smsc75xx: add support for USB dynamic autosuspend

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This patch adds support for USB dynamic autosuspend to the
smsc75xx driver.  This saves virtually no power in the USB
device but enables power savings in upstream hosts and
the host CPU.

Note currently Linux doesn't automatically enable this
functionality by default for devices so to test this:

 echo auto > /sys/bus/usb/devices/2-1.2/power/control

where 2-1.2 is the USB bus address of the LAN7500.

Signed-off-by: Steve Glendinning <steve.glendinning@shawell.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Steve Glendinning 2012-11-28 05:59:49 +00:00 • committed by David S. Miller

parent eacdd6c223

commit b4cdea9cc3

1 changed files with 119 additions and 4 deletions

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drivers/net/usb/smsc75xx.c

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