firewire: fw-sbp2: implement sysfs ieee1394_id
The attribute /sys/bus/scsi/devices/*:*:*:*/ieee1394_id, as generated by
the old sbp2 driver, is typically used to create persistently named
links in /dev/disk/by-id.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Kristian Høgsberg <krh@redhat.com>
diff --git a/drivers/firewire/fw-sbp2.c b/drivers/firewire/fw-sbp2.c
index 6830041..a98d391 100644
--- a/drivers/firewire/fw-sbp2.c
+++ b/drivers/firewire/fw-sbp2.c
@@ -1108,6 +1108,58 @@
return SUCCESS;
}
+/*
+ * Format of /sys/bus/scsi/devices/.../ieee1394_id:
+ * u64 EUI-64 : u24 directory_ID : u16 LUN (all printed in hexadecimal)
+ *
+ * This is the concatenation of target port identifier and logical unit
+ * identifier as per SAM-2...SAM-4 annex A.
+ */
+static ssize_t
+sbp2_sysfs_ieee1394_id_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct scsi_device *sdev = to_scsi_device(dev);
+ struct sbp2_device *sd;
+ struct fw_unit *unit;
+ struct fw_device *device;
+ u32 directory_id;
+ struct fw_csr_iterator ci;
+ int key, value, lun;
+
+ if (!sdev)
+ return 0;
+ sd = (struct sbp2_device *)sdev->host->hostdata;
+ unit = sd->unit;
+ device = fw_device(unit->device.parent);
+
+ /* implicit directory ID */
+ directory_id = ((unit->directory - device->config_rom) * 4
+ + CSR_CONFIG_ROM) & 0xffffff;
+
+ /* explicit directory ID, overrides implicit ID if present */
+ fw_csr_iterator_init(&ci, unit->directory);
+ while (fw_csr_iterator_next(&ci, &key, &value))
+ if (key == CSR_DIRECTORY_ID) {
+ directory_id = value;
+ break;
+ }
+
+ /* FIXME: Make this work for multi-lun devices. */
+ lun = 0;
+
+ return sprintf(buf, "%08x%08x:%06x:%04x\n",
+ device->config_rom[3], device->config_rom[4],
+ directory_id, lun);
+}
+
+static DEVICE_ATTR(ieee1394_id, S_IRUGO, sbp2_sysfs_ieee1394_id_show, NULL);
+
+static struct device_attribute *sbp2_scsi_sysfs_attrs[] = {
+ &dev_attr_ieee1394_id,
+ NULL
+};
+
static struct scsi_host_template scsi_driver_template = {
.module = THIS_MODULE,
.name = "SBP-2 IEEE-1394",
@@ -1121,6 +1173,7 @@
.use_clustering = ENABLE_CLUSTERING,
.cmd_per_lun = 1,
.can_queue = 1,
+ .sdev_attrs = sbp2_scsi_sysfs_attrs,
};
MODULE_AUTHOR("Kristian Hoegsberg <krh@bitplanet.net>");