snd_cs4231_in
status = snd_cs4231_in(chip, CS4231_IRQ_STATUS);
reg = snd_cs4231_in(chip, CS4231_TEST_INIT);
res = snd_cs4231_in(chip, CS4231_TEST_INIT);
id = snd_cs4231_in(chip, CS4231_MISC_INFO) & 0x0f;
vers = snd_cs4231_in(chip, CS4231_VERSION);