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- // SPDX-License-Identifier: GPL-2.0
- /*
- * Copyright (C) 2022, STMicroelectronics
- * Copyright (c) 2016, Linaro Ltd.
- * Copyright (c) 2012, Michal Simek <[email protected]>
- * 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");
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