text: /*
   * Author: Brendan Le Foll <brendan.le.foll@intel.com>
   * Author: Thomas Ingleby <thomas.c.ingleby@intel.com>
   * Copyright (c) 2014-2016 Intel Corporation.
   *
   * SPDX-License-Identifier: MIT
   */
  
  #define _GNU_SOURCE
  #if !defined(_XOPEN_SOURCE) || _XOPEN_SOURCE < 600
  #define _XOPEN_SOURCE 600 /* Get nftw() and S_IFSOCK declarations */
  #endif
  
  #include <dlfcn.h>
  #include <pwd.h>
  #include <sched.h>
  #include <stddef.h>
  #include <stdlib.h>
  #include <string.h>
  #if !defined(PERIPHERALMAN)
  #include <ftw.h>
  #include <glob.h>
  #endif
  #include <ctype.h>
  #include <dirent.h>
  #include <errno.h>
  #include <fcntl.h>
  #include <limits.h>
  #include <stdbool.h>
  #include <stdio.h>
  #include <sys/utsname.h>
  #include <unistd.h>
  
  #if defined(IMRAA)
  #include <json-c/json.h>
  #include <sys/mman.h>
  #include <sys/stat.h>
  #endif
  
  #include "aio.h"
  #include "firmata/firmata_mraa.h"
  #include "gpio.h"
  #include "gpio/gpio_chardev.h"
  #include "grovepi/grovepi.h"
  #include "i2c.h"
  #include "mraa_internal.h"
  #include "pwm.h"
  #include "spi.h"
  #include "uart.h"
  #include "version.h"
  
  #if defined(PERIPHERALMAN)
  #include "peripheralmanager/peripheralman.h"
  #else
  #define IIO_DEVICE_WILDCARD "iio:device*"
  
  mraa_iio_info_t* plat_iio = NULL;
  
  static int num_i2c_devices = 0;
  static int num_iio_devices = 0;
  #endif
  
  mraa_board_t* plat = NULL;
  mraa_lang_func_t* lang_func = NULL;
  
  char* platform_name = NULL;
  
  const char*
  mraa_get_version()
  {
      return gVERSION;
  }
  
  mraa_result_t
  mraa_set_log_level(int level)
  {
      if (level <= 7 && level >= 0) {
          setlogmask(LOG_UPTO(level));
          syslog(LOG_DEBUG, "Loglevel %d is set", level);
          return MRAA_SUCCESS;
      }
      syslog(LOG_NOTICE, "Invalid loglevel %d requested", level);
      return MRAA_ERROR_INVALID_PARAMETER;
  }
  
  mraa_boolean_t
  mraa_is_kernel_chardev_interface_compatible()
  {
      if (mraa_get_number_of_gpio_chips() <= 0) {
          syslog(LOG_NOTICE,
                 "gpio: platform supports chardev but kernel doesn't, falling back to sysfs");
          return 0;
      }
  
      return 1;
  }
  
  mraa_boolean_t
  mraa_is_platform_chardev_interface_capable()
  {
      if ((plat != NULL) && (plat->chardev_capable)) {
          return mraa_is_kernel_chardev_interface_compatible();
      }
  
      syslog(LOG_NOTICE, "gpio: platform doesn't support chardev, falling back to sysfs");
      return 0;
  }
  
  /**
   * Whilst the actual mraa init function is now called imraa_init, it's only
   * callable externally if IMRAA is enabled
   */
  mraa_result_t
  imraa_init()
  {
      if (plat != NULL) {
          return MRAA_SUCCESS;
      }
      char* env_var;
      mraa_platform_t platform_type = MRAA_NULL_PLATFORM;
      uid_t proc_euid = geteuid();
      struct passwd* proc_user = getpwuid(proc_euid);
  
  #ifdef DEBUG
      setlogmask(LOG_UPTO(LOG_DEBUG));
  #else
      setlogmask(LOG_UPTO(LOG_NOTICE));
  #endif
  
      openlog("libmraa", LOG_CONS | LOG_PID | LOG_NDELAY, LOG_LOCAL1);
      syslog(LOG_NOTICE, "libmraa version %s initialised by user '%s' with EUID %d",
             mraa_get_version(), (proc_user != NULL) ? proc_user->pw_name : "<unknown>", proc_euid);
  
      // Check to see if the enviroment variable has been set
      env_var = getenv(MRAA_JSONPLAT_ENV_VAR);
      if (env_var != NULL) {
          // We only care about success, the init will write to syslog if things went wrong
          switch (mraa_init_json_platform(env_var)) {
              case MRAA_SUCCESS:
                  platform_type = plat->platform_type;
                  break;
              default:
                  syslog(LOG_NOTICE, "libmraa was unable to initialise a platform from json");
          }
      }
  
      // Not an else because if the env var didn't load what we wanted maybe we can still load something
      if (platform_type == MRAA_NULL_PLATFORM) {
  #if defined(X86PLAT)
          // Use runtime x86 platform detection
          platform_type = mraa_x86_platform();
  #elif defined(ARMPLAT)
          // Use runtime ARM platform detection
          platform_type = mraa_arm_platform();
  #elif defined(MIPSPLAT)
          // Use runtime ARM platform detection
          platform_type = mraa_mips_platform();
  #elif defined(MOCKPLAT)
          // Use mock platform
          platform_type = mraa_mock_platform();
  #elif defined(PERIPHERALMAN)
          // Use peripheralmanager
          platform_type = mraa_peripheralman_platform();
  #else
  #error mraa_ARCH NOTHING
  #endif
      }
  
      if (plat != NULL) {
          plat->platform_type = platform_type;
      } else {
          platform_name = NULL;
      }
  
      // Create null base platform if one doesn't already exist
      if (plat == NULL) {
          plat = (mraa_board_t*) calloc(1, sizeof(mraa_board_t));
          if (plat != NULL) {
              plat->platform_type = MRAA_NULL_PLATFORM;
              plat->platform_name = "Unknown platform";
          } else {
              return MRAA_ERROR_NO_RESOURCES;
          }
      }
  
  #if defined(USBPLAT)
      syslog(LOG_NOTICE, "Searching for USB plaform extender libraries...");
      /* If a usb platform lib is present, attempt to load and look for
       * necessary symbols for adding extended I/O */
      void* usblib = dlopen("libmraa-platform-ft4222.so", RTLD_LAZY);
      if (usblib) {
          syslog(LOG_NOTICE, "Found USB platform extender library: libmraa-platform-ft4222.so");
          syslog(LOG_NOTICE, "Detecting FT4222 subplatforms...");
          fptr_add_platform_extender add_ft4222_platform =
          (fptr_add_platform_extender) dlsym(usblib, "mraa_usb_platform_extender");
  
          /* If this method exists, call it to add a subplatform */
          syslog(LOG_NOTICE, "Detecting FT4222 subplatforms complete, found %i subplatform/s",
                 ((add_ft4222_platform != NULL) && (add_ft4222_platform(plat) == MRAA_SUCCESS)) ? 1 : 0);
      }
  #endif
  
  #if defined(IMRAA)
      const char* subplatform_lockfile = "/tmp/imraa.lock";
      mraa_add_from_lockfile(subplatform_lockfile);
  #endif
  
  #if !defined(PERIPHERALMAN)
      // Look for IIO devices
      mraa_iio_detect();
  
      if (plat != NULL) {
          int length = strlen(plat->platform_name) + 1;
          if (mraa_has_sub_platform()) {
              // Account for ' + ' chars
              length += strlen(plat->sub_platform->platform_name) + 3;
          }
          platform_name = calloc(length, sizeof(char));
          if (mraa_has_sub_platform()) {
              snprintf(platform_name, length, "%s + %s", plat->platform_name, plat->sub_platform->platform_name);
          } else {
              strncpy(platform_name, plat->platform_name, length);
          }
      }
  #endif
  
      lang_func = (mraa_lang_func_t*) calloc(1, sizeof(mraa_lang_func_t));
      if (lang_func == NULL) {
          return MRAA_ERROR_NO_RESOURCES;
      }
  
      plat->chardev_capable = mraa_is_platform_chardev_interface_capable();
      if (plat->chardev_capable) {
          syslog(LOG_NOTICE, "gpio: support for chardev interface is activated");
      }
  
      syslog(LOG_NOTICE, "libmraa initialised for platform '%s' of type %d", mraa_get_platform_name(),
             mraa_get_platform_type());
      return MRAA_SUCCESS;
  }
  
  #if (defined SWIGPYTHON) || (defined SWIG)
  mraa_result_t
  #else
  mraa_result_t __attribute__((constructor))
  #endif
  mraa_init()
  {
      if (plat != NULL) {
          return MRAA_SUCCESS;
      } else {
          return imraa_init();
      }
  }
  
  void
  mraa_deinit()
  {
      if (plat != NULL) {
          if (plat->pins != NULL) {
              free(plat->pins);
          }
          if (plat->adv_func != NULL) {
              free(plat->adv_func);
          }
          mraa_board_t* sub_plat = plat->sub_platform;
          /* No alloc's in an FTDI_FT4222 platform structure */
          if ((sub_plat != NULL) && (sub_plat->platform_type != MRAA_FTDI_FT4222)) {
              if (sub_plat->pins != NULL) {
                  free(sub_plat->pins);
              }
              if (sub_plat->adv_func != NULL) {
                  free(sub_plat->adv_func);
              }
              free(sub_plat);
          }
          if (plat->platform_type == MRAA_JSON_PLATFORM) {
              // Free the platform name
              free(plat->platform_name);
              plat->platform_name = NULL;
          }
  
          int i = 0;
          /* Free the UART device path.  Note, some platforms dynamically
           * allocate space for device_path, others use #defines or consts,
           * which means this has to be handled differently per platform
           */
          if ((plat->platform_type == MRAA_JSON_PLATFORM) || (plat->platform_type == MRAA_UP2) ||
              (plat->platform_type == MRAA_IEI_TANK) || (plat->platform_type == MRAA_UPXTREME)) {
              for (i = 0; i < plat->uart_dev_count; i++) {
                  if (plat->uart_dev[i].device_path != NULL) {
                      free(plat->uart_dev[i].device_path);
                  }
              }
          }
  
          free(plat);
          plat = NULL;
  
          if (lang_func != NULL) {
              free(lang_func);
              lang_func = NULL;
          }
  
          if (platform_name != NULL) {
              free(platform_name);
              platform_name = NULL;
          }
      }
  #if !defined(PERIPHERALMAN)
      if (plat_iio != NULL) {
          free(plat_iio);
          plat_iio = NULL;
      }
  #else
      pman_mraa_deinit();
  #endif
      closelog();
  }
  
  int
  mraa_set_priority(const int priority)
  {
      struct sched_param sched_s;
  
      memset(&sched_s, 0, sizeof(struct sched_param));
      if (priority > sched_get_priority_max(SCHED_RR)) {
          sched_s.sched_priority = sched_get_priority_max(SCHED_RR);
      } else {
          sched_s.sched_priority = priority;
      }
  
      return sched_setscheduler(0, SCHED_RR, &sched_s);
  }
  
  #if !defined(PERIPHERALMAN)
  static int
  mraa_count_iio_devices(const char* path, const struct stat* sb, int flag, struct FTW* ftwb)
  {
      // we are only interested in files with specific names
      if (fnmatch(IIO_DEVICE_WILDCARD, basename(path), 0) == 0) {
          num_iio_devices++;
      }
      return 0;
  }
  
  mraa_result_t
  mraa_iio_detect()
  {
      plat_iio = (mraa_iio_info_t*) calloc(1, sizeof(mraa_iio_info_t));
      plat_iio->iio_device_count = num_iio_devices;
      // Now detect IIO devices, linux only
      // find how many iio devices we have if we haven't already
      if (num_iio_devices == 0) {
          if (nftw("/sys/bus/iio/devices", &mraa_count_iio_devices, 20, FTW_PHYS) == -1) {
              return MRAA_ERROR_UNSPECIFIED;
          }
      }
      char name[64], filepath[64];
      int fd, len, i;
      plat_iio->iio_device_count = num_iio_devices;
      plat_iio->iio_devices = calloc(num_iio_devices, sizeof(struct _iio));
      struct _iio* device;
      for (i = 0; i < num_iio_devices; i++) {
          device = &plat_iio->iio_devices[i];
          device->num = i;
          snprintf(filepath, 64, "/sys/bus/iio/devices/iio:device%d/name", i);
          fd = open(filepath, O_RDONLY);
          if (fd != -1) {
              len = read(fd, &name, 64);
              if (len > 1) {
                  // remove any trailing CR/LF symbols
                  name[strcspn(name, "\r\n")] = '\0';
                  len = strlen(name);
                  // use strndup
                  device->name = malloc((sizeof(char) * len) + sizeof(char));
                  strncpy(device->name, name, len + 1);
              }
              close(fd);
          }
      }
      return MRAA_SUCCESS;
  }
  
  mraa_result_t
  mraa_setup_mux_mapped(mraa_pin_t meta)
  {
      unsigned int mi;
      mraa_result_t ret;
      mraa_gpio_context mux_i = NULL;
      // avoids the unsigned comparison and we should never have a pin that is UINT_MAX!
      unsigned int last_pin = UINT_MAX;
  
      for (mi = 0; mi < meta.mux_total; mi++) {
  
          switch (meta.mux[mi].pincmd) {
              case PINCMD_UNDEFINED: // used for backward compatibility
                  if (meta.mux[mi].pin != last_pin) {
                      if (mux_i != NULL) {
                          mraa_gpio_owner(mux_i, 0);
                          mraa_gpio_close(mux_i);
                      }
                      mux_i = mraa_gpio_init_raw(meta.mux[mi].pin);
                      if (mux_i == NULL)
                          return MRAA_ERROR_INVALID_HANDLE;
                      last_pin = meta.mux[mi].pin;
                  }
                  // this function will sometimes fail, however this is not critical as
                  // long as the write succeeds - Test case galileo gen2 pin2
                  mraa_gpio_dir(mux_i, MRAA_GPIO_OUT);
                  ret = mraa_gpio_write(mux_i, meta.mux[mi].value);
                  if (ret != MRAA_SUCCESS) {
                      if (mux_i != NULL) {
                          mraa_gpio_owner(mux_i, 0);
                          mraa_gpio_close(mux_i);
                      }
                      return MRAA_ERROR_INVALID_RESOURCE;
                  }
                  break;
  
              case PINCMD_SET_VALUE:
                  if (meta.mux[mi].pin != last_pin) {
                      if (mux_i != NULL) {
                          mraa_gpio_owner(mux_i, 0);
                          mraa_gpio_close(mux_i);
                      }
                      mux_i = mraa_gpio_init_raw(meta.mux[mi].pin);
                      if (mux_i == NULL)
                          return MRAA_ERROR_INVALID_HANDLE;
                      last_pin = meta.mux[mi].pin;
                  }
  
                  ret = mraa_gpio_write(mux_i, meta.mux[mi].value);
  
                  if (ret != MRAA_SUCCESS) {
                      if (mux_i != NULL) {
                          mraa_gpio_owner(mux_i, 0);
                          mraa_gpio_close(mux_i);
                      }
                      return MRAA_ERROR_INVALID_RESOURCE;
                  }
                  break;
  
              case PINCMD_SET_DIRECTION:
                  if (meta.mux[mi].pin != last_pin) {
                      if (mux_i != NULL) {
                          mraa_gpio_owner(mux_i, 0);
                          mraa_gpio_close(mux_i);
                      }
                      mux_i = mraa_gpio_init_raw(meta.mux[mi].pin);
                      if (mux_i == NULL)
                          return MRAA_ERROR_INVALID_HANDLE;
                      last_pin = meta.mux[mi].pin;
                  }
  
                  ret = mraa_gpio_dir(mux_i, meta.mux[mi].value);
  
                  if (ret != MRAA_SUCCESS) {
                      if (mux_i != NULL) {
                          mraa_gpio_owner(mux_i, 0);
                          mraa_gpio_close(mux_i);
                      }
                      return MRAA_ERROR_INVALID_RESOURCE;
                  }
                  break;
  
              case PINCMD_SET_IN_VALUE:
                  if (meta.mux[mi].pin != last_pin) {
                      if (mux_i != NULL) {
                          mraa_gpio_owner(mux_i, 0);
                          mraa_gpio_close(mux_i);
                      }
                      mux_i = mraa_gpio_init_raw(meta.mux[mi].pin);
                      if (mux_i == NULL)
                          return MRAA_ERROR_INVALID_HANDLE;
                      last_pin = meta.mux[mi].pin;
                  }
  
                  ret = mraa_gpio_dir(mux_i, MRAA_GPIO_IN);
  
                  if (ret == MRAA_SUCCESS)
                      ret = mraa_gpio_write(mux_i, meta.mux[mi].value);
  
                  if (ret != MRAA_SUCCESS) {
                      if (mux_i != NULL) {
                          mraa_gpio_owner(mux_i, 0);
                          mraa_gpio_close(mux_i);
                      }
                      return MRAA_ERROR_INVALID_RESOURCE;
                  }
                  break;
  
              case PINCMD_SET_OUT_VALUE:
                  if (meta.mux[mi].pin != last_pin) {
                      if (mux_i != NULL) {
                          mraa_gpio_owner(mux_i, 0);
                          mraa_gpio_close(mux_i);
                      }
                      mux_i = mraa_gpio_init_raw(meta.mux[mi].pin);
                      if (mux_i == NULL)
                          return MRAA_ERROR_INVALID_HANDLE;
                      last_pin = meta.mux[mi].pin;
                  }
  
                  ret = mraa_gpio_dir(mux_i, MRAA_GPIO_OUT);
  
                  if (ret == MRAA_SUCCESS)
                      ret = mraa_gpio_write(mux_i, meta.mux[mi].value);
  
                  if (ret != MRAA_SUCCESS) {
                      if (mux_i != NULL) {
                          mraa_gpio_owner(mux_i, 0);
                          mraa_gpio_close(mux_i);
                      }
                      return MRAA_ERROR_INVALID_RESOURCE;
                  }
                  break;
  
              case PINCMD_SET_MODE:
                  if (meta.mux[mi].pin != last_pin) {
                      if (mux_i != NULL) {
                          mraa_gpio_owner(mux_i, 0);
                          mraa_gpio_close(mux_i);
                      }
                      mux_i = mraa_gpio_init_raw(meta.mux[mi].pin);
                      if (mux_i == NULL)
                          return MRAA_ERROR_INVALID_HANDLE;
                      last_pin = meta.mux[mi].pin;
                  }
  
                  ret = mraa_gpio_mode(mux_i, meta.mux[mi].value);
  
                  if (ret != MRAA_SUCCESS) {
                      if (mux_i != NULL) {
                          mraa_gpio_owner(mux_i, 0);
                          mraa_gpio_close(mux_i);
                      }
                      return MRAA_ERROR_INVALID_RESOURCE;
                  }
                  break;
  
              case PINCMD_SKIP:
                  break;
  
              default:
                  syslog(LOG_NOTICE, "mraa_setup_mux_mapped: wrong command %d on pin %d with value %d",
                         meta.mux[mi].pincmd, meta.mux[mi].pin, meta.mux[mi].value);
                  break;
          }
      }
  
      if (mux_i != NULL) {
          mraa_gpio_owner(mux_i, 0);
          mraa_gpio_close(mux_i);
      }
  
      return MRAA_SUCCESS;
  }
  #else
  mraa_result_t
  mraa_setup_mux_mapped(mraa_pin_t meta)
  {
      return MRAA_ERROR_FEATURE_NOT_IMPLEMENTED;
  }
  #endif
  
  void
  mraa_result_print(mraa_result_t result)
  {
      switch (result) {
          case MRAA_SUCCESS:
              fprintf(stdout, "MRAA: SUCCESS\n");
              break;
          case MRAA_ERROR_FEATURE_NOT_IMPLEMENTED:
              fprintf(stdout, "MRAA: Feature not implemented.\n");
              break;
          case MRAA_ERROR_FEATURE_NOT_SUPPORTED:
              fprintf(stdout, "MRAA: Feature not supported by Hardware.\n");
              break;
          case MRAA_ERROR_INVALID_VERBOSITY_LEVEL:
              fprintf(stdout, "MRAA: Invalid verbosity level.\n");
              break;
          case MRAA_ERROR_INVALID_PARAMETER:
              fprintf(stdout, "MRAA: Invalid parameter.\n");
              break;
          case MRAA_ERROR_INVALID_HANDLE:
              fprintf(stdout, "MRAA: Invalid Handle.\n");
              break;
          case MRAA_ERROR_NO_RESOURCES:
              fprintf(stdout, "MRAA: No resources.\n");
              break;
          case MRAA_ERROR_INVALID_RESOURCE:
              fprintf(stdout, "MRAA: Invalid resource.\n");
              break;
          case MRAA_ERROR_INVALID_QUEUE_TYPE:
              fprintf(stdout, "MRAA: Invalid Queue Type.\n");
              break;
          case MRAA_ERROR_NO_DATA_AVAILABLE:
              fprintf(stdout, "MRAA: No Data available.\n");
              break;
          case MRAA_ERROR_INVALID_PLATFORM:
              fprintf(stdout, "MRAA: Platform not recognised.\n");
              break;
          case MRAA_ERROR_PLATFORM_NOT_INITIALISED:
              fprintf(stdout, "MRAA: Platform not initialised.\n");
              break;
          case MRAA_ERROR_UART_OW_SHORTED:
              fprintf(stdout, "MRAA: UART OW: Bus short detected.\n");
              break;
          case MRAA_ERROR_UART_OW_NO_DEVICES:
              fprintf(stdout, "MRAA: UART OW: No devices detected on bus.\n");
              break;
          case MRAA_ERROR_UART_OW_DATA_ERROR:
              fprintf(stdout, "MRAA: UART OW: Data or Bus error detected.\n");
              break;
          case MRAA_ERROR_UNSPECIFIED:
              fprintf(stdout, "MRAA: Unspecified Error.\n");
              break;
          default:
              fprintf(stdout, "MRAA: Unrecognised error.\n");
              break;
      }
  }
  
  
  mraa_boolean_t
  mraa_has_sub_platform()
  {
      return (plat != NULL) && (plat->sub_platform != NULL);
  }
  
  mraa_boolean_t
  mraa_pin_mode_test(int pin, mraa_pinmodes_t mode)
  {
      if (plat == NULL)
          return 0;
  
      mraa_board_t* current_plat = plat;
      if (mraa_is_sub_platform_id(pin)) {
          current_plat = plat->sub_platform;
          if (current_plat == NULL) {
              syslog(LOG_ERR, "mraa_pin_mode_test: Sub platform Not Initialised");
              return 0;
          }
          pin = mraa_get_sub_platform_index(pin);
      }
  
      if (current_plat == NULL || current_plat->platform_type == MRAA_UNKNOWN_PLATFORM ||
          current_plat->platform_type == MRAA_NULL_PLATFORM) {
          return 0;
      }
      if (pin > (current_plat->phy_pin_count - 1) || pin < 0)
          return 0;
  
      switch (mode) {
          case MRAA_PIN_VALID:
              if (current_plat->pins[pin].capabilities.valid == 1)
                  return 1;
              break;
          case MRAA_PIN_GPIO:
              if (current_plat->pins[pin].capabilities.gpio == 1)
                  return 1;
              break;
          case MRAA_PIN_PWM:
              if (current_plat->pins[pin].capabilities.pwm == 1)
                  return 1;
              break;
          case MRAA_PIN_FAST_GPIO:
              if (current_plat->pins[pin].capabilities.fast_gpio == 1)
                  return 1;
              break;
          case MRAA_PIN_SPI:
              if (current_plat->pins[pin].capabilities.spi == 1)
                  return 1;
              break;
          case MRAA_PIN_I2C:
              if (current_plat->pins[pin].capabilities.i2c == 1)
                  return 1;
              break;
          case MRAA_PIN_AIO:
              if (current_plat->pins[pin].capabilities.aio == 1)
                  return 1;
              break;
          case MRAA_PIN_UART:
              if (current_plat->pins[pin].capabilities.uart == 1)
                  return 1;
              break;
          default:
              syslog(LOG_NOTICE, "requested pinmode invalid");
              break;
      }
      return 0;
  }
  
  mraa_platform_t
  mraa_get_platform_type()
  {
      if (plat == NULL)
          return MRAA_UNKNOWN_PLATFORM;
      return plat->platform_type;
  }
  
  int
  mraa_get_platform_combined_type()
  {
      int type = mraa_get_platform_type();
      int sub_type = mraa_has_sub_platform() ? plat->sub_platform->platform_type : MRAA_UNKNOWN_PLATFORM;
      return type | (sub_type << 8);
  }
  
  unsigned int
  mraa_adc_raw_bits()
  {
      if (plat == NULL)
          return 0;
  
      if (plat->aio_count == 0)
          return 0;
  
      return plat->adc_raw;
  }
  
  unsigned int
  mraa_get_platform_adc_raw_bits(uint8_t platform_offset)
  {
      if (platform_offset == MRAA_MAIN_PLATFORM_OFFSET)
          return mraa_adc_raw_bits();
      else {
          if (!mraa_has_sub_platform())
              return 0;
  
          if (plat->sub_platform->aio_count == 0)
              return 0;
  
          return plat->sub_platform->adc_raw;
      }
  }
  
  
  unsigned int
  mraa_adc_supported_bits()
  {
      if (plat == NULL)
          return 0;
  
      if (plat->aio_count == 0)
          return 0;
  
      return plat->adc_supported;
  }
  
  unsigned int
  mraa_get_platform_adc_supported_bits(int platform_offset)
  {
      if (platform_offset == MRAA_MAIN_PLATFORM_OFFSET)
          return mraa_adc_supported_bits();
      else {
          if (!mraa_has_sub_platform())
              return 0;
  
          if (plat->sub_platform->aio_count == 0)
              return 0;
  
          return plat->sub_platform->adc_supported;
      }
  }
  
  const char*
  mraa_get_platform_name()
  {
      return platform_name;
  }
  
  const char*
  mraa_get_platform_version(int platform_offset)
  {
      if (plat == NULL) {
          return NULL;
      }
      if (platform_offset == MRAA_MAIN_PLATFORM_OFFSET) {
          return plat->platform_version;
      } else {
          return plat->sub_platform->platform_version;
      }
  }
  
  int
  mraa_get_uart_count()
  {
      if (plat == NULL) {
          return -1;
      }
      return plat->uart_dev_count;
  }
  
  int
  mraa_get_spi_bus_count()
  {
      if (plat == NULL) {
          return -1;
      }
      return plat->spi_bus_count;
  }
  
  int
  mraa_get_pwm_count()
  {
      if (plat == NULL) {
          return -1;
      }
      return plat->pwm_dev_count;
  }
  
  int
  mraa_get_gpio_count()
  {
      if (plat == NULL) {
          return -1;
      }
      return plat->gpio_count;
  }
  
  int
  mraa_get_aio_count()
  {
      if (plat == NULL) {
          return -1;
      }
      return plat->aio_count;
  }
  
  int
  mraa_get_i2c_bus_count()
  {
      if (plat == NULL) {
          return -1;
      }
      return plat->i2c_bus_count;
  }
  
  int
  mraa_get_i2c_bus_id(int i2c_bus)
  {
      if (plat == NULL) {
          return -1;
      }
  
      if (i2c_bus >= plat->i2c_bus_count) {
          return -1;
      }
  
      return plat->i2c_bus[i2c_bus].bus_id;
  }
  
  unsigned int
  mraa_get_pin_count()
  {
      if (plat == NULL) {
          return 0;
      }
      return plat->phy_pin_count;
  }
  
  unsigned int
  mraa_get_platform_pin_count(uint8_t platform_offset)
  {
      if (platform_offset == MRAA_MAIN_PLATFORM_OFFSET)
          return mraa_get_pin_count();
      else {
          if (mraa_has_sub_platform())
              return plat->sub_platform->phy_pin_count;
          else
              return 0;
      }
  }
  
  
  char*
  mraa_get_pin_name(int pin)
  {
      if (plat == NULL) {
          return 0;
      }
  
      mraa_board_t* current_plat = plat;
      if (mraa_is_sub_platform_id(pin)) {
          current_plat = plat->sub_platform;
          if (current_plat == NULL) {
              syslog(LOG_ERR, "mraa_get_pin_name: Sub platform Not Initialised");
              return 0;
          }
          pin = mraa_get_sub_platform_index(pin);
      }
  
      if (pin > (current_plat->phy_pin_count - 1) || pin < 0) {
          return NULL;
      }
      return (char*) current_plat->pins[pin].name;
  }
  
  int
  mraa_gpio_lookup(const char* pin_name)
  {
      int i;
  
      if (plat == NULL) {
          return -1;
      }
  
      if (pin_name == NULL || strlen(pin_name) == 0) {
          return -1;
      }
  
      for (i = 0; i < plat->phy_pin_count; i++) {
          // Skip non GPIO pins
          if (!(plat->pins[i].capabilities.gpio))
              continue;
  
          if (plat->pins[i].name != NULL &&
              strncmp(pin_name, plat->pins[i].name, strlen(plat->pins[i].name) + 1) == 0) {
              return i;
          }
      }
      return -1;
  }
  
  int
  mraa_i2c_lookup(const char* i2c_name)
  {
      int i;
  
      if (plat == NULL) {
          return -1;
      }
  
      if (i2c_name == NULL || strlen(i2c_name) == 0) {
          return -1;
      }
  
      for (i = 0; i < plat->i2c_bus_count; i++) {
          if (plat->i2c_bus[i].name != NULL &&
              strncmp(i2c_name, plat->i2c_bus[i].name, strlen(plat->i2c_bus[i].name) + 1) == 0) {
              return plat->i2c_bus[i].bus_id;
          }
      }
      return -1;
  }
  
  int
  mraa_spi_lookup(const char* spi_name)
  {
      int i;
  
      if (plat == NULL) {
          return -1;
      }
  
      if (spi_name == NULL || strlen(spi_name) == 0) {
          return -1;
      }
  
      for (i = 0; i < plat->spi_bus_count; i++) {
          if (plat->spi_bus[i].name != NULL &&
              strncmp(spi_name, plat->spi_bus[i].name, strlen(plat->spi_bus[i].name) + 1) == 0) {
              return plat->spi_bus[i].bus_id;
          }
      }
      return -1;
  }
  
  int
  mraa_pwm_lookup(const char* pwm_name)
  {
      int i;
  
      if (plat == NULL) {
          return -1;
      }
  
      if (pwm_name == NULL || strlen(pwm_name) == 0) {
          return -1;
      }
  
      for (i = 0; i < plat->pwm_dev_count; i++) {
          if (plat->pwm_dev[i].name != NULL &&
              strncmp(pwm_name, plat->pwm_dev[i].name, strlen(plat->pwm_dev[i].name) + 1) == 0) {
              return plat->pwm_dev[i].index;
          }
      }
      return -1;
  }
  
  int
  mraa_uart_lookup(const char* uart_name)
  {
      int i;
  
      if (plat == NULL) {
          return -1;
      }
  
      if (uart_name == NULL || strlen(uart_name) == 0) {
          return -1;
      }
  
      for (i = 0; i < plat->uart_dev_count; i++) {
          if (plat->uart_dev[i].name != NULL &&
              strncmp(uart_name, plat->uart_dev[i].name, strlen(plat->uart_dev[i].name) + 1) == 0) {
              return plat->uart_dev[i].index;
          }
      }
      return -1;
  }
  
  int
  mraa_get_default_i2c_bus(uint8_t platform_offset)
  {
      if (plat == NULL)
          return -1;
      if (platform_offset == MRAA_MAIN_PLATFORM_OFFSET) {
          return plat->def_i2c_bus;
      } else {
          if (mraa_has_sub_platform())
              return plat->sub_platform->def_i2c_bus;
          else
              return -1;
      }
  }
  
  #if !defined(PERIPHERALMAN)
  
  mraa_boolean_t
  mraa_file_exist(const char* filename)
  {
      glob_t results;
      results.gl_pathc = 0;
      glob(filename, 0, NULL, &results);
      int file_found = results.gl_pathc == 1;
      globfree(&results);
      return file_found;
  }
  
  mraa_boolean_t
  mraa_file_contains(const char* filename, const char* content)
  {
      mraa_boolean_t found = 0;
      if ((filename == NULL) || (content == NULL)) {
          return 0;
      }
  
      char* file = mraa_file_unglob(filename);
      if (file != NULL) {
          size_t len = 0;
          char* line = NULL;
          FILE* fh = fopen(file, "r");
          if (fh == NULL) {
              free(file);
              return 0;
          }
          while ((getline(&line, &len, fh) != -1) && (found == 0)) {
              if (strstr(line, content)) {
                  found = 1;
                  break;
              }
          }
          fclose(fh);
          free(file);
          free(line);
      }
      return found;
  }
  
  mraa_boolean_t
  mraa_file_contains_both(const char* filename, const char* content, const char* content2)
  {
      mraa_boolean_t found = 0;
      if ((filename == NULL) || (content == NULL)) {
          return 0;
      }
  
      char* file = mraa_file_unglob(filename);
      if (file != NULL) {
          size_t len = 0;
          char* line = NULL;
          FILE* fh = fopen(file, "r");
          if (fh == NULL) {
              free(file);
              return 0;
          }
          while ((getline(&line, &len, fh) != -1) && (found == 0)) {
              if (strstr(line, content) && strstr(line, content2)) {
                  found = 1;
                  break;
              }
          }
          fclose(fh);
          free(file);
          free(line);
      }
      return found;
  }
  
  char*
  mraa_file_unglob(const char* filename)
  {
      glob_t results;
      char* res = NULL;
      results.gl_pathc = 0;
      glob(filename, 0, NULL, &results);
      if (results.gl_pathc == 1)
          res = strdup(results.gl_pathv[0]);
      globfree(&results);
      return res;
  }
  
  mraa_boolean_t
  mraa_link_targets(const char* filename, const char* targetname)
  {
      int size = 100;
      int nchars = 0;
      char* buffer = NULL;
      while (nchars == 0) {
          char* old_buffer = buffer;
          buffer = (char*) realloc(buffer, size);
          if (buffer == NULL) {
              free(old_buffer);
              return 0;
          }
          nchars = readlink(filename, buffer, size);
          if (nchars < 0) {
              free(buffer);
              return 0;
          } else {
              buffer[nchars] = '\0';
          }
          if (nchars >= size) {
              size *= 2;
              nchars = 0;
          }
      }
      if (strstr(buffer, targetname)) {
          free(buffer);
          return 1;
      } else {
          free(buffer);
          return 0;
      }
  }
  
  mraa_result_t
  mraa_find_uart_bus_pci(const char* pci_dev_path, char** dev_name)
  {
      char path[PATH_MAX];
      const int max_allowable_len = 16;
      snprintf(path, PATH_MAX - 1, "%s", pci_dev_path);
      if (!mraa_file_exist(path)) {
          return MRAA_ERROR_INVALID_PARAMETER;
      }
  
      struct dirent** namelist;
      int n = scandir(path, &namelist, NULL, alphasort);
      if (n <= 0) {
          syslog(LOG_ERR, "Failed to find expected UART bus: %s", strerror(errno));
          return MRAA_ERROR_INVALID_RESOURCE;
      }
  
      *dev_name = (char*) malloc(sizeof(char) * max_allowable_len);
  
      snprintf(*dev_name, max_allowable_len, "/dev/%s", namelist[n - 1]->d_name);
      while (n--) {
          free(namelist[n]);
      }
      free(namelist);
      syslog(LOG_INFO, "UART device: %s selected for initialization", *dev_name);
      return MRAA_SUCCESS;
  }
  
  static int
  mraa_count_i2c_files(const char* path, const struct stat* sb, int flag, struct FTW* ftwb)
  {
      switch (sb->st_mode & S_IFMT) {
          case S_IFLNK:
              num_i2c_devices++;
              break;
      }
      return 0;
  }
  
  int
  mraa_find_i2c_bus_pci(const char* pci_device, const char* pci_id, const char* adapter_name)
  {
      /**
       * For example we'd get something like:
       * pci0000:00/0000:00:16.3/i2c_desiignware.3
       */
      char path[1024];
      snprintf(path, 1024 - 1, "/sys/devices/pci%s/%s/%s/", pci_device, pci_id, adapter_name);
      if (mraa_file_exist(path)) {
          struct dirent** namelist;
          int n;
          n = scandir(path, &namelist, NULL, alphasort);
          if (n < 0) {
              syslog(LOG_ERR, "Failed to get information on i2c");
              return -1;
          } else {
              while (n--) {
                  char* dup = strdup(namelist[n]->d_name);
                  char* orig_dup = dup;
                  if (dup == NULL) {
                      syslog(LOG_ERR, "Ran out of memory!");
                      break;
                  }
                  const char delim = '-';
                  char* token;
                  token = strsep(&dup, &delim);
                  if (token != NULL) {
                      if (strncmp("i2c", token, 3) == 0) {
                          token = strsep(&dup, &delim);
                          if (token != NULL) {
                              int ret = -1;
                              if (mraa_atoi(token, &ret) == MRAA_SUCCESS) {
                                  free(orig_dup);
                                  free(namelist[n]);
                                  free(namelist);
                                  syslog(LOG_NOTICE, "Adding i2c bus found on i2c-%d on adapter %s", ret, adapter_name);
                                  return ret;
                              }
                              free(orig_dup);
                              free(namelist[n]);
                              free(namelist);
                              return -1;
                          }
                      }
                  }
                  free(orig_dup);
                  free(namelist[n]);
              }
              free(namelist);
          }
      }
      return -1;
  }
  
  int
  mraa_find_i2c_bus(const char* devname, int startfrom)
  {
      char path[64];
      int fd;
      // because feeding mraa_find_i2c_bus result back into the function is
      // useful treat -1 as 0
      int i = (startfrom < 0) ? 0 : startfrom;
      int ret = -1;
  
      // find how many i2c buses we have if we haven't already
      if (num_i2c_devices == 0) {
          if (nftw("/sys/class/i2c-dev/", &mraa_count_i2c_files, 20, FTW_PHYS) == -1) {
              return -1;
          }
      }
  
      // i2c devices are numbered numerically so 0 must exist otherwise there is
      // no i2c-dev loaded
      if (mraa_file_exist("/sys/class/i2c-dev/i2c-0")) {
          for (; i < num_i2c_devices; i++) {
              off_t size, err;
              snprintf(path, 64, "/sys/class/i2c-dev/i2c-%u/name", i);
              fd = open(path, O_RDONLY);
              if (fd < 0) {
                  break;
              }
              size = lseek(fd, 0, SEEK_END);
              if (size < 0) {
                  syslog(LOG_WARNING, "mraa: failed to seek i2c filename file");
                  close(fd);
                  break;
              }
              err = lseek(fd, 0, SEEK_SET);
              if (err < 0) {
                  syslog(LOG_WARNING, "mraa: failed to seek i2c filename file");
                  close(fd);
                  break;
              }
              char* value = malloc(size);
              if (value == NULL) {
                  syslog(LOG_ERR, "mraa: failed to allocate memory for i2c file");
                  close(fd);
                  break;
              }
              ssize_t r = read(fd, value, size);
              if (r > 0) {
                  if (strcasestr(value, devname) != NULL) {
                      free(value);
                      close(fd);
                      return i;
                  }
              } else {
                  syslog(LOG_ERR, "mraa: sysfs i2cdev failed");
              }
              free(value);
              close(fd);
          }
      } else {
          syslog(LOG_WARNING, "mraa: no i2c-dev detected, load i2c-dev");
      }
  
      return ret;
  }
  
  #endif
  
  mraa_boolean_t
  mraa_is_sub_platform_id(int pin_or_bus)
  {
      return (pin_or_bus & MRAA_SUB_PLATFORM_MASK) != 0;
  }
  
  int
  mraa_get_sub_platform_id(int pin_or_bus)
  {
      return pin_or_bus | MRAA_SUB_PLATFORM_MASK;
  }
  
  int
  mraa_get_sub_platform_index(int pin_or_bus)
  {
      return pin_or_bus & (~MRAA_SUB_PLATFORM_MASK);
  }
  
  int
  mraa_get_iio_device_count()
  {
  #if defined(PERIPHERALMAN)
      return -1;
  #else
      return plat_iio->iio_device_count;
  #endif
  }
  
  mraa_result_t
  mraa_add_subplatform(mraa_platform_t subplatformtype, const char* dev)
  {
  #if defined(FIRMATA)
      if (subplatformtype == MRAA_GENERIC_FIRMATA) {
          if (plat->sub_platform != NULL) {
              if (plat->sub_platform->platform_type == subplatformtype) {
                  syslog(LOG_NOTICE, "mraa: Firmata subplatform already present");
                  return MRAA_SUCCESS;
              }
              syslog(LOG_NOTICE, "mraa: We don't support multiple firmata subplatforms!");
              return MRAA_ERROR_FEATURE_NOT_SUPPORTED;
          }
          if (mraa_firmata_platform(plat, dev) == MRAA_GENERIC_FIRMATA) {
              syslog(LOG_NOTICE, "mraa: Added firmata subplatform");
              return MRAA_SUCCESS;
          }
      }
  #else
      if (subplatformtype == MRAA_GENERIC_FIRMATA) {
          syslog(LOG_NOTICE, "mraa: Cannot add Firmata platform as support not compiled in");
      }
  #endif
  
      if (subplatformtype == MRAA_GROVEPI) {
          if (plat == NULL || plat->platform_type == MRAA_UNKNOWN_PLATFORM || plat->i2c_bus_count == 0) {
              syslog(LOG_NOTICE, "mraa: The GrovePi shield is not supported on this platform!");
              return MRAA_ERROR_FEATURE_NOT_SUPPORTED;
          }
          if (plat->sub_platform != NULL) {
              syslog(LOG_NOTICE, "mraa: A subplatform was already added!");
              return MRAA_ERROR_FEATURE_NOT_SUPPORTED;
          }
          int i2c_bus;
          char* dev_dup = strdup(dev);
          if (mraa_atoi(dev_dup, &i2c_bus) != MRAA_SUCCESS && i2c_bus < plat->i2c_bus_count) {
              syslog(LOG_NOTICE, "mraa: Cannot add GrovePi subplatform, invalid i2c bus specified");
              free(dev_dup);
              return MRAA_ERROR_INVALID_PARAMETER;
          }
          free(dev_dup);
          if (mraa_grovepi_platform(plat, i2c_bus) == MRAA_GROVEPI) {
              syslog(LOG_NOTICE, "mraa: Added GrovePi subplatform");
              return MRAA_SUCCESS;
          }
      }
  
      return MRAA_ERROR_INVALID_PARAMETER;
  }
  
  mraa_result_t
  mraa_remove_subplatform(mraa_platform_t subplatformtype)
  {
      if (subplatformtype != MRAA_FTDI_FT4222) {
          if (plat == NULL || plat->sub_platform == NULL) {
              return MRAA_ERROR_INVALID_PARAMETER;
          }
          free(plat->sub_platform->adv_func);
          free(plat->sub_platform->pins);
          free(plat->sub_platform);
          return MRAA_SUCCESS;
      }
      return MRAA_ERROR_INVALID_PARAMETER;
  }
  
  #if defined(IMRAA)
  mraa_result_t
  mraa_add_from_lockfile(const char* imraa_lock_file)
  {
      mraa_result_t ret = MRAA_SUCCESS;
      char* buffer = NULL;
      struct stat st;
      int i = 0;
      uint32_t subplat_num = 0;
      int flock = open(imraa_lock_file, O_RDONLY);
      if (flock == -1) {
          syslog(LOG_ERR, "imraa: Failed to open lock file");
          return MRAA_ERROR_INVALID_RESOURCE;
      }
      if (fstat(flock, &st) != 0 || (!S_ISREG(st.st_mode))) {
          close(flock);
          return MRAA_ERROR_INVALID_RESOURCE;
      }
      buffer = mmap(0, st.st_size, PROT_READ, MAP_SHARED, flock, 0);
      close(flock);
      if (buffer == MAP_FAILED) {
          syslog(LOG_ERR, "imraa: lockfile read error");
          return MRAA_ERROR_INVALID_RESOURCE;
      }
      json_object* jobj_lock = json_tokener_parse(buffer);
  
      struct json_object* ioarray;
      if (json_object_object_get_ex(jobj_lock, "Platform", &ioarray) == true &&
          json_object_is_type(ioarray, json_type_array)) {
          subplat_num = json_object_array_length(ioarray);
          int id = -1;
          const char* uartdev = NULL;
          for (i = 0; i < subplat_num; i++) {
              struct json_object* ioobj = json_object_array_get_idx(ioarray, i);
              json_object_object_foreach(ioobj, key, val)
              {
                  if (strncmp(key, "id", strlen("id") + 1) == 0) {
                      if (mraa_atoi(json_object_get_string(val), &id) != MRAA_SUCCESS) {
                          id = -1;
                      }
                  } else if (strncmp(key, "uart", strlen("uart") + 1) == 0) {
                      uartdev = json_object_get_string(val);
                  }
              }
              if (id != -1 && id != MRAA_NULL_PLATFORM && id != MRAA_UNKNOWN_PLATFORM && uartdev != NULL) {
                  if (mraa_add_subplatform(id, uartdev) == MRAA_SUCCESS) {
                      syslog(LOG_NOTICE, "imraa: automatically added subplatform %d, %s", id, uartdev);
                  } else {
                      syslog(LOG_ERR, "imraa: Failed to add subplatform (%d on %s) from lockfile", id, uartdev);
                  }
                  id = -1;
                  uartdev = NULL;
              }
          }
          if (json_object_object_get_ex(jobj_lock, "IO", &ioarray) == true &&
              json_object_is_type(ioarray, json_type_array)) {
              /* assume we have declared IO so we are preinitialised and wipe the
               * advance func array
               */
              memset(plat->adv_func, 0, sizeof(mraa_adv_func_t));
          }
      } else {
          ret = MRAA_ERROR_INVALID_RESOURCE;
      }
      json_object_put(jobj_lock);
      munmap(buffer, st.st_size);
      return ret;
  }
  #endif
  
  void
  mraa_to_upper(char* s)
  {
      char* t = s;
      for (; *t; ++t) {
          *t = toupper(*t);
      }
  }
  
  mraa_result_t
  mraa_atoi(char* intStr, int* value)
  {
      char* end;
      // here 10 determines the number base in which strol is to work
      long val = strtol(intStr, &end, 10);
      if (*end != '\0' || errno == ERANGE || end == intStr || val > INT_MAX || val < INT_MIN) {
          *value = 0;
          return MRAA_ERROR_UNSPECIFIED;
      }
      *value = (int) val;
      return MRAA_SUCCESS;
  }
  
  mraa_result_t
  mraa_init_io_helper(char** str, int* value, const char* delim)
  {
      // This function is a result of a repeated pattern within mraa_init_io
      // when determining if a value can be derived from a string
      char* token;
      token = strsep(str, delim);
      // check to see if empty string returned
      if (token == NULL) {
          *value = 0;
          return MRAA_ERROR_NO_DATA_AVAILABLE;
      }
      return mraa_atoi(token, value);
  }
  
  void*
  mraa_init_io(const char* desc)
  {
      const char* delim = "-";
      int length = 0, raw = 0;
      int pin = 0, id = 0;
      // 256 denotes the maximum size of our buffer
      // 8 denotes the maximum size of our type rounded to the nearest power of 2
      // max size is 4 + 1 for the \0 = 5 rounded to 8
      char buffer[256] = { 0 }, type[8] = { 0 };
      char *token = 0, *str = 0;
      if (desc == NULL) {
          return NULL;
      }
      length = strlen(desc);
      // Check to see the length is less than or equal to 255 which means
      // byte 256 is supposed to be \0
      if (length > 255 || length == 0) {
          return NULL;
      }
      strncpy(buffer, desc, length);
  
      str = buffer;
      token = strsep(&str, delim);
      length = strlen(token);
      // Check to see they haven't given us a type whose length is greater than the
      // largest type we know about
      if (length > 4) {
          syslog(LOG_ERR, "mraa_init_io: An invalid IO type was provided");
          return NULL;
      }
      strncpy(type, token, length);
      mraa_to_upper(type);
      token = strsep(&str, delim);
      // Check that they've given us more information than just the type
      if (token == NULL) {
          syslog(LOG_ERR, "mraa_init_io: Missing information after type");
          return NULL;
      }
      // If we cannot convert the pin to a number maybe it says raw?
      if (mraa_atoi(token, &pin) != MRAA_SUCCESS) {
          mraa_to_upper(token);
          if (strncmp(token, "RAW", strlen("RAW") + 1)) {
              syslog(LOG_ERR, "mraa_init_io: Description does not adhere to a known format");
              return NULL;
          }
          raw = 1;
      }
      if (!raw && str != NULL) {
          syslog(LOG_ERR, "mraa_init_io: More information than required was provided");
          return NULL;
      }
  
      if (strncmp(type, GPIO_KEY, strlen(GPIO_KEY) + 1) == 0) {
          if (raw) {
              if (mraa_init_io_helper(&str, &pin, delim) == MRAA_SUCCESS) {
                  return (void*) mraa_gpio_init_raw(pin);
              }
              syslog(LOG_ERR, "mraa_init_io: Invalid Raw description for GPIO");
              return NULL;
          }
          return (void*) mraa_gpio_init(pin);
      } else if (strncmp(type, I2C_KEY, strlen(I2C_KEY) + 1) == 0) {
          if (raw) {
              if (mraa_init_io_helper(&str, &pin, delim) == MRAA_SUCCESS) {
                  return (void*) mraa_i2c_init_raw(pin);
              }
              syslog(LOG_ERR, "mraa_init_io: Invalid Raw description for I2C");
              return NULL;
          }
          return (void*) mraa_i2c_init(pin);
      } else if (strncmp(type, AIO_KEY, strlen(AIO_KEY) + 1) == 0) {
          if (raw) {
              syslog(LOG_ERR, "mraa_init_io: Aio doesn't have a RAW mode");
              return NULL;
          }
          return (void*) mraa_aio_init(pin);
      } else if (strncmp(type, PWM_KEY, strlen(PWM_KEY) + 1) == 0) {
          if (raw) {
              if (mraa_init_io_helper(&str, &id, delim) != MRAA_SUCCESS) {
                  syslog(LOG_ERR, "mraa_init_io: Pwm, unable to convert the chip id string into a "
                                  "useable Int");
                  return NULL;
              }
              if (mraa_init_io_helper(&str, &pin, delim) != MRAA_SUCCESS) {
                  syslog(LOG_ERR,
                         "mraa_init_io: Pwm, unable to convert the pin string into a useable Int");
                  return NULL;
              }
              return (void*) mraa_pwm_init_raw(id, pin);
          }
          return (void*) mraa_pwm_init(pin);
      } else if (strncmp(type, SPI_KEY, strlen(SPI_KEY) + 1) == 0) {
          if (raw) {
              if (mraa_init_io_helper(&str, &id, delim) != MRAA_SUCCESS) {
                  syslog(LOG_ERR,
                         "mraa_init_io: Spi, unable to convert the bus string into a useable Int");
                  return NULL;
              }
              if (mraa_init_io_helper(&str, &pin, delim) != MRAA_SUCCESS) {
                  syslog(LOG_ERR,
                         "mraa_init_io: Spi, unable to convert the cs string into a useable Int");
                  return NULL;
              }
              return (void*) mraa_spi_init_raw(id, pin);
          }
          return (void*) mraa_spi_init(pin);
      } else if (strncmp(type, UART_KEY, strlen(UART_KEY) + 1) == 0) {
          if (raw) {
              return (void*) mraa_uart_init_raw(str);
          }
          return (void*) mraa_uart_init(pin);
      }
      syslog(LOG_ERR, "mraa_init_io: Invalid IO type given.");
      return NULL;
  }
  
  
  #ifndef JSONPLAT
  mraa_result_t
  mraa_init_json_platform(const char* desc)
  {
      return MRAA_ERROR_FEATURE_NOT_SUPPORTED;
  }
  #endif
  