Hi Rudolf, Thanks for your reply. I've managed to access the ICH6 SMBus controller with the i2c-i801 and i2c-dev modules. But I got some other problems as follows: a) When I issued a command with size=I2C_SMBUS_QUICK first time, I got successful return (>0) of function call to ioctl(). Then I tried to issue a command with size=I2C_SMBUS_BYTE or I2C_SMBUS_BYTE_DATA, I got an unsuccessful return (<=0) of function call to ioctl(). I saw one or more of the following error messages: "Error: no response!" "SMBus timeout" "Bus collision! SMBus may be locked until next hard reset. (sorry!)", or "SMBus busy (01). Resetting..." "Failed! (01)" b) After I saw the above error messages, I was unable to access the registers of the SMBus controller. Any ideas about the causes for these error messages and how I can prevent these errors? Thanks. MK -----Original Message----- From: Rudolf Marek [mailto:r.marek at sh.cvut.cz] Sent: Friday, November 04, 2005 3:48 PM To: Gu, Mingkun Cc: lm-sensors at lm-sensors.org Subject: Re: RE: Helps: how to use i801--SMBus functions viai2c-dev module in Linux? Gu, Mingkun wrote: > Could anyone advise how I can make use i2c-i801 and/or i2c-dev to access > ICH6 SMBus controller on a PC motherboard? I have Linux 2.6.10 and > loaded i2c-core, i2c-i801and i2c-dev modules. lsmod command gave me the > following info: > > It seems that i2c-i801 is not used by other modules. This is OK. If I understand it correctly all you want is to create the _userspace_ program that will send commands to the specific device on the bus. If so please have a look to linux-2.6.x/Documentation/i2c/dev-interface Further example could be found in lm-sensors package. i2cdump.c i2cset.c etc... I hope this helps, Regards Rudolf ----------------------------------------- This email may contain confidential and privileged material for the sole use of the intended recipient(s). Any review, use, retention, distribution or disclosure by others is strictly prohibited. If you are not the intended recipient (or authorized to receive for the recipient), please contact the sender by reply email and delete all copies of this message. Also, email is susceptible to data corruption, interception, tampering, unauthorized amendment and viruses. We only send and receive emails on the basis that we are not liable for any such corruption, interception, tampering, amendment or viruses or any consequence thereof.
