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 int i; 147 148 kfree(usb_get_serial_data(serial)); 149 150 for (i = 0; i < serial->num_ports; i++) 151 kfree(usb_get_serial_port_data(serial->port[i])); 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 if (port_priv->write_urb->status == -EINPROGRESS) 427 usb_kill_urb(port_priv->write_urb); 428 port_priv->urb_in_use = false; 429 spin_unlock_irqrestore(&port_priv->urb_lock, flags); 430 431 /* flush the port transmit buffer */ 432 i = usb_control_msg(serial->dev, 433 usb_rcvctrlpipe(serial->dev, 0), 434 QT2_FLUSH_DEVICE, 0x40, 1, 435 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT); 436 437 if (i < 0) 438 dev_err(&port->dev, "%s - transmit buffer flush failed: %i\n", 439 __func__, i); 440 441 /* flush the port receive buffer */ 442 i = usb_control_msg(serial->dev, 443 usb_rcvctrlpipe(serial->dev, 0), 444 QT2_FLUSH_DEVICE, 0x40, 0, 445 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT); 446 447 if (i < 0) 448 dev_err(&port->dev, "%s - receive buffer flush failed: %i\n", 449 __func__, i); 450 451 /* close the port */ 452 i = usb_control_msg(serial->dev, 453 usb_sndctrlpipe(serial->dev, 0), 454 QT_OPEN_CLOSE_CHANNEL, 455 0x40, 0, 456 port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT); 457 458 if (i < 0) 459 dev_err(&port->dev, "%s - close port failed %i\n", 460 __func__, i); 461 462 } 463 464 static void qt2_disconnect(struct usb_serial *serial) 465 { 466 struct qt2_serial_private *serial_priv = usb_get_serial_data(serial); 467 struct qt2_port_private *port_priv; 468 int i; 469 470 if (serial_priv->read_urb->status == -EINPROGRESS) 471 usb_kill_urb(serial_priv->read_urb); 472 473 usb_free_urb(serial_priv->read_urb); 474 475 for (i = 0; i < serial->num_ports; i++) { 476 port_priv = usb_get_serial_port_data(serial->port[i]); 477 478 if (port_priv->write_urb->status == -EINPROGRESS) 479 usb_kill_urb(port_priv->write_urb); 480 usb_free_urb(port_priv->write_urb); 481 } 482 } 483 484 static int get_serial_info(struct usb_serial_port *port, 485 struct serial_struct __user *retinfo) 486 { 487 struct serial_struct tmp; 488 489 if (!retinfo) 490 return -EFAULT; 491 492 memset(&tmp, 0, sizeof(tmp)); 493 tmp.line = port->serial->minor; 494 tmp.port = 0; 495 tmp.irq = 0; 496 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ; 497 tmp.xmit_fifo_size = port->bulk_out_size; 498 tmp.baud_base = 9600; 499 tmp.close_delay = 5*HZ; 500 tmp.closing_wait = 30*HZ; 501 502 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo))) 503 return -EFAULT; 504 return 0; 505 } 506 507 static int wait_modem_info(struct usb_serial_port *port, unsigned int arg) 508 { 509 struct qt2_port_private *priv = usb_get_serial_port_data(port); 510 struct async_icount prev, cur; 511 unsigned long flags; 512 513 spin_lock_irqsave(&priv->lock, flags); 514 prev = priv->icount; 515 spin_unlock_irqrestore(&priv->lock, flags); 516 517 while (1) { 518 wait_event_interruptible(priv->delta_msr_wait, 519 ((priv->icount.rng != prev.rng) || 520 (priv->icount.dsr != prev.dsr) || 521 (priv->icount.dcd != prev.dcd) || 522 (priv->icount.cts != prev.cts))); 523 524 if (signal_pending(current)) 525 return -ERESTARTSYS; 526 527 spin_lock_irqsave(&priv->lock, flags); 528 cur = priv->icount; 529 spin_unlock_irqrestore(&priv->lock, flags); 530 531 if ((prev.rng == cur.rng) && 532 (prev.dsr == cur.dsr) && 533 (prev.dcd == cur.dcd) && 534 (prev.cts == cur.cts)) 535 return -EIO; 536 537 if ((arg & TIOCM_RNG && (prev.rng != cur.rng)) || 538 (arg & TIOCM_DSR && (prev.dsr != cur.dsr)) || 539 (arg & TIOCM_CD && (prev.dcd != cur.dcd)) || 540 (arg & TIOCM_CTS && (prev.cts != cur.cts))) 541 return 0; 542 } 543 return 0; 544 } 545 546 static int qt2_get_icount(struct tty_struct *tty, 547 struct serial_icounter_struct *icount) 548 { 549 struct usb_serial_port *port = tty->driver_data; 550 struct qt2_port_private *priv = usb_get_serial_port_data(port); 551 struct async_icount cnow = priv->icount; 552 553 icount->cts = cnow.cts; 554 icount->dsr = cnow.dsr; 555 icount->rng = cnow.rng; 556 icount->dcd = cnow.dcd; 557 icount->rx = cnow.rx; 558 icount->tx = cnow.tx; 559 icount->frame = cnow.frame; 560 icount->overrun = cnow.overrun; 561 icount->parity = cnow.parity; 562 icount->brk = cnow.brk; 563 icount->buf_overrun = cnow.buf_overrun; 564 565 return 0; 566 } 567 568 static int qt2_ioctl(struct tty_struct *tty, 569 unsigned int cmd, unsigned long arg) 570 { 571 struct usb_serial_port *port = tty->driver_data; 572 573 switch (cmd) { 574 case TIOCGSERIAL: 575 return get_serial_info(port, 576 (struct serial_struct __user *)arg); 577 578 case TIOCMIWAIT: 579 return wait_modem_info(port, arg); 580 581 default: 582 break; 583 } 584 585 return -ENOIOCTLCMD; 586 } 587 588 static void qt2_process_status(struct usb_serial_port *port, unsigned char *ch) 589 { 590 switch (*ch) { 591 case QT2_LINE_STATUS: 592 qt2_update_lsr(port, ch + 1); 593 break; 594 case QT2_MODEM_STATUS: 595 qt2_update_msr(port, ch + 1); 596 break; 597 } 598 } 599 600 /* not needed, kept to document functionality */ 601 static void qt2_process_xmit_empty(struct usb_serial_port *port, 602 unsigned char *ch) 603 { 604 int bytes_written; 605 606 bytes_written = (int)(*ch) + (int)(*(ch + 1) << 4); 607 } 608 609 /* not needed, kept to document functionality */ 610 static void qt2_process_flush(struct usb_serial_port *port, unsigned char *ch) 611 { 612 return; 613 } 614 615 void qt2_process_read_urb(struct urb *urb) 616 { 617 struct usb_serial *serial; 618 struct qt2_serial_private *serial_priv; 619 struct usb_serial_port *port; 620 struct qt2_port_private *port_priv; 621 struct tty_struct *tty; 622 bool escapeflag; 623 unsigned char *ch; 624 int i; 625 unsigned char newport; 626 int len = urb->actual_length; 627 628 if (!len) 629 return; 630 631 ch = urb->transfer_buffer; 632 tty = NULL; 633 serial = urb->context; 634 serial_priv = usb_get_serial_data(serial); 635 port = serial->port[serial_priv->current_port]; 636 port_priv = usb_get_serial_port_data(port); 637 638 if (port_priv->is_open) 639 tty = tty_port_tty_get(&port->port); 640 641 for (i = 0; i < urb->actual_length; i++) { 642 ch = (unsigned char *)urb->transfer_buffer + i; 643 if ((i <= (len - 3)) && 644 (*ch == QT2_CONTROL_BYTE) && 645 (*(ch + 1) == QT2_CONTROL_BYTE)) { 646 escapeflag = false; 647 switch (*(ch + 2)) { 648 case QT2_LINE_STATUS: 649 case QT2_MODEM_STATUS: 650 if (i > (len - 4)) { 651 dev_warn(&port->dev, 652 "%s - status message too short\n", 653 __func__); 654 break; 655 } 656 qt2_process_status(port, ch + 2); 657 i += 3; 658 escapeflag = true; 659 break; 660 case QT2_XMIT_HOLD: 661 if (i > (len - 5)) { 662 dev_warn(&port->dev, 663 "%s - xmit_empty message too short\n", 664 __func__); 665 break; 666 } 667 qt2_process_xmit_empty(port, ch + 3); 668 i += 4; 669 escapeflag = true; 670 break; 671 case QT2_CHANGE_PORT: 672 if (i > (len - 4)) { 673 dev_warn(&port->dev, 674 "%s - change_port message too short\n", 675 __func__); 676 break; 677 } 678 if (tty) { 679 tty_flip_buffer_push(tty); 680 tty_kref_put(tty); 681 } 682 683 newport = *(ch + 3); 684 685 if (newport > serial->num_ports) { 686 dev_err(&port->dev, 687 "%s - port change to invalid port: %i\n", 688 __func__, newport); 689 break; 690 } 691 692 serial_priv->current_port = newport; 693 port = serial->port[serial_priv->current_port]; 694 port_priv = usb_get_serial_port_data(port); 695 if (port_priv->is_open) 696 tty = tty_port_tty_get(&port->port); 697 else 698 tty = NULL; 699 i += 3; 700 escapeflag = true; 701 break; 702 case QT2_REC_FLUSH: 703 case QT2_XMIT_FLUSH: 704 qt2_process_flush(port, ch + 2); 705 i += 2; 706 escapeflag = true; 707 break; 708 case QT2_CONTROL_ESCAPE: 709 tty_buffer_request_room(tty, 2); 710 tty_insert_flip_string(tty, ch, 2); 711 i += 2; 712 escapeflag = true; 713 break; 714 default: 715 dev_warn(&port->dev, 716 "%s - unsupported command %i\n", 717 __func__, *(ch + 2)); 718 break; 719 } 720 if (escapeflag) 721 continue; 722 } 723 724 if (tty) { 725 tty_buffer_request_room(tty, 1); 726 tty_insert_flip_string(tty, ch, 1); 727 } 728 } 729 730 if (tty) { 731 tty_flip_buffer_push(tty); 732 tty_kref_put(tty); 733 } 734 } 735 736 static void qt2_write_bulk_callback(struct urb *urb) 737 { 738 struct usb_serial_port *port; 739 struct qt2_port_private *port_priv; 740 741 port = urb->context; 742 port_priv = usb_get_serial_port_data(port); 743 744 spin_lock(&port_priv->urb_lock); 745 746 port_priv->urb_in_use = false; 747 usb_serial_port_softint(port); 748 749 spin_unlock(&port_priv->urb_lock); 750 751 } 752 753 static void qt2_read_bulk_callback(struct urb *urb) 754 { 755 struct usb_serial *serial = urb->context; 756 int status; 757 758 if (urb->status) { 759 dev_warn(&serial->dev->dev, 760 "%s - non-zero urb status: %i\n", __func__, 761 urb->status); 762 return; 763 } 764 765 qt2_process_read_urb(urb); 766 767 status = usb_submit_urb(urb, GFP_ATOMIC); 768 if (status != 0) 769 dev_err(&serial->dev->dev, 770 "%s - resubmit read urb failed: %i\n", 771 __func__, status); 772 } 773 774 static int qt2_setup_urbs(struct usb_serial *serial) 775 { 776 struct usb_serial_port *port; 777 struct usb_serial_port *port0; 778 struct qt2_serial_private *serial_priv; 779 struct qt2_port_private *port_priv; 780 int pcount, status; 781 782 port0 = serial->port[0]; 783 784 serial_priv = usb_get_serial_data(serial); 785 serial_priv->read_urb = usb_alloc_urb(0, GFP_KERNEL); 786 if (!serial_priv->read_urb) { 787 dev_err(&serial->dev->dev, "No free urbs available\n"); 788 return -ENOMEM; 789 } 790 791 usb_fill_bulk_urb(serial_priv->read_urb, serial->dev, 792 usb_rcvbulkpipe(serial->dev, 793 port0->bulk_in_endpointAddress), 794 serial_priv->read_buffer, 795 sizeof(serial_priv->read_buffer), 796 qt2_read_bulk_callback, serial); 797 798 /* setup write_urb for each port */ 799 for (pcount = 0; pcount < serial->num_ports; pcount++) { 800 801 port = serial->port[pcount]; 802 port_priv = usb_get_serial_port_data(port); 803 804 port_priv->write_urb = usb_alloc_urb(0, GFP_KERNEL); 805 if (!port_priv->write_urb) { 806 dev_err(&serial->dev->dev, 807 "failed to alloc write_urb for port %i\n", 808 pcount); 809 return -ENOMEM; 810 } 811 812 usb_fill_bulk_urb(port_priv->write_urb, 813 serial->dev, 814 usb_sndbulkpipe(serial->dev, 815 port0-> 816 bulk_out_endpointAddress), 817 port_priv->write_buffer, 818 sizeof(port_priv->write_buffer), 819 qt2_write_bulk_callback, port); 820 } 821 822 status = usb_submit_urb(serial_priv->read_urb, GFP_KERNEL); 823 if (status != 0) { 824 dev_err(&serial->dev->dev, 825 "%s - submit read urb failed %i\n", __func__, status); 826 return status; 827 } 828 829 return 0; 830 831 } 832 833 static int qt2_attach(struct usb_serial *serial) 834 { 835 struct qt2_serial_private *serial_priv; 836 struct qt2_port_private *port_priv; 837 int status, pcount; 838 839 /* power on unit */ 840 status = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 841 0xc2, 0x40, 0x8000, 0, NULL, 0, 842 QT2_USB_TIMEOUT); 843 if (status < 0) { 844 dev_err(&serial->dev->dev, 845 "%s - failed to power on unit: %i\n", __func__, status); 846 return status; 847 } 848 849 serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL); 850 if (!serial_priv) { 851 dev_err(&serial->dev->dev, "%s - Out of memory\n", __func__); 852 return -ENOMEM; 853 } 854 855 usb_set_serial_data(serial, serial_priv); 856 857 for (pcount = 0; pcount < serial->num_ports; pcount++) { 858 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL); 859 if (!port_priv) { 860 dev_err(&serial->dev->dev, 861 "%s- kmalloc(%Zd) failed.\n", __func__, 862 sizeof(*port_priv)); 863 pcount--; 864 status = -ENOMEM; 865 goto attach_failed; 866 } 867 868 spin_lock_init(&port_priv->lock); 869 spin_lock_init(&port_priv->urb_lock); 870 init_waitqueue_head(&port_priv->delta_msr_wait); 871 872 port_priv->port = serial->port[pcount]; 873 874 usb_set_serial_port_data(serial->port[pcount], port_priv); 875 } 876 877 status = qt2_setup_urbs(serial); 878 if (status != 0) 879 goto attach_failed; 880 881 return 0; 882 883 attach_failed: 884 for (/* empty */; pcount >= 0; pcount--) { 885 port_priv = usb_get_serial_port_data(serial->port[pcount]); 886 kfree(port_priv); 887 } 888 kfree(serial_priv); 889 return status; 890 } 891 892 static int qt2_tiocmget(struct tty_struct *tty) 893 { 894 struct usb_serial_port *port = tty->driver_data; 895 struct usb_device *dev = port->serial->dev; 896 struct qt2_port_private *port_priv = usb_get_serial_port_data(port); 897 u8 *d; 898 int r; 899 900 d = kzalloc(2, GFP_KERNEL); 901 if (!d) 902 return -ENOMEM; 903 904 r = qt2_getregister(dev, port_priv->device_port, UART_MCR, d); 905 if (r < 0) 906 goto mget_out; 907 908 r = qt2_getregister(dev, port_priv->device_port, UART_MSR, d + 1); 909 if (r < 0) 910 goto mget_out; 911 912 r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) | 913 (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) | 914 (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) | 915 (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) | 916 (d[1] & UART_MSR_RI ? TIOCM_RI : 0) | 917 (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0); 918 919 mget_out: 920 kfree(d); 921 return r; 922 } 923 924 static int qt2_tiocmset(struct tty_struct *tty, 925 unsigned int set, unsigned int clear) 926 { 927 struct qt2_port_private *port_priv; 928 929 port_priv = usb_get_serial_port_data(tty->driver_data); 930 return update_mctrl(port_priv, set, clear); 931 } 932 933 static void qt2_break_ctl(struct tty_struct *tty, int break_state) 934 { 935 struct usb_serial_port *port = tty->driver_data; 936 struct qt2_port_private *port_priv; 937 int status; 938 u16 val; 939 940 port_priv = usb_get_serial_port_data(port); 941 942 if (!port_priv->is_open) { 943 dev_err(&port->dev, 944 "%s - port is not open\n", __func__); 945 return; 946 } 947 948 val = (break_state == -1) ? 1 : 0; 949 950 status = qt2_control_msg(port->serial->dev, QT2_BREAK_CONTROL, 951 val, port_priv->device_port); 952 if (status < 0) 953 dev_warn(&port->dev, 954 "%s - failed to send control message: %i\n", __func__, 955 status); 956 } 957 958 959 960 static void qt2_dtr_rts(struct usb_serial_port *port, int on) 961 { 962 struct usb_device *dev = port->serial->dev; 963 struct qt2_port_private *port_priv = usb_get_serial_port_data(port); 964 965 mutex_lock(&port->serial->disc_mutex); 966 if (!port->serial->disconnected) { 967 /* Disable flow control */ 968 if (!on && qt2_setregister(dev, port_priv->device_port, 969 UART_MCR, 0) < 0) 970 dev_warn(&port->dev, "error from flowcontrol urb\n"); 971 /* drop RTS and DTR */ 972 if (on) 973 update_mctrl(port_priv, TIOCM_DTR | TIOCM_RTS, 0); 974 else 975 update_mctrl(port_priv, 0, TIOCM_DTR | TIOCM_RTS); 976 } 977 mutex_unlock(&port->serial->disc_mutex); 978 } 979 980 static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch) 981 { 982 struct qt2_port_private *port_priv; 983 u8 newMSR = (u8) *ch; 984 unsigned long flags; 985 986 port_priv = usb_get_serial_port_data(port); 987 988 spin_lock_irqsave(&port_priv->lock, flags); 989 port_priv->shadowMSR = newMSR; 990 spin_unlock_irqrestore(&port_priv->lock, flags); 991 992 if (newMSR & UART_MSR_ANY_DELTA) { 993 /* update input line counters */ 994 if (newMSR & UART_MSR_DCTS) 995 port_priv->icount.cts++; 996 997 if (newMSR & UART_MSR_DDSR) 998 port_priv->icount.dsr++; 999 1000 if (newMSR & UART_MSR_DDCD) 1001 port_priv->icount.dcd++; 1002 1003 if (newMSR & UART_MSR_TERI) 1004 port_priv->icount.rng++; 1005 1006 wake_up_interruptible(&port_priv->delta_msr_wait); 1007 } 1008 } 1009 1010 static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch) 1011 { 1012 struct qt2_port_private *port_priv; 1013 struct async_icount *icount; 1014 unsigned long flags; 1015 u8 newLSR = (u8) *ch; 1016 1017 port_priv = usb_get_serial_port_data(port); 1018 1019 if (newLSR & UART_LSR_BI) 1020 newLSR &= (u8) (UART_LSR_OE | UART_LSR_BI); 1021 1022 spin_lock_irqsave(&port_priv->lock, flags); 1023 port_priv->shadowLSR = newLSR; 1024 spin_unlock_irqrestore(&port_priv->lock, flags); 1025 1026 icount = &port_priv->icount; 1027 1028 if (newLSR & UART_LSR_BRK_ERROR_BITS) { 1029 1030 if (newLSR & UART_LSR_BI) 1031 icount->brk++; 1032 1033 if (newLSR & UART_LSR_OE) 1034 icount->overrun++; 1035 1036 if (newLSR & UART_LSR_PE) 1037 icount->parity++; 1038 1039 if (newLSR & UART_LSR_FE) 1040 icount->frame++; 1041 } 1042 1043 } 1044 1045 static int qt2_write_room(struct tty_struct *tty) 1046 { 1047 struct usb_serial_port *port = tty->driver_data; 1048 struct qt2_port_private *port_priv; 1049 unsigned long flags = 0; 1050 int r; 1051 1052 port_priv = usb_get_serial_port_data(port); 1053 1054 spin_lock_irqsave(&port_priv->urb_lock, flags); 1055 1056 if (port_priv->urb_in_use) 1057 r = 0; 1058 else 1059 r = QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE; 1060 1061 spin_unlock_irqrestore(&port_priv->urb_lock, flags); 1062 1063 return r; 1064 } 1065 1066 static int qt2_write(struct tty_struct *tty, 1067 struct usb_serial_port *port, 1068 const unsigned char *buf, int count) 1069 { 1070 struct qt2_port_private *port_priv; 1071 struct urb *write_urb; 1072 unsigned char *data; 1073 unsigned long flags; 1074 int status; 1075 int bytes_out = 0; 1076 1077 port_priv = usb_get_serial_port_data(port); 1078 1079 if (port_priv->write_urb == NULL) { 1080 dev_err(&port->dev, "%s - no output urb\n", __func__); 1081 return 0; 1082 } 1083 write_urb = port_priv->write_urb; 1084 1085 count = min(count, QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE); 1086 1087 data = write_urb->transfer_buffer; 1088 spin_lock_irqsave(&port_priv->urb_lock, flags); 1089 if (port_priv->urb_in_use == true) { 1090 dev_err(&port->dev, "qt2_write - urb is in use\n"); 1091 goto write_out; 1092 } 1093 1094 *data++ = QT2_CONTROL_BYTE; 1095 *data++ = QT2_CONTROL_BYTE; 1096 *data++ = port_priv->device_port; 1097 put_unaligned_le16(count, data); 1098 data += 2; 1099 memcpy(data, buf, count); 1100 1101 write_urb->transfer_buffer_length = count + QT2_WRITE_CONTROL_SIZE; 1102 1103 status = usb_submit_urb(write_urb, GFP_ATOMIC); 1104 if (status == 0) { 1105 port_priv->urb_in_use = true; 1106 bytes_out += count; 1107 } 1108 1109 write_out: 1110 spin_unlock_irqrestore(&port_priv->urb_lock, flags); 1111 return bytes_out; 1112 } 1113 1114 1115 static struct usb_serial_driver qt2_device = { 1116 .driver = { 1117 .owner = THIS_MODULE, 1118 .name = "quatech-serial", 1119 }, 1120 .description = DRIVER_DESC, 1121 .id_table = id_table, 1122 .open = qt2_open, 1123 .close = qt2_close, 1124 .write = qt2_write, 1125 .write_room = qt2_write_room, 1126 .calc_num_ports = qt2_calc_num_ports, 1127 .attach = qt2_attach, 1128 .release = qt2_release, 1129 .disconnect = qt2_disconnect, 1130 .dtr_rts = qt2_dtr_rts, 1131 .break_ctl = qt2_break_ctl, 1132 .tiocmget = qt2_tiocmget, 1133 .tiocmset = qt2_tiocmset, 1134 .get_icount = qt2_get_icount, 1135 .ioctl = qt2_ioctl, 1136 .set_termios = qt2_set_termios, 1137 }; 1138 1139 static struct usb_serial_driver *const serial_drivers[] = { 1140 &qt2_device, NULL 1141 }; 1142 1143 module_usb_serial_driver(serial_drivers, id_table); 1144 1145 MODULE_DESCRIPTION(DRIVER_DESC); 1146 MODULE_LICENSE("GPL"); 1147