1 /** 2 * ipoctal.c 3 * 4 * driver for the GE IP-OCTAL boards 5 * 6 * Copyright (C) 2009-2012 CERN (www.cern.ch) 7 * Author: Nicolas Serafini, EIC2 SA 8 * Author: Samuel Iglesias Gonsalvez <siglesias@igalia.com> 9 * 10 * This program is free software; you can redistribute it and/or modify it 11 * under the terms of the GNU General Public License as published by the Free 12 * Software Foundation; version 2 of the License. 13 */ 14 15 #include <linux/device.h> 16 #include <linux/module.h> 17 #include <linux/interrupt.h> 18 #include <linux/sched.h> 19 #include <linux/tty.h> 20 #include <linux/serial.h> 21 #include <linux/tty_flip.h> 22 #include <linux/slab.h> 23 #include <linux/atomic.h> 24 #include <linux/io.h> 25 #include "../ipack.h" 26 #include "ipoctal.h" 27 #include "scc2698.h" 28 29 #define IP_OCTAL_ID_SPACE_VECTOR 0x41 30 #define IP_OCTAL_NB_BLOCKS 4 31 32 static const struct tty_operations ipoctal_fops; 33 34 struct ipoctal_channel { 35 struct ipoctal_stats stats; 36 unsigned int nb_bytes; 37 wait_queue_head_t queue; 38 spinlock_t lock; 39 unsigned int pointer_read; 40 unsigned int pointer_write; 41 atomic_t open; 42 struct tty_port tty_port; 43 union scc2698_channel __iomem *regs; 44 union scc2698_block __iomem *block_regs; 45 unsigned int board_id; 46 unsigned char *board_write; 47 u8 isr_rx_rdy_mask; 48 u8 isr_tx_rdy_mask; 49 }; 50 51 struct ipoctal { 52 struct ipack_device *dev; 53 unsigned int board_id; 54 struct ipoctal_channel channel[NR_CHANNELS]; 55 unsigned char write; 56 struct tty_driver *tty_drv; 57 u8 __iomem *mem8_space; 58 u8 __iomem *int_space; 59 }; 60 61 static int ipoctal_port_activate(struct tty_port *port, struct tty_struct *tty) 62 { 63 struct ipoctal_channel *channel; 64 65 channel = dev_get_drvdata(tty->dev); 66 67 iowrite8(CR_ENABLE_RX, &channel->regs->w.cr); 68 return 0; 69 } 70 71 static int ipoctal_open(struct tty_struct *tty, struct file *file) 72 { 73 int res; 74 struct ipoctal_channel *channel; 75 76 channel = dev_get_drvdata(tty->dev); 77 78 if (atomic_read(&channel->open)) 79 return -EBUSY; 80 81 tty->driver_data = channel; 82 83 res = tty_port_open(&channel->tty_port, tty, file); 84 if (res) 85 return res; 86 87 atomic_inc(&channel->open); 88 return 0; 89 } 90 91 static void ipoctal_reset_stats(struct ipoctal_stats *stats) 92 { 93 stats->tx = 0; 94 stats->rx = 0; 95 stats->rcv_break = 0; 96 stats->framing_err = 0; 97 stats->overrun_err = 0; 98 stats->parity_err = 0; 99 } 100 101 static void ipoctal_free_channel(struct ipoctal_channel *channel) 102 { 103 ipoctal_reset_stats(&channel->stats); 104 channel->pointer_read = 0; 105 channel->pointer_write = 0; 106 channel->nb_bytes = 0; 107 } 108 109 static void ipoctal_close(struct tty_struct *tty, struct file *filp) 110 { 111 struct ipoctal_channel *channel = tty->driver_data; 112 113 tty_port_close(&channel->tty_port, tty, filp); 114 115 if (atomic_dec_and_test(&channel->open)) 116 ipoctal_free_channel(channel); 117 } 118 119 static int ipoctal_get_icount(struct tty_struct *tty, 120 struct serial_icounter_struct *icount) 121 { 122 struct ipoctal_channel *channel = tty->driver_data; 123 124 icount->cts = 0; 125 icount->dsr = 0; 126 icount->rng = 0; 127 icount->dcd = 0; 128 icount->rx = channel->stats.rx; 129 icount->tx = channel->stats.tx; 130 icount->frame = channel->stats.framing_err; 131 icount->parity = channel->stats.parity_err; 132 icount->brk = channel->stats.rcv_break; 133 return 0; 134 } 135 136 static void ipoctal_irq_rx(struct ipoctal_channel *channel, 137 struct tty_struct *tty, u8 sr) 138 { 139 unsigned char value; 140 unsigned char flag = TTY_NORMAL; 141 u8 isr; 142 143 do { 144 value = ioread8(&channel->regs->r.rhr); 145 /* Error: count statistics */ 146 if (sr & SR_ERROR) { 147 iowrite8(CR_CMD_RESET_ERR_STATUS, &channel->regs->w.cr); 148 149 if (sr & SR_OVERRUN_ERROR) { 150 channel->stats.overrun_err++; 151 /* Overrun doesn't affect the current character*/ 152 tty_insert_flip_char(tty, 0, TTY_OVERRUN); 153 } 154 if (sr & SR_PARITY_ERROR) { 155 channel->stats.parity_err++; 156 flag = TTY_PARITY; 157 } 158 if (sr & SR_FRAMING_ERROR) { 159 channel->stats.framing_err++; 160 flag = TTY_FRAME; 161 } 162 if (sr & SR_RECEIVED_BREAK) { 163 iowrite8(CR_CMD_RESET_BREAK_CHANGE, &channel->regs->w.cr); 164 channel->stats.rcv_break++; 165 flag = TTY_BREAK; 166 } 167 } 168 tty_insert_flip_char(tty, value, flag); 169 170 /* Check if there are more characters in RX FIFO 171 * If there are more, the isr register for this channel 172 * has enabled the RxRDY|FFULL bit. 173 */ 174 isr = ioread8(&channel->block_regs->r.isr); 175 sr = ioread8(&channel->regs->r.sr); 176 } while (isr & channel->isr_rx_rdy_mask); 177 178 tty_flip_buffer_push(tty); 179 } 180 181 static void ipoctal_irq_tx(struct ipoctal_channel *channel) 182 { 183 unsigned char value; 184 unsigned int *pointer_write = &channel->pointer_write; 185 186 if (channel->nb_bytes <= 0) { 187 channel->nb_bytes = 0; 188 return; 189 } 190 191 value = channel->tty_port.xmit_buf[*pointer_write]; 192 iowrite8(value, &channel->regs->w.thr); 193 channel->stats.tx++; 194 (*pointer_write)++; 195 *pointer_write = *pointer_write % PAGE_SIZE; 196 channel->nb_bytes--; 197 198 if ((channel->nb_bytes == 0) && 199 (waitqueue_active(&channel->queue))) { 200 201 if (channel->board_id != IPACK1_DEVICE_ID_SBS_OCTAL_485) { 202 *channel->board_write = 1; 203 wake_up_interruptible(&channel->queue); 204 } 205 } 206 } 207 208 static void ipoctal_irq_channel(struct ipoctal_channel *channel) 209 { 210 u8 isr, sr; 211 struct tty_struct *tty; 212 213 /* If there is no client, skip the check */ 214 if (!atomic_read(&channel->open)) 215 return; 216 217 tty = tty_port_tty_get(&channel->tty_port); 218 if (!tty) 219 return; 220 /* The HW is organized in pair of channels. See which register we need 221 * to read from */ 222 isr = ioread8(&channel->block_regs->r.isr); 223 sr = ioread8(&channel->regs->r.sr); 224 225 /* In case of RS-485, change from TX to RX when finishing TX. 226 * Half-duplex. */ 227 if ((channel->board_id == IPACK1_DEVICE_ID_SBS_OCTAL_485) && 228 (sr & SR_TX_EMPTY) && (channel->nb_bytes == 0)) { 229 iowrite8(CR_DISABLE_TX, &channel->regs->w.cr); 230 iowrite8(CR_CMD_NEGATE_RTSN, &channel->regs->w.cr); 231 iowrite8(CR_ENABLE_RX, &channel->regs->w.cr); 232 *channel->board_write = 1; 233 wake_up_interruptible(&channel->queue); 234 } 235 236 /* RX data */ 237 if ((isr & channel->isr_rx_rdy_mask) && (sr & SR_RX_READY)) 238 ipoctal_irq_rx(channel, tty, sr); 239 240 /* TX of each character */ 241 if ((isr & channel->isr_tx_rdy_mask) && (sr & SR_TX_READY)) 242 ipoctal_irq_tx(channel); 243 244 tty_flip_buffer_push(tty); 245 tty_kref_put(tty); 246 } 247 248 static irqreturn_t ipoctal_irq_handler(void *arg) 249 { 250 unsigned int i; 251 struct ipoctal *ipoctal = (struct ipoctal *) arg; 252 253 /* Check all channels */ 254 for (i = 0; i < NR_CHANNELS; i++) 255 ipoctal_irq_channel(&ipoctal->channel[i]); 256 257 /* Clear the IPack device interrupt */ 258 readw(ipoctal->int_space + ACK_INT_REQ0); 259 readw(ipoctal->int_space + ACK_INT_REQ1); 260 261 return IRQ_HANDLED; 262 } 263 264 static const struct tty_port_operations ipoctal_tty_port_ops = { 265 .dtr_rts = NULL, 266 .activate = ipoctal_port_activate, 267 }; 268 269 static int ipoctal_inst_slot(struct ipoctal *ipoctal, unsigned int bus_nr, 270 unsigned int slot) 271 { 272 int res; 273 int i; 274 struct tty_driver *tty; 275 char name[20]; 276 struct ipoctal_channel *channel; 277 struct ipack_region *region; 278 void __iomem *addr; 279 union scc2698_channel __iomem *chan_regs; 280 union scc2698_block __iomem *block_regs; 281 282 ipoctal->board_id = ipoctal->dev->id_device; 283 284 region = &ipoctal->dev->region[IPACK_IO_SPACE]; 285 addr = devm_ioremap_nocache(&ipoctal->dev->dev, 286 region->start, region->size); 287 if (!addr) { 288 dev_err(&ipoctal->dev->dev, 289 "Unable to map slot [%d:%d] IO space!\n", 290 bus_nr, slot); 291 return -EADDRNOTAVAIL; 292 } 293 /* Save the virtual address to access the registers easily */ 294 chan_regs = 295 (union scc2698_channel __iomem *) addr; 296 block_regs = 297 (union scc2698_block __iomem *) addr; 298 299 region = &ipoctal->dev->region[IPACK_INT_SPACE]; 300 ipoctal->int_space = 301 devm_ioremap_nocache(&ipoctal->dev->dev, 302 region->start, region->size); 303 if (!ipoctal->int_space) { 304 dev_err(&ipoctal->dev->dev, 305 "Unable to map slot [%d:%d] INT space!\n", 306 bus_nr, slot); 307 return -EADDRNOTAVAIL; 308 } 309 310 region = &ipoctal->dev->region[IPACK_MEM8_SPACE]; 311 ipoctal->mem8_space = 312 devm_ioremap_nocache(&ipoctal->dev->dev, 313 region->start, 0x8000); 314 if (!addr) { 315 dev_err(&ipoctal->dev->dev, 316 "Unable to map slot [%d:%d] MEM8 space!\n", 317 bus_nr, slot); 318 return -EADDRNOTAVAIL; 319 } 320 321 322 /* Disable RX and TX before touching anything */ 323 for (i = 0; i < NR_CHANNELS ; i++) { 324 struct ipoctal_channel *channel = &ipoctal->channel[i]; 325 channel->regs = chan_regs + i; 326 channel->block_regs = block_regs + (i >> 1); 327 channel->board_write = &ipoctal->write; 328 channel->board_id = ipoctal->board_id; 329 if (i & 1) { 330 channel->isr_tx_rdy_mask = ISR_TxRDY_B; 331 channel->isr_rx_rdy_mask = ISR_RxRDY_FFULL_B; 332 } else { 333 channel->isr_tx_rdy_mask = ISR_TxRDY_A; 334 channel->isr_rx_rdy_mask = ISR_RxRDY_FFULL_A; 335 } 336 337 iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr); 338 iowrite8(CR_CMD_RESET_RX, &channel->regs->w.cr); 339 iowrite8(CR_CMD_RESET_TX, &channel->regs->w.cr); 340 iowrite8(MR1_CHRL_8_BITS | MR1_ERROR_CHAR | MR1_RxINT_RxRDY, 341 &channel->regs->w.mr); /* mr1 */ 342 iowrite8(0, &channel->regs->w.mr); /* mr2 */ 343 iowrite8(TX_CLK_9600 | RX_CLK_9600, &channel->regs->w.csr); 344 } 345 346 for (i = 0; i < IP_OCTAL_NB_BLOCKS; i++) { 347 iowrite8(ACR_BRG_SET2, &block_regs[i].w.acr); 348 iowrite8(OPCR_MPP_OUTPUT | OPCR_MPOa_RTSN | OPCR_MPOb_RTSN, 349 &block_regs[i].w.opcr); 350 iowrite8(IMR_TxRDY_A | IMR_RxRDY_FFULL_A | IMR_DELTA_BREAK_A | 351 IMR_TxRDY_B | IMR_RxRDY_FFULL_B | IMR_DELTA_BREAK_B, 352 &block_regs[i].w.imr); 353 } 354 355 /* 356 * IP-OCTAL has different addresses to copy its IRQ vector. 357 * Depending of the carrier these addresses are accesible or not. 358 * More info in the datasheet. 359 */ 360 ipoctal->dev->bus->ops->request_irq(ipoctal->dev, 361 ipoctal_irq_handler, ipoctal); 362 /* Dummy write */ 363 iowrite8(1, ipoctal->mem8_space + 1); 364 365 /* Register the TTY device */ 366 367 /* Each IP-OCTAL channel is a TTY port */ 368 tty = alloc_tty_driver(NR_CHANNELS); 369 370 if (!tty) 371 return -ENOMEM; 372 373 /* Fill struct tty_driver with ipoctal data */ 374 tty->owner = THIS_MODULE; 375 tty->driver_name = KBUILD_MODNAME; 376 sprintf(name, KBUILD_MODNAME ".%d.%d.", bus_nr, slot); 377 tty->name = name; 378 tty->major = 0; 379 380 tty->minor_start = 0; 381 tty->type = TTY_DRIVER_TYPE_SERIAL; 382 tty->subtype = SERIAL_TYPE_NORMAL; 383 tty->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV; 384 tty->init_termios = tty_std_termios; 385 tty->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; 386 tty->init_termios.c_ispeed = 9600; 387 tty->init_termios.c_ospeed = 9600; 388 389 tty_set_operations(tty, &ipoctal_fops); 390 res = tty_register_driver(tty); 391 if (res) { 392 dev_err(&ipoctal->dev->dev, "Can't register tty driver.\n"); 393 put_tty_driver(tty); 394 return res; 395 } 396 397 /* Save struct tty_driver for use it when uninstalling the device */ 398 ipoctal->tty_drv = tty; 399 400 for (i = 0; i < NR_CHANNELS; i++) { 401 struct device *tty_dev; 402 403 channel = &ipoctal->channel[i]; 404 tty_port_init(&channel->tty_port); 405 tty_port_alloc_xmit_buf(&channel->tty_port); 406 channel->tty_port.ops = &ipoctal_tty_port_ops; 407 408 ipoctal_reset_stats(&channel->stats); 409 channel->nb_bytes = 0; 410 init_waitqueue_head(&channel->queue); 411 412 spin_lock_init(&channel->lock); 413 channel->pointer_read = 0; 414 channel->pointer_write = 0; 415 tty_dev = tty_port_register_device(&channel->tty_port, tty, i, NULL); 416 if (IS_ERR(tty_dev)) { 417 dev_err(&ipoctal->dev->dev, "Failed to register tty device.\n"); 418 continue; 419 } 420 dev_set_drvdata(tty_dev, channel); 421 422 /* 423 * Enable again the RX. TX will be enabled when 424 * there is something to send 425 */ 426 iowrite8(CR_ENABLE_RX, &channel->regs->w.cr); 427 } 428 429 return 0; 430 } 431 432 static inline int ipoctal_copy_write_buffer(struct ipoctal_channel *channel, 433 const unsigned char *buf, 434 int count) 435 { 436 unsigned long flags; 437 int i; 438 unsigned int *pointer_read = &channel->pointer_read; 439 440 /* Copy the bytes from the user buffer to the internal one */ 441 for (i = 0; i < count; i++) { 442 if (i <= (PAGE_SIZE - channel->nb_bytes)) { 443 spin_lock_irqsave(&channel->lock, flags); 444 channel->tty_port.xmit_buf[*pointer_read] = buf[i]; 445 *pointer_read = (*pointer_read + 1) % PAGE_SIZE; 446 channel->nb_bytes++; 447 spin_unlock_irqrestore(&channel->lock, flags); 448 } else { 449 break; 450 } 451 } 452 return i; 453 } 454 455 static int ipoctal_write_tty(struct tty_struct *tty, 456 const unsigned char *buf, int count) 457 { 458 struct ipoctal_channel *channel = tty->driver_data; 459 unsigned int char_copied; 460 461 char_copied = ipoctal_copy_write_buffer(channel, buf, count); 462 463 /* As the IP-OCTAL 485 only supports half duplex, do it manually */ 464 if (channel->board_id == IPACK1_DEVICE_ID_SBS_OCTAL_485) { 465 iowrite8(CR_DISABLE_RX, &channel->regs->w.cr); 466 iowrite8(CR_CMD_ASSERT_RTSN, &channel->regs->w.cr); 467 } 468 469 /* 470 * Send a packet and then disable TX to avoid failure after several send 471 * operations 472 */ 473 iowrite8(CR_ENABLE_TX, &channel->regs->w.cr); 474 wait_event_interruptible(channel->queue, *channel->board_write); 475 iowrite8(CR_DISABLE_TX, &channel->regs->w.cr); 476 477 *channel->board_write = 0; 478 return char_copied; 479 } 480 481 static int ipoctal_write_room(struct tty_struct *tty) 482 { 483 struct ipoctal_channel *channel = tty->driver_data; 484 485 return PAGE_SIZE - channel->nb_bytes; 486 } 487 488 static int ipoctal_chars_in_buffer(struct tty_struct *tty) 489 { 490 struct ipoctal_channel *channel = tty->driver_data; 491 492 return channel->nb_bytes; 493 } 494 495 static void ipoctal_set_termios(struct tty_struct *tty, 496 struct ktermios *old_termios) 497 { 498 unsigned int cflag; 499 unsigned char mr1 = 0; 500 unsigned char mr2 = 0; 501 unsigned char csr = 0; 502 struct ipoctal_channel *channel = tty->driver_data; 503 speed_t baud; 504 505 cflag = tty->termios.c_cflag; 506 507 /* Disable and reset everything before change the setup */ 508 iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr); 509 iowrite8(CR_CMD_RESET_RX, &channel->regs->w.cr); 510 iowrite8(CR_CMD_RESET_TX, &channel->regs->w.cr); 511 iowrite8(CR_CMD_RESET_ERR_STATUS, &channel->regs->w.cr); 512 iowrite8(CR_CMD_RESET_MR, &channel->regs->w.cr); 513 514 /* Set Bits per chars */ 515 switch (cflag & CSIZE) { 516 case CS6: 517 mr1 |= MR1_CHRL_6_BITS; 518 break; 519 case CS7: 520 mr1 |= MR1_CHRL_7_BITS; 521 break; 522 case CS8: 523 default: 524 mr1 |= MR1_CHRL_8_BITS; 525 /* By default, select CS8 */ 526 tty->termios.c_cflag = (cflag & ~CSIZE) | CS8; 527 break; 528 } 529 530 /* Set Parity */ 531 if (cflag & PARENB) 532 if (cflag & PARODD) 533 mr1 |= MR1_PARITY_ON | MR1_PARITY_ODD; 534 else 535 mr1 |= MR1_PARITY_ON | MR1_PARITY_EVEN; 536 else 537 mr1 |= MR1_PARITY_OFF; 538 539 /* Mark or space parity is not supported */ 540 tty->termios.c_cflag &= ~CMSPAR; 541 542 /* Set stop bits */ 543 if (cflag & CSTOPB) 544 mr2 |= MR2_STOP_BITS_LENGTH_2; 545 else 546 mr2 |= MR2_STOP_BITS_LENGTH_1; 547 548 /* Set the flow control */ 549 switch (channel->board_id) { 550 case IPACK1_DEVICE_ID_SBS_OCTAL_232: 551 if (cflag & CRTSCTS) { 552 mr1 |= MR1_RxRTS_CONTROL_ON; 553 mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_ON; 554 } else { 555 mr1 |= MR1_RxRTS_CONTROL_OFF; 556 mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_OFF; 557 } 558 break; 559 case IPACK1_DEVICE_ID_SBS_OCTAL_422: 560 mr1 |= MR1_RxRTS_CONTROL_OFF; 561 mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_OFF; 562 break; 563 case IPACK1_DEVICE_ID_SBS_OCTAL_485: 564 mr1 |= MR1_RxRTS_CONTROL_OFF; 565 mr2 |= MR2_TxRTS_CONTROL_ON | MR2_CTS_ENABLE_TX_OFF; 566 break; 567 default: 568 return; 569 break; 570 } 571 572 baud = tty_get_baud_rate(tty); 573 tty_termios_encode_baud_rate(&tty->termios, baud, baud); 574 575 /* Set baud rate */ 576 switch (baud) { 577 case 75: 578 csr |= TX_CLK_75 | RX_CLK_75; 579 break; 580 case 110: 581 csr |= TX_CLK_110 | RX_CLK_110; 582 break; 583 case 150: 584 csr |= TX_CLK_150 | RX_CLK_150; 585 break; 586 case 300: 587 csr |= TX_CLK_300 | RX_CLK_300; 588 break; 589 case 600: 590 csr |= TX_CLK_600 | RX_CLK_600; 591 break; 592 case 1200: 593 csr |= TX_CLK_1200 | RX_CLK_1200; 594 break; 595 case 1800: 596 csr |= TX_CLK_1800 | RX_CLK_1800; 597 break; 598 case 2000: 599 csr |= TX_CLK_2000 | RX_CLK_2000; 600 break; 601 case 2400: 602 csr |= TX_CLK_2400 | RX_CLK_2400; 603 break; 604 case 4800: 605 csr |= TX_CLK_4800 | RX_CLK_4800; 606 break; 607 case 9600: 608 csr |= TX_CLK_9600 | RX_CLK_9600; 609 break; 610 case 19200: 611 csr |= TX_CLK_19200 | RX_CLK_19200; 612 break; 613 case 38400: 614 default: 615 csr |= TX_CLK_38400 | RX_CLK_38400; 616 /* In case of default, we establish 38400 bps */ 617 tty_termios_encode_baud_rate(&tty->termios, 38400, 38400); 618 break; 619 } 620 621 mr1 |= MR1_ERROR_CHAR; 622 mr1 |= MR1_RxINT_RxRDY; 623 624 /* Write the control registers */ 625 iowrite8(mr1, &channel->regs->w.mr); 626 iowrite8(mr2, &channel->regs->w.mr); 627 iowrite8(csr, &channel->regs->w.csr); 628 629 /* Enable again the RX */ 630 iowrite8(CR_ENABLE_RX, &channel->regs->w.cr); 631 } 632 633 static void ipoctal_hangup(struct tty_struct *tty) 634 { 635 unsigned long flags; 636 struct ipoctal_channel *channel = tty->driver_data; 637 638 if (channel == NULL) 639 return; 640 641 spin_lock_irqsave(&channel->lock, flags); 642 channel->nb_bytes = 0; 643 channel->pointer_read = 0; 644 channel->pointer_write = 0; 645 spin_unlock_irqrestore(&channel->lock, flags); 646 647 tty_port_hangup(&channel->tty_port); 648 649 iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr); 650 iowrite8(CR_CMD_RESET_RX, &channel->regs->w.cr); 651 iowrite8(CR_CMD_RESET_TX, &channel->regs->w.cr); 652 iowrite8(CR_CMD_RESET_ERR_STATUS, &channel->regs->w.cr); 653 iowrite8(CR_CMD_RESET_MR, &channel->regs->w.cr); 654 655 clear_bit(ASYNCB_INITIALIZED, &channel->tty_port.flags); 656 wake_up_interruptible(&channel->tty_port.open_wait); 657 } 658 659 static const struct tty_operations ipoctal_fops = { 660 .ioctl = NULL, 661 .open = ipoctal_open, 662 .close = ipoctal_close, 663 .write = ipoctal_write_tty, 664 .set_termios = ipoctal_set_termios, 665 .write_room = ipoctal_write_room, 666 .chars_in_buffer = ipoctal_chars_in_buffer, 667 .get_icount = ipoctal_get_icount, 668 .hangup = ipoctal_hangup, 669 }; 670 671 static int ipoctal_probe(struct ipack_device *dev) 672 { 673 int res; 674 struct ipoctal *ipoctal; 675 676 ipoctal = kzalloc(sizeof(struct ipoctal), GFP_KERNEL); 677 if (ipoctal == NULL) 678 return -ENOMEM; 679 680 ipoctal->dev = dev; 681 res = ipoctal_inst_slot(ipoctal, dev->bus->bus_nr, dev->slot); 682 if (res) 683 goto out_uninst; 684 685 dev_set_drvdata(&dev->dev, ipoctal); 686 return 0; 687 688 out_uninst: 689 kfree(ipoctal); 690 return res; 691 } 692 693 static void __ipoctal_remove(struct ipoctal *ipoctal) 694 { 695 int i; 696 697 ipoctal->dev->bus->ops->free_irq(ipoctal->dev); 698 699 for (i = 0; i < NR_CHANNELS; i++) { 700 struct ipoctal_channel *channel = &ipoctal->channel[i]; 701 tty_unregister_device(ipoctal->tty_drv, i); 702 tty_port_free_xmit_buf(&channel->tty_port); 703 } 704 705 tty_unregister_driver(ipoctal->tty_drv); 706 put_tty_driver(ipoctal->tty_drv); 707 kfree(ipoctal); 708 } 709 710 static void ipoctal_remove(struct ipack_device *idev) 711 { 712 __ipoctal_remove(dev_get_drvdata(&idev->dev)); 713 } 714 715 static DEFINE_IPACK_DEVICE_TABLE(ipoctal_ids) = { 716 { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS, 717 IPACK1_DEVICE_ID_SBS_OCTAL_232) }, 718 { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS, 719 IPACK1_DEVICE_ID_SBS_OCTAL_422) }, 720 { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS, 721 IPACK1_DEVICE_ID_SBS_OCTAL_485) }, 722 { 0, }, 723 }; 724 725 MODULE_DEVICE_TABLE(ipack, ipoctal_ids); 726 727 static const struct ipack_driver_ops ipoctal_drv_ops = { 728 .probe = ipoctal_probe, 729 .remove = ipoctal_remove, 730 }; 731 732 static struct ipack_driver driver = { 733 .ops = &ipoctal_drv_ops, 734 .id_table = ipoctal_ids, 735 }; 736 737 static int __init ipoctal_init(void) 738 { 739 return ipack_driver_register(&driver, THIS_MODULE, KBUILD_MODNAME); 740 } 741 742 static void __exit ipoctal_exit(void) 743 { 744 ipack_driver_unregister(&driver); 745 } 746 747 MODULE_DESCRIPTION("IP-Octal 232, 422 and 485 device driver"); 748 MODULE_LICENSE("GPL"); 749 750 module_init(ipoctal_init); 751 module_exit(ipoctal_exit); 752