blob: cdf44bfa66feaa5b1d2adc20ec2f22babf888667 [file] [log] [blame]
/* Copyright (c) 2013, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/err.h>
#include <linux/sysfs.h>
#include <linux/of_coresight.h>
#include <linux/coresight.h>
struct audio_etm_drvdata {
struct device *dev;
struct coresight_device *csdev;
};
static int audio_etm_enable(struct coresight_device *csdev)
{
struct audio_etm_drvdata *drvdata =
dev_get_drvdata(csdev->dev.parent);
dev_info(drvdata->dev, "Audio ETM tracing enabled\n");
return 0;
}
static void audio_etm_disable(struct coresight_device *csdev)
{
struct audio_etm_drvdata *drvdata =
dev_get_drvdata(csdev->dev.parent);
dev_info(drvdata->dev, "Audio ETM tracing disabled\n");
}
static const struct coresight_ops_source audio_etm_source_ops = {
.enable = audio_etm_enable,
.disable = audio_etm_disable,
};
static const struct coresight_ops audio_cs_ops = {
.source_ops = &audio_etm_source_ops,
};
static int audio_etm_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct coresight_platform_data *pdata;
struct audio_etm_drvdata *drvdata;
struct coresight_desc *desc;
if (pdev->dev.of_node) {
pdata = of_get_coresight_platform_data(dev, pdev->dev.of_node);
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);
desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
if (!desc)
return -ENOMEM;
desc->type = CORESIGHT_DEV_TYPE_SOURCE;
desc->subtype.source_subtype = CORESIGHT_DEV_SUBTYPE_SOURCE_PROC;
desc->ops = &audio_cs_ops;
desc->pdata = pdev->dev.platform_data;
desc->dev = &pdev->dev;
desc->owner = THIS_MODULE;
drvdata->csdev = coresight_register(desc);
if (IS_ERR(drvdata->csdev))
return PTR_ERR(drvdata->csdev);
dev_info(dev, "Audio ETM initialized\n");
return 0;
}
static int audio_etm_remove(struct platform_device *pdev)
{
struct audio_etm_drvdata *drvdata = platform_get_drvdata(pdev);
coresight_unregister(drvdata->csdev);
return 0;
}
static struct of_device_id audio_etm_match[] = {
{.compatible = "qcom,coresight-audio-etm"},
{}
};
static struct platform_driver audio_etm_driver = {
.probe = audio_etm_probe,
.remove = audio_etm_remove,
.driver = {
.name = "coresight-audio-etm",
.owner = THIS_MODULE,
.of_match_table = audio_etm_match,
},
};
int __init audio_etm_init(void)
{
return platform_driver_register(&audio_etm_driver);
}
module_init(audio_etm_init);
void __exit audio_etm_exit(void)
{
platform_driver_unregister(&audio_etm_driver);
}
module_exit(audio_etm_exit);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("CoreSight Audio ETM driver");