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

/*

  Copyright (C) 2006 Lennart Poettering <mzxreary (at) 0pointer (dot) de>

  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.

 */

/*

 * msi-laptop.c - MSI S270 laptop support. This laptop is sold under

 * various brands, including "Cytron/TCM/Medion/Tchibo MD96100".

 *

 * Driver also supports S271, S420 models.

 *

 * This driver exports a few files in /sys/devices/platform/msi-laptop-pf/:

 *

 *   lcd_level - Screen brightness: contains a single integer in the

 *   range 0..8. (rw)

 *

 *   auto_brightness - Enable automatic brightness control: contains

 *   either 0 or 1. If set to 1 the hardware adjusts the screen

 *   brightness automatically when the power cord is

 *   plugged/unplugged. (rw)

 *

 *   wlan - WLAN subsystem enabled: contains either 0 or 1. (ro)

 *

 *   bluetooth - Bluetooth subsystem enabled: contains either 0 or 1

 *   Please note that this file is constantly 0 if no Bluetooth

 *   hardware is available. (ro)

 *

 * In addition to these platform device attributes the driver

 * registers itself in the Linux backlight control subsystem and is

 * available to userspace under /sys/class/backlight/msi-laptop-bl/.

 *

 * This driver might work on other laptops produced by MSI. If you

 * want to try it you can pass force=1 as argument to the module which

 * will force it to load even when the DMI data doesn't identify the

 * laptop as MSI S270. YMMV.

 */

#include <linux/module.h>

#include <linux/kernel.h>

#include <linux/init.h>

#include <linux/acpi.h>

#include <linux/dmi.h>

#include <linux/backlight.h>

#include <linux/platform_device.h>

#include <linux/autoconf.h>

#define MSI_DRIVER_VERSION "0.5"

#define MSI_LCD_LEVEL_MAX 9

#define MSI_EC_COMMAND_WIRELESS 0x10

#define MSI_EC_COMMAND_LCD_LEVEL 0x11

static int force;

module_param(force, bool, 0);

MODULE_PARM_DESC(force, "Force driver load, ignore DMI data");

static int auto_brightness;

module_param(auto_brightness, int, 0);

MODULE_PARM_DESC(auto_brightness, "Enable automatic brightness control (0: disabled; 1: enabled; 2: don't touch)");

/* Hardware access */

static int set_lcd_level(int level)

{

        u8 buf[2];

        if (level < 0 || level >= MSI_LCD_LEVEL_MAX)

                return -EINVAL;

        buf[0] = 0x80;

        buf[1] = (u8) (level*31);

        return ec_transaction(MSI_EC_COMMAND_LCD_LEVEL, buf, sizeof(buf), NULL, 0, 1);

}

static int get_lcd_level(void)

{

        u8 wdata = 0, rdata;

        int result;

        result = ec_transaction(MSI_EC_COMMAND_LCD_LEVEL, &wdata, 1, &rdata, 1, 1);

        if (result < 0)

                return result;

        return (int) rdata / 31;

}

static int get_auto_brightness(void)

{

        u8 wdata = 4, rdata;

        int result;

        result = ec_transaction(MSI_EC_COMMAND_LCD_LEVEL, &wdata, 1, &rdata, 1, 1);

        if (result < 0)

                return result;

        return !!(rdata & 8);

}

static int set_auto_brightness(int enable)

{

        u8 wdata[2], rdata;

        int result;

        wdata[0] = 4;

        result = ec_transaction(MSI_EC_COMMAND_LCD_LEVEL, wdata, 1, &rdata, 1, 1);

        if (result < 0)

                return result;

        wdata[0] = 0x84;

        wdata[1] = (rdata & 0xF7) | (enable ? 8 : 0);

        return ec_transaction(MSI_EC_COMMAND_LCD_LEVEL, wdata, 2, NULL, 0, 1);

}

static int get_wireless_state(int *wlan, int *bluetooth)

{

        u8 wdata = 0, rdata;

        int result;

        result = ec_transaction(MSI_EC_COMMAND_WIRELESS, &wdata, 1, &rdata, 1, 1);

        if (result < 0)

                return -1;

        if (wlan)

                *wlan = !!(rdata & 8);

        if (bluetooth)

                *bluetooth = !!(rdata & 128);

        return 0;

}

/* Backlight device stuff */

static int bl_get_brightness(struct backlight_device *b)

{

        return get_lcd_level();

}

static int bl_update_status(struct backlight_device *b)

{

        return set_lcd_level(b->props.brightness);

}

static struct backlight_ops msibl_ops = {

        .get_brightness = bl_get_brightness,

        .update_status  = bl_update_status,

};

static struct backlight_device *msibl_device;

/* Platform device */

static ssize_t show_wlan(struct device *dev,

        struct device_attribute *attr, char *buf)

{

        int ret, enabled;

        ret = get_wireless_state(&enabled, NULL);

        if (ret < 0)

                return ret;

        return sprintf(buf, "%i\n", enabled);

}

static ssize_t show_bluetooth(struct device *dev,

        struct device_attribute *attr, char *buf)

{

        int ret, enabled;

        ret = get_wireless_state(NULL, &enabled);

        if (ret < 0)

                return ret;

        return sprintf(buf, "%i\n", enabled);

}

static ssize_t show_lcd_level(struct device *dev,

        struct device_attribute *attr, char *buf)

{

        int ret;

        ret = get_lcd_level();

        if (ret < 0)

                return ret;

        return sprintf(buf, "%i\n", ret);

}

static ssize_t store_lcd_level(struct device *dev,

        struct device_attribute *attr, const char *buf, size_t count)

{

        int level, ret;

        if (sscanf(buf, "%i", &level) != 1 || (level < 0 || level >= MSI_LCD_LEVEL_MAX))

                return -EINVAL;

        ret = set_lcd_level(level);

        if (ret < 0)

                return ret;

        return count;

}

static ssize_t show_auto_brightness(struct device *dev,

        struct device_attribute *attr, char *buf)

{

        int ret;

        ret = get_auto_brightness();

        if (ret < 0)

                return ret;

        return sprintf(buf, "%i\n", ret);

}

static ssize_t store_auto_brightness(struct device *dev,

        struct device_attribute *attr, const char *buf, size_t count)

{

        int enable, ret;

        if (sscanf(buf, "%i", &enable) != 1 || (enable != (enable & 1)))

                return -EINVAL;

        ret = set_auto_brightness(enable);

        if (ret < 0)

                return ret;

        return count;

}

static DEVICE_ATTR(lcd_level, 0644, show_lcd_level, store_lcd_level);

static DEVICE_ATTR(auto_brightness, 0644, show_auto_brightness, store_auto_brightness);

static DEVICE_ATTR(bluetooth, 0444, show_bluetooth, NULL);

static DEVICE_ATTR(wlan, 0444, show_wlan, NULL);

static struct attribute *msipf_attributes[] = {

        &dev_attr_lcd_level.attr,

        &dev_attr_auto_brightness.attr,

        &dev_attr_bluetooth.attr,

        &dev_attr_wlan.attr,

        NULL

};

static struct attribute_group msipf_attribute_group = {

        .attrs = msipf_attributes

};

static struct platform_driver msipf_driver = {

        .driver = {

                .name = "msi-laptop-pf",

                .owner = THIS_MODULE,

        }

};

static struct platform_device *msipf_device;

/* Initialization */

static int dmi_check_cb(const struct dmi_system_id *id)

{

        printk("msi-laptop: Identified laptop model '%s'.\n", id->ident);

        return 0;

}

static struct dmi_system_id __initdata msi_dmi_table[] = {

        {

                .ident = "MSI S270",

                .matches = {

                        DMI_MATCH(DMI_SYS_VENDOR, "MICRO-STAR INT'L CO.,LTD"),

                        DMI_MATCH(DMI_PRODUCT_NAME, "MS-1013"),

                        DMI_MATCH(DMI_PRODUCT_VERSION, "0131"),

                        DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-STAR INT'L CO.,LTD")

                },

                .callback = dmi_check_cb

        },

        {

                .ident = "MSI S271",

                .matches = {

                        DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star International"),

                        DMI_MATCH(DMI_PRODUCT_NAME, "MS-1058"),

                        DMI_MATCH(DMI_PRODUCT_VERSION, "0581"),

                        DMI_MATCH(DMI_BOARD_NAME, "MS-1058")

                },

                .callback = dmi_check_cb

        },

        {

                .ident = "MSI S420",

                .matches = {

                        DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star International"),

                        DMI_MATCH(DMI_PRODUCT_NAME, "MS-1412"),

                        DMI_MATCH(DMI_BOARD_VENDOR, "MSI"),

                        DMI_MATCH(DMI_BOARD_NAME, "MS-1412")

                },

                .callback = dmi_check_cb

        },

        {

                .ident = "Medion MD96100",

                .matches = {

                        DMI_MATCH(DMI_SYS_VENDOR, "NOTEBOOK"),

                        DMI_MATCH(DMI_PRODUCT_NAME, "SAM2000"),

                        DMI_MATCH(DMI_PRODUCT_VERSION, "0131"),

                        DMI_MATCH(DMI_CHASSIS_VENDOR, "MICRO-STAR INT'L CO.,LTD")

                },

                .callback = dmi_check_cb

        },

        { }

};

static int __init msi_init(void)

{

        int ret;

        if (acpi_disabled)

                return -ENODEV;

        if (!force && !dmi_check_system(msi_dmi_table))

                return -ENODEV;

        if (auto_brightness < 0 || auto_brightness > 2)

                return -EINVAL;

        /* Register backlight stuff */

        msibl_device = backlight_device_register("msi-laptop-bl", NULL, NULL,

                                                &msibl_ops);

        if (IS_ERR(msibl_device))

                return PTR_ERR(msibl_device);

        msibl_device->props.max_brightness = MSI_LCD_LEVEL_MAX-1;

        ret = platform_driver_register(&msipf_driver);

        if (ret)

                goto fail_backlight;

        /* Register platform stuff */

        msipf_device = platform_device_alloc("msi-laptop-pf", -1);

        if (!msipf_device) {

                ret = -ENOMEM;

                goto fail_platform_driver;

        }

        ret = platform_device_add(msipf_device);

        if (ret)

                goto fail_platform_device1;

        ret = sysfs_create_group(&msipf_device->dev.kobj, &msipf_attribute_group);

        if (ret)

                goto fail_platform_device2;

        /* Disable automatic brightness control by default because

         * this module was probably loaded to do brightness control in

         * software. */

        if (auto_brightness != 2)

                set_auto_brightness(auto_brightness);

        printk(KERN_INFO "msi-laptop: driver "MSI_DRIVER_VERSION" successfully loaded.\n");

        return 0;

fail_platform_device2:

        platform_device_del(msipf_device);

fail_platform_device1:

        platform_device_put(msipf_device);

fail_platform_driver:

        platform_driver_unregister(&msipf_driver);

fail_backlight:

        backlight_device_unregister(msibl_device);

        return ret;

}

static void __exit msi_cleanup(void)

{

        sysfs_remove_group(&msipf_device->dev.kobj, &msipf_attribute_group);

        platform_device_unregister(msipf_device);

        platform_driver_unregister(&msipf_driver);

        backlight_device_unregister(msibl_device);

        /* Enable automatic brightness control again */

        if (auto_brightness != 2)

                set_auto_brightness(1);

        printk(KERN_INFO "msi-laptop: driver unloaded.\n");

}

module_init(msi_init);

module_exit(msi_cleanup);

MODULE_AUTHOR("Lennart Poettering");

MODULE_DESCRIPTION("MSI Laptop Support");

MODULE_VERSION(MSI_DRIVER_VERSION);

MODULE_LICENSE("GPL");

MODULE_ALIAS("dmi:*:svnMICRO-STARINT'LCO.,LTD:pnMS-1013:pvr0131*:cvnMICRO-STARINT'LCO.,LTD:ct10:*");

MODULE_ALIAS("dmi:*:svnMicro-StarInternational:pnMS-1058:pvr0581:rvnMSI:rnMS-1058:*:ct10:*");

MODULE_ALIAS("dmi:*:svnMicro-StarInternational:pnMS-1412:*:rvnMSI:rnMS-1412:*:cvnMICRO-STARINT'LCO.,LTD:ct10:*");

MODULE_ALIAS("dmi:*:svnNOTEBOOK:pnSAM2000:pvr0131*:cvnMICRO-STARINT'LCO.,LTD:ct10:*");