/*-*-linux-c-*-*/

/*
  Copyright (C) 2007,2008 Jonathan Woithe <jwoithe@just42.net>
  Copyright (C) 2008 Peter Gruber <nokos@gmx.net>
  Copyright (C) 2008 Tony Vroon <tony@linx.net>
  Based on earlier work:
    Copyright (C) 2003 Shane Spencer <shane@bogomip.com>
    Adrian Yee <brewt-fujitsu@brewt.org>

  Templated from msi-laptop.c and thinkpad_acpi.c which is copyright
  by its respective authors.

  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., 51 Franklin Street, Fifth Floor, Boston, MA
  02110-1301, USA.
 */

/*
 * fujitsu-laptop.c - Fujitsu laptop support, providing access to additional
 * features made available on a range of Fujitsu laptops including the
 * P2xxx/P5xxx/S6xxx/S7xxx series.
 *
 * This driver implements a vendor-specific backlight control interface for
 * Fujitsu laptops and provides support for hotkeys present on certain Fujitsu
 * laptops.
 *
 * This driver has been tested on a Fujitsu Lifebook S6410, S7020 and
 * P8010.  It should work on most P-series and S-series Lifebooks, but
 * YMMV.
 *
 * The module parameter use_alt_lcd_levels switches between different ACPI
 * brightness controls which are used by different Fujitsu laptops.  In most
 * cases the correct method is automatically detected. "use_alt_lcd_levels=1"
 * is applicable for a Fujitsu Lifebook S6410 if autodetection fails.
 *
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/acpi.h>
#include <linux/bitops.h>
#include <linux/dmi.h>
#include <linux/backlight.h>
#include <linux/fb.h>
#include <linux/input.h>
#include <linux/input/sparse-keymap.h>
#include <linux/kfifo.h>
#include <linux/leds.h>
#include <linux/platform_device.h>
#include <acpi/video.h>

#define FUJITSU_DRIVER_VERSION          "0.6.0"

#define FUJITSU_LCD_N_LEVELS            8

#define ACPI_FUJITSU_CLASS              "fujitsu"
#define ACPI_FUJITSU_BL_HID             "FUJ02B1"
#define ACPI_FUJITSU_BL_DRIVER_NAME     "Fujitsu laptop FUJ02B1 ACPI brightness driver"
#define ACPI_FUJITSU_BL_DEVICE_NAME     "Fujitsu FUJ02B1"
#define ACPI_FUJITSU_LAPTOP_HID         "FUJ02E3"
#define ACPI_FUJITSU_LAPTOP_DRIVER_NAME "Fujitsu laptop FUJ02E3 ACPI hotkeys driver"
#define ACPI_FUJITSU_LAPTOP_DEVICE_NAME "Fujitsu FUJ02E3"

#define ACPI_FUJITSU_NOTIFY_CODE        0x80

/* FUNC interface - command values */
#define FUNC_FLAGS                      BIT(12)
#define FUNC_LEDS                       (BIT(12) | BIT(0))
#define FUNC_BUTTONS                    (BIT(12) | BIT(1))
#define FUNC_BACKLIGHT                  (BIT(12) | BIT(2))

/* FUNC interface - responses */
#define UNSUPPORTED_CMD                 0x80000000

/* FUNC interface - status flags */
#define FLAG_RFKILL                     BIT(5)
#define FLAG_LID                        BIT(8)
#define FLAG_DOCK                       BIT(9)
#define FLAG_TOUCHPAD_TOGGLE            BIT(26)
#define FLAG_MICMUTE                    BIT(29)
#define FLAG_SOFTKEYS                   (FLAG_RFKILL | FLAG_TOUCHPAD_TOGGLE | FLAG_MICMUTE)

/* FUNC interface - LED control */
#define FUNC_LED_OFF                    BIT(0)
#define FUNC_LED_ON                     (BIT(0) | BIT(16) | BIT(17))
#define LOGOLAMP_POWERON                BIT(13)
#define LOGOLAMP_ALWAYS                 BIT(14)
#define KEYBOARD_LAMPS                  BIT(8)
#define RADIO_LED_ON                    BIT(5)
#define ECO_LED                         BIT(16)
#define ECO_LED_ON                      BIT(19)

/* FUNC interface - backlight power control */
#define BACKLIGHT_PARAM_POWER           BIT(2)
#define BACKLIGHT_OFF                   (BIT(0) | BIT(1))
#define BACKLIGHT_ON                    0

/* Scancodes read from the GIRB register */
#define KEY1_CODE                       0x410
#define KEY2_CODE                       0x411
#define KEY3_CODE                       0x412
#define KEY4_CODE                       0x413
#define KEY5_CODE                       0x420

/* Hotkey ringbuffer limits */
#define MAX_HOTKEY_RINGBUFFER_SIZE      100
#define RINGBUFFERSIZE                  40

/* Module parameters */
static int use_alt_lcd_levels = -1;
static bool disable_brightness_adjust;

/* Device controlling the backlight and associated keys */
struct fujitsu_bl {
        struct input_dev *input;
        char phys[32];
        struct backlight_device *bl_device;
        unsigned int max_brightness;
        unsigned int brightness_level;
};

static struct fujitsu_bl *fujitsu_bl;

/* Device used to access hotkeys and other features on the laptop */
struct fujitsu_laptop {
        struct input_dev *input;
        char phys[32];
        struct platform_device *pf_device;
        struct kfifo fifo;
        spinlock_t fifo_lock;
        int flags_supported;
        int flags_state;
};

static struct acpi_device *fext;

/* Fujitsu ACPI interface function */

static int call_fext_func(struct acpi_device *device,
                          int func, int op, int feature, int state)
{
        union acpi_object params[4] = {
                { .integer.type = ACPI_TYPE_INTEGER, .integer.value = func },
                { .integer.type = ACPI_TYPE_INTEGER, .integer.value = op },
                { .integer.type = ACPI_TYPE_INTEGER, .integer.value = feature },
                { .integer.type = ACPI_TYPE_INTEGER, .integer.value = state }
        };
        struct acpi_object_list arg_list = { 4, params };
        unsigned long long value;
        acpi_status status;

        status = acpi_evaluate_integer(device->handle, "FUNC", &arg_list,
                                       &value);
        if (ACPI_FAILURE(status)) {
                acpi_handle_err(device->handle, "Failed to evaluate FUNC\n");
                return -ENODEV;
        }

        acpi_handle_debug(device->handle,
                          "FUNC 0x%x (args 0x%x, 0x%x, 0x%x) returned 0x%x\n",
                          func, op, feature, state, (int)value);
        return value;
}

/* Hardware access for LCD brightness control */

static int set_lcd_level(struct acpi_device *device, int level)
{
        struct fujitsu_bl *priv = acpi_driver_data(device);
        acpi_status status;
        char *method;

        switch (use_alt_lcd_levels) {
        case -1:
                if (acpi_has_method(device->handle, "SBL2"))
                        method = "SBL2";
                else
                        method = "SBLL";
                break;
        case 1:
                method = "SBL2";
                break;
        default:
                method = "SBLL";
                break;
        }

        acpi_handle_debug(device->handle, "set lcd level via %s [%d]\n", method,
                          level);

        if (level < 0 || level >= priv->max_brightness)
                return -EINVAL;

        status = acpi_execute_simple_method(device->handle, method, level);
        if (ACPI_FAILURE(status)) {
                acpi_handle_err(device->handle, "Failed to evaluate %s\n",
                                method);
                return -ENODEV;
        }

        priv->brightness_level = level;

        return 0;
}

static int get_lcd_level(struct acpi_device *device)
{
        struct fujitsu_bl *priv = acpi_driver_data(device);
        unsigned long long state = 0;
        acpi_status status = AE_OK;

        acpi_handle_debug(device->handle, "get lcd level via GBLL\n");

        status = acpi_evaluate_integer(device->handle, "GBLL", NULL, &state);
        if (ACPI_FAILURE(status))
                return 0;

        priv->brightness_level = state & 0x0fffffff;

        return priv->brightness_level;
}

static int get_max_brightness(struct acpi_device *device)
{
        struct fujitsu_bl *priv = acpi_driver_data(device);
        unsigned long long state = 0;
        acpi_status status = AE_OK;

        acpi_handle_debug(device->handle, "get max lcd level via RBLL\n");

        status = acpi_evaluate_integer(device->handle, "RBLL", NULL, &state);
        if (ACPI_FAILURE(status))
                return -1;

        priv->max_brightness = state;

        return priv->max_brightness;
}

/* Backlight device stuff */

static int bl_get_brightness(struct backlight_device *b)
{
        struct acpi_device *device = bl_get_data(b);

        return b->props.power == FB_BLANK_POWERDOWN ? 0 : get_lcd_level(device);
}

static int bl_update_status(struct backlight_device *b)
{
        struct acpi_device *device = bl_get_data(b);

        if (fext) {
                if (b->props.power == FB_BLANK_POWERDOWN)
                        call_fext_func(fext, FUNC_BACKLIGHT, 0x1,
                                       BACKLIGHT_PARAM_POWER, BACKLIGHT_OFF);
                else
                        call_fext_func(fext, FUNC_BACKLIGHT, 0x1,
                                       BACKLIGHT_PARAM_POWER, BACKLIGHT_ON);
        }

        return set_lcd_level(device, b->props.brightness);
}

static const struct backlight_ops fujitsu_bl_ops = {
        .get_brightness = bl_get_brightness,
        .update_status = bl_update_status,
};

static ssize_t lid_show(struct device *dev, struct device_attribute *attr,
                        char *buf)
{
        struct fujitsu_laptop *priv = dev_get_drvdata(dev);

        if (!(priv->flags_supported & FLAG_LID))
                return sprintf(buf, "unknown\n");
        if (priv->flags_state & FLAG_LID)
                return sprintf(buf, "open\n");
        else
                return sprintf(buf, "closed\n");
}

static ssize_t dock_show(struct device *dev, struct device_attribute *attr,
                         char *buf)
{
        struct fujitsu_laptop *priv = dev_get_drvdata(dev);

        if (!(priv->flags_supported & FLAG_DOCK))
                return sprintf(buf, "unknown\n");
        if (priv->flags_state & FLAG_DOCK)
                return sprintf(buf, "docked\n");
        else
                return sprintf(buf, "undocked\n");
}

static ssize_t radios_show(struct device *dev, struct device_attribute *attr,
                           char *buf)
{
        struct fujitsu_laptop *priv = dev_get_drvdata(dev);

        if (!(priv->flags_supported & FLAG_RFKILL))
                return sprintf(buf, "unknown\n");
        if (priv->flags_state & FLAG_RFKILL)
                return sprintf(buf, "on\n");
        else
                return sprintf(buf, "killed\n");
}

static DEVICE_ATTR_RO(lid);
static DEVICE_ATTR_RO(dock);
static DEVICE_ATTR_RO(radios);

static struct attribute *fujitsu_pf_attributes[] = {
        &dev_attr_lid.attr,
        &dev_attr_dock.attr,
        &dev_attr_radios.attr,
        NULL
};

static const struct attribute_group fujitsu_pf_attribute_group = {
        .attrs = fujitsu_pf_attributes
};

static struct platform_driver fujitsu_pf_driver = {
        .driver = {
                   .name = "fujitsu-laptop",
                   }
};

/* ACPI device for LCD brightness control */

static const struct key_entry keymap_backlight[] = {
        { KE_KEY, true, { KEY_BRIGHTNESSUP } },
        { KE_KEY, false, { KEY_BRIGHTNESSDOWN } },
        { KE_END, 0 }
};

static int acpi_fujitsu_bl_input_setup(struct acpi_device *device)
{
        struct fujitsu_bl *priv = acpi_driver_data(device);
        int ret;

        priv->input = devm_input_allocate_device(&device->dev);
        if (!priv->input)
                return -ENOMEM;

        snprintf(priv->phys, sizeof(priv->phys), "%s/video/input0",
                 acpi_device_hid(device));

        priv->input->name = acpi_device_name(device);
        priv->input->phys = priv->phys;
        priv->input->id.bustype = BUS_HOST;
        priv->input->id.product = 0x06;

        ret = sparse_keymap_setup(priv->input, keymap_backlight, NULL);
        if (ret)
                return ret;

        return input_register_device(priv->input);
}

static int fujitsu_backlight_register(struct acpi_device *device)
{
        struct fujitsu_bl *priv = acpi_driver_data(device);
        const struct backlight_properties props = {
                .brightness = priv->brightness_level,
                .max_brightness = priv->max_brightness - 1,
                .type = BACKLIGHT_PLATFORM
        };
        struct backlight_device *bd;

        bd = devm_backlight_device_register(&device->dev, "fujitsu-laptop",
                                            &device->dev, device,
                                            &fujitsu_bl_ops, &props);
        if (IS_ERR(bd))
                return PTR_ERR(bd);

        priv->bl_device = bd;

        return 0;
}

static int acpi_fujitsu_bl_add(struct acpi_device *device)
{
        struct fujitsu_bl *priv;
        int ret;

        if (acpi_video_get_backlight_type() != acpi_backlight_vendor)
                return -ENODEV;

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

        fujitsu_bl = priv;
        strcpy(acpi_device_name(device), ACPI_FUJITSU_BL_DEVICE_NAME);
        strcpy(acpi_device_class(device), ACPI_FUJITSU_CLASS);
        device->driver_data = priv;

        pr_info("ACPI: %s [%s]\n",
                acpi_device_name(device), acpi_device_bid(device));

        if (get_max_brightness(device) <= 0)
                priv->max_brightness = FUJITSU_LCD_N_LEVELS;
        get_lcd_level(device);

        ret = acpi_fujitsu_bl_input_setup(device);
        if (ret)
                return ret;

        return fujitsu_backlight_register(device);
}

/* Brightness notify */

static void acpi_fujitsu_bl_notify(struct acpi_device *device, u32 event)
{
        struct fujitsu_bl *priv = acpi_driver_data(device);
        int oldb, newb;

        if (event != ACPI_FUJITSU_NOTIFY_CODE) {
                acpi_handle_info(device->handle, "unsupported event [0x%x]\n",
                                 event);
                sparse_keymap_report_event(priv->input, -1, 1, true);
                return;
        }

        oldb = priv->brightness_level;
        get_lcd_level(device);
        newb = priv->brightness_level;

        acpi_handle_debug(device->handle,
                          "brightness button event [%i -> %i]\n", oldb, newb);

        if (oldb == newb)
                return;

        if (!disable_brightness_adjust)
                set_lcd_level(device, newb);

        sparse_keymap_report_event(priv->input, oldb < newb, 1, true);
}

/* ACPI device for hotkey handling */

static const struct key_entry keymap_default[] = {
        { KE_KEY, KEY1_CODE,            { KEY_PROG1 } },
        { KE_KEY, KEY2_CODE,            { KEY_PROG2 } },
        { KE_KEY, KEY3_CODE,            { KEY_PROG3 } },
        { KE_KEY, KEY4_CODE,            { KEY_PROG4 } },
        { KE_KEY, KEY5_CODE,            { KEY_RFKILL } },
        /* Soft keys read from status flags */
        { KE_KEY, FLAG_RFKILL,          { KEY_RFKILL } },
        { KE_KEY, FLAG_TOUCHPAD_TOGGLE, { KEY_TOUCHPAD_TOGGLE } },
        { KE_KEY, FLAG_MICMUTE,         { KEY_MICMUTE } },
        { KE_END, 0 }
};

static const struct key_entry keymap_s64x0[] = {
        { KE_KEY, KEY1_CODE, { KEY_SCREENLOCK } },      /* "Lock" */
        { KE_KEY, KEY2_CODE, { KEY_HELP } },            /* "Mobility Center */
        { KE_KEY, KEY3_CODE, { KEY_PROG3 } },
        { KE_KEY, KEY4_CODE, { KEY_PROG4 } },
        { KE_END, 0 }
};

static const struct key_entry keymap_p8010[] = {
        { KE_KEY, KEY1_CODE, { KEY_HELP } },            /* "Support" */
        { KE_KEY, KEY2_CODE, { KEY_PROG2 } },
        { KE_KEY, KEY3_CODE, { KEY_SWITCHVIDEOMODE } }, /* "Presentation" */
        { KE_KEY, KEY4_CODE, { KEY_WWW } },             /* "WWW" */
        { KE_END, 0 }
};

static const struct key_entry *keymap = keymap_default;

static int fujitsu_laptop_dmi_keymap_override(const struct dmi_system_id *id)
{
        pr_info("Identified laptop model '%s'\n", id->ident);
        keymap = id->driver_data;
        return 1;
}

static const struct dmi_system_id fujitsu_laptop_dmi_table[] = {
        {
                .callback = fujitsu_laptop_dmi_keymap_override,
                .ident = "Fujitsu Siemens S6410",
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
                        DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK S6410"),
                },
                .driver_data = (void *)keymap_s64x0
        },
        {
                .callback = fujitsu_laptop_dmi_keymap_override,
                .ident = "Fujitsu Siemens S6420",
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
                        DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK S6420"),
                },
                .driver_data = (void *)keymap_s64x0
        },
        {
                .callback = fujitsu_laptop_dmi_keymap_override,
                .ident = "Fujitsu LifeBook P8010",
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
                        DMI_MATCH(DMI_PRODUCT_NAME, "LifeBook P8010"),
                },
                .driver_data = (void *)keymap_p8010
        },
        {}
};

static int acpi_fujitsu_laptop_input_setup(struct acpi_device *device)
{
        struct fujitsu_laptop *priv = acpi_driver_data(device);
        int ret;

        priv->input = devm_input_allocate_device(&device->dev);
        if (!priv->input)
                return -ENOMEM;

        snprintf(priv->phys, sizeof(priv->phys), "%s/input0",
                 acpi_device_hid(device));

        priv->input->name = acpi_device_name(device);
        priv->input->phys = priv->phys;
        priv->input->id.bustype = BUS_HOST;

        dmi_check_system(fujitsu_laptop_dmi_table);
        ret = sparse_keymap_setup(priv->input, keymap, NULL);
        if (ret)
                return ret;

        return input_register_device(priv->input);
}

static int fujitsu_laptop_platform_add(struct acpi_device *device)
{
        struct fujitsu_laptop *priv = acpi_driver_data(device);
        int ret;

        priv->pf_device = platform_device_alloc("fujitsu-laptop", -1);
        if (!priv->pf_device)
                return -ENOMEM;

        platform_set_drvdata(priv->pf_device, priv);

        ret = platform_device_add(priv->pf_device);
        if (ret)
                goto err_put_platform_device;

        ret = sysfs_create_group(&priv->pf_device->dev.kobj,
                                 &fujitsu_pf_attribute_group);
        if (ret)
                goto err_del_platform_device;

        return 0;

err_del_platform_device:
        platform_device_del(priv->pf_device);
err_put_platform_device:
        platform_device_put(priv->pf_device);

        return ret;
}

static void fujitsu_laptop_platform_remove(struct acpi_device *device)
{
        struct fujitsu_laptop *priv = acpi_driver_data(device);

        sysfs_remove_group(&priv->pf_device->dev.kobj,
                           &fujitsu_pf_attribute_group);
        platform_device_unregister(priv->pf_device);
}

static int logolamp_set(struct led_classdev *cdev,
                        enum led_brightness brightness)
{
        struct acpi_device *device = to_acpi_device(cdev->dev->parent);
        int poweron = FUNC_LED_ON, always = FUNC_LED_ON;
        int ret;

        if (brightness < LED_HALF)
                poweron = FUNC_LED_OFF;

        if (brightness < LED_FULL)
                always = FUNC_LED_OFF;

        ret = call_fext_func(device, FUNC_LEDS, 0x1, LOGOLAMP_POWERON, poweron);
        if (ret < 0)
                return ret;

        return call_fext_func(device, FUNC_LEDS, 0x1, LOGOLAMP_ALWAYS, always);
}

static enum led_brightness logolamp_get(struct led_classdev *cdev)
{
        struct acpi_device *device = to_acpi_device(cdev->dev->parent);
        int ret;

        ret = call_fext_func(device, FUNC_LEDS, 0x2, LOGOLAMP_ALWAYS, 0x0);
        if (ret == FUNC_LED_ON)
                return LED_FULL;

        ret = call_fext_func(device, FUNC_LEDS, 0x2, LOGOLAMP_POWERON, 0x0);
        if (ret == FUNC_LED_ON)
                return LED_HALF;

        return LED_OFF;
}

static int kblamps_set(struct led_classdev *cdev,
                       enum led_brightness brightness)
{
        struct acpi_device *device = to_acpi_device(cdev->dev->parent);

        if (brightness >= LED_FULL)
                return call_fext_func(device, FUNC_LEDS, 0x1, KEYBOARD_LAMPS,
                                      FUNC_LED_ON);
        else
                return call_fext_func(device, FUNC_LEDS, 0x1, KEYBOARD_LAMPS,
                                      FUNC_LED_OFF);
}

static enum led_brightness kblamps_get(struct led_classdev *cdev)
{
        struct acpi_device *device = to_acpi_device(cdev->dev->parent);
        enum led_brightness brightness = LED_OFF;

        if (call_fext_func(device,
                           FUNC_LEDS, 0x2, KEYBOARD_LAMPS, 0x0) == FUNC_LED_ON)
                brightness = LED_FULL;

        return brightness;
}

static int radio_led_set(struct led_classdev *cdev,
                         enum led_brightness brightness)
{
        struct acpi_device *device = to_acpi_device(cdev->dev->parent);

        if (brightness >= LED_FULL)
                return call_fext_func(device, FUNC_FLAGS, 0x5, RADIO_LED_ON,
                                      RADIO_LED_ON);
        else
                return call_fext_func(device, FUNC_FLAGS, 0x5, RADIO_LED_ON,
                                      0x0);
}

static enum led_brightness radio_led_get(struct led_classdev *cdev)
{
        struct acpi_device *device = to_acpi_device(cdev->dev->parent);
        enum led_brightness brightness = LED_OFF;

        if (call_fext_func(device, FUNC_FLAGS, 0x4, 0x0, 0x0) & RADIO_LED_ON)
                brightness = LED_FULL;

        return brightness;
}

static int eco_led_set(struct led_classdev *cdev,
                       enum led_brightness brightness)
{
        struct acpi_device *device = to_acpi_device(cdev->dev->parent);
        int curr;

        curr = call_fext_func(device, FUNC_LEDS, 0x2, ECO_LED, 0x0);
        if (brightness >= LED_FULL)
                return call_fext_func(device, FUNC_LEDS, 0x1, ECO_LED,
                                      curr | ECO_LED_ON);
        else
                return call_fext_func(device, FUNC_LEDS, 0x1, ECO_LED,
                                      curr & ~ECO_LED_ON);
}

static enum led_brightness eco_led_get(struct led_classdev *cdev)
{
        struct acpi_device *device = to_acpi_device(cdev->dev->parent);
        enum led_brightness brightness = LED_OFF;

        if (call_fext_func(device, FUNC_LEDS, 0x2, ECO_LED, 0x0) & ECO_LED_ON)
                brightness = LED_FULL;

        return brightness;
}

static int acpi_fujitsu_laptop_leds_register(struct acpi_device *device)
{
        struct fujitsu_laptop *priv = acpi_driver_data(device);
        struct led_classdev *led;
        int ret;

        if (call_fext_func(device,
                           FUNC_LEDS, 0x0, 0x0, 0x0) & LOGOLAMP_POWERON) {
                led = devm_kzalloc(&device->dev, sizeof(*led), GFP_KERNEL);
                if (!led)
                        return -ENOMEM;

                led->name = "fujitsu::logolamp";
                led->brightness_set_blocking = logolamp_set;
                led->brightness_get = logolamp_get;
                ret = devm_led_classdev_register(&device->dev, led);
                if (ret)
                        return ret;
        }

        if ((call_fext_func(device,
                            FUNC_LEDS, 0x0, 0x0, 0x0) & KEYBOARD_LAMPS) &&
            (call_fext_func(device, FUNC_BUTTONS, 0x0, 0x0, 0x0) == 0x0)) {
                led = devm_kzalloc(&device->dev, sizeof(*led), GFP_KERNEL);
                if (!led)
                        return -ENOMEM;

                led->name = "fujitsu::kblamps";
                led->brightness_set_blocking = kblamps_set;
                led->brightness_get = kblamps_get;
                ret = devm_led_classdev_register(&device->dev, led);
                if (ret)
                        return ret;
        }

        /*
         * Some Fujitsu laptops have a radio toggle button in place of a slide
         * switch and all such machines appear to also have an RF LED.  Based on
         * comparing DSDT tables of four Fujitsu Lifebook models (E744, E751,
         * S7110, S8420; the first one has a radio toggle button, the other
         * three have slide switches), bit 17 of flags_supported (the value
         * returned by method S000 of ACPI device FUJ02E3) seems to indicate
         * whether given model has a radio toggle button.
         */
        if (priv->flags_supported & BIT(17)) {
                led = devm_kzalloc(&device->dev, sizeof(*led), GFP_KERNEL);
                if (!led)
                        return -ENOMEM;

                led->name = "fujitsu::radio_led";
                led->brightness_set_blocking = radio_led_set;
                led->brightness_get = radio_led_get;
                led->default_trigger = "rfkill-any";
                ret = devm_led_classdev_register(&device->dev, led);
                if (ret)
                        return ret;
        }

        /* Support for eco led is not always signaled in bit corresponding
         * to the bit used to control the led. According to the DSDT table,
         * bit 14 seems to indicate presence of said led as well.
         * Confirm by testing the status.
         */
        if ((call_fext_func(device, FUNC_LEDS, 0x0, 0x0, 0x0) & BIT(14)) &&
            (call_fext_func(device,
                            FUNC_LEDS, 0x2, ECO_LED, 0x0) != UNSUPPORTED_CMD)) {
                led = devm_kzalloc(&device->dev, sizeof(*led), GFP_KERNEL);
                if (!led)
                        return -ENOMEM;

                led->name = "fujitsu::eco_led";
                led->brightness_set_blocking = eco_led_set;
                led->brightness_get = eco_led_get;
                ret = devm_led_classdev_register(&device->dev, led);
                if (ret)
                        return ret;
        }

        return 0;
}

static int acpi_fujitsu_laptop_add(struct acpi_device *device)
{
        struct fujitsu_laptop *priv;
        int ret, i = 0;

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

        WARN_ONCE(fext, "More than one FUJ02E3 ACPI device was found.  Driver may not work as intended.");
        fext = device;

        strcpy(acpi_device_name(device), ACPI_FUJITSU_LAPTOP_DEVICE_NAME);
        strcpy(acpi_device_class(device), ACPI_FUJITSU_CLASS);
        device->driver_data = priv;

        /* kfifo */
        spin_lock_init(&priv->fifo_lock);
        ret = kfifo_alloc(&priv->fifo, RINGBUFFERSIZE * sizeof(int),
                          GFP_KERNEL);
        if (ret)
                return ret;

        pr_info("ACPI: %s [%s]\n",
                acpi_device_name(device), acpi_device_bid(device));

        while (call_fext_func(device, FUNC_BUTTONS, 0x1, 0x0, 0x0) != 0 &&
               i++ < MAX_HOTKEY_RINGBUFFER_SIZE)
                ; /* No action, result is discarded */
        acpi_handle_debug(device->handle, "Discarded %i ringbuffer entries\n",
                          i);

        priv->flags_supported = call_fext_func(device, FUNC_FLAGS, 0x0, 0x0,
                                               0x0);

        /* Make sure our bitmask of supported functions is cleared if the
           RFKILL function block is not implemented, like on the S7020. */
        if (priv->flags_supported == UNSUPPORTED_CMD)
                priv->flags_supported = 0;

        if (priv->flags_supported)
                priv->flags_state = call_fext_func(device, FUNC_FLAGS, 0x4, 0x0,
                                                   0x0);

        /* Suspect this is a keymap of the application panel, print it */
        acpi_handle_info(device->handle, "BTNI: [0x%x]\n",
                         call_fext_func(device, FUNC_BUTTONS, 0x0, 0x0, 0x0));

        /* Sync backlight power status */
        if (fujitsu_bl && fujitsu_bl->bl_device &&
            acpi_video_get_backlight_type() == acpi_backlight_vendor) {
                if (call_fext_func(fext, FUNC_BACKLIGHT, 0x2,
                                   BACKLIGHT_PARAM_POWER, 0x0) == BACKLIGHT_OFF)
                        fujitsu_bl->bl_device->props.power = FB_BLANK_POWERDOWN;
                else
                        fujitsu_bl->bl_device->props.power = FB_BLANK_UNBLANK;
        }

        ret = acpi_fujitsu_laptop_input_setup(device);
        if (ret)
                goto err_free_fifo;

        ret = acpi_fujitsu_laptop_leds_register(device);
        if (ret)
                goto err_free_fifo;

        ret = fujitsu_laptop_platform_add(device);
        if (ret)
                goto err_free_fifo;

        return 0;

err_free_fifo:
        kfifo_free(&priv->fifo);

        return ret;
}

static int acpi_fujitsu_laptop_remove(struct acpi_device *device)
{
        struct fujitsu_laptop *priv = acpi_driver_data(device);

        fujitsu_laptop_platform_remove(device);

        kfifo_free(&priv->fifo);

        return 0;
}

static void acpi_fujitsu_laptop_press(struct acpi_device *device, int scancode)
{
        struct fujitsu_laptop *priv = acpi_driver_data(device);
        int ret;

        ret = kfifo_in_locked(&priv->fifo, (unsigned char *)&scancode,
                              sizeof(scancode), &priv->fifo_lock);
        if (ret != sizeof(scancode)) {
                dev_info(&priv->input->dev, "Could not push scancode [0x%x]\n",
                         scancode);
                return;
        }
        sparse_keymap_report_event(priv->input, scancode, 1, false);
        dev_dbg(&priv->input->dev, "Push scancode into ringbuffer [0x%x]\n",
                scancode);
}

static void acpi_fujitsu_laptop_release(struct acpi_device *device)
{
        struct fujitsu_laptop *priv = acpi_driver_data(device);
        int scancode, ret;

        while (true) {
                ret = kfifo_out_locked(&priv->fifo, (unsigned char *)&scancode,
                                       sizeof(scancode), &priv->fifo_lock);
                if (ret != sizeof(scancode))
                        return;
                sparse_keymap_report_event(priv->input, scancode, 0, false);
                dev_dbg(&priv->input->dev,
                        "Pop scancode from ringbuffer [0x%x]\n", scancode);
        }
}

static void acpi_fujitsu_laptop_notify(struct acpi_device *device, u32 event)
{
        struct fujitsu_laptop *priv = acpi_driver_data(device);
        unsigned long flags;
        int scancode, i = 0;
        unsigned int irb;

        if (event != ACPI_FUJITSU_NOTIFY_CODE) {
                acpi_handle_info(device->handle, "Unsupported event [0x%x]\n",
                                 event);
                sparse_keymap_report_event(priv->input, -1, 1, true);
                return;
        }

        if (priv->flags_supported)
                priv->flags_state = call_fext_func(device, FUNC_FLAGS, 0x4, 0x0,
                                                   0x0);

        while ((irb = call_fext_func(device,
                                     FUNC_BUTTONS, 0x1, 0x0, 0x0)) != 0 &&
               i++ < MAX_HOTKEY_RINGBUFFER_SIZE) {
                scancode = irb & 0x4ff;
                if (sparse_keymap_entry_from_scancode(priv->input, scancode))
                        acpi_fujitsu_laptop_press(device, scancode);
                else if (scancode == 0)
                        acpi_fujitsu_laptop_release(device);
                else
                        acpi_handle_info(device->handle,
                                         "Unknown GIRB result [%x]\n", irb);
        }

        /*
         * First seen on the Skylake-based Lifebook E736/E746/E756), the
         * touchpad toggle hotkey (Fn+F4) is handled in software. Other models
         * have since added additional "soft keys". These are reported in the
         * status flags queried using FUNC_FLAGS.
         */
        if (priv->flags_supported & (FLAG_SOFTKEYS)) {
                flags = call_fext_func(device, FUNC_FLAGS, 0x1, 0x0, 0x0);
                flags &= (FLAG_SOFTKEYS);
                for_each_set_bit(i, &flags, BITS_PER_LONG)
                        sparse_keymap_report_event(priv->input, BIT(i), 1, true);
        }
}

/* Initialization */

static const struct acpi_device_id fujitsu_bl_device_ids[] = {
        {ACPI_FUJITSU_BL_HID, 0},
        {"", 0},
};

static struct acpi_driver acpi_fujitsu_bl_driver = {
        .name = ACPI_FUJITSU_BL_DRIVER_NAME,
        .class = ACPI_FUJITSU_CLASS,
        .ids = fujitsu_bl_device_ids,
        .ops = {
                .add = acpi_fujitsu_bl_add,
                .notify = acpi_fujitsu_bl_notify,
                },
};

static const struct acpi_device_id fujitsu_laptop_device_ids[] = {
        {ACPI_FUJITSU_LAPTOP_HID, 0},
        {"", 0},
};

static struct acpi_driver acpi_fujitsu_laptop_driver = {
        .name = ACPI_FUJITSU_LAPTOP_DRIVER_NAME,
        .class = ACPI_FUJITSU_CLASS,
        .ids = fujitsu_laptop_device_ids,
        .ops = {
                .add = acpi_fujitsu_laptop_add,
                .remove = acpi_fujitsu_laptop_remove,
                .notify = acpi_fujitsu_laptop_notify,
                },
};

static const struct acpi_device_id fujitsu_ids[] __used = {
        {ACPI_FUJITSU_BL_HID, 0},
        {ACPI_FUJITSU_LAPTOP_HID, 0},
        {"", 0}
};
MODULE_DEVICE_TABLE(acpi, fujitsu_ids);

static int __init fujitsu_init(void)
{
        int ret;

        ret = acpi_bus_register_driver(&acpi_fujitsu_bl_driver);
        if (ret)
                return ret;

        /* Register platform stuff */

        ret = platform_driver_register(&fujitsu_pf_driver);
        if (ret)
                goto err_unregister_acpi;

        /* Register laptop driver */

        ret = acpi_bus_register_driver(&acpi_fujitsu_laptop_driver);
        if (ret)
                goto err_unregister_platform_driver;

        pr_info("driver " FUJITSU_DRIVER_VERSION " successfully loaded\n");

        return 0;

err_unregister_platform_driver:
        platform_driver_unregister(&fujitsu_pf_driver);
err_unregister_acpi:
        acpi_bus_unregister_driver(&acpi_fujitsu_bl_driver);

        return ret;
}

static void __exit fujitsu_cleanup(void)
{
        acpi_bus_unregister_driver(&acpi_fujitsu_laptop_driver);

        platform_driver_unregister(&fujitsu_pf_driver);

        acpi_bus_unregister_driver(&acpi_fujitsu_bl_driver);

        pr_info("driver unloaded\n");
}

module_init(fujitsu_init);
module_exit(fujitsu_cleanup);

module_param(use_alt_lcd_levels, int, 0644);
MODULE_PARM_DESC(use_alt_lcd_levels, "Interface used for setting LCD brightness level (-1 = auto, 0 = force SBLL, 1 = force SBL2)");
module_param(disable_brightness_adjust, bool, 0644);
MODULE_PARM_DESC(disable_brightness_adjust, "Disable LCD brightness adjustment");

MODULE_AUTHOR("Jonathan Woithe, Peter Gruber, Tony Vroon");
MODULE_DESCRIPTION("Fujitsu laptop extras support");
MODULE_VERSION(FUJITSU_DRIVER_VERSION);
MODULE_LICENSE("GPL");