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/system.h>
69 #include <asm/byteorder.h>
70
71 #include "../base.h"
72 #include "pnpbios.h"
73
74 /*
75 *
76 * PnP BIOS INTERFACE
77 *
78 */
79
80 static union pnp_bios_install_struct *pnp_bios_install = NULL;
81
pnp_bios_present(void)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 /*
90 *
91 * DOCKING FUNCTIONS
92 *
93 */
94
95 #ifdef CONFIG_HOTPLUG
96
97 static struct completion unload_sem;
98
99 /*
100 * (Much of this belongs in a shared routine somewhere)
101 */
pnp_dock_event(int dock,struct pnp_docking_station_info * info)102 static int pnp_dock_event(int dock, struct pnp_docking_station_info *info)
103 {
104 char *argv[3], **envp, *buf, *scratch;
105 int i = 0, value;
106
107 if (!(envp = kcalloc(20, sizeof(char *), GFP_KERNEL)))
108 return -ENOMEM;
109 if (!(buf = kzalloc(256, GFP_KERNEL))) {
110 kfree(envp);
111 return -ENOMEM;
112 }
113
114 /* FIXME: if there are actual users of this, it should be
115 * integrated into the driver core and use the usual infrastructure
116 * like sysfs and uevents
117 */
118 argv[0] = "/sbin/pnpbios";
119 argv[1] = "dock";
120 argv[2] = NULL;
121
122 /* minimal command environment */
123 envp[i++] = "HOME=/";
124 envp[i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
125
126 #ifdef DEBUG
127 /* hint that policy agent should enter no-stdout debug mode */
128 envp[i++] = "DEBUG=kernel";
129 #endif
130 /* extensible set of named bus-specific parameters,
131 * supporting multiple driver selection algorithms.
132 */
133 scratch = buf;
134
135 /* action: add, remove */
136 envp[i++] = scratch;
137 scratch += sprintf(scratch, "ACTION=%s", dock ? "add" : "remove") + 1;
138
139 /* Report the ident for the dock */
140 envp[i++] = scratch;
141 scratch += sprintf(scratch, "DOCK=%x/%x/%x",
142 info->location_id, info->serial, info->capabilities);
143 envp[i] = NULL;
144
145 value = call_usermodehelper(argv [0], argv, envp, UMH_WAIT_EXEC);
146 kfree(buf);
147 kfree(envp);
148 return 0;
149 }
150
151 /*
152 * Poll the PnP docking at regular intervals
153 */
pnp_dock_thread(void * unused)154 static int pnp_dock_thread(void *unused)
155 {
156 static struct pnp_docking_station_info now;
157 int docked = -1, d = 0;
158
159 set_freezable();
160 while (1) {
161 int status;
162
163 /*
164 * Poll every 2 seconds
165 */
166 msleep_interruptible(2000);
167
168 if (try_to_freeze())
169 continue;
170
171 status = pnp_bios_dock_station_info(&now);
172
173 switch (status) {
174 /*
175 * No dock to manage
176 */
177 case PNP_FUNCTION_NOT_SUPPORTED:
178 complete_and_exit(&unload_sem, 0);
179 case PNP_SYSTEM_NOT_DOCKED:
180 d = 0;
181 break;
182 case PNP_SUCCESS:
183 d = 1;
184 break;
185 default:
186 pnpbios_print_status("pnp_dock_thread", status);
187 continue;
188 }
189 if (d != docked) {
190 if (pnp_dock_event(d, &now) == 0) {
191 docked = d;
192 #if 0
193 printk(KERN_INFO
194 "PnPBIOS: Docking station %stached\n",
195 docked ? "at" : "de");
196 #endif
197 }
198 }
199 }
200 complete_and_exit(&unload_sem, 0);
201 }
202
203 #endif /* CONFIG_HOTPLUG */
204
pnpbios_get_resources(struct pnp_dev * dev)205 static int pnpbios_get_resources(struct pnp_dev *dev)
206 {
207 u8 nodenum = dev->number;
208 struct pnp_bios_node *node;
209
210 if (!pnpbios_is_dynamic(dev))
211 return -EPERM;
212
213 pnp_dbg(&dev->dev, "get resources\n");
214 node = kzalloc(node_info.max_node_size, GFP_KERNEL);
215 if (!node)
216 return -1;
217 if (pnp_bios_get_dev_node(&nodenum, (char)PNPMODE_DYNAMIC, node)) {
218 kfree(node);
219 return -ENODEV;
220 }
221 pnpbios_read_resources_from_node(dev, node);
222 dev->active = pnp_is_active(dev);
223 kfree(node);
224 return 0;
225 }
226
pnpbios_set_resources(struct pnp_dev * dev)227 static int pnpbios_set_resources(struct pnp_dev *dev)
228 {
229 u8 nodenum = dev->number;
230 struct pnp_bios_node *node;
231 int ret;
232
233 if (!pnpbios_is_dynamic(dev))
234 return -EPERM;
235
236 pnp_dbg(&dev->dev, "set resources\n");
237 node = kzalloc(node_info.max_node_size, GFP_KERNEL);
238 if (!node)
239 return -1;
240 if (pnp_bios_get_dev_node(&nodenum, (char)PNPMODE_DYNAMIC, node)) {
241 kfree(node);
242 return -ENODEV;
243 }
244 if (pnpbios_write_resources_to_node(dev, node) < 0) {
245 kfree(node);
246 return -1;
247 }
248 ret = pnp_bios_set_dev_node(node->handle, (char)PNPMODE_DYNAMIC, node);
249 kfree(node);
250 if (ret > 0)
251 ret = -1;
252 return ret;
253 }
254
pnpbios_zero_data_stream(struct pnp_bios_node * node)255 static void pnpbios_zero_data_stream(struct pnp_bios_node *node)
256 {
257 unsigned char *p = (char *)node->data;
258 unsigned char *end = (char *)(node->data + node->size);
259 unsigned int len;
260 int i;
261
262 while ((char *)p < (char *)end) {
263 if (p[0] & 0x80) { /* large tag */
264 len = (p[2] << 8) | p[1];
265 p += 3;
266 } else {
267 if (((p[0] >> 3) & 0x0f) == 0x0f)
268 return;
269 len = p[0] & 0x07;
270 p += 1;
271 }
272 for (i = 0; i < len; i++)
273 p[i] = 0;
274 p += len;
275 }
276 printk(KERN_ERR
277 "PnPBIOS: Resource structure did not contain an end tag.\n");
278 }
279
pnpbios_disable_resources(struct pnp_dev * dev)280 static int pnpbios_disable_resources(struct pnp_dev *dev)
281 {
282 struct pnp_bios_node *node;
283 u8 nodenum = dev->number;
284 int ret;
285
286 if (dev->flags & PNPBIOS_NO_DISABLE || !pnpbios_is_dynamic(dev))
287 return -EPERM;
288
289 node = kzalloc(node_info.max_node_size, GFP_KERNEL);
290 if (!node)
291 return -ENOMEM;
292
293 if (pnp_bios_get_dev_node(&nodenum, (char)PNPMODE_DYNAMIC, node)) {
294 kfree(node);
295 return -ENODEV;
296 }
297 pnpbios_zero_data_stream(node);
298
299 ret = pnp_bios_set_dev_node(dev->number, (char)PNPMODE_DYNAMIC, node);
300 kfree(node);
301 if (ret > 0)
302 ret = -1;
303 return ret;
304 }
305
306 /* PnP Layer support */
307
308 struct pnp_protocol pnpbios_protocol = {
309 .name = "Plug and Play BIOS",
310 .get = pnpbios_get_resources,
311 .set = pnpbios_set_resources,
312 .disable = pnpbios_disable_resources,
313 };
314
insert_device(struct pnp_bios_node * node)315 static int __init insert_device(struct pnp_bios_node *node)
316 {
317 struct list_head *pos;
318 struct pnp_dev *dev;
319 char id[8];
320
321 /* check if the device is already added */
322 list_for_each(pos, &pnpbios_protocol.devices) {
323 dev = list_entry(pos, struct pnp_dev, protocol_list);
324 if (dev->number == node->handle)
325 return -1;
326 }
327
328 pnp_eisa_id_to_string(node->eisa_id & PNP_EISA_ID_MASK, id);
329 dev = pnp_alloc_dev(&pnpbios_protocol, node->handle, id);
330 if (!dev)
331 return -1;
332
333 pnpbios_parse_data_stream(dev, node);
334 dev->active = pnp_is_active(dev);
335 dev->flags = node->flags;
336 if (!(dev->flags & PNPBIOS_NO_CONFIG))
337 dev->capabilities |= PNP_CONFIGURABLE;
338 if (!(dev->flags & PNPBIOS_NO_DISABLE) && pnpbios_is_dynamic(dev))
339 dev->capabilities |= PNP_DISABLE;
340 dev->capabilities |= PNP_READ;
341 if (pnpbios_is_dynamic(dev))
342 dev->capabilities |= PNP_WRITE;
343 if (dev->flags & PNPBIOS_REMOVABLE)
344 dev->capabilities |= PNP_REMOVABLE;
345
346 /* clear out the damaged flags */
347 if (!dev->active)
348 pnp_init_resources(dev);
349
350 pnp_add_device(dev);
351 pnpbios_interface_attach_device(node);
352
353 return 0;
354 }
355
build_devlist(void)356 static void __init build_devlist(void)
357 {
358 u8 nodenum;
359 unsigned int nodes_got = 0;
360 unsigned int devs = 0;
361 struct pnp_bios_node *node;
362
363 node = kzalloc(node_info.max_node_size, GFP_KERNEL);
364 if (!node)
365 return;
366
367 for (nodenum = 0; nodenum < 0xff;) {
368 u8 thisnodenum = nodenum;
369 /* eventually we will want to use PNPMODE_STATIC here but for now
370 * dynamic will help us catch buggy bioses to add to the blacklist.
371 */
372 if (!pnpbios_dont_use_current_config) {
373 if (pnp_bios_get_dev_node
374 (&nodenum, (char)PNPMODE_DYNAMIC, node))
375 break;
376 } else {
377 if (pnp_bios_get_dev_node
378 (&nodenum, (char)PNPMODE_STATIC, node))
379 break;
380 }
381 nodes_got++;
382 if (insert_device(node) == 0)
383 devs++;
384 if (nodenum <= thisnodenum) {
385 printk(KERN_ERR
386 "PnPBIOS: build_devlist: Node number 0x%x is out of sequence following node 0x%x. Aborting.\n",
387 (unsigned int)nodenum,
388 (unsigned int)thisnodenum);
389 break;
390 }
391 }
392 kfree(node);
393
394 printk(KERN_INFO
395 "PnPBIOS: %i node%s reported by PnP BIOS; %i recorded by driver\n",
396 nodes_got, nodes_got != 1 ? "s" : "", devs);
397 }
398
399 /*
400 *
401 * INIT AND EXIT
402 *
403 */
404
405 static int pnpbios_disabled;
406 int pnpbios_dont_use_current_config;
407
pnpbios_setup(char * str)408 static int __init pnpbios_setup(char *str)
409 {
410 int invert;
411
412 while ((str != NULL) && (*str != '\0')) {
413 if (strncmp(str, "off", 3) == 0)
414 pnpbios_disabled = 1;
415 if (strncmp(str, "on", 2) == 0)
416 pnpbios_disabled = 0;
417 invert = (strncmp(str, "no-", 3) == 0);
418 if (invert)
419 str += 3;
420 if (strncmp(str, "curr", 4) == 0)
421 pnpbios_dont_use_current_config = invert;
422 str = strchr(str, ',');
423 if (str != NULL)
424 str += strspn(str, ", \t");
425 }
426
427 return 1;
428 }
429
430 __setup("pnpbios=", pnpbios_setup);
431
432 /* PnP BIOS signature: "$PnP" */
433 #define PNP_SIGNATURE (('$' << 0) + ('P' << 8) + ('n' << 16) + ('P' << 24))
434
pnpbios_probe_system(void)435 static int __init pnpbios_probe_system(void)
436 {
437 union pnp_bios_install_struct *check;
438 u8 sum;
439 int length, i;
440
441 printk(KERN_INFO "PnPBIOS: Scanning system for PnP BIOS support...\n");
442
443 /*
444 * Search the defined area (0xf0000-0xffff0) for a valid PnP BIOS
445 * structure and, if one is found, sets up the selectors and
446 * entry points
447 */
448 for (check = (union pnp_bios_install_struct *)__va(0xf0000);
449 check < (union pnp_bios_install_struct *)__va(0xffff0);
450 check = (void *)check + 16) {
451 if (check->fields.signature != PNP_SIGNATURE)
452 continue;
453 printk(KERN_INFO
454 "PnPBIOS: Found PnP BIOS installation structure at 0x%p\n",
455 check);
456 length = check->fields.length;
457 if (!length) {
458 printk(KERN_ERR
459 "PnPBIOS: installation structure is invalid, skipping\n");
460 continue;
461 }
462 for (sum = 0, i = 0; i < length; i++)
463 sum += check->chars[i];
464 if (sum) {
465 printk(KERN_ERR
466 "PnPBIOS: installation structure is corrupted, skipping\n");
467 continue;
468 }
469 if (check->fields.version < 0x10) {
470 printk(KERN_WARNING
471 "PnPBIOS: PnP BIOS version %d.%d is not supported\n",
472 check->fields.version >> 4,
473 check->fields.version & 15);
474 continue;
475 }
476 printk(KERN_INFO
477 "PnPBIOS: PnP BIOS version %d.%d, entry 0x%x:0x%x, dseg 0x%x\n",
478 check->fields.version >> 4, check->fields.version & 15,
479 check->fields.pm16cseg, check->fields.pm16offset,
480 check->fields.pm16dseg);
481 pnp_bios_install = check;
482 return 1;
483 }
484
485 printk(KERN_INFO "PnPBIOS: PnP BIOS support was not detected.\n");
486 return 0;
487 }
488
exploding_pnp_bios(const struct dmi_system_id * d)489 static int __init exploding_pnp_bios(const struct dmi_system_id *d)
490 {
491 printk(KERN_WARNING "%s detected. Disabling PnPBIOS\n", d->ident);
492 return 0;
493 }
494
495 static struct dmi_system_id pnpbios_dmi_table[] __initdata = {
496 { /* PnPBIOS GPF on boot */
497 .callback = exploding_pnp_bios,
498 .ident = "Higraded P14H",
499 .matches = {
500 DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
501 DMI_MATCH(DMI_BIOS_VERSION, "07.00T"),
502 DMI_MATCH(DMI_SYS_VENDOR, "Higraded"),
503 DMI_MATCH(DMI_PRODUCT_NAME, "P14H"),
504 },
505 },
506 { /* PnPBIOS GPF on boot */
507 .callback = exploding_pnp_bios,
508 .ident = "ASUS P4P800",
509 .matches = {
510 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer Inc."),
511 DMI_MATCH(DMI_BOARD_NAME, "P4P800"),
512 },
513 },
514 {}
515 };
516
pnpbios_init(void)517 static int __init pnpbios_init(void)
518 {
519 int ret;
520
521 #if defined(CONFIG_PPC)
522 if (check_legacy_ioport(PNPBIOS_BASE))
523 return -ENODEV;
524 #endif
525 if (pnpbios_disabled || dmi_check_system(pnpbios_dmi_table) ||
526 paravirt_enabled()) {
527 printk(KERN_INFO "PnPBIOS: Disabled\n");
528 return -ENODEV;
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
573 fs_initcall(pnpbios_init);
574
pnpbios_thread_init(void)575 static int __init pnpbios_thread_init(void)
576 {
577 #if defined(CONFIG_PPC)
578 if (check_legacy_ioport(PNPBIOS_BASE))
579 return 0;
580 #endif
581 if (pnpbios_disabled)
582 return 0;
583 #ifdef CONFIG_HOTPLUG
584 {
585 struct task_struct *task;
586 init_completion(&unload_sem);
587 task = kthread_run(pnp_dock_thread, NULL, "kpnpbiosd");
588 if (IS_ERR(task))
589 return PTR_ERR(task);
590 }
591 #endif
592 return 0;
593 }
594
595 /* Start the kernel thread later: */
596 module_init(pnpbios_thread_init);
597
598 EXPORT_SYMBOL(pnpbios_protocol);
599