diff options
Diffstat (limited to 'sound/soc/sof/sof-client-ipc-kernel-injector.c')
| -rw-r--r-- | sound/soc/sof/sof-client-ipc-kernel-injector.c | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/sound/soc/sof/sof-client-ipc-kernel-injector.c b/sound/soc/sof/sof-client-ipc-kernel-injector.c new file mode 100644 index 0000000000..ad0ed2d570 --- /dev/null +++ b/sound/soc/sof/sof-client-ipc-kernel-injector.c @@ -0,0 +1,162 @@ +// SPDX-License-Identifier: GPL-2.0-only +// +// Copyright(c) 2023 Google Inc. All rights reserved. +// +// 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_DESCRIPTION("SOF IPC Kernel Injector Client Driver"); +MODULE_LICENSE("GPL"); +MODULE_IMPORT_NS(SND_SOC_SOF_CLIENT); |