lms283gf05.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * lms283gf05.c -- support for Samsung LMS283GF05 LCD
  4 *
  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 <= LCD_POWER_REDUCED) {
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");