1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * usb-serial driver for Quatech USB 2 devices 4 * 5 * Copyright (C) 2012 Bill Pemberton (wfp5p@virginia.edu) 6 * 7 * These devices all have only 1 bulk in and 1 bulk out that is shared 8 * for all serial ports. 9 * 10 */ 11 12 #include <linux/unaligned.h> 13 #include <linux/errno.h> 14 #include <linux/slab.h> 15 #include <linux/tty.h> 16 #include <linux/tty_flip.h> 17 #include <linux/module.h> 18 #include <linux/serial.h> 19 #include <linux/usb.h> 20 #include <linux/usb/serial.h> 21 #include <linux/serial_reg.h> 22 23 /* default urb timeout for usb operations */ 24 #define QT2_USB_TIMEOUT USB_CTRL_SET_TIMEOUT 25 26 #define QT_OPEN_CLOSE_CHANNEL 0xca 27 #define QT_SET_GET_DEVICE 0xc2 28 #define QT_SET_GET_REGISTER 0xc0 29 #define QT_GET_SET_PREBUF_TRIG_LVL 0xcc 30 #define QT_SET_ATF 0xcd 31 #define QT_TRANSFER_IN 0xc0 32 #define QT_HW_FLOW_CONTROL_MASK 0xc5 33 #define QT_SW_FLOW_CONTROL_MASK 0xc6 34 #define QT2_BREAK_CONTROL 0xc8 35 #define QT2_GET_SET_UART 0xc1 36 #define QT2_FLUSH_DEVICE 0xc4 37 #define QT2_GET_SET_QMCR 0xe1 38 #define QT2_QMCR_RS232 0x40 39 #define QT2_QMCR_RS422 0x10 40 41 #define SERIAL_CRTSCTS ((UART_MCR_RTS << 8) | UART_MSR_CTS) 42 43 #define SERIAL_EVEN_PARITY (UART_LCR_PARITY | UART_LCR_EPAR) 44 45 /* status bytes for the device */ 46 #define QT2_CONTROL_BYTE 0x1b 47 #define QT2_LINE_STATUS 0x00 /* following 1 byte is line status */ 48 #define QT2_MODEM_STATUS 0x01 /* following 1 byte is modem status */ 49 #define QT2_XMIT_HOLD 0x02 /* following 2 bytes are ?? */ 50 #define QT2_CHANGE_PORT 0x03 /* following 1 byte is port to change to */ 51 #define QT2_REC_FLUSH 0x04 /* no following info */ 52 #define QT2_XMIT_FLUSH 0x05 /* no following info */ 53 #define QT2_CONTROL_ESCAPE 0xff /* pass through previous 2 control bytes */ 54 55 #define MIN_BAUD_RATE 50 56 #define MAX_BAUD_RATE 921600 57 #define DEFAULT_BAUD_RATE 9600 58 59 #define QT2_READ_BUFFER_SIZE 512 /* size of read buffer */ 60 #define QT2_WRITE_BUFFER_SIZE 512 /* size of write buffer */ 61 #define QT2_WRITE_CONTROL_SIZE 5 /* control bytes used for a write */ 62 63 #define DRIVER_DESC "Quatech 2nd gen USB to Serial Driver" 64 65 #define USB_VENDOR_ID_QUATECH 0x061d 66 #define QUATECH_SSU2_100 0xC120 /* RS232 single port */ 67 #define QUATECH_DSU2_100 0xC140 /* RS232 dual port */ 68 #define QUATECH_DSU2_400 0xC150 /* RS232/422/485 dual port */ 69 #define QUATECH_QSU2_100 0xC160 /* RS232 four port */ 70 #define QUATECH_QSU2_400 0xC170 /* RS232/422/485 four port */ 71 #define QUATECH_ESU2_100 0xC1A0 /* RS232 eight port */ 72 #define QUATECH_ESU2_400 0xC180 /* RS232/422/485 eight port */ 73 74 struct qt2_device_detail { 75 int product_id; 76 int num_ports; 77 }; 78 79 #define QT_DETAILS(prod, ports) \ 80 .product_id = (prod), \ 81 .num_ports = (ports) 82 83 static const struct qt2_device_detail qt2_device_details[] = { 84 {QT_DETAILS(QUATECH_SSU2_100, 1)}, 85 {QT_DETAILS(QUATECH_DSU2_400, 2)}, 86 {QT_DETAILS(QUATECH_DSU2_100, 2)}, 87 {QT_DETAILS(QUATECH_QSU2_400, 4)}, 88 {QT_DETAILS(QUATECH_QSU2_100, 4)}, 89 {QT_DETAILS(QUATECH_ESU2_400, 8)}, 90 {QT_DETAILS(QUATECH_ESU2_100, 8)}, 91 {QT_DETAILS(0, 0)} /* Terminating entry */ 92 }; 93 94 static const struct usb_device_id id_table[] = { 95 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_SSU2_100)}, 96 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU2_100)}, 97 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU2_400)}, 98 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU2_100)}, 99 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU2_400)}, 100 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU2_100)}, 101 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU2_400)}, 102 {} /* Terminating entry */ 103 }; 104 MODULE_DEVICE_TABLE(usb, id_table); 105 106 struct qt2_serial_private { 107 unsigned char current_port; /* current port for incoming data */ 108 109 struct urb *read_urb; /* shared among all ports */ 110 char *read_buffer; 111 }; 112 113 struct qt2_port_private { 114 u8 device_port; 115 116 spinlock_t urb_lock; 117 bool urb_in_use; 118 struct urb *write_urb; 119 char *write_buffer; 120 121 spinlock_t lock; 122 u8 shadowLSR; 123 u8 shadowMSR; 124 125 struct usb_serial_port *port; 126 }; 127 128 static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch); 129 static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch); 130 static void qt2_write_bulk_callback(struct urb *urb); 131 static void qt2_read_bulk_callback(struct urb *urb); 132 133 static void qt2_release(struct usb_serial *serial) 134 { 135 struct qt2_serial_private *serial_priv; 136 137 serial_priv = usb_get_serial_data(serial); 138 139 usb_kill_urb(serial_priv->read_urb); 140 usb_free_urb(serial_priv->read_urb); 141 kfree(serial_priv->read_buffer); 142 kfree(serial_priv); 143 } 144 145 static inline int calc_baud_divisor(int baudrate) 146 { 147 int divisor, rem; 148 149 divisor = MAX_BAUD_RATE / baudrate; 150 rem = MAX_BAUD_RATE % baudrate; 151 /* Round to nearest divisor */ 152 if (((rem * 2) >= baudrate) && (baudrate != 110)) 153 divisor++; 154 155 return divisor; 156 } 157 158 static inline int qt2_set_port_config(struct usb_device *dev, 159 unsigned char port_number, 160 speed_t baudrate, u16 lcr) 161 { 162 int divisor = calc_baud_divisor(baudrate); 163 u16 index = ((u16) (lcr << 8) | (u16) (port_number)); 164 165 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), 166 QT2_GET_SET_UART, 0x40, 167 divisor, index, NULL, 0, QT2_USB_TIMEOUT); 168 } 169 170 static inline int qt2_control_msg(struct usb_device *dev, 171 u8 request, u16 data, u16 index) 172 { 173 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), 174 request, 0x40, data, index, 175 NULL, 0, QT2_USB_TIMEOUT); 176 } 177 178 static inline int qt2_getregister(struct usb_device *dev, 179 u8 uart, 180 u8 reg, 181 u8 *data) 182 { 183 int ret; 184 185 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), 186 QT_SET_GET_REGISTER, 0xc0, reg, 187 uart, data, sizeof(*data), QT2_USB_TIMEOUT); 188 if (ret < (int)sizeof(*data)) { 189 if (ret >= 0) 190 ret = -EIO; 191 } 192 193 return ret; 194 } 195 196 static inline int qt2_setregister(struct usb_device *dev, 197 u8 uart, u8 reg, u16 data) 198 { 199 u16 value = (data << 8) | reg; 200 201 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), 202 QT_SET_GET_REGISTER, 0x40, value, uart, 203 NULL, 0, QT2_USB_TIMEOUT); 204 } 205 206 static inline int update_mctrl(struct qt2_port_private *port_priv, 207 unsigned int set, unsigned int clear) 208 { 209 struct usb_serial_port *port = port_priv->port; 210 struct usb_device *dev = port->serial->dev; 211 unsigned urb_value; 212 int status; 213 214 if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0) { 215 dev_dbg(&port->dev, 216 "update_mctrl - DTR|RTS not being set|cleared\n"); 217 return 0; /* no change */ 218 } 219 220 clear &= ~set; /* 'set' takes precedence over 'clear' */ 221 urb_value = 0; 222 if (set & TIOCM_DTR) 223 urb_value |= UART_MCR_DTR; 224 if (set & TIOCM_RTS) 225 urb_value |= UART_MCR_RTS; 226 227 status = qt2_setregister(dev, port_priv->device_port, UART_MCR, 228 urb_value); 229 if (status < 0) 230 dev_err(&port->dev, 231 "update_mctrl - Error from MODEM_CTRL urb: %i\n", 232 status); 233 return status; 234 } 235 236 static int qt2_calc_num_ports(struct usb_serial *serial, 237 struct usb_serial_endpoints *epds) 238 { 239 struct qt2_device_detail d; 240 int i; 241 242 for (i = 0; d = qt2_device_details[i], d.product_id != 0; i++) { 243 if (d.product_id == le16_to_cpu(serial->dev->descriptor.idProduct)) 244 return d.num_ports; 245 } 246 247 /* we didn't recognize the device */ 248 dev_err(&serial->dev->dev, 249 "don't know the number of ports, assuming 1\n"); 250 251 return 1; 252 } 253 254 static void qt2_set_termios(struct tty_struct *tty, 255 struct usb_serial_port *port, 256 const struct ktermios *old_termios) 257 { 258 struct usb_device *dev = port->serial->dev; 259 struct qt2_port_private *port_priv; 260 struct ktermios *termios = &tty->termios; 261 unsigned int cflag = termios->c_cflag; 262 u16 new_lcr = 0; 263 speed_t baud; 264 int status; 265 266 port_priv = usb_get_serial_port_data(port); 267 268 if (cflag & PARENB) { 269 if (cflag & PARODD) 270 new_lcr |= UART_LCR_PARITY; 271 else 272 new_lcr |= SERIAL_EVEN_PARITY; 273 } 274 275 new_lcr |= UART_LCR_WLEN(tty_get_char_size(cflag)); 276 277 baud = tty_get_baud_rate(tty); 278 if (!baud) 279 baud = 9600; 280 281 if (baud < MIN_BAUD_RATE || baud > MAX_BAUD_RATE) { 282 if (old_termios) 283 baud = tty_termios_baud_rate(old_termios); 284 else 285 baud = clamp(baud, MIN_BAUD_RATE, MAX_BAUD_RATE); 286 287 tty_encode_baud_rate(tty, baud, baud); 288 289 if (!baud) 290 baud = 9600; 291 } 292 293 status = qt2_set_port_config(dev, port_priv->device_port, baud, 294 new_lcr); 295 if (status < 0) 296 dev_err(&port->dev, "%s - qt2_set_port_config failed: %i\n", 297 __func__, status); 298 299 if (cflag & CRTSCTS) 300 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK, 301 SERIAL_CRTSCTS, 302 port_priv->device_port); 303 else 304 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK, 305 0, port_priv->device_port); 306 if (status < 0) 307 dev_err(&port->dev, "%s - set HW flow control failed: %i\n", 308 __func__, status); 309 310 if (I_IXOFF(tty) || I_IXON(tty)) { 311 u16 x = ((u16) (START_CHAR(tty) << 8) | (u16) (STOP_CHAR(tty))); 312 313 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK, 314 x, port_priv->device_port); 315 } else 316 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK, 317 0, port_priv->device_port); 318 319 if (status < 0) 320 dev_err(&port->dev, "%s - set SW flow control failed: %i\n", 321 __func__, status); 322 323 } 324 325 static int qt2_open(struct tty_struct *tty, struct usb_serial_port *port) 326 { 327 struct usb_serial *serial; 328 struct qt2_port_private *port_priv; 329 u8 *data; 330 u16 device_port; 331 int status; 332 unsigned long flags; 333 334 device_port = port->port_number; 335 336 serial = port->serial; 337 338 port_priv = usb_get_serial_port_data(port); 339 340 /* set the port to RS232 mode */ 341 status = qt2_control_msg(serial->dev, QT2_GET_SET_QMCR, 342 QT2_QMCR_RS232, device_port); 343 if (status < 0) { 344 dev_err(&port->dev, 345 "%s failed to set RS232 mode for port %i error %i\n", 346 __func__, device_port, status); 347 return status; 348 } 349 350 data = kzalloc(2, GFP_KERNEL); 351 if (!data) 352 return -ENOMEM; 353 354 /* open the port */ 355 status = usb_control_msg(serial->dev, 356 usb_rcvctrlpipe(serial->dev, 0), 357 QT_OPEN_CLOSE_CHANNEL, 358 0xc0, 0, 359 device_port, data, 2, QT2_USB_TIMEOUT); 360 361 if (status < 2) { 362 dev_err(&port->dev, "%s - open port failed %i\n", __func__, 363 status); 364 if (status >= 0) 365 status = -EIO; 366 kfree(data); 367 return status; 368 } 369 370 spin_lock_irqsave(&port_priv->lock, flags); 371 port_priv->shadowLSR = data[0]; 372 port_priv->shadowMSR = data[1]; 373 spin_unlock_irqrestore(&port_priv->lock, flags); 374 375 kfree(data); 376 377 /* set to default speed and 8bit word size */ 378 status = qt2_set_port_config(serial->dev, device_port, 379 DEFAULT_BAUD_RATE, UART_LCR_WLEN8); 380 if (status < 0) { 381 dev_err(&port->dev, "%s - initial setup failed (%i)\n", 382 __func__, device_port); 383 return status; 384 } 385 386 port_priv->device_port = (u8) device_port; 387 388 if (tty) 389 qt2_set_termios(tty, port, NULL); 390 391 return 0; 392 393 } 394 395 static void qt2_close(struct usb_serial_port *port) 396 { 397 struct usb_serial *serial; 398 struct qt2_port_private *port_priv; 399 int i; 400 401 serial = port->serial; 402 port_priv = usb_get_serial_port_data(port); 403 404 usb_kill_urb(port_priv->write_urb); 405 406 /* flush the port transmit buffer */ 407 i = usb_control_msg(serial->dev, 408 usb_sndctrlpipe(serial->dev, 0), 409 QT2_FLUSH_DEVICE, 0x40, 1, 410 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT); 411 412 if (i < 0) 413 dev_err(&port->dev, "%s - transmit buffer flush failed: %i\n", 414 __func__, i); 415 416 /* flush the port receive buffer */ 417 i = usb_control_msg(serial->dev, 418 usb_sndctrlpipe(serial->dev, 0), 419 QT2_FLUSH_DEVICE, 0x40, 0, 420 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT); 421 422 if (i < 0) 423 dev_err(&port->dev, "%s - receive buffer flush failed: %i\n", 424 __func__, i); 425 426 /* close the port */ 427 i = usb_control_msg(serial->dev, 428 usb_sndctrlpipe(serial->dev, 0), 429 QT_OPEN_CLOSE_CHANNEL, 430 0x40, 0, 431 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT); 432 433 if (i < 0) 434 dev_err(&port->dev, "%s - close port failed %i\n", 435 __func__, i); 436 } 437 438 static void qt2_disconnect(struct usb_serial *serial) 439 { 440 struct qt2_serial_private *serial_priv = usb_get_serial_data(serial); 441 442 usb_kill_urb(serial_priv->read_urb); 443 } 444 445 static void qt2_process_status(struct usb_serial_port *port, unsigned char *ch) 446 { 447 switch (*ch) { 448 case QT2_LINE_STATUS: 449 qt2_update_lsr(port, ch + 1); 450 break; 451 case QT2_MODEM_STATUS: 452 qt2_update_msr(port, ch + 1); 453 break; 454 } 455 } 456 457 static void qt2_process_read_urb(struct urb *urb) 458 { 459 struct usb_serial *serial; 460 struct qt2_serial_private *serial_priv; 461 struct usb_serial_port *port; 462 bool escapeflag; 463 unsigned char *ch; 464 int i; 465 unsigned char newport; 466 int len = urb->actual_length; 467 468 if (!len) 469 return; 470 471 ch = urb->transfer_buffer; 472 serial = urb->context; 473 serial_priv = usb_get_serial_data(serial); 474 port = serial->port[serial_priv->current_port]; 475 476 for (i = 0; i < urb->actual_length; i++) { 477 ch = (unsigned char *)urb->transfer_buffer + i; 478 if ((i <= (len - 3)) && 479 (*ch == QT2_CONTROL_BYTE) && 480 (*(ch + 1) == QT2_CONTROL_BYTE)) { 481 escapeflag = false; 482 switch (*(ch + 2)) { 483 case QT2_LINE_STATUS: 484 case QT2_MODEM_STATUS: 485 if (i > (len - 4)) { 486 dev_warn(&port->dev, 487 "%s - status message too short\n", 488 __func__); 489 break; 490 } 491 qt2_process_status(port, ch + 2); 492 i += 3; 493 escapeflag = true; 494 break; 495 case QT2_XMIT_HOLD: 496 if (i > (len - 5)) { 497 dev_warn(&port->dev, 498 "%s - xmit_empty message too short\n", 499 __func__); 500 break; 501 } 502 /* bytes_written = (ch[1] << 4) + ch[0]; */ 503 i += 4; 504 escapeflag = true; 505 break; 506 case QT2_CHANGE_PORT: 507 if (i > (len - 4)) { 508 dev_warn(&port->dev, 509 "%s - change_port message too short\n", 510 __func__); 511 break; 512 } 513 tty_flip_buffer_push(&port->port); 514 515 newport = *(ch + 3); 516 517 if (newport >= serial->num_ports) { 518 dev_err(&port->dev, 519 "%s - port change to invalid port: %i\n", 520 __func__, newport); 521 break; 522 } 523 524 serial_priv->current_port = newport; 525 port = serial->port[serial_priv->current_port]; 526 i += 3; 527 escapeflag = true; 528 break; 529 case QT2_REC_FLUSH: 530 case QT2_XMIT_FLUSH: 531 i += 2; 532 escapeflag = true; 533 break; 534 case QT2_CONTROL_ESCAPE: 535 tty_insert_flip_string(&port->port, ch, 2); 536 i += 2; 537 escapeflag = true; 538 break; 539 default: 540 dev_warn(&port->dev, 541 "%s - unsupported command %i\n", 542 __func__, *(ch + 2)); 543 break; 544 } 545 if (escapeflag) 546 continue; 547 } 548 549 tty_insert_flip_char(&port->port, *ch, TTY_NORMAL); 550 } 551 552 tty_flip_buffer_push(&port->port); 553 } 554 555 static void qt2_write_bulk_callback(struct urb *urb) 556 { 557 struct usb_serial_port *port; 558 struct qt2_port_private *port_priv; 559 unsigned long flags; 560 561 port = urb->context; 562 port_priv = usb_get_serial_port_data(port); 563 564 spin_lock_irqsave(&port_priv->urb_lock, flags); 565 566 port_priv->urb_in_use = false; 567 usb_serial_port_softint(port); 568 569 spin_unlock_irqrestore(&port_priv->urb_lock, flags); 570 571 } 572 573 static void qt2_read_bulk_callback(struct urb *urb) 574 { 575 struct usb_serial *serial = urb->context; 576 int status; 577 578 if (urb->status) { 579 dev_warn(&serial->dev->dev, 580 "%s - non-zero urb status: %i\n", __func__, 581 urb->status); 582 return; 583 } 584 585 qt2_process_read_urb(urb); 586 587 status = usb_submit_urb(urb, GFP_ATOMIC); 588 if (status != 0) 589 dev_err(&serial->dev->dev, 590 "%s - resubmit read urb failed: %i\n", 591 __func__, status); 592 } 593 594 static int qt2_setup_urbs(struct usb_serial *serial) 595 { 596 struct usb_serial_port *port0; 597 struct qt2_serial_private *serial_priv; 598 int status; 599 600 port0 = serial->port[0]; 601 602 serial_priv = usb_get_serial_data(serial); 603 serial_priv->read_urb = usb_alloc_urb(0, GFP_KERNEL); 604 if (!serial_priv->read_urb) 605 return -ENOMEM; 606 607 usb_fill_bulk_urb(serial_priv->read_urb, serial->dev, 608 usb_rcvbulkpipe(serial->dev, 609 port0->bulk_in_endpointAddress), 610 serial_priv->read_buffer, 611 QT2_READ_BUFFER_SIZE, 612 qt2_read_bulk_callback, serial); 613 614 status = usb_submit_urb(serial_priv->read_urb, GFP_KERNEL); 615 if (status != 0) { 616 dev_err(&serial->dev->dev, 617 "%s - submit read urb failed %i\n", __func__, status); 618 usb_free_urb(serial_priv->read_urb); 619 return status; 620 } 621 622 return 0; 623 } 624 625 static int qt2_attach(struct usb_serial *serial) 626 { 627 struct qt2_serial_private *serial_priv; 628 int status; 629 630 /* power on unit */ 631 status = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 632 0xc2, 0x40, 0x8000, 0, NULL, 0, 633 QT2_USB_TIMEOUT); 634 if (status < 0) { 635 dev_err(&serial->dev->dev, 636 "%s - failed to power on unit: %i\n", __func__, status); 637 return status; 638 } 639 640 serial_priv = kzalloc_obj(*serial_priv); 641 if (!serial_priv) 642 return -ENOMEM; 643 644 serial_priv->read_buffer = kmalloc(QT2_READ_BUFFER_SIZE, GFP_KERNEL); 645 if (!serial_priv->read_buffer) { 646 status = -ENOMEM; 647 goto err_buf; 648 } 649 650 usb_set_serial_data(serial, serial_priv); 651 652 status = qt2_setup_urbs(serial); 653 if (status != 0) 654 goto attach_failed; 655 656 return 0; 657 658 attach_failed: 659 kfree(serial_priv->read_buffer); 660 err_buf: 661 kfree(serial_priv); 662 return status; 663 } 664 665 static int qt2_port_probe(struct usb_serial_port *port) 666 { 667 struct usb_serial *serial = port->serial; 668 struct qt2_port_private *port_priv; 669 u8 bEndpointAddress; 670 671 port_priv = kzalloc_obj(*port_priv); 672 if (!port_priv) 673 return -ENOMEM; 674 675 spin_lock_init(&port_priv->lock); 676 spin_lock_init(&port_priv->urb_lock); 677 port_priv->port = port; 678 679 port_priv->write_buffer = kmalloc(QT2_WRITE_BUFFER_SIZE, GFP_KERNEL); 680 if (!port_priv->write_buffer) 681 goto err_buf; 682 683 port_priv->write_urb = usb_alloc_urb(0, GFP_KERNEL); 684 if (!port_priv->write_urb) 685 goto err_urb; 686 687 bEndpointAddress = serial->port[0]->bulk_out_endpointAddress; 688 usb_fill_bulk_urb(port_priv->write_urb, serial->dev, 689 usb_sndbulkpipe(serial->dev, bEndpointAddress), 690 port_priv->write_buffer, 691 QT2_WRITE_BUFFER_SIZE, 692 qt2_write_bulk_callback, port); 693 694 usb_set_serial_port_data(port, port_priv); 695 696 return 0; 697 err_urb: 698 kfree(port_priv->write_buffer); 699 err_buf: 700 kfree(port_priv); 701 return -ENOMEM; 702 } 703 704 static void qt2_port_remove(struct usb_serial_port *port) 705 { 706 struct qt2_port_private *port_priv; 707 708 port_priv = usb_get_serial_port_data(port); 709 usb_free_urb(port_priv->write_urb); 710 kfree(port_priv->write_buffer); 711 kfree(port_priv); 712 } 713 714 static int qt2_tiocmget(struct tty_struct *tty) 715 { 716 struct usb_serial_port *port = tty->driver_data; 717 struct usb_device *dev = port->serial->dev; 718 struct qt2_port_private *port_priv = usb_get_serial_port_data(port); 719 u8 *d; 720 int r; 721 722 d = kzalloc(2, GFP_KERNEL); 723 if (!d) 724 return -ENOMEM; 725 726 r = qt2_getregister(dev, port_priv->device_port, UART_MCR, d); 727 if (r < 0) 728 goto mget_out; 729 730 r = qt2_getregister(dev, port_priv->device_port, UART_MSR, d + 1); 731 if (r < 0) 732 goto mget_out; 733 734 r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) | 735 (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) | 736 (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) | 737 (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) | 738 (d[1] & UART_MSR_RI ? TIOCM_RI : 0) | 739 (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0); 740 741 mget_out: 742 kfree(d); 743 return r; 744 } 745 746 static int qt2_tiocmset(struct tty_struct *tty, 747 unsigned int set, unsigned int clear) 748 { 749 struct qt2_port_private *port_priv; 750 751 port_priv = usb_get_serial_port_data(tty->driver_data); 752 return update_mctrl(port_priv, set, clear); 753 } 754 755 static int qt2_break_ctl(struct tty_struct *tty, int break_state) 756 { 757 struct usb_serial_port *port = tty->driver_data; 758 struct qt2_port_private *port_priv; 759 int status; 760 u16 val; 761 762 port_priv = usb_get_serial_port_data(port); 763 764 val = (break_state == -1) ? 1 : 0; 765 766 status = qt2_control_msg(port->serial->dev, QT2_BREAK_CONTROL, 767 val, port_priv->device_port); 768 if (status < 0) { 769 dev_warn(&port->dev, 770 "%s - failed to send control message: %i\n", __func__, 771 status); 772 return status; 773 } 774 775 return 0; 776 } 777 778 779 780 static void qt2_dtr_rts(struct usb_serial_port *port, int on) 781 { 782 struct usb_device *dev = port->serial->dev; 783 struct qt2_port_private *port_priv = usb_get_serial_port_data(port); 784 785 /* Disable flow control */ 786 if (!on) { 787 if (qt2_setregister(dev, port_priv->device_port, 788 UART_MCR, 0) < 0) 789 dev_warn(&port->dev, "error from flowcontrol urb\n"); 790 } 791 /* drop RTS and DTR */ 792 if (on) 793 update_mctrl(port_priv, TIOCM_DTR | TIOCM_RTS, 0); 794 else 795 update_mctrl(port_priv, 0, TIOCM_DTR | TIOCM_RTS); 796 } 797 798 static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch) 799 { 800 struct qt2_port_private *port_priv; 801 u8 newMSR = (u8) *ch; 802 unsigned long flags; 803 804 /* May be called from qt2_process_read_urb() for an unbound port. */ 805 port_priv = usb_get_serial_port_data(port); 806 if (!port_priv) 807 return; 808 809 spin_lock_irqsave(&port_priv->lock, flags); 810 port_priv->shadowMSR = newMSR; 811 spin_unlock_irqrestore(&port_priv->lock, flags); 812 813 if (newMSR & UART_MSR_ANY_DELTA) { 814 /* update input line counters */ 815 if (newMSR & UART_MSR_DCTS) 816 port->icount.cts++; 817 if (newMSR & UART_MSR_DDSR) 818 port->icount.dsr++; 819 if (newMSR & UART_MSR_DDCD) 820 port->icount.dcd++; 821 if (newMSR & UART_MSR_TERI) 822 port->icount.rng++; 823 824 wake_up_interruptible(&port->port.delta_msr_wait); 825 } 826 } 827 828 static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch) 829 { 830 struct qt2_port_private *port_priv; 831 struct async_icount *icount; 832 unsigned long flags; 833 u8 newLSR = (u8) *ch; 834 835 /* May be called from qt2_process_read_urb() for an unbound port. */ 836 port_priv = usb_get_serial_port_data(port); 837 if (!port_priv) 838 return; 839 840 if (newLSR & UART_LSR_BI) 841 newLSR &= (u8) (UART_LSR_OE | UART_LSR_BI); 842 843 spin_lock_irqsave(&port_priv->lock, flags); 844 port_priv->shadowLSR = newLSR; 845 spin_unlock_irqrestore(&port_priv->lock, flags); 846 847 icount = &port->icount; 848 849 if (newLSR & UART_LSR_BRK_ERROR_BITS) { 850 851 if (newLSR & UART_LSR_BI) 852 icount->brk++; 853 854 if (newLSR & UART_LSR_OE) 855 icount->overrun++; 856 857 if (newLSR & UART_LSR_PE) 858 icount->parity++; 859 860 if (newLSR & UART_LSR_FE) 861 icount->frame++; 862 } 863 864 } 865 866 static unsigned int qt2_write_room(struct tty_struct *tty) 867 { 868 struct usb_serial_port *port = tty->driver_data; 869 struct qt2_port_private *port_priv; 870 unsigned long flags; 871 unsigned int r; 872 873 port_priv = usb_get_serial_port_data(port); 874 875 spin_lock_irqsave(&port_priv->urb_lock, flags); 876 877 if (port_priv->urb_in_use) 878 r = 0; 879 else 880 r = QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE; 881 882 spin_unlock_irqrestore(&port_priv->urb_lock, flags); 883 884 return r; 885 } 886 887 static int qt2_write(struct tty_struct *tty, 888 struct usb_serial_port *port, 889 const unsigned char *buf, int count) 890 { 891 struct qt2_port_private *port_priv; 892 struct urb *write_urb; 893 unsigned char *data; 894 unsigned long flags; 895 int status; 896 int bytes_out = 0; 897 898 port_priv = usb_get_serial_port_data(port); 899 900 if (port_priv->write_urb == NULL) { 901 dev_err(&port->dev, "%s - no output urb\n", __func__); 902 return 0; 903 } 904 write_urb = port_priv->write_urb; 905 906 count = min(count, QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE); 907 908 data = write_urb->transfer_buffer; 909 spin_lock_irqsave(&port_priv->urb_lock, flags); 910 if (port_priv->urb_in_use) { 911 dev_err(&port->dev, "qt2_write - urb is in use\n"); 912 goto write_out; 913 } 914 915 *data++ = QT2_CONTROL_BYTE; 916 *data++ = QT2_CONTROL_BYTE; 917 *data++ = port_priv->device_port; 918 put_unaligned_le16(count, data); 919 data += 2; 920 memcpy(data, buf, count); 921 922 write_urb->transfer_buffer_length = count + QT2_WRITE_CONTROL_SIZE; 923 924 status = usb_submit_urb(write_urb, GFP_ATOMIC); 925 if (status == 0) { 926 port_priv->urb_in_use = true; 927 bytes_out += count; 928 } 929 930 write_out: 931 spin_unlock_irqrestore(&port_priv->urb_lock, flags); 932 return bytes_out; 933 } 934 935 936 static struct usb_serial_driver qt2_device = { 937 .driver = { 938 .name = "quatech-serial", 939 }, 940 .description = DRIVER_DESC, 941 .id_table = id_table, 942 .open = qt2_open, 943 .close = qt2_close, 944 .write = qt2_write, 945 .write_room = qt2_write_room, 946 .calc_num_ports = qt2_calc_num_ports, 947 .attach = qt2_attach, 948 .release = qt2_release, 949 .disconnect = qt2_disconnect, 950 .port_probe = qt2_port_probe, 951 .port_remove = qt2_port_remove, 952 .dtr_rts = qt2_dtr_rts, 953 .break_ctl = qt2_break_ctl, 954 .tiocmget = qt2_tiocmget, 955 .tiocmset = qt2_tiocmset, 956 .tiocmiwait = usb_serial_generic_tiocmiwait, 957 .get_icount = usb_serial_generic_get_icount, 958 .set_termios = qt2_set_termios, 959 }; 960 961 static struct usb_serial_driver *const serial_drivers[] = { 962 &qt2_device, NULL 963 }; 964 965 module_usb_serial_driver(serial_drivers, id_table); 966 967 MODULE_DESCRIPTION(DRIVER_DESC); 968 MODULE_LICENSE("GPL v2"); 969