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 /* Version Information */ 69 #define DRIVER_VERSION "v0.1" 70 #define DRIVER_DESC "Quatech 2nd gen USB to Serial Driver" 71 72 #define USB_VENDOR_ID_QUATECH 0x061d 73 #define QUATECH_SSU2_100 0xC120 /* RS232 single port */ 74 #define QUATECH_DSU2_100 0xC140 /* RS232 dual port */ 75 #define QUATECH_DSU2_400 0xC150 /* RS232/422/485 dual port */ 76 #define QUATECH_QSU2_100 0xC160 /* RS232 four port */ 77 #define QUATECH_QSU2_400 0xC170 /* RS232/422/485 four port */ 78 #define QUATECH_ESU2_100 0xC1A0 /* RS232 eight port */ 79 #define QUATECH_ESU2_400 0xC180 /* RS232/422/485 eight port */ 80 81 struct qt2_device_detail { 82 int product_id; 83 int num_ports; 84 }; 85 86 #define QT_DETAILS(prod, ports) \ 87 .product_id = (prod), \ 88 .num_ports = (ports) 89 90 static const struct qt2_device_detail qt2_device_details[] = { 91 {QT_DETAILS(QUATECH_SSU2_100, 1)}, 92 {QT_DETAILS(QUATECH_DSU2_400, 2)}, 93 {QT_DETAILS(QUATECH_DSU2_100, 2)}, 94 {QT_DETAILS(QUATECH_QSU2_400, 4)}, 95 {QT_DETAILS(QUATECH_QSU2_100, 4)}, 96 {QT_DETAILS(QUATECH_ESU2_400, 8)}, 97 {QT_DETAILS(QUATECH_ESU2_100, 8)}, 98 {QT_DETAILS(0, 0)} /* Terminating entry */ 99 }; 100 101 static const struct usb_device_id id_table[] = { 102 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_SSU2_100)}, 103 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU2_100)}, 104 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU2_400)}, 105 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU2_100)}, 106 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU2_400)}, 107 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU2_100)}, 108 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU2_400)}, 109 {} /* Terminating entry */ 110 }; 111 MODULE_DEVICE_TABLE(usb, id_table); 112 113 struct qt2_serial_private { 114 unsigned char current_port; /* current port for incoming data */ 115 116 struct urb *read_urb; /* shared among all ports */ 117 char read_buffer[512]; 118 }; 119 120 struct qt2_port_private { 121 bool is_open; 122 u8 device_port; 123 124 spinlock_t urb_lock; 125 bool urb_in_use; 126 struct urb *write_urb; 127 char write_buffer[QT2_WRITE_BUFFER_SIZE]; 128 129 spinlock_t lock; 130 u8 shadowLSR; 131 u8 shadowMSR; 132 133 wait_queue_head_t delta_msr_wait; /* Used for TIOCMIWAIT */ 134 struct async_icount icount; 135 136 struct usb_serial_port *port; 137 }; 138 139 static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch); 140 static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch); 141 static void qt2_write_bulk_callback(struct urb *urb); 142 static void qt2_read_bulk_callback(struct urb *urb); 143 144 static void qt2_release(struct usb_serial *serial) 145 { 146 struct qt2_serial_private *serial_priv; 147 148 serial_priv = usb_get_serial_data(serial); 149 150 usb_free_urb(serial_priv->read_urb); 151 kfree(serial_priv); 152 } 153 154 static inline int calc_baud_divisor(int baudrate) 155 { 156 int divisor, rem; 157 158 divisor = MAX_BAUD_RATE / baudrate; 159 rem = MAX_BAUD_RATE % baudrate; 160 /* Round to nearest divisor */ 161 if (((rem * 2) >= baudrate) && (baudrate != 110)) 162 divisor++; 163 164 return divisor; 165 } 166 167 static inline int qt2_set_port_config(struct usb_device *dev, 168 unsigned char port_number, 169 u16 baudrate, u16 lcr) 170 { 171 int divisor = calc_baud_divisor(baudrate); 172 u16 index = ((u16) (lcr << 8) | (u16) (port_number)); 173 174 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), 175 QT2_GET_SET_UART, 0x40, 176 divisor, index, NULL, 0, QT2_USB_TIMEOUT); 177 } 178 179 static inline int qt2_control_msg(struct usb_device *dev, 180 u8 request, u16 data, u16 index) 181 { 182 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), 183 request, 0x40, data, index, 184 NULL, 0, QT2_USB_TIMEOUT); 185 } 186 187 static inline int qt2_setdevice(struct usb_device *dev, u8 *data) 188 { 189 u16 x = ((u16) (data[1] << 8) | (u16) (data[0])); 190 191 return qt2_control_msg(dev, QT_SET_GET_DEVICE, x, 0); 192 } 193 194 195 static inline int qt2_getdevice(struct usb_device *dev, u8 *data) 196 { 197 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), 198 QT_SET_GET_DEVICE, 0xc0, 0, 0, 199 data, 3, QT2_USB_TIMEOUT); 200 } 201 202 static inline int qt2_getregister(struct usb_device *dev, 203 u8 uart, 204 u8 reg, 205 u8 *data) 206 { 207 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), 208 QT_SET_GET_REGISTER, 0xc0, reg, 209 uart, data, sizeof(*data), QT2_USB_TIMEOUT); 210 211 } 212 213 static inline int qt2_setregister(struct usb_device *dev, 214 u8 uart, u8 reg, u16 data) 215 { 216 u16 value = (data << 8) | reg; 217 218 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), 219 QT_SET_GET_REGISTER, 0x40, value, uart, 220 NULL, 0, QT2_USB_TIMEOUT); 221 } 222 223 static inline int update_mctrl(struct qt2_port_private *port_priv, 224 unsigned int set, unsigned int clear) 225 { 226 struct usb_serial_port *port = port_priv->port; 227 struct usb_device *dev = port->serial->dev; 228 unsigned urb_value; 229 int status; 230 231 if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0) { 232 dev_dbg(&port->dev, 233 "update_mctrl - DTR|RTS not being set|cleared\n"); 234 return 0; /* no change */ 235 } 236 237 clear &= ~set; /* 'set' takes precedence over 'clear' */ 238 urb_value = 0; 239 if (set & TIOCM_DTR) 240 urb_value |= UART_MCR_DTR; 241 if (set & TIOCM_RTS) 242 urb_value |= UART_MCR_RTS; 243 244 status = qt2_setregister(dev, port_priv->device_port, UART_MCR, 245 urb_value); 246 if (status < 0) 247 dev_err(&port->dev, 248 "update_mctrl - Error from MODEM_CTRL urb: %i\n", 249 status); 250 return status; 251 } 252 253 static int qt2_calc_num_ports(struct usb_serial *serial) 254 { 255 struct qt2_device_detail d; 256 int i; 257 258 for (i = 0; d = qt2_device_details[i], d.product_id != 0; i++) { 259 if (d.product_id == le16_to_cpu(serial->dev->descriptor.idProduct)) 260 return d.num_ports; 261 } 262 263 /* we didn't recognize the device */ 264 dev_err(&serial->dev->dev, 265 "don't know the number of ports, assuming 1\n"); 266 267 return 1; 268 } 269 270 static void qt2_set_termios(struct tty_struct *tty, 271 struct usb_serial_port *port, 272 struct ktermios *old_termios) 273 { 274 struct usb_device *dev = port->serial->dev; 275 struct qt2_port_private *port_priv; 276 struct ktermios *termios = &tty->termios; 277 u16 baud; 278 unsigned int cflag = termios->c_cflag; 279 u16 new_lcr = 0; 280 int status; 281 282 port_priv = usb_get_serial_port_data(port); 283 284 if (cflag & PARENB) { 285 if (cflag & PARODD) 286 new_lcr |= UART_LCR_PARITY; 287 else 288 new_lcr |= SERIAL_EVEN_PARITY; 289 } 290 291 switch (cflag & CSIZE) { 292 case CS5: 293 new_lcr |= UART_LCR_WLEN5; 294 break; 295 case CS6: 296 new_lcr |= UART_LCR_WLEN6; 297 break; 298 case CS7: 299 new_lcr |= UART_LCR_WLEN7; 300 break; 301 default: 302 case CS8: 303 new_lcr |= UART_LCR_WLEN8; 304 break; 305 } 306 307 baud = tty_get_baud_rate(tty); 308 if (!baud) 309 baud = 9600; 310 311 status = qt2_set_port_config(dev, port_priv->device_port, baud, 312 new_lcr); 313 if (status < 0) 314 dev_err(&port->dev, "%s - qt2_set_port_config failed: %i\n", 315 __func__, status); 316 317 if (cflag & CRTSCTS) 318 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK, 319 SERIAL_CRTSCTS, 320 port_priv->device_port); 321 else 322 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK, 323 0, port_priv->device_port); 324 if (status < 0) 325 dev_err(&port->dev, "%s - set HW flow control failed: %i\n", 326 __func__, status); 327 328 if (I_IXOFF(tty) || I_IXON(tty)) { 329 u16 x = ((u16) (START_CHAR(tty) << 8) | (u16) (STOP_CHAR(tty))); 330 331 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK, 332 x, port_priv->device_port); 333 } else 334 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK, 335 0, port_priv->device_port); 336 337 if (status < 0) 338 dev_err(&port->dev, "%s - set SW flow control failed: %i\n", 339 __func__, status); 340 341 } 342 343 static int qt2_open(struct tty_struct *tty, struct usb_serial_port *port) 344 { 345 struct usb_serial *serial; 346 struct qt2_port_private *port_priv; 347 u8 *data; 348 u16 device_port; 349 int status; 350 unsigned long flags; 351 352 device_port = (u16) (port->number - port->serial->minor); 353 354 serial = port->serial; 355 356 port_priv = usb_get_serial_port_data(port); 357 358 /* set the port to RS232 mode */ 359 status = qt2_control_msg(serial->dev, QT2_GET_SET_QMCR, 360 QT2_QMCR_RS232, device_port); 361 if (status < 0) { 362 dev_err(&port->dev, 363 "%s failed to set RS232 mode for port %i error %i\n", 364 __func__, device_port, status); 365 return status; 366 } 367 368 data = kzalloc(2, GFP_KERNEL); 369 if (!data) 370 return -ENOMEM; 371 372 /* open the port */ 373 status = usb_control_msg(serial->dev, 374 usb_rcvctrlpipe(serial->dev, 0), 375 QT_OPEN_CLOSE_CHANNEL, 376 0xc0, 0, 377 device_port, data, 2, QT2_USB_TIMEOUT); 378 379 if (status < 0) { 380 dev_err(&port->dev, "%s - open port failed %i", __func__, 381 status); 382 kfree(data); 383 return status; 384 } 385 386 spin_lock_irqsave(&port_priv->lock, flags); 387 port_priv->shadowLSR = data[0]; 388 port_priv->shadowMSR = data[1]; 389 spin_unlock_irqrestore(&port_priv->lock, flags); 390 391 kfree(data); 392 393 /* set to default speed and 8bit word size */ 394 status = qt2_set_port_config(serial->dev, device_port, 395 DEFAULT_BAUD_RATE, UART_LCR_WLEN8); 396 if (status < 0) { 397 dev_err(&port->dev, 398 "%s - initial setup failed for port %i (%i)\n", 399 __func__, port->number, device_port); 400 return status; 401 } 402 403 port_priv->is_open = true; 404 port_priv->device_port = (u8) device_port; 405 406 if (tty) 407 qt2_set_termios(tty, port, &tty->termios); 408 409 return 0; 410 411 } 412 413 static void qt2_close(struct usb_serial_port *port) 414 { 415 struct usb_serial *serial; 416 struct qt2_port_private *port_priv; 417 unsigned long flags; 418 int i; 419 420 serial = port->serial; 421 port_priv = usb_get_serial_port_data(port); 422 423 port_priv->is_open = false; 424 425 spin_lock_irqsave(&port_priv->urb_lock, flags); 426 usb_kill_urb(port_priv->write_urb); 427 port_priv->urb_in_use = false; 428 spin_unlock_irqrestore(&port_priv->urb_lock, flags); 429 430 mutex_lock(&port->serial->disc_mutex); 431 if (port->serial->disconnected) { 432 mutex_unlock(&port->serial->disc_mutex); 433 return; 434 } 435 436 /* flush the port transmit buffer */ 437 i = usb_control_msg(serial->dev, 438 usb_rcvctrlpipe(serial->dev, 0), 439 QT2_FLUSH_DEVICE, 0x40, 1, 440 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT); 441 442 if (i < 0) 443 dev_err(&port->dev, "%s - transmit buffer flush failed: %i\n", 444 __func__, i); 445 446 /* flush the port receive buffer */ 447 i = usb_control_msg(serial->dev, 448 usb_rcvctrlpipe(serial->dev, 0), 449 QT2_FLUSH_DEVICE, 0x40, 0, 450 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT); 451 452 if (i < 0) 453 dev_err(&port->dev, "%s - receive buffer flush failed: %i\n", 454 __func__, i); 455 456 /* close the port */ 457 i = usb_control_msg(serial->dev, 458 usb_sndctrlpipe(serial->dev, 0), 459 QT_OPEN_CLOSE_CHANNEL, 460 0x40, 0, 461 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT); 462 463 if (i < 0) 464 dev_err(&port->dev, "%s - close port failed %i\n", 465 __func__, i); 466 467 mutex_unlock(&port->serial->disc_mutex); 468 } 469 470 static void qt2_disconnect(struct usb_serial *serial) 471 { 472 struct qt2_serial_private *serial_priv = usb_get_serial_data(serial); 473 474 usb_kill_urb(serial_priv->read_urb); 475 } 476 477 static int get_serial_info(struct usb_serial_port *port, 478 struct serial_struct __user *retinfo) 479 { 480 struct serial_struct tmp; 481 482 if (!retinfo) 483 return -EFAULT; 484 485 memset(&tmp, 0, sizeof(tmp)); 486 tmp.line = port->serial->minor; 487 tmp.port = 0; 488 tmp.irq = 0; 489 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ; 490 tmp.xmit_fifo_size = port->bulk_out_size; 491 tmp.baud_base = 9600; 492 tmp.close_delay = 5*HZ; 493 tmp.closing_wait = 30*HZ; 494 495 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) 496 return -EFAULT; 497 return 0; 498 } 499 500 static int wait_modem_info(struct usb_serial_port *port, unsigned int arg) 501 { 502 struct qt2_port_private *priv = usb_get_serial_port_data(port); 503 struct async_icount prev, cur; 504 unsigned long flags; 505 506 spin_lock_irqsave(&priv->lock, flags); 507 prev = priv->icount; 508 spin_unlock_irqrestore(&priv->lock, flags); 509 510 while (1) { 511 wait_event_interruptible(priv->delta_msr_wait, 512 ((priv->icount.rng != prev.rng) || 513 (priv->icount.dsr != prev.dsr) || 514 (priv->icount.dcd != prev.dcd) || 515 (priv->icount.cts != prev.cts))); 516 517 if (signal_pending(current)) 518 return -ERESTARTSYS; 519 520 spin_lock_irqsave(&priv->lock, flags); 521 cur = priv->icount; 522 spin_unlock_irqrestore(&priv->lock, flags); 523 524 if ((prev.rng == cur.rng) && 525 (prev.dsr == cur.dsr) && 526 (prev.dcd == cur.dcd) && 527 (prev.cts == cur.cts)) 528 return -EIO; 529 530 if ((arg & TIOCM_RNG && (prev.rng != cur.rng)) || 531 (arg & TIOCM_DSR && (prev.dsr != cur.dsr)) || 532 (arg & TIOCM_CD && (prev.dcd != cur.dcd)) || 533 (arg & TIOCM_CTS && (prev.cts != cur.cts))) 534 return 0; 535 } 536 return 0; 537 } 538 539 static int qt2_get_icount(struct tty_struct *tty, 540 struct serial_icounter_struct *icount) 541 { 542 struct usb_serial_port *port = tty->driver_data; 543 struct qt2_port_private *priv = usb_get_serial_port_data(port); 544 struct async_icount cnow = priv->icount; 545 546 icount->cts = cnow.cts; 547 icount->dsr = cnow.dsr; 548 icount->rng = cnow.rng; 549 icount->dcd = cnow.dcd; 550 icount->rx = cnow.rx; 551 icount->tx = cnow.tx; 552 icount->frame = cnow.frame; 553 icount->overrun = cnow.overrun; 554 icount->parity = cnow.parity; 555 icount->brk = cnow.brk; 556 icount->buf_overrun = cnow.buf_overrun; 557 558 return 0; 559 } 560 561 static int qt2_ioctl(struct tty_struct *tty, 562 unsigned int cmd, unsigned long arg) 563 { 564 struct usb_serial_port *port = tty->driver_data; 565 566 switch (cmd) { 567 case TIOCGSERIAL: 568 return get_serial_info(port, 569 (struct serial_struct __user *)arg); 570 571 case TIOCMIWAIT: 572 return wait_modem_info(port, arg); 573 574 default: 575 break; 576 } 577 578 return -ENOIOCTLCMD; 579 } 580 581 static void qt2_process_status(struct usb_serial_port *port, unsigned char *ch) 582 { 583 switch (*ch) { 584 case QT2_LINE_STATUS: 585 qt2_update_lsr(port, ch + 1); 586 break; 587 case QT2_MODEM_STATUS: 588 qt2_update_msr(port, ch + 1); 589 break; 590 } 591 } 592 593 /* not needed, kept to document functionality */ 594 static void qt2_process_xmit_empty(struct usb_serial_port *port, 595 unsigned char *ch) 596 { 597 int bytes_written; 598 599 bytes_written = (int)(*ch) + (int)(*(ch + 1) << 4); 600 } 601 602 /* not needed, kept to document functionality */ 603 static void qt2_process_flush(struct usb_serial_port *port, unsigned char *ch) 604 { 605 return; 606 } 607 608 void qt2_process_read_urb(struct urb *urb) 609 { 610 struct usb_serial *serial; 611 struct qt2_serial_private *serial_priv; 612 struct usb_serial_port *port; 613 struct qt2_port_private *port_priv; 614 struct tty_struct *tty; 615 bool escapeflag; 616 unsigned char *ch; 617 int i; 618 unsigned char newport; 619 int len = urb->actual_length; 620 621 if (!len) 622 return; 623 624 ch = urb->transfer_buffer; 625 tty = NULL; 626 serial = urb->context; 627 serial_priv = usb_get_serial_data(serial); 628 port = serial->port[serial_priv->current_port]; 629 port_priv = usb_get_serial_port_data(port); 630 631 if (port_priv->is_open) 632 tty = tty_port_tty_get(&port->port); 633 634 for (i = 0; i < urb->actual_length; i++) { 635 ch = (unsigned char *)urb->transfer_buffer + i; 636 if ((i <= (len - 3)) && 637 (*ch == QT2_CONTROL_BYTE) && 638 (*(ch + 1) == QT2_CONTROL_BYTE)) { 639 escapeflag = false; 640 switch (*(ch + 2)) { 641 case QT2_LINE_STATUS: 642 case QT2_MODEM_STATUS: 643 if (i > (len - 4)) { 644 dev_warn(&port->dev, 645 "%s - status message too short\n", 646 __func__); 647 break; 648 } 649 qt2_process_status(port, ch + 2); 650 i += 3; 651 escapeflag = true; 652 break; 653 case QT2_XMIT_HOLD: 654 if (i > (len - 5)) { 655 dev_warn(&port->dev, 656 "%s - xmit_empty message too short\n", 657 __func__); 658 break; 659 } 660 qt2_process_xmit_empty(port, ch + 3); 661 i += 4; 662 escapeflag = true; 663 break; 664 case QT2_CHANGE_PORT: 665 if (i > (len - 4)) { 666 dev_warn(&port->dev, 667 "%s - change_port message too short\n", 668 __func__); 669 break; 670 } 671 if (tty) { 672 tty_flip_buffer_push(tty); 673 tty_kref_put(tty); 674 } 675 676 newport = *(ch + 3); 677 678 if (newport > serial->num_ports) { 679 dev_err(&port->dev, 680 "%s - port change to invalid port: %i\n", 681 __func__, newport); 682 break; 683 } 684 685 serial_priv->current_port = newport; 686 port = serial->port[serial_priv->current_port]; 687 port_priv = usb_get_serial_port_data(port); 688 if (port_priv->is_open) 689 tty = tty_port_tty_get(&port->port); 690 else 691 tty = NULL; 692 i += 3; 693 escapeflag = true; 694 break; 695 case QT2_REC_FLUSH: 696 case QT2_XMIT_FLUSH: 697 qt2_process_flush(port, ch + 2); 698 i += 2; 699 escapeflag = true; 700 break; 701 case QT2_CONTROL_ESCAPE: 702 tty_buffer_request_room(tty, 2); 703 tty_insert_flip_string(tty, ch, 2); 704 i += 2; 705 escapeflag = true; 706 break; 707 default: 708 dev_warn(&port->dev, 709 "%s - unsupported command %i\n", 710 __func__, *(ch + 2)); 711 break; 712 } 713 if (escapeflag) 714 continue; 715 } 716 717 if (tty) { 718 tty_buffer_request_room(tty, 1); 719 tty_insert_flip_string(tty, ch, 1); 720 } 721 } 722 723 if (tty) { 724 tty_flip_buffer_push(tty); 725 tty_kref_put(tty); 726 } 727 } 728 729 static void qt2_write_bulk_callback(struct urb *urb) 730 { 731 struct usb_serial_port *port; 732 struct qt2_port_private *port_priv; 733 734 port = urb->context; 735 port_priv = usb_get_serial_port_data(port); 736 737 spin_lock(&port_priv->urb_lock); 738 739 port_priv->urb_in_use = false; 740 usb_serial_port_softint(port); 741 742 spin_unlock(&port_priv->urb_lock); 743 744 } 745 746 static void qt2_read_bulk_callback(struct urb *urb) 747 { 748 struct usb_serial *serial = urb->context; 749 int status; 750 751 if (urb->status) { 752 dev_warn(&serial->dev->dev, 753 "%s - non-zero urb status: %i\n", __func__, 754 urb->status); 755 return; 756 } 757 758 qt2_process_read_urb(urb); 759 760 status = usb_submit_urb(urb, GFP_ATOMIC); 761 if (status != 0) 762 dev_err(&serial->dev->dev, 763 "%s - resubmit read urb failed: %i\n", 764 __func__, status); 765 } 766 767 static int qt2_setup_urbs(struct usb_serial *serial) 768 { 769 struct usb_serial_port *port0; 770 struct qt2_serial_private *serial_priv; 771 int status; 772 773 port0 = serial->port[0]; 774 775 serial_priv = usb_get_serial_data(serial); 776 serial_priv->read_urb = usb_alloc_urb(0, GFP_KERNEL); 777 if (!serial_priv->read_urb) { 778 dev_err(&serial->dev->dev, "No free urbs available\n"); 779 return -ENOMEM; 780 } 781 782 usb_fill_bulk_urb(serial_priv->read_urb, serial->dev, 783 usb_rcvbulkpipe(serial->dev, 784 port0->bulk_in_endpointAddress), 785 serial_priv->read_buffer, 786 sizeof(serial_priv->read_buffer), 787 qt2_read_bulk_callback, serial); 788 789 status = usb_submit_urb(serial_priv->read_urb, GFP_KERNEL); 790 if (status != 0) { 791 dev_err(&serial->dev->dev, 792 "%s - submit read urb failed %i\n", __func__, status); 793 usb_free_urb(serial_priv->read_urb); 794 return status; 795 } 796 797 return 0; 798 } 799 800 static int qt2_attach(struct usb_serial *serial) 801 { 802 struct qt2_serial_private *serial_priv; 803 int status; 804 805 /* power on unit */ 806 status = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 807 0xc2, 0x40, 0x8000, 0, NULL, 0, 808 QT2_USB_TIMEOUT); 809 if (status < 0) { 810 dev_err(&serial->dev->dev, 811 "%s - failed to power on unit: %i\n", __func__, status); 812 return status; 813 } 814 815 serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL); 816 if (!serial_priv) { 817 dev_err(&serial->dev->dev, "%s - Out of memory\n", __func__); 818 return -ENOMEM; 819 } 820 821 usb_set_serial_data(serial, serial_priv); 822 823 status = qt2_setup_urbs(serial); 824 if (status != 0) 825 goto attach_failed; 826 827 return 0; 828 829 attach_failed: 830 kfree(serial_priv); 831 return status; 832 } 833 834 static int qt2_port_probe(struct usb_serial_port *port) 835 { 836 struct usb_serial *serial = port->serial; 837 struct qt2_port_private *port_priv; 838 u8 bEndpointAddress; 839 840 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL); 841 if (!port_priv) 842 return -ENOMEM; 843 844 spin_lock_init(&port_priv->lock); 845 spin_lock_init(&port_priv->urb_lock); 846 init_waitqueue_head(&port_priv->delta_msr_wait); 847 port_priv->port = port; 848 849 port_priv->write_urb = usb_alloc_urb(0, GFP_KERNEL); 850 if (!port_priv->write_urb) { 851 kfree(port_priv); 852 return -ENOMEM; 853 } 854 bEndpointAddress = serial->port[0]->bulk_out_endpointAddress; 855 usb_fill_bulk_urb(port_priv->write_urb, serial->dev, 856 usb_sndbulkpipe(serial->dev, bEndpointAddress), 857 port_priv->write_buffer, 858 sizeof(port_priv->write_buffer), 859 qt2_write_bulk_callback, port); 860 861 usb_set_serial_port_data(port, port_priv); 862 863 return 0; 864 } 865 866 static int qt2_port_remove(struct usb_serial_port *port) 867 { 868 struct qt2_port_private *port_priv; 869 870 port_priv = usb_get_serial_port_data(port); 871 usb_free_urb(port_priv->write_urb); 872 kfree(port_priv); 873 874 return 0; 875 } 876 877 static int qt2_tiocmget(struct tty_struct *tty) 878 { 879 struct usb_serial_port *port = tty->driver_data; 880 struct usb_device *dev = port->serial->dev; 881 struct qt2_port_private *port_priv = usb_get_serial_port_data(port); 882 u8 *d; 883 int r; 884 885 d = kzalloc(2, GFP_KERNEL); 886 if (!d) 887 return -ENOMEM; 888 889 r = qt2_getregister(dev, port_priv->device_port, UART_MCR, d); 890 if (r < 0) 891 goto mget_out; 892 893 r = qt2_getregister(dev, port_priv->device_port, UART_MSR, d + 1); 894 if (r < 0) 895 goto mget_out; 896 897 r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) | 898 (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) | 899 (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) | 900 (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) | 901 (d[1] & UART_MSR_RI ? TIOCM_RI : 0) | 902 (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0); 903 904 mget_out: 905 kfree(d); 906 return r; 907 } 908 909 static int qt2_tiocmset(struct tty_struct *tty, 910 unsigned int set, unsigned int clear) 911 { 912 struct qt2_port_private *port_priv; 913 914 port_priv = usb_get_serial_port_data(tty->driver_data); 915 return update_mctrl(port_priv, set, clear); 916 } 917 918 static void qt2_break_ctl(struct tty_struct *tty, int break_state) 919 { 920 struct usb_serial_port *port = tty->driver_data; 921 struct qt2_port_private *port_priv; 922 int status; 923 u16 val; 924 925 port_priv = usb_get_serial_port_data(port); 926 927 if (!port_priv->is_open) { 928 dev_err(&port->dev, 929 "%s - port is not open\n", __func__); 930 return; 931 } 932 933 val = (break_state == -1) ? 1 : 0; 934 935 status = qt2_control_msg(port->serial->dev, QT2_BREAK_CONTROL, 936 val, port_priv->device_port); 937 if (status < 0) 938 dev_warn(&port->dev, 939 "%s - failed to send control message: %i\n", __func__, 940 status); 941 } 942 943 944 945 static void qt2_dtr_rts(struct usb_serial_port *port, int on) 946 { 947 struct usb_device *dev = port->serial->dev; 948 struct qt2_port_private *port_priv = usb_get_serial_port_data(port); 949 950 mutex_lock(&port->serial->disc_mutex); 951 if (!port->serial->disconnected) { 952 /* Disable flow control */ 953 if (!on && qt2_setregister(dev, port_priv->device_port, 954 UART_MCR, 0) < 0) 955 dev_warn(&port->dev, "error from flowcontrol urb\n"); 956 /* drop RTS and DTR */ 957 if (on) 958 update_mctrl(port_priv, TIOCM_DTR | TIOCM_RTS, 0); 959 else 960 update_mctrl(port_priv, 0, TIOCM_DTR | TIOCM_RTS); 961 } 962 mutex_unlock(&port->serial->disc_mutex); 963 } 964 965 static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch) 966 { 967 struct qt2_port_private *port_priv; 968 u8 newMSR = (u8) *ch; 969 unsigned long flags; 970 971 port_priv = usb_get_serial_port_data(port); 972 973 spin_lock_irqsave(&port_priv->lock, flags); 974 port_priv->shadowMSR = newMSR; 975 spin_unlock_irqrestore(&port_priv->lock, flags); 976 977 if (newMSR & UART_MSR_ANY_DELTA) { 978 /* update input line counters */ 979 if (newMSR & UART_MSR_DCTS) 980 port_priv->icount.cts++; 981 982 if (newMSR & UART_MSR_DDSR) 983 port_priv->icount.dsr++; 984 985 if (newMSR & UART_MSR_DDCD) 986 port_priv->icount.dcd++; 987 988 if (newMSR & UART_MSR_TERI) 989 port_priv->icount.rng++; 990 991 wake_up_interruptible(&port_priv->delta_msr_wait); 992 } 993 } 994 995 static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch) 996 { 997 struct qt2_port_private *port_priv; 998 struct async_icount *icount; 999 unsigned long flags; 1000 u8 newLSR = (u8) *ch; 1001 1002 port_priv = usb_get_serial_port_data(port); 1003 1004 if (newLSR & UART_LSR_BI) 1005 newLSR &= (u8) (UART_LSR_OE | UART_LSR_BI); 1006 1007 spin_lock_irqsave(&port_priv->lock, flags); 1008 port_priv->shadowLSR = newLSR; 1009 spin_unlock_irqrestore(&port_priv->lock, flags); 1010 1011 icount = &port_priv->icount; 1012 1013 if (newLSR & UART_LSR_BRK_ERROR_BITS) { 1014 1015 if (newLSR & UART_LSR_BI) 1016 icount->brk++; 1017 1018 if (newLSR & UART_LSR_OE) 1019 icount->overrun++; 1020 1021 if (newLSR & UART_LSR_PE) 1022 icount->parity++; 1023 1024 if (newLSR & UART_LSR_FE) 1025 icount->frame++; 1026 } 1027 1028 } 1029 1030 static int qt2_write_room(struct tty_struct *tty) 1031 { 1032 struct usb_serial_port *port = tty->driver_data; 1033 struct qt2_port_private *port_priv; 1034 unsigned long flags = 0; 1035 int r; 1036 1037 port_priv = usb_get_serial_port_data(port); 1038 1039 spin_lock_irqsave(&port_priv->urb_lock, flags); 1040 1041 if (port_priv->urb_in_use) 1042 r = 0; 1043 else 1044 r = QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE; 1045 1046 spin_unlock_irqrestore(&port_priv->urb_lock, flags); 1047 1048 return r; 1049 } 1050 1051 static int qt2_write(struct tty_struct *tty, 1052 struct usb_serial_port *port, 1053 const unsigned char *buf, int count) 1054 { 1055 struct qt2_port_private *port_priv; 1056 struct urb *write_urb; 1057 unsigned char *data; 1058 unsigned long flags; 1059 int status; 1060 int bytes_out = 0; 1061 1062 port_priv = usb_get_serial_port_data(port); 1063 1064 if (port_priv->write_urb == NULL) { 1065 dev_err(&port->dev, "%s - no output urb\n", __func__); 1066 return 0; 1067 } 1068 write_urb = port_priv->write_urb; 1069 1070 count = min(count, QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE); 1071 1072 data = write_urb->transfer_buffer; 1073 spin_lock_irqsave(&port_priv->urb_lock, flags); 1074 if (port_priv->urb_in_use == true) { 1075 dev_err(&port->dev, "qt2_write - urb is in use\n"); 1076 goto write_out; 1077 } 1078 1079 *data++ = QT2_CONTROL_BYTE; 1080 *data++ = QT2_CONTROL_BYTE; 1081 *data++ = port_priv->device_port; 1082 put_unaligned_le16(count, data); 1083 data += 2; 1084 memcpy(data, buf, count); 1085 1086 write_urb->transfer_buffer_length = count + QT2_WRITE_CONTROL_SIZE; 1087 1088 status = usb_submit_urb(write_urb, GFP_ATOMIC); 1089 if (status == 0) { 1090 port_priv->urb_in_use = true; 1091 bytes_out += count; 1092 } 1093 1094 write_out: 1095 spin_unlock_irqrestore(&port_priv->urb_lock, flags); 1096 return bytes_out; 1097 } 1098 1099 1100 static struct usb_serial_driver qt2_device = { 1101 .driver = { 1102 .owner = THIS_MODULE, 1103 .name = "quatech-serial", 1104 }, 1105 .description = DRIVER_DESC, 1106 .id_table = id_table, 1107 .open = qt2_open, 1108 .close = qt2_close, 1109 .write = qt2_write, 1110 .write_room = qt2_write_room, 1111 .calc_num_ports = qt2_calc_num_ports, 1112 .attach = qt2_attach, 1113 .release = qt2_release, 1114 .disconnect = qt2_disconnect, 1115 .port_probe = qt2_port_probe, 1116 .port_remove = qt2_port_remove, 1117 .dtr_rts = qt2_dtr_rts, 1118 .break_ctl = qt2_break_ctl, 1119 .tiocmget = qt2_tiocmget, 1120 .tiocmset = qt2_tiocmset, 1121 .get_icount = qt2_get_icount, 1122 .ioctl = qt2_ioctl, 1123 .set_termios = qt2_set_termios, 1124 }; 1125 1126 static struct usb_serial_driver *const serial_drivers[] = { 1127 &qt2_device, NULL 1128 }; 1129 1130 module_usb_serial_driver(serial_drivers, id_table); 1131 1132 MODULE_DESCRIPTION(DRIVER_DESC); 1133 MODULE_LICENSE("GPL"); 1134