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_RTS 0x20 /* output pin */ 107 #define PIN_CTS 0x10 /* input pin, active low */ 108 #define PIN_DSR 0x08 /* input pin, active low */ 109 #define PIN_DTR 0x04 /* output pin */ 110 #define PIN_RI 0x02 /* input pin, active low */ 111 #define PIN_DCD 0x01 /* input pin, active low */ 112 u8 rx_bytes_avail; /* number of bytes in rx buffer */; 113 }; 114 115 #define OTI6858_CTRL_PKT_SIZE sizeof(struct oti6858_control_pkt) 116 #define OTI6858_CTRL_EQUALS_PENDING(a, priv) \ 117 (((a)->divisor == (priv)->pending_setup.divisor) \ 118 && ((a)->control == (priv)->pending_setup.control) \ 119 && ((a)->frame_fmt == (priv)->pending_setup.frame_fmt)) 120 121 /* function prototypes */ 122 static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port); 123 static void oti6858_close(struct usb_serial_port *port); 124 static void oti6858_set_termios(struct tty_struct *tty, 125 struct usb_serial_port *port, struct ktermios *old); 126 static void oti6858_init_termios(struct tty_struct *tty); 127 static void oti6858_read_int_callback(struct urb *urb); 128 static void oti6858_read_bulk_callback(struct urb *urb); 129 static void oti6858_write_bulk_callback(struct urb *urb); 130 static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port, 131 const unsigned char *buf, int count); 132 static int oti6858_write_room(struct tty_struct *tty); 133 static int oti6858_chars_in_buffer(struct tty_struct *tty); 134 static int oti6858_tiocmget(struct tty_struct *tty); 135 static int oti6858_tiocmset(struct tty_struct *tty, 136 unsigned int set, unsigned int clear); 137 static int oti6858_tiocmiwait(struct tty_struct *tty, unsigned long arg); 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 = oti6858_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 == NULL) { 204 dev_err(&port->dev, "%s(): out of memory!\n", __func__); 205 /* we will try again */ 206 schedule_delayed_work(&priv->delayed_setup_work, 207 msecs_to_jiffies(2)); 208 return; 209 } 210 211 result = usb_control_msg(port->serial->dev, 212 usb_rcvctrlpipe(port->serial->dev, 0), 213 OTI6858_REQ_T_GET_STATUS, 214 OTI6858_REQ_GET_STATUS, 215 0, 0, 216 new_setup, OTI6858_CTRL_PKT_SIZE, 217 100); 218 219 if (result != OTI6858_CTRL_PKT_SIZE) { 220 dev_err(&port->dev, "%s(): error reading status\n", __func__); 221 kfree(new_setup); 222 /* we will try again */ 223 schedule_delayed_work(&priv->delayed_setup_work, 224 msecs_to_jiffies(2)); 225 return; 226 } 227 228 spin_lock_irqsave(&priv->lock, flags); 229 if (!OTI6858_CTRL_EQUALS_PENDING(new_setup, priv)) { 230 new_setup->divisor = priv->pending_setup.divisor; 231 new_setup->control = priv->pending_setup.control; 232 new_setup->frame_fmt = priv->pending_setup.frame_fmt; 233 234 spin_unlock_irqrestore(&priv->lock, flags); 235 result = usb_control_msg(port->serial->dev, 236 usb_sndctrlpipe(port->serial->dev, 0), 237 OTI6858_REQ_T_SET_LINE, 238 OTI6858_REQ_SET_LINE, 239 0, 0, 240 new_setup, OTI6858_CTRL_PKT_SIZE, 241 100); 242 } else { 243 spin_unlock_irqrestore(&priv->lock, flags); 244 result = 0; 245 } 246 kfree(new_setup); 247 248 spin_lock_irqsave(&priv->lock, flags); 249 if (result != OTI6858_CTRL_PKT_SIZE) 250 priv->transient = 0; 251 priv->setup_done = 1; 252 spin_unlock_irqrestore(&priv->lock, flags); 253 254 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__); 255 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); 256 if (result != 0) { 257 dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n", 258 __func__, result); 259 } 260 } 261 262 static void send_data(struct work_struct *work) 263 { 264 struct oti6858_private *priv = container_of(work, 265 struct oti6858_private, delayed_write_work.work); 266 struct usb_serial_port *port = priv->port; 267 int count = 0, result; 268 unsigned long flags; 269 u8 *allow; 270 271 spin_lock_irqsave(&priv->lock, flags); 272 if (priv->flags.write_urb_in_use) { 273 spin_unlock_irqrestore(&priv->lock, flags); 274 schedule_delayed_work(&priv->delayed_write_work, 275 msecs_to_jiffies(2)); 276 return; 277 } 278 priv->flags.write_urb_in_use = 1; 279 spin_unlock_irqrestore(&priv->lock, flags); 280 281 spin_lock_irqsave(&port->lock, flags); 282 count = kfifo_len(&port->write_fifo); 283 spin_unlock_irqrestore(&port->lock, flags); 284 285 if (count > port->bulk_out_size) 286 count = port->bulk_out_size; 287 288 if (count != 0) { 289 allow = kmalloc(1, GFP_KERNEL); 290 if (!allow) { 291 dev_err_console(port, "%s(): kmalloc failed\n", 292 __func__); 293 return; 294 } 295 result = usb_control_msg(port->serial->dev, 296 usb_rcvctrlpipe(port->serial->dev, 0), 297 OTI6858_REQ_T_CHECK_TXBUFF, 298 OTI6858_REQ_CHECK_TXBUFF, 299 count, 0, allow, 1, 100); 300 if (result != 1 || *allow != 0) 301 count = 0; 302 kfree(allow); 303 } 304 305 if (count == 0) { 306 priv->flags.write_urb_in_use = 0; 307 308 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__); 309 result = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO); 310 if (result != 0) { 311 dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n", 312 __func__, result); 313 } 314 return; 315 } 316 317 count = kfifo_out_locked(&port->write_fifo, 318 port->write_urb->transfer_buffer, 319 count, &port->lock); 320 port->write_urb->transfer_buffer_length = count; 321 result = usb_submit_urb(port->write_urb, GFP_NOIO); 322 if (result != 0) { 323 dev_err_console(port, "%s(): usb_submit_urb() failed with error %d\n", 324 __func__, result); 325 priv->flags.write_urb_in_use = 0; 326 } 327 328 usb_serial_port_softint(port); 329 } 330 331 static int oti6858_port_probe(struct usb_serial_port *port) 332 { 333 struct oti6858_private *priv; 334 335 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 336 if (!priv) 337 return -ENOMEM; 338 339 spin_lock_init(&priv->lock); 340 priv->port = port; 341 INIT_DELAYED_WORK(&priv->delayed_setup_work, setup_line); 342 INIT_DELAYED_WORK(&priv->delayed_write_work, send_data); 343 344 usb_set_serial_port_data(port, priv); 345 346 return 0; 347 } 348 349 static int oti6858_port_remove(struct usb_serial_port *port) 350 { 351 struct oti6858_private *priv; 352 353 priv = usb_get_serial_port_data(port); 354 kfree(priv); 355 356 return 0; 357 } 358 359 static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port, 360 const unsigned char *buf, int count) 361 { 362 if (!count) 363 return count; 364 365 count = kfifo_in_locked(&port->write_fifo, buf, count, &port->lock); 366 367 return count; 368 } 369 370 static int oti6858_write_room(struct tty_struct *tty) 371 { 372 struct usb_serial_port *port = tty->driver_data; 373 int room = 0; 374 unsigned long flags; 375 376 spin_lock_irqsave(&port->lock, flags); 377 room = kfifo_avail(&port->write_fifo); 378 spin_unlock_irqrestore(&port->lock, flags); 379 380 return room; 381 } 382 383 static int oti6858_chars_in_buffer(struct tty_struct *tty) 384 { 385 struct usb_serial_port *port = tty->driver_data; 386 int chars = 0; 387 unsigned long flags; 388 389 spin_lock_irqsave(&port->lock, flags); 390 chars = kfifo_len(&port->write_fifo); 391 spin_unlock_irqrestore(&port->lock, flags); 392 393 return chars; 394 } 395 396 static void oti6858_init_termios(struct tty_struct *tty) 397 { 398 tty->termios = tty_std_termios; 399 tty->termios.c_cflag = B38400 | CS8 | CREAD | HUPCL | CLOCAL; 400 tty->termios.c_ispeed = 38400; 401 tty->termios.c_ospeed = 38400; 402 } 403 404 static void oti6858_set_termios(struct tty_struct *tty, 405 struct usb_serial_port *port, struct ktermios *old_termios) 406 { 407 struct oti6858_private *priv = usb_get_serial_port_data(port); 408 unsigned long flags; 409 unsigned int cflag; 410 u8 frame_fmt, control; 411 __le16 divisor; 412 int br; 413 414 if (!tty) 415 return; 416 417 cflag = tty->termios.c_cflag; 418 419 spin_lock_irqsave(&priv->lock, flags); 420 divisor = priv->pending_setup.divisor; 421 frame_fmt = priv->pending_setup.frame_fmt; 422 control = priv->pending_setup.control; 423 spin_unlock_irqrestore(&priv->lock, flags); 424 425 frame_fmt &= ~FMT_DATA_BITS_MASK; 426 switch (cflag & CSIZE) { 427 case CS5: 428 frame_fmt |= FMT_DATA_BITS_5; 429 break; 430 case CS6: 431 frame_fmt |= FMT_DATA_BITS_6; 432 break; 433 case CS7: 434 frame_fmt |= FMT_DATA_BITS_7; 435 break; 436 default: 437 case CS8: 438 frame_fmt |= FMT_DATA_BITS_8; 439 break; 440 } 441 442 /* manufacturer claims that this device can work with baud rates 443 * up to 3 Mbps; I've tested it only on 115200 bps, so I can't 444 * guarantee that any other baud rate will work (especially 445 * the higher ones) 446 */ 447 br = tty_get_baud_rate(tty); 448 if (br == 0) { 449 divisor = 0; 450 } else { 451 int real_br; 452 int new_divisor; 453 br = min(br, OTI6858_MAX_BAUD_RATE); 454 455 new_divisor = (96000000 + 8 * br) / (16 * br); 456 real_br = 96000000 / (16 * new_divisor); 457 divisor = cpu_to_le16(new_divisor); 458 tty_encode_baud_rate(tty, real_br, real_br); 459 } 460 461 frame_fmt &= ~FMT_STOP_BITS_MASK; 462 if ((cflag & CSTOPB) != 0) 463 frame_fmt |= FMT_STOP_BITS_2; 464 else 465 frame_fmt |= FMT_STOP_BITS_1; 466 467 frame_fmt &= ~FMT_PARITY_MASK; 468 if ((cflag & PARENB) != 0) { 469 if ((cflag & PARODD) != 0) 470 frame_fmt |= FMT_PARITY_ODD; 471 else 472 frame_fmt |= FMT_PARITY_EVEN; 473 } else { 474 frame_fmt |= FMT_PARITY_NONE; 475 } 476 477 control &= ~CONTROL_MASK; 478 if ((cflag & CRTSCTS) != 0) 479 control |= (CONTROL_DTR_HIGH | CONTROL_RTS_HIGH); 480 481 /* change control lines if we are switching to or from B0 */ 482 /* FIXME: 483 spin_lock_irqsave(&priv->lock, flags); 484 control = priv->line_control; 485 if ((cflag & CBAUD) == B0) 486 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS); 487 else 488 priv->line_control |= (CONTROL_DTR | CONTROL_RTS); 489 if (control != priv->line_control) { 490 control = priv->line_control; 491 spin_unlock_irqrestore(&priv->lock, flags); 492 set_control_lines(serial->dev, control); 493 } else { 494 spin_unlock_irqrestore(&priv->lock, flags); 495 } 496 */ 497 498 spin_lock_irqsave(&priv->lock, flags); 499 if (divisor != priv->pending_setup.divisor 500 || control != priv->pending_setup.control 501 || frame_fmt != priv->pending_setup.frame_fmt) { 502 priv->pending_setup.divisor = divisor; 503 priv->pending_setup.control = control; 504 priv->pending_setup.frame_fmt = frame_fmt; 505 } 506 spin_unlock_irqrestore(&priv->lock, flags); 507 } 508 509 static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port) 510 { 511 struct oti6858_private *priv = usb_get_serial_port_data(port); 512 struct ktermios tmp_termios; 513 struct usb_serial *serial = port->serial; 514 struct oti6858_control_pkt *buf; 515 unsigned long flags; 516 int result; 517 518 usb_clear_halt(serial->dev, port->write_urb->pipe); 519 usb_clear_halt(serial->dev, port->read_urb->pipe); 520 521 buf = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL); 522 if (buf == NULL) { 523 dev_err(&port->dev, "%s(): out of memory!\n", __func__); 524 return -ENOMEM; 525 } 526 527 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 528 OTI6858_REQ_T_GET_STATUS, 529 OTI6858_REQ_GET_STATUS, 530 0, 0, 531 buf, OTI6858_CTRL_PKT_SIZE, 532 100); 533 if (result != OTI6858_CTRL_PKT_SIZE) { 534 /* assume default (after power-on reset) values */ 535 buf->divisor = cpu_to_le16(0x009c); /* 38400 bps */ 536 buf->frame_fmt = 0x03; /* 8N1 */ 537 buf->something = 0x43; 538 buf->control = 0x4c; /* DTR, RTS */ 539 buf->tx_status = 0x00; 540 buf->pin_state = 0x5b; /* RTS, CTS, DSR, DTR, RI, DCD */ 541 buf->rx_bytes_avail = 0x00; 542 } 543 544 spin_lock_irqsave(&priv->lock, flags); 545 memcpy(&priv->status, buf, OTI6858_CTRL_PKT_SIZE); 546 priv->pending_setup.divisor = buf->divisor; 547 priv->pending_setup.frame_fmt = buf->frame_fmt; 548 priv->pending_setup.control = buf->control; 549 spin_unlock_irqrestore(&priv->lock, flags); 550 kfree(buf); 551 552 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__); 553 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); 554 if (result != 0) { 555 dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n", 556 __func__, result); 557 oti6858_close(port); 558 return result; 559 } 560 561 /* setup termios */ 562 if (tty) 563 oti6858_set_termios(tty, port, &tmp_termios); 564 port->port.drain_delay = 256; /* FIXME: check the FIFO length */ 565 return 0; 566 } 567 568 static void oti6858_close(struct usb_serial_port *port) 569 { 570 struct oti6858_private *priv = usb_get_serial_port_data(port); 571 unsigned long flags; 572 573 spin_lock_irqsave(&port->lock, flags); 574 /* clear out any remaining data in the buffer */ 575 kfifo_reset_out(&port->write_fifo); 576 spin_unlock_irqrestore(&port->lock, flags); 577 578 dev_dbg(&port->dev, "%s(): after buf_clear()\n", __func__); 579 580 /* cancel scheduled setup */ 581 cancel_delayed_work_sync(&priv->delayed_setup_work); 582 cancel_delayed_work_sync(&priv->delayed_write_work); 583 584 /* shutdown our urbs */ 585 dev_dbg(&port->dev, "%s(): shutting down urbs\n", __func__); 586 usb_kill_urb(port->write_urb); 587 usb_kill_urb(port->read_urb); 588 usb_kill_urb(port->interrupt_in_urb); 589 } 590 591 static int oti6858_tiocmset(struct tty_struct *tty, 592 unsigned int set, unsigned int clear) 593 { 594 struct usb_serial_port *port = tty->driver_data; 595 struct oti6858_private *priv = usb_get_serial_port_data(port); 596 unsigned long flags; 597 u8 control; 598 599 dev_dbg(&port->dev, "%s(set = 0x%08x, clear = 0x%08x)\n", 600 __func__, set, clear); 601 602 /* FIXME: check if this is correct (active high/low) */ 603 spin_lock_irqsave(&priv->lock, flags); 604 control = priv->pending_setup.control; 605 if ((set & TIOCM_RTS) != 0) 606 control |= CONTROL_RTS_HIGH; 607 if ((set & TIOCM_DTR) != 0) 608 control |= CONTROL_DTR_HIGH; 609 if ((clear & TIOCM_RTS) != 0) 610 control &= ~CONTROL_RTS_HIGH; 611 if ((clear & TIOCM_DTR) != 0) 612 control &= ~CONTROL_DTR_HIGH; 613 614 if (control != priv->pending_setup.control) 615 priv->pending_setup.control = control; 616 617 spin_unlock_irqrestore(&priv->lock, flags); 618 return 0; 619 } 620 621 static int oti6858_tiocmget(struct tty_struct *tty) 622 { 623 struct usb_serial_port *port = tty->driver_data; 624 struct oti6858_private *priv = usb_get_serial_port_data(port); 625 unsigned long flags; 626 unsigned pin_state; 627 unsigned result = 0; 628 629 spin_lock_irqsave(&priv->lock, flags); 630 pin_state = priv->status.pin_state & PIN_MASK; 631 spin_unlock_irqrestore(&priv->lock, flags); 632 633 /* FIXME: check if this is correct (active high/low) */ 634 if ((pin_state & PIN_RTS) != 0) 635 result |= TIOCM_RTS; 636 if ((pin_state & PIN_CTS) != 0) 637 result |= TIOCM_CTS; 638 if ((pin_state & PIN_DSR) != 0) 639 result |= TIOCM_DSR; 640 if ((pin_state & PIN_DTR) != 0) 641 result |= TIOCM_DTR; 642 if ((pin_state & PIN_RI) != 0) 643 result |= TIOCM_RI; 644 if ((pin_state & PIN_DCD) != 0) 645 result |= TIOCM_CD; 646 647 dev_dbg(&port->dev, "%s() = 0x%08x\n", __func__, result); 648 649 return result; 650 } 651 652 static int oti6858_tiocmiwait(struct tty_struct *tty, unsigned long arg) 653 { 654 struct usb_serial_port *port = tty->driver_data; 655 struct oti6858_private *priv = usb_get_serial_port_data(port); 656 unsigned long flags; 657 unsigned int prev, status; 658 unsigned int changed; 659 660 spin_lock_irqsave(&priv->lock, flags); 661 prev = priv->status.pin_state; 662 spin_unlock_irqrestore(&priv->lock, flags); 663 664 while (1) { 665 wait_event_interruptible(port->port.delta_msr_wait, 666 port->serial->disconnected || 667 priv->status.pin_state != prev); 668 if (signal_pending(current)) 669 return -ERESTARTSYS; 670 671 if (port->serial->disconnected) 672 return -EIO; 673 674 spin_lock_irqsave(&priv->lock, flags); 675 status = priv->status.pin_state & PIN_MASK; 676 spin_unlock_irqrestore(&priv->lock, flags); 677 678 changed = prev ^ status; 679 /* FIXME: check if this is correct (active high/low) */ 680 if (((arg & TIOCM_RNG) && (changed & PIN_RI)) || 681 ((arg & TIOCM_DSR) && (changed & PIN_DSR)) || 682 ((arg & TIOCM_CD) && (changed & PIN_DCD)) || 683 ((arg & TIOCM_CTS) && (changed & PIN_CTS))) 684 return 0; 685 prev = status; 686 } 687 688 /* NOTREACHED */ 689 return 0; 690 } 691 692 static void oti6858_read_int_callback(struct urb *urb) 693 { 694 struct usb_serial_port *port = urb->context; 695 struct oti6858_private *priv = usb_get_serial_port_data(port); 696 int transient = 0, can_recv = 0, resubmit = 1; 697 int status = urb->status; 698 699 switch (status) { 700 case 0: 701 /* success */ 702 break; 703 case -ECONNRESET: 704 case -ENOENT: 705 case -ESHUTDOWN: 706 /* this urb is terminated, clean up */ 707 dev_dbg(&urb->dev->dev, "%s(): urb shutting down with status: %d\n", 708 __func__, status); 709 return; 710 default: 711 dev_dbg(&urb->dev->dev, "%s(): nonzero urb status received: %d\n", 712 __func__, status); 713 break; 714 } 715 716 if (status == 0 && urb->actual_length == OTI6858_CTRL_PKT_SIZE) { 717 struct oti6858_control_pkt *xs = urb->transfer_buffer; 718 unsigned long flags; 719 720 spin_lock_irqsave(&priv->lock, flags); 721 722 if (!priv->transient) { 723 if (!OTI6858_CTRL_EQUALS_PENDING(xs, priv)) { 724 if (xs->rx_bytes_avail == 0) { 725 priv->transient = 4; 726 priv->setup_done = 0; 727 resubmit = 0; 728 dev_dbg(&port->dev, "%s(): scheduling setup_line()\n", __func__); 729 schedule_delayed_work(&priv->delayed_setup_work, 0); 730 } 731 } 732 } else { 733 if (OTI6858_CTRL_EQUALS_PENDING(xs, priv)) { 734 priv->transient = 0; 735 } else if (!priv->setup_done) { 736 resubmit = 0; 737 } else if (--priv->transient == 0) { 738 if (xs->rx_bytes_avail == 0) { 739 priv->transient = 4; 740 priv->setup_done = 0; 741 resubmit = 0; 742 dev_dbg(&port->dev, "%s(): scheduling setup_line()\n", __func__); 743 schedule_delayed_work(&priv->delayed_setup_work, 0); 744 } 745 } 746 } 747 748 if (!priv->transient) { 749 if (xs->pin_state != priv->status.pin_state) 750 wake_up_interruptible(&port->port.delta_msr_wait); 751 memcpy(&priv->status, xs, OTI6858_CTRL_PKT_SIZE); 752 } 753 754 if (!priv->transient && xs->rx_bytes_avail != 0) { 755 can_recv = xs->rx_bytes_avail; 756 priv->flags.read_urb_in_use = 1; 757 } 758 759 transient = priv->transient; 760 spin_unlock_irqrestore(&priv->lock, flags); 761 } 762 763 if (can_recv) { 764 int result; 765 766 result = usb_submit_urb(port->read_urb, GFP_ATOMIC); 767 if (result != 0) { 768 priv->flags.read_urb_in_use = 0; 769 dev_err(&port->dev, "%s(): usb_submit_urb() failed," 770 " error %d\n", __func__, result); 771 } else { 772 resubmit = 0; 773 } 774 } else if (!transient) { 775 unsigned long flags; 776 int count; 777 778 spin_lock_irqsave(&port->lock, flags); 779 count = kfifo_len(&port->write_fifo); 780 spin_unlock_irqrestore(&port->lock, flags); 781 782 spin_lock_irqsave(&priv->lock, flags); 783 if (priv->flags.write_urb_in_use == 0 && count != 0) { 784 schedule_delayed_work(&priv->delayed_write_work, 0); 785 resubmit = 0; 786 } 787 spin_unlock_irqrestore(&priv->lock, flags); 788 } 789 790 if (resubmit) { 791 int result; 792 793 /* dev_dbg(&urb->dev->dev, "%s(): submitting interrupt urb\n", __func__); */ 794 result = usb_submit_urb(urb, GFP_ATOMIC); 795 if (result != 0) { 796 dev_err(&urb->dev->dev, 797 "%s(): usb_submit_urb() failed with" 798 " error %d\n", __func__, result); 799 } 800 } 801 } 802 803 static void oti6858_read_bulk_callback(struct urb *urb) 804 { 805 struct usb_serial_port *port = urb->context; 806 struct oti6858_private *priv = usb_get_serial_port_data(port); 807 unsigned char *data = urb->transfer_buffer; 808 unsigned long flags; 809 int status = urb->status; 810 int result; 811 812 spin_lock_irqsave(&priv->lock, flags); 813 priv->flags.read_urb_in_use = 0; 814 spin_unlock_irqrestore(&priv->lock, flags); 815 816 if (status != 0) { 817 dev_dbg(&urb->dev->dev, "%s(): unable to handle the error, exiting\n", __func__); 818 return; 819 } 820 821 if (urb->actual_length > 0) { 822 tty_insert_flip_string(&port->port, data, urb->actual_length); 823 tty_flip_buffer_push(&port->port); 824 } 825 826 /* schedule the interrupt urb */ 827 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC); 828 if (result != 0 && result != -EPERM) { 829 dev_err(&port->dev, "%s(): usb_submit_urb() failed," 830 " error %d\n", __func__, result); 831 } 832 } 833 834 static void oti6858_write_bulk_callback(struct urb *urb) 835 { 836 struct usb_serial_port *port = urb->context; 837 struct oti6858_private *priv = usb_get_serial_port_data(port); 838 int status = urb->status; 839 int result; 840 841 switch (status) { 842 case 0: 843 /* success */ 844 break; 845 case -ECONNRESET: 846 case -ENOENT: 847 case -ESHUTDOWN: 848 /* this urb is terminated, clean up */ 849 dev_dbg(&urb->dev->dev, "%s(): urb shutting down with status: %d\n", __func__, status); 850 priv->flags.write_urb_in_use = 0; 851 return; 852 default: 853 /* error in the urb, so we have to resubmit it */ 854 dev_dbg(&urb->dev->dev, "%s(): nonzero write bulk status received: %d\n", __func__, status); 855 dev_dbg(&urb->dev->dev, "%s(): overflow in write\n", __func__); 856 857 port->write_urb->transfer_buffer_length = 1; 858 result = usb_submit_urb(port->write_urb, GFP_ATOMIC); 859 if (result) { 860 dev_err_console(port, "%s(): usb_submit_urb() failed," 861 " error %d\n", __func__, result); 862 } else { 863 return; 864 } 865 } 866 867 priv->flags.write_urb_in_use = 0; 868 869 /* schedule the interrupt urb if we are still open */ 870 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__); 871 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC); 872 if (result != 0) { 873 dev_err(&port->dev, "%s(): failed submitting int urb," 874 " error %d\n", __func__, result); 875 } 876 } 877 878 module_usb_serial_driver(serial_drivers, id_table); 879 880 MODULE_DESCRIPTION(OTI6858_DESCRIPTION); 881 MODULE_AUTHOR(OTI6858_AUTHOR); 882 MODULE_LICENSE("GPL"); 883