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_port_probe(struct usb_serial_port *port); 138 static int oti6858_port_remove(struct usb_serial_port *port); 139 140 /* device info */ 141 static struct usb_serial_driver oti6858_device = { 142 .driver = { 143 .owner = THIS_MODULE, 144 .name = "oti6858", 145 }, 146 .id_table = id_table, 147 .num_ports = 1, 148 .num_bulk_in = 1, 149 .num_bulk_out = 1, 150 .num_interrupt_in = 1, 151 .open = oti6858_open, 152 .close = oti6858_close, 153 .write = oti6858_write, 154 .set_termios = oti6858_set_termios, 155 .init_termios = oti6858_init_termios, 156 .tiocmget = oti6858_tiocmget, 157 .tiocmset = oti6858_tiocmset, 158 .tiocmiwait = usb_serial_generic_tiocmiwait, 159 .read_bulk_callback = oti6858_read_bulk_callback, 160 .read_int_callback = oti6858_read_int_callback, 161 .write_bulk_callback = oti6858_write_bulk_callback, 162 .write_room = oti6858_write_room, 163 .chars_in_buffer = oti6858_chars_in_buffer, 164 .port_probe = oti6858_port_probe, 165 .port_remove = oti6858_port_remove, 166 }; 167 168 static struct usb_serial_driver * const serial_drivers[] = { 169 &oti6858_device, NULL 170 }; 171 172 struct oti6858_private { 173 spinlock_t lock; 174 175 struct oti6858_control_pkt status; 176 177 struct { 178 u8 read_urb_in_use; 179 u8 write_urb_in_use; 180 } flags; 181 struct delayed_work delayed_write_work; 182 183 struct { 184 __le16 divisor; 185 u8 frame_fmt; 186 u8 control; 187 } pending_setup; 188 u8 transient; 189 u8 setup_done; 190 struct delayed_work delayed_setup_work; 191 192 struct usb_serial_port *port; /* USB port with which associated */ 193 }; 194 195 static void setup_line(struct work_struct *work) 196 { 197 struct oti6858_private *priv = container_of(work, 198 struct oti6858_private, delayed_setup_work.work); 199 struct usb_serial_port *port = priv->port; 200 struct oti6858_control_pkt *new_setup; 201 unsigned long flags; 202 int result; 203 204 new_setup = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL); 205 if (!new_setup) { 206 /* we will try again */ 207 schedule_delayed_work(&priv->delayed_setup_work, 208 msecs_to_jiffies(2)); 209 return; 210 } 211 212 result = usb_control_msg(port->serial->dev, 213 usb_rcvctrlpipe(port->serial->dev, 0), 214 OTI6858_REQ_T_GET_STATUS, 215 OTI6858_REQ_GET_STATUS, 216 0, 0, 217 new_setup, OTI6858_CTRL_PKT_SIZE, 218 100); 219 220 if (result != OTI6858_CTRL_PKT_SIZE) { 221 dev_err(&port->dev, "%s(): error reading status\n", __func__); 222 kfree(new_setup); 223 /* we will try again */ 224 schedule_delayed_work(&priv->delayed_setup_work, 225 msecs_to_jiffies(2)); 226 return; 227 } 228 229 spin_lock_irqsave(&priv->lock, flags); 230 if (!OTI6858_CTRL_EQUALS_PENDING(new_setup, priv)) { 231 new_setup->divisor = priv->pending_setup.divisor; 232 new_setup->control = priv->pending_setup.control; 233 new_setup->frame_fmt = priv->pending_setup.frame_fmt; 234 235 spin_unlock_irqrestore(&priv->lock, flags); 236 result = usb_control_msg(port->serial->dev, 237 usb_sndctrlpipe(port->serial->dev, 0), 238 OTI6858_REQ_T_SET_LINE, 239 OTI6858_REQ_SET_LINE, 240 0, 0, 241 new_setup, OTI6858_CTRL_PKT_SIZE, 242 100); 243 } else { 244 spin_unlock_irqrestore(&priv->lock, flags); 245 result = 0; 246 } 247 kfree(new_setup); 248 249 spin_lock_irqsave(&priv->lock, flags); 250 if (result != OTI6858_CTRL_PKT_SIZE) 251 priv->transient = 0; 252 priv->setup_done = 1; 253 spin_unlock_irqrestore(&priv->lock, flags); 254 255 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__); 256 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); 257 if (result != 0) { 258 dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n", 259 __func__, result); 260 } 261 } 262 263 static void send_data(struct work_struct *work) 264 { 265 struct oti6858_private *priv = container_of(work, 266 struct oti6858_private, delayed_write_work.work); 267 struct usb_serial_port *port = priv->port; 268 int count = 0, result; 269 unsigned long flags; 270 u8 *allow; 271 272 spin_lock_irqsave(&priv->lock, flags); 273 if (priv->flags.write_urb_in_use) { 274 spin_unlock_irqrestore(&priv->lock, flags); 275 schedule_delayed_work(&priv->delayed_write_work, 276 msecs_to_jiffies(2)); 277 return; 278 } 279 priv->flags.write_urb_in_use = 1; 280 spin_unlock_irqrestore(&priv->lock, flags); 281 282 spin_lock_irqsave(&port->lock, flags); 283 count = kfifo_len(&port->write_fifo); 284 spin_unlock_irqrestore(&port->lock, flags); 285 286 if (count > port->bulk_out_size) 287 count = port->bulk_out_size; 288 289 if (count != 0) { 290 allow = kmalloc(1, GFP_KERNEL); 291 if (!allow) 292 return; 293 294 result = usb_control_msg(port->serial->dev, 295 usb_rcvctrlpipe(port->serial->dev, 0), 296 OTI6858_REQ_T_CHECK_TXBUFF, 297 OTI6858_REQ_CHECK_TXBUFF, 298 count, 0, allow, 1, 100); 299 if (result != 1 || *allow != 0) 300 count = 0; 301 kfree(allow); 302 } 303 304 if (count == 0) { 305 priv->flags.write_urb_in_use = 0; 306 307 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__); 308 result = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO); 309 if (result != 0) { 310 dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n", 311 __func__, result); 312 } 313 return; 314 } 315 316 count = kfifo_out_locked(&port->write_fifo, 317 port->write_urb->transfer_buffer, 318 count, &port->lock); 319 port->write_urb->transfer_buffer_length = count; 320 result = usb_submit_urb(port->write_urb, GFP_NOIO); 321 if (result != 0) { 322 dev_err_console(port, "%s(): usb_submit_urb() failed with error %d\n", 323 __func__, result); 324 priv->flags.write_urb_in_use = 0; 325 } 326 327 usb_serial_port_softint(port); 328 } 329 330 static int oti6858_port_probe(struct usb_serial_port *port) 331 { 332 struct oti6858_private *priv; 333 334 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 335 if (!priv) 336 return -ENOMEM; 337 338 spin_lock_init(&priv->lock); 339 priv->port = port; 340 INIT_DELAYED_WORK(&priv->delayed_setup_work, setup_line); 341 INIT_DELAYED_WORK(&priv->delayed_write_work, send_data); 342 343 usb_set_serial_port_data(port, priv); 344 345 port->port.drain_delay = 256; /* FIXME: check the FIFO length */ 346 347 return 0; 348 } 349 350 static int oti6858_port_remove(struct usb_serial_port *port) 351 { 352 struct oti6858_private *priv; 353 354 priv = usb_get_serial_port_data(port); 355 kfree(priv); 356 357 return 0; 358 } 359 360 static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port, 361 const unsigned char *buf, int count) 362 { 363 if (!count) 364 return count; 365 366 count = kfifo_in_locked(&port->write_fifo, buf, count, &port->lock); 367 368 return count; 369 } 370 371 static int oti6858_write_room(struct tty_struct *tty) 372 { 373 struct usb_serial_port *port = tty->driver_data; 374 int room = 0; 375 unsigned long flags; 376 377 spin_lock_irqsave(&port->lock, flags); 378 room = kfifo_avail(&port->write_fifo); 379 spin_unlock_irqrestore(&port->lock, flags); 380 381 return room; 382 } 383 384 static int oti6858_chars_in_buffer(struct tty_struct *tty) 385 { 386 struct usb_serial_port *port = tty->driver_data; 387 int chars = 0; 388 unsigned long flags; 389 390 spin_lock_irqsave(&port->lock, flags); 391 chars = kfifo_len(&port->write_fifo); 392 spin_unlock_irqrestore(&port->lock, flags); 393 394 return chars; 395 } 396 397 static void oti6858_init_termios(struct tty_struct *tty) 398 { 399 tty->termios = tty_std_termios; 400 tty->termios.c_cflag = B38400 | CS8 | CREAD | HUPCL | CLOCAL; 401 tty->termios.c_ispeed = 38400; 402 tty->termios.c_ospeed = 38400; 403 } 404 405 static void oti6858_set_termios(struct tty_struct *tty, 406 struct usb_serial_port *port, struct ktermios *old_termios) 407 { 408 struct oti6858_private *priv = usb_get_serial_port_data(port); 409 unsigned long flags; 410 unsigned int cflag; 411 u8 frame_fmt, control; 412 __le16 divisor; 413 int br; 414 415 cflag = tty->termios.c_cflag; 416 417 spin_lock_irqsave(&priv->lock, flags); 418 divisor = priv->pending_setup.divisor; 419 frame_fmt = priv->pending_setup.frame_fmt; 420 control = priv->pending_setup.control; 421 spin_unlock_irqrestore(&priv->lock, flags); 422 423 frame_fmt &= ~FMT_DATA_BITS_MASK; 424 switch (cflag & CSIZE) { 425 case CS5: 426 frame_fmt |= FMT_DATA_BITS_5; 427 break; 428 case CS6: 429 frame_fmt |= FMT_DATA_BITS_6; 430 break; 431 case CS7: 432 frame_fmt |= FMT_DATA_BITS_7; 433 break; 434 default: 435 case CS8: 436 frame_fmt |= FMT_DATA_BITS_8; 437 break; 438 } 439 440 /* manufacturer claims that this device can work with baud rates 441 * up to 3 Mbps; I've tested it only on 115200 bps, so I can't 442 * guarantee that any other baud rate will work (especially 443 * the higher ones) 444 */ 445 br = tty_get_baud_rate(tty); 446 if (br == 0) { 447 divisor = 0; 448 } else { 449 int real_br; 450 int new_divisor; 451 br = min(br, OTI6858_MAX_BAUD_RATE); 452 453 new_divisor = (96000000 + 8 * br) / (16 * br); 454 real_br = 96000000 / (16 * new_divisor); 455 divisor = cpu_to_le16(new_divisor); 456 tty_encode_baud_rate(tty, real_br, real_br); 457 } 458 459 frame_fmt &= ~FMT_STOP_BITS_MASK; 460 if ((cflag & CSTOPB) != 0) 461 frame_fmt |= FMT_STOP_BITS_2; 462 else 463 frame_fmt |= FMT_STOP_BITS_1; 464 465 frame_fmt &= ~FMT_PARITY_MASK; 466 if ((cflag & PARENB) != 0) { 467 if ((cflag & PARODD) != 0) 468 frame_fmt |= FMT_PARITY_ODD; 469 else 470 frame_fmt |= FMT_PARITY_EVEN; 471 } else { 472 frame_fmt |= FMT_PARITY_NONE; 473 } 474 475 control &= ~CONTROL_MASK; 476 if ((cflag & CRTSCTS) != 0) 477 control |= (CONTROL_DTR_HIGH | CONTROL_RTS_HIGH); 478 479 /* change control lines if we are switching to or from B0 */ 480 /* FIXME: 481 spin_lock_irqsave(&priv->lock, flags); 482 control = priv->line_control; 483 if ((cflag & CBAUD) == B0) 484 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS); 485 else 486 priv->line_control |= (CONTROL_DTR | CONTROL_RTS); 487 if (control != priv->line_control) { 488 control = priv->line_control; 489 spin_unlock_irqrestore(&priv->lock, flags); 490 set_control_lines(serial->dev, control); 491 } else { 492 spin_unlock_irqrestore(&priv->lock, flags); 493 } 494 */ 495 496 spin_lock_irqsave(&priv->lock, flags); 497 if (divisor != priv->pending_setup.divisor 498 || control != priv->pending_setup.control 499 || frame_fmt != priv->pending_setup.frame_fmt) { 500 priv->pending_setup.divisor = divisor; 501 priv->pending_setup.control = control; 502 priv->pending_setup.frame_fmt = frame_fmt; 503 } 504 spin_unlock_irqrestore(&priv->lock, flags); 505 } 506 507 static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port) 508 { 509 struct oti6858_private *priv = usb_get_serial_port_data(port); 510 struct usb_serial *serial = port->serial; 511 struct oti6858_control_pkt *buf; 512 unsigned long flags; 513 int result; 514 515 usb_clear_halt(serial->dev, port->write_urb->pipe); 516 usb_clear_halt(serial->dev, port->read_urb->pipe); 517 518 buf = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL); 519 if (!buf) 520 return -ENOMEM; 521 522 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 523 OTI6858_REQ_T_GET_STATUS, 524 OTI6858_REQ_GET_STATUS, 525 0, 0, 526 buf, OTI6858_CTRL_PKT_SIZE, 527 100); 528 if (result != OTI6858_CTRL_PKT_SIZE) { 529 /* assume default (after power-on reset) values */ 530 buf->divisor = cpu_to_le16(0x009c); /* 38400 bps */ 531 buf->frame_fmt = 0x03; /* 8N1 */ 532 buf->something = 0x43; 533 buf->control = 0x4c; /* DTR, RTS */ 534 buf->tx_status = 0x00; 535 buf->pin_state = 0x5b; /* RTS, CTS, DSR, DTR, RI, DCD */ 536 buf->rx_bytes_avail = 0x00; 537 } 538 539 spin_lock_irqsave(&priv->lock, flags); 540 memcpy(&priv->status, buf, OTI6858_CTRL_PKT_SIZE); 541 priv->pending_setup.divisor = buf->divisor; 542 priv->pending_setup.frame_fmt = buf->frame_fmt; 543 priv->pending_setup.control = buf->control; 544 spin_unlock_irqrestore(&priv->lock, flags); 545 kfree(buf); 546 547 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__); 548 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); 549 if (result != 0) { 550 dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n", 551 __func__, result); 552 oti6858_close(port); 553 return result; 554 } 555 556 /* setup termios */ 557 if (tty) 558 oti6858_set_termios(tty, port, NULL); 559 560 return 0; 561 } 562 563 static void oti6858_close(struct usb_serial_port *port) 564 { 565 struct oti6858_private *priv = usb_get_serial_port_data(port); 566 unsigned long flags; 567 568 spin_lock_irqsave(&port->lock, flags); 569 /* clear out any remaining data in the buffer */ 570 kfifo_reset_out(&port->write_fifo); 571 spin_unlock_irqrestore(&port->lock, flags); 572 573 dev_dbg(&port->dev, "%s(): after buf_clear()\n", __func__); 574 575 /* cancel scheduled setup */ 576 cancel_delayed_work_sync(&priv->delayed_setup_work); 577 cancel_delayed_work_sync(&priv->delayed_write_work); 578 579 /* shutdown our urbs */ 580 dev_dbg(&port->dev, "%s(): shutting down urbs\n", __func__); 581 usb_kill_urb(port->write_urb); 582 usb_kill_urb(port->read_urb); 583 usb_kill_urb(port->interrupt_in_urb); 584 } 585 586 static int oti6858_tiocmset(struct tty_struct *tty, 587 unsigned int set, unsigned int clear) 588 { 589 struct usb_serial_port *port = tty->driver_data; 590 struct oti6858_private *priv = usb_get_serial_port_data(port); 591 unsigned long flags; 592 u8 control; 593 594 dev_dbg(&port->dev, "%s(set = 0x%08x, clear = 0x%08x)\n", 595 __func__, set, clear); 596 597 /* FIXME: check if this is correct (active high/low) */ 598 spin_lock_irqsave(&priv->lock, flags); 599 control = priv->pending_setup.control; 600 if ((set & TIOCM_RTS) != 0) 601 control |= CONTROL_RTS_HIGH; 602 if ((set & TIOCM_DTR) != 0) 603 control |= CONTROL_DTR_HIGH; 604 if ((clear & TIOCM_RTS) != 0) 605 control &= ~CONTROL_RTS_HIGH; 606 if ((clear & TIOCM_DTR) != 0) 607 control &= ~CONTROL_DTR_HIGH; 608 609 if (control != priv->pending_setup.control) 610 priv->pending_setup.control = control; 611 612 spin_unlock_irqrestore(&priv->lock, flags); 613 return 0; 614 } 615 616 static int oti6858_tiocmget(struct tty_struct *tty) 617 { 618 struct usb_serial_port *port = tty->driver_data; 619 struct oti6858_private *priv = usb_get_serial_port_data(port); 620 unsigned long flags; 621 unsigned pin_state; 622 unsigned result = 0; 623 624 spin_lock_irqsave(&priv->lock, flags); 625 pin_state = priv->status.pin_state & PIN_MASK; 626 spin_unlock_irqrestore(&priv->lock, flags); 627 628 /* FIXME: check if this is correct (active high/low) */ 629 if ((pin_state & PIN_RTS) != 0) 630 result |= TIOCM_RTS; 631 if ((pin_state & PIN_CTS) != 0) 632 result |= TIOCM_CTS; 633 if ((pin_state & PIN_DSR) != 0) 634 result |= TIOCM_DSR; 635 if ((pin_state & PIN_DTR) != 0) 636 result |= TIOCM_DTR; 637 if ((pin_state & PIN_RI) != 0) 638 result |= TIOCM_RI; 639 if ((pin_state & PIN_DCD) != 0) 640 result |= TIOCM_CD; 641 642 dev_dbg(&port->dev, "%s() = 0x%08x\n", __func__, result); 643 644 return result; 645 } 646 647 static void oti6858_read_int_callback(struct urb *urb) 648 { 649 struct usb_serial_port *port = urb->context; 650 struct oti6858_private *priv = usb_get_serial_port_data(port); 651 int transient = 0, can_recv = 0, resubmit = 1; 652 int status = urb->status; 653 654 switch (status) { 655 case 0: 656 /* success */ 657 break; 658 case -ECONNRESET: 659 case -ENOENT: 660 case -ESHUTDOWN: 661 /* this urb is terminated, clean up */ 662 dev_dbg(&urb->dev->dev, "%s(): urb shutting down with status: %d\n", 663 __func__, status); 664 return; 665 default: 666 dev_dbg(&urb->dev->dev, "%s(): nonzero urb status received: %d\n", 667 __func__, status); 668 break; 669 } 670 671 if (status == 0 && urb->actual_length == OTI6858_CTRL_PKT_SIZE) { 672 struct oti6858_control_pkt *xs = urb->transfer_buffer; 673 unsigned long flags; 674 675 spin_lock_irqsave(&priv->lock, flags); 676 677 if (!priv->transient) { 678 if (!OTI6858_CTRL_EQUALS_PENDING(xs, priv)) { 679 if (xs->rx_bytes_avail == 0) { 680 priv->transient = 4; 681 priv->setup_done = 0; 682 resubmit = 0; 683 dev_dbg(&port->dev, "%s(): scheduling setup_line()\n", __func__); 684 schedule_delayed_work(&priv->delayed_setup_work, 0); 685 } 686 } 687 } else { 688 if (OTI6858_CTRL_EQUALS_PENDING(xs, priv)) { 689 priv->transient = 0; 690 } else if (!priv->setup_done) { 691 resubmit = 0; 692 } else if (--priv->transient == 0) { 693 if (xs->rx_bytes_avail == 0) { 694 priv->transient = 4; 695 priv->setup_done = 0; 696 resubmit = 0; 697 dev_dbg(&port->dev, "%s(): scheduling setup_line()\n", __func__); 698 schedule_delayed_work(&priv->delayed_setup_work, 0); 699 } 700 } 701 } 702 703 if (!priv->transient) { 704 u8 delta = xs->pin_state ^ priv->status.pin_state; 705 706 if (delta & PIN_MSR_MASK) { 707 if (delta & PIN_CTS) 708 port->icount.cts++; 709 if (delta & PIN_DSR) 710 port->icount.dsr++; 711 if (delta & PIN_RI) 712 port->icount.rng++; 713 if (delta & PIN_DCD) 714 port->icount.dcd++; 715 716 wake_up_interruptible(&port->port.delta_msr_wait); 717 } 718 719 memcpy(&priv->status, xs, OTI6858_CTRL_PKT_SIZE); 720 } 721 722 if (!priv->transient && xs->rx_bytes_avail != 0) { 723 can_recv = xs->rx_bytes_avail; 724 priv->flags.read_urb_in_use = 1; 725 } 726 727 transient = priv->transient; 728 spin_unlock_irqrestore(&priv->lock, flags); 729 } 730 731 if (can_recv) { 732 int result; 733 734 result = usb_submit_urb(port->read_urb, GFP_ATOMIC); 735 if (result != 0) { 736 priv->flags.read_urb_in_use = 0; 737 dev_err(&port->dev, "%s(): usb_submit_urb() failed," 738 " error %d\n", __func__, result); 739 } else { 740 resubmit = 0; 741 } 742 } else if (!transient) { 743 unsigned long flags; 744 int count; 745 746 spin_lock_irqsave(&port->lock, flags); 747 count = kfifo_len(&port->write_fifo); 748 spin_unlock_irqrestore(&port->lock, flags); 749 750 spin_lock_irqsave(&priv->lock, flags); 751 if (priv->flags.write_urb_in_use == 0 && count != 0) { 752 schedule_delayed_work(&priv->delayed_write_work, 0); 753 resubmit = 0; 754 } 755 spin_unlock_irqrestore(&priv->lock, flags); 756 } 757 758 if (resubmit) { 759 int result; 760 761 /* dev_dbg(&urb->dev->dev, "%s(): submitting interrupt urb\n", __func__); */ 762 result = usb_submit_urb(urb, GFP_ATOMIC); 763 if (result != 0) { 764 dev_err(&urb->dev->dev, 765 "%s(): usb_submit_urb() failed with" 766 " error %d\n", __func__, result); 767 } 768 } 769 } 770 771 static void oti6858_read_bulk_callback(struct urb *urb) 772 { 773 struct usb_serial_port *port = urb->context; 774 struct oti6858_private *priv = usb_get_serial_port_data(port); 775 unsigned char *data = urb->transfer_buffer; 776 unsigned long flags; 777 int status = urb->status; 778 int result; 779 780 spin_lock_irqsave(&priv->lock, flags); 781 priv->flags.read_urb_in_use = 0; 782 spin_unlock_irqrestore(&priv->lock, flags); 783 784 if (status != 0) { 785 dev_dbg(&urb->dev->dev, "%s(): unable to handle the error, exiting\n", __func__); 786 return; 787 } 788 789 if (urb->actual_length > 0) { 790 tty_insert_flip_string(&port->port, data, urb->actual_length); 791 tty_flip_buffer_push(&port->port); 792 } 793 794 /* schedule the interrupt urb */ 795 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC); 796 if (result != 0 && result != -EPERM) { 797 dev_err(&port->dev, "%s(): usb_submit_urb() failed," 798 " error %d\n", __func__, result); 799 } 800 } 801 802 static void oti6858_write_bulk_callback(struct urb *urb) 803 { 804 struct usb_serial_port *port = urb->context; 805 struct oti6858_private *priv = usb_get_serial_port_data(port); 806 int status = urb->status; 807 int result; 808 809 switch (status) { 810 case 0: 811 /* success */ 812 break; 813 case -ECONNRESET: 814 case -ENOENT: 815 case -ESHUTDOWN: 816 /* this urb is terminated, clean up */ 817 dev_dbg(&urb->dev->dev, "%s(): urb shutting down with status: %d\n", __func__, status); 818 priv->flags.write_urb_in_use = 0; 819 return; 820 default: 821 /* error in the urb, so we have to resubmit it */ 822 dev_dbg(&urb->dev->dev, "%s(): nonzero write bulk status received: %d\n", __func__, status); 823 dev_dbg(&urb->dev->dev, "%s(): overflow in write\n", __func__); 824 825 port->write_urb->transfer_buffer_length = 1; 826 result = usb_submit_urb(port->write_urb, GFP_ATOMIC); 827 if (result) { 828 dev_err_console(port, "%s(): usb_submit_urb() failed," 829 " error %d\n", __func__, result); 830 } else { 831 return; 832 } 833 } 834 835 priv->flags.write_urb_in_use = 0; 836 837 /* schedule the interrupt urb if we are still open */ 838 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__); 839 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC); 840 if (result != 0) { 841 dev_err(&port->dev, "%s(): failed submitting int urb," 842 " error %d\n", __func__, result); 843 } 844 } 845 846 module_usb_serial_driver(serial_drivers, id_table); 847 848 MODULE_DESCRIPTION(OTI6858_DESCRIPTION); 849 MODULE_AUTHOR(OTI6858_AUTHOR); 850 MODULE_LICENSE("GPL"); 851