Hi Jean, Le 24/05/2013 14:20, Jean Delvare a écrit : > On Fri, 24 May 2013 11:52:54 +0200, Mylene Josserand wrote: >> - an audio codec tlv320aic3204 : There is a driver for this device but >> for some reasons, we did not use it. Did not find a "SMBus compliant" in >> its datasheet. > > The tlv320aic32x4 driver uses i2c_master_send, which is a shortcut to > i2c_transfer. However it seems to only send 2 bytes on the bus at once, > the same could be achieved with i2c_smbus_write_byte_data if needed. Okay, thanks to have looked at it ! > > For completeness: a device might use transactions which are compliant > with SMBus without being formally "SMBus-compliant", because SMBus has > more constraints than just transaction types (I kept things simple > originally to not confuse you.) This may explain why it isn't mentioned > in the datasheet. Or just because the manufacturer did not care because > they target fully I2C-capable systems anyway. > > What you have to look at is the transaction types. They are usually > described in the datasheet. Then compare with either the SMBus > specification or > http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/Documentation/i2c/smbus-protocol > and if they match then you can use the i2c_smbus_*() calls. I have checked the PIC18F24201 according to your advice and, of what I have seen, it can handle the SMBus protocol. Thank you for the explanation and trying to keep it simple for me :) -- Mylène JOSSERAND _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
