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