lib/names.c

   1 /*
   2  *      $Id: names.c,v 1.6 2000/04/29 12:56:23 mj Exp $
   3  *
   4  *      The PCI Library -- ID to Name Translation
   5  *
   6  *      Copyright (c) 1997--2000 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
   7  *
   8  *      Can be freely distributed and used under the terms of the GNU GPL.
   9  */
  10
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <string.h>
  14 #include <fcntl.h>
  15 #include <unistd.h>
  16 #include <sys/stat.h>
  17 #include <errno.h>
  18
  19 #include "internal.h"
  20
  21 struct nl_entry {
  22   struct nl_entry *next;
  23   word id1, id2, id3, id4;
  24   int cat;
  25   byte *name;
  26 };
  27
  28 #define NL_VENDOR 0
  29 #define NL_DEVICE 1
  30 #define NL_SUBSYSTEM 2
  31 #define NL_CLASS 3
  32 #define NL_SUBCLASS 4
  33 #define NL_PROGIF 5
  34
  35 #define HASH_SIZE 1024
  36
  37 static inline unsigned int nl_calc_hash(int cat, int id1, int id2, int id3, int id4)
  38 {
  39   unsigned int h;
  40
  41   h = id1 ^ id2 ^ id3 ^ id4 ^ (cat << 5);
  42   h += (h >> 6);
  43   return h & (HASH_SIZE-1);
  44 }
  45
  46 static struct nl_entry *nl_lookup(struct pci_access *a, int num, int cat, int id1, int id2, int id3, int id4)
  47 {
  48   unsigned int h;
  49   struct nl_entry *n;
  50
  51   if (num)
  52     return NULL;
  53   h = nl_calc_hash(cat, id1, id2, id3, id4);
  54   n = a->nl_hash[h];
  55   while (n && (n->id1 != id1 || n->id2 != id2 || n->id3 != id3 || n->id4 != id4 || n->cat != cat))
  56     n = n->next;
  57   return n;
  58 }
  59
  60 static int nl_add(struct pci_access *a, int cat, int id1, int id2, int id3, int id4, byte *text)
  61 {
  62   unsigned int h = nl_calc_hash(cat, id1, id2, id3, id4);
  63   struct nl_entry *n = a->nl_hash[h];
  64
  65   while (n && (n->id1 != id1 || n->id2 != id2 || n->id3 != id3 || n->id4 != id4 || n->cat != cat))
  66     n = n->next;
  67   if (n)
  68     return 1;
  69   n = pci_malloc(a, sizeof(struct nl_entry));
  70   n->id1 = id1;
  71   n->id2 = id2;
  72   n->id3 = id3;
  73   n->id4 = id4;
  74   n->cat = cat;
  75   n->name = text;
  76   n->next = a->nl_hash[h];
  77   a->nl_hash[h] = n;
  78   return 0;
  79 }
  80
  81 static void
  82 err_name_list(struct pci_access *a, char *msg)
  83 {
  84   a->error("%s: %s: %s\n", a->id_file_name, msg, strerror(errno));
  85 }
  86
  87 static void
  88 parse_name_list(struct pci_access *a)
  89 {
  90   byte *p = a->nl_list;
  91   byte *q, *r;
  92   int lino = 0;
  93   unsigned int id1=0, id2=0, id3=0, id4=0;
  94   int cat = -1;
  95
  96   while (*p)
  97     {
  98       lino++;
  99       q = p;
 100       while (*p && *p != '\n')
 101         {
 102           if (*p == '#')
 103             {
 104               *p++ = 0;
 105               while (*p && *p != '\n')
 106                 p++;
 107               break;
 108             }
 109           p++;
 110         }
 111       if (*p == '\n')
 112         *p++ = 0;
 113       if (!*q)
 114         continue;
 115       r = p;
 116       while (r > q && r[-1] == ' ')
 117         *--r = 0;
 118       r = q;
 119       while (*q == '\t')
 120         q++;
 121       if (q == r)
 122         {
 123           if (q[0] == 'C' && q[1] == ' ')
 124             {
 125               if (strlen(q+2) < 3 ||
 126                   q[4] != ' ' ||
 127                   sscanf(q+2, "%x", &id1) != 1)
 128                 goto parserr;
 129               cat = NL_CLASS;
 130             }
 131           else
 132             {
 133               if (strlen(q) < 5 ||
 134                   q[4] != ' ' ||
 135                   sscanf(q, "%x", &id1) != 1)
 136                 goto parserr;
 137               cat = NL_VENDOR;
 138             }
 139           id2 = id3 = id4 = 0;
 140           q += 4;
 141         }
 142       else if (q == r+1)
 143         switch (cat)
 144           {
 145           case NL_VENDOR:
 146           case NL_DEVICE:
 147           case NL_SUBSYSTEM:
 148             if (sscanf(q, "%x", &id2) != 1 || q[4] != ' ')
 149               goto parserr;
 150             q += 5;
 151             cat = NL_DEVICE;
 152             id3 = id4 = 0;
 153             break;
 154           case NL_CLASS:
 155           case NL_SUBCLASS:
 156           case NL_PROGIF:
 157             if (sscanf(q, "%x", &id2) != 1 || q[2] != ' ')
 158               goto parserr;
 159             q += 3;
 160             cat = NL_SUBCLASS;
 161             id3 = id4 = 0;
 162             break;
 163           default:
 164             goto parserr;
 165           }
 166       else if (q == r+2)
 167         switch (cat)
 168           {
 169           case NL_DEVICE:
 170           case NL_SUBSYSTEM:
 171             if (sscanf(q, "%x%x", &id3, &id4) != 2 || q[9] != ' ')
 172               goto parserr;
 173             q += 10;
 174             cat = NL_SUBSYSTEM;
 175             break;
 176           case NL_CLASS:
 177           case NL_SUBCLASS:
 178           case NL_PROGIF:
 179             if (sscanf(q, "%x", &id3) != 1 || q[2] != ' ')
 180               goto parserr;
 181             q += 3;
 182             cat = NL_PROGIF;
 183             id4 = 0;
 184             break;
 185           default:
 186             goto parserr;
 187           }
 188       else
 189         goto parserr;
 190       while (*q == ' ')
 191         q++;
 192       if (!*q)
 193         goto parserr;
 194       if (nl_add(a, cat, id1, id2, id3, id4, q))
 195         a->error("%s, line %d: duplicate entry", a->id_file_name, lino);
 196     }
 197   return;
 198
 199 parserr:
 200   a->error("%s, line %d: parse error", a->id_file_name, lino);
 201 }
 202
 203 static void
 204 load_name_list(struct pci_access *a)
 205 {
 206   int fd;
 207   struct stat st;
 208
 209   fd = open(a->id_file_name, O_RDONLY);
 210   if (fd < 0)
 211     {
 212       a->numeric_ids = 1;
 213       return;
 214     }
 215   if (fstat(fd, &st) < 0)
 216     err_name_list(a, "stat");
 217   a->nl_list = pci_malloc(a, st.st_size + 1);
 218   if (read(fd, a->nl_list, st.st_size) != st.st_size)
 219     err_name_list(a, "read");
 220   a->nl_list[st.st_size] = 0;
 221   a->nl_hash = pci_malloc(a, sizeof(struct nl_entry *) * HASH_SIZE);
 222   bzero(a->nl_hash, sizeof(struct nl_entry *) * HASH_SIZE);
 223   parse_name_list(a);
 224   close(fd);
 225 }
 226
 227 void
 228 pci_free_name_list(struct pci_access *a)
 229 {
 230   pci_mfree(a->nl_list);
 231   a->nl_list = NULL;
 232   pci_mfree(a->nl_hash);
 233   a->nl_hash = NULL;
 234 }
 235
 236 char *
 237 pci_lookup_name(struct pci_access *a, char *buf, int size, int flags, u32 arg1, u32 arg2, u32 arg3, u32 arg4)
 238 {
 239   int num = a->numeric_ids;
 240   int res;
 241   struct nl_entry *n;
 242
 243   if (flags & PCI_LOOKUP_NUMERIC)
 244     {
 245       flags &= PCI_LOOKUP_NUMERIC;
 246       num = 1;
 247     }
 248   if (!a->nl_hash && !num)
 249     {
 250       load_name_list(a);
 251       num = a->numeric_ids;
 252     }
 253   switch (flags)
 254     {
 255     case PCI_LOOKUP_VENDOR:
 256       if (n = nl_lookup(a, num, NL_VENDOR, arg1, 0, 0, 0))
 257         return n->name;
 258       else
 259         res = snprintf(buf, size, "%04x", arg1);
 260       break;
 261     case PCI_LOOKUP_DEVICE:
 262       if (n = nl_lookup(a, num, NL_DEVICE, arg1, arg2, 0, 0))
 263         return n->name;
 264       else
 265         res = snprintf(buf, size, "%04x", arg2);
 266       break;
 267     case PCI_LOOKUP_VENDOR | PCI_LOOKUP_DEVICE:
 268       if (!num)
 269         {
 270           struct nl_entry *e, *e2;
 271           e = nl_lookup(a, 0, NL_VENDOR, arg1, 0, 0, 0);
 272           e2 = nl_lookup(a, 0, NL_DEVICE, arg1, arg2, 0, 0);
 273           if (!e)
 274             res = snprintf(buf, size, "Unknown device %04x:%04x", arg1, arg2);
 275           else if (!e2)
 276             res = snprintf(buf, size, "%s: Unknown device %04x", e->name, arg2);
 277           else
 278             res = snprintf(buf, size, "%s %s", e->name, e2->name);
 279         }
 280       else
 281         res = snprintf(buf, size, "%04x:%04x", arg1, arg2);
 282       break;
 283     case PCI_LOOKUP_VENDOR | PCI_LOOKUP_SUBSYSTEM:
 284       if (n = nl_lookup(a, num, NL_VENDOR, arg3, 0, 0, 0))
 285         return n->name;
 286       else
 287         res = snprintf(buf, size, "%04x", arg1);
 288       break;
 289     case PCI_LOOKUP_DEVICE | PCI_LOOKUP_SUBSYSTEM:
 290       if (n = nl_lookup(a, num, NL_SUBSYSTEM, arg1, arg2, arg3, arg4))
 291         return n->name;
 292       else if (arg1 == arg3 && arg2 == arg4 && (n = nl_lookup(a, num, NL_DEVICE, arg1, arg2, 0, 0)))
 293         return n->name;
 294       else
 295         res = snprintf(buf, size, "%04x", arg2);
 296       break;
 297     case PCI_LOOKUP_VENDOR | PCI_LOOKUP_DEVICE | PCI_LOOKUP_SUBSYSTEM:
 298       if (!num)
 299         {
 300           struct nl_entry *e, *e2;
 301           e = nl_lookup(a, 0, NL_VENDOR, arg3, 0, 0, 0);
 302           e2 = nl_lookup(a, 0, NL_SUBSYSTEM, arg1, arg2, arg3, arg4);
 303           if (!e2 && arg1 == arg3 && arg2 == arg4)
 304             /* Cheat for vendors blindly setting subsystem ID same as device ID */
 305             e2 = nl_lookup(a, 0, NL_DEVICE, arg1, arg2, 0, 0);
 306           if (!e)
 307             res = snprintf(buf, size, "Unknown device %04x:%04x", arg3, arg4);
 308           else if (!e2)
 309             res = snprintf(buf, size, "%s: Unknown device %04x", e->name, arg4);
 310           else
 311             res = snprintf(buf, size, "%s %s", e->name, e2->name);
 312         }
 313       else
 314         res = snprintf(buf, size, "%04x:%04x", arg3, arg4);
 315       break;
 316     case PCI_LOOKUP_CLASS:
 317       if (n = nl_lookup(a, num, NL_SUBCLASS, arg1 >> 8, arg1 & 0xff, 0, 0))
 318         return n->name;
 319       else if (n = nl_lookup(a, num, NL_CLASS, arg1, 0, 0, 0))
 320         res = snprintf(buf, size, "%s [%04x]", n->name, arg1);
 321       else
 322         res = snprintf(buf, size, "Class %04x", arg1);
 323       break;
 324     case PCI_LOOKUP_PROGIF:
 325       if (n = nl_lookup(a, num, NL_PROGIF, arg1 >> 8, arg1 & 0xff, arg2, 0))
 326         return n->name;
 327       if (arg1 == 0x0101)
 328         {
 329           /* IDE controllers have complex prog-if semantics */
 330           if (arg2 & 0x70)
 331             return NULL;
 332           res = snprintf(buf, size, "%s%s%s%s%s",
 333                          (arg2 & 0x80) ? "Master " : "",
 334                          (arg2 & 0x08) ? "SecP " : "",
 335                          (arg2 & 0x04) ? "SecO " : "",
 336                          (arg2 & 0x02) ? "PriP " : "",
 337                          (arg2 & 0x01) ? "PriO " : "");
 338           if (res)
 339             buf[--res] = 0;
 340           break;
 341         }
 342       return NULL;
 343     default:
 344       return "<pci_lookup_name: invalid request>";
 345     }
 346   return (res == size) ? "<too-large>" : buf;
 347 }