LXR linux/drivers/staging/fbtft/fb

   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
  20static 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
  50static 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
  61static 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
  85static 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
  96FBTFT_REGISTER_DRIVER(DRVNAME, "neosec,tinylcd", &display);
  97
  98MODULE_ALIAS("spi:" DRVNAME);
  99MODULE_ALIAS("spi:tinylcd");
 100
 101MODULE_DESCRIPTION("Custom FB driver for tinylcd.com display");
 102MODULE_AUTHOR("Noralf Tronnes");
 103MODULE_LICENSE("GPL");
 104