/* SPDX-License-Identifier: GPL-2.0-or-later */ /* * expose input properties via udev * * Portions Copyright © 2004 David Zeuthen, * Copyright © 2014 Carlos Garnacho */ #include #include #include #include #include #include "device-util.h" #include "fd-util.h" #include "missing_input.h" #include "parse-util.h" #include "stdio-util.h" #include "string-util.h" #include "udev-builtin.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(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 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(sd_device *dev, bool test) { char width[DECIMAL_STR_MAX(int)], height[DECIMAL_STR_MAX(int)]; struct input_absinfo xabsinfo = {}, yabsinfo = {}; _cleanup_close_ int fd = -EBADF; fd = sd_device_open(dev, O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_NOCTTY); 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 sd_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(sd_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; int r; if (sd_device_get_sysattr_value(pdev, attr, &v) < 0) v = ""; xsprintf(text, "%s", v); log_device_debug(pdev, "%s raw kernel attribute: %s", attr, text); memzero(bitmask, bitmask_size); i = 0; while ((word = strrchr(text, ' '))) { r = safe_atolu_full(word+1, 16, &val); if (r < 0) log_device_debug_errno(pdev, r, "Ignoring %s block which failed to parse: %m", attr); else if (i < bitmask_size / sizeof(unsigned long)) bitmask[i] = val; else log_device_debug(pdev, "Ignoring %s block %lX which is larger than maximum size", attr, val); *word = '\0'; i++; } r = safe_atolu_full(text, 16, &val); if (r < 0) log_device_debug_errno(pdev, r, "Ignoring %s block which failed to parse: %m", attr); else if (i < bitmask_size / sizeof(unsigned long)) bitmask[i] = val; else log_device_debug(pdev, "Ignoring %s block %lX which is larger than maximum size", attr, val); if (test && DEBUG_LOGGING) { log_device_debug(pdev, "%s decoded bit map:", attr); val = bitmask_size / sizeof (unsigned long); /* skip trailing zeros */ while (bitmask[val-1] == 0 && val > 0) --val; /* IN_SET() cannot be used in assert_cc(). */ assert_cc(sizeof(unsigned long) == 4 || sizeof(unsigned long) == 8); for (unsigned long j = 0; j < val; j++) log_device_debug(pdev, sizeof(unsigned long) == 4 ? " bit %4lu: %08lX\n" : " bit %4lu: %016lX\n", j * BITS_PER_LONG, bitmask[j]); } } static struct input_id get_input_id(sd_device *dev) { const char *v; struct input_id id = {}; if (sd_device_get_sysattr_value(dev, "id/bustype", &v) >= 0) (void) safe_atoux16(v, &id.bustype); if (sd_device_get_sysattr_value(dev, "id/vendor", &v) >= 0) (void) safe_atoux16(v, &id.vendor); if (sd_device_get_sysattr_value(dev, "id/product", &v) >= 0) (void) safe_atoux16(v, &id.product); if (sd_device_get_sysattr_value(dev, "id/version", &v) >= 0) (void) safe_atoux16(v, &id.version); return id; } /* pointer devices */ static bool test_pointers(sd_device *dev, const struct input_id *id, 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; size_t num_joystick_axes = 0; size_t num_joystick_buttons = 0; bool has_pad_buttons = false; bool is_direct = false; bool has_touch = false; bool has_3d_coordinates = false; bool has_keys = false; bool has_stylus = false; bool has_pen = false; bool finger_but_no_pen = false; bool has_mouse_button = false; bool is_mouse = false; bool is_abs_mouse = false; bool is_touchpad = false; bool is_touchscreen = false; bool is_tablet = false; bool is_tablet_pad = false; bool is_joystick = false; bool is_accelerometer = false; bool is_pointing_stick = false; bool has_wheel = 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); has_stylus = test_bit(BTN_STYLUS, bitmask_key); has_pen = 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 (int 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); has_pad_buttons = test_bit(BTN_0, bitmask_key) && test_bit(BTN_1, bitmask_key) && !has_pen; has_wheel = test_bit(EV_REL, bitmask_ev) && (test_bit(REL_WHEEL, bitmask_rel) || test_bit(REL_HWHEEL, bitmask_rel)); /* 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 (int button = BTN_JOYSTICK; button < BTN_DIGI; button++) if (test_bit(button, bitmask_key)) num_joystick_buttons++; for (int button = BTN_TRIGGER_HAPPY1; button <= BTN_TRIGGER_HAPPY40; button++) if (test_bit(button, bitmask_key)) num_joystick_buttons++; for (int button = BTN_DPAD_UP; button <= BTN_DPAD_RIGHT; button++) if (test_bit(button, bitmask_key)) num_joystick_buttons++; } for (int axis = ABS_RX; axis < ABS_PRESSURE; axis++) if (test_bit(axis, bitmask_abs)) num_joystick_axes++; if (has_abs_coordinates) { if (has_stylus || has_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_abs_mouse = true; else if (has_touch || is_direct) is_touchscreen = true; else if (num_joystick_buttons > 0 || num_joystick_axes > 0) is_joystick = true; } else if (num_joystick_buttons > 0 || num_joystick_axes > 0) is_joystick = true; if (has_mt_coordinates) { if (has_stylus || has_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 && has_pad_buttons) is_tablet_pad = true; if (has_pad_buttons && has_wheel && !has_rel_coordinates) { is_tablet = true; is_tablet_pad = 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; /* There is no such thing as an i2c mouse */ if (is_mouse && id->bustype == BUS_I2C) is_pointing_stick = true; /* Joystick un-detection. Some keyboards have random joystick buttons * set. Avoid those being labeled as ID_INPUT_JOYSTICK with some heuristics. * The well-known keys represent a (randomly picked) set of key groups. * A joystick may have one of those but probably not several. And a joystick with less than 2 buttons * or axes is not a joystick either. * libinput uses similar heuristics, any changes here should be added to libinput too. */ if (is_joystick) { static const unsigned int well_known_keyboard_keys[] = { KEY_LEFTCTRL, KEY_CAPSLOCK, KEY_NUMLOCK, KEY_INSERT, KEY_MUTE, KEY_CALC, KEY_FILE, KEY_MAIL, KEY_PLAYPAUSE, KEY_BRIGHTNESSDOWN, }; size_t num_well_known_keys = 0; if (has_keys) for (size_t i = 0; i < ELEMENTSOF(well_known_keyboard_keys); i++) if (test_bit(well_known_keyboard_keys[i], bitmask_key)) num_well_known_keys++; if (num_well_known_keys >= 4 || num_joystick_buttons + num_joystick_axes < 2) { log_device_debug(dev, "Input device has %zu joystick buttons and %zu axes but also %zu keyboard key sets, " "assuming this is a keyboard, not a joystick.", num_joystick_buttons, num_joystick_axes, num_well_known_keys); is_joystick = false; } if (has_wheel && has_pad_buttons) { log_device_debug(dev, "Input device has %zu joystick buttons as well as tablet pad buttons, " "assuming this is a tablet pad, not a joystick.", num_joystick_buttons); is_joystick = false; } } if (is_pointing_stick) udev_builtin_add_property(dev, test, "ID_INPUT_POINTINGSTICK", "1"); if (is_mouse || is_abs_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"); if (is_tablet_pad) udev_builtin_add_property(dev, test, "ID_INPUT_TABLET_PAD", "1"); return is_tablet || is_mouse || is_abs_mouse || is_touchpad || is_touchscreen || is_joystick || is_pointing_stick; } /* key like devices */ static bool test_key(sd_device *dev, const unsigned long* bitmask_ev, const unsigned long* bitmask_key, bool test) { bool found = false; /* do we have any KEY_* capability? */ if (!test_bit(EV_KEY, bitmask_ev)) { log_device_debug(dev, "test_key: no EV_KEY capability"); return false; } /* only consider KEY_* here, not BTN_* */ for (size_t i = 0; i < BTN_MISC/BITS_PER_LONG && !found; i++) { if (bitmask_key[i]) found = true; log_device_debug(dev, "test_key: checking bit block %zu for any keys; found=%s", i * BITS_PER_LONG, yes_no(found)); } /* If there are no keys in the lower block, check the higher blocks */ for (size_t block = 0; block < sizeof(high_key_blocks) / sizeof(struct range) && !found; block++) for (unsigned i = high_key_blocks[block].start; i < high_key_blocks[block].end && !found; i++) if (test_bit(i, bitmask_key)) { log_device_debug(dev, "test_key: Found key %x in high block", i); found = true; } if (found) udev_builtin_add_property(dev, test, "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 */ if (FLAGS_SET(bitmask_key[0], 0xFFFFFFFE)) { udev_builtin_add_property(dev, test, "ID_INPUT_KEYBOARD", "1"); return true; } return found; } static int builtin_input_id(UdevEvent *event, int argc, char *argv[], bool test) { sd_device *pdev, *dev = ASSERT_PTR(ASSERT_PTR(event)->dev); 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; bool is_pointer; bool is_key; /* walk up the parental chain until we find the real input device; the * argument is very likely a subdevice of this, like eventN */ for (pdev = dev; pdev; ) { const char *s; if (sd_device_get_sysattr_value(pdev, "capabilities/ev", &s) >= 0) break; if (sd_device_get_parent_with_subsystem_devtype(pdev, "input", NULL, &pdev) >= 0) continue; pdev = NULL; break; } if (pdev) { struct input_id id = get_input_id(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(pdev, "capabilities/ev", bitmask_ev, sizeof(bitmask_ev), test); get_cap_mask(pdev, "capabilities/abs", bitmask_abs, sizeof(bitmask_abs), test); get_cap_mask(pdev, "capabilities/rel", bitmask_rel, sizeof(bitmask_rel), test); get_cap_mask(pdev, "capabilities/key", bitmask_key, sizeof(bitmask_key), test); get_cap_mask(pdev, "properties", bitmask_props, sizeof(bitmask_props), test); is_pointer = test_pointers(dev, &id, 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"); } if (sd_device_get_sysname(dev, &sysname) >= 0 && startswith(sysname, "event")) extract_info(dev, test); return 0; } const UdevBuiltin udev_builtin_input_id = { .name = "input_id", .cmd = builtin_input_id, .help = "Input device properties", };