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