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 continue; 185 } 186 if (d != docked) { 187 if (pnp_dock_event(d, &now) == 0) { 188 docked = d; 189 #if 0 190 printk(KERN_INFO 191 "PnPBIOS: Docking station %stached\n", 192 docked ? "at" : "de"); 193 #endif 194 } 195 } 196 } 197 complete_and_exit(&unload_sem, 0); 198 } 199 200 static int pnpbios_get_resources(struct pnp_dev *dev) 201 { 202 u8 nodenum = dev->number; 203 struct pnp_bios_node *node; 204 205 if (!pnpbios_is_dynamic(dev)) 206 return -EPERM; 207 208 pnp_dbg(&dev->dev, "get resources\n"); 209 node = kzalloc(node_info.max_node_size, GFP_KERNEL); 210 if (!node) 211 return -1; 212 if (pnp_bios_get_dev_node(&nodenum, (char)PNPMODE_DYNAMIC, node)) { 213 kfree(node); 214 return -ENODEV; 215 } 216 pnpbios_read_resources_from_node(dev, node); 217 dev->active = pnp_is_active(dev); 218 kfree(node); 219 return 0; 220 } 221 222 static int pnpbios_set_resources(struct pnp_dev *dev) 223 { 224 u8 nodenum = dev->number; 225 struct pnp_bios_node *node; 226 int ret; 227 228 if (!pnpbios_is_dynamic(dev)) 229 return -EPERM; 230 231 pnp_dbg(&dev->dev, "set resources\n"); 232 node = kzalloc(node_info.max_node_size, GFP_KERNEL); 233 if (!node) 234 return -1; 235 if (pnp_bios_get_dev_node(&nodenum, (char)PNPMODE_DYNAMIC, node)) { 236 kfree(node); 237 return -ENODEV; 238 } 239 if (pnpbios_write_resources_to_node(dev, node) < 0) { 240 kfree(node); 241 return -1; 242 } 243 ret = pnp_bios_set_dev_node(node->handle, (char)PNPMODE_DYNAMIC, node); 244 kfree(node); 245 if (ret > 0) 246 ret = -1; 247 return ret; 248 } 249 250 static void pnpbios_zero_data_stream(struct pnp_bios_node *node) 251 { 252 unsigned char *p = (char *)node->data; 253 unsigned char *end = (char *)(node->data + node->size); 254 unsigned int len; 255 int i; 256 257 while ((char *)p < (char *)end) { 258 if (p[0] & 0x80) { /* large tag */ 259 len = (p[2] << 8) | p[1]; 260 p += 3; 261 } else { 262 if (((p[0] >> 3) & 0x0f) == 0x0f) 263 return; 264 len = p[0] & 0x07; 265 p += 1; 266 } 267 for (i = 0; i < len; i++) 268 p[i] = 0; 269 p += len; 270 } 271 printk(KERN_ERR 272 "PnPBIOS: Resource structure did not contain an end tag.\n"); 273 } 274 275 static int pnpbios_disable_resources(struct pnp_dev *dev) 276 { 277 struct pnp_bios_node *node; 278 u8 nodenum = dev->number; 279 int ret; 280 281 if (dev->flags & PNPBIOS_NO_DISABLE || !pnpbios_is_dynamic(dev)) 282 return -EPERM; 283 284 node = kzalloc(node_info.max_node_size, GFP_KERNEL); 285 if (!node) 286 return -ENOMEM; 287 288 if (pnp_bios_get_dev_node(&nodenum, (char)PNPMODE_DYNAMIC, node)) { 289 kfree(node); 290 return -ENODEV; 291 } 292 pnpbios_zero_data_stream(node); 293 294 ret = pnp_bios_set_dev_node(dev->number, (char)PNPMODE_DYNAMIC, node); 295 kfree(node); 296 if (ret > 0) 297 ret = -1; 298 return ret; 299 } 300 301 /* PnP Layer support */ 302 303 struct pnp_protocol pnpbios_protocol = { 304 .name = "Plug and Play BIOS", 305 .get = pnpbios_get_resources, 306 .set = pnpbios_set_resources, 307 .disable = pnpbios_disable_resources, 308 }; 309 310 static int __init insert_device(struct pnp_bios_node *node) 311 { 312 struct list_head *pos; 313 struct pnp_dev *dev; 314 char id[8]; 315 int error; 316 317 /* check if the device is already added */ 318 list_for_each(pos, &pnpbios_protocol.devices) { 319 dev = list_entry(pos, struct pnp_dev, protocol_list); 320 if (dev->number == node->handle) 321 return -EEXIST; 322 } 323 324 pnp_eisa_id_to_string(node->eisa_id & PNP_EISA_ID_MASK, id); 325 dev = pnp_alloc_dev(&pnpbios_protocol, node->handle, id); 326 if (!dev) 327 return -ENOMEM; 328 329 pnpbios_parse_data_stream(dev, node); 330 dev->active = pnp_is_active(dev); 331 dev->flags = node->flags; 332 if (!(dev->flags & PNPBIOS_NO_CONFIG)) 333 dev->capabilities |= PNP_CONFIGURABLE; 334 if (!(dev->flags & PNPBIOS_NO_DISABLE) && pnpbios_is_dynamic(dev)) 335 dev->capabilities |= PNP_DISABLE; 336 dev->capabilities |= PNP_READ; 337 if (pnpbios_is_dynamic(dev)) 338 dev->capabilities |= PNP_WRITE; 339 if (dev->flags & PNPBIOS_REMOVABLE) 340 dev->capabilities |= PNP_REMOVABLE; 341 342 /* clear out the damaged flags */ 343 if (!dev->active) 344 pnp_init_resources(dev); 345 346 error = pnp_add_device(dev); 347 if (error) { 348 put_device(&dev->dev); 349 return error; 350 } 351 352 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 (pnpbios_disabled || dmi_check_system(pnpbios_dmi_table) || 523 paravirt_enabled()) { 524 printk(KERN_INFO "PnPBIOS: Disabled\n"); 525 return -ENODEV; 526 } 527 #ifdef CONFIG_PNPACPI 528 if (!acpi_disabled && !pnpacpi_disabled) { 529 pnpbios_disabled = 1; 530 printk(KERN_INFO "PnPBIOS: Disabled by ACPI PNP\n"); 531 return -ENODEV; 532 } 533 #endif /* CONFIG_ACPI */ 534 535 /* scan the system for pnpbios support */ 536 if (!pnpbios_probe_system()) 537 return -ENODEV; 538 539 /* make preparations for bios calls */ 540 pnpbios_calls_init(pnp_bios_install); 541 542 /* read the node info */ 543 ret = pnp_bios_dev_node_info(&node_info); 544 if (ret) { 545 printk(KERN_ERR 546 "PnPBIOS: Unable to get node info. Aborting.\n"); 547 return ret; 548 } 549 550 /* register with the pnp layer */ 551 ret = pnp_register_protocol(&pnpbios_protocol); 552 if (ret) { 553 printk(KERN_ERR 554 "PnPBIOS: Unable to register driver. Aborting.\n"); 555 return ret; 556 } 557 558 /* start the proc interface */ 559 ret = pnpbios_proc_init(); 560 if (ret) 561 printk(KERN_ERR "PnPBIOS: Failed to create proc interface.\n"); 562 563 /* scan for pnpbios devices */ 564 build_devlist(); 565 566 pnp_platform_devices = 1; 567 return 0; 568 } 569 570 fs_initcall(pnpbios_init); 571 572 static int __init pnpbios_thread_init(void) 573 { 574 struct task_struct *task; 575 576 if (pnpbios_disabled) 577 return 0; 578 579 init_completion(&unload_sem); 580 task = kthread_run(pnp_dock_thread, NULL, "kpnpbiosd"); 581 if (IS_ERR(task)) 582 return PTR_ERR(task); 583 584 return 0; 585 } 586 587 /* Start the kernel thread later: */ 588 module_init(pnpbios_thread_init); 589 590 EXPORT_SYMBOL(pnpbios_protocol); 591