On Tue, 4 May 2010, Rob Duncan wrote: > > On May 4, 2010, at 6:49 AM, Alan Stern wrote: > > > Do you remember to write "auto" to the power/control file? > > I'm using usb_enable_autosuspend(), but explicitly writing "auto" doesn't seem to do anything. When I read the file I see that its contents are "auto". > > > It isn't. In fact, I would go so far as to say it's nearly impossible > > to have power/level without power/autosuspend. Look at the code in > > drivers/usb/core/sysfs.c and see what you think. You may want to put > > some debugging printk statements in add_power_attributes(). > > Embarrassingly, it turns out that I have been looking at the wrong place in the sysfs tree. I was looking at the interface level instead of the device level; I do see the the autosuspend file there. > > But I still do not see my driver suspend entry point being called. You will have to do some debugging to find out why your driver isn't getting suspended. A good place to start is in drivers/usb/core/driver.c:autosuspend_check(). By the way, does the power/wakeup attribute file for your device contain "enabled"? Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
