text: /*
   * Copyright (C) 2014 The CyanogenMod Project
   *
   * 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.
   */
  #include <errno.h>
  #include <string.h>
  
  #include <hardware/hardware.h>
  #include <hardware/nfc.h>
  
  static uint8_t pn544_eedata_settings[][4] = {
      // DIFFERENTIAL_ANTENNA
  
      // RF Settings
      {0x00,0x9B,0xD1,0x0D} // Tx consumption higher than 0x0D (average 50mA)
      ,{0x00,0x9B,0xD2,0x24} // GSP setting for this threshold
      ,{0x00,0x9B,0xD3,0x0A} // Tx consumption higher than 0x0A (average 40mA)
      ,{0x00,0x9B,0xD4,0x22} // GSP setting for this threshold
      ,{0x00,0x9B,0xD5,0x08} // Tx consumption higher than 0x08 (average 30mA)
      ,{0x00,0x9B,0xD6,0x1E} // GSP setting for this threshold
      ,{0x00,0x9B,0xDD,0x1C} // GSP setting for this threshold
      ,{0x00,0x9B,0x84,0x13} // ANACM2 setting
  
      // Enable PBTF
      ,{0x00,0x98,0x00,0x3F} // SECURE_ELEMENT_CONFIGURATION - No Secure Element
      ,{0x00,0x9F,0x09,0x00} // SWP_PBTF_RFU
      ,{0x00,0x9F,0x0A,0x05} // SWP_PBTF_RFLD  --> RFLEVEL Detector for PBTF
      ,{0x00,0x9E,0xD1,0xA1} //
  
      // Change RF Level Detector ANARFLDWU
      ,{0x00,0x99,0x23,0x00} // Default Value is 0x01
  
      // Low-power polling
      ,{0x00,0x9E,0x74,0xB0} // Default Value is 0x00, bits 0->2: sensitivity (0==max, 6==min),
                             // bit 3: RFU,
                             // bits 4,5 hybrid low-power: # of low-power polls per regular poll
                             // bit 6: RFU
                             // bit 7: (0 -> disabled, 1 -> enabled)
      ,{0x00,0x9E,0x7D,0xB0} // bits 0->3: RFU,
                             // bits 4,5: # retries after low power detection
                             // 0=1 retry, 1=2 retry, 2=3 retry, 3=4 retry
                             // bit 6: RFU,
                             // bit 7: Enable or disable retry mechanism (0: disable, 1: enable)
      ,{0x00,0x9F,0x28,0x01} // bits 0->7: # of measurements per low-power poll
  
      // Polling Loop - Card Emulation Timeout
      ,{0x00,0x9F,0x35,0x14} // Time for which PN544 stays in Card Emulation mode after leaving RF field
      ,{0x00,0x9F,0x36,0x60} // Default value 0x0411 = 50 ms ---> New Value : 0x1460 = 250 ms
  
      //LLC Timer
      ,{0x00,0x9C,0x31,0x00} // Guard host time-out in ms (MSB)
      ,{0x00,0x9C,0x32,0xC8} // Guard host time-out in ms (LSB)
      ,{0x00,0x9C,0x19,0x40} // Max RX retry (PN544=>host?)
      ,{0x00,0x9C,0x1A,0x40} // Max TX retry (PN544=>host?)
  
      ,{0x00,0x9C,0x0C,0x00} //
      ,{0x00,0x9C,0x0D,0x00} //
      ,{0x00,0x9C,0x12,0x00} //
      ,{0x00,0x9C,0x13,0x00} //
  
      // NFC-DEP Target Waiting Time (WT)
      ,{0x00,0x98,0xA2,0x08} // Set to 0x08 as required by [digital] (default value: 09)
  
      //SE GPIO
      ,{0x00, 0x98, 0x93, 0x40}
  
      // Set NFCT ATQA
      ,{0x00, 0x98, 0x7D, 0x02}
      ,{0x00, 0x98, 0x7E, 0x00}
  
      // Enable CEA detection mechanism
      ,{0x00, 0x9F, 0xC8, 0x01}
      // Set NFC-F poll RC=0x00
      ,{0x00, 0x9F, 0x9A, 0x00}
      // Setting for EMD support for ISO 14443-4 Reader
      ,{0x00,0x9F,0x09,0x00} // 0x00 - Disable EMD support, 0x01 - Enable EMD support
  };
  
  static int pn544_close(hw_device_t *dev) {
      free(dev);
  
      return 0;
  }
  
  /*
   * Generic device handling
   */
  
  static int nfc_open(const hw_module_t* module, const char* name,
          hw_device_t** device) {
      if (strcmp(name, NFC_PN544_CONTROLLER) == 0) {
          nfc_pn544_device_t *dev = calloc(1, sizeof(nfc_pn544_device_t));
  
          dev->common.tag = HARDWARE_DEVICE_TAG;
          dev->common.version = 0;
          dev->common.module = (struct hw_module_t*) module;
          dev->common.close = pn544_close;
  
          dev->num_eeprom_settings = sizeof(pn544_eedata_settings) / 4;
          dev->eeprom_settings = (uint8_t*)pn544_eedata_settings;
          dev->linktype = PN544_LINK_TYPE_I2C;
          dev->device_node = "/dev/pn544";
          dev->enable_i2c_workaround = 1;
          *device = (hw_device_t*) dev;
          return 0;
      } else {
          return -EINVAL;
      }
  }
  
  static struct hw_module_methods_t nfc_module_methods = {
      .open = nfc_open,
  };
  
  struct nfc_module_t HAL_MODULE_INFO_SYM = {
      .common = {
          .tag = HARDWARE_MODULE_TAG,
          .version_major = 1,
          .version_minor = 0,
          .id = NFC_HARDWARE_MODULE_ID,
          .name = "MOTO X NFC HW HAL",
          .author = "The Android Open Source Project",
          .methods = &nfc_module_methods,
      },
  };
  