err.no Git - linux-2.6/blob - 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 #include <linux/freezer.h>
  65 #include <linux/kthread.h>
  66
  67 #include <asm/page.h>
  68 #include <asm/desc.h>
  69 #include <asm/system.h>
  70 #include <asm/byteorder.h>
  71
  72 #include "pnpbios.h"
  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 /*
  90  *
  91  * DOCKING FUNCTIONS
  92  *
  93  */
  94
  95 #ifdef CONFIG_HOTPLUG
  96
  97 static int unloading = 0;
  98 static struct completion unload_sem;
  99
 100 /*
 101  * (Much of this belongs in a shared routine somewhere)
 102  */
 103
 104 static int pnp_dock_event(int dock, struct pnp_docking_station_info *info)
 105 {
 106         char *argv[3], **envp, *buf, *scratch;
 107         int i = 0, value;
 108
 109         if (!current->fs->root) {
 110                 return -EAGAIN;
 111         }
 112         if (!(envp = kcalloc(20, sizeof(char *), GFP_KERNEL))) {
 113                 return -ENOMEM;
 114         }
 115         if (!(buf = kzalloc(256, GFP_KERNEL))) {
 116                 kfree(envp);
 117                 return -ENOMEM;
 118         }
 119
 120         /* FIXME: if there are actual users of this, it should be integrated into
 121          * the driver core and use the usual infrastructure like sysfs and uevents */
 122         argv[0] = "/sbin/pnpbios";
 123         argv[1] = "dock";
 124         argv[2] = NULL;
 125
 126         /* minimal command environment */
 127         envp[i++] = "HOME=/";
 128         envp[i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
 129
 130 #ifdef  DEBUG
 131         /* hint that policy agent should enter no-stdout debug mode */
 132         envp[i++] = "DEBUG=kernel";
 133 #endif
 134         /* extensible set of named bus-specific parameters,
 135          * supporting multiple driver selection algorithms.
 136          */
 137         scratch = buf;
 138
 139         /* action:  add, remove */
 140         envp[i++] = scratch;
 141         scratch += sprintf(scratch, "ACTION=%s", dock ? "add" : "remove") + 1;
 142
 143         /* Report the ident for the dock */
 144         envp[i++] = scratch;
 145         scratch += sprintf(scratch, "DOCK=%x/%x/%x",
 146                            info->location_id, info->serial, info->capabilities);
 147         envp[i] = NULL;
 148
 149         value = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_EXEC);
 150         kfree(buf);
 151         kfree(envp);
 152         return 0;
 153 }
 154
 155 /*
 156  * Poll the PnP docking at regular intervals
 157  */
 158 static int pnp_dock_thread(void *unused)
 159 {
 160         static struct pnp_docking_station_info now;
 161         int docked = -1, d = 0;
 162         set_freezable();
 163         while (!unloading) {
 164                 int status;
 165
 166                 /*
 167                  * Poll every 2 seconds
 168                  */
 169                 msleep_interruptible(2000);
 170
 171                 if (try_to_freeze())
 172                         continue;
 173
 174                 status = pnp_bios_dock_station_info(&now);
 175
 176                 switch (status) {
 177                         /*
 178                          * No dock to manage
 179                          */
 180                 case PNP_FUNCTION_NOT_SUPPORTED:
 181                         complete_and_exit(&unload_sem, 0);
 182                 case PNP_SYSTEM_NOT_DOCKED:
 183                         d = 0;
 184                         break;
 185                 case PNP_SUCCESS:
 186                         d = 1;
 187                         break;
 188                 default:
 189                         pnpbios_print_status("pnp_dock_thread", status);
 190                         continue;
 191                 }
 192                 if (d != docked) {
 193                         if (pnp_dock_event(d, &now) == 0) {
 194                                 docked = d;
 195 #if 0
 196                                 printk(KERN_INFO
 197                                        "PnPBIOS: Docking station %stached\n",
 198                                        docked ? "at" : "de");
 199 #endif
 200                         }
 201                 }
 202         }
 203         complete_and_exit(&unload_sem, 0);
 204 }
 205
 206 #endif /* CONFIG_HOTPLUG */
 207
 208 static int pnpbios_get_resources(struct pnp_dev *dev,
 209                                  struct pnp_resource_table *res)
 210 {
 211         u8 nodenum = dev->number;
 212         struct pnp_bios_node *node;
 213
 214         /* just in case */
 215         if (!pnpbios_is_dynamic(dev))
 216                 return -EPERM;
 217
 218         node = kzalloc(node_info.max_node_size, GFP_KERNEL);
 219         if (!node)
 220                 return -1;
 221         if (pnp_bios_get_dev_node(&nodenum, (char)PNPMODE_DYNAMIC, node)) {
 222                 kfree(node);
 223                 return -ENODEV;
 224         }
 225         pnpbios_read_resources_from_node(res, node);
 226         dev->active = pnp_is_active(dev);
 227         kfree(node);
 228         return 0;
 229 }
 230
 231 static int pnpbios_set_resources(struct pnp_dev *dev,
 232                                  struct pnp_resource_table *res)
 233 {
 234         u8 nodenum = dev->number;
 235         struct pnp_bios_node *node;
 236         int ret;
 237
 238         /* just in case */
 239         if (!pnpbios_is_dynamic(dev))
 240                 return -EPERM;
 241
 242         node = kzalloc(node_info.max_node_size, GFP_KERNEL);
 243         if (!node)
 244                 return -1;
 245         if (pnp_bios_get_dev_node(&nodenum, (char)PNPMODE_DYNAMIC, node)) {
 246                 kfree(node);
 247                 return -ENODEV;
 248         }
 249         if (pnpbios_write_resources_to_node(res, node) < 0) {
 250                 kfree(node);
 251                 return -1;
 252         }
 253         ret = pnp_bios_set_dev_node(node->handle, (char)PNPMODE_DYNAMIC, node);
 254         kfree(node);
 255         if (ret > 0)
 256                 ret = -1;
 257         return ret;
 258 }
 259
 260 static void pnpbios_zero_data_stream(struct pnp_bios_node *node)
 261 {
 262         unsigned char *p = (char *)node->data;
 263         unsigned char *end = (char *)(node->data + node->size);
 264         unsigned int len;
 265         int i;
 266         while ((char *)p < (char *)end) {
 267                 if (p[0] & 0x80) {      /* large tag */
 268                         len = (p[2] << 8) | p[1];
 269                         p += 3;
 270                 } else {
 271                         if (((p[0] >> 3) & 0x0f) == 0x0f)
 272                                 return;
 273                         len = p[0] & 0x07;
 274                         p += 1;
 275                 }
 276                 for (i = 0; i < len; i++)
 277                         p[i] = 0;
 278                 p += len;
 279         }
 280         printk(KERN_ERR
 281                "PnPBIOS: Resource structure did not contain an end tag.\n");
 282 }
 283
 284 static int pnpbios_disable_resources(struct pnp_dev *dev)
 285 {
 286         struct pnp_bios_node *node;
 287         u8 nodenum = dev->number;
 288         int ret;
 289
 290         /* just in case */
 291         if (dev->flags & PNPBIOS_NO_DISABLE || !pnpbios_is_dynamic(dev))
 292                 return -EPERM;
 293
 294         node = kzalloc(node_info.max_node_size, GFP_KERNEL);
 295         if (!node)
 296                 return -ENOMEM;
 297
 298         if (pnp_bios_get_dev_node(&nodenum, (char)PNPMODE_DYNAMIC, node)) {
 299                 kfree(node);
 300                 return -ENODEV;
 301         }
 302         pnpbios_zero_data_stream(node);
 303
 304         ret = pnp_bios_set_dev_node(dev->number, (char)PNPMODE_DYNAMIC, node);
 305         kfree(node);
 306         if (ret > 0)
 307                 ret = -1;
 308         return ret;
 309 }
 310
 311 /* PnP Layer support */
 312
 313 struct pnp_protocol pnpbios_protocol = {
 314         .name = "Plug and Play BIOS",
 315         .get = pnpbios_get_resources,
 316         .set = pnpbios_set_resources,
 317         .disable = pnpbios_disable_resources,
 318 };
 319
 320 static int insert_device(struct pnp_dev *dev, struct pnp_bios_node *node)
 321 {
 322         struct list_head *pos;
 323         struct pnp_dev *pnp_dev;
 324         struct pnp_id *dev_id;
 325         char id[8];
 326
 327         /* check if the device is already added */
 328         dev->number = node->handle;
 329         list_for_each(pos, &pnpbios_protocol.devices) {
 330                 pnp_dev = list_entry(pos, struct pnp_dev, protocol_list);
 331                 if (dev->number == pnp_dev->number)
 332                         return -1;
 333         }
 334
 335         /* set the initial values for the PnP device */
 336         dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
 337         if (!dev_id)
 338                 return -1;
 339         pnpid32_to_pnpid(node->eisa_id, id);
 340         memcpy(dev_id->id, id, 7);
 341         pnp_add_id(dev_id, dev);
 342         pnpbios_parse_data_stream(dev, node);
 343         dev->active = pnp_is_active(dev);
 344         dev->flags = node->flags;
 345         if (!(dev->flags & PNPBIOS_NO_CONFIG))
 346                 dev->capabilities |= PNP_CONFIGURABLE;
 347         if (!(dev->flags & PNPBIOS_NO_DISABLE) && pnpbios_is_dynamic(dev))
 348                 dev->capabilities |= PNP_DISABLE;
 349         dev->capabilities |= PNP_READ;
 350         if (pnpbios_is_dynamic(dev))
 351                 dev->capabilities |= PNP_WRITE;
 352         if (dev->flags & PNPBIOS_REMOVABLE)
 353                 dev->capabilities |= PNP_REMOVABLE;
 354         dev->protocol = &pnpbios_protocol;
 355
 356         /* clear out the damaged flags */
 357         if (!dev->active)
 358                 pnp_init_resource_table(&dev->res);
 359
 360         pnp_add_device(dev);
 361         pnpbios_interface_attach_device(node);
 362
 363         return 0;
 364 }
 365
 366 static void __init build_devlist(void)
 367 {
 368         u8 nodenum;
 369         unsigned int nodes_got = 0;
 370         unsigned int devs = 0;
 371         struct pnp_bios_node *node;
 372         struct pnp_dev *dev;
 373
 374         node = kzalloc(node_info.max_node_size, GFP_KERNEL);
 375         if (!node)
 376                 return;
 377
 378         for (nodenum = 0; nodenum < 0xff;) {
 379                 u8 thisnodenum = nodenum;
 380                 /* eventually we will want to use PNPMODE_STATIC here but for now
 381                  * dynamic will help us catch buggy bioses to add to the blacklist.
 382                  */
 383                 if (!pnpbios_dont_use_current_config) {
 384                         if (pnp_bios_get_dev_node
 385                             (&nodenum, (char)PNPMODE_DYNAMIC, node))
 386                                 break;
 387                 } else {
 388                         if (pnp_bios_get_dev_node
 389                             (&nodenum, (char)PNPMODE_STATIC, node))
 390                                 break;
 391                 }
 392                 nodes_got++;
 393                 dev = kzalloc(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
 402                                "PnPBIOS: build_devlist: Node number 0x%x is out of sequence following node 0x%x. Aborting.\n",
 403                                (unsigned int)nodenum,
 404                                (unsigned int)thisnodenum);
 405                         break;
 406                 }
 407         }
 408         kfree(node);
 409
 410         printk(KERN_INFO
 411                "PnPBIOS: %i node%s reported by PnP BIOS; %i recorded by driver\n",
 412                nodes_got, nodes_got != 1 ? "s" : "", devs);
 413 }
 414
 415 /*
 416  *
 417  * INIT AND EXIT
 418  *
 419  */
 420
 421 static int pnpbios_disabled;    /* = 0 */
 422 int pnpbios_dont_use_current_config;    /* = 0 */
 423
 424 #ifndef MODULE
 425 static int __init pnpbios_setup(char *str)
 426 {
 427         int invert;
 428
 429         while ((str != NULL) && (*str != '\0')) {
 430                 if (strncmp(str, "off", 3) == 0)
 431                         pnpbios_disabled = 1;
 432                 if (strncmp(str, "on", 2) == 0)
 433                         pnpbios_disabled = 0;
 434                 invert = (strncmp(str, "no-", 3) == 0);
 435                 if (invert)
 436                         str += 3;
 437                 if (strncmp(str, "curr", 4) == 0)
 438                         pnpbios_dont_use_current_config = invert;
 439                 str = strchr(str, ',');
 440                 if (str != NULL)
 441                         str += strspn(str, ", \t");
 442         }
 443
 444         return 1;
 445 }
 446
 447 __setup("pnpbios=", pnpbios_setup);
 448 #endif
 449
 450 /* PnP BIOS signature: "$PnP" */
 451 #define PNP_SIGNATURE   (('$' << 0) + ('P' << 8) + ('n' << 16) + ('P' << 24))
 452
 453 static int __init pnpbios_probe_system(void)
 454 {
 455         union pnp_bios_install_struct *check;
 456         u8 sum;
 457         int length, i;
 458
 459         printk(KERN_INFO "PnPBIOS: Scanning system for PnP BIOS support...\n");
 460
 461         /*
 462          * Search the defined area (0xf0000-0xffff0) for a valid PnP BIOS
 463          * structure and, if one is found, sets up the selectors and
 464          * entry points
 465          */
 466         for (check = (union pnp_bios_install_struct *)__va(0xf0000);
 467              check < (union pnp_bios_install_struct *)__va(0xffff0);
 468              check = (void *)check + 16) {
 469                 if (check->fields.signature != PNP_SIGNATURE)
 470                         continue;
 471                 printk(KERN_INFO
 472                        "PnPBIOS: Found PnP BIOS installation structure at 0x%p\n",
 473                        check);
 474                 length = check->fields.length;
 475                 if (!length) {
 476                         printk(KERN_ERR
 477                                "PnPBIOS: installation structure is invalid, skipping\n");
 478                         continue;
 479                 }
 480                 for (sum = 0, i = 0; i < length; i++)
 481                         sum += check->chars[i];
 482                 if (sum) {
 483                         printk(KERN_ERR
 484                                "PnPBIOS: installation structure is corrupted, skipping\n");
 485                         continue;
 486                 }
 487                 if (check->fields.version < 0x10) {
 488                         printk(KERN_WARNING
 489                                "PnPBIOS: PnP BIOS version %d.%d is not supported\n",
 490                                check->fields.version >> 4,
 491                                check->fields.version & 15);
 492                         continue;
 493                 }
 494                 printk(KERN_INFO
 495                        "PnPBIOS: PnP BIOS version %d.%d, entry 0x%x:0x%x, dseg 0x%x\n",
 496                        check->fields.version >> 4, check->fields.version & 15,
 497                        check->fields.pm16cseg, check->fields.pm16offset,
 498                        check->fields.pm16dseg);
 499                 pnp_bios_install = check;
 500                 return 1;
 501         }
 502
 503         printk(KERN_INFO "PnPBIOS: PnP BIOS support was not detected.\n");
 504         return 0;
 505 }
 506
 507 static int __init exploding_pnp_bios(struct dmi_system_id *d)
 508 {
 509         printk(KERN_WARNING "%s detected. Disabling PnPBIOS\n", d->ident);
 510         return 0;
 511 }
 512
 513 static struct dmi_system_id pnpbios_dmi_table[] __initdata = {
 514         {                       /* PnPBIOS GPF on boot */
 515          .callback = exploding_pnp_bios,
 516          .ident = "Higraded P14H",
 517          .matches = {
 518                      DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
 519                      DMI_MATCH(DMI_BIOS_VERSION, "07.00T"),
 520                      DMI_MATCH(DMI_SYS_VENDOR, "Higraded"),
 521                      DMI_MATCH(DMI_PRODUCT_NAME, "P14H"),
 522                      },
 523          },
 524         {                       /* PnPBIOS GPF on boot */
 525          .callback = exploding_pnp_bios,
 526          .ident = "ASUS P4P800",
 527          .matches = {
 528                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer Inc."),
 529                      DMI_MATCH(DMI_BOARD_NAME, "P4P800"),
 530                      },
 531          },
 532         {}
 533 };
 534
 535 static int __init pnpbios_init(void)
 536 {
 537         int ret;
 538
 539 #if defined(CONFIG_PPC_MERGE)
 540         if (check_legacy_ioport(PNPBIOS_BASE))
 541                 return -ENODEV;
 542 #endif
 543         if (pnpbios_disabled || dmi_check_system(pnpbios_dmi_table) ||
 544             paravirt_enabled()) {
 545                 printk(KERN_INFO "PnPBIOS: Disabled\n");
 546                 return -ENODEV;
 547         }
 548 #ifdef CONFIG_PNPACPI
 549         if (!acpi_disabled && !pnpacpi_disabled) {
 550                 pnpbios_disabled = 1;
 551                 printk(KERN_INFO "PnPBIOS: Disabled by ACPI PNP\n");
 552                 return -ENODEV;
 553         }
 554 #endif /* CONFIG_ACPI */
 555
 556         /* scan the system for pnpbios support */
 557         if (!pnpbios_probe_system())
 558                 return -ENODEV;
 559
 560         /* make preparations for bios calls */
 561         pnpbios_calls_init(pnp_bios_install);
 562
 563         /* read the node info */
 564         ret = pnp_bios_dev_node_info(&node_info);
 565         if (ret) {
 566                 printk(KERN_ERR
 567                        "PnPBIOS: Unable to get node info.  Aborting.\n");
 568                 return ret;
 569         }
 570
 571         /* register with the pnp layer */
 572         ret = pnp_register_protocol(&pnpbios_protocol);
 573         if (ret) {
 574                 printk(KERN_ERR
 575                        "PnPBIOS: Unable to register driver.  Aborting.\n");
 576                 return ret;
 577         }
 578
 579         /* start the proc interface */
 580         ret = pnpbios_proc_init();
 581         if (ret)
 582                 printk(KERN_ERR "PnPBIOS: Failed to create proc interface.\n");
 583
 584         /* scan for pnpbios devices */
 585         build_devlist();
 586
 587         pnp_platform_devices = 1;
 588         return 0;
 589 }
 590
 591 subsys_initcall(pnpbios_init);
 592
 593 static int __init pnpbios_thread_init(void)
 594 {
 595         struct task_struct *task;
 596 #if defined(CONFIG_PPC_MERGE)
 597         if (check_legacy_ioport(PNPBIOS_BASE))
 598                 return 0;
 599 #endif
 600         if (pnpbios_disabled)
 601                 return 0;
 602 #ifdef CONFIG_HOTPLUG
 603         init_completion(&unload_sem);
 604         task = kthread_run(pnp_dock_thread, NULL, "kpnpbiosd");
 605         if (!IS_ERR(task))
 606                 unloading = 0;
 607 #endif
 608         return 0;
 609 }
 610
 611 #ifndef MODULE
 612
 613 /* init/main.c calls pnpbios_init early */
 614
 615 /* Start the kernel thread later: */
 616 module_init(pnpbios_thread_init);
 617
 618 #else
 619
 620 /*
 621  * N.B.: Building pnpbios as a module hasn't been fully implemented
 622  */
 623
 624 MODULE_LICENSE("GPL");
 625
 626 static int __init pnpbios_init_all(void)
 627 {
 628         int r;
 629
 630         r = pnpbios_init();
 631         if (r)
 632                 return r;
 633         r = pnpbios_thread_init();
 634         if (r)
 635                 return r;
 636         return 0;
 637 }
 638
 639 static void __exit pnpbios_exit(void)
 640 {
 641 #ifdef CONFIG_HOTPLUG
 642         unloading = 1;
 643         wait_for_completion(&unload_sem);
 644 #endif
 645         pnpbios_proc_exit();
 646         /* We ought to free resources here */
 647         return;
 648 }
 649
 650 module_init(pnpbios_init_all);
 651 module_exit(pnpbios_exit);
 652
 653 #endif
 654
 655 EXPORT_SYMBOL(pnpbios_protocol);