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575 lines
13 KiB
575 lines
13 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* pnpbios -- PnP BIOS driver |
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* |
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* This driver provides access to Plug-'n'-Play services provided by |
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* the PnP BIOS firmware, described in the following documents: |
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* Plug and Play BIOS Specification, Version 1.0A, 5 May 1994 |
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* Plug and Play BIOS Clarification Paper, 6 October 1994 |
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* Compaq Computer Corporation, Phoenix Technologies Ltd., Intel Corp. |
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* |
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* Originally (C) 1998 Christian Schmidt <[email protected]> |
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* Modifications (C) 1998 Tom Lees <[email protected]> |
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* Minor reorganizations by David Hinds <[email protected]> |
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* Further modifications (C) 2001, 2002 by: |
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* Alan Cox <[email protected]> |
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* Thomas Hood |
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* Brian Gerst <[email protected]> |
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* |
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* Ported to the PnP Layer and several additional improvements (C) 2002 |
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* by Adam Belay <[email protected]> |
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*/ |
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|
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/* Change Log |
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* |
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* Adam Belay - <[email protected]> - March 16, 2003 |
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* rev 1.01 Only call pnp_bios_dev_node_info once |
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* Added pnpbios_print_status |
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* Added several new error messages and info messages |
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* Added pnpbios_interface_attach_device |
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* integrated core and proc init system |
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* Introduced PNPMODE flags |
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* Removed some useless includes |
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*/ |
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|
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#include <linux/types.h> |
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#include <linux/init.h> |
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#include <linux/linkage.h> |
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#include <linux/kernel.h> |
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#include <linux/device.h> |
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#include <linux/pnp.h> |
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#include <linux/mm.h> |
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#include <linux/smp.h> |
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#include <linux/slab.h> |
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#include <linux/completion.h> |
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#include <linux/spinlock.h> |
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#include <linux/dmi.h> |
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#include <linux/delay.h> |
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#include <linux/acpi.h> |
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#include <linux/freezer.h> |
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#include <linux/kmod.h> |
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#include <linux/kthread.h> |
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|
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#include <asm/page.h> |
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#include <asm/desc.h> |
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#include <asm/byteorder.h> |
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#include "../base.h" |
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#include "pnpbios.h" |
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|
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/* |
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* |
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* PnP BIOS INTERFACE |
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* |
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*/ |
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static union pnp_bios_install_struct *pnp_bios_install = NULL; |
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int pnp_bios_present(void) |
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{ |
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return (pnp_bios_install != NULL); |
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} |
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struct pnp_dev_node_info node_info; |
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|
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/* |
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* |
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* DOCKING FUNCTIONS |
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* |
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*/ |
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static struct completion unload_sem; |
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|
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/* |
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* (Much of this belongs in a shared routine somewhere) |
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*/ |
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static int pnp_dock_event(int dock, struct pnp_docking_station_info *info) |
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{ |
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static char const sbin_pnpbios[] = "/sbin/pnpbios"; |
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char *argv[3], **envp, *buf, *scratch; |
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int i = 0, value; |
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if (!(envp = kcalloc(20, sizeof(char *), GFP_KERNEL))) |
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return -ENOMEM; |
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if (!(buf = kzalloc(256, GFP_KERNEL))) { |
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kfree(envp); |
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return -ENOMEM; |
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} |
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/* FIXME: if there are actual users of this, it should be |
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* integrated into the driver core and use the usual infrastructure |
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* like sysfs and uevents |
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*/ |
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argv[0] = (char *)sbin_pnpbios; |
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argv[1] = "dock"; |
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argv[2] = NULL; |
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/* minimal command environment */ |
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envp[i++] = "HOME=/"; |
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envp[i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin"; |
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#ifdef DEBUG |
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/* hint that policy agent should enter no-stdout debug mode */ |
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envp[i++] = "DEBUG=kernel"; |
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#endif |
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/* extensible set of named bus-specific parameters, |
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* supporting multiple driver selection algorithms. |
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*/ |
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scratch = buf; |
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/* action: add, remove */ |
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envp[i++] = scratch; |
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scratch += sprintf(scratch, "ACTION=%s", dock ? "add" : "remove") + 1; |
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/* Report the ident for the dock */ |
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envp[i++] = scratch; |
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scratch += sprintf(scratch, "DOCK=%x/%x/%x", |
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info->location_id, info->serial, info->capabilities); |
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envp[i] = NULL; |
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value = call_usermodehelper(sbin_pnpbios, argv, envp, UMH_WAIT_EXEC); |
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kfree(buf); |
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kfree(envp); |
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return 0; |
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} |
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/* |
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* Poll the PnP docking at regular intervals |
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*/ |
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static int pnp_dock_thread(void *unused) |
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{ |
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static struct pnp_docking_station_info now; |
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int docked = -1, d = 0; |
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set_freezable(); |
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while (1) { |
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int status; |
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/* |
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* Poll every 2 seconds |
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*/ |
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msleep_interruptible(2000); |
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if (try_to_freeze()) |
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continue; |
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status = pnp_bios_dock_station_info(&now); |
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switch (status) { |
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/* |
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* No dock to manage |
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*/ |
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case PNP_FUNCTION_NOT_SUPPORTED: |
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complete_and_exit(&unload_sem, 0); |
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case PNP_SYSTEM_NOT_DOCKED: |
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d = 0; |
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break; |
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case PNP_SUCCESS: |
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d = 1; |
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break; |
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default: |
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pnpbios_print_status("pnp_dock_thread", status); |
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printk(KERN_WARNING "PnPBIOS: disabling dock monitoring.\n"); |
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complete_and_exit(&unload_sem, 0); |
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} |
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if (d != docked) { |
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if (pnp_dock_event(d, &now) == 0) { |
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docked = d; |
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#if 0 |
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printk(KERN_INFO |
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"PnPBIOS: Docking station %stached\n", |
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docked ? "at" : "de"); |
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#endif |
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} |
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} |
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} |
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complete_and_exit(&unload_sem, 0); |
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} |
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static int pnpbios_get_resources(struct pnp_dev *dev) |
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{ |
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u8 nodenum = dev->number; |
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struct pnp_bios_node *node; |
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if (!pnpbios_is_dynamic(dev)) |
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return -EPERM; |
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pnp_dbg(&dev->dev, "get resources\n"); |
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node = kzalloc(node_info.max_node_size, GFP_KERNEL); |
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if (!node) |
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return -1; |
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if (pnp_bios_get_dev_node(&nodenum, (char)PNPMODE_DYNAMIC, node)) { |
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kfree(node); |
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return -ENODEV; |
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} |
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pnpbios_read_resources_from_node(dev, node); |
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dev->active = pnp_is_active(dev); |
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kfree(node); |
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return 0; |
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} |
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static int pnpbios_set_resources(struct pnp_dev *dev) |
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{ |
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u8 nodenum = dev->number; |
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struct pnp_bios_node *node; |
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int ret; |
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if (!pnpbios_is_dynamic(dev)) |
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return -EPERM; |
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pnp_dbg(&dev->dev, "set resources\n"); |
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node = kzalloc(node_info.max_node_size, GFP_KERNEL); |
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if (!node) |
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return -1; |
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if (pnp_bios_get_dev_node(&nodenum, (char)PNPMODE_DYNAMIC, node)) { |
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kfree(node); |
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return -ENODEV; |
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} |
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if (pnpbios_write_resources_to_node(dev, node) < 0) { |
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kfree(node); |
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return -1; |
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} |
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ret = pnp_bios_set_dev_node(node->handle, (char)PNPMODE_DYNAMIC, node); |
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kfree(node); |
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if (ret > 0) |
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ret = -1; |
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return ret; |
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} |
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static void pnpbios_zero_data_stream(struct pnp_bios_node *node) |
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{ |
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unsigned char *p = (char *)node->data; |
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unsigned char *end = (char *)(node->data + node->size); |
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unsigned int len; |
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int i; |
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while ((char *)p < (char *)end) { |
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if (p[0] & 0x80) { /* large tag */ |
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len = (p[2] << 8) | p[1]; |
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p += 3; |
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} else { |
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if (((p[0] >> 3) & 0x0f) == 0x0f) |
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return; |
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len = p[0] & 0x07; |
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p += 1; |
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} |
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for (i = 0; i < len; i++) |
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p[i] = 0; |
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p += len; |
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} |
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printk(KERN_ERR |
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"PnPBIOS: Resource structure did not contain an end tag.\n"); |
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} |
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static int pnpbios_disable_resources(struct pnp_dev *dev) |
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{ |
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struct pnp_bios_node *node; |
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u8 nodenum = dev->number; |
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int ret; |
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if (dev->flags & PNPBIOS_NO_DISABLE || !pnpbios_is_dynamic(dev)) |
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return -EPERM; |
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node = kzalloc(node_info.max_node_size, GFP_KERNEL); |
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if (!node) |
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return -ENOMEM; |
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if (pnp_bios_get_dev_node(&nodenum, (char)PNPMODE_DYNAMIC, node)) { |
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kfree(node); |
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return -ENODEV; |
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} |
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pnpbios_zero_data_stream(node); |
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ret = pnp_bios_set_dev_node(dev->number, (char)PNPMODE_DYNAMIC, node); |
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kfree(node); |
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if (ret > 0) |
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ret = -1; |
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return ret; |
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} |
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/* PnP Layer support */ |
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struct pnp_protocol pnpbios_protocol = { |
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.name = "Plug and Play BIOS", |
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.get = pnpbios_get_resources, |
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.set = pnpbios_set_resources, |
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.disable = pnpbios_disable_resources, |
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}; |
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static int __init insert_device(struct pnp_bios_node *node) |
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{ |
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struct pnp_dev *dev; |
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char id[8]; |
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int error; |
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/* check if the device is already added */ |
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list_for_each_entry(dev, &pnpbios_protocol.devices, protocol_list) { |
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if (dev->number == node->handle) |
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return -EEXIST; |
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} |
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pnp_eisa_id_to_string(node->eisa_id & PNP_EISA_ID_MASK, id); |
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dev = pnp_alloc_dev(&pnpbios_protocol, node->handle, id); |
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if (!dev) |
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return -ENOMEM; |
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pnpbios_parse_data_stream(dev, node); |
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dev->active = pnp_is_active(dev); |
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dev->flags = node->flags; |
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if (!(dev->flags & PNPBIOS_NO_CONFIG)) |
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dev->capabilities |= PNP_CONFIGURABLE; |
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if (!(dev->flags & PNPBIOS_NO_DISABLE) && pnpbios_is_dynamic(dev)) |
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dev->capabilities |= PNP_DISABLE; |
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dev->capabilities |= PNP_READ; |
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if (pnpbios_is_dynamic(dev)) |
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dev->capabilities |= PNP_WRITE; |
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if (dev->flags & PNPBIOS_REMOVABLE) |
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dev->capabilities |= PNP_REMOVABLE; |
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/* clear out the damaged flags */ |
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if (!dev->active) |
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pnp_init_resources(dev); |
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error = pnp_add_device(dev); |
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if (error) { |
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put_device(&dev->dev); |
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return error; |
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} |
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pnpbios_interface_attach_device(node); |
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return 0; |
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} |
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static void __init build_devlist(void) |
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{ |
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u8 nodenum; |
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unsigned int nodes_got = 0; |
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unsigned int devs = 0; |
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struct pnp_bios_node *node; |
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node = kzalloc(node_info.max_node_size, GFP_KERNEL); |
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if (!node) |
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return; |
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for (nodenum = 0; nodenum < 0xff;) { |
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u8 thisnodenum = nodenum; |
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/* eventually we will want to use PNPMODE_STATIC here but for now |
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* dynamic will help us catch buggy bioses to add to the blacklist. |
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*/ |
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if (!pnpbios_dont_use_current_config) { |
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if (pnp_bios_get_dev_node |
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(&nodenum, (char)PNPMODE_DYNAMIC, node)) |
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break; |
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} else { |
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if (pnp_bios_get_dev_node |
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(&nodenum, (char)PNPMODE_STATIC, node)) |
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break; |
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} |
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nodes_got++; |
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if (insert_device(node) == 0) |
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devs++; |
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if (nodenum <= thisnodenum) { |
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printk(KERN_ERR |
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"PnPBIOS: build_devlist: Node number 0x%x is out of sequence following node 0x%x. Aborting.\n", |
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(unsigned int)nodenum, |
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(unsigned int)thisnodenum); |
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break; |
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} |
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} |
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kfree(node); |
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printk(KERN_INFO |
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"PnPBIOS: %i node%s reported by PnP BIOS; %i recorded by driver\n", |
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nodes_got, nodes_got != 1 ? "s" : "", devs); |
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} |
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/* |
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* |
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* INIT AND EXIT |
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* |
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*/ |
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static int pnpbios_disabled; |
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int pnpbios_dont_use_current_config; |
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static int __init pnpbios_setup(char *str) |
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{ |
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int invert; |
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while ((str != NULL) && (*str != '\0')) { |
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if (strncmp(str, "off", 3) == 0) |
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pnpbios_disabled = 1; |
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if (strncmp(str, "on", 2) == 0) |
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pnpbios_disabled = 0; |
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invert = (strncmp(str, "no-", 3) == 0); |
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if (invert) |
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str += 3; |
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if (strncmp(str, "curr", 4) == 0) |
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pnpbios_dont_use_current_config = invert; |
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str = strchr(str, ','); |
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if (str != NULL) |
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str += strspn(str, ", \t"); |
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} |
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return 1; |
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} |
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__setup("pnpbios=", pnpbios_setup); |
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/* PnP BIOS signature: "$PnP" */ |
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#define PNP_SIGNATURE (('$' << 0) + ('P' << 8) + ('n' << 16) + ('P' << 24)) |
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static int __init pnpbios_probe_system(void) |
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{ |
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union pnp_bios_install_struct *check; |
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u8 sum; |
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int length, i; |
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printk(KERN_INFO "PnPBIOS: Scanning system for PnP BIOS support...\n"); |
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/* |
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* Search the defined area (0xf0000-0xffff0) for a valid PnP BIOS |
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* structure and, if one is found, sets up the selectors and |
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* entry points |
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*/ |
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for (check = (union pnp_bios_install_struct *)__va(0xf0000); |
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check < (union pnp_bios_install_struct *)__va(0xffff0); |
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check = (void *)check + 16) { |
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if (check->fields.signature != PNP_SIGNATURE) |
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continue; |
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printk(KERN_INFO |
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"PnPBIOS: Found PnP BIOS installation structure at 0x%p\n", |
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check); |
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length = check->fields.length; |
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if (!length) { |
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printk(KERN_ERR |
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"PnPBIOS: installation structure is invalid, skipping\n"); |
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continue; |
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} |
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for (sum = 0, i = 0; i < length; i++) |
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sum += check->chars[i]; |
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if (sum) { |
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printk(KERN_ERR |
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"PnPBIOS: installation structure is corrupted, skipping\n"); |
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continue; |
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} |
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if (check->fields.version < 0x10) { |
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printk(KERN_WARNING |
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"PnPBIOS: PnP BIOS version %d.%d is not supported\n", |
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check->fields.version >> 4, |
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check->fields.version & 15); |
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continue; |
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} |
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printk(KERN_INFO |
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"PnPBIOS: PnP BIOS version %d.%d, entry 0x%x:0x%x, dseg 0x%x\n", |
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check->fields.version >> 4, check->fields.version & 15, |
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check->fields.pm16cseg, check->fields.pm16offset, |
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check->fields.pm16dseg); |
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pnp_bios_install = check; |
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return 1; |
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} |
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printk(KERN_INFO "PnPBIOS: PnP BIOS support was not detected.\n"); |
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return 0; |
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} |
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static int __init exploding_pnp_bios(const struct dmi_system_id *d) |
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{ |
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printk(KERN_WARNING "%s detected. Disabling PnPBIOS\n", d->ident); |
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return 0; |
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} |
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static const struct dmi_system_id pnpbios_dmi_table[] __initconst = { |
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{ /* PnPBIOS GPF on boot */ |
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.callback = exploding_pnp_bios, |
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.ident = "Higraded P14H", |
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.matches = { |
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DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."), |
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DMI_MATCH(DMI_BIOS_VERSION, "07.00T"), |
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DMI_MATCH(DMI_SYS_VENDOR, "Higraded"), |
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DMI_MATCH(DMI_PRODUCT_NAME, "P14H"), |
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}, |
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}, |
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{ /* PnPBIOS GPF on boot */ |
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.callback = exploding_pnp_bios, |
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.ident = "ASUS P4P800", |
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.matches = { |
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DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer Inc."), |
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DMI_MATCH(DMI_BOARD_NAME, "P4P800"), |
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}, |
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}, |
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{} |
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}; |
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static int __init pnpbios_init(void) |
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{ |
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int ret; |
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if (pnpbios_disabled || dmi_check_system(pnpbios_dmi_table) || |
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arch_pnpbios_disabled()) { |
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printk(KERN_INFO "PnPBIOS: Disabled\n"); |
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return -ENODEV; |
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} |
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#ifdef CONFIG_PNPACPI |
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if (!acpi_disabled && !pnpacpi_disabled) { |
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pnpbios_disabled = 1; |
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printk(KERN_INFO "PnPBIOS: Disabled by ACPI PNP\n"); |
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return -ENODEV; |
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} |
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#endif /* CONFIG_ACPI */ |
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/* scan the system for pnpbios support */ |
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if (!pnpbios_probe_system()) |
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return -ENODEV; |
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|
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/* make preparations for bios calls */ |
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pnpbios_calls_init(pnp_bios_install); |
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|
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/* read the node info */ |
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ret = pnp_bios_dev_node_info(&node_info); |
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if (ret) { |
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printk(KERN_ERR |
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"PnPBIOS: Unable to get node info. Aborting.\n"); |
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return ret; |
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} |
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/* register with the pnp layer */ |
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ret = pnp_register_protocol(&pnpbios_protocol); |
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if (ret) { |
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printk(KERN_ERR |
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"PnPBIOS: Unable to register driver. Aborting.\n"); |
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return ret; |
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} |
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/* start the proc interface */ |
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ret = pnpbios_proc_init(); |
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if (ret) |
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printk(KERN_ERR "PnPBIOS: Failed to create proc interface.\n"); |
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/* scan for pnpbios devices */ |
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build_devlist(); |
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pnp_platform_devices = 1; |
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return 0; |
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} |
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fs_initcall(pnpbios_init); |
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static int __init pnpbios_thread_init(void) |
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{ |
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struct task_struct *task; |
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if (pnpbios_disabled) |
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return 0; |
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init_completion(&unload_sem); |
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task = kthread_run(pnp_dock_thread, NULL, "kpnpbiosd"); |
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return PTR_ERR_OR_ZERO(task); |
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} |
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/* Start the kernel thread later: */ |
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device_initcall(pnpbios_thread_init); |
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EXPORT_SYMBOL(pnpbios_protocol);
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