1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * usb-serial driver for Quatech USB 2 devices 4 * 5 * Copyright (C) 2012 Bill Pemberton (wfp5p@virginia.edu) 6 * 7 * These devices all have only 1 bulk in and 1 bulk out that is shared 8 * for all serial ports. 9 * 10 */ 11 12 #include <asm/unaligned.h> 13 #include <linux/errno.h> 14 #include <linux/slab.h> 15 #include <linux/tty.h> 16 #include <linux/tty_driver.h> 17 #include <linux/tty_flip.h> 18 #include <linux/module.h> 19 #include <linux/serial.h> 20 #include <linux/usb.h> 21 #include <linux/usb/serial.h> 22 #include <linux/serial_reg.h> 23 #include <linux/uaccess.h> 24 25 /* default urb timeout for usb operations */ 26 #define QT2_USB_TIMEOUT USB_CTRL_SET_TIMEOUT 27 28 #define QT_OPEN_CLOSE_CHANNEL 0xca 29 #define QT_SET_GET_DEVICE 0xc2 30 #define QT_SET_GET_REGISTER 0xc0 31 #define QT_GET_SET_PREBUF_TRIG_LVL 0xcc 32 #define QT_SET_ATF 0xcd 33 #define QT_TRANSFER_IN 0xc0 34 #define QT_HW_FLOW_CONTROL_MASK 0xc5 35 #define QT_SW_FLOW_CONTROL_MASK 0xc6 36 #define QT2_BREAK_CONTROL 0xc8 37 #define QT2_GET_SET_UART 0xc1 38 #define QT2_FLUSH_DEVICE 0xc4 39 #define QT2_GET_SET_QMCR 0xe1 40 #define QT2_QMCR_RS232 0x40 41 #define QT2_QMCR_RS422 0x10 42 43 #define SERIAL_CRTSCTS ((UART_MCR_RTS << 8) | UART_MSR_CTS) 44 45 #define SERIAL_EVEN_PARITY (UART_LCR_PARITY | UART_LCR_EPAR) 46 47 /* status bytes for the device */ 48 #define QT2_CONTROL_BYTE 0x1b 49 #define QT2_LINE_STATUS 0x00 /* following 1 byte is line status */ 50 #define QT2_MODEM_STATUS 0x01 /* following 1 byte is modem status */ 51 #define QT2_XMIT_HOLD 0x02 /* following 2 bytes are ?? */ 52 #define QT2_CHANGE_PORT 0x03 /* following 1 byte is port to change to */ 53 #define QT2_REC_FLUSH 0x04 /* no following info */ 54 #define QT2_XMIT_FLUSH 0x05 /* no following info */ 55 #define QT2_CONTROL_ESCAPE 0xff /* pass through previous 2 control bytes */ 56 57 #define MAX_BAUD_RATE 921600 58 #define DEFAULT_BAUD_RATE 9600 59 60 #define QT2_READ_BUFFER_SIZE 512 /* size of read buffer */ 61 #define QT2_WRITE_BUFFER_SIZE 512 /* size of write buffer */ 62 #define QT2_WRITE_CONTROL_SIZE 5 /* control bytes used for a write */ 63 64 #define DRIVER_DESC "Quatech 2nd gen USB to Serial Driver" 65 66 #define USB_VENDOR_ID_QUATECH 0x061d 67 #define QUATECH_SSU2_100 0xC120 /* RS232 single port */ 68 #define QUATECH_DSU2_100 0xC140 /* RS232 dual port */ 69 #define QUATECH_DSU2_400 0xC150 /* RS232/422/485 dual port */ 70 #define QUATECH_QSU2_100 0xC160 /* RS232 four port */ 71 #define QUATECH_QSU2_400 0xC170 /* RS232/422/485 four port */ 72 #define QUATECH_ESU2_100 0xC1A0 /* RS232 eight port */ 73 #define QUATECH_ESU2_400 0xC180 /* RS232/422/485 eight port */ 74 75 struct qt2_device_detail { 76 int product_id; 77 int num_ports; 78 }; 79 80 #define QT_DETAILS(prod, ports) \ 81 .product_id = (prod), \ 82 .num_ports = (ports) 83 84 static const struct qt2_device_detail qt2_device_details[] = { 85 {QT_DETAILS(QUATECH_SSU2_100, 1)}, 86 {QT_DETAILS(QUATECH_DSU2_400, 2)}, 87 {QT_DETAILS(QUATECH_DSU2_100, 2)}, 88 {QT_DETAILS(QUATECH_QSU2_400, 4)}, 89 {QT_DETAILS(QUATECH_QSU2_100, 4)}, 90 {QT_DETAILS(QUATECH_ESU2_400, 8)}, 91 {QT_DETAILS(QUATECH_ESU2_100, 8)}, 92 {QT_DETAILS(0, 0)} /* Terminating entry */ 93 }; 94 95 static const struct usb_device_id id_table[] = { 96 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_SSU2_100)}, 97 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU2_100)}, 98 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU2_400)}, 99 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU2_100)}, 100 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU2_400)}, 101 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU2_100)}, 102 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU2_400)}, 103 {} /* Terminating entry */ 104 }; 105 MODULE_DEVICE_TABLE(usb, id_table); 106 107 struct qt2_serial_private { 108 unsigned char current_port; /* current port for incoming data */ 109 110 struct urb *read_urb; /* shared among all ports */ 111 char *read_buffer; 112 }; 113 114 struct qt2_port_private { 115 u8 device_port; 116 117 spinlock_t urb_lock; 118 bool urb_in_use; 119 struct urb *write_urb; 120 char *write_buffer; 121 122 spinlock_t lock; 123 u8 shadowLSR; 124 u8 shadowMSR; 125 126 struct usb_serial_port *port; 127 }; 128 129 static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch); 130 static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch); 131 static void qt2_write_bulk_callback(struct urb *urb); 132 static void qt2_read_bulk_callback(struct urb *urb); 133 134 static void qt2_release(struct usb_serial *serial) 135 { 136 struct qt2_serial_private *serial_priv; 137 138 serial_priv = usb_get_serial_data(serial); 139 140 usb_kill_urb(serial_priv->read_urb); 141 usb_free_urb(serial_priv->read_urb); 142 kfree(serial_priv->read_buffer); 143 kfree(serial_priv); 144 } 145 146 static inline int calc_baud_divisor(int baudrate) 147 { 148 int divisor, rem; 149 150 divisor = MAX_BAUD_RATE / baudrate; 151 rem = MAX_BAUD_RATE % baudrate; 152 /* Round to nearest divisor */ 153 if (((rem * 2) >= baudrate) && (baudrate != 110)) 154 divisor++; 155 156 return divisor; 157 } 158 159 static inline int qt2_set_port_config(struct usb_device *dev, 160 unsigned char port_number, 161 u16 baudrate, u16 lcr) 162 { 163 int divisor = calc_baud_divisor(baudrate); 164 u16 index = ((u16) (lcr << 8) | (u16) (port_number)); 165 166 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), 167 QT2_GET_SET_UART, 0x40, 168 divisor, index, NULL, 0, QT2_USB_TIMEOUT); 169 } 170 171 static inline int qt2_control_msg(struct usb_device *dev, 172 u8 request, u16 data, u16 index) 173 { 174 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), 175 request, 0x40, data, index, 176 NULL, 0, QT2_USB_TIMEOUT); 177 } 178 179 static inline int qt2_setdevice(struct usb_device *dev, u8 *data) 180 { 181 u16 x = ((u16) (data[1] << 8) | (u16) (data[0])); 182 183 return qt2_control_msg(dev, QT_SET_GET_DEVICE, x, 0); 184 } 185 186 187 static inline int qt2_getregister(struct usb_device *dev, 188 u8 uart, 189 u8 reg, 190 u8 *data) 191 { 192 int ret; 193 194 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), 195 QT_SET_GET_REGISTER, 0xc0, reg, 196 uart, data, sizeof(*data), QT2_USB_TIMEOUT); 197 if (ret < (int)sizeof(*data)) { 198 if (ret >= 0) 199 ret = -EIO; 200 } 201 202 return ret; 203 } 204 205 static inline int qt2_setregister(struct usb_device *dev, 206 u8 uart, u8 reg, u16 data) 207 { 208 u16 value = (data << 8) | reg; 209 210 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), 211 QT_SET_GET_REGISTER, 0x40, value, uart, 212 NULL, 0, QT2_USB_TIMEOUT); 213 } 214 215 static inline int update_mctrl(struct qt2_port_private *port_priv, 216 unsigned int set, unsigned int clear) 217 { 218 struct usb_serial_port *port = port_priv->port; 219 struct usb_device *dev = port->serial->dev; 220 unsigned urb_value; 221 int status; 222 223 if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0) { 224 dev_dbg(&port->dev, 225 "update_mctrl - DTR|RTS not being set|cleared\n"); 226 return 0; /* no change */ 227 } 228 229 clear &= ~set; /* 'set' takes precedence over 'clear' */ 230 urb_value = 0; 231 if (set & TIOCM_DTR) 232 urb_value |= UART_MCR_DTR; 233 if (set & TIOCM_RTS) 234 urb_value |= UART_MCR_RTS; 235 236 status = qt2_setregister(dev, port_priv->device_port, UART_MCR, 237 urb_value); 238 if (status < 0) 239 dev_err(&port->dev, 240 "update_mctrl - Error from MODEM_CTRL urb: %i\n", 241 status); 242 return status; 243 } 244 245 static int qt2_calc_num_ports(struct usb_serial *serial, 246 struct usb_serial_endpoints *epds) 247 { 248 struct qt2_device_detail d; 249 int i; 250 251 for (i = 0; d = qt2_device_details[i], d.product_id != 0; i++) { 252 if (d.product_id == le16_to_cpu(serial->dev->descriptor.idProduct)) 253 return d.num_ports; 254 } 255 256 /* we didn't recognize the device */ 257 dev_err(&serial->dev->dev, 258 "don't know the number of ports, assuming 1\n"); 259 260 return 1; 261 } 262 263 static void qt2_set_termios(struct tty_struct *tty, 264 struct usb_serial_port *port, 265 struct ktermios *old_termios) 266 { 267 struct usb_device *dev = port->serial->dev; 268 struct qt2_port_private *port_priv; 269 struct ktermios *termios = &tty->termios; 270 u16 baud; 271 unsigned int cflag = termios->c_cflag; 272 u16 new_lcr = 0; 273 int status; 274 275 port_priv = usb_get_serial_port_data(port); 276 277 if (cflag & PARENB) { 278 if (cflag & PARODD) 279 new_lcr |= UART_LCR_PARITY; 280 else 281 new_lcr |= SERIAL_EVEN_PARITY; 282 } 283 284 switch (cflag & CSIZE) { 285 case CS5: 286 new_lcr |= UART_LCR_WLEN5; 287 break; 288 case CS6: 289 new_lcr |= UART_LCR_WLEN6; 290 break; 291 case CS7: 292 new_lcr |= UART_LCR_WLEN7; 293 break; 294 default: 295 case CS8: 296 new_lcr |= UART_LCR_WLEN8; 297 break; 298 } 299 300 baud = tty_get_baud_rate(tty); 301 if (!baud) 302 baud = 9600; 303 304 status = qt2_set_port_config(dev, port_priv->device_port, baud, 305 new_lcr); 306 if (status < 0) 307 dev_err(&port->dev, "%s - qt2_set_port_config failed: %i\n", 308 __func__, status); 309 310 if (cflag & CRTSCTS) 311 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK, 312 SERIAL_CRTSCTS, 313 port_priv->device_port); 314 else 315 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK, 316 0, port_priv->device_port); 317 if (status < 0) 318 dev_err(&port->dev, "%s - set HW flow control failed: %i\n", 319 __func__, status); 320 321 if (I_IXOFF(tty) || I_IXON(tty)) { 322 u16 x = ((u16) (START_CHAR(tty) << 8) | (u16) (STOP_CHAR(tty))); 323 324 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK, 325 x, port_priv->device_port); 326 } else 327 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK, 328 0, port_priv->device_port); 329 330 if (status < 0) 331 dev_err(&port->dev, "%s - set SW flow control failed: %i\n", 332 __func__, status); 333 334 } 335 336 static int qt2_open(struct tty_struct *tty, struct usb_serial_port *port) 337 { 338 struct usb_serial *serial; 339 struct qt2_port_private *port_priv; 340 u8 *data; 341 u16 device_port; 342 int status; 343 unsigned long flags; 344 345 device_port = port->port_number; 346 347 serial = port->serial; 348 349 port_priv = usb_get_serial_port_data(port); 350 351 /* set the port to RS232 mode */ 352 status = qt2_control_msg(serial->dev, QT2_GET_SET_QMCR, 353 QT2_QMCR_RS232, device_port); 354 if (status < 0) { 355 dev_err(&port->dev, 356 "%s failed to set RS232 mode for port %i error %i\n", 357 __func__, device_port, status); 358 return status; 359 } 360 361 data = kzalloc(2, GFP_KERNEL); 362 if (!data) 363 return -ENOMEM; 364 365 /* open the port */ 366 status = usb_control_msg(serial->dev, 367 usb_rcvctrlpipe(serial->dev, 0), 368 QT_OPEN_CLOSE_CHANNEL, 369 0xc0, 0, 370 device_port, data, 2, QT2_USB_TIMEOUT); 371 372 if (status < 2) { 373 dev_err(&port->dev, "%s - open port failed %i\n", __func__, 374 status); 375 if (status >= 0) 376 status = -EIO; 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 int i; 411 412 serial = port->serial; 413 port_priv = usb_get_serial_port_data(port); 414 415 usb_kill_urb(port_priv->write_urb); 416 417 /* flush the port transmit buffer */ 418 i = usb_control_msg(serial->dev, 419 usb_rcvctrlpipe(serial->dev, 0), 420 QT2_FLUSH_DEVICE, 0x40, 1, 421 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT); 422 423 if (i < 0) 424 dev_err(&port->dev, "%s - transmit buffer flush failed: %i\n", 425 __func__, i); 426 427 /* flush the port receive buffer */ 428 i = usb_control_msg(serial->dev, 429 usb_rcvctrlpipe(serial->dev, 0), 430 QT2_FLUSH_DEVICE, 0x40, 0, 431 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT); 432 433 if (i < 0) 434 dev_err(&port->dev, "%s - receive buffer flush failed: %i\n", 435 __func__, i); 436 437 /* close the port */ 438 i = usb_control_msg(serial->dev, 439 usb_sndctrlpipe(serial->dev, 0), 440 QT_OPEN_CLOSE_CHANNEL, 441 0x40, 0, 442 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT); 443 444 if (i < 0) 445 dev_err(&port->dev, "%s - close port failed %i\n", 446 __func__, i); 447 } 448 449 static void qt2_disconnect(struct usb_serial *serial) 450 { 451 struct qt2_serial_private *serial_priv = usb_get_serial_data(serial); 452 453 usb_kill_urb(serial_priv->read_urb); 454 } 455 456 static int get_serial_info(struct usb_serial_port *port, 457 struct serial_struct __user *retinfo) 458 { 459 struct serial_struct tmp; 460 461 memset(&tmp, 0, sizeof(tmp)); 462 tmp.line = port->minor; 463 tmp.port = 0; 464 tmp.irq = 0; 465 tmp.xmit_fifo_size = port->bulk_out_size; 466 tmp.baud_base = 9600; 467 tmp.close_delay = 5*HZ; 468 tmp.closing_wait = 30*HZ; 469 470 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) 471 return -EFAULT; 472 return 0; 473 } 474 475 static int qt2_ioctl(struct tty_struct *tty, 476 unsigned int cmd, unsigned long arg) 477 { 478 struct usb_serial_port *port = tty->driver_data; 479 480 switch (cmd) { 481 case TIOCGSERIAL: 482 return get_serial_info(port, 483 (struct serial_struct __user *)arg); 484 default: 485 break; 486 } 487 488 return -ENOIOCTLCMD; 489 } 490 491 static void qt2_process_status(struct usb_serial_port *port, unsigned char *ch) 492 { 493 switch (*ch) { 494 case QT2_LINE_STATUS: 495 qt2_update_lsr(port, ch + 1); 496 break; 497 case QT2_MODEM_STATUS: 498 qt2_update_msr(port, ch + 1); 499 break; 500 } 501 } 502 503 /* not needed, kept to document functionality */ 504 static void qt2_process_xmit_empty(struct usb_serial_port *port, 505 unsigned char *ch) 506 { 507 int bytes_written; 508 509 bytes_written = (int)(*ch) + (int)(*(ch + 1) << 4); 510 } 511 512 /* not needed, kept to document functionality */ 513 static void qt2_process_flush(struct usb_serial_port *port, unsigned char *ch) 514 { 515 return; 516 } 517 518 static void qt2_process_read_urb(struct urb *urb) 519 { 520 struct usb_serial *serial; 521 struct qt2_serial_private *serial_priv; 522 struct usb_serial_port *port; 523 struct qt2_port_private *port_priv; 524 bool escapeflag; 525 unsigned char *ch; 526 int i; 527 unsigned char newport; 528 int len = urb->actual_length; 529 530 if (!len) 531 return; 532 533 ch = urb->transfer_buffer; 534 serial = urb->context; 535 serial_priv = usb_get_serial_data(serial); 536 port = serial->port[serial_priv->current_port]; 537 port_priv = usb_get_serial_port_data(port); 538 539 for (i = 0; i < urb->actual_length; i++) { 540 ch = (unsigned char *)urb->transfer_buffer + i; 541 if ((i <= (len - 3)) && 542 (*ch == QT2_CONTROL_BYTE) && 543 (*(ch + 1) == QT2_CONTROL_BYTE)) { 544 escapeflag = false; 545 switch (*(ch + 2)) { 546 case QT2_LINE_STATUS: 547 case QT2_MODEM_STATUS: 548 if (i > (len - 4)) { 549 dev_warn(&port->dev, 550 "%s - status message too short\n", 551 __func__); 552 break; 553 } 554 qt2_process_status(port, ch + 2); 555 i += 3; 556 escapeflag = true; 557 break; 558 case QT2_XMIT_HOLD: 559 if (i > (len - 5)) { 560 dev_warn(&port->dev, 561 "%s - xmit_empty message too short\n", 562 __func__); 563 break; 564 } 565 qt2_process_xmit_empty(port, ch + 3); 566 i += 4; 567 escapeflag = true; 568 break; 569 case QT2_CHANGE_PORT: 570 if (i > (len - 4)) { 571 dev_warn(&port->dev, 572 "%s - change_port message too short\n", 573 __func__); 574 break; 575 } 576 tty_flip_buffer_push(&port->port); 577 578 newport = *(ch + 3); 579 580 if (newport > serial->num_ports) { 581 dev_err(&port->dev, 582 "%s - port change to invalid port: %i\n", 583 __func__, newport); 584 break; 585 } 586 587 serial_priv->current_port = newport; 588 port = serial->port[serial_priv->current_port]; 589 port_priv = usb_get_serial_port_data(port); 590 i += 3; 591 escapeflag = true; 592 break; 593 case QT2_REC_FLUSH: 594 case QT2_XMIT_FLUSH: 595 qt2_process_flush(port, ch + 2); 596 i += 2; 597 escapeflag = true; 598 break; 599 case QT2_CONTROL_ESCAPE: 600 tty_insert_flip_string(&port->port, ch, 2); 601 i += 2; 602 escapeflag = true; 603 break; 604 default: 605 dev_warn(&port->dev, 606 "%s - unsupported command %i\n", 607 __func__, *(ch + 2)); 608 break; 609 } 610 if (escapeflag) 611 continue; 612 } 613 614 tty_insert_flip_char(&port->port, *ch, TTY_NORMAL); 615 } 616 617 tty_flip_buffer_push(&port->port); 618 } 619 620 static void qt2_write_bulk_callback(struct urb *urb) 621 { 622 struct usb_serial_port *port; 623 struct qt2_port_private *port_priv; 624 unsigned long flags; 625 626 port = urb->context; 627 port_priv = usb_get_serial_port_data(port); 628 629 spin_lock_irqsave(&port_priv->urb_lock, flags); 630 631 port_priv->urb_in_use = false; 632 usb_serial_port_softint(port); 633 634 spin_unlock_irqrestore(&port_priv->urb_lock, flags); 635 636 } 637 638 static void qt2_read_bulk_callback(struct urb *urb) 639 { 640 struct usb_serial *serial = urb->context; 641 int status; 642 643 if (urb->status) { 644 dev_warn(&serial->dev->dev, 645 "%s - non-zero urb status: %i\n", __func__, 646 urb->status); 647 return; 648 } 649 650 qt2_process_read_urb(urb); 651 652 status = usb_submit_urb(urb, GFP_ATOMIC); 653 if (status != 0) 654 dev_err(&serial->dev->dev, 655 "%s - resubmit read urb failed: %i\n", 656 __func__, status); 657 } 658 659 static int qt2_setup_urbs(struct usb_serial *serial) 660 { 661 struct usb_serial_port *port0; 662 struct qt2_serial_private *serial_priv; 663 int status; 664 665 port0 = serial->port[0]; 666 667 serial_priv = usb_get_serial_data(serial); 668 serial_priv->read_urb = usb_alloc_urb(0, GFP_KERNEL); 669 if (!serial_priv->read_urb) 670 return -ENOMEM; 671 672 usb_fill_bulk_urb(serial_priv->read_urb, serial->dev, 673 usb_rcvbulkpipe(serial->dev, 674 port0->bulk_in_endpointAddress), 675 serial_priv->read_buffer, 676 QT2_READ_BUFFER_SIZE, 677 qt2_read_bulk_callback, serial); 678 679 status = usb_submit_urb(serial_priv->read_urb, GFP_KERNEL); 680 if (status != 0) { 681 dev_err(&serial->dev->dev, 682 "%s - submit read urb failed %i\n", __func__, status); 683 usb_free_urb(serial_priv->read_urb); 684 return status; 685 } 686 687 return 0; 688 } 689 690 static int qt2_attach(struct usb_serial *serial) 691 { 692 struct qt2_serial_private *serial_priv; 693 int status; 694 695 /* power on unit */ 696 status = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 697 0xc2, 0x40, 0x8000, 0, NULL, 0, 698 QT2_USB_TIMEOUT); 699 if (status < 0) { 700 dev_err(&serial->dev->dev, 701 "%s - failed to power on unit: %i\n", __func__, status); 702 return status; 703 } 704 705 serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL); 706 if (!serial_priv) 707 return -ENOMEM; 708 709 serial_priv->read_buffer = kmalloc(QT2_READ_BUFFER_SIZE, GFP_KERNEL); 710 if (!serial_priv->read_buffer) { 711 status = -ENOMEM; 712 goto err_buf; 713 } 714 715 usb_set_serial_data(serial, serial_priv); 716 717 status = qt2_setup_urbs(serial); 718 if (status != 0) 719 goto attach_failed; 720 721 return 0; 722 723 attach_failed: 724 kfree(serial_priv->read_buffer); 725 err_buf: 726 kfree(serial_priv); 727 return status; 728 } 729 730 static int qt2_port_probe(struct usb_serial_port *port) 731 { 732 struct usb_serial *serial = port->serial; 733 struct qt2_port_private *port_priv; 734 u8 bEndpointAddress; 735 736 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL); 737 if (!port_priv) 738 return -ENOMEM; 739 740 spin_lock_init(&port_priv->lock); 741 spin_lock_init(&port_priv->urb_lock); 742 port_priv->port = port; 743 744 port_priv->write_buffer = kmalloc(QT2_WRITE_BUFFER_SIZE, GFP_KERNEL); 745 if (!port_priv->write_buffer) 746 goto err_buf; 747 748 port_priv->write_urb = usb_alloc_urb(0, GFP_KERNEL); 749 if (!port_priv->write_urb) 750 goto err_urb; 751 752 bEndpointAddress = serial->port[0]->bulk_out_endpointAddress; 753 usb_fill_bulk_urb(port_priv->write_urb, serial->dev, 754 usb_sndbulkpipe(serial->dev, bEndpointAddress), 755 port_priv->write_buffer, 756 QT2_WRITE_BUFFER_SIZE, 757 qt2_write_bulk_callback, port); 758 759 usb_set_serial_port_data(port, port_priv); 760 761 return 0; 762 err_urb: 763 kfree(port_priv->write_buffer); 764 err_buf: 765 kfree(port_priv); 766 return -ENOMEM; 767 } 768 769 static int qt2_port_remove(struct usb_serial_port *port) 770 { 771 struct qt2_port_private *port_priv; 772 773 port_priv = usb_get_serial_port_data(port); 774 usb_free_urb(port_priv->write_urb); 775 kfree(port_priv->write_buffer); 776 kfree(port_priv); 777 778 return 0; 779 } 780 781 static int qt2_tiocmget(struct tty_struct *tty) 782 { 783 struct usb_serial_port *port = tty->driver_data; 784 struct usb_device *dev = port->serial->dev; 785 struct qt2_port_private *port_priv = usb_get_serial_port_data(port); 786 u8 *d; 787 int r; 788 789 d = kzalloc(2, GFP_KERNEL); 790 if (!d) 791 return -ENOMEM; 792 793 r = qt2_getregister(dev, port_priv->device_port, UART_MCR, d); 794 if (r < 0) 795 goto mget_out; 796 797 r = qt2_getregister(dev, port_priv->device_port, UART_MSR, d + 1); 798 if (r < 0) 799 goto mget_out; 800 801 r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) | 802 (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) | 803 (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) | 804 (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) | 805 (d[1] & UART_MSR_RI ? TIOCM_RI : 0) | 806 (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0); 807 808 mget_out: 809 kfree(d); 810 return r; 811 } 812 813 static int qt2_tiocmset(struct tty_struct *tty, 814 unsigned int set, unsigned int clear) 815 { 816 struct qt2_port_private *port_priv; 817 818 port_priv = usb_get_serial_port_data(tty->driver_data); 819 return update_mctrl(port_priv, set, clear); 820 } 821 822 static void qt2_break_ctl(struct tty_struct *tty, int break_state) 823 { 824 struct usb_serial_port *port = tty->driver_data; 825 struct qt2_port_private *port_priv; 826 int status; 827 u16 val; 828 829 port_priv = usb_get_serial_port_data(port); 830 831 val = (break_state == -1) ? 1 : 0; 832 833 status = qt2_control_msg(port->serial->dev, QT2_BREAK_CONTROL, 834 val, port_priv->device_port); 835 if (status < 0) 836 dev_warn(&port->dev, 837 "%s - failed to send control message: %i\n", __func__, 838 status); 839 } 840 841 842 843 static void qt2_dtr_rts(struct usb_serial_port *port, int on) 844 { 845 struct usb_device *dev = port->serial->dev; 846 struct qt2_port_private *port_priv = usb_get_serial_port_data(port); 847 848 /* Disable flow control */ 849 if (!on) { 850 if (qt2_setregister(dev, port_priv->device_port, 851 UART_MCR, 0) < 0) 852 dev_warn(&port->dev, "error from flowcontrol urb\n"); 853 } 854 /* drop RTS and DTR */ 855 if (on) 856 update_mctrl(port_priv, TIOCM_DTR | TIOCM_RTS, 0); 857 else 858 update_mctrl(port_priv, 0, TIOCM_DTR | TIOCM_RTS); 859 } 860 861 static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch) 862 { 863 struct qt2_port_private *port_priv; 864 u8 newMSR = (u8) *ch; 865 unsigned long flags; 866 867 port_priv = usb_get_serial_port_data(port); 868 869 spin_lock_irqsave(&port_priv->lock, flags); 870 port_priv->shadowMSR = newMSR; 871 spin_unlock_irqrestore(&port_priv->lock, flags); 872 873 if (newMSR & UART_MSR_ANY_DELTA) { 874 /* update input line counters */ 875 if (newMSR & UART_MSR_DCTS) 876 port->icount.cts++; 877 if (newMSR & UART_MSR_DDSR) 878 port->icount.dsr++; 879 if (newMSR & UART_MSR_DDCD) 880 port->icount.dcd++; 881 if (newMSR & UART_MSR_TERI) 882 port->icount.rng++; 883 884 wake_up_interruptible(&port->port.delta_msr_wait); 885 } 886 } 887 888 static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch) 889 { 890 struct qt2_port_private *port_priv; 891 struct async_icount *icount; 892 unsigned long flags; 893 u8 newLSR = (u8) *ch; 894 895 port_priv = usb_get_serial_port_data(port); 896 897 if (newLSR & UART_LSR_BI) 898 newLSR &= (u8) (UART_LSR_OE | UART_LSR_BI); 899 900 spin_lock_irqsave(&port_priv->lock, flags); 901 port_priv->shadowLSR = newLSR; 902 spin_unlock_irqrestore(&port_priv->lock, flags); 903 904 icount = &port->icount; 905 906 if (newLSR & UART_LSR_BRK_ERROR_BITS) { 907 908 if (newLSR & UART_LSR_BI) 909 icount->brk++; 910 911 if (newLSR & UART_LSR_OE) 912 icount->overrun++; 913 914 if (newLSR & UART_LSR_PE) 915 icount->parity++; 916 917 if (newLSR & UART_LSR_FE) 918 icount->frame++; 919 } 920 921 } 922 923 static int qt2_write_room(struct tty_struct *tty) 924 { 925 struct usb_serial_port *port = tty->driver_data; 926 struct qt2_port_private *port_priv; 927 unsigned long flags = 0; 928 int r; 929 930 port_priv = usb_get_serial_port_data(port); 931 932 spin_lock_irqsave(&port_priv->urb_lock, flags); 933 934 if (port_priv->urb_in_use) 935 r = 0; 936 else 937 r = QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE; 938 939 spin_unlock_irqrestore(&port_priv->urb_lock, flags); 940 941 return r; 942 } 943 944 static int qt2_write(struct tty_struct *tty, 945 struct usb_serial_port *port, 946 const unsigned char *buf, int count) 947 { 948 struct qt2_port_private *port_priv; 949 struct urb *write_urb; 950 unsigned char *data; 951 unsigned long flags; 952 int status; 953 int bytes_out = 0; 954 955 port_priv = usb_get_serial_port_data(port); 956 957 if (port_priv->write_urb == NULL) { 958 dev_err(&port->dev, "%s - no output urb\n", __func__); 959 return 0; 960 } 961 write_urb = port_priv->write_urb; 962 963 count = min(count, QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE); 964 965 data = write_urb->transfer_buffer; 966 spin_lock_irqsave(&port_priv->urb_lock, flags); 967 if (port_priv->urb_in_use) { 968 dev_err(&port->dev, "qt2_write - urb is in use\n"); 969 goto write_out; 970 } 971 972 *data++ = QT2_CONTROL_BYTE; 973 *data++ = QT2_CONTROL_BYTE; 974 *data++ = port_priv->device_port; 975 put_unaligned_le16(count, data); 976 data += 2; 977 memcpy(data, buf, count); 978 979 write_urb->transfer_buffer_length = count + QT2_WRITE_CONTROL_SIZE; 980 981 status = usb_submit_urb(write_urb, GFP_ATOMIC); 982 if (status == 0) { 983 port_priv->urb_in_use = true; 984 bytes_out += count; 985 } 986 987 write_out: 988 spin_unlock_irqrestore(&port_priv->urb_lock, flags); 989 return bytes_out; 990 } 991 992 993 static struct usb_serial_driver qt2_device = { 994 .driver = { 995 .owner = THIS_MODULE, 996 .name = "quatech-serial", 997 }, 998 .description = DRIVER_DESC, 999 .id_table = id_table, 1000 .open = qt2_open, 1001 .close = qt2_close, 1002 .write = qt2_write, 1003 .write_room = qt2_write_room, 1004 .calc_num_ports = qt2_calc_num_ports, 1005 .attach = qt2_attach, 1006 .release = qt2_release, 1007 .disconnect = qt2_disconnect, 1008 .port_probe = qt2_port_probe, 1009 .port_remove = qt2_port_remove, 1010 .dtr_rts = qt2_dtr_rts, 1011 .break_ctl = qt2_break_ctl, 1012 .tiocmget = qt2_tiocmget, 1013 .tiocmset = qt2_tiocmset, 1014 .tiocmiwait = usb_serial_generic_tiocmiwait, 1015 .get_icount = usb_serial_generic_get_icount, 1016 .ioctl = qt2_ioctl, 1017 .set_termios = qt2_set_termios, 1018 }; 1019 1020 static struct usb_serial_driver *const serial_drivers[] = { 1021 &qt2_device, NULL 1022 }; 1023 1024 module_usb_serial_driver(serial_drivers, id_table); 1025 1026 MODULE_DESCRIPTION(DRIVER_DESC); 1027 MODULE_LICENSE("GPL v2"); 1028