[PATCH 03/20] epca: use tty_port

[Alan Cox <alan@lxorguk.ukuu.org.uk>]

From: Alan Cox <alan@redhat.com>

Switch the EPCA driver to include and begin using a tty_port structure
---

 drivers/char/epca.c |  106 ++++++++++++++++++++++++++-------------------------
 drivers/char/epca.h |    7 ---
 2 files changed, 54 insertions(+), 59 deletions(-)


diff --git a/drivers/char/epca.c b/drivers/char/epca.c
index 60a4df7..d26752b 100644
--- a/drivers/char/epca.c
+++ b/drivers/char/epca.c
@@ -432,7 +432,7 @@ static void pc_close(struct tty_struct *tty, struct file *filp)
 			spin_unlock_irqrestore(&epca_lock, flags);
 			return;
 		}
-		if (ch->count-- > 1)  {
+		if (ch->port.count-- > 1)  {
 			/* Begin channel is open more than once */
 			/*
 			 * Return without doing anything. Someone might still
@@ -442,19 +442,19 @@ static void pc_close(struct tty_struct *tty, struct file *filp)
 			return;
 		}
 		/* Port open only once go ahead with shutdown & reset */
-		BUG_ON(ch->count < 0);
+		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->asyncflags |= ASYNC_CLOSING;
+		ch->port.flags |= ASYNC_CLOSING;
 		tty->closing = 1;
 
 		spin_unlock_irqrestore(&epca_lock, flags);
 
-		if (ch->asyncflags & ASYNC_INITIALIZED)  {
+		if (ch->port.flags & ASYNC_INITIALIZED)  {
 			/* Setup an event to indicate when the
 			   transmit buffer empties */
 			setup_empty_event(tty, ch);
@@ -469,17 +469,17 @@ static void pc_close(struct tty_struct *tty, struct file *filp)
 		spin_lock_irqsave(&epca_lock, flags);
 		tty->closing = 0;
 		ch->event = 0;
-		ch->tty = NULL;
+		ch->port.tty = NULL;
 		spin_unlock_irqrestore(&epca_lock, flags);
 
-		if (ch->blocked_open) {
+		if (ch->port.blocked_open) {
 			if (ch->close_delay)
 				msleep_interruptible(jiffies_to_msecs(ch->close_delay));
-			wake_up_interruptible(&ch->open_wait);
+			wake_up_interruptible(&ch->port.open_wait);
 		}
-		ch->asyncflags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_INITIALIZED |
+		ch->port.flags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_INITIALIZED |
 					ASYNC_CLOSING);
-		wake_up_interruptible(&ch->close_wait);
+		wake_up_interruptible(&ch->port.close_wait);
 	}
 }
 
@@ -489,7 +489,7 @@ static void shutdown(struct channel *ch)
 	struct tty_struct *tty;
 	struct board_chan __iomem *bc;
 
-	if (!(ch->asyncflags & ASYNC_INITIALIZED))
+	if (!(ch->port.flags & ASYNC_INITIALIZED))
 		return;
 
 	spin_lock_irqsave(&epca_lock, flags);
@@ -504,7 +504,7 @@ static void shutdown(struct channel *ch)
 	 */
 	if (bc)
 		writeb(0, &bc->idata);
-	tty = ch->tty;
+	tty = ch->port.tty;
 
 	/* If we're a modem control device and HUPCL is on, drop RTS & DTR. */
 	if (tty->termios->c_cflag & HUPCL)  {
@@ -518,7 +518,7 @@ 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->asyncflags &= ~ASYNC_INITIALIZED;
+	ch->port.flags &= ~ASYNC_INITIALIZED;
 	spin_unlock_irqrestore(&epca_lock, flags);
 }
 
@@ -538,12 +538,12 @@ static void pc_hangup(struct tty_struct *tty)
 		shutdown(ch);
 
 		spin_lock_irqsave(&epca_lock, flags);
-		ch->tty   = NULL;
+		ch->port.tty   = NULL;
 		ch->event = 0;
-		ch->count = 0;
-		ch->asyncflags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_INITIALIZED);
+		ch->port.count = 0;
+		ch->port.flags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_INITIALIZED);
 		spin_unlock_irqrestore(&epca_lock, flags);
-		wake_up_interruptible(&ch->open_wait);
+		wake_up_interruptible(&ch->port.open_wait);
 	}
 }
 
@@ -795,7 +795,7 @@ static int block_til_ready(struct tty_struct *tty,
 	unsigned long flags;
 
 	if (tty_hung_up_p(filp)) {
-		if (ch->asyncflags & ASYNC_HUP_NOTIFY)
+		if (ch->port.flags & ASYNC_HUP_NOTIFY)
 			retval = -EAGAIN;
 		else
 			retval = -ERESTARTSYS;
@@ -806,10 +806,10 @@ static int block_til_ready(struct tty_struct *tty,
 	 * If the device is in the middle of being closed, then block until
 	 * it's done, and then try again.
 	 */
-	if (ch->asyncflags & ASYNC_CLOSING) {
-		interruptible_sleep_on(&ch->close_wait);
+	if (ch->port.flags & ASYNC_CLOSING) {
+		interruptible_sleep_on(&ch->port.close_wait);
 
-		if (ch->asyncflags & ASYNC_HUP_NOTIFY)
+		if (ch->port.flags & ASYNC_HUP_NOTIFY)
 			return -EAGAIN;
 		else
 			return -ERESTARTSYS;
@@ -820,7 +820,7 @@ static int block_til_ready(struct tty_struct *tty,
 		 * If non-blocking mode is set, then make the check up front
 		 * and then exit.
 		 */
-		ch->asyncflags |= ASYNC_NORMAL_ACTIVE;
+		ch->port.flags |= ASYNC_NORMAL_ACTIVE;
 		return 0;
 	}
 	if (tty->termios->c_cflag & CLOCAL)
@@ -828,24 +828,24 @@ static int block_til_ready(struct tty_struct *tty,
 	/* Block waiting for the carrier detect and the line to become free */
 
 	retval = 0;
-	add_wait_queue(&ch->open_wait, &wait);
+	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->count--;
-	ch->blocked_open++;
+		ch->port.count--;
+	ch->port.blocked_open++;
 	while (1) {
 		set_current_state(TASK_INTERRUPTIBLE);
 		if (tty_hung_up_p(filp) ||
-				!(ch->asyncflags & ASYNC_INITIALIZED)) {
-			if (ch->asyncflags & ASYNC_HUP_NOTIFY)
+				!(ch->port.flags & ASYNC_INITIALIZED)) {
+			if (ch->port.flags & ASYNC_HUP_NOTIFY)
 				retval = -EAGAIN;
 			else
 				retval = -ERESTARTSYS;
 			break;
 		}
-		if (!(ch->asyncflags & ASYNC_CLOSING) &&
+		if (!(ch->port.flags & ASYNC_CLOSING) &&
 			  (do_clocal || (ch->imodem & ch->dcd)))
 			break;
 		if (signal_pending(current)) {
@@ -864,17 +864,17 @@ static int block_til_ready(struct tty_struct *tty,
 	}
 
 	__set_current_state(TASK_RUNNING);
-	remove_wait_queue(&ch->open_wait, &wait);
+	remove_wait_queue(&ch->port.open_wait, &wait);
 	if (!tty_hung_up_p(filp))
-		ch->count++;
-	ch->blocked_open--;
+		ch->port.count++;
+	ch->port.blocked_open--;
 
 	spin_unlock_irqrestore(&epca_lock, flags);
 
 	if (retval)
 		return retval;
 
-	ch->asyncflags |= ASYNC_NORMAL_ACTIVE;
+	ch->port.flags |= ASYNC_NORMAL_ACTIVE;
 	return 0;
 }
 
@@ -933,7 +933,7 @@ static int pc_open(struct tty_struct *tty, struct file *filp)
 	 * necessary because we do not wish to flush and shutdown the channel
 	 * until the last app holding the channel open, closes it.
 	 */
-	ch->count++;
+	ch->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.
@@ -957,14 +957,14 @@ static int pc_open(struct tty_struct *tty, struct file *filp)
 	writew(head, &bc->rout);
 
 	/* Set the channels associated tty structure */
-	ch->tty = tty;
+	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->asyncflags |= ASYNC_INITIALIZED;
+	ch->port.flags |= ASYNC_INITIALIZED;
 	memoff(ch);
 	spin_unlock_irqrestore(&epca_lock, flags);
 
@@ -976,7 +976,7 @@ static int pc_open(struct tty_struct *tty, struct file *filp)
 	 * waiting for the line...
 	 */
 	spin_lock_irqsave(&epca_lock, flags);
-	ch->tty = tty;
+	ch->port.tty = tty;
 	globalwinon(ch);
 	/* Enable Digi Data events */
 	writeb(1, &bc->idata);
@@ -1017,8 +1017,8 @@ static void __exit epca_module_exit(void)
 		}
 		ch = card_ptr[crd];
 		for (count = 0; count < bd->numports; count++, ch++) {
-			if (ch && ch->tty)
-				tty_hangup(ch->tty);
+			if (ch && ch->port.tty)
+				tty_hangup(ch->port.tty);
 		}
 	}
 	pci_unregister_driver(&epca_driver);
@@ -1427,7 +1427,7 @@ static void post_fep_init(unsigned int crd)
 		ch->boardnum   = crd;
 		ch->channelnum = i;
 		ch->magic      = EPCA_MAGIC;
-		ch->tty        = NULL;
+		ch->port.tty        = NULL;
 
 		if (shrinkmem) {
 			fepcmd(ch, SETBUFFER, 32, 0, 0, 0);
@@ -1510,10 +1510,10 @@ static void post_fep_init(unsigned int crd)
 		ch->fepstopca = 0;
 
 		ch->close_delay = 50;
-		ch->count = 0;
-		ch->blocked_open = 0;
-		init_waitqueue_head(&ch->open_wait);
-		init_waitqueue_head(&ch->close_wait);
+		ch->port.count = 0;
+		ch->port.blocked_open = 0;
+		init_waitqueue_head(&ch->port.open_wait);
+		init_waitqueue_head(&ch->port.close_wait);
 
 		spin_unlock_irqrestore(&epca_lock, flags);
 	}
@@ -1633,15 +1633,15 @@ static void doevent(int crd)
 		if (event & MODEMCHG_IND) {
 			/* A modem signal change has been indicated */
 			ch->imodem = mstat;
-			if (ch->asyncflags & ASYNC_CHECK_CD) {
+			if (ch->port.flags & ASYNC_CHECK_CD) {
 				/* We are now receiving dcd */
 				if (mstat & ch->dcd)
-					wake_up_interruptible(&ch->open_wait);
+					wake_up_interruptible(&ch->port.open_wait);
 				else	/* No dcd; hangup */
 					pc_sched_event(ch, EPCA_EVENT_HANGUP);
 			}
 		}
-		tty = ch->tty;
+		tty = ch->port.tty;
 		if (tty) {
 			if (event & BREAK_IND) {
 				/* A break has been indicated */
@@ -1880,9 +1880,9 @@ static void epcaparam(struct tty_struct *tty, struct channel *ch)
 		 * that the driver will wait on carrier detect.
 		 */
 		if (ts->c_cflag & CLOCAL)
-			ch->asyncflags &= ~ASYNC_CHECK_CD;
+			ch->port.flags &= ~ASYNC_CHECK_CD;
 		else
-			ch->asyncflags |= ASYNC_CHECK_CD;
+			ch->port.flags |= ASYNC_CHECK_CD;
 		mval = ch->m_dtr | ch->m_rts;
 	} /* End CBAUD not detected */
 	iflag = termios2digi_i(ch, ts->c_iflag);
@@ -1972,7 +1972,7 @@ static void receive_data(struct channel *ch)
 	globalwinon(ch);
 	if (ch->statusflags & RXSTOPPED)
 		return;
-	tty = ch->tty;
+	tty = ch->port.tty;
 	if (tty)
 		ts = tty->termios;
 	bc = ch->brdchan;
@@ -2032,7 +2032,7 @@ static void receive_data(struct channel *ch)
 	globalwinon(ch);
 	writew(tail, &bc->rout);
 	/* Must be called with global data */
-	tty_schedule_flip(ch->tty);
+	tty_schedule_flip(ch->port.tty);
 }
 
 static int info_ioctl(struct tty_struct *tty, struct file *file,
@@ -2376,7 +2376,7 @@ static void pc_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
 
 		if (!(old_termios->c_cflag & CLOCAL) &&
 			 (tty->termios->c_cflag & CLOCAL))
-			wake_up_interruptible(&ch->open_wait);
+			wake_up_interruptible(&ch->port.open_wait);
 
 	} /* End if channel valid */
 }
@@ -2386,13 +2386,13 @@ 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->tty;
+		struct tty_struct *tty = ch->port.tty;
 
 		if (tty && tty->driver_data) {
 			if (test_and_clear_bit(EPCA_EVENT_HANGUP, &ch->event)) {
 				tty_hangup(tty);
-				wake_up_interruptible(&ch->open_wait);
-				ch->asyncflags &= ~ASYNC_NORMAL_ACTIVE;
+				wake_up_interruptible(&ch->port.open_wait);
+				ch->port.flags &= ~ASYNC_NORMAL_ACTIVE;
 			}
 		}
 	}
diff --git a/drivers/char/epca.h b/drivers/char/epca.h
index 3c77c02..d414bf2 100644
--- a/drivers/char/epca.h
+++ b/drivers/char/epca.h
@@ -84,6 +84,7 @@ static char *board_desc[] =
 struct channel 
 {
 	long   magic;
+	struct tty_port port;
 	unsigned char boardnum;
 	unsigned char channelnum;
 	unsigned char omodem;         /* FEP output modem status     */
@@ -117,10 +118,7 @@ struct channel
 	unsigned short rxbufhead;
 	unsigned short rxbufsize;
 	int    close_delay;
-	int    count;
-	int    blocked_open;
 	unsigned long  event;
-	int    asyncflags;
 	uint   dev;
 	unsigned long  statusflags;
 	unsigned long  c_iflag;
@@ -132,9 +130,6 @@ struct channel
 	struct board_info           *board;
 	struct board_chan	    __iomem *brdchan;
 	struct digi_struct          digiext;
-	struct tty_struct           *tty;
-	wait_queue_head_t           open_wait;
-	wait_queue_head_t           close_wait;
 	struct work_struct          tqueue;
 	struct global_data 	    __iomem *mailbox;
 };