@@ -244,8 +244,12 @@ static int eem_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
* - suspend: peripheral ready to suspend
* - response: suggest N millisec polling
* - response complete: suggest N sec polling
+ *
+ * Suspend is reported and maybe heeded.
*/
case 2: /* Suspend hint */
+ usbnet_device_suggests_idle(dev);
+ continue;
case 3: /* Response hint */
case 4: /* Response complete hint */
continue;
@@ -1580,10 +1580,27 @@ int usbnet_resume (struct usb_interface *intf)
tasklet_schedule (&dev->bh);
}
}
+
+ if (test_and_clear_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags))
+ usb_autopm_get_interface_no_resume(intf);
+
return 0;
}
EXPORT_SYMBOL_GPL(usbnet_resume);
+/*
+ * Either a subdriver implements manage_power, then it is assumed to always
+ * be ready to be suspended or it reports the readiness to be suspended
+ * explicitly
+ */
+void usbnet_device_suggests_idle(struct usbnet *dev)
+{
+ if (!test_and_set_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) {
+ dev->intf->needs_remote_wakeup = 1;
+ usb_autopm_put_interface_async(dev->intf);
+ }
+}
+EXPORT_SYMBOL(usbnet_device_suggests_idle);
/*-------------------------------------------------------------------------*/
@@ -68,6 +68,7 @@ struct usbnet {
# define EVENT_RX_PAUSED 5
# define EVENT_DEV_ASLEEP 6
# define EVENT_DEV_OPEN 7
+# define EVENT_DEVICE_REPORT_IDLE 8
};
static inline struct usb_driver *driver_of(struct usb_interface *intf)
@@ -160,6 +161,7 @@ extern int usbnet_probe(struct usb_interface *, const struct usb_device_id *);
extern int usbnet_suspend(struct usb_interface *, pm_message_t);
extern int usbnet_resume(struct usb_interface *);
extern void usbnet_disconnect(struct usb_interface *);
+extern void usbnet_device_suggests_idle(struct usbnet *dev);
/* Drivers that reuse some of the standard USB CDC infrastructure
Some device types support a form of power management in which the device suggests to the host that the device may be suspended now. Support for that is best located in usbnet. Signed-off-by: Oliver Neukum <oneukum@suse.de> --- drivers/net/usb/cdc_eem.c | 4 ++++ drivers/net/usb/usbnet.c | 17 +++++++++++++++++ include/linux/usb/usbnet.h | 2 ++ 3 files changed, 23 insertions(+), 0 deletions(-)