https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: c9e6606c7fe92b50a02ce51dda82586ebdf99b48 authored by Linus Torvalds on 02 January 2022, 22:23:25 UTC
Linux 5.16-rc8
Linux 5.16-rc8
Tip revision: c9e6606
hda_bus_type.c
// SPDX-License-Identifier: GPL-2.0-only
/*
* HD-audio bus
*/
#include <linux/init.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/export.h>
#include <sound/hdaudio.h>
MODULE_DESCRIPTION("HD-audio bus");
MODULE_LICENSE("GPL");
/**
* hdac_get_device_id - gets the hdac device id entry
* @hdev: HD-audio core device
* @drv: HD-audio codec driver
*
* Compares the hdac device vendor_id and revision_id to the hdac_device
* driver id_table and returns the matching device id entry.
*/
const struct hda_device_id *
hdac_get_device_id(struct hdac_device *hdev, struct hdac_driver *drv)
{
if (drv->id_table) {
const struct hda_device_id *id = drv->id_table;
while (id->vendor_id) {
if (hdev->vendor_id == id->vendor_id &&
(!id->rev_id || id->rev_id == hdev->revision_id))
return id;
id++;
}
}
return NULL;
}
EXPORT_SYMBOL_GPL(hdac_get_device_id);
static int hdac_codec_match(struct hdac_device *dev, struct hdac_driver *drv)
{
if (hdac_get_device_id(dev, drv))
return 1;
else
return 0;
}
static int hda_bus_match(struct device *dev, struct device_driver *drv)
{
struct hdac_device *hdev = dev_to_hdac_dev(dev);
struct hdac_driver *hdrv = drv_to_hdac_driver(drv);
if (hdev->type != hdrv->type)
return 0;
/*
* if driver provided a match function use that otherwise we will
* use hdac_codec_match function
*/
if (hdrv->match)
return hdrv->match(hdev, hdrv);
else
return hdac_codec_match(hdev, hdrv);
return 1;
}
static int hda_uevent(struct device *dev, struct kobj_uevent_env *env)
{
char modalias[32];
snd_hdac_codec_modalias(dev_to_hdac_dev(dev), modalias,
sizeof(modalias));
if (add_uevent_var(env, "MODALIAS=%s", modalias))
return -ENOMEM;
return 0;
}
struct bus_type snd_hda_bus_type = {
.name = "hdaudio",
.match = hda_bus_match,
.uevent = hda_uevent,
};
EXPORT_SYMBOL_GPL(snd_hda_bus_type);
static int __init hda_bus_init(void)
{
return bus_register(&snd_hda_bus_type);
}
static void __exit hda_bus_exit(void)
{
bus_unregister(&snd_hda_bus_type);
}
subsys_initcall(hda_bus_init);
module_exit(hda_bus_exit);