1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
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/completion.h>
60#include <linux/spinlock.h>
61#include <linux/dmi.h>
62#include <linux/delay.h>
63#include <linux/acpi.h>
64#include <linux/freezer.h>
65#include <linux/kthread.h>
66
67#include <asm/page.h>
68#include <asm/desc.h>
69#include <asm/system.h>
70#include <asm/byteorder.h>
71
72#include "pnpbios.h"
73
74
75
76
77
78
79
80static union pnp_bios_install_struct *pnp_bios_install = NULL;
81
82int pnp_bios_present(void)
83{
84 return (pnp_bios_install != NULL);
85}
86
87struct pnp_dev_node_info node_info;
88
89
90
91
92
93
94
95#ifdef CONFIG_HOTPLUG
96
97static int unloading = 0;
98static struct completion unload_sem;
99
100
101
102
103static int pnp_dock_event(int dock, struct pnp_docking_station_info *info)
104{
105 char *argv[3], **envp, *buf, *scratch;
106 int i = 0, value;
107
108 if (!current->fs->root)
109 return -EAGAIN;
110 if (!(envp = kcalloc(20, sizeof(char *), GFP_KERNEL)))
111 return -ENOMEM;
112 if (!(buf = kzalloc(256, GFP_KERNEL))) {
113 kfree(envp);
114 return -ENOMEM;
115 }
116
117
118
119
120
121 argv[0] = "/sbin/pnpbios";
122 argv[1] = "dock";
123 argv[2] = NULL;
124
125
126 envp[i++] = "HOME=/";
127 envp[i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
128
129#ifdef DEBUG
130
131 envp[i++] = "DEBUG=kernel";
132#endif
133
134
135
136 scratch = buf;
137
138
139 envp[i++] = scratch;
140 scratch += sprintf(scratch, "ACTION=%s", dock ? "add" : "remove") + 1;
141
142
143 envp[i++] = scratch;
144 scratch += sprintf(scratch, "DOCK=%x/%x/%x",
145 info->location_id, info->serial, info->capabilities);
146 envp[i] = NULL;
147
148 value = call_usermodehelper(argv [0], argv, envp, UMH_WAIT_EXEC);
149 kfree(buf);
150 kfree(envp);
151 return 0;
152}
153
154
155
156
157static int pnp_dock_thread(void *unused)
158{
159 static struct pnp_docking_station_info now;
160 int docked = -1, d = 0;
161
162 set_freezable();
163 while (!unloading) {
164 int status;
165
166
167
168
169 msleep_interruptible(2000);
170
171 if (try_to_freeze())
172 continue;
173
174 status = pnp_bios_dock_station_info(&now);
175
176 switch (status) {
177
178
179
180 case PNP_FUNCTION_NOT_SUPPORTED:
181 complete_and_exit(&unload_sem, 0);
182 case PNP_SYSTEM_NOT_DOCKED:
183 d = 0;
184 break;
185 case PNP_SUCCESS:
186 d = 1;
187 break;
188 default:
189 pnpbios_print_status("pnp_dock_thread", status);
190 continue;
191 }
192 if (d != docked) {
193 if (pnp_dock_event(d, &now) == 0) {
194 docked = d;
195#if 0
196 printk(KERN_INFO
197 "PnPBIOS: Docking station %stached\n",
198 docked ? "at" : "de");
199#endif
200 }
201 }
202 }
203 complete_and_exit(&unload_sem, 0);
204}
205
206#endif
207
208static int pnpbios_get_resources(struct pnp_dev *dev,
209 struct pnp_resource_table *res)
210{
211 u8 nodenum = dev->number;
212 struct pnp_bios_node *node;
213
214 if (!pnpbios_is_dynamic(dev))
215 return -EPERM;
216
217 node = kzalloc(node_info.max_node_size, GFP_KERNEL);
218 if (!node)
219 return -1;
220 if (pnp_bios_get_dev_node(&nodenum, (char)PNPMODE_DYNAMIC, node)) {
221 kfree(node);
222 return -ENODEV;
223 }
224 pnpbios_read_resources_from_node(res, node);
225 dev->active = pnp_is_active(dev);
226 kfree(node);
227 return 0;
228}
229
230static int pnpbios_set_resources(struct pnp_dev *dev,
231 struct pnp_resource_table *res)
232{
233 u8 nodenum = dev->number;
234 struct pnp_bios_node *node;
235 int ret;
236
237 if (!pnpbios_is_dynamic(dev))
238 return -EPERM;
239
240 node = kzalloc(node_info.max_node_size, GFP_KERNEL);
241 if (!node)
242 return -1;
243 if (pnp_bios_get_dev_node(&nodenum, (char)PNPMODE_DYNAMIC, node)) {
244 kfree(node);
245 return -ENODEV;
246 }
247 if (pnpbios_write_resources_to_node(res, node) < 0) {
248 kfree(node);
249 return -1;
250 }
251 ret = pnp_bios_set_dev_node(node->handle, (char)PNPMODE_DYNAMIC, node);
252 kfree(node);
253 if (ret > 0)
254 ret = -1;
255 return ret;
256}
257
258static void pnpbios_zero_data_stream(struct pnp_bios_node *node)
259{
260 unsigned char *p = (char *)node->data;
261 unsigned char *end = (char *)(node->data + node->size);
262 unsigned int len;
263 int i;
264
265 while ((char *)p < (char *)end) {
266 if (p[0] & 0x80) {
267 len = (p[2] << 8) | p[1];
268 p += 3;
269 } else {
270 if (((p[0] >> 3) & 0x0f) == 0x0f)
271 return;
272 len = p[0] & 0x07;
273 p += 1;
274 }
275 for (i = 0; i < len; i++)
276 p[i] = 0;
277 p += len;
278 }
279 printk(KERN_ERR
280 "PnPBIOS: Resource structure did not contain an end tag.\n");
281}
282
283static int pnpbios_disable_resources(struct pnp_dev *dev)
284{
285 struct pnp_bios_node *node;
286 u8 nodenum = dev->number;
287 int ret;
288
289 if (dev->flags & PNPBIOS_NO_DISABLE || !pnpbios_is_dynamic(dev))
290 return -EPERM;
291
292 node = kzalloc(node_info.max_node_size, GFP_KERNEL);
293 if (!node)
294 return -ENOMEM;
295
296 if (pnp_bios_get_dev_node(&nodenum, (char)PNPMODE_DYNAMIC, node)) {
297 kfree(node);
298 return -ENODEV;
299 }
300 pnpbios_zero_data_stream(node);
301
302 ret = pnp_bios_set_dev_node(dev->number, (char)PNPMODE_DYNAMIC, node);
303 kfree(node);
304 if (ret > 0)
305 ret = -1;
306 return ret;
307}
308
309
310
311struct pnp_protocol pnpbios_protocol = {
312 .name = "Plug and Play BIOS",
313 .get = pnpbios_get_resources,
314 .set = pnpbios_set_resources,
315 .disable = pnpbios_disable_resources,
316};
317
318static int insert_device(struct pnp_bios_node *node)
319{
320 struct list_head *pos;
321 struct pnp_dev *dev;
322 struct pnp_id *dev_id;
323 char id[8];
324
325
326 list_for_each(pos, &pnpbios_protocol.devices) {
327 dev = list_entry(pos, struct pnp_dev, protocol_list);
328 if (dev->number == node->handle)
329 return -1;
330 }
331
332 dev = kzalloc(sizeof(struct pnp_dev), GFP_KERNEL);
333 if (!dev)
334 return -1;
335
336 dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
337 if (!dev_id) {
338 kfree(dev);
339 return -1;
340 }
341
342 dev->number = node->handle;
343 pnpid32_to_pnpid(node->eisa_id, id);
344 memcpy(dev_id->id, id, 7);
345 pnp_add_id(dev_id, dev);
346 pnpbios_parse_data_stream(dev, node);
347 dev->active = pnp_is_active(dev);
348 dev->flags = node->flags;
349 if (!(dev->flags & PNPBIOS_NO_CONFIG))
350 dev->capabilities |= PNP_CONFIGURABLE;
351 if (!(dev->flags & PNPBIOS_NO_DISABLE) && pnpbios_is_dynamic(dev))
352 dev->capabilities |= PNP_DISABLE;
353 dev->capabilities |= PNP_READ;
354 if (pnpbios_is_dynamic(dev))
355 dev->capabilities |= PNP_WRITE;
356 if (dev->flags & PNPBIOS_REMOVABLE)
357 dev->capabilities |= PNP_REMOVABLE;
358 dev->protocol = &pnpbios_protocol;
359
360
361 if (!dev->active)
362 pnp_init_resource_table(&dev->res);
363
364 pnp_add_device(dev);
365 pnpbios_interface_attach_device(node);
366
367 return 0;
368}
369
370static void __init build_devlist(void)
371{
372 u8 nodenum;
373 unsigned int nodes_got = 0;
374 unsigned int devs = 0;
375 struct pnp_bios_node *node;
376
377 node = kzalloc(node_info.max_node_size, GFP_KERNEL);
378 if (!node)
379 return;
380
381 for (nodenum = 0; nodenum < 0xff;) {
382 u8 thisnodenum = nodenum;
383
384
385
386 if (!pnpbios_dont_use_current_config) {
387 if (pnp_bios_get_dev_node
388 (&nodenum, (char)PNPMODE_DYNAMIC, node))
389 break;
390 } else {
391 if (pnp_bios_get_dev_node
392 (&nodenum, (char)PNPMODE_STATIC, node))
393 break;
394 }
395 nodes_got++;
396 if (insert_device(node) == 0)
397 devs++;
398 if (nodenum <= thisnodenum) {
399 printk(KERN_ERR
400 "PnPBIOS: build_devlist: Node number 0x%x is out of sequence following node 0x%x. Aborting.\n",
401 (unsigned int)nodenum,
402 (unsigned int)thisnodenum);
403 break;
404 }
405 }
406 kfree(node);
407
408 printk(KERN_INFO
409 "PnPBIOS: %i node%s reported by PnP BIOS; %i recorded by driver\n",
410 nodes_got, nodes_got != 1 ? "s" : "", devs);
411}
412
413
414
415
416
417
418
419static int pnpbios_disabled;
420int pnpbios_dont_use_current_config;
421
422static int __init pnpbios_setup(char *str)
423{
424 int invert;
425
426 while ((str != NULL) && (*str != '\0')) {
427 if (strncmp(str, "off", 3) == 0)
428 pnpbios_disabled = 1;
429 if (strncmp(str, "on", 2) == 0)
430 pnpbios_disabled = 0;
431 invert = (strncmp(str, "no-", 3) == 0);
432 if (invert)
433 str += 3;
434 if (strncmp(str, "curr", 4) == 0)
435 pnpbios_dont_use_current_config = invert;
436 str = strchr(str, ',');
437 if (str != NULL)
438 str += strspn(str, ", \t");
439 }
440
441 return 1;
442}
443
444__setup("pnpbios=", pnpbios_setup);
445
446
447#define PNP_SIGNATURE (('$' << 0) + ('P' << 8) + ('n' << 16) + ('P' << 24))
448
449static int __init pnpbios_probe_system(void)
450{
451 union pnp_bios_install_struct *check;
452 u8 sum;
453 int length, i;
454
455 printk(KERN_INFO "PnPBIOS: Scanning system for PnP BIOS support...\n");
456
457
458
459
460
461
462 for (check = (union pnp_bios_install_struct *)__va(0xf0000);
463 check < (union pnp_bios_install_struct *)__va(0xffff0);
464 check = (void *)check + 16) {
465 if (check->fields.signature != PNP_SIGNATURE)
466 continue;
467 printk(KERN_INFO
468 "PnPBIOS: Found PnP BIOS installation structure at 0x%p\n",
469 check);
470 length = check->fields.length;
471 if (!length) {
472 printk(KERN_ERR
473 "PnPBIOS: installation structure is invalid, skipping\n");
474 continue;
475 }
476 for (sum = 0, i = 0; i < length; i++)
477 sum += check->chars[i];
478 if (sum) {
479 printk(KERN_ERR
480 "PnPBIOS: installation structure is corrupted, skipping\n");
481 continue;
482 }
483 if (check->fields.version < 0x10) {
484 printk(KERN_WARNING
485 "PnPBIOS: PnP BIOS version %d.%d is not supported\n",
486 check->fields.version >> 4,
487 check->fields.version & 15);
488 continue;
489 }
490 printk(KERN_INFO
491 "PnPBIOS: PnP BIOS version %d.%d, entry 0x%x:0x%x, dseg 0x%x\n",
492 check->fields.version >> 4, check->fields.version & 15,
493 check->fields.pm16cseg, check->fields.pm16offset,
494 check->fields.pm16dseg);
495 pnp_bios_install = check;
496 return 1;
497 }
498
499 printk(KERN_INFO "PnPBIOS: PnP BIOS support was not detected.\n");
500 return 0;
501}
502
503static int __init exploding_pnp_bios(const struct dmi_system_id *d)
504{
505 printk(KERN_WARNING "%s detected. Disabling PnPBIOS\n", d->ident);
506 return 0;
507}
508
509static struct dmi_system_id pnpbios_dmi_table[] __initdata = {
510 {
511 .callback = exploding_pnp_bios,
512 .ident = "Higraded P14H",
513 .matches = {
514 DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
515 DMI_MATCH(DMI_BIOS_VERSION, "07.00T"),
516 DMI_MATCH(DMI_SYS_VENDOR, "Higraded"),
517 DMI_MATCH(DMI_PRODUCT_NAME, "P14H"),
518 },
519 },
520 {
521 .callback = exploding_pnp_bios,
522 .ident = "ASUS P4P800",
523 .matches = {
524 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer Inc."),
525 DMI_MATCH(DMI_BOARD_NAME, "P4P800"),
526 },
527 },
528 {}
529};
530
531static int __init pnpbios_init(void)
532{
533 int ret;
534
535#if defined(CONFIG_PPC_MERGE)
536 if (check_legacy_ioport(PNPBIOS_BASE))
537 return -ENODEV;
538#endif
539 if (pnpbios_disabled || dmi_check_system(pnpbios_dmi_table) ||
540 paravirt_enabled()) {
541 printk(KERN_INFO "PnPBIOS: Disabled\n");
542 return -ENODEV;
543 }
544#ifdef CONFIG_PNPACPI
545 if (!acpi_disabled && !pnpacpi_disabled) {
546 pnpbios_disabled = 1;
547 printk(KERN_INFO "PnPBIOS: Disabled by ACPI PNP\n");
548 return -ENODEV;
549 }
550#endif
551
552
553 if (!pnpbios_probe_system())
554 return -ENODEV;
555
556
557 pnpbios_calls_init(pnp_bios_install);
558
559
560 ret = pnp_bios_dev_node_info(&node_info);
561 if (ret) {
562 printk(KERN_ERR
563 "PnPBIOS: Unable to get node info. Aborting.\n");
564 return ret;
565 }
566
567
568 ret = pnp_register_protocol(&pnpbios_protocol);
569 if (ret) {
570 printk(KERN_ERR
571 "PnPBIOS: Unable to register driver. Aborting.\n");
572 return ret;
573 }
574
575
576 ret = pnpbios_proc_init();
577 if (ret)
578 printk(KERN_ERR "PnPBIOS: Failed to create proc interface.\n");
579
580
581 build_devlist();
582
583 pnp_platform_devices = 1;
584 return 0;
585}
586
587subsys_initcall(pnpbios_init);
588
589static int __init pnpbios_thread_init(void)
590{
591 struct task_struct *task;
592
593#if defined(CONFIG_PPC_MERGE)
594 if (check_legacy_ioport(PNPBIOS_BASE))
595 return 0;
596#endif
597 if (pnpbios_disabled)
598 return 0;
599#ifdef CONFIG_HOTPLUG
600 init_completion(&unload_sem);
601 task = kthread_run(pnp_dock_thread, NULL, "kpnpbiosd");
602 if (!IS_ERR(task))
603 unloading = 0;
604#endif
605 return 0;
606}
607
608
609module_init(pnpbios_thread_init);
610
611EXPORT_SYMBOL(pnpbios_protocol);
612