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#include "include/ese/ese.h" 18#include "include/ese/log.h" 19 20#include "ese_private.h" 21 22static const char kUnknownHw[] = "unknown hw"; 23static const char kNullEse[] = "NULL EseInterface"; 24static const char *kEseErrorMessages[] = { 25 "Hardware supplied no transceive implementation.", 26 "Timed out polling for value.", 27}; 28#define ESE_MESSAGES(x) (sizeof(x) / sizeof((x)[0])) 29 30API const char *ese_name(const struct EseInterface *ese) { 31 if (!ese) { 32 return kNullEse; 33 } 34 if (ese->ops->name) { 35 return ese->ops->name; 36 } 37 return kUnknownHw; 38} 39 40API int ese_open(struct EseInterface *ese, void *hw_opts) { 41 if (!ese) { 42 return -1; 43 } 44 ALOGV("opening interface '%s'", ese_name(ese)); 45 if (ese->ops->open) { 46 return ese->ops->open(ese, hw_opts); 47 } 48 return 0; 49} 50 51API const char *ese_error_message(const struct EseInterface *ese) { 52 return ese->error.message; 53} 54 55API int ese_error_code(const struct EseInterface *ese) { 56 return ese->error.code; 57} 58 59API bool ese_error(const struct EseInterface *ese) { return ese->error.is_err; } 60 61API void ese_set_error(struct EseInterface *ese, int code) { 62 if (!ese) { 63 return; 64 } 65 /* Negative values are reserved for API wide messages. */ 66 ese->error.code = code; 67 ese->error.is_err = true; 68 if (code < 0) { 69 code = -(code + 1); /* Start at 0. */ 70 if ((uint32_t)(code) >= ESE_MESSAGES(kEseErrorMessages)) { 71 LOG_ALWAYS_FATAL("Unknown global error code passed to ese_set_error(%d)", 72 code); 73 } 74 ese->error.message = kEseErrorMessages[code]; 75 return; 76 } 77 if ((uint32_t)(code) >= ese->ops->errors_count) { 78 LOG_ALWAYS_FATAL("Unknown hw error code passed to ese_set_error(%d)", code); 79 } 80 ese->error.message = ese->ops->errors[code]; 81} 82 83/* Blocking. */ 84API int ese_transceive(struct EseInterface *ese, const uint8_t *tx_buf, 85 uint32_t tx_len, uint8_t *rx_buf, uint32_t rx_max) { 86 uint32_t recvd = 0; 87 if (!ese) { 88 return -1; 89 } 90 91 if (ese->ops->transceive) { 92 recvd = ese->ops->transceive(ese, tx_buf, tx_len, rx_buf, rx_max); 93 return ese_error(ese) ? -1 : recvd; 94 } 95 96 if (ese->ops->hw_transmit && ese->ops->hw_receive) { 97 ese->ops->hw_transmit(ese, tx_buf, tx_len, 1); 98 if (!ese_error(ese)) { 99 recvd = ese->ops->hw_receive(ese, rx_buf, rx_max, 1); 100 } 101 return ese_error(ese) ? -1 : recvd; 102 } 103 104 ese_set_error(ese, kEseGlobalErrorNoTransceive); 105 return -1; 106} 107 108API void ese_close(struct EseInterface *ese) { 109 if (!ese) { 110 return; 111 } 112 ALOGV("closing interface '%s'", ese_name(ese)); 113 if (!ese->ops->close) { 114 return; 115 } 116 ese->ops->close(ese); 117} 118