2 * pnpbios -- PnP BIOS driver
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.
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>
16 * Brian Gerst <bgerst@didntduck.org>
18 * Ported to the PnP Layer and several additional improvements (C) 2002
19 * by Adam Belay <ambx1@neo.rr.com>
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
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.
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
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
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>
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>
69 #include <asm/system.h>
70 #include <asm/byteorder.h>
80 static union pnp_bios_install_struct
*pnp_bios_install
= NULL
;
82 int pnp_bios_present(void)
84 return (pnp_bios_install
!= NULL
);
87 struct pnp_dev_node_info node_info
;
97 static int unloading
= 0;
98 static struct completion unload_sem
;
101 * (Much of this belongs in a shared routine somewhere)
104 static int pnp_dock_event(int dock
, struct pnp_docking_station_info
*info
)
106 char *argv
[3], **envp
, *buf
, *scratch
;
109 if (!current
->fs
->root
) {
112 if (!(envp
= kcalloc(20, sizeof(char *), GFP_KERNEL
))) {
115 if (!(buf
= kzalloc(256, GFP_KERNEL
))) {
120 /* FIXME: if there are actual users of this, it should be integrated into
121 * the driver core and use the usual infrastructure like sysfs and uevents */
122 argv
[0] = "/sbin/pnpbios";
126 /* minimal command environment */
127 envp
[i
++] = "HOME=/";
128 envp
[i
++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
131 /* hint that policy agent should enter no-stdout debug mode */
132 envp
[i
++] = "DEBUG=kernel";
134 /* extensible set of named bus-specific parameters,
135 * supporting multiple driver selection algorithms.
139 /* action: add, remove */
141 scratch
+= sprintf(scratch
, "ACTION=%s", dock
? "add" : "remove") + 1;
143 /* Report the ident for the dock */
145 scratch
+= sprintf(scratch
, "DOCK=%x/%x/%x",
146 info
->location_id
, info
->serial
, info
->capabilities
);
149 value
= call_usermodehelper(argv
[0], argv
, envp
, UMH_WAIT_EXEC
);
156 * Poll the PnP docking at regular intervals
158 static int pnp_dock_thread(void *unused
)
160 static struct pnp_docking_station_info now
;
161 int docked
= -1, d
= 0;
167 * Poll every 2 seconds
169 msleep_interruptible(2000);
174 status
= pnp_bios_dock_station_info(&now
);
180 case PNP_FUNCTION_NOT_SUPPORTED
:
181 complete_and_exit(&unload_sem
, 0);
182 case PNP_SYSTEM_NOT_DOCKED
:
189 pnpbios_print_status("pnp_dock_thread", status
);
193 if (pnp_dock_event(d
, &now
) == 0) {
197 "PnPBIOS: Docking station %stached\n",
198 docked
? "at" : "de");
203 complete_and_exit(&unload_sem
, 0);
206 #endif /* CONFIG_HOTPLUG */
208 static int pnpbios_get_resources(struct pnp_dev
*dev
,
209 struct pnp_resource_table
*res
)
211 u8 nodenum
= dev
->number
;
212 struct pnp_bios_node
*node
;
215 if (!pnpbios_is_dynamic(dev
))
218 node
= kzalloc(node_info
.max_node_size
, GFP_KERNEL
);
221 if (pnp_bios_get_dev_node(&nodenum
, (char)PNPMODE_DYNAMIC
, node
)) {
225 pnpbios_read_resources_from_node(res
, node
);
226 dev
->active
= pnp_is_active(dev
);
231 static int pnpbios_set_resources(struct pnp_dev
*dev
,
232 struct pnp_resource_table
*res
)
234 u8 nodenum
= dev
->number
;
235 struct pnp_bios_node
*node
;
239 if (!pnpbios_is_dynamic(dev
))
242 node
= kzalloc(node_info
.max_node_size
, GFP_KERNEL
);
245 if (pnp_bios_get_dev_node(&nodenum
, (char)PNPMODE_DYNAMIC
, node
)) {
249 if (pnpbios_write_resources_to_node(res
, node
) < 0) {
253 ret
= pnp_bios_set_dev_node(node
->handle
, (char)PNPMODE_DYNAMIC
, node
);
260 static void pnpbios_zero_data_stream(struct pnp_bios_node
*node
)
262 unsigned char *p
= (char *)node
->data
;
263 unsigned char *end
= (char *)(node
->data
+ node
->size
);
266 while ((char *)p
< (char *)end
) {
267 if (p
[0] & 0x80) { /* large tag */
268 len
= (p
[2] << 8) | p
[1];
271 if (((p
[0] >> 3) & 0x0f) == 0x0f)
276 for (i
= 0; i
< len
; i
++)
281 "PnPBIOS: Resource structure did not contain an end tag.\n");
284 static int pnpbios_disable_resources(struct pnp_dev
*dev
)
286 struct pnp_bios_node
*node
;
287 u8 nodenum
= dev
->number
;
291 if (dev
->flags
& PNPBIOS_NO_DISABLE
|| !pnpbios_is_dynamic(dev
))
294 node
= kzalloc(node_info
.max_node_size
, GFP_KERNEL
);
298 if (pnp_bios_get_dev_node(&nodenum
, (char)PNPMODE_DYNAMIC
, node
)) {
302 pnpbios_zero_data_stream(node
);
304 ret
= pnp_bios_set_dev_node(dev
->number
, (char)PNPMODE_DYNAMIC
, node
);
311 /* PnP Layer support */
313 struct pnp_protocol pnpbios_protocol
= {
314 .name
= "Plug and Play BIOS",
315 .get
= pnpbios_get_resources
,
316 .set
= pnpbios_set_resources
,
317 .disable
= pnpbios_disable_resources
,
320 static int insert_device(struct pnp_dev
*dev
, struct pnp_bios_node
*node
)
322 struct list_head
*pos
;
323 struct pnp_dev
*pnp_dev
;
324 struct pnp_id
*dev_id
;
327 /* check if the device is already added */
328 dev
->number
= node
->handle
;
329 list_for_each(pos
, &pnpbios_protocol
.devices
) {
330 pnp_dev
= list_entry(pos
, struct pnp_dev
, protocol_list
);
331 if (dev
->number
== pnp_dev
->number
)
335 /* set the initial values for the PnP device */
336 dev_id
= kzalloc(sizeof(struct pnp_id
), GFP_KERNEL
);
339 pnpid32_to_pnpid(node
->eisa_id
, id
);
340 memcpy(dev_id
->id
, id
, 7);
341 pnp_add_id(dev_id
, dev
);
342 pnpbios_parse_data_stream(dev
, node
);
343 dev
->active
= pnp_is_active(dev
);
344 dev
->flags
= node
->flags
;
345 if (!(dev
->flags
& PNPBIOS_NO_CONFIG
))
346 dev
->capabilities
|= PNP_CONFIGURABLE
;
347 if (!(dev
->flags
& PNPBIOS_NO_DISABLE
) && pnpbios_is_dynamic(dev
))
348 dev
->capabilities
|= PNP_DISABLE
;
349 dev
->capabilities
|= PNP_READ
;
350 if (pnpbios_is_dynamic(dev
))
351 dev
->capabilities
|= PNP_WRITE
;
352 if (dev
->flags
& PNPBIOS_REMOVABLE
)
353 dev
->capabilities
|= PNP_REMOVABLE
;
354 dev
->protocol
= &pnpbios_protocol
;
356 /* clear out the damaged flags */
358 pnp_init_resource_table(&dev
->res
);
361 pnpbios_interface_attach_device(node
);
366 static void __init
build_devlist(void)
369 unsigned int nodes_got
= 0;
370 unsigned int devs
= 0;
371 struct pnp_bios_node
*node
;
374 node
= kzalloc(node_info
.max_node_size
, GFP_KERNEL
);
378 for (nodenum
= 0; nodenum
< 0xff;) {
379 u8 thisnodenum
= nodenum
;
380 /* eventually we will want to use PNPMODE_STATIC here but for now
381 * dynamic will help us catch buggy bioses to add to the blacklist.
383 if (!pnpbios_dont_use_current_config
) {
384 if (pnp_bios_get_dev_node
385 (&nodenum
, (char)PNPMODE_DYNAMIC
, node
))
388 if (pnp_bios_get_dev_node
389 (&nodenum
, (char)PNPMODE_STATIC
, node
))
393 dev
= kzalloc(sizeof(struct pnp_dev
), GFP_KERNEL
);
396 if (insert_device(dev
, node
) < 0)
400 if (nodenum
<= thisnodenum
) {
402 "PnPBIOS: build_devlist: Node number 0x%x is out of sequence following node 0x%x. Aborting.\n",
403 (unsigned int)nodenum
,
404 (unsigned int)thisnodenum
);
411 "PnPBIOS: %i node%s reported by PnP BIOS; %i recorded by driver\n",
412 nodes_got
, nodes_got
!= 1 ? "s" : "", devs
);
421 static int pnpbios_disabled
; /* = 0 */
422 int pnpbios_dont_use_current_config
; /* = 0 */
425 static int __init
pnpbios_setup(char *str
)
429 while ((str
!= NULL
) && (*str
!= '\0')) {
430 if (strncmp(str
, "off", 3) == 0)
431 pnpbios_disabled
= 1;
432 if (strncmp(str
, "on", 2) == 0)
433 pnpbios_disabled
= 0;
434 invert
= (strncmp(str
, "no-", 3) == 0);
437 if (strncmp(str
, "curr", 4) == 0)
438 pnpbios_dont_use_current_config
= invert
;
439 str
= strchr(str
, ',');
441 str
+= strspn(str
, ", \t");
447 __setup("pnpbios=", pnpbios_setup
);
450 /* PnP BIOS signature: "$PnP" */
451 #define PNP_SIGNATURE (('$' << 0) + ('P' << 8) + ('n' << 16) + ('P' << 24))
453 static int __init
pnpbios_probe_system(void)
455 union pnp_bios_install_struct
*check
;
459 printk(KERN_INFO
"PnPBIOS: Scanning system for PnP BIOS support...\n");
462 * Search the defined area (0xf0000-0xffff0) for a valid PnP BIOS
463 * structure and, if one is found, sets up the selectors and
466 for (check
= (union pnp_bios_install_struct
*)__va(0xf0000);
467 check
< (union pnp_bios_install_struct
*)__va(0xffff0);
468 check
= (void *)check
+ 16) {
469 if (check
->fields
.signature
!= PNP_SIGNATURE
)
472 "PnPBIOS: Found PnP BIOS installation structure at 0x%p\n",
474 length
= check
->fields
.length
;
477 "PnPBIOS: installation structure is invalid, skipping\n");
480 for (sum
= 0, i
= 0; i
< length
; i
++)
481 sum
+= check
->chars
[i
];
484 "PnPBIOS: installation structure is corrupted, skipping\n");
487 if (check
->fields
.version
< 0x10) {
489 "PnPBIOS: PnP BIOS version %d.%d is not supported\n",
490 check
->fields
.version
>> 4,
491 check
->fields
.version
& 15);
495 "PnPBIOS: PnP BIOS version %d.%d, entry 0x%x:0x%x, dseg 0x%x\n",
496 check
->fields
.version
>> 4, check
->fields
.version
& 15,
497 check
->fields
.pm16cseg
, check
->fields
.pm16offset
,
498 check
->fields
.pm16dseg
);
499 pnp_bios_install
= check
;
503 printk(KERN_INFO
"PnPBIOS: PnP BIOS support was not detected.\n");
507 static int __init
exploding_pnp_bios(struct dmi_system_id
*d
)
509 printk(KERN_WARNING
"%s detected. Disabling PnPBIOS\n", d
->ident
);
513 static struct dmi_system_id pnpbios_dmi_table
[] __initdata
= {
514 { /* PnPBIOS GPF on boot */
515 .callback
= exploding_pnp_bios
,
516 .ident
= "Higraded P14H",
518 DMI_MATCH(DMI_BIOS_VENDOR
, "American Megatrends Inc."),
519 DMI_MATCH(DMI_BIOS_VERSION
, "07.00T"),
520 DMI_MATCH(DMI_SYS_VENDOR
, "Higraded"),
521 DMI_MATCH(DMI_PRODUCT_NAME
, "P14H"),
524 { /* PnPBIOS GPF on boot */
525 .callback
= exploding_pnp_bios
,
526 .ident
= "ASUS P4P800",
528 DMI_MATCH(DMI_BOARD_VENDOR
, "ASUSTeK Computer Inc."),
529 DMI_MATCH(DMI_BOARD_NAME
, "P4P800"),
535 static int __init
pnpbios_init(void)
539 #if defined(CONFIG_PPC_MERGE)
540 if (check_legacy_ioport(PNPBIOS_BASE
))
543 if (pnpbios_disabled
|| dmi_check_system(pnpbios_dmi_table
) ||
544 paravirt_enabled()) {
545 printk(KERN_INFO
"PnPBIOS: Disabled\n");
548 #ifdef CONFIG_PNPACPI
549 if (!acpi_disabled
&& !pnpacpi_disabled
) {
550 pnpbios_disabled
= 1;
551 printk(KERN_INFO
"PnPBIOS: Disabled by ACPI PNP\n");
554 #endif /* CONFIG_ACPI */
556 /* scan the system for pnpbios support */
557 if (!pnpbios_probe_system())
560 /* make preparations for bios calls */
561 pnpbios_calls_init(pnp_bios_install
);
563 /* read the node info */
564 ret
= pnp_bios_dev_node_info(&node_info
);
567 "PnPBIOS: Unable to get node info. Aborting.\n");
571 /* register with the pnp layer */
572 ret
= pnp_register_protocol(&pnpbios_protocol
);
575 "PnPBIOS: Unable to register driver. Aborting.\n");
579 /* start the proc interface */
580 ret
= pnpbios_proc_init();
582 printk(KERN_ERR
"PnPBIOS: Failed to create proc interface.\n");
584 /* scan for pnpbios devices */
587 pnp_platform_devices
= 1;
591 subsys_initcall(pnpbios_init
);
593 static int __init
pnpbios_thread_init(void)
595 struct task_struct
*task
;
596 #if defined(CONFIG_PPC_MERGE)
597 if (check_legacy_ioport(PNPBIOS_BASE
))
600 if (pnpbios_disabled
)
602 #ifdef CONFIG_HOTPLUG
603 init_completion(&unload_sem
);
604 task
= kthread_run(pnp_dock_thread
, NULL
, "kpnpbiosd");
613 /* init/main.c calls pnpbios_init early */
615 /* Start the kernel thread later: */
616 module_init(pnpbios_thread_init
);
621 * N.B.: Building pnpbios as a module hasn't been fully implemented
624 MODULE_LICENSE("GPL");
626 static int __init
pnpbios_init_all(void)
633 r
= pnpbios_thread_init();
639 static void __exit
pnpbios_exit(void)
641 #ifdef CONFIG_HOTPLUG
643 wait_for_completion(&unload_sem
);
646 /* We ought to free resources here */
650 module_init(pnpbios_init_all
);
651 module_exit(pnpbios_exit
);
655 EXPORT_SYMBOL(pnpbios_protocol
);