1 /*
2  * lms283gf05.c -- support for Samsung LMS283GF05 LCD
3  *
4  * Copyright (c) 2009 Marek Vasut <marek.vasut@gmail.com>
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 as
8  * published by the Free Software Foundation.
9  */
10 
11 #include <linux/device.h>
12 #include <linux/kernel.h>
13 #include <linux/delay.h>
14 #include <linux/slab.h>
15 #include <linux/gpio.h>
16 #include <linux/lcd.h>
17 
18 #include <linux/spi/spi.h>
19 #include <linux/spi/lms283gf05.h>
20 #include <linux/module.h>
21 
22 struct lms283gf05_state {
23 	struct spi_device	*spi;
24 	struct lcd_device	*ld;
25 };
26 
27 struct lms283gf05_seq {
28 	unsigned char		reg;
29 	unsigned short		value;
30 	unsigned char		delay;
31 };
32 
33 /* Magic sequences supplied by manufacturer, for details refer to datasheet */
34 static const struct lms283gf05_seq disp_initseq[] = {
35 	/* REG, VALUE, DELAY */
36 	{ 0x07, 0x0000, 0 },
37 	{ 0x13, 0x0000, 10 },
38 
39 	{ 0x11, 0x3004, 0 },
40 	{ 0x14, 0x200F, 0 },
41 	{ 0x10, 0x1a20, 0 },
42 	{ 0x13, 0x0040, 50 },
43 
44 	{ 0x13, 0x0060, 0 },
45 	{ 0x13, 0x0070, 200 },
46 
47 	{ 0x01, 0x0127, 0 },
48 	{ 0x02,	0x0700, 0 },
49 	{ 0x03, 0x1030, 0 },
50 	{ 0x08, 0x0208, 0 },
51 	{ 0x0B, 0x0620, 0 },
52 	{ 0x0C, 0x0110, 0 },
53 	{ 0x30, 0x0120, 0 },
54 	{ 0x31, 0x0127, 0 },
55 	{ 0x32, 0x0000, 0 },
56 	{ 0x33, 0x0503, 0 },
57 	{ 0x34, 0x0727, 0 },
58 	{ 0x35, 0x0124, 0 },
59 	{ 0x36, 0x0706, 0 },
60 	{ 0x37, 0x0701, 0 },
61 	{ 0x38, 0x0F00, 0 },
62 	{ 0x39, 0x0F00, 0 },
63 	{ 0x40, 0x0000, 0 },
64 	{ 0x41, 0x0000, 0 },
65 	{ 0x42, 0x013f, 0 },
66 	{ 0x43, 0x0000, 0 },
67 	{ 0x44, 0x013f, 0 },
68 	{ 0x45, 0x0000, 0 },
69 	{ 0x46, 0xef00, 0 },
70 	{ 0x47, 0x013f, 0 },
71 	{ 0x48, 0x0000, 0 },
72 	{ 0x07, 0x0015, 30 },
73 
74 	{ 0x07, 0x0017, 0 },
75 
76 	{ 0x20, 0x0000, 0 },
77 	{ 0x21, 0x0000, 0 },
78 	{ 0x22, 0x0000, 0 }
79 };
80 
81 static const struct lms283gf05_seq disp_pdwnseq[] = {
82 	{ 0x07, 0x0016, 30 },
83 
84 	{ 0x07, 0x0004, 0 },
85 	{ 0x10, 0x0220, 20 },
86 
87 	{ 0x13, 0x0060, 50 },
88 
89 	{ 0x13, 0x0040, 50 },
90 
91 	{ 0x13, 0x0000, 0 },
92 	{ 0x10, 0x0000, 0 }
93 };
94 
95 
96 static void lms283gf05_reset(unsigned long gpio, bool inverted)
97 {
98 	gpio_set_value(gpio, !inverted);
99 	mdelay(100);
100 	gpio_set_value(gpio, inverted);
101 	mdelay(20);
102 	gpio_set_value(gpio, !inverted);
103 	mdelay(20);
104 }
105 
106 static void lms283gf05_toggle(struct spi_device *spi,
107 				const struct lms283gf05_seq *seq, int sz)
108 {
109 	char buf[3];
110 	int i;
111 
112 	for (i = 0; i < sz; i++) {
113 		buf[0] = 0x74;
114 		buf[1] = 0x00;
115 		buf[2] = seq[i].reg;
116 		spi_write(spi, buf, 3);
117 
118 		buf[0] = 0x76;
119 		buf[1] = seq[i].value >> 8;
120 		buf[2] = seq[i].value & 0xff;
121 		spi_write(spi, buf, 3);
122 
123 		mdelay(seq[i].delay);
124 	}
125 }
126 
127 static int lms283gf05_power_set(struct lcd_device *ld, int power)
128 {
129 	struct lms283gf05_state *st = lcd_get_data(ld);
130 	struct spi_device *spi = st->spi;
131 	struct lms283gf05_pdata *pdata = dev_get_platdata(&spi->dev);
132 
133 	if (power <= FB_BLANK_NORMAL) {
134 		if (pdata)
135 			lms283gf05_reset(pdata->reset_gpio,
136 					pdata->reset_inverted);
137 		lms283gf05_toggle(spi, disp_initseq, ARRAY_SIZE(disp_initseq));
138 	} else {
139 		lms283gf05_toggle(spi, disp_pdwnseq, ARRAY_SIZE(disp_pdwnseq));
140 		if (pdata)
141 			gpio_set_value(pdata->reset_gpio,
142 					pdata->reset_inverted);
143 	}
144 
145 	return 0;
146 }
147 
148 static struct lcd_ops lms_ops = {
149 	.set_power	= lms283gf05_power_set,
150 	.get_power	= NULL,
151 };
152 
153 static int lms283gf05_probe(struct spi_device *spi)
154 {
155 	struct lms283gf05_state *st;
156 	struct lms283gf05_pdata *pdata = dev_get_platdata(&spi->dev);
157 	struct lcd_device *ld;
158 	int ret = 0;
159 
160 	if (pdata != NULL) {
161 		ret = devm_gpio_request_one(&spi->dev, pdata->reset_gpio,
162 				GPIOF_DIR_OUT | (!pdata->reset_inverted ?
163 				GPIOF_INIT_HIGH : GPIOF_INIT_LOW),
164 				"LMS285GF05 RESET");
165 		if (ret)
166 			return ret;
167 	}
168 
169 	st = devm_kzalloc(&spi->dev, sizeof(struct lms283gf05_state),
170 				GFP_KERNEL);
171 	if (st == NULL)
172 		return -ENOMEM;
173 
174 	ld = devm_lcd_device_register(&spi->dev, "lms283gf05", &spi->dev, st,
175 					&lms_ops);
176 	if (IS_ERR(ld))
177 		return PTR_ERR(ld);
178 
179 	st->spi = spi;
180 	st->ld = ld;
181 
182 	spi_set_drvdata(spi, st);
183 
184 	/* kick in the LCD */
185 	if (pdata)
186 		lms283gf05_reset(pdata->reset_gpio, pdata->reset_inverted);
187 	lms283gf05_toggle(spi, disp_initseq, ARRAY_SIZE(disp_initseq));
188 
189 	return 0;
190 }
191 
192 static struct spi_driver lms283gf05_driver = {
193 	.driver = {
194 		.name	= "lms283gf05",
195 		.owner	= THIS_MODULE,
196 	},
197 	.probe		= lms283gf05_probe,
198 };
199 
200 module_spi_driver(lms283gf05_driver);
201 
202 MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
203 MODULE_DESCRIPTION("LCD283GF05 LCD");
204 MODULE_LICENSE("GPL v2");
205