1/* 2 * FB driver for the ILI9320 LCD Controller 3 * 4 * Copyright (C) 2013 Noralf Tronnes 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 as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 */ 16 17#include <linux/module.h> 18#include <linux/kernel.h> 19#include <linux/init.h> 20#include <linux/gpio.h> 21#include <linux/spi/spi.h> 22#include <linux/delay.h> 23 24#include "fbtft.h" 25 26#define DRVNAME "fb_ili9320" 27#define WIDTH 240 28#define HEIGHT 320 29#define DEFAULT_GAMMA "07 07 6 0 0 0 5 5 4 0\n" \ 30 "07 08 4 7 5 1 2 0 7 7" 31 32static unsigned read_devicecode(struct fbtft_par *par) 33{ 34 int ret; 35 u8 rxbuf[8] = {0, }; 36 37 write_reg(par, 0x0000); 38 ret = par->fbtftops.read(par, rxbuf, 4); 39 return (rxbuf[2] << 8) | rxbuf[3]; 40} 41 42static int init_display(struct fbtft_par *par) 43{ 44 unsigned devcode; 45 46 par->fbtftops.reset(par); 47 48 devcode = read_devicecode(par); 49 fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "Device code: 0x%04X\n", 50 devcode); 51 if ((devcode != 0x0000) && (devcode != 0x9320)) 52 dev_warn(par->info->device, 53 "Unrecognized Device code: 0x%04X (expected 0x9320)\n", 54 devcode); 55 56 /* Initialization sequence from ILI9320 Application Notes */ 57 58 /* *********** Start Initial Sequence ********* */ 59 /* Set the Vcore voltage and this setting is must. */ 60 write_reg(par, 0x00E5, 0x8000); 61 62 /* Start internal OSC. */ 63 write_reg(par, 0x0000, 0x0001); 64 65 /* set SS and SM bit */ 66 write_reg(par, 0x0001, 0x0100); 67 68 /* set 1 line inversion */ 69 write_reg(par, 0x0002, 0x0700); 70 71 /* Resize register */ 72 write_reg(par, 0x0004, 0x0000); 73 74 /* set the back and front porch */ 75 write_reg(par, 0x0008, 0x0202); 76 77 /* set non-display area refresh cycle */ 78 write_reg(par, 0x0009, 0x0000); 79 80 /* FMARK function */ 81 write_reg(par, 0x000A, 0x0000); 82 83 /* RGB interface setting */ 84 write_reg(par, 0x000C, 0x0000); 85 86 /* Frame marker Position */ 87 write_reg(par, 0x000D, 0x0000); 88 89 /* RGB interface polarity */ 90 write_reg(par, 0x000F, 0x0000); 91 92 /* ***********Power On sequence *************** */ 93 /* SAP, BT[3:0], AP, DSTB, SLP, STB */ 94 write_reg(par, 0x0010, 0x0000); 95 96 /* DC1[2:0], DC0[2:0], VC[2:0] */ 97 write_reg(par, 0x0011, 0x0007); 98 99 /* VREG1OUT voltage */ 100 write_reg(par, 0x0012, 0x0000); 101 102 /* VDV[4:0] for VCOM amplitude */ 103 write_reg(par, 0x0013, 0x0000); 104 105 /* Dis-charge capacitor power voltage */ 106 mdelay(200); 107 108 /* SAP, BT[3:0], AP, DSTB, SLP, STB */ 109 write_reg(par, 0x0010, 0x17B0); 110 111 /* R11h=0x0031 at VCI=3.3V DC1[2:0], DC0[2:0], VC[2:0] */ 112 write_reg(par, 0x0011, 0x0031); 113 mdelay(50); 114 115 /* R12h=0x0138 at VCI=3.3V VREG1OUT voltage */ 116 write_reg(par, 0x0012, 0x0138); 117 mdelay(50); 118 119 /* R13h=0x1800 at VCI=3.3V VDV[4:0] for VCOM amplitude */ 120 write_reg(par, 0x0013, 0x1800); 121 122 /* R29h=0x0008 at VCI=3.3V VCM[4:0] for VCOMH */ 123 write_reg(par, 0x0029, 0x0008); 124 mdelay(50); 125 126 /* GRAM horizontal Address */ 127 write_reg(par, 0x0020, 0x0000); 128 129 /* GRAM Vertical Address */ 130 write_reg(par, 0x0021, 0x0000); 131 132 /* ------------------ Set GRAM area --------------- */ 133 /* Horizontal GRAM Start Address */ 134 write_reg(par, 0x0050, 0x0000); 135 136 /* Horizontal GRAM End Address */ 137 write_reg(par, 0x0051, 0x00EF); 138 139 /* Vertical GRAM Start Address */ 140 write_reg(par, 0x0052, 0x0000); 141 142 /* Vertical GRAM End Address */ 143 write_reg(par, 0x0053, 0x013F); 144 145 /* Gate Scan Line */ 146 write_reg(par, 0x0060, 0x2700); 147 148 /* NDL,VLE, REV */ 149 write_reg(par, 0x0061, 0x0001); 150 151 /* set scrolling line */ 152 write_reg(par, 0x006A, 0x0000); 153 154 /* -------------- Partial Display Control --------- */ 155 write_reg(par, 0x0080, 0x0000); 156 write_reg(par, 0x0081, 0x0000); 157 write_reg(par, 0x0082, 0x0000); 158 write_reg(par, 0x0083, 0x0000); 159 write_reg(par, 0x0084, 0x0000); 160 write_reg(par, 0x0085, 0x0000); 161 162 /* -------------- Panel Control ------------------- */ 163 write_reg(par, 0x0090, 0x0010); 164 write_reg(par, 0x0092, 0x0000); 165 write_reg(par, 0x0093, 0x0003); 166 write_reg(par, 0x0095, 0x0110); 167 write_reg(par, 0x0097, 0x0000); 168 write_reg(par, 0x0098, 0x0000); 169 write_reg(par, 0x0007, 0x0173); /* 262K color and display ON */ 170 171 return 0; 172} 173 174static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye) 175{ 176 switch (par->info->var.rotate) { 177 /* R20h = Horizontal GRAM Start Address */ 178 /* R21h = Vertical GRAM Start Address */ 179 case 0: 180 write_reg(par, 0x0020, xs); 181 write_reg(par, 0x0021, ys); 182 break; 183 case 180: 184 write_reg(par, 0x0020, WIDTH - 1 - xs); 185 write_reg(par, 0x0021, HEIGHT - 1 - ys); 186 break; 187 case 270: 188 write_reg(par, 0x0020, WIDTH - 1 - ys); 189 write_reg(par, 0x0021, xs); 190 break; 191 case 90: 192 write_reg(par, 0x0020, ys); 193 write_reg(par, 0x0021, HEIGHT - 1 - xs); 194 break; 195 } 196 write_reg(par, 0x0022); /* Write Data to GRAM */ 197} 198 199static int set_var(struct fbtft_par *par) 200{ 201 switch (par->info->var.rotate) { 202 case 0: 203 write_reg(par, 0x3, (par->bgr << 12) | 0x30); 204 break; 205 case 270: 206 write_reg(par, 0x3, (par->bgr << 12) | 0x28); 207 break; 208 case 180: 209 write_reg(par, 0x3, (par->bgr << 12) | 0x00); 210 break; 211 case 90: 212 write_reg(par, 0x3, (par->bgr << 12) | 0x18); 213 break; 214 } 215 return 0; 216} 217 218/* 219 Gamma string format: 220 VRP0 VRP1 RP0 RP1 KP0 KP1 KP2 KP3 KP4 KP5 221 VRN0 VRN1 RN0 RN1 KN0 KN1 KN2 KN3 KN4 KN5 222*/ 223#define CURVE(num, idx) curves[num * par->gamma.num_values + idx] 224static int set_gamma(struct fbtft_par *par, unsigned long *curves) 225{ 226 unsigned long mask[] = { 227 0x1f, 0x1f, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 228 0x1f, 0x1f, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 229 }; 230 int i, j; 231 232 /* apply mask */ 233 for (i = 0; i < 2; i++) 234 for (j = 0; j < 10; j++) 235 CURVE(i, j) &= mask[i * par->gamma.num_values + j]; 236 237 write_reg(par, 0x0030, CURVE(0, 5) << 8 | CURVE(0, 4)); 238 write_reg(par, 0x0031, CURVE(0, 7) << 8 | CURVE(0, 6)); 239 write_reg(par, 0x0032, CURVE(0, 9) << 8 | CURVE(0, 8)); 240 write_reg(par, 0x0035, CURVE(0, 3) << 8 | CURVE(0, 2)); 241 write_reg(par, 0x0036, CURVE(0, 1) << 8 | CURVE(0, 0)); 242 243 write_reg(par, 0x0037, CURVE(1, 5) << 8 | CURVE(1, 4)); 244 write_reg(par, 0x0038, CURVE(1, 7) << 8 | CURVE(1, 6)); 245 write_reg(par, 0x0039, CURVE(1, 9) << 8 | CURVE(1, 8)); 246 write_reg(par, 0x003C, CURVE(1, 3) << 8 | CURVE(1, 2)); 247 write_reg(par, 0x003D, CURVE(1, 1) << 8 | CURVE(1, 0)); 248 249 return 0; 250} 251#undef CURVE 252 253static struct fbtft_display display = { 254 .regwidth = 16, 255 .width = WIDTH, 256 .height = HEIGHT, 257 .gamma_num = 2, 258 .gamma_len = 10, 259 .gamma = DEFAULT_GAMMA, 260 .fbtftops = { 261 .init_display = init_display, 262 .set_addr_win = set_addr_win, 263 .set_var = set_var, 264 .set_gamma = set_gamma, 265 }, 266}; 267 268FBTFT_REGISTER_DRIVER(DRVNAME, "ilitek,ili9320", &display); 269 270MODULE_ALIAS("spi:" DRVNAME); 271MODULE_ALIAS("platform:" DRVNAME); 272MODULE_ALIAS("spi:ili9320"); 273MODULE_ALIAS("platform:ili9320"); 274 275MODULE_DESCRIPTION("FB driver for the ILI9320 LCD Controller"); 276MODULE_AUTHOR("Noralf Tronnes"); 277MODULE_LICENSE("GPL"); 278