On Wed, Sep 14, 2011 at 04:03:58AM +0300, Antti Palosaari wrote: > On 09/09/2011 02:46 PM, Daniel Glöckner wrote: > >On Thu, Sep 08, 2011 at 07:34:32PM +0300, Antti Palosaari wrote: > >>I am working with AF9015 I2C-adapter lock. I need lock I2C-bus since > >>there is two tuners having same I2C address on same bus, demod I2C > >>gate is used to select correct tuner. > > > >Would it be possible to use the i2c-mux framework to handle this? > >Each tuner will then have its own i2c bus. > > Interesting idea, but it didn't worked. It deadlocks. I think it > locks since I2C-mux is controlled by I2C "switch" in same I2C bus, > not GPIO or some other HW. Take a look at drivers/i2c/muxes/pca954x.c. You need to use parent->algo->master_xfer/smbus_xfer directly as the lock that protects you from having both gates open is the lock of the root i2c bus. Daniel -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
