133 lines
3.3 KiB
C
133 lines
3.3 KiB
C
/* Copyright (c) 2013, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/device.h>
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#include <linux/platform_device.h>
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#include <linux/io.h>
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#include <linux/err.h>
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#include <linux/sysfs.h>
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#include <linux/of_coresight.h>
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#include <linux/coresight.h>
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struct audio_etm_drvdata {
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struct device *dev;
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struct coresight_device *csdev;
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};
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static int audio_etm_enable(struct coresight_device *csdev)
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{
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struct audio_etm_drvdata *drvdata =
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dev_get_drvdata(csdev->dev.parent);
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dev_info(drvdata->dev, "Audio ETM tracing enabled\n");
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return 0;
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}
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static void audio_etm_disable(struct coresight_device *csdev)
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{
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struct audio_etm_drvdata *drvdata =
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dev_get_drvdata(csdev->dev.parent);
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dev_info(drvdata->dev, "Audio ETM tracing disabled\n");
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}
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static const struct coresight_ops_source audio_etm_source_ops = {
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.enable = audio_etm_enable,
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.disable = audio_etm_disable,
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};
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static const struct coresight_ops audio_cs_ops = {
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.source_ops = &audio_etm_source_ops,
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};
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static int audio_etm_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct coresight_platform_data *pdata;
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struct audio_etm_drvdata *drvdata;
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struct coresight_desc *desc;
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if (pdev->dev.of_node) {
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pdata = of_get_coresight_platform_data(dev, pdev->dev.of_node);
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if (IS_ERR(pdata))
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return PTR_ERR(pdata);
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pdev->dev.platform_data = pdata;
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}
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drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
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if (!drvdata)
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return -ENOMEM;
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drvdata->dev = &pdev->dev;
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platform_set_drvdata(pdev, drvdata);
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desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
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if (!desc)
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return -ENOMEM;
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desc->type = CORESIGHT_DEV_TYPE_SOURCE;
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desc->subtype.source_subtype = CORESIGHT_DEV_SUBTYPE_SOURCE_PROC;
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desc->ops = &audio_cs_ops;
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desc->pdata = pdev->dev.platform_data;
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desc->dev = &pdev->dev;
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desc->owner = THIS_MODULE;
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drvdata->csdev = coresight_register(desc);
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if (IS_ERR(drvdata->csdev))
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return PTR_ERR(drvdata->csdev);
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dev_info(dev, "Audio ETM initialized\n");
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return 0;
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}
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static int audio_etm_remove(struct platform_device *pdev)
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{
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struct audio_etm_drvdata *drvdata = platform_get_drvdata(pdev);
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coresight_unregister(drvdata->csdev);
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return 0;
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}
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static struct of_device_id audio_etm_match[] = {
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{.compatible = "qcom,coresight-audio-etm"},
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{}
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};
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static struct platform_driver audio_etm_driver = {
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.probe = audio_etm_probe,
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.remove = audio_etm_remove,
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.driver = {
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.name = "coresight-audio-etm",
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.owner = THIS_MODULE,
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.of_match_table = audio_etm_match,
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},
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};
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int __init audio_etm_init(void)
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{
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return platform_driver_register(&audio_etm_driver);
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}
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module_init(audio_etm_init);
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void __exit audio_etm_exit(void)
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{
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platform_driver_unregister(&audio_etm_driver);
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}
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module_exit(audio_etm_exit);
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("CoreSight Audio ETM driver");
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