YES : Gregs updated kernel taken from link below: http://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging-2.6.git 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=ForumBrowse > >> > >> Or copied drivers/staging/iio over to your Blackfin kernel tree? > >> > >>> > >>> --------------------------------------------------------------------- > >>> midas@ubuntu:~/Mala/Telemedicine/uclinux_source/uc2010_source/uclinux/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? > >>>> > >>>>> > >>>>> Please help. > >>>>> > >>>>> Thanks > >>>>> Mala > >>>>> -- > >>>>> Open WebMail Project (http://openwebmail.org) > > -- Open WebMail Project (http://openwebmail.org) -- 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
