1 /* 2 * Copyright (C) 2010 NXP Semiconductors 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 /** 18 * \file phDalNfc_i2c.c 19 * \brief DAL I2C port implementation for linux 20 * 21 * Project: Trusted NFC Linux 22 * 23 */ 24 25 #define LOG_TAG "NFC_i2c" 26 #include <utils/Log.h> 27 28 #include <stdlib.h> 29 #include <unistd.h> 30 #include <fcntl.h> 31 #include <termios.h> 32 #include <sys/ioctl.h> 33 #include <sys/select.h> 34 35 #include <phDal4Nfc_debug.h> 36 #include <phDal4Nfc_i2c.h> 37 #include <phOsalNfc.h> 38 #include <phNfcStatus.h> 39 #if defined(ANDROID) 40 #include <string.h> 41 #endif 42 43 #include <linux/pn544.h> 44 45 typedef struct 46 { 47 int nHandle; 48 char nOpened; 49 50 } phDal4Nfc_I2cPortContext_t; 51 52 53 /*----------------------------------------------------------------------------------- 54 VARIABLES 55 ------------------------------------------------------------------------------------*/ 56 static phDal4Nfc_I2cPortContext_t gI2cPortContext; 57 58 59 60 /*----------------------------------------------------------------------------- 61 62 FUNCTION: phDal4Nfc_i2c_set_open_from_handle 63 64 PURPOSE: Initialize internal variables 65 66 -----------------------------------------------------------------------------*/ 67 68 void phDal4Nfc_i2c_initialize(void) 69 { 70 memset(&gI2cPortContext, 0, sizeof(phDal4Nfc_I2cPortContext_t)); 71 } 72 73 74 /*----------------------------------------------------------------------------- 75 76 FUNCTION: phDal4Nfc_i2c_set_open_from_handle 77 78 PURPOSE: The application could have opened the link itself. So we just need 79 to get the handle and consider that the open operation has already 80 been done. 81 82 -----------------------------------------------------------------------------*/ 83 84 void phDal4Nfc_i2c_set_open_from_handle(phHal_sHwReference_t * pDalHwContext) 85 { 86 gI2cPortContext.nHandle = (int) pDalHwContext->p_board_driver; 87 DAL_ASSERT_STR(gI2cPortContext.nHandle >= 0, "Bad passed com port handle"); 88 gI2cPortContext.nOpened = 1; 89 } 90 91 /*----------------------------------------------------------------------------- 92 93 FUNCTION: phDal4Nfc_i2c_is_opened 94 95 PURPOSE: Returns if the link is opened or not. (0 = not opened; 1 = opened) 96 97 -----------------------------------------------------------------------------*/ 98 99 int phDal4Nfc_i2c_is_opened(void) 100 { 101 return gI2cPortContext.nOpened; 102 } 103 104 /*----------------------------------------------------------------------------- 105 106 FUNCTION: phDal4Nfc_i2c_flush 107 108 PURPOSE: Flushes the link ; clears the link buffers 109 110 -----------------------------------------------------------------------------*/ 111 112 void phDal4Nfc_i2c_flush(void) 113 { 114 /* Nothing to do (driver has no internal buffers) */ 115 } 116 117 /*----------------------------------------------------------------------------- 118 119 FUNCTION: phDal4Nfc_i2c_close 120 121 PURPOSE: Closes the link 122 123 -----------------------------------------------------------------------------*/ 124 125 void phDal4Nfc_i2c_close(void) 126 { 127 DAL_PRINT("Closing port\n"); 128 if (gI2cPortContext.nOpened == 1) 129 { 130 close(gI2cPortContext.nHandle); 131 gI2cPortContext.nHandle = 0; 132 gI2cPortContext.nOpened = 0; 133 } 134 } 135 136 /*----------------------------------------------------------------------------- 137 138 FUNCTION: phDal4Nfc_i2c_open_and_configure 139 140 PURPOSE: Closes the link 141 142 -----------------------------------------------------------------------------*/ 143 144 NFCSTATUS phDal4Nfc_i2c_open_and_configure(pphDal4Nfc_sConfig_t pConfig, void ** pLinkHandle) 145 { 146 char * pComPort; 147 148 DAL_ASSERT_STR(gI2cPortContext.nOpened==0, "Trying to open but already done!"); 149 150 switch(pConfig->nLinkType) 151 { 152 case ENUM_DAL_LINK_TYPE_I2C: 153 pComPort = "/dev/pn544"; 154 break; 155 default: 156 DAL_DEBUG("Open failed: unknown type %d\n", pConfig->nLinkType); 157 return NFCSTATUS_INVALID_PARAMETER; 158 } 159 160 DAL_DEBUG("Opening port=%s\n", pComPort); 161 162 /* open port */ 163 gI2cPortContext.nHandle = open(pComPort, O_RDWR | O_NOCTTY); 164 if (gI2cPortContext.nHandle < 0) 165 { 166 DAL_DEBUG("Open failed: open() returned %d\n", gI2cPortContext.nHandle); 167 *pLinkHandle = NULL; 168 return PHNFCSTVAL(CID_NFC_DAL, NFCSTATUS_INVALID_DEVICE); 169 } 170 171 gI2cPortContext.nOpened = 1; 172 *pLinkHandle = (void*)gI2cPortContext.nHandle; 173 174 DAL_PRINT("Open succeed\n"); 175 176 return NFCSTATUS_SUCCESS; 177 } 178 179 180 /*----------------------------------------------------------------------------- 181 182 FUNCTION: phDal4Nfc_i2c_read 183 184 PURPOSE: Reads nNbBytesToRead bytes and writes them in pBuffer. 185 Returns the number of bytes really read or -1 in case of error. 186 187 -----------------------------------------------------------------------------*/ 188 189 int phDal4Nfc_i2c_read(uint8_t * pBuffer, int nNbBytesToRead) 190 { 191 int ret; 192 DAL_ASSERT_STR(gI2cPortContext.nOpened == 1, "read called but not opened!"); 193 194 DAL_DEBUG("Reading %d bytes\n", nNbBytesToRead); 195 ret = read(gI2cPortContext.nHandle, pBuffer, nNbBytesToRead); 196 if (ret < 0) 197 { 198 DAL_DEBUG("Read failed: read() returned %d\n", ret); 199 } 200 else 201 { 202 DAL_DEBUG("Read succeed (%d bytes)\n", ret); 203 } 204 return ret; 205 } 206 207 /*----------------------------------------------------------------------------- 208 209 FUNCTION: phDal4Nfc_i2c_write 210 211 PURPOSE: Writes nNbBytesToWrite bytes from pBuffer to the link 212 Returns the number of bytes that have been wrote to the interface or -1 in case of error. 213 214 -----------------------------------------------------------------------------*/ 215 216 int phDal4Nfc_i2c_write(uint8_t * pBuffer, int nNbBytesToWrite) 217 { 218 int ret; 219 DAL_ASSERT_STR(gI2cPortContext.nOpened == 1, "write called but not opened!"); 220 221 DAL_DEBUG("Writing %d bytes\n", nNbBytesToWrite); 222 ret = write(gI2cPortContext.nHandle, pBuffer, nNbBytesToWrite); 223 if (ret < 0) 224 { 225 DAL_DEBUG("Write failed: write() returned %d \n", ret); 226 } 227 else 228 { 229 DAL_DEBUG("Write succeed (%d bytes)\n", ret); 230 } 231 return ret; 232 } 233 234 235 /*----------------------------------------------------------------------------- 236 237 FUNCTION: phDal4Nfc_i2c_reset 238 239 PURPOSE: Reset the PN544, using the VEN pin 240 241 -----------------------------------------------------------------------------*/ 242 int phDal4Nfc_i2c_reset(long level) 243 { 244 int ret = NFCSTATUS_SUCCESS; 245 246 DAL_DEBUG("phDal4Nfc_i2c_reset, VEN level = %ld",level); 247 248 ret = ioctl(gI2cPortContext.nHandle, PN544_SET_PWR, level); 249 250 /* HACK to increase reset time 251 * TODO: move this to kernel 252 */ 253 if (level == 0) { 254 LOGW("sleeping a little longer..."); 255 usleep(50000); 256 } else { 257 usleep(10000); 258 } 259 260 return ret; 261 } 262 263 264 265 266 267
