ALSA: usb-audio: UAC2: clean up parsing of bmaControls

Introduce two new static inline functions for a more readable parsing
of UAC2 bmaControls.

Signed-off-by: Daniel Mack <daniel@caiaq.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

2 files changed, 14 insertions, 4 deletions

diff --git a/include/linux/usb/audio-v2.h b/include/linux/usb/audio-v2.h
index 92f1d99f0f17..8f91be3599c6 100644
--- a/include/linux/usb/audio-v2.h
+++ b/include/linux/usb/audio-v2.h
@@ -18,6 +18,16 @@
 /* v1.0 and v2.0 of this standard have many things in common. For the rest
  * of the definitions, please refer to audio.h */
 
+static inline bool uac2_control_is_readable(u32 bmControls, u8 control)
+{
+        return (bmControls >> (control * 2)) & 0x1;
+}
+
+static inline bool uac2_control_is_writeable(u32 bmControls, u8 control)
+{
+        return (bmControls >> (control * 2)) & 0x2;
+}
+
 /* 4.7.2.1 Clock Source Descriptor */
 
 struct uac_clock_source_descriptor {
diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index 03ce971e0027..43d6417b811e 100644
--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -1188,9 +1188,9 @@ static int parse_audio_feature_unit(struct mixer_build *state, int unitid, void
 
                         for (j = 0; j < channels; j++) {
                                 unsigned int mask = snd_usb_combine_bytes(bmaControls + csize * (j+1), csize);
-                                if (mask & (1 << (i * 2))) {
+                                if (uac2_control_is_readable(mask, i)) {
                                         ch_bits |= (1 << j);
-                                        if (~mask & (1 << ((i * 2) + 1)))
+                                        if (!uac2_control_is_writeable(mask, i))
                                                 ch_read_only |= (1 << j);
                                 }
                         }
@@ -1198,9 +1198,9 @@ static int parse_audio_feature_unit(struct mixer_build *state, int unitid, void
                         /* FIXME: the whole unit is read-only if any of the channels is marked read-only */
                         if (ch_bits & 1) /* the first channel must be set (for ease of programming) */
                                 build_feature_ctl(state, _ftr, ch_bits, i, &iterm, unitid, !!ch_read_only);
-                        if (master_bits & (1 << i * 2))
+                        if (uac2_control_is_readable(master_bits, i))
                                 build_feature_ctl(state, _ftr, 0, i, &iterm, unitid,
-                                                  ~master_bits & (1 << ((i * 2) + 1)));
+                                                  !uac2_control_is_writeable(master_bits, i));
                 }
         }