Ranran <ranshalit@xxxxxxxxx> writes: > On Tue, Sep 4, 2018 at 10:21 PM Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote: >> >> On Tue, 4 Sep 2018, Ranran wrote: >> >> > On Tue, Sep 4, 2018 at 2:36 PM Ranran <ranshalit@xxxxxxxxx> wrote: >> > > >> > > Hello, >> > > >> > > In gadgetfs documentation I find no mention of endpoints: >> > > https://www.kernel.org/doc/Documentation/usb/gadget_configfs.txt >> > > >> > > Is it possible to create endpoints using gadgetfs ? >> > > >> > >> > The question need to be phrased differently: >> > Is it possible to create HID using gadgetfs. >> >> Yes, it is (as far as I know -- I haven't actually tried to do it). >> >> > I see that it is possible to create usb device with endpoints as described here: >> > http://www.linux-usb.org/gadget/usb.c >> > But what about HID device ? How can we implement HID device using gadget ? >> >> That's a complicated question. You can't implement an HID gadget >> without first understanding the HID specification. Have you read the >> specification and do you understand it? >> >> Assuming you have, are there any specific questions you need answers >> to? >> > > > I have one more question please on this topic, juto to verify: > Seems that gadget hid (hidg) doesn't supports getfeature/setfeature ? > https://github.com/torvalds/linux/blob/master/Documentation/usb/gadget_hid.txt > Is it planned to be added ? you can always send a patch implementing it. But which specific feature are you talking about? Those are usually implemented at the UDC level. See dwc3/ep0.c, for example: static int dwc3_ep0_handle_feature(struct dwc3 *dwc, struct usb_ctrlrequest *ctrl, int set) { u32 recip; int ret; recip = ctrl->bRequestType & USB_RECIP_MASK; switch (recip) { case USB_RECIP_DEVICE: ret = dwc3_ep0_handle_device(dwc, ctrl, set); break; case USB_RECIP_INTERFACE: ret = dwc3_ep0_handle_intf(dwc, ctrl, set); break; case USB_RECIP_ENDPOINT: ret = dwc3_ep0_handle_endpoint(dwc, ctrl, set); break; default: ret = -EINVAL; } return ret; } -- balbi
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