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/slab.h> 43 #include <linux/tty.h> 44 #include <linux/tty_driver.h> 45 #include <linux/tty_flip.h> 46 #include <linux/serial.h> 47 #include <linux/module.h> 48 #include <linux/moduleparam.h> 49 #include <linux/spinlock.h> 50 #include <linux/usb.h> 51 #include <linux/usb/serial.h> 52 #include <linux/uaccess.h> 53 #include <linux/kfifo.h> 54 #include "oti6858.h" 55 56 #define OTI6858_DESCRIPTION \ 57 "Ours Technology Inc. OTi-6858 USB to serial adapter driver" 58 #define OTI6858_AUTHOR "Tomasz Michal Lukaszewski <FIXME@FIXME>" 59 60 static const struct usb_device_id id_table[] = { 61 { USB_DEVICE(OTI6858_VENDOR_ID, OTI6858_PRODUCT_ID) }, 62 { } 63 }; 64 65 MODULE_DEVICE_TABLE(usb, id_table); 66 67 /* requests */ 68 #define OTI6858_REQ_GET_STATUS (USB_DIR_IN | USB_TYPE_VENDOR | 0x00) 69 #define OTI6858_REQ_T_GET_STATUS 0x01 70 71 #define OTI6858_REQ_SET_LINE (USB_DIR_OUT | USB_TYPE_VENDOR | 0x00) 72 #define OTI6858_REQ_T_SET_LINE 0x00 73 74 #define OTI6858_REQ_CHECK_TXBUFF (USB_DIR_IN | USB_TYPE_VENDOR | 0x01) 75 #define OTI6858_REQ_T_CHECK_TXBUFF 0x00 76 77 /* format of the control packet */ 78 struct oti6858_control_pkt { 79 __le16 divisor; /* baud rate = 96000000 / (16 * divisor), LE */ 80 #define OTI6858_MAX_BAUD_RATE 3000000 81 u8 frame_fmt; 82 #define FMT_STOP_BITS_MASK 0xc0 83 #define FMT_STOP_BITS_1 0x00 84 #define FMT_STOP_BITS_2 0x40 /* 1.5 stop bits if FMT_DATA_BITS_5 */ 85 #define FMT_PARITY_MASK 0x38 86 #define FMT_PARITY_NONE 0x00 87 #define FMT_PARITY_ODD 0x08 88 #define FMT_PARITY_EVEN 0x18 89 #define FMT_PARITY_MARK 0x28 90 #define FMT_PARITY_SPACE 0x38 91 #define FMT_DATA_BITS_MASK 0x03 92 #define FMT_DATA_BITS_5 0x00 93 #define FMT_DATA_BITS_6 0x01 94 #define FMT_DATA_BITS_7 0x02 95 #define FMT_DATA_BITS_8 0x03 96 u8 something; /* always equals 0x43 */ 97 u8 control; /* settings of flow control lines */ 98 #define CONTROL_MASK 0x0c 99 #define CONTROL_DTR_HIGH 0x08 100 #define CONTROL_RTS_HIGH 0x04 101 u8 tx_status; 102 #define TX_BUFFER_EMPTIED 0x09 103 u8 pin_state; 104 #define PIN_MASK 0x3f 105 #define PIN_MSR_MASK 0x1b 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_attach(struct usb_serial *serial); 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 .attach = oti6858_attach, 163 .port_probe = oti6858_port_probe, 164 .port_remove = oti6858_port_remove, 165 }; 166 167 static struct usb_serial_driver * const serial_drivers[] = { 168 &oti6858_device, NULL 169 }; 170 171 struct oti6858_private { 172 spinlock_t lock; 173 174 struct oti6858_control_pkt status; 175 176 struct { 177 u8 read_urb_in_use; 178 u8 write_urb_in_use; 179 } flags; 180 struct delayed_work delayed_write_work; 181 182 struct { 183 __le16 divisor; 184 u8 frame_fmt; 185 u8 control; 186 } pending_setup; 187 u8 transient; 188 u8 setup_done; 189 struct delayed_work delayed_setup_work; 190 191 struct usb_serial_port *port; /* USB port with which associated */ 192 }; 193 194 static void setup_line(struct work_struct *work) 195 { 196 struct oti6858_private *priv = container_of(work, 197 struct oti6858_private, delayed_setup_work.work); 198 struct usb_serial_port *port = priv->port; 199 struct oti6858_control_pkt *new_setup; 200 unsigned long flags; 201 int result; 202 203 new_setup = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL); 204 if (!new_setup) { 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 return; 292 293 result = usb_control_msg(port->serial->dev, 294 usb_rcvctrlpipe(port->serial->dev, 0), 295 OTI6858_REQ_T_CHECK_TXBUFF, 296 OTI6858_REQ_CHECK_TXBUFF, 297 count, 0, allow, 1, 100); 298 if (result != 1 || *allow != 0) 299 count = 0; 300 kfree(allow); 301 } 302 303 if (count == 0) { 304 priv->flags.write_urb_in_use = 0; 305 306 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__); 307 result = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO); 308 if (result != 0) { 309 dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n", 310 __func__, result); 311 } 312 return; 313 } 314 315 count = kfifo_out_locked(&port->write_fifo, 316 port->write_urb->transfer_buffer, 317 count, &port->lock); 318 port->write_urb->transfer_buffer_length = count; 319 result = usb_submit_urb(port->write_urb, GFP_NOIO); 320 if (result != 0) { 321 dev_err_console(port, "%s(): usb_submit_urb() failed with error %d\n", 322 __func__, result); 323 priv->flags.write_urb_in_use = 0; 324 } 325 326 usb_serial_port_softint(port); 327 } 328 329 static int oti6858_attach(struct usb_serial *serial) 330 { 331 unsigned char num_ports = serial->num_ports; 332 333 if (serial->num_bulk_in < num_ports || 334 serial->num_bulk_out < num_ports || 335 serial->num_interrupt_in < num_ports) { 336 dev_err(&serial->interface->dev, "missing endpoints\n"); 337 return -ENODEV; 338 } 339 340 return 0; 341 } 342 343 static int oti6858_port_probe(struct usb_serial_port *port) 344 { 345 struct oti6858_private *priv; 346 347 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 348 if (!priv) 349 return -ENOMEM; 350 351 spin_lock_init(&priv->lock); 352 priv->port = port; 353 INIT_DELAYED_WORK(&priv->delayed_setup_work, setup_line); 354 INIT_DELAYED_WORK(&priv->delayed_write_work, send_data); 355 356 usb_set_serial_port_data(port, priv); 357 358 port->port.drain_delay = 256; /* FIXME: check the FIFO length */ 359 360 return 0; 361 } 362 363 static int oti6858_port_remove(struct usb_serial_port *port) 364 { 365 struct oti6858_private *priv; 366 367 priv = usb_get_serial_port_data(port); 368 kfree(priv); 369 370 return 0; 371 } 372 373 static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port, 374 const unsigned char *buf, int count) 375 { 376 if (!count) 377 return count; 378 379 count = kfifo_in_locked(&port->write_fifo, buf, count, &port->lock); 380 381 return count; 382 } 383 384 static int oti6858_write_room(struct tty_struct *tty) 385 { 386 struct usb_serial_port *port = tty->driver_data; 387 int room = 0; 388 unsigned long flags; 389 390 spin_lock_irqsave(&port->lock, flags); 391 room = kfifo_avail(&port->write_fifo); 392 spin_unlock_irqrestore(&port->lock, flags); 393 394 return room; 395 } 396 397 static int oti6858_chars_in_buffer(struct tty_struct *tty) 398 { 399 struct usb_serial_port *port = tty->driver_data; 400 int chars = 0; 401 unsigned long flags; 402 403 spin_lock_irqsave(&port->lock, flags); 404 chars = kfifo_len(&port->write_fifo); 405 spin_unlock_irqrestore(&port->lock, flags); 406 407 return chars; 408 } 409 410 static void oti6858_init_termios(struct tty_struct *tty) 411 { 412 tty->termios = tty_std_termios; 413 tty->termios.c_cflag = B38400 | CS8 | CREAD | HUPCL | CLOCAL; 414 tty->termios.c_ispeed = 38400; 415 tty->termios.c_ospeed = 38400; 416 } 417 418 static void oti6858_set_termios(struct tty_struct *tty, 419 struct usb_serial_port *port, struct ktermios *old_termios) 420 { 421 struct oti6858_private *priv = usb_get_serial_port_data(port); 422 unsigned long flags; 423 unsigned int cflag; 424 u8 frame_fmt, control; 425 __le16 divisor; 426 int br; 427 428 cflag = tty->termios.c_cflag; 429 430 spin_lock_irqsave(&priv->lock, flags); 431 divisor = priv->pending_setup.divisor; 432 frame_fmt = priv->pending_setup.frame_fmt; 433 control = priv->pending_setup.control; 434 spin_unlock_irqrestore(&priv->lock, flags); 435 436 frame_fmt &= ~FMT_DATA_BITS_MASK; 437 switch (cflag & CSIZE) { 438 case CS5: 439 frame_fmt |= FMT_DATA_BITS_5; 440 break; 441 case CS6: 442 frame_fmt |= FMT_DATA_BITS_6; 443 break; 444 case CS7: 445 frame_fmt |= FMT_DATA_BITS_7; 446 break; 447 default: 448 case CS8: 449 frame_fmt |= FMT_DATA_BITS_8; 450 break; 451 } 452 453 /* manufacturer claims that this device can work with baud rates 454 * up to 3 Mbps; I've tested it only on 115200 bps, so I can't 455 * guarantee that any other baud rate will work (especially 456 * the higher ones) 457 */ 458 br = tty_get_baud_rate(tty); 459 if (br == 0) { 460 divisor = 0; 461 } else { 462 int real_br; 463 int new_divisor; 464 br = min(br, OTI6858_MAX_BAUD_RATE); 465 466 new_divisor = (96000000 + 8 * br) / (16 * br); 467 real_br = 96000000 / (16 * new_divisor); 468 divisor = cpu_to_le16(new_divisor); 469 tty_encode_baud_rate(tty, real_br, real_br); 470 } 471 472 frame_fmt &= ~FMT_STOP_BITS_MASK; 473 if ((cflag & CSTOPB) != 0) 474 frame_fmt |= FMT_STOP_BITS_2; 475 else 476 frame_fmt |= FMT_STOP_BITS_1; 477 478 frame_fmt &= ~FMT_PARITY_MASK; 479 if ((cflag & PARENB) != 0) { 480 if ((cflag & PARODD) != 0) 481 frame_fmt |= FMT_PARITY_ODD; 482 else 483 frame_fmt |= FMT_PARITY_EVEN; 484 } else { 485 frame_fmt |= FMT_PARITY_NONE; 486 } 487 488 control &= ~CONTROL_MASK; 489 if ((cflag & CRTSCTS) != 0) 490 control |= (CONTROL_DTR_HIGH | CONTROL_RTS_HIGH); 491 492 /* change control lines if we are switching to or from B0 */ 493 /* FIXME: 494 spin_lock_irqsave(&priv->lock, flags); 495 control = priv->line_control; 496 if ((cflag & CBAUD) == B0) 497 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS); 498 else 499 priv->line_control |= (CONTROL_DTR | CONTROL_RTS); 500 if (control != priv->line_control) { 501 control = priv->line_control; 502 spin_unlock_irqrestore(&priv->lock, flags); 503 set_control_lines(serial->dev, control); 504 } else { 505 spin_unlock_irqrestore(&priv->lock, flags); 506 } 507 */ 508 509 spin_lock_irqsave(&priv->lock, flags); 510 if (divisor != priv->pending_setup.divisor 511 || control != priv->pending_setup.control 512 || frame_fmt != priv->pending_setup.frame_fmt) { 513 priv->pending_setup.divisor = divisor; 514 priv->pending_setup.control = control; 515 priv->pending_setup.frame_fmt = frame_fmt; 516 } 517 spin_unlock_irqrestore(&priv->lock, flags); 518 } 519 520 static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port) 521 { 522 struct oti6858_private *priv = usb_get_serial_port_data(port); 523 struct usb_serial *serial = port->serial; 524 struct oti6858_control_pkt *buf; 525 unsigned long flags; 526 int result; 527 528 usb_clear_halt(serial->dev, port->write_urb->pipe); 529 usb_clear_halt(serial->dev, port->read_urb->pipe); 530 531 buf = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL); 532 if (!buf) 533 return -ENOMEM; 534 535 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 536 OTI6858_REQ_T_GET_STATUS, 537 OTI6858_REQ_GET_STATUS, 538 0, 0, 539 buf, OTI6858_CTRL_PKT_SIZE, 540 100); 541 if (result != OTI6858_CTRL_PKT_SIZE) { 542 /* assume default (after power-on reset) values */ 543 buf->divisor = cpu_to_le16(0x009c); /* 38400 bps */ 544 buf->frame_fmt = 0x03; /* 8N1 */ 545 buf->something = 0x43; 546 buf->control = 0x4c; /* DTR, RTS */ 547 buf->tx_status = 0x00; 548 buf->pin_state = 0x5b; /* RTS, CTS, DSR, DTR, RI, DCD */ 549 buf->rx_bytes_avail = 0x00; 550 } 551 552 spin_lock_irqsave(&priv->lock, flags); 553 memcpy(&priv->status, buf, OTI6858_CTRL_PKT_SIZE); 554 priv->pending_setup.divisor = buf->divisor; 555 priv->pending_setup.frame_fmt = buf->frame_fmt; 556 priv->pending_setup.control = buf->control; 557 spin_unlock_irqrestore(&priv->lock, flags); 558 kfree(buf); 559 560 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__); 561 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); 562 if (result != 0) { 563 dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n", 564 __func__, result); 565 oti6858_close(port); 566 return result; 567 } 568 569 /* setup termios */ 570 if (tty) 571 oti6858_set_termios(tty, port, NULL); 572 573 return 0; 574 } 575 576 static void oti6858_close(struct usb_serial_port *port) 577 { 578 struct oti6858_private *priv = usb_get_serial_port_data(port); 579 unsigned long flags; 580 581 spin_lock_irqsave(&port->lock, flags); 582 /* clear out any remaining data in the buffer */ 583 kfifo_reset_out(&port->write_fifo); 584 spin_unlock_irqrestore(&port->lock, flags); 585 586 dev_dbg(&port->dev, "%s(): after buf_clear()\n", __func__); 587 588 /* cancel scheduled setup */ 589 cancel_delayed_work_sync(&priv->delayed_setup_work); 590 cancel_delayed_work_sync(&priv->delayed_write_work); 591 592 /* shutdown our urbs */ 593 dev_dbg(&port->dev, "%s(): shutting down urbs\n", __func__); 594 usb_kill_urb(port->write_urb); 595 usb_kill_urb(port->read_urb); 596 usb_kill_urb(port->interrupt_in_urb); 597 } 598 599 static int oti6858_tiocmset(struct tty_struct *tty, 600 unsigned int set, unsigned int clear) 601 { 602 struct usb_serial_port *port = tty->driver_data; 603 struct oti6858_private *priv = usb_get_serial_port_data(port); 604 unsigned long flags; 605 u8 control; 606 607 dev_dbg(&port->dev, "%s(set = 0x%08x, clear = 0x%08x)\n", 608 __func__, set, clear); 609 610 /* FIXME: check if this is correct (active high/low) */ 611 spin_lock_irqsave(&priv->lock, flags); 612 control = priv->pending_setup.control; 613 if ((set & TIOCM_RTS) != 0) 614 control |= CONTROL_RTS_HIGH; 615 if ((set & TIOCM_DTR) != 0) 616 control |= CONTROL_DTR_HIGH; 617 if ((clear & TIOCM_RTS) != 0) 618 control &= ~CONTROL_RTS_HIGH; 619 if ((clear & TIOCM_DTR) != 0) 620 control &= ~CONTROL_DTR_HIGH; 621 622 if (control != priv->pending_setup.control) 623 priv->pending_setup.control = control; 624 625 spin_unlock_irqrestore(&priv->lock, flags); 626 return 0; 627 } 628 629 static int oti6858_tiocmget(struct tty_struct *tty) 630 { 631 struct usb_serial_port *port = tty->driver_data; 632 struct oti6858_private *priv = usb_get_serial_port_data(port); 633 unsigned long flags; 634 unsigned pin_state; 635 unsigned result = 0; 636 637 spin_lock_irqsave(&priv->lock, flags); 638 pin_state = priv->status.pin_state & PIN_MASK; 639 spin_unlock_irqrestore(&priv->lock, flags); 640 641 /* FIXME: check if this is correct (active high/low) */ 642 if ((pin_state & PIN_RTS) != 0) 643 result |= TIOCM_RTS; 644 if ((pin_state & PIN_CTS) != 0) 645 result |= TIOCM_CTS; 646 if ((pin_state & PIN_DSR) != 0) 647 result |= TIOCM_DSR; 648 if ((pin_state & PIN_DTR) != 0) 649 result |= TIOCM_DTR; 650 if ((pin_state & PIN_RI) != 0) 651 result |= TIOCM_RI; 652 if ((pin_state & PIN_DCD) != 0) 653 result |= TIOCM_CD; 654 655 dev_dbg(&port->dev, "%s() = 0x%08x\n", __func__, result); 656 657 return result; 658 } 659 660 static void oti6858_read_int_callback(struct urb *urb) 661 { 662 struct usb_serial_port *port = urb->context; 663 struct oti6858_private *priv = usb_get_serial_port_data(port); 664 int transient = 0, can_recv = 0, resubmit = 1; 665 int status = urb->status; 666 667 switch (status) { 668 case 0: 669 /* success */ 670 break; 671 case -ECONNRESET: 672 case -ENOENT: 673 case -ESHUTDOWN: 674 /* this urb is terminated, clean up */ 675 dev_dbg(&urb->dev->dev, "%s(): urb shutting down with status: %d\n", 676 __func__, status); 677 return; 678 default: 679 dev_dbg(&urb->dev->dev, "%s(): nonzero urb status received: %d\n", 680 __func__, status); 681 break; 682 } 683 684 if (status == 0 && urb->actual_length == OTI6858_CTRL_PKT_SIZE) { 685 struct oti6858_control_pkt *xs = urb->transfer_buffer; 686 unsigned long flags; 687 688 spin_lock_irqsave(&priv->lock, flags); 689 690 if (!priv->transient) { 691 if (!OTI6858_CTRL_EQUALS_PENDING(xs, priv)) { 692 if (xs->rx_bytes_avail == 0) { 693 priv->transient = 4; 694 priv->setup_done = 0; 695 resubmit = 0; 696 dev_dbg(&port->dev, "%s(): scheduling setup_line()\n", __func__); 697 schedule_delayed_work(&priv->delayed_setup_work, 0); 698 } 699 } 700 } else { 701 if (OTI6858_CTRL_EQUALS_PENDING(xs, priv)) { 702 priv->transient = 0; 703 } else if (!priv->setup_done) { 704 resubmit = 0; 705 } else if (--priv->transient == 0) { 706 if (xs->rx_bytes_avail == 0) { 707 priv->transient = 4; 708 priv->setup_done = 0; 709 resubmit = 0; 710 dev_dbg(&port->dev, "%s(): scheduling setup_line()\n", __func__); 711 schedule_delayed_work(&priv->delayed_setup_work, 0); 712 } 713 } 714 } 715 716 if (!priv->transient) { 717 u8 delta = xs->pin_state ^ priv->status.pin_state; 718 719 if (delta & PIN_MSR_MASK) { 720 if (delta & PIN_CTS) 721 port->icount.cts++; 722 if (delta & PIN_DSR) 723 port->icount.dsr++; 724 if (delta & PIN_RI) 725 port->icount.rng++; 726 if (delta & PIN_DCD) 727 port->icount.dcd++; 728 729 wake_up_interruptible(&port->port.delta_msr_wait); 730 } 731 732 memcpy(&priv->status, xs, OTI6858_CTRL_PKT_SIZE); 733 } 734 735 if (!priv->transient && xs->rx_bytes_avail != 0) { 736 can_recv = xs->rx_bytes_avail; 737 priv->flags.read_urb_in_use = 1; 738 } 739 740 transient = priv->transient; 741 spin_unlock_irqrestore(&priv->lock, flags); 742 } 743 744 if (can_recv) { 745 int result; 746 747 result = usb_submit_urb(port->read_urb, GFP_ATOMIC); 748 if (result != 0) { 749 priv->flags.read_urb_in_use = 0; 750 dev_err(&port->dev, "%s(): usb_submit_urb() failed," 751 " error %d\n", __func__, result); 752 } else { 753 resubmit = 0; 754 } 755 } else if (!transient) { 756 unsigned long flags; 757 int count; 758 759 spin_lock_irqsave(&port->lock, flags); 760 count = kfifo_len(&port->write_fifo); 761 spin_unlock_irqrestore(&port->lock, flags); 762 763 spin_lock_irqsave(&priv->lock, flags); 764 if (priv->flags.write_urb_in_use == 0 && count != 0) { 765 schedule_delayed_work(&priv->delayed_write_work, 0); 766 resubmit = 0; 767 } 768 spin_unlock_irqrestore(&priv->lock, flags); 769 } 770 771 if (resubmit) { 772 int result; 773 774 /* dev_dbg(&urb->dev->dev, "%s(): submitting interrupt urb\n", __func__); */ 775 result = usb_submit_urb(urb, GFP_ATOMIC); 776 if (result != 0) { 777 dev_err(&urb->dev->dev, 778 "%s(): usb_submit_urb() failed with" 779 " error %d\n", __func__, result); 780 } 781 } 782 } 783 784 static void oti6858_read_bulk_callback(struct urb *urb) 785 { 786 struct usb_serial_port *port = urb->context; 787 struct oti6858_private *priv = usb_get_serial_port_data(port); 788 unsigned char *data = urb->transfer_buffer; 789 unsigned long flags; 790 int status = urb->status; 791 int result; 792 793 spin_lock_irqsave(&priv->lock, flags); 794 priv->flags.read_urb_in_use = 0; 795 spin_unlock_irqrestore(&priv->lock, flags); 796 797 if (status != 0) { 798 dev_dbg(&urb->dev->dev, "%s(): unable to handle the error, exiting\n", __func__); 799 return; 800 } 801 802 if (urb->actual_length > 0) { 803 tty_insert_flip_string(&port->port, data, urb->actual_length); 804 tty_flip_buffer_push(&port->port); 805 } 806 807 /* schedule the interrupt urb */ 808 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC); 809 if (result != 0 && result != -EPERM) { 810 dev_err(&port->dev, "%s(): usb_submit_urb() failed," 811 " error %d\n", __func__, result); 812 } 813 } 814 815 static void oti6858_write_bulk_callback(struct urb *urb) 816 { 817 struct usb_serial_port *port = urb->context; 818 struct oti6858_private *priv = usb_get_serial_port_data(port); 819 int status = urb->status; 820 int result; 821 822 switch (status) { 823 case 0: 824 /* success */ 825 break; 826 case -ECONNRESET: 827 case -ENOENT: 828 case -ESHUTDOWN: 829 /* this urb is terminated, clean up */ 830 dev_dbg(&urb->dev->dev, "%s(): urb shutting down with status: %d\n", __func__, status); 831 priv->flags.write_urb_in_use = 0; 832 return; 833 default: 834 /* error in the urb, so we have to resubmit it */ 835 dev_dbg(&urb->dev->dev, "%s(): nonzero write bulk status received: %d\n", __func__, status); 836 dev_dbg(&urb->dev->dev, "%s(): overflow in write\n", __func__); 837 838 port->write_urb->transfer_buffer_length = 1; 839 result = usb_submit_urb(port->write_urb, GFP_ATOMIC); 840 if (result) { 841 dev_err_console(port, "%s(): usb_submit_urb() failed," 842 " error %d\n", __func__, result); 843 } else { 844 return; 845 } 846 } 847 848 priv->flags.write_urb_in_use = 0; 849 850 /* schedule the interrupt urb if we are still open */ 851 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__); 852 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC); 853 if (result != 0) { 854 dev_err(&port->dev, "%s(): failed submitting int urb," 855 " error %d\n", __func__, result); 856 } 857 } 858 859 module_usb_serial_driver(serial_drivers, id_table); 860 861 MODULE_DESCRIPTION(OTI6858_DESCRIPTION); 862 MODULE_AUTHOR(OTI6858_AUTHOR); 863 MODULE_LICENSE("GPL"); 864