--- /dev/null
+/*
+ * 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.
+ *
+ * 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_upd161704"
+#define WIDTH 240
+#define HEIGHT 320
+#define BPP 16
+
+static int init_display(struct fbtft_par *par)
+{
+ fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__);
+
+ 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;
+}
+
+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);
+ 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 */
+}
+
+static int set_var(struct fbtft_par *par)
+{
+ fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__);
+
+ 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;
+}
+
+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");
Code Review / kvmfornfv.git / blobdiff