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