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/* | ||
* 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. | ||
*/ | ||
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#include <linux/module.h> | ||
#include <linux/kernel.h> | ||
#include <linux/init.h> | ||
#include <linux/gpio.h> | ||
#include <linux/delay.h> | ||
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#include "fbtft.h" | ||
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#define DRVNAME "fb_ili9340" | ||
#define WIDTH 240 | ||
#define HEIGHT 320 | ||
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/* 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__); | ||
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par->fbtftops.reset(par); | ||
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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); | ||
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/* Power Control 1 */ | ||
write_reg(par, 0xC0, 0x23); | ||
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/* Power Control 2 */ | ||
write_reg(par, 0xC1, 0x10); | ||
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/* VCOM Control 1 */ | ||
write_reg(par, 0xC5, 0x3e, 0x28); | ||
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/* VCOM Control 2 */ | ||
write_reg(par, 0xC7, 0x86); | ||
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/* COLMOD: Pixel Format Set */ | ||
/* 16 bits/pixel */ | ||
write_reg(par, 0x3A, 0x55); | ||
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/* Frame Rate Control */ | ||
/* Division ratio = fosc, Frame Rate = 79Hz */ | ||
write_reg(par, 0xB1, 0x00, 0x18); | ||
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/* Display Function Control */ | ||
write_reg(par, 0xB6, 0x08, 0x82, 0x27); | ||
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/* Gamma Function Disable */ | ||
write_reg(par, 0xF2, 0x00); | ||
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/* Gamma curve selected */ | ||
write_reg(par, 0x26, 0x01); | ||
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/* Positive Gamma Correction */ | ||
write_reg(par, 0xE0, | ||
0x0F, 0x31, 0x2B, 0x0C, 0x0E, 0x08, 0x4E, 0xF1, | ||
0x37, 0x07, 0x10, 0x03, 0x0E, 0x09, 0x00); | ||
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/* Negative Gamma Correction */ | ||
write_reg(par, 0xE1, | ||
0x00, 0x0E, 0x14, 0x03, 0x11, 0x07, 0x31, 0xC1, | ||
0x48, 0x08, 0x0F, 0x0C, 0x31, 0x36, 0x0F); | ||
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/* Sleep OUT */ | ||
write_reg(par, 0x11); | ||
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mdelay(120); | ||
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/* Display ON */ | ||
write_reg(par, 0x29); | ||
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return 0; | ||
} | ||
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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); | ||
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/* Column address */ | ||
write_reg(par, 0x2A, xs >> 8, xs & 0xFF, xe >> 8, xe & 0xFF); | ||
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/* Row adress */ | ||
write_reg(par, 0x2B, ys >> 8, ys & 0xFF, ye >> 8, ye & 0xFF); | ||
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/* Memory write */ | ||
write_reg(par, 0x2C); | ||
} | ||
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#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; | ||
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fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__); | ||
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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)); | ||
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return 0; | ||
} | ||
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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); | ||
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MODULE_ALIAS("spi:" DRVNAME); | ||
MODULE_ALIAS("platform:" DRVNAME); | ||
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MODULE_DESCRIPTION("FB driver for the ILI9340 LCD Controller"); | ||
MODULE_AUTHOR("Noralf Tronnes"); | ||
MODULE_LICENSE("GPL"); |
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