v4.19.13 snapshot.
diff --git a/drivers/bluetooth/hci_vhci.c b/drivers/bluetooth/hci_vhci.c
new file mode 100644
index 0000000..22f9145
--- /dev/null
+++ b/drivers/bluetooth/hci_vhci.c
@@ -0,0 +1,390 @@
+/*
+ *
+ * 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 EPOLLIN | EPOLLRDNORM;
+
+ return EPOLLOUT | EPOLLWRNORM;
+}
+
+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);