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// SPDX-License-Identifier: GPL-2.0-only
//
// Copyright(c) 2023 Google Inc
//
// Author: Curtis Malainey <cujomalainey@chromium.org>
//
#include <linux/auxiliary_bus.h>
#include <linux/debugfs.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/pm_runtime.h>
#include <sound/sof/header.h>
#include "sof-client.h"
#define SOF_IPC_CLIENT_SUSPEND_DELAY_MS 3000
struct sof_msg_inject_priv {
struct dentry *kernel_dfs_file;
size_t max_msg_size;
void *kernel_buffer;
};
static int sof_msg_inject_dfs_open(struct inode *inode, struct file *file)
{
int ret = debugfs_file_get(file->f_path.dentry);
if (unlikely(ret))
return ret;
ret = simple_open(inode, file);
if (ret)
debugfs_file_put(file->f_path.dentry);
return ret;
}
static ssize_t sof_kernel_msg_inject_dfs_write(struct file *file, const char __user *buffer,
size_t count, loff_t *ppos)
{
struct sof_client_dev *cdev = file->private_data;
struct sof_msg_inject_priv *priv = cdev->data;
struct sof_ipc_cmd_hdr *hdr = priv->kernel_buffer;
struct device *dev = &cdev->auxdev.dev;
ssize_t size;
int ret;
if (*ppos)
return 0;
size = simple_write_to_buffer(priv->kernel_buffer, priv->max_msg_size,
ppos, buffer, count);
if (size < 0)
return size;
if (size != count)
return -EFAULT;
ret = pm_runtime_resume_and_get(dev);
if (ret < 0 && ret != -EACCES) {
dev_err_ratelimited(dev, "debugfs write failed to resume %d\n", ret);
return ret;
}
sof_client_ipc_rx_message(cdev, hdr, priv->kernel_buffer);
ret = pm_runtime_put_autosuspend(dev);
if (ret < 0)
dev_err_ratelimited(dev, "debugfs write failed to idle %d\n", ret);
return count;
};
static int sof_msg_inject_dfs_release(struct inode *inode, struct file *file)
{
debugfs_file_put(file->f_path.dentry);
return 0;
}
static const struct file_operations sof_kernel_msg_inject_fops = {
.open = sof_msg_inject_dfs_open,
.write = sof_kernel_msg_inject_dfs_write,
.release = sof_msg_inject_dfs_release,
.owner = THIS_MODULE,
};
static int sof_msg_inject_probe(struct auxiliary_device *auxdev,
const struct auxiliary_device_id *id)
{
struct sof_client_dev *cdev = auxiliary_dev_to_sof_client_dev(auxdev);
struct dentry *debugfs_root = sof_client_get_debugfs_root(cdev);
struct device *dev = &auxdev->dev;
struct sof_msg_inject_priv *priv;
size_t alloc_size;
/* allocate memory for client data */
priv = devm_kzalloc(&auxdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->max_msg_size = sof_client_get_ipc_max_payload_size(cdev);
alloc_size = priv->max_msg_size;
priv->kernel_buffer = devm_kmalloc(dev, alloc_size, GFP_KERNEL);
if (!priv->kernel_buffer)
return -ENOMEM;
cdev->data = priv;
priv->kernel_dfs_file = debugfs_create_file("kernel_ipc_msg_inject", 0644,
debugfs_root, cdev,
&sof_kernel_msg_inject_fops);
/* enable runtime PM */
pm_runtime_set_autosuspend_delay(dev, SOF_IPC_CLIENT_SUSPEND_DELAY_MS);
pm_runtime_use_autosuspend(dev);
pm_runtime_set_active(dev);
pm_runtime_enable(dev);
pm_runtime_mark_last_busy(dev);
pm_runtime_idle(dev);
return 0;
}
static void sof_msg_inject_remove(struct auxiliary_device *auxdev)
{
struct sof_client_dev *cdev = auxiliary_dev_to_sof_client_dev(auxdev);
struct sof_msg_inject_priv *priv = cdev->data;
pm_runtime_disable(&auxdev->dev);
debugfs_remove(priv->kernel_dfs_file);
}
static const struct auxiliary_device_id sof_msg_inject_client_id_table[] = {
{ .name = "snd_sof.kernel_injector" },
{},
};
MODULE_DEVICE_TABLE(auxiliary, sof_msg_inject_client_id_table);
/*
* No need for driver pm_ops as the generic pm callbacks in the auxiliary bus
* type are enough to ensure that the parent SOF device resumes to bring the DSP
* back to D0.
* Driver name will be set based on KBUILD_MODNAME.
*/
static struct auxiliary_driver sof_msg_inject_client_drv = {
.probe = sof_msg_inject_probe,
.remove = sof_msg_inject_remove,
.id_table = sof_msg_inject_client_id_table,
};
module_auxiliary_driver(sof_msg_inject_client_drv);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("SOF IPC Kernel Injector Client Driver");
MODULE_IMPORT_NS("SND_SOC_SOF_CLIENT");
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