drivers/staging/fbtft/fb_tinylcd.c

   1 /*
   2  * Custom FB driver for tinylcd.com display
   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/delay.h>
  21 #include <video/mipi_display.h>
  22
  23 #include "fbtft.h"
  24
  25 #define DRVNAME         "fb_tinylcd"
  26 #define WIDTH           320
  27 #define HEIGHT          480
  28
  29 static int init_display(struct fbtft_par *par)
  30 {
  31         par->fbtftops.reset(par);
  32
  33         write_reg(par, 0xB0, 0x80);
  34         write_reg(par, 0xC0, 0x0A, 0x0A);
  35         write_reg(par, 0xC1, 0x45, 0x07);
  36         write_reg(par, 0xC2, 0x33);
  37         write_reg(par, 0xC5, 0x00, 0x42, 0x80);
  38         write_reg(par, 0xB1, 0xD0, 0x11);
  39         write_reg(par, 0xB4, 0x02);
  40         write_reg(par, 0xB6, 0x00, 0x22, 0x3B);
  41         write_reg(par, 0xB7, 0x07);
  42         write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, 0x58);
  43         write_reg(par, 0xF0, 0x36, 0xA5, 0xD3);
  44         write_reg(par, 0xE5, 0x80);
  45         write_reg(par, 0xE5, 0x01);
  46         write_reg(par, 0xB3, 0x00);
  47         write_reg(par, 0xE5, 0x00);
  48         write_reg(par, 0xF0, 0x36, 0xA5, 0x53);
  49         write_reg(par, 0xE0, 0x00, 0x35, 0x33, 0x00, 0x00, 0x00,
  50                              0x00, 0x35, 0x33, 0x00, 0x00, 0x00);
  51         write_reg(par, MIPI_DCS_SET_PIXEL_FORMAT, 0x55);
  52         write_reg(par, MIPI_DCS_EXIT_SLEEP_MODE);
  53         udelay(250);
  54         write_reg(par, MIPI_DCS_SET_DISPLAY_ON);
  55
  56         return 0;
  57 }
  58
  59 static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
  60 {
  61         write_reg(par, MIPI_DCS_SET_COLUMN_ADDRESS,
  62                   xs >> 8, xs & 0xFF, xe >> 8, xe & 0xFF);
  63
  64         write_reg(par, MIPI_DCS_SET_PAGE_ADDRESS,
  65                   ys >> 8, ys & 0xFF, ye >> 8, ye & 0xFF);
  66
  67         write_reg(par, MIPI_DCS_WRITE_MEMORY_START);
  68 }
  69
  70 static int set_var(struct fbtft_par *par)
  71 {
  72         switch (par->info->var.rotate) {
  73         case 270:
  74                 write_reg(par, 0xB6, 0x00, 0x02, 0x3B);
  75                 write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, 0x28);
  76                 break;
  77         case 180:
  78                 write_reg(par, 0xB6, 0x00, 0x22, 0x3B);
  79                 write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, 0x58);
  80                 break;
  81         case 90:
  82                 write_reg(par, 0xB6, 0x00, 0x22, 0x3B);
  83                 write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, 0x38);
  84                 break;
  85         default:
  86                 write_reg(par, 0xB6, 0x00, 0x22, 0x3B);
  87                 write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, 0x08);
  88                 break;
  89         }
  90
  91         return 0;
  92 }
  93
  94 static struct fbtft_display display = {
  95         .regwidth = 8,
  96         .width = WIDTH,
  97         .height = HEIGHT,
  98         .fbtftops = {
  99                 .init_display = init_display,
 100                 .set_addr_win = set_addr_win,
 101                 .set_var = set_var,
 102         },
 103 };
 104
 105 FBTFT_REGISTER_DRIVER(DRVNAME, "neosec,tinylcd", &display);
 106
 107 MODULE_ALIAS("spi:" DRVNAME);
 108 MODULE_ALIAS("spi:tinylcd");
 109
 110 MODULE_DESCRIPTION("Custom FB driver for tinylcd.com display");
 111 MODULE_AUTHOR("Noralf Tronnes");
 112 MODULE_LICENSE("GPL");