accelerometer: add orientation property

4 files changed, 350 insertions, 1 deletions

diff --git a/extras/accelerometer/.gitignore b/extras/accelerometer/.gitignore
new file mode 100644
index 0000000000..dddc2204d4
--- /dev/null
+++ b/extras/accelerometer/.gitignore
@@ -0,0 +1 @@
+accelerometer
diff --git a/extras/accelerometer/61-accelerometer.rules b/extras/accelerometer/61-accelerometer.rules
new file mode 100644
index 0000000000..a6a2bfd088
--- /dev/null
+++ b/extras/accelerometer/61-accelerometer.rules
@@ -0,0 +1,3 @@
+# do not edit this file, it will be overwritten on update
+
+SUBSYSTEM=="input", ACTION!="remove", ENV{ID_INPUT_ACCELEROMETER}=="1", IMPORT{program}="accelerometer %p"
diff --git a/extras/accelerometer/accelerometer.c b/extras/accelerometer/accelerometer.c
new file mode 100644
index 0000000000..e06bf190e5
--- /dev/null
+++ b/extras/accelerometer/accelerometer.c
@@ -0,0 +1,339 @@
+/*
+ * accelerometer - exports device orientation through property
+ *
+ * Copyright (C) 2011 Red Hat, Inc.
+ * Author: Bastien Nocera <hadess@hadess.net>
+ *
+ * orientation_calc() from the sensorfw package:
+ * Copyright (C) 2009-2010 Nokia Corporation
+ * Authors:
+ *   Üstün Ergenoglu <ext-ustun.ergenoglu@nokia.com>
+ *   Timo Rongas <ext-timo.2.rongas@nokia.com>
+ *   Lihan Guo <lihan.guo@digia.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with keymap; if not, write to the Free Software Foundation,
+ * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <math.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <getopt.h>
+#include <limits.h>
+#include <linux/limits.h>
+#include <linux/input.h>
+
+#include "libudev.h"
+#include "libudev-private.h"
+
+/* we must use this kernel-compatible implementation */
+#define BITS_PER_LONG (sizeof(unsigned long) * 8)
+#define NBITS(x) ((((x)-1)/BITS_PER_LONG)+1)
+#define OFF(x)  ((x)%BITS_PER_LONG)
+#define BIT(x)  (1UL<<OFF(x))
+#define LONG(x) ((x)/BITS_PER_LONG)
+#define test_bit(bit, array)    ((array[LONG(bit)] >> OFF(bit)) & 1)
+
+static int debug = 0;
+
+static void log_fn(struct udev *udev, int priority,
+		   const char *file, int line, const char *fn,
+		   const char *format, va_list args)
+{
+	if (debug) {
+		fprintf(stderr, "%s: ", fn);
+		vfprintf(stderr, format, args);
+	} else {
+		vsyslog(priority, format, args);
+	}
+}
+
+typedef enum {
+	ORIENTATION_UNDEFINED,
+	ORIENTATION_NORMAL,
+	ORIENTATION_BOTTOM_UP,
+	ORIENTATION_LEFT_UP,
+	ORIENTATION_RIGHT_UP
+} OrientationUp;
+
+static const char *orientations[] = {
+	"undefined",
+	"normal",
+	"bottom-up",
+	"left-up",
+	"right-up",
+	NULL
+};
+
+#define ORIENTATION_UP_UP ORIENTATION_NORMAL
+
+#define DEFAULT_THRESHOLD 250
+#define RADIANS_TO_DEGREES 180.0/M_PI
+#define SAME_AXIS_LIMIT 5
+
+#define THRESHOLD_LANDSCAPE  25
+#define THRESHOLD_PORTRAIT  20
+
+static const char *
+orientation_to_string (OrientationUp o)
+{
+	return orientations[o];
+}
+
+static OrientationUp
+string_to_orientation (const char *orientation)
+{
+	int i;
+
+	if (orientation == NULL)
+		return ORIENTATION_UNDEFINED;
+	for (i = 0; orientations[i] != NULL; i++) {
+		if (strcmp (orientation, orientations[i]) == 0)
+			return i;
+	}
+	return ORIENTATION_UNDEFINED;
+}
+
+static OrientationUp
+orientation_calc (OrientationUp prev,
+		  int x, int y, int z)
+{
+	int rotation;
+	OrientationUp ret = prev;
+
+	/* Portrait check */
+	rotation = round(atan((double) x / sqrt(y * y + z * z)) * RADIANS_TO_DEGREES);
+
+	if (abs(rotation) > THRESHOLD_PORTRAIT) {
+		ret = (rotation < 0) ? ORIENTATION_LEFT_UP : ORIENTATION_RIGHT_UP;
+
+		/* Some threshold to switching between portrait modes */
+		if (prev == ORIENTATION_LEFT_UP || prev == ORIENTATION_RIGHT_UP) {
+			if (abs(rotation) < SAME_AXIS_LIMIT) {
+				ret = prev;
+			}
+		}
+
+	} else {
+		/* Landscape check */
+		rotation = round(atan((double) y / sqrt(x * x + z * z)) * RADIANS_TO_DEGREES);
+
+		if (abs(rotation) > THRESHOLD_LANDSCAPE) {
+			ret = (rotation < 0) ? ORIENTATION_BOTTOM_UP : ORIENTATION_NORMAL;
+
+			/* Some threshold to switching between landscape modes */
+			if (prev == ORIENTATION_BOTTOM_UP || prev == ORIENTATION_NORMAL) {
+				if (abs(rotation) < SAME_AXIS_LIMIT) {
+					ret = prev;
+				}
+			}
+		}
+	}
+
+	return ret;
+}
+
+static OrientationUp
+get_prev_orientation(struct udev_device *dev)
+{
+	const char *value;
+
+	value = udev_device_get_property_value(dev, "ID_INPUT_ACCELEROMETER_ORIENTATION");
+	if (value == NULL)
+		return ORIENTATION_UNDEFINED;
+	return string_to_orientation(value);
+}
+
+#define SET_AXIS(axis, code_) if (ev[i].code == code_) { if (got_##axis == 0) { axis = ev[i].value; got_##axis = 1; } }
+
+/* accelerometers */
+static void test_orientation(struct udev *udev,
+			     struct udev_device *dev,
+			     const char *devpath)
+{
+	OrientationUp old, new;
+	int fd, r;
+	struct input_event ev[64];
+	int got_syn = 0;
+	int got_x, got_y, got_z;
+	int x = 0, y = 0, z = 0;
+	char text[64];
+
+	old = get_prev_orientation(dev);
+
+	if ((fd = open(devpath, O_RDONLY)) < 0)
+		return;
+
+	got_x = got_y = got_z = 0;
+
+	while (1) {
+		int i;
+
+		r = read(fd, ev, sizeof(struct input_event) * 64);
+
+		if (r < (int) sizeof(struct input_event))
+			return;
+
+		for (i = 0; i < r / (int) sizeof(struct input_event); i++) {
+			if (got_syn == 1) {
+				if (ev[i].type == EV_ABS) {
+					SET_AXIS(x, ABS_X);
+					SET_AXIS(y, ABS_Y);
+					SET_AXIS(z, ABS_Z);
+				}
+			}
+			if (ev[i].type == EV_SYN && ev[i].code == SYN_REPORT) {
+				got_syn = 1;
+			}
+			if (got_x && got_y && got_z)
+				goto read_dev;
+		}
+	}
+
+read_dev:
+	close(fd);
+
+	if (!got_x || !got_y || !got_z)
+		return;
+
+	new = orientation_calc(old, x, y, z);
+	snprintf(text, sizeof(text), "ID_INPUT_ACCELEROMETER_ORIENTATION=%s", orientation_to_string(new));
+	puts(text);
+}
+
+static void help(void)
+{
+	printf("Usage: accelerometer [options] <device path>\n"
+	       "  --debug         debug to stderr\n"
+	       "  --help          print this help text\n\n");
+}
+
+int main (int argc, char** argv)
+{
+	struct udev *udev;
+	struct udev_device *dev;
+
+	static const struct option options[] = {
+		{ "debug", no_argument, NULL, 'd' },
+		{ "help", no_argument, NULL, 'h' },
+		{}
+	};
+
+	char devpath[PATH_MAX];
+	char *devnode;
+	const char *id_path;
+	struct udev_enumerate *enumerate;
+	struct udev_list_entry *list_entry;
+
+	udev = udev_new();
+	if (udev == NULL)
+		return 1;
+
+	udev_log_init("input_id");
+	udev_set_log_fn(udev, log_fn);
+
+	/* CLI argument parsing */
+	while (1) {
+		int option;
+
+		option = getopt_long(argc, argv, "dxh", options, NULL);
+		if (option == -1)
+			break;
+
+		switch (option) {
+		case 'd':
+			debug = 1;
+			if (udev_get_log_priority(udev) < LOG_INFO)
+				udev_set_log_priority(udev, LOG_INFO);
+			break;
+		case 'h':
+			help();
+			exit(0);
+		default:
+			exit(1);
+		}
+	}
+
+	if (argv[optind] == NULL) {
+		help();
+		exit(1);
+	}
+
+	/* get the device */
+	snprintf(devpath, sizeof(devpath), "%s/%s", udev_get_sys_path(udev), argv[optind]);
+	dev = udev_device_new_from_syspath(udev, devpath);
+	if (dev == NULL) {
+		fprintf(stderr, "unable to access '%s'\n", devpath);
+		return 1;
+	}
+
+	id_path = udev_device_get_property_value(dev, "ID_PATH");
+	if (id_path == NULL) {
+		fprintf (stderr, "unable to get property ID_PATH for '%s'", devpath);
+		return 0;
+	}
+
+	/* Get the children devices and find the devnode
+	 * FIXME: use udev_enumerate_add_match_children() instead
+	 * when it's available */
+	devnode = NULL;
+	enumerate = udev_enumerate_new(udev);
+	udev_enumerate_add_match_property(enumerate, "ID_PATH", id_path);
+	udev_enumerate_add_match_subsystem(enumerate, "input");
+	udev_enumerate_scan_devices(enumerate);
+	udev_list_entry_foreach(list_entry, udev_enumerate_get_list_entry(enumerate)) {
+		struct udev_device *device;
+		const char *node;
+
+		device = udev_device_new_from_syspath(udev_enumerate_get_udev(enumerate),
+						      udev_list_entry_get_name(list_entry));
+		if (device == NULL)
+			continue;
+		/* Already found it */
+		if (devnode != NULL) {
+			udev_device_unref(device);
+			continue;
+		}
+
+		node = udev_device_get_devnode(device);
+		if (node == NULL) {
+			udev_device_unref(device);
+			continue;
+		}
+		/* Use the event sub-device */
+		if (strstr(node, "/event") == NULL) {
+			udev_device_unref(device);
+			continue;
+		}
+
+		devnode = strdup(node);
+		udev_device_unref(device);
+	}
+
+	if (devnode == NULL) {
+		fprintf(stderr, "unable to get device node for '%s'\n", devpath);
+		return 0;
+	}
+
+	info(udev, "Opening accelerometer device %s\n", devnode);
+	test_orientation(udev, dev, devnode);
+	free(devnode);
+
+	return 0;
+}
diff --git a/extras/input_id/input_id.c b/extras/input_id/input_id.c
index 5965d848da..ba53df01b0 100644
--- a/extras/input_id/input_id.c
+++ b/extras/input_id/input_id.c
@@ -109,8 +109,14 @@ static void test_pointers (const unsigned long* bitmask_ev,
 	int is_mouse = 0;
 	int is_touchpad = 0;
 
-	if (!test_bit (EV_KEY, bitmask_ev))
+	if (!test_bit (EV_KEY, bitmask_ev)) {
+		if (test_bit (EV_ABS, bitmask_ev) &&
+		    test_bit (ABS_X, bitmask_abs) &&
+		    test_bit (ABS_Y, bitmask_abs) &&
+		    test_bit (ABS_Z, bitmask_abs))
+			puts("ID_INPUT_ACCELEROMETER=1");
 		return;
+	}
 
 	if (test_bit (EV_ABS, bitmask_ev) &&
 	    test_bit (ABS_X, bitmask_abs) && test_bit (ABS_Y, bitmask_abs)) {