[linux-dvb] [PATCH] make the registers of the stv0297 visible for other applications (e.g. i2cdump)

Ralph Metzler rjkm at metzlerbros.de
Fri Jun 8 13:44:18 CEST 2007


Johannes Stezenbach writes:
 > What Jean writes only applies if you have a struct i2c_client
 > and i2c_driver to work with. the you can do lokcing in the
 > i2c_driver.
 > 
 > But we don't, IIRC because of problems with bus probing
 > done yb the i2c-core.
 > Not having an i2c_client is also the reason why we can't
 > use the i2c_smbus_* functions.
 >
 > Well, maybe we could fix this and then use i2c_client
 > and i2c_driver everywhere, but it still wouldn't solve
 > the i2c-dev problem, which I2C_M_STOP would in a very
 > simple and elegant way. I2C_M_STOP might also be useful
 > to talk to devices behind a repeater/gate or hub.


Another nice case is a card with 2 PLLs with identical addresses 
behind gates!
This cannot be handled with an i2c_client anyway.

Another problem with repeaters is, that some close by themselves after
a STOP. So, another message getting in-between completely messes
up the whole transfer. 


Ralph



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