1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Ours Technology Inc. OTi-6858 USB to serial adapter driver. 4 * 5 * Copyleft (C) 2007 Kees Lemmens (adapted for kernel 2.6.20) 6 * Copyright (C) 2006 Tomasz Michal Lukaszewski (FIXME: add e-mail) 7 * Copyright (C) 2001-2004 Greg Kroah-Hartman (greg@kroah.com) 8 * Copyright (C) 2003 IBM Corp. 9 * 10 * Many thanks to the authors of pl2303 driver: all functions in this file 11 * are heavily based on pl2303 code, buffering code is a 1-to-1 copy. 12 * 13 * Warning! You use this driver on your own risk! The only official 14 * description of this device I have is datasheet from manufacturer, 15 * and it doesn't contain almost any information needed to write a driver. 16 * Almost all knowlegde used while writing this driver was gathered by: 17 * - analyzing traffic between device and the M$ Windows 2000 driver, 18 * - trying different bit combinations and checking pin states 19 * with a voltmeter, 20 * - receiving malformed frames and producing buffer overflows 21 * to learn how errors are reported, 22 * So, THIS CODE CAN DESTROY OTi-6858 AND ANY OTHER DEVICES, THAT ARE 23 * CONNECTED TO IT! 24 * 25 * This program is free software; you can redistribute it and/or modify 26 * it under the terms of the GNU General Public License as published by 27 * the Free Software Foundation; either version 2 of the License. 28 * 29 * See Documentation/usb/usb-serial.txt for more information on using this 30 * driver 31 * 32 * TODO: 33 * - implement correct flushing for ioctls and oti6858_close() 34 * - check how errors (rx overflow, parity error, framing error) are reported 35 * - implement oti6858_break_ctl() 36 * - implement more ioctls 37 * - test/implement flow control 38 * - allow setting custom baud rates 39 */ 40 41 #include <linux/kernel.h> 42 #include <linux/errno.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_MSR_MASK 0x1b 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 void oti6858_read_int_callback(struct urb *urb); 129 static void oti6858_read_bulk_callback(struct urb *urb); 130 static void oti6858_write_bulk_callback(struct urb *urb); 131 static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port, 132 const unsigned char *buf, int count); 133 static int oti6858_write_room(struct tty_struct *tty); 134 static int oti6858_chars_in_buffer(struct tty_struct *tty); 135 static int oti6858_tiocmget(struct tty_struct *tty); 136 static int oti6858_tiocmset(struct tty_struct *tty, 137 unsigned int set, unsigned int clear); 138 static int oti6858_port_probe(struct usb_serial_port *port); 139 static int oti6858_port_remove(struct usb_serial_port *port); 140 141 /* device info */ 142 static struct usb_serial_driver oti6858_device = { 143 .driver = { 144 .owner = THIS_MODULE, 145 .name = "oti6858", 146 }, 147 .id_table = id_table, 148 .num_ports = 1, 149 .num_bulk_in = 1, 150 .num_bulk_out = 1, 151 .num_interrupt_in = 1, 152 .open = oti6858_open, 153 .close = oti6858_close, 154 .write = oti6858_write, 155 .set_termios = oti6858_set_termios, 156 .init_termios = oti6858_init_termios, 157 .tiocmget = oti6858_tiocmget, 158 .tiocmset = oti6858_tiocmset, 159 .tiocmiwait = usb_serial_generic_tiocmiwait, 160 .read_bulk_callback = oti6858_read_bulk_callback, 161 .read_int_callback = oti6858_read_int_callback, 162 .write_bulk_callback = oti6858_write_bulk_callback, 163 .write_room = oti6858_write_room, 164 .chars_in_buffer = oti6858_chars_in_buffer, 165 .port_probe = oti6858_port_probe, 166 .port_remove = oti6858_port_remove, 167 }; 168 169 static struct usb_serial_driver * const serial_drivers[] = { 170 &oti6858_device, NULL 171 }; 172 173 struct oti6858_private { 174 spinlock_t lock; 175 176 struct oti6858_control_pkt status; 177 178 struct { 179 u8 read_urb_in_use; 180 u8 write_urb_in_use; 181 } flags; 182 struct delayed_work delayed_write_work; 183 184 struct { 185 __le16 divisor; 186 u8 frame_fmt; 187 u8 control; 188 } pending_setup; 189 u8 transient; 190 u8 setup_done; 191 struct delayed_work delayed_setup_work; 192 193 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) { 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 return; 294 295 result = usb_control_msg(port->serial->dev, 296 usb_rcvctrlpipe(port->serial->dev, 0), 297 OTI6858_REQ_T_CHECK_TXBUFF, 298 OTI6858_REQ_CHECK_TXBUFF, 299 count, 0, allow, 1, 100); 300 if (result != 1 || *allow != 0) 301 count = 0; 302 kfree(allow); 303 } 304 305 if (count == 0) { 306 priv->flags.write_urb_in_use = 0; 307 308 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__); 309 result = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO); 310 if (result != 0) { 311 dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n", 312 __func__, result); 313 } 314 return; 315 } 316 317 count = kfifo_out_locked(&port->write_fifo, 318 port->write_urb->transfer_buffer, 319 count, &port->lock); 320 port->write_urb->transfer_buffer_length = count; 321 result = usb_submit_urb(port->write_urb, GFP_NOIO); 322 if (result != 0) { 323 dev_err_console(port, "%s(): usb_submit_urb() failed with error %d\n", 324 __func__, result); 325 priv->flags.write_urb_in_use = 0; 326 } 327 328 usb_serial_port_softint(port); 329 } 330 331 static int oti6858_port_probe(struct usb_serial_port *port) 332 { 333 struct oti6858_private *priv; 334 335 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 336 if (!priv) 337 return -ENOMEM; 338 339 spin_lock_init(&priv->lock); 340 priv->port = port; 341 INIT_DELAYED_WORK(&priv->delayed_setup_work, setup_line); 342 INIT_DELAYED_WORK(&priv->delayed_write_work, send_data); 343 344 usb_set_serial_port_data(port, priv); 345 346 port->port.drain_delay = 256; /* FIXME: check the FIFO length */ 347 348 return 0; 349 } 350 351 static int oti6858_port_remove(struct usb_serial_port *port) 352 { 353 struct oti6858_private *priv; 354 355 priv = usb_get_serial_port_data(port); 356 kfree(priv); 357 358 return 0; 359 } 360 361 static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port, 362 const unsigned char *buf, int count) 363 { 364 if (!count) 365 return count; 366 367 count = kfifo_in_locked(&port->write_fifo, buf, count, &port->lock); 368 369 return count; 370 } 371 372 static int oti6858_write_room(struct tty_struct *tty) 373 { 374 struct usb_serial_port *port = tty->driver_data; 375 int room = 0; 376 unsigned long flags; 377 378 spin_lock_irqsave(&port->lock, flags); 379 room = kfifo_avail(&port->write_fifo); 380 spin_unlock_irqrestore(&port->lock, flags); 381 382 return room; 383 } 384 385 static int oti6858_chars_in_buffer(struct tty_struct *tty) 386 { 387 struct usb_serial_port *port = tty->driver_data; 388 int chars = 0; 389 unsigned long flags; 390 391 spin_lock_irqsave(&port->lock, flags); 392 chars = kfifo_len(&port->write_fifo); 393 spin_unlock_irqrestore(&port->lock, flags); 394 395 return chars; 396 } 397 398 static void oti6858_init_termios(struct tty_struct *tty) 399 { 400 tty->termios = tty_std_termios; 401 tty->termios.c_cflag = B38400 | CS8 | CREAD | HUPCL | CLOCAL; 402 tty->termios.c_ispeed = 38400; 403 tty->termios.c_ospeed = 38400; 404 } 405 406 static void oti6858_set_termios(struct tty_struct *tty, 407 struct usb_serial_port *port, struct ktermios *old_termios) 408 { 409 struct oti6858_private *priv = usb_get_serial_port_data(port); 410 unsigned long flags; 411 unsigned int cflag; 412 u8 frame_fmt, control; 413 __le16 divisor; 414 int br; 415 416 cflag = tty->termios.c_cflag; 417 418 spin_lock_irqsave(&priv->lock, flags); 419 divisor = priv->pending_setup.divisor; 420 frame_fmt = priv->pending_setup.frame_fmt; 421 control = priv->pending_setup.control; 422 spin_unlock_irqrestore(&priv->lock, flags); 423 424 frame_fmt &= ~FMT_DATA_BITS_MASK; 425 switch (cflag & CSIZE) { 426 case CS5: 427 frame_fmt |= FMT_DATA_BITS_5; 428 break; 429 case CS6: 430 frame_fmt |= FMT_DATA_BITS_6; 431 break; 432 case CS7: 433 frame_fmt |= FMT_DATA_BITS_7; 434 break; 435 default: 436 case CS8: 437 frame_fmt |= FMT_DATA_BITS_8; 438 break; 439 } 440 441 /* manufacturer claims that this device can work with baud rates 442 * up to 3 Mbps; I've tested it only on 115200 bps, so I can't 443 * guarantee that any other baud rate will work (especially 444 * the higher ones) 445 */ 446 br = tty_get_baud_rate(tty); 447 if (br == 0) { 448 divisor = 0; 449 } else { 450 int real_br; 451 int new_divisor; 452 br = min(br, OTI6858_MAX_BAUD_RATE); 453 454 new_divisor = (96000000 + 8 * br) / (16 * br); 455 real_br = 96000000 / (16 * new_divisor); 456 divisor = cpu_to_le16(new_divisor); 457 tty_encode_baud_rate(tty, real_br, real_br); 458 } 459 460 frame_fmt &= ~FMT_STOP_BITS_MASK; 461 if ((cflag & CSTOPB) != 0) 462 frame_fmt |= FMT_STOP_BITS_2; 463 else 464 frame_fmt |= FMT_STOP_BITS_1; 465 466 frame_fmt &= ~FMT_PARITY_MASK; 467 if ((cflag & PARENB) != 0) { 468 if ((cflag & PARODD) != 0) 469 frame_fmt |= FMT_PARITY_ODD; 470 else 471 frame_fmt |= FMT_PARITY_EVEN; 472 } else { 473 frame_fmt |= FMT_PARITY_NONE; 474 } 475 476 control &= ~CONTROL_MASK; 477 if ((cflag & CRTSCTS) != 0) 478 control |= (CONTROL_DTR_HIGH | CONTROL_RTS_HIGH); 479 480 /* change control lines if we are switching to or from B0 */ 481 /* FIXME: 482 spin_lock_irqsave(&priv->lock, flags); 483 control = priv->line_control; 484 if ((cflag & CBAUD) == B0) 485 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS); 486 else 487 priv->line_control |= (CONTROL_DTR | CONTROL_RTS); 488 if (control != priv->line_control) { 489 control = priv->line_control; 490 spin_unlock_irqrestore(&priv->lock, flags); 491 set_control_lines(serial->dev, control); 492 } else { 493 spin_unlock_irqrestore(&priv->lock, flags); 494 } 495 */ 496 497 spin_lock_irqsave(&priv->lock, flags); 498 if (divisor != priv->pending_setup.divisor 499 || control != priv->pending_setup.control 500 || frame_fmt != priv->pending_setup.frame_fmt) { 501 priv->pending_setup.divisor = divisor; 502 priv->pending_setup.control = control; 503 priv->pending_setup.frame_fmt = frame_fmt; 504 } 505 spin_unlock_irqrestore(&priv->lock, flags); 506 } 507 508 static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port) 509 { 510 struct oti6858_private *priv = usb_get_serial_port_data(port); 511 struct usb_serial *serial = port->serial; 512 struct oti6858_control_pkt *buf; 513 unsigned long flags; 514 int result; 515 516 usb_clear_halt(serial->dev, port->write_urb->pipe); 517 usb_clear_halt(serial->dev, port->read_urb->pipe); 518 519 buf = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL); 520 if (!buf) 521 return -ENOMEM; 522 523 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 524 OTI6858_REQ_T_GET_STATUS, 525 OTI6858_REQ_GET_STATUS, 526 0, 0, 527 buf, OTI6858_CTRL_PKT_SIZE, 528 100); 529 if (result != OTI6858_CTRL_PKT_SIZE) { 530 /* assume default (after power-on reset) values */ 531 buf->divisor = cpu_to_le16(0x009c); /* 38400 bps */ 532 buf->frame_fmt = 0x03; /* 8N1 */ 533 buf->something = 0x43; 534 buf->control = 0x4c; /* DTR, RTS */ 535 buf->tx_status = 0x00; 536 buf->pin_state = 0x5b; /* RTS, CTS, DSR, DTR, RI, DCD */ 537 buf->rx_bytes_avail = 0x00; 538 } 539 540 spin_lock_irqsave(&priv->lock, flags); 541 memcpy(&priv->status, buf, OTI6858_CTRL_PKT_SIZE); 542 priv->pending_setup.divisor = buf->divisor; 543 priv->pending_setup.frame_fmt = buf->frame_fmt; 544 priv->pending_setup.control = buf->control; 545 spin_unlock_irqrestore(&priv->lock, flags); 546 kfree(buf); 547 548 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__); 549 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); 550 if (result != 0) { 551 dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n", 552 __func__, result); 553 oti6858_close(port); 554 return result; 555 } 556 557 /* setup termios */ 558 if (tty) 559 oti6858_set_termios(tty, port, NULL); 560 561 return 0; 562 } 563 564 static void oti6858_close(struct usb_serial_port *port) 565 { 566 struct oti6858_private *priv = usb_get_serial_port_data(port); 567 unsigned long flags; 568 569 spin_lock_irqsave(&port->lock, flags); 570 /* clear out any remaining data in the buffer */ 571 kfifo_reset_out(&port->write_fifo); 572 spin_unlock_irqrestore(&port->lock, flags); 573 574 dev_dbg(&port->dev, "%s(): after buf_clear()\n", __func__); 575 576 /* cancel scheduled setup */ 577 cancel_delayed_work_sync(&priv->delayed_setup_work); 578 cancel_delayed_work_sync(&priv->delayed_write_work); 579 580 /* shutdown our urbs */ 581 dev_dbg(&port->dev, "%s(): shutting down urbs\n", __func__); 582 usb_kill_urb(port->write_urb); 583 usb_kill_urb(port->read_urb); 584 usb_kill_urb(port->interrupt_in_urb); 585 } 586 587 static int oti6858_tiocmset(struct tty_struct *tty, 588 unsigned int set, unsigned int clear) 589 { 590 struct usb_serial_port *port = tty->driver_data; 591 struct oti6858_private *priv = usb_get_serial_port_data(port); 592 unsigned long flags; 593 u8 control; 594 595 dev_dbg(&port->dev, "%s(set = 0x%08x, clear = 0x%08x)\n", 596 __func__, set, clear); 597 598 /* FIXME: check if this is correct (active high/low) */ 599 spin_lock_irqsave(&priv->lock, flags); 600 control = priv->pending_setup.control; 601 if ((set & TIOCM_RTS) != 0) 602 control |= CONTROL_RTS_HIGH; 603 if ((set & TIOCM_DTR) != 0) 604 control |= CONTROL_DTR_HIGH; 605 if ((clear & TIOCM_RTS) != 0) 606 control &= ~CONTROL_RTS_HIGH; 607 if ((clear & TIOCM_DTR) != 0) 608 control &= ~CONTROL_DTR_HIGH; 609 610 if (control != priv->pending_setup.control) 611 priv->pending_setup.control = control; 612 613 spin_unlock_irqrestore(&priv->lock, flags); 614 return 0; 615 } 616 617 static int oti6858_tiocmget(struct tty_struct *tty) 618 { 619 struct usb_serial_port *port = tty->driver_data; 620 struct oti6858_private *priv = usb_get_serial_port_data(port); 621 unsigned long flags; 622 unsigned pin_state; 623 unsigned result = 0; 624 625 spin_lock_irqsave(&priv->lock, flags); 626 pin_state = priv->status.pin_state & PIN_MASK; 627 spin_unlock_irqrestore(&priv->lock, flags); 628 629 /* FIXME: check if this is correct (active high/low) */ 630 if ((pin_state & PIN_RTS) != 0) 631 result |= TIOCM_RTS; 632 if ((pin_state & PIN_CTS) != 0) 633 result |= TIOCM_CTS; 634 if ((pin_state & PIN_DSR) != 0) 635 result |= TIOCM_DSR; 636 if ((pin_state & PIN_DTR) != 0) 637 result |= TIOCM_DTR; 638 if ((pin_state & PIN_RI) != 0) 639 result |= TIOCM_RI; 640 if ((pin_state & PIN_DCD) != 0) 641 result |= TIOCM_CD; 642 643 dev_dbg(&port->dev, "%s() = 0x%08x\n", __func__, result); 644 645 return result; 646 } 647 648 static void oti6858_read_int_callback(struct urb *urb) 649 { 650 struct usb_serial_port *port = urb->context; 651 struct oti6858_private *priv = usb_get_serial_port_data(port); 652 int transient = 0, can_recv = 0, resubmit = 1; 653 int status = urb->status; 654 655 switch (status) { 656 case 0: 657 /* success */ 658 break; 659 case -ECONNRESET: 660 case -ENOENT: 661 case -ESHUTDOWN: 662 /* this urb is terminated, clean up */ 663 dev_dbg(&urb->dev->dev, "%s(): urb shutting down with status: %d\n", 664 __func__, status); 665 return; 666 default: 667 dev_dbg(&urb->dev->dev, "%s(): nonzero urb status received: %d\n", 668 __func__, status); 669 break; 670 } 671 672 if (status == 0 && urb->actual_length == OTI6858_CTRL_PKT_SIZE) { 673 struct oti6858_control_pkt *xs = urb->transfer_buffer; 674 unsigned long flags; 675 676 spin_lock_irqsave(&priv->lock, flags); 677 678 if (!priv->transient) { 679 if (!OTI6858_CTRL_EQUALS_PENDING(xs, priv)) { 680 if (xs->rx_bytes_avail == 0) { 681 priv->transient = 4; 682 priv->setup_done = 0; 683 resubmit = 0; 684 dev_dbg(&port->dev, "%s(): scheduling setup_line()\n", __func__); 685 schedule_delayed_work(&priv->delayed_setup_work, 0); 686 } 687 } 688 } else { 689 if (OTI6858_CTRL_EQUALS_PENDING(xs, priv)) { 690 priv->transient = 0; 691 } else if (!priv->setup_done) { 692 resubmit = 0; 693 } else if (--priv->transient == 0) { 694 if (xs->rx_bytes_avail == 0) { 695 priv->transient = 4; 696 priv->setup_done = 0; 697 resubmit = 0; 698 dev_dbg(&port->dev, "%s(): scheduling setup_line()\n", __func__); 699 schedule_delayed_work(&priv->delayed_setup_work, 0); 700 } 701 } 702 } 703 704 if (!priv->transient) { 705 u8 delta = xs->pin_state ^ priv->status.pin_state; 706 707 if (delta & PIN_MSR_MASK) { 708 if (delta & PIN_CTS) 709 port->icount.cts++; 710 if (delta & PIN_DSR) 711 port->icount.dsr++; 712 if (delta & PIN_RI) 713 port->icount.rng++; 714 if (delta & PIN_DCD) 715 port->icount.dcd++; 716 717 wake_up_interruptible(&port->port.delta_msr_wait); 718 } 719 720 memcpy(&priv->status, xs, OTI6858_CTRL_PKT_SIZE); 721 } 722 723 if (!priv->transient && xs->rx_bytes_avail != 0) { 724 can_recv = xs->rx_bytes_avail; 725 priv->flags.read_urb_in_use = 1; 726 } 727 728 transient = priv->transient; 729 spin_unlock_irqrestore(&priv->lock, flags); 730 } 731 732 if (can_recv) { 733 int result; 734 735 result = usb_submit_urb(port->read_urb, GFP_ATOMIC); 736 if (result != 0) { 737 priv->flags.read_urb_in_use = 0; 738 dev_err(&port->dev, "%s(): usb_submit_urb() failed," 739 " error %d\n", __func__, result); 740 } else { 741 resubmit = 0; 742 } 743 } else if (!transient) { 744 unsigned long flags; 745 int count; 746 747 spin_lock_irqsave(&port->lock, flags); 748 count = kfifo_len(&port->write_fifo); 749 spin_unlock_irqrestore(&port->lock, flags); 750 751 spin_lock_irqsave(&priv->lock, flags); 752 if (priv->flags.write_urb_in_use == 0 && count != 0) { 753 schedule_delayed_work(&priv->delayed_write_work, 0); 754 resubmit = 0; 755 } 756 spin_unlock_irqrestore(&priv->lock, flags); 757 } 758 759 if (resubmit) { 760 int result; 761 762 /* dev_dbg(&urb->dev->dev, "%s(): submitting interrupt urb\n", __func__); */ 763 result = usb_submit_urb(urb, GFP_ATOMIC); 764 if (result != 0) { 765 dev_err(&urb->dev->dev, 766 "%s(): usb_submit_urb() failed with" 767 " error %d\n", __func__, result); 768 } 769 } 770 } 771 772 static void oti6858_read_bulk_callback(struct urb *urb) 773 { 774 struct usb_serial_port *port = urb->context; 775 struct oti6858_private *priv = usb_get_serial_port_data(port); 776 unsigned char *data = urb->transfer_buffer; 777 unsigned long flags; 778 int status = urb->status; 779 int result; 780 781 spin_lock_irqsave(&priv->lock, flags); 782 priv->flags.read_urb_in_use = 0; 783 spin_unlock_irqrestore(&priv->lock, flags); 784 785 if (status != 0) { 786 dev_dbg(&urb->dev->dev, "%s(): unable to handle the error, exiting\n", __func__); 787 return; 788 } 789 790 if (urb->actual_length > 0) { 791 tty_insert_flip_string(&port->port, data, urb->actual_length); 792 tty_flip_buffer_push(&port->port); 793 } 794 795 /* schedule the interrupt urb */ 796 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC); 797 if (result != 0 && result != -EPERM) { 798 dev_err(&port->dev, "%s(): usb_submit_urb() failed," 799 " error %d\n", __func__, result); 800 } 801 } 802 803 static void oti6858_write_bulk_callback(struct urb *urb) 804 { 805 struct usb_serial_port *port = urb->context; 806 struct oti6858_private *priv = usb_get_serial_port_data(port); 807 int status = urb->status; 808 int result; 809 810 switch (status) { 811 case 0: 812 /* success */ 813 break; 814 case -ECONNRESET: 815 case -ENOENT: 816 case -ESHUTDOWN: 817 /* this urb is terminated, clean up */ 818 dev_dbg(&urb->dev->dev, "%s(): urb shutting down with status: %d\n", __func__, status); 819 priv->flags.write_urb_in_use = 0; 820 return; 821 default: 822 /* error in the urb, so we have to resubmit it */ 823 dev_dbg(&urb->dev->dev, "%s(): nonzero write bulk status received: %d\n", __func__, status); 824 dev_dbg(&urb->dev->dev, "%s(): overflow in write\n", __func__); 825 826 port->write_urb->transfer_buffer_length = 1; 827 result = usb_submit_urb(port->write_urb, GFP_ATOMIC); 828 if (result) { 829 dev_err_console(port, "%s(): usb_submit_urb() failed," 830 " error %d\n", __func__, result); 831 } else { 832 return; 833 } 834 } 835 836 priv->flags.write_urb_in_use = 0; 837 838 /* schedule the interrupt urb if we are still open */ 839 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__); 840 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC); 841 if (result != 0) { 842 dev_err(&port->dev, "%s(): failed submitting int urb," 843 " error %d\n", __func__, result); 844 } 845 } 846 847 module_usb_serial_driver(serial_drivers, id_table); 848 849 MODULE_DESCRIPTION(OTI6858_DESCRIPTION); 850 MODULE_AUTHOR(OTI6858_AUTHOR); 851 MODULE_LICENSE("GPL"); 852