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 #ifdef MODULE_PARAM_PREFIX
  36 #undef MODULE_PARAM_PREFIX
  37 #endif
  38 #define MODULE_PARAM_PREFIX "acpi."
  39
  40 #define ACPI_SYSTEM_CLASS               "system"
  41 #define ACPI_SYSTEM_DRIVER_NAME         "ACPI System Driver"
  42 #define ACPI_SYSTEM_DEVICE_NAME         "System"
  43 #define ACPI_SYSTEM_FILE_INFO           "info"
  44 #define ACPI_SYSTEM_FILE_EVENT          "event"
  45 #define ACPI_SYSTEM_FILE_DSDT           "dsdt"
  46 #define ACPI_SYSTEM_FILE_FADT           "fadt"
  47 extern struct fadt_descriptor acpi_fadt;
  48
  49 /*
  50  * Make ACPICA version work as module param
  51  */
  52 static int param_get_acpica_version(char *buffer, struct kernel_param *kp) {
  53         int result;
  54
  55         result = sprintf(buffer, "%x", ACPI_CA_VERSION);
  56
  57         return result;
  58 }
  59
  60 module_param_call(acpica_version, NULL, param_get_acpica_version, NULL, 0444);
  61
  62 /* --------------------------------------------------------------------------
  63                               FS Interface (/proc)
  64    -------------------------------------------------------------------------- */
  65 #ifdef CONFIG_ACPI_PROCFS
  66
  67 static int acpi_system_read_info(struct seq_file *seq, void *offset)
  68 {
  69
  70         seq_printf(seq, "version:                 %x\n", ACPI_CA_VERSION);
  71         return 0;
  72 }
  73
  74 static int acpi_system_info_open_fs(struct inode *inode, struct file *file)
  75 {
  76         return single_open(file, acpi_system_read_info, PDE(inode)->data);
  77 }
  78
  79 static const struct file_operations acpi_system_info_ops = {
  80         .open = acpi_system_info_open_fs,
  81         .read = seq_read,
  82         .llseek = seq_lseek,
  83         .release = single_release,
  84 };
  85 #endif
  86
  87 static ssize_t acpi_system_read_dsdt(struct file *, char __user *, size_t,
  88                                      loff_t *);
  89
  90 static const struct file_operations acpi_system_dsdt_ops = {
  91         .read = acpi_system_read_dsdt,
  92 };
  93
  94 static ssize_t
  95 acpi_system_read_dsdt(struct file *file,
  96                       char __user * buffer, size_t count, loff_t * ppos)
  97 {
  98         acpi_status status = AE_OK;
  99         struct acpi_buffer dsdt = { ACPI_ALLOCATE_BUFFER, NULL };
 100         ssize_t res;
 101
 102
 103         status = acpi_get_table(ACPI_TABLE_ID_DSDT, 1, &dsdt);
 104         if (ACPI_FAILURE(status))
 105                 return -ENODEV;
 106
 107         res = simple_read_from_buffer(buffer, count, ppos,
 108                                       dsdt.pointer, dsdt.length);
 109         kfree(dsdt.pointer);
 110
 111         return res;
 112 }
 113
 114 static ssize_t acpi_system_read_fadt(struct file *, char __user *, size_t,
 115                                      loff_t *);
 116
 117 static const struct file_operations acpi_system_fadt_ops = {
 118         .read = acpi_system_read_fadt,
 119 };
 120
 121 static ssize_t
 122 acpi_system_read_fadt(struct file *file,
 123                       char __user * buffer, size_t count, loff_t * ppos)
 124 {
 125         acpi_status status = AE_OK;
 126         struct acpi_buffer fadt = { ACPI_ALLOCATE_BUFFER, NULL };
 127         ssize_t res;
 128
 129
 130         status = acpi_get_table(ACPI_TABLE_ID_FADT, 1, &fadt);
 131         if (ACPI_FAILURE(status))
 132                 return -ENODEV;
 133
 134         res = simple_read_from_buffer(buffer, count, ppos,
 135                                       fadt.pointer, fadt.length);
 136         kfree(fadt.pointer);
 137
 138         return res;
 139 }
 140
 141 static int __init acpi_system_init(void)
 142 {
 143         struct proc_dir_entry *entry;
 144         int error = 0;
 145         char *name;
 146
 147
 148         if (acpi_disabled)
 149                 return 0;
 150
 151 #ifdef CONFIG_ACPI_PROCFS
 152         /* 'info' [R] */
 153         name = ACPI_SYSTEM_FILE_INFO;
 154         entry = create_proc_entry(name, S_IRUGO, acpi_root_dir);
 155         if (!entry)
 156                 goto Error;
 157         else {
 158                 entry->proc_fops = &acpi_system_info_ops;
 159         }
 160 #endif
 161
 162         /* 'dsdt' [R] */
 163         name = ACPI_SYSTEM_FILE_DSDT;
 164         entry = create_proc_entry(name, S_IRUSR, acpi_root_dir);
 165         if (entry)
 166                 entry->proc_fops = &acpi_system_dsdt_ops;
 167         else
 168                 goto Error;
 169
 170         /* 'fadt' [R] */
 171         name = ACPI_SYSTEM_FILE_FADT;
 172         entry = create_proc_entry(name, S_IRUSR, acpi_root_dir);
 173         if (entry)
 174                 entry->proc_fops = &acpi_system_fadt_ops;
 175         else
 176                 goto Error;
 177
 178       Done:
 179         return error;
 180
 181       Error:
 182         remove_proc_entry(ACPI_SYSTEM_FILE_FADT, acpi_root_dir);
 183         remove_proc_entry(ACPI_SYSTEM_FILE_DSDT, acpi_root_dir);
 184 #ifdef CONFIG_ACPI_PROCFS
 185         remove_proc_entry(ACPI_SYSTEM_FILE_INFO, acpi_root_dir);
 186 #endif
 187
 188         error = -EFAULT;
 189         goto Done;
 190 }
 191
 192 subsys_initcall(acpi_system_init);