On Mon, Mar 08, 2010 at 08:50:08AM +0100, Jean Delvare wrote: > From: Jean Delvare <khali@xxxxxxxxxxxx> > Subject: at24: Fall back to byte or word reads if needed > > Increase the portability of the at24 driver by letting it read from > EEPROM chips connected to cheap SMBus controllers that support neither > raw I2C messages nor even I2C block reads. All SMBus controllers > should support either word reads or byte reads, so read support > becomes universal, much like with the legacy "eeprom" driver. > > Obviously, this only works with EEPROM chips up to AT24C16, that use > 8-bit offset addressing. 16-bit offset addressing is almost impossible > to support on SMBus controllers. > > I did not add universal support for writes, as I had no immediate need > for this, but it could be added later if needed (with the same > performance issue as byte and word reads have, of course.) It would be worth sorting out which i2c busses are exporting the correct functionality, I think for example the i2c-s3c2410.c driver is missing the I2C block functionality. -- Ben (ben@xxxxxxxxx, http://www.fluff.org/) 'a smiley only costs 4 bytes' -- 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
