On Tue, 23 Aug 2011 15:30:39 +0100, Hennerich, Michael wrote > malas wrote on 2011-08-23: > > On Tue, 23 Aug 2011 15:07:22 +0100, Jonathan Cameron wrote > >> On 08/23/11 14:48, malas wrote: > >>> On Tue, 23 Aug 2011 14:41:57 +0100, Jonathan Cameron wrote > >>>> On 08/23/11 14:24, malas wrote: > >>>>> On Tue, 23 Aug 2011 13:58:34 +0100, Jonathan Cameron wrote > >>>>>> On 08/23/11 13:43, malas wrote: > >>>>>>> YES : Gregs updated kernel taken from link below: > >>>>>>> > >>>>>>> http://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging- > > 2.6.git > >>>>>> Right now that's pretty much mainline. > >>>>>> > >>>>>> See comments below and please reply inline as it makes this sort > >>>>>> of discussion much easier to follow. > >>>>>>> > >>>>>>> > >>>>>>> On Tue, 23 Aug 2011 13:39:12 +0100, Jonathan Cameron wrote > >>>>>>>> On 08/23/11 13:17, malas wrote: > >>>>>>>>> > >>>>>>>>> > >>>>>>>>> Sorry, I did not explicitly mention that. I did use the new > > staging kernel > >>> referred by > >>>>>>>>> Michael Hennerich and integrated with 2010RC5 uclinux dist . > >>>>>>>> > >>>>>>>> Hmm. As in current contents of Greg KH's staging/staging-next? > >>>>>>>> > >>>>>>>> I'll assume so... See below. > >>>>>>>> > >>>>>>>>> > >>>>>>>>> On Tue, 23 Aug 2011 12:39:53 +0100, Hennerich, Michael wrote > >>>>>>>>>> malas wrote on 2011-08-23: > >>>>>>>>>>> > >>>>>>>>>>> > >>>>>>>>>>> Dear Jonathan Cameron, > >>>>>>>>>>> > >>>>>>>>>>> The kernel version I am using is : > >>>>>>>>>> > >>>>>>>>>> Didn't you say that you use the staging kernel? > >>>>>>>>>> > >>>>>>>>>> > >>>>>>>>> > >>>>>>> > >>>>> > >>> > > http://blackfin.uclinux.org/gf/project/uclinux- > > dist/forum/?_forum_action=MessageReply&message_id=102839&action=ForumBr > > owse > >>>>>>>>>> > >>>>>>>>>> Or copied drivers/staging/iio over to your Blackfin kernel tree? > >>>>>>>>>> > >>>>>>>>>>> > >>>>>>>>>>> ----------------------------------------------------------- > >>>>>>>>>>> ---------- > >>>>>>>>>>> > >>>>>>>>>>> midas@ubuntu:~/Mala/Telemedicine/uclinux_source/uc2010_source/u > >>>>>>>>>>> clinux/2 010R1$ svn info Path: . URL: > >>>>>>>>>>> svn://blackfin.uclinux.org/uclinux-dist/branches/2010R1 > >>>>>>>>>>> Repository Root: svn://blackfin.uclinux.org/uclinux-dist > >>>>>>>>>>> Repository UUID: 3e2a5524-39e8-4cb9-84a9-c49da69cba3a > >>>>>>>>>>> Revision: 10161 Node Kind: directory Schedule: normal Last > >>>>>>>>>>> Changed Author: vapier Last Changed Rev: 10136 Last Changed > >>>>>>>>>>> Date: 2011-04-02 22:36:15 +0530 (Sat, 02 Apr 2011) > >>>>>>>>>>> ----------------------------------------------------------- > >>>>>>>>>>> ---------- > >>>>>>>>>>> > >>>>>>>>>>> Regards > >>>>>>>>>>> Mala > >>>>>>>>>>> > >>>>>>>>>>> On Tue, 23 Aug 2011 12:21:25 +0100, Jonathan Cameron wrote > >>>>>>>>>>>> On 08/23/11 09:18, malas wrote: > >>>>>>>>>>>>> > >>>>>>>>>>>>> Dear Michael Hennerich, > >>>>>>>>>>>>> > >>>>>>>>>>>>> > >>>>>>>>>>>>> I shall post iio quesris in this mail list as per your > >>>>>>>>>>>>> suggestions. > >>>>>>>>>>>>> > >>>>>>>>>>>>> AD7793 driver is built into kernel. The chip gets configured > >>>>>>>>>>>>> and am able to read data on continuous mode via spi > >>>>>>>>>>>>> interface using ad7793 driver at kernel level. > >>>>>>>>>>>>> > >>>>>>>>>>>>> While testing userspace test iio-ring to read data from ring > >>>>>>>>>>>>> buffer, generic_buffer code was executed, it proceeds till > >>>>>>>>>>>>> opening /sys/bus/iio/devices/device0:buffer0 and Read call > >>>>>>>>>>>>> fails. > >>>>>>>>>>>> Question 1: What's the kernel and where did you get it from? > >>>>>>>>>>>> (Interfaces are moving fast so it's plausible you've fallen > >>>>>>>>>>>> in a hole where userspace wasn't matching kernelspace). > >>>>>>>>>>>>> > >>>>>>>>>>>>> In fs I can list the iio device ad7793 with following > >>>>>>>>>>>>> properties get/set. > >>>>>>>>>>>>> > >>>>>>>>>>>>> root:/> ls /sys/bus/iio/devices/device0\:buffer0/ > >>>>>>>>>>>>> bytes_per_datum enable power subsystem dev > >>>>>>>>>>>>> length scan_elements uevent root:/> > >>>>>>>>>>>>> > >>>>>>>>>>>>> I find access0 and event0 missing in this list. Is that > > the reason > >>>>>>>>>>> for read() fails. > >>>>>>>>>>>> Yes. Question is why and without kernel version I don't know > >>>>>>>>>>>> where to look I'm afraid. > >>>>>>>> Ah, this does look like a missmatch in interfaces between > >>>>>>>> userspace and kernel. > >>>>>>>> > >>>>>>>> At this point in time we have scrapped the event0 chrdev (done > >>>>>>>> via polling on the access one) and the access one has be > >>>>>>>> flattened into device0\:buffer0/ (read dev). > >>>>>>>> > >>>>>>>> Looks like the generic_buffer.c example does line up though. > >>>>>>>> Where did the 'test iio-ring' come from? Is that one yours > >>>>>>>> Michael? > >>>>> > >>>>> > >>>>> iio-ring.c under uclinux2010/user/blkfin-test/iio-ring-test. The > >>>>> file is in the attached. I did not use that since i didn't find > >>>>> access0 or event0 files under /sys/bus/iio/devices/device0:buffer0. > >>>>> > >>>>> I have tested with the generic_buffer.c example (under > >>>>> iio/documentaion folder) to get Ad7793 received samples to user > >>>>> space from ring buffer. The app opens: /dev/device0:buffer0 for poll > >>>>> and reading samples. Is the device name for the open() correct. > >>>> Yes - that should be right. > >>> ************************* > >>> Open fails for "/dev/device0:buffer0" device name > >>> I tried changing to "/sys/bus/iio/devices/device0:buffer0"- open() > > succeeded then but > >>> then read fails. > >> Read must be the one under dev. The other is a directory with > >> description of the buffer. > >> > >> What is the error on the open of /dev/device0:buffer0? > > > > ERROR => > > Going to open access file /dev/device0:buffer0 > > Failed to open /dev/device0:buffer0 > > open returned fp as -1 > > > > I think I asked you before to check if /dev/device0:buffer0 exists. > And I guess is does not - so you have to create it. > > Greetings, > Michael I created a directory "device0:buffer0" under /dev. Open() now succeeds, but read() is still failing, returns readSize as -1. I have not initialised any trigger.Should I? I am running generic_buffer specifying only driver name as: root> generic_buffer -n ad7793 -mala > > -- > Analog Devices GmbH Wilhelm-Wagenfeld-Str. 6 80807 Muenchen > Sitz der Gesellschaft: Muenchen; Registergericht: Muenchen HRB 40368; > Geschaeftsfuehrer:Dr.Carsten Suckrow, Thomas Wessel, William A. 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