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/init.h> 50 #include <linux/linkage.h> 51 #include <linux/kernel.h> 52 #include <linux/device.h> 53 #include <linux/pnp.h> 54 #include <linux/mm.h> 55 #include <linux/smp.h> 56 #include <linux/slab.h> 57 #include <linux/completion.h> 58 #include <linux/spinlock.h> 59 #include <linux/dmi.h> 60 #include <linux/delay.h> 61 #include <linux/acpi.h> 62 #include <linux/freezer.h> 63 #include <linux/kmod.h> 64 #include <linux/kthread.h> 65 66 #include <asm/page.h> 67 #include <asm/desc.h> 68 #include <asm/byteorder.h> 69 70 #include "../base.h" 71 #include "pnpbios.h" 72 73 /* 74 * 75 * PnP BIOS INTERFACE 76 * 77 */ 78 79 static union pnp_bios_install_struct *pnp_bios_install = NULL; 80 81 int pnp_bios_present(void) 82 { 83 return (pnp_bios_install != NULL); 84 } 85 86 struct pnp_dev_node_info node_info; 87 88 /* 89 * 90 * DOCKING FUNCTIONS 91 * 92 */ 93 94 static struct completion unload_sem; 95 96 /* 97 * (Much of this belongs in a shared routine somewhere) 98 */ 99 static int pnp_dock_event(int dock, struct pnp_docking_station_info *info) 100 { 101 static char const sbin_pnpbios[] = "/sbin/pnpbios"; 102 char *argv[3], **envp, *buf, *scratch; 103 int i = 0, value; 104 105 if (!(envp = kcalloc(20, sizeof(char *), GFP_KERNEL))) 106 return -ENOMEM; 107 if (!(buf = kzalloc(256, GFP_KERNEL))) { 108 kfree(envp); 109 return -ENOMEM; 110 } 111 112 /* FIXME: if there are actual users of this, it should be 113 * integrated into the driver core and use the usual infrastructure 114 * like sysfs and uevents 115 */ 116 argv[0] = (char *)sbin_pnpbios; 117 argv[1] = "dock"; 118 argv[2] = NULL; 119 120 /* minimal command environment */ 121 envp[i++] = "HOME=/"; 122 envp[i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin"; 123 124 #ifdef DEBUG 125 /* hint that policy agent should enter no-stdout debug mode */ 126 envp[i++] = "DEBUG=kernel"; 127 #endif 128 /* extensible set of named bus-specific parameters, 129 * supporting multiple driver selection algorithms. 130 */ 131 scratch = buf; 132 133 /* action: add, remove */ 134 envp[i++] = scratch; 135 scratch += sprintf(scratch, "ACTION=%s", dock ? "add" : "remove") + 1; 136 137 /* Report the ident for the dock */ 138 envp[i++] = scratch; 139 scratch += sprintf(scratch, "DOCK=%x/%x/%x", 140 info->location_id, info->serial, info->capabilities); 141 envp[i] = NULL; 142 143 value = call_usermodehelper(sbin_pnpbios, argv, envp, UMH_WAIT_EXEC); 144 kfree(buf); 145 kfree(envp); 146 return 0; 147 } 148 149 /* 150 * Poll the PnP docking at regular intervals 151 */ 152 static int pnp_dock_thread(void *unused) 153 { 154 static struct pnp_docking_station_info now; 155 int docked = -1, d = 0; 156 157 set_freezable(); 158 while (1) { 159 int status; 160 161 /* 162 * Poll every 2 seconds 163 */ 164 msleep_interruptible(2000); 165 166 if (try_to_freeze()) 167 continue; 168 169 status = pnp_bios_dock_station_info(&now); 170 171 switch (status) { 172 /* 173 * No dock to manage 174 */ 175 case PNP_FUNCTION_NOT_SUPPORTED: 176 complete_and_exit(&unload_sem, 0); 177 case PNP_SYSTEM_NOT_DOCKED: 178 d = 0; 179 break; 180 case PNP_SUCCESS: 181 d = 1; 182 break; 183 default: 184 pnpbios_print_status("pnp_dock_thread", status); 185 printk(KERN_WARNING "PnPBIOS: disabling dock monitoring.\n"); 186 complete_and_exit(&unload_sem, 0); 187 } 188 if (d != docked) { 189 if (pnp_dock_event(d, &now) == 0) { 190 docked = d; 191 #if 0 192 printk(KERN_INFO 193 "PnPBIOS: Docking station %stached\n", 194 docked ? "at" : "de"); 195 #endif 196 } 197 } 198 } 199 complete_and_exit(&unload_sem, 0); 200 } 201 202 static int pnpbios_get_resources(struct pnp_dev *dev) 203 { 204 u8 nodenum = dev->number; 205 struct pnp_bios_node *node; 206 207 if (!pnpbios_is_dynamic(dev)) 208 return -EPERM; 209 210 pnp_dbg(&dev->dev, "get resources\n"); 211 node = kzalloc(node_info.max_node_size, GFP_KERNEL); 212 if (!node) 213 return -1; 214 if (pnp_bios_get_dev_node(&nodenum, (char)PNPMODE_DYNAMIC, node)) { 215 kfree(node); 216 return -ENODEV; 217 } 218 pnpbios_read_resources_from_node(dev, node); 219 dev->active = pnp_is_active(dev); 220 kfree(node); 221 return 0; 222 } 223 224 static int pnpbios_set_resources(struct pnp_dev *dev) 225 { 226 u8 nodenum = dev->number; 227 struct pnp_bios_node *node; 228 int ret; 229 230 if (!pnpbios_is_dynamic(dev)) 231 return -EPERM; 232 233 pnp_dbg(&dev->dev, "set resources\n"); 234 node = kzalloc(node_info.max_node_size, GFP_KERNEL); 235 if (!node) 236 return -1; 237 if (pnp_bios_get_dev_node(&nodenum, (char)PNPMODE_DYNAMIC, node)) { 238 kfree(node); 239 return -ENODEV; 240 } 241 if (pnpbios_write_resources_to_node(dev, node) < 0) { 242 kfree(node); 243 return -1; 244 } 245 ret = pnp_bios_set_dev_node(node->handle, (char)PNPMODE_DYNAMIC, node); 246 kfree(node); 247 if (ret > 0) 248 ret = -1; 249 return ret; 250 } 251 252 static void pnpbios_zero_data_stream(struct pnp_bios_node *node) 253 { 254 unsigned char *p = (char *)node->data; 255 unsigned char *end = (char *)(node->data + node->size); 256 unsigned int len; 257 int i; 258 259 while ((char *)p < (char *)end) { 260 if (p[0] & 0x80) { /* large tag */ 261 len = (p[2] << 8) | p[1]; 262 p += 3; 263 } else { 264 if (((p[0] >> 3) & 0x0f) == 0x0f) 265 return; 266 len = p[0] & 0x07; 267 p += 1; 268 } 269 for (i = 0; i < len; i++) 270 p[i] = 0; 271 p += len; 272 } 273 printk(KERN_ERR 274 "PnPBIOS: Resource structure did not contain an end tag.\n"); 275 } 276 277 static int pnpbios_disable_resources(struct pnp_dev *dev) 278 { 279 struct pnp_bios_node *node; 280 u8 nodenum = dev->number; 281 int ret; 282 283 if (dev->flags & PNPBIOS_NO_DISABLE || !pnpbios_is_dynamic(dev)) 284 return -EPERM; 285 286 node = kzalloc(node_info.max_node_size, GFP_KERNEL); 287 if (!node) 288 return -ENOMEM; 289 290 if (pnp_bios_get_dev_node(&nodenum, (char)PNPMODE_DYNAMIC, node)) { 291 kfree(node); 292 return -ENODEV; 293 } 294 pnpbios_zero_data_stream(node); 295 296 ret = pnp_bios_set_dev_node(dev->number, (char)PNPMODE_DYNAMIC, node); 297 kfree(node); 298 if (ret > 0) 299 ret = -1; 300 return ret; 301 } 302 303 /* PnP Layer support */ 304 305 struct pnp_protocol pnpbios_protocol = { 306 .name = "Plug and Play BIOS", 307 .get = pnpbios_get_resources, 308 .set = pnpbios_set_resources, 309 .disable = pnpbios_disable_resources, 310 }; 311 312 static int __init insert_device(struct pnp_bios_node *node) 313 { 314 struct list_head *pos; 315 struct pnp_dev *dev; 316 char id[8]; 317 int error; 318 319 /* check if the device is already added */ 320 list_for_each(pos, &pnpbios_protocol.devices) { 321 dev = list_entry(pos, struct pnp_dev, protocol_list); 322 if (dev->number == node->handle) 323 return -EEXIST; 324 } 325 326 pnp_eisa_id_to_string(node->eisa_id & PNP_EISA_ID_MASK, id); 327 dev = pnp_alloc_dev(&pnpbios_protocol, node->handle, id); 328 if (!dev) 329 return -ENOMEM; 330 331 pnpbios_parse_data_stream(dev, node); 332 dev->active = pnp_is_active(dev); 333 dev->flags = node->flags; 334 if (!(dev->flags & PNPBIOS_NO_CONFIG)) 335 dev->capabilities |= PNP_CONFIGURABLE; 336 if (!(dev->flags & PNPBIOS_NO_DISABLE) && pnpbios_is_dynamic(dev)) 337 dev->capabilities |= PNP_DISABLE; 338 dev->capabilities |= PNP_READ; 339 if (pnpbios_is_dynamic(dev)) 340 dev->capabilities |= PNP_WRITE; 341 if (dev->flags & PNPBIOS_REMOVABLE) 342 dev->capabilities |= PNP_REMOVABLE; 343 344 /* clear out the damaged flags */ 345 if (!dev->active) 346 pnp_init_resources(dev); 347 348 error = pnp_add_device(dev); 349 if (error) { 350 put_device(&dev->dev); 351 return error; 352 } 353 354 pnpbios_interface_attach_device(node); 355 356 return 0; 357 } 358 359 static void __init build_devlist(void) 360 { 361 u8 nodenum; 362 unsigned int nodes_got = 0; 363 unsigned int devs = 0; 364 struct pnp_bios_node *node; 365 366 node = kzalloc(node_info.max_node_size, GFP_KERNEL); 367 if (!node) 368 return; 369 370 for (nodenum = 0; nodenum < 0xff;) { 371 u8 thisnodenum = nodenum; 372 /* eventually we will want to use PNPMODE_STATIC here but for now 373 * dynamic will help us catch buggy bioses to add to the blacklist. 374 */ 375 if (!pnpbios_dont_use_current_config) { 376 if (pnp_bios_get_dev_node 377 (&nodenum, (char)PNPMODE_DYNAMIC, node)) 378 break; 379 } else { 380 if (pnp_bios_get_dev_node 381 (&nodenum, (char)PNPMODE_STATIC, node)) 382 break; 383 } 384 nodes_got++; 385 if (insert_device(node) == 0) 386 devs++; 387 if (nodenum <= thisnodenum) { 388 printk(KERN_ERR 389 "PnPBIOS: build_devlist: Node number 0x%x is out of sequence following node 0x%x. Aborting.\n", 390 (unsigned int)nodenum, 391 (unsigned int)thisnodenum); 392 break; 393 } 394 } 395 kfree(node); 396 397 printk(KERN_INFO 398 "PnPBIOS: %i node%s reported by PnP BIOS; %i recorded by driver\n", 399 nodes_got, nodes_got != 1 ? "s" : "", devs); 400 } 401 402 /* 403 * 404 * INIT AND EXIT 405 * 406 */ 407 408 static int pnpbios_disabled; 409 int pnpbios_dont_use_current_config; 410 411 static int __init pnpbios_setup(char *str) 412 { 413 int invert; 414 415 while ((str != NULL) && (*str != '\0')) { 416 if (strncmp(str, "off", 3) == 0) 417 pnpbios_disabled = 1; 418 if (strncmp(str, "on", 2) == 0) 419 pnpbios_disabled = 0; 420 invert = (strncmp(str, "no-", 3) == 0); 421 if (invert) 422 str += 3; 423 if (strncmp(str, "curr", 4) == 0) 424 pnpbios_dont_use_current_config = invert; 425 str = strchr(str, ','); 426 if (str != NULL) 427 str += strspn(str, ", \t"); 428 } 429 430 return 1; 431 } 432 433 __setup("pnpbios=", pnpbios_setup); 434 435 /* PnP BIOS signature: "$PnP" */ 436 #define PNP_SIGNATURE (('$' << 0) + ('P' << 8) + ('n' << 16) + ('P' << 24)) 437 438 static int __init pnpbios_probe_system(void) 439 { 440 union pnp_bios_install_struct *check; 441 u8 sum; 442 int length, i; 443 444 printk(KERN_INFO "PnPBIOS: Scanning system for PnP BIOS support...\n"); 445 446 /* 447 * Search the defined area (0xf0000-0xffff0) for a valid PnP BIOS 448 * structure and, if one is found, sets up the selectors and 449 * entry points 450 */ 451 for (check = (union pnp_bios_install_struct *)__va(0xf0000); 452 check < (union pnp_bios_install_struct *)__va(0xffff0); 453 check = (void *)check + 16) { 454 if (check->fields.signature != PNP_SIGNATURE) 455 continue; 456 printk(KERN_INFO 457 "PnPBIOS: Found PnP BIOS installation structure at 0x%p\n", 458 check); 459 length = check->fields.length; 460 if (!length) { 461 printk(KERN_ERR 462 "PnPBIOS: installation structure is invalid, skipping\n"); 463 continue; 464 } 465 for (sum = 0, i = 0; i < length; i++) 466 sum += check->chars[i]; 467 if (sum) { 468 printk(KERN_ERR 469 "PnPBIOS: installation structure is corrupted, skipping\n"); 470 continue; 471 } 472 if (check->fields.version < 0x10) { 473 printk(KERN_WARNING 474 "PnPBIOS: PnP BIOS version %d.%d is not supported\n", 475 check->fields.version >> 4, 476 check->fields.version & 15); 477 continue; 478 } 479 printk(KERN_INFO 480 "PnPBIOS: PnP BIOS version %d.%d, entry 0x%x:0x%x, dseg 0x%x\n", 481 check->fields.version >> 4, check->fields.version & 15, 482 check->fields.pm16cseg, check->fields.pm16offset, 483 check->fields.pm16dseg); 484 pnp_bios_install = check; 485 return 1; 486 } 487 488 printk(KERN_INFO "PnPBIOS: PnP BIOS support was not detected.\n"); 489 return 0; 490 } 491 492 static int __init exploding_pnp_bios(const struct dmi_system_id *d) 493 { 494 printk(KERN_WARNING "%s detected. Disabling PnPBIOS\n", d->ident); 495 return 0; 496 } 497 498 static const struct dmi_system_id pnpbios_dmi_table[] __initconst = { 499 { /* PnPBIOS GPF on boot */ 500 .callback = exploding_pnp_bios, 501 .ident = "Higraded P14H", 502 .matches = { 503 DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."), 504 DMI_MATCH(DMI_BIOS_VERSION, "07.00T"), 505 DMI_MATCH(DMI_SYS_VENDOR, "Higraded"), 506 DMI_MATCH(DMI_PRODUCT_NAME, "P14H"), 507 }, 508 }, 509 { /* PnPBIOS GPF on boot */ 510 .callback = exploding_pnp_bios, 511 .ident = "ASUS P4P800", 512 .matches = { 513 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer Inc."), 514 DMI_MATCH(DMI_BOARD_NAME, "P4P800"), 515 }, 516 }, 517 {} 518 }; 519 520 static int __init pnpbios_init(void) 521 { 522 int ret; 523 524 if (pnpbios_disabled || dmi_check_system(pnpbios_dmi_table) || 525 arch_pnpbios_disabled()) { 526 printk(KERN_INFO "PnPBIOS: Disabled\n"); 527 return -ENODEV; 528 } 529 530 #ifdef CONFIG_PNPACPI 531 if (!acpi_disabled && !pnpacpi_disabled) { 532 pnpbios_disabled = 1; 533 printk(KERN_INFO "PnPBIOS: Disabled by ACPI PNP\n"); 534 return -ENODEV; 535 } 536 #endif /* CONFIG_ACPI */ 537 538 /* scan the system for pnpbios support */ 539 if (!pnpbios_probe_system()) 540 return -ENODEV; 541 542 /* make preparations for bios calls */ 543 pnpbios_calls_init(pnp_bios_install); 544 545 /* read the node info */ 546 ret = pnp_bios_dev_node_info(&node_info); 547 if (ret) { 548 printk(KERN_ERR 549 "PnPBIOS: Unable to get node info. Aborting.\n"); 550 return ret; 551 } 552 553 /* register with the pnp layer */ 554 ret = pnp_register_protocol(&pnpbios_protocol); 555 if (ret) { 556 printk(KERN_ERR 557 "PnPBIOS: Unable to register driver. Aborting.\n"); 558 return ret; 559 } 560 561 /* start the proc interface */ 562 ret = pnpbios_proc_init(); 563 if (ret) 564 printk(KERN_ERR "PnPBIOS: Failed to create proc interface.\n"); 565 566 /* scan for pnpbios devices */ 567 build_devlist(); 568 569 pnp_platform_devices = 1; 570 return 0; 571 } 572 573 fs_initcall(pnpbios_init); 574 575 static int __init pnpbios_thread_init(void) 576 { 577 struct task_struct *task; 578 579 if (pnpbios_disabled) 580 return 0; 581 582 init_completion(&unload_sem); 583 task = kthread_run(pnp_dock_thread, NULL, "kpnpbiosd"); 584 return PTR_ERR_OR_ZERO(task); 585 } 586 587 /* Start the kernel thread later: */ 588 device_initcall(pnpbios_thread_init); 589 590 EXPORT_SYMBOL(pnpbios_protocol); 591