root/drivers/staging/fbtft/fb_ili9340.c

DEFINITIONS

1. init_display
2. set_addr_win
3. set_var

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