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 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 static 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 (!(envp = kcalloc(20, sizeof(char *), GFP_KERNEL))) 109 return -ENOMEM; 110 if (!(buf = kzalloc(256, GFP_KERNEL))) { 111 kfree(envp); 112 return -ENOMEM; 113 } 114 115 /* FIXME: if there are actual users of this, it should be 116 * integrated into the driver core and use the usual infrastructure 117 * like sysfs and uevents 118 */ 119 argv[0] = "/sbin/pnpbios"; 120 argv[1] = "dock"; 121 argv[2] = NULL; 122 123 /* minimal command environment */ 124 envp[i++] = "HOME=/"; 125 envp[i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin"; 126 127 #ifdef DEBUG 128 /* hint that policy agent should enter no-stdout debug mode */ 129 envp[i++] = "DEBUG=kernel"; 130 #endif 131 /* extensible set of named bus-specific parameters, 132 * supporting multiple driver selection algorithms. 133 */ 134 scratch = buf; 135 136 /* action: add, remove */ 137 envp[i++] = scratch; 138 scratch += sprintf(scratch, "ACTION=%s", dock ? "add" : "remove") + 1; 139 140 /* Report the ident for the dock */ 141 envp[i++] = scratch; 142 scratch += sprintf(scratch, "DOCK=%x/%x/%x", 143 info->location_id, info->serial, info->capabilities); 144 envp[i] = NULL; 145 146 value = call_usermodehelper(argv [0], argv, envp, UMH_WAIT_EXEC); 147 kfree(buf); 148 kfree(envp); 149 return 0; 150 } 151 152 /* 153 * Poll the PnP docking at regular intervals 154 */ 155 static int pnp_dock_thread(void *unused) 156 { 157 static struct pnp_docking_station_info now; 158 int docked = -1, d = 0; 159 160 set_freezable(); 161 while (!unloading) { 162 int status; 163 164 /* 165 * Poll every 2 seconds 166 */ 167 msleep_interruptible(2000); 168 169 if (try_to_freeze()) 170 continue; 171 172 status = pnp_bios_dock_station_info(&now); 173 174 switch (status) { 175 /* 176 * No dock to manage 177 */ 178 case PNP_FUNCTION_NOT_SUPPORTED: 179 complete_and_exit(&unload_sem, 0); 180 case PNP_SYSTEM_NOT_DOCKED: 181 d = 0; 182 break; 183 case PNP_SUCCESS: 184 d = 1; 185 break; 186 default: 187 pnpbios_print_status("pnp_dock_thread", status); 188 continue; 189 } 190 if (d != docked) { 191 if (pnp_dock_event(d, &now) == 0) { 192 docked = d; 193 #if 0 194 printk(KERN_INFO 195 "PnPBIOS: Docking station %stached\n", 196 docked ? "at" : "de"); 197 #endif 198 } 199 } 200 } 201 complete_and_exit(&unload_sem, 0); 202 } 203 204 #endif /* CONFIG_HOTPLUG */ 205 206 static int pnpbios_get_resources(struct pnp_dev *dev) 207 { 208 u8 nodenum = dev->number; 209 struct pnp_bios_node *node; 210 211 if (!pnpbios_is_dynamic(dev)) 212 return -EPERM; 213 214 dev_dbg(&dev->dev, "get resources\n"); 215 node = kzalloc(node_info.max_node_size, GFP_KERNEL); 216 if (!node) 217 return -1; 218 if (pnp_bios_get_dev_node(&nodenum, (char)PNPMODE_DYNAMIC, node)) { 219 kfree(node); 220 return -ENODEV; 221 } 222 pnpbios_read_resources_from_node(dev, node); 223 dev->active = pnp_is_active(dev); 224 kfree(node); 225 return 0; 226 } 227 228 static int pnpbios_set_resources(struct pnp_dev *dev) 229 { 230 u8 nodenum = dev->number; 231 struct pnp_bios_node *node; 232 int ret; 233 234 if (!pnpbios_is_dynamic(dev)) 235 return -EPERM; 236 237 dev_dbg(&dev->dev, "set resources\n"); 238 node = kzalloc(node_info.max_node_size, GFP_KERNEL); 239 if (!node) 240 return -1; 241 if (pnp_bios_get_dev_node(&nodenum, (char)PNPMODE_DYNAMIC, node)) { 242 kfree(node); 243 return -ENODEV; 244 } 245 if (pnpbios_write_resources_to_node(dev, node) < 0) { 246 kfree(node); 247 return -1; 248 } 249 ret = pnp_bios_set_dev_node(node->handle, (char)PNPMODE_DYNAMIC, node); 250 kfree(node); 251 if (ret > 0) 252 ret = -1; 253 return ret; 254 } 255 256 static void pnpbios_zero_data_stream(struct pnp_bios_node *node) 257 { 258 unsigned char *p = (char *)node->data; 259 unsigned char *end = (char *)(node->data + node->size); 260 unsigned int len; 261 int i; 262 263 while ((char *)p < (char *)end) { 264 if (p[0] & 0x80) { /* large tag */ 265 len = (p[2] << 8) | p[1]; 266 p += 3; 267 } else { 268 if (((p[0] >> 3) & 0x0f) == 0x0f) 269 return; 270 len = p[0] & 0x07; 271 p += 1; 272 } 273 for (i = 0; i < len; i++) 274 p[i] = 0; 275 p += len; 276 } 277 printk(KERN_ERR 278 "PnPBIOS: Resource structure did not contain an end tag.\n"); 279 } 280 281 static int pnpbios_disable_resources(struct pnp_dev *dev) 282 { 283 struct pnp_bios_node *node; 284 u8 nodenum = dev->number; 285 int ret; 286 287 if (dev->flags & PNPBIOS_NO_DISABLE || !pnpbios_is_dynamic(dev)) 288 return -EPERM; 289 290 node = kzalloc(node_info.max_node_size, GFP_KERNEL); 291 if (!node) 292 return -ENOMEM; 293 294 if (pnp_bios_get_dev_node(&nodenum, (char)PNPMODE_DYNAMIC, node)) { 295 kfree(node); 296 return -ENODEV; 297 } 298 pnpbios_zero_data_stream(node); 299 300 ret = pnp_bios_set_dev_node(dev->number, (char)PNPMODE_DYNAMIC, node); 301 kfree(node); 302 if (ret > 0) 303 ret = -1; 304 return ret; 305 } 306 307 /* PnP Layer support */ 308 309 struct pnp_protocol pnpbios_protocol = { 310 .name = "Plug and Play BIOS", 311 .get = pnpbios_get_resources, 312 .set = pnpbios_set_resources, 313 .disable = pnpbios_disable_resources, 314 }; 315 316 static int __init insert_device(struct pnp_bios_node *node) 317 { 318 struct list_head *pos; 319 struct pnp_dev *dev; 320 char id[8]; 321 322 /* check if the device is already added */ 323 list_for_each(pos, &pnpbios_protocol.devices) { 324 dev = list_entry(pos, struct pnp_dev, protocol_list); 325 if (dev->number == node->handle) 326 return -1; 327 } 328 329 pnp_eisa_id_to_string(node->eisa_id & PNP_EISA_ID_MASK, id); 330 dev = pnp_alloc_dev(&pnpbios_protocol, node->handle, id); 331 if (!dev) 332 return -1; 333 334 pnpbios_parse_data_stream(dev, node); 335 dev->active = pnp_is_active(dev); 336 dev->flags = node->flags; 337 if (!(dev->flags & PNPBIOS_NO_CONFIG)) 338 dev->capabilities |= PNP_CONFIGURABLE; 339 if (!(dev->flags & PNPBIOS_NO_DISABLE) && pnpbios_is_dynamic(dev)) 340 dev->capabilities |= PNP_DISABLE; 341 dev->capabilities |= PNP_READ; 342 if (pnpbios_is_dynamic(dev)) 343 dev->capabilities |= PNP_WRITE; 344 if (dev->flags & PNPBIOS_REMOVABLE) 345 dev->capabilities |= PNP_REMOVABLE; 346 347 /* clear out the damaged flags */ 348 if (!dev->active) 349 pnp_init_resources(dev); 350 351 pnp_add_device(dev); 352 pnpbios_interface_attach_device(node); 353 354 return 0; 355 } 356 357 static void __init build_devlist(void) 358 { 359 u8 nodenum; 360 unsigned int nodes_got = 0; 361 unsigned int devs = 0; 362 struct pnp_bios_node *node; 363 364 node = kzalloc(node_info.max_node_size, GFP_KERNEL); 365 if (!node) 366 return; 367 368 for (nodenum = 0; nodenum < 0xff;) { 369 u8 thisnodenum = nodenum; 370 /* eventually we will want to use PNPMODE_STATIC here but for now 371 * dynamic will help us catch buggy bioses to add to the blacklist. 372 */ 373 if (!pnpbios_dont_use_current_config) { 374 if (pnp_bios_get_dev_node 375 (&nodenum, (char)PNPMODE_DYNAMIC, node)) 376 break; 377 } else { 378 if (pnp_bios_get_dev_node 379 (&nodenum, (char)PNPMODE_STATIC, node)) 380 break; 381 } 382 nodes_got++; 383 if (insert_device(node) == 0) 384 devs++; 385 if (nodenum <= thisnodenum) { 386 printk(KERN_ERR 387 "PnPBIOS: build_devlist: Node number 0x%x is out of sequence following node 0x%x. Aborting.\n", 388 (unsigned int)nodenum, 389 (unsigned int)thisnodenum); 390 break; 391 } 392 } 393 kfree(node); 394 395 printk(KERN_INFO 396 "PnPBIOS: %i node%s reported by PnP BIOS; %i recorded by driver\n", 397 nodes_got, nodes_got != 1 ? "s" : "", devs); 398 } 399 400 /* 401 * 402 * INIT AND EXIT 403 * 404 */ 405 406 static int pnpbios_disabled; 407 int pnpbios_dont_use_current_config; 408 409 static int __init pnpbios_setup(char *str) 410 { 411 int invert; 412 413 while ((str != NULL) && (*str != '\0')) { 414 if (strncmp(str, "off", 3) == 0) 415 pnpbios_disabled = 1; 416 if (strncmp(str, "on", 2) == 0) 417 pnpbios_disabled = 0; 418 invert = (strncmp(str, "no-", 3) == 0); 419 if (invert) 420 str += 3; 421 if (strncmp(str, "curr", 4) == 0) 422 pnpbios_dont_use_current_config = invert; 423 str = strchr(str, ','); 424 if (str != NULL) 425 str += strspn(str, ", \t"); 426 } 427 428 return 1; 429 } 430 431 __setup("pnpbios=", pnpbios_setup); 432 433 /* PnP BIOS signature: "$PnP" */ 434 #define PNP_SIGNATURE (('$' << 0) + ('P' << 8) + ('n' << 16) + ('P' << 24)) 435 436 static int __init pnpbios_probe_system(void) 437 { 438 union pnp_bios_install_struct *check; 439 u8 sum; 440 int length, i; 441 442 printk(KERN_INFO "PnPBIOS: Scanning system for PnP BIOS support...\n"); 443 444 /* 445 * Search the defined area (0xf0000-0xffff0) for a valid PnP BIOS 446 * structure and, if one is found, sets up the selectors and 447 * entry points 448 */ 449 for (check = (union pnp_bios_install_struct *)__va(0xf0000); 450 check < (union pnp_bios_install_struct *)__va(0xffff0); 451 check = (void *)check + 16) { 452 if (check->fields.signature != PNP_SIGNATURE) 453 continue; 454 printk(KERN_INFO 455 "PnPBIOS: Found PnP BIOS installation structure at 0x%p\n", 456 check); 457 length = check->fields.length; 458 if (!length) { 459 printk(KERN_ERR 460 "PnPBIOS: installation structure is invalid, skipping\n"); 461 continue; 462 } 463 for (sum = 0, i = 0; i < length; i++) 464 sum += check->chars[i]; 465 if (sum) { 466 printk(KERN_ERR 467 "PnPBIOS: installation structure is corrupted, skipping\n"); 468 continue; 469 } 470 if (check->fields.version < 0x10) { 471 printk(KERN_WARNING 472 "PnPBIOS: PnP BIOS version %d.%d is not supported\n", 473 check->fields.version >> 4, 474 check->fields.version & 15); 475 continue; 476 } 477 printk(KERN_INFO 478 "PnPBIOS: PnP BIOS version %d.%d, entry 0x%x:0x%x, dseg 0x%x\n", 479 check->fields.version >> 4, check->fields.version & 15, 480 check->fields.pm16cseg, check->fields.pm16offset, 481 check->fields.pm16dseg); 482 pnp_bios_install = check; 483 return 1; 484 } 485 486 printk(KERN_INFO "PnPBIOS: PnP BIOS support was not detected.\n"); 487 return 0; 488 } 489 490 static int __init exploding_pnp_bios(const struct dmi_system_id *d) 491 { 492 printk(KERN_WARNING "%s detected. Disabling PnPBIOS\n", d->ident); 493 return 0; 494 } 495 496 static struct dmi_system_id pnpbios_dmi_table[] __initdata = { 497 { /* PnPBIOS GPF on boot */ 498 .callback = exploding_pnp_bios, 499 .ident = "Higraded P14H", 500 .matches = { 501 DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."), 502 DMI_MATCH(DMI_BIOS_VERSION, "07.00T"), 503 DMI_MATCH(DMI_SYS_VENDOR, "Higraded"), 504 DMI_MATCH(DMI_PRODUCT_NAME, "P14H"), 505 }, 506 }, 507 { /* PnPBIOS GPF on boot */ 508 .callback = exploding_pnp_bios, 509 .ident = "ASUS P4P800", 510 .matches = { 511 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer Inc."), 512 DMI_MATCH(DMI_BOARD_NAME, "P4P800"), 513 }, 514 }, 515 {} 516 }; 517 518 static int __init pnpbios_init(void) 519 { 520 int ret; 521 522 #if defined(CONFIG_PPC_MERGE) 523 if (check_legacy_ioport(PNPBIOS_BASE)) 524 return -ENODEV; 525 #endif 526 if (pnpbios_disabled || dmi_check_system(pnpbios_dmi_table) || 527 paravirt_enabled()) { 528 printk(KERN_INFO "PnPBIOS: Disabled\n"); 529 return -ENODEV; 530 } 531 #ifdef CONFIG_PNPACPI 532 if (!acpi_disabled && !pnpacpi_disabled) { 533 pnpbios_disabled = 1; 534 printk(KERN_INFO "PnPBIOS: Disabled by ACPI PNP\n"); 535 return -ENODEV; 536 } 537 #endif /* CONFIG_ACPI */ 538 539 /* scan the system for pnpbios support */ 540 if (!pnpbios_probe_system()) 541 return -ENODEV; 542 543 /* make preparations for bios calls */ 544 pnpbios_calls_init(pnp_bios_install); 545 546 /* read the node info */ 547 ret = pnp_bios_dev_node_info(&node_info); 548 if (ret) { 549 printk(KERN_ERR 550 "PnPBIOS: Unable to get node info. Aborting.\n"); 551 return ret; 552 } 553 554 /* register with the pnp layer */ 555 ret = pnp_register_protocol(&pnpbios_protocol); 556 if (ret) { 557 printk(KERN_ERR 558 "PnPBIOS: Unable to register driver. Aborting.\n"); 559 return ret; 560 } 561 562 /* start the proc interface */ 563 ret = pnpbios_proc_init(); 564 if (ret) 565 printk(KERN_ERR "PnPBIOS: Failed to create proc interface.\n"); 566 567 /* scan for pnpbios devices */ 568 build_devlist(); 569 570 pnp_platform_devices = 1; 571 return 0; 572 } 573 574 subsys_initcall(pnpbios_init); 575 576 static int __init pnpbios_thread_init(void) 577 { 578 struct task_struct *task; 579 580 #if defined(CONFIG_PPC_MERGE) 581 if (check_legacy_ioport(PNPBIOS_BASE)) 582 return 0; 583 #endif 584 if (pnpbios_disabled) 585 return 0; 586 #ifdef CONFIG_HOTPLUG 587 init_completion(&unload_sem); 588 task = kthread_run(pnp_dock_thread, NULL, "kpnpbiosd"); 589 if (!IS_ERR(task)) 590 unloading = 0; 591 #endif 592 return 0; 593 } 594 595 /* Start the kernel thread later: */ 596 module_init(pnpbios_thread_init); 597 598 EXPORT_SYMBOL(pnpbios_protocol); 599