From: Alan Stern <[EMAIL PROTECTED]>
>
> I've tried to reset all endpoints (0,5 and 7) and rescan the usb bus once
> the firmware is uploaded and before sending the first control message. But
> it doesn't solve the problem : I still get the USB control message timeouts.
Do you call usb_reset_device()?
I've tried to use usb_reset() from libusb. I use the following code :
usb_release_interface(adsl_handle, 0); usb_release_interface(adsl_handle, 2);
usb_reset(adsl_handle);
sleep(1);
if (usb_find_busses() < 0)
{
printf(gettext("Error: I can't find busses\n"));
return -1;
}
if (usb_find_devices() < 0)
{
printf(gettext("Error: I can't find devices\n"));
return -1;
}/* search first ADSL USB modem */
bus = usb_busses;
goon = 1;
while (bus && goon)
{
dev = bus->devices;
while (dev && goon)
{
tmodem = check_modem(dev->descriptor.idVendor, dev->descriptor.idProduct);
if (tmodem > 0)
{
goon = 0;
adsl_dev = dev;
}
else
dev = dev->next;
}
if (goon)
bus = bus->next;
}
if (adsl_dev == NULL)
{
printf(gettext("Error: I didn't find ADSL modem\n"));
return -1;
}
printf(gettext("I found ADSL modem with VendorID = %04x & ProductID = %04x\n"), adsl_dev->descriptor.idVendor, adsl_dev->descriptor.idProduct);
/* connect to ADSL modem */
adsl_handle = usb_open(adsl_dev);
if (adsl_handle == NULL)
{
printf(gettext("Error: Couldn't get device handle for ADSL modem\n"));
return -1;
}
It is able to find the ADSL Modem.
But the call to usb_open(adsl_dev) fails: it returns NULL.
The program stops with the message "Error: Couldn't get device handle for ADSL modem".
Is this how I'm supposed to use usb_reset() ?
That doesn't seem likely -- if the firmware was buggy it probably wouldn't work with any kernel. But it might be worthwhile doing a detailed comparison of 2.4.21-pre3 and 2.4.21-pre4 to try and find the differences.
The problem happens between 2.4.21-pre4 and pre5. The following patch breaks things :
--- include/linux/usb.h.orig 2003-11-12 23:39:28.000000000 +0100 +++ include/linux/usb.h 2003-11-12 23:41:13.000000000 +0100 @@ -996,9 +996,9 @@ #define usb_pipebulk(pipe) (usb_pipetype((pipe)) == PIPE_BULK)
/* The D0/D1 toggle bits ... USE WITH CAUTION (they're almost hcd-internal) */ -#define usb_gettoggle(dev, ep, out) (((dev)->toggle[out]
(ep)) & 1) -#define usb_dotoggle(dev, ep, out) ((dev)->toggle[out] ^= (1 << (ep))) -#define usb_settoggle(dev, ep, out, bit) ((dev)->toggle[out] = ((dev)->toggle[out] & ~(1 << (ep))) | ((bit) << (ep))) +#define usb_gettoggle(dev, ep, out) (((dev)->toggle[out]
ep) & 1) +#define usb_dotoggle(dev, ep, out) ((dev)->toggle[out] ^= (1 << ep)) +#define usb_settoggle(dev, ep, out, bit) ((dev)->toggle[out] = ((dev)->toggle[out] & ~(1 << ep)) | ((bit) << ep))
/* Endpoint halt control/status ... likewise USE WITH CAUTION */ #define usb_endpoint_running(dev, ep, out) ((dev)->halted[out] &= ~(1 << (ep)))
Cheers,
Mathias Gug
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