core.c revision 9dd78466c956ac4b4f38e12032dc4249ccf57ad1
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 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 89/* 90 * 91 * DOCKING FUNCTIONS 92 * 93 */ 94 95#ifdef CONFIG_HOTPLUG 96 97static int unloading = 0; 98static struct completion unload_sem; 99 100/* 101 * (Much of this belongs in a shared routine somewhere) 102 */ 103 104static 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 */ 158static 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 208static 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 231static 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 260static 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 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 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 421static int pnpbios_disabled; /* = 0 */ 422int pnpbios_dont_use_current_config; /* = 0 */ 423 424#ifndef MODULE 425static 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 453static 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 507static 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 513static 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 535static 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 591subsys_initcall(pnpbios_init); 592 593static 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: */ 616module_init(pnpbios_thread_init); 617 618#else 619 620/* 621 * N.B.: Building pnpbios as a module hasn't been fully implemented 622 */ 623 624MODULE_LICENSE("GPL"); 625 626static 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 639static 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 650module_init(pnpbios_init_all); 651module_exit(pnpbios_exit); 652 653#endif 654 655EXPORT_SYMBOL(pnpbios_protocol); 656