On Fri, Jun 26, 2009 at 2:34 PM, Andy Walls<awalls@xxxxxxxxx> wrote: > Hmm, that sure sounds like a V4L2 spec violation. From the V4L2 close() > description: > > "Closes the device. Any I/O in progress is terminated and resources > associated with the file descriptor are freed. However data format > parameters, current input or output, control values or other properties > remain unchanged." > > > Regards, > Andy I have no idea how that would work with power management. It would mean that all the tuners and demod drivers which don't maintain state across powerdown would have to maintain some sort of cache of all of the programmed registers, and we would need to add some sort of "wakeup" callback which reprograms the device accordingly (currently we have a sleep callback but not a corresponding callback to wake the device back up). As a requirement, it might have been suitable for PCI cards where you don't care about power management (and therefore never power anything down), but I don't know how practical that is for USB or minicard devices where power management is critical because you're on a battery. Devin -- Devin J. Heitmueller - Kernel Labs http://www.kernellabs.com -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
