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 /* requests */ 70 #define OTI6858_REQ_GET_STATUS (USB_DIR_IN | USB_TYPE_VENDOR | 0x00) 71 #define OTI6858_REQ_T_GET_STATUS 0x01 72 73 #define OTI6858_REQ_SET_LINE (USB_DIR_OUT | USB_TYPE_VENDOR | 0x00) 74 #define OTI6858_REQ_T_SET_LINE 0x00 75 76 #define OTI6858_REQ_CHECK_TXBUFF (USB_DIR_IN | USB_TYPE_VENDOR | 0x01) 77 #define OTI6858_REQ_T_CHECK_TXBUFF 0x00 78 79 /* format of the control packet */ 80 struct oti6858_control_pkt { 81 __le16 divisor; /* baud rate = 96000000 / (16 * divisor), LE */ 82 #define OTI6858_MAX_BAUD_RATE 3000000 83 u8 frame_fmt; 84 #define FMT_STOP_BITS_MASK 0xc0 85 #define FMT_STOP_BITS_1 0x00 86 #define FMT_STOP_BITS_2 0x40 /* 1.5 stop bits if FMT_DATA_BITS_5 */ 87 #define FMT_PARITY_MASK 0x38 88 #define FMT_PARITY_NONE 0x00 89 #define FMT_PARITY_ODD 0x08 90 #define FMT_PARITY_EVEN 0x18 91 #define FMT_PARITY_MARK 0x28 92 #define FMT_PARITY_SPACE 0x38 93 #define FMT_DATA_BITS_MASK 0x03 94 #define FMT_DATA_BITS_5 0x00 95 #define FMT_DATA_BITS_6 0x01 96 #define FMT_DATA_BITS_7 0x02 97 #define FMT_DATA_BITS_8 0x03 98 u8 something; /* always equals 0x43 */ 99 u8 control; /* settings of flow control lines */ 100 #define CONTROL_MASK 0x0c 101 #define CONTROL_DTR_HIGH 0x08 102 #define CONTROL_RTS_HIGH 0x04 103 u8 tx_status; 104 #define TX_BUFFER_EMPTIED 0x09 105 u8 pin_state; 106 #define PIN_MASK 0x3f 107 #define PIN_RTS 0x20 /* output pin */ 108 #define PIN_CTS 0x10 /* input pin, active low */ 109 #define PIN_DSR 0x08 /* input pin, active low */ 110 #define PIN_DTR 0x04 /* output pin */ 111 #define PIN_RI 0x02 /* input pin, active low */ 112 #define PIN_DCD 0x01 /* input pin, active low */ 113 u8 rx_bytes_avail; /* number of bytes in rx buffer */; 114 }; 115 116 #define OTI6858_CTRL_PKT_SIZE sizeof(struct oti6858_control_pkt) 117 #define OTI6858_CTRL_EQUALS_PENDING(a, priv) \ 118 (((a)->divisor == (priv)->pending_setup.divisor) \ 119 && ((a)->control == (priv)->pending_setup.control) \ 120 && ((a)->frame_fmt == (priv)->pending_setup.frame_fmt)) 121 122 /* function prototypes */ 123 static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port); 124 static void oti6858_close(struct usb_serial_port *port); 125 static void oti6858_set_termios(struct tty_struct *tty, 126 struct usb_serial_port *port, struct ktermios *old); 127 static void oti6858_init_termios(struct tty_struct *tty); 128 static int oti6858_ioctl(struct tty_struct *tty, 129 unsigned int cmd, unsigned long arg); 130 static void oti6858_read_int_callback(struct urb *urb); 131 static void oti6858_read_bulk_callback(struct urb *urb); 132 static void oti6858_write_bulk_callback(struct urb *urb); 133 static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port, 134 const unsigned char *buf, int count); 135 static int oti6858_write_room(struct tty_struct *tty); 136 static int oti6858_chars_in_buffer(struct tty_struct *tty); 137 static int oti6858_tiocmget(struct tty_struct *tty); 138 static int oti6858_tiocmset(struct tty_struct *tty, 139 unsigned int set, unsigned int clear); 140 static int oti6858_port_probe(struct usb_serial_port *port); 141 static int oti6858_port_remove(struct usb_serial_port *port); 142 143 /* device info */ 144 static struct usb_serial_driver oti6858_device = { 145 .driver = { 146 .owner = THIS_MODULE, 147 .name = "oti6858", 148 }, 149 .id_table = id_table, 150 .num_ports = 1, 151 .open = oti6858_open, 152 .close = oti6858_close, 153 .write = oti6858_write, 154 .ioctl = oti6858_ioctl, 155 .set_termios = oti6858_set_termios, 156 .init_termios = oti6858_init_termios, 157 .tiocmget = oti6858_tiocmget, 158 .tiocmset = oti6858_tiocmset, 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 wait_queue_head_t intr_wait; 193 struct usb_serial_port *port; /* USB port with which associated */ 194 }; 195 196 static void setup_line(struct work_struct *work) 197 { 198 struct oti6858_private *priv = container_of(work, 199 struct oti6858_private, delayed_setup_work.work); 200 struct usb_serial_port *port = priv->port; 201 struct oti6858_control_pkt *new_setup; 202 unsigned long flags; 203 int result; 204 205 new_setup = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL); 206 if (new_setup == NULL) { 207 dev_err(&port->dev, "%s(): out of memory!\n", __func__); 208 /* we will try again */ 209 schedule_delayed_work(&priv->delayed_setup_work, 210 msecs_to_jiffies(2)); 211 return; 212 } 213 214 result = usb_control_msg(port->serial->dev, 215 usb_rcvctrlpipe(port->serial->dev, 0), 216 OTI6858_REQ_T_GET_STATUS, 217 OTI6858_REQ_GET_STATUS, 218 0, 0, 219 new_setup, OTI6858_CTRL_PKT_SIZE, 220 100); 221 222 if (result != OTI6858_CTRL_PKT_SIZE) { 223 dev_err(&port->dev, "%s(): error reading status\n", __func__); 224 kfree(new_setup); 225 /* we will try again */ 226 schedule_delayed_work(&priv->delayed_setup_work, 227 msecs_to_jiffies(2)); 228 return; 229 } 230 231 spin_lock_irqsave(&priv->lock, flags); 232 if (!OTI6858_CTRL_EQUALS_PENDING(new_setup, priv)) { 233 new_setup->divisor = priv->pending_setup.divisor; 234 new_setup->control = priv->pending_setup.control; 235 new_setup->frame_fmt = priv->pending_setup.frame_fmt; 236 237 spin_unlock_irqrestore(&priv->lock, flags); 238 result = usb_control_msg(port->serial->dev, 239 usb_sndctrlpipe(port->serial->dev, 0), 240 OTI6858_REQ_T_SET_LINE, 241 OTI6858_REQ_SET_LINE, 242 0, 0, 243 new_setup, OTI6858_CTRL_PKT_SIZE, 244 100); 245 } else { 246 spin_unlock_irqrestore(&priv->lock, flags); 247 result = 0; 248 } 249 kfree(new_setup); 250 251 spin_lock_irqsave(&priv->lock, flags); 252 if (result != OTI6858_CTRL_PKT_SIZE) 253 priv->transient = 0; 254 priv->setup_done = 1; 255 spin_unlock_irqrestore(&priv->lock, flags); 256 257 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__); 258 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); 259 if (result != 0) { 260 dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n", 261 __func__, result); 262 } 263 } 264 265 static void send_data(struct work_struct *work) 266 { 267 struct oti6858_private *priv = container_of(work, 268 struct oti6858_private, delayed_write_work.work); 269 struct usb_serial_port *port = priv->port; 270 int count = 0, result; 271 unsigned long flags; 272 u8 *allow; 273 274 spin_lock_irqsave(&priv->lock, flags); 275 if (priv->flags.write_urb_in_use) { 276 spin_unlock_irqrestore(&priv->lock, flags); 277 schedule_delayed_work(&priv->delayed_write_work, 278 msecs_to_jiffies(2)); 279 return; 280 } 281 priv->flags.write_urb_in_use = 1; 282 spin_unlock_irqrestore(&priv->lock, flags); 283 284 spin_lock_irqsave(&port->lock, flags); 285 count = kfifo_len(&port->write_fifo); 286 spin_unlock_irqrestore(&port->lock, flags); 287 288 if (count > port->bulk_out_size) 289 count = port->bulk_out_size; 290 291 if (count != 0) { 292 allow = kmalloc(1, GFP_KERNEL); 293 if (!allow) { 294 dev_err_console(port, "%s(): kmalloc failed\n", 295 __func__); 296 return; 297 } 298 result = usb_control_msg(port->serial->dev, 299 usb_rcvctrlpipe(port->serial->dev, 0), 300 OTI6858_REQ_T_CHECK_TXBUFF, 301 OTI6858_REQ_CHECK_TXBUFF, 302 count, 0, allow, 1, 100); 303 if (result != 1 || *allow != 0) 304 count = 0; 305 kfree(allow); 306 } 307 308 if (count == 0) { 309 priv->flags.write_urb_in_use = 0; 310 311 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__); 312 result = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO); 313 if (result != 0) { 314 dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n", 315 __func__, result); 316 } 317 return; 318 } 319 320 count = kfifo_out_locked(&port->write_fifo, 321 port->write_urb->transfer_buffer, 322 count, &port->lock); 323 port->write_urb->transfer_buffer_length = count; 324 result = usb_submit_urb(port->write_urb, GFP_NOIO); 325 if (result != 0) { 326 dev_err_console(port, "%s(): usb_submit_urb() failed with error %d\n", 327 __func__, result); 328 priv->flags.write_urb_in_use = 0; 329 } 330 331 usb_serial_port_softint(port); 332 } 333 334 static int oti6858_port_probe(struct usb_serial_port *port) 335 { 336 struct oti6858_private *priv; 337 338 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 339 if (!priv) 340 return -ENOMEM; 341 342 spin_lock_init(&priv->lock); 343 init_waitqueue_head(&priv->intr_wait); 344 priv->port = port; 345 INIT_DELAYED_WORK(&priv->delayed_setup_work, setup_line); 346 INIT_DELAYED_WORK(&priv->delayed_write_work, send_data); 347 348 usb_set_serial_port_data(port, priv); 349 350 return 0; 351 } 352 353 static int oti6858_port_remove(struct usb_serial_port *port) 354 { 355 struct oti6858_private *priv; 356 357 priv = usb_get_serial_port_data(port); 358 kfree(priv); 359 360 return 0; 361 } 362 363 static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port, 364 const unsigned char *buf, int count) 365 { 366 if (!count) 367 return count; 368 369 count = kfifo_in_locked(&port->write_fifo, buf, count, &port->lock); 370 371 return count; 372 } 373 374 static int oti6858_write_room(struct tty_struct *tty) 375 { 376 struct usb_serial_port *port = tty->driver_data; 377 int room = 0; 378 unsigned long flags; 379 380 spin_lock_irqsave(&port->lock, flags); 381 room = kfifo_avail(&port->write_fifo); 382 spin_unlock_irqrestore(&port->lock, flags); 383 384 return room; 385 } 386 387 static int oti6858_chars_in_buffer(struct tty_struct *tty) 388 { 389 struct usb_serial_port *port = tty->driver_data; 390 int chars = 0; 391 unsigned long flags; 392 393 spin_lock_irqsave(&port->lock, flags); 394 chars = kfifo_len(&port->write_fifo); 395 spin_unlock_irqrestore(&port->lock, flags); 396 397 return chars; 398 } 399 400 static void oti6858_init_termios(struct tty_struct *tty) 401 { 402 tty->termios = tty_std_termios; 403 tty->termios.c_cflag = B38400 | CS8 | CREAD | HUPCL | CLOCAL; 404 tty->termios.c_ispeed = 38400; 405 tty->termios.c_ospeed = 38400; 406 } 407 408 static void oti6858_set_termios(struct tty_struct *tty, 409 struct usb_serial_port *port, struct ktermios *old_termios) 410 { 411 struct oti6858_private *priv = usb_get_serial_port_data(port); 412 unsigned long flags; 413 unsigned int cflag; 414 u8 frame_fmt, control; 415 __le16 divisor; 416 int br; 417 418 if (!tty) 419 return; 420 421 cflag = tty->termios.c_cflag; 422 423 spin_lock_irqsave(&priv->lock, flags); 424 divisor = priv->pending_setup.divisor; 425 frame_fmt = priv->pending_setup.frame_fmt; 426 control = priv->pending_setup.control; 427 spin_unlock_irqrestore(&priv->lock, flags); 428 429 frame_fmt &= ~FMT_DATA_BITS_MASK; 430 switch (cflag & CSIZE) { 431 case CS5: 432 frame_fmt |= FMT_DATA_BITS_5; 433 break; 434 case CS6: 435 frame_fmt |= FMT_DATA_BITS_6; 436 break; 437 case CS7: 438 frame_fmt |= FMT_DATA_BITS_7; 439 break; 440 default: 441 case CS8: 442 frame_fmt |= FMT_DATA_BITS_8; 443 break; 444 } 445 446 /* manufacturer claims that this device can work with baud rates 447 * up to 3 Mbps; I've tested it only on 115200 bps, so I can't 448 * guarantee that any other baud rate will work (especially 449 * the higher ones) 450 */ 451 br = tty_get_baud_rate(tty); 452 if (br == 0) { 453 divisor = 0; 454 } else { 455 int real_br; 456 int new_divisor; 457 br = min(br, OTI6858_MAX_BAUD_RATE); 458 459 new_divisor = (96000000 + 8 * br) / (16 * br); 460 real_br = 96000000 / (16 * new_divisor); 461 divisor = cpu_to_le16(new_divisor); 462 tty_encode_baud_rate(tty, real_br, real_br); 463 } 464 465 frame_fmt &= ~FMT_STOP_BITS_MASK; 466 if ((cflag & CSTOPB) != 0) 467 frame_fmt |= FMT_STOP_BITS_2; 468 else 469 frame_fmt |= FMT_STOP_BITS_1; 470 471 frame_fmt &= ~FMT_PARITY_MASK; 472 if ((cflag & PARENB) != 0) { 473 if ((cflag & PARODD) != 0) 474 frame_fmt |= FMT_PARITY_ODD; 475 else 476 frame_fmt |= FMT_PARITY_EVEN; 477 } else { 478 frame_fmt |= FMT_PARITY_NONE; 479 } 480 481 control &= ~CONTROL_MASK; 482 if ((cflag & CRTSCTS) != 0) 483 control |= (CONTROL_DTR_HIGH | CONTROL_RTS_HIGH); 484 485 /* change control lines if we are switching to or from B0 */ 486 /* FIXME: 487 spin_lock_irqsave(&priv->lock, flags); 488 control = priv->line_control; 489 if ((cflag & CBAUD) == B0) 490 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS); 491 else 492 priv->line_control |= (CONTROL_DTR | CONTROL_RTS); 493 if (control != priv->line_control) { 494 control = priv->line_control; 495 spin_unlock_irqrestore(&priv->lock, flags); 496 set_control_lines(serial->dev, control); 497 } else { 498 spin_unlock_irqrestore(&priv->lock, flags); 499 } 500 */ 501 502 spin_lock_irqsave(&priv->lock, flags); 503 if (divisor != priv->pending_setup.divisor 504 || control != priv->pending_setup.control 505 || frame_fmt != priv->pending_setup.frame_fmt) { 506 priv->pending_setup.divisor = divisor; 507 priv->pending_setup.control = control; 508 priv->pending_setup.frame_fmt = frame_fmt; 509 } 510 spin_unlock_irqrestore(&priv->lock, flags); 511 } 512 513 static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port) 514 { 515 struct oti6858_private *priv = usb_get_serial_port_data(port); 516 struct ktermios tmp_termios; 517 struct usb_serial *serial = port->serial; 518 struct oti6858_control_pkt *buf; 519 unsigned long flags; 520 int result; 521 522 usb_clear_halt(serial->dev, port->write_urb->pipe); 523 usb_clear_halt(serial->dev, port->read_urb->pipe); 524 525 buf = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL); 526 if (buf == NULL) { 527 dev_err(&port->dev, "%s(): out of memory!\n", __func__); 528 return -ENOMEM; 529 } 530 531 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 532 OTI6858_REQ_T_GET_STATUS, 533 OTI6858_REQ_GET_STATUS, 534 0, 0, 535 buf, OTI6858_CTRL_PKT_SIZE, 536 100); 537 if (result != OTI6858_CTRL_PKT_SIZE) { 538 /* assume default (after power-on reset) values */ 539 buf->divisor = cpu_to_le16(0x009c); /* 38400 bps */ 540 buf->frame_fmt = 0x03; /* 8N1 */ 541 buf->something = 0x43; 542 buf->control = 0x4c; /* DTR, RTS */ 543 buf->tx_status = 0x00; 544 buf->pin_state = 0x5b; /* RTS, CTS, DSR, DTR, RI, DCD */ 545 buf->rx_bytes_avail = 0x00; 546 } 547 548 spin_lock_irqsave(&priv->lock, flags); 549 memcpy(&priv->status, buf, OTI6858_CTRL_PKT_SIZE); 550 priv->pending_setup.divisor = buf->divisor; 551 priv->pending_setup.frame_fmt = buf->frame_fmt; 552 priv->pending_setup.control = buf->control; 553 spin_unlock_irqrestore(&priv->lock, flags); 554 kfree(buf); 555 556 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__); 557 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); 558 if (result != 0) { 559 dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n", 560 __func__, result); 561 oti6858_close(port); 562 return result; 563 } 564 565 /* setup termios */ 566 if (tty) 567 oti6858_set_termios(tty, port, &tmp_termios); 568 port->port.drain_delay = 256; /* FIXME: check the FIFO length */ 569 return 0; 570 } 571 572 static void oti6858_close(struct usb_serial_port *port) 573 { 574 struct oti6858_private *priv = usb_get_serial_port_data(port); 575 unsigned long flags; 576 577 spin_lock_irqsave(&port->lock, flags); 578 /* clear out any remaining data in the buffer */ 579 kfifo_reset_out(&port->write_fifo); 580 spin_unlock_irqrestore(&port->lock, flags); 581 582 dev_dbg(&port->dev, "%s(): after buf_clear()\n", __func__); 583 584 /* cancel scheduled setup */ 585 cancel_delayed_work_sync(&priv->delayed_setup_work); 586 cancel_delayed_work_sync(&priv->delayed_write_work); 587 588 /* shutdown our urbs */ 589 dev_dbg(&port->dev, "%s(): shutting down urbs\n", __func__); 590 usb_kill_urb(port->write_urb); 591 usb_kill_urb(port->read_urb); 592 usb_kill_urb(port->interrupt_in_urb); 593 } 594 595 static int oti6858_tiocmset(struct tty_struct *tty, 596 unsigned int set, unsigned int clear) 597 { 598 struct usb_serial_port *port = tty->driver_data; 599 struct oti6858_private *priv = usb_get_serial_port_data(port); 600 unsigned long flags; 601 u8 control; 602 603 dev_dbg(&port->dev, "%s(set = 0x%08x, clear = 0x%08x)\n", 604 __func__, set, clear); 605 606 /* FIXME: check if this is correct (active high/low) */ 607 spin_lock_irqsave(&priv->lock, flags); 608 control = priv->pending_setup.control; 609 if ((set & TIOCM_RTS) != 0) 610 control |= CONTROL_RTS_HIGH; 611 if ((set & TIOCM_DTR) != 0) 612 control |= CONTROL_DTR_HIGH; 613 if ((clear & TIOCM_RTS) != 0) 614 control &= ~CONTROL_RTS_HIGH; 615 if ((clear & TIOCM_DTR) != 0) 616 control &= ~CONTROL_DTR_HIGH; 617 618 if (control != priv->pending_setup.control) 619 priv->pending_setup.control = control; 620 621 spin_unlock_irqrestore(&priv->lock, flags); 622 return 0; 623 } 624 625 static int oti6858_tiocmget(struct tty_struct *tty) 626 { 627 struct usb_serial_port *port = tty->driver_data; 628 struct oti6858_private *priv = usb_get_serial_port_data(port); 629 unsigned long flags; 630 unsigned pin_state; 631 unsigned result = 0; 632 633 spin_lock_irqsave(&priv->lock, flags); 634 pin_state = priv->status.pin_state & PIN_MASK; 635 spin_unlock_irqrestore(&priv->lock, flags); 636 637 /* FIXME: check if this is correct (active high/low) */ 638 if ((pin_state & PIN_RTS) != 0) 639 result |= TIOCM_RTS; 640 if ((pin_state & PIN_CTS) != 0) 641 result |= TIOCM_CTS; 642 if ((pin_state & PIN_DSR) != 0) 643 result |= TIOCM_DSR; 644 if ((pin_state & PIN_DTR) != 0) 645 result |= TIOCM_DTR; 646 if ((pin_state & PIN_RI) != 0) 647 result |= TIOCM_RI; 648 if ((pin_state & PIN_DCD) != 0) 649 result |= TIOCM_CD; 650 651 dev_dbg(&port->dev, "%s() = 0x%08x\n", __func__, result); 652 653 return result; 654 } 655 656 static int wait_modem_info(struct usb_serial_port *port, unsigned int arg) 657 { 658 struct oti6858_private *priv = usb_get_serial_port_data(port); 659 unsigned long flags; 660 unsigned int prev, status; 661 unsigned int changed; 662 663 spin_lock_irqsave(&priv->lock, flags); 664 prev = priv->status.pin_state; 665 spin_unlock_irqrestore(&priv->lock, flags); 666 667 while (1) { 668 wait_event_interruptible(priv->intr_wait, 669 priv->status.pin_state != prev); 670 if (signal_pending(current)) 671 return -ERESTARTSYS; 672 673 spin_lock_irqsave(&priv->lock, flags); 674 status = priv->status.pin_state & PIN_MASK; 675 spin_unlock_irqrestore(&priv->lock, flags); 676 677 changed = prev ^ status; 678 /* FIXME: check if this is correct (active high/low) */ 679 if (((arg & TIOCM_RNG) && (changed & PIN_RI)) || 680 ((arg & TIOCM_DSR) && (changed & PIN_DSR)) || 681 ((arg & TIOCM_CD) && (changed & PIN_DCD)) || 682 ((arg & TIOCM_CTS) && (changed & PIN_CTS))) 683 return 0; 684 prev = status; 685 } 686 687 /* NOTREACHED */ 688 return 0; 689 } 690 691 static int oti6858_ioctl(struct tty_struct *tty, 692 unsigned int cmd, unsigned long arg) 693 { 694 struct usb_serial_port *port = tty->driver_data; 695 696 dev_dbg(&port->dev, "%s(cmd = 0x%04x, arg = 0x%08lx)\n", __func__, cmd, arg); 697 698 switch (cmd) { 699 case TIOCMIWAIT: 700 dev_dbg(&port->dev, "%s(): TIOCMIWAIT\n", __func__); 701 return wait_modem_info(port, arg); 702 default: 703 dev_dbg(&port->dev, "%s(): 0x%04x not supported\n", __func__, cmd); 704 break; 705 } 706 return -ENOIOCTLCMD; 707 } 708 709 static void oti6858_read_int_callback(struct urb *urb) 710 { 711 struct usb_serial_port *port = urb->context; 712 struct oti6858_private *priv = usb_get_serial_port_data(port); 713 int transient = 0, can_recv = 0, resubmit = 1; 714 int status = urb->status; 715 716 switch (status) { 717 case 0: 718 /* success */ 719 break; 720 case -ECONNRESET: 721 case -ENOENT: 722 case -ESHUTDOWN: 723 /* this urb is terminated, clean up */ 724 dev_dbg(&urb->dev->dev, "%s(): urb shutting down with status: %d\n", 725 __func__, status); 726 return; 727 default: 728 dev_dbg(&urb->dev->dev, "%s(): nonzero urb status received: %d\n", 729 __func__, status); 730 break; 731 } 732 733 if (status == 0 && urb->actual_length == OTI6858_CTRL_PKT_SIZE) { 734 struct oti6858_control_pkt *xs = urb->transfer_buffer; 735 unsigned long flags; 736 737 spin_lock_irqsave(&priv->lock, flags); 738 739 if (!priv->transient) { 740 if (!OTI6858_CTRL_EQUALS_PENDING(xs, priv)) { 741 if (xs->rx_bytes_avail == 0) { 742 priv->transient = 4; 743 priv->setup_done = 0; 744 resubmit = 0; 745 dev_dbg(&port->dev, "%s(): scheduling setup_line()\n", __func__); 746 schedule_delayed_work(&priv->delayed_setup_work, 0); 747 } 748 } 749 } else { 750 if (OTI6858_CTRL_EQUALS_PENDING(xs, priv)) { 751 priv->transient = 0; 752 } else if (!priv->setup_done) { 753 resubmit = 0; 754 } else if (--priv->transient == 0) { 755 if (xs->rx_bytes_avail == 0) { 756 priv->transient = 4; 757 priv->setup_done = 0; 758 resubmit = 0; 759 dev_dbg(&port->dev, "%s(): scheduling setup_line()\n", __func__); 760 schedule_delayed_work(&priv->delayed_setup_work, 0); 761 } 762 } 763 } 764 765 if (!priv->transient) { 766 if (xs->pin_state != priv->status.pin_state) 767 wake_up_interruptible(&priv->intr_wait); 768 memcpy(&priv->status, xs, OTI6858_CTRL_PKT_SIZE); 769 } 770 771 if (!priv->transient && xs->rx_bytes_avail != 0) { 772 can_recv = xs->rx_bytes_avail; 773 priv->flags.read_urb_in_use = 1; 774 } 775 776 transient = priv->transient; 777 spin_unlock_irqrestore(&priv->lock, flags); 778 } 779 780 if (can_recv) { 781 int result; 782 783 result = usb_submit_urb(port->read_urb, GFP_ATOMIC); 784 if (result != 0) { 785 priv->flags.read_urb_in_use = 0; 786 dev_err(&port->dev, "%s(): usb_submit_urb() failed," 787 " error %d\n", __func__, result); 788 } else { 789 resubmit = 0; 790 } 791 } else if (!transient) { 792 unsigned long flags; 793 int count; 794 795 spin_lock_irqsave(&port->lock, flags); 796 count = kfifo_len(&port->write_fifo); 797 spin_unlock_irqrestore(&port->lock, flags); 798 799 spin_lock_irqsave(&priv->lock, flags); 800 if (priv->flags.write_urb_in_use == 0 && count != 0) { 801 schedule_delayed_work(&priv->delayed_write_work, 0); 802 resubmit = 0; 803 } 804 spin_unlock_irqrestore(&priv->lock, flags); 805 } 806 807 if (resubmit) { 808 int result; 809 810 /* dev_dbg(&urb->dev->dev, "%s(): submitting interrupt urb\n", __func__); */ 811 result = usb_submit_urb(urb, GFP_ATOMIC); 812 if (result != 0) { 813 dev_err(&urb->dev->dev, 814 "%s(): usb_submit_urb() failed with" 815 " error %d\n", __func__, result); 816 } 817 } 818 } 819 820 static void oti6858_read_bulk_callback(struct urb *urb) 821 { 822 struct usb_serial_port *port = urb->context; 823 struct oti6858_private *priv = usb_get_serial_port_data(port); 824 struct tty_struct *tty; 825 unsigned char *data = urb->transfer_buffer; 826 unsigned long flags; 827 int status = urb->status; 828 int result; 829 830 spin_lock_irqsave(&priv->lock, flags); 831 priv->flags.read_urb_in_use = 0; 832 spin_unlock_irqrestore(&priv->lock, flags); 833 834 if (status != 0) { 835 dev_dbg(&urb->dev->dev, "%s(): unable to handle the error, exiting\n", __func__); 836 return; 837 } 838 839 tty = tty_port_tty_get(&port->port); 840 if (tty != NULL && urb->actual_length > 0) { 841 tty_insert_flip_string(tty, data, urb->actual_length); 842 tty_flip_buffer_push(tty); 843 } 844 tty_kref_put(tty); 845 846 /* schedule the interrupt urb */ 847 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC); 848 if (result != 0 && result != -EPERM) { 849 dev_err(&port->dev, "%s(): usb_submit_urb() failed," 850 " error %d\n", __func__, result); 851 } 852 } 853 854 static void oti6858_write_bulk_callback(struct urb *urb) 855 { 856 struct usb_serial_port *port = urb->context; 857 struct oti6858_private *priv = usb_get_serial_port_data(port); 858 int status = urb->status; 859 int result; 860 861 switch (status) { 862 case 0: 863 /* success */ 864 break; 865 case -ECONNRESET: 866 case -ENOENT: 867 case -ESHUTDOWN: 868 /* this urb is terminated, clean up */ 869 dev_dbg(&urb->dev->dev, "%s(): urb shutting down with status: %d\n", __func__, status); 870 priv->flags.write_urb_in_use = 0; 871 return; 872 default: 873 /* error in the urb, so we have to resubmit it */ 874 dev_dbg(&urb->dev->dev, "%s(): nonzero write bulk status received: %d\n", __func__, status); 875 dev_dbg(&urb->dev->dev, "%s(): overflow in write\n", __func__); 876 877 port->write_urb->transfer_buffer_length = 1; 878 result = usb_submit_urb(port->write_urb, GFP_ATOMIC); 879 if (result) { 880 dev_err_console(port, "%s(): usb_submit_urb() failed," 881 " error %d\n", __func__, result); 882 } else { 883 return; 884 } 885 } 886 887 priv->flags.write_urb_in_use = 0; 888 889 /* schedule the interrupt urb if we are still open */ 890 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__); 891 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC); 892 if (result != 0) { 893 dev_err(&port->dev, "%s(): failed submitting int urb," 894 " error %d\n", __func__, result); 895 } 896 } 897 898 module_usb_serial_driver(serial_drivers, id_table); 899 900 MODULE_DESCRIPTION(OTI6858_DESCRIPTION); 901 MODULE_AUTHOR(OTI6858_AUTHOR); 902 MODULE_VERSION(OTI6858_VERSION); 903 MODULE_LICENSE("GPL"); 904