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-I2C device driver binding control from user-space
-Up to kernel 2.6.32, many i2c drivers used helper macros provided by
-<linux/i2c.h> which created standard module parameters to let the user
-control how the driver would probe i2c buses and attach to devices. These
-parameters were known as "probe" (to let the driver probe for an extra
-address), "force" (to forcibly attach the driver to a given device) and
-"ignore" (to prevent a driver from probing a given address).
-With the conversion of the i2c subsystem to the standard device driver
-binding model, it became clear that these per-module parameters were no
-longer needed, and that a centralized implementation was possible. The new,
-sysfs-based interface is described in the documentation file
-"instantiating-devices", section "Method 4: Instantiate from user-space".
-Below is a mapping from the old module parameters to the new interface.
-Attaching a driver to an I2C device
-Old method (module parameters):
-# modprobe <driver> probe=1,0x2d
-# modprobe <driver> force=1,0x2d
-# modprobe <driver> force_<device>=1,0x2d
-New method (sysfs interface):
-# echo <device> 0x2d > /sys/bus/i2c/devices/i2c-1/new_device
-Preventing a driver from attaching to an I2C device
-Old method (module parameters):
-# modprobe <driver> ignore=1,0x2f
-New method (sysfs interface):
-# echo dummy 0x2f > /sys/bus/i2c/devices/i2c-1/new_device
-# modprobe <driver>
-Of course, it is important to instantiate the "dummy" device before loading
-the driver. The dummy device will be handled by i2c-core itself, preventing
-other drivers from binding to it later on. If there is a real device at the
-problematic address, and you want another driver to bind to it, then simply
-pass the name of the device in question instead of "dummy".