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_startup(struct usb_serial *serial); 141 static void oti6858_release(struct usb_serial *serial); 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 .attach = oti6858_startup, 165 .release = oti6858_release, 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_startup(struct usb_serial *serial) 335 { 336 struct usb_serial_port *port = serial->port[0]; 337 struct oti6858_private *priv; 338 int i; 339 340 for (i = 0; i < serial->num_ports; ++i) { 341 priv = kzalloc(sizeof(struct oti6858_private), GFP_KERNEL); 342 if (!priv) 343 break; 344 345 spin_lock_init(&priv->lock); 346 init_waitqueue_head(&priv->intr_wait); 347 /* INIT_WORK(&priv->setup_work, setup_line, serial->port[i]); */ 348 /* INIT_WORK(&priv->write_work, send_data, serial->port[i]); */ 349 priv->port = port; 350 INIT_DELAYED_WORK(&priv->delayed_setup_work, setup_line); 351 INIT_DELAYED_WORK(&priv->delayed_write_work, send_data); 352 353 usb_set_serial_port_data(serial->port[i], priv); 354 } 355 if (i == serial->num_ports) 356 return 0; 357 358 for (--i; i >= 0; --i) { 359 priv = usb_get_serial_port_data(serial->port[i]); 360 kfree(priv); 361 usb_set_serial_port_data(serial->port[i], NULL); 362 } 363 return -ENOMEM; 364 } 365 366 static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port, 367 const unsigned char *buf, int count) 368 { 369 if (!count) 370 return count; 371 372 count = kfifo_in_locked(&port->write_fifo, buf, count, &port->lock); 373 374 return count; 375 } 376 377 static int oti6858_write_room(struct tty_struct *tty) 378 { 379 struct usb_serial_port *port = tty->driver_data; 380 int room = 0; 381 unsigned long flags; 382 383 spin_lock_irqsave(&port->lock, flags); 384 room = kfifo_avail(&port->write_fifo); 385 spin_unlock_irqrestore(&port->lock, flags); 386 387 return room; 388 } 389 390 static int oti6858_chars_in_buffer(struct tty_struct *tty) 391 { 392 struct usb_serial_port *port = tty->driver_data; 393 int chars = 0; 394 unsigned long flags; 395 396 spin_lock_irqsave(&port->lock, flags); 397 chars = kfifo_len(&port->write_fifo); 398 spin_unlock_irqrestore(&port->lock, flags); 399 400 return chars; 401 } 402 403 static void oti6858_init_termios(struct tty_struct *tty) 404 { 405 tty->termios = tty_std_termios; 406 tty->termios.c_cflag = B38400 | CS8 | CREAD | HUPCL | CLOCAL; 407 tty->termios.c_ispeed = 38400; 408 tty->termios.c_ospeed = 38400; 409 } 410 411 static void oti6858_set_termios(struct tty_struct *tty, 412 struct usb_serial_port *port, struct ktermios *old_termios) 413 { 414 struct oti6858_private *priv = usb_get_serial_port_data(port); 415 unsigned long flags; 416 unsigned int cflag; 417 u8 frame_fmt, control; 418 __le16 divisor; 419 int br; 420 421 if (!tty) 422 return; 423 424 cflag = tty->termios.c_cflag; 425 426 spin_lock_irqsave(&priv->lock, flags); 427 divisor = priv->pending_setup.divisor; 428 frame_fmt = priv->pending_setup.frame_fmt; 429 control = priv->pending_setup.control; 430 spin_unlock_irqrestore(&priv->lock, flags); 431 432 frame_fmt &= ~FMT_DATA_BITS_MASK; 433 switch (cflag & CSIZE) { 434 case CS5: 435 frame_fmt |= FMT_DATA_BITS_5; 436 break; 437 case CS6: 438 frame_fmt |= FMT_DATA_BITS_6; 439 break; 440 case CS7: 441 frame_fmt |= FMT_DATA_BITS_7; 442 break; 443 default: 444 case CS8: 445 frame_fmt |= FMT_DATA_BITS_8; 446 break; 447 } 448 449 /* manufacturer claims that this device can work with baud rates 450 * up to 3 Mbps; I've tested it only on 115200 bps, so I can't 451 * guarantee that any other baud rate will work (especially 452 * the higher ones) 453 */ 454 br = tty_get_baud_rate(tty); 455 if (br == 0) { 456 divisor = 0; 457 } else { 458 int real_br; 459 int new_divisor; 460 br = min(br, OTI6858_MAX_BAUD_RATE); 461 462 new_divisor = (96000000 + 8 * br) / (16 * br); 463 real_br = 96000000 / (16 * new_divisor); 464 divisor = cpu_to_le16(new_divisor); 465 tty_encode_baud_rate(tty, real_br, real_br); 466 } 467 468 frame_fmt &= ~FMT_STOP_BITS_MASK; 469 if ((cflag & CSTOPB) != 0) 470 frame_fmt |= FMT_STOP_BITS_2; 471 else 472 frame_fmt |= FMT_STOP_BITS_1; 473 474 frame_fmt &= ~FMT_PARITY_MASK; 475 if ((cflag & PARENB) != 0) { 476 if ((cflag & PARODD) != 0) 477 frame_fmt |= FMT_PARITY_ODD; 478 else 479 frame_fmt |= FMT_PARITY_EVEN; 480 } else { 481 frame_fmt |= FMT_PARITY_NONE; 482 } 483 484 control &= ~CONTROL_MASK; 485 if ((cflag & CRTSCTS) != 0) 486 control |= (CONTROL_DTR_HIGH | CONTROL_RTS_HIGH); 487 488 /* change control lines if we are switching to or from B0 */ 489 /* FIXME: 490 spin_lock_irqsave(&priv->lock, flags); 491 control = priv->line_control; 492 if ((cflag & CBAUD) == B0) 493 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS); 494 else 495 priv->line_control |= (CONTROL_DTR | CONTROL_RTS); 496 if (control != priv->line_control) { 497 control = priv->line_control; 498 spin_unlock_irqrestore(&priv->lock, flags); 499 set_control_lines(serial->dev, control); 500 } else { 501 spin_unlock_irqrestore(&priv->lock, flags); 502 } 503 */ 504 505 spin_lock_irqsave(&priv->lock, flags); 506 if (divisor != priv->pending_setup.divisor 507 || control != priv->pending_setup.control 508 || frame_fmt != priv->pending_setup.frame_fmt) { 509 priv->pending_setup.divisor = divisor; 510 priv->pending_setup.control = control; 511 priv->pending_setup.frame_fmt = frame_fmt; 512 } 513 spin_unlock_irqrestore(&priv->lock, flags); 514 } 515 516 static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port) 517 { 518 struct oti6858_private *priv = usb_get_serial_port_data(port); 519 struct ktermios tmp_termios; 520 struct usb_serial *serial = port->serial; 521 struct oti6858_control_pkt *buf; 522 unsigned long flags; 523 int result; 524 525 usb_clear_halt(serial->dev, port->write_urb->pipe); 526 usb_clear_halt(serial->dev, port->read_urb->pipe); 527 528 buf = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL); 529 if (buf == NULL) { 530 dev_err(&port->dev, "%s(): out of memory!\n", __func__); 531 return -ENOMEM; 532 } 533 534 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 535 OTI6858_REQ_T_GET_STATUS, 536 OTI6858_REQ_GET_STATUS, 537 0, 0, 538 buf, OTI6858_CTRL_PKT_SIZE, 539 100); 540 if (result != OTI6858_CTRL_PKT_SIZE) { 541 /* assume default (after power-on reset) values */ 542 buf->divisor = cpu_to_le16(0x009c); /* 38400 bps */ 543 buf->frame_fmt = 0x03; /* 8N1 */ 544 buf->something = 0x43; 545 buf->control = 0x4c; /* DTR, RTS */ 546 buf->tx_status = 0x00; 547 buf->pin_state = 0x5b; /* RTS, CTS, DSR, DTR, RI, DCD */ 548 buf->rx_bytes_avail = 0x00; 549 } 550 551 spin_lock_irqsave(&priv->lock, flags); 552 memcpy(&priv->status, buf, OTI6858_CTRL_PKT_SIZE); 553 priv->pending_setup.divisor = buf->divisor; 554 priv->pending_setup.frame_fmt = buf->frame_fmt; 555 priv->pending_setup.control = buf->control; 556 spin_unlock_irqrestore(&priv->lock, flags); 557 kfree(buf); 558 559 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__); 560 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); 561 if (result != 0) { 562 dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n", 563 __func__, result); 564 oti6858_close(port); 565 return result; 566 } 567 568 /* setup termios */ 569 if (tty) 570 oti6858_set_termios(tty, port, &tmp_termios); 571 port->port.drain_delay = 256; /* FIXME: check the FIFO length */ 572 return 0; 573 } 574 575 static void oti6858_close(struct usb_serial_port *port) 576 { 577 struct oti6858_private *priv = usb_get_serial_port_data(port); 578 unsigned long flags; 579 580 spin_lock_irqsave(&port->lock, flags); 581 /* clear out any remaining data in the buffer */ 582 kfifo_reset_out(&port->write_fifo); 583 spin_unlock_irqrestore(&port->lock, flags); 584 585 dev_dbg(&port->dev, "%s(): after buf_clear()\n", __func__); 586 587 /* cancel scheduled setup */ 588 cancel_delayed_work_sync(&priv->delayed_setup_work); 589 cancel_delayed_work_sync(&priv->delayed_write_work); 590 591 /* shutdown our urbs */ 592 dev_dbg(&port->dev, "%s(): shutting down urbs\n", __func__); 593 usb_kill_urb(port->write_urb); 594 usb_kill_urb(port->read_urb); 595 usb_kill_urb(port->interrupt_in_urb); 596 } 597 598 static int oti6858_tiocmset(struct tty_struct *tty, 599 unsigned int set, unsigned int clear) 600 { 601 struct usb_serial_port *port = tty->driver_data; 602 struct oti6858_private *priv = usb_get_serial_port_data(port); 603 unsigned long flags; 604 u8 control; 605 606 dev_dbg(&port->dev, "%s(set = 0x%08x, clear = 0x%08x)\n", 607 __func__, set, clear); 608 609 /* FIXME: check if this is correct (active high/low) */ 610 spin_lock_irqsave(&priv->lock, flags); 611 control = priv->pending_setup.control; 612 if ((set & TIOCM_RTS) != 0) 613 control |= CONTROL_RTS_HIGH; 614 if ((set & TIOCM_DTR) != 0) 615 control |= CONTROL_DTR_HIGH; 616 if ((clear & TIOCM_RTS) != 0) 617 control &= ~CONTROL_RTS_HIGH; 618 if ((clear & TIOCM_DTR) != 0) 619 control &= ~CONTROL_DTR_HIGH; 620 621 if (control != priv->pending_setup.control) 622 priv->pending_setup.control = control; 623 624 spin_unlock_irqrestore(&priv->lock, flags); 625 return 0; 626 } 627 628 static int oti6858_tiocmget(struct tty_struct *tty) 629 { 630 struct usb_serial_port *port = tty->driver_data; 631 struct oti6858_private *priv = usb_get_serial_port_data(port); 632 unsigned long flags; 633 unsigned pin_state; 634 unsigned result = 0; 635 636 spin_lock_irqsave(&priv->lock, flags); 637 pin_state = priv->status.pin_state & PIN_MASK; 638 spin_unlock_irqrestore(&priv->lock, flags); 639 640 /* FIXME: check if this is correct (active high/low) */ 641 if ((pin_state & PIN_RTS) != 0) 642 result |= TIOCM_RTS; 643 if ((pin_state & PIN_CTS) != 0) 644 result |= TIOCM_CTS; 645 if ((pin_state & PIN_DSR) != 0) 646 result |= TIOCM_DSR; 647 if ((pin_state & PIN_DTR) != 0) 648 result |= TIOCM_DTR; 649 if ((pin_state & PIN_RI) != 0) 650 result |= TIOCM_RI; 651 if ((pin_state & PIN_DCD) != 0) 652 result |= TIOCM_CD; 653 654 dev_dbg(&port->dev, "%s() = 0x%08x\n", __func__, result); 655 656 return result; 657 } 658 659 static int wait_modem_info(struct usb_serial_port *port, unsigned int arg) 660 { 661 struct oti6858_private *priv = usb_get_serial_port_data(port); 662 unsigned long flags; 663 unsigned int prev, status; 664 unsigned int changed; 665 666 spin_lock_irqsave(&priv->lock, flags); 667 prev = priv->status.pin_state; 668 spin_unlock_irqrestore(&priv->lock, flags); 669 670 while (1) { 671 wait_event_interruptible(priv->intr_wait, 672 priv->status.pin_state != prev); 673 if (signal_pending(current)) 674 return -ERESTARTSYS; 675 676 spin_lock_irqsave(&priv->lock, flags); 677 status = priv->status.pin_state & PIN_MASK; 678 spin_unlock_irqrestore(&priv->lock, flags); 679 680 changed = prev ^ status; 681 /* FIXME: check if this is correct (active high/low) */ 682 if (((arg & TIOCM_RNG) && (changed & PIN_RI)) || 683 ((arg & TIOCM_DSR) && (changed & PIN_DSR)) || 684 ((arg & TIOCM_CD) && (changed & PIN_DCD)) || 685 ((arg & TIOCM_CTS) && (changed & PIN_CTS))) 686 return 0; 687 prev = status; 688 } 689 690 /* NOTREACHED */ 691 return 0; 692 } 693 694 static int oti6858_ioctl(struct tty_struct *tty, 695 unsigned int cmd, unsigned long arg) 696 { 697 struct usb_serial_port *port = tty->driver_data; 698 699 dev_dbg(&port->dev, "%s(cmd = 0x%04x, arg = 0x%08lx)\n", __func__, cmd, arg); 700 701 switch (cmd) { 702 case TIOCMIWAIT: 703 dev_dbg(&port->dev, "%s(): TIOCMIWAIT\n", __func__); 704 return wait_modem_info(port, arg); 705 default: 706 dev_dbg(&port->dev, "%s(): 0x%04x not supported\n", __func__, cmd); 707 break; 708 } 709 return -ENOIOCTLCMD; 710 } 711 712 713 static void oti6858_release(struct usb_serial *serial) 714 { 715 int i; 716 717 for (i = 0; i < serial->num_ports; ++i) 718 kfree(usb_get_serial_port_data(serial->port[i])); 719 } 720 721 static void oti6858_read_int_callback(struct urb *urb) 722 { 723 struct usb_serial_port *port = urb->context; 724 struct oti6858_private *priv = usb_get_serial_port_data(port); 725 int transient = 0, can_recv = 0, resubmit = 1; 726 int status = urb->status; 727 728 switch (status) { 729 case 0: 730 /* success */ 731 break; 732 case -ECONNRESET: 733 case -ENOENT: 734 case -ESHUTDOWN: 735 /* this urb is terminated, clean up */ 736 dev_dbg(&urb->dev->dev, "%s(): urb shutting down with status: %d\n", 737 __func__, status); 738 return; 739 default: 740 dev_dbg(&urb->dev->dev, "%s(): nonzero urb status received: %d\n", 741 __func__, status); 742 break; 743 } 744 745 if (status == 0 && urb->actual_length == OTI6858_CTRL_PKT_SIZE) { 746 struct oti6858_control_pkt *xs = urb->transfer_buffer; 747 unsigned long flags; 748 749 spin_lock_irqsave(&priv->lock, flags); 750 751 if (!priv->transient) { 752 if (!OTI6858_CTRL_EQUALS_PENDING(xs, priv)) { 753 if (xs->rx_bytes_avail == 0) { 754 priv->transient = 4; 755 priv->setup_done = 0; 756 resubmit = 0; 757 dev_dbg(&port->dev, "%s(): scheduling setup_line()\n", __func__); 758 schedule_delayed_work(&priv->delayed_setup_work, 0); 759 } 760 } 761 } else { 762 if (OTI6858_CTRL_EQUALS_PENDING(xs, priv)) { 763 priv->transient = 0; 764 } else if (!priv->setup_done) { 765 resubmit = 0; 766 } else if (--priv->transient == 0) { 767 if (xs->rx_bytes_avail == 0) { 768 priv->transient = 4; 769 priv->setup_done = 0; 770 resubmit = 0; 771 dev_dbg(&port->dev, "%s(): scheduling setup_line()\n", __func__); 772 schedule_delayed_work(&priv->delayed_setup_work, 0); 773 } 774 } 775 } 776 777 if (!priv->transient) { 778 if (xs->pin_state != priv->status.pin_state) 779 wake_up_interruptible(&priv->intr_wait); 780 memcpy(&priv->status, xs, OTI6858_CTRL_PKT_SIZE); 781 } 782 783 if (!priv->transient && xs->rx_bytes_avail != 0) { 784 can_recv = xs->rx_bytes_avail; 785 priv->flags.read_urb_in_use = 1; 786 } 787 788 transient = priv->transient; 789 spin_unlock_irqrestore(&priv->lock, flags); 790 } 791 792 if (can_recv) { 793 int result; 794 795 result = usb_submit_urb(port->read_urb, GFP_ATOMIC); 796 if (result != 0) { 797 priv->flags.read_urb_in_use = 0; 798 dev_err(&port->dev, "%s(): usb_submit_urb() failed," 799 " error %d\n", __func__, result); 800 } else { 801 resubmit = 0; 802 } 803 } else if (!transient) { 804 unsigned long flags; 805 int count; 806 807 spin_lock_irqsave(&port->lock, flags); 808 count = kfifo_len(&port->write_fifo); 809 spin_unlock_irqrestore(&port->lock, flags); 810 811 spin_lock_irqsave(&priv->lock, flags); 812 if (priv->flags.write_urb_in_use == 0 && count != 0) { 813 schedule_delayed_work(&priv->delayed_write_work, 0); 814 resubmit = 0; 815 } 816 spin_unlock_irqrestore(&priv->lock, flags); 817 } 818 819 if (resubmit) { 820 int result; 821 822 /* dev_dbg(&urb->dev->dev, "%s(): submitting interrupt urb\n", __func__); */ 823 result = usb_submit_urb(urb, GFP_ATOMIC); 824 if (result != 0) { 825 dev_err(&urb->dev->dev, 826 "%s(): usb_submit_urb() failed with" 827 " error %d\n", __func__, result); 828 } 829 } 830 } 831 832 static void oti6858_read_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 struct tty_struct *tty; 837 unsigned char *data = urb->transfer_buffer; 838 unsigned long flags; 839 int status = urb->status; 840 int result; 841 842 spin_lock_irqsave(&priv->lock, flags); 843 priv->flags.read_urb_in_use = 0; 844 spin_unlock_irqrestore(&priv->lock, flags); 845 846 if (status != 0) { 847 dev_dbg(&urb->dev->dev, "%s(): unable to handle the error, exiting\n", __func__); 848 return; 849 } 850 851 tty = tty_port_tty_get(&port->port); 852 if (tty != NULL && urb->actual_length > 0) { 853 tty_insert_flip_string(tty, data, urb->actual_length); 854 tty_flip_buffer_push(tty); 855 } 856 tty_kref_put(tty); 857 858 /* schedule the interrupt urb */ 859 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC); 860 if (result != 0 && result != -EPERM) { 861 dev_err(&port->dev, "%s(): usb_submit_urb() failed," 862 " error %d\n", __func__, result); 863 } 864 } 865 866 static void oti6858_write_bulk_callback(struct urb *urb) 867 { 868 struct usb_serial_port *port = urb->context; 869 struct oti6858_private *priv = usb_get_serial_port_data(port); 870 int status = urb->status; 871 int result; 872 873 switch (status) { 874 case 0: 875 /* success */ 876 break; 877 case -ECONNRESET: 878 case -ENOENT: 879 case -ESHUTDOWN: 880 /* this urb is terminated, clean up */ 881 dev_dbg(&urb->dev->dev, "%s(): urb shutting down with status: %d\n", __func__, status); 882 priv->flags.write_urb_in_use = 0; 883 return; 884 default: 885 /* error in the urb, so we have to resubmit it */ 886 dev_dbg(&urb->dev->dev, "%s(): nonzero write bulk status received: %d\n", __func__, status); 887 dev_dbg(&urb->dev->dev, "%s(): overflow in write\n", __func__); 888 889 port->write_urb->transfer_buffer_length = 1; 890 result = usb_submit_urb(port->write_urb, GFP_ATOMIC); 891 if (result) { 892 dev_err_console(port, "%s(): usb_submit_urb() failed," 893 " error %d\n", __func__, result); 894 } else { 895 return; 896 } 897 } 898 899 priv->flags.write_urb_in_use = 0; 900 901 /* schedule the interrupt urb if we are still open */ 902 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__); 903 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC); 904 if (result != 0) { 905 dev_err(&port->dev, "%s(): failed submitting int urb," 906 " error %d\n", __func__, result); 907 } 908 } 909 910 module_usb_serial_driver(serial_drivers, id_table); 911 912 MODULE_DESCRIPTION(OTI6858_DESCRIPTION); 913 MODULE_AUTHOR(OTI6858_AUTHOR); 914 MODULE_VERSION(OTI6858_VERSION); 915 MODULE_LICENSE("GPL"); 916