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 9 struct imx_spdif_data { 10 struct snd_soc_dai_link dai; 11 struct snd_soc_card card; 12 }; 13 14 static 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 76 end: 77 of_node_put(spdif_np); 78 79 return ret; 80 } 81 82 static const struct of_device_id imx_spdif_dt_ids[] = { 83 { .compatible = "fsl,imx-audio-spdif", }, 84 { /* sentinel */ } 85 }; 86 MODULE_DEVICE_TABLE(of, imx_spdif_dt_ids); 87 88 static 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 97 module_platform_driver(imx_spdif_driver); 98 99 MODULE_AUTHOR("Freescale Semiconductor, Inc."); 100 MODULE_DESCRIPTION("Freescale i.MX S/PDIF machine driver"); 101 MODULE_LICENSE("GPL v2"); 102 MODULE_ALIAS("platform:imx-spdif"); 103