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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Driver for Qualcomm Secure Execution Environment (SEE) interface (QSEECOM).
* Responsible for setting up and managing QSEECOM client devices.
*
* Copyright (C) 2023 Maximilian Luz <luzmaximilian@gmail.com>
*/
#include <linux/auxiliary_bus.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/firmware/qcom/qcom_qseecom.h>
#include <linux/firmware/qcom/qcom_scm.h>
struct qseecom_app_desc {
const char *app_name;
const char *dev_name;
};
static void qseecom_client_release(struct device *dev)
{
struct qseecom_client *client;
client = container_of(dev, struct qseecom_client, aux_dev.dev);
kfree(client);
}
static void qseecom_client_remove(void *data)
{
struct qseecom_client *client = data;
auxiliary_device_delete(&client->aux_dev);
auxiliary_device_uninit(&client->aux_dev);
}
static int qseecom_client_register(struct platform_device *qseecom_dev,
const struct qseecom_app_desc *desc)
{
struct qseecom_client *client;
u32 app_id;
int ret;
/* Try to find the app ID, skip device if not found */
ret = qcom_scm_qseecom_app_get_id(desc->app_name, &app_id);
if (ret)
return ret == -ENOENT ? 0 : ret;
dev_info(&qseecom_dev->dev, "setting up client for %s\n", desc->app_name);
/* Allocate and set-up the client device */
client = kzalloc(sizeof(*client), GFP_KERNEL);
if (!client)
return -ENOMEM;
client->aux_dev.name = desc->dev_name;
client->aux_dev.dev.parent = &qseecom_dev->dev;
client->aux_dev.dev.release = qseecom_client_release;
client->app_id = app_id;
ret = auxiliary_device_init(&client->aux_dev);
if (ret) {
kfree(client);
return ret;
}
ret = auxiliary_device_add(&client->aux_dev);
if (ret) {
auxiliary_device_uninit(&client->aux_dev);
return ret;
}
ret = devm_add_action_or_reset(&qseecom_dev->dev, qseecom_client_remove, client);
if (ret)
return ret;
return 0;
}
/*
* List of supported applications. One client device will be created per entry,
* assuming the app has already been loaded (usually by firmware bootloaders)
* and its ID can be queried successfully.
*/
static const struct qseecom_app_desc qcom_qseecom_apps[] = {
{ "qcom.tz.uefisecapp", "uefisecapp" },
};
static int qcom_qseecom_probe(struct platform_device *qseecom_dev)
{
int ret;
int i;
/* Set up client devices for each base application */
for (i = 0; i < ARRAY_SIZE(qcom_qseecom_apps); i++) {
ret = qseecom_client_register(qseecom_dev, &qcom_qseecom_apps[i]);
if (ret)
return ret;
}
return 0;
}
static struct platform_driver qcom_qseecom_driver = {
.driver = {
.name = "qcom_qseecom",
},
.probe = qcom_qseecom_probe,
};
static int __init qcom_qseecom_init(void)
{
return platform_driver_register(&qcom_qseecom_driver);
}
subsys_initcall(qcom_qseecom_init);
MODULE_AUTHOR("Maximilian Luz <luzmaximilian@gmail.com>");
MODULE_DESCRIPTION("Driver for the Qualcomm SEE (QSEECOM) interface");
MODULE_LICENSE("GPL");
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