From d06eca1772190435e5dcb370db734653d3989bc8 Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Wed, 24 Apr 2024 19:52:56 -0400
Subject: kernel: fbdev: Add framebuffer ioctl

Signed-off-by: Ian Moffett <ian@osmora.org>
---
 sys/dev/video/fbdev.c         | 24 ++++++++++++++++++++++++
 sys/include/dev/video/fbdev.h |  9 +++++++++
 2 files changed, 33 insertions(+)

(limited to 'sys')

diff --git a/sys/dev/video/fbdev.c b/sys/dev/video/fbdev.c
index 1f20ab6..af020a1 100644
--- a/sys/dev/video/fbdev.c
+++ b/sys/dev/video/fbdev.c
@@ -31,6 +31,8 @@
 #include <sys/limine.h>
 #include <sys/device.h>
 #include <sys/driver.h>
+#include <sys/system.h>
+#include <sys/errno.h>
 #include <dev/video/fbdev.h>
 #include <vm/vm.h>
 #include <fs/devfs.h>
@@ -45,6 +47,27 @@ static volatile struct limine_framebuffer_request framebuffer_req = {
 
 static struct device *dev;
 
+static int
+fbdev_ioctl(struct device *dev, uint32_t cmd, uintptr_t arg)
+{
+    struct fbdev_info info = {
+        .width = FRAMEBUFFER->width,
+        .height = FRAMEBUFFER->height,
+        .pitch = FRAMEBUFFER->pitch,
+        .bits_per_pixel = FRAMEBUFFER->bpp
+    };
+
+    switch (cmd) {
+    case FBIOCTL_INFO:
+        copyout(&info, arg, sizeof(info));
+        break;
+    default:
+        return -EINVAL;
+    }
+
+    return 0;
+}
+
 static paddr_t
 fbdev_mmap(struct device *dev, off_t off, vm_prot_t prot)
 {
@@ -80,6 +103,7 @@ fbdev_init(void)
     dev->read = NULL;
     dev->write = NULL;
     dev->mmap = fbdev_mmap;
+    dev->ioctl = fbdev_ioctl;
 
     device_create(dev, device_alloc_major(), 1);
     devfs_add_dev("fb", dev);
diff --git a/sys/include/dev/video/fbdev.h b/sys/include/dev/video/fbdev.h
index 123182f..e9c9282 100644
--- a/sys/include/dev/video/fbdev.h
+++ b/sys/include/dev/video/fbdev.h
@@ -32,6 +32,15 @@
 
 #include <sys/types.h>
 
+#define FBIOCTL_INFO 0x00000000
+
+struct fbdev_info {
+    uint32_t width;
+    uint32_t height;
+    uint32_t pitch;
+    uint32_t bits_per_pixel;
+};
+
 struct fbdev {
     void *mem;
     uint32_t width;
-- 
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