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(desc: gpiod, value: 0); /* De-asserted */ |
96 | mdelay(100); |
97 | gpiod_set_value(desc: gpiod, value: 1); /* Asserted */ |
98 | mdelay(20); |
99 | gpiod_set_value(desc: gpiod, value: 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, len: 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, len: 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_dev: ld); |
127 | struct spi_device *spi = st->spi; |
128 | |
129 | if (power <= FB_BLANK_NORMAL) { |
130 | if (st->reset) |
131 | lms283gf05_reset(gpiod: st->reset); |
132 | lms283gf05_toggle(spi, seq: disp_initseq, ARRAY_SIZE(disp_initseq)); |
133 | } else { |
134 | lms283gf05_toggle(spi, seq: disp_pdwnseq, ARRAY_SIZE(disp_pdwnseq)); |
135 | if (st->reset) |
136 | gpiod_set_value(desc: st->reset, value: 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(dev: &spi->dev, size: sizeof(struct lms283gf05_state), |
153 | GFP_KERNEL); |
154 | if (st == NULL) |
155 | return -ENOMEM; |
156 | |
157 | st->reset = gpiod_get_optional(dev: &spi->dev, con_id: "reset" , flags: GPIOD_OUT_LOW); |
158 | if (IS_ERR(ptr: st->reset)) |
159 | return PTR_ERR(ptr: st->reset); |
160 | gpiod_set_consumer_name(desc: st->reset, name: "LMS283GF05 RESET" ); |
161 | |
162 | ld = devm_lcd_device_register(dev: &spi->dev, name: "lms283gf05" , parent: &spi->dev, devdata: st, |
163 | ops: &lms_ops); |
164 | if (IS_ERR(ptr: ld)) |
165 | return PTR_ERR(ptr: ld); |
166 | |
167 | st->spi = spi; |
168 | st->ld = ld; |
169 | |
170 | spi_set_drvdata(spi, data: st); |
171 | |
172 | /* kick in the LCD */ |
173 | if (st->reset) |
174 | lms283gf05_reset(gpiod: st->reset); |
175 | lms283gf05_toggle(spi, seq: 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 | |