sound/soc/sof/sof-acpi-dev.c

Source file repositories/reference/linux-study-clean/sound/soc/sof/sof-acpi-dev.c

File Facts

System
Linux kernel
Corpus path
sound/soc/sof/sof-acpi-dev.c
Extension
.c
Size
2962 bytes
Lines
103
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.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
//
// This file is provided under a dual BSD/GPLv2 license.  When using or
// redistributing this file, you may do so under either license.
//
// Copyright(c) 2018 Intel Corporation
//
// Author: Liam Girdwood <liam.r.girdwood@linux.intel.com>
//

#include <linux/acpi.h>
#include <linux/firmware.h>
#include <linux/module.h>
#include <linux/pm_runtime.h>
#include <sound/soc-acpi.h>
#include <sound/soc-acpi-intel-match.h>
#include <sound/sof.h>
#include "../intel/common/soc-intel-quirks.h"
#include "ops.h"
#include "sof-acpi-dev.h"

/* platform specific devices */
#include "intel/shim.h"

static char *fw_path;
module_param(fw_path, charp, 0444);
MODULE_PARM_DESC(fw_path, "deprecated - moved to snd-sof module.");

static char *tplg_path;
module_param(tplg_path, charp, 0444);
MODULE_PARM_DESC(tplg_path, "deprecated - moved to snd-sof module.");

static int sof_acpi_debug;
module_param_named(sof_acpi_debug, sof_acpi_debug, int, 0444);
MODULE_PARM_DESC(sof_acpi_debug, "SOF ACPI debug options (0x0 all off)");

#define SOF_ACPI_DISABLE_PM_RUNTIME BIT(0)

EXPORT_NS_DEV_PM_OPS(sof_acpi_pm, SND_SOC_SOF_ACPI_DEV) = {
	SYSTEM_SLEEP_PM_OPS(snd_sof_suspend, snd_sof_resume)
	RUNTIME_PM_OPS(snd_sof_runtime_suspend, snd_sof_runtime_resume,
		       snd_sof_runtime_idle)
};

static void sof_acpi_probe_complete(struct device *dev)
{
	dev_dbg(dev, "Completing SOF ACPI probe");

	if (sof_acpi_debug & SOF_ACPI_DISABLE_PM_RUNTIME)
		return;

	/* allow runtime_pm */
	pm_runtime_set_autosuspend_delay(dev, SND_SOF_SUSPEND_DELAY_MS);
	pm_runtime_use_autosuspend(dev);
	pm_runtime_enable(dev);
}

int sof_acpi_probe(struct platform_device *pdev, const struct sof_dev_desc *desc)
{
	struct device *dev = &pdev->dev;
	struct snd_sof_pdata *sof_pdata;

	dev_dbg(dev, "ACPI DSP detected");

	sof_pdata = devm_kzalloc(dev, sizeof(*sof_pdata), GFP_KERNEL);
	if (!sof_pdata)
		return -ENOMEM;

	if (!desc->ops) {
		dev_err(dev, "error: no matching ACPI descriptor ops\n");
		return -ENODEV;
	}

	sof_pdata->desc = desc;
	sof_pdata->dev = &pdev->dev;

	sof_pdata->ipc_file_profile_base.ipc_type = desc->ipc_default;
	sof_pdata->ipc_file_profile_base.fw_path = fw_path;
	sof_pdata->ipc_file_profile_base.tplg_path = tplg_path;

	/* set callback to be called on successful device probe to enable runtime_pm */
	sof_pdata->sof_probe_complete = sof_acpi_probe_complete;

	/* call sof helper for DSP hardware probe */
	return snd_sof_device_probe(dev, sof_pdata);
}
EXPORT_SYMBOL_NS(sof_acpi_probe, "SND_SOC_SOF_ACPI_DEV");

void sof_acpi_remove(struct platform_device *pdev)
{

Annotation

Implementation Notes