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Commit | Line | Data |
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1da177e4 LT |
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 | */ | |
9dd78466 | 35 | |
1da177e4 LT |
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> | |
1da177e4 LT |
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> | |
7dfb7103 | 64 | #include <linux/freezer.h> |
db9c02fa | 65 | #include <linux/kthread.h> |
1da177e4 LT |
66 | |
67 | #include <asm/page.h> | |
68 | #include <asm/desc.h> | |
69 | #include <asm/system.h> | |
70 | #include <asm/byteorder.h> | |
71 | ||
1692b27b | 72 | #include "../base.h" |
1da177e4 LT |
73 | #include "pnpbios.h" |
74 | ||
1da177e4 LT |
75 | /* |
76 | * | |
77 | * PnP BIOS INTERFACE | |
78 | * | |
79 | */ | |
80 | ||
9dd78466 | 81 | static union pnp_bios_install_struct *pnp_bios_install = NULL; |
1da177e4 LT |
82 | |
83 | int pnp_bios_present(void) | |
84 | { | |
85 | return (pnp_bios_install != NULL); | |
86 | } | |
87 | ||
88 | struct pnp_dev_node_info node_info; | |
89 | ||
1da177e4 LT |
90 | /* |
91 | * | |
92 | * DOCKING FUNCTIONS | |
93 | * | |
94 | */ | |
95 | ||
96 | #ifdef CONFIG_HOTPLUG | |
97 | ||
98 | static int unloading = 0; | |
99 | static struct completion unload_sem; | |
100 | ||
101 | /* | |
102 | * (Much of this belongs in a shared routine somewhere) | |
103 | */ | |
1da177e4 LT |
104 | static int pnp_dock_event(int dock, struct pnp_docking_station_info *info) |
105 | { | |
9dd78466 | 106 | char *argv[3], **envp, *buf, *scratch; |
1da177e4 LT |
107 | int i = 0, value; |
108 | ||
07d4e9af | 109 | if (!(envp = kcalloc(20, sizeof(char *), GFP_KERNEL))) |
1da177e4 | 110 | return -ENOMEM; |
cd861280 | 111 | if (!(buf = kzalloc(256, GFP_KERNEL))) { |
9dd78466 | 112 | kfree(envp); |
1da177e4 LT |
113 | return -ENOMEM; |
114 | } | |
115 | ||
07d4e9af BH |
116 | /* FIXME: if there are actual users of this, it should be |
117 | * integrated into the driver core and use the usual infrastructure | |
118 | * like sysfs and uevents | |
119 | */ | |
9dd78466 BH |
120 | argv[0] = "/sbin/pnpbios"; |
121 | argv[1] = "dock"; | |
122 | argv[2] = NULL; | |
1da177e4 LT |
123 | |
124 | /* minimal command environment */ | |
9dd78466 BH |
125 | envp[i++] = "HOME=/"; |
126 | envp[i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin"; | |
1da177e4 LT |
127 | |
128 | #ifdef DEBUG | |
129 | /* hint that policy agent should enter no-stdout debug mode */ | |
9dd78466 | 130 | envp[i++] = "DEBUG=kernel"; |
1da177e4 LT |
131 | #endif |
132 | /* extensible set of named bus-specific parameters, | |
133 | * supporting multiple driver selection algorithms. | |
134 | */ | |
135 | scratch = buf; | |
136 | ||
137 | /* action: add, remove */ | |
9dd78466 BH |
138 | envp[i++] = scratch; |
139 | scratch += sprintf(scratch, "ACTION=%s", dock ? "add" : "remove") + 1; | |
1da177e4 LT |
140 | |
141 | /* Report the ident for the dock */ | |
9dd78466 BH |
142 | envp[i++] = scratch; |
143 | scratch += sprintf(scratch, "DOCK=%x/%x/%x", | |
144 | info->location_id, info->serial, info->capabilities); | |
1da177e4 | 145 | envp[i] = NULL; |
9dd78466 | 146 | |
07d4e9af | 147 | value = call_usermodehelper(argv [0], argv, envp, UMH_WAIT_EXEC); |
9dd78466 BH |
148 | kfree(buf); |
149 | kfree(envp); | |
1da177e4 LT |
150 | return 0; |
151 | } | |
152 | ||
153 | /* | |
154 | * Poll the PnP docking at regular intervals | |
155 | */ | |
9dd78466 | 156 | static int pnp_dock_thread(void *unused) |
1da177e4 LT |
157 | { |
158 | static struct pnp_docking_station_info now; | |
159 | int docked = -1, d = 0; | |
07d4e9af | 160 | |
83144186 | 161 | set_freezable(); |
9dd78466 | 162 | while (!unloading) { |
1da177e4 | 163 | int status; |
9dd78466 | 164 | |
1da177e4 LT |
165 | /* |
166 | * Poll every 2 seconds | |
167 | */ | |
168 | msleep_interruptible(2000); | |
169 | ||
db9c02fa EB |
170 | if (try_to_freeze()) |
171 | continue; | |
1da177e4 LT |
172 | |
173 | status = pnp_bios_dock_station_info(&now); | |
174 | ||
9dd78466 | 175 | switch (status) { |
1da177e4 LT |
176 | /* |
177 | * No dock to manage | |
178 | */ | |
9dd78466 BH |
179 | case PNP_FUNCTION_NOT_SUPPORTED: |
180 | complete_and_exit(&unload_sem, 0); | |
181 | case PNP_SYSTEM_NOT_DOCKED: | |
182 | d = 0; | |
183 | break; | |
184 | case PNP_SUCCESS: | |
185 | d = 1; | |
186 | break; | |
187 | default: | |
188 | pnpbios_print_status("pnp_dock_thread", status); | |
189 | continue; | |
1da177e4 | 190 | } |
9dd78466 BH |
191 | if (d != docked) { |
192 | if (pnp_dock_event(d, &now) == 0) { | |
1da177e4 LT |
193 | docked = d; |
194 | #if 0 | |
9dd78466 BH |
195 | printk(KERN_INFO |
196 | "PnPBIOS: Docking station %stached\n", | |
197 | docked ? "at" : "de"); | |
1da177e4 LT |
198 | #endif |
199 | } | |
200 | } | |
201 | } | |
202 | complete_and_exit(&unload_sem, 0); | |
203 | } | |
204 | ||
07d4e9af | 205 | #endif /* CONFIG_HOTPLUG */ |
1da177e4 | 206 | |
9dd78466 BH |
207 | static int pnpbios_get_resources(struct pnp_dev *dev, |
208 | struct pnp_resource_table *res) | |
1da177e4 LT |
209 | { |
210 | u8 nodenum = dev->number; | |
9dd78466 | 211 | struct pnp_bios_node *node; |
1da177e4 | 212 | |
9dd78466 | 213 | if (!pnpbios_is_dynamic(dev)) |
1da177e4 LT |
214 | return -EPERM; |
215 | ||
cd861280 | 216 | node = kzalloc(node_info.max_node_size, GFP_KERNEL); |
1da177e4 LT |
217 | if (!node) |
218 | return -1; | |
9dd78466 | 219 | if (pnp_bios_get_dev_node(&nodenum, (char)PNPMODE_DYNAMIC, node)) { |
1da177e4 LT |
220 | kfree(node); |
221 | return -ENODEV; | |
222 | } | |
223 | pnpbios_read_resources_from_node(res, node); | |
224 | dev->active = pnp_is_active(dev); | |
225 | kfree(node); | |
226 | return 0; | |
227 | } | |
228 | ||
9dd78466 BH |
229 | static int pnpbios_set_resources(struct pnp_dev *dev, |
230 | struct pnp_resource_table *res) | |
1da177e4 LT |
231 | { |
232 | u8 nodenum = dev->number; | |
9dd78466 | 233 | struct pnp_bios_node *node; |
1da177e4 LT |
234 | int ret; |
235 | ||
1da177e4 LT |
236 | if (!pnpbios_is_dynamic(dev)) |
237 | return -EPERM; | |
238 | ||
cd861280 | 239 | node = kzalloc(node_info.max_node_size, GFP_KERNEL); |
1da177e4 LT |
240 | if (!node) |
241 | return -1; | |
9dd78466 | 242 | if (pnp_bios_get_dev_node(&nodenum, (char)PNPMODE_DYNAMIC, node)) { |
1da177e4 LT |
243 | kfree(node); |
244 | return -ENODEV; | |
245 | } | |
9dd78466 | 246 | if (pnpbios_write_resources_to_node(res, node) < 0) { |
1da177e4 LT |
247 | kfree(node); |
248 | return -1; | |
249 | } | |
250 | ret = pnp_bios_set_dev_node(node->handle, (char)PNPMODE_DYNAMIC, node); | |
251 | kfree(node); | |
252 | if (ret > 0) | |
253 | ret = -1; | |
254 | return ret; | |
255 | } | |
256 | ||
9dd78466 | 257 | static void pnpbios_zero_data_stream(struct pnp_bios_node *node) |
1da177e4 | 258 | { |
9dd78466 BH |
259 | unsigned char *p = (char *)node->data; |
260 | unsigned char *end = (char *)(node->data + node->size); | |
1da177e4 LT |
261 | unsigned int len; |
262 | int i; | |
07d4e9af | 263 | |
1da177e4 | 264 | while ((char *)p < (char *)end) { |
9dd78466 | 265 | if (p[0] & 0x80) { /* large tag */ |
1da177e4 LT |
266 | len = (p[2] << 8) | p[1]; |
267 | p += 3; | |
268 | } else { | |
9dd78466 | 269 | if (((p[0] >> 3) & 0x0f) == 0x0f) |
1da177e4 LT |
270 | return; |
271 | len = p[0] & 0x07; | |
272 | p += 1; | |
273 | } | |
274 | for (i = 0; i < len; i++) | |
275 | p[i] = 0; | |
276 | p += len; | |
277 | } | |
9dd78466 BH |
278 | printk(KERN_ERR |
279 | "PnPBIOS: Resource structure did not contain an end tag.\n"); | |
1da177e4 LT |
280 | } |
281 | ||
282 | static int pnpbios_disable_resources(struct pnp_dev *dev) | |
283 | { | |
9dd78466 | 284 | struct pnp_bios_node *node; |
1da177e4 LT |
285 | u8 nodenum = dev->number; |
286 | int ret; | |
287 | ||
9dd78466 | 288 | if (dev->flags & PNPBIOS_NO_DISABLE || !pnpbios_is_dynamic(dev)) |
1da177e4 LT |
289 | return -EPERM; |
290 | ||
cd861280 | 291 | node = kzalloc(node_info.max_node_size, GFP_KERNEL); |
1da177e4 LT |
292 | if (!node) |
293 | return -ENOMEM; | |
294 | ||
9dd78466 | 295 | if (pnp_bios_get_dev_node(&nodenum, (char)PNPMODE_DYNAMIC, node)) { |
1da177e4 LT |
296 | kfree(node); |
297 | return -ENODEV; | |
298 | } | |
299 | pnpbios_zero_data_stream(node); | |
300 | ||
301 | ret = pnp_bios_set_dev_node(dev->number, (char)PNPMODE_DYNAMIC, node); | |
302 | kfree(node); | |
303 | if (ret > 0) | |
304 | ret = -1; | |
305 | return ret; | |
306 | } | |
307 | ||
308 | /* PnP Layer support */ | |
309 | ||
310 | struct pnp_protocol pnpbios_protocol = { | |
9dd78466 BH |
311 | .name = "Plug and Play BIOS", |
312 | .get = pnpbios_get_resources, | |
313 | .set = pnpbios_set_resources, | |
1da177e4 LT |
314 | .disable = pnpbios_disable_resources, |
315 | }; | |
316 | ||
2bb9a6b3 | 317 | static int __init insert_device(struct pnp_bios_node *node) |
1da177e4 | 318 | { |
9dd78466 | 319 | struct list_head *pos; |
36405e96 | 320 | struct pnp_dev *dev; |
1da177e4 LT |
321 | char id[8]; |
322 | ||
323 | /* check if the device is already added */ | |
9dd78466 | 324 | list_for_each(pos, &pnpbios_protocol.devices) { |
36405e96 BH |
325 | dev = list_entry(pos, struct pnp_dev, protocol_list); |
326 | if (dev->number == node->handle) | |
1da177e4 LT |
327 | return -1; |
328 | } | |
329 | ||
25eb8461 | 330 | pnp_eisa_id_to_string(node->eisa_id & PNP_EISA_ID_MASK, id); |
bda1e4e5 BH |
331 | dev = pnp_alloc_dev(&pnpbios_protocol, node->handle, id); |
332 | if (!dev) | |
1da177e4 | 333 | return -1; |
36405e96 | 334 | |
1da177e4 LT |
335 | pnpbios_parse_data_stream(dev, node); |
336 | dev->active = pnp_is_active(dev); | |
337 | dev->flags = node->flags; | |
338 | if (!(dev->flags & PNPBIOS_NO_CONFIG)) | |
339 | dev->capabilities |= PNP_CONFIGURABLE; | |
3ae19208 | 340 | if (!(dev->flags & PNPBIOS_NO_DISABLE) && pnpbios_is_dynamic(dev)) |
1da177e4 LT |
341 | dev->capabilities |= PNP_DISABLE; |
342 | dev->capabilities |= PNP_READ; | |
343 | if (pnpbios_is_dynamic(dev)) | |
344 | dev->capabilities |= PNP_WRITE; | |
345 | if (dev->flags & PNPBIOS_REMOVABLE) | |
346 | dev->capabilities |= PNP_REMOVABLE; | |
1da177e4 LT |
347 | |
348 | /* clear out the damaged flags */ | |
349 | if (!dev->active) | |
350 | pnp_init_resource_table(&dev->res); | |
351 | ||
352 | pnp_add_device(dev); | |
353 | pnpbios_interface_attach_device(node); | |
354 | ||
355 | return 0; | |
356 | } | |
357 | ||
358 | static void __init build_devlist(void) | |
359 | { | |
360 | u8 nodenum; | |
361 | unsigned int nodes_got = 0; | |
362 | unsigned int devs = 0; | |
363 | struct pnp_bios_node *node; | |
1da177e4 | 364 | |
cd861280 | 365 | node = kzalloc(node_info.max_node_size, GFP_KERNEL); |
1da177e4 LT |
366 | if (!node) |
367 | return; | |
368 | ||
9dd78466 | 369 | for (nodenum = 0; nodenum < 0xff;) { |
1da177e4 LT |
370 | u8 thisnodenum = nodenum; |
371 | /* eventually we will want to use PNPMODE_STATIC here but for now | |
372 | * dynamic will help us catch buggy bioses to add to the blacklist. | |
373 | */ | |
374 | if (!pnpbios_dont_use_current_config) { | |
9dd78466 BH |
375 | if (pnp_bios_get_dev_node |
376 | (&nodenum, (char)PNPMODE_DYNAMIC, node)) | |
1da177e4 LT |
377 | break; |
378 | } else { | |
9dd78466 BH |
379 | if (pnp_bios_get_dev_node |
380 | (&nodenum, (char)PNPMODE_STATIC, node)) | |
1da177e4 LT |
381 | break; |
382 | } | |
383 | nodes_got++; | |
36405e96 | 384 | if (insert_device(node) == 0) |
1da177e4 LT |
385 | devs++; |
386 | if (nodenum <= thisnodenum) { | |
9dd78466 BH |
387 | printk(KERN_ERR |
388 | "PnPBIOS: build_devlist: Node number 0x%x is out of sequence following node 0x%x. Aborting.\n", | |
389 | (unsigned int)nodenum, | |
390 | (unsigned int)thisnodenum); | |
1da177e4 LT |
391 | break; |
392 | } | |
393 | } | |
394 | kfree(node); | |
395 | ||
9dd78466 BH |
396 | printk(KERN_INFO |
397 | "PnPBIOS: %i node%s reported by PnP BIOS; %i recorded by driver\n", | |
398 | nodes_got, nodes_got != 1 ? "s" : "", devs); | |
1da177e4 LT |
399 | } |
400 | ||
401 | /* | |
402 | * | |
403 | * INIT AND EXIT | |
404 | * | |
405 | */ | |
406 | ||
07d4e9af BH |
407 | static int pnpbios_disabled; |
408 | int pnpbios_dont_use_current_config; | |
1da177e4 | 409 | |
1da177e4 LT |
410 | static int __init pnpbios_setup(char *str) |
411 | { | |
412 | int invert; | |
413 | ||
414 | while ((str != NULL) && (*str != '\0')) { | |
415 | if (strncmp(str, "off", 3) == 0) | |
9dd78466 | 416 | pnpbios_disabled = 1; |
1da177e4 | 417 | if (strncmp(str, "on", 2) == 0) |
9dd78466 | 418 | pnpbios_disabled = 0; |
1da177e4 LT |
419 | invert = (strncmp(str, "no-", 3) == 0); |
420 | if (invert) | |
421 | str += 3; | |
422 | if (strncmp(str, "curr", 4) == 0) | |
423 | pnpbios_dont_use_current_config = invert; | |
424 | str = strchr(str, ','); | |
425 | if (str != NULL) | |
426 | str += strspn(str, ", \t"); | |
427 | } | |
428 | ||
429 | return 1; | |
430 | } | |
431 | ||
432 | __setup("pnpbios=", pnpbios_setup); | |
1da177e4 LT |
433 | |
434 | /* PnP BIOS signature: "$PnP" */ | |
435 | #define PNP_SIGNATURE (('$' << 0) + ('P' << 8) + ('n' << 16) + ('P' << 24)) | |
436 | ||
437 | static int __init pnpbios_probe_system(void) | |
438 | { | |
439 | union pnp_bios_install_struct *check; | |
440 | u8 sum; | |
441 | int length, i; | |
442 | ||
443 | printk(KERN_INFO "PnPBIOS: Scanning system for PnP BIOS support...\n"); | |
444 | ||
445 | /* | |
9dd78466 | 446 | * Search the defined area (0xf0000-0xffff0) for a valid PnP BIOS |
1da177e4 LT |
447 | * structure and, if one is found, sets up the selectors and |
448 | * entry points | |
449 | */ | |
9dd78466 BH |
450 | for (check = (union pnp_bios_install_struct *)__va(0xf0000); |
451 | check < (union pnp_bios_install_struct *)__va(0xffff0); | |
1da177e4 LT |
452 | check = (void *)check + 16) { |
453 | if (check->fields.signature != PNP_SIGNATURE) | |
454 | continue; | |
9dd78466 BH |
455 | printk(KERN_INFO |
456 | "PnPBIOS: Found PnP BIOS installation structure at 0x%p\n", | |
457 | check); | |
1da177e4 LT |
458 | length = check->fields.length; |
459 | if (!length) { | |
9dd78466 BH |
460 | printk(KERN_ERR |
461 | "PnPBIOS: installation structure is invalid, skipping\n"); | |
1da177e4 LT |
462 | continue; |
463 | } | |
464 | for (sum = 0, i = 0; i < length; i++) | |
465 | sum += check->chars[i]; | |
466 | if (sum) { | |
9dd78466 BH |
467 | printk(KERN_ERR |
468 | "PnPBIOS: installation structure is corrupted, skipping\n"); | |
1da177e4 LT |
469 | continue; |
470 | } | |
471 | if (check->fields.version < 0x10) { | |
9dd78466 BH |
472 | printk(KERN_WARNING |
473 | "PnPBIOS: PnP BIOS version %d.%d is not supported\n", | |
1da177e4 LT |
474 | check->fields.version >> 4, |
475 | check->fields.version & 15); | |
476 | continue; | |
477 | } | |
9dd78466 BH |
478 | printk(KERN_INFO |
479 | "PnPBIOS: PnP BIOS version %d.%d, entry 0x%x:0x%x, dseg 0x%x\n", | |
480 | check->fields.version >> 4, check->fields.version & 15, | |
1da177e4 LT |
481 | check->fields.pm16cseg, check->fields.pm16offset, |
482 | check->fields.pm16dseg); | |
483 | pnp_bios_install = check; | |
484 | return 1; | |
485 | } | |
486 | ||
487 | printk(KERN_INFO "PnPBIOS: PnP BIOS support was not detected.\n"); | |
488 | return 0; | |
489 | } | |
490 | ||
1855256c | 491 | static int __init exploding_pnp_bios(const struct dmi_system_id *d) |
1da177e4 LT |
492 | { |
493 | printk(KERN_WARNING "%s detected. Disabling PnPBIOS\n", d->ident); | |
494 | return 0; | |
495 | } | |
496 | ||
ffbe5523 | 497 | static struct dmi_system_id pnpbios_dmi_table[] __initdata = { |
9dd78466 BH |
498 | { /* PnPBIOS GPF on boot */ |
499 | .callback = exploding_pnp_bios, | |
500 | .ident = "Higraded P14H", | |
501 | .matches = { | |
502 | DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."), | |
503 | DMI_MATCH(DMI_BIOS_VERSION, "07.00T"), | |
504 | DMI_MATCH(DMI_SYS_VENDOR, "Higraded"), | |
505 | DMI_MATCH(DMI_PRODUCT_NAME, "P14H"), | |
506 | }, | |
507 | }, | |
508 | { /* PnPBIOS GPF on boot */ | |
509 | .callback = exploding_pnp_bios, | |
510 | .ident = "ASUS P4P800", | |
511 | .matches = { | |
512 | DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer Inc."), | |
513 | DMI_MATCH(DMI_BOARD_NAME, "P4P800"), | |
514 | }, | |
515 | }, | |
516 | {} | |
1da177e4 LT |
517 | }; |
518 | ||
519 | static int __init pnpbios_init(void) | |
520 | { | |
521 | int ret; | |
522 | ||
30cbc222 OH |
523 | #if defined(CONFIG_PPC_MERGE) |
524 | if (check_legacy_ioport(PNPBIOS_BASE)) | |
525 | return -ENODEV; | |
526 | #endif | |
6020c8f3 RR |
527 | if (pnpbios_disabled || dmi_check_system(pnpbios_dmi_table) || |
528 | paravirt_enabled()) { | |
1da177e4 LT |
529 | printk(KERN_INFO "PnPBIOS: Disabled\n"); |
530 | return -ENODEV; | |
531 | } | |
1da177e4 LT |
532 | #ifdef CONFIG_PNPACPI |
533 | if (!acpi_disabled && !pnpacpi_disabled) { | |
534 | pnpbios_disabled = 1; | |
535 | printk(KERN_INFO "PnPBIOS: Disabled by ACPI PNP\n"); | |
536 | return -ENODEV; | |
537 | } | |
07d4e9af | 538 | #endif /* CONFIG_ACPI */ |
1da177e4 LT |
539 | |
540 | /* scan the system for pnpbios support */ | |
541 | if (!pnpbios_probe_system()) | |
542 | return -ENODEV; | |
543 | ||
544 | /* make preparations for bios calls */ | |
545 | pnpbios_calls_init(pnp_bios_install); | |
546 | ||
547 | /* read the node info */ | |
548 | ret = pnp_bios_dev_node_info(&node_info); | |
549 | if (ret) { | |
9dd78466 BH |
550 | printk(KERN_ERR |
551 | "PnPBIOS: Unable to get node info. Aborting.\n"); | |
1da177e4 LT |
552 | return ret; |
553 | } | |
554 | ||
555 | /* register with the pnp layer */ | |
556 | ret = pnp_register_protocol(&pnpbios_protocol); | |
557 | if (ret) { | |
9dd78466 BH |
558 | printk(KERN_ERR |
559 | "PnPBIOS: Unable to register driver. Aborting.\n"); | |
1da177e4 LT |
560 | return ret; |
561 | } | |
562 | ||
563 | /* start the proc interface */ | |
564 | ret = pnpbios_proc_init(); | |
565 | if (ret) | |
566 | printk(KERN_ERR "PnPBIOS: Failed to create proc interface.\n"); | |
567 | ||
568 | /* scan for pnpbios devices */ | |
569 | build_devlist(); | |
570 | ||
8f81dd14 | 571 | pnp_platform_devices = 1; |
1da177e4 LT |
572 | return 0; |
573 | } | |
574 | ||
575 | subsys_initcall(pnpbios_init); | |
576 | ||
577 | static int __init pnpbios_thread_init(void) | |
578 | { | |
db9c02fa | 579 | struct task_struct *task; |
1e0aa9ad | 580 | |
30cbc222 OH |
581 | #if defined(CONFIG_PPC_MERGE) |
582 | if (check_legacy_ioport(PNPBIOS_BASE)) | |
583 | return 0; | |
584 | #endif | |
1da177e4 LT |
585 | if (pnpbios_disabled) |
586 | return 0; | |
587 | #ifdef CONFIG_HOTPLUG | |
588 | init_completion(&unload_sem); | |
db9c02fa EB |
589 | task = kthread_run(pnp_dock_thread, NULL, "kpnpbiosd"); |
590 | if (!IS_ERR(task)) | |
1da177e4 LT |
591 | unloading = 0; |
592 | #endif | |
593 | return 0; | |
594 | } | |
595 | ||
1da177e4 LT |
596 | /* Start the kernel thread later: */ |
597 | module_init(pnpbios_thread_init); | |
598 | ||
1da177e4 | 599 | EXPORT_SYMBOL(pnpbios_protocol); |