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>
15 * Thomas Hood <jdthood@mail.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/kmod.h>
60 #include <linux/completion.h>
61 #include <linux/spinlock.h>
62 #include <linux/dmi.h>
66 #include <asm/system.h>
67 #include <asm/byteorder.h>
78 static union pnp_bios_install_struct * pnp_bios_install = NULL;
80 int pnp_bios_present(void)
82 return (pnp_bios_install != NULL);
85 struct pnp_dev_node_info node_info;
87 void *pnpbios_kmalloc(size_t size, int f)
89 void *p = kmalloc( size, f );
91 printk(KERN_ERR "PnPBIOS: kmalloc() failed\n");
103 #ifdef CONFIG_HOTPLUG
105 static int unloading = 0;
106 static struct completion unload_sem;
109 * (Much of this belongs in a shared routine somewhere)
112 static int pnp_dock_event(int dock, struct pnp_docking_station_info *info)
114 char *argv [3], **envp, *buf, *scratch;
117 if (!hotplug_path [0])
119 if (!current->fs->root) {
122 if (!(envp = (char **) pnpbios_kmalloc (20 * sizeof (char *), GFP_KERNEL))) {
125 if (!(buf = pnpbios_kmalloc (256, GFP_KERNEL))) {
130 /* only one standardized param to hotplug command: type */
131 argv [0] = hotplug_path;
135 /* minimal command environment */
136 envp [i++] = "HOME=/";
137 envp [i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
140 /* hint that policy agent should enter no-stdout debug mode */
141 envp [i++] = "DEBUG=kernel";
143 /* extensible set of named bus-specific parameters,
144 * supporting multiple driver selection algorithms.
148 /* action: add, remove */
149 envp [i++] = scratch;
150 scratch += sprintf (scratch, "ACTION=%s", dock?"add":"remove") + 1;
152 /* Report the ident for the dock */
153 envp [i++] = scratch;
154 scratch += sprintf (scratch, "DOCK=%x/%x/%x",
155 info->location_id, info->serial, info->capabilities);
158 value = call_usermodehelper (argv [0], argv, envp, 0);
165 * Poll the PnP docking at regular intervals
167 static int pnp_dock_thread(void * unused)
169 static struct pnp_docking_station_info now;
170 int docked = -1, d = 0;
171 daemonize("kpnpbiosd");
172 allow_signal(SIGKILL);
173 while(!unloading && !signal_pending(current))
178 * Poll every 2 seconds
180 set_current_state(TASK_INTERRUPTIBLE);
181 schedule_timeout(HZ*2);
182 if(signal_pending(current))
185 status = pnp_bios_dock_station_info(&now);
192 case PNP_FUNCTION_NOT_SUPPORTED:
193 complete_and_exit(&unload_sem, 0);
194 case PNP_SYSTEM_NOT_DOCKED:
201 pnpbios_print_status( "pnp_dock_thread", status );
206 if(pnp_dock_event(d, &now)==0)
210 printk(KERN_INFO "PnPBIOS: Docking station %stached\n", docked?"at":"de");
215 complete_and_exit(&unload_sem, 0);
218 #endif /* CONFIG_HOTPLUG */
220 static int pnpbios_get_resources(struct pnp_dev * dev, struct pnp_resource_table * res)
222 u8 nodenum = dev->number;
223 struct pnp_bios_node * node;
226 if(!pnpbios_is_dynamic(dev))
229 node = pnpbios_kmalloc(node_info.max_node_size, GFP_KERNEL);
232 if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_DYNAMIC, node)) {
236 pnpbios_read_resources_from_node(res, node);
237 dev->active = pnp_is_active(dev);
242 static int pnpbios_set_resources(struct pnp_dev * dev, struct pnp_resource_table * res)
244 u8 nodenum = dev->number;
245 struct pnp_bios_node * node;
249 if (!pnpbios_is_dynamic(dev))
252 node = pnpbios_kmalloc(node_info.max_node_size, GFP_KERNEL);
255 if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_DYNAMIC, node)) {
259 if(pnpbios_write_resources_to_node(res, node)<0) {
263 ret = pnp_bios_set_dev_node(node->handle, (char)PNPMODE_DYNAMIC, node);
270 static void pnpbios_zero_data_stream(struct pnp_bios_node * node)
272 unsigned char * p = (char *)node->data;
273 unsigned char * end = (char *)(node->data + node->size);
276 while ((char *)p < (char *)end) {
277 if(p[0] & 0x80) { /* large tag */
278 len = (p[2] << 8) | p[1];
281 if (((p[0]>>3) & 0x0f) == 0x0f)
286 for (i = 0; i < len; i++)
290 printk(KERN_ERR "PnPBIOS: Resource structure did not contain an end tag.\n");
293 static int pnpbios_disable_resources(struct pnp_dev *dev)
295 struct pnp_bios_node * node;
296 u8 nodenum = dev->number;
300 if(dev->flags & PNPBIOS_NO_DISABLE || !pnpbios_is_dynamic(dev))
303 node = pnpbios_kmalloc(node_info.max_node_size, GFP_KERNEL);
307 if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_DYNAMIC, node)) {
311 pnpbios_zero_data_stream(node);
313 ret = pnp_bios_set_dev_node(dev->number, (char)PNPMODE_DYNAMIC, node);
320 /* PnP Layer support */
322 struct pnp_protocol pnpbios_protocol = {
323 .name = "Plug and Play BIOS",
324 .get = pnpbios_get_resources,
325 .set = pnpbios_set_resources,
326 .disable = pnpbios_disable_resources,
329 static int insert_device(struct pnp_dev *dev, struct pnp_bios_node * node)
331 struct list_head * pos;
332 struct pnp_dev * pnp_dev;
333 struct pnp_id *dev_id;
336 /* check if the device is already added */
337 dev->number = node->handle;
338 list_for_each (pos, &pnpbios_protocol.devices){
339 pnp_dev = list_entry(pos, struct pnp_dev, protocol_list);
340 if (dev->number == pnp_dev->number)
344 /* set the initial values for the PnP device */
345 dev_id = pnpbios_kmalloc(sizeof(struct pnp_id), GFP_KERNEL);
348 pnpid32_to_pnpid(node->eisa_id,id);
349 memcpy(dev_id->id,id,7);
350 pnp_add_id(dev_id, dev);
351 pnpbios_parse_data_stream(dev, node);
352 dev->active = pnp_is_active(dev);
353 dev->flags = node->flags;
354 if (!(dev->flags & PNPBIOS_NO_CONFIG))
355 dev->capabilities |= PNP_CONFIGURABLE;
356 if (!(dev->flags & PNPBIOS_NO_DISABLE))
357 dev->capabilities |= PNP_DISABLE;
358 dev->capabilities |= PNP_READ;
359 if (pnpbios_is_dynamic(dev))
360 dev->capabilities |= PNP_WRITE;
361 if (dev->flags & PNPBIOS_REMOVABLE)
362 dev->capabilities |= PNP_REMOVABLE;
363 dev->protocol = &pnpbios_protocol;
365 /* clear out the damaged flags */
367 pnp_init_resource_table(&dev->res);
370 pnpbios_interface_attach_device(node);
375 static void __init build_devlist(void)
378 unsigned int nodes_got = 0;
379 unsigned int devs = 0;
380 struct pnp_bios_node *node;
383 node = pnpbios_kmalloc(node_info.max_node_size, GFP_KERNEL);
387 for(nodenum=0; nodenum<0xff; ) {
388 u8 thisnodenum = nodenum;
389 /* eventually we will want to use PNPMODE_STATIC here but for now
390 * dynamic will help us catch buggy bioses to add to the blacklist.
392 if (!pnpbios_dont_use_current_config) {
393 if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_DYNAMIC, node))
396 if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_STATIC, node))
400 dev = pnpbios_kmalloc(sizeof (struct pnp_dev), GFP_KERNEL);
403 if(insert_device(dev,node)<0)
407 if (nodenum <= thisnodenum) {
408 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);
414 printk(KERN_INFO "PnPBIOS: %i node%s reported by PnP BIOS; %i recorded by driver\n",
415 nodes_got, nodes_got != 1 ? "s" : "", devs);
424 static int pnpbios_disabled; /* = 0 */
425 int pnpbios_dont_use_current_config; /* = 0 */
428 static int __init pnpbios_setup(char *str)
432 while ((str != NULL) && (*str != '\0')) {
433 if (strncmp(str, "off", 3) == 0)
435 if (strncmp(str, "on", 2) == 0)
437 invert = (strncmp(str, "no-", 3) == 0);
440 if (strncmp(str, "curr", 4) == 0)
441 pnpbios_dont_use_current_config = invert;
442 str = strchr(str, ',');
444 str += strspn(str, ", \t");
450 __setup("pnpbios=", pnpbios_setup);
453 /* PnP BIOS signature: "$PnP" */
454 #define PNP_SIGNATURE (('$' << 0) + ('P' << 8) + ('n' << 16) + ('P' << 24))
456 int __init pnpbios_probe_system(void)
458 union pnp_bios_install_struct *check;
462 printk(KERN_INFO "PnPBIOS: Scanning system for PnP BIOS support...\n");
465 * Search the defined area (0xf0000-0xffff0) for a valid PnP BIOS
466 * structure and, if one is found, sets up the selectors and
469 for (check = (union pnp_bios_install_struct *) __va(0xf0000);
470 check < (union pnp_bios_install_struct *) __va(0xffff0);
471 check = (void *)check + 16) {
472 if (check->fields.signature != PNP_SIGNATURE)
474 printk(KERN_INFO "PnPBIOS: Found PnP BIOS installation structure at 0x%p\n", check);
475 length = check->fields.length;
477 printk(KERN_ERR "PnPBIOS: installation structure is invalid, skipping\n");
480 for (sum = 0, i = 0; i < length; i++)
481 sum += check->chars[i];
483 printk(KERN_ERR "PnPBIOS: installation structure is corrupted, skipping\n");
486 if (check->fields.version < 0x10) {
487 printk(KERN_WARNING "PnPBIOS: PnP BIOS version %d.%d is not supported\n",
488 check->fields.version >> 4,
489 check->fields.version & 15);
492 printk(KERN_INFO "PnPBIOS: PnP BIOS version %d.%d, entry 0x%x:0x%x, dseg 0x%x\n",
493 check->fields.version >> 4, check->fields.version & 15,
494 check->fields.pm16cseg, check->fields.pm16offset,
495 check->fields.pm16dseg);
496 pnp_bios_install = check;
500 printk(KERN_INFO "PnPBIOS: PnP BIOS support was not detected.\n");
504 static int __init exploding_pnp_bios(struct dmi_system_id *d)
506 printk(KERN_WARNING "%s detected. Disabling PnPBIOS\n", d->ident);
510 static struct dmi_system_id pnpbios_dmi_table[] = {
511 { /* PnPBIOS GPF on boot */
512 .callback = exploding_pnp_bios,
513 .ident = "Higraded P14H",
515 DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
516 DMI_MATCH(DMI_BIOS_VERSION, "07.00T"),
517 DMI_MATCH(DMI_SYS_VENDOR, "Higraded"),
518 DMI_MATCH(DMI_PRODUCT_NAME, "P14H"),
521 { /* PnPBIOS GPF on boot */
522 .callback = exploding_pnp_bios,
523 .ident = "ASUS P4P800",
525 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer Inc."),
526 DMI_MATCH(DMI_BOARD_NAME, "P4P800"),
532 int __init pnpbios_init(void)
536 if (pnpbios_disabled || dmi_check_system(pnpbios_dmi_table)) {
537 printk(KERN_INFO "PnPBIOS: Disabled\n");
541 if (!acpi_disabled) {
542 pnpbios_disabled = 1;
543 printk(KERN_INFO "PnPBIOS: Disabled by ACPI\n");
547 /* scan the system for pnpbios support */
548 if (!pnpbios_probe_system())
551 /* make preparations for bios calls */
552 pnpbios_calls_init(pnp_bios_install);
554 /* read the node info */
555 ret = pnp_bios_dev_node_info(&node_info);
557 printk(KERN_ERR "PnPBIOS: Unable to get node info. Aborting.\n");
561 /* register with the pnp layer */
562 ret = pnp_register_protocol(&pnpbios_protocol);
564 printk(KERN_ERR "PnPBIOS: Unable to register driver. Aborting.\n");
568 /* start the proc interface */
569 ret = pnpbios_proc_init();
571 printk(KERN_ERR "PnPBIOS: Failed to create proc interface.\n");
573 /* scan for pnpbios devices */
579 subsys_initcall(pnpbios_init);
581 static int __init pnpbios_thread_init(void)
583 #ifdef CONFIG_HOTPLUG
584 init_completion(&unload_sem);
585 if (kernel_thread(pnp_dock_thread, NULL, CLONE_KERNEL) > 0)
593 /* init/main.c calls pnpbios_init early */
595 /* Start the kernel thread later: */
596 module_init(pnpbios_thread_init);
601 * N.B.: Building pnpbios as a module hasn't been fully implemented
604 MODULE_LICENSE("GPL");
606 static int __init pnpbios_init_all(void)
613 r = pnpbios_thread_init();
619 static void __exit pnpbios_exit(void)
621 #ifdef CONFIG_HOTPLUG
623 wait_for_completion(&unload_sem);
626 /* We ought to free resources here */
630 module_init(pnpbios_init_all);
631 module_exit(pnpbios_exit);
635 EXPORT_SYMBOL(pnpbios_protocol);