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/device.h> 8 #include <linux/fs.h> 9 10 #include "hfi.h" 11 #include "device.h" 12 13 static char *hfi1_devnode(const struct device *dev, umode_t *mode) 14 { 15 if (mode) 16 *mode = 0600; 17 return kasprintf(GFP_KERNEL, "%s", dev_name(dev)); 18 } 19 20 static const struct class class = { 21 .name = "hfi1", 22 .devnode = hfi1_devnode, 23 }; 24 25 static char *hfi1_user_devnode(const struct device *dev, umode_t *mode) 26 { 27 if (mode) 28 *mode = 0666; 29 return kasprintf(GFP_KERNEL, "%s", dev_name(dev)); 30 } 31 32 static const struct class user_class = { 33 .name = "hfi1_user", 34 .devnode = hfi1_user_devnode, 35 }; 36 static dev_t hfi1_dev; 37 38 int hfi1_cdev_init(int minor, const char *name, 39 const struct file_operations *fops, 40 struct cdev *cdev, struct device **devp, 41 bool user_accessible, 42 struct kobject *parent) 43 { 44 const dev_t dev = MKDEV(MAJOR(hfi1_dev), minor); 45 struct device *device = NULL; 46 int ret; 47 48 cdev_init(cdev, fops); 49 cdev->owner = THIS_MODULE; 50 cdev_set_parent(cdev, parent); 51 kobject_set_name(&cdev->kobj, name); 52 53 ret = cdev_add(cdev, dev, 1); 54 if (ret < 0) { 55 pr_err("Could not add cdev for minor %d, %s (err %d)\n", 56 minor, name, -ret); 57 goto done; 58 } 59 60 if (user_accessible) 61 device = device_create(&user_class, NULL, dev, NULL, "%s", name); 62 else 63 device = device_create(&class, NULL, dev, NULL, "%s", name); 64 65 if (IS_ERR(device)) { 66 ret = PTR_ERR(device); 67 device = NULL; 68 pr_err("Could not create device for minor %d, %s (err %d)\n", 69 minor, name, -ret); 70 cdev_del(cdev); 71 } 72 done: 73 *devp = device; 74 return ret; 75 } 76 77 void hfi1_cdev_cleanup(struct cdev *cdev, struct device **devp) 78 { 79 struct device *device = *devp; 80 81 if (device) { 82 device_unregister(device); 83 *devp = NULL; 84 85 cdev_del(cdev); 86 } 87 } 88 89 static const char *hfi1_class_name = "hfi1"; 90 91 const char *class_name(void) 92 { 93 return hfi1_class_name; 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 ret = class_register(&class); 107 if (ret) { 108 pr_err("Could not create device class (err %d)\n", -ret); 109 unregister_chrdev_region(hfi1_dev, HFI1_NMINORS); 110 goto done; 111 } 112 113 ret = class_register(&user_class); 114 if (ret) { 115 pr_err("Could not create device class for user accessible files (err %d)\n", 116 -ret); 117 class_unregister(&class); 118 unregister_chrdev_region(hfi1_dev, HFI1_NMINORS); 119 goto done; 120 } 121 122 done: 123 return ret; 124 } 125 126 void dev_cleanup(void) 127 { 128 class_unregister(&class); 129 class_unregister(&user_class); 130 131 unregister_chrdev_region(hfi1_dev, HFI1_NMINORS); 132 } 133