/* SPDX-License-Identifier: GPL-2.0+ */ /* * expose input properties via udev * * Copyright © 2009 Martin Pitt * Portions Copyright © 2004 David Zeuthen, * Copyright © 2014 Carlos Garnacho * */ #include #include #include #include #include #include #include #include #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(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", };