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path: root/drivers/usb/core/sysfs.c
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Diffstat (limited to 'drivers/usb/core/sysfs.c')
-rw-r--r--drivers/usb/core/sysfs.c59
1 files changed, 58 insertions, 1 deletions
diff --git a/drivers/usb/core/sysfs.c b/drivers/usb/core/sysfs.c
index cf05b97693ea..662c0cf3a3e1 100644
--- a/drivers/usb/core/sysfs.c
+++ b/drivers/usb/core/sysfs.c
@@ -412,6 +412,56 @@ set_level(struct device *dev, struct device_attribute *attr,
static DEVICE_ATTR(level, S_IRUGO | S_IWUSR, show_level, set_level);
+static ssize_t
+show_usb2_hardware_lpm(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct usb_device *udev = to_usb_device(dev);
+ const char *p;
+
+ if (udev->usb2_hw_lpm_enabled == 1)
+ p = "enabled";
+ else
+ p = "disabled";
+
+ return sprintf(buf, "%s\n", p);
+}
+
+static ssize_t
+set_usb2_hardware_lpm(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct usb_device *udev = to_usb_device(dev);
+ bool value;
+ int ret;
+
+ usb_lock_device(udev);
+
+ ret = strtobool(buf, &value);
+
+ if (!ret)
+ ret = usb_set_usb2_hardware_lpm(udev, value);
+
+ usb_unlock_device(udev);
+
+ if (!ret)
+ return count;
+
+ return ret;
+}
+
+static DEVICE_ATTR(usb2_hardware_lpm, S_IRUGO | S_IWUSR, show_usb2_hardware_lpm,
+ set_usb2_hardware_lpm);
+
+static struct attribute *usb2_hardware_lpm_attr[] = {
+ &dev_attr_usb2_hardware_lpm.attr,
+ NULL,
+};
+static struct attribute_group usb2_hardware_lpm_attr_group = {
+ .name = power_group_name,
+ .attrs = usb2_hardware_lpm_attr,
+};
+
static struct attribute *power_attrs[] = {
&dev_attr_autosuspend.attr,
&dev_attr_level.attr,
@@ -428,13 +478,20 @@ static int add_power_attributes(struct device *dev)
{
int rc = 0;
- if (is_usb_device(dev))
+ if (is_usb_device(dev)) {
+ struct usb_device *udev = to_usb_device(dev);
rc = sysfs_merge_group(&dev->kobj, &power_attr_group);
+ if (udev->usb2_hw_lpm_capable == 1)
+ rc = sysfs_merge_group(&dev->kobj,
+ &usb2_hardware_lpm_attr_group);
+ }
+
return rc;
}
static void remove_power_attributes(struct device *dev)
{
+ sysfs_unmerge_group(&dev->kobj, &usb2_hardware_lpm_attr_group);
sysfs_unmerge_group(&dev->kobj, &power_attr_group);
}