Carl van Schaik | 438aa18 | 2018-07-06 22:22:42 +1000 | [diff] [blame] | 1 | /* |
| 2 | * drivers/char/vservice_serial.c |
| 3 | * |
| 4 | * Copyright (c) 2012-2018 General Dynamics |
| 5 | * Copyright (c) 2014 Open Kernel Labs, Inc. |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License version 2 as |
| 9 | * published by the Free Software Foundation. |
| 10 | * |
| 11 | * serial vservice client driver |
| 12 | * |
| 13 | */ |
| 14 | |
| 15 | #include <linux/kernel.h> |
| 16 | #include <linux/module.h> |
| 17 | #include <linux/bitmap.h> |
| 18 | #include <linux/tty.h> |
| 19 | #include <linux/tty_driver.h> |
| 20 | #include <linux/tty_flip.h> |
| 21 | #include <linux/console.h> |
| 22 | #include <linux/version.h> |
| 23 | #include <linux/sched.h> |
| 24 | #include <linux/wait.h> |
| 25 | #include <linux/mutex.h> |
| 26 | |
| 27 | #include <vservices/transport.h> |
| 28 | #include <vservices/types.h> |
| 29 | #include <vservices/buffer.h> |
| 30 | #include <vservices/protocol/serial/common.h> |
| 31 | #include <vservices/protocol/serial/types.h> |
| 32 | #include <vservices/protocol/serial/server.h> |
| 33 | #include <vservices/service.h> |
| 34 | #include <vservices/wait.h> |
| 35 | |
| 36 | #include "vs_serial_common.h" |
| 37 | |
| 38 | struct vtty_in_packet { |
| 39 | struct vs_pbuf pbuf; |
| 40 | size_t offset; |
| 41 | }; |
| 42 | |
| 43 | static int max_ttys = CONFIG_VSERVICES_VTTY_COUNT; |
| 44 | static unsigned long *alloced_ttys; |
| 45 | module_param(max_ttys, int, S_IRUGO); |
| 46 | |
| 47 | static struct tty_driver *vtty_driver; |
| 48 | |
| 49 | static DEFINE_MUTEX(tty_bitmap_lock); |
| 50 | |
| 51 | static struct vtty_port *dev_to_port(struct device *dev) |
| 52 | { |
| 53 | struct vs_service_device *service = to_vs_service_device(dev); |
| 54 | |
| 55 | #if defined(CONFIG_VSERVICES_SERIAL_SERVER) || \ |
| 56 | defined(CONFIG_VSERIVCES_SERIAL_SERVER_MODULE) |
| 57 | if (service->is_server) { |
| 58 | struct vs_server_serial_state *server = dev_get_drvdata(dev); |
| 59 | return container_of(server, struct vtty_port, u.vs_server); |
| 60 | } |
| 61 | #endif |
| 62 | #if defined(CONFIG_VSERVICES_SERIAL_CLIENT) || \ |
| 63 | defined(CONFIG_VSERIVCES_SERIAL_CLIENT_MODULE) |
| 64 | if (!service->is_server) { |
| 65 | struct vs_client_serial_state *client = dev_get_drvdata(dev); |
| 66 | return container_of(client, struct vtty_port, u.vs_client); |
| 67 | } |
| 68 | #endif |
| 69 | /* should never get here */ |
| 70 | WARN_ON(1); |
| 71 | return NULL; |
| 72 | } |
| 73 | |
| 74 | static struct vtty_port *port_from_tty(struct tty_struct *tty) |
| 75 | { |
| 76 | return dev_to_port(tty->dev->parent); |
| 77 | } |
| 78 | |
| 79 | static int vtty_install(struct tty_driver *driver, struct tty_struct *tty) |
| 80 | { |
| 81 | struct vtty_port *port; |
| 82 | |
| 83 | if (tty->index < 0 || !test_bit(tty->index, alloced_ttys)) |
| 84 | return -ENXIO; |
| 85 | |
| 86 | port = port_from_tty(tty); |
| 87 | |
| 88 | if (!port) |
| 89 | return -ENXIO; |
| 90 | |
| 91 | tty->driver_data = port; |
| 92 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(3,9,0) |
| 93 | if (tty->port) |
| 94 | tty->port->low_latency = 0; |
| 95 | #else |
| 96 | tty->low_latency = 0; |
| 97 | #endif |
| 98 | |
| 99 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(3,7,0) |
| 100 | tty_port_install(&port->port, driver, tty); |
| 101 | #elif LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0) |
| 102 | tty->port = &port->port; |
| 103 | tty_standard_install(driver, tty); |
| 104 | #else |
| 105 | tty->port = &port->port; |
| 106 | if (tty_init_termios(tty) != 0) |
| 107 | return -ENOMEM; |
| 108 | |
| 109 | tty_driver_kref_get(driver); |
| 110 | tty->count++; |
| 111 | driver->ttys[tty->index] = tty; |
| 112 | #endif |
| 113 | |
| 114 | return 0; |
| 115 | } |
| 116 | |
| 117 | static int vtty_open(struct tty_struct *tty, struct file *file) |
| 118 | { |
| 119 | struct vtty_port *port = tty->driver_data; |
| 120 | return tty_port_open(&port->port, tty, file); |
| 121 | } |
| 122 | |
| 123 | static void vtty_close(struct tty_struct *tty, struct file *file) |
| 124 | { |
| 125 | struct vtty_port *port = tty->driver_data; |
| 126 | if (port) |
| 127 | tty_port_close(&port->port, tty, file); |
| 128 | } |
| 129 | |
| 130 | static void vtty_shutdown(struct tty_port *port) |
| 131 | { |
| 132 | struct vtty_port *vtty_port = |
| 133 | container_of(port, struct vtty_port, port); |
| 134 | |
| 135 | if (vtty_port->doing_release) |
| 136 | kfree(port); |
| 137 | } |
| 138 | |
| 139 | static int vtty_write_room(struct tty_struct *tty) |
| 140 | { |
| 141 | struct vtty_port *port = tty->driver_data; |
| 142 | |
| 143 | return vs_service_send_mbufs_available(port->service) * |
| 144 | port->max_transfer_size; |
| 145 | } |
| 146 | |
| 147 | static struct vs_mbuf *vserial_alloc_send_buffer(struct vtty_port *port, |
| 148 | const unsigned char *buf, size_t size, struct vs_pbuf *pbuf, |
| 149 | gfp_t gfp_flags) |
| 150 | { |
| 151 | struct vs_mbuf *mbuf; |
| 152 | ssize_t ret; |
| 153 | |
| 154 | mbuf = port->ops.alloc_msg_buf(port, pbuf, gfp_flags); |
| 155 | if (IS_ERR(mbuf)) { |
| 156 | ret = PTR_ERR(mbuf); |
| 157 | goto fail; |
| 158 | } |
| 159 | |
| 160 | ret = vs_pbuf_resize(pbuf, size); |
| 161 | if (ret < (ssize_t)size) |
| 162 | goto fail_free_buf; |
| 163 | |
| 164 | ret = vs_pbuf_copyin(pbuf, 0, buf, size); |
| 165 | if (ret < (ssize_t)size) |
| 166 | goto fail_free_buf; |
| 167 | |
| 168 | return mbuf; |
| 169 | |
| 170 | fail_free_buf: |
| 171 | port->ops.free_msg_buf(port, mbuf, pbuf); |
| 172 | fail: |
| 173 | return ERR_PTR(ret); |
| 174 | } |
| 175 | |
| 176 | static int vtty_write(struct tty_struct *tty, const unsigned char *buf, |
| 177 | int count) |
| 178 | { |
| 179 | struct vtty_port *port; |
| 180 | size_t sent_bytes = 0, size; |
| 181 | struct vs_mbuf *mbuf; |
| 182 | struct vs_pbuf pbuf; |
| 183 | int err; |
| 184 | |
| 185 | if (WARN_ON(!tty || !buf)) |
| 186 | return -EINVAL; |
| 187 | |
| 188 | port = tty->driver_data; |
| 189 | if (!port->ops.is_running(port)) { |
| 190 | dev_dbg(&port->service->dev, "tty is not running!"); |
| 191 | return 0; |
| 192 | } |
| 193 | |
| 194 | /* |
| 195 | * We need to break our message up into chunks of |
| 196 | * port->max_transfer_size. |
| 197 | */ |
| 198 | dev_dbg(&port->service->dev, "Writing %d bytes\n", count); |
| 199 | while (sent_bytes < count) { |
| 200 | size = min_t(size_t, count - sent_bytes, |
| 201 | port->max_transfer_size); |
| 202 | |
| 203 | /* |
| 204 | * Passing &port->u.vs_client here works for both the client |
| 205 | * and the server since vs_client and vs_server are in the |
| 206 | * same union, and therefore have the same address. |
| 207 | */ |
| 208 | mbuf = vs_service_waiting_alloc(&port->u.vs_client, |
| 209 | vserial_alloc_send_buffer(port, |
| 210 | buf + sent_bytes, size, &pbuf, GFP_KERNEL)); |
| 211 | if (IS_ERR(mbuf)) { |
| 212 | dev_err(&port->service->dev, |
| 213 | "Failed to alloc mbuf of %zu bytes: %ld - resetting service\n", |
| 214 | size, PTR_ERR(mbuf)); |
| 215 | vs_service_reset(port->service, port->service); |
| 216 | return -EIO; |
| 217 | } |
| 218 | |
| 219 | vs_service_state_lock(port->service); |
| 220 | err = port->ops.send_msg_buf(port, mbuf, &pbuf); |
| 221 | vs_service_state_unlock(port->service); |
| 222 | if (err) { |
| 223 | port->ops.free_msg_buf(port, mbuf, &pbuf); |
| 224 | dev_err(&port->service->dev, |
| 225 | "send failed: %d - resetting service", |
| 226 | err); |
| 227 | vs_service_reset(port->service, port->service); |
| 228 | return -EIO; |
| 229 | } |
| 230 | |
| 231 | dev_dbg(&port->service->dev, "Sent %zu bytes (%zu/%d)\n", |
| 232 | size, sent_bytes + size, count); |
| 233 | sent_bytes += size; |
| 234 | } |
| 235 | |
| 236 | dev_dbg(&port->service->dev, "Write complete - sent %zu/%d bytes\n", |
| 237 | sent_bytes, count); |
| 238 | return sent_bytes; |
| 239 | } |
| 240 | |
| 241 | static int vtty_put_char(struct tty_struct *tty, unsigned char ch) |
| 242 | { |
| 243 | return vtty_write(tty, &ch, 1); |
| 244 | } |
| 245 | |
| 246 | static size_t vs_serial_send_pbuf_to_tty(struct vtty_port *port, |
| 247 | struct vs_pbuf *pbuf, size_t offset) |
| 248 | { |
| 249 | struct tty_struct *tty = tty_port_tty_get(&port->port); |
| 250 | size_t space, size; |
| 251 | |
| 252 | lockdep_assert_held(&port->in_lock); |
| 253 | |
| 254 | size = vs_pbuf_size(pbuf) - offset; |
| 255 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(3,9,0) |
| 256 | space = tty_buffer_request_room(tty->port, size); |
| 257 | #else |
| 258 | space = tty_buffer_request_room(tty, size); |
| 259 | #endif |
| 260 | if (space) { |
| 261 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(3,9,0) |
| 262 | tty_insert_flip_string(tty->port, pbuf->data + offset, space); |
| 263 | tty_flip_buffer_push(tty->port); |
| 264 | #else |
| 265 | tty_insert_flip_string(tty, pbuf->data + offset, space); |
| 266 | tty_flip_buffer_push(tty); |
| 267 | #endif |
| 268 | } |
| 269 | |
| 270 | tty_kref_put(tty); |
| 271 | |
| 272 | /* Return the number of bytes written */ |
| 273 | return space; |
| 274 | } |
| 275 | |
| 276 | static void vtty_throttle(struct tty_struct *tty) |
| 277 | { |
| 278 | struct vtty_port *port = tty->driver_data; |
| 279 | |
| 280 | dev_dbg(&port->service->dev, "throttle\n"); |
| 281 | |
| 282 | spin_lock_bh(&port->in_lock); |
| 283 | port->tty_canrecv = false; |
| 284 | spin_unlock_bh(&port->in_lock); |
| 285 | } |
| 286 | |
| 287 | static void vtty_unthrottle(struct tty_struct *tty) |
| 288 | { |
| 289 | struct vtty_port *port = tty->driver_data; |
| 290 | struct vtty_in_packet *packet; |
| 291 | struct vs_mbuf *mbuf; |
| 292 | size_t sent; |
| 293 | |
| 294 | dev_dbg(&port->service->dev, "unthrottle\n"); |
| 295 | |
| 296 | spin_lock_bh(&port->in_lock); |
| 297 | |
| 298 | while (!list_empty(&port->pending_in_packets)) { |
| 299 | mbuf = list_first_entry(&port->pending_in_packets, |
| 300 | struct vs_mbuf, queue); |
| 301 | packet = mbuf->priv; |
| 302 | |
| 303 | sent = vs_serial_send_pbuf_to_tty(port, &packet->pbuf, |
| 304 | packet->offset); |
| 305 | packet->offset += sent; |
| 306 | if (packet->offset < vs_pbuf_size(&packet->pbuf)) { |
| 307 | /* |
| 308 | * Only wrote part of the buffer. This means that we |
| 309 | * still have pending data that cannot be written to |
| 310 | * the tty at this time. The tty layer will rethrottle |
| 311 | * and this function will be called again when the tty |
| 312 | * layer is next able to handle data and we can write |
| 313 | * the remainder of the buffer. |
| 314 | */ |
| 315 | dev_dbg(&port->service->dev, |
| 316 | "unthrottle: Only wrote %zu (%zu/%zu) bytes\n", |
| 317 | sent, packet->offset, |
| 318 | vs_pbuf_size(&packet->pbuf)); |
| 319 | break; |
| 320 | } |
| 321 | |
| 322 | dev_dbg(&port->service->dev, |
| 323 | "unthrottle: wrote %zu (%zu/%zu) bytes\n", |
| 324 | sent, packet->offset, |
| 325 | vs_pbuf_size(&packet->pbuf)); |
| 326 | |
| 327 | /* Wrote the whole buffer - free it */ |
| 328 | list_del(&mbuf->queue); |
| 329 | port->ops.free_msg_buf(port, mbuf, &packet->pbuf); |
| 330 | kfree(packet); |
| 331 | } |
| 332 | |
| 333 | port->tty_canrecv = true; |
| 334 | spin_unlock_bh(&port->in_lock); |
| 335 | } |
| 336 | |
| 337 | static struct tty_port_operations vtty_port_ops = { |
| 338 | .shutdown = vtty_shutdown, |
| 339 | }; |
| 340 | |
| 341 | static struct tty_operations vtty_ops = { |
| 342 | .install = vtty_install, |
| 343 | .open = vtty_open, |
| 344 | .close = vtty_close, |
| 345 | .write = vtty_write, |
| 346 | .write_room = vtty_write_room, |
| 347 | .put_char = vtty_put_char, |
| 348 | .throttle = vtty_throttle, |
| 349 | .unthrottle = vtty_unthrottle |
| 350 | }; |
| 351 | |
| 352 | static int vs_serial_queue_incoming_packet(struct vtty_port *port, |
| 353 | struct vs_mbuf *mbuf, struct vs_pbuf *pbuf, size_t offset) |
| 354 | { |
| 355 | struct vtty_in_packet *packet; |
| 356 | |
| 357 | lockdep_assert_held(&port->in_lock); |
| 358 | |
| 359 | packet = kzalloc(sizeof(*packet), GFP_ATOMIC); |
| 360 | if (!packet) { |
| 361 | /* |
| 362 | * Uh oh, we are seriously out of memory. The incoming data |
| 363 | * will be lost. |
| 364 | */ |
| 365 | return -ENOMEM; |
| 366 | } |
| 367 | |
| 368 | dev_dbg(&port->service->dev, "Queuing packet %zu bytes, offset %zu\n", |
| 369 | vs_pbuf_size(pbuf), offset); |
| 370 | mbuf->priv = packet; |
| 371 | memcpy(&packet->pbuf, pbuf, sizeof(*pbuf)); |
| 372 | packet->offset = offset; |
| 373 | |
| 374 | list_add_tail(&mbuf->queue, &port->pending_in_packets); |
| 375 | return 0; |
| 376 | } |
| 377 | |
| 378 | int vs_serial_handle_message(struct vtty_port *port, struct vs_mbuf *mbuf, |
| 379 | struct vs_pbuf *pbuf) |
| 380 | { |
| 381 | struct tty_struct *tty = tty_port_tty_get(&port->port); |
| 382 | bool queue_packet = false; |
| 383 | size_t sent = 0; |
| 384 | int err; |
| 385 | |
| 386 | if (!tty) { |
| 387 | dev_dbg(&port->service->dev, |
| 388 | "tty not open. Dropping %zu chars\n", |
| 389 | pbuf->size); |
| 390 | port->ops.free_msg_buf(port, mbuf, pbuf); |
| 391 | return 0; |
| 392 | } |
| 393 | |
| 394 | dev_dbg(&port->service->dev, "Incoming message - len = %zu\n", |
| 395 | pbuf->size); |
| 396 | |
| 397 | spin_lock(&port->in_lock); |
| 398 | if (!port->tty_canrecv || !list_empty(&port->pending_in_packets)) { |
| 399 | /* |
| 400 | * We cannot send to the tty right now, either because we are |
| 401 | * being throttled or because we still have pending data |
| 402 | * to write out to the tty. Queue the buffer up so we can |
| 403 | * write it later. |
| 404 | */ |
| 405 | dev_dbg(&port->service->dev, |
| 406 | "Cannot send (canrecv = %d, queued = %d) - queuing message\n", |
| 407 | port->tty_canrecv, |
| 408 | !list_empty(&port->pending_in_packets)); |
| 409 | queue_packet = true; |
| 410 | |
| 411 | } else { |
| 412 | sent = vs_serial_send_pbuf_to_tty(port, pbuf, 0); |
| 413 | if (sent < vs_pbuf_size(pbuf)) { |
| 414 | /* |
| 415 | * Only wrote part of the buffer to the tty. Queue |
| 416 | * the buffer to write the rest. |
| 417 | */ |
| 418 | dev_dbg(&port->service->dev, |
| 419 | "Sent %zu/%zu bytes to tty - queueing rest\n", |
| 420 | sent, vs_pbuf_size(pbuf)); |
| 421 | queue_packet = true; |
| 422 | } |
| 423 | } |
| 424 | |
| 425 | if (queue_packet) { |
| 426 | /* |
| 427 | * Queue the incoming data up. If we are not already throttled, |
| 428 | * the tty layer will do so now since it has no room in its |
| 429 | * buffers. |
| 430 | */ |
| 431 | err = vs_serial_queue_incoming_packet(port, mbuf, pbuf, sent); |
| 432 | if (err) { |
| 433 | dev_err(&port->service->dev, |
| 434 | "Failed to queue packet - dropping chars\n"); |
| 435 | port->ops.free_msg_buf(port, mbuf, pbuf); |
| 436 | } |
| 437 | |
| 438 | } else { |
| 439 | port->ops.free_msg_buf(port, mbuf, pbuf); |
| 440 | } |
| 441 | |
| 442 | spin_unlock(&port->in_lock); |
| 443 | tty_kref_put(tty); |
| 444 | |
| 445 | return 0; |
| 446 | } |
| 447 | EXPORT_SYMBOL_GPL(vs_serial_handle_message); |
| 448 | |
| 449 | #ifdef CONFIG_OKL4_VTTY_CONSOLE |
| 450 | static int vconsole_setup(struct console *co, char *options) |
| 451 | { |
| 452 | if (co->index < 0 || co->index >= max_ttys) |
| 453 | co->index = 0; |
| 454 | |
| 455 | pr_info("OKL4 virtual console init\n"); |
| 456 | |
| 457 | return 0; |
| 458 | } |
| 459 | |
| 460 | static void vconsole_write(struct console *co, const char *p, unsigned count) |
| 461 | { |
| 462 | } |
| 463 | |
| 464 | static struct tty_driver *vconsole_device(struct console *co, int *index) |
| 465 | { |
| 466 | *index = co->index; |
| 467 | |
| 468 | return vtty_driver; |
| 469 | } |
| 470 | #endif /* CONFIG_OKL4_VTTY_CONSOLE */ |
| 471 | |
| 472 | static void vs_serial_free_buffers(struct vtty_port *port) |
| 473 | { |
| 474 | struct vtty_in_packet *packet; |
| 475 | struct vs_mbuf *mbuf; |
| 476 | |
| 477 | /* Free the list of incoming buffers */ |
| 478 | spin_lock_bh(&port->in_lock); |
| 479 | while (!list_empty(&port->pending_in_packets)) { |
| 480 | mbuf = list_first_entry(&port->pending_in_packets, |
| 481 | struct vs_mbuf, queue); |
| 482 | packet = mbuf->priv; |
| 483 | |
| 484 | list_del(&mbuf->queue); |
| 485 | port->ops.free_msg_buf(port, mbuf, &packet->pbuf); |
| 486 | kfree(packet); |
| 487 | } |
| 488 | spin_unlock_bh(&port->in_lock); |
| 489 | } |
| 490 | |
| 491 | /** vservices callbacks **/ |
| 492 | struct vtty_port *vs_serial_alloc_port(struct vs_service_device *service, |
| 493 | struct vtty_port_ops *port_ops) |
| 494 | { |
| 495 | struct vtty_port *port; |
| 496 | int port_num; |
| 497 | |
| 498 | mutex_lock(&tty_bitmap_lock); |
| 499 | port_num = find_first_zero_bit(alloced_ttys, max_ttys); |
| 500 | |
| 501 | if (port_num >= max_ttys) { |
| 502 | mutex_unlock(&tty_bitmap_lock); |
| 503 | return NULL; |
| 504 | } |
| 505 | |
| 506 | port = kzalloc(sizeof(struct vtty_port), GFP_KERNEL); |
| 507 | if (!port) { |
| 508 | mutex_unlock(&tty_bitmap_lock); |
| 509 | return NULL; |
| 510 | } |
| 511 | |
| 512 | port->service = service; |
| 513 | port->ops = *port_ops; |
| 514 | port->tty_canrecv = true; |
| 515 | port->port_num = port_num; |
| 516 | INIT_LIST_HEAD(&port->pending_in_packets); |
| 517 | spin_lock_init(&port->in_lock); |
| 518 | #ifdef CONFIG_OKL4_VTTY_CONSOLE |
| 519 | /* Set up and register the port's console device */ |
| 520 | strlcpy(port->console.name, "vconvs", sizeof(port->console.name)); |
| 521 | port->console.write = vconsole_write; |
| 522 | port->console.flags = CON_PRINTBUFFER; |
| 523 | port->console.device = vconsole_device; |
| 524 | port->console.setup = vconsole_setup; |
| 525 | port->console.index = port_num; |
| 526 | |
| 527 | register_console(&port->console); |
| 528 | #endif |
| 529 | port->vtty_driver = vtty_driver; |
| 530 | |
| 531 | tty_port_init(&port->port); |
| 532 | port->port.ops = &vtty_port_ops; |
| 533 | |
| 534 | tty_register_device(vtty_driver, port_num, &service->dev); |
| 535 | bitmap_set(alloced_ttys, port_num, 1); |
| 536 | mutex_unlock(&tty_bitmap_lock); |
| 537 | |
| 538 | return port; |
| 539 | } |
| 540 | EXPORT_SYMBOL(vs_serial_alloc_port); |
| 541 | |
| 542 | void vs_serial_release(struct vtty_port *port) |
| 543 | { |
| 544 | dev_dbg(&port->service->dev, "Release\n"); |
| 545 | |
| 546 | #ifdef CONFIG_OKL4_VTTY_CONSOLE |
| 547 | unregister_console(&port->console); |
| 548 | #endif |
| 549 | |
| 550 | mutex_lock(&tty_bitmap_lock); |
| 551 | bitmap_clear(alloced_ttys, port->port_num, 1); |
| 552 | mutex_unlock(&tty_bitmap_lock); |
| 553 | |
| 554 | if (port->port.tty) { |
| 555 | tty_vhangup(port->port.tty); |
| 556 | tty_kref_put(port->port.tty); |
| 557 | } |
| 558 | |
| 559 | vs_serial_free_buffers(port); |
| 560 | port->doing_release = true; |
| 561 | tty_unregister_device(vtty_driver, port->port_num); |
| 562 | } |
| 563 | EXPORT_SYMBOL_GPL(vs_serial_release); |
| 564 | |
| 565 | void vs_serial_reset(struct vtty_port *port) |
| 566 | { |
| 567 | /* Free list of in and out mbufs. */ |
| 568 | vs_serial_free_buffers(port); |
| 569 | } |
| 570 | EXPORT_SYMBOL_GPL(vs_serial_reset); |
| 571 | |
| 572 | static int __init vs_serial_init(void) |
| 573 | { |
| 574 | int err; |
| 575 | |
| 576 | if (max_ttys == 0) |
| 577 | return -EINVAL; |
| 578 | |
| 579 | alloced_ttys = kzalloc(sizeof(unsigned long) * BITS_TO_LONGS(max_ttys), |
| 580 | GFP_KERNEL); |
| 581 | if (!alloced_ttys) { |
| 582 | err = -ENOMEM; |
| 583 | goto fail_alloc_ttys; |
| 584 | } |
| 585 | |
| 586 | /* Set up the tty driver. */ |
| 587 | vtty_driver = alloc_tty_driver(max_ttys); |
| 588 | if (!vtty_driver) { |
| 589 | err = -ENOMEM; |
| 590 | goto fail_alloc_tty_driver; |
| 591 | } |
| 592 | |
| 593 | vtty_driver->owner = THIS_MODULE; |
| 594 | vtty_driver->driver_name = "okl4-vservices-serial"; |
| 595 | vtty_driver->name = "ttyVS"; |
| 596 | vtty_driver->type = TTY_DRIVER_TYPE_SERIAL; |
| 597 | vtty_driver->subtype = SERIAL_TYPE_NORMAL; |
| 598 | vtty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; |
| 599 | vtty_driver->init_termios = tty_std_termios; |
| 600 | vtty_driver->num = max_ttys; |
| 601 | |
| 602 | /* These flags don't really matter; just use sensible defaults. */ |
| 603 | vtty_driver->init_termios.c_cflag = |
| 604 | B9600 | CS8 | CREAD | HUPCL | CLOCAL; |
| 605 | vtty_driver->init_termios.c_ispeed = 9600; |
| 606 | vtty_driver->init_termios.c_ospeed = 9600; |
| 607 | |
| 608 | tty_set_operations(vtty_driver, &vtty_ops); |
| 609 | |
| 610 | err = tty_register_driver(vtty_driver); |
| 611 | if (err) |
| 612 | goto fail_tty_driver_register; |
| 613 | |
| 614 | return 0; |
| 615 | |
| 616 | fail_tty_driver_register: |
| 617 | put_tty_driver(vtty_driver); |
| 618 | fail_alloc_tty_driver: |
| 619 | kfree(alloced_ttys); |
| 620 | fail_alloc_ttys: |
| 621 | return err; |
| 622 | } |
| 623 | |
| 624 | static void __exit vs_serial_exit(void) |
| 625 | { |
| 626 | tty_unregister_driver(vtty_driver); |
| 627 | put_tty_driver(vtty_driver); |
| 628 | } |
| 629 | |
| 630 | module_init(vs_serial_init); |
| 631 | module_exit(vs_serial_exit); |
| 632 | |
| 633 | MODULE_DESCRIPTION("OKL4 Virtual Services Serial Core Driver"); |
| 634 | MODULE_AUTHOR("Open Kernel Labs, Inc"); |