1 files changed, 60 insertions, 0 deletions

diff --git a/include/sound/tlv.h b/include/sound/tlv.h
new file mode 100644
index 000000000000..d93a96b91875
--- /dev/null
+++ b/include/sound/tlv.h
@@ -0,0 +1,60 @@
+#ifndef __SOUND_TLV_H
+#define __SOUND_TLV_H
+
+/*
+ *  Advanced Linux Sound Architecture - ALSA - Driver
+ *  Copyright (c) 2006 by Jaroslav Kysela <perex@suse.cz>
+ *
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ *
+ */
+
+/*
+ * TLV structure is right behind the struct snd_ctl_tlv:
+ *   unsigned int type          - see SNDRV_CTL_TLVT_*
+ *   unsigned int length
+ *   .... data aligned to sizeof(unsigned int), use
+ *        block_length = (length + (sizeof(unsigned int) - 1)) &
+ *                       ~(sizeof(unsigned int) - 1)) ....
+ */
+
+#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 SNDRV_CTL_TLVT_DB_RANGE 3       /* dB range container */
+
+#define TLV_DB_SCALE_ITEM(min, step, mute)                      \
+        SNDRV_CTL_TLVT_DB_SCALE, 2 * sizeof(unsigned int),      \
+        (min), ((step) & 0xffff) | ((mute) ? 0x10000 : 0)
+#define DECLARE_TLV_DB_SCALE(name, min, step, mute) \
+        unsigned int name[] = { TLV_DB_SCALE_ITEM(min, step, mute) }
+
+/* linear volume between min_dB and max_dB (.01dB unit) */
+#define TLV_DB_LINEAR_ITEM(min_dB, max_dB)                  \
+        SNDRV_CTL_TLVT_DB_LINEAR, 2 * sizeof(unsigned int), \
+        (min_dB), (max_dB)
+#define DECLARE_TLV_DB_LINEAR(name, min_dB, max_dB)     \
+        unsigned int name[] = { TLV_DB_LINEAR_ITEM(min_dB, max_dB) }
+
+/* dB range container */
+/* Each item is: <min> <max> <TLV> */
+/* 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)
+
+#define TLV_DB_GAIN_MUTE        -9999999
+
+#endif /* __SOUND_TLV_H */