On Saturday 22 April 2006 10:49 pm, Peter.Chen wrote:
>
> I can get the ep0->name which i assigned at static unsigned __init
> dm320_ep_setup routine.But list_empty(&ep0->queue)) is true,it means
> there is no item at ep0 list.I do INIT_LIST_HEAD(&ep->queue) for every
> ep.Why this would happen?
Right, there's at most one entry in that queue. The event sequence is:
(1) EP0 IRQ for SETUP packet
(2) IRQ handler readds that packet, issues setup() to gadget driver
(3) setup() either:
* returns negative/error, causing immediate protocol stall
* calls usb_ep_set_halt(), either immediately or later after
returning 0/in-progress ... also causes a protocol stall
* calls usb_ep_queue(), either immediately or later after
returning 0/in-progress ... reads or writes that data
buffer, then reports completion of that single usb_request.
(4) EP0 IRQs for DATA packet(s), if any, to load/unload the buffer
(5) EP0 IRQs for STATUS transfer
You imply you're at (2), without having issued the setup() upcall yet.
> I look through other udc programs(i base on them) at kernel tree,i find
> there is not place to add item for ep list except for xxx_ep_quene
> routine,as there
> are:
> if (likely (req != 0))
> list_add_tail(&req->queue, &ep->queue);
> Then,then the xxx_ep_quene will be invoked?
See above; yes, all the gadget drivers call that in response to setup().
Sounds like you're not doing that upcall.
- Dave
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