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/platform_device.h>
  38 #include <linux/power_supply.h>
  39 #include <acpi/acpi_bus.h>
  40 #include <acpi/acpi_drivers.h>
  41
  42 #define PREFIX "ACPI: "
  43
  44 #define ACPI_AC_CLASS                   "ac_adapter"
  45 #define ACPI_AC_DEVICE_NAME             "AC Adapter"
  46 #define ACPI_AC_FILE_STATE              "state"
  47 #define ACPI_AC_NOTIFY_STATUS           0x80
  48 #define ACPI_AC_STATUS_OFFLINE          0x00
  49 #define ACPI_AC_STATUS_ONLINE           0x01
  50 #define ACPI_AC_STATUS_UNKNOWN          0xFF
  51
  52 #define _COMPONENT              ACPI_AC_COMPONENT
  53 ACPI_MODULE_NAME("ac");
  54
  55 MODULE_AUTHOR("Paul Diefenbaugh");
  56 MODULE_DESCRIPTION("ACPI AC Adapter Driver");
  57 MODULE_LICENSE("GPL");
  58
  59 #ifdef CONFIG_ACPI_PROCFS_POWER
  60 extern struct proc_dir_entry *acpi_lock_ac_dir(void);
  61 extern void *acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);
  62 static int acpi_ac_open_fs(struct inode *inode, struct file *file);
  63 #endif
  64
  65 static int ac_sleep_before_get_state_ms;
  66
  67 struct acpi_ac {
  68         struct power_supply charger;
  69         struct acpi_device *adev;
  70         struct platform_device *pdev;
  71         unsigned long long state;
  72 };
  73
  74 #define to_acpi_ac(x) container_of(x, struct acpi_ac, charger)
  75
  76 #ifdef CONFIG_ACPI_PROCFS_POWER
  77 static const struct file_operations acpi_ac_fops = {
  78         .owner = THIS_MODULE,
  79         .open = acpi_ac_open_fs,
  80         .read = seq_read,
  81         .llseek = seq_lseek,
  82         .release = single_release,
  83 };
  84 #endif
  85
  86 /* --------------------------------------------------------------------------
  87                                AC Adapter Management
  88    -------------------------------------------------------------------------- */
  89
  90 static int acpi_ac_get_state(struct acpi_ac *ac)
  91 {
  92         acpi_status status;
  93
  94         status = acpi_evaluate_integer(ac->adev->handle, "_PSR", NULL,
  95                                        &ac->state);
  96         if (ACPI_FAILURE(status)) {
  97                 ACPI_EXCEPTION((AE_INFO, status,
  98                                 "Error reading AC Adapter state"));
  99                 ac->state = ACPI_AC_STATUS_UNKNOWN;
 100                 return -ENODEV;
 101         }
 102
 103         return 0;
 104 }
 105
 106 /* --------------------------------------------------------------------------
 107                             sysfs I/F
 108    -------------------------------------------------------------------------- */
 109 static int get_ac_property(struct power_supply *psy,
 110                            enum power_supply_property psp,
 111                            union power_supply_propval *val)
 112 {
 113         struct acpi_ac *ac = to_acpi_ac(psy);
 114
 115         if (!ac)
 116                 return -ENODEV;
 117
 118         if (acpi_ac_get_state(ac))
 119                 return -ENODEV;
 120
 121         switch (psp) {
 122         case POWER_SUPPLY_PROP_ONLINE:
 123                 val->intval = ac->state;
 124                 break;
 125         default:
 126                 return -EINVAL;
 127         }
 128         return 0;
 129 }
 130
 131 static enum power_supply_property ac_props[] = {
 132         POWER_SUPPLY_PROP_ONLINE,
 133 };
 134
 135 #ifdef CONFIG_ACPI_PROCFS_POWER
 136 /* --------------------------------------------------------------------------
 137                               FS Interface (/proc)
 138    -------------------------------------------------------------------------- */
 139
 140 static struct proc_dir_entry *acpi_ac_dir;
 141
 142 static int acpi_ac_seq_show(struct seq_file *seq, void *offset)
 143 {
 144         struct acpi_ac *ac = seq->private;
 145
 146
 147         if (!ac)
 148                 return 0;
 149
 150         if (acpi_ac_get_state(ac)) {
 151                 seq_puts(seq, "ERROR: Unable to read AC Adapter state\n");
 152                 return 0;
 153         }
 154
 155         seq_puts(seq, "state:                   ");
 156         switch (ac->state) {
 157         case ACPI_AC_STATUS_OFFLINE:
 158                 seq_puts(seq, "off-line\n");
 159                 break;
 160         case ACPI_AC_STATUS_ONLINE:
 161                 seq_puts(seq, "on-line\n");
 162                 break;
 163         default:
 164                 seq_puts(seq, "unknown\n");
 165                 break;
 166         }
 167
 168         return 0;
 169 }
 170
 171 static int acpi_ac_open_fs(struct inode *inode, struct file *file)
 172 {
 173         return single_open(file, acpi_ac_seq_show, PDE_DATA(inode));
 174 }
 175
 176 static int acpi_ac_add_fs(struct acpi_ac *ac)
 177 {
 178         struct proc_dir_entry *entry = NULL;
 179
 180         printk(KERN_WARNING PREFIX "Deprecated procfs I/F for AC is loaded,"
 181                         " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n");
 182         if (!acpi_device_dir(ac->adev)) {
 183                 acpi_device_dir(ac->adev) =
 184                         proc_mkdir(acpi_device_bid(ac->adev), acpi_ac_dir);
 185                 if (!acpi_device_dir(ac->adev))
 186                         return -ENODEV;
 187         }
 188
 189         /* 'state' [R] */
 190         entry = proc_create_data(ACPI_AC_FILE_STATE,
 191                                  S_IRUGO, acpi_device_dir(ac->adev),
 192                                  &acpi_ac_fops, ac);
 193         if (!entry)
 194                 return -ENODEV;
 195         return 0;
 196 }
 197
 198 static int acpi_ac_remove_fs(struct acpi_ac *ac)
 199 {
 200
 201         if (acpi_device_dir(ac->adev)) {
 202                 remove_proc_entry(ACPI_AC_FILE_STATE,
 203                                   acpi_device_dir(ac->adev));
 204                 remove_proc_entry(acpi_device_bid(ac->adev), acpi_ac_dir);
 205                 acpi_device_dir(ac->adev) = NULL;
 206         }
 207
 208         return 0;
 209 }
 210 #endif
 211
 212 /* --------------------------------------------------------------------------
 213                                    Driver Model
 214    -------------------------------------------------------------------------- */
 215
 216 static void acpi_ac_notify_handler(acpi_handle handle, u32 event, void *data)
 217 {
 218         struct acpi_ac *ac = data;
 219
 220         if (!ac)
 221                 return;
 222
 223         switch (event) {
 224         default:
 225                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 226                                   "Unsupported event [0x%x]\n", event));
 227         case ACPI_AC_NOTIFY_STATUS:
 228         case ACPI_NOTIFY_BUS_CHECK:
 229         case ACPI_NOTIFY_DEVICE_CHECK:
 230                 /*
 231                  * A buggy BIOS may notify AC first and then sleep for
 232                  * a specific time before doing actual operations in the
 233                  * EC event handler (_Qxx). This will cause the AC state
 234                  * reported by the ACPI event to be incorrect, so wait for a
 235                  * specific time for the EC event handler to make progress.
 236                  */
 237                 if (ac_sleep_before_get_state_ms > 0)
 238                         msleep(ac_sleep_before_get_state_ms);
 239
 240                 acpi_ac_get_state(ac);
 241                 acpi_bus_generate_netlink_event(ac->adev->pnp.device_class,
 242                                                 dev_name(&ac->pdev->dev),
 243                                                 event, (u32) ac->state);
 244                 acpi_notifier_call_chain(ac->adev, event, (u32) ac->state);
 245                 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
 246         }
 247
 248         return;
 249 }
 250
 251 static int thinkpad_e530_quirk(const struct dmi_system_id *d)
 252 {
 253         ac_sleep_before_get_state_ms = 1000;
 254         return 0;
 255 }
 256
 257 static struct dmi_system_id ac_dmi_table[] = {
 258         {
 259         .callback = thinkpad_e530_quirk,
 260         .ident = "thinkpad e530",
 261         .matches = {
 262                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 263                 DMI_MATCH(DMI_PRODUCT_NAME, "32597CG"),
 264                 },
 265         },
 266         {},
 267 };
 268
 269 static int acpi_ac_probe(struct platform_device *pdev)
 270 {
 271         int result = 0;
 272         struct acpi_ac *ac = NULL;
 273         struct acpi_device *adev;
 274
 275         if (!pdev)
 276                 return -EINVAL;
 277
 278         result = acpi_bus_get_device(ACPI_HANDLE(&pdev->dev), &adev);
 279         if (result)
 280                 return -ENODEV;
 281
 282         ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
 283         if (!ac)
 284                 return -ENOMEM;
 285
 286         strcpy(acpi_device_name(adev), ACPI_AC_DEVICE_NAME);
 287         strcpy(acpi_device_class(adev), ACPI_AC_CLASS);
 288         ac->adev = adev;
 289         ac->pdev = pdev;
 290         platform_set_drvdata(pdev, ac);
 291
 292         result = acpi_ac_get_state(ac);
 293         if (result)
 294                 goto end;
 295
 296 #ifdef CONFIG_ACPI_PROCFS_POWER
 297         result = acpi_ac_add_fs(ac);
 298         if (result)
 299                 goto end;
 300 #endif
 301         ac->charger.name = acpi_device_bid(adev);
 302         ac->charger.type = POWER_SUPPLY_TYPE_MAINS;
 303         ac->charger.properties = ac_props;
 304         ac->charger.num_properties = ARRAY_SIZE(ac_props);
 305         ac->charger.get_property = get_ac_property;
 306         result = power_supply_register(&pdev->dev, &ac->charger);
 307         if (result)
 308                 goto end;
 309
 310         result = acpi_install_notify_handler(ACPI_HANDLE(&pdev->dev),
 311                         ACPI_DEVICE_NOTIFY, acpi_ac_notify_handler, ac);
 312         if (result) {
 313                 power_supply_unregister(&ac->charger);
 314                 goto end;
 315         }
 316         printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
 317                acpi_device_name(adev), acpi_device_bid(adev),
 318                ac->state ? "on-line" : "off-line");
 319
 320       end:
 321         if (result) {
 322 #ifdef CONFIG_ACPI_PROCFS_POWER
 323                 acpi_ac_remove_fs(ac);
 324 #endif
 325                 kfree(ac);
 326         }
 327
 328         dmi_check_system(ac_dmi_table);
 329         return result;
 330 }
 331
 332 #ifdef CONFIG_PM_SLEEP
 333 static int acpi_ac_resume(struct device *dev)
 334 {
 335         struct acpi_ac *ac;
 336         unsigned old_state;
 337
 338         if (!dev)
 339                 return -EINVAL;
 340
 341         ac = platform_get_drvdata(to_platform_device(dev));
 342         if (!ac)
 343                 return -EINVAL;
 344
 345         old_state = ac->state;
 346         if (acpi_ac_get_state(ac))
 347                 return 0;
 348         if (old_state != ac->state)
 349                 kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
 350         return 0;
 351 }
 352 #endif
 353 static SIMPLE_DEV_PM_OPS(acpi_ac_pm_ops, NULL, acpi_ac_resume);
 354
 355 static int acpi_ac_remove(struct platform_device *pdev)
 356 {
 357         struct acpi_ac *ac;
 358
 359         if (!pdev)
 360                 return -EINVAL;
 361
 362         acpi_remove_notify_handler(ACPI_HANDLE(&pdev->dev),
 363                         ACPI_DEVICE_NOTIFY, acpi_ac_notify_handler);
 364
 365         ac = platform_get_drvdata(pdev);
 366         if (ac->charger.dev)
 367                 power_supply_unregister(&ac->charger);
 368
 369 #ifdef CONFIG_ACPI_PROCFS_POWER
 370         acpi_ac_remove_fs(ac);
 371 #endif
 372
 373         kfree(ac);
 374
 375         return 0;
 376 }
 377
 378 static const struct acpi_device_id acpi_ac_match[] = {
 379         { "ACPI0003", 0 },
 380         { }
 381 };
 382 MODULE_DEVICE_TABLE(acpi, acpi_ac_match);
 383
 384 static struct platform_driver acpi_ac_driver = {
 385         .probe          = acpi_ac_probe,
 386         .remove         = acpi_ac_remove,
 387         .driver         = {
 388                 .name   = "acpi-ac",
 389                 .owner  = THIS_MODULE,
 390                 .pm     = &acpi_ac_pm_ops,
 391                 .acpi_match_table = ACPI_PTR(acpi_ac_match),
 392         },
 393 };
 394
 395 static int __init acpi_ac_init(void)
 396 {
 397         int result;
 398
 399         if (acpi_disabled)
 400                 return -ENODEV;
 401
 402 #ifdef CONFIG_ACPI_PROCFS_POWER
 403         acpi_ac_dir = acpi_lock_ac_dir();
 404         if (!acpi_ac_dir)
 405                 return -ENODEV;
 406 #endif
 407
 408         result = platform_driver_register(&acpi_ac_driver);
 409         if (result < 0) {
 410 #ifdef CONFIG_ACPI_PROCFS_POWER
 411                 acpi_unlock_ac_dir(acpi_ac_dir);
 412 #endif
 413                 return -ENODEV;
 414         }
 415
 416         return 0;
 417 }
 418
 419 static void __exit acpi_ac_exit(void)
 420 {
 421         platform_driver_unregister(&acpi_ac_driver);
 422 #ifdef CONFIG_ACPI_PROCFS_POWER
 423         acpi_unlock_ac_dir(acpi_ac_dir);
 424 #endif
 425 }
 426 module_init(acpi_ac_init);
 427 module_exit(acpi_ac_exit);