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 #define OTI6858_VERSION "0.2" 61 62 static const struct usb_device_id id_table[] = { 63 { USB_DEVICE(OTI6858_VENDOR_ID, OTI6858_PRODUCT_ID) }, 64 { } 65 }; 66 67 MODULE_DEVICE_TABLE(usb, id_table); 68 69 static struct usb_driver oti6858_driver = { 70 .name = "oti6858", 71 .id_table = id_table, 72 }; 73 74 static bool debug; 75 76 /* requests */ 77 #define OTI6858_REQ_GET_STATUS (USB_DIR_IN | USB_TYPE_VENDOR | 0x00) 78 #define OTI6858_REQ_T_GET_STATUS 0x01 79 80 #define OTI6858_REQ_SET_LINE (USB_DIR_OUT | USB_TYPE_VENDOR | 0x00) 81 #define OTI6858_REQ_T_SET_LINE 0x00 82 83 #define OTI6858_REQ_CHECK_TXBUFF (USB_DIR_IN | USB_TYPE_VENDOR | 0x01) 84 #define OTI6858_REQ_T_CHECK_TXBUFF 0x00 85 86 /* format of the control packet */ 87 struct oti6858_control_pkt { 88 __le16 divisor; /* baud rate = 96000000 / (16 * divisor), LE */ 89 #define OTI6858_MAX_BAUD_RATE 3000000 90 u8 frame_fmt; 91 #define FMT_STOP_BITS_MASK 0xc0 92 #define FMT_STOP_BITS_1 0x00 93 #define FMT_STOP_BITS_2 0x40 /* 1.5 stop bits if FMT_DATA_BITS_5 */ 94 #define FMT_PARITY_MASK 0x38 95 #define FMT_PARITY_NONE 0x00 96 #define FMT_PARITY_ODD 0x08 97 #define FMT_PARITY_EVEN 0x18 98 #define FMT_PARITY_MARK 0x28 99 #define FMT_PARITY_SPACE 0x38 100 #define FMT_DATA_BITS_MASK 0x03 101 #define FMT_DATA_BITS_5 0x00 102 #define FMT_DATA_BITS_6 0x01 103 #define FMT_DATA_BITS_7 0x02 104 #define FMT_DATA_BITS_8 0x03 105 u8 something; /* always equals 0x43 */ 106 u8 control; /* settings of flow control lines */ 107 #define CONTROL_MASK 0x0c 108 #define CONTROL_DTR_HIGH 0x08 109 #define CONTROL_RTS_HIGH 0x04 110 u8 tx_status; 111 #define TX_BUFFER_EMPTIED 0x09 112 u8 pin_state; 113 #define PIN_MASK 0x3f 114 #define PIN_RTS 0x20 /* output pin */ 115 #define PIN_CTS 0x10 /* input pin, active low */ 116 #define PIN_DSR 0x08 /* input pin, active low */ 117 #define PIN_DTR 0x04 /* output pin */ 118 #define PIN_RI 0x02 /* input pin, active low */ 119 #define PIN_DCD 0x01 /* input pin, active low */ 120 u8 rx_bytes_avail; /* number of bytes in rx buffer */; 121 }; 122 123 #define OTI6858_CTRL_PKT_SIZE sizeof(struct oti6858_control_pkt) 124 #define OTI6858_CTRL_EQUALS_PENDING(a, priv) \ 125 (((a)->divisor == (priv)->pending_setup.divisor) \ 126 && ((a)->control == (priv)->pending_setup.control) \ 127 && ((a)->frame_fmt == (priv)->pending_setup.frame_fmt)) 128 129 /* function prototypes */ 130 static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port); 131 static void oti6858_close(struct usb_serial_port *port); 132 static void oti6858_set_termios(struct tty_struct *tty, 133 struct usb_serial_port *port, struct ktermios *old); 134 static void oti6858_init_termios(struct tty_struct *tty); 135 static int oti6858_ioctl(struct tty_struct *tty, 136 unsigned int cmd, unsigned long arg); 137 static void oti6858_read_int_callback(struct urb *urb); 138 static void oti6858_read_bulk_callback(struct urb *urb); 139 static void oti6858_write_bulk_callback(struct urb *urb); 140 static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port, 141 const unsigned char *buf, int count); 142 static int oti6858_write_room(struct tty_struct *tty); 143 static int oti6858_chars_in_buffer(struct tty_struct *tty); 144 static int oti6858_tiocmget(struct tty_struct *tty); 145 static int oti6858_tiocmset(struct tty_struct *tty, 146 unsigned int set, unsigned int clear); 147 static int oti6858_startup(struct usb_serial *serial); 148 static void oti6858_release(struct usb_serial *serial); 149 150 /* device info */ 151 static struct usb_serial_driver oti6858_device = { 152 .driver = { 153 .owner = THIS_MODULE, 154 .name = "oti6858", 155 }, 156 .id_table = id_table, 157 .num_ports = 1, 158 .open = oti6858_open, 159 .close = oti6858_close, 160 .write = oti6858_write, 161 .ioctl = oti6858_ioctl, 162 .set_termios = oti6858_set_termios, 163 .init_termios = oti6858_init_termios, 164 .tiocmget = oti6858_tiocmget, 165 .tiocmset = oti6858_tiocmset, 166 .read_bulk_callback = oti6858_read_bulk_callback, 167 .read_int_callback = oti6858_read_int_callback, 168 .write_bulk_callback = oti6858_write_bulk_callback, 169 .write_room = oti6858_write_room, 170 .chars_in_buffer = oti6858_chars_in_buffer, 171 .attach = oti6858_startup, 172 .release = oti6858_release, 173 }; 174 175 static struct usb_serial_driver * const serial_drivers[] = { 176 &oti6858_device, NULL 177 }; 178 179 struct oti6858_private { 180 spinlock_t lock; 181 182 struct oti6858_control_pkt status; 183 184 struct { 185 u8 read_urb_in_use; 186 u8 write_urb_in_use; 187 } flags; 188 struct delayed_work delayed_write_work; 189 190 struct { 191 __le16 divisor; 192 u8 frame_fmt; 193 u8 control; 194 } pending_setup; 195 u8 transient; 196 u8 setup_done; 197 struct delayed_work delayed_setup_work; 198 199 wait_queue_head_t intr_wait; 200 struct usb_serial_port *port; /* USB port with which associated */ 201 }; 202 203 static void setup_line(struct work_struct *work) 204 { 205 struct oti6858_private *priv = container_of(work, 206 struct oti6858_private, delayed_setup_work.work); 207 struct usb_serial_port *port = priv->port; 208 struct oti6858_control_pkt *new_setup; 209 unsigned long flags; 210 int result; 211 212 new_setup = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL); 213 if (new_setup == NULL) { 214 dev_err(&port->dev, "%s(): out of memory!\n", __func__); 215 /* we will try again */ 216 schedule_delayed_work(&priv->delayed_setup_work, 217 msecs_to_jiffies(2)); 218 return; 219 } 220 221 result = usb_control_msg(port->serial->dev, 222 usb_rcvctrlpipe(port->serial->dev, 0), 223 OTI6858_REQ_T_GET_STATUS, 224 OTI6858_REQ_GET_STATUS, 225 0, 0, 226 new_setup, OTI6858_CTRL_PKT_SIZE, 227 100); 228 229 if (result != OTI6858_CTRL_PKT_SIZE) { 230 dev_err(&port->dev, "%s(): error reading status\n", __func__); 231 kfree(new_setup); 232 /* we will try again */ 233 schedule_delayed_work(&priv->delayed_setup_work, 234 msecs_to_jiffies(2)); 235 return; 236 } 237 238 spin_lock_irqsave(&priv->lock, flags); 239 if (!OTI6858_CTRL_EQUALS_PENDING(new_setup, priv)) { 240 new_setup->divisor = priv->pending_setup.divisor; 241 new_setup->control = priv->pending_setup.control; 242 new_setup->frame_fmt = priv->pending_setup.frame_fmt; 243 244 spin_unlock_irqrestore(&priv->lock, flags); 245 result = usb_control_msg(port->serial->dev, 246 usb_sndctrlpipe(port->serial->dev, 0), 247 OTI6858_REQ_T_SET_LINE, 248 OTI6858_REQ_SET_LINE, 249 0, 0, 250 new_setup, OTI6858_CTRL_PKT_SIZE, 251 100); 252 } else { 253 spin_unlock_irqrestore(&priv->lock, flags); 254 result = 0; 255 } 256 kfree(new_setup); 257 258 spin_lock_irqsave(&priv->lock, flags); 259 if (result != OTI6858_CTRL_PKT_SIZE) 260 priv->transient = 0; 261 priv->setup_done = 1; 262 spin_unlock_irqrestore(&priv->lock, flags); 263 264 dbg("%s(): submitting interrupt urb", __func__); 265 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); 266 if (result != 0) { 267 dev_err(&port->dev, "%s(): usb_submit_urb() failed" 268 " with error %d\n", __func__, result); 269 } 270 } 271 272 static void send_data(struct work_struct *work) 273 { 274 struct oti6858_private *priv = container_of(work, 275 struct oti6858_private, delayed_write_work.work); 276 struct usb_serial_port *port = priv->port; 277 int count = 0, result; 278 unsigned long flags; 279 u8 *allow; 280 281 spin_lock_irqsave(&priv->lock, flags); 282 if (priv->flags.write_urb_in_use) { 283 spin_unlock_irqrestore(&priv->lock, flags); 284 schedule_delayed_work(&priv->delayed_write_work, 285 msecs_to_jiffies(2)); 286 return; 287 } 288 priv->flags.write_urb_in_use = 1; 289 spin_unlock_irqrestore(&priv->lock, flags); 290 291 spin_lock_irqsave(&port->lock, flags); 292 count = kfifo_len(&port->write_fifo); 293 spin_unlock_irqrestore(&port->lock, flags); 294 295 if (count > port->bulk_out_size) 296 count = port->bulk_out_size; 297 298 if (count != 0) { 299 allow = kmalloc(1, GFP_KERNEL); 300 if (!allow) { 301 dev_err_console(port, "%s(): kmalloc failed\n", 302 __func__); 303 return; 304 } 305 result = usb_control_msg(port->serial->dev, 306 usb_rcvctrlpipe(port->serial->dev, 0), 307 OTI6858_REQ_T_CHECK_TXBUFF, 308 OTI6858_REQ_CHECK_TXBUFF, 309 count, 0, allow, 1, 100); 310 if (result != 1 || *allow != 0) 311 count = 0; 312 kfree(allow); 313 } 314 315 if (count == 0) { 316 priv->flags.write_urb_in_use = 0; 317 318 dbg("%s(): submitting interrupt urb", __func__); 319 result = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO); 320 if (result != 0) { 321 dev_err(&port->dev, "%s(): usb_submit_urb() failed" 322 " with error %d\n", __func__, result); 323 } 324 return; 325 } 326 327 count = kfifo_out_locked(&port->write_fifo, 328 port->write_urb->transfer_buffer, 329 count, &port->lock); 330 port->write_urb->transfer_buffer_length = count; 331 result = usb_submit_urb(port->write_urb, GFP_NOIO); 332 if (result != 0) { 333 dev_err_console(port, "%s(): usb_submit_urb() failed" 334 " with error %d\n", __func__, result); 335 priv->flags.write_urb_in_use = 0; 336 } 337 338 usb_serial_port_softint(port); 339 } 340 341 static int oti6858_startup(struct usb_serial *serial) 342 { 343 struct usb_serial_port *port = serial->port[0]; 344 struct oti6858_private *priv; 345 int i; 346 347 for (i = 0; i < serial->num_ports; ++i) { 348 priv = kzalloc(sizeof(struct oti6858_private), GFP_KERNEL); 349 if (!priv) 350 break; 351 352 spin_lock_init(&priv->lock); 353 init_waitqueue_head(&priv->intr_wait); 354 /* INIT_WORK(&priv->setup_work, setup_line, serial->port[i]); */ 355 /* INIT_WORK(&priv->write_work, send_data, serial->port[i]); */ 356 priv->port = port; 357 INIT_DELAYED_WORK(&priv->delayed_setup_work, setup_line); 358 INIT_DELAYED_WORK(&priv->delayed_write_work, send_data); 359 360 usb_set_serial_port_data(serial->port[i], priv); 361 } 362 if (i == serial->num_ports) 363 return 0; 364 365 for (--i; i >= 0; --i) { 366 priv = usb_get_serial_port_data(serial->port[i]); 367 kfree(priv); 368 usb_set_serial_port_data(serial->port[i], NULL); 369 } 370 return -ENOMEM; 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 if (!tty) { 429 dbg("%s(): no tty structures", __func__); 430 return; 431 } 432 433 cflag = tty->termios->c_cflag; 434 435 spin_lock_irqsave(&priv->lock, flags); 436 divisor = priv->pending_setup.divisor; 437 frame_fmt = priv->pending_setup.frame_fmt; 438 control = priv->pending_setup.control; 439 spin_unlock_irqrestore(&priv->lock, flags); 440 441 frame_fmt &= ~FMT_DATA_BITS_MASK; 442 switch (cflag & CSIZE) { 443 case CS5: 444 frame_fmt |= FMT_DATA_BITS_5; 445 break; 446 case CS6: 447 frame_fmt |= FMT_DATA_BITS_6; 448 break; 449 case CS7: 450 frame_fmt |= FMT_DATA_BITS_7; 451 break; 452 default: 453 case CS8: 454 frame_fmt |= FMT_DATA_BITS_8; 455 break; 456 } 457 458 /* manufacturer claims that this device can work with baud rates 459 * up to 3 Mbps; I've tested it only on 115200 bps, so I can't 460 * guarantee that any other baud rate will work (especially 461 * the higher ones) 462 */ 463 br = tty_get_baud_rate(tty); 464 if (br == 0) { 465 divisor = 0; 466 } else { 467 int real_br; 468 int new_divisor; 469 br = min(br, OTI6858_MAX_BAUD_RATE); 470 471 new_divisor = (96000000 + 8 * br) / (16 * br); 472 real_br = 96000000 / (16 * new_divisor); 473 divisor = cpu_to_le16(new_divisor); 474 tty_encode_baud_rate(tty, real_br, real_br); 475 } 476 477 frame_fmt &= ~FMT_STOP_BITS_MASK; 478 if ((cflag & CSTOPB) != 0) 479 frame_fmt |= FMT_STOP_BITS_2; 480 else 481 frame_fmt |= FMT_STOP_BITS_1; 482 483 frame_fmt &= ~FMT_PARITY_MASK; 484 if ((cflag & PARENB) != 0) { 485 if ((cflag & PARODD) != 0) 486 frame_fmt |= FMT_PARITY_ODD; 487 else 488 frame_fmt |= FMT_PARITY_EVEN; 489 } else { 490 frame_fmt |= FMT_PARITY_NONE; 491 } 492 493 control &= ~CONTROL_MASK; 494 if ((cflag & CRTSCTS) != 0) 495 control |= (CONTROL_DTR_HIGH | CONTROL_RTS_HIGH); 496 497 /* change control lines if we are switching to or from B0 */ 498 /* FIXME: 499 spin_lock_irqsave(&priv->lock, flags); 500 control = priv->line_control; 501 if ((cflag & CBAUD) == B0) 502 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS); 503 else 504 priv->line_control |= (CONTROL_DTR | CONTROL_RTS); 505 if (control != priv->line_control) { 506 control = priv->line_control; 507 spin_unlock_irqrestore(&priv->lock, flags); 508 set_control_lines(serial->dev, control); 509 } else { 510 spin_unlock_irqrestore(&priv->lock, flags); 511 } 512 */ 513 514 spin_lock_irqsave(&priv->lock, flags); 515 if (divisor != priv->pending_setup.divisor 516 || control != priv->pending_setup.control 517 || frame_fmt != priv->pending_setup.frame_fmt) { 518 priv->pending_setup.divisor = divisor; 519 priv->pending_setup.control = control; 520 priv->pending_setup.frame_fmt = frame_fmt; 521 } 522 spin_unlock_irqrestore(&priv->lock, flags); 523 } 524 525 static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port) 526 { 527 struct oti6858_private *priv = usb_get_serial_port_data(port); 528 struct ktermios tmp_termios; 529 struct usb_serial *serial = port->serial; 530 struct oti6858_control_pkt *buf; 531 unsigned long flags; 532 int result; 533 534 usb_clear_halt(serial->dev, port->write_urb->pipe); 535 usb_clear_halt(serial->dev, port->read_urb->pipe); 536 537 buf = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL); 538 if (buf == NULL) { 539 dev_err(&port->dev, "%s(): out of memory!\n", __func__); 540 return -ENOMEM; 541 } 542 543 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 544 OTI6858_REQ_T_GET_STATUS, 545 OTI6858_REQ_GET_STATUS, 546 0, 0, 547 buf, OTI6858_CTRL_PKT_SIZE, 548 100); 549 if (result != OTI6858_CTRL_PKT_SIZE) { 550 /* assume default (after power-on reset) values */ 551 buf->divisor = cpu_to_le16(0x009c); /* 38400 bps */ 552 buf->frame_fmt = 0x03; /* 8N1 */ 553 buf->something = 0x43; 554 buf->control = 0x4c; /* DTR, RTS */ 555 buf->tx_status = 0x00; 556 buf->pin_state = 0x5b; /* RTS, CTS, DSR, DTR, RI, DCD */ 557 buf->rx_bytes_avail = 0x00; 558 } 559 560 spin_lock_irqsave(&priv->lock, flags); 561 memcpy(&priv->status, buf, OTI6858_CTRL_PKT_SIZE); 562 priv->pending_setup.divisor = buf->divisor; 563 priv->pending_setup.frame_fmt = buf->frame_fmt; 564 priv->pending_setup.control = buf->control; 565 spin_unlock_irqrestore(&priv->lock, flags); 566 kfree(buf); 567 568 dbg("%s(): submitting interrupt urb", __func__); 569 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); 570 if (result != 0) { 571 dev_err(&port->dev, "%s(): usb_submit_urb() failed" 572 " with error %d\n", __func__, result); 573 oti6858_close(port); 574 return result; 575 } 576 577 /* setup termios */ 578 if (tty) 579 oti6858_set_termios(tty, port, &tmp_termios); 580 port->port.drain_delay = 256; /* FIXME: check the FIFO length */ 581 return 0; 582 } 583 584 static void oti6858_close(struct usb_serial_port *port) 585 { 586 struct oti6858_private *priv = usb_get_serial_port_data(port); 587 unsigned long flags; 588 589 spin_lock_irqsave(&port->lock, flags); 590 /* clear out any remaining data in the buffer */ 591 kfifo_reset_out(&port->write_fifo); 592 spin_unlock_irqrestore(&port->lock, flags); 593 594 dbg("%s(): after buf_clear()", __func__); 595 596 /* cancel scheduled setup */ 597 cancel_delayed_work_sync(&priv->delayed_setup_work); 598 cancel_delayed_work_sync(&priv->delayed_write_work); 599 600 /* shutdown our urbs */ 601 dbg("%s(): shutting down urbs", __func__); 602 usb_kill_urb(port->write_urb); 603 usb_kill_urb(port->read_urb); 604 usb_kill_urb(port->interrupt_in_urb); 605 } 606 607 static int oti6858_tiocmset(struct tty_struct *tty, 608 unsigned int set, unsigned int clear) 609 { 610 struct usb_serial_port *port = tty->driver_data; 611 struct oti6858_private *priv = usb_get_serial_port_data(port); 612 unsigned long flags; 613 u8 control; 614 615 dbg("%s(port = %d, set = 0x%08x, clear = 0x%08x)", 616 __func__, port->number, set, clear); 617 618 /* FIXME: check if this is correct (active high/low) */ 619 spin_lock_irqsave(&priv->lock, flags); 620 control = priv->pending_setup.control; 621 if ((set & TIOCM_RTS) != 0) 622 control |= CONTROL_RTS_HIGH; 623 if ((set & TIOCM_DTR) != 0) 624 control |= CONTROL_DTR_HIGH; 625 if ((clear & TIOCM_RTS) != 0) 626 control &= ~CONTROL_RTS_HIGH; 627 if ((clear & TIOCM_DTR) != 0) 628 control &= ~CONTROL_DTR_HIGH; 629 630 if (control != priv->pending_setup.control) 631 priv->pending_setup.control = control; 632 633 spin_unlock_irqrestore(&priv->lock, flags); 634 return 0; 635 } 636 637 static int oti6858_tiocmget(struct tty_struct *tty) 638 { 639 struct usb_serial_port *port = tty->driver_data; 640 struct oti6858_private *priv = usb_get_serial_port_data(port); 641 unsigned long flags; 642 unsigned pin_state; 643 unsigned result = 0; 644 645 spin_lock_irqsave(&priv->lock, flags); 646 pin_state = priv->status.pin_state & PIN_MASK; 647 spin_unlock_irqrestore(&priv->lock, flags); 648 649 /* FIXME: check if this is correct (active high/low) */ 650 if ((pin_state & PIN_RTS) != 0) 651 result |= TIOCM_RTS; 652 if ((pin_state & PIN_CTS) != 0) 653 result |= TIOCM_CTS; 654 if ((pin_state & PIN_DSR) != 0) 655 result |= TIOCM_DSR; 656 if ((pin_state & PIN_DTR) != 0) 657 result |= TIOCM_DTR; 658 if ((pin_state & PIN_RI) != 0) 659 result |= TIOCM_RI; 660 if ((pin_state & PIN_DCD) != 0) 661 result |= TIOCM_CD; 662 663 dbg("%s() = 0x%08x", __func__, result); 664 665 return result; 666 } 667 668 static int wait_modem_info(struct usb_serial_port *port, unsigned int arg) 669 { 670 struct oti6858_private *priv = usb_get_serial_port_data(port); 671 unsigned long flags; 672 unsigned int prev, status; 673 unsigned int changed; 674 675 spin_lock_irqsave(&priv->lock, flags); 676 prev = priv->status.pin_state; 677 spin_unlock_irqrestore(&priv->lock, flags); 678 679 while (1) { 680 wait_event_interruptible(priv->intr_wait, 681 priv->status.pin_state != prev); 682 if (signal_pending(current)) 683 return -ERESTARTSYS; 684 685 spin_lock_irqsave(&priv->lock, flags); 686 status = priv->status.pin_state & PIN_MASK; 687 spin_unlock_irqrestore(&priv->lock, flags); 688 689 changed = prev ^ status; 690 /* FIXME: check if this is correct (active high/low) */ 691 if (((arg & TIOCM_RNG) && (changed & PIN_RI)) || 692 ((arg & TIOCM_DSR) && (changed & PIN_DSR)) || 693 ((arg & TIOCM_CD) && (changed & PIN_DCD)) || 694 ((arg & TIOCM_CTS) && (changed & PIN_CTS))) 695 return 0; 696 prev = status; 697 } 698 699 /* NOTREACHED */ 700 return 0; 701 } 702 703 static int oti6858_ioctl(struct tty_struct *tty, 704 unsigned int cmd, unsigned long arg) 705 { 706 struct usb_serial_port *port = tty->driver_data; 707 708 dbg("%s(port = %d, cmd = 0x%04x, arg = 0x%08lx)", 709 __func__, port->number, cmd, arg); 710 711 switch (cmd) { 712 case TIOCMIWAIT: 713 dbg("%s(): TIOCMIWAIT", __func__); 714 return wait_modem_info(port, arg); 715 default: 716 dbg("%s(): 0x%04x not supported", __func__, cmd); 717 break; 718 } 719 return -ENOIOCTLCMD; 720 } 721 722 723 static void oti6858_release(struct usb_serial *serial) 724 { 725 int i; 726 727 for (i = 0; i < serial->num_ports; ++i) 728 kfree(usb_get_serial_port_data(serial->port[i])); 729 } 730 731 static void oti6858_read_int_callback(struct urb *urb) 732 { 733 struct usb_serial_port *port = urb->context; 734 struct oti6858_private *priv = usb_get_serial_port_data(port); 735 int transient = 0, can_recv = 0, resubmit = 1; 736 int status = urb->status; 737 738 switch (status) { 739 case 0: 740 /* success */ 741 break; 742 case -ECONNRESET: 743 case -ENOENT: 744 case -ESHUTDOWN: 745 /* this urb is terminated, clean up */ 746 dbg("%s(): urb shutting down with status: %d", 747 __func__, status); 748 return; 749 default: 750 dbg("%s(): nonzero urb status received: %d", 751 __func__, status); 752 break; 753 } 754 755 if (status == 0 && urb->actual_length == OTI6858_CTRL_PKT_SIZE) { 756 struct oti6858_control_pkt *xs = urb->transfer_buffer; 757 unsigned long flags; 758 759 spin_lock_irqsave(&priv->lock, flags); 760 761 if (!priv->transient) { 762 if (!OTI6858_CTRL_EQUALS_PENDING(xs, priv)) { 763 if (xs->rx_bytes_avail == 0) { 764 priv->transient = 4; 765 priv->setup_done = 0; 766 resubmit = 0; 767 dbg("%s(): scheduling setup_line()", 768 __func__); 769 schedule_delayed_work(&priv->delayed_setup_work, 0); 770 } 771 } 772 } else { 773 if (OTI6858_CTRL_EQUALS_PENDING(xs, priv)) { 774 priv->transient = 0; 775 } else if (!priv->setup_done) { 776 resubmit = 0; 777 } else if (--priv->transient == 0) { 778 if (xs->rx_bytes_avail == 0) { 779 priv->transient = 4; 780 priv->setup_done = 0; 781 resubmit = 0; 782 dbg("%s(): scheduling setup_line()", 783 __func__); 784 schedule_delayed_work(&priv->delayed_setup_work, 0); 785 } 786 } 787 } 788 789 if (!priv->transient) { 790 if (xs->pin_state != priv->status.pin_state) 791 wake_up_interruptible(&priv->intr_wait); 792 memcpy(&priv->status, xs, OTI6858_CTRL_PKT_SIZE); 793 } 794 795 if (!priv->transient && xs->rx_bytes_avail != 0) { 796 can_recv = xs->rx_bytes_avail; 797 priv->flags.read_urb_in_use = 1; 798 } 799 800 transient = priv->transient; 801 spin_unlock_irqrestore(&priv->lock, flags); 802 } 803 804 if (can_recv) { 805 int result; 806 807 result = usb_submit_urb(port->read_urb, GFP_ATOMIC); 808 if (result != 0) { 809 priv->flags.read_urb_in_use = 0; 810 dev_err(&port->dev, "%s(): usb_submit_urb() failed," 811 " error %d\n", __func__, result); 812 } else { 813 resubmit = 0; 814 } 815 } else if (!transient) { 816 unsigned long flags; 817 int count; 818 819 spin_lock_irqsave(&port->lock, flags); 820 count = kfifo_len(&port->write_fifo); 821 spin_unlock_irqrestore(&port->lock, flags); 822 823 spin_lock_irqsave(&priv->lock, flags); 824 if (priv->flags.write_urb_in_use == 0 && count != 0) { 825 schedule_delayed_work(&priv->delayed_write_work, 0); 826 resubmit = 0; 827 } 828 spin_unlock_irqrestore(&priv->lock, flags); 829 } 830 831 if (resubmit) { 832 int result; 833 834 /* dbg("%s(): submitting interrupt urb", __func__); */ 835 result = usb_submit_urb(urb, GFP_ATOMIC); 836 if (result != 0) { 837 dev_err(&urb->dev->dev, 838 "%s(): usb_submit_urb() failed with" 839 " error %d\n", __func__, result); 840 } 841 } 842 } 843 844 static void oti6858_read_bulk_callback(struct urb *urb) 845 { 846 struct usb_serial_port *port = urb->context; 847 struct oti6858_private *priv = usb_get_serial_port_data(port); 848 struct tty_struct *tty; 849 unsigned char *data = urb->transfer_buffer; 850 unsigned long flags; 851 int status = urb->status; 852 int result; 853 854 spin_lock_irqsave(&priv->lock, flags); 855 priv->flags.read_urb_in_use = 0; 856 spin_unlock_irqrestore(&priv->lock, flags); 857 858 if (status != 0) { 859 dbg("%s(): unable to handle the error, exiting", __func__); 860 return; 861 } 862 863 tty = tty_port_tty_get(&port->port); 864 if (tty != NULL && urb->actual_length > 0) { 865 tty_insert_flip_string(tty, data, urb->actual_length); 866 tty_flip_buffer_push(tty); 867 } 868 tty_kref_put(tty); 869 870 /* schedule the interrupt urb */ 871 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC); 872 if (result != 0 && result != -EPERM) { 873 dev_err(&port->dev, "%s(): usb_submit_urb() failed," 874 " error %d\n", __func__, result); 875 } 876 } 877 878 static void oti6858_write_bulk_callback(struct urb *urb) 879 { 880 struct usb_serial_port *port = urb->context; 881 struct oti6858_private *priv = usb_get_serial_port_data(port); 882 int status = urb->status; 883 int result; 884 885 switch (status) { 886 case 0: 887 /* success */ 888 break; 889 case -ECONNRESET: 890 case -ENOENT: 891 case -ESHUTDOWN: 892 /* this urb is terminated, clean up */ 893 dbg("%s(): urb shutting down with status: %d", 894 __func__, status); 895 priv->flags.write_urb_in_use = 0; 896 return; 897 default: 898 /* error in the urb, so we have to resubmit it */ 899 dbg("%s(): nonzero write bulk status received: %d", 900 __func__, status); 901 dbg("%s(): overflow in write", __func__); 902 903 port->write_urb->transfer_buffer_length = 1; 904 result = usb_submit_urb(port->write_urb, GFP_ATOMIC); 905 if (result) { 906 dev_err_console(port, "%s(): usb_submit_urb() failed," 907 " error %d\n", __func__, result); 908 } else { 909 return; 910 } 911 } 912 913 priv->flags.write_urb_in_use = 0; 914 915 /* schedule the interrupt urb if we are still open */ 916 dbg("%s(): submitting interrupt urb", __func__); 917 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC); 918 if (result != 0) { 919 dev_err(&port->dev, "%s(): failed submitting int urb," 920 " error %d\n", __func__, result); 921 } 922 } 923 924 module_usb_serial_driver(oti6858_driver, serial_drivers); 925 926 MODULE_DESCRIPTION(OTI6858_DESCRIPTION); 927 MODULE_AUTHOR(OTI6858_AUTHOR); 928 MODULE_VERSION(OTI6858_VERSION); 929 MODULE_LICENSE("GPL"); 930 931 module_param(debug, bool, S_IRUGO | S_IWUSR); 932 MODULE_PARM_DESC(debug, "enable debug output"); 933 934