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ALSA: usb-audio: Simplify parse_audio_unit() 

Minor code refactoring by combining the UAC version and the type in
the switch-case flow, so that we reduce the indentation and
redundancy.  One good bonus is that the duplicated definition of the
same type value (e.g. UAC2_EFFECT_UNIT) can be handled more cleanly.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2019-08-15 16:30:39 +02:00
parent 57f8770620
commit 68e9fde245
1 changed files with 39 additions and 56 deletions
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95
sound/usb/mixer.c
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@ -2782,62 +2782,45 @@ static int parse_audio_unit(struct mixer_build *state, int unitid)
return 0; /* skip invalid unit */
}
if (protocol == UAC_VERSION_1 || protocol == UAC_VERSION_2) {
switch (p1[2]) {
case UAC_INPUT_TERMINAL:
return parse_audio_input_terminal(state, unitid, p1);
case UAC_MIXER_UNIT:
return parse_audio_mixer_unit(state, unitid, p1);
case UAC2_CLOCK_SOURCE:
return parse_clock_source_unit(state, unitid, p1);
case UAC_SELECTOR_UNIT:
case UAC2_CLOCK_SELECTOR:
return parse_audio_selector_unit(state, unitid, p1);
case UAC_FEATURE_UNIT:
return parse_audio_feature_unit(state, unitid, p1);
case UAC1_PROCESSING_UNIT:
/* UAC2_EFFECT_UNIT has the same value */
if (protocol == UAC_VERSION_1)
return parse_audio_processing_unit(state, unitid, p1);
else
return 0; /* FIXME - effect units not implemented yet */
case UAC1_EXTENSION_UNIT:
/* UAC2_PROCESSING_UNIT_V2 has the same value */
if (protocol == UAC_VERSION_1)
return parse_audio_extension_unit(state, unitid, p1);
else /* UAC_VERSION_2 */
return parse_audio_processing_unit(state, unitid, p1);
case UAC2_EXTENSION_UNIT_V2:
return parse_audio_extension_unit(state, unitid, p1);
default:
usb_audio_err(state->chip,
"unit %u: unexpected type 0x%02x\n", unitid, p1[2]);
return -EINVAL;
}
} else { /* UAC_VERSION_3 */
switch (p1[2]) {
case UAC_INPUT_TERMINAL:
return parse_audio_input_terminal(state, unitid, p1);
case UAC3_MIXER_UNIT:
return parse_audio_mixer_unit(state, unitid, p1);
case UAC3_CLOCK_SOURCE:
return parse_clock_source_unit(state, unitid, p1);
case UAC3_SELECTOR_UNIT:
case UAC3_CLOCK_SELECTOR:
return parse_audio_selector_unit(state, unitid, p1);
case UAC3_FEATURE_UNIT:
return parse_audio_feature_unit(state, unitid, p1);
case UAC3_EFFECT_UNIT:
return 0; /* FIXME - effect units not implemented yet */
case UAC3_PROCESSING_UNIT:
return parse_audio_processing_unit(state, unitid, p1);
case UAC3_EXTENSION_UNIT:
return parse_audio_extension_unit(state, unitid, p1);
default:
usb_audio_err(state->chip,
"unit %u: unexpected type 0x%02x\n", unitid, p1[2]);
return -EINVAL;
}
#define PTYPE(a, b) ((a) << 8 | (b))
switch (PTYPE(protocol, p1[2])) {
case PTYPE(UAC_VERSION_1, UAC_INPUT_TERMINAL):
case PTYPE(UAC_VERSION_2, UAC_INPUT_TERMINAL):
case PTYPE(UAC_VERSION_3, UAC_INPUT_TERMINAL):
return parse_audio_input_terminal(state, unitid, p1);
case PTYPE(UAC_VERSION_1, UAC_MIXER_UNIT):
case PTYPE(UAC_VERSION_2, UAC_MIXER_UNIT):
case PTYPE(UAC_VERSION_3, UAC3_MIXER_UNIT):
return parse_audio_mixer_unit(state, unitid, p1);
case PTYPE(UAC_VERSION_2, UAC2_CLOCK_SOURCE):
case PTYPE(UAC_VERSION_3, UAC3_CLOCK_SOURCE):
return parse_clock_source_unit(state, unitid, p1);
case PTYPE(UAC_VERSION_1, UAC_SELECTOR_UNIT):
case PTYPE(UAC_VERSION_2, UAC_SELECTOR_UNIT):
case PTYPE(UAC_VERSION_3, UAC3_SELECTOR_UNIT):
case PTYPE(UAC_VERSION_2, UAC2_CLOCK_SELECTOR):
case PTYPE(UAC_VERSION_3, UAC3_CLOCK_SELECTOR):
return parse_audio_selector_unit(state, unitid, p1);
case PTYPE(UAC_VERSION_1, UAC_FEATURE_UNIT):
case PTYPE(UAC_VERSION_2, UAC_FEATURE_UNIT):
case PTYPE(UAC_VERSION_3, UAC3_FEATURE_UNIT):
return parse_audio_feature_unit(state, unitid, p1);
case PTYPE(UAC_VERSION_1, UAC1_PROCESSING_UNIT):
case PTYPE(UAC_VERSION_2, UAC2_PROCESSING_UNIT_V2):
case PTYPE(UAC_VERSION_3, UAC3_PROCESSING_UNIT):
return parse_audio_processing_unit(state, unitid, p1);
case PTYPE(UAC_VERSION_1, UAC1_EXTENSION_UNIT):
case PTYPE(UAC_VERSION_2, UAC2_EXTENSION_UNIT_V2):
case PTYPE(UAC_VERSION_3, UAC3_EXTENSION_UNIT):
return parse_audio_extension_unit(state, unitid, p1);
case PTYPE(UAC_VERSION_2, UAC2_EFFECT_UNIT):
case PTYPE(UAC_VERSION_3, UAC3_EFFECT_UNIT):
return 0; /* FIXME - effect units not implemented yet */
default:
usb_audio_err(state->chip,
"unit %u: unexpected type 0x%02x\n",
unitid, p1[2]);
return -EINVAL;
}
}