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 .probe = usb_serial_probe, 72 .disconnect = usb_serial_disconnect, 73 .id_table = id_table, 74 }; 75 76 static bool debug; 77 78 /* requests */ 79 #define OTI6858_REQ_GET_STATUS (USB_DIR_IN | USB_TYPE_VENDOR | 0x00) 80 #define OTI6858_REQ_T_GET_STATUS 0x01 81 82 #define OTI6858_REQ_SET_LINE (USB_DIR_OUT | USB_TYPE_VENDOR | 0x00) 83 #define OTI6858_REQ_T_SET_LINE 0x00 84 85 #define OTI6858_REQ_CHECK_TXBUFF (USB_DIR_IN | USB_TYPE_VENDOR | 0x01) 86 #define OTI6858_REQ_T_CHECK_TXBUFF 0x00 87 88 /* format of the control packet */ 89 struct oti6858_control_pkt { 90 __le16 divisor; /* baud rate = 96000000 / (16 * divisor), LE */ 91 #define OTI6858_MAX_BAUD_RATE 3000000 92 u8 frame_fmt; 93 #define FMT_STOP_BITS_MASK 0xc0 94 #define FMT_STOP_BITS_1 0x00 95 #define FMT_STOP_BITS_2 0x40 /* 1.5 stop bits if FMT_DATA_BITS_5 */ 96 #define FMT_PARITY_MASK 0x38 97 #define FMT_PARITY_NONE 0x00 98 #define FMT_PARITY_ODD 0x08 99 #define FMT_PARITY_EVEN 0x18 100 #define FMT_PARITY_MARK 0x28 101 #define FMT_PARITY_SPACE 0x38 102 #define FMT_DATA_BITS_MASK 0x03 103 #define FMT_DATA_BITS_5 0x00 104 #define FMT_DATA_BITS_6 0x01 105 #define FMT_DATA_BITS_7 0x02 106 #define FMT_DATA_BITS_8 0x03 107 u8 something; /* always equals 0x43 */ 108 u8 control; /* settings of flow control lines */ 109 #define CONTROL_MASK 0x0c 110 #define CONTROL_DTR_HIGH 0x08 111 #define CONTROL_RTS_HIGH 0x04 112 u8 tx_status; 113 #define TX_BUFFER_EMPTIED 0x09 114 u8 pin_state; 115 #define PIN_MASK 0x3f 116 #define PIN_RTS 0x20 /* output pin */ 117 #define PIN_CTS 0x10 /* input pin, active low */ 118 #define PIN_DSR 0x08 /* input pin, active low */ 119 #define PIN_DTR 0x04 /* output pin */ 120 #define PIN_RI 0x02 /* input pin, active low */ 121 #define PIN_DCD 0x01 /* input pin, active low */ 122 u8 rx_bytes_avail; /* number of bytes in rx buffer */; 123 }; 124 125 #define OTI6858_CTRL_PKT_SIZE sizeof(struct oti6858_control_pkt) 126 #define OTI6858_CTRL_EQUALS_PENDING(a, priv) \ 127 (((a)->divisor == (priv)->pending_setup.divisor) \ 128 && ((a)->control == (priv)->pending_setup.control) \ 129 && ((a)->frame_fmt == (priv)->pending_setup.frame_fmt)) 130 131 /* function prototypes */ 132 static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port); 133 static void oti6858_close(struct usb_serial_port *port); 134 static void oti6858_set_termios(struct tty_struct *tty, 135 struct usb_serial_port *port, struct ktermios *old); 136 static void oti6858_init_termios(struct tty_struct *tty); 137 static int oti6858_ioctl(struct tty_struct *tty, 138 unsigned int cmd, unsigned long arg); 139 static void oti6858_read_int_callback(struct urb *urb); 140 static void oti6858_read_bulk_callback(struct urb *urb); 141 static void oti6858_write_bulk_callback(struct urb *urb); 142 static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port, 143 const unsigned char *buf, int count); 144 static int oti6858_write_room(struct tty_struct *tty); 145 static int oti6858_chars_in_buffer(struct tty_struct *tty); 146 static int oti6858_tiocmget(struct tty_struct *tty); 147 static int oti6858_tiocmset(struct tty_struct *tty, 148 unsigned int set, unsigned int clear); 149 static int oti6858_startup(struct usb_serial *serial); 150 static void oti6858_release(struct usb_serial *serial); 151 152 /* device info */ 153 static struct usb_serial_driver oti6858_device = { 154 .driver = { 155 .owner = THIS_MODULE, 156 .name = "oti6858", 157 }, 158 .id_table = id_table, 159 .num_ports = 1, 160 .open = oti6858_open, 161 .close = oti6858_close, 162 .write = oti6858_write, 163 .ioctl = oti6858_ioctl, 164 .set_termios = oti6858_set_termios, 165 .init_termios = oti6858_init_termios, 166 .tiocmget = oti6858_tiocmget, 167 .tiocmset = oti6858_tiocmset, 168 .read_bulk_callback = oti6858_read_bulk_callback, 169 .read_int_callback = oti6858_read_int_callback, 170 .write_bulk_callback = oti6858_write_bulk_callback, 171 .write_room = oti6858_write_room, 172 .chars_in_buffer = oti6858_chars_in_buffer, 173 .attach = oti6858_startup, 174 .release = oti6858_release, 175 }; 176 177 static struct usb_serial_driver * const serial_drivers[] = { 178 &oti6858_device, NULL 179 }; 180 181 struct oti6858_private { 182 spinlock_t lock; 183 184 struct oti6858_control_pkt status; 185 186 struct { 187 u8 read_urb_in_use; 188 u8 write_urb_in_use; 189 } flags; 190 struct delayed_work delayed_write_work; 191 192 struct { 193 __le16 divisor; 194 u8 frame_fmt; 195 u8 control; 196 } pending_setup; 197 u8 transient; 198 u8 setup_done; 199 struct delayed_work delayed_setup_work; 200 201 wait_queue_head_t intr_wait; 202 struct usb_serial_port *port; /* USB port with which associated */ 203 }; 204 205 static void setup_line(struct work_struct *work) 206 { 207 struct oti6858_private *priv = container_of(work, 208 struct oti6858_private, delayed_setup_work.work); 209 struct usb_serial_port *port = priv->port; 210 struct oti6858_control_pkt *new_setup; 211 unsigned long flags; 212 int result; 213 214 dbg("%s(port = %d)", __func__, port->number); 215 216 new_setup = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL); 217 if (new_setup == NULL) { 218 dev_err(&port->dev, "%s(): out of memory!\n", __func__); 219 /* we will try again */ 220 schedule_delayed_work(&priv->delayed_setup_work, 221 msecs_to_jiffies(2)); 222 return; 223 } 224 225 result = usb_control_msg(port->serial->dev, 226 usb_rcvctrlpipe(port->serial->dev, 0), 227 OTI6858_REQ_T_GET_STATUS, 228 OTI6858_REQ_GET_STATUS, 229 0, 0, 230 new_setup, OTI6858_CTRL_PKT_SIZE, 231 100); 232 233 if (result != OTI6858_CTRL_PKT_SIZE) { 234 dev_err(&port->dev, "%s(): error reading status\n", __func__); 235 kfree(new_setup); 236 /* we will try again */ 237 schedule_delayed_work(&priv->delayed_setup_work, 238 msecs_to_jiffies(2)); 239 return; 240 } 241 242 spin_lock_irqsave(&priv->lock, flags); 243 if (!OTI6858_CTRL_EQUALS_PENDING(new_setup, priv)) { 244 new_setup->divisor = priv->pending_setup.divisor; 245 new_setup->control = priv->pending_setup.control; 246 new_setup->frame_fmt = priv->pending_setup.frame_fmt; 247 248 spin_unlock_irqrestore(&priv->lock, flags); 249 result = usb_control_msg(port->serial->dev, 250 usb_sndctrlpipe(port->serial->dev, 0), 251 OTI6858_REQ_T_SET_LINE, 252 OTI6858_REQ_SET_LINE, 253 0, 0, 254 new_setup, OTI6858_CTRL_PKT_SIZE, 255 100); 256 } else { 257 spin_unlock_irqrestore(&priv->lock, flags); 258 result = 0; 259 } 260 kfree(new_setup); 261 262 spin_lock_irqsave(&priv->lock, flags); 263 if (result != OTI6858_CTRL_PKT_SIZE) 264 priv->transient = 0; 265 priv->setup_done = 1; 266 spin_unlock_irqrestore(&priv->lock, flags); 267 268 dbg("%s(): submitting interrupt urb", __func__); 269 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); 270 if (result != 0) { 271 dev_err(&port->dev, "%s(): usb_submit_urb() failed" 272 " with error %d\n", __func__, result); 273 } 274 } 275 276 static void send_data(struct work_struct *work) 277 { 278 struct oti6858_private *priv = container_of(work, 279 struct oti6858_private, delayed_write_work.work); 280 struct usb_serial_port *port = priv->port; 281 int count = 0, result; 282 unsigned long flags; 283 u8 *allow; 284 285 dbg("%s(port = %d)", __func__, port->number); 286 287 spin_lock_irqsave(&priv->lock, flags); 288 if (priv->flags.write_urb_in_use) { 289 spin_unlock_irqrestore(&priv->lock, flags); 290 schedule_delayed_work(&priv->delayed_write_work, 291 msecs_to_jiffies(2)); 292 return; 293 } 294 priv->flags.write_urb_in_use = 1; 295 spin_unlock_irqrestore(&priv->lock, flags); 296 297 spin_lock_irqsave(&port->lock, flags); 298 count = kfifo_len(&port->write_fifo); 299 spin_unlock_irqrestore(&port->lock, flags); 300 301 if (count > port->bulk_out_size) 302 count = port->bulk_out_size; 303 304 if (count != 0) { 305 allow = kmalloc(1, GFP_KERNEL); 306 if (!allow) { 307 dev_err_console(port, "%s(): kmalloc failed\n", 308 __func__); 309 return; 310 } 311 result = usb_control_msg(port->serial->dev, 312 usb_rcvctrlpipe(port->serial->dev, 0), 313 OTI6858_REQ_T_CHECK_TXBUFF, 314 OTI6858_REQ_CHECK_TXBUFF, 315 count, 0, allow, 1, 100); 316 if (result != 1 || *allow != 0) 317 count = 0; 318 kfree(allow); 319 } 320 321 if (count == 0) { 322 priv->flags.write_urb_in_use = 0; 323 324 dbg("%s(): submitting interrupt urb", __func__); 325 result = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO); 326 if (result != 0) { 327 dev_err(&port->dev, "%s(): usb_submit_urb() failed" 328 " with error %d\n", __func__, result); 329 } 330 return; 331 } 332 333 count = kfifo_out_locked(&port->write_fifo, 334 port->write_urb->transfer_buffer, 335 count, &port->lock); 336 port->write_urb->transfer_buffer_length = count; 337 result = usb_submit_urb(port->write_urb, GFP_NOIO); 338 if (result != 0) { 339 dev_err_console(port, "%s(): usb_submit_urb() failed" 340 " with error %d\n", __func__, result); 341 priv->flags.write_urb_in_use = 0; 342 } 343 344 usb_serial_port_softint(port); 345 } 346 347 static int oti6858_startup(struct usb_serial *serial) 348 { 349 struct usb_serial_port *port = serial->port[0]; 350 struct oti6858_private *priv; 351 int i; 352 353 for (i = 0; i < serial->num_ports; ++i) { 354 priv = kzalloc(sizeof(struct oti6858_private), GFP_KERNEL); 355 if (!priv) 356 break; 357 358 spin_lock_init(&priv->lock); 359 init_waitqueue_head(&priv->intr_wait); 360 /* INIT_WORK(&priv->setup_work, setup_line, serial->port[i]); */ 361 /* INIT_WORK(&priv->write_work, send_data, serial->port[i]); */ 362 priv->port = port; 363 INIT_DELAYED_WORK(&priv->delayed_setup_work, setup_line); 364 INIT_DELAYED_WORK(&priv->delayed_write_work, send_data); 365 366 usb_set_serial_port_data(serial->port[i], priv); 367 } 368 if (i == serial->num_ports) 369 return 0; 370 371 for (--i; i >= 0; --i) { 372 priv = usb_get_serial_port_data(serial->port[i]); 373 kfree(priv); 374 usb_set_serial_port_data(serial->port[i], NULL); 375 } 376 return -ENOMEM; 377 } 378 379 static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port, 380 const unsigned char *buf, int count) 381 { 382 dbg("%s(port = %d, count = %d)", __func__, port->number, count); 383 384 if (!count) 385 return count; 386 387 count = kfifo_in_locked(&port->write_fifo, buf, count, &port->lock); 388 389 return count; 390 } 391 392 static int oti6858_write_room(struct tty_struct *tty) 393 { 394 struct usb_serial_port *port = tty->driver_data; 395 int room = 0; 396 unsigned long flags; 397 398 dbg("%s(port = %d)", __func__, port->number); 399 400 spin_lock_irqsave(&port->lock, flags); 401 room = kfifo_avail(&port->write_fifo); 402 spin_unlock_irqrestore(&port->lock, flags); 403 404 return room; 405 } 406 407 static int oti6858_chars_in_buffer(struct tty_struct *tty) 408 { 409 struct usb_serial_port *port = tty->driver_data; 410 int chars = 0; 411 unsigned long flags; 412 413 dbg("%s(port = %d)", __func__, port->number); 414 415 spin_lock_irqsave(&port->lock, flags); 416 chars = kfifo_len(&port->write_fifo); 417 spin_unlock_irqrestore(&port->lock, flags); 418 419 return chars; 420 } 421 422 static void oti6858_init_termios(struct tty_struct *tty) 423 { 424 *(tty->termios) = tty_std_termios; 425 tty->termios->c_cflag = B38400 | CS8 | CREAD | HUPCL | CLOCAL; 426 tty->termios->c_ispeed = 38400; 427 tty->termios->c_ospeed = 38400; 428 } 429 430 static void oti6858_set_termios(struct tty_struct *tty, 431 struct usb_serial_port *port, struct ktermios *old_termios) 432 { 433 struct oti6858_private *priv = usb_get_serial_port_data(port); 434 unsigned long flags; 435 unsigned int cflag; 436 u8 frame_fmt, control; 437 __le16 divisor; 438 int br; 439 440 dbg("%s(port = %d)", __func__, port->number); 441 442 if (!tty) { 443 dbg("%s(): no tty structures", __func__); 444 return; 445 } 446 447 cflag = tty->termios->c_cflag; 448 449 spin_lock_irqsave(&priv->lock, flags); 450 divisor = priv->pending_setup.divisor; 451 frame_fmt = priv->pending_setup.frame_fmt; 452 control = priv->pending_setup.control; 453 spin_unlock_irqrestore(&priv->lock, flags); 454 455 frame_fmt &= ~FMT_DATA_BITS_MASK; 456 switch (cflag & CSIZE) { 457 case CS5: 458 frame_fmt |= FMT_DATA_BITS_5; 459 break; 460 case CS6: 461 frame_fmt |= FMT_DATA_BITS_6; 462 break; 463 case CS7: 464 frame_fmt |= FMT_DATA_BITS_7; 465 break; 466 default: 467 case CS8: 468 frame_fmt |= FMT_DATA_BITS_8; 469 break; 470 } 471 472 /* manufacturer claims that this device can work with baud rates 473 * up to 3 Mbps; I've tested it only on 115200 bps, so I can't 474 * guarantee that any other baud rate will work (especially 475 * the higher ones) 476 */ 477 br = tty_get_baud_rate(tty); 478 if (br == 0) { 479 divisor = 0; 480 } else { 481 int real_br; 482 int new_divisor; 483 br = min(br, OTI6858_MAX_BAUD_RATE); 484 485 new_divisor = (96000000 + 8 * br) / (16 * br); 486 real_br = 96000000 / (16 * new_divisor); 487 divisor = cpu_to_le16(new_divisor); 488 tty_encode_baud_rate(tty, real_br, real_br); 489 } 490 491 frame_fmt &= ~FMT_STOP_BITS_MASK; 492 if ((cflag & CSTOPB) != 0) 493 frame_fmt |= FMT_STOP_BITS_2; 494 else 495 frame_fmt |= FMT_STOP_BITS_1; 496 497 frame_fmt &= ~FMT_PARITY_MASK; 498 if ((cflag & PARENB) != 0) { 499 if ((cflag & PARODD) != 0) 500 frame_fmt |= FMT_PARITY_ODD; 501 else 502 frame_fmt |= FMT_PARITY_EVEN; 503 } else { 504 frame_fmt |= FMT_PARITY_NONE; 505 } 506 507 control &= ~CONTROL_MASK; 508 if ((cflag & CRTSCTS) != 0) 509 control |= (CONTROL_DTR_HIGH | CONTROL_RTS_HIGH); 510 511 /* change control lines if we are switching to or from B0 */ 512 /* FIXME: 513 spin_lock_irqsave(&priv->lock, flags); 514 control = priv->line_control; 515 if ((cflag & CBAUD) == B0) 516 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS); 517 else 518 priv->line_control |= (CONTROL_DTR | CONTROL_RTS); 519 if (control != priv->line_control) { 520 control = priv->line_control; 521 spin_unlock_irqrestore(&priv->lock, flags); 522 set_control_lines(serial->dev, control); 523 } else { 524 spin_unlock_irqrestore(&priv->lock, flags); 525 } 526 */ 527 528 spin_lock_irqsave(&priv->lock, flags); 529 if (divisor != priv->pending_setup.divisor 530 || control != priv->pending_setup.control 531 || frame_fmt != priv->pending_setup.frame_fmt) { 532 priv->pending_setup.divisor = divisor; 533 priv->pending_setup.control = control; 534 priv->pending_setup.frame_fmt = frame_fmt; 535 } 536 spin_unlock_irqrestore(&priv->lock, flags); 537 } 538 539 static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port) 540 { 541 struct oti6858_private *priv = usb_get_serial_port_data(port); 542 struct ktermios tmp_termios; 543 struct usb_serial *serial = port->serial; 544 struct oti6858_control_pkt *buf; 545 unsigned long flags; 546 int result; 547 548 dbg("%s(port = %d)", __func__, port->number); 549 550 usb_clear_halt(serial->dev, port->write_urb->pipe); 551 usb_clear_halt(serial->dev, port->read_urb->pipe); 552 553 buf = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL); 554 if (buf == NULL) { 555 dev_err(&port->dev, "%s(): out of memory!\n", __func__); 556 return -ENOMEM; 557 } 558 559 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 560 OTI6858_REQ_T_GET_STATUS, 561 OTI6858_REQ_GET_STATUS, 562 0, 0, 563 buf, OTI6858_CTRL_PKT_SIZE, 564 100); 565 if (result != OTI6858_CTRL_PKT_SIZE) { 566 /* assume default (after power-on reset) values */ 567 buf->divisor = cpu_to_le16(0x009c); /* 38400 bps */ 568 buf->frame_fmt = 0x03; /* 8N1 */ 569 buf->something = 0x43; 570 buf->control = 0x4c; /* DTR, RTS */ 571 buf->tx_status = 0x00; 572 buf->pin_state = 0x5b; /* RTS, CTS, DSR, DTR, RI, DCD */ 573 buf->rx_bytes_avail = 0x00; 574 } 575 576 spin_lock_irqsave(&priv->lock, flags); 577 memcpy(&priv->status, buf, OTI6858_CTRL_PKT_SIZE); 578 priv->pending_setup.divisor = buf->divisor; 579 priv->pending_setup.frame_fmt = buf->frame_fmt; 580 priv->pending_setup.control = buf->control; 581 spin_unlock_irqrestore(&priv->lock, flags); 582 kfree(buf); 583 584 dbg("%s(): submitting interrupt urb", __func__); 585 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); 586 if (result != 0) { 587 dev_err(&port->dev, "%s(): usb_submit_urb() failed" 588 " with error %d\n", __func__, result); 589 oti6858_close(port); 590 return result; 591 } 592 593 /* setup termios */ 594 if (tty) 595 oti6858_set_termios(tty, port, &tmp_termios); 596 port->port.drain_delay = 256; /* FIXME: check the FIFO length */ 597 return 0; 598 } 599 600 static void oti6858_close(struct usb_serial_port *port) 601 { 602 struct oti6858_private *priv = usb_get_serial_port_data(port); 603 unsigned long flags; 604 605 dbg("%s(port = %d)", __func__, port->number); 606 607 spin_lock_irqsave(&port->lock, flags); 608 /* clear out any remaining data in the buffer */ 609 kfifo_reset_out(&port->write_fifo); 610 spin_unlock_irqrestore(&port->lock, flags); 611 612 dbg("%s(): after buf_clear()", __func__); 613 614 /* cancel scheduled setup */ 615 cancel_delayed_work_sync(&priv->delayed_setup_work); 616 cancel_delayed_work_sync(&priv->delayed_write_work); 617 618 /* shutdown our urbs */ 619 dbg("%s(): shutting down urbs", __func__); 620 usb_kill_urb(port->write_urb); 621 usb_kill_urb(port->read_urb); 622 usb_kill_urb(port->interrupt_in_urb); 623 } 624 625 static int oti6858_tiocmset(struct tty_struct *tty, 626 unsigned int set, unsigned int clear) 627 { 628 struct usb_serial_port *port = tty->driver_data; 629 struct oti6858_private *priv = usb_get_serial_port_data(port); 630 unsigned long flags; 631 u8 control; 632 633 dbg("%s(port = %d, set = 0x%08x, clear = 0x%08x)", 634 __func__, port->number, set, clear); 635 636 if (!usb_get_intfdata(port->serial->interface)) 637 return -ENODEV; 638 639 /* FIXME: check if this is correct (active high/low) */ 640 spin_lock_irqsave(&priv->lock, flags); 641 control = priv->pending_setup.control; 642 if ((set & TIOCM_RTS) != 0) 643 control |= CONTROL_RTS_HIGH; 644 if ((set & TIOCM_DTR) != 0) 645 control |= CONTROL_DTR_HIGH; 646 if ((clear & TIOCM_RTS) != 0) 647 control &= ~CONTROL_RTS_HIGH; 648 if ((clear & TIOCM_DTR) != 0) 649 control &= ~CONTROL_DTR_HIGH; 650 651 if (control != priv->pending_setup.control) 652 priv->pending_setup.control = control; 653 654 spin_unlock_irqrestore(&priv->lock, flags); 655 return 0; 656 } 657 658 static int oti6858_tiocmget(struct tty_struct *tty) 659 { 660 struct usb_serial_port *port = tty->driver_data; 661 struct oti6858_private *priv = usb_get_serial_port_data(port); 662 unsigned long flags; 663 unsigned pin_state; 664 unsigned result = 0; 665 666 dbg("%s(port = %d)", __func__, port->number); 667 668 if (!usb_get_intfdata(port->serial->interface)) 669 return -ENODEV; 670 671 spin_lock_irqsave(&priv->lock, flags); 672 pin_state = priv->status.pin_state & PIN_MASK; 673 spin_unlock_irqrestore(&priv->lock, flags); 674 675 /* FIXME: check if this is correct (active high/low) */ 676 if ((pin_state & PIN_RTS) != 0) 677 result |= TIOCM_RTS; 678 if ((pin_state & PIN_CTS) != 0) 679 result |= TIOCM_CTS; 680 if ((pin_state & PIN_DSR) != 0) 681 result |= TIOCM_DSR; 682 if ((pin_state & PIN_DTR) != 0) 683 result |= TIOCM_DTR; 684 if ((pin_state & PIN_RI) != 0) 685 result |= TIOCM_RI; 686 if ((pin_state & PIN_DCD) != 0) 687 result |= TIOCM_CD; 688 689 dbg("%s() = 0x%08x", __func__, result); 690 691 return result; 692 } 693 694 static int wait_modem_info(struct usb_serial_port *port, unsigned int arg) 695 { 696 struct oti6858_private *priv = usb_get_serial_port_data(port); 697 unsigned long flags; 698 unsigned int prev, status; 699 unsigned int changed; 700 701 spin_lock_irqsave(&priv->lock, flags); 702 prev = priv->status.pin_state; 703 spin_unlock_irqrestore(&priv->lock, flags); 704 705 while (1) { 706 wait_event_interruptible(priv->intr_wait, 707 priv->status.pin_state != prev); 708 if (signal_pending(current)) 709 return -ERESTARTSYS; 710 711 spin_lock_irqsave(&priv->lock, flags); 712 status = priv->status.pin_state & PIN_MASK; 713 spin_unlock_irqrestore(&priv->lock, flags); 714 715 changed = prev ^ status; 716 /* FIXME: check if this is correct (active high/low) */ 717 if (((arg & TIOCM_RNG) && (changed & PIN_RI)) || 718 ((arg & TIOCM_DSR) && (changed & PIN_DSR)) || 719 ((arg & TIOCM_CD) && (changed & PIN_DCD)) || 720 ((arg & TIOCM_CTS) && (changed & PIN_CTS))) 721 return 0; 722 prev = status; 723 } 724 725 /* NOTREACHED */ 726 return 0; 727 } 728 729 static int oti6858_ioctl(struct tty_struct *tty, 730 unsigned int cmd, unsigned long arg) 731 { 732 struct usb_serial_port *port = tty->driver_data; 733 734 dbg("%s(port = %d, cmd = 0x%04x, arg = 0x%08lx)", 735 __func__, port->number, cmd, arg); 736 737 switch (cmd) { 738 case TIOCMIWAIT: 739 dbg("%s(): TIOCMIWAIT", __func__); 740 return wait_modem_info(port, arg); 741 default: 742 dbg("%s(): 0x%04x not supported", __func__, cmd); 743 break; 744 } 745 return -ENOIOCTLCMD; 746 } 747 748 749 static void oti6858_release(struct usb_serial *serial) 750 { 751 int i; 752 753 dbg("%s()", __func__); 754 755 for (i = 0; i < serial->num_ports; ++i) 756 kfree(usb_get_serial_port_data(serial->port[i])); 757 } 758 759 static void oti6858_read_int_callback(struct urb *urb) 760 { 761 struct usb_serial_port *port = urb->context; 762 struct oti6858_private *priv = usb_get_serial_port_data(port); 763 int transient = 0, can_recv = 0, resubmit = 1; 764 int status = urb->status; 765 766 dbg("%s(port = %d, status = %d)", 767 __func__, port->number, status); 768 769 switch (status) { 770 case 0: 771 /* success */ 772 break; 773 case -ECONNRESET: 774 case -ENOENT: 775 case -ESHUTDOWN: 776 /* this urb is terminated, clean up */ 777 dbg("%s(): urb shutting down with status: %d", 778 __func__, status); 779 return; 780 default: 781 dbg("%s(): nonzero urb status received: %d", 782 __func__, status); 783 break; 784 } 785 786 if (status == 0 && urb->actual_length == OTI6858_CTRL_PKT_SIZE) { 787 struct oti6858_control_pkt *xs = urb->transfer_buffer; 788 unsigned long flags; 789 790 spin_lock_irqsave(&priv->lock, flags); 791 792 if (!priv->transient) { 793 if (!OTI6858_CTRL_EQUALS_PENDING(xs, priv)) { 794 if (xs->rx_bytes_avail == 0) { 795 priv->transient = 4; 796 priv->setup_done = 0; 797 resubmit = 0; 798 dbg("%s(): scheduling setup_line()", 799 __func__); 800 schedule_delayed_work(&priv->delayed_setup_work, 0); 801 } 802 } 803 } else { 804 if (OTI6858_CTRL_EQUALS_PENDING(xs, priv)) { 805 priv->transient = 0; 806 } else if (!priv->setup_done) { 807 resubmit = 0; 808 } else if (--priv->transient == 0) { 809 if (xs->rx_bytes_avail == 0) { 810 priv->transient = 4; 811 priv->setup_done = 0; 812 resubmit = 0; 813 dbg("%s(): scheduling setup_line()", 814 __func__); 815 schedule_delayed_work(&priv->delayed_setup_work, 0); 816 } 817 } 818 } 819 820 if (!priv->transient) { 821 if (xs->pin_state != priv->status.pin_state) 822 wake_up_interruptible(&priv->intr_wait); 823 memcpy(&priv->status, xs, OTI6858_CTRL_PKT_SIZE); 824 } 825 826 if (!priv->transient && xs->rx_bytes_avail != 0) { 827 can_recv = xs->rx_bytes_avail; 828 priv->flags.read_urb_in_use = 1; 829 } 830 831 transient = priv->transient; 832 spin_unlock_irqrestore(&priv->lock, flags); 833 } 834 835 if (can_recv) { 836 int result; 837 838 result = usb_submit_urb(port->read_urb, GFP_ATOMIC); 839 if (result != 0) { 840 priv->flags.read_urb_in_use = 0; 841 dev_err(&port->dev, "%s(): usb_submit_urb() failed," 842 " error %d\n", __func__, result); 843 } else { 844 resubmit = 0; 845 } 846 } else if (!transient) { 847 unsigned long flags; 848 int count; 849 850 spin_lock_irqsave(&port->lock, flags); 851 count = kfifo_len(&port->write_fifo); 852 spin_unlock_irqrestore(&port->lock, flags); 853 854 spin_lock_irqsave(&priv->lock, flags); 855 if (priv->flags.write_urb_in_use == 0 && count != 0) { 856 schedule_delayed_work(&priv->delayed_write_work, 0); 857 resubmit = 0; 858 } 859 spin_unlock_irqrestore(&priv->lock, flags); 860 } 861 862 if (resubmit) { 863 int result; 864 865 /* dbg("%s(): submitting interrupt urb", __func__); */ 866 result = usb_submit_urb(urb, GFP_ATOMIC); 867 if (result != 0) { 868 dev_err(&urb->dev->dev, 869 "%s(): usb_submit_urb() failed with" 870 " error %d\n", __func__, result); 871 } 872 } 873 } 874 875 static void oti6858_read_bulk_callback(struct urb *urb) 876 { 877 struct usb_serial_port *port = urb->context; 878 struct oti6858_private *priv = usb_get_serial_port_data(port); 879 struct tty_struct *tty; 880 unsigned char *data = urb->transfer_buffer; 881 unsigned long flags; 882 int status = urb->status; 883 int result; 884 885 dbg("%s(port = %d, status = %d)", 886 __func__, port->number, status); 887 888 spin_lock_irqsave(&priv->lock, flags); 889 priv->flags.read_urb_in_use = 0; 890 spin_unlock_irqrestore(&priv->lock, flags); 891 892 if (status != 0) { 893 dbg("%s(): unable to handle the error, exiting", __func__); 894 return; 895 } 896 897 tty = tty_port_tty_get(&port->port); 898 if (tty != NULL && urb->actual_length > 0) { 899 tty_insert_flip_string(tty, data, urb->actual_length); 900 tty_flip_buffer_push(tty); 901 } 902 tty_kref_put(tty); 903 904 /* schedule the interrupt urb */ 905 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC); 906 if (result != 0 && result != -EPERM) { 907 dev_err(&port->dev, "%s(): usb_submit_urb() failed," 908 " error %d\n", __func__, result); 909 } 910 } 911 912 static void oti6858_write_bulk_callback(struct urb *urb) 913 { 914 struct usb_serial_port *port = urb->context; 915 struct oti6858_private *priv = usb_get_serial_port_data(port); 916 int status = urb->status; 917 int result; 918 919 dbg("%s(port = %d, status = %d)", 920 __func__, port->number, status); 921 922 switch (status) { 923 case 0: 924 /* success */ 925 break; 926 case -ECONNRESET: 927 case -ENOENT: 928 case -ESHUTDOWN: 929 /* this urb is terminated, clean up */ 930 dbg("%s(): urb shutting down with status: %d", 931 __func__, status); 932 priv->flags.write_urb_in_use = 0; 933 return; 934 default: 935 /* error in the urb, so we have to resubmit it */ 936 dbg("%s(): nonzero write bulk status received: %d", 937 __func__, status); 938 dbg("%s(): overflow in write", __func__); 939 940 port->write_urb->transfer_buffer_length = 1; 941 result = usb_submit_urb(port->write_urb, GFP_ATOMIC); 942 if (result) { 943 dev_err_console(port, "%s(): usb_submit_urb() failed," 944 " error %d\n", __func__, result); 945 } else { 946 return; 947 } 948 } 949 950 priv->flags.write_urb_in_use = 0; 951 952 /* schedule the interrupt urb if we are still open */ 953 dbg("%s(): submitting interrupt urb", __func__); 954 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC); 955 if (result != 0) { 956 dev_err(&port->dev, "%s(): failed submitting int urb," 957 " error %d\n", __func__, result); 958 } 959 } 960 961 module_usb_serial_driver(oti6858_driver, serial_drivers); 962 963 MODULE_DESCRIPTION(OTI6858_DESCRIPTION); 964 MODULE_AUTHOR(OTI6858_AUTHOR); 965 MODULE_VERSION(OTI6858_VERSION); 966 MODULE_LICENSE("GPL"); 967 968 module_param(debug, bool, S_IRUGO | S_IWUSR); 969 MODULE_PARM_DESC(debug, "enable debug output"); 970 971