193 lines
4.9 KiB
C
193 lines
4.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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//
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// Copyright(c) 2022 Intel Corporation. All rights reserved.
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//
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// Author: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
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//
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#include <linux/auxiliary_bus.h>
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#include <linux/completion.h>
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#include <linux/debugfs.h>
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#include <linux/ktime.h>
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#include <linux/mod_devicetable.h>
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#include <linux/module.h>
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#include <linux/pm_runtime.h>
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#include <linux/slab.h>
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#include <linux/uaccess.h>
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#include <sound/sof/header.h>
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#include "sof-client.h"
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#define SOF_IPC_CLIENT_SUSPEND_DELAY_MS 3000
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struct sof_msg_inject_priv {
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struct dentry *dfs_file;
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void *tx_buffer;
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void *rx_buffer;
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};
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static int sof_msg_inject_dfs_open(struct inode *inode, struct file *file)
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{
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struct sof_client_dev *cdev = inode->i_private;
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int ret;
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if (sof_client_get_fw_state(cdev) == SOF_FW_CRASHED)
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return -ENODEV;
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ret = debugfs_file_get(file->f_path.dentry);
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if (unlikely(ret))
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return ret;
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ret = simple_open(inode, file);
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if (ret)
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debugfs_file_put(file->f_path.dentry);
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return ret;
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}
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static ssize_t sof_msg_inject_dfs_read(struct file *file, char __user *buffer,
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size_t count, loff_t *ppos)
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{
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struct sof_client_dev *cdev = file->private_data;
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struct sof_msg_inject_priv *priv = cdev->data;
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struct sof_ipc_reply *rhdr = priv->rx_buffer;
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if (!rhdr->hdr.size || !count || *ppos)
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return 0;
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if (count > rhdr->hdr.size)
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count = rhdr->hdr.size;
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if (copy_to_user(buffer, priv->rx_buffer, count))
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return -EFAULT;
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*ppos += count;
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return count;
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}
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static ssize_t sof_msg_inject_dfs_write(struct file *file, const char __user *buffer,
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size_t count, loff_t *ppos)
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{
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struct sof_client_dev *cdev = file->private_data;
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struct sof_msg_inject_priv *priv = cdev->data;
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struct device *dev = &cdev->auxdev.dev;
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int ret, err;
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size_t size;
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if (*ppos)
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return 0;
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size = simple_write_to_buffer(priv->tx_buffer, SOF_IPC_MSG_MAX_SIZE,
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ppos, buffer, count);
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if (size != count)
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return size > 0 ? -EFAULT : size;
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ret = pm_runtime_get_sync(dev);
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if (ret < 0 && ret != -EACCES) {
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dev_err_ratelimited(dev, "debugfs write failed to resume %d\n", ret);
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pm_runtime_put_noidle(dev);
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return ret;
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}
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/* send the message */
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memset(priv->rx_buffer, 0, SOF_IPC_MSG_MAX_SIZE);
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ret = sof_client_ipc_tx_message(cdev, priv->tx_buffer, priv->rx_buffer,
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SOF_IPC_MSG_MAX_SIZE);
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pm_runtime_mark_last_busy(dev);
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err = pm_runtime_put_autosuspend(dev);
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if (err < 0)
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dev_err_ratelimited(dev, "debugfs write failed to idle %d\n", err);
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/* return size if test is successful */
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if (ret >= 0)
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ret = size;
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return ret;
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};
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static int sof_msg_inject_dfs_release(struct inode *inode, struct file *file)
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{
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debugfs_file_put(file->f_path.dentry);
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return 0;
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}
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static const struct file_operations sof_msg_inject_fops = {
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.open = sof_msg_inject_dfs_open,
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.read = sof_msg_inject_dfs_read,
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.write = sof_msg_inject_dfs_write,
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.llseek = default_llseek,
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.release = sof_msg_inject_dfs_release,
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.owner = THIS_MODULE,
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};
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static int sof_msg_inject_probe(struct auxiliary_device *auxdev,
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const struct auxiliary_device_id *id)
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{
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struct sof_client_dev *cdev = auxiliary_dev_to_sof_client_dev(auxdev);
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struct dentry *debugfs_root = sof_client_get_debugfs_root(cdev);
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struct device *dev = &auxdev->dev;
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struct sof_msg_inject_priv *priv;
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/* allocate memory for client data */
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priv = devm_kzalloc(&auxdev->dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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priv->tx_buffer = devm_kmalloc(dev, SOF_IPC_MSG_MAX_SIZE, GFP_KERNEL);
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priv->rx_buffer = devm_kzalloc(dev, SOF_IPC_MSG_MAX_SIZE, GFP_KERNEL);
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if (!priv->tx_buffer || !priv->rx_buffer)
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return -ENOMEM;
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cdev->data = priv;
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priv->dfs_file = debugfs_create_file("ipc_msg_inject", 0644, debugfs_root,
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cdev, &sof_msg_inject_fops);
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/* enable runtime PM */
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pm_runtime_set_autosuspend_delay(dev, SOF_IPC_CLIENT_SUSPEND_DELAY_MS);
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pm_runtime_use_autosuspend(dev);
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pm_runtime_enable(dev);
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pm_runtime_mark_last_busy(dev);
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pm_runtime_idle(dev);
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return 0;
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}
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static void sof_msg_inject_remove(struct auxiliary_device *auxdev)
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{
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struct sof_client_dev *cdev = auxiliary_dev_to_sof_client_dev(auxdev);
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struct sof_msg_inject_priv *priv = cdev->data;
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pm_runtime_disable(&auxdev->dev);
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debugfs_remove(priv->dfs_file);
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}
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static const struct auxiliary_device_id sof_msg_inject_client_id_table[] = {
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{ .name = "snd_sof.msg_injector" },
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{},
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};
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MODULE_DEVICE_TABLE(auxiliary, sof_msg_inject_client_id_table);
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/*
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* No need for driver pm_ops as the generic pm callbacks in the auxiliary bus
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* type are enough to ensure that the parent SOF device resumes to bring the DSP
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* back to D0.
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* Driver name will be set based on KBUILD_MODNAME.
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*/
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static struct auxiliary_driver sof_msg_inject_client_drv = {
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.probe = sof_msg_inject_probe,
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.remove = sof_msg_inject_remove,
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.id_table = sof_msg_inject_client_id_table,
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};
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module_auxiliary_driver(sof_msg_inject_client_drv);
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MODULE_DESCRIPTION("SOF IPC Message Injector Client Driver");
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MODULE_LICENSE("GPL");
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MODULE_IMPORT_NS(SND_SOC_SOF_CLIENT);
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