/*
 *  Intel Virtual Button driver for Windows 8.1+
 *
 *  Copyright (C) 2016 AceLan Kao <acelan.kao@canonical.com>
 *  Copyright (C) 2016 Alex Hung <alex.hung@canonical.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.
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/platform_device.h>
#include <linux/input/sparse-keymap.h>
#include <linux/acpi.h>
#include <acpi/acpi_bus.h>

MODULE_LICENSE("GPL");
MODULE_AUTHOR("AceLan Kao");

static const struct acpi_device_id intel_vbtn_ids[] = {
        {"INT33D6", 0},
        {"", 0},
};

/* In theory, these are HID usages. */
static const struct key_entry intel_vbtn_keymap[] = {
        { KE_IGNORE, 0xC0, { KEY_POWER } },     /* power key press */
        { KE_KEY, 0xC1, { KEY_POWER } },        /* power key release */
        { KE_END },
};

struct intel_vbtn_priv {
        struct input_dev *input_dev;
};

static int intel_vbtn_input_setup(struct platform_device *device)
{
        struct intel_vbtn_priv *priv = dev_get_drvdata(&device->dev);
        int ret;

        priv->input_dev = input_allocate_device();
        if (!priv->input_dev)
                return -ENOMEM;

        ret = sparse_keymap_setup(priv->input_dev, intel_vbtn_keymap, NULL);
        if (ret)
                goto err_free_device;

        priv->input_dev->dev.parent = &device->dev;
        priv->input_dev->name = "Intel Virtual Button driver";
        priv->input_dev->id.bustype = BUS_HOST;

        ret = input_register_device(priv->input_dev);
        if (ret)
                goto err_free_device;

        return 0;

err_free_device:
        input_free_device(priv->input_dev);
        return ret;
}

static void intel_vbtn_input_destroy(struct platform_device *device)
{
        struct intel_vbtn_priv *priv = dev_get_drvdata(&device->dev);

        input_unregister_device(priv->input_dev);
}

static void notify_handler(acpi_handle handle, u32 event, void *context)
{
        struct platform_device *device = context;
        struct intel_vbtn_priv *priv = dev_get_drvdata(&device->dev);

        if (!sparse_keymap_report_event(priv->input_dev, event, 1, true))
                dev_info(&device->dev, "unknown event index 0x%x\n",
                         event);
}

static int intel_vbtn_probe(struct platform_device *device)
{
        acpi_handle handle = ACPI_HANDLE(&device->dev);
        struct intel_vbtn_priv *priv;
        acpi_status status;
        int err;

        status = acpi_evaluate_object(handle, "VBDL", NULL, NULL);
        if (!ACPI_SUCCESS(status)) {
                dev_warn(&device->dev, "failed to read Intel Virtual Button driver\n");
                return -ENODEV;
        }

        priv = devm_kzalloc(&device->dev, sizeof(*priv), GFP_KERNEL);
        if (!priv)
                return -ENOMEM;
        dev_set_drvdata(&device->dev, priv);

        err = intel_vbtn_input_setup(device);
        if (err) {
                pr_err("Failed to setup Intel Virtual Button\n");
                return err;
        }

        status = acpi_install_notify_handler(handle,
                                             ACPI_DEVICE_NOTIFY,
                                             notify_handler,
                                             device);
        if (ACPI_FAILURE(status)) {
                err = -EBUSY;
                goto err_remove_input;
        }

        return 0;

err_remove_input:
        intel_vbtn_input_destroy(device);

        return err;
}

static int intel_vbtn_remove(struct platform_device *device)
{
        acpi_handle handle = ACPI_HANDLE(&device->dev);

        intel_vbtn_input_destroy(device);
        acpi_remove_notify_handler(handle, ACPI_DEVICE_NOTIFY, notify_handler);

        /*
         * Even if we failed to shut off the event stream, we can still
         * safely detach from the device.
         */
        return 0;
}

static struct platform_driver intel_vbtn_pl_driver = {
        .driver = {
                .name = "intel-vbtn",
                .acpi_match_table = intel_vbtn_ids,
        },
        .probe = intel_vbtn_probe,
        .remove = intel_vbtn_remove,
};
MODULE_DEVICE_TABLE(acpi, intel_vbtn_ids);

static acpi_status __init
check_acpi_dev(acpi_handle handle, u32 lvl, void *context, void **rv)
{
        const struct acpi_device_id *ids = context;
        struct acpi_device *dev;

        if (acpi_bus_get_device(handle, &dev) != 0)
                return AE_OK;

        if (acpi_match_device_ids(dev, ids) == 0)
                if (acpi_create_platform_device(dev, NULL))
                        dev_info(&dev->dev,
                                 "intel-vbtn: created platform device\n");

        return AE_OK;
}

static int __init intel_vbtn_init(void)
{
        acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
                            ACPI_UINT32_MAX, check_acpi_dev, NULL,
                            (void *)intel_vbtn_ids, NULL);

        return platform_driver_register(&intel_vbtn_pl_driver);
}
module_init(intel_vbtn_init);

static void __exit intel_vbtn_exit(void)
{
        platform_driver_unregister(&intel_vbtn_pl_driver);
}
module_exit(intel_vbtn_exit);