[deliverable/linux.git] / drivers / pnp / pnpbios / core.c

/*
 * pnpbios -- PnP BIOS driver
 *
 * This driver provides access to Plug-'n'-Play services provided by
 * the PnP BIOS firmware, described in the following documents:
 *   Plug and Play BIOS Specification, Version 1.0A, 5 May 1994
 *   Plug and Play BIOS Clarification Paper, 6 October 1994
 *     Compaq Computer Corporation, Phoenix Technologies Ltd., Intel Corp.
 * 
 * Originally (C) 1998 Christian Schmidt <schmidt@digadd.de>
 * Modifications (C) 1998 Tom Lees <tom@lpsg.demon.co.uk>
 * Minor reorganizations by David Hinds <dahinds@users.sourceforge.net>
 * Further modifications (C) 2001, 2002 by:
 *   Alan Cox <alan@redhat.com>
 *   Thomas Hood
 *   Brian Gerst <bgerst@didntduck.org>
 *
 * Ported to the PnP Layer and several additional improvements (C) 2002
 * by Adam Belay <ambx1@neo.rr.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2, or (at your option) any
 * later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
 
/* Change Log
 *
 * Adam Belay - <ambx1@neo.rr.com> - March 16, 2003
 * rev 1.01	Only call pnp_bios_dev_node_info once
 *		Added pnpbios_print_status
 *		Added several new error messages and info messages
 *		Added pnpbios_interface_attach_device
 *		integrated core and proc init system
 *		Introduced PNPMODE flags
 *		Removed some useless includes
 */

#include <linux/types.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/linkage.h>
#include <linux/kernel.h>
#include <linux/pnpbios.h>
#include <linux/device.h>
#include <linux/pnp.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/slab.h>
#include <linux/kobject_uevent.h>
#include <linux/completion.h>
#include <linux/spinlock.h>
#include <linux/dmi.h>
#include <linux/delay.h>
#include <linux/acpi.h>

#include <asm/page.h>
#include <asm/desc.h>
#include <asm/system.h>
#include <asm/byteorder.h>

#include "pnpbios.h"


/*
 *
 * PnP BIOS INTERFACE
 *
 */

static union pnp_bios_install_struct * pnp_bios_install = NULL;

int pnp_bios_present(void)
{
	return (pnp_bios_install != NULL);
}

struct pnp_dev_node_info node_info;

/*
 *
 * DOCKING FUNCTIONS
 *
 */

#ifdef CONFIG_HOTPLUG

static int unloading = 0;
static struct completion unload_sem;

/*
 * (Much of this belongs in a shared routine somewhere)
 */
 
static int pnp_dock_event(int dock, struct pnp_docking_station_info *info)
{
	char *argv [3], **envp, *buf, *scratch;
	int i = 0, value;

	if (!hotplug_path [0])
		return -ENOENT;
	if (!current->fs->root) {
		return -EAGAIN;
	}
	if (!(envp = (char **) kcalloc (20, sizeof (char *), GFP_KERNEL))) {
		return -ENOMEM;
	}
	if (!(buf = kcalloc (1, 256, GFP_KERNEL))) {
		kfree (envp);
		return -ENOMEM;
	}

	/* only one standardized param to hotplug command: type */
	argv [0] = hotplug_path;
	argv [1] = "dock";
	argv [2] = NULL;

	/* minimal command environment */
	envp [i++] = "HOME=/";
	envp [i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";

#ifdef	DEBUG
	/* hint that policy agent should enter no-stdout debug mode */
	envp [i++] = "DEBUG=kernel";
#endif
	/* extensible set of named bus-specific parameters,
	 * supporting multiple driver selection algorithms.
	 */
	scratch = buf;

	/* action:  add, remove */
	envp [i++] = scratch;
	scratch += sprintf (scratch, "ACTION=%s", dock?"add":"remove") + 1;

	/* Report the ident for the dock */
	envp [i++] = scratch;
	scratch += sprintf (scratch, "DOCK=%x/%x/%x",
		info->location_id, info->serial, info->capabilities);
	envp[i] = NULL;
	
	value = call_usermodehelper (argv [0], argv, envp, 0);
	kfree (buf);
	kfree (envp);
	return 0;
}

/*
 * Poll the PnP docking at regular intervals
 */
static int pnp_dock_thread(void * unused)
{
	static struct pnp_docking_station_info now;
	int docked = -1, d = 0;
	daemonize("kpnpbiosd");
	allow_signal(SIGKILL);
	while(!unloading && !signal_pending(current))
	{
		int status;
		
		/*
		 * Poll every 2 seconds
		 */
		msleep_interruptible(2000);

		if(signal_pending(current)) {
			if (try_to_freeze())
				continue;
			break;
		}

		status = pnp_bios_dock_station_info(&now);

		switch(status)
		{
			/*
			 * No dock to manage
			 */
			case PNP_FUNCTION_NOT_SUPPORTED:
				complete_and_exit(&unload_sem, 0);
			case PNP_SYSTEM_NOT_DOCKED:
				d = 0;
				break;
			case PNP_SUCCESS:
				d = 1;
				break;
			default:
				pnpbios_print_status( "pnp_dock_thread", status );
				continue;
		}
		if(d != docked)
		{
			if(pnp_dock_event(d, &now)==0)
			{
				docked = d;
#if 0
				printk(KERN_INFO "PnPBIOS: Docking station %stached\n", docked?"at":"de");
#endif
			}
		}
	}
	complete_and_exit(&unload_sem, 0);
}

#endif   /* CONFIG_HOTPLUG */

static int pnpbios_get_resources(struct pnp_dev * dev, struct pnp_resource_table * res)
{
	u8 nodenum = dev->number;
	struct pnp_bios_node * node;

	/* just in case */
	if(!pnpbios_is_dynamic(dev))
		return -EPERM;

	node = kcalloc(1, node_info.max_node_size, GFP_KERNEL);
	if (!node)
		return -1;
	if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_DYNAMIC, node)) {
		kfree(node);
		return -ENODEV;
	}
	pnpbios_read_resources_from_node(res, node);
	dev->active = pnp_is_active(dev);
	kfree(node);
	return 0;
}

static int pnpbios_set_resources(struct pnp_dev * dev, struct pnp_resource_table * res)
{
	u8 nodenum = dev->number;
	struct pnp_bios_node * node;
	int ret;

	/* just in case */
	if (!pnpbios_is_dynamic(dev))
		return -EPERM;

	node = kcalloc(1, node_info.max_node_size, GFP_KERNEL);
	if (!node)
		return -1;
	if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_DYNAMIC, node)) {
		kfree(node);
		return -ENODEV;
	}
	if(pnpbios_write_resources_to_node(res, node)<0) {
		kfree(node);
		return -1;
	}
	ret = pnp_bios_set_dev_node(node->handle, (char)PNPMODE_DYNAMIC, node);
	kfree(node);
	if (ret > 0)
		ret = -1;
	return ret;
}

static void pnpbios_zero_data_stream(struct pnp_bios_node * node)
{
	unsigned char * p = (char *)node->data;
	unsigned char * end = (char *)(node->data + node->size);
	unsigned int len;
	int i;
	while ((char *)p < (char *)end) {
		if(p[0] & 0x80) { /* large tag */
			len = (p[2] << 8) | p[1];
			p += 3;
		} else {
			if (((p[0]>>3) & 0x0f) == 0x0f)
				return;
			len = p[0] & 0x07;
			p += 1;
		}
		for (i = 0; i < len; i++)
			p[i] = 0;
		p += len;
	}
	printk(KERN_ERR "PnPBIOS: Resource structure did not contain an end tag.\n");
}

static int pnpbios_disable_resources(struct pnp_dev *dev)
{
	struct pnp_bios_node * node;
	u8 nodenum = dev->number;
	int ret;

	/* just in case */
	if(dev->flags & PNPBIOS_NO_DISABLE || !pnpbios_is_dynamic(dev))
		return -EPERM;

	node = kcalloc(1, node_info.max_node_size, GFP_KERNEL);
	if (!node)
		return -ENOMEM;

	if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_DYNAMIC, node)) {
		kfree(node);
		return -ENODEV;
	}
	pnpbios_zero_data_stream(node);

	ret = pnp_bios_set_dev_node(dev->number, (char)PNPMODE_DYNAMIC, node);
	kfree(node);
	if (ret > 0)
		ret = -1;
	return ret;
}

/* PnP Layer support */

struct pnp_protocol pnpbios_protocol = {
	.name	= "Plug and Play BIOS",
	.get	= pnpbios_get_resources,
	.set	= pnpbios_set_resources,
	.disable = pnpbios_disable_resources,
};

static int insert_device(struct pnp_dev *dev, struct pnp_bios_node * node)
{
	struct list_head * pos;
	struct pnp_dev * pnp_dev;
	struct pnp_id *dev_id;
	char id[8];

	/* check if the device is already added */
	dev->number = node->handle;
	list_for_each (pos, &pnpbios_protocol.devices){
		pnp_dev = list_entry(pos, struct pnp_dev, protocol_list);
		if (dev->number == pnp_dev->number)
			return -1;
	}

	/* set the initial values for the PnP device */
	dev_id = kcalloc(1, sizeof(struct pnp_id), GFP_KERNEL);
	if (!dev_id)
		return -1;
	pnpid32_to_pnpid(node->eisa_id,id);
	memcpy(dev_id->id,id,7);
	pnp_add_id(dev_id, dev);
	pnpbios_parse_data_stream(dev, node);
	dev->active = pnp_is_active(dev);
	dev->flags = node->flags;
	if (!(dev->flags & PNPBIOS_NO_CONFIG))
		dev->capabilities |= PNP_CONFIGURABLE;
	if (!(dev->flags & PNPBIOS_NO_DISABLE))
		dev->capabilities |= PNP_DISABLE;
	dev->capabilities |= PNP_READ;
	if (pnpbios_is_dynamic(dev))
		dev->capabilities |= PNP_WRITE;
	if (dev->flags & PNPBIOS_REMOVABLE)
		dev->capabilities |= PNP_REMOVABLE;
	dev->protocol = &pnpbios_protocol;

	/* clear out the damaged flags */
	if (!dev->active)
		pnp_init_resource_table(&dev->res);

	pnp_add_device(dev);
	pnpbios_interface_attach_device(node);

	return 0;
}

static void __init build_devlist(void)
{
	u8 nodenum;
	unsigned int nodes_got = 0;
	unsigned int devs = 0;
	struct pnp_bios_node *node;
	struct pnp_dev *dev;

	node = kcalloc(1, node_info.max_node_size, GFP_KERNEL);
	if (!node)
		return;

	for(nodenum=0; nodenum<0xff; ) {
		u8 thisnodenum = nodenum;
		/* eventually we will want to use PNPMODE_STATIC here but for now
		 * dynamic will help us catch buggy bioses to add to the blacklist.
		 */
		if (!pnpbios_dont_use_current_config) {
			if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_DYNAMIC, node))
				break;
		} else {
			if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_STATIC, node))
				break;
		}
		nodes_got++;
		dev =  kcalloc(1, sizeof (struct pnp_dev), GFP_KERNEL);
		if (!dev)
			break;
		if(insert_device(dev,node)<0)
			kfree(dev);
		else
			devs++;
		if (nodenum <= thisnodenum) {
			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);
			break;
		}
	}
	kfree(node);

	printk(KERN_INFO "PnPBIOS: %i node%s reported by PnP BIOS; %i recorded by driver\n",
		nodes_got, nodes_got != 1 ? "s" : "", devs);
}

/*
 *
 * INIT AND EXIT
 *
 */

static int pnpbios_disabled; /* = 0 */
int pnpbios_dont_use_current_config; /* = 0 */

#ifndef MODULE
static int __init pnpbios_setup(char *str)
{
	int invert;

	while ((str != NULL) && (*str != '\0')) {
		if (strncmp(str, "off", 3) == 0)
			pnpbios_disabled=1;
		if (strncmp(str, "on", 2) == 0)
			pnpbios_disabled=0;
		invert = (strncmp(str, "no-", 3) == 0);
		if (invert)
			str += 3;
		if (strncmp(str, "curr", 4) == 0)
			pnpbios_dont_use_current_config = invert;
		str = strchr(str, ',');
		if (str != NULL)
			str += strspn(str, ", \t");
	}

	return 1;
}

__setup("pnpbios=", pnpbios_setup);
#endif

/* PnP BIOS signature: "$PnP" */
#define PNP_SIGNATURE   (('$' << 0) + ('P' << 8) + ('n' << 16) + ('P' << 24))

static int __init pnpbios_probe_system(void)
{
	union pnp_bios_install_struct *check;
	u8 sum;
	int length, i;

	printk(KERN_INFO "PnPBIOS: Scanning system for PnP BIOS support...\n");

	/*
 	 * Search the defined area (0xf0000-0xffff0) for a valid PnP BIOS
	 * structure and, if one is found, sets up the selectors and
	 * entry points
	 */
	for (check = (union pnp_bios_install_struct *) __va(0xf0000);
	     check < (union pnp_bios_install_struct *) __va(0xffff0);
	     check = (void *)check + 16) {
		if (check->fields.signature != PNP_SIGNATURE)
			continue;
		printk(KERN_INFO "PnPBIOS: Found PnP BIOS installation structure at 0x%p\n", check);
		length = check->fields.length;
		if (!length) {
			printk(KERN_ERR "PnPBIOS: installation structure is invalid, skipping\n");
			continue;
		}
		for (sum = 0, i = 0; i < length; i++)
			sum += check->chars[i];
		if (sum) {
			printk(KERN_ERR "PnPBIOS: installation structure is corrupted, skipping\n");
			continue;
		}
		if (check->fields.version < 0x10) {
			printk(KERN_WARNING "PnPBIOS: PnP BIOS version %d.%d is not supported\n",
			       check->fields.version >> 4,
			       check->fields.version & 15);
			continue;
		}
		printk(KERN_INFO "PnPBIOS: PnP BIOS version %d.%d, entry 0x%x:0x%x, dseg 0x%x\n",
                       check->fields.version >> 4, check->fields.version & 15,
		       check->fields.pm16cseg, check->fields.pm16offset,
		       check->fields.pm16dseg);
		pnp_bios_install = check;
		return 1;
	}

	printk(KERN_INFO "PnPBIOS: PnP BIOS support was not detected.\n");
	return 0;
}

static int __init exploding_pnp_bios(struct dmi_system_id *d)
{
	printk(KERN_WARNING "%s detected. Disabling PnPBIOS\n", d->ident);
	return 0;
}

static struct dmi_system_id pnpbios_dmi_table[] __initdata = {
	{	/* PnPBIOS GPF on boot */
		.callback = exploding_pnp_bios,
		.ident = "Higraded P14H",
		.matches = {
			DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
			DMI_MATCH(DMI_BIOS_VERSION, "07.00T"),
			DMI_MATCH(DMI_SYS_VENDOR, "Higraded"),
			DMI_MATCH(DMI_PRODUCT_NAME, "P14H"),
		},
	},
	{	/* PnPBIOS GPF on boot */
		.callback = exploding_pnp_bios,
		.ident = "ASUS P4P800",
		.matches = {
			DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer Inc."),
			DMI_MATCH(DMI_BOARD_NAME, "P4P800"),
		},
	},
	{ }
};

static int __init pnpbios_init(void)
{
	int ret;

	if (pnpbios_disabled || dmi_check_system(pnpbios_dmi_table)) {
		printk(KERN_INFO "PnPBIOS: Disabled\n");
		return -ENODEV;
	}

#ifdef CONFIG_PNPACPI
	if (!acpi_disabled && !pnpacpi_disabled) {
		pnpbios_disabled = 1;
		printk(KERN_INFO "PnPBIOS: Disabled by ACPI PNP\n");
		return -ENODEV;
	}
#endif /* CONFIG_ACPI */

	/* scan the system for pnpbios support */
	if (!pnpbios_probe_system())
		return -ENODEV;

	/* make preparations for bios calls */
	pnpbios_calls_init(pnp_bios_install);

	/* read the node info */
	ret = pnp_bios_dev_node_info(&node_info);
	if (ret) {
		printk(KERN_ERR "PnPBIOS: Unable to get node info.  Aborting.\n");
		return ret;
	}

	/* register with the pnp layer */
	ret = pnp_register_protocol(&pnpbios_protocol);
	if (ret) {
		printk(KERN_ERR "PnPBIOS: Unable to register driver.  Aborting.\n");
		return ret;
	}

	/* start the proc interface */
	ret = pnpbios_proc_init();
	if (ret)
		printk(KERN_ERR "PnPBIOS: Failed to create proc interface.\n");

	/* scan for pnpbios devices */
	build_devlist();

	return 0;
}

subsys_initcall(pnpbios_init);

static int __init pnpbios_thread_init(void)
{
	if (pnpbios_disabled)
		return 0;
#ifdef CONFIG_HOTPLUG
	init_completion(&unload_sem);
	if (kernel_thread(pnp_dock_thread, NULL, CLONE_KERNEL) > 0)
		unloading = 0;
#endif
	return 0;
}

#ifndef MODULE

/* init/main.c calls pnpbios_init early */

/* Start the kernel thread later: */
module_init(pnpbios_thread_init);

#else

/*
 * N.B.: Building pnpbios as a module hasn't been fully implemented
 */

MODULE_LICENSE("GPL");

static int __init pnpbios_init_all(void)
{
	int r;

	r = pnpbios_init();
	if (r)
		return r;
	r = pnpbios_thread_init();
	if (r)
		return r;
	return 0;
}

static void __exit pnpbios_exit(void)
{
#ifdef CONFIG_HOTPLUG
	unloading = 1;
	wait_for_completion(&unload_sem);
#endif
	pnpbios_proc_exit();
	/* We ought to free resources here */
	return;
}

module_init(pnpbios_init_all);
module_exit(pnpbios_exit);

#endif

EXPORT_SYMBOL(pnpbios_protocol);
Commit	Line	Data
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>
	59	#include <linux/kobject_uevent.h>
	60	#include <linux/completion.h>
	61	#include <linux/spinlock.h>
	62	#include <linux/dmi.h>
	63	#include <linux/delay.h>
	64	#include <linux/acpi.h>
65
66	#include <asm/page.h>
67	#include <asm/desc.h>
68	#include <asm/system.h>
69	#include <asm/byteorder.h>
70
71	#include "pnpbios.h"
72
73
74	/*
75	*
76	* PnP BIOS INTERFACE
77	*
78	*/
79
80	static union pnp_bios_install_struct * pnp_bios_install = NULL;
81
82	int pnp_bios_present(void)
83	{
84	return (pnp_bios_install != NULL);
85	}
86
87	struct pnp_dev_node_info node_info;
88
1da177e4 LT	89	/*
	90	*
	91	* DOCKING FUNCTIONS
	92	*
	93	*/
	94
	95	#ifdef CONFIG_HOTPLUG
	96
	97	static int unloading = 0;
	98	static struct completion unload_sem;
	99
	100	/*
	101	* (Much of this belongs in a shared routine somewhere)
	102	*/
	103
	104	static int pnp_dock_event(int dock, struct pnp_docking_station_info *info)
	105	{
	106	char argv [3], envp, buf, *scratch;
	107	int i = 0, value;
	108
	109	if (!hotplug_path [0])
	110	return -ENOENT;
	111	if (!current->fs->root) {
	112	return -EAGAIN;
	113	}
a2822e7f	114	if (!(envp = (char *) kcalloc (20, sizeof (char ), GFP_KERNEL))) {
1da177e4 LT	115	return -ENOMEM;
1da177e4 LT	116	}
a2822e7f	117	if (!(buf = kcalloc (1, 256, GFP_KERNEL))) {
1da177e4 LT	118	kfree (envp);
	119	return -ENOMEM;
	120	}
	121
	122	/* only one standardized param to hotplug command: type */
	123	argv [0] = hotplug_path;
	124	argv [1] = "dock";
	125	argv [2] = NULL;
	126
	127	/* minimal command environment */
	128	envp [i++] = "HOME=/";
	129	envp [i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
	130
	131	#ifdef DEBUG
	132	/* hint that policy agent should enter no-stdout debug mode */
	133	envp [i++] = "DEBUG=kernel";
	134	#endif
	135	/* extensible set of named bus-specific parameters,
	136	* supporting multiple driver selection algorithms.
	137	*/
	138	scratch = buf;
	139
	140	/* action: add, remove */
	141	envp [i++] = scratch;
	142	scratch += sprintf (scratch, "ACTION=%s", dock?"add":"remove") + 1;
	143
	144	/* Report the ident for the dock */
	145	envp [i++] = scratch;
	146	scratch += sprintf (scratch, "DOCK=%x/%x/%x",
	147	info->location_id, info->serial, info->capabilities);
	148	envp[i] = NULL;
	149
	150	value = call_usermodehelper (argv [0], argv, envp, 0);
	151	kfree (buf);
	152	kfree (envp);
	153	return 0;
	154	}
	155
	156	/*
	157	* Poll the PnP docking at regular intervals
	158	*/
	159	static int pnp_dock_thread(void * unused)
	160	{
	161	static struct pnp_docking_station_info now;
	162	int docked = -1, d = 0;
	163	daemonize("kpnpbiosd");
	164	allow_signal(SIGKILL);
	165	while(!unloading && !signal_pending(current))
	166	{
	167	int status;
	168
	169	/*
	170	* Poll every 2 seconds
	171	*/
	172	msleep_interruptible(2000);
	173
	174	if(signal_pending(current)) {
3e1d1d28	175	if (try_to_freeze())
1da177e4 LT	176	continue;
	177	break;
	178	}
	179
	180	status = pnp_bios_dock_station_info(&now);
	181
	182	switch(status)
	183	{
	184	/*
	185	* No dock to manage
	186	*/
	187	case PNP_FUNCTION_NOT_SUPPORTED:
	188	complete_and_exit(&unload_sem, 0);
	189	case PNP_SYSTEM_NOT_DOCKED:
	190	d = 0;
	191	break;
	192	case PNP_SUCCESS:
	193	d = 1;
	194	break;
	195	default:
	196	pnpbios_print_status( "pnp_dock_thread", status );
	197	continue;
	198	}
	199	if(d != docked)
	200	{
	201	if(pnp_dock_event(d, &now)==0)
	202	{
	203	docked = d;
	204	#if 0
	205	printk(KERN_INFO "PnPBIOS: Docking station %stached\n", docked?"at":"de");
	206	#endif
	207	}
	208	}
	209	}
	210	complete_and_exit(&unload_sem, 0);
	211	}
	212
	213	#endif /* CONFIG_HOTPLUG */
	214
	215	static int pnpbios_get_resources(struct pnp_dev * dev, struct pnp_resource_table * res)
	216	{
	217	u8 nodenum = dev->number;
	218	struct pnp_bios_node * node;
	219
	220	/* just in case */
	221	if(!pnpbios_is_dynamic(dev))
	222	return -EPERM;
	223
a2822e7f	224	node = kcalloc(1, node_info.max_node_size, GFP_KERNEL);
1da177e4 LT	225	if (!node)
	226	return -1;
	227	if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_DYNAMIC, node)) {
	228	kfree(node);
	229	return -ENODEV;
	230	}
	231	pnpbios_read_resources_from_node(res, node);
	232	dev->active = pnp_is_active(dev);
	233	kfree(node);
	234	return 0;
	235	}
	236
	237	static int pnpbios_set_resources(struct pnp_dev * dev, struct pnp_resource_table * res)
	238	{
	239	u8 nodenum = dev->number;
	240	struct pnp_bios_node * node;
	241	int ret;
	242
	243	/* just in case */
	244	if (!pnpbios_is_dynamic(dev))
	245	return -EPERM;
	246
a2822e7f	247	node = kcalloc(1, node_info.max_node_size, GFP_KERNEL);
1da177e4 LT	248	if (!node)
	249	return -1;
	250	if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_DYNAMIC, node)) {
	251	kfree(node);
	252	return -ENODEV;
	253	}
	254	if(pnpbios_write_resources_to_node(res, node)<0) {
	255	kfree(node);
	256	return -1;
	257	}
	258	ret = pnp_bios_set_dev_node(node->handle, (char)PNPMODE_DYNAMIC, node);
	259	kfree(node);
	260	if (ret > 0)
	261	ret = -1;
	262	return ret;
	263	}
	264
	265	static void pnpbios_zero_data_stream(struct pnp_bios_node * node)
	266	{
	267	unsigned char * p = (char *)node->data;
	268	unsigned char * end = (char *)(node->data + node->size);
	269	unsigned int len;
	270	int i;
	271	while ((char )p < (char )end) {
	272	if(p[0] & 0x80) { /* large tag */
	273	len = (p[2] << 8) \| p[1];
	274	p += 3;
	275	} else {
	276	if (((p[0]>>3) & 0x0f) == 0x0f)
	277	return;
	278	len = p[0] & 0x07;
	279	p += 1;
	280	}
	281	for (i = 0; i < len; i++)
	282	p[i] = 0;
	283	p += len;
	284	}
	285	printk(KERN_ERR "PnPBIOS: Resource structure did not contain an end tag.\n");
	286	}
	287
	288	static int pnpbios_disable_resources(struct pnp_dev *dev)
	289	{
	290	struct pnp_bios_node * node;
	291	u8 nodenum = dev->number;
	292	int ret;
	293
	294	/* just in case */
	295	if(dev->flags & PNPBIOS_NO_DISABLE \|\| !pnpbios_is_dynamic(dev))
	296	return -EPERM;
	297
a2822e7f	298	node = kcalloc(1, node_info.max_node_size, GFP_KERNEL);
1da177e4 LT	299	if (!node)
	300	return -ENOMEM;
	301
	302	if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_DYNAMIC, node)) {
	303	kfree(node);
	304	return -ENODEV;
	305	}
	306	pnpbios_zero_data_stream(node);
	307
	308	ret = pnp_bios_set_dev_node(dev->number, (char)PNPMODE_DYNAMIC, node);
	309	kfree(node);
	310	if (ret > 0)
	311	ret = -1;
	312	return ret;
	313	}
	314
	315	/* PnP Layer support */
	316
	317	struct pnp_protocol pnpbios_protocol = {
	318	.name = "Plug and Play BIOS",
	319	.get = pnpbios_get_resources,
	320	.set = pnpbios_set_resources,
	321	.disable = pnpbios_disable_resources,
	322	};
	323
	324	static int insert_device(struct pnp_dev dev, struct pnp_bios_node node)
	325	{
	326	struct list_head * pos;
	327	struct pnp_dev * pnp_dev;
	328	struct pnp_id *dev_id;
	329	char id[8];
	330
	331	/* check if the device is already added */
	332	dev->number = node->handle;
	333	list_for_each (pos, &pnpbios_protocol.devices){
	334	pnp_dev = list_entry(pos, struct pnp_dev, protocol_list);
	335	if (dev->number == pnp_dev->number)
	336	return -1;
	337	}
	338
	339	/* set the initial values for the PnP device */
a2822e7f	340	dev_id = kcalloc(1, sizeof(struct pnp_id), GFP_KERNEL);
1da177e4 LT	341	if (!dev_id)
	342	return -1;
	343	pnpid32_to_pnpid(node->eisa_id,id);
	344	memcpy(dev_id->id,id,7);
	345	pnp_add_id(dev_id, dev);
	346	pnpbios_parse_data_stream(dev, node);
	347	dev->active = pnp_is_active(dev);
	348	dev->flags = node->flags;
	349	if (!(dev->flags & PNPBIOS_NO_CONFIG))
	350	dev->capabilities \|= PNP_CONFIGURABLE;
	351	if (!(dev->flags & PNPBIOS_NO_DISABLE))
	352	dev->capabilities \|= PNP_DISABLE;
	353	dev->capabilities \|= PNP_READ;
	354	if (pnpbios_is_dynamic(dev))
	355	dev->capabilities \|= PNP_WRITE;
	356	if (dev->flags & PNPBIOS_REMOVABLE)
	357	dev->capabilities \|= PNP_REMOVABLE;
	358	dev->protocol = &pnpbios_protocol;
	359
	360	/* clear out the damaged flags */
	361	if (!dev->active)
	362	pnp_init_resource_table(&dev->res);
	363
	364	pnp_add_device(dev);
	365	pnpbios_interface_attach_device(node);
	366
	367	return 0;
	368	}
	369
	370	static void __init build_devlist(void)
	371	{
	372	u8 nodenum;
	373	unsigned int nodes_got = 0;
	374	unsigned int devs = 0;
	375	struct pnp_bios_node *node;
	376	struct pnp_dev *dev;
	377
a2822e7f	378	node = kcalloc(1, node_info.max_node_size, GFP_KERNEL);
1da177e4 LT	379	if (!node)
	380	return;
	381
	382	for(nodenum=0; nodenum<0xff; ) {
	383	u8 thisnodenum = nodenum;
	384	/* eventually we will want to use PNPMODE_STATIC here but for now
	385	* dynamic will help us catch buggy bioses to add to the blacklist.
	386	*/
	387	if (!pnpbios_dont_use_current_config) {
	388	if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_DYNAMIC, node))
	389	break;
	390	} else {
	391	if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_STATIC, node))
	392	break;
	393	}
	394	nodes_got++;
a2822e7f	395	dev = kcalloc(1, sizeof (struct pnp_dev), GFP_KERNEL);
1da177e4 LT	396	if (!dev)
	397	break;
	398	if(insert_device(dev,node)<0)
	399	kfree(dev);
	400	else
	401	devs++;
	402	if (nodenum <= thisnodenum) {
	403	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);
	404	break;
	405	}
	406	}
	407	kfree(node);
	408
	409	printk(KERN_INFO "PnPBIOS: %i node%s reported by PnP BIOS; %i recorded by driver\n",
	410	nodes_got, nodes_got != 1 ? "s" : "", devs);
	411	}
	412
	413	/*
	414	*
	415	* INIT AND EXIT
	416	*
	417	*/
	418
	419	static int pnpbios_disabled; /* = 0 */
	420	int pnpbios_dont_use_current_config; /* = 0 */
	421
	422	#ifndef MODULE
	423	static int __init pnpbios_setup(char *str)
	424	{
	425	int invert;
	426
	427	while ((str != NULL) && (*str != '\0')) {
	428	if (strncmp(str, "off", 3) == 0)
	429	pnpbios_disabled=1;
	430	if (strncmp(str, "on", 2) == 0)
	431	pnpbios_disabled=0;
	432	invert = (strncmp(str, "no-", 3) == 0);
	433	if (invert)
	434	str += 3;
	435	if (strncmp(str, "curr", 4) == 0)
	436	pnpbios_dont_use_current_config = invert;
	437	str = strchr(str, ',');
	438	if (str != NULL)
	439	str += strspn(str, ", \t");
	440	}
	441
	442	return 1;
	443	}
	444
	445	__setup("pnpbios=", pnpbios_setup);
	446	#endif
	447
	448	/* PnP BIOS signature: "$PnP" */
	449	#define PNP_SIGNATURE (('$' << 0) + ('P' << 8) + ('n' << 16) + ('P' << 24))
	450
	451	static int __init pnpbios_probe_system(void)
	452	{
	453	union pnp_bios_install_struct *check;
	454	u8 sum;
	455	int length, i;
	456
	457	printk(KERN_INFO "PnPBIOS: Scanning system for PnP BIOS support...\n");
	458
	459	/*
460	* Search the defined area (0xf0000-0xffff0) for a valid PnP BIOS
461	* structure and, if one is found, sets up the selectors and
462	* entry points
463	*/
464	for (check = (union pnp_bios_install_struct *) __va(0xf0000);
465	check < (union pnp_bios_install_struct *) __va(0xffff0);
466	check = (void *)check + 16) {
467	if (check->fields.signature != PNP_SIGNATURE)
468	continue;
469	printk(KERN_INFO "PnPBIOS: Found PnP BIOS installation structure at 0x%p\n", check);
470	length = check->fields.length;
471	if (!length) {
472	printk(KERN_ERR "PnPBIOS: installation structure is invalid, skipping\n");
473	continue;
474	}
475	for (sum = 0, i = 0; i < length; i++)
476	sum += check->chars[i];
477	if (sum) {
478	printk(KERN_ERR "PnPBIOS: installation structure is corrupted, skipping\n");
479	continue;
480	}
481	if (check->fields.version < 0x10) {
482	printk(KERN_WARNING "PnPBIOS: PnP BIOS version %d.%d is not supported\n",
483	check->fields.version >> 4,
484	check->fields.version & 15);
485	continue;
486	}
487	printk(KERN_INFO "PnPBIOS: PnP BIOS version %d.%d, entry 0x%x:0x%x, dseg 0x%x\n",
488	check->fields.version >> 4, check->fields.version & 15,
489	check->fields.pm16cseg, check->fields.pm16offset,
490	check->fields.pm16dseg);
491	pnp_bios_install = check;
492	return 1;
493	}
494
495	printk(KERN_INFO "PnPBIOS: PnP BIOS support was not detected.\n");
496	return 0;
497	}
498
499	static int __init exploding_pnp_bios(struct dmi_system_id *d)
500	{
501	printk(KERN_WARNING "%s detected. Disabling PnPBIOS\n", d->ident);
502	return 0;
503	}
504
ffbe5523	505	static struct dmi_system_id pnpbios_dmi_table[] __initdata = {
1da177e4 LT	506	{ /* PnPBIOS GPF on boot */
	507	.callback = exploding_pnp_bios,
	508	.ident = "Higraded P14H",
	509	.matches = {
	510	DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
	511	DMI_MATCH(DMI_BIOS_VERSION, "07.00T"),
	512	DMI_MATCH(DMI_SYS_VENDOR, "Higraded"),
	513	DMI_MATCH(DMI_PRODUCT_NAME, "P14H"),
	514	},
	515	},
	516	{ /* PnPBIOS GPF on boot */
	517	.callback = exploding_pnp_bios,
	518	.ident = "ASUS P4P800",
	519	.matches = {
	520	DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer Inc."),
	521	DMI_MATCH(DMI_BOARD_NAME, "P4P800"),
	522	},
	523	},
	524	{ }
	525	};
	526
	527	static int __init pnpbios_init(void)
	528	{
	529	int ret;
	530
	531	if (pnpbios_disabled \|\| dmi_check_system(pnpbios_dmi_table)) {
	532	printk(KERN_INFO "PnPBIOS: Disabled\n");
	533	return -ENODEV;
	534	}
	535
	536	#ifdef CONFIG_PNPACPI
	537	if (!acpi_disabled && !pnpacpi_disabled) {
	538	pnpbios_disabled = 1;
	539	printk(KERN_INFO "PnPBIOS: Disabled by ACPI PNP\n");
	540	return -ENODEV;
	541	}
	542	#endif /* CONFIG_ACPI */
	543
	544	/* scan the system for pnpbios support */
	545	if (!pnpbios_probe_system())
	546	return -ENODEV;
	547
	548	/* make preparations for bios calls */
	549	pnpbios_calls_init(pnp_bios_install);
	550
	551	/* read the node info */
	552	ret = pnp_bios_dev_node_info(&node_info);
	553	if (ret) {
	554	printk(KERN_ERR "PnPBIOS: Unable to get node info. Aborting.\n");
	555	return ret;
	556	}
	557
	558	/* register with the pnp layer */
	559	ret = pnp_register_protocol(&pnpbios_protocol);
	560	if (ret) {
	561	printk(KERN_ERR "PnPBIOS: Unable to register driver. Aborting.\n");
	562	return ret;
	563	}
	564
	565	/* start the proc interface */
	566	ret = pnpbios_proc_init();
	567	if (ret)
	568	printk(KERN_ERR "PnPBIOS: Failed to create proc interface.\n");
	569
570	/* scan for pnpbios devices */
571	build_devlist();
572
573	return 0;
574	}
575
576	subsys_initcall(pnpbios_init);
577
578	static int __init pnpbios_thread_init(void)
579	{
580	if (pnpbios_disabled)
581	return 0;
582	#ifdef CONFIG_HOTPLUG
583	init_completion(&unload_sem);
584	if (kernel_thread(pnp_dock_thread, NULL, CLONE_KERNEL) > 0)
585	unloading = 0;
586	#endif
587	return 0;
588	}
589
590	#ifndef MODULE
591
592	/* init/main.c calls pnpbios_init early */
593
594	/* Start the kernel thread later: */
595	module_init(pnpbios_thread_init);
596
597	#else
598
599	/*
600	* N.B.: Building pnpbios as a module hasn't been fully implemented
601	*/
602
603	MODULE_LICENSE("GPL");
604
605	static int __init pnpbios_init_all(void)
606	{
607	int r;
608
609	r = pnpbios_init();
610	if (r)
611	return r;
612	r = pnpbios_thread_init();
613	if (r)
614	return r;
615	return 0;
616	}
617
618	static void __exit pnpbios_exit(void)
619	{
620	#ifdef CONFIG_HOTPLUG
621	unloading = 1;
622	wait_for_completion(&unload_sem);
623	#endif
624	pnpbios_proc_exit();
625	/* We ought to free resources here */
626	return;
627	}
628
629	module_init(pnpbios_init_all);
630	module_exit(pnpbios_exit);
631
632	#endif
633
634	EXPORT_SYMBOL(pnpbios_protocol);