diff options
Diffstat (limited to 'net/irda/ircomm/ircomm_tty.c')
| -rw-r--r-- | net/irda/ircomm/ircomm_tty.c | 1329 |
1 files changed, 0 insertions, 1329 deletions
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(¬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_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); |