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 #ifdef CONFIG_ACPI_PROCFS_POWER
  31 #include <linux/proc_fs.h>
  32 #include <linux/seq_file.h>
  33 #endif
  34 #ifdef CONFIG_ACPI_SYSFS_POWER
  35 #include <linux/power_supply.h>
  36 #endif
  37 #include <acpi/acpi_bus.h>
  38 #include <acpi/acpi_drivers.h>
  39
  40 #define ACPI_AC_COMPONENT               0x00020000
  41 #define ACPI_AC_CLASS                   "ac_adapter"
  42 #define ACPI_AC_DEVICE_NAME             "AC Adapter"
  43 #define ACPI_AC_FILE_STATE              "state"
  44 #define ACPI_AC_NOTIFY_STATUS           0x80
  45 #define ACPI_AC_STATUS_OFFLINE          0x00
  46 #define ACPI_AC_STATUS_ONLINE           0x01
  47 #define ACPI_AC_STATUS_UNKNOWN          0xFF
  48
  49 #define _COMPONENT              ACPI_AC_COMPONENT
  50 ACPI_MODULE_NAME("ac");
  51
  52 MODULE_AUTHOR("Paul Diefenbaugh");
  53 MODULE_DESCRIPTION("ACPI AC Adapter Driver");
  54 MODULE_LICENSE("GPL");
  55
  56 #ifdef CONFIG_ACPI_PROCFS_POWER
  57 extern struct proc_dir_entry *acpi_lock_ac_dir(void);
  58 extern void *acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);
  59 static int acpi_ac_open_fs(struct inode *inode, struct file *file);
  60 #endif
  61
  62 static int acpi_ac_add(struct acpi_device *device);
  63 static int acpi_ac_remove(struct acpi_device *device, int type);
  64 static int acpi_ac_resume(struct acpi_device *device);
  65
  66 const static struct acpi_device_id ac_device_ids[] = {
  67         {"ACPI0003", 0},
  68         {"", 0},
  69 };
  70 MODULE_DEVICE_TABLE(acpi, ac_device_ids);
  71
  72 static struct acpi_driver acpi_ac_driver = {
  73         .name = "ac",
  74         .class = ACPI_AC_CLASS,
  75         .ids = ac_device_ids,
  76         .ops = {
  77                 .add = acpi_ac_add,
  78                 .remove = acpi_ac_remove,
  79                 .resume = acpi_ac_resume,
  80                 },
  81 };
  82
  83 struct acpi_ac {
  84 #ifdef CONFIG_ACPI_SYSFS_POWER
  85         struct power_supply charger;
  86 #endif
  87         struct acpi_device * device;
  88         unsigned long state;
  89 };
  90
  91 #define to_acpi_ac(x) container_of(x, struct acpi_ac, charger);
  92
  93 #ifdef CONFIG_ACPI_PROCFS_POWER
  94 static const struct file_operations acpi_ac_fops = {
  95         .open = acpi_ac_open_fs,
  96         .read = seq_read,
  97         .llseek = seq_lseek,
  98         .release = single_release,
  99 };
 100 #endif
 101 #ifdef CONFIG_ACPI_SYSFS_POWER
 102 static int get_ac_property(struct power_supply *psy,
 103                            enum power_supply_property psp,
 104                            union power_supply_propval *val)
 105 {
 106         struct acpi_ac *ac = to_acpi_ac(psy);
 107         switch (psp) {
 108         case POWER_SUPPLY_PROP_ONLINE:
 109                 val->intval = ac->state;
 110                 break;
 111         default:
 112                 return -EINVAL;
 113         }
 114         return 0;
 115 }
 116
 117 static enum power_supply_property ac_props[] = {
 118         POWER_SUPPLY_PROP_ONLINE,
 119 };
 120 #endif
 121 /* --------------------------------------------------------------------------
 122                                AC Adapter Management
 123    -------------------------------------------------------------------------- */
 124
 125 static int acpi_ac_get_state(struct acpi_ac *ac)
 126 {
 127         acpi_status status = AE_OK;
 128
 129
 130         if (!ac)
 131                 return -EINVAL;
 132
 133         status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL, &ac->state);
 134         if (ACPI_FAILURE(status)) {
 135                 ACPI_EXCEPTION((AE_INFO, status, "Error reading AC Adapter state"));
 136                 ac->state = ACPI_AC_STATUS_UNKNOWN;
 137                 return -ENODEV;
 138         }
 139
 140         return 0;
 141 }
 142
 143 #ifdef CONFIG_ACPI_PROCFS_POWER
 144 /* --------------------------------------------------------------------------
 145                               FS Interface (/proc)
 146    -------------------------------------------------------------------------- */
 147
 148 static struct proc_dir_entry *acpi_ac_dir;
 149
 150 static int acpi_ac_seq_show(struct seq_file *seq, void *offset)
 151 {
 152         struct acpi_ac *ac = seq->private;
 153
 154
 155         if (!ac)
 156                 return 0;
 157
 158         if (acpi_ac_get_state(ac)) {
 159                 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n");
 160                 return 0;
 161         }
 162
 163         seq_puts(seq, "state:                   ");
 164         switch (ac->state) {
 165         case ACPI_AC_STATUS_OFFLINE:
 166                 seq_puts(seq, "off-line\n");
 167                 break;
 168         case ACPI_AC_STATUS_ONLINE:
 169                 seq_puts(seq, "on-line\n");
 170                 break;
 171         default:
 172                 seq_puts(seq, "unknown\n");
 173                 break;
 174         }
 175
 176         return 0;
 177 }
 178
 179 static int acpi_ac_open_fs(struct inode *inode, struct file *file)
 180 {
 181         return single_open(file, acpi_ac_seq_show, PDE(inode)->data);
 182 }
 183
 184 static int acpi_ac_add_fs(struct acpi_device *device)
 185 {
 186         struct proc_dir_entry *entry = NULL;
 187
 188
 189         if (!acpi_device_dir(device)) {
 190                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 191                                                      acpi_ac_dir);
 192                 if (!acpi_device_dir(device))
 193                         return -ENODEV;
 194                 acpi_device_dir(device)->owner = THIS_MODULE;
 195         }
 196
 197         /* 'state' [R] */
 198         entry = create_proc_entry(ACPI_AC_FILE_STATE,
 199                                   S_IRUGO, acpi_device_dir(device));
 200         if (!entry)
 201                 return -ENODEV;
 202         else {
 203                 entry->proc_fops = &acpi_ac_fops;
 204                 entry->data = acpi_driver_data(device);
 205                 entry->owner = THIS_MODULE;
 206         }
 207
 208         return 0;
 209 }
 210
 211 static int acpi_ac_remove_fs(struct acpi_device *device)
 212 {
 213
 214         if (acpi_device_dir(device)) {
 215                 remove_proc_entry(ACPI_AC_FILE_STATE, acpi_device_dir(device));
 216
 217                 remove_proc_entry(acpi_device_bid(device), acpi_ac_dir);
 218                 acpi_device_dir(device) = NULL;
 219         }
 220
 221         return 0;
 222 }
 223 #endif
 224
 225 /* --------------------------------------------------------------------------
 226                                    Driver Model
 227    -------------------------------------------------------------------------- */
 228
 229 static void acpi_ac_notify(acpi_handle handle, u32 event, void *data)
 230 {
 231         struct acpi_ac *ac = data;
 232         struct acpi_device *device = NULL;
 233
 234
 235         if (!ac)
 236                 return;
 237
 238         device = ac->device;
 239         switch (event) {
 240         case ACPI_AC_NOTIFY_STATUS:
 241         case ACPI_NOTIFY_BUS_CHECK:
 242         case ACPI_NOTIFY_DEVICE_CHECK:
 243                 acpi_ac_get_state(ac);
 244                 acpi_bus_generate_proc_event(device, event, (u32) ac->state);
 245                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 246                                                   device->dev.bus_id, event,
 247                                                   (u32) ac->state);
 248 #ifdef CONFIG_ACPI_SYSFS_POWER
 249                 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
 250 #endif
 251                 break;
 252         default:
 253                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 254                                   "Unsupported event [0x%x]\n", event));
 255                 break;
 256         }
 257
 258         return;
 259 }
 260
 261 static int acpi_ac_add(struct acpi_device *device)
 262 {
 263         int result = 0;
 264         acpi_status status = AE_OK;
 265         struct acpi_ac *ac = NULL;
 266
 267
 268         if (!device)
 269                 return -EINVAL;
 270
 271         ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
 272         if (!ac)
 273                 return -ENOMEM;
 274
 275         ac->device = device;
 276         strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
 277         strcpy(acpi_device_class(device), ACPI_AC_CLASS);
 278         acpi_driver_data(device) = ac;
 279
 280         result = acpi_ac_get_state(ac);
 281         if (result)
 282                 goto end;
 283
 284 #ifdef CONFIG_ACPI_PROCFS_POWER
 285         result = acpi_ac_add_fs(device);
 286 #endif
 287         if (result)
 288                 goto end;
 289 #ifdef CONFIG_ACPI_SYSFS_POWER
 290         ac->charger.name = acpi_device_bid(device);
 291         ac->charger.type = POWER_SUPPLY_TYPE_MAINS;
 292         ac->charger.properties = ac_props;
 293         ac->charger.num_properties = ARRAY_SIZE(ac_props);
 294         ac->charger.get_property = get_ac_property;
 295         power_supply_register(&ac->device->dev, &ac->charger);
 296 #endif
 297         status = acpi_install_notify_handler(device->handle,
 298                                              ACPI_ALL_NOTIFY, acpi_ac_notify,
 299                                              ac);
 300         if (ACPI_FAILURE(status)) {
 301                 result = -ENODEV;
 302                 goto end;
 303         }
 304
 305         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
 306                acpi_device_name(device), acpi_device_bid(device),
 307                ac->state ? "on-line" : "off-line");
 308
 309       end:
 310         if (result) {
 311 #ifdef CONFIG_ACPI_PROCFS_POWER
 312                 acpi_ac_remove_fs(device);
 313 #endif
 314                 kfree(ac);
 315         }
 316
 317         return result;
 318 }
 319
 320 static int acpi_ac_resume(struct acpi_device *device)
 321 {
 322         struct acpi_ac *ac;
 323         unsigned old_state;
 324         if (!device || !acpi_driver_data(device))
 325                 return -EINVAL;
 326         ac = acpi_driver_data(device);
 327         old_state = ac->state;
 328         if (acpi_ac_get_state(ac))
 329                 return 0;
 330 #ifdef CONFIG_ACPI_SYSFS_POWER
 331         if (old_state != ac->state)
 332                 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
 333 #endif
 334         return 0;
 335 }
 336
 337 static int acpi_ac_remove(struct acpi_device *device, int type)
 338 {
 339         acpi_status status = AE_OK;
 340         struct acpi_ac *ac = NULL;
 341
 342
 343         if (!device || !acpi_driver_data(device))
 344                 return -EINVAL;
 345
 346         ac = acpi_driver_data(device);
 347
 348         status = acpi_remove_notify_handler(device->handle,
 349                                             ACPI_ALL_NOTIFY, acpi_ac_notify);
 350 #ifdef CONFIG_ACPI_SYSFS_POWER
 351         if (ac->charger.dev)
 352                 power_supply_unregister(&ac->charger);
 353 #endif
 354 #ifdef CONFIG_ACPI_PROCFS_POWER
 355         acpi_ac_remove_fs(device);
 356 #endif
 357
 358         kfree(ac);
 359
 360         return 0;
 361 }
 362
 363 static int __init acpi_ac_init(void)
 364 {
 365         int result;
 366
 367         if (acpi_disabled)
 368                 return -ENODEV;
 369
 370 #ifdef CONFIG_ACPI_PROCFS_POWER
 371         acpi_ac_dir = acpi_lock_ac_dir();
 372         if (!acpi_ac_dir)
 373                 return -ENODEV;
 374 #endif
 375
 376         result = acpi_bus_register_driver(&acpi_ac_driver);
 377         if (result < 0) {
 378 #ifdef CONFIG_ACPI_PROCFS_POWER
 379                 acpi_unlock_ac_dir(acpi_ac_dir);
 380 #endif
 381                 return -ENODEV;
 382         }
 383
 384         return 0;
 385 }
 386
 387 static void __exit acpi_ac_exit(void)
 388 {
 389
 390         acpi_bus_unregister_driver(&acpi_ac_driver);
 391
 392 #ifdef CONFIG_ACPI_PROCFS_POWER
 393         acpi_unlock_ac_dir(acpi_ac_dir);
 394 #endif
 395
 396         return;
 397 }
 398
 399 module_init(acpi_ac_init);
 400 module_exit(acpi_ac_exit);