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376 lines
7.3 KiB
376 lines
7.3 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* |
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* Bluetooth virtual HCI driver |
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* |
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* Copyright (C) 2000-2001 Qualcomm Incorporated |
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* Copyright (C) 2002-2003 Maxim Krasnyansky <[email protected]> |
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* Copyright (C) 2004-2006 Marcel Holtmann <[email protected]> |
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*/ |
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#include <linux/module.h> |
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#include <asm/unaligned.h> |
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#include <linux/kernel.h> |
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#include <linux/init.h> |
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#include <linux/slab.h> |
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#include <linux/types.h> |
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#include <linux/errno.h> |
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#include <linux/sched.h> |
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#include <linux/poll.h> |
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#include <linux/skbuff.h> |
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#include <linux/miscdevice.h> |
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#include <net/bluetooth/bluetooth.h> |
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#include <net/bluetooth/hci_core.h> |
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#define VERSION "1.5" |
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static bool amp; |
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struct vhci_data { |
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struct hci_dev *hdev; |
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wait_queue_head_t read_wait; |
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struct sk_buff_head readq; |
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struct mutex open_mutex; |
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struct delayed_work open_timeout; |
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}; |
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static int vhci_open_dev(struct hci_dev *hdev) |
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{ |
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return 0; |
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} |
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static int vhci_close_dev(struct hci_dev *hdev) |
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{ |
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struct vhci_data *data = hci_get_drvdata(hdev); |
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skb_queue_purge(&data->readq); |
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return 0; |
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} |
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static int vhci_flush(struct hci_dev *hdev) |
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{ |
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struct vhci_data *data = hci_get_drvdata(hdev); |
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skb_queue_purge(&data->readq); |
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return 0; |
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} |
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static int vhci_send_frame(struct hci_dev *hdev, struct sk_buff *skb) |
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{ |
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struct vhci_data *data = hci_get_drvdata(hdev); |
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memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1); |
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skb_queue_tail(&data->readq, skb); |
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wake_up_interruptible(&data->read_wait); |
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return 0; |
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} |
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static int __vhci_create_device(struct vhci_data *data, __u8 opcode) |
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{ |
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struct hci_dev *hdev; |
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struct sk_buff *skb; |
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__u8 dev_type; |
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if (data->hdev) |
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return -EBADFD; |
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/* bits 0-1 are dev_type (Primary or AMP) */ |
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dev_type = opcode & 0x03; |
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if (dev_type != HCI_PRIMARY && dev_type != HCI_AMP) |
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return -EINVAL; |
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/* bits 2-5 are reserved (must be zero) */ |
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if (opcode & 0x3c) |
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return -EINVAL; |
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skb = bt_skb_alloc(4, GFP_KERNEL); |
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if (!skb) |
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return -ENOMEM; |
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hdev = hci_alloc_dev(); |
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if (!hdev) { |
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kfree_skb(skb); |
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return -ENOMEM; |
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} |
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data->hdev = hdev; |
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hdev->bus = HCI_VIRTUAL; |
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hdev->dev_type = dev_type; |
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hci_set_drvdata(hdev, data); |
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hdev->open = vhci_open_dev; |
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hdev->close = vhci_close_dev; |
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hdev->flush = vhci_flush; |
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hdev->send = vhci_send_frame; |
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/* bit 6 is for external configuration */ |
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if (opcode & 0x40) |
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set_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks); |
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/* bit 7 is for raw device */ |
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if (opcode & 0x80) |
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set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks); |
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if (hci_register_dev(hdev) < 0) { |
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BT_ERR("Can't register HCI device"); |
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hci_free_dev(hdev); |
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data->hdev = NULL; |
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kfree_skb(skb); |
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return -EBUSY; |
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} |
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hci_skb_pkt_type(skb) = HCI_VENDOR_PKT; |
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skb_put_u8(skb, 0xff); |
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skb_put_u8(skb, opcode); |
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put_unaligned_le16(hdev->id, skb_put(skb, 2)); |
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skb_queue_tail(&data->readq, skb); |
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wake_up_interruptible(&data->read_wait); |
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return 0; |
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} |
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static int vhci_create_device(struct vhci_data *data, __u8 opcode) |
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{ |
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int err; |
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mutex_lock(&data->open_mutex); |
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err = __vhci_create_device(data, opcode); |
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mutex_unlock(&data->open_mutex); |
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return err; |
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} |
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static inline ssize_t vhci_get_user(struct vhci_data *data, |
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struct iov_iter *from) |
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{ |
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size_t len = iov_iter_count(from); |
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struct sk_buff *skb; |
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__u8 pkt_type, opcode; |
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int ret; |
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if (len < 2 || len > HCI_MAX_FRAME_SIZE) |
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return -EINVAL; |
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skb = bt_skb_alloc(len, GFP_KERNEL); |
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if (!skb) |
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return -ENOMEM; |
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if (!copy_from_iter_full(skb_put(skb, len), len, from)) { |
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kfree_skb(skb); |
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return -EFAULT; |
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} |
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pkt_type = *((__u8 *) skb->data); |
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skb_pull(skb, 1); |
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switch (pkt_type) { |
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case HCI_EVENT_PKT: |
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case HCI_ACLDATA_PKT: |
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case HCI_SCODATA_PKT: |
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case HCI_ISODATA_PKT: |
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if (!data->hdev) { |
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kfree_skb(skb); |
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return -ENODEV; |
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} |
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hci_skb_pkt_type(skb) = pkt_type; |
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ret = hci_recv_frame(data->hdev, skb); |
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break; |
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case HCI_VENDOR_PKT: |
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cancel_delayed_work_sync(&data->open_timeout); |
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opcode = *((__u8 *) skb->data); |
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skb_pull(skb, 1); |
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if (skb->len > 0) { |
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kfree_skb(skb); |
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return -EINVAL; |
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} |
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kfree_skb(skb); |
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ret = vhci_create_device(data, opcode); |
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break; |
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default: |
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kfree_skb(skb); |
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return -EINVAL; |
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} |
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return (ret < 0) ? ret : len; |
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} |
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static inline ssize_t vhci_put_user(struct vhci_data *data, |
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struct sk_buff *skb, |
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char __user *buf, int count) |
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{ |
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char __user *ptr = buf; |
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int len; |
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len = min_t(unsigned int, skb->len, count); |
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if (copy_to_user(ptr, skb->data, len)) |
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return -EFAULT; |
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if (!data->hdev) |
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return len; |
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data->hdev->stat.byte_tx += len; |
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switch (hci_skb_pkt_type(skb)) { |
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case HCI_COMMAND_PKT: |
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data->hdev->stat.cmd_tx++; |
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break; |
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case HCI_ACLDATA_PKT: |
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data->hdev->stat.acl_tx++; |
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break; |
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case HCI_SCODATA_PKT: |
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data->hdev->stat.sco_tx++; |
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break; |
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} |
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return len; |
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} |
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static ssize_t vhci_read(struct file *file, |
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char __user *buf, size_t count, loff_t *pos) |
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{ |
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struct vhci_data *data = file->private_data; |
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struct sk_buff *skb; |
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ssize_t ret = 0; |
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while (count) { |
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skb = skb_dequeue(&data->readq); |
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if (skb) { |
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ret = vhci_put_user(data, skb, buf, count); |
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if (ret < 0) |
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skb_queue_head(&data->readq, skb); |
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else |
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kfree_skb(skb); |
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break; |
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} |
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if (file->f_flags & O_NONBLOCK) { |
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ret = -EAGAIN; |
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break; |
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} |
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ret = wait_event_interruptible(data->read_wait, |
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!skb_queue_empty(&data->readq)); |
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if (ret < 0) |
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break; |
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} |
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return ret; |
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} |
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static ssize_t vhci_write(struct kiocb *iocb, struct iov_iter *from) |
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{ |
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struct file *file = iocb->ki_filp; |
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struct vhci_data *data = file->private_data; |
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return vhci_get_user(data, from); |
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} |
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static __poll_t vhci_poll(struct file *file, poll_table *wait) |
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{ |
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struct vhci_data *data = file->private_data; |
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poll_wait(file, &data->read_wait, wait); |
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if (!skb_queue_empty(&data->readq)) |
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return EPOLLIN | EPOLLRDNORM; |
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return EPOLLOUT | EPOLLWRNORM; |
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} |
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static void vhci_open_timeout(struct work_struct *work) |
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{ |
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struct vhci_data *data = container_of(work, struct vhci_data, |
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open_timeout.work); |
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vhci_create_device(data, amp ? HCI_AMP : HCI_PRIMARY); |
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} |
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static int vhci_open(struct inode *inode, struct file *file) |
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{ |
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struct vhci_data *data; |
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data = kzalloc(sizeof(struct vhci_data), GFP_KERNEL); |
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if (!data) |
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return -ENOMEM; |
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skb_queue_head_init(&data->readq); |
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init_waitqueue_head(&data->read_wait); |
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mutex_init(&data->open_mutex); |
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INIT_DELAYED_WORK(&data->open_timeout, vhci_open_timeout); |
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file->private_data = data; |
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nonseekable_open(inode, file); |
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schedule_delayed_work(&data->open_timeout, msecs_to_jiffies(1000)); |
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return 0; |
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} |
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static int vhci_release(struct inode *inode, struct file *file) |
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{ |
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struct vhci_data *data = file->private_data; |
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struct hci_dev *hdev; |
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cancel_delayed_work_sync(&data->open_timeout); |
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hdev = data->hdev; |
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if (hdev) { |
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hci_unregister_dev(hdev); |
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hci_free_dev(hdev); |
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} |
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skb_queue_purge(&data->readq); |
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file->private_data = NULL; |
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kfree(data); |
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return 0; |
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} |
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static const struct file_operations vhci_fops = { |
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.owner = THIS_MODULE, |
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.read = vhci_read, |
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.write_iter = vhci_write, |
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.poll = vhci_poll, |
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.open = vhci_open, |
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.release = vhci_release, |
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.llseek = no_llseek, |
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}; |
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static struct miscdevice vhci_miscdev = { |
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.name = "vhci", |
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.fops = &vhci_fops, |
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.minor = VHCI_MINOR, |
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}; |
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module_misc_device(vhci_miscdev); |
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module_param(amp, bool, 0644); |
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MODULE_PARM_DESC(amp, "Create AMP controller device"); |
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MODULE_AUTHOR("Marcel Holtmann <[email protected]>"); |
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MODULE_DESCRIPTION("Bluetooth virtual HCI driver ver " VERSION); |
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MODULE_VERSION(VERSION); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS("devname:vhci"); |
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MODULE_ALIAS_MISCDEV(VHCI_MINOR);
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