1// SPDX-License-Identifier: GPL-2.0 2/* 3 * Ours Technology Inc. OTi-6858 USB to serial adapter driver. 4 * 5 * Copyleft (C) 2007 Kees Lemmens (adapted for kernel 2.6.20) 6 * Copyright (C) 2006 Tomasz Michal Lukaszewski (FIXME: add e-mail) 7 * Copyright (C) 2001-2004 Greg Kroah-Hartman (greg@kroah.com) 8 * Copyright (C) 2003 IBM Corp. 9 * 10 * Many thanks to the authors of pl2303 driver: all functions in this file 11 * are heavily based on pl2303 code, buffering code is a 1-to-1 copy. 12 * 13 * Warning! You use this driver on your own risk! The only official 14 * description of this device I have is datasheet from manufacturer, 15 * and it doesn't contain almost any information needed to write a driver. 16 * Almost all knowlegde used while writing this driver was gathered by: 17 * - analyzing traffic between device and the M$ Windows 2000 driver, 18 * - trying different bit combinations and checking pin states 19 * with a voltmeter, 20 * - receiving malformed frames and producing buffer overflows 21 * to learn how errors are reported, 22 * So, THIS CODE CAN DESTROY OTi-6858 AND ANY OTHER DEVICES, THAT ARE 23 * CONNECTED TO IT! 24 * 25 * See Documentation/usb/usb-serial.rst for more information on using this 26 * driver 27 * 28 * TODO: 29 * - implement correct flushing for ioctls and oti6858_close() 30 * - check how errors (rx overflow, parity error, framing error) are reported 31 * - implement oti6858_break_ctl() 32 * - implement more ioctls 33 * - test/implement flow control 34 * - allow setting custom baud rates 35 */ 36 37#include <linux/kernel.h> 38#include <linux/errno.h> 39#include <linux/slab.h> 40#include <linux/tty.h> 41#include <linux/tty_driver.h> 42#include <linux/tty_flip.h> 43#include <linux/serial.h> 44#include <linux/module.h> 45#include <linux/moduleparam.h> 46#include <linux/spinlock.h> 47#include <linux/usb.h> 48#include <linux/usb/serial.h> 49#include <linux/uaccess.h> 50#include <linux/kfifo.h> 51#include "oti6858.h" 52 53#define OTI6858_DESCRIPTION \ 54 "Ours Technology Inc. OTi-6858 USB to serial adapter driver" 55#define OTI6858_AUTHOR "Tomasz Michal Lukaszewski <FIXME@FIXME>" 56 57static const struct usb_device_id id_table[] = { 58 { USB_DEVICE(OTI6858_VENDOR_ID, OTI6858_PRODUCT_ID) }, 59 { } 60}; 61 62MODULE_DEVICE_TABLE(usb, id_table); 63 64/* requests */ 65#define OTI6858_REQ_GET_STATUS (USB_DIR_IN | USB_TYPE_VENDOR | 0x00) 66#define OTI6858_REQ_T_GET_STATUS 0x01 67 68#define OTI6858_REQ_SET_LINE (USB_DIR_OUT | USB_TYPE_VENDOR | 0x00) 69#define OTI6858_REQ_T_SET_LINE 0x00 70 71#define OTI6858_REQ_CHECK_TXBUFF (USB_DIR_IN | USB_TYPE_VENDOR | 0x01) 72#define OTI6858_REQ_T_CHECK_TXBUFF 0x00 73 74/* format of the control packet */ 75struct oti6858_control_pkt { 76 __le16 divisor; /* baud rate = 96000000 / (16 * divisor), LE */ 77#define OTI6858_MAX_BAUD_RATE 3000000 78 u8 frame_fmt; 79#define FMT_STOP_BITS_MASK 0xc0 80#define FMT_STOP_BITS_1 0x00 81#define FMT_STOP_BITS_2 0x40 /* 1.5 stop bits if FMT_DATA_BITS_5 */ 82#define FMT_PARITY_MASK 0x38 83#define FMT_PARITY_NONE 0x00 84#define FMT_PARITY_ODD 0x08 85#define FMT_PARITY_EVEN 0x18 86#define FMT_PARITY_MARK 0x28 87#define FMT_PARITY_SPACE 0x38 88#define FMT_DATA_BITS_MASK 0x03 89#define FMT_DATA_BITS_5 0x00 90#define FMT_DATA_BITS_6 0x01 91#define FMT_DATA_BITS_7 0x02 92#define FMT_DATA_BITS_8 0x03 93 u8 something; /* always equals 0x43 */ 94 u8 control; /* settings of flow control lines */ 95#define CONTROL_MASK 0x0c 96#define CONTROL_DTR_HIGH 0x08 97#define CONTROL_RTS_HIGH 0x04 98 u8 tx_status; 99#define TX_BUFFER_EMPTIED 0x09 100 u8 pin_state; 101#define PIN_MASK 0x3f 102#define PIN_MSR_MASK 0x1b 103#define PIN_RTS 0x20 /* output pin */ 104#define PIN_CTS 0x10 /* input pin, active low */ 105#define PIN_DSR 0x08 /* input pin, active low */ 106#define PIN_DTR 0x04 /* output pin */ 107#define PIN_RI 0x02 /* input pin, active low */ 108#define PIN_DCD 0x01 /* input pin, active low */ 109 u8 rx_bytes_avail; /* number of bytes in rx buffer */; 110}; 111 112#define OTI6858_CTRL_PKT_SIZE sizeof(struct oti6858_control_pkt) 113#define OTI6858_CTRL_EQUALS_PENDING(a, priv) \ 114 (((a)->divisor == (priv)->pending_setup.divisor) \ 115 && ((a)->control == (priv)->pending_setup.control) \ 116 && ((a)->frame_fmt == (priv)->pending_setup.frame_fmt)) 117 118/* function prototypes */ 119static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port); 120static void oti6858_close(struct usb_serial_port *port); 121static void oti6858_set_termios(struct tty_struct *tty, 122 struct usb_serial_port *port, 123 const struct ktermios *old_termios); 124static void oti6858_init_termios(struct tty_struct *tty); 125static void oti6858_read_int_callback(struct urb *urb); 126static void oti6858_read_bulk_callback(struct urb *urb); 127static void oti6858_write_bulk_callback(struct urb *urb); 128static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port, 129 const unsigned char *buf, int count); 130static unsigned int oti6858_write_room(struct tty_struct *tty); 131static unsigned int oti6858_chars_in_buffer(struct tty_struct *tty); 132static int oti6858_tiocmget(struct tty_struct *tty); 133static int oti6858_tiocmset(struct tty_struct *tty, 134 unsigned int set, unsigned int clear); 135static int oti6858_port_probe(struct usb_serial_port *port); 136static void oti6858_port_remove(struct usb_serial_port *port); 137 138/* device info */ 139static struct usb_serial_driver oti6858_device = { 140 .driver = { 141 .owner = THIS_MODULE, 142 .name = "oti6858", 143 }, 144 .id_table = id_table, 145 .num_ports = 1, 146 .num_bulk_in = 1, 147 .num_bulk_out = 1, 148 .num_interrupt_in = 1, 149 .open = oti6858_open, 150 .close = oti6858_close, 151 .write = oti6858_write, 152 .set_termios = oti6858_set_termios, 153 .init_termios = oti6858_init_termios, 154 .tiocmget = oti6858_tiocmget, 155 .tiocmset = oti6858_tiocmset, 156 .tiocmiwait = usb_serial_generic_tiocmiwait, 157 .read_bulk_callback = oti6858_read_bulk_callback, 158 .read_int_callback = oti6858_read_int_callback, 159 .write_bulk_callback = oti6858_write_bulk_callback, 160 .write_room = oti6858_write_room, 161 .chars_in_buffer = oti6858_chars_in_buffer, 162 .port_probe = oti6858_port_probe, 163 .port_remove = oti6858_port_remove, 164}; 165 166static struct usb_serial_driver * const serial_drivers[] = { 167 &oti6858_device, NULL 168}; 169 170struct oti6858_private { 171 spinlock_t lock; 172 173 struct oti6858_control_pkt status; 174 175 struct { 176 u8 read_urb_in_use; 177 u8 write_urb_in_use; 178 } flags; 179 struct delayed_work delayed_write_work; 180 181 struct { 182 __le16 divisor; 183 u8 frame_fmt; 184 u8 control; 185 } pending_setup; 186 u8 transient; 187 u8 setup_done; 188 struct delayed_work delayed_setup_work; 189 190 struct usb_serial_port *port; /* USB port with which associated */ 191}; 192 193static void setup_line(struct work_struct *work) 194{ 195 struct oti6858_private *priv = container_of(work, 196 struct oti6858_private, delayed_setup_work.work); 197 struct usb_serial_port *port = priv->port; 198 struct oti6858_control_pkt *new_setup; 199 unsigned long flags; 200 int result; 201 202 new_setup = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL); 203 if (!new_setup) { 204 /* we will try again */ 205 schedule_delayed_work(&priv->delayed_setup_work, 206 msecs_to_jiffies(2)); 207 return; 208 } 209 210 result = usb_control_msg(port->serial->dev, 211 usb_rcvctrlpipe(port->serial->dev, 0), 212 OTI6858_REQ_T_GET_STATUS, 213 OTI6858_REQ_GET_STATUS, 214 0, 0, 215 new_setup, OTI6858_CTRL_PKT_SIZE, 216 100); 217 218 if (result != OTI6858_CTRL_PKT_SIZE) { 219 dev_err(&port->dev, "%s(): error reading status\n", __func__); 220 kfree(new_setup); 221 /* we will try again */ 222 schedule_delayed_work(&priv->delayed_setup_work, 223 msecs_to_jiffies(2)); 224 return; 225 } 226 227 spin_lock_irqsave(&priv->lock, flags); 228 if (!OTI6858_CTRL_EQUALS_PENDING(new_setup, priv)) { 229 new_setup->divisor = priv->pending_setup.divisor; 230 new_setup->control = priv->pending_setup.control; 231 new_setup->frame_fmt = priv->pending_setup.frame_fmt; 232 233 spin_unlock_irqrestore(&priv->lock, flags); 234 result = usb_control_msg(port->serial->dev, 235 usb_sndctrlpipe(port->serial->dev, 0), 236 OTI6858_REQ_T_SET_LINE, 237 OTI6858_REQ_SET_LINE, 238 0, 0, 239 new_setup, OTI6858_CTRL_PKT_SIZE, 240 100); 241 } else { 242 spin_unlock_irqrestore(&priv->lock, flags); 243 result = 0; 244 } 245 kfree(new_setup); 246 247 spin_lock_irqsave(&priv->lock, flags); 248 if (result != OTI6858_CTRL_PKT_SIZE) 249 priv->transient = 0; 250 priv->setup_done = 1; 251 spin_unlock_irqrestore(&priv->lock, flags); 252 253 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__); 254 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); 255 if (result != 0) { 256 dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n", 257 __func__, result); 258 } 259} 260 261static void send_data(struct work_struct *work) 262{ 263 struct oti6858_private *priv = container_of(work, 264 struct oti6858_private, delayed_write_work.work); 265 struct usb_serial_port *port = priv->port; 266 int count = 0, result; 267 unsigned long flags; 268 u8 *allow; 269 270 spin_lock_irqsave(&priv->lock, flags); 271 if (priv->flags.write_urb_in_use) { 272 spin_unlock_irqrestore(&priv->lock, flags); 273 schedule_delayed_work(&priv->delayed_write_work, 274 msecs_to_jiffies(2)); 275 return; 276 } 277 priv->flags.write_urb_in_use = 1; 278 spin_unlock_irqrestore(&priv->lock, flags); 279 280 spin_lock_irqsave(&port->lock, flags); 281 count = kfifo_len(&port->write_fifo); 282 spin_unlock_irqrestore(&port->lock, flags); 283 284 if (count > port->bulk_out_size) 285 count = port->bulk_out_size; 286 287 if (count != 0) { 288 allow = kmalloc(1, GFP_KERNEL); 289 if (!allow) 290 return; 291 292 result = usb_control_msg(port->serial->dev, 293 usb_rcvctrlpipe(port->serial->dev, 0), 294 OTI6858_REQ_T_CHECK_TXBUFF, 295 OTI6858_REQ_CHECK_TXBUFF, 296 count, 0, allow, 1, 100); 297 if (result != 1 || *allow != 0) 298 count = 0; 299 kfree(allow); 300 } 301 302 if (count == 0) { 303 priv->flags.write_urb_in_use = 0; 304 305 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__); 306 result = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO); 307 if (result != 0) { 308 dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n", 309 __func__, result); 310 } 311 return; 312 } 313 314 count = kfifo_out_locked(&port->write_fifo, 315 port->write_urb->transfer_buffer, 316 count, &port->lock); 317 port->write_urb->transfer_buffer_length = count; 318 result = usb_submit_urb(port->write_urb, GFP_NOIO); 319 if (result != 0) { 320 dev_err_console(port, "%s(): usb_submit_urb() failed with error %d\n", 321 __func__, result); 322 priv->flags.write_urb_in_use = 0; 323 } 324 325 usb_serial_port_softint(port); 326} 327 328static int oti6858_port_probe(struct usb_serial_port *port) 329{ 330 struct oti6858_private *priv; 331 332 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 333 if (!priv) 334 return -ENOMEM; 335 336 spin_lock_init(&priv->lock); 337 priv->port = port; 338 INIT_DELAYED_WORK(&priv->delayed_setup_work, setup_line); 339 INIT_DELAYED_WORK(&priv->delayed_write_work, send_data); 340 341 usb_set_serial_port_data(port, priv); 342 343 port->port.drain_delay = 256; /* FIXME: check the FIFO length */ 344 345 return 0; 346} 347 348static void oti6858_port_remove(struct usb_serial_port *port) 349{ 350 struct oti6858_private *priv; 351 352 priv = usb_get_serial_port_data(port); 353 kfree(priv); 354} 355 356static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port, 357 const unsigned char *buf, int count) 358{ 359 if (!count) 360 return count; 361 362 count = kfifo_in_locked(&port->write_fifo, buf, count, &port->lock); 363 364 return count; 365} 366 367static unsigned int oti6858_write_room(struct tty_struct *tty) 368{ 369 struct usb_serial_port *port = tty->driver_data; 370 unsigned int room; 371 unsigned long flags; 372 373 spin_lock_irqsave(&port->lock, flags); 374 room = kfifo_avail(&port->write_fifo); 375 spin_unlock_irqrestore(&port->lock, flags); 376 377 return room; 378} 379 380static unsigned int oti6858_chars_in_buffer(struct tty_struct *tty) 381{ 382 struct usb_serial_port *port = tty->driver_data; 383 unsigned int chars; 384 unsigned long flags; 385 386 spin_lock_irqsave(&port->lock, flags); 387 chars = kfifo_len(&port->write_fifo); 388 spin_unlock_irqrestore(&port->lock, flags); 389 390 return chars; 391} 392 393static void oti6858_init_termios(struct tty_struct *tty) 394{ 395 tty_encode_baud_rate(tty, 38400, 38400); 396} 397 398static void oti6858_set_termios(struct tty_struct *tty, 399 struct usb_serial_port *port, 400 const struct ktermios *old_termios) 401{ 402 struct oti6858_private *priv = usb_get_serial_port_data(port); 403 unsigned long flags; 404 unsigned int cflag; 405 u8 frame_fmt, control; 406 __le16 divisor; 407 int br; 408 409 cflag = tty->termios.c_cflag; 410 411 spin_lock_irqsave(&priv->lock, flags); 412 frame_fmt = priv->pending_setup.frame_fmt; 413 control = priv->pending_setup.control; 414 spin_unlock_irqrestore(&priv->lock, flags); 415 416 frame_fmt &= ~FMT_DATA_BITS_MASK; 417 switch (cflag & CSIZE) { 418 case CS5: 419 frame_fmt |= FMT_DATA_BITS_5; 420 break; 421 case CS6: 422 frame_fmt |= FMT_DATA_BITS_6; 423 break; 424 case CS7: 425 frame_fmt |= FMT_DATA_BITS_7; 426 break; 427 default: 428 case CS8: 429 frame_fmt |= FMT_DATA_BITS_8; 430 break; 431 } 432 433 /* manufacturer claims that this device can work with baud rates 434 * up to 3 Mbps; I've tested it only on 115200 bps, so I can't 435 * guarantee that any other baud rate will work (especially 436 * the higher ones) 437 */ 438 br = tty_get_baud_rate(tty); 439 if (br == 0) { 440 divisor = 0; 441 } else { 442 int real_br; 443 int new_divisor; 444 br = min(br, OTI6858_MAX_BAUD_RATE); 445 446 new_divisor = (96000000 + 8 * br) / (16 * br); 447 real_br = 96000000 / (16 * new_divisor); 448 divisor = cpu_to_le16(new_divisor); 449 tty_encode_baud_rate(tty, real_br, real_br); 450 } 451 452 frame_fmt &= ~FMT_STOP_BITS_MASK; 453 if ((cflag & CSTOPB) != 0) 454 frame_fmt |= FMT_STOP_BITS_2; 455 else 456 frame_fmt |= FMT_STOP_BITS_1; 457 458 frame_fmt &= ~FMT_PARITY_MASK; 459 if ((cflag & PARENB) != 0) { 460 if ((cflag & PARODD) != 0) 461 frame_fmt |= FMT_PARITY_ODD; 462 else 463 frame_fmt |= FMT_PARITY_EVEN; 464 } else { 465 frame_fmt |= FMT_PARITY_NONE; 466 } 467 468 control &= ~CONTROL_MASK; 469 if ((cflag & CRTSCTS) != 0) 470 control |= (CONTROL_DTR_HIGH | CONTROL_RTS_HIGH); 471 472 /* change control lines if we are switching to or from B0 */ 473 /* FIXME: 474 spin_lock_irqsave(&priv->lock, flags); 475 control = priv->line_control; 476 if ((cflag & CBAUD) == B0) 477 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS); 478 else 479 priv->line_control |= (CONTROL_DTR | CONTROL_RTS); 480 if (control != priv->line_control) { 481 control = priv->line_control; 482 spin_unlock_irqrestore(&priv->lock, flags); 483 set_control_lines(serial->dev, control); 484 } else { 485 spin_unlock_irqrestore(&priv->lock, flags); 486 } 487 */ 488 489 spin_lock_irqsave(&priv->lock, flags); 490 if (divisor != priv->pending_setup.divisor 491 || control != priv->pending_setup.control 492 || frame_fmt != priv->pending_setup.frame_fmt) { 493 priv->pending_setup.divisor = divisor; 494 priv->pending_setup.control = control; 495 priv->pending_setup.frame_fmt = frame_fmt; 496 } 497 spin_unlock_irqrestore(&priv->lock, flags); 498} 499 500static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port) 501{ 502 struct oti6858_private *priv = usb_get_serial_port_data(port); 503 struct usb_serial *serial = port->serial; 504 struct oti6858_control_pkt *buf; 505 unsigned long flags; 506 int result; 507 508 usb_clear_halt(serial->dev, port->write_urb->pipe); 509 usb_clear_halt(serial->dev, port->read_urb->pipe); 510 511 buf = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL); 512 if (!buf) 513 return -ENOMEM; 514 515 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 516 OTI6858_REQ_T_GET_STATUS, 517 OTI6858_REQ_GET_STATUS, 518 0, 0, 519 buf, OTI6858_CTRL_PKT_SIZE, 520 100); 521 if (result != OTI6858_CTRL_PKT_SIZE) { 522 /* assume default (after power-on reset) values */ 523 buf->divisor = cpu_to_le16(0x009c); /* 38400 bps */ 524 buf->frame_fmt = 0x03; /* 8N1 */ 525 buf->something = 0x43; 526 buf->control = 0x4c; /* DTR, RTS */ 527 buf->tx_status = 0x00; 528 buf->pin_state = 0x5b; /* RTS, CTS, DSR, DTR, RI, DCD */ 529 buf->rx_bytes_avail = 0x00; 530 } 531 532 spin_lock_irqsave(&priv->lock, flags); 533 memcpy(&priv->status, buf, OTI6858_CTRL_PKT_SIZE); 534 priv->pending_setup.divisor = buf->divisor; 535 priv->pending_setup.frame_fmt = buf->frame_fmt; 536 priv->pending_setup.control = buf->control; 537 spin_unlock_irqrestore(&priv->lock, flags); 538 kfree(buf); 539 540 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__); 541 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); 542 if (result != 0) { 543 dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n", 544 __func__, result); 545 oti6858_close(port); 546 return result; 547 } 548 549 /* setup termios */ 550 if (tty) 551 oti6858_set_termios(tty, port, NULL); 552 553 return 0; 554} 555 556static void oti6858_close(struct usb_serial_port *port) 557{ 558 struct oti6858_private *priv = usb_get_serial_port_data(port); 559 unsigned long flags; 560 561 spin_lock_irqsave(&port->lock, flags); 562 /* clear out any remaining data in the buffer */ 563 kfifo_reset_out(&port->write_fifo); 564 spin_unlock_irqrestore(&port->lock, flags); 565 566 dev_dbg(&port->dev, "%s(): after buf_clear()\n", __func__); 567 568 /* cancel scheduled setup */ 569 cancel_delayed_work_sync(&priv->delayed_setup_work); 570 cancel_delayed_work_sync(&priv->delayed_write_work); 571 572 /* shutdown our urbs */ 573 dev_dbg(&port->dev, "%s(): shutting down urbs\n", __func__); 574 usb_kill_urb(port->write_urb); 575 usb_kill_urb(port->read_urb); 576 usb_kill_urb(port->interrupt_in_urb); 577} 578 579static int oti6858_tiocmset(struct tty_struct *tty, 580 unsigned int set, unsigned int clear) 581{ 582 struct usb_serial_port *port = tty->driver_data; 583 struct oti6858_private *priv = usb_get_serial_port_data(port); 584 unsigned long flags; 585 u8 control; 586 587 dev_dbg(&port->dev, "%s(set = 0x%08x, clear = 0x%08x)\n", 588 __func__, set, clear); 589 590 /* FIXME: check if this is correct (active high/low) */ 591 spin_lock_irqsave(&priv->lock, flags); 592 control = priv->pending_setup.control; 593 if ((set & TIOCM_RTS) != 0) 594 control |= CONTROL_RTS_HIGH; 595 if ((set & TIOCM_DTR) != 0) 596 control |= CONTROL_DTR_HIGH; 597 if ((clear & TIOCM_RTS) != 0) 598 control &= ~CONTROL_RTS_HIGH; 599 if ((clear & TIOCM_DTR) != 0) 600 control &= ~CONTROL_DTR_HIGH; 601 602 if (control != priv->pending_setup.control) 603 priv->pending_setup.control = control; 604 605 spin_unlock_irqrestore(&priv->lock, flags); 606 return 0; 607} 608 609static int oti6858_tiocmget(struct tty_struct *tty) 610{ 611 struct usb_serial_port *port = tty->driver_data; 612 struct oti6858_private *priv = usb_get_serial_port_data(port); 613 unsigned long flags; 614 unsigned pin_state; 615 unsigned result = 0; 616 617 spin_lock_irqsave(&priv->lock, flags); 618 pin_state = priv->status.pin_state & PIN_MASK; 619 spin_unlock_irqrestore(&priv->lock, flags); 620 621 /* FIXME: check if this is correct (active high/low) */ 622 if ((pin_state & PIN_RTS) != 0) 623 result |= TIOCM_RTS; 624 if ((pin_state & PIN_CTS) != 0) 625 result |= TIOCM_CTS; 626 if ((pin_state & PIN_DSR) != 0) 627 result |= TIOCM_DSR; 628 if ((pin_state & PIN_DTR) != 0) 629 result |= TIOCM_DTR; 630 if ((pin_state & PIN_RI) != 0) 631 result |= TIOCM_RI; 632 if ((pin_state & PIN_DCD) != 0) 633 result |= TIOCM_CD; 634 635 dev_dbg(&port->dev, "%s() = 0x%08x\n", __func__, result); 636 637 return result; 638} 639 640static void oti6858_read_int_callback(struct urb *urb) 641{ 642 struct usb_serial_port *port = urb->context; 643 struct oti6858_private *priv = usb_get_serial_port_data(port); 644 int transient = 0, can_recv = 0, resubmit = 1; 645 int status = urb->status; 646 647 switch (status) { 648 case 0: 649 /* success */ 650 break; 651 case -ECONNRESET: 652 case -ENOENT: 653 case -ESHUTDOWN: 654 /* this urb is terminated, clean up */ 655 dev_dbg(&urb->dev->dev, "%s(): urb shutting down with status: %d\n", 656 __func__, status); 657 return; 658 default: 659 dev_dbg(&urb->dev->dev, "%s(): nonzero urb status received: %d\n", 660 __func__, status); 661 break; 662 } 663 664 if (status == 0 && urb->actual_length == OTI6858_CTRL_PKT_SIZE) { 665 struct oti6858_control_pkt *xs = urb->transfer_buffer; 666 unsigned long flags; 667 668 spin_lock_irqsave(&priv->lock, flags); 669 670 if (!priv->transient) { 671 if (!OTI6858_CTRL_EQUALS_PENDING(xs, priv)) { 672 if (xs->rx_bytes_avail == 0) { 673 priv->transient = 4; 674 priv->setup_done = 0; 675 resubmit = 0; 676 dev_dbg(&port->dev, "%s(): scheduling setup_line()\n", __func__); 677 schedule_delayed_work(&priv->delayed_setup_work, 0); 678 } 679 } 680 } else { 681 if (OTI6858_CTRL_EQUALS_PENDING(xs, priv)) { 682 priv->transient = 0; 683 } else if (!priv->setup_done) { 684 resubmit = 0; 685 } else if (--priv->transient == 0) { 686 if (xs->rx_bytes_avail == 0) { 687 priv->transient = 4; 688 priv->setup_done = 0; 689 resubmit = 0; 690 dev_dbg(&port->dev, "%s(): scheduling setup_line()\n", __func__); 691 schedule_delayed_work(&priv->delayed_setup_work, 0); 692 } 693 } 694 } 695 696 if (!priv->transient) { 697 u8 delta = xs->pin_state ^ priv->status.pin_state; 698 699 if (delta & PIN_MSR_MASK) { 700 if (delta & PIN_CTS) 701 port->icount.cts++; 702 if (delta & PIN_DSR) 703 port->icount.dsr++; 704 if (delta & PIN_RI) 705 port->icount.rng++; 706 if (delta & PIN_DCD) 707 port->icount.dcd++; 708 709 wake_up_interruptible(&port->port.delta_msr_wait); 710 } 711 712 memcpy(&priv->status, xs, OTI6858_CTRL_PKT_SIZE); 713 } 714 715 if (!priv->transient && xs->rx_bytes_avail != 0) { 716 can_recv = xs->rx_bytes_avail; 717 priv->flags.read_urb_in_use = 1; 718 } 719 720 transient = priv->transient; 721 spin_unlock_irqrestore(&priv->lock, flags); 722 } 723 724 if (can_recv) { 725 int result; 726 727 result = usb_submit_urb(port->read_urb, GFP_ATOMIC); 728 if (result != 0) { 729 priv->flags.read_urb_in_use = 0; 730 dev_err(&port->dev, "%s(): usb_submit_urb() failed," 731 " error %d\n", __func__, result); 732 } else { 733 resubmit = 0; 734 } 735 } else if (!transient) { 736 unsigned long flags; 737 int count; 738 739 spin_lock_irqsave(&port->lock, flags); 740 count = kfifo_len(&port->write_fifo); 741 spin_unlock_irqrestore(&port->lock, flags); 742 743 spin_lock_irqsave(&priv->lock, flags); 744 if (priv->flags.write_urb_in_use == 0 && count != 0) { 745 schedule_delayed_work(&priv->delayed_write_work, 0); 746 resubmit = 0; 747 } 748 spin_unlock_irqrestore(&priv->lock, flags); 749 } 750 751 if (resubmit) { 752 int result; 753 754/* dev_dbg(&urb->dev->dev, "%s(): submitting interrupt urb\n", __func__); */ 755 result = usb_submit_urb(urb, GFP_ATOMIC); 756 if (result != 0) { 757 dev_err(&urb->dev->dev, 758 "%s(): usb_submit_urb() failed with" 759 " error %d\n", __func__, result); 760 } 761 } 762} 763 764static void oti6858_read_bulk_callback(struct urb *urb) 765{ 766 struct usb_serial_port *port = urb->context; 767 struct oti6858_private *priv = usb_get_serial_port_data(port); 768 unsigned char *data = urb->transfer_buffer; 769 unsigned long flags; 770 int status = urb->status; 771 int result; 772 773 spin_lock_irqsave(&priv->lock, flags); 774 priv->flags.read_urb_in_use = 0; 775 spin_unlock_irqrestore(&priv->lock, flags); 776 777 if (status != 0) { 778 dev_dbg(&urb->dev->dev, "%s(): unable to handle the error, exiting\n", __func__); 779 return; 780 } 781 782 if (urb->actual_length > 0) { 783 tty_insert_flip_string(&port->port, data, urb->actual_length); 784 tty_flip_buffer_push(&port->port); 785 } 786 787 /* schedule the interrupt urb */ 788 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC); 789 if (result != 0 && result != -EPERM) { 790 dev_err(&port->dev, "%s(): usb_submit_urb() failed," 791 " error %d\n", __func__, result); 792 } 793} 794 795static void oti6858_write_bulk_callback(struct urb *urb) 796{ 797 struct usb_serial_port *port = urb->context; 798 struct oti6858_private *priv = usb_get_serial_port_data(port); 799 int status = urb->status; 800 int result; 801 802 switch (status) { 803 case 0: 804 /* success */ 805 break; 806 case -ECONNRESET: 807 case -ENOENT: 808 case -ESHUTDOWN: 809 /* this urb is terminated, clean up */ 810 dev_dbg(&urb->dev->dev, "%s(): urb shutting down with status: %d\n", __func__, status); 811 priv->flags.write_urb_in_use = 0; 812 return; 813 default: 814 /* error in the urb, so we have to resubmit it */ 815 dev_dbg(&urb->dev->dev, "%s(): nonzero write bulk status received: %d\n", __func__, status); 816 dev_dbg(&urb->dev->dev, "%s(): overflow in write\n", __func__); 817 818 port->write_urb->transfer_buffer_length = 1; 819 result = usb_submit_urb(port->write_urb, GFP_ATOMIC); 820 if (result) { 821 dev_err_console(port, "%s(): usb_submit_urb() failed," 822 " error %d\n", __func__, result); 823 } else { 824 return; 825 } 826 } 827 828 priv->flags.write_urb_in_use = 0; 829 830 /* schedule the interrupt urb if we are still open */ 831 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__); 832 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC); 833 if (result != 0) { 834 dev_err(&port->dev, "%s(): failed submitting int urb," 835 " error %d\n", __func__, result); 836 } 837} 838 839module_usb_serial_driver(serial_drivers, id_table); 840 841MODULE_DESCRIPTION(OTI6858_DESCRIPTION); 842MODULE_AUTHOR(OTI6858_AUTHOR); 843MODULE_LICENSE("GPL v2"); 844