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 #include <linux/power_supply.h>
  35 #include <acpi/acpi_bus.h>
  36 #include <acpi/acpi_drivers.h>
  37
  38 #define ACPI_AC_COMPONENT               0x00020000
  39 #define ACPI_AC_CLASS                   "ac_adapter"
  40 #define ACPI_AC_DEVICE_NAME             "AC Adapter"
  41 #define ACPI_AC_FILE_STATE              "state"
  42 #define ACPI_AC_NOTIFY_STATUS           0x80
  43 #define ACPI_AC_STATUS_OFFLINE          0x00
  44 #define ACPI_AC_STATUS_ONLINE           0x01
  45 #define ACPI_AC_STATUS_UNKNOWN          0xFF
  46
  47 #define _COMPONENT              ACPI_AC_COMPONENT
  48 ACPI_MODULE_NAME("ac");
  49
  50 MODULE_AUTHOR("Paul Diefenbaugh");
  51 MODULE_DESCRIPTION("ACPI AC Adapter Driver");
  52 MODULE_LICENSE("GPL");
  53
  54 #ifdef CONFIG_ACPI_PROCFS_POWER
  55 extern struct proc_dir_entry *acpi_lock_ac_dir(void);
  56 extern void *acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);
  57 static int acpi_ac_open_fs(struct inode *inode, struct file *file);
  58 #endif
  59
  60 static int acpi_ac_add(struct acpi_device *device);
  61 static int acpi_ac_remove(struct acpi_device *device, int type);
  62 static int acpi_ac_resume(struct acpi_device *device);
  63
  64 const static struct acpi_device_id ac_device_ids[] = {
  65         {"ACPI0003", 0},
  66         {"", 0},
  67 };
  68 MODULE_DEVICE_TABLE(acpi, ac_device_ids);
  69
  70 static struct acpi_driver acpi_ac_driver = {
  71         .name = "ac",
  72         .class = ACPI_AC_CLASS,
  73         .ids = ac_device_ids,
  74         .ops = {
  75                 .add = acpi_ac_add,
  76                 .remove = acpi_ac_remove,
  77                 .resume = acpi_ac_resume,
  78                 },
  79 };
  80
  81 struct acpi_ac {
  82         struct power_supply charger;
  83         struct acpi_device * device;
  84         unsigned long state;
  85 };
  86
  87 #define to_acpi_ac(x) container_of(x, struct acpi_ac, charger);
  88
  89 #ifdef CONFIG_ACPI_PROCFS_POWER
  90 static const struct file_operations acpi_ac_fops = {
  91         .open = acpi_ac_open_fs,
  92         .read = seq_read,
  93         .llseek = seq_lseek,
  94         .release = single_release,
  95 };
  96 #endif
  97
  98 static int get_ac_property(struct power_supply *psy,
  99                            enum power_supply_property psp,
 100                            union power_supply_propval *val)
 101 {
 102         struct acpi_ac *ac = to_acpi_ac(psy);
 103         switch (psp) {
 104         case POWER_SUPPLY_PROP_ONLINE:
 105                 val->intval = ac->state;
 106                 break;
 107         default:
 108                 return -EINVAL;
 109         }
 110         return 0;
 111 }
 112
 113 static enum power_supply_property ac_props[] = {
 114         POWER_SUPPLY_PROP_ONLINE,
 115 };
 116
 117 /* --------------------------------------------------------------------------
 118                                AC Adapter Management
 119    -------------------------------------------------------------------------- */
 120
 121 static int acpi_ac_get_state(struct acpi_ac *ac)
 122 {
 123         acpi_status status = AE_OK;
 124
 125
 126         if (!ac)
 127                 return -EINVAL;
 128
 129         status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL, &ac->state);
 130         if (ACPI_FAILURE(status)) {
 131                 ACPI_EXCEPTION((AE_INFO, status, "Error reading AC Adapter state"));
 132                 ac->state = ACPI_AC_STATUS_UNKNOWN;
 133                 return -ENODEV;
 134         }
 135
 136         return 0;
 137 }
 138
 139 #ifdef CONFIG_ACPI_PROCFS_POWER
 140 /* --------------------------------------------------------------------------
 141                               FS Interface (/proc)
 142    -------------------------------------------------------------------------- */
 143
 144 static struct proc_dir_entry *acpi_ac_dir;
 145
 146 static int acpi_ac_seq_show(struct seq_file *seq, void *offset)
 147 {
 148         struct acpi_ac *ac = seq->private;
 149
 150
 151         if (!ac)
 152                 return 0;
 153
 154         if (acpi_ac_get_state(ac)) {
 155                 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n");
 156                 return 0;
 157         }
 158
 159         seq_puts(seq, "state:                   ");
 160         switch (ac->state) {
 161         case ACPI_AC_STATUS_OFFLINE:
 162                 seq_puts(seq, "off-line\n");
 163                 break;
 164         case ACPI_AC_STATUS_ONLINE:
 165                 seq_puts(seq, "on-line\n");
 166                 break;
 167         default:
 168                 seq_puts(seq, "unknown\n");
 169                 break;
 170         }
 171
 172         return 0;
 173 }
 174
 175 static int acpi_ac_open_fs(struct inode *inode, struct file *file)
 176 {
 177         return single_open(file, acpi_ac_seq_show, PDE(inode)->data);
 178 }
 179
 180 static int acpi_ac_add_fs(struct acpi_device *device)
 181 {
 182         struct proc_dir_entry *entry = NULL;
 183
 184
 185         if (!acpi_device_dir(device)) {
 186                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 187                                                      acpi_ac_dir);
 188                 if (!acpi_device_dir(device))
 189                         return -ENODEV;
 190                 acpi_device_dir(device)->owner = THIS_MODULE;
 191         }
 192
 193         /* 'state' [R] */
 194         entry = create_proc_entry(ACPI_AC_FILE_STATE,
 195                                   S_IRUGO, acpi_device_dir(device));
 196         if (!entry)
 197                 return -ENODEV;
 198         else {
 199                 entry->proc_fops = &acpi_ac_fops;
 200                 entry->data = acpi_driver_data(device);
 201                 entry->owner = THIS_MODULE;
 202         }
 203
 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         case ACPI_AC_NOTIFY_STATUS:
 237         case ACPI_NOTIFY_BUS_CHECK:
 238         case ACPI_NOTIFY_DEVICE_CHECK:
 239                 acpi_ac_get_state(ac);
 240                 acpi_bus_generate_proc_event(device, event, (u32) ac->state);
 241                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 242                                                   device->dev.bus_id, event,
 243                                                   (u32) ac->state);
 244                 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
 245                 break;
 246         default:
 247                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 248                                   "Unsupported event [0x%x]\n", event));
 249                 break;
 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         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         status = acpi_install_notify_handler(device->handle,
 290                                              ACPI_ALL_NOTIFY, acpi_ac_notify,
 291                                              ac);
 292         if (ACPI_FAILURE(status)) {
 293                 result = -ENODEV;
 294                 goto end;
 295         }
 296
 297         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
 298                acpi_device_name(device), acpi_device_bid(device),
 299                ac->state ? "on-line" : "off-line");
 300
 301       end:
 302         if (result) {
 303 #ifdef CONFIG_ACPI_PROCFS_POWER
 304                 acpi_ac_remove_fs(device);
 305 #endif
 306                 kfree(ac);
 307         }
 308
 309         return result;
 310 }
 311
 312 static int acpi_ac_resume(struct acpi_device *device)
 313 {
 314         struct acpi_ac *ac;
 315         unsigned old_state;
 316         if (!device || !acpi_driver_data(device))
 317                 return -EINVAL;
 318         ac = acpi_driver_data(device);
 319         old_state = ac->state;
 320         if (acpi_ac_get_state(ac))
 321                 return 0;
 322         if (old_state != ac->state)
 323                 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
 324         return 0;
 325 }
 326
 327 static int acpi_ac_remove(struct acpi_device *device, int type)
 328 {
 329         acpi_status status = AE_OK;
 330         struct acpi_ac *ac = NULL;
 331
 332
 333         if (!device || !acpi_driver_data(device))
 334                 return -EINVAL;
 335
 336         ac = acpi_driver_data(device);
 337
 338         status = acpi_remove_notify_handler(device->handle,
 339                                             ACPI_ALL_NOTIFY, acpi_ac_notify);
 340         if (ac->charger.dev)
 341                 power_supply_unregister(&ac->charger);
 342 #ifdef CONFIG_ACPI_PROCFS_POWER
 343         acpi_ac_remove_fs(device);
 344 #endif
 345
 346         kfree(ac);
 347
 348         return 0;
 349 }
 350
 351 static int __init acpi_ac_init(void)
 352 {
 353         int result;
 354
 355         if (acpi_disabled)
 356                 return -ENODEV;
 357
 358 #ifdef CONFIG_ACPI_PROCFS_POWER
 359         acpi_ac_dir = acpi_lock_ac_dir();
 360         if (!acpi_ac_dir)
 361                 return -ENODEV;
 362 #endif
 363
 364         result = acpi_bus_register_driver(&acpi_ac_driver);
 365         if (result < 0) {
 366 #ifdef CONFIG_ACPI_PROCFS_POWER
 367                 acpi_unlock_ac_dir(acpi_ac_dir);
 368 #endif
 369                 return -ENODEV;
 370         }
 371
 372         return 0;
 373 }
 374
 375 static void __exit acpi_ac_exit(void)
 376 {
 377
 378         acpi_bus_unregister_driver(&acpi_ac_driver);
 379
 380 #ifdef CONFIG_ACPI_PROCFS_POWER
 381         acpi_unlock_ac_dir(acpi_ac_dir);
 382 #endif
 383
 384         return;
 385 }
 386
 387 module_init(acpi_ac_init);
 388 module_exit(acpi_ac_exit);