core.c revision 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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 80static union pnp_bios_install_struct * pnp_bios_install = NULL; 81 82int pnp_bios_present(void) 83{ 84 return (pnp_bios_install != NULL); 85} 86 87struct pnp_dev_node_info node_info; 88 89void *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 107static int unloading = 0; 108static struct completion unload_sem; 109 110/* 111 * (Much of this belongs in a shared routine somewhere) 112 */ 113 114static 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 */ 169static 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 225static 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 247static 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 275static 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 298static 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 327struct 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 334static 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 380static 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 429static int pnpbios_disabled; /* = 0 */ 430int pnpbios_dont_use_current_config; /* = 0 */ 431 432#ifndef MODULE 433static 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 461static 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 509static 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 515static 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 537static 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 586subsys_initcall(pnpbios_init); 587 588static 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: */ 605module_init(pnpbios_thread_init); 606 607#else 608 609/* 610 * N.B.: Building pnpbios as a module hasn't been fully implemented 611 */ 612 613MODULE_LICENSE("GPL"); 614 615static 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 628static 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 639module_init(pnpbios_init_all); 640module_exit(pnpbios_exit); 641 642#endif 643 644EXPORT_SYMBOL(pnpbios_protocol); 645