244477333a
There is no reason to keep both separated. We want to avoid API specific tools and instead keep generic terms like 'input'.
268 lines
11 KiB
C
268 lines
11 KiB
C
/*
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* expose input properties via udev
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*
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* Copyright (C) 2009 Martin Pitt <martin.pitt@ubuntu.com>
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* Portions Copyright (C) 2004 David Zeuthen, <david@fubar.dk>
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* Copyright (C) 2011 Kay Sievers <kay@vrfy.org>
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* Copyright (C) 2014 Carlos Garnacho <carlosg@gnome.org>
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* Copyright (C) 2014 David Herrmann <dh.herrmann@gmail.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
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <linux/limits.h>
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#include <linux/input.h>
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#include "udev.h"
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#include "util.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 inline int abs_size_mm(const struct input_absinfo *absinfo) {
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/* Resolution is defined to be in units/mm for ABS_X/Y */
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return (absinfo->maximum - absinfo->minimum) / absinfo->resolution;
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}
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static void extract_info(struct udev_device *dev, const char *devpath, bool test) {
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char width[DECIMAL_STR_MAX(int)], height[DECIMAL_STR_MAX(int)];
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struct input_absinfo xabsinfo = {}, yabsinfo = {};
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_cleanup_close_ int fd = -1;
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fd = open(devpath, O_RDONLY|O_CLOEXEC);
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if (fd < 0)
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return;
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if (ioctl(fd, EVIOCGABS(ABS_X), &xabsinfo) < 0 ||
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ioctl(fd, EVIOCGABS(ABS_Y), &yabsinfo) < 0)
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return;
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if (xabsinfo.resolution <= 0 || yabsinfo.resolution <= 0)
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return;
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snprintf(width, sizeof(width), "%d", abs_size_mm(&xabsinfo));
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snprintf(height, sizeof(height), "%d", abs_size_mm(&yabsinfo));
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udev_builtin_add_property(dev, test, "ID_INPUT_WIDTH_MM", width);
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udev_builtin_add_property(dev, test, "ID_INPUT_HEIGHT_MM", height);
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}
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/*
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* Read a capability attribute and return bitmask.
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* @param dev udev_device
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* @param attr sysfs attribute name (e. g. "capabilities/key")
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* @param bitmask: Output array which has a sizeof of bitmask_size
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*/
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static void get_cap_mask(struct udev_device *dev,
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struct udev_device *pdev, const char* attr,
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unsigned long *bitmask, size_t bitmask_size,
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bool test) {
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const char *v;
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char text[4096];
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unsigned i;
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char* word;
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unsigned long val;
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v = udev_device_get_sysattr_value(pdev, attr);
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if (!v)
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v = "";
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snprintf(text, sizeof(text), "%s", v);
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log_debug("%s raw kernel attribute: %s", attr, text);
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memzero(bitmask, bitmask_size);
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i = 0;
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while ((word = strrchr(text, ' ')) != NULL) {
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val = strtoul (word+1, NULL, 16);
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if (i < bitmask_size/sizeof(unsigned long))
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bitmask[i] = val;
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else
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log_debug("ignoring %s block %lX which is larger than maximum size", attr, val);
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*word = '\0';
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++i;
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}
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val = strtoul (text, NULL, 16);
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if (i < bitmask_size / sizeof(unsigned long))
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bitmask[i] = val;
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else
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log_debug("ignoring %s block %lX which is larger than maximum size", attr, val);
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if (test) {
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/* printf pattern with the right unsigned long number of hex chars */
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snprintf(text, sizeof(text), " bit %%4u: %%0%zilX\n", 2 * sizeof(unsigned long));
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log_debug("%s decoded bit map:", attr);
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val = bitmask_size / sizeof (unsigned long);
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/* skip over leading zeros */
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while (bitmask[val-1] == 0 && val > 0)
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--val;
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for (i = 0; i < val; ++i) {
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DISABLE_WARNING_FORMAT_NONLITERAL;
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log_debug(text, i * BITS_PER_LONG, bitmask[i]);
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REENABLE_WARNING;
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}
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}
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}
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/* pointer devices */
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static void test_pointers (struct udev_device *dev,
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const unsigned long* bitmask_ev,
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const unsigned long* bitmask_abs,
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const unsigned long* bitmask_key,
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const unsigned long* bitmask_rel,
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bool test) {
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int is_mouse = 0;
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int is_touchpad = 0;
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if (!test_bit (EV_KEY, bitmask_ev)) {
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if (test_bit (EV_ABS, bitmask_ev) &&
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test_bit (ABS_X, bitmask_abs) &&
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test_bit (ABS_Y, bitmask_abs) &&
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test_bit (ABS_Z, bitmask_abs))
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udev_builtin_add_property(dev, test, "ID_INPUT_ACCELEROMETER", "1");
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return;
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}
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if (test_bit (EV_ABS, bitmask_ev) &&
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test_bit (ABS_X, bitmask_abs) && test_bit (ABS_Y, bitmask_abs)) {
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if (test_bit (BTN_STYLUS, bitmask_key) || test_bit (BTN_TOOL_PEN, bitmask_key))
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udev_builtin_add_property(dev, test, "ID_INPUT_TABLET", "1");
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else if (test_bit (BTN_TOOL_FINGER, bitmask_key) && !test_bit (BTN_TOOL_PEN, bitmask_key))
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is_touchpad = 1;
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else if (test_bit (BTN_MOUSE, bitmask_key))
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/* This path is taken by VMware's USB mouse, which has
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* absolute axes, but no touch/pressure button. */
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is_mouse = 1;
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else if (test_bit (BTN_TOUCH, bitmask_key))
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udev_builtin_add_property(dev, test, "ID_INPUT_TOUCHSCREEN", "1");
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/* joysticks don't necessarily have to have buttons; e. g.
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* rudders/pedals are joystick-like, but buttonless; they have
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* other fancy axes */
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else if (test_bit (BTN_TRIGGER, bitmask_key) ||
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test_bit (BTN_A, bitmask_key) ||
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test_bit (BTN_1, bitmask_key) ||
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test_bit (ABS_RX, bitmask_abs) ||
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test_bit (ABS_RY, bitmask_abs) ||
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test_bit (ABS_RZ, bitmask_abs) ||
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test_bit (ABS_THROTTLE, bitmask_abs) ||
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test_bit (ABS_RUDDER, bitmask_abs) ||
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test_bit (ABS_WHEEL, bitmask_abs) ||
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test_bit (ABS_GAS, bitmask_abs) ||
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test_bit (ABS_BRAKE, bitmask_abs))
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udev_builtin_add_property(dev, test, "ID_INPUT_JOYSTICK", "1");
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}
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if (test_bit (EV_REL, bitmask_ev) &&
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test_bit (REL_X, bitmask_rel) && test_bit (REL_Y, bitmask_rel) &&
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test_bit (BTN_MOUSE, bitmask_key))
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is_mouse = 1;
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if (is_mouse)
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udev_builtin_add_property(dev, test, "ID_INPUT_MOUSE", "1");
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if (is_touchpad)
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udev_builtin_add_property(dev, test, "ID_INPUT_TOUCHPAD", "1");
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}
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/* key like devices */
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static void test_key (struct udev_device *dev,
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const unsigned long* bitmask_ev,
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const unsigned long* bitmask_key,
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bool test) {
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unsigned i;
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unsigned long found;
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unsigned long mask;
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/* do we have any KEY_* capability? */
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if (!test_bit (EV_KEY, bitmask_ev)) {
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log_debug("test_key: no EV_KEY capability");
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return;
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}
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/* only consider KEY_* here, not BTN_* */
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found = 0;
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for (i = 0; i < BTN_MISC/BITS_PER_LONG; ++i) {
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found |= bitmask_key[i];
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log_debug("test_key: checking bit block %lu for any keys; found=%i", (unsigned long)i*BITS_PER_LONG, found > 0);
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}
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/* If there are no keys in the lower block, check the higher block */
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if (!found) {
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for (i = KEY_OK; i < BTN_TRIGGER_HAPPY; ++i) {
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if (test_bit (i, bitmask_key)) {
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log_debug("test_key: Found key %x in high block", i);
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found = 1;
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break;
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}
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}
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}
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if (found > 0)
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udev_builtin_add_property(dev, test, "ID_INPUT_KEY", "1");
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/* the first 32 bits are ESC, numbers, and Q to D; if we have all of
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* those, consider it a full keyboard; do not test KEY_RESERVED, though */
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mask = 0xFFFFFFFE;
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if ((bitmask_key[0] & mask) == mask)
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udev_builtin_add_property(dev, test, "ID_INPUT_KEYBOARD", "1");
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}
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static int builtin_input_id(struct udev_device *dev, int argc, char *argv[], bool test) {
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struct udev_device *pdev;
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unsigned long bitmask_ev[NBITS(EV_MAX)];
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unsigned long bitmask_abs[NBITS(ABS_MAX)];
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unsigned long bitmask_key[NBITS(KEY_MAX)];
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unsigned long bitmask_rel[NBITS(REL_MAX)];
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const char *sysname, *devnode;
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/* walk up the parental chain until we find the real input device; the
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* argument is very likely a subdevice of this, like eventN */
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pdev = dev;
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while (pdev != NULL && udev_device_get_sysattr_value(pdev, "capabilities/ev") == NULL)
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pdev = udev_device_get_parent_with_subsystem_devtype(pdev, "input", NULL);
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if (pdev) {
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/* Use this as a flag that input devices were detected, so that this
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* program doesn't need to be called more than once per device */
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udev_builtin_add_property(dev, test, "ID_INPUT", "1");
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get_cap_mask(dev, pdev, "capabilities/ev", bitmask_ev, sizeof(bitmask_ev), test);
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get_cap_mask(dev, pdev, "capabilities/abs", bitmask_abs, sizeof(bitmask_abs), test);
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get_cap_mask(dev, pdev, "capabilities/rel", bitmask_rel, sizeof(bitmask_rel), test);
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get_cap_mask(dev, pdev, "capabilities/key", bitmask_key, sizeof(bitmask_key), test);
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test_pointers(dev, bitmask_ev, bitmask_abs, bitmask_key, bitmask_rel, test);
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test_key(dev, bitmask_ev, bitmask_key, test);
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}
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devnode = udev_device_get_devnode(dev);
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sysname = udev_device_get_sysname(dev);
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if (devnode && sysname && startswith(sysname, "event"))
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extract_info(dev, devnode, test);
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return EXIT_SUCCESS;
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}
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const struct udev_builtin udev_builtin_input_id = {
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.name = "input_id",
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.cmd = builtin_input_id,
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.help = "Input device properties",
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};
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