| /* $Id: devops.c,v 1.3 1997/10/29 07:43:28 ecd Exp $ |
| * devops.c: Device operations using the PROM. |
| * |
| * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) |
| * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz) |
| */ |
| #include <linux/types.h> |
| #include <linux/kernel.h> |
| #include <linux/sched.h> |
| |
| #include <asm/openprom.h> |
| #include <asm/oplib.h> |
| |
| /* Open the device described by the string 'dstr'. Returns the handle |
| * to that device used for subsequent operations on that device. |
| * Returns 0 on failure. |
| */ |
| int |
| prom_devopen(const char *dstr) |
| { |
| return p1275_cmd ("open", P1275_ARG(0,P1275_ARG_IN_STRING)| |
| P1275_INOUT(1,1), |
| dstr); |
| } |
| |
| /* Close the device described by device handle 'dhandle'. */ |
| int |
| prom_devclose(int dhandle) |
| { |
| p1275_cmd ("close", P1275_INOUT(1,0), dhandle); |
| return 0; |
| } |
| |
| /* Seek to specified location described by 'seekhi' and 'seeklo' |
| * for device 'dhandle'. |
| */ |
| void |
| prom_seek(int dhandle, unsigned int seekhi, unsigned int seeklo) |
| { |
| p1275_cmd ("seek", P1275_INOUT(3,1), dhandle, seekhi, seeklo); |
| } |