Documentation/userspace-api/media/rc/keytable.c.rst

   1 .. SPDX-License-Identifier: GPL-2.0 OR GFDL-1.1-no-invariants-or-later
   2
   3 file: uapi/v4l/keytable.c
   4 =========================
   5
   6 .. code-block:: c
   7
   8     /* keytable.c - This program allows checking/replacing keys at IR
   9
  10        Copyright (C) 2006-2009 Mauro Carvalho Chehab <mchehab@kernel.org>
  11
  12        This program is free software; you can redistribute it and/or modify
  13        it under the terms of the GNU General Public License as published by
  14        the Free Software Foundation, version 2 of the License.
  15
  16        This program is distributed in the hope that it will be useful,
  17        but WITHOUT ANY WARRANTY; without even the implied warranty of
  18        MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19        GNU General Public License for more details.
  20      */
  21
  22     #include <ctype.h>
  23     #include <errno.h>
  24     #include <fcntl.h>
  25     #include <stdio.h>
  26     #include <stdlib.h>
  27     #include <string.h>
  28     #include <linux/input.h>
  29     #include <sys/ioctl.h>
  30
  31     #include "parse.h"
  32
  33     void prtcode (int *codes)
  34     {
  35             struct parse_key *p;
  36
  37             for (p=keynames;p->name!=NULL;p++) {
  38                     if (p->value == (unsigned)codes[1]) {
  39                             printf("scancode 0x%04x = %s (0x%02x)\\n", codes[0], p->name, codes[1]);
  40                             return;
  41                     }
  42             }
  43
  44             if (isprint (codes[1]))
  45                     printf("scancode %d = '%c' (0x%02x)\\n", codes[0], codes[1], codes[1]);
  46             else
  47                     printf("scancode %d = 0x%02x\\n", codes[0], codes[1]);
  48     }
  49
  50     int parse_code(char *string)
  51     {
  52             struct parse_key *p;
  53
  54             for (p=keynames;p->name!=NULL;p++) {
  55                     if (!strcasecmp(p->name, string)) {
  56                             return p->value;
  57                     }
  58             }
  59             return -1;
  60     }
  61
  62     int main (int argc, char *argv[])
  63     {
  64             int fd;
  65             unsigned int i, j;
  66             int codes[2];
  67
  68             if (argc<2 || argc>4) {
  69                     printf ("usage: %s <device> to get table; or\\n"
  70                             "       %s <device> <scancode> <keycode>\\n"
  71                             "       %s <device> <keycode_file>n",*argv,*argv,*argv);
  72                     return -1;
  73             }
  74
  75             if ((fd = open(argv[1], O_RDONLY)) < 0) {
  76                     perror("Couldn't open input device");
  77                     return(-1);
  78             }
  79
  80             if (argc==4) {
  81                     int value;
  82
  83                     value=parse_code(argv[3]);
  84
  85                     if (value==-1) {
  86                             value = strtol(argv[3], NULL, 0);
  87                             if (errno)
  88                                     perror("value");
  89                     }
  90
  91                     codes [0] = (unsigned) strtol(argv[2], NULL, 0);
  92                     codes [1] = (unsigned) value;
  93
  94                     if(ioctl(fd, EVIOCSKEYCODE, codes))
  95                             perror ("EVIOCSKEYCODE");
  96
  97                     if(ioctl(fd, EVIOCGKEYCODE, codes)==0)
  98                             prtcode(codes);
  99                     return 0;
 100             }
 101
 102             if (argc==3) {
 103                     FILE *fin;
 104                     int value;
 105                     char *scancode, *keycode, s[2048];
 106
 107                     fin=fopen(argv[2],"r");
 108                     if (fin==NULL) {
 109                             perror ("opening keycode file");
 110                             return -1;
 111                     }
 112
 113                     /* Clears old table */
 114                     for (j = 0; j < 256; j++) {
 115                             for (i = 0; i < 256; i++) {
 116                                     codes[0] = (j << 8) | i;
 117                                     codes[1] = KEY_RESERVED;
 118                                     ioctl(fd, EVIOCSKEYCODE, codes);
 119                             }
 120                     }
 121
 122                     while (fgets(s,sizeof(s),fin)) {
 123                             scancode=strtok(s,"\\n\\t =:");
 124                             if (!scancode) {
 125                                     perror ("parsing input file scancode");
 126                                     return -1;
 127                             }
 128                             if (!strcasecmp(scancode, "scancode")) {
 129                                     scancode = strtok(NULL,"\\n\\t =:");
 130                                     if (!scancode) {
 131                                             perror ("parsing input file scancode");
 132                                             return -1;
 133                                     }
 134                             }
 135
 136                             keycode=strtok(NULL,"\\n\\t =:(");
 137                             if (!keycode) {
 138                                     perror ("parsing input file keycode");
 139                                     return -1;
 140                             }
 141
 142                             // printf ("parsing %s=%s:", scancode, keycode);
 143                             value=parse_code(keycode);
 144                             // printf ("\\tvalue=%d\\n",value);
 145
 146                             if (value==-1) {
 147                                     value = strtol(keycode, NULL, 0);
 148                                     if (errno)
 149                                             perror("value");
 150                             }
 151
 152                             codes [0] = (unsigned) strtol(scancode, NULL, 0);
 153                             codes [1] = (unsigned) value;
 154
 155                             // printf("\\t%04x=%04x\\n",codes[0], codes[1]);
 156                             if(ioctl(fd, EVIOCSKEYCODE, codes)) {
 157                                     fprintf(stderr, "Setting scancode 0x%04x with 0x%04x via ",codes[0], codes[1]);
 158                                     perror ("EVIOCSKEYCODE");
 159                             }
 160
 161                             if(ioctl(fd, EVIOCGKEYCODE, codes)==0)
 162                                     prtcode(codes);
 163                     }
 164                     return 0;
 165             }
 166
 167             /* Get scancode table */
 168             for (j = 0; j < 256; j++) {
 169                     for (i = 0; i < 256; i++) {
 170                             codes[0] = (j << 8) | i;
 171                             if (!ioctl(fd, EVIOCGKEYCODE, codes) && codes[1] != KEY_RESERVED)
 172                                     prtcode(codes);
 173                     }
 174             }
 175             return 0;
 176     }