Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Bongsu Jeon | 828 | 97.87% | 2 | 33.33% |
Shang XiaoJing | 15 | 1.77% | 1 | 16.67% |
Krzysztof Kozlowski | 2 | 0.24% | 2 | 33.33% |
Thadeu Lima de Souza Cascardo | 1 | 0.12% | 1 | 16.67% |
Total | 846 | 6 |
// SPDX-License-Identifier: GPL-2.0-or-later /* * Virtual NCI device simulation driver * * Copyright (C) 2020 Samsung Electrnoics * Bongsu Jeon <bongsu.jeon@samsung.com> */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/miscdevice.h> #include <linux/mutex.h> #include <linux/wait.h> #include <net/nfc/nci_core.h> enum virtual_ncidev_mode { virtual_ncidev_enabled, virtual_ncidev_disabled, virtual_ncidev_disabling, }; #define IOCTL_GET_NCIDEV_IDX 0 #define VIRTUAL_NFC_PROTOCOLS (NFC_PROTO_JEWEL_MASK | \ NFC_PROTO_MIFARE_MASK | \ NFC_PROTO_FELICA_MASK | \ NFC_PROTO_ISO14443_MASK | \ NFC_PROTO_ISO14443_B_MASK | \ NFC_PROTO_ISO15693_MASK) static enum virtual_ncidev_mode state; static DECLARE_WAIT_QUEUE_HEAD(wq); static struct miscdevice miscdev; static struct sk_buff *send_buff; static struct nci_dev *ndev; static DEFINE_MUTEX(nci_mutex); static int virtual_nci_open(struct nci_dev *ndev) { return 0; } static int virtual_nci_close(struct nci_dev *ndev) { mutex_lock(&nci_mutex); kfree_skb(send_buff); send_buff = NULL; mutex_unlock(&nci_mutex); return 0; } static int virtual_nci_send(struct nci_dev *ndev, struct sk_buff *skb) { mutex_lock(&nci_mutex); if (state != virtual_ncidev_enabled) { mutex_unlock(&nci_mutex); kfree_skb(skb); return 0; } if (send_buff) { mutex_unlock(&nci_mutex); kfree_skb(skb); return -1; } send_buff = skb_copy(skb, GFP_KERNEL); mutex_unlock(&nci_mutex); wake_up_interruptible(&wq); consume_skb(skb); return 0; } static const struct nci_ops virtual_nci_ops = { .open = virtual_nci_open, .close = virtual_nci_close, .send = virtual_nci_send }; static ssize_t virtual_ncidev_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) { size_t actual_len; mutex_lock(&nci_mutex); while (!send_buff) { mutex_unlock(&nci_mutex); if (wait_event_interruptible(wq, send_buff)) return -EFAULT; mutex_lock(&nci_mutex); } actual_len = min_t(size_t, count, send_buff->len); if (copy_to_user(buf, send_buff->data, actual_len)) { mutex_unlock(&nci_mutex); return -EFAULT; } skb_pull(send_buff, actual_len); if (send_buff->len == 0) { consume_skb(send_buff); send_buff = NULL; } mutex_unlock(&nci_mutex); return actual_len; } static ssize_t virtual_ncidev_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { struct sk_buff *skb; skb = alloc_skb(count, GFP_KERNEL); if (!skb) return -ENOMEM; if (copy_from_user(skb_put(skb, count), buf, count)) { kfree_skb(skb); return -EFAULT; } nci_recv_frame(ndev, skb); return count; } static int virtual_ncidev_open(struct inode *inode, struct file *file) { int ret = 0; mutex_lock(&nci_mutex); if (state != virtual_ncidev_disabled) { mutex_unlock(&nci_mutex); return -EBUSY; } ndev = nci_allocate_device(&virtual_nci_ops, VIRTUAL_NFC_PROTOCOLS, 0, 0); if (!ndev) { mutex_unlock(&nci_mutex); return -ENOMEM; } ret = nci_register_device(ndev); if (ret < 0) { nci_free_device(ndev); mutex_unlock(&nci_mutex); return ret; } state = virtual_ncidev_enabled; mutex_unlock(&nci_mutex); return 0; } static int virtual_ncidev_close(struct inode *inode, struct file *file) { mutex_lock(&nci_mutex); if (state == virtual_ncidev_enabled) { state = virtual_ncidev_disabling; mutex_unlock(&nci_mutex); nci_unregister_device(ndev); nci_free_device(ndev); mutex_lock(&nci_mutex); } state = virtual_ncidev_disabled; mutex_unlock(&nci_mutex); return 0; } static long virtual_ncidev_ioctl(struct file *flip, unsigned int cmd, unsigned long arg) { const struct nfc_dev *nfc_dev = ndev->nfc_dev; void __user *p = (void __user *)arg; if (cmd != IOCTL_GET_NCIDEV_IDX) return -ENOTTY; if (copy_to_user(p, &nfc_dev->idx, sizeof(nfc_dev->idx))) return -EFAULT; return 0; } static const struct file_operations virtual_ncidev_fops = { .owner = THIS_MODULE, .read = virtual_ncidev_read, .write = virtual_ncidev_write, .open = virtual_ncidev_open, .release = virtual_ncidev_close, .unlocked_ioctl = virtual_ncidev_ioctl }; static int __init virtual_ncidev_init(void) { state = virtual_ncidev_disabled; miscdev.minor = MISC_DYNAMIC_MINOR; miscdev.name = "virtual_nci"; miscdev.fops = &virtual_ncidev_fops; miscdev.mode = 0600; return misc_register(&miscdev); } static void __exit virtual_ncidev_exit(void) { misc_deregister(&miscdev); } module_init(virtual_ncidev_init); module_exit(virtual_ncidev_exit); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Virtual NCI device simulation driver"); MODULE_AUTHOR("Bongsu Jeon <bongsu.jeon@samsung.com>");
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