ses: Add power_status to SES device slot

Add power_status to SES device slot, so we can power on/off the
HDDs behind the enclosure.

Check firmware status in ses_set_* before sending control pages to
firmware.

Signed-off-by: Song Liu <songliubraving@fb.com>
Acked-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Jens Axboe <axboe@fb.com>
Cc: Hannes Reinecke <hare@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>

1 files changed, 6 insertions, 0 deletions

diff --git a/include/linux/enclosure.h b/include/linux/enclosure.h
index 0f826c14a337..7be22da321f3 100644
--- a/include/linux/enclosure.h
+++ b/include/linux/enclosure.h
@@ -79,6 +79,11 @@ struct enclosure_component_callbacks {
         int (*set_locate)(struct enclosure_device *,
                           struct enclosure_component *,
                           enum enclosure_component_setting);
+        void (*get_power_status)(struct enclosure_device *,
+                                 struct enclosure_component *);
+        int (*set_power_status)(struct enclosure_device *,
+                                struct enclosure_component *,
+                                int);
         int (*show_id)(struct enclosure_device *, char *buf);
 };
 
@@ -94,6 +99,7 @@ struct enclosure_component {
         int locate;
         int slot;
         enum enclosure_status status;
+        int power_status;
 };
 
 struct enclosure_device {