|The I2C protocol knows about two kinds of device addresses: normal 7 bit
|addresses, and an extended set of 10 bit addresses. The sets of addresses
|do not intersect: the 7 bit address 0x10 is not the same as the 10 bit
|address 0x10 (though a single device could respond to both of them).
|I2C messages to and from 10-bit address devices have a different format.
|See the I2C specification for the details.
|The current 10 bit address support is minimal. It should work, however
|you can expect some problems along the way:
|* Not all bus drivers support 10-bit addresses. Some don't because the
| hardware doesn't support them (SMBus doesn't require 10-bit address
| support for example), some don't because nobody bothered adding the
| code (or it's there but not working properly.) Software implementation
| (i2c-algo-bit) is known to work.
|* Some optional features do not support 10-bit addresses. This is the
| case of automatic detection and instantiation of devices by their,
| drivers, for example.
|* Many user-space packages (for example i2c-tools) lack support for
| 10-bit addresses.
|Note that 10-bit address devices are still pretty rare, so the limitations
|listed above could stay for a long time, maybe even forever if nobody
|needs them to be fixed.