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[Qemu-devel] usb-host quirks

From: Michael Buesch
Subject: [Qemu-devel] usb-host quirks
Date: Tue, 2 Feb 2010 14:42:06 +0100
User-agent: KMail/1.9.9


I've got a buggy device that needs a special workaround to be usable under
host-usb access. The device really doesn't like being reset via USBDEVFS_RESET. 
immediatenly locks up the device firmware or whatever. It won't respond 
properly anymore.
With the following patch it works fine, though.

So I was wondering what the accepted way was to get these quirks upstream into 
the qemu
source tree. Is usb-linux.c the correct place, or should we put the quirk into
a different place?

 usb-linux.c |    4 ++++
 1 file changed, 4 insertions(+)

--- qemu.orig/usb-linux.c
+++ qemu/usb-linux.c
@@ -389,6 +389,10 @@ static void usb_host_handle_reset(USBDev
     dprintf("husb: reset device %u.%u\n", s->bus_num, s->addr);
+    if (((s->descr[8] << 8) | s->descr[9]) == 0x2471 &&
+        ((s->descr[10] << 8) | s->descr[11]) == 0x0853)
+        return;
     ioctl(s->fd, USBDEVFS_RESET);
     usb_host_claim_interfaces(s, s->configuration);

Greetings, Michael.

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