[GitHub/mt8127/android_kernel_alcatel_ttab.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 <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 = (char **) kcalloc (20, sizeof (char *), GFP_KERNEL))) {
		return -ENOMEM;
	}
	if (!(buf = kcalloc (1, 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, 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) && 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 = 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 defined(CONFIG_PPC_MERGE)
	if (check_legacy_ioport(PNPBIOS_BASE))
		return -ENODEV;
#endif
	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 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);
	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>
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>
1da177e4 LT	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
1da177e4 LT	109	if (!current->fs->root) {
	110	return -EAGAIN;
	111	}
a2822e7f	112	if (!(envp = (char *) kcalloc (20, sizeof (char ), GFP_KERNEL))) {
1da177e4 LT	113	return -ENOMEM;
1da177e4 LT	114	}
a2822e7f	115	if (!(buf = kcalloc (1, 256, GFP_KERNEL))) {
1da177e4 LT	116	kfree (envp);
	117	return -ENOMEM;
	118	}
	119
03438211 KS	120	/* FIXME: if there are actual users of this, it should be integrated into
	121	* the driver core and use the usual infrastructure like sysfs and uevents */
	122	argv [0] = "/sbin/pnpbios";
1da177e4 LT	123	argv [1] = "dock";
	124	argv [2] = NULL;
	125
	126	/* minimal command environment */
	127	envp [i++] = "HOME=/";
	128	envp [i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
	129
	130	#ifdef DEBUG
	131	/* hint that policy agent should enter no-stdout debug mode */
	132	envp [i++] = "DEBUG=kernel";
	133	#endif
	134	/* extensible set of named bus-specific parameters,
	135	* supporting multiple driver selection algorithms.
	136	*/
	137	scratch = buf;
	138
	139	/* action: add, remove */
	140	envp [i++] = scratch;
	141	scratch += sprintf (scratch, "ACTION=%s", dock?"add":"remove") + 1;
	142
	143	/* Report the ident for the dock */
	144	envp [i++] = scratch;
	145	scratch += sprintf (scratch, "DOCK=%x/%x/%x",
	146	info->location_id, info->serial, info->capabilities);
	147	envp[i] = NULL;
	148
	149	value = call_usermodehelper (argv [0], argv, envp, 0);
	150	kfree (buf);
	151	kfree (envp);
	152	return 0;
	153	}
	154
	155	/*
	156	* Poll the PnP docking at regular intervals
	157	*/
	158	static int pnp_dock_thread(void * unused)
	159	{
	160	static struct pnp_docking_station_info now;
	161	int docked = -1, d = 0;
	162	daemonize("kpnpbiosd");
	163	allow_signal(SIGKILL);
	164	while(!unloading && !signal_pending(current))
	165	{
	166	int status;
	167
	168	/*
	169	* Poll every 2 seconds
	170	*/
	171	msleep_interruptible(2000);
	172
	173	if(signal_pending(current)) {
3e1d1d28	174	if (try_to_freeze())
1da177e4 LT	175	continue;
	176	break;
	177	}
	178
	179	status = pnp_bios_dock_station_info(&now);
	180
	181	switch(status)
	182	{
	183	/*
	184	* No dock to manage
	185	*/
	186	case PNP_FUNCTION_NOT_SUPPORTED:
	187	complete_and_exit(&unload_sem, 0);
	188	case PNP_SYSTEM_NOT_DOCKED:
	189	d = 0;
	190	break;
	191	case PNP_SUCCESS:
	192	d = 1;
	193	break;
	194	default:
	195	pnpbios_print_status( "pnp_dock_thread", status );
	196	continue;
	197	}
	198	if(d != docked)
	199	{
	200	if(pnp_dock_event(d, &now)==0)
	201	{
	202	docked = d;
	203	#if 0
	204	printk(KERN_INFO "PnPBIOS: Docking station %stached\n", docked?"at":"de");
	205	#endif
	206	}
	207	}
	208	}
	209	complete_and_exit(&unload_sem, 0);
	210	}
	211
	212	#endif /* CONFIG_HOTPLUG */
	213
	214	static int pnpbios_get_resources(struct pnp_dev * dev, struct pnp_resource_table * res)
	215	{
	216	u8 nodenum = dev->number;
	217	struct pnp_bios_node * node;
	218
	219	/* just in case */
	220	if(!pnpbios_is_dynamic(dev))
	221	return -EPERM;
	222
a2822e7f	223	node = kcalloc(1, node_info.max_node_size, GFP_KERNEL);
1da177e4 LT	224	if (!node)
	225	return -1;
	226	if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_DYNAMIC, node)) {
	227	kfree(node);
	228	return -ENODEV;
	229	}
	230	pnpbios_read_resources_from_node(res, node);
	231	dev->active = pnp_is_active(dev);
	232	kfree(node);
	233	return 0;
	234	}
	235
	236	static int pnpbios_set_resources(struct pnp_dev * dev, struct pnp_resource_table * res)
	237	{
	238	u8 nodenum = dev->number;
	239	struct pnp_bios_node * node;
	240	int ret;
	241
	242	/* just in case */
	243	if (!pnpbios_is_dynamic(dev))
	244	return -EPERM;
	245
a2822e7f	246	node = kcalloc(1, node_info.max_node_size, GFP_KERNEL);
1da177e4 LT	247	if (!node)
	248	return -1;
	249	if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_DYNAMIC, node)) {
	250	kfree(node);
	251	return -ENODEV;
	252	}
	253	if(pnpbios_write_resources_to_node(res, node)<0) {
	254	kfree(node);
	255	return -1;
	256	}
	257	ret = pnp_bios_set_dev_node(node->handle, (char)PNPMODE_DYNAMIC, node);
	258	kfree(node);
	259	if (ret > 0)
	260	ret = -1;
	261	return ret;
	262	}
	263
	264	static void pnpbios_zero_data_stream(struct pnp_bios_node * node)
	265	{
	266	unsigned char * p = (char *)node->data;
	267	unsigned char * end = (char *)(node->data + node->size);
	268	unsigned int len;
	269	int i;
	270	while ((char )p < (char )end) {
	271	if(p[0] & 0x80) { /* large tag */
	272	len = (p[2] << 8) \| p[1];
	273	p += 3;
	274	} else {
	275	if (((p[0]>>3) & 0x0f) == 0x0f)
	276	return;
	277	len = p[0] & 0x07;
	278	p += 1;
	279	}
	280	for (i = 0; i < len; i++)
	281	p[i] = 0;
	282	p += len;
	283	}
	284	printk(KERN_ERR "PnPBIOS: Resource structure did not contain an end tag.\n");
	285	}
	286
	287	static int pnpbios_disable_resources(struct pnp_dev *dev)
	288	{
	289	struct pnp_bios_node * node;
	290	u8 nodenum = dev->number;
	291	int ret;
	292
	293	/* just in case */
	294	if(dev->flags & PNPBIOS_NO_DISABLE \|\| !pnpbios_is_dynamic(dev))
	295	return -EPERM;
	296
a2822e7f	297	node = kcalloc(1, node_info.max_node_size, GFP_KERNEL);
1da177e4 LT	298	if (!node)
	299	return -ENOMEM;
	300
	301	if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_DYNAMIC, node)) {
	302	kfree(node);
	303	return -ENODEV;
	304	}
	305	pnpbios_zero_data_stream(node);
	306
	307	ret = pnp_bios_set_dev_node(dev->number, (char)PNPMODE_DYNAMIC, node);
	308	kfree(node);
	309	if (ret > 0)
	310	ret = -1;
	311	return ret;
	312	}
	313
	314	/* PnP Layer support */
	315
	316	struct pnp_protocol pnpbios_protocol = {
	317	.name = "Plug and Play BIOS",
	318	.get = pnpbios_get_resources,
	319	.set = pnpbios_set_resources,
	320	.disable = pnpbios_disable_resources,
	321	};
	322
	323	static int insert_device(struct pnp_dev dev, struct pnp_bios_node node)
	324	{
	325	struct list_head * pos;
	326	struct pnp_dev * pnp_dev;
	327	struct pnp_id *dev_id;
	328	char id[8];
	329
	330	/* check if the device is already added */
	331	dev->number = node->handle;
	332	list_for_each (pos, &pnpbios_protocol.devices){
	333	pnp_dev = list_entry(pos, struct pnp_dev, protocol_list);
	334	if (dev->number == pnp_dev->number)
	335	return -1;
	336	}
	337
	338	/* set the initial values for the PnP device */
a2822e7f	339	dev_id = kcalloc(1, sizeof(struct pnp_id), GFP_KERNEL);
1da177e4 LT	340	if (!dev_id)
	341	return -1;
	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;
3ae19208	350	if (!(dev->flags & PNPBIOS_NO_DISABLE) && pnpbios_is_dynamic(dev))
1da177e4 LT	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;
	358
	359	/* clear out the damaged flags */
	360	if (!dev->active)
	361	pnp_init_resource_table(&dev->res);
	362
	363	pnp_add_device(dev);
	364	pnpbios_interface_attach_device(node);
	365
	366	return 0;
	367	}
	368
	369	static void __init build_devlist(void)
	370	{
	371	u8 nodenum;
	372	unsigned int nodes_got = 0;
	373	unsigned int devs = 0;
	374	struct pnp_bios_node *node;
	375	struct pnp_dev *dev;
	376
a2822e7f	377	node = kcalloc(1, node_info.max_node_size, GFP_KERNEL);
1da177e4 LT	378	if (!node)
	379	return;
	380
	381	for(nodenum=0; nodenum<0xff; ) {
	382	u8 thisnodenum = nodenum;
	383	/* eventually we will want to use PNPMODE_STATIC here but for now
	384	* dynamic will help us catch buggy bioses to add to the blacklist.
	385	*/
	386	if (!pnpbios_dont_use_current_config) {
	387	if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_DYNAMIC, node))
	388	break;
	389	} else {
	390	if (pnp_bios_get_dev_node(&nodenum, (char )PNPMODE_STATIC, node))
	391	break;
	392	}
	393	nodes_got++;
a2822e7f	394	dev = kcalloc(1, sizeof (struct pnp_dev), GFP_KERNEL);
1da177e4 LT	395	if (!dev)
	396	break;
	397	if(insert_device(dev,node)<0)
	398	kfree(dev);
	399	else
	400	devs++;
	401	if (nodenum <= thisnodenum) {
	402	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);
	403	break;
	404	}
	405	}
	406	kfree(node);
	407
	408	printk(KERN_INFO "PnPBIOS: %i node%s reported by PnP BIOS; %i recorded by driver\n",
	409	nodes_got, nodes_got != 1 ? "s" : "", devs);
	410	}
	411
	412	/*
	413	*
	414	* INIT AND EXIT
	415	*
	416	*/
	417
	418	static int pnpbios_disabled; /* = 0 */
	419	int pnpbios_dont_use_current_config; /* = 0 */
	420
	421	#ifndef MODULE
	422	static int __init pnpbios_setup(char *str)
	423	{
	424	int invert;
	425
	426	while ((str != NULL) && (*str != '\0')) {
	427	if (strncmp(str, "off", 3) == 0)
	428	pnpbios_disabled=1;
	429	if (strncmp(str, "on", 2) == 0)
	430	pnpbios_disabled=0;
	431	invert = (strncmp(str, "no-", 3) == 0);
	432	if (invert)
	433	str += 3;
	434	if (strncmp(str, "curr", 4) == 0)
	435	pnpbios_dont_use_current_config = invert;
	436	str = strchr(str, ',');
	437	if (str != NULL)
	438	str += strspn(str, ", \t");
	439	}
	440
	441	return 1;
	442	}
	443
	444	__setup("pnpbios=", pnpbios_setup);
	445	#endif
	446
	447	/* PnP BIOS signature: "$PnP" */
	448	#define PNP_SIGNATURE (('$' << 0) + ('P' << 8) + ('n' << 16) + ('P' << 24))
	449
	450	static int __init pnpbios_probe_system(void)
	451	{
	452	union pnp_bios_install_struct *check;
	453	u8 sum;
	454	int length, i;
	455
	456	printk(KERN_INFO "PnPBIOS: Scanning system for PnP BIOS support...\n");
	457
	458	/*
459	* Search the defined area (0xf0000-0xffff0) for a valid PnP BIOS
460	* structure and, if one is found, sets up the selectors and
461	* entry points
462	*/
463	for (check = (union pnp_bios_install_struct *) __va(0xf0000);
464	check < (union pnp_bios_install_struct *) __va(0xffff0);
465	check = (void *)check + 16) {
466	if (check->fields.signature != PNP_SIGNATURE)
467	continue;
468	printk(KERN_INFO "PnPBIOS: Found PnP BIOS installation structure at 0x%p\n", check);
469	length = check->fields.length;
470	if (!length) {
471	printk(KERN_ERR "PnPBIOS: installation structure is invalid, skipping\n");
472	continue;
473	}
474	for (sum = 0, i = 0; i < length; i++)
475	sum += check->chars[i];
476	if (sum) {
477	printk(KERN_ERR "PnPBIOS: installation structure is corrupted, skipping\n");
478	continue;
479	}
480	if (check->fields.version < 0x10) {
481	printk(KERN_WARNING "PnPBIOS: PnP BIOS version %d.%d is not supported\n",
482	check->fields.version >> 4,
483	check->fields.version & 15);
484	continue;
485	}
486	printk(KERN_INFO "PnPBIOS: PnP BIOS version %d.%d, entry 0x%x:0x%x, dseg 0x%x\n",
487	check->fields.version >> 4, check->fields.version & 15,
488	check->fields.pm16cseg, check->fields.pm16offset,
489	check->fields.pm16dseg);
490	pnp_bios_install = check;
491	return 1;
492	}
493
494	printk(KERN_INFO "PnPBIOS: PnP BIOS support was not detected.\n");
495	return 0;
496	}
497
498	static int __init exploding_pnp_bios(struct dmi_system_id *d)
499	{
500	printk(KERN_WARNING "%s detected. Disabling PnPBIOS\n", d->ident);
501	return 0;
502	}
503
ffbe5523	504	static struct dmi_system_id pnpbios_dmi_table[] __initdata = {
1da177e4 LT	505	{ /* PnPBIOS GPF on boot */
	506	.callback = exploding_pnp_bios,
	507	.ident = "Higraded P14H",
	508	.matches = {
	509	DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
	510	DMI_MATCH(DMI_BIOS_VERSION, "07.00T"),
	511	DMI_MATCH(DMI_SYS_VENDOR, "Higraded"),
	512	DMI_MATCH(DMI_PRODUCT_NAME, "P14H"),
	513	},
	514	},
	515	{ /* PnPBIOS GPF on boot */
	516	.callback = exploding_pnp_bios,
	517	.ident = "ASUS P4P800",
	518	.matches = {
	519	DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer Inc."),
	520	DMI_MATCH(DMI_BOARD_NAME, "P4P800"),
	521	},
	522	},
	523	{ }
	524	};
	525
	526	static int __init pnpbios_init(void)
	527	{
	528	int ret;
	529
30cbc222 OH	530	#if defined(CONFIG_PPC_MERGE)
	531	if (check_legacy_ioport(PNPBIOS_BASE))
	532	return -ENODEV;
	533	#endif
1da177e4 LT	534	if (pnpbios_disabled \|\| dmi_check_system(pnpbios_dmi_table)) {
	535	printk(KERN_INFO "PnPBIOS: Disabled\n");
	536	return -ENODEV;
	537	}
	538
	539	#ifdef CONFIG_PNPACPI
	540	if (!acpi_disabled && !pnpacpi_disabled) {
	541	pnpbios_disabled = 1;
	542	printk(KERN_INFO "PnPBIOS: Disabled by ACPI PNP\n");
	543	return -ENODEV;
	544	}
	545	#endif /* CONFIG_ACPI */
	546
	547	/* scan the system for pnpbios support */
	548	if (!pnpbios_probe_system())
	549	return -ENODEV;
	550
	551	/* make preparations for bios calls */
	552	pnpbios_calls_init(pnp_bios_install);
	553
	554	/* read the node info */
	555	ret = pnp_bios_dev_node_info(&node_info);
	556	if (ret) {
	557	printk(KERN_ERR "PnPBIOS: Unable to get node info. Aborting.\n");
	558	return ret;
	559	}
	560
	561	/* register with the pnp layer */
	562	ret = pnp_register_protocol(&pnpbios_protocol);
	563	if (ret) {
	564	printk(KERN_ERR "PnPBIOS: Unable to register driver. Aborting.\n");
	565	return ret;
	566	}
	567
	568	/* start the proc interface */
	569	ret = pnpbios_proc_init();
	570	if (ret)
	571	printk(KERN_ERR "PnPBIOS: Failed to create proc interface.\n");
	572
	573	/* scan for pnpbios devices */
	574	build_devlist();
	575
	576	return 0;
	577	}
	578
	579	subsys_initcall(pnpbios_init);
	580
	581	static int __init pnpbios_thread_init(void)
	582	{
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);
	591	if (kernel_thread(pnp_dock_thread, NULL, CLONE_KERNEL) > 0)
	592	unloading = 0;
	593	#endif
	594	return 0;
	595	}
	596
	597	#ifndef MODULE
	598
	599	/* init/main.c calls pnpbios_init early */
	600
	601	/* Start the kernel thread later: */
	602	module_init(pnpbios_thread_init);
	603
	604	#else
	605
	606	/*
	607	* N.B.: Building pnpbios as a module hasn't been fully implemented
	608	*/
	609
	610	MODULE_LICENSE("GPL");
	611
	612	static int __init pnpbios_init_all(void)
	613	{
	614	int r;
	615
	616	r = pnpbios_init();
	617	if (r)
	618	return r;
	619	r = pnpbios_thread_init();
	620	if (r)
	621	return r;
	622	return 0;
	623	}
	624
	625	static void __exit pnpbios_exit(void)
	626	{
	627	#ifdef CONFIG_HOTPLUG
	628	unloading = 1;
	629	wait_for_completion(&unload_sem);
	630	#endif
	631	pnpbios_proc_exit();
	632	/* We ought to free resources here */
	633	return;
	634	}
	635
	636	module_init(pnpbios_init_all);
	637	module_exit(pnpbios_exit);
	638
	639	#endif
	640
	641	EXPORT_SYMBOL(pnpbios_protocol);