From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Andr=C3=A9=20Fabian=20Silva=20Delgado?= Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- drivers/bluetooth/hci_vhci.c | 398 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 398 insertions(+) create mode 100644 drivers/bluetooth/hci_vhci.c (limited to 'drivers/bluetooth/hci_vhci.c') diff --git a/drivers/bluetooth/hci_vhci.c b/drivers/bluetooth/hci_vhci.c new file mode 100644 index 000000000..6653473f2 --- /dev/null +++ b/drivers/bluetooth/hci_vhci.c @@ -0,0 +1,398 @@ +/* + * + * Bluetooth virtual HCI driver + * + * Copyright (C) 2000-2001 Qualcomm Incorporated + * Copyright (C) 2002-2003 Maxim Krasnyansky + * Copyright (C) 2004-2006 Marcel Holtmann + * + * + * 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 +#include + +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +#include +#include + +#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 delayed_work open_timeout; +}; + +static int vhci_open_dev(struct hci_dev *hdev) +{ + set_bit(HCI_RUNNING, &hdev->flags); + + return 0; +} + +static int vhci_close_dev(struct hci_dev *hdev) +{ + struct vhci_data *data = hci_get_drvdata(hdev); + + if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags)) + return 0; + + 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); + + if (!test_bit(HCI_RUNNING, &hdev->flags)) + return -EBUSY; + + memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 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; + + /* bits 0-1 are dev_type (BR/EDR or AMP) */ + dev_type = opcode & 0x03; + + if (dev_type != HCI_BREDR && 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; + } + + bt_cb(skb)->pkt_type = HCI_VENDOR_PKT; + + *skb_put(skb, 1) = 0xff; + *skb_put(skb, 1) = 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 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(skb_put(skb, len), len, from) != len) { + 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; + } + + bt_cb(skb)->pkt_type = pkt_type; + + ret = hci_recv_frame(data->hdev, skb); + break; + + case HCI_VENDOR_PKT: + if (data->hdev) { + kfree_skb(skb); + return -EBADFD; + } + + 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 (bt_cb(skb)->pkt_type) { + 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 unsigned int 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_BREDR); +} + +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); + + 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 = data->hdev; + + cancel_delayed_work_sync(&data->open_timeout); + + if (hdev) { + hci_unregister_dev(hdev); + hci_free_dev(hdev); + } + + 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, +}; + +static int __init vhci_init(void) +{ + BT_INFO("Virtual HCI driver ver %s", VERSION); + + return misc_register(&vhci_miscdev); +} + +static void __exit vhci_exit(void) +{ + misc_deregister(&vhci_miscdev); +} + +module_init(vhci_init); +module_exit(vhci_exit); + +module_param(amp, bool, 0644); +MODULE_PARM_DESC(amp, "Create AMP controller device"); + +MODULE_AUTHOR("Marcel Holtmann "); +MODULE_DESCRIPTION("Bluetooth virtual HCI driver ver " VERSION); +MODULE_VERSION(VERSION); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("devname:vhci"); +MODULE_ALIAS_MISCDEV(VHCI_MINOR); -- cgit v1.2.3