On 02/27/2013 06:15 PM, Chris Micali wrote: > Lars, > > Thanks.. when I write 1 to scan_elements/in_voltage0_en via iio_cmdserv i get -2, from shell (echo 1>) i see write error: Invalid argument. No output in dmesg that indicates what the error is/could be though. > > -c In your driver you commented out the INDIO_BUFFER_TRIGGERED mode flag, did you add that back? Without it this won't work. - Lars > > > On Wednesday, February 27, 2013 at 11:34 AM, Lars-Peter Clausen wrote: > >> On 02/27/2013 05:21 PM, Chris Micali wrote: >>> Hi Lars, >>> Thanks a lot for getting back to me. I've attached my code - it's pretty simple, I just copied an existing driver. As I mentioned individual reads are working fine (if i cat in_voltage0_raw) but buffered reads are failing. I've tracked the issue to industrialio-buffer.c in iio_compute_scan_bytes() which always returns zero because, i believe, the mask is 0. I haven't been able to find any docs on what 'scan masks' mean but I have seen a few drivers that supply available scan masks. Should I be specifying scan masks? >>> Thanks! >>> -chris >>> >> >> >> Hi Chris, >> >> You need to enable the channels you want to sample in sysfs. If you are >> using the command server you can for example do this by doing a 'write >> ads... scan_elements/in_voltage0_en' >> >> - Lars >> >> >>> >>> >>> On Wednesday, February 27, 2013 at 11:07 AM, Lars-Peter Clausen wrote: >>> >>>> On 02/26/2013 08:56 PM, Chris Micali wrote: >>>>> Hello Lars, >>>>> >>>>> I'm doing a bit of hacking on a IIO driver based on some of your drivers on a 3.8 kernel (specifically writing a driver for a TI SPI adc.) I've been able to get a driver up and working such that I can read directly from the in_voltage0_raw on sysfs and get the correct values but I can't seem to get buffered access working (via iio_cmdsrv.) I've had a hard time finding any docs on this stuff and I was wondering if you could give me any pointers on where to look or who else perhaps to ask about this stuff? Any pointers would be very much appreciated! >>>>> >>>>> Thanks, >>>>> Chris >>>>> >>>> >>>> >>>> >>>> >>>> Hi, >>>> >>>> I'm afraid except for the the documentation in >>>> drivers/staging/iio/Documentation/, the kernel doc comments and the skeleton >>>> driver (drivers/staging/iio/iio_simple_dummy*) there is not much additional >>>> documentation available. >>>> >>>> The general place to ask questions about IIO is the IIO mailinglist. I've >>>> put it on CC, hope you don't mind. >>>> >>>> I think we can help you best if you post your code. >>>> >>>> - Lars > > -- To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
