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 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License version 2 9 * as published by the Free Software Foundation. 10 * 11 * 12 * These devices all have only 1 bulk in and 1 bulk out that is shared 13 * for all serial ports. 14 * 15 */ 16 17 #include <asm/unaligned.h> 18 #include <linux/errno.h> 19 #include <linux/slab.h> 20 #include <linux/tty.h> 21 #include <linux/tty_driver.h> 22 #include <linux/tty_flip.h> 23 #include <linux/module.h> 24 #include <linux/serial.h> 25 #include <linux/usb.h> 26 #include <linux/usb/serial.h> 27 #include <linux/serial_reg.h> 28 #include <linux/uaccess.h> 29 30 /* default urb timeout for usb operations */ 31 #define QT2_USB_TIMEOUT USB_CTRL_SET_TIMEOUT 32 33 #define QT_OPEN_CLOSE_CHANNEL 0xca 34 #define QT_SET_GET_DEVICE 0xc2 35 #define QT_SET_GET_REGISTER 0xc0 36 #define QT_GET_SET_PREBUF_TRIG_LVL 0xcc 37 #define QT_SET_ATF 0xcd 38 #define QT_TRANSFER_IN 0xc0 39 #define QT_HW_FLOW_CONTROL_MASK 0xc5 40 #define QT_SW_FLOW_CONTROL_MASK 0xc6 41 #define QT2_BREAK_CONTROL 0xc8 42 #define QT2_GET_SET_UART 0xc1 43 #define QT2_FLUSH_DEVICE 0xc4 44 #define QT2_GET_SET_QMCR 0xe1 45 #define QT2_QMCR_RS232 0x40 46 #define QT2_QMCR_RS422 0x10 47 48 #define SERIAL_CRTSCTS ((UART_MCR_RTS << 8) | UART_MSR_CTS) 49 50 #define SERIAL_EVEN_PARITY (UART_LCR_PARITY | UART_LCR_EPAR) 51 52 /* status bytes for the device */ 53 #define QT2_CONTROL_BYTE 0x1b 54 #define QT2_LINE_STATUS 0x00 /* following 1 byte is line status */ 55 #define QT2_MODEM_STATUS 0x01 /* following 1 byte is modem status */ 56 #define QT2_XMIT_HOLD 0x02 /* following 2 bytes are ?? */ 57 #define QT2_CHANGE_PORT 0x03 /* following 1 byte is port to change to */ 58 #define QT2_REC_FLUSH 0x04 /* no following info */ 59 #define QT2_XMIT_FLUSH 0x05 /* no following info */ 60 #define QT2_CONTROL_ESCAPE 0xff /* pass through previous 2 control bytes */ 61 62 #define MAX_BAUD_RATE 921600 63 #define DEFAULT_BAUD_RATE 9600 64 65 #define QT2_READ_BUFFER_SIZE 512 /* size of read buffer */ 66 #define QT2_WRITE_BUFFER_SIZE 512 /* size of write buffer */ 67 #define QT2_WRITE_CONTROL_SIZE 5 /* control bytes used for a write */ 68 69 #define DRIVER_DESC "Quatech 2nd gen USB to Serial Driver" 70 71 #define USB_VENDOR_ID_QUATECH 0x061d 72 #define QUATECH_SSU2_100 0xC120 /* RS232 single port */ 73 #define QUATECH_DSU2_100 0xC140 /* RS232 dual port */ 74 #define QUATECH_DSU2_400 0xC150 /* RS232/422/485 dual port */ 75 #define QUATECH_QSU2_100 0xC160 /* RS232 four port */ 76 #define QUATECH_QSU2_400 0xC170 /* RS232/422/485 four port */ 77 #define QUATECH_ESU2_100 0xC1A0 /* RS232 eight port */ 78 #define QUATECH_ESU2_400 0xC180 /* RS232/422/485 eight port */ 79 80 struct qt2_device_detail { 81 int product_id; 82 int num_ports; 83 }; 84 85 #define QT_DETAILS(prod, ports) \ 86 .product_id = (prod), \ 87 .num_ports = (ports) 88 89 static const struct qt2_device_detail qt2_device_details[] = { 90 {QT_DETAILS(QUATECH_SSU2_100, 1)}, 91 {QT_DETAILS(QUATECH_DSU2_400, 2)}, 92 {QT_DETAILS(QUATECH_DSU2_100, 2)}, 93 {QT_DETAILS(QUATECH_QSU2_400, 4)}, 94 {QT_DETAILS(QUATECH_QSU2_100, 4)}, 95 {QT_DETAILS(QUATECH_ESU2_400, 8)}, 96 {QT_DETAILS(QUATECH_ESU2_100, 8)}, 97 {QT_DETAILS(0, 0)} /* Terminating entry */ 98 }; 99 100 static const struct usb_device_id id_table[] = { 101 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_SSU2_100)}, 102 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU2_100)}, 103 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU2_400)}, 104 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU2_100)}, 105 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU2_400)}, 106 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU2_100)}, 107 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU2_400)}, 108 {} /* Terminating entry */ 109 }; 110 MODULE_DEVICE_TABLE(usb, id_table); 111 112 struct qt2_serial_private { 113 unsigned char current_port; /* current port for incoming data */ 114 115 struct urb *read_urb; /* shared among all ports */ 116 char *read_buffer; 117 }; 118 119 struct qt2_port_private { 120 u8 device_port; 121 122 spinlock_t urb_lock; 123 bool urb_in_use; 124 struct urb *write_urb; 125 char *write_buffer; 126 127 spinlock_t lock; 128 u8 shadowLSR; 129 u8 shadowMSR; 130 131 struct usb_serial_port *port; 132 }; 133 134 static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch); 135 static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch); 136 static void qt2_write_bulk_callback(struct urb *urb); 137 static void qt2_read_bulk_callback(struct urb *urb); 138 139 static void qt2_release(struct usb_serial *serial) 140 { 141 struct qt2_serial_private *serial_priv; 142 143 serial_priv = usb_get_serial_data(serial); 144 145 usb_kill_urb(serial_priv->read_urb); 146 usb_free_urb(serial_priv->read_urb); 147 kfree(serial_priv->read_buffer); 148 kfree(serial_priv); 149 } 150 151 static inline int calc_baud_divisor(int baudrate) 152 { 153 int divisor, rem; 154 155 divisor = MAX_BAUD_RATE / baudrate; 156 rem = MAX_BAUD_RATE % baudrate; 157 /* Round to nearest divisor */ 158 if (((rem * 2) >= baudrate) && (baudrate != 110)) 159 divisor++; 160 161 return divisor; 162 } 163 164 static inline int qt2_set_port_config(struct usb_device *dev, 165 unsigned char port_number, 166 u16 baudrate, u16 lcr) 167 { 168 int divisor = calc_baud_divisor(baudrate); 169 u16 index = ((u16) (lcr << 8) | (u16) (port_number)); 170 171 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), 172 QT2_GET_SET_UART, 0x40, 173 divisor, index, NULL, 0, QT2_USB_TIMEOUT); 174 } 175 176 static inline int qt2_control_msg(struct usb_device *dev, 177 u8 request, u16 data, u16 index) 178 { 179 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), 180 request, 0x40, data, index, 181 NULL, 0, QT2_USB_TIMEOUT); 182 } 183 184 static inline int qt2_setdevice(struct usb_device *dev, u8 *data) 185 { 186 u16 x = ((u16) (data[1] << 8) | (u16) (data[0])); 187 188 return qt2_control_msg(dev, QT_SET_GET_DEVICE, x, 0); 189 } 190 191 192 static inline int qt2_getregister(struct usb_device *dev, 193 u8 uart, 194 u8 reg, 195 u8 *data) 196 { 197 int ret; 198 199 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), 200 QT_SET_GET_REGISTER, 0xc0, reg, 201 uart, data, sizeof(*data), QT2_USB_TIMEOUT); 202 if (ret < sizeof(*data)) { 203 if (ret >= 0) 204 ret = -EIO; 205 } 206 207 return ret; 208 } 209 210 static inline int qt2_setregister(struct usb_device *dev, 211 u8 uart, u8 reg, u16 data) 212 { 213 u16 value = (data << 8) | reg; 214 215 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), 216 QT_SET_GET_REGISTER, 0x40, value, uart, 217 NULL, 0, QT2_USB_TIMEOUT); 218 } 219 220 static inline int update_mctrl(struct qt2_port_private *port_priv, 221 unsigned int set, unsigned int clear) 222 { 223 struct usb_serial_port *port = port_priv->port; 224 struct usb_device *dev = port->serial->dev; 225 unsigned urb_value; 226 int status; 227 228 if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0) { 229 dev_dbg(&port->dev, 230 "update_mctrl - DTR|RTS not being set|cleared\n"); 231 return 0; /* no change */ 232 } 233 234 clear &= ~set; /* 'set' takes precedence over 'clear' */ 235 urb_value = 0; 236 if (set & TIOCM_DTR) 237 urb_value |= UART_MCR_DTR; 238 if (set & TIOCM_RTS) 239 urb_value |= UART_MCR_RTS; 240 241 status = qt2_setregister(dev, port_priv->device_port, UART_MCR, 242 urb_value); 243 if (status < 0) 244 dev_err(&port->dev, 245 "update_mctrl - Error from MODEM_CTRL urb: %i\n", 246 status); 247 return status; 248 } 249 250 static int qt2_calc_num_ports(struct usb_serial *serial, 251 struct usb_serial_endpoints *epds) 252 { 253 struct qt2_device_detail d; 254 int i; 255 256 for (i = 0; d = qt2_device_details[i], d.product_id != 0; i++) { 257 if (d.product_id == le16_to_cpu(serial->dev->descriptor.idProduct)) 258 return d.num_ports; 259 } 260 261 /* we didn't recognize the device */ 262 dev_err(&serial->dev->dev, 263 "don't know the number of ports, assuming 1\n"); 264 265 return 1; 266 } 267 268 static void qt2_set_termios(struct tty_struct *tty, 269 struct usb_serial_port *port, 270 struct ktermios *old_termios) 271 { 272 struct usb_device *dev = port->serial->dev; 273 struct qt2_port_private *port_priv; 274 struct ktermios *termios = &tty->termios; 275 u16 baud; 276 unsigned int cflag = termios->c_cflag; 277 u16 new_lcr = 0; 278 int status; 279 280 port_priv = usb_get_serial_port_data(port); 281 282 if (cflag & PARENB) { 283 if (cflag & PARODD) 284 new_lcr |= UART_LCR_PARITY; 285 else 286 new_lcr |= SERIAL_EVEN_PARITY; 287 } 288 289 switch (cflag & CSIZE) { 290 case CS5: 291 new_lcr |= UART_LCR_WLEN5; 292 break; 293 case CS6: 294 new_lcr |= UART_LCR_WLEN6; 295 break; 296 case CS7: 297 new_lcr |= UART_LCR_WLEN7; 298 break; 299 default: 300 case CS8: 301 new_lcr |= UART_LCR_WLEN8; 302 break; 303 } 304 305 baud = tty_get_baud_rate(tty); 306 if (!baud) 307 baud = 9600; 308 309 status = qt2_set_port_config(dev, port_priv->device_port, baud, 310 new_lcr); 311 if (status < 0) 312 dev_err(&port->dev, "%s - qt2_set_port_config failed: %i\n", 313 __func__, status); 314 315 if (cflag & CRTSCTS) 316 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK, 317 SERIAL_CRTSCTS, 318 port_priv->device_port); 319 else 320 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK, 321 0, port_priv->device_port); 322 if (status < 0) 323 dev_err(&port->dev, "%s - set HW flow control failed: %i\n", 324 __func__, status); 325 326 if (I_IXOFF(tty) || I_IXON(tty)) { 327 u16 x = ((u16) (START_CHAR(tty) << 8) | (u16) (STOP_CHAR(tty))); 328 329 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK, 330 x, port_priv->device_port); 331 } else 332 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK, 333 0, port_priv->device_port); 334 335 if (status < 0) 336 dev_err(&port->dev, "%s - set SW flow control failed: %i\n", 337 __func__, status); 338 339 } 340 341 static int qt2_open(struct tty_struct *tty, struct usb_serial_port *port) 342 { 343 struct usb_serial *serial; 344 struct qt2_port_private *port_priv; 345 u8 *data; 346 u16 device_port; 347 int status; 348 unsigned long flags; 349 350 device_port = port->port_number; 351 352 serial = port->serial; 353 354 port_priv = usb_get_serial_port_data(port); 355 356 /* set the port to RS232 mode */ 357 status = qt2_control_msg(serial->dev, QT2_GET_SET_QMCR, 358 QT2_QMCR_RS232, device_port); 359 if (status < 0) { 360 dev_err(&port->dev, 361 "%s failed to set RS232 mode for port %i error %i\n", 362 __func__, device_port, status); 363 return status; 364 } 365 366 data = kzalloc(2, GFP_KERNEL); 367 if (!data) 368 return -ENOMEM; 369 370 /* open the port */ 371 status = usb_control_msg(serial->dev, 372 usb_rcvctrlpipe(serial->dev, 0), 373 QT_OPEN_CLOSE_CHANNEL, 374 0xc0, 0, 375 device_port, data, 2, QT2_USB_TIMEOUT); 376 377 if (status < 2) { 378 dev_err(&port->dev, "%s - open port failed %i\n", __func__, 379 status); 380 if (status >= 0) 381 status = -EIO; 382 kfree(data); 383 return status; 384 } 385 386 spin_lock_irqsave(&port_priv->lock, flags); 387 port_priv->shadowLSR = data[0]; 388 port_priv->shadowMSR = data[1]; 389 spin_unlock_irqrestore(&port_priv->lock, flags); 390 391 kfree(data); 392 393 /* set to default speed and 8bit word size */ 394 status = qt2_set_port_config(serial->dev, device_port, 395 DEFAULT_BAUD_RATE, UART_LCR_WLEN8); 396 if (status < 0) { 397 dev_err(&port->dev, "%s - initial setup failed (%i)\n", 398 __func__, device_port); 399 return status; 400 } 401 402 port_priv->device_port = (u8) device_port; 403 404 if (tty) 405 qt2_set_termios(tty, port, &tty->termios); 406 407 return 0; 408 409 } 410 411 static void qt2_close(struct usb_serial_port *port) 412 { 413 struct usb_serial *serial; 414 struct qt2_port_private *port_priv; 415 int i; 416 417 serial = port->serial; 418 port_priv = usb_get_serial_port_data(port); 419 420 usb_kill_urb(port_priv->write_urb); 421 422 /* flush the port transmit buffer */ 423 i = usb_control_msg(serial->dev, 424 usb_rcvctrlpipe(serial->dev, 0), 425 QT2_FLUSH_DEVICE, 0x40, 1, 426 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT); 427 428 if (i < 0) 429 dev_err(&port->dev, "%s - transmit buffer flush failed: %i\n", 430 __func__, i); 431 432 /* flush the port receive buffer */ 433 i = usb_control_msg(serial->dev, 434 usb_rcvctrlpipe(serial->dev, 0), 435 QT2_FLUSH_DEVICE, 0x40, 0, 436 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT); 437 438 if (i < 0) 439 dev_err(&port->dev, "%s - receive buffer flush failed: %i\n", 440 __func__, i); 441 442 /* close the port */ 443 i = usb_control_msg(serial->dev, 444 usb_sndctrlpipe(serial->dev, 0), 445 QT_OPEN_CLOSE_CHANNEL, 446 0x40, 0, 447 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT); 448 449 if (i < 0) 450 dev_err(&port->dev, "%s - close port failed %i\n", 451 __func__, i); 452 } 453 454 static void qt2_disconnect(struct usb_serial *serial) 455 { 456 struct qt2_serial_private *serial_priv = usb_get_serial_data(serial); 457 458 usb_kill_urb(serial_priv->read_urb); 459 } 460 461 static int get_serial_info(struct usb_serial_port *port, 462 struct serial_struct __user *retinfo) 463 { 464 struct serial_struct tmp; 465 466 memset(&tmp, 0, sizeof(tmp)); 467 tmp.line = port->minor; 468 tmp.port = 0; 469 tmp.irq = 0; 470 tmp.xmit_fifo_size = port->bulk_out_size; 471 tmp.baud_base = 9600; 472 tmp.close_delay = 5*HZ; 473 tmp.closing_wait = 30*HZ; 474 475 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) 476 return -EFAULT; 477 return 0; 478 } 479 480 static int qt2_ioctl(struct tty_struct *tty, 481 unsigned int cmd, unsigned long arg) 482 { 483 struct usb_serial_port *port = tty->driver_data; 484 485 switch (cmd) { 486 case TIOCGSERIAL: 487 return get_serial_info(port, 488 (struct serial_struct __user *)arg); 489 default: 490 break; 491 } 492 493 return -ENOIOCTLCMD; 494 } 495 496 static void qt2_process_status(struct usb_serial_port *port, unsigned char *ch) 497 { 498 switch (*ch) { 499 case QT2_LINE_STATUS: 500 qt2_update_lsr(port, ch + 1); 501 break; 502 case QT2_MODEM_STATUS: 503 qt2_update_msr(port, ch + 1); 504 break; 505 } 506 } 507 508 /* not needed, kept to document functionality */ 509 static void qt2_process_xmit_empty(struct usb_serial_port *port, 510 unsigned char *ch) 511 { 512 int bytes_written; 513 514 bytes_written = (int)(*ch) + (int)(*(ch + 1) << 4); 515 } 516 517 /* not needed, kept to document functionality */ 518 static void qt2_process_flush(struct usb_serial_port *port, unsigned char *ch) 519 { 520 return; 521 } 522 523 static void qt2_process_read_urb(struct urb *urb) 524 { 525 struct usb_serial *serial; 526 struct qt2_serial_private *serial_priv; 527 struct usb_serial_port *port; 528 struct qt2_port_private *port_priv; 529 bool escapeflag; 530 unsigned char *ch; 531 int i; 532 unsigned char newport; 533 int len = urb->actual_length; 534 535 if (!len) 536 return; 537 538 ch = urb->transfer_buffer; 539 serial = urb->context; 540 serial_priv = usb_get_serial_data(serial); 541 port = serial->port[serial_priv->current_port]; 542 port_priv = usb_get_serial_port_data(port); 543 544 for (i = 0; i < urb->actual_length; i++) { 545 ch = (unsigned char *)urb->transfer_buffer + i; 546 if ((i <= (len - 3)) && 547 (*ch == QT2_CONTROL_BYTE) && 548 (*(ch + 1) == QT2_CONTROL_BYTE)) { 549 escapeflag = false; 550 switch (*(ch + 2)) { 551 case QT2_LINE_STATUS: 552 case QT2_MODEM_STATUS: 553 if (i > (len - 4)) { 554 dev_warn(&port->dev, 555 "%s - status message too short\n", 556 __func__); 557 break; 558 } 559 qt2_process_status(port, ch + 2); 560 i += 3; 561 escapeflag = true; 562 break; 563 case QT2_XMIT_HOLD: 564 if (i > (len - 5)) { 565 dev_warn(&port->dev, 566 "%s - xmit_empty message too short\n", 567 __func__); 568 break; 569 } 570 qt2_process_xmit_empty(port, ch + 3); 571 i += 4; 572 escapeflag = true; 573 break; 574 case QT2_CHANGE_PORT: 575 if (i > (len - 4)) { 576 dev_warn(&port->dev, 577 "%s - change_port message too short\n", 578 __func__); 579 break; 580 } 581 tty_flip_buffer_push(&port->port); 582 583 newport = *(ch + 3); 584 585 if (newport > serial->num_ports) { 586 dev_err(&port->dev, 587 "%s - port change to invalid port: %i\n", 588 __func__, newport); 589 break; 590 } 591 592 serial_priv->current_port = newport; 593 port = serial->port[serial_priv->current_port]; 594 port_priv = usb_get_serial_port_data(port); 595 i += 3; 596 escapeflag = true; 597 break; 598 case QT2_REC_FLUSH: 599 case QT2_XMIT_FLUSH: 600 qt2_process_flush(port, ch + 2); 601 i += 2; 602 escapeflag = true; 603 break; 604 case QT2_CONTROL_ESCAPE: 605 tty_insert_flip_string(&port->port, ch, 2); 606 i += 2; 607 escapeflag = true; 608 break; 609 default: 610 dev_warn(&port->dev, 611 "%s - unsupported command %i\n", 612 __func__, *(ch + 2)); 613 break; 614 } 615 if (escapeflag) 616 continue; 617 } 618 619 tty_insert_flip_char(&port->port, *ch, TTY_NORMAL); 620 } 621 622 tty_flip_buffer_push(&port->port); 623 } 624 625 static void qt2_write_bulk_callback(struct urb *urb) 626 { 627 struct usb_serial_port *port; 628 struct qt2_port_private *port_priv; 629 630 port = urb->context; 631 port_priv = usb_get_serial_port_data(port); 632 633 spin_lock(&port_priv->urb_lock); 634 635 port_priv->urb_in_use = false; 636 usb_serial_port_softint(port); 637 638 spin_unlock(&port_priv->urb_lock); 639 640 } 641 642 static void qt2_read_bulk_callback(struct urb *urb) 643 { 644 struct usb_serial *serial = urb->context; 645 int status; 646 647 if (urb->status) { 648 dev_warn(&serial->dev->dev, 649 "%s - non-zero urb status: %i\n", __func__, 650 urb->status); 651 return; 652 } 653 654 qt2_process_read_urb(urb); 655 656 status = usb_submit_urb(urb, GFP_ATOMIC); 657 if (status != 0) 658 dev_err(&serial->dev->dev, 659 "%s - resubmit read urb failed: %i\n", 660 __func__, status); 661 } 662 663 static int qt2_setup_urbs(struct usb_serial *serial) 664 { 665 struct usb_serial_port *port0; 666 struct qt2_serial_private *serial_priv; 667 int status; 668 669 port0 = serial->port[0]; 670 671 serial_priv = usb_get_serial_data(serial); 672 serial_priv->read_urb = usb_alloc_urb(0, GFP_KERNEL); 673 if (!serial_priv->read_urb) 674 return -ENOMEM; 675 676 usb_fill_bulk_urb(serial_priv->read_urb, serial->dev, 677 usb_rcvbulkpipe(serial->dev, 678 port0->bulk_in_endpointAddress), 679 serial_priv->read_buffer, 680 QT2_READ_BUFFER_SIZE, 681 qt2_read_bulk_callback, serial); 682 683 status = usb_submit_urb(serial_priv->read_urb, GFP_KERNEL); 684 if (status != 0) { 685 dev_err(&serial->dev->dev, 686 "%s - submit read urb failed %i\n", __func__, status); 687 usb_free_urb(serial_priv->read_urb); 688 return status; 689 } 690 691 return 0; 692 } 693 694 static int qt2_attach(struct usb_serial *serial) 695 { 696 struct qt2_serial_private *serial_priv; 697 int status; 698 699 /* power on unit */ 700 status = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 701 0xc2, 0x40, 0x8000, 0, NULL, 0, 702 QT2_USB_TIMEOUT); 703 if (status < 0) { 704 dev_err(&serial->dev->dev, 705 "%s - failed to power on unit: %i\n", __func__, status); 706 return status; 707 } 708 709 serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL); 710 if (!serial_priv) 711 return -ENOMEM; 712 713 serial_priv->read_buffer = kmalloc(QT2_READ_BUFFER_SIZE, GFP_KERNEL); 714 if (!serial_priv->read_buffer) { 715 status = -ENOMEM; 716 goto err_buf; 717 } 718 719 usb_set_serial_data(serial, serial_priv); 720 721 status = qt2_setup_urbs(serial); 722 if (status != 0) 723 goto attach_failed; 724 725 return 0; 726 727 attach_failed: 728 kfree(serial_priv->read_buffer); 729 err_buf: 730 kfree(serial_priv); 731 return status; 732 } 733 734 static int qt2_port_probe(struct usb_serial_port *port) 735 { 736 struct usb_serial *serial = port->serial; 737 struct qt2_port_private *port_priv; 738 u8 bEndpointAddress; 739 740 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL); 741 if (!port_priv) 742 return -ENOMEM; 743 744 spin_lock_init(&port_priv->lock); 745 spin_lock_init(&port_priv->urb_lock); 746 port_priv->port = port; 747 748 port_priv->write_buffer = kmalloc(QT2_WRITE_BUFFER_SIZE, GFP_KERNEL); 749 if (!port_priv->write_buffer) 750 goto err_buf; 751 752 port_priv->write_urb = usb_alloc_urb(0, GFP_KERNEL); 753 if (!port_priv->write_urb) 754 goto err_urb; 755 756 bEndpointAddress = serial->port[0]->bulk_out_endpointAddress; 757 usb_fill_bulk_urb(port_priv->write_urb, serial->dev, 758 usb_sndbulkpipe(serial->dev, bEndpointAddress), 759 port_priv->write_buffer, 760 QT2_WRITE_BUFFER_SIZE, 761 qt2_write_bulk_callback, port); 762 763 usb_set_serial_port_data(port, port_priv); 764 765 return 0; 766 err_urb: 767 kfree(port_priv->write_buffer); 768 err_buf: 769 kfree(port_priv); 770 return -ENOMEM; 771 } 772 773 static int qt2_port_remove(struct usb_serial_port *port) 774 { 775 struct qt2_port_private *port_priv; 776 777 port_priv = usb_get_serial_port_data(port); 778 usb_free_urb(port_priv->write_urb); 779 kfree(port_priv->write_buffer); 780 kfree(port_priv); 781 782 return 0; 783 } 784 785 static int qt2_tiocmget(struct tty_struct *tty) 786 { 787 struct usb_serial_port *port = tty->driver_data; 788 struct usb_device *dev = port->serial->dev; 789 struct qt2_port_private *port_priv = usb_get_serial_port_data(port); 790 u8 *d; 791 int r; 792 793 d = kzalloc(2, GFP_KERNEL); 794 if (!d) 795 return -ENOMEM; 796 797 r = qt2_getregister(dev, port_priv->device_port, UART_MCR, d); 798 if (r < 0) 799 goto mget_out; 800 801 r = qt2_getregister(dev, port_priv->device_port, UART_MSR, d + 1); 802 if (r < 0) 803 goto mget_out; 804 805 r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) | 806 (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) | 807 (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) | 808 (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) | 809 (d[1] & UART_MSR_RI ? TIOCM_RI : 0) | 810 (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0); 811 812 mget_out: 813 kfree(d); 814 return r; 815 } 816 817 static int qt2_tiocmset(struct tty_struct *tty, 818 unsigned int set, unsigned int clear) 819 { 820 struct qt2_port_private *port_priv; 821 822 port_priv = usb_get_serial_port_data(tty->driver_data); 823 return update_mctrl(port_priv, set, clear); 824 } 825 826 static void qt2_break_ctl(struct tty_struct *tty, int break_state) 827 { 828 struct usb_serial_port *port = tty->driver_data; 829 struct qt2_port_private *port_priv; 830 int status; 831 u16 val; 832 833 port_priv = usb_get_serial_port_data(port); 834 835 val = (break_state == -1) ? 1 : 0; 836 837 status = qt2_control_msg(port->serial->dev, QT2_BREAK_CONTROL, 838 val, port_priv->device_port); 839 if (status < 0) 840 dev_warn(&port->dev, 841 "%s - failed to send control message: %i\n", __func__, 842 status); 843 } 844 845 846 847 static void qt2_dtr_rts(struct usb_serial_port *port, int on) 848 { 849 struct usb_device *dev = port->serial->dev; 850 struct qt2_port_private *port_priv = usb_get_serial_port_data(port); 851 852 /* Disable flow control */ 853 if (!on) { 854 if (qt2_setregister(dev, port_priv->device_port, 855 UART_MCR, 0) < 0) 856 dev_warn(&port->dev, "error from flowcontrol urb\n"); 857 } 858 /* drop RTS and DTR */ 859 if (on) 860 update_mctrl(port_priv, TIOCM_DTR | TIOCM_RTS, 0); 861 else 862 update_mctrl(port_priv, 0, TIOCM_DTR | TIOCM_RTS); 863 } 864 865 static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch) 866 { 867 struct qt2_port_private *port_priv; 868 u8 newMSR = (u8) *ch; 869 unsigned long flags; 870 871 port_priv = usb_get_serial_port_data(port); 872 873 spin_lock_irqsave(&port_priv->lock, flags); 874 port_priv->shadowMSR = newMSR; 875 spin_unlock_irqrestore(&port_priv->lock, flags); 876 877 if (newMSR & UART_MSR_ANY_DELTA) { 878 /* update input line counters */ 879 if (newMSR & UART_MSR_DCTS) 880 port->icount.cts++; 881 if (newMSR & UART_MSR_DDSR) 882 port->icount.dsr++; 883 if (newMSR & UART_MSR_DDCD) 884 port->icount.dcd++; 885 if (newMSR & UART_MSR_TERI) 886 port->icount.rng++; 887 888 wake_up_interruptible(&port->port.delta_msr_wait); 889 } 890 } 891 892 static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch) 893 { 894 struct qt2_port_private *port_priv; 895 struct async_icount *icount; 896 unsigned long flags; 897 u8 newLSR = (u8) *ch; 898 899 port_priv = usb_get_serial_port_data(port); 900 901 if (newLSR & UART_LSR_BI) 902 newLSR &= (u8) (UART_LSR_OE | UART_LSR_BI); 903 904 spin_lock_irqsave(&port_priv->lock, flags); 905 port_priv->shadowLSR = newLSR; 906 spin_unlock_irqrestore(&port_priv->lock, flags); 907 908 icount = &port->icount; 909 910 if (newLSR & UART_LSR_BRK_ERROR_BITS) { 911 912 if (newLSR & UART_LSR_BI) 913 icount->brk++; 914 915 if (newLSR & UART_LSR_OE) 916 icount->overrun++; 917 918 if (newLSR & UART_LSR_PE) 919 icount->parity++; 920 921 if (newLSR & UART_LSR_FE) 922 icount->frame++; 923 } 924 925 } 926 927 static int qt2_write_room(struct tty_struct *tty) 928 { 929 struct usb_serial_port *port = tty->driver_data; 930 struct qt2_port_private *port_priv; 931 unsigned long flags = 0; 932 int r; 933 934 port_priv = usb_get_serial_port_data(port); 935 936 spin_lock_irqsave(&port_priv->urb_lock, flags); 937 938 if (port_priv->urb_in_use) 939 r = 0; 940 else 941 r = QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE; 942 943 spin_unlock_irqrestore(&port_priv->urb_lock, flags); 944 945 return r; 946 } 947 948 static int qt2_write(struct tty_struct *tty, 949 struct usb_serial_port *port, 950 const unsigned char *buf, int count) 951 { 952 struct qt2_port_private *port_priv; 953 struct urb *write_urb; 954 unsigned char *data; 955 unsigned long flags; 956 int status; 957 int bytes_out = 0; 958 959 port_priv = usb_get_serial_port_data(port); 960 961 if (port_priv->write_urb == NULL) { 962 dev_err(&port->dev, "%s - no output urb\n", __func__); 963 return 0; 964 } 965 write_urb = port_priv->write_urb; 966 967 count = min(count, QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE); 968 969 data = write_urb->transfer_buffer; 970 spin_lock_irqsave(&port_priv->urb_lock, flags); 971 if (port_priv->urb_in_use) { 972 dev_err(&port->dev, "qt2_write - urb is in use\n"); 973 goto write_out; 974 } 975 976 *data++ = QT2_CONTROL_BYTE; 977 *data++ = QT2_CONTROL_BYTE; 978 *data++ = port_priv->device_port; 979 put_unaligned_le16(count, data); 980 data += 2; 981 memcpy(data, buf, count); 982 983 write_urb->transfer_buffer_length = count + QT2_WRITE_CONTROL_SIZE; 984 985 status = usb_submit_urb(write_urb, GFP_ATOMIC); 986 if (status == 0) { 987 port_priv->urb_in_use = true; 988 bytes_out += count; 989 } 990 991 write_out: 992 spin_unlock_irqrestore(&port_priv->urb_lock, flags); 993 return bytes_out; 994 } 995 996 997 static struct usb_serial_driver qt2_device = { 998 .driver = { 999 .owner = THIS_MODULE, 1000 .name = "quatech-serial", 1001 }, 1002 .description = DRIVER_DESC, 1003 .id_table = id_table, 1004 .open = qt2_open, 1005 .close = qt2_close, 1006 .write = qt2_write, 1007 .write_room = qt2_write_room, 1008 .calc_num_ports = qt2_calc_num_ports, 1009 .attach = qt2_attach, 1010 .release = qt2_release, 1011 .disconnect = qt2_disconnect, 1012 .port_probe = qt2_port_probe, 1013 .port_remove = qt2_port_remove, 1014 .dtr_rts = qt2_dtr_rts, 1015 .break_ctl = qt2_break_ctl, 1016 .tiocmget = qt2_tiocmget, 1017 .tiocmset = qt2_tiocmset, 1018 .tiocmiwait = usb_serial_generic_tiocmiwait, 1019 .get_icount = usb_serial_generic_get_icount, 1020 .ioctl = qt2_ioctl, 1021 .set_termios = qt2_set_termios, 1022 }; 1023 1024 static struct usb_serial_driver *const serial_drivers[] = { 1025 &qt2_device, NULL 1026 }; 1027 1028 module_usb_serial_driver(serial_drivers, id_table); 1029 1030 MODULE_DESCRIPTION(DRIVER_DESC); 1031 MODULE_LICENSE("GPL"); 1032