#include <utils/Log.h>
#include <cutils/properties.h>
#include <hardware/sensors.h>
+#include "common.h"
#include "enumeration.h"
+#include "description.h"
#define IIO_SENSOR_HAL_VERSION 1
+/*
+ * About properties
+ *
+ * We acquire a number of parameters about sensors by reading properties.
+ * The idea here is that someone (either a script, or daemon, sets them
+ * depending on the set of sensors present on the machine.
+ *
+ * There are fallback paths in case the properties are not defined, but it is
+ * highly desirable to at least have the following for each sensor:
+ *
+ * ro.iio.anglvel.name = Gyroscope
+ * ro.iio.anglvel.vendor = Intel
+ * ro.iio.anglvel.max_range = 35
+ * ro.iio.anglvel.resolution = 0.002
+ * ro.iio.anglvel.power = 6.1
+ *
+ * Besides these, we have a couple of knobs initially used to cope with Intel
+ * Sensor Hub oddities, such as HID inspired units or firmware bugs:
+ *
+ * ro.iio.anglvel.transform = ISH
+ * ro.iio.anglvel.quirks = init-rate
+ *
+ * The "terse" quirk indicates that the underlying driver only sends events
+ * when the sensor reports a change. The HAL then periodically generates
+ * duplicate events so the sensor behaves as a continously firing one.
+ *
+ * The "noisy" quirk indicates that the underlying driver has a unusually high
+ * level of noise in its readings, and that the HAL has to accomodate it
+ * somehow, e.g. in the magnetometer calibration code path.
+ *
+ * This one is used specifically to pass a calibration scale to ALS drivers:
+ *
+ * ro.iio.illuminance.name = CPLM3218x Ambient Light Sensor
+ * ro.iio.illuminance.vendor = Capella Microsystems
+ * ro.iio.illuminance.max_range = 167000
+ * ro.iio.illuminance.resolution = 1
+ * ro.iio.illuminance.power = .001
+ * ro.iio.illuminance.illumincalib = 7400
+ *
+ * There's a 'opt_scale' specifier, documented as follows:
+ *
+ * This adds support for a scaling factor that can be expressed
+ * using properties, for all sensors, on a channel basis. That
+ * scaling factor is applied after all other transforms have been
+ * applied, and is intended as a way to compensate for problems
+ * such as an incorrect axis polarity for a given sensor.
+ *
+ * The syntax is <usual property prefix>.<channel>.opt_scale, e.g.
+ * ro.iio.accel.y.opt_scale = -1 to negate the sign of the y readings
+ * for the accelerometer.
+ *
+ * For sensors using a single channel - and only those - the channel
+ * name is implicitly void and a syntax such as ro.iio.illuminance.
+ * opt_scale = 3 has to be used.
+ *
+ * 'panel' and 'rotation' specifiers can be used to express ACPI PLD placement
+ * information ; if found they will be used in priority over the actual ACPI
+ * data. That is intended as a way to verify values during development.
+ *
+ * It's possible to use the contents of the iio device name as a way to
+ * discriminate between sensors. Several sensors of the same type can coexist:
+ * e.g. ro.iio.temp.bmg160.name = BMG160 Thermometer will be used in priority
+ * over ro.iio.temp.name = BMC150 Thermometer if the sensor for which we query
+ * properties values happen to have its iio device name set to bmg160.
+ */
static int sensor_get_st_prop (int s, const char* sel, char val[MAX_NAME_SIZE])
{
char prop_name[PROP_NAME_MAX];
char prop_val[PROP_VALUE_MAX];
+ char extended_sel[PROP_VALUE_MAX];
+
int i = sensor_info[s].catalog_index;
const char *prefix = sensor_catalog[i].tag;
+ /* First try most specialized form, like ro.iio.anglvel.bmg160.name */
+
+ snprintf(extended_sel, PROP_NAME_MAX, "%s.%s",
+ sensor_info[s].internal_name, sel);
+
+ snprintf(prop_name, PROP_NAME_MAX, PROP_BASE, prefix, extended_sel);
+
+ if (property_get(prop_name, prop_val, "")) {
+ strncpy(val, prop_val, MAX_NAME_SIZE-1);
+ val[MAX_NAME_SIZE-1] = '\0';
+ return 0;
+ }
+
+ /* Fall back to simple form, like ro.iio.anglvel.name */
+
sprintf(prop_name, PROP_BASE, prefix, sel);
if (property_get(prop_name, prop_val, "")) {
}
-static int sensor_get_fl_prop (int s, const char* sel, float* val)
+int sensor_get_prop (int s, const char* sel, int* val)
+{
+ char buf[MAX_NAME_SIZE];
+
+ if (sensor_get_st_prop(s, sel, buf))
+ return -1;
+
+ *val = atoi(buf);
+ return 0;
+}
+
+
+int sensor_get_fl_prop (int s, const char* sel, float* val)
{
char buf[MAX_NAME_SIZE];
if (sensor_info[s].internal_name[0]) {
snprintf(sensor_info[s].friendly_name, MAX_NAME_SIZE, "S%d-%s",
s, sensor_info[s].internal_name);
- sensor_info[s].friendly_name[MAX_NAME_SIZE-1] = '\0';
} else {
sprintf(sensor_info[s].friendly_name, "S%d", s);
}
return 0;
}
+
+
+uint32_t sensor_get_quirks (int s)
+{
+ char quirks_buf[MAX_NAME_SIZE];
+
+ /* Read and decode quirks property on first reference */
+ if (!(sensor_info[s].quirks & QUIRK_ALREADY_DECODED)) {
+ quirks_buf[0] = '\0';
+ sensor_get_st_prop(s, "quirks", quirks_buf);
+
+ if (strstr(quirks_buf, "init-rate"))
+ sensor_info[s].quirks |= QUIRK_INITIAL_RATE;
+
+ if (strstr(quirks_buf, "continuous")) {
+ sensor_info[s].quirks |= QUIRK_CONTINUOUS_DRIVER;
+ }
+
+ if (strstr(quirks_buf, "terse") && !(sensor_info[s].quirks & QUIRK_CONTINUOUS_DRIVER))
+ sensor_info[s].quirks |= QUIRK_TERSE_DRIVER;
+
+ if (strstr(quirks_buf, "noisy"))
+ sensor_info[s].quirks |= QUIRK_NOISY;
+
+ sensor_info[s].quirks |= QUIRK_ALREADY_DECODED;
+ }
+
+ return sensor_info[s].quirks;
+}
+
+
+int sensor_get_order (int s, unsigned char map[MAX_CHANNELS])
+{
+ char buf[MAX_NAME_SIZE];
+ int i;
+ int count = sensor_catalog[sensor_info[s].catalog_index].num_channels;
+
+ if (sensor_get_st_prop(s, "order", buf))
+ return 0; /* No order property */
+
+ /* Assume ASCII characters, in the '0'..'9' range */
+
+ for (i=0; i<count; i++)
+ if (buf[i] - '0' >= count) {
+ ALOGE("Order index out of range for sensor %d\n", s);
+ return 0;
+ }
+
+ for (i=0; i<count; i++)
+ map[i] = buf[i] - '0';
+
+ return 1; /* OK to use modified ordering map */
+}
+
+char* sensor_get_string_type(int s)
+{
+ int catalog_index;
+ int sensor_type;
+
+ catalog_index = sensor_info[s].catalog_index;
+ sensor_type = sensor_catalog[catalog_index].type;
+
+ switch (sensor_type) {
+ case SENSOR_TYPE_ACCELEROMETER:
+ return SENSOR_STRING_TYPE_ACCELEROMETER;
+
+ case SENSOR_TYPE_MAGNETIC_FIELD:
+ return SENSOR_STRING_TYPE_MAGNETIC_FIELD;
+
+ case SENSOR_TYPE_ORIENTATION:
+ return SENSOR_STRING_TYPE_ORIENTATION;
+
+ case SENSOR_TYPE_GYROSCOPE:
+ return SENSOR_STRING_TYPE_GYROSCOPE;
+
+ case SENSOR_TYPE_GYROSCOPE_UNCALIBRATED:
+ return SENSOR_STRING_TYPE_GYROSCOPE_UNCALIBRATED;
+
+ case SENSOR_TYPE_LIGHT:
+ return SENSOR_STRING_TYPE_LIGHT;
+
+ case SENSOR_TYPE_AMBIENT_TEMPERATURE:
+ return SENSOR_STRING_TYPE_AMBIENT_TEMPERATURE;
+
+ case SENSOR_TYPE_TEMPERATURE:
+ return SENSOR_STRING_TYPE_TEMPERATURE;
+
+ case SENSOR_TYPE_PROXIMITY:
+ return SENSOR_STRING_TYPE_PROXIMITY;
+
+ case SENSOR_TYPE_PRESSURE:
+ return SENSOR_STRING_TYPE_PRESSURE;
+
+ case SENSOR_TYPE_RELATIVE_HUMIDITY:
+ return SENSOR_STRING_TYPE_RELATIVE_HUMIDITY;
+
+ default:
+ return "";
+ }
+}
+
+flag_t sensor_get_flags (int s)
+{
+ int catalog_index;
+ int sensor_type;
+
+ flag_t flags = 0x0;
+ catalog_index = sensor_info[s].catalog_index;
+ sensor_type = sensor_catalog[catalog_index].type;
+
+ switch (sensor_type) {
+ case SENSOR_TYPE_ACCELEROMETER:
+ case SENSOR_TYPE_MAGNETIC_FIELD:
+ case SENSOR_TYPE_ORIENTATION:
+ case SENSOR_TYPE_GYROSCOPE:
+ case SENSOR_TYPE_GYROSCOPE_UNCALIBRATED:
+ case SENSOR_TYPE_PRESSURE:
+ flags |= SENSOR_FLAG_CONTINUOUS_MODE;
+ break;
+
+ case SENSOR_TYPE_LIGHT:
+ case SENSOR_TYPE_AMBIENT_TEMPERATURE:
+ case SENSOR_TYPE_TEMPERATURE:
+ case SENSOR_TYPE_RELATIVE_HUMIDITY:
+ flags |= SENSOR_FLAG_ON_CHANGE_MODE;
+ break;
+
+
+ case SENSOR_TYPE_PROXIMITY:
+ flags |= SENSOR_FLAG_WAKE_UP;
+ flags |= SENSOR_FLAG_ON_CHANGE_MODE;
+ break;
+
+ default:
+ ALOGI("Unknown sensor");
+ }
+ return flags;
+}
+
+int get_cdd_freq(int s, int must)
+{
+ int catalog_index = sensor_info[s].catalog_index;
+ int sensor_type = sensor_catalog[catalog_index].type;
+
+ switch (sensor_type) {
+ case SENSOR_TYPE_ACCELEROMETER:
+ return (must ? 100 : 200); /* must 100 Hz, should 200 Hz, CDD compliant */
+ case SENSOR_TYPE_GYROSCOPE:
+ case SENSOR_TYPE_GYROSCOPE_UNCALIBRATED:
+ return (must ? 200 : 200); /* must 200 Hz, should 200 Hz, CDD compliant */
+ case SENSOR_TYPE_MAGNETIC_FIELD:
+ return (must ? 10 : 50); /* must 10 Hz, should 50 Hz, CDD compliant */
+ case SENSOR_TYPE_LIGHT:
+ case SENSOR_TYPE_AMBIENT_TEMPERATURE:
+ case SENSOR_TYPE_TEMPERATURE:
+ return (must ? 1 : 2); /* must 1 Hz, should 2Hz, not mentioned in CDD */
+ default:
+ return 0;
+ }
+}
+
+/* This value is defined only for continuous mode and on-change sensors. It is the delay between
+ * two sensor events corresponding to the lowest frequency that this sensor supports. When lower
+ * frequencies are requested through batch()/setDelay() the events will be generated at this
+ * frequency instead. It can be used by the framework or applications to estimate when the batch
+ * FIFO may be full.
+ *
+ * NOTE: 1) period_ns is in nanoseconds where as maxDelay/minDelay are in microseconds.
+ * continuous, on-change: maximum sampling period allowed in microseconds.
+ * one-shot, special : 0
+ * 2) maxDelay should always fit within a 32 bit signed integer. It is declared as 64 bit
+ * on 64 bit architectures only for binary compatibility reasons.
+ * Availability: SENSORS_DEVICE_API_VERSION_1_3
+ */
+max_delay_t sensor_get_max_delay (int s)
+{
+ char avail_sysfs_path[PATH_MAX];
+ int dev_num = sensor_info[s].dev_num;
+ char freqs_buf[100];
+ char* cursor;
+ float min_supported_rate = 1000;
+ float sr;
+
+ /* continuous, on-change: maximum sampling period allowed in microseconds.
+ * one-shot, special : 0
+ */
+ if (REPORTING_MODE(sensor_desc[s].flags) == SENSOR_FLAG_ONE_SHOT_MODE ||
+ REPORTING_MODE(sensor_desc[s].flags) == SENSOR_FLAG_SPECIAL_REPORTING_MODE)
+ return 0;
+
+ sprintf(avail_sysfs_path, DEVICE_AVAIL_FREQ_PATH, dev_num);
+
+ if (sysfs_read_str(avail_sysfs_path, freqs_buf, sizeof(freqs_buf)) < 0) {
+ /* If poll mode sensor */
+ if (!sensor_info[s].num_channels) {
+ /* The must rate */
+ min_supported_rate = get_cdd_freq(s, 1);
+ }
+ } else {
+ cursor = freqs_buf;
+ while (*cursor && cursor[0]) {
+
+ /* Decode a single value */
+ sr = strtod(cursor, NULL);
+
+ if (sr < min_supported_rate)
+ min_supported_rate = sr;
+
+ /* Skip digits */
+ while (cursor[0] && !isspace(cursor[0]))
+ cursor++;
+
+ /* Skip spaces */
+ while (cursor[0] && isspace(cursor[0]))
+ cursor++;
+ }
+ }
+
+ /* return 0 for wrong values */
+ if (min_supported_rate < 0.1)
+ return 0;
+
+ /* Return microseconds */
+ return (max_delay_t)(1000000.0 / min_supported_rate);
+}
+
+/* this value depends on the reporting mode:
+ *
+ * continuous: minimum sample period allowed in microseconds
+ * on-change : 0
+ * one-shot :-1
+ * special : 0, unless otherwise noted
+ */
+int32_t sensor_get_min_delay(int s)
+{
+ char avail_sysfs_path[PATH_MAX];
+ int dev_num = sensor_info[s].dev_num;
+ char freqs_buf[100];
+ char* cursor;
+ float max_supported_rate = 0;
+ float sr;
+
+ /* continuous: minimum sampling period allowed in microseconds.
+ * on-change, special : 0
+ * one-shot :-1
+ */
+ if (REPORTING_MODE(sensor_desc[s].flags) == SENSOR_FLAG_ON_CHANGE_MODE ||
+ REPORTING_MODE(sensor_desc[s].flags) == SENSOR_FLAG_SPECIAL_REPORTING_MODE)
+ return 0;
+
+ if (REPORTING_MODE(sensor_desc[s].flags) == SENSOR_FLAG_ONE_SHOT_MODE)
+ return -1;
+
+ sprintf(avail_sysfs_path, DEVICE_AVAIL_FREQ_PATH, dev_num);
+
+ if (sysfs_read_str(avail_sysfs_path, freqs_buf, sizeof(freqs_buf)) < 0) {
+ /* If poll mode sensor */
+ if (!sensor_info[s].num_channels) {
+ /* The should rate */
+ max_supported_rate = get_cdd_freq(s, 0);
+ }
+ } else {
+ cursor = freqs_buf;
+ while (*cursor && cursor[0]) {
+
+ /* Decode a single value */
+ sr = strtod(cursor, NULL);
+
+ if (sr > max_supported_rate && sr <= MAX_EVENTS)
+ max_supported_rate = sr;
+
+ /* Skip digits */
+ while (cursor[0] && !isspace(cursor[0]))
+ cursor++;
+
+ /* Skip spaces */
+ while (cursor[0] && isspace(cursor[0]))
+ cursor++;
+ }
+ }
+
+ /* return 0 for wrong values */
+ if (max_supported_rate < 0.1)
+ return 0;
+
+ /* Return microseconds */
+ return (int32_t)(1000000.0 / max_supported_rate);
+}
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