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* Poulsbo I2C - /dev/i2c not seen when loading i2c-dev
@ 2011-03-31 22:07 simon-wM4F9T/ekXmXDw4h08c5KA
       [not found] ` <fb407773c6a76f3ffef06ff357df2118.squirrel-N82HvsEaY4mscnXkh+DeetBPR1lH4CV8@public.gmane.org>
  0 siblings, 1 reply; 6+ messages in thread
From: simon-wM4F9T/ekXmXDw4h08c5KA @ 2011-03-31 22:07 UTC (permalink / raw)
  To: linux-i2c-u79uwXL29TY76Z2rM5mHXA

Hi all,
I'm hoping that someone here can help. I am trying to get userland access
to the I2C bus(es) on an embedded system, however recent kernels (ie.
2.6.38) are not 'loading' any buses when I 'modprobe i2c-dev'.

Going back to “2.6.32” I am able to see 1 bus, and 'i2cdetect 0' shows a
single device sitting at address 0x69 (which I believe to EEPROM on the
wifi card... not confirmed).


The board is built around the Poulsbo and therefore using the 'i2c-isch'
driver.

Reviewing the schematic I see that there are several buses, each going to
individual components:
IT8516 U5/110+111 -> LTC1760 U6/18+22 [battery charger – 0x1A/0x12] IT8516
U5/115+116 -> W83L771 U60/8+7 [thermal sensor – 0x18??]
IT8516 U5/117+118 -> LSM303DLH U64/19+20 [accel/compass – 0x19]
POULSBO U2/G37+H38 -> PCI Express Socket

I am a little dismayed by the comment in 'i2c-isch.c' which suggest it can
handle only one i2c bus at any time.
--
/*
   Supports:
	Intel SCH chipsets (AF82US15W, AF82US15L, AF82UL11L)
   Note: we assume there can only be one device, with one SMBus interface.
*/
--

This seems to correlate to these comments:
http://www.linuxforums.org/forum/programming-scripting/175147-smbus-intel-sch-us15w.html

Can anyone confirm whether this is actually the case, and whether it is
possible to configure it to use a different controller address. One would
expect this to be a module option I guess, however it doesn't seem to take
any.

Many thanks in advance,
Simon.

^ permalink raw reply	[flat|nested] 6+ messages in thread

end of thread, other threads:[~2011-04-08 20:11 UTC | newest]

Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
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2011-03-31 22:07 Poulsbo I2C - /dev/i2c not seen when loading i2c-dev simon-wM4F9T/ekXmXDw4h08c5KA
     [not found] ` <fb407773c6a76f3ffef06ff357df2118.squirrel-N82HvsEaY4mscnXkh+DeetBPR1lH4CV8@public.gmane.org>
2011-04-01 10:10   ` Jean Delvare
     [not found]     ` <20110401121027.49ce012b-R0o5gVi9kd7kN2dkZ6Wm7A@public.gmane.org>
2011-04-05 17:05       ` simon-wM4F9T/ekXmXDw4h08c5KA
     [not found]         ` <b9ff3e86cbf2aa2c34f614adf80e7ffb.squirrel-N82HvsEaY4mscnXkh+DeetBPR1lH4CV8@public.gmane.org>
2011-04-05 20:34           ` simon-wM4F9T/ekXmXDw4h08c5KA
     [not found]             ` <22a6003c213a91452d2a7312e4e5ad32.squirrel-N82HvsEaY4mscnXkh+DeetBPR1lH4CV8@public.gmane.org>
2011-04-06 17:20               ` Jean Delvare
     [not found]                 ` <20110406192059.369c3143-R0o5gVi9kd7kN2dkZ6Wm7A@public.gmane.org>
2011-04-08 20:11                   ` simon-wM4F9T/ekXmXDw4h08c5KA

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