David Sterba | 099dc4f | 2008-02-07 10:57:12 +0100 | [diff] [blame] | 1 | /* |
| 2 | * IPWireless 3G PCMCIA Network Driver |
| 3 | * |
| 4 | * Original code |
| 5 | * by Stephen Blackheath <stephen@blacksapphire.com>, |
| 6 | * Ben Martel <benm@symmetric.co.nz> |
| 7 | * |
| 8 | * Copyrighted as follows: |
| 9 | * Copyright (C) 2004 by Symmetric Systems Ltd (NZ) |
| 10 | * |
| 11 | * Various driver changes and rewrites, port to new kernels |
| 12 | * Copyright (C) 2006-2007 Jiri Kosina |
| 13 | * |
| 14 | * Misc code cleanups and updates |
| 15 | * Copyright (C) 2007 David Sterba |
| 16 | */ |
| 17 | |
| 18 | #include <linux/init.h> |
| 19 | #include <linux/kernel.h> |
| 20 | #include <linux/module.h> |
| 21 | #include <linux/mutex.h> |
| 22 | #include <linux/ppp_defs.h> |
| 23 | #include <linux/if.h> |
| 24 | #include <linux/if_ppp.h> |
| 25 | #include <linux/sched.h> |
| 26 | #include <linux/serial.h> |
| 27 | #include <linux/slab.h> |
| 28 | #include <linux/tty.h> |
| 29 | #include <linux/tty_driver.h> |
| 30 | #include <linux/tty_flip.h> |
| 31 | #include <linux/uaccess.h> |
David Sterba | 099dc4f | 2008-02-07 10:57:12 +0100 | [diff] [blame] | 32 | |
| 33 | #include "tty.h" |
| 34 | #include "network.h" |
| 35 | #include "hardware.h" |
| 36 | #include "main.h" |
| 37 | |
| 38 | #define IPWIRELESS_PCMCIA_START (0) |
| 39 | #define IPWIRELESS_PCMCIA_MINORS (24) |
| 40 | #define IPWIRELESS_PCMCIA_MINOR_RANGE (8) |
| 41 | |
| 42 | #define TTYTYPE_MODEM (0) |
| 43 | #define TTYTYPE_MONITOR (1) |
| 44 | #define TTYTYPE_RAS_RAW (2) |
| 45 | |
| 46 | struct ipw_tty { |
| 47 | int index; |
| 48 | struct ipw_hardware *hardware; |
| 49 | unsigned int channel_idx; |
| 50 | unsigned int secondary_channel_idx; |
| 51 | int tty_type; |
| 52 | struct ipw_network *network; |
| 53 | struct tty_struct *linux_tty; |
| 54 | int open_count; |
| 55 | unsigned int control_lines; |
| 56 | struct mutex ipw_tty_mutex; |
| 57 | int tx_bytes_queued; |
| 58 | int closing; |
| 59 | }; |
| 60 | |
| 61 | static struct ipw_tty *ttys[IPWIRELESS_PCMCIA_MINORS]; |
| 62 | |
| 63 | static struct tty_driver *ipw_tty_driver; |
| 64 | |
| 65 | static char *tty_type_name(int tty_type) |
| 66 | { |
| 67 | static char *channel_names[] = { |
| 68 | "modem", |
| 69 | "monitor", |
| 70 | "RAS-raw" |
| 71 | }; |
| 72 | |
| 73 | return channel_names[tty_type]; |
| 74 | } |
| 75 | |
| 76 | static void report_registering(struct ipw_tty *tty) |
| 77 | { |
| 78 | char *iftype = tty_type_name(tty->tty_type); |
| 79 | |
| 80 | printk(KERN_INFO IPWIRELESS_PCCARD_NAME |
| 81 | ": registering %s device ttyIPWp%d\n", iftype, tty->index); |
| 82 | } |
| 83 | |
| 84 | static void report_deregistering(struct ipw_tty *tty) |
| 85 | { |
| 86 | char *iftype = tty_type_name(tty->tty_type); |
| 87 | |
| 88 | printk(KERN_INFO IPWIRELESS_PCCARD_NAME |
| 89 | ": deregistering %s device ttyIPWp%d\n", iftype, |
| 90 | tty->index); |
| 91 | } |
| 92 | |
| 93 | static struct ipw_tty *get_tty(int minor) |
| 94 | { |
| 95 | if (minor < ipw_tty_driver->minor_start |
| 96 | || minor >= ipw_tty_driver->minor_start + |
| 97 | IPWIRELESS_PCMCIA_MINORS) |
| 98 | return NULL; |
| 99 | else { |
| 100 | int minor_offset = minor - ipw_tty_driver->minor_start; |
| 101 | |
| 102 | /* |
| 103 | * The 'ras_raw' channel is only available when 'loopback' mode |
| 104 | * is enabled. |
| 105 | * Number of minor starts with 16 (_RANGE * _RAS_RAW). |
| 106 | */ |
| 107 | if (!ipwireless_loopback && |
| 108 | minor_offset >= |
| 109 | IPWIRELESS_PCMCIA_MINOR_RANGE * TTYTYPE_RAS_RAW) |
| 110 | return NULL; |
| 111 | |
| 112 | return ttys[minor_offset]; |
| 113 | } |
| 114 | } |
| 115 | |
| 116 | static int ipw_open(struct tty_struct *linux_tty, struct file *filp) |
| 117 | { |
| 118 | int minor = linux_tty->index; |
| 119 | struct ipw_tty *tty = get_tty(minor); |
| 120 | |
| 121 | if (!tty) |
| 122 | return -ENODEV; |
| 123 | |
| 124 | mutex_lock(&tty->ipw_tty_mutex); |
| 125 | |
| 126 | if (tty->closing) { |
| 127 | mutex_unlock(&tty->ipw_tty_mutex); |
| 128 | return -ENODEV; |
| 129 | } |
| 130 | if (tty->open_count == 0) |
| 131 | tty->tx_bytes_queued = 0; |
| 132 | |
| 133 | tty->open_count++; |
| 134 | |
| 135 | tty->linux_tty = linux_tty; |
| 136 | linux_tty->driver_data = tty; |
| 137 | linux_tty->low_latency = 1; |
| 138 | |
| 139 | if (tty->tty_type == TTYTYPE_MODEM) |
| 140 | ipwireless_ppp_open(tty->network); |
| 141 | |
| 142 | mutex_unlock(&tty->ipw_tty_mutex); |
| 143 | |
| 144 | return 0; |
| 145 | } |
| 146 | |
| 147 | static void do_ipw_close(struct ipw_tty *tty) |
| 148 | { |
| 149 | tty->open_count--; |
| 150 | |
| 151 | if (tty->open_count == 0) { |
| 152 | struct tty_struct *linux_tty = tty->linux_tty; |
| 153 | |
| 154 | if (linux_tty != NULL) { |
| 155 | tty->linux_tty = NULL; |
| 156 | linux_tty->driver_data = NULL; |
| 157 | |
| 158 | if (tty->tty_type == TTYTYPE_MODEM) |
| 159 | ipwireless_ppp_close(tty->network); |
| 160 | } |
| 161 | } |
| 162 | } |
| 163 | |
| 164 | static void ipw_hangup(struct tty_struct *linux_tty) |
| 165 | { |
| 166 | struct ipw_tty *tty = linux_tty->driver_data; |
| 167 | |
| 168 | if (!tty) |
| 169 | return; |
| 170 | |
| 171 | mutex_lock(&tty->ipw_tty_mutex); |
| 172 | if (tty->open_count == 0) { |
| 173 | mutex_unlock(&tty->ipw_tty_mutex); |
| 174 | return; |
| 175 | } |
| 176 | |
| 177 | do_ipw_close(tty); |
| 178 | |
| 179 | mutex_unlock(&tty->ipw_tty_mutex); |
| 180 | } |
| 181 | |
| 182 | static void ipw_close(struct tty_struct *linux_tty, struct file *filp) |
| 183 | { |
| 184 | ipw_hangup(linux_tty); |
| 185 | } |
| 186 | |
| 187 | /* Take data received from hardware, and send it out the tty */ |
| 188 | void ipwireless_tty_received(struct ipw_tty *tty, unsigned char *data, |
| 189 | unsigned int length) |
| 190 | { |
| 191 | struct tty_struct *linux_tty; |
| 192 | int work = 0; |
| 193 | |
| 194 | mutex_lock(&tty->ipw_tty_mutex); |
| 195 | linux_tty = tty->linux_tty; |
| 196 | if (linux_tty == NULL) { |
| 197 | mutex_unlock(&tty->ipw_tty_mutex); |
| 198 | return; |
| 199 | } |
| 200 | |
| 201 | if (!tty->open_count) { |
| 202 | mutex_unlock(&tty->ipw_tty_mutex); |
| 203 | return; |
| 204 | } |
| 205 | mutex_unlock(&tty->ipw_tty_mutex); |
| 206 | |
| 207 | work = tty_insert_flip_string(linux_tty, data, length); |
| 208 | |
| 209 | if (work != length) |
| 210 | printk(KERN_DEBUG IPWIRELESS_PCCARD_NAME |
| 211 | ": %d chars not inserted to flip buffer!\n", |
| 212 | length - work); |
| 213 | |
| 214 | /* |
| 215 | * This may sleep if ->low_latency is set |
| 216 | */ |
| 217 | if (work) |
| 218 | tty_flip_buffer_push(linux_tty); |
| 219 | } |
| 220 | |
| 221 | static void ipw_write_packet_sent_callback(void *callback_data, |
| 222 | unsigned int packet_length) |
| 223 | { |
| 224 | struct ipw_tty *tty = callback_data; |
| 225 | |
| 226 | /* |
| 227 | * Packet has been sent, so we subtract the number of bytes from our |
| 228 | * tally of outstanding TX bytes. |
| 229 | */ |
| 230 | tty->tx_bytes_queued -= packet_length; |
| 231 | } |
| 232 | |
| 233 | static int ipw_write(struct tty_struct *linux_tty, |
| 234 | const unsigned char *buf, int count) |
| 235 | { |
| 236 | struct ipw_tty *tty = linux_tty->driver_data; |
| 237 | int room, ret; |
| 238 | |
| 239 | if (!tty) |
| 240 | return -ENODEV; |
| 241 | |
| 242 | mutex_lock(&tty->ipw_tty_mutex); |
| 243 | if (!tty->open_count) { |
| 244 | mutex_unlock(&tty->ipw_tty_mutex); |
| 245 | return -EINVAL; |
| 246 | } |
| 247 | |
| 248 | room = IPWIRELESS_TX_QUEUE_SIZE - tty->tx_bytes_queued; |
| 249 | if (room < 0) |
| 250 | room = 0; |
| 251 | /* Don't allow caller to write any more than we have room for */ |
| 252 | if (count > room) |
| 253 | count = room; |
| 254 | |
| 255 | if (count == 0) { |
| 256 | mutex_unlock(&tty->ipw_tty_mutex); |
| 257 | return 0; |
| 258 | } |
| 259 | |
| 260 | ret = ipwireless_send_packet(tty->hardware, IPW_CHANNEL_RAS, |
David Sterba | ff3e990 | 2008-07-28 16:53:11 +0200 | [diff] [blame] | 261 | buf, count, |
David Sterba | 099dc4f | 2008-02-07 10:57:12 +0100 | [diff] [blame] | 262 | ipw_write_packet_sent_callback, tty); |
| 263 | if (ret == -1) { |
| 264 | mutex_unlock(&tty->ipw_tty_mutex); |
| 265 | return 0; |
| 266 | } |
| 267 | |
| 268 | tty->tx_bytes_queued += count; |
| 269 | mutex_unlock(&tty->ipw_tty_mutex); |
| 270 | |
| 271 | return count; |
| 272 | } |
| 273 | |
| 274 | static int ipw_write_room(struct tty_struct *linux_tty) |
| 275 | { |
| 276 | struct ipw_tty *tty = linux_tty->driver_data; |
| 277 | int room; |
| 278 | |
Alan Cox | 5aaa70a | 2008-10-13 10:38:07 +0100 | [diff] [blame] | 279 | /* FIXME: Exactly how is the tty object locked here .. */ |
David Sterba | 099dc4f | 2008-02-07 10:57:12 +0100 | [diff] [blame] | 280 | if (!tty) |
| 281 | return -ENODEV; |
| 282 | |
| 283 | if (!tty->open_count) |
| 284 | return -EINVAL; |
| 285 | |
| 286 | room = IPWIRELESS_TX_QUEUE_SIZE - tty->tx_bytes_queued; |
| 287 | if (room < 0) |
| 288 | room = 0; |
| 289 | |
| 290 | return room; |
| 291 | } |
| 292 | |
| 293 | static int ipwireless_get_serial_info(struct ipw_tty *tty, |
| 294 | struct serial_struct __user *retinfo) |
| 295 | { |
| 296 | struct serial_struct tmp; |
| 297 | |
| 298 | if (!retinfo) |
| 299 | return (-EFAULT); |
| 300 | |
| 301 | memset(&tmp, 0, sizeof(tmp)); |
| 302 | tmp.type = PORT_UNKNOWN; |
| 303 | tmp.line = tty->index; |
| 304 | tmp.port = 0; |
| 305 | tmp.irq = 0; |
| 306 | tmp.flags = 0; |
| 307 | tmp.baud_base = 115200; |
| 308 | tmp.close_delay = 0; |
| 309 | tmp.closing_wait = 0; |
| 310 | tmp.custom_divisor = 0; |
| 311 | tmp.hub6 = 0; |
| 312 | if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) |
| 313 | return -EFAULT; |
| 314 | |
| 315 | return 0; |
| 316 | } |
| 317 | |
| 318 | static int ipw_chars_in_buffer(struct tty_struct *linux_tty) |
| 319 | { |
| 320 | struct ipw_tty *tty = linux_tty->driver_data; |
| 321 | |
| 322 | if (!tty) |
| 323 | return -ENODEV; |
| 324 | |
| 325 | if (!tty->open_count) |
| 326 | return -EINVAL; |
| 327 | |
| 328 | return tty->tx_bytes_queued; |
| 329 | } |
| 330 | |
| 331 | static int get_control_lines(struct ipw_tty *tty) |
| 332 | { |
| 333 | unsigned int my = tty->control_lines; |
| 334 | unsigned int out = 0; |
| 335 | |
| 336 | if (my & IPW_CONTROL_LINE_RTS) |
| 337 | out |= TIOCM_RTS; |
| 338 | if (my & IPW_CONTROL_LINE_DTR) |
| 339 | out |= TIOCM_DTR; |
| 340 | if (my & IPW_CONTROL_LINE_CTS) |
| 341 | out |= TIOCM_CTS; |
| 342 | if (my & IPW_CONTROL_LINE_DSR) |
| 343 | out |= TIOCM_DSR; |
| 344 | if (my & IPW_CONTROL_LINE_DCD) |
| 345 | out |= TIOCM_CD; |
| 346 | |
| 347 | return out; |
| 348 | } |
| 349 | |
| 350 | static int set_control_lines(struct ipw_tty *tty, unsigned int set, |
| 351 | unsigned int clear) |
| 352 | { |
| 353 | int ret; |
| 354 | |
| 355 | if (set & TIOCM_RTS) { |
| 356 | ret = ipwireless_set_RTS(tty->hardware, tty->channel_idx, 1); |
| 357 | if (ret) |
| 358 | return ret; |
| 359 | if (tty->secondary_channel_idx != -1) { |
| 360 | ret = ipwireless_set_RTS(tty->hardware, |
| 361 | tty->secondary_channel_idx, 1); |
| 362 | if (ret) |
| 363 | return ret; |
| 364 | } |
| 365 | } |
| 366 | if (set & TIOCM_DTR) { |
| 367 | ret = ipwireless_set_DTR(tty->hardware, tty->channel_idx, 1); |
| 368 | if (ret) |
| 369 | return ret; |
| 370 | if (tty->secondary_channel_idx != -1) { |
| 371 | ret = ipwireless_set_DTR(tty->hardware, |
| 372 | tty->secondary_channel_idx, 1); |
| 373 | if (ret) |
| 374 | return ret; |
| 375 | } |
| 376 | } |
| 377 | if (clear & TIOCM_RTS) { |
| 378 | ret = ipwireless_set_RTS(tty->hardware, tty->channel_idx, 0); |
| 379 | if (tty->secondary_channel_idx != -1) { |
| 380 | ret = ipwireless_set_RTS(tty->hardware, |
| 381 | tty->secondary_channel_idx, 0); |
| 382 | if (ret) |
| 383 | return ret; |
| 384 | } |
| 385 | } |
| 386 | if (clear & TIOCM_DTR) { |
| 387 | ret = ipwireless_set_DTR(tty->hardware, tty->channel_idx, 0); |
| 388 | if (tty->secondary_channel_idx != -1) { |
| 389 | ret = ipwireless_set_DTR(tty->hardware, |
| 390 | tty->secondary_channel_idx, 0); |
| 391 | if (ret) |
| 392 | return ret; |
| 393 | } |
| 394 | } |
| 395 | return 0; |
| 396 | } |
| 397 | |
| 398 | static int ipw_tiocmget(struct tty_struct *linux_tty, struct file *file) |
| 399 | { |
| 400 | struct ipw_tty *tty = linux_tty->driver_data; |
Alan Cox | 5aaa70a | 2008-10-13 10:38:07 +0100 | [diff] [blame] | 401 | /* FIXME: Exactly how is the tty object locked here .. */ |
David Sterba | 099dc4f | 2008-02-07 10:57:12 +0100 | [diff] [blame] | 402 | |
| 403 | if (!tty) |
| 404 | return -ENODEV; |
| 405 | |
| 406 | if (!tty->open_count) |
| 407 | return -EINVAL; |
| 408 | |
| 409 | return get_control_lines(tty); |
| 410 | } |
| 411 | |
| 412 | static int |
| 413 | ipw_tiocmset(struct tty_struct *linux_tty, struct file *file, |
| 414 | unsigned int set, unsigned int clear) |
| 415 | { |
| 416 | struct ipw_tty *tty = linux_tty->driver_data; |
Alan Cox | 5aaa70a | 2008-10-13 10:38:07 +0100 | [diff] [blame] | 417 | /* FIXME: Exactly how is the tty object locked here .. */ |
David Sterba | 099dc4f | 2008-02-07 10:57:12 +0100 | [diff] [blame] | 418 | |
| 419 | if (!tty) |
| 420 | return -ENODEV; |
| 421 | |
| 422 | if (!tty->open_count) |
| 423 | return -EINVAL; |
| 424 | |
| 425 | return set_control_lines(tty, set, clear); |
| 426 | } |
| 427 | |
| 428 | static int ipw_ioctl(struct tty_struct *linux_tty, struct file *file, |
| 429 | unsigned int cmd, unsigned long arg) |
| 430 | { |
| 431 | struct ipw_tty *tty = linux_tty->driver_data; |
| 432 | |
| 433 | if (!tty) |
| 434 | return -ENODEV; |
| 435 | |
| 436 | if (!tty->open_count) |
| 437 | return -EINVAL; |
| 438 | |
Alan Cox | 5aaa70a | 2008-10-13 10:38:07 +0100 | [diff] [blame] | 439 | /* FIXME: Exactly how is the tty object locked here .. */ |
| 440 | |
David Sterba | 099dc4f | 2008-02-07 10:57:12 +0100 | [diff] [blame] | 441 | switch (cmd) { |
| 442 | case TIOCGSERIAL: |
| 443 | return ipwireless_get_serial_info(tty, (void __user *) arg); |
| 444 | |
| 445 | case TIOCSSERIAL: |
| 446 | return 0; /* Keeps the PCMCIA scripts happy. */ |
| 447 | } |
| 448 | |
| 449 | if (tty->tty_type == TTYTYPE_MODEM) { |
| 450 | switch (cmd) { |
| 451 | case PPPIOCGCHAN: |
| 452 | { |
| 453 | int chan = ipwireless_ppp_channel_index( |
| 454 | tty->network); |
| 455 | |
| 456 | if (chan < 0) |
| 457 | return -ENODEV; |
| 458 | if (put_user(chan, (int __user *) arg)) |
| 459 | return -EFAULT; |
| 460 | } |
| 461 | return 0; |
| 462 | |
| 463 | case PPPIOCGUNIT: |
| 464 | { |
| 465 | int unit = ipwireless_ppp_unit_number( |
| 466 | tty->network); |
| 467 | |
| 468 | if (unit < 0) |
| 469 | return -ENODEV; |
| 470 | if (put_user(unit, (int __user *) arg)) |
| 471 | return -EFAULT; |
| 472 | } |
| 473 | return 0; |
| 474 | |
David Sterba | 099dc4f | 2008-02-07 10:57:12 +0100 | [diff] [blame] | 475 | case FIONREAD: |
| 476 | { |
| 477 | int val = 0; |
| 478 | |
| 479 | if (put_user(val, (int __user *) arg)) |
| 480 | return -EFAULT; |
| 481 | } |
| 482 | return 0; |
Alan Cox | 5aaa70a | 2008-10-13 10:38:07 +0100 | [diff] [blame] | 483 | case TCFLSH: |
| 484 | return tty_perform_flush(linux_tty, arg); |
David Sterba | 099dc4f | 2008-02-07 10:57:12 +0100 | [diff] [blame] | 485 | } |
| 486 | } |
Alan Cox | 5aaa70a | 2008-10-13 10:38:07 +0100 | [diff] [blame] | 487 | return tty_mode_ioctl(linux_tty, file, cmd , arg); |
David Sterba | 099dc4f | 2008-02-07 10:57:12 +0100 | [diff] [blame] | 488 | } |
| 489 | |
| 490 | static int add_tty(dev_node_t *nodesp, int j, |
| 491 | struct ipw_hardware *hardware, |
| 492 | struct ipw_network *network, int channel_idx, |
| 493 | int secondary_channel_idx, int tty_type) |
| 494 | { |
| 495 | ttys[j] = kzalloc(sizeof(struct ipw_tty), GFP_KERNEL); |
| 496 | if (!ttys[j]) |
| 497 | return -ENOMEM; |
| 498 | ttys[j]->index = j; |
| 499 | ttys[j]->hardware = hardware; |
| 500 | ttys[j]->channel_idx = channel_idx; |
| 501 | ttys[j]->secondary_channel_idx = secondary_channel_idx; |
| 502 | ttys[j]->network = network; |
| 503 | ttys[j]->tty_type = tty_type; |
| 504 | mutex_init(&ttys[j]->ipw_tty_mutex); |
| 505 | |
| 506 | tty_register_device(ipw_tty_driver, j, NULL); |
| 507 | ipwireless_associate_network_tty(network, channel_idx, ttys[j]); |
| 508 | |
| 509 | if (secondary_channel_idx != -1) |
| 510 | ipwireless_associate_network_tty(network, |
| 511 | secondary_channel_idx, |
| 512 | ttys[j]); |
| 513 | if (nodesp != NULL) { |
| 514 | sprintf(nodesp->dev_name, "ttyIPWp%d", j); |
| 515 | nodesp->major = ipw_tty_driver->major; |
| 516 | nodesp->minor = j + ipw_tty_driver->minor_start; |
| 517 | } |
| 518 | if (get_tty(j + ipw_tty_driver->minor_start) == ttys[j]) |
| 519 | report_registering(ttys[j]); |
| 520 | return 0; |
| 521 | } |
| 522 | |
| 523 | struct ipw_tty *ipwireless_tty_create(struct ipw_hardware *hardware, |
| 524 | struct ipw_network *network, |
| 525 | dev_node_t *nodes) |
| 526 | { |
| 527 | int i, j; |
| 528 | |
| 529 | for (i = 0; i < IPWIRELESS_PCMCIA_MINOR_RANGE; i++) { |
| 530 | int allfree = 1; |
| 531 | |
| 532 | for (j = i; j < IPWIRELESS_PCMCIA_MINORS; |
| 533 | j += IPWIRELESS_PCMCIA_MINOR_RANGE) |
| 534 | if (ttys[j] != NULL) { |
| 535 | allfree = 0; |
| 536 | break; |
| 537 | } |
| 538 | |
| 539 | if (allfree) { |
| 540 | j = i; |
| 541 | |
| 542 | if (add_tty(&nodes[0], j, hardware, network, |
| 543 | IPW_CHANNEL_DIALLER, IPW_CHANNEL_RAS, |
| 544 | TTYTYPE_MODEM)) |
| 545 | return NULL; |
| 546 | |
| 547 | j += IPWIRELESS_PCMCIA_MINOR_RANGE; |
| 548 | if (add_tty(&nodes[1], j, hardware, network, |
| 549 | IPW_CHANNEL_DIALLER, -1, |
| 550 | TTYTYPE_MONITOR)) |
| 551 | return NULL; |
| 552 | |
| 553 | j += IPWIRELESS_PCMCIA_MINOR_RANGE; |
| 554 | if (add_tty(NULL, j, hardware, network, |
| 555 | IPW_CHANNEL_RAS, -1, |
| 556 | TTYTYPE_RAS_RAW)) |
| 557 | return NULL; |
| 558 | |
| 559 | nodes[0].next = &nodes[1]; |
| 560 | nodes[1].next = NULL; |
| 561 | |
| 562 | return ttys[i]; |
| 563 | } |
| 564 | } |
| 565 | return NULL; |
| 566 | } |
| 567 | |
| 568 | /* |
| 569 | * Must be called before ipwireless_network_free(). |
| 570 | */ |
| 571 | void ipwireless_tty_free(struct ipw_tty *tty) |
| 572 | { |
| 573 | int j; |
| 574 | struct ipw_network *network = ttys[tty->index]->network; |
| 575 | |
| 576 | for (j = tty->index; j < IPWIRELESS_PCMCIA_MINORS; |
| 577 | j += IPWIRELESS_PCMCIA_MINOR_RANGE) { |
| 578 | struct ipw_tty *ttyj = ttys[j]; |
| 579 | |
| 580 | if (ttyj) { |
| 581 | mutex_lock(&ttyj->ipw_tty_mutex); |
| 582 | if (get_tty(j + ipw_tty_driver->minor_start) == ttyj) |
| 583 | report_deregistering(ttyj); |
| 584 | ttyj->closing = 1; |
| 585 | if (ttyj->linux_tty != NULL) { |
| 586 | mutex_unlock(&ttyj->ipw_tty_mutex); |
| 587 | tty_hangup(ttyj->linux_tty); |
| 588 | /* Wait till the tty_hangup has completed */ |
| 589 | flush_scheduled_work(); |
Alan Cox | 5aaa70a | 2008-10-13 10:38:07 +0100 | [diff] [blame] | 590 | /* FIXME: Exactly how is the tty object locked here |
| 591 | against a parallel ioctl etc */ |
David Sterba | 099dc4f | 2008-02-07 10:57:12 +0100 | [diff] [blame] | 592 | mutex_lock(&ttyj->ipw_tty_mutex); |
| 593 | } |
| 594 | while (ttyj->open_count) |
| 595 | do_ipw_close(ttyj); |
| 596 | ipwireless_disassociate_network_ttys(network, |
| 597 | ttyj->channel_idx); |
| 598 | tty_unregister_device(ipw_tty_driver, j); |
| 599 | ttys[j] = NULL; |
| 600 | mutex_unlock(&ttyj->ipw_tty_mutex); |
| 601 | kfree(ttyj); |
| 602 | } |
| 603 | } |
| 604 | } |
| 605 | |
| 606 | static struct tty_operations tty_ops = { |
| 607 | .open = ipw_open, |
| 608 | .close = ipw_close, |
| 609 | .hangup = ipw_hangup, |
| 610 | .write = ipw_write, |
| 611 | .write_room = ipw_write_room, |
| 612 | .ioctl = ipw_ioctl, |
| 613 | .chars_in_buffer = ipw_chars_in_buffer, |
| 614 | .tiocmget = ipw_tiocmget, |
| 615 | .tiocmset = ipw_tiocmset, |
| 616 | }; |
| 617 | |
| 618 | int ipwireless_tty_init(void) |
| 619 | { |
| 620 | int result; |
| 621 | |
| 622 | ipw_tty_driver = alloc_tty_driver(IPWIRELESS_PCMCIA_MINORS); |
| 623 | if (!ipw_tty_driver) |
| 624 | return -ENOMEM; |
| 625 | |
| 626 | ipw_tty_driver->owner = THIS_MODULE; |
| 627 | ipw_tty_driver->driver_name = IPWIRELESS_PCCARD_NAME; |
| 628 | ipw_tty_driver->name = "ttyIPWp"; |
| 629 | ipw_tty_driver->major = 0; |
| 630 | ipw_tty_driver->minor_start = IPWIRELESS_PCMCIA_START; |
| 631 | ipw_tty_driver->type = TTY_DRIVER_TYPE_SERIAL; |
| 632 | ipw_tty_driver->subtype = SERIAL_TYPE_NORMAL; |
| 633 | ipw_tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; |
| 634 | ipw_tty_driver->init_termios = tty_std_termios; |
| 635 | ipw_tty_driver->init_termios.c_cflag = |
| 636 | B9600 | CS8 | CREAD | HUPCL | CLOCAL; |
| 637 | ipw_tty_driver->init_termios.c_ispeed = 9600; |
| 638 | ipw_tty_driver->init_termios.c_ospeed = 9600; |
| 639 | tty_set_operations(ipw_tty_driver, &tty_ops); |
| 640 | result = tty_register_driver(ipw_tty_driver); |
| 641 | if (result) { |
| 642 | printk(KERN_ERR IPWIRELESS_PCCARD_NAME |
| 643 | ": failed to register tty driver\n"); |
| 644 | put_tty_driver(ipw_tty_driver); |
| 645 | return result; |
| 646 | } |
| 647 | |
| 648 | return 0; |
| 649 | } |
| 650 | |
| 651 | void ipwireless_tty_release(void) |
| 652 | { |
| 653 | int ret; |
| 654 | |
| 655 | ret = tty_unregister_driver(ipw_tty_driver); |
| 656 | put_tty_driver(ipw_tty_driver); |
| 657 | if (ret != 0) |
| 658 | printk(KERN_ERR IPWIRELESS_PCCARD_NAME |
| 659 | ": tty_unregister_driver failed with code %d\n", ret); |
| 660 | } |
| 661 | |
| 662 | int ipwireless_tty_is_modem(struct ipw_tty *tty) |
| 663 | { |
| 664 | return tty->tty_type == TTYTYPE_MODEM; |
| 665 | } |
| 666 | |
| 667 | void |
| 668 | ipwireless_tty_notify_control_line_change(struct ipw_tty *tty, |
| 669 | unsigned int channel_idx, |
| 670 | unsigned int control_lines, |
| 671 | unsigned int changed_mask) |
| 672 | { |
| 673 | unsigned int old_control_lines = tty->control_lines; |
| 674 | |
| 675 | tty->control_lines = (tty->control_lines & ~changed_mask) |
| 676 | | (control_lines & changed_mask); |
| 677 | |
| 678 | /* |
| 679 | * If DCD is de-asserted, we close the tty so pppd can tell that we |
| 680 | * have gone offline. |
| 681 | */ |
| 682 | if ((old_control_lines & IPW_CONTROL_LINE_DCD) |
| 683 | && !(tty->control_lines & IPW_CONTROL_LINE_DCD) |
| 684 | && tty->linux_tty) { |
| 685 | tty_hangup(tty->linux_tty); |
| 686 | } |
| 687 | } |
| 688 | |