drivers/acpi/system.c

   1 /*
   2  *  acpi_system.c - ACPI System Driver ($Revision: 63 $)
   3  *
   4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   6  *
   7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or (at
  12  *  your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful, but
  15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  *  General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License along
  20  *  with this program; if not, write to the Free Software Foundation, Inc.,
  21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  22  *
  23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  24  */
  25
  26 #include <linux/proc_fs.h>
  27 #include <linux/seq_file.h>
  28 #include <linux/init.h>
  29 #include <asm/uaccess.h>
  30
  31 #include <acpi/acpi_drivers.h>
  32
  33 #define _COMPONENT              ACPI_SYSTEM_COMPONENT
  34 ACPI_MODULE_NAME("acpi_system")
  35 #define ACPI_SYSTEM_CLASS               "system"
  36 #define ACPI_SYSTEM_DRIVER_NAME         "ACPI System Driver"
  37 #define ACPI_SYSTEM_DEVICE_NAME         "System"
  38 #define ACPI_SYSTEM_FILE_INFO           "info"
  39 #define ACPI_SYSTEM_FILE_EVENT          "event"
  40 #define ACPI_SYSTEM_FILE_DSDT           "dsdt"
  41 #define ACPI_SYSTEM_FILE_FADT           "fadt"
  42 extern struct fadt_descriptor acpi_fadt;
  43
  44 /* --------------------------------------------------------------------------
  45                               FS Interface (/proc)
  46    -------------------------------------------------------------------------- */
  47
  48 static int acpi_system_read_info(struct seq_file *seq, void *offset)
  49 {
  50
  51         seq_printf(seq, "version:                 %x\n", ACPI_CA_VERSION);
  52         return 0;
  53 }
  54
  55 static int acpi_system_info_open_fs(struct inode *inode, struct file *file)
  56 {
  57         return single_open(file, acpi_system_read_info, PDE(inode)->data);
  58 }
  59
  60 static const struct file_operations acpi_system_info_ops = {
  61         .open = acpi_system_info_open_fs,
  62         .read = seq_read,
  63         .llseek = seq_lseek,
  64         .release = single_release,
  65 };
  66
  67 static ssize_t acpi_system_read_dsdt(struct file *, char __user *, size_t,
  68                                      loff_t *);
  69
  70 static const struct file_operations acpi_system_dsdt_ops = {
  71         .read = acpi_system_read_dsdt,
  72 };
  73
  74 static ssize_t
  75 acpi_system_read_dsdt(struct file *file,
  76                       char __user * buffer, size_t count, loff_t * ppos)
  77 {
  78         acpi_status status = AE_OK;
  79         struct acpi_buffer dsdt = { ACPI_ALLOCATE_BUFFER, NULL };
  80         ssize_t res;
  81
  82
  83         status = acpi_get_table(ACPI_TABLE_ID_DSDT, 1, &dsdt);
  84         if (ACPI_FAILURE(status))
  85                 return -ENODEV;
  86
  87         res = simple_read_from_buffer(buffer, count, ppos,
  88                                       dsdt.pointer, dsdt.length);
  89         kfree(dsdt.pointer);
  90
  91         return res;
  92 }
  93
  94 static ssize_t acpi_system_read_fadt(struct file *, char __user *, size_t,
  95                                      loff_t *);
  96
  97 static const struct file_operations acpi_system_fadt_ops = {
  98         .read = acpi_system_read_fadt,
  99 };
 100
 101 static ssize_t
 102 acpi_system_read_fadt(struct file *file,
 103                       char __user * buffer, size_t count, loff_t * ppos)
 104 {
 105         acpi_status status = AE_OK;
 106         struct acpi_buffer fadt = { ACPI_ALLOCATE_BUFFER, NULL };
 107         ssize_t res;
 108
 109
 110         status = acpi_get_table(ACPI_TABLE_ID_FADT, 1, &fadt);
 111         if (ACPI_FAILURE(status))
 112                 return -ENODEV;
 113
 114         res = simple_read_from_buffer(buffer, count, ppos,
 115                                       fadt.pointer, fadt.length);
 116         kfree(fadt.pointer);
 117
 118         return res;
 119 }
 120
 121 static int __init acpi_system_init(void)
 122 {
 123         struct proc_dir_entry *entry;
 124         int error = 0;
 125         char *name;
 126
 127
 128         if (acpi_disabled)
 129                 return 0;
 130
 131         /* 'info' [R] */
 132         name = ACPI_SYSTEM_FILE_INFO;
 133         entry = create_proc_entry(name, S_IRUGO, acpi_root_dir);
 134         if (!entry)
 135                 goto Error;
 136         else {
 137                 entry->proc_fops = &acpi_system_info_ops;
 138         }
 139
 140         /* 'dsdt' [R] */
 141         name = ACPI_SYSTEM_FILE_DSDT;
 142         entry = create_proc_entry(name, S_IRUSR, acpi_root_dir);
 143         if (entry)
 144                 entry->proc_fops = &acpi_system_dsdt_ops;
 145         else
 146                 goto Error;
 147
 148         /* 'fadt' [R] */
 149         name = ACPI_SYSTEM_FILE_FADT;
 150         entry = create_proc_entry(name, S_IRUSR, acpi_root_dir);
 151         if (entry)
 152                 entry->proc_fops = &acpi_system_fadt_ops;
 153         else
 154                 goto Error;
 155
 156       Done:
 157         return error;
 158
 159       Error:
 160         remove_proc_entry(ACPI_SYSTEM_FILE_FADT, acpi_root_dir);
 161         remove_proc_entry(ACPI_SYSTEM_FILE_DSDT, acpi_root_dir);
 162         remove_proc_entry(ACPI_SYSTEM_FILE_INFO, acpi_root_dir);
 163
 164         error = -EFAULT;
 165         goto Done;
 166 }
 167
 168 subsys_initcall(acpi_system_init);