cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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hda_bus_type.c (2150B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * HD-audio bus
      4 */
      5#include <linux/init.h>
      6#include <linux/device.h>
      7#include <linux/module.h>
      8#include <linux/mod_devicetable.h>
      9#include <linux/export.h>
     10#include <sound/hdaudio.h>
     11
     12MODULE_DESCRIPTION("HD-audio bus");
     13MODULE_LICENSE("GPL");
     14
     15/**
     16 * hdac_get_device_id - gets the hdac device id entry
     17 * @hdev: HD-audio core device
     18 * @drv: HD-audio codec driver
     19 *
     20 * Compares the hdac device vendor_id and revision_id to the hdac_device
     21 * driver id_table and returns the matching device id entry.
     22 */
     23const struct hda_device_id *
     24hdac_get_device_id(struct hdac_device *hdev, struct hdac_driver *drv)
     25{
     26	if (drv->id_table) {
     27		const struct hda_device_id *id  = drv->id_table;
     28
     29		while (id->vendor_id) {
     30			if (hdev->vendor_id == id->vendor_id &&
     31				(!id->rev_id || id->rev_id == hdev->revision_id))
     32				return id;
     33			id++;
     34		}
     35	}
     36
     37	return NULL;
     38}
     39EXPORT_SYMBOL_GPL(hdac_get_device_id);
     40
     41static int hdac_codec_match(struct hdac_device *dev, struct hdac_driver *drv)
     42{
     43	if (hdac_get_device_id(dev, drv))
     44		return 1;
     45	else
     46		return 0;
     47}
     48
     49static int hda_bus_match(struct device *dev, struct device_driver *drv)
     50{
     51	struct hdac_device *hdev = dev_to_hdac_dev(dev);
     52	struct hdac_driver *hdrv = drv_to_hdac_driver(drv);
     53
     54	if (hdev->type != hdrv->type)
     55		return 0;
     56
     57	/*
     58	 * if driver provided a match function use that otherwise we will
     59	 * use hdac_codec_match function
     60	 */
     61	if (hdrv->match)
     62		return hdrv->match(hdev, hdrv);
     63	else
     64		return hdac_codec_match(hdev, hdrv);
     65	return 1;
     66}
     67
     68static int hda_uevent(struct device *dev, struct kobj_uevent_env *env)
     69{
     70	char modalias[32];
     71
     72	snd_hdac_codec_modalias(dev_to_hdac_dev(dev), modalias,
     73				sizeof(modalias));
     74	if (add_uevent_var(env, "MODALIAS=%s", modalias))
     75		return -ENOMEM;
     76	return 0;
     77}
     78
     79struct bus_type snd_hda_bus_type = {
     80	.name = "hdaudio",
     81	.match = hda_bus_match,
     82	.uevent = hda_uevent,
     83};
     84EXPORT_SYMBOL_GPL(snd_hda_bus_type);
     85
     86static int __init hda_bus_init(void)
     87{
     88	return bus_register(&snd_hda_bus_type);
     89}
     90
     91static void __exit hda_bus_exit(void)
     92{
     93	bus_unregister(&snd_hda_bus_type);
     94}
     95
     96subsys_initcall(hda_bus_init);
     97module_exit(hda_bus_exit);