Yes this does sound good. We have heard of this type of multiplexing before. As Greg said, if you have a 2.6-compatible patch it can go into the kernel; If you have a 2.4-compatible patch see doc/developers/new_drivers in the sensors package and send it to this mailing list. thanks mds Brian Kuschak wrote: > Hello, > > I work for an networking storage company, supporting > linux for our custom embedded hardware. My company > makes extensive use of the I2C bus in our products. > Some of these product are chassis/blade based and as a > result many times a given I2C bus is multiplexed into > several bus segments to prevent address conflicts when > many I2C devices exist with the same address. Some > muxes are I2C based, some based on GPIO lines or > CPLDs, etc. > > In my experience this is a common hardware solution, > but it is difficult to fit into the existing i2c > driver implementation. > > I wanted to design a nice architecture to handle these > bus multiplexors in the most transparent and simple > way possible. My solution was to create a new i2c > adapter driver (i2c-virtual.c) which registers a new > i2c adapter/bus for each multiplexed bus segment. > This virtual adapter then makes calls to the real i2c > adapter to select the mux, perform the transfer, and > deselect again. Locking of the buses is handled. The > code also prevents "aliasing" of the same I2C device > onto multiple virtual I2C buses, putting all > non-multiplexed devices on the real bus, and only > multiplexed devices on the virtual busses. > > The result is that all the existing i2c client drivers > and sensor drivers work with this multiplexed hardware > without any changes, just by scanning the additional > buses. > > If anyone from this your group is interested in > reviewing or integrating this code into the official > sources, please let me know and I'll send a patch. > > BTW, do you have a mailing list? I couldn't find one. > > Best regards, > > Brian Kuschak > Brocade Communications Sys. > > > __________________________________ > Do you Yahoo!? > Yahoo! SiteBuilder - Free, easy-to-use web site design software > http://sitebuilder.yahoo.com >
