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// 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");
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