• Thomas Petazzoni's avatar
    ASoC: cs42l51: fix driver to properly autoload with automatic module loading · e51df4f8
    Thomas Petazzoni authored
    In commit 2cb1e025 ("ASoC: cs42l51: re-hook of_match_table
    pointer"), 9 years ago, some random guy fixed the cs42l51 after it was
    split into a core part and an I2C part to properly match based on a
    Device Tree compatible string.
    
    However, the fix in this commit is wrong: the MODULE_DEVICE_TABLE(of,
    ....) is in the core part of the driver, not the I2C part. Therefore,
    automatic module loading based on module.alias, based on matching with
    the DT compatible string, loads the core part of the driver, but not
    the I2C part. And threfore, the i2c_driver is not registered, and the
    codec is not known to the system, nor matched with a DT node with the
    corresponding compatible string.
    
    In order to fix that, we move the MODULE_DEVICE_TABLE(of, ...) into
    the I2C part of the driver. The cs42l51_of_match[] array is also moved
    as well, as it is not possible to have this definition in one file,
    and the MODULE_DEVICE_TABLE(of, ...) invocation in another file, due
    to how MODULE_DEVICE_TABLE works.
    
    Thanks to this commit, the I2C part of the driver now properly
    autoloads, and thanks to its dependency on the core part, the core
    part gets autoloaded as well, resulting in a functional sound card
    without having to manually load kernel modules.
    
    Fixes: 2cb1e025
    
     ("ASoC: cs42l51: re-hook of_match_table pointer")
    Cc: stable@vger.kernel.org
    Signed-off-by: default avatarThomas Petazzoni <thomas.petazzoni@bootlin.com>
    Link: https://lore.kernel.org/r/20230713112112.778576-1-thomas.petazzoni@bootlin.com
    
    Signed-off-by: default avatarMark Brown <broonie@kernel.org>
    e51df4f8
cs42l51.c 22.7 KB