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 * You should have received a copy of the GNU General Public License
  17 * along with this program; if not, write to the Free Software
  18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19 */
  20
  21#include <linux/module.h>
  22#include <linux/kernel.h>
  23#include <linux/init.h>
  24
  25#include "fbtft.h"
  26
  27#define DRVNAME         "fb_ili9486"
  28#define WIDTH           320
  29#define HEIGHT          480
  30
  31
  32/* this init sequence matches PiScreen */
  33static int default_init_sequence[] = {
  34        /* Interface Mode Control */
  35        -1, 0xb0, 0x0,
  36        /* Sleep OUT */
  37        -1, 0x11,
  38        -2, 250,
  39        /* Interface Pixel Format */
  40        -1, 0x3A, 0x55,
  41        /* Power Control 3 */
  42        -1, 0xC2, 0x44,
  43        /* VCOM Control 1 */
  44        -1, 0xC5, 0x00, 0x00, 0x00, 0x00,
  45        /* PGAMCTRL(Positive Gamma Control) */
  46        -1, 0xE0, 0x0F, 0x1F, 0x1C, 0x0C, 0x0F, 0x08, 0x48, 0x98,
  47                  0x37, 0x0A, 0x13, 0x04, 0x11, 0x0D, 0x00,
  48        /* NGAMCTRL(Negative Gamma Control) */
  49        -1, 0xE1, 0x0F, 0x32, 0x2E, 0x0B, 0x0D, 0x05, 0x47, 0x75,
  50                  0x37, 0x06, 0x10, 0x03, 0x24, 0x20, 0x00,
  51        /* Digital Gamma Control 1 */
  52        -1, 0xE2, 0x0F, 0x32, 0x2E, 0x0B, 0x0D, 0x05, 0x47, 0x75,
  53                  0x37, 0x06, 0x10, 0x03, 0x24, 0x20, 0x00,
  54        /* Sleep OUT */
  55        -1, 0x11,
  56        /* Display ON */
  57        -1, 0x29,
  58        /* end marker */
  59        -3
  60};
  61
  62static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
  63{
  64        fbtft_par_dbg(DEBUG_SET_ADDR_WIN, par,
  65                "%s(xs=%d, ys=%d, xe=%d, ye=%d)\n", __func__, xs, ys, xe, ye);
  66
  67        /* Column address */
  68        write_reg(par, 0x2A, xs >> 8, xs & 0xFF, xe >> 8, xe & 0xFF);
  69
  70        /* Row address */
  71        write_reg(par, 0x2B, ys >> 8, ys & 0xFF, ye >> 8, ye & 0xFF);
  72
  73        /* Memory write */
  74        write_reg(par, 0x2C);
  75}
  76
  77static int set_var(struct fbtft_par *par)
  78{
  79        fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__);
  80
  81        switch (par->info->var.rotate) {
  82        case 0:
  83                write_reg(par, 0x36, 0x80 | (par->bgr << 3));
  84                break;
  85        case 90:
  86                write_reg(par, 0x36, 0x20 | (par->bgr << 3));
  87                break;
  88        case 180:
  89                write_reg(par, 0x36, 0x40 | (par->bgr << 3));
  90                break;
  91        case 270:
  92                write_reg(par, 0x36, 0xE0 | (par->bgr << 3));
  93                break;
  94        default:
  95                break;
  96        }
  97
  98        return 0;
  99}
 100
 101
 102static struct fbtft_display display = {
 103        .regwidth = 8,
 104        .width = WIDTH,
 105        .height = HEIGHT,
 106        .init_sequence = default_init_sequence,
 107        .fbtftops = {
 108                .set_addr_win = set_addr_win,
 109                .set_var = set_var,
 110        },
 111};
 112FBTFT_REGISTER_DRIVER(DRVNAME, "ilitek,ili9486", &display);
 113
 114MODULE_ALIAS("spi:" DRVNAME);
 115MODULE_ALIAS("platform:" DRVNAME);
 116MODULE_ALIAS("spi:ili9486");
 117MODULE_ALIAS("platform:ili9486");
 118
 119MODULE_DESCRIPTION("FB driver for the ILI9486 LCD Controller");
 120MODULE_AUTHOR("Noralf Tronnes");
 121MODULE_LICENSE("GPL");
 122