184 lines
5 KiB
C
184 lines
5 KiB
C
/*
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* Copyright(c) 2015, 2016 Intel Corporation.
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*
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* This file is provided under a dual BSD/GPLv2 license. When using or
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* redistributing this file, you may do so under either license.
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*
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* GPL LICENSE SUMMARY
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* BSD LICENSE
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* - Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include <linux/cdev.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/fs.h>
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#include "hfi.h"
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#include "device.h"
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static struct class *class;
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static struct class *user_class;
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static dev_t hfi1_dev;
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int hfi1_cdev_init(int minor, const char *name,
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const struct file_operations *fops,
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struct cdev *cdev, struct device **devp,
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bool user_accessible,
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struct kobject *parent)
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{
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const dev_t dev = MKDEV(MAJOR(hfi1_dev), minor);
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struct device *device = NULL;
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int ret;
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cdev_init(cdev, fops);
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cdev->owner = THIS_MODULE;
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cdev_set_parent(cdev, parent);
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kobject_set_name(&cdev->kobj, name);
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ret = cdev_add(cdev, dev, 1);
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if (ret < 0) {
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pr_err("Could not add cdev for minor %d, %s (err %d)\n",
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minor, name, -ret);
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goto done;
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}
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if (user_accessible)
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device = device_create(user_class, NULL, dev, NULL, "%s", name);
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else
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device = device_create(class, NULL, dev, NULL, "%s", name);
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if (IS_ERR(device)) {
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ret = PTR_ERR(device);
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device = NULL;
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pr_err("Could not create device for minor %d, %s (err %d)\n",
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minor, name, -ret);
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cdev_del(cdev);
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}
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done:
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*devp = device;
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return ret;
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}
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void hfi1_cdev_cleanup(struct cdev *cdev, struct device **devp)
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{
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struct device *device = *devp;
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if (device) {
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device_unregister(device);
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*devp = NULL;
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cdev_del(cdev);
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}
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}
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static const char *hfi1_class_name = "hfi1";
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const char *class_name(void)
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{
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return hfi1_class_name;
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}
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static char *hfi1_devnode(struct device *dev, umode_t *mode)
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{
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if (mode)
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*mode = 0600;
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return kasprintf(GFP_KERNEL, "%s", dev_name(dev));
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}
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static const char *hfi1_class_name_user = "hfi1_user";
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static const char *class_name_user(void)
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{
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return hfi1_class_name_user;
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}
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static char *hfi1_user_devnode(struct device *dev, umode_t *mode)
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{
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if (mode)
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*mode = 0666;
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return kasprintf(GFP_KERNEL, "%s", dev_name(dev));
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}
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int __init dev_init(void)
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{
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int ret;
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ret = alloc_chrdev_region(&hfi1_dev, 0, HFI1_NMINORS, DRIVER_NAME);
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if (ret < 0) {
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pr_err("Could not allocate chrdev region (err %d)\n", -ret);
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goto done;
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}
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class = class_create(THIS_MODULE, class_name());
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if (IS_ERR(class)) {
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ret = PTR_ERR(class);
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pr_err("Could not create device class (err %d)\n", -ret);
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unregister_chrdev_region(hfi1_dev, HFI1_NMINORS);
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goto done;
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}
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class->devnode = hfi1_devnode;
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user_class = class_create(THIS_MODULE, class_name_user());
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if (IS_ERR(user_class)) {
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ret = PTR_ERR(user_class);
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pr_err("Could not create device class for user accessible files (err %d)\n",
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-ret);
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class_destroy(class);
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class = NULL;
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user_class = NULL;
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unregister_chrdev_region(hfi1_dev, HFI1_NMINORS);
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goto done;
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}
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user_class->devnode = hfi1_user_devnode;
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done:
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return ret;
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}
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void dev_cleanup(void)
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{
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class_destroy(class);
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class = NULL;
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class_destroy(user_class);
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user_class = NULL;
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unregister_chrdev_region(hfi1_dev, HFI1_NMINORS);
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}
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