/* *  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_COMPONENTACPI_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"#define ACPI_SYSTEM_FILE_INFO		"info"#define ACPI_SYSTEM_FILE_EVENT		"event"#define ACPI_SYSTEM_FILE_DSDT		"dsdt"#define ACPI_SYSTEM_FILE_FADT		"fadt" /* * 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 (/proc)   -------------------------------------------------------------------------- */#ifdef CONFIG_ACPI_PROCFS 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,};#endif 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_tacpi_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_tacpi_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 __init acpi_system_init(void){	struct proc_dir_entry *entry;	int error = 0;	char *name;  	if (acpi_disabled)		return 0; #ifdef CONFIG_ACPI_PROCFS	/* '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;	}#endif 	/* '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);#ifdef CONFIG_ACPI_PROCFS	remove_proc_entry(ACPI_SYSTEM_FILE_INFO, acpi_root_dir);#endif 	error = -EFAULT;	goto Done;} subsys_initcall(acpi_system_init);