1 files changed, 138 insertions, 0 deletions
diff --git a/drivers/sgi/char/graphics.c b/drivers/sgi/char/graphics.c
new file mode 100644
index 000000000..4d2e70993
--- /dev/null
+++ b/drivers/sgi/char/graphics.c
@@ -0,0 +1,138 @@
+/*
+ * gfx.c: support for SGI's /dev/graphics, /dev/opengl
+ * (C) 1997 Miguel de Icaza (miguel@nuclecu.unam.mx)
+ *
+ * On IRIX, /dev/graphics is [57, 0]
+ *          /dev/opengl   is [57, 1]
+ *
+ * From a mail with Mark Kilgard, /dev/opengl and /dev/graphics are
+ * the same thing, the use of /dev/graphics seems deprecated though.
+ */
+#include <linux/fs.h>
+#include <linux/miscdevice.h>
+#include <linux/sched.h>
+#include <asm/uaccess.h>
+#include "gconsole.h"
+#include "graphics.h"
+#include <asm/gfx.h>
+
+/* The boards */
+#include "newport.h"
+
+static int boards;
+static struct graphics_ops cards [MAXCARDS];
+
+int
+sgi_graphics_open (struct inode *inode, struct file *file)
+{
+	return 0;
+}
+
+int
+sgi_graphics_ioctl (struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
+{
+	int i;
+	
+	switch (cmd){
+	case GFX_GETNUM_BOARDS:
+		return boards;
+
+	case GFX_GETBOARD_INFO: {
+		struct gfx_getboardinfo_args *bia = (void *) arg;
+		int    board;
+		void   *dest_buf;
+		int    max_len;
+		
+		i = verify_area (VERIFY_READ, (void *) arg, sizeof (struct gfx_getboardinfo_args));
+		if (i) return i;
+		
+		__get_user_ret (board,    &bia->board, -EFAULT);
+		__get_user_ret (dest_buf, &bia->buf,   -EFAULT);
+		__get_user_ret (max_len,  &bia->len,   -EFAULT);
+
+		if (board >= boards)
+			return -EINVAL;
+		if (max_len < sizeof (struct gfx_getboardinfo_args))
+			return -EINVAL;
+		if (max_len > cards [board].board_info_len)
+			max_len = cards [boards].board_info_len;
+		i = verify_area (VERIFY_WRITE, dest_buf, max_len);
+		if (i) return i;
+		if (copy_to_user (dest_buf, cards [board].board_info, max_len))
+			return -EFAULT;
+		return max_len;
+	}
+	} /* ioctl switch (cmd) */
+	
+	return -EINVAL;
+}
+
+int
+sgi_graphics_close (struct inode *inode, struct file *file)
+{
+	return 0;
+}
+
+/* Do any post card-detection setup on graphics_ops */
+static void
+graphics_ops_post_init (int slot)
+{
+	/* There is no owner for the card initially */
+	cards [slot].owner = (struct task_struct *) 0;
+}
+
+struct file_operations sgi_graphics_fops = {
+	NULL,			/* llseek */
+	NULL,			/* read */
+	NULL,			/* write */
+	NULL,			/* readdir */
+	NULL,			/* poll */
+	sgi_graphics_ioctl,	/* ioctl */
+	NULL,			/* mmap */
+	sgi_graphics_open,	/* open */
+	sgi_graphics_close,	/* release */
+	NULL,			/* fsync */
+	NULL,			/* check_media_change */
+	NULL,			/* revalidate */
+	NULL			/* lock */
+};
+
+/* /dev/graphics */
+static struct miscdevice dev_graphics = {
+        SGI_GRAPHICS_MINOR, "sgi-graphics", &sgi_graphics_fops
+};
+
+/* /dev/opengl */
+static struct miscdevice dev_opengl = {
+        SGI_OPENGL_MINOR, "sgi-opengl", &sgi_graphics_fops
+};
+
+void 
+gfx_init (char **name)
+{
+	struct console_ops *console;
+	struct graphics_ops *g;
+
+	console = &gconsole;
+	
+	if ((g = newport_probe (boards, console, name)) != 0){
+		cards [boards] = *g;
+		graphics_ops_post_init (boards);
+		boards++;
+		console = 0;
+	}
+	/* Add more graphic drivers here */
+	/* Keep passing console around */
+	
+	if (boards > MAXCARDS){
+		printk ("Too many cards found on the system\n");
+		prom_halt ();
+	}
+}
+
+void
+gfx_register (void)
+{
+	misc_register (&dev_graphics);
+	misc_register (&dev_opengl);
+}