[mirror_ubuntu-hirsute-kernel.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/completion.h>
#include <linux/spinlock.h>
#include <linux/dmi.h>
#include <linux/delay.h>
#include <linux/acpi.h>
#include <linux/freezer.h>
#include <linux/kthread.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 (!current->fs->root) {
		return -EAGAIN;
	}
	if (!(envp = kcalloc(20, sizeof (char *), GFP_KERNEL))) {
		return -ENOMEM;
	}
	if (!(buf = kzalloc(256, GFP_KERNEL))) {
		kfree (envp);
		return -ENOMEM;
	}

	/* FIXME: if there are actual users of this, it should be integrated into
	 * the driver core and use the usual infrastructure like sysfs and uevents */
	argv [0] = "/sbin/pnpbios";
	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, UMH_WAIT_EXEC);
	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;
	set_freezable();
	while (!unloading)
	{
		int status;
		
		/*
		 * Poll every 2 seconds
		 */
		msleep_interruptible(2000);

		if (try_to_freeze())
			continue;

		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 = kzalloc(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 = kzalloc(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 = kzalloc(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 = kzalloc(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) && pnpbios_is_dynamic(dev))
		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 = kzalloc(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 =  kzalloc(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 defined(CONFIG_PPC_MERGE)
	if (check_legacy_ioport(PNPBIOS_BASE))
		return -ENODEV;
#endif
	if (pnpbios_disabled || dmi_check_system(pnpbios_dmi_table) ||
	    paravirt_enabled()) {
		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();

	pnp_platform_devices = 1;
	return 0;
}

subsys_initcall(pnpbios_init);

static int __init pnpbios_thread_init(void)
{
	struct task_struct *task;
#if defined(CONFIG_PPC_MERGE)
	if (check_legacy_ioport(PNPBIOS_BASE))
		return 0;
#endif
	if (pnpbios_disabled)
		return 0;
#ifdef CONFIG_HOTPLUG
	init_completion(&unload_sem);
	task = kthread_run(pnp_dock_thread, NULL, "kpnpbiosd");
	if (!IS_ERR(task))
		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>
1da177e4 LT	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>
7dfb7103	64	#include <linux/freezer.h>
db9c02fa	65	#include <linux/kthread.h>
1da177e4 LT	66
	67	#include <asm/page.h>
	68	#include <asm/desc.h>
	69	#include <asm/system.h>
	70	#include <asm/byteorder.h>
	71
	72	#include "pnpbios.h"
	73
	74
	75	/*
	76	*
	77	* PnP BIOS INTERFACE
	78	*
	79	*/
	80
	81	static union pnp_bios_install_struct * pnp_bios_install = NULL;
	82
	83	int pnp_bios_present(void)
	84	{
	85	return (pnp_bios_install != NULL);
	86	}
	87
	88	struct pnp_dev_node_info node_info;
	89
1da177e4 LT	90	/*
	91	*
	92	* DOCKING FUNCTIONS
	93	*
	94	*/
	95
	96	#ifdef CONFIG_HOTPLUG
	97
	98	static int unloading = 0;
	99	static struct completion unload_sem;
	100
	101	/*
	102	* (Much of this belongs in a shared routine somewhere)
	103	*/
	104
	105	static int pnp_dock_event(int dock, struct pnp_docking_station_info *info)
	106	{
	107	char argv [3], envp, buf, *scratch;
	108	int i = 0, value;
	109
1da177e4 LT	110	if (!current->fs->root) {
	111	return -EAGAIN;
	112	}
5cbded58	113	if (!(envp = kcalloc(20, sizeof (char *), GFP_KERNEL))) {
1da177e4 LT	114	return -ENOMEM;
1da177e4 LT	115	}
cd861280	116	if (!(buf = kzalloc(256, GFP_KERNEL))) {
1da177e4 LT	117	kfree (envp);
	118	return -ENOMEM;
	119	}
	120
03438211 KS	121	/* FIXME: if there are actual users of this, it should be integrated into
	122	* the driver core and use the usual infrastructure like sysfs and uevents */
	123	argv [0] = "/sbin/pnpbios";
1da177e4 LT	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
86313c48	150	value = call_usermodehelper (argv [0], argv, envp, UMH_WAIT_EXEC);
1da177e4 LT	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;
83144186	163	set_freezable();
db9c02fa	164	while (!unloading)
1da177e4 LT	165	{
	166	int status;
	167
	168	/*
	169	* Poll every 2 seconds
	170	*/
	171	msleep_interruptible(2000);
	172
db9c02fa EB	173	if (try_to_freeze())
db9c02fa EB	174	continue;
1da177e4 LT	175
	176	status = pnp_bios_dock_station_info(&now);
	177
	178	switch(status)
	179	{
	180	/*
	181	* No dock to manage
	182	*/
	183	case PNP_FUNCTION_NOT_SUPPORTED:
	184	complete_and_exit(&unload_sem, 0);
	185	case PNP_SYSTEM_NOT_DOCKED:
	186	d = 0;
	187	break;
	188	case PNP_SUCCESS:
	189	d = 1;
	190	break;
	191	default:
	192	pnpbios_print_status( "pnp_dock_thread", status );
	193	continue;
	194	}
	195	if(d != docked)
	196	{
	197	if(pnp_dock_event(d, &now)==0)
	198	{
	199	docked = d;
	200	#if 0
	201	printk(KERN_INFO "PnPBIOS: Docking station %stached\n", docked?"at":"de");
	202	#endif
	203	}
	204	}
	205	}
	206	complete_and_exit(&unload_sem, 0);
	207	}
	208
	209	#endif /* CONFIG_HOTPLUG */
	210
	211	static int pnpbios_get_resources(struct pnp_dev * dev, struct pnp_resource_table * res)
	212	{
	213	u8 nodenum = dev->number;
	214	struct pnp_bios_node * node;
	215
	216	/* just in case */
	217	if(!pnpbios_is_dynamic(dev))
	218	return -EPERM;
	219
cd861280	220	node = kzalloc(node_info.max_node_size, GFP_KERNEL);
1da177e4 LT	221	if (!node)
	222	return -1;
	223	if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_DYNAMIC, node)) {
	224	kfree(node);
	225	return -ENODEV;
	226	}
	227	pnpbios_read_resources_from_node(res, node);
	228	dev->active = pnp_is_active(dev);
	229	kfree(node);
	230	return 0;
	231	}
	232
	233	static int pnpbios_set_resources(struct pnp_dev * dev, struct pnp_resource_table * res)
	234	{
	235	u8 nodenum = dev->number;
	236	struct pnp_bios_node * node;
	237	int ret;
	238
	239	/* just in case */
	240	if (!pnpbios_is_dynamic(dev))
	241	return -EPERM;
	242
cd861280	243	node = kzalloc(node_info.max_node_size, GFP_KERNEL);
1da177e4 LT	244	if (!node)
	245	return -1;
	246	if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_DYNAMIC, node)) {
	247	kfree(node);
	248	return -ENODEV;
	249	}
	250	if(pnpbios_write_resources_to_node(res, node)<0) {
	251	kfree(node);
	252	return -1;
	253	}
	254	ret = pnp_bios_set_dev_node(node->handle, (char)PNPMODE_DYNAMIC, node);
	255	kfree(node);
	256	if (ret > 0)
	257	ret = -1;
	258	return ret;
	259	}
	260
	261	static void pnpbios_zero_data_stream(struct pnp_bios_node * node)
	262	{
	263	unsigned char * p = (char *)node->data;
	264	unsigned char * end = (char *)(node->data + node->size);
	265	unsigned int len;
	266	int i;
	267	while ((char )p < (char )end) {
	268	if(p[0] & 0x80) { /* large tag */
	269	len = (p[2] << 8) \| p[1];
	270	p += 3;
	271	} else {
	272	if (((p[0]>>3) & 0x0f) == 0x0f)
	273	return;
	274	len = p[0] & 0x07;
	275	p += 1;
	276	}
	277	for (i = 0; i < len; i++)
	278	p[i] = 0;
	279	p += len;
	280	}
	281	printk(KERN_ERR "PnPBIOS: Resource structure did not contain an end tag.\n");
	282	}
	283
	284	static int pnpbios_disable_resources(struct pnp_dev *dev)
	285	{
	286	struct pnp_bios_node * node;
	287	u8 nodenum = dev->number;
	288	int ret;
	289
	290	/* just in case */
	291	if(dev->flags & PNPBIOS_NO_DISABLE \|\| !pnpbios_is_dynamic(dev))
	292	return -EPERM;
	293
cd861280	294	node = kzalloc(node_info.max_node_size, GFP_KERNEL);
1da177e4 LT	295	if (!node)
	296	return -ENOMEM;
	297
	298	if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_DYNAMIC, node)) {
	299	kfree(node);
	300	return -ENODEV;
	301	}
	302	pnpbios_zero_data_stream(node);
	303
	304	ret = pnp_bios_set_dev_node(dev->number, (char)PNPMODE_DYNAMIC, node);
	305	kfree(node);
	306	if (ret > 0)
	307	ret = -1;
	308	return ret;
	309	}
	310
	311	/* PnP Layer support */
	312
	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,
	318	};
	319
	320	static int insert_device(struct pnp_dev dev, struct pnp_bios_node node)
	321	{
	322	struct list_head * pos;
	323	struct pnp_dev * pnp_dev;
	324	struct pnp_id *dev_id;
	325	char id[8];
	326
	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)
	332	return -1;
	333	}
	334
	335	/* set the initial values for the PnP device */
cd861280	336	dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
1da177e4 LT	337	if (!dev_id)
	338	return -1;
	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;
3ae19208	347	if (!(dev->flags & PNPBIOS_NO_DISABLE) && pnpbios_is_dynamic(dev))
1da177e4 LT	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;
	355
	356	/* clear out the damaged flags */
	357	if (!dev->active)
	358	pnp_init_resource_table(&dev->res);
	359
	360	pnp_add_device(dev);
	361	pnpbios_interface_attach_device(node);
	362
	363	return 0;
	364	}
	365
	366	static void __init build_devlist(void)
	367	{
	368	u8 nodenum;
	369	unsigned int nodes_got = 0;
	370	unsigned int devs = 0;
	371	struct pnp_bios_node *node;
	372	struct pnp_dev *dev;
	373
cd861280	374	node = kzalloc(node_info.max_node_size, GFP_KERNEL);
1da177e4 LT	375	if (!node)
	376	return;
	377
	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.
	382	*/
	383	if (!pnpbios_dont_use_current_config) {
	384	if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_DYNAMIC, node))
	385	break;
	386	} else {
	387	if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_STATIC, node))
	388	break;
	389	}
	390	nodes_got++;
cd861280	391	dev = kzalloc(sizeof (struct pnp_dev), GFP_KERNEL);
1da177e4 LT	392	if (!dev)
	393	break;
	394	if(insert_device(dev,node)<0)
	395	kfree(dev);
	396	else
	397	devs++;
	398	if (nodenum <= thisnodenum) {
	399	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);
	400	break;
	401	}
	402	}
	403	kfree(node);
	404
	405	printk(KERN_INFO "PnPBIOS: %i node%s reported by PnP BIOS; %i recorded by driver\n",
	406	nodes_got, nodes_got != 1 ? "s" : "", devs);
	407	}
	408
	409	/*
	410	*
	411	* INIT AND EXIT
	412	*
	413	*/
	414
	415	static int pnpbios_disabled; /* = 0 */
	416	int pnpbios_dont_use_current_config; /* = 0 */
	417
	418	#ifndef MODULE
	419	static int __init pnpbios_setup(char *str)
	420	{
	421	int invert;
	422
	423	while ((str != NULL) && (*str != '\0')) {
	424	if (strncmp(str, "off", 3) == 0)
	425	pnpbios_disabled=1;
	426	if (strncmp(str, "on", 2) == 0)
	427	pnpbios_disabled=0;
	428	invert = (strncmp(str, "no-", 3) == 0);
	429	if (invert)
	430	str += 3;
	431	if (strncmp(str, "curr", 4) == 0)
	432	pnpbios_dont_use_current_config = invert;
	433	str = strchr(str, ',');
	434	if (str != NULL)
	435	str += strspn(str, ", \t");
	436	}
	437
	438	return 1;
	439	}
	440
	441	__setup("pnpbios=", pnpbios_setup);
	442	#endif
	443
	444	/* PnP BIOS signature: "$PnP" */
	445	#define PNP_SIGNATURE (('$' << 0) + ('P' << 8) + ('n' << 16) + ('P' << 24))
	446
	447	static int __init pnpbios_probe_system(void)
	448	{
	449	union pnp_bios_install_struct *check;
	450	u8 sum;
	451	int length, i;
	452
	453	printk(KERN_INFO "PnPBIOS: Scanning system for PnP BIOS support...\n");
	454
	455	/*
456	* Search the defined area (0xf0000-0xffff0) for a valid PnP BIOS
457	* structure and, if one is found, sets up the selectors and
458	* entry points
459	*/
460	for (check = (union pnp_bios_install_struct *) __va(0xf0000);
461	check < (union pnp_bios_install_struct *) __va(0xffff0);
462	check = (void *)check + 16) {
463	if (check->fields.signature != PNP_SIGNATURE)
464	continue;
465	printk(KERN_INFO "PnPBIOS: Found PnP BIOS installation structure at 0x%p\n", check);
466	length = check->fields.length;
467	if (!length) {
468	printk(KERN_ERR "PnPBIOS: installation structure is invalid, skipping\n");
469	continue;
470	}
471	for (sum = 0, i = 0; i < length; i++)
472	sum += check->chars[i];
473	if (sum) {
474	printk(KERN_ERR "PnPBIOS: installation structure is corrupted, skipping\n");
475	continue;
476	}
477	if (check->fields.version < 0x10) {
478	printk(KERN_WARNING "PnPBIOS: PnP BIOS version %d.%d is not supported\n",
479	check->fields.version >> 4,
480	check->fields.version & 15);
481	continue;
482	}
483	printk(KERN_INFO "PnPBIOS: PnP BIOS version %d.%d, entry 0x%x:0x%x, dseg 0x%x\n",
484	check->fields.version >> 4, check->fields.version & 15,
485	check->fields.pm16cseg, check->fields.pm16offset,
486	check->fields.pm16dseg);
487	pnp_bios_install = check;
488	return 1;
489	}
490
491	printk(KERN_INFO "PnPBIOS: PnP BIOS support was not detected.\n");
492	return 0;
493	}
494
495	static int __init exploding_pnp_bios(struct dmi_system_id *d)
496	{
497	printk(KERN_WARNING "%s detected. Disabling PnPBIOS\n", d->ident);
498	return 0;
499	}
500
ffbe5523	501	static struct dmi_system_id pnpbios_dmi_table[] __initdata = {
1da177e4 LT	502	{ /* PnPBIOS GPF on boot */
	503	.callback = exploding_pnp_bios,
	504	.ident = "Higraded P14H",
	505	.matches = {
	506	DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
	507	DMI_MATCH(DMI_BIOS_VERSION, "07.00T"),
	508	DMI_MATCH(DMI_SYS_VENDOR, "Higraded"),
	509	DMI_MATCH(DMI_PRODUCT_NAME, "P14H"),
	510	},
	511	},
	512	{ /* PnPBIOS GPF on boot */
	513	.callback = exploding_pnp_bios,
	514	.ident = "ASUS P4P800",
	515	.matches = {
	516	DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer Inc."),
	517	DMI_MATCH(DMI_BOARD_NAME, "P4P800"),
	518	},
	519	},
	520	{ }
	521	};
	522
	523	static int __init pnpbios_init(void)
	524	{
	525	int ret;
	526
30cbc222 OH	527	#if defined(CONFIG_PPC_MERGE)
	528	if (check_legacy_ioport(PNPBIOS_BASE))
	529	return -ENODEV;
	530	#endif
6020c8f3 RR	531	if (pnpbios_disabled \|\| dmi_check_system(pnpbios_dmi_table) \|\|
6020c8f3 RR	532	paravirt_enabled()) {
1da177e4 LT	533	printk(KERN_INFO "PnPBIOS: Disabled\n");
	534	return -ENODEV;
	535	}
	536
	537	#ifdef CONFIG_PNPACPI
	538	if (!acpi_disabled && !pnpacpi_disabled) {
	539	pnpbios_disabled = 1;
	540	printk(KERN_INFO "PnPBIOS: Disabled by ACPI PNP\n");
	541	return -ENODEV;
	542	}
	543	#endif /* CONFIG_ACPI */
	544
	545	/* scan the system for pnpbios support */
	546	if (!pnpbios_probe_system())
	547	return -ENODEV;
	548
	549	/* make preparations for bios calls */
	550	pnpbios_calls_init(pnp_bios_install);
	551
	552	/* read the node info */
	553	ret = pnp_bios_dev_node_info(&node_info);
	554	if (ret) {
	555	printk(KERN_ERR "PnPBIOS: Unable to get node info. Aborting.\n");
	556	return ret;
	557	}
	558
	559	/* register with the pnp layer */
	560	ret = pnp_register_protocol(&pnpbios_protocol);
	561	if (ret) {
	562	printk(KERN_ERR "PnPBIOS: Unable to register driver. Aborting.\n");
	563	return ret;
	564	}
	565
	566	/* start the proc interface */
	567	ret = pnpbios_proc_init();
	568	if (ret)
	569	printk(KERN_ERR "PnPBIOS: Failed to create proc interface.\n");
	570
	571	/* scan for pnpbios devices */
	572	build_devlist();
	573
8f81dd14	574	pnp_platform_devices = 1;
1da177e4 LT	575	return 0;
	576	}
	577
	578	subsys_initcall(pnpbios_init);
	579
	580	static int __init pnpbios_thread_init(void)
	581	{
db9c02fa	582	struct task_struct *task;
30cbc222 OH	583	#if defined(CONFIG_PPC_MERGE)
	584	if (check_legacy_ioport(PNPBIOS_BASE))
	585	return 0;
	586	#endif
1da177e4 LT	587	if (pnpbios_disabled)
	588	return 0;
	589	#ifdef CONFIG_HOTPLUG
	590	init_completion(&unload_sem);
db9c02fa EB	591	task = kthread_run(pnp_dock_thread, NULL, "kpnpbiosd");
db9c02fa EB	592	if (!IS_ERR(task))
1da177e4 LT	593	unloading = 0;
	594	#endif
	595	return 0;
	596	}
	597
	598	#ifndef MODULE
	599
	600	/* init/main.c calls pnpbios_init early */
	601
	602	/* Start the kernel thread later: */
	603	module_init(pnpbios_thread_init);
	604
	605	#else
	606
	607	/*
	608	* N.B.: Building pnpbios as a module hasn't been fully implemented
	609	*/
	610
	611	MODULE_LICENSE("GPL");
	612
	613	static int __init pnpbios_init_all(void)
	614	{
	615	int r;
	616
	617	r = pnpbios_init();
	618	if (r)
	619	return r;
	620	r = pnpbios_thread_init();
	621	if (r)
	622	return r;
	623	return 0;
	624	}
	625
	626	static void __exit pnpbios_exit(void)
	627	{
	628	#ifdef CONFIG_HOTPLUG
	629	unloading = 1;
	630	wait_for_completion(&unload_sem);
	631	#endif
	632	pnpbios_proc_exit();
	633	/* We ought to free resources here */
	634	return;
	635	}
	636
	637	module_init(pnpbios_init_all);
	638	module_exit(pnpbios_exit);
	639
	640	#endif
	641
	642	EXPORT_SYMBOL(pnpbios_protocol);