/*
 *  toshiba_acpi.c - Toshiba Laptop ACPI Extras
 *
 *
 *  Copyright (C) 2002-2004 John Belmonte
 *  Copyright (C) 2008 Philip Langdale
 *  Copyright (C) 2010 Pierre Ducroquet
 *
 *  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
 *
 *
 *  The devolpment page for this driver is located at
 *  http://memebeam.org/toys/ToshibaAcpiDriver.
 *
 *  Credits:
 *      Jonathan A. Buzzard - Toshiba HCI info, and critical tips on reverse
 *              engineering the Windows drivers
 *      Yasushi Nagato - changes for linux kernel 2.4 -> 2.5
 *      Rob Miller - TV out and hotkeys help
 *
 *
 *  TODO
 *
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#define TOSHIBA_ACPI_VERSION    "0.19"
#define PROC_INTERFACE_VERSION  1

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/backlight.h>
#include <linux/platform_device.h>
#include <linux/rfkill.h>
#include <linux/input.h>
#include <linux/input/sparse-keymap.h>
#include <linux/leds.h>
#include <linux/slab.h>

#include <asm/uaccess.h>

#include <acpi/acpi_drivers.h>

MODULE_AUTHOR("John Belmonte");
MODULE_DESCRIPTION("Toshiba Laptop ACPI Extras Driver");
MODULE_LICENSE("GPL");

/* Toshiba ACPI method paths */
#define METHOD_LCD_BRIGHTNESS   "\\_SB_.PCI0.VGA_.LCD_._BCM"
#define TOSH_INTERFACE_1        "\\_SB_.VALD"
#define TOSH_INTERFACE_2        "\\_SB_.VALZ"
#define METHOD_VIDEO_OUT        "\\_SB_.VALX.DSSX"
#define GHCI_METHOD             ".GHCI"

/* Toshiba HCI interface definitions
 *
 * HCI is Toshiba's "Hardware Control Interface" which is supposed to
 * be uniform across all their models.  Ideally we would just call
 * dedicated ACPI methods instead of using this primitive interface.
 * However the ACPI methods seem to be incomplete in some areas (for
 * example they allow setting, but not reading, the LCD brightness value),
 * so this is still useful.
 */

#define HCI_WORDS                       6

/* operations */
#define HCI_SET                         0xff00
#define HCI_GET                         0xfe00

/* return codes */
#define HCI_SUCCESS                     0x0000
#define HCI_FAILURE                     0x1000
#define HCI_NOT_SUPPORTED               0x8000
#define HCI_EMPTY                       0x8c00

/* registers */
#define HCI_FAN                         0x0004
#define HCI_SYSTEM_EVENT                0x0016
#define HCI_VIDEO_OUT                   0x001c
#define HCI_HOTKEY_EVENT                0x001e
#define HCI_LCD_BRIGHTNESS              0x002a
#define HCI_WIRELESS                    0x0056

/* field definitions */
#define HCI_LCD_BRIGHTNESS_BITS         3
#define HCI_LCD_BRIGHTNESS_SHIFT        (16-HCI_LCD_BRIGHTNESS_BITS)
#define HCI_LCD_BRIGHTNESS_LEVELS       (1 << HCI_LCD_BRIGHTNESS_BITS)
#define HCI_VIDEO_OUT_LCD               0x1
#define HCI_VIDEO_OUT_CRT               0x2
#define HCI_VIDEO_OUT_TV                0x4
#define HCI_WIRELESS_KILL_SWITCH        0x01
#define HCI_WIRELESS_BT_PRESENT         0x0f
#define HCI_WIRELESS_BT_ATTACH          0x40
#define HCI_WIRELESS_BT_POWER           0x80

static const struct acpi_device_id toshiba_device_ids[] = {
        {"TOS6200", 0},
        {"TOS6208", 0},
        {"TOS1900", 0},
        {"", 0},
};
MODULE_DEVICE_TABLE(acpi, toshiba_device_ids);

static const struct key_entry toshiba_acpi_keymap[] __initconst = {
        { KE_KEY, 0x101, { KEY_MUTE } },
        { KE_KEY, 0x102, { KEY_ZOOMOUT } },
        { KE_KEY, 0x103, { KEY_ZOOMIN } },
        { KE_KEY, 0x13b, { KEY_COFFEE } },
        { KE_KEY, 0x13c, { KEY_BATTERY } },
        { KE_KEY, 0x13d, { KEY_SLEEP } },
        { KE_KEY, 0x13e, { KEY_SUSPEND } },
        { KE_KEY, 0x13f, { KEY_SWITCHVIDEOMODE } },
        { KE_KEY, 0x140, { KEY_BRIGHTNESSDOWN } },
        { KE_KEY, 0x141, { KEY_BRIGHTNESSUP } },
        { KE_KEY, 0x142, { KEY_WLAN } },
        { KE_KEY, 0x143, { KEY_PROG1 } },
        { KE_KEY, 0x17f, { KEY_FN } },
        { KE_KEY, 0xb05, { KEY_PROG2 } },
        { KE_KEY, 0xb06, { KEY_WWW } },
        { KE_KEY, 0xb07, { KEY_MAIL } },
        { KE_KEY, 0xb30, { KEY_STOP } },
        { KE_KEY, 0xb31, { KEY_PREVIOUSSONG } },
        { KE_KEY, 0xb32, { KEY_NEXTSONG } },
        { KE_KEY, 0xb33, { KEY_PLAYPAUSE } },
        { KE_KEY, 0xb5a, { KEY_MEDIA } },
        { KE_END, 0 },
};

/* utility
 */

static __inline__ void _set_bit(u32 * word, u32 mask, int value)
{
        *word = (*word & ~mask) | (mask * value);
}

/* acpi interface wrappers
 */

static int is_valid_acpi_path(const char *methodName)
{
        acpi_handle handle;
        acpi_status status;

        status = acpi_get_handle(NULL, (char *)methodName, &handle);
        return !ACPI_FAILURE(status);
}

static int write_acpi_int(const char *methodName, int val)
{
        struct acpi_object_list params;
        union acpi_object in_objs[1];
        acpi_status status;

        params.count = ARRAY_SIZE(in_objs);
        params.pointer = in_objs;
        in_objs[0].type = ACPI_TYPE_INTEGER;
        in_objs[0].integer.value = val;

        status = acpi_evaluate_object(NULL, (char *)methodName, &params, NULL);
        return (status == AE_OK);
}

#if 0
static int read_acpi_int(const char *methodName, int *pVal)
{
        struct acpi_buffer results;
        union acpi_object out_objs[1];
        acpi_status status;

        results.length = sizeof(out_objs);
        results.pointer = out_objs;

        status = acpi_evaluate_object(0, (char *)methodName, 0, &results);
        *pVal = out_objs[0].integer.value;

        return (status == AE_OK) && (out_objs[0].type == ACPI_TYPE_INTEGER);
}
#endif

static const char *method_hci /*= 0*/ ;

/* Perform a raw HCI call.  Here we don't care about input or output buffer
 * format.
 */
static acpi_status hci_raw(const u32 in[HCI_WORDS], u32 out[HCI_WORDS])
{
        struct acpi_object_list params;
        union acpi_object in_objs[HCI_WORDS];
        struct acpi_buffer results;
        union acpi_object out_objs[HCI_WORDS + 1];
        acpi_status status;
        int i;

        params.count = HCI_WORDS;
        params.pointer = in_objs;
        for (i = 0; i < HCI_WORDS; ++i) {
                in_objs[i].type = ACPI_TYPE_INTEGER;
                in_objs[i].integer.value = in[i];
        }

        results.length = sizeof(out_objs);
        results.pointer = out_objs;

        status = acpi_evaluate_object(NULL, (char *)method_hci, &params,
                                      &results);
        if ((status == AE_OK) && (out_objs->package.count <= HCI_WORDS)) {
                for (i = 0; i < out_objs->package.count; ++i) {
                        out[i] = out_objs->package.elements[i].integer.value;
                }
        }

        return status;
}

/* common hci tasks (get or set one or two value)
 *
 * In addition to the ACPI status, the HCI system returns a result which
 * may be useful (such as "not supported").
 */

static acpi_status hci_write1(u32 reg, u32 in1, u32 * result)
{
        u32 in[HCI_WORDS] = { HCI_SET, reg, in1, 0, 0, 0 };
        u32 out[HCI_WORDS];
        acpi_status status = hci_raw(in, out);
        *result = (status == AE_OK) ? out[0] : HCI_FAILURE;
        return status;
}

static acpi_status hci_read1(u32 reg, u32 * out1, u32 * result)
{
        u32 in[HCI_WORDS] = { HCI_GET, reg, 0, 0, 0, 0 };
        u32 out[HCI_WORDS];
        acpi_status status = hci_raw(in, out);
        *out1 = out[2];
        *result = (status == AE_OK) ? out[0] : HCI_FAILURE;
        return status;
}

static acpi_status hci_write2(u32 reg, u32 in1, u32 in2, u32 *result)
{
        u32 in[HCI_WORDS] = { HCI_SET, reg, in1, in2, 0, 0 };
        u32 out[HCI_WORDS];
        acpi_status status = hci_raw(in, out);
        *result = (status == AE_OK) ? out[0] : HCI_FAILURE;
        return status;
}

static acpi_status hci_read2(u32 reg, u32 *out1, u32 *out2, u32 *result)
{
        u32 in[HCI_WORDS] = { HCI_GET, reg, *out1, *out2, 0, 0 };
        u32 out[HCI_WORDS];
        acpi_status status = hci_raw(in, out);
        *out1 = out[2];
        *out2 = out[3];
        *result = (status == AE_OK) ? out[0] : HCI_FAILURE;
        return status;
}

struct toshiba_acpi_dev {
        struct platform_device *p_dev;
        struct rfkill *bt_rfk;
        struct input_dev *hotkey_dev;
        int illumination_installed;
        acpi_handle handle;

        const char *bt_name;

        struct mutex mutex;
};

/* Illumination support */
static int toshiba_illumination_available(void)
{
        u32 in[HCI_WORDS] = { 0, 0, 0, 0, 0, 0 };
        u32 out[HCI_WORDS];
        acpi_status status;

        in[0] = 0xf100;
        status = hci_raw(in, out);
        if (ACPI_FAILURE(status)) {
                pr_info("Illumination device not available\n");
                return 0;
        }
        in[0] = 0xf400;
        status = hci_raw(in, out);
        return 1;
}

static void toshiba_illumination_set(struct led_classdev *cdev,
                                     enum led_brightness brightness)
{
        u32 in[HCI_WORDS] = { 0, 0, 0, 0, 0, 0 };
        u32 out[HCI_WORDS];
        acpi_status status;

        /* First request : initialize communication. */
        in[0] = 0xf100;
        status = hci_raw(in, out);
        if (ACPI_FAILURE(status)) {
                pr_info("Illumination device not available\n");
                return;
        }

        if (brightness) {
                /* Switch the illumination on */
                in[0] = 0xf400;
                in[1] = 0x14e;
                in[2] = 1;
                status = hci_raw(in, out);
                if (ACPI_FAILURE(status)) {
                        pr_info("ACPI call for illumination failed\n");
                        return;
                }
        } else {
                /* Switch the illumination off */
                in[0] = 0xf400;
                in[1] = 0x14e;
                in[2] = 0;
                status = hci_raw(in, out);
                if (ACPI_FAILURE(status)) {
                        pr_info("ACPI call for illumination failed.\n");
                        return;
                }
        }

        /* Last request : close communication. */
        in[0] = 0xf200;
        in[1] = 0;
        in[2] = 0;
        hci_raw(in, out);
}

static enum led_brightness toshiba_illumination_get(struct led_classdev *cdev)
{
        u32 in[HCI_WORDS] = { 0, 0, 0, 0, 0, 0 };
        u32 out[HCI_WORDS];
        acpi_status status;
        enum led_brightness result;

        /* First request : initialize communication. */
        in[0] = 0xf100;
        status = hci_raw(in, out);
        if (ACPI_FAILURE(status)) {
                pr_info("Illumination device not available\n");
                return LED_OFF;
        }

        /* Check the illumination */
        in[0] = 0xf300;
        in[1] = 0x14e;
        status = hci_raw(in, out);
        if (ACPI_FAILURE(status)) {
                pr_info("ACPI call for illumination failed.\n");
                return LED_OFF;
        }

        result = out[2] ? LED_FULL : LED_OFF;

        /* Last request : close communication. */
        in[0] = 0xf200;
        in[1] = 0;
        in[2] = 0;
        hci_raw(in, out);

        return result;
}

static struct led_classdev toshiba_led = {
        .name           = "toshiba::illumination",
        .max_brightness = 1,
        .brightness_set = toshiba_illumination_set,
        .brightness_get = toshiba_illumination_get,
};

static struct toshiba_acpi_dev toshiba_acpi = {
        .bt_name = "Toshiba Bluetooth",
};

/* Bluetooth rfkill handlers */

static u32 hci_get_bt_present(bool *present)
{
        u32 hci_result;
        u32 value, value2;

        value = 0;
        value2 = 0;
        hci_read2(HCI_WIRELESS, &value, &value2, &hci_result);
        if (hci_result == HCI_SUCCESS)
                *present = (value & HCI_WIRELESS_BT_PRESENT) ? true : false;

        return hci_result;
}

static u32 hci_get_radio_state(bool *radio_state)
{
        u32 hci_result;
        u32 value, value2;

        value = 0;
        value2 = 0x0001;
        hci_read2(HCI_WIRELESS, &value, &value2, &hci_result);

        *radio_state = value & HCI_WIRELESS_KILL_SWITCH;
        return hci_result;
}

static int bt_rfkill_set_block(void *data, bool blocked)
{
        struct toshiba_acpi_dev *dev = data;
        u32 result1, result2;
        u32 value;
        int err;
        bool radio_state;

        value = (blocked == false);

        mutex_lock(&dev->mutex);
        if (hci_get_radio_state(&radio_state) != HCI_SUCCESS) {
                err = -EBUSY;
                goto out;
        }

        if (!radio_state) {
                err = 0;
                goto out;
        }

        hci_write2(HCI_WIRELESS, value, HCI_WIRELESS_BT_POWER, &result1);
        hci_write2(HCI_WIRELESS, value, HCI_WIRELESS_BT_ATTACH, &result2);

        if (result1 != HCI_SUCCESS || result2 != HCI_SUCCESS)
                err = -EBUSY;
        else
                err = 0;
 out:
        mutex_unlock(&dev->mutex);
        return err;
}

static void bt_rfkill_poll(struct rfkill *rfkill, void *data)
{
        bool new_rfk_state;
        bool value;
        u32 hci_result;
        struct toshiba_acpi_dev *dev = data;

        mutex_lock(&dev->mutex);

        hci_result = hci_get_radio_state(&value);
        if (hci_result != HCI_SUCCESS) {
                /* Can't do anything useful */
                mutex_unlock(&dev->mutex);
                return;
        }

        new_rfk_state = value;

        mutex_unlock(&dev->mutex);

        if (rfkill_set_hw_state(rfkill, !new_rfk_state))
                bt_rfkill_set_block(data, true);
}

static const struct rfkill_ops toshiba_rfk_ops = {
        .set_block = bt_rfkill_set_block,
        .poll = bt_rfkill_poll,
};

static struct proc_dir_entry *toshiba_proc_dir /*= 0*/ ;
static struct backlight_device *toshiba_backlight_device;
static int force_fan;
static int last_key_event;
static int key_event_valid;

static int get_lcd(struct backlight_device *bd)
{
        u32 hci_result;
        u32 value;

        hci_read1(HCI_LCD_BRIGHTNESS, &value, &hci_result);
        if (hci_result == HCI_SUCCESS) {
                return (value >> HCI_LCD_BRIGHTNESS_SHIFT);
        } else
                return -EFAULT;
}

static int lcd_proc_show(struct seq_file *m, void *v)
{
        int value = get_lcd(NULL);

        if (value >= 0) {
                seq_printf(m, "brightness:              %d\n", value);
                seq_printf(m, "brightness_levels:       %d\n",
                             HCI_LCD_BRIGHTNESS_LEVELS);
        } else {
                pr_err("Error reading LCD brightness\n");
        }

        return 0;
}

static int lcd_proc_open(struct inode *inode, struct file *file)
{
        return single_open(file, lcd_proc_show, NULL);
}

static int set_lcd(int value)
{
        u32 hci_result;

        value = value << HCI_LCD_BRIGHTNESS_SHIFT;
        hci_write1(HCI_LCD_BRIGHTNESS, value, &hci_result);
        if (hci_result != HCI_SUCCESS)
                return -EFAULT;

        return 0;
}

static int set_lcd_status(struct backlight_device *bd)
{
        return set_lcd(bd->props.brightness);
}

static ssize_t lcd_proc_write(struct file *file, const char __user *buf,
                              size_t count, loff_t *pos)
{
        char cmd[42];
        size_t len;
        int value;
        int ret;

        len = min(count, sizeof(cmd) - 1);
        if (copy_from_user(cmd, buf, len))
                return -EFAULT;
        cmd[len] = '\0';

        if (sscanf(cmd, " brightness : %i", &value) == 1 &&
            value >= 0 && value < HCI_LCD_BRIGHTNESS_LEVELS) {
                ret = set_lcd(value);
                if (ret == 0)
                        ret = count;
        } else {
                ret = -EINVAL;
        }
        return ret;
}

static const struct file_operations lcd_proc_fops = {
        .owner          = THIS_MODULE,
        .open           = lcd_proc_open,
        .read           = seq_read,
        .llseek         = seq_lseek,
        .release        = single_release,
        .write          = lcd_proc_write,
};

static int video_proc_show(struct seq_file *m, void *v)
{
        u32 hci_result;
        u32 value;

        hci_read1(HCI_VIDEO_OUT, &value, &hci_result);
        if (hci_result == HCI_SUCCESS) {
                int is_lcd = (value & HCI_VIDEO_OUT_LCD) ? 1 : 0;
                int is_crt = (value & HCI_VIDEO_OUT_CRT) ? 1 : 0;
                int is_tv = (value & HCI_VIDEO_OUT_TV) ? 1 : 0;
                seq_printf(m, "lcd_out:                 %d\n", is_lcd);
                seq_printf(m, "crt_out:                 %d\n", is_crt);
                seq_printf(m, "tv_out:                  %d\n", is_tv);
        } else {
                pr_err("Error reading video out status\n");
        }

        return 0;
}

static int video_proc_open(struct inode *inode, struct file *file)
{
        return single_open(file, video_proc_show, NULL);
}

static ssize_t video_proc_write(struct file *file, const char __user *buf,
                                size_t count, loff_t *pos)
{
        char *cmd, *buffer;
        int value;
        int remain = count;
        int lcd_out = -1;
        int crt_out = -1;
        int tv_out = -1;
        u32 hci_result;
        u32 video_out;

        cmd = kmalloc(count + 1, GFP_KERNEL);
        if (!cmd)
                return -ENOMEM;
        if (copy_from_user(cmd, buf, count)) {
                kfree(cmd);
                return -EFAULT;
        }
        cmd[count] = '\0';

        buffer = cmd;

        /* scan expression.  Multiple expressions may be delimited with ;
         *
         *  NOTE: to keep scanning simple, invalid fields are ignored
         */
        while (remain) {
                if (sscanf(buffer, " lcd_out : %i", &value) == 1)
                        lcd_out = value & 1;
                else if (sscanf(buffer, " crt_out : %i", &value) == 1)
                        crt_out = value & 1;
                else if (sscanf(buffer, " tv_out : %i", &value) == 1)
                        tv_out = value & 1;
                /* advance to one character past the next ; */
                do {
                        ++buffer;
                        --remain;
                }
                while (remain && *(buffer - 1) != ';');
        }

        kfree(cmd);

        hci_read1(HCI_VIDEO_OUT, &video_out, &hci_result);
        if (hci_result == HCI_SUCCESS) {
                unsigned int new_video_out = video_out;
                if (lcd_out != -1)
                        _set_bit(&new_video_out, HCI_VIDEO_OUT_LCD, lcd_out);
                if (crt_out != -1)
                        _set_bit(&new_video_out, HCI_VIDEO_OUT_CRT, crt_out);
                if (tv_out != -1)
                        _set_bit(&new_video_out, HCI_VIDEO_OUT_TV, tv_out);
                /* To avoid unnecessary video disruption, only write the new
                 * video setting if something changed. */
                if (new_video_out != video_out)
                        write_acpi_int(METHOD_VIDEO_OUT, new_video_out);
        } else {
                return -EFAULT;
        }

        return count;
}

static const struct file_operations video_proc_fops = {
        .owner          = THIS_MODULE,
        .open           = video_proc_open,
        .read           = seq_read,
        .llseek         = seq_lseek,
        .release        = single_release,
        .write          = video_proc_write,
};

static int fan_proc_show(struct seq_file *m, void *v)
{
        u32 hci_result;
        u32 value;

        hci_read1(HCI_FAN, &value, &hci_result);
        if (hci_result == HCI_SUCCESS) {
                seq_printf(m, "running:                 %d\n", (value > 0));
                seq_printf(m, "force_on:                %d\n", force_fan);
        } else {
                pr_err("Error reading fan status\n");
        }

        return 0;
}

static int fan_proc_open(struct inode *inode, struct file *file)
{
        return single_open(file, fan_proc_show, NULL);
}

static ssize_t fan_proc_write(struct file *file, const char __user *buf,
                              size_t count, loff_t *pos)
{
        char cmd[42];
        size_t len;
        int value;
        u32 hci_result;

        len = min(count, sizeof(cmd) - 1);
        if (copy_from_user(cmd, buf, len))
                return -EFAULT;
        cmd[len] = '\0';

        if (sscanf(cmd, " force_on : %i", &value) == 1 &&
            value >= 0 && value <= 1) {
                hci_write1(HCI_FAN, value, &hci_result);
                if (hci_result != HCI_SUCCESS)
                        return -EFAULT;
                else
                        force_fan = value;
        } else {
                return -EINVAL;
        }

        return count;
}

static const struct file_operations fan_proc_fops = {
        .owner          = THIS_MODULE,
        .open           = fan_proc_open,
        .read           = seq_read,
        .llseek         = seq_lseek,
        .release        = single_release,
        .write          = fan_proc_write,
};

static int keys_proc_show(struct seq_file *m, void *v)
{
        u32 hci_result;
        u32 value;

        if (!key_event_valid) {
                hci_read1(HCI_SYSTEM_EVENT, &value, &hci_result);
                if (hci_result == HCI_SUCCESS) {
                        key_event_valid = 1;
                        last_key_event = value;
                } else if (hci_result == HCI_EMPTY) {
                        /* better luck next time */
                } else if (hci_result == HCI_NOT_SUPPORTED) {
                        /* This is a workaround for an unresolved issue on
                         * some machines where system events sporadically
                         * become disabled. */
                        hci_write1(HCI_SYSTEM_EVENT, 1, &hci_result);
                        pr_notice("Re-enabled hotkeys\n");
                } else {
                        pr_err("Error reading hotkey status\n");
                        goto end;
                }
        }

        seq_printf(m, "hotkey_ready:            %d\n", key_event_valid);
        seq_printf(m, "hotkey:                  0x%04x\n", last_key_event);
end:
        return 0;
}

static int keys_proc_open(struct inode *inode, struct file *file)
{
        return single_open(file, keys_proc_show, NULL);
}

static ssize_t keys_proc_write(struct file *file, const char __user *buf,
                               size_t count, loff_t *pos)
{
        char cmd[42];
        size_t len;
        int value;

        len = min(count, sizeof(cmd) - 1);
        if (copy_from_user(cmd, buf, len))
                return -EFAULT;
        cmd[len] = '\0';

        if (sscanf(cmd, " hotkey_ready : %i", &value) == 1 && value == 0) {
                key_event_valid = 0;
        } else {
                return -EINVAL;
        }

        return count;
}

static const struct file_operations keys_proc_fops = {
        .owner          = THIS_MODULE,
        .open           = keys_proc_open,
        .read           = seq_read,
        .llseek         = seq_lseek,
        .release        = single_release,
        .write          = keys_proc_write,
};

static int version_proc_show(struct seq_file *m, void *v)
{
        seq_printf(m, "driver:                  %s\n", TOSHIBA_ACPI_VERSION);
        seq_printf(m, "proc_interface:          %d\n", PROC_INTERFACE_VERSION);
        return 0;
}

static int version_proc_open(struct inode *inode, struct file *file)
{
        return single_open(file, version_proc_show, PDE(inode)->data);
}

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

/* proc and module init
 */

#define PROC_TOSHIBA            "toshiba"

static void __init create_toshiba_proc_entries(void)
{
        proc_create("lcd", S_IRUGO | S_IWUSR, toshiba_proc_dir, &lcd_proc_fops);
        proc_create("video", S_IRUGO | S_IWUSR, toshiba_proc_dir, &video_proc_fops);
        proc_create("fan", S_IRUGO | S_IWUSR, toshiba_proc_dir, &fan_proc_fops);
        proc_create("keys", S_IRUGO | S_IWUSR, toshiba_proc_dir, &keys_proc_fops);
        proc_create("version", S_IRUGO, toshiba_proc_dir, &version_proc_fops);
}

static void remove_toshiba_proc_entries(void)
{
        remove_proc_entry("lcd", toshiba_proc_dir);
        remove_proc_entry("video", toshiba_proc_dir);
        remove_proc_entry("fan", toshiba_proc_dir);
        remove_proc_entry("keys", toshiba_proc_dir);
        remove_proc_entry("version", toshiba_proc_dir);
}

static const struct backlight_ops toshiba_backlight_data = {
        .get_brightness = get_lcd,
        .update_status  = set_lcd_status,
};

static void toshiba_acpi_notify(acpi_handle handle, u32 event, void *context)
{
        u32 hci_result, value;

        if (event != 0x80)
                return;
        do {
                hci_read1(HCI_SYSTEM_EVENT, &value, &hci_result);
                if (hci_result == HCI_SUCCESS) {
                        if (value == 0x100)
                                continue;
                        /* act on key press; ignore key release */
                        if (value & 0x80)
                                continue;

                        if (!sparse_keymap_report_event(toshiba_acpi.hotkey_dev,
                                                        value, 1, true)) {
                                pr_info("Unknown key %x\n",
                                       value);
                        }
                } else if (hci_result == HCI_NOT_SUPPORTED) {
                        /* This is a workaround for an unresolved issue on
                         * some machines where system events sporadically
                         * become disabled. */
                        hci_write1(HCI_SYSTEM_EVENT, 1, &hci_result);
                        pr_notice("Re-enabled hotkeys\n");
                }
        } while (hci_result != HCI_EMPTY);
}

static int __init toshiba_acpi_setup_keyboard(char *device)
{
        acpi_status status;
        int error;

        status = acpi_get_handle(NULL, device, &toshiba_acpi.handle);
        if (ACPI_FAILURE(status)) {
                pr_info("Unable to get notification device\n");
                return -ENODEV;
        }

        toshiba_acpi.hotkey_dev = input_allocate_device();
        if (!toshiba_acpi.hotkey_dev) {
                pr_info("Unable to register input device\n");
                return -ENOMEM;
        }

        toshiba_acpi.hotkey_dev->name = "Toshiba input device";
        toshiba_acpi.hotkey_dev->phys = device;
        toshiba_acpi.hotkey_dev->id.bustype = BUS_HOST;

        error = sparse_keymap_setup(toshiba_acpi.hotkey_dev,
                                    toshiba_acpi_keymap, NULL);
        if (error)
                goto err_free_dev;

        status = acpi_install_notify_handler(toshiba_acpi.handle,
                                ACPI_DEVICE_NOTIFY, toshiba_acpi_notify, NULL);
        if (ACPI_FAILURE(status)) {
                pr_info("Unable to install hotkey notification\n");
                error = -ENODEV;
                goto err_free_keymap;
        }

        status = acpi_evaluate_object(toshiba_acpi.handle, "ENAB", NULL, NULL);
        if (ACPI_FAILURE(status)) {
                pr_info("Unable to enable hotkeys\n");
                error = -ENODEV;
                goto err_remove_notify;
        }

        error = input_register_device(toshiba_acpi.hotkey_dev);
        if (error) {
                pr_info("Unable to register input device\n");
                goto err_remove_notify;
        }

        return 0;

 err_remove_notify:
        acpi_remove_notify_handler(toshiba_acpi.handle,
                                   ACPI_DEVICE_NOTIFY, toshiba_acpi_notify);
 err_free_keymap:
        sparse_keymap_free(toshiba_acpi.hotkey_dev);
 err_free_dev:
        input_free_device(toshiba_acpi.hotkey_dev);
        toshiba_acpi.hotkey_dev = NULL;
        return error;
}

static void toshiba_acpi_exit(void)
{
        if (toshiba_acpi.hotkey_dev) {
                acpi_remove_notify_handler(toshiba_acpi.handle,
                                ACPI_DEVICE_NOTIFY, toshiba_acpi_notify);
                sparse_keymap_free(toshiba_acpi.hotkey_dev);
                input_unregister_device(toshiba_acpi.hotkey_dev);
        }

        if (toshiba_acpi.bt_rfk) {
                rfkill_unregister(toshiba_acpi.bt_rfk);
                rfkill_destroy(toshiba_acpi.bt_rfk);
        }

        if (toshiba_backlight_device)
                backlight_device_unregister(toshiba_backlight_device);

        remove_toshiba_proc_entries();

        if (toshiba_proc_dir)
                remove_proc_entry(PROC_TOSHIBA, acpi_root_dir);

        if (toshiba_acpi.illumination_installed)
                led_classdev_unregister(&toshiba_led);

        platform_device_unregister(toshiba_acpi.p_dev);

        return;
}

static int __init toshiba_acpi_init(void)
{
        u32 hci_result;
        bool bt_present;
        int ret = 0;
        struct backlight_properties props;

        if (acpi_disabled)
                return -ENODEV;

        /* simple device detection: look for HCI method */
        if (is_valid_acpi_path(TOSH_INTERFACE_1 GHCI_METHOD)) {
                method_hci = TOSH_INTERFACE_1 GHCI_METHOD;
                if (toshiba_acpi_setup_keyboard(TOSH_INTERFACE_1))
                        pr_info("Unable to activate hotkeys\n");
        } else if (is_valid_acpi_path(TOSH_INTERFACE_2 GHCI_METHOD)) {
                method_hci = TOSH_INTERFACE_2 GHCI_METHOD;
                if (toshiba_acpi_setup_keyboard(TOSH_INTERFACE_2))
                        pr_info("Unable to activate hotkeys\n");
        } else
                return -ENODEV;

        pr_info("Toshiba Laptop ACPI Extras version %s\n",
               TOSHIBA_ACPI_VERSION);
        pr_info("    HCI method: %s\n", method_hci);

        mutex_init(&toshiba_acpi.mutex);

        toshiba_acpi.p_dev = platform_device_register_simple("toshiba_acpi",
                                                              -1, NULL, 0);
        if (IS_ERR(toshiba_acpi.p_dev)) {
                ret = PTR_ERR(toshiba_acpi.p_dev);
                pr_err("unable to register platform device\n");
                toshiba_acpi.p_dev = NULL;
                toshiba_acpi_exit();

                return ret;
        }

        force_fan = 0;
        key_event_valid = 0;

        /* enable event fifo */
        hci_write1(HCI_SYSTEM_EVENT, 1, &hci_result);

        toshiba_proc_dir = proc_mkdir(PROC_TOSHIBA, acpi_root_dir);
        if (!toshiba_proc_dir) {
                toshiba_acpi_exit();
                return -ENODEV;
        } else {
                create_toshiba_proc_entries();
        }

        props.type = BACKLIGHT_PLATFORM;
        props.max_brightness = HCI_LCD_BRIGHTNESS_LEVELS - 1;
        toshiba_backlight_device = backlight_device_register("toshiba",
                                                             &toshiba_acpi.p_dev->dev,
                                                             NULL,
                                                             &toshiba_backlight_data,
                                                             &props);
        if (IS_ERR(toshiba_backlight_device)) {
                ret = PTR_ERR(toshiba_backlight_device);

                pr_err("Could not register toshiba backlight device\n");
                toshiba_backlight_device = NULL;
                toshiba_acpi_exit();
                return ret;
        }

        /* Register rfkill switch for Bluetooth */
        if (hci_get_bt_present(&bt_present) == HCI_SUCCESS && bt_present) {
                toshiba_acpi.bt_rfk = rfkill_alloc(toshiba_acpi.bt_name,
                                                   &toshiba_acpi.p_dev->dev,
                                                   RFKILL_TYPE_BLUETOOTH,
                                                   &toshiba_rfk_ops,
                                                   &toshiba_acpi);
                if (!toshiba_acpi.bt_rfk) {
                        pr_err("unable to allocate rfkill device\n");
                        toshiba_acpi_exit();
                        return -ENOMEM;
                }

                ret = rfkill_register(toshiba_acpi.bt_rfk);
                if (ret) {
                        pr_err("unable to register rfkill device\n");
                        rfkill_destroy(toshiba_acpi.bt_rfk);
                        toshiba_acpi_exit();
                        return ret;
                }
        }

        toshiba_acpi.illumination_installed = 0;
        if (toshiba_illumination_available()) {
                if (!led_classdev_register(&(toshiba_acpi.p_dev->dev),
                                           &toshiba_led))
                        toshiba_acpi.illumination_installed = 1;
        }

        return 0;
}

module_init(toshiba_acpi_init);
module_exit(toshiba_acpi_exit);