Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Arnaud Pouliquen | 1011 | 100.00% | 3 | 100.00% |
Total | 1011 | 3 |
// 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");
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