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