I'd like to present so-called "reset patch" for revision 64 of split-branch.
Enjoy
diff -u old/uvc_driver.c new/uvc_driver.c
--- old/uvc_driver.c 2006-11-04 22:14:32.000000000 +0300
+++ new/uvc_driver.c 2006-11-04 02:17:08.000000000 +0300
@@ -147,6 +147,52 @@
return 0;
}
+
+/*
+ * Reset and Re-Initialize video device
+ */
+int uvc_video_reinit(struct uvc_video_device *video)
+{
+ int ret;
+
+ if ((ret = uvc_usb_reset(video->dev)) < 0)
+ return ret;
+
+ if ((ret = uvc_set_video_ctrl(video, &video->streaming->ctrl, 0)) < 0) {
+ uvc_printk(KERN_DEBUG, "uvc_video_reinit: Unable to commit
format "
+ "(%d).\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+
+int uvc_usb_reset(struct uvc_device *dev)
+{
+ int l, ret;
+
+ l = usb_lock_device_for_reset(dev->udev, dev->intf);
+
+ if (l >= 0) {
+ ret = usb_reset_device(dev->udev);
+ if (l)
+ usb_unlock_device(dev->udev);
+ }
+ else
+ ret = -EBUSY;
+
+ if (ret)
+ uvc_printk(KERN_DEBUG, "uvc_usb_reset: Unable to reset usb
device"
+ "(%d).\n", ret);
+ else
+ dev->state &= ~UVC_DEV_IOERROR;
+
+ return ret;
+}
+
+
+
/* Simplify a fraction using a simple continued fraction decomposition. The
* idea here is to convert fractions such as 333333/10000000 to 1/30 using
* 32 bit arithmetic only. The algorithm is not perfect and relies upon two
@@ -1198,9 +1244,19 @@
* parameters.
*/
if ((ret = uvc_video_init(&dev->video)) < 0) {
- uvc_printk(KERN_ERR, "Failed to initialize the device "
- "(%d).\n", ret);
- return ret;
+
+ uvc_printk(KERN_ERR, "Failed to initialize the device, "
+ "(%d). trying to reset ...\n", ret);
+
+ if ((ret = uvc_usb_reset(dev)))
+ return ret;
+
+ if ((ret = uvc_video_init(&dev->video)) < 0) {
+ uvc_printk(KERN_ERR, "Failed to initialize the device "
+ "(%d).\n", ret);
+ return ret;
+ }
+
}
/* Register the device with V4L. */
diff -u old/uvc_v4l2.c new/uvc_v4l2.c
--- old/uvc_v4l2.c 2006-11-04 22:14:32.000000000 +0300
+++ new/uvc_v4l2.c 2006-11-04 21:30:52.000000000 +0300
@@ -434,6 +434,10 @@
mutex_unlock(&video->queue.mutex);
}
+ /* leave usb device in a clean state */
+ if (video->dev->state & UVC_DEV_IOERROR)
+ uvc_video_reinit(video);
+
/* Release the file handle. */
uvc_dismiss_privileges(handle);
kfree(handle);
diff -u old/uvc_video.c new/uvc_video.c
--- old/uvc_video.c 2006-11-04 22:14:32.000000000 +0300
+++ new/uvc_video.c 2006-11-04 22:22:42.000000000 +0300
@@ -45,6 +45,7 @@
uvc_printk(KERN_ERR, "Failed to query (%u) UVC control %u "
"(unit %u) : %d (exp. %u).\n", query, cs, unit, ret,
size);
+ dev->state |= UVC_DEV_IOERROR;
return -EIO;
}
diff -u old/uvcvideo.h new/uvcvideo.h
--- old/uvcvideo.h 2006-11-04 22:14:32.000000000 +0300
+++ new/uvcvideo.h 2006-11-04 02:16:51.000000000 +0300
@@ -511,6 +511,7 @@
enum uvc_device_state {
UVC_DEV_DISCONNECTED = 1,
+ UVC_DEV_IOERROR = 2,
};
struct uvc_device {
@@ -664,6 +665,10 @@
extern struct usb_host_endpoint *uvc_find_endpoint(
struct usb_host_interface *alts, __u8 epaddr);
+
+extern int uvc_video_reinit(struct uvc_video_device *video);
+extern int uvc_usb_reset(struct uvc_device *dev);
+
#endif /* __KERNEL__ */
#endif
Regards, Evgeny
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