Add a new flag may_power_off for scsi device, it gives the user a chance
to control when the device is runtime suspended, can we remove its power
if possible.
And if the device can be powered off(reflected by can_power_off flag,
determined by individual driver), create a sysfs entry named
may_power_off to let user control the flag.
I'm planning using this flag for sr and sd.
Signed-off-by: Aaron Lu <aaron.lu@xxxxxxxxx>
---
drivers/scsi/scsi_sysfs.c | 10 ++++++----
include/scsi/scsi_device.h | 1 +
2 files changed, 7 insertions(+), 4 deletions(-)
diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
index 093d4f6..92ea17c 100644
--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -484,9 +484,6 @@ sdev_store_##field (struct device *dev, struct device_attribute *attr, \
} \
static DEVICE_ATTR(field, S_IRUGO | S_IWUSR, sdev_show_##field, sdev_store_##field);
-/* Currently we don't export bit fields, but we might in future,
- * so leave this code in */
-#if 0
/*
* sdev_rd_attr: create a function and attribute variable for a
* read/write bit field.
@@ -526,7 +523,7 @@ static int scsi_sdev_check_buf_bit(const char *buf)
} else
return -EINVAL;
}
-#endif
+
/*
* Create the actual show/store functions and data structures.
*/
@@ -860,6 +857,8 @@ static struct device_attribute sdev_attr_queue_type_rw =
__ATTR(queue_type, S_IRUGO | S_IWUSR, show_queue_type_field,
sdev_store_queue_type_rw);
+sdev_rw_attr_bit (may_power_off);
+
/**
* scsi_sysfs_add_sdev - add scsi device to sysfs
* @sdev: scsi_device to add
@@ -950,6 +949,9 @@ int scsi_sysfs_add_sdev(struct scsi_device *sdev)
}
}
+ if (sdev->can_power_off)
+ device_create_file(&sdev->sdev_gendev, &dev_attr_may_power_off);
+
return error;
}
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index 72d946f..41cec7f 100644
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -157,6 +157,7 @@ struct scsi_device {
unsigned can_power_off:1; /* Device supports runtime power off */
unsigned wce_default_on:1; /* Cache is ON by default */
unsigned wakeup_by_user:1; /* User wakes up the device */
+ unsigned may_power_off:1; /* Power off is allowed by user */
DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */
struct list_head event_list; /* asserted events */
--
1.7.11.5
--
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