343 lines
10 KiB
C
343 lines
10 KiB
C
/*
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* accelerometer - exports device orientation through property
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*
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* When an "change" event is received on an accelerometer,
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* open its device node, and from the value, as well as the previous
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* value of the property, calculate the device's new orientation,
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* and export it as ID_INPUT_ACCELEROMETER_ORIENTATION.
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*
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* Possible values are:
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* undefined
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* * normal
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* * bottom-up
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* * left-up
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* * right-up
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*
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* The property will be persistent across sessions, and the new
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* orientations can be deducted from the previous one (it allows
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* for a threshold for switching between opposite ends of the
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* orientation).
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*
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* Copyright (C) 2011 Red Hat, Inc.
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* Author:
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* Bastien Nocera <hadess@hadess.net>
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*
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* orientation_calc() from the sensorfw package
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* Copyright (C) 2009-2010 Nokia Corporation
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* Authors:
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* Üstün Ergenoglu <ext-ustun.ergenoglu@nokia.com>
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* Timo Rongas <ext-timo.2.rongas@nokia.com>
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* Lihan Guo <lihan.guo@digia.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdbool.h>
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#include <math.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <getopt.h>
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#include <limits.h>
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#include <linux/limits.h>
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#include <linux/input.h>
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#include "libudev.h"
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#include "libudev-private.h"
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/* we must use this kernel-compatible implementation */
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#define BITS_PER_LONG (sizeof(unsigned long) * 8)
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#define NBITS(x) ((((x)-1)/BITS_PER_LONG)+1)
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#define OFF(x) ((x)%BITS_PER_LONG)
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#define BIT(x) (1UL<<OFF(x))
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#define LONG(x) ((x)/BITS_PER_LONG)
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#define test_bit(bit, array) ((array[LONG(bit)] >> OFF(bit)) & 1)
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static int debug = 0;
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static void log_fn(struct udev *udev, int priority,
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const char *file, int line, const char *fn,
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const char *format, va_list args)
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{
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if (debug) {
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fprintf(stderr, "%s: ", fn);
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vfprintf(stderr, format, args);
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} else {
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vsyslog(priority, format, args);
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}
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}
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typedef enum {
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ORIENTATION_UNDEFINED,
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ORIENTATION_NORMAL,
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ORIENTATION_BOTTOM_UP,
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ORIENTATION_LEFT_UP,
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ORIENTATION_RIGHT_UP
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} OrientationUp;
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static const char *orientations[] = {
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"undefined",
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"normal",
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"bottom-up",
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"left-up",
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"right-up",
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NULL
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};
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#define ORIENTATION_UP_UP ORIENTATION_NORMAL
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#define DEFAULT_THRESHOLD 250
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#define RADIANS_TO_DEGREES 180.0/M_PI
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#define SAME_AXIS_LIMIT 5
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#define THRESHOLD_LANDSCAPE 25
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#define THRESHOLD_PORTRAIT 20
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static const char *
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orientation_to_string (OrientationUp o)
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{
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return orientations[o];
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}
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static OrientationUp
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string_to_orientation (const char *orientation)
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{
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int i;
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if (orientation == NULL)
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return ORIENTATION_UNDEFINED;
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for (i = 0; orientations[i] != NULL; i++) {
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if (streq (orientation, orientations[i]))
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return i;
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}
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return ORIENTATION_UNDEFINED;
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}
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static OrientationUp
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orientation_calc (OrientationUp prev,
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int x, int y, int z)
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{
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int rotation;
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OrientationUp ret = prev;
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/* Portrait check */
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rotation = round(atan((double) x / sqrt(y * y + z * z)) * RADIANS_TO_DEGREES);
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if (abs(rotation) > THRESHOLD_PORTRAIT) {
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ret = (rotation < 0) ? ORIENTATION_LEFT_UP : ORIENTATION_RIGHT_UP;
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/* Some threshold to switching between portrait modes */
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if (prev == ORIENTATION_LEFT_UP || prev == ORIENTATION_RIGHT_UP) {
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if (abs(rotation) < SAME_AXIS_LIMIT) {
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ret = prev;
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}
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}
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} else {
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/* Landscape check */
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rotation = round(atan((double) y / sqrt(x * x + z * z)) * RADIANS_TO_DEGREES);
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if (abs(rotation) > THRESHOLD_LANDSCAPE) {
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ret = (rotation < 0) ? ORIENTATION_BOTTOM_UP : ORIENTATION_NORMAL;
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/* Some threshold to switching between landscape modes */
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if (prev == ORIENTATION_BOTTOM_UP || prev == ORIENTATION_NORMAL) {
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if (abs(rotation) < SAME_AXIS_LIMIT) {
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ret = prev;
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}
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}
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}
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}
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return ret;
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}
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static OrientationUp
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get_prev_orientation(struct udev_device *dev)
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{
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const char *value;
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value = udev_device_get_property_value(dev, "ID_INPUT_ACCELEROMETER_ORIENTATION");
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if (value == NULL)
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return ORIENTATION_UNDEFINED;
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return string_to_orientation(value);
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}
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#define SET_AXIS(axis, code_) if (ev[i].code == code_) { if (got_##axis == 0) { axis = ev[i].value; got_##axis = true; } }
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/* accelerometers */
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static void test_orientation(struct udev *udev,
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struct udev_device *dev,
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const char *devpath)
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{
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OrientationUp old, new;
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_cleanup_close_ int fd = -1;
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struct input_event ev[64];
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bool got_syn = false;
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bool got_x = false, got_y = false, got_z = false;
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int x = 0, y = 0, z = 0;
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char text[64];
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old = get_prev_orientation(dev);
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fd = open(devpath, O_RDONLY);
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if (fd < 0)
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return;
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while (1) {
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int i, r;
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r = read(fd, ev, sizeof(struct input_event) * 64);
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if (r < (int) sizeof(struct input_event))
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return;
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for (i = 0; i < r / (int) sizeof(struct input_event); i++) {
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if (got_syn) {
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if (ev[i].type == EV_ABS) {
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SET_AXIS(x, ABS_X);
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SET_AXIS(y, ABS_Y);
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SET_AXIS(z, ABS_Z);
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}
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}
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if (ev[i].type == EV_SYN && ev[i].code == SYN_REPORT)
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got_syn = true;
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if (got_x && got_y && got_z)
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goto read_dev;
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}
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}
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read_dev:
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new = orientation_calc(old, x, y, z);
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snprintf(text, sizeof(text),
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"ID_INPUT_ACCELEROMETER_ORIENTATION=%s", orientation_to_string(new));
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puts(text);
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}
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static void help(void)
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{
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printf("Usage: accelerometer [options] <device path>\n"
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" --debug debug to stderr\n"
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" --help print this help text\n\n");
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}
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int main (int argc, char** argv)
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{
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struct udev *udev;
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struct udev_device *dev;
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static const struct option options[] = {
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{ "debug", no_argument, NULL, 'd' },
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{ "help", no_argument, NULL, 'h' },
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{}
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};
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char devpath[PATH_MAX];
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char *devnode;
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struct udev_enumerate *enumerate;
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struct udev_list_entry *list_entry;
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udev = udev_new();
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if (udev == NULL)
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return 1;
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log_open();
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udev_set_log_fn(udev, log_fn);
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/* CLI argument parsing */
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while (1) {
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int option;
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option = getopt_long(argc, argv, "dxh", options, NULL);
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if (option == -1)
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break;
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switch (option) {
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case 'd':
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debug = 1;
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log_set_max_level(LOG_DEBUG);
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udev_set_log_priority(udev, LOG_DEBUG);
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break;
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case 'h':
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help();
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exit(0);
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default:
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exit(1);
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}
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}
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if (argv[optind] == NULL) {
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help();
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exit(1);
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}
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/* get the device */
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snprintf(devpath, sizeof(devpath), "/sys/%s", argv[optind]);
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dev = udev_device_new_from_syspath(udev, devpath);
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if (dev == NULL) {
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fprintf(stderr, "unable to access '%s'\n", devpath);
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return 1;
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}
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/* Get the children devices and find the devnode */
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devnode = NULL;
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enumerate = udev_enumerate_new(udev);
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udev_enumerate_add_match_parent(enumerate, dev);
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udev_enumerate_scan_devices(enumerate);
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udev_list_entry_foreach(list_entry, udev_enumerate_get_list_entry(enumerate)) {
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struct udev_device *device;
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const char *node;
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device = udev_device_new_from_syspath(udev_enumerate_get_udev(enumerate),
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udev_list_entry_get_name(list_entry));
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if (device == NULL)
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continue;
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/* Already found it */
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if (devnode != NULL) {
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udev_device_unref(device);
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continue;
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}
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node = udev_device_get_devnode(device);
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if (node == NULL) {
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udev_device_unref(device);
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continue;
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}
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/* Use the event sub-device */
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if (strstr(node, "/event") == NULL) {
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udev_device_unref(device);
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continue;
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}
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devnode = strdup(node);
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udev_device_unref(device);
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}
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if (devnode == NULL) {
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fprintf(stderr, "unable to get device node for '%s'\n", devpath);
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return 0;
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}
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log_debug("opening accelerometer device %s\n", devnode);
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test_orientation(udev, dev, devnode);
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free(devnode);
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log_close();
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return 0;
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}
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