[mirror_ubuntu-artful-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/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/byteorder.h>

#include "../base.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
 *
 */

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 (!(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 (1) {
		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);
}

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

	if (!pnpbios_is_dynamic(dev))
		return -EPERM;

	pnp_dbg(&dev->dev, "get resources\n");
	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(dev, node);
	dev->active = pnp_is_active(dev);
	kfree(node);
	return 0;
}

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

	if (!pnpbios_is_dynamic(dev))
		return -EPERM;

	pnp_dbg(&dev->dev, "set resources\n");
	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(dev, 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;

	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 __init insert_device(struct pnp_bios_node *node)
{
	struct list_head *pos;
	struct pnp_dev *dev;
	char id[8];

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

	pnp_eisa_id_to_string(node->eisa_id & PNP_EISA_ID_MASK, id);
	dev = pnp_alloc_dev(&pnpbios_protocol, node->handle, id);
	if (!dev)
		return -1;

	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;

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

	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;

	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++;
		if (insert_device(node) == 0)
			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;
int pnpbios_dont_use_current_config;

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);

/* 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(const 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) ||
	    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;
}

fs_initcall(pnpbios_init);

static int __init pnpbios_thread_init(void)
{
	struct task_struct *task;

	if (pnpbios_disabled)
		return 0;

	init_completion(&unload_sem);
	task = kthread_run(pnp_dock_thread, NULL, "kpnpbiosd");
	if (IS_ERR(task))
		return PTR_ERR(task);

	return 0;
}

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

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	*/
9dd78466	35
1da177e4 LT	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>
1da177e4 LT	53	#include <linux/device.h>
	54	#include <linux/pnp.h>
	55	#include <linux/mm.h>
	56	#include <linux/smp.h>
	57	#include <linux/slab.h>
1da177e4 LT	58	#include <linux/completion.h>
	59	#include <linux/spinlock.h>
	60	#include <linux/dmi.h>
	61	#include <linux/delay.h>
	62	#include <linux/acpi.h>
7dfb7103	63	#include <linux/freezer.h>
db9c02fa	64	#include <linux/kthread.h>
1da177e4 LT	65
	66	#include <asm/page.h>
	67	#include <asm/desc.h>
1da177e4 LT	68	#include <asm/byteorder.h>
1da177e4 LT	69
1692b27b	70	#include "../base.h"
1da177e4 LT	71	#include "pnpbios.h"
1da177e4 LT	72
1da177e4 LT	73	/*
	74	*
	75	* PnP BIOS INTERFACE
	76	*
	77	*/
	78
9dd78466	79	static union pnp_bios_install_struct *pnp_bios_install = NULL;
1da177e4 LT	80
	81	int pnp_bios_present(void)
	82	{
	83	return (pnp_bios_install != NULL);
	84	}
	85
	86	struct pnp_dev_node_info node_info;
	87
1da177e4 LT	88	/*
	89	*
	90	* DOCKING FUNCTIONS
	91	*
	92	*/
	93
1da177e4 LT	94	static struct completion unload_sem;
	95
	96	/*
	97	* (Much of this belongs in a shared routine somewhere)
	98	*/
1da177e4 LT	99	static int pnp_dock_event(int dock, struct pnp_docking_station_info *info)
1da177e4 LT	100	{
9dd78466	101	char argv[3], envp, buf, *scratch;
1da177e4 LT	102	int i = 0, value;
1da177e4 LT	103
07d4e9af	104	if (!(envp = kcalloc(20, sizeof(char *), GFP_KERNEL)))
1da177e4	105	return -ENOMEM;
cd861280	106	if (!(buf = kzalloc(256, GFP_KERNEL))) {
9dd78466	107	kfree(envp);
1da177e4 LT	108	return -ENOMEM;
	109	}
	110
07d4e9af BH	111	/* FIXME: if there are actual users of this, it should be
	112	* integrated into the driver core and use the usual infrastructure
	113	* like sysfs and uevents
	114	*/
9dd78466 BH	115	argv[0] = "/sbin/pnpbios";
	116	argv[1] = "dock";
	117	argv[2] = NULL;
1da177e4 LT	118
1da177e4 LT	119	/* minimal command environment */
9dd78466 BH	120	envp[i++] = "HOME=/";
9dd78466 BH	121	envp[i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
1da177e4 LT	122
	123	#ifdef DEBUG
	124	/* hint that policy agent should enter no-stdout debug mode */
9dd78466	125	envp[i++] = "DEBUG=kernel";
1da177e4 LT	126	#endif
	127	/* extensible set of named bus-specific parameters,
	128	* supporting multiple driver selection algorithms.
	129	*/
	130	scratch = buf;
	131
	132	/* action: add, remove */
9dd78466 BH	133	envp[i++] = scratch;
9dd78466 BH	134	scratch += sprintf(scratch, "ACTION=%s", dock ? "add" : "remove") + 1;
1da177e4 LT	135
1da177e4 LT	136	/* Report the ident for the dock */
9dd78466 BH	137	envp[i++] = scratch;
	138	scratch += sprintf(scratch, "DOCK=%x/%x/%x",
	139	info->location_id, info->serial, info->capabilities);
1da177e4	140	envp[i] = NULL;
9dd78466	141
07d4e9af	142	value = call_usermodehelper(argv [0], argv, envp, UMH_WAIT_EXEC);
9dd78466 BH	143	kfree(buf);
9dd78466 BH	144	kfree(envp);
1da177e4 LT	145	return 0;
	146	}
	147
	148	/*
	149	* Poll the PnP docking at regular intervals
	150	*/
9dd78466	151	static int pnp_dock_thread(void *unused)
1da177e4 LT	152	{
	153	static struct pnp_docking_station_info now;
	154	int docked = -1, d = 0;
07d4e9af	155
83144186	156	set_freezable();
b277c884	157	while (1) {
1da177e4	158	int status;
9dd78466	159
1da177e4 LT	160	/*
	161	* Poll every 2 seconds
	162	*/
	163	msleep_interruptible(2000);
	164
db9c02fa EB	165	if (try_to_freeze())
db9c02fa EB	166	continue;
1da177e4 LT	167
	168	status = pnp_bios_dock_station_info(&now);
	169
9dd78466	170	switch (status) {
1da177e4 LT	171	/*
	172	* No dock to manage
	173	*/
9dd78466 BH	174	case PNP_FUNCTION_NOT_SUPPORTED:
	175	complete_and_exit(&unload_sem, 0);
	176	case PNP_SYSTEM_NOT_DOCKED:
	177	d = 0;
	178	break;
	179	case PNP_SUCCESS:
	180	d = 1;
	181	break;
	182	default:
	183	pnpbios_print_status("pnp_dock_thread", status);
	184	continue;
1da177e4	185	}
9dd78466 BH	186	if (d != docked) {
9dd78466 BH	187	if (pnp_dock_event(d, &now) == 0) {
1da177e4 LT	188	docked = d;
1da177e4 LT	189	#if 0
9dd78466 BH	190	printk(KERN_INFO
	191	"PnPBIOS: Docking station %stached\n",
	192	docked ? "at" : "de");
1da177e4 LT	193	#endif
	194	}
	195	}
	196	}
	197	complete_and_exit(&unload_sem, 0);
	198	}
	199
59284cb4	200	static int pnpbios_get_resources(struct pnp_dev *dev)
1da177e4 LT	201	{
1da177e4 LT	202	u8 nodenum = dev->number;
9dd78466	203	struct pnp_bios_node *node;
1da177e4	204
9dd78466	205	if (!pnpbios_is_dynamic(dev))
1da177e4 LT	206	return -EPERM;
1da177e4 LT	207
2f53432c	208	pnp_dbg(&dev->dev, "get resources\n");
cd861280	209	node = kzalloc(node_info.max_node_size, GFP_KERNEL);
1da177e4 LT	210	if (!node)
1da177e4 LT	211	return -1;
9dd78466	212	if (pnp_bios_get_dev_node(&nodenum, (char)PNPMODE_DYNAMIC, node)) {
1da177e4 LT	213	kfree(node);
	214	return -ENODEV;
	215	}
4ab55d8d	216	pnpbios_read_resources_from_node(dev, node);
1da177e4 LT	217	dev->active = pnp_is_active(dev);
	218	kfree(node);
	219	return 0;
	220	}
	221
59284cb4	222	static int pnpbios_set_resources(struct pnp_dev *dev)
1da177e4 LT	223	{
1da177e4 LT	224	u8 nodenum = dev->number;
9dd78466	225	struct pnp_bios_node *node;
1da177e4 LT	226	int ret;
1da177e4 LT	227
1da177e4 LT	228	if (!pnpbios_is_dynamic(dev))
	229	return -EPERM;
	230
2f53432c	231	pnp_dbg(&dev->dev, "set resources\n");
cd861280	232	node = kzalloc(node_info.max_node_size, GFP_KERNEL);
1da177e4 LT	233	if (!node)
1da177e4 LT	234	return -1;
9dd78466	235	if (pnp_bios_get_dev_node(&nodenum, (char)PNPMODE_DYNAMIC, node)) {
1da177e4 LT	236	kfree(node);
	237	return -ENODEV;
	238	}
4ab55d8d	239	if (pnpbios_write_resources_to_node(dev, node) < 0) {
1da177e4 LT	240	kfree(node);
	241	return -1;
	242	}
	243	ret = pnp_bios_set_dev_node(node->handle, (char)PNPMODE_DYNAMIC, node);
	244	kfree(node);
	245	if (ret > 0)
	246	ret = -1;
	247	return ret;
	248	}
	249
9dd78466	250	static void pnpbios_zero_data_stream(struct pnp_bios_node *node)
1da177e4	251	{
9dd78466 BH	252	unsigned char p = (char )node->data;
9dd78466 BH	253	unsigned char end = (char )(node->data + node->size);
1da177e4 LT	254	unsigned int len;
1da177e4 LT	255	int i;
07d4e9af	256
1da177e4	257	while ((char )p < (char )end) {
9dd78466	258	if (p[0] & 0x80) { /* large tag */
1da177e4 LT	259	len = (p[2] << 8) \| p[1];
	260	p += 3;
	261	} else {
9dd78466	262	if (((p[0] >> 3) & 0x0f) == 0x0f)
1da177e4 LT	263	return;
	264	len = p[0] & 0x07;
	265	p += 1;
	266	}
	267	for (i = 0; i < len; i++)
	268	p[i] = 0;
	269	p += len;
	270	}
9dd78466 BH	271	printk(KERN_ERR
9dd78466 BH	272	"PnPBIOS: Resource structure did not contain an end tag.\n");
1da177e4 LT	273	}
	274
	275	static int pnpbios_disable_resources(struct pnp_dev *dev)
	276	{
9dd78466	277	struct pnp_bios_node *node;
1da177e4 LT	278	u8 nodenum = dev->number;
	279	int ret;
	280
9dd78466	281	if (dev->flags & PNPBIOS_NO_DISABLE \|\| !pnpbios_is_dynamic(dev))
1da177e4 LT	282	return -EPERM;
1da177e4 LT	283
cd861280	284	node = kzalloc(node_info.max_node_size, GFP_KERNEL);
1da177e4 LT	285	if (!node)
	286	return -ENOMEM;
	287
9dd78466	288	if (pnp_bios_get_dev_node(&nodenum, (char)PNPMODE_DYNAMIC, node)) {
1da177e4 LT	289	kfree(node);
	290	return -ENODEV;
	291	}
	292	pnpbios_zero_data_stream(node);
	293
	294	ret = pnp_bios_set_dev_node(dev->number, (char)PNPMODE_DYNAMIC, node);
	295	kfree(node);
	296	if (ret > 0)
	297	ret = -1;
	298	return ret;
	299	}
	300
	301	/* PnP Layer support */
	302
	303	struct pnp_protocol pnpbios_protocol = {
9dd78466 BH	304	.name = "Plug and Play BIOS",
	305	.get = pnpbios_get_resources,
	306	.set = pnpbios_set_resources,
1da177e4 LT	307	.disable = pnpbios_disable_resources,
	308	};
	309
2bb9a6b3	310	static int __init insert_device(struct pnp_bios_node *node)
1da177e4	311	{
9dd78466	312	struct list_head *pos;
36405e96	313	struct pnp_dev *dev;
1da177e4 LT	314	char id[8];
	315
	316	/* check if the device is already added */
9dd78466	317	list_for_each(pos, &pnpbios_protocol.devices) {
36405e96 BH	318	dev = list_entry(pos, struct pnp_dev, protocol_list);
36405e96 BH	319	if (dev->number == node->handle)
1da177e4 LT	320	return -1;
	321	}
	322
25eb8461	323	pnp_eisa_id_to_string(node->eisa_id & PNP_EISA_ID_MASK, id);
bda1e4e5 BH	324	dev = pnp_alloc_dev(&pnpbios_protocol, node->handle, id);
bda1e4e5 BH	325	if (!dev)
1da177e4	326	return -1;
36405e96	327
1da177e4 LT	328	pnpbios_parse_data_stream(dev, node);
	329	dev->active = pnp_is_active(dev);
	330	dev->flags = node->flags;
	331	if (!(dev->flags & PNPBIOS_NO_CONFIG))
	332	dev->capabilities \|= PNP_CONFIGURABLE;
3ae19208	333	if (!(dev->flags & PNPBIOS_NO_DISABLE) && pnpbios_is_dynamic(dev))
1da177e4 LT	334	dev->capabilities \|= PNP_DISABLE;
	335	dev->capabilities \|= PNP_READ;
	336	if (pnpbios_is_dynamic(dev))
	337	dev->capabilities \|= PNP_WRITE;
	338	if (dev->flags & PNPBIOS_REMOVABLE)
	339	dev->capabilities \|= PNP_REMOVABLE;
1da177e4 LT	340
	341	/* clear out the damaged flags */
	342	if (!dev->active)
f4490002	343	pnp_init_resources(dev);
1da177e4 LT	344
	345	pnp_add_device(dev);
	346	pnpbios_interface_attach_device(node);
	347
	348	return 0;
	349	}
	350
	351	static void __init build_devlist(void)
	352	{
	353	u8 nodenum;
	354	unsigned int nodes_got = 0;
	355	unsigned int devs = 0;
	356	struct pnp_bios_node *node;
1da177e4	357
cd861280	358	node = kzalloc(node_info.max_node_size, GFP_KERNEL);
1da177e4 LT	359	if (!node)
	360	return;
	361
9dd78466	362	for (nodenum = 0; nodenum < 0xff;) {
1da177e4 LT	363	u8 thisnodenum = nodenum;
	364	/* eventually we will want to use PNPMODE_STATIC here but for now
	365	* dynamic will help us catch buggy bioses to add to the blacklist.
	366	*/
	367	if (!pnpbios_dont_use_current_config) {
9dd78466 BH	368	if (pnp_bios_get_dev_node
9dd78466 BH	369	(&nodenum, (char)PNPMODE_DYNAMIC, node))
1da177e4 LT	370	break;
1da177e4 LT	371	} else {
9dd78466 BH	372	if (pnp_bios_get_dev_node
9dd78466 BH	373	(&nodenum, (char)PNPMODE_STATIC, node))
1da177e4 LT	374	break;
	375	}
	376	nodes_got++;
36405e96	377	if (insert_device(node) == 0)
1da177e4 LT	378	devs++;
1da177e4 LT	379	if (nodenum <= thisnodenum) {
9dd78466 BH	380	printk(KERN_ERR
	381	"PnPBIOS: build_devlist: Node number 0x%x is out of sequence following node 0x%x. Aborting.\n",
	382	(unsigned int)nodenum,
	383	(unsigned int)thisnodenum);
1da177e4 LT	384	break;
	385	}
	386	}
	387	kfree(node);
	388
9dd78466 BH	389	printk(KERN_INFO
	390	"PnPBIOS: %i node%s reported by PnP BIOS; %i recorded by driver\n",
	391	nodes_got, nodes_got != 1 ? "s" : "", devs);
1da177e4 LT	392	}
	393
	394	/*
	395	*
	396	* INIT AND EXIT
	397	*
	398	*/
	399
07d4e9af BH	400	static int pnpbios_disabled;
07d4e9af BH	401	int pnpbios_dont_use_current_config;
1da177e4	402
1da177e4 LT	403	static int __init pnpbios_setup(char *str)
	404	{
	405	int invert;
	406
	407	while ((str != NULL) && (*str != '\0')) {
	408	if (strncmp(str, "off", 3) == 0)
9dd78466	409	pnpbios_disabled = 1;
1da177e4	410	if (strncmp(str, "on", 2) == 0)
9dd78466	411	pnpbios_disabled = 0;
1da177e4 LT	412	invert = (strncmp(str, "no-", 3) == 0);
	413	if (invert)
	414	str += 3;
	415	if (strncmp(str, "curr", 4) == 0)
	416	pnpbios_dont_use_current_config = invert;
	417	str = strchr(str, ',');
	418	if (str != NULL)
	419	str += strspn(str, ", \t");
	420	}
	421
	422	return 1;
	423	}
	424
	425	__setup("pnpbios=", pnpbios_setup);
1da177e4 LT	426
	427	/* PnP BIOS signature: "$PnP" */
	428	#define PNP_SIGNATURE (('$' << 0) + ('P' << 8) + ('n' << 16) + ('P' << 24))
	429
	430	static int __init pnpbios_probe_system(void)
	431	{
	432	union pnp_bios_install_struct *check;
	433	u8 sum;
	434	int length, i;
	435
	436	printk(KERN_INFO "PnPBIOS: Scanning system for PnP BIOS support...\n");
	437
	438	/*
9dd78466	439	* Search the defined area (0xf0000-0xffff0) for a valid PnP BIOS
1da177e4 LT	440	* structure and, if one is found, sets up the selectors and
	441	* entry points
	442	*/
9dd78466 BH	443	for (check = (union pnp_bios_install_struct *)__va(0xf0000);
9dd78466 BH	444	check < (union pnp_bios_install_struct *)__va(0xffff0);
1da177e4 LT	445	check = (void *)check + 16) {
	446	if (check->fields.signature != PNP_SIGNATURE)
	447	continue;
9dd78466 BH	448	printk(KERN_INFO
	449	"PnPBIOS: Found PnP BIOS installation structure at 0x%p\n",
	450	check);
1da177e4 LT	451	length = check->fields.length;
1da177e4 LT	452	if (!length) {
9dd78466 BH	453	printk(KERN_ERR
9dd78466 BH	454	"PnPBIOS: installation structure is invalid, skipping\n");
1da177e4 LT	455	continue;
	456	}
	457	for (sum = 0, i = 0; i < length; i++)
	458	sum += check->chars[i];
	459	if (sum) {
9dd78466 BH	460	printk(KERN_ERR
9dd78466 BH	461	"PnPBIOS: installation structure is corrupted, skipping\n");
1da177e4 LT	462	continue;
	463	}
	464	if (check->fields.version < 0x10) {
9dd78466 BH	465	printk(KERN_WARNING
9dd78466 BH	466	"PnPBIOS: PnP BIOS version %d.%d is not supported\n",
1da177e4 LT	467	check->fields.version >> 4,
	468	check->fields.version & 15);
	469	continue;
	470	}
9dd78466 BH	471	printk(KERN_INFO
	472	"PnPBIOS: PnP BIOS version %d.%d, entry 0x%x:0x%x, dseg 0x%x\n",
	473	check->fields.version >> 4, check->fields.version & 15,
1da177e4 LT	474	check->fields.pm16cseg, check->fields.pm16offset,
	475	check->fields.pm16dseg);
	476	pnp_bios_install = check;
	477	return 1;
	478	}
	479
	480	printk(KERN_INFO "PnPBIOS: PnP BIOS support was not detected.\n");
	481	return 0;
	482	}
	483
1855256c	484	static int __init exploding_pnp_bios(const struct dmi_system_id *d)
1da177e4 LT	485	{
	486	printk(KERN_WARNING "%s detected. Disabling PnPBIOS\n", d->ident);
	487	return 0;
	488	}
	489
ffbe5523	490	static struct dmi_system_id pnpbios_dmi_table[] __initdata = {
9dd78466 BH	491	{ /* PnPBIOS GPF on boot */
	492	.callback = exploding_pnp_bios,
	493	.ident = "Higraded P14H",
	494	.matches = {
	495	DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
	496	DMI_MATCH(DMI_BIOS_VERSION, "07.00T"),
	497	DMI_MATCH(DMI_SYS_VENDOR, "Higraded"),
	498	DMI_MATCH(DMI_PRODUCT_NAME, "P14H"),
	499	},
	500	},
	501	{ /* PnPBIOS GPF on boot */
	502	.callback = exploding_pnp_bios,
	503	.ident = "ASUS P4P800",
	504	.matches = {
	505	DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer Inc."),
	506	DMI_MATCH(DMI_BOARD_NAME, "P4P800"),
	507	},
	508	},
	509	{}
1da177e4 LT	510	};
	511
	512	static int __init pnpbios_init(void)
	513	{
	514	int ret;
	515
6020c8f3 RR	516	if (pnpbios_disabled \|\| dmi_check_system(pnpbios_dmi_table) \|\|
6020c8f3 RR	517	paravirt_enabled()) {
1da177e4 LT	518	printk(KERN_INFO "PnPBIOS: Disabled\n");
	519	return -ENODEV;
	520	}
1da177e4 LT	521	#ifdef CONFIG_PNPACPI
	522	if (!acpi_disabled && !pnpacpi_disabled) {
	523	pnpbios_disabled = 1;
	524	printk(KERN_INFO "PnPBIOS: Disabled by ACPI PNP\n");
	525	return -ENODEV;
	526	}
07d4e9af	527	#endif /* CONFIG_ACPI */
1da177e4 LT	528
	529	/* scan the system for pnpbios support */
	530	if (!pnpbios_probe_system())
	531	return -ENODEV;
	532
	533	/* make preparations for bios calls */
	534	pnpbios_calls_init(pnp_bios_install);
	535
	536	/* read the node info */
	537	ret = pnp_bios_dev_node_info(&node_info);
	538	if (ret) {
9dd78466 BH	539	printk(KERN_ERR
9dd78466 BH	540	"PnPBIOS: Unable to get node info. Aborting.\n");
1da177e4 LT	541	return ret;
	542	}
	543
	544	/* register with the pnp layer */
	545	ret = pnp_register_protocol(&pnpbios_protocol);
	546	if (ret) {
9dd78466 BH	547	printk(KERN_ERR
9dd78466 BH	548	"PnPBIOS: Unable to register driver. Aborting.\n");
1da177e4 LT	549	return ret;
	550	}
	551
	552	/* start the proc interface */
	553	ret = pnpbios_proc_init();
	554	if (ret)
	555	printk(KERN_ERR "PnPBIOS: Failed to create proc interface.\n");
	556
	557	/* scan for pnpbios devices */
	558	build_devlist();
	559
8f81dd14	560	pnp_platform_devices = 1;
1da177e4 LT	561	return 0;
	562	}
	563
ed458df4	564	fs_initcall(pnpbios_init);
1da177e4 LT	565
	566	static int __init pnpbios_thread_init(void)
	567	{
38de2790	568	struct task_struct *task;
933ee711	569
1da177e4 LT	570	if (pnpbios_disabled)
1da177e4 LT	571	return 0;
38de2790 BP	572
	573	init_completion(&unload_sem);
	574	task = kthread_run(pnp_dock_thread, NULL, "kpnpbiosd");
	575	if (IS_ERR(task))
	576	return PTR_ERR(task);
	577
1da177e4 LT	578	return 0;
	579	}
	580
1da177e4 LT	581	/* Start the kernel thread later: */
	582	module_init(pnpbios_thread_init);
	583
1da177e4	584	EXPORT_SYMBOL(pnpbios_protocol);