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Commit 5d9d01a3 authored by Oliver Neukum's avatar Oliver Neukum Committed by David S. Miller
Browse files

usbnet: Support devices reporting idleness 



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: default avatarOliver Neukum <oneukum@suse.de>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent e7d491a1

drivers/net/usb/cdc_eem.c

+4 −0
Original line number Diff line number Diff line
@@ -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;

drivers/net/usb/usbnet.c

+17 −0
Original line number Diff line number Diff line
@@ -1588,10 +1588,27 @@ 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);



/*-------------------------------------------------------------------------*/

include/linux/usb/usbnet.h

+2 −0
Original line number Diff line number Diff line
@@ -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