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/gpio.h> 15 #include <linux/lcd.h> 16 17 #include <linux/spi/spi.h> 18 #include <linux/spi/lms283gf05.h> 19 20 struct lms283gf05_state { 21 struct spi_device *spi; 22 struct lcd_device *ld; 23 }; 24 25 struct lms283gf05_seq { 26 unsigned char reg; 27 unsigned short value; 28 unsigned char delay; 29 }; 30 31 /* Magic sequences supplied by manufacturer, for details refer to datasheet */ 32 static struct lms283gf05_seq disp_initseq[] = { 33 /* REG, VALUE, DELAY */ 34 { 0x07, 0x0000, 0 }, 35 { 0x13, 0x0000, 10 }, 36 37 { 0x11, 0x3004, 0 }, 38 { 0x14, 0x200F, 0 }, 39 { 0x10, 0x1a20, 0 }, 40 { 0x13, 0x0040, 50 }, 41 42 { 0x13, 0x0060, 0 }, 43 { 0x13, 0x0070, 200 }, 44 45 { 0x01, 0x0127, 0 }, 46 { 0x02, 0x0700, 0 }, 47 { 0x03, 0x1030, 0 }, 48 { 0x08, 0x0208, 0 }, 49 { 0x0B, 0x0620, 0 }, 50 { 0x0C, 0x0110, 0 }, 51 { 0x30, 0x0120, 0 }, 52 { 0x31, 0x0127, 0 }, 53 { 0x32, 0x0000, 0 }, 54 { 0x33, 0x0503, 0 }, 55 { 0x34, 0x0727, 0 }, 56 { 0x35, 0x0124, 0 }, 57 { 0x36, 0x0706, 0 }, 58 { 0x37, 0x0701, 0 }, 59 { 0x38, 0x0F00, 0 }, 60 { 0x39, 0x0F00, 0 }, 61 { 0x40, 0x0000, 0 }, 62 { 0x41, 0x0000, 0 }, 63 { 0x42, 0x013f, 0 }, 64 { 0x43, 0x0000, 0 }, 65 { 0x44, 0x013f, 0 }, 66 { 0x45, 0x0000, 0 }, 67 { 0x46, 0xef00, 0 }, 68 { 0x47, 0x013f, 0 }, 69 { 0x48, 0x0000, 0 }, 70 { 0x07, 0x0015, 30 }, 71 72 { 0x07, 0x0017, 0 }, 73 74 { 0x20, 0x0000, 0 }, 75 { 0x21, 0x0000, 0 }, 76 { 0x22, 0x0000, 0 } 77 }; 78 79 static struct lms283gf05_seq disp_pdwnseq[] = { 80 { 0x07, 0x0016, 30 }, 81 82 { 0x07, 0x0004, 0 }, 83 { 0x10, 0x0220, 20 }, 84 85 { 0x13, 0x0060, 50 }, 86 87 { 0x13, 0x0040, 50 }, 88 89 { 0x13, 0x0000, 0 }, 90 { 0x10, 0x0000, 0 } 91 }; 92 93 94 static void lms283gf05_reset(unsigned long gpio, bool inverted) 95 { 96 gpio_set_value(gpio, !inverted); 97 mdelay(100); 98 gpio_set_value(gpio, inverted); 99 mdelay(20); 100 gpio_set_value(gpio, !inverted); 101 mdelay(20); 102 } 103 104 static void lms283gf05_toggle(struct spi_device *spi, 105 struct lms283gf05_seq *seq, int sz) 106 { 107 char buf[3]; 108 int i; 109 110 for (i = 0; i < sz; i++) { 111 buf[0] = 0x74; 112 buf[1] = 0x00; 113 buf[2] = seq[i].reg; 114 spi_write(spi, buf, 3); 115 116 buf[0] = 0x76; 117 buf[1] = seq[i].value >> 8; 118 buf[2] = seq[i].value & 0xff; 119 spi_write(spi, buf, 3); 120 121 mdelay(seq[i].delay); 122 } 123 } 124 125 static int lms283gf05_power_set(struct lcd_device *ld, int power) 126 { 127 struct lms283gf05_state *st = lcd_get_data(ld); 128 struct spi_device *spi = st->spi; 129 struct lms283gf05_pdata *pdata = spi->dev.platform_data; 130 131 if (power) { 132 if (pdata) 133 lms283gf05_reset(pdata->reset_gpio, 134 pdata->reset_inverted); 135 lms283gf05_toggle(spi, disp_initseq, ARRAY_SIZE(disp_initseq)); 136 } else { 137 lms283gf05_toggle(spi, disp_pdwnseq, ARRAY_SIZE(disp_pdwnseq)); 138 if (pdata) 139 gpio_set_value(pdata->reset_gpio, 140 pdata->reset_inverted); 141 } 142 143 return 0; 144 } 145 146 static struct lcd_ops lms_ops = { 147 .set_power = lms283gf05_power_set, 148 .get_power = NULL, 149 }; 150 151 static int __devinit lms283gf05_probe(struct spi_device *spi) 152 { 153 struct lms283gf05_state *st; 154 struct lms283gf05_pdata *pdata = spi->dev.platform_data; 155 struct lcd_device *ld; 156 int ret = 0; 157 158 if (pdata != NULL) { 159 ret = gpio_request(pdata->reset_gpio, "LMS285GF05 RESET"); 160 if (ret) 161 return ret; 162 163 ret = gpio_direction_output(pdata->reset_gpio, 164 !pdata->reset_inverted); 165 if (ret) 166 goto err; 167 } 168 169 st = kzalloc(sizeof(struct lms283gf05_state), GFP_KERNEL); 170 if (st == NULL) { 171 dev_err(&spi->dev, "No memory for device state\n"); 172 ret = -ENOMEM; 173 goto err; 174 } 175 176 ld = lcd_device_register("lms283gf05", &spi->dev, st, &lms_ops); 177 if (IS_ERR(ld)) { 178 ret = PTR_ERR(ld); 179 goto err2; 180 } 181 182 st->spi = spi; 183 st->ld = ld; 184 185 dev_set_drvdata(&spi->dev, st); 186 187 /* kick in the LCD */ 188 if (pdata) 189 lms283gf05_reset(pdata->reset_gpio, pdata->reset_inverted); 190 lms283gf05_toggle(spi, disp_initseq, ARRAY_SIZE(disp_initseq)); 191 192 return 0; 193 194 err2: 195 kfree(st); 196 err: 197 if (pdata != NULL) 198 gpio_free(pdata->reset_gpio); 199 200 return ret; 201 } 202 203 static int __devexit lms283gf05_remove(struct spi_device *spi) 204 { 205 struct lms283gf05_state *st = dev_get_drvdata(&spi->dev); 206 struct lms283gf05_pdata *pdata = st->spi->dev.platform_data; 207 208 lcd_device_unregister(st->ld); 209 210 if (pdata != NULL) 211 gpio_free(pdata->reset_gpio); 212 213 kfree(st); 214 215 return 0; 216 } 217 218 static struct spi_driver lms283gf05_driver = { 219 .driver = { 220 .name = "lms283gf05", 221 .owner = THIS_MODULE, 222 }, 223 .probe = lms283gf05_probe, 224 .remove = __devexit_p(lms283gf05_remove), 225 }; 226 227 static __init int lms283gf05_init(void) 228 { 229 return spi_register_driver(&lms283gf05_driver); 230 } 231 232 static __exit void lms283gf05_exit(void) 233 { 234 spi_unregister_driver(&lms283gf05_driver); 235 } 236 237 module_init(lms283gf05_init); 238 module_exit(lms283gf05_exit); 239 240 MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>"); 241 MODULE_DESCRIPTION("LCD283GF05 LCD"); 242 MODULE_LICENSE("GPL v2"); 243