ALSA: tlv: add DECLARE_TLV_DB_RANGE()

Add a DECLARE_TLV_DB_RANGE() macro so that dB range information
can be specified without having to count the items manually for
TLV_DB_RANGE_HEAD().

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 4 insertions, 0 deletions

diff --git a/include/sound/tlv.h b/include/sound/tlv.h
index a9ff3db38296..a64d8fe3f855 100644
--- a/include/sound/tlv.h
+++ b/include/sound/tlv.h
@@ -76,6 +76,10 @@
 
 /* dB range container */
 /* Each item is: <min> <max> <TLV> */
+#define TLV_DB_RANGE_ITEM(...) \
+        TLV_ITEM(SNDRV_CTL_TLVT_DB_RANGE, __VA_ARGS__)
+#define DECLARE_TLV_DB_RANGE(name, ...) \
+        unsigned int name[] = { TLV_DB_RANGE_ITEM(__VA_ARGS__) }
 /* The below assumes that each item TLV is 4 words like DB_SCALE or LINEAR */
 #define TLV_DB_RANGE_HEAD(num)                  \
         SNDRV_CTL_TLVT_DB_RANGE, 6 * (num) * sizeof(unsigned int)