[PATCH 33/75] tty: Pull the dtr raise into tty port

Alan Cox
2009-01-02T13:46:06Z

From: Alan Cox <alan@redhat.com>

This moves another per device special out of what should be shared open
wait paths into private methods

Signed-off-by: Alan Cox <alan@redhat.com>
---

drivers/char/isicom.c | 13 ++++++++-----
drivers/char/mxser.c | 17 +++++++++++++----
drivers/char/rocket.c | 14 ++++++++++----
drivers/char/synclink.c | 21 +++++++++++++++------
drivers/char/synclink_gt.c | 21 +++++++++++++++------
drivers/char/tty_port.c | 16 ++++++++++++++++
include/linux/tty.h | 2 ++
7 files changed, 79 insertions(+), 25 deletions(-)

diff --git a/drivers/char/isicom.c b/drivers/char/isicom.c
index b3da485..a449449 100644
--- a/drivers/char/isicom.c
+++ b/drivers/char/isicom.c
@@ -328,11 +328,13 @@ static inline void drop_rts(struct isi_port *port)
}

/* card->lock MUST NOT be held */
-static inline void raise_dtr_rts(struct isi_port *port)
+
+static void isicom_raise_dtr_rts(struct tty_port *port)
{
- struct isi_board *card = port->card;
+ struct isi_port *ip = container_of(port, struct isi_port, port);
+ struct isi_board *card = ip->card;
unsigned long base = card->base;
- u16 channel = port->channel;
+ u16 channel = ip->channel;

if (!lock_card(card))
return;
@@ -340,7 +342,7 @@ static inline void raise_dtr_rts(struct isi_port *port)
outw(0x8000 | (channel << card->shift_count) | 0x02, base);
outw(0x0f04, base);
InterruptTheCard(base);
- port->status |= (ISI_DTR | ISI_RTS);
+ ip->status |= (ISI_DTR | ISI_RTS);
unlock_card(card);
}

@@ -881,7 +883,7 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp,
spin_unlock_irqrestore(&card->card_lock, flags);

while (1) {
- raise_dtr_rts(ip);
+ tty_port_raise_dtr_rts(port);

set_current_state(TASK_INTERRUPTIBLE);
if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)) {
@@ -1462,6 +1464,7 @@ static const struct tty_operations isicom_ops = {

static const struct tty_port_operations isicom_port_ops = {
.carrier_raised = isicom_carrier_raised,
+ .raise_dtr_rts = isicom_raise_dtr_rts,
};

static int __devinit reset_card(struct pci_dev *pdev,
diff --git a/drivers/char/mxser.c b/drivers/char/mxser.c
index eafbbcf..ff5ff61 100644
--- a/drivers/char/mxser.c
+++ b/drivers/char/mxser.c
@@ -547,6 +547,17 @@ static int mxser_carrier_raised(struct tty_port *port)
return (inb(mp->ioaddr + UART_MSR) & UART_MSR_DCD)?1:0;
}

+static void mxser_raise_dtr_rts(struct tty_port *port)
+{
+ struct mxser_port *mp = container_of(port, struct mxser_port, port);
+ unsigned long 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);
+}
+
static int mxser_block_til_ready(struct tty_struct *tty, struct file *filp,
struct mxser_port *mp)
{
@@ -586,10 +597,7 @@ static int mxser_block_til_ready(struct tty_struct *tty, struct file *filp,
spin_unlock_irqrestore(&mp->slock, flags);
port->blocked_open++;
while (1) {
- 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);
+ tty_port_raise_dtr_rts(port);
set_current_state(TASK_INTERRUPTIBLE);
if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)) {
if (port->flags & ASYNC_HUP_NOTIFY)
@@ -2458,6 +2466,7 @@ static const struct tty_operations mxser_ops = {

struct tty_port_operations mxser_port_ops = {
.carrier_raised = mxser_carrier_raised,
+ .raise_dtr_rts = mxser_raise_dtr_rts,
};

/*
diff --git a/drivers/char/rocket.c b/drivers/char/rocket.c
index 4a4110e..f4d9c39 100644
--- a/drivers/char/rocket.c
+++ b/drivers/char/rocket.c
@@ -870,6 +870,13 @@ static int carrier_raised(struct tty_port *port)
return (sGetChanStatusLo(&info->channel) & CD_ACT) ? 1 : 0;
}

+static void raise_dtr_rts(struct tty_port *port)
+{
+ struct r_port *info = container_of(port, struct r_port, port);
+ sSetDTR(&info->channel);
+ sSetRTS(&info->channel);
+}
+
/* 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)
@@ -928,10 +935,8 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp,
spin_unlock_irqrestore(&info->slock, flags);

while (1) {
- if (tty->termios->c_cflag & CBAUD) {
- sSetDTR(&info->channel);
- sSetRTS(&info->channel);
- }
+ if (tty->termios->c_cflag & CBAUD)
+ tty_port_raise_dtr_rts(port);
set_current_state(TASK_INTERRUPTIBLE);
if (tty_hung_up_p(filp) || !(info->flags & ROCKET_INITIALIZED)) {
if (info->flags & ROCKET_HUP_NOTIFY)
@@ -2381,6 +2386,7 @@ static const struct tty_operations rocket_ops = {

static const struct tty_port_operations rocket_port_ops = {
.carrier_raised = carrier_raised,
+ .raise_dtr_rts = raise_dtr_rts,
};

/*
diff --git a/drivers/char/synclink.c b/drivers/char/synclink.c
index fb2e6b5..ac9f21e 100644
--- a/drivers/char/synclink.c
+++ b/drivers/char/synclink.c
@@ -3298,6 +3298,18 @@ static int carrier_raised(struct tty_port *port)
return (info->serial_signals & SerialSignal_DCD) ? 1 : 0;
}

+static void raise_dtr_rts(struct tty_port *port)
+{
+ struct mgsl_struct *info = container_of(port, struct mgsl_struct, port);
+ unsigned long flags;
+
+ spin_lock_irqsave(&info->irq_spinlock,flags);
+ info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
+ usc_set_serial_signals(info);
+ spin_unlock_irqrestore(&info->irq_spinlock,flags);
+}
+
+
/* block_til_ready()
*
* Block the current process until the specified port
@@ -3358,12 +3370,8 @@ static int block_til_ready(struct tty_struct *tty, struct file * filp,
port->blocked_open++;

while (1) {
- if (tty->termios->c_cflag & CBAUD) {
- spin_lock_irqsave(&info->irq_spinlock,flags);
- info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
- usc_set_serial_signals(info);
- spin_unlock_irqrestore(&info->irq_spinlock,flags);
- }
+ if (tty->termios->c_cflag & CBAUD)
+ tty_port_raise_dtr_rts(port);

set_current_state(TASK_INTERRUPTIBLE);

@@ -4321,6 +4329,7 @@ static void mgsl_add_device( struct mgsl_struct *info )

static const struct tty_port_operations mgsl_port_ops = {
.carrier_raised = carrier_raised,
+ .raise_dtr_rts = raise_dtr_rts,
};

diff --git a/drivers/char/synclink_gt.c b/drivers/char/synclink_gt.c
index 39ccaba..625c9bd 100644
--- a/drivers/char/synclink_gt.c
+++ b/drivers/char/synclink_gt.c
@@ -3143,6 +3143,18 @@ static int carrier_raised(struct tty_port *port)
return (info->signals & SerialSignal_DCD) ? 1 : 0;
}

+static void raise_dtr_rts(struct tty_port *port)
+{
+ unsigned long flags;
+ struct slgt_info *info = container_of(port, struct slgt_info, port);
+
+ spin_lock_irqsave(&info->lock,flags);
+ info->signals |= SerialSignal_RTS + SerialSignal_DTR;
+ set_signals(info);
+ spin_unlock_irqrestore(&info->lock,flags);
+}
+
+
/*
* block current process until the device is ready to open
*/
@@ -3187,12 +3199,8 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp,
port->blocked_open++;

while (1) {
- if ((tty->termios->c_cflag & CBAUD)) {
- spin_lock_irqsave(&info->lock,flags);
- info->signals |= SerialSignal_RTS + SerialSignal_DTR;
- set_signals(info);
- spin_unlock_irqrestore(&info->lock,flags);
- }
+ if ((tty->termios->c_cflag & CBAUD))
+ tty_port_raise_dtr_rts(port);

set_current_state(TASK_INTERRUPTIBLE);

@@ -3455,6 +3463,7 @@ static void add_device(struct slgt_info *info)

static const struct tty_port_operations slgt_port_ops = {
.carrier_raised = carrier_raised,
+ .raise_dtr_rts = raise_dtr_rts,
};

/*
diff --git a/drivers/char/tty_port.c b/drivers/char/tty_port.c
index f54e40c..0557b63 100644
--- a/drivers/char/tty_port.c
+++ b/drivers/char/tty_port.c
@@ -111,3 +111,19 @@ int tty_port_carrier_raised(struct tty_port *port)
return port->ops->carrier_raised(port);
}
EXPORT_SYMBOL(tty_port_carrier_raised);
+
+/**
+ * tty_port_raise_dtr_rts - Riase DTR/RTS
+ * @port: tty port
+ *
+ * Wrapper for the DTR/RTS raise logic. For the moment this is used
+ * to hide some internal details. This will eventually become entirely
+ * internal to the tty port.
+ */
+
+void tty_port_raise_dtr_rts(struct tty_port *port)
+{
+ if (port->ops->raise_dtr_rts)
+ port->ops->raise_dtr_rts(port);
+}
+EXPORT_SYMBOL(tty_port_raise_dtr_rts);
diff --git a/include/linux/tty.h b/include/linux/tty.h
index bc7bae7..5001bbc 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -185,6 +185,7 @@ struct tty_port;
struct tty_port_operations {
/* Return 1 if the carrier is raised */
int (*carrier_raised)(struct tty_port *port);
+ void (*raise_dtr_rts)(struct tty_port *port);
};

struct tty_port {
@@ -436,6 +437,7 @@ 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 void tty_port_raise_dtr_rts(struct tty_port *port);

extern int tty_register_ldisc(int disc, struct tty_ldisc_ops *new_ldisc);
extern int tty_unregister_ldisc(int disc);