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 = tty_alloc_driver(NR_CHANNELS, TTY_DRIVER_REAL_RAW | 351 TTY_DRIVER_DYNAMIC_DEV); 352 if (IS_ERR(tty)) 353 return PTR_ERR(tty); 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->init_termios = tty_std_termios; 366 tty->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL; 367 tty->init_termios.c_ispeed = 9600; 368 tty->init_termios.c_ospeed = 9600; 369 370 tty_set_operations(tty, &ipoctal_fops); 371 res = tty_register_driver(tty); 372 if (res) { 373 dev_err(&ipoctal->dev->dev, "Can't register tty driver.\n"); 374 tty_driver_kref_put(tty); 375 return res; 376 } 377 378 /* Save struct tty_driver for use it when uninstalling the device */ 379 ipoctal->tty_drv = tty; 380 381 for (i = 0; i < NR_CHANNELS; i++) { 382 struct device *tty_dev; 383 384 channel = &ipoctal->channel[i]; 385 tty_port_init(&channel->tty_port); 386 tty_port_alloc_xmit_buf(&channel->tty_port); 387 channel->tty_port.ops = &ipoctal_tty_port_ops; 388 389 ipoctal_reset_stats(&channel->stats); 390 channel->nb_bytes = 0; 391 spin_lock_init(&channel->lock); 392 channel->pointer_read = 0; 393 channel->pointer_write = 0; 394 tty_dev = tty_port_register_device(&channel->tty_port, tty, i, NULL); 395 if (IS_ERR(tty_dev)) { 396 dev_err(&ipoctal->dev->dev, "Failed to register tty device.\n"); 397 tty_port_destroy(&channel->tty_port); 398 continue; 399 } 400 dev_set_drvdata(tty_dev, channel); 401 } 402 403 /* 404 * IP-OCTAL has different addresses to copy its IRQ vector. 405 * Depending of the carrier these addresses are accesible or not. 406 * More info in the datasheet. 407 */ 408 ipoctal->dev->bus->ops->request_irq(ipoctal->dev, 409 ipoctal_irq_handler, ipoctal); 410 411 return 0; 412 } 413 414 static inline int ipoctal_copy_write_buffer(struct ipoctal_channel *channel, 415 const unsigned char *buf, 416 int count) 417 { 418 unsigned long flags; 419 int i; 420 unsigned int *pointer_read = &channel->pointer_read; 421 422 /* Copy the bytes from the user buffer to the internal one */ 423 for (i = 0; i < count; i++) { 424 if (i <= (PAGE_SIZE - channel->nb_bytes)) { 425 spin_lock_irqsave(&channel->lock, flags); 426 channel->tty_port.xmit_buf[*pointer_read] = buf[i]; 427 *pointer_read = (*pointer_read + 1) % PAGE_SIZE; 428 channel->nb_bytes++; 429 spin_unlock_irqrestore(&channel->lock, flags); 430 } else { 431 break; 432 } 433 } 434 return i; 435 } 436 437 static int ipoctal_write_tty(struct tty_struct *tty, 438 const unsigned char *buf, int count) 439 { 440 struct ipoctal_channel *channel = tty->driver_data; 441 unsigned int char_copied; 442 443 char_copied = ipoctal_copy_write_buffer(channel, buf, count); 444 445 /* As the IP-OCTAL 485 only supports half duplex, do it manually */ 446 if (channel->board_id == IPACK1_DEVICE_ID_SBS_OCTAL_485) { 447 iowrite8(CR_DISABLE_RX, &channel->regs->w.cr); 448 channel->rx_enable = 0; 449 iowrite8(CR_CMD_ASSERT_RTSN, &channel->regs->w.cr); 450 } 451 452 /* 453 * Send a packet and then disable TX to avoid failure after several send 454 * operations 455 */ 456 iowrite8(CR_ENABLE_TX, &channel->regs->w.cr); 457 return char_copied; 458 } 459 460 static unsigned int ipoctal_write_room(struct tty_struct *tty) 461 { 462 struct ipoctal_channel *channel = tty->driver_data; 463 464 return PAGE_SIZE - channel->nb_bytes; 465 } 466 467 static unsigned int ipoctal_chars_in_buffer(struct tty_struct *tty) 468 { 469 struct ipoctal_channel *channel = tty->driver_data; 470 471 return channel->nb_bytes; 472 } 473 474 static void ipoctal_set_termios(struct tty_struct *tty, 475 struct ktermios *old_termios) 476 { 477 unsigned int cflag; 478 unsigned char mr1 = 0; 479 unsigned char mr2 = 0; 480 unsigned char csr = 0; 481 struct ipoctal_channel *channel = tty->driver_data; 482 speed_t baud; 483 484 cflag = tty->termios.c_cflag; 485 486 /* Disable and reset everything before change the setup */ 487 ipoctal_reset_channel(channel); 488 489 /* Set Bits per chars */ 490 switch (cflag & CSIZE) { 491 case CS6: 492 mr1 |= MR1_CHRL_6_BITS; 493 break; 494 case CS7: 495 mr1 |= MR1_CHRL_7_BITS; 496 break; 497 case CS8: 498 default: 499 mr1 |= MR1_CHRL_8_BITS; 500 /* By default, select CS8 */ 501 tty->termios.c_cflag = (cflag & ~CSIZE) | CS8; 502 break; 503 } 504 505 /* Set Parity */ 506 if (cflag & PARENB) 507 if (cflag & PARODD) 508 mr1 |= MR1_PARITY_ON | MR1_PARITY_ODD; 509 else 510 mr1 |= MR1_PARITY_ON | MR1_PARITY_EVEN; 511 else 512 mr1 |= MR1_PARITY_OFF; 513 514 /* Mark or space parity is not supported */ 515 tty->termios.c_cflag &= ~CMSPAR; 516 517 /* Set stop bits */ 518 if (cflag & CSTOPB) 519 mr2 |= MR2_STOP_BITS_LENGTH_2; 520 else 521 mr2 |= MR2_STOP_BITS_LENGTH_1; 522 523 /* Set the flow control */ 524 switch (channel->board_id) { 525 case IPACK1_DEVICE_ID_SBS_OCTAL_232: 526 if (cflag & CRTSCTS) { 527 mr1 |= MR1_RxRTS_CONTROL_ON; 528 mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_ON; 529 } else { 530 mr1 |= MR1_RxRTS_CONTROL_OFF; 531 mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_OFF; 532 } 533 break; 534 case IPACK1_DEVICE_ID_SBS_OCTAL_422: 535 mr1 |= MR1_RxRTS_CONTROL_OFF; 536 mr2 |= MR2_TxRTS_CONTROL_OFF | MR2_CTS_ENABLE_TX_OFF; 537 break; 538 case IPACK1_DEVICE_ID_SBS_OCTAL_485: 539 mr1 |= MR1_RxRTS_CONTROL_OFF; 540 mr2 |= MR2_TxRTS_CONTROL_ON | MR2_CTS_ENABLE_TX_OFF; 541 break; 542 default: 543 return; 544 } 545 546 baud = tty_get_baud_rate(tty); 547 tty_termios_encode_baud_rate(&tty->termios, baud, baud); 548 549 /* Set baud rate */ 550 switch (baud) { 551 case 75: 552 csr |= TX_CLK_75 | RX_CLK_75; 553 break; 554 case 110: 555 csr |= TX_CLK_110 | RX_CLK_110; 556 break; 557 case 150: 558 csr |= TX_CLK_150 | RX_CLK_150; 559 break; 560 case 300: 561 csr |= TX_CLK_300 | RX_CLK_300; 562 break; 563 case 600: 564 csr |= TX_CLK_600 | RX_CLK_600; 565 break; 566 case 1200: 567 csr |= TX_CLK_1200 | RX_CLK_1200; 568 break; 569 case 1800: 570 csr |= TX_CLK_1800 | RX_CLK_1800; 571 break; 572 case 2000: 573 csr |= TX_CLK_2000 | RX_CLK_2000; 574 break; 575 case 2400: 576 csr |= TX_CLK_2400 | RX_CLK_2400; 577 break; 578 case 4800: 579 csr |= TX_CLK_4800 | RX_CLK_4800; 580 break; 581 case 9600: 582 csr |= TX_CLK_9600 | RX_CLK_9600; 583 break; 584 case 19200: 585 csr |= TX_CLK_19200 | RX_CLK_19200; 586 break; 587 case 38400: 588 default: 589 csr |= TX_CLK_38400 | RX_CLK_38400; 590 /* In case of default, we establish 38400 bps */ 591 tty_termios_encode_baud_rate(&tty->termios, 38400, 38400); 592 break; 593 } 594 595 mr1 |= MR1_ERROR_CHAR; 596 mr1 |= MR1_RxINT_RxRDY; 597 598 /* Write the control registers */ 599 iowrite8(mr1, &channel->regs->w.mr); 600 iowrite8(mr2, &channel->regs->w.mr); 601 iowrite8(csr, &channel->regs->w.csr); 602 603 /* Enable again the RX, if it was before */ 604 if (channel->rx_enable) 605 iowrite8(CR_ENABLE_RX, &channel->regs->w.cr); 606 } 607 608 static void ipoctal_hangup(struct tty_struct *tty) 609 { 610 unsigned long flags; 611 struct ipoctal_channel *channel = tty->driver_data; 612 613 if (channel == NULL) 614 return; 615 616 spin_lock_irqsave(&channel->lock, flags); 617 channel->nb_bytes = 0; 618 channel->pointer_read = 0; 619 channel->pointer_write = 0; 620 spin_unlock_irqrestore(&channel->lock, flags); 621 622 tty_port_hangup(&channel->tty_port); 623 624 ipoctal_reset_channel(channel); 625 tty_port_set_initialized(&channel->tty_port, 0); 626 wake_up_interruptible(&channel->tty_port.open_wait); 627 } 628 629 static void ipoctal_shutdown(struct tty_struct *tty) 630 { 631 struct ipoctal_channel *channel = tty->driver_data; 632 633 if (channel == NULL) 634 return; 635 636 ipoctal_reset_channel(channel); 637 tty_port_set_initialized(&channel->tty_port, 0); 638 } 639 640 static void ipoctal_cleanup(struct tty_struct *tty) 641 { 642 struct ipoctal_channel *channel = tty->driver_data; 643 struct ipoctal *ipoctal = chan_to_ipoctal(channel, tty->index); 644 645 /* release the carrier driver */ 646 ipack_put_carrier(ipoctal->dev); 647 } 648 649 static const struct tty_operations ipoctal_fops = { 650 .ioctl = NULL, 651 .open = ipoctal_open, 652 .close = ipoctal_close, 653 .write = ipoctal_write_tty, 654 .set_termios = ipoctal_set_termios, 655 .write_room = ipoctal_write_room, 656 .chars_in_buffer = ipoctal_chars_in_buffer, 657 .get_icount = ipoctal_get_icount, 658 .hangup = ipoctal_hangup, 659 .shutdown = ipoctal_shutdown, 660 .cleanup = ipoctal_cleanup, 661 }; 662 663 static int ipoctal_probe(struct ipack_device *dev) 664 { 665 int res; 666 struct ipoctal *ipoctal; 667 668 ipoctal = kzalloc(sizeof(struct ipoctal), GFP_KERNEL); 669 if (ipoctal == NULL) 670 return -ENOMEM; 671 672 ipoctal->dev = dev; 673 res = ipoctal_inst_slot(ipoctal, dev->bus->bus_nr, dev->slot); 674 if (res) 675 goto out_uninst; 676 677 dev_set_drvdata(&dev->dev, ipoctal); 678 return 0; 679 680 out_uninst: 681 kfree(ipoctal); 682 return res; 683 } 684 685 static void __ipoctal_remove(struct ipoctal *ipoctal) 686 { 687 int i; 688 689 ipoctal->dev->bus->ops->free_irq(ipoctal->dev); 690 691 for (i = 0; i < NR_CHANNELS; i++) { 692 struct ipoctal_channel *channel = &ipoctal->channel[i]; 693 tty_unregister_device(ipoctal->tty_drv, i); 694 tty_port_free_xmit_buf(&channel->tty_port); 695 tty_port_destroy(&channel->tty_port); 696 } 697 698 tty_unregister_driver(ipoctal->tty_drv); 699 tty_driver_kref_put(ipoctal->tty_drv); 700 kfree(ipoctal); 701 } 702 703 static void ipoctal_remove(struct ipack_device *idev) 704 { 705 __ipoctal_remove(dev_get_drvdata(&idev->dev)); 706 } 707 708 static DEFINE_IPACK_DEVICE_TABLE(ipoctal_ids) = { 709 { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS, 710 IPACK1_DEVICE_ID_SBS_OCTAL_232) }, 711 { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS, 712 IPACK1_DEVICE_ID_SBS_OCTAL_422) }, 713 { IPACK_DEVICE(IPACK_ID_VERSION_1, IPACK1_VENDOR_ID_SBS, 714 IPACK1_DEVICE_ID_SBS_OCTAL_485) }, 715 { 0, }, 716 }; 717 718 MODULE_DEVICE_TABLE(ipack, ipoctal_ids); 719 720 static const struct ipack_driver_ops ipoctal_drv_ops = { 721 .probe = ipoctal_probe, 722 .remove = ipoctal_remove, 723 }; 724 725 static struct ipack_driver driver = { 726 .ops = &ipoctal_drv_ops, 727 .id_table = ipoctal_ids, 728 }; 729 730 static int __init ipoctal_init(void) 731 { 732 return ipack_driver_register(&driver, THIS_MODULE, KBUILD_MODNAME); 733 } 734 735 static void __exit ipoctal_exit(void) 736 { 737 ipack_driver_unregister(&driver); 738 } 739 740 MODULE_DESCRIPTION("IP-Octal 232, 422 and 485 device driver"); 741 MODULE_LICENSE("GPL"); 742 743 module_init(ipoctal_init); 744 module_exit(ipoctal_exit); 745