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-rw-r--r--drivers/bluetooth/hci_vhci.c609
1 files changed, 609 insertions, 0 deletions
diff --git a/drivers/bluetooth/hci_vhci.c b/drivers/bluetooth/hci_vhci.c
new file mode 100644
index 000000000..44dc91555
--- /dev/null
+++ b/drivers/bluetooth/hci_vhci.c
@@ -0,0 +1,609 @@
+// 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/atomic.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 <linux/debugfs.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;
+ struct work_struct suspend_work;
+
+ bool suspended;
+ bool wakeup;
+ __u16 msft_opcode;
+ bool aosp_capable;
+ atomic_t initialized;
+};
+
+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);
+
+ if (atomic_read(&data->initialized))
+ wake_up_interruptible(&data->read_wait);
+ return 0;
+}
+
+static int vhci_get_data_path_id(struct hci_dev *hdev, u8 *data_path_id)
+{
+ *data_path_id = 0;
+ return 0;
+}
+
+static int vhci_get_codec_config_data(struct hci_dev *hdev, __u8 type,
+ struct bt_codec *codec, __u8 *vnd_len,
+ __u8 **vnd_data)
+{
+ if (type != ESCO_LINK)
+ return -EINVAL;
+
+ *vnd_len = 0;
+ *vnd_data = NULL;
+ return 0;
+}
+
+static bool vhci_wakeup(struct hci_dev *hdev)
+{
+ struct vhci_data *data = hci_get_drvdata(hdev);
+
+ return data->wakeup;
+}
+
+static ssize_t force_suspend_read(struct file *file, char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ struct vhci_data *data = file->private_data;
+ char buf[3];
+
+ buf[0] = data->suspended ? 'Y' : 'N';
+ buf[1] = '\n';
+ buf[2] = '\0';
+ return simple_read_from_buffer(user_buf, count, ppos, buf, 2);
+}
+
+static void vhci_suspend_work(struct work_struct *work)
+{
+ struct vhci_data *data = container_of(work, struct vhci_data,
+ suspend_work);
+
+ if (data->suspended)
+ hci_suspend_dev(data->hdev);
+ else
+ hci_resume_dev(data->hdev);
+}
+
+static ssize_t force_suspend_write(struct file *file,
+ const char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ struct vhci_data *data = file->private_data;
+ bool enable;
+ int err;
+
+ err = kstrtobool_from_user(user_buf, count, &enable);
+ if (err)
+ return err;
+
+ if (data->suspended == enable)
+ return -EALREADY;
+
+ data->suspended = enable;
+
+ schedule_work(&data->suspend_work);
+
+ return count;
+}
+
+static const struct file_operations force_suspend_fops = {
+ .open = simple_open,
+ .read = force_suspend_read,
+ .write = force_suspend_write,
+ .llseek = default_llseek,
+};
+
+static ssize_t force_wakeup_read(struct file *file, char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ struct vhci_data *data = file->private_data;
+ char buf[3];
+
+ buf[0] = data->wakeup ? 'Y' : 'N';
+ buf[1] = '\n';
+ buf[2] = '\0';
+ return simple_read_from_buffer(user_buf, count, ppos, buf, 2);
+}
+
+static ssize_t force_wakeup_write(struct file *file,
+ const char __user *user_buf, size_t count,
+ loff_t *ppos)
+{
+ struct vhci_data *data = file->private_data;
+ bool enable;
+ int err;
+
+ err = kstrtobool_from_user(user_buf, count, &enable);
+ if (err)
+ return err;
+
+ if (data->wakeup == enable)
+ return -EALREADY;
+
+ data->wakeup = enable;
+
+ return count;
+}
+
+static const struct file_operations force_wakeup_fops = {
+ .open = simple_open,
+ .read = force_wakeup_read,
+ .write = force_wakeup_write,
+ .llseek = default_llseek,
+};
+
+static int msft_opcode_set(void *data, u64 val)
+{
+ struct vhci_data *vhci = data;
+
+ if (val > 0xffff || hci_opcode_ogf(val) != 0x3f)
+ return -EINVAL;
+
+ if (vhci->msft_opcode)
+ return -EALREADY;
+
+ vhci->msft_opcode = val;
+
+ return 0;
+}
+
+static int msft_opcode_get(void *data, u64 *val)
+{
+ struct vhci_data *vhci = data;
+
+ *val = vhci->msft_opcode;
+
+ return 0;
+}
+
+DEFINE_DEBUGFS_ATTRIBUTE(msft_opcode_fops, msft_opcode_get, msft_opcode_set,
+ "%llu\n");
+
+static ssize_t aosp_capable_read(struct file *file, char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ struct vhci_data *vhci = file->private_data;
+ char buf[3];
+
+ buf[0] = vhci->aosp_capable ? 'Y' : 'N';
+ buf[1] = '\n';
+ buf[2] = '\0';
+ return simple_read_from_buffer(user_buf, count, ppos, buf, 2);
+}
+
+static ssize_t aosp_capable_write(struct file *file,
+ const char __user *user_buf, size_t count,
+ loff_t *ppos)
+{
+ struct vhci_data *vhci = file->private_data;
+ bool enable;
+ int err;
+
+ err = kstrtobool_from_user(user_buf, count, &enable);
+ if (err)
+ return err;
+
+ if (!enable)
+ return -EINVAL;
+
+ if (vhci->aosp_capable)
+ return -EALREADY;
+
+ vhci->aosp_capable = enable;
+
+ return count;
+}
+
+static const struct file_operations aosp_capable_fops = {
+ .open = simple_open,
+ .read = aosp_capable_read,
+ .write = aosp_capable_write,
+ .llseek = default_llseek,
+};
+
+static int vhci_setup(struct hci_dev *hdev)
+{
+ struct vhci_data *vhci = hci_get_drvdata(hdev);
+
+ if (vhci->msft_opcode)
+ hci_set_msft_opcode(hdev, vhci->msft_opcode);
+
+ if (vhci->aosp_capable)
+ hci_set_aosp_capable(hdev);
+
+ 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;
+ hdev->get_data_path_id = vhci_get_data_path_id;
+ hdev->get_codec_config_data = vhci_get_codec_config_data;
+ hdev->wakeup = vhci_wakeup;
+ hdev->setup = vhci_setup;
+ set_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks);
+
+ /* 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;
+ }
+
+ debugfs_create_file("force_suspend", 0644, hdev->debugfs, data,
+ &force_suspend_fops);
+
+ debugfs_create_file("force_wakeup", 0644, hdev->debugfs, data,
+ &force_wakeup_fops);
+
+ if (IS_ENABLED(CONFIG_BT_MSFTEXT))
+ debugfs_create_file("msft_opcode", 0644, hdev->debugfs, data,
+ &msft_opcode_fops);
+
+ if (IS_ENABLED(CONFIG_BT_AOSPEXT))
+ debugfs_create_file("aosp_capable", 0644, hdev->debugfs, data,
+ &aosp_capable_fops);
+
+ 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_head(&data->readq, skb);
+ atomic_inc(&data->initialized);
+
+ 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);
+ INIT_WORK(&data->suspend_work, vhci_suspend_work);
+
+ 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);
+ flush_work(&data->suspend_work);
+
+ 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);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-27 04:45:09 +0000