Has anyone had an opportunity to look at the following problem yet? I'd really
appreciate some help. If I'm doing something wrong, I've been unable to spot
it.
----- Forwarded message from Dave Mielke <[EMAIL PROTECTED]> -----
Date: Wed, 31 Dec 2003 17:12:15 -0500
From: Dave Mielke <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
Subject: usbfs urb reap problem.
Hi:
I'm getting no response at all when trying to reap a URB via usbfs. If this
isn't the right place to ask this question then would someone please let me
know what might be a more appropriate place. Here are the details.
I'm using the kernel which comes with Fedora Core 1.0.
rpm -q kernel
kernel-2.4.22-1.2129.nptl
uname...
-i i386
-m i686
-o GNU/Linux
-p athlon
-r 2.4.22-1.2129.nptl
-v #1 Mon Dec 1 08:46:47 EST 2003
My modules.conf file contains:
alias usb-controller usb-ohci
alias usb-controller1 ehci-hcd
I'm trying to read data from an interrupt endpoint. It's entry in
/proc/bus/usb/devices is:
E: Ad=81(I) Atr=03(Int.) MxPS= 2 Ivl=255ms
The routine, and the call to it, whidch I use to submit the URB are as follows:
struct usbdevfs_urb *
usbSubmitRequest (
UsbDevice *device, // ->file contains open usbfs file descriptor
unsigned char endpoint, // 0X81
unsigned char type, // USBDEVFS_URB_TYPE_INTERRUPT
void *buffer, // NULL
int length, // 0X100
unsigned int flags, // 0
void *data // address of list element pointing to urb
) {
struct usbdevfs_urb *urb;
if ((urb = malloc(sizeof(*urb) + length))) {
memset(urb, 0, sizeof(*urb));
urb->endpoint = endpoint;
urb->type = type;
urb->buffer = urb + 1;
if (buffer) memcpy(urb->buffer, buffer, length);
urb->buffer_length = length;
urb->flags = flags;
urb->signr = 0;
urb->usercontext = data;
if (ioctl(device->file, USBDEVFS_SUBMITURB, urb) != -1) return urb;
free(urb);
}
return NULL;
}
Submitting the URB works fine. This is how I try to reap it:
struct usbdevfs_urb *
usbReapRequest (
UsbDevice *device, // ->file contains open usbfs file descriptor
int wait // 1
) {
struct usbdevfs_urb *urb;
printf("reaping\n");
if (ioctl(device->file,
wait? USBDEVFS_REAPURB: USBDEVFS_REAPURBNDELAY,
&urb) == -1) {
urb = NULL;
} else if (!urb) {
errno = EAGAIN;
}
printf("reaped\n");
return urb;
}
The line "reaping" is printed, but the line "reaped" isn't. It appears,
therefore, that the USBDEVFS_REAPURB is waiting forever even when I know that
the device has pending input data. What might I be doing wrong? Thanks.
--
Dave Mielke | 2213 Fox Crescent | I believe that the Bible is the
Phone: 1-613-726-0014 | Ottawa, Ontario | Word of God. Please contact me
EMail: [EMAIL PROTECTED] | Canada K2A 1H7 | if you're concerned about Hell.
http://familyradio.com/ | http://mielke.cc/bible/
----- End forwarded message -----
--
Dave Mielke | 2213 Fox Crescent | I believe that the Bible is the
Phone: 1-613-726-0014 | Ottawa, Ontario | Word of God. Please contact me
EMail: [EMAIL PROTECTED] | Canada K2A 1H7 | if you're concerned about Hell.
http://familyradio.com/ | http://mielke.cc/bible/
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