/** ---------------------------------------------------------------------- * * Copyright (C) 2013 ST Microelectronics S.A. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * * ----------------------------------------------------------------------*/ #define _GNU_SOURCE #include #include #include #include #include /* not required for all builds */ #include #include #include #include #include #include #include #include #include "halcore.h" #include "halcore_private.h" #include "android_logmsg.h" #define ST21NFC_MAGIC 0xEA #define ST21NFC_GET_WAKEUP _IOR(ST21NFC_MAGIC, 0x01, unsigned int) #define ST21NFC_PULSE_RESET _IOR(ST21NFC_MAGIC, 0x02, unsigned int) #define ST21NFC_SET_POLARITY_RISING _IOR(ST21NFC_MAGIC, 0x03, unsigned int) #define ST21NFC_SET_POLARITY_FALLING _IOR(ST21NFC_MAGIC, 0x04, unsigned int) #define ST21NFC_SET_POLARITY_HIGH _IOR(ST21NFC_MAGIC, 0x05, unsigned int) #define ST21NFC_SET_POLARITY_LOW _IOR(ST21NFC_MAGIC, 0x06, unsigned int) #define LINUX_DBGBUFFER_SIZE 300 static int fidI2c = 0; static int cmdPipe[2] = {0, 0}; static struct pollfd event_table[2]; static pthread_t threadHandle = (pthread_t)NULL; pthread_mutex_t i2ctransport_mtx = PTHREAD_MUTEX_INITIALIZER; /************************************************************************************************** * * Private API Declaration * **************************************************************************************************/ static int i2cSetPolarity(int fid, bool low, bool edge); static int i2cResetPulse(int fid); static int i2cRead(int fid, uint8_t* pvBuffer, int length); static int i2cGetGPIOState(int fid); static int i2cWrite(int fd, const uint8_t* pvBuffer, int length); /************************************************************************************************** * * Public API Entry-Points * **************************************************************************************************/ /** * Worker thread for I2C data processing. * On exit of this thread, destroy the HAL thread instance. * @param arg Handle of the HAL layer */ static void* I2cWorkerThread(void* arg) { bool closeThread = false; HALHANDLE hHAL = (HALHANDLE)arg; STLOG_HAL_V("echo thread started...\n"); bool readOk= false; do { event_table[0].fd = fidI2c; event_table[0].events = POLLIN; event_table[0].revents = 0; event_table[1].fd = cmdPipe[0]; event_table[1].events = POLLIN; event_table[1].revents = 0; STLOG_HAL_D("echo thread go to sleep...\n"); int poll_status = poll(event_table, 2, -1); if (-1 == poll_status) { STLOG_HAL_E("error in poll call\n"); return 0; } if (event_table[0].revents & POLLIN) { STLOG_HAL_D("echo thread wakeup from chip...\n"); uint8_t buffer[300]; do { // load first four bytes: int bytesRead = i2cRead(fidI2c, buffer, 3); if (bytesRead == 3) { if ((buffer[0] != 0x7E) && (buffer[1] != 0x7E)) { readOk = true; } else { if (buffer[1] != 0x7E) { STLOG_HAL_W("Idle data: 2nd byte is 0x%02x\n, reading next 2 bytes", buffer[1]); buffer[0] = buffer[1]; buffer[1] = buffer[2]; bytesRead = i2cRead(fidI2c, buffer + 2, 1); if (bytesRead == 1) { readOk = true; } } else if (buffer[2] != 0x7E) { STLOG_HAL_W("Idle data: 3rd byte is 0x%02x\n, reading next byte", buffer[2]); buffer[0] = buffer[2]; bytesRead = i2cRead(fidI2c, buffer + 1, 2); if (bytesRead == 2) { readOk = true; } } else { STLOG_HAL_W("received idle data\n"); } } if (readOk == true) { int remaining = buffer[2]; // read and pass to HALCore bytesRead = i2cRead(fidI2c, buffer + 3, remaining); if (bytesRead == remaining) { DispHal("RX DATA", buffer, 3 + bytesRead); HalSendUpstream(hHAL, buffer, 3 + bytesRead); } else { readOk = false; STLOG_HAL_E("! didn't read expected bytes from i2c\n"); } } } else { STLOG_HAL_E("! didn't read 3 requested bytes from i2c\n"); } readOk = false; memset(buffer, 0xca, sizeof(buffer)); /* read while we have data available */ } while (i2cGetGPIOState(fidI2c) == 1); } if (event_table[1].revents & POLLIN) { STLOG_HAL_V("thread received command.. \n"); char cmd = 0; read(cmdPipe[0], &cmd, 1); switch (cmd) { case 'X': STLOG_HAL_D("received close command\n"); closeThread = true; break; case 'W': { size_t length; uint8_t buffer[MAX_BUFFER_SIZE]; STLOG_HAL_V("received write command\n"); read(cmdPipe[0], &length, sizeof(length)); if (length <= MAX_BUFFER_SIZE) { read(cmdPipe[0], buffer, length); i2cWrite(fidI2c, buffer, length); } else { STLOG_HAL_E("! received bigger data than expected!! Data not transmitted to NFCC \n"); size_t bytes_read = 1; // Read all the data to empty but do not use it as not expected while((bytes_read > 0) && (length > 0)) { bytes_read = read(cmdPipe[0],buffer,MAX_BUFFER_SIZE); length = length - bytes_read; } } } break; } } } while (!closeThread); close(fidI2c); close(cmdPipe[0]); close(cmdPipe[1]); HalDestroy(hHAL); STLOG_HAL_D("thread exit\n"); return 0; } /** * Put command into queue for worker thread to process it. * @param x Command 'X' to close I2C layer or 'W' to write data down to I2C * layer followed by data frame * @param len Size of command or data * @return */ int I2cWriteCmd(const uint8_t* x, size_t len) { return write(cmdPipe[1], x, len); } /** * Initialize the I2C layer. * @param dev NFC NCI device context, NFC callbacks for control/data, HAL handle * @param callb HAL Core callback upon reception on I2C * @param pHandle HAL context handle */ bool I2cOpenLayer(void* dev, HAL_CALLBACK callb, HALHANDLE* pHandle) { uint32_t NoDbgFlag = HAL_FLAG_DEBUG; (void) pthread_mutex_lock(&i2ctransport_mtx); fidI2c = open("/dev/st21nfc", O_RDWR); if (fidI2c < 0) { STLOG_HAL_W("unable to open /dev/st21nfc\n"); return false; } i2cSetPolarity(fidI2c, false, true); i2cResetPulse(fidI2c); if ((pipe(cmdPipe) == -1)) { STLOG_HAL_W("unable to open cmdpipe\n"); return false; } *pHandle = HalCreate(dev, callb, NoDbgFlag); if (!*pHandle) { STLOG_HAL_E("failed to create NFC HAL Core \n"); return false; } (void) pthread_mutex_unlock(&i2ctransport_mtx); return (pthread_create(&threadHandle, NULL, I2cWorkerThread, *pHandle) == 0); } /** * Terminates the I2C layer. */ void I2cCloseLayer() { uint8_t cmd = 'X'; int ret; ALOGD("%s: enter\n", __func__); (void)pthread_mutex_lock(&i2ctransport_mtx); if (threadHandle == (pthread_t)NULL) return; I2cWriteCmd(&cmd, sizeof(cmd)); /* wait for terminate */ ret = pthread_join(threadHandle,(void**)NULL); if (ret != 0) { ALOGE("%s: failed to wait for thread (%d)", __func__, ret); } threadHandle = (pthread_t)NULL; (void)pthread_mutex_unlock(&i2ctransport_mtx); } /************************************************************************************************** * * Private API Definition * **************************************************************************************************/ /** * Call the st21nfc driver to adjust wake-up polarity. * @param fid File descriptor for NFC device * @param low Polarity (HIGH or LOW) * @param edge Polarity (RISING or FALLING) * @return Result of IOCTL system call (0 if ok) */ static int i2cSetPolarity(int fid, bool low, bool edge) { int result; unsigned int io_code; if (low) { if (edge) { io_code = ST21NFC_SET_POLARITY_FALLING; } else { io_code = ST21NFC_SET_POLARITY_LOW; } } else { if (edge) { io_code = ST21NFC_SET_POLARITY_RISING; } else { io_code = ST21NFC_SET_POLARITY_HIGH; } } if (-1 == (result = ioctl(fid, io_code, NULL))) { result = -1; } return result; } /* i2cSetPolarity*/ /** * Call the st21nfc driver to generate a 30ms pulse on RESET line. * @param fid File descriptor for NFC device * @return Result of IOCTL system call (0 if ok) */ static int i2cResetPulse(int fid) { int result; if (-1 == (result = ioctl(fid, ST21NFC_PULSE_RESET, NULL))) { result = -1; } STLOG_HAL_D("! i2cResetPulse!!, result = %d", result); return result; } /* i2cResetPulse*/ /** * Write data to st21nfc, on failure do max 3 retries. * @param fid File descriptor for NFC device * @param pvBuffer Data to write * @param length Data size * @return 0 if bytes written, -1 if error */ static int i2cWrite(int fid, const uint8_t* pvBuffer, int length) { int retries = 0; int result = 0; while (retries < 3) { result = write(fid, pvBuffer, length); if (result < 0) { char msg[LINUX_DBGBUFFER_SIZE]; strerror_r(errno, msg, LINUX_DBGBUFFER_SIZE); STLOG_HAL_W("! i2cWrite!!, errno is '%s'", msg); usleep(4000); retries++; } else if (result > 0) { result = 0; return result; } else { STLOG_HAL_W("write on i2c failed, retrying\n"); usleep(4000); retries++; } } return -1; } /* i2cWrite */ /** * Read data from st21nfc, on failure do max 3 retries. * * @param fid File descriptor for NFC device * @param pvBuffer Buffer where to copy read data * @param length Data size to read * @return Length of read data, -1 if error */ static int i2cRead(int fid, uint8_t* pvBuffer, int length) { int retries = 0; int result = -1; while ((retries < 3) && (result < 0)) { result = read(fid, pvBuffer, length); if (result == -1) { int e = errno; if (e == EAGAIN) { /* File is nonblocking, and no data is available. * This is not an error condition! */ result = 0; STLOG_HAL_D("## i2cRead - got EAGAIN. No data available. return 0 bytes"); } else { /* unexpected result */ char msg[LINUX_DBGBUFFER_SIZE]; strerror_r(e, msg, LINUX_DBGBUFFER_SIZE); STLOG_HAL_W("## i2cRead returns %d errno %d (%s)", result, e, msg); } } if (result < 0) { if (retries < 3) { /* delays are different and increasing for the three retries. */ static const uint8_t delayTab[] = {2, 3, 5}; int delay = delayTab[retries]; retries++; STLOG_HAL_W("## i2cRead retry %d/3 in %d milliseconds.", retries, delay); usleep(delay * 1000); continue; } } } return result; } /* i2cRead */ /** * Get the activation status of wake-up pin from st21nfc. * The decision 'active' depends on selected polarity. * The decision is handled inside the driver(st21nfc). * @param fid File descriptor for NFC device * @return * Result < 0: Error condition * Result > 0: Pin active * Result = 0: Pin not active */ static int i2cGetGPIOState(int fid) { int result; if (-1 == (result = ioctl(fid, ST21NFC_GET_WAKEUP, NULL))) { result = -1; } return result; } /* i2cGetGPIOState */