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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
79static union pnp_bios_install_struct *pnp_bios_install = NULL;
80
81int pnp_bios_present(void)
82{
83 return (pnp_bios_install != NULL);
84}
85
86struct pnp_dev_node_info node_info;
87
88/*
89 *
90 * DOCKING FUNCTIONS
91 *
92 */
93
94static struct completion unload_sem;
95
96/*
97 * (Much of this belongs in a shared routine somewhere)
98 */
99static 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 */
152static 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
202static 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
224static 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
252static 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
277static 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
305struct 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
312static 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
359static 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
408static int pnpbios_disabled;
409int pnpbios_dont_use_current_config;
410
411static 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
438static 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
492static 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
498static 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
520static 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
573fs_initcall(pnpbios_init);
574
575static 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: */
588device_initcall(pnpbios_thread_init);
589
590EXPORT_SYMBOL(pnpbios_protocol);
591

Warning: That file was not part of the compilation database. It may have many parsing errors.