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In commitbf1d1c9b61("ALSA: tlv: add DECLARE_TLV_DB_RANGE()"), the new macro was added so that "dB range information can be specified without having to count the items manually for TLV_DB_RANGE_HEAD()". In short, TLV_DB_RANGE_HEAD macro was obsoleted. In commit46e860f768("ALSA: rename TLV-related macros so that they're friendly to user applications"), TLV-related macros are exposed for applications in user land to get content of data structured by Type/Length/Value shape. The commit managed to expose TLV-related macros as many as possible, while obsoleted TLV_DB_RANGE_HEAD() was included to the list of exposed macros. This situation brings some confusions to application developers because they might think all exposed macros have their own purpose and useful for applications. For the reason, this commit moves TLV_DB_RANGE_HEAD macro from UAPI header to a header for kernel land, again. The above commit is done within the same development period for kernel 4.9, thus not published yet. This commit might certainly brings no confusions to user land. Reference: commitbf1d1c9b61("ALSA: tlv: add DECLARE_TLV_DB_RANGE()") Reference: commit46e860f768("ALSA: rename TLV-related macros so that they're friendly to user applications") Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Takashi Iwai <tiwai@suse.de>
101 lines
3.9 KiB
C
101 lines
3.9 KiB
C
/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef __UAPI_SOUND_TLV_H
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#define __UAPI_SOUND_TLV_H
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#define SNDRV_CTL_TLVT_CONTAINER 0 /* one level down - group of TLVs */
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#define SNDRV_CTL_TLVT_DB_SCALE 1 /* dB scale */
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#define SNDRV_CTL_TLVT_DB_LINEAR 2 /* linear volume */
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#define SNDRV_CTL_TLVT_DB_RANGE 3 /* dB range container */
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#define SNDRV_CTL_TLVT_DB_MINMAX 4 /* dB scale with min/max */
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#define SNDRV_CTL_TLVT_DB_MINMAX_MUTE 5 /* dB scale with min/max with mute */
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/*
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* channel-mapping TLV items
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* TLV length must match with num_channels
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*/
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#define SNDRV_CTL_TLVT_CHMAP_FIXED 0x101 /* fixed channel position */
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#define SNDRV_CTL_TLVT_CHMAP_VAR 0x102 /* channels freely swappable */
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#define SNDRV_CTL_TLVT_CHMAP_PAIRED 0x103 /* pair-wise swappable */
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/*
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* TLV structure is right behind the struct snd_ctl_tlv:
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* unsigned int type - see SNDRV_CTL_TLVT_*
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* unsigned int length
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* .... data aligned to sizeof(unsigned int), use
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* block_length = (length + (sizeof(unsigned int) - 1)) &
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* ~(sizeof(unsigned int) - 1)) ....
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*/
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#define SNDRV_CTL_TLVD_ITEM(type, ...) \
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(type), SNDRV_CTL_TLVD_LENGTH(__VA_ARGS__), __VA_ARGS__
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#define SNDRV_CTL_TLVD_LENGTH(...) \
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((unsigned int)sizeof((const unsigned int[]) { __VA_ARGS__ }))
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#define SNDRV_CTL_TLVD_CONTAINER_ITEM(...) \
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SNDRV_CTL_TLVD_ITEM(SNDRV_CTL_TLVT_CONTAINER, __VA_ARGS__)
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#define SNDRV_CTL_TLVD_DECLARE_CONTAINER(name, ...) \
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unsigned int name[] = { \
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SNDRV_CTL_TLVD_CONTAINER_ITEM(__VA_ARGS__) \
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}
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#define SNDRV_CTL_TLVD_DB_SCALE_MASK 0xffff
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#define SNDRV_CTL_TLVD_DB_SCALE_MUTE 0x10000
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#define SNDRV_CTL_TLVD_DB_SCALE_ITEM(min, step, mute) \
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SNDRV_CTL_TLVD_ITEM(SNDRV_CTL_TLVT_DB_SCALE, \
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(min), \
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((step) & SNDRV_CTL_TLVD_DB_SCALE_MASK) | \
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((mute) ? SNDRV_CTL_TLVD_DB_SCALE_MUTE : 0))
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#define SNDRV_CTL_TLVD_DECLARE_DB_SCALE(name, min, step, mute) \
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unsigned int name[] = { \
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SNDRV_CTL_TLVD_DB_SCALE_ITEM(min, step, mute) \
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}
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/* dB scale specified with min/max values instead of step */
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#define SNDRV_CTL_TLVD_DB_MINMAX_ITEM(min_dB, max_dB) \
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SNDRV_CTL_TLVD_ITEM(SNDRV_CTL_TLVT_DB_MINMAX, (min_dB), (max_dB))
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#define SNDRV_CTL_TLVD_DB_MINMAX_MUTE_ITEM(min_dB, max_dB) \
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SNDRV_CTL_TLVD_ITEM(SNDRV_CTL_TLVT_DB_MINMAX_MUTE, (min_dB), (max_dB))
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#define SNDRV_CTL_TLVD_DECLARE_DB_MINMAX(name, min_dB, max_dB) \
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unsigned int name[] = { \
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SNDRV_CTL_TLVD_DB_MINMAX_ITEM(min_dB, max_dB) \
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}
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#define SNDRV_CTL_TLVD_DECLARE_DB_MINMAX_MUTE(name, min_dB, max_dB) \
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unsigned int name[] = { \
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SNDRV_CTL_TLVD_DB_MINMAX_MUTE_ITEM(min_dB, max_dB) \
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}
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/* linear volume between min_dB and max_dB (.01dB unit) */
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#define SNDRV_CTL_TLVD_DB_LINEAR_ITEM(min_dB, max_dB) \
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SNDRV_CTL_TLVD_ITEM(SNDRV_CTL_TLVT_DB_LINEAR, (min_dB), (max_dB))
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#define SNDRV_CTL_TLVD_DECLARE_DB_LINEAR(name, min_dB, max_dB) \
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unsigned int name[] = { \
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SNDRV_CTL_TLVD_DB_LINEAR_ITEM(min_dB, max_dB) \
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}
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/* dB range container:
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* Items in dB range container must be ordered by their values and by their
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* dB values. This implies that larger values must correspond with larger
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* dB values (which is also required for all other mixer controls).
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*/
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/* Each item is: <min> <max> <TLV> */
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#define SNDRV_CTL_TLVD_DB_RANGE_ITEM(...) \
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SNDRV_CTL_TLVD_ITEM(SNDRV_CTL_TLVT_DB_RANGE, __VA_ARGS__)
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#define SNDRV_CTL_TLVD_DECLARE_DB_RANGE(name, ...) \
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unsigned int name[] = { \
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SNDRV_CTL_TLVD_DB_RANGE_ITEM(__VA_ARGS__) \
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}
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#define SNDRV_CTL_TLVD_DB_GAIN_MUTE -9999999
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#endif
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