usbcore: add sysfs support to xHCI usb3 hardware LPM
Add a sysfs node to make it easier to verify if LPM is supported and being
enabled for USB 3.0 devices.
Signed-off-by: Kevin Strasser <kevin.strasser@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/usb/core/sysfs.c b/drivers/usb/core/sysfs.c
index d269738..cfc68c1 100644
--- a/drivers/usb/core/sysfs.c
+++ b/drivers/usb/core/sysfs.c
@@ -531,6 +531,25 @@
}
static DEVICE_ATTR_RW(usb2_lpm_besl);
+static ssize_t usb3_hardware_lpm_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct usb_device *udev = to_usb_device(dev);
+ const char *p;
+
+ usb_lock_device(udev);
+
+ if (udev->usb3_lpm_enabled)
+ p = "enabled";
+ else
+ p = "disabled";
+
+ usb_unlock_device(udev);
+
+ return sprintf(buf, "%s\n", p);
+}
+static DEVICE_ATTR_RO(usb3_hardware_lpm);
+
static struct attribute *usb2_hardware_lpm_attr[] = {
&dev_attr_usb2_hardware_lpm.attr,
&dev_attr_usb2_lpm_l1_timeout.attr,
@@ -542,6 +561,15 @@
.attrs = usb2_hardware_lpm_attr,
};
+static struct attribute *usb3_hardware_lpm_attr[] = {
+ &dev_attr_usb3_hardware_lpm.attr,
+ NULL,
+};
+static struct attribute_group usb3_hardware_lpm_attr_group = {
+ .name = power_group_name,
+ .attrs = usb3_hardware_lpm_attr,
+};
+
static struct attribute *power_attrs[] = {
&dev_attr_autosuspend.attr,
&dev_attr_level.attr,
@@ -564,6 +592,9 @@
if (udev->usb2_hw_lpm_capable == 1)
rc = sysfs_merge_group(&dev->kobj,
&usb2_hardware_lpm_attr_group);
+ if (udev->lpm_capable == 1)
+ rc = sysfs_merge_group(&dev->kobj,
+ &usb3_hardware_lpm_attr_group);
}
return rc;