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, sizeof(*comp), GFP_KERNEL); 30 if (!data || !comp) { 31 ret = -ENOMEM; 32 goto end; 33 } 34 35 /* 36 * CPU == Platform 37 * platform is using soc-generic-dmaengine-pcm 38 */ 39 data->dai.cpus = 40 data->dai.platforms = comp; 41 data->dai.codecs = &snd_soc_dummy_dlc; 42 43 data->dai.num_cpus = 1; 44 data->dai.num_codecs = 1; 45 data->dai.num_platforms = 1; 46 47 data->dai.name = "S/PDIF PCM"; 48 data->dai.stream_name = "S/PDIF PCM"; 49 data->dai.cpus->of_node = spdif_np; 50 data->dai.playback_only = true; 51 data->dai.capture_only = true; 52 53 if (of_property_read_bool(np, "spdif-out")) 54 data->dai.capture_only = false; 55 56 if (of_property_read_bool(np, "spdif-in")) 57 data->dai.playback_only = false; 58 59 if (data->dai.playback_only && data->dai.capture_only) { 60 dev_err(&pdev->dev, "no enabled S/PDIF DAI link\n"); 61 goto end; 62 } 63 64 data->card.dev = &pdev->dev; 65 data->card.dai_link = &data->dai; 66 data->card.num_links = 1; 67 data->card.owner = THIS_MODULE; 68 69 ret = snd_soc_of_parse_card_name(&data->card, "model"); 70 if (ret) 71 goto end; 72 73 ret = devm_snd_soc_register_card(&pdev->dev, &data->card); 74 if (ret) 75 dev_err_probe(&pdev->dev, ret, "snd_soc_register_card failed\n"); 76 77 end: 78 of_node_put(spdif_np); 79 80 return ret; 81 } 82 83 static const struct of_device_id imx_spdif_dt_ids[] = { 84 { .compatible = "fsl,imx-audio-spdif", }, 85 { /* sentinel */ } 86 }; 87 MODULE_DEVICE_TABLE(of, imx_spdif_dt_ids); 88 89 static struct platform_driver imx_spdif_driver = { 90 .driver = { 91 .name = "imx-spdif", 92 .pm = &snd_soc_pm_ops, 93 .of_match_table = imx_spdif_dt_ids, 94 }, 95 .probe = imx_spdif_audio_probe, 96 }; 97 98 module_platform_driver(imx_spdif_driver); 99 100 MODULE_AUTHOR("Freescale Semiconductor, Inc."); 101 MODULE_DESCRIPTION("Freescale i.MX S/PDIF machine driver"); 102 MODULE_LICENSE("GPL v2"); 103 MODULE_ALIAS("platform:imx-spdif"); 104