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/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 char *argv[3], **envp, *buf, *scratch; 102 int i = 0, value; 103 104 if (!(envp = kcalloc(20, sizeof(char *), GFP_KERNEL))) 105 return -ENOMEM; 106 if (!(buf = kzalloc(256, GFP_KERNEL))) { 107 kfree(envp); 108 return -ENOMEM; 109 } 110 111 /* FIXME: if there are actual users of this, it should be 112 * integrated into the driver core and use the usual infrastructure 113 * like sysfs and uevents 114 */ 115 argv[0] = "/sbin/pnpbios"; 116 argv[1] = "dock"; 117 argv[2] = NULL; 118 119 /* minimal command environment */ 120 envp[i++] = "HOME=/"; 121 envp[i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin"; 122 123 #ifdef DEBUG 124 /* hint that policy agent should enter no-stdout debug mode */ 125 envp[i++] = "DEBUG=kernel"; 126 #endif 127 /* extensible set of named bus-specific parameters, 128 * supporting multiple driver selection algorithms. 129 */ 130 scratch = buf; 131 132 /* action: add, remove */ 133 envp[i++] = scratch; 134 scratch += sprintf(scratch, "ACTION=%s", dock ? "add" : "remove") + 1; 135 136 /* Report the ident for the dock */ 137 envp[i++] = scratch; 138 scratch += sprintf(scratch, "DOCK=%x/%x/%x", 139 info->location_id, info->serial, info->capabilities); 140 envp[i] = NULL; 141 142 value = call_usermodehelper(argv [0], argv, envp, UMH_WAIT_EXEC); 143 kfree(buf); 144 kfree(envp); 145 return 0; 146 } 147 148 /* 149 * Poll the PnP docking at regular intervals 150 */ 151 static int pnp_dock_thread(void *unused) 152 { 153 static struct pnp_docking_station_info now; 154 int docked = -1, d = 0; 155 156 set_freezable(); 157 while (1) { 158 int status; 159 160 /* 161 * Poll every 2 seconds 162 */ 163 msleep_interruptible(2000); 164 165 if (try_to_freeze()) 166 continue; 167 168 status = pnp_bios_dock_station_info(&now); 169 170 switch (status) { 171 /* 172 * No dock to manage 173 */ 174 case PNP_FUNCTION_NOT_SUPPORTED: 175 complete_and_exit(&unload_sem, 0); 176 case PNP_SYSTEM_NOT_DOCKED: 177 d = 0; 178 break; 179 case PNP_SUCCESS: 180 d = 1; 181 break; 182 default: 183 pnpbios_print_status("pnp_dock_thread", status); 184 printk(KERN_WARNING "PnPBIOS: disabling dock monitoring.\n"); 185 complete_and_exit(&unload_sem, 0); 186 } 187 if (d != docked) { 188 if (pnp_dock_event(d, &now) == 0) { 189 docked = d; 190 #if 0 191 printk(KERN_INFO 192 "PnPBIOS: Docking station %stached\n", 193 docked ? "at" : "de"); 194 #endif 195 } 196 } 197 } 198 complete_and_exit(&unload_sem, 0); 199 } 200 201 static int pnpbios_get_resources(struct pnp_dev *dev) 202 { 203 u8 nodenum = dev->number; 204 struct pnp_bios_node *node; 205 206 if (!pnpbios_is_dynamic(dev)) 207 return -EPERM; 208 209 pnp_dbg(&dev->dev, "get resources\n"); 210 node = kzalloc(node_info.max_node_size, GFP_KERNEL); 211 if (!node) 212 return -1; 213 if (pnp_bios_get_dev_node(&nodenum, (char)PNPMODE_DYNAMIC, node)) { 214 kfree(node); 215 return -ENODEV; 216 } 217 pnpbios_read_resources_from_node(dev, node); 218 dev->active = pnp_is_active(dev); 219 kfree(node); 220 return 0; 221 } 222 223 static int pnpbios_set_resources(struct pnp_dev *dev) 224 { 225 u8 nodenum = dev->number; 226 struct pnp_bios_node *node; 227 int ret; 228 229 if (!pnpbios_is_dynamic(dev)) 230 return -EPERM; 231 232 pnp_dbg(&dev->dev, "set resources\n"); 233 node = kzalloc(node_info.max_node_size, GFP_KERNEL); 234 if (!node) 235 return -1; 236 if (pnp_bios_get_dev_node(&nodenum, (char)PNPMODE_DYNAMIC, node)) { 237 kfree(node); 238 return -ENODEV; 239 } 240 if (pnpbios_write_resources_to_node(dev, node) < 0) { 241 kfree(node); 242 return -1; 243 } 244 ret = pnp_bios_set_dev_node(node->handle, (char)PNPMODE_DYNAMIC, node); 245 kfree(node); 246 if (ret > 0) 247 ret = -1; 248 return ret; 249 } 250 251 static void pnpbios_zero_data_stream(struct pnp_bios_node *node) 252 { 253 unsigned char *p = (char *)node->data; 254 unsigned char *end = (char *)(node->data + node->size); 255 unsigned int len; 256 int i; 257 258 while ((char *)p < (char *)end) { 259 if (p[0] & 0x80) { /* large tag */ 260 len = (p[2] << 8) | p[1]; 261 p += 3; 262 } else { 263 if (((p[0] >> 3) & 0x0f) == 0x0f) 264 return; 265 len = p[0] & 0x07; 266 p += 1; 267 } 268 for (i = 0; i < len; i++) 269 p[i] = 0; 270 p += len; 271 } 272 printk(KERN_ERR 273 "PnPBIOS: Resource structure did not contain an end tag.\n"); 274 } 275 276 static int pnpbios_disable_resources(struct pnp_dev *dev) 277 { 278 struct pnp_bios_node *node; 279 u8 nodenum = dev->number; 280 int ret; 281 282 if (dev->flags & PNPBIOS_NO_DISABLE || !pnpbios_is_dynamic(dev)) 283 return -EPERM; 284 285 node = kzalloc(node_info.max_node_size, GFP_KERNEL); 286 if (!node) 287 return -ENOMEM; 288 289 if (pnp_bios_get_dev_node(&nodenum, (char)PNPMODE_DYNAMIC, node)) { 290 kfree(node); 291 return -ENODEV; 292 } 293 pnpbios_zero_data_stream(node); 294 295 ret = pnp_bios_set_dev_node(dev->number, (char)PNPMODE_DYNAMIC, node); 296 kfree(node); 297 if (ret > 0) 298 ret = -1; 299 return ret; 300 } 301 302 /* PnP Layer support */ 303 304 struct pnp_protocol pnpbios_protocol = { 305 .name = "Plug and Play BIOS", 306 .get = pnpbios_get_resources, 307 .set = pnpbios_set_resources, 308 .disable = pnpbios_disable_resources, 309 }; 310 311 static int __init insert_device(struct pnp_bios_node *node) 312 { 313 struct list_head *pos; 314 struct pnp_dev *dev; 315 char id[8]; 316 int error; 317 318 /* check if the device is already added */ 319 list_for_each(pos, &pnpbios_protocol.devices) { 320 dev = list_entry(pos, struct pnp_dev, protocol_list); 321 if (dev->number == node->handle) 322 return -EEXIST; 323 } 324 325 pnp_eisa_id_to_string(node->eisa_id & PNP_EISA_ID_MASK, id); 326 dev = pnp_alloc_dev(&pnpbios_protocol, node->handle, id); 327 if (!dev) 328 return -ENOMEM; 329 330 pnpbios_parse_data_stream(dev, node); 331 dev->active = pnp_is_active(dev); 332 dev->flags = node->flags; 333 if (!(dev->flags & PNPBIOS_NO_CONFIG)) 334 dev->capabilities |= PNP_CONFIGURABLE; 335 if (!(dev->flags & PNPBIOS_NO_DISABLE) && pnpbios_is_dynamic(dev)) 336 dev->capabilities |= PNP_DISABLE; 337 dev->capabilities |= PNP_READ; 338 if (pnpbios_is_dynamic(dev)) 339 dev->capabilities |= PNP_WRITE; 340 if (dev->flags & PNPBIOS_REMOVABLE) 341 dev->capabilities |= PNP_REMOVABLE; 342 343 /* clear out the damaged flags */ 344 if (!dev->active) 345 pnp_init_resources(dev); 346 347 error = pnp_add_device(dev); 348 if (error) { 349 put_device(&dev->dev); 350 return error; 351 } 352 353 pnpbios_interface_attach_device(node); 354 355 return 0; 356 } 357 358 static void __init build_devlist(void) 359 { 360 u8 nodenum; 361 unsigned int nodes_got = 0; 362 unsigned int devs = 0; 363 struct pnp_bios_node *node; 364 365 node = kzalloc(node_info.max_node_size, GFP_KERNEL); 366 if (!node) 367 return; 368 369 for (nodenum = 0; nodenum < 0xff;) { 370 u8 thisnodenum = nodenum; 371 /* eventually we will want to use PNPMODE_STATIC here but for now 372 * dynamic will help us catch buggy bioses to add to the blacklist. 373 */ 374 if (!pnpbios_dont_use_current_config) { 375 if (pnp_bios_get_dev_node 376 (&nodenum, (char)PNPMODE_DYNAMIC, node)) 377 break; 378 } else { 379 if (pnp_bios_get_dev_node 380 (&nodenum, (char)PNPMODE_STATIC, node)) 381 break; 382 } 383 nodes_got++; 384 if (insert_device(node) == 0) 385 devs++; 386 if (nodenum <= thisnodenum) { 387 printk(KERN_ERR 388 "PnPBIOS: build_devlist: Node number 0x%x is out of sequence following node 0x%x. Aborting.\n", 389 (unsigned int)nodenum, 390 (unsigned int)thisnodenum); 391 break; 392 } 393 } 394 kfree(node); 395 396 printk(KERN_INFO 397 "PnPBIOS: %i node%s reported by PnP BIOS; %i recorded by driver\n", 398 nodes_got, nodes_got != 1 ? "s" : "", devs); 399 } 400 401 /* 402 * 403 * INIT AND EXIT 404 * 405 */ 406 407 static int pnpbios_disabled; 408 int pnpbios_dont_use_current_config; 409 410 static int __init pnpbios_setup(char *str) 411 { 412 int invert; 413 414 while ((str != NULL) && (*str != '\0')) { 415 if (strncmp(str, "off", 3) == 0) 416 pnpbios_disabled = 1; 417 if (strncmp(str, "on", 2) == 0) 418 pnpbios_disabled = 0; 419 invert = (strncmp(str, "no-", 3) == 0); 420 if (invert) 421 str += 3; 422 if (strncmp(str, "curr", 4) == 0) 423 pnpbios_dont_use_current_config = invert; 424 str = strchr(str, ','); 425 if (str != NULL) 426 str += strspn(str, ", \t"); 427 } 428 429 return 1; 430 } 431 432 __setup("pnpbios=", pnpbios_setup); 433 434 /* PnP BIOS signature: "$PnP" */ 435 #define PNP_SIGNATURE (('$' << 0) + ('P' << 8) + ('n' << 16) + ('P' << 24)) 436 437 static int __init pnpbios_probe_system(void) 438 { 439 union pnp_bios_install_struct *check; 440 u8 sum; 441 int length, i; 442 443 printk(KERN_INFO "PnPBIOS: Scanning system for PnP BIOS support...\n"); 444 445 /* 446 * Search the defined area (0xf0000-0xffff0) for a valid PnP BIOS 447 * structure and, if one is found, sets up the selectors and 448 * entry points 449 */ 450 for (check = (union pnp_bios_install_struct *)__va(0xf0000); 451 check < (union pnp_bios_install_struct *)__va(0xffff0); 452 check = (void *)check + 16) { 453 if (check->fields.signature != PNP_SIGNATURE) 454 continue; 455 printk(KERN_INFO 456 "PnPBIOS: Found PnP BIOS installation structure at 0x%p\n", 457 check); 458 length = check->fields.length; 459 if (!length) { 460 printk(KERN_ERR 461 "PnPBIOS: installation structure is invalid, skipping\n"); 462 continue; 463 } 464 for (sum = 0, i = 0; i < length; i++) 465 sum += check->chars[i]; 466 if (sum) { 467 printk(KERN_ERR 468 "PnPBIOS: installation structure is corrupted, skipping\n"); 469 continue; 470 } 471 if (check->fields.version < 0x10) { 472 printk(KERN_WARNING 473 "PnPBIOS: PnP BIOS version %d.%d is not supported\n", 474 check->fields.version >> 4, 475 check->fields.version & 15); 476 continue; 477 } 478 printk(KERN_INFO 479 "PnPBIOS: PnP BIOS version %d.%d, entry 0x%x:0x%x, dseg 0x%x\n", 480 check->fields.version >> 4, check->fields.version & 15, 481 check->fields.pm16cseg, check->fields.pm16offset, 482 check->fields.pm16dseg); 483 pnp_bios_install = check; 484 return 1; 485 } 486 487 printk(KERN_INFO "PnPBIOS: PnP BIOS support was not detected.\n"); 488 return 0; 489 } 490 491 static int __init exploding_pnp_bios(const struct dmi_system_id *d) 492 { 493 printk(KERN_WARNING "%s detected. Disabling PnPBIOS\n", d->ident); 494 return 0; 495 } 496 497 static struct dmi_system_id pnpbios_dmi_table[] __initdata = { 498 { /* PnPBIOS GPF on boot */ 499 .callback = exploding_pnp_bios, 500 .ident = "Higraded P14H", 501 .matches = { 502 DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."), 503 DMI_MATCH(DMI_BIOS_VERSION, "07.00T"), 504 DMI_MATCH(DMI_SYS_VENDOR, "Higraded"), 505 DMI_MATCH(DMI_PRODUCT_NAME, "P14H"), 506 }, 507 }, 508 { /* PnPBIOS GPF on boot */ 509 .callback = exploding_pnp_bios, 510 .ident = "ASUS P4P800", 511 .matches = { 512 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer Inc."), 513 DMI_MATCH(DMI_BOARD_NAME, "P4P800"), 514 }, 515 }, 516 {} 517 }; 518 519 static int __init pnpbios_init(void) 520 { 521 int ret; 522 523 if (pnpbios_disabled || dmi_check_system(pnpbios_dmi_table) || 524 arch_pnpbios_disabled()) { 525 printk(KERN_INFO "PnPBIOS: Disabled\n"); 526 return -ENODEV; 527 } 528 529 #ifdef CONFIG_PNPACPI 530 if (!acpi_disabled && !pnpacpi_disabled) { 531 pnpbios_disabled = 1; 532 printk(KERN_INFO "PnPBIOS: Disabled by ACPI PNP\n"); 533 return -ENODEV; 534 } 535 #endif /* CONFIG_ACPI */ 536 537 /* scan the system for pnpbios support */ 538 if (!pnpbios_probe_system()) 539 return -ENODEV; 540 541 /* make preparations for bios calls */ 542 pnpbios_calls_init(pnp_bios_install); 543 544 /* read the node info */ 545 ret = pnp_bios_dev_node_info(&node_info); 546 if (ret) { 547 printk(KERN_ERR 548 "PnPBIOS: Unable to get node info. Aborting.\n"); 549 return ret; 550 } 551 552 /* register with the pnp layer */ 553 ret = pnp_register_protocol(&pnpbios_protocol); 554 if (ret) { 555 printk(KERN_ERR 556 "PnPBIOS: Unable to register driver. Aborting.\n"); 557 return ret; 558 } 559 560 /* start the proc interface */ 561 ret = pnpbios_proc_init(); 562 if (ret) 563 printk(KERN_ERR "PnPBIOS: Failed to create proc interface.\n"); 564 565 /* scan for pnpbios devices */ 566 build_devlist(); 567 568 pnp_platform_devices = 1; 569 return 0; 570 } 571 572 fs_initcall(pnpbios_init); 573 574 static int __init pnpbios_thread_init(void) 575 { 576 struct task_struct *task; 577 578 if (pnpbios_disabled) 579 return 0; 580 581 init_completion(&unload_sem); 582 task = kthread_run(pnp_dock_thread, NULL, "kpnpbiosd"); 583 if (IS_ERR(task)) 584 return PTR_ERR(task); 585 586 return 0; 587 } 588 589 /* Start the kernel thread later: */ 590 module_init(pnpbios_thread_init); 591 592 EXPORT_SYMBOL(pnpbios_protocol); 593