#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 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_DEVICE_REPORT_SIZE 32 /* iio device scan buffer size */
#define MAX_NAME_SIZE 32
-#define ARRAY_SIZE(x) sizeof(x)/sizeof(x[0])
+#define MAX_REAL_DEP 3 /* Max number of base sensors a sensor can depend on */
+#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 *tag; /* Prefix such as "accel", "gyro", "temp"... */
const int type; /* Sensor type ; ex: SENSOR_TYPE_ACCELEROMETER */
const int num_channels; /* Expected iio channels for this sensor */
+ const int is_virtual; /* Is the sensor virtual or not */
struct channel_descriptor_t channel[MAX_CHANNELS];
};
int (*finalize)(int s, struct sensors_event_t* data);
};
+/*
+ * Whenever we have sensor data recorded for a sensor in the associated
+ * sensor 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; /*default: 1. when set to 0, use channel specific value*/
+ float scale; /*default:1. when set to 0, use channel specific value*/
float illumincalib; /* to set the calibration for the ALS */
- float sampling_rate; /* requested events / second */
+ float requested_rate; /* requested events / second */
+ float sampling_rate; /* setup 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
+ */
+ 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
*/
int64_t report_ts;
+ /* Buffer containing the last generated sensor report for this sensor */
unsigned char report_buffer[MAX_SENSOR_REPORT_SIZE];
+ /* Whether or not the above buffer contains data from a device report */
+ int report_initialized;
+
+ /* Channel and sample finalization callbacks for this sensor */
struct sample_ops_t ops;
- int calibrated;
- void* cal_data;
+ int cal_level; /* 0 means not calibrated */
+
+ /*
+ * Depending on the sensor, calibration may take too much time at
+ * higher levels. Allow optional capping to a certain level.
+ */
+ int max_cal_level;
+
+ void *cal_data; /* Sensor calibration data, e.g. for magnetometer */
+
+ /* Filtering data for noisy sensors */
+ void* filter;
float prev_val; /* Previously reported value, for on-change sensors */
int thread_data_fd[2];
pthread_t acquisition_thread;
+ /* How many base sensors is the sensor depending on */
+ int base_count;
+ int base_idx[MAX_REAL_DEP];
+
+ uint32_t quirks; /* Bit mask expressing the need for special tweaks */
+
/* Note: we may have to explicitely serialize access to some fields */
+
+ int is_virtual;
+ /*
+ * Dependency count - for a real sensor how many active virtual sensors are
+ * depending on it
+ */
+ uint32_t ref_count;
+
+ /*
+ * Flag showing if a sensor was enabled directly by Android
+ */
+ uint32_t directly_enabled;
+
+ /*
+ * Current sample for a virtual sensor - when a report is ready we'll
+ * keep the data here until it's finally processed. Can be modified for
+ * more than one at a later time.
+ */
+ struct sensors_event_t sample;
+
+ /*
+ * 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_info_t sensor_info[MAX_SENSORS];
+extern struct sensor_t sensor_desc[MAX_SENSORS];
+extern struct sensor_info_t sensor[MAX_SENSORS];
extern struct sensor_catalog_entry_t sensor_catalog[];
#endif
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