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 switch (cflag & CSIZE) { 285 case CS5: 286 new_lcr |= UART_LCR_WLEN5; 287 break; 288 case CS6: 289 new_lcr |= UART_LCR_WLEN6; 290 break; 291 case CS7: 292 new_lcr |= UART_LCR_WLEN7; 293 break; 294 default: 295 case CS8: 296 new_lcr |= UART_LCR_WLEN8; 297 break; 298 } 299 300 baud = tty_get_baud_rate(tty); 301 if (!baud) 302 baud = 9600; 303 304 status = qt2_set_port_config(dev, port_priv->device_port, baud, 305 new_lcr); 306 if (status < 0) 307 dev_err(&port->dev, "%s - qt2_set_port_config failed: %i\n", 308 __func__, status); 309 310 if (cflag & CRTSCTS) 311 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK, 312 SERIAL_CRTSCTS, 313 port_priv->device_port); 314 else 315 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK, 316 0, port_priv->device_port); 317 if (status < 0) 318 dev_err(&port->dev, "%s - set HW flow control failed: %i\n", 319 __func__, status); 320 321 if (I_IXOFF(tty) || I_IXON(tty)) { 322 u16 x = ((u16) (START_CHAR(tty) << 8) | (u16) (STOP_CHAR(tty))); 323 324 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK, 325 x, port_priv->device_port); 326 } else 327 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK, 328 0, port_priv->device_port); 329 330 if (status < 0) 331 dev_err(&port->dev, "%s - set SW flow control failed: %i\n", 332 __func__, status); 333 334 } 335 336 static int qt2_open(struct tty_struct *tty, struct usb_serial_port *port) 337 { 338 struct usb_serial *serial; 339 struct qt2_port_private *port_priv; 340 u8 *data; 341 u16 device_port; 342 int status; 343 unsigned long flags; 344 345 device_port = port->port_number; 346 347 serial = port->serial; 348 349 port_priv = usb_get_serial_port_data(port); 350 351 /* set the port to RS232 mode */ 352 status = qt2_control_msg(serial->dev, QT2_GET_SET_QMCR, 353 QT2_QMCR_RS232, device_port); 354 if (status < 0) { 355 dev_err(&port->dev, 356 "%s failed to set RS232 mode for port %i error %i\n", 357 __func__, device_port, status); 358 return status; 359 } 360 361 data = kzalloc(2, GFP_KERNEL); 362 if (!data) 363 return -ENOMEM; 364 365 /* open the port */ 366 status = usb_control_msg(serial->dev, 367 usb_rcvctrlpipe(serial->dev, 0), 368 QT_OPEN_CLOSE_CHANNEL, 369 0xc0, 0, 370 device_port, data, 2, QT2_USB_TIMEOUT); 371 372 if (status < 2) { 373 dev_err(&port->dev, "%s - open port failed %i\n", __func__, 374 status); 375 if (status >= 0) 376 status = -EIO; 377 kfree(data); 378 return status; 379 } 380 381 spin_lock_irqsave(&port_priv->lock, flags); 382 port_priv->shadowLSR = data[0]; 383 port_priv->shadowMSR = data[1]; 384 spin_unlock_irqrestore(&port_priv->lock, flags); 385 386 kfree(data); 387 388 /* set to default speed and 8bit word size */ 389 status = qt2_set_port_config(serial->dev, device_port, 390 DEFAULT_BAUD_RATE, UART_LCR_WLEN8); 391 if (status < 0) { 392 dev_err(&port->dev, "%s - initial setup failed (%i)\n", 393 __func__, device_port); 394 return status; 395 } 396 397 port_priv->device_port = (u8) device_port; 398 399 if (tty) 400 qt2_set_termios(tty, port, &tty->termios); 401 402 return 0; 403 404 } 405 406 static void qt2_close(struct usb_serial_port *port) 407 { 408 struct usb_serial *serial; 409 struct qt2_port_private *port_priv; 410 int i; 411 412 serial = port->serial; 413 port_priv = usb_get_serial_port_data(port); 414 415 usb_kill_urb(port_priv->write_urb); 416 417 /* flush the port transmit buffer */ 418 i = usb_control_msg(serial->dev, 419 usb_rcvctrlpipe(serial->dev, 0), 420 QT2_FLUSH_DEVICE, 0x40, 1, 421 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT); 422 423 if (i < 0) 424 dev_err(&port->dev, "%s - transmit buffer flush failed: %i\n", 425 __func__, i); 426 427 /* flush the port receive buffer */ 428 i = usb_control_msg(serial->dev, 429 usb_rcvctrlpipe(serial->dev, 0), 430 QT2_FLUSH_DEVICE, 0x40, 0, 431 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT); 432 433 if (i < 0) 434 dev_err(&port->dev, "%s - receive buffer flush failed: %i\n", 435 __func__, i); 436 437 /* close the port */ 438 i = usb_control_msg(serial->dev, 439 usb_sndctrlpipe(serial->dev, 0), 440 QT_OPEN_CLOSE_CHANNEL, 441 0x40, 0, 442 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT); 443 444 if (i < 0) 445 dev_err(&port->dev, "%s - close port failed %i\n", 446 __func__, i); 447 } 448 449 static void qt2_disconnect(struct usb_serial *serial) 450 { 451 struct qt2_serial_private *serial_priv = usb_get_serial_data(serial); 452 453 usb_kill_urb(serial_priv->read_urb); 454 } 455 456 static int get_serial_info(struct tty_struct *tty, 457 struct serial_struct *ss) 458 { 459 struct usb_serial_port *port = tty->driver_data; 460 461 ss->line = port->minor; 462 ss->port = 0; 463 ss->irq = 0; 464 ss->xmit_fifo_size = port->bulk_out_size; 465 ss->baud_base = 9600; 466 ss->close_delay = 5*HZ; 467 ss->closing_wait = 30*HZ; 468 return 0; 469 } 470 471 static void qt2_process_status(struct usb_serial_port *port, unsigned char *ch) 472 { 473 switch (*ch) { 474 case QT2_LINE_STATUS: 475 qt2_update_lsr(port, ch + 1); 476 break; 477 case QT2_MODEM_STATUS: 478 qt2_update_msr(port, ch + 1); 479 break; 480 } 481 } 482 483 /* not needed, kept to document functionality */ 484 static void qt2_process_xmit_empty(struct usb_serial_port *port, 485 unsigned char *ch) 486 { 487 int bytes_written; 488 489 bytes_written = (int)(*ch) + (int)(*(ch + 1) << 4); 490 } 491 492 /* not needed, kept to document functionality */ 493 static void qt2_process_flush(struct usb_serial_port *port, unsigned char *ch) 494 { 495 return; 496 } 497 498 static void qt2_process_read_urb(struct urb *urb) 499 { 500 struct usb_serial *serial; 501 struct qt2_serial_private *serial_priv; 502 struct usb_serial_port *port; 503 bool escapeflag; 504 unsigned char *ch; 505 int i; 506 unsigned char newport; 507 int len = urb->actual_length; 508 509 if (!len) 510 return; 511 512 ch = urb->transfer_buffer; 513 serial = urb->context; 514 serial_priv = usb_get_serial_data(serial); 515 port = serial->port[serial_priv->current_port]; 516 517 for (i = 0; i < urb->actual_length; i++) { 518 ch = (unsigned char *)urb->transfer_buffer + i; 519 if ((i <= (len - 3)) && 520 (*ch == QT2_CONTROL_BYTE) && 521 (*(ch + 1) == QT2_CONTROL_BYTE)) { 522 escapeflag = false; 523 switch (*(ch + 2)) { 524 case QT2_LINE_STATUS: 525 case QT2_MODEM_STATUS: 526 if (i > (len - 4)) { 527 dev_warn(&port->dev, 528 "%s - status message too short\n", 529 __func__); 530 break; 531 } 532 qt2_process_status(port, ch + 2); 533 i += 3; 534 escapeflag = true; 535 break; 536 case QT2_XMIT_HOLD: 537 if (i > (len - 5)) { 538 dev_warn(&port->dev, 539 "%s - xmit_empty message too short\n", 540 __func__); 541 break; 542 } 543 qt2_process_xmit_empty(port, ch + 3); 544 i += 4; 545 escapeflag = true; 546 break; 547 case QT2_CHANGE_PORT: 548 if (i > (len - 4)) { 549 dev_warn(&port->dev, 550 "%s - change_port message too short\n", 551 __func__); 552 break; 553 } 554 tty_flip_buffer_push(&port->port); 555 556 newport = *(ch + 3); 557 558 if (newport > serial->num_ports) { 559 dev_err(&port->dev, 560 "%s - port change to invalid port: %i\n", 561 __func__, newport); 562 break; 563 } 564 565 serial_priv->current_port = newport; 566 port = serial->port[serial_priv->current_port]; 567 i += 3; 568 escapeflag = true; 569 break; 570 case QT2_REC_FLUSH: 571 case QT2_XMIT_FLUSH: 572 qt2_process_flush(port, ch + 2); 573 i += 2; 574 escapeflag = true; 575 break; 576 case QT2_CONTROL_ESCAPE: 577 tty_insert_flip_string(&port->port, ch, 2); 578 i += 2; 579 escapeflag = true; 580 break; 581 default: 582 dev_warn(&port->dev, 583 "%s - unsupported command %i\n", 584 __func__, *(ch + 2)); 585 break; 586 } 587 if (escapeflag) 588 continue; 589 } 590 591 tty_insert_flip_char(&port->port, *ch, TTY_NORMAL); 592 } 593 594 tty_flip_buffer_push(&port->port); 595 } 596 597 static void qt2_write_bulk_callback(struct urb *urb) 598 { 599 struct usb_serial_port *port; 600 struct qt2_port_private *port_priv; 601 unsigned long flags; 602 603 port = urb->context; 604 port_priv = usb_get_serial_port_data(port); 605 606 spin_lock_irqsave(&port_priv->urb_lock, flags); 607 608 port_priv->urb_in_use = false; 609 usb_serial_port_softint(port); 610 611 spin_unlock_irqrestore(&port_priv->urb_lock, flags); 612 613 } 614 615 static void qt2_read_bulk_callback(struct urb *urb) 616 { 617 struct usb_serial *serial = urb->context; 618 int status; 619 620 if (urb->status) { 621 dev_warn(&serial->dev->dev, 622 "%s - non-zero urb status: %i\n", __func__, 623 urb->status); 624 return; 625 } 626 627 qt2_process_read_urb(urb); 628 629 status = usb_submit_urb(urb, GFP_ATOMIC); 630 if (status != 0) 631 dev_err(&serial->dev->dev, 632 "%s - resubmit read urb failed: %i\n", 633 __func__, status); 634 } 635 636 static int qt2_setup_urbs(struct usb_serial *serial) 637 { 638 struct usb_serial_port *port0; 639 struct qt2_serial_private *serial_priv; 640 int status; 641 642 port0 = serial->port[0]; 643 644 serial_priv = usb_get_serial_data(serial); 645 serial_priv->read_urb = usb_alloc_urb(0, GFP_KERNEL); 646 if (!serial_priv->read_urb) 647 return -ENOMEM; 648 649 usb_fill_bulk_urb(serial_priv->read_urb, serial->dev, 650 usb_rcvbulkpipe(serial->dev, 651 port0->bulk_in_endpointAddress), 652 serial_priv->read_buffer, 653 QT2_READ_BUFFER_SIZE, 654 qt2_read_bulk_callback, serial); 655 656 status = usb_submit_urb(serial_priv->read_urb, GFP_KERNEL); 657 if (status != 0) { 658 dev_err(&serial->dev->dev, 659 "%s - submit read urb failed %i\n", __func__, status); 660 usb_free_urb(serial_priv->read_urb); 661 return status; 662 } 663 664 return 0; 665 } 666 667 static int qt2_attach(struct usb_serial *serial) 668 { 669 struct qt2_serial_private *serial_priv; 670 int status; 671 672 /* power on unit */ 673 status = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 674 0xc2, 0x40, 0x8000, 0, NULL, 0, 675 QT2_USB_TIMEOUT); 676 if (status < 0) { 677 dev_err(&serial->dev->dev, 678 "%s - failed to power on unit: %i\n", __func__, status); 679 return status; 680 } 681 682 serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL); 683 if (!serial_priv) 684 return -ENOMEM; 685 686 serial_priv->read_buffer = kmalloc(QT2_READ_BUFFER_SIZE, GFP_KERNEL); 687 if (!serial_priv->read_buffer) { 688 status = -ENOMEM; 689 goto err_buf; 690 } 691 692 usb_set_serial_data(serial, serial_priv); 693 694 status = qt2_setup_urbs(serial); 695 if (status != 0) 696 goto attach_failed; 697 698 return 0; 699 700 attach_failed: 701 kfree(serial_priv->read_buffer); 702 err_buf: 703 kfree(serial_priv); 704 return status; 705 } 706 707 static int qt2_port_probe(struct usb_serial_port *port) 708 { 709 struct usb_serial *serial = port->serial; 710 struct qt2_port_private *port_priv; 711 u8 bEndpointAddress; 712 713 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL); 714 if (!port_priv) 715 return -ENOMEM; 716 717 spin_lock_init(&port_priv->lock); 718 spin_lock_init(&port_priv->urb_lock); 719 port_priv->port = port; 720 721 port_priv->write_buffer = kmalloc(QT2_WRITE_BUFFER_SIZE, GFP_KERNEL); 722 if (!port_priv->write_buffer) 723 goto err_buf; 724 725 port_priv->write_urb = usb_alloc_urb(0, GFP_KERNEL); 726 if (!port_priv->write_urb) 727 goto err_urb; 728 729 bEndpointAddress = serial->port[0]->bulk_out_endpointAddress; 730 usb_fill_bulk_urb(port_priv->write_urb, serial->dev, 731 usb_sndbulkpipe(serial->dev, bEndpointAddress), 732 port_priv->write_buffer, 733 QT2_WRITE_BUFFER_SIZE, 734 qt2_write_bulk_callback, port); 735 736 usb_set_serial_port_data(port, port_priv); 737 738 return 0; 739 err_urb: 740 kfree(port_priv->write_buffer); 741 err_buf: 742 kfree(port_priv); 743 return -ENOMEM; 744 } 745 746 static int qt2_port_remove(struct usb_serial_port *port) 747 { 748 struct qt2_port_private *port_priv; 749 750 port_priv = usb_get_serial_port_data(port); 751 usb_free_urb(port_priv->write_urb); 752 kfree(port_priv->write_buffer); 753 kfree(port_priv); 754 755 return 0; 756 } 757 758 static int qt2_tiocmget(struct tty_struct *tty) 759 { 760 struct usb_serial_port *port = tty->driver_data; 761 struct usb_device *dev = port->serial->dev; 762 struct qt2_port_private *port_priv = usb_get_serial_port_data(port); 763 u8 *d; 764 int r; 765 766 d = kzalloc(2, GFP_KERNEL); 767 if (!d) 768 return -ENOMEM; 769 770 r = qt2_getregister(dev, port_priv->device_port, UART_MCR, d); 771 if (r < 0) 772 goto mget_out; 773 774 r = qt2_getregister(dev, port_priv->device_port, UART_MSR, d + 1); 775 if (r < 0) 776 goto mget_out; 777 778 r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) | 779 (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) | 780 (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) | 781 (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) | 782 (d[1] & UART_MSR_RI ? TIOCM_RI : 0) | 783 (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0); 784 785 mget_out: 786 kfree(d); 787 return r; 788 } 789 790 static int qt2_tiocmset(struct tty_struct *tty, 791 unsigned int set, unsigned int clear) 792 { 793 struct qt2_port_private *port_priv; 794 795 port_priv = usb_get_serial_port_data(tty->driver_data); 796 return update_mctrl(port_priv, set, clear); 797 } 798 799 static void qt2_break_ctl(struct tty_struct *tty, int break_state) 800 { 801 struct usb_serial_port *port = tty->driver_data; 802 struct qt2_port_private *port_priv; 803 int status; 804 u16 val; 805 806 port_priv = usb_get_serial_port_data(port); 807 808 val = (break_state == -1) ? 1 : 0; 809 810 status = qt2_control_msg(port->serial->dev, QT2_BREAK_CONTROL, 811 val, port_priv->device_port); 812 if (status < 0) 813 dev_warn(&port->dev, 814 "%s - failed to send control message: %i\n", __func__, 815 status); 816 } 817 818 819 820 static void qt2_dtr_rts(struct usb_serial_port *port, int on) 821 { 822 struct usb_device *dev = port->serial->dev; 823 struct qt2_port_private *port_priv = usb_get_serial_port_data(port); 824 825 /* Disable flow control */ 826 if (!on) { 827 if (qt2_setregister(dev, port_priv->device_port, 828 UART_MCR, 0) < 0) 829 dev_warn(&port->dev, "error from flowcontrol urb\n"); 830 } 831 /* drop RTS and DTR */ 832 if (on) 833 update_mctrl(port_priv, TIOCM_DTR | TIOCM_RTS, 0); 834 else 835 update_mctrl(port_priv, 0, TIOCM_DTR | TIOCM_RTS); 836 } 837 838 static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch) 839 { 840 struct qt2_port_private *port_priv; 841 u8 newMSR = (u8) *ch; 842 unsigned long flags; 843 844 /* May be called from qt2_process_read_urb() for an unbound port. */ 845 port_priv = usb_get_serial_port_data(port); 846 if (!port_priv) 847 return; 848 849 spin_lock_irqsave(&port_priv->lock, flags); 850 port_priv->shadowMSR = newMSR; 851 spin_unlock_irqrestore(&port_priv->lock, flags); 852 853 if (newMSR & UART_MSR_ANY_DELTA) { 854 /* update input line counters */ 855 if (newMSR & UART_MSR_DCTS) 856 port->icount.cts++; 857 if (newMSR & UART_MSR_DDSR) 858 port->icount.dsr++; 859 if (newMSR & UART_MSR_DDCD) 860 port->icount.dcd++; 861 if (newMSR & UART_MSR_TERI) 862 port->icount.rng++; 863 864 wake_up_interruptible(&port->port.delta_msr_wait); 865 } 866 } 867 868 static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch) 869 { 870 struct qt2_port_private *port_priv; 871 struct async_icount *icount; 872 unsigned long flags; 873 u8 newLSR = (u8) *ch; 874 875 /* May be called from qt2_process_read_urb() for an unbound port. */ 876 port_priv = usb_get_serial_port_data(port); 877 if (!port_priv) 878 return; 879 880 if (newLSR & UART_LSR_BI) 881 newLSR &= (u8) (UART_LSR_OE | UART_LSR_BI); 882 883 spin_lock_irqsave(&port_priv->lock, flags); 884 port_priv->shadowLSR = newLSR; 885 spin_unlock_irqrestore(&port_priv->lock, flags); 886 887 icount = &port->icount; 888 889 if (newLSR & UART_LSR_BRK_ERROR_BITS) { 890 891 if (newLSR & UART_LSR_BI) 892 icount->brk++; 893 894 if (newLSR & UART_LSR_OE) 895 icount->overrun++; 896 897 if (newLSR & UART_LSR_PE) 898 icount->parity++; 899 900 if (newLSR & UART_LSR_FE) 901 icount->frame++; 902 } 903 904 } 905 906 static int qt2_write_room(struct tty_struct *tty) 907 { 908 struct usb_serial_port *port = tty->driver_data; 909 struct qt2_port_private *port_priv; 910 unsigned long flags = 0; 911 int r; 912 913 port_priv = usb_get_serial_port_data(port); 914 915 spin_lock_irqsave(&port_priv->urb_lock, flags); 916 917 if (port_priv->urb_in_use) 918 r = 0; 919 else 920 r = QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE; 921 922 spin_unlock_irqrestore(&port_priv->urb_lock, flags); 923 924 return r; 925 } 926 927 static int qt2_write(struct tty_struct *tty, 928 struct usb_serial_port *port, 929 const unsigned char *buf, int count) 930 { 931 struct qt2_port_private *port_priv; 932 struct urb *write_urb; 933 unsigned char *data; 934 unsigned long flags; 935 int status; 936 int bytes_out = 0; 937 938 port_priv = usb_get_serial_port_data(port); 939 940 if (port_priv->write_urb == NULL) { 941 dev_err(&port->dev, "%s - no output urb\n", __func__); 942 return 0; 943 } 944 write_urb = port_priv->write_urb; 945 946 count = min(count, QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE); 947 948 data = write_urb->transfer_buffer; 949 spin_lock_irqsave(&port_priv->urb_lock, flags); 950 if (port_priv->urb_in_use) { 951 dev_err(&port->dev, "qt2_write - urb is in use\n"); 952 goto write_out; 953 } 954 955 *data++ = QT2_CONTROL_BYTE; 956 *data++ = QT2_CONTROL_BYTE; 957 *data++ = port_priv->device_port; 958 put_unaligned_le16(count, data); 959 data += 2; 960 memcpy(data, buf, count); 961 962 write_urb->transfer_buffer_length = count + QT2_WRITE_CONTROL_SIZE; 963 964 status = usb_submit_urb(write_urb, GFP_ATOMIC); 965 if (status == 0) { 966 port_priv->urb_in_use = true; 967 bytes_out += count; 968 } 969 970 write_out: 971 spin_unlock_irqrestore(&port_priv->urb_lock, flags); 972 return bytes_out; 973 } 974 975 976 static struct usb_serial_driver qt2_device = { 977 .driver = { 978 .owner = THIS_MODULE, 979 .name = "quatech-serial", 980 }, 981 .description = DRIVER_DESC, 982 .id_table = id_table, 983 .open = qt2_open, 984 .close = qt2_close, 985 .write = qt2_write, 986 .write_room = qt2_write_room, 987 .calc_num_ports = qt2_calc_num_ports, 988 .attach = qt2_attach, 989 .release = qt2_release, 990 .disconnect = qt2_disconnect, 991 .port_probe = qt2_port_probe, 992 .port_remove = qt2_port_remove, 993 .dtr_rts = qt2_dtr_rts, 994 .break_ctl = qt2_break_ctl, 995 .tiocmget = qt2_tiocmget, 996 .tiocmset = qt2_tiocmset, 997 .tiocmiwait = usb_serial_generic_tiocmiwait, 998 .get_icount = usb_serial_generic_get_icount, 999 .get_serial = get_serial_info, 1000 .set_termios = qt2_set_termios, 1001 }; 1002 1003 static struct usb_serial_driver *const serial_drivers[] = { 1004 &qt2_device, NULL 1005 }; 1006 1007 module_usb_serial_driver(serial_drivers, id_table); 1008 1009 MODULE_DESCRIPTION(DRIVER_DESC); 1010 MODULE_LICENSE("GPL v2"); 1011