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[SCSI] libsas: Provide a transport-level facility to request SAS addrs 

Provide a facility to use the request_firmware() interface to get a SAS
address from userspace.  This can be used by SAS LLDDs that cannot
obtain the address from the host adapter.

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
Darrick J. Wong 2008-02-19 10:49:40 -08:00 committed by James Bottomley
parent 7e23ea4884
commit 45e6cdf414
2 changed files with 43 additions and 0 deletions
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41
drivers/scsi/libsas/sas_scsi_host.c
View File

@ -24,6 +24,8 @@
*/
#include <linux/kthread.h>
#include <linux/firmware.h>
#include <linux/ctype.h>
#include "sas_internal.h"
@ -1064,6 +1066,45 @@ void sas_target_destroy(struct scsi_target *starget)
return;
}
static void sas_parse_addr(u8 *sas_addr, const char *p)
{
int i;
for (i = 0; i < SAS_ADDR_SIZE; i++) {
u8 h, l;
if (!*p)
break;
h = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10;
p++;
l = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10;
p++;
sas_addr[i] = (h<<4) | l;
}
}
#define SAS_STRING_ADDR_SIZE 16
int sas_request_addr(struct Scsi_Host *shost, u8 *addr)
{
int res;
const struct firmware *fw;
res = request_firmware(&fw, "sas_addr", &shost->shost_gendev);
if (res)
return res;
if (fw->size < SAS_STRING_ADDR_SIZE) {
res = -ENODEV;
goto out;
}
sas_parse_addr(addr, fw->data);
out:
release_firmware(fw);
return res;
}
EXPORT_SYMBOL_GPL(sas_request_addr);
EXPORT_SYMBOL_GPL(sas_queuecommand);
EXPORT_SYMBOL_GPL(sas_target_alloc);
EXPORT_SYMBOL_GPL(sas_slave_configure);

2
include/scsi/libsas.h
View File

@ -677,4 +677,6 @@ extern void sas_ssp_task_response(struct device *dev, struct sas_task *task,
struct ssp_response_iu *iu);
struct sas_phy *sas_find_local_phy(struct domain_device *dev);
int sas_request_addr(struct Scsi_Host *shost, u8 *addr);
#endif /* _SASLIB_H_ */