1 /* 2 * Copyright © 2015 Red Hat, Inc. 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice (including the next 12 * paragraph) shall be included in all copies or substantial portions of the 13 * Software. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 21 * DEALINGS IN THE SOFTWARE. 22 */ 23 24 #include "config.h" 25 26 #include <fcntl.h> 27 #include <stdio.h> 28 #include <stdint.h> 29 #include <unistd.h> 30 #include <libudev.h> 31 #include <linux/input.h> 32 #include <libevdev/libevdev.h> 33 34 #include "util-prop-parsers.h" 35 #include "util-macros.h" 36 37 /** 38 * For a non-zero fuzz on the x/y axes, print that fuzz as property and 39 * reset the kernel's fuzz to 0. 40 * https://bugs.freedesktop.org/show_bug.cgi?id=105202 41 */ 42 static void handle_absfuzz(struct udev_device * device)43 handle_absfuzz(struct udev_device *device) 44 { 45 const char *devnode; 46 struct libevdev *evdev = NULL; 47 int fd = -1; 48 int rc; 49 unsigned int *code; 50 unsigned int axes[] = {ABS_X, 51 ABS_Y, 52 ABS_MT_POSITION_X, 53 ABS_MT_POSITION_Y}; 54 55 devnode = udev_device_get_devnode(device); 56 if (!devnode) 57 goto out; 58 59 fd = open(devnode, O_RDONLY); 60 if (fd < 0) 61 goto out; 62 63 rc = libevdev_new_from_fd(fd, &evdev); 64 if (rc != 0) 65 goto out; 66 67 if (!libevdev_has_event_type(evdev, EV_ABS)) 68 goto out; 69 70 ARRAY_FOR_EACH(axes, code) { 71 int fuzz; 72 73 fuzz = libevdev_get_abs_fuzz(evdev, *code); 74 if (fuzz) 75 printf("LIBINPUT_FUZZ_%02x=%d\n", *code, fuzz); 76 } 77 78 out: 79 close(fd); 80 libevdev_free(evdev); 81 } 82 83 /** 84 * Where a device has EVDEV_ABS_... set with a fuzz, that fuzz hasn't been 85 * applied to the kernel yet. So we need to extract it ourselves **and** 86 * update the property so the kernel won't actually set it later. 87 */ 88 static void handle_evdev_abs(struct udev_device * device)89 handle_evdev_abs(struct udev_device *device) 90 { 91 unsigned int *code; 92 unsigned int axes[] = {ABS_X, 93 ABS_Y, 94 ABS_MT_POSITION_X, 95 ABS_MT_POSITION_Y}; 96 97 ARRAY_FOR_EACH(axes, code) { 98 const char *prop; 99 char name[64]; 100 uint32_t mask; 101 struct input_absinfo abs; 102 103 snprintf(name, sizeof(name), "EVDEV_ABS_%02X", *code); 104 prop = udev_device_get_property_value(device, name); 105 if (!prop) 106 continue; 107 108 mask = parse_evdev_abs_prop(prop, &abs); 109 if (mask & ABS_MASK_FUZZ) 110 printf("LIBINPUT_FUZZ_%02x=%d\n", *code, abs.fuzz); 111 } 112 } 113 main(int argc,char ** argv)114 int main(int argc, char **argv) 115 { 116 int rc = 1; 117 struct udev *udev = NULL; 118 struct udev_device *device = NULL; 119 const char *syspath; 120 121 if (argc != 2) 122 return 1; 123 124 syspath = argv[1]; 125 126 udev = udev_new(); 127 if (!udev) 128 goto out; 129 130 device = udev_device_new_from_syspath(udev, syspath); 131 if (!device) 132 goto out; 133 134 handle_absfuzz(device); 135 handle_evdev_abs(device); 136 137 rc = 0; 138 139 out: 140 if (device) 141 udev_device_unref(device); 142 if (udev) 143 udev_unref(udev); 144 145 return rc; 146 } 147