qemu-keymap.c

   1 /*
   2  * QEMU keymap utility
   3  *
   4  * Copyright Red Hat, Inc. 2017
   5  *
   6  * Authors:
   7  *     Gerd Hoffmann <kraxel@redhat.com>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  10  * See the COPYING file in the top-level directory.
  11  */
  12 #include "qemu/osdep.h"
  13 #include "qemu-common.h"
  14 #include "qemu/notify.h"
  15 #include "ui/input.h"
  16
  17 #include <xkbcommon/xkbcommon.h>
  18
  19 struct xkb_rule_names names = {
  20     .rules   = NULL,
  21     .model   = "pc105",
  22     .layout  = "us",
  23     .variant = NULL,
  24     .options = NULL,
  25 };
  26
  27 static xkb_mod_mask_t shift;
  28 static xkb_mod_mask_t ctrl;
  29 static xkb_mod_mask_t altgr;
  30 static xkb_mod_mask_t numlock;
  31
  32 static FILE *outfile;
  33
  34 /* ------------------------------------------------------------------------ */
  35
  36 static uint32_t qcode_to_number(uint32_t qcode)
  37 {
  38     KeyValue keyvalue;
  39     uint32_t number;
  40
  41     keyvalue.type = KEY_VALUE_KIND_QCODE;
  42     keyvalue.u.qcode.data = qcode;
  43     number = qemu_input_key_value_to_number(&keyvalue);
  44     assert(number != 0);
  45     return number;
  46 }
  47
  48 static void print_sym(xkb_keysym_t sym, uint32_t qcode, const char *mod)
  49 {
  50     char name[64];
  51
  52     if (sym == XKB_KEY_NoSymbol) {
  53         return;
  54     }
  55     xkb_keysym_get_name(sym, name, sizeof(name));
  56
  57     /* TODO: make ui/keymap.c parser accept QKeyCode names */
  58     fprintf(outfile, "%s 0x%02x%s\n", name, qcode_to_number(qcode), mod);
  59 }
  60
  61 static void walk_map(struct xkb_keymap *map, xkb_keycode_t code, void *data)
  62 {
  63     struct xkb_state *state = data;
  64     xkb_keysym_t kbase, knumlock, kshift, kaltgr, kaltgrshift;
  65     uint32_t evdev, qcode;
  66     char name[64];
  67
  68     fprintf(outfile, "\n");
  69
  70     /*
  71      * map xkb keycode -> QKeyCode
  72      *
  73      * xkb keycode is linux evdev shifted by 8
  74      */
  75     evdev = code - 8;
  76     qcode = qemu_input_linux_to_qcode(evdev);
  77     if (qcode == Q_KEY_CODE_UNMAPPED) {
  78         xkb_state_update_mask(state,  0, 0, 0,  0, 0, 0);
  79         kbase = xkb_state_key_get_one_sym(state, code);
  80         xkb_keysym_get_name(kbase, name, sizeof(name));
  81         fprintf(outfile, "# evdev %d (0x%x): no evdev -> QKeyCode mapping"
  82                 " (xkb keysym %s)\n", evdev, evdev, name);
  83         return;
  84     }
  85     fprintf(outfile, "# evdev %d (0x%x), QKeyCode \"%s\", number 0x%x\n",
  86             evdev, evdev,
  87             QKeyCode_str(qcode),
  88             qcode_to_number(qcode));
  89
  90     /*
  91      * check which modifier states generate which keysyms
  92      */
  93     xkb_state_update_mask(state,  0, 0, 0,  0, 0, 0);
  94     kbase = xkb_state_key_get_one_sym(state, code);
  95     print_sym(kbase, qcode, "");
  96
  97     xkb_state_update_mask(state,  0, 0, numlock,  0, 0, 0);
  98     knumlock = xkb_state_key_get_one_sym(state, code);
  99     if (kbase != knumlock) {
 100         print_sym(knumlock, qcode, " numlock");
 101     }
 102
 103     xkb_state_update_mask(state,  shift, 0, 0,  0, 0, 0);
 104     kshift = xkb_state_key_get_one_sym(state, code);
 105     if (kbase != kshift && knumlock != kshift) {
 106         print_sym(kshift, qcode, " shift");
 107     }
 108
 109     xkb_state_update_mask(state,  altgr, 0, 0,  0, 0, 0);
 110     kaltgr = xkb_state_key_get_one_sym(state, code);
 111     if (kbase != kaltgr) {
 112         print_sym(kaltgr, qcode, " altgr");
 113     }
 114
 115     xkb_state_update_mask(state,  altgr | shift, 0, 0,  0, 0, 0);
 116     kaltgrshift = xkb_state_key_get_one_sym(state, code);
 117     if (kshift != kaltgrshift && kaltgr != kaltgrshift) {
 118         print_sym(kaltgrshift, qcode, " shift altgr");
 119     }
 120     return;
 121 }
 122
 123 static void usage(FILE *out)
 124 {
 125     fprintf(out,
 126             "\n"
 127             "This tool generates qemu reverse keymaps from xkb keymaps,\n"
 128             "which can be used with the qemu \"-k\" command line switch.\n"
 129             "\n"
 130             "usage: qemu-keymap <options>\n"
 131             "options:\n"
 132             "    -h             print this text\n"
 133             "    -f <file>      set output file          (default: stdout)\n"
 134             "    -m <model>     set kbd model            (default: %s)\n"
 135             "    -l <layout>    set kbd layout           (default: %s)\n"
 136             "    -v <variant>   set kbd variant          (default: %s)\n"
 137             "    -o <options>   set kbd options          (default: %s)\n"
 138             "\n",
 139             names.model, names.layout,
 140             names.variant ?: "-",
 141             names.options ?: "-");
 142 }
 143
 144 int main(int argc, char *argv[])
 145 {
 146     struct xkb_context *ctx;
 147     struct xkb_keymap *map;
 148     struct xkb_state *state;
 149     xkb_mod_index_t mod, mods;
 150     int rc;
 151
 152     for (;;) {
 153         rc = getopt(argc, argv, "hm:l:v:o:f:");
 154         if (rc == -1) {
 155             break;
 156         }
 157         switch (rc) {
 158         case 'm':
 159             names.model = optarg;
 160             break;
 161         case 'l':
 162             names.layout = optarg;
 163             break;
 164         case 'v':
 165             names.variant = optarg;
 166             break;
 167         case 'o':
 168             names.options = optarg;
 169             break;
 170         case 'f':
 171             outfile = fopen(optarg, "w");
 172             if (outfile == NULL) {
 173                 fprintf(stderr, "open %s: %s\n", optarg, strerror(errno));
 174                 exit(1);
 175             }
 176             break;
 177         case 'h':
 178             usage(stdout);
 179             exit(0);
 180         default:
 181             usage(stderr);
 182             exit(1);
 183         }
 184     }
 185
 186     if (outfile == NULL) {
 187         outfile = stdout;
 188     }
 189
 190     fprintf(outfile,
 191             "#\n"
 192             "# generated by qemu-keymap\n"
 193             "#    model   : %s\n"
 194             "#    layout  : %s\n"
 195             "#    variant : %s\n"
 196             "#    options : %s\n"
 197             "\n",
 198             names.model, names.layout,
 199             names.variant ?: "-",
 200             names.options ?: "-");
 201
 202     ctx = xkb_context_new(XKB_CONTEXT_NO_FLAGS);
 203     map = xkb_keymap_new_from_names(ctx, &names, XKB_KEYMAP_COMPILE_NO_FLAGS);
 204     if (!map) {
 205         /* libxkbcommon prints error */
 206         exit(1);
 207     }
 208
 209     fprintf(outfile, "# name: \"%s\"\n\n",
 210             xkb_keymap_layout_get_name(map, 0));
 211     fprintf(outfile, "# modifiers\n");
 212     mods = xkb_keymap_num_mods(map);
 213     for (mod = 0; mod < mods; mod++) {
 214         fprintf(outfile, "#    %2d: %s\n",
 215                 mod, xkb_keymap_mod_get_name(map, mod));
 216     }
 217
 218     mod = xkb_keymap_mod_get_index(map, "Shift");
 219     shift = (1 << mod);
 220     mod = xkb_keymap_mod_get_index(map, "Control");
 221     ctrl = (1 << mod);
 222     mod = xkb_keymap_mod_get_index(map, "AltGr");
 223     altgr = (1 << mod);
 224     mod = xkb_keymap_mod_get_index(map, "NumLock");
 225     numlock = (1 << mod);
 226
 227     state = xkb_state_new(map);
 228     xkb_keymap_key_for_each(map, walk_map, state);
 229
 230     /* add quirks */
 231     fprintf(outfile,
 232             "\n"
 233             "#\n"
 234             "# quirks section start\n"
 235             "#\n"
 236             "# Sometimes multiple keysyms map to the same keycodes.\n"
 237             "# The keycode -> keysym lookup finds only one of the\n"
 238             "# keysyms.  So append them here.\n"
 239             "#\n"
 240             "\n");
 241     print_sym(XKB_KEY_Print,            Q_KEY_CODE_SYSRQ,      "");
 242     print_sym(XKB_KEY_Sys_Req,          Q_KEY_CODE_SYSRQ,      "");
 243     print_sym(XKB_KEY_Execute,          Q_KEY_CODE_SYSRQ,      "");
 244
 245     print_sym(XKB_KEY_KP_Decimal,       Q_KEY_CODE_KP_DECIMAL, " numlock");
 246     print_sym(XKB_KEY_KP_Separator,     Q_KEY_CODE_KP_DECIMAL, " numlock");
 247
 248     print_sym(XKB_KEY_Alt_R,            Q_KEY_CODE_ALT_R,      "");
 249     print_sym(XKB_KEY_ISO_Level3_Shift, Q_KEY_CODE_ALT_R,      "");
 250     print_sym(XKB_KEY_Mode_switch,      Q_KEY_CODE_ALT_R,      "");
 251
 252     fprintf(outfile,
 253             "\n"
 254             "# quirks section end\n");
 255
 256     exit(0);
 257 }