----- Original Message ----- > On Wed, 6 Jul 2011 09:40:15 -0500 (CDT), Tim Nelson wrote: > > ----- Original Message ----- > > > Hi Tim, > > > > > > On Tue, 5 Jul 2011 12:06:13 -0500 (CDT), Tim Nelson wrote: > > > > I've done that: > > > > > > > > root@aaa:~# lsmod | grep i2c > > > > i2c_dev 3382 0 > > > > i2c_core 12703 1 i2c_dev > > > > > > > > But, nothing of interest in dmesg other than: > > > > > > > > [108414.944722] i2c /dev entries driver > > > > > > > > and running i2cdetect still turns up nothing: > > > > > > > > root@aaa:~# i2cdetect -l > > > > > > > > Any thoughts? Does this specific Winbond chip require a device > > > > specific kernel module to operate such as those found in > > > > /lib/modules/2.6.32-5-486/kernel/drivers/i2c/busses ? > > > > > > As I understand it, the W83L604G is a GPIO expander on I2C/SMBus, > > > so > > > what it needs is a driver in drivers/gpio. We don't seem to have > > > support > > > for it yet, unless it is 100% compatible with another device we > > > already > > > support. > > > > > > On top of that, you need a driver for the I2C/SMBus controller on > > > your > > > mainboard, to which the W83L604G is connected. Without it, you > > > won't > > > even be able to talk to the W83L604G. You did not tell us anything > > > about your system so we can't tell you which driver that would be > > > - if > > > we have a driver at all. Does lspci say anything about SMBus? If > > > not, > > > what is your system based on? > > > > > > > Greetings Jean- > > > > The board is running an AMD Geode LX CPU with the CS5536 companion > > chip. Here is the output of lspci: > > > > root@aaa:~# lspci > > 00:01.0 Host bridge: Advanced Micro Devices [AMD] CS5536 [Geode > > companion] Host Bridge (rev 33) > > 00:01.1 VGA compatible controller: Advanced Micro Devices [AMD] > > Geode LX Video > > 00:01.2 Entertainment encryption device: Advanced Micro Devices > > [AMD] Geode LX AES Security Block > > 00:0e.0 Ethernet controller: VIA Technologies, Inc. VT6105M > > [Rhine-III] (rev 96) > > 00:0f.0 Ethernet controller: VIA Technologies, Inc. VT6105M > > [Rhine-III] (rev 96) > > 00:12.0 Communication controller: Tiger Jet Network Inc. Tiger3XX > > Modem/ISDN interface > > 00:13.0 ISA bridge: Advanced Micro Devices [AMD] CS5536 [Geode > > companion] ISA (rev 03) > > 00:13.2 IDE interface: Advanced Micro Devices [AMD] CS5536 [Geode > > companion] IDE (rev 01) > > 00:13.4 USB Controller: Advanced Micro Devices [AMD] CS5536 [Geode > > companion] OHC (rev 02) > > 00:13.5 USB Controller: Advanced Micro Devices [AMD] CS5536 [Geode > > companion] EHC (rev 02) > > > > There are no SMBus controllers listed. However, The datasheet[1] for > > the CS5536 notes there is an SMB controller within this chip. > > Details from the datasheet: > > > > "System Management Bus (SMB) Controller: > > — Compatible with Intel System Management Bus, > > Industry Standard Two-wire interface, and > > ACCESS.bus > > — Bus master and slave operation" > > Correct, and we have support for this device. Driver is named > scx200_acb. Load it and then "i2cdetect -l" should list the SMBus. > YES! The SMBus is now detected. I'll continue working with the i2c toolset further. Thank you for the pointer! --Tim -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
