Comment # 23 on bug 900273 from Oliver Neukum

(In reply to Jon Nelson from comment #22)
> Doesn't seem to be available:
> 
> 
> linux:~ # lsmod | grep rtsx
> rtsx_usb_sdmmc         27787  0 
> mmc_core              133468  1 rtsx_usb_sdmmc
> rtsx_usb_ms            18697  0 
> memstick               16966  1 rtsx_usb_ms
> rtsx_usb               20987  2 rtsx_usb_sdmmc,rtsx_usb_ms
> mfd_core               13435  2 lpc_ich,rtsx_usb
> linux:~ # find /sys | grep rtsx | grep events
> linux:~ #

These tests are no good. This line:

> mmc_core              133468  1 rtsx_usb_sdmmc

tells you that the rtsx driver uses the generic mmc layer. So there will be a
generic mmc device in /sys/block.
Please look again. (You might need a medium present in the device for this to
work)