#define MAX_DEVICES 8 /* Check iio devices 0 to MAX_DEVICES-1 */
#define MAX_SENSORS 10 /* We can handle as many sensors */
#define MAX_CHANNELS 4 /* We can handle as many channels per sensor */
+#define MAX_TRIGGERS 8 /* Check for triggers 0 to MAX_TRIGGERS-1 */
-#define DEV_FILE_PATH "/dev/iio:device%d"
-
-#define BASE_PATH "/sys/bus/iio/devices/iio:device%d/"
+#define DEV_FILE_PATH "/dev/iio:device%d"
+#define BASE_PATH "/sys/bus/iio/devices/iio:device%d/"
+#define TRIGGER_FILE_PATH "/sys/bus/iio/devices/trigger%d/name"
#define CHANNEL_PATH BASE_PATH "scan_elements/"
#define ENABLE_PATH BASE_PATH "buffer/enable"
#define NAME_PATH BASE_PATH "name"
#define TRIGGER_PATH BASE_PATH "trigger/current_trigger"
-#define COMMON_OFFSET_PATH BASE_PATH "in_%s_offset"
-#define COMMON_SCALE_PATH BASE_PATH "in_%s_scale"
-#define COMMON_SAMPLING_PATH BASE_PATH "in_%s_sampling_frequency"
+#define SENSOR_OFFSET_PATH BASE_PATH "in_%s_offset"
+#define SENSOR_SCALE_PATH BASE_PATH "in_%s_scale"
+#define SENSOR_SAMPLING_PATH BASE_PATH "in_%s_sampling_frequency"
+#define DEVICE_SAMPLING_PATH BASE_PATH "sampling_frequency"
+#define DEVICE_AVAIL_FREQ_PATH BASE_PATH "sampling_frequency_available"
+#define ILLUMINATION_CALIBPATH BASE_PATH "in_illuminance_calibscale"
#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;
+ typedef int64_t max_delay_t;
+#else
+ typedef uint32_t flag_t;
+ typedef int32_t max_delay_t;
+#endif
struct channel_descriptor_t
{
+ const char *name; /* channel name ; ex: x */
+
/* sysfs entries located under scan_elements */
const char *en_path; /* Enabled sysfs file name ; ex: "in_temp_en" */
const char *type_path; /* _type sysfs file name */
/* sysfs entries located in /sys/bus/iio/devices/iio:deviceX */
const char *raw_path; /* _raw sysfs file name */
const char *input_path; /* _input sysfs file name */
+ const char *scale_path; /* _scale sysfs file name */
};
struct sensor_catalog_entry_t
{
int offset; /* Offset in bytes within the iio character device report */
int size; /* Field size in bytes */
+ float scale; /* scale for each channel */
char type_spec[MAX_TYPE_SPEC_LEN]; /* From driver; ex: le:u10/16>>0 */
struct datum_info_t type_info; /* Decoded contents of type spec */
+ float opt_scale; /* Optional correction scale read from a property such
+ * as iio.accel.x.scale, allowing late compensation of
+ * problems such as misconfigured axes ; set to 1 by
+ * default. Applied at the end of the scaling process.
+ */
};
struct sample_ops_t
float (*transform)(int s, int c, unsigned char* sample_data);
/* Function called once per sample */
- void (*finalize)(int s, struct sensors_event_t* data);
+ 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 */
- char internal_name[MAX_NAME_SIZE]; /* ex: accel_3d */
- char vendor_name[MAX_NAME_SIZE]; /* ex: Intel */
-
+ char friendly_name[MAX_NAME_SIZE]; /* ex: Accelerometer */
+ char internal_name[MAX_NAME_SIZE]; /* ex: accel_3d */
+ char vendor_name[MAX_NAME_SIZE]; /* ex: Intel */
+ char init_trigger_name[MAX_NAME_SIZE]; /* ex: accel-name-dev1 */
+ char motion_trigger_name[MAX_NAME_SIZE];/* ex: accel-any-motion-dev1 */
float max_range;
float resolution;
float power;
+ /*
+ * Currently active trigger - either a pointer to the initial (default)
+ * trigger name buffer, or a pointer to the motion trigger name buffer,
+ * or something else (typically NULL or a pointer to some static "\n".
+ * This is used to determine if the conditions are met to switch from
+ * the default trigger to the motion trigger for a sensor, or rather for
+ * the interrupt-driven sensors associated to a given iio device.
+ */
+ const char* selected_trigger;
+
float offset; /* (cooked = raw + offset) * scale */
- float scale;
+ float scale; /*default: 1. when set to 0, use channel specific value*/
+ float illumincalib; /* to set the calibration for the ALS */
- int sampling_rate; /* requested events / second */
+ float sampling_rate; /* requested events / second */
int dev_num; /* Associated iio dev num, ex: 3 for /dev/iio:device3 */
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 */
/*
* 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
+ * has to be generated before the report gets sent up to Android.
+ */
+ int64_t report_ts;
+
+ /* Buffer containing the last generated sensor report for this sensor */
unsigned char report_buffer[MAX_SENSOR_REPORT_SIZE];
- int64_t last_integration_ts; /* Last time an event was reported */
+ /* Whether or not the above buffer contains data from a device report */
+ int report_initialized;
struct sample_ops_t ops;
+ 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 */
+
+ /*
+ * Certain sensors expose their readings through sysfs files that have
+ * a long response time (100-200 ms for ALS). Rather than block our
+ * global control loop for several hundred ms each second, offload those
+ * lengthy blocking reads to dedicated threads, which will then report
+ * their data through a fd that we can add to our poll fd set.
+ */
+ int thread_data_fd[2];
+ pthread_t acquisition_thread;
+
+ /* For cal-uncal sensor pairs - index to the pair sensor in sensor_info */
+ int pair_idx;
+
+ uint32_t quirks; /* Bit mask expressing the need for special tweaks */
+
/* Note: we may have to explicitely serialize access to some fields */
+
+
+ /*
+ * If the QUIRK_FIELD_ORDERING bit is set in quirks, the contents of
+ * this array are used in the finalization stage to swap sample fields
+ * before transmitting them to Android ; they form a mapping between
+ * the indices of the input and output arrays: ex: 0123 is identity for
+ * a sample containing 4 fields.
+ */
+ unsigned char order[MAX_CHANNELS];
+
+ /* 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... */
extern int sensor_count;
+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
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