sound/soc/mediatek/mt6797/mt6797-dai-hostless.c
Source file repositories/reference/linux-study-clean/sound/soc/mediatek/mt6797/mt6797-dai-hostless.c
File Facts
- System
- Linux kernel
- Corpus path
sound/soc/mediatek/mt6797/mt6797-dai-hostless.c- Extension
.c- Size
- 3423 bytes
- Lines
- 119
- Domain
- Driver Families
- Bucket
- sound/soc
- Inferred role
- Driver Families: implementation source
- Status
- source implementation candidate
Why This File Exists
Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.
- Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.
- Allocates kernel memory; connect allocation flags and lifetime to context constraints.
- Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.
Dependency Surface
mt6797-afe-common.h
Detected Declarations
function mtk_dai_hostless_startupfunction mt6797_dai_hostless_register
Annotated Snippet
// SPDX-License-Identifier: GPL-2.0
//
// MediaTek ALSA SoC Audio DAI Hostless Control
//
// Copyright (c) 2018 MediaTek Inc.
// Author: KaiChieh Chuang <kaichieh.chuang@mediatek.com>
#include "mt6797-afe-common.h"
/* dai component */
static const struct snd_soc_dapm_route mtk_dai_hostless_routes[] = {
/* Hostless ADDA Loopback */
{"ADDA_DL_CH1", "ADDA_UL_CH1", "Hostless LPBK DL"},
{"ADDA_DL_CH1", "ADDA_UL_CH2", "Hostless LPBK DL"},
{"ADDA_DL_CH2", "ADDA_UL_CH1", "Hostless LPBK DL"},
{"ADDA_DL_CH2", "ADDA_UL_CH2", "Hostless LPBK DL"},
{"Hostless LPBK UL", NULL, "ADDA Capture"},
/* Hostless Speech */
{"ADDA_DL_CH1", "PCM_1_CAP_CH1", "Hostless Speech DL"},
{"ADDA_DL_CH2", "PCM_1_CAP_CH1", "Hostless Speech DL"},
{"ADDA_DL_CH2", "PCM_1_CAP_CH2", "Hostless Speech DL"},
{"ADDA_DL_CH1", "PCM_2_CAP_CH1", "Hostless Speech DL"},
{"ADDA_DL_CH2", "PCM_2_CAP_CH1", "Hostless Speech DL"},
{"ADDA_DL_CH2", "PCM_2_CAP_CH2", "Hostless Speech DL"},
{"PCM_1_PB_CH1", "ADDA_UL_CH1", "Hostless Speech DL"},
{"PCM_1_PB_CH2", "ADDA_UL_CH2", "Hostless Speech DL"},
{"PCM_2_PB_CH1", "ADDA_UL_CH1", "Hostless Speech DL"},
{"PCM_2_PB_CH2", "ADDA_UL_CH2", "Hostless Speech DL"},
{"Hostless Speech UL", NULL, "PCM 1 Capture"},
{"Hostless Speech UL", NULL, "PCM 2 Capture"},
{"Hostless Speech UL", NULL, "ADDA Capture"},
};
/* dai ops */
static int mtk_dai_hostless_startup(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct mtk_base_afe *afe = snd_soc_dai_get_drvdata(dai);
return snd_soc_set_runtime_hwparams(substream, afe->mtk_afe_hardware);
}
static const struct snd_soc_dai_ops mtk_dai_hostless_ops = {
.startup = mtk_dai_hostless_startup,
};
/* dai driver */
#define MTK_HOSTLESS_RATES (SNDRV_PCM_RATE_8000_48000 |\
SNDRV_PCM_RATE_88200 |\
SNDRV_PCM_RATE_96000 |\
SNDRV_PCM_RATE_176400 |\
SNDRV_PCM_RATE_192000)
#define MTK_HOSTLESS_FORMATS (SNDRV_PCM_FMTBIT_S16_LE |\
SNDRV_PCM_FMTBIT_S24_LE |\
SNDRV_PCM_FMTBIT_S32_LE)
static struct snd_soc_dai_driver mtk_dai_hostless_driver[] = {
{
.name = "Hostless LPBK DAI",
.id = MT6797_DAI_HOSTLESS_LPBK,
.playback = {
.stream_name = "Hostless LPBK DL",
.channels_min = 1,
.channels_max = 2,
.rates = MTK_HOSTLESS_RATES,
.formats = MTK_HOSTLESS_FORMATS,
},
.capture = {
.stream_name = "Hostless LPBK UL",
.channels_min = 1,
.channels_max = 2,
.rates = MTK_HOSTLESS_RATES,
.formats = MTK_HOSTLESS_FORMATS,
},
.ops = &mtk_dai_hostless_ops,
},
{
.name = "Hostless Speech DAI",
.id = MT6797_DAI_HOSTLESS_SPEECH,
.playback = {
.stream_name = "Hostless Speech DL",
.channels_min = 1,
.channels_max = 2,
.rates = MTK_HOSTLESS_RATES,
.formats = MTK_HOSTLESS_FORMATS,
},
.capture = {
Annotation
- Immediate include surface: `mt6797-afe-common.h`.
- Detected declarations: `function mtk_dai_hostless_startup`, `function mt6797_dai_hostless_register`.
- Atlas domain: Driver Families / sound/soc.
- Implementation status: source implementation candidate.
Implementation Notes
- This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
- Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
- Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.