drivers/staging/fbtft/fb_ili9340.c

   1 /*
   2  * FB driver for the ILI9340 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/delay.h>
  22 #include <video/mipi_display.h>
  23
  24 #include "fbtft.h"
  25
  26 #define DRVNAME         "fb_ili9340"
  27 #define WIDTH           240
  28 #define HEIGHT          320
  29
  30 /* Init sequence taken from: Arduino Library for the Adafruit 2.2" display */
  31 static int init_display(struct fbtft_par *par)
  32 {
  33         par->fbtftops.reset(par);
  34
  35         write_reg(par, 0xEF, 0x03, 0x80, 0x02);
  36         write_reg(par, 0xCF, 0x00, 0XC1, 0X30);
  37         write_reg(par, 0xED, 0x64, 0x03, 0X12, 0X81);
  38         write_reg(par, 0xE8, 0x85, 0x00, 0x78);
  39         write_reg(par, 0xCB, 0x39, 0x2C, 0x00, 0x34, 0x02);
  40         write_reg(par, 0xF7, 0x20);
  41         write_reg(par, 0xEA, 0x00, 0x00);
  42
  43         /* Power Control 1 */
  44         write_reg(par, 0xC0, 0x23);
  45
  46         /* Power Control 2 */
  47         write_reg(par, 0xC1, 0x10);
  48
  49         /* VCOM Control 1 */
  50         write_reg(par, 0xC5, 0x3e, 0x28);
  51
  52         /* VCOM Control 2 */
  53         write_reg(par, 0xC7, 0x86);
  54
  55         /* COLMOD: Pixel Format Set */
  56         /* 16 bits/pixel */
  57         write_reg(par, MIPI_DCS_SET_PIXEL_FORMAT, 0x55);
  58
  59         /* Frame Rate Control */
  60         /* Division ratio = fosc, Frame Rate = 79Hz */
  61         write_reg(par, 0xB1, 0x00, 0x18);
  62
  63         /* Display Function Control */
  64         write_reg(par, 0xB6, 0x08, 0x82, 0x27);
  65
  66         /* Gamma Function Disable */
  67         write_reg(par, 0xF2, 0x00);
  68
  69         /* Gamma curve selection */
  70         write_reg(par, MIPI_DCS_SET_GAMMA_CURVE, 0x01);
  71
  72         /* Positive Gamma Correction */
  73         write_reg(par, 0xE0,
  74                   0x0F, 0x31, 0x2B, 0x0C, 0x0E, 0x08, 0x4E, 0xF1,
  75                   0x37, 0x07, 0x10, 0x03, 0x0E, 0x09, 0x00);
  76
  77         /* Negative Gamma Correction */
  78         write_reg(par, 0xE1,
  79                   0x00, 0x0E, 0x14, 0x03, 0x11, 0x07, 0x31, 0xC1,
  80                   0x48, 0x08, 0x0F, 0x0C, 0x31, 0x36, 0x0F);
  81
  82         write_reg(par, MIPI_DCS_EXIT_SLEEP_MODE);
  83
  84         mdelay(120);
  85
  86         write_reg(par, MIPI_DCS_SET_DISPLAY_ON);
  87
  88         return 0;
  89 }
  90
  91 static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
  92 {
  93         write_reg(par, MIPI_DCS_SET_COLUMN_ADDRESS,
  94                   xs >> 8, xs & 0xFF, xe >> 8, xe & 0xFF);
  95
  96         write_reg(par, MIPI_DCS_SET_PAGE_ADDRESS,
  97                   ys >> 8, ys & 0xFF, ye >> 8, ye & 0xFF);
  98
  99         write_reg(par, MIPI_DCS_WRITE_MEMORY_START);
 100 }
 101
 102 #define ILI9340_MADCTL_MV  0x20
 103 #define ILI9340_MADCTL_MX  0x40
 104 #define ILI9340_MADCTL_MY  0x80
 105 static int set_var(struct fbtft_par *par)
 106 {
 107         u8 val;
 108
 109         switch (par->info->var.rotate) {
 110         case 270:
 111                 val = ILI9340_MADCTL_MV;
 112                 break;
 113         case 180:
 114                 val = ILI9340_MADCTL_MY;
 115                 break;
 116         case 90:
 117                 val = ILI9340_MADCTL_MV | ILI9340_MADCTL_MY | ILI9340_MADCTL_MX;
 118                 break;
 119         default:
 120                 val = ILI9340_MADCTL_MX;
 121                 break;
 122         }
 123         /* Memory Access Control  */
 124         write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, val | (par->bgr << 3));
 125
 126         return 0;
 127 }
 128
 129 static struct fbtft_display display = {
 130         .regwidth = 8,
 131         .width = WIDTH,
 132         .height = HEIGHT,
 133         .fbtftops = {
 134                 .init_display = init_display,
 135                 .set_addr_win = set_addr_win,
 136                 .set_var = set_var,
 137         },
 138 };
 139
 140 FBTFT_REGISTER_DRIVER(DRVNAME, "ilitek,ili9340", &display);
 141
 142 MODULE_ALIAS("spi:" DRVNAME);
 143 MODULE_ALIAS("platform:" DRVNAME);
 144 MODULE_ALIAS("spi:ili9340");
 145 MODULE_ALIAS("platform:ili9340");
 146
 147 MODULE_DESCRIPTION("FB driver for the ILI9340 LCD Controller");
 148 MODULE_AUTHOR("Noralf Tronnes");
 149 MODULE_LICENSE("GPL");