1 /* 2 * usb-serial driver for Quatech USB 2 devices 3 * 4 * Copyright (C) 2012 Bill Pemberton (wfp5p@virginia.edu) 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License version 2 8 * as published by the Free Software Foundation. 9 * 10 * 11 * These devices all have only 1 bulk in and 1 bulk out that is shared 12 * for all serial ports. 13 * 14 */ 15 16 #include <asm/unaligned.h> 17 #include <linux/errno.h> 18 #include <linux/slab.h> 19 #include <linux/tty.h> 20 #include <linux/tty_driver.h> 21 #include <linux/tty_flip.h> 22 #include <linux/module.h> 23 #include <linux/serial.h> 24 #include <linux/usb.h> 25 #include <linux/usb/serial.h> 26 #include <linux/serial_reg.h> 27 #include <linux/uaccess.h> 28 29 /* default urb timeout for usb operations */ 30 #define QT2_USB_TIMEOUT USB_CTRL_SET_TIMEOUT 31 32 #define QT_OPEN_CLOSE_CHANNEL 0xca 33 #define QT_SET_GET_DEVICE 0xc2 34 #define QT_SET_GET_REGISTER 0xc0 35 #define QT_GET_SET_PREBUF_TRIG_LVL 0xcc 36 #define QT_SET_ATF 0xcd 37 #define QT_TRANSFER_IN 0xc0 38 #define QT_HW_FLOW_CONTROL_MASK 0xc5 39 #define QT_SW_FLOW_CONTROL_MASK 0xc6 40 #define QT2_BREAK_CONTROL 0xc8 41 #define QT2_GET_SET_UART 0xc1 42 #define QT2_FLUSH_DEVICE 0xc4 43 #define QT2_GET_SET_QMCR 0xe1 44 #define QT2_QMCR_RS232 0x40 45 #define QT2_QMCR_RS422 0x10 46 47 #define SERIAL_CRTSCTS ((UART_MCR_RTS << 8) | UART_MSR_CTS) 48 49 #define SERIAL_EVEN_PARITY (UART_LCR_PARITY | UART_LCR_EPAR) 50 51 /* status bytes for the device */ 52 #define QT2_CONTROL_BYTE 0x1b 53 #define QT2_LINE_STATUS 0x00 /* following 1 byte is line status */ 54 #define QT2_MODEM_STATUS 0x01 /* following 1 byte is modem status */ 55 #define QT2_XMIT_HOLD 0x02 /* following 2 bytes are ?? */ 56 #define QT2_CHANGE_PORT 0x03 /* following 1 byte is port to change to */ 57 #define QT2_REC_FLUSH 0x04 /* no following info */ 58 #define QT2_XMIT_FLUSH 0x05 /* no following info */ 59 #define QT2_CONTROL_ESCAPE 0xff /* pass through previous 2 control bytes */ 60 61 #define MAX_BAUD_RATE 921600 62 #define DEFAULT_BAUD_RATE 9600 63 64 #define QT2_READ_BUFFER_SIZE 512 /* size of read buffer */ 65 #define QT2_WRITE_BUFFER_SIZE 512 /* size of write buffer */ 66 #define QT2_WRITE_CONTROL_SIZE 5 /* control bytes used for a write */ 67 68 #define DRIVER_DESC "Quatech 2nd gen USB to Serial Driver" 69 70 #define USB_VENDOR_ID_QUATECH 0x061d 71 #define QUATECH_SSU2_100 0xC120 /* RS232 single port */ 72 #define QUATECH_DSU2_100 0xC140 /* RS232 dual port */ 73 #define QUATECH_DSU2_400 0xC150 /* RS232/422/485 dual port */ 74 #define QUATECH_QSU2_100 0xC160 /* RS232 four port */ 75 #define QUATECH_QSU2_400 0xC170 /* RS232/422/485 four port */ 76 #define QUATECH_ESU2_100 0xC1A0 /* RS232 eight port */ 77 #define QUATECH_ESU2_400 0xC180 /* RS232/422/485 eight port */ 78 79 struct qt2_device_detail { 80 int product_id; 81 int num_ports; 82 }; 83 84 #define QT_DETAILS(prod, ports) \ 85 .product_id = (prod), \ 86 .num_ports = (ports) 87 88 static const struct qt2_device_detail qt2_device_details[] = { 89 {QT_DETAILS(QUATECH_SSU2_100, 1)}, 90 {QT_DETAILS(QUATECH_DSU2_400, 2)}, 91 {QT_DETAILS(QUATECH_DSU2_100, 2)}, 92 {QT_DETAILS(QUATECH_QSU2_400, 4)}, 93 {QT_DETAILS(QUATECH_QSU2_100, 4)}, 94 {QT_DETAILS(QUATECH_ESU2_400, 8)}, 95 {QT_DETAILS(QUATECH_ESU2_100, 8)}, 96 {QT_DETAILS(0, 0)} /* Terminating entry */ 97 }; 98 99 static const struct usb_device_id id_table[] = { 100 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_SSU2_100)}, 101 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU2_100)}, 102 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU2_400)}, 103 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU2_100)}, 104 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU2_400)}, 105 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU2_100)}, 106 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU2_400)}, 107 {} /* Terminating entry */ 108 }; 109 MODULE_DEVICE_TABLE(usb, id_table); 110 111 struct qt2_serial_private { 112 unsigned char current_port; /* current port for incoming data */ 113 114 struct urb *read_urb; /* shared among all ports */ 115 char *read_buffer; 116 }; 117 118 struct qt2_port_private { 119 u8 device_port; 120 121 spinlock_t urb_lock; 122 bool urb_in_use; 123 struct urb *write_urb; 124 char *write_buffer; 125 126 spinlock_t lock; 127 u8 shadowLSR; 128 u8 shadowMSR; 129 130 struct usb_serial_port *port; 131 }; 132 133 static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch); 134 static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch); 135 static void qt2_write_bulk_callback(struct urb *urb); 136 static void qt2_read_bulk_callback(struct urb *urb); 137 138 static void qt2_release(struct usb_serial *serial) 139 { 140 struct qt2_serial_private *serial_priv; 141 142 serial_priv = usb_get_serial_data(serial); 143 144 usb_kill_urb(serial_priv->read_urb); 145 usb_free_urb(serial_priv->read_urb); 146 kfree(serial_priv->read_buffer); 147 kfree(serial_priv); 148 } 149 150 static inline int calc_baud_divisor(int baudrate) 151 { 152 int divisor, rem; 153 154 divisor = MAX_BAUD_RATE / baudrate; 155 rem = MAX_BAUD_RATE % baudrate; 156 /* Round to nearest divisor */ 157 if (((rem * 2) >= baudrate) && (baudrate != 110)) 158 divisor++; 159 160 return divisor; 161 } 162 163 static inline int qt2_set_port_config(struct usb_device *dev, 164 unsigned char port_number, 165 u16 baudrate, u16 lcr) 166 { 167 int divisor = calc_baud_divisor(baudrate); 168 u16 index = ((u16) (lcr << 8) | (u16) (port_number)); 169 170 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), 171 QT2_GET_SET_UART, 0x40, 172 divisor, index, NULL, 0, QT2_USB_TIMEOUT); 173 } 174 175 static inline int qt2_control_msg(struct usb_device *dev, 176 u8 request, u16 data, u16 index) 177 { 178 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), 179 request, 0x40, data, index, 180 NULL, 0, QT2_USB_TIMEOUT); 181 } 182 183 static inline int qt2_setdevice(struct usb_device *dev, u8 *data) 184 { 185 u16 x = ((u16) (data[1] << 8) | (u16) (data[0])); 186 187 return qt2_control_msg(dev, QT_SET_GET_DEVICE, x, 0); 188 } 189 190 191 static inline int qt2_getregister(struct usb_device *dev, 192 u8 uart, 193 u8 reg, 194 u8 *data) 195 { 196 int ret; 197 198 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), 199 QT_SET_GET_REGISTER, 0xc0, reg, 200 uart, data, sizeof(*data), QT2_USB_TIMEOUT); 201 if (ret < sizeof(*data)) { 202 if (ret >= 0) 203 ret = -EIO; 204 } 205 206 return ret; 207 } 208 209 static inline int qt2_setregister(struct usb_device *dev, 210 u8 uart, u8 reg, u16 data) 211 { 212 u16 value = (data << 8) | reg; 213 214 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), 215 QT_SET_GET_REGISTER, 0x40, value, uart, 216 NULL, 0, QT2_USB_TIMEOUT); 217 } 218 219 static inline int update_mctrl(struct qt2_port_private *port_priv, 220 unsigned int set, unsigned int clear) 221 { 222 struct usb_serial_port *port = port_priv->port; 223 struct usb_device *dev = port->serial->dev; 224 unsigned urb_value; 225 int status; 226 227 if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0) { 228 dev_dbg(&port->dev, 229 "update_mctrl - DTR|RTS not being set|cleared\n"); 230 return 0; /* no change */ 231 } 232 233 clear &= ~set; /* 'set' takes precedence over 'clear' */ 234 urb_value = 0; 235 if (set & TIOCM_DTR) 236 urb_value |= UART_MCR_DTR; 237 if (set & TIOCM_RTS) 238 urb_value |= UART_MCR_RTS; 239 240 status = qt2_setregister(dev, port_priv->device_port, UART_MCR, 241 urb_value); 242 if (status < 0) 243 dev_err(&port->dev, 244 "update_mctrl - Error from MODEM_CTRL urb: %i\n", 245 status); 246 return status; 247 } 248 249 static int qt2_calc_num_ports(struct usb_serial *serial) 250 { 251 struct qt2_device_detail d; 252 int i; 253 254 for (i = 0; d = qt2_device_details[i], d.product_id != 0; i++) { 255 if (d.product_id == le16_to_cpu(serial->dev->descriptor.idProduct)) 256 return d.num_ports; 257 } 258 259 /* we didn't recognize the device */ 260 dev_err(&serial->dev->dev, 261 "don't know the number of ports, assuming 1\n"); 262 263 return 1; 264 } 265 266 static void qt2_set_termios(struct tty_struct *tty, 267 struct usb_serial_port *port, 268 struct ktermios *old_termios) 269 { 270 struct usb_device *dev = port->serial->dev; 271 struct qt2_port_private *port_priv; 272 struct ktermios *termios = &tty->termios; 273 u16 baud; 274 unsigned int cflag = termios->c_cflag; 275 u16 new_lcr = 0; 276 int status; 277 278 port_priv = usb_get_serial_port_data(port); 279 280 if (cflag & PARENB) { 281 if (cflag & PARODD) 282 new_lcr |= UART_LCR_PARITY; 283 else 284 new_lcr |= SERIAL_EVEN_PARITY; 285 } 286 287 switch (cflag & CSIZE) { 288 case CS5: 289 new_lcr |= UART_LCR_WLEN5; 290 break; 291 case CS6: 292 new_lcr |= UART_LCR_WLEN6; 293 break; 294 case CS7: 295 new_lcr |= UART_LCR_WLEN7; 296 break; 297 default: 298 case CS8: 299 new_lcr |= UART_LCR_WLEN8; 300 break; 301 } 302 303 baud = tty_get_baud_rate(tty); 304 if (!baud) 305 baud = 9600; 306 307 status = qt2_set_port_config(dev, port_priv->device_port, baud, 308 new_lcr); 309 if (status < 0) 310 dev_err(&port->dev, "%s - qt2_set_port_config failed: %i\n", 311 __func__, status); 312 313 if (cflag & CRTSCTS) 314 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK, 315 SERIAL_CRTSCTS, 316 port_priv->device_port); 317 else 318 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK, 319 0, port_priv->device_port); 320 if (status < 0) 321 dev_err(&port->dev, "%s - set HW flow control failed: %i\n", 322 __func__, status); 323 324 if (I_IXOFF(tty) || I_IXON(tty)) { 325 u16 x = ((u16) (START_CHAR(tty) << 8) | (u16) (STOP_CHAR(tty))); 326 327 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK, 328 x, port_priv->device_port); 329 } else 330 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK, 331 0, port_priv->device_port); 332 333 if (status < 0) 334 dev_err(&port->dev, "%s - set SW flow control failed: %i\n", 335 __func__, status); 336 337 } 338 339 static int qt2_open(struct tty_struct *tty, struct usb_serial_port *port) 340 { 341 struct usb_serial *serial; 342 struct qt2_port_private *port_priv; 343 u8 *data; 344 u16 device_port; 345 int status; 346 unsigned long flags; 347 348 device_port = port->port_number; 349 350 serial = port->serial; 351 352 port_priv = usb_get_serial_port_data(port); 353 354 /* set the port to RS232 mode */ 355 status = qt2_control_msg(serial->dev, QT2_GET_SET_QMCR, 356 QT2_QMCR_RS232, device_port); 357 if (status < 0) { 358 dev_err(&port->dev, 359 "%s failed to set RS232 mode for port %i error %i\n", 360 __func__, device_port, status); 361 return status; 362 } 363 364 data = kzalloc(2, GFP_KERNEL); 365 if (!data) 366 return -ENOMEM; 367 368 /* open the port */ 369 status = usb_control_msg(serial->dev, 370 usb_rcvctrlpipe(serial->dev, 0), 371 QT_OPEN_CLOSE_CHANNEL, 372 0xc0, 0, 373 device_port, data, 2, QT2_USB_TIMEOUT); 374 375 if (status < 2) { 376 dev_err(&port->dev, "%s - open port failed %i\n", __func__, 377 status); 378 if (status >= 0) 379 status = -EIO; 380 kfree(data); 381 return status; 382 } 383 384 spin_lock_irqsave(&port_priv->lock, flags); 385 port_priv->shadowLSR = data[0]; 386 port_priv->shadowMSR = data[1]; 387 spin_unlock_irqrestore(&port_priv->lock, flags); 388 389 kfree(data); 390 391 /* set to default speed and 8bit word size */ 392 status = qt2_set_port_config(serial->dev, device_port, 393 DEFAULT_BAUD_RATE, UART_LCR_WLEN8); 394 if (status < 0) { 395 dev_err(&port->dev, "%s - initial setup failed (%i)\n", 396 __func__, device_port); 397 return status; 398 } 399 400 port_priv->device_port = (u8) device_port; 401 402 if (tty) 403 qt2_set_termios(tty, port, &tty->termios); 404 405 return 0; 406 407 } 408 409 static void qt2_close(struct usb_serial_port *port) 410 { 411 struct usb_serial *serial; 412 struct qt2_port_private *port_priv; 413 int i; 414 415 serial = port->serial; 416 port_priv = usb_get_serial_port_data(port); 417 418 usb_kill_urb(port_priv->write_urb); 419 420 /* flush the port transmit buffer */ 421 i = usb_control_msg(serial->dev, 422 usb_rcvctrlpipe(serial->dev, 0), 423 QT2_FLUSH_DEVICE, 0x40, 1, 424 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT); 425 426 if (i < 0) 427 dev_err(&port->dev, "%s - transmit buffer flush failed: %i\n", 428 __func__, i); 429 430 /* flush the port receive buffer */ 431 i = usb_control_msg(serial->dev, 432 usb_rcvctrlpipe(serial->dev, 0), 433 QT2_FLUSH_DEVICE, 0x40, 0, 434 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT); 435 436 if (i < 0) 437 dev_err(&port->dev, "%s - receive buffer flush failed: %i\n", 438 __func__, i); 439 440 /* close the port */ 441 i = usb_control_msg(serial->dev, 442 usb_sndctrlpipe(serial->dev, 0), 443 QT_OPEN_CLOSE_CHANNEL, 444 0x40, 0, 445 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT); 446 447 if (i < 0) 448 dev_err(&port->dev, "%s - close port failed %i\n", 449 __func__, i); 450 } 451 452 static void qt2_disconnect(struct usb_serial *serial) 453 { 454 struct qt2_serial_private *serial_priv = usb_get_serial_data(serial); 455 456 usb_kill_urb(serial_priv->read_urb); 457 } 458 459 static int get_serial_info(struct usb_serial_port *port, 460 struct serial_struct __user *retinfo) 461 { 462 struct serial_struct tmp; 463 464 memset(&tmp, 0, sizeof(tmp)); 465 tmp.line = port->minor; 466 tmp.port = 0; 467 tmp.irq = 0; 468 tmp.xmit_fifo_size = port->bulk_out_size; 469 tmp.baud_base = 9600; 470 tmp.close_delay = 5*HZ; 471 tmp.closing_wait = 30*HZ; 472 473 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) 474 return -EFAULT; 475 return 0; 476 } 477 478 static int qt2_ioctl(struct tty_struct *tty, 479 unsigned int cmd, unsigned long arg) 480 { 481 struct usb_serial_port *port = tty->driver_data; 482 483 switch (cmd) { 484 case TIOCGSERIAL: 485 return get_serial_info(port, 486 (struct serial_struct __user *)arg); 487 default: 488 break; 489 } 490 491 return -ENOIOCTLCMD; 492 } 493 494 static void qt2_process_status(struct usb_serial_port *port, unsigned char *ch) 495 { 496 switch (*ch) { 497 case QT2_LINE_STATUS: 498 qt2_update_lsr(port, ch + 1); 499 break; 500 case QT2_MODEM_STATUS: 501 qt2_update_msr(port, ch + 1); 502 break; 503 } 504 } 505 506 /* not needed, kept to document functionality */ 507 static void qt2_process_xmit_empty(struct usb_serial_port *port, 508 unsigned char *ch) 509 { 510 int bytes_written; 511 512 bytes_written = (int)(*ch) + (int)(*(ch + 1) << 4); 513 } 514 515 /* not needed, kept to document functionality */ 516 static void qt2_process_flush(struct usb_serial_port *port, unsigned char *ch) 517 { 518 return; 519 } 520 521 static void qt2_process_read_urb(struct urb *urb) 522 { 523 struct usb_serial *serial; 524 struct qt2_serial_private *serial_priv; 525 struct usb_serial_port *port; 526 struct qt2_port_private *port_priv; 527 bool escapeflag; 528 unsigned char *ch; 529 int i; 530 unsigned char newport; 531 int len = urb->actual_length; 532 533 if (!len) 534 return; 535 536 ch = urb->transfer_buffer; 537 serial = urb->context; 538 serial_priv = usb_get_serial_data(serial); 539 port = serial->port[serial_priv->current_port]; 540 port_priv = usb_get_serial_port_data(port); 541 542 for (i = 0; i < urb->actual_length; i++) { 543 ch = (unsigned char *)urb->transfer_buffer + i; 544 if ((i <= (len - 3)) && 545 (*ch == QT2_CONTROL_BYTE) && 546 (*(ch + 1) == QT2_CONTROL_BYTE)) { 547 escapeflag = false; 548 switch (*(ch + 2)) { 549 case QT2_LINE_STATUS: 550 case QT2_MODEM_STATUS: 551 if (i > (len - 4)) { 552 dev_warn(&port->dev, 553 "%s - status message too short\n", 554 __func__); 555 break; 556 } 557 qt2_process_status(port, ch + 2); 558 i += 3; 559 escapeflag = true; 560 break; 561 case QT2_XMIT_HOLD: 562 if (i > (len - 5)) { 563 dev_warn(&port->dev, 564 "%s - xmit_empty message too short\n", 565 __func__); 566 break; 567 } 568 qt2_process_xmit_empty(port, ch + 3); 569 i += 4; 570 escapeflag = true; 571 break; 572 case QT2_CHANGE_PORT: 573 if (i > (len - 4)) { 574 dev_warn(&port->dev, 575 "%s - change_port message too short\n", 576 __func__); 577 break; 578 } 579 tty_flip_buffer_push(&port->port); 580 581 newport = *(ch + 3); 582 583 if (newport > serial->num_ports) { 584 dev_err(&port->dev, 585 "%s - port change to invalid port: %i\n", 586 __func__, newport); 587 break; 588 } 589 590 serial_priv->current_port = newport; 591 port = serial->port[serial_priv->current_port]; 592 port_priv = usb_get_serial_port_data(port); 593 i += 3; 594 escapeflag = true; 595 break; 596 case QT2_REC_FLUSH: 597 case QT2_XMIT_FLUSH: 598 qt2_process_flush(port, ch + 2); 599 i += 2; 600 escapeflag = true; 601 break; 602 case QT2_CONTROL_ESCAPE: 603 tty_buffer_request_room(&port->port, 2); 604 tty_insert_flip_string(&port->port, ch, 2); 605 i += 2; 606 escapeflag = true; 607 break; 608 default: 609 dev_warn(&port->dev, 610 "%s - unsupported command %i\n", 611 __func__, *(ch + 2)); 612 break; 613 } 614 if (escapeflag) 615 continue; 616 } 617 618 tty_buffer_request_room(&port->port, 1); 619 tty_insert_flip_string(&port->port, ch, 1); 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