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/*
* input_id - input device classification
*
* Copyright (C) 2009 Martin Pitt <martin.pitt@ubuntu.com>
* Portions Copyright (C) 2004 David Zeuthen, <david@fubar.dk>
*
* 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 <stdlib.h>
#include <limits.h>
#include <linux/input.h>
#include "libudev.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)
/*
* Read a capability attribute and return bitmask.
* @param dev udev_device
* @param attr sysfs attribute name (e. g. "capabilities/key")
* @param bitmask: Output array; must have max_size elements
*/
static void get_cap_mask (struct udev_device *dev, const char* attr,
unsigned long *bitmask, size_t max_size)
{
char text[4096];
int i;
char* word;
unsigned long val;
snprintf(text, sizeof(text), "%s", udev_device_get_sysattr_value(dev, attr));
memset (bitmask, 0, max_size);
i = 0;
while ((word = strrchr(text, ' ')) != NULL) {
val = strtoul (word+1, NULL, 16);
bitmask[i] = val;
*word = '\0';
++i;
}
val = strtoul (text, NULL, 16);
bitmask[i] = val;
}
/* pointer devices */
static void test_pointers (const unsigned long* bitmask_abs, const unsigned long* bitmask_key, const unsigned long* bitmask_rel)
{
int is_mouse = 0;
int is_touchpad = 0;
if (test_bit (ABS_X, bitmask_abs) && test_bit (ABS_Y, bitmask_abs)) {
if (test_bit (BTN_STYLUS, bitmask_key) || test_bit (BTN_TOOL_PEN, bitmask_key))
puts("ID_INPUT_TABLET=1");
else if (test_bit (BTN_TOOL_FINGER, bitmask_key) && !test_bit (BTN_TOOL_PEN, bitmask_key))
is_touchpad = 1;
else if (test_bit (BTN_TRIGGER, bitmask_key) ||
test_bit (BTN_A, bitmask_key) ||
test_bit (BTN_1, bitmask_key))
puts("ID_INPUT_JOYSTICK=1");
else if (test_bit (BTN_MOUSE, bitmask_key))
/* This path is taken by VMware's USB mouse, which has
* absolute axes, but no touch/pressure button. */
is_mouse = 1;
}
if (test_bit (REL_X, bitmask_rel) && test_bit (REL_Y, bitmask_rel))
is_mouse = 1;
if (is_mouse)
puts("ID_INPUT_MOUSE=1");
if (is_touchpad)
puts("ID_INPUT_TOUCHPAD=1");
}
/* key like devices */
static void test_key (const unsigned long* bitmask_key)
{
unsigned i;
unsigned long acc;
unsigned long mask;
/* do we have any KEY_* capability? */
acc = 0;
for (i = 0; i < BTN_MISC/BITS_PER_LONG; ++i)
acc |= bitmask_key[i];
if (acc > 0)
puts("ID_INPUT_KEY=1");
/* the first 32 bits are ESC, numbers, and Q to D; if we have all of
* those, consider it a full keyboard; do not test KEY_RESERVED, though */
mask = 0xFFFFFFFE;
if ((bitmask_key[0] & mask) == mask)
puts("ID_INPUT_KEYBOARD=1");
}
int main (int argc, char** argv)
{
struct udev *udev;
struct udev_device *dev;
char devpath[PATH_MAX];
unsigned long bitmask_abs[NBITS(ABS_MAX)];
unsigned long bitmask_key[NBITS(KEY_MAX)];
unsigned long bitmask_rel[NBITS(REL_MAX)];
if (argc != 2) {
fprintf(stderr, "Usage: %s <device path (without /sys)>\n", argv[0]);
exit(1);
}
/* get the device */
udev = udev_new();
if (udev == NULL)
return 1;
snprintf(devpath, sizeof(devpath), "%s/%s", udev_get_sys_path(udev), argv[1]);
dev = udev_device_new_from_syspath(udev, devpath);
if (dev == NULL) {
fprintf(stderr, "unable to access '%s'\n", devpath);
return 1;
}
/* walk up the parental chain until we find the real input device; the
* argument is very likely a subdevice of this, like eventN */
while (dev != NULL && udev_device_get_sysattr_value(dev, "capabilities/key") == NULL)
dev = udev_device_get_parent_with_subsystem_devtype(dev, "input", NULL);
/* not an "input" class device */
if (dev == NULL)
return 0;
/* Use this as a flag that input devices were detected, so that this
* program doesn't need to be called more than once per device */
puts("ID_INPUT=1");
get_cap_mask (dev, "capabilities/abs", bitmask_abs, sizeof (bitmask_abs));
get_cap_mask (dev, "capabilities/rel", bitmask_rel, sizeof (bitmask_rel));
get_cap_mask (dev, "capabilities/key", bitmask_key, sizeof (bitmask_key));
test_pointers(bitmask_abs, bitmask_key, bitmask_rel);
test_key(bitmask_key);
return 0;
}
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