Hey, to make it short I had a discussion about locking for hybrid devices and I looked at some source code but I didn't find what I was looking for. My situation: I have a USB hybrid device (which is supported by the em28xx/em2880-dvb module which is available at http://linuxtv.org/hg/~mrechberger/v4l-dvb) that only supports one mode at a time, Mauro pointed out that he wants both subsystems beeing registered all the time and I also agree with that. A gpio write controls which device will show up on the i2c bus. Either the analogue videodecoder or the dvb-t demodulator, both will never show up at the same time. At the moment people have to load the em28xx module using "modprobe em28xx device_mode=1" to get the firmware uploaded correctly and the DVB-T demodulator shown up on the i2c bus, "modprobe em2880-dvb" will finally make DVB-T work. The problem is it shouldn't be possible to open a v4l device (/dev/video[n]) and a DVB device concurrently, one should return -EBUSY. Goal is to make that dynamically as possible, so if someone closes the DVB-T device and opens the analogue device file I want to reupload the firmware set up the device correctly and make only analogue TV work. While using analogue TV all registered DVB-T files should return -EBUSY. Is there already a solution for such a problem available? thanks, Markus _______________________________________________ linux-dvb@xxxxxxxxxxx http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
