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/*
* 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")
#ifdef MODULE_PARAM_PREFIX
#undef MODULE_PARAM_PREFIX
#endif
#define MODULE_PARAM_PREFIX "acpi."
#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"
/*
* 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_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 __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);
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