Bill Pemberton | 0b52b74 | 2012-09-20 16:55:27 -0400 | [diff] [blame] | 1 | /* |
| 2 | * |
| 3 | * Copyright 1999 Digi International (www.digi.com) |
| 4 | * Gene Olson <Gene_Olson at digi dot com> |
| 5 | * James Puzzo <jamesp at digi dot com> |
| 6 | * Jeff Randall |
| 7 | * Scott Kilau <scottk at digi dot com> |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License as published by |
| 11 | * the Free Software Foundation; either version 2, or (at your option) |
| 12 | * any later version. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED; without even the |
| 16 | * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR |
| 17 | * PURPOSE. See the GNU General Public License for more details. |
| 18 | * |
| 19 | */ |
| 20 | |
| 21 | /* |
| 22 | * |
| 23 | * Filename: |
| 24 | * |
| 25 | * dgrp_tty.c |
| 26 | * |
| 27 | * Description: |
| 28 | * |
| 29 | * This file implements the tty driver functionality for the |
| 30 | * RealPort driver software. |
| 31 | * |
| 32 | * Author: |
| 33 | * |
| 34 | * James A. Puzzo |
| 35 | * Ann-Marie Westgate |
| 36 | * |
| 37 | */ |
| 38 | |
| 39 | #include <linux/slab.h> |
| 40 | #include <linux/tty.h> |
| 41 | #include <linux/tty_flip.h> |
| 42 | #include <linux/sched.h> |
| 43 | |
| 44 | #include "dgrp_common.h" |
| 45 | |
| 46 | #ifndef _POSIX_VDISABLE |
| 47 | #define _POSIX_VDISABLE ('\0') |
| 48 | #endif |
| 49 | |
| 50 | /* |
| 51 | * forward declarations |
| 52 | */ |
| 53 | |
| 54 | static void drp_param(struct ch_struct *); |
| 55 | static void dgrp_tty_close(struct tty_struct *, struct file *); |
| 56 | |
| 57 | /* ioctl helper functions */ |
| 58 | static int set_modem_info(struct ch_struct *, unsigned int, unsigned int *); |
| 59 | static int get_modem_info(struct ch_struct *, unsigned int *); |
| 60 | static void dgrp_set_custom_speed(struct ch_struct *, int); |
| 61 | static int dgrp_tty_digigetedelay(struct tty_struct *, int *); |
| 62 | static int dgrp_tty_digisetedelay(struct tty_struct *, int *); |
| 63 | static int dgrp_send_break(struct ch_struct *, int); |
| 64 | |
| 65 | static ushort tty_to_ch_flags(struct tty_struct *, char); |
| 66 | static tcflag_t ch_to_tty_flags(unsigned short, char); |
| 67 | |
| 68 | static void dgrp_tty_input_start(struct tty_struct *); |
| 69 | static void dgrp_tty_input_stop(struct tty_struct *); |
| 70 | |
| 71 | static void drp_wmove(struct ch_struct *, int, void*, int); |
| 72 | |
| 73 | static int dgrp_tty_open(struct tty_struct *, struct file *); |
| 74 | static void dgrp_tty_close(struct tty_struct *, struct file *); |
| 75 | static int dgrp_tty_write(struct tty_struct *, const unsigned char *, int); |
| 76 | static int dgrp_tty_write_room(struct tty_struct *); |
| 77 | static void dgrp_tty_flush_buffer(struct tty_struct *); |
| 78 | static int dgrp_tty_chars_in_buffer(struct tty_struct *); |
| 79 | static int dgrp_tty_ioctl(struct tty_struct *, unsigned int, unsigned long); |
| 80 | static void dgrp_tty_set_termios(struct tty_struct *, struct ktermios *); |
| 81 | static void dgrp_tty_stop(struct tty_struct *); |
| 82 | static void dgrp_tty_start(struct tty_struct *); |
| 83 | static void dgrp_tty_throttle(struct tty_struct *); |
| 84 | static void dgrp_tty_unthrottle(struct tty_struct *); |
| 85 | static void dgrp_tty_hangup(struct tty_struct *); |
| 86 | static int dgrp_tty_put_char(struct tty_struct *, unsigned char); |
| 87 | static int dgrp_tty_tiocmget(struct tty_struct *); |
| 88 | static int dgrp_tty_tiocmset(struct tty_struct *, unsigned int, unsigned int); |
| 89 | static int dgrp_tty_send_break(struct tty_struct *, int); |
| 90 | static void dgrp_tty_send_xchar(struct tty_struct *, char); |
| 91 | |
| 92 | /* |
| 93 | * tty defines |
| 94 | */ |
| 95 | #define SERIAL_TYPE_NORMAL 1 |
| 96 | #define SERIAL_TYPE_CALLOUT 2 |
| 97 | #define SERIAL_TYPE_XPRINT 3 |
| 98 | |
| 99 | |
| 100 | /* |
| 101 | * tty globals/statics |
| 102 | */ |
| 103 | |
| 104 | |
| 105 | #define PORTSERVER_DIVIDEND 1843200 |
| 106 | |
| 107 | /* |
| 108 | * Default transparent print information. |
| 109 | */ |
| 110 | static struct digi_struct digi_init = { |
| 111 | .digi_flags = DIGI_COOK, /* Flags */ |
| 112 | .digi_maxcps = 100, /* Max CPS */ |
| 113 | .digi_maxchar = 50, /* Max chars in print queue */ |
| 114 | .digi_bufsize = 100, /* Printer buffer size */ |
| 115 | .digi_onlen = 4, /* size of printer on string */ |
| 116 | .digi_offlen = 4, /* size of printer off string */ |
| 117 | .digi_onstr = "\033[5i", /* ANSI printer on string */ |
| 118 | .digi_offstr = "\033[4i", /* ANSI printer off string */ |
| 119 | .digi_term = "ansi" /* default terminal type */ |
| 120 | }; |
| 121 | |
| 122 | /* |
| 123 | * Define a local default termios struct. All ports will be created |
| 124 | * with this termios initially. |
| 125 | * |
| 126 | * This defines a raw port at 9600 baud, 8 data bits, no parity, |
| 127 | * 1 stop bit. |
| 128 | */ |
| 129 | static struct ktermios DefaultTermios = { |
| 130 | .c_iflag = (ICRNL | IXON), |
| 131 | .c_oflag = (OPOST | ONLCR), |
| 132 | .c_cflag = (B9600 | CS8 | CREAD | HUPCL | CLOCAL), |
| 133 | .c_lflag = (ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHOCTL |
| 134 | | ECHOKE | IEXTEN), |
| 135 | .c_cc = INIT_C_CC, |
| 136 | .c_line = 0, |
| 137 | }; |
| 138 | |
| 139 | /* Define our tty operations struct */ |
| 140 | static const struct tty_operations dgrp_tty_ops = { |
| 141 | .open = dgrp_tty_open, |
| 142 | .close = dgrp_tty_close, |
| 143 | .write = dgrp_tty_write, |
| 144 | .write_room = dgrp_tty_write_room, |
| 145 | .flush_buffer = dgrp_tty_flush_buffer, |
| 146 | .chars_in_buffer = dgrp_tty_chars_in_buffer, |
| 147 | .flush_chars = NULL, |
| 148 | .ioctl = dgrp_tty_ioctl, |
| 149 | .set_termios = dgrp_tty_set_termios, |
| 150 | .stop = dgrp_tty_stop, |
| 151 | .start = dgrp_tty_start, |
| 152 | .throttle = dgrp_tty_throttle, |
| 153 | .unthrottle = dgrp_tty_unthrottle, |
| 154 | .hangup = dgrp_tty_hangup, |
| 155 | .put_char = dgrp_tty_put_char, |
| 156 | .tiocmget = dgrp_tty_tiocmget, |
| 157 | .tiocmset = dgrp_tty_tiocmset, |
| 158 | .break_ctl = dgrp_tty_send_break, |
| 159 | .send_xchar = dgrp_tty_send_xchar |
| 160 | }; |
| 161 | |
| 162 | |
| 163 | static int calc_baud_rate(struct un_struct *un) |
| 164 | { |
| 165 | int i; |
| 166 | int brate; |
| 167 | |
| 168 | struct baud_rates { |
| 169 | unsigned int rate; |
| 170 | unsigned int cflag; |
| 171 | }; |
| 172 | |
| 173 | static struct baud_rates baud_rates[] = { |
| 174 | { 921600, B921600 }, |
| 175 | { 460800, B460800 }, |
| 176 | { 230400, B230400 }, |
| 177 | { 115200, B115200 }, |
| 178 | { 57600, B57600 }, |
| 179 | { 38400, B38400 }, |
| 180 | { 19200, B19200 }, |
| 181 | { 9600, B9600 }, |
| 182 | { 4800, B4800 }, |
| 183 | { 2400, B2400 }, |
| 184 | { 1200, B1200 }, |
| 185 | { 600, B600 }, |
| 186 | { 300, B300 }, |
| 187 | { 200, B200 }, |
| 188 | { 150, B150 }, |
| 189 | { 134, B134 }, |
| 190 | { 110, B110 }, |
| 191 | { 75, B75 }, |
| 192 | { 50, B50 }, |
| 193 | { 0, B9600 } |
| 194 | }; |
| 195 | |
| 196 | brate = C_BAUD(un->un_tty); |
| 197 | |
| 198 | for (i = 0; baud_rates[i].rate; i++) { |
| 199 | if (baud_rates[i].cflag == brate) |
| 200 | break; |
| 201 | } |
| 202 | |
| 203 | return baud_rates[i].rate; |
| 204 | } |
| 205 | |
| 206 | static int calc_fastbaud_rate(struct un_struct *un, struct ktermios *uts) |
| 207 | { |
| 208 | int i; |
| 209 | int brate; |
| 210 | |
| 211 | ulong bauds[2][16] = { |
| 212 | { /* fastbaud*/ |
| 213 | 0, 57600, 76800, 115200, |
| 214 | 131657, 153600, 230400, 460800, |
| 215 | 921600, 1200, 1800, 2400, |
| 216 | 4800, 9600, 19200, 38400 }, |
| 217 | { /* fastbaud & CBAUDEX */ |
| 218 | 0, 57600, 115200, 230400, |
| 219 | 460800, 150, 200, 921600, |
| 220 | 600, 1200, 1800, 2400, |
| 221 | 4800, 9600, 19200, 38400 } |
| 222 | }; |
| 223 | |
| 224 | brate = C_BAUD(un->un_tty) & 0xff; |
| 225 | |
| 226 | i = (uts->c_cflag & CBAUDEX) ? 1 : 0; |
| 227 | |
| 228 | |
| 229 | if ((i >= 0) && (i < 2) && (brate >= 0) && (brate < 16)) |
| 230 | brate = bauds[i][brate]; |
| 231 | else |
| 232 | brate = 0; |
| 233 | |
| 234 | return brate; |
| 235 | } |
| 236 | |
| 237 | /** |
| 238 | * drp_param() -- send parameter values to be sent to the node |
| 239 | * @ch: channel structure of port to modify |
| 240 | * |
| 241 | * Interprets the tty and modem changes made by an application |
| 242 | * program (by examining the termios structures) and sets up |
| 243 | * parameter values to be sent to the node. |
| 244 | */ |
| 245 | static void drp_param(struct ch_struct *ch) |
| 246 | { |
| 247 | struct nd_struct *nd; |
| 248 | struct un_struct *un; |
| 249 | int brate; |
| 250 | int mflow; |
| 251 | int xflag; |
| 252 | int iflag; |
| 253 | struct ktermios *tts, *pts, *uts; |
| 254 | |
| 255 | nd = ch->ch_nd; |
| 256 | |
| 257 | /* |
| 258 | * If the terminal device is open, use it to set up all tty |
| 259 | * modes and functions. Otherwise use the printer device. |
| 260 | */ |
| 261 | |
| 262 | if (ch->ch_tun.un_open_count) { |
| 263 | |
| 264 | un = &ch->ch_tun; |
| 265 | tts = &ch->ch_tun.un_tty->termios; |
| 266 | |
| 267 | /* |
| 268 | * If both devices are open, copy critical line |
| 269 | * parameters from the tty device to the printer, |
| 270 | * so that if the tty is closed, the printer will |
| 271 | * continue without disruption. |
| 272 | */ |
| 273 | |
| 274 | if (ch->ch_pun.un_open_count) { |
| 275 | |
| 276 | pts = &ch->ch_pun.un_tty->termios; |
| 277 | |
| 278 | pts->c_cflag ^= |
| 279 | (pts->c_cflag ^ tts->c_cflag) & |
| 280 | (CBAUD | CSIZE | CSTOPB | CREAD | PARENB | |
| 281 | PARODD | HUPCL | CLOCAL); |
| 282 | |
| 283 | pts->c_iflag ^= |
| 284 | (pts->c_iflag ^ tts->c_iflag) & |
| 285 | (IGNBRK | BRKINT | IGNPAR | PARMRK | INPCK | |
| 286 | ISTRIP | IXON | IXANY | IXOFF); |
| 287 | |
| 288 | pts->c_cc[VSTART] = tts->c_cc[VSTART]; |
| 289 | pts->c_cc[VSTOP] = tts->c_cc[VSTOP]; |
| 290 | } |
| 291 | } else if (ch->ch_pun.un_open_count == 0) { |
| 292 | pr_warn("%s - ch_pun.un_open_count shouldn't be 0\n", |
| 293 | __func__); |
| 294 | return; |
| 295 | } else { |
| 296 | un = &ch->ch_pun; |
| 297 | } |
| 298 | |
| 299 | uts = &un->un_tty->termios; |
| 300 | |
| 301 | /* |
| 302 | * Determine if FAST writes can be performed. |
| 303 | */ |
| 304 | |
| 305 | if ((ch->ch_digi.digi_flags & DIGI_COOK) != 0 && |
| 306 | (ch->ch_tun.un_open_count != 0) && |
| 307 | !((un->un_tty)->ldisc->ops->flags & LDISC_FLAG_DEFINED) && |
| 308 | !(L_XCASE(un->un_tty))) { |
| 309 | ch->ch_flag |= CH_FAST_WRITE; |
| 310 | } else { |
| 311 | ch->ch_flag &= ~CH_FAST_WRITE; |
| 312 | } |
| 313 | |
| 314 | /* |
| 315 | * If FAST writes can be performed, and OPOST is on in the |
| 316 | * terminal device, do OPOST handling in the server. |
| 317 | */ |
| 318 | |
| 319 | if ((ch->ch_flag & CH_FAST_WRITE) && |
| 320 | O_OPOST(un->un_tty) != 0) { |
| 321 | int oflag = tty_to_ch_flags(un->un_tty, 'o'); |
| 322 | |
| 323 | /* add to ch_ocook any processing flags set in the termio */ |
| 324 | ch->ch_ocook |= oflag & (OF_OLCUC | |
| 325 | OF_ONLCR | |
| 326 | OF_OCRNL | |
| 327 | OF_ONLRET | |
| 328 | OF_TABDLY); |
| 329 | |
| 330 | /* |
| 331 | * the hpux driver clears any flags set in ch_ocook |
| 332 | * from the termios oflag. It is STILL reported though |
| 333 | * by a TCGETA |
| 334 | */ |
| 335 | |
| 336 | oflag = ch_to_tty_flags(ch->ch_ocook, 'o'); |
| 337 | uts->c_oflag &= ~oflag; |
| 338 | |
| 339 | } else { |
| 340 | /* clear the ch->ch_ocook flag */ |
| 341 | int oflag = ch_to_tty_flags(ch->ch_ocook, 'o'); |
| 342 | uts->c_oflag |= oflag; |
| 343 | ch->ch_ocook = 0; |
| 344 | } |
| 345 | |
| 346 | ch->ch_oflag = ch->ch_ocook; |
| 347 | |
| 348 | |
| 349 | ch->ch_flag &= ~CH_FAST_READ; |
| 350 | |
| 351 | /* |
| 352 | * Generate channel flags |
| 353 | */ |
| 354 | |
| 355 | if (C_BAUD(un->un_tty) == B0) { |
| 356 | if (!(ch->ch_flag & CH_BAUD0)) { |
| 357 | /* TODO : the HPUX driver flushes line */ |
| 358 | /* TODO : discipline, I assume I don't have to */ |
| 359 | |
| 360 | ch->ch_tout = ch->ch_tin; |
| 361 | ch->ch_rout = ch->ch_rin; |
| 362 | |
| 363 | ch->ch_break_time = 0; |
| 364 | |
| 365 | ch->ch_send |= RR_TX_FLUSH | RR_RX_FLUSH; |
| 366 | |
| 367 | ch->ch_mout &= ~(DM_DTR | DM_RTS); |
| 368 | |
| 369 | ch->ch_flag |= CH_BAUD0; |
| 370 | } |
| 371 | } else if (ch->ch_custom_speed) { |
| 372 | ch->ch_brate = PORTSERVER_DIVIDEND / ch->ch_custom_speed ; |
| 373 | |
| 374 | if (ch->ch_flag & CH_BAUD0) { |
| 375 | ch->ch_mout |= DM_DTR | DM_RTS; |
| 376 | |
| 377 | ch->ch_flag &= ~CH_BAUD0; |
| 378 | } |
| 379 | } else { |
| 380 | /* |
| 381 | * Baud rate mapping. |
| 382 | * |
| 383 | * If FASTBAUD isn't on, we can scan the new baud rate list |
| 384 | * as required. |
| 385 | * |
| 386 | * However, if FASTBAUD is on, we must go to the old |
| 387 | * baud rate mapping that existed many many moons ago, |
| 388 | * for compatibility reasons. |
| 389 | */ |
| 390 | |
| 391 | if (!(ch->ch_digi.digi_flags & DIGI_FAST)) |
| 392 | brate = calc_baud_rate(un); |
| 393 | else |
| 394 | brate = calc_fastbaud_rate(un, uts); |
| 395 | |
| 396 | if (brate == 0) |
| 397 | brate = 9600; |
| 398 | |
| 399 | ch->ch_brate = PORTSERVER_DIVIDEND / brate; |
| 400 | |
| 401 | if (ch->ch_flag & CH_BAUD0) { |
| 402 | ch->ch_mout |= DM_DTR | DM_RTS; |
| 403 | |
| 404 | ch->ch_flag &= ~CH_BAUD0; |
| 405 | } |
| 406 | } |
| 407 | |
| 408 | /* |
| 409 | * Generate channel cflags from the termio. |
| 410 | */ |
| 411 | |
| 412 | ch->ch_cflag = tty_to_ch_flags(un->un_tty, 'c'); |
| 413 | |
| 414 | /* |
| 415 | * Generate channel iflags from the termio. |
| 416 | */ |
| 417 | |
| 418 | iflag = (int) tty_to_ch_flags(un->un_tty, 'i'); |
| 419 | |
| 420 | if (START_CHAR(un->un_tty) == _POSIX_VDISABLE || |
| 421 | STOP_CHAR(un->un_tty) == _POSIX_VDISABLE) { |
| 422 | iflag &= ~(IF_IXON | IF_IXANY | IF_IXOFF); |
| 423 | } |
| 424 | |
| 425 | ch->ch_iflag = iflag; |
| 426 | |
| 427 | /* |
| 428 | * Generate flow control characters |
| 429 | */ |
| 430 | |
| 431 | /* |
| 432 | * From the POSIX.1 spec (7.1.2.6): "If {_POSIX_VDISABLE} |
| 433 | * is defined for the terminal device file, and the value |
| 434 | * of one of the changable special control characters (see |
| 435 | * 7.1.1.9) is {_POSIX_VDISABLE}, that function shall be |
| 436 | * disabled, that is, no input data shall be recognized as |
| 437 | * the disabled special character." |
| 438 | * |
| 439 | * OK, so we don't ever assign S/DXB XON or XOFF to _POSIX_VDISABLE. |
| 440 | */ |
| 441 | |
| 442 | if (uts->c_cc[VSTART] != _POSIX_VDISABLE) |
| 443 | ch->ch_xon = uts->c_cc[VSTART]; |
| 444 | if (uts->c_cc[VSTOP] != _POSIX_VDISABLE) |
| 445 | ch->ch_xoff = uts->c_cc[VSTOP]; |
| 446 | |
| 447 | ch->ch_lnext = (uts->c_cc[VLNEXT] == _POSIX_VDISABLE ? 0 : |
| 448 | uts->c_cc[VLNEXT]); |
| 449 | |
| 450 | /* |
| 451 | * Also, if either c_cc[START] or c_cc[STOP] is set to |
| 452 | * _POSIX_VDISABLE, we can't really do software flow |
| 453 | * control--in either direction--so we turn it off as |
| 454 | * far as S/DXB is concerned. In essence, if you disable |
| 455 | * one, you disable the other too. |
| 456 | */ |
| 457 | if ((uts->c_cc[VSTART] == _POSIX_VDISABLE) || |
| 458 | (uts->c_cc[VSTOP] == _POSIX_VDISABLE)) |
| 459 | ch->ch_iflag &= ~(IF_IXOFF | IF_IXON); |
| 460 | |
| 461 | /* |
| 462 | * Update xflags. |
| 463 | */ |
| 464 | |
| 465 | xflag = 0; |
| 466 | |
| 467 | if (ch->ch_digi.digi_flags & DIGI_AIXON) |
| 468 | xflag = XF_XIXON; |
| 469 | |
| 470 | if ((ch->ch_xxon == _POSIX_VDISABLE) || |
| 471 | (ch->ch_xxoff == _POSIX_VDISABLE)) |
| 472 | xflag &= ~XF_XIXON; |
| 473 | |
| 474 | ch->ch_xflag = xflag; |
| 475 | |
| 476 | |
| 477 | /* |
| 478 | * Figure effective DCD value. |
| 479 | */ |
| 480 | |
| 481 | if (C_CLOCAL(un->un_tty)) |
| 482 | ch->ch_flag |= CH_CLOCAL; |
| 483 | else |
| 484 | ch->ch_flag &= ~CH_CLOCAL; |
| 485 | |
| 486 | /* |
| 487 | * Check modem signals |
| 488 | */ |
| 489 | |
| 490 | dgrp_carrier(ch); |
| 491 | |
| 492 | /* |
| 493 | * Get hardware handshake value. |
| 494 | */ |
| 495 | |
| 496 | mflow = 0; |
| 497 | |
| 498 | if (C_CRTSCTS(un->un_tty)) |
| 499 | mflow |= (DM_RTS | DM_CTS); |
| 500 | |
| 501 | if (ch->ch_digi.digi_flags & RTSPACE) |
| 502 | mflow |= DM_RTS; |
| 503 | |
| 504 | if (ch->ch_digi.digi_flags & DTRPACE) |
| 505 | mflow |= DM_DTR; |
| 506 | |
| 507 | if (ch->ch_digi.digi_flags & CTSPACE) |
| 508 | mflow |= DM_CTS; |
| 509 | |
| 510 | if (ch->ch_digi.digi_flags & DSRPACE) |
| 511 | mflow |= DM_DSR; |
| 512 | |
| 513 | if (ch->ch_digi.digi_flags & DCDPACE) |
| 514 | mflow |= DM_CD; |
| 515 | |
| 516 | if (ch->ch_digi.digi_flags & DIGI_RTS_TOGGLE) |
| 517 | mflow |= DM_RTS_TOGGLE; |
| 518 | |
| 519 | ch->ch_mflow = mflow; |
| 520 | |
| 521 | /* |
| 522 | * Send the changes to the server. |
| 523 | */ |
| 524 | |
| 525 | ch->ch_flag |= CH_PARAM; |
| 526 | (ch->ch_nd)->nd_tx_work = 1; |
| 527 | |
| 528 | if (waitqueue_active(&ch->ch_flag_wait)) |
| 529 | wake_up_interruptible(&ch->ch_flag_wait); |
| 530 | } |
| 531 | |
| 532 | /* |
| 533 | * This function is just used as a callback for timeouts |
| 534 | * waiting on the ch_sleep flag. |
| 535 | */ |
| 536 | static void wake_up_drp_sleep_timer(unsigned long ptr) |
| 537 | { |
| 538 | struct ch_struct *ch = (struct ch_struct *) ptr; |
| 539 | if (ch) |
| 540 | wake_up(&ch->ch_sleep); |
| 541 | } |
| 542 | |
| 543 | |
| 544 | /* |
| 545 | * Set up our own sleep that can't be cancelled |
| 546 | * until our timeout occurs. |
| 547 | */ |
| 548 | static void drp_my_sleep(struct ch_struct *ch) |
| 549 | { |
| 550 | struct timer_list drp_wakeup_timer; |
| 551 | DECLARE_WAITQUEUE(wait, current); |
| 552 | |
| 553 | /* |
| 554 | * First make sure we're ready to receive the wakeup. |
| 555 | */ |
| 556 | |
| 557 | add_wait_queue(&ch->ch_sleep, &wait); |
| 558 | current->state = TASK_UNINTERRUPTIBLE; |
| 559 | |
| 560 | /* |
| 561 | * Since we are uninterruptible, set a timer to |
| 562 | * unset the uninterruptable state in 1 second. |
| 563 | */ |
| 564 | |
| 565 | init_timer(&drp_wakeup_timer); |
| 566 | drp_wakeup_timer.function = wake_up_drp_sleep_timer; |
| 567 | drp_wakeup_timer.data = (unsigned long) ch; |
| 568 | drp_wakeup_timer.expires = jiffies + (1 * HZ); |
| 569 | add_timer(&drp_wakeup_timer); |
| 570 | |
| 571 | schedule(); |
| 572 | |
| 573 | del_timer(&drp_wakeup_timer); |
| 574 | |
| 575 | remove_wait_queue(&ch->ch_sleep, &wait); |
| 576 | } |
| 577 | |
| 578 | /* |
| 579 | * dgrp_tty_open() |
| 580 | * |
| 581 | * returns: |
| 582 | * -EBUSY - this is a callout device and the normal device is active |
| 583 | * - there is an error in opening the tty |
| 584 | * -ENODEV - the channel does not exist |
| 585 | * -EAGAIN - we are in the middle of hanging up or closing |
| 586 | * - IMMEDIATE_OPEN fails |
| 587 | * -ENXIO or -EAGAIN |
| 588 | * - if the port is outside physical range |
| 589 | * -EINTR - the open is interrupted |
| 590 | * |
| 591 | */ |
| 592 | static int dgrp_tty_open(struct tty_struct *tty, struct file *file) |
| 593 | { |
| 594 | int retval = 0; |
| 595 | struct nd_struct *nd; |
| 596 | struct ch_struct *ch; |
| 597 | struct un_struct *un; |
| 598 | int port; |
| 599 | int delay_error; |
| 600 | int otype; |
| 601 | int unf; |
| 602 | int wait_carrier; |
| 603 | int category; |
| 604 | int counts_were_incremented = 0; |
| 605 | ulong lock_flags; |
| 606 | DECLARE_WAITQUEUE(wait, current); |
| 607 | |
| 608 | /* |
| 609 | * Do some initial checks to see if the node and port exist |
| 610 | */ |
| 611 | |
| 612 | nd = nd_struct_get(MAJOR(tty_devnum(tty))); |
| 613 | port = PORT_NUM(MINOR(tty_devnum(tty))); |
| 614 | category = OPEN_CATEGORY(MINOR(tty_devnum(tty))); |
| 615 | |
| 616 | if (!nd) |
| 617 | return -ENODEV; |
| 618 | |
| 619 | if (port >= CHAN_MAX) |
| 620 | return -ENODEV; |
| 621 | |
| 622 | /* |
| 623 | * The channel exists. |
| 624 | */ |
| 625 | |
| 626 | ch = nd->nd_chan + port; |
| 627 | |
| 628 | un = IS_PRINT(MINOR(tty_devnum(tty))) ? &ch->ch_pun : &ch->ch_tun; |
| 629 | un->un_tty = tty; |
| 630 | tty->driver_data = un; |
| 631 | |
| 632 | /* |
| 633 | * If we are in the middle of hanging up, |
| 634 | * then return an error |
| 635 | */ |
| 636 | if (tty_hung_up_p(file)) { |
| 637 | retval = ((un->un_flag & UN_HUP_NOTIFY) ? |
| 638 | -EAGAIN : -ERESTARTSYS); |
| 639 | goto done; |
| 640 | } |
| 641 | |
| 642 | /* |
| 643 | * If the port is in the middle of closing, then block |
| 644 | * until it is done, then try again. |
| 645 | */ |
| 646 | retval = wait_event_interruptible(un->un_close_wait, |
| 647 | ((un->un_flag & UN_CLOSING) == 0)); |
| 648 | |
| 649 | if (retval) |
| 650 | goto done; |
| 651 | |
| 652 | /* |
| 653 | * If the port is in the middle of a reopen after a network disconnect, |
| 654 | * wait until it is done, then try again. |
| 655 | */ |
| 656 | retval = wait_event_interruptible(ch->ch_flag_wait, |
| 657 | ((ch->ch_flag & CH_PORT_GONE) == 0)); |
| 658 | |
| 659 | if (retval) |
| 660 | goto done; |
| 661 | |
| 662 | /* |
| 663 | * If this is a callout device, then just make sure the normal |
| 664 | * device isn't being used. |
| 665 | */ |
| 666 | |
| 667 | if (tty->driver->subtype == SERIAL_TYPE_CALLOUT) { |
| 668 | if (un->un_flag & UN_NORMAL_ACTIVE) { |
| 669 | retval = -EBUSY; |
| 670 | goto done; |
| 671 | } else { |
| 672 | un->un_flag |= UN_CALLOUT_ACTIVE; |
| 673 | } |
| 674 | } |
| 675 | |
| 676 | /* |
| 677 | * Loop waiting until the open can be successfully completed. |
| 678 | */ |
| 679 | |
| 680 | spin_lock_irqsave(&nd->nd_lock, lock_flags); |
| 681 | |
| 682 | nd->nd_tx_work = 1; |
| 683 | |
| 684 | for (;;) { |
| 685 | wait_carrier = 0; |
| 686 | |
| 687 | /* |
| 688 | * Determine the open type from the flags provided. |
| 689 | */ |
| 690 | |
| 691 | /* |
| 692 | * If the port is not enabled, then exit |
| 693 | */ |
| 694 | if (test_bit(TTY_IO_ERROR, &tty->flags)) { |
| 695 | /* there was an error in opening the tty */ |
| 696 | if (un->un_flag & UN_CALLOUT_ACTIVE) |
| 697 | retval = -EBUSY; |
| 698 | else |
| 699 | un->un_flag |= UN_NORMAL_ACTIVE; |
| 700 | goto unlock; |
| 701 | } |
| 702 | |
| 703 | if (file->f_flags & O_NONBLOCK) { |
| 704 | |
| 705 | /* |
| 706 | * if the O_NONBLOCK is set, errors on read and write |
| 707 | * must return -EAGAIN immediately and NOT sleep |
| 708 | * on the waitqs. |
| 709 | */ |
| 710 | otype = OTYPE_IMMEDIATE; |
| 711 | delay_error = -EAGAIN; |
| 712 | |
| 713 | } else if (!OPEN_WAIT_AVAIL(category) || |
| 714 | (file->f_flags & O_NDELAY) != 0) { |
| 715 | otype = OTYPE_IMMEDIATE; |
| 716 | delay_error = -EBUSY; |
| 717 | |
| 718 | } else if (!OPEN_WAIT_CARRIER(category) || |
| 719 | ((ch->ch_digi.digi_flags & DIGI_FORCEDCD) != 0) || |
| 720 | C_CLOCAL(tty)) { |
| 721 | otype = OTYPE_PERSISTENT; |
| 722 | delay_error = 0; |
| 723 | |
| 724 | } else { |
| 725 | otype = OTYPE_INCOMING; |
| 726 | delay_error = 0; |
| 727 | } |
| 728 | |
| 729 | /* |
| 730 | * Handle port currently outside physical port range. |
| 731 | */ |
| 732 | |
| 733 | if (port >= nd->nd_chan_count) { |
| 734 | if (otype == OTYPE_IMMEDIATE) { |
| 735 | retval = (nd->nd_state == NS_READY) ? |
| 736 | -ENXIO : -EAGAIN; |
| 737 | goto unlock; |
| 738 | } |
| 739 | } |
| 740 | |
| 741 | /* |
| 742 | * Handle port not currently open. |
| 743 | */ |
| 744 | |
| 745 | else if (ch->ch_open_count == 0) { |
| 746 | /* |
| 747 | * Return an error when an Incoming Open |
| 748 | * response indicates the port is busy. |
| 749 | */ |
| 750 | |
| 751 | if (ch->ch_open_error != 0 && otype == ch->ch_otype) { |
| 752 | retval = (ch->ch_open_error <= 2) ? |
| 753 | delay_error : -ENXIO ; |
| 754 | goto unlock; |
| 755 | } |
| 756 | |
| 757 | /* |
| 758 | * Fail any new Immediate open if we do not have |
| 759 | * a normal connection to the server. |
| 760 | */ |
| 761 | |
| 762 | if (nd->nd_state != NS_READY && |
| 763 | otype == OTYPE_IMMEDIATE) { |
| 764 | retval = -EAGAIN; |
| 765 | goto unlock; |
| 766 | } |
| 767 | |
| 768 | /* |
| 769 | * If a Realport open of the correct type has |
| 770 | * succeeded, complete the open. |
| 771 | */ |
| 772 | |
| 773 | if (ch->ch_state == CS_READY && ch->ch_otype == otype) |
| 774 | break; |
| 775 | } |
| 776 | |
| 777 | /* |
| 778 | * Handle port already open and active as a device |
| 779 | * of same category. |
| 780 | */ |
| 781 | |
| 782 | else if ((ch->ch_category == category) || |
| 783 | IS_PRINT(MINOR(tty_devnum(tty)))) { |
| 784 | /* |
| 785 | * Fail if opening the device now would |
| 786 | * violate exclusive use. |
| 787 | */ |
| 788 | unf = ch->ch_tun.un_flag | ch->ch_pun.un_flag; |
| 789 | |
| 790 | if ((file->f_flags & O_EXCL) || (unf & UN_EXCL)) { |
| 791 | retval = -EBUSY; |
| 792 | goto unlock; |
| 793 | } |
| 794 | |
| 795 | /* |
| 796 | * If the open device is in the hangup state, all |
| 797 | * system calls fail except close(). |
| 798 | */ |
| 799 | |
| 800 | /* TODO : check on hangup_p calls */ |
| 801 | |
| 802 | if (ch->ch_flag & CH_HANGUP) { |
| 803 | retval = -ENXIO; |
| 804 | goto unlock; |
| 805 | } |
| 806 | |
| 807 | /* |
| 808 | * If the port is ready, and carrier is ignored |
| 809 | * or present, then complete the open. |
| 810 | */ |
| 811 | |
| 812 | if (ch->ch_state == CS_READY && |
| 813 | (otype != OTYPE_INCOMING || |
| 814 | ch->ch_flag & CH_VIRT_CD)) |
| 815 | break; |
| 816 | |
| 817 | wait_carrier = 1; |
| 818 | } |
| 819 | |
| 820 | /* |
| 821 | * Handle port active with a different category device. |
| 822 | */ |
| 823 | |
| 824 | else { |
| 825 | if (otype == OTYPE_IMMEDIATE) { |
| 826 | retval = delay_error; |
| 827 | goto unlock; |
| 828 | } |
| 829 | } |
| 830 | |
| 831 | /* |
| 832 | * Wait until conditions change, then take another |
| 833 | * try at the open. |
| 834 | */ |
| 835 | |
| 836 | ch->ch_wait_count[otype]++; |
| 837 | |
| 838 | if (wait_carrier) |
| 839 | ch->ch_wait_carrier++; |
| 840 | |
| 841 | /* |
| 842 | * Prepare the task to accept the wakeup, then |
| 843 | * release our locks and release control. |
| 844 | */ |
| 845 | |
| 846 | add_wait_queue(&ch->ch_flag_wait, &wait); |
| 847 | current->state = TASK_INTERRUPTIBLE; |
| 848 | |
| 849 | spin_unlock_irqrestore(&nd->nd_lock, lock_flags); |
| 850 | |
| 851 | /* |
| 852 | * Give up control, we'll come back if we're |
| 853 | * interrupted or are woken up. |
| 854 | */ |
| 855 | schedule(); |
| 856 | remove_wait_queue(&ch->ch_flag_wait, &wait); |
| 857 | |
| 858 | spin_lock_irqsave(&nd->nd_lock, lock_flags); |
| 859 | |
| 860 | current->state = TASK_RUNNING; |
| 861 | |
| 862 | ch->ch_wait_count[otype]--; |
| 863 | |
| 864 | if (wait_carrier) |
| 865 | ch->ch_wait_carrier--; |
| 866 | |
| 867 | nd->nd_tx_work = 1; |
| 868 | |
| 869 | if (signal_pending(current)) { |
| 870 | retval = -EINTR; |
| 871 | goto unlock; |
| 872 | } |
| 873 | } /* end for(;;) */ |
| 874 | |
| 875 | /* |
| 876 | * The open has succeeded. No turning back. |
| 877 | */ |
| 878 | counts_were_incremented = 1; |
| 879 | un->un_open_count++; |
| 880 | ch->ch_open_count++; |
| 881 | |
| 882 | /* |
| 883 | * Initialize the channel, if it's not already open. |
| 884 | */ |
| 885 | |
| 886 | if (ch->ch_open_count == 1) { |
| 887 | ch->ch_flag = 0; |
| 888 | ch->ch_inwait = 0; |
| 889 | ch->ch_category = category; |
| 890 | ch->ch_pscan_state = 0; |
| 891 | |
| 892 | /* TODO : find out what PS-1 bug Gene was referring to */ |
| 893 | /* TODO : in the following comment. */ |
| 894 | |
| 895 | ch->ch_send = RR_TX_START | RR_RX_START; /* PS-1 bug */ |
| 896 | |
| 897 | if (C_CLOCAL(tty) || |
| 898 | ch->ch_s_mlast & DM_CD || |
| 899 | ch->ch_digi.digi_flags & DIGI_FORCEDCD) |
| 900 | ch->ch_flag |= CH_VIRT_CD; |
| 901 | else if (OPEN_FORCES_CARRIER(category)) |
| 902 | ch->ch_flag |= CH_VIRT_CD; |
| 903 | |
| 904 | } |
| 905 | |
| 906 | /* |
| 907 | * Initialize the unit, if it is not already open. |
| 908 | */ |
| 909 | |
| 910 | if (un->un_open_count == 1) { |
| 911 | /* |
| 912 | * Since all terminal options are always sticky in Linux, |
| 913 | * we don't need the UN_STICKY flag to be handled specially. |
| 914 | */ |
| 915 | /* clears all the digi flags, leaves serial flags */ |
| 916 | un->un_flag &= ~UN_DIGI_MASK; |
| 917 | |
| 918 | if (file->f_flags & O_EXCL) |
| 919 | un->un_flag |= UN_EXCL; |
| 920 | |
| 921 | /* TODO : include "session" and "pgrp" */ |
| 922 | |
| 923 | /* |
| 924 | * In Linux, all terminal parameters are intended to be sticky. |
| 925 | * as a result, we "remove" the code which once reset the ports |
| 926 | * to sane values. |
| 927 | */ |
| 928 | |
| 929 | drp_param(ch); |
| 930 | |
| 931 | } |
| 932 | |
| 933 | un->un_flag |= UN_INITIALIZED; |
| 934 | |
| 935 | retval = 0; |
| 936 | |
| 937 | unlock: |
| 938 | |
| 939 | spin_unlock_irqrestore(&nd->nd_lock, lock_flags); |
| 940 | |
| 941 | done: |
| 942 | /* |
| 943 | * Linux does a close for every open, even failed ones! |
| 944 | */ |
| 945 | if (!counts_were_incremented) { |
| 946 | un->un_open_count++; |
| 947 | ch->ch_open_count++; |
| 948 | } |
| 949 | |
| 950 | if (retval) |
| 951 | dev_err(tty->dev, "tty open bad return (%i)\n", retval); |
| 952 | |
| 953 | return retval; |
| 954 | } |
| 955 | |
| 956 | |
| 957 | |
| 958 | |
| 959 | /* |
| 960 | * dgrp_tty_close() -- close function for tty_operations |
| 961 | */ |
| 962 | static void dgrp_tty_close(struct tty_struct *tty, struct file *file) |
| 963 | { |
| 964 | struct ch_struct *ch; |
| 965 | struct un_struct *un; |
| 966 | struct nd_struct *nd; |
| 967 | int tpos; |
| 968 | int port; |
| 969 | int err = 0; |
| 970 | int s = 0; |
| 971 | ulong waketime; |
| 972 | ulong lock_flags; |
| 973 | int sent_printer_offstr = 0; |
| 974 | |
| 975 | port = PORT_NUM(MINOR(tty_devnum(tty))); |
| 976 | |
| 977 | un = tty->driver_data; |
| 978 | |
| 979 | if (!un) |
| 980 | return; |
| 981 | |
| 982 | ch = un->un_ch; |
| 983 | |
| 984 | if (!ch) |
| 985 | return; |
| 986 | |
| 987 | nd = ch->ch_nd; |
| 988 | |
| 989 | if (!nd) |
| 990 | return; |
| 991 | |
| 992 | spin_lock_irqsave(&nd->nd_lock, lock_flags); |
| 993 | |
| 994 | |
| 995 | /* Used to be on channel basis, now we check on a unit basis. */ |
| 996 | if (un->un_open_count != 1) |
| 997 | goto unlock; |
| 998 | |
| 999 | /* |
| 1000 | * OK, its the last close on the unit |
| 1001 | */ |
| 1002 | un->un_flag |= UN_CLOSING; |
| 1003 | |
| 1004 | /* |
| 1005 | * Notify the discipline to only process XON/XOFF characters. |
| 1006 | */ |
| 1007 | tty->closing = 1; |
| 1008 | |
| 1009 | /* |
| 1010 | * Wait for output to drain only if this is |
| 1011 | * the last close against the channel |
| 1012 | */ |
| 1013 | |
| 1014 | if (ch->ch_open_count == 1) { |
| 1015 | /* |
| 1016 | * If its the print device, we need to ensure at all costs that |
| 1017 | * the offstr will fit. If it won't, flush our tbuf. |
| 1018 | */ |
| 1019 | if (IS_PRINT(MINOR(tty_devnum(tty))) && |
| 1020 | (((ch->ch_tout - ch->ch_tin - 1) & TBUF_MASK) < |
| 1021 | ch->ch_digi.digi_offlen)) |
| 1022 | ch->ch_tin = ch->ch_tout; |
| 1023 | |
| 1024 | /* |
| 1025 | * Turn off the printer. Don't bother checking to see if its |
| 1026 | * IS_PRINT... Since this is the last close the flag is going |
| 1027 | * to be cleared, so we MUST make sure the offstr gets inserted |
| 1028 | * into tbuf. |
| 1029 | */ |
| 1030 | |
| 1031 | if ((ch->ch_flag & CH_PRON) != 0) { |
| 1032 | drp_wmove(ch, 0, ch->ch_digi.digi_offstr, |
| 1033 | ch->ch_digi.digi_offlen); |
| 1034 | ch->ch_flag &= ~CH_PRON; |
| 1035 | sent_printer_offstr = 1; |
| 1036 | } |
| 1037 | } |
| 1038 | |
| 1039 | /* |
| 1040 | * Wait until either the output queue has drained, or we see |
| 1041 | * absolutely no progress for 15 seconds. |
| 1042 | */ |
| 1043 | |
| 1044 | tpos = ch->ch_s_tpos; |
| 1045 | |
| 1046 | waketime = jiffies + 15 * HZ; |
| 1047 | |
| 1048 | for (;;) { |
| 1049 | |
| 1050 | /* |
| 1051 | * Make sure the port still exists. |
| 1052 | */ |
| 1053 | |
| 1054 | if (port >= nd->nd_chan_count) { |
| 1055 | err = 1; |
| 1056 | break; |
| 1057 | } |
| 1058 | |
| 1059 | if (signal_pending(current)) { |
| 1060 | err = 1; |
| 1061 | break; |
| 1062 | } |
| 1063 | |
| 1064 | /* |
| 1065 | * If the port is idle (not opened on the server), we have |
| 1066 | * no way of draining/flushing/closing the port on that server. |
| 1067 | * So break out of loop. |
| 1068 | */ |
| 1069 | if (ch->ch_state == CS_IDLE) |
| 1070 | break; |
| 1071 | |
| 1072 | nd->nd_tx_work = 1; |
| 1073 | |
| 1074 | /* |
| 1075 | * Exit if the queues for this unit are empty, |
| 1076 | * and either the other unit is still open or all |
| 1077 | * data has drained. |
| 1078 | */ |
| 1079 | |
| 1080 | if ((un->un_tty)->ops->chars_in_buffer ? |
| 1081 | ((un->un_tty)->ops->chars_in_buffer)(un->un_tty) == 0 : 1) { |
| 1082 | |
| 1083 | /* |
| 1084 | * We don't need to wait for a buffer to drain |
| 1085 | * if the other unit is open. |
| 1086 | */ |
| 1087 | |
| 1088 | if (ch->ch_open_count != un->un_open_count) |
| 1089 | break; |
| 1090 | |
| 1091 | /* |
| 1092 | * The wait is complete when all queues are |
| 1093 | * drained, and any break in progress is complete. |
| 1094 | */ |
| 1095 | |
| 1096 | if (ch->ch_tin == ch->ch_tout && |
| 1097 | ch->ch_s_tin == ch->ch_s_tpos && |
| 1098 | (ch->ch_send & RR_TX_BREAK) == 0) { |
| 1099 | break; |
| 1100 | } |
| 1101 | } |
| 1102 | |
| 1103 | /* |
| 1104 | * Flush TX data and exit the wait if NDELAY is set, |
| 1105 | * or this is not a DIGI printer, and the close timeout |
| 1106 | * expires. |
| 1107 | */ |
| 1108 | |
| 1109 | if ((file->f_flags & (O_NDELAY | O_NONBLOCK)) || |
| 1110 | ((long)(jiffies - waketime) >= 0 && |
| 1111 | (ch->ch_digi.digi_flags & DIGI_PRINTER) == 0)) { |
| 1112 | |
| 1113 | /* |
| 1114 | * If we sent the printer off string, we cannot |
| 1115 | * flush our internal buffers, or we might lose |
| 1116 | * the offstr. |
| 1117 | */ |
| 1118 | if (!sent_printer_offstr) |
| 1119 | dgrp_tty_flush_buffer(tty); |
| 1120 | |
| 1121 | tty_ldisc_flush(tty); |
| 1122 | break; |
| 1123 | } |
| 1124 | |
| 1125 | /* |
| 1126 | * Otherwise take a short nap. |
| 1127 | */ |
| 1128 | |
| 1129 | ch->ch_flag |= CH_DRAIN; |
| 1130 | |
| 1131 | spin_unlock_irqrestore(&nd->nd_lock, lock_flags); |
| 1132 | |
| 1133 | schedule_timeout_interruptible(1); |
| 1134 | s = signal_pending(current); |
| 1135 | |
| 1136 | spin_lock_irqsave(&nd->nd_lock, lock_flags); |
| 1137 | |
| 1138 | if (s) { |
| 1139 | /* |
| 1140 | * If we had sent the printer off string, we now have |
| 1141 | * some problems. |
| 1142 | * |
| 1143 | * The system won't let us sleep since we got an error |
| 1144 | * back from sleep, presumably because the user did |
| 1145 | * a ctrl-c... |
| 1146 | * But we need to ensure that the offstr gets sent! |
| 1147 | * Thus, we have to do something else besides sleeping. |
| 1148 | * The plan: |
| 1149 | * 1) Make this task uninterruptable. |
| 1150 | * 2) Set up a timer to go off in 1 sec. |
| 1151 | * 3) Act as tho we just got out of the sleep above. |
| 1152 | * |
| 1153 | * Thankfully, in the real world, this just |
| 1154 | * never happens. |
| 1155 | */ |
| 1156 | |
| 1157 | if (sent_printer_offstr) { |
| 1158 | spin_unlock_irqrestore(&nd->nd_lock, |
| 1159 | lock_flags); |
| 1160 | drp_my_sleep(ch); |
| 1161 | spin_lock_irqsave(&nd->nd_lock, lock_flags); |
| 1162 | } else { |
| 1163 | err = 1; |
| 1164 | break; |
| 1165 | } |
| 1166 | } |
| 1167 | |
| 1168 | /* |
| 1169 | * Restart the wait if any progress is seen. |
| 1170 | */ |
| 1171 | |
| 1172 | if (ch->ch_s_tpos != tpos) { |
| 1173 | tpos = ch->ch_s_tpos; |
| 1174 | |
| 1175 | /* TODO: this gives us timeout problems with nist ?? */ |
| 1176 | waketime = jiffies + 15 * HZ; |
| 1177 | } |
| 1178 | } |
| 1179 | |
| 1180 | /* |
| 1181 | * Close the line discipline |
| 1182 | */ |
| 1183 | |
| 1184 | /* this is done in tty_io.c */ |
| 1185 | /* if ((un->un_tty)->ldisc.close) |
| 1186 | * ((un->un_tty)->ldisc.close)(un->un_tty); |
| 1187 | */ |
| 1188 | |
| 1189 | /* don't do this here */ |
| 1190 | /* un->un_flag = 0; */ |
| 1191 | |
| 1192 | /* |
| 1193 | * Flush the receive buffer on terminal unit close only. |
| 1194 | */ |
| 1195 | |
| 1196 | if (!IS_PRINT(MINOR(tty_devnum(tty)))) |
| 1197 | ch->ch_rout = ch->ch_rin; |
| 1198 | |
| 1199 | |
| 1200 | /* |
| 1201 | * Don't permit the close to happen until we get any pending |
| 1202 | * sync request responses. |
| 1203 | * There could be other ports depending upon the response as well. |
| 1204 | * |
| 1205 | * Also, don't permit the close to happen until any parameter |
| 1206 | * changes have been sent out from the state machine as well. |
| 1207 | * This is required because of a ditty -a race with -HUPCL |
| 1208 | * We MUST make sure all channel parameters have been sent to the |
| 1209 | * Portserver before sending a close. |
| 1210 | */ |
| 1211 | |
| 1212 | if ((err != 1) && (ch->ch_state != CS_IDLE)) { |
| 1213 | spin_unlock_irqrestore(&nd->nd_lock, lock_flags); |
| 1214 | s = wait_event_interruptible(ch->ch_flag_wait, |
| 1215 | ((ch->ch_flag & (CH_WAITING_SYNC | CH_PARAM)) == 0)); |
| 1216 | spin_lock_irqsave(&nd->nd_lock, lock_flags); |
| 1217 | } |
| 1218 | |
| 1219 | /* |
| 1220 | * Cleanup the channel if last unit open. |
| 1221 | */ |
| 1222 | |
| 1223 | if (ch->ch_open_count == 1) { |
| 1224 | ch->ch_flag = 0; |
| 1225 | ch->ch_category = 0; |
| 1226 | ch->ch_send = 0; |
| 1227 | ch->ch_expect = 0; |
| 1228 | ch->ch_tout = ch->ch_tin; |
| 1229 | /* (un->un_tty)->device = 0; */ |
| 1230 | |
| 1231 | if (ch->ch_state == CS_READY) |
| 1232 | ch->ch_state = CS_SEND_CLOSE; |
| 1233 | } |
| 1234 | |
| 1235 | /* |
| 1236 | * Send the changes to the server |
| 1237 | */ |
| 1238 | if (ch->ch_state != CS_IDLE) { |
| 1239 | ch->ch_flag |= CH_PARAM; |
| 1240 | wake_up_interruptible(&ch->ch_flag_wait); |
| 1241 | } |
| 1242 | |
| 1243 | nd->nd_tx_work = 1; |
| 1244 | nd->nd_tx_ready = 1; |
| 1245 | |
| 1246 | unlock: |
| 1247 | tty->closing = 0; |
| 1248 | |
| 1249 | if (ch->ch_open_count <= 0) |
| 1250 | dev_info(tty->dev, |
| 1251 | "%s - unexpected value for ch->ch_open_count: %i\n", |
| 1252 | __func__, ch->ch_open_count); |
| 1253 | else |
| 1254 | ch->ch_open_count--; |
| 1255 | |
| 1256 | if (un->un_open_count <= 0) |
| 1257 | dev_info(tty->dev, |
| 1258 | "%s - unexpected value for un->un_open_count: %i\n", |
| 1259 | __func__, un->un_open_count); |
| 1260 | else |
| 1261 | un->un_open_count--; |
| 1262 | |
| 1263 | un->un_flag &= ~(UN_NORMAL_ACTIVE | UN_CALLOUT_ACTIVE | UN_CLOSING); |
| 1264 | if (waitqueue_active(&un->un_close_wait)) |
| 1265 | wake_up_interruptible(&un->un_close_wait); |
| 1266 | |
| 1267 | spin_unlock_irqrestore(&nd->nd_lock, lock_flags); |
| 1268 | |
| 1269 | return; |
| 1270 | |
| 1271 | } |
| 1272 | |
| 1273 | static void drp_wmove(struct ch_struct *ch, int from_user, void *buf, int count) |
| 1274 | { |
| 1275 | int n; |
| 1276 | int ret = 0; |
| 1277 | |
| 1278 | ch->ch_nd->nd_tx_work = 1; |
| 1279 | |
| 1280 | n = TBUF_MAX - ch->ch_tin; |
| 1281 | |
| 1282 | if (count >= n) { |
| 1283 | if (from_user) |
| 1284 | ret = copy_from_user(ch->ch_tbuf + ch->ch_tin, |
| 1285 | (void __user *) buf, n); |
| 1286 | else |
| 1287 | memcpy(ch->ch_tbuf + ch->ch_tin, buf, n); |
| 1288 | |
| 1289 | buf = (char *) buf + n; |
| 1290 | count -= n; |
| 1291 | ch->ch_tin = 0; |
| 1292 | } |
| 1293 | |
| 1294 | if (from_user) |
| 1295 | ret = copy_from_user(ch->ch_tbuf + ch->ch_tin, |
| 1296 | (void __user *) buf, count); |
| 1297 | else |
| 1298 | memcpy(ch->ch_tbuf + ch->ch_tin, buf, count); |
| 1299 | |
| 1300 | ch->ch_tin += count; |
| 1301 | } |
| 1302 | |
| 1303 | |
| 1304 | static int dgrp_calculate_txprint_bounds(struct ch_struct *ch, int space, |
| 1305 | int *un_flag) |
| 1306 | { |
| 1307 | clock_t tt; |
| 1308 | clock_t mt; |
| 1309 | unsigned short tmax = 0; |
| 1310 | |
| 1311 | /* |
| 1312 | * If the terminal device is busy, reschedule when |
| 1313 | * the terminal device becomes idle. |
| 1314 | */ |
| 1315 | |
| 1316 | if (ch->ch_tun.un_open_count != 0 && |
| 1317 | ch->ch_tun.un_tty->ops->chars_in_buffer && |
| 1318 | ((ch->ch_tun.un_tty->ops->chars_in_buffer)(ch->ch_tun.un_tty) != 0)) { |
| 1319 | *un_flag = UN_PWAIT; |
| 1320 | return 0; |
| 1321 | } |
| 1322 | |
| 1323 | /* |
| 1324 | * Assure that whenever there is printer data in the output |
| 1325 | * buffer, there always remains enough space after it to |
| 1326 | * turn the printer off. |
| 1327 | */ |
| 1328 | space -= ch->ch_digi.digi_offlen; |
| 1329 | |
| 1330 | if (space <= 0) { |
| 1331 | *un_flag = UN_EMPTY; |
| 1332 | return 0; |
| 1333 | } |
| 1334 | |
| 1335 | /* |
| 1336 | * We measure printer CPS speed by incrementing |
| 1337 | * ch_cpstime by (HZ / digi_maxcps) for every |
| 1338 | * character we output, restricting output so |
| 1339 | * that ch_cpstime never exceeds lbolt. |
| 1340 | * |
| 1341 | * However if output has not been done for some |
| 1342 | * time, lbolt will grow to very much larger than |
| 1343 | * ch_cpstime, which would allow essentially |
| 1344 | * unlimited amounts of output until ch_cpstime |
| 1345 | * finally caught up. To avoid this, we adjust |
| 1346 | * cps_time when necessary so the difference |
| 1347 | * between lbolt and ch_cpstime never results |
| 1348 | * in sending more than digi_bufsize characters. |
| 1349 | * |
| 1350 | * This nicely models a printer with an internal |
| 1351 | * buffer of digi_bufsize characters. |
| 1352 | * |
| 1353 | * Get the time between lbolt and ch->ch_cpstime; |
| 1354 | */ |
| 1355 | |
| 1356 | tt = jiffies - ch->ch_cpstime; |
| 1357 | |
| 1358 | /* |
| 1359 | * Compute the time required to send digi_bufsize |
| 1360 | * characters. |
| 1361 | */ |
| 1362 | |
| 1363 | mt = HZ * ch->ch_digi.digi_bufsize / ch->ch_digi.digi_maxcps; |
| 1364 | |
| 1365 | /* |
| 1366 | * Compute the number of characters that can be sent |
| 1367 | * without violating the time constraint. If the |
| 1368 | * direct calculation of this number is bigger than |
| 1369 | * digi_bufsize, limit the number to digi_bufsize, |
| 1370 | * and adjust cpstime to match. |
| 1371 | */ |
| 1372 | |
| 1373 | if ((clock_t)(tt + HZ) > (clock_t)(mt + HZ)) { |
| 1374 | tmax = ch->ch_digi.digi_bufsize; |
| 1375 | ch->ch_cpstime = jiffies - mt; |
| 1376 | } else { |
| 1377 | tmax = ch->ch_digi.digi_maxcps * tt / HZ; |
| 1378 | } |
| 1379 | |
| 1380 | /* |
| 1381 | * If the time constraint now binds, limit the transmit |
| 1382 | * count accordingly, and tentatively arrange to be |
| 1383 | * rescheduled based on time. |
| 1384 | */ |
| 1385 | |
| 1386 | if (tmax < space) { |
| 1387 | *un_flag = UN_TIME; |
| 1388 | space = tmax; |
| 1389 | } |
| 1390 | |
| 1391 | /* |
| 1392 | * Compute the total number of characters we can |
| 1393 | * output before the total number of characters known |
| 1394 | * to be in the output queue exceeds digi_maxchar. |
| 1395 | */ |
| 1396 | |
| 1397 | tmax = (ch->ch_digi.digi_maxchar - |
| 1398 | ((ch->ch_tin - ch->ch_tout) & TBUF_MASK) - |
| 1399 | ((ch->ch_s_tin - ch->ch_s_tpos) & 0xffff)); |
| 1400 | |
| 1401 | |
| 1402 | /* |
| 1403 | * If the digi_maxchar constraint now holds, limit |
| 1404 | * the transmit count accordingly, and arrange to |
| 1405 | * be rescheduled when the queue becomes empty. |
| 1406 | */ |
| 1407 | |
| 1408 | if (space > tmax) { |
| 1409 | *un_flag = UN_EMPTY; |
| 1410 | space = tmax; |
| 1411 | } |
| 1412 | |
| 1413 | if (space <= 0) |
| 1414 | *un_flag |= UN_EMPTY; |
| 1415 | |
| 1416 | return space; |
| 1417 | } |
| 1418 | |
| 1419 | |
| 1420 | static int dgrp_tty_write(struct tty_struct *tty, |
| 1421 | const unsigned char *buf, |
| 1422 | int count) |
| 1423 | { |
| 1424 | struct nd_struct *nd; |
| 1425 | struct un_struct *un; |
| 1426 | struct ch_struct *ch; |
| 1427 | int space; |
| 1428 | int n; |
| 1429 | int t; |
| 1430 | int sendcount; |
| 1431 | int un_flag; |
| 1432 | ulong lock_flags; |
| 1433 | |
| 1434 | if (tty == NULL) |
| 1435 | return 0; |
| 1436 | |
| 1437 | un = tty->driver_data; |
| 1438 | if (!un) |
| 1439 | return 0; |
| 1440 | |
| 1441 | ch = un->un_ch; |
| 1442 | if (!ch) |
| 1443 | return 0; |
| 1444 | |
| 1445 | nd = ch->ch_nd; |
| 1446 | if (!nd) |
| 1447 | return 0; |
| 1448 | |
| 1449 | /* |
| 1450 | * Ignore the request if the channel is not ready. |
| 1451 | */ |
| 1452 | if (ch->ch_state != CS_READY) |
| 1453 | return 0; |
| 1454 | |
| 1455 | spin_lock_irqsave(&dgrp_poll_data.poll_lock, lock_flags); |
| 1456 | |
| 1457 | /* |
| 1458 | * Ignore the request if output is blocked. |
| 1459 | */ |
| 1460 | if ((un->un_flag & (UN_EMPTY | UN_LOW | UN_TIME | UN_PWAIT)) != 0) { |
| 1461 | count = 0; |
| 1462 | goto out; |
| 1463 | } |
| 1464 | |
| 1465 | /* |
| 1466 | * Also ignore the request if DPA has this port open, |
| 1467 | * and is flow controlled on reading more data. |
| 1468 | */ |
| 1469 | if (nd->nd_dpa_debug && nd->nd_dpa_flag & DPA_WAIT_SPACE && |
| 1470 | nd->nd_dpa_port == MINOR(tty_devnum(ch->ch_tun.un_tty))) { |
| 1471 | count = 0; |
| 1472 | goto out; |
| 1473 | } |
| 1474 | |
| 1475 | /* |
| 1476 | * Limit amount we will write to the amount of space |
| 1477 | * available in the channel buffer. |
| 1478 | */ |
| 1479 | sendcount = 0; |
| 1480 | |
| 1481 | space = (ch->ch_tout - ch->ch_tin - 1) & TBUF_MASK; |
| 1482 | |
| 1483 | /* |
| 1484 | * Handle the printer device. |
| 1485 | */ |
| 1486 | |
| 1487 | un_flag = UN_LOW; |
| 1488 | |
| 1489 | if (IS_PRINT(MINOR(tty_devnum(tty)))) { |
| 1490 | clock_t tt; |
| 1491 | clock_t mt; |
| 1492 | unsigned short tmax = 0; |
| 1493 | |
| 1494 | /* |
| 1495 | * If the terminal device is busy, reschedule when |
| 1496 | * the terminal device becomes idle. |
| 1497 | */ |
| 1498 | |
| 1499 | if (ch->ch_tun.un_open_count != 0 && |
| 1500 | ((ch->ch_tun.un_tty->ops->chars_in_buffer)(ch->ch_tun.un_tty) != 0)) { |
| 1501 | un->un_flag |= UN_PWAIT; |
| 1502 | count = 0; |
| 1503 | goto out; |
| 1504 | } |
| 1505 | |
| 1506 | /* |
| 1507 | * Assure that whenever there is printer data in the output |
| 1508 | * buffer, there always remains enough space after it to |
| 1509 | * turn the printer off. |
| 1510 | */ |
| 1511 | space -= ch->ch_digi.digi_offlen; |
| 1512 | |
| 1513 | /* |
| 1514 | * Output the printer on string. |
| 1515 | */ |
| 1516 | |
| 1517 | if ((ch->ch_flag & CH_PRON) == 0) { |
| 1518 | space -= ch->ch_digi.digi_onlen; |
| 1519 | |
| 1520 | if (space < 0) { |
| 1521 | un->un_flag |= UN_EMPTY; |
| 1522 | (ch->ch_nd)->nd_tx_work = 1; |
| 1523 | count = 0; |
| 1524 | goto out; |
| 1525 | } |
| 1526 | |
| 1527 | drp_wmove(ch, 0, ch->ch_digi.digi_onstr, |
| 1528 | ch->ch_digi.digi_onlen); |
| 1529 | |
| 1530 | ch->ch_flag |= CH_PRON; |
| 1531 | } |
| 1532 | |
| 1533 | /* |
| 1534 | * We measure printer CPS speed by incrementing |
| 1535 | * ch_cpstime by (HZ / digi_maxcps) for every |
| 1536 | * character we output, restricting output so |
| 1537 | * that ch_cpstime never exceeds lbolt. |
| 1538 | * |
| 1539 | * However if output has not been done for some |
| 1540 | * time, lbolt will grow to very much larger than |
| 1541 | * ch_cpstime, which would allow essentially |
| 1542 | * unlimited amounts of output until ch_cpstime |
| 1543 | * finally caught up. To avoid this, we adjust |
| 1544 | * cps_time when necessary so the difference |
| 1545 | * between lbolt and ch_cpstime never results |
| 1546 | * in sending more than digi_bufsize characters. |
| 1547 | * |
| 1548 | * This nicely models a printer with an internal |
| 1549 | * buffer of digi_bufsize characters. |
| 1550 | * |
| 1551 | * Get the time between lbolt and ch->ch_cpstime; |
| 1552 | */ |
| 1553 | |
| 1554 | tt = jiffies - ch->ch_cpstime; |
| 1555 | |
| 1556 | /* |
| 1557 | * Compute the time required to send digi_bufsize |
| 1558 | * characters. |
| 1559 | */ |
| 1560 | |
| 1561 | mt = HZ * ch->ch_digi.digi_bufsize / ch->ch_digi.digi_maxcps; |
| 1562 | |
| 1563 | /* |
| 1564 | * Compute the number of characters that can be sent |
| 1565 | * without violating the time constraint. If the |
| 1566 | * direct calculation of this number is bigger than |
| 1567 | * digi_bufsize, limit the number to digi_bufsize, |
| 1568 | * and adjust cpstime to match. |
| 1569 | */ |
| 1570 | |
| 1571 | if ((clock_t)(tt + HZ) > (clock_t)(mt + HZ)) { |
| 1572 | tmax = ch->ch_digi.digi_bufsize; |
| 1573 | ch->ch_cpstime = jiffies - mt; |
| 1574 | } else { |
| 1575 | tmax = ch->ch_digi.digi_maxcps * tt / HZ; |
| 1576 | } |
| 1577 | |
| 1578 | /* |
| 1579 | * If the time constraint now binds, limit the transmit |
| 1580 | * count accordingly, and tentatively arrange to be |
| 1581 | * rescheduled based on time. |
| 1582 | */ |
| 1583 | |
| 1584 | if (tmax < space) { |
| 1585 | space = tmax; |
| 1586 | un_flag = UN_TIME; |
| 1587 | } |
| 1588 | |
| 1589 | /* |
| 1590 | * Compute the total number of characters we can |
| 1591 | * output before the total number of characters known |
| 1592 | * to be in the output queue exceeds digi_maxchar. |
| 1593 | */ |
| 1594 | |
| 1595 | tmax = (ch->ch_digi.digi_maxchar - |
| 1596 | ((ch->ch_tin - ch->ch_tout) & TBUF_MASK) - |
| 1597 | ((ch->ch_s_tin - ch->ch_s_tpos) & 0xffff)); |
| 1598 | |
| 1599 | |
| 1600 | /* |
| 1601 | * If the digi_maxchar constraint now holds, limit |
| 1602 | * the transmit count accordingly, and arrange to |
| 1603 | * be rescheduled when the queue becomes empty. |
| 1604 | */ |
| 1605 | |
| 1606 | if (space > tmax) { |
| 1607 | space = tmax; |
| 1608 | un_flag = UN_EMPTY; |
| 1609 | } |
| 1610 | |
| 1611 | } |
| 1612 | /* |
| 1613 | * Handle the terminal device. |
| 1614 | */ |
| 1615 | else { |
| 1616 | |
| 1617 | /* |
| 1618 | * If the printer device is on, turn it off. |
| 1619 | */ |
| 1620 | |
| 1621 | if ((ch->ch_flag & CH_PRON) != 0) { |
| 1622 | |
| 1623 | space -= ch->ch_digi.digi_offlen; |
| 1624 | |
| 1625 | drp_wmove(ch, 0, ch->ch_digi.digi_offstr, |
| 1626 | ch->ch_digi.digi_offlen); |
| 1627 | |
| 1628 | ch->ch_flag &= ~CH_PRON; |
| 1629 | } |
| 1630 | } |
| 1631 | |
| 1632 | /* |
| 1633 | * If space is 0 and its because the ch->tbuf |
| 1634 | * is full, then Linux will handle a callback when queue |
| 1635 | * space becomes available. |
| 1636 | * tty_write returns count = 0 |
| 1637 | */ |
| 1638 | |
| 1639 | if (space <= 0) { |
| 1640 | /* the linux tty_io.c handles this if we return 0 */ |
| 1641 | /* if (fp->flags & O_NONBLOCK) return -EAGAIN; */ |
| 1642 | |
| 1643 | un->un_flag |= UN_EMPTY; |
| 1644 | (ch->ch_nd)->nd_tx_work = 1; |
| 1645 | count = 0; |
| 1646 | goto out; |
| 1647 | } |
| 1648 | |
| 1649 | count = min(count, space); |
| 1650 | |
| 1651 | if (count > 0) { |
| 1652 | |
| 1653 | un->un_tbusy++; |
| 1654 | |
| 1655 | /* |
| 1656 | * Copy the buffer contents to the ch_tbuf |
| 1657 | * being careful to wrap around the circular queue |
| 1658 | */ |
| 1659 | |
| 1660 | t = TBUF_MAX - ch->ch_tin; |
| 1661 | n = count; |
| 1662 | |
| 1663 | if (n >= t) { |
| 1664 | memcpy(ch->ch_tbuf + ch->ch_tin, buf, t); |
| 1665 | if (nd->nd_dpa_debug && nd->nd_dpa_port == PORT_NUM(MINOR(tty_devnum(un->un_tty)))) |
| 1666 | dgrp_dpa_data(nd, 0, (char *) buf, t); |
| 1667 | buf += t; |
| 1668 | n -= t; |
| 1669 | ch->ch_tin = 0; |
| 1670 | sendcount += n; |
| 1671 | } |
| 1672 | |
| 1673 | memcpy(ch->ch_tbuf + ch->ch_tin, buf, n); |
| 1674 | if (nd->nd_dpa_debug && nd->nd_dpa_port == PORT_NUM(MINOR(tty_devnum(un->un_tty)))) |
| 1675 | dgrp_dpa_data(nd, 0, (char *) buf, n); |
| 1676 | buf += n; |
| 1677 | ch->ch_tin += n; |
| 1678 | sendcount += n; |
| 1679 | |
| 1680 | un->un_tbusy--; |
| 1681 | (ch->ch_nd)->nd_tx_work = 1; |
| 1682 | if (ch->ch_edelay != DGRP_RTIME) { |
| 1683 | (ch->ch_nd)->nd_tx_ready = 1; |
| 1684 | wake_up_interruptible(&nd->nd_tx_waitq); |
| 1685 | } |
| 1686 | } |
| 1687 | |
| 1688 | ch->ch_txcount += count; |
| 1689 | |
| 1690 | if (IS_PRINT(MINOR(tty_devnum(tty)))) { |
| 1691 | |
| 1692 | /* |
| 1693 | * Adjust ch_cpstime to account |
| 1694 | * for the characters just output. |
| 1695 | */ |
| 1696 | |
| 1697 | if (sendcount > 0) { |
| 1698 | int cc = HZ * sendcount + ch->ch_cpsrem; |
| 1699 | |
| 1700 | ch->ch_cpstime += cc / ch->ch_digi.digi_maxcps; |
| 1701 | ch->ch_cpsrem = cc % ch->ch_digi.digi_maxcps; |
| 1702 | } |
| 1703 | |
| 1704 | /* |
| 1705 | * If we are now waiting on time, schedule ourself |
| 1706 | * back when we'll be able to send a block of |
| 1707 | * digi_maxchar characters. |
| 1708 | */ |
| 1709 | |
| 1710 | if ((un_flag & UN_TIME) != 0) { |
| 1711 | ch->ch_waketime = (ch->ch_cpstime + |
| 1712 | (ch->ch_digi.digi_maxchar * HZ / |
| 1713 | ch->ch_digi.digi_maxcps)); |
| 1714 | } |
| 1715 | } |
| 1716 | |
| 1717 | /* |
| 1718 | * If the printer unit is waiting for completion |
| 1719 | * of terminal output, get him going again. |
| 1720 | */ |
| 1721 | |
| 1722 | if ((ch->ch_pun.un_flag & UN_PWAIT) != 0) |
| 1723 | (ch->ch_nd)->nd_tx_work = 1; |
| 1724 | |
| 1725 | out: |
| 1726 | spin_unlock_irqrestore(&dgrp_poll_data.poll_lock, lock_flags); |
| 1727 | |
| 1728 | return count; |
| 1729 | } |
| 1730 | |
| 1731 | |
| 1732 | /* |
| 1733 | * Put a character into ch->ch_buf |
| 1734 | * |
| 1735 | * - used by the line discipline for OPOST processing |
| 1736 | */ |
| 1737 | |
| 1738 | static int dgrp_tty_put_char(struct tty_struct *tty, unsigned char new_char) |
| 1739 | { |
| 1740 | struct un_struct *un; |
| 1741 | struct ch_struct *ch; |
| 1742 | ulong lock_flags; |
| 1743 | int space; |
| 1744 | int retval = 0; |
| 1745 | |
| 1746 | if (tty == NULL) |
| 1747 | return 0; |
| 1748 | |
| 1749 | un = tty->driver_data; |
| 1750 | if (!un) |
| 1751 | return 0; |
| 1752 | |
| 1753 | ch = un->un_ch; |
| 1754 | if (!ch) |
| 1755 | return 0; |
| 1756 | |
| 1757 | if (ch->ch_state != CS_READY) |
| 1758 | return 0; |
| 1759 | |
| 1760 | spin_lock_irqsave(&dgrp_poll_data.poll_lock, lock_flags); |
| 1761 | |
| 1762 | |
| 1763 | /* |
| 1764 | * If space is 0 and its because the ch->tbuf |
| 1765 | * Warn and dump the character, there isn't anything else |
| 1766 | * we can do about it. David_Fries@digi.com |
| 1767 | */ |
| 1768 | |
| 1769 | space = (ch->ch_tout - ch->ch_tin - 1) & TBUF_MASK; |
| 1770 | |
| 1771 | un->un_tbusy++; |
| 1772 | |
| 1773 | /* |
| 1774 | * Output the printer on string if device is TXPrint. |
| 1775 | */ |
| 1776 | if (IS_PRINT(MINOR(tty_devnum(tty))) && (ch->ch_flag & CH_PRON) == 0) { |
| 1777 | if (space < ch->ch_digi.digi_onlen) { |
| 1778 | un->un_tbusy--; |
| 1779 | goto out; |
| 1780 | } |
| 1781 | space -= ch->ch_digi.digi_onlen; |
| 1782 | drp_wmove(ch, 0, ch->ch_digi.digi_onstr, |
| 1783 | ch->ch_digi.digi_onlen); |
| 1784 | ch->ch_flag |= CH_PRON; |
| 1785 | } |
| 1786 | |
| 1787 | /* |
| 1788 | * Output the printer off string if device is NOT TXPrint. |
| 1789 | */ |
| 1790 | |
| 1791 | if (!IS_PRINT(MINOR(tty_devnum(tty))) && |
| 1792 | ((ch->ch_flag & CH_PRON) != 0)) { |
| 1793 | if (space < ch->ch_digi.digi_offlen) { |
| 1794 | un->un_tbusy--; |
| 1795 | goto out; |
| 1796 | } |
| 1797 | |
| 1798 | space -= ch->ch_digi.digi_offlen; |
| 1799 | drp_wmove(ch, 0, ch->ch_digi.digi_offstr, |
| 1800 | ch->ch_digi.digi_offlen); |
| 1801 | ch->ch_flag &= ~CH_PRON; |
| 1802 | } |
| 1803 | |
| 1804 | if (!space) { |
| 1805 | un->un_tbusy--; |
| 1806 | goto out; |
| 1807 | } |
| 1808 | |
| 1809 | /* |
| 1810 | * Copy the character to the ch_tbuf being |
| 1811 | * careful to wrap around the circular queue |
| 1812 | */ |
| 1813 | ch->ch_tbuf[ch->ch_tin] = new_char; |
| 1814 | ch->ch_tin = (1 + ch->ch_tin) & TBUF_MASK; |
| 1815 | |
| 1816 | if (IS_PRINT(MINOR(tty_devnum(tty)))) { |
| 1817 | |
| 1818 | /* |
| 1819 | * Adjust ch_cpstime to account |
| 1820 | * for the character just output. |
| 1821 | */ |
| 1822 | |
| 1823 | int cc = HZ + ch->ch_cpsrem; |
| 1824 | |
| 1825 | ch->ch_cpstime += cc / ch->ch_digi.digi_maxcps; |
| 1826 | ch->ch_cpsrem = cc % ch->ch_digi.digi_maxcps; |
| 1827 | |
| 1828 | /* |
| 1829 | * If we are now waiting on time, schedule ourself |
| 1830 | * back when we'll be able to send a block of |
| 1831 | * digi_maxchar characters. |
| 1832 | */ |
| 1833 | |
| 1834 | ch->ch_waketime = (ch->ch_cpstime + |
| 1835 | (ch->ch_digi.digi_maxchar * HZ / |
| 1836 | ch->ch_digi.digi_maxcps)); |
| 1837 | } |
| 1838 | |
| 1839 | |
| 1840 | un->un_tbusy--; |
| 1841 | (ch->ch_nd)->nd_tx_work = 1; |
| 1842 | |
| 1843 | retval = 1; |
| 1844 | out: |
| 1845 | spin_unlock_irqrestore(&dgrp_poll_data.poll_lock, lock_flags); |
| 1846 | return retval; |
| 1847 | } |
| 1848 | |
| 1849 | |
| 1850 | |
| 1851 | /* |
| 1852 | * Flush TX buffer (make in == out) |
| 1853 | * |
| 1854 | * check tty_ioctl.c -- this is called after TCOFLUSH |
| 1855 | */ |
| 1856 | static void dgrp_tty_flush_buffer(struct tty_struct *tty) |
| 1857 | { |
| 1858 | struct un_struct *un; |
| 1859 | struct ch_struct *ch; |
| 1860 | |
| 1861 | if (!tty) |
| 1862 | return; |
| 1863 | un = tty->driver_data; |
| 1864 | if (!un) |
| 1865 | return; |
| 1866 | |
| 1867 | ch = un->un_ch; |
| 1868 | if (!ch) |
| 1869 | return; |
| 1870 | |
| 1871 | ch->ch_tout = ch->ch_tin; |
| 1872 | /* do NOT do this here! */ |
| 1873 | /* ch->ch_s_tpos = ch->ch_s_tin = 0; */ |
| 1874 | |
| 1875 | /* send the flush output command now */ |
| 1876 | ch->ch_send |= RR_TX_FLUSH; |
| 1877 | (ch->ch_nd)->nd_tx_ready = 1; |
| 1878 | (ch->ch_nd)->nd_tx_work = 1; |
| 1879 | wake_up_interruptible(&(ch->ch_nd)->nd_tx_waitq); |
| 1880 | |
| 1881 | if (waitqueue_active(&tty->write_wait)) |
| 1882 | wake_up_interruptible(&tty->write_wait); |
| 1883 | |
| 1884 | tty_wakeup(tty); |
| 1885 | |
| 1886 | } |
| 1887 | |
| 1888 | /* |
| 1889 | * Return space available in Tx buffer |
| 1890 | * count = ( ch->ch_tout - ch->ch_tin ) mod (TBUF_MAX - 1) |
| 1891 | */ |
| 1892 | static int dgrp_tty_write_room(struct tty_struct *tty) |
| 1893 | { |
| 1894 | struct un_struct *un; |
| 1895 | struct ch_struct *ch; |
| 1896 | int count; |
| 1897 | |
| 1898 | if (!tty) |
| 1899 | return 0; |
| 1900 | |
| 1901 | un = tty->driver_data; |
| 1902 | if (!un) |
| 1903 | return 0; |
| 1904 | |
| 1905 | ch = un->un_ch; |
| 1906 | if (!ch) |
| 1907 | return 0; |
| 1908 | |
| 1909 | count = (ch->ch_tout - ch->ch_tin - 1) & TBUF_MASK; |
| 1910 | |
| 1911 | /* We *MUST* check this, and return 0 if the Printer Unit cannot |
| 1912 | * take any more data within its time constraints... If we don't |
| 1913 | * return 0 and the printer has hit it time constraint, the ld will |
| 1914 | * call us back doing a put_char, which cannot be rejected!!! |
| 1915 | */ |
| 1916 | if (IS_PRINT(MINOR(tty_devnum(tty)))) { |
| 1917 | int un_flag = 0; |
| 1918 | count = dgrp_calculate_txprint_bounds(ch, count, &un_flag); |
| 1919 | if (count <= 0) |
| 1920 | count = 0; |
| 1921 | |
| 1922 | ch->ch_pun.un_flag |= un_flag; |
| 1923 | (ch->ch_nd)->nd_tx_work = 1; |
| 1924 | } |
| 1925 | |
| 1926 | return count; |
| 1927 | } |
| 1928 | |
| 1929 | /* |
| 1930 | * Return number of characters that have not been transmitted yet. |
| 1931 | * chars_in_buffer = ( ch->ch_tin - ch->ch_tout ) mod (TBUF_MAX - 1) |
| 1932 | * + ( ch->ch_s_tin - ch->ch_s_tout ) mod (0xffff) |
| 1933 | * = number of characters "in transit" |
| 1934 | * |
| 1935 | * Remember that sequence number math is always with a sixteen bit |
| 1936 | * mask, not the TBUF_MASK. |
| 1937 | */ |
| 1938 | |
| 1939 | static int dgrp_tty_chars_in_buffer(struct tty_struct *tty) |
| 1940 | { |
| 1941 | struct un_struct *un; |
| 1942 | struct ch_struct *ch; |
| 1943 | int count; |
| 1944 | int count1; |
| 1945 | |
| 1946 | if (!tty) |
| 1947 | return 0; |
| 1948 | |
| 1949 | un = tty->driver_data; |
| 1950 | if (!un) |
| 1951 | return 0; |
| 1952 | |
| 1953 | ch = un->un_ch; |
| 1954 | if (!ch) |
| 1955 | return 0; |
| 1956 | |
| 1957 | count1 = count = (ch->ch_tin - ch->ch_tout) & TBUF_MASK; |
| 1958 | count += (ch->ch_s_tin - ch->ch_s_tpos) & 0xffff; |
| 1959 | /* one for tbuf, one for the PS */ |
| 1960 | |
| 1961 | /* |
| 1962 | * If we are busy transmitting add 1 |
| 1963 | */ |
| 1964 | count += un->un_tbusy; |
| 1965 | |
| 1966 | return count; |
| 1967 | } |
| 1968 | |
| 1969 | |
| 1970 | /***************************************************************************** |
| 1971 | * |
| 1972 | * Helper applications for dgrp_tty_ioctl() |
| 1973 | * |
| 1974 | ***************************************************************************** |
| 1975 | */ |
| 1976 | |
| 1977 | |
| 1978 | /** |
| 1979 | * ch_to_tty_flags() -- convert channel flags to termio flags |
| 1980 | * @ch_flag: Digi channel flags |
| 1981 | * @flagtype: type of ch_flag (iflag, oflag or cflag) |
| 1982 | * |
| 1983 | * take the channel flags of the specified type and return the |
| 1984 | * corresponding termio flag |
| 1985 | */ |
| 1986 | static tcflag_t ch_to_tty_flags(ushort ch_flag, char flagtype) |
| 1987 | { |
| 1988 | tcflag_t retval = 0; |
| 1989 | |
| 1990 | switch (flagtype) { |
| 1991 | case 'i': |
| 1992 | retval = ((ch_flag & IF_IGNBRK) ? IGNBRK : 0) |
| 1993 | | ((ch_flag & IF_BRKINT) ? BRKINT : 0) |
| 1994 | | ((ch_flag & IF_IGNPAR) ? IGNPAR : 0) |
| 1995 | | ((ch_flag & IF_PARMRK) ? PARMRK : 0) |
| 1996 | | ((ch_flag & IF_INPCK) ? INPCK : 0) |
| 1997 | | ((ch_flag & IF_ISTRIP) ? ISTRIP : 0) |
| 1998 | | ((ch_flag & IF_IXON) ? IXON : 0) |
| 1999 | | ((ch_flag & IF_IXANY) ? IXANY : 0) |
| 2000 | | ((ch_flag & IF_IXOFF) ? IXOFF : 0); |
| 2001 | break; |
| 2002 | |
| 2003 | case 'o': |
| 2004 | retval = ((ch_flag & OF_OLCUC) ? OLCUC : 0) |
| 2005 | | ((ch_flag & OF_ONLCR) ? ONLCR : 0) |
| 2006 | | ((ch_flag & OF_OCRNL) ? OCRNL : 0) |
| 2007 | | ((ch_flag & OF_ONOCR) ? ONOCR : 0) |
| 2008 | | ((ch_flag & OF_ONLRET) ? ONLRET : 0) |
| 2009 | /* | ((ch_flag & OF_OTAB3) ? OFILL : 0) */ |
| 2010 | | ((ch_flag & OF_TABDLY) ? TABDLY : 0); |
| 2011 | break; |
| 2012 | |
| 2013 | case 'c': |
| 2014 | retval = ((ch_flag & CF_CSTOPB) ? CSTOPB : 0) |
| 2015 | | ((ch_flag & CF_CREAD) ? CREAD : 0) |
| 2016 | | ((ch_flag & CF_PARENB) ? PARENB : 0) |
| 2017 | | ((ch_flag & CF_PARODD) ? PARODD : 0) |
| 2018 | | ((ch_flag & CF_HUPCL) ? HUPCL : 0); |
| 2019 | |
| 2020 | switch (ch_flag & CF_CSIZE) { |
| 2021 | case CF_CS5: |
| 2022 | retval |= CS5; |
| 2023 | break; |
| 2024 | case CF_CS6: |
| 2025 | retval |= CS6; |
| 2026 | break; |
| 2027 | case CF_CS7: |
| 2028 | retval |= CS7; |
| 2029 | break; |
| 2030 | case CF_CS8: |
| 2031 | retval |= CS8; |
| 2032 | break; |
| 2033 | default: |
| 2034 | retval |= CS8; |
| 2035 | break; |
| 2036 | } |
| 2037 | break; |
| 2038 | case 'x': |
| 2039 | break; |
| 2040 | case 'l': |
| 2041 | break; |
| 2042 | default: |
| 2043 | return 0; |
| 2044 | } |
| 2045 | |
| 2046 | return retval; |
| 2047 | } |
| 2048 | |
| 2049 | |
| 2050 | /** |
| 2051 | * tty_to_ch_flags() -- convert termio flags to digi channel flags |
| 2052 | * @tty: pointer to a TTY structure holding flag to be converted |
| 2053 | * @flagtype: identifies which flag (iflags, oflags, or cflags) should |
| 2054 | * be converted |
| 2055 | * |
| 2056 | * take the termio flag of the specified type and return the |
| 2057 | * corresponding Digi version of the flags |
| 2058 | */ |
| 2059 | static ushort tty_to_ch_flags(struct tty_struct *tty, char flagtype) |
| 2060 | { |
| 2061 | ushort retval = 0; |
| 2062 | tcflag_t tflag = 0; |
| 2063 | |
| 2064 | switch (flagtype) { |
| 2065 | case 'i': |
| 2066 | tflag = tty->termios.c_iflag; |
| 2067 | retval = (I_IGNBRK(tty) ? IF_IGNBRK : 0) |
| 2068 | | (I_BRKINT(tty) ? IF_BRKINT : 0) |
| 2069 | | (I_IGNPAR(tty) ? IF_IGNPAR : 0) |
| 2070 | | (I_PARMRK(tty) ? IF_PARMRK : 0) |
| 2071 | | (I_INPCK(tty) ? IF_INPCK : 0) |
| 2072 | | (I_ISTRIP(tty) ? IF_ISTRIP : 0) |
| 2073 | | (I_IXON(tty) ? IF_IXON : 0) |
| 2074 | | (I_IXANY(tty) ? IF_IXANY : 0) |
| 2075 | | (I_IXOFF(tty) ? IF_IXOFF : 0); |
| 2076 | break; |
| 2077 | case 'o': |
| 2078 | tflag = tty->termios.c_oflag; |
| 2079 | /* |
| 2080 | * If OPOST is set, then do the post processing in the |
| 2081 | * firmware by setting all the processing flags on. |
| 2082 | * If ~OPOST, then make sure we are not doing any |
| 2083 | * output processing!! |
| 2084 | */ |
| 2085 | if (!O_OPOST(tty)) |
| 2086 | retval = 0; |
| 2087 | else |
| 2088 | retval = (O_OLCUC(tty) ? OF_OLCUC : 0) |
| 2089 | | (O_ONLCR(tty) ? OF_ONLCR : 0) |
| 2090 | | (O_OCRNL(tty) ? OF_OCRNL : 0) |
| 2091 | | (O_ONOCR(tty) ? OF_ONOCR : 0) |
| 2092 | | (O_ONLRET(tty) ? OF_ONLRET : 0) |
| 2093 | /* | (O_OFILL(tty) ? OF_TAB3 : 0) */ |
| 2094 | | (O_TABDLY(tty) ? OF_TABDLY : 0); |
| 2095 | break; |
| 2096 | case 'c': |
| 2097 | tflag = tty->termios.c_cflag; |
| 2098 | retval = (C_CSTOPB(tty) ? CF_CSTOPB : 0) |
| 2099 | | (C_CREAD(tty) ? CF_CREAD : 0) |
| 2100 | | (C_PARENB(tty) ? CF_PARENB : 0) |
| 2101 | | (C_PARODD(tty) ? CF_PARODD : 0) |
| 2102 | | (C_HUPCL(tty) ? CF_HUPCL : 0); |
| 2103 | switch (C_CSIZE(tty)) { |
| 2104 | case CS8: |
| 2105 | retval |= CF_CS8; |
| 2106 | break; |
| 2107 | case CS7: |
| 2108 | retval |= CF_CS7; |
| 2109 | break; |
| 2110 | case CS6: |
| 2111 | retval |= CF_CS6; |
| 2112 | break; |
| 2113 | case CS5: |
| 2114 | retval |= CF_CS5; |
| 2115 | break; |
| 2116 | default: |
| 2117 | retval |= CF_CS8; |
| 2118 | break; |
| 2119 | } |
| 2120 | break; |
| 2121 | case 'x': |
| 2122 | break; |
| 2123 | case 'l': |
| 2124 | break; |
| 2125 | default: |
| 2126 | return 0; |
| 2127 | } |
| 2128 | |
| 2129 | return retval; |
| 2130 | } |
| 2131 | |
| 2132 | |
| 2133 | static int dgrp_tty_send_break(struct tty_struct *tty, int msec) |
| 2134 | { |
| 2135 | struct un_struct *un; |
| 2136 | struct ch_struct *ch; |
| 2137 | int ret = -EIO; |
| 2138 | |
| 2139 | if (!tty) |
| 2140 | return ret; |
| 2141 | |
| 2142 | un = tty->driver_data; |
| 2143 | if (!un) |
| 2144 | return ret; |
| 2145 | |
| 2146 | ch = un->un_ch; |
| 2147 | if (!ch) |
| 2148 | return ret; |
| 2149 | |
| 2150 | dgrp_send_break(ch, msec); |
| 2151 | return 0; |
| 2152 | } |
| 2153 | |
| 2154 | |
| 2155 | /* |
| 2156 | * This routine sends a break character out the serial port. |
| 2157 | * |
| 2158 | * duration is in 1/1000's of a second |
| 2159 | */ |
| 2160 | static int dgrp_send_break(struct ch_struct *ch, int msec) |
| 2161 | { |
| 2162 | ulong x; |
| 2163 | |
| 2164 | wait_event_interruptible(ch->ch_flag_wait, |
| 2165 | ((ch->ch_flag & CH_TX_BREAK) == 0)); |
| 2166 | ch->ch_break_time += max(msec, 250); |
| 2167 | ch->ch_send |= RR_TX_BREAK; |
| 2168 | ch->ch_flag |= CH_TX_BREAK; |
| 2169 | (ch->ch_nd)->nd_tx_work = 1; |
| 2170 | |
| 2171 | x = (msec * HZ) / 1000; |
| 2172 | wake_up_interruptible(&(ch->ch_nd)->nd_tx_waitq); |
| 2173 | |
| 2174 | return 0; |
| 2175 | } |
| 2176 | |
| 2177 | |
| 2178 | /* |
| 2179 | * Return modem signals to ld. |
| 2180 | */ |
| 2181 | static int dgrp_tty_tiocmget(struct tty_struct *tty) |
| 2182 | { |
| 2183 | unsigned int mlast; |
| 2184 | struct un_struct *un = tty->driver_data; |
| 2185 | struct ch_struct *ch; |
| 2186 | |
| 2187 | if (!un) |
| 2188 | return -ENODEV; |
| 2189 | |
| 2190 | ch = un->un_ch; |
| 2191 | if (!ch) |
| 2192 | return -ENODEV; |
| 2193 | |
| 2194 | mlast = ((ch->ch_s_mlast & ~(DM_RTS | DM_DTR)) | |
| 2195 | (ch->ch_mout & (DM_RTS | DM_DTR))); |
| 2196 | |
| 2197 | /* defined in /usr/include/asm/termios.h */ |
| 2198 | mlast = ((mlast & DM_RTS) ? TIOCM_RTS : 0) |
| 2199 | | ((mlast & DM_DTR) ? TIOCM_DTR : 0) |
| 2200 | | ((mlast & DM_CD) ? TIOCM_CAR : 0) |
| 2201 | | ((mlast & DM_RI) ? TIOCM_RNG : 0) |
| 2202 | | ((mlast & DM_DSR) ? TIOCM_DSR : 0) |
| 2203 | | ((mlast & DM_CTS) ? TIOCM_CTS : 0); |
| 2204 | |
| 2205 | return mlast; |
| 2206 | } |
| 2207 | |
| 2208 | |
| 2209 | /* |
| 2210 | * Set modem lines |
| 2211 | */ |
| 2212 | static int dgrp_tty_tiocmset(struct tty_struct *tty, |
| 2213 | unsigned int set, unsigned int clear) |
| 2214 | { |
| 2215 | ulong lock_flags; |
| 2216 | struct un_struct *un = tty->driver_data; |
| 2217 | struct ch_struct *ch; |
| 2218 | |
| 2219 | if (!un) |
| 2220 | return -ENODEV; |
| 2221 | |
| 2222 | ch = un->un_ch; |
| 2223 | if (!ch) |
| 2224 | return -ENODEV; |
| 2225 | |
| 2226 | if (set & TIOCM_RTS) |
| 2227 | ch->ch_mout |= DM_RTS; |
| 2228 | |
| 2229 | if (set & TIOCM_DTR) |
| 2230 | ch->ch_mout |= DM_DTR; |
| 2231 | |
| 2232 | if (clear & TIOCM_RTS) |
| 2233 | ch->ch_mout &= ~(DM_RTS); |
| 2234 | |
| 2235 | if (clear & TIOCM_DTR) |
| 2236 | ch->ch_mout &= ~(DM_DTR); |
| 2237 | |
| 2238 | spin_lock_irqsave(&(ch->ch_nd)->nd_lock, lock_flags); |
| 2239 | ch->ch_flag |= CH_PARAM; |
| 2240 | (ch->ch_nd)->nd_tx_work = 1; |
| 2241 | wake_up_interruptible(&ch->ch_flag_wait); |
| 2242 | |
| 2243 | spin_unlock_irqrestore(&(ch->ch_nd)->nd_lock, lock_flags); |
| 2244 | |
| 2245 | return 0; |
| 2246 | } |
| 2247 | |
| 2248 | |
| 2249 | |
| 2250 | /* |
| 2251 | * Get current modem status |
| 2252 | */ |
| 2253 | static int get_modem_info(struct ch_struct *ch, unsigned int *value) |
| 2254 | { |
| 2255 | unsigned int mlast; |
| 2256 | |
| 2257 | mlast = ((ch->ch_s_mlast & ~(DM_RTS | DM_DTR)) | |
| 2258 | (ch->ch_mout & (DM_RTS | DM_DTR))); |
| 2259 | |
| 2260 | /* defined in /usr/include/asm/termios.h */ |
| 2261 | mlast = ((mlast & DM_RTS) ? TIOCM_RTS : 0) |
| 2262 | | ((mlast & DM_DTR) ? TIOCM_DTR : 0) |
| 2263 | | ((mlast & DM_CD) ? TIOCM_CAR : 0) |
| 2264 | | ((mlast & DM_RI) ? TIOCM_RNG : 0) |
| 2265 | | ((mlast & DM_DSR) ? TIOCM_DSR : 0) |
| 2266 | | ((mlast & DM_CTS) ? TIOCM_CTS : 0); |
| 2267 | put_user(mlast, (unsigned int __user *) value); |
| 2268 | |
| 2269 | return 0; |
| 2270 | } |
| 2271 | |
| 2272 | /* |
| 2273 | * Set modem lines |
| 2274 | */ |
| 2275 | static int set_modem_info(struct ch_struct *ch, unsigned int command, |
| 2276 | unsigned int *value) |
| 2277 | { |
| 2278 | int error; |
| 2279 | unsigned int arg; |
| 2280 | int mval = 0; |
| 2281 | ulong lock_flags; |
| 2282 | |
| 2283 | error = access_ok(VERIFY_READ, (void __user *) value, sizeof(int)); |
| 2284 | if (error == 0) |
| 2285 | return -EFAULT; |
| 2286 | |
| 2287 | get_user(arg, (unsigned int __user *) value); |
| 2288 | mval |= ((arg & TIOCM_RTS) ? DM_RTS : 0) |
| 2289 | | ((arg & TIOCM_DTR) ? DM_DTR : 0); |
| 2290 | |
| 2291 | switch (command) { |
| 2292 | case TIOCMBIS: /* set flags */ |
| 2293 | ch->ch_mout |= mval; |
| 2294 | break; |
| 2295 | case TIOCMBIC: /* clear flags */ |
| 2296 | ch->ch_mout &= ~mval; |
| 2297 | break; |
| 2298 | case TIOCMSET: |
| 2299 | ch->ch_mout = mval; |
| 2300 | break; |
| 2301 | default: |
| 2302 | return -EINVAL; |
| 2303 | } |
| 2304 | |
| 2305 | spin_lock_irqsave(&(ch->ch_nd)->nd_lock, lock_flags); |
| 2306 | |
| 2307 | ch->ch_flag |= CH_PARAM; |
| 2308 | (ch->ch_nd)->nd_tx_work = 1; |
| 2309 | wake_up_interruptible(&ch->ch_flag_wait); |
| 2310 | |
| 2311 | spin_unlock_irqrestore(&(ch->ch_nd)->nd_lock, lock_flags); |
| 2312 | |
| 2313 | return 0; |
| 2314 | } |
| 2315 | |
| 2316 | |
| 2317 | /* |
| 2318 | * Assign the custom baud rate to the channel structure |
| 2319 | */ |
| 2320 | static void dgrp_set_custom_speed(struct ch_struct *ch, int newrate) |
| 2321 | { |
| 2322 | int testdiv; |
| 2323 | int testrate_high; |
| 2324 | int testrate_low; |
| 2325 | |
| 2326 | int deltahigh, deltalow; |
| 2327 | |
| 2328 | if (newrate < 0) |
| 2329 | newrate = 0; |
| 2330 | |
| 2331 | /* |
| 2332 | * Since the divisor is stored in a 16-bit integer, we make sure |
| 2333 | * we don't allow any rates smaller than a 16-bit integer would allow. |
| 2334 | * And of course, rates above the dividend won't fly. |
| 2335 | */ |
| 2336 | if (newrate && newrate < ((PORTSERVER_DIVIDEND / 0xFFFF) + 1)) |
| 2337 | newrate = ((PORTSERVER_DIVIDEND / 0xFFFF) + 1); |
| 2338 | if (newrate && newrate > PORTSERVER_DIVIDEND) |
| 2339 | newrate = PORTSERVER_DIVIDEND; |
| 2340 | |
| 2341 | while (newrate > 0) { |
| 2342 | testdiv = PORTSERVER_DIVIDEND / newrate; |
| 2343 | |
| 2344 | /* |
| 2345 | * If we try to figure out what rate the PortServer would use |
| 2346 | * with the test divisor, it will be either equal or higher |
| 2347 | * than the requested baud rate. If we then determine the |
| 2348 | * rate with a divisor one higher, we will get the next lower |
| 2349 | * supported rate below the requested. |
| 2350 | */ |
| 2351 | testrate_high = PORTSERVER_DIVIDEND / testdiv; |
| 2352 | testrate_low = PORTSERVER_DIVIDEND / (testdiv + 1); |
| 2353 | |
| 2354 | /* |
| 2355 | * If the rate for the requested divisor is correct, just |
| 2356 | * use it and be done. |
| 2357 | */ |
| 2358 | if (testrate_high == newrate) |
| 2359 | break; |
| 2360 | |
| 2361 | /* |
| 2362 | * Otherwise, pick the rate that is closer (i.e. whichever rate |
| 2363 | * has a smaller delta). |
| 2364 | */ |
| 2365 | deltahigh = testrate_high - newrate; |
| 2366 | deltalow = newrate - testrate_low; |
| 2367 | |
| 2368 | if (deltahigh < deltalow) |
| 2369 | newrate = testrate_high; |
| 2370 | else |
| 2371 | newrate = testrate_low; |
| 2372 | |
| 2373 | break; |
| 2374 | } |
| 2375 | |
| 2376 | ch->ch_custom_speed = newrate; |
| 2377 | |
| 2378 | drp_param(ch); |
| 2379 | |
| 2380 | return; |
| 2381 | } |
| 2382 | |
| 2383 | |
| 2384 | /* |
| 2385 | # dgrp_tty_digiseta() |
| 2386 | * |
| 2387 | * Ioctl to set the information from ditty. |
| 2388 | * |
| 2389 | * NOTE: DIGI_IXON, DSRPACE, DCDPACE, and DTRPACE are unsupported. JAR 990922 |
| 2390 | */ |
| 2391 | static int dgrp_tty_digiseta(struct tty_struct *tty, |
| 2392 | struct digi_struct *new_info) |
| 2393 | { |
| 2394 | struct un_struct *un = tty->driver_data; |
| 2395 | struct ch_struct *ch; |
| 2396 | |
| 2397 | if (!un) |
| 2398 | return -ENODEV; |
| 2399 | |
| 2400 | ch = un->un_ch; |
| 2401 | if (!ch) |
| 2402 | return -ENODEV; |
| 2403 | |
| 2404 | if (copy_from_user(&ch->ch_digi, (void __user *) new_info, |
| 2405 | sizeof(struct digi_struct))) |
| 2406 | return -EFAULT; |
| 2407 | |
| 2408 | if ((ch->ch_digi.digi_flags & RTSPACE) || |
| 2409 | (ch->ch_digi.digi_flags & CTSPACE)) |
| 2410 | tty->termios.c_cflag |= CRTSCTS; |
| 2411 | else |
| 2412 | tty->termios.c_cflag &= ~CRTSCTS; |
| 2413 | |
| 2414 | if (ch->ch_digi.digi_maxcps < 1) |
| 2415 | ch->ch_digi.digi_maxcps = 1; |
| 2416 | |
| 2417 | if (ch->ch_digi.digi_maxcps > 10000) |
| 2418 | ch->ch_digi.digi_maxcps = 10000; |
| 2419 | |
| 2420 | if (ch->ch_digi.digi_bufsize < 10) |
| 2421 | ch->ch_digi.digi_bufsize = 10; |
| 2422 | |
| 2423 | if (ch->ch_digi.digi_maxchar < 1) |
| 2424 | ch->ch_digi.digi_maxchar = 1; |
| 2425 | |
| 2426 | if (ch->ch_digi.digi_maxchar > ch->ch_digi.digi_bufsize) |
| 2427 | ch->ch_digi.digi_maxchar = ch->ch_digi.digi_bufsize; |
| 2428 | |
| 2429 | if (ch->ch_digi.digi_onlen > DIGI_PLEN) |
| 2430 | ch->ch_digi.digi_onlen = DIGI_PLEN; |
| 2431 | |
| 2432 | if (ch->ch_digi.digi_offlen > DIGI_PLEN) |
| 2433 | ch->ch_digi.digi_offlen = DIGI_PLEN; |
| 2434 | |
| 2435 | /* make the changes now */ |
| 2436 | drp_param(ch); |
| 2437 | |
| 2438 | return 0; |
| 2439 | } |
| 2440 | |
| 2441 | |
| 2442 | |
| 2443 | /* |
| 2444 | * dgrp_tty_digigetedelay() |
| 2445 | * |
| 2446 | * Ioctl to get the current edelay setting. |
| 2447 | * |
| 2448 | * |
| 2449 | * |
| 2450 | */ |
| 2451 | static int dgrp_tty_digigetedelay(struct tty_struct *tty, int *retinfo) |
| 2452 | { |
| 2453 | struct un_struct *un; |
| 2454 | struct ch_struct *ch; |
| 2455 | int tmp; |
| 2456 | |
| 2457 | if (!retinfo) |
| 2458 | return -EFAULT; |
| 2459 | |
| 2460 | if (!tty || tty->magic != TTY_MAGIC) |
| 2461 | return -EFAULT; |
| 2462 | |
| 2463 | un = tty->driver_data; |
| 2464 | |
| 2465 | if (!un) |
| 2466 | return -ENODEV; |
| 2467 | |
| 2468 | ch = un->un_ch; |
| 2469 | if (!ch) |
| 2470 | return -ENODEV; |
| 2471 | |
| 2472 | tmp = ch->ch_edelay; |
| 2473 | |
| 2474 | if (copy_to_user((void __user *) retinfo, &tmp, sizeof(*retinfo))) |
| 2475 | return -EFAULT; |
| 2476 | |
| 2477 | return 0; |
| 2478 | } |
| 2479 | |
| 2480 | |
| 2481 | /* |
| 2482 | * dgrp_tty_digisetedelay() |
| 2483 | * |
| 2484 | * Ioctl to set the EDELAY setting |
| 2485 | * |
| 2486 | */ |
| 2487 | static int dgrp_tty_digisetedelay(struct tty_struct *tty, int *new_info) |
| 2488 | { |
| 2489 | struct un_struct *un; |
| 2490 | struct ch_struct *ch; |
| 2491 | int new_digi; |
| 2492 | |
| 2493 | if (!tty || tty->magic != TTY_MAGIC) |
| 2494 | return -EFAULT; |
| 2495 | |
| 2496 | un = tty->driver_data; |
| 2497 | |
| 2498 | if (!un) |
| 2499 | return -ENODEV; |
| 2500 | |
| 2501 | ch = un->un_ch; |
| 2502 | if (!ch) |
| 2503 | return -ENODEV; |
| 2504 | |
| 2505 | if (copy_from_user(&new_digi, (void __user *)new_info, sizeof(int))) |
| 2506 | return -EFAULT; |
| 2507 | |
| 2508 | ch->ch_edelay = new_digi; |
| 2509 | |
| 2510 | /* make the changes now */ |
| 2511 | drp_param(ch); |
| 2512 | |
| 2513 | return 0; |
| 2514 | } |
| 2515 | |
| 2516 | |
| 2517 | /* |
| 2518 | * The usual assortment of ioctl's |
| 2519 | * |
| 2520 | * note: use tty_check_change to make sure that we are not |
| 2521 | * changing the state of a terminal when we are not a process |
| 2522 | * in the forground. See tty_io.c |
| 2523 | * rc = tty_check_change(tty); |
| 2524 | * if (rc) return rc; |
| 2525 | */ |
| 2526 | static int dgrp_tty_ioctl(struct tty_struct *tty, unsigned int cmd, |
| 2527 | unsigned long arg) |
| 2528 | { |
| 2529 | struct un_struct *un; |
| 2530 | struct ch_struct *ch; |
| 2531 | int rc; |
| 2532 | struct digiflow_struct dflow; |
| 2533 | |
| 2534 | if (!tty) |
| 2535 | return -ENODEV; |
| 2536 | |
| 2537 | un = tty->driver_data; |
| 2538 | if (!un) |
| 2539 | return -ENODEV; |
| 2540 | |
| 2541 | ch = un->un_ch; |
| 2542 | if (!ch) |
| 2543 | return -ENODEV; |
| 2544 | |
| 2545 | switch (cmd) { |
| 2546 | |
| 2547 | /* |
| 2548 | * Here are all the standard ioctl's that we MUST implement |
| 2549 | */ |
| 2550 | |
| 2551 | case TCSBRK: |
| 2552 | /* |
| 2553 | * TCSBRK is SVID version: non-zero arg --> no break |
| 2554 | * this behaviour is exploited by tcdrain(). |
| 2555 | * |
| 2556 | * According to POSIX.1 spec (7.2.2.1.2) breaks should be |
| 2557 | * between 0.25 and 0.5 seconds |
| 2558 | */ |
| 2559 | |
| 2560 | rc = tty_check_change(tty); |
| 2561 | if (rc) |
| 2562 | return rc; |
| 2563 | tty_wait_until_sent(tty, 0); |
| 2564 | |
| 2565 | if (!arg) |
| 2566 | rc = dgrp_send_break(ch, 250); /* 1/4 second */ |
| 2567 | |
| 2568 | if (dgrp_tty_chars_in_buffer(tty) != 0) |
| 2569 | return -EINTR; |
| 2570 | |
| 2571 | return 0; |
| 2572 | |
| 2573 | case TCSBRKP: |
| 2574 | /* support for POSIX tcsendbreak() |
| 2575 | * |
| 2576 | * According to POSIX.1 spec (7.2.2.1.2) breaks should be |
| 2577 | * between 0.25 and 0.5 seconds so we'll ask for something |
| 2578 | * in the middle: 0.375 seconds. |
| 2579 | */ |
| 2580 | rc = tty_check_change(tty); |
| 2581 | if (rc) |
| 2582 | return rc; |
| 2583 | tty_wait_until_sent(tty, 0); |
| 2584 | |
| 2585 | rc = dgrp_send_break(ch, arg ? arg*250 : 250); |
| 2586 | |
| 2587 | if (dgrp_tty_chars_in_buffer(tty) != 0) |
| 2588 | return -EINTR; |
| 2589 | return 0; |
| 2590 | |
| 2591 | case TIOCSBRK: |
| 2592 | rc = tty_check_change(tty); |
| 2593 | if (rc) |
| 2594 | return rc; |
| 2595 | tty_wait_until_sent(tty, 0); |
| 2596 | |
| 2597 | /* |
| 2598 | * RealPort doesn't support turning on a break unconditionally. |
| 2599 | * The RealPort device will stop sending a break automatically |
| 2600 | * after the specified time value that we send in. |
| 2601 | */ |
| 2602 | rc = dgrp_send_break(ch, 250); /* 1/4 second */ |
| 2603 | |
| 2604 | if (dgrp_tty_chars_in_buffer(tty) != 0) |
| 2605 | return -EINTR; |
| 2606 | return 0; |
| 2607 | |
| 2608 | case TIOCCBRK: |
| 2609 | /* |
| 2610 | * RealPort doesn't support turning off a break unconditionally. |
| 2611 | * The RealPort device will stop sending a break automatically |
| 2612 | * after the specified time value that was sent when turning on |
| 2613 | * the break. |
| 2614 | */ |
| 2615 | return 0; |
| 2616 | |
| 2617 | case TIOCGSOFTCAR: |
| 2618 | rc = access_ok(VERIFY_WRITE, (void __user *) arg, |
| 2619 | sizeof(long)); |
| 2620 | if (rc == 0) |
| 2621 | return -EFAULT; |
| 2622 | put_user(C_CLOCAL(tty) ? 1 : 0, (unsigned long __user *) arg); |
| 2623 | return 0; |
| 2624 | |
| 2625 | case TIOCSSOFTCAR: |
| 2626 | get_user(arg, (unsigned long __user *) arg); |
| 2627 | tty->termios.c_cflag = |
| 2628 | ((tty->termios.c_cflag & ~CLOCAL) | |
| 2629 | (arg ? CLOCAL : 0)); |
| 2630 | return 0; |
| 2631 | |
| 2632 | case TIOCMGET: |
| 2633 | rc = access_ok(VERIFY_WRITE, (void __user *) arg, |
| 2634 | sizeof(unsigned int)); |
| 2635 | if (rc == 0) |
| 2636 | return -EFAULT; |
| 2637 | return get_modem_info(ch, (unsigned int *) arg); |
| 2638 | |
| 2639 | case TIOCMBIS: |
| 2640 | case TIOCMBIC: |
| 2641 | case TIOCMSET: |
| 2642 | return set_modem_info(ch, cmd, (unsigned int *) arg); |
| 2643 | |
| 2644 | /* |
| 2645 | * Here are any additional ioctl's that we want to implement |
| 2646 | */ |
| 2647 | |
| 2648 | case TCFLSH: |
| 2649 | /* |
| 2650 | * The linux tty driver doesn't have a flush |
| 2651 | * input routine for the driver, assuming all backed |
| 2652 | * up data is in the line disc. buffers. However, |
| 2653 | * we all know that's not the case. Here, we |
| 2654 | * act on the ioctl, but then lie and say we didn't |
| 2655 | * so the line discipline will process the flush |
| 2656 | * also. |
| 2657 | */ |
| 2658 | rc = tty_check_change(tty); |
| 2659 | if (rc) |
| 2660 | return rc; |
| 2661 | |
| 2662 | switch (arg) { |
| 2663 | case TCIFLUSH: |
| 2664 | case TCIOFLUSH: |
| 2665 | /* only flush input if this is the only open unit */ |
| 2666 | if (!IS_PRINT(MINOR(tty_devnum(tty)))) { |
| 2667 | ch->ch_rout = ch->ch_rin; |
| 2668 | ch->ch_send |= RR_RX_FLUSH; |
| 2669 | (ch->ch_nd)->nd_tx_work = 1; |
| 2670 | (ch->ch_nd)->nd_tx_ready = 1; |
| 2671 | wake_up_interruptible(&(ch->ch_nd)->nd_tx_waitq); |
| 2672 | } |
| 2673 | if (arg == TCIFLUSH) |
| 2674 | break; |
| 2675 | |
| 2676 | case TCOFLUSH: /* flush output, or the receive buffer */ |
| 2677 | /* |
| 2678 | * This is handled in the tty_ioctl.c code |
| 2679 | * calling tty_flush_buffer |
| 2680 | */ |
| 2681 | break; |
| 2682 | |
| 2683 | default: |
| 2684 | /* POSIX.1 says return EINVAL if we got a bad arg */ |
| 2685 | return -EINVAL; |
| 2686 | } |
| 2687 | /* pretend we didn't recognize this IOCTL */ |
| 2688 | return -ENOIOCTLCMD; |
| 2689 | |
| 2690 | #ifdef TIOCGETP |
| 2691 | case TIOCGETP: |
| 2692 | #endif |
| 2693 | /***************************************** |
| 2694 | Linux HPUX Function |
| 2695 | TCSETA TCSETA - set the termios |
| 2696 | TCSETAF TCSETAF - wait for drain first, then set termios |
| 2697 | TCSETAW TCSETAW - wait for drain, flush the input queue, then set termios |
| 2698 | - looking at the tty_ioctl code, these command all call our |
| 2699 | tty_set_termios at the driver's end, when a TCSETA* is sent, |
| 2700 | it is expecting the tty to have a termio structure, |
| 2701 | NOT a termios stucture. These two structures differ in size |
| 2702 | and the tty_ioctl code does a conversion before processing them both. |
| 2703 | - we should treat the TCSETAW TCSETAF ioctls the same, and let |
| 2704 | the tty_ioctl code do the conversion stuff. |
| 2705 | |
| 2706 | TCSETS |
| 2707 | TCSETSF (none) |
| 2708 | TCSETSW |
| 2709 | - the associated tty structure has a termios structure. |
| 2710 | *****************************************/ |
| 2711 | |
| 2712 | case TCGETS: |
| 2713 | case TCGETA: |
| 2714 | return -ENOIOCTLCMD; |
| 2715 | |
| 2716 | case TCSETAW: |
| 2717 | case TCSETAF: |
| 2718 | case TCSETSF: |
| 2719 | case TCSETSW: |
| 2720 | /* |
| 2721 | * The linux tty driver doesn't have a flush |
| 2722 | * input routine for the driver, assuming all backed |
| 2723 | * up data is in the line disc. buffers. However, |
| 2724 | * we all know that's not the case. Here, we |
| 2725 | * act on the ioctl, but then lie and say we didn't |
| 2726 | * so the line discipline will process the flush |
| 2727 | * also. |
| 2728 | */ |
| 2729 | |
| 2730 | /* |
| 2731 | * Also, now that we have TXPrint, we have to check |
| 2732 | * if this is the TXPrint device and the terminal |
| 2733 | * device is open. If so, do NOT run check_change, |
| 2734 | * as the terminal device is ALWAYS the parent. |
| 2735 | */ |
| 2736 | if (!IS_PRINT(MINOR(tty_devnum(tty))) || |
| 2737 | !ch->ch_tun.un_open_count) { |
| 2738 | rc = tty_check_change(tty); |
| 2739 | if (rc) |
| 2740 | return rc; |
| 2741 | } |
| 2742 | |
| 2743 | /* wait for all the characters in tbuf to drain */ |
| 2744 | tty_wait_until_sent(tty, 0); |
| 2745 | |
| 2746 | if ((cmd == TCSETSF) || (cmd == TCSETAF)) { |
| 2747 | /* flush the contents of the rbuf queue */ |
| 2748 | /* TODO: check if this is print device? */ |
| 2749 | ch->ch_send |= RR_RX_FLUSH; |
| 2750 | (ch->ch_nd)->nd_tx_ready = 1; |
| 2751 | (ch->ch_nd)->nd_tx_work = 1; |
| 2752 | wake_up_interruptible(&(ch->ch_nd)->nd_tx_waitq); |
| 2753 | /* do we need to do this? just to be safe! */ |
| 2754 | ch->ch_rout = ch->ch_rin; |
| 2755 | } |
| 2756 | |
| 2757 | /* pretend we didn't recognize this */ |
| 2758 | return -ENOIOCTLCMD; |
| 2759 | |
| 2760 | case TCXONC: |
| 2761 | /* |
| 2762 | * The Linux Line Discipline (LD) would do this for us if we |
| 2763 | * let it, but we have the special firmware options to do this |
| 2764 | * the "right way" regardless of hardware or software flow |
| 2765 | * control so we'll do it outselves instead of letting the LD |
| 2766 | * do it. |
| 2767 | */ |
| 2768 | rc = tty_check_change(tty); |
| 2769 | if (rc) |
| 2770 | return rc; |
| 2771 | |
| 2772 | switch (arg) { |
| 2773 | case TCOON: |
| 2774 | dgrp_tty_start(tty); |
| 2775 | return 0; |
| 2776 | case TCOOFF: |
| 2777 | dgrp_tty_stop(tty); |
| 2778 | return 0; |
| 2779 | case TCION: |
| 2780 | dgrp_tty_input_start(tty); |
| 2781 | return 0; |
| 2782 | case TCIOFF: |
| 2783 | dgrp_tty_input_stop(tty); |
| 2784 | return 0; |
| 2785 | default: |
| 2786 | return -EINVAL; |
| 2787 | } |
| 2788 | |
| 2789 | case DIGI_GETA: |
| 2790 | /* get information for ditty */ |
| 2791 | if (copy_to_user((struct digi_struct __user *) arg, |
| 2792 | &ch->ch_digi, sizeof(struct digi_struct))) |
| 2793 | return -EFAULT; |
| 2794 | break; |
| 2795 | |
| 2796 | case DIGI_SETAW: |
| 2797 | case DIGI_SETAF: |
| 2798 | /* wait for all the characters in tbuf to drain */ |
| 2799 | tty_wait_until_sent(tty, 0); |
| 2800 | |
| 2801 | if (cmd == DIGI_SETAF) { |
| 2802 | /* flush the contents of the rbuf queue */ |
| 2803 | /* send down a packet with RR_RX_FLUSH set */ |
| 2804 | ch->ch_send |= RR_RX_FLUSH; |
| 2805 | (ch->ch_nd)->nd_tx_ready = 1; |
| 2806 | (ch->ch_nd)->nd_tx_work = 1; |
| 2807 | wake_up_interruptible(&(ch->ch_nd)->nd_tx_waitq); |
| 2808 | /* do we need to do this? just to be safe! */ |
| 2809 | ch->ch_rout = ch->ch_rin; |
| 2810 | } |
| 2811 | |
| 2812 | /* pretend we didn't recognize this */ |
| 2813 | |
| 2814 | case DIGI_SETA: |
| 2815 | return dgrp_tty_digiseta(tty, (struct digi_struct *) arg); |
| 2816 | |
| 2817 | case DIGI_SEDELAY: |
| 2818 | return dgrp_tty_digisetedelay(tty, (int *) arg); |
| 2819 | |
| 2820 | case DIGI_GEDELAY: |
| 2821 | return dgrp_tty_digigetedelay(tty, (int *) arg); |
| 2822 | |
| 2823 | case DIGI_GETFLOW: |
| 2824 | case DIGI_GETAFLOW: |
| 2825 | if (cmd == (DIGI_GETFLOW)) { |
| 2826 | dflow.startc = tty->termios.c_cc[VSTART]; |
| 2827 | dflow.stopc = tty->termios.c_cc[VSTOP]; |
| 2828 | } else { |
| 2829 | dflow.startc = ch->ch_xxon; |
| 2830 | dflow.stopc = ch->ch_xxoff; |
| 2831 | } |
| 2832 | |
| 2833 | if (copy_to_user((char __user *)arg, &dflow, sizeof(dflow))) |
| 2834 | return -EFAULT; |
| 2835 | break; |
| 2836 | |
| 2837 | case DIGI_SETFLOW: |
| 2838 | case DIGI_SETAFLOW: |
| 2839 | |
| 2840 | if (copy_from_user(&dflow, (char __user *)arg, sizeof(dflow))) |
| 2841 | return -EFAULT; |
| 2842 | |
| 2843 | if (cmd == (DIGI_SETFLOW)) { |
| 2844 | tty->termios.c_cc[VSTART] = dflow.startc; |
| 2845 | tty->termios.c_cc[VSTOP] = dflow.stopc; |
| 2846 | } else { |
| 2847 | ch->ch_xxon = dflow.startc; |
| 2848 | ch->ch_xxoff = dflow.stopc; |
| 2849 | } |
| 2850 | break; |
| 2851 | |
| 2852 | case DIGI_GETCUSTOMBAUD: |
| 2853 | rc = access_ok(VERIFY_WRITE, (void __user *) arg, sizeof(int)); |
| 2854 | if (rc == 0) |
| 2855 | return -EFAULT; |
| 2856 | put_user(ch->ch_custom_speed, (unsigned int __user *) arg); |
| 2857 | break; |
| 2858 | |
| 2859 | case DIGI_SETCUSTOMBAUD: |
| 2860 | { |
| 2861 | int new_rate; |
| 2862 | |
| 2863 | get_user(new_rate, (unsigned int __user *) arg); |
| 2864 | dgrp_set_custom_speed(ch, new_rate); |
| 2865 | |
| 2866 | break; |
| 2867 | } |
| 2868 | |
| 2869 | default: |
| 2870 | return -ENOIOCTLCMD; |
| 2871 | } |
| 2872 | |
| 2873 | return 0; |
| 2874 | } |
| 2875 | |
| 2876 | /* |
| 2877 | * This routine allows the tty driver to be notified when |
| 2878 | * the device's termios setting have changed. Note that we |
| 2879 | * should be prepared to accept the case where old == NULL |
| 2880 | * and try to do something rational. |
| 2881 | * |
| 2882 | * So we need to make sure that our copies of ch_oflag, |
| 2883 | * ch_clag, and ch_iflag reflect the tty->termios flags. |
| 2884 | */ |
| 2885 | static void dgrp_tty_set_termios(struct tty_struct *tty, struct ktermios *old) |
| 2886 | { |
| 2887 | struct ktermios *ts; |
| 2888 | struct ch_struct *ch; |
| 2889 | struct un_struct *un; |
| 2890 | |
| 2891 | /* seems silly, but we have to check all these! */ |
| 2892 | if (!tty) |
| 2893 | return; |
| 2894 | |
| 2895 | un = tty->driver_data; |
| 2896 | if (!un) |
| 2897 | return; |
| 2898 | |
| 2899 | ts = &tty->termios; |
| 2900 | |
| 2901 | ch = un->un_ch; |
| 2902 | if (!ch) |
| 2903 | return; |
| 2904 | |
| 2905 | drp_param(ch); |
| 2906 | |
| 2907 | /* the CLOCAL flag has just been set */ |
| 2908 | if (!(old->c_cflag & CLOCAL) && C_CLOCAL(tty)) |
| 2909 | wake_up_interruptible(&un->un_open_wait); |
| 2910 | } |
| 2911 | |
| 2912 | |
| 2913 | /* |
| 2914 | * Throttle receiving data. We just set a bit and stop reading |
| 2915 | * data out of the channel buffer. It will back up and the |
| 2916 | * FEP will do whatever is necessary to stop the far end. |
| 2917 | */ |
| 2918 | static void dgrp_tty_throttle(struct tty_struct *tty) |
| 2919 | { |
| 2920 | struct ch_struct *ch; |
| 2921 | |
| 2922 | if (!tty) |
| 2923 | return; |
| 2924 | |
| 2925 | ch = ((struct un_struct *) tty->driver_data)->un_ch; |
| 2926 | if (!ch) |
| 2927 | return; |
| 2928 | |
| 2929 | ch->ch_flag |= CH_RXSTOP; |
| 2930 | } |
| 2931 | |
| 2932 | |
| 2933 | static void dgrp_tty_unthrottle(struct tty_struct *tty) |
| 2934 | { |
| 2935 | struct ch_struct *ch; |
| 2936 | |
| 2937 | if (!tty) |
| 2938 | return; |
| 2939 | |
| 2940 | ch = ((struct un_struct *) tty->driver_data)->un_ch; |
| 2941 | if (!ch) |
| 2942 | return; |
| 2943 | |
| 2944 | ch->ch_flag &= ~CH_RXSTOP; |
| 2945 | } |
| 2946 | |
| 2947 | /* |
| 2948 | * Stop the transmitter |
| 2949 | */ |
| 2950 | static void dgrp_tty_stop(struct tty_struct *tty) |
| 2951 | { |
| 2952 | struct ch_struct *ch; |
| 2953 | |
| 2954 | if (!tty) |
| 2955 | return; |
| 2956 | |
| 2957 | ch = ((struct un_struct *) tty->driver_data)->un_ch; |
| 2958 | if (!ch) |
| 2959 | return; |
| 2960 | |
| 2961 | ch->ch_send |= RR_TX_STOP; |
| 2962 | ch->ch_send &= ~RR_TX_START; |
| 2963 | |
| 2964 | /* make the change NOW! */ |
| 2965 | (ch->ch_nd)->nd_tx_ready = 1; |
| 2966 | if (waitqueue_active(&(ch->ch_nd)->nd_tx_waitq)) |
| 2967 | wake_up_interruptible(&(ch->ch_nd)->nd_tx_waitq); |
| 2968 | } |
| 2969 | |
| 2970 | /* |
| 2971 | * Start the transmitter |
| 2972 | */ |
| 2973 | static void dgrp_tty_start(struct tty_struct *tty) |
| 2974 | { |
| 2975 | struct ch_struct *ch; |
| 2976 | |
| 2977 | if (!tty) |
| 2978 | return; |
| 2979 | |
| 2980 | ch = ((struct un_struct *) tty->driver_data)->un_ch; |
| 2981 | if (!ch) |
| 2982 | return; |
| 2983 | |
| 2984 | /* TODO: don't do anything if the transmitter is not stopped */ |
| 2985 | |
| 2986 | ch->ch_send |= RR_TX_START; |
| 2987 | ch->ch_send &= ~RR_TX_STOP; |
| 2988 | |
| 2989 | /* make the change NOW! */ |
| 2990 | (ch->ch_nd)->nd_tx_ready = 1; |
| 2991 | (ch->ch_nd)->nd_tx_work = 1; |
| 2992 | if (waitqueue_active(&(ch->ch_nd)->nd_tx_waitq)) |
| 2993 | wake_up_interruptible(&(ch->ch_nd)->nd_tx_waitq); |
| 2994 | |
| 2995 | } |
| 2996 | |
| 2997 | /* |
| 2998 | * Stop the reciever |
| 2999 | */ |
| 3000 | static void dgrp_tty_input_stop(struct tty_struct *tty) |
| 3001 | { |
| 3002 | struct ch_struct *ch; |
| 3003 | |
| 3004 | if (!tty) |
| 3005 | return; |
| 3006 | |
| 3007 | ch = ((struct un_struct *) tty->driver_data)->un_ch; |
| 3008 | if (!ch) |
| 3009 | return; |
| 3010 | |
| 3011 | ch->ch_send |= RR_RX_STOP; |
| 3012 | ch->ch_send &= ~RR_RX_START; |
| 3013 | (ch->ch_nd)->nd_tx_ready = 1; |
| 3014 | if (waitqueue_active(&(ch->ch_nd)->nd_tx_waitq)) |
| 3015 | wake_up_interruptible(&(ch->ch_nd)->nd_tx_waitq); |
| 3016 | |
| 3017 | } |
| 3018 | |
| 3019 | |
| 3020 | static void dgrp_tty_send_xchar(struct tty_struct *tty, char c) |
| 3021 | { |
| 3022 | struct un_struct *un; |
| 3023 | struct ch_struct *ch; |
| 3024 | |
| 3025 | if (!tty) |
| 3026 | return; |
| 3027 | |
| 3028 | un = tty->driver_data; |
| 3029 | if (!un) |
| 3030 | return; |
| 3031 | |
| 3032 | ch = un->un_ch; |
| 3033 | if (!ch) |
| 3034 | return; |
| 3035 | if (c == STOP_CHAR(tty)) |
| 3036 | ch->ch_send |= RR_RX_STOP; |
| 3037 | else if (c == START_CHAR(tty)) |
| 3038 | ch->ch_send |= RR_RX_START; |
| 3039 | |
| 3040 | ch->ch_nd->nd_tx_ready = 1; |
| 3041 | ch->ch_nd->nd_tx_work = 1; |
| 3042 | |
| 3043 | return; |
| 3044 | } |
| 3045 | |
| 3046 | |
| 3047 | static void dgrp_tty_input_start(struct tty_struct *tty) |
| 3048 | { |
| 3049 | struct ch_struct *ch; |
| 3050 | |
| 3051 | if (!tty) |
| 3052 | return; |
| 3053 | |
| 3054 | ch = ((struct un_struct *) tty->driver_data)->un_ch; |
| 3055 | if (!ch) |
| 3056 | return; |
| 3057 | |
| 3058 | ch->ch_send |= RR_RX_START; |
| 3059 | ch->ch_send &= ~RR_RX_STOP; |
| 3060 | (ch->ch_nd)->nd_tx_ready = 1; |
| 3061 | (ch->ch_nd)->nd_tx_work = 1; |
| 3062 | if (waitqueue_active(&(ch->ch_nd)->nd_tx_waitq)) |
| 3063 | wake_up_interruptible(&(ch->ch_nd)->nd_tx_waitq); |
| 3064 | |
| 3065 | } |
| 3066 | |
| 3067 | |
| 3068 | /* |
| 3069 | * Hangup the port. Like a close, but don't wait for output |
| 3070 | * to drain. |
| 3071 | * |
| 3072 | * How do we close all the channels that are open? |
| 3073 | */ |
| 3074 | static void dgrp_tty_hangup(struct tty_struct *tty) |
| 3075 | { |
| 3076 | struct ch_struct *ch; |
| 3077 | struct nd_struct *nd; |
| 3078 | struct un_struct *un; |
| 3079 | |
| 3080 | if (!tty) |
| 3081 | return; |
| 3082 | |
| 3083 | un = tty->driver_data; |
| 3084 | if (!un) |
| 3085 | return; |
| 3086 | |
| 3087 | ch = un->un_ch; |
| 3088 | if (!ch) |
| 3089 | return; |
| 3090 | |
| 3091 | nd = ch->ch_nd; |
| 3092 | |
| 3093 | if (C_HUPCL(tty)) { |
| 3094 | /* LOWER DTR */ |
| 3095 | ch->ch_mout &= ~DM_DTR; |
| 3096 | /* Don't do this here */ |
| 3097 | /* ch->ch_flag |= CH_HANGUP; */ |
| 3098 | ch->ch_nd->nd_tx_ready = 1; |
| 3099 | ch->ch_nd->nd_tx_work = 1; |
| 3100 | if (waitqueue_active(&ch->ch_flag_wait)) |
| 3101 | wake_up_interruptible(&ch->ch_flag_wait); |
| 3102 | } |
| 3103 | |
| 3104 | } |
| 3105 | |
| 3106 | /************************************************************************/ |
| 3107 | /* */ |
| 3108 | /* TTY Initialization/Cleanup Functions */ |
| 3109 | /* */ |
| 3110 | /************************************************************************/ |
| 3111 | |
| 3112 | /* |
| 3113 | * Uninitialize the TTY portion of the supplied node. Free all |
| 3114 | * memory and resources associated with this node. Do it in reverse |
| 3115 | * allocation order: this might possibly result in less fragmentation |
| 3116 | * of memory, though I don't know this for sure. |
| 3117 | */ |
| 3118 | void |
| 3119 | dgrp_tty_uninit(struct nd_struct *nd) |
| 3120 | { |
| 3121 | char id[3]; |
| 3122 | |
| 3123 | ID_TO_CHAR(nd->nd_ID, id); |
| 3124 | |
| 3125 | if (nd->nd_ttdriver_flags & SERIAL_TTDRV_REG) { |
| 3126 | tty_unregister_driver(nd->nd_serial_ttdriver); |
| 3127 | |
| 3128 | kfree(nd->nd_serial_ttdriver->ttys); |
| 3129 | nd->nd_serial_ttdriver->ttys = NULL; |
| 3130 | |
| 3131 | put_tty_driver(nd->nd_serial_ttdriver); |
| 3132 | nd->nd_ttdriver_flags &= ~SERIAL_TTDRV_REG; |
| 3133 | } |
| 3134 | |
| 3135 | if (nd->nd_ttdriver_flags & CALLOUT_TTDRV_REG) { |
| 3136 | tty_unregister_driver(nd->nd_callout_ttdriver); |
| 3137 | |
| 3138 | kfree(nd->nd_callout_ttdriver->ttys); |
| 3139 | nd->nd_callout_ttdriver->ttys = NULL; |
| 3140 | |
| 3141 | put_tty_driver(nd->nd_callout_ttdriver); |
| 3142 | nd->nd_ttdriver_flags &= ~CALLOUT_TTDRV_REG; |
| 3143 | } |
| 3144 | |
| 3145 | if (nd->nd_ttdriver_flags & XPRINT_TTDRV_REG) { |
| 3146 | tty_unregister_driver(nd->nd_xprint_ttdriver); |
| 3147 | |
| 3148 | kfree(nd->nd_xprint_ttdriver->ttys); |
| 3149 | nd->nd_xprint_ttdriver->ttys = NULL; |
| 3150 | |
| 3151 | put_tty_driver(nd->nd_xprint_ttdriver); |
| 3152 | nd->nd_ttdriver_flags &= ~XPRINT_TTDRV_REG; |
| 3153 | } |
| 3154 | } |
| 3155 | |
| 3156 | |
| 3157 | |
| 3158 | /* |
| 3159 | * Initialize the TTY portion of the supplied node. |
| 3160 | */ |
| 3161 | int |
| 3162 | dgrp_tty_init(struct nd_struct *nd) |
| 3163 | { |
| 3164 | char id[3]; |
| 3165 | int rc; |
| 3166 | int i; |
| 3167 | |
| 3168 | ID_TO_CHAR(nd->nd_ID, id); |
| 3169 | |
| 3170 | /* |
| 3171 | * Initialize the TTDRIVER structures. |
| 3172 | */ |
| 3173 | |
| 3174 | nd->nd_serial_ttdriver = alloc_tty_driver(CHAN_MAX); |
| 3175 | sprintf(nd->nd_serial_name, "tty_dgrp_%s_", id); |
| 3176 | |
| 3177 | nd->nd_serial_ttdriver->owner = THIS_MODULE; |
| 3178 | nd->nd_serial_ttdriver->name = nd->nd_serial_name; |
| 3179 | nd->nd_serial_ttdriver->name_base = 0; |
| 3180 | nd->nd_serial_ttdriver->major = 0; |
| 3181 | nd->nd_serial_ttdriver->minor_start = 0; |
| 3182 | nd->nd_serial_ttdriver->type = TTY_DRIVER_TYPE_SERIAL; |
| 3183 | nd->nd_serial_ttdriver->subtype = SERIAL_TYPE_NORMAL; |
| 3184 | nd->nd_serial_ttdriver->init_termios = DefaultTermios; |
| 3185 | nd->nd_serial_ttdriver->driver_name = "dgrp"; |
| 3186 | nd->nd_serial_ttdriver->flags = (TTY_DRIVER_REAL_RAW | |
| 3187 | TTY_DRIVER_DYNAMIC_DEV | |
| 3188 | TTY_DRIVER_HARDWARE_BREAK); |
| 3189 | |
| 3190 | /* The kernel wants space to store pointers to tty_structs. */ |
| 3191 | nd->nd_serial_ttdriver->ttys = |
| 3192 | kzalloc(CHAN_MAX * sizeof(struct tty_struct *), GFP_KERNEL); |
| 3193 | if (!nd->nd_serial_ttdriver->ttys) |
| 3194 | return -ENOMEM; |
| 3195 | |
| 3196 | tty_set_operations(nd->nd_serial_ttdriver, &dgrp_tty_ops); |
| 3197 | |
| 3198 | if (!(nd->nd_ttdriver_flags & SERIAL_TTDRV_REG)) { |
| 3199 | /* |
| 3200 | * Register tty devices |
| 3201 | */ |
| 3202 | rc = tty_register_driver(nd->nd_serial_ttdriver); |
| 3203 | if (rc < 0) { |
| 3204 | /* |
| 3205 | * If errno is EBUSY, this means there are no more |
| 3206 | * slots available to have us auto-majored. |
| 3207 | * (Which is currently supported up to 256) |
| 3208 | * |
| 3209 | * We can still request majors above 256, |
| 3210 | * we just have to do it manually. |
| 3211 | */ |
| 3212 | if (rc == -EBUSY) { |
| 3213 | int i; |
| 3214 | int max_majors = 1U << (32 - MINORBITS); |
| 3215 | for (i = 256; i < max_majors; i++) { |
| 3216 | nd->nd_serial_ttdriver->major = i; |
| 3217 | rc = tty_register_driver(nd->nd_serial_ttdriver); |
| 3218 | if (rc >= 0) |
| 3219 | break; |
| 3220 | } |
| 3221 | /* Really fail now, since we ran out |
| 3222 | * of majors to try. */ |
| 3223 | if (i == max_majors) |
| 3224 | return rc; |
| 3225 | |
| 3226 | } else { |
| 3227 | return rc; |
| 3228 | } |
| 3229 | } |
| 3230 | nd->nd_ttdriver_flags |= SERIAL_TTDRV_REG; |
| 3231 | } |
| 3232 | |
| 3233 | nd->nd_callout_ttdriver = alloc_tty_driver(CHAN_MAX); |
| 3234 | sprintf(nd->nd_callout_name, "cu_dgrp_%s_", id); |
| 3235 | |
| 3236 | nd->nd_callout_ttdriver->owner = THIS_MODULE; |
| 3237 | nd->nd_callout_ttdriver->name = nd->nd_callout_name; |
| 3238 | nd->nd_callout_ttdriver->name_base = 0; |
| 3239 | nd->nd_callout_ttdriver->major = nd->nd_serial_ttdriver->major; |
| 3240 | nd->nd_callout_ttdriver->minor_start = 0x40; |
| 3241 | nd->nd_callout_ttdriver->type = TTY_DRIVER_TYPE_SERIAL; |
| 3242 | nd->nd_callout_ttdriver->subtype = SERIAL_TYPE_CALLOUT; |
| 3243 | nd->nd_callout_ttdriver->init_termios = DefaultTermios; |
| 3244 | nd->nd_callout_ttdriver->driver_name = "dgrp"; |
| 3245 | nd->nd_callout_ttdriver->flags = (TTY_DRIVER_REAL_RAW | |
| 3246 | TTY_DRIVER_DYNAMIC_DEV | |
| 3247 | TTY_DRIVER_HARDWARE_BREAK); |
| 3248 | |
| 3249 | /* The kernel wants space to store pointers to tty_structs. */ |
| 3250 | nd->nd_callout_ttdriver->ttys = |
| 3251 | kzalloc(CHAN_MAX * sizeof(struct tty_struct *), GFP_KERNEL); |
| 3252 | if (!nd->nd_callout_ttdriver->ttys) |
| 3253 | return -ENOMEM; |
| 3254 | |
| 3255 | tty_set_operations(nd->nd_callout_ttdriver, &dgrp_tty_ops); |
| 3256 | |
| 3257 | if (dgrp_register_cudevices) { |
| 3258 | if (!(nd->nd_ttdriver_flags & CALLOUT_TTDRV_REG)) { |
| 3259 | /* |
| 3260 | * Register cu devices |
| 3261 | */ |
| 3262 | rc = tty_register_driver(nd->nd_callout_ttdriver); |
| 3263 | if (rc < 0) |
| 3264 | return rc; |
| 3265 | nd->nd_ttdriver_flags |= CALLOUT_TTDRV_REG; |
| 3266 | } |
| 3267 | } |
| 3268 | |
| 3269 | |
| 3270 | nd->nd_xprint_ttdriver = alloc_tty_driver(CHAN_MAX); |
| 3271 | sprintf(nd->nd_xprint_name, "pr_dgrp_%s_", id); |
| 3272 | |
| 3273 | nd->nd_xprint_ttdriver->owner = THIS_MODULE; |
| 3274 | nd->nd_xprint_ttdriver->name = nd->nd_xprint_name; |
| 3275 | nd->nd_xprint_ttdriver->name_base = 0; |
| 3276 | nd->nd_xprint_ttdriver->major = nd->nd_serial_ttdriver->major; |
| 3277 | nd->nd_xprint_ttdriver->minor_start = 0x80; |
| 3278 | nd->nd_xprint_ttdriver->type = TTY_DRIVER_TYPE_SERIAL; |
| 3279 | nd->nd_xprint_ttdriver->subtype = SERIAL_TYPE_XPRINT; |
| 3280 | nd->nd_xprint_ttdriver->init_termios = DefaultTermios; |
| 3281 | nd->nd_xprint_ttdriver->driver_name = "dgrp"; |
| 3282 | nd->nd_xprint_ttdriver->flags = (TTY_DRIVER_REAL_RAW | |
| 3283 | TTY_DRIVER_DYNAMIC_DEV | |
| 3284 | TTY_DRIVER_HARDWARE_BREAK); |
| 3285 | |
| 3286 | /* The kernel wants space to store pointers to tty_structs. */ |
| 3287 | nd->nd_xprint_ttdriver->ttys = |
| 3288 | kzalloc(CHAN_MAX * sizeof(struct tty_struct *), GFP_KERNEL); |
| 3289 | if (!nd->nd_xprint_ttdriver->ttys) |
| 3290 | return -ENOMEM; |
| 3291 | |
| 3292 | tty_set_operations(nd->nd_xprint_ttdriver, &dgrp_tty_ops); |
| 3293 | |
| 3294 | if (dgrp_register_prdevices) { |
| 3295 | if (!(nd->nd_ttdriver_flags & XPRINT_TTDRV_REG)) { |
| 3296 | /* |
| 3297 | * Register transparent print devices |
| 3298 | */ |
| 3299 | rc = tty_register_driver(nd->nd_xprint_ttdriver); |
| 3300 | if (rc < 0) |
| 3301 | return rc; |
| 3302 | nd->nd_ttdriver_flags |= XPRINT_TTDRV_REG; |
| 3303 | } |
| 3304 | } |
| 3305 | |
| 3306 | for (i = 0; i < CHAN_MAX; i++) { |
| 3307 | struct ch_struct *ch = nd->nd_chan + i; |
| 3308 | |
| 3309 | ch->ch_nd = nd; |
| 3310 | ch->ch_digi = digi_init; |
| 3311 | ch->ch_edelay = 100; |
| 3312 | ch->ch_custom_speed = 0; |
| 3313 | ch->ch_portnum = i; |
| 3314 | ch->ch_tun.un_ch = ch; |
| 3315 | ch->ch_pun.un_ch = ch; |
| 3316 | ch->ch_tun.un_type = SERIAL_TYPE_NORMAL; |
| 3317 | ch->ch_pun.un_type = SERIAL_TYPE_XPRINT; |
| 3318 | |
| 3319 | init_waitqueue_head(&(ch->ch_flag_wait)); |
| 3320 | init_waitqueue_head(&(ch->ch_sleep)); |
| 3321 | |
| 3322 | init_waitqueue_head(&(ch->ch_tun.un_open_wait)); |
| 3323 | init_waitqueue_head(&(ch->ch_tun.un_close_wait)); |
| 3324 | |
| 3325 | init_waitqueue_head(&(ch->ch_pun.un_open_wait)); |
| 3326 | init_waitqueue_head(&(ch->ch_pun.un_close_wait)); |
| 3327 | tty_port_init(&ch->port); |
| 3328 | tty_port_init(&ch->port); |
| 3329 | } |
| 3330 | return 0; |
| 3331 | } |