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_setdevice(struct usb_device *dev, u8 *data) 180 { 181 u16 x = ((u16) (data[1] << 8) | (u16) (data[0])); 182 183 return qt2_control_msg(dev, QT_SET_GET_DEVICE, x, 0); 184 } 185 186 187 static inline int qt2_getregister(struct usb_device *dev, 188 u8 uart, 189 u8 reg, 190 u8 *data) 191 { 192 int ret; 193 194 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), 195 QT_SET_GET_REGISTER, 0xc0, reg, 196 uart, data, sizeof(*data), QT2_USB_TIMEOUT); 197 if (ret < (int)sizeof(*data)) { 198 if (ret >= 0) 199 ret = -EIO; 200 } 201 202 return ret; 203 } 204 205 static inline int qt2_setregister(struct usb_device *dev, 206 u8 uart, u8 reg, u16 data) 207 { 208 u16 value = (data << 8) | reg; 209 210 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), 211 QT_SET_GET_REGISTER, 0x40, value, uart, 212 NULL, 0, QT2_USB_TIMEOUT); 213 } 214 215 static inline int update_mctrl(struct qt2_port_private *port_priv, 216 unsigned int set, unsigned int clear) 217 { 218 struct usb_serial_port *port = port_priv->port; 219 struct usb_device *dev = port->serial->dev; 220 unsigned urb_value; 221 int status; 222 223 if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0) { 224 dev_dbg(&port->dev, 225 "update_mctrl - DTR|RTS not being set|cleared\n"); 226 return 0; /* no change */ 227 } 228 229 clear &= ~set; /* 'set' takes precedence over 'clear' */ 230 urb_value = 0; 231 if (set & TIOCM_DTR) 232 urb_value |= UART_MCR_DTR; 233 if (set & TIOCM_RTS) 234 urb_value |= UART_MCR_RTS; 235 236 status = qt2_setregister(dev, port_priv->device_port, UART_MCR, 237 urb_value); 238 if (status < 0) 239 dev_err(&port->dev, 240 "update_mctrl - Error from MODEM_CTRL urb: %i\n", 241 status); 242 return status; 243 } 244 245 static int qt2_calc_num_ports(struct usb_serial *serial, 246 struct usb_serial_endpoints *epds) 247 { 248 struct qt2_device_detail d; 249 int i; 250 251 for (i = 0; d = qt2_device_details[i], d.product_id != 0; i++) { 252 if (d.product_id == le16_to_cpu(serial->dev->descriptor.idProduct)) 253 return d.num_ports; 254 } 255 256 /* we didn't recognize the device */ 257 dev_err(&serial->dev->dev, 258 "don't know the number of ports, assuming 1\n"); 259 260 return 1; 261 } 262 263 static void qt2_set_termios(struct tty_struct *tty, 264 struct usb_serial_port *port, 265 struct ktermios *old_termios) 266 { 267 struct usb_device *dev = port->serial->dev; 268 struct qt2_port_private *port_priv; 269 struct ktermios *termios = &tty->termios; 270 u16 baud; 271 unsigned int cflag = termios->c_cflag; 272 u16 new_lcr = 0; 273 int status; 274 275 port_priv = usb_get_serial_port_data(port); 276 277 if (cflag & PARENB) { 278 if (cflag & PARODD) 279 new_lcr |= UART_LCR_PARITY; 280 else 281 new_lcr |= SERIAL_EVEN_PARITY; 282 } 283 284 new_lcr |= UART_LCR_WLEN(tty_get_char_size(cflag)); 285 286 baud = tty_get_baud_rate(tty); 287 if (!baud) 288 baud = 9600; 289 290 status = qt2_set_port_config(dev, port_priv->device_port, baud, 291 new_lcr); 292 if (status < 0) 293 dev_err(&port->dev, "%s - qt2_set_port_config failed: %i\n", 294 __func__, status); 295 296 if (cflag & CRTSCTS) 297 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK, 298 SERIAL_CRTSCTS, 299 port_priv->device_port); 300 else 301 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK, 302 0, port_priv->device_port); 303 if (status < 0) 304 dev_err(&port->dev, "%s - set HW flow control failed: %i\n", 305 __func__, status); 306 307 if (I_IXOFF(tty) || I_IXON(tty)) { 308 u16 x = ((u16) (START_CHAR(tty) << 8) | (u16) (STOP_CHAR(tty))); 309 310 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK, 311 x, port_priv->device_port); 312 } else 313 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK, 314 0, port_priv->device_port); 315 316 if (status < 0) 317 dev_err(&port->dev, "%s - set SW flow control failed: %i\n", 318 __func__, status); 319 320 } 321 322 static int qt2_open(struct tty_struct *tty, struct usb_serial_port *port) 323 { 324 struct usb_serial *serial; 325 struct qt2_port_private *port_priv; 326 u8 *data; 327 u16 device_port; 328 int status; 329 unsigned long flags; 330 331 device_port = port->port_number; 332 333 serial = port->serial; 334 335 port_priv = usb_get_serial_port_data(port); 336 337 /* set the port to RS232 mode */ 338 status = qt2_control_msg(serial->dev, QT2_GET_SET_QMCR, 339 QT2_QMCR_RS232, device_port); 340 if (status < 0) { 341 dev_err(&port->dev, 342 "%s failed to set RS232 mode for port %i error %i\n", 343 __func__, device_port, status); 344 return status; 345 } 346 347 data = kzalloc(2, GFP_KERNEL); 348 if (!data) 349 return -ENOMEM; 350 351 /* open the port */ 352 status = usb_control_msg(serial->dev, 353 usb_rcvctrlpipe(serial->dev, 0), 354 QT_OPEN_CLOSE_CHANNEL, 355 0xc0, 0, 356 device_port, data, 2, QT2_USB_TIMEOUT); 357 358 if (status < 2) { 359 dev_err(&port->dev, "%s - open port failed %i\n", __func__, 360 status); 361 if (status >= 0) 362 status = -EIO; 363 kfree(data); 364 return status; 365 } 366 367 spin_lock_irqsave(&port_priv->lock, flags); 368 port_priv->shadowLSR = data[0]; 369 port_priv->shadowMSR = data[1]; 370 spin_unlock_irqrestore(&port_priv->lock, flags); 371 372 kfree(data); 373 374 /* set to default speed and 8bit word size */ 375 status = qt2_set_port_config(serial->dev, device_port, 376 DEFAULT_BAUD_RATE, UART_LCR_WLEN8); 377 if (status < 0) { 378 dev_err(&port->dev, "%s - initial setup failed (%i)\n", 379 __func__, device_port); 380 return status; 381 } 382 383 port_priv->device_port = (u8) device_port; 384 385 if (tty) 386 qt2_set_termios(tty, port, &tty->termios); 387 388 return 0; 389 390 } 391 392 static void qt2_close(struct usb_serial_port *port) 393 { 394 struct usb_serial *serial; 395 struct qt2_port_private *port_priv; 396 int i; 397 398 serial = port->serial; 399 port_priv = usb_get_serial_port_data(port); 400 401 usb_kill_urb(port_priv->write_urb); 402 403 /* flush the port transmit buffer */ 404 i = usb_control_msg(serial->dev, 405 usb_sndctrlpipe(serial->dev, 0), 406 QT2_FLUSH_DEVICE, 0x40, 1, 407 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT); 408 409 if (i < 0) 410 dev_err(&port->dev, "%s - transmit buffer flush failed: %i\n", 411 __func__, i); 412 413 /* flush the port receive buffer */ 414 i = usb_control_msg(serial->dev, 415 usb_sndctrlpipe(serial->dev, 0), 416 QT2_FLUSH_DEVICE, 0x40, 0, 417 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT); 418 419 if (i < 0) 420 dev_err(&port->dev, "%s - receive buffer flush failed: %i\n", 421 __func__, i); 422 423 /* close the port */ 424 i = usb_control_msg(serial->dev, 425 usb_sndctrlpipe(serial->dev, 0), 426 QT_OPEN_CLOSE_CHANNEL, 427 0x40, 0, 428 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT); 429 430 if (i < 0) 431 dev_err(&port->dev, "%s - close port failed %i\n", 432 __func__, i); 433 } 434 435 static void qt2_disconnect(struct usb_serial *serial) 436 { 437 struct qt2_serial_private *serial_priv = usb_get_serial_data(serial); 438 439 usb_kill_urb(serial_priv->read_urb); 440 } 441 442 static void qt2_process_status(struct usb_serial_port *port, unsigned char *ch) 443 { 444 switch (*ch) { 445 case QT2_LINE_STATUS: 446 qt2_update_lsr(port, ch + 1); 447 break; 448 case QT2_MODEM_STATUS: 449 qt2_update_msr(port, ch + 1); 450 break; 451 } 452 } 453 454 static void qt2_process_read_urb(struct urb *urb) 455 { 456 struct usb_serial *serial; 457 struct qt2_serial_private *serial_priv; 458 struct usb_serial_port *port; 459 bool escapeflag; 460 unsigned char *ch; 461 int i; 462 unsigned char newport; 463 int len = urb->actual_length; 464 465 if (!len) 466 return; 467 468 ch = urb->transfer_buffer; 469 serial = urb->context; 470 serial_priv = usb_get_serial_data(serial); 471 port = serial->port[serial_priv->current_port]; 472 473 for (i = 0; i < urb->actual_length; i++) { 474 ch = (unsigned char *)urb->transfer_buffer + i; 475 if ((i <= (len - 3)) && 476 (*ch == QT2_CONTROL_BYTE) && 477 (*(ch + 1) == QT2_CONTROL_BYTE)) { 478 escapeflag = false; 479 switch (*(ch + 2)) { 480 case QT2_LINE_STATUS: 481 case QT2_MODEM_STATUS: 482 if (i > (len - 4)) { 483 dev_warn(&port->dev, 484 "%s - status message too short\n", 485 __func__); 486 break; 487 } 488 qt2_process_status(port, ch + 2); 489 i += 3; 490 escapeflag = true; 491 break; 492 case QT2_XMIT_HOLD: 493 if (i > (len - 5)) { 494 dev_warn(&port->dev, 495 "%s - xmit_empty message too short\n", 496 __func__); 497 break; 498 } 499 /* bytes_written = (ch[1] << 4) + ch[0]; */ 500 i += 4; 501 escapeflag = true; 502 break; 503 case QT2_CHANGE_PORT: 504 if (i > (len - 4)) { 505 dev_warn(&port->dev, 506 "%s - change_port message too short\n", 507 __func__); 508 break; 509 } 510 tty_flip_buffer_push(&port->port); 511 512 newport = *(ch + 3); 513 514 if (newport > serial->num_ports) { 515 dev_err(&port->dev, 516 "%s - port change to invalid port: %i\n", 517 __func__, newport); 518 break; 519 } 520 521 serial_priv->current_port = newport; 522 port = serial->port[serial_priv->current_port]; 523 i += 3; 524 escapeflag = true; 525 break; 526 case QT2_REC_FLUSH: 527 case QT2_XMIT_FLUSH: 528 i += 2; 529 escapeflag = true; 530 break; 531 case QT2_CONTROL_ESCAPE: 532 tty_insert_flip_string(&port->port, ch, 2); 533 i += 2; 534 escapeflag = true; 535 break; 536 default: 537 dev_warn(&port->dev, 538 "%s - unsupported command %i\n", 539 __func__, *(ch + 2)); 540 break; 541 } 542 if (escapeflag) 543 continue; 544 } 545 546 tty_insert_flip_char(&port->port, *ch, TTY_NORMAL); 547 } 548 549 tty_flip_buffer_push(&port->port); 550 } 551 552 static void qt2_write_bulk_callback(struct urb *urb) 553 { 554 struct usb_serial_port *port; 555 struct qt2_port_private *port_priv; 556 unsigned long flags; 557 558 port = urb->context; 559 port_priv = usb_get_serial_port_data(port); 560 561 spin_lock_irqsave(&port_priv->urb_lock, flags); 562 563 port_priv->urb_in_use = false; 564 usb_serial_port_softint(port); 565 566 spin_unlock_irqrestore(&port_priv->urb_lock, flags); 567 568 } 569 570 static void qt2_read_bulk_callback(struct urb *urb) 571 { 572 struct usb_serial *serial = urb->context; 573 int status; 574 575 if (urb->status) { 576 dev_warn(&serial->dev->dev, 577 "%s - non-zero urb status: %i\n", __func__, 578 urb->status); 579 return; 580 } 581 582 qt2_process_read_urb(urb); 583 584 status = usb_submit_urb(urb, GFP_ATOMIC); 585 if (status != 0) 586 dev_err(&serial->dev->dev, 587 "%s - resubmit read urb failed: %i\n", 588 __func__, status); 589 } 590 591 static int qt2_setup_urbs(struct usb_serial *serial) 592 { 593 struct usb_serial_port *port0; 594 struct qt2_serial_private *serial_priv; 595 int status; 596 597 port0 = serial->port[0]; 598 599 serial_priv = usb_get_serial_data(serial); 600 serial_priv->read_urb = usb_alloc_urb(0, GFP_KERNEL); 601 if (!serial_priv->read_urb) 602 return -ENOMEM; 603 604 usb_fill_bulk_urb(serial_priv->read_urb, serial->dev, 605 usb_rcvbulkpipe(serial->dev, 606 port0->bulk_in_endpointAddress), 607 serial_priv->read_buffer, 608 QT2_READ_BUFFER_SIZE, 609 qt2_read_bulk_callback, serial); 610 611 status = usb_submit_urb(serial_priv->read_urb, GFP_KERNEL); 612 if (status != 0) { 613 dev_err(&serial->dev->dev, 614 "%s - submit read urb failed %i\n", __func__, status); 615 usb_free_urb(serial_priv->read_urb); 616 return status; 617 } 618 619 return 0; 620 } 621 622 static int qt2_attach(struct usb_serial *serial) 623 { 624 struct qt2_serial_private *serial_priv; 625 int status; 626 627 /* power on unit */ 628 status = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), 629 0xc2, 0x40, 0x8000, 0, NULL, 0, 630 QT2_USB_TIMEOUT); 631 if (status < 0) { 632 dev_err(&serial->dev->dev, 633 "%s - failed to power on unit: %i\n", __func__, status); 634 return status; 635 } 636 637 serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL); 638 if (!serial_priv) 639 return -ENOMEM; 640 641 serial_priv->read_buffer = kmalloc(QT2_READ_BUFFER_SIZE, GFP_KERNEL); 642 if (!serial_priv->read_buffer) { 643 status = -ENOMEM; 644 goto err_buf; 645 } 646 647 usb_set_serial_data(serial, serial_priv); 648 649 status = qt2_setup_urbs(serial); 650 if (status != 0) 651 goto attach_failed; 652 653 return 0; 654 655 attach_failed: 656 kfree(serial_priv->read_buffer); 657 err_buf: 658 kfree(serial_priv); 659 return status; 660 } 661 662 static int qt2_port_probe(struct usb_serial_port *port) 663 { 664 struct usb_serial *serial = port->serial; 665 struct qt2_port_private *port_priv; 666 u8 bEndpointAddress; 667 668 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL); 669 if (!port_priv) 670 return -ENOMEM; 671 672 spin_lock_init(&port_priv->lock); 673 spin_lock_init(&port_priv->urb_lock); 674 port_priv->port = port; 675 676 port_priv->write_buffer = kmalloc(QT2_WRITE_BUFFER_SIZE, GFP_KERNEL); 677 if (!port_priv->write_buffer) 678 goto err_buf; 679 680 port_priv->write_urb = usb_alloc_urb(0, GFP_KERNEL); 681 if (!port_priv->write_urb) 682 goto err_urb; 683 684 bEndpointAddress = serial->port[0]->bulk_out_endpointAddress; 685 usb_fill_bulk_urb(port_priv->write_urb, serial->dev, 686 usb_sndbulkpipe(serial->dev, bEndpointAddress), 687 port_priv->write_buffer, 688 QT2_WRITE_BUFFER_SIZE, 689 qt2_write_bulk_callback, port); 690 691 usb_set_serial_port_data(port, port_priv); 692 693 return 0; 694 err_urb: 695 kfree(port_priv->write_buffer); 696 err_buf: 697 kfree(port_priv); 698 return -ENOMEM; 699 } 700 701 static void qt2_port_remove(struct usb_serial_port *port) 702 { 703 struct qt2_port_private *port_priv; 704 705 port_priv = usb_get_serial_port_data(port); 706 usb_free_urb(port_priv->write_urb); 707 kfree(port_priv->write_buffer); 708 kfree(port_priv); 709 } 710 711 static int qt2_tiocmget(struct tty_struct *tty) 712 { 713 struct usb_serial_port *port = tty->driver_data; 714 struct usb_device *dev = port->serial->dev; 715 struct qt2_port_private *port_priv = usb_get_serial_port_data(port); 716 u8 *d; 717 int r; 718 719 d = kzalloc(2, GFP_KERNEL); 720 if (!d) 721 return -ENOMEM; 722 723 r = qt2_getregister(dev, port_priv->device_port, UART_MCR, d); 724 if (r < 0) 725 goto mget_out; 726 727 r = qt2_getregister(dev, port_priv->device_port, UART_MSR, d + 1); 728 if (r < 0) 729 goto mget_out; 730 731 r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) | 732 (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) | 733 (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) | 734 (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) | 735 (d[1] & UART_MSR_RI ? TIOCM_RI : 0) | 736 (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0); 737 738 mget_out: 739 kfree(d); 740 return r; 741 } 742 743 static int qt2_tiocmset(struct tty_struct *tty, 744 unsigned int set, unsigned int clear) 745 { 746 struct qt2_port_private *port_priv; 747 748 port_priv = usb_get_serial_port_data(tty->driver_data); 749 return update_mctrl(port_priv, set, clear); 750 } 751 752 static void qt2_break_ctl(struct tty_struct *tty, int break_state) 753 { 754 struct usb_serial_port *port = tty->driver_data; 755 struct qt2_port_private *port_priv; 756 int status; 757 u16 val; 758 759 port_priv = usb_get_serial_port_data(port); 760 761 val = (break_state == -1) ? 1 : 0; 762 763 status = qt2_control_msg(port->serial->dev, QT2_BREAK_CONTROL, 764 val, port_priv->device_port); 765 if (status < 0) 766 dev_warn(&port->dev, 767 "%s - failed to send control message: %i\n", __func__, 768 status); 769 } 770 771 772 773 static void qt2_dtr_rts(struct usb_serial_port *port, int on) 774 { 775 struct usb_device *dev = port->serial->dev; 776 struct qt2_port_private *port_priv = usb_get_serial_port_data(port); 777 778 /* Disable flow control */ 779 if (!on) { 780 if (qt2_setregister(dev, port_priv->device_port, 781 UART_MCR, 0) < 0) 782 dev_warn(&port->dev, "error from flowcontrol urb\n"); 783 } 784 /* drop RTS and DTR */ 785 if (on) 786 update_mctrl(port_priv, TIOCM_DTR | TIOCM_RTS, 0); 787 else 788 update_mctrl(port_priv, 0, TIOCM_DTR | TIOCM_RTS); 789 } 790 791 static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch) 792 { 793 struct qt2_port_private *port_priv; 794 u8 newMSR = (u8) *ch; 795 unsigned long flags; 796 797 /* May be called from qt2_process_read_urb() for an unbound port. */ 798 port_priv = usb_get_serial_port_data(port); 799 if (!port_priv) 800 return; 801 802 spin_lock_irqsave(&port_priv->lock, flags); 803 port_priv->shadowMSR = newMSR; 804 spin_unlock_irqrestore(&port_priv->lock, flags); 805 806 if (newMSR & UART_MSR_ANY_DELTA) { 807 /* update input line counters */ 808 if (newMSR & UART_MSR_DCTS) 809 port->icount.cts++; 810 if (newMSR & UART_MSR_DDSR) 811 port->icount.dsr++; 812 if (newMSR & UART_MSR_DDCD) 813 port->icount.dcd++; 814 if (newMSR & UART_MSR_TERI) 815 port->icount.rng++; 816 817 wake_up_interruptible(&port->port.delta_msr_wait); 818 } 819 } 820 821 static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch) 822 { 823 struct qt2_port_private *port_priv; 824 struct async_icount *icount; 825 unsigned long flags; 826 u8 newLSR = (u8) *ch; 827 828 /* May be called from qt2_process_read_urb() for an unbound port. */ 829 port_priv = usb_get_serial_port_data(port); 830 if (!port_priv) 831 return; 832 833 if (newLSR & UART_LSR_BI) 834 newLSR &= (u8) (UART_LSR_OE | UART_LSR_BI); 835 836 spin_lock_irqsave(&port_priv->lock, flags); 837 port_priv->shadowLSR = newLSR; 838 spin_unlock_irqrestore(&port_priv->lock, flags); 839 840 icount = &port->icount; 841 842 if (newLSR & UART_LSR_BRK_ERROR_BITS) { 843 844 if (newLSR & UART_LSR_BI) 845 icount->brk++; 846 847 if (newLSR & UART_LSR_OE) 848 icount->overrun++; 849 850 if (newLSR & UART_LSR_PE) 851 icount->parity++; 852 853 if (newLSR & UART_LSR_FE) 854 icount->frame++; 855 } 856 857 } 858 859 static unsigned int qt2_write_room(struct tty_struct *tty) 860 { 861 struct usb_serial_port *port = tty->driver_data; 862 struct qt2_port_private *port_priv; 863 unsigned long flags; 864 unsigned int r; 865 866 port_priv = usb_get_serial_port_data(port); 867 868 spin_lock_irqsave(&port_priv->urb_lock, flags); 869 870 if (port_priv->urb_in_use) 871 r = 0; 872 else 873 r = QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE; 874 875 spin_unlock_irqrestore(&port_priv->urb_lock, flags); 876 877 return r; 878 } 879 880 static int qt2_write(struct tty_struct *tty, 881 struct usb_serial_port *port, 882 const unsigned char *buf, int count) 883 { 884 struct qt2_port_private *port_priv; 885 struct urb *write_urb; 886 unsigned char *data; 887 unsigned long flags; 888 int status; 889 int bytes_out = 0; 890 891 port_priv = usb_get_serial_port_data(port); 892 893 if (port_priv->write_urb == NULL) { 894 dev_err(&port->dev, "%s - no output urb\n", __func__); 895 return 0; 896 } 897 write_urb = port_priv->write_urb; 898 899 count = min(count, QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE); 900 901 data = write_urb->transfer_buffer; 902 spin_lock_irqsave(&port_priv->urb_lock, flags); 903 if (port_priv->urb_in_use) { 904 dev_err(&port->dev, "qt2_write - urb is in use\n"); 905 goto write_out; 906 } 907 908 *data++ = QT2_CONTROL_BYTE; 909 *data++ = QT2_CONTROL_BYTE; 910 *data++ = port_priv->device_port; 911 put_unaligned_le16(count, data); 912 data += 2; 913 memcpy(data, buf, count); 914 915 write_urb->transfer_buffer_length = count + QT2_WRITE_CONTROL_SIZE; 916 917 status = usb_submit_urb(write_urb, GFP_ATOMIC); 918 if (status == 0) { 919 port_priv->urb_in_use = true; 920 bytes_out += count; 921 } 922 923 write_out: 924 spin_unlock_irqrestore(&port_priv->urb_lock, flags); 925 return bytes_out; 926 } 927 928 929 static struct usb_serial_driver qt2_device = { 930 .driver = { 931 .owner = THIS_MODULE, 932 .name = "quatech-serial", 933 }, 934 .description = DRIVER_DESC, 935 .id_table = id_table, 936 .open = qt2_open, 937 .close = qt2_close, 938 .write = qt2_write, 939 .write_room = qt2_write_room, 940 .calc_num_ports = qt2_calc_num_ports, 941 .attach = qt2_attach, 942 .release = qt2_release, 943 .disconnect = qt2_disconnect, 944 .port_probe = qt2_port_probe, 945 .port_remove = qt2_port_remove, 946 .dtr_rts = qt2_dtr_rts, 947 .break_ctl = qt2_break_ctl, 948 .tiocmget = qt2_tiocmget, 949 .tiocmset = qt2_tiocmset, 950 .tiocmiwait = usb_serial_generic_tiocmiwait, 951 .get_icount = usb_serial_generic_get_icount, 952 .set_termios = qt2_set_termios, 953 }; 954 955 static struct usb_serial_driver *const serial_drivers[] = { 956 &qt2_device, NULL 957 }; 958 959 module_usb_serial_driver(serial_drivers, id_table); 960 961 MODULE_DESCRIPTION(DRIVER_DESC); 962 MODULE_LICENSE("GPL v2"); 963