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 80 static union pnp_bios_install_struct * pnp_bios_install = NULL; 81 82 int pnp_bios_present(void) 83 { 84 return (pnp_bios_install != NULL); 85 } 86 87 struct pnp_dev_node_info node_info; 88 89 /* 90 * 91 * DOCKING FUNCTIONS 92 * 93 */ 94 95 #ifdef CONFIG_HOTPLUG 96 97 static int unloading = 0; 98 static struct completion unload_sem; 99 100 /* 101 * (Much of this belongs in a shared routine somewhere) 102 */ 103 104 static 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 (!hotplug_path [0]) 110 return -ENOENT; 111 if (!current->fs->root) { 112 return -EAGAIN; 113 } 114 if (!(envp = (char **) kcalloc (20, sizeof (char *), GFP_KERNEL))) { 115 return -ENOMEM; 116 } 117 if (!(buf = kcalloc (1, 256, GFP_KERNEL))) { 118 kfree (envp); 119 return -ENOMEM; 120 } 121 122 /* only one standardized param to hotplug command: type */ 123 argv [0] = hotplug_path; 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, 0); 151 kfree (buf); 152 kfree (envp); 153 return 0; 154 } 155 156 /* 157 * Poll the PnP docking at regular intervals 158 */ 159 static int pnp_dock_thread(void * unused) 160 { 161 static struct pnp_docking_station_info now; 162 int docked = -1, d = 0; 163 daemonize("kpnpbiosd"); 164 allow_signal(SIGKILL); 165 while(!unloading && !signal_pending(current)) 166 { 167 int status; 168 169 /* 170 * Poll every 2 seconds 171 */ 172 msleep_interruptible(2000); 173 174 if(signal_pending(current)) { 175 if (try_to_freeze()) 176 continue; 177 break; 178 } 179 180 status = pnp_bios_dock_station_info(&now); 181 182 switch(status) 183 { 184 /* 185 * No dock to manage 186 */ 187 case PNP_FUNCTION_NOT_SUPPORTED: 188 complete_and_exit(&unload_sem, 0); 189 case PNP_SYSTEM_NOT_DOCKED: 190 d = 0; 191 break; 192 case PNP_SUCCESS: 193 d = 1; 194 break; 195 default: 196 pnpbios_print_status( "pnp_dock_thread", status ); 197 continue; 198 } 199 if(d != docked) 200 { 201 if(pnp_dock_event(d, &now)==0) 202 { 203 docked = d; 204 #if 0 205 printk(KERN_INFO "PnPBIOS: Docking station %stached\n", docked?"at":"de"); 206 #endif 207 } 208 } 209 } 210 complete_and_exit(&unload_sem, 0); 211 } 212 213 #endif /* CONFIG_HOTPLUG */ 214 215 static int pnpbios_get_resources(struct pnp_dev * dev, struct pnp_resource_table * res) 216 { 217 u8 nodenum = dev->number; 218 struct pnp_bios_node * node; 219 220 /* just in case */ 221 if(!pnpbios_is_dynamic(dev)) 222 return -EPERM; 223 224 node = kcalloc(1, node_info.max_node_size, GFP_KERNEL); 225 if (!node) 226 return -1; 227 if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_DYNAMIC, node)) { 228 kfree(node); 229 return -ENODEV; 230 } 231 pnpbios_read_resources_from_node(res, node); 232 dev->active = pnp_is_active(dev); 233 kfree(node); 234 return 0; 235 } 236 237 static int pnpbios_set_resources(struct pnp_dev * dev, struct pnp_resource_table * res) 238 { 239 u8 nodenum = dev->number; 240 struct pnp_bios_node * node; 241 int ret; 242 243 /* just in case */ 244 if (!pnpbios_is_dynamic(dev)) 245 return -EPERM; 246 247 node = kcalloc(1, node_info.max_node_size, GFP_KERNEL); 248 if (!node) 249 return -1; 250 if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_DYNAMIC, node)) { 251 kfree(node); 252 return -ENODEV; 253 } 254 if(pnpbios_write_resources_to_node(res, node)<0) { 255 kfree(node); 256 return -1; 257 } 258 ret = pnp_bios_set_dev_node(node->handle, (char)PNPMODE_DYNAMIC, node); 259 kfree(node); 260 if (ret > 0) 261 ret = -1; 262 return ret; 263 } 264 265 static void pnpbios_zero_data_stream(struct pnp_bios_node * node) 266 { 267 unsigned char * p = (char *)node->data; 268 unsigned char * end = (char *)(node->data + node->size); 269 unsigned int len; 270 int i; 271 while ((char *)p < (char *)end) { 272 if(p[0] & 0x80) { /* large tag */ 273 len = (p[2] << 8) | p[1]; 274 p += 3; 275 } else { 276 if (((p[0]>>3) & 0x0f) == 0x0f) 277 return; 278 len = p[0] & 0x07; 279 p += 1; 280 } 281 for (i = 0; i < len; i++) 282 p[i] = 0; 283 p += len; 284 } 285 printk(KERN_ERR "PnPBIOS: Resource structure did not contain an end tag.\n"); 286 } 287 288 static int pnpbios_disable_resources(struct pnp_dev *dev) 289 { 290 struct pnp_bios_node * node; 291 u8 nodenum = dev->number; 292 int ret; 293 294 /* just in case */ 295 if(dev->flags & PNPBIOS_NO_DISABLE || !pnpbios_is_dynamic(dev)) 296 return -EPERM; 297 298 node = kcalloc(1, node_info.max_node_size, GFP_KERNEL); 299 if (!node) 300 return -ENOMEM; 301 302 if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_DYNAMIC, node)) { 303 kfree(node); 304 return -ENODEV; 305 } 306 pnpbios_zero_data_stream(node); 307 308 ret = pnp_bios_set_dev_node(dev->number, (char)PNPMODE_DYNAMIC, node); 309 kfree(node); 310 if (ret > 0) 311 ret = -1; 312 return ret; 313 } 314 315 /* PnP Layer support */ 316 317 struct pnp_protocol pnpbios_protocol = { 318 .name = "Plug and Play BIOS", 319 .get = pnpbios_get_resources, 320 .set = pnpbios_set_resources, 321 .disable = pnpbios_disable_resources, 322 }; 323 324 static int insert_device(struct pnp_dev *dev, struct pnp_bios_node * node) 325 { 326 struct list_head * pos; 327 struct pnp_dev * pnp_dev; 328 struct pnp_id *dev_id; 329 char id[8]; 330 331 /* check if the device is already added */ 332 dev->number = node->handle; 333 list_for_each (pos, &pnpbios_protocol.devices){ 334 pnp_dev = list_entry(pos, struct pnp_dev, protocol_list); 335 if (dev->number == pnp_dev->number) 336 return -1; 337 } 338 339 /* set the initial values for the PnP device */ 340 dev_id = kcalloc(1, sizeof(struct pnp_id), GFP_KERNEL); 341 if (!dev_id) 342 return -1; 343 pnpid32_to_pnpid(node->eisa_id,id); 344 memcpy(dev_id->id,id,7); 345 pnp_add_id(dev_id, dev); 346 pnpbios_parse_data_stream(dev, node); 347 dev->active = pnp_is_active(dev); 348 dev->flags = node->flags; 349 if (!(dev->flags & PNPBIOS_NO_CONFIG)) 350 dev->capabilities |= PNP_CONFIGURABLE; 351 if (!(dev->flags & PNPBIOS_NO_DISABLE)) 352 dev->capabilities |= PNP_DISABLE; 353 dev->capabilities |= PNP_READ; 354 if (pnpbios_is_dynamic(dev)) 355 dev->capabilities |= PNP_WRITE; 356 if (dev->flags & PNPBIOS_REMOVABLE) 357 dev->capabilities |= PNP_REMOVABLE; 358 dev->protocol = &pnpbios_protocol; 359 360 /* clear out the damaged flags */ 361 if (!dev->active) 362 pnp_init_resource_table(&dev->res); 363 364 pnp_add_device(dev); 365 pnpbios_interface_attach_device(node); 366 367 return 0; 368 } 369 370 static void __init build_devlist(void) 371 { 372 u8 nodenum; 373 unsigned int nodes_got = 0; 374 unsigned int devs = 0; 375 struct pnp_bios_node *node; 376 struct pnp_dev *dev; 377 378 node = kcalloc(1, node_info.max_node_size, GFP_KERNEL); 379 if (!node) 380 return; 381 382 for(nodenum=0; nodenum<0xff; ) { 383 u8 thisnodenum = nodenum; 384 /* eventually we will want to use PNPMODE_STATIC here but for now 385 * dynamic will help us catch buggy bioses to add to the blacklist. 386 */ 387 if (!pnpbios_dont_use_current_config) { 388 if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_DYNAMIC, node)) 389 break; 390 } else { 391 if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_STATIC, node)) 392 break; 393 } 394 nodes_got++; 395 dev = kcalloc(1, sizeof (struct pnp_dev), GFP_KERNEL); 396 if (!dev) 397 break; 398 if(insert_device(dev,node)<0) 399 kfree(dev); 400 else 401 devs++; 402 if (nodenum <= thisnodenum) { 403 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); 404 break; 405 } 406 } 407 kfree(node); 408 409 printk(KERN_INFO "PnPBIOS: %i node%s reported by PnP BIOS; %i recorded by driver\n", 410 nodes_got, nodes_got != 1 ? "s" : "", devs); 411 } 412 413 /* 414 * 415 * INIT AND EXIT 416 * 417 */ 418 419 static int pnpbios_disabled; /* = 0 */ 420 int pnpbios_dont_use_current_config; /* = 0 */ 421 422 #ifndef MODULE 423 static int __init pnpbios_setup(char *str) 424 { 425 int invert; 426 427 while ((str != NULL) && (*str != '\0')) { 428 if (strncmp(str, "off", 3) == 0) 429 pnpbios_disabled=1; 430 if (strncmp(str, "on", 2) == 0) 431 pnpbios_disabled=0; 432 invert = (strncmp(str, "no-", 3) == 0); 433 if (invert) 434 str += 3; 435 if (strncmp(str, "curr", 4) == 0) 436 pnpbios_dont_use_current_config = invert; 437 str = strchr(str, ','); 438 if (str != NULL) 439 str += strspn(str, ", \t"); 440 } 441 442 return 1; 443 } 444 445 __setup("pnpbios=", pnpbios_setup); 446 #endif 447 448 /* PnP BIOS signature: "$PnP" */ 449 #define PNP_SIGNATURE (('$' << 0) + ('P' << 8) + ('n' << 16) + ('P' << 24)) 450 451 static int __init pnpbios_probe_system(void) 452 { 453 union pnp_bios_install_struct *check; 454 u8 sum; 455 int length, i; 456 457 printk(KERN_INFO "PnPBIOS: Scanning system for PnP BIOS support...\n"); 458 459 /* 460 * Search the defined area (0xf0000-0xffff0) for a valid PnP BIOS 461 * structure and, if one is found, sets up the selectors and 462 * entry points 463 */ 464 for (check = (union pnp_bios_install_struct *) __va(0xf0000); 465 check < (union pnp_bios_install_struct *) __va(0xffff0); 466 check = (void *)check + 16) { 467 if (check->fields.signature != PNP_SIGNATURE) 468 continue; 469 printk(KERN_INFO "PnPBIOS: Found PnP BIOS installation structure at 0x%p\n", check); 470 length = check->fields.length; 471 if (!length) { 472 printk(KERN_ERR "PnPBIOS: installation structure is invalid, skipping\n"); 473 continue; 474 } 475 for (sum = 0, i = 0; i < length; i++) 476 sum += check->chars[i]; 477 if (sum) { 478 printk(KERN_ERR "PnPBIOS: installation structure is corrupted, skipping\n"); 479 continue; 480 } 481 if (check->fields.version < 0x10) { 482 printk(KERN_WARNING "PnPBIOS: PnP BIOS version %d.%d is not supported\n", 483 check->fields.version >> 4, 484 check->fields.version & 15); 485 continue; 486 } 487 printk(KERN_INFO "PnPBIOS: PnP BIOS version %d.%d, entry 0x%x:0x%x, dseg 0x%x\n", 488 check->fields.version >> 4, check->fields.version & 15, 489 check->fields.pm16cseg, check->fields.pm16offset, 490 check->fields.pm16dseg); 491 pnp_bios_install = check; 492 return 1; 493 } 494 495 printk(KERN_INFO "PnPBIOS: PnP BIOS support was not detected.\n"); 496 return 0; 497 } 498 499 static int __init exploding_pnp_bios(struct dmi_system_id *d) 500 { 501 printk(KERN_WARNING "%s detected. Disabling PnPBIOS\n", d->ident); 502 return 0; 503 } 504 505 static struct dmi_system_id pnpbios_dmi_table[] __initdata = { 506 { /* PnPBIOS GPF on boot */ 507 .callback = exploding_pnp_bios, 508 .ident = "Higraded P14H", 509 .matches = { 510 DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."), 511 DMI_MATCH(DMI_BIOS_VERSION, "07.00T"), 512 DMI_MATCH(DMI_SYS_VENDOR, "Higraded"), 513 DMI_MATCH(DMI_PRODUCT_NAME, "P14H"), 514 }, 515 }, 516 { /* PnPBIOS GPF on boot */ 517 .callback = exploding_pnp_bios, 518 .ident = "ASUS P4P800", 519 .matches = { 520 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer Inc."), 521 DMI_MATCH(DMI_BOARD_NAME, "P4P800"), 522 }, 523 }, 524 { } 525 }; 526 527 static int __init pnpbios_init(void) 528 { 529 int ret; 530 531 if (pnpbios_disabled || dmi_check_system(pnpbios_dmi_table)) { 532 printk(KERN_INFO "PnPBIOS: Disabled\n"); 533 return -ENODEV; 534 } 535 536 #ifdef CONFIG_PNPACPI 537 if (!acpi_disabled && !pnpacpi_disabled) { 538 pnpbios_disabled = 1; 539 printk(KERN_INFO "PnPBIOS: Disabled by ACPI PNP\n"); 540 return -ENODEV; 541 } 542 #endif /* CONFIG_ACPI */ 543 544 /* scan the system for pnpbios support */ 545 if (!pnpbios_probe_system()) 546 return -ENODEV; 547 548 /* make preparations for bios calls */ 549 pnpbios_calls_init(pnp_bios_install); 550 551 /* read the node info */ 552 ret = pnp_bios_dev_node_info(&node_info); 553 if (ret) { 554 printk(KERN_ERR "PnPBIOS: Unable to get node info. Aborting.\n"); 555 return ret; 556 } 557 558 /* register with the pnp layer */ 559 ret = pnp_register_protocol(&pnpbios_protocol); 560 if (ret) { 561 printk(KERN_ERR "PnPBIOS: Unable to register driver. Aborting.\n"); 562 return ret; 563 } 564 565 /* start the proc interface */ 566 ret = pnpbios_proc_init(); 567 if (ret) 568 printk(KERN_ERR "PnPBIOS: Failed to create proc interface.\n"); 569 570 /* scan for pnpbios devices */ 571 build_devlist(); 572 573 return 0; 574 } 575 576 subsys_initcall(pnpbios_init); 577 578 static int __init pnpbios_thread_init(void) 579 { 580 if (pnpbios_disabled) 581 return 0; 582 #ifdef CONFIG_HOTPLUG 583 init_completion(&unload_sem); 584 if (kernel_thread(pnp_dock_thread, NULL, CLONE_KERNEL) > 0) 585 unloading = 0; 586 #endif 587 return 0; 588 } 589 590 #ifndef MODULE 591 592 /* init/main.c calls pnpbios_init early */ 593 594 /* Start the kernel thread later: */ 595 module_init(pnpbios_thread_init); 596 597 #else 598 599 /* 600 * N.B.: Building pnpbios as a module hasn't been fully implemented 601 */ 602 603 MODULE_LICENSE("GPL"); 604 605 static int __init pnpbios_init_all(void) 606 { 607 int r; 608 609 r = pnpbios_init(); 610 if (r) 611 return r; 612 r = pnpbios_thread_init(); 613 if (r) 614 return r; 615 return 0; 616 } 617 618 static void __exit pnpbios_exit(void) 619 { 620 #ifdef CONFIG_HOTPLUG 621 unloading = 1; 622 wait_for_completion(&unload_sem); 623 #endif 624 pnpbios_proc_exit(); 625 /* We ought to free resources here */ 626 return; 627 } 628 629 module_init(pnpbios_init_all); 630 module_exit(pnpbios_exit); 631 632 #endif 633 634 EXPORT_SYMBOL(pnpbios_protocol); 635