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