| /* SPDX-License-Identifier: GPL-2.0+ */ |
| /* |
| * expose input properties via udev |
| * |
| * Copyright © 2009 Martin Pitt <martin.pitt@ubuntu.com> |
| * Portions Copyright © 2004 David Zeuthen, <david@fubar.dk> |
| * Copyright © 2014 Carlos Garnacho <carlosg@gnome.org> |
| * |
| */ |
| |
| #include <errno.h> |
| #include <stdarg.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <unistd.h> |
| #include <linux/limits.h> |
| #include <linux/input.h> |
| |
| #include "fd-util.h" |
| #include "missing.h" |
| #include "stdio-util.h" |
| #include "string-util.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) |
| |
| struct range { |
| unsigned start; |
| unsigned end; |
| }; |
| |
| /* key code ranges above BTN_MISC (start is inclusive, stop is exclusive)*/ |
| static const struct range high_key_blocks[] = { |
| { KEY_OK, BTN_DPAD_UP }, |
| { KEY_ALS_TOGGLE, BTN_TRIGGER_HAPPY } |
| }; |
| |
| 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; |
| |
| xsprintf(width, "%d", abs_size_mm(&xabsinfo)); |
| xsprintf(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); |
| v = strempty(v); |
| |
| xsprintf(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 */ |
| xsprintf(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) { |
| int button, axis; |
| 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); |
| for (button = BTN_MOUSE; button < BTN_JOYSTICK && !has_mouse_button; button++) |
| has_mouse_button = test_bit(button, 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. Others have buttons only but no axes. |
| * |
| * The BTN_JOYSTICK range starts after the mouse range, so a mouse |
| * with more than 16 buttons runs into the joystick range (e.g. Mad |
| * Catz Mad Catz M.M.O.TE). Skip those. |
| */ |
| if (!test_bit(BTN_JOYSTICK - 1, bitmask_key)) { |
| for (button = BTN_JOYSTICK; button < BTN_DIGI && !has_joystick_axes_or_buttons; button++) |
| has_joystick_axes_or_buttons = test_bit(button, bitmask_key); |
| for (button = BTN_TRIGGER_HAPPY1; button <= BTN_TRIGGER_HAPPY40 && !has_joystick_axes_or_buttons; button++) |
| has_joystick_axes_or_buttons = test_bit(button, bitmask_key); |
| for (button = BTN_DPAD_UP; button <= BTN_DPAD_RIGHT && !has_joystick_axes_or_buttons; button++) |
| has_joystick_axes_or_buttons = test_bit(button, bitmask_key); |
| } |
| for (axis = ABS_RX; axis < ABS_PRESSURE && !has_joystick_axes_or_buttons; axis++) |
| has_joystick_axes_or_buttons = test_bit(axis, 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_direct) |
| is_touchscreen = true; |
| else if (has_joystick_axes_or_buttons) |
| is_joystick = true; |
| } else if (has_joystick_axes_or_buttons) { |
| is_joystick = true; |
| } |
| |
| if (has_mt_coordinates) { |
| if (stylus_or_pen) |
| is_tablet = true; |
| else if (finger_but_no_pen && !is_direct) |
| is_touchpad = true; |
| else if (has_touch || is_direct) |
| is_touchscreen = true; |
| } |
| |
| if (!is_tablet && !is_touchpad && !is_joystick && |
| has_mouse_button && |
| (has_rel_coordinates || |
| !has_abs_coordinates)) /* mouse buttons and no axis */ |
| 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 blocks */ |
| if (!found) { |
| unsigned block; |
| for (block = 0; block < (sizeof(high_key_blocks) / sizeof(struct range)); ++block) { |
| for (i = high_key_blocks[block].start; i < high_key_blocks[block].end; ++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 (FLAGS_SET(bitmask_key[0], 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"); |
| if (test_bit(EV_SW, bitmask_ev)) |
| udev_builtin_add_property(dev, test, "ID_INPUT_SWITCH", "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", |
| }; |