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183 lines
5.0 KiB
183 lines
5.0 KiB
/* |
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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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