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 port->port.drain_delay = 256; /* FIXME: check the FIFO length */ 347 348 return 0; 349 } 350 351 static int oti6858_port_remove(struct usb_serial_port *port) 352 { 353 struct oti6858_private *priv; 354 355 priv = usb_get_serial_port_data(port); 356 kfree(priv); 357 358 return 0; 359 } 360 361 static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port, 362 const unsigned char *buf, int count) 363 { 364 if (!count) 365 return count; 366 367 count = kfifo_in_locked(&port->write_fifo, buf, count, &port->lock); 368 369 return count; 370 } 371 372 static int oti6858_write_room(struct tty_struct *tty) 373 { 374 struct usb_serial_port *port = tty->driver_data; 375 int room = 0; 376 unsigned long flags; 377 378 spin_lock_irqsave(&port->lock, flags); 379 room = kfifo_avail(&port->write_fifo); 380 spin_unlock_irqrestore(&port->lock, flags); 381 382 return room; 383 } 384 385 static int oti6858_chars_in_buffer(struct tty_struct *tty) 386 { 387 struct usb_serial_port *port = tty->driver_data; 388 int chars = 0; 389 unsigned long flags; 390 391 spin_lock_irqsave(&port->lock, flags); 392 chars = kfifo_len(&port->write_fifo); 393 spin_unlock_irqrestore(&port->lock, flags); 394 395 return chars; 396 } 397 398 static void oti6858_init_termios(struct tty_struct *tty) 399 { 400 tty->termios = tty_std_termios; 401 tty->termios.c_cflag = B38400 | CS8 | CREAD | HUPCL | CLOCAL; 402 tty->termios.c_ispeed = 38400; 403 tty->termios.c_ospeed = 38400; 404 } 405 406 static void oti6858_set_termios(struct tty_struct *tty, 407 struct usb_serial_port *port, struct ktermios *old_termios) 408 { 409 struct oti6858_private *priv = usb_get_serial_port_data(port); 410 unsigned long flags; 411 unsigned int cflag; 412 u8 frame_fmt, control; 413 __le16 divisor; 414 int br; 415 416 cflag = tty->termios.c_cflag; 417 418 spin_lock_irqsave(&priv->lock, flags); 419 divisor = priv->pending_setup.divisor; 420 frame_fmt = priv->pending_setup.frame_fmt; 421 control = priv->pending_setup.control; 422 spin_unlock_irqrestore(&priv->lock, flags); 423 424 frame_fmt &= ~FMT_DATA_BITS_MASK; 425 switch (cflag & CSIZE) { 426 case CS5: 427 frame_fmt |= FMT_DATA_BITS_5; 428 break; 429 case CS6: 430 frame_fmt |= FMT_DATA_BITS_6; 431 break; 432 case CS7: 433 frame_fmt |= FMT_DATA_BITS_7; 434 break; 435 default: 436 case CS8: 437 frame_fmt |= FMT_DATA_BITS_8; 438 break; 439 } 440 441 /* manufacturer claims that this device can work with baud rates 442 * up to 3 Mbps; I've tested it only on 115200 bps, so I can't 443 * guarantee that any other baud rate will work (especially 444 * the higher ones) 445 */ 446 br = tty_get_baud_rate(tty); 447 if (br == 0) { 448 divisor = 0; 449 } else { 450 int real_br; 451 int new_divisor; 452 br = min(br, OTI6858_MAX_BAUD_RATE); 453 454 new_divisor = (96000000 + 8 * br) / (16 * br); 455 real_br = 96000000 / (16 * new_divisor); 456 divisor = cpu_to_le16(new_divisor); 457 tty_encode_baud_rate(tty, real_br, real_br); 458 } 459 460 frame_fmt &= ~FMT_STOP_BITS_MASK; 461 if ((cflag & CSTOPB) != 0) 462 frame_fmt |= FMT_STOP_BITS_2; 463 else 464 frame_fmt |= FMT_STOP_BITS_1; 465 466 frame_fmt &= ~FMT_PARITY_MASK; 467 if ((cflag & PARENB) != 0) { 468 if ((cflag & PARODD) != 0) 469 frame_fmt |= FMT_PARITY_ODD; 470 else 471 frame_fmt |= FMT_PARITY_EVEN; 472 } else { 473 frame_fmt |= FMT_PARITY_NONE; 474 } 475 476 control &= ~CONTROL_MASK; 477 if ((cflag & CRTSCTS) != 0) 478 control |= (CONTROL_DTR_HIGH | CONTROL_RTS_HIGH); 479 480 /* change control lines if we are switching to or from B0 */ 481 /* FIXME: 482 spin_lock_irqsave(&priv->lock, flags); 483 control = priv->line_control; 484 if ((cflag & CBAUD) == B0) 485 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS); 486 else 487 priv->line_control |= (CONTROL_DTR | CONTROL_RTS); 488 if (control != priv->line_control) { 489 control = priv->line_control; 490 spin_unlock_irqrestore(&priv->lock, flags); 491 set_control_lines(serial->dev, control); 492 } else { 493 spin_unlock_irqrestore(&priv->lock, flags); 494 } 495 */ 496 497 spin_lock_irqsave(&priv->lock, flags); 498 if (divisor != priv->pending_setup.divisor 499 || control != priv->pending_setup.control 500 || frame_fmt != priv->pending_setup.frame_fmt) { 501 priv->pending_setup.divisor = divisor; 502 priv->pending_setup.control = control; 503 priv->pending_setup.frame_fmt = frame_fmt; 504 } 505 spin_unlock_irqrestore(&priv->lock, flags); 506 } 507 508 static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port) 509 { 510 struct oti6858_private *priv = usb_get_serial_port_data(port); 511 struct usb_serial *serial = port->serial; 512 struct oti6858_control_pkt *buf; 513 unsigned long flags; 514 int result; 515 516 usb_clear_halt(serial->dev, port->write_urb->pipe); 517 usb_clear_halt(serial->dev, port->read_urb->pipe); 518 519 buf = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL); 520 if (buf == NULL) { 521 dev_err(&port->dev, "%s(): out of memory!\n", __func__); 522 return -ENOMEM; 523 } 524 525 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 526 OTI6858_REQ_T_GET_STATUS, 527 OTI6858_REQ_GET_STATUS, 528 0, 0, 529 buf, OTI6858_CTRL_PKT_SIZE, 530 100); 531 if (result != OTI6858_CTRL_PKT_SIZE) { 532 /* assume default (after power-on reset) values */ 533 buf->divisor = cpu_to_le16(0x009c); /* 38400 bps */ 534 buf->frame_fmt = 0x03; /* 8N1 */ 535 buf->something = 0x43; 536 buf->control = 0x4c; /* DTR, RTS */ 537 buf->tx_status = 0x00; 538 buf->pin_state = 0x5b; /* RTS, CTS, DSR, DTR, RI, DCD */ 539 buf->rx_bytes_avail = 0x00; 540 } 541 542 spin_lock_irqsave(&priv->lock, flags); 543 memcpy(&priv->status, buf, OTI6858_CTRL_PKT_SIZE); 544 priv->pending_setup.divisor = buf->divisor; 545 priv->pending_setup.frame_fmt = buf->frame_fmt; 546 priv->pending_setup.control = buf->control; 547 spin_unlock_irqrestore(&priv->lock, flags); 548 kfree(buf); 549 550 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__); 551 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); 552 if (result != 0) { 553 dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n", 554 __func__, result); 555 oti6858_close(port); 556 return result; 557 } 558 559 /* setup termios */ 560 if (tty) 561 oti6858_set_termios(tty, port, NULL); 562 563 return 0; 564 } 565 566 static void oti6858_close(struct usb_serial_port *port) 567 { 568 struct oti6858_private *priv = usb_get_serial_port_data(port); 569 unsigned long flags; 570 571 spin_lock_irqsave(&port->lock, flags); 572 /* clear out any remaining data in the buffer */ 573 kfifo_reset_out(&port->write_fifo); 574 spin_unlock_irqrestore(&port->lock, flags); 575 576 dev_dbg(&port->dev, "%s(): after buf_clear()\n", __func__); 577 578 /* cancel scheduled setup */ 579 cancel_delayed_work_sync(&priv->delayed_setup_work); 580 cancel_delayed_work_sync(&priv->delayed_write_work); 581 582 /* shutdown our urbs */ 583 dev_dbg(&port->dev, "%s(): shutting down urbs\n", __func__); 584 usb_kill_urb(port->write_urb); 585 usb_kill_urb(port->read_urb); 586 usb_kill_urb(port->interrupt_in_urb); 587 } 588 589 static int oti6858_tiocmset(struct tty_struct *tty, 590 unsigned int set, unsigned int clear) 591 { 592 struct usb_serial_port *port = tty->driver_data; 593 struct oti6858_private *priv = usb_get_serial_port_data(port); 594 unsigned long flags; 595 u8 control; 596 597 dev_dbg(&port->dev, "%s(set = 0x%08x, clear = 0x%08x)\n", 598 __func__, set, clear); 599 600 /* FIXME: check if this is correct (active high/low) */ 601 spin_lock_irqsave(&priv->lock, flags); 602 control = priv->pending_setup.control; 603 if ((set & TIOCM_RTS) != 0) 604 control |= CONTROL_RTS_HIGH; 605 if ((set & TIOCM_DTR) != 0) 606 control |= CONTROL_DTR_HIGH; 607 if ((clear & TIOCM_RTS) != 0) 608 control &= ~CONTROL_RTS_HIGH; 609 if ((clear & TIOCM_DTR) != 0) 610 control &= ~CONTROL_DTR_HIGH; 611 612 if (control != priv->pending_setup.control) 613 priv->pending_setup.control = control; 614 615 spin_unlock_irqrestore(&priv->lock, flags); 616 return 0; 617 } 618 619 static int oti6858_tiocmget(struct tty_struct *tty) 620 { 621 struct usb_serial_port *port = tty->driver_data; 622 struct oti6858_private *priv = usb_get_serial_port_data(port); 623 unsigned long flags; 624 unsigned pin_state; 625 unsigned result = 0; 626 627 spin_lock_irqsave(&priv->lock, flags); 628 pin_state = priv->status.pin_state & PIN_MASK; 629 spin_unlock_irqrestore(&priv->lock, flags); 630 631 /* FIXME: check if this is correct (active high/low) */ 632 if ((pin_state & PIN_RTS) != 0) 633 result |= TIOCM_RTS; 634 if ((pin_state & PIN_CTS) != 0) 635 result |= TIOCM_CTS; 636 if ((pin_state & PIN_DSR) != 0) 637 result |= TIOCM_DSR; 638 if ((pin_state & PIN_DTR) != 0) 639 result |= TIOCM_DTR; 640 if ((pin_state & PIN_RI) != 0) 641 result |= TIOCM_RI; 642 if ((pin_state & PIN_DCD) != 0) 643 result |= TIOCM_CD; 644 645 dev_dbg(&port->dev, "%s() = 0x%08x\n", __func__, result); 646 647 return result; 648 } 649 650 static int oti6858_tiocmiwait(struct tty_struct *tty, unsigned long arg) 651 { 652 struct usb_serial_port *port = tty->driver_data; 653 struct oti6858_private *priv = usb_get_serial_port_data(port); 654 unsigned long flags; 655 unsigned int prev, status; 656 unsigned int changed; 657 658 spin_lock_irqsave(&priv->lock, flags); 659 prev = priv->status.pin_state; 660 spin_unlock_irqrestore(&priv->lock, flags); 661 662 while (1) { 663 wait_event_interruptible(port->port.delta_msr_wait, 664 port->serial->disconnected || 665 priv->status.pin_state != prev); 666 if (signal_pending(current)) 667 return -ERESTARTSYS; 668 669 if (port->serial->disconnected) 670 return -EIO; 671 672 spin_lock_irqsave(&priv->lock, flags); 673 status = priv->status.pin_state & PIN_MASK; 674 spin_unlock_irqrestore(&priv->lock, flags); 675 676 changed = prev ^ status; 677 /* FIXME: check if this is correct (active high/low) */ 678 if (((arg & TIOCM_RNG) && (changed & PIN_RI)) || 679 ((arg & TIOCM_DSR) && (changed & PIN_DSR)) || 680 ((arg & TIOCM_CD) && (changed & PIN_DCD)) || 681 ((arg & TIOCM_CTS) && (changed & PIN_CTS))) 682 return 0; 683 prev = status; 684 } 685 686 /* NOTREACHED */ 687 return 0; 688 } 689 690 static void oti6858_read_int_callback(struct urb *urb) 691 { 692 struct usb_serial_port *port = urb->context; 693 struct oti6858_private *priv = usb_get_serial_port_data(port); 694 int transient = 0, can_recv = 0, resubmit = 1; 695 int status = urb->status; 696 697 switch (status) { 698 case 0: 699 /* success */ 700 break; 701 case -ECONNRESET: 702 case -ENOENT: 703 case -ESHUTDOWN: 704 /* this urb is terminated, clean up */ 705 dev_dbg(&urb->dev->dev, "%s(): urb shutting down with status: %d\n", 706 __func__, status); 707 return; 708 default: 709 dev_dbg(&urb->dev->dev, "%s(): nonzero urb status received: %d\n", 710 __func__, status); 711 break; 712 } 713 714 if (status == 0 && urb->actual_length == OTI6858_CTRL_PKT_SIZE) { 715 struct oti6858_control_pkt *xs = urb->transfer_buffer; 716 unsigned long flags; 717 718 spin_lock_irqsave(&priv->lock, flags); 719 720 if (!priv->transient) { 721 if (!OTI6858_CTRL_EQUALS_PENDING(xs, priv)) { 722 if (xs->rx_bytes_avail == 0) { 723 priv->transient = 4; 724 priv->setup_done = 0; 725 resubmit = 0; 726 dev_dbg(&port->dev, "%s(): scheduling setup_line()\n", __func__); 727 schedule_delayed_work(&priv->delayed_setup_work, 0); 728 } 729 } 730 } else { 731 if (OTI6858_CTRL_EQUALS_PENDING(xs, priv)) { 732 priv->transient = 0; 733 } else if (!priv->setup_done) { 734 resubmit = 0; 735 } else if (--priv->transient == 0) { 736 if (xs->rx_bytes_avail == 0) { 737 priv->transient = 4; 738 priv->setup_done = 0; 739 resubmit = 0; 740 dev_dbg(&port->dev, "%s(): scheduling setup_line()\n", __func__); 741 schedule_delayed_work(&priv->delayed_setup_work, 0); 742 } 743 } 744 } 745 746 if (!priv->transient) { 747 if (xs->pin_state != priv->status.pin_state) 748 wake_up_interruptible(&port->port.delta_msr_wait); 749 memcpy(&priv->status, xs, OTI6858_CTRL_PKT_SIZE); 750 } 751 752 if (!priv->transient && xs->rx_bytes_avail != 0) { 753 can_recv = xs->rx_bytes_avail; 754 priv->flags.read_urb_in_use = 1; 755 } 756 757 transient = priv->transient; 758 spin_unlock_irqrestore(&priv->lock, flags); 759 } 760 761 if (can_recv) { 762 int result; 763 764 result = usb_submit_urb(port->read_urb, GFP_ATOMIC); 765 if (result != 0) { 766 priv->flags.read_urb_in_use = 0; 767 dev_err(&port->dev, "%s(): usb_submit_urb() failed," 768 " error %d\n", __func__, result); 769 } else { 770 resubmit = 0; 771 } 772 } else if (!transient) { 773 unsigned long flags; 774 int count; 775 776 spin_lock_irqsave(&port->lock, flags); 777 count = kfifo_len(&port->write_fifo); 778 spin_unlock_irqrestore(&port->lock, flags); 779 780 spin_lock_irqsave(&priv->lock, flags); 781 if (priv->flags.write_urb_in_use == 0 && count != 0) { 782 schedule_delayed_work(&priv->delayed_write_work, 0); 783 resubmit = 0; 784 } 785 spin_unlock_irqrestore(&priv->lock, flags); 786 } 787 788 if (resubmit) { 789 int result; 790 791 /* dev_dbg(&urb->dev->dev, "%s(): submitting interrupt urb\n", __func__); */ 792 result = usb_submit_urb(urb, GFP_ATOMIC); 793 if (result != 0) { 794 dev_err(&urb->dev->dev, 795 "%s(): usb_submit_urb() failed with" 796 " error %d\n", __func__, result); 797 } 798 } 799 } 800 801 static void oti6858_read_bulk_callback(struct urb *urb) 802 { 803 struct usb_serial_port *port = urb->context; 804 struct oti6858_private *priv = usb_get_serial_port_data(port); 805 unsigned char *data = urb->transfer_buffer; 806 unsigned long flags; 807 int status = urb->status; 808 int result; 809 810 spin_lock_irqsave(&priv->lock, flags); 811 priv->flags.read_urb_in_use = 0; 812 spin_unlock_irqrestore(&priv->lock, flags); 813 814 if (status != 0) { 815 dev_dbg(&urb->dev->dev, "%s(): unable to handle the error, exiting\n", __func__); 816 return; 817 } 818 819 if (urb->actual_length > 0) { 820 tty_insert_flip_string(&port->port, data, urb->actual_length); 821 tty_flip_buffer_push(&port->port); 822 } 823 824 /* schedule the interrupt urb */ 825 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC); 826 if (result != 0 && result != -EPERM) { 827 dev_err(&port->dev, "%s(): usb_submit_urb() failed," 828 " error %d\n", __func__, result); 829 } 830 } 831 832 static void oti6858_write_bulk_callback(struct urb *urb) 833 { 834 struct usb_serial_port *port = urb->context; 835 struct oti6858_private *priv = usb_get_serial_port_data(port); 836 int status = urb->status; 837 int result; 838 839 switch (status) { 840 case 0: 841 /* success */ 842 break; 843 case -ECONNRESET: 844 case -ENOENT: 845 case -ESHUTDOWN: 846 /* this urb is terminated, clean up */ 847 dev_dbg(&urb->dev->dev, "%s(): urb shutting down with status: %d\n", __func__, status); 848 priv->flags.write_urb_in_use = 0; 849 return; 850 default: 851 /* error in the urb, so we have to resubmit it */ 852 dev_dbg(&urb->dev->dev, "%s(): nonzero write bulk status received: %d\n", __func__, status); 853 dev_dbg(&urb->dev->dev, "%s(): overflow in write\n", __func__); 854 855 port->write_urb->transfer_buffer_length = 1; 856 result = usb_submit_urb(port->write_urb, GFP_ATOMIC); 857 if (result) { 858 dev_err_console(port, "%s(): usb_submit_urb() failed," 859 " error %d\n", __func__, result); 860 } else { 861 return; 862 } 863 } 864 865 priv->flags.write_urb_in_use = 0; 866 867 /* schedule the interrupt urb if we are still open */ 868 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__); 869 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC); 870 if (result != 0) { 871 dev_err(&port->dev, "%s(): failed submitting int urb," 872 " error %d\n", __func__, result); 873 } 874 } 875 876 module_usb_serial_driver(serial_drivers, id_table); 877 878 MODULE_DESCRIPTION(OTI6858_DESCRIPTION); 879 MODULE_AUTHOR(OTI6858_AUTHOR); 880 MODULE_LICENSE("GPL"); 881