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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> | |
1da177e4 LT |
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> | |
1da177e4 LT |
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> | |
7dfb7103 | 63 | #include <linux/freezer.h> |
db9c02fa | 64 | #include <linux/kthread.h> |
1da177e4 LT |
65 | |
66 | #include <asm/page.h> | |
67 | #include <asm/desc.h> | |
68 | #include <asm/system.h> | |
69 | #include <asm/byteorder.h> | |
70 | ||
1692b27b | 71 | #include "../base.h" |
1da177e4 LT |
72 | #include "pnpbios.h" |
73 | ||
1da177e4 LT |
74 | /* |
75 | * | |
76 | * PnP BIOS INTERFACE | |
77 | * | |
78 | */ | |
79 | ||
9dd78466 | 80 | static union pnp_bios_install_struct *pnp_bios_install = NULL; |
1da177e4 LT |
81 | |
82 | int pnp_bios_present(void) | |
83 | { | |
84 | return (pnp_bios_install != NULL); | |
85 | } | |
86 | ||
87 | struct pnp_dev_node_info node_info; | |
88 | ||
1da177e4 LT |
89 | /* |
90 | * | |
91 | * DOCKING FUNCTIONS | |
92 | * | |
93 | */ | |
94 | ||
95 | #ifdef CONFIG_HOTPLUG | |
96 | ||
97 | static int unloading = 0; | |
98 | static struct completion unload_sem; | |
99 | ||
100 | /* | |
101 | * (Much of this belongs in a shared routine somewhere) | |
102 | */ | |
1da177e4 LT |
103 | static int pnp_dock_event(int dock, struct pnp_docking_station_info *info) |
104 | { | |
9dd78466 | 105 | char *argv[3], **envp, *buf, *scratch; |
1da177e4 LT |
106 | int i = 0, value; |
107 | ||
07d4e9af | 108 | if (!(envp = kcalloc(20, sizeof(char *), GFP_KERNEL))) |
1da177e4 | 109 | return -ENOMEM; |
cd861280 | 110 | if (!(buf = kzalloc(256, GFP_KERNEL))) { |
9dd78466 | 111 | kfree(envp); |
1da177e4 LT |
112 | return -ENOMEM; |
113 | } | |
114 | ||
07d4e9af BH |
115 | /* FIXME: if there are actual users of this, it should be |
116 | * integrated into the driver core and use the usual infrastructure | |
117 | * like sysfs and uevents | |
118 | */ | |
9dd78466 BH |
119 | argv[0] = "/sbin/pnpbios"; |
120 | argv[1] = "dock"; | |
121 | argv[2] = NULL; | |
1da177e4 LT |
122 | |
123 | /* minimal command environment */ | |
9dd78466 BH |
124 | envp[i++] = "HOME=/"; |
125 | envp[i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin"; | |
1da177e4 LT |
126 | |
127 | #ifdef DEBUG | |
128 | /* hint that policy agent should enter no-stdout debug mode */ | |
9dd78466 | 129 | envp[i++] = "DEBUG=kernel"; |
1da177e4 LT |
130 | #endif |
131 | /* extensible set of named bus-specific parameters, | |
132 | * supporting multiple driver selection algorithms. | |
133 | */ | |
134 | scratch = buf; | |
135 | ||
136 | /* action: add, remove */ | |
9dd78466 BH |
137 | envp[i++] = scratch; |
138 | scratch += sprintf(scratch, "ACTION=%s", dock ? "add" : "remove") + 1; | |
1da177e4 LT |
139 | |
140 | /* Report the ident for the dock */ | |
9dd78466 BH |
141 | envp[i++] = scratch; |
142 | scratch += sprintf(scratch, "DOCK=%x/%x/%x", | |
143 | info->location_id, info->serial, info->capabilities); | |
1da177e4 | 144 | envp[i] = NULL; |
9dd78466 | 145 | |
07d4e9af | 146 | value = call_usermodehelper(argv [0], argv, envp, UMH_WAIT_EXEC); |
9dd78466 BH |
147 | kfree(buf); |
148 | kfree(envp); | |
1da177e4 LT |
149 | return 0; |
150 | } | |
151 | ||
152 | /* | |
153 | * Poll the PnP docking at regular intervals | |
154 | */ | |
9dd78466 | 155 | static int pnp_dock_thread(void *unused) |
1da177e4 LT |
156 | { |
157 | static struct pnp_docking_station_info now; | |
158 | int docked = -1, d = 0; | |
07d4e9af | 159 | |
83144186 | 160 | set_freezable(); |
9dd78466 | 161 | while (!unloading) { |
1da177e4 | 162 | int status; |
9dd78466 | 163 | |
1da177e4 LT |
164 | /* |
165 | * Poll every 2 seconds | |
166 | */ | |
167 | msleep_interruptible(2000); | |
168 | ||
db9c02fa EB |
169 | if (try_to_freeze()) |
170 | continue; | |
1da177e4 LT |
171 | |
172 | status = pnp_bios_dock_station_info(&now); | |
173 | ||
9dd78466 | 174 | switch (status) { |
1da177e4 LT |
175 | /* |
176 | * No dock to manage | |
177 | */ | |
9dd78466 BH |
178 | case PNP_FUNCTION_NOT_SUPPORTED: |
179 | complete_and_exit(&unload_sem, 0); | |
180 | case PNP_SYSTEM_NOT_DOCKED: | |
181 | d = 0; | |
182 | break; | |
183 | case PNP_SUCCESS: | |
184 | d = 1; | |
185 | break; | |
186 | default: | |
187 | pnpbios_print_status("pnp_dock_thread", status); | |
188 | continue; | |
1da177e4 | 189 | } |
9dd78466 BH |
190 | if (d != docked) { |
191 | if (pnp_dock_event(d, &now) == 0) { | |
1da177e4 LT |
192 | docked = d; |
193 | #if 0 | |
9dd78466 BH |
194 | printk(KERN_INFO |
195 | "PnPBIOS: Docking station %stached\n", | |
196 | docked ? "at" : "de"); | |
1da177e4 LT |
197 | #endif |
198 | } | |
199 | } | |
200 | } | |
201 | complete_and_exit(&unload_sem, 0); | |
202 | } | |
203 | ||
07d4e9af | 204 | #endif /* CONFIG_HOTPLUG */ |
1da177e4 | 205 | |
59284cb4 | 206 | static int pnpbios_get_resources(struct pnp_dev *dev) |
1da177e4 LT |
207 | { |
208 | u8 nodenum = dev->number; | |
9dd78466 | 209 | struct pnp_bios_node *node; |
1da177e4 | 210 | |
9dd78466 | 211 | if (!pnpbios_is_dynamic(dev)) |
1da177e4 LT |
212 | return -EPERM; |
213 | ||
72dcc883 | 214 | dev_dbg(&dev->dev, "get resources\n"); |
cd861280 | 215 | node = kzalloc(node_info.max_node_size, GFP_KERNEL); |
1da177e4 LT |
216 | if (!node) |
217 | return -1; | |
9dd78466 | 218 | if (pnp_bios_get_dev_node(&nodenum, (char)PNPMODE_DYNAMIC, node)) { |
1da177e4 LT |
219 | kfree(node); |
220 | return -ENODEV; | |
221 | } | |
4ab55d8d | 222 | pnpbios_read_resources_from_node(dev, node); |
1da177e4 LT |
223 | dev->active = pnp_is_active(dev); |
224 | kfree(node); | |
225 | return 0; | |
226 | } | |
227 | ||
59284cb4 | 228 | static int pnpbios_set_resources(struct pnp_dev *dev) |
1da177e4 LT |
229 | { |
230 | u8 nodenum = dev->number; | |
9dd78466 | 231 | struct pnp_bios_node *node; |
1da177e4 LT |
232 | int ret; |
233 | ||
1da177e4 LT |
234 | if (!pnpbios_is_dynamic(dev)) |
235 | return -EPERM; | |
236 | ||
72dcc883 | 237 | dev_dbg(&dev->dev, "set resources\n"); |
cd861280 | 238 | node = kzalloc(node_info.max_node_size, GFP_KERNEL); |
1da177e4 LT |
239 | if (!node) |
240 | return -1; | |
9dd78466 | 241 | if (pnp_bios_get_dev_node(&nodenum, (char)PNPMODE_DYNAMIC, node)) { |
1da177e4 LT |
242 | kfree(node); |
243 | return -ENODEV; | |
244 | } | |
4ab55d8d | 245 | if (pnpbios_write_resources_to_node(dev, node) < 0) { |
1da177e4 LT |
246 | kfree(node); |
247 | return -1; | |
248 | } | |
249 | ret = pnp_bios_set_dev_node(node->handle, (char)PNPMODE_DYNAMIC, node); | |
250 | kfree(node); | |
251 | if (ret > 0) | |
252 | ret = -1; | |
253 | return ret; | |
254 | } | |
255 | ||
9dd78466 | 256 | static void pnpbios_zero_data_stream(struct pnp_bios_node *node) |
1da177e4 | 257 | { |
9dd78466 BH |
258 | unsigned char *p = (char *)node->data; |
259 | unsigned char *end = (char *)(node->data + node->size); | |
1da177e4 LT |
260 | unsigned int len; |
261 | int i; | |
07d4e9af | 262 | |
1da177e4 | 263 | while ((char *)p < (char *)end) { |
9dd78466 | 264 | if (p[0] & 0x80) { /* large tag */ |
1da177e4 LT |
265 | len = (p[2] << 8) | p[1]; |
266 | p += 3; | |
267 | } else { | |
9dd78466 | 268 | if (((p[0] >> 3) & 0x0f) == 0x0f) |
1da177e4 LT |
269 | return; |
270 | len = p[0] & 0x07; | |
271 | p += 1; | |
272 | } | |
273 | for (i = 0; i < len; i++) | |
274 | p[i] = 0; | |
275 | p += len; | |
276 | } | |
9dd78466 BH |
277 | printk(KERN_ERR |
278 | "PnPBIOS: Resource structure did not contain an end tag.\n"); | |
1da177e4 LT |
279 | } |
280 | ||
281 | static int pnpbios_disable_resources(struct pnp_dev *dev) | |
282 | { | |
9dd78466 | 283 | struct pnp_bios_node *node; |
1da177e4 LT |
284 | u8 nodenum = dev->number; |
285 | int ret; | |
286 | ||
9dd78466 | 287 | if (dev->flags & PNPBIOS_NO_DISABLE || !pnpbios_is_dynamic(dev)) |
1da177e4 LT |
288 | return -EPERM; |
289 | ||
cd861280 | 290 | node = kzalloc(node_info.max_node_size, GFP_KERNEL); |
1da177e4 LT |
291 | if (!node) |
292 | return -ENOMEM; | |
293 | ||
9dd78466 | 294 | if (pnp_bios_get_dev_node(&nodenum, (char)PNPMODE_DYNAMIC, node)) { |
1da177e4 LT |
295 | kfree(node); |
296 | return -ENODEV; | |
297 | } | |
298 | pnpbios_zero_data_stream(node); | |
299 | ||
300 | ret = pnp_bios_set_dev_node(dev->number, (char)PNPMODE_DYNAMIC, node); | |
301 | kfree(node); | |
302 | if (ret > 0) | |
303 | ret = -1; | |
304 | return ret; | |
305 | } | |
306 | ||
307 | /* PnP Layer support */ | |
308 | ||
309 | struct pnp_protocol pnpbios_protocol = { | |
9dd78466 BH |
310 | .name = "Plug and Play BIOS", |
311 | .get = pnpbios_get_resources, | |
312 | .set = pnpbios_set_resources, | |
1da177e4 LT |
313 | .disable = pnpbios_disable_resources, |
314 | }; | |
315 | ||
2bb9a6b3 | 316 | static int __init insert_device(struct pnp_bios_node *node) |
1da177e4 | 317 | { |
9dd78466 | 318 | struct list_head *pos; |
36405e96 | 319 | struct pnp_dev *dev; |
1da177e4 LT |
320 | char id[8]; |
321 | ||
322 | /* check if the device is already added */ | |
9dd78466 | 323 | list_for_each(pos, &pnpbios_protocol.devices) { |
36405e96 BH |
324 | dev = list_entry(pos, struct pnp_dev, protocol_list); |
325 | if (dev->number == node->handle) | |
1da177e4 LT |
326 | return -1; |
327 | } | |
328 | ||
25eb8461 | 329 | pnp_eisa_id_to_string(node->eisa_id & PNP_EISA_ID_MASK, id); |
bda1e4e5 BH |
330 | dev = pnp_alloc_dev(&pnpbios_protocol, node->handle, id); |
331 | if (!dev) | |
1da177e4 | 332 | return -1; |
36405e96 | 333 | |
1da177e4 LT |
334 | pnpbios_parse_data_stream(dev, node); |
335 | dev->active = pnp_is_active(dev); | |
336 | dev->flags = node->flags; | |
337 | if (!(dev->flags & PNPBIOS_NO_CONFIG)) | |
338 | dev->capabilities |= PNP_CONFIGURABLE; | |
3ae19208 | 339 | if (!(dev->flags & PNPBIOS_NO_DISABLE) && pnpbios_is_dynamic(dev)) |
1da177e4 LT |
340 | dev->capabilities |= PNP_DISABLE; |
341 | dev->capabilities |= PNP_READ; | |
342 | if (pnpbios_is_dynamic(dev)) | |
343 | dev->capabilities |= PNP_WRITE; | |
344 | if (dev->flags & PNPBIOS_REMOVABLE) | |
345 | dev->capabilities |= PNP_REMOVABLE; | |
1da177e4 LT |
346 | |
347 | /* clear out the damaged flags */ | |
348 | if (!dev->active) | |
f4490002 | 349 | pnp_init_resources(dev); |
1da177e4 LT |
350 | |
351 | pnp_add_device(dev); | |
352 | pnpbios_interface_attach_device(node); | |
353 | ||
354 | return 0; | |
355 | } | |
356 | ||
357 | static 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; | |
1da177e4 | 363 | |
cd861280 | 364 | node = kzalloc(node_info.max_node_size, GFP_KERNEL); |
1da177e4 LT |
365 | if (!node) |
366 | return; | |
367 | ||
9dd78466 | 368 | for (nodenum = 0; nodenum < 0xff;) { |
1da177e4 LT |
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) { | |
9dd78466 BH |
374 | if (pnp_bios_get_dev_node |
375 | (&nodenum, (char)PNPMODE_DYNAMIC, node)) | |
1da177e4 LT |
376 | break; |
377 | } else { | |
9dd78466 BH |
378 | if (pnp_bios_get_dev_node |
379 | (&nodenum, (char)PNPMODE_STATIC, node)) | |
1da177e4 LT |
380 | break; |
381 | } | |
382 | nodes_got++; | |
36405e96 | 383 | if (insert_device(node) == 0) |
1da177e4 LT |
384 | devs++; |
385 | if (nodenum <= thisnodenum) { | |
9dd78466 BH |
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); | |
1da177e4 LT |
390 | break; |
391 | } | |
392 | } | |
393 | kfree(node); | |
394 | ||
9dd78466 BH |
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); | |
1da177e4 LT |
398 | } |
399 | ||
400 | /* | |
401 | * | |
402 | * INIT AND EXIT | |
403 | * | |
404 | */ | |
405 | ||
07d4e9af BH |
406 | static int pnpbios_disabled; |
407 | int pnpbios_dont_use_current_config; | |
1da177e4 | 408 | |
1da177e4 LT |
409 | static int __init pnpbios_setup(char *str) |
410 | { | |
411 | int invert; | |
412 | ||
413 | while ((str != NULL) && (*str != '\0')) { | |
414 | if (strncmp(str, "off", 3) == 0) | |
9dd78466 | 415 | pnpbios_disabled = 1; |
1da177e4 | 416 | if (strncmp(str, "on", 2) == 0) |
9dd78466 | 417 | pnpbios_disabled = 0; |
1da177e4 LT |
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); | |
1da177e4 LT |
432 | |
433 | /* PnP BIOS signature: "$PnP" */ | |
434 | #define PNP_SIGNATURE (('$' << 0) + ('P' << 8) + ('n' << 16) + ('P' << 24)) | |
435 | ||
436 | static 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 | /* | |
9dd78466 | 445 | * Search the defined area (0xf0000-0xffff0) for a valid PnP BIOS |
1da177e4 LT |
446 | * structure and, if one is found, sets up the selectors and |
447 | * entry points | |
448 | */ | |
9dd78466 BH |
449 | for (check = (union pnp_bios_install_struct *)__va(0xf0000); |
450 | check < (union pnp_bios_install_struct *)__va(0xffff0); | |
1da177e4 LT |
451 | check = (void *)check + 16) { |
452 | if (check->fields.signature != PNP_SIGNATURE) | |
453 | continue; | |
9dd78466 BH |
454 | printk(KERN_INFO |
455 | "PnPBIOS: Found PnP BIOS installation structure at 0x%p\n", | |
456 | check); | |
1da177e4 LT |
457 | length = check->fields.length; |
458 | if (!length) { | |
9dd78466 BH |
459 | printk(KERN_ERR |
460 | "PnPBIOS: installation structure is invalid, skipping\n"); | |
1da177e4 LT |
461 | continue; |
462 | } | |
463 | for (sum = 0, i = 0; i < length; i++) | |
464 | sum += check->chars[i]; | |
465 | if (sum) { | |
9dd78466 BH |
466 | printk(KERN_ERR |
467 | "PnPBIOS: installation structure is corrupted, skipping\n"); | |
1da177e4 LT |
468 | continue; |
469 | } | |
470 | if (check->fields.version < 0x10) { | |
9dd78466 BH |
471 | printk(KERN_WARNING |
472 | "PnPBIOS: PnP BIOS version %d.%d is not supported\n", | |
1da177e4 LT |
473 | check->fields.version >> 4, |
474 | check->fields.version & 15); | |
475 | continue; | |
476 | } | |
9dd78466 BH |
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, | |
1da177e4 LT |
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 | ||
1855256c | 490 | static int __init exploding_pnp_bios(const struct dmi_system_id *d) |
1da177e4 LT |
491 | { |
492 | printk(KERN_WARNING "%s detected. Disabling PnPBIOS\n", d->ident); | |
493 | return 0; | |
494 | } | |
495 | ||
ffbe5523 | 496 | static struct dmi_system_id pnpbios_dmi_table[] __initdata = { |
9dd78466 BH |
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 | {} | |
1da177e4 LT |
516 | }; |
517 | ||
518 | static int __init pnpbios_init(void) | |
519 | { | |
520 | int ret; | |
521 | ||
30cbc222 OH |
522 | #if defined(CONFIG_PPC_MERGE) |
523 | if (check_legacy_ioport(PNPBIOS_BASE)) | |
524 | return -ENODEV; | |
525 | #endif | |
6020c8f3 RR |
526 | if (pnpbios_disabled || dmi_check_system(pnpbios_dmi_table) || |
527 | paravirt_enabled()) { | |
1da177e4 LT |
528 | printk(KERN_INFO "PnPBIOS: Disabled\n"); |
529 | return -ENODEV; | |
530 | } | |
1da177e4 LT |
531 | #ifdef CONFIG_PNPACPI |
532 | if (!acpi_disabled && !pnpacpi_disabled) { | |
533 | pnpbios_disabled = 1; | |
534 | printk(KERN_INFO "PnPBIOS: Disabled by ACPI PNP\n"); | |
535 | return -ENODEV; | |
536 | } | |
07d4e9af | 537 | #endif /* CONFIG_ACPI */ |
1da177e4 LT |
538 | |
539 | /* scan the system for pnpbios support */ | |
540 | if (!pnpbios_probe_system()) | |
541 | return -ENODEV; | |
542 | ||
543 | /* make preparations for bios calls */ | |
544 | pnpbios_calls_init(pnp_bios_install); | |
545 | ||
546 | /* read the node info */ | |
547 | ret = pnp_bios_dev_node_info(&node_info); | |
548 | if (ret) { | |
9dd78466 BH |
549 | printk(KERN_ERR |
550 | "PnPBIOS: Unable to get node info. Aborting.\n"); | |
1da177e4 LT |
551 | return ret; |
552 | } | |
553 | ||
554 | /* register with the pnp layer */ | |
555 | ret = pnp_register_protocol(&pnpbios_protocol); | |
556 | if (ret) { | |
9dd78466 BH |
557 | printk(KERN_ERR |
558 | "PnPBIOS: Unable to register driver. Aborting.\n"); | |
1da177e4 LT |
559 | return ret; |
560 | } | |
561 | ||
562 | /* start the proc interface */ | |
563 | ret = pnpbios_proc_init(); | |
564 | if (ret) | |
565 | printk(KERN_ERR "PnPBIOS: Failed to create proc interface.\n"); | |
566 | ||
567 | /* scan for pnpbios devices */ | |
568 | build_devlist(); | |
569 | ||
8f81dd14 | 570 | pnp_platform_devices = 1; |
1da177e4 LT |
571 | return 0; |
572 | } | |
573 | ||
ed458df4 | 574 | fs_initcall(pnpbios_init); |
1da177e4 LT |
575 | |
576 | static int __init pnpbios_thread_init(void) | |
577 | { | |
db9c02fa | 578 | struct task_struct *task; |
1e0aa9ad | 579 | |
30cbc222 OH |
580 | #if defined(CONFIG_PPC_MERGE) |
581 | if (check_legacy_ioport(PNPBIOS_BASE)) | |
582 | return 0; | |
583 | #endif | |
1da177e4 LT |
584 | if (pnpbios_disabled) |
585 | return 0; | |
586 | #ifdef CONFIG_HOTPLUG | |
587 | init_completion(&unload_sem); | |
db9c02fa EB |
588 | task = kthread_run(pnp_dock_thread, NULL, "kpnpbiosd"); |
589 | if (!IS_ERR(task)) | |
1da177e4 LT |
590 | unloading = 0; |
591 | #endif | |
592 | return 0; | |
593 | } | |
594 | ||
1da177e4 LT |
595 | /* Start the kernel thread later: */ |
596 | module_init(pnpbios_thread_init); | |
597 | ||
1da177e4 | 598 | EXPORT_SYMBOL(pnpbios_protocol); |