// SPDX-License-Identifier: GPL-2.0-only
/*
 * lms283gf05.c -- support for Samsung LMS283GF05 LCD
 *
 * Copyright (c) 2009 Marek Vasut <marek.vasut@gmail.com>
 */

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

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

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

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

/* Magic sequences supplied by manufacturer, for details refer to datasheet */
static const 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 const 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(struct gpio_desc *gpiod)
{
        gpiod_set_value(gpiod, 0); /* De-asserted */
        mdelay(100);
        gpiod_set_value(gpiod, 1); /* Asserted */
        mdelay(20);
        gpiod_set_value(gpiod, 0); /* De-asserted */
        mdelay(20);
}

static void lms283gf05_toggle(struct spi_device *spi,
                                const 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;

        if (power <= LCD_POWER_REDUCED) {
                if (st->reset)
                        lms283gf05_reset(st->reset);
                lms283gf05_toggle(spi, disp_initseq, ARRAY_SIZE(disp_initseq));
        } else {
                lms283gf05_toggle(spi, disp_pdwnseq, ARRAY_SIZE(disp_pdwnseq));
                if (st->reset)
                        gpiod_set_value(st->reset, 1); /* Asserted */
        }

        return 0;
}

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

static int lms283gf05_probe(struct spi_device *spi)
{
        struct lms283gf05_state *st;
        struct lcd_device *ld;

        st = devm_kzalloc(&spi->dev, sizeof(struct lms283gf05_state),
                                GFP_KERNEL);
        if (st == NULL)
                return -ENOMEM;

        st->reset = gpiod_get_optional(&spi->dev, "reset", GPIOD_OUT_LOW);
        if (IS_ERR(st->reset))
                return PTR_ERR(st->reset);
        gpiod_set_consumer_name(st->reset, "LMS283GF05 RESET");

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

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

        spi_set_drvdata(spi, st);

        /* kick in the LCD */
        if (st->reset)
                lms283gf05_reset(st->reset);
        lms283gf05_toggle(spi, disp_initseq, ARRAY_SIZE(disp_initseq));

        return 0;
}

static struct spi_driver lms283gf05_driver = {
        .driver = {
                .name   = "lms283gf05",
        },
        .probe          = lms283gf05_probe,
};

module_spi_driver(lms283gf05_driver);

MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
MODULE_DESCRIPTION("LCD283GF05 LCD");
MODULE_LICENSE("GPL v2");