/* * expose input properties via udev * * Copyright (C) 2009 Martin Pitt <martin.pitt@ubuntu.com> * Portions Copyright (C) 2004 David Zeuthen, <david@fubar.dk> * Copyright (C) 2011 Kay Sievers <kay@vrfy.org> * Copyright (C) 2014 Carlos Garnacho <carlosg@gnome.org> * Copyright (C) 2014 David Herrmann <dh.herrmann@gmail.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 this program. If not, see <http://www.gnu.org/licenses/>. */ #include <stdio.h> #include <stdlib.h> #include <stdarg.h> #include <unistd.h> #include <string.h> #include <errno.h> #include <linux/limits.h> #include <linux/input.h> #include "udev.h" #include "util.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 inline int abs_size_mm(const struct input_absinfo *absinfo) { /* Resolution is defined to be in units/mm for ABS_X/Y */ return (absinfo->maximum - absinfo->minimum) / absinfo->resolution; } static void extract_info(struct udev_device *dev, const char *devpath, bool test) { char width[DECIMAL_STR_MAX(int)], height[DECIMAL_STR_MAX(int)]; struct input_absinfo xabsinfo = {}, yabsinfo = {}; _cleanup_close_ int fd = -1; fd = open(devpath, O_RDONLY|O_CLOEXEC); if (fd < 0) return; if (ioctl(fd, EVIOCGABS(ABS_X), &xabsinfo) < 0 || ioctl(fd, EVIOCGABS(ABS_Y), &yabsinfo) < 0) return; if (xabsinfo.resolution <= 0 || yabsinfo.resolution <= 0) return; snprintf(width, sizeof(width), "%d", abs_size_mm(&xabsinfo)); snprintf(height, sizeof(height), "%d", abs_size_mm(&yabsinfo)); udev_builtin_add_property(dev, test, "ID_INPUT_WIDTH_MM", width); udev_builtin_add_property(dev, test, "ID_INPUT_HEIGHT_MM", height); } /* * Read a capability attribute and return bitmask. * @param dev udev_device * @param attr sysfs attribute name (e. g. "capabilities/key") * @param bitmask: Output array which has a sizeof of bitmask_size */ static void get_cap_mask(struct udev_device *dev, struct udev_device *pdev, const char* attr, unsigned long *bitmask, size_t bitmask_size, bool test) { const char *v; char text[4096]; unsigned i; char* word; unsigned long val; v = udev_device_get_sysattr_value(pdev, attr); if (!v) v = ""; snprintf(text, sizeof(text), "%s", v); log_debug("%s raw kernel attribute: %s", attr, text); memzero(bitmask, bitmask_size); i = 0; while ((word = strrchr(text, ' ')) != NULL) { val = strtoul (word+1, NULL, 16); if (i < bitmask_size/sizeof(unsigned long)) bitmask[i] = val; else log_debug("ignoring %s block %lX which is larger than maximum size", attr, val); *word = '\0'; ++i; } val = strtoul (text, NULL, 16); if (i < bitmask_size / sizeof(unsigned long)) bitmask[i] = val; else log_debug("ignoring %s block %lX which is larger than maximum size", attr, val); if (test) { /* printf pattern with the right unsigned long number of hex chars */ snprintf(text, sizeof(text), " bit %%4u: %%0%zulX\n", 2 * sizeof(unsigned long)); log_debug("%s decoded bit map:", attr); val = bitmask_size / sizeof (unsigned long); /* skip over leading zeros */ while (bitmask[val-1] == 0 && val > 0) --val; for (i = 0; i < val; ++i) { DISABLE_WARNING_FORMAT_NONLITERAL; log_debug(text, i * BITS_PER_LONG, bitmask[i]); REENABLE_WARNING; } } } /* pointer devices */ static bool test_pointers(struct udev_device *dev, const unsigned long* bitmask_ev, const unsigned long* bitmask_abs, const unsigned long* bitmask_key, const unsigned long* bitmask_rel, const unsigned long* bitmask_props, bool test) { bool has_abs_coordinates = false; bool has_rel_coordinates = false; bool has_mt_coordinates = false; bool has_joystick_axes_or_buttons = false; bool is_direct = false; bool has_touch = false; bool has_3d_coordinates = false; bool has_keys = false; bool stylus_or_pen = false; bool finger_but_no_pen = false; bool has_mouse_button = false; bool is_mouse = false; bool is_touchpad = false; bool is_touchscreen = false; bool is_tablet = false; bool is_joystick = false; bool is_accelerometer = false; bool is_pointing_stick= false; has_keys = test_bit(EV_KEY, bitmask_ev); has_abs_coordinates = test_bit(ABS_X, bitmask_abs) && test_bit(ABS_Y, bitmask_abs); has_3d_coordinates = has_abs_coordinates && test_bit(ABS_Z, bitmask_abs); is_accelerometer = test_bit(INPUT_PROP_ACCELEROMETER, bitmask_props); if (!has_keys && has_3d_coordinates) is_accelerometer = true; if (is_accelerometer) { udev_builtin_add_property(dev, test, "ID_INPUT_ACCELEROMETER", "1"); return true; } is_pointing_stick = test_bit(INPUT_PROP_POINTING_STICK, bitmask_props); stylus_or_pen = test_bit(BTN_STYLUS, bitmask_key) || test_bit(BTN_TOOL_PEN, bitmask_key); finger_but_no_pen = test_bit(BTN_TOOL_FINGER, bitmask_key) && !test_bit(BTN_TOOL_PEN, bitmask_key); has_mouse_button = test_bit(BTN_LEFT, bitmask_key); has_rel_coordinates = test_bit(EV_REL, bitmask_ev) && test_bit(REL_X, bitmask_rel) && test_bit(REL_Y, bitmask_rel); has_mt_coordinates = test_bit(ABS_MT_POSITION_X, bitmask_abs) && test_bit(ABS_MT_POSITION_Y, bitmask_abs); /* unset has_mt_coordinates if devices claims to have all abs axis */ if(has_mt_coordinates && test_bit(ABS_MT_SLOT, bitmask_abs) && test_bit(ABS_MT_SLOT - 1, bitmask_abs)) has_mt_coordinates = false; is_direct = test_bit(INPUT_PROP_DIRECT, bitmask_props); has_touch = test_bit(BTN_TOUCH, bitmask_key); /* joysticks don't necessarily have buttons; e. g. * rudders/pedals are joystick-like, but buttonless; they have * other fancy axes */ has_joystick_axes_or_buttons = test_bit(BTN_TRIGGER, bitmask_key) || test_bit(BTN_A, bitmask_key) || test_bit(BTN_1, bitmask_key) || test_bit(ABS_RX, bitmask_abs) || test_bit(ABS_RY, bitmask_abs) || test_bit(ABS_RZ, bitmask_abs) || test_bit(ABS_THROTTLE, bitmask_abs) || test_bit(ABS_RUDDER, bitmask_abs) || test_bit(ABS_WHEEL, bitmask_abs) || test_bit(ABS_GAS, bitmask_abs) || test_bit(ABS_BRAKE, bitmask_abs); if (has_abs_coordinates) { if (stylus_or_pen) is_tablet = true; else if (finger_but_no_pen && !is_direct) is_touchpad = true; else if (has_mouse_button) /* This path is taken by VMware's USB mouse, which has * absolute axes, but no touch/pressure button. */ is_mouse = true; else if (has_touch) is_touchscreen = true; else if (has_joystick_axes_or_buttons) is_joystick = true; } if (has_mt_coordinates && is_direct) is_touchscreen = true; if (has_rel_coordinates && has_mouse_button) is_mouse = true; if (is_pointing_stick) udev_builtin_add_property(dev, test, "ID_INPUT_POINTINGSTICK", "1"); if (is_mouse) udev_builtin_add_property(dev, test, "ID_INPUT_MOUSE", "1"); if (is_touchpad) udev_builtin_add_property(dev, test, "ID_INPUT_TOUCHPAD", "1"); if (is_touchscreen) udev_builtin_add_property(dev, test, "ID_INPUT_TOUCHSCREEN", "1"); if (is_joystick) udev_builtin_add_property(dev, test, "ID_INPUT_JOYSTICK", "1"); if (is_tablet) udev_builtin_add_property(dev, test, "ID_INPUT_TABLET", "1"); return is_tablet || is_mouse || is_touchpad || is_touchscreen || is_joystick || is_pointing_stick; } /* key like devices */ static bool test_key(struct udev_device *dev, const unsigned long* bitmask_ev, const unsigned long* bitmask_key, bool test) { unsigned i; unsigned long found; unsigned long mask; bool ret = false; /* do we have any KEY_* capability? */ if (!test_bit(EV_KEY, bitmask_ev)) { log_debug("test_key: no EV_KEY capability"); return false; } /* only consider KEY_* here, not BTN_* */ found = 0; for (i = 0; i < BTN_MISC/BITS_PER_LONG; ++i) { found |= bitmask_key[i]; log_debug("test_key: checking bit block %lu for any keys; found=%i", (unsigned long)i*BITS_PER_LONG, found > 0); } /* If there are no keys in the lower block, check the higher block */ if (!found) { for (i = KEY_OK; i < BTN_TRIGGER_HAPPY; ++i) { if (test_bit(i, bitmask_key)) { log_debug("test_key: Found key %x in high block", i); found = 1; break; } } } if (found > 0) { udev_builtin_add_property(dev, test, "ID_INPUT_KEY", "1"); ret = true; } /* 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) { udev_builtin_add_property(dev, test, "ID_INPUT_KEYBOARD", "1"); ret = true; } return ret; } static int builtin_input_id(struct udev_device *dev, int argc, char *argv[], bool test) { struct udev_device *pdev; unsigned long bitmask_ev[NBITS(EV_MAX)]; unsigned long bitmask_abs[NBITS(ABS_MAX)]; unsigned long bitmask_key[NBITS(KEY_MAX)]; unsigned long bitmask_rel[NBITS(REL_MAX)]; unsigned long bitmask_props[NBITS(INPUT_PROP_MAX)]; const char *sysname, *devnode; bool is_pointer; bool is_key; assert(dev); /* walk up the parental chain until we find the real input device; the * argument is very likely a subdevice of this, like eventN */ pdev = dev; while (pdev != NULL && udev_device_get_sysattr_value(pdev, "capabilities/ev") == NULL) pdev = udev_device_get_parent_with_subsystem_devtype(pdev, "input", NULL); if (pdev) { /* 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 */ udev_builtin_add_property(dev, test, "ID_INPUT", "1"); get_cap_mask(dev, pdev, "capabilities/ev", bitmask_ev, sizeof(bitmask_ev), test); get_cap_mask(dev, pdev, "capabilities/abs", bitmask_abs, sizeof(bitmask_abs), test); get_cap_mask(dev, pdev, "capabilities/rel", bitmask_rel, sizeof(bitmask_rel), test); get_cap_mask(dev, pdev, "capabilities/key", bitmask_key, sizeof(bitmask_key), test); get_cap_mask(dev, pdev, "properties", bitmask_props, sizeof(bitmask_props), test); is_pointer = test_pointers(dev, bitmask_ev, bitmask_abs, bitmask_key, bitmask_rel, bitmask_props, test); is_key = test_key(dev, bitmask_ev, bitmask_key, test); /* Some evdev nodes have only a scrollwheel */ if (!is_pointer && !is_key && test_bit(EV_REL, bitmask_ev) && (test_bit(REL_WHEEL, bitmask_rel) || test_bit(REL_HWHEEL, bitmask_rel))) udev_builtin_add_property(dev, test, "ID_INPUT_KEY", "1"); } devnode = udev_device_get_devnode(dev); sysname = udev_device_get_sysname(dev); if (devnode && sysname && startswith(sysname, "event")) extract_info(dev, devnode, test); return EXIT_SUCCESS; } const struct udev_builtin udev_builtin_input_id = { .name = "input_id", .cmd = builtin_input_id, .help = "Input device properties", };