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_free_urb(serial_priv->read_urb); 145 kfree(serial_priv->read_buffer); 146 kfree(serial_priv); 147 } 148 149 static inline int calc_baud_divisor(int baudrate) 150 { 151 int divisor, rem; 152 153 divisor = MAX_BAUD_RATE / baudrate; 154 rem = MAX_BAUD_RATE % baudrate; 155 /* Round to nearest divisor */ 156 if (((rem * 2) >= baudrate) && (baudrate != 110)) 157 divisor++; 158 159 return divisor; 160 } 161 162 static inline int qt2_set_port_config(struct usb_device *dev, 163 unsigned char port_number, 164 u16 baudrate, u16 lcr) 165 { 166 int divisor = calc_baud_divisor(baudrate); 167 u16 index = ((u16) (lcr << 8) | (u16) (port_number)); 168 169 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), 170 QT2_GET_SET_UART, 0x40, 171 divisor, index, NULL, 0, QT2_USB_TIMEOUT); 172 } 173 174 static inline int qt2_control_msg(struct usb_device *dev, 175 u8 request, u16 data, u16 index) 176 { 177 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), 178 request, 0x40, data, index, 179 NULL, 0, QT2_USB_TIMEOUT); 180 } 181 182 static inline int qt2_setdevice(struct usb_device *dev, u8 *data) 183 { 184 u16 x = ((u16) (data[1] << 8) | (u16) (data[0])); 185 186 return qt2_control_msg(dev, QT_SET_GET_DEVICE, x, 0); 187 } 188 189 190 static inline int qt2_getdevice(struct usb_device *dev, u8 *data) 191 { 192 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), 193 QT_SET_GET_DEVICE, 0xc0, 0, 0, 194 data, 3, QT2_USB_TIMEOUT); 195 } 196 197 static inline int qt2_getregister(struct usb_device *dev, 198 u8 uart, 199 u8 reg, 200 u8 *data) 201 { 202 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), 203 QT_SET_GET_REGISTER, 0xc0, reg, 204 uart, data, sizeof(*data), QT2_USB_TIMEOUT); 205 206 } 207 208 static inline int qt2_setregister(struct usb_device *dev, 209 u8 uart, u8 reg, u16 data) 210 { 211 u16 value = (data << 8) | reg; 212 213 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), 214 QT_SET_GET_REGISTER, 0x40, value, uart, 215 NULL, 0, QT2_USB_TIMEOUT); 216 } 217 218 static inline int update_mctrl(struct qt2_port_private *port_priv, 219 unsigned int set, unsigned int clear) 220 { 221 struct usb_serial_port *port = port_priv->port; 222 struct usb_device *dev = port->serial->dev; 223 unsigned urb_value; 224 int status; 225 226 if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0) { 227 dev_dbg(&port->dev, 228 "update_mctrl - DTR|RTS not being set|cleared\n"); 229 return 0; /* no change */ 230 } 231 232 clear &= ~set; /* 'set' takes precedence over 'clear' */ 233 urb_value = 0; 234 if (set & TIOCM_DTR) 235 urb_value |= UART_MCR_DTR; 236 if (set & TIOCM_RTS) 237 urb_value |= UART_MCR_RTS; 238 239 status = qt2_setregister(dev, port_priv->device_port, UART_MCR, 240 urb_value); 241 if (status < 0) 242 dev_err(&port->dev, 243 "update_mctrl - Error from MODEM_CTRL urb: %i\n", 244 status); 245 return status; 246 } 247 248 static int qt2_calc_num_ports(struct usb_serial *serial) 249 { 250 struct qt2_device_detail d; 251 int i; 252 253 for (i = 0; d = qt2_device_details[i], d.product_id != 0; i++) { 254 if (d.product_id == le16_to_cpu(serial->dev->descriptor.idProduct)) 255 return d.num_ports; 256 } 257 258 /* we didn't recognize the device */ 259 dev_err(&serial->dev->dev, 260 "don't know the number of ports, assuming 1\n"); 261 262 return 1; 263 } 264 265 static void qt2_set_termios(struct tty_struct *tty, 266 struct usb_serial_port *port, 267 struct ktermios *old_termios) 268 { 269 struct usb_device *dev = port->serial->dev; 270 struct qt2_port_private *port_priv; 271 struct ktermios *termios = &tty->termios; 272 u16 baud; 273 unsigned int cflag = termios->c_cflag; 274 u16 new_lcr = 0; 275 int status; 276 277 port_priv = usb_get_serial_port_data(port); 278 279 if (cflag & PARENB) { 280 if (cflag & PARODD) 281 new_lcr |= UART_LCR_PARITY; 282 else 283 new_lcr |= SERIAL_EVEN_PARITY; 284 } 285 286 switch (cflag & CSIZE) { 287 case CS5: 288 new_lcr |= UART_LCR_WLEN5; 289 break; 290 case CS6: 291 new_lcr |= UART_LCR_WLEN6; 292 break; 293 case CS7: 294 new_lcr |= UART_LCR_WLEN7; 295 break; 296 default: 297 case CS8: 298 new_lcr |= UART_LCR_WLEN8; 299 break; 300 } 301 302 baud = tty_get_baud_rate(tty); 303 if (!baud) 304 baud = 9600; 305 306 status = qt2_set_port_config(dev, port_priv->device_port, baud, 307 new_lcr); 308 if (status < 0) 309 dev_err(&port->dev, "%s - qt2_set_port_config failed: %i\n", 310 __func__, status); 311 312 if (cflag & CRTSCTS) 313 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK, 314 SERIAL_CRTSCTS, 315 port_priv->device_port); 316 else 317 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK, 318 0, port_priv->device_port); 319 if (status < 0) 320 dev_err(&port->dev, "%s - set HW flow control failed: %i\n", 321 __func__, status); 322 323 if (I_IXOFF(tty) || I_IXON(tty)) { 324 u16 x = ((u16) (START_CHAR(tty) << 8) | (u16) (STOP_CHAR(tty))); 325 326 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK, 327 x, port_priv->device_port); 328 } else 329 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK, 330 0, port_priv->device_port); 331 332 if (status < 0) 333 dev_err(&port->dev, "%s - set SW flow control failed: %i\n", 334 __func__, status); 335 336 } 337 338 static int qt2_open(struct tty_struct *tty, struct usb_serial_port *port) 339 { 340 struct usb_serial *serial; 341 struct qt2_port_private *port_priv; 342 u8 *data; 343 u16 device_port; 344 int status; 345 unsigned long flags; 346 347 device_port = port->port_number; 348 349 serial = port->serial; 350 351 port_priv = usb_get_serial_port_data(port); 352 353 /* set the port to RS232 mode */ 354 status = qt2_control_msg(serial->dev, QT2_GET_SET_QMCR, 355 QT2_QMCR_RS232, device_port); 356 if (status < 0) { 357 dev_err(&port->dev, 358 "%s failed to set RS232 mode for port %i error %i\n", 359 __func__, device_port, status); 360 return status; 361 } 362 363 data = kzalloc(2, GFP_KERNEL); 364 if (!data) 365 return -ENOMEM; 366 367 /* open the port */ 368 status = usb_control_msg(serial->dev, 369 usb_rcvctrlpipe(serial->dev, 0), 370 QT_OPEN_CLOSE_CHANNEL, 371 0xc0, 0, 372 device_port, data, 2, QT2_USB_TIMEOUT); 373 374 if (status < 0) { 375 dev_err(&port->dev, "%s - open port failed %i\n", __func__, 376 status); 377 kfree(data); 378 return status; 379 } 380 381 spin_lock_irqsave(&port_priv->lock, flags); 382 port_priv->shadowLSR = data[0]; 383 port_priv->shadowMSR = data[1]; 384 spin_unlock_irqrestore(&port_priv->lock, flags); 385 386 kfree(data); 387 388 /* set to default speed and 8bit word size */ 389 status = qt2_set_port_config(serial->dev, device_port, 390 DEFAULT_BAUD_RATE, UART_LCR_WLEN8); 391 if (status < 0) { 392 dev_err(&port->dev, "%s - initial setup failed (%i)\n", 393 __func__, device_port); 394 return status; 395 } 396 397 port_priv->device_port = (u8) device_port; 398 399 if (tty) 400 qt2_set_termios(tty, port, &tty->termios); 401 402 return 0; 403 404 } 405 406 static void qt2_close(struct usb_serial_port *port) 407 { 408 struct usb_serial *serial; 409 struct qt2_port_private *port_priv; 410 unsigned long flags; 411 int i; 412 413 serial = port->serial; 414 port_priv = usb_get_serial_port_data(port); 415 416 spin_lock_irqsave(&port_priv->urb_lock, flags); 417 usb_kill_urb(port_priv->write_urb); 418 port_priv->urb_in_use = false; 419 spin_unlock_irqrestore(&port_priv->urb_lock, flags); 420 421 /* flush the port transmit buffer */ 422 i = usb_control_msg(serial->dev, 423 usb_rcvctrlpipe(serial->dev, 0), 424 QT2_FLUSH_DEVICE, 0x40, 1, 425 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT); 426 427 if (i < 0) 428 dev_err(&port->dev, "%s - transmit buffer flush failed: %i\n", 429 __func__, i); 430 431 /* flush the port receive buffer */ 432 i = usb_control_msg(serial->dev, 433 usb_rcvctrlpipe(serial->dev, 0), 434 QT2_FLUSH_DEVICE, 0x40, 0, 435 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT); 436 437 if (i < 0) 438 dev_err(&port->dev, "%s - receive buffer flush failed: %i\n", 439 __func__, i); 440 441 /* close the port */ 442 i = usb_control_msg(serial->dev, 443 usb_sndctrlpipe(serial->dev, 0), 444 QT_OPEN_CLOSE_CHANNEL, 445 0x40, 0, 446 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT); 447 448 if (i < 0) 449 dev_err(&port->dev, "%s - close port failed %i\n", 450 __func__, i); 451 } 452 453 static void qt2_disconnect(struct usb_serial *serial) 454 { 455 struct qt2_serial_private *serial_priv = usb_get_serial_data(serial); 456 457 usb_kill_urb(serial_priv->read_urb); 458 } 459 460 static int get_serial_info(struct usb_serial_port *port, 461 struct serial_struct __user *retinfo) 462 { 463 struct serial_struct tmp; 464 465 if (!retinfo) 466 return -EFAULT; 467 468 memset(&tmp, 0, sizeof(tmp)); 469 tmp.line = port->minor; 470 tmp.port = 0; 471 tmp.irq = 0; 472 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ; 473 tmp.xmit_fifo_size = port->bulk_out_size; 474 tmp.baud_base = 9600; 475 tmp.close_delay = 5*HZ; 476 tmp.closing_wait = 30*HZ; 477 478 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) 479 return -EFAULT; 480 return 0; 481 } 482 483 static int qt2_ioctl(struct tty_struct *tty, 484 unsigned int cmd, unsigned long arg) 485 { 486 struct usb_serial_port *port = tty->driver_data; 487 488 switch (cmd) { 489 case TIOCGSERIAL: 490 return get_serial_info(port, 491 (struct serial_struct __user *)arg); 492 default: 493 break; 494 } 495 496 return -ENOIOCTLCMD; 497 } 498 499 static void qt2_process_status(struct usb_serial_port *port, unsigned char *ch) 500 { 501 switch (*ch) { 502 case QT2_LINE_STATUS: 503 qt2_update_lsr(port, ch + 1); 504 break; 505 case QT2_MODEM_STATUS: 506 qt2_update_msr(port, ch + 1); 507 break; 508 } 509 } 510 511 /* not needed, kept to document functionality */ 512 static void qt2_process_xmit_empty(struct usb_serial_port *port, 513 unsigned char *ch) 514 { 515 int bytes_written; 516 517 bytes_written = (int)(*ch) + (int)(*(ch + 1) << 4); 518 } 519 520 /* not needed, kept to document functionality */ 521 static void qt2_process_flush(struct usb_serial_port *port, unsigned char *ch) 522 { 523 return; 524 } 525 526 static void qt2_process_read_urb(struct urb *urb) 527 { 528 struct usb_serial *serial; 529 struct qt2_serial_private *serial_priv; 530 struct usb_serial_port *port; 531 struct qt2_port_private *port_priv; 532 bool escapeflag; 533 unsigned char *ch; 534 int i; 535 unsigned char newport; 536 int len = urb->actual_length; 537 538 if (!len) 539 return; 540 541 ch = urb->transfer_buffer; 542 serial = urb->context; 543 serial_priv = usb_get_serial_data(serial); 544 port = serial->port[serial_priv->current_port]; 545 port_priv = usb_get_serial_port_data(port); 546 547 for (i = 0; i < urb->actual_length; i++) { 548 ch = (unsigned char *)urb->transfer_buffer + i; 549 if ((i <= (len - 3)) && 550 (*ch == QT2_CONTROL_BYTE) && 551 (*(ch + 1) == QT2_CONTROL_BYTE)) { 552 escapeflag = false; 553 switch (*(ch + 2)) { 554 case QT2_LINE_STATUS: 555 case QT2_MODEM_STATUS: 556 if (i > (len - 4)) { 557 dev_warn(&port->dev, 558 "%s - status message too short\n", 559 __func__); 560 break; 561 } 562 qt2_process_status(port, ch + 2); 563 i += 3; 564 escapeflag = true; 565 break; 566 case QT2_XMIT_HOLD: 567 if (i > (len - 5)) { 568 dev_warn(&port->dev, 569 "%s - xmit_empty message too short\n", 570 __func__); 571 break; 572 } 573 qt2_process_xmit_empty(port, ch + 3); 574 i += 4; 575 escapeflag = true; 576 break; 577 case QT2_CHANGE_PORT: 578 if (i > (len - 4)) { 579 dev_warn(&port->dev, 580 "%s - change_port message too short\n", 581 __func__); 582 break; 583 } 584 tty_flip_buffer_push(&port->port); 585 586 newport = *(ch + 3); 587 588 if (newport > serial->num_ports) { 589 dev_err(&port->dev, 590 "%s - port change to invalid port: %i\n", 591 __func__, newport); 592 break; 593 } 594 595 serial_priv->current_port = newport; 596 port = serial->port[serial_priv->current_port]; 597 port_priv = usb_get_serial_port_data(port); 598 i += 3; 599 escapeflag = true; 600 break; 601 case QT2_REC_FLUSH: 602 case QT2_XMIT_FLUSH: 603 qt2_process_flush(port, ch + 2); 604 i += 2; 605 escapeflag = true; 606 break; 607 case QT2_CONTROL_ESCAPE: 608 tty_buffer_request_room(&port->port, 2); 609 tty_insert_flip_string(&port->port, ch, 2); 610 i += 2; 611 escapeflag = true; 612 break; 613 default: 614 dev_warn(&port->dev, 615 "%s - unsupported command %i\n", 616 __func__, *(ch + 2)); 617 break; 618 } 619 if (escapeflag) 620 continue; 621 } 622 623 tty_buffer_request_room(&port->port, 1); 624 tty_insert_flip_string(&port->port, ch, 1); 625 } 626 627 tty_flip_buffer_push(&port->port); 628 } 629 630 static void qt2_write_bulk_callback(struct urb *urb) 631 { 632 struct usb_serial_port *port; 633 struct qt2_port_private *port_priv; 634 635 port = urb->context; 636 port_priv = usb_get_serial_port_data(port); 637 638 spin_lock(&port_priv->urb_lock); 639 640 port_priv->urb_in_use = false; 641 usb_serial_port_softint(port); 642 643 spin_unlock(&port_priv->urb_lock); 644 645 } 646 647 static void qt2_read_bulk_callback(struct urb *urb) 648 { 649 struct usb_serial *serial = urb->context; 650 int status; 651 652 if (urb->status) { 653 dev_warn(&serial->dev->dev, 654 "%s - non-zero urb status: %i\n", __func__, 655 urb->status); 656 return; 657 } 658 659 qt2_process_read_urb(urb); 660 661 status = usb_submit_urb(urb, GFP_ATOMIC); 662 if (status != 0) 663 dev_err(&serial->dev->dev, 664 "%s - resubmit read urb failed: %i\n", 665 __func__, status); 666 } 667 668 static int qt2_setup_urbs(struct usb_serial *serial) 669 { 670 struct usb_serial_port *port0; 671 struct qt2_serial_private *serial_priv; 672 int status; 673 674 port0 = serial->port[0]; 675 676 serial_priv = usb_get_serial_data(serial); 677 serial_priv->read_urb = usb_alloc_urb(0, GFP_KERNEL); 678 if (!serial_priv->read_urb) 679 return -ENOMEM; 680 681 usb_fill_bulk_urb(serial_priv->read_urb, serial->dev, 682 usb_rcvbulkpipe(serial->dev, 683 port0->bulk_in_endpointAddress), 684 serial_priv->read_buffer, 685 QT2_READ_BUFFER_SIZE, 686 qt2_read_bulk_callback, serial); 687 688 status = usb_submit_urb(serial_priv->read_urb, GFP_KERNEL); 689 if (status != 0) { 690 dev_err(&serial->dev->dev, 691 "%s - submit read urb failed %i\n", __func__, status); 692 usb_free_urb(serial_priv->read_urb); 693 return status; 694 } 695 696 return 0; 697 } 698 699 static int qt2_attach(struct usb_serial *serial) 700 { 701 struct qt2_serial_private *serial_priv; 702 int status; 703 704 /* power on unit */ 705 status = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 706 0xc2, 0x40, 0x8000, 0, NULL, 0, 707 QT2_USB_TIMEOUT); 708 if (status < 0) { 709 dev_err(&serial->dev->dev, 710 "%s - failed to power on unit: %i\n", __func__, status); 711 return status; 712 } 713 714 serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL); 715 if (!serial_priv) 716 return -ENOMEM; 717 718 serial_priv->read_buffer = kmalloc(QT2_READ_BUFFER_SIZE, GFP_KERNEL); 719 if (!serial_priv->read_buffer) { 720 status = -ENOMEM; 721 goto err_buf; 722 } 723 724 usb_set_serial_data(serial, serial_priv); 725 726 status = qt2_setup_urbs(serial); 727 if (status != 0) 728 goto attach_failed; 729 730 return 0; 731 732 attach_failed: 733 kfree(serial_priv->read_buffer); 734 err_buf: 735 kfree(serial_priv); 736 return status; 737 } 738 739 static int qt2_port_probe(struct usb_serial_port *port) 740 { 741 struct usb_serial *serial = port->serial; 742 struct qt2_port_private *port_priv; 743 u8 bEndpointAddress; 744 745 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL); 746 if (!port_priv) 747 return -ENOMEM; 748 749 spin_lock_init(&port_priv->lock); 750 spin_lock_init(&port_priv->urb_lock); 751 port_priv->port = port; 752 753 port_priv->write_buffer = kmalloc(QT2_WRITE_BUFFER_SIZE, GFP_KERNEL); 754 if (!port_priv->write_buffer) 755 goto err_buf; 756 757 port_priv->write_urb = usb_alloc_urb(0, GFP_KERNEL); 758 if (!port_priv->write_urb) 759 goto err_urb; 760 761 bEndpointAddress = serial->port[0]->bulk_out_endpointAddress; 762 usb_fill_bulk_urb(port_priv->write_urb, serial->dev, 763 usb_sndbulkpipe(serial->dev, bEndpointAddress), 764 port_priv->write_buffer, 765 QT2_WRITE_BUFFER_SIZE, 766 qt2_write_bulk_callback, port); 767 768 usb_set_serial_port_data(port, port_priv); 769 770 return 0; 771 err_urb: 772 kfree(port_priv->write_buffer); 773 err_buf: 774 kfree(port_priv); 775 return -ENOMEM; 776 } 777 778 static int qt2_port_remove(struct usb_serial_port *port) 779 { 780 struct qt2_port_private *port_priv; 781 782 port_priv = usb_get_serial_port_data(port); 783 usb_free_urb(port_priv->write_urb); 784 kfree(port_priv->write_buffer); 785 kfree(port_priv); 786 787 return 0; 788 } 789 790 static int qt2_tiocmget(struct tty_struct *tty) 791 { 792 struct usb_serial_port *port = tty->driver_data; 793 struct usb_device *dev = port->serial->dev; 794 struct qt2_port_private *port_priv = usb_get_serial_port_data(port); 795 u8 *d; 796 int r; 797 798 d = kzalloc(2, GFP_KERNEL); 799 if (!d) 800 return -ENOMEM; 801 802 r = qt2_getregister(dev, port_priv->device_port, UART_MCR, d); 803 if (r < 0) 804 goto mget_out; 805 806 r = qt2_getregister(dev, port_priv->device_port, UART_MSR, d + 1); 807 if (r < 0) 808 goto mget_out; 809 810 r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) | 811 (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) | 812 (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) | 813 (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) | 814 (d[1] & UART_MSR_RI ? TIOCM_RI : 0) | 815 (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0); 816 817 mget_out: 818 kfree(d); 819 return r; 820 } 821 822 static int qt2_tiocmset(struct tty_struct *tty, 823 unsigned int set, unsigned int clear) 824 { 825 struct qt2_port_private *port_priv; 826 827 port_priv = usb_get_serial_port_data(tty->driver_data); 828 return update_mctrl(port_priv, set, clear); 829 } 830 831 static void qt2_break_ctl(struct tty_struct *tty, int break_state) 832 { 833 struct usb_serial_port *port = tty->driver_data; 834 struct qt2_port_private *port_priv; 835 int status; 836 u16 val; 837 838 port_priv = usb_get_serial_port_data(port); 839 840 val = (break_state == -1) ? 1 : 0; 841 842 status = qt2_control_msg(port->serial->dev, QT2_BREAK_CONTROL, 843 val, port_priv->device_port); 844 if (status < 0) 845 dev_warn(&port->dev, 846 "%s - failed to send control message: %i\n", __func__, 847 status); 848 } 849 850 851 852 static void qt2_dtr_rts(struct usb_serial_port *port, int on) 853 { 854 struct usb_device *dev = port->serial->dev; 855 struct qt2_port_private *port_priv = usb_get_serial_port_data(port); 856 857 /* Disable flow control */ 858 if (!on) { 859 if (qt2_setregister(dev, port_priv->device_port, 860 UART_MCR, 0) < 0) 861 dev_warn(&port->dev, "error from flowcontrol urb\n"); 862 } 863 /* drop RTS and DTR */ 864 if (on) 865 update_mctrl(port_priv, TIOCM_DTR | TIOCM_RTS, 0); 866 else 867 update_mctrl(port_priv, 0, TIOCM_DTR | TIOCM_RTS); 868 } 869 870 static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch) 871 { 872 struct qt2_port_private *port_priv; 873 u8 newMSR = (u8) *ch; 874 unsigned long flags; 875 876 port_priv = usb_get_serial_port_data(port); 877 878 spin_lock_irqsave(&port_priv->lock, flags); 879 port_priv->shadowMSR = newMSR; 880 spin_unlock_irqrestore(&port_priv->lock, flags); 881 882 if (newMSR & UART_MSR_ANY_DELTA) { 883 /* update input line counters */ 884 if (newMSR & UART_MSR_DCTS) 885 port->icount.cts++; 886 if (newMSR & UART_MSR_DDSR) 887 port->icount.dsr++; 888 if (newMSR & UART_MSR_DDCD) 889 port->icount.dcd++; 890 if (newMSR & UART_MSR_TERI) 891 port->icount.rng++; 892 893 wake_up_interruptible(&port->port.delta_msr_wait); 894 } 895 } 896 897 static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch) 898 { 899 struct qt2_port_private *port_priv; 900 struct async_icount *icount; 901 unsigned long flags; 902 u8 newLSR = (u8) *ch; 903 904 port_priv = usb_get_serial_port_data(port); 905 906 if (newLSR & UART_LSR_BI) 907 newLSR &= (u8) (UART_LSR_OE | UART_LSR_BI); 908 909 spin_lock_irqsave(&port_priv->lock, flags); 910 port_priv->shadowLSR = newLSR; 911 spin_unlock_irqrestore(&port_priv->lock, flags); 912 913 icount = &port->icount; 914 915 if (newLSR & UART_LSR_BRK_ERROR_BITS) { 916 917 if (newLSR & UART_LSR_BI) 918 icount->brk++; 919 920 if (newLSR & UART_LSR_OE) 921 icount->overrun++; 922 923 if (newLSR & UART_LSR_PE) 924 icount->parity++; 925 926 if (newLSR & UART_LSR_FE) 927 icount->frame++; 928 } 929 930 } 931 932 static int qt2_write_room(struct tty_struct *tty) 933 { 934 struct usb_serial_port *port = tty->driver_data; 935 struct qt2_port_private *port_priv; 936 unsigned long flags = 0; 937 int r; 938 939 port_priv = usb_get_serial_port_data(port); 940 941 spin_lock_irqsave(&port_priv->urb_lock, flags); 942 943 if (port_priv->urb_in_use) 944 r = 0; 945 else 946 r = QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE; 947 948 spin_unlock_irqrestore(&port_priv->urb_lock, flags); 949 950 return r; 951 } 952 953 static int qt2_write(struct tty_struct *tty, 954 struct usb_serial_port *port, 955 const unsigned char *buf, int count) 956 { 957 struct qt2_port_private *port_priv; 958 struct urb *write_urb; 959 unsigned char *data; 960 unsigned long flags; 961 int status; 962 int bytes_out = 0; 963 964 port_priv = usb_get_serial_port_data(port); 965 966 if (port_priv->write_urb == NULL) { 967 dev_err(&port->dev, "%s - no output urb\n", __func__); 968 return 0; 969 } 970 write_urb = port_priv->write_urb; 971 972 count = min(count, QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE); 973 974 data = write_urb->transfer_buffer; 975 spin_lock_irqsave(&port_priv->urb_lock, flags); 976 if (port_priv->urb_in_use) { 977 dev_err(&port->dev, "qt2_write - urb is in use\n"); 978 goto write_out; 979 } 980 981 *data++ = QT2_CONTROL_BYTE; 982 *data++ = QT2_CONTROL_BYTE; 983 *data++ = port_priv->device_port; 984 put_unaligned_le16(count, data); 985 data += 2; 986 memcpy(data, buf, count); 987 988 write_urb->transfer_buffer_length = count + QT2_WRITE_CONTROL_SIZE; 989 990 status = usb_submit_urb(write_urb, GFP_ATOMIC); 991 if (status == 0) { 992 port_priv->urb_in_use = true; 993 bytes_out += count; 994 } 995 996 write_out: 997 spin_unlock_irqrestore(&port_priv->urb_lock, flags); 998 return bytes_out; 999 } 1000 1001 1002 static struct usb_serial_driver qt2_device = { 1003 .driver = { 1004 .owner = THIS_MODULE, 1005 .name = "quatech-serial", 1006 }, 1007 .description = DRIVER_DESC, 1008 .id_table = id_table, 1009 .open = qt2_open, 1010 .close = qt2_close, 1011 .write = qt2_write, 1012 .write_room = qt2_write_room, 1013 .calc_num_ports = qt2_calc_num_ports, 1014 .attach = qt2_attach, 1015 .release = qt2_release, 1016 .disconnect = qt2_disconnect, 1017 .port_probe = qt2_port_probe, 1018 .port_remove = qt2_port_remove, 1019 .dtr_rts = qt2_dtr_rts, 1020 .break_ctl = qt2_break_ctl, 1021 .tiocmget = qt2_tiocmget, 1022 .tiocmset = qt2_tiocmset, 1023 .tiocmiwait = usb_serial_generic_tiocmiwait, 1024 .get_icount = usb_serial_generic_get_icount, 1025 .ioctl = qt2_ioctl, 1026 .set_termios = qt2_set_termios, 1027 }; 1028 1029 static struct usb_serial_driver *const serial_drivers[] = { 1030 &qt2_device, NULL 1031 }; 1032 1033 module_usb_serial_driver(serial_drivers, id_table); 1034 1035 MODULE_DESCRIPTION(DRIVER_DESC); 1036 MODULE_LICENSE("GPL"); 1037