ALSA: tlv: add DECLARE_TLV_DB_RANGE()

commit bf1d1c9b6179faa3bc32cee882462bc8eebde25d upstream.

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>
Signed-off-by: Zefan Li <lizefan@huawei.com>

diff --git a/include/sound/tlv.h b/include/sound/tlv.h
index 137d1654e8d6d8b949e4ca91022594bd2dbbe567..49e7bd68c153f529ebaf36da7f50e57a44f56773 100644 (file)
--- a/include/sound/tlv.h
+++ b/include/sound/tlv.h
@@ -71,6 +71,10 @@
 
 /* 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)