Release 4.7 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);
}

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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;
}

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al viro
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rusty russell
rusty russell
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robert p. j. day
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1
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jeremy fitzhardinge
jeremy fitzhardinge
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/*
 * 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);
			printk(KERN_WARNING "PnPBIOS: disabling dock monitoring.\n");
			complete_and_exit(&unload_sem, 0);
		}
		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);
}

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dave jones
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pavel machek
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rafael j. wysocki
rafael j. wysocki
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nishanth aravamudan
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bjorn helgaas
1
0.65%
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erik ekman
erik ekman
1
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adam belay
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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;
}

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robert p. j. day
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1
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jaroslav kysela
jaroslav kysela
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1
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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;
}

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bjorn helgaas
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23.08%
dave jones
dave jones
7
4.64%
1
7.69%
art haas
art haas
2
1.32%
1
7.69%
jaroslav kysela
jaroslav kysela
1
0.66%
1
7.69%
robert p. j. day
robert p. j. day
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1
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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");
}

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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;
}

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jaroslav kysela
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/* 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];
	int error;

	/* 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 -EEXIST;
	}

	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 -ENOMEM;

	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);

	error = pnp_add_device(dev);
	if (error) {
		put_device(&dev->dev);
		return error;
	}

	pnpbios_interface_attach_device(node);

	return 0;
}

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dmitry torokhov
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1
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linus torvalds
linus torvalds
22
9.13%
1
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ondrej zary
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5
2.07%
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thomas renninger
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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);
}

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1
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bjorn helgaas
1
0.58%
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robert p. j. day
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1
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/*
 *
 * 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;
}

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__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;
}

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

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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) ||
	    arch_pnpbios_disabled()) {
		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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
adam belay
adam belay
94
59.49%
9
47.37%
linus torvalds
linus torvalds
23
14.56%
1
5.26%
dave jones
dave jones
20
12.66%
1
5.26%
len brown
len brown
5
3.16%
1
5.26%
andrey panin
andrey panin
4
2.53%
1
5.26%
bjorn helgaas
bjorn helgaas
4
2.53%
1
5.26%
kai germaschewski
kai germaschewski
3
1.90%
1
5.26%
rusty russell
rusty russell
2
1.27%
1
5.26%
alan cox
alan cox
1
0.63%
1
5.26%
luis r. rodriguez
luis r. rodriguez
1
0.63%
1
5.26%
adrian bunk
adrian bunk
1
0.63%
1
5.26%
Total
158
100.00%
19
100.00%


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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
linus torvalds
linus torvalds
14
25.93%
1
14.29%
eric w. biederman
eric w. biederman
11
20.37%
1
14.29%
dave jones
dave jones
8
14.81%
1
14.29%
len brown
len brown
7
12.96%
1
14.29%
erik ekman
erik ekman
6
11.11%
1
14.29%
bill pemberton
bill pemberton
5
9.26%
1
14.29%
kai germaschewski
kai germaschewski
3
5.56%
1
14.29%
Total
54
100.00%
7
100.00%

/* Start the kernel thread later: */

module_init(pnpbios_thread_init);


EXPORT_SYMBOL(pnpbios_protocol);
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
adam belay
adam belay
1156
51.98%
15
21.74%
linus torvalds
linus torvalds
613
27.56%
2
2.90%
andrey panin
andrey panin
115
5.17%
1
1.45%
jaroslav kysela
jaroslav kysela
79
3.55%
3
4.35%
bjorn helgaas
bjorn helgaas
67
3.01%
13
18.84%
dave jones
dave jones
49
2.20%
4
5.80%
dmitry torokhov
dmitry torokhov
24
1.08%
1
1.45%
alan cox
alan cox
15
0.67%
2
2.90%
eric w. biederman
eric w. biederman
14
0.63%
1
1.45%
andrew morton
andrew morton
13
0.58%
3
4.35%
len brown
len brown
12
0.54%
2
2.90%
art haas
art haas
10
0.45%
1
1.45%
erik ekman
erik ekman
7
0.31%
1
1.45%
kai germaschewski
kai germaschewski
6
0.27%
1
1.45%
nishanth aravamudan
nishanth aravamudan
5
0.22%
1
1.45%
bill pemberton
bill pemberton
5
0.22%
1
1.45%
ondrej zary
ondrej zary
5
0.22%
1
1.45%
robert p. j. day
robert p. j. day
5
0.22%
1
1.45%
rusty russell
rusty russell
3
0.13%
2
2.90%
nigel cunningham
nigel cunningham
3
0.13%
1
1.45%
adrian bunk
adrian bunk
3
0.13%
2
2.90%
pavel machek
pavel machek
3
0.13%
1
1.45%
rafael j. wysocki
rafael j. wysocki
3
0.13%
1
1.45%
al viro
al viro
2
0.09%
1
1.45%
maximilian attems
maximilian attems
1
0.04%
1
1.45%
christoph lameter
christoph lameter
1
0.04%
1
1.45%
thomas renninger
thomas renninger
1
0.04%
1
1.45%
jeremy fitzhardinge
jeremy fitzhardinge
1
0.04%
1
1.45%
kay sievers
kay sievers
1
0.04%
1
1.45%
luis r. rodriguez
luis r. rodriguez
1
0.04%
1
1.45%
jeff garzik
jeff garzik
1
0.04%
1
1.45%
Total
2224
100.00%
69
100.00%
  
Directory: drivers/pnp/pnpbios

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