GMINL-2659: Keep recent events history for fusion-like processing

[android-x86/hardware-intel-libsensors.git] / common.h

diff --git a/common.h b/common.h
index 7fdadf2..fd673ac 100644 (file)
--- a/common.h
+++ b/common.h
@@ -27,12 +27,16 @@
 
 #define PROP_BASE      "ro.iio.%s.%s" /* Note: PROPERTY_KEY_MAX is small */
 
+#define MAX_EVENTS 400         /* 400 Hz */
 #define MAX_TYPE_SPEC_LEN 32   /* Channel type spec len; ex: "le:u10/16>>0" */
 #define MAX_SENSOR_REPORT_SIZE 32      /* Sensor report buffer size */
 
 #define MAX_NAME_SIZE          32
 
+#define MIN_SAMPLES 5
+
 #define ARRAY_SIZE(x) sizeof(x)/sizeof(x[0])
+#define REPORTING_MODE(x)      ((x) & 0x06)
 
 #ifdef __LP64__
        typedef uint64_t flag_t;
@@ -97,6 +101,15 @@ struct sample_ops_t
        int (*finalize)(int s, struct sensors_event_t* data);
 };
 
+/*
+ * Whenever we have sensor data recorded for a sensor in the associated
+ * sensor_info cell, its report_pending field is set to a non-zero value
+ * indicating how we got this data.
+ */
+#define DATA_TRIGGER   1       /* From /dev/iio:device fd              */
+#define DATA_SYSFS     2       /* Through polling                      */
+#define DATA_DUPLICATE 3       /* Duplicate of triggered motion sample */
+
 struct sensor_info_t
 {
        char friendly_name[MAX_NAME_SIZE];      /* ex: Accelerometer         */
@@ -128,6 +141,7 @@ struct sensor_info_t
        int enable_count;
 
        int catalog_index;/* Associated entry within the sensor_catalog array */
+       int type;         /* Sensor type, such as SENSOR_TYPE_GYROSCOPE       */
 
        int num_channels; /* Actual channel count ; 0 for poll mode sensors */
 
@@ -144,11 +158,17 @@ struct sensor_info_t
        /*
         * This flag is set if we acquired data from the sensor but did not
         * forward it to upper layers (i.e. Android) yet. If so, report_buffer
-        * contains that data.
+        * contains that data. Valid values are 0: empty, 1: normal, 2: repeat
+        * of last acquired value after timeout.
         */
        int report_pending;
 
        /*
+        * This flag is set if we have a meta data event pending
+        */
+       volatile int meta_data_pending;
+
+       /*
         * Timestamp closely matching the date of sampling, preferably retrieved
         * from a iio channel alongside sample data. Value zero indicates that
         * we couldn't get such a closely correlated timestamp, and that one
@@ -167,6 +187,9 @@ struct sensor_info_t
        int cal_level; /* 0 means not calibrated */
        void* cal_data;
 
+       /* Filtering data for noisy sensors */
+       void* filter;
+
        float prev_val; /* Previously reported value, for on-change sensors */
 
        /*
@@ -198,9 +221,17 @@ struct sensor_info_t
 
        /* A few variables used for data filtering */
        float *history;         /* Working buffer containing recorded samples */
+       float *history_sum;     /* The current sum of the history elements    */
        int history_size;       /* Number of recorded samples                 */
        int history_entries;    /* How many of these are initialized          */
        int history_index;      /* Index of sample to evict next time         */
+
+       /*
+        * Event counter - will be used to check if we have a significant sample
+        * for noisy sensors. We want to make sure we do not send any wrong
+        * events before filtering kicks in. We can also use it for statistics.
+        */
+       uint64_t event_count;
 };
 
 /* Reference a few commonly used variables... */
@@ -209,4 +240,7 @@ extern struct sensor_t      sensor_desc[MAX_SENSORS];
 extern struct sensor_info_t            sensor_info[MAX_SENSORS];
 extern struct sensor_catalog_entry_t   sensor_catalog[];
 
+/* We are required to be in sync with SystemClock.getNanos */
+extern int64_t ts_delta;
+
 #endif