Alan Stern wrote:
Again, seems like NAK is the answer. And the way to make the gadget stop
NAKing is to provide some data for it to deliver to the host: submit
a request to that IN endpoint, with its data buffer.
If a STALL is the right response, then halt the endpoint. Otherwise the
only
Halt endpoints by doing a wrong direction I/O ... read from an IN endpoint
(instead of writing to the host), or write to an OUT endpoint (instead of
reading what it wrote). This idiom avoids use of ioctls, and makes use
of a code path that would otherwise just return an error.
Oliver Neukum wrote:
Think of it instead as portability. The main barrier to being
able to use this should be knowing USB -- not whether your
chosen programming environment supports POSIX-specific APIs.
Remember that _today_ you can write fully realistic user mode
gadget drivers in C, C++,
Am Donnerstag, 7. August 2003 21:37 schrieb David Brownell:
Oliver Neukum wrote:
Halt endpoints by doing a wrong direction I/O ... read from an IN endpoint
(instead of writing to the host), or write to an OUT endpoint (instead of
reading what it wrote). ...
That depends on whether you
On Wed, Aug 06, 2003 at 10:48:22PM +0200, Oliver Neukum wrote:
Am Mittwoch, 6. August 2003 22:09 schrieb David Brownell:
Alan Stern wrote:
David:
A few things have come while planning my gadget driver.
The gadgetfs API still looks a bit preliminary. Judging by the source,
Alan Stern wrote:
David:
A few things have come while planning my gadget driver.
The gadgetfs API still looks a bit preliminary. Judging by the source,
there doesn't even appear to be any way to halt an endpoint! Anyway, I
decided not to use it; the performance penalties would make it a bad
Am Mittwoch, 6. August 2003 22:09 schrieb David Brownell:
Alan Stern wrote:
David:
A few things have come while planning my gadget driver.
The gadgetfs API still looks a bit preliminary. Judging by the source,
there doesn't even appear to be any way to halt an endpoint! Anyway, I
Oliver Neukum wrote:
Halt endpoints by doing a wrong direction I/O ... read from an IN endpoint
(instead of writing to the host), or write to an OUT endpoint (instead of
reading what it wrote). ...
That depends on whether you want to design a clean API, or you are
driven by avoiding ioctl, which
Greg KH wrote:
On Wed, Aug 06, 2003 at 10:48:22PM +0200, Oliver Neukum wrote:
Am Mittwoch, 6. August 2003 22:09 schrieb David Brownell:
Halt endpoints by doing a wrong direction I/O ... read from an IN endpoint
(instead of writing to the host), or write to an OUT endpoint (instead of
reading what
I'm not sure if it's worth discussing this any farther, since the
controller hardware probably won't support it, but ...
On Wed, 6 Aug 2003, David Brownell wrote:
Alan Stern wrote:
A related issue has to do with setting the HALT feature when the host
tries to read/write too much. The
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