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    Subject[PATCH 2.6.12-rc4 1/15] (dynamic sysfs callbacks) device attribute callbacks - take 2

    The following patches implement dynamic sysfs callbacks for
    device_attribute, and provide a possible standard sensor attribute
    macro for the majority of the i2c sensor chip/hwmon drivers. Finally a
    patch against adm1026 shows how the patch can be used to reduce the
    footprint and clean up an existing driver.

    The new form of dynamic sysfs callback simply passes a reference to
    the device_attribute struct, instead of a void *, along the lines of
    the suggestion by Russell King (see Embedding the device_attribute
    struct in a custom struct one can use a macro based on container_of to
    access the custom attribute specific data.

    Although functionally as capable as the void *, this solution I feel
    is better in that it rids of some error-prone casting, and the
    resulting code seems generally cleaner and easier to understand, there
    is also no need for the extra void * member in the base sysfs
    attribute. On the other hand a bit more work is required to implement
    this on a grand scale, and in many cases a new attribute struct might
    have to be defined for a driver, along with any convenience macros. My
    example patch implements a new attribute struct
    sensor_device_attribute that should be reusable by the majority of i2c
    chip drivers (as suggested by Greg).

    Signed-off-by: Yani Ioannou <>

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      Last update: 2005-05-17 12:43    [W:0.019 / U:7.872 seconds]
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