mirror of https://gitee.com/openkylin/linux.git
90 lines
1.9 KiB
C
90 lines
1.9 KiB
C
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/* $Id: devops.c,v 1.13 2000/08/26 02:38:03 anton Exp $
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* devops.c: Device operations using the PROM.
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*
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* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <asm/openprom.h>
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#include <asm/oplib.h>
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extern void restore_current(void);
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/* Open the device described by the string 'dstr'. Returns the handle
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* to that device used for subsequent operations on that device.
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* Returns -1 on failure.
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*/
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int
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prom_devopen(char *dstr)
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{
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int handle;
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unsigned long flags;
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spin_lock_irqsave(&prom_lock, flags);
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switch(prom_vers) {
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case PROM_V0:
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handle = (*(romvec->pv_v0devops.v0_devopen))(dstr);
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if(handle == 0) handle = -1;
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break;
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case PROM_V2:
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case PROM_V3:
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handle = (*(romvec->pv_v2devops.v2_dev_open))(dstr);
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break;
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default:
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handle = -1;
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break;
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};
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restore_current();
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spin_unlock_irqrestore(&prom_lock, flags);
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return handle;
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}
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/* Close the device described by device handle 'dhandle'. */
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int
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prom_devclose(int dhandle)
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{
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unsigned long flags;
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spin_lock_irqsave(&prom_lock, flags);
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switch(prom_vers) {
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case PROM_V0:
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(*(romvec->pv_v0devops.v0_devclose))(dhandle);
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break;
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case PROM_V2:
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case PROM_V3:
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(*(romvec->pv_v2devops.v2_dev_close))(dhandle);
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break;
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default:
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break;
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};
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restore_current();
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spin_unlock_irqrestore(&prom_lock, flags);
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return 0;
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}
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/* Seek to specified location described by 'seekhi' and 'seeklo'
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* for device 'dhandle'.
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*/
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void
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prom_seek(int dhandle, unsigned int seekhi, unsigned int seeklo)
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{
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unsigned long flags;
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spin_lock_irqsave(&prom_lock, flags);
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switch(prom_vers) {
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case PROM_V0:
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(*(romvec->pv_v0devops.v0_seekdev))(dhandle, seekhi, seeklo);
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break;
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case PROM_V2:
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case PROM_V3:
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(*(romvec->pv_v2devops.v2_dev_seek))(dhandle, seekhi, seeklo);
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break;
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default:
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break;
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};
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restore_current();
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spin_unlock_irqrestore(&prom_lock, flags);
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return;
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}
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