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. -- Jean Delvare -- 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
