Release 4.7 drivers/staging/fbtft/fb_upd161704.c

Directory: drivers/staging/fbtft
/*
 * FB driver for the uPD161704 LCD Controller
 *
 * Copyright (C) 2014 Seong-Woo Kim
 *
 * Based on fb_ili9325.c by Noralf Tronnes
 * Based on ili9325.c by Jeroen Domburg
 * Init code from UTFT library by Henning Karlsen
 *
 * 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.
 */

#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_upd161704"

#define WIDTH		240

#define HEIGHT		320

#define BPP		16



static int init_display(struct fbtft_par *par)
{
	par->fbtftops.reset(par);

	if (par->gpio.cs != -1)
		gpio_set_value(par->gpio.cs, 0);  /* Activate chip */

	/* Initialization sequence from Lib_UTFT */

	/* register reset */
	write_reg(par, 0x0003, 0x0001);	/* Soft reset */

	/* oscillator start */
	write_reg(par, 0x003A, 0x0001);	/*Oscillator 0: stop, 1: operation */
	udelay(100);

	/* y-setting */
	write_reg(par, 0x0024, 0x007B);	/* amplitude setting */
	udelay(10);
	write_reg(par, 0x0025, 0x003B);	/* amplitude setting */
	write_reg(par, 0x0026, 0x0034);	/* amplitude setting */
	udelay(10);
	write_reg(par, 0x0027, 0x0004);	/* amplitude setting */
	write_reg(par, 0x0052, 0x0025);	/* circuit setting 1 */
	udelay(10);
	write_reg(par, 0x0053, 0x0033);	/* circuit setting 2 */
	write_reg(par, 0x0061, 0x001C);	/* adjustment V10 positive polarity */
	udelay(10);
	write_reg(par, 0x0062, 0x002C);	/* adjustment V9 negative polarity */
	write_reg(par, 0x0063, 0x0022);	/* adjustment V34 positive polarity */
	udelay(10);
	write_reg(par, 0x0064, 0x0027);	/* adjustment V31 negative polarity */
	udelay(10);
	write_reg(par, 0x0065, 0x0014);	/* adjustment V61 negative polarity */
	udelay(10);
	write_reg(par, 0x0066, 0x0010);	/* adjustment V61 negative polarity */

	/* Basical clock for 1 line (BASECOUNT[7:0]) number specified */
	write_reg(par, 0x002E, 0x002D);

	/* Power supply setting */
	write_reg(par, 0x0019, 0x0000);	/* DC/DC output setting */
	udelay(200);
	write_reg(par, 0x001A, 0x1000);	/* DC/DC frequency setting */
	write_reg(par, 0x001B, 0x0023);	/* DC/DC rising setting */
	write_reg(par, 0x001C, 0x0C01);	/* Regulator voltage setting */
	write_reg(par, 0x001D, 0x0000);	/* Regulator current setting */
	write_reg(par, 0x001E, 0x0009);	/* VCOM output setting */
	write_reg(par, 0x001F, 0x0035);	/* VCOM amplitude setting */
	write_reg(par, 0x0020, 0x0015);	/* VCOMM cencter setting */
	write_reg(par, 0x0018, 0x1E7B);	/* DC/DC operation setting */

	/* windows setting */
	write_reg(par, 0x0008, 0x0000);	/* Minimum X address */
	write_reg(par, 0x0009, 0x00EF);	/* Maximum X address */
	write_reg(par, 0x000a, 0x0000);	/* Minimum Y address */
	write_reg(par, 0x000b, 0x013F);	/* Maximum Y address */

	/* LCD display area setting */
	write_reg(par, 0x0029, 0x0000);	/* [LCDSIZE]  X MIN. size set */
	write_reg(par, 0x002A, 0x0000);	/* [LCDSIZE]  Y MIN. size set */
	write_reg(par, 0x002B, 0x00EF);	/* [LCDSIZE]  X MAX. size set */
	write_reg(par, 0x002C, 0x013F);	/* [LCDSIZE]  Y MAX. size set */

	/* Gate scan setting */
	write_reg(par, 0x0032, 0x0002);

	/* n line inversion line number */
	write_reg(par, 0x0033, 0x0000);

	/* Line inversion/frame inversion/interlace setting */
	write_reg(par, 0x0037, 0x0000);

	/* Gate scan operation setting register */
	write_reg(par, 0x003B, 0x0001);

	/* Color mode */
	/*GS = 0: 260-k color (64 gray scale), GS = 1: 8 color (2 gray scale) */
	write_reg(par, 0x0004, 0x0000);

	/* RAM control register */
	write_reg(par, 0x0005, 0x0000);	/*Window access 00:Normal, 10:Window */

	/* Display setting register 2 */
	write_reg(par, 0x0001, 0x0000);

	/* display setting */
	write_reg(par, 0x0000, 0x0000);	/* display on */

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
thomas petazzoni thomas petazzoni 501 100.00% 1 100.00%
Total 501 100.00% 1 100.00%



static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
{
	switch (par->info->var.rotate) {
	/* R20h = Horizontal GRAM Start Address */
	/* R21h = Vertical GRAM Start Address */
	case 0:
		write_reg(par, 0x0006, xs);
		write_reg(par, 0x0007, ys);
		break;
	case 180:
		write_reg(par, 0x0006, WIDTH - 1 - xs);
		write_reg(par, 0x0007, HEIGHT - 1 - ys);
		break;
	case 270:
		write_reg(par, 0x0006, WIDTH - 1 - ys);
		write_reg(par, 0x0007, xs);
		break;
	case 90:
		write_reg(par, 0x0006, ys);
		write_reg(par, 0x0007, HEIGHT - 1 - xs);
		break;
	}

	write_reg(par, 0x0e); /* Write Data to GRAM */
}

Contributors
Person Tokens Prop Commits CommitProp
thomas petazzoni thomas petazzoni 149 100.00% 1 100.00%
Total 149 100.00% 1 100.00%



static int set_var(struct fbtft_par *par)
{
	switch (par->info->var.rotate) {
	/* AM: GRAM update direction */
	case 0:
		write_reg(par, 0x01, 0x0000);
		write_reg(par, 0x05, 0x0000);
		break;
	case 180:
		write_reg(par, 0x01, 0x00C0);
		write_reg(par, 0x05, 0x0000);
		break;
	case 270:
		write_reg(par, 0x01, 0x0080);
		write_reg(par, 0x05, 0x0001);
		break;
	case 90:
		write_reg(par, 0x01, 0x0040);
		write_reg(par, 0x05, 0x0001);
		break;
	}

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
thomas petazzoni thomas petazzoni 115 100.00% 1 100.00%
Total 115 100.00% 1 100.00%


static struct fbtft_display display = {
	.regwidth = 16,
	.width = WIDTH,
	.height = HEIGHT,
	.fbtftops = {
		.init_display = init_display,
		.set_addr_win = set_addr_win,
		.set_var = set_var,
        },
};

FBTFT_REGISTER_DRIVER(DRVNAME, "nec,upd161704", &display);

MODULE_ALIAS("spi:" DRVNAME);
MODULE_ALIAS("platform:" DRVNAME);
MODULE_ALIAS("spi:upd161704");
MODULE_ALIAS("platform:upd161704");

MODULE_DESCRIPTION("FB driver for the uPD161704 LCD Controller");
MODULE_AUTHOR("Seong-Woo Kim");
MODULE_LICENSE("GPL");
Overall Contributors
Person Tokens Prop Commits CommitProp
thomas petazzoni thomas petazzoni 888 99.89% 1 50.00%
anish bhatt anish bhatt 1 0.11% 1 50.00%
Total 889 100.00% 2 100.00%
  Directory: drivers/staging/fbtft

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
	Person	Tokens	Prop	Commits	CommitProp
thomas petazzoni	thomas petazzoni	501	100.00%	1	100.00%
	Total	501	100.00%	1	100.00%
cregit-Linux how code gets into the kernel

Release 4.7 drivers/staging/fbtft/fb_upd161704.c

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