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      1 /*
      2  * Copyright (C) 2008 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 <hardware/sensors.h>
     18 
     19 #include "nusensors.h"
     20 
     21 /*****************************************************************************/
     22 
     23 /*
     24  * The SENSORS Module
     25  */
     26 
     27 /*
     28  * the AK8973 has a 8-bit ADC but the firmware seems to average 16 samples,
     29  * or at least makes its calibration on 12-bits values. This increases the
     30  * resolution by 4 bits.
     31  */
     32 
     33 static const struct sensor_t sSensorList[] = {
     34         { "BMA150 3-axis Accelerometer",
     35                 "Bosh",
     36                 1, SENSORS_HANDLE_BASE+ID_A,
     37                 SENSOR_TYPE_ACCELEROMETER, 4.0f*9.81f, (4.0f*9.81f)/256.0f, 0.2f, 0, { } },
     38         { "AK8973 3-axis Magnetic field sensor",
     39                 "Asahi Kasei",
     40                 1, SENSORS_HANDLE_BASE+ID_M,
     41                 SENSOR_TYPE_MAGNETIC_FIELD, 2000.0f, 1.0f/16.0f, 6.8f, 0, { } },
     42         { "AK8973 Orientation sensor",
     43                 "Asahi Kasei",
     44                 1, SENSORS_HANDLE_BASE+ID_O,
     45                 SENSOR_TYPE_ORIENTATION, 360.0f, 1.0f, 7.0f, 0, { } },
     46         { "CM3602 Proximity sensor",
     47                 "Capella Microsystems",
     48                 1, SENSORS_HANDLE_BASE+ID_P,
     49                 SENSOR_TYPE_PROXIMITY,
     50                 PROXIMITY_THRESHOLD_CM, PROXIMITY_THRESHOLD_CM,
     51                 0.5f, 0, { } },
     52         { "CM3602 Light sensor",
     53                 "Capella Microsystems",
     54                 1, SENSORS_HANDLE_BASE+ID_L,
     55                 SENSOR_TYPE_LIGHT, 10240.0f, 1.0f, 0.5f, 0, { } },
     56 };
     57 
     58 static int open_sensors(const struct hw_module_t* module, const char* name,
     59         struct hw_device_t** device);
     60 
     61 static int sensors__get_sensors_list(struct sensors_module_t* module,
     62         struct sensor_t const** list)
     63 {
     64     *list = sSensorList;
     65     return ARRAY_SIZE(sSensorList);
     66 }
     67 
     68 static struct hw_module_methods_t sensors_module_methods = {
     69     .open = open_sensors
     70 };
     71 
     72 const struct sensors_module_t HAL_MODULE_INFO_SYM = {
     73     .common = {
     74         .tag = HARDWARE_MODULE_TAG,
     75         .version_major = 1,
     76         .version_minor = 0,
     77         .id = SENSORS_HARDWARE_MODULE_ID,
     78         .name = "AK8973A & CM3602 Sensors Module",
     79         .author = "The Android Open Source Project",
     80         .methods = &sensors_module_methods,
     81     },
     82     .get_sensors_list = sensors__get_sensors_list
     83 };
     84 
     85 /*****************************************************************************/
     86 
     87 static int open_sensors(const struct hw_module_t* module, const char* name,
     88         struct hw_device_t** device)
     89 {
     90     return init_nusensors(module, device);
     91 }
     92