1 /* 2 * USB Cypress M8 driver 3 * 4 * Copyright (C) 2004 5 * Lonnie Mendez (dignome@gmail.com) 6 * Copyright (C) 2003,2004 7 * Neil Whelchel (koyama@firstlight.net) 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License as published by 11 * the Free Software Foundation; either version 2 of the License, or 12 * (at your option) any later version. 13 * 14 * See Documentation/usb/usb-serial.txt for more information on using this 15 * driver 16 * 17 * See http://geocities.com/i0xox0i for information on this driver and the 18 * earthmate usb device. 19 */ 20 21 /* Thanks to Neil Whelchel for writing the first cypress m8 implementation 22 for linux. */ 23 /* Thanks to cypress for providing references for the hid reports. */ 24 /* Thanks to Jiang Zhang for providing links and for general help. */ 25 /* Code originates and was built up from ftdi_sio, belkin, pl2303 and others.*/ 26 27 28 #include <linux/kernel.h> 29 #include <linux/errno.h> 30 #include <linux/init.h> 31 #include <linux/slab.h> 32 #include <linux/tty.h> 33 #include <linux/tty_driver.h> 34 #include <linux/tty_flip.h> 35 #include <linux/module.h> 36 #include <linux/moduleparam.h> 37 #include <linux/spinlock.h> 38 #include <linux/usb.h> 39 #include <linux/usb/serial.h> 40 #include <linux/serial.h> 41 #include <linux/kfifo.h> 42 #include <linux/delay.h> 43 #include <linux/uaccess.h> 44 #include <asm/unaligned.h> 45 46 #include "cypress_m8.h" 47 48 49 static bool stats; 50 static int interval; 51 static bool unstable_bauds; 52 53 /* 54 * Version Information 55 */ 56 #define DRIVER_VERSION "v1.10" 57 #define DRIVER_AUTHOR "Lonnie Mendez <dignome@gmail.com>, Neil Whelchel <koyama@firstlight.net>" 58 #define DRIVER_DESC "Cypress USB to Serial Driver" 59 60 /* write buffer size defines */ 61 #define CYPRESS_BUF_SIZE 1024 62 63 static const struct usb_device_id id_table_earthmate[] = { 64 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) }, 65 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) }, 66 { } /* Terminating entry */ 67 }; 68 69 static const struct usb_device_id id_table_cyphidcomrs232[] = { 70 { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) }, 71 { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) }, 72 { } /* Terminating entry */ 73 }; 74 75 static const struct usb_device_id id_table_nokiaca42v2[] = { 76 { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) }, 77 { } /* Terminating entry */ 78 }; 79 80 static const struct usb_device_id id_table_combined[] = { 81 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) }, 82 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) }, 83 { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) }, 84 { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) }, 85 { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) }, 86 { } /* Terminating entry */ 87 }; 88 89 MODULE_DEVICE_TABLE(usb, id_table_combined); 90 91 enum packet_format { 92 packet_format_1, /* b0:status, b1:payload count */ 93 packet_format_2 /* b0[7:3]:status, b0[2:0]:payload count */ 94 }; 95 96 struct cypress_private { 97 spinlock_t lock; /* private lock */ 98 int chiptype; /* identifier of device, for quirks/etc */ 99 int bytes_in; /* used for statistics */ 100 int bytes_out; /* used for statistics */ 101 int cmd_count; /* used for statistics */ 102 int cmd_ctrl; /* always set this to 1 before issuing a command */ 103 struct kfifo write_fifo; /* write fifo */ 104 int write_urb_in_use; /* write urb in use indicator */ 105 int write_urb_interval; /* interval to use for write urb */ 106 int read_urb_interval; /* interval to use for read urb */ 107 int comm_is_ok; /* true if communication is (still) ok */ 108 int termios_initialized; 109 __u8 line_control; /* holds dtr / rts value */ 110 __u8 current_status; /* received from last read - info on dsr,cts,cd,ri,etc */ 111 __u8 current_config; /* stores the current configuration byte */ 112 __u8 rx_flags; /* throttling - used from whiteheat/ftdi_sio */ 113 enum packet_format pkt_fmt; /* format to use for packet send / receive */ 114 int get_cfg_unsafe; /* If true, the CYPRESS_GET_CONFIG is unsafe */ 115 int baud_rate; /* stores current baud rate in 116 integer form */ 117 int isthrottled; /* if throttled, discard reads */ 118 wait_queue_head_t delta_msr_wait; /* used for TIOCMIWAIT */ 119 char prev_status, diff_status; /* used for TIOCMIWAIT */ 120 /* we pass a pointer to this as the argument sent to 121 cypress_set_termios old_termios */ 122 struct ktermios tmp_termios; /* stores the old termios settings */ 123 }; 124 125 /* function prototypes for the Cypress USB to serial device */ 126 static int cypress_earthmate_port_probe(struct usb_serial_port *port); 127 static int cypress_hidcom_port_probe(struct usb_serial_port *port); 128 static int cypress_ca42v2_port_probe(struct usb_serial_port *port); 129 static int cypress_port_remove(struct usb_serial_port *port); 130 static int cypress_open(struct tty_struct *tty, struct usb_serial_port *port); 131 static void cypress_close(struct usb_serial_port *port); 132 static void cypress_dtr_rts(struct usb_serial_port *port, int on); 133 static int cypress_write(struct tty_struct *tty, struct usb_serial_port *port, 134 const unsigned char *buf, int count); 135 static void cypress_send(struct usb_serial_port *port); 136 static int cypress_write_room(struct tty_struct *tty); 137 static int cypress_ioctl(struct tty_struct *tty, 138 unsigned int cmd, unsigned long arg); 139 static void cypress_set_termios(struct tty_struct *tty, 140 struct usb_serial_port *port, struct ktermios *old); 141 static int cypress_tiocmget(struct tty_struct *tty); 142 static int cypress_tiocmset(struct tty_struct *tty, 143 unsigned int set, unsigned int clear); 144 static int cypress_chars_in_buffer(struct tty_struct *tty); 145 static void cypress_throttle(struct tty_struct *tty); 146 static void cypress_unthrottle(struct tty_struct *tty); 147 static void cypress_set_dead(struct usb_serial_port *port); 148 static void cypress_read_int_callback(struct urb *urb); 149 static void cypress_write_int_callback(struct urb *urb); 150 151 static struct usb_serial_driver cypress_earthmate_device = { 152 .driver = { 153 .owner = THIS_MODULE, 154 .name = "earthmate", 155 }, 156 .description = "DeLorme Earthmate USB", 157 .id_table = id_table_earthmate, 158 .num_ports = 1, 159 .port_probe = cypress_earthmate_port_probe, 160 .port_remove = cypress_port_remove, 161 .open = cypress_open, 162 .close = cypress_close, 163 .dtr_rts = cypress_dtr_rts, 164 .write = cypress_write, 165 .write_room = cypress_write_room, 166 .ioctl = cypress_ioctl, 167 .set_termios = cypress_set_termios, 168 .tiocmget = cypress_tiocmget, 169 .tiocmset = cypress_tiocmset, 170 .chars_in_buffer = cypress_chars_in_buffer, 171 .throttle = cypress_throttle, 172 .unthrottle = cypress_unthrottle, 173 .read_int_callback = cypress_read_int_callback, 174 .write_int_callback = cypress_write_int_callback, 175 }; 176 177 static struct usb_serial_driver cypress_hidcom_device = { 178 .driver = { 179 .owner = THIS_MODULE, 180 .name = "cyphidcom", 181 }, 182 .description = "HID->COM RS232 Adapter", 183 .id_table = id_table_cyphidcomrs232, 184 .num_ports = 1, 185 .port_probe = cypress_hidcom_port_probe, 186 .port_remove = cypress_port_remove, 187 .open = cypress_open, 188 .close = cypress_close, 189 .dtr_rts = cypress_dtr_rts, 190 .write = cypress_write, 191 .write_room = cypress_write_room, 192 .ioctl = cypress_ioctl, 193 .set_termios = cypress_set_termios, 194 .tiocmget = cypress_tiocmget, 195 .tiocmset = cypress_tiocmset, 196 .chars_in_buffer = cypress_chars_in_buffer, 197 .throttle = cypress_throttle, 198 .unthrottle = cypress_unthrottle, 199 .read_int_callback = cypress_read_int_callback, 200 .write_int_callback = cypress_write_int_callback, 201 }; 202 203 static struct usb_serial_driver cypress_ca42v2_device = { 204 .driver = { 205 .owner = THIS_MODULE, 206 .name = "nokiaca42v2", 207 }, 208 .description = "Nokia CA-42 V2 Adapter", 209 .id_table = id_table_nokiaca42v2, 210 .num_ports = 1, 211 .port_probe = cypress_ca42v2_port_probe, 212 .port_remove = cypress_port_remove, 213 .open = cypress_open, 214 .close = cypress_close, 215 .dtr_rts = cypress_dtr_rts, 216 .write = cypress_write, 217 .write_room = cypress_write_room, 218 .ioctl = cypress_ioctl, 219 .set_termios = cypress_set_termios, 220 .tiocmget = cypress_tiocmget, 221 .tiocmset = cypress_tiocmset, 222 .chars_in_buffer = cypress_chars_in_buffer, 223 .throttle = cypress_throttle, 224 .unthrottle = cypress_unthrottle, 225 .read_int_callback = cypress_read_int_callback, 226 .write_int_callback = cypress_write_int_callback, 227 }; 228 229 static struct usb_serial_driver * const serial_drivers[] = { 230 &cypress_earthmate_device, &cypress_hidcom_device, 231 &cypress_ca42v2_device, NULL 232 }; 233 234 /***************************************************************************** 235 * Cypress serial helper functions 236 *****************************************************************************/ 237 238 239 static int analyze_baud_rate(struct usb_serial_port *port, speed_t new_rate) 240 { 241 struct cypress_private *priv; 242 priv = usb_get_serial_port_data(port); 243 244 if (unstable_bauds) 245 return new_rate; 246 247 /* 248 * The general purpose firmware for the Cypress M8 allows for 249 * a maximum speed of 57600bps (I have no idea whether DeLorme 250 * chose to use the general purpose firmware or not), if you 251 * need to modify this speed setting for your own project 252 * please add your own chiptype and modify the code likewise. 253 * The Cypress HID->COM device will work successfully up to 254 * 115200bps (but the actual throughput is around 3kBps). 255 */ 256 if (port->serial->dev->speed == USB_SPEED_LOW) { 257 /* 258 * Mike Isely <isely@pobox.com> 2-Feb-2008: The 259 * Cypress app note that describes this mechanism 260 * states the the low-speed part can't handle more 261 * than 800 bytes/sec, in which case 4800 baud is the 262 * safest speed for a part like that. 263 */ 264 if (new_rate > 4800) { 265 dev_dbg(&port->dev, 266 "%s - failed setting baud rate, device incapable speed %d\n", 267 __func__, new_rate); 268 return -1; 269 } 270 } 271 switch (priv->chiptype) { 272 case CT_EARTHMATE: 273 if (new_rate <= 600) { 274 /* 300 and 600 baud rates are supported under 275 * the generic firmware, but are not used with 276 * NMEA and SiRF protocols */ 277 dev_dbg(&port->dev, 278 "%s - failed setting baud rate, unsupported speed of %d on Earthmate GPS", 279 __func__, new_rate); 280 return -1; 281 } 282 break; 283 default: 284 break; 285 } 286 return new_rate; 287 } 288 289 290 /* This function can either set or retrieve the current serial line settings */ 291 static int cypress_serial_control(struct tty_struct *tty, 292 struct usb_serial_port *port, speed_t baud_rate, int data_bits, 293 int stop_bits, int parity_enable, int parity_type, int reset, 294 int cypress_request_type) 295 { 296 int new_baudrate = 0, retval = 0, tries = 0; 297 struct cypress_private *priv; 298 struct device *dev = &port->dev; 299 u8 *feature_buffer; 300 const unsigned int feature_len = 5; 301 unsigned long flags; 302 303 priv = usb_get_serial_port_data(port); 304 305 if (!priv->comm_is_ok) 306 return -ENODEV; 307 308 feature_buffer = kcalloc(feature_len, sizeof(u8), GFP_KERNEL); 309 if (!feature_buffer) 310 return -ENOMEM; 311 312 switch (cypress_request_type) { 313 case CYPRESS_SET_CONFIG: 314 /* 0 means 'Hang up' so doesn't change the true bit rate */ 315 new_baudrate = priv->baud_rate; 316 if (baud_rate && baud_rate != priv->baud_rate) { 317 dev_dbg(dev, "%s - baud rate is changing\n", __func__); 318 retval = analyze_baud_rate(port, baud_rate); 319 if (retval >= 0) { 320 new_baudrate = retval; 321 dev_dbg(dev, "%s - New baud rate set to %d\n", 322 __func__, new_baudrate); 323 } 324 } 325 dev_dbg(dev, "%s - baud rate is being sent as %d\n", __func__, 326 new_baudrate); 327 328 /* fill the feature_buffer with new configuration */ 329 put_unaligned_le32(new_baudrate, feature_buffer); 330 feature_buffer[4] |= data_bits; /* assign data bits in 2 bit space ( max 3 ) */ 331 /* 1 bit gap */ 332 feature_buffer[4] |= (stop_bits << 3); /* assign stop bits in 1 bit space */ 333 feature_buffer[4] |= (parity_enable << 4); /* assign parity flag in 1 bit space */ 334 feature_buffer[4] |= (parity_type << 5); /* assign parity type in 1 bit space */ 335 /* 1 bit gap */ 336 feature_buffer[4] |= (reset << 7); /* assign reset at end of byte, 1 bit space */ 337 338 dev_dbg(dev, "%s - device is being sent this feature report:\n", __func__); 339 dev_dbg(dev, "%s - %02X - %02X - %02X - %02X - %02X\n", __func__, 340 feature_buffer[0], feature_buffer[1], 341 feature_buffer[2], feature_buffer[3], 342 feature_buffer[4]); 343 344 do { 345 retval = usb_control_msg(port->serial->dev, 346 usb_sndctrlpipe(port->serial->dev, 0), 347 HID_REQ_SET_REPORT, 348 USB_DIR_OUT | USB_RECIP_INTERFACE | USB_TYPE_CLASS, 349 0x0300, 0, feature_buffer, 350 feature_len, 500); 351 352 if (tries++ >= 3) 353 break; 354 355 } while (retval != feature_len && 356 retval != -ENODEV); 357 358 if (retval != feature_len) { 359 dev_err(dev, "%s - failed sending serial line settings - %d\n", 360 __func__, retval); 361 cypress_set_dead(port); 362 } else { 363 spin_lock_irqsave(&priv->lock, flags); 364 priv->baud_rate = new_baudrate; 365 priv->current_config = feature_buffer[4]; 366 spin_unlock_irqrestore(&priv->lock, flags); 367 /* If we asked for a speed change encode it */ 368 if (baud_rate) 369 tty_encode_baud_rate(tty, 370 new_baudrate, new_baudrate); 371 } 372 break; 373 case CYPRESS_GET_CONFIG: 374 if (priv->get_cfg_unsafe) { 375 /* Not implemented for this device, 376 and if we try to do it we're likely 377 to crash the hardware. */ 378 retval = -ENOTTY; 379 goto out; 380 } 381 dev_dbg(dev, "%s - retreiving serial line settings\n", __func__); 382 do { 383 retval = usb_control_msg(port->serial->dev, 384 usb_rcvctrlpipe(port->serial->dev, 0), 385 HID_REQ_GET_REPORT, 386 USB_DIR_IN | USB_RECIP_INTERFACE | USB_TYPE_CLASS, 387 0x0300, 0, feature_buffer, 388 feature_len, 500); 389 390 if (tries++ >= 3) 391 break; 392 } while (retval != feature_len 393 && retval != -ENODEV); 394 395 if (retval != feature_len) { 396 dev_err(dev, "%s - failed to retrieve serial line settings - %d\n", 397 __func__, retval); 398 cypress_set_dead(port); 399 goto out; 400 } else { 401 spin_lock_irqsave(&priv->lock, flags); 402 /* store the config in one byte, and later 403 use bit masks to check values */ 404 priv->current_config = feature_buffer[4]; 405 priv->baud_rate = get_unaligned_le32(feature_buffer); 406 spin_unlock_irqrestore(&priv->lock, flags); 407 } 408 } 409 spin_lock_irqsave(&priv->lock, flags); 410 ++priv->cmd_count; 411 spin_unlock_irqrestore(&priv->lock, flags); 412 out: 413 kfree(feature_buffer); 414 return retval; 415 } /* cypress_serial_control */ 416 417 418 static void cypress_set_dead(struct usb_serial_port *port) 419 { 420 struct cypress_private *priv = usb_get_serial_port_data(port); 421 unsigned long flags; 422 423 spin_lock_irqsave(&priv->lock, flags); 424 if (!priv->comm_is_ok) { 425 spin_unlock_irqrestore(&priv->lock, flags); 426 return; 427 } 428 priv->comm_is_ok = 0; 429 spin_unlock_irqrestore(&priv->lock, flags); 430 431 dev_err(&port->dev, "cypress_m8 suspending failing port %d - " 432 "interval might be too short\n", port->number); 433 } 434 435 436 /***************************************************************************** 437 * Cypress serial driver functions 438 *****************************************************************************/ 439 440 441 static int cypress_generic_port_probe(struct usb_serial_port *port) 442 { 443 struct usb_serial *serial = port->serial; 444 struct cypress_private *priv; 445 446 priv = kzalloc(sizeof(struct cypress_private), GFP_KERNEL); 447 if (!priv) 448 return -ENOMEM; 449 450 priv->comm_is_ok = !0; 451 spin_lock_init(&priv->lock); 452 if (kfifo_alloc(&priv->write_fifo, CYPRESS_BUF_SIZE, GFP_KERNEL)) { 453 kfree(priv); 454 return -ENOMEM; 455 } 456 init_waitqueue_head(&priv->delta_msr_wait); 457 458 usb_reset_configuration(serial->dev); 459 460 priv->cmd_ctrl = 0; 461 priv->line_control = 0; 462 priv->termios_initialized = 0; 463 priv->rx_flags = 0; 464 /* Default packet format setting is determined by packet size. 465 Anything with a size larger then 9 must have a separate 466 count field since the 3 bit count field is otherwise too 467 small. Otherwise we can use the slightly more compact 468 format. This is in accordance with the cypress_m8 serial 469 converter app note. */ 470 if (port->interrupt_out_size > 9) 471 priv->pkt_fmt = packet_format_1; 472 else 473 priv->pkt_fmt = packet_format_2; 474 475 if (interval > 0) { 476 priv->write_urb_interval = interval; 477 priv->read_urb_interval = interval; 478 dev_dbg(&port->dev, "%s - read & write intervals forced to %d\n", 479 __func__, interval); 480 } else { 481 priv->write_urb_interval = port->interrupt_out_urb->interval; 482 priv->read_urb_interval = port->interrupt_in_urb->interval; 483 dev_dbg(&port->dev, "%s - intervals: read=%d write=%d\n", 484 __func__, priv->read_urb_interval, 485 priv->write_urb_interval); 486 } 487 usb_set_serial_port_data(port, priv); 488 489 return 0; 490 } 491 492 493 static int cypress_earthmate_port_probe(struct usb_serial_port *port) 494 { 495 struct usb_serial *serial = port->serial; 496 struct cypress_private *priv; 497 int ret; 498 499 ret = cypress_generic_port_probe(port); 500 if (ret) { 501 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__); 502 return ret; 503 } 504 505 priv = usb_get_serial_port_data(port); 506 priv->chiptype = CT_EARTHMATE; 507 /* All Earthmate devices use the separated-count packet 508 format! Idiotic. */ 509 priv->pkt_fmt = packet_format_1; 510 if (serial->dev->descriptor.idProduct != 511 cpu_to_le16(PRODUCT_ID_EARTHMATEUSB)) { 512 /* The old original USB Earthmate seemed able to 513 handle GET_CONFIG requests; everything they've 514 produced since that time crashes if this command is 515 attempted :-( */ 516 dev_dbg(&port->dev, 517 "%s - Marking this device as unsafe for GET_CONFIG commands\n", 518 __func__); 519 priv->get_cfg_unsafe = !0; 520 } 521 522 return 0; 523 } 524 525 static int cypress_hidcom_port_probe(struct usb_serial_port *port) 526 { 527 struct cypress_private *priv; 528 int ret; 529 530 ret = cypress_generic_port_probe(port); 531 if (ret) { 532 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__); 533 return ret; 534 } 535 536 priv = usb_get_serial_port_data(port); 537 priv->chiptype = CT_CYPHIDCOM; 538 539 return 0; 540 } 541 542 static int cypress_ca42v2_port_probe(struct usb_serial_port *port) 543 { 544 struct cypress_private *priv; 545 int ret; 546 547 ret = cypress_generic_port_probe(port); 548 if (ret) { 549 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__); 550 return ret; 551 } 552 553 priv = usb_get_serial_port_data(port); 554 priv->chiptype = CT_CA42V2; 555 556 return 0; 557 } 558 559 static int cypress_port_remove(struct usb_serial_port *port) 560 { 561 struct cypress_private *priv; 562 563 priv = usb_get_serial_port_data(port); 564 565 kfifo_free(&priv->write_fifo); 566 kfree(priv); 567 568 return 0; 569 } 570 571 static int cypress_open(struct tty_struct *tty, struct usb_serial_port *port) 572 { 573 struct cypress_private *priv = usb_get_serial_port_data(port); 574 struct usb_serial *serial = port->serial; 575 unsigned long flags; 576 int result = 0; 577 578 if (!priv->comm_is_ok) 579 return -EIO; 580 581 /* clear halts before open */ 582 usb_clear_halt(serial->dev, 0x81); 583 usb_clear_halt(serial->dev, 0x02); 584 585 spin_lock_irqsave(&priv->lock, flags); 586 /* reset read/write statistics */ 587 priv->bytes_in = 0; 588 priv->bytes_out = 0; 589 priv->cmd_count = 0; 590 priv->rx_flags = 0; 591 spin_unlock_irqrestore(&priv->lock, flags); 592 593 /* Set termios */ 594 cypress_send(port); 595 596 if (tty) 597 cypress_set_termios(tty, port, &priv->tmp_termios); 598 599 /* setup the port and start reading from the device */ 600 if (!port->interrupt_in_urb) { 601 dev_err(&port->dev, "%s - interrupt_in_urb is empty!\n", 602 __func__); 603 return -1; 604 } 605 606 usb_fill_int_urb(port->interrupt_in_urb, serial->dev, 607 usb_rcvintpipe(serial->dev, port->interrupt_in_endpointAddress), 608 port->interrupt_in_urb->transfer_buffer, 609 port->interrupt_in_urb->transfer_buffer_length, 610 cypress_read_int_callback, port, priv->read_urb_interval); 611 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); 612 613 if (result) { 614 dev_err(&port->dev, 615 "%s - failed submitting read urb, error %d\n", 616 __func__, result); 617 cypress_set_dead(port); 618 } 619 port->port.drain_delay = 256; 620 return result; 621 } /* cypress_open */ 622 623 static void cypress_dtr_rts(struct usb_serial_port *port, int on) 624 { 625 struct cypress_private *priv = usb_get_serial_port_data(port); 626 /* drop dtr and rts */ 627 spin_lock_irq(&priv->lock); 628 if (on == 0) 629 priv->line_control = 0; 630 else 631 priv->line_control = CONTROL_DTR | CONTROL_RTS; 632 priv->cmd_ctrl = 1; 633 spin_unlock_irq(&priv->lock); 634 cypress_write(NULL, port, NULL, 0); 635 } 636 637 static void cypress_close(struct usb_serial_port *port) 638 { 639 struct cypress_private *priv = usb_get_serial_port_data(port); 640 unsigned long flags; 641 642 /* writing is potentially harmful, lock must be taken */ 643 mutex_lock(&port->serial->disc_mutex); 644 if (port->serial->disconnected) { 645 mutex_unlock(&port->serial->disc_mutex); 646 return; 647 } 648 spin_lock_irqsave(&priv->lock, flags); 649 kfifo_reset_out(&priv->write_fifo); 650 spin_unlock_irqrestore(&priv->lock, flags); 651 652 dev_dbg(&port->dev, "%s - stopping urbs\n", __func__); 653 usb_kill_urb(port->interrupt_in_urb); 654 usb_kill_urb(port->interrupt_out_urb); 655 656 if (stats) 657 dev_info(&port->dev, "Statistics: %d Bytes In | %d Bytes Out | %d Commands Issued\n", 658 priv->bytes_in, priv->bytes_out, priv->cmd_count); 659 mutex_unlock(&port->serial->disc_mutex); 660 } /* cypress_close */ 661 662 663 static int cypress_write(struct tty_struct *tty, struct usb_serial_port *port, 664 const unsigned char *buf, int count) 665 { 666 struct cypress_private *priv = usb_get_serial_port_data(port); 667 668 dev_dbg(&port->dev, "%s - port %d, %d bytes\n", __func__, port->number, count); 669 670 /* line control commands, which need to be executed immediately, 671 are not put into the buffer for obvious reasons. 672 */ 673 if (priv->cmd_ctrl) { 674 count = 0; 675 goto finish; 676 } 677 678 if (!count) 679 return count; 680 681 count = kfifo_in_locked(&priv->write_fifo, buf, count, &priv->lock); 682 683 finish: 684 cypress_send(port); 685 686 return count; 687 } /* cypress_write */ 688 689 690 static void cypress_send(struct usb_serial_port *port) 691 { 692 int count = 0, result, offset, actual_size; 693 struct cypress_private *priv = usb_get_serial_port_data(port); 694 struct device *dev = &port->dev; 695 unsigned long flags; 696 697 if (!priv->comm_is_ok) 698 return; 699 700 dev_dbg(dev, "%s - interrupt out size is %d\n", __func__, 701 port->interrupt_out_size); 702 703 spin_lock_irqsave(&priv->lock, flags); 704 if (priv->write_urb_in_use) { 705 dev_dbg(dev, "%s - can't write, urb in use\n", __func__); 706 spin_unlock_irqrestore(&priv->lock, flags); 707 return; 708 } 709 spin_unlock_irqrestore(&priv->lock, flags); 710 711 /* clear buffer */ 712 memset(port->interrupt_out_urb->transfer_buffer, 0, 713 port->interrupt_out_size); 714 715 spin_lock_irqsave(&priv->lock, flags); 716 switch (priv->pkt_fmt) { 717 default: 718 case packet_format_1: 719 /* this is for the CY7C64013... */ 720 offset = 2; 721 port->interrupt_out_buffer[0] = priv->line_control; 722 break; 723 case packet_format_2: 724 /* this is for the CY7C63743... */ 725 offset = 1; 726 port->interrupt_out_buffer[0] = priv->line_control; 727 break; 728 } 729 730 if (priv->line_control & CONTROL_RESET) 731 priv->line_control &= ~CONTROL_RESET; 732 733 if (priv->cmd_ctrl) { 734 priv->cmd_count++; 735 dev_dbg(dev, "%s - line control command being issued\n", __func__); 736 spin_unlock_irqrestore(&priv->lock, flags); 737 goto send; 738 } else 739 spin_unlock_irqrestore(&priv->lock, flags); 740 741 count = kfifo_out_locked(&priv->write_fifo, 742 &port->interrupt_out_buffer[offset], 743 port->interrupt_out_size - offset, 744 &priv->lock); 745 if (count == 0) 746 return; 747 748 switch (priv->pkt_fmt) { 749 default: 750 case packet_format_1: 751 port->interrupt_out_buffer[1] = count; 752 break; 753 case packet_format_2: 754 port->interrupt_out_buffer[0] |= count; 755 } 756 757 dev_dbg(dev, "%s - count is %d\n", __func__, count); 758 759 send: 760 spin_lock_irqsave(&priv->lock, flags); 761 priv->write_urb_in_use = 1; 762 spin_unlock_irqrestore(&priv->lock, flags); 763 764 if (priv->cmd_ctrl) 765 actual_size = 1; 766 else 767 actual_size = count + 768 (priv->pkt_fmt == packet_format_1 ? 2 : 1); 769 770 usb_serial_debug_data(dev, __func__, port->interrupt_out_size, 771 port->interrupt_out_urb->transfer_buffer); 772 773 usb_fill_int_urb(port->interrupt_out_urb, port->serial->dev, 774 usb_sndintpipe(port->serial->dev, port->interrupt_out_endpointAddress), 775 port->interrupt_out_buffer, port->interrupt_out_size, 776 cypress_write_int_callback, port, priv->write_urb_interval); 777 result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC); 778 if (result) { 779 dev_err_console(port, 780 "%s - failed submitting write urb, error %d\n", 781 __func__, result); 782 priv->write_urb_in_use = 0; 783 cypress_set_dead(port); 784 } 785 786 spin_lock_irqsave(&priv->lock, flags); 787 if (priv->cmd_ctrl) 788 priv->cmd_ctrl = 0; 789 790 /* do not count the line control and size bytes */ 791 priv->bytes_out += count; 792 spin_unlock_irqrestore(&priv->lock, flags); 793 794 usb_serial_port_softint(port); 795 } /* cypress_send */ 796 797 798 /* returns how much space is available in the soft buffer */ 799 static int cypress_write_room(struct tty_struct *tty) 800 { 801 struct usb_serial_port *port = tty->driver_data; 802 struct cypress_private *priv = usb_get_serial_port_data(port); 803 int room = 0; 804 unsigned long flags; 805 806 spin_lock_irqsave(&priv->lock, flags); 807 room = kfifo_avail(&priv->write_fifo); 808 spin_unlock_irqrestore(&priv->lock, flags); 809 810 dev_dbg(&port->dev, "%s - returns %d\n", __func__, room); 811 return room; 812 } 813 814 815 static int cypress_tiocmget(struct tty_struct *tty) 816 { 817 struct usb_serial_port *port = tty->driver_data; 818 struct cypress_private *priv = usb_get_serial_port_data(port); 819 __u8 status, control; 820 unsigned int result = 0; 821 unsigned long flags; 822 823 spin_lock_irqsave(&priv->lock, flags); 824 control = priv->line_control; 825 status = priv->current_status; 826 spin_unlock_irqrestore(&priv->lock, flags); 827 828 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) 829 | ((control & CONTROL_RTS) ? TIOCM_RTS : 0) 830 | ((status & UART_CTS) ? TIOCM_CTS : 0) 831 | ((status & UART_DSR) ? TIOCM_DSR : 0) 832 | ((status & UART_RI) ? TIOCM_RI : 0) 833 | ((status & UART_CD) ? TIOCM_CD : 0); 834 835 dev_dbg(&port->dev, "%s - result = %x\n", __func__, result); 836 837 return result; 838 } 839 840 841 static int cypress_tiocmset(struct tty_struct *tty, 842 unsigned int set, unsigned int clear) 843 { 844 struct usb_serial_port *port = tty->driver_data; 845 struct cypress_private *priv = usb_get_serial_port_data(port); 846 unsigned long flags; 847 848 spin_lock_irqsave(&priv->lock, flags); 849 if (set & TIOCM_RTS) 850 priv->line_control |= CONTROL_RTS; 851 if (set & TIOCM_DTR) 852 priv->line_control |= CONTROL_DTR; 853 if (clear & TIOCM_RTS) 854 priv->line_control &= ~CONTROL_RTS; 855 if (clear & TIOCM_DTR) 856 priv->line_control &= ~CONTROL_DTR; 857 priv->cmd_ctrl = 1; 858 spin_unlock_irqrestore(&priv->lock, flags); 859 860 return cypress_write(tty, port, NULL, 0); 861 } 862 863 864 static int cypress_ioctl(struct tty_struct *tty, 865 unsigned int cmd, unsigned long arg) 866 { 867 struct usb_serial_port *port = tty->driver_data; 868 struct cypress_private *priv = usb_get_serial_port_data(port); 869 870 dev_dbg(&port->dev, "%s - port %d, cmd 0x%.4x\n", __func__, port->number, cmd); 871 872 switch (cmd) { 873 /* This code comes from drivers/char/serial.c and ftdi_sio.c */ 874 case TIOCMIWAIT: 875 while (priv != NULL) { 876 interruptible_sleep_on(&priv->delta_msr_wait); 877 /* see if a signal did it */ 878 if (signal_pending(current)) 879 return -ERESTARTSYS; 880 else { 881 char diff = priv->diff_status; 882 if (diff == 0) 883 return -EIO; /* no change => error */ 884 885 /* consume all events */ 886 priv->diff_status = 0; 887 888 /* return 0 if caller wanted to know about 889 these bits */ 890 if (((arg & TIOCM_RNG) && (diff & UART_RI)) || 891 ((arg & TIOCM_DSR) && (diff & UART_DSR)) || 892 ((arg & TIOCM_CD) && (diff & UART_CD)) || 893 ((arg & TIOCM_CTS) && (diff & UART_CTS))) 894 return 0; 895 /* otherwise caller can't care less about what 896 * happened, and so we continue to wait for 897 * more events. 898 */ 899 } 900 } 901 return 0; 902 default: 903 break; 904 } 905 dev_dbg(&port->dev, "%s - arg not supported - it was 0x%04x - check include/asm/ioctls.h\n", __func__, cmd); 906 return -ENOIOCTLCMD; 907 } /* cypress_ioctl */ 908 909 910 static void cypress_set_termios(struct tty_struct *tty, 911 struct usb_serial_port *port, struct ktermios *old_termios) 912 { 913 struct cypress_private *priv = usb_get_serial_port_data(port); 914 struct device *dev = &port->dev; 915 int data_bits, stop_bits, parity_type, parity_enable; 916 unsigned cflag, iflag; 917 unsigned long flags; 918 __u8 oldlines; 919 int linechange = 0; 920 921 spin_lock_irqsave(&priv->lock, flags); 922 /* We can't clean this one up as we don't know the device type 923 early enough */ 924 if (!priv->termios_initialized) { 925 if (priv->chiptype == CT_EARTHMATE) { 926 tty->termios = tty_std_termios; 927 tty->termios.c_cflag = B4800 | CS8 | CREAD | HUPCL | 928 CLOCAL; 929 tty->termios.c_ispeed = 4800; 930 tty->termios.c_ospeed = 4800; 931 } else if (priv->chiptype == CT_CYPHIDCOM) { 932 tty->termios = tty_std_termios; 933 tty->termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | 934 CLOCAL; 935 tty->termios.c_ispeed = 9600; 936 tty->termios.c_ospeed = 9600; 937 } else if (priv->chiptype == CT_CA42V2) { 938 tty->termios = tty_std_termios; 939 tty->termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | 940 CLOCAL; 941 tty->termios.c_ispeed = 9600; 942 tty->termios.c_ospeed = 9600; 943 } 944 priv->termios_initialized = 1; 945 } 946 spin_unlock_irqrestore(&priv->lock, flags); 947 948 /* Unsupported features need clearing */ 949 tty->termios.c_cflag &= ~(CMSPAR|CRTSCTS); 950 951 cflag = tty->termios.c_cflag; 952 iflag = tty->termios.c_iflag; 953 954 /* check if there are new settings */ 955 if (old_termios) { 956 spin_lock_irqsave(&priv->lock, flags); 957 priv->tmp_termios = tty->termios; 958 spin_unlock_irqrestore(&priv->lock, flags); 959 } 960 961 /* set number of data bits, parity, stop bits */ 962 /* when parity is disabled the parity type bit is ignored */ 963 964 /* 1 means 2 stop bits, 0 means 1 stop bit */ 965 stop_bits = cflag & CSTOPB ? 1 : 0; 966 967 if (cflag & PARENB) { 968 parity_enable = 1; 969 /* 1 means odd parity, 0 means even parity */ 970 parity_type = cflag & PARODD ? 1 : 0; 971 } else 972 parity_enable = parity_type = 0; 973 974 switch (cflag & CSIZE) { 975 case CS5: 976 data_bits = 0; 977 break; 978 case CS6: 979 data_bits = 1; 980 break; 981 case CS7: 982 data_bits = 2; 983 break; 984 case CS8: 985 data_bits = 3; 986 break; 987 default: 988 dev_err(dev, "%s - CSIZE was set, but not CS5-CS8\n", __func__); 989 data_bits = 3; 990 } 991 spin_lock_irqsave(&priv->lock, flags); 992 oldlines = priv->line_control; 993 if ((cflag & CBAUD) == B0) { 994 /* drop dtr and rts */ 995 dev_dbg(dev, "%s - dropping the lines, baud rate 0bps\n", __func__); 996 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS); 997 } else 998 priv->line_control = (CONTROL_DTR | CONTROL_RTS); 999 spin_unlock_irqrestore(&priv->lock, flags); 1000 1001 dev_dbg(dev, "%s - sending %d stop_bits, %d parity_enable, %d parity_type, %d data_bits (+5)\n", 1002 __func__, stop_bits, parity_enable, parity_type, data_bits); 1003 1004 cypress_serial_control(tty, port, tty_get_baud_rate(tty), 1005 data_bits, stop_bits, 1006 parity_enable, parity_type, 1007 0, CYPRESS_SET_CONFIG); 1008 1009 /* we perform a CYPRESS_GET_CONFIG so that the current settings are 1010 * filled into the private structure this should confirm that all is 1011 * working if it returns what we just set */ 1012 cypress_serial_control(tty, port, 0, 0, 0, 0, 0, 0, CYPRESS_GET_CONFIG); 1013 1014 /* Here we can define custom tty settings for devices; the main tty 1015 * termios flag base comes from empeg.c */ 1016 1017 spin_lock_irqsave(&priv->lock, flags); 1018 if (priv->chiptype == CT_EARTHMATE && priv->baud_rate == 4800) { 1019 dev_dbg(dev, "Using custom termios settings for a baud rate of 4800bps.\n"); 1020 /* define custom termios settings for NMEA protocol */ 1021 1022 tty->termios.c_iflag /* input modes - */ 1023 &= ~(IGNBRK /* disable ignore break */ 1024 | BRKINT /* disable break causes interrupt */ 1025 | PARMRK /* disable mark parity errors */ 1026 | ISTRIP /* disable clear high bit of input char */ 1027 | INLCR /* disable translate NL to CR */ 1028 | IGNCR /* disable ignore CR */ 1029 | ICRNL /* disable translate CR to NL */ 1030 | IXON); /* disable enable XON/XOFF flow control */ 1031 1032 tty->termios.c_oflag /* output modes */ 1033 &= ~OPOST; /* disable postprocess output char */ 1034 1035 tty->termios.c_lflag /* line discipline modes */ 1036 &= ~(ECHO /* disable echo input characters */ 1037 | ECHONL /* disable echo new line */ 1038 | ICANON /* disable erase, kill, werase, and rprnt 1039 special characters */ 1040 | ISIG /* disable interrupt, quit, and suspend 1041 special characters */ 1042 | IEXTEN); /* disable non-POSIX special characters */ 1043 } /* CT_CYPHIDCOM: Application should handle this for device */ 1044 1045 linechange = (priv->line_control != oldlines); 1046 spin_unlock_irqrestore(&priv->lock, flags); 1047 1048 /* if necessary, set lines */ 1049 if (linechange) { 1050 priv->cmd_ctrl = 1; 1051 cypress_write(tty, port, NULL, 0); 1052 } 1053 } /* cypress_set_termios */ 1054 1055 1056 /* returns amount of data still left in soft buffer */ 1057 static int cypress_chars_in_buffer(struct tty_struct *tty) 1058 { 1059 struct usb_serial_port *port = tty->driver_data; 1060 struct cypress_private *priv = usb_get_serial_port_data(port); 1061 int chars = 0; 1062 unsigned long flags; 1063 1064 spin_lock_irqsave(&priv->lock, flags); 1065 chars = kfifo_len(&priv->write_fifo); 1066 spin_unlock_irqrestore(&priv->lock, flags); 1067 1068 dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars); 1069 return chars; 1070 } 1071 1072 1073 static void cypress_throttle(struct tty_struct *tty) 1074 { 1075 struct usb_serial_port *port = tty->driver_data; 1076 struct cypress_private *priv = usb_get_serial_port_data(port); 1077 1078 spin_lock_irq(&priv->lock); 1079 priv->rx_flags = THROTTLED; 1080 spin_unlock_irq(&priv->lock); 1081 } 1082 1083 1084 static void cypress_unthrottle(struct tty_struct *tty) 1085 { 1086 struct usb_serial_port *port = tty->driver_data; 1087 struct cypress_private *priv = usb_get_serial_port_data(port); 1088 int actually_throttled, result; 1089 1090 spin_lock_irq(&priv->lock); 1091 actually_throttled = priv->rx_flags & ACTUALLY_THROTTLED; 1092 priv->rx_flags = 0; 1093 spin_unlock_irq(&priv->lock); 1094 1095 if (!priv->comm_is_ok) 1096 return; 1097 1098 if (actually_throttled) { 1099 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); 1100 if (result) { 1101 dev_err(&port->dev, "%s - failed submitting read urb, " 1102 "error %d\n", __func__, result); 1103 cypress_set_dead(port); 1104 } 1105 } 1106 } 1107 1108 1109 static void cypress_read_int_callback(struct urb *urb) 1110 { 1111 struct usb_serial_port *port = urb->context; 1112 struct cypress_private *priv = usb_get_serial_port_data(port); 1113 struct device *dev = &urb->dev->dev; 1114 struct tty_struct *tty; 1115 unsigned char *data = urb->transfer_buffer; 1116 unsigned long flags; 1117 char tty_flag = TTY_NORMAL; 1118 int havedata = 0; 1119 int bytes = 0; 1120 int result; 1121 int i = 0; 1122 int status = urb->status; 1123 1124 switch (status) { 1125 case 0: /* success */ 1126 break; 1127 case -ECONNRESET: 1128 case -ENOENT: 1129 case -ESHUTDOWN: 1130 /* precursor to disconnect so just go away */ 1131 return; 1132 case -EPIPE: 1133 /* Can't call usb_clear_halt while in_interrupt */ 1134 /* FALLS THROUGH */ 1135 default: 1136 /* something ugly is going on... */ 1137 dev_err(dev, "%s - unexpected nonzero read status received: %d\n", 1138 __func__, status); 1139 cypress_set_dead(port); 1140 return; 1141 } 1142 1143 spin_lock_irqsave(&priv->lock, flags); 1144 if (priv->rx_flags & THROTTLED) { 1145 dev_dbg(dev, "%s - now throttling\n", __func__); 1146 priv->rx_flags |= ACTUALLY_THROTTLED; 1147 spin_unlock_irqrestore(&priv->lock, flags); 1148 return; 1149 } 1150 spin_unlock_irqrestore(&priv->lock, flags); 1151 1152 tty = tty_port_tty_get(&port->port); 1153 if (!tty) { 1154 dev_dbg(dev, "%s - bad tty pointer - exiting\n", __func__); 1155 return; 1156 } 1157 1158 spin_lock_irqsave(&priv->lock, flags); 1159 result = urb->actual_length; 1160 switch (priv->pkt_fmt) { 1161 default: 1162 case packet_format_1: 1163 /* This is for the CY7C64013... */ 1164 priv->current_status = data[0] & 0xF8; 1165 bytes = data[1] + 2; 1166 i = 2; 1167 if (bytes > 2) 1168 havedata = 1; 1169 break; 1170 case packet_format_2: 1171 /* This is for the CY7C63743... */ 1172 priv->current_status = data[0] & 0xF8; 1173 bytes = (data[0] & 0x07) + 1; 1174 i = 1; 1175 if (bytes > 1) 1176 havedata = 1; 1177 break; 1178 } 1179 spin_unlock_irqrestore(&priv->lock, flags); 1180 if (result < bytes) { 1181 dev_dbg(dev, 1182 "%s - wrong packet size - received %d bytes but packet said %d bytes\n", 1183 __func__, result, bytes); 1184 goto continue_read; 1185 } 1186 1187 usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data); 1188 1189 spin_lock_irqsave(&priv->lock, flags); 1190 /* check to see if status has changed */ 1191 if (priv->current_status != priv->prev_status) { 1192 priv->diff_status |= priv->current_status ^ 1193 priv->prev_status; 1194 wake_up_interruptible(&priv->delta_msr_wait); 1195 priv->prev_status = priv->current_status; 1196 } 1197 spin_unlock_irqrestore(&priv->lock, flags); 1198 1199 /* hangup, as defined in acm.c... this might be a bad place for it 1200 * though */ 1201 if (tty && !(tty->termios.c_cflag & CLOCAL) && 1202 !(priv->current_status & UART_CD)) { 1203 dev_dbg(dev, "%s - calling hangup\n", __func__); 1204 tty_hangup(tty); 1205 goto continue_read; 1206 } 1207 1208 /* There is one error bit... I'm assuming it is a parity error 1209 * indicator as the generic firmware will set this bit to 1 if a 1210 * parity error occurs. 1211 * I can not find reference to any other error events. */ 1212 spin_lock_irqsave(&priv->lock, flags); 1213 if (priv->current_status & CYP_ERROR) { 1214 spin_unlock_irqrestore(&priv->lock, flags); 1215 tty_flag = TTY_PARITY; 1216 dev_dbg(dev, "%s - Parity Error detected\n", __func__); 1217 } else 1218 spin_unlock_irqrestore(&priv->lock, flags); 1219 1220 /* process read if there is data other than line status */ 1221 if (tty && bytes > i) { 1222 tty_insert_flip_string_fixed_flag(tty, data + i, 1223 tty_flag, bytes - i); 1224 tty_flip_buffer_push(tty); 1225 } 1226 1227 spin_lock_irqsave(&priv->lock, flags); 1228 /* control and status byte(s) are also counted */ 1229 priv->bytes_in += bytes; 1230 spin_unlock_irqrestore(&priv->lock, flags); 1231 1232 continue_read: 1233 tty_kref_put(tty); 1234 1235 /* Continue trying to always read */ 1236 1237 if (priv->comm_is_ok) { 1238 usb_fill_int_urb(port->interrupt_in_urb, port->serial->dev, 1239 usb_rcvintpipe(port->serial->dev, 1240 port->interrupt_in_endpointAddress), 1241 port->interrupt_in_urb->transfer_buffer, 1242 port->interrupt_in_urb->transfer_buffer_length, 1243 cypress_read_int_callback, port, 1244 priv->read_urb_interval); 1245 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC); 1246 if (result && result != -EPERM) { 1247 dev_err(dev, "%s - failed resubmitting read urb, error %d\n", 1248 __func__, result); 1249 cypress_set_dead(port); 1250 } 1251 } 1252 } /* cypress_read_int_callback */ 1253 1254 1255 static void cypress_write_int_callback(struct urb *urb) 1256 { 1257 struct usb_serial_port *port = urb->context; 1258 struct cypress_private *priv = usb_get_serial_port_data(port); 1259 struct device *dev = &urb->dev->dev; 1260 int result; 1261 int status = urb->status; 1262 1263 switch (status) { 1264 case 0: 1265 /* success */ 1266 break; 1267 case -ECONNRESET: 1268 case -ENOENT: 1269 case -ESHUTDOWN: 1270 /* this urb is terminated, clean up */ 1271 dev_dbg(dev, "%s - urb shutting down with status: %d\n", 1272 __func__, status); 1273 priv->write_urb_in_use = 0; 1274 return; 1275 case -EPIPE: /* no break needed; clear halt and resubmit */ 1276 if (!priv->comm_is_ok) 1277 break; 1278 usb_clear_halt(port->serial->dev, 0x02); 1279 /* error in the urb, so we have to resubmit it */ 1280 dev_dbg(dev, "%s - nonzero write bulk status received: %d\n", 1281 __func__, status); 1282 port->interrupt_out_urb->transfer_buffer_length = 1; 1283 result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC); 1284 if (!result) 1285 return; 1286 dev_err(dev, "%s - failed resubmitting write urb, error %d\n", 1287 __func__, result); 1288 cypress_set_dead(port); 1289 break; 1290 default: 1291 dev_err(dev, "%s - unexpected nonzero write status received: %d\n", 1292 __func__, status); 1293 cypress_set_dead(port); 1294 break; 1295 } 1296 priv->write_urb_in_use = 0; 1297 1298 /* send any buffered data */ 1299 cypress_send(port); 1300 } 1301 1302 module_usb_serial_driver(serial_drivers, id_table_combined); 1303 1304 MODULE_AUTHOR(DRIVER_AUTHOR); 1305 MODULE_DESCRIPTION(DRIVER_DESC); 1306 MODULE_VERSION(DRIVER_VERSION); 1307 MODULE_LICENSE("GPL"); 1308 1309 module_param(stats, bool, S_IRUGO | S_IWUSR); 1310 MODULE_PARM_DESC(stats, "Enable statistics or not"); 1311 module_param(interval, int, S_IRUGO | S_IWUSR); 1312 MODULE_PARM_DESC(interval, "Overrides interrupt interval"); 1313 module_param(unstable_bauds, bool, S_IRUGO | S_IWUSR); 1314 MODULE_PARM_DESC(unstable_bauds, "Allow unstable baud rates"); 1315