11. Both ir-kbd-i2c and lirc_zilog provide support for RX events. 2The 'tx_only' lirc_zilog module parameter will allow ir-kbd-i2c 3and lirc_zilog to coexist in the kernel, if the user requires such a set-up. 4However the IR unit will not work well without coordination between the 5two modules. A shared mutex, for transceiver access locking, needs to be 6supplied by bridge drivers, in struct IR_i2_init_data, to both ir-kbd-i2c 7and lirc_zilog, before they will coexist usefully. This should be fixed 8before moving out of staging. 9 102. References and locking need careful examination. For cx18 and ivtv PCI 11cards, which are not easily "hot unplugged", the imperfect state of reference 12counting and locking is acceptable if not correct. For USB connected units 13like HD PVR, PVR USB2, HVR-1900, and HVR1950, the likelyhood of an Ooops on 14unplug is probably great. Proper reference counting and locking needs to be 15implemented before this module is moved out of staging. 16 173. The binding between hdpvr and lirc_zilog is currently disabled, 18due to an OOPS reported a few years ago when both the hdpvr and cx18 19drivers were loaded in his system. More details can be seen at: 20 http://www.mail-archive.com/linux-media@vger.kernel.org/msg09163.html 21More tests need to be done, in order to fix the reported issue. 22 234. In addition to providing a shared mutex for transceiver access 24locking, bridge drivers, if able, should provide a chip reset() callback 25to lirc_zilog via struct IR_i2c_init_data. cx18 and ivtv already have routines 26to perform Z8 chip resets via GPIO manipulations. This will allow lirc_zilog 27to bring the chip back to normal when it hangs, in the same places the 28original lirc_pvr150 driver code does. This is not strictly needed, so it 29is not required to move lirc_zilog out of staging. 30 315. Both lirc_zilog and ir-kbd-i2c support the Zilog Z8 for IR, as programmed 32and installed on Hauppauge products. When working on either module, developers 33must consider at least the following bridge drivers which mention an IR Rx unit 34at address 0x71 (indicative of a Z8): 35 36 ivtv cx18 hdpvr pvrusb2 bt8xx cx88 saa7134 37 38