/*

* FB driver for the ILI9340 LCD Controller

*

* Copyright (C) 2013 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 <linux/gpio.h>

#include <linux/delay.h>

#include "fbtft.h"

#define DRVNAME "fb_ili9340"

#define WIDTH 240

#define HEIGHT 320

/* Init sequence taken from: Arduino Library for the Adafruit 2.2" display */

static int init_display(struct fbtft_par *par)

{

fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__);

par->fbtftops.reset(par);

write_reg(par, 0xEF, 0x03, 0x80, 0x02);

write_reg(par, 0xCF, 0x00 , 0XC1 , 0X30);

write_reg(par, 0xED, 0x64 , 0x03 , 0X12 , 0X81);

write_reg(par, 0xE8, 0x85 , 0x00 , 0x78);

write_reg(par, 0xCB, 0x39 , 0x2C , 0x00 , 0x34 , 0x02);

write_reg(par, 0xF7, 0x20);

write_reg(par, 0xEA, 0x00 , 0x00);

/* Power Control 1 */

write_reg(par, 0xC0, 0x23);

/* Power Control 2 */

write_reg(par, 0xC1, 0x10);

/* VCOM Control 1 */

write_reg(par, 0xC5, 0x3e, 0x28);

/* VCOM Control 2 */

write_reg(par, 0xC7, 0x86);

/* COLMOD: Pixel Format Set */

/* 16 bits/pixel */

write_reg(par, 0x3A, 0x55);

/* Frame Rate Control */

/* Division ratio = fosc, Frame Rate = 79Hz */

write_reg(par, 0xB1, 0x00, 0x18);

/* Display Function Control */

write_reg(par, 0xB6, 0x08, 0x82, 0x27);

/* Gamma Function Disable */

write_reg(par, 0xF2, 0x00);

/* Gamma curve selected */

write_reg(par, 0x26, 0x01);

/* Positive Gamma Correction */

write_reg(par, 0xE0,

0x0F, 0x31, 0x2B, 0x0C, 0x0E, 0x08, 0x4E, 0xF1,

0x37, 0x07, 0x10, 0x03, 0x0E, 0x09, 0x00);

/* Negative Gamma Correction */

write_reg(par, 0xE1,

0x00, 0x0E, 0x14, 0x03, 0x11, 0x07, 0x31, 0xC1,

0x48, 0x08, 0x0F, 0x0C, 0x31, 0x36, 0x0F);

/* Sleep OUT */

write_reg(par, 0x11);

mdelay(120);

/* Display ON */

write_reg(par, 0x29);

return 0;

}

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);

}

#define ILI9340_MADCTL_MV 0x20

#define ILI9340_MADCTL_MX 0x40

#define ILI9340_MADCTL_MY 0x80

static int set_var(struct fbtft_par *par)

{

u8 val;

fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__);

switch (par->info->var.rotate) {

case 270:

val = ILI9340_MADCTL_MV;

break;

case 180:

val = ILI9340_MADCTL_MY;

break;

case 90:

val = ILI9340_MADCTL_MV | ILI9340_MADCTL_MY | ILI9340_MADCTL_MX;

break;

default:

val = ILI9340_MADCTL_MX;

break;

}

/* Memory Access Control */

write_reg(par, 0x36, val | (par->bgr << 3));

return 0;

}

static struct fbtft_display display = {

.regwidth = 8,

.width = WIDTH,

.height = HEIGHT,

.fbtftops = {

.init_display = init_display,

.set_addr_win = set_addr_win,

.set_var = set_var,

},

};

FBTFT_REGISTER_DRIVER(DRVNAME, &display);

MODULE_ALIAS("spi:" DRVNAME);

MODULE_ALIAS("platform:" DRVNAME);

MODULE_DESCRIPTION("FB driver for the ILI9340 LCD Controller");

MODULE_AUTHOR("Noralf Tronnes");

MODULE_LICENSE("GPL");