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firewire: fw-sbp2: implement sysfs ieee1394_id

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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>
This commit is contained in:
Stefan Richter 2007-05-27 13:18:27 +02:00
parent d7794c8668
commit 14e2198646
2 changed files with 54 additions and 0 deletions
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1
drivers/firewire/fw-device.h
View file

@ -99,6 +99,7 @@ fw_unit(struct device *dev)
#define CSR_DEPENDENT_INFO 0x14
#define CSR_MODEL 0x17
#define CSR_INSTANCE 0x18
#define CSR_DIRECTORY_ID 0x20
#define SBP2_COMMAND_SET_SPECIFIER 0x38
#define SBP2_COMMAND_SET 0x39

53
drivers/firewire/fw-sbp2.c
View file

@ -1108,6 +1108,58 @@ static int sbp2_scsi_abort(struct scsi_cmnd *cmd)
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 @@ static struct scsi_host_template scsi_driver_template = {
.use_clustering = ENABLE_CLUSTERING,
.cmd_per_lun = 1,
.can_queue = 1,
.sdev_attrs = sbp2_scsi_sysfs_attrs,
};
MODULE_AUTHOR("Kristian Hoegsberg <krh@bitplanet.net>");