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 static bool debug; 31 32 /* default urb timeout for usb operations */ 33 #define QT2_USB_TIMEOUT USB_CTRL_SET_TIMEOUT 34 35 #define QT_OPEN_CLOSE_CHANNEL 0xca 36 #define QT_SET_GET_DEVICE 0xc2 37 #define QT_SET_GET_REGISTER 0xc0 38 #define QT_GET_SET_PREBUF_TRIG_LVL 0xcc 39 #define QT_SET_ATF 0xcd 40 #define QT_TRANSFER_IN 0xc0 41 #define QT_HW_FLOW_CONTROL_MASK 0xc5 42 #define QT_SW_FLOW_CONTROL_MASK 0xc6 43 #define QT2_BREAK_CONTROL 0xc8 44 #define QT2_GET_SET_UART 0xc1 45 #define QT2_FLUSH_DEVICE 0xc4 46 #define QT2_GET_SET_QMCR 0xe1 47 #define QT2_QMCR_RS232 0x40 48 #define QT2_QMCR_RS422 0x10 49 50 #define SERIAL_CRTSCTS ((UART_MCR_RTS << 8) | UART_MSR_CTS) 51 52 #define SERIAL_EVEN_PARITY (UART_LCR_PARITY | UART_LCR_EPAR) 53 54 /* status bytes for the device */ 55 #define QT2_CONTROL_BYTE 0x1b 56 #define QT2_LINE_STATUS 0x00 /* following 1 byte is line status */ 57 #define QT2_MODEM_STATUS 0x01 /* following 1 byte is modem status */ 58 #define QT2_XMIT_HOLD 0x02 /* following 2 bytes are ?? */ 59 #define QT2_CHANGE_PORT 0x03 /* following 1 byte is port to change to */ 60 #define QT2_REC_FLUSH 0x04 /* no following info */ 61 #define QT2_XMIT_FLUSH 0x05 /* no following info */ 62 #define QT2_CONTROL_ESCAPE 0xff /* pass through previous 2 control bytes */ 63 64 #define MAX_BAUD_RATE 921600 65 #define DEFAULT_BAUD_RATE 9600 66 67 #define QT2_WRITE_BUFFER_SIZE 512 /* size of write buffer */ 68 #define QT2_WRITE_CONTROL_SIZE 5 /* control bytes used for a write */ 69 70 /* Version Information */ 71 #define DRIVER_VERSION "v0.1" 72 #define DRIVER_DESC "Quatech 2nd gen USB to Serial Driver" 73 74 #define USB_VENDOR_ID_QUATECH 0x061d 75 #define QUATECH_SSU2_100 0xC120 /* RS232 single port */ 76 #define QUATECH_DSU2_100 0xC140 /* RS232 dual port */ 77 #define QUATECH_DSU2_400 0xC150 /* RS232/422/485 dual port */ 78 #define QUATECH_QSU2_100 0xC160 /* RS232 four port */ 79 #define QUATECH_QSU2_400 0xC170 /* RS232/422/485 four port */ 80 #define QUATECH_ESU2_100 0xC1A0 /* RS232 eight port */ 81 #define QUATECH_ESU2_400 0xC180 /* RS232/422/485 eight port */ 82 83 struct qt2_device_detail { 84 int product_id; 85 int num_ports; 86 }; 87 88 #define QT_DETAILS(prod, ports) \ 89 .product_id = (prod), \ 90 .num_ports = (ports) 91 92 static const struct qt2_device_detail qt2_device_details[] = { 93 {QT_DETAILS(QUATECH_SSU2_100, 1)}, 94 {QT_DETAILS(QUATECH_DSU2_400, 2)}, 95 {QT_DETAILS(QUATECH_DSU2_100, 2)}, 96 {QT_DETAILS(QUATECH_QSU2_400, 4)}, 97 {QT_DETAILS(QUATECH_QSU2_100, 4)}, 98 {QT_DETAILS(QUATECH_ESU2_400, 8)}, 99 {QT_DETAILS(QUATECH_ESU2_100, 8)}, 100 {QT_DETAILS(0, 0)} /* Terminating entry */ 101 }; 102 103 static const struct usb_device_id id_table[] = { 104 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_SSU2_100)}, 105 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU2_100)}, 106 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU2_400)}, 107 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU2_100)}, 108 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU2_400)}, 109 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU2_100)}, 110 {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU2_400)}, 111 {} /* Terminating entry */ 112 }; 113 MODULE_DEVICE_TABLE(usb, id_table); 114 115 struct qt2_serial_private { 116 unsigned char current_port; /* current port for incoming data */ 117 118 struct urb *read_urb; /* shared among all ports */ 119 char read_buffer[512]; 120 }; 121 122 struct qt2_port_private { 123 bool is_open; 124 u8 device_port; 125 126 spinlock_t urb_lock; 127 bool urb_in_use; 128 struct urb *write_urb; 129 char write_buffer[QT2_WRITE_BUFFER_SIZE]; 130 131 spinlock_t lock; 132 u8 shadowLSR; 133 u8 shadowMSR; 134 135 wait_queue_head_t delta_msr_wait; /* Used for TIOCMIWAIT */ 136 struct async_icount icount; 137 138 struct usb_serial_port *port; 139 }; 140 141 static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch); 142 static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch); 143 static void qt2_write_bulk_callback(struct urb *urb); 144 static void qt2_read_bulk_callback(struct urb *urb); 145 146 static void qt2_release(struct usb_serial *serial) 147 { 148 int i; 149 150 kfree(usb_get_serial_data(serial)); 151 152 for (i = 0; i < serial->num_ports; i++) 153 kfree(usb_get_serial_port_data(serial->port[i])); 154 } 155 156 static inline int calc_baud_divisor(int baudrate) 157 { 158 int divisor, rem; 159 160 divisor = MAX_BAUD_RATE / baudrate; 161 rem = MAX_BAUD_RATE % baudrate; 162 /* Round to nearest divisor */ 163 if (((rem * 2) >= baudrate) && (baudrate != 110)) 164 divisor++; 165 166 return divisor; 167 } 168 169 static inline int qt2_set_port_config(struct usb_device *dev, 170 unsigned char port_number, 171 u16 baudrate, u16 lcr) 172 { 173 int divisor = calc_baud_divisor(baudrate); 174 u16 index = ((u16) (lcr << 8) | (u16) (port_number)); 175 176 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), 177 QT2_GET_SET_UART, 0x40, 178 divisor, index, NULL, 0, QT2_USB_TIMEOUT); 179 } 180 181 static inline int qt2_control_msg(struct usb_device *dev, 182 u8 request, u16 data, u16 index) 183 { 184 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), 185 request, 0x40, data, index, 186 NULL, 0, QT2_USB_TIMEOUT); 187 } 188 189 static inline int qt2_setdevice(struct usb_device *dev, u8 *data) 190 { 191 u16 x = ((u16) (data[1] << 8) | (u16) (data[0])); 192 193 return qt2_control_msg(dev, QT_SET_GET_DEVICE, x, 0); 194 } 195 196 197 static inline int qt2_getdevice(struct usb_device *dev, u8 *data) 198 { 199 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), 200 QT_SET_GET_DEVICE, 0xc0, 0, 0, 201 data, 3, QT2_USB_TIMEOUT); 202 } 203 204 static inline int qt2_getregister(struct usb_device *dev, 205 u8 uart, 206 u8 reg, 207 u8 *data) 208 { 209 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), 210 QT_SET_GET_REGISTER, 0xc0, reg, 211 uart, data, sizeof(*data), QT2_USB_TIMEOUT); 212 213 } 214 215 static inline int qt2_setregister(struct usb_device *dev, 216 u8 uart, u8 reg, u16 data) 217 { 218 u16 value = (data << 8) | reg; 219 220 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), 221 QT_SET_GET_REGISTER, 0x40, value, uart, 222 NULL, 0, QT2_USB_TIMEOUT); 223 } 224 225 static inline int update_mctrl(struct qt2_port_private *port_priv, 226 unsigned int set, unsigned int clear) 227 { 228 struct usb_serial_port *port = port_priv->port; 229 struct usb_device *dev = port->serial->dev; 230 unsigned urb_value; 231 int status; 232 233 if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0) { 234 dev_dbg(&port->dev, 235 "update_mctrl - DTR|RTS not being set|cleared\n"); 236 return 0; /* no change */ 237 } 238 239 clear &= ~set; /* 'set' takes precedence over 'clear' */ 240 urb_value = 0; 241 if (set & TIOCM_DTR) 242 urb_value |= UART_MCR_DTR; 243 if (set & TIOCM_RTS) 244 urb_value |= UART_MCR_RTS; 245 246 status = qt2_setregister(dev, port_priv->device_port, UART_MCR, 247 urb_value); 248 if (status < 0) 249 dev_err(&port->dev, 250 "update_mctrl - Error from MODEM_CTRL urb: %i\n", 251 status); 252 return status; 253 } 254 255 static int qt2_calc_num_ports(struct usb_serial *serial) 256 { 257 struct qt2_device_detail d; 258 int i; 259 260 for (i = 0; d = qt2_device_details[i], d.product_id != 0; i++) { 261 if (d.product_id == le16_to_cpu(serial->dev->descriptor.idProduct)) 262 return d.num_ports; 263 } 264 265 /* we didn't recognize the device */ 266 dev_err(&serial->dev->dev, 267 "don't know the number of ports, assuming 1\n"); 268 269 return 1; 270 } 271 272 static void qt2_set_termios(struct tty_struct *tty, 273 struct usb_serial_port *port, 274 struct ktermios *old_termios) 275 { 276 struct usb_device *dev = port->serial->dev; 277 struct qt2_port_private *port_priv; 278 struct ktermios *termios = tty->termios; 279 u16 baud; 280 unsigned int cflag = termios->c_cflag; 281 u16 new_lcr = 0; 282 int status; 283 284 port_priv = usb_get_serial_port_data(port); 285 286 if (cflag & PARENB) { 287 if (cflag & PARODD) 288 new_lcr |= UART_LCR_PARITY; 289 else 290 new_lcr |= SERIAL_EVEN_PARITY; 291 } 292 293 switch (cflag & CSIZE) { 294 case CS5: 295 new_lcr |= UART_LCR_WLEN5; 296 break; 297 case CS6: 298 new_lcr |= UART_LCR_WLEN6; 299 break; 300 case CS7: 301 new_lcr |= UART_LCR_WLEN7; 302 break; 303 default: 304 case CS8: 305 new_lcr |= UART_LCR_WLEN8; 306 break; 307 } 308 309 baud = tty_get_baud_rate(tty); 310 if (!baud) 311 baud = 9600; 312 313 status = qt2_set_port_config(dev, port_priv->device_port, baud, 314 new_lcr); 315 if (status < 0) 316 dev_err(&port->dev, "%s - qt2_set_port_config failed: %i\n", 317 __func__, status); 318 319 if (cflag & CRTSCTS) 320 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK, 321 SERIAL_CRTSCTS, 322 port_priv->device_port); 323 else 324 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK, 325 0, port_priv->device_port); 326 if (status < 0) 327 dev_err(&port->dev, "%s - set HW flow control failed: %i\n", 328 __func__, status); 329 330 if (I_IXOFF(tty) || I_IXON(tty)) { 331 u16 x = ((u16) (START_CHAR(tty) << 8) | (u16) (STOP_CHAR(tty))); 332 333 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK, 334 x, port_priv->device_port); 335 } else 336 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK, 337 0, port_priv->device_port); 338 339 if (status < 0) 340 dev_err(&port->dev, "%s - set SW flow control failed: %i\n", 341 __func__, status); 342 343 } 344 345 static int qt2_open(struct tty_struct *tty, struct usb_serial_port *port) 346 { 347 struct usb_serial *serial; 348 struct qt2_port_private *port_priv; 349 u8 *data; 350 u16 device_port; 351 int status; 352 unsigned long flags; 353 354 device_port = (u16) (port->number - port->serial->minor); 355 356 serial = port->serial; 357 358 port_priv = usb_get_serial_port_data(port); 359 360 /* set the port to RS232 mode */ 361 status = qt2_control_msg(serial->dev, QT2_GET_SET_QMCR, 362 QT2_QMCR_RS232, device_port); 363 if (status < 0) { 364 dev_err(&port->dev, 365 "%s failed to set RS232 mode for port %i error %i\n", 366 __func__, device_port, status); 367 return status; 368 } 369 370 data = kzalloc(2, GFP_KERNEL); 371 if (!data) 372 return -ENOMEM; 373 374 /* open the port */ 375 status = usb_control_msg(serial->dev, 376 usb_rcvctrlpipe(serial->dev, 0), 377 QT_OPEN_CLOSE_CHANNEL, 378 0xc0, 0, 379 device_port, data, 2, QT2_USB_TIMEOUT); 380 381 if (status < 0) { 382 dev_err(&port->dev, "%s - open port failed %i", __func__, 383 status); 384 kfree(data); 385 return status; 386 } 387 388 spin_lock_irqsave(&port_priv->lock, flags); 389 port_priv->shadowLSR = data[0]; 390 port_priv->shadowMSR = data[1]; 391 spin_unlock_irqrestore(&port_priv->lock, flags); 392 393 kfree(data); 394 395 /* set to default speed and 8bit word size */ 396 status = qt2_set_port_config(serial->dev, device_port, 397 DEFAULT_BAUD_RATE, UART_LCR_WLEN8); 398 if (status < 0) { 399 dev_err(&port->dev, 400 "%s - initial setup failed for port %i (%i)\n", 401 __func__, port->number, device_port); 402 return status; 403 } 404 405 port_priv->is_open = true; 406 port_priv->device_port = (u8) device_port; 407 408 if (tty) 409 qt2_set_termios(tty, port, tty->termios); 410 411 return 0; 412 413 } 414 415 static void qt2_close(struct usb_serial_port *port) 416 { 417 struct usb_serial *serial; 418 struct qt2_port_private *port_priv; 419 unsigned long flags; 420 int i; 421 422 serial = port->serial; 423 port_priv = usb_get_serial_port_data(port); 424 425 port_priv->is_open = false; 426 427 spin_lock_irqsave(&port_priv->urb_lock, flags); 428 if (port_priv->write_urb->status == -EINPROGRESS) 429 usb_kill_urb(port_priv->write_urb); 430 port_priv->urb_in_use = false; 431 spin_unlock_irqrestore(&port_priv->urb_lock, flags); 432 433 /* flush the port transmit buffer */ 434 i = usb_control_msg(serial->dev, 435 usb_rcvctrlpipe(serial->dev, 0), 436 QT2_FLUSH_DEVICE, 0x40, 1, 437 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT); 438 439 if (i < 0) 440 dev_err(&port->dev, "%s - transmit buffer flush failed: %i\n", 441 __func__, i); 442 443 /* flush the port receive buffer */ 444 i = usb_control_msg(serial->dev, 445 usb_rcvctrlpipe(serial->dev, 0), 446 QT2_FLUSH_DEVICE, 0x40, 0, 447 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT); 448 449 if (i < 0) 450 dev_err(&port->dev, "%s - receive buffer flush failed: %i\n", 451 __func__, i); 452 453 /* close the port */ 454 i = usb_control_msg(serial->dev, 455 usb_sndctrlpipe(serial->dev, 0), 456 QT_OPEN_CLOSE_CHANNEL, 457 0x40, 0, 458 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT); 459 460 if (i < 0) 461 dev_err(&port->dev, "%s - close port failed %i\n", 462 __func__, i); 463 464 } 465 466 static void qt2_disconnect(struct usb_serial *serial) 467 { 468 struct qt2_serial_private *serial_priv = usb_get_serial_data(serial); 469 struct qt2_port_private *port_priv; 470 int i; 471 472 if (serial_priv->read_urb->status == -EINPROGRESS) 473 usb_kill_urb(serial_priv->read_urb); 474 475 usb_free_urb(serial_priv->read_urb); 476 477 for (i = 0; i < serial->num_ports; i++) { 478 port_priv = usb_get_serial_port_data(serial->port[i]); 479 480 if (port_priv->write_urb->status == -EINPROGRESS) 481 usb_kill_urb(port_priv->write_urb); 482 usb_free_urb(port_priv->write_urb); 483 } 484 } 485 486 static int get_serial_info(struct usb_serial_port *port, 487 struct serial_struct __user *retinfo) 488 { 489 struct serial_struct tmp; 490 491 if (!retinfo) 492 return -EFAULT; 493 494 memset(&tmp, 0, sizeof(tmp)); 495 tmp.line = port->serial->minor; 496 tmp.port = 0; 497 tmp.irq = 0; 498 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ; 499 tmp.xmit_fifo_size = port->bulk_out_size; 500 tmp.baud_base = 9600; 501 tmp.close_delay = 5*HZ; 502 tmp.closing_wait = 30*HZ; 503 504 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) 505 return -EFAULT; 506 return 0; 507 } 508 509 static int wait_modem_info(struct usb_serial_port *port, unsigned int arg) 510 { 511 struct qt2_port_private *priv = usb_get_serial_port_data(port); 512 struct async_icount prev, cur; 513 unsigned long flags; 514 515 spin_lock_irqsave(&priv->lock, flags); 516 prev = priv->icount; 517 spin_unlock_irqrestore(&priv->lock, flags); 518 519 while (1) { 520 wait_event_interruptible(priv->delta_msr_wait, 521 ((priv->icount.rng != prev.rng) || 522 (priv->icount.dsr != prev.dsr) || 523 (priv->icount.dcd != prev.dcd) || 524 (priv->icount.cts != prev.cts))); 525 526 if (signal_pending(current)) 527 return -ERESTARTSYS; 528 529 spin_lock_irqsave(&priv->lock, flags); 530 cur = priv->icount; 531 spin_unlock_irqrestore(&priv->lock, flags); 532 533 if ((prev.rng == cur.rng) && 534 (prev.dsr == cur.dsr) && 535 (prev.dcd == cur.dcd) && 536 (prev.cts == cur.cts)) 537 return -EIO; 538 539 if ((arg & TIOCM_RNG && (prev.rng != cur.rng)) || 540 (arg & TIOCM_DSR && (prev.dsr != cur.dsr)) || 541 (arg & TIOCM_CD && (prev.dcd != cur.dcd)) || 542 (arg & TIOCM_CTS && (prev.cts != cur.cts))) 543 return 0; 544 } 545 return 0; 546 } 547 548 static int qt2_get_icount(struct tty_struct *tty, 549 struct serial_icounter_struct *icount) 550 { 551 struct usb_serial_port *port = tty->driver_data; 552 struct qt2_port_private *priv = usb_get_serial_port_data(port); 553 struct async_icount cnow = priv->icount; 554 555 icount->cts = cnow.cts; 556 icount->dsr = cnow.dsr; 557 icount->rng = cnow.rng; 558 icount->dcd = cnow.dcd; 559 icount->rx = cnow.rx; 560 icount->tx = cnow.tx; 561 icount->frame = cnow.frame; 562 icount->overrun = cnow.overrun; 563 icount->parity = cnow.parity; 564 icount->brk = cnow.brk; 565 icount->buf_overrun = cnow.buf_overrun; 566 567 return 0; 568 } 569 570 static int qt2_ioctl(struct tty_struct *tty, 571 unsigned int cmd, unsigned long arg) 572 { 573 struct usb_serial_port *port = tty->driver_data; 574 575 switch (cmd) { 576 case TIOCGSERIAL: 577 return get_serial_info(port, 578 (struct serial_struct __user *)arg); 579 580 case TIOCMIWAIT: 581 return wait_modem_info(port, arg); 582 583 default: 584 break; 585 } 586 587 return -ENOIOCTLCMD; 588 } 589 590 static void qt2_process_status(struct usb_serial_port *port, unsigned char *ch) 591 { 592 switch (*ch) { 593 case QT2_LINE_STATUS: 594 qt2_update_lsr(port, ch + 1); 595 break; 596 case QT2_MODEM_STATUS: 597 qt2_update_msr(port, ch + 1); 598 break; 599 } 600 } 601 602 /* not needed, kept to document functionality */ 603 static void qt2_process_xmit_empty(struct usb_serial_port *port, 604 unsigned char *ch) 605 { 606 int bytes_written; 607 608 bytes_written = (int)(*ch) + (int)(*(ch + 1) << 4); 609 } 610 611 /* not needed, kept to document functionality */ 612 static void qt2_process_flush(struct usb_serial_port *port, unsigned char *ch) 613 { 614 return; 615 } 616 617 void qt2_process_read_urb(struct urb *urb) 618 { 619 struct usb_serial *serial; 620 struct qt2_serial_private *serial_priv; 621 struct usb_serial_port *port; 622 struct qt2_port_private *port_priv; 623 struct tty_struct *tty; 624 bool escapeflag; 625 unsigned char *ch; 626 int i; 627 unsigned char newport; 628 int len = urb->actual_length; 629 630 if (!len) 631 return; 632 633 ch = urb->transfer_buffer; 634 tty = NULL; 635 serial = urb->context; 636 serial_priv = usb_get_serial_data(serial); 637 port = serial->port[serial_priv->current_port]; 638 port_priv = usb_get_serial_port_data(port); 639 640 if (port_priv->is_open) 641 tty = tty_port_tty_get(&port->port); 642 643 for (i = 0; i < urb->actual_length; i++) { 644 ch = (unsigned char *)urb->transfer_buffer + i; 645 if ((i <= (len - 3)) && 646 (*ch == QT2_CONTROL_BYTE) && 647 (*(ch + 1) == QT2_CONTROL_BYTE)) { 648 escapeflag = false; 649 switch (*(ch + 2)) { 650 case QT2_LINE_STATUS: 651 case QT2_MODEM_STATUS: 652 if (i > (len - 4)) { 653 dev_warn(&port->dev, 654 "%s - status message too short\n", 655 __func__); 656 break; 657 } 658 qt2_process_status(port, ch + 2); 659 i += 3; 660 escapeflag = true; 661 break; 662 case QT2_XMIT_HOLD: 663 if (i > (len - 5)) { 664 dev_warn(&port->dev, 665 "%s - xmit_empty message too short\n", 666 __func__); 667 break; 668 } 669 qt2_process_xmit_empty(port, ch + 3); 670 i += 4; 671 escapeflag = true; 672 break; 673 case QT2_CHANGE_PORT: 674 if (i > (len - 4)) { 675 dev_warn(&port->dev, 676 "%s - change_port message too short\n", 677 __func__); 678 break; 679 } 680 if (tty) { 681 tty_flip_buffer_push(tty); 682 tty_kref_put(tty); 683 } 684 685 newport = *(ch + 3); 686 687 if (newport > serial->num_ports) { 688 dev_err(&port->dev, 689 "%s - port change to invalid port: %i\n", 690 __func__, newport); 691 break; 692 } 693 694 serial_priv->current_port = newport; 695 port = serial->port[serial_priv->current_port]; 696 port_priv = usb_get_serial_port_data(port); 697 if (port_priv->is_open) 698 tty = tty_port_tty_get(&port->port); 699 else 700 tty = NULL; 701 i += 3; 702 escapeflag = true; 703 break; 704 case QT2_REC_FLUSH: 705 case QT2_XMIT_FLUSH: 706 qt2_process_flush(port, ch + 2); 707 i += 2; 708 escapeflag = true; 709 break; 710 case QT2_CONTROL_ESCAPE: 711 tty_buffer_request_room(tty, 2); 712 tty_insert_flip_string(tty, ch, 2); 713 i += 2; 714 escapeflag = true; 715 break; 716 default: 717 dev_warn(&port->dev, 718 "%s - unsupported command %i\n", 719 __func__, *(ch + 2)); 720 break; 721 } 722 if (escapeflag) 723 continue; 724 } 725 726 if (tty) { 727 tty_buffer_request_room(tty, 1); 728 tty_insert_flip_string(tty, ch, 1); 729 } 730 } 731 732 if (tty) { 733 tty_flip_buffer_push(tty); 734 tty_kref_put(tty); 735 } 736 } 737 738 static void qt2_write_bulk_callback(struct urb *urb) 739 { 740 struct usb_serial_port *port; 741 struct qt2_port_private *port_priv; 742 743 port = urb->context; 744 port_priv = usb_get_serial_port_data(port); 745 746 spin_lock(&port_priv->urb_lock); 747 748 port_priv->urb_in_use = false; 749 usb_serial_port_softint(port); 750 751 spin_unlock(&port_priv->urb_lock); 752 753 } 754 755 static void qt2_read_bulk_callback(struct urb *urb) 756 { 757 struct usb_serial *serial = urb->context; 758 int status; 759 760 if (urb->status) { 761 dev_warn(&serial->dev->dev, 762 "%s - non-zero urb status: %i\n", __func__, 763 urb->status); 764 return; 765 } 766 767 qt2_process_read_urb(urb); 768 769 status = usb_submit_urb(urb, GFP_ATOMIC); 770 if (status != 0) 771 dev_err(&serial->dev->dev, 772 "%s - resubmit read urb failed: %i\n", 773 __func__, status); 774 } 775 776 static int qt2_setup_urbs(struct usb_serial *serial) 777 { 778 struct usb_serial_port *port; 779 struct usb_serial_port *port0; 780 struct qt2_serial_private *serial_priv; 781 struct qt2_port_private *port_priv; 782 int pcount, status; 783 784 port0 = serial->port[0]; 785 786 serial_priv = usb_get_serial_data(serial); 787 serial_priv->read_urb = usb_alloc_urb(0, GFP_KERNEL); 788 if (!serial_priv->read_urb) { 789 dev_err(&serial->dev->dev, "No free urbs available\n"); 790 return -ENOMEM; 791 } 792 793 usb_fill_bulk_urb(serial_priv->read_urb, serial->dev, 794 usb_rcvbulkpipe(serial->dev, 795 port0->bulk_in_endpointAddress), 796 serial_priv->read_buffer, 797 sizeof(serial_priv->read_buffer), 798 qt2_read_bulk_callback, serial); 799 800 /* setup write_urb for each port */ 801 for (pcount = 0; pcount < serial->num_ports; pcount++) { 802 803 port = serial->port[pcount]; 804 port_priv = usb_get_serial_port_data(port); 805 806 port_priv->write_urb = usb_alloc_urb(0, GFP_KERNEL); 807 if (!port_priv->write_urb) { 808 dev_err(&serial->dev->dev, 809 "failed to alloc write_urb for port %i\n", 810 pcount); 811 return -ENOMEM; 812 } 813 814 usb_fill_bulk_urb(port_priv->write_urb, 815 serial->dev, 816 usb_sndbulkpipe(serial->dev, 817 port0-> 818 bulk_out_endpointAddress), 819 port_priv->write_buffer, 820 sizeof(port_priv->write_buffer), 821 qt2_write_bulk_callback, port); 822 } 823 824 status = usb_submit_urb(serial_priv->read_urb, GFP_KERNEL); 825 if (status != 0) { 826 dev_err(&serial->dev->dev, 827 "%s - submit read urb failed %i\n", __func__, status); 828 return status; 829 } 830 831 return 0; 832 833 } 834 835 static int qt2_attach(struct usb_serial *serial) 836 { 837 struct qt2_serial_private *serial_priv; 838 struct qt2_port_private *port_priv; 839 int status, pcount; 840 841 /* power on unit */ 842 status = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 843 0xc2, 0x40, 0x8000, 0, NULL, 0, 844 QT2_USB_TIMEOUT); 845 if (status < 0) { 846 dev_err(&serial->dev->dev, 847 "%s - failed to power on unit: %i\n", __func__, status); 848 return status; 849 } 850 851 serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL); 852 if (!serial_priv) { 853 dev_err(&serial->dev->dev, "%s - Out of memory\n", __func__); 854 return -ENOMEM; 855 } 856 857 usb_set_serial_data(serial, serial_priv); 858 859 for (pcount = 0; pcount < serial->num_ports; pcount++) { 860 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL); 861 if (!port_priv) { 862 dev_err(&serial->dev->dev, 863 "%s- kmalloc(%Zd) failed.\n", __func__, 864 sizeof(*port_priv)); 865 pcount--; 866 status = -ENOMEM; 867 goto attach_failed; 868 } 869 870 spin_lock_init(&port_priv->lock); 871 spin_lock_init(&port_priv->urb_lock); 872 init_waitqueue_head(&port_priv->delta_msr_wait); 873 874 port_priv->port = serial->port[pcount]; 875 876 usb_set_serial_port_data(serial->port[pcount], port_priv); 877 } 878 879 status = qt2_setup_urbs(serial); 880 if (status != 0) 881 goto attach_failed; 882 883 return 0; 884 885 attach_failed: 886 for (/* empty */; pcount >= 0; pcount--) { 887 port_priv = usb_get_serial_port_data(serial->port[pcount]); 888 kfree(port_priv); 889 } 890 kfree(serial_priv); 891 return status; 892 } 893 894 static int qt2_tiocmget(struct tty_struct *tty) 895 { 896 struct usb_serial_port *port = tty->driver_data; 897 struct usb_device *dev = port->serial->dev; 898 struct qt2_port_private *port_priv = usb_get_serial_port_data(port); 899 u8 *d; 900 int r; 901 902 d = kzalloc(2, GFP_KERNEL); 903 if (!d) 904 return -ENOMEM; 905 906 r = qt2_getregister(dev, port_priv->device_port, UART_MCR, d); 907 if (r < 0) 908 goto mget_out; 909 910 r = qt2_getregister(dev, port_priv->device_port, UART_MSR, d + 1); 911 if (r < 0) 912 goto mget_out; 913 914 r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) | 915 (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) | 916 (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) | 917 (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) | 918 (d[1] & UART_MSR_RI ? TIOCM_RI : 0) | 919 (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0); 920 921 mget_out: 922 kfree(d); 923 return r; 924 } 925 926 static int qt2_tiocmset(struct tty_struct *tty, 927 unsigned int set, unsigned int clear) 928 { 929 struct qt2_port_private *port_priv; 930 931 port_priv = usb_get_serial_port_data(tty->driver_data); 932 return update_mctrl(port_priv, set, clear); 933 } 934 935 static void qt2_break_ctl(struct tty_struct *tty, int break_state) 936 { 937 struct usb_serial_port *port = tty->driver_data; 938 struct qt2_port_private *port_priv; 939 int status; 940 u16 val; 941 942 port_priv = usb_get_serial_port_data(port); 943 944 if (!port_priv->is_open) { 945 dev_err(&port->dev, 946 "%s - port is not open\n", __func__); 947 return; 948 } 949 950 val = (break_state == -1) ? 1 : 0; 951 952 status = qt2_control_msg(port->serial->dev, QT2_BREAK_CONTROL, 953 val, port_priv->device_port); 954 if (status < 0) 955 dev_warn(&port->dev, 956 "%s - failed to send control message: %i\n", __func__, 957 status); 958 } 959 960 961 962 static void qt2_dtr_rts(struct usb_serial_port *port, int on) 963 { 964 struct usb_device *dev = port->serial->dev; 965 struct qt2_port_private *port_priv = usb_get_serial_port_data(port); 966 967 mutex_lock(&port->serial->disc_mutex); 968 if (!port->serial->disconnected) { 969 /* Disable flow control */ 970 if (!on && qt2_setregister(dev, port_priv->device_port, 971 UART_MCR, 0) < 0) 972 dev_warn(&port->dev, "error from flowcontrol urb\n"); 973 /* drop RTS and DTR */ 974 if (on) 975 update_mctrl(port_priv, TIOCM_DTR | TIOCM_RTS, 0); 976 else 977 update_mctrl(port_priv, 0, TIOCM_DTR | TIOCM_RTS); 978 } 979 mutex_unlock(&port->serial->disc_mutex); 980 } 981 982 static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch) 983 { 984 struct qt2_port_private *port_priv; 985 u8 newMSR = (u8) *ch; 986 unsigned long flags; 987 988 port_priv = usb_get_serial_port_data(port); 989 990 spin_lock_irqsave(&port_priv->lock, flags); 991 port_priv->shadowMSR = newMSR; 992 spin_unlock_irqrestore(&port_priv->lock, flags); 993 994 if (newMSR & UART_MSR_ANY_DELTA) { 995 /* update input line counters */ 996 if (newMSR & UART_MSR_DCTS) 997 port_priv->icount.cts++; 998 999 if (newMSR & UART_MSR_DDSR) 1000 port_priv->icount.dsr++; 1001 1002 if (newMSR & UART_MSR_DDCD) 1003 port_priv->icount.dcd++; 1004 1005 if (newMSR & UART_MSR_TERI) 1006 port_priv->icount.rng++; 1007 1008 wake_up_interruptible(&port_priv->delta_msr_wait); 1009 } 1010 } 1011 1012 static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch) 1013 { 1014 struct qt2_port_private *port_priv; 1015 struct async_icount *icount; 1016 unsigned long flags; 1017 u8 newLSR = (u8) *ch; 1018 1019 port_priv = usb_get_serial_port_data(port); 1020 1021 if (newLSR & UART_LSR_BI) 1022 newLSR &= (u8) (UART_LSR_OE | UART_LSR_BI); 1023 1024 spin_lock_irqsave(&port_priv->lock, flags); 1025 port_priv->shadowLSR = newLSR; 1026 spin_unlock_irqrestore(&port_priv->lock, flags); 1027 1028 icount = &port_priv->icount; 1029 1030 if (newLSR & UART_LSR_BRK_ERROR_BITS) { 1031 1032 if (newLSR & UART_LSR_BI) 1033 icount->brk++; 1034 1035 if (newLSR & UART_LSR_OE) 1036 icount->overrun++; 1037 1038 if (newLSR & UART_LSR_PE) 1039 icount->parity++; 1040 1041 if (newLSR & UART_LSR_FE) 1042 icount->frame++; 1043 } 1044 1045 } 1046 1047 static int qt2_write_room(struct tty_struct *tty) 1048 { 1049 struct usb_serial_port *port = tty->driver_data; 1050 struct qt2_port_private *port_priv; 1051 unsigned long flags = 0; 1052 int r; 1053 1054 port_priv = usb_get_serial_port_data(port); 1055 1056 spin_lock_irqsave(&port_priv->urb_lock, flags); 1057 1058 if (port_priv->urb_in_use) 1059 r = 0; 1060 else 1061 r = QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE; 1062 1063 spin_unlock_irqrestore(&port_priv->urb_lock, flags); 1064 1065 return r; 1066 } 1067 1068 static int qt2_write(struct tty_struct *tty, 1069 struct usb_serial_port *port, 1070 const unsigned char *buf, int count) 1071 { 1072 struct qt2_port_private *port_priv; 1073 struct urb *write_urb; 1074 unsigned char *data; 1075 unsigned long flags; 1076 int status; 1077 int bytes_out = 0; 1078 1079 port_priv = usb_get_serial_port_data(port); 1080 1081 if (port_priv->write_urb == NULL) { 1082 dev_err(&port->dev, "%s - no output urb\n", __func__); 1083 return 0; 1084 } 1085 write_urb = port_priv->write_urb; 1086 1087 count = min(count, QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE); 1088 1089 data = write_urb->transfer_buffer; 1090 spin_lock_irqsave(&port_priv->urb_lock, flags); 1091 if (port_priv->urb_in_use == true) { 1092 printk(KERN_INFO "qt2_write - urb is in use\n"); 1093 goto write_out; 1094 } 1095 1096 *data++ = QT2_CONTROL_BYTE; 1097 *data++ = QT2_CONTROL_BYTE; 1098 *data++ = port_priv->device_port; 1099 put_unaligned_le16(count, data); 1100 data += 2; 1101 memcpy(data, buf, count); 1102 1103 write_urb->transfer_buffer_length = count + QT2_WRITE_CONTROL_SIZE; 1104 1105 status = usb_submit_urb(write_urb, GFP_ATOMIC); 1106 if (status == 0) { 1107 port_priv->urb_in_use = true; 1108 bytes_out += count; 1109 } 1110 1111 write_out: 1112 spin_unlock_irqrestore(&port_priv->urb_lock, flags); 1113 return bytes_out; 1114 } 1115 1116 1117 static struct usb_serial_driver qt2_device = { 1118 .driver = { 1119 .owner = THIS_MODULE, 1120 .name = "quatech-serial", 1121 }, 1122 .description = DRIVER_DESC, 1123 .id_table = id_table, 1124 .open = qt2_open, 1125 .close = qt2_close, 1126 .write = qt2_write, 1127 .write_room = qt2_write_room, 1128 .calc_num_ports = qt2_calc_num_ports, 1129 .attach = qt2_attach, 1130 .release = qt2_release, 1131 .disconnect = qt2_disconnect, 1132 .dtr_rts = qt2_dtr_rts, 1133 .break_ctl = qt2_break_ctl, 1134 .tiocmget = qt2_tiocmget, 1135 .tiocmset = qt2_tiocmset, 1136 .get_icount = qt2_get_icount, 1137 .ioctl = qt2_ioctl, 1138 .set_termios = qt2_set_termios, 1139 }; 1140 1141 static struct usb_serial_driver *const serial_drivers[] = { 1142 &qt2_device, NULL 1143 }; 1144 1145 module_usb_serial_driver(serial_drivers, id_table); 1146 1147 MODULE_DESCRIPTION(DRIVER_DESC); 1148 MODULE_LICENSE("GPL"); 1149 1150 module_param(debug, bool, S_IRUGO | S_IWUSR); 1151 MODULE_PARM_DESC(debug, "Debug enabled or not"); 1152