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_getdevice(struct usb_device *dev, u8 *data) 192 { 193 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), 194 QT_SET_GET_DEVICE, 0xc0, 0, 0, 195 data, 3, QT2_USB_TIMEOUT); 196 } 197 198 static inline int qt2_getregister(struct usb_device *dev, 199 u8 uart, 200 u8 reg, 201 u8 *data) 202 { 203 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), 204 QT_SET_GET_REGISTER, 0xc0, reg, 205 uart, data, sizeof(*data), QT2_USB_TIMEOUT); 206 207 } 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 < 0) { 376 dev_err(&port->dev, "%s - open port failed %i\n", __func__, 377 status); 378 kfree(data); 379 return status; 380 } 381 382 spin_lock_irqsave(&port_priv->lock, flags); 383 port_priv->shadowLSR = data[0]; 384 port_priv->shadowMSR = data[1]; 385 spin_unlock_irqrestore(&port_priv->lock, flags); 386 387 kfree(data); 388 389 /* set to default speed and 8bit word size */ 390 status = qt2_set_port_config(serial->dev, device_port, 391 DEFAULT_BAUD_RATE, UART_LCR_WLEN8); 392 if (status < 0) { 393 dev_err(&port->dev, "%s - initial setup failed (%i)\n", 394 __func__, device_port); 395 return status; 396 } 397 398 port_priv->device_port = (u8) device_port; 399 400 if (tty) 401 qt2_set_termios(tty, port, &tty->termios); 402 403 return 0; 404 405 } 406 407 static void qt2_close(struct usb_serial_port *port) 408 { 409 struct usb_serial *serial; 410 struct qt2_port_private *port_priv; 411 unsigned long flags; 412 int i; 413 414 serial = port->serial; 415 port_priv = usb_get_serial_port_data(port); 416 417 spin_lock_irqsave(&port_priv->urb_lock, flags); 418 usb_kill_urb(port_priv->write_urb); 419 port_priv->urb_in_use = false; 420 spin_unlock_irqrestore(&port_priv->urb_lock, flags); 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 if (!retinfo) 467 return -EFAULT; 468 469 memset(&tmp, 0, sizeof(tmp)); 470 tmp.line = port->minor; 471 tmp.port = 0; 472 tmp.irq = 0; 473 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ; 474 tmp.xmit_fifo_size = port->bulk_out_size; 475 tmp.baud_base = 9600; 476 tmp.close_delay = 5*HZ; 477 tmp.closing_wait = 30*HZ; 478 479 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) 480 return -EFAULT; 481 return 0; 482 } 483 484 static int qt2_ioctl(struct tty_struct *tty, 485 unsigned int cmd, unsigned long arg) 486 { 487 struct usb_serial_port *port = tty->driver_data; 488 489 switch (cmd) { 490 case TIOCGSERIAL: 491 return get_serial_info(port, 492 (struct serial_struct __user *)arg); 493 default: 494 break; 495 } 496 497 return -ENOIOCTLCMD; 498 } 499 500 static void qt2_process_status(struct usb_serial_port *port, unsigned char *ch) 501 { 502 switch (*ch) { 503 case QT2_LINE_STATUS: 504 qt2_update_lsr(port, ch + 1); 505 break; 506 case QT2_MODEM_STATUS: 507 qt2_update_msr(port, ch + 1); 508 break; 509 } 510 } 511 512 /* not needed, kept to document functionality */ 513 static void qt2_process_xmit_empty(struct usb_serial_port *port, 514 unsigned char *ch) 515 { 516 int bytes_written; 517 518 bytes_written = (int)(*ch) + (int)(*(ch + 1) << 4); 519 } 520 521 /* not needed, kept to document functionality */ 522 static void qt2_process_flush(struct usb_serial_port *port, unsigned char *ch) 523 { 524 return; 525 } 526 527 static void qt2_process_read_urb(struct urb *urb) 528 { 529 struct usb_serial *serial; 530 struct qt2_serial_private *serial_priv; 531 struct usb_serial_port *port; 532 struct qt2_port_private *port_priv; 533 bool escapeflag; 534 unsigned char *ch; 535 int i; 536 unsigned char newport; 537 int len = urb->actual_length; 538 539 if (!len) 540 return; 541 542 ch = urb->transfer_buffer; 543 serial = urb->context; 544 serial_priv = usb_get_serial_data(serial); 545 port = serial->port[serial_priv->current_port]; 546 port_priv = usb_get_serial_port_data(port); 547 548 for (i = 0; i < urb->actual_length; i++) { 549 ch = (unsigned char *)urb->transfer_buffer + i; 550 if ((i <= (len - 3)) && 551 (*ch == QT2_CONTROL_BYTE) && 552 (*(ch + 1) == QT2_CONTROL_BYTE)) { 553 escapeflag = false; 554 switch (*(ch + 2)) { 555 case QT2_LINE_STATUS: 556 case QT2_MODEM_STATUS: 557 if (i > (len - 4)) { 558 dev_warn(&port->dev, 559 "%s - status message too short\n", 560 __func__); 561 break; 562 } 563 qt2_process_status(port, ch + 2); 564 i += 3; 565 escapeflag = true; 566 break; 567 case QT2_XMIT_HOLD: 568 if (i > (len - 5)) { 569 dev_warn(&port->dev, 570 "%s - xmit_empty message too short\n", 571 __func__); 572 break; 573 } 574 qt2_process_xmit_empty(port, ch + 3); 575 i += 4; 576 escapeflag = true; 577 break; 578 case QT2_CHANGE_PORT: 579 if (i > (len - 4)) { 580 dev_warn(&port->dev, 581 "%s - change_port message too short\n", 582 __func__); 583 break; 584 } 585 tty_flip_buffer_push(&port->port); 586 587 newport = *(ch + 3); 588 589 if (newport > serial->num_ports) { 590 dev_err(&port->dev, 591 "%s - port change to invalid port: %i\n", 592 __func__, newport); 593 break; 594 } 595 596 serial_priv->current_port = newport; 597 port = serial->port[serial_priv->current_port]; 598 port_priv = usb_get_serial_port_data(port); 599 i += 3; 600 escapeflag = true; 601 break; 602 case QT2_REC_FLUSH: 603 case QT2_XMIT_FLUSH: 604 qt2_process_flush(port, ch + 2); 605 i += 2; 606 escapeflag = true; 607 break; 608 case QT2_CONTROL_ESCAPE: 609 tty_buffer_request_room(&port->port, 2); 610 tty_insert_flip_string(&port->port, ch, 2); 611 i += 2; 612 escapeflag = true; 613 break; 614 default: 615 dev_warn(&port->dev, 616 "%s - unsupported command %i\n", 617 __func__, *(ch + 2)); 618 break; 619 } 620 if (escapeflag) 621 continue; 622 } 623 624 tty_buffer_request_room(&port->port, 1); 625 tty_insert_flip_string(&port->port, ch, 1); 626 } 627 628 tty_flip_buffer_push(&port->port); 629 } 630 631 static void qt2_write_bulk_callback(struct urb *urb) 632 { 633 struct usb_serial_port *port; 634 struct qt2_port_private *port_priv; 635 636 port = urb->context; 637 port_priv = usb_get_serial_port_data(port); 638 639 spin_lock(&port_priv->urb_lock); 640 641 port_priv->urb_in_use = false; 642 usb_serial_port_softint(port); 643 644 spin_unlock(&port_priv->urb_lock); 645 646 } 647 648 static void qt2_read_bulk_callback(struct urb *urb) 649 { 650 struct usb_serial *serial = urb->context; 651 int status; 652 653 if (urb->status) { 654 dev_warn(&serial->dev->dev, 655 "%s - non-zero urb status: %i\n", __func__, 656 urb->status); 657 return; 658 } 659 660 qt2_process_read_urb(urb); 661 662 status = usb_submit_urb(urb, GFP_ATOMIC); 663 if (status != 0) 664 dev_err(&serial->dev->dev, 665 "%s - resubmit read urb failed: %i\n", 666 __func__, status); 667 } 668 669 static int qt2_setup_urbs(struct usb_serial *serial) 670 { 671 struct usb_serial_port *port0; 672 struct qt2_serial_private *serial_priv; 673 int status; 674 675 port0 = serial->port[0]; 676 677 serial_priv = usb_get_serial_data(serial); 678 serial_priv->read_urb = usb_alloc_urb(0, GFP_KERNEL); 679 if (!serial_priv->read_urb) 680 return -ENOMEM; 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 QT2_READ_BUFFER_SIZE, 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 return -ENOMEM; 718 719 serial_priv->read_buffer = kmalloc(QT2_READ_BUFFER_SIZE, GFP_KERNEL); 720 if (!serial_priv->read_buffer) { 721 status = -ENOMEM; 722 goto err_buf; 723 } 724 725 usb_set_serial_data(serial, serial_priv); 726 727 status = qt2_setup_urbs(serial); 728 if (status != 0) 729 goto attach_failed; 730 731 return 0; 732 733 attach_failed: 734 kfree(serial_priv->read_buffer); 735 err_buf: 736 kfree(serial_priv); 737 return status; 738 } 739 740 static int qt2_port_probe(struct usb_serial_port *port) 741 { 742 struct usb_serial *serial = port->serial; 743 struct qt2_port_private *port_priv; 744 u8 bEndpointAddress; 745 746 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL); 747 if (!port_priv) 748 return -ENOMEM; 749 750 spin_lock_init(&port_priv->lock); 751 spin_lock_init(&port_priv->urb_lock); 752 port_priv->port = port; 753 754 port_priv->write_buffer = kmalloc(QT2_WRITE_BUFFER_SIZE, GFP_KERNEL); 755 if (!port_priv->write_buffer) 756 goto err_buf; 757 758 port_priv->write_urb = usb_alloc_urb(0, GFP_KERNEL); 759 if (!port_priv->write_urb) 760 goto err_urb; 761 762 bEndpointAddress = serial->port[0]->bulk_out_endpointAddress; 763 usb_fill_bulk_urb(port_priv->write_urb, serial->dev, 764 usb_sndbulkpipe(serial->dev, bEndpointAddress), 765 port_priv->write_buffer, 766 QT2_WRITE_BUFFER_SIZE, 767 qt2_write_bulk_callback, port); 768 769 usb_set_serial_port_data(port, port_priv); 770 771 return 0; 772 err_urb: 773 kfree(port_priv->write_buffer); 774 err_buf: 775 kfree(port_priv); 776 return -ENOMEM; 777 } 778 779 static int qt2_port_remove(struct usb_serial_port *port) 780 { 781 struct qt2_port_private *port_priv; 782 783 port_priv = usb_get_serial_port_data(port); 784 usb_free_urb(port_priv->write_urb); 785 kfree(port_priv->write_buffer); 786 kfree(port_priv); 787 788 return 0; 789 } 790 791 static int qt2_tiocmget(struct tty_struct *tty) 792 { 793 struct usb_serial_port *port = tty->driver_data; 794 struct usb_device *dev = port->serial->dev; 795 struct qt2_port_private *port_priv = usb_get_serial_port_data(port); 796 u8 *d; 797 int r; 798 799 d = kzalloc(2, GFP_KERNEL); 800 if (!d) 801 return -ENOMEM; 802 803 r = qt2_getregister(dev, port_priv->device_port, UART_MCR, d); 804 if (r < 0) 805 goto mget_out; 806 807 r = qt2_getregister(dev, port_priv->device_port, UART_MSR, d + 1); 808 if (r < 0) 809 goto mget_out; 810 811 r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) | 812 (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) | 813 (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) | 814 (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) | 815 (d[1] & UART_MSR_RI ? TIOCM_RI : 0) | 816 (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0); 817 818 mget_out: 819 kfree(d); 820 return r; 821 } 822 823 static int qt2_tiocmset(struct tty_struct *tty, 824 unsigned int set, unsigned int clear) 825 { 826 struct qt2_port_private *port_priv; 827 828 port_priv = usb_get_serial_port_data(tty->driver_data); 829 return update_mctrl(port_priv, set, clear); 830 } 831 832 static void qt2_break_ctl(struct tty_struct *tty, int break_state) 833 { 834 struct usb_serial_port *port = tty->driver_data; 835 struct qt2_port_private *port_priv; 836 int status; 837 u16 val; 838 839 port_priv = usb_get_serial_port_data(port); 840 841 val = (break_state == -1) ? 1 : 0; 842 843 status = qt2_control_msg(port->serial->dev, QT2_BREAK_CONTROL, 844 val, port_priv->device_port); 845 if (status < 0) 846 dev_warn(&port->dev, 847 "%s - failed to send control message: %i\n", __func__, 848 status); 849 } 850 851 852 853 static void qt2_dtr_rts(struct usb_serial_port *port, int on) 854 { 855 struct usb_device *dev = port->serial->dev; 856 struct qt2_port_private *port_priv = usb_get_serial_port_data(port); 857 858 /* Disable flow control */ 859 if (!on) { 860 if (qt2_setregister(dev, port_priv->device_port, 861 UART_MCR, 0) < 0) 862 dev_warn(&port->dev, "error from flowcontrol urb\n"); 863 } 864 /* drop RTS and DTR */ 865 if (on) 866 update_mctrl(port_priv, TIOCM_DTR | TIOCM_RTS, 0); 867 else 868 update_mctrl(port_priv, 0, TIOCM_DTR | TIOCM_RTS); 869 } 870 871 static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch) 872 { 873 struct qt2_port_private *port_priv; 874 u8 newMSR = (u8) *ch; 875 unsigned long flags; 876 877 port_priv = usb_get_serial_port_data(port); 878 879 spin_lock_irqsave(&port_priv->lock, flags); 880 port_priv->shadowMSR = newMSR; 881 spin_unlock_irqrestore(&port_priv->lock, flags); 882 883 if (newMSR & UART_MSR_ANY_DELTA) { 884 /* update input line counters */ 885 if (newMSR & UART_MSR_DCTS) 886 port->icount.cts++; 887 if (newMSR & UART_MSR_DDSR) 888 port->icount.dsr++; 889 if (newMSR & UART_MSR_DDCD) 890 port->icount.dcd++; 891 if (newMSR & UART_MSR_TERI) 892 port->icount.rng++; 893 894 wake_up_interruptible(&port->port.delta_msr_wait); 895 } 896 } 897 898 static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch) 899 { 900 struct qt2_port_private *port_priv; 901 struct async_icount *icount; 902 unsigned long flags; 903 u8 newLSR = (u8) *ch; 904 905 port_priv = usb_get_serial_port_data(port); 906 907 if (newLSR & UART_LSR_BI) 908 newLSR &= (u8) (UART_LSR_OE | UART_LSR_BI); 909 910 spin_lock_irqsave(&port_priv->lock, flags); 911 port_priv->shadowLSR = newLSR; 912 spin_unlock_irqrestore(&port_priv->lock, flags); 913 914 icount = &port->icount; 915 916 if (newLSR & UART_LSR_BRK_ERROR_BITS) { 917 918 if (newLSR & UART_LSR_BI) 919 icount->brk++; 920 921 if (newLSR & UART_LSR_OE) 922 icount->overrun++; 923 924 if (newLSR & UART_LSR_PE) 925 icount->parity++; 926 927 if (newLSR & UART_LSR_FE) 928 icount->frame++; 929 } 930 931 } 932 933 static int qt2_write_room(struct tty_struct *tty) 934 { 935 struct usb_serial_port *port = tty->driver_data; 936 struct qt2_port_private *port_priv; 937 unsigned long flags = 0; 938 int r; 939 940 port_priv = usb_get_serial_port_data(port); 941 942 spin_lock_irqsave(&port_priv->urb_lock, flags); 943 944 if (port_priv->urb_in_use) 945 r = 0; 946 else 947 r = QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE; 948 949 spin_unlock_irqrestore(&port_priv->urb_lock, flags); 950 951 return r; 952 } 953 954 static int qt2_write(struct tty_struct *tty, 955 struct usb_serial_port *port, 956 const unsigned char *buf, int count) 957 { 958 struct qt2_port_private *port_priv; 959 struct urb *write_urb; 960 unsigned char *data; 961 unsigned long flags; 962 int status; 963 int bytes_out = 0; 964 965 port_priv = usb_get_serial_port_data(port); 966 967 if (port_priv->write_urb == NULL) { 968 dev_err(&port->dev, "%s - no output urb\n", __func__); 969 return 0; 970 } 971 write_urb = port_priv->write_urb; 972 973 count = min(count, QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE); 974 975 data = write_urb->transfer_buffer; 976 spin_lock_irqsave(&port_priv->urb_lock, flags); 977 if (port_priv->urb_in_use) { 978 dev_err(&port->dev, "qt2_write - urb is in use\n"); 979 goto write_out; 980 } 981 982 *data++ = QT2_CONTROL_BYTE; 983 *data++ = QT2_CONTROL_BYTE; 984 *data++ = port_priv->device_port; 985 put_unaligned_le16(count, data); 986 data += 2; 987 memcpy(data, buf, count); 988 989 write_urb->transfer_buffer_length = count + QT2_WRITE_CONTROL_SIZE; 990 991 status = usb_submit_urb(write_urb, GFP_ATOMIC); 992 if (status == 0) { 993 port_priv->urb_in_use = true; 994 bytes_out += count; 995 } 996 997 write_out: 998 spin_unlock_irqrestore(&port_priv->urb_lock, flags); 999 return bytes_out; 1000 } 1001 1002 1003 static struct usb_serial_driver qt2_device = { 1004 .driver = { 1005 .owner = THIS_MODULE, 1006 .name = "quatech-serial", 1007 }, 1008 .description = DRIVER_DESC, 1009 .id_table = id_table, 1010 .open = qt2_open, 1011 .close = qt2_close, 1012 .write = qt2_write, 1013 .write_room = qt2_write_room, 1014 .calc_num_ports = qt2_calc_num_ports, 1015 .attach = qt2_attach, 1016 .release = qt2_release, 1017 .disconnect = qt2_disconnect, 1018 .port_probe = qt2_port_probe, 1019 .port_remove = qt2_port_remove, 1020 .dtr_rts = qt2_dtr_rts, 1021 .break_ctl = qt2_break_ctl, 1022 .tiocmget = qt2_tiocmget, 1023 .tiocmset = qt2_tiocmset, 1024 .tiocmiwait = usb_serial_generic_tiocmiwait, 1025 .get_icount = usb_serial_generic_get_icount, 1026 .ioctl = qt2_ioctl, 1027 .set_termios = qt2_set_termios, 1028 }; 1029 1030 static struct usb_serial_driver *const serial_drivers[] = { 1031 &qt2_device, NULL 1032 }; 1033 1034 module_usb_serial_driver(serial_drivers, id_table); 1035 1036 MODULE_DESCRIPTION(DRIVER_DESC); 1037 MODULE_LICENSE("GPL"); 1038