blob: 4641839eb39a9184966f14d07c30ab5131f1e706 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* $Id: devops.c,v 1.3 1997/10/29 07:43:28 ecd 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
David S. Millerbff06d52005-09-22 20:11:33 -070019prom_devopen(const char *dstr)
Linus Torvalds1da177e2005-04-16 15:20:36 -070020{
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}