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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/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
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 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 */
151static 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
200static 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
222static 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
250static 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
275static 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
303struct 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
310static 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
357static 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
406static int pnpbios_disabled;
407int pnpbios_dont_use_current_config;
408
409static 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
436static 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
490static 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
496static 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
518static 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
570fs_initcall(pnpbios_init);
571
572static 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: */
588module_init(pnpbios_thread_init);
589
590EXPORT_SYMBOL(pnpbios_protocol);
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
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
94#ifdef CONFIG_HOTPLUG
95
96static struct completion unload_sem;
97
98/*
99 * (Much of this belongs in a shared routine somewhere)
100 */
101static 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 */
153static 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
204static 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
226static 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
254static 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
279static 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
307struct 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
314static 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
355static 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
404static int pnpbios_disabled;
405int pnpbios_dont_use_current_config;
406
407static 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
434static 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
488static 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
494static 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
516static 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
572fs_initcall(pnpbios_init);
573
574static 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: */
595module_init(pnpbios_thread_init);
596
597EXPORT_SYMBOL(pnpbios_protocol);