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-rw-r--r--net/irda/ircomm/ircomm_tty.c1329
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diff --git a/net/irda/ircomm/ircomm_tty.c b/net/irda/ircomm/ircomm_tty.c
deleted file mode 100644
index ec157c3419b5..000000000000
--- a/net/irda/ircomm/ircomm_tty.c
+++ /dev/null
@@ -1,1329 +0,0 @@
-/*********************************************************************
- *
- * Filename: ircomm_tty.c
- * Version: 1.0
- * Description: IrCOMM serial TTY driver
- * Status: Experimental.
- * Author: Dag Brattli <dagb@cs.uit.no>
- * Created at: Sun Jun 6 21:00:56 1999
- * Modified at: Wed Feb 23 00:09:02 2000
- * Modified by: Dag Brattli <dagb@cs.uit.no>
- * 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 <jt@hpl.hp.com>
- *
- * 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/signal.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 <linux/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 (tty_port_initialized(&self->port)) {
- pr_debug("%s(), already open so break out!\n", __func__);
- return 0;
- }
- tty_port_set_initialized(&self->port, 1);
-
- /* Register with IrCOMM */
- irda_notify_init(&notify);
- /* 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(&notify, self->service_type,
- self->line);
- }
- if (!self->ircomm)
- goto err;
-
- self->slsap_sel = self->ircomm->slsap_sel;
-
- /* Connect IrCOMM link with remote device */
- ret = ircomm_tty_attach_cable(self);
- if (ret < 0) {
- net_err_ratelimited("%s(), error attaching cable!\n", __func__);
- goto err;
- }
-
- return 0;
-err:
- tty_port_set_initialized(&self->port, 0);
- return ret;
-}
-
-/*
- * Function ircomm_block_til_ready (self, filp)
- *
- *
- *
- */
-static int ircomm_tty_block_til_ready(struct ircomm_tty_cb *self,
- struct tty_struct *tty, struct file *filp)
-{
- struct tty_port *port = &self->port;
- DECLARE_WAITQUEUE(wait, current);
- int retval;
- int do_clocal = 0;
- unsigned long flags;
-
- /*
- * If non-blocking mode is set, or the port is not enabled,
- * then make the check up front and then exit.
- */
- if (tty_io_error(tty)) {
- tty_port_set_active(port, 1);
- return 0;
- }
-
- if (filp->f_flags & O_NONBLOCK) {
- /* nonblock mode is set */
- if (C_BAUD(tty))
- tty_port_raise_dtr_rts(port);
- tty_port_set_active(port, 1);
- pr_debug("%s(), O_NONBLOCK requested!\n", __func__);
- return 0;
- }
-
- if (C_CLOCAL(tty)) {
- pr_debug("%s(), doing CLOCAL!\n", __func__);
- do_clocal = 1;
- }
-
- /* Wait for carrier detect and the line to become
- * free (i.e., not in use by the callout). While we are in
- * this loop, port->count is dropped by one, so that
- * mgsl_close() knows when to free things. We restore it upon
- * exit, either normal or abnormal.
- */
-
- retval = 0;
- add_wait_queue(&port->open_wait, &wait);
-
- pr_debug("%s(%d):block_til_ready before block on %s open_count=%d\n",
- __FILE__, __LINE__, tty->driver->name, port->count);
-
- spin_lock_irqsave(&port->lock, flags);
- port->count--;
- port->blocked_open++;
- spin_unlock_irqrestore(&port->lock, flags);
-
- while (1) {
- if (C_BAUD(tty) && tty_port_initialized(port))
- tty_port_raise_dtr_rts(port);
-
- set_current_state(TASK_INTERRUPTIBLE);
-
- if (tty_hung_up_p(filp) || !tty_port_initialized(port)) {
- retval = (port->flags & ASYNC_HUP_NOTIFY) ?
- -EAGAIN : -ERESTARTSYS;
- break;
- }
-
- /*
- * Check if link is ready now. Even if CLOCAL is
- * specified, we cannot return before the IrCOMM link is
- * ready
- */
- if ((do_clocal || tty_port_carrier_raised(port)) &&
- self->state == IRCOMM_TTY_READY)
- {
- break;
- }
-
- if (signal_pending(current)) {
- retval = -ERESTARTSYS;
- break;
- }
-
- pr_debug("%s(%d):block_til_ready blocking on %s open_count=%d\n",
- __FILE__, __LINE__, tty->driver->name, port->count);
-
- schedule();
- }
-
- __set_current_state(TASK_RUNNING);
- remove_wait_queue(&port->open_wait, &wait);
-
- spin_lock_irqsave(&port->lock, flags);
- if (!tty_hung_up_p(filp))
- port->count++;
- port->blocked_open--;
- spin_unlock_irqrestore(&port->lock, flags);
-
- pr_debug("%s(%d):block_til_ready after blocking on %s open_count=%d\n",
- __FILE__, __LINE__, tty->driver->name, port->count);
-
- if (!retval)
- tty_port_set_active(port, 1);
-
- return retval;
-}
-
-
-static int ircomm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
-{
- struct ircomm_tty_cb *self;
- unsigned int line = tty->index;
-
- /* Check if instance already exists */
- self = hashbin_lock_find(ircomm_tty, line, NULL);
- if (!self) {
- /* No, so make new instance */
- self = kzalloc(sizeof(struct ircomm_tty_cb), GFP_KERNEL);
- if (self == NULL)
- return -ENOMEM;
-
- tty_port_init(&self->port);
- self->port.ops = &ircomm_port_ops;
- self->magic = IRCOMM_TTY_MAGIC;
- self->flow = FLOW_STOP;
-
- self->line = line;
- INIT_WORK(&self->tqueue, ircomm_tty_do_softint);
- self->max_header_size = IRCOMM_TTY_HDR_UNINITIALISED;
- self->max_data_size = IRCOMM_TTY_DATA_UNINITIALISED;
-
- /* Init some important stuff */
- init_timer(&self->watchdog_timer);
- spin_lock_init(&self->spinlock);
-
- /*
- * Force TTY into raw mode by default which is usually what
- * we want for IrCOMM and IrLPT. This way applications will
- * not have to twiddle with printcap etc.
- *
- * Note this is completely usafe and doesn't work properly
- */
- tty->termios.c_iflag = 0;
- tty->termios.c_oflag = 0;
-
- /* Insert into hash */
- hashbin_insert(ircomm_tty, (irda_queue_t *) self, line, NULL);
- }
-
- tty->driver_data = self;
-
- return tty_port_install(&self->port, driver, tty);
-}
-
-/*
- * Function ircomm_tty_open (tty, filp)
- *
- * This routine is called when a particular tty device is opened. This
- * routine is mandatory; if this routine is not filled in, the attempted
- * open will fail with ENODEV.
- */
-static int ircomm_tty_open(struct tty_struct *tty, struct file *filp)
-{
- struct ircomm_tty_cb *self = tty->driver_data;
- unsigned long flags;
- int ret;
-
- /* ++ is not atomic, so this should be protected - Jean II */
- spin_lock_irqsave(&self->port.lock, flags);
- self->port.count++;
- spin_unlock_irqrestore(&self->port.lock, flags);
- tty_port_tty_set(&self->port, tty);
-
- pr_debug("%s(), %s%d, count = %d\n", __func__ , tty->driver->name,
- self->line, self->port.count);
-
- /* Not really used by us, but lets do it anyway */
- self->port.low_latency = (self->port.flags & ASYNC_LOW_LATENCY) ? 1 : 0;
-
- /* Check if this is a "normal" ircomm device, or an irlpt device */
- if (self->line < 0x10) {
- self->service_type = IRCOMM_3_WIRE | IRCOMM_9_WIRE;
- self->settings.service_type = IRCOMM_9_WIRE; /* 9 wire as default */
- /* Jan Kiszka -> add DSR/RI -> Conform to IrCOMM spec */
- self->settings.dce = IRCOMM_CTS | IRCOMM_CD | IRCOMM_DSR | IRCOMM_RI; /* Default line settings */
- pr_debug("%s(), IrCOMM device\n", __func__);
- } else {
- pr_debug("%s(), IrLPT device\n", __func__);
- self->service_type = IRCOMM_3_WIRE_RAW;
- self->settings.service_type = IRCOMM_3_WIRE_RAW; /* Default */
- }
-
- ret = ircomm_tty_startup(self);
- if (ret)
- return ret;
-
- ret = ircomm_tty_block_til_ready(self, tty, filp);
- if (ret) {
- pr_debug("%s(), returning after block_til_ready with %d\n",
- __func__, ret);
-
- return ret;
- }
- return 0;
-}
-
-/*
- * Function ircomm_tty_close (tty, filp)
- *
- * This routine is called when a particular tty device is closed.
- *
- */
-static void ircomm_tty_close(struct tty_struct *tty, struct file *filp)
-{
- struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
- struct tty_port *port = &self->port;
-
- IRDA_ASSERT(self != NULL, return;);
- IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
-
- if (tty_port_close_start(port, tty, filp) == 0)
- return;
-
- ircomm_tty_shutdown(self);
-
- tty_driver_flush_buffer(tty);
-
- tty_port_close_end(port, tty);
- tty_port_tty_set(port, NULL);
-}
-
-/*
- * Function ircomm_tty_flush_buffer (tty)
- *
- *
- *
- */
-static void ircomm_tty_flush_buffer(struct tty_struct *tty)
-{
- struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
-
- IRDA_ASSERT(self != NULL, return;);
- IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
-
- /*
- * Let do_softint() do this to avoid race condition with
- * do_softint() ;-)
- */
- schedule_work(&self->tqueue);
-}
-
-/*
- * Function ircomm_tty_do_softint (work)
- *
- * We use this routine to give the write wakeup to the user at at a
- * safe time (as fast as possible after write have completed). This
- * can be compared to the Tx interrupt.
- */
-static void ircomm_tty_do_softint(struct work_struct *work)
-{
- struct ircomm_tty_cb *self =
- container_of(work, struct ircomm_tty_cb, tqueue);
- struct tty_struct *tty;
- unsigned long flags;
- struct sk_buff *skb, *ctrl_skb;
-
- if (!self || self->magic != IRCOMM_TTY_MAGIC)
- return;
-
- tty = tty_port_tty_get(&self->port);
- if (!tty)
- return;
-
- /* Unlink control buffer */
- spin_lock_irqsave(&self->spinlock, flags);
-
- ctrl_skb = self->ctrl_skb;
- self->ctrl_skb = NULL;
-
- spin_unlock_irqrestore(&self->spinlock, flags);
-
- /* Flush control buffer if any */
- if(ctrl_skb) {
- if(self->flow == FLOW_START)
- ircomm_control_request(self->ircomm, ctrl_skb);
- /* Drop reference count - see ircomm_ttp_data_request(). */
- dev_kfree_skb(ctrl_skb);
- }
-
- if (tty->hw_stopped)
- goto put;
-
- /* Unlink transmit buffer */
- spin_lock_irqsave(&self->spinlock, flags);
-
- skb = self->tx_skb;
- self->tx_skb = NULL;
-
- spin_unlock_irqrestore(&self->spinlock, flags);
-
- /* Flush transmit buffer if any */
- if (skb) {
- ircomm_tty_do_event(self, IRCOMM_TTY_DATA_REQUEST, skb, NULL);
- /* Drop reference count - see ircomm_ttp_data_request(). */
- dev_kfree_skb(skb);
- }
-
- /* Check if user (still) wants to be waken up */
- tty_wakeup(tty);
-put:
- tty_kref_put(tty);
-}
-
-/*
- * Function ircomm_tty_write (tty, buf, count)
- *
- * This routine is called by the kernel to write a series of characters
- * to the tty device. The characters may come from user space or kernel
- * space. This routine will return the number of characters actually
- * accepted for writing. This routine is mandatory.
- */
-static int ircomm_tty_write(struct tty_struct *tty,
- const unsigned char *buf, int count)
-{
- struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
- unsigned long flags;
- struct sk_buff *skb;
- int tailroom = 0;
- int len = 0;
- int size;
-
- pr_debug("%s(), count=%d, hw_stopped=%d\n", __func__ , count,
- tty->hw_stopped);
-
- IRDA_ASSERT(self != NULL, return -1;);
- IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
-
- /* We may receive packets from the TTY even before we have finished
- * our setup. Not cool.
- * The problem is that we don't know the final header and data size
- * to create the proper skb, so any skb we would create would have
- * bogus header and data size, so need care.
- * We use a bogus header size to safely detect this condition.
- * Another problem is that hw_stopped was set to 0 way before it
- * should be, so we would drop this skb. It should now be fixed.
- * One option is to not accept data until we are properly setup.
- * But, I suspect that when it happens, the ppp line discipline
- * just "drops" the data, which might screw up connect scripts.
- * The second option is to create a "safe skb", with large header
- * and small size (see ircomm_tty_open() for values).
- * We just need to make sure that when the real values get filled,
- * we don't mess up the original "safe skb" (see tx_data_size).
- * Jean II */
- if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED) {
- pr_debug("%s() : not initialised\n", __func__);
-#ifdef IRCOMM_NO_TX_BEFORE_INIT
- /* We didn't consume anything, TTY will retry */
- return 0;
-#endif
- }
-
- if (count < 1)
- return 0;
-
- /* Protect our manipulation of self->tx_skb and related */
- spin_lock_irqsave(&self->spinlock, flags);
-
- /* Fetch current transmit buffer */
- skb = self->tx_skb;
-
- /*
- * Send out all the data we get, possibly as multiple fragmented
- * frames, but this will only happen if the data is larger than the
- * max data size. The normal case however is just the opposite, and
- * this function may be called multiple times, and will then actually
- * defragment the data and send it out as one packet as soon as
- * possible, but at a safer point in time
- */
- while (count) {
- size = count;
-
- /* Adjust data size to the max data size */
- if (size > self->max_data_size)
- size = self->max_data_size;
-
- /*
- * Do we already have a buffer ready for transmit, or do
- * we need to allocate a new frame
- */
- if (skb) {
- /*
- * Any room for more data at the end of the current
- * transmit buffer? Cannot use skb_tailroom, since
- * dev_alloc_skb gives us a larger skb than we
- * requested
- * Note : use tx_data_size, because max_data_size
- * may have changed and we don't want to overwrite
- * the skb. - Jean II
- */
- if ((tailroom = (self->tx_data_size - skb->len)) > 0) {
- /* Adjust data to tailroom */
- if (size > tailroom)
- size = tailroom;
- } else {
- /*
- * Current transmit frame is full, so break
- * out, so we can send it as soon as possible
- */
- break;
- }
- } else {
- /* Prepare a full sized frame */
- skb = alloc_skb(self->max_data_size+
- self->max_header_size,
- GFP_ATOMIC);
- if (!skb) {
- spin_unlock_irqrestore(&self->spinlock, flags);
- return -ENOBUFS;
- }
- skb_reserve(skb, self->max_header_size);
- self->tx_skb = skb;
- /* Remember skb size because max_data_size may
- * change later on - Jean II */
- self->tx_data_size = self->max_data_size;
- }
-
- /* Copy data */
- skb_put_data(skb, buf + len, size);
-
- count -= size;
- len += size;
- }
-
- spin_unlock_irqrestore(&self->spinlock, flags);
-
- /*
- * Schedule a new thread which will transmit the frame as soon
- * as possible, but at a safe point in time. We do this so the
- * "user" can give us data multiple times, as PPP does (because of
- * its 256 byte tx buffer). We will then defragment and send out
- * all this data as one single packet.
- */
- schedule_work(&self->tqueue);
-
- return len;
-}
-
-/*
- * Function ircomm_tty_write_room (tty)
- *
- * This routine returns the numbers of characters the tty driver will
- * accept for queuing to be written. This number is subject to change as
- * output buffers get emptied, or if the output flow control is acted.
- */
-static int ircomm_tty_write_room(struct tty_struct *tty)
-{
- struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
- unsigned long flags;
- int ret;
-
- IRDA_ASSERT(self != NULL, return -1;);
- IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
-
-#ifdef IRCOMM_NO_TX_BEFORE_INIT
- /* max_header_size tells us if the channel is initialised or not. */
- if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED)
- /* Don't bother us yet */
- return 0;
-#endif
-
- /* Check if we are allowed to transmit any data.
- * hw_stopped is the regular flow control.
- * Jean II */
- if (tty->hw_stopped)
- ret = 0;
- else {
- spin_lock_irqsave(&self->spinlock, flags);
- if (self->tx_skb)
- ret = self->tx_data_size - self->tx_skb->len;
- else
- ret = self->max_data_size;
- spin_unlock_irqrestore(&self->spinlock, flags);
- }
- pr_debug("%s(), ret=%d\n", __func__ , ret);
-
- return ret;
-}
-
-/*
- * Function ircomm_tty_wait_until_sent (tty, timeout)
- *
- * This routine waits until the device has written out all of the
- * characters in its transmitter FIFO.
- */
-static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout)
-{
- struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
- unsigned long orig_jiffies, poll_time;
- unsigned long flags;
-
- IRDA_ASSERT(self != NULL, return;);
- IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
-
- orig_jiffies = jiffies;
-
- /* Set poll time to 200 ms */
- poll_time = msecs_to_jiffies(200);
- if (timeout)
- poll_time = min_t(unsigned long, timeout, poll_time);
-
- spin_lock_irqsave(&self->spinlock, flags);
- while (self->tx_skb && self->tx_skb->len) {
- spin_unlock_irqrestore(&self->spinlock, flags);
- schedule_timeout_interruptible(poll_time);
- spin_lock_irqsave(&self->spinlock, flags);
- if (signal_pending(current))
- break;
- if (timeout && time_after(jiffies, orig_jiffies + timeout))
- break;
- }
- spin_unlock_irqrestore(&self->spinlock, flags);
- __set_current_state(TASK_RUNNING);
-}
-
-/*
- * Function ircomm_tty_throttle (tty)
- *
- * This routine notifies the tty driver that input buffers for the line
- * discipline are close to full, and it should somehow signal that no
- * more characters should be sent to the tty.
- */
-static void ircomm_tty_throttle(struct tty_struct *tty)
-{
- struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
-
- IRDA_ASSERT(self != NULL, return;);
- IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
-
- /* Software flow control? */
- if (I_IXOFF(tty))
- ircomm_tty_send_xchar(tty, STOP_CHAR(tty));
-
- /* Hardware flow control? */
- if (C_CRTSCTS(tty)) {
- self->settings.dte &= ~IRCOMM_RTS;
- self->settings.dte |= IRCOMM_DELTA_RTS;
-
- ircomm_param_request(self, IRCOMM_DTE, TRUE);
- }
-
- ircomm_flow_request(self->ircomm, FLOW_STOP);
-}
-
-/*
- * Function ircomm_tty_unthrottle (tty)
- *
- * This routine notifies the tty drivers that it should signals that
- * characters can now be sent to the tty without fear of overrunning the
- * input buffers of the line disciplines.
- */
-static void ircomm_tty_unthrottle(struct tty_struct *tty)
-{
- struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
-
- IRDA_ASSERT(self != NULL, return;);
- IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
-
- /* Using software flow control? */
- if (I_IXOFF(tty))
- ircomm_tty_send_xchar(tty, START_CHAR(tty));
-
- /* Using hardware flow control? */
- if (C_CRTSCTS(tty)) {
- self->settings.dte |= (IRCOMM_RTS|IRCOMM_DELTA_RTS);
-
- ircomm_param_request(self, IRCOMM_DTE, TRUE);
- pr_debug("%s(), FLOW_START\n", __func__);
- }
- ircomm_flow_request(self->ircomm, FLOW_START);
-}
-
-/*
- * Function ircomm_tty_chars_in_buffer (tty)
- *
- * Indicates if there are any data in the buffer
- *
- */
-static int ircomm_tty_chars_in_buffer(struct tty_struct *tty)
-{
- struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
- unsigned long flags;
- int len = 0;
-
- IRDA_ASSERT(self != NULL, return -1;);
- IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
-
- spin_lock_irqsave(&self->spinlock, flags);
-
- if (self->tx_skb)
- len = self->tx_skb->len;
-
- spin_unlock_irqrestore(&self->spinlock, flags);
-
- return len;
-}
-
-static void ircomm_tty_shutdown(struct ircomm_tty_cb *self)
-{
- unsigned long flags;
-
- IRDA_ASSERT(self != NULL, return;);
- IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
-
- if (!tty_port_initialized(&self->port))
- return;
- tty_port_set_initialized(&self->port, 0);
-
- ircomm_tty_detach_cable(self);
-
- spin_lock_irqsave(&self->spinlock, flags);
-
- del_timer(&self->watchdog_timer);
-
- /* Free parameter buffer */
- if (self->ctrl_skb) {
- dev_kfree_skb(self->ctrl_skb);
- self->ctrl_skb = NULL;
- }
-
- /* Free transmit buffer */
- if (self->tx_skb) {
- dev_kfree_skb(self->tx_skb);
- self->tx_skb = NULL;
- }
-
- if (self->ircomm) {
- ircomm_close(self->ircomm);
- self->ircomm = NULL;
- }
-
- spin_unlock_irqrestore(&self->spinlock, flags);
-}
-
-/*
- * Function ircomm_tty_hangup (tty)
- *
- * This routine notifies the tty driver that it should hangup the tty
- * device.
- *
- */
-static void ircomm_tty_hangup(struct tty_struct *tty)
-{
- struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
- struct tty_port *port = &self->port;
- unsigned long flags;
-
- IRDA_ASSERT(self != NULL, return;);
- IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
-
- /* ircomm_tty_flush_buffer(tty); */
- ircomm_tty_shutdown(self);
-
- spin_lock_irqsave(&port->lock, flags);
- if (port->tty) {
- set_bit(TTY_IO_ERROR, &port->tty->flags);
- tty_kref_put(port->tty);
- }
- port->tty = NULL;
- port->count = 0;
- spin_unlock_irqrestore(&port->lock, flags);
- tty_port_set_active(port, 0);
-
- wake_up_interruptible(&port->open_wait);
-}
-
-/*
- * Function ircomm_tty_send_xchar (tty, ch)
- *
- * This routine is used to send a high-priority XON/XOFF character to
- * the device.
- */
-static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch)
-{
- pr_debug("%s(), not impl\n", __func__);
-}
-
-/*
- * Function ircomm_tty_start (tty)
- *
- * This routine notifies the tty driver that it resume sending
- * characters to the tty device.
- */
-void ircomm_tty_start(struct tty_struct *tty)
-{
- struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
-
- ircomm_flow_request(self->ircomm, FLOW_START);
-}
-
-/*
- * Function ircomm_tty_stop (tty)
- *
- * This routine notifies the tty driver that it should stop outputting
- * characters to the tty device.
- */
-static void ircomm_tty_stop(struct tty_struct *tty)
-{
- struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data;
-
- IRDA_ASSERT(self != NULL, return;);
- IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
-
- ircomm_flow_request(self->ircomm, FLOW_STOP);
-}
-
-/*
- * Function ircomm_check_modem_status (self)
- *
- * Check for any changes in the DCE's line settings. This function should
- * be called whenever the dce parameter settings changes, to update the
- * flow control settings and other things
- */
-void ircomm_tty_check_modem_status(struct ircomm_tty_cb *self)
-{
- struct tty_struct *tty;
- int status;
-
- IRDA_ASSERT(self != NULL, return;);
- IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
-
- tty = tty_port_tty_get(&self->port);
-
- status = self->settings.dce;
-
- if (status & IRCOMM_DCE_DELTA_ANY) {
- /*wake_up_interruptible(&self->delta_msr_wait);*/
- }
- if (tty_port_check_carrier(&self->port) && (status & IRCOMM_DELTA_CD)) {
- pr_debug("%s(), ircomm%d CD now %s...\n", __func__ , self->line,
- (status & IRCOMM_CD) ? "on" : "off");
-
- if (status & IRCOMM_CD) {
- wake_up_interruptible(&self->port.open_wait);
- } else {
- pr_debug("%s(), Doing serial hangup..\n", __func__);
- if (tty)
- tty_hangup(tty);
-
- /* Hangup will remote the tty, so better break out */
- goto put;
- }
- }
- if (tty && tty_port_cts_enabled(&self->port)) {
- if (tty->hw_stopped) {
- if (status & IRCOMM_CTS) {
- pr_debug("%s(), CTS tx start...\n", __func__);
- tty->hw_stopped = 0;
-
- /* Wake up processes blocked on open */
- wake_up_interruptible(&self->port.open_wait);
-
- schedule_work(&self->tqueue);
- goto put;
- }
- } else {
- if (!(status & IRCOMM_CTS)) {
- pr_debug("%s(), CTS tx stop...\n", __func__);
- tty->hw_stopped = 1;
- }
- }
- }
-put:
- tty_kref_put(tty);
-}
-
-/*
- * Function ircomm_tty_data_indication (instance, sap, skb)
- *
- * Handle incoming data, and deliver it to the line discipline
- *
- */
-static int ircomm_tty_data_indication(void *instance, void *sap,
- struct sk_buff *skb)
-{
- struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
- struct tty_struct *tty;
-
- IRDA_ASSERT(self != NULL, return -1;);
- IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
- IRDA_ASSERT(skb != NULL, return -1;);
-
- tty = tty_port_tty_get(&self->port);
- if (!tty) {
- pr_debug("%s(), no tty!\n", __func__);
- return 0;
- }
-
- /*
- * If we receive data when hardware is stopped then something is wrong.
- * We try to poll the peers line settings to check if we are up todate.
- * Devices like WinCE can do this, and since they don't send any
- * params, we can just as well declare the hardware for running.
- */
- if (tty->hw_stopped && (self->flow == FLOW_START)) {
- pr_debug("%s(), polling for line settings!\n", __func__);
- ircomm_param_request(self, IRCOMM_POLL, TRUE);
-
- /* We can just as well declare the hardware for running */
- ircomm_tty_send_initial_parameters(self);
- ircomm_tty_link_established(self);
- }
- tty_kref_put(tty);
-
- /*
- * Use flip buffer functions since the code may be called from interrupt
- * context
- */
- tty_insert_flip_string(&self->port, skb->data, skb->len);
- tty_flip_buffer_push(&self->port);
-
- /* No need to kfree_skb - see ircomm_ttp_data_indication() */
-
- return 0;
-}
-
-/*
- * Function ircomm_tty_control_indication (instance, sap, skb)
- *
- * Parse all incoming parameters (easy!)
- *
- */
-static int ircomm_tty_control_indication(void *instance, void *sap,
- struct sk_buff *skb)
-{
- struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
- int clen;
-
- IRDA_ASSERT(self != NULL, return -1;);
- IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
- IRDA_ASSERT(skb != NULL, return -1;);
-
- clen = skb->data[0];
-
- irda_param_extract_all(self, skb->data+1, IRDA_MIN(skb->len-1, clen),
- &ircomm_param_info);
-
- /* No need to kfree_skb - see ircomm_control_indication() */
-
- return 0;
-}
-
-/*
- * Function ircomm_tty_flow_indication (instance, sap, cmd)
- *
- * This function is called by IrTTP when it wants us to slow down the
- * transmission of data. We just mark the hardware as stopped, and wait
- * for IrTTP to notify us that things are OK again.
- */
-static void ircomm_tty_flow_indication(void *instance, void *sap,
- LOCAL_FLOW cmd)
-{
- struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
- struct tty_struct *tty;
-
- IRDA_ASSERT(self != NULL, return;);
- IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
-
- tty = tty_port_tty_get(&self->port);
-
- switch (cmd) {
- case FLOW_START:
- pr_debug("%s(), hw start!\n", __func__);
- if (tty)
- tty->hw_stopped = 0;
-
- /* ircomm_tty_do_softint will take care of the rest */
- schedule_work(&self->tqueue);
- break;
- default: /* If we get here, something is very wrong, better stop */
- case FLOW_STOP:
- pr_debug("%s(), hw stopped!\n", __func__);
- if (tty)
- tty->hw_stopped = 1;
- break;
- }
-
- tty_kref_put(tty);
- self->flow = cmd;
-}
-
-#ifdef CONFIG_PROC_FS
-static void ircomm_tty_line_info(struct ircomm_tty_cb *self, struct seq_file *m)
-{
- struct tty_struct *tty;
- char sep;
-
- seq_printf(m, "State: %s\n", ircomm_tty_state[self->state]);
-
- seq_puts(m, "Service type: ");
- if (self->service_type & IRCOMM_9_WIRE)
- seq_puts(m, "9_WIRE");
- else if (self->service_type & IRCOMM_3_WIRE)
- seq_puts(m, "3_WIRE");
- else if (self->service_type & IRCOMM_3_WIRE_RAW)
- seq_puts(m, "3_WIRE_RAW");
- else
- seq_puts(m, "No common service type!\n");
- seq_putc(m, '\n');
-
- seq_printf(m, "Port name: %s\n", self->settings.port_name);
-
- seq_printf(m, "DTE status:");
- sep = ' ';
- if (self->settings.dte & IRCOMM_RTS) {
- seq_printf(m, "%cRTS", sep);
- sep = '|';
- }
- if (self->settings.dte & IRCOMM_DTR) {
- seq_printf(m, "%cDTR", sep);
- sep = '|';
- }
- seq_putc(m, '\n');
-
- seq_puts(m, "DCE status:");
- sep = ' ';
- if (self->settings.dce & IRCOMM_CTS) {
- seq_printf(m, "%cCTS", sep);
- sep = '|';
- }
- if (self->settings.dce & IRCOMM_DSR) {
- seq_printf(m, "%cDSR", sep);
- sep = '|';
- }
- if (self->settings.dce & IRCOMM_CD) {
- seq_printf(m, "%cCD", sep);
- sep = '|';
- }
- if (self->settings.dce & IRCOMM_RI) {
- seq_printf(m, "%cRI", sep);
- sep = '|';
- }
- seq_putc(m, '\n');
-
- seq_puts(m, "Configuration: ");
- if (!self->settings.null_modem)
- seq_puts(m, "DTE <-> DCE\n");
- else
- seq_puts(m, "DTE <-> DTE (null modem emulation)\n");
-
- seq_printf(m, "Data rate: %d\n", self->settings.data_rate);
-
- seq_puts(m, "Flow control:");
- sep = ' ';
- if (self->settings.flow_control & IRCOMM_XON_XOFF_IN) {
- seq_printf(m, "%cXON_XOFF_IN", sep);
- sep = '|';
- }
- if (self->settings.flow_control & IRCOMM_XON_XOFF_OUT) {
- seq_printf(m, "%cXON_XOFF_OUT", sep);
- sep = '|';
- }
- if (self->settings.flow_control & IRCOMM_RTS_CTS_IN) {
- seq_printf(m, "%cRTS_CTS_IN", sep);
- sep = '|';
- }
- if (self->settings.flow_control & IRCOMM_RTS_CTS_OUT) {
- seq_printf(m, "%cRTS_CTS_OUT", sep);
- sep = '|';
- }
- if (self->settings.flow_control & IRCOMM_DSR_DTR_IN) {
- seq_printf(m, "%cDSR_DTR_IN", sep);
- sep = '|';
- }
- if (self->settings.flow_control & IRCOMM_DSR_DTR_OUT) {
- seq_printf(m, "%cDSR_DTR_OUT", sep);
- sep = '|';
- }
- if (self->settings.flow_control & IRCOMM_ENQ_ACK_IN) {
- seq_printf(m, "%cENQ_ACK_IN", sep);
- sep = '|';
- }
- if (self->settings.flow_control & IRCOMM_ENQ_ACK_OUT) {
- seq_printf(m, "%cENQ_ACK_OUT", sep);
- sep = '|';
- }
- seq_putc(m, '\n');
-
- seq_puts(m, "Flags:");
- sep = ' ';
- if (tty_port_cts_enabled(&self->port)) {
- seq_printf(m, "%cASYNC_CTS_FLOW", sep);
- sep = '|';
- }
- if (tty_port_check_carrier(&self->port)) {
- seq_printf(m, "%cASYNC_CHECK_CD", sep);
- sep = '|';
- }
- if (tty_port_initialized(&self->port)) {
- seq_printf(m, "%cASYNC_INITIALIZED", sep);
- sep = '|';
- }
- if (self->port.flags & ASYNC_LOW_LATENCY) {
- seq_printf(m, "%cASYNC_LOW_LATENCY", sep);
- sep = '|';
- }
- if (tty_port_active(&self->port)) {
- seq_printf(m, "%cASYNC_NORMAL_ACTIVE", sep);
- sep = '|';
- }
- seq_putc(m, '\n');
-
- seq_printf(m, "Role: %s\n", self->client ? "client" : "server");
- seq_printf(m, "Open count: %d\n", self->port.count);
- seq_printf(m, "Max data size: %d\n", self->max_data_size);
- seq_printf(m, "Max header size: %d\n", self->max_header_size);
-
- tty = tty_port_tty_get(&self->port);
- if (tty) {
- seq_printf(m, "Hardware: %s\n",
- tty->hw_stopped ? "Stopped" : "Running");
- tty_kref_put(tty);
- }
-}
-
-static int ircomm_tty_proc_show(struct seq_file *m, void *v)
-{
- struct ircomm_tty_cb *self;
- unsigned long flags;
-
- spin_lock_irqsave(&ircomm_tty->hb_spinlock, flags);
-
- self = (struct ircomm_tty_cb *) hashbin_get_first(ircomm_tty);
- while (self != NULL) {
- if (self->magic != IRCOMM_TTY_MAGIC)
- break;
-
- ircomm_tty_line_info(self, m);
- self = (struct ircomm_tty_cb *) hashbin_get_next(ircomm_tty);
- }
- spin_unlock_irqrestore(&ircomm_tty->hb_spinlock, flags);
- return 0;
-}
-
-static int ircomm_tty_proc_open(struct inode *inode, struct file *file)
-{
- return single_open(file, ircomm_tty_proc_show, NULL);
-}
-
-static const struct file_operations ircomm_tty_proc_fops = {
- .owner = THIS_MODULE,
- .open = ircomm_tty_proc_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = single_release,
-};
-#endif /* CONFIG_PROC_FS */
-
-MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
-MODULE_DESCRIPTION("IrCOMM serial TTY driver");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS_CHARDEV_MAJOR(IRCOMM_TTY_MAJOR);
-
-module_init(ircomm_tty_init);
-module_exit(ircomm_tty_cleanup);