sound/hda/core/ext/bus.c

Source file repositories/reference/linux-study-clean/sound/hda/core/ext/bus.c

File Facts

System
Linux kernel
Corpus path
sound/hda/core/ext/bus.c
Extension
.c
Size
3634 bytes
Lines
143
Domain
Driver Families
Bucket
sound/hda
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
/*
 *  hdac-ext-bus.c - HD-audio extended core bus functions.
 *
 *  Copyright (C) 2014-2015 Intel Corp
 *  Author: Jeeja KP <jeeja.kp@intel.com>
 *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <sound/hdaudio_ext.h>

MODULE_DESCRIPTION("HDA extended core");
MODULE_LICENSE("GPL v2");

/**
 * snd_hdac_ext_bus_init - initialize a HD-audio extended bus
 * @bus: the pointer to HDAC bus object
 * @dev: device pointer
 * @ops: bus verb operators
 * @ext_ops: operators used for ASoC HDA codec drivers
 *
 * Returns 0 if successful, or a negative error code.
 */
int snd_hdac_ext_bus_init(struct hdac_bus *bus, struct device *dev,
			const struct hdac_bus_ops *ops,
			const struct hdac_ext_bus_ops *ext_ops)
{
	int ret;

	ret = snd_hdac_bus_init(bus, dev, ops);
	if (ret < 0)
		return ret;

	bus->ext_ops = ext_ops;
	/* FIXME:
	 * Currently only one bus is supported, if there is device with more
	 * buses, bus->idx should be greater than 0, but there needs to be a
	 * reliable way to always assign same number.
	 */
	bus->idx = 0;
	bus->cmd_dma_state = true;

	return 0;
}
EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_init);

/**
 * snd_hdac_ext_bus_exit - clean up a HD-audio extended bus
 * @bus: the pointer to HDAC bus object
 */
void snd_hdac_ext_bus_exit(struct hdac_bus *bus)
{
	snd_hdac_bus_exit(bus);
	WARN_ON(!list_empty(&bus->hlink_list));
}
EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_exit);

/**
 * snd_hdac_ext_bus_device_remove - remove HD-audio extended codec base devices
 *
 * @bus: the pointer to HDAC bus object
 */
void snd_hdac_ext_bus_device_remove(struct hdac_bus *bus)
{
	struct hdac_device *codec, *__codec;
	/*
	 * we need to remove all the codec devices objects created in the
	 * snd_hdac_ext_bus_device_init
	 */
	list_for_each_entry_safe(codec, __codec, &bus->codec_list, list) {
		snd_hdac_device_unregister(codec);
		put_device(&codec->dev);
	}
}
EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_device_remove);
#define dev_to_hdac(dev) (container_of((dev), \
			struct hdac_device, dev))

static inline struct hdac_driver *get_hdrv(struct device *dev)
{
	struct hdac_driver *hdrv = drv_to_hdac_driver(dev->driver);
	return hdrv;
}

static inline struct hdac_device *get_hdev(struct device *dev)

Annotation

Implementation Notes