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Documentation/devicetree/bindings/sound/imx-audio-spdif.txt
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| Freescale i.MX audio complex with S/PDIF transceiver | ||
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| Required properties: | ||
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| - compatible : "fsl,imx-audio-spdif" | ||
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| - model : The user-visible name of this sound complex | ||
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| - spdif-controller : The phandle of the i.MX S/PDIF controller | ||
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| Optional properties: | ||
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| - spdif-out : This is a boolean property. If present, the transmitting | ||
| function of S/PDIF will be enabled, indicating there's a physical | ||
| S/PDIF out connector/jack on the board or it's connecting to some | ||
| other IP block, such as an HDMI encoder/display-controller. | ||
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| - spdif-in : This is a boolean property. If present, the receiving | ||
| function of S/PDIF will be enabled, indicating there's a physical | ||
| S/PDIF in connector/jack on the board. | ||
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| * Note: At least one of these two properties should be set in the DT binding. | ||
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| Example: | ||
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| sound-spdif { | ||
| compatible = "fsl,imx-audio-spdif"; | ||
| model = "imx-spdif"; | ||
| spdif-controller = <&spdif>; | ||
| spdif-out; | ||
| spdif-in; | ||
| }; |
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| /* | ||
| * Copyright (C) 2013 Freescale Semiconductor, Inc. | ||
| * | ||
| * The code contained herein is licensed under the GNU General Public | ||
| * License. You may obtain a copy of the GNU General Public License | ||
| * Version 2 or later at the following locations: | ||
| * | ||
| * http://www.opensource.org/licenses/gpl-license.html | ||
| * http://www.gnu.org/copyleft/gpl.html | ||
| */ | ||
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| #include <linux/module.h> | ||
| #include <linux/of_platform.h> | ||
| #include <sound/soc.h> | ||
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| struct imx_spdif_data { | ||
| struct snd_soc_dai_link dai[2]; | ||
| struct snd_soc_card card; | ||
| struct platform_device *txdev; | ||
| struct platform_device *rxdev; | ||
| }; | ||
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| static int imx_spdif_audio_probe(struct platform_device *pdev) | ||
| { | ||
| struct device_node *spdif_np, *np = pdev->dev.of_node; | ||
| struct imx_spdif_data *data; | ||
| int ret = 0, num_links = 0; | ||
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| spdif_np = of_parse_phandle(np, "spdif-controller", 0); | ||
| if (!spdif_np) { | ||
| dev_err(&pdev->dev, "failed to find spdif-controller\n"); | ||
| ret = -EINVAL; | ||
| goto end; | ||
| } | ||
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| data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); | ||
| if (!data) { | ||
| dev_err(&pdev->dev, "failed to allocate memory\n"); | ||
| ret = -ENOMEM; | ||
| goto end; | ||
| } | ||
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| if (of_property_read_bool(np, "spdif-out")) { | ||
| data->dai[num_links].name = "S/PDIF TX"; | ||
| data->dai[num_links].stream_name = "S/PDIF PCM Playback"; | ||
| data->dai[num_links].codec_dai_name = "dit-hifi"; | ||
| data->dai[num_links].codec_name = "spdif-dit"; | ||
| data->dai[num_links].cpu_of_node = spdif_np; | ||
| data->dai[num_links].platform_of_node = spdif_np; | ||
| num_links++; | ||
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| data->txdev = platform_device_register_simple("spdif-dit", -1, NULL, 0); | ||
| if (IS_ERR(data->txdev)) { | ||
| ret = PTR_ERR(data->txdev); | ||
| dev_err(&pdev->dev, "register dit failed: %d\n", ret); | ||
| goto end; | ||
| } | ||
| } | ||
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| if (of_property_read_bool(np, "spdif-in")) { | ||
| data->dai[num_links].name = "S/PDIF RX"; | ||
| data->dai[num_links].stream_name = "S/PDIF PCM Capture"; | ||
| data->dai[num_links].codec_dai_name = "dir-hifi"; | ||
| data->dai[num_links].codec_name = "spdif-dir"; | ||
| data->dai[num_links].cpu_of_node = spdif_np; | ||
| data->dai[num_links].platform_of_node = spdif_np; | ||
| num_links++; | ||
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| data->rxdev = platform_device_register_simple("spdif-dir", -1, NULL, 0); | ||
| if (IS_ERR(data->rxdev)) { | ||
| ret = PTR_ERR(data->rxdev); | ||
| dev_err(&pdev->dev, "register dir failed: %d\n", ret); | ||
| goto error_dit; | ||
| } | ||
| } | ||
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| if (!num_links) { | ||
| dev_err(&pdev->dev, "no enabled S/PDIF DAI link\n"); | ||
| goto error_dir; | ||
| } | ||
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| data->card.dev = &pdev->dev; | ||
| data->card.num_links = num_links; | ||
| data->card.dai_link = data->dai; | ||
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| ret = snd_soc_of_parse_card_name(&data->card, "model"); | ||
| if (ret) | ||
| goto error_dir; | ||
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| ret = snd_soc_register_card(&data->card); | ||
| if (ret) { | ||
| dev_err(&pdev->dev, "snd_soc_register_card failed: %d\n", ret); | ||
| goto error_dir; | ||
| } | ||
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| platform_set_drvdata(pdev, data); | ||
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| goto end; | ||
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| error_dir: | ||
| if (data->rxdev) | ||
| platform_device_unregister(data->rxdev); | ||
| error_dit: | ||
| if (data->txdev) | ||
| platform_device_unregister(data->txdev); | ||
| end: | ||
| if (spdif_np) | ||
| of_node_put(spdif_np); | ||
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| return ret; | ||
| } | ||
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| static int imx_spdif_audio_remove(struct platform_device *pdev) | ||
| { | ||
| struct imx_spdif_data *data = platform_get_drvdata(pdev); | ||
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| if (data->rxdev) | ||
| platform_device_unregister(data->rxdev); | ||
| if (data->txdev) | ||
| platform_device_unregister(data->txdev); | ||
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| snd_soc_unregister_card(&data->card); | ||
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| return 0; | ||
| } | ||
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| static const struct of_device_id imx_spdif_dt_ids[] = { | ||
| { .compatible = "fsl,imx-audio-spdif", }, | ||
| { /* sentinel */ } | ||
| }; | ||
| MODULE_DEVICE_TABLE(of, imx_spdif_dt_ids); | ||
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| static struct platform_driver imx_spdif_driver = { | ||
| .driver = { | ||
| .name = "imx-spdif", | ||
| .owner = THIS_MODULE, | ||
| .of_match_table = imx_spdif_dt_ids, | ||
| }, | ||
| .probe = imx_spdif_audio_probe, | ||
| .remove = imx_spdif_audio_remove, | ||
| }; | ||
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| module_platform_driver(imx_spdif_driver); | ||
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| MODULE_AUTHOR("Freescale Semiconductor, Inc."); | ||
| MODULE_DESCRIPTION("Freescale i.MX S/PDIF machine driver"); | ||
| MODULE_LICENSE("GPL v2"); | ||
| MODULE_ALIAS("platform:imx-spdif"); |