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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imx-spdif.c (2553B)

      1// SPDX-License-Identifier: GPL-2.0+
      2//
      3// Copyright (C) 2013 Freescale Semiconductor, Inc.
      4
      5#include <linux/module.h>
      6#include <linux/of_platform.h>
      7#include <sound/soc.h>
      8
      9struct imx_spdif_data {
     10	struct snd_soc_dai_link dai;
     11	struct snd_soc_card card;
     12};
     13
     14static int imx_spdif_audio_probe(struct platform_device *pdev)
     15{
     16	struct device_node *spdif_np, *np = pdev->dev.of_node;
     17	struct imx_spdif_data *data;
     18	struct snd_soc_dai_link_component *comp;
     19	int ret = 0;
     20
     21	spdif_np = of_parse_phandle(np, "spdif-controller", 0);
     22	if (!spdif_np) {
     23		dev_err(&pdev->dev, "failed to find spdif-controller\n");
     24		ret = -EINVAL;
     25		goto end;
     26	}
     27
     28	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
     29	comp = devm_kzalloc(&pdev->dev, 3 * sizeof(*comp), GFP_KERNEL);
     30	if (!data || !comp) {
     31		ret = -ENOMEM;
     32		goto end;
     33	}
     34
     35	data->dai.cpus		= &comp[0];
     36	data->dai.codecs	= &comp[1];
     37	data->dai.platforms	= &comp[2];
     38
     39	data->dai.num_cpus	= 1;
     40	data->dai.num_codecs	= 1;
     41	data->dai.num_platforms	= 1;
     42
     43	data->dai.name = "S/PDIF PCM";
     44	data->dai.stream_name = "S/PDIF PCM";
     45	data->dai.codecs->dai_name = "snd-soc-dummy-dai";
     46	data->dai.codecs->name = "snd-soc-dummy";
     47	data->dai.cpus->of_node = spdif_np;
     48	data->dai.platforms->of_node = spdif_np;
     49	data->dai.playback_only = true;
     50	data->dai.capture_only = true;
     51
     52	if (of_property_read_bool(np, "spdif-out"))
     53		data->dai.capture_only = false;
     54
     55	if (of_property_read_bool(np, "spdif-in"))
     56		data->dai.playback_only = false;
     57
     58	if (data->dai.playback_only && data->dai.capture_only) {
     59		dev_err(&pdev->dev, "no enabled S/PDIF DAI link\n");
     60		goto end;
     61	}
     62
     63	data->card.dev = &pdev->dev;
     64	data->card.dai_link = &data->dai;
     65	data->card.num_links = 1;
     66	data->card.owner = THIS_MODULE;
     67
     68	ret = snd_soc_of_parse_card_name(&data->card, "model");
     69	if (ret)
     70		goto end;
     71
     72	ret = devm_snd_soc_register_card(&pdev->dev, &data->card);
     73	if (ret)
     74		dev_err_probe(&pdev->dev, ret, "snd_soc_register_card failed\n");
     75
     76end:
     77	of_node_put(spdif_np);
     78
     79	return ret;
     80}
     81
     82static const struct of_device_id imx_spdif_dt_ids[] = {
     83	{ .compatible = "fsl,imx-audio-spdif", },
     84	{ /* sentinel */ }
     85};
     86MODULE_DEVICE_TABLE(of, imx_spdif_dt_ids);
     87
     88static struct platform_driver imx_spdif_driver = {
     89	.driver = {
     90		.name = "imx-spdif",
     91		.pm = &snd_soc_pm_ops,
     92		.of_match_table = imx_spdif_dt_ids,
     93	},
     94	.probe = imx_spdif_audio_probe,
     95};
     96
     97module_platform_driver(imx_spdif_driver);
     98
     99MODULE_AUTHOR("Freescale Semiconductor, Inc.");
    100MODULE_DESCRIPTION("Freescale i.MX S/PDIF machine driver");
    101MODULE_LICENSE("GPL v2");
    102MODULE_ALIAS("platform:imx-spdif");