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