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, 38 insertions, 0 deletions

diff --git a/drivers/misc/enclosure.c b/drivers/misc/enclosure.c
index b62314d627ae..38552a31304a 100644
--- a/drivers/misc/enclosure.c
+++ b/drivers/misc/enclosure.c
@@ -148,6 +148,7 @@ enclosure_register(struct device *dev, const char *name, int components,
         for (i = 0; i < components; i++) {
                 edev->component[i].number = -1;
                 edev->component[i].slot = -1;
+                edev->component[i].power_status = 1;
         }
 
         mutex_lock(&container_list_lock);
@@ -583,6 +584,40 @@ static ssize_t set_component_locate(struct device *cdev,
         return count;
 }
 
+static ssize_t get_component_power_status(struct device *cdev,
+                                          struct device_attribute *attr,
+                                          char *buf)
+{
+        struct enclosure_device *edev = to_enclosure_device(cdev->parent);
+        struct enclosure_component *ecomp = to_enclosure_component(cdev);
+
+        if (edev->cb->get_power_status)
+                edev->cb->get_power_status(edev, ecomp);
+        return snprintf(buf, 40, "%s\n", ecomp->power_status ? "on" : "off");
+}
+
+static ssize_t set_component_power_status(struct device *cdev,
+                                          struct device_attribute *attr,
+                                          const char *buf, size_t count)
+{
+        struct enclosure_device *edev = to_enclosure_device(cdev->parent);
+        struct enclosure_component *ecomp = to_enclosure_component(cdev);
+        int val;
+
+        if (strncmp(buf, "on", 2) == 0 &&
+            (buf[2] == '\n' || buf[2] == '\0'))
+                val = 1;
+        else if (strncmp(buf, "off", 3) == 0 &&
+            (buf[3] == '\n' || buf[3] == '\0'))
+                val = 0;
+        else
+                return -EINVAL;
+
+        if (edev->cb->set_power_status)
+                edev->cb->set_power_status(edev, ecomp, val);
+        return count;
+}
+
 static ssize_t get_component_type(struct device *cdev,
                                   struct device_attribute *attr, char *buf)
 {
@@ -614,6 +649,8 @@ static DEVICE_ATTR(active, S_IRUGO | S_IWUSR, get_component_active,
                    set_component_active);
 static DEVICE_ATTR(locate, S_IRUGO | S_IWUSR, get_component_locate,
                    set_component_locate);
+static DEVICE_ATTR(power_status, S_IRUGO | S_IWUSR, get_component_power_status,
+                   set_component_power_status);
 static DEVICE_ATTR(type, S_IRUGO, get_component_type, NULL);
 static DEVICE_ATTR(slot, S_IRUGO, get_component_slot, NULL);
 
@@ -622,6 +659,7 @@ static struct attribute *enclosure_component_attrs[] = {
         &dev_attr_status.attr,
         &dev_attr_active.attr,
         &dev_attr_locate.attr,
+        &dev_attr_power_status.attr,
         &dev_attr_type.attr,
         &dev_attr_slot.attr,
         NULL