diff options
Diffstat (limited to 'src/udev/udev-builtin-keyboard.c')
| -rw-r--r-- | src/udev/udev-builtin-keyboard.c | 252 |
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", +}; 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