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 */
11 #define MAX_TRIGGERS 8 /* Check for triggers 0 to MAX_TRIGGERS-1 */
13 #define DEV_FILE_PATH "/dev/iio:device%d"
14 #define BASE_PATH "/sys/bus/iio/devices/iio:device%d/"
15 #define TRIGGER_FILE_PATH "/sys/bus/iio/devices/trigger%d/name"
17 #define CHANNEL_PATH BASE_PATH "scan_elements/"
18 #define ENABLE_PATH BASE_PATH "buffer/enable"
19 #define NAME_PATH BASE_PATH "name"
20 #define TRIGGER_PATH BASE_PATH "trigger/current_trigger"
21 #define SENSOR_OFFSET_PATH BASE_PATH "in_%s_offset"
22 #define SENSOR_SCALE_PATH BASE_PATH "in_%s_scale"
23 #define SENSOR_SAMPLING_PATH BASE_PATH "in_%s_sampling_frequency"
24 #define DEVICE_SAMPLING_PATH BASE_PATH "sampling_frequency"
25 #define DEVICE_AVAIL_FREQ_PATH BASE_PATH "sampling_frequency_available"
26 #define ILLUMINATION_CALIBPATH BASE_PATH "in_illuminance_calibscale"
28 #define PROP_BASE "ro.iio.%s.%s" /* Note: PROPERTY_KEY_MAX is small */
30 #define MAX_TYPE_SPEC_LEN 32 /* Channel type spec len; ex: "le:u10/16>>0" */
31 #define MAX_SENSOR_REPORT_SIZE 32 /* Sensor report buffer size */
33 #define MAX_NAME_SIZE 32
35 #define ARRAY_SIZE(x) sizeof(x)/sizeof(x[0])
38 typedef uint64_t flag_t;
40 typedef uint32_t flag_t;
43 struct channel_descriptor_t
45 const char *name; /* channel name ; ex: x */
47 /* sysfs entries located under scan_elements */
48 const char *en_path; /* Enabled sysfs file name ; ex: "in_temp_en" */
49 const char *type_path; /* _type sysfs file name */
50 const char *index_path; /* _index sysfs file name */
52 /* sysfs entries located in /sys/bus/iio/devices/iio:deviceX */
53 const char *raw_path; /* _raw sysfs file name */
54 const char *input_path; /* _input sysfs file name */
55 const char *scale_path; /* _scale sysfs file name */
58 struct sensor_catalog_entry_t
60 const char *tag; /* Prefix such as "accel", "gyro", "temp"... */
61 const int type; /* Sensor type ; ex: SENSOR_TYPE_ACCELEROMETER */
62 const int num_channels; /* Expected iio channels for this sensor */
63 struct channel_descriptor_t channel[MAX_CHANNELS];
77 int offset; /* Offset in bytes within the iio character device report */
78 int size; /* Field size in bytes */
79 float scale; /* scale for each channel */
80 char type_spec[MAX_TYPE_SPEC_LEN]; /* From driver; ex: le:u10/16>>0 */
81 struct datum_info_t type_info; /* Decoded contents of type spec */
82 float opt_scale; /* Optional correction scale read from a property such
83 * as iio.accel.x.scale, allowing late compensation of
84 * problems such as misconfigured axes ; set to 1 by
85 * default. Applied at the end of the scaling process.
91 /* Conversion function called once per channel */
92 float (*transform)(int s, int c, unsigned char* sample_data);
94 /* Function called once per sample */
95 int (*finalize)(int s, struct sensors_event_t* data);
100 char friendly_name[MAX_NAME_SIZE]; /* ex: Accelerometer */
101 char internal_name[MAX_NAME_SIZE]; /* ex: accel_3d */
102 char vendor_name[MAX_NAME_SIZE]; /* ex: Intel */
103 char trigger_name[MAX_NAME_SIZE]; /* ex: accel-name-dev1 */
108 float offset; /* (cooked = raw + offset) * scale */
109 float scale; /*default: 1. when set to 0, use channel specific value*/
110 float illumincalib; /* to set the calibration for the ALS */
112 float sampling_rate; /* requested events / second */
114 int dev_num; /* Associated iio dev num, ex: 3 for /dev/iio:device3 */
117 int catalog_index;/* Associated entry within the sensor_catalog array */
119 int num_channels; /* Actual channel count ; 0 for poll mode sensors */
122 * The array below indicates where to gather report data for this
123 * sensor inside the reports that we read from the iio character device.
124 * It is updated whenever channels are enabled or disabled on the same
125 * device. Channel size indicates the size in bytes of fields, and
126 * should be zero for disabled channels. The type field indicates how a
127 * specific channel data item is structured.
129 struct channel_info_t channel[MAX_CHANNELS];
132 * This flag is set if we acquired data from the sensor but did not
133 * forward it to upper layers (i.e. Android) yet. If so, report_buffer
134 * contains that data.
139 * Timestamp closely matching the date of sampling, preferably retrieved
140 * from a iio channel alongside sample data. Value zero indicates that
141 * we couldn't get such a closely correlated timestamp, and that one
142 * has to be generated before the report gets sent up to Android.
146 /* Buffer containing the last generated sensor report for this sensor */
147 unsigned char report_buffer[MAX_SENSOR_REPORT_SIZE];
149 /* Whether or not the above buffer contains data from a device report */
150 int report_initialized;
152 struct sample_ops_t ops;
157 float prev_val; /* Previously reported value, for on-change sensors */
160 * Certain sensors expose their readings through sysfs files that have
161 * a long response time (100-200 ms for ALS). Rather than block our
162 * global control loop for several hundred ms each second, offload those
163 * lengthy blocking reads to dedicated threads, which will then report
164 * their data through a fd that we can add to our poll fd set.
166 int thread_data_fd[2];
167 pthread_t acquisition_thread;
169 /* For cal-uncal sensor pairs - index to the pair sensor in sensor_info */
172 uint32_t quirks; /* Bit mask expressing the need for special tweaks */
174 /* Note: we may have to explicitely serialize access to some fields */
178 * If the QUIRK_FIELD_ORDERING bit is set in quirks, the contents of
179 * this array are used in the finalization stage to swap sample fields
180 * before transmitting them to Android ; they form a mapping between
181 * the indices of the input and output arrays: ex: 0123 is identity for
182 * a sample containing 4 fields.
184 unsigned char order[MAX_CHANNELS];
187 /* Reference a few commonly used variables... */
188 extern int sensor_count;
189 extern struct sensor_info_t sensor_info[MAX_SENSORS];
190 extern struct sensor_catalog_entry_t sensor_catalog[];