1/* 2 * FB driver for the UC1701 LCD Controller 3 * 4 * The display is monochrome and the video memory is RGB565. 5 * Any pixel value except 0 turns the pixel on. 6 * 7 * Copyright (C) 2014 Juergen Holzmann 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License as published by 11 * the Free Software Foundation; either version 2 of the License, or 12 * (at your option) any later version. 13 * 14 * This program is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 * GNU General Public License for more details. 18 * 19 * You should have received a copy of the GNU General Public License 20 * along with this program; if not, write to the Free Software 21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 22 */ 23 24#include <linux/module.h> 25#include <linux/kernel.h> 26#include <linux/init.h> 27#include <linux/gpio.h> 28#include <linux/spi/spi.h> 29#include <linux/delay.h> 30 31#include "fbtft.h" 32 33#define DRVNAME "fb_uc1701" 34#define WIDTH 102 35#define HEIGHT 64 36#define PAGES (HEIGHT/8) 37 38/* 1: Display on/off */ 39#define LCD_DISPLAY_ENABLE 0xAE 40/* 2: display start line set */ 41#define LCD_START_LINE 0x40 42/* 3: Page address set (lower 4 bits select one of the pages) */ 43#define LCD_PAGE_ADDRESS 0xB0 44/* 4: column address */ 45#define LCD_COL_ADDRESS 0x10 46/* 8: select orientation */ 47#define LCD_BOTTOMVIEW 0xA0 48/* 9: inverted display */ 49#define LCD_DISPLAY_INVERT 0xA6 50/* 10: show memory content or switch all pixels on */ 51#define LCD_ALL_PIXEL 0xA4 52/* 11: lcd bias set */ 53#define LCD_BIAS 0xA2 54/* 14: Reset Controller */ 55#define LCD_RESET_CMD 0xE2 56/* 15: output mode select (turns display upside-down) */ 57#define LCD_SCAN_DIR 0xC0 58/* 16: power control set */ 59#define LCD_POWER_CONTROL 0x28 60/* 17: voltage regulator resistor ratio set */ 61#define LCD_VOLTAGE 0x20 62/* 18: Volume mode set */ 63#define LCD_VOLUME_MODE 0x81 64/* 22: NOP command */ 65#define LCD_NO_OP 0xE3 66/* 25: advanced program control */ 67#define LCD_ADV_PROG_CTRL 0xFA 68/* 25: advanced program control2 */ 69#define LCD_ADV_PROG_CTRL2 0x10 70#define LCD_TEMPCOMP_HIGH 0x80 71/* column offset for normal orientation */ 72#define SHIFT_ADDR_NORMAL 0 73/* column offset for bottom view orientation */ 74#define SHIFT_ADDR_TOPVIEW 30 75 76 77static int init_display(struct fbtft_par *par) 78{ 79 fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__); 80 81 par->fbtftops.reset(par); 82 83 /* softreset of LCD */ 84 write_reg(par, LCD_RESET_CMD); 85 mdelay(10); 86 87 /* set startpoint */ 88 /* LCD_START_LINE | (pos & 0x3F) */ 89 write_reg(par, LCD_START_LINE); 90 91 /* select orientation BOTTOMVIEW */ 92 write_reg(par, LCD_BOTTOMVIEW | 1); 93 /* output mode select (turns display upside-down) */ 94 write_reg(par, LCD_SCAN_DIR | 0x00); 95 96 /* Normal Pixel mode */ 97 write_reg(par, LCD_ALL_PIXEL | 0); 98 99 /* positive display */ 100 write_reg(par, LCD_DISPLAY_INVERT | 0); 101 102 /* bias 1/9 */ 103 write_reg(par, LCD_BIAS | 0); 104 105 /* power control mode: all features on */ 106 /* LCD_POWER_CONTROL | (val&0x07) */ 107 write_reg(par, LCD_POWER_CONTROL | 0x07); 108 109 /* set voltage regulator R/R */ 110 /* LCD_VOLTAGE | (val&0x07) */ 111 write_reg(par, LCD_VOLTAGE | 0x07); 112 113 /* volume mode set */ 114 /* LCD_VOLUME_MODE,val&0x3f,LCD_NO_OP */ 115 write_reg(par, LCD_VOLUME_MODE); 116 /* LCD_VOLUME_MODE,val&0x3f,LCD_NO_OP */ 117 write_reg(par, 0x09); 118 /* ???? */ 119 /* LCD_VOLUME_MODE,val&0x3f,LCD_NO_OP */ 120 write_reg(par, LCD_NO_OP); 121 122 /* advanced program control */ 123 write_reg(par, LCD_ADV_PROG_CTRL); 124 write_reg(par, LCD_ADV_PROG_CTRL2|LCD_TEMPCOMP_HIGH); 125 126 /* enable display */ 127 write_reg(par, LCD_DISPLAY_ENABLE | 1); 128 129 return 0; 130} 131 132static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye) 133{ 134 fbtft_par_dbg(DEBUG_SET_ADDR_WIN, par, "%s(xs=%d, ys=%d, xe=%d, ye=%d)\n", __func__, xs, ys, xe, ye); 135 136 /* goto address */ 137 /* LCD_PAGE_ADDRESS | ((page) & 0x1F), 138 (((col)+SHIFT_ADDR_NORMAL) & 0x0F), 139 LCD_COL_ADDRESS | ((((col)+SHIFT_ADDR_NORMAL)>>4) & 0x0F) */ 140 write_reg(par, LCD_PAGE_ADDRESS); 141 /* LCD_PAGE_ADDRESS | ((page) & 0x1F), 142 (((col)+SHIFT_ADDR_NORMAL) & 0x0F), 143 LCD_COL_ADDRESS | ((((col)+SHIFT_ADDR_NORMAL)>>4) & 0x0F) */ 144 write_reg(par, 0x00); 145 /* LCD_PAGE_ADDRESS | ((page) & 0x1F), 146 (((col)+SHIFT_ADDR_NORMAL) & 0x0F), 147 LCD_COL_ADDRESS | ((((col)+SHIFT_ADDR_NORMAL)>>4) & 0x0F) */ 148 write_reg(par, LCD_COL_ADDRESS); 149} 150 151static int write_vmem(struct fbtft_par *par, size_t offset, size_t len) 152{ 153 u16 *vmem16 = (u16 *)par->info->screen_base; 154 u8 *buf = par->txbuf.buf; 155 int x, y, i; 156 int ret = 0; 157 158 fbtft_par_dbg(DEBUG_WRITE_VMEM, par, "%s()\n", __func__); 159 160 for (y = 0; y < PAGES; y++) { 161 buf = par->txbuf.buf; 162 for (x = 0; x < WIDTH; x++) { 163 *buf = 0x00; 164 for (i = 0; i < 8; i++) 165 *buf |= (vmem16[((y*8*WIDTH)+(i*WIDTH))+x] ? 1 : 0) << i; 166 buf++; 167 } 168 /* LCD_PAGE_ADDRESS | ((page) & 0x1F), 169 (((col)+SHIFT_ADDR_NORMAL) & 0x0F), 170 LCD_COL_ADDRESS | ((((col)+SHIFT_ADDR_NORMAL)>>4) & 0x0F) */ 171 write_reg(par, LCD_PAGE_ADDRESS|(u8)y); 172 /* LCD_PAGE_ADDRESS | ((page) & 0x1F), 173 (((col)+SHIFT_ADDR_NORMAL) & 0x0F), 174 LCD_COL_ADDRESS | ((((col)+SHIFT_ADDR_NORMAL)>>4) & 0x0F) */ 175 write_reg(par, 0x00); 176 /* LCD_PAGE_ADDRESS | ((page) & 0x1F), 177 (((col)+SHIFT_ADDR_NORMAL) & 0x0F), 178 LCD_COL_ADDRESS | ((((col)+SHIFT_ADDR_NORMAL)>>4) & 0x0F) */ 179 write_reg(par, LCD_COL_ADDRESS); 180 gpio_set_value(par->gpio.dc, 1); 181 ret = par->fbtftops.write(par, par->txbuf.buf, WIDTH); 182 gpio_set_value(par->gpio.dc, 0); 183 } 184 185 if (ret < 0) 186 dev_err(par->info->device, "write failed and returned: %d\n", 187 ret); 188 189 return ret; 190} 191 192 193static struct fbtft_display display = { 194 .regwidth = 8, 195 .width = WIDTH, 196 .height = HEIGHT, 197 .fbtftops = { 198 .init_display = init_display, 199 .set_addr_win = set_addr_win, 200 .write_vmem = write_vmem, 201 }, 202 .backlight = 1, 203}; 204FBTFT_REGISTER_DRIVER(DRVNAME, "UltraChip,uc1701", &display); 205 206MODULE_ALIAS("spi:" DRVNAME); 207MODULE_ALIAS("spi:uc1701"); 208 209MODULE_DESCRIPTION("FB driver for the UC1701 LCD Controller"); 210MODULE_AUTHOR("Juergen Holzmann"); 211MODULE_LICENSE("GPL"); 212