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>
81 static union pnp_bios_install_struct
*pnp_bios_install
= NULL
;
83 int pnp_bios_present(void)
85 return (pnp_bios_install
!= NULL
);
88 struct pnp_dev_node_info node_info
;
98 static int unloading
= 0;
99 static struct completion unload_sem
;
102 * (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 (!(envp
= kcalloc(20, sizeof(char *), GFP_KERNEL
)))
111 if (!(buf
= kzalloc(256, GFP_KERNEL
))) {
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
120 argv
[0] = "/sbin/pnpbios";
124 /* minimal command environment */
125 envp
[i
++] = "HOME=/";
126 envp
[i
++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
129 /* hint that policy agent should enter no-stdout debug mode */
130 envp
[i
++] = "DEBUG=kernel";
132 /* extensible set of named bus-specific parameters,
133 * supporting multiple driver selection algorithms.
137 /* action: add, remove */
139 scratch
+= sprintf(scratch
, "ACTION=%s", dock
? "add" : "remove") + 1;
141 /* Report the ident for the dock */
143 scratch
+= sprintf(scratch
, "DOCK=%x/%x/%x",
144 info
->location_id
, info
->serial
, info
->capabilities
);
147 value
= call_usermodehelper(argv
[0], argv
, envp
, UMH_WAIT_EXEC
);
154 * Poll the PnP docking at regular intervals
156 static int pnp_dock_thread(void *unused
)
158 static struct pnp_docking_station_info now
;
159 int docked
= -1, d
= 0;
166 * Poll every 2 seconds
168 msleep_interruptible(2000);
173 status
= pnp_bios_dock_station_info(&now
);
179 case PNP_FUNCTION_NOT_SUPPORTED
:
180 complete_and_exit(&unload_sem
, 0);
181 case PNP_SYSTEM_NOT_DOCKED
:
188 pnpbios_print_status("pnp_dock_thread", status
);
192 if (pnp_dock_event(d
, &now
) == 0) {
196 "PnPBIOS: Docking station %stached\n",
197 docked
? "at" : "de");
202 complete_and_exit(&unload_sem
, 0);
205 #endif /* CONFIG_HOTPLUG */
207 static int pnpbios_get_resources(struct pnp_dev
*dev
)
209 u8 nodenum
= dev
->number
;
210 struct pnp_bios_node
*node
;
212 if (!pnpbios_is_dynamic(dev
))
215 dev_dbg(&dev
->dev
, "get resources\n");
216 node
= kzalloc(node_info
.max_node_size
, GFP_KERNEL
);
219 if (pnp_bios_get_dev_node(&nodenum
, (char)PNPMODE_DYNAMIC
, node
)) {
223 pnpbios_read_resources_from_node(dev
, node
);
224 dev
->active
= pnp_is_active(dev
);
229 static int pnpbios_set_resources(struct pnp_dev
*dev
)
231 u8 nodenum
= dev
->number
;
232 struct pnp_bios_node
*node
;
235 if (!pnpbios_is_dynamic(dev
))
238 dev_dbg(&dev
->dev
, "set resources\n");
239 node
= kzalloc(node_info
.max_node_size
, GFP_KERNEL
);
242 if (pnp_bios_get_dev_node(&nodenum
, (char)PNPMODE_DYNAMIC
, node
)) {
246 if (pnpbios_write_resources_to_node(dev
, node
) < 0) {
250 ret
= pnp_bios_set_dev_node(node
->handle
, (char)PNPMODE_DYNAMIC
, node
);
257 static void pnpbios_zero_data_stream(struct pnp_bios_node
*node
)
259 unsigned char *p
= (char *)node
->data
;
260 unsigned char *end
= (char *)(node
->data
+ node
->size
);
264 while ((char *)p
< (char *)end
) {
265 if (p
[0] & 0x80) { /* large tag */
266 len
= (p
[2] << 8) | p
[1];
269 if (((p
[0] >> 3) & 0x0f) == 0x0f)
274 for (i
= 0; i
< len
; i
++)
279 "PnPBIOS: Resource structure did not contain an end tag.\n");
282 static int pnpbios_disable_resources(struct pnp_dev
*dev
)
284 struct pnp_bios_node
*node
;
285 u8 nodenum
= dev
->number
;
288 if (dev
->flags
& PNPBIOS_NO_DISABLE
|| !pnpbios_is_dynamic(dev
))
291 node
= kzalloc(node_info
.max_node_size
, GFP_KERNEL
);
295 if (pnp_bios_get_dev_node(&nodenum
, (char)PNPMODE_DYNAMIC
, node
)) {
299 pnpbios_zero_data_stream(node
);
301 ret
= pnp_bios_set_dev_node(dev
->number
, (char)PNPMODE_DYNAMIC
, node
);
308 /* PnP Layer support */
310 struct pnp_protocol pnpbios_protocol
= {
311 .name
= "Plug and Play BIOS",
312 .get
= pnpbios_get_resources
,
313 .set
= pnpbios_set_resources
,
314 .disable
= pnpbios_disable_resources
,
317 static int __init
insert_device(struct pnp_bios_node
*node
)
319 struct list_head
*pos
;
323 /* check if the device is already added */
324 list_for_each(pos
, &pnpbios_protocol
.devices
) {
325 dev
= list_entry(pos
, struct pnp_dev
, protocol_list
);
326 if (dev
->number
== node
->handle
)
330 pnp_eisa_id_to_string(node
->eisa_id
& PNP_EISA_ID_MASK
, id
);
331 dev
= pnp_alloc_dev(&pnpbios_protocol
, node
->handle
, id
);
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
;
340 if (!(dev
->flags
& PNPBIOS_NO_DISABLE
) && pnpbios_is_dynamic(dev
))
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
;
348 /* clear out the damaged flags */
350 pnp_init_resources(dev
);
353 pnpbios_interface_attach_device(node
);
358 static void __init
build_devlist(void)
361 unsigned int nodes_got
= 0;
362 unsigned int devs
= 0;
363 struct pnp_bios_node
*node
;
365 node
= kzalloc(node_info
.max_node_size
, GFP_KERNEL
);
369 for (nodenum
= 0; nodenum
< 0xff;) {
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.
374 if (!pnpbios_dont_use_current_config
) {
375 if (pnp_bios_get_dev_node
376 (&nodenum
, (char)PNPMODE_DYNAMIC
, node
))
379 if (pnp_bios_get_dev_node
380 (&nodenum
, (char)PNPMODE_STATIC
, node
))
384 if (insert_device(node
) == 0)
386 if (nodenum
<= thisnodenum
) {
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
);
397 "PnPBIOS: %i node%s reported by PnP BIOS; %i recorded by driver\n",
398 nodes_got
, nodes_got
!= 1 ? "s" : "", devs
);
407 static int pnpbios_disabled
;
408 int pnpbios_dont_use_current_config
;
410 static int __init
pnpbios_setup(char *str
)
414 while ((str
!= NULL
) && (*str
!= '\0')) {
415 if (strncmp(str
, "off", 3) == 0)
416 pnpbios_disabled
= 1;
417 if (strncmp(str
, "on", 2) == 0)
418 pnpbios_disabled
= 0;
419 invert
= (strncmp(str
, "no-", 3) == 0);
422 if (strncmp(str
, "curr", 4) == 0)
423 pnpbios_dont_use_current_config
= invert
;
424 str
= strchr(str
, ',');
426 str
+= strspn(str
, ", \t");
432 __setup("pnpbios=", pnpbios_setup
);
434 /* PnP BIOS signature: "$PnP" */
435 #define PNP_SIGNATURE (('$' << 0) + ('P' << 8) + ('n' << 16) + ('P' << 24))
437 static int __init
pnpbios_probe_system(void)
439 union pnp_bios_install_struct
*check
;
443 printk(KERN_INFO
"PnPBIOS: Scanning system for PnP BIOS support...\n");
446 * Search the defined area (0xf0000-0xffff0) for a valid PnP BIOS
447 * structure and, if one is found, sets up the selectors and
450 for (check
= (union pnp_bios_install_struct
*)__va(0xf0000);
451 check
< (union pnp_bios_install_struct
*)__va(0xffff0);
452 check
= (void *)check
+ 16) {
453 if (check
->fields
.signature
!= PNP_SIGNATURE
)
456 "PnPBIOS: Found PnP BIOS installation structure at 0x%p\n",
458 length
= check
->fields
.length
;
461 "PnPBIOS: installation structure is invalid, skipping\n");
464 for (sum
= 0, i
= 0; i
< length
; i
++)
465 sum
+= check
->chars
[i
];
468 "PnPBIOS: installation structure is corrupted, skipping\n");
471 if (check
->fields
.version
< 0x10) {
473 "PnPBIOS: PnP BIOS version %d.%d is not supported\n",
474 check
->fields
.version
>> 4,
475 check
->fields
.version
& 15);
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,
481 check
->fields
.pm16cseg
, check
->fields
.pm16offset
,
482 check
->fields
.pm16dseg
);
483 pnp_bios_install
= check
;
487 printk(KERN_INFO
"PnPBIOS: PnP BIOS support was not detected.\n");
491 static int __init
exploding_pnp_bios(const struct dmi_system_id
*d
)
493 printk(KERN_WARNING
"%s detected. Disabling PnPBIOS\n", d
->ident
);
497 static struct dmi_system_id pnpbios_dmi_table
[] __initdata
= {
498 { /* PnPBIOS GPF on boot */
499 .callback
= exploding_pnp_bios
,
500 .ident
= "Higraded P14H",
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"),
508 { /* PnPBIOS GPF on boot */
509 .callback
= exploding_pnp_bios
,
510 .ident
= "ASUS P4P800",
512 DMI_MATCH(DMI_BOARD_VENDOR
, "ASUSTeK Computer Inc."),
513 DMI_MATCH(DMI_BOARD_NAME
, "P4P800"),
519 static int __init
pnpbios_init(void)
523 #if defined(CONFIG_PPC_MERGE)
524 if (check_legacy_ioport(PNPBIOS_BASE
))
527 if (pnpbios_disabled
|| dmi_check_system(pnpbios_dmi_table
) ||
528 paravirt_enabled()) {
529 printk(KERN_INFO
"PnPBIOS: Disabled\n");
532 #ifdef CONFIG_PNPACPI
533 if (!acpi_disabled
&& !pnpacpi_disabled
) {
534 pnpbios_disabled
= 1;
535 printk(KERN_INFO
"PnPBIOS: Disabled by ACPI PNP\n");
538 #endif /* CONFIG_ACPI */
540 /* scan the system for pnpbios support */
541 if (!pnpbios_probe_system())
544 /* make preparations for bios calls */
545 pnpbios_calls_init(pnp_bios_install
);
547 /* read the node info */
548 ret
= pnp_bios_dev_node_info(&node_info
);
551 "PnPBIOS: Unable to get node info. Aborting.\n");
555 /* register with the pnp layer */
556 ret
= pnp_register_protocol(&pnpbios_protocol
);
559 "PnPBIOS: Unable to register driver. Aborting.\n");
563 /* start the proc interface */
564 ret
= pnpbios_proc_init();
566 printk(KERN_ERR
"PnPBIOS: Failed to create proc interface.\n");
568 /* scan for pnpbios devices */
571 pnp_platform_devices
= 1;
575 subsys_initcall(pnpbios_init
);
577 static int __init
pnpbios_thread_init(void)
579 struct task_struct
*task
;
581 #if defined(CONFIG_PPC_MERGE)
582 if (check_legacy_ioport(PNPBIOS_BASE
))
585 if (pnpbios_disabled
)
587 #ifdef CONFIG_HOTPLUG
588 init_completion(&unload_sem
);
589 task
= kthread_run(pnp_dock_thread
, NULL
, "kpnpbiosd");
596 /* Start the kernel thread later: */
597 module_init(pnpbios_thread_init
);
599 EXPORT_SYMBOL(pnpbios_protocol
);