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 #define DRIVER_AUTHOR "Lonnie Mendez <dignome@gmail.com>, Neil Whelchel <koyama@firstlight.net>" 54 #define DRIVER_DESC "Cypress USB to Serial Driver" 55 56 /* write buffer size defines */ 57 #define CYPRESS_BUF_SIZE 1024 58 59 static const struct usb_device_id id_table_earthmate[] = { 60 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) }, 61 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) }, 62 { } /* Terminating entry */ 63 }; 64 65 static const struct usb_device_id id_table_cyphidcomrs232[] = { 66 { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) }, 67 { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) }, 68 { USB_DEVICE(VENDOR_ID_FRWD, PRODUCT_ID_CYPHIDCOM_FRWD) }, 69 { } /* Terminating entry */ 70 }; 71 72 static const struct usb_device_id id_table_nokiaca42v2[] = { 73 { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) }, 74 { } /* Terminating entry */ 75 }; 76 77 static const struct usb_device_id id_table_combined[] = { 78 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) }, 79 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) }, 80 { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) }, 81 { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) }, 82 { USB_DEVICE(VENDOR_ID_FRWD, PRODUCT_ID_CYPHIDCOM_FRWD) }, 83 { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) }, 84 { } /* Terminating entry */ 85 }; 86 87 MODULE_DEVICE_TABLE(usb, id_table_combined); 88 89 enum packet_format { 90 packet_format_1, /* b0:status, b1:payload count */ 91 packet_format_2 /* b0[7:3]:status, b0[2:0]:payload count */ 92 }; 93 94 struct cypress_private { 95 spinlock_t lock; /* private lock */ 96 int chiptype; /* identifier of device, for quirks/etc */ 97 int bytes_in; /* used for statistics */ 98 int bytes_out; /* used for statistics */ 99 int cmd_count; /* used for statistics */ 100 int cmd_ctrl; /* always set this to 1 before issuing a command */ 101 struct kfifo write_fifo; /* write fifo */ 102 int write_urb_in_use; /* write urb in use indicator */ 103 int write_urb_interval; /* interval to use for write urb */ 104 int read_urb_interval; /* interval to use for read urb */ 105 int comm_is_ok; /* true if communication is (still) ok */ 106 int termios_initialized; 107 __u8 line_control; /* holds dtr / rts value */ 108 __u8 current_status; /* received from last read - info on dsr,cts,cd,ri,etc */ 109 __u8 current_config; /* stores the current configuration byte */ 110 __u8 rx_flags; /* throttling - used from whiteheat/ftdi_sio */ 111 enum packet_format pkt_fmt; /* format to use for packet send / receive */ 112 int get_cfg_unsafe; /* If true, the CYPRESS_GET_CONFIG is unsafe */ 113 int baud_rate; /* stores current baud rate in 114 integer form */ 115 int isthrottled; /* if throttled, discard reads */ 116 char prev_status, diff_status; /* used for TIOCMIWAIT */ 117 /* we pass a pointer to this as the argument sent to 118 cypress_set_termios old_termios */ 119 struct ktermios tmp_termios; /* stores the old termios settings */ 120 }; 121 122 /* function prototypes for the Cypress USB to serial device */ 123 static int cypress_earthmate_port_probe(struct usb_serial_port *port); 124 static int cypress_hidcom_port_probe(struct usb_serial_port *port); 125 static int cypress_ca42v2_port_probe(struct usb_serial_port *port); 126 static int cypress_port_remove(struct usb_serial_port *port); 127 static int cypress_open(struct tty_struct *tty, struct usb_serial_port *port); 128 static void cypress_close(struct usb_serial_port *port); 129 static void cypress_dtr_rts(struct usb_serial_port *port, int on); 130 static int cypress_write(struct tty_struct *tty, struct usb_serial_port *port, 131 const unsigned char *buf, int count); 132 static void cypress_send(struct usb_serial_port *port); 133 static int cypress_write_room(struct tty_struct *tty); 134 static void cypress_set_termios(struct tty_struct *tty, 135 struct usb_serial_port *port, struct ktermios *old); 136 static int cypress_tiocmget(struct tty_struct *tty); 137 static int cypress_tiocmset(struct tty_struct *tty, 138 unsigned int set, unsigned int clear); 139 static int cypress_tiocmiwait(struct tty_struct *tty, unsigned long arg); 140 static int cypress_chars_in_buffer(struct tty_struct *tty); 141 static void cypress_throttle(struct tty_struct *tty); 142 static void cypress_unthrottle(struct tty_struct *tty); 143 static void cypress_set_dead(struct usb_serial_port *port); 144 static void cypress_read_int_callback(struct urb *urb); 145 static void cypress_write_int_callback(struct urb *urb); 146 147 static struct usb_serial_driver cypress_earthmate_device = { 148 .driver = { 149 .owner = THIS_MODULE, 150 .name = "earthmate", 151 }, 152 .description = "DeLorme Earthmate USB", 153 .id_table = id_table_earthmate, 154 .num_ports = 1, 155 .port_probe = cypress_earthmate_port_probe, 156 .port_remove = cypress_port_remove, 157 .open = cypress_open, 158 .close = cypress_close, 159 .dtr_rts = cypress_dtr_rts, 160 .write = cypress_write, 161 .write_room = cypress_write_room, 162 .set_termios = cypress_set_termios, 163 .tiocmget = cypress_tiocmget, 164 .tiocmset = cypress_tiocmset, 165 .tiocmiwait = cypress_tiocmiwait, 166 .chars_in_buffer = cypress_chars_in_buffer, 167 .throttle = cypress_throttle, 168 .unthrottle = cypress_unthrottle, 169 .read_int_callback = cypress_read_int_callback, 170 .write_int_callback = cypress_write_int_callback, 171 }; 172 173 static struct usb_serial_driver cypress_hidcom_device = { 174 .driver = { 175 .owner = THIS_MODULE, 176 .name = "cyphidcom", 177 }, 178 .description = "HID->COM RS232 Adapter", 179 .id_table = id_table_cyphidcomrs232, 180 .num_ports = 1, 181 .port_probe = cypress_hidcom_port_probe, 182 .port_remove = cypress_port_remove, 183 .open = cypress_open, 184 .close = cypress_close, 185 .dtr_rts = cypress_dtr_rts, 186 .write = cypress_write, 187 .write_room = cypress_write_room, 188 .set_termios = cypress_set_termios, 189 .tiocmget = cypress_tiocmget, 190 .tiocmset = cypress_tiocmset, 191 .tiocmiwait = cypress_tiocmiwait, 192 .chars_in_buffer = cypress_chars_in_buffer, 193 .throttle = cypress_throttle, 194 .unthrottle = cypress_unthrottle, 195 .read_int_callback = cypress_read_int_callback, 196 .write_int_callback = cypress_write_int_callback, 197 }; 198 199 static struct usb_serial_driver cypress_ca42v2_device = { 200 .driver = { 201 .owner = THIS_MODULE, 202 .name = "nokiaca42v2", 203 }, 204 .description = "Nokia CA-42 V2 Adapter", 205 .id_table = id_table_nokiaca42v2, 206 .num_ports = 1, 207 .port_probe = cypress_ca42v2_port_probe, 208 .port_remove = cypress_port_remove, 209 .open = cypress_open, 210 .close = cypress_close, 211 .dtr_rts = cypress_dtr_rts, 212 .write = cypress_write, 213 .write_room = cypress_write_room, 214 .set_termios = cypress_set_termios, 215 .tiocmget = cypress_tiocmget, 216 .tiocmset = cypress_tiocmset, 217 .tiocmiwait = cypress_tiocmiwait, 218 .chars_in_buffer = cypress_chars_in_buffer, 219 .throttle = cypress_throttle, 220 .unthrottle = cypress_unthrottle, 221 .read_int_callback = cypress_read_int_callback, 222 .write_int_callback = cypress_write_int_callback, 223 }; 224 225 static struct usb_serial_driver * const serial_drivers[] = { 226 &cypress_earthmate_device, &cypress_hidcom_device, 227 &cypress_ca42v2_device, NULL 228 }; 229 230 /***************************************************************************** 231 * Cypress serial helper functions 232 *****************************************************************************/ 233 234 /* FRWD Dongle hidcom needs to skip reset and speed checks */ 235 static inline bool is_frwd(struct usb_device *dev) 236 { 237 return ((le16_to_cpu(dev->descriptor.idVendor) == VENDOR_ID_FRWD) && 238 (le16_to_cpu(dev->descriptor.idProduct) == PRODUCT_ID_CYPHIDCOM_FRWD)); 239 } 240 241 static int analyze_baud_rate(struct usb_serial_port *port, speed_t new_rate) 242 { 243 struct cypress_private *priv; 244 priv = usb_get_serial_port_data(port); 245 246 if (unstable_bauds) 247 return new_rate; 248 249 /* FRWD Dongle uses 115200 bps */ 250 if (is_frwd(port->serial->dev)) 251 return new_rate; 252 253 /* 254 * The general purpose firmware for the Cypress M8 allows for 255 * a maximum speed of 57600bps (I have no idea whether DeLorme 256 * chose to use the general purpose firmware or not), if you 257 * need to modify this speed setting for your own project 258 * please add your own chiptype and modify the code likewise. 259 * The Cypress HID->COM device will work successfully up to 260 * 115200bps (but the actual throughput is around 3kBps). 261 */ 262 if (port->serial->dev->speed == USB_SPEED_LOW) { 263 /* 264 * Mike Isely <isely@pobox.com> 2-Feb-2008: The 265 * Cypress app note that describes this mechanism 266 * states the the low-speed part can't handle more 267 * than 800 bytes/sec, in which case 4800 baud is the 268 * safest speed for a part like that. 269 */ 270 if (new_rate > 4800) { 271 dev_dbg(&port->dev, 272 "%s - failed setting baud rate, device incapable speed %d\n", 273 __func__, new_rate); 274 return -1; 275 } 276 } 277 switch (priv->chiptype) { 278 case CT_EARTHMATE: 279 if (new_rate <= 600) { 280 /* 300 and 600 baud rates are supported under 281 * the generic firmware, but are not used with 282 * NMEA and SiRF protocols */ 283 dev_dbg(&port->dev, 284 "%s - failed setting baud rate, unsupported speed of %d on Earthmate GPS", 285 __func__, new_rate); 286 return -1; 287 } 288 break; 289 default: 290 break; 291 } 292 return new_rate; 293 } 294 295 296 /* This function can either set or retrieve the current serial line settings */ 297 static int cypress_serial_control(struct tty_struct *tty, 298 struct usb_serial_port *port, speed_t baud_rate, int data_bits, 299 int stop_bits, int parity_enable, int parity_type, int reset, 300 int cypress_request_type) 301 { 302 int new_baudrate = 0, retval = 0, tries = 0; 303 struct cypress_private *priv; 304 struct device *dev = &port->dev; 305 u8 *feature_buffer; 306 const unsigned int feature_len = 5; 307 unsigned long flags; 308 309 priv = usb_get_serial_port_data(port); 310 311 if (!priv->comm_is_ok) 312 return -ENODEV; 313 314 feature_buffer = kcalloc(feature_len, sizeof(u8), GFP_KERNEL); 315 if (!feature_buffer) 316 return -ENOMEM; 317 318 switch (cypress_request_type) { 319 case CYPRESS_SET_CONFIG: 320 /* 0 means 'Hang up' so doesn't change the true bit rate */ 321 new_baudrate = priv->baud_rate; 322 if (baud_rate && baud_rate != priv->baud_rate) { 323 dev_dbg(dev, "%s - baud rate is changing\n", __func__); 324 retval = analyze_baud_rate(port, baud_rate); 325 if (retval >= 0) { 326 new_baudrate = retval; 327 dev_dbg(dev, "%s - New baud rate set to %d\n", 328 __func__, new_baudrate); 329 } 330 } 331 dev_dbg(dev, "%s - baud rate is being sent as %d\n", __func__, 332 new_baudrate); 333 334 /* fill the feature_buffer with new configuration */ 335 put_unaligned_le32(new_baudrate, feature_buffer); 336 feature_buffer[4] |= data_bits; /* assign data bits in 2 bit space ( max 3 ) */ 337 /* 1 bit gap */ 338 feature_buffer[4] |= (stop_bits << 3); /* assign stop bits in 1 bit space */ 339 feature_buffer[4] |= (parity_enable << 4); /* assign parity flag in 1 bit space */ 340 feature_buffer[4] |= (parity_type << 5); /* assign parity type in 1 bit space */ 341 /* 1 bit gap */ 342 feature_buffer[4] |= (reset << 7); /* assign reset at end of byte, 1 bit space */ 343 344 dev_dbg(dev, "%s - device is being sent this feature report:\n", __func__); 345 dev_dbg(dev, "%s - %02X - %02X - %02X - %02X - %02X\n", __func__, 346 feature_buffer[0], feature_buffer[1], 347 feature_buffer[2], feature_buffer[3], 348 feature_buffer[4]); 349 350 do { 351 retval = usb_control_msg(port->serial->dev, 352 usb_sndctrlpipe(port->serial->dev, 0), 353 HID_REQ_SET_REPORT, 354 USB_DIR_OUT | USB_RECIP_INTERFACE | USB_TYPE_CLASS, 355 0x0300, 0, feature_buffer, 356 feature_len, 500); 357 358 if (tries++ >= 3) 359 break; 360 361 } while (retval != feature_len && 362 retval != -ENODEV); 363 364 if (retval != feature_len) { 365 dev_err(dev, "%s - failed sending serial line settings - %d\n", 366 __func__, retval); 367 cypress_set_dead(port); 368 } else { 369 spin_lock_irqsave(&priv->lock, flags); 370 priv->baud_rate = new_baudrate; 371 priv->current_config = feature_buffer[4]; 372 spin_unlock_irqrestore(&priv->lock, flags); 373 /* If we asked for a speed change encode it */ 374 if (baud_rate) 375 tty_encode_baud_rate(tty, 376 new_baudrate, new_baudrate); 377 } 378 break; 379 case CYPRESS_GET_CONFIG: 380 if (priv->get_cfg_unsafe) { 381 /* Not implemented for this device, 382 and if we try to do it we're likely 383 to crash the hardware. */ 384 retval = -ENOTTY; 385 goto out; 386 } 387 dev_dbg(dev, "%s - retreiving serial line settings\n", __func__); 388 do { 389 retval = usb_control_msg(port->serial->dev, 390 usb_rcvctrlpipe(port->serial->dev, 0), 391 HID_REQ_GET_REPORT, 392 USB_DIR_IN | USB_RECIP_INTERFACE | USB_TYPE_CLASS, 393 0x0300, 0, feature_buffer, 394 feature_len, 500); 395 396 if (tries++ >= 3) 397 break; 398 } while (retval != feature_len 399 && retval != -ENODEV); 400 401 if (retval != feature_len) { 402 dev_err(dev, "%s - failed to retrieve serial line settings - %d\n", 403 __func__, retval); 404 cypress_set_dead(port); 405 goto out; 406 } else { 407 spin_lock_irqsave(&priv->lock, flags); 408 /* store the config in one byte, and later 409 use bit masks to check values */ 410 priv->current_config = feature_buffer[4]; 411 priv->baud_rate = get_unaligned_le32(feature_buffer); 412 spin_unlock_irqrestore(&priv->lock, flags); 413 } 414 } 415 spin_lock_irqsave(&priv->lock, flags); 416 ++priv->cmd_count; 417 spin_unlock_irqrestore(&priv->lock, flags); 418 out: 419 kfree(feature_buffer); 420 return retval; 421 } /* cypress_serial_control */ 422 423 424 static void cypress_set_dead(struct usb_serial_port *port) 425 { 426 struct cypress_private *priv = usb_get_serial_port_data(port); 427 unsigned long flags; 428 429 spin_lock_irqsave(&priv->lock, flags); 430 if (!priv->comm_is_ok) { 431 spin_unlock_irqrestore(&priv->lock, flags); 432 return; 433 } 434 priv->comm_is_ok = 0; 435 spin_unlock_irqrestore(&priv->lock, flags); 436 437 dev_err(&port->dev, "cypress_m8 suspending failing port %d - " 438 "interval might be too short\n", port->number); 439 } 440 441 442 /***************************************************************************** 443 * Cypress serial driver functions 444 *****************************************************************************/ 445 446 447 static int cypress_generic_port_probe(struct usb_serial_port *port) 448 { 449 struct usb_serial *serial = port->serial; 450 struct cypress_private *priv; 451 452 priv = kzalloc(sizeof(struct cypress_private), GFP_KERNEL); 453 if (!priv) 454 return -ENOMEM; 455 456 priv->comm_is_ok = !0; 457 spin_lock_init(&priv->lock); 458 if (kfifo_alloc(&priv->write_fifo, CYPRESS_BUF_SIZE, GFP_KERNEL)) { 459 kfree(priv); 460 return -ENOMEM; 461 } 462 463 /* Skip reset for FRWD device. It is a workaound: 464 device hangs if it receives SET_CONFIGURE in Configured 465 state. */ 466 if (!is_frwd(serial->dev)) 467 usb_reset_configuration(serial->dev); 468 469 priv->cmd_ctrl = 0; 470 priv->line_control = 0; 471 priv->termios_initialized = 0; 472 priv->rx_flags = 0; 473 /* Default packet format setting is determined by packet size. 474 Anything with a size larger then 9 must have a separate 475 count field since the 3 bit count field is otherwise too 476 small. Otherwise we can use the slightly more compact 477 format. This is in accordance with the cypress_m8 serial 478 converter app note. */ 479 if (port->interrupt_out_size > 9) 480 priv->pkt_fmt = packet_format_1; 481 else 482 priv->pkt_fmt = packet_format_2; 483 484 if (interval > 0) { 485 priv->write_urb_interval = interval; 486 priv->read_urb_interval = interval; 487 dev_dbg(&port->dev, "%s - read & write intervals forced to %d\n", 488 __func__, interval); 489 } else { 490 priv->write_urb_interval = port->interrupt_out_urb->interval; 491 priv->read_urb_interval = port->interrupt_in_urb->interval; 492 dev_dbg(&port->dev, "%s - intervals: read=%d write=%d\n", 493 __func__, priv->read_urb_interval, 494 priv->write_urb_interval); 495 } 496 usb_set_serial_port_data(port, priv); 497 498 return 0; 499 } 500 501 502 static int cypress_earthmate_port_probe(struct usb_serial_port *port) 503 { 504 struct usb_serial *serial = port->serial; 505 struct cypress_private *priv; 506 int ret; 507 508 ret = cypress_generic_port_probe(port); 509 if (ret) { 510 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__); 511 return ret; 512 } 513 514 priv = usb_get_serial_port_data(port); 515 priv->chiptype = CT_EARTHMATE; 516 /* All Earthmate devices use the separated-count packet 517 format! Idiotic. */ 518 priv->pkt_fmt = packet_format_1; 519 if (serial->dev->descriptor.idProduct != 520 cpu_to_le16(PRODUCT_ID_EARTHMATEUSB)) { 521 /* The old original USB Earthmate seemed able to 522 handle GET_CONFIG requests; everything they've 523 produced since that time crashes if this command is 524 attempted :-( */ 525 dev_dbg(&port->dev, 526 "%s - Marking this device as unsafe for GET_CONFIG commands\n", 527 __func__); 528 priv->get_cfg_unsafe = !0; 529 } 530 531 return 0; 532 } 533 534 static int cypress_hidcom_port_probe(struct usb_serial_port *port) 535 { 536 struct cypress_private *priv; 537 int ret; 538 539 ret = cypress_generic_port_probe(port); 540 if (ret) { 541 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__); 542 return ret; 543 } 544 545 priv = usb_get_serial_port_data(port); 546 priv->chiptype = CT_CYPHIDCOM; 547 548 return 0; 549 } 550 551 static int cypress_ca42v2_port_probe(struct usb_serial_port *port) 552 { 553 struct cypress_private *priv; 554 int ret; 555 556 ret = cypress_generic_port_probe(port); 557 if (ret) { 558 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__); 559 return ret; 560 } 561 562 priv = usb_get_serial_port_data(port); 563 priv->chiptype = CT_CA42V2; 564 565 return 0; 566 } 567 568 static int cypress_port_remove(struct usb_serial_port *port) 569 { 570 struct cypress_private *priv; 571 572 priv = usb_get_serial_port_data(port); 573 574 kfifo_free(&priv->write_fifo); 575 kfree(priv); 576 577 return 0; 578 } 579 580 static int cypress_open(struct tty_struct *tty, struct usb_serial_port *port) 581 { 582 struct cypress_private *priv = usb_get_serial_port_data(port); 583 struct usb_serial *serial = port->serial; 584 unsigned long flags; 585 int result = 0; 586 587 if (!priv->comm_is_ok) 588 return -EIO; 589 590 /* clear halts before open */ 591 usb_clear_halt(serial->dev, 0x81); 592 usb_clear_halt(serial->dev, 0x02); 593 594 spin_lock_irqsave(&priv->lock, flags); 595 /* reset read/write statistics */ 596 priv->bytes_in = 0; 597 priv->bytes_out = 0; 598 priv->cmd_count = 0; 599 priv->rx_flags = 0; 600 spin_unlock_irqrestore(&priv->lock, flags); 601 602 /* Set termios */ 603 cypress_send(port); 604 605 if (tty) 606 cypress_set_termios(tty, port, &priv->tmp_termios); 607 608 /* setup the port and start reading from the device */ 609 if (!port->interrupt_in_urb) { 610 dev_err(&port->dev, "%s - interrupt_in_urb is empty!\n", 611 __func__); 612 return -1; 613 } 614 615 usb_fill_int_urb(port->interrupt_in_urb, serial->dev, 616 usb_rcvintpipe(serial->dev, port->interrupt_in_endpointAddress), 617 port->interrupt_in_urb->transfer_buffer, 618 port->interrupt_in_urb->transfer_buffer_length, 619 cypress_read_int_callback, port, priv->read_urb_interval); 620 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); 621 622 if (result) { 623 dev_err(&port->dev, 624 "%s - failed submitting read urb, error %d\n", 625 __func__, result); 626 cypress_set_dead(port); 627 } 628 port->port.drain_delay = 256; 629 return result; 630 } /* cypress_open */ 631 632 static void cypress_dtr_rts(struct usb_serial_port *port, int on) 633 { 634 struct cypress_private *priv = usb_get_serial_port_data(port); 635 /* drop dtr and rts */ 636 spin_lock_irq(&priv->lock); 637 if (on == 0) 638 priv->line_control = 0; 639 else 640 priv->line_control = CONTROL_DTR | CONTROL_RTS; 641 priv->cmd_ctrl = 1; 642 spin_unlock_irq(&priv->lock); 643 cypress_write(NULL, port, NULL, 0); 644 } 645 646 static void cypress_close(struct usb_serial_port *port) 647 { 648 struct cypress_private *priv = usb_get_serial_port_data(port); 649 unsigned long flags; 650 651 spin_lock_irqsave(&priv->lock, flags); 652 kfifo_reset_out(&priv->write_fifo); 653 spin_unlock_irqrestore(&priv->lock, flags); 654 655 dev_dbg(&port->dev, "%s - stopping urbs\n", __func__); 656 usb_kill_urb(port->interrupt_in_urb); 657 usb_kill_urb(port->interrupt_out_urb); 658 659 if (stats) 660 dev_info(&port->dev, "Statistics: %d Bytes In | %d Bytes Out | %d Commands Issued\n", 661 priv->bytes_in, priv->bytes_out, priv->cmd_count); 662 } /* cypress_close */ 663 664 665 static int cypress_write(struct tty_struct *tty, struct usb_serial_port *port, 666 const unsigned char *buf, int count) 667 { 668 struct cypress_private *priv = usb_get_serial_port_data(port); 669 670 dev_dbg(&port->dev, "%s - port %d, %d bytes\n", __func__, port->number, count); 671 672 /* line control commands, which need to be executed immediately, 673 are not put into the buffer for obvious reasons. 674 */ 675 if (priv->cmd_ctrl) { 676 count = 0; 677 goto finish; 678 } 679 680 if (!count) 681 return count; 682 683 count = kfifo_in_locked(&priv->write_fifo, buf, count, &priv->lock); 684 685 finish: 686 cypress_send(port); 687 688 return count; 689 } /* cypress_write */ 690 691 692 static void cypress_send(struct usb_serial_port *port) 693 { 694 int count = 0, result, offset, actual_size; 695 struct cypress_private *priv = usb_get_serial_port_data(port); 696 struct device *dev = &port->dev; 697 unsigned long flags; 698 699 if (!priv->comm_is_ok) 700 return; 701 702 dev_dbg(dev, "%s - interrupt out size is %d\n", __func__, 703 port->interrupt_out_size); 704 705 spin_lock_irqsave(&priv->lock, flags); 706 if (priv->write_urb_in_use) { 707 dev_dbg(dev, "%s - can't write, urb in use\n", __func__); 708 spin_unlock_irqrestore(&priv->lock, flags); 709 return; 710 } 711 spin_unlock_irqrestore(&priv->lock, flags); 712 713 /* clear buffer */ 714 memset(port->interrupt_out_urb->transfer_buffer, 0, 715 port->interrupt_out_size); 716 717 spin_lock_irqsave(&priv->lock, flags); 718 switch (priv->pkt_fmt) { 719 default: 720 case packet_format_1: 721 /* this is for the CY7C64013... */ 722 offset = 2; 723 port->interrupt_out_buffer[0] = priv->line_control; 724 break; 725 case packet_format_2: 726 /* this is for the CY7C63743... */ 727 offset = 1; 728 port->interrupt_out_buffer[0] = priv->line_control; 729 break; 730 } 731 732 if (priv->line_control & CONTROL_RESET) 733 priv->line_control &= ~CONTROL_RESET; 734 735 if (priv->cmd_ctrl) { 736 priv->cmd_count++; 737 dev_dbg(dev, "%s - line control command being issued\n", __func__); 738 spin_unlock_irqrestore(&priv->lock, flags); 739 goto send; 740 } else 741 spin_unlock_irqrestore(&priv->lock, flags); 742 743 count = kfifo_out_locked(&priv->write_fifo, 744 &port->interrupt_out_buffer[offset], 745 port->interrupt_out_size - offset, 746 &priv->lock); 747 if (count == 0) 748 return; 749 750 switch (priv->pkt_fmt) { 751 default: 752 case packet_format_1: 753 port->interrupt_out_buffer[1] = count; 754 break; 755 case packet_format_2: 756 port->interrupt_out_buffer[0] |= count; 757 } 758 759 dev_dbg(dev, "%s - count is %d\n", __func__, count); 760 761 send: 762 spin_lock_irqsave(&priv->lock, flags); 763 priv->write_urb_in_use = 1; 764 spin_unlock_irqrestore(&priv->lock, flags); 765 766 if (priv->cmd_ctrl) 767 actual_size = 1; 768 else 769 actual_size = count + 770 (priv->pkt_fmt == packet_format_1 ? 2 : 1); 771 772 usb_serial_debug_data(dev, __func__, port->interrupt_out_size, 773 port->interrupt_out_urb->transfer_buffer); 774 775 usb_fill_int_urb(port->interrupt_out_urb, port->serial->dev, 776 usb_sndintpipe(port->serial->dev, port->interrupt_out_endpointAddress), 777 port->interrupt_out_buffer, port->interrupt_out_size, 778 cypress_write_int_callback, port, priv->write_urb_interval); 779 result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC); 780 if (result) { 781 dev_err_console(port, 782 "%s - failed submitting write urb, error %d\n", 783 __func__, result); 784 priv->write_urb_in_use = 0; 785 cypress_set_dead(port); 786 } 787 788 spin_lock_irqsave(&priv->lock, flags); 789 if (priv->cmd_ctrl) 790 priv->cmd_ctrl = 0; 791 792 /* do not count the line control and size bytes */ 793 priv->bytes_out += count; 794 spin_unlock_irqrestore(&priv->lock, flags); 795 796 usb_serial_port_softint(port); 797 } /* cypress_send */ 798 799 800 /* returns how much space is available in the soft buffer */ 801 static int cypress_write_room(struct tty_struct *tty) 802 { 803 struct usb_serial_port *port = tty->driver_data; 804 struct cypress_private *priv = usb_get_serial_port_data(port); 805 int room = 0; 806 unsigned long flags; 807 808 spin_lock_irqsave(&priv->lock, flags); 809 room = kfifo_avail(&priv->write_fifo); 810 spin_unlock_irqrestore(&priv->lock, flags); 811 812 dev_dbg(&port->dev, "%s - returns %d\n", __func__, room); 813 return room; 814 } 815 816 817 static int cypress_tiocmget(struct tty_struct *tty) 818 { 819 struct usb_serial_port *port = tty->driver_data; 820 struct cypress_private *priv = usb_get_serial_port_data(port); 821 __u8 status, control; 822 unsigned int result = 0; 823 unsigned long flags; 824 825 spin_lock_irqsave(&priv->lock, flags); 826 control = priv->line_control; 827 status = priv->current_status; 828 spin_unlock_irqrestore(&priv->lock, flags); 829 830 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0) 831 | ((control & CONTROL_RTS) ? TIOCM_RTS : 0) 832 | ((status & UART_CTS) ? TIOCM_CTS : 0) 833 | ((status & UART_DSR) ? TIOCM_DSR : 0) 834 | ((status & UART_RI) ? TIOCM_RI : 0) 835 | ((status & UART_CD) ? TIOCM_CD : 0); 836 837 dev_dbg(&port->dev, "%s - result = %x\n", __func__, result); 838 839 return result; 840 } 841 842 843 static int cypress_tiocmset(struct tty_struct *tty, 844 unsigned int set, unsigned int clear) 845 { 846 struct usb_serial_port *port = tty->driver_data; 847 struct cypress_private *priv = usb_get_serial_port_data(port); 848 unsigned long flags; 849 850 spin_lock_irqsave(&priv->lock, flags); 851 if (set & TIOCM_RTS) 852 priv->line_control |= CONTROL_RTS; 853 if (set & TIOCM_DTR) 854 priv->line_control |= CONTROL_DTR; 855 if (clear & TIOCM_RTS) 856 priv->line_control &= ~CONTROL_RTS; 857 if (clear & TIOCM_DTR) 858 priv->line_control &= ~CONTROL_DTR; 859 priv->cmd_ctrl = 1; 860 spin_unlock_irqrestore(&priv->lock, flags); 861 862 return cypress_write(tty, port, NULL, 0); 863 } 864 865 866 static int cypress_tiocmiwait(struct tty_struct *tty, unsigned long arg) 867 { 868 struct usb_serial_port *port = tty->driver_data; 869 struct cypress_private *priv = usb_get_serial_port_data(port); 870 char diff; 871 872 for (;;) { 873 interruptible_sleep_on(&port->port.delta_msr_wait); 874 /* see if a signal did it */ 875 if (signal_pending(current)) 876 return -ERESTARTSYS; 877 878 if (port->serial->disconnected) 879 return -EIO; 880 881 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 } 903 904 static void cypress_set_termios(struct tty_struct *tty, 905 struct usb_serial_port *port, struct ktermios *old_termios) 906 { 907 struct cypress_private *priv = usb_get_serial_port_data(port); 908 struct device *dev = &port->dev; 909 int data_bits, stop_bits, parity_type, parity_enable; 910 unsigned cflag, iflag; 911 unsigned long flags; 912 __u8 oldlines; 913 int linechange = 0; 914 915 spin_lock_irqsave(&priv->lock, flags); 916 /* We can't clean this one up as we don't know the device type 917 early enough */ 918 if (!priv->termios_initialized) { 919 if (priv->chiptype == CT_EARTHMATE) { 920 tty->termios = tty_std_termios; 921 tty->termios.c_cflag = B4800 | CS8 | CREAD | HUPCL | 922 CLOCAL; 923 tty->termios.c_ispeed = 4800; 924 tty->termios.c_ospeed = 4800; 925 } else if (priv->chiptype == CT_CYPHIDCOM) { 926 tty->termios = tty_std_termios; 927 tty->termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | 928 CLOCAL; 929 tty->termios.c_ispeed = 9600; 930 tty->termios.c_ospeed = 9600; 931 } else if (priv->chiptype == CT_CA42V2) { 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 } 938 priv->termios_initialized = 1; 939 } 940 spin_unlock_irqrestore(&priv->lock, flags); 941 942 /* Unsupported features need clearing */ 943 tty->termios.c_cflag &= ~(CMSPAR|CRTSCTS); 944 945 cflag = tty->termios.c_cflag; 946 iflag = tty->termios.c_iflag; 947 948 /* check if there are new settings */ 949 if (old_termios) { 950 spin_lock_irqsave(&priv->lock, flags); 951 priv->tmp_termios = tty->termios; 952 spin_unlock_irqrestore(&priv->lock, flags); 953 } 954 955 /* set number of data bits, parity, stop bits */ 956 /* when parity is disabled the parity type bit is ignored */ 957 958 /* 1 means 2 stop bits, 0 means 1 stop bit */ 959 stop_bits = cflag & CSTOPB ? 1 : 0; 960 961 if (cflag & PARENB) { 962 parity_enable = 1; 963 /* 1 means odd parity, 0 means even parity */ 964 parity_type = cflag & PARODD ? 1 : 0; 965 } else 966 parity_enable = parity_type = 0; 967 968 switch (cflag & CSIZE) { 969 case CS5: 970 data_bits = 0; 971 break; 972 case CS6: 973 data_bits = 1; 974 break; 975 case CS7: 976 data_bits = 2; 977 break; 978 case CS8: 979 data_bits = 3; 980 break; 981 default: 982 dev_err(dev, "%s - CSIZE was set, but not CS5-CS8\n", __func__); 983 data_bits = 3; 984 } 985 spin_lock_irqsave(&priv->lock, flags); 986 oldlines = priv->line_control; 987 if ((cflag & CBAUD) == B0) { 988 /* drop dtr and rts */ 989 dev_dbg(dev, "%s - dropping the lines, baud rate 0bps\n", __func__); 990 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS); 991 } else 992 priv->line_control = (CONTROL_DTR | CONTROL_RTS); 993 spin_unlock_irqrestore(&priv->lock, flags); 994 995 dev_dbg(dev, "%s - sending %d stop_bits, %d parity_enable, %d parity_type, %d data_bits (+5)\n", 996 __func__, stop_bits, parity_enable, parity_type, data_bits); 997 998 cypress_serial_control(tty, port, tty_get_baud_rate(tty), 999 data_bits, stop_bits, 1000 parity_enable, parity_type, 1001 0, CYPRESS_SET_CONFIG); 1002 1003 /* we perform a CYPRESS_GET_CONFIG so that the current settings are 1004 * filled into the private structure this should confirm that all is 1005 * working if it returns what we just set */ 1006 cypress_serial_control(tty, port, 0, 0, 0, 0, 0, 0, CYPRESS_GET_CONFIG); 1007 1008 /* Here we can define custom tty settings for devices; the main tty 1009 * termios flag base comes from empeg.c */ 1010 1011 spin_lock_irqsave(&priv->lock, flags); 1012 if (priv->chiptype == CT_EARTHMATE && priv->baud_rate == 4800) { 1013 dev_dbg(dev, "Using custom termios settings for a baud rate of 4800bps.\n"); 1014 /* define custom termios settings for NMEA protocol */ 1015 1016 tty->termios.c_iflag /* input modes - */ 1017 &= ~(IGNBRK /* disable ignore break */ 1018 | BRKINT /* disable break causes interrupt */ 1019 | PARMRK /* disable mark parity errors */ 1020 | ISTRIP /* disable clear high bit of input char */ 1021 | INLCR /* disable translate NL to CR */ 1022 | IGNCR /* disable ignore CR */ 1023 | ICRNL /* disable translate CR to NL */ 1024 | IXON); /* disable enable XON/XOFF flow control */ 1025 1026 tty->termios.c_oflag /* output modes */ 1027 &= ~OPOST; /* disable postprocess output char */ 1028 1029 tty->termios.c_lflag /* line discipline modes */ 1030 &= ~(ECHO /* disable echo input characters */ 1031 | ECHONL /* disable echo new line */ 1032 | ICANON /* disable erase, kill, werase, and rprnt 1033 special characters */ 1034 | ISIG /* disable interrupt, quit, and suspend 1035 special characters */ 1036 | IEXTEN); /* disable non-POSIX special characters */ 1037 } /* CT_CYPHIDCOM: Application should handle this for device */ 1038 1039 linechange = (priv->line_control != oldlines); 1040 spin_unlock_irqrestore(&priv->lock, flags); 1041 1042 /* if necessary, set lines */ 1043 if (linechange) { 1044 priv->cmd_ctrl = 1; 1045 cypress_write(tty, port, NULL, 0); 1046 } 1047 } /* cypress_set_termios */ 1048 1049 1050 /* returns amount of data still left in soft buffer */ 1051 static int cypress_chars_in_buffer(struct tty_struct *tty) 1052 { 1053 struct usb_serial_port *port = tty->driver_data; 1054 struct cypress_private *priv = usb_get_serial_port_data(port); 1055 int chars = 0; 1056 unsigned long flags; 1057 1058 spin_lock_irqsave(&priv->lock, flags); 1059 chars = kfifo_len(&priv->write_fifo); 1060 spin_unlock_irqrestore(&priv->lock, flags); 1061 1062 dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars); 1063 return chars; 1064 } 1065 1066 1067 static void cypress_throttle(struct tty_struct *tty) 1068 { 1069 struct usb_serial_port *port = tty->driver_data; 1070 struct cypress_private *priv = usb_get_serial_port_data(port); 1071 1072 spin_lock_irq(&priv->lock); 1073 priv->rx_flags = THROTTLED; 1074 spin_unlock_irq(&priv->lock); 1075 } 1076 1077 1078 static void cypress_unthrottle(struct tty_struct *tty) 1079 { 1080 struct usb_serial_port *port = tty->driver_data; 1081 struct cypress_private *priv = usb_get_serial_port_data(port); 1082 int actually_throttled, result; 1083 1084 spin_lock_irq(&priv->lock); 1085 actually_throttled = priv->rx_flags & ACTUALLY_THROTTLED; 1086 priv->rx_flags = 0; 1087 spin_unlock_irq(&priv->lock); 1088 1089 if (!priv->comm_is_ok) 1090 return; 1091 1092 if (actually_throttled) { 1093 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL); 1094 if (result) { 1095 dev_err(&port->dev, "%s - failed submitting read urb, " 1096 "error %d\n", __func__, result); 1097 cypress_set_dead(port); 1098 } 1099 } 1100 } 1101 1102 1103 static void cypress_read_int_callback(struct urb *urb) 1104 { 1105 struct usb_serial_port *port = urb->context; 1106 struct cypress_private *priv = usb_get_serial_port_data(port); 1107 struct device *dev = &urb->dev->dev; 1108 struct tty_struct *tty; 1109 unsigned char *data = urb->transfer_buffer; 1110 unsigned long flags; 1111 char tty_flag = TTY_NORMAL; 1112 int havedata = 0; 1113 int bytes = 0; 1114 int result; 1115 int i = 0; 1116 int status = urb->status; 1117 1118 switch (status) { 1119 case 0: /* success */ 1120 break; 1121 case -ECONNRESET: 1122 case -ENOENT: 1123 case -ESHUTDOWN: 1124 /* precursor to disconnect so just go away */ 1125 return; 1126 case -EPIPE: 1127 /* Can't call usb_clear_halt while in_interrupt */ 1128 /* FALLS THROUGH */ 1129 default: 1130 /* something ugly is going on... */ 1131 dev_err(dev, "%s - unexpected nonzero read status received: %d\n", 1132 __func__, status); 1133 cypress_set_dead(port); 1134 return; 1135 } 1136 1137 spin_lock_irqsave(&priv->lock, flags); 1138 if (priv->rx_flags & THROTTLED) { 1139 dev_dbg(dev, "%s - now throttling\n", __func__); 1140 priv->rx_flags |= ACTUALLY_THROTTLED; 1141 spin_unlock_irqrestore(&priv->lock, flags); 1142 return; 1143 } 1144 spin_unlock_irqrestore(&priv->lock, flags); 1145 1146 tty = tty_port_tty_get(&port->port); 1147 if (!tty) { 1148 dev_dbg(dev, "%s - bad tty pointer - exiting\n", __func__); 1149 return; 1150 } 1151 1152 spin_lock_irqsave(&priv->lock, flags); 1153 result = urb->actual_length; 1154 switch (priv->pkt_fmt) { 1155 default: 1156 case packet_format_1: 1157 /* This is for the CY7C64013... */ 1158 priv->current_status = data[0] & 0xF8; 1159 bytes = data[1] + 2; 1160 i = 2; 1161 if (bytes > 2) 1162 havedata = 1; 1163 break; 1164 case packet_format_2: 1165 /* This is for the CY7C63743... */ 1166 priv->current_status = data[0] & 0xF8; 1167 bytes = (data[0] & 0x07) + 1; 1168 i = 1; 1169 if (bytes > 1) 1170 havedata = 1; 1171 break; 1172 } 1173 spin_unlock_irqrestore(&priv->lock, flags); 1174 if (result < bytes) { 1175 dev_dbg(dev, 1176 "%s - wrong packet size - received %d bytes but packet said %d bytes\n", 1177 __func__, result, bytes); 1178 goto continue_read; 1179 } 1180 1181 usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data); 1182 1183 spin_lock_irqsave(&priv->lock, flags); 1184 /* check to see if status has changed */ 1185 if (priv->current_status != priv->prev_status) { 1186 priv->diff_status |= priv->current_status ^ 1187 priv->prev_status; 1188 wake_up_interruptible(&port->port.delta_msr_wait); 1189 priv->prev_status = priv->current_status; 1190 } 1191 spin_unlock_irqrestore(&priv->lock, flags); 1192 1193 /* hangup, as defined in acm.c... this might be a bad place for it 1194 * though */ 1195 if (tty && !(tty->termios.c_cflag & CLOCAL) && 1196 !(priv->current_status & UART_CD)) { 1197 dev_dbg(dev, "%s - calling hangup\n", __func__); 1198 tty_hangup(tty); 1199 goto continue_read; 1200 } 1201 1202 /* There is one error bit... I'm assuming it is a parity error 1203 * indicator as the generic firmware will set this bit to 1 if a 1204 * parity error occurs. 1205 * I can not find reference to any other error events. */ 1206 spin_lock_irqsave(&priv->lock, flags); 1207 if (priv->current_status & CYP_ERROR) { 1208 spin_unlock_irqrestore(&priv->lock, flags); 1209 tty_flag = TTY_PARITY; 1210 dev_dbg(dev, "%s - Parity Error detected\n", __func__); 1211 } else 1212 spin_unlock_irqrestore(&priv->lock, flags); 1213 1214 /* process read if there is data other than line status */ 1215 if (bytes > i) { 1216 tty_insert_flip_string_fixed_flag(&port->port, data + i, 1217 tty_flag, bytes - i); 1218 tty_flip_buffer_push(&port->port); 1219 } 1220 1221 spin_lock_irqsave(&priv->lock, flags); 1222 /* control and status byte(s) are also counted */ 1223 priv->bytes_in += bytes; 1224 spin_unlock_irqrestore(&priv->lock, flags); 1225 1226 continue_read: 1227 tty_kref_put(tty); 1228 1229 /* Continue trying to always read */ 1230 1231 if (priv->comm_is_ok) { 1232 usb_fill_int_urb(port->interrupt_in_urb, port->serial->dev, 1233 usb_rcvintpipe(port->serial->dev, 1234 port->interrupt_in_endpointAddress), 1235 port->interrupt_in_urb->transfer_buffer, 1236 port->interrupt_in_urb->transfer_buffer_length, 1237 cypress_read_int_callback, port, 1238 priv->read_urb_interval); 1239 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC); 1240 if (result && result != -EPERM) { 1241 dev_err(dev, "%s - failed resubmitting read urb, error %d\n", 1242 __func__, result); 1243 cypress_set_dead(port); 1244 } 1245 } 1246 } /* cypress_read_int_callback */ 1247 1248 1249 static void cypress_write_int_callback(struct urb *urb) 1250 { 1251 struct usb_serial_port *port = urb->context; 1252 struct cypress_private *priv = usb_get_serial_port_data(port); 1253 struct device *dev = &urb->dev->dev; 1254 int result; 1255 int status = urb->status; 1256 1257 switch (status) { 1258 case 0: 1259 /* success */ 1260 break; 1261 case -ECONNRESET: 1262 case -ENOENT: 1263 case -ESHUTDOWN: 1264 /* this urb is terminated, clean up */ 1265 dev_dbg(dev, "%s - urb shutting down with status: %d\n", 1266 __func__, status); 1267 priv->write_urb_in_use = 0; 1268 return; 1269 case -EPIPE: /* no break needed; clear halt and resubmit */ 1270 if (!priv->comm_is_ok) 1271 break; 1272 usb_clear_halt(port->serial->dev, 0x02); 1273 /* error in the urb, so we have to resubmit it */ 1274 dev_dbg(dev, "%s - nonzero write bulk status received: %d\n", 1275 __func__, status); 1276 port->interrupt_out_urb->transfer_buffer_length = 1; 1277 result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC); 1278 if (!result) 1279 return; 1280 dev_err(dev, "%s - failed resubmitting write urb, error %d\n", 1281 __func__, result); 1282 cypress_set_dead(port); 1283 break; 1284 default: 1285 dev_err(dev, "%s - unexpected nonzero write status received: %d\n", 1286 __func__, status); 1287 cypress_set_dead(port); 1288 break; 1289 } 1290 priv->write_urb_in_use = 0; 1291 1292 /* send any buffered data */ 1293 cypress_send(port); 1294 } 1295 1296 module_usb_serial_driver(serial_drivers, id_table_combined); 1297 1298 MODULE_AUTHOR(DRIVER_AUTHOR); 1299 MODULE_DESCRIPTION(DRIVER_DESC); 1300 MODULE_LICENSE("GPL"); 1301 1302 module_param(stats, bool, S_IRUGO | S_IWUSR); 1303 MODULE_PARM_DESC(stats, "Enable statistics or not"); 1304 module_param(interval, int, S_IRUGO | S_IWUSR); 1305 MODULE_PARM_DESC(interval, "Overrides interrupt interval"); 1306 module_param(unstable_bauds, bool, S_IRUGO | S_IWUSR); 1307 MODULE_PARM_DESC(unstable_bauds, "Allow unstable baud rates"); 1308