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/*

 *  asus-laptop.c - Asus Laptop Support

 *

 *

 *  Copyright (C) 2002-2005 Julien Lerouge, 2003-2006 Karol Kozimor

 *  Copyright (C) 2006-2007 Corentin Chary

 *

 *  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 development page for this driver is located at

 *  http://sourceforge.net/projects/acpi4asus/

 *

 *  Credits:

 *  Pontus Fuchs   - Helper functions, cleanup

 *  Johann Wiesner - Small compile fixes

 *  John Belmonte  - ACPI code for Toshiba laptop was a good starting point.

 *  Eric Burghard  - LED display support for W1N

 *  Josh Green     - Light Sens support

 *  Thomas Tuttle  - His first patch for led support was very helpfull

 *  Sam Lin        - GPS support

 */

#include <linux/autoconf.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/init.h>

#include <linux/types.h>

#include <linux/err.h>

#include <linux/proc_fs.h>

#include <linux/backlight.h>

#include <linux/fb.h>

#include <linux/leds.h>

#include <linux/platform_device.h>

#include <acpi/acpi_drivers.h>

#include <acpi/acpi_bus.h>

#include <asm/uaccess.h>

#define ASUS_LAPTOP_VERSION "0.42"

#define ASUS_HOTK_NAME          "Asus Laptop Support"

#define ASUS_HOTK_CLASS         "hotkey"

#define ASUS_HOTK_DEVICE_NAME   "Hotkey"

#define ASUS_HOTK_FILE          "asus-laptop"

#define ASUS_HOTK_PREFIX        "\\_SB.ATKD."

/*

 * Some events we use, same for all Asus

 */

#define ATKD_BR_UP       0x10

#define ATKD_BR_DOWN     0x20

#define ATKD_LCD_ON      0x33

#define ATKD_LCD_OFF     0x34

/*

 * Known bits returned by \_SB.ATKD.HWRS

 */

#define WL_HWRS     0x80

#define BT_HWRS     0x100

/*

 * Flags for hotk status

 * WL_ON and BT_ON are also used for wireless_status()

 */

#define WL_ON       0x01        //internal Wifi

#define BT_ON       0x02        //internal Bluetooth

#define MLED_ON     0x04        //mail LED

#define TLED_ON     0x08        //touchpad LED

#define RLED_ON     0x10        //Record LED

#define PLED_ON     0x20        //Phone LED

#define GLED_ON     0x40        //Gaming LED

#define LCD_ON      0x80        //LCD backlight

#define GPS_ON      0x100       //GPS

#define ASUS_LOG    ASUS_HOTK_FILE ": "

#define ASUS_ERR    KERN_ERR    ASUS_LOG

#define ASUS_WARNING    KERN_WARNING    ASUS_LOG

#define ASUS_NOTICE KERN_NOTICE ASUS_LOG

#define ASUS_INFO   KERN_INFO   ASUS_LOG

#define ASUS_DEBUG  KERN_DEBUG  ASUS_LOG

MODULE_AUTHOR("Julien Lerouge, Karol Kozimor, Corentin Chary");

MODULE_DESCRIPTION(ASUS_HOTK_NAME);

MODULE_LICENSE("GPL");

/* WAPF defines the behavior of the Fn+Fx wlan key

 * The significance of values is yet to be found, but

 * most of the time:

 * 0x0 will do nothing

 * 0x1 will allow to control the device with Fn+Fx key.

 * 0x4 will send an ACPI event (0x88) while pressing the Fn+Fx key

 * 0x5 like 0x1 or 0x4

 * So, if something doesn't work as you want, just try other values =)

 */

static uint wapf = 1;

module_param(wapf, uint, 0644);

MODULE_PARM_DESC(wapf, "WAPF value");

#define ASUS_HANDLE(object, paths...)                                   \

        static acpi_handle  object##_handle = NULL;                     \

        static char *object##_paths[] = { paths }

/* LED */

ASUS_HANDLE(mled_set, ASUS_HOTK_PREFIX "MLED");

ASUS_HANDLE(tled_set, ASUS_HOTK_PREFIX "TLED");

ASUS_HANDLE(rled_set, ASUS_HOTK_PREFIX "RLED"); /* W1JC */

ASUS_HANDLE(pled_set, ASUS_HOTK_PREFIX "PLED"); /* A7J */

ASUS_HANDLE(gled_set, ASUS_HOTK_PREFIX "GLED"); /* G1, G2 (probably) */

/* LEDD */

ASUS_HANDLE(ledd_set, ASUS_HOTK_PREFIX "SLCM");

/* Bluetooth and WLAN

 * WLED and BLED are not handled like other XLED, because in some dsdt

 * they also control the WLAN/Bluetooth device.

 */

ASUS_HANDLE(wl_switch, ASUS_HOTK_PREFIX "WLED");

ASUS_HANDLE(bt_switch, ASUS_HOTK_PREFIX "BLED");

ASUS_HANDLE(wireless_status, ASUS_HOTK_PREFIX "RSTS");  /* All new models */

/* Brightness */

ASUS_HANDLE(brightness_set, ASUS_HOTK_PREFIX "SPLV");

ASUS_HANDLE(brightness_get, ASUS_HOTK_PREFIX "GPLV");

/* Backlight */

ASUS_HANDLE(lcd_switch, "\\_SB.PCI0.SBRG.EC0._Q10",     /* All new models */

            "\\_SB.PCI0.ISA.EC0._Q10",  /* A1x */

            "\\_SB.PCI0.PX40.ECD0._Q10",        /* L3C */

            "\\_SB.PCI0.PX40.EC0.Q10",  /* M1A */

            "\\_SB.PCI0.LPCB.EC0._Q10", /* P30 */

            "\\_SB.PCI0.PX40.Q10",      /* S1x */

            "\\Q10");           /* A2x, L2D, L3D, M2E */

/* Display */

ASUS_HANDLE(display_set, ASUS_HOTK_PREFIX "SDSP");

ASUS_HANDLE(display_get, "\\_SB.PCI0.P0P1.VGA.GETD",    /*  A6B, A6K A6R A7D F3JM L4R M6R A3G

                                                           M6A M6V VX-1 V6J V6V W3Z */

            "\\_SB.PCI0.P0P2.VGA.GETD", /* A3E A4K, A4D A4L A6J A7J A8J Z71V M9V

                                           S5A M5A z33A W1Jc W2V G1 */

            "\\_SB.PCI0.P0P3.VGA.GETD", /* A6V A6Q */

            "\\_SB.PCI0.P0PA.VGA.GETD", /* A6T, A6M */

            "\\_SB.PCI0.PCI1.VGAC.NMAP",        /* L3C */

            "\\_SB.PCI0.VGA.GETD",      /* Z96F */

            "\\ACTD",           /* A2D */

            "\\ADVG",           /* A4G Z71A W1N W5A W5F M2N M3N M5N M6N S1N S5N */

            "\\DNXT",           /* P30 */

            "\\INFB",           /* A2H D1 L2D L3D L3H L2E L5D L5C M1A M2E L4L W3V */

            "\\SSTE");          /* A3F A6F A3N A3L M6N W3N W6A */

ASUS_HANDLE(ls_switch, ASUS_HOTK_PREFIX "ALSC");        /* Z71A Z71V */

ASUS_HANDLE(ls_level, ASUS_HOTK_PREFIX "ALSL"); /* Z71A Z71V */

/* GPS */

/* R2H use different handle for GPS on/off */

ASUS_HANDLE(gps_on, ASUS_HOTK_PREFIX "SDON");   /* R2H */

ASUS_HANDLE(gps_off, ASUS_HOTK_PREFIX "SDOF");  /* R2H */

ASUS_HANDLE(gps_status, ASUS_HOTK_PREFIX "GPST");

/*

 * This is the main structure, we can use it to store anything interesting

 * about the hotk device

 */

struct asus_hotk {

        char *name;             //laptop name

        struct acpi_device *device;     //the device we are in

        acpi_handle handle;     //the handle of the hotk device

        char status;            //status of the hotk, for LEDs, ...

        u32 ledd_status;        //status of the LED display

        u8 light_level;         //light sensor level

        u8 light_switch;        //light sensor switch value

        u16 event_count[128];   //count for each event TODO make this better

};

/*

 * This header is made available to allow proper configuration given model,

 * revision number , ... this info cannot go in struct asus_hotk because it is

 * available before the hotk

 */

static struct acpi_table_header *asus_info;

/* The actual device the driver binds to */

static struct asus_hotk *hotk;

/*

 * The hotkey driver declaration

 */

static const struct acpi_device_id asus_device_ids[] = {

        {"ATK0100", 0},

        {"", 0},

};

MODULE_DEVICE_TABLE(acpi, asus_device_ids);

static int asus_hotk_add(struct acpi_device *device);

static int asus_hotk_remove(struct acpi_device *device, int type);

static struct acpi_driver asus_hotk_driver = {

        .name = ASUS_HOTK_NAME,

        .class = ASUS_HOTK_CLASS,

        .ids = asus_device_ids,

        .ops = {

                .add = asus_hotk_add,

                .remove = asus_hotk_remove,

                },

};

/* The backlight device /sys/class/backlight */

static struct backlight_device *asus_backlight_device;

/*

 * The backlight class declaration

 */

static int read_brightness(struct backlight_device *bd);

static int update_bl_status(struct backlight_device *bd);

static struct backlight_ops asusbl_ops = {

        .get_brightness = read_brightness,

        .update_status = update_bl_status,

};

/* These functions actually update the LED's, and are called from a

 * workqueue. By doing this as separate work rather than when the LED

 * subsystem asks, we avoid messing with the Asus ACPI stuff during a

 * potentially bad time, such as a timer interrupt. */

static struct workqueue_struct *led_workqueue;

#define ASUS_LED(object, ledname)                                       \

        static void object##_led_set(struct led_classdev *led_cdev,     \

                                     enum led_brightness value);        \

        static void object##_led_update(struct work_struct *ignored);   \

        static int object##_led_wk;                                     \

        static DECLARE_WORK(object##_led_work, object##_led_update);    \

        static struct led_classdev object##_led = {                     \

                .name           = "asus:" ledname,                      \

                .brightness_set = object##_led_set,                     \

        }

ASUS_LED(mled, "mail");

ASUS_LED(tled, "touchpad");

ASUS_LED(rled, "record");

ASUS_LED(pled, "phone");

ASUS_LED(gled, "gaming");

/*

 * This function evaluates an ACPI method, given an int as parameter, the

 * method is searched within the scope of the handle, can be NULL. The output

 * of the method is written is output, which can also be NULL

 *

 * returns 1 if write is successful, 0 else.

 */

static int write_acpi_int(acpi_handle handle, const char *method, int val,

                          struct acpi_buffer *output)

{

        struct acpi_object_list params; //list of input parameters (an int here)

        union acpi_object in_obj;       //the only param we use

        acpi_status status;

        params.count = 1;

        params.pointer = &in_obj;

        in_obj.type = ACPI_TYPE_INTEGER;

        in_obj.integer.value = val;

        status = acpi_evaluate_object(handle, (char *)method, &params, output);

        return (status == AE_OK);

}

static int read_wireless_status(int mask)

{

        ulong status;

        acpi_status rv = AE_OK;

        if (!wireless_status_handle)

                return (hotk->status & mask) ? 1 : 0;

        rv = acpi_evaluate_integer(wireless_status_handle, NULL, NULL, &status);

        if (ACPI_FAILURE(rv))

                printk(ASUS_WARNING "Error reading Wireless status\n");

        else

                return (status & mask) ? 1 : 0;

        return (hotk->status & mask) ? 1 : 0;

}

static int read_gps_status(void)

{

        ulong status;

        acpi_status rv = AE_OK;

        rv = acpi_evaluate_integer(gps_status_handle, NULL, NULL, &status);

        if (ACPI_FAILURE(rv))

                printk(ASUS_WARNING "Error reading GPS status\n");

        else

                return status ? 1 : 0;

        return (hotk->status & GPS_ON) ? 1 : 0;

}

/* Generic LED functions */

static int read_status(int mask)

{

        /* There is a special method for both wireless devices */

        if (mask == BT_ON || mask == WL_ON)

                return read_wireless_status(mask);

        else if (mask == GPS_ON)

                return read_gps_status();

        return (hotk->status & mask) ? 1 : 0;

}

static void write_status(acpi_handle handle, int out, int mask)

{

        hotk->status = (out) ? (hotk->status | mask) : (hotk->status & ~mask);

        switch (mask) {

        case MLED_ON:

                out = !out & 0x1;

                break;

        case GLED_ON:

                out = (out & 0x1) + 1;

                break;

        case GPS_ON:

                handle = (out) ? gps_on_handle : gps_off_handle;

                out = 0x02;

                break;

        default:

                out &= 0x1;

                break;

        }

        if (handle && !write_acpi_int(handle, NULL, out, NULL))

                printk(ASUS_WARNING " write failed %x\n", mask);

}

/* /sys/class/led handlers */

#define ASUS_LED_HANDLER(object, mask)                                  \

        static void object##_led_set(struct led_classdev *led_cdev,     \

                                     enum led_brightness value)         \

        {                                                               \

                object##_led_wk = value;                                \

                queue_work(led_workqueue, &object##_led_work);          \

        }                                                               \

        static void object##_led_update(struct work_struct *ignored)    \

        {                                                               \

                int value = object##_led_wk;                            \

                write_status(object##_set_handle, value, (mask));       \

        }

ASUS_LED_HANDLER(mled, MLED_ON);

ASUS_LED_HANDLER(pled, PLED_ON);

ASUS_LED_HANDLER(rled, RLED_ON);

ASUS_LED_HANDLER(tled, TLED_ON);

ASUS_LED_HANDLER(gled, GLED_ON);

static int get_lcd_state(void)

{

        return read_status(LCD_ON);

}

static int set_lcd_state(int value)

{

        int lcd = 0;

        acpi_status status = 0;

        lcd = value ? 1 : 0;

        if (lcd == get_lcd_state())

                return 0;

        if (lcd_switch_handle) {

                status = acpi_evaluate_object(lcd_switch_handle,

                                              NULL, NULL, NULL);

                if (ACPI_FAILURE(status))

                        printk(ASUS_WARNING "Error switching LCD\n");

        }

        write_status(NULL, lcd, LCD_ON);

        return 0;

}

static void lcd_blank(int blank)

{

        struct backlight_device *bd = asus_backlight_device;

        if (bd) {

                bd->props.power = blank;

                backlight_update_status(bd);

        }

}

static int read_brightness(struct backlight_device *bd)

{

        ulong value;

        acpi_status rv = AE_OK;

        rv = acpi_evaluate_integer(brightness_get_handle, NULL, NULL, &value);

        if (ACPI_FAILURE(rv))

                printk(ASUS_WARNING "Error reading brightness\n");

        return value;

}

static int set_brightness(struct backlight_device *bd, int value)

{

        int ret = 0;

        value = (0 < value) ? ((15 < value) ? 15 : value) : 0;

        /* 0 <= value <= 15 */

        if (!write_acpi_int(brightness_set_handle, NULL, value, NULL)) {

                printk(ASUS_WARNING "Error changing brightness\n");

                ret = -EIO;

        }

        return ret;

}

static int update_bl_status(struct backlight_device *bd)

{

        int rv;

        int value = bd->props.brightness;

        rv = set_brightness(bd, value);

        if (rv)

                return rv;

        value = (bd->props.power == FB_BLANK_UNBLANK) ? 1 : 0;

        return set_lcd_state(value);

}

/*

 * Platform device handlers

 */

/*

 * We write our info in page, we begin at offset off and cannot write more

 * than count bytes. We set eof to 1 if we handle those 2 values. We return the

 * number of bytes written in page

 */

static ssize_t show_infos(struct device *dev,

                          struct device_attribute *attr, char *page)

{

        int len = 0;

        ulong temp;

        char buf[16];           //enough for all info

        acpi_status rv = AE_OK;

        /*

         * We use the easy way, we don't care of off and count, so we don't set eof

         * to 1

         */

        len += sprintf(page, ASUS_HOTK_NAME " " ASUS_LAPTOP_VERSION "\n");

        len += sprintf(page + len, "Model reference    : %s\n", hotk->name);

        /*

         * The SFUN method probably allows the original driver to get the list

         * of features supported by a given model. For now, 0x0100 or 0x0800

         * bit signifies that the laptop is equipped with a Wi-Fi MiniPCI card.

         * The significance of others is yet to be found.

         */

        rv = acpi_evaluate_integer(hotk->handle, "SFUN", NULL, &temp);

        if (!ACPI_FAILURE(rv))

                len += sprintf(page + len, "SFUN value         : 0x%04x\n",

                               (uint) temp);

        /*

         * Another value for userspace: the ASYM method returns 0x02 for

         * battery low and 0x04 for battery critical, its readings tend to be

         * more accurate than those provided by _BST.

         * Note: since not all the laptops provide this method, errors are

         * silently ignored.

         */

        rv = acpi_evaluate_integer(hotk->handle, "ASYM", NULL, &temp);

        if (!ACPI_FAILURE(rv))

                len += sprintf(page + len, "ASYM value         : 0x%04x\n",

                               (uint) temp);

        if (asus_info) {

                snprintf(buf, 16, "%d", asus_info->length);

                len += sprintf(page + len, "DSDT length        : %s\n", buf);

                snprintf(buf, 16, "%d", asus_info->checksum);

                len += sprintf(page + len, "DSDT checksum      : %s\n", buf);

                snprintf(buf, 16, "%d", asus_info->revision);

                len += sprintf(page + len, "DSDT revision      : %s\n", buf);

                snprintf(buf, 7, "%s", asus_info->oem_id);

                len += sprintf(page + len, "OEM id             : %s\n", buf);

                snprintf(buf, 9, "%s", asus_info->oem_table_id);

                len += sprintf(page + len, "OEM table id       : %s\n", buf);

                snprintf(buf, 16, "%x", asus_info->oem_revision);

                len += sprintf(page + len, "OEM revision       : 0x%s\n", buf);

                snprintf(buf, 5, "%s", asus_info->asl_compiler_id);

                len += sprintf(page + len, "ASL comp vendor id : %s\n", buf);

                snprintf(buf, 16, "%x", asus_info->asl_compiler_revision);

                len += sprintf(page + len, "ASL comp revision  : 0x%s\n", buf);

        }

        return len;

}

static int parse_arg(const char *buf, unsigned long count, int *val)

{

        if (!count)

                return 0;

        if (count > 31)

                return -EINVAL;

        if (sscanf(buf, "%i", val) != 1)

                return -EINVAL;

        return count;

}

static ssize_t store_status(const char *buf, size_t count,

                            acpi_handle handle, int mask)

{

        int rv, value;

        int out = 0;

        rv = parse_arg(buf, count, &value);

        if (rv > 0)

                out = value ? 1 : 0;

        write_status(handle, out, mask);

        return rv;

}

/*

 * LEDD display

 */

static ssize_t show_ledd(struct device *dev,

                         struct device_attribute *attr, char *buf)

{

        return sprintf(buf, "0x%08x\n", hotk->ledd_status);

}

static ssize_t store_ledd(struct device *dev, struct device_attribute *attr,

                          const char *buf, size_t count)

{

        int rv, value;

        rv = parse_arg(buf, count, &value);

        if (rv > 0) {

                if (!write_acpi_int(ledd_set_handle, NULL, value, NULL))

                        printk(ASUS_WARNING "LED display write failed\n");

                else

                        hotk->ledd_status = (u32) value;

        }

        return rv;

}

/*

 * WLAN

 */

static ssize_t show_wlan(struct device *dev,

                         struct device_attribute *attr, char *buf)

{

        return sprintf(buf, "%d\n", read_status(WL_ON));

}

static ssize_t store_wlan(struct device *dev, struct device_attribute *attr,

                          const char *buf, size_t count)

{

        return store_status(buf, count, wl_switch_handle, WL_ON);

}

/*

 * Bluetooth

 */

static ssize_t show_bluetooth(struct device *dev,

                              struct device_attribute *attr, char *buf)

{

        return sprintf(buf, "%d\n", read_status(BT_ON));

}

static ssize_t store_bluetooth(struct device *dev,

                               struct device_attribute *attr, const char *buf,

                               size_t count)

{

        return store_status(buf, count, bt_switch_handle, BT_ON);

}

/*

 * Display

 */

static void set_display(int value)

{

        /* no sanity check needed for now */

        if (!write_acpi_int(display_set_handle, NULL, value, NULL))

                printk(ASUS_WARNING "Error setting display\n");

        return;

}

static int read_display(void)

{

        ulong value = 0;

        acpi_status rv = AE_OK;

        /* In most of the case, we know how to set the display, but sometime

           we can't read it */

        if (display_get_handle) {

                rv = acpi_evaluate_integer(display_get_handle, NULL,

                                           NULL, &value);

                if (ACPI_FAILURE(rv))

                        printk(ASUS_WARNING "Error reading display status\n");

        }

        value &= 0x0F;          /* needed for some models, shouldn't hurt others */

        return value;

}

/*

 * Now, *this* one could be more user-friendly, but so far, no-one has

 * complained. The significance of bits is the same as in store_disp()

 */

static ssize_t show_disp(struct device *dev,

                         struct device_attribute *attr, char *buf)

{

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

}

/*

 * Experimental support for display switching. As of now: 1 should activate

 * the LCD output, 2 should do for CRT, 4 for TV-Out and 8 for DVI.

 * Any combination (bitwise) of these will suffice. I never actually tested 4

 * displays hooked up simultaneously, so be warned. See the acpi4asus README

 * for more info.

 */

static ssize_t store_disp(struct device *dev, struct device_attribute *attr,

                          const char *buf, size_t count)

{

        int rv, value;

        rv = parse_arg(buf, count, &value);

        if (rv > 0)

                set_display(value);

        return rv;

}

/*

 * Light Sens

 */

static void set_light_sens_switch(int value)

{

        if (!write_acpi_int(ls_switch_handle, NULL, value, NULL))

                printk(ASUS_WARNING "Error setting light sensor switch\n");

        hotk->light_switch = value;

}

static ssize_t show_lssw(struct device *dev,

                         struct device_attribute *attr, char *buf)

{

        return sprintf(buf, "%d\n", hotk->light_switch);

}

static ssize_t store_lssw(struct device *dev, struct device_attribute *attr,

                          const char *buf, size_t count)

{

        int rv, value;

        rv = parse_arg(buf, count, &value);

        if (rv > 0)

                set_light_sens_switch(value ? 1 : 0);

        return rv;

}

static void set_light_sens_level(int value)

{

        if (!write_acpi_int(ls_level_handle, NULL, value, NULL))

                printk(ASUS_WARNING "Error setting light sensor level\n");

        hotk->light_level = value;

}

static ssize_t show_lslvl(struct device *dev,

                          struct device_attribute *attr, char *buf)

{