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