605 lines
12 KiB
C
605 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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*
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* Bluetooth virtual HCI driver
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*
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* Copyright (C) 2000-2001 Qualcomm Incorporated
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* Copyright (C) 2002-2003 Maxim Krasnyansky <maxk@qualcomm.com>
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* Copyright (C) 2004-2006 Marcel Holtmann <marcel@holtmann.org>
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*/
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#include <linux/module.h>
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#include <asm/unaligned.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/sched.h>
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#include <linux/poll.h>
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#include <linux/skbuff.h>
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#include <linux/miscdevice.h>
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#include <linux/debugfs.h>
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#include <net/bluetooth/bluetooth.h>
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#include <net/bluetooth/hci_core.h>
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#define VERSION "1.5"
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static bool amp;
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struct vhci_data {
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struct hci_dev *hdev;
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wait_queue_head_t read_wait;
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struct sk_buff_head readq;
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struct mutex open_mutex;
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struct delayed_work open_timeout;
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struct work_struct suspend_work;
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bool suspended;
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bool wakeup;
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__u16 msft_opcode;
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bool aosp_capable;
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};
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static int vhci_open_dev(struct hci_dev *hdev)
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{
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return 0;
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}
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static int vhci_close_dev(struct hci_dev *hdev)
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{
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struct vhci_data *data = hci_get_drvdata(hdev);
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skb_queue_purge(&data->readq);
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return 0;
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}
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static int vhci_flush(struct hci_dev *hdev)
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{
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struct vhci_data *data = hci_get_drvdata(hdev);
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skb_queue_purge(&data->readq);
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return 0;
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}
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static int vhci_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
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{
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struct vhci_data *data = hci_get_drvdata(hdev);
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memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
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skb_queue_tail(&data->readq, skb);
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wake_up_interruptible(&data->read_wait);
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return 0;
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}
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static int vhci_get_data_path_id(struct hci_dev *hdev, u8 *data_path_id)
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{
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*data_path_id = 0;
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return 0;
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}
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static int vhci_get_codec_config_data(struct hci_dev *hdev, __u8 type,
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struct bt_codec *codec, __u8 *vnd_len,
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__u8 **vnd_data)
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{
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if (type != ESCO_LINK)
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return -EINVAL;
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*vnd_len = 0;
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*vnd_data = NULL;
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return 0;
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}
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static bool vhci_wakeup(struct hci_dev *hdev)
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{
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struct vhci_data *data = hci_get_drvdata(hdev);
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return data->wakeup;
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}
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static ssize_t force_suspend_read(struct file *file, char __user *user_buf,
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size_t count, loff_t *ppos)
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{
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struct vhci_data *data = file->private_data;
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char buf[3];
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buf[0] = data->suspended ? 'Y' : 'N';
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buf[1] = '\n';
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buf[2] = '\0';
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return simple_read_from_buffer(user_buf, count, ppos, buf, 2);
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}
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static void vhci_suspend_work(struct work_struct *work)
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{
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struct vhci_data *data = container_of(work, struct vhci_data,
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suspend_work);
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if (data->suspended)
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hci_suspend_dev(data->hdev);
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else
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hci_resume_dev(data->hdev);
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}
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static ssize_t force_suspend_write(struct file *file,
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const char __user *user_buf,
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size_t count, loff_t *ppos)
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{
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struct vhci_data *data = file->private_data;
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bool enable;
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int err;
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err = kstrtobool_from_user(user_buf, count, &enable);
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if (err)
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return err;
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if (data->suspended == enable)
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return -EALREADY;
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data->suspended = enable;
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schedule_work(&data->suspend_work);
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return count;
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}
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static const struct file_operations force_suspend_fops = {
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.open = simple_open,
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.read = force_suspend_read,
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.write = force_suspend_write,
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.llseek = default_llseek,
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};
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static ssize_t force_wakeup_read(struct file *file, char __user *user_buf,
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size_t count, loff_t *ppos)
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{
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struct vhci_data *data = file->private_data;
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char buf[3];
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buf[0] = data->wakeup ? 'Y' : 'N';
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buf[1] = '\n';
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buf[2] = '\0';
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return simple_read_from_buffer(user_buf, count, ppos, buf, 2);
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}
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static ssize_t force_wakeup_write(struct file *file,
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const char __user *user_buf, size_t count,
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loff_t *ppos)
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{
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struct vhci_data *data = file->private_data;
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bool enable;
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int err;
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err = kstrtobool_from_user(user_buf, count, &enable);
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if (err)
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return err;
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if (data->wakeup == enable)
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return -EALREADY;
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data->wakeup = enable;
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return count;
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}
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static const struct file_operations force_wakeup_fops = {
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.open = simple_open,
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.read = force_wakeup_read,
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.write = force_wakeup_write,
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.llseek = default_llseek,
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};
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static int msft_opcode_set(void *data, u64 val)
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{
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struct vhci_data *vhci = data;
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if (val > 0xffff || hci_opcode_ogf(val) != 0x3f)
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return -EINVAL;
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if (vhci->msft_opcode)
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return -EALREADY;
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vhci->msft_opcode = val;
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return 0;
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}
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static int msft_opcode_get(void *data, u64 *val)
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{
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struct vhci_data *vhci = data;
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*val = vhci->msft_opcode;
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return 0;
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}
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DEFINE_DEBUGFS_ATTRIBUTE(msft_opcode_fops, msft_opcode_get, msft_opcode_set,
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"%llu\n");
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static ssize_t aosp_capable_read(struct file *file, char __user *user_buf,
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size_t count, loff_t *ppos)
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{
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struct vhci_data *vhci = file->private_data;
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char buf[3];
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buf[0] = vhci->aosp_capable ? 'Y' : 'N';
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buf[1] = '\n';
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buf[2] = '\0';
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return simple_read_from_buffer(user_buf, count, ppos, buf, 2);
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}
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static ssize_t aosp_capable_write(struct file *file,
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const char __user *user_buf, size_t count,
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loff_t *ppos)
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{
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struct vhci_data *vhci = file->private_data;
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bool enable;
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int err;
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err = kstrtobool_from_user(user_buf, count, &enable);
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if (err)
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return err;
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if (!enable)
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return -EINVAL;
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if (vhci->aosp_capable)
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return -EALREADY;
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vhci->aosp_capable = enable;
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return count;
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}
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static const struct file_operations aosp_capable_fops = {
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.open = simple_open,
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.read = aosp_capable_read,
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.write = aosp_capable_write,
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.llseek = default_llseek,
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};
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static int vhci_setup(struct hci_dev *hdev)
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{
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struct vhci_data *vhci = hci_get_drvdata(hdev);
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if (vhci->msft_opcode)
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hci_set_msft_opcode(hdev, vhci->msft_opcode);
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if (vhci->aosp_capable)
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hci_set_aosp_capable(hdev);
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return 0;
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}
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static int __vhci_create_device(struct vhci_data *data, __u8 opcode)
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{
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struct hci_dev *hdev;
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struct sk_buff *skb;
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__u8 dev_type;
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if (data->hdev)
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return -EBADFD;
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/* bits 0-1 are dev_type (Primary or AMP) */
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dev_type = opcode & 0x03;
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if (dev_type != HCI_PRIMARY && dev_type != HCI_AMP)
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return -EINVAL;
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/* bits 2-5 are reserved (must be zero) */
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if (opcode & 0x3c)
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return -EINVAL;
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skb = bt_skb_alloc(4, GFP_KERNEL);
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if (!skb)
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return -ENOMEM;
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hdev = hci_alloc_dev();
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if (!hdev) {
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kfree_skb(skb);
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return -ENOMEM;
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}
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data->hdev = hdev;
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hdev->bus = HCI_VIRTUAL;
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hdev->dev_type = dev_type;
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hci_set_drvdata(hdev, data);
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hdev->open = vhci_open_dev;
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hdev->close = vhci_close_dev;
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hdev->flush = vhci_flush;
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hdev->send = vhci_send_frame;
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hdev->get_data_path_id = vhci_get_data_path_id;
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hdev->get_codec_config_data = vhci_get_codec_config_data;
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hdev->wakeup = vhci_wakeup;
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hdev->setup = vhci_setup;
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set_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks);
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/* bit 6 is for external configuration */
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if (opcode & 0x40)
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set_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks);
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/* bit 7 is for raw device */
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if (opcode & 0x80)
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set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks);
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set_bit(HCI_QUIRK_VALID_LE_STATES, &hdev->quirks);
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if (hci_register_dev(hdev) < 0) {
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BT_ERR("Can't register HCI device");
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hci_free_dev(hdev);
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data->hdev = NULL;
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kfree_skb(skb);
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return -EBUSY;
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}
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debugfs_create_file("force_suspend", 0644, hdev->debugfs, data,
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&force_suspend_fops);
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debugfs_create_file("force_wakeup", 0644, hdev->debugfs, data,
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&force_wakeup_fops);
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if (IS_ENABLED(CONFIG_BT_MSFTEXT))
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debugfs_create_file("msft_opcode", 0644, hdev->debugfs, data,
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&msft_opcode_fops);
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if (IS_ENABLED(CONFIG_BT_AOSPEXT))
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debugfs_create_file("aosp_capable", 0644, hdev->debugfs, data,
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&aosp_capable_fops);
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hci_skb_pkt_type(skb) = HCI_VENDOR_PKT;
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skb_put_u8(skb, 0xff);
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skb_put_u8(skb, opcode);
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put_unaligned_le16(hdev->id, skb_put(skb, 2));
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skb_queue_tail(&data->readq, skb);
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wake_up_interruptible(&data->read_wait);
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return 0;
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}
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static int vhci_create_device(struct vhci_data *data, __u8 opcode)
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{
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int err;
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mutex_lock(&data->open_mutex);
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err = __vhci_create_device(data, opcode);
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mutex_unlock(&data->open_mutex);
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return err;
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}
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static inline ssize_t vhci_get_user(struct vhci_data *data,
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struct iov_iter *from)
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{
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size_t len = iov_iter_count(from);
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struct sk_buff *skb;
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__u8 pkt_type, opcode;
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int ret;
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if (len < 2 || len > HCI_MAX_FRAME_SIZE)
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return -EINVAL;
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skb = bt_skb_alloc(len, GFP_KERNEL);
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if (!skb)
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return -ENOMEM;
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if (!copy_from_iter_full(skb_put(skb, len), len, from)) {
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kfree_skb(skb);
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return -EFAULT;
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}
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pkt_type = *((__u8 *) skb->data);
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skb_pull(skb, 1);
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switch (pkt_type) {
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case HCI_EVENT_PKT:
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case HCI_ACLDATA_PKT:
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case HCI_SCODATA_PKT:
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case HCI_ISODATA_PKT:
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if (!data->hdev) {
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kfree_skb(skb);
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return -ENODEV;
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}
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hci_skb_pkt_type(skb) = pkt_type;
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ret = hci_recv_frame(data->hdev, skb);
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break;
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case HCI_VENDOR_PKT:
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cancel_delayed_work_sync(&data->open_timeout);
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opcode = *((__u8 *) skb->data);
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skb_pull(skb, 1);
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if (skb->len > 0) {
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kfree_skb(skb);
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return -EINVAL;
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}
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kfree_skb(skb);
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ret = vhci_create_device(data, opcode);
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break;
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default:
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kfree_skb(skb);
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return -EINVAL;
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}
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return (ret < 0) ? ret : len;
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}
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static inline ssize_t vhci_put_user(struct vhci_data *data,
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struct sk_buff *skb,
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char __user *buf, int count)
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{
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char __user *ptr = buf;
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int len;
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len = min_t(unsigned int, skb->len, count);
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if (copy_to_user(ptr, skb->data, len))
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return -EFAULT;
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if (!data->hdev)
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return len;
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data->hdev->stat.byte_tx += len;
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switch (hci_skb_pkt_type(skb)) {
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case HCI_COMMAND_PKT:
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data->hdev->stat.cmd_tx++;
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break;
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case HCI_ACLDATA_PKT:
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data->hdev->stat.acl_tx++;
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break;
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case HCI_SCODATA_PKT:
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data->hdev->stat.sco_tx++;
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break;
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}
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return len;
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}
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static ssize_t vhci_read(struct file *file,
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char __user *buf, size_t count, loff_t *pos)
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{
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struct vhci_data *data = file->private_data;
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struct sk_buff *skb;
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ssize_t ret = 0;
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while (count) {
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skb = skb_dequeue(&data->readq);
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if (skb) {
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ret = vhci_put_user(data, skb, buf, count);
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if (ret < 0)
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skb_queue_head(&data->readq, skb);
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else
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kfree_skb(skb);
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break;
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}
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if (file->f_flags & O_NONBLOCK) {
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ret = -EAGAIN;
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break;
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}
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ret = wait_event_interruptible(data->read_wait,
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!skb_queue_empty(&data->readq));
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if (ret < 0)
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break;
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}
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return ret;
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}
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static ssize_t vhci_write(struct kiocb *iocb, struct iov_iter *from)
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{
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struct file *file = iocb->ki_filp;
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struct vhci_data *data = file->private_data;
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return vhci_get_user(data, from);
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}
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static __poll_t vhci_poll(struct file *file, poll_table *wait)
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{
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struct vhci_data *data = file->private_data;
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poll_wait(file, &data->read_wait, wait);
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if (!skb_queue_empty(&data->readq))
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return EPOLLIN | EPOLLRDNORM;
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return EPOLLOUT | EPOLLWRNORM;
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}
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static void vhci_open_timeout(struct work_struct *work)
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{
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struct vhci_data *data = container_of(work, struct vhci_data,
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open_timeout.work);
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vhci_create_device(data, amp ? HCI_AMP : HCI_PRIMARY);
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}
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static int vhci_open(struct inode *inode, struct file *file)
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{
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struct vhci_data *data;
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data = kzalloc(sizeof(struct vhci_data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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skb_queue_head_init(&data->readq);
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init_waitqueue_head(&data->read_wait);
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mutex_init(&data->open_mutex);
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INIT_DELAYED_WORK(&data->open_timeout, vhci_open_timeout);
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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);
|