/*
 * 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>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#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/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/platform_device.h>
#include <linux/thermal.h>
#include <linux/acpi.h>
#include <linux/dmi.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_KBD_BRTUP                0xc4
#define NOTIFY_KBD_BRTDWN               0xc5

/* WMI Methods */
#define ASUS_WMI_METHODID_SPEC          0x43455053 /* BIOS SPECification */
#define ASUS_WMI_METHODID_SFBD          0x44424653 /* Set First Boot Device */
#define ASUS_WMI_METHODID_GLCD          0x44434C47 /* Get LCD status */
#define ASUS_WMI_METHODID_GPID          0x44495047 /* Get Panel ID?? (Resol) */
#define ASUS_WMI_METHODID_QMOD          0x444F4D51 /* Quiet MODe */
#define ASUS_WMI_METHODID_SPLV          0x4C425053 /* Set Panel Light Value */
#define ASUS_WMI_METHODID_AGFN          0x4E464741 /* FaN? */
#define ASUS_WMI_METHODID_SFUN          0x4E554653 /* FUNCtionalities */
#define ASUS_WMI_METHODID_SDSP          0x50534453 /* Set DiSPlay output */
#define ASUS_WMI_METHODID_GDSP          0x50534447 /* Get DiSPlay output */
#define ASUS_WMI_METHODID_DEVP          0x50564544 /* DEVice Policy */
#define ASUS_WMI_METHODID_OSVR          0x5256534F /* OS VeRsion */
#define ASUS_WMI_METHODID_DSTS          0x53544344 /* Device STatuS */
#define ASUS_WMI_METHODID_DSTS2         0x53545344 /* Device STatuS #2*/
#define ASUS_WMI_METHODID_BSTS          0x53545342 /* Bios STatuS ? */
#define ASUS_WMI_METHODID_DEVS          0x53564544 /* DEVice Set */
#define ASUS_WMI_METHODID_CFVS          0x53564643 /* CPU Frequency Volt Set */
#define ASUS_WMI_METHODID_KBFT          0x5446424B /* KeyBoard FilTer */
#define ASUS_WMI_METHODID_INIT          0x54494E49 /* INITialize */
#define ASUS_WMI_METHODID_HKEY          0x59454B48 /* Hot KEY ?? */

#define ASUS_WMI_UNSUPPORTED_METHOD     0xFFFFFFFE

/* Wireless */
#define ASUS_WMI_DEVID_HW_SWITCH        0x00010001
#define ASUS_WMI_DEVID_WIRELESS_LED     0x00010002
#define ASUS_WMI_DEVID_CWAP             0x00010003
#define ASUS_WMI_DEVID_WLAN             0x00010011
#define ASUS_WMI_DEVID_WLAN_LED         0x00010012
#define ASUS_WMI_DEVID_BLUETOOTH        0x00010013
#define ASUS_WMI_DEVID_GPS              0x00010015
#define ASUS_WMI_DEVID_WIMAX            0x00010017
#define ASUS_WMI_DEVID_WWAN3G           0x00010019
#define ASUS_WMI_DEVID_UWB              0x00010021

/* Leds */
/* 0x000200XX and 0x000400XX */
#define ASUS_WMI_DEVID_LED1             0x00020011
#define ASUS_WMI_DEVID_LED2             0x00020012
#define ASUS_WMI_DEVID_LED3             0x00020013
#define ASUS_WMI_DEVID_LED4             0x00020014
#define ASUS_WMI_DEVID_LED5             0x00020015
#define ASUS_WMI_DEVID_LED6             0x00020016

/* Backlight and Brightness */
#define ASUS_WMI_DEVID_BACKLIGHT        0x00050011
#define ASUS_WMI_DEVID_BRIGHTNESS       0x00050012
#define ASUS_WMI_DEVID_KBD_BACKLIGHT    0x00050021
#define ASUS_WMI_DEVID_LIGHT_SENSOR     0x00050022 /* ?? */

/* Misc */
#define ASUS_WMI_DEVID_CAMERA           0x00060013

/* Storage */
#define ASUS_WMI_DEVID_CARDREADER       0x00080013

/* Input */
#define ASUS_WMI_DEVID_TOUCHPAD         0x00100011
#define ASUS_WMI_DEVID_TOUCHPAD_LED     0x00100012

/* Fan, Thermal */
#define ASUS_WMI_DEVID_THERMAL_CTRL     0x00110011
#define ASUS_WMI_DEVID_FAN_CTRL         0x00110012

/* Power */
#define ASUS_WMI_DEVID_PROCESSOR_STATE  0x00120012

/* Deep S3 / Resume on LID open */
#define ASUS_WMI_DEVID_LID_RESUME       0x00120031

/* DSTS masks */
#define ASUS_WMI_DSTS_STATUS_BIT        0x00000001
#define ASUS_WMI_DSTS_UNKNOWN_BIT       0x00000002
#define ASUS_WMI_DSTS_PRESENCE_BIT      0x00010000
#define ASUS_WMI_DSTS_USER_BIT          0x00020000
#define ASUS_WMI_DSTS_BIOS_BIT          0x00040000
#define ASUS_WMI_DSTS_BRIGHTNESS_MASK   0x000000FF
#define ASUS_WMI_DSTS_MAX_BRIGTH_MASK   0x0000FF00

#define ASUS_FAN_DESC                   "cpu_fan"
#define ASUS_FAN_MFUN                   0x13
#define ASUS_FAN_SFUN_READ              0x06
#define ASUS_FAN_SFUN_WRITE             0x07
#define ASUS_FAN_CTRL_MANUAL            1
#define ASUS_FAN_CTRL_AUTO              2

struct bios_args {
        u32 arg0;
        u32 arg1;
} __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 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;
};

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

        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 workqueue_struct *led_workqueue;
        struct work_struct tpd_led_work;
        struct work_struct kbd_led_work;
        struct work_struct wlan_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;

        bool asus_hwmon_fan_manual_mode;
        int asus_hwmon_num_fans;
        int asus_hwmon_pwm;

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

        struct asus_wmi_debug debug;

        struct asus_wmi_driver *driver;
};

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

        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;

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

        return 0;

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

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

        asus->inputdev = NULL;
}

static int asus_wmi_evaluate_method(u32 method_id, u32 arg0, u32 arg1,
                                    u32 *retval)
{
        struct bios_args args = {
                .arg0 = arg0,
                .arg1 = arg1,
        };
        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, 1, method_id,
                                     &input, &output);

        if (ACPI_FAILURE(status))
                goto exit;

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

        if (retval)
                *retval = tmp;

        kfree(obj);

exit:
        if (ACPI_FAILURE(status))
                return -EIO;

        if (tmp == ASUS_WMI_UNSUPPORTED_METHOD)
                return -ENODEV;

        return 0;
}

static int asus_wmi_evaluate_method_agfn(const struct acpi_buffer args)
{
        struct acpi_buffer input;
        u64 phys_addr;
        u32 retval;
        u32 status = -1;

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

        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);
}

/*
 * 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 work_struct *work)
{
        int ctrl_param = 0;
        struct asus_wmi *asus;

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

        /*
         * bits 0-2: level
         * bit 7: light on/off
         */
        if (asus->kbd_led_wk > 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) {
                if (level)
                        *level = retval & 0x7F;
                if (env)
                        *env = (retval >> 8) & 0x7F;
                retval = 0;
        }

        return retval;
}

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

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

        if (value > asus->kbd_led.max_brightness)
                value = asus->kbd_led.max_brightness;
        else if (value < 0)
                value = 0;

        asus->kbd_led_wk = value;
        queue_work(asus->led_workqueue, &asus->kbd_led_work);
}

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 int wlan_led_presence(struct asus_wmi *asus)
{
        u32 result;

        asus_wmi_get_devstate(asus, ASUS_WMI_DEVID_WIRELESS_LED, &result);

        return result & ASUS_WMI_DSTS_PRESENCE_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 asus_wmi_led_exit(struct asus_wmi *asus)
{
        if (!IS_ERR_OR_NULL(asus->kbd_led.dev))
                led_classdev_unregister(&asus->kbd_led);
        if (!IS_ERR_OR_NULL(asus->tpd_led.dev))
                led_classdev_unregister(&asus->tpd_led);
        if (!IS_ERR_OR_NULL(asus->wlan_led.dev))
                led_classdev_unregister(&asus->wlan_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;
        }

        led_val = kbd_led_read(asus, NULL, NULL);
        if (led_val >= 0) {
                INIT_WORK(&asus->kbd_led_work, kbd_led_update);

                asus->kbd_led_wk = led_val;
                asus->kbd_led.name = "asus::kbd_backlight";
                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 (wlan_led_presence(asus) && (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);
        }

error:
        if (rv)
                asus_wmi_led_exit(asus);

        return rv;
}


/*
 * 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) {
                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_SUCCESS(status)) {
                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);
        } else
                return -ENODEV;

        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_SUCCESS(status)) {
                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 = hotplug_slot->private;
        int result = asus_wmi_get_devstate_simple(asus, ASUS_WMI_DEVID_WLAN);

        if (result < 0)
                return result;

        *value = !!result;
        return 0;
}

static void asus_cleanup_pci_hotplug(struct hotplug_slot *hotplug_slot)
{
        kfree(hotplug_slot->info);
        kfree(hotplug_slot);
}

static struct hotplug_slot_ops asus_hotplug_slot_ops = {
        .owner = THIS_MODULE,
        .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 = kzalloc(sizeof(struct hotplug_slot), GFP_KERNEL);
        if (!asus->hotplug_slot)
                goto error_slot;

        asus->hotplug_slot->info = kzalloc(sizeof(struct hotplug_slot_info),
                                           GFP_KERNEL);
        if (!asus->hotplug_slot->info)
                goto error_info;

        asus->hotplug_slot->private = asus;
        asus->hotplug_slot->release = &asus_cleanup_pci_hotplug;
        asus->hotplug_slot->ops = &asus_hotplug_slot_ops;
        asus_get_adapter_status(asus->hotplug_slot,
                                &asus->hotplug_slot->info->adapter_status);

        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:
        kfree(asus->hotplug_slot->info);
error_info:
        kfree(asus->hotplug_slot);
        asus->hotplug_slot = NULL;
error_slot:
        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)
{
        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)
                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;
}

/*
 * Hwmon device
 */
static int asus_hwmon_agfn_fan_speed_read(struct asus_wmi *asus, int fan,
                                          int *speed)
{
        struct 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_hwmon_agfn_fan_speed_write(struct asus_wmi *asus, int fan,
                                     int *speed)
{
        struct 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->asus_hwmon_pwm = *speed;

        return 0;
}

/*
 * Check if we can read the speed of one fan. If true we assume we can also
 * control it.
 */
static int asus_hwmon_get_fan_number(struct asus_wmi *asus, int *num_fans)
{
        int status;
        int speed = 0;

        *num_fans = 0;

        status = asus_hwmon_agfn_fan_speed_read(asus, 1, &speed);
        if (!status)
                *num_fans = 1;

        return 0;
}

static int asus_hwmon_fan_set_auto(struct asus_wmi *asus)
{
        int status;

        status = asus_hwmon_agfn_fan_speed_write(asus, 0, NULL);
        if (status)
                return -ENXIO;

        asus->asus_hwmon_fan_manual_mode = false;

        return 0;
}

static int asus_hwmon_fan_rpm_show(struct device *dev, int fan)
{
        struct asus_wmi *asus = dev_get_drvdata(dev);
        int value;
        int ret;

        /* no speed readable on manual mode */
        if (asus->asus_hwmon_fan_manual_mode)
                return -ENXIO;

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

        return value;
}

static void asus_hwmon_pwm_show(struct asus_wmi *asus, int fan, int *value)
{
        int err;

        if (asus->asus_hwmon_pwm >= 0) {
                *value = asus->asus_hwmon_pwm;
                return;
        }

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

        *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;
        }
}

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

        asus_hwmon_pwm_show(asus, 0, &value);

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

        return count;
}

static ssize_t fan1_input_show(struct device *dev,
                                        struct device_attribute *attr,
                                        char *buf)
{
        int value = asus_hwmon_fan_rpm_show(dev, 0);

        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);

        if (asus->asus_hwmon_fan_manual_mode)
                return sprintf(buf, "%d\n", ASUS_FAN_CTRL_MANUAL);

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

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 ret;

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

        if (ret)
                return ret;

        if (state == ASUS_FAN_CTRL_MANUAL)
                asus->asus_hwmon_fan_manual_mode = true;
        else
                status = asus_hwmon_fan_set_auto(asus);

        if (status)
                return status;

        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;

        value = DECI_KELVIN_TO_CELSIUS((value & 0xFFFF)) * 1000;

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

/* 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 platform_device *pdev = to_platform_device(dev->parent);
        struct asus_wmi *asus = platform_get_drvdata(pdev);
        int dev_id = -1;
        int fan_attr = -1;
        u32 value = ASUS_WMI_UNSUPPORTED_METHOD;
        bool ok = true;

        if (attr == &dev_attr_pwm1.attr)
                dev_id = ASUS_WMI_DEVID_FAN_CTRL;
        else if (attr == &dev_attr_temp1_input.attr)
                dev_id = ASUS_WMI_DEVID_THERMAL_CTRL;


        if (attr == &dev_attr_fan1_input.attr
            || attr == &dev_attr_fan1_label.attr
            || attr == &dev_attr_pwm1.attr
            || attr == &dev_attr_pwm1_enable.attr) {
                fan_attr = 1;
        }

        if (dev_id != -1) {
                int err = asus_wmi_get_devstate(asus, dev_id, &value);

                if (err < 0 && fan_attr == -1)
                        return 0; /* can't return negative here */
        }

        if (dev_id == ASUS_WMI_DEVID_FAN_CTRL) {
                /*
                 * 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
                 */
                if (value == ASUS_WMI_UNSUPPORTED_METHOD || value & 0xFFF80000
                    || (!asus->sfun && !(value & ASUS_WMI_DSTS_PRESENCE_BIT)))
                        ok = false;
                else
                        ok = fan_attr <= asus->asus_hwmon_num_fans;
        } else if (dev_id == ASUS_WMI_DEVID_THERMAL_CTRL) {
                /* If value is zero, something is clearly wrong */
                if (!value)
                        ok = false;
        } else if (fan_attr <= asus->asus_hwmon_num_fans && fan_attr != -1) {
                ok = true;
        } else {
                ok = false;
        }

        return ok ? attr->mode : 0;
}

static 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 *hwmon;

        hwmon = hwmon_device_register_with_groups(&asus->platform_device->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;
}

/*
 * 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;
}

static void asus_wmi_notify(u32 value, void *context)
{
        struct asus_wmi *asus = context;
        struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
        union acpi_object *obj;
        acpi_status status;
        int code;
        int orig_code;
        unsigned int key_value = 1;
        bool autorelease = 1;

        status = wmi_get_event_data(value, &response);
        if (status != AE_OK) {
                pr_err("bad event status 0x%x\n", status);
                return;
        }

        obj = (union acpi_object *)response.pointer;

        if (!obj || obj->type != ACPI_TYPE_INTEGER)
                goto exit;

        code = obj->integer.value;
        orig_code = code;

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

        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);
                        goto exit;
                }
        }

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

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

exit:
        kfree(obj);
}

/*
 * Sys helpers
 */
static int parse_arg(const char *buf, unsigned long count, int *val)
{
        if (!count)
                return 0;
        if (sscanf(buf, "%i", val) != 1)
                return -EINVAL;
        return count;
}

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

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

        rv = parse_arg(buf, count, &value);
        err = asus_wmi_set_devstate(devid, value, &retval);

        if (err < 0)
                return err;

        return rv;
}

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);

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

        if (!count || sscanf(buf, "%i", &value) != 1)
                return -EINVAL;
        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(cpufv, S_IRUGO | S_IWUSR, NULL, store_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,
        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 platform_device *pdev = to_platform_device(dev);
        struct asus_wmi *asus = platform_get_drvdata(pdev);
        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;

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

        return ok ? attr->mode : 0;
}

static 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)
{
        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.
         */
        if (!asus_wmi_evaluate_method(ASUS_WMI_METHODID_DSTS, 0, 0, NULL))
                asus->dsts_id = ASUS_WMI_METHODID_DSTS;
        else
                asus->dsts_id = ASUS_WMI_METHODID_DSTS2;

        /* 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 asus_wmi_sysfs_init(asus->platform_device);
}

static void asus_wmi_platform_exit(struct asus_wmi *asus)
{
        asus_wmi_sysfs_exit(asus->platform_device);
}

/*
 * 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,
                                     1, 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 int asus_wmi_debugfs_init(struct asus_wmi *asus)
{
        struct dentry *dent;
        int i;

        asus->debug.root = debugfs_create_dir(asus->driver->name, NULL);
        if (!asus->debug.root) {
                pr_err("failed to create debugfs directory\n");
                goto error_debugfs;
        }

        dent = debugfs_create_x32("method_id", S_IRUGO | S_IWUSR,
                                  asus->debug.root, &asus->debug.method_id);
        if (!dent)
                goto error_debugfs;

        dent = debugfs_create_x32("dev_id", S_IRUGO | S_IWUSR,
                                  asus->debug.root, &asus->debug.dev_id);
        if (!dent)
                goto error_debugfs;

        dent = debugfs_create_x32("ctrl_param", S_IRUGO | S_IWUSR,
                                  asus->debug.root, &asus->debug.ctrl_param);
        if (!dent)
                goto error_debugfs;

        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;
                dent = debugfs_create_file(node->name, S_IFREG | S_IRUGO,
                                           asus->debug.root, node,
                                           &asus_wmi_debugfs_io_ops);
                if (!dent) {
                        pr_err("failed to create debug file: %s\n", node->name);
                        goto error_debugfs;
                }
        }

        return 0;

error_debugfs:
        asus_wmi_debugfs_exit(asus);

        return -ENOMEM;
}

static int asus_wmi_fan_init(struct asus_wmi *asus)
{
        int status;

        asus->asus_hwmon_pwm = -1;
        asus->asus_hwmon_num_fans = -1;
        asus->asus_hwmon_fan_manual_mode = false;

        status = asus_hwmon_get_fan_number(asus, &asus->asus_hwmon_num_fans);
        if (status) {
                asus->asus_hwmon_num_fans = 0;
                pr_warn("Could not determine number of fans: %d\n", status);
                return -ENXIO;
        }

        pr_info("Number of fans: %d\n", asus->asus_hwmon_num_fans);
        return 0;
}

/*
 * WMI Driver
 */
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 = asus_wmi_input_init(asus);
        if (err)
                goto fail_input;

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

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

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

        err = asus_wmi_rfkill_init(asus);
        if (err)
                goto fail_rfkill;

        /* 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 (acpi_video_get_backlight_type() == acpi_backlight_vendor) {
                err = asus_wmi_backlight_init(asus);
                if (err && err != -ENODEV)
                        goto fail_backlight;
        }

        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;
        }

        err = asus_wmi_debugfs_init(asus);
        if (err)
                goto fail_debugfs;

        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;

        return 0;

fail_debugfs:
        wmi_remove_notify_handler(asus->driver->event_guid);
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_platform_exit(asus);
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_platform_exit(asus);
        asus_hwmon_fan_set_auto(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))
                queue_work(asus->led_workqueue, &asus->kbd_led_work);

        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))
                queue_work(asus->led_workqueue, &asus->kbd_led_work);

        return 0;
}

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

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("Management GUID not found\n");
                return -ENODEV;
        }

        if (wdrv->event_guid && !wmi_has_guid(wdrv->event_guid)) {
                pr_warn("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)
{
        if (!wmi_has_guid(ASUS_WMI_MGMT_GUID)) {
                pr_info("Asus Management GUID not found\n");
                return -ENODEV;
        }

        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);