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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 | // SPDX-License-Identifier: GPL-2.0-only /* * lms283gf05.c -- support for Samsung LMS283GF05 LCD * * Copyright (c) 2009 Marek Vasut <marek.vasut@gmail.com> */ #include <linux/device.h> #include <linux/kernel.h> #include <linux/delay.h> #include <linux/slab.h> #include <linux/gpio/consumer.h> #include <linux/lcd.h> #include <linux/spi/spi.h> #include <linux/module.h> struct lms283gf05_state { struct spi_device *spi; struct lcd_device *ld; struct gpio_desc *reset; }; struct lms283gf05_seq { unsigned char reg; unsigned short value; unsigned char delay; }; /* Magic sequences supplied by manufacturer, for details refer to datasheet */ static const struct lms283gf05_seq disp_initseq[] = { /* REG, VALUE, DELAY */ { 0x07, 0x0000, 0 }, { 0x13, 0x0000, 10 }, { 0x11, 0x3004, 0 }, { 0x14, 0x200F, 0 }, { 0x10, 0x1a20, 0 }, { 0x13, 0x0040, 50 }, { 0x13, 0x0060, 0 }, { 0x13, 0x0070, 200 }, { 0x01, 0x0127, 0 }, { 0x02, 0x0700, 0 }, { 0x03, 0x1030, 0 }, { 0x08, 0x0208, 0 }, { 0x0B, 0x0620, 0 }, { 0x0C, 0x0110, 0 }, { 0x30, 0x0120, 0 }, { 0x31, 0x0127, 0 }, { 0x32, 0x0000, 0 }, { 0x33, 0x0503, 0 }, { 0x34, 0x0727, 0 }, { 0x35, 0x0124, 0 }, { 0x36, 0x0706, 0 }, { 0x37, 0x0701, 0 }, { 0x38, 0x0F00, 0 }, { 0x39, 0x0F00, 0 }, { 0x40, 0x0000, 0 }, { 0x41, 0x0000, 0 }, { 0x42, 0x013f, 0 }, { 0x43, 0x0000, 0 }, { 0x44, 0x013f, 0 }, { 0x45, 0x0000, 0 }, { 0x46, 0xef00, 0 }, { 0x47, 0x013f, 0 }, { 0x48, 0x0000, 0 }, { 0x07, 0x0015, 30 }, { 0x07, 0x0017, 0 }, { 0x20, 0x0000, 0 }, { 0x21, 0x0000, 0 }, { 0x22, 0x0000, 0 } }; static const struct lms283gf05_seq disp_pdwnseq[] = { { 0x07, 0x0016, 30 }, { 0x07, 0x0004, 0 }, { 0x10, 0x0220, 20 }, { 0x13, 0x0060, 50 }, { 0x13, 0x0040, 50 }, { 0x13, 0x0000, 0 }, { 0x10, 0x0000, 0 } }; static void lms283gf05_reset(struct gpio_desc *gpiod) { gpiod_set_value(gpiod, 0); /* De-asserted */ mdelay(100); gpiod_set_value(gpiod, 1); /* Asserted */ mdelay(20); gpiod_set_value(gpiod, 0); /* De-asserted */ mdelay(20); } static void lms283gf05_toggle(struct spi_device *spi, const struct lms283gf05_seq *seq, int sz) { char buf[3]; int i; for (i = 0; i < sz; i++) { buf[0] = 0x74; buf[1] = 0x00; buf[2] = seq[i].reg; spi_write(spi, buf, 3); buf[0] = 0x76; buf[1] = seq[i].value >> 8; buf[2] = seq[i].value & 0xff; spi_write(spi, buf, 3); mdelay(seq[i].delay); } } static int lms283gf05_power_set(struct lcd_device *ld, int power) { struct lms283gf05_state *st = lcd_get_data(ld); struct spi_device *spi = st->spi; if (power <= FB_BLANK_NORMAL) { if (st->reset) lms283gf05_reset(st->reset); lms283gf05_toggle(spi, disp_initseq, ARRAY_SIZE(disp_initseq)); } else { lms283gf05_toggle(spi, disp_pdwnseq, ARRAY_SIZE(disp_pdwnseq)); if (st->reset) gpiod_set_value(st->reset, 1); /* Asserted */ } return 0; } static struct lcd_ops lms_ops = { .set_power = lms283gf05_power_set, .get_power = NULL, }; static int lms283gf05_probe(struct spi_device *spi) { struct lms283gf05_state *st; struct lcd_device *ld; st = devm_kzalloc(&spi->dev, sizeof(struct lms283gf05_state), GFP_KERNEL); if (st == NULL) return -ENOMEM; st->reset = gpiod_get_optional(&spi->dev, "reset", GPIOD_OUT_LOW); if (IS_ERR(st->reset)) return PTR_ERR(st->reset); gpiod_set_consumer_name(st->reset, "LMS283GF05 RESET"); ld = devm_lcd_device_register(&spi->dev, "lms283gf05", &spi->dev, st, &lms_ops); if (IS_ERR(ld)) return PTR_ERR(ld); st->spi = spi; st->ld = ld; spi_set_drvdata(spi, st); /* kick in the LCD */ if (st->reset) lms283gf05_reset(st->reset); lms283gf05_toggle(spi, disp_initseq, ARRAY_SIZE(disp_initseq)); return 0; } static struct spi_driver lms283gf05_driver = { .driver = { .name = "lms283gf05", }, .probe = lms283gf05_probe, }; module_spi_driver(lms283gf05_driver); MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>"); MODULE_DESCRIPTION("LCD283GF05 LCD"); MODULE_LICENSE("GPL v2"); |