2 * Copyright (C) 2014 Intel Corporation.
8 #define MAX_DEVICES 8 /* Check iio devices 0 to MAX_DEVICES-1 */
9 #define MAX_SENSORS 10 /* We can handle as many sensors */
10 #define MAX_CHANNELS 4 /* We can handle as many channels per sensor */
12 #define DEV_FILE_PATH "/dev/iio:device%d"
14 #define BASE_PATH "/sys/bus/iio/devices/iio:device%d/"
16 #define CHANNEL_PATH BASE_PATH "scan_elements/"
17 #define ENABLE_PATH BASE_PATH "buffer/enable"
18 #define NAME_PATH BASE_PATH "name"
19 #define TRIGGER_PATH BASE_PATH "trigger/current_trigger"
20 #define SENSOR_OFFSET_PATH BASE_PATH "in_%s_offset"
21 #define SENSOR_SCALE_PATH BASE_PATH "in_%s_scale"
22 #define SENSOR_SAMPLING_PATH BASE_PATH "in_%s_sampling_frequency"
23 #define DEVICE_SAMPLING_PATH BASE_PATH "sampling_frequency"
24 #define DEVICE_AVAIL_FREQ_PATH BASE_PATH "sampling_frequency_available"
26 #define PROP_BASE "ro.iio.%s.%s" /* Note: PROPERTY_KEY_MAX is small */
28 #define MAX_TYPE_SPEC_LEN 32 /* Channel type spec len; ex: "le:u10/16>>0" */
29 #define MAX_SENSOR_REPORT_SIZE 32 /* Sensor report buffer size */
31 #define MAX_NAME_SIZE 32
33 #define ARRAY_SIZE(x) sizeof(x)/sizeof(x[0])
35 struct channel_descriptor_t
37 /* sysfs entries located under scan_elements */
38 const char *en_path; /* Enabled sysfs file name ; ex: "in_temp_en" */
39 const char *type_path; /* _type sysfs file name */
40 const char *index_path; /* _index sysfs file name */
42 /* sysfs entries located in /sys/bus/iio/devices/iio:deviceX */
43 const char *raw_path; /* _raw sysfs file name */
44 const char *input_path; /* _input sysfs file name */
47 struct sensor_catalog_entry_t
49 const char *tag; /* Prefix such as "accel", "gyro", "temp"... */
50 const int type; /* Sensor type ; ex: SENSOR_TYPE_ACCELEROMETER */
51 const int num_channels; /* Expected iio channels for this sensor */
52 struct channel_descriptor_t channel[MAX_CHANNELS];
66 int offset; /* Offset in bytes within the iio character device report */
67 int size; /* Field size in bytes */
68 char type_spec[MAX_TYPE_SPEC_LEN]; /* From driver; ex: le:u10/16>>0 */
69 struct datum_info_t type_info; /* Decoded contents of type spec */
74 /* Conversion function called once per channel */
75 float (*transform)(int s, int c, unsigned char* sample_data);
77 /* Function called once per sample */
78 void (*finalize)(int s, struct sensors_event_t* data);
83 char friendly_name[MAX_NAME_SIZE]; /* ex: Accelerometer */
84 char internal_name[MAX_NAME_SIZE]; /* ex: accel_3d */
85 char vendor_name[MAX_NAME_SIZE]; /* ex: Intel */
91 float offset; /* (cooked = raw + offset) * scale */
94 int sampling_rate; /* requested events / second */
96 int dev_num; /* Associated iio dev num, ex: 3 for /dev/iio:device3 */
99 int catalog_index;/* Associated entry within the sensor_catalog array */
101 int num_channels; /* Actual channel count ; 0 for poll mode sensors */
104 * The array below indicates where to gather report data for this
105 * sensor inside the reports that we read from the iio character device.
106 * It is updated whenever channels are enabled or disabled on the same
107 * device. Channel size indicates the size in bytes of fields, and
108 * should be zero for disabled channels. The type field indicates how a
109 * specific channel data item is structured.
111 struct channel_info_t channel[MAX_CHANNELS];
114 * This flag is set if we acquired data from the sensor but did not
115 * forward it to upper layers (i.e. Android) yet. If so, report_buffer
116 * contains that data.
120 unsigned char report_buffer[MAX_SENSOR_REPORT_SIZE];
122 int64_t last_integration_ts; /* Last time an event was reported */
124 struct sample_ops_t ops;
126 /* Note: we may have to explicitely serialize access to some fields */
129 /* Reference a few commonly used variables... */
130 extern int sensor_count;
131 extern struct sensor_info_t sensor_info[MAX_SENSORS];
132 extern struct sensor_catalog_entry_t sensor_catalog[];