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 #include <linux/dmi.h>
  32 #include <linux/delay.h>
  33 #ifdef CONFIG_ACPI_PROCFS_POWER
  34 #include <linux/proc_fs.h>
  35 #include <linux/seq_file.h>
  36 #endif
  37 #include <linux/power_supply.h>
  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);
  66 static void acpi_ac_notify(struct acpi_device *device, u32 event);
  67
  68 static const struct acpi_device_id ac_device_ids[] = {
  69         {"ACPI0003", 0},
  70         {"", 0},
  71 };
  72 MODULE_DEVICE_TABLE(acpi, ac_device_ids);
  73
  74 #ifdef CONFIG_PM_SLEEP
  75 static int acpi_ac_resume(struct device *dev);
  76 #endif
  77 static SIMPLE_DEV_PM_OPS(acpi_ac_pm, NULL, acpi_ac_resume);
  78
  79 static int ac_sleep_before_get_state_ms;
  80
  81 static struct acpi_driver acpi_ac_driver = {
  82         .name = "ac",
  83         .class = ACPI_AC_CLASS,
  84         .ids = ac_device_ids,
  85         .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
  86         .ops = {
  87                 .add = acpi_ac_add,
  88                 .remove = acpi_ac_remove,
  89                 .notify = acpi_ac_notify,
  90                 },
  91         .drv.pm = &acpi_ac_pm,
  92 };
  93
  94 struct acpi_ac {
  95         struct power_supply charger;
  96         struct acpi_device * device;
  97         unsigned long long state;
  98 };
  99
 100 #define to_acpi_ac(x) container_of(x, struct acpi_ac, charger)
 101
 102 #ifdef CONFIG_ACPI_PROCFS_POWER
 103 static const struct file_operations acpi_ac_fops = {
 104         .owner = THIS_MODULE,
 105         .open = acpi_ac_open_fs,
 106         .read = seq_read,
 107         .llseek = seq_lseek,
 108         .release = single_release,
 109 };
 110 #endif
 111
 112 /* --------------------------------------------------------------------------
 113                                AC Adapter Management
 114    -------------------------------------------------------------------------- */
 115
 116 static int acpi_ac_get_state(struct acpi_ac *ac)
 117 {
 118         acpi_status status = AE_OK;
 119
 120
 121         if (!ac)
 122                 return -EINVAL;
 123
 124         status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL, &ac->state);
 125         if (ACPI_FAILURE(status)) {
 126                 ACPI_EXCEPTION((AE_INFO, status, "Error reading AC Adapter state"));
 127                 ac->state = ACPI_AC_STATUS_UNKNOWN;
 128                 return -ENODEV;
 129         }
 130
 131         return 0;
 132 }
 133
 134 /* --------------------------------------------------------------------------
 135                             sysfs I/F
 136    -------------------------------------------------------------------------- */
 137 static int get_ac_property(struct power_supply *psy,
 138                            enum power_supply_property psp,
 139                            union power_supply_propval *val)
 140 {
 141         struct acpi_ac *ac = to_acpi_ac(psy);
 142
 143         if (!ac)
 144                 return -ENODEV;
 145
 146         if (acpi_ac_get_state(ac))
 147                 return -ENODEV;
 148
 149         switch (psp) {
 150         case POWER_SUPPLY_PROP_ONLINE:
 151                 val->intval = ac->state;
 152                 break;
 153         default:
 154                 return -EINVAL;
 155         }
 156         return 0;
 157 }
 158
 159 static enum power_supply_property ac_props[] = {
 160         POWER_SUPPLY_PROP_ONLINE,
 161 };
 162
 163 #ifdef CONFIG_ACPI_PROCFS_POWER
 164 /* --------------------------------------------------------------------------
 165                               FS Interface (/proc)
 166    -------------------------------------------------------------------------- */
 167
 168 static struct proc_dir_entry *acpi_ac_dir;
 169
 170 static int acpi_ac_seq_show(struct seq_file *seq, void *offset)
 171 {
 172         struct acpi_ac *ac = seq->private;
 173
 174
 175         if (!ac)
 176                 return 0;
 177
 178         if (acpi_ac_get_state(ac)) {
 179                 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n");
 180                 return 0;
 181         }
 182
 183         seq_puts(seq, "state:                   ");
 184         switch (ac->state) {
 185         case ACPI_AC_STATUS_OFFLINE:
 186                 seq_puts(seq, "off-line\n");
 187                 break;
 188         case ACPI_AC_STATUS_ONLINE:
 189                 seq_puts(seq, "on-line\n");
 190                 break;
 191         default:
 192                 seq_puts(seq, "unknown\n");
 193                 break;
 194         }
 195
 196         return 0;
 197 }
 198
 199 static int acpi_ac_open_fs(struct inode *inode, struct file *file)
 200 {
 201         return single_open(file, acpi_ac_seq_show, PDE_DATA(inode));
 202 }
 203
 204 static int acpi_ac_add_fs(struct acpi_device *device)
 205 {
 206         struct proc_dir_entry *entry = NULL;
 207
 208         printk(KERN_WARNING PREFIX "Deprecated procfs I/F for AC is loaded,"
 209                         " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n");
 210         if (!acpi_device_dir(device)) {
 211                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 212                                                      acpi_ac_dir);
 213                 if (!acpi_device_dir(device))
 214                         return -ENODEV;
 215         }
 216
 217         /* 'state' [R] */
 218         entry = proc_create_data(ACPI_AC_FILE_STATE,
 219                                  S_IRUGO, acpi_device_dir(device),
 220                                  &acpi_ac_fops, acpi_driver_data(device));
 221         if (!entry)
 222                 return -ENODEV;
 223         return 0;
 224 }
 225
 226 static int acpi_ac_remove_fs(struct acpi_device *device)
 227 {
 228
 229         if (acpi_device_dir(device)) {
 230                 remove_proc_entry(ACPI_AC_FILE_STATE, acpi_device_dir(device));
 231
 232                 remove_proc_entry(acpi_device_bid(device), acpi_ac_dir);
 233                 acpi_device_dir(device) = NULL;
 234         }
 235
 236         return 0;
 237 }
 238 #endif
 239
 240 /* --------------------------------------------------------------------------
 241                                    Driver Model
 242    -------------------------------------------------------------------------- */
 243
 244 static void acpi_ac_notify(struct acpi_device *device, u32 event)
 245 {
 246         struct acpi_ac *ac = acpi_driver_data(device);
 247
 248
 249         if (!ac)
 250                 return;
 251
 252         switch (event) {
 253         default:
 254                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 255                                   "Unsupported event [0x%x]\n", event));
 256         case ACPI_AC_NOTIFY_STATUS:
 257         case ACPI_NOTIFY_BUS_CHECK:
 258         case ACPI_NOTIFY_DEVICE_CHECK:
 259                 /*
 260                  * A buggy BIOS may notify AC first and then sleep for
 261                  * a specific time before doing actual operations in the
 262                  * EC event handler (_Qxx). This will cause the AC state
 263                  * reported by the ACPI event to be incorrect, so wait for a
 264                  * specific time for the EC event handler to make progress.
 265                  */
 266                 if (ac_sleep_before_get_state_ms > 0)
 267                         msleep(ac_sleep_before_get_state_ms);
 268
 269                 acpi_ac_get_state(ac);
 270                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 271                                                   dev_name(&device->dev), event,
 272                                                   (u32) ac->state);
 273                 acpi_notifier_call_chain(device, event, (u32) ac->state);
 274                 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
 275         }
 276
 277         return;
 278 }
 279
 280 static int thinkpad_e530_quirk(const struct dmi_system_id *d)
 281 {
 282         ac_sleep_before_get_state_ms = 1000;
 283         return 0;
 284 }
 285
 286 static struct dmi_system_id ac_dmi_table[] = {
 287         {
 288         .callback = thinkpad_e530_quirk,
 289         .ident = "thinkpad e530",
 290         .matches = {
 291                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 292                 DMI_MATCH(DMI_PRODUCT_NAME, "32597CG"),
 293                 },
 294         },
 295         {},
 296 };
 297
 298 static int acpi_ac_add(struct acpi_device *device)
 299 {
 300         int result = 0;
 301         struct acpi_ac *ac = NULL;
 302
 303
 304         if (!device)
 305                 return -EINVAL;
 306
 307         ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
 308         if (!ac)
 309                 return -ENOMEM;
 310
 311         ac->device = device;
 312         strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
 313         strcpy(acpi_device_class(device), ACPI_AC_CLASS);
 314         device->driver_data = ac;
 315
 316         result = acpi_ac_get_state(ac);
 317         if (result)
 318                 goto end;
 319
 320 #ifdef CONFIG_ACPI_PROCFS_POWER
 321         result = acpi_ac_add_fs(device);
 322 #endif
 323         if (result)
 324                 goto end;
 325         ac->charger.name = acpi_device_bid(device);
 326         ac->charger.type = POWER_SUPPLY_TYPE_MAINS;
 327         ac->charger.properties = ac_props;
 328         ac->charger.num_properties = ARRAY_SIZE(ac_props);
 329         ac->charger.get_property = get_ac_property;
 330         result = power_supply_register(&ac->device->dev, &ac->charger);
 331         if (result)
 332                 goto end;
 333
 334         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
 335                acpi_device_name(device), acpi_device_bid(device),
 336                ac->state ? "on-line" : "off-line");
 337
 338       end:
 339         if (result) {
 340 #ifdef CONFIG_ACPI_PROCFS_POWER
 341                 acpi_ac_remove_fs(device);
 342 #endif
 343                 kfree(ac);
 344         }
 345
 346         dmi_check_system(ac_dmi_table);
 347         return result;
 348 }
 349
 350 #ifdef CONFIG_PM_SLEEP
 351 static int acpi_ac_resume(struct device *dev)
 352 {
 353         struct acpi_ac *ac;
 354         unsigned old_state;
 355
 356         if (!dev)
 357                 return -EINVAL;
 358
 359         ac = acpi_driver_data(to_acpi_device(dev));
 360         if (!ac)
 361                 return -EINVAL;
 362
 363         old_state = ac->state;
 364         if (acpi_ac_get_state(ac))
 365                 return 0;
 366         if (old_state != ac->state)
 367                 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
 368         return 0;
 369 }
 370 #endif
 371
 372 static int acpi_ac_remove(struct acpi_device *device)
 373 {
 374         struct acpi_ac *ac = NULL;
 375
 376
 377         if (!device || !acpi_driver_data(device))
 378                 return -EINVAL;
 379
 380         ac = acpi_driver_data(device);
 381
 382         if (ac->charger.dev)
 383                 power_supply_unregister(&ac->charger);
 384 #ifdef CONFIG_ACPI_PROCFS_POWER
 385         acpi_ac_remove_fs(device);
 386 #endif
 387
 388         kfree(ac);
 389
 390         return 0;
 391 }
 392
 393 static int __init acpi_ac_init(void)
 394 {
 395         int result;
 396
 397         if (acpi_disabled)
 398                 return -ENODEV;
 399
 400 #ifdef CONFIG_ACPI_PROCFS_POWER
 401         acpi_ac_dir = acpi_lock_ac_dir();
 402         if (!acpi_ac_dir)
 403                 return -ENODEV;
 404 #endif
 405
 406         result = acpi_bus_register_driver(&acpi_ac_driver);
 407         if (result < 0) {
 408 #ifdef CONFIG_ACPI_PROCFS_POWER
 409                 acpi_unlock_ac_dir(acpi_ac_dir);
 410 #endif
 411                 return -ENODEV;
 412         }
 413
 414         return 0;
 415 }
 416
 417 static void __exit acpi_ac_exit(void)
 418 {
 419
 420         acpi_bus_unregister_driver(&acpi_ac_driver);
 421
 422 #ifdef CONFIG_ACPI_PROCFS_POWER
 423         acpi_unlock_ac_dir(acpi_ac_dir);
 424 #endif
 425
 426         return;
 427 }
 428
 429 module_init(acpi_ac_init);
 430 module_exit(acpi_ac_exit);