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