1 // SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause 2 /* 3 * Copyright(c) 2015, 2016 Intel Corporation. 4 */ 5 6 #include <linux/cdev.h> 7 #include <linux/module.h> 8 #include <linux/device.h> 9 #include <linux/fs.h> 10 11 #include "hfi.h" 12 #include "device.h" 13 14 static struct class *class; 15 static struct class *user_class; 16 static dev_t hfi1_dev; 17 18 int hfi1_cdev_init(int minor, const char *name, 19 const struct file_operations *fops, 20 struct cdev *cdev, struct device **devp, 21 bool user_accessible, 22 struct kobject *parent) 23 { 24 const dev_t dev = MKDEV(MAJOR(hfi1_dev), minor); 25 struct device *device = NULL; 26 int ret; 27 28 cdev_init(cdev, fops); 29 cdev->owner = THIS_MODULE; 30 cdev_set_parent(cdev, parent); 31 kobject_set_name(&cdev->kobj, name); 32 33 ret = cdev_add(cdev, dev, 1); 34 if (ret < 0) { 35 pr_err("Could not add cdev for minor %d, %s (err %d)\n", 36 minor, name, -ret); 37 goto done; 38 } 39 40 if (user_accessible) 41 device = device_create(user_class, NULL, dev, NULL, "%s", name); 42 else 43 device = device_create(class, NULL, dev, NULL, "%s", name); 44 45 if (IS_ERR(device)) { 46 ret = PTR_ERR(device); 47 device = NULL; 48 pr_err("Could not create device for minor %d, %s (err %d)\n", 49 minor, name, -ret); 50 cdev_del(cdev); 51 } 52 done: 53 *devp = device; 54 return ret; 55 } 56 57 void hfi1_cdev_cleanup(struct cdev *cdev, struct device **devp) 58 { 59 struct device *device = *devp; 60 61 if (device) { 62 device_unregister(device); 63 *devp = NULL; 64 65 cdev_del(cdev); 66 } 67 } 68 69 static const char *hfi1_class_name = "hfi1"; 70 71 const char *class_name(void) 72 { 73 return hfi1_class_name; 74 } 75 76 static char *hfi1_devnode(struct device *dev, umode_t *mode) 77 { 78 if (mode) 79 *mode = 0600; 80 return kasprintf(GFP_KERNEL, "%s", dev_name(dev)); 81 } 82 83 static const char *hfi1_class_name_user = "hfi1_user"; 84 static const char *class_name_user(void) 85 { 86 return hfi1_class_name_user; 87 } 88 89 static char *hfi1_user_devnode(struct device *dev, umode_t *mode) 90 { 91 if (mode) 92 *mode = 0666; 93 return kasprintf(GFP_KERNEL, "%s", dev_name(dev)); 94 } 95 96 int __init dev_init(void) 97 { 98 int ret; 99 100 ret = alloc_chrdev_region(&hfi1_dev, 0, HFI1_NMINORS, DRIVER_NAME); 101 if (ret < 0) { 102 pr_err("Could not allocate chrdev region (err %d)\n", -ret); 103 goto done; 104 } 105 106 class = class_create(THIS_MODULE, class_name()); 107 if (IS_ERR(class)) { 108 ret = PTR_ERR(class); 109 pr_err("Could not create device class (err %d)\n", -ret); 110 unregister_chrdev_region(hfi1_dev, HFI1_NMINORS); 111 goto done; 112 } 113 class->devnode = hfi1_devnode; 114 115 user_class = class_create(THIS_MODULE, class_name_user()); 116 if (IS_ERR(user_class)) { 117 ret = PTR_ERR(user_class); 118 pr_err("Could not create device class for user accessible files (err %d)\n", 119 -ret); 120 class_destroy(class); 121 class = NULL; 122 user_class = NULL; 123 unregister_chrdev_region(hfi1_dev, HFI1_NMINORS); 124 goto done; 125 } 126 user_class->devnode = hfi1_user_devnode; 127 128 done: 129 return ret; 130 } 131 132 void dev_cleanup(void) 133 { 134 class_destroy(class); 135 class = NULL; 136 137 class_destroy(user_class); 138 user_class = NULL; 139 140 unregister_chrdev_region(hfi1_dev, HFI1_NMINORS); 141 } 142