* PURPOSE. See the GNU General Public License for more details.
*/
-/************************************************************************
- *
+/*
* This file implements the tty driver functionality for the
* Neo and ClassicBoard PCI based product lines.
- *
- ************************************************************************
- *
*/
#include <linux/kernel.h>
#include "dgnc_tty.h"
#include "dgnc_neo.h"
#include "dgnc_cls.h"
-#include "dgnc_sysfs.h"
#include "dgnc_utils.h"
-/*
- * internal variables
- */
-static struct dgnc_board *dgnc_BoardsByMajor[256];
-static unsigned char *dgnc_TmpWriteBuf;
-
-/*
- * Default transparent print information.
- */
-static struct digi_t dgnc_digi_init = {
- .digi_flags = DIGI_COOK, /* Flags */
- .digi_maxcps = 100, /* Max CPS */
- .digi_maxchar = 50, /* Max chars in print queue */
- .digi_bufsize = 100, /* Printer buffer size */
- .digi_onlen = 4, /* size of printer on string */
- .digi_offlen = 4, /* size of printer off string */
- .digi_onstr = "\033[5i", /* ANSI printer on string ] */
- .digi_offstr = "\033[4i", /* ANSI printer off string ] */
- .digi_term = "ansi" /* default terminal type */
+/* Default transparent print information. */
+
+static const struct digi_t dgnc_digi_init = {
+ .digi_flags = DIGI_COOK, /* Flags */
+ .digi_maxcps = 100, /* Max CPS */
+ .digi_maxchar = 50, /* Max chars in print queue */
+ .digi_bufsize = 100, /* Printer buffer size */
+ .digi_onlen = 4, /* size of printer on string */
+ .digi_offlen = 4, /* size of printer off string */
+ .digi_onstr = "\033[5i", /* ANSI printer on string ] */
+ .digi_offstr = "\033[4i", /* ANSI printer off string ] */
+ .digi_term = "ansi" /* default terminal type */
};
/*
* This defines a raw port at 9600 baud, 8 data bits, no parity,
* 1 stop bit.
*/
-static struct ktermios DgncDefaultTermios = {
+static struct ktermios default_termios = {
.c_iflag = (DEFAULT_IFLAGS), /* iflags */
.c_oflag = (DEFAULT_OFLAGS), /* oflags */
.c_cflag = (DEFAULT_CFLAGS), /* cflags */
static void dgnc_tty_flush_chars(struct tty_struct *tty);
static void dgnc_tty_flush_buffer(struct tty_struct *tty);
static void dgnc_tty_hangup(struct tty_struct *tty);
-static int dgnc_set_modem_info(struct tty_struct *tty, unsigned int command,
+static int dgnc_set_modem_info(struct channel_t *ch, unsigned int command,
unsigned int __user *value);
static int dgnc_get_modem_info(struct channel_t *ch,
unsigned int __user *value);
static void dgnc_tty_set_termios(struct tty_struct *tty,
struct ktermios *old_termios);
static void dgnc_tty_send_xchar(struct tty_struct *tty, char ch);
+static void dgnc_set_signal_low(struct channel_t *ch, const unsigned char line);
+static void dgnc_wake_up_unit(struct un_t *unit);
static const struct tty_operations dgnc_tty_ops = {
.open = dgnc_tty_open,
.send_xchar = dgnc_tty_send_xchar
};
-/************************************************************************
- *
- * TTY Initialization/Cleanup Functions
- *
- ************************************************************************/
-
-/*
- * dgnc_tty_preinit()
- *
- * Initialize any global tty related data before we download any boards.
- */
-int dgnc_tty_preinit(void)
-{
- /*
- * Allocate a buffer for doing the copy from user space to
- * kernel space in dgnc_write(). We only use one buffer and
- * control access to it with a semaphore. If we are paging, we
- * are already in trouble so one buffer won't hurt much anyway.
- *
- * We are okay to sleep in the malloc, as this routine
- * is only called during module load, (not in interrupt context),
- * and with no locks held.
- */
- dgnc_TmpWriteBuf = kmalloc(WRITEBUFLEN, GFP_KERNEL);
-
- if (!dgnc_TmpWriteBuf)
- return -ENOMEM;
-
- return 0;
-}
+/* TTY Initialization/Cleanup Functions */
/*
* dgnc_tty_register()
if (IS_ERR(brd->serial_driver))
return PTR_ERR(brd->serial_driver);
- snprintf(brd->serial_name, MAXTTYNAMELEN, "tty_dgnc_%d_", brd->boardnum);
+ snprintf(brd->serial_name, MAXTTYNAMELEN, "tty_dgnc_%d_",
+ brd->boardnum);
brd->serial_driver->name = brd->serial_name;
brd->serial_driver->name_base = 0;
brd->serial_driver->minor_start = 0;
brd->serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
brd->serial_driver->subtype = SERIAL_TYPE_NORMAL;
- brd->serial_driver->init_termios = DgncDefaultTermios;
+ brd->serial_driver->init_termios = default_termios;
brd->serial_driver->driver_name = DRVSTR;
/*
*/
tty_set_operations(brd->serial_driver, &dgnc_tty_ops);
- if (!brd->dgnc_major_serial_registered) {
- /* Register tty devices */
- rc = tty_register_driver(brd->serial_driver);
- if (rc < 0) {
- dev_dbg(&brd->pdev->dev,
- "Can't register tty device (%d)\n", rc);
- goto free_serial_driver;
- }
- brd->dgnc_major_serial_registered = true;
+ rc = tty_register_driver(brd->serial_driver);
+ if (rc < 0) {
+ dev_dbg(&brd->pdev->dev,
+ "Can't register tty device (%d)\n", rc);
+ goto free_serial_driver;
}
/*
brd->print_driver->minor_start = 0x80;
brd->print_driver->type = TTY_DRIVER_TYPE_SERIAL;
brd->print_driver->subtype = SERIAL_TYPE_NORMAL;
- brd->print_driver->init_termios = DgncDefaultTermios;
+ brd->print_driver->init_termios = default_termios;
brd->print_driver->driver_name = DRVSTR;
/*
*/
tty_set_operations(brd->print_driver, &dgnc_tty_ops);
- if (!brd->dgnc_major_transparent_print_registered) {
- /* Register Transparent Print devices */
- rc = tty_register_driver(brd->print_driver);
- if (rc < 0) {
- dev_dbg(&brd->pdev->dev,
- "Can't register Transparent Print device(%d)\n",
- rc);
- goto free_print_driver;
- }
- brd->dgnc_major_transparent_print_registered = true;
+ rc = tty_register_driver(brd->print_driver);
+ if (rc < 0) {
+ dev_dbg(&brd->pdev->dev,
+ "Can't register Transparent Print device(%d)\n",
+ rc);
+ goto free_print_driver;
}
- dgnc_BoardsByMajor[brd->serial_driver->major] = brd;
-
return 0;
free_print_driver:
return rc;
}
+void dgnc_tty_unregister(struct dgnc_board *brd)
+{
+ tty_unregister_driver(brd->print_driver);
+ tty_unregister_driver(brd->serial_driver);
+ put_tty_driver(brd->print_driver);
+ put_tty_driver(brd->serial_driver);
+}
+
/*
* dgnc_tty_init()
*
if (!brd)
return -ENXIO;
- /*
- * Initialize board structure elements.
- */
+ /* Initialize board structure elements. */
vaddr = brd->re_map_membase;
classp = tty_register_device(brd->serial_driver, i,
&ch->ch_bd->pdev->dev);
ch->ch_tun.un_sysfs = classp;
- dgnc_create_tty_sysfs(&ch->ch_tun, classp);
classp = tty_register_device(brd->print_driver, i,
&ch->ch_bd->pdev->dev);
ch->ch_pun.un_sysfs = classp;
- dgnc_create_tty_sysfs(&ch->ch_pun, classp);
}
}
}
/*
- * dgnc_tty_post_uninit()
- *
- * UnInitialize any global tty related data.
- */
-void dgnc_tty_post_uninit(void)
-{
- kfree(dgnc_TmpWriteBuf);
- dgnc_TmpWriteBuf = NULL;
-}
-
-/*
- * dgnc_tty_uninit()
+ * dgnc_cleanup_tty()
*
* Uninitialize the TTY portion of this driver. Free all memory and
* resources.
*/
-void dgnc_tty_uninit(struct dgnc_board *brd)
+void dgnc_cleanup_tty(struct dgnc_board *brd)
{
int i = 0;
- if (brd->dgnc_major_serial_registered) {
- dgnc_BoardsByMajor[brd->serial_driver->major] = NULL;
- for (i = 0; i < brd->nasync; i++) {
- if (brd->channels[i])
- dgnc_remove_tty_sysfs(brd->channels[i]->
- ch_tun.un_sysfs);
- tty_unregister_device(brd->serial_driver, i);
- }
- tty_unregister_driver(brd->serial_driver);
- brd->dgnc_major_serial_registered = false;
- }
+ for (i = 0; i < brd->nasync; i++)
+ tty_unregister_device(brd->serial_driver, i);
- if (brd->dgnc_major_transparent_print_registered) {
- dgnc_BoardsByMajor[brd->print_driver->major] = NULL;
- for (i = 0; i < brd->nasync; i++) {
- if (brd->channels[i])
- dgnc_remove_tty_sysfs(brd->channels[i]->
- ch_pun.un_sysfs);
- tty_unregister_device(brd->print_driver, i);
- }
- tty_unregister_driver(brd->print_driver);
- brd->dgnc_major_transparent_print_registered = false;
- }
+ tty_unregister_driver(brd->serial_driver);
+
+ for (i = 0; i < brd->nasync; i++)
+ tty_unregister_device(brd->print_driver, i);
+
+ tty_unregister_driver(brd->print_driver);
put_tty_driver(brd->serial_driver);
put_tty_driver(brd->print_driver);
}
if (n > 0) {
- /*
- * Move rest of data.
- */
+ /* Move rest of data. */
remain = n;
memcpy(ch->ch_wqueue + head, buf, remain);
head += remain;
goto exit_unlock;
}
- /*
- * If we are throttled, simply don't read any data.
- */
+ /* If we are throttled, simply don't read any data. */
+
if (ch->ch_flags & CH_FORCED_STOPI)
goto exit_unlock;
tty_ldisc_deref(ld);
}
-/************************************************************************
+/*
* Determines when CARRIER changes state and takes appropriate
* action.
- ************************************************************************/
+ */
void dgnc_carrier(struct channel_t *ch)
{
- struct dgnc_board *bd;
-
int virt_carrier = 0;
int phys_carrier = 0;
if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
return;
- bd = ch->ch_bd;
-
- if (!bd || bd->magic != DGNC_BOARD_MAGIC)
- return;
-
if (ch->ch_mistat & UART_MSR_DCD)
phys_carrier = 1;
if (ch->ch_c_cflag & CLOCAL)
virt_carrier = 1;
- /*
- * Test for a VIRTUAL carrier transition to HIGH.
- */
+ /* Test for a VIRTUAL carrier transition to HIGH. */
+
if (((ch->ch_flags & CH_FCAR) == 0) && (virt_carrier == 1)) {
/*
* When carrier rises, wake any threads waiting
* for carrier in the open routine.
*/
-
if (waitqueue_active(&ch->ch_flags_wait))
wake_up_interruptible(&ch->ch_flags_wait);
}
- /*
- * Test for a PHYSICAL carrier transition to HIGH.
- */
+ /* Test for a PHYSICAL carrier transition to HIGH. */
+
if (((ch->ch_flags & CH_CD) == 0) && (phys_carrier == 1)) {
/*
* When carrier rises, wake any threads waiting
* for carrier in the open routine.
*/
-
if (waitqueue_active(&ch->ch_flags_wait))
wake_up_interruptible(&ch->ch_flags_wait);
}
tty_hangup(ch->ch_pun.un_tty);
}
- /*
- * Make sure that our cached values reflect the current reality.
- */
+ /* Make sure that our cached values reflect the current reality. */
+
if (virt_carrier == 1)
ch->ch_flags |= CH_FCAR;
else
ch->ch_flags &= ~CH_CD;
}
-/*
- * Assign the custom baud rate to the channel structure
- */
+/* Assign the custom baud rate to the channel structure */
+
static void dgnc_set_custom_speed(struct channel_t *ch, uint newrate)
{
int testdiv;
}
}
+static void dgnc_set_signal_low(struct channel_t *ch, const unsigned char sig)
+{
+ ch->ch_mostat &= ~(sig);
+ ch->ch_bd->bd_ops->assert_modem_signals(ch);
+}
+
void dgnc_wakeup_writes(struct channel_t *ch)
{
int qlen = 0;
spin_lock_irqsave(&ch->ch_lock, flags);
- /*
- * If channel now has space, wake up anyone waiting on the condition.
- */
+ /* If channel now has space, wake up anyone waiting on the condition. */
+
qlen = ch->ch_w_head - ch->ch_w_tail;
if (qlen < 0)
qlen += WQUEUESIZE;
* If RTS Toggle mode is on, whenever
* the queue and UART is empty, keep RTS low.
*/
- if (ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE) {
- ch->ch_mostat &= ~(UART_MCR_RTS);
- ch->ch_bd->bd_ops->assert_modem_signals(ch);
- }
+ if (ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE)
+ dgnc_set_signal_low(ch, UART_MCR_RTS);
/*
* If DTR Toggle mode is on, whenever
* the queue and UART is empty, keep DTR low.
*/
- if (ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE) {
- ch->ch_mostat &= ~(UART_MCR_DTR);
- ch->ch_bd->bd_ops->assert_modem_signals(ch);
- }
+ if (ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE)
+ dgnc_set_signal_low(ch, UART_MCR_DTR);
}
}
spin_unlock_irqrestore(&ch->ch_lock, flags);
}
-/************************************************************************
- *
- * TTY Entry points and helper functions
- *
- ************************************************************************/
+static struct dgnc_board *find_board_by_major(unsigned int major)
+{
+ int i;
+
+ for (i = 0; i < MAXBOARDS; i++) {
+ struct dgnc_board *brd = dgnc_board[i];
+
+ if (!brd)
+ return NULL;
+
+ if (major == brd->serial_driver->major ||
+ major == brd->print_driver->major)
+ return brd;
+ }
+
+ return NULL;
+}
+
+/* TTY Entry points and helper functions */
+
+/* dgnc_tty_open() */
-/*
- * dgnc_tty_open()
- *
- */
static int dgnc_tty_open(struct tty_struct *tty, struct file *file)
{
struct dgnc_board *brd;
return -ENXIO;
/* Get board pointer from our array of majors we have allocated */
- brd = dgnc_BoardsByMajor[major];
+ brd = find_board_by_major(major);
if (!brd)
return -ENXIO;
* ch_flags_wait to wake us back up.
*/
rc = wait_event_interruptible(ch->ch_flags_wait,
- (((ch->ch_tun.un_flags | ch->ch_pun.un_flags) &
- UN_CLOSING) == 0));
+ (((ch->ch_tun.un_flags |
+ ch->ch_pun.un_flags) & UN_CLOSING) == 0));
/* If ret is non-zero, user ctrl-c'ed us */
if (rc)
/* Store our unit into driver_data, so we always have it available. */
tty->driver_data = un;
- /*
- * Initialize tty's
- */
+ /* Initialize tty's */
+
if (!(un->un_flags & UN_ISOPEN)) {
/* Store important variables. */
un->un_tty = tty;
ch->ch_flags &= ~(CH_OPENING);
wake_up_interruptible(&ch->ch_flags_wait);
- /*
- * Initialize if neither terminal or printer is open.
- */
+ /* Initialize if neither terminal or printer is open. */
+
if (!((ch->ch_tun.un_flags | ch->ch_pun.un_flags) & UN_ISOPEN)) {
- /*
- * Flush input queues.
- */
+ /* Flush input queues. */
ch->ch_r_head = 0;
ch->ch_r_tail = 0;
ch->ch_e_head = 0;
brd->bd_ops->uart_init(ch);
}
- /*
- * Run param in case we changed anything
- */
+ /* Run param in case we changed anything */
+
brd->bd_ops->param(tty);
dgnc_carrier(ch);
- /*
- * follow protocol for opening port
- */
+ /* follow protocol for opening port */
spin_unlock_irqrestore(&ch->ch_lock, flags);
struct channel_t *ch)
{
int retval = 0;
- struct un_t *un = NULL;
+ struct un_t *un = tty->driver_data;
unsigned long flags;
uint old_flags = 0;
int sleep_on_un_flags = 0;
- if (!tty || tty->magic != TTY_MAGIC || !file || !ch ||
- ch->magic != DGNC_CHANNEL_MAGIC)
- return -ENXIO;
-
- un = tty->driver_data;
- if (!un || un->magic != DGNC_UNIT_MAGIC)
+ if (!file)
return -ENXIO;
spin_lock_irqsave(&ch->ch_lock, flags);
break;
}
- /*
- * Store the flags before we let go of channel lock
- */
+ /* Store the flags before we let go of channel lock */
+
if (sleep_on_un_flags)
old_flags = ch->ch_tun.un_flags | ch->ch_pun.un_flags;
else
* from the current value.
*/
if (sleep_on_un_flags)
- retval = wait_event_interruptible(un->un_flags_wait,
- (old_flags != (ch->ch_tun.un_flags |
- ch->ch_pun.un_flags)));
+ retval = wait_event_interruptible
+ (un->un_flags_wait,
+ (old_flags != (ch->ch_tun.un_flags |
+ ch->ch_pun.un_flags)));
else
retval = wait_event_interruptible(ch->ch_flags_wait,
- (old_flags != ch->ch_flags));
+ (old_flags != ch->ch_flags));
/*
* We got woken up for some reason.
*/
static void dgnc_tty_hangup(struct tty_struct *tty)
{
- struct un_t *un;
-
if (!tty || tty->magic != TTY_MAGIC)
return;
- un = tty->driver_data;
- if (!un || un->magic != DGNC_UNIT_MAGIC)
- return;
-
/* flush the transmit queues */
dgnc_tty_flush_buffer(tty);
}
-/*
- * dgnc_tty_close()
- *
- */
+/* dgnc_tty_close() */
+
static void dgnc_tty_close(struct tty_struct *tty, struct file *file)
{
struct dgnc_board *bd;
!(ch->ch_digi.digi_flags & DIGI_PRINTER)) {
ch->ch_flags &= ~(CH_STOPI | CH_FORCED_STOPI);
- /*
- * turn off print device when closing print device.
- */
+ /* turn off print device when closing print device. */
+
if ((un->un_type == DGNC_PRINT) && (ch->ch_flags & CH_PRON)) {
dgnc_wmove(ch, ch->ch_digi.digi_offstr,
(int)ch->ch_digi.digi_offlen);
tty->closing = 0;
- /*
- * If we have HUPCL set, lower DTR and RTS
- */
+ /* If we have HUPCL set, lower DTR and RTS */
+
if (ch->ch_c_cflag & HUPCL) {
/* Drop RTS/DTR */
ch->ch_mostat &= ~(UART_MCR_DTR | UART_MCR_RTS);
/* Turn off UART interrupts for this port */
ch->ch_bd->bd_ops->uart_off(ch);
} else {
- /*
- * turn off print device when closing print device.
- */
+ /* turn off print device when closing print device. */
+
if ((un->un_type == DGNC_PRINT) && (ch->ch_flags & CH_PRON)) {
dgnc_wmove(ch, ch->ch_digi.digi_offstr,
(int)ch->ch_digi.digi_offlen);
* returns the new bytes_available. This only affects printer
* output.
*/
-static int dgnc_maxcps_room(struct tty_struct *tty, int bytes_available)
+static int dgnc_maxcps_room(struct channel_t *ch, int bytes_available)
{
- struct un_t *un = tty->driver_data;
- struct channel_t *ch = un->un_ch;
-
- /*
- * If its not the Transparent print device, return
- * the full data amount.
- */
- if (un->un_type != DGNC_PRINT)
- return bytes_available;
-
if (ch->ch_digi.digi_maxcps > 0 && ch->ch_digi.digi_bufsize > 0) {
int cps_limit = 0;
unsigned long current_time = jiffies;
int ret = 0;
unsigned long flags;
- if (!tty || !dgnc_TmpWriteBuf)
+ if (!tty)
return 0;
un = tty->driver_data;
ret += WQUEUESIZE;
/* Limit printer to maxcps */
- ret = dgnc_maxcps_room(tty, ret);
+ if (un->un_type != DGNC_PRINT)
+ ret = dgnc_maxcps_room(ch, ret);
/*
* If we are printer device, leave space for
*/
static int dgnc_tty_put_char(struct tty_struct *tty, unsigned char c)
{
- /*
- * Simply call tty_write.
- */
+ /* Simply call tty_write. */
+
dgnc_tty_write(tty, &c, 1);
return 1;
}
ushort tmask;
uint remain;
- if (!tty || !dgnc_TmpWriteBuf)
+ if (!tty)
return 0;
un = tty->driver_data;
* Limit printer output to maxcps overall, with bursts allowed
* up to bufsize characters.
*/
- bufcount = dgnc_maxcps_room(tty, bufcount);
+ if (un->un_type != DGNC_PRINT)
+ bufcount = dgnc_maxcps_room(ch, bufcount);
/*
* Take minimum of what the user wants to send, and the
*/
count = min(count, bufcount);
- /*
- * Bail if no space left.
- */
+ /* Bail if no space left. */
+
if (count <= 0)
goto exit_retry;
}
if (n > 0) {
- /*
- * Move rest of data.
- */
+ /* Move rest of data. */
remain = n;
memcpy(ch->ch_wqueue + head, buf, remain);
head += remain;
return 0;
}
-/*
- * Return modem signals to ld.
- */
+/* Return modem signals to ld. */
static int dgnc_tty_tiocmget(struct tty_struct *tty)
{
dev_dbg(tty->dev, "dgnc_tty_send_xchar finish\n");
}
-/*
- * Return modem signals to ld.
- */
+/* Return modem signals to ld. */
+
static inline int dgnc_get_mstat(struct channel_t *ch)
{
unsigned char mstat;
- int result = -EIO;
+ int result = 0;
unsigned long flags;
if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
spin_unlock_irqrestore(&ch->ch_lock, flags);
- result = 0;
-
if (mstat & UART_MCR_DTR)
result |= TIOCM_DTR;
if (mstat & UART_MCR_RTS)
return result;
}
-/*
- * Return modem signals to ld.
- */
+/* Return modem signals to ld. */
+
static int dgnc_get_modem_info(struct channel_t *ch,
unsigned int __user *value)
{
*
* Set modem signals, called by ld.
*/
-static int dgnc_set_modem_info(struct tty_struct *tty,
+static int dgnc_set_modem_info(struct channel_t *ch,
unsigned int command,
unsigned int __user *value)
{
- struct dgnc_board *bd;
- struct channel_t *ch;
- struct un_t *un;
int ret = -ENXIO;
unsigned int arg = 0;
unsigned long flags;
- if (!tty || tty->magic != TTY_MAGIC)
- return ret;
-
- un = tty->driver_data;
- if (!un || un->magic != DGNC_UNIT_MAGIC)
- return ret;
-
- ch = un->un_ch;
- if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
- return ret;
-
- bd = ch->ch_bd;
- if (!bd || bd->magic != DGNC_BOARD_MAGIC)
- return ret;
-
ret = get_user(arg, value);
if (ret)
return ret;
* dgnc_tty_digigeta()
*
* Ioctl to get the information for ditty.
- *
- *
- *
*/
static int dgnc_tty_digigeta(struct tty_struct *tty,
struct digi_t __user *retinfo)
* dgnc_tty_digiseta()
*
* Ioctl to set the information for ditty.
- *
- *
- *
*/
static int dgnc_tty_digiseta(struct tty_struct *tty,
struct digi_t __user *new_info)
spin_lock_irqsave(&ch->ch_lock, flags);
- /*
- * Handle transistions to and from RTS Toggle.
- */
+ /* Handle transitions to and from RTS Toggle. */
+
if (!(ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE) &&
(new_digi.digi_flags & DIGI_RTS_TOGGLE))
ch->ch_mostat &= ~(UART_MCR_RTS);
!(new_digi.digi_flags & DIGI_RTS_TOGGLE))
ch->ch_mostat |= (UART_MCR_RTS);
- /*
- * Handle transistions to and from DTR Toggle.
- */
+ /* Handle transitions to and from DTR Toggle. */
+
if (!(ch->ch_digi.digi_flags & DIGI_DTR_TOGGLE) &&
(new_digi.digi_flags & DIGI_DTR_TOGGLE))
ch->ch_mostat &= ~(UART_MCR_DTR);
return 0;
}
-/*
- * dgnc_set_termios()
- */
+/* dgnc_set_termios() */
+
static void dgnc_tty_set_termios(struct tty_struct *tty,
struct ktermios *old_termios)
{
spin_unlock_irqrestore(&ch->ch_lock, flags);
}
-/*****************************************************************************
- *
- * The IOCTL function and all of its helpers
+/*
+ * dgnc_wake_up_unit()
*
- *****************************************************************************/
+ * Wakes up processes waiting in the unit's (teminal/printer) wait queue
+ */
+static void dgnc_wake_up_unit(struct un_t *unit)
+{
+ unit->un_flags &= ~(UN_LOW | UN_EMPTY);
+ wake_up_interruptible(&unit->un_flags_wait);
+}
+
+/* The IOCTL function and all of its helpers */
/*
* dgnc_tty_ioctl()
return 0;
case TCSBRKP:
- /* support for POSIX tcsendbreak()
+ /*
+ * support for POSIX tcsendbreak()
* According to POSIX.1 spec (7.2.2.1.2) breaks should be
* between 0.25 and 0.5 seconds so we'll ask for something
* in the middle: 0.375 seconds.
spin_unlock_irqrestore(&ch->ch_lock, flags);
- rc = put_user(C_CLOCAL(tty) ? 1 : 0,
- (unsigned long __user *)arg);
- return rc;
+ return put_user(C_CLOCAL(tty) ? 1 : 0,
+ (unsigned long __user *)arg);
case TIOCSSOFTCAR:
case TIOCMBIC:
case TIOCMSET:
spin_unlock_irqrestore(&ch->ch_lock, flags);
- return dgnc_set_modem_info(tty, cmd, uarg);
+ return dgnc_set_modem_info(ch, cmd, uarg);
- /*
- * Here are any additional ioctl's that we want to implement
- */
+ /* Here are any additional ioctl's that we want to implement */
case TCFLSH:
/*
ch->ch_w_head = ch->ch_w_tail;
ch_bd_ops->flush_uart_write(ch);
- if (ch->ch_tun.un_flags & (UN_LOW | UN_EMPTY)) {
- ch->ch_tun.un_flags &=
- ~(UN_LOW | UN_EMPTY);
- wake_up_interruptible(&ch->ch_tun.un_flags_wait);
- }
-
- if (ch->ch_pun.un_flags & (UN_LOW|UN_EMPTY)) {
- ch->ch_pun.un_flags &=
- ~(UN_LOW | UN_EMPTY);
- wake_up_interruptible(&ch->ch_pun.un_flags_wait);
- }
+ if (ch->ch_tun.un_flags & (UN_LOW | UN_EMPTY))
+ dgnc_wake_up_unit(&ch->ch_tun);
+
+ if (ch->ch_pun.un_flags & (UN_LOW | UN_EMPTY))
+ dgnc_wake_up_unit(&ch->ch_pun);
}
}
case DIGI_LOOPBACK:
{
uint loopback = 0;
- /* Let go of locks when accessing user space,
+ /*
+ * Let go of locks when accessing user space,
* could sleep
- */
+ */
spin_unlock_irqrestore(&ch->ch_lock, flags);
rc = get_user(loopback, (unsigned int __user *)arg);
if (rc)
case DIGI_GETCUSTOMBAUD:
spin_unlock_irqrestore(&ch->ch_lock, flags);
- rc = put_user(ch->ch_custom_speed, (unsigned int __user *)arg);
- return rc;
+ return put_user(ch->ch_custom_speed,
+ (unsigned int __user *)arg);
case DIGI_SETCUSTOMBAUD:
{
* This ioctl allows insertion of a character into the front
* of any pending data to be transmitted.
*
- * This ioctl is to satify the "Send Character Immediate"
+ * This ioctl is to satisfy the "Send Character Immediate"
* call that the RealPort protocol spec requires.
*/
case DIGI_REALPORT_SENDIMMEDIATE:
/*
* This ioctl returns all the current counts for the port.
*
- * This ioctl is to satify the "Line Error Counters"
+ * This ioctl is to satisfy the "Line Error Counters"
* call that the RealPort protocol spec requires.
*/
case DIGI_REALPORT_GETCOUNTERS:
/*
* This ioctl returns all current events.
*
- * This ioctl is to satify the "Event Reporting"
+ * This ioctl is to satisfy the "Event Reporting"
* call that the RealPort protocol spec requires.
*/
case DIGI_REALPORT_GETEVENTS:
events |= (EV_IPU | EV_IPS);
spin_unlock_irqrestore(&ch->ch_lock, flags);
- rc = put_user(events, (unsigned int __user *)arg);
- return rc;
+ return put_user(events, (unsigned int __user *)arg);
}
/*
spin_unlock_irqrestore(&ch->ch_lock, flags);
- /*
- * Get data from user first.
- */
+ /* Get data from user first. */
+
if (copy_from_user(&buf, uarg, sizeof(buf)))
return -EFAULT;
spin_lock_irqsave(&ch->ch_lock, flags);
- /*
- * Figure out how much data is in our RX and TX queues.
- */
+ /* Figure out how much data is in our RX and TX queues. */
+
buf.rxbuf = (ch->ch_r_head - ch->ch_r_tail) & RQUEUEMASK;
buf.txbuf = (ch->ch_w_head - ch->ch_w_tail) & WQUEUEMASK;
/*
- * Is the UART empty? Add that value to whats in our TX queue.
+ * Is the UART empty?
+ * Add that value to whats in our TX queue.
*/
+
count = buf.txbuf + ch_bd_ops->get_uart_bytes_left(ch);
/*
if (buf.txbuf > tdist)
buf.txbuf = tdist;
- /*
- * Report whether our queue and UART TX are completely empty.
- */
+ /* Report whether our queue and UART TX are completely empty. */
+
if (count)
buf.txdone = 0;
else
projects / karo-tx-linux.git / blobdiff