usbnet & cdc-ether: Autosuspend for online devices

Using remote wakeup and delayed transmission to allow
online device to go into usb autosuspend.
Minimal alternate support for devices that don't support
remote wakeup.

Signed-off-by: Oliver Neukum <oliver@neukum.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/net/usb/cdc_ether.c b/drivers/net/usb/cdc_ether.c
index 197912d9c04a..21e183a83b99 100644
--- a/drivers/net/usb/cdc_ether.c
+++ b/drivers/net/usb/cdc_ether.c
@@ -411,6 +411,12 @@ static int cdc_bind(struct usbnet *dev, struct usb_interface *intf)
         return 0;
 }
 
+static int cdc_manage_power(struct usbnet *dev, int on)
+{
+        dev->intf->needs_remote_wakeup = on;
+        return 0;
+}
+
 static const struct driver_info cdc_info = {
         .description =  "CDC Ethernet Device",
         .flags =        FLAG_ETHER | FLAG_LINK_INTR,
@@ -418,6 +424,7 @@ static const struct driver_info	cdc_info = {
         .bind =         cdc_bind,
         .unbind =       usbnet_cdc_unbind,
         .status =       cdc_status,
+        .manage_power = cdc_manage_power,
 };
 
 static const struct driver_info mbm_info = {
@@ -619,6 +626,7 @@ static struct usb_driver cdc_driver = {
         .suspend =      usbnet_suspend,
         .resume =       usbnet_resume,
         .reset_resume = usbnet_resume,
+        .supports_autosuspend = 1,
 };