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 61 static const struct usb_device_id id_table[] = { 62 { USB_DEVICE(OTI6858_VENDOR_ID, OTI6858_PRODUCT_ID) }, 63 { } 64 }; 65 66 MODULE_DEVICE_TABLE(usb, id_table); 67 68 /* requests */ 69 #define OTI6858_REQ_GET_STATUS (USB_DIR_IN | USB_TYPE_VENDOR | 0x00) 70 #define OTI6858_REQ_T_GET_STATUS 0x01 71 72 #define OTI6858_REQ_SET_LINE (USB_DIR_OUT | USB_TYPE_VENDOR | 0x00) 73 #define OTI6858_REQ_T_SET_LINE 0x00 74 75 #define OTI6858_REQ_CHECK_TXBUFF (USB_DIR_IN | USB_TYPE_VENDOR | 0x01) 76 #define OTI6858_REQ_T_CHECK_TXBUFF 0x00 77 78 /* format of the control packet */ 79 struct oti6858_control_pkt { 80 __le16 divisor; /* baud rate = 96000000 / (16 * divisor), LE */ 81 #define OTI6858_MAX_BAUD_RATE 3000000 82 u8 frame_fmt; 83 #define FMT_STOP_BITS_MASK 0xc0 84 #define FMT_STOP_BITS_1 0x00 85 #define FMT_STOP_BITS_2 0x40 /* 1.5 stop bits if FMT_DATA_BITS_5 */ 86 #define FMT_PARITY_MASK 0x38 87 #define FMT_PARITY_NONE 0x00 88 #define FMT_PARITY_ODD 0x08 89 #define FMT_PARITY_EVEN 0x18 90 #define FMT_PARITY_MARK 0x28 91 #define FMT_PARITY_SPACE 0x38 92 #define FMT_DATA_BITS_MASK 0x03 93 #define FMT_DATA_BITS_5 0x00 94 #define FMT_DATA_BITS_6 0x01 95 #define FMT_DATA_BITS_7 0x02 96 #define FMT_DATA_BITS_8 0x03 97 u8 something; /* always equals 0x43 */ 98 u8 control; /* settings of flow control lines */ 99 #define CONTROL_MASK 0x0c 100 #define CONTROL_DTR_HIGH 0x08 101 #define CONTROL_RTS_HIGH 0x04 102 u8 tx_status; 103 #define TX_BUFFER_EMPTIED 0x09 104 u8 pin_state; 105 #define PIN_MASK 0x3f 106 #define PIN_RTS 0x20 /* output pin */ 107 #define PIN_CTS 0x10 /* input pin, active low */ 108 #define PIN_DSR 0x08 /* input pin, active low */ 109 #define PIN_DTR 0x04 /* output pin */ 110 #define PIN_RI 0x02 /* input pin, active low */ 111 #define PIN_DCD 0x01 /* input pin, active low */ 112 u8 rx_bytes_avail; /* number of bytes in rx buffer */; 113 }; 114 115 #define OTI6858_CTRL_PKT_SIZE sizeof(struct oti6858_control_pkt) 116 #define OTI6858_CTRL_EQUALS_PENDING(a, priv) \ 117 (((a)->divisor == (priv)->pending_setup.divisor) \ 118 && ((a)->control == (priv)->pending_setup.control) \ 119 && ((a)->frame_fmt == (priv)->pending_setup.frame_fmt)) 120 121 /* function prototypes */ 122 static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port); 123 static void oti6858_close(struct usb_serial_port *port); 124 static void oti6858_set_termios(struct tty_struct *tty, 125 struct usb_serial_port *port, struct ktermios *old); 126 static void oti6858_init_termios(struct tty_struct *tty); 127 static int oti6858_ioctl(struct tty_struct *tty, 128 unsigned int cmd, unsigned long arg); 129 static void oti6858_read_int_callback(struct urb *urb); 130 static void oti6858_read_bulk_callback(struct urb *urb); 131 static void oti6858_write_bulk_callback(struct urb *urb); 132 static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port, 133 const unsigned char *buf, int count); 134 static int oti6858_write_room(struct tty_struct *tty); 135 static int oti6858_chars_in_buffer(struct tty_struct *tty); 136 static int oti6858_tiocmget(struct tty_struct *tty); 137 static int oti6858_tiocmset(struct tty_struct *tty, 138 unsigned int set, unsigned int clear); 139 static int oti6858_port_probe(struct usb_serial_port *port); 140 static int oti6858_port_remove(struct usb_serial_port *port); 141 142 /* device info */ 143 static struct usb_serial_driver oti6858_device = { 144 .driver = { 145 .owner = THIS_MODULE, 146 .name = "oti6858", 147 }, 148 .id_table = id_table, 149 .num_ports = 1, 150 .open = oti6858_open, 151 .close = oti6858_close, 152 .write = oti6858_write, 153 .ioctl = oti6858_ioctl, 154 .set_termios = oti6858_set_termios, 155 .init_termios = oti6858_init_termios, 156 .tiocmget = oti6858_tiocmget, 157 .tiocmset = oti6858_tiocmset, 158 .read_bulk_callback = oti6858_read_bulk_callback, 159 .read_int_callback = oti6858_read_int_callback, 160 .write_bulk_callback = oti6858_write_bulk_callback, 161 .write_room = oti6858_write_room, 162 .chars_in_buffer = oti6858_chars_in_buffer, 163 .port_probe = oti6858_port_probe, 164 .port_remove = oti6858_port_remove, 165 }; 166 167 static struct usb_serial_driver * const serial_drivers[] = { 168 &oti6858_device, NULL 169 }; 170 171 struct oti6858_private { 172 spinlock_t lock; 173 174 struct oti6858_control_pkt status; 175 176 struct { 177 u8 read_urb_in_use; 178 u8 write_urb_in_use; 179 } flags; 180 struct delayed_work delayed_write_work; 181 182 struct { 183 __le16 divisor; 184 u8 frame_fmt; 185 u8 control; 186 } pending_setup; 187 u8 transient; 188 u8 setup_done; 189 struct delayed_work delayed_setup_work; 190 191 wait_queue_head_t intr_wait; 192 struct usb_serial_port *port; /* USB port with which associated */ 193 }; 194 195 static void setup_line(struct work_struct *work) 196 { 197 struct oti6858_private *priv = container_of(work, 198 struct oti6858_private, delayed_setup_work.work); 199 struct usb_serial_port *port = priv->port; 200 struct oti6858_control_pkt *new_setup; 201 unsigned long flags; 202 int result; 203 204 new_setup = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL); 205 if (new_setup == NULL) { 206 dev_err(&port->dev, "%s(): out of memory!\n", __func__); 207 /* we will try again */ 208 schedule_delayed_work(&priv->delayed_setup_work, 209 msecs_to_jiffies(2)); 210 return; 211 } 212 213 result = usb_control_msg(port->serial->dev, 214 usb_rcvctrlpipe(port->serial->dev, 0), 215 OTI6858_REQ_T_GET_STATUS, 216 OTI6858_REQ_GET_STATUS, 217 0, 0, 218 new_setup, OTI6858_CTRL_PKT_SIZE, 219 100); 220 221 if (result != OTI6858_CTRL_PKT_SIZE) { 222 dev_err(&port->dev, "%s(): error reading status\n", __func__); 223 kfree(new_setup); 224 /* we will try again */ 225 schedule_delayed_work(&priv->delayed_setup_work, 226 msecs_to_jiffies(2)); 227 return; 228 } 229 230 spin_lock_irqsave(&priv->lock, flags); 231 if (!OTI6858_CTRL_EQUALS_PENDING(new_setup, priv)) { 232 new_setup->divisor = priv->pending_setup.divisor; 233 new_setup->control = priv->pending_setup.control; 234 new_setup->frame_fmt = priv->pending_setup.frame_fmt; 235 236 spin_unlock_irqrestore(&priv->lock, flags); 237 result = usb_control_msg(port->serial->dev, 238 usb_sndctrlpipe(port->serial->dev, 0), 239 OTI6858_REQ_T_SET_LINE, 240 OTI6858_REQ_SET_LINE, 241 0, 0, 242 new_setup, OTI6858_CTRL_PKT_SIZE, 243 100); 244 } else { 245 spin_unlock_irqrestore(&priv->lock, flags); 246 result = 0; 247 } 248 kfree(new_setup); 249 250 spin_lock_irqsave(&priv->lock, flags); 251 if (result != OTI6858_CTRL_PKT_SIZE) 252 priv->transient = 0; 253 priv->setup_done = 1; 254 spin_unlock_irqrestore(&priv->lock, flags); 255 256 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__); 257 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); 258 if (result != 0) { 259 dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n", 260 __func__, result); 261 } 262 } 263 264 static void send_data(struct work_struct *work) 265 { 266 struct oti6858_private *priv = container_of(work, 267 struct oti6858_private, delayed_write_work.work); 268 struct usb_serial_port *port = priv->port; 269 int count = 0, result; 270 unsigned long flags; 271 u8 *allow; 272 273 spin_lock_irqsave(&priv->lock, flags); 274 if (priv->flags.write_urb_in_use) { 275 spin_unlock_irqrestore(&priv->lock, flags); 276 schedule_delayed_work(&priv->delayed_write_work, 277 msecs_to_jiffies(2)); 278 return; 279 } 280 priv->flags.write_urb_in_use = 1; 281 spin_unlock_irqrestore(&priv->lock, flags); 282 283 spin_lock_irqsave(&port->lock, flags); 284 count = kfifo_len(&port->write_fifo); 285 spin_unlock_irqrestore(&port->lock, flags); 286 287 if (count > port->bulk_out_size) 288 count = port->bulk_out_size; 289 290 if (count != 0) { 291 allow = kmalloc(1, GFP_KERNEL); 292 if (!allow) { 293 dev_err_console(port, "%s(): kmalloc failed\n", 294 __func__); 295 return; 296 } 297 result = usb_control_msg(port->serial->dev, 298 usb_rcvctrlpipe(port->serial->dev, 0), 299 OTI6858_REQ_T_CHECK_TXBUFF, 300 OTI6858_REQ_CHECK_TXBUFF, 301 count, 0, allow, 1, 100); 302 if (result != 1 || *allow != 0) 303 count = 0; 304 kfree(allow); 305 } 306 307 if (count == 0) { 308 priv->flags.write_urb_in_use = 0; 309 310 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__); 311 result = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO); 312 if (result != 0) { 313 dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n", 314 __func__, result); 315 } 316 return; 317 } 318 319 count = kfifo_out_locked(&port->write_fifo, 320 port->write_urb->transfer_buffer, 321 count, &port->lock); 322 port->write_urb->transfer_buffer_length = count; 323 result = usb_submit_urb(port->write_urb, GFP_NOIO); 324 if (result != 0) { 325 dev_err_console(port, "%s(): usb_submit_urb() failed with error %d\n", 326 __func__, result); 327 priv->flags.write_urb_in_use = 0; 328 } 329 330 usb_serial_port_softint(port); 331 } 332 333 static int oti6858_port_probe(struct usb_serial_port *port) 334 { 335 struct oti6858_private *priv; 336 337 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 338 if (!priv) 339 return -ENOMEM; 340 341 spin_lock_init(&priv->lock); 342 init_waitqueue_head(&priv->intr_wait); 343 priv->port = port; 344 INIT_DELAYED_WORK(&priv->delayed_setup_work, setup_line); 345 INIT_DELAYED_WORK(&priv->delayed_write_work, send_data); 346 347 usb_set_serial_port_data(port, priv); 348 349 return 0; 350 } 351 352 static int oti6858_port_remove(struct usb_serial_port *port) 353 { 354 struct oti6858_private *priv; 355 356 priv = usb_get_serial_port_data(port); 357 kfree(priv); 358 359 return 0; 360 } 361 362 static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port, 363 const unsigned char *buf, int count) 364 { 365 if (!count) 366 return count; 367 368 count = kfifo_in_locked(&port->write_fifo, buf, count, &port->lock); 369 370 return count; 371 } 372 373 static int oti6858_write_room(struct tty_struct *tty) 374 { 375 struct usb_serial_port *port = tty->driver_data; 376 int room = 0; 377 unsigned long flags; 378 379 spin_lock_irqsave(&port->lock, flags); 380 room = kfifo_avail(&port->write_fifo); 381 spin_unlock_irqrestore(&port->lock, flags); 382 383 return room; 384 } 385 386 static int oti6858_chars_in_buffer(struct tty_struct *tty) 387 { 388 struct usb_serial_port *port = tty->driver_data; 389 int chars = 0; 390 unsigned long flags; 391 392 spin_lock_irqsave(&port->lock, flags); 393 chars = kfifo_len(&port->write_fifo); 394 spin_unlock_irqrestore(&port->lock, flags); 395 396 return chars; 397 } 398 399 static void oti6858_init_termios(struct tty_struct *tty) 400 { 401 tty->termios = tty_std_termios; 402 tty->termios.c_cflag = B38400 | CS8 | CREAD | HUPCL | CLOCAL; 403 tty->termios.c_ispeed = 38400; 404 tty->termios.c_ospeed = 38400; 405 } 406 407 static void oti6858_set_termios(struct tty_struct *tty, 408 struct usb_serial_port *port, struct ktermios *old_termios) 409 { 410 struct oti6858_private *priv = usb_get_serial_port_data(port); 411 unsigned long flags; 412 unsigned int cflag; 413 u8 frame_fmt, control; 414 __le16 divisor; 415 int br; 416 417 if (!tty) 418 return; 419 420 cflag = tty->termios.c_cflag; 421 422 spin_lock_irqsave(&priv->lock, flags); 423 divisor = priv->pending_setup.divisor; 424 frame_fmt = priv->pending_setup.frame_fmt; 425 control = priv->pending_setup.control; 426 spin_unlock_irqrestore(&priv->lock, flags); 427 428 frame_fmt &= ~FMT_DATA_BITS_MASK; 429 switch (cflag & CSIZE) { 430 case CS5: 431 frame_fmt |= FMT_DATA_BITS_5; 432 break; 433 case CS6: 434 frame_fmt |= FMT_DATA_BITS_6; 435 break; 436 case CS7: 437 frame_fmt |= FMT_DATA_BITS_7; 438 break; 439 default: 440 case CS8: 441 frame_fmt |= FMT_DATA_BITS_8; 442 break; 443 } 444 445 /* manufacturer claims that this device can work with baud rates 446 * up to 3 Mbps; I've tested it only on 115200 bps, so I can't 447 * guarantee that any other baud rate will work (especially 448 * the higher ones) 449 */ 450 br = tty_get_baud_rate(tty); 451 if (br == 0) { 452 divisor = 0; 453 } else { 454 int real_br; 455 int new_divisor; 456 br = min(br, OTI6858_MAX_BAUD_RATE); 457 458 new_divisor = (96000000 + 8 * br) / (16 * br); 459 real_br = 96000000 / (16 * new_divisor); 460 divisor = cpu_to_le16(new_divisor); 461 tty_encode_baud_rate(tty, real_br, real_br); 462 } 463 464 frame_fmt &= ~FMT_STOP_BITS_MASK; 465 if ((cflag & CSTOPB) != 0) 466 frame_fmt |= FMT_STOP_BITS_2; 467 else 468 frame_fmt |= FMT_STOP_BITS_1; 469 470 frame_fmt &= ~FMT_PARITY_MASK; 471 if ((cflag & PARENB) != 0) { 472 if ((cflag & PARODD) != 0) 473 frame_fmt |= FMT_PARITY_ODD; 474 else 475 frame_fmt |= FMT_PARITY_EVEN; 476 } else { 477 frame_fmt |= FMT_PARITY_NONE; 478 } 479 480 control &= ~CONTROL_MASK; 481 if ((cflag & CRTSCTS) != 0) 482 control |= (CONTROL_DTR_HIGH | CONTROL_RTS_HIGH); 483 484 /* change control lines if we are switching to or from B0 */ 485 /* FIXME: 486 spin_lock_irqsave(&priv->lock, flags); 487 control = priv->line_control; 488 if ((cflag & CBAUD) == B0) 489 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS); 490 else 491 priv->line_control |= (CONTROL_DTR | CONTROL_RTS); 492 if (control != priv->line_control) { 493 control = priv->line_control; 494 spin_unlock_irqrestore(&priv->lock, flags); 495 set_control_lines(serial->dev, control); 496 } else { 497 spin_unlock_irqrestore(&priv->lock, flags); 498 } 499 */ 500 501 spin_lock_irqsave(&priv->lock, flags); 502 if (divisor != priv->pending_setup.divisor 503 || control != priv->pending_setup.control 504 || frame_fmt != priv->pending_setup.frame_fmt) { 505 priv->pending_setup.divisor = divisor; 506 priv->pending_setup.control = control; 507 priv->pending_setup.frame_fmt = frame_fmt; 508 } 509 spin_unlock_irqrestore(&priv->lock, flags); 510 } 511 512 static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port) 513 { 514 struct oti6858_private *priv = usb_get_serial_port_data(port); 515 struct ktermios tmp_termios; 516 struct usb_serial *serial = port->serial; 517 struct oti6858_control_pkt *buf; 518 unsigned long flags; 519 int result; 520 521 usb_clear_halt(serial->dev, port->write_urb->pipe); 522 usb_clear_halt(serial->dev, port->read_urb->pipe); 523 524 buf = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL); 525 if (buf == NULL) { 526 dev_err(&port->dev, "%s(): out of memory!\n", __func__); 527 return -ENOMEM; 528 } 529 530 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 531 OTI6858_REQ_T_GET_STATUS, 532 OTI6858_REQ_GET_STATUS, 533 0, 0, 534 buf, OTI6858_CTRL_PKT_SIZE, 535 100); 536 if (result != OTI6858_CTRL_PKT_SIZE) { 537 /* assume default (after power-on reset) values */ 538 buf->divisor = cpu_to_le16(0x009c); /* 38400 bps */ 539 buf->frame_fmt = 0x03; /* 8N1 */ 540 buf->something = 0x43; 541 buf->control = 0x4c; /* DTR, RTS */ 542 buf->tx_status = 0x00; 543 buf->pin_state = 0x5b; /* RTS, CTS, DSR, DTR, RI, DCD */ 544 buf->rx_bytes_avail = 0x00; 545 } 546 547 spin_lock_irqsave(&priv->lock, flags); 548 memcpy(&priv->status, buf, OTI6858_CTRL_PKT_SIZE); 549 priv->pending_setup.divisor = buf->divisor; 550 priv->pending_setup.frame_fmt = buf->frame_fmt; 551 priv->pending_setup.control = buf->control; 552 spin_unlock_irqrestore(&priv->lock, flags); 553 kfree(buf); 554 555 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__); 556 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); 557 if (result != 0) { 558 dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n", 559 __func__, result); 560 oti6858_close(port); 561 return result; 562 } 563 564 /* setup termios */ 565 if (tty) 566 oti6858_set_termios(tty, port, &tmp_termios); 567 port->port.drain_delay = 256; /* FIXME: check the FIFO length */ 568 return 0; 569 } 570 571 static void oti6858_close(struct usb_serial_port *port) 572 { 573 struct oti6858_private *priv = usb_get_serial_port_data(port); 574 unsigned long flags; 575 576 spin_lock_irqsave(&port->lock, flags); 577 /* clear out any remaining data in the buffer */ 578 kfifo_reset_out(&port->write_fifo); 579 spin_unlock_irqrestore(&port->lock, flags); 580 581 dev_dbg(&port->dev, "%s(): after buf_clear()\n", __func__); 582 583 /* cancel scheduled setup */ 584 cancel_delayed_work_sync(&priv->delayed_setup_work); 585 cancel_delayed_work_sync(&priv->delayed_write_work); 586 587 /* shutdown our urbs */ 588 dev_dbg(&port->dev, "%s(): shutting down urbs\n", __func__); 589 usb_kill_urb(port->write_urb); 590 usb_kill_urb(port->read_urb); 591 usb_kill_urb(port->interrupt_in_urb); 592 } 593 594 static int oti6858_tiocmset(struct tty_struct *tty, 595 unsigned int set, unsigned int clear) 596 { 597 struct usb_serial_port *port = tty->driver_data; 598 struct oti6858_private *priv = usb_get_serial_port_data(port); 599 unsigned long flags; 600 u8 control; 601 602 dev_dbg(&port->dev, "%s(set = 0x%08x, clear = 0x%08x)\n", 603 __func__, set, clear); 604 605 /* FIXME: check if this is correct (active high/low) */ 606 spin_lock_irqsave(&priv->lock, flags); 607 control = priv->pending_setup.control; 608 if ((set & TIOCM_RTS) != 0) 609 control |= CONTROL_RTS_HIGH; 610 if ((set & TIOCM_DTR) != 0) 611 control |= CONTROL_DTR_HIGH; 612 if ((clear & TIOCM_RTS) != 0) 613 control &= ~CONTROL_RTS_HIGH; 614 if ((clear & TIOCM_DTR) != 0) 615 control &= ~CONTROL_DTR_HIGH; 616 617 if (control != priv->pending_setup.control) 618 priv->pending_setup.control = control; 619 620 spin_unlock_irqrestore(&priv->lock, flags); 621 return 0; 622 } 623 624 static int oti6858_tiocmget(struct tty_struct *tty) 625 { 626 struct usb_serial_port *port = tty->driver_data; 627 struct oti6858_private *priv = usb_get_serial_port_data(port); 628 unsigned long flags; 629 unsigned pin_state; 630 unsigned result = 0; 631 632 spin_lock_irqsave(&priv->lock, flags); 633 pin_state = priv->status.pin_state & PIN_MASK; 634 spin_unlock_irqrestore(&priv->lock, flags); 635 636 /* FIXME: check if this is correct (active high/low) */ 637 if ((pin_state & PIN_RTS) != 0) 638 result |= TIOCM_RTS; 639 if ((pin_state & PIN_CTS) != 0) 640 result |= TIOCM_CTS; 641 if ((pin_state & PIN_DSR) != 0) 642 result |= TIOCM_DSR; 643 if ((pin_state & PIN_DTR) != 0) 644 result |= TIOCM_DTR; 645 if ((pin_state & PIN_RI) != 0) 646 result |= TIOCM_RI; 647 if ((pin_state & PIN_DCD) != 0) 648 result |= TIOCM_CD; 649 650 dev_dbg(&port->dev, "%s() = 0x%08x\n", __func__, result); 651 652 return result; 653 } 654 655 static int wait_modem_info(struct usb_serial_port *port, unsigned int arg) 656 { 657 struct oti6858_private *priv = usb_get_serial_port_data(port); 658 unsigned long flags; 659 unsigned int prev, status; 660 unsigned int changed; 661 662 spin_lock_irqsave(&priv->lock, flags); 663 prev = priv->status.pin_state; 664 spin_unlock_irqrestore(&priv->lock, flags); 665 666 while (1) { 667 wait_event_interruptible(priv->intr_wait, 668 priv->status.pin_state != prev); 669 if (signal_pending(current)) 670 return -ERESTARTSYS; 671 672 spin_lock_irqsave(&priv->lock, flags); 673 status = priv->status.pin_state & PIN_MASK; 674 spin_unlock_irqrestore(&priv->lock, flags); 675 676 changed = prev ^ status; 677 /* FIXME: check if this is correct (active high/low) */ 678 if (((arg & TIOCM_RNG) && (changed & PIN_RI)) || 679 ((arg & TIOCM_DSR) && (changed & PIN_DSR)) || 680 ((arg & TIOCM_CD) && (changed & PIN_DCD)) || 681 ((arg & TIOCM_CTS) && (changed & PIN_CTS))) 682 return 0; 683 prev = status; 684 } 685 686 /* NOTREACHED */ 687 return 0; 688 } 689 690 static int oti6858_ioctl(struct tty_struct *tty, 691 unsigned int cmd, unsigned long arg) 692 { 693 struct usb_serial_port *port = tty->driver_data; 694 695 dev_dbg(&port->dev, "%s(cmd = 0x%04x, arg = 0x%08lx)\n", __func__, cmd, arg); 696 697 switch (cmd) { 698 case TIOCMIWAIT: 699 dev_dbg(&port->dev, "%s(): TIOCMIWAIT\n", __func__); 700 return wait_modem_info(port, arg); 701 default: 702 dev_dbg(&port->dev, "%s(): 0x%04x not supported\n", __func__, cmd); 703 break; 704 } 705 return -ENOIOCTLCMD; 706 } 707 708 static void oti6858_read_int_callback(struct urb *urb) 709 { 710 struct usb_serial_port *port = urb->context; 711 struct oti6858_private *priv = usb_get_serial_port_data(port); 712 int transient = 0, can_recv = 0, resubmit = 1; 713 int status = urb->status; 714 715 switch (status) { 716 case 0: 717 /* success */ 718 break; 719 case -ECONNRESET: 720 case -ENOENT: 721 case -ESHUTDOWN: 722 /* this urb is terminated, clean up */ 723 dev_dbg(&urb->dev->dev, "%s(): urb shutting down with status: %d\n", 724 __func__, status); 725 return; 726 default: 727 dev_dbg(&urb->dev->dev, "%s(): nonzero urb status received: %d\n", 728 __func__, status); 729 break; 730 } 731 732 if (status == 0 && urb->actual_length == OTI6858_CTRL_PKT_SIZE) { 733 struct oti6858_control_pkt *xs = urb->transfer_buffer; 734 unsigned long flags; 735 736 spin_lock_irqsave(&priv->lock, flags); 737 738 if (!priv->transient) { 739 if (!OTI6858_CTRL_EQUALS_PENDING(xs, priv)) { 740 if (xs->rx_bytes_avail == 0) { 741 priv->transient = 4; 742 priv->setup_done = 0; 743 resubmit = 0; 744 dev_dbg(&port->dev, "%s(): scheduling setup_line()\n", __func__); 745 schedule_delayed_work(&priv->delayed_setup_work, 0); 746 } 747 } 748 } else { 749 if (OTI6858_CTRL_EQUALS_PENDING(xs, priv)) { 750 priv->transient = 0; 751 } else if (!priv->setup_done) { 752 resubmit = 0; 753 } else if (--priv->transient == 0) { 754 if (xs->rx_bytes_avail == 0) { 755 priv->transient = 4; 756 priv->setup_done = 0; 757 resubmit = 0; 758 dev_dbg(&port->dev, "%s(): scheduling setup_line()\n", __func__); 759 schedule_delayed_work(&priv->delayed_setup_work, 0); 760 } 761 } 762 } 763 764 if (!priv->transient) { 765 if (xs->pin_state != priv->status.pin_state) 766 wake_up_interruptible(&priv->intr_wait); 767 memcpy(&priv->status, xs, OTI6858_CTRL_PKT_SIZE); 768 } 769 770 if (!priv->transient && xs->rx_bytes_avail != 0) { 771 can_recv = xs->rx_bytes_avail; 772 priv->flags.read_urb_in_use = 1; 773 } 774 775 transient = priv->transient; 776 spin_unlock_irqrestore(&priv->lock, flags); 777 } 778 779 if (can_recv) { 780 int result; 781 782 result = usb_submit_urb(port->read_urb, GFP_ATOMIC); 783 if (result != 0) { 784 priv->flags.read_urb_in_use = 0; 785 dev_err(&port->dev, "%s(): usb_submit_urb() failed," 786 " error %d\n", __func__, result); 787 } else { 788 resubmit = 0; 789 } 790 } else if (!transient) { 791 unsigned long flags; 792 int count; 793 794 spin_lock_irqsave(&port->lock, flags); 795 count = kfifo_len(&port->write_fifo); 796 spin_unlock_irqrestore(&port->lock, flags); 797 798 spin_lock_irqsave(&priv->lock, flags); 799 if (priv->flags.write_urb_in_use == 0 && count != 0) { 800 schedule_delayed_work(&priv->delayed_write_work, 0); 801 resubmit = 0; 802 } 803 spin_unlock_irqrestore(&priv->lock, flags); 804 } 805 806 if (resubmit) { 807 int result; 808 809 /* dev_dbg(&urb->dev->dev, "%s(): submitting interrupt urb\n", __func__); */ 810 result = usb_submit_urb(urb, GFP_ATOMIC); 811 if (result != 0) { 812 dev_err(&urb->dev->dev, 813 "%s(): usb_submit_urb() failed with" 814 " error %d\n", __func__, result); 815 } 816 } 817 } 818 819 static void oti6858_read_bulk_callback(struct urb *urb) 820 { 821 struct usb_serial_port *port = urb->context; 822 struct oti6858_private *priv = usb_get_serial_port_data(port); 823 struct tty_struct *tty; 824 unsigned char *data = urb->transfer_buffer; 825 unsigned long flags; 826 int status = urb->status; 827 int result; 828 829 spin_lock_irqsave(&priv->lock, flags); 830 priv->flags.read_urb_in_use = 0; 831 spin_unlock_irqrestore(&priv->lock, flags); 832 833 if (status != 0) { 834 dev_dbg(&urb->dev->dev, "%s(): unable to handle the error, exiting\n", __func__); 835 return; 836 } 837 838 tty = tty_port_tty_get(&port->port); 839 if (tty != NULL && urb->actual_length > 0) { 840 tty_insert_flip_string(tty, data, urb->actual_length); 841 tty_flip_buffer_push(tty); 842 } 843 tty_kref_put(tty); 844 845 /* schedule the interrupt urb */ 846 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC); 847 if (result != 0 && result != -EPERM) { 848 dev_err(&port->dev, "%s(): usb_submit_urb() failed," 849 " error %d\n", __func__, result); 850 } 851 } 852 853 static void oti6858_write_bulk_callback(struct urb *urb) 854 { 855 struct usb_serial_port *port = urb->context; 856 struct oti6858_private *priv = usb_get_serial_port_data(port); 857 int status = urb->status; 858 int result; 859 860 switch (status) { 861 case 0: 862 /* success */ 863 break; 864 case -ECONNRESET: 865 case -ENOENT: 866 case -ESHUTDOWN: 867 /* this urb is terminated, clean up */ 868 dev_dbg(&urb->dev->dev, "%s(): urb shutting down with status: %d\n", __func__, status); 869 priv->flags.write_urb_in_use = 0; 870 return; 871 default: 872 /* error in the urb, so we have to resubmit it */ 873 dev_dbg(&urb->dev->dev, "%s(): nonzero write bulk status received: %d\n", __func__, status); 874 dev_dbg(&urb->dev->dev, "%s(): overflow in write\n", __func__); 875 876 port->write_urb->transfer_buffer_length = 1; 877 result = usb_submit_urb(port->write_urb, GFP_ATOMIC); 878 if (result) { 879 dev_err_console(port, "%s(): usb_submit_urb() failed," 880 " error %d\n", __func__, result); 881 } else { 882 return; 883 } 884 } 885 886 priv->flags.write_urb_in_use = 0; 887 888 /* schedule the interrupt urb if we are still open */ 889 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__); 890 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC); 891 if (result != 0) { 892 dev_err(&port->dev, "%s(): failed submitting int urb," 893 " error %d\n", __func__, result); 894 } 895 } 896 897 module_usb_serial_driver(serial_drivers, id_table); 898 899 MODULE_DESCRIPTION(OTI6858_DESCRIPTION); 900 MODULE_AUTHOR(OTI6858_AUTHOR); 901 MODULE_LICENSE("GPL"); 902