bd1acc9f2f
input_id already (tries to) tag accelerometers as such, but this only works for absolute accelerometers. Recent kernels mark accelerometers through an input prop. Trust that prop and always tag devices with it with ID_INPUT_ACCELEROMETER. Note that detection by the prop bit works the same as the existing detection and will ensure that no other tags get set on the device.
280 lines
12 KiB
C
280 lines
12 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%zulX\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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const unsigned long* bitmask_props,
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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 (INPUT_PROP_ACCELEROMETER, bitmask_props)) {
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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_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 (INPUT_PROP_POINTING_STICK, bitmask_props))
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udev_builtin_add_property(dev, test, "ID_INPUT_POINTINGSTICK", "1");
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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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unsigned long bitmask_props[NBITS(INPUT_PROP_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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get_cap_mask(dev, pdev, "properties", bitmask_props, sizeof(bitmask_props), test);
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test_pointers(dev, bitmask_ev, bitmask_abs, bitmask_key,
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bitmask_rel, bitmask_props, 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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