[ALSA] soc - tlv320aic3x - add GPIO support
This patch adds support for AIC3x GPIO lines. They can be configured for many possible functions as well as be driven manually. I also introduced i2c read functionality since the GPIO state register has to be read from hardware every time and can not be served from cache. Signed-off-by: NDaniel Mack <daniel@caiaq.de> Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: NTakashi Iwai <tiwai@suse.de> Signed-off-by: NJaroslav Kysela <perex@perex.cz>
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