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