Home | History | Annotate | Download | only in sensor_hub 
      1 /*
      2  * Copyright (C) 2008-2014 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 #ifndef CROS_EC_SENSORS_H
     18 #define CROS_EC_SENSORS_H
     19 
     20 #include <errno.h>
     21 #include <stdint.h>
     22 #include <sys/cdefs.h>
     23 #include <sys/types.h>
     24 #include <utils/BitSet.h>
     25 
     26 #include <hardware/sensors.h>
     27 
     28 #define IIO_DIR  "/sys/bus/iio/devices/"
     29 #define IIO_MAX_NAME_LENGTH 30
     30 #define IIO_MAX_BUFF_SIZE 4096
     31 #define INT32_CHAR_LEN 12
     32 
     33 /*
     34  * Use sizeof(...) - 1 instead of strlen because clang FORTIFY makes strlen
     35  * non-constant.
     36  */
     37 #define IIO_MAX_DEVICE_NAME_LENGTH (sizeof(IIO_DIR) - 1 + IIO_MAX_NAME_LENGTH)
     38 
     39 #define CROS_EC_MAX_SAMPLING_PERIOD ((1 << 16) - 2)
     40 
     41 enum {X, Y, Z, MAX_AXIS};
     42 
     43 extern const char *cros_ec_sensor_names[];
     44 
     45 #define CROS_EC_EVENT_FLUSH_FLAG 0x1
     46 #define CROS_EC_EVENT_WAKEUP_FLAG 0x2
     47 
     48 #define CROS_EC_MAX_PHYSICAL_SENSOR 256
     49 
     50 enum cros_ec_gesture {
     51     CROS_EC_SIGMO,
     52     CROS_EC_MAX_GESTURE,
     53 };
     54 
     55 
     56 /*****************************************************************************/
     57 /* from ec_commands.h */
     58 struct cros_ec_event {
     59     uint8_t sensor_id;
     60     uint8_t flags;
     61     union {
     62         int16_t vector[MAX_AXIS];
     63         struct {
     64             uint8_t activity;
     65             uint8_t state;
     66             uint16_t add_info[2];
     67         };
     68     };
     69     uint64_t timestamp;
     70 } __packed;
     71 
     72 enum motionsensor_activity {
     73     MOTIONSENSE_ACTIVITY_RESERVED = 0,
     74     MOTIONSENSE_ACTIVITY_SIG_MOTION = 1,
     75     MOTIONSENSE_MAX_ACTIVITY,
     76 };
     77 
     78 
     79 /*****************************************************************************/
     80 
     81 enum cros_ec_sensor_device {
     82     CROS_EC_ACCEL,
     83     CROS_EC_GYRO,
     84     CROS_EC_MAG,
     85     CROS_EC_PROX,
     86     CROS_EC_LIGHT,
     87     CROS_EC_ACTIVITY,
     88     CROS_EC_RING, /* should be the last device */
     89     CROS_EC_MAX_DEVICE,
     90 };
     91 
     92 struct cros_ec_sensor_info {
     93     /* description of the sensor, as reported to sensorservice. */
     94     sensor_t sensor_data;
     95     enum cros_ec_sensor_device type;
     96     const char *device_name;
     97     int64_t sampling_period_ns;
     98     int64_t max_report_latency_ns;
     99     bool enabled;
    100 };
    101 
    102 struct cros_ec_gesture_info {
    103     /* For activities managed by the sensor interface */
    104     sensor_t sensor_data;
    105     const char *device_name;
    106     const char *enable_entry;
    107     bool enabled;
    108 };
    109 
    110 /*
    111  * To write sysfs parameters: IIO_DIR is appended before path.
    112  */
    113 int cros_ec_sysfs_set_input_attr(const char *path, const char *attr, const char *value, size_t len);
    114 int cros_ec_sysfs_set_input_attr_by_int(const char *path, const char *attr, int value);
    115 
    116 /*
    117  * To read sysfs parameters: IIO_DIR is NOT appended.
    118  */
    119 int cros_ec_sysfs_get_attr(const char *path, const char *attr, char *output);
    120 
    121 class CrosECSensor {
    122     struct cros_ec_sensor_info *mSensorInfo;
    123     size_t mSensorNb;
    124     struct cros_ec_gesture_info *mGestureInfo;
    125     size_t mGestureNb;
    126     char mRingPath[IIO_MAX_DEVICE_NAME_LENGTH];
    127     cros_ec_event mEvents[IIO_MAX_BUFF_SIZE];
    128     int mDataFd;
    129 
    130     int processEvent(sensors_event_t* data, const cros_ec_event *event);
    131 public:
    132     CrosECSensor(
    133         struct cros_ec_sensor_info *sensor_info,
    134         size_t sensor_nb,
    135         struct cros_ec_gesture_info *gesture_info,
    136         size_t gesture_nb,
    137         const char *ring_device_name,
    138         const char *trigger_name);
    139     virtual ~CrosECSensor();
    140     virtual int getFd(void);
    141     int readEvents(sensors_event_t* data, int count);
    142 
    143     virtual int activate(int handle, int enabled);
    144     virtual int batch(int handle, int64_t period_ns, int64_t timeout);
    145     virtual int flush(int handle);
    146 };
    147 
    148 #endif  // CROS_EC_SENSORS_H
    149