1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * driver for the GE IP-OCTAL boards 4 * 5 * Copyright (C) 2009-2012 CERN (www.cern.ch) 6 * Author: Nicolas Serafini, EIC2 SA 7 * Author: Samuel Iglesias Gonsalvez <siglesias@igalia.com> 8 */ 9 10#include <linux/device.h> 11#include <linux/module.h> 12#include <linux/interrupt.h> 13#include <linux/sched.h> 14#include <linux/tty.h> 15#include <linux/serial.h> 16#include <linux/tty_flip.h> 17#include <linux/slab.h> 18#include <linux/io.h> 19#include <linux/ipack.h> 20#include "ipoctal.h" 21#include "scc2698.h" 22 23#define IP_OCTAL_ID_SPACE_VECTOR 0x41 24#define IP_OCTAL_NB_BLOCKS 4 25 26static const struct tty_operations ipoctal_fops; 27 28struct ipoctal_channel { 29 struct ipoctal_stats stats; 30 unsigned int nb_bytes; 31 wait_queue_head_t queue; 32 spinlock_t lock; 33 unsigned int pointer_read; 34 unsigned int pointer_write; 35 struct tty_port tty_port; 36 bool tty_registered; 37 union scc2698_channel __iomem *regs; 38 union scc2698_block __iomem *block_regs; 39 unsigned int board_id; 40 u8 isr_rx_rdy_mask; 41 u8 isr_tx_rdy_mask; 42 unsigned int rx_enable; 43}; 44 45struct ipoctal { 46 struct ipack_device *dev; 47 unsigned int board_id; 48 struct ipoctal_channel channel[NR_CHANNELS]; 49 struct tty_driver *tty_drv; 50 u8 __iomem *mem8_space; 51 u8 __iomem *int_space; 52}; 53 54static inline struct ipoctal *chan_to_ipoctal(struct ipoctal_channel *chan, 55 unsigned int index) 56{ 57 return container_of(chan, struct ipoctal, channel[index]); 58} 59 60static void ipoctal_reset_channel(struct ipoctal_channel *channel) 61{ 62 iowrite8(CR_DISABLE_RX | CR_DISABLE_TX, &channel->regs->w.cr); 63 channel->rx_enable = 0; 64 iowrite8(CR_CMD_RESET_RX, &channel->regs->w.cr); 65 iowrite8(CR_CMD_RESET_TX, &channel->regs->w.cr); 66 iowrite8(CR_CMD_RESET_ERR_STATUS, &channel->regs->w.cr); 67 iowrite8(CR_CMD_RESET_MR, &channel->regs->w.cr); 68} 69 70static int ipoctal_port_activate(struct tty_port *port, struct tty_struct *tty) 71{ 72 struct ipoctal_channel *channel; 73 74 channel = dev_get_drvdata(tty->dev); 75 76 /* 77 * Enable RX. TX will be enabled when 78 * there is something to send 79 */ 80 iowrite8(CR_ENABLE_RX, &channel->regs->w.cr); 81 channel->rx_enable = 1; 82 return 0; 83} 84 85static int ipoctal_install(struct tty_driver *driver, struct tty_struct *tty) 86{ 87 struct ipoctal_channel *channel = dev_get_drvdata(tty->dev); 88 struct ipoctal *ipoctal = chan_to_ipoctal(channel, tty->index); 89 int res; 90 91 if (!ipack_get_carrier(ipoctal->dev)) 92 return -EBUSY; 93 94 res = tty_standard_install(driver, tty); 95 if (res) 96 goto err_put_carrier; 97 98 tty->driver_data = channel; 99 100 return 0; 101 102err_put_carrier: 103 ipack_put_carrier(ipoctal->dev); 104 105 return res; 106} 107 108static int ipoctal_open(struct tty_struct *tty, struct file *file) 109{ 110 struct ipoctal_channel *channel = tty->driver_data; 111 112 return tty_port_open(&channel->tty_port, tty, file); 113} 114 115static void ipoctal_reset_stats(struct ipoctal_stats *stats) 116{ 117 stats->tx = 0; 118 stats->rx = 0; 119 stats->rcv_break = 0; 120 stats->framing_err = 0; 121 stats->overrun_err = 0; 122 stats->parity_err = 0; 123} 124 125static void ipoctal_free_channel(struct ipoctal_channel *channel) 126{ 127 ipoctal_reset_stats(&channel->stats); 128 channel->pointer_read = 0; 129 channel->pointer_write = 0; 130 channel->nb_bytes = 0; 131} 132 133static void ipoctal_close(struct tty_struct *tty, struct file *filp) 134{ 135 struct ipoctal_channel *channel = tty->driver_data; 136 137 tty_port_close(&channel->tty_port, tty, filp); 138 ipoctal_free_channel(channel); 139} 140 141static int ipoctal_get_icount(struct tty_struct *tty, 142 struct serial_icounter_struct *icount) 143{ 144 struct ipoctal_channel *channel = tty->driver_data; 145 146 icount->cts = 0; 147 icount->dsr = 0; 148 icount->rng = 0; 149 icount->dcd = 0; 150 icount->rx = channel->stats.rx; 151 icount->tx = channel->stats.tx; 152 icount->frame = channel->stats.framing_err; 153 icount->parity = channel->stats.parity_err; 154 icount->brk = channel->stats.rcv_break; 155 return 0; 156} 157 158static void ipoctal_irq_rx(struct ipoctal_channel *channel, u8 sr) 159{ 160 struct tty_port *port = &channel->tty_port; 161 unsigned char value; 162 unsigned char flag; 163 u8 isr; 164 165 do { 166 value = ioread8(&channel->regs->r.rhr); 167 flag = TTY_NORMAL; 168 /* Error: count statistics */ 169 if (sr & SR_ERROR) { 170 iowrite8(CR_CMD_RESET_ERR_STATUS, &channel->regs->w.cr); 171 172 if (sr & SR_OVERRUN_ERROR) { 173 channel->stats.overrun_err++; 174 /* Overrun doesn't affect the current character*/ 175 tty_insert_flip_char(port, 0, TTY_OVERRUN); 176 } 177 if (sr & SR_PARITY_ERROR) { 178 channel->stats.parity_err++; 179 flag = TTY_PARITY; 180 } 181 if (sr & SR_FRAMING_ERROR) { 182 channel->stats.framing_err++; 183 flag = TTY_FRAME; 184 } 185 if (sr & SR_RECEIVED_BREAK) { 186 channel->stats.rcv_break++; 187 flag = TTY_BREAK; 188 } 189 } 190 tty_insert_flip_char(port, value, flag); 191 192 /* Check if there are more characters in RX FIFO 193 * If there are more, the isr register for this channel 194 * has enabled the RxRDY|FFULL bit. 195 */ 196 isr = ioread8(&channel->block_regs->r.isr); 197 sr = ioread8(&channel->regs->r.sr); 198 } while (isr & channel->isr_rx_rdy_mask); 199 200 tty_flip_buffer_push(port); 201} 202 203static void ipoctal_irq_tx(struct ipoctal_channel *channel) 204{ 205 unsigned char value; 206 unsigned int *pointer_write = &channel->pointer_write; 207 208 if (channel->nb_bytes == 0) 209 return; 210 211 spin_lock(&channel->lock); 212 value = channel->tty_port.xmit_buf[*pointer_write]; 213 iowrite8(value, &channel->regs->w.thr); 214 channel->stats.tx++; 215 (*pointer_write)++; 216 *pointer_write = *pointer_write % PAGE_SIZE; 217 channel->nb_bytes--; 218 spin_unlock(&channel->lock); 219} 220 221static void ipoctal_irq_channel(struct ipoctal_channel *channel) 222{ 223 u8 isr, sr; 224 225 /* The HW is organized in pair of channels. See which register we need 226 * to read from */ 227 isr = ioread8(&channel->block_regs->r.isr); 228 sr = ioread8(&channel->regs->r.sr); 229 230 if (isr & (IMR_DELTA_BREAK_A | IMR_DELTA_BREAK_B)) 231 iowrite8(CR_CMD_RESET_BREAK_CHANGE, &channel->regs->w.cr); 232 233 if ((sr & SR_TX_EMPTY) && (channel->nb_bytes == 0)) { 234 iowrite8(CR_DISABLE_TX, &channel->regs->w.cr); 235 /* In case of RS-485, change from TX to RX when finishing TX. 236 * Half-duplex. */ 237 if (channel->board_id == IPACK1_DEVICE_ID_SBS_OCTAL_485) { 238 iowrite8(CR_CMD_NEGATE_RTSN, &channel->regs->w.cr); 239 iowrite8(CR_ENABLE_RX, &channel->regs->w.cr); 240 channel->rx_enable = 1; 241 } 242 } 243 244 /* RX data */ 245 if ((isr & channel->isr_rx_rdy_mask) && (sr & SR_RX_READY)) 246 ipoctal_irq_rx(channel, sr); 247 248 /* TX of each character */ 249 if ((isr & channel->isr_tx_rdy_mask) && (sr & SR_TX_READY)) 250 ipoctal_irq_tx(channel); 251} 252 253static irqreturn_t ipoctal_irq_handler(void *arg) 254{ 255 unsigned int i; 256 struct ipoctal *ipoctal = arg; 257 258 /* Clear the IPack device interrupt */ 259 readw(ipoctal->int_space + ACK_INT_REQ0); 260 readw(ipoctal->int_space + ACK_INT_REQ1); 261 262 /* Check all channels */ 263 for (i = 0; i < NR_CHANNELS; i++) 264 ipoctal_irq_channel(&ipoctal->channel[i]); 265 266 return IRQ_HANDLED; 267} 268 269static const struct tty_port_operations ipoctal_tty_port_ops = { 270 .dtr_rts = NULL, 271 .activate = ipoctal_port_activate, 272}; 273 274static int ipoctal_inst_slot(struct ipoctal *ipoctal, unsigned int bus_nr, 275 unsigned int slot) 276{ 277 int res; 278 int i; 279 struct tty_driver *drv; 280 struct ipoctal_channel *channel; 281 struct ipack_region *region; 282 void __iomem *addr; 283 union scc2698_channel __iomem *chan_regs; 284 union scc2698_block __iomem *block_regs; 285 286 ipoctal->board_id = ipoctal->dev->id_device; 287 288 region = &ipoctal->dev->region[IPACK_IO_SPACE]; 289 addr = devm_ioremap(&ipoctal->dev->dev, 290 region->start, region->size); 291 if (!addr) { 292 dev_err(&ipoctal->dev->dev, 293 "Unable to map slot [%d:%d] IO space!\n", 294 bus_nr, slot); 295 return -EADDRNOTAVAIL; 296 } 297 /* Save the virtual address to access the registers easily */ 298 chan_regs = 299 (union scc2698_channel __iomem *) addr; 300 block_regs = 301 (union scc2698_block __iomem *) addr; 302 303 region = &ipoctal->dev->region[IPACK_INT_SPACE]; 304 ipoctal->int_space = 305 devm_ioremap(&ipoctal->dev->dev, 306 region->start, region->size); 307 if (!ipoctal->int_space) { 308 dev_err(&ipoctal->dev->dev, 309 "Unable to map slot [%d:%d] INT space!\n", 310 bus_nr, slot); 311 return -EADDRNOTAVAIL; 312 } 313 314 region = &ipoctal->dev->region[IPACK_MEM8_SPACE]; 315 ipoctal->mem8_space = 316 devm_ioremap(&ipoctal->dev->dev, 317 region->start, 0x8000); 318 if (!ipoctal->mem8_space) { 319 dev_err(&ipoctal->dev->dev, 320 "Unable to map slot [%d:%d] MEM8 space!\n", 321 bus_nr, slot); 322 return -EADDRNOTAVAIL; 323 } 324 325 326 /* Disable RX and TX before touching anything */ 327 for (i = 0; i < NR_CHANNELS ; i++) { 328 struct ipoctal_channel *channel = &ipoctal->channel[i]; 329 channel->regs = chan_regs + i; 330 channel->block_regs = block_regs + (i >> 1); 331 channel->board_id = ipoctal->board_id; 332 if (i & 1) { 333 channel->isr_tx_rdy_mask = ISR_TxRDY_B; 334 channel->isr_rx_rdy_mask = ISR_RxRDY_FFULL_B; 335 } else { 336 channel->isr_tx_rdy_mask = ISR_TxRDY_A; 337 channel->isr_rx_rdy_mask = ISR_RxRDY_FFULL_A; 338 } 339 340 ipoctal_reset_channel(channel); 341 iowrite8(MR1_CHRL_8_BITS | MR1_ERROR_CHAR | MR1_RxINT_RxRDY, 342 &channel->regs->w.mr); /* mr1 */ 343 iowrite8(0, &channel->regs->w.mr); /* mr2 */ 344 iowrite8(TX_CLK_9600 | RX_CLK_9600, &channel->regs->w.csr); 345 } 346 347 for (i = 0; i < IP_OCTAL_NB_BLOCKS; i++) { 348 iowrite8(ACR_BRG_SET2, &block_regs[i].w.acr); 349 iowrite8(OPCR_MPP_OUTPUT | OPCR_MPOa_RTSN | OPCR_MPOb_RTSN, 350 &block_regs[i].w.opcr); 351 iowrite8(IMR_TxRDY_A | IMR_RxRDY_FFULL_A | IMR_DELTA_BREAK_A | 352 IMR_TxRDY_B | IMR_RxRDY_FFULL_B | IMR_DELTA_BREAK_B, 353 &block_regs[i].w.imr); 354 } 355 356 /* Dummy write */ 357 iowrite8(1, ipoctal->mem8_space + 1); 358 359 /* Register the TTY device */ 360 361 /* Each IP-OCTAL channel is a TTY port */ 362 drv = tty_alloc_driver(NR_CHANNELS, TTY_DRIVER_REAL_RAW | 363 TTY_DRIVER_DYNAMIC_DEV); 364 if (IS_ERR(drv)) 365 return PTR_ERR(drv); 366 367 /* Fill struct tty_driver with ipoctal data */ 368 drv->owner = THIS_MODULE; 369 drv->driver_name = KBUILD_MODNAME; 370 drv->name = kasprintf(GFP_KERNEL, KBUILD_MODNAME ".%d.%d.", bus_nr, slot); 371 if (!drv->name) { 372 res = -ENOMEM; 373 goto err_put_driver; 374 } 375 drv->major = 0; 376 377 drv->minor_start = 0; 378 drv->type = TTY_DRIVER_TYPE_SERIAL; 379 drv->subtype = SERIAL_TYPE_NORMAL; 380 drv->init_termios = tty_std_termios; 381 drv->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; 382 drv->init_termios.c_ispeed = 9600; 383 drv->init_termios.c_ospeed = 9600; 384 385 tty_set_operations(drv, &ipoctal_fops); 386 res = tty_register_driver(drv); 387 if (res) { 388 dev_err(&ipoctal->dev->dev, "Can't register tty driver.\n"); 389 goto err_free_name; 390 } 391 392 /* Save struct tty_driver for use it when uninstalling the device */ 393 ipoctal->tty_drv = drv; 394 395 for (i = 0; i < NR_CHANNELS; i++) { 396 struct device *tty_dev; 397 398 channel = &ipoctal->channel[i]; 399 tty_port_init(&channel->tty_port); 400 res = tty_port_alloc_xmit_buf(&channel->tty_port); 401 if (res) 402 continue; 403 channel->tty_port.ops = &ipoctal_tty_port_ops; 404 405 ipoctal_reset_stats(&channel->stats); 406 channel->nb_bytes = 0; 407 spin_lock_init(&channel->lock); 408 channel->pointer_read = 0; 409 channel->pointer_write = 0; 410 tty_dev = tty_port_register_device_attr(&channel->tty_port, drv, 411 i, NULL, channel, NULL); 412 if (IS_ERR(tty_dev)) { 413 dev_err(&ipoctal->dev->dev, "Failed to register tty device.\n"); 414 tty_port_free_xmit_buf(&channel->tty_port); 415 tty_port_destroy(&channel->tty_port); 416 continue; 417 } 418 channel->tty_registered = true; 419 } 420 421 /* 422 * IP-OCTAL has different addresses to copy its IRQ vector. 423 * Depending of the carrier these addresses are accesible or not. 424 * More info in the datasheet. 425 */ 426 ipoctal->dev->bus->ops->request_irq(ipoctal->dev, 427 ipoctal_irq_handler, ipoctal); 428 429 return 0; 430 431err_free_name: 432 kfree(drv->name); 433err_put_driver: 434 tty_driver_kref_put(drv); 435 436 return res; 437} 438 439static inline int ipoctal_copy_write_buffer(struct ipoctal_channel *channel, 440 const u8 *buf, int count) 441{ 442 unsigned long flags; 443 int i; 444 unsigned int *pointer_read = &channel->pointer_read; 445 446 /* Copy the bytes from the user buffer to the internal one */ 447 for (i = 0; i < count; i++) { 448 if (i <= (PAGE_SIZE - channel->nb_bytes)) { 449 spin_lock_irqsave(&channel->lock, flags); 450 channel->tty_port.xmit_buf[*pointer_read] = buf[i]; 451 *pointer_read = (*pointer_read + 1) % PAGE_SIZE; 452 channel->nb_bytes++; 453 spin_unlock_irqrestore(&channel->lock, flags); 454 } else { 455 break; 456 } 457 } 458 return i; 459} 460 461static ssize_t ipoctal_write_tty(struct tty_struct *tty, const u8 *buf, 462 size_t count) 463{ 464 struct ipoctal_channel *channel = tty->driver_data; 465 unsigned int char_copied; 466 467 char_copied = ipoctal_copy_write_buffer(channel, buf, count); 468 469 /* As the IP-OCTAL 485 only supports half duplex, do it manually */ 470 if (channel->board_id == IPACK1_DEVICE_ID_SBS_OCTAL_485) { 471 iowrite8(CR_DISABLE_RX, &channel->regs->w.cr); 472 channel->rx_enable = 0; 473 iowrite8(CR_CMD_ASSERT_RTSN, &channel->regs->w.cr); 474 } 475 476 /* 477 * Send a packet and then disable TX to avoid failure after several send 478 * operations 479 */ 480 iowrite8(CR_ENABLE_TX, &channel->regs->w.cr); 481 return char_copied; 482} 483 484static unsigned int ipoctal_write_room(struct tty_struct *tty) 485{ 486 struct ipoctal_channel *channel = tty->driver_data; 487 488 return PAGE_SIZE - channel->nb_bytes; 489} 490 491static unsigned int ipoctal_chars_in_buffer(struct tty_struct *tty) 492{ 493 struct ipoctal_channel *channel = tty->driver_data; 494 495 return channel->nb_bytes; 496} 497 498static void ipoctal_set_termios(struct tty_struct *tty, 499 const struct ktermios *old_termios) 500{ 501 unsigned int cflag; 502 unsigned char mr1 = 0; 503 unsigned char mr2 = 0; 504 unsigned char csr = 0; 505 struct ipoctal_channel *channel = tty->driver_data; 506 speed_t baud; 507 508 cflag = tty->termios.c_cflag; 509 510 /* Disable and reset everything before change the setup */ 511 ipoctal_reset_channel(channel); 512 513 /* Set Bits per chars */ 514 switch (cflag & CSIZE) { 515 case CS6: 516 mr1 |= MR1_CHRL_6_BITS; 517 break; 518 case CS7: 519 mr1 |= MR1_CHRL_7_BITS; 520 break; 521 case CS8: 522 default: 523 mr1 |= MR1_CHRL_8_BITS; 524 /* By default, select CS8 */ 525 tty->termios.c_cflag = (cflag & ~CSIZE) | CS8; 526 break; 527 } 528 529 /* Set Parity */ 530 if (cflag & PARENB) 531 if (cflag & PARODD) 532 mr1 |= MR1_PARITY_ON | MR1_PARITY_ODD; 533 else 534 mr1 |= MR1_PARITY_ON | MR1_PARITY_EVEN; 535 else 536 mr1 |= MR1_PARITY_OFF; 537 538 /* Mark or space parity is not supported */ 539 tty->termios.c_cflag &= ~CMSPAR; 540 541 /* Set stop bits */ 542 if (cflag & CSTOPB) 543 mr2 |= MR2_STOP_BITS_LENGTH_2; 544 else 545 mr2 |= MR2_STOP_BITS_LENGTH_1; 546 547 /* Set the flow control */ 548 switch (channel->board_id) { 549 case IPACK1_DEVICE_ID_SBS_OCTAL_232: 550 if (cflag & CRTSCTS) { 551 mr1 |= MR1_RxRTS_CONTROL_ON; 552 mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_ON; 553 } else { 554 mr1 |= MR1_RxRTS_CONTROL_OFF; 555 mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_OFF; 556 } 557 break; 558 case IPACK1_DEVICE_ID_SBS_OCTAL_422: 559 mr1 |= MR1_RxRTS_CONTROL_OFF; 560 mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_OFF; 561 break; 562 case IPACK1_DEVICE_ID_SBS_OCTAL_485: 563 mr1 |= MR1_RxRTS_CONTROL_OFF; 564 mr2 |= MR2_TxRTS_CONTROL_ON | MR2_CTS_ENABLE_TX_OFF; 565 break; 566 default: 567 return; 568 } 569 570 baud = tty_get_baud_rate(tty); 571 tty_termios_encode_baud_rate(&tty->termios, baud, baud); 572 573 /* Set baud rate */ 574 switch (baud) { 575 case 75: 576 csr |= TX_CLK_75 | RX_CLK_75; 577 break; 578 case 110: 579 csr |= TX_CLK_110 | RX_CLK_110; 580 break; 581 case 150: 582 csr |= TX_CLK_150 | RX_CLK_150; 583 break; 584 case 300: 585 csr |= TX_CLK_300 | RX_CLK_300; 586 break; 587 case 600: 588 csr |= TX_CLK_600 | RX_CLK_600; 589 break; 590 case 1200: 591 csr |= TX_CLK_1200 | RX_CLK_1200; 592 break; 593 case 1800: 594 csr |= TX_CLK_1800 | RX_CLK_1800; 595 break; 596 case 2000: 597 csr |= TX_CLK_2000 | RX_CLK_2000; 598 break; 599 case 2400: 600 csr |= TX_CLK_2400 | RX_CLK_2400; 601 break; 602 case 4800: 603 csr |= TX_CLK_4800 | RX_CLK_4800; 604 break; 605 case 9600: 606 csr |= TX_CLK_9600 | RX_CLK_9600; 607 break; 608 case 19200: 609 csr |= TX_CLK_19200 | RX_CLK_19200; 610 break; 611 case 38400: 612 default: 613 csr |= TX_CLK_38400 | RX_CLK_38400; 614 /* In case of default, we establish 38400 bps */ 615 tty_termios_encode_baud_rate(&tty->termios, 38400, 38400); 616 break; 617 } 618 619 mr1 |= MR1_ERROR_CHAR; 620 mr1 |= MR1_RxINT_RxRDY; 621 622 /* Write the control registers */ 623 iowrite8(mr1, &channel->regs->w.mr); 624 iowrite8(mr2, &channel->regs->w.mr); 625 iowrite8(csr, &channel->regs->w.csr); 626 627 /* Enable again the RX, if it was before */ 628 if (channel->rx_enable) 629 iowrite8(CR_ENABLE_RX, &channel->regs->w.cr); 630} 631 632static void ipoctal_hangup(struct tty_struct *tty) 633{ 634 unsigned long flags; 635 struct ipoctal_channel *channel = tty->driver_data; 636 637 if (channel == NULL) 638 return; 639 640 spin_lock_irqsave(&channel->lock, flags); 641 channel->nb_bytes = 0; 642 channel->pointer_read = 0; 643 channel->pointer_write = 0; 644 spin_unlock_irqrestore(&channel->lock, flags); 645 646 tty_port_hangup(&channel->tty_port); 647 648 ipoctal_reset_channel(channel); 649 tty_port_set_initialized(&channel->tty_port, false); 650 wake_up_interruptible(&channel->tty_port.open_wait); 651} 652 653static void ipoctal_shutdown(struct tty_struct *tty) 654{ 655 struct ipoctal_channel *channel = tty->driver_data; 656 657 if (channel == NULL) 658 return; 659 660 ipoctal_reset_channel(channel); 661 tty_port_set_initialized(&channel->tty_port, false); 662} 663 664static void ipoctal_cleanup(struct tty_struct *tty) 665{ 666 struct ipoctal_channel *channel = tty->driver_data; 667 struct ipoctal *ipoctal = chan_to_ipoctal(channel, tty->index); 668 669 /* release the carrier driver */ 670 ipack_put_carrier(ipoctal->dev); 671} 672 673static const struct tty_operations ipoctal_fops = { 674 .ioctl = NULL, 675 .install = ipoctal_install, 676 .open = ipoctal_open, 677 .close = ipoctal_close, 678 .write = ipoctal_write_tty, 679 .set_termios = ipoctal_set_termios, 680 .write_room = ipoctal_write_room, 681 .chars_in_buffer = ipoctal_chars_in_buffer, 682 .get_icount = ipoctal_get_icount, 683 .hangup = ipoctal_hangup, 684 .shutdown = ipoctal_shutdown, 685 .cleanup = ipoctal_cleanup, 686}; 687 688static int ipoctal_probe(struct ipack_device *dev) 689{ 690 int res; 691 struct ipoctal *ipoctal; 692 693 ipoctal = kzalloc(sizeof(struct ipoctal), GFP_KERNEL); 694 if (ipoctal == NULL) 695 return -ENOMEM; 696 697 ipoctal->dev = dev; 698 res = ipoctal_inst_slot(ipoctal, dev->bus->bus_nr, dev->slot); 699 if (res) 700 goto out_uninst; 701 702 dev_set_drvdata(&dev->dev, ipoctal); 703 return 0; 704 705out_uninst: 706 kfree(ipoctal); 707 return res; 708} 709 710static void __ipoctal_remove(struct ipoctal *ipoctal) 711{ 712 int i; 713 714 ipoctal->dev->bus->ops->free_irq(ipoctal->dev); 715 716 for (i = 0; i < NR_CHANNELS; i++) { 717 struct ipoctal_channel *channel = &ipoctal->channel[i]; 718 719 if (!channel->tty_registered) 720 continue; 721 722 tty_unregister_device(ipoctal->tty_drv, i); 723 tty_port_free_xmit_buf(&channel->tty_port); 724 tty_port_destroy(&channel->tty_port); 725 } 726 727 tty_unregister_driver(ipoctal->tty_drv); 728 kfree(ipoctal->tty_drv->name); 729 tty_driver_kref_put(ipoctal->tty_drv); 730 kfree(ipoctal); 731} 732 733static void ipoctal_remove(struct ipack_device *idev) 734{ 735 __ipoctal_remove(dev_get_drvdata(&idev->dev)); 736} 737 738static DEFINE_IPACK_DEVICE_TABLE(ipoctal_ids) = { 739 { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS, 740 IPACK1_DEVICE_ID_SBS_OCTAL_232) }, 741 { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS, 742 IPACK1_DEVICE_ID_SBS_OCTAL_422) }, 743 { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS, 744 IPACK1_DEVICE_ID_SBS_OCTAL_485) }, 745 { 0, }, 746}; 747 748MODULE_DEVICE_TABLE(ipack, ipoctal_ids); 749 750static const struct ipack_driver_ops ipoctal_drv_ops = { 751 .probe = ipoctal_probe, 752 .remove = ipoctal_remove, 753}; 754 755static struct ipack_driver driver = { 756 .ops = &ipoctal_drv_ops, 757 .id_table = ipoctal_ids, 758}; 759 760static int __init ipoctal_init(void) 761{ 762 return ipack_driver_register(&driver, THIS_MODULE, KBUILD_MODNAME); 763} 764 765static void __exit ipoctal_exit(void) 766{ 767 ipack_driver_unregister(&driver); 768} 769 770MODULE_DESCRIPTION("IP-Octal 232, 422 and 485 device driver"); 771MODULE_LICENSE("GPL"); 772 773module_init(ipoctal_init); 774module_exit(ipoctal_exit); 775