From 888154172ac00710a5f792a56c7b8e82377160ad Mon Sep 17 00:00:00 2001
From: Jakob Kaivo <jakob@kaivo.net>
Date: Mon, 12 Nov 2018 10:42:23 -0500
Subject: further progress

---
 fb.c | 147 ++++++++++++++++++++++++++++++++++++++++---------------------------
 1 file changed, 88 insertions(+), 59 deletions(-)

diff --git a/fb.c b/fb.c
index d745698..df2674e 100644
--- a/fb.c
+++ b/fb.c
@@ -1,65 +1,73 @@
 #include <fcntl.h>
 #include <limits.h>
 #include <stdio.h>
+#include <stdint.h>
 #include <string.h>
 #include <sys/mman.h>
 #include <unistd.h>
 
-#include <linux/fb.h>
+#include <linux/mxcfb.h>
 #include <sys/ioctl.h>
 
 #include "fb.h"
 #include "gpio.h"
 
-struct imx_epdc_fb_mode {
-	struct fb_videomode *vmode;
-	int vscan_holdoff;
-	int sdoed_width;
-	int sdoed_delay;
-	int sdoez_width;
-	int sdoez_delay;
-	int gdclk_hp_offs;
-	int gdsp_offs;
-	int gdoe_offs;
-	int gdclk_offs;
-	int num_ce;
-};
-
-static unsigned char *fbaddr;
-static struct fb_fix_screeninfo fsi;
-static struct fb_var_screeninfo vsi;
-
-static void dumpvsi(const char *ctl, int io)
+static struct {
+	int fd;
+	unsigned char *addr;
+	struct fb_fix_screeninfo fsi;
+	struct fb_var_screeninfo vsi;
+	size_t size;
+} fb;
+
+static void fb_update(int x, int y, int w, int h)
 {
-	printf("- %s\n", ctl);
-	printf("\tioctl returned %d\n", io);
-	printf("\txres: %d\n", vsi.xres);
-	printf("\tyres: %d\n", vsi.yres);
-	printf("\txres_virtual: %d\n", vsi.xres_virtual);
-	printf("\tyres_virtual: %d\n", vsi.yres_virtual);
-	printf("\txoffset: %d\n", vsi.xoffset);
-	printf("\tyoffset: %d\n", vsi.yoffset);
-	printf("\tbits_per_pixel: %d\n", vsi.bits_per_pixel);
-	printf("\tgrayscale: %d\n", vsi.grayscale);
+	static int marker = 0;
+	marker++;
+
+	struct mxcfb_update_data data = {
+		.update_mode = UPDATE_MODE_PARTIAL,
+		.waveform_mode = WAVEFORM_MODE_AUTO, /* DU? */
+		.update_region.left = x,
+		.update_region.top = y,
+		.update_region.width = w,
+		.update_region.height = h,
+		.update_marker = marker,
+		.temp = TEMP_USE_AMBIENT,
+		.flags = 0,
+	};
+	ioctl(fb.fd, MXCFB_SEND_UPDATE, &data);
+
+	struct mxcfb_update_marker_data md = {
+		.update_marker = marker,
+	};
+
+	ioctl(fb.fd, MXCFB_WAIT_FOR_UPDATE_COMPLETE, &md);
 }
 
-static void dumpfsi(const char *ctl, int io)
+static void fb_blank(void)
 {
-	printf("- %s\n", ctl);
-	printf("\tioctl returned %d\n", io);
-	printf("\tid: %16s\n", fsi.id);
-	printf("\tsmem_len: %d\n", fsi.smem_len);
-	printf("\ttype: %d\n", fsi.type);
-	printf("\ttype_aux: %d\n", fsi.type_aux);
-	printf("\tvisual: %d\n", fsi.visual);
-	printf("\txpanstep: %d\n", fsi.xpanstep);
-	printf("\typanstep: %d\n", fsi.ypanstep);
-	printf("\tywrapstep: %d\n", fsi.ywrapstep);
-	printf("\tline_length: %d\n", fsi.line_length);
-	printf("\tmmio_start: %lu\n", fsi.mmio_start);
-	printf("\tmmio_len: %d\n", fsi.mmio_len);
-	printf("\taccel: %d\n", fsi.accel);
-	printf("\tcapabilities: %d\n", fsi.capabilities);
+	memset(fb.addr, 0xff, fb.size);
+	fb_update(0, 0, fb.vsi.xres, fb.vsi.yres);
+}
+
+static void fb_loadimage(const char *path)
+{
+	int fd = open(path, O_RDONLY);
+	if (fd == -1) {
+		return;
+	}
+
+	char *img = mmap(NULL, fb.size, PROT_READ, MAP_PRIVATE, fd, 0);
+	if (img == MAP_FAILED) {
+		return;
+	}
+
+	memcpy(fb.addr, img, fb.size);
+	munmap(img, fb.size);
+	close(fd);
+
+	fb_update(0, 0, fb.vsi.xres, fb.vsi.yres);
 }
 
 void fb_init(void)
@@ -73,23 +81,44 @@ void fb_init(void)
 
 	printf("mapping framebuffer...\n");
 	
-	int fbfd = open("/dev/fb0", O_RDWR);
+	fb.fd = open("/dev/fb0", O_RDWR);
+
+	ioctl(fb.fd, FBIOGET_FSCREENINFO, &fb.fsi);
+
+	ioctl(fb.fd, FBIOGET_VSCREENINFO, &fb.vsi);
+
+	fb.vsi.bits_per_pixel = 8;
+	fb.vsi.grayscale = GRAYSCALE_8BIT_INVERTED;
+	fb.vsi.activate = FB_ACTIVATE_FORCE;
 
-	int io = ioctl(fbfd, FBIOGET_FSCREENINFO, &fsi);
-	dumpfsi("FBIOGET_FSCREENINFO", io);
+	ioctl(fb.fd, FBIOPUT_VSCREENINFO, &fb.vsi);
 
-	io = ioctl(fbfd, FBIOGET_VSCREENINFO, &vsi);
-	dumpvsi("FBIOEGET_VSCREENINFO", io);
+	fb.size = fb.vsi.xres_virtual * fb.vsi.yres_virtual;
+	fb.addr = mmap(NULL, fb.size, PROT_READ | PROT_WRITE, MAP_SHARED, fb.fd, 0);
 
-	vsi.bits_per_pixel = 8;
-	vsi.grayscale = 1;
-	vsi.activate = FB_ACTIVATE_FORCE;
+	printf("at %p\n", fb.addr);
 
-	io = ioctl(fbfd, FBIOPUT_VSCREENINFO, &vsi); 
-	dumpvsi("FBIOPUT_VSCREENINFO", io);
+	int updatemode = AUTO_UPDATE_MODE_REGION_MODE;
+	ioctl(fb.fd, MXCFB_SET_AUTO_UPDATE_MODE, &updatemode);
 
-	fbaddr = mmap(NULL, fsi.smem_len, PROT_READ | PROT_WRITE, MAP_PRIVATE, fbfd, 0);
+	/*
+	struct mxcfb_waveform_modes wave = {
+		.mode_init = WAVEFORM_MODE_INIT,
+		.mode_du = WAVEFORM_MODE_DU,
+		.mode_gc4 = WAVEFORM_MODE_GC4,
+		.mode_gc8 = WAVEFORM_MODE_GC16,
+		.mode_gc16 = WAVEFORM_MODE_GC16,
+		.mode_gc32 = WAVEFORM_MODE_GC16,
+	};
+	ioctl(fb.fd, MXCFB_SET_WAVEFORM_MODES, &wave);
+
+	int scheme = UPDATE_SCHEME_QUEUE_AND_MERGE;
+	ioctl(fb.fd, MXCFB_SET_UPDATE_SCHEME, &scheme);
+
+	int powerdelay = 0;
+	ioctl(fb.fd, MXCFB_SET_PWRDOWN_DELAY, &powerdelay);
+	*/
 
-	close(fbfd);
-	printf("at %p\n", fbaddr);
+	fb_blank();
+	//fb_loadimage("/run/media/mmcblk0p1/left-screen.dat");
 }
-- 
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