linux-kernel - [PATCH 3.4 103/107] ALSA: tlv: add DECLARE_TLV_DB

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Date:	Wed, 16 Mar 2016 16:06:37 +0800
From:	lizf@...nel.org
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Clemens Ladisch <clemens@...isch.de>,
	Takashi Iwai <tiwai@...e.de>, Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 103/107] ALSA: tlv: add DECLARE_TLV_DB_RANGE()

From: Clemens Ladisch <clemens@...isch.de>

3.4.111-rc1 review patch.  If anyone has any objections, please let me know.

------------------


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@...isch.de>
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Zefan Li <lizefan@...wei.com>
---
 include/sound/tlv.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/sound/tlv.h b/include/sound/tlv.h
index 137d165..49e7bd6 100644
--- 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)
-- 
1.9.1