ld9040.c

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/*
 * ld9040 AMOLED LCD panel driver.
 *
 * Copyright (c) 2011 Samsung Electronics
 * Author: Donghwa Lee  <[email protected]>
 * Derived from drivers/video/backlight/s6e63m0.c
 *
 * 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.
 */

#include <linux/wait.h>
#include <linux/fb.h>
#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/spi/spi.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/lcd.h>
#include <linux/backlight.h>
#include <linux/module.h>
#include <linux/regulator/consumer.h>

#include "ld9040_gamma.h"

#define SLEEPMSEC       0x1000
#define ENDDEF          0x2000
#define DEFMASK         0xFF00
#define COMMAND_ONLY        0xFE
#define DATA_ONLY       0xFF

#define MIN_BRIGHTNESS      0
#define MAX_BRIGHTNESS      24
#define power_is_on(pwr)    ((pwr) <= FB_BLANK_NORMAL)

struct ld9040 {
    struct device           *dev;
    struct spi_device       *spi;
    unsigned int            power;
    unsigned int            current_brightness;

    struct lcd_device       *ld;
    struct backlight_device     *bd;
    struct lcd_platform_data    *lcd_pd;

    struct mutex            lock;
    bool  enabled;
};

static struct regulator_bulk_data supplies[] = {
    { .supply = "vdd3", },
    { .supply = "vci", },
};

static void ld9040_regulator_enable(struct ld9040 *lcd)
{
    int ret = 0;
    struct lcd_platform_data *pd = NULL;

    pd = lcd->lcd_pd;
    mutex_lock(&lcd->lock);
    if (!lcd->enabled) {
        ret = regulator_bulk_enable(ARRAY_SIZE(supplies), supplies);
        if (ret)
            goto out;

        lcd->enabled = true;
    }
    mdelay(pd->power_on_delay);
out:
    mutex_unlock(&lcd->lock);
}

static void ld9040_regulator_disable(struct ld9040 *lcd)
{
    int ret = 0;

    mutex_lock(&lcd->lock);
    if (lcd->enabled) {
        ret = regulator_bulk_disable(ARRAY_SIZE(supplies), supplies);
        if (ret)
            goto out;

        lcd->enabled = false;
    }
out:
    mutex_unlock(&lcd->lock);
}

static const unsigned short seq_swreset[] = {
    0x01, COMMAND_ONLY,
    ENDDEF, 0x00
};

static const unsigned short seq_user_setting[] = {
    0xF0, 0x5A,

    DATA_ONLY, 0x5A,
    ENDDEF, 0x00
};

static const unsigned short seq_elvss_on[] = {
    0xB1, 0x0D,

    DATA_ONLY, 0x00,
    DATA_ONLY, 0x16,
    ENDDEF, 0x00
};

static const unsigned short seq_gtcon[] = {
    0xF7, 0x09,

    DATA_ONLY, 0x00,
    DATA_ONLY, 0x00,
    ENDDEF, 0x00
};

static const unsigned short seq_panel_condition[] = {
    0xF8, 0x05,

    DATA_ONLY, 0x65,
    DATA_ONLY, 0x96,
    DATA_ONLY, 0x71,
    DATA_ONLY, 0x7D,
    DATA_ONLY, 0x19,
    DATA_ONLY, 0x3B,
    DATA_ONLY, 0x0D,
    DATA_ONLY, 0x19,
    DATA_ONLY, 0x7E,
    DATA_ONLY, 0x0D,
    DATA_ONLY, 0xE2,
    DATA_ONLY, 0x00,
    DATA_ONLY, 0x00,
    DATA_ONLY, 0x7E,
    DATA_ONLY, 0x7D,
    DATA_ONLY, 0x07,
    DATA_ONLY, 0x07,
    DATA_ONLY, 0x20,
    DATA_ONLY, 0x20,
    DATA_ONLY, 0x20,
    DATA_ONLY, 0x02,
    DATA_ONLY, 0x02,
    ENDDEF, 0x00
};

static const unsigned short seq_gamma_set1[] = {
    0xF9, 0x00,

    DATA_ONLY, 0xA7,
    DATA_ONLY, 0xB4,
    DATA_ONLY, 0xAE,
    DATA_ONLY, 0xBF,
    DATA_ONLY, 0x00,
    DATA_ONLY, 0x91,
    DATA_ONLY, 0x00,
    DATA_ONLY, 0xB2,
    DATA_ONLY, 0xB4,
    DATA_ONLY, 0xAA,
    DATA_ONLY, 0xBB,
    DATA_ONLY, 0x00,
    DATA_ONLY, 0xAC,
    DATA_ONLY, 0x00,
    DATA_ONLY, 0xB3,
    DATA_ONLY, 0xB1,
    DATA_ONLY, 0xAA,
    DATA_ONLY, 0xBC,
    DATA_ONLY, 0x00,
    DATA_ONLY, 0xB3,
    ENDDEF, 0x00
};

static const unsigned short seq_gamma_ctrl[] = {
    0xFB, 0x02,

    DATA_ONLY, 0x5A,
    ENDDEF, 0x00
};

static const unsigned short seq_gamma_start[] = {
    0xF9, COMMAND_ONLY,

    ENDDEF, 0x00
};

static const unsigned short seq_apon[] = {
    0xF3, 0x00,

    DATA_ONLY, 0x00,
    DATA_ONLY, 0x00,
    DATA_ONLY, 0x0A,
    DATA_ONLY, 0x02,
    ENDDEF, 0x00
};

static const unsigned short seq_display_ctrl[] = {
    0xF2, 0x02,

    DATA_ONLY, 0x08,
    DATA_ONLY, 0x08,
    DATA_ONLY, 0x10,
    DATA_ONLY, 0x10,
    ENDDEF, 0x00
};

static const unsigned short seq_manual_pwr[] = {
    0xB0, 0x04,
    ENDDEF, 0x00
};

static const unsigned short seq_pwr_ctrl[] = {
    0xF4, 0x0A,

    DATA_ONLY, 0x87,
    DATA_ONLY, 0x25,
    DATA_ONLY, 0x6A,
    DATA_ONLY, 0x44,
    DATA_ONLY, 0x02,
    DATA_ONLY, 0x88,
    ENDDEF, 0x00
};

static const unsigned short seq_sleep_out[] = {
    0x11, COMMAND_ONLY,
    ENDDEF, 0x00
};

static const unsigned short seq_sleep_in[] = {
    0x10, COMMAND_ONLY,
    ENDDEF, 0x00
};

static const unsigned short seq_display_on[] = {
    0x29, COMMAND_ONLY,
    ENDDEF, 0x00
};

static const unsigned short seq_display_off[] = {
    0x28, COMMAND_ONLY,
    ENDDEF, 0x00
};

static const unsigned short seq_vci1_1st_en[] = {
    0xF3, 0x10,

    DATA_ONLY, 0x00,
    DATA_ONLY, 0x00,
    DATA_ONLY, 0x00,
    DATA_ONLY, 0x02,
    ENDDEF, 0x00
};

static const unsigned short seq_vl1_en[] = {
    0xF3, 0x11,

    DATA_ONLY, 0x00,
    DATA_ONLY, 0x00,
    DATA_ONLY, 0x00,
    DATA_ONLY, 0x02,
    ENDDEF, 0x00
};

static const unsigned short seq_vl2_en[] = {
    0xF3, 0x13,

    DATA_ONLY, 0x00,
    DATA_ONLY, 0x00,
    DATA_ONLY, 0x00,
    DATA_ONLY, 0x02,
    ENDDEF, 0x00
};

static const unsigned short seq_vci1_2nd_en[] = {
    0xF3, 0x33,

    DATA_ONLY, 0x00,
    DATA_ONLY, 0x00,
    DATA_ONLY, 0x00,
    DATA_ONLY, 0x02,
    ENDDEF, 0x00
};

static const unsigned short seq_vl3_en[] = {
    0xF3, 0x37,

    DATA_ONLY, 0x00,
    DATA_ONLY, 0x00,
    DATA_ONLY, 0x00,
    DATA_ONLY, 0x02,
    ENDDEF, 0x00
};

static const unsigned short seq_vreg1_amp_en[] = {
    0xF3, 0x37,

    DATA_ONLY, 0x01,
    DATA_ONLY, 0x00,
    DATA_ONLY, 0x00,
    DATA_ONLY, 0x02,
    ENDDEF, 0x00
};

static const unsigned short seq_vgh_amp_en[] = {
    0xF3, 0x37,

    DATA_ONLY, 0x11,
    DATA_ONLY, 0x00,
    DATA_ONLY, 0x00,
    DATA_ONLY, 0x02,
    ENDDEF, 0x00
};

static const unsigned short seq_vgl_amp_en[] = {
    0xF3, 0x37,

    DATA_ONLY, 0x31,
    DATA_ONLY, 0x00,
    DATA_ONLY, 0x00,
    DATA_ONLY, 0x02,
    ENDDEF, 0x00
};

static const unsigned short seq_vmos_amp_en[] = {
    0xF3, 0x37,

    DATA_ONLY, 0xB1,
    DATA_ONLY, 0x00,
    DATA_ONLY, 0x00,
    DATA_ONLY, 0x03,
    ENDDEF, 0x00
};

static const unsigned short seq_vint_amp_en[] = {
    0xF3, 0x37,

    DATA_ONLY, 0xF1,
    /* DATA_ONLY, 0x71, VMOS/VBL/VBH not used */
    DATA_ONLY, 0x00,
    DATA_ONLY, 0x00,
    DATA_ONLY, 0x03,
    /* DATA_ONLY, 0x02, VMOS/VBL/VBH not used */
    ENDDEF, 0x00
};

static const unsigned short seq_vbh_amp_en[] = {
    0xF3, 0x37,

    DATA_ONLY, 0xF9,
    DATA_ONLY, 0x00,
    DATA_ONLY, 0x00,
    DATA_ONLY, 0x03,
    ENDDEF, 0x00
};

static const unsigned short seq_vbl_amp_en[] = {
    0xF3, 0x37,

    DATA_ONLY, 0xFD,
    DATA_ONLY, 0x00,
    DATA_ONLY, 0x00,
    DATA_ONLY, 0x03,
    ENDDEF, 0x00
};

static const unsigned short seq_gam_amp_en[] = {
    0xF3, 0x37,

    DATA_ONLY, 0xFF,
    /* DATA_ONLY, 0x73, VMOS/VBL/VBH not used */
    DATA_ONLY, 0x00,
    DATA_ONLY, 0x00,
    DATA_ONLY, 0x03,
    /* DATA_ONLY, 0x02, VMOS/VBL/VBH not used */
    ENDDEF, 0x00
};

static const unsigned short seq_sd_amp_en[] = {
    0xF3, 0x37,

    DATA_ONLY, 0xFF,
    /* DATA_ONLY, 0x73, VMOS/VBL/VBH not used */
    DATA_ONLY, 0x80,
    DATA_ONLY, 0x00,
    DATA_ONLY, 0x03,
    /* DATA_ONLY, 0x02, VMOS/VBL/VBH not used */
    ENDDEF, 0x00
};

static const unsigned short seq_gls_en[] = {
    0xF3, 0x37,

    DATA_ONLY, 0xFF,
    /* DATA_ONLY, 0x73, VMOS/VBL/VBH not used */
    DATA_ONLY, 0x81,
    DATA_ONLY, 0x00,
    DATA_ONLY, 0x03,
    /* DATA_ONLY, 0x02, VMOS/VBL/VBH not used */
    ENDDEF, 0x00
};

static const unsigned short seq_els_en[] = {
    0xF3, 0x37,

    DATA_ONLY, 0xFF,
    /* DATA_ONLY, 0x73, VMOS/VBL/VBH not used */
    DATA_ONLY, 0x83,
    DATA_ONLY, 0x00,
    DATA_ONLY, 0x03,
    /* DATA_ONLY, 0x02, VMOS/VBL/VBH not used */
    ENDDEF, 0x00
};

static const unsigned short seq_el_on[] = {
    0xF3, 0x37,

    DATA_ONLY, 0xFF,
    /* DATA_ONLY, 0x73, VMOS/VBL/VBH not used */
    DATA_ONLY, 0x87,
    DATA_ONLY, 0x00,
    DATA_ONLY, 0x03,
    /* DATA_ONLY, 0x02, VMOS/VBL/VBH not used */
    ENDDEF, 0x00
};

static int ld9040_spi_write_byte(struct ld9040 *lcd, int addr, int data)
{
    u16 buf[1];
    struct spi_message msg;

    struct spi_transfer xfer = {
        .len        = 2,
        .tx_buf     = buf,
    };

    buf[0] = (addr << 8) | data;

    spi_message_init(&msg);
    spi_message_add_tail(&xfer, &msg);

    return spi_sync(lcd->spi, &msg);
}

static int ld9040_spi_write(struct ld9040 *lcd, unsigned char address,
    unsigned char command)
{
    int ret = 0;

    if (address != DATA_ONLY)
        ret = ld9040_spi_write_byte(lcd, 0x0, address);
    if (command != COMMAND_ONLY)
        ret = ld9040_spi_write_byte(lcd, 0x1, command);

    return ret;
}

static int ld9040_panel_send_sequence(struct ld9040 *lcd,
    const unsigned short *wbuf)
{
    int ret = 0, i = 0;

    while ((wbuf[i] & DEFMASK) != ENDDEF) {
        if ((wbuf[i] & DEFMASK) != SLEEPMSEC) {
            ret = ld9040_spi_write(lcd, wbuf[i], wbuf[i+1]);
            if (ret)
                break;
        } else
            udelay(wbuf[i+1]*1000);
        i += 2;
    }

    return ret;
}

static int _ld9040_gamma_ctl(struct ld9040 *lcd, const unsigned int *gamma)
{
    unsigned int i = 0;
    int ret = 0;

    /* start gamma table updating. */
    ret = ld9040_panel_send_sequence(lcd, seq_gamma_start);
    if (ret) {
        dev_err(lcd->dev, "failed to disable gamma table updating.\n");
        goto gamma_err;
    }

    for (i = 0 ; i < GAMMA_TABLE_COUNT; i++) {
        ret = ld9040_spi_write(lcd, DATA_ONLY, gamma[i]);
        if (ret) {
            dev_err(lcd->dev, "failed to set gamma table.\n");
            goto gamma_err;
        }
    }

    /* update gamma table. */
    ret = ld9040_panel_send_sequence(lcd, seq_gamma_ctrl);
    if (ret)
        dev_err(lcd->dev, "failed to update gamma table.\n");

gamma_err:
    return ret;
}

static int ld9040_gamma_ctl(struct ld9040 *lcd, int gamma)
{
    int ret = 0;

    ret = _ld9040_gamma_ctl(lcd, gamma_table.gamma_22_table[gamma]);

    return ret;
}


static int ld9040_ldi_init(struct ld9040 *lcd)
{
    int ret, i;
    static const unsigned short *init_seq[] = {
        seq_user_setting,
        seq_panel_condition,
        seq_display_ctrl,
        seq_manual_pwr,
        seq_elvss_on,
        seq_gtcon,
        seq_gamma_set1,
        seq_gamma_ctrl,
        seq_sleep_out,
    };

    for (i = 0; i < ARRAY_SIZE(init_seq); i++) {
        ret = ld9040_panel_send_sequence(lcd, init_seq[i]);
        /* workaround: minimum delay time for transferring CMD */
        udelay(300);
        if (ret)
            break;
    }

    return ret;
}

static int ld9040_ldi_enable(struct ld9040 *lcd)
{
    int ret = 0;

    ret = ld9040_panel_send_sequence(lcd, seq_display_on);

    return ret;
}

static int ld9040_ldi_disable(struct ld9040 *lcd)
{
    int ret;

    ret = ld9040_panel_send_sequence(lcd, seq_display_off);
    ret = ld9040_panel_send_sequence(lcd, seq_sleep_in);

    return ret;
}

static int ld9040_power_on(struct ld9040 *lcd)
{
    int ret = 0;
    struct lcd_platform_data *pd = NULL;
    pd = lcd->lcd_pd;
    if (!pd) {
        dev_err(lcd->dev, "platform data is NULL.\n");
        return -EFAULT;
    }

    /* lcd power on */
    ld9040_regulator_enable(lcd);

    if (!pd->reset) {
        dev_err(lcd->dev, "reset is NULL.\n");
        return -EFAULT;
    } else {
        pd->reset(lcd->ld);
        mdelay(pd->reset_delay);
    }

    ret = ld9040_ldi_init(lcd);
    if (ret) {
        dev_err(lcd->dev, "failed to initialize ldi.\n");
        return ret;
    }

    ret = ld9040_ldi_enable(lcd);
    if (ret) {
        dev_err(lcd->dev, "failed to enable ldi.\n");
        return ret;
    }

    return 0;
}

static int ld9040_power_off(struct ld9040 *lcd)
{
    int ret = 0;
    struct lcd_platform_data *pd = NULL;

    pd = lcd->lcd_pd;
    if (!pd) {
        dev_err(lcd->dev, "platform data is NULL.\n");
        return -EFAULT;
    }

    ret = ld9040_ldi_disable(lcd);
    if (ret) {
        dev_err(lcd->dev, "lcd setting failed.\n");
        return -EIO;
    }

    mdelay(pd->power_off_delay);

    /* lcd power off */
    ld9040_regulator_disable(lcd);

    return 0;
}

static int ld9040_power(struct ld9040 *lcd, int power)
{
    int ret = 0;

    if (power_is_on(power) && !power_is_on(lcd->power))
        ret = ld9040_power_on(lcd);
    else if (!power_is_on(power) && power_is_on(lcd->power))
        ret = ld9040_power_off(lcd);

    if (!ret)
        lcd->power = power;

    return ret;
}

static int ld9040_set_power(struct lcd_device *ld, int power)
{
    struct ld9040 *lcd = lcd_get_data(ld);

    if (power != FB_BLANK_UNBLANK && power != FB_BLANK_POWERDOWN &&
        power != FB_BLANK_NORMAL) {
        dev_err(lcd->dev, "power value should be 0, 1 or 4.\n");
        return -EINVAL;
    }

    return ld9040_power(lcd, power);
}

static int ld9040_get_power(struct lcd_device *ld)
{
    struct ld9040 *lcd = lcd_get_data(ld);

    return lcd->power;
}

static int ld9040_get_brightness(struct backlight_device *bd)
{
    return bd->props.brightness;
}

static int ld9040_set_brightness(struct backlight_device *bd)
{
    int ret = 0, brightness = bd->props.brightness;
    struct ld9040 *lcd = bl_get_data(bd);

    if (brightness < MIN_BRIGHTNESS ||
        brightness > bd->props.max_brightness) {
        dev_err(&bd->dev, "lcd brightness should be %d to %d.\n",
            MIN_BRIGHTNESS, MAX_BRIGHTNESS);
        return -EINVAL;
    }

    ret = ld9040_gamma_ctl(lcd, bd->props.brightness);
    if (ret) {
        dev_err(&bd->dev, "lcd brightness setting failed.\n");
        return -EIO;
    }

    return ret;
}

static struct lcd_ops ld9040_lcd_ops = {
    .set_power = ld9040_set_power,
    .get_power = ld9040_get_power,
};

static const struct backlight_ops ld9040_backlight_ops  = {
    .get_brightness = ld9040_get_brightness,
    .update_status = ld9040_set_brightness,
};


static int ld9040_probe(struct spi_device *spi)
{
    int ret = 0;
    struct ld9040 *lcd = NULL;
    struct lcd_device *ld = NULL;
    struct backlight_device *bd = NULL;
    struct backlight_properties props;

    lcd = devm_kzalloc(&spi->dev, sizeof(struct ld9040), GFP_KERNEL);
    if (!lcd)
        return -ENOMEM;

    /* ld9040 lcd panel uses 3-wire 9bits SPI Mode. */
    spi->bits_per_word = 9;

    ret = spi_setup(spi);
    if (ret < 0) {
        dev_err(&spi->dev, "spi setup failed.\n");
        return ret;
    }

    lcd->spi = spi;
    lcd->dev = &spi->dev;

    lcd->lcd_pd = spi->dev.platform_data;
    if (!lcd->lcd_pd) {
        dev_err(&spi->dev, "platform data is NULL.\n");
        return -EFAULT;
    }

    mutex_init(&lcd->lock);

    ret = regulator_bulk_get(lcd->dev, ARRAY_SIZE(supplies), supplies);
    if (ret) {
        dev_err(lcd->dev, "Failed to get regulators: %d\n", ret);
        return ret;
    }

    ld = lcd_device_register("ld9040", &spi->dev, lcd, &ld9040_lcd_ops);
    if (IS_ERR(ld)) {
        ret = PTR_ERR(ld);
        goto out_free_regulator;
    }

    lcd->ld = ld;

    memset(&props, 0, sizeof(struct backlight_properties));
    props.type = BACKLIGHT_RAW;
    props.max_brightness = MAX_BRIGHTNESS;

    bd = backlight_device_register("ld9040-bl", &spi->dev,
        lcd, &ld9040_backlight_ops, &props);
    if (IS_ERR(bd)) {
        ret = PTR_ERR(bd);
        goto out_unregister_lcd;
    }

    bd->props.brightness = MAX_BRIGHTNESS;
    lcd->bd = bd;

    /*
     * if lcd panel was on from bootloader like u-boot then
     * do not lcd on.
     */
    if (!lcd->lcd_pd->lcd_enabled) {
        /*
         * if lcd panel was off from bootloader then
         * current lcd status is powerdown and then
         * it enables lcd panel.
         */
        lcd->power = FB_BLANK_POWERDOWN;

        ld9040_power(lcd, FB_BLANK_UNBLANK);
    } else
        lcd->power = FB_BLANK_UNBLANK;

    dev_set_drvdata(&spi->dev, lcd);

    dev_info(&spi->dev, "ld9040 panel driver has been probed.\n");
    return 0;

out_unregister_lcd:
    lcd_device_unregister(lcd->ld);
out_free_regulator:
    regulator_bulk_free(ARRAY_SIZE(supplies), supplies);

    return ret;
}

static int __devexit ld9040_remove(struct spi_device *spi)
{
    struct ld9040 *lcd = dev_get_drvdata(&spi->dev);

    ld9040_power(lcd, FB_BLANK_POWERDOWN);
    backlight_device_unregister(lcd->bd);
    lcd_device_unregister(lcd->ld);
    regulator_bulk_free(ARRAY_SIZE(supplies), supplies);

    return 0;
}

#if defined(CONFIG_PM)
static int ld9040_suspend(struct spi_device *spi, pm_message_t mesg)
{
    int ret = 0;
    struct ld9040 *lcd = dev_get_drvdata(&spi->dev);

    dev_dbg(&spi->dev, "lcd->power = %d\n", lcd->power);

    /*
     * when lcd panel is suspend, lcd panel becomes off
     * regardless of status.
     */
    ret = ld9040_power(lcd, FB_BLANK_POWERDOWN);

    return ret;
}

static int ld9040_resume(struct spi_device *spi)
{
    int ret = 0;
    struct ld9040 *lcd = dev_get_drvdata(&spi->dev);

    lcd->power = FB_BLANK_POWERDOWN;

    ret = ld9040_power(lcd, FB_BLANK_UNBLANK);

    return ret;
}
#else
#define ld9040_suspend      NULL
#define ld9040_resume       NULL
#endif

/* Power down all displays on reboot, poweroff or halt. */
static void ld9040_shutdown(struct spi_device *spi)
{
    struct ld9040 *lcd = dev_get_drvdata(&spi->dev);

    ld9040_power(lcd, FB_BLANK_POWERDOWN);
}

static struct spi_driver ld9040_driver = {
    .driver = {
        .name   = "ld9040",
        .owner  = THIS_MODULE,
    },
    .probe      = ld9040_probe,
    .remove     = __devexit_p(ld9040_remove),
    .shutdown   = ld9040_shutdown,
    .suspend    = ld9040_suspend,
    .resume     = ld9040_resume,
};

module_spi_driver(ld9040_driver);

MODULE_AUTHOR("Donghwa Lee <[email protected]>");
MODULE_DESCRIPTION("ld9040 LCD Driver");
MODULE_LICENSE("GPL");