diff options
Diffstat (limited to 'drivers/acpi/system.c')
| -rw-r--r-- | drivers/acpi/system.c | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/drivers/acpi/system.c b/drivers/acpi/system.c new file mode 100644 index 000000000000..8925a6ca5f87 --- /dev/null +++ b/drivers/acpi/system.c @@ -0,0 +1,187 @@ +/* + * 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 FADT_DESCRIPTOR acpi_fadt; + +/* -------------------------------------------------------------------------- + FS Interface (/proc) + -------------------------------------------------------------------------- */ + +static int +acpi_system_read_info (struct seq_file *seq, void *offset) +{ + ACPI_FUNCTION_TRACE("acpi_system_read_info"); + + seq_printf(seq, "version: %x\n", ACPI_CA_VERSION); + return_VALUE(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 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 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; + + ACPI_FUNCTION_TRACE("acpi_system_read_dsdt"); + + status = acpi_get_table(ACPI_TABLE_DSDT, 1, &dsdt); + if (ACPI_FAILURE(status)) + return_VALUE(-ENODEV); + + res = simple_read_from_buffer(buffer, count, ppos, + dsdt.pointer, dsdt.length); + acpi_os_free(dsdt.pointer); + + return_VALUE(res); +} + + +static ssize_t acpi_system_read_fadt (struct file*, char __user *, size_t, loff_t*); + +static 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; + + ACPI_FUNCTION_TRACE("acpi_system_read_fadt"); + + status = acpi_get_table(ACPI_TABLE_FADT, 1, &fadt); + if (ACPI_FAILURE(status)) + return_VALUE(-ENODEV); + + res = simple_read_from_buffer(buffer, count, ppos, + fadt.pointer, fadt.length); + acpi_os_free(fadt.pointer); + + return_VALUE(res); +} + + +static int __init acpi_system_init (void) +{ + struct proc_dir_entry *entry; + int error = 0; + char * name; + + ACPI_FUNCTION_TRACE("acpi_system_init"); + + if (acpi_disabled) + return_VALUE(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_VALUE(error); + + Error: + ACPI_DEBUG_PRINT((ACPI_DB_ERROR, + "Unable to create '%s' proc fs entry\n", name)); + + 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); |