hp-wmi.c

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/*
 * HP WMI hotkeys
 *
 * Copyright (C) 2008 Red Hat <[email protected]>
 * Copyright (C) 2010, 2011 Anssi Hannula <[email protected]>
 *
 * Portions based on wistron_btns.c:
 * Copyright (C) 2005 Miloslav Trmac <[email protected]>
 * Copyright (C) 2005 Bernhard Rosenkraenzer <[email protected]>
 * Copyright (C) 2005 Dmitry Torokhov <[email protected]>
 *
 *  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/slab.h>
#include <linux/types.h>
#include <linux/input.h>
#include <linux/input/sparse-keymap.h>
#include <linux/platform_device.h>
#include <linux/acpi.h>
#include <linux/rfkill.h>
#include <linux/string.h>

MODULE_AUTHOR("Matthew Garrett <[email protected]>");
MODULE_DESCRIPTION("HP laptop WMI hotkeys driver");
MODULE_LICENSE("GPL");

MODULE_ALIAS("wmi:95F24279-4D7B-4334-9387-ACCDC67EF61C");
MODULE_ALIAS("wmi:5FB7F034-2C63-45e9-BE91-3D44E2C707E4");

#define HPWMI_EVENT_GUID "95F24279-4D7B-4334-9387-ACCDC67EF61C"
#define HPWMI_BIOS_GUID "5FB7F034-2C63-45e9-BE91-3D44E2C707E4"

#define HPWMI_DISPLAY_QUERY 0x1
#define HPWMI_HDDTEMP_QUERY 0x2
#define HPWMI_ALS_QUERY 0x3
#define HPWMI_HARDWARE_QUERY 0x4
#define HPWMI_WIRELESS_QUERY 0x5
#define HPWMI_HOTKEY_QUERY 0xc
#define HPWMI_WIRELESS2_QUERY 0x1b

enum hp_wmi_radio {
    HPWMI_WIFI = 0,
    HPWMI_BLUETOOTH = 1,
    HPWMI_WWAN = 2,
};

enum hp_wmi_event_ids {
    HPWMI_DOCK_EVENT = 1,
    HPWMI_PARK_HDD = 2,
    HPWMI_SMART_ADAPTER = 3,
    HPWMI_BEZEL_BUTTON = 4,
    HPWMI_WIRELESS = 5,
    HPWMI_CPU_BATTERY_THROTTLE = 6,
    HPWMI_LOCK_SWITCH = 7,
};

static int __devinit hp_wmi_bios_setup(struct platform_device *device);
static int __exit hp_wmi_bios_remove(struct platform_device *device);
static int hp_wmi_resume_handler(struct device *device);

struct bios_args {
    u32 signature;
    u32 command;
    u32 commandtype;
    u32 datasize;
    u32 data;
};

struct bios_return {
    u32 sigpass;
    u32 return_code;
};

enum hp_return_value {
    HPWMI_RET_WRONG_SIGNATURE   = 0x02,
    HPWMI_RET_UNKNOWN_COMMAND   = 0x03,
    HPWMI_RET_UNKNOWN_CMDTYPE   = 0x04,
    HPWMI_RET_INVALID_PARAMETERS    = 0x05,
};

enum hp_wireless2_bits {
    HPWMI_POWER_STATE   = 0x01,
    HPWMI_POWER_SOFT    = 0x02,
    HPWMI_POWER_BIOS    = 0x04,
    HPWMI_POWER_HARD    = 0x08,
};

#define IS_HWBLOCKED(x) ((x & (HPWMI_POWER_BIOS | HPWMI_POWER_HARD)) \
             != (HPWMI_POWER_BIOS | HPWMI_POWER_HARD))
#define IS_SWBLOCKED(x) !(x & HPWMI_POWER_SOFT)

struct bios_rfkill2_device_state {
    u8 radio_type;
    u8 bus_type;
    u16 vendor_id;
    u16 product_id;
    u16 subsys_vendor_id;
    u16 subsys_product_id;
    u8 rfkill_id;
    u8 power;
    u8 unknown[4];
};

/* 7 devices fit into the 128 byte buffer */
#define HPWMI_MAX_RFKILL2_DEVICES   7

struct bios_rfkill2_state {
    u8 unknown[7];
    u8 count;
    u8 pad[8];
    struct bios_rfkill2_device_state device[HPWMI_MAX_RFKILL2_DEVICES];
};

static const struct key_entry hp_wmi_keymap[] = {
    { KE_KEY, 0x02,   { KEY_BRIGHTNESSUP } },
    { KE_KEY, 0x03,   { KEY_BRIGHTNESSDOWN } },
    { KE_KEY, 0x20e6, { KEY_PROG1 } },
    { KE_KEY, 0x20e8, { KEY_MEDIA } },
    { KE_KEY, 0x2142, { KEY_MEDIA } },
    { KE_KEY, 0x213b, { KEY_INFO } },
    { KE_KEY, 0x2169, { KEY_DIRECTION } },
    { KE_KEY, 0x231b, { KEY_HELP } },
    { KE_END, 0 }
};

static struct input_dev *hp_wmi_input_dev;
static struct platform_device *hp_wmi_platform_dev;

static struct rfkill *wifi_rfkill;
static struct rfkill *bluetooth_rfkill;
static struct rfkill *wwan_rfkill;

struct rfkill2_device {
    u8 id;
    int num;
    struct rfkill *rfkill;
};

static int rfkill2_count;
static struct rfkill2_device rfkill2[HPWMI_MAX_RFKILL2_DEVICES];

static const struct dev_pm_ops hp_wmi_pm_ops = {
    .resume  = hp_wmi_resume_handler,
    .restore  = hp_wmi_resume_handler,
};

static struct platform_driver hp_wmi_driver = {
    .driver = {
        .name = "hp-wmi",
        .owner = THIS_MODULE,
        .pm = &hp_wmi_pm_ops,
    },
    .probe = hp_wmi_bios_setup,
    .remove = hp_wmi_bios_remove,
};

/*
 * hp_wmi_perform_query
 *
 * query:   The commandtype -> What should be queried
 * write:   The command -> 0 read, 1 write, 3 ODM specific
 * buffer:  Buffer used as input and/or output
 * insize:  Size of input buffer
 * outsize: Size of output buffer
 *
 * returns zero on success
 *         an HP WMI query specific error code (which is positive)
 *         -EINVAL if the query was not successful at all
 *         -EINVAL if the output buffer size exceeds buffersize
 *
 * Note: The buffersize must at least be the maximum of the input and output
 *       size. E.g. Battery info query (0x7) is defined to have 1 byte input
 *       and 128 byte output. The caller would do:
 *       buffer = kzalloc(128, GFP_KERNEL);
 *       ret = hp_wmi_perform_query(0x7, 0, buffer, 1, 128)
 */
static int hp_wmi_perform_query(int query, int write, void *buffer,
                int insize, int outsize)
{
    struct bios_return *bios_return;
    int actual_outsize;
    union acpi_object *obj;
    struct bios_args args = {
        .signature = 0x55434553,
        .command = write ? 0x2 : 0x1,
        .commandtype = query,
        .datasize = insize,
        .data = 0,
    };
    struct acpi_buffer input = { sizeof(struct bios_args), &args };
    struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
    u32 rc;

    if (WARN_ON(insize > sizeof(args.data)))
        return -EINVAL;
    memcpy(&args.data, buffer, insize);

    wmi_evaluate_method(HPWMI_BIOS_GUID, 0, 0x3, &input, &output);

    obj = output.pointer;

    if (!obj)
        return -EINVAL;
    else if (obj->type != ACPI_TYPE_BUFFER) {
        kfree(obj);
        return -EINVAL;
    }

    bios_return = (struct bios_return *)obj->buffer.pointer;
    rc = bios_return->return_code;

    if (rc) {
        if (rc != HPWMI_RET_UNKNOWN_CMDTYPE)
            pr_warn("query 0x%x returned error 0x%x\n", query, rc);
        kfree(obj);
        return rc;
    }

    if (!outsize) {
        /* ignore output data */
        kfree(obj);
        return 0;
    }

    actual_outsize = min(outsize, (int)(obj->buffer.length - sizeof(*bios_return)));
    memcpy(buffer, obj->buffer.pointer + sizeof(*bios_return), actual_outsize);
    memset(buffer + actual_outsize, 0, outsize - actual_outsize);
    kfree(obj);
    return 0;
}

static int hp_wmi_display_state(void)
{
    int state = 0;
    int ret = hp_wmi_perform_query(HPWMI_DISPLAY_QUERY, 0, &state,
                       sizeof(state), sizeof(state));
    if (ret)
        return -EINVAL;
    return state;
}

static int hp_wmi_hddtemp_state(void)
{
    int state = 0;
    int ret = hp_wmi_perform_query(HPWMI_HDDTEMP_QUERY, 0, &state,
                       sizeof(state), sizeof(state));
    if (ret)
        return -EINVAL;
    return state;
}

static int hp_wmi_als_state(void)
{
    int state = 0;
    int ret = hp_wmi_perform_query(HPWMI_ALS_QUERY, 0, &state,
                       sizeof(state), sizeof(state));
    if (ret)
        return -EINVAL;
    return state;
}

static int hp_wmi_dock_state(void)
{
    int state = 0;
    int ret = hp_wmi_perform_query(HPWMI_HARDWARE_QUERY, 0, &state,
                       sizeof(state), sizeof(state));

    if (ret)
        return -EINVAL;

    return state & 0x1;
}

static int hp_wmi_tablet_state(void)
{
    int state = 0;
    int ret = hp_wmi_perform_query(HPWMI_HARDWARE_QUERY, 0, &state,
                       sizeof(state), sizeof(state));
    if (ret)
        return ret;

    return (state & 0x4) ? 1 : 0;
}

static int hp_wmi_set_block(void *data, bool blocked)
{
    enum hp_wmi_radio r = (enum hp_wmi_radio) data;
    int query = BIT(r + 8) | ((!blocked) << r);
    int ret;

    ret = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 1,
                   &query, sizeof(query), 0);
    if (ret)
        return -EINVAL;
    return 0;
}

static const struct rfkill_ops hp_wmi_rfkill_ops = {
    .set_block = hp_wmi_set_block,
};

static bool hp_wmi_get_sw_state(enum hp_wmi_radio r)
{
    int wireless = 0;
    int mask;
    hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0,
                 &wireless, sizeof(wireless),
                 sizeof(wireless));
    /* TBD: Pass error */

    mask = 0x200 << (r * 8);

    if (wireless & mask)
        return false;
    else
        return true;
}

static bool hp_wmi_get_hw_state(enum hp_wmi_radio r)
{
    int wireless = 0;
    int mask;
    hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0,
                 &wireless, sizeof(wireless),
                 sizeof(wireless));
    /* TBD: Pass error */

    mask = 0x800 << (r * 8);

    if (wireless & mask)
        return false;
    else
        return true;
}

static int hp_wmi_rfkill2_set_block(void *data, bool blocked)
{
    int rfkill_id = (int)(long)data;
    char buffer[4] = { 0x01, 0x00, rfkill_id, !blocked };

    if (hp_wmi_perform_query(HPWMI_WIRELESS2_QUERY, 1,
                   buffer, sizeof(buffer), 0))
        return -EINVAL;
    return 0;
}

static const struct rfkill_ops hp_wmi_rfkill2_ops = {
    .set_block = hp_wmi_rfkill2_set_block,
};

static int hp_wmi_rfkill2_refresh(void)
{
    int err, i;
    struct bios_rfkill2_state state;

    err = hp_wmi_perform_query(HPWMI_WIRELESS2_QUERY, 0, &state,
                   0, sizeof(state));
    if (err)
        return err;

    for (i = 0; i < rfkill2_count; i++) {
        int num = rfkill2[i].num;
        struct bios_rfkill2_device_state *devstate;
        devstate = &state.device[num];

        if (num >= state.count ||
            devstate->rfkill_id != rfkill2[i].id) {
            pr_warn("power configuration of the wireless devices unexpectedly changed\n");
            continue;
        }

        rfkill_set_states(rfkill2[i].rfkill,
                  IS_SWBLOCKED(devstate->power),
                  IS_HWBLOCKED(devstate->power));
    }

    return 0;
}

static ssize_t show_display(struct device *dev, struct device_attribute *attr,
                char *buf)
{
    int value = hp_wmi_display_state();
    if (value < 0)
        return -EINVAL;
    return sprintf(buf, "%d\n", value);
}

static ssize_t show_hddtemp(struct device *dev, struct device_attribute *attr,
                char *buf)
{
    int value = hp_wmi_hddtemp_state();
    if (value < 0)
        return -EINVAL;
    return sprintf(buf, "%d\n", value);
}

static ssize_t show_als(struct device *dev, struct device_attribute *attr,
            char *buf)
{
    int value = hp_wmi_als_state();
    if (value < 0)
        return -EINVAL;
    return sprintf(buf, "%d\n", value);
}

static ssize_t show_dock(struct device *dev, struct device_attribute *attr,
             char *buf)
{
    int value = hp_wmi_dock_state();
    if (value < 0)
        return -EINVAL;
    return sprintf(buf, "%d\n", value);
}

static ssize_t show_tablet(struct device *dev, struct device_attribute *attr,
             char *buf)
{
    int value = hp_wmi_tablet_state();
    if (value < 0)
        return -EINVAL;
    return sprintf(buf, "%d\n", value);
}

static ssize_t set_als(struct device *dev, struct device_attribute *attr,
               const char *buf, size_t count)
{
    u32 tmp = simple_strtoul(buf, NULL, 10);
    int ret = hp_wmi_perform_query(HPWMI_ALS_QUERY, 1, &tmp,
                       sizeof(tmp), sizeof(tmp));
    if (ret)
        return -EINVAL;

    return count;
}

static DEVICE_ATTR(display, S_IRUGO, show_display, NULL);
static DEVICE_ATTR(hddtemp, S_IRUGO, show_hddtemp, NULL);
static DEVICE_ATTR(als, S_IRUGO | S_IWUSR, show_als, set_als);
static DEVICE_ATTR(dock, S_IRUGO, show_dock, NULL);
static DEVICE_ATTR(tablet, S_IRUGO, show_tablet, NULL);

static void hp_wmi_notify(u32 value, void *context)
{
    struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
    union acpi_object *obj;
    u32 event_id, event_data;
    int key_code = 0, ret;
    u32 *location;
    acpi_status status;

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

    obj = (union acpi_object *)response.pointer;

    if (!obj)
        return;
    if (obj->type != ACPI_TYPE_BUFFER) {
        pr_info("Unknown response received %d\n", obj->type);
        kfree(obj);
        return;
    }

    /*
     * Depending on ACPI version the concatenation of id and event data
     * inside _WED function will result in a 8 or 16 byte buffer.
     */
    location = (u32 *)obj->buffer.pointer;
    if (obj->buffer.length == 8) {
        event_id = *location;
        event_data = *(location + 1);
    } else if (obj->buffer.length == 16) {
        event_id = *location;
        event_data = *(location + 2);
    } else {
        pr_info("Unknown buffer length %d\n", obj->buffer.length);
        kfree(obj);
        return;
    }
    kfree(obj);

    switch (event_id) {
    case HPWMI_DOCK_EVENT:
        input_report_switch(hp_wmi_input_dev, SW_DOCK,
                    hp_wmi_dock_state());
        input_report_switch(hp_wmi_input_dev, SW_TABLET_MODE,
                    hp_wmi_tablet_state());
        input_sync(hp_wmi_input_dev);
        break;
    case HPWMI_PARK_HDD:
        break;
    case HPWMI_SMART_ADAPTER:
        break;
    case HPWMI_BEZEL_BUTTON:
        ret = hp_wmi_perform_query(HPWMI_HOTKEY_QUERY, 0,
                       &key_code,
                       sizeof(key_code),
                       sizeof(key_code));
        if (ret)
            break;

        if (!sparse_keymap_report_event(hp_wmi_input_dev,
                        key_code, 1, true))
            pr_info("Unknown key code - 0x%x\n", key_code);
        break;
    case HPWMI_WIRELESS:
        if (rfkill2_count) {
            hp_wmi_rfkill2_refresh();
            break;
        }

        if (wifi_rfkill)
            rfkill_set_states(wifi_rfkill,
                      hp_wmi_get_sw_state(HPWMI_WIFI),
                      hp_wmi_get_hw_state(HPWMI_WIFI));
        if (bluetooth_rfkill)
            rfkill_set_states(bluetooth_rfkill,
                      hp_wmi_get_sw_state(HPWMI_BLUETOOTH),
                      hp_wmi_get_hw_state(HPWMI_BLUETOOTH));
        if (wwan_rfkill)
            rfkill_set_states(wwan_rfkill,
                      hp_wmi_get_sw_state(HPWMI_WWAN),
                      hp_wmi_get_hw_state(HPWMI_WWAN));
        break;
    case HPWMI_CPU_BATTERY_THROTTLE:
        pr_info("Unimplemented CPU throttle because of 3 Cell battery event detected\n");
        break;
    case HPWMI_LOCK_SWITCH:
        break;
    default:
        pr_info("Unknown event_id - %d - 0x%x\n", event_id, event_data);
        break;
    }
}

static int __init hp_wmi_input_setup(void)
{
    acpi_status status;
    int err;

    hp_wmi_input_dev = input_allocate_device();
    if (!hp_wmi_input_dev)
        return -ENOMEM;

    hp_wmi_input_dev->name = "HP WMI hotkeys";
    hp_wmi_input_dev->phys = "wmi/input0";
    hp_wmi_input_dev->id.bustype = BUS_HOST;

    __set_bit(EV_SW, hp_wmi_input_dev->evbit);
    __set_bit(SW_DOCK, hp_wmi_input_dev->swbit);
    __set_bit(SW_TABLET_MODE, hp_wmi_input_dev->swbit);

    err = sparse_keymap_setup(hp_wmi_input_dev, hp_wmi_keymap, NULL);
    if (err)
        goto err_free_dev;

    /* Set initial hardware state */
    input_report_switch(hp_wmi_input_dev, SW_DOCK, hp_wmi_dock_state());
    input_report_switch(hp_wmi_input_dev, SW_TABLET_MODE,
                hp_wmi_tablet_state());
    input_sync(hp_wmi_input_dev);

    status = wmi_install_notify_handler(HPWMI_EVENT_GUID, hp_wmi_notify, NULL);
    if (ACPI_FAILURE(status)) {
        err = -EIO;
        goto err_free_keymap;
    }

    err = input_register_device(hp_wmi_input_dev);
    if (err)
        goto err_uninstall_notifier;

    return 0;

 err_uninstall_notifier:
    wmi_remove_notify_handler(HPWMI_EVENT_GUID);
 err_free_keymap:
    sparse_keymap_free(hp_wmi_input_dev);
 err_free_dev:
    input_free_device(hp_wmi_input_dev);
    return err;
}

static void hp_wmi_input_destroy(void)
{
    wmi_remove_notify_handler(HPWMI_EVENT_GUID);
    sparse_keymap_free(hp_wmi_input_dev);
    input_unregister_device(hp_wmi_input_dev);
}

static void cleanup_sysfs(struct platform_device *device)
{
    device_remove_file(&device->dev, &dev_attr_display);
    device_remove_file(&device->dev, &dev_attr_hddtemp);
    device_remove_file(&device->dev, &dev_attr_als);
    device_remove_file(&device->dev, &dev_attr_dock);
    device_remove_file(&device->dev, &dev_attr_tablet);
}

static int __devinit hp_wmi_rfkill_setup(struct platform_device *device)
{
    int err;
    int wireless = 0;

    err = hp_wmi_perform_query(HPWMI_WIRELESS_QUERY, 0, &wireless,
                   sizeof(wireless), sizeof(wireless));
    if (err)
        return err;

    if (wireless & 0x1) {
        wifi_rfkill = rfkill_alloc("hp-wifi", &device->dev,
                       RFKILL_TYPE_WLAN,
                       &hp_wmi_rfkill_ops,
                       (void *) HPWMI_WIFI);
        if (!wifi_rfkill)
            return -ENOMEM;
        rfkill_init_sw_state(wifi_rfkill,
                     hp_wmi_get_sw_state(HPWMI_WIFI));
        rfkill_set_hw_state(wifi_rfkill,
                    hp_wmi_get_hw_state(HPWMI_WIFI));
        err = rfkill_register(wifi_rfkill);
        if (err)
            goto register_wifi_error;
    }

    if (wireless & 0x2) {
        bluetooth_rfkill = rfkill_alloc("hp-bluetooth", &device->dev,
                        RFKILL_TYPE_BLUETOOTH,
                        &hp_wmi_rfkill_ops,
                        (void *) HPWMI_BLUETOOTH);
        if (!bluetooth_rfkill) {
            err = -ENOMEM;
            goto register_wifi_error;
        }
        rfkill_init_sw_state(bluetooth_rfkill,
                     hp_wmi_get_sw_state(HPWMI_BLUETOOTH));
        rfkill_set_hw_state(bluetooth_rfkill,
                    hp_wmi_get_hw_state(HPWMI_BLUETOOTH));
        err = rfkill_register(bluetooth_rfkill);
        if (err)
            goto register_bluetooth_error;
    }

    if (wireless & 0x4) {
        wwan_rfkill = rfkill_alloc("hp-wwan", &device->dev,
                       RFKILL_TYPE_WWAN,
                       &hp_wmi_rfkill_ops,
                       (void *) HPWMI_WWAN);
        if (!wwan_rfkill) {
            err = -ENOMEM;
            goto register_bluetooth_error;
        }
        rfkill_init_sw_state(wwan_rfkill,
                     hp_wmi_get_sw_state(HPWMI_WWAN));
        rfkill_set_hw_state(wwan_rfkill,
                    hp_wmi_get_hw_state(HPWMI_WWAN));
        err = rfkill_register(wwan_rfkill);
        if (err)
            goto register_wwan_err;
    }

    return 0;
register_wwan_err:
    rfkill_destroy(wwan_rfkill);
    wwan_rfkill = NULL;
    if (bluetooth_rfkill)
        rfkill_unregister(bluetooth_rfkill);
register_bluetooth_error:
    rfkill_destroy(bluetooth_rfkill);
    bluetooth_rfkill = NULL;
    if (wifi_rfkill)
        rfkill_unregister(wifi_rfkill);
register_wifi_error:
    rfkill_destroy(wifi_rfkill);
    wifi_rfkill = NULL;
    return err;
}

static int __devinit hp_wmi_rfkill2_setup(struct platform_device *device)
{
    int err, i;
    struct bios_rfkill2_state state;
    err = hp_wmi_perform_query(HPWMI_WIRELESS2_QUERY, 0, &state,
                   0, sizeof(state));
    if (err)
        return err;

    if (state.count > HPWMI_MAX_RFKILL2_DEVICES) {
        pr_warn("unable to parse 0x1b query output\n");
        return -EINVAL;
    }

    for (i = 0; i < state.count; i++) {
        struct rfkill *rfkill;
        enum rfkill_type type;
        char *name;
        switch (state.device[i].radio_type) {
        case HPWMI_WIFI:
            type = RFKILL_TYPE_WLAN;
            name = "hp-wifi";
            break;
        case HPWMI_BLUETOOTH:
            type = RFKILL_TYPE_BLUETOOTH;
            name = "hp-bluetooth";
            break;
        case HPWMI_WWAN:
            type = RFKILL_TYPE_WWAN;
            name = "hp-wwan";
            break;
        default:
            pr_warn("unknown device type 0x%x\n",
                state.device[i].radio_type);
            continue;
        }

        if (!state.device[i].vendor_id) {
            pr_warn("zero device %d while %d reported\n",
                i, state.count);
            continue;
        }

        rfkill = rfkill_alloc(name, &device->dev, type,
                      &hp_wmi_rfkill2_ops, (void *)(long)i);
        if (!rfkill) {
            err = -ENOMEM;
            goto fail;
        }

        rfkill2[rfkill2_count].id = state.device[i].rfkill_id;
        rfkill2[rfkill2_count].num = i;
        rfkill2[rfkill2_count].rfkill = rfkill;

        rfkill_init_sw_state(rfkill,
                     IS_SWBLOCKED(state.device[i].power));
        rfkill_set_hw_state(rfkill,
                    IS_HWBLOCKED(state.device[i].power));

        if (!(state.device[i].power & HPWMI_POWER_BIOS))
            pr_info("device %s blocked by BIOS\n", name);

        err = rfkill_register(rfkill);
        if (err) {
            rfkill_destroy(rfkill);
            goto fail;
        }

        rfkill2_count++;
    }

    return 0;
fail:
    for (; rfkill2_count > 0; rfkill2_count--) {
        rfkill_unregister(rfkill2[rfkill2_count - 1].rfkill);
        rfkill_destroy(rfkill2[rfkill2_count - 1].rfkill);
    }
    return err;
}

static int __devinit hp_wmi_bios_setup(struct platform_device *device)
{
    int err;

    /* clear detected rfkill devices */
    wifi_rfkill = NULL;
    bluetooth_rfkill = NULL;
    wwan_rfkill = NULL;
    rfkill2_count = 0;

    if (hp_wmi_rfkill_setup(device))
        hp_wmi_rfkill2_setup(device);

    err = device_create_file(&device->dev, &dev_attr_display);
    if (err)
        goto add_sysfs_error;
    err = device_create_file(&device->dev, &dev_attr_hddtemp);
    if (err)
        goto add_sysfs_error;
    err = device_create_file(&device->dev, &dev_attr_als);
    if (err)
        goto add_sysfs_error;
    err = device_create_file(&device->dev, &dev_attr_dock);
    if (err)
        goto add_sysfs_error;
    err = device_create_file(&device->dev, &dev_attr_tablet);
    if (err)
        goto add_sysfs_error;
    return 0;

add_sysfs_error:
    cleanup_sysfs(device);
    return err;
}

static int __exit hp_wmi_bios_remove(struct platform_device *device)
{
    int i;
    cleanup_sysfs(device);

    for (i = 0; i < rfkill2_count; i++) {
        rfkill_unregister(rfkill2[i].rfkill);
        rfkill_destroy(rfkill2[i].rfkill);
    }

    if (wifi_rfkill) {
        rfkill_unregister(wifi_rfkill);
        rfkill_destroy(wifi_rfkill);
    }
    if (bluetooth_rfkill) {
        rfkill_unregister(bluetooth_rfkill);
        rfkill_destroy(bluetooth_rfkill);
    }
    if (wwan_rfkill) {
        rfkill_unregister(wwan_rfkill);
        rfkill_destroy(wwan_rfkill);
    }

    return 0;
}

static int hp_wmi_resume_handler(struct device *device)
{
    /*
     * Hardware state may have changed while suspended, so trigger
     * input events for the current state. As this is a switch,
     * the input layer will only actually pass it on if the state
     * changed.
     */
    if (hp_wmi_input_dev) {
        input_report_switch(hp_wmi_input_dev, SW_DOCK,
                    hp_wmi_dock_state());
        input_report_switch(hp_wmi_input_dev, SW_TABLET_MODE,
                    hp_wmi_tablet_state());
        input_sync(hp_wmi_input_dev);
    }

    if (rfkill2_count)
        hp_wmi_rfkill2_refresh();

    if (wifi_rfkill)
        rfkill_set_states(wifi_rfkill,
                  hp_wmi_get_sw_state(HPWMI_WIFI),
                  hp_wmi_get_hw_state(HPWMI_WIFI));
    if (bluetooth_rfkill)
        rfkill_set_states(bluetooth_rfkill,
                  hp_wmi_get_sw_state(HPWMI_BLUETOOTH),
                  hp_wmi_get_hw_state(HPWMI_BLUETOOTH));
    if (wwan_rfkill)
        rfkill_set_states(wwan_rfkill,
                  hp_wmi_get_sw_state(HPWMI_WWAN),
                  hp_wmi_get_hw_state(HPWMI_WWAN));

    return 0;
}

static int __init hp_wmi_init(void)
{
    int err;
    int event_capable = wmi_has_guid(HPWMI_EVENT_GUID);
    int bios_capable = wmi_has_guid(HPWMI_BIOS_GUID);

    if (event_capable) {
        err = hp_wmi_input_setup();
        if (err)
            return err;
    }

    if (bios_capable) {
        err = platform_driver_register(&hp_wmi_driver);
        if (err)
            goto err_driver_reg;
        hp_wmi_platform_dev = platform_device_alloc("hp-wmi", -1);
        if (!hp_wmi_platform_dev) {
            err = -ENOMEM;
            goto err_device_alloc;
        }
        err = platform_device_add(hp_wmi_platform_dev);
        if (err)
            goto err_device_add;
    }

    if (!bios_capable && !event_capable)
        return -ENODEV;

    return 0;

err_device_add:
    platform_device_put(hp_wmi_platform_dev);
err_device_alloc:
    platform_driver_unregister(&hp_wmi_driver);
err_driver_reg:
    if (event_capable)
        hp_wmi_input_destroy();

    return err;
}

static void __exit hp_wmi_exit(void)
{
    if (wmi_has_guid(HPWMI_EVENT_GUID))
        hp_wmi_input_destroy();

    if (hp_wmi_platform_dev) {
        platform_device_unregister(hp_wmi_platform_dev);
        platform_driver_unregister(&hp_wmi_driver);
    }
}

module_init(hp_wmi_init);
module_exit(hp_wmi_exit);