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-rw-r--r--include/sound/tlv.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/include/sound/tlv.h b/include/sound/tlv.h
index b826e1d..7905841 100644
--- a/include/sound/tlv.h
+++ b/include/sound/tlv.h
@@ -33,6 +33,7 @@
#define SNDRV_CTL_TLVT_CONTAINER 0 /* one level down - group of TLVs */
#define SNDRV_CTL_TLVT_DB_SCALE 1 /* dB scale */
+#define SNDRV_CTL_TLVT_DB_LINEAR 2 /* linear volume */
#define DECLARE_TLV_DB_SCALE(name, min, step, mute) \
unsigned int name[] = { \
@@ -40,4 +41,13 @@ unsigned int name[] = { \
(min), ((step) & 0xffff) | ((mute) ? 0x10000 : 0) \
}
+/* linear volume between min_dB and max_dB (.01dB unit) */
+#define DECLARE_TLV_DB_LINEAR(name, min_dB, max_dB) \
+unsigned int name[] = { \
+ SNDRV_CTL_TLVT_DB_LINEAR, 2 * sizeof(unsigned int), \
+ (min_dB), (max_dB) \
+}
+
+#define TLV_DB_GAIN_MUTE -9999999
+
#endif /* __SOUND_TLV_H */
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