drivers/acpi/ac.c

   1 /*
   2  *  acpi_ac.c - ACPI AC Adapter Driver ($Revision: 27 $)
   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/kernel.h>
  27 #include <linux/module.h>
  28 #include <linux/init.h>
  29 #include <linux/types.h>
  30 #include <linux/proc_fs.h>
  31 #include <linux/seq_file.h>
  32 #include <acpi/acpi_bus.h>
  33 #include <acpi/acpi_drivers.h>
  34
  35
  36 #define ACPI_AC_COMPONENT               0x00020000
  37 #define ACPI_AC_CLASS                   "ac_adapter"
  38 #define ACPI_AC_HID                     "ACPI0003"
  39 #define ACPI_AC_DRIVER_NAME             "ACPI AC Adapter Driver"
  40 #define ACPI_AC_DEVICE_NAME             "AC Adapter"
  41 #define ACPI_AC_FILE_STATE              "state"
  42 #define ACPI_AC_NOTIFY_STATUS           0x80
  43 #define ACPI_AC_STATUS_OFFLINE          0x00
  44 #define ACPI_AC_STATUS_ONLINE           0x01
  45 #define ACPI_AC_STATUS_UNKNOWN          0xFF
  46
  47 #define _COMPONENT              ACPI_AC_COMPONENT
  48 ACPI_MODULE_NAME                ("acpi_ac")
  49
  50 MODULE_AUTHOR("Paul Diefenbaugh");
  51 MODULE_DESCRIPTION(ACPI_AC_DRIVER_NAME);
  52 MODULE_LICENSE("GPL");
  53
  54 static int acpi_ac_add (struct acpi_device *device);
  55 static int acpi_ac_remove (struct acpi_device *device, int type);
  56 static int acpi_ac_open_fs(struct inode *inode, struct file *file);
  57
  58 static struct acpi_driver acpi_ac_driver = {
  59         .name =         ACPI_AC_DRIVER_NAME,
  60         .class =        ACPI_AC_CLASS,
  61         .ids =          ACPI_AC_HID,
  62         .ops =          {
  63                                 .add =          acpi_ac_add,
  64                                 .remove =       acpi_ac_remove,
  65                         },
  66 };
  67
  68 struct acpi_ac {
  69         acpi_handle             handle;
  70         unsigned long           state;
  71 };
  72
  73 static struct file_operations acpi_ac_fops = {
  74         .open           = acpi_ac_open_fs,
  75         .read           = seq_read,
  76         .llseek         = seq_lseek,
  77         .release        = single_release,
  78 };
  79
  80 /* --------------------------------------------------------------------------
  81                                AC Adapter Management
  82    -------------------------------------------------------------------------- */
  83
  84 static int
  85 acpi_ac_get_state (
  86         struct acpi_ac          *ac)
  87 {
  88         acpi_status             status = AE_OK;
  89
  90         ACPI_FUNCTION_TRACE("acpi_ac_get_state");
  91
  92         if (!ac)
  93                 return_VALUE(-EINVAL);
  94
  95         status = acpi_evaluate_integer(ac->handle, "_PSR", NULL, &ac->state);
  96         if (ACPI_FAILURE(status)) {
  97                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
  98                         "Error reading AC Adapter state\n"));
  99                 ac->state = ACPI_AC_STATUS_UNKNOWN;
 100                 return_VALUE(-ENODEV);
 101         }
 102
 103         return_VALUE(0);
 104 }
 105
 106
 107 /* --------------------------------------------------------------------------
 108                               FS Interface (/proc)
 109    -------------------------------------------------------------------------- */
 110
 111 static struct proc_dir_entry    *acpi_ac_dir;
 112
 113 static int acpi_ac_seq_show(struct seq_file *seq, void *offset)
 114 {
 115         struct acpi_ac          *ac = (struct acpi_ac *) seq->private;
 116
 117         ACPI_FUNCTION_TRACE("acpi_ac_seq_show");
 118
 119         if (!ac)
 120                 return_VALUE(0);
 121
 122         if (acpi_ac_get_state(ac)) {
 123                 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n");
 124                 return_VALUE(0);
 125         }
 126
 127         seq_puts(seq, "state:                   ");
 128         switch (ac->state) {
 129         case ACPI_AC_STATUS_OFFLINE:
 130                 seq_puts(seq, "off-line\n");
 131                 break;
 132         case ACPI_AC_STATUS_ONLINE:
 133                 seq_puts(seq, "on-line\n");
 134                 break;
 135         default:
 136                 seq_puts(seq, "unknown\n");
 137                 break;
 138         }
 139
 140         return_VALUE(0);
 141 }
 142
 143 static int acpi_ac_open_fs(struct inode *inode, struct file *file)
 144 {
 145         return single_open(file, acpi_ac_seq_show, PDE(inode)->data);
 146 }
 147
 148 static int
 149 acpi_ac_add_fs (
 150         struct acpi_device      *device)
 151 {
 152         struct proc_dir_entry   *entry = NULL;
 153
 154         ACPI_FUNCTION_TRACE("acpi_ac_add_fs");
 155
 156         if (!acpi_device_dir(device)) {
 157                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 158                         acpi_ac_dir);
 159                 if (!acpi_device_dir(device))
 160                         return_VALUE(-ENODEV);
 161                 acpi_device_dir(device)->owner = THIS_MODULE;
 162         }
 163
 164         /* 'state' [R] */
 165         entry = create_proc_entry(ACPI_AC_FILE_STATE,
 166                 S_IRUGO, acpi_device_dir(device));
 167         if (!entry)
 168                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 169                         "Unable to create '%s' fs entry\n",
 170                         ACPI_AC_FILE_STATE));
 171         else {
 172                 entry->proc_fops = &acpi_ac_fops;
 173                 entry->data = acpi_driver_data(device);
 174                 entry->owner = THIS_MODULE;
 175         }
 176
 177         return_VALUE(0);
 178 }
 179
 180
 181 static int
 182 acpi_ac_remove_fs (
 183         struct acpi_device      *device)
 184 {
 185         ACPI_FUNCTION_TRACE("acpi_ac_remove_fs");
 186
 187         if (acpi_device_dir(device)) {
 188                 remove_proc_entry(ACPI_AC_FILE_STATE,
 189                                   acpi_device_dir(device));
 190
 191                 remove_proc_entry(acpi_device_bid(device), acpi_ac_dir);
 192                 acpi_device_dir(device) = NULL;
 193         }
 194
 195         return_VALUE(0);
 196 }
 197
 198
 199 /* --------------------------------------------------------------------------
 200                                    Driver Model
 201    -------------------------------------------------------------------------- */
 202
 203 static void
 204 acpi_ac_notify (
 205         acpi_handle             handle,
 206         u32                     event,
 207         void                    *data)
 208 {
 209         struct acpi_ac          *ac = (struct acpi_ac *) data;
 210         struct acpi_device      *device = NULL;
 211
 212         ACPI_FUNCTION_TRACE("acpi_ac_notify");
 213
 214         if (!ac)
 215                 return_VOID;
 216
 217         if (acpi_bus_get_device(ac->handle, &device))
 218                 return_VOID;
 219
 220         switch (event) {
 221         case ACPI_AC_NOTIFY_STATUS:
 222                 acpi_ac_get_state(ac);
 223                 acpi_bus_generate_event(device, event, (u32) ac->state);
 224                 break;
 225         default:
 226                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 227                         "Unsupported event [0x%x]\n", event));
 228                 break;
 229         }
 230
 231         return_VOID;
 232 }
 233
 234
 235 static int
 236 acpi_ac_add (
 237         struct acpi_device      *device)
 238 {
 239         int                     result = 0;
 240         acpi_status             status = AE_OK;
 241         struct acpi_ac          *ac = NULL;
 242
 243         ACPI_FUNCTION_TRACE("acpi_ac_add");
 244
 245         if (!device)
 246                 return_VALUE(-EINVAL);
 247
 248         ac = kmalloc(sizeof(struct acpi_ac), GFP_KERNEL);
 249         if (!ac)
 250                 return_VALUE(-ENOMEM);
 251         memset(ac, 0, sizeof(struct acpi_ac));
 252
 253         ac->handle = device->handle;
 254         strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
 255         strcpy(acpi_device_class(device), ACPI_AC_CLASS);
 256         acpi_driver_data(device) = ac;
 257
 258         result = acpi_ac_get_state(ac);
 259         if (result)
 260                 goto end;
 261
 262         result = acpi_ac_add_fs(device);
 263         if (result)
 264                 goto end;
 265
 266         status = acpi_install_notify_handler(ac->handle,
 267                 ACPI_DEVICE_NOTIFY, acpi_ac_notify, ac);
 268         if (ACPI_FAILURE(status)) {
 269                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 270                         "Error installing notify handler\n"));
 271                 result = -ENODEV;
 272                 goto end;
 273         }
 274
 275         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
 276                 acpi_device_name(device), acpi_device_bid(device),
 277                 ac->state?"on-line":"off-line");
 278
 279 end:
 280         if (result) {
 281                 acpi_ac_remove_fs(device);
 282                 kfree(ac);
 283         }
 284
 285         return_VALUE(result);
 286 }
 287
 288
 289 static int
 290 acpi_ac_remove (
 291         struct acpi_device      *device,
 292         int                     type)
 293 {
 294         acpi_status             status = AE_OK;
 295         struct acpi_ac          *ac = NULL;
 296
 297         ACPI_FUNCTION_TRACE("acpi_ac_remove");
 298
 299         if (!device || !acpi_driver_data(device))
 300                 return_VALUE(-EINVAL);
 301
 302         ac = (struct acpi_ac *) acpi_driver_data(device);
 303
 304         status = acpi_remove_notify_handler(ac->handle,
 305                 ACPI_DEVICE_NOTIFY, acpi_ac_notify);
 306         if (ACPI_FAILURE(status))
 307                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 308                         "Error removing notify handler\n"));
 309
 310         acpi_ac_remove_fs(device);
 311
 312         kfree(ac);
 313
 314         return_VALUE(0);
 315 }
 316
 317
 318 static int __init
 319 acpi_ac_init (void)
 320 {
 321         int                     result = 0;
 322
 323         ACPI_FUNCTION_TRACE("acpi_ac_init");
 324
 325         acpi_ac_dir = proc_mkdir(ACPI_AC_CLASS, acpi_root_dir);
 326         if (!acpi_ac_dir)
 327                 return_VALUE(-ENODEV);
 328         acpi_ac_dir->owner = THIS_MODULE;
 329
 330         result = acpi_bus_register_driver(&acpi_ac_driver);
 331         if (result < 0) {
 332                 remove_proc_entry(ACPI_AC_CLASS, acpi_root_dir);
 333                 return_VALUE(-ENODEV);
 334         }
 335
 336         return_VALUE(0);
 337 }
 338
 339
 340 static void __exit
 341 acpi_ac_exit (void)
 342 {
 343         ACPI_FUNCTION_TRACE("acpi_ac_exit");
 344
 345         acpi_bus_unregister_driver(&acpi_ac_driver);
 346
 347         remove_proc_entry(ACPI_AC_CLASS, acpi_root_dir);
 348
 349         return_VOID;
 350 }
 351
 352
 353 module_init(acpi_ac_init);
 354 module_exit(acpi_ac_exit);