diff options
Diffstat (limited to 'src/udev/udev-builtin-input_id.c')
| -rw-r--r-- | src/udev/udev-builtin-input_id.c | 422 |
1 files changed, 422 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..0742120 --- /dev/null +++ b/src/udev/udev-builtin-input_id.c @@ -0,0 +1,422 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * expose input properties via udev + * + * Portions Copyright © 2004 David Zeuthen, <david@fubar.dk> + * Copyright © 2014 Carlos Garnacho <carlosg@gnome.org> + */ + +#include <errno.h> +#include <fcntl.h> +#include <stdarg.h> +#include <unistd.h> +#include <linux/limits.h> + +#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" +#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, bool test) { + char width[DECIMAL_STR_MAX(int)], height[DECIMAL_STR_MAX(int)]; + struct input_absinfo xabsinfo = {}, yabsinfo = {}; + _cleanup_close_ int fd = -1; + + 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; + + 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) && has_stylus && !has_pen; + + /* 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 (!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 (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(sd_device *dev, sd_netlink **rtnl, 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; + 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) { + 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", +}; |