142 lines
2.9 KiB
C
142 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause
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/*
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* Copyright(c) 2015, 2016 Intel Corporation.
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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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