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Subject: Re: [Qemu-devel] [PATCH 1/3] usb-hub: wakeup on attach
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To: hkran <hkran@linux.vnet.ibm.com>
Cc: hkran <hkran@vnet.linux.ibm.com>, qemu-devel@nongnu.org

On 11/03/11 07:01, hkran wrote:
> On 11/02/2011 08:56 PM, Gerd Hoffmann wrote:
>>    Hi,
>>
>>>>    static void usb_hub_detach(USBPort *port1)
>>> pulled, In what cases, the usb hub will be suspended? and how to tell it
>>> happened? thanks.
>> The guest enables the remote-wakeup feature.  'lspci -v' (within the
>> guest) shows it.
>>
>> cheers,
>>    Gerd
>>
> I use the param "-usb -usbdevice tablet" to start qemu  and then usb_del
> tablet via monitor console after getting qemu up.
> I saw this by entering lsusb -v
> 
> Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
> Device Descriptor:
>   bLength                18
>   bDescriptorType         1
>   bcdUSB               1.10
>   bDeviceClass            9 Hub
>   bDeviceSubClass         0 Unused
>   bDeviceProtocol         0 Full speed (or root) hub
>   bMaxPacketSize0        64
>   idVendor           0x1d6b Linux Foundation
>   idProduct          0x0001 1.1 root hub
>   bcdDevice            2.06
>   iManufacturer           3 Linux 2.6.32-131.0.15.el6.x86_64 uhci_hcd
>   iProduct                2 UHCI Host Controller
>   iSerial                 1 0000:00:01.2
> ..........................
> Hub Descriptor:
>   bLength               9
>   bDescriptorType      41
>   nNbrPorts             2
>   wHubCharacteristic 0x000a
>     No power switching (usb 1.0)
>     Per-port overcurrent protection
>   bPwrOn2PwrGood        1 * 2 milli seconds
>   bHubContrCurrent      0 milli Ampere
>   DeviceRemovable    0x00
>   PortPwrCtrlMask    0xff
>  Hub Port Status:
>    Port 1: 0000.0100 power
>    Port 2: 0000.0100 power
> Device Status:     0x0003
>   Self Powered
>   Remote Wakeup Enabled
> 
> (It seems that the Remote-wakeup feature has been enabled)
> There are two ports with the status "power",  and I do not know how to
> make it suspended yet. Can you help more ?

That is the root hub created by the linux kernel, not the hub emulated
by qemu.  If you hook up just a single device no hob is needed.

cheers,
  Gerd