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
pnp_bios_present(void)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 */
pnp_dock_event(int dock,struct pnp_docking_station_info * info)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 */
pnp_dock_thread(void * unused)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
pnpbios_get_resources(struct pnp_dev * dev)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
pnpbios_set_resources(struct pnp_dev * dev)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
pnpbios_zero_data_stream(struct pnp_bios_node * node)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
pnpbios_disable_resources(struct pnp_dev * dev)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
insert_device(struct pnp_bios_node * node)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
build_devlist(void)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
pnpbios_setup(char * str)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
pnpbios_probe_system(void)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
exploding_pnp_bios(const struct dmi_system_id * d)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
pnpbios_init(void)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
pnpbios_thread_init(void)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