// SPDX-License-Identifier: GPL-2.0/* * Copyright (C) 2022, STMicroelectronics * Copyright (c) 2016, Linaro Ltd. * Copyright (c) 2012, Michal Simek <monstr@monstr.eu> * Copyright (c) 2012, PetaLogix * Copyright (c) 2011, Texas Instruments, Inc. * Copyright (c) 2011, Google, Inc. * * Based on rpmsg performance statistics driver by Michal Simek, which in turn * was based on TI & Google OMX rpmsg driver. */ #define pr_fmt(fmt)		KBUILD_MODNAME ": " fmt #include <linux/cdev.h>#include <linux/device.h>#include <linux/fs.h>#include <linux/idr.h>#include <linux/kernel.h>#include <linux/module.h>#include <linux/rpmsg.h>#include <linux/skbuff.h>#include <linux/slab.h>#include <linux/uaccess.h>#include <uapi/linux/rpmsg.h> #include "rpmsg_char.h"#include "rpmsg_internal.h" #define RPMSG_DEV_MAX	(MINORMASK + 1) static dev_t rpmsg_major; static DEFINE_IDA(rpmsg_ctrl_ida);static DEFINE_IDA(rpmsg_minor_ida); #define dev_to_ctrldev(dev) container_of(dev, struct rpmsg_ctrldev, dev)#define cdev_to_ctrldev(i_cdev) container_of(i_cdev, struct rpmsg_ctrldev, cdev) /** * struct rpmsg_ctrldev - control device for instantiating endpoint devices * @rpdev:	underlaying rpmsg device * @cdev:	cdev for the ctrl device * @dev:	device for the ctrl device * @ctrl_lock:	serialize the ioctrls. */struct rpmsg_ctrldev {	struct rpmsg_device *rpdev;	struct cdev cdev;	struct device dev;	struct mutex ctrl_lock;}; static int rpmsg_ctrldev_open(struct inode *inode, struct file *filp){	struct rpmsg_ctrldev *ctrldev = cdev_to_ctrldev(inode->i_cdev); 	get_device(&ctrldev->dev);	filp->private_data = ctrldev; 	return 0;} static int rpmsg_ctrldev_release(struct inode *inode, struct file *filp){	struct rpmsg_ctrldev *ctrldev = cdev_to_ctrldev(inode->i_cdev); 	put_device(&ctrldev->dev); 	return 0;} static long rpmsg_ctrldev_ioctl(struct file *fp, unsigned int cmd,				unsigned long arg){	struct rpmsg_ctrldev *ctrldev = fp->private_data;	void __user *argp = (void __user *)arg;	struct rpmsg_endpoint_info eptinfo;	struct rpmsg_channel_info chinfo;	struct rpmsg_device *rpdev;	int ret = 0; 	if (copy_from_user(&eptinfo, argp, sizeof(eptinfo)))		return -EFAULT; 	memcpy(chinfo.name, eptinfo.name, RPMSG_NAME_SIZE);	chinfo.name[RPMSG_NAME_SIZE - 1] = '\0';	chinfo.src = eptinfo.src;	chinfo.dst = eptinfo.dst; 	mutex_lock(&ctrldev->ctrl_lock);	switch (cmd) {	case RPMSG_CREATE_EPT_IOCTL:		ret = rpmsg_chrdev_eptdev_create(ctrldev->rpdev, &ctrldev->dev, chinfo);		break; 	case RPMSG_CREATE_DEV_IOCTL:		rpdev = rpmsg_create_channel(ctrldev->rpdev, &chinfo);		if (!rpdev) {			dev_err(&ctrldev->dev, "failed to create %s channel\n", chinfo.name);			ret = -ENXIO;		}		break; 	case RPMSG_RELEASE_DEV_IOCTL:		ret = rpmsg_release_channel(ctrldev->rpdev, &chinfo);		if (ret)			dev_err(&ctrldev->dev, "failed to release %s channel (%d)\n",				chinfo.name, ret);		break; 	default:		ret = -EINVAL;	}	mutex_unlock(&ctrldev->ctrl_lock); 	return ret;}; static const struct file_operations rpmsg_ctrldev_fops = {	.owner = THIS_MODULE,	.open = rpmsg_ctrldev_open,	.release = rpmsg_ctrldev_release,	.unlocked_ioctl = rpmsg_ctrldev_ioctl,	.compat_ioctl = compat_ptr_ioctl,}; static void rpmsg_ctrldev_release_device(struct device *dev){	struct rpmsg_ctrldev *ctrldev = dev_to_ctrldev(dev); 	ida_simple_remove(&rpmsg_ctrl_ida, dev->id);	ida_simple_remove(&rpmsg_minor_ida, MINOR(dev->devt));	kfree(ctrldev);} static int rpmsg_ctrldev_probe(struct rpmsg_device *rpdev){	struct rpmsg_ctrldev *ctrldev;	struct device *dev;	int ret; 	ctrldev = kzalloc(sizeof(*ctrldev), GFP_KERNEL);	if (!ctrldev)		return -ENOMEM; 	ctrldev->rpdev = rpdev; 	dev = &ctrldev->dev;	device_initialize(dev);	dev->parent = &rpdev->dev;	dev->class = rpmsg_class; 	mutex_init(&ctrldev->ctrl_lock);	cdev_init(&ctrldev->cdev, &rpmsg_ctrldev_fops);	ctrldev->cdev.owner = THIS_MODULE; 	ret = ida_simple_get(&rpmsg_minor_ida, 0, RPMSG_DEV_MAX, GFP_KERNEL);	if (ret < 0)		goto free_ctrldev;	dev->devt = MKDEV(MAJOR(rpmsg_major), ret); 	ret = ida_simple_get(&rpmsg_ctrl_ida, 0, 0, GFP_KERNEL);	if (ret < 0)		goto free_minor_ida;	dev->id = ret;	dev_set_name(&ctrldev->dev, "rpmsg_ctrl%d", ret); 	ret = cdev_device_add(&ctrldev->cdev, &ctrldev->dev);	if (ret)		goto free_ctrl_ida; 	/* We can now rely on the release function for cleanup */	dev->release = rpmsg_ctrldev_release_device; 	dev_set_drvdata(&rpdev->dev, ctrldev); 	return ret; free_ctrl_ida:	ida_simple_remove(&rpmsg_ctrl_ida, dev->id);free_minor_ida:	ida_simple_remove(&rpmsg_minor_ida, MINOR(dev->devt));free_ctrldev:	put_device(dev);	kfree(ctrldev); 	return ret;} static void rpmsg_ctrldev_remove(struct rpmsg_device *rpdev){	struct rpmsg_ctrldev *ctrldev = dev_get_drvdata(&rpdev->dev);	int ret; 	/* Destroy all endpoints */	ret = device_for_each_child(&ctrldev->dev, NULL, rpmsg_chrdev_eptdev_destroy);	if (ret)		dev_warn(&rpdev->dev, "failed to nuke endpoints: %d\n", ret); 	cdev_device_del(&ctrldev->cdev, &ctrldev->dev);	put_device(&ctrldev->dev);} static struct rpmsg_driver rpmsg_ctrldev_driver = {	.probe = rpmsg_ctrldev_probe,	.remove = rpmsg_ctrldev_remove,	.drv = {		.name = "rpmsg_ctrl",	},}; static int rpmsg_ctrldev_init(void){	int ret; 	ret = alloc_chrdev_region(&rpmsg_major, 0, RPMSG_DEV_MAX, "rpmsg_ctrl");	if (ret < 0) {		pr_err("failed to allocate char dev region\n");		return ret;	} 	ret = register_rpmsg_driver(&rpmsg_ctrldev_driver);	if (ret < 0) {		pr_err("failed to register rpmsg driver\n");		unregister_chrdev_region(rpmsg_major, RPMSG_DEV_MAX);	} 	return ret;}postcore_initcall(rpmsg_ctrldev_init); static void rpmsg_ctrldev_exit(void){	unregister_rpmsg_driver(&rpmsg_ctrldev_driver);	unregister_chrdev_region(rpmsg_major, RPMSG_DEV_MAX);}module_exit(rpmsg_ctrldev_exit); MODULE_DESCRIPTION("rpmsg control interface");MODULE_ALIAS("rpmsg:" KBUILD_MODNAME);MODULE_LICENSE("GPL v2");