1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
|
// 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);
pm_runtime_mark_last_busy(dev);
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");
|
