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,
208 struct pnp_resource_table *res)
210 u8 nodenum = dev->number;
211 struct pnp_bios_node *node;
213 if (!pnpbios_is_dynamic(dev))
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(res, node);
224 dev->active = pnp_is_active(dev);
229 static int pnpbios_set_resources(struct pnp_dev *dev,
230 struct pnp_resource_table *res)
232 u8 nodenum = dev->number;
233 struct pnp_bios_node *node;
236 if (!pnpbios_is_dynamic(dev))
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(res, 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;
321 struct pnp_id *dev_id;
324 /* check if the device is already added */
325 list_for_each(pos, &pnpbios_protocol.devices) {
326 dev = list_entry(pos, struct pnp_dev, protocol_list);
327 if (dev->number == node->handle)
331 dev = kzalloc(sizeof(struct pnp_dev), GFP_KERNEL);
335 dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
341 dev->number = node->handle;
342 pnpid32_to_pnpid(node->eisa_id, id);
343 memcpy(dev_id->id, id, 7);
344 pnp_add_id(dev_id, dev);
345 pnpbios_parse_data_stream(dev, node);
346 dev->active = pnp_is_active(dev);
347 dev->flags = node->flags;
348 if (!(dev->flags & PNPBIOS_NO_CONFIG))
349 dev->capabilities |= PNP_CONFIGURABLE;
350 if (!(dev->flags & PNPBIOS_NO_DISABLE) && pnpbios_is_dynamic(dev))
351 dev->capabilities |= PNP_DISABLE;
352 dev->capabilities |= PNP_READ;
353 if (pnpbios_is_dynamic(dev))
354 dev->capabilities |= PNP_WRITE;
355 if (dev->flags & PNPBIOS_REMOVABLE)
356 dev->capabilities |= PNP_REMOVABLE;
357 dev->protocol = &pnpbios_protocol;
359 /* clear out the damaged flags */
361 pnp_init_resource_table(&dev->res);
364 pnpbios_interface_attach_device(node);
369 static void __init build_devlist(void)
372 unsigned int nodes_got = 0;
373 unsigned int devs = 0;
374 struct pnp_bios_node *node;
376 node = kzalloc(node_info.max_node_size, GFP_KERNEL);
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.
385 if (!pnpbios_dont_use_current_config) {
386 if (pnp_bios_get_dev_node
387 (&nodenum, (char)PNPMODE_DYNAMIC, node))
390 if (pnp_bios_get_dev_node
391 (&nodenum, (char)PNPMODE_STATIC, node))
395 if (insert_device(node) == 0)
397 if (nodenum <= thisnodenum) {
399 "PnPBIOS: build_devlist: Node number 0x%x is out of sequence following node 0x%x. Aborting.\n",
400 (unsigned int)nodenum,
401 (unsigned int)thisnodenum);
408 "PnPBIOS: %i node%s reported by PnP BIOS; %i recorded by driver\n",
409 nodes_got, nodes_got != 1 ? "s" : "", devs);
418 static int pnpbios_disabled;
419 int pnpbios_dont_use_current_config;
421 static int __init pnpbios_setup(char *str)
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);
433 if (strncmp(str, "curr", 4) == 0)
434 pnpbios_dont_use_current_config = invert;
435 str = strchr(str, ',');
437 str += strspn(str, ", \t");
443 __setup("pnpbios=", pnpbios_setup);
445 /* PnP BIOS signature: "$PnP" */
446 #define PNP_SIGNATURE (('$' << 0) + ('P' << 8) + ('n' << 16) + ('P' << 24))
448 static int __init pnpbios_probe_system(void)
450 union pnp_bios_install_struct *check;
454 printk(KERN_INFO "PnPBIOS: Scanning system for PnP BIOS support...\n");
457 * Search the defined area (0xf0000-0xffff0) for a valid PnP BIOS
458 * structure and, if one is found, sets up the selectors and
461 for (check = (union pnp_bios_install_struct *)__va(0xf0000);
462 check < (union pnp_bios_install_struct *)__va(0xffff0);
463 check = (void *)check + 16) {
464 if (check->fields.signature != PNP_SIGNATURE)
467 "PnPBIOS: Found PnP BIOS installation structure at 0x%p\n",
469 length = check->fields.length;
472 "PnPBIOS: installation structure is invalid, skipping\n");
475 for (sum = 0, i = 0; i < length; i++)
476 sum += check->chars[i];
479 "PnPBIOS: installation structure is corrupted, skipping\n");
482 if (check->fields.version < 0x10) {
484 "PnPBIOS: PnP BIOS version %d.%d is not supported\n",
485 check->fields.version >> 4,
486 check->fields.version & 15);
490 "PnPBIOS: PnP BIOS version %d.%d, entry 0x%x:0x%x, dseg 0x%x\n",
491 check->fields.version >> 4, check->fields.version & 15,
492 check->fields.pm16cseg, check->fields.pm16offset,
493 check->fields.pm16dseg);
494 pnp_bios_install = check;
498 printk(KERN_INFO "PnPBIOS: PnP BIOS support was not detected.\n");
502 static int __init exploding_pnp_bios(const struct dmi_system_id *d)
504 printk(KERN_WARNING "%s detected. Disabling PnPBIOS\n", d->ident);
508 static struct dmi_system_id pnpbios_dmi_table[] __initdata = {
509 { /* PnPBIOS GPF on boot */
510 .callback = exploding_pnp_bios,
511 .ident = "Higraded P14H",
513 DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
514 DMI_MATCH(DMI_BIOS_VERSION, "07.00T"),
515 DMI_MATCH(DMI_SYS_VENDOR, "Higraded"),
516 DMI_MATCH(DMI_PRODUCT_NAME, "P14H"),
519 { /* PnPBIOS GPF on boot */
520 .callback = exploding_pnp_bios,
521 .ident = "ASUS P4P800",
523 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer Inc."),
524 DMI_MATCH(DMI_BOARD_NAME, "P4P800"),
530 static int __init pnpbios_init(void)
534 #if defined(CONFIG_PPC_MERGE)
535 if (check_legacy_ioport(PNPBIOS_BASE))
538 if (pnpbios_disabled || dmi_check_system(pnpbios_dmi_table) ||
539 paravirt_enabled()) {
540 printk(KERN_INFO "PnPBIOS: Disabled\n");
543 #ifdef CONFIG_PNPACPI
544 if (!acpi_disabled && !pnpacpi_disabled) {
545 pnpbios_disabled = 1;
546 printk(KERN_INFO "PnPBIOS: Disabled by ACPI PNP\n");
549 #endif /* CONFIG_ACPI */
551 /* scan the system for pnpbios support */
552 if (!pnpbios_probe_system())
555 /* make preparations for bios calls */
556 pnpbios_calls_init(pnp_bios_install);
558 /* read the node info */
559 ret = pnp_bios_dev_node_info(&node_info);
562 "PnPBIOS: Unable to get node info. Aborting.\n");
566 /* register with the pnp layer */
567 ret = pnp_register_protocol(&pnpbios_protocol);
570 "PnPBIOS: Unable to register driver. Aborting.\n");
574 /* start the proc interface */
575 ret = pnpbios_proc_init();
577 printk(KERN_ERR "PnPBIOS: Failed to create proc interface.\n");
579 /* scan for pnpbios devices */
582 pnp_platform_devices = 1;
586 subsys_initcall(pnpbios_init);
588 static int __init pnpbios_thread_init(void)
590 struct task_struct *task;
592 #if defined(CONFIG_PPC_MERGE)
593 if (check_legacy_ioport(PNPBIOS_BASE))
596 if (pnpbios_disabled)
598 #ifdef CONFIG_HOTPLUG
599 init_completion(&unload_sem);
600 task = kthread_run(pnp_dock_thread, NULL, "kpnpbiosd");
607 /* Start the kernel thread later: */
608 module_init(pnpbios_thread_init);
610 EXPORT_SYMBOL(pnpbios_protocol);