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