| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * Copyright (c) 2016-2017, 2019 The Linux Foundation. All rights reserved. |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/platform_device.h> |
| #include <linux/coresight.h> |
| #include <linux/of.h> |
| |
| #define DUMMY_TRACE_ID_START 256 |
| |
| struct dummy_drvdata { |
| struct device *dev; |
| struct coresight_device *csdev; |
| int traceid; |
| }; |
| |
| DEFINE_CORESIGHT_DEVLIST(dummy_devs, "dummy"); |
| |
| static int dummy_source_enable(struct coresight_device *csdev, |
| struct perf_event *event, u32 mode) |
| { |
| struct dummy_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); |
| |
| dev_info(drvdata->dev, "Dummy source enabled\n"); |
| |
| return 0; |
| } |
| |
| static void dummy_source_disable(struct coresight_device *csdev, |
| struct perf_event *event) |
| { |
| struct dummy_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); |
| |
| dev_info(drvdata->dev, "Dummy source disabled\n"); |
| } |
| |
| static int dummy_sink_enable(struct coresight_device *csdev, u32 mode, |
| void *data) |
| { |
| struct dummy_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); |
| |
| dev_info(drvdata->dev, "Dummy sink enabled\n"); |
| |
| return 0; |
| } |
| |
| static int dummy_sink_disable(struct coresight_device *csdev) |
| { |
| struct dummy_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); |
| |
| dev_info(drvdata->dev, "Dummy sink disabled\n"); |
| |
| return 0; |
| } |
| |
| static int dummy_trace_id(struct coresight_device *csdev) |
| { |
| struct dummy_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); |
| |
| return drvdata->traceid; |
| } |
| |
| static const struct coresight_ops_source dummy_source_ops = { |
| .trace_id = dummy_trace_id, |
| .enable = dummy_source_enable, |
| .disable = dummy_source_disable, |
| }; |
| |
| static const struct coresight_ops_sink dummy_sink_ops = { |
| .enable = dummy_sink_enable, |
| .disable = dummy_sink_disable, |
| }; |
| |
| static const struct coresight_ops dummy_cs_ops = { |
| .source_ops = &dummy_source_ops, |
| .sink_ops = &dummy_sink_ops, |
| }; |
| |
| static int dummy_probe(struct platform_device *pdev) |
| { |
| struct device *dev = &pdev->dev; |
| struct coresight_platform_data *pdata; |
| struct dummy_drvdata *drvdata; |
| struct coresight_desc desc = { 0 }; |
| static int traceid = DUMMY_TRACE_ID_START; |
| |
| desc.name = coresight_alloc_device_name(&dummy_devs, dev); |
| if (!desc.name) |
| return -ENOMEM; |
| pdata = coresight_get_platform_data(dev); |
| if (IS_ERR(pdata)) |
| return PTR_ERR(pdata); |
| pdev->dev.platform_data = pdata; |
| |
| drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL); |
| if (!drvdata) |
| return -ENOMEM; |
| |
| drvdata->dev = &pdev->dev; |
| platform_set_drvdata(pdev, drvdata); |
| |
| drvdata->traceid = traceid++; |
| |
| if (of_property_read_bool(pdev->dev.of_node, "qcom,dummy-source")) { |
| desc.type = CORESIGHT_DEV_TYPE_SOURCE; |
| desc.subtype.source_subtype = |
| CORESIGHT_DEV_SUBTYPE_SOURCE_PROC; |
| } else if (of_property_read_bool(pdev->dev.of_node, |
| "qcom,dummy-sink")) { |
| desc.type = CORESIGHT_DEV_TYPE_SINK; |
| desc.subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_BUFFER; |
| } else { |
| dev_info(dev, "Device type not set\n"); |
| return -EINVAL; |
| } |
| |
| desc.ops = &dummy_cs_ops; |
| desc.pdata = pdev->dev.platform_data; |
| desc.dev = &pdev->dev; |
| drvdata->csdev = coresight_register(&desc); |
| if (IS_ERR(drvdata->csdev)) |
| return PTR_ERR(drvdata->csdev); |
| |
| dev_info(dev, "Dummy device initialized\n"); |
| |
| return 0; |
| } |
| |
| static int dummy_remove(struct platform_device *pdev) |
| { |
| struct dummy_drvdata *drvdata = platform_get_drvdata(pdev); |
| |
| coresight_unregister(drvdata->csdev); |
| return 0; |
| } |
| |
| static const struct of_device_id dummy_match[] = { |
| {.compatible = "qcom,coresight-dummy"}, |
| {}, |
| }; |
| |
| static struct platform_driver dummy_driver = { |
| .probe = dummy_probe, |
| .remove = dummy_remove, |
| .driver = { |
| .name = "coresight-dummy", |
| .of_match_table = dummy_match, |
| }, |
| }; |
| |
| int __init dummy_init(void) |
| { |
| return platform_driver_register(&dummy_driver); |
| } |
| module_init(dummy_init); |
| |
| void __exit dummy_exit(void) |
| { |
| platform_driver_unregister(&dummy_driver); |
| } |
| module_exit(dummy_exit); |
| |
| MODULE_LICENSE("GPL v2"); |
| MODULE_DESCRIPTION("CoreSight dummy source driver"); |