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| author | Stefan Richter <stefanr@s5r6.in-berlin.de> | 2007-05-27 13:18:27 +0200 |
|---|---|---|
| committer | Stefan Richter <stefanr@s5r6.in-berlin.de> | 2007-05-31 21:40:13 +0200 |
| commit | 14e2198646d92ef52a69d20269580a3fbe7c996b (patch) | |
| tree | ff9522f74da61ade0ab3739a35ea90b85fd91fea | |
| parent | d7794c86686a05276de42f145e485099426aca68 (diff) | |
| download | linux-next-14e2198646d92ef52a69d20269580a3fbe7c996b.tar.gz | |
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>
| -rw-r--r-- | drivers/firewire/fw-device.h | 1 | ||||
| -rw-r--r-- | drivers/firewire/fw-sbp2.c | 53 |
2 files changed, 54 insertions, 0 deletions
diff --git a/drivers/firewire/fw-device.h b/drivers/firewire/fw-device.h index 0ba9d64ccf4c..af1723eae4ba 100644 --- a/drivers/firewire/fw-device.h +++ b/drivers/firewire/fw-device.h @@ -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 diff --git a/drivers/firewire/fw-sbp2.c b/drivers/firewire/fw-sbp2.c index 68300414e5f4..a98d3915e26f 100644 --- a/drivers/firewire/fw-sbp2.c +++ b/drivers/firewire/fw-sbp2.c @@ -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>"); |