Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 1 | /********************************************************************* |
| 2 | * |
| 3 | * Filename: ircomm_tty.c |
| 4 | * Version: 1.0 |
| 5 | * Description: IrCOMM serial TTY driver |
| 6 | * Status: Experimental. |
| 7 | * Author: Dag Brattli <dagb@cs.uit.no> |
| 8 | * Created at: Sun Jun 6 21:00:56 1999 |
| 9 | * Modified at: Wed Feb 23 00:09:02 2000 |
| 10 | * Modified by: Dag Brattli <dagb@cs.uit.no> |
| 11 | * Sources: serial.c and previous IrCOMM work by Takahide Higuchi |
| 12 | * |
| 13 | * Copyright (c) 1999-2000 Dag Brattli, All Rights Reserved. |
| 14 | * Copyright (c) 2000-2003 Jean Tourrilhes <jt@hpl.hp.com> |
| 15 | * |
| 16 | * This program is free software; you can redistribute it and/or |
| 17 | * modify it under the terms of the GNU General Public License as |
| 18 | * published by the Free Software Foundation; either version 2 of |
| 19 | * the License, or (at your option) any later version. |
| 20 | * |
| 21 | * This program is distributed in the hope that it will be useful, |
| 22 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 23 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 24 | * GNU General Public License for more details. |
| 25 | * |
| 26 | * You should have received a copy of the GNU General Public License |
| 27 | * along with this program; if not, write to the Free Software |
| 28 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| 29 | * MA 02111-1307 USA |
| 30 | * |
| 31 | ********************************************************************/ |
| 32 | |
| 33 | #include <linux/config.h> |
| 34 | #include <linux/init.h> |
| 35 | #include <linux/module.h> |
| 36 | #include <linux/fs.h> |
| 37 | #include <linux/sched.h> |
| 38 | #include <linux/termios.h> |
| 39 | #include <linux/tty.h> |
| 40 | #include <linux/interrupt.h> |
| 41 | #include <linux/device.h> /* for MODULE_ALIAS_CHARDEV_MAJOR */ |
| 42 | |
| 43 | #include <asm/uaccess.h> |
| 44 | |
| 45 | #include <net/irda/irda.h> |
| 46 | #include <net/irda/irmod.h> |
| 47 | |
| 48 | #include <net/irda/ircomm_core.h> |
| 49 | #include <net/irda/ircomm_param.h> |
| 50 | #include <net/irda/ircomm_tty_attach.h> |
| 51 | #include <net/irda/ircomm_tty.h> |
| 52 | |
| 53 | static int ircomm_tty_open(struct tty_struct *tty, struct file *filp); |
| 54 | static void ircomm_tty_close(struct tty_struct * tty, struct file *filp); |
| 55 | static int ircomm_tty_write(struct tty_struct * tty, |
| 56 | const unsigned char *buf, int count); |
| 57 | static int ircomm_tty_write_room(struct tty_struct *tty); |
| 58 | static void ircomm_tty_throttle(struct tty_struct *tty); |
| 59 | static void ircomm_tty_unthrottle(struct tty_struct *tty); |
| 60 | static int ircomm_tty_chars_in_buffer(struct tty_struct *tty); |
| 61 | static void ircomm_tty_flush_buffer(struct tty_struct *tty); |
| 62 | static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch); |
| 63 | static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout); |
| 64 | static void ircomm_tty_hangup(struct tty_struct *tty); |
| 65 | static void ircomm_tty_do_softint(void *private_); |
| 66 | static void ircomm_tty_shutdown(struct ircomm_tty_cb *self); |
| 67 | static void ircomm_tty_stop(struct tty_struct *tty); |
| 68 | |
| 69 | static int ircomm_tty_data_indication(void *instance, void *sap, |
| 70 | struct sk_buff *skb); |
| 71 | static int ircomm_tty_control_indication(void *instance, void *sap, |
| 72 | struct sk_buff *skb); |
| 73 | static void ircomm_tty_flow_indication(void *instance, void *sap, |
| 74 | LOCAL_FLOW cmd); |
| 75 | #ifdef CONFIG_PROC_FS |
| 76 | static int ircomm_tty_read_proc(char *buf, char **start, off_t offset, int len, |
| 77 | int *eof, void *unused); |
| 78 | #endif /* CONFIG_PROC_FS */ |
| 79 | static struct tty_driver *driver; |
| 80 | |
| 81 | hashbin_t *ircomm_tty = NULL; |
| 82 | |
| 83 | static struct tty_operations ops = { |
| 84 | .open = ircomm_tty_open, |
| 85 | .close = ircomm_tty_close, |
| 86 | .write = ircomm_tty_write, |
| 87 | .write_room = ircomm_tty_write_room, |
| 88 | .chars_in_buffer = ircomm_tty_chars_in_buffer, |
| 89 | .flush_buffer = ircomm_tty_flush_buffer, |
| 90 | .ioctl = ircomm_tty_ioctl, /* ircomm_tty_ioctl.c */ |
| 91 | .tiocmget = ircomm_tty_tiocmget, /* ircomm_tty_ioctl.c */ |
| 92 | .tiocmset = ircomm_tty_tiocmset, /* ircomm_tty_ioctl.c */ |
| 93 | .throttle = ircomm_tty_throttle, |
| 94 | .unthrottle = ircomm_tty_unthrottle, |
| 95 | .send_xchar = ircomm_tty_send_xchar, |
| 96 | .set_termios = ircomm_tty_set_termios, |
| 97 | .stop = ircomm_tty_stop, |
| 98 | .start = ircomm_tty_start, |
| 99 | .hangup = ircomm_tty_hangup, |
| 100 | .wait_until_sent = ircomm_tty_wait_until_sent, |
| 101 | #ifdef CONFIG_PROC_FS |
| 102 | .read_proc = ircomm_tty_read_proc, |
| 103 | #endif /* CONFIG_PROC_FS */ |
| 104 | }; |
| 105 | |
| 106 | /* |
| 107 | * Function ircomm_tty_init() |
| 108 | * |
| 109 | * Init IrCOMM TTY layer/driver |
| 110 | * |
| 111 | */ |
| 112 | static int __init ircomm_tty_init(void) |
| 113 | { |
| 114 | driver = alloc_tty_driver(IRCOMM_TTY_PORTS); |
| 115 | if (!driver) |
| 116 | return -ENOMEM; |
| 117 | ircomm_tty = hashbin_new(HB_LOCK); |
| 118 | if (ircomm_tty == NULL) { |
| 119 | IRDA_ERROR("%s(), can't allocate hashbin!\n", __FUNCTION__); |
| 120 | put_tty_driver(driver); |
| 121 | return -ENOMEM; |
| 122 | } |
| 123 | |
| 124 | driver->owner = THIS_MODULE; |
| 125 | driver->driver_name = "ircomm"; |
| 126 | driver->name = "ircomm"; |
| 127 | driver->devfs_name = "ircomm"; |
| 128 | driver->major = IRCOMM_TTY_MAJOR; |
| 129 | driver->minor_start = IRCOMM_TTY_MINOR; |
| 130 | driver->type = TTY_DRIVER_TYPE_SERIAL; |
| 131 | driver->subtype = SERIAL_TYPE_NORMAL; |
| 132 | driver->init_termios = tty_std_termios; |
| 133 | driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; |
| 134 | driver->flags = TTY_DRIVER_REAL_RAW; |
| 135 | tty_set_operations(driver, &ops); |
| 136 | if (tty_register_driver(driver)) { |
| 137 | IRDA_ERROR("%s(): Couldn't register serial driver\n", |
| 138 | __FUNCTION__); |
| 139 | put_tty_driver(driver); |
| 140 | return -1; |
| 141 | } |
| 142 | return 0; |
| 143 | } |
| 144 | |
| 145 | static void __exit __ircomm_tty_cleanup(struct ircomm_tty_cb *self) |
| 146 | { |
| 147 | IRDA_DEBUG(0, "%s()\n", __FUNCTION__ ); |
| 148 | |
| 149 | IRDA_ASSERT(self != NULL, return;); |
| 150 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); |
| 151 | |
| 152 | ircomm_tty_shutdown(self); |
| 153 | |
| 154 | self->magic = 0; |
| 155 | kfree(self); |
| 156 | } |
| 157 | |
| 158 | /* |
| 159 | * Function ircomm_tty_cleanup () |
| 160 | * |
| 161 | * Remove IrCOMM TTY layer/driver |
| 162 | * |
| 163 | */ |
| 164 | static void __exit ircomm_tty_cleanup(void) |
| 165 | { |
| 166 | int ret; |
| 167 | |
| 168 | IRDA_DEBUG(4, "%s()\n", __FUNCTION__ ); |
| 169 | |
| 170 | ret = tty_unregister_driver(driver); |
| 171 | if (ret) { |
| 172 | IRDA_ERROR("%s(), failed to unregister driver\n", |
| 173 | __FUNCTION__); |
| 174 | return; |
| 175 | } |
| 176 | |
| 177 | hashbin_delete(ircomm_tty, (FREE_FUNC) __ircomm_tty_cleanup); |
| 178 | put_tty_driver(driver); |
| 179 | } |
| 180 | |
| 181 | /* |
| 182 | * Function ircomm_startup (self) |
| 183 | * |
| 184 | * |
| 185 | * |
| 186 | */ |
| 187 | static int ircomm_tty_startup(struct ircomm_tty_cb *self) |
| 188 | { |
| 189 | notify_t notify; |
| 190 | int ret = -ENODEV; |
| 191 | |
| 192 | IRDA_DEBUG(2, "%s()\n", __FUNCTION__ ); |
| 193 | |
| 194 | IRDA_ASSERT(self != NULL, return -1;); |
| 195 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); |
| 196 | |
| 197 | /* Check if already open */ |
| 198 | if (test_and_set_bit(ASYNC_B_INITIALIZED, &self->flags)) { |
| 199 | IRDA_DEBUG(2, "%s(), already open so break out!\n", __FUNCTION__ ); |
| 200 | return 0; |
| 201 | } |
| 202 | |
| 203 | /* Register with IrCOMM */ |
| 204 | irda_notify_init(¬ify); |
| 205 | /* These callbacks we must handle ourselves */ |
| 206 | notify.data_indication = ircomm_tty_data_indication; |
| 207 | notify.udata_indication = ircomm_tty_control_indication; |
| 208 | notify.flow_indication = ircomm_tty_flow_indication; |
| 209 | |
| 210 | /* Use the ircomm_tty interface for these ones */ |
| 211 | notify.disconnect_indication = ircomm_tty_disconnect_indication; |
| 212 | notify.connect_confirm = ircomm_tty_connect_confirm; |
| 213 | notify.connect_indication = ircomm_tty_connect_indication; |
| 214 | strlcpy(notify.name, "ircomm_tty", sizeof(notify.name)); |
| 215 | notify.instance = self; |
| 216 | |
| 217 | if (!self->ircomm) { |
| 218 | self->ircomm = ircomm_open(¬ify, self->service_type, |
| 219 | self->line); |
| 220 | } |
| 221 | if (!self->ircomm) |
| 222 | goto err; |
| 223 | |
| 224 | self->slsap_sel = self->ircomm->slsap_sel; |
| 225 | |
| 226 | /* Connect IrCOMM link with remote device */ |
| 227 | ret = ircomm_tty_attach_cable(self); |
| 228 | if (ret < 0) { |
| 229 | IRDA_ERROR("%s(), error attaching cable!\n", __FUNCTION__); |
| 230 | goto err; |
| 231 | } |
| 232 | |
| 233 | return 0; |
| 234 | err: |
| 235 | clear_bit(ASYNC_B_INITIALIZED, &self->flags); |
| 236 | return ret; |
| 237 | } |
| 238 | |
| 239 | /* |
| 240 | * Function ircomm_block_til_ready (self, filp) |
| 241 | * |
| 242 | * |
| 243 | * |
| 244 | */ |
| 245 | static int ircomm_tty_block_til_ready(struct ircomm_tty_cb *self, |
| 246 | struct file *filp) |
| 247 | { |
| 248 | DECLARE_WAITQUEUE(wait, current); |
| 249 | int retval; |
| 250 | int do_clocal = 0, extra_count = 0; |
| 251 | unsigned long flags; |
| 252 | struct tty_struct *tty; |
| 253 | |
| 254 | IRDA_DEBUG(2, "%s()\n", __FUNCTION__ ); |
| 255 | |
| 256 | tty = self->tty; |
| 257 | |
| 258 | /* |
| 259 | * If non-blocking mode is set, or the port is not enabled, |
| 260 | * then make the check up front and then exit. |
| 261 | */ |
| 262 | if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){ |
| 263 | /* nonblock mode is set or port is not enabled */ |
| 264 | self->flags |= ASYNC_NORMAL_ACTIVE; |
| 265 | IRDA_DEBUG(1, "%s(), O_NONBLOCK requested!\n", __FUNCTION__ ); |
| 266 | return 0; |
| 267 | } |
| 268 | |
| 269 | if (tty->termios->c_cflag & CLOCAL) { |
| 270 | IRDA_DEBUG(1, "%s(), doing CLOCAL!\n", __FUNCTION__ ); |
| 271 | do_clocal = 1; |
| 272 | } |
| 273 | |
| 274 | /* Wait for carrier detect and the line to become |
| 275 | * free (i.e., not in use by the callout). While we are in |
| 276 | * this loop, self->open_count is dropped by one, so that |
| 277 | * mgsl_close() knows when to free things. We restore it upon |
| 278 | * exit, either normal or abnormal. |
| 279 | */ |
| 280 | |
| 281 | retval = 0; |
| 282 | add_wait_queue(&self->open_wait, &wait); |
| 283 | |
| 284 | IRDA_DEBUG(2, "%s(%d):block_til_ready before block on %s open_count=%d\n", |
| 285 | __FILE__,__LINE__, tty->driver->name, self->open_count ); |
| 286 | |
| 287 | /* As far as I can see, we protect open_count - Jean II */ |
| 288 | spin_lock_irqsave(&self->spinlock, flags); |
| 289 | if (!tty_hung_up_p(filp)) { |
| 290 | extra_count = 1; |
| 291 | self->open_count--; |
| 292 | } |
| 293 | spin_unlock_irqrestore(&self->spinlock, flags); |
| 294 | self->blocked_open++; |
| 295 | |
| 296 | while (1) { |
| 297 | if (tty->termios->c_cflag & CBAUD) { |
| 298 | /* Here, we use to lock those two guys, but |
| 299 | * as ircomm_param_request() does it itself, |
| 300 | * I don't see the point (and I see the deadlock). |
| 301 | * Jean II */ |
| 302 | self->settings.dte |= IRCOMM_RTS + IRCOMM_DTR; |
| 303 | |
| 304 | ircomm_param_request(self, IRCOMM_DTE, TRUE); |
| 305 | } |
| 306 | |
| 307 | current->state = TASK_INTERRUPTIBLE; |
| 308 | |
| 309 | if (tty_hung_up_p(filp) || |
| 310 | !test_bit(ASYNC_B_INITIALIZED, &self->flags)) { |
| 311 | retval = (self->flags & ASYNC_HUP_NOTIFY) ? |
| 312 | -EAGAIN : -ERESTARTSYS; |
| 313 | break; |
| 314 | } |
| 315 | |
| 316 | /* |
| 317 | * Check if link is ready now. Even if CLOCAL is |
| 318 | * specified, we cannot return before the IrCOMM link is |
| 319 | * ready |
| 320 | */ |
| 321 | if (!test_bit(ASYNC_B_CLOSING, &self->flags) && |
| 322 | (do_clocal || (self->settings.dce & IRCOMM_CD)) && |
| 323 | self->state == IRCOMM_TTY_READY) |
| 324 | { |
| 325 | break; |
| 326 | } |
| 327 | |
| 328 | if (signal_pending(current)) { |
| 329 | retval = -ERESTARTSYS; |
| 330 | break; |
| 331 | } |
| 332 | |
| 333 | IRDA_DEBUG(1, "%s(%d):block_til_ready blocking on %s open_count=%d\n", |
| 334 | __FILE__,__LINE__, tty->driver->name, self->open_count ); |
| 335 | |
| 336 | schedule(); |
| 337 | } |
| 338 | |
| 339 | __set_current_state(TASK_RUNNING); |
| 340 | remove_wait_queue(&self->open_wait, &wait); |
| 341 | |
| 342 | if (extra_count) { |
| 343 | /* ++ is not atomic, so this should be protected - Jean II */ |
| 344 | spin_lock_irqsave(&self->spinlock, flags); |
| 345 | self->open_count++; |
| 346 | spin_unlock_irqrestore(&self->spinlock, flags); |
| 347 | } |
| 348 | self->blocked_open--; |
| 349 | |
| 350 | IRDA_DEBUG(1, "%s(%d):block_til_ready after blocking on %s open_count=%d\n", |
| 351 | __FILE__,__LINE__, tty->driver->name, self->open_count); |
| 352 | |
| 353 | if (!retval) |
| 354 | self->flags |= ASYNC_NORMAL_ACTIVE; |
| 355 | |
| 356 | return retval; |
| 357 | } |
| 358 | |
| 359 | /* |
| 360 | * Function ircomm_tty_open (tty, filp) |
| 361 | * |
| 362 | * This routine is called when a particular tty device is opened. This |
| 363 | * routine is mandatory; if this routine is not filled in, the attempted |
| 364 | * open will fail with ENODEV. |
| 365 | */ |
| 366 | static int ircomm_tty_open(struct tty_struct *tty, struct file *filp) |
| 367 | { |
| 368 | struct ircomm_tty_cb *self; |
| 369 | unsigned int line; |
| 370 | unsigned long flags; |
| 371 | int ret; |
| 372 | |
| 373 | IRDA_DEBUG(2, "%s()\n", __FUNCTION__ ); |
| 374 | |
| 375 | line = tty->index; |
| 376 | if ((line < 0) || (line >= IRCOMM_TTY_PORTS)) { |
| 377 | return -ENODEV; |
| 378 | } |
| 379 | |
| 380 | /* Check if instance already exists */ |
| 381 | self = hashbin_lock_find(ircomm_tty, line, NULL); |
| 382 | if (!self) { |
| 383 | /* No, so make new instance */ |
| 384 | self = kmalloc(sizeof(struct ircomm_tty_cb), GFP_KERNEL); |
| 385 | if (self == NULL) { |
| 386 | IRDA_ERROR("%s(), kmalloc failed!\n", __FUNCTION__); |
| 387 | return -ENOMEM; |
| 388 | } |
| 389 | memset(self, 0, sizeof(struct ircomm_tty_cb)); |
| 390 | |
| 391 | self->magic = IRCOMM_TTY_MAGIC; |
| 392 | self->flow = FLOW_STOP; |
| 393 | |
| 394 | self->line = line; |
| 395 | INIT_WORK(&self->tqueue, ircomm_tty_do_softint, self); |
| 396 | self->max_header_size = IRCOMM_TTY_HDR_UNINITIALISED; |
| 397 | self->max_data_size = IRCOMM_TTY_DATA_UNINITIALISED; |
| 398 | self->close_delay = 5*HZ/10; |
| 399 | self->closing_wait = 30*HZ; |
| 400 | |
| 401 | /* Init some important stuff */ |
| 402 | init_timer(&self->watchdog_timer); |
| 403 | init_waitqueue_head(&self->open_wait); |
| 404 | init_waitqueue_head(&self->close_wait); |
| 405 | spin_lock_init(&self->spinlock); |
| 406 | |
| 407 | /* |
| 408 | * Force TTY into raw mode by default which is usually what |
| 409 | * we want for IrCOMM and IrLPT. This way applications will |
| 410 | * not have to twiddle with printcap etc. |
| 411 | */ |
| 412 | tty->termios->c_iflag = 0; |
| 413 | tty->termios->c_oflag = 0; |
| 414 | |
| 415 | /* Insert into hash */ |
| 416 | hashbin_insert(ircomm_tty, (irda_queue_t *) self, line, NULL); |
| 417 | } |
| 418 | /* ++ is not atomic, so this should be protected - Jean II */ |
| 419 | spin_lock_irqsave(&self->spinlock, flags); |
| 420 | self->open_count++; |
| 421 | |
| 422 | tty->driver_data = self; |
| 423 | self->tty = tty; |
| 424 | spin_unlock_irqrestore(&self->spinlock, flags); |
| 425 | |
| 426 | IRDA_DEBUG(1, "%s(), %s%d, count = %d\n", __FUNCTION__ , tty->driver->name, |
| 427 | self->line, self->open_count); |
| 428 | |
| 429 | /* Not really used by us, but lets do it anyway */ |
| 430 | self->tty->low_latency = (self->flags & ASYNC_LOW_LATENCY) ? 1 : 0; |
| 431 | |
| 432 | /* |
| 433 | * If the port is the middle of closing, bail out now |
| 434 | */ |
| 435 | if (tty_hung_up_p(filp) || |
| 436 | test_bit(ASYNC_B_CLOSING, &self->flags)) { |
| 437 | |
| 438 | /* Hm, why are we blocking on ASYNC_CLOSING if we |
| 439 | * do return -EAGAIN/-ERESTARTSYS below anyway? |
| 440 | * IMHO it's either not needed in the first place |
| 441 | * or for some reason we need to make sure the async |
| 442 | * closing has been finished - if so, wouldn't we |
| 443 | * probably better sleep uninterruptible? |
| 444 | */ |
| 445 | |
| 446 | if (wait_event_interruptible(self->close_wait, !test_bit(ASYNC_B_CLOSING, &self->flags))) { |
| 447 | IRDA_WARNING("%s - got signal while blocking on ASYNC_CLOSING!\n", |
| 448 | __FUNCTION__); |
| 449 | return -ERESTARTSYS; |
| 450 | } |
| 451 | |
| 452 | #ifdef SERIAL_DO_RESTART |
| 453 | return ((self->flags & ASYNC_HUP_NOTIFY) ? |
| 454 | -EAGAIN : -ERESTARTSYS); |
| 455 | #else |
| 456 | return -EAGAIN; |
| 457 | #endif |
| 458 | } |
| 459 | |
| 460 | /* Check if this is a "normal" ircomm device, or an irlpt device */ |
| 461 | if (line < 0x10) { |
| 462 | self->service_type = IRCOMM_3_WIRE | IRCOMM_9_WIRE; |
| 463 | self->settings.service_type = IRCOMM_9_WIRE; /* 9 wire as default */ |
| 464 | /* Jan Kiszka -> add DSR/RI -> Conform to IrCOMM spec */ |
| 465 | self->settings.dce = IRCOMM_CTS | IRCOMM_CD | IRCOMM_DSR | IRCOMM_RI; /* Default line settings */ |
| 466 | IRDA_DEBUG(2, "%s(), IrCOMM device\n", __FUNCTION__ ); |
| 467 | } else { |
| 468 | IRDA_DEBUG(2, "%s(), IrLPT device\n", __FUNCTION__ ); |
| 469 | self->service_type = IRCOMM_3_WIRE_RAW; |
| 470 | self->settings.service_type = IRCOMM_3_WIRE_RAW; /* Default */ |
| 471 | } |
| 472 | |
| 473 | ret = ircomm_tty_startup(self); |
| 474 | if (ret) |
| 475 | return ret; |
| 476 | |
| 477 | ret = ircomm_tty_block_til_ready(self, filp); |
| 478 | if (ret) { |
| 479 | IRDA_DEBUG(2, |
| 480 | "%s(), returning after block_til_ready with %d\n", __FUNCTION__ , |
| 481 | ret); |
| 482 | |
| 483 | return ret; |
| 484 | } |
| 485 | return 0; |
| 486 | } |
| 487 | |
| 488 | /* |
| 489 | * Function ircomm_tty_close (tty, filp) |
| 490 | * |
| 491 | * This routine is called when a particular tty device is closed. |
| 492 | * |
| 493 | */ |
| 494 | static void ircomm_tty_close(struct tty_struct *tty, struct file *filp) |
| 495 | { |
| 496 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; |
| 497 | unsigned long flags; |
| 498 | |
| 499 | IRDA_DEBUG(0, "%s()\n", __FUNCTION__ ); |
| 500 | |
| 501 | if (!tty) |
| 502 | return; |
| 503 | |
| 504 | IRDA_ASSERT(self != NULL, return;); |
| 505 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); |
| 506 | |
| 507 | spin_lock_irqsave(&self->spinlock, flags); |
| 508 | |
| 509 | if (tty_hung_up_p(filp)) { |
| 510 | spin_unlock_irqrestore(&self->spinlock, flags); |
| 511 | |
| 512 | IRDA_DEBUG(0, "%s(), returning 1\n", __FUNCTION__ ); |
| 513 | return; |
| 514 | } |
| 515 | |
| 516 | if ((tty->count == 1) && (self->open_count != 1)) { |
| 517 | /* |
| 518 | * Uh, oh. tty->count is 1, which means that the tty |
| 519 | * structure will be freed. state->count should always |
| 520 | * be one in these conditions. If it's greater than |
| 521 | * one, we've got real problems, since it means the |
| 522 | * serial port won't be shutdown. |
| 523 | */ |
| 524 | IRDA_DEBUG(0, "%s(), bad serial port count; " |
| 525 | "tty->count is 1, state->count is %d\n", __FUNCTION__ , |
| 526 | self->open_count); |
| 527 | self->open_count = 1; |
| 528 | } |
| 529 | |
| 530 | if (--self->open_count < 0) { |
| 531 | IRDA_ERROR("%s(), bad serial port count for ttys%d: %d\n", |
| 532 | __FUNCTION__, self->line, self->open_count); |
| 533 | self->open_count = 0; |
| 534 | } |
| 535 | if (self->open_count) { |
| 536 | spin_unlock_irqrestore(&self->spinlock, flags); |
| 537 | |
| 538 | IRDA_DEBUG(0, "%s(), open count > 0\n", __FUNCTION__ ); |
| 539 | return; |
| 540 | } |
| 541 | |
| 542 | /* Hum... Should be test_and_set_bit ??? - Jean II */ |
| 543 | set_bit(ASYNC_B_CLOSING, &self->flags); |
| 544 | |
| 545 | /* We need to unlock here (we were unlocking at the end of this |
| 546 | * function), because tty_wait_until_sent() may schedule. |
| 547 | * I don't know if the rest should be protected somehow, |
| 548 | * so someone should check. - Jean II */ |
| 549 | spin_unlock_irqrestore(&self->spinlock, flags); |
| 550 | |
| 551 | /* |
| 552 | * Now we wait for the transmit buffer to clear; and we notify |
| 553 | * the line discipline to only process XON/XOFF characters. |
| 554 | */ |
| 555 | tty->closing = 1; |
| 556 | if (self->closing_wait != ASYNC_CLOSING_WAIT_NONE) |
| 557 | tty_wait_until_sent(tty, self->closing_wait); |
| 558 | |
| 559 | ircomm_tty_shutdown(self); |
| 560 | |
| 561 | if (tty->driver->flush_buffer) |
| 562 | tty->driver->flush_buffer(tty); |
| 563 | if (tty->ldisc.flush_buffer) |
| 564 | tty->ldisc.flush_buffer(tty); |
| 565 | |
| 566 | tty->closing = 0; |
| 567 | self->tty = NULL; |
| 568 | |
| 569 | if (self->blocked_open) { |
| 570 | if (self->close_delay) { |
| 571 | current->state = TASK_INTERRUPTIBLE; |
| 572 | schedule_timeout(self->close_delay); |
| 573 | } |
| 574 | wake_up_interruptible(&self->open_wait); |
| 575 | } |
| 576 | |
| 577 | self->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING); |
| 578 | wake_up_interruptible(&self->close_wait); |
| 579 | } |
| 580 | |
| 581 | /* |
| 582 | * Function ircomm_tty_flush_buffer (tty) |
| 583 | * |
| 584 | * |
| 585 | * |
| 586 | */ |
| 587 | static void ircomm_tty_flush_buffer(struct tty_struct *tty) |
| 588 | { |
| 589 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; |
| 590 | |
| 591 | IRDA_ASSERT(self != NULL, return;); |
| 592 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); |
| 593 | |
| 594 | /* |
| 595 | * Let do_softint() do this to avoid race condition with |
| 596 | * do_softint() ;-) |
| 597 | */ |
| 598 | schedule_work(&self->tqueue); |
| 599 | } |
| 600 | |
| 601 | /* |
| 602 | * Function ircomm_tty_do_softint (private_) |
| 603 | * |
| 604 | * We use this routine to give the write wakeup to the user at at a |
| 605 | * safe time (as fast as possible after write have completed). This |
| 606 | * can be compared to the Tx interrupt. |
| 607 | */ |
| 608 | static void ircomm_tty_do_softint(void *private_) |
| 609 | { |
| 610 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) private_; |
| 611 | struct tty_struct *tty; |
| 612 | unsigned long flags; |
| 613 | struct sk_buff *skb, *ctrl_skb; |
| 614 | |
| 615 | IRDA_DEBUG(2, "%s()\n", __FUNCTION__ ); |
| 616 | |
| 617 | if (!self || self->magic != IRCOMM_TTY_MAGIC) |
| 618 | return; |
| 619 | |
| 620 | tty = self->tty; |
| 621 | if (!tty) |
| 622 | return; |
| 623 | |
| 624 | /* Unlink control buffer */ |
| 625 | spin_lock_irqsave(&self->spinlock, flags); |
| 626 | |
| 627 | ctrl_skb = self->ctrl_skb; |
| 628 | self->ctrl_skb = NULL; |
| 629 | |
| 630 | spin_unlock_irqrestore(&self->spinlock, flags); |
| 631 | |
| 632 | /* Flush control buffer if any */ |
| 633 | if(ctrl_skb) { |
| 634 | if(self->flow == FLOW_START) |
| 635 | ircomm_control_request(self->ircomm, ctrl_skb); |
| 636 | /* Drop reference count - see ircomm_ttp_data_request(). */ |
| 637 | dev_kfree_skb(ctrl_skb); |
| 638 | } |
| 639 | |
| 640 | if (tty->hw_stopped) |
| 641 | return; |
| 642 | |
| 643 | /* Unlink transmit buffer */ |
| 644 | spin_lock_irqsave(&self->spinlock, flags); |
| 645 | |
| 646 | skb = self->tx_skb; |
| 647 | self->tx_skb = NULL; |
| 648 | |
| 649 | spin_unlock_irqrestore(&self->spinlock, flags); |
| 650 | |
| 651 | /* Flush transmit buffer if any */ |
| 652 | if (skb) { |
| 653 | ircomm_tty_do_event(self, IRCOMM_TTY_DATA_REQUEST, skb, NULL); |
| 654 | /* Drop reference count - see ircomm_ttp_data_request(). */ |
| 655 | dev_kfree_skb(skb); |
| 656 | } |
| 657 | |
| 658 | /* Check if user (still) wants to be waken up */ |
| 659 | if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) && |
| 660 | tty->ldisc.write_wakeup) |
| 661 | { |
| 662 | (tty->ldisc.write_wakeup)(tty); |
| 663 | } |
| 664 | wake_up_interruptible(&tty->write_wait); |
| 665 | } |
| 666 | |
| 667 | /* |
| 668 | * Function ircomm_tty_write (tty, buf, count) |
| 669 | * |
| 670 | * This routine is called by the kernel to write a series of characters |
| 671 | * to the tty device. The characters may come from user space or kernel |
| 672 | * space. This routine will return the number of characters actually |
| 673 | * accepted for writing. This routine is mandatory. |
| 674 | */ |
| 675 | static int ircomm_tty_write(struct tty_struct *tty, |
| 676 | const unsigned char *buf, int count) |
| 677 | { |
| 678 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; |
| 679 | unsigned long flags; |
| 680 | struct sk_buff *skb; |
| 681 | int tailroom = 0; |
| 682 | int len = 0; |
| 683 | int size; |
| 684 | |
| 685 | IRDA_DEBUG(2, "%s(), count=%d, hw_stopped=%d\n", __FUNCTION__ , count, |
| 686 | tty->hw_stopped); |
| 687 | |
| 688 | IRDA_ASSERT(self != NULL, return -1;); |
| 689 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); |
| 690 | |
| 691 | /* We may receive packets from the TTY even before we have finished |
| 692 | * our setup. Not cool. |
| 693 | * The problem is that we don't know the final header and data size |
| 694 | * to create the proper skb, so any skb we would create would have |
| 695 | * bogus header and data size, so need care. |
| 696 | * We use a bogus header size to safely detect this condition. |
| 697 | * Another problem is that hw_stopped was set to 0 way before it |
| 698 | * should be, so we would drop this skb. It should now be fixed. |
| 699 | * One option is to not accept data until we are properly setup. |
| 700 | * But, I suspect that when it happens, the ppp line discipline |
| 701 | * just "drops" the data, which might screw up connect scripts. |
| 702 | * The second option is to create a "safe skb", with large header |
| 703 | * and small size (see ircomm_tty_open() for values). |
| 704 | * We just need to make sure that when the real values get filled, |
| 705 | * we don't mess up the original "safe skb" (see tx_data_size). |
| 706 | * Jean II */ |
| 707 | if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED) { |
| 708 | IRDA_DEBUG(1, "%s() : not initialised\n", __FUNCTION__); |
| 709 | #ifdef IRCOMM_NO_TX_BEFORE_INIT |
| 710 | /* We didn't consume anything, TTY will retry */ |
| 711 | return 0; |
| 712 | #endif |
| 713 | } |
| 714 | |
| 715 | if (count < 1) |
| 716 | return 0; |
| 717 | |
| 718 | /* Protect our manipulation of self->tx_skb and related */ |
| 719 | spin_lock_irqsave(&self->spinlock, flags); |
| 720 | |
| 721 | /* Fetch current transmit buffer */ |
| 722 | skb = self->tx_skb; |
| 723 | |
| 724 | /* |
| 725 | * Send out all the data we get, possibly as multiple fragmented |
| 726 | * frames, but this will only happen if the data is larger than the |
| 727 | * max data size. The normal case however is just the opposite, and |
| 728 | * this function may be called multiple times, and will then actually |
| 729 | * defragment the data and send it out as one packet as soon as |
| 730 | * possible, but at a safer point in time |
| 731 | */ |
| 732 | while (count) { |
| 733 | size = count; |
| 734 | |
| 735 | /* Adjust data size to the max data size */ |
| 736 | if (size > self->max_data_size) |
| 737 | size = self->max_data_size; |
| 738 | |
| 739 | /* |
| 740 | * Do we already have a buffer ready for transmit, or do |
| 741 | * we need to allocate a new frame |
| 742 | */ |
| 743 | if (skb) { |
| 744 | /* |
| 745 | * Any room for more data at the end of the current |
| 746 | * transmit buffer? Cannot use skb_tailroom, since |
| 747 | * dev_alloc_skb gives us a larger skb than we |
| 748 | * requested |
| 749 | * Note : use tx_data_size, because max_data_size |
| 750 | * may have changed and we don't want to overwrite |
| 751 | * the skb. - Jean II |
| 752 | */ |
| 753 | if ((tailroom = (self->tx_data_size - skb->len)) > 0) { |
| 754 | /* Adjust data to tailroom */ |
| 755 | if (size > tailroom) |
| 756 | size = tailroom; |
| 757 | } else { |
| 758 | /* |
| 759 | * Current transmit frame is full, so break |
| 760 | * out, so we can send it as soon as possible |
| 761 | */ |
| 762 | break; |
| 763 | } |
| 764 | } else { |
| 765 | /* Prepare a full sized frame */ |
| 766 | skb = dev_alloc_skb(self->max_data_size+ |
| 767 | self->max_header_size); |
| 768 | if (!skb) { |
| 769 | spin_unlock_irqrestore(&self->spinlock, flags); |
| 770 | return -ENOBUFS; |
| 771 | } |
| 772 | skb_reserve(skb, self->max_header_size); |
| 773 | self->tx_skb = skb; |
| 774 | /* Remember skb size because max_data_size may |
| 775 | * change later on - Jean II */ |
| 776 | self->tx_data_size = self->max_data_size; |
| 777 | } |
| 778 | |
| 779 | /* Copy data */ |
| 780 | memcpy(skb_put(skb,size), buf + len, size); |
| 781 | |
| 782 | count -= size; |
| 783 | len += size; |
| 784 | } |
| 785 | |
| 786 | spin_unlock_irqrestore(&self->spinlock, flags); |
| 787 | |
| 788 | /* |
| 789 | * Schedule a new thread which will transmit the frame as soon |
| 790 | * as possible, but at a safe point in time. We do this so the |
| 791 | * "user" can give us data multiple times, as PPP does (because of |
| 792 | * its 256 byte tx buffer). We will then defragment and send out |
| 793 | * all this data as one single packet. |
| 794 | */ |
| 795 | schedule_work(&self->tqueue); |
| 796 | |
| 797 | return len; |
| 798 | } |
| 799 | |
| 800 | /* |
| 801 | * Function ircomm_tty_write_room (tty) |
| 802 | * |
| 803 | * This routine returns the numbers of characters the tty driver will |
| 804 | * accept for queuing to be written. This number is subject to change as |
| 805 | * output buffers get emptied, or if the output flow control is acted. |
| 806 | */ |
| 807 | static int ircomm_tty_write_room(struct tty_struct *tty) |
| 808 | { |
| 809 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; |
| 810 | unsigned long flags; |
| 811 | int ret; |
| 812 | |
| 813 | IRDA_ASSERT(self != NULL, return -1;); |
| 814 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); |
| 815 | |
| 816 | #ifdef IRCOMM_NO_TX_BEFORE_INIT |
| 817 | /* max_header_size tells us if the channel is initialised or not. */ |
| 818 | if (self->max_header_size == IRCOMM_TTY_HDR_UNINITIALISED) |
| 819 | /* Don't bother us yet */ |
| 820 | return 0; |
| 821 | #endif |
| 822 | |
| 823 | /* Check if we are allowed to transmit any data. |
| 824 | * hw_stopped is the regular flow control. |
| 825 | * Jean II */ |
| 826 | if (tty->hw_stopped) |
| 827 | ret = 0; |
| 828 | else { |
| 829 | spin_lock_irqsave(&self->spinlock, flags); |
| 830 | if (self->tx_skb) |
| 831 | ret = self->tx_data_size - self->tx_skb->len; |
| 832 | else |
| 833 | ret = self->max_data_size; |
| 834 | spin_unlock_irqrestore(&self->spinlock, flags); |
| 835 | } |
| 836 | IRDA_DEBUG(2, "%s(), ret=%d\n", __FUNCTION__ , ret); |
| 837 | |
| 838 | return ret; |
| 839 | } |
| 840 | |
| 841 | /* |
| 842 | * Function ircomm_tty_wait_until_sent (tty, timeout) |
| 843 | * |
| 844 | * This routine waits until the device has written out all of the |
| 845 | * characters in its transmitter FIFO. |
| 846 | */ |
| 847 | static void ircomm_tty_wait_until_sent(struct tty_struct *tty, int timeout) |
| 848 | { |
| 849 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; |
| 850 | unsigned long orig_jiffies, poll_time; |
| 851 | unsigned long flags; |
| 852 | |
| 853 | IRDA_DEBUG(2, "%s()\n", __FUNCTION__ ); |
| 854 | |
| 855 | IRDA_ASSERT(self != NULL, return;); |
| 856 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); |
| 857 | |
| 858 | orig_jiffies = jiffies; |
| 859 | |
| 860 | /* Set poll time to 200 ms */ |
| 861 | poll_time = IRDA_MIN(timeout, msecs_to_jiffies(200)); |
| 862 | |
| 863 | spin_lock_irqsave(&self->spinlock, flags); |
| 864 | while (self->tx_skb && self->tx_skb->len) { |
| 865 | spin_unlock_irqrestore(&self->spinlock, flags); |
| 866 | current->state = TASK_INTERRUPTIBLE; |
| 867 | schedule_timeout(poll_time); |
| 868 | spin_lock_irqsave(&self->spinlock, flags); |
| 869 | if (signal_pending(current)) |
| 870 | break; |
| 871 | if (timeout && time_after(jiffies, orig_jiffies + timeout)) |
| 872 | break; |
| 873 | } |
| 874 | spin_unlock_irqrestore(&self->spinlock, flags); |
| 875 | current->state = TASK_RUNNING; |
| 876 | } |
| 877 | |
| 878 | /* |
| 879 | * Function ircomm_tty_throttle (tty) |
| 880 | * |
| 881 | * This routine notifies the tty driver that input buffers for the line |
| 882 | * discipline are close to full, and it should somehow signal that no |
| 883 | * more characters should be sent to the tty. |
| 884 | */ |
| 885 | static void ircomm_tty_throttle(struct tty_struct *tty) |
| 886 | { |
| 887 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; |
| 888 | |
| 889 | IRDA_DEBUG(2, "%s()\n", __FUNCTION__ ); |
| 890 | |
| 891 | IRDA_ASSERT(self != NULL, return;); |
| 892 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); |
| 893 | |
| 894 | /* Software flow control? */ |
| 895 | if (I_IXOFF(tty)) |
| 896 | ircomm_tty_send_xchar(tty, STOP_CHAR(tty)); |
| 897 | |
| 898 | /* Hardware flow control? */ |
| 899 | if (tty->termios->c_cflag & CRTSCTS) { |
| 900 | self->settings.dte &= ~IRCOMM_RTS; |
| 901 | self->settings.dte |= IRCOMM_DELTA_RTS; |
| 902 | |
| 903 | ircomm_param_request(self, IRCOMM_DTE, TRUE); |
| 904 | } |
| 905 | |
| 906 | ircomm_flow_request(self->ircomm, FLOW_STOP); |
| 907 | } |
| 908 | |
| 909 | /* |
| 910 | * Function ircomm_tty_unthrottle (tty) |
| 911 | * |
| 912 | * This routine notifies the tty drivers that it should signals that |
| 913 | * characters can now be sent to the tty without fear of overrunning the |
| 914 | * input buffers of the line disciplines. |
| 915 | */ |
| 916 | static void ircomm_tty_unthrottle(struct tty_struct *tty) |
| 917 | { |
| 918 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; |
| 919 | |
| 920 | IRDA_DEBUG(2, "%s()\n", __FUNCTION__ ); |
| 921 | |
| 922 | IRDA_ASSERT(self != NULL, return;); |
| 923 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); |
| 924 | |
| 925 | /* Using software flow control? */ |
| 926 | if (I_IXOFF(tty)) { |
| 927 | ircomm_tty_send_xchar(tty, START_CHAR(tty)); |
| 928 | } |
| 929 | |
| 930 | /* Using hardware flow control? */ |
| 931 | if (tty->termios->c_cflag & CRTSCTS) { |
| 932 | self->settings.dte |= (IRCOMM_RTS|IRCOMM_DELTA_RTS); |
| 933 | |
| 934 | ircomm_param_request(self, IRCOMM_DTE, TRUE); |
| 935 | IRDA_DEBUG(1, "%s(), FLOW_START\n", __FUNCTION__ ); |
| 936 | } |
| 937 | ircomm_flow_request(self->ircomm, FLOW_START); |
| 938 | } |
| 939 | |
| 940 | /* |
| 941 | * Function ircomm_tty_chars_in_buffer (tty) |
| 942 | * |
| 943 | * Indicates if there are any data in the buffer |
| 944 | * |
| 945 | */ |
| 946 | static int ircomm_tty_chars_in_buffer(struct tty_struct *tty) |
| 947 | { |
| 948 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; |
| 949 | unsigned long flags; |
| 950 | int len = 0; |
| 951 | |
| 952 | IRDA_ASSERT(self != NULL, return -1;); |
| 953 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); |
| 954 | |
| 955 | spin_lock_irqsave(&self->spinlock, flags); |
| 956 | |
| 957 | if (self->tx_skb) |
| 958 | len = self->tx_skb->len; |
| 959 | |
| 960 | spin_unlock_irqrestore(&self->spinlock, flags); |
| 961 | |
| 962 | return len; |
| 963 | } |
| 964 | |
| 965 | static void ircomm_tty_shutdown(struct ircomm_tty_cb *self) |
| 966 | { |
| 967 | unsigned long flags; |
| 968 | |
| 969 | IRDA_ASSERT(self != NULL, return;); |
| 970 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); |
| 971 | |
| 972 | IRDA_DEBUG(0, "%s()\n", __FUNCTION__ ); |
| 973 | |
| 974 | if (!test_and_clear_bit(ASYNC_B_INITIALIZED, &self->flags)) |
| 975 | return; |
| 976 | |
| 977 | ircomm_tty_detach_cable(self); |
| 978 | |
| 979 | spin_lock_irqsave(&self->spinlock, flags); |
| 980 | |
| 981 | del_timer(&self->watchdog_timer); |
| 982 | |
| 983 | /* Free parameter buffer */ |
| 984 | if (self->ctrl_skb) { |
| 985 | dev_kfree_skb(self->ctrl_skb); |
| 986 | self->ctrl_skb = NULL; |
| 987 | } |
| 988 | |
| 989 | /* Free transmit buffer */ |
| 990 | if (self->tx_skb) { |
| 991 | dev_kfree_skb(self->tx_skb); |
| 992 | self->tx_skb = NULL; |
| 993 | } |
| 994 | |
| 995 | if (self->ircomm) { |
| 996 | ircomm_close(self->ircomm); |
| 997 | self->ircomm = NULL; |
| 998 | } |
| 999 | |
| 1000 | spin_unlock_irqrestore(&self->spinlock, flags); |
| 1001 | } |
| 1002 | |
| 1003 | /* |
| 1004 | * Function ircomm_tty_hangup (tty) |
| 1005 | * |
| 1006 | * This routine notifies the tty driver that it should hangup the tty |
| 1007 | * device. |
| 1008 | * |
| 1009 | */ |
| 1010 | static void ircomm_tty_hangup(struct tty_struct *tty) |
| 1011 | { |
| 1012 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; |
| 1013 | unsigned long flags; |
| 1014 | |
| 1015 | IRDA_DEBUG(0, "%s()\n", __FUNCTION__ ); |
| 1016 | |
| 1017 | IRDA_ASSERT(self != NULL, return;); |
| 1018 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); |
| 1019 | |
| 1020 | if (!tty) |
| 1021 | return; |
| 1022 | |
| 1023 | /* ircomm_tty_flush_buffer(tty); */ |
| 1024 | ircomm_tty_shutdown(self); |
| 1025 | |
| 1026 | /* I guess we need to lock here - Jean II */ |
| 1027 | spin_lock_irqsave(&self->spinlock, flags); |
| 1028 | self->flags &= ~ASYNC_NORMAL_ACTIVE; |
| 1029 | self->tty = NULL; |
| 1030 | self->open_count = 0; |
| 1031 | spin_unlock_irqrestore(&self->spinlock, flags); |
| 1032 | |
| 1033 | wake_up_interruptible(&self->open_wait); |
| 1034 | } |
| 1035 | |
| 1036 | /* |
| 1037 | * Function ircomm_tty_send_xchar (tty, ch) |
| 1038 | * |
| 1039 | * This routine is used to send a high-priority XON/XOFF character to |
| 1040 | * the device. |
| 1041 | */ |
| 1042 | static void ircomm_tty_send_xchar(struct tty_struct *tty, char ch) |
| 1043 | { |
| 1044 | IRDA_DEBUG(0, "%s(), not impl\n", __FUNCTION__ ); |
| 1045 | } |
| 1046 | |
| 1047 | /* |
| 1048 | * Function ircomm_tty_start (tty) |
| 1049 | * |
| 1050 | * This routine notifies the tty driver that it resume sending |
| 1051 | * characters to the tty device. |
| 1052 | */ |
| 1053 | void ircomm_tty_start(struct tty_struct *tty) |
| 1054 | { |
| 1055 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; |
| 1056 | |
| 1057 | ircomm_flow_request(self->ircomm, FLOW_START); |
| 1058 | } |
| 1059 | |
| 1060 | /* |
| 1061 | * Function ircomm_tty_stop (tty) |
| 1062 | * |
| 1063 | * This routine notifies the tty driver that it should stop outputting |
| 1064 | * characters to the tty device. |
| 1065 | */ |
| 1066 | static void ircomm_tty_stop(struct tty_struct *tty) |
| 1067 | { |
| 1068 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) tty->driver_data; |
| 1069 | |
| 1070 | IRDA_ASSERT(self != NULL, return;); |
| 1071 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); |
| 1072 | |
| 1073 | ircomm_flow_request(self->ircomm, FLOW_STOP); |
| 1074 | } |
| 1075 | |
| 1076 | /* |
| 1077 | * Function ircomm_check_modem_status (self) |
| 1078 | * |
| 1079 | * Check for any changes in the DCE's line settings. This function should |
| 1080 | * be called whenever the dce parameter settings changes, to update the |
| 1081 | * flow control settings and other things |
| 1082 | */ |
| 1083 | void ircomm_tty_check_modem_status(struct ircomm_tty_cb *self) |
| 1084 | { |
| 1085 | struct tty_struct *tty; |
| 1086 | int status; |
| 1087 | |
| 1088 | IRDA_DEBUG(0, "%s()\n", __FUNCTION__ ); |
| 1089 | |
| 1090 | IRDA_ASSERT(self != NULL, return;); |
| 1091 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); |
| 1092 | |
| 1093 | tty = self->tty; |
| 1094 | |
| 1095 | status = self->settings.dce; |
| 1096 | |
| 1097 | if (status & IRCOMM_DCE_DELTA_ANY) { |
| 1098 | /*wake_up_interruptible(&self->delta_msr_wait);*/ |
| 1099 | } |
| 1100 | if ((self->flags & ASYNC_CHECK_CD) && (status & IRCOMM_DELTA_CD)) { |
| 1101 | IRDA_DEBUG(2, |
| 1102 | "%s(), ircomm%d CD now %s...\n", __FUNCTION__ , self->line, |
| 1103 | (status & IRCOMM_CD) ? "on" : "off"); |
| 1104 | |
| 1105 | if (status & IRCOMM_CD) { |
| 1106 | wake_up_interruptible(&self->open_wait); |
| 1107 | } else { |
| 1108 | IRDA_DEBUG(2, |
| 1109 | "%s(), Doing serial hangup..\n", __FUNCTION__ ); |
| 1110 | if (tty) |
| 1111 | tty_hangup(tty); |
| 1112 | |
| 1113 | /* Hangup will remote the tty, so better break out */ |
| 1114 | return; |
| 1115 | } |
| 1116 | } |
| 1117 | if (self->flags & ASYNC_CTS_FLOW) { |
| 1118 | if (tty->hw_stopped) { |
| 1119 | if (status & IRCOMM_CTS) { |
| 1120 | IRDA_DEBUG(2, |
| 1121 | "%s(), CTS tx start...\n", __FUNCTION__ ); |
| 1122 | tty->hw_stopped = 0; |
| 1123 | |
| 1124 | /* Wake up processes blocked on open */ |
| 1125 | wake_up_interruptible(&self->open_wait); |
| 1126 | |
| 1127 | schedule_work(&self->tqueue); |
| 1128 | return; |
| 1129 | } |
| 1130 | } else { |
| 1131 | if (!(status & IRCOMM_CTS)) { |
| 1132 | IRDA_DEBUG(2, |
| 1133 | "%s(), CTS tx stop...\n", __FUNCTION__ ); |
| 1134 | tty->hw_stopped = 1; |
| 1135 | } |
| 1136 | } |
| 1137 | } |
| 1138 | } |
| 1139 | |
| 1140 | /* |
| 1141 | * Function ircomm_tty_data_indication (instance, sap, skb) |
| 1142 | * |
| 1143 | * Handle incoming data, and deliver it to the line discipline |
| 1144 | * |
| 1145 | */ |
| 1146 | static int ircomm_tty_data_indication(void *instance, void *sap, |
| 1147 | struct sk_buff *skb) |
| 1148 | { |
| 1149 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance; |
| 1150 | |
| 1151 | IRDA_DEBUG(2, "%s()\n", __FUNCTION__ ); |
| 1152 | |
| 1153 | IRDA_ASSERT(self != NULL, return -1;); |
| 1154 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); |
| 1155 | IRDA_ASSERT(skb != NULL, return -1;); |
| 1156 | |
| 1157 | if (!self->tty) { |
| 1158 | IRDA_DEBUG(0, "%s(), no tty!\n", __FUNCTION__ ); |
| 1159 | return 0; |
| 1160 | } |
| 1161 | |
| 1162 | /* |
| 1163 | * If we receive data when hardware is stopped then something is wrong. |
| 1164 | * We try to poll the peers line settings to check if we are up todate. |
| 1165 | * Devices like WinCE can do this, and since they don't send any |
| 1166 | * params, we can just as well declare the hardware for running. |
| 1167 | */ |
| 1168 | if (self->tty->hw_stopped && (self->flow == FLOW_START)) { |
| 1169 | IRDA_DEBUG(0, "%s(), polling for line settings!\n", __FUNCTION__ ); |
| 1170 | ircomm_param_request(self, IRCOMM_POLL, TRUE); |
| 1171 | |
| 1172 | /* We can just as well declare the hardware for running */ |
| 1173 | ircomm_tty_send_initial_parameters(self); |
| 1174 | ircomm_tty_link_established(self); |
| 1175 | } |
| 1176 | |
| 1177 | /* |
| 1178 | * Just give it over to the line discipline. There is no need to |
| 1179 | * involve the flip buffers, since we are not running in an interrupt |
| 1180 | * handler |
| 1181 | */ |
| 1182 | self->tty->ldisc.receive_buf(self->tty, skb->data, NULL, skb->len); |
| 1183 | |
| 1184 | /* No need to kfree_skb - see ircomm_ttp_data_indication() */ |
| 1185 | |
| 1186 | return 0; |
| 1187 | } |
| 1188 | |
| 1189 | /* |
| 1190 | * Function ircomm_tty_control_indication (instance, sap, skb) |
| 1191 | * |
| 1192 | * Parse all incoming parameters (easy!) |
| 1193 | * |
| 1194 | */ |
| 1195 | static int ircomm_tty_control_indication(void *instance, void *sap, |
| 1196 | struct sk_buff *skb) |
| 1197 | { |
| 1198 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance; |
| 1199 | int clen; |
| 1200 | |
| 1201 | IRDA_DEBUG(4, "%s()\n", __FUNCTION__ ); |
| 1202 | |
| 1203 | IRDA_ASSERT(self != NULL, return -1;); |
| 1204 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;); |
| 1205 | IRDA_ASSERT(skb != NULL, return -1;); |
| 1206 | |
| 1207 | clen = skb->data[0]; |
| 1208 | |
| 1209 | irda_param_extract_all(self, skb->data+1, IRDA_MIN(skb->len-1, clen), |
| 1210 | &ircomm_param_info); |
| 1211 | |
| 1212 | /* No need to kfree_skb - see ircomm_control_indication() */ |
| 1213 | |
| 1214 | return 0; |
| 1215 | } |
| 1216 | |
| 1217 | /* |
| 1218 | * Function ircomm_tty_flow_indication (instance, sap, cmd) |
| 1219 | * |
| 1220 | * This function is called by IrTTP when it wants us to slow down the |
| 1221 | * transmission of data. We just mark the hardware as stopped, and wait |
| 1222 | * for IrTTP to notify us that things are OK again. |
| 1223 | */ |
| 1224 | static void ircomm_tty_flow_indication(void *instance, void *sap, |
| 1225 | LOCAL_FLOW cmd) |
| 1226 | { |
| 1227 | struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance; |
| 1228 | struct tty_struct *tty; |
| 1229 | |
| 1230 | IRDA_ASSERT(self != NULL, return;); |
| 1231 | IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;); |
| 1232 | |
| 1233 | tty = self->tty; |
| 1234 | |
| 1235 | switch (cmd) { |
| 1236 | case FLOW_START: |
| 1237 | IRDA_DEBUG(2, "%s(), hw start!\n", __FUNCTION__ ); |
| 1238 | tty->hw_stopped = 0; |
| 1239 | |
| 1240 | /* ircomm_tty_do_softint will take care of the rest */ |
| 1241 | schedule_work(&self->tqueue); |
| 1242 | break; |
| 1243 | default: /* If we get here, something is very wrong, better stop */ |
| 1244 | case FLOW_STOP: |
| 1245 | IRDA_DEBUG(2, "%s(), hw stopped!\n", __FUNCTION__ ); |
| 1246 | tty->hw_stopped = 1; |
| 1247 | break; |
| 1248 | } |
| 1249 | self->flow = cmd; |
| 1250 | } |
| 1251 | |
| 1252 | static int ircomm_tty_line_info(struct ircomm_tty_cb *self, char *buf) |
| 1253 | { |
| 1254 | int ret=0; |
| 1255 | |
| 1256 | ret += sprintf(buf+ret, "State: %s\n", ircomm_tty_state[self->state]); |
| 1257 | |
| 1258 | ret += sprintf(buf+ret, "Service type: "); |
| 1259 | if (self->service_type & IRCOMM_9_WIRE) |
| 1260 | ret += sprintf(buf+ret, "9_WIRE"); |
| 1261 | else if (self->service_type & IRCOMM_3_WIRE) |
| 1262 | ret += sprintf(buf+ret, "3_WIRE"); |
| 1263 | else if (self->service_type & IRCOMM_3_WIRE_RAW) |
| 1264 | ret += sprintf(buf+ret, "3_WIRE_RAW"); |
| 1265 | else |
| 1266 | ret += sprintf(buf+ret, "No common service type!\n"); |
| 1267 | ret += sprintf(buf+ret, "\n"); |
| 1268 | |
| 1269 | ret += sprintf(buf+ret, "Port name: %s\n", self->settings.port_name); |
| 1270 | |
| 1271 | ret += sprintf(buf+ret, "DTE status: "); |
| 1272 | if (self->settings.dte & IRCOMM_RTS) |
| 1273 | ret += sprintf(buf+ret, "RTS|"); |
| 1274 | if (self->settings.dte & IRCOMM_DTR) |
| 1275 | ret += sprintf(buf+ret, "DTR|"); |
| 1276 | if (self->settings.dte) |
| 1277 | ret--; /* remove the last | */ |
| 1278 | ret += sprintf(buf+ret, "\n"); |
| 1279 | |
| 1280 | ret += sprintf(buf+ret, "DCE status: "); |
| 1281 | if (self->settings.dce & IRCOMM_CTS) |
| 1282 | ret += sprintf(buf+ret, "CTS|"); |
| 1283 | if (self->settings.dce & IRCOMM_DSR) |
| 1284 | ret += sprintf(buf+ret, "DSR|"); |
| 1285 | if (self->settings.dce & IRCOMM_CD) |
| 1286 | ret += sprintf(buf+ret, "CD|"); |
| 1287 | if (self->settings.dce & IRCOMM_RI) |
| 1288 | ret += sprintf(buf+ret, "RI|"); |
| 1289 | if (self->settings.dce) |
| 1290 | ret--; /* remove the last | */ |
| 1291 | ret += sprintf(buf+ret, "\n"); |
| 1292 | |
| 1293 | ret += sprintf(buf+ret, "Configuration: "); |
| 1294 | if (!self->settings.null_modem) |
| 1295 | ret += sprintf(buf+ret, "DTE <-> DCE\n"); |
| 1296 | else |
| 1297 | ret += sprintf(buf+ret, |
| 1298 | "DTE <-> DTE (null modem emulation)\n"); |
| 1299 | |
| 1300 | ret += sprintf(buf+ret, "Data rate: %d\n", self->settings.data_rate); |
| 1301 | |
| 1302 | ret += sprintf(buf+ret, "Flow control: "); |
| 1303 | if (self->settings.flow_control & IRCOMM_XON_XOFF_IN) |
| 1304 | ret += sprintf(buf+ret, "XON_XOFF_IN|"); |
| 1305 | if (self->settings.flow_control & IRCOMM_XON_XOFF_OUT) |
| 1306 | ret += sprintf(buf+ret, "XON_XOFF_OUT|"); |
| 1307 | if (self->settings.flow_control & IRCOMM_RTS_CTS_IN) |
| 1308 | ret += sprintf(buf+ret, "RTS_CTS_IN|"); |
| 1309 | if (self->settings.flow_control & IRCOMM_RTS_CTS_OUT) |
| 1310 | ret += sprintf(buf+ret, "RTS_CTS_OUT|"); |
| 1311 | if (self->settings.flow_control & IRCOMM_DSR_DTR_IN) |
| 1312 | ret += sprintf(buf+ret, "DSR_DTR_IN|"); |
| 1313 | if (self->settings.flow_control & IRCOMM_DSR_DTR_OUT) |
| 1314 | ret += sprintf(buf+ret, "DSR_DTR_OUT|"); |
| 1315 | if (self->settings.flow_control & IRCOMM_ENQ_ACK_IN) |
| 1316 | ret += sprintf(buf+ret, "ENQ_ACK_IN|"); |
| 1317 | if (self->settings.flow_control & IRCOMM_ENQ_ACK_OUT) |
| 1318 | ret += sprintf(buf+ret, "ENQ_ACK_OUT|"); |
| 1319 | if (self->settings.flow_control) |
| 1320 | ret--; /* remove the last | */ |
| 1321 | ret += sprintf(buf+ret, "\n"); |
| 1322 | |
| 1323 | ret += sprintf(buf+ret, "Flags: "); |
| 1324 | if (self->flags & ASYNC_CTS_FLOW) |
| 1325 | ret += sprintf(buf+ret, "ASYNC_CTS_FLOW|"); |
| 1326 | if (self->flags & ASYNC_CHECK_CD) |
| 1327 | ret += sprintf(buf+ret, "ASYNC_CHECK_CD|"); |
| 1328 | if (self->flags & ASYNC_INITIALIZED) |
| 1329 | ret += sprintf(buf+ret, "ASYNC_INITIALIZED|"); |
| 1330 | if (self->flags & ASYNC_LOW_LATENCY) |
| 1331 | ret += sprintf(buf+ret, "ASYNC_LOW_LATENCY|"); |
| 1332 | if (self->flags & ASYNC_CLOSING) |
| 1333 | ret += sprintf(buf+ret, "ASYNC_CLOSING|"); |
| 1334 | if (self->flags & ASYNC_NORMAL_ACTIVE) |
| 1335 | ret += sprintf(buf+ret, "ASYNC_NORMAL_ACTIVE|"); |
| 1336 | if (self->flags) |
| 1337 | ret--; /* remove the last | */ |
| 1338 | ret += sprintf(buf+ret, "\n"); |
| 1339 | |
| 1340 | ret += sprintf(buf+ret, "Role: %s\n", self->client ? |
| 1341 | "client" : "server"); |
| 1342 | ret += sprintf(buf+ret, "Open count: %d\n", self->open_count); |
| 1343 | ret += sprintf(buf+ret, "Max data size: %d\n", self->max_data_size); |
| 1344 | ret += sprintf(buf+ret, "Max header size: %d\n", self->max_header_size); |
| 1345 | |
| 1346 | if (self->tty) |
| 1347 | ret += sprintf(buf+ret, "Hardware: %s\n", |
| 1348 | self->tty->hw_stopped ? "Stopped" : "Running"); |
| 1349 | |
| 1350 | ret += sprintf(buf+ret, "\n"); |
| 1351 | return ret; |
| 1352 | } |
| 1353 | |
| 1354 | |
| 1355 | /* |
| 1356 | * Function ircomm_tty_read_proc (buf, start, offset, len, eof, unused) |
| 1357 | * |
| 1358 | * |
| 1359 | * |
| 1360 | */ |
| 1361 | #ifdef CONFIG_PROC_FS |
| 1362 | static int ircomm_tty_read_proc(char *buf, char **start, off_t offset, int len, |
| 1363 | int *eof, void *unused) |
| 1364 | { |
| 1365 | struct ircomm_tty_cb *self; |
| 1366 | int count = 0, l; |
| 1367 | off_t begin = 0; |
| 1368 | unsigned long flags; |
| 1369 | |
| 1370 | spin_lock_irqsave(&ircomm_tty->hb_spinlock, flags); |
| 1371 | |
| 1372 | self = (struct ircomm_tty_cb *) hashbin_get_first(ircomm_tty); |
| 1373 | while ((self != NULL) && (count < 4000)) { |
| 1374 | if (self->magic != IRCOMM_TTY_MAGIC) |
| 1375 | break; |
| 1376 | |
| 1377 | l = ircomm_tty_line_info(self, buf + count); |
| 1378 | count += l; |
| 1379 | if (count+begin > offset+len) |
| 1380 | goto done; |
| 1381 | if (count+begin < offset) { |
| 1382 | begin += count; |
| 1383 | count = 0; |
| 1384 | } |
| 1385 | |
| 1386 | self = (struct ircomm_tty_cb *) hashbin_get_next(ircomm_tty); |
| 1387 | } |
| 1388 | *eof = 1; |
| 1389 | done: |
| 1390 | spin_unlock_irqrestore(&ircomm_tty->hb_spinlock, flags); |
| 1391 | |
| 1392 | if (offset >= count+begin) |
| 1393 | return 0; |
| 1394 | *start = buf + (offset-begin); |
| 1395 | return ((len < begin+count-offset) ? len : begin+count-offset); |
| 1396 | } |
| 1397 | #endif /* CONFIG_PROC_FS */ |
| 1398 | |
| 1399 | MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>"); |
| 1400 | MODULE_DESCRIPTION("IrCOMM serial TTY driver"); |
| 1401 | MODULE_LICENSE("GPL"); |
| 1402 | MODULE_ALIAS_CHARDEV_MAJOR(IRCOMM_TTY_MAJOR); |
| 1403 | |
| 1404 | module_init(ircomm_tty_init); |
| 1405 | module_exit(ircomm_tty_cleanup); |