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/init.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_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[512]; 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[QT2_WRITE_BUFFER_SIZE]; 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_free_urb(serial_priv->read_urb); 145 kfree(serial_priv); 146 } 147 148 static inline int calc_baud_divisor(int baudrate) 149 { 150 int divisor, rem; 151 152 divisor = MAX_BAUD_RATE / baudrate; 153 rem = MAX_BAUD_RATE % baudrate; 154 /* Round to nearest divisor */ 155 if (((rem * 2) >= baudrate) && (baudrate != 110)) 156 divisor++; 157 158 return divisor; 159 } 160 161 static inline int qt2_set_port_config(struct usb_device *dev, 162 unsigned char port_number, 163 u16 baudrate, u16 lcr) 164 { 165 int divisor = calc_baud_divisor(baudrate); 166 u16 index = ((u16) (lcr << 8) | (u16) (port_number)); 167 168 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), 169 QT2_GET_SET_UART, 0x40, 170 divisor, index, NULL, 0, QT2_USB_TIMEOUT); 171 } 172 173 static inline int qt2_control_msg(struct usb_device *dev, 174 u8 request, u16 data, u16 index) 175 { 176 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), 177 request, 0x40, data, index, 178 NULL, 0, QT2_USB_TIMEOUT); 179 } 180 181 static inline int qt2_setdevice(struct usb_device *dev, u8 *data) 182 { 183 u16 x = ((u16) (data[1] << 8) | (u16) (data[0])); 184 185 return qt2_control_msg(dev, QT_SET_GET_DEVICE, x, 0); 186 } 187 188 189 static inline int qt2_getdevice(struct usb_device *dev, u8 *data) 190 { 191 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), 192 QT_SET_GET_DEVICE, 0xc0, 0, 0, 193 data, 3, QT2_USB_TIMEOUT); 194 } 195 196 static inline int qt2_getregister(struct usb_device *dev, 197 u8 uart, 198 u8 reg, 199 u8 *data) 200 { 201 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), 202 QT_SET_GET_REGISTER, 0xc0, reg, 203 uart, data, sizeof(*data), QT2_USB_TIMEOUT); 204 205 } 206 207 static inline int qt2_setregister(struct usb_device *dev, 208 u8 uart, u8 reg, u16 data) 209 { 210 u16 value = (data << 8) | reg; 211 212 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), 213 QT_SET_GET_REGISTER, 0x40, value, uart, 214 NULL, 0, QT2_USB_TIMEOUT); 215 } 216 217 static inline int update_mctrl(struct qt2_port_private *port_priv, 218 unsigned int set, unsigned int clear) 219 { 220 struct usb_serial_port *port = port_priv->port; 221 struct usb_device *dev = port->serial->dev; 222 unsigned urb_value; 223 int status; 224 225 if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0) { 226 dev_dbg(&port->dev, 227 "update_mctrl - DTR|RTS not being set|cleared\n"); 228 return 0; /* no change */ 229 } 230 231 clear &= ~set; /* 'set' takes precedence over 'clear' */ 232 urb_value = 0; 233 if (set & TIOCM_DTR) 234 urb_value |= UART_MCR_DTR; 235 if (set & TIOCM_RTS) 236 urb_value |= UART_MCR_RTS; 237 238 status = qt2_setregister(dev, port_priv->device_port, UART_MCR, 239 urb_value); 240 if (status < 0) 241 dev_err(&port->dev, 242 "update_mctrl - Error from MODEM_CTRL urb: %i\n", 243 status); 244 return status; 245 } 246 247 static int qt2_calc_num_ports(struct usb_serial *serial) 248 { 249 struct qt2_device_detail d; 250 int i; 251 252 for (i = 0; d = qt2_device_details[i], d.product_id != 0; i++) { 253 if (d.product_id == le16_to_cpu(serial->dev->descriptor.idProduct)) 254 return d.num_ports; 255 } 256 257 /* we didn't recognize the device */ 258 dev_err(&serial->dev->dev, 259 "don't know the number of ports, assuming 1\n"); 260 261 return 1; 262 } 263 264 static void qt2_set_termios(struct tty_struct *tty, 265 struct usb_serial_port *port, 266 struct ktermios *old_termios) 267 { 268 struct usb_device *dev = port->serial->dev; 269 struct qt2_port_private *port_priv; 270 struct ktermios *termios = &tty->termios; 271 u16 baud; 272 unsigned int cflag = termios->c_cflag; 273 u16 new_lcr = 0; 274 int status; 275 276 port_priv = usb_get_serial_port_data(port); 277 278 if (cflag & PARENB) { 279 if (cflag & PARODD) 280 new_lcr |= UART_LCR_PARITY; 281 else 282 new_lcr |= SERIAL_EVEN_PARITY; 283 } 284 285 switch (cflag & CSIZE) { 286 case CS5: 287 new_lcr |= UART_LCR_WLEN5; 288 break; 289 case CS6: 290 new_lcr |= UART_LCR_WLEN6; 291 break; 292 case CS7: 293 new_lcr |= UART_LCR_WLEN7; 294 break; 295 default: 296 case CS8: 297 new_lcr |= UART_LCR_WLEN8; 298 break; 299 } 300 301 baud = tty_get_baud_rate(tty); 302 if (!baud) 303 baud = 9600; 304 305 status = qt2_set_port_config(dev, port_priv->device_port, baud, 306 new_lcr); 307 if (status < 0) 308 dev_err(&port->dev, "%s - qt2_set_port_config failed: %i\n", 309 __func__, status); 310 311 if (cflag & CRTSCTS) 312 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK, 313 SERIAL_CRTSCTS, 314 port_priv->device_port); 315 else 316 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK, 317 0, port_priv->device_port); 318 if (status < 0) 319 dev_err(&port->dev, "%s - set HW flow control failed: %i\n", 320 __func__, status); 321 322 if (I_IXOFF(tty) || I_IXON(tty)) { 323 u16 x = ((u16) (START_CHAR(tty) << 8) | (u16) (STOP_CHAR(tty))); 324 325 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK, 326 x, port_priv->device_port); 327 } else 328 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK, 329 0, port_priv->device_port); 330 331 if (status < 0) 332 dev_err(&port->dev, "%s - set SW flow control failed: %i\n", 333 __func__, status); 334 335 } 336 337 static int qt2_open(struct tty_struct *tty, struct usb_serial_port *port) 338 { 339 struct usb_serial *serial; 340 struct qt2_port_private *port_priv; 341 u8 *data; 342 u16 device_port; 343 int status; 344 unsigned long flags; 345 346 device_port = port->port_number; 347 348 serial = port->serial; 349 350 port_priv = usb_get_serial_port_data(port); 351 352 /* set the port to RS232 mode */ 353 status = qt2_control_msg(serial->dev, QT2_GET_SET_QMCR, 354 QT2_QMCR_RS232, device_port); 355 if (status < 0) { 356 dev_err(&port->dev, 357 "%s failed to set RS232 mode for port %i error %i\n", 358 __func__, device_port, status); 359 return status; 360 } 361 362 data = kzalloc(2, GFP_KERNEL); 363 if (!data) 364 return -ENOMEM; 365 366 /* open the port */ 367 status = usb_control_msg(serial->dev, 368 usb_rcvctrlpipe(serial->dev, 0), 369 QT_OPEN_CLOSE_CHANNEL, 370 0xc0, 0, 371 device_port, data, 2, QT2_USB_TIMEOUT); 372 373 if (status < 0) { 374 dev_err(&port->dev, "%s - open port failed %i", __func__, 375 status); 376 kfree(data); 377 return status; 378 } 379 380 spin_lock_irqsave(&port_priv->lock, flags); 381 port_priv->shadowLSR = data[0]; 382 port_priv->shadowMSR = data[1]; 383 spin_unlock_irqrestore(&port_priv->lock, flags); 384 385 kfree(data); 386 387 /* set to default speed and 8bit word size */ 388 status = qt2_set_port_config(serial->dev, device_port, 389 DEFAULT_BAUD_RATE, UART_LCR_WLEN8); 390 if (status < 0) { 391 dev_err(&port->dev, "%s - initial setup failed (%i)\n", 392 __func__, device_port); 393 return status; 394 } 395 396 port_priv->device_port = (u8) device_port; 397 398 if (tty) 399 qt2_set_termios(tty, port, &tty->termios); 400 401 return 0; 402 403 } 404 405 static void qt2_close(struct usb_serial_port *port) 406 { 407 struct usb_serial *serial; 408 struct qt2_port_private *port_priv; 409 unsigned long flags; 410 int i; 411 412 serial = port->serial; 413 port_priv = usb_get_serial_port_data(port); 414 415 spin_lock_irqsave(&port_priv->urb_lock, flags); 416 usb_kill_urb(port_priv->write_urb); 417 port_priv->urb_in_use = false; 418 spin_unlock_irqrestore(&port_priv->urb_lock, flags); 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 if (!retinfo) 465 return -EFAULT; 466 467 memset(&tmp, 0, sizeof(tmp)); 468 tmp.line = port->minor; 469 tmp.port = 0; 470 tmp.irq = 0; 471 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ; 472 tmp.xmit_fifo_size = port->bulk_out_size; 473 tmp.baud_base = 9600; 474 tmp.close_delay = 5*HZ; 475 tmp.closing_wait = 30*HZ; 476 477 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) 478 return -EFAULT; 479 return 0; 480 } 481 482 static int qt2_ioctl(struct tty_struct *tty, 483 unsigned int cmd, unsigned long arg) 484 { 485 struct usb_serial_port *port = tty->driver_data; 486 487 switch (cmd) { 488 case TIOCGSERIAL: 489 return get_serial_info(port, 490 (struct serial_struct __user *)arg); 491 default: 492 break; 493 } 494 495 return -ENOIOCTLCMD; 496 } 497 498 static void qt2_process_status(struct usb_serial_port *port, unsigned char *ch) 499 { 500 switch (*ch) { 501 case QT2_LINE_STATUS: 502 qt2_update_lsr(port, ch + 1); 503 break; 504 case QT2_MODEM_STATUS: 505 qt2_update_msr(port, ch + 1); 506 break; 507 } 508 } 509 510 /* not needed, kept to document functionality */ 511 static void qt2_process_xmit_empty(struct usb_serial_port *port, 512 unsigned char *ch) 513 { 514 int bytes_written; 515 516 bytes_written = (int)(*ch) + (int)(*(ch + 1) << 4); 517 } 518 519 /* not needed, kept to document functionality */ 520 static void qt2_process_flush(struct usb_serial_port *port, unsigned char *ch) 521 { 522 return; 523 } 524 525 static void qt2_process_read_urb(struct urb *urb) 526 { 527 struct usb_serial *serial; 528 struct qt2_serial_private *serial_priv; 529 struct usb_serial_port *port; 530 struct qt2_port_private *port_priv; 531 bool escapeflag; 532 unsigned char *ch; 533 int i; 534 unsigned char newport; 535 int len = urb->actual_length; 536 537 if (!len) 538 return; 539 540 ch = urb->transfer_buffer; 541 serial = urb->context; 542 serial_priv = usb_get_serial_data(serial); 543 port = serial->port[serial_priv->current_port]; 544 port_priv = usb_get_serial_port_data(port); 545 546 for (i = 0; i < urb->actual_length; i++) { 547 ch = (unsigned char *)urb->transfer_buffer + i; 548 if ((i <= (len - 3)) && 549 (*ch == QT2_CONTROL_BYTE) && 550 (*(ch + 1) == QT2_CONTROL_BYTE)) { 551 escapeflag = false; 552 switch (*(ch + 2)) { 553 case QT2_LINE_STATUS: 554 case QT2_MODEM_STATUS: 555 if (i > (len - 4)) { 556 dev_warn(&port->dev, 557 "%s - status message too short\n", 558 __func__); 559 break; 560 } 561 qt2_process_status(port, ch + 2); 562 i += 3; 563 escapeflag = true; 564 break; 565 case QT2_XMIT_HOLD: 566 if (i > (len - 5)) { 567 dev_warn(&port->dev, 568 "%s - xmit_empty message too short\n", 569 __func__); 570 break; 571 } 572 qt2_process_xmit_empty(port, ch + 3); 573 i += 4; 574 escapeflag = true; 575 break; 576 case QT2_CHANGE_PORT: 577 if (i > (len - 4)) { 578 dev_warn(&port->dev, 579 "%s - change_port message too short\n", 580 __func__); 581 break; 582 } 583 tty_flip_buffer_push(&port->port); 584 585 newport = *(ch + 3); 586 587 if (newport > serial->num_ports) { 588 dev_err(&port->dev, 589 "%s - port change to invalid port: %i\n", 590 __func__, newport); 591 break; 592 } 593 594 serial_priv->current_port = newport; 595 port = serial->port[serial_priv->current_port]; 596 port_priv = usb_get_serial_port_data(port); 597 i += 3; 598 escapeflag = true; 599 break; 600 case QT2_REC_FLUSH: 601 case QT2_XMIT_FLUSH: 602 qt2_process_flush(port, ch + 2); 603 i += 2; 604 escapeflag = true; 605 break; 606 case QT2_CONTROL_ESCAPE: 607 tty_buffer_request_room(&port->port, 2); 608 tty_insert_flip_string(&port->port, ch, 2); 609 i += 2; 610 escapeflag = true; 611 break; 612 default: 613 dev_warn(&port->dev, 614 "%s - unsupported command %i\n", 615 __func__, *(ch + 2)); 616 break; 617 } 618 if (escapeflag) 619 continue; 620 } 621 622 tty_buffer_request_room(&port->port, 1); 623 tty_insert_flip_string(&port->port, ch, 1); 624 } 625 626 tty_flip_buffer_push(&port->port); 627 } 628 629 static void qt2_write_bulk_callback(struct urb *urb) 630 { 631 struct usb_serial_port *port; 632 struct qt2_port_private *port_priv; 633 634 port = urb->context; 635 port_priv = usb_get_serial_port_data(port); 636 637 spin_lock(&port_priv->urb_lock); 638 639 port_priv->urb_in_use = false; 640 usb_serial_port_softint(port); 641 642 spin_unlock(&port_priv->urb_lock); 643 644 } 645 646 static void qt2_read_bulk_callback(struct urb *urb) 647 { 648 struct usb_serial *serial = urb->context; 649 int status; 650 651 if (urb->status) { 652 dev_warn(&serial->dev->dev, 653 "%s - non-zero urb status: %i\n", __func__, 654 urb->status); 655 return; 656 } 657 658 qt2_process_read_urb(urb); 659 660 status = usb_submit_urb(urb, GFP_ATOMIC); 661 if (status != 0) 662 dev_err(&serial->dev->dev, 663 "%s - resubmit read urb failed: %i\n", 664 __func__, status); 665 } 666 667 static int qt2_setup_urbs(struct usb_serial *serial) 668 { 669 struct usb_serial_port *port0; 670 struct qt2_serial_private *serial_priv; 671 int status; 672 673 port0 = serial->port[0]; 674 675 serial_priv = usb_get_serial_data(serial); 676 serial_priv->read_urb = usb_alloc_urb(0, GFP_KERNEL); 677 if (!serial_priv->read_urb) { 678 dev_err(&serial->dev->dev, "No free urbs available\n"); 679 return -ENOMEM; 680 } 681 682 usb_fill_bulk_urb(serial_priv->read_urb, serial->dev, 683 usb_rcvbulkpipe(serial->dev, 684 port0->bulk_in_endpointAddress), 685 serial_priv->read_buffer, 686 sizeof(serial_priv->read_buffer), 687 qt2_read_bulk_callback, serial); 688 689 status = usb_submit_urb(serial_priv->read_urb, GFP_KERNEL); 690 if (status != 0) { 691 dev_err(&serial->dev->dev, 692 "%s - submit read urb failed %i\n", __func__, status); 693 usb_free_urb(serial_priv->read_urb); 694 return status; 695 } 696 697 return 0; 698 } 699 700 static int qt2_attach(struct usb_serial *serial) 701 { 702 struct qt2_serial_private *serial_priv; 703 int status; 704 705 /* power on unit */ 706 status = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 707 0xc2, 0x40, 0x8000, 0, NULL, 0, 708 QT2_USB_TIMEOUT); 709 if (status < 0) { 710 dev_err(&serial->dev->dev, 711 "%s - failed to power on unit: %i\n", __func__, status); 712 return status; 713 } 714 715 serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL); 716 if (!serial_priv) { 717 dev_err(&serial->dev->dev, "%s - Out of memory\n", __func__); 718 return -ENOMEM; 719 } 720 721 usb_set_serial_data(serial, serial_priv); 722 723 status = qt2_setup_urbs(serial); 724 if (status != 0) 725 goto attach_failed; 726 727 return 0; 728 729 attach_failed: 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_urb = usb_alloc_urb(0, GFP_KERNEL); 749 if (!port_priv->write_urb) { 750 kfree(port_priv); 751 return -ENOMEM; 752 } 753 bEndpointAddress = serial->port[0]->bulk_out_endpointAddress; 754 usb_fill_bulk_urb(port_priv->write_urb, serial->dev, 755 usb_sndbulkpipe(serial->dev, bEndpointAddress), 756 port_priv->write_buffer, 757 sizeof(port_priv->write_buffer), 758 qt2_write_bulk_callback, port); 759 760 usb_set_serial_port_data(port, port_priv); 761 762 return 0; 763 } 764 765 static int qt2_port_remove(struct usb_serial_port *port) 766 { 767 struct qt2_port_private *port_priv; 768 769 port_priv = usb_get_serial_port_data(port); 770 usb_free_urb(port_priv->write_urb); 771 kfree(port_priv); 772 773 return 0; 774 } 775 776 static int qt2_tiocmget(struct tty_struct *tty) 777 { 778 struct usb_serial_port *port = tty->driver_data; 779 struct usb_device *dev = port->serial->dev; 780 struct qt2_port_private *port_priv = usb_get_serial_port_data(port); 781 u8 *d; 782 int r; 783 784 d = kzalloc(2, GFP_KERNEL); 785 if (!d) 786 return -ENOMEM; 787 788 r = qt2_getregister(dev, port_priv->device_port, UART_MCR, d); 789 if (r < 0) 790 goto mget_out; 791 792 r = qt2_getregister(dev, port_priv->device_port, UART_MSR, d + 1); 793 if (r < 0) 794 goto mget_out; 795 796 r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) | 797 (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) | 798 (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) | 799 (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) | 800 (d[1] & UART_MSR_RI ? TIOCM_RI : 0) | 801 (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0); 802 803 mget_out: 804 kfree(d); 805 return r; 806 } 807 808 static int qt2_tiocmset(struct tty_struct *tty, 809 unsigned int set, unsigned int clear) 810 { 811 struct qt2_port_private *port_priv; 812 813 port_priv = usb_get_serial_port_data(tty->driver_data); 814 return update_mctrl(port_priv, set, clear); 815 } 816 817 static void qt2_break_ctl(struct tty_struct *tty, int break_state) 818 { 819 struct usb_serial_port *port = tty->driver_data; 820 struct qt2_port_private *port_priv; 821 int status; 822 u16 val; 823 824 port_priv = usb_get_serial_port_data(port); 825 826 val = (break_state == -1) ? 1 : 0; 827 828 status = qt2_control_msg(port->serial->dev, QT2_BREAK_CONTROL, 829 val, port_priv->device_port); 830 if (status < 0) 831 dev_warn(&port->dev, 832 "%s - failed to send control message: %i\n", __func__, 833 status); 834 } 835 836 837 838 static void qt2_dtr_rts(struct usb_serial_port *port, int on) 839 { 840 struct usb_device *dev = port->serial->dev; 841 struct qt2_port_private *port_priv = usb_get_serial_port_data(port); 842 843 /* Disable flow control */ 844 if (!on) { 845 if (qt2_setregister(dev, port_priv->device_port, 846 UART_MCR, 0) < 0) 847 dev_warn(&port->dev, "error from flowcontrol urb\n"); 848 } 849 /* drop RTS and DTR */ 850 if (on) 851 update_mctrl(port_priv, TIOCM_DTR | TIOCM_RTS, 0); 852 else 853 update_mctrl(port_priv, 0, TIOCM_DTR | TIOCM_RTS); 854 } 855 856 static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch) 857 { 858 struct qt2_port_private *port_priv; 859 u8 newMSR = (u8) *ch; 860 unsigned long flags; 861 862 port_priv = usb_get_serial_port_data(port); 863 864 spin_lock_irqsave(&port_priv->lock, flags); 865 port_priv->shadowMSR = newMSR; 866 spin_unlock_irqrestore(&port_priv->lock, flags); 867 868 if (newMSR & UART_MSR_ANY_DELTA) { 869 /* update input line counters */ 870 if (newMSR & UART_MSR_DCTS) 871 port->icount.cts++; 872 if (newMSR & UART_MSR_DDSR) 873 port->icount.dsr++; 874 if (newMSR & UART_MSR_DDCD) 875 port->icount.dcd++; 876 if (newMSR & UART_MSR_TERI) 877 port->icount.rng++; 878 879 wake_up_interruptible(&port->port.delta_msr_wait); 880 } 881 } 882 883 static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch) 884 { 885 struct qt2_port_private *port_priv; 886 struct async_icount *icount; 887 unsigned long flags; 888 u8 newLSR = (u8) *ch; 889 890 port_priv = usb_get_serial_port_data(port); 891 892 if (newLSR & UART_LSR_BI) 893 newLSR &= (u8) (UART_LSR_OE | UART_LSR_BI); 894 895 spin_lock_irqsave(&port_priv->lock, flags); 896 port_priv->shadowLSR = newLSR; 897 spin_unlock_irqrestore(&port_priv->lock, flags); 898 899 icount = &port->icount; 900 901 if (newLSR & UART_LSR_BRK_ERROR_BITS) { 902 903 if (newLSR & UART_LSR_BI) 904 icount->brk++; 905 906 if (newLSR & UART_LSR_OE) 907 icount->overrun++; 908 909 if (newLSR & UART_LSR_PE) 910 icount->parity++; 911 912 if (newLSR & UART_LSR_FE) 913 icount->frame++; 914 } 915 916 } 917 918 static int qt2_write_room(struct tty_struct *tty) 919 { 920 struct usb_serial_port *port = tty->driver_data; 921 struct qt2_port_private *port_priv; 922 unsigned long flags = 0; 923 int r; 924 925 port_priv = usb_get_serial_port_data(port); 926 927 spin_lock_irqsave(&port_priv->urb_lock, flags); 928 929 if (port_priv->urb_in_use) 930 r = 0; 931 else 932 r = QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE; 933 934 spin_unlock_irqrestore(&port_priv->urb_lock, flags); 935 936 return r; 937 } 938 939 static int qt2_write(struct tty_struct *tty, 940 struct usb_serial_port *port, 941 const unsigned char *buf, int count) 942 { 943 struct qt2_port_private *port_priv; 944 struct urb *write_urb; 945 unsigned char *data; 946 unsigned long flags; 947 int status; 948 int bytes_out = 0; 949 950 port_priv = usb_get_serial_port_data(port); 951 952 if (port_priv->write_urb == NULL) { 953 dev_err(&port->dev, "%s - no output urb\n", __func__); 954 return 0; 955 } 956 write_urb = port_priv->write_urb; 957 958 count = min(count, QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE); 959 960 data = write_urb->transfer_buffer; 961 spin_lock_irqsave(&port_priv->urb_lock, flags); 962 if (port_priv->urb_in_use == true) { 963 dev_err(&port->dev, "qt2_write - urb is in use\n"); 964 goto write_out; 965 } 966 967 *data++ = QT2_CONTROL_BYTE; 968 *data++ = QT2_CONTROL_BYTE; 969 *data++ = port_priv->device_port; 970 put_unaligned_le16(count, data); 971 data += 2; 972 memcpy(data, buf, count); 973 974 write_urb->transfer_buffer_length = count + QT2_WRITE_CONTROL_SIZE; 975 976 status = usb_submit_urb(write_urb, GFP_ATOMIC); 977 if (status == 0) { 978 port_priv->urb_in_use = true; 979 bytes_out += count; 980 } 981 982 write_out: 983 spin_unlock_irqrestore(&port_priv->urb_lock, flags); 984 return bytes_out; 985 } 986 987 988 static struct usb_serial_driver qt2_device = { 989 .driver = { 990 .owner = THIS_MODULE, 991 .name = "quatech-serial", 992 }, 993 .description = DRIVER_DESC, 994 .id_table = id_table, 995 .open = qt2_open, 996 .close = qt2_close, 997 .write = qt2_write, 998 .write_room = qt2_write_room, 999 .calc_num_ports = qt2_calc_num_ports, 1000 .attach = qt2_attach, 1001 .release = qt2_release, 1002 .disconnect = qt2_disconnect, 1003 .port_probe = qt2_port_probe, 1004 .port_remove = qt2_port_remove, 1005 .dtr_rts = qt2_dtr_rts, 1006 .break_ctl = qt2_break_ctl, 1007 .tiocmget = qt2_tiocmget, 1008 .tiocmset = qt2_tiocmset, 1009 .tiocmiwait = usb_serial_generic_tiocmiwait, 1010 .get_icount = usb_serial_generic_get_icount, 1011 .ioctl = qt2_ioctl, 1012 .set_termios = qt2_set_termios, 1013 }; 1014 1015 static struct usb_serial_driver *const serial_drivers[] = { 1016 &qt2_device, NULL 1017 }; 1018 1019 module_usb_serial_driver(serial_drivers, id_table); 1020 1021 MODULE_DESCRIPTION(DRIVER_DESC); 1022 MODULE_LICENSE("GPL"); 1023