1 /* 2 * IBM/3270 Driver - fullscreen driver. 3 * 4 * Author(s): 5 * Original 3270 Code for 2.4 written by Richard Hitt (UTS Global) 6 * Rewritten for 2.5/2.6 by Martin Schwidefsky <schwidefsky@de.ibm.com> 7 * Copyright IBM Corp. 2003, 2009 8 */ 9 10 #include <linux/bootmem.h> 11 #include <linux/console.h> 12 #include <linux/init.h> 13 #include <linux/interrupt.h> 14 #include <linux/compat.h> 15 #include <linux/module.h> 16 #include <linux/list.h> 17 #include <linux/slab.h> 18 #include <linux/types.h> 19 20 #include <asm/compat.h> 21 #include <asm/ccwdev.h> 22 #include <asm/cio.h> 23 #include <asm/ebcdic.h> 24 #include <asm/idals.h> 25 26 #include "raw3270.h" 27 #include "ctrlchar.h" 28 29 static struct raw3270_fn fs3270_fn; 30 31 struct fs3270 { 32 struct raw3270_view view; 33 struct pid *fs_pid; /* Pid of controlling program. */ 34 int read_command; /* ccw command to use for reads. */ 35 int write_command; /* ccw command to use for writes. */ 36 int attention; /* Got attention. */ 37 int active; /* Fullscreen view is active. */ 38 struct raw3270_request *init; /* single init request. */ 39 wait_queue_head_t wait; /* Init & attention wait queue. */ 40 struct idal_buffer *rdbuf; /* full-screen-deactivate buffer */ 41 size_t rdbuf_size; /* size of data returned by RDBUF */ 42 }; 43 44 static DEFINE_MUTEX(fs3270_mutex); 45 46 static void 47 fs3270_wake_up(struct raw3270_request *rq, void *data) 48 { 49 wake_up((wait_queue_head_t *) data); 50 } 51 52 static inline int 53 fs3270_working(struct fs3270 *fp) 54 { 55 /* 56 * The fullscreen view is in working order if the view 57 * has been activated AND the initial request is finished. 58 */ 59 return fp->active && raw3270_request_final(fp->init); 60 } 61 62 static int 63 fs3270_do_io(struct raw3270_view *view, struct raw3270_request *rq) 64 { 65 struct fs3270 *fp; 66 int rc; 67 68 fp = (struct fs3270 *) view; 69 rq->callback = fs3270_wake_up; 70 rq->callback_data = &fp->wait; 71 72 do { 73 if (!fs3270_working(fp)) { 74 /* Fullscreen view isn't ready yet. */ 75 rc = wait_event_interruptible(fp->wait, 76 fs3270_working(fp)); 77 if (rc != 0) 78 break; 79 } 80 rc = raw3270_start(view, rq); 81 if (rc == 0) { 82 /* Started successfully. Now wait for completion. */ 83 wait_event(fp->wait, raw3270_request_final(rq)); 84 } 85 } while (rc == -EACCES); 86 return rc; 87 } 88 89 /* 90 * Switch to the fullscreen view. 91 */ 92 static void 93 fs3270_reset_callback(struct raw3270_request *rq, void *data) 94 { 95 struct fs3270 *fp; 96 97 fp = (struct fs3270 *) rq->view; 98 raw3270_request_reset(rq); 99 wake_up(&fp->wait); 100 } 101 102 static void 103 fs3270_restore_callback(struct raw3270_request *rq, void *data) 104 { 105 struct fs3270 *fp; 106 107 fp = (struct fs3270 *) rq->view; 108 if (rq->rc != 0 || rq->rescnt != 0) { 109 if (fp->fs_pid) 110 kill_pid(fp->fs_pid, SIGHUP, 1); 111 } 112 fp->rdbuf_size = 0; 113 raw3270_request_reset(rq); 114 wake_up(&fp->wait); 115 } 116 117 static int 118 fs3270_activate(struct raw3270_view *view) 119 { 120 struct fs3270 *fp; 121 char *cp; 122 int rc; 123 124 fp = (struct fs3270 *) view; 125 126 /* If an old init command is still running just return. */ 127 if (!raw3270_request_final(fp->init)) 128 return 0; 129 130 if (fp->rdbuf_size == 0) { 131 /* No saved buffer. Just clear the screen. */ 132 raw3270_request_set_cmd(fp->init, TC_EWRITEA); 133 fp->init->callback = fs3270_reset_callback; 134 } else { 135 /* Restore fullscreen buffer saved by fs3270_deactivate. */ 136 raw3270_request_set_cmd(fp->init, TC_EWRITEA); 137 raw3270_request_set_idal(fp->init, fp->rdbuf); 138 fp->init->ccw.count = fp->rdbuf_size; 139 cp = fp->rdbuf->data[0]; 140 cp[0] = TW_KR; 141 cp[1] = TO_SBA; 142 cp[2] = cp[6]; 143 cp[3] = cp[7]; 144 cp[4] = TO_IC; 145 cp[5] = TO_SBA; 146 cp[6] = 0x40; 147 cp[7] = 0x40; 148 fp->init->rescnt = 0; 149 fp->init->callback = fs3270_restore_callback; 150 } 151 rc = fp->init->rc = raw3270_start_locked(view, fp->init); 152 if (rc) 153 fp->init->callback(fp->init, NULL); 154 else 155 fp->active = 1; 156 return rc; 157 } 158 159 /* 160 * Shutdown fullscreen view. 161 */ 162 static void 163 fs3270_save_callback(struct raw3270_request *rq, void *data) 164 { 165 struct fs3270 *fp; 166 167 fp = (struct fs3270 *) rq->view; 168 169 /* Correct idal buffer element 0 address. */ 170 fp->rdbuf->data[0] -= 5; 171 fp->rdbuf->size += 5; 172 173 /* 174 * If the rdbuf command failed or the idal buffer is 175 * to small for the amount of data returned by the 176 * rdbuf command, then we have no choice but to send 177 * a SIGHUP to the application. 178 */ 179 if (rq->rc != 0 || rq->rescnt == 0) { 180 if (fp->fs_pid) 181 kill_pid(fp->fs_pid, SIGHUP, 1); 182 fp->rdbuf_size = 0; 183 } else 184 fp->rdbuf_size = fp->rdbuf->size - rq->rescnt; 185 raw3270_request_reset(rq); 186 wake_up(&fp->wait); 187 } 188 189 static void 190 fs3270_deactivate(struct raw3270_view *view) 191 { 192 struct fs3270 *fp; 193 194 fp = (struct fs3270 *) view; 195 fp->active = 0; 196 197 /* If an old init command is still running just return. */ 198 if (!raw3270_request_final(fp->init)) 199 return; 200 201 /* Prepare read-buffer request. */ 202 raw3270_request_set_cmd(fp->init, TC_RDBUF); 203 /* 204 * Hackish: skip first 5 bytes of the idal buffer to make 205 * room for the TW_KR/TO_SBA/<address>/<address>/TO_IC sequence 206 * in the activation command. 207 */ 208 fp->rdbuf->data[0] += 5; 209 fp->rdbuf->size -= 5; 210 raw3270_request_set_idal(fp->init, fp->rdbuf); 211 fp->init->rescnt = 0; 212 fp->init->callback = fs3270_save_callback; 213 214 /* Start I/O to read in the 3270 buffer. */ 215 fp->init->rc = raw3270_start_locked(view, fp->init); 216 if (fp->init->rc) 217 fp->init->callback(fp->init, NULL); 218 } 219 220 static int 221 fs3270_irq(struct fs3270 *fp, struct raw3270_request *rq, struct irb *irb) 222 { 223 /* Handle ATTN. Set indication and wake waiters for attention. */ 224 if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) { 225 fp->attention = 1; 226 wake_up(&fp->wait); 227 } 228 229 if (rq) { 230 if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) 231 rq->rc = -EIO; 232 else 233 /* Normal end. Copy residual count. */ 234 rq->rescnt = irb->scsw.cmd.count; 235 } 236 return RAW3270_IO_DONE; 237 } 238 239 /* 240 * Process reads from fullscreen 3270. 241 */ 242 static ssize_t 243 fs3270_read(struct file *filp, char __user *data, size_t count, loff_t *off) 244 { 245 struct fs3270 *fp; 246 struct raw3270_request *rq; 247 struct idal_buffer *ib; 248 ssize_t rc; 249 250 if (count == 0 || count > 65535) 251 return -EINVAL; 252 fp = filp->private_data; 253 if (!fp) 254 return -ENODEV; 255 ib = idal_buffer_alloc(count, 0); 256 if (IS_ERR(ib)) 257 return -ENOMEM; 258 rq = raw3270_request_alloc(0); 259 if (!IS_ERR(rq)) { 260 if (fp->read_command == 0 && fp->write_command != 0) 261 fp->read_command = 6; 262 raw3270_request_set_cmd(rq, fp->read_command ? : 2); 263 raw3270_request_set_idal(rq, ib); 264 rc = wait_event_interruptible(fp->wait, fp->attention); 265 fp->attention = 0; 266 if (rc == 0) { 267 rc = fs3270_do_io(&fp->view, rq); 268 if (rc == 0) { 269 count -= rq->rescnt; 270 if (idal_buffer_to_user(ib, data, count) != 0) 271 rc = -EFAULT; 272 else 273 rc = count; 274 275 } 276 } 277 raw3270_request_free(rq); 278 } else 279 rc = PTR_ERR(rq); 280 idal_buffer_free(ib); 281 return rc; 282 } 283 284 /* 285 * Process writes to fullscreen 3270. 286 */ 287 static ssize_t 288 fs3270_write(struct file *filp, const char __user *data, size_t count, loff_t *off) 289 { 290 struct fs3270 *fp; 291 struct raw3270_request *rq; 292 struct idal_buffer *ib; 293 int write_command; 294 ssize_t rc; 295 296 fp = filp->private_data; 297 if (!fp) 298 return -ENODEV; 299 ib = idal_buffer_alloc(count, 0); 300 if (IS_ERR(ib)) 301 return -ENOMEM; 302 rq = raw3270_request_alloc(0); 303 if (!IS_ERR(rq)) { 304 if (idal_buffer_from_user(ib, data, count) == 0) { 305 write_command = fp->write_command ? : 1; 306 if (write_command == 5) 307 write_command = 13; 308 raw3270_request_set_cmd(rq, write_command); 309 raw3270_request_set_idal(rq, ib); 310 rc = fs3270_do_io(&fp->view, rq); 311 if (rc == 0) 312 rc = count - rq->rescnt; 313 } else 314 rc = -EFAULT; 315 raw3270_request_free(rq); 316 } else 317 rc = PTR_ERR(rq); 318 idal_buffer_free(ib); 319 return rc; 320 } 321 322 /* 323 * process ioctl commands for the tube driver 324 */ 325 static long 326 fs3270_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) 327 { 328 char __user *argp; 329 struct fs3270 *fp; 330 struct raw3270_iocb iocb; 331 int rc; 332 333 fp = filp->private_data; 334 if (!fp) 335 return -ENODEV; 336 if (is_compat_task()) 337 argp = compat_ptr(arg); 338 else 339 argp = (char __user *)arg; 340 rc = 0; 341 mutex_lock(&fs3270_mutex); 342 switch (cmd) { 343 case TUBICMD: 344 fp->read_command = arg; 345 break; 346 case TUBOCMD: 347 fp->write_command = arg; 348 break; 349 case TUBGETI: 350 rc = put_user(fp->read_command, argp); 351 break; 352 case TUBGETO: 353 rc = put_user(fp->write_command, argp); 354 break; 355 case TUBGETMOD: 356 iocb.model = fp->view.model; 357 iocb.line_cnt = fp->view.rows; 358 iocb.col_cnt = fp->view.cols; 359 iocb.pf_cnt = 24; 360 iocb.re_cnt = 20; 361 iocb.map = 0; 362 if (copy_to_user(argp, &iocb, sizeof(struct raw3270_iocb))) 363 rc = -EFAULT; 364 break; 365 } 366 mutex_unlock(&fs3270_mutex); 367 return rc; 368 } 369 370 /* 371 * Allocate fs3270 structure. 372 */ 373 static struct fs3270 * 374 fs3270_alloc_view(void) 375 { 376 struct fs3270 *fp; 377 378 fp = kzalloc(sizeof(struct fs3270),GFP_KERNEL); 379 if (!fp) 380 return ERR_PTR(-ENOMEM); 381 fp->init = raw3270_request_alloc(0); 382 if (IS_ERR(fp->init)) { 383 kfree(fp); 384 return ERR_PTR(-ENOMEM); 385 } 386 return fp; 387 } 388 389 /* 390 * Free fs3270 structure. 391 */ 392 static void 393 fs3270_free_view(struct raw3270_view *view) 394 { 395 struct fs3270 *fp; 396 397 fp = (struct fs3270 *) view; 398 if (fp->rdbuf) 399 idal_buffer_free(fp->rdbuf); 400 raw3270_request_free(((struct fs3270 *) view)->init); 401 kfree(view); 402 } 403 404 /* 405 * Unlink fs3270 data structure from filp. 406 */ 407 static void 408 fs3270_release(struct raw3270_view *view) 409 { 410 struct fs3270 *fp; 411 412 fp = (struct fs3270 *) view; 413 if (fp->fs_pid) 414 kill_pid(fp->fs_pid, SIGHUP, 1); 415 } 416 417 /* View to a 3270 device. Can be console, tty or fullscreen. */ 418 static struct raw3270_fn fs3270_fn = { 419 .activate = fs3270_activate, 420 .deactivate = fs3270_deactivate, 421 .intv = (void *) fs3270_irq, 422 .release = fs3270_release, 423 .free = fs3270_free_view 424 }; 425 426 /* 427 * This routine is called whenever a 3270 fullscreen device is opened. 428 */ 429 static int 430 fs3270_open(struct inode *inode, struct file *filp) 431 { 432 struct fs3270 *fp; 433 struct idal_buffer *ib; 434 int minor, rc = 0; 435 436 if (imajor(filp->f_path.dentry->d_inode) != IBM_FS3270_MAJOR) 437 return -ENODEV; 438 minor = iminor(filp->f_path.dentry->d_inode); 439 /* Check for minor 0 multiplexer. */ 440 if (minor == 0) { 441 struct tty_struct *tty = get_current_tty(); 442 if (!tty || tty->driver->major != IBM_TTY3270_MAJOR) { 443 tty_kref_put(tty); 444 return -ENODEV; 445 } 446 minor = tty->index + RAW3270_FIRSTMINOR; 447 tty_kref_put(tty); 448 } 449 mutex_lock(&fs3270_mutex); 450 /* Check if some other program is already using fullscreen mode. */ 451 fp = (struct fs3270 *) raw3270_find_view(&fs3270_fn, minor); 452 if (!IS_ERR(fp)) { 453 raw3270_put_view(&fp->view); 454 rc = -EBUSY; 455 goto out; 456 } 457 /* Allocate fullscreen view structure. */ 458 fp = fs3270_alloc_view(); 459 if (IS_ERR(fp)) { 460 rc = PTR_ERR(fp); 461 goto out; 462 } 463 464 init_waitqueue_head(&fp->wait); 465 fp->fs_pid = get_pid(task_pid(current)); 466 rc = raw3270_add_view(&fp->view, &fs3270_fn, minor); 467 if (rc) { 468 fs3270_free_view(&fp->view); 469 goto out; 470 } 471 472 /* Allocate idal-buffer. */ 473 ib = idal_buffer_alloc(2*fp->view.rows*fp->view.cols + 5, 0); 474 if (IS_ERR(ib)) { 475 raw3270_put_view(&fp->view); 476 raw3270_del_view(&fp->view); 477 rc = PTR_ERR(ib); 478 goto out; 479 } 480 fp->rdbuf = ib; 481 482 rc = raw3270_activate_view(&fp->view); 483 if (rc) { 484 raw3270_put_view(&fp->view); 485 raw3270_del_view(&fp->view); 486 goto out; 487 } 488 nonseekable_open(inode, filp); 489 filp->private_data = fp; 490 out: 491 mutex_unlock(&fs3270_mutex); 492 return rc; 493 } 494 495 /* 496 * This routine is called when the 3270 tty is closed. We wait 497 * for the remaining request to be completed. Then we clean up. 498 */ 499 static int 500 fs3270_close(struct inode *inode, struct file *filp) 501 { 502 struct fs3270 *fp; 503 504 fp = filp->private_data; 505 filp->private_data = NULL; 506 if (fp) { 507 put_pid(fp->fs_pid); 508 fp->fs_pid = NULL; 509 raw3270_reset(&fp->view); 510 raw3270_put_view(&fp->view); 511 raw3270_del_view(&fp->view); 512 } 513 return 0; 514 } 515 516 static const struct file_operations fs3270_fops = { 517 .owner = THIS_MODULE, /* owner */ 518 .read = fs3270_read, /* read */ 519 .write = fs3270_write, /* write */ 520 .unlocked_ioctl = fs3270_ioctl, /* ioctl */ 521 .compat_ioctl = fs3270_ioctl, /* ioctl */ 522 .open = fs3270_open, /* open */ 523 .release = fs3270_close, /* release */ 524 .llseek = no_llseek, 525 }; 526 527 /* 528 * 3270 fullscreen driver initialization. 529 */ 530 static int __init 531 fs3270_init(void) 532 { 533 int rc; 534 535 rc = register_chrdev(IBM_FS3270_MAJOR, "fs3270", &fs3270_fops); 536 if (rc) 537 return rc; 538 return 0; 539 } 540 541 static void __exit 542 fs3270_exit(void) 543 { 544 unregister_chrdev(IBM_FS3270_MAJOR, "fs3270"); 545 } 546 547 MODULE_LICENSE("GPL"); 548 MODULE_ALIAS_CHARDEV_MAJOR(IBM_FS3270_MAJOR); 549 550 module_init(fs3270_init); 551 module_exit(fs3270_exit); 552