diff options
Diffstat (limited to 'src/udev/udev-builtin-input_id.c')
| -rw-r--r-- | src/udev/udev-builtin-input_id.c | 364 |
1 files changed, 364 insertions, 0 deletions
diff --git a/src/udev/udev-builtin-input_id.c b/src/udev/udev-builtin-input_id.c new file mode 100644 index 0000000..e3db55b --- /dev/null +++ b/src/udev/udev-builtin-input_id.c @@ -0,0 +1,364 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * expose input properties via udev + * + * 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 "device-util.h" +#include "fd-util.h" +#include "missing.h" +#include "stdio-util.h" +#include "string-util.h" +#include "udev-builtin.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 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, 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 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; + + 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, ' ')) != NULL) { + val = strtoul(word+1, NULL, 16); + 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; + } + val = strtoul (text, NULL, 16); + 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) { + /* printf pattern with the right unsigned long number of hex chars */ + xsprintf(text, " bit %%4u: %%0%zulX\n", + 2 * sizeof(unsigned long)); + log_device_debug(pdev, "%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_device_debug(pdev, text, i * BITS_PER_LONG, bitmask[i]); + REENABLE_WARNING; + } + } +} + +/* pointer devices */ +static bool test_pointers(sd_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(sd_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_device_debug(dev, "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_device_debug(dev, "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_device_debug(dev, "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(sd_device *dev, int argc, char *argv[], bool test) { + sd_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 */ + 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) { + /* 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, 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_devname(dev, &devnode) >= 0 && + sd_device_get_sysname(dev, &sysname) >= 0 && + startswith(sysname, "event")) + extract_info(dev, devnode, test); + + return 0; +} + +const struct udev_builtin udev_builtin_input_id = { + .name = "input_id", + .cmd = builtin_input_id, + .help = "Input device properties", +}; |