ALSA: es1968: Add radio support for MediaForte M56VAP
Add support for TEA5757 tuner on MediaForte M56VAP sound+modem+radio card. The GPIO connection type is automatically detected (like snd-fm801 driver). Also add a safety subsystem vendor check to skip radio detection if vendor differs from ESS (so we don't touch GPIOs on laptops). Tested with SF64-PCE2 and M56VAP cards. Signed-off-by: NOndrej Zary <linux@rainbow-software.org> Signed-off-by: NTakashi Iwai <tiwai@suse.de>
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