On 2012/7/7 2:14, Greg KH wrote:
On Fri, Jul 06, 2012 at 02:14:00PM +0800, Lan Tianyu wrote:
Change since v5: Add usb_autopm_get/put_interface() around the port
power operations in the control attribute's callback to deal with
situation that control attribute is changed when the usb hub is suspended.
Change since v4: Add clear PORT_POWER if power policy is "off" in the
hub_power_on(). Return -EIO if set/clear PORT_POWER fails in the store_port_power_control()
This patch is to add two attributes for each usb hub ports to control port's power.
Control port's power through setting or clearing PORT_POWER feature.
control has two options. "auto", "on" and "off"
"on" - port power must be on.
"off" - port power must be off.
state reports usb port's power state
"on" - power on
"off" - power off
"error" - can't get power state
Acked-by: Alan Stern<stern@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Lan Tianyu<tianyu.lan@xxxxxxxxx>
---
Documentation/ABI/testing/sysfs-bus-usb | 25 ++++++
drivers/usb/core/hub.c | 133 ++++++++++++++++++++++++++++++-
2 files changed, 157 insertions(+), 1 deletions(-)
diff --git a/Documentation/ABI/testing/sysfs-bus-usb b/Documentation/ABI/testing/sysfs-bus-usb
index 6df4e6f..abe4ea4 100644
--- a/Documentation/ABI/testing/sysfs-bus-usb
+++ b/Documentation/ABI/testing/sysfs-bus-usb
@@ -208,3 +208,28 @@ Description:
such as ACPI. This file will read either "removable" or
"fixed" if the information is available, and "unknown"
otherwise.
+
+What: /sys/bus/usb/devices/.../(hub interface)/portX/control
+Date: June 2012
It is no longer June 2012 :)
Oh. Sorry. Forgot to modify. Time is too quick. :)
Will update soon.
--
Best Regards
Tianyu Lan
linux kernel enabling team
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