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 | */ | |
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/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> | |
64 | ||
65 | #include <asm/page.h> | |
66 | #include <asm/desc.h> | |
67 | #include <asm/system.h> | |
68 | #include <asm/byteorder.h> | |
69 | ||
70 | #include "pnpbios.h" | |
71 | ||
72 | ||
73 | /* | |
74 | * | |
75 | * PnP BIOS INTERFACE | |
76 | * | |
77 | */ | |
78 | ||
79 | static union pnp_bios_install_struct * pnp_bios_install = NULL; | |
80 | ||
81 | int pnp_bios_present(void) | |
82 | { | |
83 | return (pnp_bios_install != NULL); | |
84 | } | |
85 | ||
86 | struct pnp_dev_node_info node_info; | |
87 | ||
1da177e4 LT |
88 | /* |
89 | * | |
90 | * DOCKING FUNCTIONS | |
91 | * | |
92 | */ | |
93 | ||
94 | #ifdef CONFIG_HOTPLUG | |
95 | ||
96 | static int unloading = 0; | |
97 | static struct completion unload_sem; | |
98 | ||
99 | /* | |
100 | * (Much of this belongs in a shared routine somewhere) | |
101 | */ | |
102 | ||
103 | static 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 | ||
1da177e4 LT |
108 | if (!current->fs->root) { |
109 | return -EAGAIN; | |
110 | } | |
a2822e7f | 111 | if (!(envp = (char **) kcalloc (20, sizeof (char *), GFP_KERNEL))) { |
1da177e4 LT |
112 | return -ENOMEM; |
113 | } | |
a2822e7f | 114 | if (!(buf = kcalloc (1, 256, GFP_KERNEL))) { |
1da177e4 LT |
115 | kfree (envp); |
116 | return -ENOMEM; | |
117 | } | |
118 | ||
03438211 KS |
119 | /* FIXME: if there are actual users of this, it should be integrated into |
120 | * the driver core and use the usual infrastructure like sysfs and uevents */ | |
121 | argv [0] = "/sbin/pnpbios"; | |
1da177e4 LT |
122 | argv [1] = "dock"; |
123 | argv [2] = NULL; | |
124 | ||
125 | /* minimal command environment */ | |
126 | envp [i++] = "HOME=/"; | |
127 | envp [i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin"; | |
128 | ||
129 | #ifdef DEBUG | |
130 | /* hint that policy agent should enter no-stdout debug mode */ | |
131 | envp [i++] = "DEBUG=kernel"; | |
132 | #endif | |
133 | /* extensible set of named bus-specific parameters, | |
134 | * supporting multiple driver selection algorithms. | |
135 | */ | |
136 | scratch = buf; | |
137 | ||
138 | /* action: add, remove */ | |
139 | envp [i++] = scratch; | |
140 | scratch += sprintf (scratch, "ACTION=%s", dock?"add":"remove") + 1; | |
141 | ||
142 | /* Report the ident for the dock */ | |
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, 0); | |
149 | kfree (buf); | |
150 | kfree (envp); | |
151 | return 0; | |
152 | } | |
153 | ||
154 | /* | |
155 | * Poll the PnP docking at regular intervals | |
156 | */ | |
157 | static int pnp_dock_thread(void * unused) | |
158 | { | |
159 | static struct pnp_docking_station_info now; | |
160 | int docked = -1, d = 0; | |
161 | daemonize("kpnpbiosd"); | |
162 | allow_signal(SIGKILL); | |
163 | while(!unloading && !signal_pending(current)) | |
164 | { | |
165 | int status; | |
166 | ||
167 | /* | |
168 | * Poll every 2 seconds | |
169 | */ | |
170 | msleep_interruptible(2000); | |
171 | ||
172 | if(signal_pending(current)) { | |
3e1d1d28 | 173 | if (try_to_freeze()) |
1da177e4 LT |
174 | continue; |
175 | break; | |
176 | } | |
177 | ||
178 | status = pnp_bios_dock_station_info(&now); | |
179 | ||
180 | switch(status) | |
181 | { | |
182 | /* | |
183 | * No dock to manage | |
184 | */ | |
185 | case PNP_FUNCTION_NOT_SUPPORTED: | |
186 | complete_and_exit(&unload_sem, 0); | |
187 | case PNP_SYSTEM_NOT_DOCKED: | |
188 | d = 0; | |
189 | break; | |
190 | case PNP_SUCCESS: | |
191 | d = 1; | |
192 | break; | |
193 | default: | |
194 | pnpbios_print_status( "pnp_dock_thread", status ); | |
195 | continue; | |
196 | } | |
197 | if(d != docked) | |
198 | { | |
199 | if(pnp_dock_event(d, &now)==0) | |
200 | { | |
201 | docked = d; | |
202 | #if 0 | |
203 | printk(KERN_INFO "PnPBIOS: Docking station %stached\n", docked?"at":"de"); | |
204 | #endif | |
205 | } | |
206 | } | |
207 | } | |
208 | complete_and_exit(&unload_sem, 0); | |
209 | } | |
210 | ||
211 | #endif /* CONFIG_HOTPLUG */ | |
212 | ||
213 | static int pnpbios_get_resources(struct pnp_dev * dev, struct pnp_resource_table * res) | |
214 | { | |
215 | u8 nodenum = dev->number; | |
216 | struct pnp_bios_node * node; | |
217 | ||
218 | /* just in case */ | |
219 | if(!pnpbios_is_dynamic(dev)) | |
220 | return -EPERM; | |
221 | ||
a2822e7f | 222 | node = kcalloc(1, node_info.max_node_size, GFP_KERNEL); |
1da177e4 LT |
223 | if (!node) |
224 | return -1; | |
225 | if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_DYNAMIC, node)) { | |
226 | kfree(node); | |
227 | return -ENODEV; | |
228 | } | |
229 | pnpbios_read_resources_from_node(res, node); | |
230 | dev->active = pnp_is_active(dev); | |
231 | kfree(node); | |
232 | return 0; | |
233 | } | |
234 | ||
235 | static int pnpbios_set_resources(struct pnp_dev * dev, struct pnp_resource_table * res) | |
236 | { | |
237 | u8 nodenum = dev->number; | |
238 | struct pnp_bios_node * node; | |
239 | int ret; | |
240 | ||
241 | /* just in case */ | |
242 | if (!pnpbios_is_dynamic(dev)) | |
243 | return -EPERM; | |
244 | ||
a2822e7f | 245 | node = kcalloc(1, node_info.max_node_size, GFP_KERNEL); |
1da177e4 LT |
246 | if (!node) |
247 | return -1; | |
248 | if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_DYNAMIC, node)) { | |
249 | kfree(node); | |
250 | return -ENODEV; | |
251 | } | |
252 | if(pnpbios_write_resources_to_node(res, node)<0) { | |
253 | kfree(node); | |
254 | return -1; | |
255 | } | |
256 | ret = pnp_bios_set_dev_node(node->handle, (char)PNPMODE_DYNAMIC, node); | |
257 | kfree(node); | |
258 | if (ret > 0) | |
259 | ret = -1; | |
260 | return ret; | |
261 | } | |
262 | ||
263 | static void pnpbios_zero_data_stream(struct pnp_bios_node * node) | |
264 | { | |
265 | unsigned char * p = (char *)node->data; | |
266 | unsigned char * end = (char *)(node->data + node->size); | |
267 | unsigned int len; | |
268 | int i; | |
269 | while ((char *)p < (char *)end) { | |
270 | if(p[0] & 0x80) { /* large tag */ | |
271 | len = (p[2] << 8) | p[1]; | |
272 | p += 3; | |
273 | } else { | |
274 | if (((p[0]>>3) & 0x0f) == 0x0f) | |
275 | return; | |
276 | len = p[0] & 0x07; | |
277 | p += 1; | |
278 | } | |
279 | for (i = 0; i < len; i++) | |
280 | p[i] = 0; | |
281 | p += len; | |
282 | } | |
283 | printk(KERN_ERR "PnPBIOS: Resource structure did not contain an end tag.\n"); | |
284 | } | |
285 | ||
286 | static int pnpbios_disable_resources(struct pnp_dev *dev) | |
287 | { | |
288 | struct pnp_bios_node * node; | |
289 | u8 nodenum = dev->number; | |
290 | int ret; | |
291 | ||
292 | /* just in case */ | |
293 | if(dev->flags & PNPBIOS_NO_DISABLE || !pnpbios_is_dynamic(dev)) | |
294 | return -EPERM; | |
295 | ||
a2822e7f | 296 | node = kcalloc(1, node_info.max_node_size, GFP_KERNEL); |
1da177e4 LT |
297 | if (!node) |
298 | return -ENOMEM; | |
299 | ||
300 | if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_DYNAMIC, node)) { | |
301 | kfree(node); | |
302 | return -ENODEV; | |
303 | } | |
304 | pnpbios_zero_data_stream(node); | |
305 | ||
306 | ret = pnp_bios_set_dev_node(dev->number, (char)PNPMODE_DYNAMIC, node); | |
307 | kfree(node); | |
308 | if (ret > 0) | |
309 | ret = -1; | |
310 | return ret; | |
311 | } | |
312 | ||
313 | /* PnP Layer support */ | |
314 | ||
315 | struct pnp_protocol pnpbios_protocol = { | |
316 | .name = "Plug and Play BIOS", | |
317 | .get = pnpbios_get_resources, | |
318 | .set = pnpbios_set_resources, | |
319 | .disable = pnpbios_disable_resources, | |
320 | }; | |
321 | ||
322 | static int insert_device(struct pnp_dev *dev, struct pnp_bios_node * node) | |
323 | { | |
324 | struct list_head * pos; | |
325 | struct pnp_dev * pnp_dev; | |
326 | struct pnp_id *dev_id; | |
327 | char id[8]; | |
328 | ||
329 | /* check if the device is already added */ | |
330 | dev->number = node->handle; | |
331 | list_for_each (pos, &pnpbios_protocol.devices){ | |
332 | pnp_dev = list_entry(pos, struct pnp_dev, protocol_list); | |
333 | if (dev->number == pnp_dev->number) | |
334 | return -1; | |
335 | } | |
336 | ||
337 | /* set the initial values for the PnP device */ | |
a2822e7f | 338 | dev_id = kcalloc(1, sizeof(struct pnp_id), GFP_KERNEL); |
1da177e4 LT |
339 | if (!dev_id) |
340 | return -1; | |
341 | pnpid32_to_pnpid(node->eisa_id,id); | |
342 | memcpy(dev_id->id,id,7); | |
343 | pnp_add_id(dev_id, dev); | |
344 | pnpbios_parse_data_stream(dev, node); | |
345 | dev->active = pnp_is_active(dev); | |
346 | dev->flags = node->flags; | |
347 | if (!(dev->flags & PNPBIOS_NO_CONFIG)) | |
348 | dev->capabilities |= PNP_CONFIGURABLE; | |
349 | if (!(dev->flags & PNPBIOS_NO_DISABLE)) | |
350 | dev->capabilities |= PNP_DISABLE; | |
351 | dev->capabilities |= PNP_READ; | |
352 | if (pnpbios_is_dynamic(dev)) | |
353 | dev->capabilities |= PNP_WRITE; | |
354 | if (dev->flags & PNPBIOS_REMOVABLE) | |
355 | dev->capabilities |= PNP_REMOVABLE; | |
356 | dev->protocol = &pnpbios_protocol; | |
357 | ||
358 | /* clear out the damaged flags */ | |
359 | if (!dev->active) | |
360 | pnp_init_resource_table(&dev->res); | |
361 | ||
362 | pnp_add_device(dev); | |
363 | pnpbios_interface_attach_device(node); | |
364 | ||
365 | return 0; | |
366 | } | |
367 | ||
368 | static void __init build_devlist(void) | |
369 | { | |
370 | u8 nodenum; | |
371 | unsigned int nodes_got = 0; | |
372 | unsigned int devs = 0; | |
373 | struct pnp_bios_node *node; | |
374 | struct pnp_dev *dev; | |
375 | ||
a2822e7f | 376 | node = kcalloc(1, node_info.max_node_size, GFP_KERNEL); |
1da177e4 LT |
377 | if (!node) |
378 | return; | |
379 | ||
380 | for(nodenum=0; nodenum<0xff; ) { | |
381 | u8 thisnodenum = nodenum; | |
382 | /* eventually we will want to use PNPMODE_STATIC here but for now | |
383 | * dynamic will help us catch buggy bioses to add to the blacklist. | |
384 | */ | |
385 | if (!pnpbios_dont_use_current_config) { | |
386 | if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_DYNAMIC, node)) | |
387 | break; | |
388 | } else { | |
389 | if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_STATIC, node)) | |
390 | break; | |
391 | } | |
392 | nodes_got++; | |
a2822e7f | 393 | dev = kcalloc(1, sizeof (struct pnp_dev), GFP_KERNEL); |
1da177e4 LT |
394 | if (!dev) |
395 | break; | |
396 | if(insert_device(dev,node)<0) | |
397 | kfree(dev); | |
398 | else | |
399 | devs++; | |
400 | if (nodenum <= thisnodenum) { | |
401 | printk(KERN_ERR "PnPBIOS: build_devlist: Node number 0x%x is out of sequence following node 0x%x. Aborting.\n", (unsigned int)nodenum, (unsigned int)thisnodenum); | |
402 | break; | |
403 | } | |
404 | } | |
405 | kfree(node); | |
406 | ||
407 | printk(KERN_INFO "PnPBIOS: %i node%s reported by PnP BIOS; %i recorded by driver\n", | |
408 | nodes_got, nodes_got != 1 ? "s" : "", devs); | |
409 | } | |
410 | ||
411 | /* | |
412 | * | |
413 | * INIT AND EXIT | |
414 | * | |
415 | */ | |
416 | ||
417 | static int pnpbios_disabled; /* = 0 */ | |
418 | int pnpbios_dont_use_current_config; /* = 0 */ | |
419 | ||
420 | #ifndef MODULE | |
421 | static int __init pnpbios_setup(char *str) | |
422 | { | |
423 | int invert; | |
424 | ||
425 | while ((str != NULL) && (*str != '\0')) { | |
426 | if (strncmp(str, "off", 3) == 0) | |
427 | pnpbios_disabled=1; | |
428 | if (strncmp(str, "on", 2) == 0) | |
429 | pnpbios_disabled=0; | |
430 | invert = (strncmp(str, "no-", 3) == 0); | |
431 | if (invert) | |
432 | str += 3; | |
433 | if (strncmp(str, "curr", 4) == 0) | |
434 | pnpbios_dont_use_current_config = invert; | |
435 | str = strchr(str, ','); | |
436 | if (str != NULL) | |
437 | str += strspn(str, ", \t"); | |
438 | } | |
439 | ||
440 | return 1; | |
441 | } | |
442 | ||
443 | __setup("pnpbios=", pnpbios_setup); | |
444 | #endif | |
445 | ||
446 | /* PnP BIOS signature: "$PnP" */ | |
447 | #define PNP_SIGNATURE (('$' << 0) + ('P' << 8) + ('n' << 16) + ('P' << 24)) | |
448 | ||
449 | static 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 | * Search the defined area (0xf0000-0xffff0) for a valid PnP BIOS | |
459 | * structure and, if one is found, sets up the selectors and | |
460 | * entry points | |
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 "PnPBIOS: Found PnP BIOS installation structure at 0x%p\n", check); | |
468 | length = check->fields.length; | |
469 | if (!length) { | |
470 | printk(KERN_ERR "PnPBIOS: installation structure is invalid, skipping\n"); | |
471 | continue; | |
472 | } | |
473 | for (sum = 0, i = 0; i < length; i++) | |
474 | sum += check->chars[i]; | |
475 | if (sum) { | |
476 | printk(KERN_ERR "PnPBIOS: installation structure is corrupted, skipping\n"); | |
477 | continue; | |
478 | } | |
479 | if (check->fields.version < 0x10) { | |
480 | printk(KERN_WARNING "PnPBIOS: PnP BIOS version %d.%d is not supported\n", | |
481 | check->fields.version >> 4, | |
482 | check->fields.version & 15); | |
483 | continue; | |
484 | } | |
485 | printk(KERN_INFO "PnPBIOS: PnP BIOS version %d.%d, entry 0x%x:0x%x, dseg 0x%x\n", | |
486 | check->fields.version >> 4, check->fields.version & 15, | |
487 | check->fields.pm16cseg, check->fields.pm16offset, | |
488 | check->fields.pm16dseg); | |
489 | pnp_bios_install = check; | |
490 | return 1; | |
491 | } | |
492 | ||
493 | printk(KERN_INFO "PnPBIOS: PnP BIOS support was not detected.\n"); | |
494 | return 0; | |
495 | } | |
496 | ||
497 | static int __init exploding_pnp_bios(struct dmi_system_id *d) | |
498 | { | |
499 | printk(KERN_WARNING "%s detected. Disabling PnPBIOS\n", d->ident); | |
500 | return 0; | |
501 | } | |
502 | ||
ffbe5523 | 503 | static struct dmi_system_id pnpbios_dmi_table[] __initdata = { |
1da177e4 LT |
504 | { /* PnPBIOS GPF on boot */ |
505 | .callback = exploding_pnp_bios, | |
506 | .ident = "Higraded P14H", | |
507 | .matches = { | |
508 | DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."), | |
509 | DMI_MATCH(DMI_BIOS_VERSION, "07.00T"), | |
510 | DMI_MATCH(DMI_SYS_VENDOR, "Higraded"), | |
511 | DMI_MATCH(DMI_PRODUCT_NAME, "P14H"), | |
512 | }, | |
513 | }, | |
514 | { /* PnPBIOS GPF on boot */ | |
515 | .callback = exploding_pnp_bios, | |
516 | .ident = "ASUS P4P800", | |
517 | .matches = { | |
518 | DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer Inc."), | |
519 | DMI_MATCH(DMI_BOARD_NAME, "P4P800"), | |
520 | }, | |
521 | }, | |
522 | { } | |
523 | }; | |
524 | ||
525 | static int __init pnpbios_init(void) | |
526 | { | |
527 | int ret; | |
528 | ||
529 | if (pnpbios_disabled || dmi_check_system(pnpbios_dmi_table)) { | |
530 | printk(KERN_INFO "PnPBIOS: Disabled\n"); | |
531 | return -ENODEV; | |
532 | } | |
533 | ||
534 | #ifdef CONFIG_PNPACPI | |
535 | if (!acpi_disabled && !pnpacpi_disabled) { | |
536 | pnpbios_disabled = 1; | |
537 | printk(KERN_INFO "PnPBIOS: Disabled by ACPI PNP\n"); | |
538 | return -ENODEV; | |
539 | } | |
540 | #endif /* CONFIG_ACPI */ | |
541 | ||
542 | /* scan the system for pnpbios support */ | |
543 | if (!pnpbios_probe_system()) | |
544 | return -ENODEV; | |
545 | ||
546 | /* make preparations for bios calls */ | |
547 | pnpbios_calls_init(pnp_bios_install); | |
548 | ||
549 | /* read the node info */ | |
550 | ret = pnp_bios_dev_node_info(&node_info); | |
551 | if (ret) { | |
552 | printk(KERN_ERR "PnPBIOS: Unable to get node info. Aborting.\n"); | |
553 | return ret; | |
554 | } | |
555 | ||
556 | /* register with the pnp layer */ | |
557 | ret = pnp_register_protocol(&pnpbios_protocol); | |
558 | if (ret) { | |
559 | printk(KERN_ERR "PnPBIOS: Unable to register driver. Aborting.\n"); | |
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 | ||
571 | return 0; | |
572 | } | |
573 | ||
574 | subsys_initcall(pnpbios_init); | |
575 | ||
576 | static int __init pnpbios_thread_init(void) | |
577 | { | |
578 | if (pnpbios_disabled) | |
579 | return 0; | |
580 | #ifdef CONFIG_HOTPLUG | |
581 | init_completion(&unload_sem); | |
582 | if (kernel_thread(pnp_dock_thread, NULL, CLONE_KERNEL) > 0) | |
583 | unloading = 0; | |
584 | #endif | |
585 | return 0; | |
586 | } | |
587 | ||
588 | #ifndef MODULE | |
589 | ||
590 | /* init/main.c calls pnpbios_init early */ | |
591 | ||
592 | /* Start the kernel thread later: */ | |
593 | module_init(pnpbios_thread_init); | |
594 | ||
595 | #else | |
596 | ||
597 | /* | |
598 | * N.B.: Building pnpbios as a module hasn't been fully implemented | |
599 | */ | |
600 | ||
601 | MODULE_LICENSE("GPL"); | |
602 | ||
603 | static int __init pnpbios_init_all(void) | |
604 | { | |
605 | int r; | |
606 | ||
607 | r = pnpbios_init(); | |
608 | if (r) | |
609 | return r; | |
610 | r = pnpbios_thread_init(); | |
611 | if (r) | |
612 | return r; | |
613 | return 0; | |
614 | } | |
615 | ||
616 | static void __exit pnpbios_exit(void) | |
617 | { | |
618 | #ifdef CONFIG_HOTPLUG | |
619 | unloading = 1; | |
620 | wait_for_completion(&unload_sem); | |
621 | #endif | |
622 | pnpbios_proc_exit(); | |
623 | /* We ought to free resources here */ | |
624 | return; | |
625 | } | |
626 | ||
627 | module_init(pnpbios_init_all); | |
628 | module_exit(pnpbios_exit); | |
629 | ||
630 | #endif | |
631 | ||
632 | EXPORT_SYMBOL(pnpbios_protocol); |