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 */
32 #define MAX_DEVICE_REPORT_SIZE 32 /* iio device scan buffer size */
34 #define MAX_NAME_SIZE 32
36 #define MAX_SENSOR_BASES 3 /* Max number of base sensors a sensor can rely on */
38 #define ARRAY_SIZE(x) sizeof(x)/sizeof(x[0])
39 #define REPORTING_MODE(x) ((x) & 0x06)
44 const char *name; /* channel name ; ex: x */
46 /* sysfs entries located under scan_elements */
47 const char *en_path; /* Enabled sysfs file name ; ex: "in_temp_en" */
48 const char *type_path; /* _type sysfs file name */
49 const char *index_path; /* _index sysfs file name */
51 /* sysfs entries located in /sys/bus/iio/devices/iio:deviceX */
52 const char *raw_path; /* _raw sysfs file name */
53 const char *input_path; /* _input sysfs file name */
54 const char *scale_path; /* _scale sysfs file name */
61 const char *tag; /* Prefix such as "accel", "gyro", "temp"... */
62 const int type; /* Sensor type ; ex: SENSOR_TYPE_ACCELEROMETER */
63 const int num_channels; /* Expected iio channels for this sensor */
64 const int is_virtual; /* Is the sensor virtual or not */
65 channel_descriptor_t channel[MAX_CHANNELS];
67 sensor_catalog_entry_t;
83 int offset; /* Offset in bytes within the iio character device report */
84 int size; /* Field size in bytes */
85 float scale; /* scale for each channel */
86 char type_spec[MAX_TYPE_SPEC_LEN]; /* From driver; ex: le:u10/16>>0 */
87 datum_info_t type_info; /* Decoded contents of type spec */
89 * Optional correction scale read from a property such as iio.accel.x.scale, allowing late compensation of
90 * problems such as misconfigured axes ; set to 1 by default. Applied at the end of the scaling process.
98 /* Conversion function called once per channel */
99 float (*transform) (int s, int c, unsigned char* sample_data);
101 /* Function called once per sample */
102 int (*finalize) (int s, sensors_event_t* data);
108 * Whenever we have sensor data recorded for a sensor in the associated
109 * sensor cell, its report_pending field is set to a non-zero value
110 * indicating how we got this data.
112 #define DATA_TRIGGER 1 /* From /dev/iio:device fd */
113 #define DATA_SYSFS 2 /* Through polling */
114 #define DATA_DUPLICATE 3 /* Duplicate of triggered motion sample */
119 char friendly_name[MAX_NAME_SIZE]; /* ex: Accelerometer */
120 char internal_name[MAX_NAME_SIZE]; /* ex: accel_3d */
121 char vendor_name[MAX_NAME_SIZE]; /* ex: Intel */
122 char init_trigger_name[MAX_NAME_SIZE]; /* ex: accel-name-dev1 */
123 char motion_trigger_name[MAX_NAME_SIZE];/* ex: accel-any-motion-dev1 */
129 * Currently active trigger - either a pointer to the initial (default) trigger name buffer, or a pointer to the motion trigger name buffer,
130 * 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
131 * the default trigger to the motion trigger for a sensor, or rather for the interrupt-driven sensors associated to a given iio device.
133 const char* selected_trigger;
135 float offset; /* (cooked = raw + offset) * scale */
136 float scale; /* default:1. when set to 0, use channel specific value */
137 float illumincalib; /* to set the calibration for the ALS */
139 float requested_rate; /* requested events / second */
140 float sampling_rate; /* setup events / second */
142 float min_supported_rate;
143 float max_supported_rate;
145 int dev_num; /* Associated iio dev num, ex: 3 for /dev/iio:device3 */
147 int catalog_index; /* Associated entry within the sensor_catalog array */
148 int type; /* Sensor type, such as SENSOR_TYPE_GYROSCOPE */
150 int num_channels; /* Actual channel count ; 0 for poll mode sensors */
152 int is_polling; /* 1 if we use the sensor in poll mode, 0 if triggered */
155 * The array below indicates where to gather report data for this sensor inside the reports that we read from the iio character device.
156 * It is updated whenever channels are enabled or disabled on the same device. Channel size indicates the size in bytes of fields, and
157 * should be zero for disabled channels. The type field indicates how a specific channel data item is structured.
159 channel_info_t channel[MAX_CHANNELS];
162 * 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
163 * contains that data. Valid values are 0: empty, 1: normal, 2: repeat of last acquired value after timeout.
167 /* This flag is set if we have a meta data event pending */
168 int meta_data_pending;
171 * Timestamp closely matching the date of sampling, preferably retrieved from a iio channel alongside sample data. Value zero indicates that
172 * we couldn't get such a closely correlated timestamp, and that one has to be generated before the report gets sent up to Android.
176 /* Buffer containing the last generated sensor report for this sensor */
177 unsigned char report_buffer[MAX_SENSOR_REPORT_SIZE];
179 /* Whether or not the above buffer contains data from a device report */
180 int report_initialized;
182 /* Channel and sample finalization callbacks for this sensor */
185 int cal_level; /* 0 means not calibrated */
188 * Depending on the sensor, calibration may take too much time at higher levels. Allow optional capping to a certain level.
192 void *cal_data; /* Sensor calibration data, e.g. for magnetometer */
194 /* Filtering data for noisy sensors */
197 float prev_val; /* Previously reported value, for on-change sensors */
200 * Certain sensors expose their readings through sysfs files that have a long response time (100-200 ms for ALS). Rather than block our
201 * global control loop for several hundred ms each second, offload those lengthy blocking reads to dedicated threads, which will then report
202 * their data through a fd that we can add to our poll fd set.
204 int thread_data_fd[2];
205 pthread_t acquisition_thread;
207 int base_count; /* How many base sensors is the sensor depending on */
208 int base[MAX_SENSOR_BASES];
210 uint32_t quirks; /* Bit mask expressing the need for special tweaks */
212 /* Note: we may have to explicitely serialize access to some fields */
214 int is_virtual; /* Composite sensor, exposed from data acquired through other sensors */
216 uint32_t ref_count; /* Dependency count - for a real sensor how many active virtual sensors are depending on it */
218 uint32_t directly_enabled; /* Flag showing if a sensor was enabled directly by Android */
221 * 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
222 * more than one at a later time.
224 sensors_event_t sample;
227 * 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
228 * before transmitting them to Android ; they form a mapping between the indices of the input and output arrays: ex: 0123 is identity for
229 * a sample containing 4 fields.
231 unsigned char order[MAX_CHANNELS];
233 /* A few variables used for data filtering */
234 float *history; /* Working buffer containing recorded samples */
235 float *history_sum; /* The current sum of the history elements */
236 int history_size; /* Number of recorded samples */
237 int history_entries; /* How many of these are initialized */
238 int history_index; /* Index of sample to evict next time */
241 * 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
242 * events before filtering kicks in. We can also use it for statistics.
244 uint64_t event_count;
249 /* Reference a few commonly used variables... */
250 extern int sensor_count;
251 extern struct sensor_t sensor_desc[MAX_SENSORS];
252 extern sensor_info_t sensor[MAX_SENSORS];
253 extern sensor_catalog_entry_t sensor_catalog[];