/* * acpi_system.c - ACPI System Driver ($Revision: 63 $) * * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.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 of the License, 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. * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */ #include <linux/proc_fs.h> #include <linux/seq_file.h> #include <linux/init.h> #include <asm/uaccess.h> #include <acpi/acpi_drivers.h> #define _COMPONENT ACPI_SYSTEM_COMPONENT ACPI_MODULE_NAME("system"); #ifdef MODULE_PARAM_PREFIX #undef MODULE_PARAM_PREFIX #endif #define MODULE_PARAM_PREFIX "acpi." #define ACPI_SYSTEM_CLASS "system" #define ACPI_SYSTEM_DEVICE_NAME "System" /* * Make ACPICA version work as module param */ static int param_get_acpica_version(char *buffer, struct kernel_param *kp) { int result; result = sprintf(buffer, "%x", ACPI_CA_VERSION); return result; } module_param_call(acpica_version, NULL, param_get_acpica_version, NULL, 0444); /* -------------------------------------------------------------------------- FS Interface (/sys) -------------------------------------------------------------------------- */ static LIST_HEAD(acpi_table_attr_list); static struct kobject tables_kobj; struct acpi_table_attr { struct bin_attribute attr; char name[8]; int instance; struct list_head node; }; static ssize_t acpi_table_show(struct kobject *kobj, struct bin_attribute *bin_attr, char *buf, loff_t offset, size_t count) { struct acpi_table_attr *table_attr = container_of(bin_attr, struct acpi_table_attr, attr); struct acpi_table_header *table_header = NULL; acpi_status status; ssize_t ret_count = count; status = acpi_get_table(table_attr->name, table_attr->instance, &table_header); if (ACPI_FAILURE(status)) return -ENODEV; if (offset >= table_header->length) { ret_count = 0; goto end; } if (offset + ret_count > table_header->length) ret_count = table_header->length - offset; memcpy(buf, ((char *)table_header) + offset, ret_count); end: return ret_count; } static void acpi_table_attr_init(struct acpi_table_attr *table_attr, struct acpi_table_header *table_header) { struct acpi_table_header *header = NULL; struct acpi_table_attr *attr = NULL; memcpy(table_attr->name, table_header->signature, ACPI_NAME_SIZE); list_for_each_entry(attr, &acpi_table_attr_list, node) { if (!memcmp(table_header->signature, attr->name, ACPI_NAME_SIZE)) if (table_attr->instance < attr->instance) table_attr->instance = attr->instance; } table_attr->instance++; if (table_attr->instance > 1 || (table_attr->instance == 1 && !acpi_get_table(table_header-> signature, 2, &header))) sprintf(table_attr->name + 4, "%d", table_attr->instance); table_attr->attr.size = 0; table_attr->attr.read = acpi_table_show; table_attr->attr.attr.name = table_attr->name; table_attr->attr.attr.mode = 0444; table_attr->attr.attr.owner = THIS_MODULE; return; } static int acpi_system_sysfs_init(void) { struct acpi_table_attr *table_attr; struct acpi_table_header *table_header = NULL; int table_index = 0; int result; tables_kobj.parent = &acpi_subsys.kobj; kobject_set_name(&tables_kobj, "tables"); result = kobject_register(&tables_kobj); if (result) return result; do { result = acpi_get_table_by_index(table_index, &table_header); if (!result) { table_index++; table_attr = NULL; table_attr = kzalloc(sizeof(struct acpi_table_attr), GFP_KERNEL); if (!table_attr) return -ENOMEM; acpi_table_attr_init(table_attr, table_header); result = sysfs_create_bin_file(&tables_kobj, &table_attr->attr); if (result) { kfree(table_attr); return result; } else list_add_tail(&table_attr->node, &acpi_table_attr_list); } } while (!result); return 0; } /* -------------------------------------------------------------------------- FS Interface (/proc) -------------------------------------------------------------------------- */ #ifdef CONFIG_ACPI_PROCFS #define ACPI_SYSTEM_FILE_INFO "info" #define ACPI_SYSTEM_FILE_EVENT "event" #define ACPI_SYSTEM_FILE_DSDT "dsdt" #define ACPI_SYSTEM_FILE_FADT "fadt" static int acpi_system_read_info(struct seq_file *seq, void *offset) { seq_printf(seq, "version: %x\n", ACPI_CA_VERSION); return 0; } static int acpi_system_info_open_fs(struct inode *inode, struct file *file) { return single_open(file, acpi_system_read_info, PDE(inode)->data); } static const struct file_operations acpi_system_info_ops = { .open = acpi_system_info_open_fs, .read = seq_read, .llseek = seq_lseek, .release = single_release, }; static ssize_t acpi_system_read_dsdt(struct file *, char __user *, size_t, loff_t *); static const struct file_operations acpi_system_dsdt_ops = { .read = acpi_system_read_dsdt, }; static ssize_t acpi_system_read_dsdt(struct file *file, char __user * buffer, size_t count, loff_t * ppos) { acpi_status status = AE_OK; struct acpi_table_header *dsdt = NULL; ssize_t res; status = acpi_get_table(ACPI_SIG_DSDT, 1, &dsdt); if (ACPI_FAILURE(status)) return -ENODEV; res = simple_read_from_buffer(buffer, count, ppos, dsdt, dsdt->length); return res; } static ssize_t acpi_system_read_fadt(struct file *, char __user *, size_t, loff_t *); static const struct file_operations acpi_system_fadt_ops = { .read = acpi_system_read_fadt, }; static ssize_t acpi_system_read_fadt(struct file *file, char __user * buffer, size_t count, loff_t * ppos) { acpi_status status = AE_OK; struct acpi_table_header *fadt = NULL; ssize_t res; status = acpi_get_table(ACPI_SIG_FADT, 1, &fadt); if (ACPI_FAILURE(status)) return -ENODEV; res = simple_read_from_buffer(buffer, count, ppos, fadt, fadt->length); return res; } static int acpi_system_procfs_init(void) { struct proc_dir_entry *entry; int error = 0; char *name; /* 'info' [R] */ name = ACPI_SYSTEM_FILE_INFO; entry = create_proc_entry(name, S_IRUGO, acpi_root_dir); if (!entry) goto Error; else { entry->proc_fops = &acpi_system_info_ops; } /* 'dsdt' [R] */ name = ACPI_SYSTEM_FILE_DSDT; entry = create_proc_entry(name, S_IRUSR, acpi_root_dir); if (entry) entry->proc_fops = &acpi_system_dsdt_ops; else goto Error; /* 'fadt' [R] */ name = ACPI_SYSTEM_FILE_FADT; entry = create_proc_entry(name, S_IRUSR, acpi_root_dir); if (entry) entry->proc_fops = &acpi_system_fadt_ops; else goto Error; Done: return error; Error: remove_proc_entry(ACPI_SYSTEM_FILE_FADT, acpi_root_dir); remove_proc_entry(ACPI_SYSTEM_FILE_DSDT, acpi_root_dir); remove_proc_entry(ACPI_SYSTEM_FILE_INFO, acpi_root_dir); error = -EFAULT; goto Done; } #else static int acpi_system_procfs_init(void) { return 0; } #endif static int __init acpi_system_init(void) { int result = 0; if (acpi_disabled) return 0; result = acpi_system_procfs_init(); if (result) return result; result = acpi_system_sysfs_init(); return result; } subsys_initcall(acpi_system_init);