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Bluetooth: Implement .activate, .shutdown and .carrier_raised methods 

Implement .activate, .shutdown and .carrier_raised methods of tty_port
to manage the dlc, moving the code from rfcomm_tty_install() and
rfcomm_tty_cleanup() functions.

At the same time the tty .open()/.close() and .hangup() methods are
changed to use the tty_port helpers that properly call the
aforementioned tty_port methods.

Signed-off-by: Gianluca Anzolin <gianluca@sottospazio.it>
Reviewed-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
This commit is contained in:
Gianluca Anzolin 2013-07-29 17:08:11 +02:00 committed by Gustavo Padovan
parent 54b926a143
commit cad348a17e
1 changed files with 47 additions and 70 deletions
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117
net/bluetooth/rfcomm/tty.c
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@ -58,7 +58,6 @@ struct rfcomm_dev {
uint modem_status;
struct rfcomm_dlc *dlc;
wait_queue_head_t wait;
struct device *tty_dev;
@ -104,8 +103,39 @@ static void rfcomm_dev_destruct(struct tty_port *port)
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);
return rfcomm_dlc_open(dev->dlc, &dev->src, &dev->dst, dev->channel);
}
/* 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_get(int id)
@ -228,7 +258,6 @@ static int rfcomm_dev_add(struct rfcomm_dev_req *req, struct rfcomm_dlc *dlc)
tty_port_init(&dev->port);
dev->port.ops = &rfcomm_port_ops;
init_waitqueue_head(&dev->wait);
skb_queue_head_init(&dev->pending);
@ -563,9 +592,12 @@ static void rfcomm_dev_state_change(struct rfcomm_dlc *dlc, int err)
BT_DBG("dlc %p dev %p err %d", dlc, dev, err);
dev->err = err;
wake_up_interruptible(&dev->wait);
if (dlc->state == BT_CONNECTED) {
device_move(dev->tty_dev, rfcomm_get_device(dev),
DPM_ORDER_DEV_AFTER_PARENT);
if (dlc->state == BT_CLOSED) {
wake_up_interruptible(&dev->port.open_wait);
} else if (dlc->state == BT_CLOSED) {
tty = tty_port_tty_get(&dev->port);
if (!tty) {
if (test_bit(RFCOMM_RELEASE_ONHUP, &dev->flags)) {
@ -640,17 +672,10 @@ static void rfcomm_tty_cleanup(struct tty_struct *tty)
{
struct rfcomm_dev *dev = tty->driver_data;
if (dev->tty_dev->parent)
device_move(dev->tty_dev, NULL, DPM_ORDER_DEV_LAST);
/* Close DLC and dettach TTY */
rfcomm_dlc_close(dev->dlc, 0);
clear_bit(RFCOMM_TTY_ATTACHED, &dev->flags);
rfcomm_dlc_lock(dev->dlc);
tty->driver_data = NULL;
dev->port.tty = NULL;
rfcomm_dlc_unlock(dev->dlc);
tty_port_put(&dev->port);
@ -662,7 +687,6 @@ static void rfcomm_tty_cleanup(struct tty_struct *tty)
*/
static int rfcomm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
{
DECLARE_WAITQUEUE(wait, current);
struct rfcomm_dev *dev;
struct rfcomm_dlc *dlc;
int err;
@ -676,72 +700,30 @@ static int rfcomm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
/* Attach TTY and open DLC */
rfcomm_dlc_lock(dlc);
tty->driver_data = dev;
dev->port.tty = tty;
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 < 0)
goto error_no_dlc;
if (err)
rfcomm_tty_cleanup(tty);
err = rfcomm_dlc_open(dlc, &dev->src, &dev->dst, dev->channel);
if (err < 0)
goto error_no_dlc;
/* Wait for DLC to connect */
add_wait_queue(&dev->wait, &wait);
while (1) {
set_current_state(TASK_INTERRUPTIBLE);
if (dlc->state == BT_CLOSED) {
err = -dev->err;
break;
}
if (dlc->state == BT_CONNECTED)
break;
if (signal_pending(current)) {
err = -EINTR;
break;
}
tty_unlock(tty);
schedule();
tty_lock(tty);
}
set_current_state(TASK_RUNNING);
remove_wait_queue(&dev->wait, &wait);
if (err < 0)
goto error_no_connection;
device_move(dev->tty_dev, rfcomm_get_device(dev),
DPM_ORDER_DEV_AFTER_PARENT);
return 0;
error_no_connection:
rfcomm_dlc_close(dlc, err);
error_no_dlc:
clear_bit(RFCOMM_TTY_ATTACHED, &dev->flags);
tty_port_put(&dev->port);
return err;
}
static int rfcomm_tty_open(struct tty_struct *tty, struct file *filp)
{
struct rfcomm_dev *dev = tty->driver_data;
unsigned long flags;
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);
spin_lock_irqsave(&dev->port.lock, flags);
dev->port.count++;
spin_unlock_irqrestore(&dev->port.lock, flags);
err = tty_port_open(&dev->port, tty, filp);
if (err)
return err;
/*
* FIXME: rfcomm should use proper flow control for
@ -758,7 +740,6 @@ static int rfcomm_tty_open(struct tty_struct *tty, struct file *filp)
static void rfcomm_tty_close(struct tty_struct *tty, struct file *filp)
{
struct rfcomm_dev *dev = (struct rfcomm_dev *) tty->driver_data;
unsigned long flags;
if (!dev)
return;
@ -766,14 +747,10 @@ static void rfcomm_tty_close(struct tty_struct *tty, struct file *filp)
BT_DBG("tty %p dev %p dlc %p opened %d", tty, dev, dev->dlc,
dev->port.count);
spin_lock_irqsave(&dev->port.lock, flags);
if (!--dev->port.count) {
spin_unlock_irqrestore(&dev->port.lock, flags);
tty_port_close(&dev->port, tty, filp);
if (test_bit(RFCOMM_TTY_RELEASED, &dev->flags))
tty_port_put(&dev->port);
} else
spin_unlock_irqrestore(&dev->port.lock, flags);
if (test_bit(RFCOMM_TTY_RELEASED, &dev->flags))
tty_port_put(&dev->port);
}
static int rfcomm_tty_write(struct tty_struct *tty, const unsigned char *buf, int count)
@ -1076,7 +1053,7 @@ static void rfcomm_tty_hangup(struct tty_struct *tty)
if (!dev)
return;
rfcomm_tty_flush_buffer(tty);
tty_port_hangup(&dev->port);
if (test_bit(RFCOMM_RELEASE_ONHUP, &dev->flags)) {
if (rfcomm_dev_get(dev->id) == NULL)
@ -1166,7 +1143,7 @@ int __init rfcomm_init_ttys(void)
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 | CLOCAL;
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);