drivers/pnp/pnpbios/core.c

   1 /*
   2  * pnpbios -- PnP BIOS driver
   3  *
   4  * This driver provides access to Plug-'n'-Play services provided by
   5  * the PnP BIOS firmware, described in the following documents:
   6  *   Plug and Play BIOS Specification, Version 1.0A, 5 May 1994
   7  *   Plug and Play BIOS Clarification Paper, 6 October 1994
   8  *     Compaq Computer Corporation, Phoenix Technologies Ltd., Intel Corp.
   9  *
  10  * Originally (C) 1998 Christian Schmidt <schmidt@digadd.de>
  11  * Modifications (C) 1998 Tom Lees <tom@lpsg.demon.co.uk>
  12  * Minor reorganizations by David Hinds <dahinds@users.sourceforge.net>
  13  * Further modifications (C) 2001, 2002 by:
  14  *   Alan Cox <alan@redhat.com>
  15  *   Thomas Hood
  16  *   Brian Gerst <bgerst@didntduck.org>
  17  *
  18  * Ported to the PnP Layer and several additional improvements (C) 2002
  19  * by Adam Belay <ambx1@neo.rr.com>
  20  *
  21  * This program is free software; you can redistribute it and/or modify it
  22  * under the terms of the GNU General Public License as published by the
  23  * Free Software Foundation; either version 2, or (at your option) any
  24  * later version.
  25  *
  26  * This program is distributed in the hope that it will be useful, but
  27  * WITHOUT ANY WARRANTY; without even the implied warranty of
  28  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  29  * General Public License for more details.
  30  *
  31  * You should have received a copy of the GNU General Public License
  32  * along with this program; if not, write to the Free Software
  33  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  34  */
  35
  36 /* Change Log
  37  *
  38  * Adam Belay - <ambx1@neo.rr.com> - March 16, 2003
  39  * rev 1.01     Only call pnp_bios_dev_node_info once
  40  *              Added pnpbios_print_status
  41  *              Added several new error messages and info messages
  42  *              Added pnpbios_interface_attach_device
  43  *              integrated core and proc init system
  44  *              Introduced PNPMODE flags
  45  *              Removed some useless includes
  46  */
  47
  48 #include <linux/types.h>
  49 #include <linux/module.h>
  50 #include <linux/init.h>
  51 #include <linux/linkage.h>
  52 #include <linux/kernel.h>
  53 #include <linux/pnpbios.h>
  54 #include <linux/device.h>
  55 #include <linux/pnp.h>
  56 #include <linux/mm.h>
  57 #include <linux/smp.h>
  58 #include <linux/slab.h>
  59 #include <linux/kobject_uevent.h>
  60 #include <linux/completion.h>
  61 #include <linux/spinlock.h>
  62 #include <linux/dmi.h>
  63 #include <linux/delay.h>
  64 #include <linux/acpi.h>
  65
  66 #include <asm/page.h>
  67 #include <asm/desc.h>
  68 #include <asm/system.h>
  69 #include <asm/byteorder.h>
  70
  71 #include "pnpbios.h"
  72
  73
  74 /*
  75  *
  76  * PnP BIOS INTERFACE
  77  *
  78  */
  79
  80 static union pnp_bios_install_struct * pnp_bios_install = NULL;
  81
  82 int pnp_bios_present(void)
  83 {
  84         return (pnp_bios_install != NULL);
  85 }
  86
  87 struct pnp_dev_node_info node_info;
  88
  89 void *pnpbios_kmalloc(size_t size, int f)
  90 {
  91         void *p = kmalloc( size, f );
  92         if ( p == NULL )
  93                 printk(KERN_ERR "PnPBIOS: kmalloc() failed\n");
  94         else
  95                 memset(p, 0, size);
  96         return p;
  97 }
  98
  99 /*
 100  *
 101  * DOCKING FUNCTIONS
 102  *
 103  */
 104
 105 #ifdef CONFIG_HOTPLUG
 106
 107 static int unloading = 0;
 108 static struct completion unload_sem;
 109
 110 /*
 111  * (Much of this belongs in a shared routine somewhere)
 112  */
 113
 114 static int pnp_dock_event(int dock, struct pnp_docking_station_info *info)
 115 {
 116         char *argv [3], **envp, *buf, *scratch;
 117         int i = 0, value;
 118
 119         if (!hotplug_path [0])
 120                 return -ENOENT;
 121         if (!current->fs->root) {
 122                 return -EAGAIN;
 123         }
 124         if (!(envp = (char **) pnpbios_kmalloc (20 * sizeof (char *), GFP_KERNEL))) {
 125                 return -ENOMEM;
 126         }
 127         if (!(buf = pnpbios_kmalloc (256, GFP_KERNEL))) {
 128                 kfree (envp);
 129                 return -ENOMEM;
 130         }
 131
 132         /* only one standardized param to hotplug command: type */
 133         argv [0] = hotplug_path;
 134         argv [1] = "dock";
 135         argv [2] = NULL;
 136
 137         /* minimal command environment */
 138         envp [i++] = "HOME=/";
 139         envp [i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
 140
 141 #ifdef  DEBUG
 142         /* hint that policy agent should enter no-stdout debug mode */
 143         envp [i++] = "DEBUG=kernel";
 144 #endif
 145         /* extensible set of named bus-specific parameters,
 146          * supporting multiple driver selection algorithms.
 147          */
 148         scratch = buf;
 149
 150         /* action:  add, remove */
 151         envp [i++] = scratch;
 152         scratch += sprintf (scratch, "ACTION=%s", dock?"add":"remove") + 1;
 153
 154         /* Report the ident for the dock */
 155         envp [i++] = scratch;
 156         scratch += sprintf (scratch, "DOCK=%x/%x/%x",
 157                 info->location_id, info->serial, info->capabilities);
 158         envp[i] = NULL;
 159
 160         value = call_usermodehelper (argv [0], argv, envp, 0);
 161         kfree (buf);
 162         kfree (envp);
 163         return 0;
 164 }
 165
 166 /*
 167  * Poll the PnP docking at regular intervals
 168  */
 169 static int pnp_dock_thread(void * unused)
 170 {
 171         static struct pnp_docking_station_info now;
 172         int docked = -1, d = 0;
 173         daemonize("kpnpbiosd");
 174         allow_signal(SIGKILL);
 175         while(!unloading && !signal_pending(current))
 176         {
 177                 int status;
 178
 179                 /*
 180                  * Poll every 2 seconds
 181                  */
 182                 msleep_interruptible(2000);
 183
 184                 if(signal_pending(current)) {
 185                         if (try_to_freeze(PF_FREEZE))
 186                                 continue;
 187                         break;
 188                 }
 189
 190                 status = pnp_bios_dock_station_info(&now);
 191
 192                 switch(status)
 193                 {
 194                         /*
 195                          * No dock to manage
 196                          */
 197                         case PNP_FUNCTION_NOT_SUPPORTED:
 198                                 complete_and_exit(&unload_sem, 0);
 199                         case PNP_SYSTEM_NOT_DOCKED:
 200                                 d = 0;
 201                                 break;
 202                         case PNP_SUCCESS:
 203                                 d = 1;
 204                                 break;
 205                         default:
 206                                 pnpbios_print_status( "pnp_dock_thread", status );
 207                                 continue;
 208                 }
 209                 if(d != docked)
 210                 {
 211                         if(pnp_dock_event(d, &now)==0)
 212                         {
 213                                 docked = d;
 214 #if 0
 215                                 printk(KERN_INFO "PnPBIOS: Docking station %stached\n", docked?"at":"de");
 216 #endif
 217                         }
 218                 }
 219         }
 220         complete_and_exit(&unload_sem, 0);
 221 }
 222
 223 #endif   /* CONFIG_HOTPLUG */
 224
 225 static int pnpbios_get_resources(struct pnp_dev * dev, struct pnp_resource_table * res)
 226 {
 227         u8 nodenum = dev->number;
 228         struct pnp_bios_node * node;
 229
 230         /* just in case */
 231         if(!pnpbios_is_dynamic(dev))
 232                 return -EPERM;
 233
 234         node = pnpbios_kmalloc(node_info.max_node_size, GFP_KERNEL);
 235         if (!node)
 236                 return -1;
 237         if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_DYNAMIC, node)) {
 238                 kfree(node);
 239                 return -ENODEV;
 240         }
 241         pnpbios_read_resources_from_node(res, node);
 242         dev->active = pnp_is_active(dev);
 243         kfree(node);
 244         return 0;
 245 }
 246
 247 static int pnpbios_set_resources(struct pnp_dev * dev, struct pnp_resource_table * res)
 248 {
 249         u8 nodenum = dev->number;
 250         struct pnp_bios_node * node;
 251         int ret;
 252
 253         /* just in case */
 254         if (!pnpbios_is_dynamic(dev))
 255                 return -EPERM;
 256
 257         node = pnpbios_kmalloc(node_info.max_node_size, GFP_KERNEL);
 258         if (!node)
 259                 return -1;
 260         if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_DYNAMIC, node)) {
 261                 kfree(node);
 262                 return -ENODEV;
 263         }
 264         if(pnpbios_write_resources_to_node(res, node)<0) {
 265                 kfree(node);
 266                 return -1;
 267         }
 268         ret = pnp_bios_set_dev_node(node->handle, (char)PNPMODE_DYNAMIC, node);
 269         kfree(node);
 270         if (ret > 0)
 271                 ret = -1;
 272         return ret;
 273 }
 274
 275 static void pnpbios_zero_data_stream(struct pnp_bios_node * node)
 276 {
 277         unsigned char * p = (char *)node->data;
 278         unsigned char * end = (char *)(node->data + node->size);
 279         unsigned int len;
 280         int i;
 281         while ((char *)p < (char *)end) {
 282                 if(p[0] & 0x80) { /* large tag */
 283                         len = (p[2] << 8) | p[1];
 284                         p += 3;
 285                 } else {
 286                         if (((p[0]>>3) & 0x0f) == 0x0f)
 287                                 return;
 288                         len = p[0] & 0x07;
 289                         p += 1;
 290                 }
 291                 for (i = 0; i < len; i++)
 292                         p[i] = 0;
 293                 p += len;
 294         }
 295         printk(KERN_ERR "PnPBIOS: Resource structure did not contain an end tag.\n");
 296 }
 297
 298 static int pnpbios_disable_resources(struct pnp_dev *dev)
 299 {
 300         struct pnp_bios_node * node;
 301         u8 nodenum = dev->number;
 302         int ret;
 303
 304         /* just in case */
 305         if(dev->flags & PNPBIOS_NO_DISABLE || !pnpbios_is_dynamic(dev))
 306                 return -EPERM;
 307
 308         node = pnpbios_kmalloc(node_info.max_node_size, GFP_KERNEL);
 309         if (!node)
 310                 return -ENOMEM;
 311
 312         if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_DYNAMIC, node)) {
 313                 kfree(node);
 314                 return -ENODEV;
 315         }
 316         pnpbios_zero_data_stream(node);
 317
 318         ret = pnp_bios_set_dev_node(dev->number, (char)PNPMODE_DYNAMIC, node);
 319         kfree(node);
 320         if (ret > 0)
 321                 ret = -1;
 322         return ret;
 323 }
 324
 325 /* PnP Layer support */
 326
 327 struct pnp_protocol pnpbios_protocol = {
 328         .name   = "Plug and Play BIOS",
 329         .get    = pnpbios_get_resources,
 330         .set    = pnpbios_set_resources,
 331         .disable = pnpbios_disable_resources,
 332 };
 333
 334 static int insert_device(struct pnp_dev *dev, struct pnp_bios_node * node)
 335 {
 336         struct list_head * pos;
 337         struct pnp_dev * pnp_dev;
 338         struct pnp_id *dev_id;
 339         char id[8];
 340
 341         /* check if the device is already added */
 342         dev->number = node->handle;
 343         list_for_each (pos, &pnpbios_protocol.devices){
 344                 pnp_dev = list_entry(pos, struct pnp_dev, protocol_list);
 345                 if (dev->number == pnp_dev->number)
 346                         return -1;
 347         }
 348
 349         /* set the initial values for the PnP device */
 350         dev_id = pnpbios_kmalloc(sizeof(struct pnp_id), GFP_KERNEL);
 351         if (!dev_id)
 352                 return -1;
 353         pnpid32_to_pnpid(node->eisa_id,id);
 354         memcpy(dev_id->id,id,7);
 355         pnp_add_id(dev_id, dev);
 356         pnpbios_parse_data_stream(dev, node);
 357         dev->active = pnp_is_active(dev);
 358         dev->flags = node->flags;
 359         if (!(dev->flags & PNPBIOS_NO_CONFIG))
 360                 dev->capabilities |= PNP_CONFIGURABLE;
 361         if (!(dev->flags & PNPBIOS_NO_DISABLE))
 362                 dev->capabilities |= PNP_DISABLE;
 363         dev->capabilities |= PNP_READ;
 364         if (pnpbios_is_dynamic(dev))
 365                 dev->capabilities |= PNP_WRITE;
 366         if (dev->flags & PNPBIOS_REMOVABLE)
 367                 dev->capabilities |= PNP_REMOVABLE;
 368         dev->protocol = &pnpbios_protocol;
 369
 370         /* clear out the damaged flags */
 371         if (!dev->active)
 372                 pnp_init_resource_table(&dev->res);
 373
 374         pnp_add_device(dev);
 375         pnpbios_interface_attach_device(node);
 376
 377         return 0;
 378 }
 379
 380 static void __init build_devlist(void)
 381 {
 382         u8 nodenum;
 383         unsigned int nodes_got = 0;
 384         unsigned int devs = 0;
 385         struct pnp_bios_node *node;
 386         struct pnp_dev *dev;
 387
 388         node = pnpbios_kmalloc(node_info.max_node_size, GFP_KERNEL);
 389         if (!node)
 390                 return;
 391
 392         for(nodenum=0; nodenum<0xff; ) {
 393                 u8 thisnodenum = nodenum;
 394                 /* eventually we will want to use PNPMODE_STATIC here but for now
 395                  * dynamic will help us catch buggy bioses to add to the blacklist.
 396                  */
 397                 if (!pnpbios_dont_use_current_config) {
 398                         if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_DYNAMIC, node))
 399                                 break;
 400                 } else {
 401                         if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_STATIC, node))
 402                                 break;
 403                 }
 404                 nodes_got++;
 405                 dev =  pnpbios_kmalloc(sizeof (struct pnp_dev), GFP_KERNEL);
 406                 if (!dev)
 407                         break;
 408                 if(insert_device(dev,node)<0)
 409                         kfree(dev);
 410                 else
 411                         devs++;
 412                 if (nodenum <= thisnodenum) {
 413                         printk(KERN_ERR "PnPBIOS: build_devlist: Node number 0x%x is out of sequence following node 0x%x. Aborting.\n", (unsigned int)nodenum, (unsigned int)thisnodenum);
 414                         break;
 415                 }
 416         }
 417         kfree(node);
 418
 419         printk(KERN_INFO "PnPBIOS: %i node%s reported by PnP BIOS; %i recorded by driver\n",
 420                 nodes_got, nodes_got != 1 ? "s" : "", devs);
 421 }
 422
 423 /*
 424  *
 425  * INIT AND EXIT
 426  *
 427  */
 428
 429 static int pnpbios_disabled; /* = 0 */
 430 int pnpbios_dont_use_current_config; /* = 0 */
 431
 432 #ifndef MODULE
 433 static int __init pnpbios_setup(char *str)
 434 {
 435         int invert;
 436
 437         while ((str != NULL) && (*str != '\0')) {
 438                 if (strncmp(str, "off", 3) == 0)
 439                         pnpbios_disabled=1;
 440                 if (strncmp(str, "on", 2) == 0)
 441                         pnpbios_disabled=0;
 442                 invert = (strncmp(str, "no-", 3) == 0);
 443                 if (invert)
 444                         str += 3;
 445                 if (strncmp(str, "curr", 4) == 0)
 446                         pnpbios_dont_use_current_config = invert;
 447                 str = strchr(str, ',');
 448                 if (str != NULL)
 449                         str += strspn(str, ", \t");
 450         }
 451
 452         return 1;
 453 }
 454
 455 __setup("pnpbios=", pnpbios_setup);
 456 #endif
 457
 458 /* PnP BIOS signature: "$PnP" */
 459 #define PNP_SIGNATURE   (('$' << 0) + ('P' << 8) + ('n' << 16) + ('P' << 24))
 460
 461 static int __init pnpbios_probe_system(void)
 462 {
 463         union pnp_bios_install_struct *check;
 464         u8 sum;
 465         int length, i;
 466
 467         printk(KERN_INFO "PnPBIOS: Scanning system for PnP BIOS support...\n");
 468
 469         /*
 470          * Search the defined area (0xf0000-0xffff0) for a valid PnP BIOS
 471          * structure and, if one is found, sets up the selectors and
 472          * entry points
 473          */
 474         for (check = (union pnp_bios_install_struct *) __va(0xf0000);
 475              check < (union pnp_bios_install_struct *) __va(0xffff0);
 476              check = (void *)check + 16) {
 477                 if (check->fields.signature != PNP_SIGNATURE)
 478                         continue;
 479                 printk(KERN_INFO "PnPBIOS: Found PnP BIOS installation structure at 0x%p\n", check);
 480                 length = check->fields.length;
 481                 if (!length) {
 482                         printk(KERN_ERR "PnPBIOS: installation structure is invalid, skipping\n");
 483                         continue;
 484                 }
 485                 for (sum = 0, i = 0; i < length; i++)
 486                         sum += check->chars[i];
 487                 if (sum) {
 488                         printk(KERN_ERR "PnPBIOS: installation structure is corrupted, skipping\n");
 489                         continue;
 490                 }
 491                 if (check->fields.version < 0x10) {
 492                         printk(KERN_WARNING "PnPBIOS: PnP BIOS version %d.%d is not supported\n",
 493                                check->fields.version >> 4,
 494                                check->fields.version & 15);
 495                         continue;
 496                 }
 497                 printk(KERN_INFO "PnPBIOS: PnP BIOS version %d.%d, entry 0x%x:0x%x, dseg 0x%x\n",
 498                        check->fields.version >> 4, check->fields.version & 15,
 499                        check->fields.pm16cseg, check->fields.pm16offset,
 500                        check->fields.pm16dseg);
 501                 pnp_bios_install = check;
 502                 return 1;
 503         }
 504
 505         printk(KERN_INFO "PnPBIOS: PnP BIOS support was not detected.\n");
 506         return 0;
 507 }
 508
 509 static int __init exploding_pnp_bios(struct dmi_system_id *d)
 510 {
 511         printk(KERN_WARNING "%s detected. Disabling PnPBIOS\n", d->ident);
 512         return 0;
 513 }
 514
 515 static struct dmi_system_id pnpbios_dmi_table[] = {
 516         {       /* PnPBIOS GPF on boot */
 517                 .callback = exploding_pnp_bios,
 518                 .ident = "Higraded P14H",
 519                 .matches = {
 520                         DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
 521                         DMI_MATCH(DMI_BIOS_VERSION, "07.00T"),
 522                         DMI_MATCH(DMI_SYS_VENDOR, "Higraded"),
 523                         DMI_MATCH(DMI_PRODUCT_NAME, "P14H"),
 524                 },
 525         },
 526         {       /* PnPBIOS GPF on boot */
 527                 .callback = exploding_pnp_bios,
 528                 .ident = "ASUS P4P800",
 529                 .matches = {
 530                         DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer Inc."),
 531                         DMI_MATCH(DMI_BOARD_NAME, "P4P800"),
 532                 },
 533         },
 534         { }
 535 };
 536
 537 static int __init pnpbios_init(void)
 538 {
 539         int ret;
 540
 541         if (pnpbios_disabled || dmi_check_system(pnpbios_dmi_table)) {
 542                 printk(KERN_INFO "PnPBIOS: Disabled\n");
 543                 return -ENODEV;
 544         }
 545
 546 #ifdef CONFIG_PNPACPI
 547         if (!acpi_disabled && !pnpacpi_disabled) {
 548                 pnpbios_disabled = 1;
 549                 printk(KERN_INFO "PnPBIOS: Disabled by ACPI PNP\n");
 550                 return -ENODEV;
 551         }
 552 #endif /* CONFIG_ACPI */
 553
 554         /* scan the system for pnpbios support */
 555         if (!pnpbios_probe_system())
 556                 return -ENODEV;
 557
 558         /* make preparations for bios calls */
 559         pnpbios_calls_init(pnp_bios_install);
 560
 561         /* read the node info */
 562         ret = pnp_bios_dev_node_info(&node_info);
 563         if (ret) {
 564                 printk(KERN_ERR "PnPBIOS: Unable to get node info.  Aborting.\n");
 565                 return ret;
 566         }
 567
 568         /* register with the pnp layer */
 569         ret = pnp_register_protocol(&pnpbios_protocol);
 570         if (ret) {
 571                 printk(KERN_ERR "PnPBIOS: Unable to register driver.  Aborting.\n");
 572                 return ret;
 573         }
 574
 575         /* start the proc interface */
 576         ret = pnpbios_proc_init();
 577         if (ret)
 578                 printk(KERN_ERR "PnPBIOS: Failed to create proc interface.\n");
 579
 580         /* scan for pnpbios devices */
 581         build_devlist();
 582
 583         return 0;
 584 }
 585
 586 subsys_initcall(pnpbios_init);
 587
 588 static int __init pnpbios_thread_init(void)
 589 {
 590         if (pnpbios_disabled)
 591                 return 0;
 592 #ifdef CONFIG_HOTPLUG
 593         init_completion(&unload_sem);
 594         if (kernel_thread(pnp_dock_thread, NULL, CLONE_KERNEL) > 0)
 595                 unloading = 0;
 596 #endif
 597         return 0;
 598 }
 599
 600 #ifndef MODULE
 601
 602 /* init/main.c calls pnpbios_init early */
 603
 604 /* Start the kernel thread later: */
 605 module_init(pnpbios_thread_init);
 606
 607 #else
 608
 609 /*
 610  * N.B.: Building pnpbios as a module hasn't been fully implemented
 611  */
 612
 613 MODULE_LICENSE("GPL");
 614
 615 static int __init pnpbios_init_all(void)
 616 {
 617         int r;
 618
 619         r = pnpbios_init();
 620         if (r)
 621                 return r;
 622         r = pnpbios_thread_init();
 623         if (r)
 624                 return r;
 625         return 0;
 626 }
 627
 628 static void __exit pnpbios_exit(void)
 629 {
 630 #ifdef CONFIG_HOTPLUG
 631         unloading = 1;
 632         wait_for_completion(&unload_sem);
 633 #endif
 634         pnpbios_proc_exit();
 635         /* We ought to free resources here */
 636         return;
 637 }
 638
 639 module_init(pnpbios_init_all);
 640 module_exit(pnpbios_exit);
 641
 642 #endif
 643
 644 EXPORT_SYMBOL(pnpbios_protocol);