Prepare_recovery and unprepare_recovery are to configure the pad multiplexer since thats platform specific. You don't care about the adapter reference as you just need the scl_gpio and sda_gpio values to know what pins to reconfigure. In fact Atmel's pad mux functions look like this: at91_set_A_periph(unsigned pin, int use_pullup) at91_set_B_periph(unsigned pin, int use_pullup) at91_set_C_periph(unsigned pin, int use_pullup) ..... Here's the latest(or close) driver specific patch that slipped through the cracks it seems? http://www.spinics.net/lists/linux-i2c/msg11357.html Bus_recovery itself you have to call in the at91 driver on a controller timeout just like the patch does. if (ret == 0) { dev_err(dev->dev, "controller timed out\n"); - at91_init_twi_bus(dev); + if (i2c_recover_bus(dev->adapter->bus_recovery_info) < 0) + at91_init_twi_bus(dev); ret = -ETIMEDOUT; goto error; } the call stack looks something like this --at91_twi_xfer ----- i2c_recover_bus --------- i2c_generic_gpio_recovery -------------i2c_get_gpios_for_recovery (requests gpios) -------------i2c_generic_recovery ----------------prepare_recovery (configure padmux to put gpio on the pin) ----------------get_sda, get_scl (get gpio value, generic function by default is fine for atmel) ----------------set_scl (set scl value, generic function by default is fine for atmel) ----------------unrepare_recovery (configure padmux to put twi back on the pin) -------------i2c_put_gpios_for_recovery (frees gpios) Somewhere in at91_twi_probe before the adapter is registered you also have to setup the bus_recovery_info struct and set recover_bus to the i2c_generic_gpio_recovery function similar to the patch linked. -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
