Re: [pyusb-users] Hub power control

[Karl P. <ka...@tw...>]

Well. For starters, does it _actually_ support port power control
(even ganged) or does it just say it does?

Does it work using existing tools like uhubctrl [1] or similar,
and you're just having a hard time porting to pyusb or has this
never worked?

Sincerely,
Karl Palsson

[1] https://github.com/mvp/uhubctl


Anthony An <dst...@gm...> wrote:
> I'm trying to control the power of a camera that is connected
> to a ganged port power control hub. With dev =
> usb.core.find(idVendor=0x1a40, idProduct=0x0401) and
> bmRequestTypes = [0x00, 0x01, 0x02, 0x03, 0x20, 0x21, 0x22,
> 0x23, 0x40, 0x41, 0x42, 0x43], I tried to use ctrl_transfer,
> but none of them worked. Can someone help me to figure out how
> to control the power? What I want is turning off the power, not
> just disabling the port.
> 
> 
> 
> 
> Bus 001 Device 004: ID 1a40:0401 Terminus Technology Inc.
> Device Descriptor:
>   bLength                18
>   bDescriptorType         1
>   bcdUSB               2.00
>   bDeviceClass            9 Hub
>   bDeviceSubClass         0 Unused
>   bDeviceProtocol         1 Single TT
>   bMaxPacketSize0        64
>   idVendor           0x1a40 Terminus Technology Inc.
>   idProduct          0x0401
>   bcdDevice            1.00
>   iManufacturer           0
>   iProduct                1 USB 2.0 Hub
>   iSerial                 0
>   bNumConfigurations      1
>   Configuration Descriptor:
>     bLength                 9
>     bDescriptorType         2
>     wTotalLength           25
>     bNumInterfaces          1
>     bConfigurationValue     1
>     iConfiguration          0
>     bmAttributes         0xe0
>       Self Powered
>       Remote Wakeup
>     MaxPower              100mA
>     Interface Descriptor:
>       bLength                 9
>       bDescriptorType         4
>       bInterfaceNumber        0
>       bAlternateSetting       0
>       bNumEndpoints           1
>       bInterfaceClass         9 Hub
>       bInterfaceSubClass      0 Unused
>       bInterfaceProtocol      0 Full speed (or root) hub
>       iInterface              0
>       Endpoint Descriptor:
>         bLength                 7
>         bDescriptorType         5
>         bEndpointAddress     0x81  EP 1 IN
>         bmAttributes            3
>           Transfer Type            Interrupt
>           Synch Type               None
>           Usage Type               Data
>         wMaxPacketSize     0x0001  1x 1 bytes
>         bInterval              12
> Hub Descriptor:
>   bLength               9
>   bDescriptorType      41
>   nNbrPorts             2
>   wHubCharacteristic 0x0004
>     Ganged power switching
>     Compound device
>     Ganged overcurrent protection
>     TT think time 8 FS bits
>   bPwrOn2PwrGood       50 * 2 milli seconds
>   bHubContrCurrent    100 milli Ampere
>   DeviceRemovable    0x06
>   PortPwrCtrlMask    0xff
>  Hub Port Status:
>    Port 1: 0000.0100 power
>    Port 2: 0000.0100 power
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