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 dev_err(&spi->dev, "No memory for device state\n"); 173 return -ENOMEM; 174 } 175 176 ld = devm_lcd_device_register(&spi->dev, "lms283gf05", &spi->dev, st, 177 &lms_ops); 178 if (IS_ERR(ld)) 179 return PTR_ERR(ld); 180 181 st->spi = spi; 182 st->ld = ld; 183 184 spi_set_drvdata(spi, st); 185 186 /* kick in the LCD */ 187 if (pdata) 188 lms283gf05_reset(pdata->reset_gpio, pdata->reset_inverted); 189 lms283gf05_toggle(spi, disp_initseq, ARRAY_SIZE(disp_initseq)); 190 191 return 0; 192 } 193 194 static struct spi_driver lms283gf05_driver = { 195 .driver = { 196 .name = "lms283gf05", 197 .owner = THIS_MODULE, 198 }, 199 .probe = lms283gf05_probe, 200 }; 201 202 module_spi_driver(lms283gf05_driver); 203 204 MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>"); 205 MODULE_DESCRIPTION("LCD283GF05 LCD"); 206 MODULE_LICENSE("GPL v2"); 207