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