Adding upstream version 5.10.209.upstream/5.10.209

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 381 insertions, 0 deletions

diff --git a/drivers/bluetooth/hci_vhci.c b/drivers/bluetooth/hci_vhci.c
new file mode 100644
index 000000000..31d70bad8
--- /dev/null
+++ b/drivers/bluetooth/hci_vhci.c
@@ -0,0 +1,381 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *
+ *  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>
+ */
+
+#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);
+
+	mutex_lock(&data->open_mutex);
+	skb_queue_tail(&data->readq, skb);
+	mutex_unlock(&data->open_mutex);
+
+	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);
+
+	set_bit(HCI_QUIRK_VALID_LE_STATES, &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:
+	case HCI_ISODATA_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);