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 
18 struct lms283gf05_state {
19 	struct spi_device	*spi;
20 	struct lcd_device	*ld;
21 	struct gpio_desc	*reset;
22 };
23 
24 struct 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 */
31 static 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 
78 static 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 
93 static 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 
103 static 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 
124 static 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 
142 static struct lcd_ops lms_ops = {
143 	.set_power	= lms283gf05_power_set,
144 	.get_power	= NULL,
145 };
146 
147 static 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 
180 static struct spi_driver lms283gf05_driver = {
181 	.driver = {
182 		.name	= "lms283gf05",
183 	},
184 	.probe		= lms283gf05_probe,
185 };
186 
187 module_spi_driver(lms283gf05_driver);
188 
189 MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
190 MODULE_DESCRIPTION("LCD283GF05 LCD");
191 MODULE_LICENSE("GPL v2");
192