fb_ili9486.c

/*
 * FB driver for the ILI9486 LCD Controller
 *
 * Copyright (C) 2014 Noralf Tronnes
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>

#include "fbtft.h"

#define DRVNAME		"fb_ili9486"
#define WIDTH		320
#define HEIGHT		480


/* this init sequence matches PiScreen */
static int default_init_sequence[] = {
	/* Interface Mode Control */
	-1, 0xb0, 0x0,
	/* Sleep OUT */
	-1, 0x11,
	-2, 250,
	/* Interface Pixel Format */
	-1, 0x3A, 0x55,
	/* Power Control 3 */
	-1, 0xC2, 0x44,
	/* VCOM Control 1 */
	-1, 0xC5, 0x00, 0x00, 0x00, 0x00,
	/* PGAMCTRL(Positive Gamma Control) */
	-1, 0xE0, 0x0F, 0x1F, 0x1C, 0x0C, 0x0F, 0x08, 0x48, 0x98,
	          0x37, 0x0A, 0x13, 0x04, 0x11, 0x0D, 0x00,
	/* NGAMCTRL(Negative Gamma Control) */
	-1, 0xE1, 0x0F, 0x32, 0x2E, 0x0B, 0x0D, 0x05, 0x47, 0x75,
	          0x37, 0x06, 0x10, 0x03, 0x24, 0x20, 0x00,
	/* Digital Gamma Control 1 */
	-1, 0xE2, 0x0F, 0x32, 0x2E, 0x0B, 0x0D, 0x05, 0x47, 0x75,
	          0x37, 0x06, 0x10, 0x03, 0x24, 0x20, 0x00,
	/* Sleep OUT */
	-1, 0x11,
	/* Display ON */
	-1, 0x29,
	/* end marker */
	-3
};

static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
{
	fbtft_par_dbg(DEBUG_SET_ADDR_WIN, par,
		"%s(xs=%d, ys=%d, xe=%d, ye=%d)\n", __func__, xs, ys, xe, ye);

	/* Column address */
	write_reg(par, 0x2A, xs >> 8, xs & 0xFF, xe >> 8, xe & 0xFF);

	/* Row adress */
	write_reg(par, 0x2B, ys >> 8, ys & 0xFF, ye >> 8, ye & 0xFF);

	/* Memory write */
	write_reg(par, 0x2C);
}

static int set_var(struct fbtft_par *par)
{
	fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__);

	switch (par->info->var.rotate) {
	case 0:
		write_reg(par, 0x36, 0x80 | (par->bgr << 3));
		break;
	case 90:
		write_reg(par, 0x36, 0x20 | (par->bgr << 3));
		break;
	case 180:
		write_reg(par, 0x36, 0x40 | (par->bgr << 3));
		break;
	case 270:
		write_reg(par, 0x36, 0xE0 | (par->bgr << 3));
		break;
	default:
		break;
	}

	return 0;
}


static struct fbtft_display display = {
	.regwidth = 8,
	.width = WIDTH,
	.height = HEIGHT,
	.init_sequence = default_init_sequence,
	.fbtftops = {
		.set_addr_win = set_addr_win,
		.set_var = set_var,
	},
};
FBTFT_REGISTER_DRIVER(DRVNAME, "ilitek,ili9486", &display);

MODULE_ALIAS("spi:" DRVNAME);
MODULE_ALIAS("platform:" DRVNAME);
MODULE_ALIAS("spi:ili9486");
MODULE_ALIAS("platform:ili9486");

MODULE_DESCRIPTION("FB driver for the ILI9486 LCD Controller");
MODULE_AUTHOR("Noralf Tronnes");
MODULE_LICENSE("GPL");