From: Alexandra Yates <alexandra.yates@xxxxxxxxxxxxxxx>
This patch reports the low power state L1 for ports with attahced USB2
devices. The output will be part of the roothub port status as follows:
ayates@magd:~$ sudo lsusb -v -s 001:001
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
...
Hub Descriptor:
bLength 11
bDescriptorType 41
nNbrPorts 9
wHubCharacteristic 0x000a
No power switching (usb 1.0)
Per-port overcurrent protection
TT think time 8 FS bits
bPwrOn2PwrGood 10 * 2 milli seconds
bHubContrCurrent 0 milli Ampere
DeviceRemovable 0x68 0x02
PortPwrCtrlMask 0xff 0xff
Hub Port Status:
Port 1: 0000.0103 power enable
Port 2: 0000.0523 highspeed power L1 enable
Port 3: 0000.0100 power
Port 4: 0000.0100 power
Port 5: 0000.0503 highspeed power enable
Port 6: 0000.0100 power
Port 7: 0000.0100 power
Port 8: 0000.0100 power
Port 9: 0000.0100 power
Device Status: 0x0001
In this example port id: 0000.0523 is in L1 status.
This output is collected from testing the change on a HSWULT platform.
Signed-off-by: Alexandra Yates <alexandra.yates@xxxxxxxxxxxxxxx>
---
lsusb.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/lsusb.c b/lsusb.c
index 470146c..4306697 100644
--- a/lsusb.c
+++ b/lsusb.c
@@ -3317,6 +3317,7 @@ static void do_hub(libusb_device_handle *fd, unsigned tt_type, unsigned speed)
(status[1] & 0x04) ? " highspeed" : "",
(status[1] & 0x02) ? " lowspeed" : "",
(status[1] & 0x01) ? " power" : "",
+ (status[0] & 0x20) ? " L1" : "",
(status[0] & 0x10) ? " RESET" : "",
(status[0] & 0x08) ? " oc" : "",
(status[0] & 0x04) ? " suspend" : "",
--
1.7.9.5
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