From: Danny Budik <[EMAIL PROTECTED]>
This patch (as899) adds a new ioctl to usbfs: USBDEVFS_GETFRAMENUM.
It allows user programs to obtain the current Start-Of-Frame number on
a USB bus.
Note that the values returned by the get_frame method in the various
host controller drivers are not consistent. They should be adjusted
so that they provide the actual frame number as it appears on the bus;
that is, a number incrementing by one every millisecond, ranging from 0
to 2047. That will have to be done separately; it interacts with the
start_frame values used for submitting Isochronous URBs.
Signed-off-by: Alan Stern <[EMAIL PROTECTED]>
---
Index: usb-2.6/drivers/usb/core/devio.c
===================================================================
--- usb-2.6.orig/drivers/usb/core/devio.c
+++ usb-2.6/drivers/usb/core/devio.c
@@ -831,6 +831,18 @@ static int proc_getdriver(struct dev_sta
return ret;
}
+static int proc_getframenum(struct dev_state *ps, void __user *arg)
+{
+ int frame_number;
+
+ frame_number = usb_get_current_frame_number(ps->dev);
+ if (frame_number < 0)
+ return frame_number;
+ 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;
@@ -1567,6 +1579,12 @@ 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)
Index: usb-2.6/include/linux/usbdevice_fs.h
===================================================================
--- usb-2.6.orig/include/linux/usbdevice_fs.h
+++ usb-2.6/include/linux/usbdevice_fs.h
@@ -173,4 +173,5 @@ 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 */
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