--- /dev/null
+/*
+ *
+ * Bluetooth HCI UART driver
+ *
+ * Copyright (C) 2000-2001 Qualcomm Incorporated
+ * Copyright (C) 2002-2003 Maxim Krasnyansky <maxk@qualcomm.com>
+ * Copyright (C) 2004-2005 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 <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/fcntl.h>
+#include <linux/interrupt.h>
+#include <linux/ptrace.h>
+#include <linux/poll.h>
+
+#include <linux/slab.h>
+#include <linux/tty.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/signal.h>
+#include <linux/ioctl.h>
+#include <linux/skbuff.h>
+
+#include <net/bluetooth/bluetooth.h>
+#include <net/bluetooth/hci_core.h>
+
+#include "btintel.h"
+#include "btbcm.h"
+#include "hci_uart.h"
+
+#define VERSION "2.3"
+
+static const struct hci_uart_proto *hup[HCI_UART_MAX_PROTO];
+
+int hci_uart_register_proto(const struct hci_uart_proto *p)
+{
+ if (p->id >= HCI_UART_MAX_PROTO)
+ return -EINVAL;
+
+ if (hup[p->id])
+ return -EEXIST;
+
+ hup[p->id] = p;
+
+ BT_INFO("HCI UART protocol %s registered", p->name);
+
+ return 0;
+}
+
+int hci_uart_unregister_proto(const struct hci_uart_proto *p)
+{
+ if (p->id >= HCI_UART_MAX_PROTO)
+ return -EINVAL;
+
+ if (!hup[p->id])
+ return -EINVAL;
+
+ hup[p->id] = NULL;
+
+ return 0;
+}
+
+static const struct hci_uart_proto *hci_uart_get_proto(unsigned int id)
+{
+ if (id >= HCI_UART_MAX_PROTO)
+ return NULL;
+
+ return hup[id];
+}
+
+static inline void hci_uart_tx_complete(struct hci_uart *hu, int pkt_type)
+{
+ struct hci_dev *hdev = hu->hdev;
+
+ /* Update HCI stat counters */
+ switch (pkt_type) {
+ case HCI_COMMAND_PKT:
+ hdev->stat.cmd_tx++;
+ break;
+
+ case HCI_ACLDATA_PKT:
+ hdev->stat.acl_tx++;
+ break;
+
+ case HCI_SCODATA_PKT:
+ hdev->stat.sco_tx++;
+ break;
+ }
+}
+
+static inline struct sk_buff *hci_uart_dequeue(struct hci_uart *hu)
+{
+ struct sk_buff *skb = hu->tx_skb;
+
+ if (!skb)
+ skb = hu->proto->dequeue(hu);
+ else
+ hu->tx_skb = NULL;
+
+ return skb;
+}
+
+int hci_uart_tx_wakeup(struct hci_uart *hu)
+{
+ if (test_and_set_bit(HCI_UART_SENDING, &hu->tx_state)) {
+ set_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
+ return 0;
+ }
+
+ BT_DBG("");
+
+ schedule_work(&hu->write_work);
+
+ return 0;
+}
+
+static void hci_uart_write_work(struct work_struct *work)
+{
+ struct hci_uart *hu = container_of(work, struct hci_uart, write_work);
+ struct tty_struct *tty = hu->tty;
+ struct hci_dev *hdev = hu->hdev;
+ struct sk_buff *skb;
+
+ /* REVISIT: should we cope with bad skbs or ->write() returning
+ * and error value ?
+ */
+
+restart:
+ clear_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
+
+ while ((skb = hci_uart_dequeue(hu))) {
+ int len;
+
+ set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
+ len = tty->ops->write(tty, skb->data, skb->len);
+ hdev->stat.byte_tx += len;
+
+ skb_pull(skb, len);
+ if (skb->len) {
+ hu->tx_skb = skb;
+ break;
+ }
+
+ hci_uart_tx_complete(hu, bt_cb(skb)->pkt_type);
+ kfree_skb(skb);
+ }
+
+ if (test_bit(HCI_UART_TX_WAKEUP, &hu->tx_state))
+ goto restart;
+
+ clear_bit(HCI_UART_SENDING, &hu->tx_state);
+}
+
+static void hci_uart_init_work(struct work_struct *work)
+{
+ struct hci_uart *hu = container_of(work, struct hci_uart, init_ready);
+ int err;
+
+ if (!test_and_clear_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
+ return;
+
+ err = hci_register_dev(hu->hdev);
+ if (err < 0) {
+ BT_ERR("Can't register HCI device");
+ hci_free_dev(hu->hdev);
+ hu->hdev = NULL;
+ hu->proto->close(hu);
+ }
+
+ set_bit(HCI_UART_REGISTERED, &hu->flags);
+}
+
+int hci_uart_init_ready(struct hci_uart *hu)
+{
+ if (!test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
+ return -EALREADY;
+
+ schedule_work(&hu->init_ready);
+
+ return 0;
+}
+
+/* ------- Interface to HCI layer ------ */
+/* Initialize device */
+static int hci_uart_open(struct hci_dev *hdev)
+{
+ BT_DBG("%s %p", hdev->name, hdev);
+
+ /* Nothing to do for UART driver */
+
+ set_bit(HCI_RUNNING, &hdev->flags);
+
+ return 0;
+}
+
+/* Reset device */
+static int hci_uart_flush(struct hci_dev *hdev)
+{
+ struct hci_uart *hu = hci_get_drvdata(hdev);
+ struct tty_struct *tty = hu->tty;
+
+ BT_DBG("hdev %p tty %p", hdev, tty);
+
+ if (hu->tx_skb) {
+ kfree_skb(hu->tx_skb); hu->tx_skb = NULL;
+ }
+
+ /* Flush any pending characters in the driver and discipline. */
+ tty_ldisc_flush(tty);
+ tty_driver_flush_buffer(tty);
+
+ if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
+ hu->proto->flush(hu);
+
+ return 0;
+}
+
+/* Close device */
+static int hci_uart_close(struct hci_dev *hdev)
+{
+ BT_DBG("hdev %p", hdev);
+
+ if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
+ return 0;
+
+ hci_uart_flush(hdev);
+ hdev->flush = NULL;
+ return 0;
+}
+
+/* Send frames from HCI layer */
+static int hci_uart_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
+{
+ struct hci_uart *hu = hci_get_drvdata(hdev);
+
+ if (!test_bit(HCI_RUNNING, &hdev->flags))
+ return -EBUSY;
+
+ BT_DBG("%s: type %d len %d", hdev->name, bt_cb(skb)->pkt_type, skb->len);
+
+ hu->proto->enqueue(hu, skb);
+
+ hci_uart_tx_wakeup(hu);
+
+ return 0;
+}
+
+static int hci_uart_setup(struct hci_dev *hdev)
+{
+ struct hci_uart *hu = hci_get_drvdata(hdev);
+ struct hci_rp_read_local_version *ver;
+ struct sk_buff *skb;
+
+ if (hu->proto->setup)
+ return hu->proto->setup(hu);
+
+ if (!test_bit(HCI_UART_VND_DETECT, &hu->hdev_flags))
+ return 0;
+
+ skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL,
+ HCI_INIT_TIMEOUT);
+ if (IS_ERR(skb)) {
+ BT_ERR("%s: Reading local version information failed (%ld)",
+ hdev->name, PTR_ERR(skb));
+ return 0;
+ }
+
+ if (skb->len != sizeof(*ver)) {
+ BT_ERR("%s: Event length mismatch for version information",
+ hdev->name);
+ goto done;
+ }
+
+ ver = (struct hci_rp_read_local_version *)skb->data;
+
+ switch (le16_to_cpu(ver->manufacturer)) {
+#ifdef CONFIG_BT_HCIUART_INTEL
+ case 2:
+ hdev->set_bdaddr = btintel_set_bdaddr;
+ btintel_check_bdaddr(hdev);
+ break;
+#endif
+#ifdef CONFIG_BT_HCIUART_BCM
+ case 15:
+ hdev->set_bdaddr = btbcm_set_bdaddr;
+ btbcm_check_bdaddr(hdev);
+ break;
+#endif
+ }
+
+done:
+ kfree_skb(skb);
+ return 0;
+}
+
+/* ------ LDISC part ------ */
+/* hci_uart_tty_open
+ *
+ * Called when line discipline changed to HCI_UART.
+ *
+ * Arguments:
+ * tty pointer to tty info structure
+ * Return Value:
+ * 0 if success, otherwise error code
+ */
+static int hci_uart_tty_open(struct tty_struct *tty)
+{
+ struct hci_uart *hu;
+
+ BT_DBG("tty %p", tty);
+
+ /* Error if the tty has no write op instead of leaving an exploitable
+ hole */
+ if (tty->ops->write == NULL)
+ return -EOPNOTSUPP;
+
+ hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL);
+ if (!hu) {
+ BT_ERR("Can't allocate control structure");
+ return -ENFILE;
+ }
+
+ tty->disc_data = hu;
+ hu->tty = tty;
+ tty->receive_room = 65536;
+
+ INIT_WORK(&hu->init_ready, hci_uart_init_work);
+ INIT_WORK(&hu->write_work, hci_uart_write_work);
+
+ spin_lock_init(&hu->rx_lock);
+
+ /* Flush any pending characters in the driver and line discipline. */
+
+ /* FIXME: why is this needed. Note don't use ldisc_ref here as the
+ open path is before the ldisc is referencable */
+
+ if (tty->ldisc->ops->flush_buffer)
+ tty->ldisc->ops->flush_buffer(tty);
+ tty_driver_flush_buffer(tty);
+
+ return 0;
+}
+
+/* hci_uart_tty_close()
+ *
+ * Called when the line discipline is changed to something
+ * else, the tty is closed, or the tty detects a hangup.
+ */
+static void hci_uart_tty_close(struct tty_struct *tty)
+{
+ struct hci_uart *hu = tty->disc_data;
+ struct hci_dev *hdev;
+
+ BT_DBG("tty %p", tty);
+
+ /* Detach from the tty */
+ tty->disc_data = NULL;
+
+ if (!hu)
+ return;
+
+ hdev = hu->hdev;
+ if (hdev)
+ hci_uart_close(hdev);
+
+ cancel_work_sync(&hu->write_work);
+
+ if (test_and_clear_bit(HCI_UART_PROTO_SET, &hu->flags)) {
+ if (hdev) {
+ if (test_bit(HCI_UART_REGISTERED, &hu->flags))
+ hci_unregister_dev(hdev);
+ hci_free_dev(hdev);
+ }
+ hu->proto->close(hu);
+ }
+
+ kfree(hu);
+}
+
+/* hci_uart_tty_wakeup()
+ *
+ * Callback for transmit wakeup. Called when low level
+ * device driver can accept more send data.
+ *
+ * Arguments: tty pointer to associated tty instance data
+ * Return Value: None
+ */
+static void hci_uart_tty_wakeup(struct tty_struct *tty)
+{
+ struct hci_uart *hu = tty->disc_data;
+
+ BT_DBG("");
+
+ if (!hu)
+ return;
+
+ clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
+
+ if (tty != hu->tty)
+ return;
+
+ if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
+ hci_uart_tx_wakeup(hu);
+}
+
+/* hci_uart_tty_receive()
+ *
+ * Called by tty low level driver when receive data is
+ * available.
+ *
+ * Arguments: tty pointer to tty isntance data
+ * data pointer to received data
+ * flags pointer to flags for data
+ * count count of received data in bytes
+ *
+ * Return Value: None
+ */
+static void hci_uart_tty_receive(struct tty_struct *tty, const u8 *data,
+ char *flags, int count)
+{
+ struct hci_uart *hu = tty->disc_data;
+
+ if (!hu || tty != hu->tty)
+ return;
+
+ if (!test_bit(HCI_UART_PROTO_SET, &hu->flags))
+ return;
+
+ spin_lock(&hu->rx_lock);
+ hu->proto->recv(hu, data, count);
+
+ if (hu->hdev)
+ hu->hdev->stat.byte_rx += count;
+
+ spin_unlock(&hu->rx_lock);
+
+ tty_unthrottle(tty);
+}
+
+static int hci_uart_register_dev(struct hci_uart *hu)
+{
+ struct hci_dev *hdev;
+
+ BT_DBG("");
+
+ /* Initialize and register HCI device */
+ hdev = hci_alloc_dev();
+ if (!hdev) {
+ BT_ERR("Can't allocate HCI device");
+ return -ENOMEM;
+ }
+
+ hu->hdev = hdev;
+
+ hdev->bus = HCI_UART;
+ hci_set_drvdata(hdev, hu);
+
+ hdev->open = hci_uart_open;
+ hdev->close = hci_uart_close;
+ hdev->flush = hci_uart_flush;
+ hdev->send = hci_uart_send_frame;
+ hdev->setup = hci_uart_setup;
+ SET_HCIDEV_DEV(hdev, hu->tty->dev);
+
+ if (test_bit(HCI_UART_RAW_DEVICE, &hu->hdev_flags))
+ set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks);
+
+ if (test_bit(HCI_UART_EXT_CONFIG, &hu->hdev_flags))
+ set_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks);
+
+ if (!test_bit(HCI_UART_RESET_ON_INIT, &hu->hdev_flags))
+ set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
+
+ if (test_bit(HCI_UART_CREATE_AMP, &hu->hdev_flags))
+ hdev->dev_type = HCI_AMP;
+ else
+ hdev->dev_type = HCI_BREDR;
+
+ if (test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
+ return 0;
+
+ if (hci_register_dev(hdev) < 0) {
+ BT_ERR("Can't register HCI device");
+ hci_free_dev(hdev);
+ return -ENODEV;
+ }
+
+ set_bit(HCI_UART_REGISTERED, &hu->flags);
+
+ return 0;
+}
+
+static int hci_uart_set_proto(struct hci_uart *hu, int id)
+{
+ const struct hci_uart_proto *p;
+ int err;
+
+ p = hci_uart_get_proto(id);
+ if (!p)
+ return -EPROTONOSUPPORT;
+
+ err = p->open(hu);
+ if (err)
+ return err;
+
+ hu->proto = p;
+
+ err = hci_uart_register_dev(hu);
+ if (err) {
+ p->close(hu);
+ return err;
+ }
+
+ return 0;
+}
+
+static int hci_uart_set_flags(struct hci_uart *hu, unsigned long flags)
+{
+ unsigned long valid_flags = BIT(HCI_UART_RAW_DEVICE) |
+ BIT(HCI_UART_RESET_ON_INIT) |
+ BIT(HCI_UART_CREATE_AMP) |
+ BIT(HCI_UART_INIT_PENDING) |
+ BIT(HCI_UART_EXT_CONFIG) |
+ BIT(HCI_UART_VND_DETECT);
+
+ if (flags & ~valid_flags)
+ return -EINVAL;
+
+ hu->hdev_flags = flags;
+
+ return 0;
+}
+
+/* hci_uart_tty_ioctl()
+ *
+ * Process IOCTL system call for the tty device.
+ *
+ * Arguments:
+ *
+ * tty pointer to tty instance data
+ * file pointer to open file object for device
+ * cmd IOCTL command code
+ * arg argument for IOCTL call (cmd dependent)
+ *
+ * Return Value: Command dependent
+ */
+static int hci_uart_tty_ioctl(struct tty_struct *tty, struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ struct hci_uart *hu = tty->disc_data;
+ int err = 0;
+
+ BT_DBG("");
+
+ /* Verify the status of the device */
+ if (!hu)
+ return -EBADF;
+
+ switch (cmd) {
+ case HCIUARTSETPROTO:
+ if (!test_and_set_bit(HCI_UART_PROTO_SET, &hu->flags)) {
+ err = hci_uart_set_proto(hu, arg);
+ if (err) {
+ clear_bit(HCI_UART_PROTO_SET, &hu->flags);
+ return err;
+ }
+ } else
+ return -EBUSY;
+ break;
+
+ case HCIUARTGETPROTO:
+ if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
+ return hu->proto->id;
+ return -EUNATCH;
+
+ case HCIUARTGETDEVICE:
+ if (test_bit(HCI_UART_REGISTERED, &hu->flags))
+ return hu->hdev->id;
+ return -EUNATCH;
+
+ case HCIUARTSETFLAGS:
+ if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
+ return -EBUSY;
+ err = hci_uart_set_flags(hu, arg);
+ if (err)
+ return err;
+ break;
+
+ case HCIUARTGETFLAGS:
+ return hu->hdev_flags;
+
+ default:
+ err = n_tty_ioctl_helper(tty, file, cmd, arg);
+ break;
+ }
+
+ return err;
+}
+
+/*
+ * We don't provide read/write/poll interface for user space.
+ */
+static ssize_t hci_uart_tty_read(struct tty_struct *tty, struct file *file,
+ unsigned char __user *buf, size_t nr)
+{
+ return 0;
+}
+
+static ssize_t hci_uart_tty_write(struct tty_struct *tty, struct file *file,
+ const unsigned char *data, size_t count)
+{
+ return 0;
+}
+
+static unsigned int hci_uart_tty_poll(struct tty_struct *tty,
+ struct file *filp, poll_table *wait)
+{
+ return 0;
+}
+
+static int __init hci_uart_init(void)
+{
+ static struct tty_ldisc_ops hci_uart_ldisc;
+ int err;
+
+ BT_INFO("HCI UART driver ver %s", VERSION);
+
+ /* Register the tty discipline */
+
+ memset(&hci_uart_ldisc, 0, sizeof (hci_uart_ldisc));
+ hci_uart_ldisc.magic = TTY_LDISC_MAGIC;
+ hci_uart_ldisc.name = "n_hci";
+ hci_uart_ldisc.open = hci_uart_tty_open;
+ hci_uart_ldisc.close = hci_uart_tty_close;
+ hci_uart_ldisc.read = hci_uart_tty_read;
+ hci_uart_ldisc.write = hci_uart_tty_write;
+ hci_uart_ldisc.ioctl = hci_uart_tty_ioctl;
+ hci_uart_ldisc.poll = hci_uart_tty_poll;
+ hci_uart_ldisc.receive_buf = hci_uart_tty_receive;
+ hci_uart_ldisc.write_wakeup = hci_uart_tty_wakeup;
+ hci_uart_ldisc.owner = THIS_MODULE;
+
+ err = tty_register_ldisc(N_HCI, &hci_uart_ldisc);
+ if (err) {
+ BT_ERR("HCI line discipline registration failed. (%d)", err);
+ return err;
+ }
+
+#ifdef CONFIG_BT_HCIUART_H4
+ h4_init();
+#endif
+#ifdef CONFIG_BT_HCIUART_BCSP
+ bcsp_init();
+#endif
+#ifdef CONFIG_BT_HCIUART_LL
+ ll_init();
+#endif
+#ifdef CONFIG_BT_HCIUART_ATH3K
+ ath_init();
+#endif
+#ifdef CONFIG_BT_HCIUART_3WIRE
+ h5_init();
+#endif
+#ifdef CONFIG_BT_HCIUART_BCM
+ bcm_init();
+#endif
+
+ return 0;
+}
+
+static void __exit hci_uart_exit(void)
+{
+ int err;
+
+#ifdef CONFIG_BT_HCIUART_H4
+ h4_deinit();
+#endif
+#ifdef CONFIG_BT_HCIUART_BCSP
+ bcsp_deinit();
+#endif
+#ifdef CONFIG_BT_HCIUART_LL
+ ll_deinit();
+#endif
+#ifdef CONFIG_BT_HCIUART_ATH3K
+ ath_deinit();
+#endif
+#ifdef CONFIG_BT_HCIUART_3WIRE
+ h5_deinit();
+#endif
+#ifdef CONFIG_BT_HCIUART_BCM
+ bcm_deinit();
+#endif
+
+ /* Release tty registration of line discipline */
+ err = tty_unregister_ldisc(N_HCI);
+ if (err)
+ BT_ERR("Can't unregister HCI line discipline (%d)", err);
+}
+
+module_init(hci_uart_init);
+module_exit(hci_uart_exit);
+
+MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
+MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION);
+MODULE_VERSION(VERSION);
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_LDISC(N_HCI);
Code Review / kvmfornfv.git / blobdiff