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
  34 #define _COMPONENT              ACPI_SYSTEM_COMPONENT
  35 ACPI_MODULE_NAME                ("acpi_system")
  36
  37 #define ACPI_SYSTEM_CLASS               "system"
  38 #define ACPI_SYSTEM_DRIVER_NAME         "ACPI System Driver"
  39 #define ACPI_SYSTEM_DEVICE_NAME         "System"
  40 #define ACPI_SYSTEM_FILE_INFO           "info"
  41 #define ACPI_SYSTEM_FILE_EVENT          "event"
  42 #define ACPI_SYSTEM_FILE_DSDT           "dsdt"
  43 #define ACPI_SYSTEM_FILE_FADT           "fadt"
  44
  45 extern FADT_DESCRIPTOR          acpi_fadt;
  46
  47 /* --------------------------------------------------------------------------
  48                               FS Interface (/proc)
  49    -------------------------------------------------------------------------- */
  50
  51 static int
  52 acpi_system_read_info (struct seq_file *seq, void *offset)
  53 {
  54         ACPI_FUNCTION_TRACE("acpi_system_read_info");
  55
  56         seq_printf(seq, "version:                 %x\n", ACPI_CA_VERSION);
  57         return_VALUE(0);
  58 }
  59
  60 static int acpi_system_info_open_fs(struct inode *inode, struct file *file)
  61 {
  62         return single_open(file, acpi_system_read_info, PDE(inode)->data);
  63 }
  64
  65 static struct file_operations acpi_system_info_ops = {
  66         .open           = acpi_system_info_open_fs,
  67         .read           = seq_read,
  68         .llseek         = seq_lseek,
  69         .release        = single_release,
  70 };
  71
  72 static ssize_t acpi_system_read_dsdt (struct file*, char __user *, size_t, loff_t*);
  73
  74 static struct file_operations acpi_system_dsdt_ops = {
  75         .read =                 acpi_system_read_dsdt,
  76 };
  77
  78 static ssize_t
  79 acpi_system_read_dsdt (
  80         struct file             *file,
  81         char                    __user *buffer,
  82         size_t                  count,
  83         loff_t                  *ppos)
  84 {
  85         acpi_status             status = AE_OK;
  86         struct acpi_buffer      dsdt = {ACPI_ALLOCATE_BUFFER, NULL};
  87         ssize_t                 res;
  88
  89         ACPI_FUNCTION_TRACE("acpi_system_read_dsdt");
  90
  91         status = acpi_get_table(ACPI_TABLE_DSDT, 1, &dsdt);
  92         if (ACPI_FAILURE(status))
  93                 return_VALUE(-ENODEV);
  94
  95         res = simple_read_from_buffer(buffer, count, ppos,
  96                                       dsdt.pointer, dsdt.length);
  97         acpi_os_free(dsdt.pointer);
  98
  99         return_VALUE(res);
 100 }
 101
 102
 103 static ssize_t acpi_system_read_fadt (struct file*, char __user *, size_t, loff_t*);
 104
 105 static struct file_operations acpi_system_fadt_ops = {
 106         .read =                 acpi_system_read_fadt,
 107 };
 108
 109 static ssize_t
 110 acpi_system_read_fadt (
 111         struct file             *file,
 112         char                    __user *buffer,
 113         size_t                  count,
 114         loff_t                  *ppos)
 115 {
 116         acpi_status             status = AE_OK;
 117         struct acpi_buffer      fadt = {ACPI_ALLOCATE_BUFFER, NULL};
 118         ssize_t                 res;
 119
 120         ACPI_FUNCTION_TRACE("acpi_system_read_fadt");
 121
 122         status = acpi_get_table(ACPI_TABLE_FADT, 1, &fadt);
 123         if (ACPI_FAILURE(status))
 124                 return_VALUE(-ENODEV);
 125
 126         res = simple_read_from_buffer(buffer, count, ppos,
 127                                       fadt.pointer, fadt.length);
 128         acpi_os_free(fadt.pointer);
 129
 130         return_VALUE(res);
 131 }
 132
 133
 134 static int __init acpi_system_init (void)
 135 {
 136         struct proc_dir_entry   *entry;
 137         int error = 0;
 138         char * name;
 139
 140         ACPI_FUNCTION_TRACE("acpi_system_init");
 141
 142         if (acpi_disabled)
 143                 return_VALUE(0);
 144
 145         /* 'info' [R] */
 146         name = ACPI_SYSTEM_FILE_INFO;
 147         entry = create_proc_entry(name,
 148                 S_IRUGO, acpi_root_dir);
 149         if (!entry)
 150                 goto Error;
 151         else {
 152                 entry->proc_fops = &acpi_system_info_ops;
 153         }
 154
 155         /* 'dsdt' [R] */
 156         name = ACPI_SYSTEM_FILE_DSDT;
 157         entry = create_proc_entry(name, S_IRUSR, acpi_root_dir);
 158         if (entry)
 159                 entry->proc_fops = &acpi_system_dsdt_ops;
 160         else
 161                 goto Error;
 162
 163         /* 'fadt' [R] */
 164         name = ACPI_SYSTEM_FILE_FADT;
 165         entry = create_proc_entry(name, S_IRUSR, acpi_root_dir);
 166         if (entry)
 167                 entry->proc_fops = &acpi_system_fadt_ops;
 168         else
 169                 goto Error;
 170
 171  Done:
 172         return_VALUE(error);
 173
 174  Error:
 175         ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 176                          "Unable to create '%s' proc fs entry\n", name));
 177
 178         remove_proc_entry(ACPI_SYSTEM_FILE_FADT, acpi_root_dir);
 179         remove_proc_entry(ACPI_SYSTEM_FILE_DSDT, acpi_root_dir);
 180         remove_proc_entry(ACPI_SYSTEM_FILE_INFO, acpi_root_dir);
 181
 182         error = -EFAULT;
 183         goto Done;
 184 }
 185
 186
 187 subsys_initcall(acpi_system_init);