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 bool debug; 70 71 /* requests */ 72 #define OTI6858_REQ_GET_STATUS (USB_DIR_IN | USB_TYPE_VENDOR | 0x00) 73 #define OTI6858_REQ_T_GET_STATUS 0x01 74 75 #define OTI6858_REQ_SET_LINE (USB_DIR_OUT | USB_TYPE_VENDOR | 0x00) 76 #define OTI6858_REQ_T_SET_LINE 0x00 77 78 #define OTI6858_REQ_CHECK_TXBUFF (USB_DIR_IN | USB_TYPE_VENDOR | 0x01) 79 #define OTI6858_REQ_T_CHECK_TXBUFF 0x00 80 81 /* format of the control packet */ 82 struct oti6858_control_pkt { 83 __le16 divisor; /* baud rate = 96000000 / (16 * divisor), LE */ 84 #define OTI6858_MAX_BAUD_RATE 3000000 85 u8 frame_fmt; 86 #define FMT_STOP_BITS_MASK 0xc0 87 #define FMT_STOP_BITS_1 0x00 88 #define FMT_STOP_BITS_2 0x40 /* 1.5 stop bits if FMT_DATA_BITS_5 */ 89 #define FMT_PARITY_MASK 0x38 90 #define FMT_PARITY_NONE 0x00 91 #define FMT_PARITY_ODD 0x08 92 #define FMT_PARITY_EVEN 0x18 93 #define FMT_PARITY_MARK 0x28 94 #define FMT_PARITY_SPACE 0x38 95 #define FMT_DATA_BITS_MASK 0x03 96 #define FMT_DATA_BITS_5 0x00 97 #define FMT_DATA_BITS_6 0x01 98 #define FMT_DATA_BITS_7 0x02 99 #define FMT_DATA_BITS_8 0x03 100 u8 something; /* always equals 0x43 */ 101 u8 control; /* settings of flow control lines */ 102 #define CONTROL_MASK 0x0c 103 #define CONTROL_DTR_HIGH 0x08 104 #define CONTROL_RTS_HIGH 0x04 105 u8 tx_status; 106 #define TX_BUFFER_EMPTIED 0x09 107 u8 pin_state; 108 #define PIN_MASK 0x3f 109 #define PIN_RTS 0x20 /* output pin */ 110 #define PIN_CTS 0x10 /* input pin, active low */ 111 #define PIN_DSR 0x08 /* input pin, active low */ 112 #define PIN_DTR 0x04 /* output pin */ 113 #define PIN_RI 0x02 /* input pin, active low */ 114 #define PIN_DCD 0x01 /* input pin, active low */ 115 u8 rx_bytes_avail; /* number of bytes in rx buffer */; 116 }; 117 118 #define OTI6858_CTRL_PKT_SIZE sizeof(struct oti6858_control_pkt) 119 #define OTI6858_CTRL_EQUALS_PENDING(a, priv) \ 120 (((a)->divisor == (priv)->pending_setup.divisor) \ 121 && ((a)->control == (priv)->pending_setup.control) \ 122 && ((a)->frame_fmt == (priv)->pending_setup.frame_fmt)) 123 124 /* function prototypes */ 125 static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port); 126 static void oti6858_close(struct usb_serial_port *port); 127 static void oti6858_set_termios(struct tty_struct *tty, 128 struct usb_serial_port *port, struct ktermios *old); 129 static void oti6858_init_termios(struct tty_struct *tty); 130 static int oti6858_ioctl(struct tty_struct *tty, 131 unsigned int cmd, unsigned long arg); 132 static void oti6858_read_int_callback(struct urb *urb); 133 static void oti6858_read_bulk_callback(struct urb *urb); 134 static void oti6858_write_bulk_callback(struct urb *urb); 135 static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port, 136 const unsigned char *buf, int count); 137 static int oti6858_write_room(struct tty_struct *tty); 138 static int oti6858_chars_in_buffer(struct tty_struct *tty); 139 static int oti6858_tiocmget(struct tty_struct *tty); 140 static int oti6858_tiocmset(struct tty_struct *tty, 141 unsigned int set, unsigned int clear); 142 static int oti6858_startup(struct usb_serial *serial); 143 static void oti6858_release(struct usb_serial *serial); 144 145 /* device info */ 146 static struct usb_serial_driver oti6858_device = { 147 .driver = { 148 .owner = THIS_MODULE, 149 .name = "oti6858", 150 }, 151 .id_table = id_table, 152 .num_ports = 1, 153 .open = oti6858_open, 154 .close = oti6858_close, 155 .write = oti6858_write, 156 .ioctl = oti6858_ioctl, 157 .set_termios = oti6858_set_termios, 158 .init_termios = oti6858_init_termios, 159 .tiocmget = oti6858_tiocmget, 160 .tiocmset = oti6858_tiocmset, 161 .read_bulk_callback = oti6858_read_bulk_callback, 162 .read_int_callback = oti6858_read_int_callback, 163 .write_bulk_callback = oti6858_write_bulk_callback, 164 .write_room = oti6858_write_room, 165 .chars_in_buffer = oti6858_chars_in_buffer, 166 .attach = oti6858_startup, 167 .release = oti6858_release, 168 }; 169 170 static struct usb_serial_driver * const serial_drivers[] = { 171 &oti6858_device, NULL 172 }; 173 174 struct oti6858_private { 175 spinlock_t lock; 176 177 struct oti6858_control_pkt status; 178 179 struct { 180 u8 read_urb_in_use; 181 u8 write_urb_in_use; 182 } flags; 183 struct delayed_work delayed_write_work; 184 185 struct { 186 __le16 divisor; 187 u8 frame_fmt; 188 u8 control; 189 } pending_setup; 190 u8 transient; 191 u8 setup_done; 192 struct delayed_work delayed_setup_work; 193 194 wait_queue_head_t intr_wait; 195 struct usb_serial_port *port; /* USB port with which associated */ 196 }; 197 198 static void setup_line(struct work_struct *work) 199 { 200 struct oti6858_private *priv = container_of(work, 201 struct oti6858_private, delayed_setup_work.work); 202 struct usb_serial_port *port = priv->port; 203 struct oti6858_control_pkt *new_setup; 204 unsigned long flags; 205 int result; 206 207 new_setup = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL); 208 if (new_setup == NULL) { 209 dev_err(&port->dev, "%s(): out of memory!\n", __func__); 210 /* we will try again */ 211 schedule_delayed_work(&priv->delayed_setup_work, 212 msecs_to_jiffies(2)); 213 return; 214 } 215 216 result = usb_control_msg(port->serial->dev, 217 usb_rcvctrlpipe(port->serial->dev, 0), 218 OTI6858_REQ_T_GET_STATUS, 219 OTI6858_REQ_GET_STATUS, 220 0, 0, 221 new_setup, OTI6858_CTRL_PKT_SIZE, 222 100); 223 224 if (result != OTI6858_CTRL_PKT_SIZE) { 225 dev_err(&port->dev, "%s(): error reading status\n", __func__); 226 kfree(new_setup); 227 /* we will try again */ 228 schedule_delayed_work(&priv->delayed_setup_work, 229 msecs_to_jiffies(2)); 230 return; 231 } 232 233 spin_lock_irqsave(&priv->lock, flags); 234 if (!OTI6858_CTRL_EQUALS_PENDING(new_setup, priv)) { 235 new_setup->divisor = priv->pending_setup.divisor; 236 new_setup->control = priv->pending_setup.control; 237 new_setup->frame_fmt = priv->pending_setup.frame_fmt; 238 239 spin_unlock_irqrestore(&priv->lock, flags); 240 result = usb_control_msg(port->serial->dev, 241 usb_sndctrlpipe(port->serial->dev, 0), 242 OTI6858_REQ_T_SET_LINE, 243 OTI6858_REQ_SET_LINE, 244 0, 0, 245 new_setup, OTI6858_CTRL_PKT_SIZE, 246 100); 247 } else { 248 spin_unlock_irqrestore(&priv->lock, flags); 249 result = 0; 250 } 251 kfree(new_setup); 252 253 spin_lock_irqsave(&priv->lock, flags); 254 if (result != OTI6858_CTRL_PKT_SIZE) 255 priv->transient = 0; 256 priv->setup_done = 1; 257 spin_unlock_irqrestore(&priv->lock, flags); 258 259 dbg("%s(): submitting interrupt urb", __func__); 260 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); 261 if (result != 0) { 262 dev_err(&port->dev, "%s(): usb_submit_urb() failed" 263 " with error %d\n", __func__, result); 264 } 265 } 266 267 static void send_data(struct work_struct *work) 268 { 269 struct oti6858_private *priv = container_of(work, 270 struct oti6858_private, delayed_write_work.work); 271 struct usb_serial_port *port = priv->port; 272 int count = 0, result; 273 unsigned long flags; 274 u8 *allow; 275 276 spin_lock_irqsave(&priv->lock, flags); 277 if (priv->flags.write_urb_in_use) { 278 spin_unlock_irqrestore(&priv->lock, flags); 279 schedule_delayed_work(&priv->delayed_write_work, 280 msecs_to_jiffies(2)); 281 return; 282 } 283 priv->flags.write_urb_in_use = 1; 284 spin_unlock_irqrestore(&priv->lock, flags); 285 286 spin_lock_irqsave(&port->lock, flags); 287 count = kfifo_len(&port->write_fifo); 288 spin_unlock_irqrestore(&port->lock, flags); 289 290 if (count > port->bulk_out_size) 291 count = port->bulk_out_size; 292 293 if (count != 0) { 294 allow = kmalloc(1, GFP_KERNEL); 295 if (!allow) { 296 dev_err_console(port, "%s(): kmalloc failed\n", 297 __func__); 298 return; 299 } 300 result = usb_control_msg(port->serial->dev, 301 usb_rcvctrlpipe(port->serial->dev, 0), 302 OTI6858_REQ_T_CHECK_TXBUFF, 303 OTI6858_REQ_CHECK_TXBUFF, 304 count, 0, allow, 1, 100); 305 if (result != 1 || *allow != 0) 306 count = 0; 307 kfree(allow); 308 } 309 310 if (count == 0) { 311 priv->flags.write_urb_in_use = 0; 312 313 dbg("%s(): submitting interrupt urb", __func__); 314 result = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO); 315 if (result != 0) { 316 dev_err(&port->dev, "%s(): usb_submit_urb() failed" 317 " with error %d\n", __func__, result); 318 } 319 return; 320 } 321 322 count = kfifo_out_locked(&port->write_fifo, 323 port->write_urb->transfer_buffer, 324 count, &port->lock); 325 port->write_urb->transfer_buffer_length = count; 326 result = usb_submit_urb(port->write_urb, GFP_NOIO); 327 if (result != 0) { 328 dev_err_console(port, "%s(): usb_submit_urb() failed" 329 " with error %d\n", __func__, result); 330 priv->flags.write_urb_in_use = 0; 331 } 332 333 usb_serial_port_softint(port); 334 } 335 336 static int oti6858_startup(struct usb_serial *serial) 337 { 338 struct usb_serial_port *port = serial->port[0]; 339 struct oti6858_private *priv; 340 int i; 341 342 for (i = 0; i < serial->num_ports; ++i) { 343 priv = kzalloc(sizeof(struct oti6858_private), GFP_KERNEL); 344 if (!priv) 345 break; 346 347 spin_lock_init(&priv->lock); 348 init_waitqueue_head(&priv->intr_wait); 349 /* INIT_WORK(&priv->setup_work, setup_line, serial->port[i]); */ 350 /* INIT_WORK(&priv->write_work, send_data, serial->port[i]); */ 351 priv->port = port; 352 INIT_DELAYED_WORK(&priv->delayed_setup_work, setup_line); 353 INIT_DELAYED_WORK(&priv->delayed_write_work, send_data); 354 355 usb_set_serial_port_data(serial->port[i], priv); 356 } 357 if (i == serial->num_ports) 358 return 0; 359 360 for (--i; i >= 0; --i) { 361 priv = usb_get_serial_port_data(serial->port[i]); 362 kfree(priv); 363 usb_set_serial_port_data(serial->port[i], NULL); 364 } 365 return -ENOMEM; 366 } 367 368 static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port, 369 const unsigned char *buf, int count) 370 { 371 if (!count) 372 return count; 373 374 count = kfifo_in_locked(&port->write_fifo, buf, count, &port->lock); 375 376 return count; 377 } 378 379 static int oti6858_write_room(struct tty_struct *tty) 380 { 381 struct usb_serial_port *port = tty->driver_data; 382 int room = 0; 383 unsigned long flags; 384 385 spin_lock_irqsave(&port->lock, flags); 386 room = kfifo_avail(&port->write_fifo); 387 spin_unlock_irqrestore(&port->lock, flags); 388 389 return room; 390 } 391 392 static int oti6858_chars_in_buffer(struct tty_struct *tty) 393 { 394 struct usb_serial_port *port = tty->driver_data; 395 int chars = 0; 396 unsigned long flags; 397 398 spin_lock_irqsave(&port->lock, flags); 399 chars = kfifo_len(&port->write_fifo); 400 spin_unlock_irqrestore(&port->lock, flags); 401 402 return chars; 403 } 404 405 static void oti6858_init_termios(struct tty_struct *tty) 406 { 407 *(tty->termios) = tty_std_termios; 408 tty->termios->c_cflag = B38400 | CS8 | CREAD | HUPCL | CLOCAL; 409 tty->termios->c_ispeed = 38400; 410 tty->termios->c_ospeed = 38400; 411 } 412 413 static void oti6858_set_termios(struct tty_struct *tty, 414 struct usb_serial_port *port, struct ktermios *old_termios) 415 { 416 struct oti6858_private *priv = usb_get_serial_port_data(port); 417 unsigned long flags; 418 unsigned int cflag; 419 u8 frame_fmt, control; 420 __le16 divisor; 421 int br; 422 423 if (!tty) { 424 dbg("%s(): no tty structures", __func__); 425 return; 426 } 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 ktermios tmp_termios; 524 struct usb_serial *serial = port->serial; 525 struct oti6858_control_pkt *buf; 526 unsigned long flags; 527 int result; 528 529 usb_clear_halt(serial->dev, port->write_urb->pipe); 530 usb_clear_halt(serial->dev, port->read_urb->pipe); 531 532 buf = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL); 533 if (buf == NULL) { 534 dev_err(&port->dev, "%s(): out of memory!\n", __func__); 535 return -ENOMEM; 536 } 537 538 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 539 OTI6858_REQ_T_GET_STATUS, 540 OTI6858_REQ_GET_STATUS, 541 0, 0, 542 buf, OTI6858_CTRL_PKT_SIZE, 543 100); 544 if (result != OTI6858_CTRL_PKT_SIZE) { 545 /* assume default (after power-on reset) values */ 546 buf->divisor = cpu_to_le16(0x009c); /* 38400 bps */ 547 buf->frame_fmt = 0x03; /* 8N1 */ 548 buf->something = 0x43; 549 buf->control = 0x4c; /* DTR, RTS */ 550 buf->tx_status = 0x00; 551 buf->pin_state = 0x5b; /* RTS, CTS, DSR, DTR, RI, DCD */ 552 buf->rx_bytes_avail = 0x00; 553 } 554 555 spin_lock_irqsave(&priv->lock, flags); 556 memcpy(&priv->status, buf, OTI6858_CTRL_PKT_SIZE); 557 priv->pending_setup.divisor = buf->divisor; 558 priv->pending_setup.frame_fmt = buf->frame_fmt; 559 priv->pending_setup.control = buf->control; 560 spin_unlock_irqrestore(&priv->lock, flags); 561 kfree(buf); 562 563 dbg("%s(): submitting interrupt urb", __func__); 564 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); 565 if (result != 0) { 566 dev_err(&port->dev, "%s(): usb_submit_urb() failed" 567 " with error %d\n", __func__, result); 568 oti6858_close(port); 569 return result; 570 } 571 572 /* setup termios */ 573 if (tty) 574 oti6858_set_termios(tty, port, &tmp_termios); 575 port->port.drain_delay = 256; /* FIXME: check the FIFO length */ 576 return 0; 577 } 578 579 static void oti6858_close(struct usb_serial_port *port) 580 { 581 struct oti6858_private *priv = usb_get_serial_port_data(port); 582 unsigned long flags; 583 584 spin_lock_irqsave(&port->lock, flags); 585 /* clear out any remaining data in the buffer */ 586 kfifo_reset_out(&port->write_fifo); 587 spin_unlock_irqrestore(&port->lock, flags); 588 589 dbg("%s(): after buf_clear()", __func__); 590 591 /* cancel scheduled setup */ 592 cancel_delayed_work_sync(&priv->delayed_setup_work); 593 cancel_delayed_work_sync(&priv->delayed_write_work); 594 595 /* shutdown our urbs */ 596 dbg("%s(): shutting down urbs", __func__); 597 usb_kill_urb(port->write_urb); 598 usb_kill_urb(port->read_urb); 599 usb_kill_urb(port->interrupt_in_urb); 600 } 601 602 static int oti6858_tiocmset(struct tty_struct *tty, 603 unsigned int set, unsigned int clear) 604 { 605 struct usb_serial_port *port = tty->driver_data; 606 struct oti6858_private *priv = usb_get_serial_port_data(port); 607 unsigned long flags; 608 u8 control; 609 610 dbg("%s(port = %d, set = 0x%08x, clear = 0x%08x)", 611 __func__, port->number, set, clear); 612 613 /* FIXME: check if this is correct (active high/low) */ 614 spin_lock_irqsave(&priv->lock, flags); 615 control = priv->pending_setup.control; 616 if ((set & TIOCM_RTS) != 0) 617 control |= CONTROL_RTS_HIGH; 618 if ((set & TIOCM_DTR) != 0) 619 control |= CONTROL_DTR_HIGH; 620 if ((clear & TIOCM_RTS) != 0) 621 control &= ~CONTROL_RTS_HIGH; 622 if ((clear & TIOCM_DTR) != 0) 623 control &= ~CONTROL_DTR_HIGH; 624 625 if (control != priv->pending_setup.control) 626 priv->pending_setup.control = control; 627 628 spin_unlock_irqrestore(&priv->lock, flags); 629 return 0; 630 } 631 632 static int oti6858_tiocmget(struct tty_struct *tty) 633 { 634 struct usb_serial_port *port = tty->driver_data; 635 struct oti6858_private *priv = usb_get_serial_port_data(port); 636 unsigned long flags; 637 unsigned pin_state; 638 unsigned result = 0; 639 640 spin_lock_irqsave(&priv->lock, flags); 641 pin_state = priv->status.pin_state & PIN_MASK; 642 spin_unlock_irqrestore(&priv->lock, flags); 643 644 /* FIXME: check if this is correct (active high/low) */ 645 if ((pin_state & PIN_RTS) != 0) 646 result |= TIOCM_RTS; 647 if ((pin_state & PIN_CTS) != 0) 648 result |= TIOCM_CTS; 649 if ((pin_state & PIN_DSR) != 0) 650 result |= TIOCM_DSR; 651 if ((pin_state & PIN_DTR) != 0) 652 result |= TIOCM_DTR; 653 if ((pin_state & PIN_RI) != 0) 654 result |= TIOCM_RI; 655 if ((pin_state & PIN_DCD) != 0) 656 result |= TIOCM_CD; 657 658 dbg("%s() = 0x%08x", __func__, result); 659 660 return result; 661 } 662 663 static int wait_modem_info(struct usb_serial_port *port, unsigned int arg) 664 { 665 struct oti6858_private *priv = usb_get_serial_port_data(port); 666 unsigned long flags; 667 unsigned int prev, status; 668 unsigned int changed; 669 670 spin_lock_irqsave(&priv->lock, flags); 671 prev = priv->status.pin_state; 672 spin_unlock_irqrestore(&priv->lock, flags); 673 674 while (1) { 675 wait_event_interruptible(priv->intr_wait, 676 priv->status.pin_state != prev); 677 if (signal_pending(current)) 678 return -ERESTARTSYS; 679 680 spin_lock_irqsave(&priv->lock, flags); 681 status = priv->status.pin_state & PIN_MASK; 682 spin_unlock_irqrestore(&priv->lock, flags); 683 684 changed = prev ^ status; 685 /* FIXME: check if this is correct (active high/low) */ 686 if (((arg & TIOCM_RNG) && (changed & PIN_RI)) || 687 ((arg & TIOCM_DSR) && (changed & PIN_DSR)) || 688 ((arg & TIOCM_CD) && (changed & PIN_DCD)) || 689 ((arg & TIOCM_CTS) && (changed & PIN_CTS))) 690 return 0; 691 prev = status; 692 } 693 694 /* NOTREACHED */ 695 return 0; 696 } 697 698 static int oti6858_ioctl(struct tty_struct *tty, 699 unsigned int cmd, unsigned long arg) 700 { 701 struct usb_serial_port *port = tty->driver_data; 702 703 dbg("%s(port = %d, cmd = 0x%04x, arg = 0x%08lx)", 704 __func__, port->number, cmd, arg); 705 706 switch (cmd) { 707 case TIOCMIWAIT: 708 dbg("%s(): TIOCMIWAIT", __func__); 709 return wait_modem_info(port, arg); 710 default: 711 dbg("%s(): 0x%04x not supported", __func__, cmd); 712 break; 713 } 714 return -ENOIOCTLCMD; 715 } 716 717 718 static void oti6858_release(struct usb_serial *serial) 719 { 720 int i; 721 722 for (i = 0; i < serial->num_ports; ++i) 723 kfree(usb_get_serial_port_data(serial->port[i])); 724 } 725 726 static void oti6858_read_int_callback(struct urb *urb) 727 { 728 struct usb_serial_port *port = urb->context; 729 struct oti6858_private *priv = usb_get_serial_port_data(port); 730 int transient = 0, can_recv = 0, resubmit = 1; 731 int status = urb->status; 732 733 switch (status) { 734 case 0: 735 /* success */ 736 break; 737 case -ECONNRESET: 738 case -ENOENT: 739 case -ESHUTDOWN: 740 /* this urb is terminated, clean up */ 741 dbg("%s(): urb shutting down with status: %d", 742 __func__, status); 743 return; 744 default: 745 dbg("%s(): nonzero urb status received: %d", 746 __func__, status); 747 break; 748 } 749 750 if (status == 0 && urb->actual_length == OTI6858_CTRL_PKT_SIZE) { 751 struct oti6858_control_pkt *xs = urb->transfer_buffer; 752 unsigned long flags; 753 754 spin_lock_irqsave(&priv->lock, flags); 755 756 if (!priv->transient) { 757 if (!OTI6858_CTRL_EQUALS_PENDING(xs, priv)) { 758 if (xs->rx_bytes_avail == 0) { 759 priv->transient = 4; 760 priv->setup_done = 0; 761 resubmit = 0; 762 dbg("%s(): scheduling setup_line()", 763 __func__); 764 schedule_delayed_work(&priv->delayed_setup_work, 0); 765 } 766 } 767 } else { 768 if (OTI6858_CTRL_EQUALS_PENDING(xs, priv)) { 769 priv->transient = 0; 770 } else if (!priv->setup_done) { 771 resubmit = 0; 772 } else if (--priv->transient == 0) { 773 if (xs->rx_bytes_avail == 0) { 774 priv->transient = 4; 775 priv->setup_done = 0; 776 resubmit = 0; 777 dbg("%s(): scheduling setup_line()", 778 __func__); 779 schedule_delayed_work(&priv->delayed_setup_work, 0); 780 } 781 } 782 } 783 784 if (!priv->transient) { 785 if (xs->pin_state != priv->status.pin_state) 786 wake_up_interruptible(&priv->intr_wait); 787 memcpy(&priv->status, xs, OTI6858_CTRL_PKT_SIZE); 788 } 789 790 if (!priv->transient && xs->rx_bytes_avail != 0) { 791 can_recv = xs->rx_bytes_avail; 792 priv->flags.read_urb_in_use = 1; 793 } 794 795 transient = priv->transient; 796 spin_unlock_irqrestore(&priv->lock, flags); 797 } 798 799 if (can_recv) { 800 int result; 801 802 result = usb_submit_urb(port->read_urb, GFP_ATOMIC); 803 if (result != 0) { 804 priv->flags.read_urb_in_use = 0; 805 dev_err(&port->dev, "%s(): usb_submit_urb() failed," 806 " error %d\n", __func__, result); 807 } else { 808 resubmit = 0; 809 } 810 } else if (!transient) { 811 unsigned long flags; 812 int count; 813 814 spin_lock_irqsave(&port->lock, flags); 815 count = kfifo_len(&port->write_fifo); 816 spin_unlock_irqrestore(&port->lock, flags); 817 818 spin_lock_irqsave(&priv->lock, flags); 819 if (priv->flags.write_urb_in_use == 0 && count != 0) { 820 schedule_delayed_work(&priv->delayed_write_work, 0); 821 resubmit = 0; 822 } 823 spin_unlock_irqrestore(&priv->lock, flags); 824 } 825 826 if (resubmit) { 827 int result; 828 829 /* dbg("%s(): submitting interrupt urb", __func__); */ 830 result = usb_submit_urb(urb, GFP_ATOMIC); 831 if (result != 0) { 832 dev_err(&urb->dev->dev, 833 "%s(): usb_submit_urb() failed with" 834 " error %d\n", __func__, result); 835 } 836 } 837 } 838 839 static void oti6858_read_bulk_callback(struct urb *urb) 840 { 841 struct usb_serial_port *port = urb->context; 842 struct oti6858_private *priv = usb_get_serial_port_data(port); 843 struct tty_struct *tty; 844 unsigned char *data = urb->transfer_buffer; 845 unsigned long flags; 846 int status = urb->status; 847 int result; 848 849 spin_lock_irqsave(&priv->lock, flags); 850 priv->flags.read_urb_in_use = 0; 851 spin_unlock_irqrestore(&priv->lock, flags); 852 853 if (status != 0) { 854 dbg("%s(): unable to handle the error, exiting", __func__); 855 return; 856 } 857 858 tty = tty_port_tty_get(&port->port); 859 if (tty != NULL && urb->actual_length > 0) { 860 tty_insert_flip_string(tty, data, urb->actual_length); 861 tty_flip_buffer_push(tty); 862 } 863 tty_kref_put(tty); 864 865 /* schedule the interrupt urb */ 866 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC); 867 if (result != 0 && result != -EPERM) { 868 dev_err(&port->dev, "%s(): usb_submit_urb() failed," 869 " error %d\n", __func__, result); 870 } 871 } 872 873 static void oti6858_write_bulk_callback(struct urb *urb) 874 { 875 struct usb_serial_port *port = urb->context; 876 struct oti6858_private *priv = usb_get_serial_port_data(port); 877 int status = urb->status; 878 int result; 879 880 switch (status) { 881 case 0: 882 /* success */ 883 break; 884 case -ECONNRESET: 885 case -ENOENT: 886 case -ESHUTDOWN: 887 /* this urb is terminated, clean up */ 888 dbg("%s(): urb shutting down with status: %d", 889 __func__, status); 890 priv->flags.write_urb_in_use = 0; 891 return; 892 default: 893 /* error in the urb, so we have to resubmit it */ 894 dbg("%s(): nonzero write bulk status received: %d", 895 __func__, status); 896 dbg("%s(): overflow in write", __func__); 897 898 port->write_urb->transfer_buffer_length = 1; 899 result = usb_submit_urb(port->write_urb, GFP_ATOMIC); 900 if (result) { 901 dev_err_console(port, "%s(): usb_submit_urb() failed," 902 " error %d\n", __func__, result); 903 } else { 904 return; 905 } 906 } 907 908 priv->flags.write_urb_in_use = 0; 909 910 /* schedule the interrupt urb if we are still open */ 911 dbg("%s(): submitting interrupt urb", __func__); 912 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC); 913 if (result != 0) { 914 dev_err(&port->dev, "%s(): failed submitting int urb," 915 " error %d\n", __func__, result); 916 } 917 } 918 919 module_usb_serial_driver(serial_drivers, id_table); 920 921 MODULE_DESCRIPTION(OTI6858_DESCRIPTION); 922 MODULE_AUTHOR(OTI6858_AUTHOR); 923 MODULE_VERSION(OTI6858_VERSION); 924 MODULE_LICENSE("GPL"); 925 926 module_param(debug, bool, S_IRUGO | S_IWUSR); 927 MODULE_PARM_DESC(debug, "enable debug output"); 928 929