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ses: add reliable slot attribute

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The name provided by firmware is in a vendor specific format, publish
the slot number to have a reliable mechanism for identifying slots
across firmware implementations.  If the enclosure does not provide a
slot number fallback to the component number which is guaranteed unique,
and usually mirrors the slot number.

Cleaned up the unused ses_component.desc in the process.

Signed-off-by: Dan Williams <[email protected]>
Signed-off-by: Song Liu <[email protected]>
Reviewed-by: Jens Axboe <[email protected]>
Reviewed-by: Hannes Reinecke <[email protected]>
Signed-off-by: Christoph Hellwig <[email protected]>
This commit is contained in:
Dan Williams 2014-12-30 14:46:17 -08:00 • committed by Christoph Hellwig
commit 921ce7f578
3 changed files with 32 additions and 6 deletions
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20
drivers/misc/enclosure.c
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@ -145,8 +145,10 @@ enclosure_register(struct device *dev, const char *name, int components,
if (err)
goto err;
for (i = 0; i < components; i++)
for (i = 0; i < components; i++) {
edev->component[i].number = -1;
edev->component[i].slot = -1;
}
mutex_lock(&container_list_lock);
list_add_tail(&edev->node, &container_list);
@ -589,6 +591,20 @@ static ssize_t get_component_type(struct device *cdev,
return snprintf(buf, 40, "%s\n", enclosure_type[ecomp->type]);
}
static ssize_t get_component_slot(struct device *cdev,
struct device_attribute *attr, char *buf)
{
struct enclosure_component *ecomp = to_enclosure_component(cdev);
int slot;
/* if the enclosure does not override then use 'number' as a stand-in */
if (ecomp->slot >= 0)
slot = ecomp->slot;
else
slot = ecomp->number;
return snprintf(buf, 40, "%d\n", slot);
}
static DEVICE_ATTR(fault, S_IRUGO | S_IWUSR, get_component_fault,
set_component_fault);
@ -599,6 +615,7 @@ static DEVICE_ATTR(active, S_IRUGO | S_IWUSR, get_component_active,
static DEVICE_ATTR(locate, S_IRUGO | S_IWUSR, get_component_locate,
set_component_locate);
static DEVICE_ATTR(type, S_IRUGO, get_component_type, NULL);
static DEVICE_ATTR(slot, S_IRUGO, get_component_slot, NULL);
static struct attribute *enclosure_component_attrs[] = {
&dev_attr_fault.attr,
@ -606,6 +623,7 @@ static struct attribute *enclosure_component_attrs[] = {
&dev_attr_active.attr,
&dev_attr_locate.attr,
&dev_attr_type.attr,
&dev_attr_slot.attr,
NULL
};
ATTRIBUTE_GROUPS(enclosure_component);