/* * 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 * Modifications (C) 1998 Tom Lees * Minor reorganizations by David Hinds * Further modifications (C) 2001, 2002 by: * Alan Cox * Thomas Hood * Brian Gerst * * Ported to the PnP Layer and several additional improvements (C) 2002 * by Adam Belay * * 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 - - 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "pnpbios.h" /* * * PnP BIOS INTERFACE * */ static union pnp_bios_install_struct * pnp_bios_install = NULL; int pnp_bios_present(void) { return (pnp_bios_install != NULL); } struct pnp_dev_node_info node_info; /* * * DOCKING FUNCTIONS * */ #ifdef CONFIG_HOTPLUG static 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 (!current->fs->root) { return -EAGAIN; } if (!(envp = (char **) kcalloc (20, sizeof (char *), GFP_KERNEL))) { return -ENOMEM; } if (!(buf = kcalloc (1, 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, 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()) 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 = kcalloc(1, 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 = kcalloc(1, 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 = kcalloc(1, 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 = kcalloc(1, 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 = kcalloc(1, 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 = kcalloc(1, 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[] __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)) { 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);