src/udev/udev-builtin-keyboard.c - systemd-stable - Rivoreo Source Code Repositories

 /* SPDX-License-Identifier: LGPL-2.1+ */
 /***
   This file is part of systemd.

   Copyright 2013 Kay Sievers <kay@vrfy.org>

   systemd is free software; you can redistribute it and/or modify it
   under the terms of the GNU Lesser General Public License as published by
   the Free Software Foundation; either version 2.1 of the License, or
   (at your option) any later version.

   systemd is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public License
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/

 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <sys/ioctl.h>
 #include <linux/input.h>

 #include "fd-util.h"
 #include "parse-util.h"
 #include "stdio-util.h"
 #include "string-util.h"
 #include "udev.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(struct udev_device *dev, const unsigned *release, unsigned release_count) {
         struct udev_device *atkbd;
         const char *cur;
         char codes[4096];
         char *s;
         size_t l;
         unsigned i;
         int ret;

         assert(dev);
         assert(release);

         atkbd = udev_device_get_parent_with_subsystem_devtype(dev, "serio", NULL);
         if (!atkbd)
                 return -ENODEV;

         cur = udev_device_get_sysattr_value(atkbd, "force_release");
         if (!cur)
                 return -ENODEV;

         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_debug("keyboard: updating force-release list with '%s'", codes);
         ret = udev_device_set_sysattr_value(atkbd, "force_release", codes);
         if (ret < 0)
                 log_error_errno(ret, "Error writing force-release attribute: %m");
         return ret;
 }

 static void map_keycode(int fd, const char *devnode, int scancode, const char *keycode)
 {
         struct {
                 unsigned scan;
                 unsigned key;
         } map;
         char *endptr;
         const struct key_name *k;
         unsigned keycode_num;

         /* 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 */
                 keycode_num = strtoul(keycode, &endptr, 0);
                 if (endptr[0] !='\0') {
                         log_error("Unknown key identifier '%s'", keycode);
                         return;
                 }
         }

         map.scan = scancode;
         map.key = keycode_num;

         log_debug("keyboard: mapping scan code %d (0x%x) to key code %d (0x%x)",
                   map.scan, map.scan, map.key, map.key);

         if (ioctl(fd, EVIOCSKEYCODE, &map) < 0)
                 log_error_errno(errno, "Error calling EVIOCSKEYCODE on device node '%s' (scan code 0x%x, key code %d): %m", devnode, map.scan, map.key);
 }

 static inline 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 void override_abs(int fd, const char *devnode,
                          unsigned evcode, const char *value) {
         struct input_absinfo absinfo;
         int rc;
         char *next;

         rc = ioctl(fd, EVIOCGABS(evcode), &absinfo);
         if (rc < 0) {
                 log_error_errno(errno, "Unable to EVIOCGABS device \"%s\"", devnode);
                 return;
         }

         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) {
                 log_error("Unable to parse EV_ABS override '%s' for '%s'", value, devnode);
                 return;
         }

         log_debug("keyboard: %x overridden with %"PRIi32"/%"PRIi32"/%"PRIi32"/%"PRIi32"/%"PRIi32" for \"%s\"",
                   evcode,
                   absinfo.minimum, absinfo.maximum, absinfo.resolution, absinfo.fuzz, absinfo.flat,
                   devnode);
         rc = ioctl(fd, EVIOCSABS(evcode), &absinfo);
         if (rc < 0)
                 log_error_errno(errno, "Unable to EVIOCSABS device \"%s\"", devnode);
 }

 static void set_trackpoint_sensitivity(struct udev_device *dev, const char *value)
 {
         struct udev_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 */
         pdev = udev_device_get_parent_with_subsystem_devtype(dev, "serio", NULL);
         if (!pdev) {
                 log_warning("Failed to get serio parent for '%s'", udev_device_get_devnode(dev));
                 return;
         }

         r = safe_atoi(value, &val_i);
         if (r < 0) {
                 log_error("Unable to parse POINTINGSTICK_SENSITIVITY '%s' for '%s'", value, udev_device_get_devnode(dev));
                 return;
         } else if (val_i < 0 || val_i > 255) {
                 log_error("POINTINGSTICK_SENSITIVITY %d outside range [0..255] for '%s' ", val_i, udev_device_get_devnode(dev));
                 return;
         }

         xsprintf(val_s, "%d", val_i);

         r = udev_device_set_sysattr_value(pdev, "sensitivity", val_s);
         if (r < 0)
                 log_error_errno(r, "Failed to write 'sensitivity' attribute for '%s': %m", udev_device_get_devnode(pdev));
 }

 static int open_device(const char *devnode) {
         int fd;

         fd = open(devnode, O_RDWR|O_CLOEXEC|O_NONBLOCK|O_NOCTTY);
         if (fd < 0)
                 return log_error_errno(errno, "Error opening device \"%s\": %m", devnode);

         return fd;
 }

 static int builtin_keyboard(struct udev_device *dev, int argc, char *argv[], bool test) {
         struct udev_list_entry *entry;
         unsigned release[1024];
         unsigned release_count = 0;
         _cleanup_close_ int fd = -1;
         const char *node;
         int has_abs = -1;

         node = udev_device_get_devnode(dev);
         if (!node) {
                 log_error("No device node for \"%s\"", udev_device_get_syspath(dev));
                 return EXIT_FAILURE;
         }

         udev_list_entry_foreach(entry, udev_device_get_properties_list_entry(dev)) {
                 const char *key;
                 char *endptr;

                 key = udev_list_entry_get_name(entry);
                 if (startswith(key, "KEYBOARD_KEY_")) {
                         const char *keycode;
                         unsigned scancode;

                         /* KEYBOARD_KEY_<hex scan code>=<key identifier string> */
                         scancode = strtoul(key + 13, &endptr, 16);
                         if (endptr[0] != '\0') {
                                 log_warning("Unable to parse scan code from \"%s\"", key);
                                 continue;
                         }

                         keycode = udev_list_entry_get_value(entry);

                         /* 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 == -1) {
                                 fd = open_device(node);
                                 if (fd < 0)
                                         return EXIT_FAILURE;
                         }

                         map_keycode(fd, node, scancode, keycode);
                 } else if (startswith(key, "EVDEV_ABS_")) {
                         unsigned evcode;

                         /* EVDEV_ABS_<EV_ABS code>=<min>:<max>:<res>:<fuzz>:<flat> */
                         evcode = strtoul(key + 10, &endptr, 16);
                         if (endptr[0] != '\0') {
                                 log_warning("Unable to parse EV_ABS code from \"%s\"", key);
                                 continue;
                         }

                         if (fd == -1) {
                                 fd = open_device(node);
                                 if (fd < 0)
                                         return EXIT_FAILURE;
                         }

                         if (has_abs == -1) {
                                 unsigned long bits;
                                 int rc;

                                 rc = ioctl(fd, EVIOCGBIT(0, sizeof(bits)), &bits);
                                 if (rc < 0) {
                                         log_error_errno(errno, "Unable to EVIOCGBIT device \"%s\"", node);
                                         return EXIT_FAILURE;
                                 }

                                 has_abs = !!(bits & (1 << EV_ABS));
                                 if (!has_abs)
                                         log_warning("EVDEV_ABS override set but no EV_ABS present on device \"%s\"", node);
                         }

                         if (!has_abs)
                                 continue;

                         override_abs(fd, node, evcode, udev_list_entry_get_value(entry));
                 } else if (streq(key, "POINTINGSTICK_SENSITIVITY"))
                         set_trackpoint_sensitivity(dev, udev_list_entry_get_value(entry));
         }

         /* install list of force-release codes */
         if (release_count > 0)
                 install_force_release(dev, release, release_count);

         return EXIT_SUCCESS;
 }

 const struct udev_builtin udev_builtin_keyboard = {
         .name = "keyboard",
         .cmd = builtin_keyboard,
         .help = "Keyboard scan code to key mapping",
 };
	/* SPDX-License-Identifier: LGPL-2.1+ */
	/***
	This file is part of systemd.

	Copyright 2013 Kay Sievers <kay@vrfy.org>

	systemd is free software; you can redistribute it and/or modify it
	under the terms of the GNU Lesser General Public License as published by
	the Free Software Foundation; either version 2.1 of the License, or
	(at your option) any later version.

	systemd is distributed in the hope that it will be useful, but
	WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	Lesser General Public License for more details.

	You should have received a copy of the GNU Lesser General Public License
	along with systemd; If not, see <http://www.gnu.org/licenses/>.
	***/

	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <sys/ioctl.h>
	#include <linux/input.h>

	#include "fd-util.h"
	#include "parse-util.h"
	#include "stdio-util.h"
	#include "string-util.h"
	#include "udev.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(struct udev_device dev, const unsigned release, unsigned release_count) {
	struct udev_device *atkbd;
	const char *cur;
	char codes[4096];
	char *s;
	size_t l;
	unsigned i;
	int ret;

	assert(dev);
	assert(release);

	atkbd = udev_device_get_parent_with_subsystem_devtype(dev, "serio", NULL);
	if (!atkbd)
	return -ENODEV;

	cur = udev_device_get_sysattr_value(atkbd, "force_release");
	if (!cur)
	return -ENODEV;

	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_debug("keyboard: updating force-release list with '%s'", codes);
	ret = udev_device_set_sysattr_value(atkbd, "force_release", codes);
	if (ret < 0)
	log_error_errno(ret, "Error writing force-release attribute: %m");
	return ret;
	}

	static void map_keycode(int fd, const char devnode, int scancode, const char keycode)
	{
	struct {
	unsigned scan;
	unsigned key;
	} map;
	char *endptr;
	const struct key_name *k;
	unsigned keycode_num;

	/* 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 */
	keycode_num = strtoul(keycode, &endptr, 0);
	if (endptr[0] !='\0') {
	log_error("Unknown key identifier '%s'", keycode);
	return;
	}
	}

	map.scan = scancode;
	map.key = keycode_num;

	log_debug("keyboard: mapping scan code %d (0x%x) to key code %d (0x%x)",
	map.scan, map.scan, map.key, map.key);

	if (ioctl(fd, EVIOCSKEYCODE, &map) < 0)
	log_error_errno(errno, "Error calling EVIOCSKEYCODE on device node '%s' (scan code 0x%x, key code %d): %m", devnode, map.scan, map.key);
	}

	static inline 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 void override_abs(int fd, const char *devnode,
	unsigned evcode, const char *value) {
	struct input_absinfo absinfo;
	int rc;
	char *next;

	rc = ioctl(fd, EVIOCGABS(evcode), &absinfo);
	if (rc < 0) {
	log_error_errno(errno, "Unable to EVIOCGABS device \"%s\"", devnode);
	return;
	}

	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) {
	log_error("Unable to parse EV_ABS override '%s' for '%s'", value, devnode);
	return;
	}

	log_debug("keyboard: %x overridden with %"PRIi32"/%"PRIi32"/%"PRIi32"/%"PRIi32"/%"PRIi32" for \"%s\"",
	evcode,
	absinfo.minimum, absinfo.maximum, absinfo.resolution, absinfo.fuzz, absinfo.flat,
	devnode);
	rc = ioctl(fd, EVIOCSABS(evcode), &absinfo);
	if (rc < 0)
	log_error_errno(errno, "Unable to EVIOCSABS device \"%s\"", devnode);
	}

	static void set_trackpoint_sensitivity(struct udev_device dev, const char value)
	{
	struct udev_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 */
	pdev = udev_device_get_parent_with_subsystem_devtype(dev, "serio", NULL);
	if (!pdev) {
	log_warning("Failed to get serio parent for '%s'", udev_device_get_devnode(dev));
	return;
	}

	r = safe_atoi(value, &val_i);
	if (r < 0) {
	log_error("Unable to parse POINTINGSTICK_SENSITIVITY '%s' for '%s'", value, udev_device_get_devnode(dev));
	return;
	} else if (val_i < 0 \|\| val_i > 255) {
	log_error("POINTINGSTICK_SENSITIVITY %d outside range [0..255] for '%s' ", val_i, udev_device_get_devnode(dev));
	return;
	}

	xsprintf(val_s, "%d", val_i);

	r = udev_device_set_sysattr_value(pdev, "sensitivity", val_s);
	if (r < 0)
	log_error_errno(r, "Failed to write 'sensitivity' attribute for '%s': %m", udev_device_get_devnode(pdev));
	}

	static int open_device(const char *devnode) {
	int fd;

	fd = open(devnode, O_RDWR\|O_CLOEXEC\|O_NONBLOCK\|O_NOCTTY);
	if (fd < 0)
	return log_error_errno(errno, "Error opening device \"%s\": %m", devnode);

	return fd;
	}

	static int builtin_keyboard(struct udev_device dev, int argc, char argv[], bool test) {
	struct udev_list_entry *entry;
	unsigned release[1024];
	unsigned release_count = 0;
	_cleanup_close_ int fd = -1;
	const char *node;
	int has_abs = -1;

	node = udev_device_get_devnode(dev);
	if (!node) {
	log_error("No device node for \"%s\"", udev_device_get_syspath(dev));
	return EXIT_FAILURE;
	}

	udev_list_entry_foreach(entry, udev_device_get_properties_list_entry(dev)) {
	const char *key;
	char *endptr;

	key = udev_list_entry_get_name(entry);
	if (startswith(key, "KEYBOARD_KEY_")) {
	const char *keycode;
	unsigned scancode;

	/* KEYBOARD_KEY_<hex scan code>=<key identifier string> */
	scancode = strtoul(key + 13, &endptr, 16);
	if (endptr[0] != '\0') {
	log_warning("Unable to parse scan code from \"%s\"", key);
	continue;
	}

	keycode = udev_list_entry_get_value(entry);

	/* 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 == -1) {
	fd = open_device(node);
	if (fd < 0)
	return EXIT_FAILURE;
	}

	map_keycode(fd, node, scancode, keycode);
	} else if (startswith(key, "EVDEV_ABS_")) {
	unsigned evcode;

	/* EVDEV_ABS_<EV_ABS code>=<min>:<max>:<res>:<fuzz>:<flat> */
	evcode = strtoul(key + 10, &endptr, 16);
	if (endptr[0] != '\0') {
	log_warning("Unable to parse EV_ABS code from \"%s\"", key);
	continue;
	}

	if (fd == -1) {
	fd = open_device(node);
	if (fd < 0)
	return EXIT_FAILURE;
	}

	if (has_abs == -1) {
	unsigned long bits;
	int rc;

	rc = ioctl(fd, EVIOCGBIT(0, sizeof(bits)), &bits);
	if (rc < 0) {
	log_error_errno(errno, "Unable to EVIOCGBIT device \"%s\"", node);
	return EXIT_FAILURE;
	}

	has_abs = !!(bits & (1 << EV_ABS));
	if (!has_abs)
	log_warning("EVDEV_ABS override set but no EV_ABS present on device \"%s\"", node);
	}

	if (!has_abs)
	continue;

	override_abs(fd, node, evcode, udev_list_entry_get_value(entry));
	} else if (streq(key, "POINTINGSTICK_SENSITIVITY"))
	set_trackpoint_sensitivity(dev, udev_list_entry_get_value(entry));
	}

	/* install list of force-release codes */
	if (release_count > 0)
	install_force_release(dev, release, release_count);

	return EXIT_SUCCESS;
	}

	const struct udev_builtin udev_builtin_keyboard = {
	.name = "keyboard",
	.cmd = builtin_keyboard,
	.help = "Keyboard scan code to key mapping",
	};