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-rw-r--r--src/udev/udev-builtin-keyboard.c252
1 files changed, 252 insertions, 0 deletions
diff --git a/src/udev/udev-builtin-keyboard.c b/src/udev/udev-builtin-keyboard.c
new file mode 100644
index 0000000..3903bc4
--- /dev/null
+++ b/src/udev/udev-builtin-keyboard.c
@@ -0,0 +1,252 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <sys/ioctl.h>
+#include <linux/input.h>
+
+#include "device-util.h"
+#include "fd-util.h"
+#include "parse-util.h"
+#include "stdio-util.h"
+#include "string-util.h"
+#include "strxcpyx.h"
+#include "udev-builtin.h"
+
+static const struct key_name *keyboard_lookup_key(const char *str, GPERF_LEN_TYPE len);
+#include "keyboard-keys-from-name.h"
+
+static int install_force_release(sd_device *dev, const unsigned *release, unsigned release_count) {
+ sd_device *atkbd;
+ const char *cur;
+ char codes[4096];
+ char *s;
+ size_t l;
+ unsigned i;
+ int r;
+
+ assert(dev);
+ assert(release);
+
+ r = sd_device_get_parent_with_subsystem_devtype(dev, "serio", NULL, &atkbd);
+ if (r < 0)
+ return log_device_error_errno(dev, r, "Failed to get serio parent: %m");
+
+ r = sd_device_get_sysattr_value(atkbd, "force_release", &cur);
+ if (r < 0)
+ return log_device_error_errno(atkbd, r, "Failed to get force-release attribute: %m");
+
+ s = codes;
+ l = sizeof(codes);
+
+ /* copy current content */
+ l = strpcpy(&s, l, cur);
+
+ /* append new codes */
+ for (i = 0; i < release_count; i++)
+ l = strpcpyf(&s, l, ",%u", release[i]);
+
+ log_device_debug(atkbd, "keyboard: updating force-release list with '%s'", codes);
+ r = sd_device_set_sysattr_value(atkbd, "force_release", codes);
+ if (r < 0)
+ return log_device_error_errno(atkbd, r, "Failed to set force-release attribute: %m");
+
+ return 0;
+}
+
+static int map_keycode(sd_device *dev, int fd, int scancode, const char *keycode) {
+ struct {
+ unsigned scan;
+ unsigned key;
+ } map;
+ const struct key_name *k;
+ unsigned keycode_num;
+ int r;
+
+ /* translate identifier to key code */
+ k = keyboard_lookup_key(keycode, strlen(keycode));
+ if (k)
+ keycode_num = k->id;
+ else {
+ /* check if it's a numeric code already */
+ r = safe_atou(keycode, &keycode_num);
+ if (r < 0)
+ return log_device_error_errno(dev, r, "Failed to parse key identifier '%s': %m", keycode);
+ }
+
+ map.scan = scancode;
+ map.key = keycode_num;
+
+ log_device_debug(dev, "keyboard: mapping scan code %u (0x%x) to key code %u (0x%x)",
+ map.scan, map.scan, map.key, map.key);
+
+ if (ioctl(fd, EVIOCSKEYCODE, &map) < 0)
+ return log_device_error_errno(dev, errno, "Failed to call EVIOCSKEYCODE with scan code 0x%x, and key code %u: %m", map.scan, map.key);
+
+ return 0;
+}
+
+static const char* parse_token(const char *current, int32_t *val_out) {
+ char *next;
+ int32_t val;
+
+ if (!current)
+ return NULL;
+
+ val = strtol(current, &next, 0);
+ if (*next && *next != ':')
+ return NULL;
+
+ if (next != current)
+ *val_out = val;
+
+ if (*next)
+ next++;
+
+ return next;
+}
+
+static int override_abs(sd_device *dev, int fd, unsigned evcode, const char *value) {
+ struct input_absinfo absinfo;
+ const char *next;
+
+ if (ioctl(fd, EVIOCGABS(evcode), &absinfo) < 0)
+ return log_device_error_errno(dev, errno, "Failed to call EVIOCGABS");
+
+ next = parse_token(value, &absinfo.minimum);
+ next = parse_token(next, &absinfo.maximum);
+ next = parse_token(next, &absinfo.resolution);
+ next = parse_token(next, &absinfo.fuzz);
+ next = parse_token(next, &absinfo.flat);
+ if (!next)
+ return log_device_error_errno(dev, SYNTHETIC_ERRNO(EINVAL),
+ "Failed to parse EV_ABS override '%s'", value);
+
+ log_device_debug(dev, "keyboard: %x overridden with %"PRIi32"/%"PRIi32"/%"PRIi32"/%"PRIi32"/%"PRIi32,
+ evcode, absinfo.minimum, absinfo.maximum, absinfo.resolution, absinfo.fuzz, absinfo.flat);
+ if (ioctl(fd, EVIOCSABS(evcode), &absinfo) < 0)
+ return log_device_error_errno(dev, errno, "Failed to call EVIOCSABS");
+
+ return 0;
+}
+
+static int set_trackpoint_sensitivity(sd_device *dev, const char *value) {
+ sd_device *pdev;
+ char val_s[DECIMAL_STR_MAX(int)];
+ int r, val_i;
+
+ assert(dev);
+ assert(value);
+
+ /* The sensitivity sysfs attr belongs to the serio parent device */
+ r = sd_device_get_parent_with_subsystem_devtype(dev, "serio", NULL, &pdev);
+ if (r < 0)
+ return log_device_error_errno(dev, r, "Failed to get serio parent: %m");
+
+ r = safe_atoi(value, &val_i);
+ if (r < 0)
+ return log_device_error_errno(dev, r, "Failed to parse POINTINGSTICK_SENSITIVITY '%s': %m", value);
+ else if (val_i < 0 || val_i > 255)
+ return log_device_error_errno(dev, SYNTHETIC_ERRNO(ERANGE), "POINTINGSTICK_SENSITIVITY %d outside range [0..255]", val_i);
+
+ xsprintf(val_s, "%d", val_i);
+
+ r = sd_device_set_sysattr_value(pdev, "sensitivity", val_s);
+ if (r < 0)
+ return log_device_error_errno(dev, r, "Failed to write 'sensitivity' attribute: %m");
+
+ return 0;
+}
+
+static int builtin_keyboard(UdevEvent *event, int argc, char *argv[], bool test) {
+ sd_device *dev = ASSERT_PTR(ASSERT_PTR(event)->dev);
+ unsigned release[1024];
+ unsigned release_count = 0;
+ _cleanup_close_ int fd = -EBADF;
+ const char *node;
+ int has_abs = -1, r;
+
+ r = sd_device_get_devname(dev, &node);
+ if (r < 0)
+ return log_device_error_errno(dev, r, "Failed to get device name: %m");
+
+ FOREACH_DEVICE_PROPERTY(dev, key, value)
+ if (startswith(key, "KEYBOARD_KEY_")) {
+ const char *keycode = value;
+ unsigned scancode;
+
+ /* KEYBOARD_KEY_<hex scan code>=<key identifier string> */
+ r = safe_atou_full(key + 13, 16, &scancode);
+ if (r < 0) {
+ log_device_warning_errno(dev, r, "Failed to parse scan code from \"%s\", ignoring: %m", key);
+ continue;
+ }
+
+ /* a leading '!' needs a force-release entry */
+ if (keycode[0] == '!') {
+ keycode++;
+
+ release[release_count] = scancode;
+ if (release_count < ELEMENTSOF(release)-1)
+ release_count++;
+
+ if (keycode[0] == '\0')
+ continue;
+ }
+
+ if (fd < 0) {
+ fd = sd_device_open(dev, O_RDWR|O_CLOEXEC|O_NONBLOCK|O_NOCTTY);
+ if (fd < 0)
+ return log_device_error_errno(dev, fd, "Failed to open device '%s': %m", node);
+ }
+
+ (void) map_keycode(dev, fd, scancode, keycode);
+ } else if (startswith(key, "EVDEV_ABS_")) {
+ unsigned evcode;
+
+ /* EVDEV_ABS_<EV_ABS code>=<min>:<max>:<res>:<fuzz>:<flat> */
+ r = safe_atou_full(key + 10, 16, &evcode);
+ if (r < 0) {
+ log_device_warning_errno(dev, r, "Failed to parse EV_ABS code from \"%s\", ignoring: %m", key);
+ continue;
+ }
+
+ if (fd < 0) {
+ fd = sd_device_open(dev, O_RDWR|O_CLOEXEC|O_NONBLOCK|O_NOCTTY);
+ if (fd < 0)
+ return log_device_error_errno(dev, fd, "Failed to open device '%s': %m", node);
+ }
+
+ if (has_abs == -1) {
+ unsigned long bits;
+ int rc;
+
+ rc = ioctl(fd, EVIOCGBIT(0, sizeof(bits)), &bits);
+ if (rc < 0)
+ return log_device_error_errno(dev, errno, "Failed to set EVIOCGBIT");
+
+ has_abs = !!(bits & (1 << EV_ABS));
+ if (!has_abs)
+ log_device_warning(dev, "EVDEV_ABS override set but no EV_ABS present on device");
+ }
+
+ if (!has_abs)
+ continue;
+
+ (void) override_abs(dev, fd, evcode, value);
+ } else if (streq(key, "POINTINGSTICK_SENSITIVITY"))
+ (void) set_trackpoint_sensitivity(dev, value);
+
+ /* install list of force-release codes */
+ if (release_count > 0)
+ (void) install_force_release(dev, release, release_count);
+
+ return 0;
+}
+
+const UdevBuiltin udev_builtin_keyboard = {
+ .name = "keyboard",
+ .cmd = builtin_keyboard,
+ .help = "Keyboard scancode mapping and touchpad/pointingstick characteristics",
+};