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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: Oliver Neukum <oneukum@suse.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Oliver Neukum 2012-10-11 02:50:10 +00:00 committed by David S. Miller
parent e7d491a19d
commit 5d9d01a302
3 changed files with 23 additions and 0 deletions
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4
drivers/net/usb/cdc_eem.c
View File

@ -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;

17
drivers/net/usb/usbnet.c
View File

@ -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);
/*-------------------------------------------------------------------------*/

2
include/linux/usb/usbnet.h
View File

@ -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