sound/soc/qcom/lpass-cdc-dma.c

File Facts

System

Linux kernel

Corpus path

sound/soc/qcom/lpass-cdc-dma.c

Extension

.c

Size

8465 bytes

Lines

304

Domain

Driver Families

Bucket

sound/soc

Inferred role

Driver Families: exported/initcall integration point

Status

integration 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.
• Exports symbols or registers init work; inspect boot/module ordering and who consumes the exported contract.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• dt-bindings/sound/qcom,lpass.h
• linux/clk.h
• linux/module.h
• linux/export.h
• sound/soc.h
• sound/soc-dai.h
• lpass-lpaif-reg.h
• lpass.h

Detected Declarations

• enum codec_dma_interfaces
• function __lpass_get_dmactl_handle
• function __lpass_get_codec_dma_intf_type
• function __lpass_platform_codec_intf_init
• function lpass_cdc_dma_daiops_startup
• function lpass_cdc_dma_daiops_shutdown
• function lpass_cdc_dma_daiops_hw_params
• function lpass_cdc_dma_daiops_trigger
• export asoc_qcom_lpass_cdc_dma_dai_ops

Annotated Snippet

if (ret) {
			dev_err(soc_runtime->dev,
				"error writing to dmactl codec_enable reg: %d\n", ret);
			return ret;
		}
		break;
	default:
		ret = -EINVAL;
		dev_err(soc_runtime->dev, "%s: invalid %d interface\n", __func__, cmd);
		break;
	}
	return ret;
}

const struct snd_soc_dai_ops asoc_qcom_lpass_cdc_dma_dai_ops = {
	.startup	= lpass_cdc_dma_daiops_startup,
	.shutdown	= lpass_cdc_dma_daiops_shutdown,
	.hw_params	= lpass_cdc_dma_daiops_hw_params,
	.trigger	= lpass_cdc_dma_daiops_trigger,
};
EXPORT_SYMBOL_GPL(asoc_qcom_lpass_cdc_dma_dai_ops);

MODULE_DESCRIPTION("QTi LPASS CDC DMA Driver");
MODULE_LICENSE("GPL");

Annotation

• Immediate include surface: `dt-bindings/sound/qcom,lpass.h`, `linux/clk.h`, `linux/module.h`, `linux/export.h`, `sound/soc.h`, `sound/soc-dai.h`, `lpass-lpaif-reg.h`, `lpass.h`.
• Detected declarations: `enum codec_dma_interfaces`, `function __lpass_get_dmactl_handle`, `function __lpass_get_codec_dma_intf_type`, `function __lpass_platform_codec_intf_init`, `function lpass_cdc_dma_daiops_startup`, `function lpass_cdc_dma_daiops_shutdown`, `function lpass_cdc_dma_daiops_hw_params`, `function lpass_cdc_dma_daiops_trigger`, `export asoc_qcom_lpass_cdc_dma_dai_ops`.
• Atlas domain: Driver Families / sound/soc.
• Implementation status: integration 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.