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_dsp_common.c (2217B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2//
      3// Copyright(c) 2019 Intel Corporation. All rights reserved.
      4
      5#include <linux/module.h>
      6#include <sound/pcm.h>
      7#include <sound/soc.h>
      8#include <sound/hda_codec.h>
      9#include <sound/hda_i915.h>
     10#include "../../codecs/hdac_hda.h"
     11
     12#include "hda_dsp_common.h"
     13
     14#if IS_ENABLED(CONFIG_SND_SOC_SOF_HDA_AUDIO_CODEC)
     15
     16/*
     17 * Search card topology and return PCM device number
     18 * matching Nth HDMI device (zero-based index).
     19 */
     20static struct snd_pcm *hda_dsp_hdmi_pcm_handle(struct snd_soc_card *card,
     21					       int hdmi_idx)
     22{
     23	struct snd_soc_pcm_runtime *rtd;
     24	struct snd_pcm *spcm;
     25	int i = 0;
     26
     27	for_each_card_rtds(card, rtd) {
     28		spcm = rtd->pcm ?
     29			rtd->pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].pcm : NULL;
     30		if (spcm && strstr(spcm->id, "HDMI")) {
     31			if (i == hdmi_idx)
     32				return rtd->pcm;
     33			++i;
     34		}
     35	}
     36
     37	return NULL;
     38}
     39
     40/*
     41 * Search card topology and register HDMI PCM related controls
     42 * to codec driver.
     43 */
     44int hda_dsp_hdmi_build_controls(struct snd_soc_card *card,
     45				struct snd_soc_component *comp)
     46{
     47	struct hdac_hda_priv *hda_pvt;
     48	struct hda_codec *hcodec;
     49	struct snd_pcm *spcm;
     50	struct hda_pcm *hpcm;
     51	int err = 0, i = 0;
     52
     53	if (!comp)
     54		return -EINVAL;
     55
     56	hda_pvt = snd_soc_component_get_drvdata(comp);
     57	hcodec = &hda_pvt->codec;
     58
     59	list_for_each_entry(hpcm, &hcodec->pcm_list_head, list) {
     60		spcm = hda_dsp_hdmi_pcm_handle(card, i);
     61		if (spcm) {
     62			hpcm->pcm = spcm;
     63			hpcm->device = spcm->device;
     64			dev_dbg(card->dev,
     65				"%s: mapping HDMI converter %d to PCM %d (%p)\n",
     66				__func__, i, hpcm->device, spcm);
     67		} else {
     68			hpcm->pcm = NULL;
     69			hpcm->device = SNDRV_PCM_INVALID_DEVICE;
     70			dev_warn(card->dev,
     71				 "%s: no PCM in topology for HDMI converter %d\n",
     72				 __func__, i);
     73		}
     74		i++;
     75	}
     76	snd_hdac_display_power(hcodec->core.bus,
     77			       HDA_CODEC_IDX_CONTROLLER, true);
     78	err = snd_hda_codec_build_controls(hcodec);
     79	if (err < 0)
     80		dev_err(card->dev, "unable to create controls %d\n", err);
     81	snd_hdac_display_power(hcodec->core.bus,
     82			       HDA_CODEC_IDX_CONTROLLER, false);
     83
     84	return err;
     85}
     86EXPORT_SYMBOL_NS(hda_dsp_hdmi_build_controls, SND_SOC_INTEL_HDA_DSP_COMMON);
     87
     88#endif
     89
     90MODULE_DESCRIPTION("ASoC Intel HDMI helpers");
     91MODULE_LICENSE("GPL");