576 lines
13 KiB
C
576 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* 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>
|
|
*/
|
|
|
|
/* 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/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/kmod.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)
|
|
{
|
|
static char const sbin_pnpbios[] = "/sbin/pnpbios";
|
|
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] = (char *)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(sbin_pnpbios, 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:
|
|
kthread_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");
|
|
kthread_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
|
|
}
|
|
}
|
|
}
|
|
kthread_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 pnp_dev *dev;
|
|
char id[8];
|
|
int error;
|
|
|
|
/* check if the device is already added */
|
|
list_for_each_entry(dev, &pnpbios_protocol.devices, 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;
|
|
}
|
|
|
|
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 const struct dmi_system_id pnpbios_dmi_table[] __initconst = {
|
|
{ /* 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;
|
|
}
|
|
|
|
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");
|
|
return PTR_ERR_OR_ZERO(task);
|
|
}
|
|
|
|
/* Start the kernel thread later: */
|
|
device_initcall(pnpbios_thread_init);
|
|
|
|
EXPORT_SYMBOL(pnpbios_protocol);
|