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 int ret = 0; 19 20 spdif_np = of_parse_phandle(np, "spdif-controller", 0); 21 if (!spdif_np) { 22 dev_err(&pdev->dev, "failed to find spdif-controller\n"); 23 ret = -EINVAL; 24 goto end; 25 } 26 27 data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); 28 if (!data) { 29 ret = -ENOMEM; 30 goto end; 31 } 32 33 data->dai.name = "S/PDIF PCM"; 34 data->dai.stream_name = "S/PDIF PCM"; 35 data->dai.codec_dai_name = "snd-soc-dummy-dai"; 36 data->dai.codec_name = "snd-soc-dummy"; 37 data->dai.cpu_of_node = spdif_np; 38 data->dai.platform_of_node = spdif_np; 39 data->dai.playback_only = true; 40 data->dai.capture_only = true; 41 42 if (of_property_read_bool(np, "spdif-out")) 43 data->dai.capture_only = false; 44 45 if (of_property_read_bool(np, "spdif-in")) 46 data->dai.playback_only = false; 47 48 if (data->dai.playback_only && data->dai.capture_only) { 49 dev_err(&pdev->dev, "no enabled S/PDIF DAI link\n"); 50 goto end; 51 } 52 53 data->card.dev = &pdev->dev; 54 data->card.dai_link = &data->dai; 55 data->card.num_links = 1; 56 data->card.owner = THIS_MODULE; 57 58 ret = snd_soc_of_parse_card_name(&data->card, "model"); 59 if (ret) 60 goto end; 61 62 ret = devm_snd_soc_register_card(&pdev->dev, &data->card); 63 if (ret && ret != -EPROBE_DEFER) 64 dev_err(&pdev->dev, "snd_soc_register_card failed: %d\n", ret); 65 66 end: 67 of_node_put(spdif_np); 68 69 return ret; 70 } 71 72 static const struct of_device_id imx_spdif_dt_ids[] = { 73 { .compatible = "fsl,imx-audio-spdif", }, 74 { /* sentinel */ } 75 }; 76 MODULE_DEVICE_TABLE(of, imx_spdif_dt_ids); 77 78 static struct platform_driver imx_spdif_driver = { 79 .driver = { 80 .name = "imx-spdif", 81 .pm = &snd_soc_pm_ops, 82 .of_match_table = imx_spdif_dt_ids, 83 }, 84 .probe = imx_spdif_audio_probe, 85 }; 86 87 module_platform_driver(imx_spdif_driver); 88 89 MODULE_AUTHOR("Freescale Semiconductor, Inc."); 90 MODULE_DESCRIPTION("Freescale i.MX S/PDIF machine driver"); 91 MODULE_LICENSE("GPL v2"); 92 MODULE_ALIAS("platform:imx-spdif"); 93