[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
 *
 */

#ifdef CONFIG_HOTPLUG

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);
}

#endif				/* CONFIG_HOTPLUG */

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 defined(CONFIG_PPC)
	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;
}

fs_initcall(pnpbios_init);

static int __init pnpbios_thread_init(void)
{
#if defined(CONFIG_PPC)
	if (check_legacy_ioport(PNPBIOS_BASE))
		return 0;
#endif
	if (pnpbios_disabled)
		return 0;
#ifdef CONFIG_HOTPLUG
	{
		struct task_struct *task;
		init_completion(&unload_sem);
		task = kthread_run(pnp_dock_thread, NULL, "kpnpbiosd");
		if (IS_ERR(task))
			return PTR_ERR(task);
	}
#endif
	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
	94	#ifdef CONFIG_HOTPLUG
	95
1da177e4 LT	96	static struct completion unload_sem;
	97
	98	/*
	99	* (Much of this belongs in a shared routine somewhere)
	100	*/
1da177e4 LT	101	static int pnp_dock_event(int dock, struct pnp_docking_station_info *info)
1da177e4 LT	102	{
9dd78466	103	char argv[3], envp, buf, *scratch;
1da177e4 LT	104	int i = 0, value;
1da177e4 LT	105
07d4e9af	106	if (!(envp = kcalloc(20, sizeof(char *), GFP_KERNEL)))
1da177e4	107	return -ENOMEM;
cd861280	108	if (!(buf = kzalloc(256, GFP_KERNEL))) {
9dd78466	109	kfree(envp);
1da177e4 LT	110	return -ENOMEM;
	111	}
	112
07d4e9af BH	113	/* FIXME: if there are actual users of this, it should be
	114	* integrated into the driver core and use the usual infrastructure
	115	* like sysfs and uevents
	116	*/
9dd78466 BH	117	argv[0] = "/sbin/pnpbios";
	118	argv[1] = "dock";
	119	argv[2] = NULL;
1da177e4 LT	120
1da177e4 LT	121	/* minimal command environment */
9dd78466 BH	122	envp[i++] = "HOME=/";
9dd78466 BH	123	envp[i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
1da177e4 LT	124
	125	#ifdef DEBUG
	126	/* hint that policy agent should enter no-stdout debug mode */
9dd78466	127	envp[i++] = "DEBUG=kernel";
1da177e4 LT	128	#endif
	129	/* extensible set of named bus-specific parameters,
	130	* supporting multiple driver selection algorithms.
	131	*/
	132	scratch = buf;
	133
	134	/* action: add, remove */
9dd78466 BH	135	envp[i++] = scratch;
9dd78466 BH	136	scratch += sprintf(scratch, "ACTION=%s", dock ? "add" : "remove") + 1;
1da177e4 LT	137
1da177e4 LT	138	/* Report the ident for the dock */
9dd78466 BH	139	envp[i++] = scratch;
	140	scratch += sprintf(scratch, "DOCK=%x/%x/%x",
	141	info->location_id, info->serial, info->capabilities);
1da177e4	142	envp[i] = NULL;
9dd78466	143
07d4e9af	144	value = call_usermodehelper(argv [0], argv, envp, UMH_WAIT_EXEC);
9dd78466 BH	145	kfree(buf);
9dd78466 BH	146	kfree(envp);
1da177e4 LT	147	return 0;
	148	}
	149
	150	/*
	151	* Poll the PnP docking at regular intervals
	152	*/
9dd78466	153	static int pnp_dock_thread(void *unused)
1da177e4 LT	154	{
	155	static struct pnp_docking_station_info now;
	156	int docked = -1, d = 0;
07d4e9af	157
83144186	158	set_freezable();
b277c884	159	while (1) {
1da177e4	160	int status;
9dd78466	161
1da177e4 LT	162	/*
	163	* Poll every 2 seconds
	164	*/
	165	msleep_interruptible(2000);
	166
db9c02fa EB	167	if (try_to_freeze())
db9c02fa EB	168	continue;
1da177e4 LT	169
	170	status = pnp_bios_dock_station_info(&now);
	171
9dd78466	172	switch (status) {
1da177e4 LT	173	/*
	174	* No dock to manage
	175	*/
9dd78466 BH	176	case PNP_FUNCTION_NOT_SUPPORTED:
	177	complete_and_exit(&unload_sem, 0);
	178	case PNP_SYSTEM_NOT_DOCKED:
	179	d = 0;
	180	break;
	181	case PNP_SUCCESS:
	182	d = 1;
	183	break;
	184	default:
	185	pnpbios_print_status("pnp_dock_thread", status);
	186	continue;
1da177e4	187	}
9dd78466 BH	188	if (d != docked) {
9dd78466 BH	189	if (pnp_dock_event(d, &now) == 0) {
1da177e4 LT	190	docked = d;
1da177e4 LT	191	#if 0
9dd78466 BH	192	printk(KERN_INFO
	193	"PnPBIOS: Docking station %stached\n",
	194	docked ? "at" : "de");
1da177e4 LT	195	#endif
	196	}
	197	}
	198	}
	199	complete_and_exit(&unload_sem, 0);
	200	}
	201
07d4e9af	202	#endif /* CONFIG_HOTPLUG */
1da177e4	203
59284cb4	204	static int pnpbios_get_resources(struct pnp_dev *dev)
1da177e4 LT	205	{
1da177e4 LT	206	u8 nodenum = dev->number;
9dd78466	207	struct pnp_bios_node *node;
1da177e4	208
9dd78466	209	if (!pnpbios_is_dynamic(dev))
1da177e4 LT	210	return -EPERM;
1da177e4 LT	211
2f53432c	212	pnp_dbg(&dev->dev, "get resources\n");
cd861280	213	node = kzalloc(node_info.max_node_size, GFP_KERNEL);
1da177e4 LT	214	if (!node)
1da177e4 LT	215	return -1;
9dd78466	216	if (pnp_bios_get_dev_node(&nodenum, (char)PNPMODE_DYNAMIC, node)) {
1da177e4 LT	217	kfree(node);
	218	return -ENODEV;
	219	}
4ab55d8d	220	pnpbios_read_resources_from_node(dev, node);
1da177e4 LT	221	dev->active = pnp_is_active(dev);
	222	kfree(node);
	223	return 0;
	224	}
	225
59284cb4	226	static int pnpbios_set_resources(struct pnp_dev *dev)
1da177e4 LT	227	{
1da177e4 LT	228	u8 nodenum = dev->number;
9dd78466	229	struct pnp_bios_node *node;
1da177e4 LT	230	int ret;
1da177e4 LT	231
1da177e4 LT	232	if (!pnpbios_is_dynamic(dev))
	233	return -EPERM;
	234
2f53432c	235	pnp_dbg(&dev->dev, "set resources\n");
cd861280	236	node = kzalloc(node_info.max_node_size, GFP_KERNEL);
1da177e4 LT	237	if (!node)
1da177e4 LT	238	return -1;
9dd78466	239	if (pnp_bios_get_dev_node(&nodenum, (char)PNPMODE_DYNAMIC, node)) {
1da177e4 LT	240	kfree(node);
	241	return -ENODEV;
	242	}
4ab55d8d	243	if (pnpbios_write_resources_to_node(dev, node) < 0) {
1da177e4 LT	244	kfree(node);
	245	return -1;
	246	}
	247	ret = pnp_bios_set_dev_node(node->handle, (char)PNPMODE_DYNAMIC, node);
	248	kfree(node);
	249	if (ret > 0)
	250	ret = -1;
	251	return ret;
	252	}
	253
9dd78466	254	static void pnpbios_zero_data_stream(struct pnp_bios_node *node)
1da177e4	255	{
9dd78466 BH	256	unsigned char p = (char )node->data;
9dd78466 BH	257	unsigned char end = (char )(node->data + node->size);
1da177e4 LT	258	unsigned int len;
1da177e4 LT	259	int i;
07d4e9af	260
1da177e4	261	while ((char )p < (char )end) {
9dd78466	262	if (p[0] & 0x80) { /* large tag */
1da177e4 LT	263	len = (p[2] << 8) \| p[1];
	264	p += 3;
	265	} else {
9dd78466	266	if (((p[0] >> 3) & 0x0f) == 0x0f)
1da177e4 LT	267	return;
	268	len = p[0] & 0x07;
	269	p += 1;
	270	}
	271	for (i = 0; i < len; i++)
	272	p[i] = 0;
	273	p += len;
	274	}
9dd78466 BH	275	printk(KERN_ERR
9dd78466 BH	276	"PnPBIOS: Resource structure did not contain an end tag.\n");
1da177e4 LT	277	}
	278
	279	static int pnpbios_disable_resources(struct pnp_dev *dev)
	280	{
9dd78466	281	struct pnp_bios_node *node;
1da177e4 LT	282	u8 nodenum = dev->number;
	283	int ret;
	284
9dd78466	285	if (dev->flags & PNPBIOS_NO_DISABLE \|\| !pnpbios_is_dynamic(dev))
1da177e4 LT	286	return -EPERM;
1da177e4 LT	287
cd861280	288	node = kzalloc(node_info.max_node_size, GFP_KERNEL);
1da177e4 LT	289	if (!node)
	290	return -ENOMEM;
	291
9dd78466	292	if (pnp_bios_get_dev_node(&nodenum, (char)PNPMODE_DYNAMIC, node)) {
1da177e4 LT	293	kfree(node);
	294	return -ENODEV;
	295	}
	296	pnpbios_zero_data_stream(node);
	297
	298	ret = pnp_bios_set_dev_node(dev->number, (char)PNPMODE_DYNAMIC, node);
	299	kfree(node);
	300	if (ret > 0)
	301	ret = -1;
	302	return ret;
	303	}
	304
	305	/* PnP Layer support */
	306
	307	struct pnp_protocol pnpbios_protocol = {
9dd78466 BH	308	.name = "Plug and Play BIOS",
	309	.get = pnpbios_get_resources,
	310	.set = pnpbios_set_resources,
1da177e4 LT	311	.disable = pnpbios_disable_resources,
	312	};
	313
2bb9a6b3	314	static int __init insert_device(struct pnp_bios_node *node)
1da177e4	315	{
9dd78466	316	struct list_head *pos;
36405e96	317	struct pnp_dev *dev;
1da177e4 LT	318	char id[8];
	319
	320	/* check if the device is already added */
9dd78466	321	list_for_each(pos, &pnpbios_protocol.devices) {
36405e96 BH	322	dev = list_entry(pos, struct pnp_dev, protocol_list);
36405e96 BH	323	if (dev->number == node->handle)
1da177e4 LT	324	return -1;
	325	}
	326
25eb8461	327	pnp_eisa_id_to_string(node->eisa_id & PNP_EISA_ID_MASK, id);
bda1e4e5 BH	328	dev = pnp_alloc_dev(&pnpbios_protocol, node->handle, id);
bda1e4e5 BH	329	if (!dev)
1da177e4	330	return -1;
36405e96	331
1da177e4 LT	332	pnpbios_parse_data_stream(dev, node);
	333	dev->active = pnp_is_active(dev);
	334	dev->flags = node->flags;
	335	if (!(dev->flags & PNPBIOS_NO_CONFIG))
	336	dev->capabilities \|= PNP_CONFIGURABLE;
3ae19208	337	if (!(dev->flags & PNPBIOS_NO_DISABLE) && pnpbios_is_dynamic(dev))
1da177e4 LT	338	dev->capabilities \|= PNP_DISABLE;
	339	dev->capabilities \|= PNP_READ;
	340	if (pnpbios_is_dynamic(dev))
	341	dev->capabilities \|= PNP_WRITE;
	342	if (dev->flags & PNPBIOS_REMOVABLE)
	343	dev->capabilities \|= PNP_REMOVABLE;
1da177e4 LT	344
	345	/* clear out the damaged flags */
	346	if (!dev->active)
f4490002	347	pnp_init_resources(dev);
1da177e4 LT	348
	349	pnp_add_device(dev);
	350	pnpbios_interface_attach_device(node);
	351
	352	return 0;
	353	}
	354
	355	static void __init build_devlist(void)
	356	{
	357	u8 nodenum;
	358	unsigned int nodes_got = 0;
	359	unsigned int devs = 0;
	360	struct pnp_bios_node *node;
1da177e4	361
cd861280	362	node = kzalloc(node_info.max_node_size, GFP_KERNEL);
1da177e4 LT	363	if (!node)
	364	return;
	365
9dd78466	366	for (nodenum = 0; nodenum < 0xff;) {
1da177e4 LT	367	u8 thisnodenum = nodenum;
	368	/* eventually we will want to use PNPMODE_STATIC here but for now
	369	* dynamic will help us catch buggy bioses to add to the blacklist.
	370	*/
	371	if (!pnpbios_dont_use_current_config) {
9dd78466 BH	372	if (pnp_bios_get_dev_node
9dd78466 BH	373	(&nodenum, (char)PNPMODE_DYNAMIC, node))
1da177e4 LT	374	break;
1da177e4 LT	375	} else {
9dd78466 BH	376	if (pnp_bios_get_dev_node
9dd78466 BH	377	(&nodenum, (char)PNPMODE_STATIC, node))
1da177e4 LT	378	break;
	379	}
	380	nodes_got++;
36405e96	381	if (insert_device(node) == 0)
1da177e4 LT	382	devs++;
1da177e4 LT	383	if (nodenum <= thisnodenum) {
9dd78466 BH	384	printk(KERN_ERR
	385	"PnPBIOS: build_devlist: Node number 0x%x is out of sequence following node 0x%x. Aborting.\n",
	386	(unsigned int)nodenum,
	387	(unsigned int)thisnodenum);
1da177e4 LT	388	break;
	389	}
	390	}
	391	kfree(node);
	392
9dd78466 BH	393	printk(KERN_INFO
	394	"PnPBIOS: %i node%s reported by PnP BIOS; %i recorded by driver\n",
	395	nodes_got, nodes_got != 1 ? "s" : "", devs);
1da177e4 LT	396	}
	397
	398	/*
	399	*
	400	* INIT AND EXIT
	401	*
	402	*/
	403
07d4e9af BH	404	static int pnpbios_disabled;
07d4e9af BH	405	int pnpbios_dont_use_current_config;
1da177e4	406
1da177e4 LT	407	static int __init pnpbios_setup(char *str)
	408	{
	409	int invert;
	410
	411	while ((str != NULL) && (*str != '\0')) {
	412	if (strncmp(str, "off", 3) == 0)
9dd78466	413	pnpbios_disabled = 1;
1da177e4	414	if (strncmp(str, "on", 2) == 0)
9dd78466	415	pnpbios_disabled = 0;
1da177e4 LT	416	invert = (strncmp(str, "no-", 3) == 0);
	417	if (invert)
	418	str += 3;
	419	if (strncmp(str, "curr", 4) == 0)
	420	pnpbios_dont_use_current_config = invert;
	421	str = strchr(str, ',');
	422	if (str != NULL)
	423	str += strspn(str, ", \t");
	424	}
	425
	426	return 1;
	427	}
	428
	429	__setup("pnpbios=", pnpbios_setup);
1da177e4 LT	430
	431	/* PnP BIOS signature: "$PnP" */
	432	#define PNP_SIGNATURE (('$' << 0) + ('P' << 8) + ('n' << 16) + ('P' << 24))
	433
	434	static int __init pnpbios_probe_system(void)
	435	{
	436	union pnp_bios_install_struct *check;
	437	u8 sum;
	438	int length, i;
	439
	440	printk(KERN_INFO "PnPBIOS: Scanning system for PnP BIOS support...\n");
	441
	442	/*
9dd78466	443	* Search the defined area (0xf0000-0xffff0) for a valid PnP BIOS
1da177e4 LT	444	* structure and, if one is found, sets up the selectors and
	445	* entry points
	446	*/
9dd78466 BH	447	for (check = (union pnp_bios_install_struct *)__va(0xf0000);
9dd78466 BH	448	check < (union pnp_bios_install_struct *)__va(0xffff0);
1da177e4 LT	449	check = (void *)check + 16) {
	450	if (check->fields.signature != PNP_SIGNATURE)
	451	continue;
9dd78466 BH	452	printk(KERN_INFO
	453	"PnPBIOS: Found PnP BIOS installation structure at 0x%p\n",
	454	check);
1da177e4 LT	455	length = check->fields.length;
1da177e4 LT	456	if (!length) {
9dd78466 BH	457	printk(KERN_ERR
9dd78466 BH	458	"PnPBIOS: installation structure is invalid, skipping\n");
1da177e4 LT	459	continue;
	460	}
	461	for (sum = 0, i = 0; i < length; i++)
	462	sum += check->chars[i];
	463	if (sum) {
9dd78466 BH	464	printk(KERN_ERR
9dd78466 BH	465	"PnPBIOS: installation structure is corrupted, skipping\n");
1da177e4 LT	466	continue;
	467	}
	468	if (check->fields.version < 0x10) {
9dd78466 BH	469	printk(KERN_WARNING
9dd78466 BH	470	"PnPBIOS: PnP BIOS version %d.%d is not supported\n",
1da177e4 LT	471	check->fields.version >> 4,
	472	check->fields.version & 15);
	473	continue;
	474	}
9dd78466 BH	475	printk(KERN_INFO
	476	"PnPBIOS: PnP BIOS version %d.%d, entry 0x%x:0x%x, dseg 0x%x\n",
	477	check->fields.version >> 4, check->fields.version & 15,
1da177e4 LT	478	check->fields.pm16cseg, check->fields.pm16offset,
	479	check->fields.pm16dseg);
	480	pnp_bios_install = check;
	481	return 1;
	482	}
	483
	484	printk(KERN_INFO "PnPBIOS: PnP BIOS support was not detected.\n");
	485	return 0;
	486	}
	487
1855256c	488	static int __init exploding_pnp_bios(const struct dmi_system_id *d)
1da177e4 LT	489	{
	490	printk(KERN_WARNING "%s detected. Disabling PnPBIOS\n", d->ident);
	491	return 0;
	492	}
	493
ffbe5523	494	static struct dmi_system_id pnpbios_dmi_table[] __initdata = {
9dd78466 BH	495	{ /* PnPBIOS GPF on boot */
	496	.callback = exploding_pnp_bios,
	497	.ident = "Higraded P14H",
	498	.matches = {
	499	DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
	500	DMI_MATCH(DMI_BIOS_VERSION, "07.00T"),
	501	DMI_MATCH(DMI_SYS_VENDOR, "Higraded"),
	502	DMI_MATCH(DMI_PRODUCT_NAME, "P14H"),
	503	},
	504	},
	505	{ /* PnPBIOS GPF on boot */
	506	.callback = exploding_pnp_bios,
	507	.ident = "ASUS P4P800",
	508	.matches = {
	509	DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer Inc."),
	510	DMI_MATCH(DMI_BOARD_NAME, "P4P800"),
	511	},
	512	},
	513	{}
1da177e4 LT	514	};
	515
	516	static int __init pnpbios_init(void)
	517	{
	518	int ret;
	519
68e1ee62	520	#if defined(CONFIG_PPC)
30cbc222 OH	521	if (check_legacy_ioport(PNPBIOS_BASE))
	522	return -ENODEV;
	523	#endif
6020c8f3 RR	524	if (pnpbios_disabled \|\| dmi_check_system(pnpbios_dmi_table) \|\|
6020c8f3 RR	525	paravirt_enabled()) {
1da177e4 LT	526	printk(KERN_INFO "PnPBIOS: Disabled\n");
	527	return -ENODEV;
	528	}
1da177e4 LT	529	#ifdef CONFIG_PNPACPI
	530	if (!acpi_disabled && !pnpacpi_disabled) {
	531	pnpbios_disabled = 1;
	532	printk(KERN_INFO "PnPBIOS: Disabled by ACPI PNP\n");
	533	return -ENODEV;
	534	}
07d4e9af	535	#endif /* CONFIG_ACPI */
1da177e4 LT	536
	537	/* scan the system for pnpbios support */
	538	if (!pnpbios_probe_system())
	539	return -ENODEV;
	540
	541	/* make preparations for bios calls */
	542	pnpbios_calls_init(pnp_bios_install);
	543
	544	/* read the node info */
	545	ret = pnp_bios_dev_node_info(&node_info);
	546	if (ret) {
9dd78466 BH	547	printk(KERN_ERR
9dd78466 BH	548	"PnPBIOS: Unable to get node info. Aborting.\n");
1da177e4 LT	549	return ret;
	550	}
	551
	552	/* register with the pnp layer */
	553	ret = pnp_register_protocol(&pnpbios_protocol);
	554	if (ret) {
9dd78466 BH	555	printk(KERN_ERR
9dd78466 BH	556	"PnPBIOS: Unable to register driver. Aborting.\n");
1da177e4 LT	557	return ret;
	558	}
	559
	560	/* start the proc interface */
	561	ret = pnpbios_proc_init();
	562	if (ret)
	563	printk(KERN_ERR "PnPBIOS: Failed to create proc interface.\n");
	564
	565	/* scan for pnpbios devices */
	566	build_devlist();
	567
8f81dd14	568	pnp_platform_devices = 1;
1da177e4 LT	569	return 0;
	570	}
	571
ed458df4	572	fs_initcall(pnpbios_init);
1da177e4 LT	573
	574	static int __init pnpbios_thread_init(void)
	575	{
68e1ee62	576	#if defined(CONFIG_PPC)
30cbc222 OH	577	if (check_legacy_ioport(PNPBIOS_BASE))
	578	return 0;
	579	#endif
1da177e4 LT	580	if (pnpbios_disabled)
	581	return 0;
	582	#ifdef CONFIG_HOTPLUG
8c655918 EE	583	{
	584	struct task_struct *task;
	585	init_completion(&unload_sem);
	586	task = kthread_run(pnp_dock_thread, NULL, "kpnpbiosd");
b277c884 EE	587	if (IS_ERR(task))
b277c884 EE	588	return PTR_ERR(task);
8c655918	589	}
1da177e4 LT	590	#endif
	591	return 0;
	592	}
	593
1da177e4 LT	594	/* Start the kernel thread later: */
	595	module_init(pnpbios_thread_init);
	596
1da177e4	597	EXPORT_SYMBOL(pnpbios_protocol);