 79 80 81 /* From the endpoint container fetch the host simulator ED descriptor. */ 82 ed = (UX_HCD_SIM_HOST_ED *) endpoint -> ux_endpoint_ed; 83 84 /* Get the previous ED in the list for this ED. */ 85 previous_ed = ed -> ux_sim_host_ed_previous_ed; 86 87 /* Get the next ED in the list for this ED. */ 88 next_ed = ed -> ux_sim_host_ed_next_ed; 89 90 /* The previous ED points now to the ED after the ED we are removing. */ 91 if (previous_ed) 92 previous_ed -> ux_sim_host_ed_next_ed = next_ed; 93 94 /* Update the previous ED pointer in the next ED. */ 95 if (next_ed) 96 next_ed -> ux_sim_host_ed_previous_ed = previous_ed; 97 98 /* We need to free the dummy TD that was attached to the ED. */ 99 td = ed -> ux_sim_host_ed_tail_td; 100 td -> ux_sim_host_td_status = UX_UNUSED; 101 102 /* Now we can safely make the ED free. */ 103 ed -> ux_sim_host_ed_status = UX_UNUSED; 104 105 /* Decrement the number of interrupt endpoints active. When the counter 106 reaches 0, the periodic scheduler will be turned off. */ 107 hcd_sim_host -> ux_hcd_sim_host_periodic_scheduler_active--; 108 109 /* Return successful completion. */ 110 return(UX_SUCCESS); 111 } 112 113
