Contributors: 39
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Maksim Krasnyanskiy |
796 |
22.38% |
6 |
5.56% |
| Linus Torvalds |
682 |
19.17% |
4 |
3.70% |
| Marcel Holtmann |
455 |
12.79% |
31 |
28.70% |
| Ilya Faenson |
430 |
12.09% |
1 |
0.93% |
| Johan Hedberg |
240 |
6.75% |
4 |
3.70% |
| Dean Jenkins |
195 |
5.48% |
7 |
6.48% |
| Loic Poulain |
119 |
3.35% |
5 |
4.63% |
| Frederic Danis |
105 |
2.95% |
4 |
3.70% |
| Felipe Balbi |
71 |
2.00% |
1 |
0.93% |
| Hans de Goede |
65 |
1.83% |
2 |
1.85% |
| Jeremy Cline |
61 |
1.71% |
1 |
0.93% |
| Vladis Dronov |
49 |
1.38% |
1 |
0.93% |
| Sascha Hauer |
38 |
1.07% |
1 |
0.93% |
| Ronald Tschalär |
31 |
0.87% |
2 |
1.85% |
| Vignesh Raman |
27 |
0.76% |
1 |
0.93% |
| Alan Cox |
27 |
0.76% |
7 |
6.48% |
| Sebastian Reichel |
18 |
0.51% |
2 |
1.85% |
| David Herrmann |
16 |
0.45% |
3 |
2.78% |
| Ohad Ben-Cohen |
16 |
0.45% |
1 |
0.93% |
| Ben Young Tae Kim |
16 |
0.45% |
1 |
0.93% |
| Suraj Sumangala |
16 |
0.45% |
1 |
0.93% |
| Valentin Ilie |
13 |
0.37% |
1 |
0.93% |
| Al Viro |
9 |
0.25% |
4 |
3.70% |
| Johan Hovold |
9 |
0.25% |
1 |
0.93% |
| Hermes Zhang |
8 |
0.22% |
1 |
0.93% |
| Chan-yeol Park |
8 |
0.22% |
2 |
1.85% |
| Andrei Warkentin |
6 |
0.17% |
1 |
0.93% |
| David Newall |
6 |
0.17% |
1 |
0.93% |
| Andrew Morton |
5 |
0.14% |
1 |
0.93% |
| Jun Nie |
5 |
0.14% |
1 |
0.93% |
| Kefeng Wang |
5 |
0.14% |
1 |
0.93% |
| Fabio Estevam |
2 |
0.06% |
1 |
0.93% |
| Thomas Gleixner |
2 |
0.06% |
1 |
0.93% |
| Szymon Janc |
1 |
0.03% |
1 |
0.93% |
| Alexey Dobriyan |
1 |
0.03% |
1 |
0.93% |
| Deepak Saxena |
1 |
0.03% |
1 |
0.93% |
| Karl Beldan |
1 |
0.03% |
1 |
0.93% |
| Peter Hurley |
1 |
0.03% |
1 |
0.93% |
| Derek Robson |
1 |
0.03% |
1 |
0.93% |
| Total |
3557 |
|
108 |
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
*
* 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>
*/
#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 <linux/firmware.h>
#include <linux/serdev.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) {
percpu_down_read(&hu->proto_lock);
if (test_bit(HCI_UART_PROTO_READY, &hu->flags))
skb = hu->proto->dequeue(hu);
percpu_up_read(&hu->proto_lock);
} else {
hu->tx_skb = NULL;
}
return skb;
}
int hci_uart_tx_wakeup(struct hci_uart *hu)
{
/* This may be called in an IRQ context, so we can't sleep. Therefore
* we try to acquire the lock only, and if that fails we assume the
* tty is being closed because that is the only time the write lock is
* acquired. If, however, at some point in the future the write lock
* is also acquired in other situations, then this must be revisited.
*/
if (!percpu_down_read_trylock(&hu->proto_lock))
return 0;
if (!test_bit(HCI_UART_PROTO_READY, &hu->flags))
goto no_schedule;
if (test_and_set_bit(HCI_UART_SENDING, &hu->tx_state)) {
set_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
goto no_schedule;
}
BT_DBG("");
schedule_work(&hu->write_work);
no_schedule:
percpu_up_read(&hu->proto_lock);
return 0;
}
EXPORT_SYMBOL_GPL(hci_uart_tx_wakeup);
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, hci_skb_pkt_type(skb));
kfree_skb(skb);
}
if (test_bit(HCI_UART_TX_WAKEUP, &hu->tx_state))
goto restart;
clear_bit(HCI_UART_SENDING, &hu->tx_state);
wake_up_bit(&hu->tx_state, HCI_UART_SENDING);
}
void hci_uart_init_work(struct work_struct *work)
{
struct hci_uart *hu = container_of(work, struct hci_uart, init_ready);
int err;
struct hci_dev *hdev;
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");
clear_bit(HCI_UART_PROTO_READY, &hu->flags);
hu->proto->close(hu);
hdev = hu->hdev;
hu->hdev = NULL;
hci_free_dev(hdev);
return;
}
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;
}
int hci_uart_wait_until_sent(struct hci_uart *hu)
{
return wait_on_bit_timeout(&hu->tx_state, HCI_UART_SENDING,
TASK_INTERRUPTIBLE,
msecs_to_jiffies(2000));
}
/* ------- Interface to HCI layer ------ */
/* 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);
percpu_down_read(&hu->proto_lock);
if (test_bit(HCI_UART_PROTO_READY, &hu->flags))
hu->proto->flush(hu);
percpu_up_read(&hu->proto_lock);
return 0;
}
/* Initialize device */
static int hci_uart_open(struct hci_dev *hdev)
{
BT_DBG("%s %p", hdev->name, hdev);
/* Undo clearing this from hci_uart_close() */
hdev->flush = hci_uart_flush;
return 0;
}
/* Close device */
static int hci_uart_close(struct hci_dev *hdev)
{
BT_DBG("hdev %p", hdev);
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);
BT_DBG("%s: type %d len %d", hdev->name, hci_skb_pkt_type(skb),
skb->len);
percpu_down_read(&hu->proto_lock);
if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) {
percpu_up_read(&hu->proto_lock);
return -EUNATCH;
}
hu->proto->enqueue(hu, skb);
percpu_up_read(&hu->proto_lock);
hci_uart_tx_wakeup(hu);
return 0;
}
/* Check the underlying device or tty has flow control support */
bool hci_uart_has_flow_control(struct hci_uart *hu)
{
/* serdev nodes check if the needed operations are present */
if (hu->serdev)
return true;
if (hu->tty->driver->ops->tiocmget && hu->tty->driver->ops->tiocmset)
return true;
return false;
}
/* Flow control or un-flow control the device */
void hci_uart_set_flow_control(struct hci_uart *hu, bool enable)
{
struct tty_struct *tty = hu->tty;
struct ktermios ktermios;
int status;
unsigned int set = 0;
unsigned int clear = 0;
if (hu->serdev) {
serdev_device_set_flow_control(hu->serdev, !enable);
serdev_device_set_rts(hu->serdev, !enable);
return;
}
if (enable) {
/* Disable hardware flow control */
ktermios = tty->termios;
ktermios.c_cflag &= ~CRTSCTS;
status = tty_set_termios(tty, &ktermios);
BT_DBG("Disabling hardware flow control: %s",
status ? "failed" : "success");
/* Clear RTS to prevent the device from sending */
/* Most UARTs need OUT2 to enable interrupts */
status = tty->driver->ops->tiocmget(tty);
BT_DBG("Current tiocm 0x%x", status);
set &= ~(TIOCM_OUT2 | TIOCM_RTS);
clear = ~set;
set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
TIOCM_OUT2 | TIOCM_LOOP;
clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
TIOCM_OUT2 | TIOCM_LOOP;
status = tty->driver->ops->tiocmset(tty, set, clear);
BT_DBG("Clearing RTS: %s", status ? "failed" : "success");
} else {
/* Set RTS to allow the device to send again */
status = tty->driver->ops->tiocmget(tty);
BT_DBG("Current tiocm 0x%x", status);
set |= (TIOCM_OUT2 | TIOCM_RTS);
clear = ~set;
set &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
TIOCM_OUT2 | TIOCM_LOOP;
clear &= TIOCM_DTR | TIOCM_RTS | TIOCM_OUT1 |
TIOCM_OUT2 | TIOCM_LOOP;
status = tty->driver->ops->tiocmset(tty, set, clear);
BT_DBG("Setting RTS: %s", status ? "failed" : "success");
/* Re-enable hardware flow control */
ktermios = tty->termios;
ktermios.c_cflag |= CRTSCTS;
status = tty_set_termios(tty, &ktermios);
BT_DBG("Enabling hardware flow control: %s",
status ? "failed" : "success");
}
}
void hci_uart_set_speeds(struct hci_uart *hu, unsigned int init_speed,
unsigned int oper_speed)
{
hu->init_speed = init_speed;
hu->oper_speed = oper_speed;
}
void hci_uart_set_baudrate(struct hci_uart *hu, unsigned int speed)
{
struct tty_struct *tty = hu->tty;
struct ktermios ktermios;
ktermios = tty->termios;
ktermios.c_cflag &= ~CBAUD;
tty_termios_encode_baud_rate(&ktermios, speed, speed);
/* tty_set_termios() return not checked as it is always 0 */
tty_set_termios(tty, &ktermios);
BT_DBG("%s: New tty speeds: %d/%d", hu->hdev->name,
tty->termios.c_ispeed, tty->termios.c_ospeed);
}
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;
unsigned int speed;
int err;
/* Init speed if any */
if (hu->init_speed)
speed = hu->init_speed;
else if (hu->proto->init_speed)
speed = hu->proto->init_speed;
else
speed = 0;
if (speed)
hci_uart_set_baudrate(hu, speed);
/* Operational speed if any */
if (hu->oper_speed)
speed = hu->oper_speed;
else if (hu->proto->oper_speed)
speed = hu->proto->oper_speed;
else
speed = 0;
if (hu->proto->set_baudrate && speed) {
err = hu->proto->set_baudrate(hu, speed);
if (!err)
hci_uart_set_baudrate(hu, speed);
}
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
default:
break;
}
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;
/* disable alignment support by default */
hu->alignment = 1;
hu->padding = 0;
INIT_WORK(&hu->init_ready, hci_uart_init_work);
INIT_WORK(&hu->write_work, hci_uart_write_work);
percpu_init_rwsem(&hu->proto_lock);
/* Flush any pending characters in the driver */
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);
if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) {
percpu_down_write(&hu->proto_lock);
clear_bit(HCI_UART_PROTO_READY, &hu->flags);
percpu_up_write(&hu->proto_lock);
cancel_work_sync(&hu->write_work);
if (hdev) {
if (test_bit(HCI_UART_REGISTERED, &hu->flags))
hci_unregister_dev(hdev);
hci_free_dev(hdev);
}
hu->proto->close(hu);
}
clear_bit(HCI_UART_PROTO_SET, &hu->flags);
percpu_free_rwsem(&hu->proto_lock);
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_READY, &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;
percpu_down_read(&hu->proto_lock);
if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) {
percpu_up_read(&hu->proto_lock);
return;
}
/* It does not need a lock here as it is already protected by a mutex in
* tty caller
*/
hu->proto->recv(hu, data, count);
percpu_up_read(&hu->proto_lock);
if (hu->hdev)
hu->hdev->stat.byte_rx += count;
tty_unthrottle(tty);
}
static int hci_uart_register_dev(struct hci_uart *hu)
{
struct hci_dev *hdev;
int err;
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);
/* Only when vendor specific setup callback is provided, consider
* the manufacturer information valid. This avoids filling in the
* value for Ericsson when nothing is specified.
*/
if (hu->proto->setup)
hdev->manufacturer = hu->proto->manufacturer;
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_PRIMARY;
/* Only call open() for the protocol after hdev is fully initialized as
* open() (or a timer/workqueue it starts) may attempt to reference it.
*/
err = hu->proto->open(hu);
if (err) {
hu->hdev = NULL;
hci_free_dev(hdev);
return err;
}
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");
hu->proto->close(hu);
hu->hdev = NULL;
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;
hu->proto = p;
err = hci_uart_register_dev(hu);
if (err) {
return err;
}
set_bit(HCI_UART_PROTO_READY, &hu->flags);
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);
} else
err = -EBUSY;
break;
case HCIUARTGETPROTO:
if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
err = hu->proto->id;
else
err = -EUNATCH;
break;
case HCIUARTGETDEVICE:
if (test_bit(HCI_UART_REGISTERED, &hu->flags))
err = hu->hdev->id;
else
err = -EUNATCH;
break;
case HCIUARTSETFLAGS:
if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
err = -EBUSY;
else
err = hci_uart_set_flags(hu, arg);
break;
case HCIUARTGETFLAGS:
err = hu->hdev_flags;
break;
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 __poll_t 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.compat_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_INTEL
intel_init();
#endif
#ifdef CONFIG_BT_HCIUART_BCM
bcm_init();
#endif
#ifdef CONFIG_BT_HCIUART_QCA
qca_init();
#endif
#ifdef CONFIG_BT_HCIUART_AG6XX
ag6xx_init();
#endif
#ifdef CONFIG_BT_HCIUART_MRVL
mrvl_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_INTEL
intel_deinit();
#endif
#ifdef CONFIG_BT_HCIUART_BCM
bcm_deinit();
#endif
#ifdef CONFIG_BT_HCIUART_QCA
qca_deinit();
#endif
#ifdef CONFIG_BT_HCIUART_AG6XX
ag6xx_deinit();
#endif
#ifdef CONFIG_BT_HCIUART_MRVL
mrvl_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);