--- /dev/null
+/*
+ RFCOMM implementation for Linux Bluetooth stack (BlueZ).
+ Copyright (C) 2002 Maxim Krasnyansky <maxk@qualcomm.com>
+ Copyright (C) 2002 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 version 2 as
+ published by the Free Software Foundation;
+
+ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
+ IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
+ CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
+ WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+ ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
+ COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
+ SOFTWARE IS DISCLAIMED.
+*/
+
+/*
+ * RFCOMM TTY.
+ */
+
+#include <linux/module.h>
+
+#include <linux/tty.h>
+#include <linux/tty_driver.h>
+#include <linux/tty_flip.h>
+
+#include <net/bluetooth/bluetooth.h>
+#include <net/bluetooth/hci_core.h>
+#include <net/bluetooth/rfcomm.h>
+
+#define RFCOMM_TTY_MAGIC 0x6d02 /* magic number for rfcomm struct */
+#define RFCOMM_TTY_PORTS RFCOMM_MAX_DEV /* whole lotta rfcomm devices */
+#define RFCOMM_TTY_MAJOR 216 /* device node major id of the usb/bluetooth.c driver */
+#define RFCOMM_TTY_MINOR 0
+
+static DEFINE_MUTEX(rfcomm_ioctl_mutex);
+static struct tty_driver *rfcomm_tty_driver;
+
+struct rfcomm_dev {
+ struct tty_port port;
+ struct list_head list;
+
+ char name[12];
+ int id;
+ unsigned long flags;
+ int err;
+
+ unsigned long status; /* don't export to userspace */
+
+ bdaddr_t src;
+ bdaddr_t dst;
+ u8 channel;
+
+ uint modem_status;
+
+ struct rfcomm_dlc *dlc;
+
+ struct device *tty_dev;
+
+ atomic_t wmem_alloc;
+
+ struct sk_buff_head pending;
+};
+
+static LIST_HEAD(rfcomm_dev_list);
+static DEFINE_MUTEX(rfcomm_dev_lock);
+
+static void rfcomm_dev_data_ready(struct rfcomm_dlc *dlc, struct sk_buff *skb);
+static void rfcomm_dev_state_change(struct rfcomm_dlc *dlc, int err);
+static void rfcomm_dev_modem_status(struct rfcomm_dlc *dlc, u8 v24_sig);
+
+/* ---- Device functions ---- */
+
+static void rfcomm_dev_destruct(struct tty_port *port)
+{
+ struct rfcomm_dev *dev = container_of(port, struct rfcomm_dev, port);
+ struct rfcomm_dlc *dlc = dev->dlc;
+
+ BT_DBG("dev %p dlc %p", dev, dlc);
+
+ rfcomm_dlc_lock(dlc);
+ /* Detach DLC if it's owned by this dev */
+ if (dlc->owner == dev)
+ dlc->owner = NULL;
+ rfcomm_dlc_unlock(dlc);
+
+ rfcomm_dlc_put(dlc);
+
+ if (dev->tty_dev)
+ tty_unregister_device(rfcomm_tty_driver, dev->id);
+
+ mutex_lock(&rfcomm_dev_lock);
+ list_del(&dev->list);
+ mutex_unlock(&rfcomm_dev_lock);
+
+ kfree(dev);
+
+ /* It's safe to call module_put() here because socket still
+ holds reference to this module. */
+ module_put(THIS_MODULE);
+}
+
+/* device-specific initialization: open the dlc */
+static int rfcomm_dev_activate(struct tty_port *port, struct tty_struct *tty)
+{
+ struct rfcomm_dev *dev = container_of(port, struct rfcomm_dev, port);
+ int err;
+
+ err = rfcomm_dlc_open(dev->dlc, &dev->src, &dev->dst, dev->channel);
+ if (err)
+ set_bit(TTY_IO_ERROR, &tty->flags);
+ return err;
+}
+
+/* we block the open until the dlc->state becomes BT_CONNECTED */
+static int rfcomm_dev_carrier_raised(struct tty_port *port)
+{
+ struct rfcomm_dev *dev = container_of(port, struct rfcomm_dev, port);
+
+ return (dev->dlc->state == BT_CONNECTED);
+}
+
+/* device-specific cleanup: close the dlc */
+static void rfcomm_dev_shutdown(struct tty_port *port)
+{
+ struct rfcomm_dev *dev = container_of(port, struct rfcomm_dev, port);
+
+ if (dev->tty_dev->parent)
+ device_move(dev->tty_dev, NULL, DPM_ORDER_DEV_LAST);
+
+ /* close the dlc */
+ rfcomm_dlc_close(dev->dlc, 0);
+}
+
+static const struct tty_port_operations rfcomm_port_ops = {
+ .destruct = rfcomm_dev_destruct,
+ .activate = rfcomm_dev_activate,
+ .shutdown = rfcomm_dev_shutdown,
+ .carrier_raised = rfcomm_dev_carrier_raised,
+};
+
+static struct rfcomm_dev *__rfcomm_dev_lookup(int id)
+{
+ struct rfcomm_dev *dev;
+
+ list_for_each_entry(dev, &rfcomm_dev_list, list)
+ if (dev->id == id)
+ return dev;
+
+ return NULL;
+}
+
+static struct rfcomm_dev *rfcomm_dev_get(int id)
+{
+ struct rfcomm_dev *dev;
+
+ mutex_lock(&rfcomm_dev_lock);
+
+ dev = __rfcomm_dev_lookup(id);
+
+ if (dev && !tty_port_get(&dev->port))
+ dev = NULL;
+
+ mutex_unlock(&rfcomm_dev_lock);
+
+ return dev;
+}
+
+static void rfcomm_reparent_device(struct rfcomm_dev *dev)
+{
+ struct hci_dev *hdev;
+ struct hci_conn *conn;
+
+ hdev = hci_get_route(&dev->dst, &dev->src);
+ if (!hdev)
+ return;
+
+ /* The lookup results are unsafe to access without the
+ * hci device lock (FIXME: why is this not documented?)
+ */
+ hci_dev_lock(hdev);
+ conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &dev->dst);
+
+ /* Just because the acl link is in the hash table is no
+ * guarantee the sysfs device has been added ...
+ */
+ if (conn && device_is_registered(&conn->dev))
+ device_move(dev->tty_dev, &conn->dev, DPM_ORDER_DEV_AFTER_PARENT);
+
+ hci_dev_unlock(hdev);
+ hci_dev_put(hdev);
+}
+
+static ssize_t show_address(struct device *tty_dev, struct device_attribute *attr, char *buf)
+{
+ struct rfcomm_dev *dev = dev_get_drvdata(tty_dev);
+ return sprintf(buf, "%pMR\n", &dev->dst);
+}
+
+static ssize_t show_channel(struct device *tty_dev, struct device_attribute *attr, char *buf)
+{
+ struct rfcomm_dev *dev = dev_get_drvdata(tty_dev);
+ return sprintf(buf, "%d\n", dev->channel);
+}
+
+static DEVICE_ATTR(address, S_IRUGO, show_address, NULL);
+static DEVICE_ATTR(channel, S_IRUGO, show_channel, NULL);
+
+static struct rfcomm_dev *__rfcomm_dev_add(struct rfcomm_dev_req *req,
+ struct rfcomm_dlc *dlc)
+{
+ struct rfcomm_dev *dev, *entry;
+ struct list_head *head = &rfcomm_dev_list;
+ int err = 0;
+
+ dev = kzalloc(sizeof(struct rfcomm_dev), GFP_KERNEL);
+ if (!dev)
+ return ERR_PTR(-ENOMEM);
+
+ mutex_lock(&rfcomm_dev_lock);
+
+ if (req->dev_id < 0) {
+ dev->id = 0;
+
+ list_for_each_entry(entry, &rfcomm_dev_list, list) {
+ if (entry->id != dev->id)
+ break;
+
+ dev->id++;
+ head = &entry->list;
+ }
+ } else {
+ dev->id = req->dev_id;
+
+ list_for_each_entry(entry, &rfcomm_dev_list, list) {
+ if (entry->id == dev->id) {
+ err = -EADDRINUSE;
+ goto out;
+ }
+
+ if (entry->id > dev->id - 1)
+ break;
+
+ head = &entry->list;
+ }
+ }
+
+ if ((dev->id < 0) || (dev->id > RFCOMM_MAX_DEV - 1)) {
+ err = -ENFILE;
+ goto out;
+ }
+
+ sprintf(dev->name, "rfcomm%d", dev->id);
+
+ list_add(&dev->list, head);
+
+ bacpy(&dev->src, &req->src);
+ bacpy(&dev->dst, &req->dst);
+ dev->channel = req->channel;
+
+ dev->flags = req->flags &
+ ((1 << RFCOMM_RELEASE_ONHUP) | (1 << RFCOMM_REUSE_DLC));
+
+ tty_port_init(&dev->port);
+ dev->port.ops = &rfcomm_port_ops;
+
+ skb_queue_head_init(&dev->pending);
+
+ rfcomm_dlc_lock(dlc);
+
+ if (req->flags & (1 << RFCOMM_REUSE_DLC)) {
+ struct sock *sk = dlc->owner;
+ struct sk_buff *skb;
+
+ BUG_ON(!sk);
+
+ rfcomm_dlc_throttle(dlc);
+
+ while ((skb = skb_dequeue(&sk->sk_receive_queue))) {
+ skb_orphan(skb);
+ skb_queue_tail(&dev->pending, skb);
+ atomic_sub(skb->len, &sk->sk_rmem_alloc);
+ }
+ }
+
+ dlc->data_ready = rfcomm_dev_data_ready;
+ dlc->state_change = rfcomm_dev_state_change;
+ dlc->modem_status = rfcomm_dev_modem_status;
+
+ dlc->owner = dev;
+ dev->dlc = dlc;
+
+ rfcomm_dev_modem_status(dlc, dlc->remote_v24_sig);
+
+ rfcomm_dlc_unlock(dlc);
+
+ /* It's safe to call __module_get() here because socket already
+ holds reference to this module. */
+ __module_get(THIS_MODULE);
+
+ mutex_unlock(&rfcomm_dev_lock);
+ return dev;
+
+out:
+ mutex_unlock(&rfcomm_dev_lock);
+ kfree(dev);
+ return ERR_PTR(err);
+}
+
+static int rfcomm_dev_add(struct rfcomm_dev_req *req, struct rfcomm_dlc *dlc)
+{
+ struct rfcomm_dev *dev;
+ struct device *tty;
+
+ BT_DBG("id %d channel %d", req->dev_id, req->channel);
+
+ dev = __rfcomm_dev_add(req, dlc);
+ if (IS_ERR(dev)) {
+ rfcomm_dlc_put(dlc);
+ return PTR_ERR(dev);
+ }
+
+ tty = tty_port_register_device(&dev->port, rfcomm_tty_driver,
+ dev->id, NULL);
+ if (IS_ERR(tty)) {
+ tty_port_put(&dev->port);
+ return PTR_ERR(tty);
+ }
+
+ dev->tty_dev = tty;
+ rfcomm_reparent_device(dev);
+ dev_set_drvdata(dev->tty_dev, dev);
+
+ if (device_create_file(dev->tty_dev, &dev_attr_address) < 0)
+ BT_ERR("Failed to create address attribute");
+
+ if (device_create_file(dev->tty_dev, &dev_attr_channel) < 0)
+ BT_ERR("Failed to create channel attribute");
+
+ return dev->id;
+}
+
+/* ---- Send buffer ---- */
+static inline unsigned int rfcomm_room(struct rfcomm_dev *dev)
+{
+ struct rfcomm_dlc *dlc = dev->dlc;
+
+ /* Limit the outstanding number of packets not yet sent to 40 */
+ int pending = 40 - atomic_read(&dev->wmem_alloc);
+
+ return max(0, pending) * dlc->mtu;
+}
+
+static void rfcomm_wfree(struct sk_buff *skb)
+{
+ struct rfcomm_dev *dev = (void *) skb->sk;
+ atomic_dec(&dev->wmem_alloc);
+ if (test_bit(RFCOMM_TTY_ATTACHED, &dev->flags))
+ tty_port_tty_wakeup(&dev->port);
+ tty_port_put(&dev->port);
+}
+
+static void rfcomm_set_owner_w(struct sk_buff *skb, struct rfcomm_dev *dev)
+{
+ tty_port_get(&dev->port);
+ atomic_inc(&dev->wmem_alloc);
+ skb->sk = (void *) dev;
+ skb->destructor = rfcomm_wfree;
+}
+
+static struct sk_buff *rfcomm_wmalloc(struct rfcomm_dev *dev, unsigned long size, gfp_t priority)
+{
+ struct sk_buff *skb = alloc_skb(size, priority);
+ if (skb)
+ rfcomm_set_owner_w(skb, dev);
+ return skb;
+}
+
+/* ---- Device IOCTLs ---- */
+
+#define NOCAP_FLAGS ((1 << RFCOMM_REUSE_DLC) | (1 << RFCOMM_RELEASE_ONHUP))
+
+static int __rfcomm_create_dev(struct sock *sk, void __user *arg)
+{
+ struct rfcomm_dev_req req;
+ struct rfcomm_dlc *dlc;
+ int id;
+
+ if (copy_from_user(&req, arg, sizeof(req)))
+ return -EFAULT;
+
+ BT_DBG("sk %p dev_id %d flags 0x%x", sk, req.dev_id, req.flags);
+
+ if (req.flags != NOCAP_FLAGS && !capable(CAP_NET_ADMIN))
+ return -EPERM;
+
+ if (req.flags & (1 << RFCOMM_REUSE_DLC)) {
+ /* Socket must be connected */
+ if (sk->sk_state != BT_CONNECTED)
+ return -EBADFD;
+
+ dlc = rfcomm_pi(sk)->dlc;
+ rfcomm_dlc_hold(dlc);
+ } else {
+ /* Validate the channel is unused */
+ dlc = rfcomm_dlc_exists(&req.src, &req.dst, req.channel);
+ if (IS_ERR(dlc))
+ return PTR_ERR(dlc);
+ else if (dlc) {
+ rfcomm_dlc_put(dlc);
+ return -EBUSY;
+ }
+ dlc = rfcomm_dlc_alloc(GFP_KERNEL);
+ if (!dlc)
+ return -ENOMEM;
+ }
+
+ id = rfcomm_dev_add(&req, dlc);
+ if (id < 0)
+ return id;
+
+ if (req.flags & (1 << RFCOMM_REUSE_DLC)) {
+ /* DLC is now used by device.
+ * Socket must be disconnected */
+ sk->sk_state = BT_CLOSED;
+ }
+
+ return id;
+}
+
+static int __rfcomm_release_dev(void __user *arg)
+{
+ struct rfcomm_dev_req req;
+ struct rfcomm_dev *dev;
+ struct tty_struct *tty;
+
+ if (copy_from_user(&req, arg, sizeof(req)))
+ return -EFAULT;
+
+ BT_DBG("dev_id %d flags 0x%x", req.dev_id, req.flags);
+
+ dev = rfcomm_dev_get(req.dev_id);
+ if (!dev)
+ return -ENODEV;
+
+ if (dev->flags != NOCAP_FLAGS && !capable(CAP_NET_ADMIN)) {
+ tty_port_put(&dev->port);
+ return -EPERM;
+ }
+
+ /* only release once */
+ if (test_and_set_bit(RFCOMM_DEV_RELEASED, &dev->status)) {
+ tty_port_put(&dev->port);
+ return -EALREADY;
+ }
+
+ if (req.flags & (1 << RFCOMM_HANGUP_NOW))
+ rfcomm_dlc_close(dev->dlc, 0);
+
+ /* Shut down TTY synchronously before freeing rfcomm_dev */
+ tty = tty_port_tty_get(&dev->port);
+ if (tty) {
+ tty_vhangup(tty);
+ tty_kref_put(tty);
+ }
+
+ if (!test_bit(RFCOMM_TTY_OWNED, &dev->status))
+ tty_port_put(&dev->port);
+
+ tty_port_put(&dev->port);
+ return 0;
+}
+
+static int rfcomm_create_dev(struct sock *sk, void __user *arg)
+{
+ int ret;
+
+ mutex_lock(&rfcomm_ioctl_mutex);
+ ret = __rfcomm_create_dev(sk, arg);
+ mutex_unlock(&rfcomm_ioctl_mutex);
+
+ return ret;
+}
+
+static int rfcomm_release_dev(void __user *arg)
+{
+ int ret;
+
+ mutex_lock(&rfcomm_ioctl_mutex);
+ ret = __rfcomm_release_dev(arg);
+ mutex_unlock(&rfcomm_ioctl_mutex);
+
+ return ret;
+}
+
+static int rfcomm_get_dev_list(void __user *arg)
+{
+ struct rfcomm_dev *dev;
+ struct rfcomm_dev_list_req *dl;
+ struct rfcomm_dev_info *di;
+ int n = 0, size, err;
+ u16 dev_num;
+
+ BT_DBG("");
+
+ if (get_user(dev_num, (u16 __user *) arg))
+ return -EFAULT;
+
+ if (!dev_num || dev_num > (PAGE_SIZE * 4) / sizeof(*di))
+ return -EINVAL;
+
+ size = sizeof(*dl) + dev_num * sizeof(*di);
+
+ dl = kzalloc(size, GFP_KERNEL);
+ if (!dl)
+ return -ENOMEM;
+
+ di = dl->dev_info;
+
+ mutex_lock(&rfcomm_dev_lock);
+
+ list_for_each_entry(dev, &rfcomm_dev_list, list) {
+ if (!tty_port_get(&dev->port))
+ continue;
+ (di + n)->id = dev->id;
+ (di + n)->flags = dev->flags;
+ (di + n)->state = dev->dlc->state;
+ (di + n)->channel = dev->channel;
+ bacpy(&(di + n)->src, &dev->src);
+ bacpy(&(di + n)->dst, &dev->dst);
+ tty_port_put(&dev->port);
+ if (++n >= dev_num)
+ break;
+ }
+
+ mutex_unlock(&rfcomm_dev_lock);
+
+ dl->dev_num = n;
+ size = sizeof(*dl) + n * sizeof(*di);
+
+ err = copy_to_user(arg, dl, size);
+ kfree(dl);
+
+ return err ? -EFAULT : 0;
+}
+
+static int rfcomm_get_dev_info(void __user *arg)
+{
+ struct rfcomm_dev *dev;
+ struct rfcomm_dev_info di;
+ int err = 0;
+
+ BT_DBG("");
+
+ if (copy_from_user(&di, arg, sizeof(di)))
+ return -EFAULT;
+
+ dev = rfcomm_dev_get(di.id);
+ if (!dev)
+ return -ENODEV;
+
+ di.flags = dev->flags;
+ di.channel = dev->channel;
+ di.state = dev->dlc->state;
+ bacpy(&di.src, &dev->src);
+ bacpy(&di.dst, &dev->dst);
+
+ if (copy_to_user(arg, &di, sizeof(di)))
+ err = -EFAULT;
+
+ tty_port_put(&dev->port);
+ return err;
+}
+
+int rfcomm_dev_ioctl(struct sock *sk, unsigned int cmd, void __user *arg)
+{
+ BT_DBG("cmd %d arg %p", cmd, arg);
+
+ switch (cmd) {
+ case RFCOMMCREATEDEV:
+ return rfcomm_create_dev(sk, arg);
+
+ case RFCOMMRELEASEDEV:
+ return rfcomm_release_dev(arg);
+
+ case RFCOMMGETDEVLIST:
+ return rfcomm_get_dev_list(arg);
+
+ case RFCOMMGETDEVINFO:
+ return rfcomm_get_dev_info(arg);
+ }
+
+ return -EINVAL;
+}
+
+/* ---- DLC callbacks ---- */
+static void rfcomm_dev_data_ready(struct rfcomm_dlc *dlc, struct sk_buff *skb)
+{
+ struct rfcomm_dev *dev = dlc->owner;
+
+ if (!dev) {
+ kfree_skb(skb);
+ return;
+ }
+
+ if (!skb_queue_empty(&dev->pending)) {
+ skb_queue_tail(&dev->pending, skb);
+ return;
+ }
+
+ BT_DBG("dlc %p len %d", dlc, skb->len);
+
+ tty_insert_flip_string(&dev->port, skb->data, skb->len);
+ tty_flip_buffer_push(&dev->port);
+
+ kfree_skb(skb);
+}
+
+static void rfcomm_dev_state_change(struct rfcomm_dlc *dlc, int err)
+{
+ struct rfcomm_dev *dev = dlc->owner;
+ if (!dev)
+ return;
+
+ BT_DBG("dlc %p dev %p err %d", dlc, dev, err);
+
+ dev->err = err;
+ if (dlc->state == BT_CONNECTED) {
+ rfcomm_reparent_device(dev);
+
+ wake_up_interruptible(&dev->port.open_wait);
+ } else if (dlc->state == BT_CLOSED)
+ tty_port_tty_hangup(&dev->port, false);
+}
+
+static void rfcomm_dev_modem_status(struct rfcomm_dlc *dlc, u8 v24_sig)
+{
+ struct rfcomm_dev *dev = dlc->owner;
+ if (!dev)
+ return;
+
+ BT_DBG("dlc %p dev %p v24_sig 0x%02x", dlc, dev, v24_sig);
+
+ if ((dev->modem_status & TIOCM_CD) && !(v24_sig & RFCOMM_V24_DV))
+ tty_port_tty_hangup(&dev->port, true);
+
+ dev->modem_status =
+ ((v24_sig & RFCOMM_V24_RTC) ? (TIOCM_DSR | TIOCM_DTR) : 0) |
+ ((v24_sig & RFCOMM_V24_RTR) ? (TIOCM_RTS | TIOCM_CTS) : 0) |
+ ((v24_sig & RFCOMM_V24_IC) ? TIOCM_RI : 0) |
+ ((v24_sig & RFCOMM_V24_DV) ? TIOCM_CD : 0);
+}
+
+/* ---- TTY functions ---- */
+static void rfcomm_tty_copy_pending(struct rfcomm_dev *dev)
+{
+ struct sk_buff *skb;
+ int inserted = 0;
+
+ BT_DBG("dev %p", dev);
+
+ rfcomm_dlc_lock(dev->dlc);
+
+ while ((skb = skb_dequeue(&dev->pending))) {
+ inserted += tty_insert_flip_string(&dev->port, skb->data,
+ skb->len);
+ kfree_skb(skb);
+ }
+
+ rfcomm_dlc_unlock(dev->dlc);
+
+ if (inserted > 0)
+ tty_flip_buffer_push(&dev->port);
+}
+
+/* do the reverse of install, clearing the tty fields and releasing the
+ * reference to tty_port
+ */
+static void rfcomm_tty_cleanup(struct tty_struct *tty)
+{
+ struct rfcomm_dev *dev = tty->driver_data;
+
+ clear_bit(RFCOMM_TTY_ATTACHED, &dev->flags);
+
+ rfcomm_dlc_lock(dev->dlc);
+ tty->driver_data = NULL;
+ rfcomm_dlc_unlock(dev->dlc);
+
+ /*
+ * purge the dlc->tx_queue to avoid circular dependencies
+ * between dev and dlc
+ */
+ skb_queue_purge(&dev->dlc->tx_queue);
+
+ tty_port_put(&dev->port);
+}
+
+/* we acquire the tty_port reference since it's here the tty is first used
+ * by setting the termios. We also populate the driver_data field and install
+ * the tty port
+ */
+static int rfcomm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
+{
+ struct rfcomm_dev *dev;
+ struct rfcomm_dlc *dlc;
+ int err;
+
+ dev = rfcomm_dev_get(tty->index);
+ if (!dev)
+ return -ENODEV;
+
+ dlc = dev->dlc;
+
+ /* Attach TTY and open DLC */
+ rfcomm_dlc_lock(dlc);
+ tty->driver_data = dev;
+ rfcomm_dlc_unlock(dlc);
+ set_bit(RFCOMM_TTY_ATTACHED, &dev->flags);
+
+ /* install the tty_port */
+ err = tty_port_install(&dev->port, driver, tty);
+ if (err) {
+ rfcomm_tty_cleanup(tty);
+ return err;
+ }
+
+ /* take over the tty_port reference if the port was created with the
+ * flag RFCOMM_RELEASE_ONHUP. This will force the release of the port
+ * when the last process closes the tty. The behaviour is expected by
+ * userspace.
+ */
+ if (test_bit(RFCOMM_RELEASE_ONHUP, &dev->flags)) {
+ set_bit(RFCOMM_TTY_OWNED, &dev->status);
+ tty_port_put(&dev->port);
+ }
+
+ return 0;
+}
+
+static int rfcomm_tty_open(struct tty_struct *tty, struct file *filp)
+{
+ struct rfcomm_dev *dev = tty->driver_data;
+ int err;
+
+ BT_DBG("tty %p id %d", tty, tty->index);
+
+ BT_DBG("dev %p dst %pMR channel %d opened %d", dev, &dev->dst,
+ dev->channel, dev->port.count);
+
+ err = tty_port_open(&dev->port, tty, filp);
+ if (err)
+ return err;
+
+ /*
+ * FIXME: rfcomm should use proper flow control for
+ * received data. This hack will be unnecessary and can
+ * be removed when that's implemented
+ */
+ rfcomm_tty_copy_pending(dev);
+
+ rfcomm_dlc_unthrottle(dev->dlc);
+
+ return 0;
+}
+
+static void rfcomm_tty_close(struct tty_struct *tty, struct file *filp)
+{
+ struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
+
+ BT_DBG("tty %p dev %p dlc %p opened %d", tty, dev, dev->dlc,
+ dev->port.count);
+
+ tty_port_close(&dev->port, tty, filp);
+}
+
+static int rfcomm_tty_write(struct tty_struct *tty, const unsigned char *buf, int count)
+{
+ struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
+ struct rfcomm_dlc *dlc = dev->dlc;
+ struct sk_buff *skb;
+ int sent = 0, size;
+
+ BT_DBG("tty %p count %d", tty, count);
+
+ while (count) {
+ size = min_t(uint, count, dlc->mtu);
+
+ skb = rfcomm_wmalloc(dev, size + RFCOMM_SKB_RESERVE, GFP_ATOMIC);
+ if (!skb)
+ break;
+
+ skb_reserve(skb, RFCOMM_SKB_HEAD_RESERVE);
+
+ memcpy(skb_put(skb, size), buf + sent, size);
+
+ rfcomm_dlc_send_noerror(dlc, skb);
+
+ sent += size;
+ count -= size;
+ }
+
+ return sent;
+}
+
+static int rfcomm_tty_write_room(struct tty_struct *tty)
+{
+ struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
+ int room = 0;
+
+ if (dev && dev->dlc)
+ room = rfcomm_room(dev);
+
+ BT_DBG("tty %p room %d", tty, room);
+
+ return room;
+}
+
+static int rfcomm_tty_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg)
+{
+ BT_DBG("tty %p cmd 0x%02x", tty, cmd);
+
+ switch (cmd) {
+ case TCGETS:
+ BT_DBG("TCGETS is not supported");
+ return -ENOIOCTLCMD;
+
+ case TCSETS:
+ BT_DBG("TCSETS is not supported");
+ return -ENOIOCTLCMD;
+
+ case TIOCMIWAIT:
+ BT_DBG("TIOCMIWAIT");
+ break;
+
+ case TIOCGSERIAL:
+ BT_ERR("TIOCGSERIAL is not supported");
+ return -ENOIOCTLCMD;
+
+ case TIOCSSERIAL:
+ BT_ERR("TIOCSSERIAL is not supported");
+ return -ENOIOCTLCMD;
+
+ case TIOCSERGSTRUCT:
+ BT_ERR("TIOCSERGSTRUCT is not supported");
+ return -ENOIOCTLCMD;
+
+ case TIOCSERGETLSR:
+ BT_ERR("TIOCSERGETLSR is not supported");
+ return -ENOIOCTLCMD;
+
+ case TIOCSERCONFIG:
+ BT_ERR("TIOCSERCONFIG is not supported");
+ return -ENOIOCTLCMD;
+
+ default:
+ return -ENOIOCTLCMD; /* ioctls which we must ignore */
+
+ }
+
+ return -ENOIOCTLCMD;
+}
+
+static void rfcomm_tty_set_termios(struct tty_struct *tty, struct ktermios *old)
+{
+ struct ktermios *new = &tty->termios;
+ int old_baud_rate = tty_termios_baud_rate(old);
+ int new_baud_rate = tty_termios_baud_rate(new);
+
+ u8 baud, data_bits, stop_bits, parity, x_on, x_off;
+ u16 changes = 0;
+
+ struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
+
+ BT_DBG("tty %p termios %p", tty, old);
+
+ if (!dev || !dev->dlc || !dev->dlc->session)
+ return;
+
+ /* Handle turning off CRTSCTS */
+ if ((old->c_cflag & CRTSCTS) && !(new->c_cflag & CRTSCTS))
+ BT_DBG("Turning off CRTSCTS unsupported");
+
+ /* Parity on/off and when on, odd/even */
+ if (((old->c_cflag & PARENB) != (new->c_cflag & PARENB)) ||
+ ((old->c_cflag & PARODD) != (new->c_cflag & PARODD))) {
+ changes |= RFCOMM_RPN_PM_PARITY;
+ BT_DBG("Parity change detected.");
+ }
+
+ /* Mark and space parity are not supported! */
+ if (new->c_cflag & PARENB) {
+ if (new->c_cflag & PARODD) {
+ BT_DBG("Parity is ODD");
+ parity = RFCOMM_RPN_PARITY_ODD;
+ } else {
+ BT_DBG("Parity is EVEN");
+ parity = RFCOMM_RPN_PARITY_EVEN;
+ }
+ } else {
+ BT_DBG("Parity is OFF");
+ parity = RFCOMM_RPN_PARITY_NONE;
+ }
+
+ /* Setting the x_on / x_off characters */
+ if (old->c_cc[VSTOP] != new->c_cc[VSTOP]) {
+ BT_DBG("XOFF custom");
+ x_on = new->c_cc[VSTOP];
+ changes |= RFCOMM_RPN_PM_XON;
+ } else {
+ BT_DBG("XOFF default");
+ x_on = RFCOMM_RPN_XON_CHAR;
+ }
+
+ if (old->c_cc[VSTART] != new->c_cc[VSTART]) {
+ BT_DBG("XON custom");
+ x_off = new->c_cc[VSTART];
+ changes |= RFCOMM_RPN_PM_XOFF;
+ } else {
+ BT_DBG("XON default");
+ x_off = RFCOMM_RPN_XOFF_CHAR;
+ }
+
+ /* Handle setting of stop bits */
+ if ((old->c_cflag & CSTOPB) != (new->c_cflag & CSTOPB))
+ changes |= RFCOMM_RPN_PM_STOP;
+
+ /* POSIX does not support 1.5 stop bits and RFCOMM does not
+ * support 2 stop bits. So a request for 2 stop bits gets
+ * translated to 1.5 stop bits */
+ if (new->c_cflag & CSTOPB)
+ stop_bits = RFCOMM_RPN_STOP_15;
+ else
+ stop_bits = RFCOMM_RPN_STOP_1;
+
+ /* Handle number of data bits [5-8] */
+ if ((old->c_cflag & CSIZE) != (new->c_cflag & CSIZE))
+ changes |= RFCOMM_RPN_PM_DATA;
+
+ switch (new->c_cflag & CSIZE) {
+ case CS5:
+ data_bits = RFCOMM_RPN_DATA_5;
+ break;
+ case CS6:
+ data_bits = RFCOMM_RPN_DATA_6;
+ break;
+ case CS7:
+ data_bits = RFCOMM_RPN_DATA_7;
+ break;
+ case CS8:
+ data_bits = RFCOMM_RPN_DATA_8;
+ break;
+ default:
+ data_bits = RFCOMM_RPN_DATA_8;
+ break;
+ }
+
+ /* Handle baudrate settings */
+ if (old_baud_rate != new_baud_rate)
+ changes |= RFCOMM_RPN_PM_BITRATE;
+
+ switch (new_baud_rate) {
+ case 2400:
+ baud = RFCOMM_RPN_BR_2400;
+ break;
+ case 4800:
+ baud = RFCOMM_RPN_BR_4800;
+ break;
+ case 7200:
+ baud = RFCOMM_RPN_BR_7200;
+ break;
+ case 9600:
+ baud = RFCOMM_RPN_BR_9600;
+ break;
+ case 19200:
+ baud = RFCOMM_RPN_BR_19200;
+ break;
+ case 38400:
+ baud = RFCOMM_RPN_BR_38400;
+ break;
+ case 57600:
+ baud = RFCOMM_RPN_BR_57600;
+ break;
+ case 115200:
+ baud = RFCOMM_RPN_BR_115200;
+ break;
+ case 230400:
+ baud = RFCOMM_RPN_BR_230400;
+ break;
+ default:
+ /* 9600 is standard accordinag to the RFCOMM specification */
+ baud = RFCOMM_RPN_BR_9600;
+ break;
+
+ }
+
+ if (changes)
+ rfcomm_send_rpn(dev->dlc->session, 1, dev->dlc->dlci, baud,
+ data_bits, stop_bits, parity,
+ RFCOMM_RPN_FLOW_NONE, x_on, x_off, changes);
+}
+
+static void rfcomm_tty_throttle(struct tty_struct *tty)
+{
+ struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
+
+ BT_DBG("tty %p dev %p", tty, dev);
+
+ rfcomm_dlc_throttle(dev->dlc);
+}
+
+static void rfcomm_tty_unthrottle(struct tty_struct *tty)
+{
+ struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
+
+ BT_DBG("tty %p dev %p", tty, dev);
+
+ rfcomm_dlc_unthrottle(dev->dlc);
+}
+
+static int rfcomm_tty_chars_in_buffer(struct tty_struct *tty)
+{
+ struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
+
+ BT_DBG("tty %p dev %p", tty, dev);
+
+ if (!dev || !dev->dlc)
+ return 0;
+
+ if (!skb_queue_empty(&dev->dlc->tx_queue))
+ return dev->dlc->mtu;
+
+ return 0;
+}
+
+static void rfcomm_tty_flush_buffer(struct tty_struct *tty)
+{
+ struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
+
+ BT_DBG("tty %p dev %p", tty, dev);
+
+ if (!dev || !dev->dlc)
+ return;
+
+ skb_queue_purge(&dev->dlc->tx_queue);
+ tty_wakeup(tty);
+}
+
+static void rfcomm_tty_send_xchar(struct tty_struct *tty, char ch)
+{
+ BT_DBG("tty %p ch %c", tty, ch);
+}
+
+static void rfcomm_tty_wait_until_sent(struct tty_struct *tty, int timeout)
+{
+ BT_DBG("tty %p timeout %d", tty, timeout);
+}
+
+static void rfcomm_tty_hangup(struct tty_struct *tty)
+{
+ struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
+
+ BT_DBG("tty %p dev %p", tty, dev);
+
+ tty_port_hangup(&dev->port);
+}
+
+static int rfcomm_tty_tiocmget(struct tty_struct *tty)
+{
+ struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
+
+ BT_DBG("tty %p dev %p", tty, dev);
+
+ return dev->modem_status;
+}
+
+static int rfcomm_tty_tiocmset(struct tty_struct *tty, unsigned int set, unsigned int clear)
+{
+ struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
+ struct rfcomm_dlc *dlc = dev->dlc;
+ u8 v24_sig;
+
+ BT_DBG("tty %p dev %p set 0x%02x clear 0x%02x", tty, dev, set, clear);
+
+ rfcomm_dlc_get_modem_status(dlc, &v24_sig);
+
+ if (set & TIOCM_DSR || set & TIOCM_DTR)
+ v24_sig |= RFCOMM_V24_RTC;
+ if (set & TIOCM_RTS || set & TIOCM_CTS)
+ v24_sig |= RFCOMM_V24_RTR;
+ if (set & TIOCM_RI)
+ v24_sig |= RFCOMM_V24_IC;
+ if (set & TIOCM_CD)
+ v24_sig |= RFCOMM_V24_DV;
+
+ if (clear & TIOCM_DSR || clear & TIOCM_DTR)
+ v24_sig &= ~RFCOMM_V24_RTC;
+ if (clear & TIOCM_RTS || clear & TIOCM_CTS)
+ v24_sig &= ~RFCOMM_V24_RTR;
+ if (clear & TIOCM_RI)
+ v24_sig &= ~RFCOMM_V24_IC;
+ if (clear & TIOCM_CD)
+ v24_sig &= ~RFCOMM_V24_DV;
+
+ rfcomm_dlc_set_modem_status(dlc, v24_sig);
+
+ return 0;
+}
+
+/* ---- TTY structure ---- */
+
+static const struct tty_operations rfcomm_ops = {
+ .open = rfcomm_tty_open,
+ .close = rfcomm_tty_close,
+ .write = rfcomm_tty_write,
+ .write_room = rfcomm_tty_write_room,
+ .chars_in_buffer = rfcomm_tty_chars_in_buffer,
+ .flush_buffer = rfcomm_tty_flush_buffer,
+ .ioctl = rfcomm_tty_ioctl,
+ .throttle = rfcomm_tty_throttle,
+ .unthrottle = rfcomm_tty_unthrottle,
+ .set_termios = rfcomm_tty_set_termios,
+ .send_xchar = rfcomm_tty_send_xchar,
+ .hangup = rfcomm_tty_hangup,
+ .wait_until_sent = rfcomm_tty_wait_until_sent,
+ .tiocmget = rfcomm_tty_tiocmget,
+ .tiocmset = rfcomm_tty_tiocmset,
+ .install = rfcomm_tty_install,
+ .cleanup = rfcomm_tty_cleanup,
+};
+
+int __init rfcomm_init_ttys(void)
+{
+ int error;
+
+ rfcomm_tty_driver = alloc_tty_driver(RFCOMM_TTY_PORTS);
+ if (!rfcomm_tty_driver)
+ return -ENOMEM;
+
+ rfcomm_tty_driver->driver_name = "rfcomm";
+ rfcomm_tty_driver->name = "rfcomm";
+ rfcomm_tty_driver->major = RFCOMM_TTY_MAJOR;
+ rfcomm_tty_driver->minor_start = RFCOMM_TTY_MINOR;
+ rfcomm_tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
+ rfcomm_tty_driver->subtype = SERIAL_TYPE_NORMAL;
+ rfcomm_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
+ rfcomm_tty_driver->init_termios = tty_std_termios;
+ rfcomm_tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL;
+ rfcomm_tty_driver->init_termios.c_lflag &= ~ICANON;
+ tty_set_operations(rfcomm_tty_driver, &rfcomm_ops);
+
+ error = tty_register_driver(rfcomm_tty_driver);
+ if (error) {
+ BT_ERR("Can't register RFCOMM TTY driver");
+ put_tty_driver(rfcomm_tty_driver);
+ return error;
+ }
+
+ BT_INFO("RFCOMM TTY layer initialized");
+
+ return 0;
+}
+
+void rfcomm_cleanup_ttys(void)
+{
+ tty_unregister_driver(rfcomm_tty_driver);
+ put_tty_driver(rfcomm_tty_driver);
+}
Code Review / kvmfornfv.git / blobdiff