Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-11 06:31:49 +00:00
Code Issues Packages Projects Releases Wiki Activity

tty_port: Add a port level carrier detect operation

Browse Source 
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

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);