// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Asus PC WMI hotkey driver
 *
 * Copyright(C) 2010 Intel Corporation.
 * Copyright(C) 2010-2011 Corentin Chary <corentin.chary@gmail.com>
 *
 * Portions based on wistron_btns.c:
 * Copyright (C) 2005 Miloslav Trmac <mitr@volny.cz>
 * Copyright (C) 2005 Bernhard Rosenkraenzer <bero@arklinux.org>
 * Copyright (C) 2005 Dmitry Torokhov <dtor@mail.ru>
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/input/sparse-keymap.h>
#include <linux/fb.h>
#include <linux/backlight.h>
#include <linux/leds.h>
#include <linux/rfkill.h>
#include <linux/pci.h>
#include <linux/pci_hotplug.h>
#include <linux/power_supply.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/platform_data/x86/asus-wmi.h>
#include <linux/platform_device.h>
#include <linux/acpi.h>
#include <linux/dmi.h>
#include <linux/units.h>

#include <acpi/battery.h>
#include <acpi/video.h>

#include "asus-wmi.h"

MODULE_AUTHOR("Corentin Chary <corentin.chary@gmail.com>, "
              "Yong Wang <yong.y.wang@intel.com>");
MODULE_DESCRIPTION("Asus Generic WMI Driver");
MODULE_LICENSE("GPL");

#define to_asus_wmi_driver(pdrv)                                        \
        (container_of((pdrv), struct asus_wmi_driver, platform_driver))

#define ASUS_WMI_MGMT_GUID      "97845ED0-4E6D-11DE-8A39-0800200C9A66"

#define NOTIFY_BRNUP_MIN                0x11
#define NOTIFY_BRNUP_MAX                0x1f
#define NOTIFY_BRNDOWN_MIN              0x20
#define NOTIFY_BRNDOWN_MAX              0x2e
#define NOTIFY_FNLOCK_TOGGLE            0x4e
#define NOTIFY_KBD_DOCK_CHANGE          0x75
#define NOTIFY_KBD_BRTUP                0xc4
#define NOTIFY_KBD_BRTDWN               0xc5
#define NOTIFY_KBD_BRTTOGGLE            0xc7
#define NOTIFY_KBD_FBM                  0x99
#define NOTIFY_KBD_TTP                  0xae

#define ASUS_WMI_FNLOCK_BIOS_DISABLED   BIT(0)

#define ASUS_FAN_DESC                   "cpu_fan"
#define ASUS_FAN_MFUN                   0x13
#define ASUS_FAN_SFUN_READ              0x06
#define ASUS_FAN_SFUN_WRITE             0x07

/* Based on standard hwmon pwmX_enable values */
#define ASUS_FAN_CTRL_FULLSPEED         0
#define ASUS_FAN_CTRL_MANUAL            1
#define ASUS_FAN_CTRL_AUTO              2

#define ASUS_FAN_BOOST_MODE_NORMAL              0
#define ASUS_FAN_BOOST_MODE_OVERBOOST           1
#define ASUS_FAN_BOOST_MODE_OVERBOOST_MASK      0x01
#define ASUS_FAN_BOOST_MODE_SILENT              2
#define ASUS_FAN_BOOST_MODE_SILENT_MASK         0x02
#define ASUS_FAN_BOOST_MODES_MASK               0x03

#define ASUS_THROTTLE_THERMAL_POLICY_DEFAULT    0
#define ASUS_THROTTLE_THERMAL_POLICY_OVERBOOST  1
#define ASUS_THROTTLE_THERMAL_POLICY_SILENT     2

#define USB_INTEL_XUSB2PR               0xD0
#define PCI_DEVICE_ID_INTEL_LYNXPOINT_LP_XHCI   0x9c31

#define ASUS_ACPI_UID_ASUSWMI           "ASUSWMI"
#define ASUS_ACPI_UID_ATK               "ATK"

#define WMI_EVENT_QUEUE_SIZE            0x10
#define WMI_EVENT_QUEUE_END             0x1
#define WMI_EVENT_MASK                  0xFFFF
/* The WMI hotkey event value is always the same. */
#define WMI_EVENT_VALUE_ATK             0xFF

#define WMI_EVENT_MASK                  0xFFFF

static const char * const ashs_ids[] = { "ATK4001", "ATK4002", NULL };

static bool ashs_present(void)
{
        int i = 0;
        while (ashs_ids[i]) {
                if (acpi_dev_found(ashs_ids[i++]))
                        return true;
        }
        return false;
}

struct bios_args {
        u32 arg0;
        u32 arg1;
        u32 arg2; /* At least TUF Gaming series uses 3 dword input buffer. */
        u32 arg4;
        u32 arg5;
} __packed;

/*
 * Struct that's used for all methods called via AGFN. Naming is
 * identically to the AML code.
 */
struct agfn_args {
        u16 mfun; /* probably "Multi-function" to be called */
        u16 sfun; /* probably "Sub-function" to be called */
        u16 len;  /* size of the hole struct, including subfunction fields */
        u8 stas;  /* not used by now */
        u8 err;   /* zero on success */
} __packed;

/* struct used for calling fan read and write methods */
struct agfn_fan_args {
        struct agfn_args agfn;  /* common fields */
        u8 fan;                 /* fan number: 0: set auto mode 1: 1st fan */
        u32 speed;              /* read: RPM/100 - write: 0-255 */
} __packed;

/*
 * <platform>/    - debugfs root directory
 *   dev_id      - current dev_id
 *   ctrl_param  - current ctrl_param
 *   method_id   - current method_id
 *   devs        - call DEVS(dev_id, ctrl_param) and print result
 *   dsts        - call DSTS(dev_id)  and print result
 *   call        - call method_id(dev_id, ctrl_param) and print result
 */
struct asus_wmi_debug {
        struct dentry *root;
        u32 method_id;
        u32 dev_id;
        u32 ctrl_param;
};

struct asus_rfkill {
        struct asus_wmi *asus;
        struct rfkill *rfkill;
        u32 dev_id;
};

enum fan_type {
        FAN_TYPE_NONE = 0,
        FAN_TYPE_AGFN,          /* deprecated on newer platforms */
        FAN_TYPE_SPEC83,        /* starting in Spec 8.3, use CPU_FAN_CTRL */
};

struct asus_wmi {
        int dsts_id;
        int spec;
        int sfun;
        bool wmi_event_queue;

        struct input_dev *inputdev;
        struct backlight_device *backlight_device;
        struct platform_device *platform_device;

        struct led_classdev wlan_led;
        int wlan_led_wk;
        struct led_classdev tpd_led;
        int tpd_led_wk;
        struct led_classdev kbd_led;
        int kbd_led_wk;
        struct led_classdev lightbar_led;
        int lightbar_led_wk;
        struct workqueue_struct *led_workqueue;
        struct work_struct tpd_led_work;
        struct work_struct wlan_led_work;
        struct work_struct lightbar_led_work;

        struct asus_rfkill wlan;
        struct asus_rfkill bluetooth;
        struct asus_rfkill wimax;
        struct asus_rfkill wwan3g;
        struct asus_rfkill gps;
        struct asus_rfkill uwb;

        enum fan_type fan_type;
        int fan_pwm_mode;
        int agfn_pwm;

        bool fan_boost_mode_available;
        u8 fan_boost_mode_mask;
        u8 fan_boost_mode;

        bool throttle_thermal_policy_available;
        u8 throttle_thermal_policy_mode;

        // The RSOC controls the maximum charging percentage.
        bool battery_rsoc_available;

        struct hotplug_slot hotplug_slot;
        struct mutex hotplug_lock;
        struct mutex wmi_lock;
        struct workqueue_struct *hotplug_workqueue;
        struct work_struct hotplug_work;

        bool fnlock_locked;

        struct asus_wmi_debug debug;

        struct asus_wmi_driver *driver;
};

/* WMI ************************************************************************/

static int asus_wmi_evaluate_method3(u32 method_id,
                u32 arg0, u32 arg1, u32 arg2, u32 *retval)
{
        struct bios_args args = {
                .arg0 = arg0,
                .arg1 = arg1,
                .arg2 = arg2,
        };
        struct acpi_buffer input = { (acpi_size) sizeof(args), &args };
        struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
        acpi_status status;
        union acpi_object *obj;
        u32 tmp = 0;

        status = wmi_evaluate_method(ASUS_WMI_MGMT_GUID, 0, method_id,
                                     &input, &output);

        if (ACPI_FAILURE(status))
                return -EIO;

        obj = (union acpi_object *)output.pointer;
        if (obj && obj->type == ACPI_TYPE_INTEGER)
                tmp = (u32) obj->integer.value;

        if (retval)
                *retval = tmp;

        kfree(obj);

        if (tmp == ASUS_WMI_UNSUPPORTED_METHOD)
                return -ENODEV;

        return 0;
}

int asus_wmi_evaluate_method(u32 method_id, u32 arg0, u32 arg1, u32 *retval)
{
        return asus_wmi_evaluate_method3(method_id, arg0, arg1, 0, retval);
}
EXPORT_SYMBOL_GPL(asus_wmi_evaluate_method);

static int asus_wmi_evaluate_method_agfn(const struct acpi_buffer args)
{
        struct acpi_buffer input;
        u64 phys_addr;
        u32 retval;
        u32 status;

        /*
         * Copy to dma capable address otherwise memory corruption occurs as
         * bios has to be able to access it.
         */
        input.pointer = kmemdup(args.pointer, args.length, GFP_DMA | GFP_KERNEL);
        input.length = args.length;
        if (!input.pointer)
                return -ENOMEM;
        phys_addr = virt_to_phys(input.pointer);

        status = asus_wmi_evaluate_method(ASUS_WMI_METHODID_AGFN,
                                        phys_addr, 0, &retval);
        if (!status)
                memcpy(args.pointer, input.pointer, args.length);

        kfree(input.pointer);
        if (status)
                return -ENXIO;

        return retval;
}

static int asus_wmi_get_devstate(struct asus_wmi *asus, u32 dev_id, u32 *retval)
{
        return asus_wmi_evaluate_method(asus->dsts_id, dev_id, 0, retval);
}

static int asus_wmi_set_devstate(u32 dev_id, u32 ctrl_param,
                                 u32 *retval)
{
        return asus_wmi_evaluate_method(ASUS_WMI_METHODID_DEVS, dev_id,
                                        ctrl_param, retval);
}

/* Helper for special devices with magic return codes */
static int asus_wmi_get_devstate_bits(struct asus_wmi *asus,
                                      u32 dev_id, u32 mask)
{
        u32 retval = 0;
        int err;

        err = asus_wmi_get_devstate(asus, dev_id, &retval);
        if (err < 0)
                return err;

        if (!(retval & ASUS_WMI_DSTS_PRESENCE_BIT))
                return -ENODEV;

        if (mask == ASUS_WMI_DSTS_STATUS_BIT) {
                if (retval & ASUS_WMI_DSTS_UNKNOWN_BIT)
                        return -ENODEV;
        }

        return retval & mask;
}

static int asus_wmi_get_devstate_simple(struct asus_wmi *asus, u32 dev_id)
{
        return asus_wmi_get_devstate_bits(asus, dev_id,
                                          ASUS_WMI_DSTS_STATUS_BIT);
}

static bool asus_wmi_dev_is_present(struct asus_wmi *asus, u32 dev_id)
{
        u32 retval;
        int status = asus_wmi_get_devstate(asus, dev_id, &retval);

        return status == 0 && (retval & ASUS_WMI_DSTS_PRESENCE_BIT);
}

/* Input **********************************************************************/

static int asus_wmi_input_init(struct asus_wmi *asus)
{
        int err, result;

        asus->inputdev = input_allocate_device();
        if (!asus->inputdev)
                return -ENOMEM;

        asus->inputdev->name = asus->driver->input_name;
        asus->inputdev->phys = asus->driver->input_phys;
        asus->inputdev->id.bustype = BUS_HOST;
        asus->inputdev->dev.parent = &asus->platform_device->dev;
        set_bit(EV_REP, asus->inputdev->evbit);

        err = sparse_keymap_setup(asus->inputdev, asus->driver->keymap, NULL);
        if (err)
                goto err_free_dev;

        if (asus->driver->quirks->use_kbd_dock_devid) {
                result = asus_wmi_get_devstate_simple(asus, ASUS_WMI_DEVID_KBD_DOCK);
                if (result >= 0) {
                        input_set_capability(asus->inputdev, EV_SW, SW_TABLET_MODE);
                        input_report_switch(asus->inputdev, SW_TABLET_MODE, !result);
                } else if (result != -ENODEV) {
                        pr_err("Error checking for keyboard-dock: %d\n", result);
                }
        }

        err = input_register_device(asus->inputdev);
        if (err)
                goto err_free_dev;

        return 0;

err_free_dev:
        input_free_device(asus->inputdev);
        return err;
}

static void asus_wmi_input_exit(struct asus_wmi *asus)
{
        if (asus->inputdev)
                input_unregister_device(asus->inputdev);

        asus->inputdev = NULL;
}

/* Battery ********************************************************************/

/* The battery maximum charging percentage */
static int charge_end_threshold;

static ssize_t charge_control_end_threshold_store(struct device *dev,
                                                  struct device_attribute *attr,
                                                  const char *buf, size_t count)
{
        int value, ret, rv;

        ret = kstrtouint(buf, 10, &value);
        if (ret)
                return ret;

        if (value < 0 || value > 100)
                return -EINVAL;

        ret = asus_wmi_set_devstate(ASUS_WMI_DEVID_RSOC, value, &rv);
        if (ret)
                return ret;

        if (rv != 1)
                return -EIO;

        /* There isn't any method in the DSDT to read the threshold, so we
         * save the threshold.
         */
        charge_end_threshold = value;
        return count;
}

static ssize_t charge_control_end_threshold_show(struct device *device,
                                                 struct device_attribute *attr,
                                                 char *buf)
{
        return sprintf(buf, "%d\n", charge_end_threshold);
}

static DEVICE_ATTR_RW(charge_control_end_threshold);

static int asus_wmi_battery_add(struct power_supply *battery)
{
        /* The WMI method does not provide a way to specific a battery, so we
         * just assume it is the first battery.
         * Note: On some newer ASUS laptops (Zenbook UM431DA), the primary/first
         * battery is named BATT.
         */
        if (strcmp(battery->desc->name, "BAT0") != 0 &&
            strcmp(battery->desc->name, "BAT1") != 0 &&
            strcmp(battery->desc->name, "BATC") != 0 &&
            strcmp(battery->desc->name, "BATT") != 0)
                return -ENODEV;

        if (device_create_file(&battery->dev,
            &dev_attr_charge_control_end_threshold))
                return -ENODEV;

        /* The charge threshold is only reset when the system is power cycled,
         * and we can't get the current threshold so let set it to 100% when
         * a battery is added.
         */
        asus_wmi_set_devstate(ASUS_WMI_DEVID_RSOC, 100, NULL);
        charge_end_threshold = 100;

        return 0;
}

static int asus_wmi_battery_remove(struct power_supply *battery)
{
        device_remove_file(&battery->dev,
                           &dev_attr_charge_control_end_threshold);
        return 0;
}

static struct acpi_battery_hook battery_hook = {
        .add_battery = asus_wmi_battery_add,
        .remove_battery = asus_wmi_battery_remove,
        .name = "ASUS Battery Extension",
};

static void asus_wmi_battery_init(struct asus_wmi *asus)
{
        asus->battery_rsoc_available = false;
        if (asus_wmi_dev_is_present(asus, ASUS_WMI_DEVID_RSOC)) {
                asus->battery_rsoc_available = true;
                battery_hook_register(&battery_hook);
        }
}

static void asus_wmi_battery_exit(struct asus_wmi *asus)
{
        if (asus->battery_rsoc_available)
                battery_hook_unregister(&battery_hook);
}

/* LEDs ***********************************************************************/

/*
 * These functions actually update the LED's, and are called from a
 * workqueue. By doing this as separate work rather than when the LED
 * subsystem asks, we avoid messing with the Asus ACPI stuff during a
 * potentially bad time, such as a timer interrupt.
 */
static void tpd_led_update(struct work_struct *work)
{
        int ctrl_param;
        struct asus_wmi *asus;

        asus = container_of(work, struct asus_wmi, tpd_led_work);

        ctrl_param = asus->tpd_led_wk;
        asus_wmi_set_devstate(ASUS_WMI_DEVID_TOUCHPAD_LED, ctrl_param, NULL);
}

static void tpd_led_set(struct led_classdev *led_cdev,
                        enum led_brightness value)
{
        struct asus_wmi *asus;

        asus = container_of(led_cdev, struct asus_wmi, tpd_led);

        asus->tpd_led_wk = !!value;
        queue_work(asus->led_workqueue, &asus->tpd_led_work);
}

static int read_tpd_led_state(struct asus_wmi *asus)
{
        return asus_wmi_get_devstate_simple(asus, ASUS_WMI_DEVID_TOUCHPAD_LED);
}

static enum led_brightness tpd_led_get(struct led_classdev *led_cdev)
{
        struct asus_wmi *asus;

        asus = container_of(led_cdev, struct asus_wmi, tpd_led);

        return read_tpd_led_state(asus);
}

static void kbd_led_update(struct asus_wmi *asus)
{
        int ctrl_param = 0;

        ctrl_param = 0x80 | (asus->kbd_led_wk & 0x7F);
        asus_wmi_set_devstate(ASUS_WMI_DEVID_KBD_BACKLIGHT, ctrl_param, NULL);
}

static int kbd_led_read(struct asus_wmi *asus, int *level, int *env)
{
        int retval;

        /*
         * bits 0-2: level
         * bit 7: light on/off
         * bit 8-10: environment (0: dark, 1: normal, 2: light)
         * bit 17: status unknown
         */
        retval = asus_wmi_get_devstate_bits(asus, ASUS_WMI_DEVID_KBD_BACKLIGHT,
                                            0xFFFF);

        /* Unknown status is considered as off */
        if (retval == 0x8000)
                retval = 0;

        if (retval < 0)
                return retval;

        if (level)
                *level = retval & 0x7F;
        if (env)
                *env = (retval >> 8) & 0x7F;
        return 0;
}

static void do_kbd_led_set(struct led_classdev *led_cdev, int value)
{
        struct asus_wmi *asus;
        int max_level;

        asus = container_of(led_cdev, struct asus_wmi, kbd_led);
        max_level = asus->kbd_led.max_brightness;

        asus->kbd_led_wk = clamp_val(value, 0, max_level);
        kbd_led_update(asus);
}

static void kbd_led_set(struct led_classdev *led_cdev,
                        enum led_brightness value)
{
        /* Prevent disabling keyboard backlight on module unregister */
        if (led_cdev->flags & LED_UNREGISTERING)
                return;

        do_kbd_led_set(led_cdev, value);
}

static void kbd_led_set_by_kbd(struct asus_wmi *asus, enum led_brightness value)
{
        struct led_classdev *led_cdev = &asus->kbd_led;

        do_kbd_led_set(led_cdev, value);
        led_classdev_notify_brightness_hw_changed(led_cdev, asus->kbd_led_wk);
}

static enum led_brightness kbd_led_get(struct led_classdev *led_cdev)
{
        struct asus_wmi *asus;
        int retval, value;

        asus = container_of(led_cdev, struct asus_wmi, kbd_led);

        retval = kbd_led_read(asus, &value, NULL);
        if (retval < 0)
                return retval;

        return value;
}

static int wlan_led_unknown_state(struct asus_wmi *asus)
{
        u32 result;

        asus_wmi_get_devstate(asus, ASUS_WMI_DEVID_WIRELESS_LED, &result);

        return result & ASUS_WMI_DSTS_UNKNOWN_BIT;
}

static void wlan_led_update(struct work_struct *work)
{
        int ctrl_param;
        struct asus_wmi *asus;

        asus = container_of(work, struct asus_wmi, wlan_led_work);

        ctrl_param = asus->wlan_led_wk;
        asus_wmi_set_devstate(ASUS_WMI_DEVID_WIRELESS_LED, ctrl_param, NULL);
}

static void wlan_led_set(struct led_classdev *led_cdev,
                         enum led_brightness value)
{
        struct asus_wmi *asus;

        asus = container_of(led_cdev, struct asus_wmi, wlan_led);

        asus->wlan_led_wk = !!value;
        queue_work(asus->led_workqueue, &asus->wlan_led_work);
}

static enum led_brightness wlan_led_get(struct led_classdev *led_cdev)
{
        struct asus_wmi *asus;
        u32 result;

        asus = container_of(led_cdev, struct asus_wmi, wlan_led);
        asus_wmi_get_devstate(asus, ASUS_WMI_DEVID_WIRELESS_LED, &result);

        return result & ASUS_WMI_DSTS_BRIGHTNESS_MASK;
}

static void lightbar_led_update(struct work_struct *work)
{
        struct asus_wmi *asus;
        int ctrl_param;

        asus = container_of(work, struct asus_wmi, lightbar_led_work);

        ctrl_param = asus->lightbar_led_wk;
        asus_wmi_set_devstate(ASUS_WMI_DEVID_LIGHTBAR, ctrl_param, NULL);
}

static void lightbar_led_set(struct led_classdev *led_cdev,
                             enum led_brightness value)
{
        struct asus_wmi *asus;

        asus = container_of(led_cdev, struct asus_wmi, lightbar_led);

        asus->lightbar_led_wk = !!value;
        queue_work(asus->led_workqueue, &asus->lightbar_led_work);
}

static enum led_brightness lightbar_led_get(struct led_classdev *led_cdev)
{
        struct asus_wmi *asus;
        u32 result;

        asus = container_of(led_cdev, struct asus_wmi, lightbar_led);
        asus_wmi_get_devstate(asus, ASUS_WMI_DEVID_LIGHTBAR, &result);

        return result & ASUS_WMI_DSTS_LIGHTBAR_MASK;
}

static void asus_wmi_led_exit(struct asus_wmi *asus)
{
        led_classdev_unregister(&asus->kbd_led);
        led_classdev_unregister(&asus->tpd_led);
        led_classdev_unregister(&asus->wlan_led);
        led_classdev_unregister(&asus->lightbar_led);

        if (asus->led_workqueue)
                destroy_workqueue(asus->led_workqueue);
}

static int asus_wmi_led_init(struct asus_wmi *asus)
{
        int rv = 0, led_val;

        asus->led_workqueue = create_singlethread_workqueue("led_workqueue");
        if (!asus->led_workqueue)
                return -ENOMEM;

        if (read_tpd_led_state(asus) >= 0) {
                INIT_WORK(&asus->tpd_led_work, tpd_led_update);

                asus->tpd_led.name = "asus::touchpad";
                asus->tpd_led.brightness_set = tpd_led_set;
                asus->tpd_led.brightness_get = tpd_led_get;
                asus->tpd_led.max_brightness = 1;

                rv = led_classdev_register(&asus->platform_device->dev,
                                           &asus->tpd_led);
                if (rv)
                        goto error;
        }

        if (!kbd_led_read(asus, &led_val, NULL)) {
                asus->kbd_led_wk = led_val;
                asus->kbd_led.name = "asus::kbd_backlight";
                asus->kbd_led.flags = LED_BRIGHT_HW_CHANGED;
                asus->kbd_led.brightness_set = kbd_led_set;
                asus->kbd_led.brightness_get = kbd_led_get;
                asus->kbd_led.max_brightness = 3;

                rv = led_classdev_register(&asus->platform_device->dev,
                                           &asus->kbd_led);
                if (rv)
                        goto error;
        }

        if (asus_wmi_dev_is_present(asus, ASUS_WMI_DEVID_WIRELESS_LED)
                        && (asus->driver->quirks->wapf > 0)) {
                INIT_WORK(&asus->wlan_led_work, wlan_led_update);

                asus->wlan_led.name = "asus::wlan";
                asus->wlan_led.brightness_set = wlan_led_set;
                if (!wlan_led_unknown_state(asus))
                        asus->wlan_led.brightness_get = wlan_led_get;
                asus->wlan_led.flags = LED_CORE_SUSPENDRESUME;
                asus->wlan_led.max_brightness = 1;
                asus->wlan_led.default_trigger = "asus-wlan";

                rv = led_classdev_register(&asus->platform_device->dev,
                                           &asus->wlan_led);
                if (rv)
                        goto error;
        }

        if (asus_wmi_dev_is_present(asus, ASUS_WMI_DEVID_LIGHTBAR)) {
                INIT_WORK(&asus->lightbar_led_work, lightbar_led_update);

                asus->lightbar_led.name = "asus::lightbar";
                asus->lightbar_led.brightness_set = lightbar_led_set;
                asus->lightbar_led.brightness_get = lightbar_led_get;
                asus->lightbar_led.max_brightness = 1;

                rv = led_classdev_register(&asus->platform_device->dev,
                                           &asus->lightbar_led);
        }

error:
        if (rv)
                asus_wmi_led_exit(asus);

        return rv;
}

/* RF *************************************************************************/

/*
 * PCI hotplug (for wlan rfkill)
 */
static bool asus_wlan_rfkill_blocked(struct asus_wmi *asus)
{
        int result = asus_wmi_get_devstate_simple(asus, ASUS_WMI_DEVID_WLAN);

        if (result < 0)
                return false;
        return !result;
}

static void asus_rfkill_hotplug(struct asus_wmi *asus)
{
        struct pci_dev *dev;
        struct pci_bus *bus;
        bool blocked;
        bool absent;
        u32 l;

        mutex_lock(&asus->wmi_lock);
        blocked = asus_wlan_rfkill_blocked(asus);
        mutex_unlock(&asus->wmi_lock);

        mutex_lock(&asus->hotplug_lock);
        pci_lock_rescan_remove();

        if (asus->wlan.rfkill)
                rfkill_set_sw_state(asus->wlan.rfkill, blocked);

        if (asus->hotplug_slot.ops) {
                bus = pci_find_bus(0, 1);
                if (!bus) {
                        pr_warn("Unable to find PCI bus 1?\n");
                        goto out_unlock;
                }

                if (pci_bus_read_config_dword(bus, 0, PCI_VENDOR_ID, &l)) {
                        pr_err("Unable to read PCI config space?\n");
                        goto out_unlock;
                }
                absent = (l == 0xffffffff);

                if (blocked != absent) {
                        pr_warn("BIOS says wireless lan is %s, "
                                "but the pci device is %s\n",
                                blocked ? "blocked" : "unblocked",
                                absent ? "absent" : "present");
                        pr_warn("skipped wireless hotplug as probably "
                                "inappropriate for this model\n");
                        goto out_unlock;
                }

                if (!blocked) {
                        dev = pci_get_slot(bus, 0);
                        if (dev) {
                                /* Device already present */
                                pci_dev_put(dev);
                                goto out_unlock;
                        }
                        dev = pci_scan_single_device(bus, 0);
                        if (dev) {
                                pci_bus_assign_resources(bus);
                                pci_bus_add_device(dev);
                        }
                } else {
                        dev = pci_get_slot(bus, 0);
                        if (dev) {
                                pci_stop_and_remove_bus_device(dev);
                                pci_dev_put(dev);
                        }
                }
        }

out_unlock:
        pci_unlock_rescan_remove();
        mutex_unlock(&asus->hotplug_lock);
}

static void asus_rfkill_notify(acpi_handle handle, u32 event, void *data)
{
        struct asus_wmi *asus = data;

        if (event != ACPI_NOTIFY_BUS_CHECK)
                return;

        /*
         * We can't call directly asus_rfkill_hotplug because most
         * of the time WMBC is still being executed and not reetrant.
         * There is currently no way to tell ACPICA that  we want this
         * method to be serialized, we schedule a asus_rfkill_hotplug
         * call later, in a safer context.
         */
        queue_work(asus->hotplug_workqueue, &asus->hotplug_work);
}

static int asus_register_rfkill_notifier(struct asus_wmi *asus, char *node)
{
        acpi_status status;
        acpi_handle handle;

        status = acpi_get_handle(NULL, node, &handle);
        if (ACPI_FAILURE(status))
                return -ENODEV;

        status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
                                             asus_rfkill_notify, asus);
        if (ACPI_FAILURE(status))
                pr_warn("Failed to register notify on %s\n", node);

        return 0;
}

static void asus_unregister_rfkill_notifier(struct asus_wmi *asus, char *node)
{
        acpi_status status = AE_OK;
        acpi_handle handle;

        status = acpi_get_handle(NULL, node, &handle);
        if (ACPI_FAILURE(status))
                return;

        status = acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
                                            asus_rfkill_notify);
        if (ACPI_FAILURE(status))
                pr_err("Error removing rfkill notify handler %s\n", node);
}

static int asus_get_adapter_status(struct hotplug_slot *hotplug_slot,
                                   u8 *value)
{
        struct asus_wmi *asus = container_of(hotplug_slot,
                                             struct asus_wmi, hotplug_slot);
        int result = asus_wmi_get_devstate_simple(asus, ASUS_WMI_DEVID_WLAN);

        if (result < 0)
                return result;

        *value = !!result;
        return 0;
}

static const struct hotplug_slot_ops asus_hotplug_slot_ops = {
        .get_adapter_status = asus_get_adapter_status,
        .get_power_status = asus_get_adapter_status,
};

static void asus_hotplug_work(struct work_struct *work)
{
        struct asus_wmi *asus;

        asus = container_of(work, struct asus_wmi, hotplug_work);
        asus_rfkill_hotplug(asus);
}

static int asus_setup_pci_hotplug(struct asus_wmi *asus)
{
        int ret = -ENOMEM;
        struct pci_bus *bus = pci_find_bus(0, 1);

        if (!bus) {
                pr_err("Unable to find wifi PCI bus\n");
                return -ENODEV;
        }

        asus->hotplug_workqueue =
            create_singlethread_workqueue("hotplug_workqueue");
        if (!asus->hotplug_workqueue)
                goto error_workqueue;

        INIT_WORK(&asus->hotplug_work, asus_hotplug_work);

        asus->hotplug_slot.ops = &asus_hotplug_slot_ops;

        ret = pci_hp_register(&asus->hotplug_slot, bus, 0, "asus-wifi");
        if (ret) {
                pr_err("Unable to register hotplug slot - %d\n", ret);
                goto error_register;
        }

        return 0;

error_register:
        asus->hotplug_slot.ops = NULL;
        destroy_workqueue(asus->hotplug_workqueue);
error_workqueue:
        return ret;
}

/*
 * Rfkill devices
 */
static int asus_rfkill_set(void *data, bool blocked)
{
        struct asus_rfkill *priv = data;
        u32 ctrl_param = !blocked;
        u32 dev_id = priv->dev_id;

        /*
         * If the user bit is set, BIOS can't set and record the wlan status,
         * it will report the value read from id ASUS_WMI_DEVID_WLAN_LED
         * while we query the wlan status through WMI(ASUS_WMI_DEVID_WLAN).
         * So, we have to record wlan status in id ASUS_WMI_DEVID_WLAN_LED
         * while setting the wlan status through WMI.
         * This is also the behavior that windows app will do.
         */
        if ((dev_id == ASUS_WMI_DEVID_WLAN) &&
             priv->asus->driver->wlan_ctrl_by_user)
                dev_id = ASUS_WMI_DEVID_WLAN_LED;

        return asus_wmi_set_devstate(dev_id, ctrl_param, NULL);
}

static void asus_rfkill_query(struct rfkill *rfkill, void *data)
{
        struct asus_rfkill *priv = data;
        int result;

        result = asus_wmi_get_devstate_simple(priv->asus, priv->dev_id);

        if (result < 0)
                return;

        rfkill_set_sw_state(priv->rfkill, !result);

}

static int asus_rfkill_wlan_set(void *data, bool blocked)
{
        struct asus_rfkill *priv = data;
        struct asus_wmi *asus = priv->asus;
        int ret;

        /*
         * This handler is enabled only if hotplug is enabled.
         * In this case, the asus_wmi_set_devstate() will
         * trigger a wmi notification and we need to wait
         * this call to finish before being able to call
         * any wmi method
         */
        mutex_lock(&asus->wmi_lock);
        ret = asus_rfkill_set(data, blocked);
        mutex_unlock(&asus->wmi_lock);
        return ret;
}

static const struct rfkill_ops asus_rfkill_wlan_ops = {
        .set_block = asus_rfkill_wlan_set,
        .query = asus_rfkill_query,
};

static const struct rfkill_ops asus_rfkill_ops = {
        .set_block = asus_rfkill_set,
        .query = asus_rfkill_query,
};

static int asus_new_rfkill(struct asus_wmi *asus,
                           struct asus_rfkill *arfkill,
                           const char *name, enum rfkill_type type, int dev_id)
{
        int result = asus_wmi_get_devstate_simple(asus, dev_id);
        struct rfkill **rfkill = &arfkill->rfkill;

        if (result < 0)
                return result;

        arfkill->dev_id = dev_id;
        arfkill->asus = asus;

        if (dev_id == ASUS_WMI_DEVID_WLAN &&
            asus->driver->quirks->hotplug_wireless)
                *rfkill = rfkill_alloc(name, &asus->platform_device->dev, type,
                                       &asus_rfkill_wlan_ops, arfkill);
        else
                *rfkill = rfkill_alloc(name, &asus->platform_device->dev, type,
                                       &asus_rfkill_ops, arfkill);

        if (!*rfkill)
                return -EINVAL;

        if ((dev_id == ASUS_WMI_DEVID_WLAN) &&
                        (asus->driver->quirks->wapf > 0))
                rfkill_set_led_trigger_name(*rfkill, "asus-wlan");

        rfkill_init_sw_state(*rfkill, !result);
        result = rfkill_register(*rfkill);
        if (result) {
                rfkill_destroy(*rfkill);
                *rfkill = NULL;
                return result;
        }
        return 0;
}

static void asus_wmi_rfkill_exit(struct asus_wmi *asus)
{
        if (asus->driver->wlan_ctrl_by_user && ashs_present())
                return;

        asus_unregister_rfkill_notifier(asus, "\\_SB.PCI0.P0P5");
        asus_unregister_rfkill_notifier(asus, "\\_SB.PCI0.P0P6");
        asus_unregister_rfkill_notifier(asus, "\\_SB.PCI0.P0P7");
        if (asus->wlan.rfkill) {
                rfkill_unregister(asus->wlan.rfkill);
                rfkill_destroy(asus->wlan.rfkill);
                asus->wlan.rfkill = NULL;
        }
        /*
         * Refresh pci hotplug in case the rfkill state was changed after
         * asus_unregister_rfkill_notifier()
         */
        asus_rfkill_hotplug(asus);
        if (asus->hotplug_slot.ops)
                pci_hp_deregister(&asus->hotplug_slot);
        if (asus->hotplug_workqueue)
                destroy_workqueue(asus->hotplug_workqueue);

        if (asus->bluetooth.rfkill) {
                rfkill_unregister(asus->bluetooth.rfkill);
                rfkill_destroy(asus->bluetooth.rfkill);
                asus->bluetooth.rfkill = NULL;
        }
        if (asus->wimax.rfkill) {
                rfkill_unregister(asus->wimax.rfkill);
                rfkill_destroy(asus->wimax.rfkill);
                asus->wimax.rfkill = NULL;
        }
        if (asus->wwan3g.rfkill) {
                rfkill_unregister(asus->wwan3g.rfkill);
                rfkill_destroy(asus->wwan3g.rfkill);
                asus->wwan3g.rfkill = NULL;
        }
        if (asus->gps.rfkill) {
                rfkill_unregister(asus->gps.rfkill);
                rfkill_destroy(asus->gps.rfkill);
                asus->gps.rfkill = NULL;
        }
        if (asus->uwb.rfkill) {
                rfkill_unregister(asus->uwb.rfkill);
                rfkill_destroy(asus->uwb.rfkill);
                asus->uwb.rfkill = NULL;
        }
}

static int asus_wmi_rfkill_init(struct asus_wmi *asus)
{
        int result = 0;

        mutex_init(&asus->hotplug_lock);
        mutex_init(&asus->wmi_lock);

        result = asus_new_rfkill(asus, &asus->wlan, "asus-wlan",
                                 RFKILL_TYPE_WLAN, ASUS_WMI_DEVID_WLAN);

        if (result && result != -ENODEV)
                goto exit;

        result = asus_new_rfkill(asus, &asus->bluetooth,
                                 "asus-bluetooth", RFKILL_TYPE_BLUETOOTH,
                                 ASUS_WMI_DEVID_BLUETOOTH);

        if (result && result != -ENODEV)
                goto exit;

        result = asus_new_rfkill(asus, &asus->wimax, "asus-wimax",
                                 RFKILL_TYPE_WIMAX, ASUS_WMI_DEVID_WIMAX);

        if (result && result != -ENODEV)
                goto exit;

        result = asus_new_rfkill(asus, &asus->wwan3g, "asus-wwan3g",
                                 RFKILL_TYPE_WWAN, ASUS_WMI_DEVID_WWAN3G);

        if (result && result != -ENODEV)
                goto exit;

        result = asus_new_rfkill(asus, &asus->gps, "asus-gps",
                                 RFKILL_TYPE_GPS, ASUS_WMI_DEVID_GPS);

        if (result && result != -ENODEV)
                goto exit;

        result = asus_new_rfkill(asus, &asus->uwb, "asus-uwb",
                                 RFKILL_TYPE_UWB, ASUS_WMI_DEVID_UWB);

        if (result && result != -ENODEV)
                goto exit;

        if (!asus->driver->quirks->hotplug_wireless)
                goto exit;

        result = asus_setup_pci_hotplug(asus);
        /*
         * If we get -EBUSY then something else is handling the PCI hotplug -
         * don't fail in this case
         */
        if (result == -EBUSY)
                result = 0;

        asus_register_rfkill_notifier(asus, "\\_SB.PCI0.P0P5");
        asus_register_rfkill_notifier(asus, "\\_SB.PCI0.P0P6");
        asus_register_rfkill_notifier(asus, "\\_SB.PCI0.P0P7");
        /*
         * Refresh pci hotplug in case the rfkill state was changed during
         * setup.
         */
        asus_rfkill_hotplug(asus);

exit:
        if (result && result != -ENODEV)
                asus_wmi_rfkill_exit(asus);

        if (result == -ENODEV)
                result = 0;

        return result;
}

/* Quirks *********************************************************************/

static void asus_wmi_set_xusb2pr(struct asus_wmi *asus)
{
        struct pci_dev *xhci_pdev;
        u32 orig_ports_available;
        u32 ports_available = asus->driver->quirks->xusb2pr;

        xhci_pdev = pci_get_device(PCI_VENDOR_ID_INTEL,
                        PCI_DEVICE_ID_INTEL_LYNXPOINT_LP_XHCI,
                        NULL);

        if (!xhci_pdev)
                return;

        pci_read_config_dword(xhci_pdev, USB_INTEL_XUSB2PR,
                                &orig_ports_available);

        pci_write_config_dword(xhci_pdev, USB_INTEL_XUSB2PR,
                                cpu_to_le32(ports_available));

        pr_info("set USB_INTEL_XUSB2PR old: 0x%04x, new: 0x%04x\n",
                        orig_ports_available, ports_available);
}

/*
 * Some devices dont support or have borcken get_als method
 * but still support set method.
 */
static void asus_wmi_set_als(void)
{
        asus_wmi_set_devstate(ASUS_WMI_DEVID_ALS_ENABLE, 1, NULL);
}

/* Hwmon device ***************************************************************/

static int asus_agfn_fan_speed_read(struct asus_wmi *asus, int fan,
                                          int *speed)
{
        struct agfn_fan_args args = {
                .agfn.len = sizeof(args),
                .agfn.mfun = ASUS_FAN_MFUN,
                .agfn.sfun = ASUS_FAN_SFUN_READ,
                .fan = fan,
                .speed = 0,
        };
        struct acpi_buffer input = { (acpi_size) sizeof(args), &args };
        int status;

        if (fan != 1)
                return -EINVAL;

        status = asus_wmi_evaluate_method_agfn(input);

        if (status || args.agfn.err)
                return -ENXIO;

        if (speed)
                *speed = args.speed;

        return 0;
}

static int asus_agfn_fan_speed_write(struct asus_wmi *asus, int fan,
                                     int *speed)
{
        struct agfn_fan_args args = {
                .agfn.len = sizeof(args),
                .agfn.mfun = ASUS_FAN_MFUN,
                .agfn.sfun = ASUS_FAN_SFUN_WRITE,
                .fan = fan,
                .speed = speed ?  *speed : 0,
        };
        struct acpi_buffer input = { (acpi_size) sizeof(args), &args };
        int status;

        /* 1: for setting 1st fan's speed 0: setting auto mode */
        if (fan != 1 && fan != 0)
                return -EINVAL;

        status = asus_wmi_evaluate_method_agfn(input);

        if (status || args.agfn.err)
                return -ENXIO;

        if (speed && fan == 1)
                asus->agfn_pwm = *speed;

        return 0;
}

/*
 * Check if we can read the speed of one fan. If true we assume we can also
 * control it.
 */
static bool asus_wmi_has_agfn_fan(struct asus_wmi *asus)
{
        int status;
        int speed;
        u32 value;

        status = asus_agfn_fan_speed_read(asus, 1, &speed);
        if (status != 0)
                return false;

        status = asus_wmi_get_devstate(asus, ASUS_WMI_DEVID_FAN_CTRL, &value);
        if (status != 0)
                return false;

        /*
         * We need to find a better way, probably using sfun,
         * bits or spec ...
         * Currently we disable it if:
         * - ASUS_WMI_UNSUPPORTED_METHOD is returned
         * - reverved bits are non-zero
         * - sfun and presence bit are not set
         */
        return !(value == ASUS_WMI_UNSUPPORTED_METHOD || value & 0xFFF80000
                 || (!asus->sfun && !(value & ASUS_WMI_DSTS_PRESENCE_BIT)));
}

static int asus_fan_set_auto(struct asus_wmi *asus)
{
        int status;
        u32 retval;

        switch (asus->fan_type) {
        case FAN_TYPE_SPEC83:
                status = asus_wmi_set_devstate(ASUS_WMI_DEVID_CPU_FAN_CTRL,
                                               0, &retval);
                if (status)
                        return status;

                if (retval != 1)
                        return -EIO;
                break;

        case FAN_TYPE_AGFN:
                status = asus_agfn_fan_speed_write(asus, 0, NULL);
                if (status)
                        return -ENXIO;
                break;

        default:
                return -ENXIO;
        }


        return 0;
}

static ssize_t pwm1_show(struct device *dev,
                               struct device_attribute *attr,
                               char *buf)
{
        struct asus_wmi *asus = dev_get_drvdata(dev);
        int err;
        int value;

        /* If we already set a value then just return it */
        if (asus->agfn_pwm >= 0)
                return sprintf(buf, "%d\n", asus->agfn_pwm);

        /*
         * If we haven't set already set a value through the AGFN interface,
         * we read a current value through the (now-deprecated) FAN_CTRL device.
         */
        err = asus_wmi_get_devstate(asus, ASUS_WMI_DEVID_FAN_CTRL, &value);
        if (err < 0)
                return err;

        value &= 0xFF;

        if (value == 1) /* Low Speed */
                value = 85;
        else if (value == 2)
                value = 170;
        else if (value == 3)
                value = 255;
        else if (value) {
                pr_err("Unknown fan speed %#x\n", value);
                value = -1;
        }

        return sprintf(buf, "%d\n", value);
}

static ssize_t pwm1_store(struct device *dev,
                                     struct device_attribute *attr,
                                     const char *buf, size_t count) {
        struct asus_wmi *asus = dev_get_drvdata(dev);
        int value;
        int state;
        int ret;

        ret = kstrtouint(buf, 10, &value);
        if (ret)
                return ret;

        value = clamp(value, 0, 255);

        state = asus_agfn_fan_speed_write(asus, 1, &value);
        if (state)
                pr_warn("Setting fan speed failed: %d\n", state);
        else
                asus->fan_pwm_mode = ASUS_FAN_CTRL_MANUAL;

        return count;
}

static ssize_t fan1_input_show(struct device *dev,
                                        struct device_attribute *attr,
                                        char *buf)
{
        struct asus_wmi *asus = dev_get_drvdata(dev);
        int value;
        int ret;

        switch (asus->fan_type) {
        case FAN_TYPE_SPEC83:
                ret = asus_wmi_get_devstate(asus, ASUS_WMI_DEVID_CPU_FAN_CTRL,
                                            &value);
                if (ret < 0)
                        return ret;

                value &= 0xffff;
                break;

        case FAN_TYPE_AGFN:
                /* no speed readable on manual mode */
                if (asus->fan_pwm_mode == ASUS_FAN_CTRL_MANUAL)
                        return -ENXIO;

                ret = asus_agfn_fan_speed_read(asus, 1, &value);
                if (ret) {
                        pr_warn("reading fan speed failed: %d\n", ret);
                        return -ENXIO;
                }
                break;

        default:
                return -ENXIO;
        }

        return sprintf(buf, "%d\n", value < 0 ? -1 : value*100);
}

static ssize_t pwm1_enable_show(struct device *dev,
                                                 struct device_attribute *attr,
                                                 char *buf)
{
        struct asus_wmi *asus = dev_get_drvdata(dev);

        /*
         * Just read back the cached pwm mode.
         *
         * For the CPU_FAN device, the spec indicates that we should be
         * able to read the device status and consult bit 19 to see if we
         * are in Full On or Automatic mode. However, this does not work
         * in practice on X532FL at least (the bit is always 0) and there's
         * also nothing in the DSDT to indicate that this behaviour exists.
         */
        return sprintf(buf, "%d\n", asus->fan_pwm_mode);
}

static ssize_t pwm1_enable_store(struct device *dev,
                                                  struct device_attribute *attr,
                                                  const char *buf, size_t count)
{
        struct asus_wmi *asus = dev_get_drvdata(dev);
        int status = 0;
        int state;
        int value;
        int ret;
        u32 retval;

        ret = kstrtouint(buf, 10, &state);
        if (ret)
                return ret;

        if (asus->fan_type == FAN_TYPE_SPEC83) {
                switch (state) { /* standard documented hwmon values */
                case ASUS_FAN_CTRL_FULLSPEED:
                        value = 1;
                        break;
                case ASUS_FAN_CTRL_AUTO:
                        value = 0;
                        break;
                default:
                        return -EINVAL;
                }

                ret = asus_wmi_set_devstate(ASUS_WMI_DEVID_CPU_FAN_CTRL,
                                            value, &retval);
                if (ret)
                        return ret;

                if (retval != 1)
                        return -EIO;
        } else if (asus->fan_type == FAN_TYPE_AGFN) {
                switch (state) {
                case ASUS_FAN_CTRL_MANUAL:
                        break;

                case ASUS_FAN_CTRL_AUTO:
                        status = asus_fan_set_auto(asus);
                        if (status)
                                return status;
                        break;

                default:
                        return -EINVAL;
                }
        }

        asus->fan_pwm_mode = state;
        return count;
}

static ssize_t fan1_label_show(struct device *dev,
                                          struct device_attribute *attr,
                                          char *buf)
{
        return sprintf(buf, "%s\n", ASUS_FAN_DESC);
}

static ssize_t asus_hwmon_temp1(struct device *dev,
                                struct device_attribute *attr,
                                char *buf)
{
        struct asus_wmi *asus = dev_get_drvdata(dev);
        u32 value;
        int err;

        err = asus_wmi_get_devstate(asus, ASUS_WMI_DEVID_THERMAL_CTRL, &value);
        if (err < 0)
                return err;

        return sprintf(buf, "%ld\n",
                       deci_kelvin_to_millicelsius(value & 0xFFFF));
}

/* Fan1 */
static DEVICE_ATTR_RW(pwm1);
static DEVICE_ATTR_RW(pwm1_enable);
static DEVICE_ATTR_RO(fan1_input);
static DEVICE_ATTR_RO(fan1_label);

/* Temperature */
static DEVICE_ATTR(temp1_input, S_IRUGO, asus_hwmon_temp1, NULL);

static struct attribute *hwmon_attributes[] = {
        &dev_attr_pwm1.attr,
        &dev_attr_pwm1_enable.attr,
        &dev_attr_fan1_input.attr,
        &dev_attr_fan1_label.attr,

        &dev_attr_temp1_input.attr,
        NULL
};

static umode_t asus_hwmon_sysfs_is_visible(struct kobject *kobj,
                                          struct attribute *attr, int idx)
{
        struct device *dev = container_of(kobj, struct device, kobj);
        struct asus_wmi *asus = dev_get_drvdata(dev->parent);
        u32 value = ASUS_WMI_UNSUPPORTED_METHOD;

        if (attr == &dev_attr_pwm1.attr) {
                if (asus->fan_type != FAN_TYPE_AGFN)
                        return 0;
        } else if (attr == &dev_attr_fan1_input.attr
            || attr == &dev_attr_fan1_label.attr
            || attr == &dev_attr_pwm1_enable.attr) {
                if (asus->fan_type == FAN_TYPE_NONE)
                        return 0;
        } else if (attr == &dev_attr_temp1_input.attr) {
                int err = asus_wmi_get_devstate(asus,
                                                ASUS_WMI_DEVID_THERMAL_CTRL,
                                                &value);

                if (err < 0)
                        return 0; /* can't return negative here */

                /*
                 * If the temperature value in deci-Kelvin is near the absolute
                 * zero temperature, something is clearly wrong
                 */
                if (value == 0 || value == 1)
                        return 0;
        }

        return attr->mode;
}

static const struct attribute_group hwmon_attribute_group = {
        .is_visible = asus_hwmon_sysfs_is_visible,
        .attrs = hwmon_attributes
};
__ATTRIBUTE_GROUPS(hwmon_attribute);

static int asus_wmi_hwmon_init(struct asus_wmi *asus)
{
        struct device *dev = &asus->platform_device->dev;
        struct device *hwmon;

        hwmon = devm_hwmon_device_register_with_groups(dev, "asus", asus,
                        hwmon_attribute_groups);

        if (IS_ERR(hwmon)) {
                pr_err("Could not register asus hwmon device\n");
                return PTR_ERR(hwmon);
        }
        return 0;
}

static int asus_wmi_fan_init(struct asus_wmi *asus)
{
        asus->fan_type = FAN_TYPE_NONE;
        asus->agfn_pwm = -1;

        if (asus_wmi_dev_is_present(asus, ASUS_WMI_DEVID_CPU_FAN_CTRL))
                asus->fan_type = FAN_TYPE_SPEC83;
        else if (asus_wmi_has_agfn_fan(asus))
                asus->fan_type = FAN_TYPE_AGFN;

        if (asus->fan_type == FAN_TYPE_NONE)
                return -ENODEV;

        asus_fan_set_auto(asus);
        asus->fan_pwm_mode = ASUS_FAN_CTRL_AUTO;
        return 0;
}

/* Fan mode *******************************************************************/

static int fan_boost_mode_check_present(struct asus_wmi *asus)
{
        u32 result;
        int err;

        asus->fan_boost_mode_available = false;

        err = asus_wmi_get_devstate(asus, ASUS_WMI_DEVID_FAN_BOOST_MODE,
                                    &result);
        if (err) {
                if (err == -ENODEV)
                        return 0;
                else
                        return err;
        }

        if ((result & ASUS_WMI_DSTS_PRESENCE_BIT) &&
                        (result & ASUS_FAN_BOOST_MODES_MASK)) {
                asus->fan_boost_mode_available = true;
                asus->fan_boost_mode_mask = result & ASUS_FAN_BOOST_MODES_MASK;
        }

        return 0;
}

static int fan_boost_mode_write(struct asus_wmi *asus)
{
        int err;
        u8 value;
        u32 retval;

        value = asus->fan_boost_mode;

        pr_info("Set fan boost mode: %u\n", value);
        err = asus_wmi_set_devstate(ASUS_WMI_DEVID_FAN_BOOST_MODE, value,
                                    &retval);
        if (err) {
                pr_warn("Failed to set fan boost mode: %d\n", err);
                return err;
        }

        if (retval != 1) {
                pr_warn("Failed to set fan boost mode (retval): 0x%x\n",
                        retval);
                return -EIO;
        }

        return 0;
}

static int fan_boost_mode_switch_next(struct asus_wmi *asus)
{
        u8 mask = asus->fan_boost_mode_mask;

        if (asus->fan_boost_mode == ASUS_FAN_BOOST_MODE_NORMAL) {
                if (mask & ASUS_FAN_BOOST_MODE_OVERBOOST_MASK)
                        asus->fan_boost_mode = ASUS_FAN_BOOST_MODE_OVERBOOST;
                else if (mask & ASUS_FAN_BOOST_MODE_SILENT_MASK)
                        asus->fan_boost_mode = ASUS_FAN_BOOST_MODE_SILENT;
        } else if (asus->fan_boost_mode == ASUS_FAN_BOOST_MODE_OVERBOOST) {
                if (mask & ASUS_FAN_BOOST_MODE_SILENT_MASK)
                        asus->fan_boost_mode = ASUS_FAN_BOOST_MODE_SILENT;
                else
                        asus->fan_boost_mode = ASUS_FAN_BOOST_MODE_NORMAL;
        } else {
                asus->fan_boost_mode = ASUS_FAN_BOOST_MODE_NORMAL;
        }

        return fan_boost_mode_write(asus);
}

static ssize_t fan_boost_mode_show(struct device *dev,
                                   struct device_attribute *attr, char *buf)
{
        struct asus_wmi *asus = dev_get_drvdata(dev);

        return scnprintf(buf, PAGE_SIZE, "%d\n", asus->fan_boost_mode);
}

static ssize_t fan_boost_mode_store(struct device *dev,
                                    struct device_attribute *attr,
                                    const char *buf, size_t count)
{
        int result;
        u8 new_mode;
        struct asus_wmi *asus = dev_get_drvdata(dev);
        u8 mask = asus->fan_boost_mode_mask;

        result = kstrtou8(buf, 10, &new_mode);
        if (result < 0) {
                pr_warn("Trying to store invalid value\n");
                return result;
        }

        if (new_mode == ASUS_FAN_BOOST_MODE_OVERBOOST) {
                if (!(mask & ASUS_FAN_BOOST_MODE_OVERBOOST_MASK))
                        return -EINVAL;
        } else if (new_mode == ASUS_FAN_BOOST_MODE_SILENT) {
                if (!(mask & ASUS_FAN_BOOST_MODE_SILENT_MASK))
                        return -EINVAL;
        } else if (new_mode != ASUS_FAN_BOOST_MODE_NORMAL) {
                return -EINVAL;
        }

        asus->fan_boost_mode = new_mode;
        fan_boost_mode_write(asus);

        return count;
}

// Fan boost mode: 0 - normal, 1 - overboost, 2 - silent
static DEVICE_ATTR_RW(fan_boost_mode);

/* Throttle thermal policy ****************************************************/

static int throttle_thermal_policy_check_present(struct asus_wmi *asus)
{
        u32 result;
        int err;

        asus->throttle_thermal_policy_available = false;

        err = asus_wmi_get_devstate(asus,
                                    ASUS_WMI_DEVID_THROTTLE_THERMAL_POLICY,
                                    &result);
        if (err) {
                if (err == -ENODEV)
                        return 0;
                return err;
        }

        if (result & ASUS_WMI_DSTS_PRESENCE_BIT)
                asus->throttle_thermal_policy_available = true;

        return 0;
}

static int throttle_thermal_policy_write(struct asus_wmi *asus)
{
        int err;
        u8 value;
        u32 retval;

        value = asus->throttle_thermal_policy_mode;

        err = asus_wmi_set_devstate(ASUS_WMI_DEVID_THROTTLE_THERMAL_POLICY,
                                    value, &retval);
        if (err) {
                pr_warn("Failed to set throttle thermal policy: %d\n", err);
                return err;
        }

        if (retval != 1) {
                pr_warn("Failed to set throttle thermal policy (retval): 0x%x\n",
                        retval);
                return -EIO;
        }

        return 0;
}

static int throttle_thermal_policy_set_default(struct asus_wmi *asus)
{
        if (!asus->throttle_thermal_policy_available)
                return 0;

        asus->throttle_thermal_policy_mode = ASUS_THROTTLE_THERMAL_POLICY_DEFAULT;
        return throttle_thermal_policy_write(asus);
}

static int throttle_thermal_policy_switch_next(struct asus_wmi *asus)
{
        u8 new_mode = asus->throttle_thermal_policy_mode + 1;

        if (new_mode > ASUS_THROTTLE_THERMAL_POLICY_SILENT)
                new_mode = ASUS_THROTTLE_THERMAL_POLICY_DEFAULT;

        asus->throttle_thermal_policy_mode = new_mode;
        return throttle_thermal_policy_write(asus);
}

static ssize_t throttle_thermal_policy_show(struct device *dev,
                                   struct device_attribute *attr, char *buf)
{
        struct asus_wmi *asus = dev_get_drvdata(dev);
        u8 mode = asus->throttle_thermal_policy_mode;

        return scnprintf(buf, PAGE_SIZE, "%d\n", mode);
}

static ssize_t throttle_thermal_policy_store(struct device *dev,
                                    struct device_attribute *attr,
                                    const char *buf, size_t count)
{
        int result;
        u8 new_mode;
        struct asus_wmi *asus = dev_get_drvdata(dev);

        result = kstrtou8(buf, 10, &new_mode);
        if (result < 0)
                return result;

        if (new_mode > ASUS_THROTTLE_THERMAL_POLICY_SILENT)
                return -EINVAL;

        asus->throttle_thermal_policy_mode = new_mode;
        throttle_thermal_policy_write(asus);

        return count;
}

// Throttle thermal policy: 0 - default, 1 - overboost, 2 - silent
static DEVICE_ATTR_RW(throttle_thermal_policy);

/* Backlight ******************************************************************/

static int read_backlight_power(struct asus_wmi *asus)
{
        int ret;

        if (asus->driver->quirks->store_backlight_power)
                ret = !asus->driver->panel_power;
        else
                ret = asus_wmi_get_devstate_simple(asus,
                                                   ASUS_WMI_DEVID_BACKLIGHT);

        if (ret < 0)
                return ret;

        return ret ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
}

static int read_brightness_max(struct asus_wmi *asus)
{
        u32 retval;
        int err;

        err = asus_wmi_get_devstate(asus, ASUS_WMI_DEVID_BRIGHTNESS, &retval);
        if (err < 0)
                return err;

        retval = retval & ASUS_WMI_DSTS_MAX_BRIGTH_MASK;
        retval >>= 8;

        if (!retval)
                return -ENODEV;

        return retval;
}

static int read_brightness(struct backlight_device *bd)
{
        struct asus_wmi *asus = bl_get_data(bd);
        u32 retval;
        int err;

        err = asus_wmi_get_devstate(asus, ASUS_WMI_DEVID_BRIGHTNESS, &retval);
        if (err < 0)
                return err;

        return retval & ASUS_WMI_DSTS_BRIGHTNESS_MASK;
}

static u32 get_scalar_command(struct backlight_device *bd)
{
        struct asus_wmi *asus = bl_get_data(bd);
        u32 ctrl_param = 0;

        if ((asus->driver->brightness < bd->props.brightness) ||
            bd->props.brightness == bd->props.max_brightness)
                ctrl_param = 0x00008001;
        else if ((asus->driver->brightness > bd->props.brightness) ||
                 bd->props.brightness == 0)
                ctrl_param = 0x00008000;

        asus->driver->brightness = bd->props.brightness;

        return ctrl_param;
}

static int update_bl_status(struct backlight_device *bd)
{
        struct asus_wmi *asus = bl_get_data(bd);
        u32 ctrl_param;
        int power, err = 0;

        power = read_backlight_power(asus);
        if (power != -ENODEV && bd->props.power != power) {
                ctrl_param = !!(bd->props.power == FB_BLANK_UNBLANK);
                err = asus_wmi_set_devstate(ASUS_WMI_DEVID_BACKLIGHT,
                                            ctrl_param, NULL);
                if (asus->driver->quirks->store_backlight_power)
                        asus->driver->panel_power = bd->props.power;

                /* When using scalar brightness, updating the brightness
                 * will mess with the backlight power */
                if (asus->driver->quirks->scalar_panel_brightness)
                        return err;
        }

        if (asus->driver->quirks->scalar_panel_brightness)
                ctrl_param = get_scalar_command(bd);
        else
                ctrl_param = bd->props.brightness;

        err = asus_wmi_set_devstate(ASUS_WMI_DEVID_BRIGHTNESS,
                                    ctrl_param, NULL);

        return err;
}

static const struct backlight_ops asus_wmi_bl_ops = {
        .get_brightness = read_brightness,
        .update_status = update_bl_status,
};

static int asus_wmi_backlight_notify(struct asus_wmi *asus, int code)
{
        struct backlight_device *bd = asus->backlight_device;
        int old = bd->props.brightness;
        int new = old;

        if (code >= NOTIFY_BRNUP_MIN && code <= NOTIFY_BRNUP_MAX)
                new = code - NOTIFY_BRNUP_MIN + 1;
        else if (code >= NOTIFY_BRNDOWN_MIN && code <= NOTIFY_BRNDOWN_MAX)
                new = code - NOTIFY_BRNDOWN_MIN;

        bd->props.brightness = new;
        backlight_update_status(bd);
        backlight_force_update(bd, BACKLIGHT_UPDATE_HOTKEY);

        return old;
}

static int asus_wmi_backlight_init(struct asus_wmi *asus)
{
        struct backlight_device *bd;
        struct backlight_properties props;
        int max;
        int power;

        max = read_brightness_max(asus);
        if (max < 0)
                return max;

        power = read_backlight_power(asus);
        if (power == -ENODEV)
                power = FB_BLANK_UNBLANK;
        else if (power < 0)
                return power;

        memset(&props, 0, sizeof(struct backlight_properties));
        props.type = BACKLIGHT_PLATFORM;
        props.max_brightness = max;
        bd = backlight_device_register(asus->driver->name,
                                       &asus->platform_device->dev, asus,
                                       &asus_wmi_bl_ops, &props);
        if (IS_ERR(bd)) {
                pr_err("Could not register backlight device\n");
                return PTR_ERR(bd);
        }

        asus->backlight_device = bd;

        if (asus->driver->quirks->store_backlight_power)
                asus->driver->panel_power = power;

        bd->props.brightness = read_brightness(bd);
        bd->props.power = power;
        backlight_update_status(bd);

        asus->driver->brightness = bd->props.brightness;

        return 0;
}

static void asus_wmi_backlight_exit(struct asus_wmi *asus)
{
        backlight_device_unregister(asus->backlight_device);

        asus->backlight_device = NULL;
}

static int is_display_toggle(int code)
{
        /* display toggle keys */
        if ((code >= 0x61 && code <= 0x67) ||
            (code >= 0x8c && code <= 0x93) ||
            (code >= 0xa0 && code <= 0xa7) ||
            (code >= 0xd0 && code <= 0xd5))
                return 1;

        return 0;
}

/* Fn-lock ********************************************************************/

static bool asus_wmi_has_fnlock_key(struct asus_wmi *asus)
{
        u32 result;

        asus_wmi_get_devstate(asus, ASUS_WMI_DEVID_FNLOCK, &result);

        return (result & ASUS_WMI_DSTS_PRESENCE_BIT) &&
                !(result & ASUS_WMI_FNLOCK_BIOS_DISABLED);
}

static void asus_wmi_fnlock_update(struct asus_wmi *asus)
{
        int mode = asus->fnlock_locked;

        asus_wmi_set_devstate(ASUS_WMI_DEVID_FNLOCK, mode, NULL);
}

/* WMI events *****************************************************************/

static int asus_wmi_get_event_code(u32 value)
{
        struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
        union acpi_object *obj;
        acpi_status status;
        int code;

        status = wmi_get_event_data(value, &response);
        if (ACPI_FAILURE(status)) {
                pr_warn("Failed to get WMI notify code: %s\n",
                                acpi_format_exception(status));
                return -EIO;
        }

        obj = (union acpi_object *)response.pointer;

        if (obj && obj->type == ACPI_TYPE_INTEGER)
                code = (int)(obj->integer.value & WMI_EVENT_MASK);
        else
                code = -EIO;

        kfree(obj);
        return code;
}

static void asus_wmi_handle_event_code(int code, struct asus_wmi *asus)
{
        unsigned int key_value = 1;
        bool autorelease = 1;
        int result, orig_code;

        orig_code = code;

        if (asus->driver->key_filter) {
                asus->driver->key_filter(asus->driver, &code, &key_value,
                                         &autorelease);
                if (code == ASUS_WMI_KEY_IGNORE)
                        return;
        }

        if (code >= NOTIFY_BRNUP_MIN && code <= NOTIFY_BRNUP_MAX)
                code = ASUS_WMI_BRN_UP;
        else if (code >= NOTIFY_BRNDOWN_MIN && code <= NOTIFY_BRNDOWN_MAX)
                code = ASUS_WMI_BRN_DOWN;

        if (code == ASUS_WMI_BRN_DOWN || code == ASUS_WMI_BRN_UP) {
                if (acpi_video_get_backlight_type() == acpi_backlight_vendor) {
                        asus_wmi_backlight_notify(asus, orig_code);
                        return;
                }
        }

        if (code == NOTIFY_KBD_BRTUP) {
                kbd_led_set_by_kbd(asus, asus->kbd_led_wk + 1);
                return;
        }
        if (code == NOTIFY_KBD_BRTDWN) {
                kbd_led_set_by_kbd(asus, asus->kbd_led_wk - 1);
                return;
        }
        if (code == NOTIFY_KBD_BRTTOGGLE) {
                if (asus->kbd_led_wk == asus->kbd_led.max_brightness)
                        kbd_led_set_by_kbd(asus, 0);
                else
                        kbd_led_set_by_kbd(asus, asus->kbd_led_wk + 1);
                return;
        }

        if (code == NOTIFY_FNLOCK_TOGGLE) {
                asus->fnlock_locked = !asus->fnlock_locked;
                asus_wmi_fnlock_update(asus);
                return;
        }

        if (asus->driver->quirks->use_kbd_dock_devid && code == NOTIFY_KBD_DOCK_CHANGE) {
                result = asus_wmi_get_devstate_simple(asus,
                                                      ASUS_WMI_DEVID_KBD_DOCK);
                if (result >= 0) {
                        input_report_switch(asus->inputdev, SW_TABLET_MODE,
                                            !result);
                        input_sync(asus->inputdev);
                }
                return;
        }

        if (asus->fan_boost_mode_available && code == NOTIFY_KBD_FBM) {
                fan_boost_mode_switch_next(asus);
                return;
        }

        if (asus->throttle_thermal_policy_available && code == NOTIFY_KBD_TTP) {
                throttle_thermal_policy_switch_next(asus);
                return;
        }

        if (is_display_toggle(code) && asus->driver->quirks->no_display_toggle)
                return;

        if (!sparse_keymap_report_event(asus->inputdev, code,
                                        key_value, autorelease))
                pr_info("Unknown key %x pressed\n", code);
}

static void asus_wmi_notify(u32 value, void *context)
{
        struct asus_wmi *asus = context;
        int code;
        int i;

        for (i = 0; i < WMI_EVENT_QUEUE_SIZE + 1; i++) {
                code = asus_wmi_get_event_code(value);
                if (code < 0) {
                        pr_warn("Failed to get notify code: %d\n", code);
                        return;
                }

                if (code == WMI_EVENT_QUEUE_END || code == WMI_EVENT_MASK)
                        return;

                asus_wmi_handle_event_code(code, asus);

                /*
                 * Double check that queue is present:
                 * ATK (with queue) uses 0xff, ASUSWMI (without) 0xd2.
                 */
                if (!asus->wmi_event_queue || value != WMI_EVENT_VALUE_ATK)
                        return;
        }

        pr_warn("Failed to process event queue, last code: 0x%x\n", code);
}

static int asus_wmi_notify_queue_flush(struct asus_wmi *asus)
{
        int code;
        int i;

        for (i = 0; i < WMI_EVENT_QUEUE_SIZE + 1; i++) {
                code = asus_wmi_get_event_code(WMI_EVENT_VALUE_ATK);
                if (code < 0) {
                        pr_warn("Failed to get event during flush: %d\n", code);
                        return code;
                }

                if (code == WMI_EVENT_QUEUE_END || code == WMI_EVENT_MASK)
                        return 0;
        }

        pr_warn("Failed to flush event queue\n");
        return -EIO;
}

/* Sysfs **********************************************************************/

static ssize_t store_sys_wmi(struct asus_wmi *asus, int devid,
                             const char *buf, size_t count)
{
        u32 retval;
        int err, value;

        value = asus_wmi_get_devstate_simple(asus, devid);
        if (value < 0)
                return value;

        err = kstrtoint(buf, 0, &value);
        if (err)
                return err;

        err = asus_wmi_set_devstate(devid, value, &retval);
        if (err < 0)
                return err;

        return count;
}

static ssize_t show_sys_wmi(struct asus_wmi *asus, int devid, char *buf)
{
        int value = asus_wmi_get_devstate_simple(asus, devid);

        if (value < 0)
                return value;

        return sprintf(buf, "%d\n", value);
}

#define ASUS_WMI_CREATE_DEVICE_ATTR(_name, _mode, _cm)                  \
        static ssize_t show_##_name(struct device *dev,                 \
                                    struct device_attribute *attr,      \
                                    char *buf)                          \
        {                                                               \
                struct asus_wmi *asus = dev_get_drvdata(dev);           \
                                                                        \
                return show_sys_wmi(asus, _cm, buf);                    \
        }                                                               \
        static ssize_t store_##_name(struct device *dev,                \
                                     struct device_attribute *attr,     \
                                     const char *buf, size_t count)     \
        {                                                               \
                struct asus_wmi *asus = dev_get_drvdata(dev);           \
                                                                        \
                return store_sys_wmi(asus, _cm, buf, count);            \
        }                                                               \
        static struct device_attribute dev_attr_##_name = {             \
                .attr = {                                               \
                        .name = __stringify(_name),                     \
                        .mode = _mode },                                \
                .show   = show_##_name,                                 \
                .store  = store_##_name,                                \
        }

ASUS_WMI_CREATE_DEVICE_ATTR(touchpad, 0644, ASUS_WMI_DEVID_TOUCHPAD);
ASUS_WMI_CREATE_DEVICE_ATTR(camera, 0644, ASUS_WMI_DEVID_CAMERA);
ASUS_WMI_CREATE_DEVICE_ATTR(cardr, 0644, ASUS_WMI_DEVID_CARDREADER);
ASUS_WMI_CREATE_DEVICE_ATTR(lid_resume, 0644, ASUS_WMI_DEVID_LID_RESUME);
ASUS_WMI_CREATE_DEVICE_ATTR(als_enable, 0644, ASUS_WMI_DEVID_ALS_ENABLE);

static ssize_t cpufv_store(struct device *dev, struct device_attribute *attr,
                           const char *buf, size_t count)
{
        int value, rv;

        rv = kstrtoint(buf, 0, &value);
        if (rv)
                return rv;

        if (value < 0 || value > 2)
                return -EINVAL;

        rv = asus_wmi_evaluate_method(ASUS_WMI_METHODID_CFVS, value, 0, NULL);
        if (rv < 0)
                return rv;

        return count;
}

static DEVICE_ATTR_WO(cpufv);

static struct attribute *platform_attributes[] = {
        &dev_attr_cpufv.attr,
        &dev_attr_camera.attr,
        &dev_attr_cardr.attr,
        &dev_attr_touchpad.attr,
        &dev_attr_lid_resume.attr,
        &dev_attr_als_enable.attr,
        &dev_attr_fan_boost_mode.attr,
        &dev_attr_throttle_thermal_policy.attr,
        NULL
};

static umode_t asus_sysfs_is_visible(struct kobject *kobj,
                                    struct attribute *attr, int idx)
{
        struct device *dev = container_of(kobj, struct device, kobj);
        struct asus_wmi *asus = dev_get_drvdata(dev);
        bool ok = true;
        int devid = -1;

        if (attr == &dev_attr_camera.attr)
                devid = ASUS_WMI_DEVID_CAMERA;
        else if (attr == &dev_attr_cardr.attr)
                devid = ASUS_WMI_DEVID_CARDREADER;
        else if (attr == &dev_attr_touchpad.attr)
                devid = ASUS_WMI_DEVID_TOUCHPAD;
        else if (attr == &dev_attr_lid_resume.attr)
                devid = ASUS_WMI_DEVID_LID_RESUME;
        else if (attr == &dev_attr_als_enable.attr)
                devid = ASUS_WMI_DEVID_ALS_ENABLE;
        else if (attr == &dev_attr_fan_boost_mode.attr)
                ok = asus->fan_boost_mode_available;
        else if (attr == &dev_attr_throttle_thermal_policy.attr)
                ok = asus->throttle_thermal_policy_available;

        if (devid != -1)
                ok = !(asus_wmi_get_devstate_simple(asus, devid) < 0);

        return ok ? attr->mode : 0;
}

static const struct attribute_group platform_attribute_group = {
        .is_visible = asus_sysfs_is_visible,
        .attrs = platform_attributes
};

static void asus_wmi_sysfs_exit(struct platform_device *device)
{
        sysfs_remove_group(&device->dev.kobj, &platform_attribute_group);
}

static int asus_wmi_sysfs_init(struct platform_device *device)
{
        return sysfs_create_group(&device->dev.kobj, &platform_attribute_group);
}

/* Platform device ************************************************************/

static int asus_wmi_platform_init(struct asus_wmi *asus)
{
        struct device *dev = &asus->platform_device->dev;
        char *wmi_uid;
        int rv;

        /* INIT enable hotkeys on some models */
        if (!asus_wmi_evaluate_method(ASUS_WMI_METHODID_INIT, 0, 0, &rv))
                pr_info("Initialization: %#x\n", rv);

        /* We don't know yet what to do with this version... */
        if (!asus_wmi_evaluate_method(ASUS_WMI_METHODID_SPEC, 0, 0x9, &rv)) {
                pr_info("BIOS WMI version: %d.%d\n", rv >> 16, rv & 0xFF);
                asus->spec = rv;
        }

        /*
         * The SFUN method probably allows the original driver to get the list
         * of features supported by a given model. For now, 0x0100 or 0x0800
         * bit signifies that the laptop is equipped with a Wi-Fi MiniPCI card.
         * The significance of others is yet to be found.
         */
        if (!asus_wmi_evaluate_method(ASUS_WMI_METHODID_SFUN, 0, 0, &rv)) {
                pr_info("SFUN value: %#x\n", rv);
                asus->sfun = rv;
        }

        /*
         * Eee PC and Notebooks seems to have different method_id for DSTS,
         * but it may also be related to the BIOS's SPEC.
         * Note, on most Eeepc, there is no way to check if a method exist
         * or note, while on notebooks, they returns 0xFFFFFFFE on failure,
         * but once again, SPEC may probably be used for that kind of things.
         *
         * Additionally at least TUF Gaming series laptops return nothing for
         * unknown methods, so the detection in this way is not possible.
         *
         * There is strong indication that only ACPI WMI devices that have _UID
         * equal to "ASUSWMI" use DCTS whereas those with "ATK" use DSTS.
         */
        wmi_uid = wmi_get_acpi_device_uid(ASUS_WMI_MGMT_GUID);
        if (!wmi_uid)
                return -ENODEV;

        if (!strcmp(wmi_uid, ASUS_ACPI_UID_ASUSWMI)) {
                dev_info(dev, "Detected ASUSWMI, use DCTS\n");
                asus->dsts_id = ASUS_WMI_METHODID_DCTS;
        } else {
                dev_info(dev, "Detected %s, not ASUSWMI, use DSTS\n", wmi_uid);
                asus->dsts_id = ASUS_WMI_METHODID_DSTS;
        }

        /*
         * Some devices can have multiple event codes stored in a queue before
         * the module load if it was unloaded intermittently after calling
         * the INIT method (enables event handling). The WMI notify handler is
         * expected to retrieve all event codes until a retrieved code equals
         * queue end marker (One or Ones). Old codes are flushed from the queue
         * upon module load. Not enabling this when it should be has minimal
         * visible impact so fall back if anything goes wrong.
         */
        wmi_uid = wmi_get_acpi_device_uid(asus->driver->event_guid);
        if (wmi_uid && !strcmp(wmi_uid, ASUS_ACPI_UID_ATK)) {
                dev_info(dev, "Detected ATK, enable event queue\n");

                if (!asus_wmi_notify_queue_flush(asus))
                        asus->wmi_event_queue = true;
        }

        /* CWAP allow to define the behavior of the Fn+F2 key,
         * this method doesn't seems to be present on Eee PCs */
        if (asus->driver->quirks->wapf >= 0)
                asus_wmi_set_devstate(ASUS_WMI_DEVID_CWAP,
                                      asus->driver->quirks->wapf, NULL);

        return 0;
}

/* debugfs ********************************************************************/

struct asus_wmi_debugfs_node {
        struct asus_wmi *asus;
        char *name;
        int (*show) (struct seq_file *m, void *data);
};

static int show_dsts(struct seq_file *m, void *data)
{
        struct asus_wmi *asus = m->private;
        int err;
        u32 retval = -1;

        err = asus_wmi_get_devstate(asus, asus->debug.dev_id, &retval);
        if (err < 0)
                return err;

        seq_printf(m, "DSTS(%#x) = %#x\n", asus->debug.dev_id, retval);

        return 0;
}

static int show_devs(struct seq_file *m, void *data)
{
        struct asus_wmi *asus = m->private;
        int err;
        u32 retval = -1;

        err = asus_wmi_set_devstate(asus->debug.dev_id, asus->debug.ctrl_param,
                                    &retval);
        if (err < 0)
                return err;

        seq_printf(m, "DEVS(%#x, %#x) = %#x\n", asus->debug.dev_id,
                   asus->debug.ctrl_param, retval);

        return 0;
}

static int show_call(struct seq_file *m, void *data)
{
        struct asus_wmi *asus = m->private;
        struct bios_args args = {
                .arg0 = asus->debug.dev_id,
                .arg1 = asus->debug.ctrl_param,
        };
        struct acpi_buffer input = { (acpi_size) sizeof(args), &args };
        struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
        union acpi_object *obj;
        acpi_status status;

        status = wmi_evaluate_method(ASUS_WMI_MGMT_GUID,
                                     0, asus->debug.method_id,
                                     &input, &output);

        if (ACPI_FAILURE(status))
                return -EIO;

        obj = (union acpi_object *)output.pointer;
        if (obj && obj->type == ACPI_TYPE_INTEGER)
                seq_printf(m, "%#x(%#x, %#x) = %#x\n", asus->debug.method_id,
                           asus->debug.dev_id, asus->debug.ctrl_param,
                           (u32) obj->integer.value);
        else
                seq_printf(m, "%#x(%#x, %#x) = t:%d\n", asus->debug.method_id,
                           asus->debug.dev_id, asus->debug.ctrl_param,
                           obj ? obj->type : -1);

        kfree(obj);

        return 0;
}

static struct asus_wmi_debugfs_node asus_wmi_debug_files[] = {
        {NULL, "devs", show_devs},
        {NULL, "dsts", show_dsts},
        {NULL, "call", show_call},
};

static int asus_wmi_debugfs_open(struct inode *inode, struct file *file)
{
        struct asus_wmi_debugfs_node *node = inode->i_private;

        return single_open(file, node->show, node->asus);
}

static const struct file_operations asus_wmi_debugfs_io_ops = {
        .owner = THIS_MODULE,
        .open = asus_wmi_debugfs_open,
        .read = seq_read,
        .llseek = seq_lseek,
        .release = single_release,
};

static void asus_wmi_debugfs_exit(struct asus_wmi *asus)
{
        debugfs_remove_recursive(asus->debug.root);
}

static void asus_wmi_debugfs_init(struct asus_wmi *asus)
{
        int i;

        asus->debug.root = debugfs_create_dir(asus->driver->name, NULL);

        debugfs_create_x32("method_id", S_IRUGO | S_IWUSR, asus->debug.root,
                           &asus->debug.method_id);

        debugfs_create_x32("dev_id", S_IRUGO | S_IWUSR, asus->debug.root,
                           &asus->debug.dev_id);

        debugfs_create_x32("ctrl_param", S_IRUGO | S_IWUSR, asus->debug.root,
                           &asus->debug.ctrl_param);

        for (i = 0; i < ARRAY_SIZE(asus_wmi_debug_files); i++) {
                struct asus_wmi_debugfs_node *node = &asus_wmi_debug_files[i];

                node->asus = asus;
                debugfs_create_file(node->name, S_IFREG | S_IRUGO,
                                    asus->debug.root, node,
                                    &asus_wmi_debugfs_io_ops);
        }
}

/* Init / exit ****************************************************************/

static int asus_wmi_add(struct platform_device *pdev)
{
        struct platform_driver *pdrv = to_platform_driver(pdev->dev.driver);
        struct asus_wmi_driver *wdrv = to_asus_wmi_driver(pdrv);
        struct asus_wmi *asus;
        const char *chassis_type;
        acpi_status status;
        int err;
        u32 result;

        asus = kzalloc(sizeof(struct asus_wmi), GFP_KERNEL);
        if (!asus)
                return -ENOMEM;

        asus->driver = wdrv;
        asus->platform_device = pdev;
        wdrv->platform_device = pdev;
        platform_set_drvdata(asus->platform_device, asus);

        if (wdrv->detect_quirks)
                wdrv->detect_quirks(asus->driver);

        err = asus_wmi_platform_init(asus);
        if (err)
                goto fail_platform;

        err = fan_boost_mode_check_present(asus);
        if (err)
                goto fail_fan_boost_mode;

        err = throttle_thermal_policy_check_present(asus);
        if (err)
                goto fail_throttle_thermal_policy;
        else
                throttle_thermal_policy_set_default(asus);

        err = asus_wmi_sysfs_init(asus->platform_device);
        if (err)
                goto fail_sysfs;

        err = asus_wmi_input_init(asus);
        if (err)
                goto fail_input;

        err = asus_wmi_fan_init(asus); /* probably no problems on error */

        err = asus_wmi_hwmon_init(asus);
        if (err)
                goto fail_hwmon;

        err = asus_wmi_led_init(asus);
        if (err)
                goto fail_leds;

        asus_wmi_get_devstate(asus, ASUS_WMI_DEVID_WLAN, &result);
        if (result & (ASUS_WMI_DSTS_PRESENCE_BIT | ASUS_WMI_DSTS_USER_BIT))
                asus->driver->wlan_ctrl_by_user = 1;

        if (!(asus->driver->wlan_ctrl_by_user && ashs_present())) {
                err = asus_wmi_rfkill_init(asus);
                if (err)
                        goto fail_rfkill;
        }

        if (asus->driver->quirks->wmi_force_als_set)
                asus_wmi_set_als();

        /* Some Asus desktop boards export an acpi-video backlight interface,
           stop this from showing up */
        chassis_type = dmi_get_system_info(DMI_CHASSIS_TYPE);
        if (chassis_type && !strcmp(chassis_type, "3"))
                acpi_video_set_dmi_backlight_type(acpi_backlight_vendor);

        if (asus->driver->quirks->wmi_backlight_power)
                acpi_video_set_dmi_backlight_type(acpi_backlight_vendor);

        if (asus->driver->quirks->wmi_backlight_native)
                acpi_video_set_dmi_backlight_type(acpi_backlight_native);

        if (asus->driver->quirks->xusb2pr)
                asus_wmi_set_xusb2pr(asus);

        if (acpi_video_get_backlight_type() == acpi_backlight_vendor) {
                err = asus_wmi_backlight_init(asus);
                if (err && err != -ENODEV)
                        goto fail_backlight;
        } else if (asus->driver->quirks->wmi_backlight_set_devstate)
                err = asus_wmi_set_devstate(ASUS_WMI_DEVID_BACKLIGHT, 2, NULL);

        if (asus_wmi_has_fnlock_key(asus)) {
                asus->fnlock_locked = true;
                asus_wmi_fnlock_update(asus);
        }

        status = wmi_install_notify_handler(asus->driver->event_guid,
                                            asus_wmi_notify, asus);
        if (ACPI_FAILURE(status)) {
                pr_err("Unable to register notify handler - %d\n", status);
                err = -ENODEV;
                goto fail_wmi_handler;
        }

        asus_wmi_battery_init(asus);

        asus_wmi_debugfs_init(asus);

        return 0;

fail_wmi_handler:
        asus_wmi_backlight_exit(asus);
fail_backlight:
        asus_wmi_rfkill_exit(asus);
fail_rfkill:
        asus_wmi_led_exit(asus);
fail_leds:
fail_hwmon:
        asus_wmi_input_exit(asus);
fail_input:
        asus_wmi_sysfs_exit(asus->platform_device);
fail_sysfs:
fail_throttle_thermal_policy:
fail_fan_boost_mode:
fail_platform:
        kfree(asus);
        return err;
}

static int asus_wmi_remove(struct platform_device *device)
{
        struct asus_wmi *asus;

        asus = platform_get_drvdata(device);
        wmi_remove_notify_handler(asus->driver->event_guid);
        asus_wmi_backlight_exit(asus);
        asus_wmi_input_exit(asus);
        asus_wmi_led_exit(asus);
        asus_wmi_rfkill_exit(asus);
        asus_wmi_debugfs_exit(asus);
        asus_wmi_sysfs_exit(asus->platform_device);
        asus_fan_set_auto(asus);
        asus_wmi_battery_exit(asus);

        kfree(asus);
        return 0;
}

/* Platform driver - hibernate/resume callbacks *******************************/

static int asus_hotk_thaw(struct device *device)
{
        struct asus_wmi *asus = dev_get_drvdata(device);

        if (asus->wlan.rfkill) {
                bool wlan;

                /*
                 * Work around bios bug - acpi _PTS turns off the wireless led
                 * during suspend.  Normally it restores it on resume, but
                 * we should kick it ourselves in case hibernation is aborted.
                 */
                wlan = asus_wmi_get_devstate_simple(asus, ASUS_WMI_DEVID_WLAN);
                asus_wmi_set_devstate(ASUS_WMI_DEVID_WLAN, wlan, NULL);
        }

        return 0;
}

static int asus_hotk_resume(struct device *device)
{
        struct asus_wmi *asus = dev_get_drvdata(device);

        if (!IS_ERR_OR_NULL(asus->kbd_led.dev))
                kbd_led_update(asus);

        if (asus_wmi_has_fnlock_key(asus))
                asus_wmi_fnlock_update(asus);
        return 0;
}

static int asus_hotk_restore(struct device *device)
{
        struct asus_wmi *asus = dev_get_drvdata(device);
        int bl;

        /* Refresh both wlan rfkill state and pci hotplug */
        if (asus->wlan.rfkill)
                asus_rfkill_hotplug(asus);

        if (asus->bluetooth.rfkill) {
                bl = !asus_wmi_get_devstate_simple(asus,
                                                   ASUS_WMI_DEVID_BLUETOOTH);
                rfkill_set_sw_state(asus->bluetooth.rfkill, bl);
        }
        if (asus->wimax.rfkill) {
                bl = !asus_wmi_get_devstate_simple(asus, ASUS_WMI_DEVID_WIMAX);
                rfkill_set_sw_state(asus->wimax.rfkill, bl);
        }
        if (asus->wwan3g.rfkill) {
                bl = !asus_wmi_get_devstate_simple(asus, ASUS_WMI_DEVID_WWAN3G);
                rfkill_set_sw_state(asus->wwan3g.rfkill, bl);
        }
        if (asus->gps.rfkill) {
                bl = !asus_wmi_get_devstate_simple(asus, ASUS_WMI_DEVID_GPS);
                rfkill_set_sw_state(asus->gps.rfkill, bl);
        }
        if (asus->uwb.rfkill) {
                bl = !asus_wmi_get_devstate_simple(asus, ASUS_WMI_DEVID_UWB);
                rfkill_set_sw_state(asus->uwb.rfkill, bl);
        }
        if (!IS_ERR_OR_NULL(asus->kbd_led.dev))
                kbd_led_update(asus);

        if (asus_wmi_has_fnlock_key(asus))
                asus_wmi_fnlock_update(asus);
        return 0;
}

static const struct dev_pm_ops asus_pm_ops = {
        .thaw = asus_hotk_thaw,
        .restore = asus_hotk_restore,
        .resume = asus_hotk_resume,
};

/* Registration ***************************************************************/

static int asus_wmi_probe(struct platform_device *pdev)
{
        struct platform_driver *pdrv = to_platform_driver(pdev->dev.driver);
        struct asus_wmi_driver *wdrv = to_asus_wmi_driver(pdrv);
        int ret;

        if (!wmi_has_guid(ASUS_WMI_MGMT_GUID)) {
                pr_warn("ASUS Management GUID not found\n");
                return -ENODEV;
        }

        if (wdrv->event_guid && !wmi_has_guid(wdrv->event_guid)) {
                pr_warn("ASUS Event GUID not found\n");
                return -ENODEV;
        }

        if (wdrv->probe) {
                ret = wdrv->probe(pdev);
                if (ret)
                        return ret;
        }

        return asus_wmi_add(pdev);
}

static bool used;

int __init_or_module asus_wmi_register_driver(struct asus_wmi_driver *driver)
{
        struct platform_driver *platform_driver;
        struct platform_device *platform_device;

        if (used)
                return -EBUSY;

        platform_driver = &driver->platform_driver;
        platform_driver->remove = asus_wmi_remove;
        platform_driver->driver.owner = driver->owner;
        platform_driver->driver.name = driver->name;
        platform_driver->driver.pm = &asus_pm_ops;

        platform_device = platform_create_bundle(platform_driver,
                                                 asus_wmi_probe,
                                                 NULL, 0, NULL, 0);
        if (IS_ERR(platform_device))
                return PTR_ERR(platform_device);

        used = true;
        return 0;
}
EXPORT_SYMBOL_GPL(asus_wmi_register_driver);

void asus_wmi_unregister_driver(struct asus_wmi_driver *driver)
{
        platform_device_unregister(driver->platform_device);
        platform_driver_unregister(&driver->platform_driver);
        used = false;
}
EXPORT_SYMBOL_GPL(asus_wmi_unregister_driver);

static int __init asus_wmi_init(void)
{
        pr_info("ASUS WMI generic driver loaded\n");
        return 0;
}

static void __exit asus_wmi_exit(void)
{
        pr_info("ASUS WMI generic driver unloaded\n");
}

module_init(asus_wmi_init);
module_exit(asus_wmi_exit);