root/drivers/staging/fbtft/fb_tinylcd.c

DEFINITIONS

1. init_display
2. set_addr_win
3. set_var

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Custom FB driver for tinylcd.com display
   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_tinylcd"
  17 #define WIDTH           320
  18 #define HEIGHT          480
  19 
  20 static int init_display(struct fbtft_par *par)
  21 {
  22         par->fbtftops.reset(par);
  23 
  24         write_reg(par, 0xB0, 0x80);
  25         write_reg(par, 0xC0, 0x0A, 0x0A);
  26         write_reg(par, 0xC1, 0x45, 0x07);
  27         write_reg(par, 0xC2, 0x33);
  28         write_reg(par, 0xC5, 0x00, 0x42, 0x80);
  29         write_reg(par, 0xB1, 0xD0, 0x11);
  30         write_reg(par, 0xB4, 0x02);
  31         write_reg(par, 0xB6, 0x00, 0x22, 0x3B);
  32         write_reg(par, 0xB7, 0x07);
  33         write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, 0x58);
  34         write_reg(par, 0xF0, 0x36, 0xA5, 0xD3);
  35         write_reg(par, 0xE5, 0x80);
  36         write_reg(par, 0xE5, 0x01);
  37         write_reg(par, 0xB3, 0x00);
  38         write_reg(par, 0xE5, 0x00);
  39         write_reg(par, 0xF0, 0x36, 0xA5, 0x53);
  40         write_reg(par, 0xE0, 0x00, 0x35, 0x33, 0x00, 0x00, 0x00,
  41                        0x00, 0x35, 0x33, 0x00, 0x00, 0x00);
  42         write_reg(par, MIPI_DCS_SET_PIXEL_FORMAT, 0x55);
  43         write_reg(par, MIPI_DCS_EXIT_SLEEP_MODE);
  44         udelay(250);
  45         write_reg(par, MIPI_DCS_SET_DISPLAY_ON);
  46 
  47         return 0;
  48 }
  49 
  50 static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
  51 {
  52         write_reg(par, MIPI_DCS_SET_COLUMN_ADDRESS,
  53                   xs >> 8, xs & 0xFF, xe >> 8, xe & 0xFF);
  54 
  55         write_reg(par, MIPI_DCS_SET_PAGE_ADDRESS,
  56                   ys >> 8, ys & 0xFF, ye >> 8, ye & 0xFF);
  57 
  58         write_reg(par, MIPI_DCS_WRITE_MEMORY_START);
  59 }
  60 
  61 static int set_var(struct fbtft_par *par)
  62 {
  63         switch (par->info->var.rotate) {
  64         case 270:
  65                 write_reg(par, 0xB6, 0x00, 0x02, 0x3B);
  66                 write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, 0x28);
  67                 break;
  68         case 180:
  69                 write_reg(par, 0xB6, 0x00, 0x22, 0x3B);
  70                 write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, 0x58);
  71                 break;
  72         case 90:
  73                 write_reg(par, 0xB6, 0x00, 0x22, 0x3B);
  74                 write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, 0x38);
  75                 break;
  76         default:
  77                 write_reg(par, 0xB6, 0x00, 0x22, 0x3B);
  78                 write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, 0x08);
  79                 break;
  80         }
  81 
  82         return 0;
  83 }
  84 
  85 static struct fbtft_display display = {
  86         .regwidth = 8,
  87         .width = WIDTH,
  88         .height = HEIGHT,
  89         .fbtftops = {
  90                 .init_display = init_display,
  91                 .set_addr_win = set_addr_win,
  92                 .set_var = set_var,
  93         },
  94 };
  95 
  96 FBTFT_REGISTER_DRIVER(DRVNAME, "neosec,tinylcd", &display);
  97 
  98 MODULE_ALIAS("spi:" DRVNAME);
  99 MODULE_ALIAS("spi:tinylcd");
 100 
 101 MODULE_DESCRIPTION("Custom FB driver for tinylcd.com display");
 102 MODULE_AUTHOR("Noralf Tronnes");
 103 MODULE_LICENSE("GPL");