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