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ac.c

/*
 *  acpi_ac.c - ACPI AC Adapter Driver ($Revision: 27 $)
 *
 *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
 *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or (at
 *  your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful, but
 *  WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#ifdef CONFIG_ACPI_PROCFS_POWER
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#endif
#ifdef CONFIG_ACPI_SYSFS_POWER
#include <linux/power_supply.h>
#endif
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>

#define ACPI_AC_COMPONENT           0x00020000
#define ACPI_AC_CLASS               "ac_adapter"
#define ACPI_AC_DEVICE_NAME         "AC Adapter"
#define ACPI_AC_FILE_STATE          "state"
#define ACPI_AC_NOTIFY_STATUS       0x80
#define ACPI_AC_STATUS_OFFLINE            0x00
#define ACPI_AC_STATUS_ONLINE       0x01
#define ACPI_AC_STATUS_UNKNOWN            0xFF

#define _COMPONENT            ACPI_AC_COMPONENT
ACPI_MODULE_NAME("ac");

MODULE_AUTHOR("Paul Diefenbaugh");
MODULE_DESCRIPTION("ACPI AC Adapter Driver");
MODULE_LICENSE("GPL");

#ifdef CONFIG_ACPI_PROCFS_POWER
extern struct proc_dir_entry *acpi_lock_ac_dir(void);
extern void *acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir);
static int acpi_ac_open_fs(struct inode *inode, struct file *file);
#endif

static int acpi_ac_add(struct acpi_device *device);
static int acpi_ac_remove(struct acpi_device *device, int type);
static int acpi_ac_resume(struct acpi_device *device);

const static struct acpi_device_id ac_device_ids[] = {
      {"ACPI0003", 0},
      {"", 0},
};
MODULE_DEVICE_TABLE(acpi, ac_device_ids);

static struct acpi_driver acpi_ac_driver = {
      .name = "ac",
      .class = ACPI_AC_CLASS,
      .ids = ac_device_ids,
      .ops = {
            .add = acpi_ac_add,
            .remove = acpi_ac_remove,
            .resume = acpi_ac_resume,
            },
};

struct acpi_ac {
#ifdef CONFIG_ACPI_SYSFS_POWER
      struct power_supply charger;
#endif
      struct acpi_device * device;
      unsigned long state;
};

#define to_acpi_ac(x) container_of(x, struct acpi_ac, charger);

#ifdef CONFIG_ACPI_PROCFS_POWER
static const struct file_operations acpi_ac_fops = {
      .open = acpi_ac_open_fs,
      .read = seq_read,
      .llseek = seq_lseek,
      .release = single_release,
};
#endif
#ifdef CONFIG_ACPI_SYSFS_POWER
static int get_ac_property(struct power_supply *psy,
                     enum power_supply_property psp,
                     union power_supply_propval *val)
{
      struct acpi_ac *ac = to_acpi_ac(psy);
      switch (psp) {
      case POWER_SUPPLY_PROP_ONLINE:
            val->intval = ac->state;
            break;
      default:
            return -EINVAL;
      }
      return 0;
}

static enum power_supply_property ac_props[] = {
      POWER_SUPPLY_PROP_ONLINE,
};
#endif
/* --------------------------------------------------------------------------
                               AC Adapter Management
   -------------------------------------------------------------------------- */

static int acpi_ac_get_state(struct acpi_ac *ac)
{
      acpi_status status = AE_OK;


      if (!ac)
            return -EINVAL;

      status = acpi_evaluate_integer(ac->device->handle, "_PSR", NULL, &ac->state);
      if (ACPI_FAILURE(status)) {
            ACPI_EXCEPTION((AE_INFO, status, "Error reading AC Adapter state"));
            ac->state = ACPI_AC_STATUS_UNKNOWN;
            return -ENODEV;
      }

      return 0;
}

#ifdef CONFIG_ACPI_PROCFS_POWER
/* --------------------------------------------------------------------------
                              FS Interface (/proc)
   -------------------------------------------------------------------------- */

static struct proc_dir_entry *acpi_ac_dir;

static int acpi_ac_seq_show(struct seq_file *seq, void *offset)
{
      struct acpi_ac *ac = seq->private;


      if (!ac)
            return 0;

      if (acpi_ac_get_state(ac)) {
            seq_puts(seq, "ERROR: Unable to read AC Adapter state\n");
            return 0;
      }

      seq_puts(seq, "state:                   ");
      switch (ac->state) {
      case ACPI_AC_STATUS_OFFLINE:
            seq_puts(seq, "off-line\n");
            break;
      case ACPI_AC_STATUS_ONLINE:
            seq_puts(seq, "on-line\n");
            break;
      default:
            seq_puts(seq, "unknown\n");
            break;
      }

      return 0;
}

static int acpi_ac_open_fs(struct inode *inode, struct file *file)
{
      return single_open(file, acpi_ac_seq_show, PDE(inode)->data);
}

static int acpi_ac_add_fs(struct acpi_device *device)
{
      struct proc_dir_entry *entry = NULL;


      if (!acpi_device_dir(device)) {
            acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
                                         acpi_ac_dir);
            if (!acpi_device_dir(device))
                  return -ENODEV;
            acpi_device_dir(device)->owner = THIS_MODULE;
      }

      /* 'state' [R] */
      entry = create_proc_entry(ACPI_AC_FILE_STATE,
                          S_IRUGO, acpi_device_dir(device));
      if (!entry)
            return -ENODEV;
      else {
            entry->proc_fops = &acpi_ac_fops;
            entry->data = acpi_driver_data(device);
            entry->owner = THIS_MODULE;
      }

      return 0;
}

static int acpi_ac_remove_fs(struct acpi_device *device)
{

      if (acpi_device_dir(device)) {
            remove_proc_entry(ACPI_AC_FILE_STATE, acpi_device_dir(device));

            remove_proc_entry(acpi_device_bid(device), acpi_ac_dir);
            acpi_device_dir(device) = NULL;
      }

      return 0;
}
#endif

/* --------------------------------------------------------------------------
                                   Driver Model
   -------------------------------------------------------------------------- */

static void acpi_ac_notify(acpi_handle handle, u32 event, void *data)
{
      struct acpi_ac *ac = data;
      struct acpi_device *device = NULL;


      if (!ac)
            return;

      device = ac->device;
      switch (event) {
      case ACPI_AC_NOTIFY_STATUS:
      case ACPI_NOTIFY_BUS_CHECK:
      case ACPI_NOTIFY_DEVICE_CHECK:
            acpi_ac_get_state(ac);
            acpi_bus_generate_proc_event(device, event, (u32) ac->state);
            acpi_bus_generate_netlink_event(device->pnp.device_class,
                                      device->dev.bus_id, event,
                                      (u32) ac->state);
#ifdef CONFIG_ACPI_SYSFS_POWER
            kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
#endif
            break;
      default:
            ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                          "Unsupported event [0x%x]\n", event));
            break;
      }

      return;
}

static int acpi_ac_add(struct acpi_device *device)
{
      int result = 0;
      acpi_status status = AE_OK;
      struct acpi_ac *ac = NULL;


      if (!device)
            return -EINVAL;

      ac = kzalloc(sizeof(struct acpi_ac), GFP_KERNEL);
      if (!ac)
            return -ENOMEM;

      ac->device = device;
      strcpy(acpi_device_name(device), ACPI_AC_DEVICE_NAME);
      strcpy(acpi_device_class(device), ACPI_AC_CLASS);
      acpi_driver_data(device) = ac;

      result = acpi_ac_get_state(ac);
      if (result)
            goto end;

#ifdef CONFIG_ACPI_PROCFS_POWER
      result = acpi_ac_add_fs(device);
#endif
      if (result)
            goto end;
#ifdef CONFIG_ACPI_SYSFS_POWER
      ac->charger.name = acpi_device_bid(device);
      ac->charger.type = POWER_SUPPLY_TYPE_MAINS;
      ac->charger.properties = ac_props;
      ac->charger.num_properties = ARRAY_SIZE(ac_props);
      ac->charger.get_property = get_ac_property;
      power_supply_register(&ac->device->dev, &ac->charger);
#endif
      status = acpi_install_notify_handler(device->handle,
                                   ACPI_ALL_NOTIFY, acpi_ac_notify,
                                   ac);
      if (ACPI_FAILURE(status)) {
            result = -ENODEV;
            goto end;
      }

      printk(KERN_INFO PREFIX "%s [%s] (%s)\n",
             acpi_device_name(device), acpi_device_bid(device),
             ac->state ? "on-line" : "off-line");

      end:
      if (result) {
#ifdef CONFIG_ACPI_PROCFS_POWER
            acpi_ac_remove_fs(device);
#endif
            kfree(ac);
      }

      return result;
}

static int acpi_ac_resume(struct acpi_device *device)
{
      struct acpi_ac *ac;
      unsigned old_state;
      if (!device || !acpi_driver_data(device))
            return -EINVAL;
      ac = acpi_driver_data(device);
      old_state = ac->state;
      if (acpi_ac_get_state(ac))
            return 0;
#ifdef CONFIG_ACPI_SYSFS_POWER
      if (old_state != ac->state)
            kobject_uevent(&ac->charger.dev->kobj, KOBJ_CHANGE);
#endif
      return 0;
}

static int acpi_ac_remove(struct acpi_device *device, int type)
{
      acpi_status status = AE_OK;
      struct acpi_ac *ac = NULL;


      if (!device || !acpi_driver_data(device))
            return -EINVAL;

      ac = acpi_driver_data(device);

      status = acpi_remove_notify_handler(device->handle,
                                  ACPI_ALL_NOTIFY, acpi_ac_notify);
#ifdef CONFIG_ACPI_SYSFS_POWER
      if (ac->charger.dev)
            power_supply_unregister(&ac->charger);
#endif
#ifdef CONFIG_ACPI_PROCFS_POWER
      acpi_ac_remove_fs(device);
#endif

      kfree(ac);

      return 0;
}

static int __init acpi_ac_init(void)
{
      int result;

      if (acpi_disabled)
            return -ENODEV;

#ifdef CONFIG_ACPI_PROCFS_POWER
      acpi_ac_dir = acpi_lock_ac_dir();
      if (!acpi_ac_dir)
            return -ENODEV;
#endif

      result = acpi_bus_register_driver(&acpi_ac_driver);
      if (result < 0) {
#ifdef CONFIG_ACPI_PROCFS_POWER
            acpi_unlock_ac_dir(acpi_ac_dir);
#endif
            return -ENODEV;
      }

      return 0;
}

static void __exit acpi_ac_exit(void)
{

      acpi_bus_unregister_driver(&acpi_ac_driver);

#ifdef CONFIG_ACPI_PROCFS_POWER
      acpi_unlock_ac_dir(acpi_ac_dir);
#endif

      return;
}

module_init(acpi_ac_init);
module_exit(acpi_ac_exit);

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