/* * 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("acpi_system") #define ACPI_SYSTEM_CLASS "system" #define ACPI_SYSTEM_DRIVER_NAME "ACPI System Driver" #define ACPI_SYSTEM_DEVICE_NAME "System" #define ACPI_SYSTEM_FILE_INFO "info" #define ACPI_SYSTEM_FILE_EVENT "event" #define ACPI_SYSTEM_FILE_DSDT "dsdt" #define ACPI_SYSTEM_FILE_FADT "fadt" extern struct fadt_descriptor acpi_fadt; /* -------------------------------------------------------------------------- FS Interface (/proc) -------------------------------------------------------------------------- */ 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_buffer dsdt = { ACPI_ALLOCATE_BUFFER, NULL }; ssize_t res; status = acpi_get_table(ACPI_TABLE_ID_DSDT, 1, &dsdt); if (ACPI_FAILURE(status)) return -ENODEV; res = simple_read_from_buffer(buffer, count, ppos, dsdt.pointer, dsdt.length); kfree(dsdt.pointer); 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_buffer fadt = { ACPI_ALLOCATE_BUFFER, NULL }; ssize_t res; status = acpi_get_table(ACPI_TABLE_ID_FADT, 1, &fadt); if (ACPI_FAILURE(status)) return -ENODEV; res = simple_read_from_buffer(buffer, count, ppos, fadt.pointer, fadt.length); kfree(fadt.pointer); return res; } static int __init acpi_system_init(void) { struct proc_dir_entry *entry; int error = 0; char *name; if (acpi_disabled) return 0; /* '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; } subsys_initcall(acpi_system_init);