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/*
* 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);
}
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