1 /* 2 * Copyright (C) 2013 Freescale Semiconductor, Inc. 3 * 4 * The code contained herein is licensed under the GNU General Public 5 * License. You may obtain a copy of the GNU General Public License 6 * Version 2 or later at the following locations: 7 * 8 * http://www.opensource.org/licenses/gpl-license.html 9 * http://www.gnu.org/copyleft/gpl.html 10 */ 11 12 #include <linux/module.h> 13 #include <linux/of_platform.h> 14 #include <sound/soc.h> 15 16 struct imx_spdif_data { 17 struct snd_soc_dai_link dai; 18 struct snd_soc_card card; 19 }; 20 21 static int imx_spdif_audio_probe(struct platform_device *pdev) 22 { 23 struct device_node *spdif_np, *np = pdev->dev.of_node; 24 struct imx_spdif_data *data; 25 int ret = 0; 26 27 spdif_np = of_parse_phandle(np, "spdif-controller", 0); 28 if (!spdif_np) { 29 dev_err(&pdev->dev, "failed to find spdif-controller\n"); 30 ret = -EINVAL; 31 goto end; 32 } 33 34 data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); 35 if (!data) { 36 ret = -ENOMEM; 37 goto end; 38 } 39 40 data->dai.name = "S/PDIF PCM"; 41 data->dai.stream_name = "S/PDIF PCM"; 42 data->dai.codec_dai_name = "snd-soc-dummy-dai"; 43 data->dai.codec_name = "snd-soc-dummy"; 44 data->dai.cpu_of_node = spdif_np; 45 data->dai.platform_of_node = spdif_np; 46 data->dai.playback_only = true; 47 data->dai.capture_only = true; 48 49 if (of_property_read_bool(np, "spdif-out")) 50 data->dai.capture_only = false; 51 52 if (of_property_read_bool(np, "spdif-in")) 53 data->dai.playback_only = false; 54 55 if (data->dai.playback_only && data->dai.capture_only) { 56 dev_err(&pdev->dev, "no enabled S/PDIF DAI link\n"); 57 goto end; 58 } 59 60 data->card.dev = &pdev->dev; 61 data->card.dai_link = &data->dai; 62 data->card.num_links = 1; 63 data->card.owner = THIS_MODULE; 64 65 ret = snd_soc_of_parse_card_name(&data->card, "model"); 66 if (ret) 67 goto end; 68 69 ret = devm_snd_soc_register_card(&pdev->dev, &data->card); 70 if (ret) { 71 dev_err(&pdev->dev, "snd_soc_register_card failed: %d\n", ret); 72 goto end; 73 } 74 75 platform_set_drvdata(pdev, data); 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 .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