arch/i386/kernel/dmi_scan.c

   1 #include <linux/types.h>
   2 #include <linux/kernel.h>
   3 #include <linux/string.h>
   4 #include <linux/init.h>
   5 #include <linux/module.h>
   6 #include <linux/slab.h>
   7 #include <linux/acpi.h>
   8 #include <asm/io.h>
   9 #include <linux/pm.h>
  10 #include <asm/system.h>
  11 #include <linux/dmi.h>
  12 #include <linux/bootmem.h>
  13
  14
  15 struct dmi_header
  16 {
  17         u8      type;
  18         u8      length;
  19         u16     handle;
  20 };
  21
  22 #undef DMI_DEBUG
  23
  24 #ifdef DMI_DEBUG
  25 #define dmi_printk(x) printk x
  26 #else
  27 #define dmi_printk(x)
  28 #endif
  29
  30 static char * __init dmi_string(struct dmi_header *dm, u8 s)
  31 {
  32         u8 *bp=(u8 *)dm;
  33         bp+=dm->length;
  34         if(!s)
  35                 return "";
  36         s--;
  37         while(s>0 && *bp)
  38         {
  39                 bp+=strlen(bp);
  40                 bp++;
  41                 s--;
  42         }
  43         return bp;
  44 }
  45
  46 /*
  47  *      We have to be cautious here. We have seen BIOSes with DMI pointers
  48  *      pointing to completely the wrong place for example
  49  */
  50
  51 static int __init dmi_table(u32 base, int len, int num, void (*decode)(struct dmi_header *))
  52 {
  53         u8 *buf;
  54         struct dmi_header *dm;
  55         u8 *data;
  56         int i=0;
  57
  58         buf = bt_ioremap(base, len);
  59         if(buf==NULL)
  60                 return -1;
  61
  62         data = buf;
  63
  64         /*
  65          *      Stop when we see all the items the table claimed to have
  66          *      OR we run off the end of the table (also happens)
  67          */
  68
  69         while(i<num && data-buf+sizeof(struct dmi_header)<=len)
  70         {
  71                 dm=(struct dmi_header *)data;
  72                 /*
  73                  *  We want to know the total length (formated area and strings)
  74                  *  before decoding to make sure we won't run off the table in
  75                  *  dmi_decode or dmi_string
  76                  */
  77                 data+=dm->length;
  78                 while(data-buf<len-1 && (data[0] || data[1]))
  79                         data++;
  80                 if(data-buf<len-1)
  81                         decode(dm);
  82                 data+=2;
  83                 i++;
  84         }
  85         bt_iounmap(buf, len);
  86         return 0;
  87 }
  88
  89
  90 inline static int __init dmi_checksum(u8 *buf)
  91 {
  92         u8 sum=0;
  93         int a;
  94
  95         for(a=0; a<15; a++)
  96                 sum+=buf[a];
  97         return (sum==0);
  98 }
  99
 100 static int __init dmi_iterate(void (*decode)(struct dmi_header *))
 101 {
 102         u8 buf[15];
 103         char __iomem *p, *q;
 104
 105         /*
 106          * no iounmap() for that ioremap(); it would be a no-op, but it's
 107          * so early in setup that sucker gets confused into doing what
 108          * it shouldn't if we actually call it.
 109          */
 110         p = ioremap(0xF0000, 0x10000);
 111         if (p == NULL)
 112                 return -1;
 113         for (q = p; q < p + 0x10000; q += 16) {
 114                 memcpy_fromio(buf, q, 15);
 115                 if(memcmp(buf, "_DMI_", 5)==0 && dmi_checksum(buf))
 116                 {
 117                         u16 num=buf[13]<<8|buf[12];
 118                         u16 len=buf[7]<<8|buf[6];
 119                         u32 base=buf[11]<<24|buf[10]<<16|buf[9]<<8|buf[8];
 120
 121                         /*
 122                          * DMI version 0.0 means that the real version is taken from
 123                          * the SMBIOS version, which we don't know at this point.
 124                          */
 125                         if(buf[14]!=0)
 126                                 printk(KERN_INFO "DMI %d.%d present.\n",
 127                                         buf[14]>>4, buf[14]&0x0F);
 128                         else
 129                                 printk(KERN_INFO "DMI present.\n");
 130                         dmi_printk((KERN_INFO "%d structures occupying %d bytes.\n",
 131                                 num, len));
 132                         dmi_printk((KERN_INFO "DMI table at 0x%08X.\n",
 133                                 base));
 134                         if(dmi_table(base,len, num, decode)==0)
 135                                 return 0;
 136                 }
 137         }
 138         return -1;
 139 }
 140
 141 static char *dmi_ident[DMI_STRING_MAX];
 142
 143 /*
 144  *      Save a DMI string
 145  */
 146
 147 static void __init dmi_save_ident(struct dmi_header *dm, int slot, int string)
 148 {
 149         char *d = (char*)dm;
 150         char *p = dmi_string(dm, d[string]);
 151         if(p==NULL || *p == 0)
 152                 return;
 153         if (dmi_ident[slot])
 154                 return;
 155         dmi_ident[slot] = alloc_bootmem(strlen(p)+1);
 156         if(dmi_ident[slot])
 157                 strcpy(dmi_ident[slot], p);
 158         else
 159                 printk(KERN_ERR "dmi_save_ident: out of memory.\n");
 160 }
 161
 162 /*
 163  * Ugly compatibility crap.
 164  */
 165 #define dmi_blacklist   dmi_system_id
 166 #define NO_MATCH        { DMI_NONE, NULL}
 167 #define MATCH           DMI_MATCH
 168
 169 /*
 170  * Toshiba keyboard likes to repeat keys when they are not repeated.
 171  */
 172
 173 static __init int broken_toshiba_keyboard(struct dmi_blacklist *d)
 174 {
 175         printk(KERN_WARNING "Toshiba with broken keyboard detected. If your keyboard sometimes generates 3 keypresses instead of one, see http://davyd.ucc.asn.au/projects/toshiba/README\n");
 176         return 0;
 177 }
 178
 179
 180
 181 /*
 182  *      Process the DMI blacklists
 183  */
 184
 185
 186 /*
 187  *      This will be expanded over time to force things like the APM
 188  *      interrupt mask settings according to the laptop
 189  */
 190
 191 static __initdata struct dmi_blacklist dmi_blacklist[]={
 192
 193         { broken_toshiba_keyboard, "Toshiba Satellite 4030cdt", { /* Keyboard generates spurious repeats */
 194                         MATCH(DMI_PRODUCT_NAME, "S4030CDT/4.3"),
 195                         NO_MATCH, NO_MATCH, NO_MATCH
 196                         } },
 197
 198         { NULL, }
 199 };
 200
 201 /*
 202  *      Process a DMI table entry. Right now all we care about are the BIOS
 203  *      and machine entries. For 2.5 we should pull the smbus controller info
 204  *      out of here.
 205  */
 206
 207 static void __init dmi_decode(struct dmi_header *dm)
 208 {
 209 #ifdef DMI_DEBUG
 210         u8 *data = (u8 *)dm;
 211 #endif
 212
 213         switch(dm->type)
 214         {
 215                 case  0:
 216                         dmi_printk(("BIOS Vendor: %s\n",
 217                                 dmi_string(dm, data[4])));
 218                         dmi_save_ident(dm, DMI_BIOS_VENDOR, 4);
 219                         dmi_printk(("BIOS Version: %s\n",
 220                                 dmi_string(dm, data[5])));
 221                         dmi_save_ident(dm, DMI_BIOS_VERSION, 5);
 222                         dmi_printk(("BIOS Release: %s\n",
 223                                 dmi_string(dm, data[8])));
 224                         dmi_save_ident(dm, DMI_BIOS_DATE, 8);
 225                         break;
 226                 case 1:
 227                         dmi_printk(("System Vendor: %s\n",
 228                                 dmi_string(dm, data[4])));
 229                         dmi_save_ident(dm, DMI_SYS_VENDOR, 4);
 230                         dmi_printk(("Product Name: %s\n",
 231                                 dmi_string(dm, data[5])));
 232                         dmi_save_ident(dm, DMI_PRODUCT_NAME, 5);
 233                         dmi_printk(("Version: %s\n",
 234                                 dmi_string(dm, data[6])));
 235                         dmi_save_ident(dm, DMI_PRODUCT_VERSION, 6);
 236                         dmi_printk(("Serial Number: %s\n",
 237                                 dmi_string(dm, data[7])));
 238                         dmi_save_ident(dm, DMI_PRODUCT_SERIAL, 7);
 239                         break;
 240                 case 2:
 241                         dmi_printk(("Board Vendor: %s\n",
 242                                 dmi_string(dm, data[4])));
 243                         dmi_save_ident(dm, DMI_BOARD_VENDOR, 4);
 244                         dmi_printk(("Board Name: %s\n",
 245                                 dmi_string(dm, data[5])));
 246                         dmi_save_ident(dm, DMI_BOARD_NAME, 5);
 247                         dmi_printk(("Board Version: %s\n",
 248                                 dmi_string(dm, data[6])));
 249                         dmi_save_ident(dm, DMI_BOARD_VERSION, 6);
 250                         break;
 251         }
 252 }
 253
 254 void __init dmi_scan_machine(void)
 255 {
 256         int err = dmi_iterate(dmi_decode);
 257         if(err == 0)
 258                 dmi_check_system(dmi_blacklist);
 259         else
 260                 printk(KERN_INFO "DMI not present.\n");
 261 }
 262
 263
 264 /**
 265  *      dmi_check_system - check system DMI data
 266  *      @list: array of dmi_system_id structures to match against
 267  *
 268  *      Walk the blacklist table running matching functions until someone
 269  *      returns non zero or we hit the end. Callback function is called for
 270  *      each successfull match. Returns the number of matches.
 271  */
 272 int dmi_check_system(struct dmi_system_id *list)
 273 {
 274         int i, count = 0;
 275         struct dmi_system_id *d = list;
 276
 277         while (d->ident) {
 278                 for (i = 0; i < ARRAY_SIZE(d->matches); i++) {
 279                         int s = d->matches[i].slot;
 280                         if (s == DMI_NONE)
 281                                 continue;
 282                         if (dmi_ident[s] && strstr(dmi_ident[s], d->matches[i].substr))
 283                                 continue;
 284                         /* No match */
 285                         goto fail;
 286                 }
 287                 if (d->callback && d->callback(d))
 288                         break;
 289                 count++;
 290 fail:           d++;
 291         }
 292
 293         return count;
 294 }
 295 EXPORT_SYMBOL(dmi_check_system);
 296
 297 /**
 298  *      dmi_get_system_info - return DMI data value
 299  *      @field: data index (see enum dmi_filed)
 300  *
 301  *      Returns one DMI data value, can be used to perform
 302  *      complex DMI data checks.
 303  */
 304 char *dmi_get_system_info(int field)
 305 {
 306         return dmi_ident[field];
 307 }
 308 EXPORT_SYMBOL(dmi_get_system_info);