/*********************************************************************
*
* Filename: ircomm_tty.c
* Version: 1.0
* Description: IrCOMM serial TTY driver
* Status: Experimental.
* Author: Dag Brattli <[email protected]>
* Created at: Sun Jun 6 21:00:56 1999
* Modified at: Wed Feb 23 00:09:02 2000
* Modified by: Dag Brattli <[email protected]>
* Sources: serial.c and previous IrCOMM work by Takahide Higuchi
*
* Copyright (c) 1999-2000 Dag Brattli, All Rights Reserved.
* Copyright (c) 2000-2003 Jean Tourrilhes <[email protected]>
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*
********************************************************************/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/seq_file.h>
#include <linux/termios.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/interrupt.h>
#include <linux/device.h> /* for MODULE_ALIAS_CHARDEV_MAJOR */
#include <asm/uaccess.h>
#include <net/irda/irda.h>
#include <net/irda/irmod.h>
#include <net/irda/ircomm_core.h>
#include <net/irda/ircomm_param.h>
#include <net/irda/ircomm_tty_attach.h>
#include <net/irda/ircomm_tty.h>
static int ircomm_tty_install(struct tty_driver *driver,
struct tty_struct *tty);
static int ircomm_tty_open(struct tty_struct *tty, struct file *filp);
static void ircomm_tty_close(struct tty_struct * tty, struct file *filp);
static int ircomm_tty_write(struct tty_struct * tty,
const unsigned char *buf, int count);
static int ircomm_tty_write_room(struct tty_struct *tty);
static void ircomm_tty_throttle(struct tty_struct *tty);
static void ircomm_tty_unthrottle(struct tty_struct *tty);
static int ircomm_tty_chars_in_buffer(struct tty_struct *tty);
static void ircomm_tty_flush_buffer(struct tty_struct *tty);
static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch);
static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout);
static void ircomm_tty_hangup(struct tty_struct *tty);
static void ircomm_tty_do_softint(struct work_struct *work);
static void ircomm_tty_shutdown(struct ircomm_tty_cb *self);
static void ircomm_tty_stop(struct tty_struct *tty);
static int ircomm_tty_data_indication(void *instance, void *sap,
struct sk_buff *skb);
static int ircomm_tty_control_indication(void *instance, void *sap,
struct sk_buff *skb);
static void ircomm_tty_flow_indication(void *instance, void *sap,
LOCAL_FLOW cmd);
#ifdef CONFIG_PROC_FS
static const struct file_operations ircomm_tty_proc_fops;
#endif /* CONFIG_PROC_FS */
static struct tty_driver *driver;
static hashbin_t *ircomm_tty = NULL;
static const struct tty_operations ops = {
.install = ircomm_tty_install,
.open = ircomm_tty_open,
.close = ircomm_tty_close,
.write = ircomm_tty_write,
.write_room = ircomm_tty_write_room,
.chars_in_buffer = ircomm_tty_chars_in_buffer,
.flush_buffer = ircomm_tty_flush_buffer,
.ioctl = ircomm_tty_ioctl, /* ircomm_tty_ioctl.c */
.tiocmget = ircomm_tty_tiocmget, /* ircomm_tty_ioctl.c */
.tiocmset = ircomm_tty_tiocmset, /* ircomm_tty_ioctl.c */
.throttle = ircomm_tty_throttle,
.unthrottle = ircomm_tty_unthrottle,
.send_xchar = ircomm_tty_send_xchar,
.set_termios = ircomm_tty_set_termios,
.stop = ircomm_tty_stop,
.start = ircomm_tty_start,
.hangup = ircomm_tty_hangup,
.wait_until_sent = ircomm_tty_wait_until_sent,
#ifdef CONFIG_PROC_FS
.proc_fops = &ircomm_tty_proc_fops,
#endif /* CONFIG_PROC_FS */
};
static void ircomm_port_raise_dtr_rts(struct tty_port *port, int raise)
{
struct ircomm_tty_cb *self = container_of(port, struct ircomm_tty_cb,
port);
/*
* Here, we use to lock those two guys, but as ircomm_param_request()
* does it itself, I don't see the point (and I see the deadlock).
* Jean II
*/
if (raise)
self->settings.dte |= IRCOMM_RTS | IRCOMM_DTR;
else
self->settings.dte &= ~(IRCOMM_RTS | IRCOMM_DTR);
ircomm_param_request(self, IRCOMM_DTE, TRUE);
}
static int ircomm_port_carrier_raised(struct tty_port *port)
{
struct ircomm_tty_cb *self = container_of(port, struct ircomm_tty_cb,
port);
return self->settings.dce & IRCOMM_CD;
}
static const struct tty_port_operations ircomm_port_ops = {
.dtr_rts = ircomm_port_raise_dtr_rts,
.carrier_raised = ircomm_port_carrier_raised,
};
/*
* Function ircomm_tty_init()
*
* Init IrCOMM TTY layer/driver
*
*/
static int __init ircomm_tty_init(void)
{
driver = alloc_tty_driver(IRCOMM_TTY_PORTS);
if (!driver)
return -ENOMEM;
ircomm_tty = hashbin_new(HB_LOCK);
if (ircomm_tty == NULL) {
net_err_ratelimited("%s(), can't allocate hashbin!\n",
__func__);
put_tty_driver(driver);
return -ENOMEM;
}
driver->driver_name = "ircomm";
driver->name = "ircomm";
driver->major = IRCOMM_TTY_MAJOR;
driver->minor_start = IRCOMM_TTY_MINOR;
driver->type = TTY_DRIVER_TYPE_SERIAL;
driver->subtype = SERIAL_TYPE_NORMAL;
driver->init_termios = tty_std_termios;
driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
driver->flags = TTY_DRIVER_REAL_RAW;
tty_set_operations(driver, &ops);
if (tty_register_driver(driver)) {
net_err_ratelimited("%s(): Couldn't register serial driver\n",
__func__);
put_tty_driver(driver);
return -1;
}
return 0;
}
static void __exit __ircomm_tty_cleanup(struct ircomm_tty_cb *self)
{
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
ircomm_tty_shutdown(self);
self->magic = 0;
tty_port_destroy(&self->port);
kfree(self);
}
/*
* Function ircomm_tty_cleanup ()
*
* Remove IrCOMM TTY layer/driver
*
*/
static void __exit ircomm_tty_cleanup(void)
{
int ret;
ret = tty_unregister_driver(driver);
if (ret) {
net_err_ratelimited("%s(), failed to unregister driver\n",
__func__);
return;
}
hashbin_delete(ircomm_tty, (FREE_FUNC) __ircomm_tty_cleanup);
put_tty_driver(driver);
}
/*
* Function ircomm_startup (self)
*
*
*
*/
static int ircomm_tty_startup(struct ircomm_tty_cb *self)
{
notify_t notify;
int ret = -ENODEV;
IRDA_ASSERT(self != NULL, return -1;);
IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
/* Check if already open */
if (test_and_set_bit(ASYNCB_INITIALIZED, &self->port.flags)) {
pr_debug("%s(), already open so break out!\n", __func__);
return 0;
}
/* Register with IrCOMM */
irda_notify_init(¬ify);
/* These callbacks we must handle ourselves */
notify.data_indication = ircomm_tty_data_indication;
notify.udata_indication = ircomm_tty_control_indication;
notify.flow_indication = ircomm_tty_flow_indication;
/* Use the ircomm_tty interface for these ones */
notify.disconnect_indication = ircomm_tty_disconnect_indication;
notify.connect_confirm = ircomm_tty_connect_confirm;
notify.connect_indication = ircomm_tty_connect_indication;
strlcpy(notify.name, "ircomm_tty", sizeof(notify.name));
notify.instance = self;
if (!self->ircomm) {
self->ircomm = ircomm_open(¬ify, self->service_type,
self->line);
}
if (!self->ircomm)
goto err;
self->slsap_sel = self->ircomm->slsap_