1/* $Id: devops.c,v 1.1.1.1 2008/10/15 03:26:19 james26_jang Exp $
2 * devops.c:  Device operations using the PROM.
3 *
4 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
5 * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
6 */
7#include <linux/types.h>
8#include <linux/kernel.h>
9#include <linux/sched.h>
10
11#include <asm/openprom.h>
12#include <asm/oplib.h>
13
14/* Open the device described by the string 'dstr'.  Returns the handle
15 * to that device used for subsequent operations on that device.
16 * Returns 0 on failure.
17 */
18int
19prom_devopen(char *dstr)
20{
21	return p1275_cmd ("open", P1275_ARG(0,P1275_ARG_IN_STRING)|
22				  P1275_INOUT(1,1),
23				  dstr);
24}
25
26/* Close the device described by device handle 'dhandle'. */
27int
28prom_devclose(int dhandle)
29{
30	p1275_cmd ("close", P1275_INOUT(1,0), dhandle);
31	return 0;
32}
33
34/* Seek to specified location described by 'seekhi' and 'seeklo'
35 * for device 'dhandle'.
36 */
37void
38prom_seek(int dhandle, unsigned int seekhi, unsigned int seeklo)
39{
40	p1275_cmd ("seek", P1275_INOUT(3,1), dhandle, seekhi, seeklo);
41}
42