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tty_port: Add a port level carrier detect operation

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This is the first step to generalising the various pieces of waiting logic
duplicated in all sorts of serial drivers.

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alan Cox 2009-01-02 13:45:05 +00:00 committed by Linus Torvalds
parent c9b3976e3f
commit 31f35939d1
19 changed files with 428 additions and 240 deletions
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61
drivers/char/esp.c
View file

@ -2054,6 +2054,15 @@ static void esp_hangup(struct tty_struct *tty)
wake_up_interruptible(&info->port.open_wait);
}
static int esp_carrier_raised(struct tty_port *port)
{
struct esp_struct *info = container_of(port, struct esp_struct, port);
serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
if (serial_in(info, UART_ESI_STAT2) & UART_MSR_DCD)
return 1;
return 0;
}
/*
* ------------------------------------------------------------
* esp_open() and friends
@ -2066,17 +2075,19 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp,
int retval;
int do_clocal = 0;
unsigned long flags;
int cd;
struct tty_port *port = &info->port;
/*
* If the device is in the middle of being closed, then block
* until it's done, and then try again.
*/
if (tty_hung_up_p(filp) ||
(info->port.flags & ASYNC_CLOSING)) {
if (info->port.flags & ASYNC_CLOSING)
interruptible_sleep_on(&info->port.close_wait);
(port->flags & ASYNC_CLOSING)) {
if (port->flags & ASYNC_CLOSING)
interruptible_sleep_on(&port->close_wait);
#ifdef SERIAL_DO_RESTART
if (info->port.flags & ASYNC_HUP_NOTIFY)
if (port->flags & ASYNC_HUP_NOTIFY)
return -EAGAIN;
else
return -ERESTARTSYS;
@ -2091,7 +2102,7 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp,
*/
if ((filp->f_flags & O_NONBLOCK) ||
(tty->flags & (1 << TTY_IO_ERROR))) {
info->port.flags |= ASYNC_NORMAL_ACTIVE;
port->flags |= ASYNC_NORMAL_ACTIVE;
return 0;
}
@ -2101,20 +2112,20 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp,
/*
* Block waiting for the carrier detect and the line to become
* free (i.e., not in use by the callout). While we are in
* this loop, info->port.count is dropped by one, so that
* this loop, port->count is dropped by one, so that
* rs_close() knows when to free things. We restore it upon
* exit, either normal or abnormal.
*/
retval = 0;
add_wait_queue(&info->port.open_wait, &wait);
add_wait_queue(&port->open_wait, &wait);
#ifdef SERIAL_DEBUG_OPEN
printk(KERN_DEBUG "block_til_ready before block: ttys%d, count = %d\n",
info->line, info->port.count);
info->line, port->count);
#endif
spin_lock_irqsave(&info->lock, flags);
if (!tty_hung_up_p(filp))
info->port.count--;
info->port.blocked_open++;
port->count--;
port->blocked_open++;
while (1) {
if ((tty->termios->c_cflag & CBAUD)) {
unsigned int scratch;
@ -2129,9 +2140,9 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp,
}
set_current_state(TASK_INTERRUPTIBLE);
if (tty_hung_up_p(filp) ||
!(info->port.flags & ASYNC_INITIALIZED)) {
!(port->flags & ASYNC_INITIALIZED)) {
#ifdef SERIAL_DO_RESTART
if (info->port.flags & ASYNC_HUP_NOTIFY)
if (port->flags & ASYNC_HUP_NOTIFY)
retval = -EAGAIN;
else
retval = -ERESTARTSYS;
@ -2141,11 +2152,9 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp,
break;
}
serial_out(info, UART_ESI_CMD1, ESI_GET_UART_STAT);
if (serial_in(info, UART_ESI_STAT2) & UART_MSR_DCD)
do_clocal = 1;
cd = tty_port_carrier_raised(port);
if (!(info->port.flags & ASYNC_CLOSING) &&
if (!(port->flags & ASYNC_CLOSING) &&
(do_clocal))
break;
if (signal_pending(current)) {
@ -2154,25 +2163,25 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp,
}
#ifdef SERIAL_DEBUG_OPEN
printk(KERN_DEBUG "block_til_ready blocking: ttys%d, count = %d\n",
info->line, info->port.count);
info->line, port->count);
#endif
spin_unlock_irqrestore(&info->lock, flags);
schedule();
spin_lock_irqsave(&info->lock, flags);
}
set_current_state(TASK_RUNNING);
remove_wait_queue(&info->port.open_wait, &wait);
remove_wait_queue(&port->open_wait, &wait);
if (!tty_hung_up_p(filp))
info->port.count++;
info->port.blocked_open--;
port->count++;
port->blocked_open--;
spin_unlock_irqrestore(&info->lock, flags);
#ifdef SERIAL_DEBUG_OPEN
printk(KERN_DEBUG "block_til_ready after blocking: ttys%d, count = %d\n",
info->line, info->port.count);
info->line, port->count);
#endif
if (retval)
return retval;
info->port.flags |= ASYNC_NORMAL_ACTIVE;
port->flags |= ASYNC_NORMAL_ACTIVE;
return 0;
}
@ -2329,6 +2338,10 @@ static const struct tty_operations esp_ops = {
.tiocmset = esp_tiocmset,
};
static const struct tty_port_operations esp_port_ops = {
.esp_carrier_raised,
};
/*
* The serial driver boot-time initialization code!
*/
@ -2415,6 +2428,8 @@ static int __init espserial_init(void)
offset = 0;
do {
tty_port_init(&info->port);
info->port.ops = &esp_port_ops;
info->io_port = esp[i] + offset;
info->irq = irq[i];
info->line = (i * 8) + (offset / 8);
@ -2437,8 +2452,6 @@ static int __init espserial_init(void)
info->config.flow_off = flow_off;
info->config.pio_threshold = pio_threshold;
info->next_port = ports;
init_waitqueue_head(&info->port.open_wait);
init_waitqueue_head(&info->port.close_wait);
init_waitqueue_head(&info->delta_msr_wait);
init_waitqueue_head(&info->break_wait);
ports = info;

43
drivers/char/generic_serial.c
View file

@ -397,7 +397,8 @@ void gs_hangup(struct tty_struct *tty)
int gs_block_til_ready(void *port_, struct file * filp)
{
struct gs_port *port = port_;
struct gs_port *gp = port_;
struct tty_port *port = &gp->port;
DECLARE_WAITQUEUE(wait, current);
int retval;
int do_clocal = 0;
@ -409,16 +410,16 @@ int gs_block_til_ready(void *port_, struct file * filp)
if (!port) return 0;
tty = port->port.tty;
tty = port->tty;
gs_dprintk (GS_DEBUG_BTR, "Entering gs_block_till_ready.\n");
/*
* If the device is in the middle of being closed, then block
* until it's done, and then try again.
*/
if (tty_hung_up_p(filp) || port->port.flags & ASYNC_CLOSING) {
interruptible_sleep_on(&port->port.close_wait);
if (port->port.flags & ASYNC_HUP_NOTIFY)
if (tty_hung_up_p(filp) || port->flags & ASYNC_CLOSING) {
interruptible_sleep_on(&port->close_wait);
if (port->flags & ASYNC_HUP_NOTIFY)
return -EAGAIN;
else
return -ERESTARTSYS;
@ -432,7 +433,7 @@ int gs_block_til_ready(void *port_, struct file * filp)
*/
if ((filp->f_flags & O_NONBLOCK) ||
(tty->flags & (1 << TTY_IO_ERROR))) {
port->port.flags |= ASYNC_NORMAL_ACTIVE;
port->flags |= ASYNC_NORMAL_ACTIVE;
return 0;
}
@ -444,34 +445,34 @@ int gs_block_til_ready(void *port_, struct file * filp)
/*
* Block waiting for the carrier detect and the line to become
* free (i.e., not in use by the callout). While we are in
* this loop, port->port.count is dropped by one, so that
* this loop, port->count is dropped by one, so that
* rs_close() knows when to free things. We restore it upon
* exit, either normal or abnormal.
*/
retval = 0;
add_wait_queue(&port->port.open_wait, &wait);
add_wait_queue(&port->open_wait, &wait);
gs_dprintk (GS_DEBUG_BTR, "after add waitq.\n");
spin_lock_irqsave(&port->driver_lock, flags);
spin_lock_irqsave(&gp->driver_lock, flags);
if (!tty_hung_up_p(filp)) {
port->port.count--;
port->count--;
}
spin_unlock_irqrestore(&port->driver_lock, flags);
port->port.blocked_open++;
spin_unlock_irqrestore(&gp->driver_lock, flags);
port->blocked_open++;
while (1) {
CD = port->rd->get_CD (port);
CD = tty_port_carrier_raised(port);
gs_dprintk (GS_DEBUG_BTR, "CD is now %d.\n", CD);
set_current_state (TASK_INTERRUPTIBLE);
if (tty_hung_up_p(filp) ||
!(port->port.flags & ASYNC_INITIALIZED)) {
if (port->port.flags & ASYNC_HUP_NOTIFY)
!(port->flags & ASYNC_INITIALIZED)) {
if (port->flags & ASYNC_HUP_NOTIFY)
retval = -EAGAIN;
else
retval = -ERESTARTSYS;
break;
}
if (!(port->port.flags & ASYNC_CLOSING) &&
if (!(port->flags & ASYNC_CLOSING) &&
(do_clocal || CD))
break;
gs_dprintk (GS_DEBUG_BTR, "signal_pending is now: %d (%lx)\n",
@ -483,17 +484,17 @@ int gs_block_til_ready(void *port_, struct file * filp)
schedule();
}
gs_dprintk (GS_DEBUG_BTR, "Got out of the loop. (%d)\n",
port->port.blocked_open);
port->blocked_open);
set_current_state (TASK_RUNNING);
remove_wait_queue(&port->port.open_wait, &wait);
remove_wait_queue(&port->open_wait, &wait);
if (!tty_hung_up_p(filp)) {
port->port.count++;
port->count++;
}
port->port.blocked_open--;
port->blocked_open--;
if (retval)
return retval;
port->port.flags |= ASYNC_NORMAL_ACTIVE;
port->flags |= ASYNC_NORMAL_ACTIVE;
func_exit ();
return 0;
}

53
drivers/char/isicom.c
View file

@ -830,20 +830,28 @@ static int isicom_setup_port(struct tty_struct *tty)
return 0;
}
static int block_til_ready(struct tty_struct *tty, struct file *filp,
struct isi_port *port)
static int isicom_carrier_raised(struct tty_port *port)
{
struct isi_board *card = port->card;
struct isi_port *ip = container_of(port, struct isi_port, port);
return (ip->status & ISI_DCD)?1 : 0;
}
static int block_til_ready(struct tty_struct *tty, struct file *filp,
struct isi_port *ip)
{
struct isi_board *card = ip->card;
struct tty_port *port = &ip->port;
int do_clocal = 0, retval;
unsigned long flags;
DECLARE_WAITQUEUE(wait, current);
int cd;
/* block if port is in the process of being closed */
if (tty_hung_up_p(filp) || port->port.flags & ASYNC_CLOSING) {
if (tty_hung_up_p(filp) || port->flags & ASYNC_CLOSING) {
pr_dbg("block_til_ready: close in progress.\n");
interruptible_sleep_on(&port->port.close_wait);
if (port->port.flags & ASYNC_HUP_NOTIFY)
interruptible_sleep_on(&port->close_wait);
if (port->flags & ASYNC_HUP_NOTIFY)
return -EAGAIN;
else
return -ERESTARTSYS;
@ -854,7 +862,7 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp,
if ((filp->f_flags & O_NONBLOCK) ||
(tty->flags & (1 << TTY_IO_ERROR))) {
pr_dbg("block_til_ready: non-block mode.\n");
port->port.flags |= ASYNC_NORMAL_ACTIVE;
port->flags |= ASYNC_NORMAL_ACTIVE;
return 0;
}
@ -864,29 +872,29 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp,
/* block waiting for DCD to be asserted, and while
callout dev is busy */
retval = 0;
add_wait_queue(&port->port.open_wait, &wait);
add_wait_queue(&port->open_wait, &wait);
spin_lock_irqsave(&card->card_lock, flags);
if (!tty_hung_up_p(filp))
port->port.count--;
port->port.blocked_open++;
port->count--;
port->blocked_open++;
spin_unlock_irqrestore(&card->card_lock, flags);
while (1) {
raise_dtr_rts(port);
raise_dtr_rts(ip);
set_current_state(TASK_INTERRUPTIBLE);
if (tty_hung_up_p(filp) || !(port->port.flags & ASYNC_INITIALIZED)) {
if (port->port.flags & ASYNC_HUP_NOTIFY)
if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)) {
if (port->flags & ASYNC_HUP_NOTIFY)
retval = -EAGAIN;
else
retval = -ERESTARTSYS;
break;
}
if (!(port->port.flags & ASYNC_CLOSING) &&
(do_clocal || (port->status & ISI_DCD))) {
cd = tty_port_carrier_raised(port);
if (!(port->flags & ASYNC_CLOSING) &&
(do_clocal || cd))
break;
}
if (signal_pending(current)) {
retval = -ERESTARTSYS;
break;
@ -894,15 +902,15 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp,
schedule();
}
set_current_state(TASK_RUNNING);
remove_wait_queue(&port->port.open_wait, &wait);
remove_wait_queue(&port->open_wait, &wait);
spin_lock_irqsave(&card->card_lock, flags);
if (!tty_hung_up_p(filp))
port->port.count++;
port->port.blocked_open--;
port->count++;
port->blocked_open--;
spin_unlock_irqrestore(&card->card_lock, flags);
if (retval)
return retval;
port->port.flags |= ASYNC_NORMAL_ACTIVE;
port->flags |= ASYNC_NORMAL_ACTIVE;
return 0;
}
@ -1452,6 +1460,10 @@ static const struct tty_operations isicom_ops = {
.break_ctl = isicom_send_break,
};
static const struct tty_port_operations isicom_port_ops = {
.carrier_raised = isicom_carrier_raised,
};
static int __devinit reset_card(struct pci_dev *pdev,
const unsigned int card, unsigned int *signature)
{
@ -1794,6 +1806,7 @@ static int __init isicom_init(void)
spin_lock_init(&isi_card[idx].card_lock);
for (channel = 0; channel < 16; channel++, port++) {
tty_port_init(&port->port);
port->port.ops = &isicom_port_ops;
port->magic = ISICOM_MAGIC;
port->card = &isi_card[idx];
port->channel = channel;

28
drivers/char/istallion.c
View file

@ -151,7 +151,7 @@ static char *stli_drvversion = "5.6.0";
static char *stli_serialname = "ttyE";
static struct tty_driver *stli_serial;
static const struct tty_port_operations stli_port_ops;
#define STLI_TXBUFSIZE 4096
@ -1183,6 +1183,12 @@ static int stli_setport(struct tty_struct *tty)
/*****************************************************************************/
static int stli_carrier_raised(struct tty_port *port)
{
struct stliport *portp = container_of(port, struct stliport, port);
return (portp->sigs & TIOCM_CD) ? 1 : 0;
}
/*
* Possibly need to wait for carrier (DCD signal) to come high. Say
* maybe because if we are clocal then we don't need to wait...
@ -1193,6 +1199,7 @@ static int stli_waitcarrier(struct tty_struct *tty, struct stlibrd *brdp,
{
unsigned long flags;
int rc, doclocal;
struct tty_port *port = &portp->port;
rc = 0;
doclocal = 0;
@ -1203,7 +1210,7 @@ static int stli_waitcarrier(struct tty_struct *tty, struct stlibrd *brdp,
spin_lock_irqsave(&stli_lock, flags);
portp->openwaitcnt++;
if (! tty_hung_up_p(filp))
portp->port.count--;
port->count--;
spin_unlock_irqrestore(&stli_lock, flags);
for (;;) {
@ -1212,27 +1219,27 @@ static int stli_waitcarrier(struct tty_struct *tty, struct stlibrd *brdp,
&portp->asig, sizeof(asysigs_t), 0)) < 0)
break;
if (tty_hung_up_p(filp) ||
((portp->port.flags & ASYNC_INITIALIZED) == 0)) {
if (portp->port.flags & ASYNC_HUP_NOTIFY)
((port->flags & ASYNC_INITIALIZED) == 0)) {
if (port->flags & ASYNC_HUP_NOTIFY)
rc = -EBUSY;
else
rc = -ERESTARTSYS;
break;
}
if (((portp->port.flags & ASYNC_CLOSING) == 0) &&
(doclocal || (portp->sigs & TIOCM_CD))) {
if (((port->flags & ASYNC_CLOSING) == 0) &&
(doclocal || tty_port_carrier_raised(port))) {
break;
}
if (signal_pending(current)) {
rc = -ERESTARTSYS;
break;
}
interruptible_sleep_on(&portp->port.open_wait);
interruptible_sleep_on(&port->open_wait);
}
spin_lock_irqsave(&stli_lock, flags);
if (! tty_hung_up_p(filp))
portp->port.count++;
port->count++;
portp->openwaitcnt--;
spin_unlock_irqrestore(&stli_lock, flags);
@ -2696,6 +2703,7 @@ static int stli_initports(struct stlibrd *brdp)
continue;
}
tty_port_init(&portp->port);
portp->port.ops = &stli_port_ops;
portp->magic = STLI_PORTMAGIC;
portp->portnr = i;
portp->brdnr = brdp->brdnr;
@ -4518,6 +4526,10 @@ static const struct tty_operations stli_ops = {
.tiocmset = stli_tiocmset,
};
static const struct tty_port_operations stli_port_ops = {
.carrier_raised = stli_carrier_raised,
};
/*****************************************************************************/
/*
* Loadable module initialization stuff.

26
drivers/char/moxa.c
View file

@ -206,6 +206,7 @@ static void moxa_poll(unsigned long);
static void moxa_set_tty_param(struct tty_struct *, struct ktermios *);
static void moxa_setup_empty_event(struct tty_struct *);
static void moxa_shut_down(struct tty_struct *);
static int moxa_carrier_raised(struct tty_port *);
/*
* moxa board interface functions:
*/
@ -405,6 +406,10 @@ static const struct tty_operations moxa_ops = {
.tiocmset = moxa_tiocmset,
};
static const struct tty_port_operations moxa_port_ops = {
.carrier_raised = moxa_carrier_raised,
};
static struct tty_driver *moxaDriver;
static DEFINE_TIMER(moxaTimer, moxa_poll, 0, 0);
static DEFINE_SPINLOCK(moxa_lock);
@ -826,6 +831,7 @@ static int moxa_init_board(struct moxa_board_conf *brd, struct device *dev)
for (i = 0, p = brd->ports; i < MAX_PORTS_PER_BOARD; i++, p++) {
tty_port_init(&p->port);
p->port.ops = &moxa_port_ops;
p->type = PORT_16550A;
p->cflag = B9600 | CS8 | CREAD | CLOCAL | HUPCL;
}
@ -1115,15 +1121,27 @@ static void moxa_close_port(struct tty_struct *tty)
tty_port_tty_set(&ch->port, NULL);
}
static int moxa_carrier_raised(struct tty_port *port)
{
struct moxa_port *ch = container_of(port, struct moxa_port, port);
int dcd;
spin_lock_bh(&moxa_lock);
dcd = ch->DCDState;
spin_unlock_bh(&moxa_lock);
return dcd;
}
static int moxa_block_till_ready(struct tty_struct *tty, struct file *filp,
struct moxa_port *ch)
{
struct tty_port *port = &ch->port;
DEFINE_WAIT(wait);
int retval = 0;
u8 dcd;
while (1) {
prepare_to_wait(&ch->port.open_wait, &wait, TASK_INTERRUPTIBLE);
prepare_to_wait(&port->open_wait, &wait, TASK_INTERRUPTIBLE);
if (tty_hung_up_p(filp)) {
#ifdef SERIAL_DO_RESTART
retval = -ERESTARTSYS;
@ -1132,9 +1150,7 @@ static int moxa_block_till_ready(struct tty_struct *tty, struct file *filp,
#endif
break;
}
spin_lock_bh(&moxa_lock);
dcd = ch->DCDState;
spin_unlock_bh(&moxa_lock);
dcd = tty_port_carrier_raised(port);
if (dcd)
break;
@ -1144,7 +1160,7 @@ static int moxa_block_till_ready(struct tty_struct *tty, struct file *filp,
}
schedule();
}
finish_wait(&ch->port.open_wait, &wait);
finish_wait(&port->open_wait, &wait);
return retval;
}

54
drivers/char/mxser.c
View file

@ -541,13 +541,21 @@ static unsigned char mxser_get_msr(int baseaddr, int mode, int port)
return status;
}
static int mxser_carrier_raised(struct tty_port *port)
{
struct mxser_port *mp = container_of(port, struct mxser_port, port);
return (inb(mp->ioaddr + UART_MSR) & UART_MSR_DCD)?1:0;
}
static int mxser_block_til_ready(struct tty_struct *tty, struct file *filp,
struct mxser_port *port)
struct mxser_port *mp)
{
DECLARE_WAITQUEUE(wait, current);
int retval;
int do_clocal = 0;
unsigned long flags;
int cd;
struct tty_port *port = &mp->port;
/*
* If non-blocking mode is set, or the port is not enabled,
@ -555,7 +563,7 @@ static int mxser_block_til_ready(struct tty_struct *tty, struct file *filp,
*/
if ((filp->f_flags & O_NONBLOCK) ||
test_bit(TTY_IO_ERROR, &tty->flags)) {
port->port.flags |= ASYNC_NORMAL_ACTIVE;
port->flags |= ASYNC_NORMAL_ACTIVE;
return 0;
}
@ -565,34 +573,33 @@ static int mxser_block_til_ready(struct tty_struct *tty, struct file *filp,
/*
* Block waiting for the carrier detect and the line to become
* free (i.e., not in use by the callout). While we are in
* this loop, port->port.count is dropped by one, so that
* this loop, port->count is dropped by one, so that
* mxser_close() knows when to free things. We restore it upon
* exit, either normal or abnormal.
*/
retval = 0;
add_wait_queue(&port->port.open_wait, &wait);
add_wait_queue(&port->open_wait, &wait);
spin_lock_irqsave(&port->slock, flags);
spin_lock_irqsave(&mp->slock, flags);
if (!tty_hung_up_p(filp))
port->port.count--;
spin_unlock_irqrestore(&port->slock, flags);
port->port.blocked_open++;
port->count--;
spin_unlock_irqrestore(&mp->slock, flags);
port->blocked_open++;
while (1) {
spin_lock_irqsave(&port->slock, flags);
outb(inb(port->ioaddr + UART_MCR) |
UART_MCR_DTR | UART_MCR_RTS, port->ioaddr + UART_MCR);
spin_unlock_irqrestore(&port->slock, flags);
spin_lock_irqsave(&mp->slock, flags);
outb(inb(mp->ioaddr + UART_MCR) |
UART_MCR_DTR | UART_MCR_RTS, mp->ioaddr + UART_MCR);
spin_unlock_irqrestore(&mp->slock, flags);
set_current_state(TASK_INTERRUPTIBLE);
if (tty_hung_up_p(filp) || !(port->port.flags & ASYNC_INITIALIZED)) {
if (port->port.flags & ASYNC_HUP_NOTIFY)
if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)) {
if (port->flags & ASYNC_HUP_NOTIFY)
retval = -EAGAIN;
else
retval = -ERESTARTSYS;
break;
}
if (!(port->port.flags & ASYNC_CLOSING) &&
(do_clocal ||
(inb(port->ioaddr + UART_MSR) & UART_MSR_DCD)))
cd = tty_port_carrier_raised(port);
if (!(port->flags & ASYNC_CLOSING) && (do_clocal || cd))
break;
if (signal_pending(current)) {
retval = -ERESTARTSYS;
@ -601,13 +608,13 @@ static int mxser_block_til_ready(struct tty_struct *tty, struct file *filp,
schedule();
}
set_current_state(TASK_RUNNING);
remove_wait_queue(&port->port.open_wait, &wait);
remove_wait_queue(&port->open_wait, &wait);
if (!tty_hung_up_p(filp))
port->port.count++;
port->port.blocked_open--;
port->count++;
port->blocked_open--;
if (retval)
return retval;
port->port.flags |= ASYNC_NORMAL_ACTIVE;
port->flags |= ASYNC_NORMAL_ACTIVE;
return 0;
}
@ -2449,6 +2456,10 @@ static const struct tty_operations mxser_ops = {
.tiocmset = mxser_tiocmset,
};
struct tty_port_operations mxser_port_ops = {
.carrier_raised = mxser_carrier_raised,
};
/*
* The MOXA Smartio/Industio serial driver boot-time initialization code!
*/
@ -2482,6 +2493,7 @@ static int __devinit mxser_initbrd(struct mxser_board *brd,
for (i = 0; i < brd->info->nports; i++) {
info = &brd->ports[i];
tty_port_init(&info->port);
info->port.ops = &mxser_port_ops;
info->board = brd;
info->stop_rx = 0;
info->ldisc_stop_rx = 0;

18
drivers/char/rio/rio_linux.c
View file

@ -173,7 +173,7 @@ static void rio_disable_tx_interrupts(void *ptr);
static void rio_enable_tx_interrupts(void *ptr);
static void rio_disable_rx_interrupts(void *ptr);
static void rio_enable_rx_interrupts(void *ptr);
static int rio_get_CD(void *ptr);
static int rio_carrier_raised(struct tty_port *port);
static void rio_shutdown_port(void *ptr);
static int rio_set_real_termios(void *ptr);
static void rio_hungup(void *ptr);
@ -224,7 +224,6 @@ static struct real_driver rio_real_driver = {
rio_enable_tx_interrupts,
rio_disable_rx_interrupts,
rio_enable_rx_interrupts,
rio_get_CD,
rio_shutdown_port,
rio_set_real_termios,
rio_chars_in_buffer,
@ -476,9 +475,9 @@ static void rio_enable_rx_interrupts(void *ptr)
/* Jeez. Isn't this simple? */
static int rio_get_CD(void *ptr)
static int rio_carrier_raised(struct tty_port *port)
{
struct Port *PortP = ptr;
struct Port *PortP = container_of(port, struct Port, gs.port);
int rv;
func_enter();
@ -806,7 +805,9 @@ static void *ckmalloc(int size)
return p;
}
static const struct tty_port_operations rio_port_ops = {
.carrier_raised = rio_carrier_raised,
};
static int rio_init_datastructures(void)
{
@ -842,17 +843,14 @@ static int rio_init_datastructures(void)
goto free6;
}
rio_dprintk(RIO_DEBUG_INIT, "initing port %d (%d)\n", i, port->Mapped);
tty_port_init(&port->gs.port);
port->gs.port.ops = &rio_port_ops;
port->PortNum = i;
port->gs.magic = RIO_MAGIC;
port->gs.close_delay = HZ / 2;
port->gs.closing_wait = 30 * HZ;
port->gs.rd = &rio_real_driver;
spin_lock_init(&port->portSem);
/*
* Initializing wait queue
*/
init_waitqueue_head(&port->gs.port.open_wait);
init_waitqueue_head(&port->gs.port.close_wait);
}
#else
/* We could postpone initializing them to when they are configured. */

65
drivers/char/riscom8.c
View file

@ -857,23 +857,40 @@ static void rc_shutdown_port(struct tty_struct *tty,
rc_shutdown_board(bp);
}
static int carrier_raised(struct tty_port *port)
{
struct riscom_port *p = container_of(port, struct riscom_port, port);
struct riscom_board *bp = port_Board(p);
unsigned long flags;
int CD;
spin_lock_irqsave(&riscom_lock, flags);
rc_out(bp, CD180_CAR, port_No(p));
CD = rc_in(bp, CD180_MSVR) & MSVR_CD;
rc_out(bp, CD180_MSVR, MSVR_RTS);
bp->DTR &= ~(1u << port_No(p));
rc_out(bp, RC_DTR, bp->DTR);
spin_unlock_irqrestore(&riscom_lock, flags);
return CD;
}
static int block_til_ready(struct tty_struct *tty, struct file *filp,
struct riscom_port *port)
struct riscom_port *rp)
{
DECLARE_WAITQUEUE(wait, current);
struct riscom_board *bp = port_Board(port);
int retval;
int do_clocal = 0;
int CD;
unsigned long flags;
struct tty_port *port = &rp->port;
/*
* If the device is in the middle of being closed, then block
* until it's done, and then try again.
*/
if (tty_hung_up_p(filp) || port->port.flags & ASYNC_CLOSING) {
interruptible_sleep_on(&port->port.close_wait);
if (port->port.flags & ASYNC_HUP_NOTIFY)
if (tty_hung_up_p(filp) || port->flags & ASYNC_CLOSING) {
interruptible_sleep_on(&port->close_wait);
if (port->flags & ASYNC_HUP_NOTIFY)
return -EAGAIN;
else
return -ERESTARTSYS;
@ -885,7 +902,7 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp,
*/
if ((filp->f_flags & O_NONBLOCK) ||
(tty->flags & (1 << TTY_IO_ERROR))) {
port->port.flags |= ASYNC_NORMAL_ACTIVE;
port->flags |= ASYNC_NORMAL_ACTIVE;
return 0;
}
@ -900,37 +917,29 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp,
* exit, either normal or abnormal.
*/
retval = 0;
add_wait_queue(&port->port.open_wait, &wait);
add_wait_queue(&port->open_wait, &wait);
spin_lock_irqsave(&riscom_lock, flags);
if (!tty_hung_up_p(filp))
port->port.count--;
port->count--;
spin_unlock_irqrestore(&riscom_lock, flags);
port->port.blocked_open++;
port->blocked_open++;
while (1) {
spin_lock_irqsave(&riscom_lock, flags);
rc_out(bp, CD180_CAR, port_No(port));
CD = rc_in(bp, CD180_MSVR) & MSVR_CD;
rc_out(bp, CD180_MSVR, MSVR_RTS);
bp->DTR &= ~(1u << port_No(port));
rc_out(bp, RC_DTR, bp->DTR);
spin_unlock_irqrestore(&riscom_lock, flags);
CD = tty_port_carrier_raised(port);
set_current_state(TASK_INTERRUPTIBLE);
if (tty_hung_up_p(filp) ||
!(port->port.flags & ASYNC_INITIALIZED)) {
if (port->port.flags & ASYNC_HUP_NOTIFY)
!(port->flags & ASYNC_INITIALIZED)) {
if (port->flags & ASYNC_HUP_NOTIFY)
retval = -EAGAIN;
else
retval = -ERESTARTSYS;
break;
}
if (!(port->port.flags & ASYNC_CLOSING) &&
if (!(port->flags & ASYNC_CLOSING) &&
(do_clocal || CD))
break;
if (signal_pending(current)) {
@ -940,14 +949,14 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp,
schedule();
}
__set_current_state(TASK_RUNNING);
remove_wait_queue(&port->port.open_wait, &wait);
remove_wait_queue(&port->open_wait, &wait);
if (!tty_hung_up_p(filp))
port->port.count++;
port->port.blocked_open--;
port->count++;
port->blocked_open--;
if (retval)
return retval;
port->port.flags |= ASYNC_NORMAL_ACTIVE;
port->flags |= ASYNC_NORMAL_ACTIVE;
return 0;
}
@ -1510,6 +1519,11 @@ static const struct tty_operations riscom_ops = {
.break_ctl = rc_send_break,
};
static const struct tty_port_operations riscom_port_ops = {
.carrier_raised = carrier_raised,
};
static int __init rc_init_drivers(void)
{
int error;
@ -1541,6 +1555,7 @@ static int __init rc_init_drivers(void)
memset(rc_port, 0, sizeof(rc_port));
for (i = 0; i < RC_NPORT * RC_NBOARD; i++) {
tty_port_init(&rc_port[i].port);
rc_port[i].port.ops = &riscom_port_ops;
rc_port[i].magic = RISCOM8_MAGIC;
}
return 0;

40
drivers/char/rocket.c
View file

@ -135,6 +135,7 @@ static int rcktpt_type[NUM_BOARDS];
static int is_PCI[NUM_BOARDS];
static rocketModel_t rocketModel[NUM_BOARDS];
static int max_board;
static const struct tty_port_operations rocket_port_ops;
/*
* The following arrays define the interrupt bits corresponding to each AIOP.
@ -649,9 +650,8 @@ static void init_r_port(int board, int aiop, int chan, struct pci_dev *pci_dev)
info->board = board;
info->aiop = aiop;
info->chan = chan;
info->port.closing_wait = 3000;
info->port.close_delay = 50;
init_waitqueue_head(&info->port.open_wait);
tty_port_init(&info->port);
info->port.ops = &rocket_port_ops;
init_completion(&info->close_wait);
info->flags &= ~ROCKET_MODE_MASK;
switch (pc104[board][line]) {
@ -864,11 +864,18 @@ static void configure_r_port(struct r_port *info,
}
}
static int carrier_raised(struct tty_port *port)
{
struct r_port *info = container_of(port, struct r_port, port);
return (sGetChanStatusLo(&info->channel) & CD_ACT) ? 1 : 0;
}
/* info->port.count is considered critical, protected by spinlocks. */
static int block_til_ready(struct tty_struct *tty, struct file *filp,
struct r_port *info)
{
DECLARE_WAITQUEUE(wait, current);
struct tty_port *port = &info->port;
int retval;
int do_clocal = 0, extra_count = 0;
unsigned long flags;
@ -898,13 +905,13 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp,
/*
* Block waiting for the carrier detect and the line to become free. While we are in
* this loop, info->port.count is dropped by one, so that rp_close() knows when to free things.
* this loop, port->count is dropped by one, so that rp_close() knows when to free things.
* We restore it upon exit, either normal or abnormal.
*/
retval = 0;
add_wait_queue(&info->port.open_wait, &wait);
add_wait_queue(&port->open_wait, &wait);
#ifdef ROCKET_DEBUG_OPEN
printk(KERN_INFO "block_til_ready before block: ttyR%d, count = %d\n", info->line, info->port.count);
printk(KERN_INFO "block_til_ready before block: ttyR%d, count = %d\n", info->line, port->count);
#endif
spin_lock_irqsave(&info->slock, flags);
@ -913,10 +920,10 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp,
#else
if (!tty_hung_up_p(filp)) {
extra_count = 1;
info->port.count--;
port->count--;
}
#endif
info->port.blocked_open++;
port->blocked_open++;
spin_unlock_irqrestore(&info->slock, flags);
@ -933,7 +940,8 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp,
retval = -ERESTARTSYS;
break;
}
if (!(info->flags & ROCKET_CLOSING) && (do_clocal || (sGetChanStatusLo(&info->channel) & CD_ACT)))
if (!(info->flags & ROCKET_CLOSING) &&
(do_clocal || tty_port_carrier_raised(port)))
break;
if (signal_pending(current)) {
retval = -ERESTARTSYS;
@ -941,24 +949,24 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp,
}
#ifdef ROCKET_DEBUG_OPEN
printk(KERN_INFO "block_til_ready blocking: ttyR%d, count = %d, flags=0x%0x\n",
info->line, info->port.count, info->flags);
info->line, port->count, info->flags);
#endif
schedule(); /* Don't hold spinlock here, will hang PC */
}
__set_current_state(TASK_RUNNING);
remove_wait_queue(&info->port.open_wait, &wait);
remove_wait_queue(&port->open_wait, &wait);
spin_lock_irqsave(&info->slock, flags);
if (extra_count)
info->port.count++;
info->port.blocked_open--;
port->count++;
port->blocked_open--;
spin_unlock_irqrestore(&info->slock, flags);
#ifdef ROCKET_DEBUG_OPEN
printk(KERN_INFO "block_til_ready after blocking: ttyR%d, count = %d\n",
info->line, info->port.count);
info->line, port->count);
#endif
if (retval)
return retval;
@ -2371,6 +2379,10 @@ static const struct tty_operations rocket_ops = {
.tiocmset = rp_tiocmset,
};
static const struct tty_port_operations rocket_port_ops = {
.carrier_raised = carrier_raised,
};
/*
* The module "startup" routine; it's run when the module is loaded.
*/

19
drivers/char/ser_a2232.c
View file

@ -122,7 +122,7 @@ static void a2232_disable_tx_interrupts(void *ptr);
static void a2232_enable_tx_interrupts(void *ptr);
static void a2232_disable_rx_interrupts(void *ptr);
static void a2232_enable_rx_interrupts(void *ptr);
static int a2232_get_CD(void *ptr);
static int a2232_carrier_raised(struct tty_port *port);
static void a2232_shutdown_port(void *ptr);
static int a2232_set_real_termios(void *ptr);
static int a2232_chars_in_buffer(void *ptr);
@ -148,7 +148,6 @@ static struct real_driver a2232_real_driver = {
a2232_enable_tx_interrupts,
a2232_disable_rx_interrupts,
a2232_enable_rx_interrupts,
a2232_get_CD,
a2232_shutdown_port,
a2232_set_real_termios,
a2232_chars_in_buffer,
@ -260,9 +259,10 @@ static void a2232_enable_rx_interrupts(void *ptr)
port->disable_rx = 0;
}
static int a2232_get_CD(void *ptr)
static int a2232_carrier_raised(struct tty_port *port)
{
return ((struct a2232_port *) ptr)->cd_status;
struct a2232_port *ap = container_of(port, struct a2232_port, gs.port);
return ap->cd_status;
}
static void a2232_shutdown_port(void *ptr)
@ -638,6 +638,10 @@ int ch, err, n, p;
return IRQ_HANDLED;
}
static const struct tty_port_operations a2232_port_ops = {
.carrier_raised = a2232_carrier_raised,
};
static void a2232_init_portstructs(void)
{
struct a2232_port *port;
@ -645,6 +649,8 @@ static void a2232_init_portstructs(void)
for (i = 0; i < MAX_A2232_BOARDS*NUMLINES; i++) {
port = a2232_ports + i;
tty_port_init(&port->gs.port);
port->gs.port.ops = &a2232_port_ops;
port->which_a2232 = i/NUMLINES;
port->which_port_on_a2232 = i%NUMLINES;
port->disable_rx = port->throttle_input = port->cd_status = 0;
@ -652,11 +658,6 @@ static void a2232_init_portstructs(void)
port->gs.close_delay = HZ/2;
port->gs.closing_wait = 30 * HZ;
port->gs.rd = &a2232_real_driver;
#ifdef NEW_WRITE_LOCKING
mutex_init(&(port->gs.port_write_mutex));
#endif
init_waitqueue_head(&port->gs.port.open_wait);
init_waitqueue_head(&port->gs.port.close_wait);
}
}

28
drivers/char/stallion.c
View file

@ -130,6 +130,8 @@ static char stl_unwanted[SC26198_RXFIFOSIZE];
static DEFINE_MUTEX(stl_brdslock);
static struct stlbrd *stl_brds[STL_MAXBRDS];
static const struct tty_port_operations stl_port_ops;
/*
* Per board state flags. Used with the state field of the board struct.
* Not really much here!
@ -786,6 +788,12 @@ static int stl_open(struct tty_struct *tty, struct file *filp)
/*****************************************************************************/
static int stl_carrier_raised(struct tty_port *port)
{
struct stlport *portp = container_of(port, struct stlport, port);
return (portp->sigs & TIOCM_CD) ? 1 : 0;
}
/*
* Possibly need to wait for carrier (DCD signal) to come high. Say
* maybe because if we are clocal then we don't need to wait...
@ -796,6 +804,7 @@ static int stl_waitcarrier(struct tty_struct *tty, struct stlport *portp,
{
unsigned long flags;
int rc, doclocal;
struct tty_port *port = &portp->port;
pr_debug("stl_waitcarrier(portp=%p,filp=%p)\n", portp, filp);
@ -809,32 +818,32 @@ static int stl_waitcarrier(struct tty_struct *tty, struct stlport *portp,
portp->openwaitcnt++;
if (! tty_hung_up_p(filp))
portp->port.count--;
port->count--;
for (;;) {
/* Takes brd_lock internally */
stl_setsignals(portp, 1, 1);
if (tty_hung_up_p(filp) ||
((portp->port.flags & ASYNC_INITIALIZED) == 0)) {
if (portp->port.flags & ASYNC_HUP_NOTIFY)
((port->flags & ASYNC_INITIALIZED) == 0)) {
if (port->flags & ASYNC_HUP_NOTIFY)
rc = -EBUSY;
else
rc = -ERESTARTSYS;
break;
}
if (((portp->port.flags & ASYNC_CLOSING) == 0) &&
(doclocal || (portp->sigs & TIOCM_CD)))
if (((port->flags & ASYNC_CLOSING) == 0) &&
(doclocal || tty_port_carrier_raised(port)))
break;
if (signal_pending(current)) {
rc = -ERESTARTSYS;
break;
}
/* FIXME */
interruptible_sleep_on(&portp->port.open_wait);
interruptible_sleep_on(&port->open_wait);
}
if (! tty_hung_up_p(filp))
portp->port.count++;
port->count++;
portp->openwaitcnt--;
spin_unlock_irqrestore(&stallion_lock, flags);
@ -1776,6 +1785,7 @@ static int __devinit stl_initports(struct stlbrd *brdp, struct stlpanel *panelp)
break;
}
tty_port_init(&portp->port);
portp->port.ops = &stl_port_ops;
portp->magic = STL_PORTMAGIC;
portp->portnr = i;
portp->brdnr = panelp->brdnr;
@ -2659,6 +2669,10 @@ static const struct tty_operations stl_ops = {
.tiocmset = stl_tiocmset,
};
static const struct tty_port_operations stl_port_ops = {
.carrier_raised = stl_carrier_raised,
};
/*****************************************************************************/
/* CD1400 HARDWARE FUNCTIONS */
/*****************************************************************************/

27
drivers/char/sx.c
View file

@ -279,7 +279,7 @@ static void sx_disable_tx_interrupts(void *ptr);
static void sx_enable_tx_interrupts(void *ptr);
static void sx_disable_rx_interrupts(void *ptr);
static void sx_enable_rx_interrupts(void *ptr);
static int sx_get_CD(void *ptr);
static int sx_carrier_raised(struct tty_port *port);
static void sx_shutdown_port(void *ptr);
static int sx_set_real_termios(void *ptr);
static void sx_close(void *ptr);
@ -360,7 +360,6 @@ static struct real_driver sx_real_driver = {
sx_enable_tx_interrupts,
sx_disable_rx_interrupts,
sx_enable_rx_interrupts,
sx_get_CD,
sx_shutdown_port,
sx_set_real_termios,
sx_chars_in_buffer,
@ -791,7 +790,7 @@ static int sx_getsignals(struct sx_port *port)
sx_dprintk(SX_DEBUG_MODEMSIGNALS, "getsignals: %d/%d (%d/%d) "
"%02x/%02x\n",
(o_stat & OP_DTR) != 0, (o_stat & OP_RTS) != 0,
port->c_dcd, sx_get_CD(port),
port->c_dcd, tty_port_carrier_raised(&port->gs.port),
sx_read_channel_byte(port, hi_ip),
sx_read_channel_byte(port, hi_state));
@ -1190,7 +1189,7 @@ static inline void sx_check_modem_signals(struct sx_port *port)
hi_state = sx_read_channel_byte(port, hi_state);
sx_dprintk(SX_DEBUG_MODEMSIGNALS, "Checking modem signals (%d/%d)\n",
port->c_dcd, sx_get_CD(port));
port->c_dcd, tty_port_carrier_raised(&port->gs.port));
if (hi_state & ST_BREAK) {
hi_state &= ~ST_BREAK;
@ -1202,11 +1201,11 @@ static inline void sx_check_modem_signals(struct sx_port *port)
hi_state &= ~ST_DCD;
sx_dprintk(SX_DEBUG_MODEMSIGNALS, "got a DCD change.\n");
sx_write_channel_byte(port, hi_state, hi_state);
c_dcd = sx_get_CD(port);
c_dcd = tty_port_carrier_raised(&port->gs.port);
sx_dprintk(SX_DEBUG_MODEMSIGNALS, "DCD is now %d\n", c_dcd);
if (c_dcd != port->c_dcd) {
port->c_dcd = c_dcd;
if (sx_get_CD(port)) {
if (tty_port_carrier_raised(&port->gs.port)) {
/* DCD went UP */
if ((sx_read_channel_byte(port, hi_hstat) !=
HS_IDLE_CLOSED) &&
@ -1415,13 +1414,10 @@ static void sx_enable_rx_interrupts(void *ptr)
}
/* Jeez. Isn't this simple? */
static int sx_get_CD(void *ptr)
static int sx_carrier_raised(struct tty_port *port)
{
struct sx_port *port = ptr;
func_enter2();
func_exit();
return ((sx_read_channel_byte(port, hi_ip) & IP_DCD) != 0);
struct sx_port *sp = container_of(port, struct sx_port, gs.port);
return ((sx_read_channel_byte(sp, hi_ip) & IP_DCD) != 0);
}
/* Jeez. Isn't this simple? */
@ -1536,7 +1532,7 @@ static int sx_open(struct tty_struct *tty, struct file *filp)
}
/* tty->low_latency = 1; */
port->c_dcd = sx_get_CD(port);
port->c_dcd = sx_carrier_raised(&port->gs.port);
sx_dprintk(SX_DEBUG_OPEN, "at open: cd=%d\n", port->c_dcd);
func_exit();
@ -2354,6 +2350,10 @@ static const struct tty_operations sx_ops = {
.tiocmset = sx_tiocmset,
};
static const struct tty_port_operations sx_port_ops = {
.carrier_raised = sx_carrier_raised,
};
static int sx_init_drivers(void)
{
int error;
@ -2410,6 +2410,7 @@ static int sx_init_portstructs(int nboards, int nports)
for (j = 0; j < boards[i].nports; j++) {
sx_dprintk(SX_DEBUG_INIT, "initing port %d\n", j);
tty_port_init(&port->gs.port);
port->gs.port.ops = &sx_port_ops;
port->gs.magic = SX_MAGIC;
port->gs.close_delay = HZ / 2;
port->gs.closing_wait = 30 * HZ;

61
drivers/char/synclink.c
View file

@ -3281,6 +3281,23 @@ static void mgsl_hangup(struct tty_struct *tty)
} /* end of mgsl_hangup() */
/*
* carrier_raised()
*
* Return true if carrier is raised
*/
static int carrier_raised(struct tty_port *port)
{
unsigned long flags;
struct mgsl_struct *info = container_of(port, struct mgsl_struct, port);
spin_lock_irqsave(&info->irq_spinlock, flags);
usc_get_serial_signals(info);
spin_unlock_irqrestore(&info->irq_spinlock, flags);
return (info->serial_signals & SerialSignal_DCD) ? 1 : 0;
}
/* block_til_ready()
*
* Block the current process until the specified port
@ -3302,6 +3319,8 @@ static int block_til_ready(struct tty_struct *tty, struct file * filp,
bool do_clocal = false;
bool extra_count = false;
unsigned long flags;
int dcd;
struct tty_port *port = &info->port;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):block_til_ready on %s\n",
@ -3309,7 +3328,7 @@ static int block_til_ready(struct tty_struct *tty, struct file * filp,
if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
/* nonblock mode is set or port is not enabled */
info->port.flags |= ASYNC_NORMAL_ACTIVE;
port->flags |= ASYNC_NORMAL_ACTIVE;
return 0;
}
@ -3318,25 +3337,25 @@ static int block_til_ready(struct tty_struct *tty, struct file * filp,
/* Wait for carrier detect and the line to become
* free (i.e., not in use by the callout). While we are in
* this loop, info->port.count is dropped by one, so that
* this loop, port->count is dropped by one, so that
* mgsl_close() knows when to free things. We restore it upon
* exit, either normal or abnormal.
*/
retval = 0;
add_wait_queue(&info->port.open_wait, &wait);
add_wait_queue(&port->open_wait, &wait);
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):block_til_ready before block on %s count=%d\n",
__FILE__,__LINE__, tty->driver->name, info->port.count );
__FILE__,__LINE__, tty->driver->name, port->count );
spin_lock_irqsave(&info->irq_spinlock, flags);
if (!tty_hung_up_p(filp)) {
extra_count = true;
info->port.count--;
port->count--;
}
spin_unlock_irqrestore(&info->irq_spinlock, flags);
info->port.blocked_open++;
port->blocked_open++;
while (1) {
if (tty->termios->c_cflag & CBAUD) {
@ -3348,20 +3367,16 @@ static int block_til_ready(struct tty_struct *tty, struct file * filp,
set_current_state(TASK_INTERRUPTIBLE);
if (tty_hung_up_p(filp) || !(info->port.flags & ASYNC_INITIALIZED)){
retval = (info->port.flags & ASYNC_HUP_NOTIFY) ?
if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)){
retval = (port->flags & ASYNC_HUP_NOTIFY) ?
-EAGAIN : -ERESTARTSYS;
break;
}
spin_lock_irqsave(&info->irq_spinlock,flags);
usc_get_serial_signals(info);
spin_unlock_irqrestore(&info->irq_spinlock,flags);
dcd = tty_port_carrier_raised(&info->port);
if (!(info->port.flags & ASYNC_CLOSING) &&
(do_clocal || (info->serial_signals & SerialSignal_DCD)) ) {
if (!(port->flags & ASYNC_CLOSING) && (do_clocal || dcd))
break;
}
if (signal_pending(current)) {
retval = -ERESTARTSYS;
@ -3370,24 +3385,24 @@ static int block_til_ready(struct tty_struct *tty, struct file * filp,
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):block_til_ready blocking on %s count=%d\n",
__FILE__,__LINE__, tty->driver->name, info->port.count );
__FILE__,__LINE__, tty->driver->name, port->count );
schedule();
}
set_current_state(TASK_RUNNING);
remove_wait_queue(&info->port.open_wait, &wait);
remove_wait_queue(&port->open_wait, &wait);
if (extra_count)
info->port.count++;
info->port.blocked_open--;
port->count++;
port->blocked_open--;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):block_til_ready after blocking on %s count=%d\n",
__FILE__,__LINE__, tty->driver->name, info->port.count );
__FILE__,__LINE__, tty->driver->name, port->count );
if (!retval)
info->port.flags |= ASYNC_NORMAL_ACTIVE;
port->flags |= ASYNC_NORMAL_ACTIVE;
return retval;
@ -4304,6 +4319,11 @@ static void mgsl_add_device( struct mgsl_struct *info )
} /* end of mgsl_add_device() */
static const struct tty_port_operations mgsl_port_ops = {
.carrier_raised = carrier_raised,
};
/* mgsl_allocate_device()
*
* Allocate and initialize a device instance structure
@ -4322,6 +4342,7 @@ static struct mgsl_struct* mgsl_allocate_device(void)
printk("Error can't allocate device instance data\n");
} else {
tty_port_init(&info->port);
info->port.ops = &mgsl_port_ops;
info->magic = MGSL_MAGIC;
INIT_WORK(&info->task, mgsl_bh_handler);
info->max_frame_size = 4096;

48
drivers/char/synclink_gt.c
View file

@ -3132,6 +3132,17 @@ static int tiocmset(struct tty_struct *tty, struct file *file,
return 0;
}
static int carrier_raised(struct tty_port *port)
{
unsigned long flags;
struct slgt_info *info = container_of(port, struct slgt_info, port);
spin_lock_irqsave(&info->lock,flags);
get_signals(info);
spin_unlock_irqrestore(&info->lock,flags);
return (info->signals & SerialSignal_DCD) ? 1 : 0;
}
/*
* block current process until the device is ready to open
*/
@ -3143,12 +3154,14 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp,
bool do_clocal = false;
bool extra_count = false;
unsigned long flags;
int cd;
struct tty_port *port = &info->port;
DBGINFO(("%s block_til_ready\n", tty->driver->name));
if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
/* nonblock mode is set or port is not enabled */
info->port.flags |= ASYNC_NORMAL_ACTIVE;
port->flags |= ASYNC_NORMAL_ACTIVE;
return 0;
}
@ -3157,21 +3170,21 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp,
/* Wait for carrier detect and the line to become
* free (i.e., not in use by the callout). While we are in
* this loop, info->port.count is dropped by one, so that
* this loop, port->count is dropped by one, so that
* close() knows when to free things. We restore it upon
* exit, either normal or abnormal.
*/
retval = 0;
add_wait_queue(&info->port.open_wait, &wait);
add_wait_queue(&port->open_wait, &wait);
spin_lock_irqsave(&info->lock, flags);
if (!tty_hung_up_p(filp)) {
extra_count = true;
info->port.count--;
port->count--;
}
spin_unlock_irqrestore(&info->lock, flags);
info->port.blocked_open++;
port->blocked_open++;
while (1) {
if ((tty->termios->c_cflag & CBAUD)) {
@ -3183,20 +3196,16 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp,
set_current_state(TASK_INTERRUPTIBLE);
if (tty_hung_up_p(filp) || !(info->port.flags & ASYNC_INITIALIZED)){
retval = (info->port.flags & ASYNC_HUP_NOTIFY) ?
if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)){
retval = (port->flags & ASYNC_HUP_NOTIFY) ?
-EAGAIN : -ERESTARTSYS;
break;
}
spin_lock_irqsave(&info->lock,flags);
get_signals(info);
spin_unlock_irqrestore(&info->lock,flags);
cd = tty_port_carrier_raised(port);
if (!(info->port.flags & ASYNC_CLOSING) &&
(do_clocal || (info->signals & SerialSignal_DCD)) ) {
if (!(port->flags & ASYNC_CLOSING) && (do_clocal || cd ))
break;
}
if (signal_pending(current)) {
retval = -ERESTARTSYS;
@ -3208,14 +3217,14 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp,
}
set_current_state(TASK_RUNNING);
remove_wait_queue(&info->port.open_wait, &wait);
remove_wait_queue(&port->open_wait, &wait);
if (extra_count)
info->port.count++;
info->port.blocked_open--;
port->count++;
port->blocked_open--;
if (!retval)
info->port.flags |= ASYNC_NORMAL_ACTIVE;
port->flags |= ASYNC_NORMAL_ACTIVE;
DBGINFO(("%s block_til_ready ready, rc=%d\n", tty->driver->name, retval));
return retval;
@ -3444,6 +3453,10 @@ static void add_device(struct slgt_info *info)
#endif
}
static const struct tty_port_operations slgt_port_ops = {
.carrier_raised = carrier_raised,
};
/*
* allocate device instance structure, return NULL on failure
*/
@ -3458,6 +3471,7 @@ static struct slgt_info *alloc_dev(int adapter_num, int port_num, struct pci_dev
driver_name, adapter_num, port_num));
} else {
tty_port_init(&info->port);
info->port.ops = &slgt_port_ops;
info->magic = MGSL_MAGIC;
INIT_WORK(&info->task, bh_handler);
info->max_frame_size = 4096;

55
drivers/char/synclinkmp.c
View file

@ -558,6 +558,7 @@ static void release_resources(SLMP_INFO *info);
static int startup(SLMP_INFO *info);
static int block_til_ready(struct tty_struct *tty, struct file * filp,SLMP_INFO *info);
static int carrier_raised(struct tty_port *port);
static void shutdown(SLMP_INFO *info);
static void program_hw(SLMP_INFO *info);
static void change_params(SLMP_INFO *info);
@ -3318,7 +3319,17 @@ static int tiocmset(struct tty_struct *tty, struct file *file,
return 0;
}
static int carrier_raised(struct tty_port *port)
{
SLMP_INFO *info = container_of(port, SLMP_INFO, port);
unsigned long flags;
spin_lock_irqsave(&info->lock,flags);
get_signals(info);
spin_unlock_irqrestore(&info->lock,flags);
return (info->serial_signals & SerialSignal_DCD) ? 1 : 0;
}
/* Block the current process until the specified port is ready to open.
*/
@ -3330,6 +3341,8 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp,
bool do_clocal = false;
bool extra_count = false;
unsigned long flags;
int cd;
struct tty_port *port = &info->port;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):%s block_til_ready()\n",
@ -3338,7 +3351,7 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp,
if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
/* nonblock mode is set or port is not enabled */
/* just verify that callout device is not active */
info->port.flags |= ASYNC_NORMAL_ACTIVE;
port->flags |= ASYNC_NORMAL_ACTIVE;
return 0;
}
@ -3347,25 +3360,25 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp,
/* Wait for carrier detect and the line to become
* free (i.e., not in use by the callout). While we are in
* this loop, info->port.count is dropped by one, so that
* this loop, port->count is dropped by one, so that
* close() knows when to free things. We restore it upon
* exit, either normal or abnormal.
*/
retval = 0;
add_wait_queue(&info->port.open_wait, &wait);
add_wait_queue(&port->open_wait, &wait);
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):%s block_til_ready() before block, count=%d\n",
__FILE__,__LINE__, tty->driver->name, info->port.count );
__FILE__,__LINE__, tty->driver->name, port->count );
spin_lock_irqsave(&info->lock, flags);
if (!tty_hung_up_p(filp)) {
extra_count = true;
info->port.count--;
port->count--;
}
spin_unlock_irqrestore(&info->lock, flags);
info->port.blocked_open++;
port->blocked_open++;
while (1) {
if ((tty->termios->c_cflag & CBAUD)) {
@ -3377,20 +3390,16 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp,
set_current_state(TASK_INTERRUPTIBLE);
if (tty_hung_up_p(filp) || !(info->port.flags & ASYNC_INITIALIZED)){
retval = (info->port.flags & ASYNC_HUP_NOTIFY) ?
if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)){
retval = (port->flags & ASYNC_HUP_NOTIFY) ?
-EAGAIN : -ERESTARTSYS;
break;
}
spin_lock_irqsave(&info->lock,flags);
get_signals(info);
spin_unlock_irqrestore(&info->lock,flags);
cd = tty_port_carrier_raised(port);
if (!(info->port.flags & ASYNC_CLOSING) &&
(do_clocal || (info->serial_signals & SerialSignal_DCD)) ) {
if (!(port->flags & ASYNC_CLOSING) && (do_clocal || cd))
break;
}
if (signal_pending(current)) {
retval = -ERESTARTSYS;
@ -3399,24 +3408,24 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp,
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):%s block_til_ready() count=%d\n",
__FILE__,__LINE__, tty->driver->name, info->port.count );
__FILE__,__LINE__, tty->driver->name, port->count );
schedule();
}
set_current_state(TASK_RUNNING);
remove_wait_queue(&info->port.open_wait, &wait);
remove_wait_queue(&port->open_wait, &wait);
if (extra_count)
info->port.count++;
info->port.blocked_open--;
port->count++;
port->blocked_open--;
if (debug_level >= DEBUG_LEVEL_INFO)
printk("%s(%d):%s block_til_ready() after, count=%d\n",
__FILE__,__LINE__, tty->driver->name, info->port.count );
__FILE__,__LINE__, tty->driver->name, port->count );
if (!retval)
info->port.flags |= ASYNC_NORMAL_ACTIVE;
port->flags |= ASYNC_NORMAL_ACTIVE;
return retval;
}
@ -3782,6 +3791,10 @@ static void add_device(SLMP_INFO *info)
#endif
}
static const struct tty_port_operations port_ops = {
.carrier_raised = carrier_raised,
};
/* Allocate and initialize a device instance structure
*
* Return Value: pointer to SLMP_INFO if success, otherwise NULL
@ -3798,6 +3811,7 @@ static SLMP_INFO *alloc_dev(int adapter_num, int port_num, struct pci_dev *pdev)
__FILE__,__LINE__, adapter_num, port_num);
} else {
tty_port_init(&info->port);
info->port.ops = &port_ops;
info->magic = MGSL_MAGIC;
INIT_WORK(&info->task, bh_handler);
info->max_frame_size = 4096;
@ -3940,6 +3954,7 @@ static const struct tty_operations ops = {
.tiocmset = tiocmset,
};
static void synclinkmp_cleanup(void)
{
int rc;

17
drivers/char/tty_port.c
View file

@ -94,3 +94,20 @@ void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty)
spin_unlock_irqrestore(&port->lock, flags);
}
EXPORT_SYMBOL(tty_port_tty_set);
/**
* tty_port_carrier_raised - carrier raised check
* @port: tty port
*
* Wrapper for the carrier detect logic. For the moment this is used
* to hide some internal details. This will eventually become entirely
* internal to the tty port.
*/
int tty_port_carrier_raised(struct tty_port *port)
{
if (port->ops->carrier_raised == NULL)
return 1;
return port->ops->carrier_raised(port);
}
EXPORT_SYMBOL(tty_port_carrier_raised);

15
drivers/char/vme_scc.c
View file

@ -69,7 +69,7 @@ static void scc_disable_tx_interrupts(void * ptr);
static void scc_enable_tx_interrupts(void * ptr);
static void scc_disable_rx_interrupts(void * ptr);
static void scc_enable_rx_interrupts(void * ptr);
static int scc_get_CD(void * ptr);
static int scc_carrier_raised(struct tty_port *port);
static void scc_shutdown_port(void * ptr);
static int scc_set_real_termios(void *ptr);
static void scc_hungup(void *ptr);
@ -100,7 +100,6 @@ static struct real_driver scc_real_driver = {
scc_enable_tx_interrupts,
scc_disable_rx_interrupts,
scc_enable_rx_interrupts,
scc_get_CD,
scc_shutdown_port,
scc_set_real_termios,
scc_chars_in_buffer,
@ -129,6 +128,10 @@ static const struct tty_operations scc_ops = {
.break_ctl = scc_break_ctl,
};
static const struct tty_port_operations scc_port_ops = {
.carrier_raised = scc_carrier_raised,
};
/*----------------------------------------------------------------------------
* vme_scc_init() and support functions
*---------------------------------------------------------------------------*/
@ -176,6 +179,8 @@ static void scc_init_portstructs(void)
for (i = 0; i < 2; i++) {
port = scc_ports + i;
tty_port_init(&port->gs.port);
port->gs.port.ops = &scc_port_ops;
port->gs.magic = SCC_MAGIC;
port->gs.close_delay = HZ/2;
port->gs.closing_wait = 30 * HZ;
@ -624,9 +629,9 @@ static void scc_enable_rx_interrupts(void *ptr)
}
static int scc_get_CD(void *ptr)
static int scc_carrier_raised(struct tty_port *port)
{
struct scc_port *port = ptr;
struct scc_port *scc = container_of(port, struct scc_port, gs.port);
unsigned channel = port->channel;
return !!(scc_last_status_reg[channel] & SR_DCD);
@ -896,7 +901,7 @@ static int scc_open (struct tty_struct * tty, struct file * filp)
return retval;
}
port->c_dcd = scc_get_CD (port);
port->c_dcd = tty_port_carrier_raised(&port->gs.port);
scc_enable_rx_interrupts(port);

1
include/linux/generic_serial.h
View file

@ -21,7 +21,6 @@ struct real_driver {
void (*enable_tx_interrupts) (void *);
void (*disable_rx_interrupts) (void *);
void (*enable_rx_interrupts) (void *);
int (*get_CD) (void *);
void (*shutdown_port) (void*);
int (*set_real_termios) (void*);
int (*chars_in_buffer) (void*);

9
include/linux/tty.h
View file

@ -180,8 +180,16 @@ struct signal_struct;
* until a hangup so don't use the wrong path.
*/
struct tty_port;
struct tty_port_operations {
/* Return 1 if the carrier is raised */
int (*carrier_raised)(struct tty_port *port);
};
struct tty_port {
struct tty_struct *tty; /* Back pointer */
const struct tty_port_operations *ops; /* Port operations */
spinlock_t lock; /* Lock protecting tty field */
int blocked_open; /* Waiting to open */
int count; /* Usage count */
@ -427,6 +435,7 @@ extern int tty_port_alloc_xmit_buf(struct tty_port *port);
extern void tty_port_free_xmit_buf(struct tty_port *port);
extern struct tty_struct *tty_port_tty_get(struct tty_port *port);
extern void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty);
extern int tty_port_carrier_raised(struct tty_port *port);
extern int tty_register_ldisc(int disc, struct tty_ldisc_ops *new_ldisc);
extern int tty_unregister_ldisc(int disc);