1 /* 2 * usb-serial driver for Quatech USB 2 devices 3 * 4 * Copyright (C) 2012 Bill Pemberton (wfp5p@virginia.edu) 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License version 2 8 * as published by the Free Software Foundation. 9 * 10 * 11 * These devices all have only 1 bulk in and 1 bulk out that is shared 12 * for all serial ports. 13 * 14 */ 15 16 #include <asm/unaligned.h> 17 #include <linux/errno.h> 18 #include <linux/init.h> 19 #include <linux/slab.h> 20 #include <linux/tty.h> 21 #include <linux/tty_driver.h> 22 #include <linux/tty_flip.h> 23 #include <linux/module.h> 24 #include <linux/serial.h> 25 #include <linux/usb.h> 26 #include <linux/usb/serial.h> 27 #include <linux/serial_reg.h> 28 #include <linux/uaccess.h> 29 30 /* default urb timeout for usb operations */ 31 #define QT2_USB_TIMEOUT USB_CTRL_SET_TIMEOUT 32 33 #define QT_OPEN_CLOSE_CHANNEL 0xca 34 #define QT_SET_GET_DEVICE 0xc2 35 #define QT_SET_GET_REGISTER 0xc0 36 #define QT_GET_SET_PREBUF_TRIG_LVL 0xcc 37 #define QT_SET_ATF 0xcd 38 #define QT_TRANSFER_IN 0xc0 39 #define QT_HW_FLOW_CONTROL_MASK 0xc5 40 #define QT_SW_FLOW_CONTROL_MASK 0xc6 41 #define QT2_BREAK_CONTROL 0xc8 42 #define QT2_GET_SET_UART 0xc1 43 #define QT2_FLUSH_DEVICE 0xc4 44 #define QT2_GET_SET_QMCR 0xe1 45 #define QT2_QMCR_RS232 0x40 46 #define QT2_QMCR_RS422 0x10 47 48 #define SERIAL_CRTSCTS ((UART_MCR_RTS << 8) | UART_MSR_CTS) 49 50 #define SERIAL_EVEN_PARITY (UART_LCR_PARITY | UART_LCR_EPAR) 51 52 /* status bytes for the device */ 53 #define QT2_CONTROL_BYTE 0x1b 54 #define QT2_LINE_STATUS 0x00 /* following 1 byte is line status */ 55 #define QT2_MODEM_STATUS 0x01 /* following 1 byte is modem status */ 56 #define QT2_XMIT_HOLD 0x02 /* following 2 bytes are ?? */ 57 #define QT2_CHANGE_PORT 0x03 /* following 1 byte is port to change to */ 58 #define QT2_REC_FLUSH 0x04 /* no following info */ 59 #define QT2_XMIT_FLUSH 0x05 /* no following info */ 60 #define QT2_CONTROL_ESCAPE 0xff /* pass through previous 2 control bytes */ 61 62 #define MAX_BAUD_RATE 921600 63 #define DEFAULT_BAUD_RATE 9600 64 65 #define QT2_WRITE_BUFFER_SIZE 512 /* size of write buffer */ 66 #define QT2_WRITE_CONTROL_SIZE 5 /* control bytes used for a write */ 67 68 #define DRIVER_DESC "Quatech 2nd gen USB to Serial Driver" 69 70 #define USB_VENDOR_ID_QUATECH 0x061d 71 #define QUATECH_SSU2_100 0xC120 /* RS232 single port */ 72 #define QUATECH_DSU2_100 0xC140 /* RS232 dual port */ 73 #define QUATECH_DSU2_400 0xC150 /* RS232/422/485 dual port */ 74 #define QUATECH_QSU2_100 0xC160 /* RS232 four port */ 75 #define QUATECH_QSU2_400 0xC170 /* RS232/422/485 four port */ 76 #define QUATECH_ESU2_100 0xC1A0 /* RS232 eight port */ 77 #define QUATECH_ESU2_400 0xC180 /* RS232/422/485 eight port */ 78 79 struct qt2_device_detail { 80 int product_id; 81 int num_ports; 82 }; 83 84 #define QT_DETAILS(prod, ports) \ 85 .product_id = (prod), \ 86 .num_ports = (ports) 87 88 static const struct qt2_device_detail qt2_device_details[] = { 89 {QT_DETAILS(QUATECH_SSU2_100, 1)}, 90 {QT_DETAILS(QUATECH_DSU2_400, 2)}, 91 {QT_DETAILS(QUATECH_DSU2_100, 2)}, 92 {QT_DETAILS(QUATECH_QSU2_400, 4)}, 93 {QT_DETAILS(QUATECH_QSU2_100, 4)}, 94 {QT_DETAILS(QUATECH_ESU2_400, 8)}, 95 {QT_DETAILS(QUATECH_ESU2_100, 8)}, 96 {QT_DETAILS(0, 0)} /* Terminating entry */ 97 }; 98 99 static const struct usb_device_id id_table[] = { 100 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_SSU2_100)}, 101 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU2_100)}, 102 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU2_400)}, 103 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU2_100)}, 104 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU2_400)}, 105 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU2_100)}, 106 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU2_400)}, 107 {} /* Terminating entry */ 108 }; 109 MODULE_DEVICE_TABLE(usb, id_table); 110 111 struct qt2_serial_private { 112 unsigned char current_port; /* current port for incoming data */ 113 114 struct urb *read_urb; /* shared among all ports */ 115 char read_buffer[512]; 116 }; 117 118 struct qt2_port_private { 119 bool is_open; 120 u8 device_port; 121 122 spinlock_t urb_lock; 123 bool urb_in_use; 124 struct urb *write_urb; 125 char write_buffer[QT2_WRITE_BUFFER_SIZE]; 126 127 spinlock_t lock; 128 u8 shadowLSR; 129 u8 shadowMSR; 130 131 wait_queue_head_t delta_msr_wait; /* Used for TIOCMIWAIT */ 132 struct async_icount icount; 133 134 struct usb_serial_port *port; 135 }; 136 137 static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch); 138 static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch); 139 static void qt2_write_bulk_callback(struct urb *urb); 140 static void qt2_read_bulk_callback(struct urb *urb); 141 142 static void qt2_release(struct usb_serial *serial) 143 { 144 struct qt2_serial_private *serial_priv; 145 146 serial_priv = usb_get_serial_data(serial); 147 148 usb_free_urb(serial_priv->read_urb); 149 kfree(serial_priv); 150 } 151 152 static inline int calc_baud_divisor(int baudrate) 153 { 154 int divisor, rem; 155 156 divisor = MAX_BAUD_RATE / baudrate; 157 rem = MAX_BAUD_RATE % baudrate; 158 /* Round to nearest divisor */ 159 if (((rem * 2) >= baudrate) && (baudrate != 110)) 160 divisor++; 161 162 return divisor; 163 } 164 165 static inline int qt2_set_port_config(struct usb_device *dev, 166 unsigned char port_number, 167 u16 baudrate, u16 lcr) 168 { 169 int divisor = calc_baud_divisor(baudrate); 170 u16 index = ((u16) (lcr << 8) | (u16) (port_number)); 171 172 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), 173 QT2_GET_SET_UART, 0x40, 174 divisor, index, NULL, 0, QT2_USB_TIMEOUT); 175 } 176 177 static inline int qt2_control_msg(struct usb_device *dev, 178 u8 request, u16 data, u16 index) 179 { 180 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), 181 request, 0x40, data, index, 182 NULL, 0, QT2_USB_TIMEOUT); 183 } 184 185 static inline int qt2_setdevice(struct usb_device *dev, u8 *data) 186 { 187 u16 x = ((u16) (data[1] << 8) | (u16) (data[0])); 188 189 return qt2_control_msg(dev, QT_SET_GET_DEVICE, x, 0); 190 } 191 192 193 static inline int qt2_getdevice(struct usb_device *dev, u8 *data) 194 { 195 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), 196 QT_SET_GET_DEVICE, 0xc0, 0, 0, 197 data, 3, QT2_USB_TIMEOUT); 198 } 199 200 static inline int qt2_getregister(struct usb_device *dev, 201 u8 uart, 202 u8 reg, 203 u8 *data) 204 { 205 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), 206 QT_SET_GET_REGISTER, 0xc0, reg, 207 uart, data, sizeof(*data), QT2_USB_TIMEOUT); 208 209 } 210 211 static inline int qt2_setregister(struct usb_device *dev, 212 u8 uart, u8 reg, u16 data) 213 { 214 u16 value = (data << 8) | reg; 215 216 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), 217 QT_SET_GET_REGISTER, 0x40, value, uart, 218 NULL, 0, QT2_USB_TIMEOUT); 219 } 220 221 static inline int update_mctrl(struct qt2_port_private *port_priv, 222 unsigned int set, unsigned int clear) 223 { 224 struct usb_serial_port *port = port_priv->port; 225 struct usb_device *dev = port->serial->dev; 226 unsigned urb_value; 227 int status; 228 229 if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0) { 230 dev_dbg(&port->dev, 231 "update_mctrl - DTR|RTS not being set|cleared\n"); 232 return 0; /* no change */ 233 } 234 235 clear &= ~set; /* 'set' takes precedence over 'clear' */ 236 urb_value = 0; 237 if (set & TIOCM_DTR) 238 urb_value |= UART_MCR_DTR; 239 if (set & TIOCM_RTS) 240 urb_value |= UART_MCR_RTS; 241 242 status = qt2_setregister(dev, port_priv->device_port, UART_MCR, 243 urb_value); 244 if (status < 0) 245 dev_err(&port->dev, 246 "update_mctrl - Error from MODEM_CTRL urb: %i\n", 247 status); 248 return status; 249 } 250 251 static int qt2_calc_num_ports(struct usb_serial *serial) 252 { 253 struct qt2_device_detail d; 254 int i; 255 256 for (i = 0; d = qt2_device_details[i], d.product_id != 0; i++) { 257 if (d.product_id == le16_to_cpu(serial->dev->descriptor.idProduct)) 258 return d.num_ports; 259 } 260 261 /* we didn't recognize the device */ 262 dev_err(&serial->dev->dev, 263 "don't know the number of ports, assuming 1\n"); 264 265 return 1; 266 } 267 268 static void qt2_set_termios(struct tty_struct *tty, 269 struct usb_serial_port *port, 270 struct ktermios *old_termios) 271 { 272 struct usb_device *dev = port->serial->dev; 273 struct qt2_port_private *port_priv; 274 struct ktermios *termios = &tty->termios; 275 u16 baud; 276 unsigned int cflag = termios->c_cflag; 277 u16 new_lcr = 0; 278 int status; 279 280 port_priv = usb_get_serial_port_data(port); 281 282 if (cflag & PARENB) { 283 if (cflag & PARODD) 284 new_lcr |= UART_LCR_PARITY; 285 else 286 new_lcr |= SERIAL_EVEN_PARITY; 287 } 288 289 switch (cflag & CSIZE) { 290 case CS5: 291 new_lcr |= UART_LCR_WLEN5; 292 break; 293 case CS6: 294 new_lcr |= UART_LCR_WLEN6; 295 break; 296 case CS7: 297 new_lcr |= UART_LCR_WLEN7; 298 break; 299 default: 300 case CS8: 301 new_lcr |= UART_LCR_WLEN8; 302 break; 303 } 304 305 baud = tty_get_baud_rate(tty); 306 if (!baud) 307 baud = 9600; 308 309 status = qt2_set_port_config(dev, port_priv->device_port, baud, 310 new_lcr); 311 if (status < 0) 312 dev_err(&port->dev, "%s - qt2_set_port_config failed: %i\n", 313 __func__, status); 314 315 if (cflag & CRTSCTS) 316 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK, 317 SERIAL_CRTSCTS, 318 port_priv->device_port); 319 else 320 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK, 321 0, port_priv->device_port); 322 if (status < 0) 323 dev_err(&port->dev, "%s - set HW flow control failed: %i\n", 324 __func__, status); 325 326 if (I_IXOFF(tty) || I_IXON(tty)) { 327 u16 x = ((u16) (START_CHAR(tty) << 8) | (u16) (STOP_CHAR(tty))); 328 329 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK, 330 x, port_priv->device_port); 331 } else 332 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK, 333 0, port_priv->device_port); 334 335 if (status < 0) 336 dev_err(&port->dev, "%s - set SW flow control failed: %i\n", 337 __func__, status); 338 339 } 340 341 static int qt2_open(struct tty_struct *tty, struct usb_serial_port *port) 342 { 343 struct usb_serial *serial; 344 struct qt2_port_private *port_priv; 345 u8 *data; 346 u16 device_port; 347 int status; 348 unsigned long flags; 349 350 device_port = (u16) (port->number - port->serial->minor); 351 352 serial = port->serial; 353 354 port_priv = usb_get_serial_port_data(port); 355 356 /* set the port to RS232 mode */ 357 status = qt2_control_msg(serial->dev, QT2_GET_SET_QMCR, 358 QT2_QMCR_RS232, device_port); 359 if (status < 0) { 360 dev_err(&port->dev, 361 "%s failed to set RS232 mode for port %i error %i\n", 362 __func__, device_port, status); 363 return status; 364 } 365 366 data = kzalloc(2, GFP_KERNEL); 367 if (!data) 368 return -ENOMEM; 369 370 /* open the port */ 371 status = usb_control_msg(serial->dev, 372 usb_rcvctrlpipe(serial->dev, 0), 373 QT_OPEN_CLOSE_CHANNEL, 374 0xc0, 0, 375 device_port, data, 2, QT2_USB_TIMEOUT); 376 377 if (status < 0) { 378 dev_err(&port->dev, "%s - open port failed %i", __func__, 379 status); 380 kfree(data); 381 return status; 382 } 383 384 spin_lock_irqsave(&port_priv->lock, flags); 385 port_priv->shadowLSR = data[0]; 386 port_priv->shadowMSR = data[1]; 387 spin_unlock_irqrestore(&port_priv->lock, flags); 388 389 kfree(data); 390 391 /* set to default speed and 8bit word size */ 392 status = qt2_set_port_config(serial->dev, device_port, 393 DEFAULT_BAUD_RATE, UART_LCR_WLEN8); 394 if (status < 0) { 395 dev_err(&port->dev, 396 "%s - initial setup failed for port %i (%i)\n", 397 __func__, port->number, device_port); 398 return status; 399 } 400 401 port_priv->is_open = true; 402 port_priv->device_port = (u8) device_port; 403 404 if (tty) 405 qt2_set_termios(tty, port, &tty->termios); 406 407 return 0; 408 409 } 410 411 static void qt2_close(struct usb_serial_port *port) 412 { 413 struct usb_serial *serial; 414 struct qt2_port_private *port_priv; 415 unsigned long flags; 416 int i; 417 418 serial = port->serial; 419 port_priv = usb_get_serial_port_data(port); 420 421 port_priv->is_open = false; 422 423 spin_lock_irqsave(&port_priv->urb_lock, flags); 424 usb_kill_urb(port_priv->write_urb); 425 port_priv->urb_in_use = false; 426 spin_unlock_irqrestore(&port_priv->urb_lock, flags); 427 428 mutex_lock(&port->serial->disc_mutex); 429 if (port->serial->disconnected) { 430 mutex_unlock(&port->serial->disc_mutex); 431 return; 432 } 433 434 /* flush the port transmit buffer */ 435 i = usb_control_msg(serial->dev, 436 usb_rcvctrlpipe(serial->dev, 0), 437 QT2_FLUSH_DEVICE, 0x40, 1, 438 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT); 439 440 if (i < 0) 441 dev_err(&port->dev, "%s - transmit buffer flush failed: %i\n", 442 __func__, i); 443 444 /* flush the port receive buffer */ 445 i = usb_control_msg(serial->dev, 446 usb_rcvctrlpipe(serial->dev, 0), 447 QT2_FLUSH_DEVICE, 0x40, 0, 448 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT); 449 450 if (i < 0) 451 dev_err(&port->dev, "%s - receive buffer flush failed: %i\n", 452 __func__, i); 453 454 /* close the port */ 455 i = usb_control_msg(serial->dev, 456 usb_sndctrlpipe(serial->dev, 0), 457 QT_OPEN_CLOSE_CHANNEL, 458 0x40, 0, 459 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT); 460 461 if (i < 0) 462 dev_err(&port->dev, "%s - close port failed %i\n", 463 __func__, i); 464 465 mutex_unlock(&port->serial->disc_mutex); 466 } 467 468 static void qt2_disconnect(struct usb_serial *serial) 469 { 470 struct qt2_serial_private *serial_priv = usb_get_serial_data(serial); 471 472 usb_kill_urb(serial_priv->read_urb); 473 } 474 475 static int get_serial_info(struct usb_serial_port *port, 476 struct serial_struct __user *retinfo) 477 { 478 struct serial_struct tmp; 479 480 if (!retinfo) 481 return -EFAULT; 482 483 memset(&tmp, 0, sizeof(tmp)); 484 tmp.line = port->serial->minor; 485 tmp.port = 0; 486 tmp.irq = 0; 487 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ; 488 tmp.xmit_fifo_size = port->bulk_out_size; 489 tmp.baud_base = 9600; 490 tmp.close_delay = 5*HZ; 491 tmp.closing_wait = 30*HZ; 492 493 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) 494 return -EFAULT; 495 return 0; 496 } 497 498 static int wait_modem_info(struct usb_serial_port *port, unsigned int arg) 499 { 500 struct qt2_port_private *priv = usb_get_serial_port_data(port); 501 struct async_icount prev, cur; 502 unsigned long flags; 503 504 spin_lock_irqsave(&priv->lock, flags); 505 prev = priv->icount; 506 spin_unlock_irqrestore(&priv->lock, flags); 507 508 while (1) { 509 wait_event_interruptible(priv->delta_msr_wait, 510 ((priv->icount.rng != prev.rng) || 511 (priv->icount.dsr != prev.dsr) || 512 (priv->icount.dcd != prev.dcd) || 513 (priv->icount.cts != prev.cts))); 514 515 if (signal_pending(current)) 516 return -ERESTARTSYS; 517 518 spin_lock_irqsave(&priv->lock, flags); 519 cur = priv->icount; 520 spin_unlock_irqrestore(&priv->lock, flags); 521 522 if ((prev.rng == cur.rng) && 523 (prev.dsr == cur.dsr) && 524 (prev.dcd == cur.dcd) && 525 (prev.cts == cur.cts)) 526 return -EIO; 527 528 if ((arg & TIOCM_RNG && (prev.rng != cur.rng)) || 529 (arg & TIOCM_DSR && (prev.dsr != cur.dsr)) || 530 (arg & TIOCM_CD && (prev.dcd != cur.dcd)) || 531 (arg & TIOCM_CTS && (prev.cts != cur.cts))) 532 return 0; 533 } 534 return 0; 535 } 536 537 static int qt2_get_icount(struct tty_struct *tty, 538 struct serial_icounter_struct *icount) 539 { 540 struct usb_serial_port *port = tty->driver_data; 541 struct qt2_port_private *priv = usb_get_serial_port_data(port); 542 struct async_icount cnow = priv->icount; 543 544 icount->cts = cnow.cts; 545 icount->dsr = cnow.dsr; 546 icount->rng = cnow.rng; 547 icount->dcd = cnow.dcd; 548 icount->rx = cnow.rx; 549 icount->tx = cnow.tx; 550 icount->frame = cnow.frame; 551 icount->overrun = cnow.overrun; 552 icount->parity = cnow.parity; 553 icount->brk = cnow.brk; 554 icount->buf_overrun = cnow.buf_overrun; 555 556 return 0; 557 } 558 559 static int qt2_ioctl(struct tty_struct *tty, 560 unsigned int cmd, unsigned long arg) 561 { 562 struct usb_serial_port *port = tty->driver_data; 563 564 switch (cmd) { 565 case TIOCGSERIAL: 566 return get_serial_info(port, 567 (struct serial_struct __user *)arg); 568 569 case TIOCMIWAIT: 570 return wait_modem_info(port, arg); 571 572 default: 573 break; 574 } 575 576 return -ENOIOCTLCMD; 577 } 578 579 static void qt2_process_status(struct usb_serial_port *port, unsigned char *ch) 580 { 581 switch (*ch) { 582 case QT2_LINE_STATUS: 583 qt2_update_lsr(port, ch + 1); 584 break; 585 case QT2_MODEM_STATUS: 586 qt2_update_msr(port, ch + 1); 587 break; 588 } 589 } 590 591 /* not needed, kept to document functionality */ 592 static void qt2_process_xmit_empty(struct usb_serial_port *port, 593 unsigned char *ch) 594 { 595 int bytes_written; 596 597 bytes_written = (int)(*ch) + (int)(*(ch + 1) << 4); 598 } 599 600 /* not needed, kept to document functionality */ 601 static void qt2_process_flush(struct usb_serial_port *port, unsigned char *ch) 602 { 603 return; 604 } 605 606 void qt2_process_read_urb(struct urb *urb) 607 { 608 struct usb_serial *serial; 609 struct qt2_serial_private *serial_priv; 610 struct usb_serial_port *port; 611 struct qt2_port_private *port_priv; 612 struct tty_struct *tty; 613 bool escapeflag; 614 unsigned char *ch; 615 int i; 616 unsigned char newport; 617 int len = urb->actual_length; 618 619 if (!len) 620 return; 621 622 ch = urb->transfer_buffer; 623 tty = NULL; 624 serial = urb->context; 625 serial_priv = usb_get_serial_data(serial); 626 port = serial->port[serial_priv->current_port]; 627 port_priv = usb_get_serial_port_data(port); 628 629 if (port_priv->is_open) 630 tty = tty_port_tty_get(&port->port); 631 632 for (i = 0; i < urb->actual_length; i++) { 633 ch = (unsigned char *)urb->transfer_buffer + i; 634 if ((i <= (len - 3)) && 635 (*ch == QT2_CONTROL_BYTE) && 636 (*(ch + 1) == QT2_CONTROL_BYTE)) { 637 escapeflag = false; 638 switch (*(ch + 2)) { 639 case QT2_LINE_STATUS: 640 case QT2_MODEM_STATUS: 641 if (i > (len - 4)) { 642 dev_warn(&port->dev, 643 "%s - status message too short\n", 644 __func__); 645 break; 646 } 647 qt2_process_status(port, ch + 2); 648 i += 3; 649 escapeflag = true; 650 break; 651 case QT2_XMIT_HOLD: 652 if (i > (len - 5)) { 653 dev_warn(&port->dev, 654 "%s - xmit_empty message too short\n", 655 __func__); 656 break; 657 } 658 qt2_process_xmit_empty(port, ch + 3); 659 i += 4; 660 escapeflag = true; 661 break; 662 case QT2_CHANGE_PORT: 663 if (i > (len - 4)) { 664 dev_warn(&port->dev, 665 "%s - change_port message too short\n", 666 __func__); 667 break; 668 } 669 if (tty) { 670 tty_flip_buffer_push(tty); 671 tty_kref_put(tty); 672 } 673 674 newport = *(ch + 3); 675 676 if (newport > serial->num_ports) { 677 dev_err(&port->dev, 678 "%s - port change to invalid port: %i\n", 679 __func__, newport); 680 break; 681 } 682 683 serial_priv->current_port = newport; 684 port = serial->port[serial_priv->current_port]; 685 port_priv = usb_get_serial_port_data(port); 686 if (port_priv->is_open) 687 tty = tty_port_tty_get(&port->port); 688 else 689 tty = NULL; 690 i += 3; 691 escapeflag = true; 692 break; 693 case QT2_REC_FLUSH: 694 case QT2_XMIT_FLUSH: 695 qt2_process_flush(port, ch + 2); 696 i += 2; 697 escapeflag = true; 698 break; 699 case QT2_CONTROL_ESCAPE: 700 tty_buffer_request_room(tty, 2); 701 tty_insert_flip_string(tty, ch, 2); 702 i += 2; 703 escapeflag = true; 704 break; 705 default: 706 dev_warn(&port->dev, 707 "%s - unsupported command %i\n", 708 __func__, *(ch + 2)); 709 break; 710 } 711 if (escapeflag) 712 continue; 713 } 714 715 if (tty) { 716 tty_buffer_request_room(tty, 1); 717 tty_insert_flip_string(tty, ch, 1); 718 } 719 } 720 721 if (tty) { 722 tty_flip_buffer_push(tty); 723 tty_kref_put(tty); 724 } 725 } 726 727 static void qt2_write_bulk_callback(struct urb *urb) 728 { 729 struct usb_serial_port *port; 730 struct qt2_port_private *port_priv; 731 732 port = urb->context; 733 port_priv = usb_get_serial_port_data(port); 734 735 spin_lock(&port_priv->urb_lock); 736 737 port_priv->urb_in_use = false; 738 usb_serial_port_softint(port); 739 740 spin_unlock(&port_priv->urb_lock); 741 742 } 743 744 static void qt2_read_bulk_callback(struct urb *urb) 745 { 746 struct usb_serial *serial = urb->context; 747 int status; 748 749 if (urb->status) { 750 dev_warn(&serial->dev->dev, 751 "%s - non-zero urb status: %i\n", __func__, 752 urb->status); 753 return; 754 } 755 756 qt2_process_read_urb(urb); 757 758 status = usb_submit_urb(urb, GFP_ATOMIC); 759 if (status != 0) 760 dev_err(&serial->dev->dev, 761 "%s - resubmit read urb failed: %i\n", 762 __func__, status); 763 } 764 765 static int qt2_setup_urbs(struct usb_serial *serial) 766 { 767 struct usb_serial_port *port0; 768 struct qt2_serial_private *serial_priv; 769 int status; 770 771 port0 = serial->port[0]; 772 773 serial_priv = usb_get_serial_data(serial); 774 serial_priv->read_urb = usb_alloc_urb(0, GFP_KERNEL); 775 if (!serial_priv->read_urb) { 776 dev_err(&serial->dev->dev, "No free urbs available\n"); 777 return -ENOMEM; 778 } 779 780 usb_fill_bulk_urb(serial_priv->read_urb, serial->dev, 781 usb_rcvbulkpipe(serial->dev, 782 port0->bulk_in_endpointAddress), 783 serial_priv->read_buffer, 784 sizeof(serial_priv->read_buffer), 785 qt2_read_bulk_callback, serial); 786 787 status = usb_submit_urb(serial_priv->read_urb, GFP_KERNEL); 788 if (status != 0) { 789 dev_err(&serial->dev->dev, 790 "%s - submit read urb failed %i\n", __func__, status); 791 usb_free_urb(serial_priv->read_urb); 792 return status; 793 } 794 795 return 0; 796 } 797 798 static int qt2_attach(struct usb_serial *serial) 799 { 800 struct qt2_serial_private *serial_priv; 801 int status; 802 803 /* power on unit */ 804 status = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 805 0xc2, 0x40, 0x8000, 0, NULL, 0, 806 QT2_USB_TIMEOUT); 807 if (status < 0) { 808 dev_err(&serial->dev->dev, 809 "%s - failed to power on unit: %i\n", __func__, status); 810 return status; 811 } 812 813 serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL); 814 if (!serial_priv) { 815 dev_err(&serial->dev->dev, "%s - Out of memory\n", __func__); 816 return -ENOMEM; 817 } 818 819 usb_set_serial_data(serial, serial_priv); 820 821 status = qt2_setup_urbs(serial); 822 if (status != 0) 823 goto attach_failed; 824 825 return 0; 826 827 attach_failed: 828 kfree(serial_priv); 829 return status; 830 } 831 832 static int qt2_port_probe(struct usb_serial_port *port) 833 { 834 struct usb_serial *serial = port->serial; 835 struct qt2_port_private *port_priv; 836 u8 bEndpointAddress; 837 838 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL); 839 if (!port_priv) 840 return -ENOMEM; 841 842 spin_lock_init(&port_priv->lock); 843 spin_lock_init(&port_priv->urb_lock); 844 init_waitqueue_head(&port_priv->delta_msr_wait); 845 port_priv->port = port; 846 847 port_priv->write_urb = usb_alloc_urb(0, GFP_KERNEL); 848 if (!port_priv->write_urb) { 849 kfree(port_priv); 850 return -ENOMEM; 851 } 852 bEndpointAddress = serial->port[0]->bulk_out_endpointAddress; 853 usb_fill_bulk_urb(port_priv->write_urb, serial->dev, 854 usb_sndbulkpipe(serial->dev, bEndpointAddress), 855 port_priv->write_buffer, 856 sizeof(port_priv->write_buffer), 857 qt2_write_bulk_callback, port); 858 859 usb_set_serial_port_data(port, port_priv); 860 861 return 0; 862 } 863 864 static int qt2_port_remove(struct usb_serial_port *port) 865 { 866 struct qt2_port_private *port_priv; 867 868 port_priv = usb_get_serial_port_data(port); 869 usb_free_urb(port_priv->write_urb); 870 kfree(port_priv); 871 872 return 0; 873 } 874 875 static int qt2_tiocmget(struct tty_struct *tty) 876 { 877 struct usb_serial_port *port = tty->driver_data; 878 struct usb_device *dev = port->serial->dev; 879 struct qt2_port_private *port_priv = usb_get_serial_port_data(port); 880 u8 *d; 881 int r; 882 883 d = kzalloc(2, GFP_KERNEL); 884 if (!d) 885 return -ENOMEM; 886 887 r = qt2_getregister(dev, port_priv->device_port, UART_MCR, d); 888 if (r < 0) 889 goto mget_out; 890 891 r = qt2_getregister(dev, port_priv->device_port, UART_MSR, d + 1); 892 if (r < 0) 893 goto mget_out; 894 895 r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) | 896 (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) | 897 (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) | 898 (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) | 899 (d[1] & UART_MSR_RI ? TIOCM_RI : 0) | 900 (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0); 901 902 mget_out: 903 kfree(d); 904 return r; 905 } 906 907 static int qt2_tiocmset(struct tty_struct *tty, 908 unsigned int set, unsigned int clear) 909 { 910 struct qt2_port_private *port_priv; 911 912 port_priv = usb_get_serial_port_data(tty->driver_data); 913 return update_mctrl(port_priv, set, clear); 914 } 915 916 static void qt2_break_ctl(struct tty_struct *tty, int break_state) 917 { 918 struct usb_serial_port *port = tty->driver_data; 919 struct qt2_port_private *port_priv; 920 int status; 921 u16 val; 922 923 port_priv = usb_get_serial_port_data(port); 924 925 if (!port_priv->is_open) { 926 dev_err(&port->dev, 927 "%s - port is not open\n", __func__); 928 return; 929 } 930 931 val = (break_state == -1) ? 1 : 0; 932 933 status = qt2_control_msg(port->serial->dev, QT2_BREAK_CONTROL, 934 val, port_priv->device_port); 935 if (status < 0) 936 dev_warn(&port->dev, 937 "%s - failed to send control message: %i\n", __func__, 938 status); 939 } 940 941 942 943 static void qt2_dtr_rts(struct usb_serial_port *port, int on) 944 { 945 struct usb_device *dev = port->serial->dev; 946 struct qt2_port_private *port_priv = usb_get_serial_port_data(port); 947 948 mutex_lock(&port->serial->disc_mutex); 949 if (!port->serial->disconnected) { 950 /* Disable flow control */ 951 if (!on && qt2_setregister(dev, port_priv->device_port, 952 UART_MCR, 0) < 0) 953 dev_warn(&port->dev, "error from flowcontrol urb\n"); 954 /* drop RTS and DTR */ 955 if (on) 956 update_mctrl(port_priv, TIOCM_DTR | TIOCM_RTS, 0); 957 else 958 update_mctrl(port_priv, 0, TIOCM_DTR | TIOCM_RTS); 959 } 960 mutex_unlock(&port->serial->disc_mutex); 961 } 962 963 static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch) 964 { 965 struct qt2_port_private *port_priv; 966 u8 newMSR = (u8) *ch; 967 unsigned long flags; 968 969 port_priv = usb_get_serial_port_data(port); 970 971 spin_lock_irqsave(&port_priv->lock, flags); 972 port_priv->shadowMSR = newMSR; 973 spin_unlock_irqrestore(&port_priv->lock, flags); 974 975 if (newMSR & UART_MSR_ANY_DELTA) { 976 /* update input line counters */ 977 if (newMSR & UART_MSR_DCTS) 978 port_priv->icount.cts++; 979 980 if (newMSR & UART_MSR_DDSR) 981 port_priv->icount.dsr++; 982 983 if (newMSR & UART_MSR_DDCD) 984 port_priv->icount.dcd++; 985 986 if (newMSR & UART_MSR_TERI) 987 port_priv->icount.rng++; 988 989 wake_up_interruptible(&port_priv->delta_msr_wait); 990 } 991 } 992 993 static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch) 994 { 995 struct qt2_port_private *port_priv; 996 struct async_icount *icount; 997 unsigned long flags; 998 u8 newLSR = (u8) *ch; 999 1000 port_priv = usb_get_serial_port_data(port); 1001 1002 if (newLSR & UART_LSR_BI) 1003 newLSR &= (u8) (UART_LSR_OE | UART_LSR_BI); 1004 1005 spin_lock_irqsave(&port_priv->lock, flags); 1006 port_priv->shadowLSR = newLSR; 1007 spin_unlock_irqrestore(&port_priv->lock, flags); 1008 1009 icount = &port_priv->icount; 1010 1011 if (newLSR & UART_LSR_BRK_ERROR_BITS) { 1012 1013 if (newLSR & UART_LSR_BI) 1014 icount->brk++; 1015 1016 if (newLSR & UART_LSR_OE) 1017 icount->overrun++; 1018 1019 if (newLSR & UART_LSR_PE) 1020 icount->parity++; 1021 1022 if (newLSR & UART_LSR_FE) 1023 icount->frame++; 1024 } 1025 1026 } 1027 1028 static int qt2_write_room(struct tty_struct *tty) 1029 { 1030 struct usb_serial_port *port = tty->driver_data; 1031 struct qt2_port_private *port_priv; 1032 unsigned long flags = 0; 1033 int r; 1034 1035 port_priv = usb_get_serial_port_data(port); 1036 1037 spin_lock_irqsave(&port_priv->urb_lock, flags); 1038 1039 if (port_priv->urb_in_use) 1040 r = 0; 1041 else 1042 r = QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE; 1043 1044 spin_unlock_irqrestore(&port_priv->urb_lock, flags); 1045 1046 return r; 1047 } 1048 1049 static int qt2_write(struct tty_struct *tty, 1050 struct usb_serial_port *port, 1051 const unsigned char *buf, int count) 1052 { 1053 struct qt2_port_private *port_priv; 1054 struct urb *write_urb; 1055 unsigned char *data; 1056 unsigned long flags; 1057 int status; 1058 int bytes_out = 0; 1059 1060 port_priv = usb_get_serial_port_data(port); 1061 1062 if (port_priv->write_urb == NULL) { 1063 dev_err(&port->dev, "%s - no output urb\n", __func__); 1064 return 0; 1065 } 1066 write_urb = port_priv->write_urb; 1067 1068 count = min(count, QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE); 1069 1070 data = write_urb->transfer_buffer; 1071 spin_lock_irqsave(&port_priv->urb_lock, flags); 1072 if (port_priv->urb_in_use == true) { 1073 dev_err(&port->dev, "qt2_write - urb is in use\n"); 1074 goto write_out; 1075 } 1076 1077 *data++ = QT2_CONTROL_BYTE; 1078 *data++ = QT2_CONTROL_BYTE; 1079 *data++ = port_priv->device_port; 1080 put_unaligned_le16(count, data); 1081 data += 2; 1082 memcpy(data, buf, count); 1083 1084 write_urb->transfer_buffer_length = count + QT2_WRITE_CONTROL_SIZE; 1085 1086 status = usb_submit_urb(write_urb, GFP_ATOMIC); 1087 if (status == 0) { 1088 port_priv->urb_in_use = true; 1089 bytes_out += count; 1090 } 1091 1092 write_out: 1093 spin_unlock_irqrestore(&port_priv->urb_lock, flags); 1094 return bytes_out; 1095 } 1096 1097 1098 static struct usb_serial_driver qt2_device = { 1099 .driver = { 1100 .owner = THIS_MODULE, 1101 .name = "quatech-serial", 1102 }, 1103 .description = DRIVER_DESC, 1104 .id_table = id_table, 1105 .open = qt2_open, 1106 .close = qt2_close, 1107 .write = qt2_write, 1108 .write_room = qt2_write_room, 1109 .calc_num_ports = qt2_calc_num_ports, 1110 .attach = qt2_attach, 1111 .release = qt2_release, 1112 .disconnect = qt2_disconnect, 1113 .port_probe = qt2_port_probe, 1114 .port_remove = qt2_port_remove, 1115 .dtr_rts = qt2_dtr_rts, 1116 .break_ctl = qt2_break_ctl, 1117 .tiocmget = qt2_tiocmget, 1118 .tiocmset = qt2_tiocmset, 1119 .get_icount = qt2_get_icount, 1120 .ioctl = qt2_ioctl, 1121 .set_termios = qt2_set_termios, 1122 }; 1123 1124 static struct usb_serial_driver *const serial_drivers[] = { 1125 &qt2_device, NULL 1126 }; 1127 1128 module_usb_serial_driver(serial_drivers, id_table); 1129 1130 MODULE_DESCRIPTION(DRIVER_DESC); 1131 MODULE_LICENSE("GPL"); 1132