drivers/staging/fbtft/fb_ili9340.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * FB driver for the ILI9340 LCD Controller
   4  *
   5  * Copyright (C) 2013 Noralf Tronnes
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/kernel.h>
  10 #include <linux/init.h>
  11 #include <linux/delay.h>
  12 #include <video/mipi_display.h>
  13
  14 #include "fbtft.h"
  15
  16 #define DRVNAME         "fb_ili9340"
  17 #define WIDTH           240
  18 #define HEIGHT          320
  19
  20 /* Init sequence taken from: Arduino Library for the Adafruit 2.2" display */
  21 static int init_display(struct fbtft_par *par)
  22 {
  23         par->fbtftops.reset(par);
  24
  25         write_reg(par, 0xEF, 0x03, 0x80, 0x02);
  26         write_reg(par, 0xCF, 0x00, 0XC1, 0X30);
  27         write_reg(par, 0xED, 0x64, 0x03, 0X12, 0X81);
  28         write_reg(par, 0xE8, 0x85, 0x00, 0x78);
  29         write_reg(par, 0xCB, 0x39, 0x2C, 0x00, 0x34, 0x02);
  30         write_reg(par, 0xF7, 0x20);
  31         write_reg(par, 0xEA, 0x00, 0x00);
  32
  33         /* Power Control 1 */
  34         write_reg(par, 0xC0, 0x23);
  35
  36         /* Power Control 2 */
  37         write_reg(par, 0xC1, 0x10);
  38
  39         /* VCOM Control 1 */
  40         write_reg(par, 0xC5, 0x3e, 0x28);
  41
  42         /* VCOM Control 2 */
  43         write_reg(par, 0xC7, 0x86);
  44
  45         /* COLMOD: Pixel Format Set */
  46         /* 16 bits/pixel */
  47         write_reg(par, MIPI_DCS_SET_PIXEL_FORMAT, 0x55);
  48
  49         /* Frame Rate Control */
  50         /* Division ratio = fosc, Frame Rate = 79Hz */
  51         write_reg(par, 0xB1, 0x00, 0x18);
  52
  53         /* Display Function Control */
  54         write_reg(par, 0xB6, 0x08, 0x82, 0x27);
  55
  56         /* Gamma Function Disable */
  57         write_reg(par, 0xF2, 0x00);
  58
  59         /* Gamma curve selection */
  60         write_reg(par, MIPI_DCS_SET_GAMMA_CURVE, 0x01);
  61
  62         /* Positive Gamma Correction */
  63         write_reg(par, 0xE0,
  64                   0x0F, 0x31, 0x2B, 0x0C, 0x0E, 0x08, 0x4E, 0xF1,
  65                   0x37, 0x07, 0x10, 0x03, 0x0E, 0x09, 0x00);
  66
  67         /* Negative Gamma Correction */
  68         write_reg(par, 0xE1,
  69                   0x00, 0x0E, 0x14, 0x03, 0x11, 0x07, 0x31, 0xC1,
  70                   0x48, 0x08, 0x0F, 0x0C, 0x31, 0x36, 0x0F);
  71
  72         write_reg(par, MIPI_DCS_EXIT_SLEEP_MODE);
  73
  74         mdelay(120);
  75
  76         write_reg(par, MIPI_DCS_SET_DISPLAY_ON);
  77
  78         return 0;
  79 }
  80
  81 static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
  82 {
  83         write_reg(par, MIPI_DCS_SET_COLUMN_ADDRESS,
  84                   xs >> 8, xs & 0xFF, xe >> 8, xe & 0xFF);
  85
  86         write_reg(par, MIPI_DCS_SET_PAGE_ADDRESS,
  87                   ys >> 8, ys & 0xFF, ye >> 8, ye & 0xFF);
  88
  89         write_reg(par, MIPI_DCS_WRITE_MEMORY_START);
  90 }
  91
  92 #define ILI9340_MADCTL_MV  0x20
  93 #define ILI9340_MADCTL_MX  0x40
  94 #define ILI9340_MADCTL_MY  0x80
  95 static int set_var(struct fbtft_par *par)
  96 {
  97         u8 val;
  98
  99         switch (par->info->var.rotate) {
 100         case 270:
 101                 val = ILI9340_MADCTL_MV;
 102                 break;
 103         case 180:
 104                 val = ILI9340_MADCTL_MY;
 105                 break;
 106         case 90:
 107                 val = ILI9340_MADCTL_MV | ILI9340_MADCTL_MY | ILI9340_MADCTL_MX;
 108                 break;
 109         default:
 110                 val = ILI9340_MADCTL_MX;
 111                 break;
 112         }
 113         /* Memory Access Control  */
 114         write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, val | (par->bgr << 3));
 115
 116         return 0;
 117 }
 118
 119 static struct fbtft_display display = {
 120         .regwidth = 8,
 121         .width = WIDTH,
 122         .height = HEIGHT,
 123         .fbtftops = {
 124                 .init_display = init_display,
 125                 .set_addr_win = set_addr_win,
 126                 .set_var = set_var,
 127         },
 128 };
 129
 130 FBTFT_REGISTER_DRIVER(DRVNAME, "ilitek,ili9340", &display);
 131
 132 MODULE_ALIAS("spi:" DRVNAME);
 133 MODULE_ALIAS("platform:" DRVNAME);
 134 MODULE_ALIAS("spi:ili9340");
 135 MODULE_ALIAS("platform:ili9340");
 136
 137 MODULE_DESCRIPTION("FB driver for the ILI9340 LCD Controller");
 138 MODULE_AUTHOR("Noralf Tronnes");
 139 MODULE_LICENSE("GPL");