drivers/staging/dgnc/dgnc_sysfs.c

   1 /*
   2  * Copyright 2004 Digi International (www.digi.com)
   3  *      Scott H Kilau <Scott_Kilau at digi dot com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2, or (at your option)
   8  * any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED; without even the
  12  * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
  13  * PURPOSE.  See the GNU General Public License for more details.
  14  */
  15
  16 #include <linux/kernel.h>
  17 #include <linux/module.h>
  18 #include <linux/ctype.h>
  19 #include <linux/string.h>
  20 #include <linux/serial_reg.h>
  21 #include <linux/device.h>
  22 #include <linux/pci.h>
  23 #include <linux/kdev_t.h>
  24
  25 #include "dgnc_driver.h"
  26 #include "dgnc_mgmt.h"
  27
  28 static ssize_t version_show(struct device_driver *ddp, char *buf)
  29 {
  30         return snprintf(buf, PAGE_SIZE, "%s\n", DG_PART);
  31 }
  32 static DRIVER_ATTR_RO(version);
  33
  34 static ssize_t boards_show(struct device_driver *ddp, char *buf)
  35 {
  36         return snprintf(buf, PAGE_SIZE, "%d\n", dgnc_num_boards);
  37 }
  38 static DRIVER_ATTR_RO(boards);
  39
  40 static ssize_t maxboards_show(struct device_driver *ddp, char *buf)
  41 {
  42         return snprintf(buf, PAGE_SIZE, "%d\n", MAXBOARDS);
  43 }
  44 static DRIVER_ATTR_RO(maxboards);
  45
  46 static ssize_t pollrate_show(struct device_driver *ddp, char *buf)
  47 {
  48         return snprintf(buf, PAGE_SIZE, "%dms\n", dgnc_poll_tick);
  49 }
  50
  51 static ssize_t pollrate_store(struct device_driver *ddp,
  52                               const char *buf, size_t count)
  53 {
  54         unsigned long flags;
  55         int tick;
  56         int ret;
  57
  58         ret = sscanf(buf, "%d\n", &tick);
  59         if (ret != 1)
  60                 return -EINVAL;
  61
  62         spin_lock_irqsave(&dgnc_poll_lock, flags);
  63         dgnc_poll_tick = tick;
  64         spin_unlock_irqrestore(&dgnc_poll_lock, flags);
  65
  66         return count;
  67 }
  68 static DRIVER_ATTR_RW(pollrate);
  69
  70 void dgnc_create_driver_sysfiles(struct pci_driver *dgnc_driver)
  71 {
  72         int rc = 0;
  73         struct device_driver *driverfs = &dgnc_driver->driver;
  74
  75         rc |= driver_create_file(driverfs, &driver_attr_version);
  76         rc |= driver_create_file(driverfs, &driver_attr_boards);
  77         rc |= driver_create_file(driverfs, &driver_attr_maxboards);
  78         rc |= driver_create_file(driverfs, &driver_attr_pollrate);
  79         if (rc)
  80                 pr_err("DGNC: sysfs driver_create_file failed!\n");
  81 }
  82
  83 void dgnc_remove_driver_sysfiles(struct pci_driver *dgnc_driver)
  84 {
  85         struct device_driver *driverfs = &dgnc_driver->driver;
  86
  87         driver_remove_file(driverfs, &driver_attr_version);
  88         driver_remove_file(driverfs, &driver_attr_boards);
  89         driver_remove_file(driverfs, &driver_attr_maxboards);
  90         driver_remove_file(driverfs, &driver_attr_pollrate);
  91 }
  92
  93 #define DGNC_VERIFY_BOARD(p, bd)                                \
  94         do {                                                    \
  95                 if (!p)                                         \
  96                         return 0;                               \
  97                                                                 \
  98                 bd = dev_get_drvdata(p);                        \
  99                 if (!bd || bd->magic != DGNC_BOARD_MAGIC)       \
 100                         return 0;                               \
 101                 if (bd->state != BOARD_READY)                   \
 102                         return 0;                               \
 103         } while (0)
 104
 105 static ssize_t vpd_show(struct device *p, struct device_attribute *attr,
 106                         char *buf)
 107 {
 108         struct dgnc_board *bd;
 109         int count = 0;
 110         int i = 0;
 111
 112         DGNC_VERIFY_BOARD(p, bd);
 113
 114         count += sprintf(buf + count,
 115                 "\n      0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F");
 116         for (i = 0; i < 0x40 * 2; i++) {
 117                 if (!(i % 16))
 118                         count += sprintf(buf + count, "\n%04X ", i * 2);
 119                 count += sprintf(buf + count, "%02X ", bd->vpd[i]);
 120         }
 121         count += sprintf(buf + count, "\n");
 122
 123         return count;
 124 }
 125 static DEVICE_ATTR_RO(vpd);
 126
 127 static ssize_t serial_number_show(struct device *p,
 128                                   struct device_attribute *attr, char *buf)
 129 {
 130         struct dgnc_board *bd;
 131         int count = 0;
 132
 133         DGNC_VERIFY_BOARD(p, bd);
 134
 135         if (bd->serial_num[0] == '\0')
 136                 count += sprintf(buf + count, "<UNKNOWN>\n");
 137         else
 138                 count += sprintf(buf + count, "%s\n", bd->serial_num);
 139
 140         return count;
 141 }
 142 static DEVICE_ATTR_RO(serial_number);
 143
 144 static ssize_t ports_state_show(struct device *p,
 145                                 struct device_attribute *attr, char *buf)
 146 {
 147         struct dgnc_board *bd;
 148         int count = 0;
 149         int i = 0;
 150
 151         DGNC_VERIFY_BOARD(p, bd);
 152
 153         for (i = 0; i < bd->nasync; i++) {
 154                 count += snprintf(buf + count, PAGE_SIZE - count,
 155                         "%d %s\n", bd->channels[i]->ch_portnum,
 156                         bd->channels[i]->ch_open_count ? "Open" : "Closed");
 157         }
 158         return count;
 159 }
 160 static DEVICE_ATTR_RO(ports_state);
 161
 162 static ssize_t ports_baud_show(struct device *p,
 163                                struct device_attribute *attr, char *buf)
 164 {
 165         struct dgnc_board *bd;
 166         int count = 0;
 167         int i = 0;
 168
 169         DGNC_VERIFY_BOARD(p, bd);
 170
 171         for (i = 0; i < bd->nasync; i++) {
 172                 count +=  snprintf(buf + count, PAGE_SIZE - count,
 173                         "%d %d\n", bd->channels[i]->ch_portnum,
 174                         bd->channels[i]->ch_old_baud);
 175         }
 176         return count;
 177 }
 178 static DEVICE_ATTR_RO(ports_baud);
 179
 180 static ssize_t ports_msignals_show(struct device *p,
 181                                    struct device_attribute *attr, char *buf)
 182 {
 183         struct dgnc_board *bd;
 184         int count = 0;
 185         int i = 0;
 186
 187         DGNC_VERIFY_BOARD(p, bd);
 188
 189         for (i = 0; i < bd->nasync; i++) {
 190                 struct channel_t *ch = bd->channels[i];
 191
 192                 if (ch->ch_open_count) {
 193                         count += snprintf(buf + count, PAGE_SIZE - count,
 194                                 "%d %s %s %s %s %s %s\n",
 195                                 ch->ch_portnum,
 196                                 (ch->ch_mostat & UART_MCR_RTS) ? "RTS" : "",
 197                                 (ch->ch_mistat & UART_MSR_CTS) ? "CTS" : "",
 198                                 (ch->ch_mostat & UART_MCR_DTR) ? "DTR" : "",
 199                                 (ch->ch_mistat & UART_MSR_DSR) ? "DSR" : "",
 200                                 (ch->ch_mistat & UART_MSR_DCD) ? "DCD" : "",
 201                                 (ch->ch_mistat & UART_MSR_RI)  ? "RI"  : "");
 202                 } else {
 203                         count += snprintf(buf + count, PAGE_SIZE - count,
 204                                 "%d\n", ch->ch_portnum);
 205                 }
 206         }
 207         return count;
 208 }
 209 static DEVICE_ATTR_RO(ports_msignals);
 210
 211 static ssize_t ports_iflag_show(struct device *p,
 212                                 struct device_attribute *attr, char *buf)
 213 {
 214         struct dgnc_board *bd;
 215         int count = 0;
 216         int i = 0;
 217
 218         DGNC_VERIFY_BOARD(p, bd);
 219
 220         for (i = 0; i < bd->nasync; i++) {
 221                 count += snprintf(buf + count, PAGE_SIZE - count, "%d %x\n",
 222                         bd->channels[i]->ch_portnum,
 223                         bd->channels[i]->ch_c_iflag);
 224         }
 225         return count;
 226 }
 227 static DEVICE_ATTR_RO(ports_iflag);
 228
 229 static ssize_t ports_cflag_show(struct device *p,
 230                                 struct device_attribute *attr, char *buf)
 231 {
 232         struct dgnc_board *bd;
 233         int count = 0;
 234         int i = 0;
 235
 236         DGNC_VERIFY_BOARD(p, bd);
 237
 238         for (i = 0; i < bd->nasync; i++) {
 239                 count += snprintf(buf + count, PAGE_SIZE - count, "%d %x\n",
 240                         bd->channels[i]->ch_portnum,
 241                         bd->channels[i]->ch_c_cflag);
 242         }
 243         return count;
 244 }
 245 static DEVICE_ATTR_RO(ports_cflag);
 246
 247 static ssize_t ports_oflag_show(struct device *p,
 248                                 struct device_attribute *attr, char *buf)
 249 {
 250         struct dgnc_board *bd;
 251         int count = 0;
 252         int i = 0;
 253
 254         DGNC_VERIFY_BOARD(p, bd);
 255
 256         for (i = 0; i < bd->nasync; i++) {
 257                 count += snprintf(buf + count, PAGE_SIZE - count, "%d %x\n",
 258                         bd->channels[i]->ch_portnum,
 259                         bd->channels[i]->ch_c_oflag);
 260         }
 261         return count;
 262 }
 263 static DEVICE_ATTR_RO(ports_oflag);
 264
 265 static ssize_t ports_lflag_show(struct device *p,
 266                                 struct device_attribute *attr, char *buf)
 267 {
 268         struct dgnc_board *bd;
 269         int count = 0;
 270         int i = 0;
 271
 272         DGNC_VERIFY_BOARD(p, bd);
 273
 274         for (i = 0; i < bd->nasync; i++) {
 275                 count += snprintf(buf + count, PAGE_SIZE - count, "%d %x\n",
 276                         bd->channels[i]->ch_portnum,
 277                         bd->channels[i]->ch_c_lflag);
 278         }
 279         return count;
 280 }
 281 static DEVICE_ATTR_RO(ports_lflag);
 282
 283 static ssize_t ports_digi_flag_show(struct device *p,
 284                                     struct device_attribute *attr, char *buf)
 285 {
 286         struct dgnc_board *bd;
 287         int count = 0;
 288         int i = 0;
 289
 290         DGNC_VERIFY_BOARD(p, bd);
 291
 292         for (i = 0; i < bd->nasync; i++) {
 293                 count += snprintf(buf + count, PAGE_SIZE - count, "%d %x\n",
 294                         bd->channels[i]->ch_portnum,
 295                         bd->channels[i]->ch_digi.digi_flags);
 296         }
 297         return count;
 298 }
 299 static DEVICE_ATTR_RO(ports_digi_flag);
 300
 301 static ssize_t ports_rxcount_show(struct device *p,
 302                                   struct device_attribute *attr, char *buf)
 303 {
 304         struct dgnc_board *bd;
 305         int count = 0;
 306         int i = 0;
 307
 308         DGNC_VERIFY_BOARD(p, bd);
 309
 310         for (i = 0; i < bd->nasync; i++) {
 311                 count += snprintf(buf + count, PAGE_SIZE - count, "%d %ld\n",
 312                         bd->channels[i]->ch_portnum,
 313                         bd->channels[i]->ch_rxcount);
 314         }
 315         return count;
 316 }
 317 static DEVICE_ATTR_RO(ports_rxcount);
 318
 319 static ssize_t ports_txcount_show(struct device *p,
 320                                   struct device_attribute *attr, char *buf)
 321 {
 322         struct dgnc_board *bd;
 323         int count = 0;
 324         int i = 0;
 325
 326         DGNC_VERIFY_BOARD(p, bd);
 327
 328         for (i = 0; i < bd->nasync; i++) {
 329                 count += snprintf(buf + count, PAGE_SIZE - count, "%d %ld\n",
 330                         bd->channels[i]->ch_portnum,
 331                         bd->channels[i]->ch_txcount);
 332         }
 333         return count;
 334 }
 335 static DEVICE_ATTR_RO(ports_txcount);
 336
 337 /*
 338  * this function creates the sys files that will export each signal status
 339  * to sysfs each value will be put in a separate filename
 340  */
 341 void dgnc_create_ports_sysfiles(struct dgnc_board *bd)
 342 {
 343         int rc = 0;
 344
 345         dev_set_drvdata(&bd->pdev->dev, bd);
 346         rc |= device_create_file(&bd->pdev->dev, &dev_attr_ports_state);
 347         rc |= device_create_file(&bd->pdev->dev, &dev_attr_ports_baud);
 348         rc |= device_create_file(&bd->pdev->dev, &dev_attr_ports_msignals);
 349         rc |= device_create_file(&bd->pdev->dev, &dev_attr_ports_iflag);
 350         rc |= device_create_file(&bd->pdev->dev, &dev_attr_ports_cflag);
 351         rc |= device_create_file(&bd->pdev->dev, &dev_attr_ports_oflag);
 352         rc |= device_create_file(&bd->pdev->dev, &dev_attr_ports_lflag);
 353         rc |= device_create_file(&bd->pdev->dev, &dev_attr_ports_digi_flag);
 354         rc |= device_create_file(&bd->pdev->dev, &dev_attr_ports_rxcount);
 355         rc |= device_create_file(&bd->pdev->dev, &dev_attr_ports_txcount);
 356         rc |= device_create_file(&bd->pdev->dev, &dev_attr_vpd);
 357         rc |= device_create_file(&bd->pdev->dev, &dev_attr_serial_number);
 358         if (rc)
 359                 dev_err(&bd->pdev->dev, "dgnc: sysfs device_create_file failed!\n");
 360 }
 361
 362 /* removes all the sys files created for that port */
 363 void dgnc_remove_ports_sysfiles(struct dgnc_board *bd)
 364 {
 365         device_remove_file(&bd->pdev->dev, &dev_attr_ports_state);
 366         device_remove_file(&bd->pdev->dev, &dev_attr_ports_baud);
 367         device_remove_file(&bd->pdev->dev, &dev_attr_ports_msignals);
 368         device_remove_file(&bd->pdev->dev, &dev_attr_ports_iflag);
 369         device_remove_file(&bd->pdev->dev, &dev_attr_ports_cflag);
 370         device_remove_file(&bd->pdev->dev, &dev_attr_ports_oflag);
 371         device_remove_file(&bd->pdev->dev, &dev_attr_ports_lflag);
 372         device_remove_file(&bd->pdev->dev, &dev_attr_ports_digi_flag);
 373         device_remove_file(&bd->pdev->dev, &dev_attr_ports_rxcount);
 374         device_remove_file(&bd->pdev->dev, &dev_attr_ports_txcount);
 375         device_remove_file(&bd->pdev->dev, &dev_attr_vpd);
 376         device_remove_file(&bd->pdev->dev, &dev_attr_serial_number);
 377 }
 378
 379 static ssize_t tty_state_show(struct device *d,
 380                               struct device_attribute *attr, char *buf)
 381 {
 382         struct dgnc_board *bd;
 383         struct channel_t *ch;
 384         struct un_t *un;
 385
 386         if (!d)
 387                 return 0;
 388         un = dev_get_drvdata(d);
 389         if (!un || un->magic != DGNC_UNIT_MAGIC)
 390                 return 0;
 391         ch = un->un_ch;
 392         if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
 393                 return 0;
 394         bd = ch->ch_bd;
 395         if (!bd || bd->magic != DGNC_BOARD_MAGIC)
 396                 return 0;
 397         if (bd->state != BOARD_READY)
 398                 return 0;
 399
 400         return snprintf(buf, PAGE_SIZE, "%s",
 401                         un->un_open_count ? "Open" : "Closed");
 402 }
 403 static DEVICE_ATTR_RO(tty_state);
 404
 405 static ssize_t tty_baud_show(struct device *d,
 406                              struct device_attribute *attr, char *buf)
 407 {
 408         struct dgnc_board *bd;
 409         struct channel_t *ch;
 410         struct un_t *un;
 411
 412         if (!d)
 413                 return 0;
 414         un = dev_get_drvdata(d);
 415         if (!un || un->magic != DGNC_UNIT_MAGIC)
 416                 return 0;
 417         ch = un->un_ch;
 418         if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
 419                 return 0;
 420         bd = ch->ch_bd;
 421         if (!bd || bd->magic != DGNC_BOARD_MAGIC)
 422                 return 0;
 423         if (bd->state != BOARD_READY)
 424                 return 0;
 425
 426         return snprintf(buf, PAGE_SIZE, "%d\n", ch->ch_old_baud);
 427 }
 428 static DEVICE_ATTR_RO(tty_baud);
 429
 430 static ssize_t tty_msignals_show(struct device *d,
 431                                  struct device_attribute *attr, char *buf)
 432 {
 433         struct dgnc_board *bd;
 434         struct channel_t *ch;
 435         struct un_t *un;
 436
 437         if (!d)
 438                 return 0;
 439         un = dev_get_drvdata(d);
 440         if (!un || un->magic != DGNC_UNIT_MAGIC)
 441                 return 0;
 442         ch = un->un_ch;
 443         if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
 444                 return 0;
 445         bd = ch->ch_bd;
 446         if (!bd || bd->magic != DGNC_BOARD_MAGIC)
 447                 return 0;
 448         if (bd->state != BOARD_READY)
 449                 return 0;
 450
 451         if (ch->ch_open_count) {
 452                 return snprintf(buf, PAGE_SIZE, "%s %s %s %s %s %s\n",
 453                         (ch->ch_mostat & UART_MCR_RTS) ? "RTS" : "",
 454                         (ch->ch_mistat & UART_MSR_CTS) ? "CTS" : "",
 455                         (ch->ch_mostat & UART_MCR_DTR) ? "DTR" : "",
 456                         (ch->ch_mistat & UART_MSR_DSR) ? "DSR" : "",
 457                         (ch->ch_mistat & UART_MSR_DCD) ? "DCD" : "",
 458                         (ch->ch_mistat & UART_MSR_RI)  ? "RI"  : "");
 459         }
 460         return 0;
 461 }
 462 static DEVICE_ATTR_RO(tty_msignals);
 463
 464 static ssize_t tty_iflag_show(struct device *d,
 465                               struct device_attribute *attr, char *buf)
 466 {
 467         struct dgnc_board *bd;
 468         struct channel_t *ch;
 469         struct un_t *un;
 470
 471         if (!d)
 472                 return 0;
 473         un = dev_get_drvdata(d);
 474         if (!un || un->magic != DGNC_UNIT_MAGIC)
 475                 return 0;
 476         ch = un->un_ch;
 477         if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
 478                 return 0;
 479         bd = ch->ch_bd;
 480         if (!bd || bd->magic != DGNC_BOARD_MAGIC)
 481                 return 0;
 482         if (bd->state != BOARD_READY)
 483                 return 0;
 484
 485         return snprintf(buf, PAGE_SIZE, "%x\n", ch->ch_c_iflag);
 486 }
 487 static DEVICE_ATTR_RO(tty_iflag);
 488
 489 static ssize_t tty_cflag_show(struct device *d,
 490                               struct device_attribute *attr, char *buf)
 491 {
 492         struct dgnc_board *bd;
 493         struct channel_t *ch;
 494         struct un_t *un;
 495
 496         if (!d)
 497                 return 0;
 498         un = dev_get_drvdata(d);
 499         if (!un || un->magic != DGNC_UNIT_MAGIC)
 500                 return 0;
 501         ch = un->un_ch;
 502         if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
 503                 return 0;
 504         bd = ch->ch_bd;
 505         if (!bd || bd->magic != DGNC_BOARD_MAGIC)
 506                 return 0;
 507         if (bd->state != BOARD_READY)
 508                 return 0;
 509
 510         return snprintf(buf, PAGE_SIZE, "%x\n", ch->ch_c_cflag);
 511 }
 512 static DEVICE_ATTR_RO(tty_cflag);
 513
 514 static ssize_t tty_oflag_show(struct device *d,
 515                               struct device_attribute *attr, char *buf)
 516 {
 517         struct dgnc_board *bd;
 518         struct channel_t *ch;
 519         struct un_t *un;
 520
 521         if (!d)
 522                 return 0;
 523         un = dev_get_drvdata(d);
 524         if (!un || un->magic != DGNC_UNIT_MAGIC)
 525                 return 0;
 526         ch = un->un_ch;
 527         if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
 528                 return 0;
 529         bd = ch->ch_bd;
 530         if (!bd || bd->magic != DGNC_BOARD_MAGIC)
 531                 return 0;
 532         if (bd->state != BOARD_READY)
 533                 return 0;
 534
 535         return snprintf(buf, PAGE_SIZE, "%x\n", ch->ch_c_oflag);
 536 }
 537 static DEVICE_ATTR_RO(tty_oflag);
 538
 539 static ssize_t tty_lflag_show(struct device *d,
 540                               struct device_attribute *attr, char *buf)
 541 {
 542         struct dgnc_board *bd;
 543         struct channel_t *ch;
 544         struct un_t *un;
 545
 546         if (!d)
 547                 return 0;
 548         un = dev_get_drvdata(d);
 549         if (!un || un->magic != DGNC_UNIT_MAGIC)
 550                 return 0;
 551         ch = un->un_ch;
 552         if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
 553                 return 0;
 554         bd = ch->ch_bd;
 555         if (!bd || bd->magic != DGNC_BOARD_MAGIC)
 556                 return 0;
 557         if (bd->state != BOARD_READY)
 558                 return 0;
 559
 560         return snprintf(buf, PAGE_SIZE, "%x\n", ch->ch_c_lflag);
 561 }
 562 static DEVICE_ATTR_RO(tty_lflag);
 563
 564 static ssize_t tty_digi_flag_show(struct device *d,
 565                                   struct device_attribute *attr, char *buf)
 566 {
 567         struct dgnc_board *bd;
 568         struct channel_t *ch;
 569         struct un_t *un;
 570
 571         if (!d)
 572                 return 0;
 573         un = dev_get_drvdata(d);
 574         if (!un || un->magic != DGNC_UNIT_MAGIC)
 575                 return 0;
 576         ch = un->un_ch;
 577         if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
 578                 return 0;
 579         bd = ch->ch_bd;
 580         if (!bd || bd->magic != DGNC_BOARD_MAGIC)
 581                 return 0;
 582         if (bd->state != BOARD_READY)
 583                 return 0;
 584
 585         return snprintf(buf, PAGE_SIZE, "%x\n", ch->ch_digi.digi_flags);
 586 }
 587 static DEVICE_ATTR_RO(tty_digi_flag);
 588
 589 static ssize_t tty_rxcount_show(struct device *d,
 590                                 struct device_attribute *attr, char *buf)
 591 {
 592         struct dgnc_board *bd;
 593         struct channel_t *ch;
 594         struct un_t *un;
 595
 596         if (!d)
 597                 return 0;
 598         un = dev_get_drvdata(d);
 599         if (!un || un->magic != DGNC_UNIT_MAGIC)
 600                 return 0;
 601         ch = un->un_ch;
 602         if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
 603                 return 0;
 604         bd = ch->ch_bd;
 605         if (!bd || bd->magic != DGNC_BOARD_MAGIC)
 606                 return 0;
 607         if (bd->state != BOARD_READY)
 608                 return 0;
 609
 610         return snprintf(buf, PAGE_SIZE, "%ld\n", ch->ch_rxcount);
 611 }
 612 static DEVICE_ATTR_RO(tty_rxcount);
 613
 614 static ssize_t tty_txcount_show(struct device *d,
 615                                 struct device_attribute *attr, char *buf)
 616 {
 617         struct dgnc_board *bd;
 618         struct channel_t *ch;
 619         struct un_t *un;
 620
 621         if (!d)
 622                 return 0;
 623         un = dev_get_drvdata(d);
 624         if (!un || un->magic != DGNC_UNIT_MAGIC)
 625                 return 0;
 626         ch = un->un_ch;
 627         if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
 628                 return 0;
 629         bd = ch->ch_bd;
 630         if (!bd || bd->magic != DGNC_BOARD_MAGIC)
 631                 return 0;
 632         if (bd->state != BOARD_READY)
 633                 return 0;
 634
 635         return snprintf(buf, PAGE_SIZE, "%ld\n", ch->ch_txcount);
 636 }
 637 static DEVICE_ATTR_RO(tty_txcount);
 638
 639 static ssize_t tty_custom_name_show(struct device *d,
 640                                     struct device_attribute *attr, char *buf)
 641 {
 642         struct dgnc_board *bd;
 643         struct channel_t *ch;
 644         struct un_t *un;
 645
 646         if (!d)
 647                 return 0;
 648         un = dev_get_drvdata(d);
 649         if (!un || un->magic != DGNC_UNIT_MAGIC)
 650                 return 0;
 651         ch = un->un_ch;
 652         if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
 653                 return 0;
 654         bd = ch->ch_bd;
 655         if (!bd || bd->magic != DGNC_BOARD_MAGIC)
 656                 return 0;
 657         if (bd->state != BOARD_READY)
 658                 return 0;
 659
 660         return snprintf(buf, PAGE_SIZE, "%sn%d%c\n",
 661                 (un->un_type == DGNC_PRINT) ? "pr" : "tty",
 662                 bd->boardnum + 1, 'a' + ch->ch_portnum);
 663 }
 664 static DEVICE_ATTR_RO(tty_custom_name);
 665
 666 static struct attribute *dgnc_sysfs_tty_entries[] = {
 667         &dev_attr_tty_state.attr,
 668         &dev_attr_tty_baud.attr,
 669         &dev_attr_tty_msignals.attr,
 670         &dev_attr_tty_iflag.attr,
 671         &dev_attr_tty_cflag.attr,
 672         &dev_attr_tty_oflag.attr,
 673         &dev_attr_tty_lflag.attr,
 674         &dev_attr_tty_digi_flag.attr,
 675         &dev_attr_tty_rxcount.attr,
 676         &dev_attr_tty_txcount.attr,
 677         &dev_attr_tty_custom_name.attr,
 678         NULL
 679 };
 680
 681 static const struct attribute_group dgnc_tty_attribute_group = {
 682         .name = NULL,
 683         .attrs = dgnc_sysfs_tty_entries,
 684 };
 685
 686 void dgnc_create_tty_sysfs(struct un_t *un, struct device *c)
 687 {
 688         int ret;
 689
 690         ret = sysfs_create_group(&c->kobj, &dgnc_tty_attribute_group);
 691         if (ret) {
 692                 dev_err(c, "dgnc: failed to create sysfs tty device attributes.\n");
 693                 sysfs_remove_group(&c->kobj, &dgnc_tty_attribute_group);
 694                 return;
 695         }
 696
 697         dev_set_drvdata(c, un);
 698 }
 699
 700 void dgnc_remove_tty_sysfs(struct device *c)
 701 {
 702         sysfs_remove_group(&c->kobj, &dgnc_tty_attribute_group);
 703 }