[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>
diff --git a/drivers/scsi/libsas/sas_scsi_host.c b/drivers/scsi/libsas/sas_scsi_host.c
index 1f82415..601ec5b 100644
--- a/drivers/scsi/libsas/sas_scsi_host.c
+++ b/drivers/scsi/libsas/sas_scsi_host.c
@@ -24,6 +24,8 @@
*/
#include <linux/kthread.h>
+#include <linux/firmware.h>
+#include <linux/ctype.h>
#include "sas_internal.h"
@@ -1064,6 +1066,45 @@
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);