LXR linux/drivers/staging/fbtft/fb

   1/*
   2 * FB driver for the ILI9486 LCD Controller
   3 *
   4 * Copyright (C) 2014 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 <video/mipi_display.h>
  21
  22#include "fbtft.h"
  23
  24#define DRVNAME         "fb_ili9486"
  25#define WIDTH           320
  26#define HEIGHT          480
  27
  28/* this init sequence matches PiScreen */
  29static const s16 default_init_sequence[] = {
  30        /* Interface Mode Control */
  31        -1, 0xb0, 0x0,
  32        -1, MIPI_DCS_EXIT_SLEEP_MODE,
  33        -2, 250,
  34        /* Interface Pixel Format */
  35        -1, MIPI_DCS_SET_PIXEL_FORMAT, 0x55,
  36        /* Power Control 3 */
  37        -1, 0xC2, 0x44,
  38        /* VCOM Control 1 */
  39        -1, 0xC5, 0x00, 0x00, 0x00, 0x00,
  40        /* PGAMCTRL(Positive Gamma Control) */
  41        -1, 0xE0, 0x0F, 0x1F, 0x1C, 0x0C, 0x0F, 0x08, 0x48, 0x98,
  42                  0x37, 0x0A, 0x13, 0x04, 0x11, 0x0D, 0x00,
  43        /* NGAMCTRL(Negative Gamma Control) */
  44        -1, 0xE1, 0x0F, 0x32, 0x2E, 0x0B, 0x0D, 0x05, 0x47, 0x75,
  45                  0x37, 0x06, 0x10, 0x03, 0x24, 0x20, 0x00,
  46        /* Digital Gamma Control 1 */
  47        -1, 0xE2, 0x0F, 0x32, 0x2E, 0x0B, 0x0D, 0x05, 0x47, 0x75,
  48                  0x37, 0x06, 0x10, 0x03, 0x24, 0x20, 0x00,
  49        -1, MIPI_DCS_EXIT_SLEEP_MODE,
  50        -1, MIPI_DCS_SET_DISPLAY_ON,
  51        /* end marker */
  52        -3
  53};
  54
  55static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
  56{
  57        write_reg(par, MIPI_DCS_SET_COLUMN_ADDRESS,
  58                  xs >> 8, xs & 0xFF, xe >> 8, xe & 0xFF);
  59
  60        write_reg(par, MIPI_DCS_SET_PAGE_ADDRESS,
  61                  ys >> 8, ys & 0xFF, ye >> 8, ye & 0xFF);
  62
  63        write_reg(par, MIPI_DCS_WRITE_MEMORY_START);
  64}
  65
  66static int set_var(struct fbtft_par *par)
  67{
  68        switch (par->info->var.rotate) {
  69        case 0:
  70                write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
  71                          0x80 | (par->bgr << 3));
  72                break;
  73        case 90:
  74                write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
  75                          0x20 | (par->bgr << 3));
  76                break;
  77        case 180:
  78                write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
  79                          0x40 | (par->bgr << 3));
  80                break;
  81        case 270:
  82                write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
  83                          0xE0 | (par->bgr << 3));
  84                break;
  85        default:
  86                break;
  87        }
  88
  89        return 0;
  90}
  91
  92static struct fbtft_display display = {
  93        .regwidth = 8,
  94        .width = WIDTH,
  95        .height = HEIGHT,
  96        .init_sequence = default_init_sequence,
  97        .fbtftops = {
  98                .set_addr_win = set_addr_win,
  99                .set_var = set_var,
 100        },
 101};
 102
 103FBTFT_REGISTER_DRIVER(DRVNAME, "ilitek,ili9486", &display);
 104
 105MODULE_ALIAS("spi:" DRVNAME);
 106MODULE_ALIAS("platform:" DRVNAME);
 107MODULE_ALIAS("spi:ili9486");
 108MODULE_ALIAS("platform:ili9486");
 109
 110MODULE_DESCRIPTION("FB driver for the ILI9486 LCD Controller");
 111MODULE_AUTHOR("Noralf Tronnes");
 112MODULE_LICENSE("GPL");
 113