On Apr 13, 2007, at 12:01 PM, Alan Stern wrote:
> Depends what you mean. The kernel-build system is smart enough to
> recompile only the files you have changed (and those that depend on
> them).
> If what you changed is in a module instead of built into the main
> kernel
> binary, then only that module needs to be rebuilt. Then you can
> rmmod the
> old module and insmod the new one without even rebooting.
I had to recompile the kernel with the changes I made. In the patch
that I sent yesterday, I forgot to include the changes that I made in
the file
/include/linux/usbdevice_fs.h. I added the constant for the ioctl call:
#define USBDEVFS_GETFRAMENUM _IOW('U', 24, int)
After making these changes, recompiling the 2.6.15 kernel, and making
a quick and dirty test program, I get the following error before my
program dies:
opening card at path /dev/bus/usb/001/008
opened card: 128
errno: Inappropriate ioctl for device
So it seems that by adding the ioctl to usbdevice_fs.h isn't enough.
Is there a table somewhere else where I would need to define the
ioctl so that it's recognized by the kernel?
My changes that I've made are below:
--- linux-source-2.6.15/drivers/usb/core/devio.c 2006-03-02
16:18:38.000000000 -0500
+++ devel/drivers/usb/core/devio.c 2007-04-13 17:07:16.000000000 -0400
@@ -815,6 +815,20 @@ static int proc_getdriver(struct dev_sta
return ret;
}
+static int proc_getframenum(struct dev_state *ps, void __user *arg)
+{
+ int frame_number;
+ struct usb_device *dev = ps->dev;
+
+ frame_number = usb_get_current_frame_number(dev);
+
+ if (put_user(frame_number, (int __user *)arg))
+ return -EFAULT;
+
+ return 0;
+
+}
+
static int proc_connectinfo(struct dev_state *ps, void __user *arg)
{
struct usbdevfs_connectinfo ci;
@@ -1549,6 +1563,12 @@ static int usbdev_ioctl(struct inode *in
snoop(&dev->dev, "%s: IOCTL\n", __FUNCTION__);
ret = proc_ioctl_default(ps, p);
break;
+
+ case USBDEVFS_GETFRAMENUM:
+ snoop(&dev->dev, "%s: GETFRAMENUM\n", __FUNCTION__);
+ ret = proc_getframenum(ps, p);
+ break;
+
}
usb_unlock_device(dev);
if (ret >= 0)
--- linux-source-2.6.15/include/linux/usbdevice_fs.h 2006-03-02
16:18:41.000000000 -0500
+++ devel/include/linux/usbdevice_fs.h 2007-04-13 17:09:29.000000000
-0400
@@ -172,4 +172,5 @@ struct usbdevfs_ioctl32 {
#define USBDEVFS_CLEAR_HALT _IOR('U', 21, unsigned int)
#define USBDEVFS_DISCONNECT _IO('U', 22)
#define USBDEVFS_CONNECT _IO('U', 23)
+#define USBDEVFS_GETFRAMENUM _IOW('U', 24, int)
#endif /* _LINUX_USBDEVICE_FS_H */
----
Danny Budik
Research Engineer
Inductive Signature Technologies, Inc.
http://www.ist-traffic.com
(865) 673-9434
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