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/*

 *  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);