| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 1 | /* $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 | */ |
| 18 | int |
| 19 | prom_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'. */ |
| 27 | int |
| 28 | prom_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 | */ |
| 37 | void |
| 38 | prom_seek(int dhandle, unsigned int seekhi, unsigned int seeklo) |
| 39 | { |
| 40 | p1275_cmd ("seek", P1275_INOUT(3,1), dhandle, seekhi, seeklo); |
| 41 | } |