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
  65 static const struct acpi_device_id ac_device_ids[] = {
  66         {"ACPI0003", 0},
  67         {"", 0},
  68 };
  69 MODULE_DEVICE_TABLE(acpi, ac_device_ids);
  70
  71 static struct acpi_driver acpi_ac_driver = {
  72         .name = "ac",
  73         .class = ACPI_AC_CLASS,
  74         .ids = ac_device_ids,
  75         .ops = {
  76                 .add = acpi_ac_add,
  77                 .remove = acpi_ac_remove,
  78                 .resume = acpi_ac_resume,
  79                 },
  80 };
  81
  82 struct acpi_ac {
  83 #ifdef CONFIG_ACPI_SYSFS_POWER
  84         struct power_supply charger;
  85 #endif
  86         struct acpi_device * device;
  87         unsigned long long state;
  88 };
  89
  90 #define to_acpi_ac(x) container_of(x, struct acpi_ac, charger);
  91
  92 #ifdef CONFIG_ACPI_PROCFS_POWER
  93 static const struct file_operations acpi_ac_fops = {
  94         .owner = THIS_MODULE,
  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 = proc_create_data(ACPI_AC_FILE_STATE,
 199                                  S_IRUGO, acpi_device_dir(device),
 200                                  &acpi_ac_fops, acpi_driver_data(device));
 201         if (!entry)
 202                 return -ENODEV;
 203         return 0;
 204 }
 205
 206 static int acpi_ac_remove_fs(struct acpi_device *device)
 207 {
 208
 209         if (acpi_device_dir(device)) {
 210                 remove_proc_entry(ACPI_AC_FILE_STATE, acpi_device_dir(device));
 211
 212                 remove_proc_entry(acpi_device_bid(device), acpi_ac_dir);
 213                 acpi_device_dir(device) = NULL;
 214         }
 215
 216         return 0;
 217 }
 218 #endif
 219
 220 /* --------------------------------------------------------------------------
 221                                    Driver Model
 222    -------------------------------------------------------------------------- */
 223
 224 static void acpi_ac_notify(acpi_handle handle, u32 event, void *data)
 225 {
 226         struct acpi_ac *ac = data;
 227         struct acpi_device *device = NULL;
 228
 229
 230         if (!ac)
 231                 return;
 232
 233         device = ac->device;
 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         acpi_status status = AE_OK;
 258         struct acpi_ac *ac = NULL;
 259
 260
 261         if (!device)
 262                 return -EINVAL;
 263
 264         ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
 265         if (!ac)
 266                 return -ENOMEM;
 267
 268         ac->device = device;
 269         strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
 270         strcpy(acpi_device_class(device), ACPI_AC_CLASS);
 271         device->driver_data = ac;
 272
 273         result = acpi_ac_get_state(ac);
 274         if (result)
 275                 goto end;
 276
 277 #ifdef CONFIG_ACPI_PROCFS_POWER
 278         result = acpi_ac_add_fs(device);
 279 #endif
 280         if (result)
 281                 goto end;
 282 #ifdef CONFIG_ACPI_SYSFS_POWER
 283         ac->charger.name = acpi_device_bid(device);
 284         ac->charger.type = POWER_SUPPLY_TYPE_MAINS;
 285         ac->charger.properties = ac_props;
 286         ac->charger.num_properties = ARRAY_SIZE(ac_props);
 287         ac->charger.get_property = get_ac_property;
 288         power_supply_register(&ac->device->dev, &ac->charger);
 289 #endif
 290         status = acpi_install_notify_handler(device->handle,
 291                                              ACPI_ALL_NOTIFY, acpi_ac_notify,
 292                                              ac);
 293         if (ACPI_FAILURE(status)) {
 294                 result = -ENODEV;
 295                 goto end;
 296         }
 297
 298         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
 299                acpi_device_name(device), acpi_device_bid(device),
 300                ac->state ? "on-line" : "off-line");
 301
 302       end:
 303         if (result) {
 304 #ifdef CONFIG_ACPI_PROCFS_POWER
 305                 acpi_ac_remove_fs(device);
 306 #endif
 307                 kfree(ac);
 308         }
 309
 310         return result;
 311 }
 312
 313 static int acpi_ac_resume(struct acpi_device *device)
 314 {
 315         struct acpi_ac *ac;
 316         unsigned old_state;
 317         if (!device || !acpi_driver_data(device))
 318                 return -EINVAL;
 319         ac = acpi_driver_data(device);
 320         old_state = ac->state;
 321         if (acpi_ac_get_state(ac))
 322                 return 0;
 323 #ifdef CONFIG_ACPI_SYSFS_POWER
 324         if (old_state != ac->state)
 325                 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
 326 #endif
 327         return 0;
 328 }
 329
 330 static int acpi_ac_remove(struct acpi_device *device, int type)
 331 {
 332         acpi_status status = AE_OK;
 333         struct acpi_ac *ac = NULL;
 334
 335
 336         if (!device || !acpi_driver_data(device))
 337                 return -EINVAL;
 338
 339         ac = acpi_driver_data(device);
 340
 341         status = acpi_remove_notify_handler(device->handle,
 342                                             ACPI_ALL_NOTIFY, acpi_ac_notify);
 343 #ifdef CONFIG_ACPI_SYSFS_POWER
 344         if (ac->charger.dev)
 345                 power_supply_unregister(&ac->charger);
 346 #endif
 347 #ifdef CONFIG_ACPI_PROCFS_POWER
 348         acpi_ac_remove_fs(device);
 349 #endif
 350
 351         kfree(ac);
 352
 353         return 0;
 354 }
 355
 356 static int __init acpi_ac_init(void)
 357 {
 358         int result;
 359
 360         if (acpi_disabled)
 361                 return -ENODEV;
 362
 363 #ifdef CONFIG_ACPI_PROCFS_POWER
 364         acpi_ac_dir = acpi_lock_ac_dir();
 365         if (!acpi_ac_dir)
 366                 return -ENODEV;
 367 #endif
 368
 369         result = acpi_bus_register_driver(&acpi_ac_driver);
 370         if (result < 0) {
 371 #ifdef CONFIG_ACPI_PROCFS_POWER
 372                 acpi_unlock_ac_dir(acpi_ac_dir);
 373 #endif
 374                 return -ENODEV;
 375         }
 376
 377         return 0;
 378 }
 379
 380 static void __exit acpi_ac_exit(void)
 381 {
 382
 383         acpi_bus_unregister_driver(&acpi_ac_driver);
 384
 385 #ifdef CONFIG_ACPI_PROCFS_POWER
 386         acpi_unlock_ac_dir(acpi_ac_dir);
 387 #endif
 388
 389         return;
 390 }
 391
 392 module_init(acpi_ac_init);
 393 module_exit(acpi_ac_exit);