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