// 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 */
{ 0 x07, 0 x0000, 0 },
{ 0 x13, 0 x0000, 10 },
{ 0 x11, 0 x3004, 0 },
{ 0 x14, 0 x200F, 0 },
{ 0 x10, 0 x1a20, 0 },
{ 0 x13, 0 x0040, 50 },
{ 0 x13, 0 x0060, 0 },
{ 0 x13, 0 x0070, 200 },
{ 0 x01, 0 x0127, 0 },
{ 0 x02, 0 x0700, 0 },
{ 0 x03, 0 x1030, 0 },
{ 0 x08, 0 x0208, 0 },
{ 0 x0B, 0 x0620, 0 },
{ 0 x0C, 0 x0110, 0 },
{ 0 x30, 0 x0120, 0 },
{ 0 x31, 0 x0127, 0 },
{ 0 x32, 0 x0000, 0 },
{ 0 x33, 0 x0503, 0 },
{ 0 x34, 0 x0727, 0 },
{ 0 x35, 0 x0124, 0 },
{ 0 x36, 0 x0706, 0 },
{ 0 x37, 0 x0701, 0 },
{ 0 x38, 0 x0F00, 0 },
{ 0 x39, 0 x0F00, 0 },
{ 0 x40, 0 x0000, 0 },
{ 0 x41, 0 x0000, 0 },
{ 0 x42, 0 x013f, 0 },
{ 0 x43, 0 x0000, 0 },
{ 0 x44, 0 x013f, 0 },
{ 0 x45, 0 x0000, 0 },
{ 0 x46, 0 xef00, 0 },
{ 0 x47, 0 x013f, 0 },
{ 0 x48, 0 x0000, 0 },
{ 0 x07, 0 x0015, 30 },
{ 0 x07, 0 x0017, 0 },
{ 0 x20, 0 x0000, 0 },
{ 0 x21, 0 x0000, 0 },
{ 0 x22, 0 x0000, 0 }
};
static const struct lms283gf05_seq disp_pdwnseq[] = {
{ 0 x07, 0 x0016, 30 },
{ 0 x07, 0 x0004, 0 },
{ 0 x10, 0 x0220, 20 },
{ 0 x13, 0 x0060, 50 },
{ 0 x13, 0 x0040, 50 },
{ 0 x13, 0 x0000, 0 },
{ 0 x10, 0 x0000, 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 ] = 0 x74;
buf[1 ] = 0 x00;
buf[2 ] = seq[i].reg;
spi_write(spi, buf, 3 );
buf[0 ] = 0 x76;
buf[1 ] = seq[i].value >> 8 ;
buf[2 ] = seq[i].value & 0 xff;
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" );
Messung V0.5 in Prozent C=96 H=92 G=93
¤ Dauer der Verarbeitung: 0.10 Sekunden
(vorverarbeitet am 2026-06-07)
¤
*© Formatika GbR, Deutschland