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 int i; 412 413 serial = port->serial; 414 port_priv = usb_get_serial_port_data(port); 415 416 usb_kill_urb(port_priv->write_urb); 417 418 /* flush the port transmit buffer */ 419 i = usb_control_msg(serial->dev, 420 usb_rcvctrlpipe(serial->dev, 0), 421 QT2_FLUSH_DEVICE, 0x40, 1, 422 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT); 423 424 if (i < 0) 425 dev_err(&port->dev, "%s - transmit buffer flush failed: %i\n", 426 __func__, i); 427 428 /* flush the port receive buffer */ 429 i = usb_control_msg(serial->dev, 430 usb_rcvctrlpipe(serial->dev, 0), 431 QT2_FLUSH_DEVICE, 0x40, 0, 432 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT); 433 434 if (i < 0) 435 dev_err(&port->dev, "%s - receive buffer flush failed: %i\n", 436 __func__, i); 437 438 /* close the port */ 439 i = usb_control_msg(serial->dev, 440 usb_sndctrlpipe(serial->dev, 0), 441 QT_OPEN_CLOSE_CHANNEL, 442 0x40, 0, 443 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT); 444 445 if (i < 0) 446 dev_err(&port->dev, "%s - close port failed %i\n", 447 __func__, i); 448 } 449 450 static void qt2_disconnect(struct usb_serial *serial) 451 { 452 struct qt2_serial_private *serial_priv = usb_get_serial_data(serial); 453 454 usb_kill_urb(serial_priv->read_urb); 455 } 456 457 static int get_serial_info(struct usb_serial_port *port, 458 struct serial_struct __user *retinfo) 459 { 460 struct serial_struct tmp; 461 462 memset(&tmp, 0, sizeof(tmp)); 463 tmp.line = port->minor; 464 tmp.port = 0; 465 tmp.irq = 0; 466 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ; 467 tmp.xmit_fifo_size = port->bulk_out_size; 468 tmp.baud_base = 9600; 469 tmp.close_delay = 5*HZ; 470 tmp.closing_wait = 30*HZ; 471 472 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) 473 return -EFAULT; 474 return 0; 475 } 476 477 static int qt2_ioctl(struct tty_struct *tty, 478 unsigned int cmd, unsigned long arg) 479 { 480 struct usb_serial_port *port = tty->driver_data; 481 482 switch (cmd) { 483 case TIOCGSERIAL: 484 return get_serial_info(port, 485 (struct serial_struct __user *)arg); 486 default: 487 break; 488 } 489 490 return -ENOIOCTLCMD; 491 } 492 493 static void qt2_process_status(struct usb_serial_port *port, unsigned char *ch) 494 { 495 switch (*ch) { 496 case QT2_LINE_STATUS: 497 qt2_update_lsr(port, ch + 1); 498 break; 499 case QT2_MODEM_STATUS: 500 qt2_update_msr(port, ch + 1); 501 break; 502 } 503 } 504 505 /* not needed, kept to document functionality */ 506 static void qt2_process_xmit_empty(struct usb_serial_port *port, 507 unsigned char *ch) 508 { 509 int bytes_written; 510 511 bytes_written = (int)(*ch) + (int)(*(ch + 1) << 4); 512 } 513 514 /* not needed, kept to document functionality */ 515 static void qt2_process_flush(struct usb_serial_port *port, unsigned char *ch) 516 { 517 return; 518 } 519 520 static void qt2_process_read_urb(struct urb *urb) 521 { 522 struct usb_serial *serial; 523 struct qt2_serial_private *serial_priv; 524 struct usb_serial_port *port; 525 struct qt2_port_private *port_priv; 526 bool escapeflag; 527 unsigned char *ch; 528 int i; 529 unsigned char newport; 530 int len = urb->actual_length; 531 532 if (!len) 533 return; 534 535 ch = urb->transfer_buffer; 536 serial = urb->context; 537 serial_priv = usb_get_serial_data(serial); 538 port = serial->port[serial_priv->current_port]; 539 port_priv = usb_get_serial_port_data(port); 540 541 for (i = 0; i < urb->actual_length; i++) { 542 ch = (unsigned char *)urb->transfer_buffer + i; 543 if ((i <= (len - 3)) && 544 (*ch == QT2_CONTROL_BYTE) && 545 (*(ch + 1) == QT2_CONTROL_BYTE)) { 546 escapeflag = false; 547 switch (*(ch + 2)) { 548 case QT2_LINE_STATUS: 549 case QT2_MODEM_STATUS: 550 if (i > (len - 4)) { 551 dev_warn(&port->dev, 552 "%s - status message too short\n", 553 __func__); 554 break; 555 } 556 qt2_process_status(port, ch + 2); 557 i += 3; 558 escapeflag = true; 559 break; 560 case QT2_XMIT_HOLD: 561 if (i > (len - 5)) { 562 dev_warn(&port->dev, 563 "%s - xmit_empty message too short\n", 564 __func__); 565 break; 566 } 567 qt2_process_xmit_empty(port, ch + 3); 568 i += 4; 569 escapeflag = true; 570 break; 571 case QT2_CHANGE_PORT: 572 if (i > (len - 4)) { 573 dev_warn(&port->dev, 574 "%s - change_port message too short\n", 575 __func__); 576 break; 577 } 578 tty_flip_buffer_push(&port->port); 579 580 newport = *(ch + 3); 581 582 if (newport > serial->num_ports) { 583 dev_err(&port->dev, 584 "%s - port change to invalid port: %i\n", 585 __func__, newport); 586 break; 587 } 588 589 serial_priv->current_port = newport; 590 port = serial->port[serial_priv->current_port]; 591 port_priv = usb_get_serial_port_data(port); 592 i += 3; 593 escapeflag = true; 594 break; 595 case QT2_REC_FLUSH: 596 case QT2_XMIT_FLUSH: 597 qt2_process_flush(port, ch + 2); 598 i += 2; 599 escapeflag = true; 600 break; 601 case QT2_CONTROL_ESCAPE: 602 tty_buffer_request_room(&port->port, 2); 603 tty_insert_flip_string(&port->port, ch, 2); 604 i += 2; 605 escapeflag = true; 606 break; 607 default: 608 dev_warn(&port->dev, 609 "%s - unsupported command %i\n", 610 __func__, *(ch + 2)); 611 break; 612 } 613 if (escapeflag) 614 continue; 615 } 616 617 tty_buffer_request_room(&port->port, 1); 618 tty_insert_flip_string(&port->port, ch, 1); 619 } 620 621 tty_flip_buffer_push(&port->port); 622 } 623 624 static void qt2_write_bulk_callback(struct urb *urb) 625 { 626 struct usb_serial_port *port; 627 struct qt2_port_private *port_priv; 628 629 port = urb->context; 630 port_priv = usb_get_serial_port_data(port); 631 632 spin_lock(&port_priv->urb_lock); 633 634 port_priv->urb_in_use = false; 635 usb_serial_port_softint(port); 636 637 spin_unlock(&port_priv->urb_lock); 638 639 } 640 641 static void qt2_read_bulk_callback(struct urb *urb) 642 { 643 struct usb_serial *serial = urb->context; 644 int status; 645 646 if (urb->status) { 647 dev_warn(&serial->dev->dev, 648 "%s - non-zero urb status: %i\n", __func__, 649 urb->status); 650 return; 651 } 652 653 qt2_process_read_urb(urb); 654 655 status = usb_submit_urb(urb, GFP_ATOMIC); 656 if (status != 0) 657 dev_err(&serial->dev->dev, 658 "%s - resubmit read urb failed: %i\n", 659 __func__, status); 660 } 661 662 static int qt2_setup_urbs(struct usb_serial *serial) 663 { 664 struct usb_serial_port *port0; 665 struct qt2_serial_private *serial_priv; 666 int status; 667 668 port0 = serial->port[0]; 669 670 serial_priv = usb_get_serial_data(serial); 671 serial_priv->read_urb = usb_alloc_urb(0, GFP_KERNEL); 672 if (!serial_priv->read_urb) 673 return -ENOMEM; 674 675 usb_fill_bulk_urb(serial_priv->read_urb, serial->dev, 676 usb_rcvbulkpipe(serial->dev, 677 port0->bulk_in_endpointAddress), 678 serial_priv->read_buffer, 679 QT2_READ_BUFFER_SIZE, 680 qt2_read_bulk_callback, serial); 681 682 status = usb_submit_urb(serial_priv->read_urb, GFP_KERNEL); 683 if (status != 0) { 684 dev_err(&serial->dev->dev, 685 "%s - submit read urb failed %i\n", __func__, status); 686 usb_free_urb(serial_priv->read_urb); 687 return status; 688 } 689 690 return 0; 691 } 692 693 static int qt2_attach(struct usb_serial *serial) 694 { 695 struct qt2_serial_private *serial_priv; 696 int status; 697 698 /* power on unit */ 699 status = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 700 0xc2, 0x40, 0x8000, 0, NULL, 0, 701 QT2_USB_TIMEOUT); 702 if (status < 0) { 703 dev_err(&serial->dev->dev, 704 "%s - failed to power on unit: %i\n", __func__, status); 705 return status; 706 } 707 708 serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL); 709 if (!serial_priv) 710 return -ENOMEM; 711 712 serial_priv->read_buffer = kmalloc(QT2_READ_BUFFER_SIZE, GFP_KERNEL); 713 if (!serial_priv->read_buffer) { 714 status = -ENOMEM; 715 goto err_buf; 716 } 717 718 usb_set_serial_data(serial, serial_priv); 719 720 status = qt2_setup_urbs(serial); 721 if (status != 0) 722 goto attach_failed; 723 724 return 0; 725 726 attach_failed: 727 kfree(serial_priv->read_buffer); 728 err_buf: 729 kfree(serial_priv); 730 return status; 731 } 732 733 static int qt2_port_probe(struct usb_serial_port *port) 734 { 735 struct usb_serial *serial = port->serial; 736 struct qt2_port_private *port_priv; 737 u8 bEndpointAddress; 738 739 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL); 740 if (!port_priv) 741 return -ENOMEM; 742 743 spin_lock_init(&port_priv->lock); 744 spin_lock_init(&port_priv->urb_lock); 745 port_priv->port = port; 746 747 port_priv->write_buffer = kmalloc(QT2_WRITE_BUFFER_SIZE, GFP_KERNEL); 748 if (!port_priv->write_buffer) 749 goto err_buf; 750 751 port_priv->write_urb = usb_alloc_urb(0, GFP_KERNEL); 752 if (!port_priv->write_urb) 753 goto err_urb; 754 755 bEndpointAddress = serial->port[0]->bulk_out_endpointAddress; 756 usb_fill_bulk_urb(port_priv->write_urb, serial->dev, 757 usb_sndbulkpipe(serial->dev, bEndpointAddress), 758 port_priv->write_buffer, 759 QT2_WRITE_BUFFER_SIZE, 760 qt2_write_bulk_callback, port); 761 762 usb_set_serial_port_data(port, port_priv); 763 764 return 0; 765 err_urb: 766 kfree(port_priv->write_buffer); 767 err_buf: 768 kfree(port_priv); 769 return -ENOMEM; 770 } 771 772 static int qt2_port_remove(struct usb_serial_port *port) 773 { 774 struct qt2_port_private *port_priv; 775 776 port_priv = usb_get_serial_port_data(port); 777 usb_free_urb(port_priv->write_urb); 778 kfree(port_priv->write_buffer); 779 kfree(port_priv); 780 781 return 0; 782 } 783 784 static int qt2_tiocmget(struct tty_struct *tty) 785 { 786 struct usb_serial_port *port = tty->driver_data; 787 struct usb_device *dev = port->serial->dev; 788 struct qt2_port_private *port_priv = usb_get_serial_port_data(port); 789 u8 *d; 790 int r; 791 792 d = kzalloc(2, GFP_KERNEL); 793 if (!d) 794 return -ENOMEM; 795 796 r = qt2_getregister(dev, port_priv->device_port, UART_MCR, d); 797 if (r < 0) 798 goto mget_out; 799 800 r = qt2_getregister(dev, port_priv->device_port, UART_MSR, d + 1); 801 if (r < 0) 802 goto mget_out; 803 804 r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) | 805 (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) | 806 (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) | 807 (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) | 808 (d[1] & UART_MSR_RI ? TIOCM_RI : 0) | 809 (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0); 810 811 mget_out: 812 kfree(d); 813 return r; 814 } 815 816 static int qt2_tiocmset(struct tty_struct *tty, 817 unsigned int set, unsigned int clear) 818 { 819 struct qt2_port_private *port_priv; 820 821 port_priv = usb_get_serial_port_data(tty->driver_data); 822 return update_mctrl(port_priv, set, clear); 823 } 824 825 static void qt2_break_ctl(struct tty_struct *tty, int break_state) 826 { 827 struct usb_serial_port *port = tty->driver_data; 828 struct qt2_port_private *port_priv; 829 int status; 830 u16 val; 831 832 port_priv = usb_get_serial_port_data(port); 833 834 val = (break_state == -1) ? 1 : 0; 835 836 status = qt2_control_msg(port->serial->dev, QT2_BREAK_CONTROL, 837 val, port_priv->device_port); 838 if (status < 0) 839 dev_warn(&port->dev, 840 "%s - failed to send control message: %i\n", __func__, 841 status); 842 } 843 844 845 846 static void qt2_dtr_rts(struct usb_serial_port *port, int on) 847 { 848 struct usb_device *dev = port->serial->dev; 849 struct qt2_port_private *port_priv = usb_get_serial_port_data(port); 850 851 /* Disable flow control */ 852 if (!on) { 853 if (qt2_setregister(dev, port_priv->device_port, 854 UART_MCR, 0) < 0) 855 dev_warn(&port->dev, "error from flowcontrol urb\n"); 856 } 857 /* drop RTS and DTR */ 858 if (on) 859 update_mctrl(port_priv, TIOCM_DTR | TIOCM_RTS, 0); 860 else 861 update_mctrl(port_priv, 0, TIOCM_DTR | TIOCM_RTS); 862 } 863 864 static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch) 865 { 866 struct qt2_port_private *port_priv; 867 u8 newMSR = (u8) *ch; 868 unsigned long flags; 869 870 port_priv = usb_get_serial_port_data(port); 871 872 spin_lock_irqsave(&port_priv->lock, flags); 873 port_priv->shadowMSR = newMSR; 874 spin_unlock_irqrestore(&port_priv->lock, flags); 875 876 if (newMSR & UART_MSR_ANY_DELTA) { 877 /* update input line counters */ 878 if (newMSR & UART_MSR_DCTS) 879 port->icount.cts++; 880 if (newMSR & UART_MSR_DDSR) 881 port->icount.dsr++; 882 if (newMSR & UART_MSR_DDCD) 883 port->icount.dcd++; 884 if (newMSR & UART_MSR_TERI) 885 port->icount.rng++; 886 887 wake_up_interruptible(&port->port.delta_msr_wait); 888 } 889 } 890 891 static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch) 892 { 893 struct qt2_port_private *port_priv; 894 struct async_icount *icount; 895 unsigned long flags; 896 u8 newLSR = (u8) *ch; 897 898 port_priv = usb_get_serial_port_data(port); 899 900 if (newLSR & UART_LSR_BI) 901 newLSR &= (u8) (UART_LSR_OE | UART_LSR_BI); 902 903 spin_lock_irqsave(&port_priv->lock, flags); 904 port_priv->shadowLSR = newLSR; 905 spin_unlock_irqrestore(&port_priv->lock, flags); 906 907 icount = &port->icount; 908 909 if (newLSR & UART_LSR_BRK_ERROR_BITS) { 910 911 if (newLSR & UART_LSR_BI) 912 icount->brk++; 913 914 if (newLSR & UART_LSR_OE) 915 icount->overrun++; 916 917 if (newLSR & UART_LSR_PE) 918 icount->parity++; 919 920 if (newLSR & UART_LSR_FE) 921 icount->frame++; 922 } 923 924 } 925 926 static int qt2_write_room(struct tty_struct *tty) 927 { 928 struct usb_serial_port *port = tty->driver_data; 929 struct qt2_port_private *port_priv; 930 unsigned long flags = 0; 931 int r; 932 933 port_priv = usb_get_serial_port_data(port); 934 935 spin_lock_irqsave(&port_priv->urb_lock, flags); 936 937 if (port_priv->urb_in_use) 938 r = 0; 939 else 940 r = QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE; 941 942 spin_unlock_irqrestore(&port_priv->urb_lock, flags); 943 944 return r; 945 } 946 947 static int qt2_write(struct tty_struct *tty, 948 struct usb_serial_port *port, 949 const unsigned char *buf, int count) 950 { 951 struct qt2_port_private *port_priv; 952 struct urb *write_urb; 953 unsigned char *data; 954 unsigned long flags; 955 int status; 956 int bytes_out = 0; 957 958 port_priv = usb_get_serial_port_data(port); 959 960 if (port_priv->write_urb == NULL) { 961 dev_err(&port->dev, "%s - no output urb\n", __func__); 962 return 0; 963 } 964 write_urb = port_priv->write_urb; 965 966 count = min(count, QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE); 967 968 data = write_urb->transfer_buffer; 969 spin_lock_irqsave(&port_priv->urb_lock, flags); 970 if (port_priv->urb_in_use) { 971 dev_err(&port->dev, "qt2_write - urb is in use\n"); 972 goto write_out; 973 } 974 975 *data++ = QT2_CONTROL_BYTE; 976 *data++ = QT2_CONTROL_BYTE; 977 *data++ = port_priv->device_port; 978 put_unaligned_le16(count, data); 979 data += 2; 980 memcpy(data, buf, count); 981 982 write_urb->transfer_buffer_length = count + QT2_WRITE_CONTROL_SIZE; 983 984 status = usb_submit_urb(write_urb, GFP_ATOMIC); 985 if (status == 0) { 986 port_priv->urb_in_use = true; 987 bytes_out += count; 988 } 989 990 write_out: 991 spin_unlock_irqrestore(&port_priv->urb_lock, flags); 992 return bytes_out; 993 } 994 995 996 static struct usb_serial_driver qt2_device = { 997 .driver = { 998 .owner = THIS_MODULE, 999 .name = "quatech-serial", 1000 }, 1001 .description = DRIVER_DESC, 1002 .id_table = id_table, 1003 .open = qt2_open, 1004 .close = qt2_close, 1005 .write = qt2_write, 1006 .write_room = qt2_write_room, 1007 .calc_num_ports = qt2_calc_num_ports, 1008 .attach = qt2_attach, 1009 .release = qt2_release, 1010 .disconnect = qt2_disconnect, 1011 .port_probe = qt2_port_probe, 1012 .port_remove = qt2_port_remove, 1013 .dtr_rts = qt2_dtr_rts, 1014 .break_ctl = qt2_break_ctl, 1015 .tiocmget = qt2_tiocmget, 1016 .tiocmset = qt2_tiocmset, 1017 .tiocmiwait = usb_serial_generic_tiocmiwait, 1018 .get_icount = usb_serial_generic_get_icount, 1019 .ioctl = qt2_ioctl, 1020 .set_termios = qt2_set_termios, 1021 }; 1022 1023 static struct usb_serial_driver *const serial_drivers[] = { 1024 &qt2_device, NULL 1025 }; 1026 1027 module_usb_serial_driver(serial_drivers, id_table); 1028 1029 MODULE_DESCRIPTION(DRIVER_DESC); 1030 MODULE_LICENSE("GPL"); 1031