X-Git-Url: http://git.osdn.net/view?a=blobdiff_plain;f=description.c;h=bcfba2ee7195f424afe9e318a44b7050526396b4;hb=b24d6584ce3c44cdb5ba9ebe6aa525ff7ecd477c;hp=4d00d63af8cbcec720c244c62e22db7b5df98e0a;hpb=e83ffb3a4aff2babc81d1d6dc45379e0ce2247a3;p=android-x86%2Fhardware-intel-libsensors.git

diff --git a/description.c b/description.c
index 4d00d63..bcfba2e 100644
--- a/description.c
+++ b/description.c
@@ -6,18 +6,102 @@
 #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, "")) {
@@ -30,6 +114,18 @@ static int sensor_get_st_prop (int s, const char* sel, char val[MAX_NAME_SIZE])
 }
 
 
+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];
@@ -154,28 +250,289 @@ float sensor_get_illumincalib (int s)
 }
 
 
+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;
 
-	memset(map, 0, MAX_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++)
-		map[i] = buf[i] - '0';
-
-	/* Check that our indices are in range */
-	for (i=0; i<count; i++)
-		if (map[i] >= count) {
+		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);
+}