drivers/usb/serial/cypress_m8.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * USB Cypress M8 driver
   4  *
   5  *      Copyright (C) 2004
   6  *          Lonnie Mendez (dignome@gmail.com)
   7  *      Copyright (C) 2003,2004
   8  *          Neil Whelchel (koyama@firstlight.net)
   9  *
  10  * See Documentation/usb/usb-serial.rst for more information on using this
  11  * driver
  12  *
  13  * See http://geocities.com/i0xox0i for information on this driver and the
  14  * earthmate usb device.
  15  */
  16
  17 /* Thanks to Neil Whelchel for writing the first cypress m8 implementation
  18    for linux. */
  19 /* Thanks to cypress for providing references for the hid reports. */
  20 /* Thanks to Jiang Zhang for providing links and for general help. */
  21 /* Code originates and was built up from ftdi_sio, belkin, pl2303 and others.*/
  22
  23
  24 #include <linux/kernel.h>
  25 #include <linux/errno.h>
  26 #include <linux/slab.h>
  27 #include <linux/tty.h>
  28 #include <linux/tty_driver.h>
  29 #include <linux/tty_flip.h>
  30 #include <linux/module.h>
  31 #include <linux/moduleparam.h>
  32 #include <linux/spinlock.h>
  33 #include <linux/usb.h>
  34 #include <linux/usb/serial.h>
  35 #include <linux/serial.h>
  36 #include <linux/kfifo.h>
  37 #include <linux/delay.h>
  38 #include <linux/uaccess.h>
  39 #include <asm/unaligned.h>
  40
  41 #include "cypress_m8.h"
  42
  43
  44 static bool stats;
  45 static int interval;
  46 static bool unstable_bauds;
  47
  48 #define DRIVER_AUTHOR "Lonnie Mendez <dignome@gmail.com>, Neil Whelchel <koyama@firstlight.net>"
  49 #define DRIVER_DESC "Cypress USB to Serial Driver"
  50
  51 /* write buffer size defines */
  52 #define CYPRESS_BUF_SIZE        1024
  53
  54 static const struct usb_device_id id_table_earthmate[] = {
  55         { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
  56         { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
  57         { }                                             /* Terminating entry */
  58 };
  59
  60 static const struct usb_device_id id_table_cyphidcomrs232[] = {
  61         { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
  62         { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) },
  63         { USB_DEVICE(VENDOR_ID_FRWD, PRODUCT_ID_CYPHIDCOM_FRWD) },
  64         { }                                             /* Terminating entry */
  65 };
  66
  67 static const struct usb_device_id id_table_nokiaca42v2[] = {
  68         { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
  69         { }                                             /* Terminating entry */
  70 };
  71
  72 static const struct usb_device_id id_table_combined[] = {
  73         { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
  74         { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
  75         { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
  76         { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) },
  77         { USB_DEVICE(VENDOR_ID_FRWD, PRODUCT_ID_CYPHIDCOM_FRWD) },
  78         { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
  79         { }                                             /* Terminating entry */
  80 };
  81
  82 MODULE_DEVICE_TABLE(usb, id_table_combined);
  83
  84 enum packet_format {
  85         packet_format_1,  /* b0:status, b1:payload count */
  86         packet_format_2   /* b0[7:3]:status, b0[2:0]:payload count */
  87 };
  88
  89 struct cypress_private {
  90         spinlock_t lock;                   /* private lock */
  91         int chiptype;                      /* identifier of device, for quirks/etc */
  92         int bytes_in;                      /* used for statistics */
  93         int bytes_out;                     /* used for statistics */
  94         int cmd_count;                     /* used for statistics */
  95         int cmd_ctrl;                      /* always set this to 1 before issuing a command */
  96         struct kfifo write_fifo;           /* write fifo */
  97         int write_urb_in_use;              /* write urb in use indicator */
  98         int write_urb_interval;            /* interval to use for write urb */
  99         int read_urb_interval;             /* interval to use for read urb */
 100         int comm_is_ok;                    /* true if communication is (still) ok */
 101         __u8 line_control;                 /* holds dtr / rts value */
 102         __u8 current_status;               /* received from last read - info on dsr,cts,cd,ri,etc */
 103         __u8 current_config;               /* stores the current configuration byte */
 104         __u8 rx_flags;                     /* throttling - used from whiteheat/ftdi_sio */
 105         enum packet_format pkt_fmt;        /* format to use for packet send / receive */
 106         int get_cfg_unsafe;                /* If true, the CYPRESS_GET_CONFIG is unsafe */
 107         int baud_rate;                     /* stores current baud rate in
 108                                               integer form */
 109         char prev_status;                  /* used for TIOCMIWAIT */
 110 };
 111
 112 /* function prototypes for the Cypress USB to serial device */
 113 static int  cypress_earthmate_port_probe(struct usb_serial_port *port);
 114 static int  cypress_hidcom_port_probe(struct usb_serial_port *port);
 115 static int  cypress_ca42v2_port_probe(struct usb_serial_port *port);
 116 static int  cypress_port_remove(struct usb_serial_port *port);
 117 static int  cypress_open(struct tty_struct *tty, struct usb_serial_port *port);
 118 static void cypress_close(struct usb_serial_port *port);
 119 static void cypress_dtr_rts(struct usb_serial_port *port, int on);
 120 static int  cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
 121                         const unsigned char *buf, int count);
 122 static void cypress_send(struct usb_serial_port *port);
 123 static int  cypress_write_room(struct tty_struct *tty);
 124 static void cypress_earthmate_init_termios(struct tty_struct *tty);
 125 static void cypress_set_termios(struct tty_struct *tty,
 126                         struct usb_serial_port *port, struct ktermios *old);
 127 static int  cypress_tiocmget(struct tty_struct *tty);
 128 static int  cypress_tiocmset(struct tty_struct *tty,
 129                         unsigned int set, unsigned int clear);
 130 static int  cypress_chars_in_buffer(struct tty_struct *tty);
 131 static void cypress_throttle(struct tty_struct *tty);
 132 static void cypress_unthrottle(struct tty_struct *tty);
 133 static void cypress_set_dead(struct usb_serial_port *port);
 134 static void cypress_read_int_callback(struct urb *urb);
 135 static void cypress_write_int_callback(struct urb *urb);
 136
 137 static struct usb_serial_driver cypress_earthmate_device = {
 138         .driver = {
 139                 .owner =                THIS_MODULE,
 140                 .name =                 "earthmate",
 141         },
 142         .description =                  "DeLorme Earthmate USB",
 143         .id_table =                     id_table_earthmate,
 144         .num_ports =                    1,
 145         .port_probe =                   cypress_earthmate_port_probe,
 146         .port_remove =                  cypress_port_remove,
 147         .open =                         cypress_open,
 148         .close =                        cypress_close,
 149         .dtr_rts =                      cypress_dtr_rts,
 150         .write =                        cypress_write,
 151         .write_room =                   cypress_write_room,
 152         .init_termios =                 cypress_earthmate_init_termios,
 153         .set_termios =                  cypress_set_termios,
 154         .tiocmget =                     cypress_tiocmget,
 155         .tiocmset =                     cypress_tiocmset,
 156         .tiocmiwait =                   usb_serial_generic_tiocmiwait,
 157         .chars_in_buffer =              cypress_chars_in_buffer,
 158         .throttle =                     cypress_throttle,
 159         .unthrottle =                   cypress_unthrottle,
 160         .read_int_callback =            cypress_read_int_callback,
 161         .write_int_callback =           cypress_write_int_callback,
 162 };
 163
 164 static struct usb_serial_driver cypress_hidcom_device = {
 165         .driver = {
 166                 .owner =                THIS_MODULE,
 167                 .name =                 "cyphidcom",
 168         },
 169         .description =                  "HID->COM RS232 Adapter",
 170         .id_table =                     id_table_cyphidcomrs232,
 171         .num_ports =                    1,
 172         .port_probe =                   cypress_hidcom_port_probe,
 173         .port_remove =                  cypress_port_remove,
 174         .open =                         cypress_open,
 175         .close =                        cypress_close,
 176         .dtr_rts =                      cypress_dtr_rts,
 177         .write =                        cypress_write,
 178         .write_room =                   cypress_write_room,
 179         .set_termios =                  cypress_set_termios,
 180         .tiocmget =                     cypress_tiocmget,
 181         .tiocmset =                     cypress_tiocmset,
 182         .tiocmiwait =                   usb_serial_generic_tiocmiwait,
 183         .chars_in_buffer =              cypress_chars_in_buffer,
 184         .throttle =                     cypress_throttle,
 185         .unthrottle =                   cypress_unthrottle,
 186         .read_int_callback =            cypress_read_int_callback,
 187         .write_int_callback =           cypress_write_int_callback,
 188 };
 189
 190 static struct usb_serial_driver cypress_ca42v2_device = {
 191         .driver = {
 192                 .owner =                THIS_MODULE,
 193                 .name =                 "nokiaca42v2",
 194         },
 195         .description =                  "Nokia CA-42 V2 Adapter",
 196         .id_table =                     id_table_nokiaca42v2,
 197         .num_ports =                    1,
 198         .port_probe =                   cypress_ca42v2_port_probe,
 199         .port_remove =                  cypress_port_remove,
 200         .open =                         cypress_open,
 201         .close =                        cypress_close,
 202         .dtr_rts =                      cypress_dtr_rts,
 203         .write =                        cypress_write,
 204         .write_room =                   cypress_write_room,
 205         .set_termios =                  cypress_set_termios,
 206         .tiocmget =                     cypress_tiocmget,
 207         .tiocmset =                     cypress_tiocmset,
 208         .tiocmiwait =                   usb_serial_generic_tiocmiwait,
 209         .chars_in_buffer =              cypress_chars_in_buffer,
 210         .throttle =                     cypress_throttle,
 211         .unthrottle =                   cypress_unthrottle,
 212         .read_int_callback =            cypress_read_int_callback,
 213         .write_int_callback =           cypress_write_int_callback,
 214 };
 215
 216 static struct usb_serial_driver * const serial_drivers[] = {
 217         &cypress_earthmate_device, &cypress_hidcom_device,
 218         &cypress_ca42v2_device, NULL
 219 };
 220
 221 /*****************************************************************************
 222  * Cypress serial helper functions
 223  *****************************************************************************/
 224
 225 /* FRWD Dongle hidcom needs to skip reset and speed checks */
 226 static inline bool is_frwd(struct usb_device *dev)
 227 {
 228         return ((le16_to_cpu(dev->descriptor.idVendor) == VENDOR_ID_FRWD) &&
 229                 (le16_to_cpu(dev->descriptor.idProduct) == PRODUCT_ID_CYPHIDCOM_FRWD));
 230 }
 231
 232 static int analyze_baud_rate(struct usb_serial_port *port, speed_t new_rate)
 233 {
 234         struct cypress_private *priv;
 235         priv = usb_get_serial_port_data(port);
 236
 237         if (unstable_bauds)
 238                 return new_rate;
 239
 240         /* FRWD Dongle uses 115200 bps */
 241         if (is_frwd(port->serial->dev))
 242                 return new_rate;
 243
 244         /*
 245          * The general purpose firmware for the Cypress M8 allows for
 246          * a maximum speed of 57600bps (I have no idea whether DeLorme
 247          * chose to use the general purpose firmware or not), if you
 248          * need to modify this speed setting for your own project
 249          * please add your own chiptype and modify the code likewise.
 250          * The Cypress HID->COM device will work successfully up to
 251          * 115200bps (but the actual throughput is around 3kBps).
 252          */
 253         if (port->serial->dev->speed == USB_SPEED_LOW) {
 254                 /*
 255                  * Mike Isely <isely@pobox.com> 2-Feb-2008: The
 256                  * Cypress app note that describes this mechanism
 257                  * states the the low-speed part can't handle more
 258                  * than 800 bytes/sec, in which case 4800 baud is the
 259                  * safest speed for a part like that.
 260                  */
 261                 if (new_rate > 4800) {
 262                         dev_dbg(&port->dev,
 263                                 "%s - failed setting baud rate, device incapable speed %d\n",
 264                                 __func__, new_rate);
 265                         return -1;
 266                 }
 267         }
 268         switch (priv->chiptype) {
 269         case CT_EARTHMATE:
 270                 if (new_rate <= 600) {
 271                         /* 300 and 600 baud rates are supported under
 272                          * the generic firmware, but are not used with
 273                          * NMEA and SiRF protocols */
 274                         dev_dbg(&port->dev,
 275                                 "%s - failed setting baud rate, unsupported speed of %d on Earthmate GPS\n",
 276                                 __func__, new_rate);
 277                         return -1;
 278                 }
 279                 break;
 280         default:
 281                 break;
 282         }
 283         return new_rate;
 284 }
 285
 286
 287 /* This function can either set or retrieve the current serial line settings */
 288 static int cypress_serial_control(struct tty_struct *tty,
 289         struct usb_serial_port *port, speed_t baud_rate, int data_bits,
 290         int stop_bits, int parity_enable, int parity_type, int reset,
 291         int cypress_request_type)
 292 {
 293         int new_baudrate = 0, retval = 0, tries = 0;
 294         struct cypress_private *priv;
 295         struct device *dev = &port->dev;
 296         u8 *feature_buffer;
 297         const unsigned int feature_len = 5;
 298         unsigned long flags;
 299
 300         priv = usb_get_serial_port_data(port);
 301
 302         if (!priv->comm_is_ok)
 303                 return -ENODEV;
 304
 305         feature_buffer = kcalloc(feature_len, sizeof(u8), GFP_KERNEL);
 306         if (!feature_buffer)
 307                 return -ENOMEM;
 308
 309         switch (cypress_request_type) {
 310         case CYPRESS_SET_CONFIG:
 311                 /* 0 means 'Hang up' so doesn't change the true bit rate */
 312                 new_baudrate = priv->baud_rate;
 313                 if (baud_rate && baud_rate != priv->baud_rate) {
 314                         dev_dbg(dev, "%s - baud rate is changing\n", __func__);
 315                         retval = analyze_baud_rate(port, baud_rate);
 316                         if (retval >= 0) {
 317                                 new_baudrate = retval;
 318                                 dev_dbg(dev, "%s - New baud rate set to %d\n",
 319                                         __func__, new_baudrate);
 320                         }
 321                 }
 322                 dev_dbg(dev, "%s - baud rate is being sent as %d\n", __func__,
 323                         new_baudrate);
 324
 325                 /* fill the feature_buffer with new configuration */
 326                 put_unaligned_le32(new_baudrate, feature_buffer);
 327                 feature_buffer[4] |= data_bits;   /* assign data bits in 2 bit space ( max 3 ) */
 328                 /* 1 bit gap */
 329                 feature_buffer[4] |= (stop_bits << 3);   /* assign stop bits in 1 bit space */
 330                 feature_buffer[4] |= (parity_enable << 4);   /* assign parity flag in 1 bit space */
 331                 feature_buffer[4] |= (parity_type << 5);   /* assign parity type in 1 bit space */
 332                 /* 1 bit gap */
 333                 feature_buffer[4] |= (reset << 7);   /* assign reset at end of byte, 1 bit space */
 334
 335                 dev_dbg(dev, "%s - device is being sent this feature report:\n", __func__);
 336                 dev_dbg(dev, "%s - %02X - %02X - %02X - %02X - %02X\n", __func__,
 337                         feature_buffer[0], feature_buffer[1],
 338                         feature_buffer[2], feature_buffer[3],
 339                         feature_buffer[4]);
 340
 341                 do {
 342                         retval = usb_control_msg(port->serial->dev,
 343                                         usb_sndctrlpipe(port->serial->dev, 0),
 344                                         HID_REQ_SET_REPORT,
 345                                         USB_DIR_OUT | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
 346                                         0x0300, 0, feature_buffer,
 347                                         feature_len, 500);
 348
 349                         if (tries++ >= 3)
 350                                 break;
 351
 352                 } while (retval != feature_len &&
 353                          retval != -ENODEV);
 354
 355                 if (retval != feature_len) {
 356                         dev_err(dev, "%s - failed sending serial line settings - %d\n",
 357                                 __func__, retval);
 358                         cypress_set_dead(port);
 359                 } else {
 360                         spin_lock_irqsave(&priv->lock, flags);
 361                         priv->baud_rate = new_baudrate;
 362                         priv->current_config = feature_buffer[4];
 363                         spin_unlock_irqrestore(&priv->lock, flags);
 364                         /* If we asked for a speed change encode it */
 365                         if (baud_rate)
 366                                 tty_encode_baud_rate(tty,
 367                                         new_baudrate, new_baudrate);
 368                 }
 369         break;
 370         case CYPRESS_GET_CONFIG:
 371                 if (priv->get_cfg_unsafe) {
 372                         /* Not implemented for this device,
 373                            and if we try to do it we're likely
 374                            to crash the hardware. */
 375                         retval = -ENOTTY;
 376                         goto out;
 377                 }
 378                 dev_dbg(dev, "%s - retrieving serial line settings\n", __func__);
 379                 do {
 380                         retval = usb_control_msg(port->serial->dev,
 381                                         usb_rcvctrlpipe(port->serial->dev, 0),
 382                                         HID_REQ_GET_REPORT,
 383                                         USB_DIR_IN | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
 384                                         0x0300, 0, feature_buffer,
 385                                         feature_len, 500);
 386
 387                         if (tries++ >= 3)
 388                                 break;
 389                 } while (retval != feature_len
 390                                                 && retval != -ENODEV);
 391
 392                 if (retval != feature_len) {
 393                         dev_err(dev, "%s - failed to retrieve serial line settings - %d\n",
 394                                 __func__, retval);
 395                         cypress_set_dead(port);
 396                         goto out;
 397                 } else {
 398                         spin_lock_irqsave(&priv->lock, flags);
 399                         /* store the config in one byte, and later
 400                            use bit masks to check values */
 401                         priv->current_config = feature_buffer[4];
 402                         priv->baud_rate = get_unaligned_le32(feature_buffer);
 403                         spin_unlock_irqrestore(&priv->lock, flags);
 404                 }
 405         }
 406         spin_lock_irqsave(&priv->lock, flags);
 407         ++priv->cmd_count;
 408         spin_unlock_irqrestore(&priv->lock, flags);
 409 out:
 410         kfree(feature_buffer);
 411         return retval;
 412 } /* cypress_serial_control */
 413
 414
 415 static void cypress_set_dead(struct usb_serial_port *port)
 416 {
 417         struct cypress_private *priv = usb_get_serial_port_data(port);
 418         unsigned long flags;
 419
 420         spin_lock_irqsave(&priv->lock, flags);
 421         if (!priv->comm_is_ok) {
 422                 spin_unlock_irqrestore(&priv->lock, flags);
 423                 return;
 424         }
 425         priv->comm_is_ok = 0;
 426         spin_unlock_irqrestore(&priv->lock, flags);
 427
 428         dev_err(&port->dev, "cypress_m8 suspending failing port %d - "
 429                 "interval might be too short\n", port->port_number);
 430 }
 431
 432
 433 /*****************************************************************************
 434  * Cypress serial driver functions
 435  *****************************************************************************/
 436
 437
 438 static int cypress_generic_port_probe(struct usb_serial_port *port)
 439 {
 440         struct usb_serial *serial = port->serial;
 441         struct cypress_private *priv;
 442
 443         if (!port->interrupt_out_urb || !port->interrupt_in_urb) {
 444                 dev_err(&port->dev, "required endpoint is missing\n");
 445                 return -ENODEV;
 446         }
 447
 448         priv = kzalloc(sizeof(struct cypress_private), GFP_KERNEL);
 449         if (!priv)
 450                 return -ENOMEM;
 451
 452         priv->comm_is_ok = !0;
 453         spin_lock_init(&priv->lock);
 454         if (kfifo_alloc(&priv->write_fifo, CYPRESS_BUF_SIZE, GFP_KERNEL)) {
 455                 kfree(priv);
 456                 return -ENOMEM;
 457         }
 458
 459         /* Skip reset for FRWD device. It is a workaound:
 460            device hangs if it receives SET_CONFIGURE in Configured
 461            state. */
 462         if (!is_frwd(serial->dev))
 463                 usb_reset_configuration(serial->dev);
 464
 465         priv->cmd_ctrl = 0;
 466         priv->line_control = 0;
 467         priv->rx_flags = 0;
 468         /* Default packet format setting is determined by packet size.
 469            Anything with a size larger then 9 must have a separate
 470            count field since the 3 bit count field is otherwise too
 471            small.  Otherwise we can use the slightly more compact
 472            format.  This is in accordance with the cypress_m8 serial
 473            converter app note. */
 474         if (port->interrupt_out_size > 9)
 475                 priv->pkt_fmt = packet_format_1;
 476         else
 477                 priv->pkt_fmt = packet_format_2;
 478
 479         if (interval > 0) {
 480                 priv->write_urb_interval = interval;
 481                 priv->read_urb_interval = interval;
 482                 dev_dbg(&port->dev, "%s - read & write intervals forced to %d\n",
 483                         __func__, interval);
 484         } else {
 485                 priv->write_urb_interval = port->interrupt_out_urb->interval;
 486                 priv->read_urb_interval = port->interrupt_in_urb->interval;
 487                 dev_dbg(&port->dev, "%s - intervals: read=%d write=%d\n",
 488                         __func__, priv->read_urb_interval,
 489                         priv->write_urb_interval);
 490         }
 491         usb_set_serial_port_data(port, priv);
 492
 493         port->port.drain_delay = 256;
 494
 495         return 0;
 496 }
 497
 498
 499 static int cypress_earthmate_port_probe(struct usb_serial_port *port)
 500 {
 501         struct usb_serial *serial = port->serial;
 502         struct cypress_private *priv;
 503         int ret;
 504
 505         ret = cypress_generic_port_probe(port);
 506         if (ret) {
 507                 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
 508                 return ret;
 509         }
 510
 511         priv = usb_get_serial_port_data(port);
 512         priv->chiptype = CT_EARTHMATE;
 513         /* All Earthmate devices use the separated-count packet
 514            format!  Idiotic. */
 515         priv->pkt_fmt = packet_format_1;
 516         if (serial->dev->descriptor.idProduct !=
 517                                 cpu_to_le16(PRODUCT_ID_EARTHMATEUSB)) {
 518                 /* The old original USB Earthmate seemed able to
 519                    handle GET_CONFIG requests; everything they've
 520                    produced since that time crashes if this command is
 521                    attempted :-( */
 522                 dev_dbg(&port->dev,
 523                         "%s - Marking this device as unsafe for GET_CONFIG commands\n",
 524                         __func__);
 525                 priv->get_cfg_unsafe = !0;
 526         }
 527
 528         return 0;
 529 }
 530
 531 static int cypress_hidcom_port_probe(struct usb_serial_port *port)
 532 {
 533         struct cypress_private *priv;
 534         int ret;
 535
 536         ret = cypress_generic_port_probe(port);
 537         if (ret) {
 538                 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
 539                 return ret;
 540         }
 541
 542         priv = usb_get_serial_port_data(port);
 543         priv->chiptype = CT_CYPHIDCOM;
 544
 545         return 0;
 546 }
 547
 548 static int cypress_ca42v2_port_probe(struct usb_serial_port *port)
 549 {
 550         struct cypress_private *priv;
 551         int ret;
 552
 553         ret = cypress_generic_port_probe(port);
 554         if (ret) {
 555                 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
 556                 return ret;
 557         }
 558
 559         priv = usb_get_serial_port_data(port);
 560         priv->chiptype = CT_CA42V2;
 561
 562         return 0;
 563 }
 564
 565 static int cypress_port_remove(struct usb_serial_port *port)
 566 {
 567         struct cypress_private *priv;
 568
 569         priv = usb_get_serial_port_data(port);
 570
 571         kfifo_free(&priv->write_fifo);
 572         kfree(priv);
 573
 574         return 0;
 575 }
 576
 577 static int cypress_open(struct tty_struct *tty, struct usb_serial_port *port)
 578 {
 579         struct cypress_private *priv = usb_get_serial_port_data(port);
 580         struct usb_serial *serial = port->serial;
 581         unsigned long flags;
 582         int result = 0;
 583
 584         if (!priv->comm_is_ok)
 585                 return -EIO;
 586
 587         /* clear halts before open */
 588         usb_clear_halt(serial->dev, 0x81);
 589         usb_clear_halt(serial->dev, 0x02);
 590
 591         spin_lock_irqsave(&priv->lock, flags);
 592         /* reset read/write statistics */
 593         priv->bytes_in = 0;
 594         priv->bytes_out = 0;
 595         priv->cmd_count = 0;
 596         priv->rx_flags = 0;
 597         spin_unlock_irqrestore(&priv->lock, flags);
 598
 599         /* Set termios */
 600         cypress_send(port);
 601
 602         if (tty)
 603                 cypress_set_termios(tty, port, NULL);
 604
 605         /* setup the port and start reading from the device */
 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
 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         spin_lock_irqsave(&priv->lock, flags);
 643         kfifo_reset_out(&priv->write_fifo);
 644         spin_unlock_irqrestore(&priv->lock, flags);
 645
 646         dev_dbg(&port->dev, "%s - stopping urbs\n", __func__);
 647         usb_kill_urb(port->interrupt_in_urb);
 648         usb_kill_urb(port->interrupt_out_urb);
 649
 650         if (stats)
 651                 dev_info(&port->dev, "Statistics: %d Bytes In | %d Bytes Out | %d Commands Issued\n",
 652                         priv->bytes_in, priv->bytes_out, priv->cmd_count);
 653 } /* cypress_close */
 654
 655
 656 static int cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
 657                                         const unsigned char *buf, int count)
 658 {
 659         struct cypress_private *priv = usb_get_serial_port_data(port);
 660
 661         dev_dbg(&port->dev, "%s - %d bytes\n", __func__, count);
 662
 663         /* line control commands, which need to be executed immediately,
 664            are not put into the buffer for obvious reasons.
 665          */
 666         if (priv->cmd_ctrl) {
 667                 count = 0;
 668                 goto finish;
 669         }
 670
 671         if (!count)
 672                 return count;
 673
 674         count = kfifo_in_locked(&priv->write_fifo, buf, count, &priv->lock);
 675
 676 finish:
 677         cypress_send(port);
 678
 679         return count;
 680 } /* cypress_write */
 681
 682
 683 static void cypress_send(struct usb_serial_port *port)
 684 {
 685         int count = 0, result, offset, actual_size;
 686         struct cypress_private *priv = usb_get_serial_port_data(port);
 687         struct device *dev = &port->dev;
 688         unsigned long flags;
 689
 690         if (!priv->comm_is_ok)
 691                 return;
 692
 693         dev_dbg(dev, "%s - interrupt out size is %d\n", __func__,
 694                 port->interrupt_out_size);
 695
 696         spin_lock_irqsave(&priv->lock, flags);
 697         if (priv->write_urb_in_use) {
 698                 dev_dbg(dev, "%s - can't write, urb in use\n", __func__);
 699                 spin_unlock_irqrestore(&priv->lock, flags);
 700                 return;
 701         }
 702         spin_unlock_irqrestore(&priv->lock, flags);
 703
 704         /* clear buffer */
 705         memset(port->interrupt_out_urb->transfer_buffer, 0,
 706                                                 port->interrupt_out_size);
 707
 708         spin_lock_irqsave(&priv->lock, flags);
 709         switch (priv->pkt_fmt) {
 710         default:
 711         case packet_format_1:
 712                 /* this is for the CY7C64013... */
 713                 offset = 2;
 714                 port->interrupt_out_buffer[0] = priv->line_control;
 715                 break;
 716         case packet_format_2:
 717                 /* this is for the CY7C63743... */
 718                 offset = 1;
 719                 port->interrupt_out_buffer[0] = priv->line_control;
 720                 break;
 721         }
 722
 723         if (priv->line_control & CONTROL_RESET)
 724                 priv->line_control &= ~CONTROL_RESET;
 725
 726         if (priv->cmd_ctrl) {
 727                 priv->cmd_count++;
 728                 dev_dbg(dev, "%s - line control command being issued\n", __func__);
 729                 spin_unlock_irqrestore(&priv->lock, flags);
 730                 goto send;
 731         } else
 732                 spin_unlock_irqrestore(&priv->lock, flags);
 733
 734         count = kfifo_out_locked(&priv->write_fifo,
 735                                         &port->interrupt_out_buffer[offset],
 736                                         port->interrupt_out_size - offset,
 737                                         &priv->lock);
 738         if (count == 0)
 739                 return;
 740
 741         switch (priv->pkt_fmt) {
 742         default:
 743         case packet_format_1:
 744                 port->interrupt_out_buffer[1] = count;
 745                 break;
 746         case packet_format_2:
 747                 port->interrupt_out_buffer[0] |= count;
 748         }
 749
 750         dev_dbg(dev, "%s - count is %d\n", __func__, count);
 751
 752 send:
 753         spin_lock_irqsave(&priv->lock, flags);
 754         priv->write_urb_in_use = 1;
 755         spin_unlock_irqrestore(&priv->lock, flags);
 756
 757         if (priv->cmd_ctrl)
 758                 actual_size = 1;
 759         else
 760                 actual_size = count +
 761                               (priv->pkt_fmt == packet_format_1 ? 2 : 1);
 762
 763         usb_serial_debug_data(dev, __func__, port->interrupt_out_size,
 764                               port->interrupt_out_urb->transfer_buffer);
 765
 766         usb_fill_int_urb(port->interrupt_out_urb, port->serial->dev,
 767                 usb_sndintpipe(port->serial->dev, port->interrupt_out_endpointAddress),
 768                 port->interrupt_out_buffer, actual_size,
 769                 cypress_write_int_callback, port, priv->write_urb_interval);
 770         result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC);
 771         if (result) {
 772                 dev_err_console(port,
 773                                 "%s - failed submitting write urb, error %d\n",
 774                                                         __func__, result);
 775                 priv->write_urb_in_use = 0;
 776                 cypress_set_dead(port);
 777         }
 778
 779         spin_lock_irqsave(&priv->lock, flags);
 780         if (priv->cmd_ctrl)
 781                 priv->cmd_ctrl = 0;
 782
 783         /* do not count the line control and size bytes */
 784         priv->bytes_out += count;
 785         spin_unlock_irqrestore(&priv->lock, flags);
 786
 787         usb_serial_port_softint(port);
 788 } /* cypress_send */
 789
 790
 791 /* returns how much space is available in the soft buffer */
 792 static int cypress_write_room(struct tty_struct *tty)
 793 {
 794         struct usb_serial_port *port = tty->driver_data;
 795         struct cypress_private *priv = usb_get_serial_port_data(port);
 796         int room = 0;
 797         unsigned long flags;
 798
 799         spin_lock_irqsave(&priv->lock, flags);
 800         room = kfifo_avail(&priv->write_fifo);
 801         spin_unlock_irqrestore(&priv->lock, flags);
 802
 803         dev_dbg(&port->dev, "%s - returns %d\n", __func__, room);
 804         return room;
 805 }
 806
 807
 808 static int cypress_tiocmget(struct tty_struct *tty)
 809 {
 810         struct usb_serial_port *port = tty->driver_data;
 811         struct cypress_private *priv = usb_get_serial_port_data(port);
 812         __u8 status, control;
 813         unsigned int result = 0;
 814         unsigned long flags;
 815
 816         spin_lock_irqsave(&priv->lock, flags);
 817         control = priv->line_control;
 818         status = priv->current_status;
 819         spin_unlock_irqrestore(&priv->lock, flags);
 820
 821         result = ((control & CONTROL_DTR)        ? TIOCM_DTR : 0)
 822                 | ((control & CONTROL_RTS)       ? TIOCM_RTS : 0)
 823                 | ((status & UART_CTS)        ? TIOCM_CTS : 0)
 824                 | ((status & UART_DSR)        ? TIOCM_DSR : 0)
 825                 | ((status & UART_RI)         ? TIOCM_RI  : 0)
 826                 | ((status & UART_CD)         ? TIOCM_CD  : 0);
 827
 828         dev_dbg(&port->dev, "%s - result = %x\n", __func__, result);
 829
 830         return result;
 831 }
 832
 833
 834 static int cypress_tiocmset(struct tty_struct *tty,
 835                                unsigned int set, unsigned int clear)
 836 {
 837         struct usb_serial_port *port = tty->driver_data;
 838         struct cypress_private *priv = usb_get_serial_port_data(port);
 839         unsigned long flags;
 840
 841         spin_lock_irqsave(&priv->lock, flags);
 842         if (set & TIOCM_RTS)
 843                 priv->line_control |= CONTROL_RTS;
 844         if (set & TIOCM_DTR)
 845                 priv->line_control |= CONTROL_DTR;
 846         if (clear & TIOCM_RTS)
 847                 priv->line_control &= ~CONTROL_RTS;
 848         if (clear & TIOCM_DTR)
 849                 priv->line_control &= ~CONTROL_DTR;
 850         priv->cmd_ctrl = 1;
 851         spin_unlock_irqrestore(&priv->lock, flags);
 852
 853         return cypress_write(tty, port, NULL, 0);
 854 }
 855
 856 static void cypress_earthmate_init_termios(struct tty_struct *tty)
 857 {
 858         tty_encode_baud_rate(tty, 4800, 4800);
 859 }
 860
 861 static void cypress_set_termios(struct tty_struct *tty,
 862         struct usb_serial_port *port, struct ktermios *old_termios)
 863 {
 864         struct cypress_private *priv = usb_get_serial_port_data(port);
 865         struct device *dev = &port->dev;
 866         int data_bits, stop_bits, parity_type, parity_enable;
 867         unsigned int cflag;
 868         unsigned long flags;
 869         __u8 oldlines;
 870         int linechange = 0;
 871
 872         /* Unsupported features need clearing */
 873         tty->termios.c_cflag &= ~(CMSPAR|CRTSCTS);
 874
 875         cflag = tty->termios.c_cflag;
 876
 877         /* set number of data bits, parity, stop bits */
 878         /* when parity is disabled the parity type bit is ignored */
 879
 880         /* 1 means 2 stop bits, 0 means 1 stop bit */
 881         stop_bits = cflag & CSTOPB ? 1 : 0;
 882
 883         if (cflag & PARENB) {
 884                 parity_enable = 1;
 885                 /* 1 means odd parity, 0 means even parity */
 886                 parity_type = cflag & PARODD ? 1 : 0;
 887         } else
 888                 parity_enable = parity_type = 0;
 889
 890         switch (cflag & CSIZE) {
 891         case CS5:
 892                 data_bits = 0;
 893                 break;
 894         case CS6:
 895                 data_bits = 1;
 896                 break;
 897         case CS7:
 898                 data_bits = 2;
 899                 break;
 900         case CS8:
 901                 data_bits = 3;
 902                 break;
 903         default:
 904                 dev_err(dev, "%s - CSIZE was set, but not CS5-CS8\n", __func__);
 905                 data_bits = 3;
 906         }
 907         spin_lock_irqsave(&priv->lock, flags);
 908         oldlines = priv->line_control;
 909         if ((cflag & CBAUD) == B0) {
 910                 /* drop dtr and rts */
 911                 dev_dbg(dev, "%s - dropping the lines, baud rate 0bps\n", __func__);
 912                 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
 913         } else
 914                 priv->line_control = (CONTROL_DTR | CONTROL_RTS);
 915         spin_unlock_irqrestore(&priv->lock, flags);
 916
 917         dev_dbg(dev, "%s - sending %d stop_bits, %d parity_enable, %d parity_type, %d data_bits (+5)\n",
 918                 __func__, stop_bits, parity_enable, parity_type, data_bits);
 919
 920         cypress_serial_control(tty, port, tty_get_baud_rate(tty),
 921                         data_bits, stop_bits,
 922                         parity_enable, parity_type,
 923                         0, CYPRESS_SET_CONFIG);
 924
 925         /* we perform a CYPRESS_GET_CONFIG so that the current settings are
 926          * filled into the private structure this should confirm that all is
 927          * working if it returns what we just set */
 928         cypress_serial_control(tty, port, 0, 0, 0, 0, 0, 0, CYPRESS_GET_CONFIG);
 929
 930         /* Here we can define custom tty settings for devices; the main tty
 931          * termios flag base comes from empeg.c */
 932
 933         spin_lock_irqsave(&priv->lock, flags);
 934         if (priv->chiptype == CT_EARTHMATE && priv->baud_rate == 4800) {
 935                 dev_dbg(dev, "Using custom termios settings for a baud rate of 4800bps.\n");
 936                 /* define custom termios settings for NMEA protocol */
 937
 938                 tty->termios.c_iflag /* input modes - */
 939                         &= ~(IGNBRK  /* disable ignore break */
 940                         | BRKINT     /* disable break causes interrupt */
 941                         | PARMRK     /* disable mark parity errors */
 942                         | ISTRIP     /* disable clear high bit of input char */
 943                         | INLCR      /* disable translate NL to CR */
 944                         | IGNCR      /* disable ignore CR */
 945                         | ICRNL      /* disable translate CR to NL */
 946                         | IXON);     /* disable enable XON/XOFF flow control */
 947
 948                 tty->termios.c_oflag /* output modes */
 949                         &= ~OPOST;    /* disable postprocess output char */
 950
 951                 tty->termios.c_lflag /* line discipline modes */
 952                         &= ~(ECHO     /* disable echo input characters */
 953                         | ECHONL      /* disable echo new line */
 954                         | ICANON      /* disable erase, kill, werase, and rprnt
 955                                          special characters */
 956                         | ISIG        /* disable interrupt, quit, and suspend
 957                                          special characters */
 958                         | IEXTEN);    /* disable non-POSIX special characters */
 959         } /* CT_CYPHIDCOM: Application should handle this for device */
 960
 961         linechange = (priv->line_control != oldlines);
 962         spin_unlock_irqrestore(&priv->lock, flags);
 963
 964         /* if necessary, set lines */
 965         if (linechange) {
 966                 priv->cmd_ctrl = 1;
 967                 cypress_write(tty, port, NULL, 0);
 968         }
 969 } /* cypress_set_termios */
 970
 971
 972 /* returns amount of data still left in soft buffer */
 973 static int cypress_chars_in_buffer(struct tty_struct *tty)
 974 {
 975         struct usb_serial_port *port = tty->driver_data;
 976         struct cypress_private *priv = usb_get_serial_port_data(port);
 977         int chars = 0;
 978         unsigned long flags;
 979
 980         spin_lock_irqsave(&priv->lock, flags);
 981         chars = kfifo_len(&priv->write_fifo);
 982         spin_unlock_irqrestore(&priv->lock, flags);
 983
 984         dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
 985         return chars;
 986 }
 987
 988
 989 static void cypress_throttle(struct tty_struct *tty)
 990 {
 991         struct usb_serial_port *port = tty->driver_data;
 992         struct cypress_private *priv = usb_get_serial_port_data(port);
 993
 994         spin_lock_irq(&priv->lock);
 995         priv->rx_flags = THROTTLED;
 996         spin_unlock_irq(&priv->lock);
 997 }
 998
 999
1000 static void cypress_unthrottle(struct tty_struct *tty)
1001 {
1002         struct usb_serial_port *port = tty->driver_data;
1003         struct cypress_private *priv = usb_get_serial_port_data(port);
1004         int actually_throttled, result;
1005
1006         spin_lock_irq(&priv->lock);
1007         actually_throttled = priv->rx_flags & ACTUALLY_THROTTLED;
1008         priv->rx_flags = 0;
1009         spin_unlock_irq(&priv->lock);
1010
1011         if (!priv->comm_is_ok)
1012                 return;
1013
1014         if (actually_throttled) {
1015                 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
1016                 if (result) {
1017                         dev_err(&port->dev, "%s - failed submitting read urb, "
1018                                         "error %d\n", __func__, result);
1019                         cypress_set_dead(port);
1020                 }
1021         }
1022 }
1023
1024
1025 static void cypress_read_int_callback(struct urb *urb)
1026 {
1027         struct usb_serial_port *port = urb->context;
1028         struct cypress_private *priv = usb_get_serial_port_data(port);
1029         struct device *dev = &urb->dev->dev;
1030         struct tty_struct *tty;
1031         unsigned char *data = urb->transfer_buffer;
1032         unsigned long flags;
1033         char tty_flag = TTY_NORMAL;
1034         int bytes = 0;
1035         int result;
1036         int i = 0;
1037         int status = urb->status;
1038
1039         switch (status) {
1040         case 0: /* success */
1041                 break;
1042         case -ECONNRESET:
1043         case -ENOENT:
1044         case -ESHUTDOWN:
1045                 /* precursor to disconnect so just go away */
1046                 return;
1047         case -EPIPE:
1048                 /* Can't call usb_clear_halt while in_interrupt */
1049                 /* FALLS THROUGH */
1050         default:
1051                 /* something ugly is going on... */
1052                 dev_err(dev, "%s - unexpected nonzero read status received: %d\n",
1053                         __func__, status);
1054                 cypress_set_dead(port);
1055                 return;
1056         }
1057
1058         spin_lock_irqsave(&priv->lock, flags);
1059         if (priv->rx_flags & THROTTLED) {
1060                 dev_dbg(dev, "%s - now throttling\n", __func__);
1061                 priv->rx_flags |= ACTUALLY_THROTTLED;
1062                 spin_unlock_irqrestore(&priv->lock, flags);
1063                 return;
1064         }
1065         spin_unlock_irqrestore(&priv->lock, flags);
1066
1067         tty = tty_port_tty_get(&port->port);
1068         if (!tty) {
1069                 dev_dbg(dev, "%s - bad tty pointer - exiting\n", __func__);
1070                 return;
1071         }
1072
1073         spin_lock_irqsave(&priv->lock, flags);
1074         result = urb->actual_length;
1075         switch (priv->pkt_fmt) {
1076         default:
1077         case packet_format_1:
1078                 /* This is for the CY7C64013... */
1079                 priv->current_status = data[0] & 0xF8;
1080                 bytes = data[1] + 2;
1081                 i = 2;
1082                 break;
1083         case packet_format_2:
1084                 /* This is for the CY7C63743... */
1085                 priv->current_status = data[0] & 0xF8;
1086                 bytes = (data[0] & 0x07) + 1;
1087                 i = 1;
1088                 break;
1089         }
1090         spin_unlock_irqrestore(&priv->lock, flags);
1091         if (result < bytes) {
1092                 dev_dbg(dev,
1093                         "%s - wrong packet size - received %d bytes but packet said %d bytes\n",
1094                         __func__, result, bytes);
1095                 goto continue_read;
1096         }
1097
1098         usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
1099
1100         spin_lock_irqsave(&priv->lock, flags);
1101         /* check to see if status has changed */
1102         if (priv->current_status != priv->prev_status) {
1103                 u8 delta = priv->current_status ^ priv->prev_status;
1104
1105                 if (delta & UART_MSR_MASK) {
1106                         if (delta & UART_CTS)
1107                                 port->icount.cts++;
1108                         if (delta & UART_DSR)
1109                                 port->icount.dsr++;
1110                         if (delta & UART_RI)
1111                                 port->icount.rng++;
1112                         if (delta & UART_CD)
1113                                 port->icount.dcd++;
1114
1115                         wake_up_interruptible(&port->port.delta_msr_wait);
1116                 }
1117
1118                 priv->prev_status = priv->current_status;
1119         }
1120         spin_unlock_irqrestore(&priv->lock, flags);
1121
1122         /* hangup, as defined in acm.c... this might be a bad place for it
1123          * though */
1124         if (tty && !C_CLOCAL(tty) && !(priv->current_status & UART_CD)) {
1125                 dev_dbg(dev, "%s - calling hangup\n", __func__);
1126                 tty_hangup(tty);
1127                 goto continue_read;
1128         }
1129
1130         /* There is one error bit... I'm assuming it is a parity error
1131          * indicator as the generic firmware will set this bit to 1 if a
1132          * parity error occurs.
1133          * I can not find reference to any other error events. */
1134         spin_lock_irqsave(&priv->lock, flags);
1135         if (priv->current_status & CYP_ERROR) {
1136                 spin_unlock_irqrestore(&priv->lock, flags);
1137                 tty_flag = TTY_PARITY;
1138                 dev_dbg(dev, "%s - Parity Error detected\n", __func__);
1139         } else
1140                 spin_unlock_irqrestore(&priv->lock, flags);
1141
1142         /* process read if there is data other than line status */
1143         if (bytes > i) {
1144                 tty_insert_flip_string_fixed_flag(&port->port, data + i,
1145                                 tty_flag, bytes - i);
1146                 tty_flip_buffer_push(&port->port);
1147         }
1148
1149         spin_lock_irqsave(&priv->lock, flags);
1150         /* control and status byte(s) are also counted */
1151         priv->bytes_in += bytes;
1152         spin_unlock_irqrestore(&priv->lock, flags);
1153
1154 continue_read:
1155         tty_kref_put(tty);
1156
1157         /* Continue trying to always read */
1158
1159         if (priv->comm_is_ok) {
1160                 usb_fill_int_urb(port->interrupt_in_urb, port->serial->dev,
1161                                 usb_rcvintpipe(port->serial->dev,
1162                                         port->interrupt_in_endpointAddress),
1163                                 port->interrupt_in_urb->transfer_buffer,
1164                                 port->interrupt_in_urb->transfer_buffer_length,
1165                                 cypress_read_int_callback, port,
1166                                 priv->read_urb_interval);
1167                 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
1168                 if (result && result != -EPERM) {
1169                         dev_err(dev, "%s - failed resubmitting read urb, error %d\n",
1170                                 __func__, result);
1171                         cypress_set_dead(port);
1172                 }
1173         }
1174 } /* cypress_read_int_callback */
1175
1176
1177 static void cypress_write_int_callback(struct urb *urb)
1178 {
1179         struct usb_serial_port *port = urb->context;
1180         struct cypress_private *priv = usb_get_serial_port_data(port);
1181         struct device *dev = &urb->dev->dev;
1182         int status = urb->status;
1183
1184         switch (status) {
1185         case 0:
1186                 /* success */
1187                 break;
1188         case -ECONNRESET:
1189         case -ENOENT:
1190         case -ESHUTDOWN:
1191                 /* this urb is terminated, clean up */
1192                 dev_dbg(dev, "%s - urb shutting down with status: %d\n",
1193                         __func__, status);
1194                 priv->write_urb_in_use = 0;
1195                 return;
1196         case -EPIPE:
1197                 /* Cannot call usb_clear_halt while in_interrupt */
1198                 /* FALLTHROUGH */
1199         default:
1200                 dev_err(dev, "%s - unexpected nonzero write status received: %d\n",
1201                         __func__, status);
1202                 cypress_set_dead(port);
1203                 break;
1204         }
1205         priv->write_urb_in_use = 0;
1206
1207         /* send any buffered data */
1208         cypress_send(port);
1209 }
1210
1211 module_usb_serial_driver(serial_drivers, id_table_combined);
1212
1213 MODULE_AUTHOR(DRIVER_AUTHOR);
1214 MODULE_DESCRIPTION(DRIVER_DESC);
1215 MODULE_LICENSE("GPL");
1216
1217 module_param(stats, bool, S_IRUGO | S_IWUSR);
1218 MODULE_PARM_DESC(stats, "Enable statistics or not");
1219 module_param(interval, int, S_IRUGO | S_IWUSR);
1220 MODULE_PARM_DESC(interval, "Overrides interrupt interval");
1221 module_param(unstable_bauds, bool, S_IRUGO | S_IWUSR);
1222 MODULE_PARM_DESC(unstable_bauds, "Allow unstable baud rates");