From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- drivers/pnp/pnpbios/core.c | 591 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 591 insertions(+) create mode 100644 drivers/pnp/pnpbios/core.c (limited to 'drivers/pnp/pnpbios/core.c') diff --git a/drivers/pnp/pnpbios/core.c b/drivers/pnp/pnpbios/core.c new file mode 100644 index 000000000..facd43b85 --- /dev/null +++ b/drivers/pnp/pnpbios/core.c @@ -0,0 +1,591 @@ +/* + * 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 "../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) +{ + 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; +} + +/* + * 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); +} + +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 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; +} + +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 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) || + paravirt_enabled()) { + 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"); + if (IS_ERR(task)) + return PTR_ERR(task); + + return 0; +} + +/* Start the kernel thread later: */ +module_init(pnpbios_thread_init); + +EXPORT_SYMBOL(pnpbios_protocol); -- cgit v1.2.3-54-g00ecf