1 // SPDX-License-Identifier: GPL-2.0-only
3 // Copyright(c) 2023 Google Inc. All rights reserved.
5 // Author: Curtis Malainey <cujomalainey@chromium.org>
8 #include <linux/auxiliary_bus.h>
9 #include <linux/debugfs.h>
10 #include <linux/mod_devicetable.h>
11 #include <linux/module.h>
12 #include <linux/pm_runtime.h>
13 #include <sound/sof/header.h>
15 #include "sof-client.h"
17 #define SOF_IPC_CLIENT_SUSPEND_DELAY_MS 3000
19 struct sof_msg_inject_priv {
20 struct dentry *kernel_dfs_file;
26 static int sof_msg_inject_dfs_open(struct inode *inode, struct file *file)
28 int ret = debugfs_file_get(file->f_path.dentry);
33 ret = simple_open(inode, file);
35 debugfs_file_put(file->f_path.dentry);
40 static ssize_t sof_kernel_msg_inject_dfs_write(struct file *file, const char __user *buffer,
41 size_t count, loff_t *ppos)
43 struct sof_client_dev *cdev = file->private_data;
44 struct sof_msg_inject_priv *priv = cdev->data;
45 struct sof_ipc_cmd_hdr *hdr = priv->kernel_buffer;
46 struct device *dev = &cdev->auxdev.dev;
53 size = simple_write_to_buffer(priv->kernel_buffer, priv->max_msg_size,
60 ret = pm_runtime_resume_and_get(dev);
61 if (ret < 0 && ret != -EACCES) {
62 dev_err_ratelimited(dev, "debugfs write failed to resume %d\n", ret);
66 sof_client_ipc_rx_message(cdev, hdr, priv->kernel_buffer);
68 pm_runtime_mark_last_busy(dev);
69 ret = pm_runtime_put_autosuspend(dev);
71 dev_err_ratelimited(dev, "debugfs write failed to idle %d\n", ret);
76 static int sof_msg_inject_dfs_release(struct inode *inode, struct file *file)
78 debugfs_file_put(file->f_path.dentry);
83 static const struct file_operations sof_kernel_msg_inject_fops = {
84 .open = sof_msg_inject_dfs_open,
85 .write = sof_kernel_msg_inject_dfs_write,
86 .release = sof_msg_inject_dfs_release,
91 static int sof_msg_inject_probe(struct auxiliary_device *auxdev,
92 const struct auxiliary_device_id *id)
94 struct sof_client_dev *cdev = auxiliary_dev_to_sof_client_dev(auxdev);
95 struct dentry *debugfs_root = sof_client_get_debugfs_root(cdev);
96 struct device *dev = &auxdev->dev;
97 struct sof_msg_inject_priv *priv;
100 /* allocate memory for client data */
101 priv = devm_kzalloc(&auxdev->dev, sizeof(*priv), GFP_KERNEL);
105 priv->max_msg_size = sof_client_get_ipc_max_payload_size(cdev);
106 alloc_size = priv->max_msg_size;
107 priv->kernel_buffer = devm_kmalloc(dev, alloc_size, GFP_KERNEL);
109 if (!priv->kernel_buffer)
114 priv->kernel_dfs_file = debugfs_create_file("kernel_ipc_msg_inject", 0644,
116 &sof_kernel_msg_inject_fops);
118 /* enable runtime PM */
119 pm_runtime_set_autosuspend_delay(dev, SOF_IPC_CLIENT_SUSPEND_DELAY_MS);
120 pm_runtime_use_autosuspend(dev);
121 pm_runtime_set_active(dev);
122 pm_runtime_enable(dev);
123 pm_runtime_mark_last_busy(dev);
124 pm_runtime_idle(dev);
129 static void sof_msg_inject_remove(struct auxiliary_device *auxdev)
131 struct sof_client_dev *cdev = auxiliary_dev_to_sof_client_dev(auxdev);
132 struct sof_msg_inject_priv *priv = cdev->data;
134 pm_runtime_disable(&auxdev->dev);
136 debugfs_remove(priv->kernel_dfs_file);
139 static const struct auxiliary_device_id sof_msg_inject_client_id_table[] = {
140 { .name = "snd_sof.kernel_injector" },
143 MODULE_DEVICE_TABLE(auxiliary, sof_msg_inject_client_id_table);
146 * No need for driver pm_ops as the generic pm callbacks in the auxiliary bus
147 * type are enough to ensure that the parent SOF device resumes to bring the DSP
149 * Driver name will be set based on KBUILD_MODNAME.
151 static struct auxiliary_driver sof_msg_inject_client_drv = {
152 .probe = sof_msg_inject_probe,
153 .remove = sof_msg_inject_remove,
155 .id_table = sof_msg_inject_client_id_table,
158 module_auxiliary_driver(sof_msg_inject_client_drv);
160 MODULE_DESCRIPTION("SOF IPC Kernel Injector Client Driver");
161 MODULE_LICENSE("GPL");
162 MODULE_IMPORT_NS(SND_SOC_SOF_CLIENT);