fb_tinylcd.c

  1// SPDX-License-Identifier: GPL-2.0+
  2/*
  3 * Custom FB driver for tinylcd.com display
  4 *
  5 * Copyright (C) 2013 Noralf Tronnes
  6 */
  7
  8#include <linux/module.h>
  9#include <linux/kernel.h>
 10#include <linux/init.h>
 11#include <linux/delay.h>
 12#include <video/mipi_display.h>
 13
 14#include "fbtft.h"
 15
 16#define DRVNAME		"fb_tinylcd"
 17#define WIDTH		320
 18#define HEIGHT		480
 19
 20static int init_display(struct fbtft_par *par)
 21{
 22	par->fbtftops.reset(par);
 23
 24	write_reg(par, 0xB0, 0x80);
 25	write_reg(par, 0xC0, 0x0A, 0x0A);
 26	write_reg(par, 0xC1, 0x45, 0x07);
 27	write_reg(par, 0xC2, 0x33);
 28	write_reg(par, 0xC5, 0x00, 0x42, 0x80);
 29	write_reg(par, 0xB1, 0xD0, 0x11);
 30	write_reg(par, 0xB4, 0x02);
 31	write_reg(par, 0xB6, 0x00, 0x22, 0x3B);
 32	write_reg(par, 0xB7, 0x07);
 33	write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, 0x58);
 34	write_reg(par, 0xF0, 0x36, 0xA5, 0xD3);
 35	write_reg(par, 0xE5, 0x80);
 36	write_reg(par, 0xE5, 0x01);
 37	write_reg(par, 0xB3, 0x00);
 38	write_reg(par, 0xE5, 0x00);
 39	write_reg(par, 0xF0, 0x36, 0xA5, 0x53);
 40	write_reg(par, 0xE0, 0x00, 0x35, 0x33, 0x00, 0x00, 0x00,
 41		       0x00, 0x35, 0x33, 0x00, 0x00, 0x00);
 42	write_reg(par, MIPI_DCS_SET_PIXEL_FORMAT, 0x55);
 43	write_reg(par, MIPI_DCS_EXIT_SLEEP_MODE);
 44	udelay(250);
 45	write_reg(par, MIPI_DCS_SET_DISPLAY_ON);
 46
 47	return 0;
 48}
 49
 50static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
 51{
 52	write_reg(par, MIPI_DCS_SET_COLUMN_ADDRESS,
 53		  xs >> 8, xs & 0xFF, xe >> 8, xe & 0xFF);
 54
 55	write_reg(par, MIPI_DCS_SET_PAGE_ADDRESS,
 56		  ys >> 8, ys & 0xFF, ye >> 8, ye & 0xFF);
 57
 58	write_reg(par, MIPI_DCS_WRITE_MEMORY_START);
 59}
 60
 61static int set_var(struct fbtft_par *par)
 62{
 63	switch (par->info->var.rotate) {
 64	case 270:
 65		write_reg(par, 0xB6, 0x00, 0x02, 0x3B);
 66		write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, 0x28);
 67		break;
 68	case 180:
 69		write_reg(par, 0xB6, 0x00, 0x22, 0x3B);
 70		write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, 0x58);
 71		break;
 72	case 90:
 73		write_reg(par, 0xB6, 0x00, 0x22, 0x3B);
 74		write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, 0x38);
 75		break;
 76	default:
 77		write_reg(par, 0xB6, 0x00, 0x22, 0x3B);
 78		write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, 0x08);
 79		break;
 80	}
 81
 82	return 0;
 83}
 84
 85static struct fbtft_display display = {
 86	.regwidth = 8,
 87	.width = WIDTH,
 88	.height = HEIGHT,
 89	.fbtftops = {
 90		.init_display = init_display,
 91		.set_addr_win = set_addr_win,
 92		.set_var = set_var,
 93	},
 94};
 95
 96FBTFT_REGISTER_DRIVER(DRVNAME, "neosec,tinylcd", &display);
 97
 98MODULE_ALIAS("spi:" DRVNAME);
 99MODULE_ALIAS("spi:tinylcd");
100
101MODULE_DESCRIPTION("Custom FB driver for tinylcd.com display");
102MODULE_AUTHOR("Noralf Tronnes");
103MODULE_LICENSE("GPL");