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linux/drivers/isdn/gigaset/interface.c
Greg Kroah-Hartman 331b831983 [PATCH] devfs: Rename TTY_DRIVER_NO_DEVFS to TTY_DRIVER_DYNAMIC_DEV 
I've always found this flag confusing.  Now that devfs is no longer around, it
has been renamed, and the documentation for when this flag should be used has
been updated.

Also fixes all drivers that use this flag.

Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2006-06-26 12:25:09 -07:00

732 lines
17 KiB
C
Raw Blame History

/*
* interface to user space for the gigaset driver
*
* Copyright (c) 2004 by Hansjoerg Lipp <hjlipp@web.de>
*
* =====================================================================
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
* =====================================================================
*/
#include "gigaset.h"
#include <linux/gigaset_dev.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
/*** our ioctls ***/
static int if_lock(struct cardstate *cs, int *arg)
{
int cmd = *arg;
gig_dbg(DEBUG_IF, "%u: if_lock (%d)", cs->minor_index, cmd);
if (cmd > 1)
return -EINVAL;
if (cmd < 0) {
*arg = atomic_read(&cs->mstate) == MS_LOCKED; //FIXME remove?
return 0;
}
if (!cmd && atomic_read(&cs->mstate) == MS_LOCKED
&& cs->connected) {
cs->ops->set_modem_ctrl(cs, 0, TIOCM_DTR|TIOCM_RTS);
cs->ops->baud_rate(cs, B115200);
cs->ops->set_line_ctrl(cs, CS8);
cs->control_state = TIOCM_DTR|TIOCM_RTS;
}
cs->waiting = 1;
if (!gigaset_add_event(cs, &cs->at_state, EV_IF_LOCK,
NULL, cmd, NULL)) {
cs->waiting = 0;
return -ENOMEM;
}
gig_dbg(DEBUG_CMD, "scheduling IF_LOCK");
gigaset_schedule_event(cs);
wait_event(cs->waitqueue, !cs->waiting);
if (cs->cmd_result >= 0) {
*arg = cs->cmd_result;
return 0;
}
return cs->cmd_result;
}
static int if_version(struct cardstate *cs, unsigned arg[4])
{
static const unsigned version[4] = GIG_VERSION;
static const unsigned compat[4] = GIG_COMPAT;
unsigned cmd = arg[0];
gig_dbg(DEBUG_IF, "%u: if_version (%d)", cs->minor_index, cmd);
switch (cmd) {
case GIGVER_DRIVER:
memcpy(arg, version, sizeof version);
return 0;
case GIGVER_COMPAT:
memcpy(arg, compat, sizeof compat);
return 0;
case GIGVER_FWBASE:
cs->waiting = 1;
if (!gigaset_add_event(cs, &cs->at_state, EV_IF_VER,
NULL, 0, arg)) {
cs->waiting = 0;
return -ENOMEM;
}
gig_dbg(DEBUG_CMD, "scheduling IF_VER");
gigaset_schedule_event(cs);
wait_event(cs->waitqueue, !cs->waiting);
if (cs->cmd_result >= 0)
return 0;
return cs->cmd_result;
default:
return -EINVAL;
}
}
static int if_config(struct cardstate *cs, int *arg)
{
gig_dbg(DEBUG_IF, "%u: if_config (%d)", cs->minor_index, *arg);
if (*arg != 1)
return -EINVAL;
if (atomic_read(&cs->mstate) != MS_LOCKED)
return -EBUSY;
if (!cs->connected) {
err("not connected!");
return -ENODEV;
}
*arg = 0;
return gigaset_enterconfigmode(cs);
}
/*** the terminal driver ***/
/* stolen from usbserial and some other tty drivers */
static int if_open(struct tty_struct *tty, struct file *filp);
static void if_close(struct tty_struct *tty, struct file *filp);
static int if_ioctl(struct tty_struct *tty, struct file *file,
unsigned int cmd, unsigned long arg);
static int if_write_room(struct tty_struct *tty);
static int if_chars_in_buffer(struct tty_struct *tty);
static void if_throttle(struct tty_struct *tty);
static void if_unthrottle(struct tty_struct *tty);
static void if_set_termios(struct tty_struct *tty, struct termios *old);
static int if_tiocmget(struct tty_struct *tty, struct file *file);
static int if_tiocmset(struct tty_struct *tty, struct file *file,
unsigned int set, unsigned int clear);
static int if_write(struct tty_struct *tty,
const unsigned char *buf, int count);
static struct tty_operations if_ops = {
.open = if_open,
.close = if_close,
.ioctl = if_ioctl,
.write = if_write,
.write_room = if_write_room,
.chars_in_buffer = if_chars_in_buffer,
.set_termios = if_set_termios,
.throttle = if_throttle,
.unthrottle = if_unthrottle,
#if 0
.break_ctl = serial_break,
#endif
.tiocmget = if_tiocmget,
.tiocmset = if_tiocmset,
};
static int if_open(struct tty_struct *tty, struct file *filp)
{
struct cardstate *cs;
unsigned long flags;
gig_dbg(DEBUG_IF, "%d+%d: %s()",
tty->driver->minor_start, tty->index, __func__);
tty->driver_data = NULL;
cs = gigaset_get_cs_by_tty(tty);
if (!cs)
return -ENODEV;
if (mutex_lock_interruptible(&cs->mutex))
return -ERESTARTSYS; // FIXME -EINTR?
tty->driver_data = cs;
++cs->open_count;
if (cs->open_count == 1) {
spin_lock_irqsave(&cs->lock, flags);
cs->tty = tty;
spin_unlock_irqrestore(&cs->lock, flags);
tty->low_latency = 1; //FIXME test
}
mutex_unlock(&cs->mutex);
return 0;
}
static void if_close(struct tty_struct *tty, struct file *filp)
{
struct cardstate *cs;
unsigned long flags;
cs = (struct cardstate *) tty->driver_data;
if (!cs) {
err("cs==NULL in %s", __func__);
return;
}
gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
mutex_lock(&cs->mutex);
if (!cs->open_count)
warn("%s: device not opened", __func__);
else {
if (!--cs->open_count) {
spin_lock_irqsave(&cs->lock, flags);
cs->tty = NULL;
spin_unlock_irqrestore(&cs->lock, flags);
}
}
mutex_unlock(&cs->mutex);
}
static int if_ioctl(struct tty_struct *tty, struct file *file,
unsigned int cmd, unsigned long arg)
{
struct cardstate *cs;
int retval = -ENODEV;
int int_arg;
unsigned char buf[6];
unsigned version[4];
cs = (struct cardstate *) tty->driver_data;
if (!cs) {
err("cs==NULL in %s", __func__);
return -ENODEV;
}
gig_dbg(DEBUG_IF, "%u: %s(0x%x)", cs->minor_index, __func__, cmd);
if (mutex_lock_interruptible(&cs->mutex))
return -ERESTARTSYS; // FIXME -EINTR?
if (!cs->open_count)
warn("%s: device not opened", __func__);
else {
retval = 0;
switch (cmd) {
case GIGASET_REDIR:
retval = get_user(int_arg, (int __user *) arg);
if (retval >= 0)
retval = if_lock(cs, &int_arg);
if (retval >= 0)
retval = put_user(int_arg, (int __user *) arg);
break;
case GIGASET_CONFIG:
retval = get_user(int_arg, (int __user *) arg);
if (retval >= 0)
retval = if_config(cs, &int_arg);
if (retval >= 0)
retval = put_user(int_arg, (int __user *) arg);
break;
case GIGASET_BRKCHARS:
//FIXME test if MS_LOCKED
if (!cs->connected) {
gig_dbg(DEBUG_ANY,
"can't communicate with unplugged device");
retval = -ENODEV;
break;
}
retval = copy_from_user(&buf,
(const unsigned char __user *) arg, 6)
? -EFAULT : 0;
if (retval >= 0) {
gigaset_dbg_buffer(DEBUG_IF, "GIGASET_BRKCHARS",
6, (const unsigned char *) arg);
retval = cs->ops->brkchars(cs, buf);
}
break;
case GIGASET_VERSION:
retval = copy_from_user(version,
(unsigned __user *) arg, sizeof version)
? -EFAULT : 0;
if (retval >= 0)
retval = if_version(cs, version);
if (retval >= 0)
retval = copy_to_user((unsigned __user *) arg,
version, sizeof version)
? -EFAULT : 0;
break;
default:
gig_dbg(DEBUG_ANY, "%s: arg not supported - 0x%04x",
__func__, cmd);
retval = -ENOIOCTLCMD;
}
}
mutex_unlock(&cs->mutex);
return retval;
}
static int if_tiocmget(struct tty_struct *tty, struct file *file)
{
struct cardstate *cs;
int retval;
cs = (struct cardstate *) tty->driver_data;
if (!cs) {
err("cs==NULL in %s", __func__);
return -ENODEV;
}
gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
if (mutex_lock_interruptible(&cs->mutex))
return -ERESTARTSYS; // FIXME -EINTR?
// FIXME read from device?
retval = cs->control_state & (TIOCM_RTS|TIOCM_DTR);
mutex_unlock(&cs->mutex);
return retval;
}
static int if_tiocmset(struct tty_struct *tty, struct file *file,
unsigned int set, unsigned int clear)
{
struct cardstate *cs;
int retval;
unsigned mc;
cs = (struct cardstate *) tty->driver_data;
if (!cs) {
err("cs==NULL in %s", __func__);
return -ENODEV;
}
gig_dbg(DEBUG_IF, "%u: %s(0x%x, 0x%x)",
cs->minor_index, __func__, set, clear);
if (mutex_lock_interruptible(&cs->mutex))
return -ERESTARTSYS; // FIXME -EINTR?
if (!cs->connected) {
gig_dbg(DEBUG_ANY, "can't communicate with unplugged device");
retval = -ENODEV;
} else {
mc = (cs->control_state | set) & ~clear & (TIOCM_RTS|TIOCM_DTR);
retval = cs->ops->set_modem_ctrl(cs, cs->control_state, mc);
cs->control_state = mc;
}
mutex_unlock(&cs->mutex);
return retval;
}
static int if_write(struct tty_struct *tty, const unsigned char *buf, int count)
{
struct cardstate *cs;
int retval = -ENODEV;
cs = (struct cardstate *) tty->driver_data;
if (!cs) {
err("cs==NULL in %s", __func__);
return -ENODEV;
}
gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
if (mutex_lock_interruptible(&cs->mutex))
return -ERESTARTSYS; // FIXME -EINTR?
if (!cs->open_count)
warn("%s: device not opened", __func__);
else if (atomic_read(&cs->mstate) != MS_LOCKED) {
warn("can't write to unlocked device");
retval = -EBUSY;
} else if (!cs->connected) {
gig_dbg(DEBUG_ANY, "can't write to unplugged device");
retval = -EBUSY; //FIXME
} else {
retval = cs->ops->write_cmd(cs, buf, count,
&cs->if_wake_tasklet);
}
mutex_unlock(&cs->mutex);
return retval;
}
static int if_write_room(struct tty_struct *tty)
{
struct cardstate *cs;
int retval = -ENODEV;
cs = (struct cardstate *) tty->driver_data;
if (!cs) {
err("cs==NULL in %s", __func__);
return -ENODEV;
}
gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
if (mutex_lock_interruptible(&cs->mutex))
return -ERESTARTSYS; // FIXME -EINTR?
if (!cs->open_count)
warn("%s: device not opened", __func__);
else if (atomic_read(&cs->mstate) != MS_LOCKED) {
warn("can't write to unlocked device");
retval = -EBUSY; //FIXME
} else if (!cs->connected) {
gig_dbg(DEBUG_ANY, "can't write to unplugged device");
retval = -EBUSY; //FIXME
} else
retval = cs->ops->write_room(cs);
mutex_unlock(&cs->mutex);
return retval;
}
static int if_chars_in_buffer(struct tty_struct *tty)
{
struct cardstate *cs;
int retval = -ENODEV;
cs = (struct cardstate *) tty->driver_data;
if (!cs) {
err("cs==NULL in %s", __func__);
return -ENODEV;
}
gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
if (mutex_lock_interruptible(&cs->mutex))
return -ERESTARTSYS; // FIXME -EINTR?
if (!cs->open_count)
warn("%s: device not opened", __func__);
else if (atomic_read(&cs->mstate) != MS_LOCKED) {
warn("can't write to unlocked device");
retval = -EBUSY;
} else if (!cs->connected) {
gig_dbg(DEBUG_ANY, "can't write to unplugged device");
retval = -EBUSY; //FIXME
} else
retval = cs->ops->chars_in_buffer(cs);
mutex_unlock(&cs->mutex);
return retval;
}
static void if_throttle(struct tty_struct *tty)
{
struct cardstate *cs;
cs = (struct cardstate *) tty->driver_data;
if (!cs) {
err("cs==NULL in %s", __func__);
return;
}
gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
mutex_lock(&cs->mutex);
if (!cs->open_count)
warn("%s: device not opened", __func__);
else {
//FIXME
}
mutex_unlock(&cs->mutex);
}
static void if_unthrottle(struct tty_struct *tty)
{
struct cardstate *cs;
cs = (struct cardstate *) tty->driver_data;
if (!cs) {
err("cs==NULL in %s", __func__);
return;
}
gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
mutex_lock(&cs->mutex);
if (!cs->open_count)
warn("%s: device not opened", __func__);
else {
//FIXME
}
mutex_unlock(&cs->mutex);
}
static void if_set_termios(struct tty_struct *tty, struct termios *old)
{
struct cardstate *cs;
unsigned int iflag;
unsigned int cflag;
unsigned int old_cflag;
unsigned int control_state, new_state;
cs = (struct cardstate *) tty->driver_data;
if (!cs) {
err("cs==NULL in %s", __func__);
return;
}
gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
mutex_lock(&cs->mutex);
if (!cs->open_count) {
warn("%s: device not opened", __func__);
goto out;
}
if (!cs->connected) {
gig_dbg(DEBUG_ANY, "can't communicate with unplugged device");
goto out;
}
// stolen from mct_u232.c
iflag = tty->termios->c_iflag;
cflag = tty->termios->c_cflag;
old_cflag = old ? old->c_cflag : cflag; //FIXME?
gig_dbg(DEBUG_IF, "%u: iflag %x cflag %x old %x",
cs->minor_index, iflag, cflag, old_cflag);
/* get a local copy of the current port settings */
control_state = cs->control_state;
/*
* Update baud rate.
* Do not attempt to cache old rates and skip settings,
* disconnects screw such tricks up completely.
* Premature optimization is the root of all evil.
*/
/* reassert DTR and (maybe) RTS on transition from B0 */
if ((old_cflag & CBAUD) == B0) {
new_state = control_state | TIOCM_DTR;
/* don't set RTS if using hardware flow control */
if (!(old_cflag & CRTSCTS))
new_state |= TIOCM_RTS;
gig_dbg(DEBUG_IF, "%u: from B0 - set DTR%s",
cs->minor_index,
(new_state & TIOCM_RTS) ? " only" : "/RTS");
cs->ops->set_modem_ctrl(cs, control_state, new_state);
control_state = new_state;
}
cs->ops->baud_rate(cs, cflag & CBAUD);
if ((cflag & CBAUD) == B0) {
/* Drop RTS and DTR */
gig_dbg(DEBUG_IF, "%u: to B0 - drop DTR/RTS", cs->minor_index);
new_state = control_state & ~(TIOCM_DTR | TIOCM_RTS);
cs->ops->set_modem_ctrl(cs, control_state, new_state);
control_state = new_state;
}
/*
* Update line control register (LCR)
*/
cs->ops->set_line_ctrl(cs, cflag);
#if 0
//FIXME this hangs M101 [ts 2005-03-09]
//FIXME do we need this?
/*
* Set flow control: well, I do not really now how to handle DTR/RTS.
* Just do what we have seen with SniffUSB on Win98.
*/
/* Drop DTR/RTS if no flow control otherwise assert */
gig_dbg(DEBUG_IF, "%u: control_state %x",
cs->minor_index, control_state);
new_state = control_state;
if ((iflag & IXOFF) || (iflag & IXON) || (cflag & CRTSCTS))
new_state |= TIOCM_DTR | TIOCM_RTS;
else
new_state &= ~(TIOCM_DTR | TIOCM_RTS);
if (new_state != control_state) {
gig_dbg(DEBUG_IF, "%u: new_state %x",
cs->minor_index, new_state);
gigaset_set_modem_ctrl(cs, control_state, new_state);
control_state = new_state;
}
#endif
/* save off the modified port settings */
cs->control_state = control_state;
out:
mutex_unlock(&cs->mutex);
}
/* wakeup tasklet for the write operation */
static void if_wake(unsigned long data)
{
struct cardstate *cs = (struct cardstate *) data;
struct tty_struct *tty;
tty = cs->tty;
if (!tty)
return;
if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
tty->ldisc.write_wakeup) {
gig_dbg(DEBUG_IF, "write wakeup call");
tty->ldisc.write_wakeup(tty);
}
wake_up_interruptible(&tty->write_wait);
}
/*** interface to common ***/
void gigaset_if_init(struct cardstate *cs)
{
struct gigaset_driver *drv;
drv = cs->driver;
if (!drv->have_tty)
return;
tasklet_init(&cs->if_wake_tasklet, &if_wake, (unsigned long) cs);
cs->class = tty_register_device(drv->tty, cs->minor_index, NULL);
if (!IS_ERR(cs->class))
class_set_devdata(cs->class, cs);
else {
warn("could not register device to the tty subsystem");
cs->class = NULL;
}
}
void gigaset_if_free(struct cardstate *cs)
{
struct gigaset_driver *drv;
drv = cs->driver;
if (!drv->have_tty)
return;
tasklet_disable(&cs->if_wake_tasklet);
tasklet_kill(&cs->if_wake_tasklet);
cs->class = NULL;
tty_unregister_device(drv->tty, cs->minor_index);
}
void gigaset_if_receive(struct cardstate *cs,
unsigned char *buffer, size_t len)
{
unsigned long flags;
struct tty_struct *tty;
spin_lock_irqsave(&cs->lock, flags);
if ((tty = cs->tty) == NULL)
gig_dbg(DEBUG_ANY, "receive on closed device");
else {
tty_buffer_request_room(tty, len);
tty_insert_flip_string(tty, buffer, len);
tty_flip_buffer_push(tty);
}
spin_unlock_irqrestore(&cs->lock, flags);
}
EXPORT_SYMBOL_GPL(gigaset_if_receive);
/* gigaset_if_initdriver
* Initialize tty interface.
* parameters:
* drv Driver
* procname Name of the driver (e.g. for /proc/tty/drivers)
* devname Name of the device files (prefix without minor number)
*/
void gigaset_if_initdriver(struct gigaset_driver *drv, const char *procname,
const char *devname)
{
unsigned minors = drv->minors;
int ret;
struct tty_driver *tty;
drv->have_tty = 0;
if ((drv->tty = alloc_tty_driver(minors)) == NULL)
goto enomem;
tty = drv->tty;
tty->magic = TTY_DRIVER_MAGIC,
tty->major = GIG_MAJOR,
tty->type = TTY_DRIVER_TYPE_SERIAL,
tty->subtype = SERIAL_TYPE_NORMAL,
tty->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
tty->driver_name = procname;
tty->name = devname;
tty->minor_start = drv->minor;
tty->num = drv->minors;
tty->owner = THIS_MODULE;
tty->init_termios = tty_std_termios; //FIXME
tty->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; //FIXME
tty_set_operations(tty, &if_ops);
ret = tty_register_driver(tty);
if (ret < 0) {
warn("failed to register tty driver (error %d)", ret);
goto error;
}
gig_dbg(DEBUG_IF, "tty driver initialized");
drv->have_tty = 1;
return;
enomem:
warn("could not allocate tty structures");
error:
if (drv->tty)
put_tty_driver(drv->tty);
}
void gigaset_if_freedriver(struct gigaset_driver *drv)
{
if (!drv->have_tty)
return;
drv->have_tty = 0;
tty_unregister_driver(drv->tty);
put_tty_driver(drv->tty);
}
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