// 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/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;	} 	ret = sof_client_boot_dsp(cdev);	if (!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");