1 /* 2 * Copyright (C) 2017 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef ESE_HW_API_H_ 18 #define ESE_HW_API_H_ 1 19 20 #include "../../../libese-sysdeps/include/ese/sysdeps.h" 21 22 #ifdef __cplusplus 23 extern "C" { 24 #endif 25 /* 26 * Pulls the hardware declarations in to scope for the current file 27 * to make use of. 28 */ 29 #define __ESE_INCLUDE_HW(name) \ 30 extern const struct EseOperations * name## _ops 31 32 33 struct EseInterface; 34 35 /* ese_hw_receive_op_t: receives a buffer from the hardware. 36 * Args: 37 * - struct EseInterface *: session handle. 38 * - uint8_t *: pointer to the buffer to receive data into. 39 * - uint32_t: maximum length of the data to receive. 40 * - int: 1 or 0 indicating if it is a complete transaction. This allows the underlying 41 * implementation to batch reads if needed by the underlying wire protocol or if 42 * the hardware needs to be signalled explicitly. 43 * 44 * Returns: 45 * - uint32_t: bytes received. 46 */ 47 typedef uint32_t (ese_hw_receive_op_t)(struct EseInterface *, uint8_t *, uint32_t, int); 48 /* ese_hw_transmit_op_t: transmits a buffer over the hardware. 49 * Args: 50 * - struct EseInterface *: session handle. 51 * - uint8_t *: pointer to the buffer to transmit. 52 * - uint32_t: length of the data to transmit. 53 * - int: 1 or 0 indicating if it is a complete transaction. 54 * 55 * Returns: 56 * - uint32_t: bytes transmitted. 57 */ 58 typedef uint32_t (ese_hw_transmit_op_t)(struct EseInterface *, const uint8_t *, uint32_t, int); 59 /* ese_hw_reset_op_t: resets the hardware in case of communication desynchronization. 60 * Args: 61 * - struct EseInterface *: session handle. 62 * 63 * Returns: 64 * - int: -1 on error, 0 on success. 65 */ 66 typedef int (ese_hw_reset_op_t)(struct EseInterface *); 67 /* ese_transceive_op_t: fully contained transmission and receive operation. 68 * 69 * Must provide an implementation of the wire protocol necessary to transmit 70 * and receive an application payload to and from the eSE. Normally, this 71 * implementation is built on the hw_{receive,transmit} operations also 72 * provided and often requires the poll operation below. 73 * 74 * Args: 75 * - struct EseInterface *: session handle. 76 * - const uint8_t *: pointer to the buffer to transmit. 77 * - uint32_t: length of the data to transmit. 78 * - uint8_t *: pointer to the buffer to receive into. 79 * - uint32_t: maximum length of the data to receive. 80 * 81 * Returns: 82 * - uint32_t: bytes received. 83 */ 84 typedef uint32_t (ese_transceive_op_t)(struct EseInterface *, const uint8_t *, uint32_t, uint8_t *, uint32_t); 85 /* ese_poll_op_t: waits for the hardware to be ready to send data. 86 * 87 * Args: 88 * - struct EseInterface *: session handle. 89 * - uint8_t: byte to wait for. E.g., a start of frame byte. 90 * - float: time in seconds to wait. 91 * - int: whether to complete a transaction when polling s complete. 92 * 93 * Returns: 94 * - int: On error or timeout, -1. 95 * On success, 1 or 0 depending on if the found byte was consumed. 96 */ 97 typedef int (ese_poll_op_t)(struct EseInterface *, uint8_t, float, int); 98 /* ese_hw_open_op_t: prepares the hardware for use. 99 * 100 * This function should prepare the hardware for use and attach 101 * any implementation specific state to the EseInterface handle such 102 * that it is accessible in the other calls. 103 * 104 * Args: 105 * - struct EseInterface *: freshly initialized session handle. 106 * - void *: implementation specific pointer from the libese client. 107 * 108 * Returns: 109 * - int: < 0 on error, 0 on success. 110 */ 111 typedef int (ese_open_op_t)(struct EseInterface *, void *); 112 /* ese_hw_close_op_t: releases the hardware in use. 113 * 114 * This function should free any dynamic memory and release 115 * the claimed hardware. 116 * 117 * Args: 118 * - struct EseInterface *: freshly initialized session handle. 119 * 120 * Returns: 121 * - Nothing. 122 */ 123 typedef void (ese_close_op_t)(struct EseInterface *); 124 125 #define __ESE_INITIALIZER(TYPE) \ 126 { \ 127 .ops = TYPE## _ops, \ 128 .pad = { 0 }, \ 129 } 130 131 #define __ese_init(_ptr, TYPE) {\ 132 _ptr->ops = TYPE## _ops; \ 133 _ptr->pad[0] = 0; \ 134 } 135 136 struct EseOperations { 137 const char *const name; 138 /* Used to prepare any implementation specific internal data and 139 * state needed for robust communication. 140 */ 141 ese_open_op_t *const open; 142 /* Used to receive raw data from the ese. */ 143 ese_hw_receive_op_t *const hw_receive; 144 /* Used to transmit raw data to the ese. */ 145 ese_hw_transmit_op_t *const hw_transmit; 146 /* Used to perform a power reset on the device. */ 147 ese_hw_reset_op_t *const hw_reset; 148 /* Wire-specific protocol polling for readiness. */ 149 ese_poll_op_t *const poll; 150 /* Wire-specific protocol for transmitting and receiving 151 * application data to the eSE. By default, this may point to 152 * a generic implementation, like teq1_transceive, which uses 153 * the hw_* ops above. 154 */ 155 ese_transceive_op_t *const transceive; 156 /* Cleans up any required state: file descriptors or heap allocations. */ 157 ese_close_op_t *const close; 158 159 /* Operational options */ 160 const void *const opts; 161 162 /* Operation error messages. */ 163 const char **errors; 164 const uint32_t errors_count; 165 }; 166 167 /* Maximum private stack storage on the interface instance. */ 168 #define ESE_INTERFACE_STATE_PAD 16 169 struct EseInterface { 170 const struct EseOperations * ops; 171 struct { 172 bool is_err; 173 int code; 174 const char *message; 175 } error; 176 /* Reserved to avoid heap allocation requirement. */ 177 uint8_t pad[ESE_INTERFACE_STATE_PAD]; 178 }; 179 180 /* 181 * Provided by libese to manage exposing usable errors up the stack to the 182 * libese user. 183 */ 184 void ese_set_error(struct EseInterface *ese, int code); 185 186 /* 187 * Global error enums. 188 */ 189 enum EseGlobalError { 190 kEseGlobalErrorNoTransceive = -1, 191 kEseGlobalErrorPollTimedOut = -2, 192 }; 193 194 #define ESE_DEFINE_HW_OPS(name, obj) \ 195 const struct EseOperations * name##_ops = &obj 196 197 198 #ifdef __cplusplus 199 } /* extern "C" */ 200 #endif 201 #endif /* ESE_HW_API_H_ */ 202
