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-rw-r--r--src/udev/udev-builtin-input_id.c395
1 files changed, 395 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..6a4911c
--- /dev/null
+++ b/src/udev/udev-builtin-input_id.c
@@ -0,0 +1,395 @@
+/* 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 <stdlib.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, 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;
+ }
+ }
+}
+
+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) {
+ 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 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_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 (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 (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 (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_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 (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;
+
+ 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");
+ if (is_tablet_pad)
+ udev_builtin_add_property(dev, test, "ID_INPUT_TABLET_PAD", "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) {
+ 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_devname(dev, &devnode) >= 0 &&
+ sd_device_get_sysname(dev, &sysname) >= 0 &&
+ startswith(sysname, "event"))
+ extract_info(dev, devnode, test);
+
+ return 0;
+}
+
+const UdevBuiltin udev_builtin_input_id = {
+ .name = "input_id",
+ .cmd = builtin_input_id,
+ .help = "Input device properties",
+};
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