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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snd_ac97_compat.c (3041B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 *  Copyright (C) 2016 Robert Jarzmik <robert.jarzmik@free.fr>
      4 */
      5
      6#include <linux/list.h>
      7#include <linux/slab.h>
      8#include <sound/ac97/codec.h>
      9#include <sound/ac97/compat.h>
     10#include <sound/ac97/controller.h>
     11#include <sound/soc.h>
     12
     13#include "ac97_core.h"
     14
     15static void compat_ac97_release(struct device *dev)
     16{
     17	kfree(to_ac97_t(dev));
     18}
     19
     20static void compat_ac97_reset(struct snd_ac97 *ac97)
     21{
     22	struct ac97_codec_device *adev = to_ac97_device(ac97->private_data);
     23	struct ac97_controller *actrl = adev->ac97_ctrl;
     24
     25	if (actrl->ops->reset)
     26		actrl->ops->reset(actrl);
     27}
     28
     29static void compat_ac97_warm_reset(struct snd_ac97 *ac97)
     30{
     31	struct ac97_codec_device *adev = to_ac97_device(ac97->private_data);
     32	struct ac97_controller *actrl = adev->ac97_ctrl;
     33
     34	if (actrl->ops->warm_reset)
     35		actrl->ops->warm_reset(actrl);
     36}
     37
     38static void compat_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
     39			      unsigned short val)
     40{
     41	struct ac97_codec_device *adev = to_ac97_device(ac97->private_data);
     42	struct ac97_controller *actrl = adev->ac97_ctrl;
     43
     44	actrl->ops->write(actrl, ac97->num, reg, val);
     45}
     46
     47static unsigned short compat_ac97_read(struct snd_ac97 *ac97,
     48				       unsigned short reg)
     49{
     50	struct ac97_codec_device *adev = to_ac97_device(ac97->private_data);
     51	struct ac97_controller *actrl = adev->ac97_ctrl;
     52
     53	return actrl->ops->read(actrl, ac97->num, reg);
     54}
     55
     56static const struct snd_ac97_bus_ops compat_snd_ac97_bus_ops = {
     57	.reset = compat_ac97_reset,
     58	.warm_reset = compat_ac97_warm_reset,
     59	.write = compat_ac97_write,
     60	.read = compat_ac97_read,
     61};
     62
     63static struct snd_ac97_bus compat_soc_ac97_bus = {
     64	.ops = &compat_snd_ac97_bus_ops,
     65};
     66
     67struct snd_ac97 *snd_ac97_compat_alloc(struct ac97_codec_device *adev)
     68{
     69	struct snd_ac97 *ac97;
     70	int ret;
     71
     72	ac97 = kzalloc(sizeof(struct snd_ac97), GFP_KERNEL);
     73	if (ac97 == NULL)
     74		return ERR_PTR(-ENOMEM);
     75
     76	ac97->private_data = adev;
     77	ac97->bus = &compat_soc_ac97_bus;
     78
     79	ac97->dev.parent = &adev->dev;
     80	ac97->dev.release = compat_ac97_release;
     81	dev_set_name(&ac97->dev, "%s-compat", dev_name(&adev->dev));
     82	ret = device_register(&ac97->dev);
     83	if (ret) {
     84		put_device(&ac97->dev);
     85		return ERR_PTR(ret);
     86	}
     87
     88	return ac97;
     89}
     90EXPORT_SYMBOL_GPL(snd_ac97_compat_alloc);
     91
     92void snd_ac97_compat_release(struct snd_ac97 *ac97)
     93{
     94	device_unregister(&ac97->dev);
     95}
     96EXPORT_SYMBOL_GPL(snd_ac97_compat_release);
     97
     98int snd_ac97_reset(struct snd_ac97 *ac97, bool try_warm, unsigned int id,
     99	unsigned int id_mask)
    100{
    101	struct ac97_codec_device *adev = to_ac97_device(ac97->private_data);
    102	struct ac97_controller *actrl = adev->ac97_ctrl;
    103	unsigned int scanned;
    104
    105	if (try_warm) {
    106		compat_ac97_warm_reset(ac97);
    107		scanned = snd_ac97_bus_scan_one(actrl, adev->num);
    108		if (ac97_ids_match(scanned, adev->vendor_id, id_mask))
    109			return 1;
    110	}
    111
    112	compat_ac97_reset(ac97);
    113	compat_ac97_warm_reset(ac97);
    114	scanned = snd_ac97_bus_scan_one(actrl, adev->num);
    115	if (ac97_ids_match(scanned, adev->vendor_id, id_mask))
    116		return 0;
    117
    118	return -ENODEV;
    119}
    120EXPORT_SYMBOL_GPL(snd_ac97_reset);