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   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
  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
  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
  63 const static struct acpi_device_id ac_device_ids[] = {
  64         {"ACPI0003", 0},
  65         {"", 0},
  66 };
  67 MODULE_DEVICE_TABLE(acpi, ac_device_ids);
  68
  69 static struct acpi_driver acpi_ac_driver = {
  70         .name = "ac",
  71         .class = ACPI_AC_CLASS,
  72         .ids = ac_device_ids,
  73         .ops = {
  74                 .add = acpi_ac_add,
  75                 .remove = acpi_ac_remove,
  76                 },
  77 };
  78
  79 struct acpi_ac {
  80         struct power_supply charger;
  81         struct acpi_device * device;
  82         unsigned long state;
  83 };
  84
  85 #define to_acpi_ac(x) container_of(x, struct acpi_ac, charger);
  86
  87 #ifdef CONFIG_ACPI_PROCFS
  88 static const struct file_operations acpi_ac_fops = {
  89         .open = acpi_ac_open_fs,
  90         .read = seq_read,
  91         .llseek = seq_lseek,
  92         .release = single_release,
  93 };
  94 #endif
  95
  96 static int get_ac_property(struct power_supply *psy,
  97                            enum power_supply_property psp,
  98                            union power_supply_propval *val)
  99 {
 100         struct acpi_ac *ac = to_acpi_ac(psy);
 101         switch (psp) {
 102         case POWER_SUPPLY_PROP_ONLINE:
 103                 val->intval = ac->state;
 104                 break;
 105         default:
 106                 return -EINVAL;
 107         }
 108         return 0;
 109 }
 110
 111 static enum power_supply_property ac_props[] = {
 112         POWER_SUPPLY_PROP_ONLINE,
 113 };
 114
 115 /* --------------------------------------------------------------------------
 116                                AC Adapter Management
 117    -------------------------------------------------------------------------- */
 118
 119 static int acpi_ac_get_state(struct acpi_ac *ac)
 120 {
 121         acpi_status status = AE_OK;
 122
 123
 124         if (!ac)
 125                 return -EINVAL;
 126
 127         status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL, &ac->state);
 128         if (ACPI_FAILURE(status)) {
 129                 ACPI_EXCEPTION((AE_INFO, status, "Error reading AC Adapter state"));
 130                 ac->state = ACPI_AC_STATUS_UNKNOWN;
 131                 return -ENODEV;
 132         }
 133
 134         return 0;
 135 }
 136
 137 #ifdef CONFIG_ACPI_PROCFS
 138 /* --------------------------------------------------------------------------
 139                               FS Interface (/proc)
 140    -------------------------------------------------------------------------- */
 141
 142 static struct proc_dir_entry *acpi_ac_dir;
 143
 144 static int acpi_ac_seq_show(struct seq_file *seq, void *offset)
 145 {
 146         struct acpi_ac *ac = seq->private;
 147
 148
 149         if (!ac)
 150                 return 0;
 151
 152         if (acpi_ac_get_state(ac)) {
 153                 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n");
 154                 return 0;
 155         }
 156
 157         seq_puts(seq, "state:                   ");
 158         switch (ac->state) {
 159         case ACPI_AC_STATUS_OFFLINE:
 160                 seq_puts(seq, "off-line\n");
 161                 break;
 162         case ACPI_AC_STATUS_ONLINE:
 163                 seq_puts(seq, "on-line\n");
 164                 break;
 165         default:
 166                 seq_puts(seq, "unknown\n");
 167                 break;
 168         }
 169
 170         return 0;
 171 }
 172
 173 static int acpi_ac_open_fs(struct inode *inode, struct file *file)
 174 {
 175         return single_open(file, acpi_ac_seq_show, PDE(inode)->data);
 176 }
 177
 178 static int acpi_ac_add_fs(struct acpi_device *device)
 179 {
 180         struct proc_dir_entry *entry = NULL;
 181
 182
 183         if (!acpi_device_dir(device)) {
 184                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 185                                                      acpi_ac_dir);
 186                 if (!acpi_device_dir(device))
 187                         return -ENODEV;
 188                 acpi_device_dir(device)->owner = THIS_MODULE;
 189         }
 190
 191         /* 'state' [R] */
 192         entry = create_proc_entry(ACPI_AC_FILE_STATE,
 193                                   S_IRUGO, acpi_device_dir(device));
 194         if (!entry)
 195                 return -ENODEV;
 196         else {
 197                 entry->proc_fops = &acpi_ac_fops;
 198                 entry->data = acpi_driver_data(device);
 199                 entry->owner = THIS_MODULE;
 200         }
 201
 202         return 0;
 203 }
 204
 205 static int acpi_ac_remove_fs(struct acpi_device *device)
 206 {
 207
 208         if (acpi_device_dir(device)) {
 209                 remove_proc_entry(ACPI_AC_FILE_STATE, acpi_device_dir(device));
 210
 211                 remove_proc_entry(acpi_device_bid(device), acpi_ac_dir);
 212                 acpi_device_dir(device) = NULL;
 213         }
 214
 215         return 0;
 216 }
 217 #endif
 218
 219 /* --------------------------------------------------------------------------
 220                                    Driver Model
 221    -------------------------------------------------------------------------- */
 222
 223 static void acpi_ac_notify(acpi_handle handle, u32 event, void *data)
 224 {
 225         struct acpi_ac *ac = data;
 226         struct acpi_device *device = NULL;
 227
 228
 229         if (!ac)
 230                 return;
 231
 232         device = ac->device;
 233         switch (event) {
 234         case ACPI_AC_NOTIFY_STATUS:
 235         case ACPI_NOTIFY_BUS_CHECK:
 236         case ACPI_NOTIFY_DEVICE_CHECK:
 237                 acpi_ac_get_state(ac);
 238                 acpi_bus_generate_proc_event(device, event, (u32) ac->state);
 239                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 240                                                   device->dev.bus_id, event,
 241                                                   (u32) ac->state);
 242                 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
 243                 break;
 244         default:
 245                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 246                                   "Unsupported event [0x%x]\n", event));
 247                 break;
 248         }
 249
 250         return;
 251 }
 252
 253 static int acpi_ac_add(struct acpi_device *device)
 254 {
 255         int result = 0;
 256         acpi_status status = AE_OK;
 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         acpi_driver_data(device) = ac;
 271
 272         result = acpi_ac_get_state(ac);
 273         if (result)
 274                 goto end;
 275
 276 #ifdef CONFIG_ACPI_PROCFS
 277         result = acpi_ac_add_fs(device);
 278 #endif
 279         if (result)
 280                 goto end;
 281         ac->charger.name = acpi_device_bid(device);
 282         ac->charger.type = POWER_SUPPLY_TYPE_MAINS;
 283         ac->charger.properties = ac_props;
 284         ac->charger.num_properties = ARRAY_SIZE(ac_props);
 285         ac->charger.get_property = get_ac_property;
 286         power_supply_register(&ac->device->dev, &ac->charger);
 287         status = acpi_install_notify_handler(device->handle,
 288                                              ACPI_ALL_NOTIFY, acpi_ac_notify,
 289                                              ac);
 290         if (ACPI_FAILURE(status)) {
 291                 result = -ENODEV;
 292                 goto end;
 293         }
 294
 295         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
 296                acpi_device_name(device), acpi_device_bid(device),
 297                ac->state ? "on-line" : "off-line");
 298
 299       end:
 300         if (result) {
 301 #ifdef CONFIG_ACPI_PROCFS
 302                 acpi_ac_remove_fs(device);
 303 #endif
 304                 kfree(ac);
 305         }
 306
 307         return result;
 308 }
 309
 310 static int acpi_ac_remove(struct acpi_device *device, int type)
 311 {
 312         acpi_status status = AE_OK;
 313         struct acpi_ac *ac = NULL;
 314
 315
 316         if (!device || !acpi_driver_data(device))
 317                 return -EINVAL;
 318
 319         ac = acpi_driver_data(device);
 320
 321         status = acpi_remove_notify_handler(device->handle,
 322                                             ACPI_ALL_NOTIFY, acpi_ac_notify);
 323         if (ac->charger.dev)
 324                 power_supply_unregister(&ac->charger);
 325 #ifdef CONFIG_ACPI_PROCFS
 326         acpi_ac_remove_fs(device);
 327 #endif
 328
 329         kfree(ac);
 330
 331         return 0;
 332 }
 333
 334 static int __init acpi_ac_init(void)
 335 {
 336         int result;
 337
 338         if (acpi_disabled)
 339                 return -ENODEV;
 340
 341 #ifdef CONFIG_ACPI_PROCFS
 342         acpi_ac_dir = acpi_lock_ac_dir();
 343         if (!acpi_ac_dir)
 344                 return -ENODEV;
 345 #endif
 346
 347         result = acpi_bus_register_driver(&acpi_ac_driver);
 348         if (result < 0) {
 349 #ifdef CONFIG_ACPI_PROCFS
 350                 acpi_unlock_ac_dir(acpi_ac_dir);
 351 #endif
 352                 return -ENODEV;
 353         }
 354
 355         return 0;
 356 }
 357
 358 static void __exit acpi_ac_exit(void)
 359 {
 360
 361         acpi_bus_unregister_driver(&acpi_ac_driver);
 362
 363 #ifdef CONFIG_ACPI_PROCFS
 364         acpi_unlock_ac_dir(acpi_ac_dir);
 365 #endif
 366
 367         return;
 368 }
 369
 370 module_init(acpi_ac_init);
 371 module_exit(acpi_ac_exit);