sound/soc/codecs/jz4740.c
Source file repositories/reference/linux-study-clean/sound/soc/codecs/jz4740.c
File Facts
- System
- Linux kernel
- Corpus path
sound/soc/codecs/jz4740.c- Extension
.c- Size
- 10216 bytes
- Lines
- 358
- 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
linux/kernel.hlinux/module.hlinux/platform_device.hlinux/slab.hlinux/io.hlinux/regmap.hlinux/delay.hsound/core.hsound/pcm.hsound/pcm_params.hsound/initval.hsound/soc.hsound/tlv.h
Detected Declarations
struct jz4740_codecfunction jz4740_codec_hw_paramsfunction jz4740_codec_wakeupfunction jz4740_codec_set_bias_levelfunction jz4740_codec_dev_probefunction jz4740_codec_probe
Annotated Snippet
struct jz4740_codec {
struct regmap *regmap;
};
static const DECLARE_TLV_DB_RANGE(jz4740_mic_tlv,
0, 2, TLV_DB_SCALE_ITEM(0, 600, 0),
3, 3, TLV_DB_SCALE_ITEM(2000, 0, 0)
);
static const DECLARE_TLV_DB_SCALE(jz4740_out_tlv, 0, 200, 0);
static const DECLARE_TLV_DB_SCALE(jz4740_in_tlv, -3450, 150, 0);
static const struct snd_kcontrol_new jz4740_codec_controls[] = {
SOC_SINGLE_TLV("Master Playback Volume", JZ4740_REG_CODEC_2,
JZ4740_CODEC_2_HEADPHONE_VOLUME_OFFSET, 3, 0,
jz4740_out_tlv),
SOC_SINGLE_TLV("Master Capture Volume", JZ4740_REG_CODEC_2,
JZ4740_CODEC_2_INPUT_VOLUME_OFFSET, 31, 0,
jz4740_in_tlv),
SOC_SINGLE("Master Playback Switch", JZ4740_REG_CODEC_1,
JZ4740_CODEC_1_HEADPHONE_DISABLE_OFFSET, 1, 1),
SOC_SINGLE_TLV("Mic Capture Volume", JZ4740_REG_CODEC_2,
JZ4740_CODEC_2_MIC_BOOST_GAIN_OFFSET, 3, 0,
jz4740_mic_tlv),
};
static const struct snd_kcontrol_new jz4740_codec_output_controls[] = {
SOC_DAPM_SINGLE("Bypass Switch", JZ4740_REG_CODEC_1,
JZ4740_CODEC_1_SW1_ENABLE_OFFSET, 1, 0),
SOC_DAPM_SINGLE("DAC Switch", JZ4740_REG_CODEC_1,
JZ4740_CODEC_1_SW2_ENABLE_OFFSET, 1, 0),
};
static const struct snd_kcontrol_new jz4740_codec_input_controls[] = {
SOC_DAPM_SINGLE("Line Capture Switch", JZ4740_REG_CODEC_1,
JZ4740_CODEC_1_LINE_ENABLE_OFFSET, 1, 0),
SOC_DAPM_SINGLE("Mic Capture Switch", JZ4740_REG_CODEC_1,
JZ4740_CODEC_1_MIC_ENABLE_OFFSET, 1, 0),
};
static const struct snd_soc_dapm_widget jz4740_codec_dapm_widgets[] = {
SND_SOC_DAPM_ADC("ADC", "Capture", JZ4740_REG_CODEC_1,
JZ4740_CODEC_1_ADC_ENABLE_OFFSET, 0),
SND_SOC_DAPM_DAC("DAC", "Playback", JZ4740_REG_CODEC_1,
JZ4740_CODEC_1_DAC_ENABLE_OFFSET, 0),
SND_SOC_DAPM_MIXER("Output Mixer", JZ4740_REG_CODEC_1,
JZ4740_CODEC_1_HEADPHONE_POWERDOWN_OFFSET, 1,
jz4740_codec_output_controls,
ARRAY_SIZE(jz4740_codec_output_controls)),
SND_SOC_DAPM_MIXER_NAMED_CTL("Input Mixer", SND_SOC_NOPM, 0, 0,
jz4740_codec_input_controls,
ARRAY_SIZE(jz4740_codec_input_controls)),
SND_SOC_DAPM_MIXER("Line Input", SND_SOC_NOPM, 0, 0, NULL, 0),
SND_SOC_DAPM_OUTPUT("LOUT"),
SND_SOC_DAPM_OUTPUT("ROUT"),
SND_SOC_DAPM_INPUT("MIC"),
SND_SOC_DAPM_INPUT("LIN"),
SND_SOC_DAPM_INPUT("RIN"),
};
static const struct snd_soc_dapm_route jz4740_codec_dapm_routes[] = {
{"Line Input", NULL, "LIN"},
{"Line Input", NULL, "RIN"},
{"Input Mixer", "Line Capture Switch", "Line Input"},
{"Input Mixer", "Mic Capture Switch", "MIC"},
{"ADC", NULL, "Input Mixer"},
{"Output Mixer", "Bypass Switch", "Input Mixer"},
{"Output Mixer", "DAC Switch", "DAC"},
{"LOUT", NULL, "Output Mixer"},
{"ROUT", NULL, "Output Mixer"},
};
static int jz4740_codec_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
{
struct jz4740_codec *jz4740_codec = snd_soc_component_get_drvdata(dai->component);
uint32_t val;
switch (params_rate(params)) {
case 8000:
val = 0;
break;
Annotation
- Immediate include surface: `linux/kernel.h`, `linux/module.h`, `linux/platform_device.h`, `linux/slab.h`, `linux/io.h`, `linux/regmap.h`, `linux/delay.h`, `sound/core.h`.
- Detected declarations: `struct jz4740_codec`, `function jz4740_codec_hw_params`, `function jz4740_codec_wakeup`, `function jz4740_codec_set_bias_level`, `function jz4740_codec_dev_probe`, `function jz4740_codec_probe`.
- 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.