SSM2603 and L/R DAC Volume

I need to be able to set the gain between the left and right DAC units independently in this driver, but I see no way of doing it.  In the ssm260x_probe() function it sets RLHPBOTH and LRHPBOTH to 1.

/* set the update bits */

reg = snd_soc_read(codec, SSM2602_LINVOL);

snd_soc_write(codec, SSM2602_LINVOL, reg | LINVOL_LRIN_BOTH);

reg = snd_soc_read(codec, SSM2602_RINVOL);

snd_soc_write(codec, SSM2602_RINVOL, reg | RINVOL_RLIN_BOTH);

Do I need to create a new ALSA control to modify each one?  Could someone possibly give me a breakdown of what that entails?  I don't want to hard code it, but I don't want this to take a week either.

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