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tty: istallion: tty port open/close methods

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Slice/dice/repeat as with the stallion driver this is just code shuffling
and removal

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Cox 2009-11-30 13:17:08 +00:00 committed by Greg Kroah-Hartman
parent 047e9658ae
commit 338818fd80
1 changed files with 62 additions and 119 deletions
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181
drivers/char/istallion.c
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@ -213,7 +213,6 @@ static int stli_shared;
* with the slave. Most of them need to be updated atomically, so always
* use the bit setting operations (unless protected by cli/sti).
*/
#define ST_INITIALIZING 1
#define ST_OPENING 2
#define ST_CLOSING 3
#define ST_CMDING 4
@ -783,13 +782,32 @@ static int stli_parsebrd(struct stlconf *confp, char **argp)
/*****************************************************************************/
/*
* On the first open of the device setup the port hardware, and
* initialize the per port data structure. Since initializing the port
* requires several commands to the board we will need to wait for any
* other open that is already initializing the port.
*
* Locking: protected by the port mutex.
*/
static int stli_activate(struct tty_port *port, struct tty_struct *tty)
{
struct stliport *portp = container_of(port, struct stliport, port);
struct stlibrd *brdp = stli_brds[portp->brdnr];
int rc;
if ((rc = stli_initopen(tty, brdp, portp)) >= 0)
clear_bit(TTY_IO_ERROR, &tty->flags);
wake_up_interruptible(&portp->raw_wait);
return rc;
}
static int stli_open(struct tty_struct *tty, struct file *filp)
{
struct stlibrd *brdp;
struct stliport *portp;
struct tty_port *port;
unsigned int minordev, brdnr, portnr;
int rc;
minordev = tty->index;
brdnr = MINOR2BRD(minordev);
@ -809,95 +827,56 @@ static int stli_open(struct tty_struct *tty, struct file *filp)
return -ENODEV;
if (portp->devnr < 1)
return -ENODEV;
port = &portp->port;
/*
* On the first open of the device setup the port hardware, and
* initialize the per port data structure. Since initializing the port
* requires several commands to the board we will need to wait for any
* other open that is already initializing the port.
*
* Review - locking
*/
tty_port_tty_set(port, tty);
tty->driver_data = portp;
port->count++;
wait_event_interruptible(portp->raw_wait,
!test_bit(ST_INITIALIZING, &portp->state));
if (signal_pending(current))
return -ERESTARTSYS;
if ((portp->port.flags & ASYNC_INITIALIZED) == 0) {
set_bit(ST_INITIALIZING, &portp->state);
if ((rc = stli_initopen(tty, brdp, portp)) >= 0) {
/* Locking */
port->flags |= ASYNC_INITIALIZED;
clear_bit(TTY_IO_ERROR, &tty->flags);
}
clear_bit(ST_INITIALIZING, &portp->state);
wake_up_interruptible(&portp->raw_wait);
if (rc < 0)
return rc;
}
return tty_port_block_til_ready(&portp->port, tty, filp);
return tty_port_open(&portp->port, tty, filp);
}
/*****************************************************************************/
static void stli_close(struct tty_struct *tty, struct file *filp)
static void stli_shutdown(struct tty_port *port)
{
struct stlibrd *brdp;
struct stliport *portp;
struct tty_port *port;
unsigned long ftype;
unsigned long flags;
struct stliport *portp = container_of(port, struct stliport, port);
portp = tty->driver_data;
if (portp->brdnr >= stli_nrbrds)
return;
brdp = stli_brds[portp->brdnr];
if (brdp == NULL)
return;
/*
* May want to wait for data to drain before closing. The BUSY
* flag keeps track of whether we are still transmitting or not.
* It is updated by messages from the slave - indicating when all
* chars really have drained.
*/
if (!test_bit(ST_CLOSING, &portp->state))
stli_rawclose(brdp, portp, 0, 0);
spin_lock_irqsave(&stli_lock, flags);
clear_bit(ST_TXBUSY, &portp->state);
clear_bit(ST_RXSTOP, &portp->state);
spin_unlock_irqrestore(&stli_lock, flags);
ftype = FLUSHTX | FLUSHRX;
stli_cmdwait(brdp, portp, A_FLUSH, &ftype, sizeof(u32), 0);
}
static void stli_close(struct tty_struct *tty, struct file *filp)
{
struct stliport *portp = tty->driver_data;
unsigned long flags;
if (portp == NULL)
return;
port = &portp->port;
if (tty_port_close_start(port, tty, filp) == 0)
return;
/*
* May want to wait for data to drain before closing. The BUSY flag
* keeps track of whether we are still transmitting or not. It is
* updated by messages from the slave - indicating when all chars
* really have drained.
*/
spin_lock_irqsave(&stli_lock, flags);
/* Flush any internal buffering out first */
if (tty == stli_txcooktty)
stli_flushchars(tty);
spin_unlock_irqrestore(&stli_lock, flags);
/* We end up doing this twice for the moment. This needs looking at
eventually. Note we still use portp->closing_wait as a result */
if (portp->closing_wait != ASYNC_CLOSING_WAIT_NONE)
tty_wait_until_sent(tty, portp->closing_wait);
/* FIXME: port locking here needs attending to */
port->flags &= ~ASYNC_INITIALIZED;
brdp = stli_brds[portp->brdnr];
stli_rawclose(brdp, portp, 0, 0);
if (tty->termios->c_cflag & HUPCL) {
stli_mkasysigs(&portp->asig, 0, 0);
if (test_bit(ST_CMDING, &portp->state))
set_bit(ST_DOSIGS, &portp->state);
else
stli_sendcmd(brdp, portp, A_SETSIGNALS, &portp->asig,
sizeof(asysigs_t), 0);
}
clear_bit(ST_TXBUSY, &portp->state);
clear_bit(ST_RXSTOP, &portp->state);
set_bit(TTY_IO_ERROR, &tty->flags);
tty_ldisc_flush(tty);
set_bit(ST_DOFLUSHRX, &portp->state);
stli_flushbuffer(tty);
tty_port_close_end(port, tty);
tty_port_tty_set(port, NULL);
tty_port_close(&portp->port, tty, filp);
}
/*****************************************************************************/
@ -1724,6 +1703,7 @@ static void stli_start(struct tty_struct *tty)
/*****************************************************************************/
/*
* Hangup this port. This is pretty much like closing the port, only
* a little more brutal. No waiting for data to drain. Shutdown the
@ -1733,47 +1713,8 @@ static void stli_start(struct tty_struct *tty)
static void stli_hangup(struct tty_struct *tty)
{
struct stliport *portp;
struct stlibrd *brdp;
struct tty_port *port;
unsigned long flags;
portp = tty->driver_data;
if (portp == NULL)
return;
if (portp->brdnr >= stli_nrbrds)
return;
brdp = stli_brds[portp->brdnr];
if (brdp == NULL)
return;
port = &portp->port;
spin_lock_irqsave(&port->lock, flags);
port->flags &= ~ASYNC_INITIALIZED;
spin_unlock_irqrestore(&port->lock, flags);
if (!test_bit(ST_CLOSING, &portp->state))
stli_rawclose(brdp, portp, 0, 0);
spin_lock_irqsave(&stli_lock, flags);
if (tty->termios->c_cflag & HUPCL) {
stli_mkasysigs(&portp->asig, 0, 0);
if (test_bit(ST_CMDING, &portp->state)) {
set_bit(ST_DOSIGS, &portp->state);
set_bit(ST_DOFLUSHTX, &portp->state);
set_bit(ST_DOFLUSHRX, &portp->state);
} else {
stli_sendcmd(brdp, portp, A_SETSIGNALSF,
&portp->asig, sizeof(asysigs_t), 0);
}
}
clear_bit(ST_TXBUSY, &portp->state);
clear_bit(ST_RXSTOP, &portp->state);
set_bit(TTY_IO_ERROR, &tty->flags);
spin_unlock_irqrestore(&stli_lock, flags);
tty_port_hangup(port);
struct stliport *portp = tty->driver_data;
tty_port_hangup(&portp->port);
}
/*****************************************************************************/
@ -4420,6 +4361,8 @@ static const struct tty_operations stli_ops = {
static const struct tty_port_operations stli_port_ops = {
.carrier_raised = stli_carrier_raised,
.dtr_rts = stli_dtr_rts,
.activate = stli_activate,
.shutdown = stli_shutdown,
};
/*****************************************************************************/