166 lines
4.3 KiB
C
166 lines
4.3 KiB
C
/*
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* acpi_system.c - ACPI System Driver ($Revision: 63 $)
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*
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* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
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* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*/
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/init.h>
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#include <asm/uaccess.h>
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#include <acpi/acpi_drivers.h>
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#define _COMPONENT ACPI_SYSTEM_COMPONENT
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ACPI_MODULE_NAME("acpi_system")
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#define ACPI_SYSTEM_CLASS "system"
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#define ACPI_SYSTEM_DRIVER_NAME "ACPI System Driver"
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#define ACPI_SYSTEM_DEVICE_NAME "System"
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#define ACPI_SYSTEM_FILE_INFO "info"
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#define ACPI_SYSTEM_FILE_EVENT "event"
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#define ACPI_SYSTEM_FILE_DSDT "dsdt"
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#define ACPI_SYSTEM_FILE_FADT "fadt"
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/* --------------------------------------------------------------------------
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FS Interface (/proc)
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-------------------------------------------------------------------------- */
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static int acpi_system_read_info(struct seq_file *seq, void *offset)
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{
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seq_printf(seq, "version: %x\n", ACPI_CA_VERSION);
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return 0;
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}
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static int acpi_system_info_open_fs(struct inode *inode, struct file *file)
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{
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return single_open(file, acpi_system_read_info, PDE(inode)->data);
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}
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static const struct file_operations acpi_system_info_ops = {
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.open = acpi_system_info_open_fs,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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static ssize_t acpi_system_read_dsdt(struct file *, char __user *, size_t,
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loff_t *);
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static const struct file_operations acpi_system_dsdt_ops = {
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.read = acpi_system_read_dsdt,
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};
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static ssize_t
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acpi_system_read_dsdt(struct file *file,
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char __user * buffer, size_t count, loff_t * ppos)
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{
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acpi_status status = AE_OK;
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struct acpi_table_header *dsdt = NULL;
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ssize_t res;
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status = acpi_get_table(ACPI_SIG_DSDT, 1, &dsdt);
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if (ACPI_FAILURE(status))
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return -ENODEV;
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res = simple_read_from_buffer(buffer, count, ppos,
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dsdt, dsdt->length);
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return res;
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}
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static ssize_t acpi_system_read_fadt(struct file *, char __user *, size_t,
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loff_t *);
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static const struct file_operations acpi_system_fadt_ops = {
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.read = acpi_system_read_fadt,
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};
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static ssize_t
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acpi_system_read_fadt(struct file *file,
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char __user * buffer, size_t count, loff_t * ppos)
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{
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acpi_status status = AE_OK;
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struct acpi_table_header *fadt = NULL;
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ssize_t res;
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status = acpi_get_table(ACPI_SIG_FADT, 1, &fadt);
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if (ACPI_FAILURE(status))
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return -ENODEV;
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res = simple_read_from_buffer(buffer, count, ppos,
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fadt, fadt->length);
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return res;
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}
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static int __init acpi_system_init(void)
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{
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struct proc_dir_entry *entry;
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int error = 0;
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char *name;
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if (acpi_disabled)
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return 0;
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/* 'info' [R] */
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name = ACPI_SYSTEM_FILE_INFO;
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entry = create_proc_entry(name, S_IRUGO, acpi_root_dir);
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if (!entry)
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goto Error;
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else {
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entry->proc_fops = &acpi_system_info_ops;
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}
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/* 'dsdt' [R] */
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name = ACPI_SYSTEM_FILE_DSDT;
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entry = create_proc_entry(name, S_IRUSR, acpi_root_dir);
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if (entry)
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entry->proc_fops = &acpi_system_dsdt_ops;
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else
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goto Error;
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/* 'fadt' [R] */
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name = ACPI_SYSTEM_FILE_FADT;
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entry = create_proc_entry(name, S_IRUSR, acpi_root_dir);
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if (entry)
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entry->proc_fops = &acpi_system_fadt_ops;
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else
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goto Error;
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Done:
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return error;
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Error:
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remove_proc_entry(ACPI_SYSTEM_FILE_FADT, acpi_root_dir);
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remove_proc_entry(ACPI_SYSTEM_FILE_DSDT, acpi_root_dir);
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remove_proc_entry(ACPI_SYSTEM_FILE_INFO, acpi_root_dir);
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error = -EFAULT;
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goto Done;
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}
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subsys_initcall(acpi_system_init);
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