core.c revision 034382117725f6b6b26fbb138498139c5c012c1b
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 65#include <asm/page.h> 66#include <asm/desc.h> 67#include <asm/system.h> 68#include <asm/byteorder.h> 69 70#include "pnpbios.h" 71 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 94#ifdef CONFIG_HOTPLUG 95 96static int unloading = 0; 97static struct completion unload_sem; 98 99/* 100 * (Much of this belongs in a shared routine somewhere) 101 */ 102 103static int pnp_dock_event(int dock, struct pnp_docking_station_info *info) 104{ 105 char *argv [3], **envp, *buf, *scratch; 106 int i = 0, value; 107 108 if (!current->fs->root) { 109 return -EAGAIN; 110 } 111 if (!(envp = (char **) kcalloc (20, sizeof (char *), GFP_KERNEL))) { 112 return -ENOMEM; 113 } 114 if (!(buf = kcalloc (1, 256, GFP_KERNEL))) { 115 kfree (envp); 116 return -ENOMEM; 117 } 118 119 /* FIXME: if there are actual users of this, it should be integrated into 120 * the driver core and use the usual infrastructure like sysfs and uevents */ 121 argv [0] = "/sbin/pnpbios"; 122 argv [1] = "dock"; 123 argv [2] = NULL; 124 125 /* minimal command environment */ 126 envp [i++] = "HOME=/"; 127 envp [i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin"; 128 129#ifdef DEBUG 130 /* hint that policy agent should enter no-stdout debug mode */ 131 envp [i++] = "DEBUG=kernel"; 132#endif 133 /* extensible set of named bus-specific parameters, 134 * supporting multiple driver selection algorithms. 135 */ 136 scratch = buf; 137 138 /* action: add, remove */ 139 envp [i++] = scratch; 140 scratch += sprintf (scratch, "ACTION=%s", dock?"add":"remove") + 1; 141 142 /* Report the ident for the dock */ 143 envp [i++] = scratch; 144 scratch += sprintf (scratch, "DOCK=%x/%x/%x", 145 info->location_id, info->serial, info->capabilities); 146 envp[i] = NULL; 147 148 value = call_usermodehelper (argv [0], argv, envp, 0); 149 kfree (buf); 150 kfree (envp); 151 return 0; 152} 153 154/* 155 * Poll the PnP docking at regular intervals 156 */ 157static int pnp_dock_thread(void * unused) 158{ 159 static struct pnp_docking_station_info now; 160 int docked = -1, d = 0; 161 daemonize("kpnpbiosd"); 162 allow_signal(SIGKILL); 163 while(!unloading && !signal_pending(current)) 164 { 165 int status; 166 167 /* 168 * Poll every 2 seconds 169 */ 170 msleep_interruptible(2000); 171 172 if(signal_pending(current)) { 173 if (try_to_freeze()) 174 continue; 175 break; 176 } 177 178 status = pnp_bios_dock_station_info(&now); 179 180 switch(status) 181 { 182 /* 183 * No dock to manage 184 */ 185 case PNP_FUNCTION_NOT_SUPPORTED: 186 complete_and_exit(&unload_sem, 0); 187 case PNP_SYSTEM_NOT_DOCKED: 188 d = 0; 189 break; 190 case PNP_SUCCESS: 191 d = 1; 192 break; 193 default: 194 pnpbios_print_status( "pnp_dock_thread", status ); 195 continue; 196 } 197 if(d != docked) 198 { 199 if(pnp_dock_event(d, &now)==0) 200 { 201 docked = d; 202#if 0 203 printk(KERN_INFO "PnPBIOS: Docking station %stached\n", docked?"at":"de"); 204#endif 205 } 206 } 207 } 208 complete_and_exit(&unload_sem, 0); 209} 210 211#endif /* CONFIG_HOTPLUG */ 212 213static int pnpbios_get_resources(struct pnp_dev * dev, struct pnp_resource_table * res) 214{ 215 u8 nodenum = dev->number; 216 struct pnp_bios_node * node; 217 218 /* just in case */ 219 if(!pnpbios_is_dynamic(dev)) 220 return -EPERM; 221 222 node = kcalloc(1, node_info.max_node_size, GFP_KERNEL); 223 if (!node) 224 return -1; 225 if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_DYNAMIC, node)) { 226 kfree(node); 227 return -ENODEV; 228 } 229 pnpbios_read_resources_from_node(res, node); 230 dev->active = pnp_is_active(dev); 231 kfree(node); 232 return 0; 233} 234 235static int pnpbios_set_resources(struct pnp_dev * dev, struct pnp_resource_table * res) 236{ 237 u8 nodenum = dev->number; 238 struct pnp_bios_node * node; 239 int ret; 240 241 /* just in case */ 242 if (!pnpbios_is_dynamic(dev)) 243 return -EPERM; 244 245 node = kcalloc(1, node_info.max_node_size, GFP_KERNEL); 246 if (!node) 247 return -1; 248 if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_DYNAMIC, node)) { 249 kfree(node); 250 return -ENODEV; 251 } 252 if(pnpbios_write_resources_to_node(res, node)<0) { 253 kfree(node); 254 return -1; 255 } 256 ret = pnp_bios_set_dev_node(node->handle, (char)PNPMODE_DYNAMIC, node); 257 kfree(node); 258 if (ret > 0) 259 ret = -1; 260 return ret; 261} 262 263static void pnpbios_zero_data_stream(struct pnp_bios_node * node) 264{ 265 unsigned char * p = (char *)node->data; 266 unsigned char * end = (char *)(node->data + node->size); 267 unsigned int len; 268 int i; 269 while ((char *)p < (char *)end) { 270 if(p[0] & 0x80) { /* large tag */ 271 len = (p[2] << 8) | p[1]; 272 p += 3; 273 } else { 274 if (((p[0]>>3) & 0x0f) == 0x0f) 275 return; 276 len = p[0] & 0x07; 277 p += 1; 278 } 279 for (i = 0; i < len; i++) 280 p[i] = 0; 281 p += len; 282 } 283 printk(KERN_ERR "PnPBIOS: Resource structure did not contain an end tag.\n"); 284} 285 286static int pnpbios_disable_resources(struct pnp_dev *dev) 287{ 288 struct pnp_bios_node * node; 289 u8 nodenum = dev->number; 290 int ret; 291 292 /* just in case */ 293 if(dev->flags & PNPBIOS_NO_DISABLE || !pnpbios_is_dynamic(dev)) 294 return -EPERM; 295 296 node = kcalloc(1, node_info.max_node_size, GFP_KERNEL); 297 if (!node) 298 return -ENOMEM; 299 300 if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_DYNAMIC, node)) { 301 kfree(node); 302 return -ENODEV; 303 } 304 pnpbios_zero_data_stream(node); 305 306 ret = pnp_bios_set_dev_node(dev->number, (char)PNPMODE_DYNAMIC, node); 307 kfree(node); 308 if (ret > 0) 309 ret = -1; 310 return ret; 311} 312 313/* PnP Layer support */ 314 315struct pnp_protocol pnpbios_protocol = { 316 .name = "Plug and Play BIOS", 317 .get = pnpbios_get_resources, 318 .set = pnpbios_set_resources, 319 .disable = pnpbios_disable_resources, 320}; 321 322static int insert_device(struct pnp_dev *dev, struct pnp_bios_node * node) 323{ 324 struct list_head * pos; 325 struct pnp_dev * pnp_dev; 326 struct pnp_id *dev_id; 327 char id[8]; 328 329 /* check if the device is already added */ 330 dev->number = node->handle; 331 list_for_each (pos, &pnpbios_protocol.devices){ 332 pnp_dev = list_entry(pos, struct pnp_dev, protocol_list); 333 if (dev->number == pnp_dev->number) 334 return -1; 335 } 336 337 /* set the initial values for the PnP device */ 338 dev_id = kcalloc(1, sizeof(struct pnp_id), GFP_KERNEL); 339 if (!dev_id) 340 return -1; 341 pnpid32_to_pnpid(node->eisa_id,id); 342 memcpy(dev_id->id,id,7); 343 pnp_add_id(dev_id, dev); 344 pnpbios_parse_data_stream(dev, node); 345 dev->active = pnp_is_active(dev); 346 dev->flags = node->flags; 347 if (!(dev->flags & PNPBIOS_NO_CONFIG)) 348 dev->capabilities |= PNP_CONFIGURABLE; 349 if (!(dev->flags & PNPBIOS_NO_DISABLE)) 350 dev->capabilities |= PNP_DISABLE; 351 dev->capabilities |= PNP_READ; 352 if (pnpbios_is_dynamic(dev)) 353 dev->capabilities |= PNP_WRITE; 354 if (dev->flags & PNPBIOS_REMOVABLE) 355 dev->capabilities |= PNP_REMOVABLE; 356 dev->protocol = &pnpbios_protocol; 357 358 /* clear out the damaged flags */ 359 if (!dev->active) 360 pnp_init_resource_table(&dev->res); 361 362 pnp_add_device(dev); 363 pnpbios_interface_attach_device(node); 364 365 return 0; 366} 367 368static void __init build_devlist(void) 369{ 370 u8 nodenum; 371 unsigned int nodes_got = 0; 372 unsigned int devs = 0; 373 struct pnp_bios_node *node; 374 struct pnp_dev *dev; 375 376 node = kcalloc(1, node_info.max_node_size, GFP_KERNEL); 377 if (!node) 378 return; 379 380 for(nodenum=0; nodenum<0xff; ) { 381 u8 thisnodenum = nodenum; 382 /* eventually we will want to use PNPMODE_STATIC here but for now 383 * dynamic will help us catch buggy bioses to add to the blacklist. 384 */ 385 if (!pnpbios_dont_use_current_config) { 386 if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_DYNAMIC, node)) 387 break; 388 } else { 389 if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_STATIC, node)) 390 break; 391 } 392 nodes_got++; 393 dev = kcalloc(1, 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 "PnPBIOS: build_devlist: Node number 0x%x is out of sequence following node 0x%x. Aborting.\n", (unsigned int)nodenum, (unsigned int)thisnodenum); 402 break; 403 } 404 } 405 kfree(node); 406 407 printk(KERN_INFO "PnPBIOS: %i node%s reported by PnP BIOS; %i recorded by driver\n", 408 nodes_got, nodes_got != 1 ? "s" : "", devs); 409} 410 411/* 412 * 413 * INIT AND EXIT 414 * 415 */ 416 417static int pnpbios_disabled; /* = 0 */ 418int pnpbios_dont_use_current_config; /* = 0 */ 419 420#ifndef MODULE 421static int __init pnpbios_setup(char *str) 422{ 423 int invert; 424 425 while ((str != NULL) && (*str != '\0')) { 426 if (strncmp(str, "off", 3) == 0) 427 pnpbios_disabled=1; 428 if (strncmp(str, "on", 2) == 0) 429 pnpbios_disabled=0; 430 invert = (strncmp(str, "no-", 3) == 0); 431 if (invert) 432 str += 3; 433 if (strncmp(str, "curr", 4) == 0) 434 pnpbios_dont_use_current_config = invert; 435 str = strchr(str, ','); 436 if (str != NULL) 437 str += strspn(str, ", \t"); 438 } 439 440 return 1; 441} 442 443__setup("pnpbios=", pnpbios_setup); 444#endif 445 446/* PnP BIOS signature: "$PnP" */ 447#define PNP_SIGNATURE (('$' << 0) + ('P' << 8) + ('n' << 16) + ('P' << 24)) 448 449static int __init pnpbios_probe_system(void) 450{ 451 union pnp_bios_install_struct *check; 452 u8 sum; 453 int length, i; 454 455 printk(KERN_INFO "PnPBIOS: Scanning system for PnP BIOS support...\n"); 456 457 /* 458 * Search the defined area (0xf0000-0xffff0) for a valid PnP BIOS 459 * structure and, if one is found, sets up the selectors and 460 * entry points 461 */ 462 for (check = (union pnp_bios_install_struct *) __va(0xf0000); 463 check < (union pnp_bios_install_struct *) __va(0xffff0); 464 check = (void *)check + 16) { 465 if (check->fields.signature != PNP_SIGNATURE) 466 continue; 467 printk(KERN_INFO "PnPBIOS: Found PnP BIOS installation structure at 0x%p\n", check); 468 length = check->fields.length; 469 if (!length) { 470 printk(KERN_ERR "PnPBIOS: installation structure is invalid, skipping\n"); 471 continue; 472 } 473 for (sum = 0, i = 0; i < length; i++) 474 sum += check->chars[i]; 475 if (sum) { 476 printk(KERN_ERR "PnPBIOS: installation structure is corrupted, skipping\n"); 477 continue; 478 } 479 if (check->fields.version < 0x10) { 480 printk(KERN_WARNING "PnPBIOS: PnP BIOS version %d.%d is not supported\n", 481 check->fields.version >> 4, 482 check->fields.version & 15); 483 continue; 484 } 485 printk(KERN_INFO "PnPBIOS: PnP BIOS version %d.%d, entry 0x%x:0x%x, dseg 0x%x\n", 486 check->fields.version >> 4, check->fields.version & 15, 487 check->fields.pm16cseg, check->fields.pm16offset, 488 check->fields.pm16dseg); 489 pnp_bios_install = check; 490 return 1; 491 } 492 493 printk(KERN_INFO "PnPBIOS: PnP BIOS support was not detected.\n"); 494 return 0; 495} 496 497static int __init exploding_pnp_bios(struct dmi_system_id *d) 498{ 499 printk(KERN_WARNING "%s detected. Disabling PnPBIOS\n", d->ident); 500 return 0; 501} 502 503static struct dmi_system_id pnpbios_dmi_table[] __initdata = { 504 { /* PnPBIOS GPF on boot */ 505 .callback = exploding_pnp_bios, 506 .ident = "Higraded P14H", 507 .matches = { 508 DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."), 509 DMI_MATCH(DMI_BIOS_VERSION, "07.00T"), 510 DMI_MATCH(DMI_SYS_VENDOR, "Higraded"), 511 DMI_MATCH(DMI_PRODUCT_NAME, "P14H"), 512 }, 513 }, 514 { /* PnPBIOS GPF on boot */ 515 .callback = exploding_pnp_bios, 516 .ident = "ASUS P4P800", 517 .matches = { 518 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer Inc."), 519 DMI_MATCH(DMI_BOARD_NAME, "P4P800"), 520 }, 521 }, 522 { } 523}; 524 525static int __init pnpbios_init(void) 526{ 527 int ret; 528 529 if (pnpbios_disabled || dmi_check_system(pnpbios_dmi_table)) { 530 printk(KERN_INFO "PnPBIOS: Disabled\n"); 531 return -ENODEV; 532 } 533 534#ifdef CONFIG_PNPACPI 535 if (!acpi_disabled && !pnpacpi_disabled) { 536 pnpbios_disabled = 1; 537 printk(KERN_INFO "PnPBIOS: Disabled by ACPI PNP\n"); 538 return -ENODEV; 539 } 540#endif /* CONFIG_ACPI */ 541 542 /* scan the system for pnpbios support */ 543 if (!pnpbios_probe_system()) 544 return -ENODEV; 545 546 /* make preparations for bios calls */ 547 pnpbios_calls_init(pnp_bios_install); 548 549 /* read the node info */ 550 ret = pnp_bios_dev_node_info(&node_info); 551 if (ret) { 552 printk(KERN_ERR "PnPBIOS: Unable to get node info. Aborting.\n"); 553 return ret; 554 } 555 556 /* register with the pnp layer */ 557 ret = pnp_register_protocol(&pnpbios_protocol); 558 if (ret) { 559 printk(KERN_ERR "PnPBIOS: Unable to register driver. Aborting.\n"); 560 return ret; 561 } 562 563 /* start the proc interface */ 564 ret = pnpbios_proc_init(); 565 if (ret) 566 printk(KERN_ERR "PnPBIOS: Failed to create proc interface.\n"); 567 568 /* scan for pnpbios devices */ 569 build_devlist(); 570 571 return 0; 572} 573 574subsys_initcall(pnpbios_init); 575 576static int __init pnpbios_thread_init(void) 577{ 578 if (pnpbios_disabled) 579 return 0; 580#ifdef CONFIG_HOTPLUG 581 init_completion(&unload_sem); 582 if (kernel_thread(pnp_dock_thread, NULL, CLONE_KERNEL) > 0) 583 unloading = 0; 584#endif 585 return 0; 586} 587 588#ifndef MODULE 589 590/* init/main.c calls pnpbios_init early */ 591 592/* Start the kernel thread later: */ 593module_init(pnpbios_thread_init); 594 595#else 596 597/* 598 * N.B.: Building pnpbios as a module hasn't been fully implemented 599 */ 600 601MODULE_LICENSE("GPL"); 602 603static int __init pnpbios_init_all(void) 604{ 605 int r; 606 607 r = pnpbios_init(); 608 if (r) 609 return r; 610 r = pnpbios_thread_init(); 611 if (r) 612 return r; 613 return 0; 614} 615 616static void __exit pnpbios_exit(void) 617{ 618#ifdef CONFIG_HOTPLUG 619 unloading = 1; 620 wait_for_completion(&unload_sem); 621#endif 622 pnpbios_proc_exit(); 623 /* We ought to free resources here */ 624 return; 625} 626 627module_init(pnpbios_init_all); 628module_exit(pnpbios_exit); 629 630#endif 631 632EXPORT_SYMBOL(pnpbios_protocol); 633