| /* |
| * |
| * Bluetooth virtual HCI driver |
| * |
| * Copyright (C) 2000-2001 Qualcomm Incorporated |
| * Copyright (C) 2002-2003 Maxim Krasnyansky <maxk@qualcomm.com> |
| * Copyright (C) 2004-2006 Marcel Holtmann <marcel@holtmann.org> |
| * |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| * |
| */ |
| |
| #include <linux/module.h> |
| #include <asm/unaligned.h> |
| |
| #include <linux/kernel.h> |
| #include <linux/init.h> |
| #include <linux/slab.h> |
| #include <linux/types.h> |
| #include <linux/errno.h> |
| #include <linux/sched.h> |
| #include <linux/poll.h> |
| |
| #include <linux/skbuff.h> |
| #include <linux/miscdevice.h> |
| |
| #include <net/bluetooth/bluetooth.h> |
| #include <net/bluetooth/hci_core.h> |
| |
| #define VERSION "1.5" |
| |
| static bool amp; |
| |
| struct vhci_data { |
| struct hci_dev *hdev; |
| |
| wait_queue_head_t read_wait; |
| struct sk_buff_head readq; |
| |
| struct mutex open_mutex; |
| struct delayed_work open_timeout; |
| }; |
| |
| static int vhci_open_dev(struct hci_dev *hdev) |
| { |
| return 0; |
| } |
| |
| static int vhci_close_dev(struct hci_dev *hdev) |
| { |
| struct vhci_data *data = hci_get_drvdata(hdev); |
| |
| skb_queue_purge(&data->readq); |
| |
| return 0; |
| } |
| |
| static int vhci_flush(struct hci_dev *hdev) |
| { |
| struct vhci_data *data = hci_get_drvdata(hdev); |
| |
| skb_queue_purge(&data->readq); |
| |
| return 0; |
| } |
| |
| static int vhci_send_frame(struct hci_dev *hdev, struct sk_buff *skb) |
| { |
| struct vhci_data *data = hci_get_drvdata(hdev); |
| |
| memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1); |
| skb_queue_tail(&data->readq, skb); |
| |
| wake_up_interruptible(&data->read_wait); |
| return 0; |
| } |
| |
| static int __vhci_create_device(struct vhci_data *data, __u8 opcode) |
| { |
| struct hci_dev *hdev; |
| struct sk_buff *skb; |
| __u8 dev_type; |
| |
| if (data->hdev) |
| return -EBADFD; |
| |
| /* bits 0-1 are dev_type (Primary or AMP) */ |
| dev_type = opcode & 0x03; |
| |
| if (dev_type != HCI_PRIMARY && dev_type != HCI_AMP) |
| return -EINVAL; |
| |
| /* bits 2-5 are reserved (must be zero) */ |
| if (opcode & 0x3c) |
| return -EINVAL; |
| |
| skb = bt_skb_alloc(4, GFP_KERNEL); |
| if (!skb) |
| return -ENOMEM; |
| |
| hdev = hci_alloc_dev(); |
| if (!hdev) { |
| kfree_skb(skb); |
| return -ENOMEM; |
| } |
| |
| data->hdev = hdev; |
| |
| hdev->bus = HCI_VIRTUAL; |
| hdev->dev_type = dev_type; |
| hci_set_drvdata(hdev, data); |
| |
| hdev->open = vhci_open_dev; |
| hdev->close = vhci_close_dev; |
| hdev->flush = vhci_flush; |
| hdev->send = vhci_send_frame; |
| |
| /* bit 6 is for external configuration */ |
| if (opcode & 0x40) |
| set_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks); |
| |
| /* bit 7 is for raw device */ |
| if (opcode & 0x80) |
| set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks); |
| |
| if (hci_register_dev(hdev) < 0) { |
| BT_ERR("Can't register HCI device"); |
| hci_free_dev(hdev); |
| data->hdev = NULL; |
| kfree_skb(skb); |
| return -EBUSY; |
| } |
| |
| hci_skb_pkt_type(skb) = HCI_VENDOR_PKT; |
| |
| skb_put_u8(skb, 0xff); |
| skb_put_u8(skb, opcode); |
| put_unaligned_le16(hdev->id, skb_put(skb, 2)); |
| skb_queue_tail(&data->readq, skb); |
| |
| wake_up_interruptible(&data->read_wait); |
| return 0; |
| } |
| |
| static int vhci_create_device(struct vhci_data *data, __u8 opcode) |
| { |
| int err; |
| |
| mutex_lock(&data->open_mutex); |
| err = __vhci_create_device(data, opcode); |
| mutex_unlock(&data->open_mutex); |
| |
| return err; |
| } |
| |
| static inline ssize_t vhci_get_user(struct vhci_data *data, |
| struct iov_iter *from) |
| { |
| size_t len = iov_iter_count(from); |
| struct sk_buff *skb; |
| __u8 pkt_type, opcode; |
| int ret; |
| |
| if (len < 2 || len > HCI_MAX_FRAME_SIZE) |
| return -EINVAL; |
| |
| skb = bt_skb_alloc(len, GFP_KERNEL); |
| if (!skb) |
| return -ENOMEM; |
| |
| if (!copy_from_iter_full(skb_put(skb, len), len, from)) { |
| kfree_skb(skb); |
| return -EFAULT; |
| } |
| |
| pkt_type = *((__u8 *) skb->data); |
| skb_pull(skb, 1); |
| |
| switch (pkt_type) { |
| case HCI_EVENT_PKT: |
| case HCI_ACLDATA_PKT: |
| case HCI_SCODATA_PKT: |
| if (!data->hdev) { |
| kfree_skb(skb); |
| return -ENODEV; |
| } |
| |
| hci_skb_pkt_type(skb) = pkt_type; |
| |
| ret = hci_recv_frame(data->hdev, skb); |
| break; |
| |
| case HCI_VENDOR_PKT: |
| cancel_delayed_work_sync(&data->open_timeout); |
| |
| opcode = *((__u8 *) skb->data); |
| skb_pull(skb, 1); |
| |
| if (skb->len > 0) { |
| kfree_skb(skb); |
| return -EINVAL; |
| } |
| |
| kfree_skb(skb); |
| |
| ret = vhci_create_device(data, opcode); |
| break; |
| |
| default: |
| kfree_skb(skb); |
| return -EINVAL; |
| } |
| |
| return (ret < 0) ? ret : len; |
| } |
| |
| static inline ssize_t vhci_put_user(struct vhci_data *data, |
| struct sk_buff *skb, |
| char __user *buf, int count) |
| { |
| char __user *ptr = buf; |
| int len; |
| |
| len = min_t(unsigned int, skb->len, count); |
| |
| if (copy_to_user(ptr, skb->data, len)) |
| return -EFAULT; |
| |
| if (!data->hdev) |
| return len; |
| |
| data->hdev->stat.byte_tx += len; |
| |
| switch (hci_skb_pkt_type(skb)) { |
| case HCI_COMMAND_PKT: |
| data->hdev->stat.cmd_tx++; |
| break; |
| case HCI_ACLDATA_PKT: |
| data->hdev->stat.acl_tx++; |
| break; |
| case HCI_SCODATA_PKT: |
| data->hdev->stat.sco_tx++; |
| break; |
| } |
| |
| return len; |
| } |
| |
| static ssize_t vhci_read(struct file *file, |
| char __user *buf, size_t count, loff_t *pos) |
| { |
| struct vhci_data *data = file->private_data; |
| struct sk_buff *skb; |
| ssize_t ret = 0; |
| |
| while (count) { |
| skb = skb_dequeue(&data->readq); |
| if (skb) { |
| ret = vhci_put_user(data, skb, buf, count); |
| if (ret < 0) |
| skb_queue_head(&data->readq, skb); |
| else |
| kfree_skb(skb); |
| break; |
| } |
| |
| if (file->f_flags & O_NONBLOCK) { |
| ret = -EAGAIN; |
| break; |
| } |
| |
| ret = wait_event_interruptible(data->read_wait, |
| !skb_queue_empty(&data->readq)); |
| if (ret < 0) |
| break; |
| } |
| |
| return ret; |
| } |
| |
| static ssize_t vhci_write(struct kiocb *iocb, struct iov_iter *from) |
| { |
| struct file *file = iocb->ki_filp; |
| struct vhci_data *data = file->private_data; |
| |
| return vhci_get_user(data, from); |
| } |
| |
| static __poll_t vhci_poll(struct file *file, poll_table *wait) |
| { |
| struct vhci_data *data = file->private_data; |
| |
| poll_wait(file, &data->read_wait, wait); |
| |
| if (!skb_queue_empty(&data->readq)) |
| return POLLIN | POLLRDNORM; |
| |
| return POLLOUT | POLLWRNORM; |
| } |
| |
| static void vhci_open_timeout(struct work_struct *work) |
| { |
| struct vhci_data *data = container_of(work, struct vhci_data, |
| open_timeout.work); |
| |
| vhci_create_device(data, amp ? HCI_AMP : HCI_PRIMARY); |
| } |
| |
| static int vhci_open(struct inode *inode, struct file *file) |
| { |
| struct vhci_data *data; |
| |
| data = kzalloc(sizeof(struct vhci_data), GFP_KERNEL); |
| if (!data) |
| return -ENOMEM; |
| |
| skb_queue_head_init(&data->readq); |
| init_waitqueue_head(&data->read_wait); |
| |
| mutex_init(&data->open_mutex); |
| INIT_DELAYED_WORK(&data->open_timeout, vhci_open_timeout); |
| |
| file->private_data = data; |
| nonseekable_open(inode, file); |
| |
| schedule_delayed_work(&data->open_timeout, msecs_to_jiffies(1000)); |
| |
| return 0; |
| } |
| |
| static int vhci_release(struct inode *inode, struct file *file) |
| { |
| struct vhci_data *data = file->private_data; |
| struct hci_dev *hdev; |
| |
| cancel_delayed_work_sync(&data->open_timeout); |
| |
| hdev = data->hdev; |
| |
| if (hdev) { |
| hci_unregister_dev(hdev); |
| hci_free_dev(hdev); |
| } |
| |
| skb_queue_purge(&data->readq); |
| file->private_data = NULL; |
| kfree(data); |
| |
| return 0; |
| } |
| |
| static const struct file_operations vhci_fops = { |
| .owner = THIS_MODULE, |
| .read = vhci_read, |
| .write_iter = vhci_write, |
| .poll = vhci_poll, |
| .open = vhci_open, |
| .release = vhci_release, |
| .llseek = no_llseek, |
| }; |
| |
| static struct miscdevice vhci_miscdev = { |
| .name = "vhci", |
| .fops = &vhci_fops, |
| .minor = VHCI_MINOR, |
| }; |
| module_misc_device(vhci_miscdev); |
| |
| module_param(amp, bool, 0644); |
| MODULE_PARM_DESC(amp, "Create AMP controller device"); |
| |
| MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>"); |
| MODULE_DESCRIPTION("Bluetooth virtual HCI driver ver " VERSION); |
| MODULE_VERSION(VERSION); |
| MODULE_LICENSE("GPL"); |
| MODULE_ALIAS("devname:vhci"); |
| MODULE_ALIAS_MISCDEV(VHCI_MINOR); |