Hi Ed, On Wed, 7 Jan 2009 07:22:12 -0800, Ed Swierk wrote: > On Wed, Jan 7, 2009 at 5:24 AM, Jean Delvare <khali@xxxxxxxxxxxx> wrote: > > Are you certain the nForce2 controllers can't do it? The i2c-nforce2 > > driver doesn't implement it, but this doesn't mean the hardware can't > > do it. I don't have any datasheet for these chips, but I know their > > SMBus implementation is very similar to those of the AMD 8111, and > > i2c-amd8111 has support for I2C block reads and writes. I think it > > would be worth giving it a try, by copying the i2c-amd8111 > > implementation into the i2c-nforce2 driver and seeing if it happens to > > just work. If it works, that would be more elegant than your proposed > > hack to the rtc-ds1307 driver. > > I checked the datasheet and also tried every possible SMBus command > value to try to discover any supported commands that the i2c-nforce2 > driver happens not to use, to no avail. The nVidia SMBus is pure > SMBus. Did you try 0x4a (as i2c-amd8111 is using)? So, you have the datasheet... Is this something you would be allowed to share with me? > I could change the ds1307 driver to check whether the controller > supports i2c block commands and fall back to emulation only if they > are not available. Would that address your concerns? Yes, that would. Same thing the eeprom or lm93 drivers are doing, to only name a few of them. Should be fairly easy. -- 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
