Gerd Knorr wrote:

>This is the last of three patches for i2c.  It introduces a new field
>to i2c_adapter which classifies the kind of hardware a i2c adapter
>belongs to (analog tv card / dvb card / smbus / gfx card ...).
>

I've attached a patch that adds classes for analog and digital cameras 
(webcams, etc...). I plan to submit one such driver in the next few days.

The patch also fixes a typo ("DIGINAL").

>i2c chip
>drivers can use this infomation to decide whenever they want to look for
>hardware on that adapter or not.  It doesn't make sense to probe for a
>tv tuner on a smbus for example ...
>

Actually it does in some cases. I know of two devices that have analog 
tuners on an smbus-like interface (OV511 USB TV and W9967CF USB TV). The 
tuner can be controlled using a pair of i2c_smbus_write_byte_data() 
calls. This works because, AFAIK, all four-byte tuners can differentiate 
between bytes 0-1 and 2-3 due to their bit patterns.

Would a patch that adds smbus algorithm support to tuner.c be 
acceptable? It will only add about twelve lines, and will still use 
i2c_master_send() when possible.

-- 
Mark McClelland
mark@alpha.dyndns.org