| /* |
| * 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" |
| extern struct fadt_descriptor acpi_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_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; |
| |
| #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); |