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 <jdthood@mail.com>
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/pnpbios.h>
54 #include <linux/device.h>
55 #include <linux/pnp.h>
56 #include <linux/mm.h>
57 #include <linux/smp.h>
58 #include <linux/slab.h>
59 #include <linux/kobject_uevent.h>
60 #include <linux/completion.h>
61 #include <linux/spinlock.h>
62 #include <linux/dmi.h>
63 #include <linux/delay.h>
64 #include <linux/acpi.h>
65
66 #include <asm/page.h>
67 #include <asm/desc.h>
68 #include <asm/system.h>
69 #include <asm/byteorder.h>
70
71 #include "pnpbios.h"
72
73
74 /*
75 *
76 * PnP BIOS INTERFACE
77 *
78 */
79
80 static union pnp_bios_install_struct * pnp_bios_install = NULL;
81
82 int pnp_bios_present(void)
83 {
84 return (pnp_bios_install != NULL);
85 }
86
87 struct pnp_dev_node_info node_info;
88
89 void *pnpbios_kmalloc(size_t size, int f)
90 {
91 void *p = kmalloc( size, f );
92 if ( p == NULL )
93 printk(KERN_ERR "PnPBIOS: kmalloc() failed\n");
94 else
95 memset(p, 0, size);
96 return p;
97 }
98
99 /*
100 *
101 * DOCKING FUNCTIONS
102 *
103 */
104
105 #ifdef CONFIG_HOTPLUG
106
107 static int unloading = 0;
108 static struct completion unload_sem;
109
110 /*
111 * (Much of this belongs in a shared routine somewhere)
112 */
113
114 static int pnp_dock_event(int dock, struct pnp_docking_station_info *info)
115 {
116 char *argv [3], **envp, *buf, *scratch;
117 int i = 0, value;
118
119 if (!hotplug_path [0])
120 return -ENOENT;
121 if (!current->fs->root) {
122 return -EAGAIN;
123 }
124 if (!(envp = (char **) pnpbios_kmalloc (20 * sizeof (char *), GFP_KERNEL))) {
125 return -ENOMEM;
126 }
127 if (!(buf = pnpbios_kmalloc (256, GFP_KERNEL))) {
128 kfree (envp);
129 return -ENOMEM;
130 }
131
132 /* only one standardized param to hotplug command: type */
133 argv [0] = hotplug_path;
134 argv [1] = "dock";
135 argv [2] = NULL;
136
137 /* minimal command environment */
138 envp [i++] = "HOME=/";
139 envp [i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
140
141 #ifdef DEBUG
142 /* hint that policy agent should enter no-stdout debug mode */
143 envp [i++] = "DEBUG=kernel";
144 #endif
145 /* extensible set of named bus-specific parameters,
146 * supporting multiple driver selection algorithms.
147 */
148 scratch = buf;
149
150 /* action: add, remove */
151 envp [i++] = scratch;
152 scratch += sprintf (scratch, "ACTION=%s", dock?"add":"remove") + 1;
153
154 /* Report the ident for the dock */
155 envp [i++] = scratch;
156 scratch += sprintf (scratch, "DOCK=%x/%x/%x",
157 info->location_id, info->serial, info->capabilities);
158 envp[i] = NULL;
159
160 value = call_usermodehelper (argv [0], argv, envp, 0);
161 kfree (buf);
162 kfree (envp);
163 return 0;
164 }
165
166 /*
167 * Poll the PnP docking at regular intervals
168 */
169 static int pnp_dock_thread(void * unused)
170 {
171 static struct pnp_docking_station_info now;
172 int docked = -1, d = 0;
173 daemonize("kpnpbiosd");
174 allow_signal(SIGKILL);
175 while(!unloading && !signal_pending(current))
176 {
177 int status;
178
179 /*
180 * Poll every 2 seconds
181 */
182 msleep_interruptible(2000);
183 if(signal_pending(current))
184 break;
185
186 status = pnp_bios_dock_station_info(&now);
187
188 switch(status)
189 {
190 /*
191 * No dock to manage
192 */
193 case PNP_FUNCTION_NOT_SUPPORTED:
194 complete_and_exit(&unload_sem, 0);
195 case PNP_SYSTEM_NOT_DOCKED:
196 d = 0;
197 break;
198 case PNP_SUCCESS:
199 d = 1;
200 break;
201 default:
202 pnpbios_print_status( "pnp_dock_thread", status );
203 continue;
204 }
205 if(d != docked)
206 {
207 if(pnp_dock_event(d, &now)==0)
208 {
209 docked = d;
210 #if 0
211 printk(KERN_INFO "PnPBIOS: Docking station %stached\n", docked?"at":"de");
212 #endif
213 }
214 }
215 }
216 complete_and_exit(&unload_sem, 0);
217 }
218
219 #endif /* CONFIG_HOTPLUG */
220
221 static int pnpbios_get_resources(struct pnp_dev * dev, struct pnp_resource_table * res)
222 {
223 u8 nodenum = dev->number;
224 struct pnp_bios_node * node;
225
226 /* just in case */
227 if(!pnpbios_is_dynamic(dev))
228 return -EPERM;
229
230 node = pnpbios_kmalloc(node_info.max_node_size, GFP_KERNEL);
231 if (!node)
232 return -1;
233 if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_DYNAMIC, node)) {
234 kfree(node);
235 return -ENODEV;
236 }
237 pnpbios_read_resources_from_node(res, node);
238 dev->active = pnp_is_active(dev);
239 kfree(node);
240 return 0;
241 }
242
243 static int pnpbios_set_resources(struct pnp_dev * dev, struct pnp_resource_table * res)
244 {
245 u8 nodenum = dev->number;
246 struct pnp_bios_node * node;
247 int ret;
248
249 /* just in case */
250 if (!pnpbios_is_dynamic(dev))
251 return -EPERM;
252
253 node = pnpbios_kmalloc(node_info.max_node_size, GFP_KERNEL);
254 if (!node)
255 return -1;
256 if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_DYNAMIC, node)) {
257 kfree(node);
258 return -ENODEV;
259 }
260 if(pnpbios_write_resources_to_node(res, node)<0) {
261 kfree(node);
262 return -1;
263 }
264 ret = pnp_bios_set_dev_node(node->handle, (char)PNPMODE_DYNAMIC, node);
265 kfree(node);
266 if (ret > 0)
267 ret = -1;
268 return ret;
269 }
270
271 static void pnpbios_zero_data_stream(struct pnp_bios_node * node)
272 {
273 unsigned char * p = (char *)node->data;
274 unsigned char * end = (char *)(node->data + node->size);
275 unsigned int len;
276 int i;
277 while ((char *)p < (char *)end) {
278 if(p[0] & 0x80) { /* large tag */
279 len = (p[2] << 8) | p[1];
280 p += 3;
281 } else {
282 if (((p[0]>>3) & 0x0f) == 0x0f)
283 return;
284 len = p[0] & 0x07;
285 p += 1;
286 }
287 for (i = 0; i < len; i++)
288 p[i] = 0;
289 p += len;
290 }
291 printk(KERN_ERR "PnPBIOS: Resource structure did not contain an end tag.\n");
292 }
293
294 static int pnpbios_disable_resources(struct pnp_dev *dev)
295 {
296 struct pnp_bios_node * node;
297 u8 nodenum = dev->number;
298 int ret;
299
300 /* just in case */
301 if(dev->flags & PNPBIOS_NO_DISABLE || !pnpbios_is_dynamic(dev))
302 return -EPERM;
303
304 node = pnpbios_kmalloc(node_info.max_node_size, GFP_KERNEL);
305 if (!node)
306 return -ENOMEM;
307
308 if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_DYNAMIC, node)) {
309 kfree(node);
310 return -ENODEV;
311 }
312 pnpbios_zero_data_stream(node);
313
314 ret = pnp_bios_set_dev_node(dev->number, (char)PNPMODE_DYNAMIC, node);
315 kfree(node);
316 if (ret > 0)
317 ret = -1;
318 return ret;
319 }
320
321 /* PnP Layer support */
322
323 struct pnp_protocol pnpbios_protocol = {
324 .name = "Plug and Play BIOS",
325 .get = pnpbios_get_resources,
326 .set = pnpbios_set_resources,
327 .disable = pnpbios_disable_resources,
328 };
329
330 static int insert_device(struct pnp_dev *dev, struct pnp_bios_node * node)
331 {
332 struct list_head * pos;
333 struct pnp_dev * pnp_dev;
334 struct pnp_id *dev_id;
335 char id[8];
336
337 /* check if the device is already added */
338 dev->number = node->handle;
339 list_for_each (pos, &pnpbios_protocol.devices){
340 pnp_dev = list_entry(pos, struct pnp_dev, protocol_list);
341 if (dev->number == pnp_dev->number)
342 return -1;
343 }
344
345 /* set the initial values for the PnP device */
346 dev_id = pnpbios_kmalloc(sizeof(struct pnp_id), GFP_KERNEL);
347 if (!dev_id)
348 return -1;
349 pnpid32_to_pnpid(node->eisa_id,id);
350 memcpy(dev_id->id,id,7);
351 pnp_add_id(dev_id, dev);
352 pnpbios_parse_data_stream(dev, node);
353 dev->active = pnp_is_active(dev);
354 dev->flags = node->flags;
355 if (!(dev->flags & PNPBIOS_NO_CONFIG))
356 dev->capabilities |= PNP_CONFIGURABLE;
357 if (!(dev->flags & PNPBIOS_NO_DISABLE))
358 dev->capabilities |= PNP_DISABLE;
359 dev->capabilities |= PNP_READ;
360 if (pnpbios_is_dynamic(dev))
361 dev->capabilities |= PNP_WRITE;
362 if (dev->flags & PNPBIOS_REMOVABLE)
363 dev->capabilities |= PNP_REMOVABLE;
364 dev->protocol = &pnpbios_protocol;
365
366 /* clear out the damaged flags */
367 if (!dev->active)
368 pnp_init_resource_table(&dev->res);
369
370 pnp_add_device(dev);
371 pnpbios_interface_attach_device(node);
372
373 return 0;
374 }
375
376 static void __init build_devlist(void)
377 {
378 u8 nodenum;
379 unsigned int nodes_got = 0;
380 unsigned int devs = 0;
381 struct pnp_bios_node *node;
382 struct pnp_dev *dev;
383
384 node = pnpbios_kmalloc(node_info.max_node_size, GFP_KERNEL);
385 if (!node)
386 return;
387
388 for(nodenum=0; nodenum<0xff; ) {
389 u8 thisnodenum = nodenum;
390 /* eventually we will want to use PNPMODE_STATIC here but for now
391 * dynamic will help us catch buggy bioses to add to the blacklist.
392 */
393 if (!pnpbios_dont_use_current_config) {
394 if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_DYNAMIC, node))
395 break;
396 } else {
397 if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_STATIC, node))
398 break;
399 }
400 nodes_got++;
401 dev = pnpbios_kmalloc(sizeof (struct pnp_dev), GFP_KERNEL);
402 if (!dev)
403 break;
404 if(insert_device(dev,node)<0)
405 kfree(dev);
406 else
407 devs++;
408 if (nodenum <= thisnodenum) {
409 printk(KERN_ERR "PnPBIOS: build_devlist: Node number 0x%x is out of sequence following node 0x%x. Aborting.\n", (unsigned int)nodenum, (unsigned int)thisnodenum);
410 break;
411 }
412 }
413 kfree(node);
414
415 printk(KERN_INFO "PnPBIOS: %i node%s reported by PnP BIOS; %i recorded by driver\n",
416 nodes_got, nodes_got != 1 ? "s" : "", devs);
417 }
418
419 /*
420 *
421 * INIT AND EXIT
422 *
423 */
424
425 static int pnpbios_disabled; /* = 0 */
426 int pnpbios_dont_use_current_config; /* = 0 */
427
428 #ifndef MODULE
429 static int __init pnpbios_setup(char *str)
430 {
431 int invert;
432
433 while ((str != NULL) && (*str != '\0')) {
434 if (strncmp(str, "off", 3) == 0)
435 pnpbios_disabled=1;
436 if (strncmp(str, "on", 2) == 0)
437 pnpbios_disabled=0;
438 invert = (strncmp(str, "no-", 3) == 0);
439 if (invert)
440 str += 3;
441 if (strncmp(str, "curr", 4) == 0)
442 pnpbios_dont_use_current_config = invert;
443 str = strchr(str, ',');
444 if (str != NULL)
445 str += strspn(str, ", \t");
446 }
447
448 return 1;
449 }
450
451 __setup("pnpbios=", pnpbios_setup);
452 #endif
453
454 /* PnP BIOS signature: "$PnP" */
455 #define PNP_SIGNATURE (('$' << 0) + ('P' << 8) + ('n' << 16) + ('P' << 24))
456
457 int __init pnpbios_probe_system(void)
458 {
459 union pnp_bios_install_struct *check;
460 u8 sum;
461 int length, i;
462
463 printk(KERN_INFO "PnPBIOS: Scanning system for PnP BIOS support...\n");
464
465 /*
466 * Search the defined area (0xf0000-0xffff0) for a valid PnP BIOS
467 * structure and, if one is found, sets up the selectors and
468 * entry points
469 */
470 for (check = (union pnp_bios_install_struct *) __va(0xf0000);
471 check < (union pnp_bios_install_struct *) __va(0xffff0);
472 check = (void *)check + 16) {
473 if (check->fields.signature != PNP_SIGNATURE)
474 continue;
475 printk(KERN_INFO "PnPBIOS: Found PnP BIOS installation structure at 0x%p\n", check);
476 length = check->fields.length;
477 if (!length) {
478 printk(KERN_ERR "PnPBIOS: installation structure is invalid, skipping\n");
479 continue;
480 }
481 for (sum = 0, i = 0; i < length; i++)
482 sum += check->chars[i];
483 if (sum) {
484 printk(KERN_ERR "PnPBIOS: installation structure is corrupted, skipping\n");
485 continue;
486 }
487 if (check->fields.version < 0x10) {
488 printk(KERN_WARNING "PnPBIOS: PnP BIOS version %d.%d is not supported\n",
489 check->fields.version >> 4,
490 check->fields.version & 15);
491 continue;
492 }
493 printk(KERN_INFO "PnPBIOS: PnP BIOS version %d.%d, entry 0x%x:0x%x, dseg 0x%x\n",
494 check->fields.version >> 4, check->fields.version & 15,
495 check->fields.pm16cseg, check->fields.pm16offset,
496 check->fields.pm16dseg);
497 pnp_bios_install = check;
498 return 1;
499 }
500
501 printk(KERN_INFO "PnPBIOS: PnP BIOS support was not detected.\n");
502 return 0;
503 }
504
505 static int __init exploding_pnp_bios(struct dmi_system_id *d)
506 {
507 printk(KERN_WARNING "%s detected. Disabling PnPBIOS\n", d->ident);
508 return 0;
509 }
510
511 static struct dmi_system_id pnpbios_dmi_table[] = {
512 { /* PnPBIOS GPF on boot */
513 .callback = exploding_pnp_bios,
514 .ident = "Higraded P14H",
515 .matches = {
516 DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
517 DMI_MATCH(DMI_BIOS_VERSION, "07.00T"),
518 DMI_MATCH(DMI_SYS_VENDOR, "Higraded"),
519 DMI_MATCH(DMI_PRODUCT_NAME, "P14H"),
520 },
521 },
522 { /* PnPBIOS GPF on boot */
523 .callback = exploding_pnp_bios,
524 .ident = "ASUS P4P800",
525 .matches = {
526 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer Inc."),
527 DMI_MATCH(DMI_BOARD_NAME, "P4P800"),
528 },
529 },
530 { }
531 };
532
533 int __init pnpbios_init(void)
534 {
535 int ret;
536
537 if (pnpbios_disabled || dmi_check_system(pnpbios_dmi_table)) {
538 printk(KERN_INFO "PnPBIOS: Disabled\n");
539 return -ENODEV;
540 }
541
542 #ifdef CONFIG_PNPACPI
543 if (!acpi_disabled && !pnpacpi_disabled) {
544 pnpbios_disabled = 1;
545 printk(KERN_INFO "PnPBIOS: Disabled by ACPI PNP\n");
546 return -ENODEV;
547 }
548 #endif /* CONFIG_ACPI */
549
550 /* scan the system for pnpbios support */
551 if (!pnpbios_probe_system())
552 return -ENODEV;
553
554 /* make preparations for bios calls */
555 pnpbios_calls_init(pnp_bios_install);
556
557 /* read the node info */
558 ret = pnp_bios_dev_node_info(&node_info);
559 if (ret) {
560 printk(KERN_ERR "PnPBIOS: Unable to get node info. Aborting.\n");
561 return ret;
562 }
563
564 /* register with the pnp layer */
565 ret = pnp_register_protocol(&pnpbios_protocol);
566 if (ret) {
567 printk(KERN_ERR "PnPBIOS: Unable to register driver. Aborting.\n");
568 return ret;
569 }
570
571 /* start the proc interface */
572 ret = pnpbios_proc_init();
573 if (ret)
574 printk(KERN_ERR "PnPBIOS: Failed to create proc interface.\n");
575
576 /* scan for pnpbios devices */
577 build_devlist();
578
579 return 0;
580 }
581
582 subsys_initcall(pnpbios_init);
583
584 static int __init pnpbios_thread_init(void)
585 {
586 if (pnpbios_disabled)
587 return 0;
588 #ifdef CONFIG_HOTPLUG
589 init_completion(&unload_sem);
590 if (kernel_thread(pnp_dock_thread, NULL, CLONE_KERNEL) > 0)
591 unloading = 0;
592 #endif
593 return 0;
594 }
595
596 #ifndef MODULE
597
598 /* init/main.c calls pnpbios_init early */
599
600 /* Start the kernel thread later: */
601 module_init(pnpbios_thread_init);
602
603 #else
604
605 /*
606 * N.B.: Building pnpbios as a module hasn't been fully implemented
607 */
608
609 MODULE_LICENSE("GPL");
610
611 static int __init pnpbios_init_all(void)
612 {
613 int r;
614
615 r = pnpbios_init();
616 if (r)
617 return r;
618 r = pnpbios_thread_init();
619 if (r)
620 return r;
621 return 0;
622 }
623
624 static void __exit pnpbios_exit(void)
625 {
626 #ifdef CONFIG_HOTPLUG
627 unloading = 1;
628 wait_for_completion(&unload_sem);
629 #endif
630 pnpbios_proc_exit();
631 /* We ought to free resources here */
632 return;
633 }
634
635 module_init(pnpbios_init_all);
636 module_exit(pnpbios_exit);
637
638 #endif
639
640 EXPORT_SYMBOL(pnpbios_protocol);
641
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