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 #ifdef CONFIG_HOTPLUG 95 96 static struct completion unload_sem; 97 98 /* 99 * (Much of this belongs in a shared routine somewhere) 100 */ 101 static int pnp_dock_event(int dock, struct pnp_docking_station_info *info) 102 { 103 char *argv[3], **envp, *buf, *scratch; 104 int i = 0, value; 105 106 if (!(envp = kcalloc(20, sizeof(char *), GFP_KERNEL))) 107 return -ENOMEM; 108 if (!(buf = kzalloc(256, GFP_KERNEL))) { 109 kfree(envp); 110 return -ENOMEM; 111 } 112 113 /* FIXME: if there are actual users of this, it should be 114 * integrated into the driver core and use the usual infrastructure 115 * like sysfs and uevents 116 */ 117 argv[0] = "/sbin/pnpbios"; 118 argv[1] = "dock"; 119 argv[2] = NULL; 120 121 /* minimal command environment */ 122 envp[i++] = "HOME=/"; 123 envp[i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin"; 124 125 #ifdef DEBUG 126 /* hint that policy agent should enter no-stdout debug mode */ 127 envp[i++] = "DEBUG=kernel"; 128 #endif 129 /* extensible set of named bus-specific parameters, 130 * supporting multiple driver selection algorithms. 131 */ 132 scratch = buf; 133 134 /* action: add, remove */ 135 envp[i++] = scratch; 136 scratch += sprintf(scratch, "ACTION=%s", dock ? "add" : "remove") + 1; 137 138 /* Report the ident for the dock */ 139 envp[i++] = scratch; 140 scratch += sprintf(scratch, "DOCK=%x/%x/%x", 141 info->location_id, info->serial, info->capabilities); 142 envp[i] = NULL; 143 144 value = call_usermodehelper(argv [0], argv, envp, UMH_WAIT_EXEC); 145 kfree(buf); 146 kfree(envp); 147 return 0; 148 } 149 150 /* 151 * Poll the PnP docking at regular intervals 152 */ 153 static int pnp_dock_thread(void *unused) 154 { 155 static struct pnp_docking_station_info now; 156 int docked = -1, d = 0; 157 158 set_freezable(); 159 while (1) { 160 int status; 161 162 /* 163 * Poll every 2 seconds 164 */ 165 msleep_interruptible(2000); 166 167 if (try_to_freeze()) 168 continue; 169 170 status = pnp_bios_dock_station_info(&now); 171 172 switch (status) { 173 /* 174 * No dock to manage 175 */ 176 case PNP_FUNCTION_NOT_SUPPORTED: 177 complete_and_exit(&unload_sem, 0); 178 case PNP_SYSTEM_NOT_DOCKED: 179 d = 0; 180 break; 181 case PNP_SUCCESS: 182 d = 1; 183 break; 184 default: 185 pnpbios_print_status("pnp_dock_thread", status); 186 continue; 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 #endif /* CONFIG_HOTPLUG */ 203 204 static int pnpbios_get_resources(struct pnp_dev *dev) 205 { 206 u8 nodenum = dev->number; 207 struct pnp_bios_node *node; 208 209 if (!pnpbios_is_dynamic(dev)) 210 return -EPERM; 211 212 pnp_dbg(&dev->dev, "get resources\n"); 213 node = kzalloc(node_info.max_node_size, GFP_KERNEL); 214 if (!node) 215 return -1; 216 if (pnp_bios_get_dev_node(&nodenum, (char)PNPMODE_DYNAMIC, node)) { 217 kfree(node); 218 return -ENODEV; 219 } 220 pnpbios_read_resources_from_node(dev, node); 221 dev->active = pnp_is_active(dev); 222 kfree(node); 223 return 0; 224 } 225 226 static int pnpbios_set_resources(struct pnp_dev *dev) 227 { 228 u8 nodenum = dev->number; 229 struct pnp_bios_node *node; 230 int ret; 231 232 if (!pnpbios_is_dynamic(dev)) 233 return -EPERM; 234 235 pnp_dbg(&dev->dev, "set resources\n"); 236 node = kzalloc(node_info.max_node_size, GFP_KERNEL); 237 if (!node) 238 return -1; 239 if (pnp_bios_get_dev_node(&nodenum, (char)PNPMODE_DYNAMIC, node)) { 240 kfree(node); 241 return -ENODEV; 242 } 243 if (pnpbios_write_resources_to_node(dev, node) < 0) { 244 kfree(node); 245 return -1; 246 } 247 ret = pnp_bios_set_dev_node(node->handle, (char)PNPMODE_DYNAMIC, node); 248 kfree(node); 249 if (ret > 0) 250 ret = -1; 251 return ret; 252 } 253 254 static void pnpbios_zero_data_stream(struct pnp_bios_node *node) 255 { 256 unsigned char *p = (char *)node->data; 257 unsigned char *end = (char *)(node->data + node->size); 258 unsigned int len; 259 int i; 260 261 while ((char *)p < (char *)end) { 262 if (p[0] & 0x80) { /* large tag */ 263 len = (p[2] << 8) | p[1]; 264 p += 3; 265 } else { 266 if (((p[0] >> 3) & 0x0f) == 0x0f) 267 return; 268 len = p[0] & 0x07; 269 p += 1; 270 } 271 for (i = 0; i < len; i++) 272 p[i] = 0; 273 p += len; 274 } 275 printk(KERN_ERR 276 "PnPBIOS: Resource structure did not contain an end tag.\n"); 277 } 278 279 static int pnpbios_disable_resources(struct pnp_dev *dev) 280 { 281 struct pnp_bios_node *node; 282 u8 nodenum = dev->number; 283 int ret; 284 285 if (dev->flags & PNPBIOS_NO_DISABLE || !pnpbios_is_dynamic(dev)) 286 return -EPERM; 287 288 node = kzalloc(node_info.max_node_size, GFP_KERNEL); 289 if (!node) 290 return -ENOMEM; 291 292 if (pnp_bios_get_dev_node(&nodenum, (char)PNPMODE_DYNAMIC, node)) { 293 kfree(node); 294 return -ENODEV; 295 } 296 pnpbios_zero_data_stream(node); 297 298 ret = pnp_bios_set_dev_node(dev->number, (char)PNPMODE_DYNAMIC, node); 299 kfree(node); 300 if (ret > 0) 301 ret = -1; 302 return ret; 303 } 304 305 /* PnP Layer support */ 306 307 struct pnp_protocol pnpbios_protocol = { 308 .name = "Plug and Play BIOS", 309 .get = pnpbios_get_resources, 310 .set = pnpbios_set_resources, 311 .disable = pnpbios_disable_resources, 312 }; 313 314 static int __init insert_device(struct pnp_bios_node *node) 315 { 316 struct list_head *pos; 317 struct pnp_dev *dev; 318 char id[8]; 319 320 /* check if the device is already added */ 321 list_for_each(pos, &pnpbios_protocol.devices) { 322 dev = list_entry(pos, struct pnp_dev, protocol_list); 323 if (dev->number == node->handle) 324 return -1; 325 } 326 327 pnp_eisa_id_to_string(node->eisa_id & PNP_EISA_ID_MASK, id); 328 dev = pnp_alloc_dev(&pnpbios_protocol, node->handle, id); 329 if (!dev) 330 return -1; 331 332 pnpbios_parse_data_stream(dev, node); 333 dev->active = pnp_is_active(dev); 334 dev->flags = node->flags; 335 if (!(dev->flags & PNPBIOS_NO_CONFIG)) 336 dev->capabilities |= PNP_CONFIGURABLE; 337 if (!(dev->flags & PNPBIOS_NO_DISABLE) && pnpbios_is_dynamic(dev)) 338 dev->capabilities |= PNP_DISABLE; 339 dev->capabilities |= PNP_READ; 340 if (pnpbios_is_dynamic(dev)) 341 dev->capabilities |= PNP_WRITE; 342 if (dev->flags & PNPBIOS_REMOVABLE) 343 dev->capabilities |= PNP_REMOVABLE; 344 345 /* clear out the damaged flags */ 346 if (!dev->active) 347 pnp_init_resources(dev); 348 349 pnp_add_device(dev); 350 pnpbios_interface_attach_device(node); 351 352 return 0; 353 } 354 355 static void __init build_devlist(void) 356 { 357 u8 nodenum; 358 unsigned int nodes_got = 0; 359 unsigned int devs = 0; 360 struct pnp_bios_node *node; 361 362 node = kzalloc(node_info.max_node_size, GFP_KERNEL); 363 if (!node) 364 return; 365 366 for (nodenum = 0; nodenum < 0xff;) { 367 u8 thisnodenum = nodenum; 368 /* eventually we will want to use PNPMODE_STATIC here but for now 369 * dynamic will help us catch buggy bioses to add to the blacklist. 370 */ 371 if (!pnpbios_dont_use_current_config) { 372 if (pnp_bios_get_dev_node 373 (&nodenum, (char)PNPMODE_DYNAMIC, node)) 374 break; 375 } else { 376 if (pnp_bios_get_dev_node 377 (&nodenum, (char)PNPMODE_STATIC, node)) 378 break; 379 } 380 nodes_got++; 381 if (insert_device(node) == 0) 382 devs++; 383 if (nodenum <= thisnodenum) { 384 printk(KERN_ERR 385 "PnPBIOS: build_devlist: Node number 0x%x is out of sequence following node 0x%x. Aborting.\n", 386 (unsigned int)nodenum, 387 (unsigned int)thisnodenum); 388 break; 389 } 390 } 391 kfree(node); 392 393 printk(KERN_INFO 394 "PnPBIOS: %i node%s reported by PnP BIOS; %i recorded by driver\n", 395 nodes_got, nodes_got != 1 ? "s" : "", devs); 396 } 397 398 /* 399 * 400 * INIT AND EXIT 401 * 402 */ 403 404 static int pnpbios_disabled; 405 int pnpbios_dont_use_current_config; 406 407 static int __init pnpbios_setup(char *str) 408 { 409 int invert; 410 411 while ((str != NULL) && (*str != '\0')) { 412 if (strncmp(str, "off", 3) == 0) 413 pnpbios_disabled = 1; 414 if (strncmp(str, "on", 2) == 0) 415 pnpbios_disabled = 0; 416 invert = (strncmp(str, "no-", 3) == 0); 417 if (invert) 418 str += 3; 419 if (strncmp(str, "curr", 4) == 0) 420 pnpbios_dont_use_current_config = invert; 421 str = strchr(str, ','); 422 if (str != NULL) 423 str += strspn(str, ", \t"); 424 } 425 426 return 1; 427 } 428 429 __setup("pnpbios=", pnpbios_setup); 430 431 /* PnP BIOS signature: "$PnP" */ 432 #define PNP_SIGNATURE (('$' << 0) + ('P' << 8) + ('n' << 16) + ('P' << 24)) 433 434 static int __init pnpbios_probe_system(void) 435 { 436 union pnp_bios_install_struct *check; 437 u8 sum; 438 int length, i; 439 440 printk(KERN_INFO "PnPBIOS: Scanning system for PnP BIOS support...\n"); 441 442 /* 443 * Search the defined area (0xf0000-0xffff0) for a valid PnP BIOS 444 * structure and, if one is found, sets up the selectors and 445 * entry points 446 */ 447 for (check = (union pnp_bios_install_struct *)__va(0xf0000); 448 check < (union pnp_bios_install_struct *)__va(0xffff0); 449 check = (void *)check + 16) { 450 if (check->fields.signature != PNP_SIGNATURE) 451 continue; 452 printk(KERN_INFO 453 "PnPBIOS: Found PnP BIOS installation structure at 0x%p\n", 454 check); 455 length = check->fields.length; 456 if (!length) { 457 printk(KERN_ERR 458 "PnPBIOS: installation structure is invalid, skipping\n"); 459 continue; 460 } 461 for (sum = 0, i = 0; i < length; i++) 462 sum += check->chars[i]; 463 if (sum) { 464 printk(KERN_ERR 465 "PnPBIOS: installation structure is corrupted, skipping\n"); 466 continue; 467 } 468 if (check->fields.version < 0x10) { 469 printk(KERN_WARNING 470 "PnPBIOS: PnP BIOS version %d.%d is not supported\n", 471 check->fields.version >> 4, 472 check->fields.version & 15); 473 continue; 474 } 475 printk(KERN_INFO 476 "PnPBIOS: PnP BIOS version %d.%d, entry 0x%x:0x%x, dseg 0x%x\n", 477 check->fields.version >> 4, check->fields.version & 15, 478 check->fields.pm16cseg, check->fields.pm16offset, 479 check->fields.pm16dseg); 480 pnp_bios_install = check; 481 return 1; 482 } 483 484 printk(KERN_INFO "PnPBIOS: PnP BIOS support was not detected.\n"); 485 return 0; 486 } 487 488 static int __init exploding_pnp_bios(const struct dmi_system_id *d) 489 { 490 printk(KERN_WARNING "%s detected. Disabling PnPBIOS\n", d->ident); 491 return 0; 492 } 493 494 static struct dmi_system_id pnpbios_dmi_table[] __initdata = { 495 { /* PnPBIOS GPF on boot */ 496 .callback = exploding_pnp_bios, 497 .ident = "Higraded P14H", 498 .matches = { 499 DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."), 500 DMI_MATCH(DMI_BIOS_VERSION, "07.00T"), 501 DMI_MATCH(DMI_SYS_VENDOR, "Higraded"), 502 DMI_MATCH(DMI_PRODUCT_NAME, "P14H"), 503 }, 504 }, 505 { /* PnPBIOS GPF on boot */ 506 .callback = exploding_pnp_bios, 507 .ident = "ASUS P4P800", 508 .matches = { 509 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer Inc."), 510 DMI_MATCH(DMI_BOARD_NAME, "P4P800"), 511 }, 512 }, 513 {} 514 }; 515 516 static int __init pnpbios_init(void) 517 { 518 int ret; 519 520 #if defined(CONFIG_PPC) 521 if (check_legacy_ioport(PNPBIOS_BASE)) 522 return -ENODEV; 523 #endif 524 if (pnpbios_disabled || dmi_check_system(pnpbios_dmi_table) || 525 paravirt_enabled()) { 526 printk(KERN_INFO "PnPBIOS: Disabled\n"); 527 return -ENODEV; 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 #if defined(CONFIG_PPC) 577 if (check_legacy_ioport(PNPBIOS_BASE)) 578 return 0; 579 #endif 580 if (pnpbios_disabled) 581 return 0; 582 #ifdef CONFIG_HOTPLUG 583 { 584 struct task_struct *task; 585 init_completion(&unload_sem); 586 task = kthread_run(pnp_dock_thread, NULL, "kpnpbiosd"); 587 if (IS_ERR(task)) 588 return PTR_ERR(task); 589 } 590 #endif 591 return 0; 592 } 593 594 /* Start the kernel thread later: */ 595 module_init(pnpbios_thread_init); 596 597 EXPORT_SYMBOL(pnpbios_protocol); 598