i2c bus classes in 2.6

Kyösti Mälkki kyosti.malkki at welho.com
Sat Jan 3 14:00:34 CET 2004


On Tue, 30 Dec 2003, Jean Delvare wrote:
> I think I remember that Kyösti was quite interested in classes because
> it would let us ignore non-SMBus adapters in sensors. Not sure how
> great it is however, since actually we should look for specific chips,
> not specific adapters.

I was referring to a class_device in the driver-model. Registering a
sensor as a class device would at minimum create symbolic links to
sensor chips in a common directory under sysfs, no matter which hw bus
implementation they have.

The class test with adapter and driver is something different.
I don't know where this part of the code came from but the purpose
seems clear, to prevent, eg. tuner driver unintentionally probing on an
SMBus clock generator.

A related issue is i2c_clients_command. For every client on an adapter,
it calls client->driver->command(client, cmd, data) if specified.  This
blindly assumes a global enumeration of cmd, which is not true.

-- 
  Kyösti Mälkki  <kyosti.malkki at welho.com>



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