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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * lms283gf05.c -- support for Samsung LMS283GF05 LCD4 *5 * Copyright (c) 2009 Marek Vasut <marek.vasut@gmail.com>6 */7 8#include <linux/device.h>9#include <linux/kernel.h>10#include <linux/delay.h>11#include <linux/slab.h>12#include <linux/gpio/consumer.h>13#include <linux/lcd.h>14 15#include <linux/spi/spi.h>16#include <linux/module.h>17 18struct lms283gf05_state {19 struct spi_device *spi;20 struct lcd_device *ld;21 struct gpio_desc *reset;22};23 24struct lms283gf05_seq {25 unsigned char reg;26 unsigned short value;27 unsigned char delay;28};29 30/* Magic sequences supplied by manufacturer, for details refer to datasheet */31static const struct lms283gf05_seq disp_initseq[] = {32 /* REG, VALUE, DELAY */33 { 0x07, 0x0000, 0 },34 { 0x13, 0x0000, 10 },35 36 { 0x11, 0x3004, 0 },37 { 0x14, 0x200F, 0 },38 { 0x10, 0x1a20, 0 },39 { 0x13, 0x0040, 50 },40 41 { 0x13, 0x0060, 0 },42 { 0x13, 0x0070, 200 },43 44 { 0x01, 0x0127, 0 },45 { 0x02, 0x0700, 0 },46 { 0x03, 0x1030, 0 },47 { 0x08, 0x0208, 0 },48 { 0x0B, 0x0620, 0 },49 { 0x0C, 0x0110, 0 },50 { 0x30, 0x0120, 0 },51 { 0x31, 0x0127, 0 },52 { 0x32, 0x0000, 0 },53 { 0x33, 0x0503, 0 },54 { 0x34, 0x0727, 0 },55 { 0x35, 0x0124, 0 },56 { 0x36, 0x0706, 0 },57 { 0x37, 0x0701, 0 },58 { 0x38, 0x0F00, 0 },59 { 0x39, 0x0F00, 0 },60 { 0x40, 0x0000, 0 },61 { 0x41, 0x0000, 0 },62 { 0x42, 0x013f, 0 },63 { 0x43, 0x0000, 0 },64 { 0x44, 0x013f, 0 },65 { 0x45, 0x0000, 0 },66 { 0x46, 0xef00, 0 },67 { 0x47, 0x013f, 0 },68 { 0x48, 0x0000, 0 },69 { 0x07, 0x0015, 30 },70 71 { 0x07, 0x0017, 0 },72 73 { 0x20, 0x0000, 0 },74 { 0x21, 0x0000, 0 },75 { 0x22, 0x0000, 0 }76};77 78static const struct lms283gf05_seq disp_pdwnseq[] = {79 { 0x07, 0x0016, 30 },80 81 { 0x07, 0x0004, 0 },82 { 0x10, 0x0220, 20 },83 84 { 0x13, 0x0060, 50 },85 86 { 0x13, 0x0040, 50 },87 88 { 0x13, 0x0000, 0 },89 { 0x10, 0x0000, 0 }90};91 92 93static void lms283gf05_reset(struct gpio_desc *gpiod)94{95 gpiod_set_value(gpiod, 0); /* De-asserted */96 mdelay(100);97 gpiod_set_value(gpiod, 1); /* Asserted */98 mdelay(20);99 gpiod_set_value(gpiod, 0); /* De-asserted */100 mdelay(20);101}102 103static void lms283gf05_toggle(struct spi_device *spi,104 const struct lms283gf05_seq *seq, int sz)105{106 char buf[3];107 int i;108 109 for (i = 0; i < sz; i++) {110 buf[0] = 0x74;111 buf[1] = 0x00;112 buf[2] = seq[i].reg;113 spi_write(spi, buf, 3);114 115 buf[0] = 0x76;116 buf[1] = seq[i].value >> 8;117 buf[2] = seq[i].value & 0xff;118 spi_write(spi, buf, 3);119 120 mdelay(seq[i].delay);121 }122}123 124static int lms283gf05_power_set(struct lcd_device *ld, int power)125{126 struct lms283gf05_state *st = lcd_get_data(ld);127 struct spi_device *spi = st->spi;128 129 if (power <= FB_BLANK_NORMAL) {130 if (st->reset)131 lms283gf05_reset(st->reset);132 lms283gf05_toggle(spi, disp_initseq, ARRAY_SIZE(disp_initseq));133 } else {134 lms283gf05_toggle(spi, disp_pdwnseq, ARRAY_SIZE(disp_pdwnseq));135 if (st->reset)136 gpiod_set_value(st->reset, 1); /* Asserted */137 }138 139 return 0;140}141 142static const struct lcd_ops lms_ops = {143 .set_power = lms283gf05_power_set,144 .get_power = NULL,145};146 147static int lms283gf05_probe(struct spi_device *spi)148{149 struct lms283gf05_state *st;150 struct lcd_device *ld;151 152 st = devm_kzalloc(&spi->dev, sizeof(struct lms283gf05_state),153 GFP_KERNEL);154 if (st == NULL)155 return -ENOMEM;156 157 st->reset = gpiod_get_optional(&spi->dev, "reset", GPIOD_OUT_LOW);158 if (IS_ERR(st->reset))159 return PTR_ERR(st->reset);160 gpiod_set_consumer_name(st->reset, "LMS283GF05 RESET");161 162 ld = devm_lcd_device_register(&spi->dev, "lms283gf05", &spi->dev, st,163 &lms_ops);164 if (IS_ERR(ld))165 return PTR_ERR(ld);166 167 st->spi = spi;168 st->ld = ld;169 170 spi_set_drvdata(spi, st);171 172 /* kick in the LCD */173 if (st->reset)174 lms283gf05_reset(st->reset);175 lms283gf05_toggle(spi, disp_initseq, ARRAY_SIZE(disp_initseq));176 177 return 0;178}179 180static struct spi_driver lms283gf05_driver = {181 .driver = {182 .name = "lms283gf05",183 },184 .probe = lms283gf05_probe,185};186 187module_spi_driver(lms283gf05_driver);188 189MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");190MODULE_DESCRIPTION("LCD283GF05 LCD");191MODULE_LICENSE("GPL v2");192