From b049f7b4360a73fcdc44a4dd801bfec4579381bb Mon Sep 17 00:00:00 2001
From: Matheus <matheusuky@gmail.com>
Date: Fri, 30 Sep 2022 19:37:41 -0300
Subject: [PATCH] framebuffer: ioctls

---
 src/video/framebuffer.c | 137 +++++++++++++++++++++++++++++++++++++++-
 1 file changed, 136 insertions(+), 1 deletion(-)

diff --git a/src/video/framebuffer.c b/src/video/framebuffer.c
index b953293b..71b5eb04 100644
--- a/src/video/framebuffer.c
+++ b/src/video/framebuffer.c
@@ -70,9 +70,144 @@ static int isseekable(int minor, size_t* max){
         return 0;
 }
 
+#define FBIOGET_VSCREENINFO	0x4600
+#define FBIOGET_FSCREENINFO	0x4602
+
+struct fb_bitfield {
+    uint32_t offset;
+    uint32_t length;
+    uint32_t msb_right;
+};
+
+typedef struct{
+    uint32_t xres;
+    uint32_t yres;
+    uint32_t xres_virtual;
+    uint32_t yres_virtual;
+    uint32_t xoffset;
+    uint32_t yoffset;
+    uint32_t bits_per_pixel;
+    uint32_t grayscale;
+    struct fb_bitfield red;
+    struct fb_bitfield green;
+    struct fb_bitfield blue;
+    struct fb_bitfield transp;
+    uint32_t nonstd;
+    uint32_t activate;
+    uint32_t height;
+    uint32_t width;
+    uint32_t accel_flags;
+    uint32_t pixclock;
+    uint32_t left_margin;
+    uint32_t right_margin;
+    uint32_t upper_margin;
+    uint32_t lower_margin;
+    uint32_t hsync_len;
+    uint32_t vsync_len;
+    uint32_t sync;
+    uint32_t vmode;
+    uint32_t rotate;
+    uint32_t colorspace;
+    uint32_t reserved[4];
+}fb_var_screeninfo;
+
+typedef struct {
+    char id[16];
+    unsigned long smem_start;
+    uint32_t smem_len;
+    uint32_t type;
+    uint32_t type_aux;
+    uint32_t visual;
+    uint16_t xpanstep;
+    uint16_t ypanstep;
+    uint16_t ywrapstep;
+    uint32_t line_length;
+    unsigned long mmio_start;
+    uint32_t mmio_len;
+    uint32_t accel;
+    uint16_t capabilities;
+    uint16_t reserved[2];
+} fb_fix_screeninfo;
+
+#define FB_VISUAL_TRUECOLOR 2
+#define FB_TYPE_PACKED_PIXELS 0
+
+
+static int ioctl(int minor, unsigned long req, void* arg){
+
+        if(minor >= fbcount)
+                return ENODEV;	
+
+	struct limine_framebuffer* fb = fbs[minor];
+        switch(req){
+               	case FBIOGET_FSCREENINFO:
+			{
+			fb_fix_screeninfo* i = arg;
+			strcpy(i->id, "LIMINE FB");
+			i->smem_start = fb->address;
+			i->smem_len = fb->pitch*fb->height;
+			i->type = FB_TYPE_PACKED_PIXELS;
+			i->visual = FB_VISUAL_TRUECOLOR;
+			i->xpanstep = 0;
+			i->ypanstep = 0;
+			i->line_length = fb->pitch;
+			i->mmio_start = 0;
+			i->mmio_len = 0;
+			i->accel = 0;
+			i->capabilities = 0;
+			}
+			break;
+		case FBIOGET_VSCREENINFO:
+			{
+			fb_var_screeninfo* i = arg;
+			i->xres = fb->width;
+			i->yres = fb->height;
+			i->xres_virtual = fb->width;
+			i->yres_virtual = fb->height;
+			i->xoffset = 0;
+			i->yoffset = 0;
+			i->bits_per_pixel = fb->bpp;
+			i->grayscale = 0;
+			i->red.msb_right = 1;
+			i->green.msb_right = 1;
+			i->blue.msb_right = 1;
+			i->transp.msb_right = 1;
+			i->red.offset = fb->red_mask_shift;
+			i->red.length = fb->red_mask_size;
+			i->blue.offset = fb->blue_mask_shift;
+			i->blue.length = fb->blue_mask_size;
+			i->green.offset = fb->green_mask_shift;
+			i->green.length = fb->green_mask_size;
+			i->transp.offset = 28;
+			i->transp.length = 8;
+			i->nonstd = 0;
+			i->activate = 0;
+			i->height = 0;
+			i->width = 0;
+			i->accel_flags = 0;
+			i->pixclock = 0;
+			i->left_margin = 0;
+			i->upper_margin = 0;
+			i->lower_margin = 0;
+			i->right_margin = 0;
+			i->hsync_len = 0;
+			i->vsync_len = 0;
+			i->vmode = 0;
+			i->rotate = 0;
+			i->colorspace = 0;
+			}
+			break;
+			default:
+                        	return ENOTTY;
+        }
+
+        return 0;
+
+}
+
 
 static devcalls calls = {
-	read, write, isatty, isseekable
+	read, write, isatty, isseekable, ioctl
 };
 
 void fb_init(){