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enumeration.c
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/*
// Copyright (c) 2015 Intel Corporation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
*/
#include <ctype.h>
#include <dirent.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <utils/Log.h>
#include <sys/stat.h>
#include <hardware/sensors.h>
#include "enumeration.h"
#include "description.h"
#include "utils.h"
#include "transform.h"
#include "description.h"
#include "control.h"
#include "calibration.h"
#include <errno.h>
/*
* This table maps syfs entries in scan_elements directories to sensor types,
* and will also be used to determine other sysfs names as well as the iio
* device number associated to a specific sensor.
*/
/*
* We duplicate entries for the uncalibrated types after their respective base
* sensor. This is because all sensor entries must have an associated catalog entry
* and also because when only the uncal sensor is active it needs to take it's data
* from the same iio device as the base one.
*/
sensor_catalog_entry_t sensor_catalog[] = {
{
.tag = "accel",
.shorthand = "",
.type = SENSOR_TYPE_ACCELEROMETER,
.num_channels = 3,
.is_virtual = 0,
.channel = {
{ DECLARE_NAMED_CHANNEL("accel", "x") },
{ DECLARE_NAMED_CHANNEL("accel", "y") },
{ DECLARE_NAMED_CHANNEL("accel", "z") },
},
},
{
.tag = "anglvel",
.shorthand = "",
.type = SENSOR_TYPE_GYROSCOPE,
.num_channels = 3,
.is_virtual = 0,
.channel = {
{ DECLARE_NAMED_CHANNEL("anglvel", "x") },
{ DECLARE_NAMED_CHANNEL("anglvel", "y") },
{ DECLARE_NAMED_CHANNEL("anglvel", "z") },
},
},
{
.tag = "magn",
.shorthand = "",
.type = SENSOR_TYPE_MAGNETIC_FIELD,
.num_channels = 3,
.is_virtual = 0,
.channel = {
{ DECLARE_NAMED_CHANNEL("magn", "x") },
{ DECLARE_NAMED_CHANNEL("magn", "y") },
{ DECLARE_NAMED_CHANNEL("magn", "z") },
},
},
{
.tag = "intensity",
.shorthand = "",
.type = SENSOR_TYPE_INTERNAL_INTENSITY,
.num_channels = 1,
.is_virtual = 0,
.channel = {
{ DECLARE_NAMED_CHANNEL("intensity", "both") },
},
},
{
.tag = "illuminance",
.shorthand = "",
.type = SENSOR_TYPE_INTERNAL_ILLUMINANCE,
.num_channels = 1,
.is_virtual = 0,
.channel = {
{ DECLARE_GENERIC_CHANNEL("illuminance") },
},
},
{
.tag = "illuminance",
.shorthand = "",
.type = SENSOR_TYPE_INTERNAL_ILLUMINANCE,
.num_channels = 1,
.is_virtual = 0,
.channel = {
{ DECLARE_GENERIC_CHANNEL("illuminance0") },
},
},
{
.tag = "incli",
.shorthand = "",
.type = SENSOR_TYPE_ORIENTATION,
.num_channels = 3,
.is_virtual = 0,
.channel = {
{ DECLARE_NAMED_CHANNEL("incli", "x") },
{ DECLARE_NAMED_CHANNEL("incli", "y") },
{ DECLARE_NAMED_CHANNEL("incli", "z") },
},
},
{
.tag = "rot",
.shorthand = "",
.type = SENSOR_TYPE_ROTATION_VECTOR,
.num_channels = 4,
.is_virtual = 0,
.channel = {
{ DECLARE_NAMED_CHANNEL("rot", "quat_x") },
{ DECLARE_NAMED_CHANNEL("rot", "quat_y") },
{ DECLARE_NAMED_CHANNEL("rot", "quat_z") },
{ DECLARE_NAMED_CHANNEL("rot", "quat_w") },
},
},
{
.tag = "temp",
.shorthand = "",
.type = SENSOR_TYPE_AMBIENT_TEMPERATURE,
.num_channels = 1,
.is_virtual = 0,
.channel = {
{ DECLARE_GENERIC_CHANNEL("temp") },
},
},
{
.tag = "proximity",
.shorthand = "prox",
.type = SENSOR_TYPE_PROXIMITY,
.num_channels = 1,
.is_virtual = 0,
.channel = {
{ DECLARE_GENERIC_CHANNEL("proximity") },
},
},
{
.tag = "proximity",
.shorthand = "prox",
.type = SENSOR_TYPE_PROXIMITY,
.num_channels = 1,
.is_virtual = 0,
.channel = {
{ DECLARE_GENERIC_CHANNEL("proximity0") },
},
},
{
.tag = "",
.shorthand = "",
.type = SENSOR_TYPE_GYROSCOPE_UNCALIBRATED,
.num_channels = 0,
.is_virtual = 1,
.channel = {
{ DECLARE_GENERIC_CHANNEL("") },
},
},
{
.tag = "",
.shorthand = "",
.type = SENSOR_TYPE_MAGNETIC_FIELD_UNCALIBRATED,
.num_channels = 0,
.is_virtual = 1,
.channel = {
{ DECLARE_GENERIC_CHANNEL("") },
},
},
{
.tag = "steps",
.shorthand = "",
.type = SENSOR_TYPE_STEP_COUNTER,
.num_channels = 1,
.is_virtual = 0,
.channel = {
{ DECLARE_GENERIC_CHANNEL("steps") },
},
},
{
.tag = "steps",
.shorthand = "",
.type = SENSOR_TYPE_STEP_DETECTOR,
.num_channels = 1,
.is_virtual = 0,
.channel = {
{
DECLARE_VOID_CHANNEL("steps")
.num_events = 1,
.event = {
{ DECLARE_NAMED_EVENT("steps", "change") },
},
},
},
},
{
.tag = "proximity",
.shorthand = "prox",
.type = SENSOR_TYPE_PROXIMITY,
.num_channels = 4,
.is_virtual = 0,
.channel = {
{
DECLARE_VOID_CHANNEL("proximity0")
.num_events = 1,
.event = {
{ DECLARE_EVENT("proximity0", "_", "", "", "thresh", "_", "either") },
},
},
{
DECLARE_VOID_CHANNEL("proximity1")
.num_events = 1,
.event = {
{ DECLARE_EVENT("proximity1", "_", "", "", "thresh", "_", "either") },
},
},
{
DECLARE_VOID_CHANNEL("proximity2")
.num_events = 1,
.event = {
{ DECLARE_EVENT("proximity2", "_", "", "", "thresh", "_", "either") },
},
},
{
DECLARE_VOID_CHANNEL("proximity3")
.num_events = 1,
.event = {
{ DECLARE_EVENT("proximity3", "_", "", "", "thresh", "_", "either") },
},
},
},
},
};
unsigned int catalog_size = ARRAY_SIZE(sensor_catalog);
/* ACPI PLD (physical location of device) definitions, as used with sensors */
#define PANEL_FRONT 4
#define PANEL_BACK 5
/* Buffer default length */
#define BUFFER_LENGTH 16
/* We equate sensor handles to indices in these tables */
struct sensor_t sensor_desc[MAX_SENSORS]; /* Android-level descriptors */
sensor_info_t sensor[MAX_SENSORS]; /* Internal descriptors */
int sensor_count; /* Detected sensors */
/* if the sensor has an _en attribute, we need to enable it */
int get_needs_enable(int dev_num, const char *tag)
{
char sysfs_path[PATH_MAX];
int fd;
sprintf(sysfs_path, SENSOR_ENABLE_PATH, dev_num, tag);
fd = open(sysfs_path, O_RDWR);
if (fd == -1)
return 0;
close(fd);
return 1;
}
static void setup_properties_from_pld (int s, int panel, int rotation,
int num_channels)
{
/*
* Generate suitable order and opt_scale directives from the PLD panel
* and rotation codes we got. This can later be superseded by the usual
* properties if necessary. Eventually we'll need to replace these
* mechanisms by a less convoluted one, such as a 3x3 placement matrix.
*/
int x = 1;
int y = 1;
int z = 1;
int xy_swap = 0;
int angle = rotation * 45;
/* Only deal with 3 axis chips for now */
if (num_channels < 3)
return;
if (panel == PANEL_BACK) {
/* Chip placed on the back panel ; negate x and z */
x = -x;
z = -z;
}
switch (angle) {
case 90: /* 90° clockwise: negate y then swap x,y */
xy_swap = 1;
y = -y;
break;
case 180: /* Upside down: negate x and y */
x = -x;
y = -y;
break;
case 270: /* 90° counter clockwise: negate x then swap x,y */
x = -x;
xy_swap = 1;
break;
}
if (xy_swap) {
sensor[s].order[0] = 1;
sensor[s].order[1] = 0;
sensor[s].order[2] = 2;
sensor[s].quirks |= QUIRK_FIELD_ORDERING;
}
sensor[s].channel[0].opt_scale = x;
sensor[s].channel[1].opt_scale = y;
sensor[s].channel[2].opt_scale = z;
}
static int is_valid_pld (int panel, int rotation)
{
if (panel != PANEL_FRONT && panel != PANEL_BACK) {
ALOGW("Unhandled PLD panel spec: %d\n", panel);
return 0;
}
/* Only deal with 90° rotations for now */
if (rotation < 0 || rotation > 7 || (rotation & 1)) {
ALOGW("Unhandled PLD rotation spec: %d\n", rotation);
return 0;
}
return 1;
}
static int read_pld_from_properties (int s, int* panel, int* rotation)
{
int p, r;
if (sensor_get_prop(s, "panel", &p))
return -1;
if (sensor_get_prop(s, "rotation", &r))
return -1;
if (!is_valid_pld(p, r))
return -1;
*panel = p;
*rotation = r;
ALOGI("S%d PLD from properties: panel=%d, rotation=%d\n", s, p, r);
return 0;
}
static int read_pld_from_sysfs (int s, int dev_num, int* panel, int* rotation)
{
char sysfs_path[PATH_MAX];
int p,r;
sprintf(sysfs_path, BASE_PATH "../firmware_node/pld/panel", dev_num);
if (sysfs_read_int(sysfs_path, &p))
return -1;
sprintf(sysfs_path, BASE_PATH "../firmware_node/pld/rotation", dev_num);
if (sysfs_read_int(sysfs_path, &r))
return -1;
if (!is_valid_pld(p, r))
return -1;
*panel = p;
*rotation = r;
ALOGI("S%d PLD from sysfs: panel=%d, rotation=%d\n", s, p, r);
return 0;
}
static void decode_placement_information (int dev_num, int num_channels, int s)
{
/*
* See if we have optional "physical location of device" ACPI tags.
* We're only interested in panel and rotation specifiers. Use the
* .panel and .rotation properties in priority, and the actual ACPI
* values as a second source.
*/
int panel;
int rotation;
if (read_pld_from_properties(s, &panel, &rotation) &&
read_pld_from_sysfs(s, dev_num, &panel, &rotation))
return; /* No PLD data available */
/* Map that to field ordering and scaling mechanisms */
setup_properties_from_pld(s, panel, rotation, num_channels);
}
static int map_internal_to_external_type (int sensor_type)
{
/* Most sensors are internally identified using the Android type, but for some we use a different type specification internally */
switch (sensor_type) {
case SENSOR_TYPE_INTERNAL_ILLUMINANCE:
case SENSOR_TYPE_INTERNAL_INTENSITY:
return SENSOR_TYPE_LIGHT;
default:
return sensor_type;
}
}
static void populate_descriptors (int s, int sensor_type)
{
int32_t min_delay_us;
max_delay_t max_delay_us;
/* Initialize Android-visible descriptor */
sensor_desc[s].name = sensor_get_name(s);
sensor_desc[s].vendor = sensor_get_vendor(s);
sensor_desc[s].version = sensor_get_version(s);
sensor_desc[s].handle = s;
sensor_desc[s].type = map_internal_to_external_type(sensor_type);
sensor_desc[s].maxRange = sensor_get_max_range(s);
sensor_desc[s].resolution = sensor_get_resolution(s);
sensor_desc[s].power = sensor_get_power(s);
sensor_desc[s].stringType = sensor_get_string_type(s);
/* None of our supported sensors requires a special permission */
sensor_desc[s].requiredPermission = "";
sensor_desc[s].flags = sensor_get_flags(s);
sensor_desc[s].minDelay = sensor_get_min_delay(s);
sensor_desc[s].maxDelay = sensor_get_max_delay(s);
ALOGV("Sensor %d (%s) type(%d) minD(%d) maxD(%zd) flags(%2.2zx)\n",
s, sensor[s].friendly_name, sensor_desc[s].type,
sensor_desc[s].minDelay, sensor_desc[s].maxDelay,
sensor_desc[s].flags);
/* We currently do not implement batching */
sensor_desc[s].fifoReservedEventCount = 0;
sensor_desc[s].fifoMaxEventCount = 0;
min_delay_us = sensor_desc[s].minDelay;
max_delay_us = sensor_desc[s].maxDelay;
sensor[s].min_supported_rate = max_delay_us ? 1000000.0 / max_delay_us : 1;
sensor[s].max_supported_rate = min_delay_us && min_delay_us != -1 ? 1000000.0 / min_delay_us : 0;
}
static void add_virtual_sensor (int catalog_index)
{
int s;
int sensor_type;
if (sensor_count == MAX_SENSORS) {
ALOGE("Too many sensors!\n");
return;
}
sensor_type = sensor_catalog[catalog_index].type;
s = sensor_count;
sensor[s].is_virtual = 1;
sensor[s].catalog_index = catalog_index;
sensor[s].type = sensor_type;
populate_descriptors(s, sensor_type);
/* Initialize fields related to sysfs reads offloading */
sensor[s].thread_data_fd[0] = -1;
sensor[s].thread_data_fd[1] = -1;
sensor[s].acquisition_thread = -1;
sensor_count++;
}
static int add_sensor (int dev_num, int catalog_index, int mode)
{
int s;
int sensor_type;
int retval;
char sysfs_path[PATH_MAX];
const char* prefix;
float scale;
int c;
float opt_scale;
const char* ch_name;
int num_channels;
char suffix[MAX_NAME_SIZE + 8];
int calib_bias;
int buffer_length;
if (sensor_count == MAX_SENSORS) {
ALOGE("Too many sensors!\n");
return -1;
}
sensor_type = sensor_catalog[catalog_index].type;
/*
* At this point we could check that the expected sysfs attributes are
* present ; that would enable having multiple catalog entries with the
* same sensor type, accomodating different sets of sysfs attributes.
*/
s = sensor_count;
sensor[s].dev_num = dev_num;
sensor[s].catalog_index = catalog_index;
sensor[s].type = sensor_type;
sensor[s].mode = mode;
sensor[s].trigger_nr = -1; /* -1 means no trigger - we'll populate these at a later time */
num_channels = sensor_catalog[catalog_index].num_channels;
if (mode == MODE_POLL)
sensor[s].num_channels = 0;
else
sensor[s].num_channels = num_channels;
/* Populate the quirks array */
sensor_get_quirks(s);
/* Reject interfaces that may have been disabled through a quirk for this driver */
if ((mode == MODE_EVENT && (sensor[s].quirks & QUIRK_NO_EVENT_MODE)) ||
(mode == MODE_TRIGGER && (sensor[s].quirks & QUIRK_NO_TRIG_MODE )) ||
(mode == MODE_POLL && (sensor[s].quirks & QUIRK_NO_POLL_MODE ))) {
memset(&sensor[s], 0, sizeof(sensor[0]));
return -1;
}
prefix = sensor_catalog[catalog_index].tag;
/*
* receiving the illumination sensor calibration inputs from
* the Android properties and setting it within sysfs
*/
if (sensor_type == SENSOR_TYPE_INTERNAL_ILLUMINANCE) {
retval = sensor_get_illumincalib(s);
if (retval > 0) {
sprintf(sysfs_path, ILLUMINATION_CALIBPATH, dev_num);
sysfs_write_int(sysfs_path, retval);
}
}
/*
* See if we have optional calibration biases for each of the channels of this sensor. These would be expressed using properties like
* iio.accel.y.calib_bias = -1, or possibly something like iio.temp.calib_bias if the sensor has a single channel. This value gets stored in the
* relevant calibbias sysfs file if that file can be located and then used internally by the iio sensor driver.
*/
if (num_channels) {
for (c = 0; c < num_channels; c++) {
ch_name = sensor_catalog[catalog_index].channel[c].name;
sprintf(suffix, "%s.calib_bias", ch_name);
if (!sensor_get_prop(s, suffix, &calib_bias) && calib_bias) {
sprintf(suffix, "%s_%s", prefix, sensor_catalog[catalog_index].channel[c].name);
sprintf(sysfs_path, SENSOR_CALIB_BIAS_PATH, dev_num, suffix);
sysfs_write_int(sysfs_path, calib_bias);
}
}
} else
if (!sensor_get_prop(s, "calib_bias", &calib_bias) && calib_bias) {
sprintf(sysfs_path, SENSOR_CALIB_BIAS_PATH, dev_num, prefix);
sysfs_write_int(sysfs_path, calib_bias);
}
/* Change buffer length according to the property or use default value */
if (mode == MODE_TRIGGER) {
if (sensor_get_prop(s, "buffer_length", &buffer_length)) {
buffer_length = BUFFER_LENGTH;
}
sprintf(sysfs_path, BUFFER_LENGTH_PATH, dev_num);
if (sysfs_write_int(sysfs_path, buffer_length) <= 0) {
ALOGE("Failed to set buffer length on dev%d", dev_num);
}
}
/* Read name attribute, if available */
sprintf(sysfs_path, NAME_PATH, dev_num);
sysfs_read_str(sysfs_path, sensor[s].internal_name, MAX_NAME_SIZE);
/* See if we have general offsets and scale values for this sensor */
sprintf(sysfs_path, SENSOR_OFFSET_PATH, dev_num, prefix);
sysfs_read_float(sysfs_path, &sensor[s].offset);
sprintf(sysfs_path, SENSOR_SCALE_PATH, dev_num, prefix);
if (!sensor_get_fl_prop(s, "scale", &scale)) {
/*
* There is a chip preferred scale specified,
* so try to store it in sensor's scale file
*/
if (sysfs_write_float(sysfs_path, scale) == -1 && errno == ENOENT) {
ALOGE("Failed to store scale[%g] into %s - file is missing", scale, sysfs_path);
/* Store failed, try to store the scale into channel specific file */
for (c = 0; c < num_channels; c++)
{
sprintf(sysfs_path, BASE_PATH "%s", dev_num,
sensor_catalog[catalog_index].channel[c].scale_path);
if (sysfs_write_float(sysfs_path, scale) == -1)
ALOGE("Failed to store scale[%g] into %s", scale, sysfs_path);
}
}
}
sprintf(sysfs_path, SENSOR_SCALE_PATH, dev_num, prefix);
if (!sysfs_read_float(sysfs_path, &scale)) {
sensor[s].scale = scale;
ALOGV("Scale path:%s scale:%g dev_num:%d\n",
sysfs_path, scale, dev_num);
} else {
sensor[s].scale = 1;
/* Read channel specific scale if any*/
for (c = 0; c < num_channels; c++)
{
sprintf(sysfs_path, BASE_PATH "%s", dev_num,
sensor_catalog[catalog_index].channel[c].scale_path);
if (!sysfs_read_float(sysfs_path, &scale)) {
sensor[s].channel[c].scale = scale;
sensor[s].scale = 0;
ALOGV( "Scale path:%s "
"channel scale:%g dev_num:%d\n",
sysfs_path, scale, dev_num);
}
}
}
/* Set default scaling - if num_channels is zero, we have one channel */
sensor[s].channel[0].opt_scale = (sensor_type == SENSOR_TYPE_ACCELEROMETER) ? -1 : 1;
for (c = 1; c < num_channels; c++)
sensor[s].channel[c].opt_scale = sensor[s].channel[0].opt_scale;
for (c = 0; c < num_channels; c++) {
/* Check the presence of the channel's input_path */
sprintf(sysfs_path, BASE_PATH "%s", dev_num,
sensor_catalog[catalog_index].channel[c].input_path);
sensor[s].channel[c].input_path_present = (access(sysfs_path, R_OK) != -1);
/* Check the presence of the channel's raw_path */
sprintf(sysfs_path, BASE_PATH "%s", dev_num,
sensor_catalog[catalog_index].channel[c].raw_path);
sensor[s].channel[c].raw_path_present = (access(sysfs_path, R_OK) != -1);
}
sensor_get_available_frequencies(s);
if (sensor_get_mounting_matrix(s, sensor[s].mounting_matrix))
sensor[s].quirks |= QUIRK_MOUNTING_MATRIX;
else
/* Read ACPI _PLD attributes for this sensor, if there are any */
decode_placement_information(dev_num, num_channels, s);
/*
* See if we have optional correction scaling factors for each of the
* channels of this sensor. These would be expressed using properties
* like iio.accel.y.opt_scale = -1. In case of a single channel we also
* support things such as iio.temp.opt_scale = -1. Note that this works
* for all types of sensors, and whatever transform is selected, on top
* of any previous conversions.
*/
if (num_channels) {
for (c = 0; c < num_channels; c++) {
ch_name = sensor_catalog[catalog_index].channel[c].name;
sprintf(suffix, "%s.opt_scale", ch_name);
if (!sensor_get_fl_prop(s, suffix, &opt_scale))
sensor[s].channel[c].opt_scale *= opt_scale;
}
} else {
if (!sensor_get_fl_prop(s, "opt_scale", &opt_scale))
sensor[s].channel[0].opt_scale = opt_scale;
}
populate_descriptors(s, sensor_type);
if (sensor[s].internal_name[0] == '\0') {
/*
* In case the kernel-mode driver doesn't expose a name for
* the iio device, use (null)-dev%d as the trigger name...
* This can be considered a kernel-mode iio driver bug.
*/
ALOGW("Using null trigger on sensor %d (dev %d)\n", s, dev_num);
strcpy(sensor[s].internal_name, "(null)");
}
sensor[s].nearlevel = sensor_get_nearlevel(s);
switch (sensor_type) {
case SENSOR_TYPE_ACCELEROMETER:
/* Only engage accelerometer bias compensation if really needed */
if (sensor_get_quirks(s) & QUIRK_BIASED)
sensor[s].cal_data = calloc(1, sizeof(accel_cal_t));
break;
case SENSOR_TYPE_GYROSCOPE:
sensor[s].cal_data = malloc(sizeof(gyro_cal_t));
break;
case SENSOR_TYPE_MAGNETIC_FIELD:
sensor[s].cal_data = malloc(sizeof(compass_cal_t));
break;
}
sensor[s].max_cal_level = sensor_get_cal_steps(s);
/* Select one of the available sensor sample processing styles */
select_transform(s);
/* Initialize fields related to sysfs reads offloading */
sensor[s].thread_data_fd[0] = -1;
sensor[s].thread_data_fd[1] = -1;
sensor[s].acquisition_thread = -1;
/* Check if we have a special ordering property on this sensor */
if (sensor_get_order(s, sensor[s].order))
sensor[s].quirks |= QUIRK_FIELD_ORDERING;
sensor[s].needs_enable = get_needs_enable(dev_num, sensor_catalog[catalog_index].tag);
sensor_count++;
return 0;
}
static void virtual_sensors_check (void)
{
int i;
int has_acc = 0;
int has_gyr = 0;
int has_mag = 0;
int has_rot = 0;
int has_ori = 0;
int gyro_cal_idx = 0;
int magn_cal_idx = 0;
unsigned int j;
for (i=0; i<sensor_count; i++)
switch (sensor[i].type) {
case SENSOR_TYPE_ACCELEROMETER:
has_acc = 1;
break;
case SENSOR_TYPE_GYROSCOPE:
has_gyr = 1;
gyro_cal_idx = i;
break;
case SENSOR_TYPE_MAGNETIC_FIELD:
has_mag = 1;
magn_cal_idx = i;
break;
case SENSOR_TYPE_ORIENTATION:
has_ori = 1;
break;
case SENSOR_TYPE_ROTATION_VECTOR:
has_rot = 1;
break;
}
for (j=0; j<catalog_size; j++)
switch (sensor_catalog[j].type) {
/*
* If we have accel + gyro + magn but no rotation vector sensor,
* SensorService replaces the HAL provided orientation sensor by the
* AOSP version... provided we report one. So initialize a virtual
* orientation sensor with zero values, which will get replaced. See:
* frameworks/native/services/sensorservice/SensorService.cpp, looking
* for SENSOR_TYPE_ROTATION_VECTOR; that code should presumably fall
* back to mUserSensorList.add instead of replaceAt, but accommodate it.
*/
case SENSOR_TYPE_ORIENTATION:
if (has_acc && has_gyr && has_mag && !has_rot && !has_ori)
add_sensor(0, j, MODE_POLL);
break;
case SENSOR_TYPE_GYROSCOPE_UNCALIBRATED:
if (has_gyr) {
sensor[sensor_count].base_count = 1;
sensor[sensor_count].base[0] = gyro_cal_idx;
add_virtual_sensor(j);
}
break;
case SENSOR_TYPE_MAGNETIC_FIELD_UNCALIBRATED:
if (has_mag) {
sensor[sensor_count].base_count = 1;
sensor[sensor_count].base[0] = magn_cal_idx;
add_virtual_sensor(j);
}
break;
default:
break;
}
}
static void propose_new_trigger (int s, char trigger_name[MAX_NAME_SIZE],
int sensor_name_len)
{
/*
* A new trigger has been enumerated for this sensor. Check if it makes sense to use it over the currently selected one,
* and select it if it is so. The format is something like sensor_name-dev0.
*/
const char *suffix = trigger_name + sensor_name_len + 1;
/* dev is the default, and lowest priority; no need to update */
if (!memcmp(suffix, "dev", 3))
return;
/* If we found any-motion trigger, record it */
if (!memcmp(suffix, "any-motion-", 11)) {
strcpy(sensor[s].motion_trigger_name, trigger_name);
return;
}
/* If we found a hrtimer trigger, record it */
if (!memcmp(suffix, "hr-dev", 6)) {
strcpy(sensor[s].hrtimer_trigger_name, trigger_name);
return;
}
/*
* It's neither the default "dev" nor an "any-motion" one. Make sure we use this though, as we may not have any other indication of the name
* of the trigger to use with this sensor.
*/
strcpy(sensor[s].init_trigger_name, trigger_name);
}
static void update_sensor_matching_trigger_name (char name[MAX_NAME_SIZE], int* updated, int trigger)
{
/*
* Check if we have a sensor matching the specified trigger name, which should then begin with the sensor name, and end with a number
* equal to the iio device number the sensor is associated to. If so, update the string we're going to write to trigger/current_trigger
* when enabling this sensor.
*/
int s;
int dev_num;
int len;
char* cursor;
int sensor_name_len;
/*
* First determine the iio device number this trigger refers to. We expect the last few characters (typically one) of the trigger name
* to be this number, so perform a few checks.
*/
len = strnlen(name, MAX_NAME_SIZE);
if (len < 2)
return;
cursor = name + len - 1;
if (!isdigit(*cursor))
return;
while (len && isdigit(*cursor)) {
len--;
cursor--;
}
dev_num = atoi(cursor+1);
/* See if that matches a sensor */
for (s=0; s<sensor_count; s++)
if (sensor[s].dev_num == dev_num) {
sensor_name_len = strlen(sensor[s].internal_name);
if (!strncmp(name, sensor[s].internal_name, sensor_name_len))
/* Switch to new trigger if appropriate */
propose_new_trigger(s, name, sensor_name_len);
updated[s] = 1;
sensor[s].trigger_nr = trigger;
}
}
extern float sensor_get_max_static_freq(int s);
extern float sensor_get_min_freq (int s);
static int create_hrtimer_trigger(int s, int trigger)
{
struct stat dir_status;
char buf[MAX_NAME_SIZE];
char hrtimer_path[PATH_MAX];
char hrtimer_name[MAX_NAME_SIZE];
float min_supported_rate = 1, min_rate_cap, max_supported_rate;
snprintf(buf, MAX_NAME_SIZE, "hrtimer-%s-hr-dev%d", sensor[s].internal_name, sensor[s].dev_num);
snprintf(hrtimer_name, MAX_NAME_SIZE, "%s-hr-dev%d", sensor[s].internal_name, sensor[s].dev_num);
snprintf(hrtimer_path, PATH_MAX, "%s%s", CONFIGFS_TRIGGER_PATH, buf);
/* Get parent dir status */
if (stat(CONFIGFS_TRIGGER_PATH, &dir_status))
return -1;
/* Create hrtimer with the same access rights as it's parent */
if (mkdir(hrtimer_path, dir_status.st_mode))
if (errno != EEXIST)
return -1;
strncpy (sensor[s].hrtimer_trigger_name, hrtimer_name, MAX_NAME_SIZE);
sensor[s].trigger_nr = trigger;
max_supported_rate = sensor_get_max_static_freq(s);
/* set 0 for wrong values */
if (max_supported_rate < 0.1) {
max_supported_rate = 0;
}
sensor[s].max_supported_rate = max_supported_rate;
sensor_desc[s].minDelay = max_supported_rate ? (int32_t) (1000000.0 / max_supported_rate) : 0;
/* Check if a minimum rate was specified for this sensor */
min_rate_cap = sensor_get_min_freq(s);
if (min_supported_rate < min_rate_cap) {
min_supported_rate = min_rate_cap;
}
sensor[s].min_supported_rate = min_supported_rate;
sensor_desc[s].maxDelay = (max_delay_t) (1000000.0 / min_supported_rate);
return 0;
}
static void setup_trigger_names (void)
{
char filename[PATH_MAX];
char buf[MAX_NAME_SIZE];
int s;
int trigger;
int ret;
int updated[MAX_SENSORS] = {0};
/* By default, use the name-dev convention that most drivers use */
for (s=0; s<sensor_count; s++)
snprintf(sensor[s].init_trigger_name, MAX_NAME_SIZE, "%s-dev%d", sensor[s].internal_name, sensor[s].dev_num);
/* Now have a look to /sys/bus/iio/devices/triggerX entries */
for (trigger=0; trigger<MAX_TRIGGERS; trigger++) {
snprintf(filename, sizeof(filename), TRIGGER_FILE_PATH, trigger);
ret = sysfs_read_str(filename, buf, sizeof(buf));
if (ret < 0)
break;
/* Record initial and any-motion triggers names */
update_sensor_matching_trigger_name(buf, updated, trigger);
}