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path: root/drivers/char/epca.c
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Diffstat (limited to 'drivers/char/epca.c')
-rw-r--r--drivers/char/epca.c265
1 files changed, 76 insertions, 189 deletions
diff --git a/drivers/char/epca.c b/drivers/char/epca.c
index cf2461d34e5..39ad820b235 100644
--- a/drivers/char/epca.c
+++ b/drivers/char/epca.c
@@ -69,7 +69,9 @@ static int invalid_lilo_config;
/*
* The ISA boards do window flipping into the same spaces so its only sane with
- * a single lock. It's still pretty efficient.
+ * a single lock. It's still pretty efficient. This lock guards the hardware
+ * and the tty_port lock guards the kernel side stuff like use counts. Take
+ * this lock inside the port lock if you must take both.
*/
static DEFINE_SPINLOCK(epca_lock);
@@ -156,14 +158,12 @@ static struct channel *verifyChannel(struct tty_struct *);
static void pc_sched_event(struct channel *, int);
static void epca_error(int, char *);
static void pc_close(struct tty_struct *, struct file *);
-static void shutdown(struct channel *);
+static void shutdown(struct channel *, struct tty_struct *tty);
static void pc_hangup(struct tty_struct *);
static int pc_write_room(struct tty_struct *);
static int pc_chars_in_buffer(struct tty_struct *);
static void pc_flush_buffer(struct tty_struct *);
static void pc_flush_chars(struct tty_struct *);
-static int block_til_ready(struct tty_struct *, struct file *,
- struct channel *);
static int pc_open(struct tty_struct *, struct file *);
static void post_fep_init(unsigned int crd);
static void epcapoll(unsigned long);
@@ -173,7 +173,7 @@ static unsigned termios2digi_h(struct channel *ch, unsigned);
static unsigned termios2digi_i(struct channel *ch, unsigned);
static unsigned termios2digi_c(struct channel *ch, unsigned);
static void epcaparam(struct tty_struct *, struct channel *);
-static void receive_data(struct channel *);
+static void receive_data(struct channel *, struct tty_struct *tty);
static int pc_ioctl(struct tty_struct *, struct file *,
unsigned int, unsigned long);
static int info_ioctl(struct tty_struct *, struct file *,
@@ -392,7 +392,7 @@ static struct channel *verifyChannel(struct tty_struct *tty)
* through tty->driver_data this should catch it.
*/
if (tty) {
- struct channel *ch = (struct channel *)tty->driver_data;
+ struct channel *ch = tty->driver_data;
if (ch >= &digi_channels[0] && ch < &digi_channels[nbdevs]) {
if (ch->magic == EPCA_MAGIC)
return ch;
@@ -419,76 +419,34 @@ static void epca_error(int line, char *msg)
static void pc_close(struct tty_struct *tty, struct file *filp)
{
struct channel *ch;
- unsigned long flags;
+ struct tty_port *port;
/*
* verifyChannel returns the channel from the tty struct if it is
* valid. This serves as a sanity check.
*/
ch = verifyChannel(tty);
- if (ch != NULL) {
- spin_lock_irqsave(&epca_lock, flags);
- if (tty_hung_up_p(filp)) {
- spin_unlock_irqrestore(&epca_lock, flags);
- return;
- }
- if (ch->port.count-- > 1) {
- /* Begin channel is open more than once */
- /*
- * Return without doing anything. Someone might still
- * be using the channel.
- */
- spin_unlock_irqrestore(&epca_lock, flags);
- return;
- }
- /* Port open only once go ahead with shutdown & reset */
- BUG_ON(ch->port.count < 0);
-
- /*
- * Let the rest of the driver know the channel is being closed.
- * This becomes important if an open is attempted before close
- * is finished.
- */
- ch->port.flags |= ASYNC_CLOSING;
- tty->closing = 1;
-
- spin_unlock_irqrestore(&epca_lock, flags);
-
- if (ch->port.flags & ASYNC_INITIALIZED) {
- /* Setup an event to indicate when the
- transmit buffer empties */
- setup_empty_event(tty, ch);
- /* 30 seconds timeout */
- tty_wait_until_sent(tty, 3000);
- }
- pc_flush_buffer(tty);
+ if (ch == NULL)
+ return;
+ port = &ch->port;
- tty_ldisc_flush(tty);
- shutdown(ch);
+ if (tty_port_close_start(port, tty, filp) == 0)
+ return;
- spin_lock_irqsave(&epca_lock, flags);
- tty->closing = 0;
- ch->event = 0;
- ch->port.tty = NULL;
- spin_unlock_irqrestore(&epca_lock, flags);
+ pc_flush_buffer(tty);
+ shutdown(ch, tty);
- if (ch->port.blocked_open) {
- if (ch->close_delay)
- msleep_interruptible(jiffies_to_msecs(ch->close_delay));
- wake_up_interruptible(&ch->port.open_wait);
- }
- ch->port.flags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_INITIALIZED |
- ASYNC_CLOSING);
- wake_up_interruptible(&ch->port.close_wait);
- }
+ tty_port_close_end(port, tty);
+ ch->event = 0; /* FIXME: review ch->event locking */
+ tty_port_tty_set(port, NULL);
}
-static void shutdown(struct channel *ch)
+static void shutdown(struct channel *ch, struct tty_struct *tty)
{
unsigned long flags;
- struct tty_struct *tty;
struct board_chan __iomem *bc;
+ struct tty_port *port = &ch->port;
- if (!(ch->port.flags & ASYNC_INITIALIZED))
+ if (!(port->flags & ASYNC_INITIALIZED))
return;
spin_lock_irqsave(&epca_lock, flags);
@@ -503,7 +461,6 @@ static void shutdown(struct channel *ch)
*/
if (bc)
writeb(0, &bc->idata);
- tty = ch->port.tty;
/* If we're a modem control device and HUPCL is on, drop RTS & DTR. */
if (tty->termios->c_cflag & HUPCL) {
@@ -517,32 +474,26 @@ static void shutdown(struct channel *ch)
* will have to reinitialized. Set a flag to indicate this.
*/
/* Prevent future Digi programmed interrupts from coming active */
- ch->port.flags &= ~ASYNC_INITIALIZED;
+ port->flags &= ~ASYNC_INITIALIZED;
spin_unlock_irqrestore(&epca_lock, flags);
}
static void pc_hangup(struct tty_struct *tty)
{
struct channel *ch;
+
/*
* verifyChannel returns the channel from the tty struct if it is
* valid. This serves as a sanity check.
*/
ch = verifyChannel(tty);
if (ch != NULL) {
- unsigned long flags;
-
pc_flush_buffer(tty);
tty_ldisc_flush(tty);
- shutdown(ch);
+ shutdown(ch, tty);
- spin_lock_irqsave(&epca_lock, flags);
- ch->port.tty = NULL;
- ch->event = 0;
- ch->port.count = 0;
- ch->port.flags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_INITIALIZED);
- spin_unlock_irqrestore(&epca_lock, flags);
- wake_up_interruptible(&ch->port.open_wait);
+ ch->event = 0; /* FIXME: review locking of ch->event */
+ tty_port_hangup(&ch->port);
}
}
@@ -786,100 +737,22 @@ static void pc_flush_chars(struct tty_struct *tty)
}
}
-static int block_til_ready(struct tty_struct *tty,
- struct file *filp, struct channel *ch)
+static int epca_carrier_raised(struct tty_port *port)
{
- DECLARE_WAITQUEUE(wait, current);
- int retval, do_clocal = 0;
- unsigned long flags;
-
- if (tty_hung_up_p(filp)) {
- if (ch->port.flags & ASYNC_HUP_NOTIFY)
- retval = -EAGAIN;
- else
- retval = -ERESTARTSYS;
- return retval;
- }
-
- /*
- * If the device is in the middle of being closed, then block until
- * it's done, and then try again.
- */
- if (ch->port.flags & ASYNC_CLOSING) {
- interruptible_sleep_on(&ch->port.close_wait);
-
- if (ch->port.flags & ASYNC_HUP_NOTIFY)
- return -EAGAIN;
- else
- return -ERESTARTSYS;
- }
-
- if (filp->f_flags & O_NONBLOCK) {
- /*
- * If non-blocking mode is set, then make the check up front
- * and then exit.
- */
- ch->port.flags |= ASYNC_NORMAL_ACTIVE;
- return 0;
- }
- if (tty->termios->c_cflag & CLOCAL)
- do_clocal = 1;
- /* Block waiting for the carrier detect and the line to become free */
-
- retval = 0;
- add_wait_queue(&ch->port.open_wait, &wait);
-
- spin_lock_irqsave(&epca_lock, flags);
- /* We dec count so that pc_close will know when to free things */
- if (!tty_hung_up_p(filp))
- ch->port.count--;
- ch->port.blocked_open++;
- while (1) {
- set_current_state(TASK_INTERRUPTIBLE);
- if (tty_hung_up_p(filp) ||
- !(ch->port.flags & ASYNC_INITIALIZED)) {
- if (ch->port.flags & ASYNC_HUP_NOTIFY)
- retval = -EAGAIN;
- else
- retval = -ERESTARTSYS;
- break;
- }
- if (!(ch->port.flags & ASYNC_CLOSING) &&
- (do_clocal || (ch->imodem & ch->dcd)))
- break;
- if (signal_pending(current)) {
- retval = -ERESTARTSYS;
- break;
- }
- spin_unlock_irqrestore(&epca_lock, flags);
- /*
- * Allow someone else to be scheduled. We will occasionally go
- * through this loop until one of the above conditions change.
- * The below schedule call will allow other processes to enter
- * and prevent this loop from hogging the cpu.
- */
- schedule();
- spin_lock_irqsave(&epca_lock, flags);
- }
-
- __set_current_state(TASK_RUNNING);
- remove_wait_queue(&ch->port.open_wait, &wait);
- if (!tty_hung_up_p(filp))
- ch->port.count++;
- ch->port.blocked_open--;
-
- spin_unlock_irqrestore(&epca_lock, flags);
-
- if (retval)
- return retval;
-
- ch->port.flags |= ASYNC_NORMAL_ACTIVE;
+ struct channel *ch = container_of(port, struct channel, port);
+ if (ch->imodem & ch->dcd)
+ return 1;
return 0;
}
+static void epca_raise_dtr_rts(struct tty_port *port)
+{
+}
+
static int pc_open(struct tty_struct *tty, struct file *filp)
{
struct channel *ch;
+ struct tty_port *port;
unsigned long flags;
int line, retval, boardnum;
struct board_chan __iomem *bc;
@@ -890,6 +763,7 @@ static int pc_open(struct tty_struct *tty, struct file *filp)
return -ENODEV;
ch = &digi_channels[line];
+ port = &ch->port;
boardnum = ch->boardnum;
/* Check status of board configured in system. */
@@ -926,22 +800,24 @@ static int pc_open(struct tty_struct *tty, struct file *filp)
return -ENODEV;
}
- spin_lock_irqsave(&epca_lock, flags);
+ spin_lock_irqsave(&port->lock, flags);
/*
* Every time a channel is opened, increment a counter. This is
* necessary because we do not wish to flush and shutdown the channel
* until the last app holding the channel open, closes it.
*/
- ch->port.count++;
+ port->count++;
/*
* Set a kernel structures pointer to our local channel structure. This
* way we can get to it when passed only a tty struct.
*/
tty->driver_data = ch;
+ port->tty = tty;
/*
* If this is the first time the channel has been opened, initialize
* the tty->termios struct otherwise let pc_close handle it.
*/
+ spin_lock(&epca_lock);
globalwinon(ch);
ch->statusflags = 0;
@@ -956,31 +832,33 @@ static int pc_open(struct tty_struct *tty, struct file *filp)
writew(head, &bc->rout);
/* Set the channels associated tty structure */
- ch->port.tty = tty;
/*
* The below routine generally sets up parity, baud, flow control
* issues, etc.... It effect both control flags and input flags.
*/
epcaparam(tty, ch);
- ch->port.flags |= ASYNC_INITIALIZED;
memoff(ch);
- spin_unlock_irqrestore(&epca_lock, flags);
+ spin_unlock(&epca_lock);
+ port->flags |= ASYNC_INITIALIZED;
+ spin_unlock_irqrestore(&port->lock, flags);
- retval = block_til_ready(tty, filp, ch);
+ retval = tty_port_block_til_ready(port, tty, filp);
if (retval)
return retval;
/*
* Set this again in case a hangup set it to zero while this open() was
* waiting for the line...
*/
- spin_lock_irqsave(&epca_lock, flags);
- ch->port.tty = tty;
+ spin_lock_irqsave(&port->lock, flags);
+ port->tty = tty;
+ spin_lock(&epca_lock);
globalwinon(ch);
/* Enable Digi Data events */
writeb(1, &bc->idata);
memoff(ch);
- spin_unlock_irqrestore(&epca_lock, flags);
+ spin_unlock(&epca_lock);
+ spin_unlock_irqrestore(&port->lock, flags);
return 0;
}
@@ -1016,8 +894,11 @@ static void __exit epca_module_exit(void)
}
ch = card_ptr[crd];
for (count = 0; count < bd->numports; count++, ch++) {
- if (ch && ch->port.tty)
- tty_hangup(ch->port.tty);
+ struct tty_struct *tty = tty_port_tty_get(&ch->port);
+ if (tty) {
+ tty_hangup(tty);
+ tty_kref_put(tty);
+ }
}
}
pci_unregister_driver(&epca_driver);
@@ -1042,6 +923,11 @@ static const struct tty_operations pc_ops = {
.break_ctl = pc_send_break
};
+static const struct tty_port_operations epca_port_ops = {
+ .carrier_raised = epca_carrier_raised,
+ .raise_dtr_rts = epca_raise_dtr_rts,
+};
+
static int info_open(struct tty_struct *tty, struct file *filp)
{
return 0;
@@ -1377,6 +1263,7 @@ static void post_fep_init(unsigned int crd)
u16 tseg, rseg;
tty_port_init(&ch->port);
+ ch->port.ops = &epca_port_ops;
ch->brdchan = bc;
ch->mailbox = gd;
INIT_WORK(&ch->tqueue, do_softint);
@@ -1428,7 +1315,7 @@ static void post_fep_init(unsigned int crd)
ch->boardnum = crd;
ch->channelnum = i;
ch->magic = EPCA_MAGIC;
- ch->port.tty = NULL;
+ tty_port_tty_set(&ch->port, NULL);
if (shrinkmem) {
fepcmd(ch, SETBUFFER, 32, 0, 0, 0);
@@ -1510,7 +1397,7 @@ static void post_fep_init(unsigned int crd)
ch->fepstartca = 0;
ch->fepstopca = 0;
- ch->close_delay = 50;
+ ch->port.close_delay = 50;
spin_unlock_irqrestore(&epca_lock, flags);
}
@@ -1622,15 +1509,16 @@ static void doevent(int crd)
if (bc == NULL)
goto next;
+ tty = tty_port_tty_get(&ch->port);
if (event & DATA_IND) { /* Begin DATA_IND */
- receive_data(ch);
+ receive_data(ch, tty);
assertgwinon(ch);
} /* End DATA_IND */
/* else *//* Fix for DCD transition missed bug */
if (event & MODEMCHG_IND) {
/* A modem signal change has been indicated */
ch->imodem = mstat;
- if (ch->port.flags & ASYNC_CHECK_CD) {
+ if (test_bit(ASYNC_CHECK_CD, &ch->port.flags)) {
/* We are now receiving dcd */
if (mstat & ch->dcd)
wake_up_interruptible(&ch->port.open_wait);
@@ -1638,7 +1526,6 @@ static void doevent(int crd)
pc_sched_event(ch, EPCA_EVENT_HANGUP);
}
}
- tty = ch->port.tty;
if (tty) {
if (event & BREAK_IND) {
/* A break has been indicated */
@@ -1658,6 +1545,7 @@ static void doevent(int crd)
tty_wakeup(tty);
}
}
+ tty_kref_put(tty);
}
next:
globalwinon(ch);
@@ -1877,9 +1765,9 @@ static void epcaparam(struct tty_struct *tty, struct channel *ch)
* that the driver will wait on carrier detect.
*/
if (ts->c_cflag & CLOCAL)
- ch->port.flags &= ~ASYNC_CHECK_CD;
+ clear_bit(ASYNC_CHECK_CD, &ch->port.flags);
else
- ch->port.flags |= ASYNC_CHECK_CD;
+ set_bit(ASYNC_CHECK_CD, &ch->port.flags);
mval = ch->m_dtr | ch->m_rts;
} /* End CBAUD not detected */
iflag = termios2digi_i(ch, ts->c_iflag);
@@ -1952,11 +1840,10 @@ static void epcaparam(struct tty_struct *tty, struct channel *ch)
}
/* Caller holds lock */
-static void receive_data(struct channel *ch)
+static void receive_data(struct channel *ch, struct tty_struct *tty)
{
unchar *rptr;
struct ktermios *ts = NULL;
- struct tty_struct *tty;
struct board_chan __iomem *bc;
int dataToRead, wrapgap, bytesAvailable;
unsigned int tail, head;
@@ -1969,7 +1856,6 @@ static void receive_data(struct channel *ch)
globalwinon(ch);
if (ch->statusflags & RXSTOPPED)
return;
- tty = ch->port.tty;
if (tty)
ts = tty->termios;
bc = ch->brdchan;
@@ -2029,7 +1915,7 @@ static void receive_data(struct channel *ch)
globalwinon(ch);
writew(tail, &bc->rout);
/* Must be called with global data */
- tty_schedule_flip(ch->port.tty);
+ tty_schedule_flip(tty);
}
static int info_ioctl(struct tty_struct *tty, struct file *file,
@@ -2097,7 +1983,7 @@ static int info_ioctl(struct tty_struct *tty, struct file *file,
static int pc_tiocmget(struct tty_struct *tty, struct file *file)
{
- struct channel *ch = (struct channel *) tty->driver_data;
+ struct channel *ch = tty->driver_data;
struct board_chan __iomem *bc;
unsigned int mstat, mflag = 0;
unsigned long flags;
@@ -2131,7 +2017,7 @@ static int pc_tiocmget(struct tty_struct *tty, struct file *file)
static int pc_tiocmset(struct tty_struct *tty, struct file *file,
unsigned int set, unsigned int clear)
{
- struct channel *ch = (struct channel *) tty->driver_data;
+ struct channel *ch = tty->driver_data;
unsigned long flags;
if (!ch)
@@ -2178,7 +2064,7 @@ static int pc_ioctl(struct tty_struct *tty, struct file *file,
unsigned int mflag, mstat;
unsigned char startc, stopc;
struct board_chan __iomem *bc;
- struct channel *ch = (struct channel *) tty->driver_data;
+ struct channel *ch = tty->driver_data;
void __user *argp = (void __user *)arg;
if (ch)
@@ -2352,15 +2238,16 @@ static void do_softint(struct work_struct *work)
struct channel *ch = container_of(work, struct channel, tqueue);
/* Called in response to a modem change event */
if (ch && ch->magic == EPCA_MAGIC) {
- struct tty_struct *tty = ch->port.tty;
+ struct tty_struct *tty = tty_port_tty_get(&ch->port);;
if (tty && tty->driver_data) {
if (test_and_clear_bit(EPCA_EVENT_HANGUP, &ch->event)) {
tty_hangup(tty);
wake_up_interruptible(&ch->port.open_wait);
- ch->port.flags &= ~ASYNC_NORMAL_ACTIVE;
+ clear_bit(ASYNC_NORMAL_ACTIVE, &ch->port.flags);
}
}
+ tty_kref_put(tty);
}
}
@@ -2473,7 +2360,7 @@ static void pc_unthrottle(struct tty_struct *tty)
static int pc_send_break(struct tty_struct *tty, int msec)
{
- struct channel *ch = (struct channel *) tty->driver_data;
+ struct channel *ch = tty->driver_data;
unsigned long flags;
if (msec == -1)
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-11-23 08:27:02 +0000