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