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