It is driver for MSi3101 USB SDR designed by Mirics. I will pull-request that soon for the Kernel 3.12 staging. It is not ready for mainline as there is multiple issues. Biggest issues are; missing API controls and stream format conversions should be implemented by libv4l2. That driver is MSi3101 design, which consists of two chips: 1) USB ADC called MSi2500 and RF-tuner called MSi001. So I will split that to the two parts later... USB ADC is a state of the art in the reverse-engineering as I was not able to get documentation or other needed info, gah :-( Anyhow, it was quite interesting as a point of learn the first USB ADC I have seen. Biggest challenge was to discover how to calculate ADC sampling rate. It was a typical Fractional-N PLL as all these are nowadays. First I calculated sampling rates by the driver, after that brute forced PLL registers with a different values and look what kind of data rate it is outputting :) Nice trick - but took a lot of time. Re-engineering such USB ADC is still a little bit easier than typical DTV demodulator in my experience. Another, not so hard, issue to mention was understand different stream formats. Chip seems to offer multiple formats, best one I found seems to offer even 14-bit resolution. Special thanks to University Oulu HAM club, Oulun Teekkarien Radiokerho, OH8TA, for the support I received. You rule! Antti Palosaari (16): Mirics MSi3101 SDR Dongle driver msi3101: sample is correct term for sample msi3101: fix sampling rate calculation msi3101: add sampling mode control msi3101: enhance sampling results msi3101: fix stream re-start halt msi3101: add 2040:d300 Hauppauge WinTV 133559 LF msi3101: add debug dump for unknown stream data msi3101: correct ADC sampling rate calc a little msi3101: improve tuner synth calc step size msi3101: add support for stream format "252" I+Q per frame msi3101: init bits 23:20 on PLL register msi3101: fix overflow in freq setting msi3101: add stream format 336 I+Q pairs per frame msi3101: changes for tuner PLL freq limits msi3101: a lot of small cleanups drivers/staging/media/Kconfig | 2 + drivers/staging/media/Makefile | 1 + drivers/staging/media/msi3101/Kconfig | 3 + drivers/staging/media/msi3101/Makefile | 1 + drivers/staging/media/msi3101/sdr-msi3101.c | 1822 +++++++++++++++++++++++++++ 5 files changed, 1829 insertions(+) create mode 100644 drivers/staging/media/msi3101/Kconfig create mode 100644 drivers/staging/media/msi3101/Makefile create mode 100644 drivers/staging/media/msi3101/sdr-msi3101.c -- 1.7.11.7 -- 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
