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Diffstat (limited to 'drivers/pnp/pnpbios/core.c')
-rw-r--r--drivers/pnp/pnpbios/core.c577
1 files changed, 577 insertions, 0 deletions
diff --git a/drivers/pnp/pnpbios/core.c b/drivers/pnp/pnpbios/core.c
new file mode 100644
index 000000000..9b760e73e
--- /dev/null
+++ b/drivers/pnp/pnpbios/core.c
@@ -0,0 +1,577 @@
+// 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:
+ 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 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);
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-10 03:23:58 +0000