core.c revision 86313c488a6848b7ec2ba04e74f25f79dd32a0b7
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 * 77 * PnP BIOS INTERFACE 78 * 79 */ 80 81static union pnp_bios_install_struct * pnp_bios_install = NULL; 82 83int pnp_bios_present(void) 84{ 85 return (pnp_bios_install != NULL); 86} 87 88struct pnp_dev_node_info node_info; 89 90/* 91 * 92 * DOCKING FUNCTIONS 93 * 94 */ 95 96#ifdef CONFIG_HOTPLUG 97 98static int unloading = 0; 99static struct completion unload_sem; 100 101/* 102 * (Much of this belongs in a shared routine somewhere) 103 */ 104 105static int pnp_dock_event(int dock, struct pnp_docking_station_info *info) 106{ 107 char *argv [3], **envp, *buf, *scratch; 108 int i = 0, value; 109 110 if (!current->fs->root) { 111 return -EAGAIN; 112 } 113 if (!(envp = kcalloc(20, sizeof (char *), GFP_KERNEL))) { 114 return -ENOMEM; 115 } 116 if (!(buf = kzalloc(256, GFP_KERNEL))) { 117 kfree (envp); 118 return -ENOMEM; 119 } 120 121 /* FIXME: if there are actual users of this, it should be integrated into 122 * the driver core and use the usual infrastructure like sysfs and uevents */ 123 argv [0] = "/sbin/pnpbios"; 124 argv [1] = "dock"; 125 argv [2] = NULL; 126 127 /* minimal command environment */ 128 envp [i++] = "HOME=/"; 129 envp [i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin"; 130 131#ifdef DEBUG 132 /* hint that policy agent should enter no-stdout debug mode */ 133 envp [i++] = "DEBUG=kernel"; 134#endif 135 /* extensible set of named bus-specific parameters, 136 * supporting multiple driver selection algorithms. 137 */ 138 scratch = buf; 139 140 /* action: add, remove */ 141 envp [i++] = scratch; 142 scratch += sprintf (scratch, "ACTION=%s", dock?"add":"remove") + 1; 143 144 /* Report the ident for the dock */ 145 envp [i++] = scratch; 146 scratch += sprintf (scratch, "DOCK=%x/%x/%x", 147 info->location_id, info->serial, info->capabilities); 148 envp[i] = NULL; 149 150 value = call_usermodehelper (argv [0], argv, envp, UMH_WAIT_EXEC); 151 kfree (buf); 152 kfree (envp); 153 return 0; 154} 155 156/* 157 * Poll the PnP docking at regular intervals 158 */ 159static int pnp_dock_thread(void * unused) 160{ 161 static struct pnp_docking_station_info now; 162 int docked = -1, d = 0; 163 set_freezable(); 164 while (!unloading) 165 { 166 int status; 167 168 /* 169 * Poll every 2 seconds 170 */ 171 msleep_interruptible(2000); 172 173 if (try_to_freeze()) 174 continue; 175 176 status = pnp_bios_dock_station_info(&now); 177 178 switch(status) 179 { 180 /* 181 * No dock to manage 182 */ 183 case PNP_FUNCTION_NOT_SUPPORTED: 184 complete_and_exit(&unload_sem, 0); 185 case PNP_SYSTEM_NOT_DOCKED: 186 d = 0; 187 break; 188 case PNP_SUCCESS: 189 d = 1; 190 break; 191 default: 192 pnpbios_print_status( "pnp_dock_thread", status ); 193 continue; 194 } 195 if(d != docked) 196 { 197 if(pnp_dock_event(d, &now)==0) 198 { 199 docked = d; 200#if 0 201 printk(KERN_INFO "PnPBIOS: Docking station %stached\n", docked?"at":"de"); 202#endif 203 } 204 } 205 } 206 complete_and_exit(&unload_sem, 0); 207} 208 209#endif /* CONFIG_HOTPLUG */ 210 211static int pnpbios_get_resources(struct pnp_dev * dev, struct pnp_resource_table * res) 212{ 213 u8 nodenum = dev->number; 214 struct pnp_bios_node * node; 215 216 /* just in case */ 217 if(!pnpbios_is_dynamic(dev)) 218 return -EPERM; 219 220 node = kzalloc(node_info.max_node_size, GFP_KERNEL); 221 if (!node) 222 return -1; 223 if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_DYNAMIC, node)) { 224 kfree(node); 225 return -ENODEV; 226 } 227 pnpbios_read_resources_from_node(res, node); 228 dev->active = pnp_is_active(dev); 229 kfree(node); 230 return 0; 231} 232 233static int pnpbios_set_resources(struct pnp_dev * dev, struct pnp_resource_table * res) 234{ 235 u8 nodenum = dev->number; 236 struct pnp_bios_node * node; 237 int ret; 238 239 /* just in case */ 240 if (!pnpbios_is_dynamic(dev)) 241 return -EPERM; 242 243 node = kzalloc(node_info.max_node_size, GFP_KERNEL); 244 if (!node) 245 return -1; 246 if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_DYNAMIC, node)) { 247 kfree(node); 248 return -ENODEV; 249 } 250 if(pnpbios_write_resources_to_node(res, node)<0) { 251 kfree(node); 252 return -1; 253 } 254 ret = pnp_bios_set_dev_node(node->handle, (char)PNPMODE_DYNAMIC, node); 255 kfree(node); 256 if (ret > 0) 257 ret = -1; 258 return ret; 259} 260 261static void pnpbios_zero_data_stream(struct pnp_bios_node * node) 262{ 263 unsigned char * p = (char *)node->data; 264 unsigned char * end = (char *)(node->data + node->size); 265 unsigned int len; 266 int i; 267 while ((char *)p < (char *)end) { 268 if(p[0] & 0x80) { /* large tag */ 269 len = (p[2] << 8) | p[1]; 270 p += 3; 271 } else { 272 if (((p[0]>>3) & 0x0f) == 0x0f) 273 return; 274 len = p[0] & 0x07; 275 p += 1; 276 } 277 for (i = 0; i < len; i++) 278 p[i] = 0; 279 p += len; 280 } 281 printk(KERN_ERR "PnPBIOS: Resource structure did not contain an end tag.\n"); 282} 283 284static 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 313struct 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 320static 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 366static 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(&nodenum, (char )PNPMODE_DYNAMIC, node)) 385 break; 386 } else { 387 if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_STATIC, node)) 388 break; 389 } 390 nodes_got++; 391 dev = kzalloc(sizeof (struct pnp_dev), GFP_KERNEL); 392 if (!dev) 393 break; 394 if(insert_device(dev,node)<0) 395 kfree(dev); 396 else 397 devs++; 398 if (nodenum <= thisnodenum) { 399 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); 400 break; 401 } 402 } 403 kfree(node); 404 405 printk(KERN_INFO "PnPBIOS: %i node%s reported by PnP BIOS; %i recorded by driver\n", 406 nodes_got, nodes_got != 1 ? "s" : "", devs); 407} 408 409/* 410 * 411 * INIT AND EXIT 412 * 413 */ 414 415static int pnpbios_disabled; /* = 0 */ 416int pnpbios_dont_use_current_config; /* = 0 */ 417 418#ifndef MODULE 419static int __init pnpbios_setup(char *str) 420{ 421 int invert; 422 423 while ((str != NULL) && (*str != '\0')) { 424 if (strncmp(str, "off", 3) == 0) 425 pnpbios_disabled=1; 426 if (strncmp(str, "on", 2) == 0) 427 pnpbios_disabled=0; 428 invert = (strncmp(str, "no-", 3) == 0); 429 if (invert) 430 str += 3; 431 if (strncmp(str, "curr", 4) == 0) 432 pnpbios_dont_use_current_config = invert; 433 str = strchr(str, ','); 434 if (str != NULL) 435 str += strspn(str, ", \t"); 436 } 437 438 return 1; 439} 440 441__setup("pnpbios=", pnpbios_setup); 442#endif 443 444/* PnP BIOS signature: "$PnP" */ 445#define PNP_SIGNATURE (('$' << 0) + ('P' << 8) + ('n' << 16) + ('P' << 24)) 446 447static int __init pnpbios_probe_system(void) 448{ 449 union pnp_bios_install_struct *check; 450 u8 sum; 451 int length, i; 452 453 printk(KERN_INFO "PnPBIOS: Scanning system for PnP BIOS support...\n"); 454 455 /* 456 * Search the defined area (0xf0000-0xffff0) for a valid PnP BIOS 457 * structure and, if one is found, sets up the selectors and 458 * entry points 459 */ 460 for (check = (union pnp_bios_install_struct *) __va(0xf0000); 461 check < (union pnp_bios_install_struct *) __va(0xffff0); 462 check = (void *)check + 16) { 463 if (check->fields.signature != PNP_SIGNATURE) 464 continue; 465 printk(KERN_INFO "PnPBIOS: Found PnP BIOS installation structure at 0x%p\n", check); 466 length = check->fields.length; 467 if (!length) { 468 printk(KERN_ERR "PnPBIOS: installation structure is invalid, skipping\n"); 469 continue; 470 } 471 for (sum = 0, i = 0; i < length; i++) 472 sum += check->chars[i]; 473 if (sum) { 474 printk(KERN_ERR "PnPBIOS: installation structure is corrupted, skipping\n"); 475 continue; 476 } 477 if (check->fields.version < 0x10) { 478 printk(KERN_WARNING "PnPBIOS: PnP BIOS version %d.%d is not supported\n", 479 check->fields.version >> 4, 480 check->fields.version & 15); 481 continue; 482 } 483 printk(KERN_INFO "PnPBIOS: PnP BIOS version %d.%d, entry 0x%x:0x%x, dseg 0x%x\n", 484 check->fields.version >> 4, check->fields.version & 15, 485 check->fields.pm16cseg, check->fields.pm16offset, 486 check->fields.pm16dseg); 487 pnp_bios_install = check; 488 return 1; 489 } 490 491 printk(KERN_INFO "PnPBIOS: PnP BIOS support was not detected.\n"); 492 return 0; 493} 494 495static int __init exploding_pnp_bios(struct dmi_system_id *d) 496{ 497 printk(KERN_WARNING "%s detected. Disabling PnPBIOS\n", d->ident); 498 return 0; 499} 500 501static struct dmi_system_id pnpbios_dmi_table[] __initdata = { 502 { /* PnPBIOS GPF on boot */ 503 .callback = exploding_pnp_bios, 504 .ident = "Higraded P14H", 505 .matches = { 506 DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."), 507 DMI_MATCH(DMI_BIOS_VERSION, "07.00T"), 508 DMI_MATCH(DMI_SYS_VENDOR, "Higraded"), 509 DMI_MATCH(DMI_PRODUCT_NAME, "P14H"), 510 }, 511 }, 512 { /* PnPBIOS GPF on boot */ 513 .callback = exploding_pnp_bios, 514 .ident = "ASUS P4P800", 515 .matches = { 516 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer Inc."), 517 DMI_MATCH(DMI_BOARD_NAME, "P4P800"), 518 }, 519 }, 520 { } 521}; 522 523static int __init pnpbios_init(void) 524{ 525 int ret; 526 527#if defined(CONFIG_PPC_MERGE) 528 if (check_legacy_ioport(PNPBIOS_BASE)) 529 return -ENODEV; 530#endif 531 if (pnpbios_disabled || dmi_check_system(pnpbios_dmi_table) || 532 paravirt_enabled()) { 533 printk(KERN_INFO "PnPBIOS: Disabled\n"); 534 return -ENODEV; 535 } 536 537#ifdef CONFIG_PNPACPI 538 if (!acpi_disabled && !pnpacpi_disabled) { 539 pnpbios_disabled = 1; 540 printk(KERN_INFO "PnPBIOS: Disabled by ACPI PNP\n"); 541 return -ENODEV; 542 } 543#endif /* CONFIG_ACPI */ 544 545 /* scan the system for pnpbios support */ 546 if (!pnpbios_probe_system()) 547 return -ENODEV; 548 549 /* make preparations for bios calls */ 550 pnpbios_calls_init(pnp_bios_install); 551 552 /* read the node info */ 553 ret = pnp_bios_dev_node_info(&node_info); 554 if (ret) { 555 printk(KERN_ERR "PnPBIOS: Unable to get node info. Aborting.\n"); 556 return ret; 557 } 558 559 /* register with the pnp layer */ 560 ret = pnp_register_protocol(&pnpbios_protocol); 561 if (ret) { 562 printk(KERN_ERR "PnPBIOS: Unable to register driver. Aborting.\n"); 563 return ret; 564 } 565 566 /* start the proc interface */ 567 ret = pnpbios_proc_init(); 568 if (ret) 569 printk(KERN_ERR "PnPBIOS: Failed to create proc interface.\n"); 570 571 /* scan for pnpbios devices */ 572 build_devlist(); 573 574 pnp_platform_devices = 1; 575 return 0; 576} 577 578subsys_initcall(pnpbios_init); 579 580static int __init pnpbios_thread_init(void) 581{ 582 struct task_struct *task; 583#if defined(CONFIG_PPC_MERGE) 584 if (check_legacy_ioport(PNPBIOS_BASE)) 585 return 0; 586#endif 587 if (pnpbios_disabled) 588 return 0; 589#ifdef CONFIG_HOTPLUG 590 init_completion(&unload_sem); 591 task = kthread_run(pnp_dock_thread, NULL, "kpnpbiosd"); 592 if (!IS_ERR(task)) 593 unloading = 0; 594#endif 595 return 0; 596} 597 598#ifndef MODULE 599 600/* init/main.c calls pnpbios_init early */ 601 602/* Start the kernel thread later: */ 603module_init(pnpbios_thread_init); 604 605#else 606 607/* 608 * N.B.: Building pnpbios as a module hasn't been fully implemented 609 */ 610 611MODULE_LICENSE("GPL"); 612 613static int __init pnpbios_init_all(void) 614{ 615 int r; 616 617 r = pnpbios_init(); 618 if (r) 619 return r; 620 r = pnpbios_thread_init(); 621 if (r) 622 return r; 623 return 0; 624} 625 626static void __exit pnpbios_exit(void) 627{ 628#ifdef CONFIG_HOTPLUG 629 unloading = 1; 630 wait_for_completion(&unload_sem); 631#endif 632 pnpbios_proc_exit(); 633 /* We ought to free resources here */ 634 return; 635} 636 637module_init(pnpbios_init_all); 638module_exit(pnpbios_exit); 639 640#endif 641 642EXPORT_SYMBOL(pnpbios_protocol); 643