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Is there a way to restrict gadgetfs to Full Speed?

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I have two USB devices (host and device) that both support high speed. I am trying to emulate a legacy device on gadgetfs which is full speed. The host device unfortunately complains that there is something odd when it connects to the high speed device. I cannot change anything on the host. my device is a Raspberry Pi zero W.

I can not find any way to restrict the gadgetfs device to connect (negotiate?) as a full speed device. Short term I am using a usb 1.1 hub to sovle the problem. Long term this is not a viable solution.

The only reference I have found for this is in Limit USB gadget driver speed, and I would prefer not to have go into the kernel and modify the drivers.

Does anyone have any suggestion on how I could achieve this?

linux usb driver

share|improve this question

edited Apr 9 at 20:45

mw.

asked Mar 8 at 20:37

mw.mw.

6611

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Maybe I did not elaborate the details enough, this is a programming issue. I am writing a linux userspace gadgetfs driver to emulate the device and am trying to limit the the gadgetfs interface to HS. The gadgetfs API has very limited documentations. I can not find any references as to how to limit gadgetfs connections speeds. I was hoping there was a way to do this with gadgetfs, and if not some other alternative.
  
  – mw.
  Mar 11 at 12:33
  

  
  
  
  

add a comment | 

0

I have two USB devices (host and device) that both support high speed. I am trying to emulate a legacy device on gadgetfs which is full speed. The host device unfortunately complains that there is something odd when it connects to the high speed device. I cannot change anything on the host. my device is a Raspberry Pi zero W.

I can not find any way to restrict the gadgetfs device to connect (negotiate?) as a full speed device. Short term I am using a usb 1.1 hub to sovle the problem. Long term this is not a viable solution.

The only reference I have found for this is in Limit USB gadget driver speed, and I would prefer not to have go into the kernel and modify the drivers.

Does anyone have any suggestion on how I could achieve this?

linux usb driver

share|improve this question

edited Apr 9 at 20:45

mw.

asked Mar 8 at 20:37

mw.mw.

6611

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Maybe I did not elaborate the details enough, this is a programming issue. I am writing a linux userspace gadgetfs driver to emulate the device and am trying to limit the the gadgetfs interface to HS. The gadgetfs API has very limited documentations. I can not find any references as to how to limit gadgetfs connections speeds. I was hoping there was a way to do this with gadgetfs, and if not some other alternative.
  
  – mw.
  Mar 11 at 12:33
  

  
  
  
  

add a comment | 

I have two USB devices (host and device) that both support high speed. I am trying to emulate a legacy device on gadgetfs which is full speed. The host device unfortunately complains that there is something odd when it connects to the high speed device. I cannot change anything on the host. my device is a Raspberry Pi zero W.

I can not find any way to restrict the gadgetfs device to connect (negotiate?) as a full speed device. Short term I am using a usb 1.1 hub to sovle the problem. Long term this is not a viable solution.

The only reference I have found for this is in Limit USB gadget driver speed, and I would prefer not to have go into the kernel and modify the drivers.

Does anyone have any suggestion on how I could achieve this?

linux usb driver

share|improve this question

edited Apr 9 at 20:45

mw.

asked Mar 8 at 20:37

mw.mw.

6611

share|improve this question

edited Apr 9 at 20:45

mw.

asked Mar 8 at 20:37

mw.mw.

6611

share|improve this question

edited Apr 9 at 20:45

mw.

asked Mar 8 at 20:37

mw.mw.

6611

asked Mar 8 at 20:37

mw.mw.

6611

asked Mar 8 at 20:37

mw.mw.

6611