lms283gf05.c

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/*
 * lms283gf05.c -- support for Samsung LMS283GF05 LCD
 *
 * Copyright (c) 2009 Marek Vasut <[email protected]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/gpio.h>
#include <linux/lcd.h>

#include <linux/spi/spi.h>
#include <linux/spi/lms283gf05.h>
#include <linux/module.h>

struct lms283gf05_state {
    struct spi_device   *spi;
    struct lcd_device   *ld;
};

struct lms283gf05_seq {
    unsigned char       reg;
    unsigned short      value;
    unsigned char       delay;
};

/* Magic sequences supplied by manufacturer, for details refer to datasheet */
static struct lms283gf05_seq disp_initseq[] = {
    /* REG, VALUE, DELAY */
    { 0x07, 0x0000, 0 },
    { 0x13, 0x0000, 10 },

    { 0x11, 0x3004, 0 },
    { 0x14, 0x200F, 0 },
    { 0x10, 0x1a20, 0 },
    { 0x13, 0x0040, 50 },

    { 0x13, 0x0060, 0 },
    { 0x13, 0x0070, 200 },

    { 0x01, 0x0127, 0 },
    { 0x02, 0x0700, 0 },
    { 0x03, 0x1030, 0 },
    { 0x08, 0x0208, 0 },
    { 0x0B, 0x0620, 0 },
    { 0x0C, 0x0110, 0 },
    { 0x30, 0x0120, 0 },
    { 0x31, 0x0127, 0 },
    { 0x32, 0x0000, 0 },
    { 0x33, 0x0503, 0 },
    { 0x34, 0x0727, 0 },
    { 0x35, 0x0124, 0 },
    { 0x36, 0x0706, 0 },
    { 0x37, 0x0701, 0 },
    { 0x38, 0x0F00, 0 },
    { 0x39, 0x0F00, 0 },
    { 0x40, 0x0000, 0 },
    { 0x41, 0x0000, 0 },
    { 0x42, 0x013f, 0 },
    { 0x43, 0x0000, 0 },
    { 0x44, 0x013f, 0 },
    { 0x45, 0x0000, 0 },
    { 0x46, 0xef00, 0 },
    { 0x47, 0x013f, 0 },
    { 0x48, 0x0000, 0 },
    { 0x07, 0x0015, 30 },

    { 0x07, 0x0017, 0 },

    { 0x20, 0x0000, 0 },
    { 0x21, 0x0000, 0 },
    { 0x22, 0x0000, 0 }
};

static struct lms283gf05_seq disp_pdwnseq[] = {
    { 0x07, 0x0016, 30 },

    { 0x07, 0x0004, 0 },
    { 0x10, 0x0220, 20 },

    { 0x13, 0x0060, 50 },

    { 0x13, 0x0040, 50 },

    { 0x13, 0x0000, 0 },
    { 0x10, 0x0000, 0 }
};


static void lms283gf05_reset(unsigned long gpio, bool inverted)
{
    gpio_set_value(gpio, !inverted);
    mdelay(100);
    gpio_set_value(gpio, inverted);
    mdelay(20);
    gpio_set_value(gpio, !inverted);
    mdelay(20);
}

static void lms283gf05_toggle(struct spi_device *spi,
            struct lms283gf05_seq *seq, int sz)
{
    char buf[3];
    int i;

    for (i = 0; i < sz; i++) {
        buf[0] = 0x74;
        buf[1] = 0x00;
        buf[2] = seq[i].reg;
        spi_write(spi, buf, 3);

        buf[0] = 0x76;
        buf[1] = seq[i].value >> 8;
        buf[2] = seq[i].value & 0xff;
        spi_write(spi, buf, 3);

        mdelay(seq[i].delay);
    }
}

static int lms283gf05_power_set(struct lcd_device *ld, int power)
{
    struct lms283gf05_state *st = lcd_get_data(ld);
    struct spi_device *spi = st->spi;
    struct lms283gf05_pdata *pdata = spi->dev.platform_data;

    if (power <= FB_BLANK_NORMAL) {
        if (pdata)
            lms283gf05_reset(pdata->reset_gpio,
                    pdata->reset_inverted);
        lms283gf05_toggle(spi, disp_initseq, ARRAY_SIZE(disp_initseq));
    } else {
        lms283gf05_toggle(spi, disp_pdwnseq, ARRAY_SIZE(disp_pdwnseq));
        if (pdata)
            gpio_set_value(pdata->reset_gpio,
                    pdata->reset_inverted);
    }

    return 0;
}

static struct lcd_ops lms_ops = {
    .set_power  = lms283gf05_power_set,
    .get_power  = NULL,
};

static int __devinit lms283gf05_probe(struct spi_device *spi)
{
    struct lms283gf05_state *st;
    struct lms283gf05_pdata *pdata = spi->dev.platform_data;
    struct lcd_device *ld;
    int ret = 0;

    if (pdata != NULL) {
        ret = devm_gpio_request(&spi->dev, pdata->reset_gpio,
                    "LMS285GF05 RESET");
        if (ret)
            return ret;

        ret = gpio_direction_output(pdata->reset_gpio,
                        !pdata->reset_inverted);
        if (ret)
            return ret;
    }

    st = devm_kzalloc(&spi->dev, sizeof(struct lms283gf05_state),
                GFP_KERNEL);
    if (st == NULL) {
        dev_err(&spi->dev, "No memory for device state\n");
        return -ENOMEM;
    }

    ld = lcd_device_register("lms283gf05", &spi->dev, st, &lms_ops);
    if (IS_ERR(ld))
        return PTR_ERR(ld);

    st->spi = spi;
    st->ld = ld;

    dev_set_drvdata(&spi->dev, st);

    /* kick in the LCD */
    if (pdata)
        lms283gf05_reset(pdata->reset_gpio, pdata->reset_inverted);
    lms283gf05_toggle(spi, disp_initseq, ARRAY_SIZE(disp_initseq));

    return 0;
}

static int __devexit lms283gf05_remove(struct spi_device *spi)
{
    struct lms283gf05_state *st = dev_get_drvdata(&spi->dev);

    lcd_device_unregister(st->ld);

    return 0;
}

static struct spi_driver lms283gf05_driver = {
    .driver = {
        .name   = "lms283gf05",
        .owner  = THIS_MODULE,
    },
    .probe      = lms283gf05_probe,
    .remove     = __devexit_p(lms283gf05_remove),
};

module_spi_driver(lms283gf05_driver);

MODULE_AUTHOR("Marek Vasut <[email protected]>");
MODULE_DESCRIPTION("LCD283GF05 LCD");
MODULE_LICENSE("GPL v2");