153 lines
3.7 KiB
C
153 lines
3.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved.
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*/
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#include <linux/coresight.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/pm_runtime.h>
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#include "coresight-priv.h"
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struct dummy_drvdata {
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struct device *dev;
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struct coresight_device *csdev;
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};
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DEFINE_CORESIGHT_DEVLIST(source_devs, "dummy_source");
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DEFINE_CORESIGHT_DEVLIST(sink_devs, "dummy_sink");
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static int dummy_source_enable(struct coresight_device *csdev,
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struct perf_event *event, enum cs_mode mode)
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{
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dev_dbg(csdev->dev.parent, "Dummy source enabled\n");
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return 0;
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}
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static void dummy_source_disable(struct coresight_device *csdev,
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struct perf_event *event)
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{
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dev_dbg(csdev->dev.parent, "Dummy source disabled\n");
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}
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static int dummy_sink_enable(struct coresight_device *csdev, enum cs_mode mode,
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void *data)
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{
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dev_dbg(csdev->dev.parent, "Dummy sink enabled\n");
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return 0;
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}
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static int dummy_sink_disable(struct coresight_device *csdev)
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{
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dev_dbg(csdev->dev.parent, "Dummy sink disabled\n");
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return 0;
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}
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static const struct coresight_ops_source dummy_source_ops = {
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.enable = dummy_source_enable,
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.disable = dummy_source_disable,
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};
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static const struct coresight_ops dummy_source_cs_ops = {
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.source_ops = &dummy_source_ops,
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};
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static const struct coresight_ops_sink dummy_sink_ops = {
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.enable = dummy_sink_enable,
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.disable = dummy_sink_disable,
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};
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static const struct coresight_ops dummy_sink_cs_ops = {
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.sink_ops = &dummy_sink_ops,
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};
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static int dummy_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct device_node *node = dev->of_node;
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struct coresight_platform_data *pdata;
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struct dummy_drvdata *drvdata;
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struct coresight_desc desc = { 0 };
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if (of_device_is_compatible(node, "arm,coresight-dummy-source")) {
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desc.name = coresight_alloc_device_name(&source_devs, dev);
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if (!desc.name)
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return -ENOMEM;
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desc.type = CORESIGHT_DEV_TYPE_SOURCE;
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desc.subtype.source_subtype =
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CORESIGHT_DEV_SUBTYPE_SOURCE_OTHERS;
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desc.ops = &dummy_source_cs_ops;
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} else if (of_device_is_compatible(node, "arm,coresight-dummy-sink")) {
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desc.name = coresight_alloc_device_name(&sink_devs, dev);
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if (!desc.name)
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return -ENOMEM;
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desc.type = CORESIGHT_DEV_TYPE_SINK;
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desc.subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_DUMMY;
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desc.ops = &dummy_sink_cs_ops;
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} else {
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dev_err(dev, "Device type not set\n");
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return -EINVAL;
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}
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pdata = coresight_get_platform_data(dev);
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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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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.pdata = pdev->dev.platform_data;
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desc.dev = &pdev->dev;
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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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pm_runtime_enable(dev);
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dev_dbg(dev, "Dummy device initialized\n");
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return 0;
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}
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static void dummy_remove(struct platform_device *pdev)
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{
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struct dummy_drvdata *drvdata = platform_get_drvdata(pdev);
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struct device *dev = &pdev->dev;
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pm_runtime_disable(dev);
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coresight_unregister(drvdata->csdev);
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}
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static const struct of_device_id dummy_match[] = {
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{.compatible = "arm,coresight-dummy-source"},
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{.compatible = "arm,coresight-dummy-sink"},
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{},
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};
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static struct platform_driver dummy_driver = {
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.probe = dummy_probe,
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.remove_new = dummy_remove,
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.driver = {
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.name = "coresight-dummy",
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.of_match_table = dummy_match,
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},
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};
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module_platform_driver(dummy_driver);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("CoreSight dummy driver");
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