1 /* 2 * Ours Technology Inc. OTi-6858 USB to serial adapter driver. 3 * 4 * Copyleft (C) 2007 Kees Lemmens (adapted for kernel 2.6.20) 5 * Copyright (C) 2006 Tomasz Michal Lukaszewski (FIXME: add e-mail) 6 * Copyright (C) 2001-2004 Greg Kroah-Hartman (greg@kroah.com) 7 * Copyright (C) 2003 IBM Corp. 8 * 9 * Many thanks to the authors of pl2303 driver: all functions in this file 10 * are heavily based on pl2303 code, buffering code is a 1-to-1 copy. 11 * 12 * Warning! You use this driver on your own risk! The only official 13 * description of this device I have is datasheet from manufacturer, 14 * and it doesn't contain almost any information needed to write a driver. 15 * Almost all knowlegde used while writing this driver was gathered by: 16 * - analyzing traffic between device and the M$ Windows 2000 driver, 17 * - trying different bit combinations and checking pin states 18 * with a voltmeter, 19 * - receiving malformed frames and producing buffer overflows 20 * to learn how errors are reported, 21 * So, THIS CODE CAN DESTROY OTi-6858 AND ANY OTHER DEVICES, THAT ARE 22 * CONNECTED TO IT! 23 * 24 * This program is free software; you can redistribute it and/or modify 25 * it under the terms of the GNU General Public License as published by 26 * the Free Software Foundation; either version 2 of the License. 27 * 28 * See Documentation/usb/usb-serial.txt for more information on using this 29 * driver 30 * 31 * TODO: 32 * - implement correct flushing for ioctls and oti6858_close() 33 * - check how errors (rx overflow, parity error, framing error) are reported 34 * - implement oti6858_break_ctl() 35 * - implement more ioctls 36 * - test/implement flow control 37 * - allow setting custom baud rates 38 */ 39 40 #include <linux/kernel.h> 41 #include <linux/errno.h> 42 #include <linux/init.h> 43 #include <linux/slab.h> 44 #include <linux/tty.h> 45 #include <linux/tty_driver.h> 46 #include <linux/tty_flip.h> 47 #include <linux/serial.h> 48 #include <linux/module.h> 49 #include <linux/moduleparam.h> 50 #include <linux/spinlock.h> 51 #include <linux/usb.h> 52 #include <linux/usb/serial.h> 53 #include <linux/uaccess.h> 54 #include <linux/kfifo.h> 55 #include "oti6858.h" 56 57 #define OTI6858_DESCRIPTION \ 58 "Ours Technology Inc. OTi-6858 USB to serial adapter driver" 59 #define OTI6858_AUTHOR "Tomasz Michal Lukaszewski <FIXME@FIXME>" 60 61 static const struct usb_device_id id_table[] = { 62 { USB_DEVICE(OTI6858_VENDOR_ID, OTI6858_PRODUCT_ID) }, 63 { } 64 }; 65 66 MODULE_DEVICE_TABLE(usb, id_table); 67 68 /* requests */ 69 #define OTI6858_REQ_GET_STATUS (USB_DIR_IN | USB_TYPE_VENDOR | 0x00) 70 #define OTI6858_REQ_T_GET_STATUS 0x01 71 72 #define OTI6858_REQ_SET_LINE (USB_DIR_OUT | USB_TYPE_VENDOR | 0x00) 73 #define OTI6858_REQ_T_SET_LINE 0x00 74 75 #define OTI6858_REQ_CHECK_TXBUFF (USB_DIR_IN | USB_TYPE_VENDOR | 0x01) 76 #define OTI6858_REQ_T_CHECK_TXBUFF 0x00 77 78 /* format of the control packet */ 79 struct oti6858_control_pkt { 80 __le16 divisor; /* baud rate = 96000000 / (16 * divisor), LE */ 81 #define OTI6858_MAX_BAUD_RATE 3000000 82 u8 frame_fmt; 83 #define FMT_STOP_BITS_MASK 0xc0 84 #define FMT_STOP_BITS_1 0x00 85 #define FMT_STOP_BITS_2 0x40 /* 1.5 stop bits if FMT_DATA_BITS_5 */ 86 #define FMT_PARITY_MASK 0x38 87 #define FMT_PARITY_NONE 0x00 88 #define FMT_PARITY_ODD 0x08 89 #define FMT_PARITY_EVEN 0x18 90 #define FMT_PARITY_MARK 0x28 91 #define FMT_PARITY_SPACE 0x38 92 #define FMT_DATA_BITS_MASK 0x03 93 #define FMT_DATA_BITS_5 0x00 94 #define FMT_DATA_BITS_6 0x01 95 #define FMT_DATA_BITS_7 0x02 96 #define FMT_DATA_BITS_8 0x03 97 u8 something; /* always equals 0x43 */ 98 u8 control; /* settings of flow control lines */ 99 #define CONTROL_MASK 0x0c 100 #define CONTROL_DTR_HIGH 0x08 101 #define CONTROL_RTS_HIGH 0x04 102 u8 tx_status; 103 #define TX_BUFFER_EMPTIED 0x09 104 u8 pin_state; 105 #define PIN_MASK 0x3f 106 #define PIN_MSR_MASK 0x1b 107 #define PIN_RTS 0x20 /* output pin */ 108 #define PIN_CTS 0x10 /* input pin, active low */ 109 #define PIN_DSR 0x08 /* input pin, active low */ 110 #define PIN_DTR 0x04 /* output pin */ 111 #define PIN_RI 0x02 /* input pin, active low */ 112 #define PIN_DCD 0x01 /* input pin, active low */ 113 u8 rx_bytes_avail; /* number of bytes in rx buffer */; 114 }; 115 116 #define OTI6858_CTRL_PKT_SIZE sizeof(struct oti6858_control_pkt) 117 #define OTI6858_CTRL_EQUALS_PENDING(a, priv) \ 118 (((a)->divisor == (priv)->pending_setup.divisor) \ 119 && ((a)->control == (priv)->pending_setup.control) \ 120 && ((a)->frame_fmt == (priv)->pending_setup.frame_fmt)) 121 122 /* function prototypes */ 123 static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port); 124 static void oti6858_close(struct usb_serial_port *port); 125 static void oti6858_set_termios(struct tty_struct *tty, 126 struct usb_serial_port *port, struct ktermios *old); 127 static void oti6858_init_termios(struct tty_struct *tty); 128 static void oti6858_read_int_callback(struct urb *urb); 129 static void oti6858_read_bulk_callback(struct urb *urb); 130 static void oti6858_write_bulk_callback(struct urb *urb); 131 static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port, 132 const unsigned char *buf, int count); 133 static int oti6858_write_room(struct tty_struct *tty); 134 static int oti6858_chars_in_buffer(struct tty_struct *tty); 135 static int oti6858_tiocmget(struct tty_struct *tty); 136 static int oti6858_tiocmset(struct tty_struct *tty, 137 unsigned int set, unsigned int clear); 138 static int oti6858_port_probe(struct usb_serial_port *port); 139 static int oti6858_port_remove(struct usb_serial_port *port); 140 141 /* device info */ 142 static struct usb_serial_driver oti6858_device = { 143 .driver = { 144 .owner = THIS_MODULE, 145 .name = "oti6858", 146 }, 147 .id_table = id_table, 148 .num_ports = 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 }; 165 166 static struct usb_serial_driver * const serial_drivers[] = { 167 &oti6858_device, NULL 168 }; 169 170 struct 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 }; 192 193 static 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 } 260 261 static 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 } 327 328 static 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 } 347 348 static int 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 return 0; 356 } 357 358 static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port, 359 const unsigned char *buf, int count) 360 { 361 if (!count) 362 return count; 363 364 count = kfifo_in_locked(&port->write_fifo, buf, count, &port->lock); 365 366 return count; 367 } 368 369 static int oti6858_write_room(struct tty_struct *tty) 370 { 371 struct usb_serial_port *port = tty->driver_data; 372 int room = 0; 373 unsigned long flags; 374 375 spin_lock_irqsave(&port->lock, flags); 376 room = kfifo_avail(&port->write_fifo); 377 spin_unlock_irqrestore(&port->lock, flags); 378 379 return room; 380 } 381 382 static int oti6858_chars_in_buffer(struct tty_struct *tty) 383 { 384 struct usb_serial_port *port = tty->driver_data; 385 int chars = 0; 386 unsigned long flags; 387 388 spin_lock_irqsave(&port->lock, flags); 389 chars = kfifo_len(&port->write_fifo); 390 spin_unlock_irqrestore(&port->lock, flags); 391 392 return chars; 393 } 394 395 static void oti6858_init_termios(struct tty_struct *tty) 396 { 397 tty->termios = tty_std_termios; 398 tty->termios.c_cflag = B38400 | CS8 | CREAD | HUPCL | CLOCAL; 399 tty->termios.c_ispeed = 38400; 400 tty->termios.c_ospeed = 38400; 401 } 402 403 static void oti6858_set_termios(struct tty_struct *tty, 404 struct usb_serial_port *port, struct ktermios *old_termios) 405 { 406 struct oti6858_private *priv = usb_get_serial_port_data(port); 407 unsigned long flags; 408 unsigned int cflag; 409 u8 frame_fmt, control; 410 __le16 divisor; 411 int br; 412 413 cflag = tty->termios.c_cflag; 414 415 spin_lock_irqsave(&priv->lock, flags); 416 divisor = priv->pending_setup.divisor; 417 frame_fmt = priv->pending_setup.frame_fmt; 418 control = priv->pending_setup.control; 419 spin_unlock_irqrestore(&priv->lock, flags); 420 421 frame_fmt &= ~FMT_DATA_BITS_MASK; 422 switch (cflag & CSIZE) { 423 case CS5: 424 frame_fmt |= FMT_DATA_BITS_5; 425 break; 426 case CS6: 427 frame_fmt |= FMT_DATA_BITS_6; 428 break; 429 case CS7: 430 frame_fmt |= FMT_DATA_BITS_7; 431 break; 432 default: 433 case CS8: 434 frame_fmt |= FMT_DATA_BITS_8; 435 break; 436 } 437 438 /* manufacturer claims that this device can work with baud rates 439 * up to 3 Mbps; I've tested it only on 115200 bps, so I can't 440 * guarantee that any other baud rate will work (especially 441 * the higher ones) 442 */ 443 br = tty_get_baud_rate(tty); 444 if (br == 0) { 445 divisor = 0; 446 } else { 447 int real_br; 448 int new_divisor; 449 br = min(br, OTI6858_MAX_BAUD_RATE); 450 451 new_divisor = (96000000 + 8 * br) / (16 * br); 452 real_br = 96000000 / (16 * new_divisor); 453 divisor = cpu_to_le16(new_divisor); 454 tty_encode_baud_rate(tty, real_br, real_br); 455 } 456 457 frame_fmt &= ~FMT_STOP_BITS_MASK; 458 if ((cflag & CSTOPB) != 0) 459 frame_fmt |= FMT_STOP_BITS_2; 460 else 461 frame_fmt |= FMT_STOP_BITS_1; 462 463 frame_fmt &= ~FMT_PARITY_MASK; 464 if ((cflag & PARENB) != 0) { 465 if ((cflag & PARODD) != 0) 466 frame_fmt |= FMT_PARITY_ODD; 467 else 468 frame_fmt |= FMT_PARITY_EVEN; 469 } else { 470 frame_fmt |= FMT_PARITY_NONE; 471 } 472 473 control &= ~CONTROL_MASK; 474 if ((cflag & CRTSCTS) != 0) 475 control |= (CONTROL_DTR_HIGH | CONTROL_RTS_HIGH); 476 477 /* change control lines if we are switching to or from B0 */ 478 /* FIXME: 479 spin_lock_irqsave(&priv->lock, flags); 480 control = priv->line_control; 481 if ((cflag & CBAUD) == B0) 482 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS); 483 else 484 priv->line_control |= (CONTROL_DTR | CONTROL_RTS); 485 if (control != priv->line_control) { 486 control = priv->line_control; 487 spin_unlock_irqrestore(&priv->lock, flags); 488 set_control_lines(serial->dev, control); 489 } else { 490 spin_unlock_irqrestore(&priv->lock, flags); 491 } 492 */ 493 494 spin_lock_irqsave(&priv->lock, flags); 495 if (divisor != priv->pending_setup.divisor 496 || control != priv->pending_setup.control 497 || frame_fmt != priv->pending_setup.frame_fmt) { 498 priv->pending_setup.divisor = divisor; 499 priv->pending_setup.control = control; 500 priv->pending_setup.frame_fmt = frame_fmt; 501 } 502 spin_unlock_irqrestore(&priv->lock, flags); 503 } 504 505 static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port) 506 { 507 struct oti6858_private *priv = usb_get_serial_port_data(port); 508 struct usb_serial *serial = port->serial; 509 struct oti6858_control_pkt *buf; 510 unsigned long flags; 511 int result; 512 513 usb_clear_halt(serial->dev, port->write_urb->pipe); 514 usb_clear_halt(serial->dev, port->read_urb->pipe); 515 516 buf = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL); 517 if (!buf) 518 return -ENOMEM; 519 520 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 521 OTI6858_REQ_T_GET_STATUS, 522 OTI6858_REQ_GET_STATUS, 523 0, 0, 524 buf, OTI6858_CTRL_PKT_SIZE, 525 100); 526 if (result != OTI6858_CTRL_PKT_SIZE) { 527 /* assume default (after power-on reset) values */ 528 buf->divisor = cpu_to_le16(0x009c); /* 38400 bps */ 529 buf->frame_fmt = 0x03; /* 8N1 */ 530 buf->something = 0x43; 531 buf->control = 0x4c; /* DTR, RTS */ 532 buf->tx_status = 0x00; 533 buf->pin_state = 0x5b; /* RTS, CTS, DSR, DTR, RI, DCD */ 534 buf->rx_bytes_avail = 0x00; 535 } 536 537 spin_lock_irqsave(&priv->lock, flags); 538 memcpy(&priv->status, buf, OTI6858_CTRL_PKT_SIZE); 539 priv->pending_setup.divisor = buf->divisor; 540 priv->pending_setup.frame_fmt = buf->frame_fmt; 541 priv->pending_setup.control = buf->control; 542 spin_unlock_irqrestore(&priv->lock, flags); 543 kfree(buf); 544 545 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__); 546 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); 547 if (result != 0) { 548 dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n", 549 __func__, result); 550 oti6858_close(port); 551 return result; 552 } 553 554 /* setup termios */ 555 if (tty) 556 oti6858_set_termios(tty, port, NULL); 557 558 return 0; 559 } 560 561 static void oti6858_close(struct usb_serial_port *port) 562 { 563 struct oti6858_private *priv = usb_get_serial_port_data(port); 564 unsigned long flags; 565 566 spin_lock_irqsave(&port->lock, flags); 567 /* clear out any remaining data in the buffer */ 568 kfifo_reset_out(&port->write_fifo); 569 spin_unlock_irqrestore(&port->lock, flags); 570 571 dev_dbg(&port->dev, "%s(): after buf_clear()\n", __func__); 572 573 /* cancel scheduled setup */ 574 cancel_delayed_work_sync(&priv->delayed_setup_work); 575 cancel_delayed_work_sync(&priv->delayed_write_work); 576 577 /* shutdown our urbs */ 578 dev_dbg(&port->dev, "%s(): shutting down urbs\n", __func__); 579 usb_kill_urb(port->write_urb); 580 usb_kill_urb(port->read_urb); 581 usb_kill_urb(port->interrupt_in_urb); 582 } 583 584 static int oti6858_tiocmset(struct tty_struct *tty, 585 unsigned int set, unsigned int clear) 586 { 587 struct usb_serial_port *port = tty->driver_data; 588 struct oti6858_private *priv = usb_get_serial_port_data(port); 589 unsigned long flags; 590 u8 control; 591 592 dev_dbg(&port->dev, "%s(set = 0x%08x, clear = 0x%08x)\n", 593 __func__, set, clear); 594 595 /* FIXME: check if this is correct (active high/low) */ 596 spin_lock_irqsave(&priv->lock, flags); 597 control = priv->pending_setup.control; 598 if ((set & TIOCM_RTS) != 0) 599 control |= CONTROL_RTS_HIGH; 600 if ((set & TIOCM_DTR) != 0) 601 control |= CONTROL_DTR_HIGH; 602 if ((clear & TIOCM_RTS) != 0) 603 control &= ~CONTROL_RTS_HIGH; 604 if ((clear & TIOCM_DTR) != 0) 605 control &= ~CONTROL_DTR_HIGH; 606 607 if (control != priv->pending_setup.control) 608 priv->pending_setup.control = control; 609 610 spin_unlock_irqrestore(&priv->lock, flags); 611 return 0; 612 } 613 614 static int oti6858_tiocmget(struct tty_struct *tty) 615 { 616 struct usb_serial_port *port = tty->driver_data; 617 struct oti6858_private *priv = usb_get_serial_port_data(port); 618 unsigned long flags; 619 unsigned pin_state; 620 unsigned result = 0; 621 622 spin_lock_irqsave(&priv->lock, flags); 623 pin_state = priv->status.pin_state & PIN_MASK; 624 spin_unlock_irqrestore(&priv->lock, flags); 625 626 /* FIXME: check if this is correct (active high/low) */ 627 if ((pin_state & PIN_RTS) != 0) 628 result |= TIOCM_RTS; 629 if ((pin_state & PIN_CTS) != 0) 630 result |= TIOCM_CTS; 631 if ((pin_state & PIN_DSR) != 0) 632 result |= TIOCM_DSR; 633 if ((pin_state & PIN_DTR) != 0) 634 result |= TIOCM_DTR; 635 if ((pin_state & PIN_RI) != 0) 636 result |= TIOCM_RI; 637 if ((pin_state & PIN_DCD) != 0) 638 result |= TIOCM_CD; 639 640 dev_dbg(&port->dev, "%s() = 0x%08x\n", __func__, result); 641 642 return result; 643 } 644 645 static void oti6858_read_int_callback(struct urb *urb) 646 { 647 struct usb_serial_port *port = urb->context; 648 struct oti6858_private *priv = usb_get_serial_port_data(port); 649 int transient = 0, can_recv = 0, resubmit = 1; 650 int status = urb->status; 651 652 switch (status) { 653 case 0: 654 /* success */ 655 break; 656 case -ECONNRESET: 657 case -ENOENT: 658 case -ESHUTDOWN: 659 /* this urb is terminated, clean up */ 660 dev_dbg(&urb->dev->dev, "%s(): urb shutting down with status: %d\n", 661 __func__, status); 662 return; 663 default: 664 dev_dbg(&urb->dev->dev, "%s(): nonzero urb status received: %d\n", 665 __func__, status); 666 break; 667 } 668 669 if (status == 0 && urb->actual_length == OTI6858_CTRL_PKT_SIZE) { 670 struct oti6858_control_pkt *xs = urb->transfer_buffer; 671 unsigned long flags; 672 673 spin_lock_irqsave(&priv->lock, flags); 674 675 if (!priv->transient) { 676 if (!OTI6858_CTRL_EQUALS_PENDING(xs, priv)) { 677 if (xs->rx_bytes_avail == 0) { 678 priv->transient = 4; 679 priv->setup_done = 0; 680 resubmit = 0; 681 dev_dbg(&port->dev, "%s(): scheduling setup_line()\n", __func__); 682 schedule_delayed_work(&priv->delayed_setup_work, 0); 683 } 684 } 685 } else { 686 if (OTI6858_CTRL_EQUALS_PENDING(xs, priv)) { 687 priv->transient = 0; 688 } else if (!priv->setup_done) { 689 resubmit = 0; 690 } else if (--priv->transient == 0) { 691 if (xs->rx_bytes_avail == 0) { 692 priv->transient = 4; 693 priv->setup_done = 0; 694 resubmit = 0; 695 dev_dbg(&port->dev, "%s(): scheduling setup_line()\n", __func__); 696 schedule_delayed_work(&priv->delayed_setup_work, 0); 697 } 698 } 699 } 700 701 if (!priv->transient) { 702 u8 delta = xs->pin_state ^ priv->status.pin_state; 703 704 if (delta & PIN_MSR_MASK) { 705 if (delta & PIN_CTS) 706 port->icount.cts++; 707 if (delta & PIN_DSR) 708 port->icount.dsr++; 709 if (delta & PIN_RI) 710 port->icount.rng++; 711 if (delta & PIN_DCD) 712 port->icount.dcd++; 713 714 wake_up_interruptible(&port->port.delta_msr_wait); 715 } 716 717 memcpy(&priv->status, xs, OTI6858_CTRL_PKT_SIZE); 718 } 719 720 if (!priv->transient && xs->rx_bytes_avail != 0) { 721 can_recv = xs->rx_bytes_avail; 722 priv->flags.read_urb_in_use = 1; 723 } 724 725 transient = priv->transient; 726 spin_unlock_irqrestore(&priv->lock, flags); 727 } 728 729 if (can_recv) { 730 int result; 731 732 result = usb_submit_urb(port->read_urb, GFP_ATOMIC); 733 if (result != 0) { 734 priv->flags.read_urb_in_use = 0; 735 dev_err(&port->dev, "%s(): usb_submit_urb() failed," 736 " error %d\n", __func__, result); 737 } else { 738 resubmit = 0; 739 } 740 } else if (!transient) { 741 unsigned long flags; 742 int count; 743 744 spin_lock_irqsave(&port->lock, flags); 745 count = kfifo_len(&port->write_fifo); 746 spin_unlock_irqrestore(&port->lock, flags); 747 748 spin_lock_irqsave(&priv->lock, flags); 749 if (priv->flags.write_urb_in_use == 0 && count != 0) { 750 schedule_delayed_work(&priv->delayed_write_work, 0); 751 resubmit = 0; 752 } 753 spin_unlock_irqrestore(&priv->lock, flags); 754 } 755 756 if (resubmit) { 757 int result; 758 759 /* dev_dbg(&urb->dev->dev, "%s(): submitting interrupt urb\n", __func__); */ 760 result = usb_submit_urb(urb, GFP_ATOMIC); 761 if (result != 0) { 762 dev_err(&urb->dev->dev, 763 "%s(): usb_submit_urb() failed with" 764 " error %d\n", __func__, result); 765 } 766 } 767 } 768 769 static void oti6858_read_bulk_callback(struct urb *urb) 770 { 771 struct usb_serial_port *port = urb->context; 772 struct oti6858_private *priv = usb_get_serial_port_data(port); 773 unsigned char *data = urb->transfer_buffer; 774 unsigned long flags; 775 int status = urb->status; 776 int result; 777 778 spin_lock_irqsave(&priv->lock, flags); 779 priv->flags.read_urb_in_use = 0; 780 spin_unlock_irqrestore(&priv->lock, flags); 781 782 if (status != 0) { 783 dev_dbg(&urb->dev->dev, "%s(): unable to handle the error, exiting\n", __func__); 784 return; 785 } 786 787 if (urb->actual_length > 0) { 788 tty_insert_flip_string(&port->port, data, urb->actual_length); 789 tty_flip_buffer_push(&port->port); 790 } 791 792 /* schedule the interrupt urb */ 793 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC); 794 if (result != 0 && result != -EPERM) { 795 dev_err(&port->dev, "%s(): usb_submit_urb() failed," 796 " error %d\n", __func__, result); 797 } 798 } 799 800 static void oti6858_write_bulk_callback(struct urb *urb) 801 { 802 struct usb_serial_port *port = urb->context; 803 struct oti6858_private *priv = usb_get_serial_port_data(port); 804 int status = urb->status; 805 int result; 806 807 switch (status) { 808 case 0: 809 /* success */ 810 break; 811 case -ECONNRESET: 812 case -ENOENT: 813 case -ESHUTDOWN: 814 /* this urb is terminated, clean up */ 815 dev_dbg(&urb->dev->dev, "%s(): urb shutting down with status: %d\n", __func__, status); 816 priv->flags.write_urb_in_use = 0; 817 return; 818 default: 819 /* error in the urb, so we have to resubmit it */ 820 dev_dbg(&urb->dev->dev, "%s(): nonzero write bulk status received: %d\n", __func__, status); 821 dev_dbg(&urb->dev->dev, "%s(): overflow in write\n", __func__); 822 823 port->write_urb->transfer_buffer_length = 1; 824 result = usb_submit_urb(port->write_urb, GFP_ATOMIC); 825 if (result) { 826 dev_err_console(port, "%s(): usb_submit_urb() failed," 827 " error %d\n", __func__, result); 828 } else { 829 return; 830 } 831 } 832 833 priv->flags.write_urb_in_use = 0; 834 835 /* schedule the interrupt urb if we are still open */ 836 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__); 837 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC); 838 if (result != 0) { 839 dev_err(&port->dev, "%s(): failed submitting int urb," 840 " error %d\n", __func__, result); 841 } 842 } 843 844 module_usb_serial_driver(serial_drivers, id_table); 845 846 MODULE_DESCRIPTION(OTI6858_DESCRIPTION); 847 MODULE_AUTHOR(OTI6858_AUTHOR); 848 MODULE_LICENSE("GPL"); 849