diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/pnp/pnpbios/core.c | |
download | linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.bz2 |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'drivers/pnp/pnpbios/core.c')
-rw-r--r-- | drivers/pnp/pnpbios/core.c | 644 |
1 files changed, 644 insertions, 0 deletions
diff --git a/drivers/pnp/pnpbios/core.c b/drivers/pnp/pnpbios/core.c new file mode 100644 index 000000000000..0f6330b3af12 --- /dev/null +++ b/drivers/pnp/pnpbios/core.c @@ -0,0 +1,644 @@ +/* + * 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/pnpbios.h> +#include <linux/device.h> +#include <linux/pnp.h> +#include <linux/mm.h> +#include <linux/smp.h> +#include <linux/slab.h> +#include <linux/kobject_uevent.h> +#include <linux/completion.h> +#include <linux/spinlock.h> +#include <linux/dmi.h> +#include <linux/delay.h> +#include <linux/acpi.h> + +#include <asm/page.h> +#include <asm/desc.h> +#include <asm/system.h> +#include <asm/byteorder.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; + +void *pnpbios_kmalloc(size_t size, int f) +{ + void *p = kmalloc( size, f ); + if ( p == NULL ) + printk(KERN_ERR "PnPBIOS: kmalloc() failed\n"); + else + memset(p, 0, size); + return p; +} + +/* + * + * DOCKING FUNCTIONS + * + */ + +#ifdef CONFIG_HOTPLUG + +static int unloading = 0; +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 (!hotplug_path [0]) + return -ENOENT; + if (!current->fs->root) { + return -EAGAIN; + } + if (!(envp = (char **) pnpbios_kmalloc (20 * sizeof (char *), GFP_KERNEL))) { + return -ENOMEM; + } + if (!(buf = pnpbios_kmalloc (256, GFP_KERNEL))) { + kfree (envp); + return -ENOMEM; + } + + /* only one standardized param to hotplug command: type */ + argv [0] = hotplug_path; + 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, 0); + 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; + daemonize("kpnpbiosd"); + allow_signal(SIGKILL); + while(!unloading && !signal_pending(current)) + { + int status; + + /* + * Poll every 2 seconds + */ + msleep_interruptible(2000); + + if(signal_pending(current)) { + if (try_to_freeze(PF_FREEZE)) + continue; + break; + } + + 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, struct pnp_resource_table * res) +{ + u8 nodenum = dev->number; + struct pnp_bios_node * node; + + /* just in case */ + if(!pnpbios_is_dynamic(dev)) + return -EPERM; + + node = pnpbios_kmalloc(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(res, node); + dev->active = pnp_is_active(dev); + kfree(node); + return 0; +} + +static int pnpbios_set_resources(struct pnp_dev * dev, struct pnp_resource_table * res) +{ + u8 nodenum = dev->number; + struct pnp_bios_node * node; + int ret; + + /* just in case */ + if (!pnpbios_is_dynamic(dev)) + return -EPERM; + + node = pnpbios_kmalloc(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(res, 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; + + /* just in case */ + if(dev->flags & PNPBIOS_NO_DISABLE || !pnpbios_is_dynamic(dev)) + return -EPERM; + + node = pnpbios_kmalloc(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 insert_device(struct pnp_dev *dev, struct pnp_bios_node * node) +{ + struct list_head * pos; + struct pnp_dev * pnp_dev; + struct pnp_id *dev_id; + char id[8]; + + /* check if the device is already added */ + dev->number = node->handle; + list_for_each (pos, &pnpbios_protocol.devices){ + pnp_dev = list_entry(pos, struct pnp_dev, protocol_list); + if (dev->number == pnp_dev->number) + return -1; + } + + /* set the initial values for the PnP device */ + dev_id = pnpbios_kmalloc(sizeof(struct pnp_id), GFP_KERNEL); + if (!dev_id) + return -1; + pnpid32_to_pnpid(node->eisa_id,id); + memcpy(dev_id->id,id,7); + pnp_add_id(dev_id, dev); + 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)) + 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; + dev->protocol = &pnpbios_protocol; + + /* clear out the damaged flags */ + if (!dev->active) + pnp_init_resource_table(&dev->res); + + 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; + struct pnp_dev *dev; + + node = pnpbios_kmalloc(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++; + dev = pnpbios_kmalloc(sizeof (struct pnp_dev), GFP_KERNEL); + if (!dev) + break; + if(insert_device(dev,node)<0) + kfree(dev); + else + 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; /* = 0 */ +int pnpbios_dont_use_current_config; /* = 0 */ + +#ifndef MODULE +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); +#endif + +/* 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(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[] = { + { /* 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)) { + 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(); + + return 0; +} + +subsys_initcall(pnpbios_init); + +static int __init pnpbios_thread_init(void) +{ + if (pnpbios_disabled) + return 0; +#ifdef CONFIG_HOTPLUG + init_completion(&unload_sem); + if (kernel_thread(pnp_dock_thread, NULL, CLONE_KERNEL) > 0) + unloading = 0; +#endif + return 0; +} + +#ifndef MODULE + +/* init/main.c calls pnpbios_init early */ + +/* Start the kernel thread later: */ +module_init(pnpbios_thread_init); + +#else + +/* + * N.B.: Building pnpbios as a module hasn't been fully implemented + */ + +MODULE_LICENSE("GPL"); + +static int __init pnpbios_init_all(void) +{ + int r; + + r = pnpbios_init(); + if (r) + return r; + r = pnpbios_thread_init(); + if (r) + return r; + return 0; +} + +static void __exit pnpbios_exit(void) +{ +#ifdef CONFIG_HOTPLUG + unloading = 1; + wait_for_completion(&unload_sem); +#endif + pnpbios_proc_exit(); + /* We ought to free resources here */ + return; +} + +module_init(pnpbios_init_all); +module_exit(pnpbios_exit); + +#endif + +EXPORT_SYMBOL(pnpbios_protocol); |