release/src-rt-6.x.4708/linux/linux-2.6.36/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/device.h>
  54 #include <linux/pnp.h>
  55 #include <linux/mm.h>
  56 #include <linux/smp.h>
  57 #include <linux/slab.h>
  58 #include <linux/completion.h>
  59 #include <linux/spinlock.h>
  60 #include <linux/dmi.h>
  61 #include <linux/delay.h>
  62 #include <linux/acpi.h>
  63 #include <linux/freezer.h>
  64 #include <linux/kthread.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 "../base.h"
  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 struct completion unload_sem;
  98
  99 /*
 100  * (Much of this belongs in a shared routine somewhere)
 101  */
 102 static int pnp_dock_event(int dock, struct pnp_docking_station_info *info)
 103 {
 104         char *argv[3], **envp, *buf, *scratch;
 105         int i = 0, value;
 106
 107         if (!(envp = kcalloc(20, sizeof(char *), GFP_KERNEL)))
 108                 return -ENOMEM;
 109         if (!(buf = kzalloc(256, GFP_KERNEL))) {
 110                 kfree(envp);
 111                 return -ENOMEM;
 112         }
 113
 114         argv[0] = "/sbin/pnpbios";
 115         argv[1] = "dock";
 116         argv[2] = NULL;
 117
 118         /* minimal command environment */
 119         envp[i++] = "HOME=/";
 120         envp[i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
 121
 122 #ifdef  DEBUG
 123         /* hint that policy agent should enter no-stdout debug mode */
 124         envp[i++] = "DEBUG=kernel";
 125 #endif
 126         /* extensible set of named bus-specific parameters,
 127          * supporting multiple driver selection algorithms.
 128          */
 129         scratch = buf;
 130
 131         /* action:  add, remove */
 132         envp[i++] = scratch;
 133         scratch += sprintf(scratch, "ACTION=%s", dock ? "add" : "remove") + 1;
 134
 135         /* Report the ident for the dock */
 136         envp[i++] = scratch;
 137         scratch += sprintf(scratch, "DOCK=%x/%x/%x",
 138                            info->location_id, info->serial, info->capabilities);
 139         envp[i] = NULL;
 140
 141         value = call_usermodehelper(argv [0], argv, envp, UMH_WAIT_EXEC);
 142         kfree(buf);
 143         kfree(envp);
 144         return 0;
 145 }
 146
 147 /*
 148  * Poll the PnP docking at regular intervals
 149  */
 150 static int pnp_dock_thread(void *unused)
 151 {
 152         static struct pnp_docking_station_info now;
 153         int docked = -1, d = 0;
 154
 155         set_freezable();
 156         while (1) {
 157                 int status;
 158
 159                 /*
 160                  * Poll every 2 seconds
 161                  */
 162                 msleep_interruptible(2000);
 163
 164                 if (try_to_freeze())
 165                         continue;
 166
 167                 status = pnp_bios_dock_station_info(&now);
 168
 169                 switch (status) {
 170                         /*
 171                          * No dock to manage
 172                          */
 173                 case PNP_FUNCTION_NOT_SUPPORTED:
 174                         complete_and_exit(&unload_sem, 0);
 175                 case PNP_SYSTEM_NOT_DOCKED:
 176                         d = 0;
 177                         break;
 178                 case PNP_SUCCESS:
 179                         d = 1;
 180                         break;
 181                 default:
 182                         pnpbios_print_status("pnp_dock_thread", status);
 183                         continue;
 184                 }
 185                 if (d != docked) {
 186                         if (pnp_dock_event(d, &now) == 0) {
 187                                 docked = d;
 188                         }
 189                 }
 190         }
 191         complete_and_exit(&unload_sem, 0);
 192 }
 193
 194 #endif                          /* CONFIG_HOTPLUG */
 195
 196 static int pnpbios_get_resources(struct pnp_dev *dev)
 197 {
 198         u8 nodenum = dev->number;
 199         struct pnp_bios_node *node;
 200
 201         if (!pnpbios_is_dynamic(dev))
 202                 return -EPERM;
 203
 204         pnp_dbg(&dev->dev, "get resources\n");
 205         node = kzalloc(node_info.max_node_size, GFP_KERNEL);
 206         if (!node)
 207                 return -1;
 208         if (pnp_bios_get_dev_node(&nodenum, (char)PNPMODE_DYNAMIC, node)) {
 209                 kfree(node);
 210                 return -ENODEV;
 211         }
 212         pnpbios_read_resources_from_node(dev, node);
 213         dev->active = pnp_is_active(dev);
 214         kfree(node);
 215         return 0;
 216 }
 217
 218 static int pnpbios_set_resources(struct pnp_dev *dev)
 219 {
 220         u8 nodenum = dev->number;
 221         struct pnp_bios_node *node;
 222         int ret;
 223
 224         if (!pnpbios_is_dynamic(dev))
 225                 return -EPERM;
 226
 227         pnp_dbg(&dev->dev, "set resources\n");
 228         node = kzalloc(node_info.max_node_size, GFP_KERNEL);
 229         if (!node)
 230                 return -1;
 231         if (pnp_bios_get_dev_node(&nodenum, (char)PNPMODE_DYNAMIC, node)) {
 232                 kfree(node);
 233                 return -ENODEV;
 234         }
 235         if (pnpbios_write_resources_to_node(dev, node) < 0) {
 236                 kfree(node);
 237                 return -1;
 238         }
 239         ret = pnp_bios_set_dev_node(node->handle, (char)PNPMODE_DYNAMIC, node);
 240         kfree(node);
 241         if (ret > 0)
 242                 ret = -1;
 243         return ret;
 244 }
 245
 246 static void pnpbios_zero_data_stream(struct pnp_bios_node *node)
 247 {
 248         unsigned char *p = (char *)node->data;
 249         unsigned char *end = (char *)(node->data + node->size);
 250         unsigned int len;
 251         int i;
 252
 253         while ((char *)p < (char *)end) {
 254                 if (p[0] & 0x80) {      /* large tag */
 255                         len = (p[2] << 8) | p[1];
 256                         p += 3;
 257                 } else {
 258                         if (((p[0] >> 3) & 0x0f) == 0x0f)
 259                                 return;
 260                         len = p[0] & 0x07;
 261                         p += 1;
 262                 }
 263                 for (i = 0; i < len; i++)
 264                         p[i] = 0;
 265                 p += len;
 266         }
 267         printk(KERN_ERR
 268                "PnPBIOS: Resource structure did not contain an end tag.\n");
 269 }
 270
 271 static int pnpbios_disable_resources(struct pnp_dev *dev)
 272 {
 273         struct pnp_bios_node *node;
 274         u8 nodenum = dev->number;
 275         int ret;
 276
 277         if (dev->flags & PNPBIOS_NO_DISABLE || !pnpbios_is_dynamic(dev))
 278                 return -EPERM;
 279
 280         node = kzalloc(node_info.max_node_size, GFP_KERNEL);
 281         if (!node)
 282                 return -ENOMEM;
 283
 284         if (pnp_bios_get_dev_node(&nodenum, (char)PNPMODE_DYNAMIC, node)) {
 285                 kfree(node);
 286                 return -ENODEV;
 287         }
 288         pnpbios_zero_data_stream(node);
 289
 290         ret = pnp_bios_set_dev_node(dev->number, (char)PNPMODE_DYNAMIC, node);
 291         kfree(node);
 292         if (ret > 0)
 293                 ret = -1;
 294         return ret;
 295 }
 296
 297 /* PnP Layer support */
 298
 299 struct pnp_protocol pnpbios_protocol = {
 300         .name = "Plug and Play BIOS",
 301         .get = pnpbios_get_resources,
 302         .set = pnpbios_set_resources,
 303         .disable = pnpbios_disable_resources,
 304 };
 305
 306 static int __init insert_device(struct pnp_bios_node *node)
 307 {
 308         struct list_head *pos;
 309         struct pnp_dev *dev;
 310         char id[8];
 311
 312         /* check if the device is already added */
 313         list_for_each(pos, &pnpbios_protocol.devices) {
 314                 dev = list_entry(pos, struct pnp_dev, protocol_list);
 315                 if (dev->number == node->handle)
 316                         return -1;
 317         }
 318
 319         pnp_eisa_id_to_string(node->eisa_id & PNP_EISA_ID_MASK, id);
 320         dev = pnp_alloc_dev(&pnpbios_protocol, node->handle, id);
 321         if (!dev)
 322                 return -1;
 323
 324         pnpbios_parse_data_stream(dev, node);
 325         dev->active = pnp_is_active(dev);
 326         dev->flags = node->flags;
 327         if (!(dev->flags & PNPBIOS_NO_CONFIG))
 328                 dev->capabilities |= PNP_CONFIGURABLE;
 329         if (!(dev->flags & PNPBIOS_NO_DISABLE) && pnpbios_is_dynamic(dev))
 330                 dev->capabilities |= PNP_DISABLE;
 331         dev->capabilities |= PNP_READ;
 332         if (pnpbios_is_dynamic(dev))
 333                 dev->capabilities |= PNP_WRITE;
 334         if (dev->flags & PNPBIOS_REMOVABLE)
 335                 dev->capabilities |= PNP_REMOVABLE;
 336
 337         /* clear out the damaged flags */
 338         if (!dev->active)
 339                 pnp_init_resources(dev);
 340
 341         pnp_add_device(dev);
 342         pnpbios_interface_attach_device(node);
 343
 344         return 0;
 345 }
 346
 347 static void __init build_devlist(void)
 348 {
 349         u8 nodenum;
 350         unsigned int nodes_got = 0;
 351         unsigned int devs = 0;
 352         struct pnp_bios_node *node;
 353
 354         node = kzalloc(node_info.max_node_size, GFP_KERNEL);
 355         if (!node)
 356                 return;
 357
 358         for (nodenum = 0; nodenum < 0xff;) {
 359                 u8 thisnodenum = nodenum;
 360                 /* eventually we will want to use PNPMODE_STATIC here but for now
 361                  * dynamic will help us catch buggy bioses to add to the blacklist.
 362                  */
 363                 if (!pnpbios_dont_use_current_config) {
 364                         if (pnp_bios_get_dev_node
 365                             (&nodenum, (char)PNPMODE_DYNAMIC, node))
 366                                 break;
 367                 } else {
 368                         if (pnp_bios_get_dev_node
 369                             (&nodenum, (char)PNPMODE_STATIC, node))
 370                                 break;
 371                 }
 372                 nodes_got++;
 373                 if (insert_device(node) == 0)
 374                         devs++;
 375                 if (nodenum <= thisnodenum) {
 376                         printk(KERN_ERR
 377                                "PnPBIOS: build_devlist: Node number 0x%x is out of sequence following node 0x%x. Aborting.\n",
 378                                (unsigned int)nodenum,
 379                                (unsigned int)thisnodenum);
 380                         break;
 381                 }
 382         }
 383         kfree(node);
 384
 385         printk(KERN_INFO
 386                "PnPBIOS: %i node%s reported by PnP BIOS; %i recorded by driver\n",
 387                nodes_got, nodes_got != 1 ? "s" : "", devs);
 388 }
 389
 390 /*
 391  *
 392  * INIT AND EXIT
 393  *
 394  */
 395
 396 static int pnpbios_disabled;
 397 int pnpbios_dont_use_current_config;
 398
 399 static int __init pnpbios_setup(char *str)
 400 {
 401         int invert;
 402
 403         while ((str != NULL) && (*str != '\0')) {
 404                 if (strncmp(str, "off", 3) == 0)
 405                         pnpbios_disabled = 1;
 406                 if (strncmp(str, "on", 2) == 0)
 407                         pnpbios_disabled = 0;
 408                 invert = (strncmp(str, "no-", 3) == 0);
 409                 if (invert)
 410                         str += 3;
 411                 if (strncmp(str, "curr", 4) == 0)
 412                         pnpbios_dont_use_current_config = invert;
 413                 str = strchr(str, ',');
 414                 if (str != NULL)
 415                         str += strspn(str, ", \t");
 416         }
 417
 418         return 1;
 419 }
 420
 421 __setup("pnpbios=", pnpbios_setup);
 422
 423 /* PnP BIOS signature: "$PnP" */
 424 #define PNP_SIGNATURE   (('$' << 0) + ('P' << 8) + ('n' << 16) + ('P' << 24))
 425
 426 static int __init pnpbios_probe_system(void)
 427 {
 428         union pnp_bios_install_struct *check;
 429         u8 sum;
 430         int length, i;
 431
 432         printk(KERN_INFO "PnPBIOS: Scanning system for PnP BIOS support...\n");
 433
 434         /*
 435          * Search the defined area (0xf0000-0xffff0) for a valid PnP BIOS
 436          * structure and, if one is found, sets up the selectors and
 437          * entry points
 438          */
 439         for (check = (union pnp_bios_install_struct *)__va(0xf0000);
 440              check < (union pnp_bios_install_struct *)__va(0xffff0);
 441              check = (void *)check + 16) {
 442                 if (check->fields.signature != PNP_SIGNATURE)
 443                         continue;
 444                 printk(KERN_INFO
 445                        "PnPBIOS: Found PnP BIOS installation structure at 0x%p\n",
 446                        check);
 447                 length = check->fields.length;
 448                 if (!length) {
 449                         printk(KERN_ERR
 450                                "PnPBIOS: installation structure is invalid, skipping\n");
 451                         continue;
 452                 }
 453                 for (sum = 0, i = 0; i < length; i++)
 454                         sum += check->chars[i];
 455                 if (sum) {
 456                         printk(KERN_ERR
 457                                "PnPBIOS: installation structure is corrupted, skipping\n");
 458                         continue;
 459                 }
 460                 if (check->fields.version < 0x10) {
 461                         printk(KERN_WARNING
 462                                "PnPBIOS: PnP BIOS version %d.%d is not supported\n",
 463                                check->fields.version >> 4,
 464                                check->fields.version & 15);
 465                         continue;
 466                 }
 467                 printk(KERN_INFO
 468                        "PnPBIOS: PnP BIOS version %d.%d, entry 0x%x:0x%x, dseg 0x%x\n",
 469                        check->fields.version >> 4, check->fields.version & 15,
 470                        check->fields.pm16cseg, check->fields.pm16offset,
 471                        check->fields.pm16dseg);
 472                 pnp_bios_install = check;
 473                 return 1;
 474         }
 475
 476         printk(KERN_INFO "PnPBIOS: PnP BIOS support was not detected.\n");
 477         return 0;
 478 }
 479
 480 static int __init exploding_pnp_bios(const struct dmi_system_id *d)
 481 {
 482         printk(KERN_WARNING "%s detected. Disabling PnPBIOS\n", d->ident);
 483         return 0;
 484 }
 485
 486 static struct dmi_system_id pnpbios_dmi_table[] __initdata = {
 487         {                       /* PnPBIOS GPF on boot */
 488          .callback = exploding_pnp_bios,
 489          .ident = "Higraded P14H",
 490          .matches = {
 491                      DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
 492                      DMI_MATCH(DMI_BIOS_VERSION, "07.00T"),
 493                      DMI_MATCH(DMI_SYS_VENDOR, "Higraded"),
 494                      DMI_MATCH(DMI_PRODUCT_NAME, "P14H"),
 495                      },
 496          },
 497         {                       /* PnPBIOS GPF on boot */
 498          .callback = exploding_pnp_bios,
 499          .ident = "ASUS P4P800",
 500          .matches = {
 501                      DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer Inc."),
 502                      DMI_MATCH(DMI_BOARD_NAME, "P4P800"),
 503                      },
 504          },
 505         {}
 506 };
 507
 508 static int __init pnpbios_init(void)
 509 {
 510         int ret;
 511
 512 #if defined(CONFIG_PPC)
 513         if (check_legacy_ioport(PNPBIOS_BASE))
 514                 return -ENODEV;
 515 #endif
 516         if (pnpbios_disabled || dmi_check_system(pnpbios_dmi_table) ||
 517             paravirt_enabled()) {
 518                 printk(KERN_INFO "PnPBIOS: Disabled\n");
 519                 return -ENODEV;
 520         }
 521 #ifdef CONFIG_PNPACPI
 522         if (!acpi_disabled && !pnpacpi_disabled) {
 523                 pnpbios_disabled = 1;
 524                 printk(KERN_INFO "PnPBIOS: Disabled by ACPI PNP\n");
 525                 return -ENODEV;
 526         }
 527 #endif                          /* CONFIG_ACPI */
 528
 529         /* scan the system for pnpbios support */
 530         if (!pnpbios_probe_system())
 531                 return -ENODEV;
 532
 533         /* make preparations for bios calls */
 534         pnpbios_calls_init(pnp_bios_install);
 535
 536         /* read the node info */
 537         ret = pnp_bios_dev_node_info(&node_info);
 538         if (ret) {
 539                 printk(KERN_ERR
 540                        "PnPBIOS: Unable to get node info.  Aborting.\n");
 541                 return ret;
 542         }
 543
 544         /* register with the pnp layer */
 545         ret = pnp_register_protocol(&pnpbios_protocol);
 546         if (ret) {
 547                 printk(KERN_ERR
 548                        "PnPBIOS: Unable to register driver.  Aborting.\n");
 549                 return ret;
 550         }
 551
 552         /* start the proc interface */
 553         ret = pnpbios_proc_init();
 554         if (ret)
 555                 printk(KERN_ERR "PnPBIOS: Failed to create proc interface.\n");
 556
 557         /* scan for pnpbios devices */
 558         build_devlist();
 559
 560         pnp_platform_devices = 1;
 561         return 0;
 562 }
 563
 564 fs_initcall(pnpbios_init);
 565
 566 static int __init pnpbios_thread_init(void)
 567 {
 568 #if defined(CONFIG_PPC)
 569         if (check_legacy_ioport(PNPBIOS_BASE))
 570                 return 0;
 571 #endif
 572         if (pnpbios_disabled)
 573                 return 0;
 574 #ifdef CONFIG_HOTPLUG
 575         {
 576                 struct task_struct *task;
 577                 init_completion(&unload_sem);
 578                 task = kthread_run(pnp_dock_thread, NULL, "kpnpbiosd");
 579                 if (IS_ERR(task))
 580                         return PTR_ERR(task);
 581         }
 582 #endif
 583         return 0;
 584 }
 585
 586 /* Start the kernel thread later: */
 587 module_init(pnpbios_thread_init);
 588
 589 EXPORT_SYMBOL(pnpbios_protocol);