--- /dev/null
+/*
+ * FB driver for the HX8347D LCD Controller
+ *
+ * Copyright (C) 2013 Christian Vogelgsang
+ *
+ * Based on driver code found here: https://github.com/watterott/r61505u-Adapter
+ *
+ * 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/delay.h>
+
+#include "fbtft.h"
+
+#define DRVNAME "fb_hx8347d"
+#define WIDTH 320
+#define HEIGHT 240
+#define DEFAULT_GAMMA "0 0 0 0 0 0 0 0 0 0 0 0 0 0\n" \
+ "0 0 0 0 0 0 0 0 0 0 0 0 0 0"
+
+
+static int init_display(struct fbtft_par *par)
+{
+ fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__);
+
+ par->fbtftops.reset(par);
+
+ /* driving ability */
+ write_reg(par, 0xEA, 0x00);
+ write_reg(par, 0xEB, 0x20);
+ write_reg(par, 0xEC, 0x0C);
+ write_reg(par, 0xED, 0xC4);
+ write_reg(par, 0xE8, 0x40);
+ write_reg(par, 0xE9, 0x38);
+ write_reg(par, 0xF1, 0x01);
+ write_reg(par, 0xF2, 0x10);
+ write_reg(par, 0x27, 0xA3);
+
+ /* power voltage */
+ write_reg(par, 0x1B, 0x1B);
+ write_reg(par, 0x1A, 0x01);
+ write_reg(par, 0x24, 0x2F);
+ write_reg(par, 0x25, 0x57);
+
+ /* VCOM offset */
+ write_reg(par, 0x23, 0x8D); /* for flicker adjust */
+
+ /* power on */
+ write_reg(par, 0x18, 0x36);
+ write_reg(par, 0x19, 0x01); /* start osc */
+ write_reg(par, 0x01, 0x00); /* wakeup */
+ write_reg(par, 0x1F, 0x88);
+ mdelay(5);
+ write_reg(par, 0x1F, 0x80);
+ mdelay(5);
+ write_reg(par, 0x1F, 0x90);
+ mdelay(5);
+ write_reg(par, 0x1F, 0xD0);
+ mdelay(5);
+
+ /* color selection */
+ write_reg(par, 0x17, 0x05); /* 65k */
+
+ /*panel characteristic */
+ write_reg(par, 0x36, 0x00);
+
+ /*display on */
+ write_reg(par, 0x28, 0x38);
+ mdelay(40);
+ write_reg(par, 0x28, 0x3C);
+
+ /* orientation */
+ write_reg(par, 0x16, 0x60 | (par->bgr << 3));
+
+ 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);
+
+ write_reg(par, 0x02, (xs >> 8) & 0xFF);
+ write_reg(par, 0x03, xs & 0xFF);
+ write_reg(par, 0x04, (xe >> 8) & 0xFF);
+ write_reg(par, 0x05, xe & 0xFF);
+ write_reg(par, 0x06, (ys >> 8) & 0xFF);
+ write_reg(par, 0x07, ys & 0xFF);
+ write_reg(par, 0x08, (ye >> 8) & 0xFF);
+ write_reg(par, 0x09, ye & 0xFF);
+ write_reg(par, 0x22);
+}
+
+/*
+ Gamma string format:
+ VRP0 VRP1 VRP2 VRP3 VRP4 VRP5 PRP0 PRP1 PKP0 PKP1 PKP2 PKP3 PKP4 CGM
+ VRN0 VRN1 VRN2 VRN3 VRN4 VRN5 PRN0 PRN1 PKN0 PKN1 PKN2 PKN3 PKN4 CGM
+*/
+#define CURVE(num, idx) curves[num*par->gamma.num_values + idx]
+static int set_gamma(struct fbtft_par *par, unsigned long *curves)
+{
+ unsigned long mask[] = {
+ 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x7f, 0x7f, 0x1f, 0x1f,
+ 0x1f, 0x1f, 0x1f, 0x0f,
+ };
+ int i, j;
+ int acc = 0;
+
+ fbtft_par_dbg(DEBUG_INIT_DISPLAY, par, "%s()\n", __func__);
+
+ /* apply mask */
+ for (i = 0; i < par->gamma.num_curves; i++)
+ for (j = 0; j < par->gamma.num_values; j++) {
+ acc += CURVE(i, j);
+ CURVE(i, j) &= mask[j];
+ }
+
+ if (acc == 0) /* skip if all values are zero */
+ return 0;
+
+ for (i = 0; i < par->gamma.num_curves; i++) {
+ write_reg(par, 0x40 + (i * 0x10), CURVE(i, 0));
+ write_reg(par, 0x41 + (i * 0x10), CURVE(i, 1));
+ write_reg(par, 0x42 + (i * 0x10), CURVE(i, 2));
+ write_reg(par, 0x43 + (i * 0x10), CURVE(i, 3));
+ write_reg(par, 0x44 + (i * 0x10), CURVE(i, 4));
+ write_reg(par, 0x45 + (i * 0x10), CURVE(i, 5));
+ write_reg(par, 0x46 + (i * 0x10), CURVE(i, 6));
+ write_reg(par, 0x47 + (i * 0x10), CURVE(i, 7));
+ write_reg(par, 0x48 + (i * 0x10), CURVE(i, 8));
+ write_reg(par, 0x49 + (i * 0x10), CURVE(i, 9));
+ write_reg(par, 0x4A + (i * 0x10), CURVE(i, 10));
+ write_reg(par, 0x4B + (i * 0x10), CURVE(i, 11));
+ write_reg(par, 0x4C + (i * 0x10), CURVE(i, 12));
+ }
+ write_reg(par, 0x5D, (CURVE(1, 0) << 4) | CURVE(0, 0));
+
+ return 0;
+}
+#undef CURVE
+
+
+static struct fbtft_display display = {
+ .regwidth = 8,
+ .width = WIDTH,
+ .height = HEIGHT,
+ .gamma_num = 2,
+ .gamma_len = 14,
+ .gamma = DEFAULT_GAMMA,
+ .fbtftops = {
+ .init_display = init_display,
+ .set_addr_win = set_addr_win,
+ .set_gamma = set_gamma,
+ },
+};
+FBTFT_REGISTER_DRIVER(DRVNAME, "himax,hx8347d", &display);
+
+MODULE_ALIAS("spi:" DRVNAME);
+MODULE_ALIAS("platform:" DRVNAME);
+MODULE_ALIAS("spi:hx8347d");
+MODULE_ALIAS("platform:hx8347d");
+
+MODULE_DESCRIPTION("FB driver for the HX8347D LCD Controller");
+MODULE_AUTHOR("Christian Vogelgsang");
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff