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_SAI, PRODUCT_ID_CYPHIDCOM) },
  63         { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) },
  64         { USB_DEVICE(VENDOR_ID_FRWD, PRODUCT_ID_CYPHIDCOM_FRWD) },
  65         { }                                             /* Terminating entry */
  66 };
  67
  68 static const struct usb_device_id id_table_nokiaca42v2[] = {
  69         { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
  70         { }                                             /* Terminating entry */
  71 };
  72
  73 static const struct usb_device_id id_table_combined[] = {
  74         { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
  75         { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
  76         { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
  77         { USB_DEVICE(VENDOR_ID_SAI, PRODUCT_ID_CYPHIDCOM) },
  78         { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) },
  79         { USB_DEVICE(VENDOR_ID_FRWD, PRODUCT_ID_CYPHIDCOM_FRWD) },
  80         { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
  81         { }                                             /* Terminating entry */
  82 };
  83
  84 MODULE_DEVICE_TABLE(usb, id_table_combined);
  85
  86 enum packet_format {
  87         packet_format_1,  /* b0:status, b1:payload count */
  88         packet_format_2   /* b0[7:3]:status, b0[2:0]:payload count */
  89 };
  90
  91 struct cypress_private {
  92         spinlock_t lock;                   /* private lock */
  93         int chiptype;                      /* identifier of device, for quirks/etc */
  94         int bytes_in;                      /* used for statistics */
  95         int bytes_out;                     /* used for statistics */
  96         int cmd_count;                     /* used for statistics */
  97         int cmd_ctrl;                      /* always set this to 1 before issuing a command */
  98         struct kfifo write_fifo;           /* write fifo */
  99         int write_urb_in_use;              /* write urb in use indicator */
 100         int write_urb_interval;            /* interval to use for write urb */
 101         int read_urb_interval;             /* interval to use for read urb */
 102         int comm_is_ok;                    /* true if communication is (still) ok */
 103         __u8 line_control;                 /* holds dtr / rts value */
 104         __u8 current_status;               /* received from last read - info on dsr,cts,cd,ri,etc */
 105         __u8 current_config;               /* stores the current configuration byte */
 106         __u8 rx_flags;                     /* throttling - used from whiteheat/ftdi_sio */
 107         enum packet_format pkt_fmt;        /* format to use for packet send / receive */
 108         int get_cfg_unsafe;                /* If true, the CYPRESS_GET_CONFIG is unsafe */
 109         int baud_rate;                     /* stores current baud rate in
 110                                               integer form */
 111         char prev_status;                  /* used for TIOCMIWAIT */
 112 };
 113
 114 /* function prototypes for the Cypress USB to serial device */
 115 static int  cypress_earthmate_port_probe(struct usb_serial_port *port);
 116 static int  cypress_hidcom_port_probe(struct usb_serial_port *port);
 117 static int  cypress_ca42v2_port_probe(struct usb_serial_port *port);
 118 static void cypress_port_remove(struct usb_serial_port *port);
 119 static int  cypress_open(struct tty_struct *tty, struct usb_serial_port *port);
 120 static void cypress_close(struct usb_serial_port *port);
 121 static void cypress_dtr_rts(struct usb_serial_port *port, int on);
 122 static int  cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
 123                         const unsigned char *buf, int count);
 124 static void cypress_send(struct usb_serial_port *port);
 125 static unsigned int cypress_write_room(struct tty_struct *tty);
 126 static void cypress_earthmate_init_termios(struct tty_struct *tty);
 127 static void cypress_set_termios(struct tty_struct *tty,
 128                         struct usb_serial_port *port, struct ktermios *old);
 129 static int  cypress_tiocmget(struct tty_struct *tty);
 130 static int  cypress_tiocmset(struct tty_struct *tty,
 131                         unsigned int set, unsigned int clear);
 132 static unsigned int cypress_chars_in_buffer(struct tty_struct *tty);
 133 static void cypress_throttle(struct tty_struct *tty);
 134 static void cypress_unthrottle(struct tty_struct *tty);
 135 static void cypress_set_dead(struct usb_serial_port *port);
 136 static void cypress_read_int_callback(struct urb *urb);
 137 static void cypress_write_int_callback(struct urb *urb);
 138
 139 static struct usb_serial_driver cypress_earthmate_device = {
 140         .driver = {
 141                 .owner =                THIS_MODULE,
 142                 .name =                 "earthmate",
 143         },
 144         .description =                  "DeLorme Earthmate USB",
 145         .id_table =                     id_table_earthmate,
 146         .num_ports =                    1,
 147         .port_probe =                   cypress_earthmate_port_probe,
 148         .port_remove =                  cypress_port_remove,
 149         .open =                         cypress_open,
 150         .close =                        cypress_close,
 151         .dtr_rts =                      cypress_dtr_rts,
 152         .write =                        cypress_write,
 153         .write_room =                   cypress_write_room,
 154         .init_termios =                 cypress_earthmate_init_termios,
 155         .set_termios =                  cypress_set_termios,
 156         .tiocmget =                     cypress_tiocmget,
 157         .tiocmset =                     cypress_tiocmset,
 158         .tiocmiwait =                   usb_serial_generic_tiocmiwait,
 159         .chars_in_buffer =              cypress_chars_in_buffer,
 160         .throttle =                     cypress_throttle,
 161         .unthrottle =                   cypress_unthrottle,
 162         .read_int_callback =            cypress_read_int_callback,
 163         .write_int_callback =           cypress_write_int_callback,
 164 };
 165
 166 static struct usb_serial_driver cypress_hidcom_device = {
 167         .driver = {
 168                 .owner =                THIS_MODULE,
 169                 .name =                 "cyphidcom",
 170         },
 171         .description =                  "HID->COM RS232 Adapter",
 172         .id_table =                     id_table_cyphidcomrs232,
 173         .num_ports =                    1,
 174         .port_probe =                   cypress_hidcom_port_probe,
 175         .port_remove =                  cypress_port_remove,
 176         .open =                         cypress_open,
 177         .close =                        cypress_close,
 178         .dtr_rts =                      cypress_dtr_rts,
 179         .write =                        cypress_write,
 180         .write_room =                   cypress_write_room,
 181         .set_termios =                  cypress_set_termios,
 182         .tiocmget =                     cypress_tiocmget,
 183         .tiocmset =                     cypress_tiocmset,
 184         .tiocmiwait =                   usb_serial_generic_tiocmiwait,
 185         .chars_in_buffer =              cypress_chars_in_buffer,
 186         .throttle =                     cypress_throttle,
 187         .unthrottle =                   cypress_unthrottle,
 188         .read_int_callback =            cypress_read_int_callback,
 189         .write_int_callback =           cypress_write_int_callback,
 190 };
 191
 192 static struct usb_serial_driver cypress_ca42v2_device = {
 193         .driver = {
 194                 .owner =                THIS_MODULE,
 195                 .name =                 "nokiaca42v2",
 196         },
 197         .description =                  "Nokia CA-42 V2 Adapter",
 198         .id_table =                     id_table_nokiaca42v2,
 199         .num_ports =                    1,
 200         .port_probe =                   cypress_ca42v2_port_probe,
 201         .port_remove =                  cypress_port_remove,
 202         .open =                         cypress_open,
 203         .close =                        cypress_close,
 204         .dtr_rts =                      cypress_dtr_rts,
 205         .write =                        cypress_write,
 206         .write_room =                   cypress_write_room,
 207         .set_termios =                  cypress_set_termios,
 208         .tiocmget =                     cypress_tiocmget,
 209         .tiocmset =                     cypress_tiocmset,
 210         .tiocmiwait =                   usb_serial_generic_tiocmiwait,
 211         .chars_in_buffer =              cypress_chars_in_buffer,
 212         .throttle =                     cypress_throttle,
 213         .unthrottle =                   cypress_unthrottle,
 214         .read_int_callback =            cypress_read_int_callback,
 215         .write_int_callback =           cypress_write_int_callback,
 216 };
 217
 218 static struct usb_serial_driver * const serial_drivers[] = {
 219         &cypress_earthmate_device, &cypress_hidcom_device,
 220         &cypress_ca42v2_device, NULL
 221 };
 222
 223 /*****************************************************************************
 224  * Cypress serial helper functions
 225  *****************************************************************************/
 226
 227 /* FRWD Dongle hidcom needs to skip reset and speed checks */
 228 static inline bool is_frwd(struct usb_device *dev)
 229 {
 230         return ((le16_to_cpu(dev->descriptor.idVendor) == VENDOR_ID_FRWD) &&
 231                 (le16_to_cpu(dev->descriptor.idProduct) == PRODUCT_ID_CYPHIDCOM_FRWD));
 232 }
 233
 234 static int analyze_baud_rate(struct usb_serial_port *port, speed_t new_rate)
 235 {
 236         struct cypress_private *priv;
 237         priv = usb_get_serial_port_data(port);
 238
 239         if (unstable_bauds)
 240                 return new_rate;
 241
 242         /* FRWD Dongle uses 115200 bps */
 243         if (is_frwd(port->serial->dev))
 244                 return new_rate;
 245
 246         /*
 247          * The general purpose firmware for the Cypress M8 allows for
 248          * a maximum speed of 57600bps (I have no idea whether DeLorme
 249          * chose to use the general purpose firmware or not), if you
 250          * need to modify this speed setting for your own project
 251          * please add your own chiptype and modify the code likewise.
 252          * The Cypress HID->COM device will work successfully up to
 253          * 115200bps (but the actual throughput is around 3kBps).
 254          */
 255         if (port->serial->dev->speed == USB_SPEED_LOW) {
 256                 /*
 257                  * Mike Isely <isely@pobox.com> 2-Feb-2008: The
 258                  * Cypress app note that describes this mechanism
 259                  * states the the low-speed part can't handle more
 260                  * than 800 bytes/sec, in which case 4800 baud is the
 261                  * safest speed for a part like that.
 262                  */
 263                 if (new_rate > 4800) {
 264                         dev_dbg(&port->dev,
 265                                 "%s - failed setting baud rate, device incapable speed %d\n",
 266                                 __func__, new_rate);
 267                         return -1;
 268                 }
 269         }
 270         switch (priv->chiptype) {
 271         case CT_EARTHMATE:
 272                 if (new_rate <= 600) {
 273                         /* 300 and 600 baud rates are supported under
 274                          * the generic firmware, but are not used with
 275                          * NMEA and SiRF protocols */
 276                         dev_dbg(&port->dev,
 277                                 "%s - failed setting baud rate, unsupported speed of %d on Earthmate GPS\n",
 278                                 __func__, new_rate);
 279                         return -1;
 280                 }
 281                 break;
 282         default:
 283                 break;
 284         }
 285         return new_rate;
 286 }
 287
 288
 289 /* This function can either set or retrieve the current serial line settings */
 290 static int cypress_serial_control(struct tty_struct *tty,
 291         struct usb_serial_port *port, speed_t baud_rate, int data_bits,
 292         int stop_bits, int parity_enable, int parity_type, int reset,
 293         int cypress_request_type)
 294 {
 295         int new_baudrate = 0, retval = 0, tries = 0;
 296         struct cypress_private *priv;
 297         struct device *dev = &port->dev;
 298         u8 *feature_buffer;
 299         const unsigned int feature_len = 5;
 300         unsigned long flags;
 301
 302         priv = usb_get_serial_port_data(port);
 303
 304         if (!priv->comm_is_ok)
 305                 return -ENODEV;
 306
 307         feature_buffer = kcalloc(feature_len, sizeof(u8), GFP_KERNEL);
 308         if (!feature_buffer)
 309                 return -ENOMEM;
 310
 311         switch (cypress_request_type) {
 312         case CYPRESS_SET_CONFIG:
 313                 /* 0 means 'Hang up' so doesn't change the true bit rate */
 314                 new_baudrate = priv->baud_rate;
 315                 if (baud_rate && baud_rate != priv->baud_rate) {
 316                         dev_dbg(dev, "%s - baud rate is changing\n", __func__);
 317                         retval = analyze_baud_rate(port, baud_rate);
 318                         if (retval >= 0) {
 319                                 new_baudrate = retval;
 320                                 dev_dbg(dev, "%s - New baud rate set to %d\n",
 321                                         __func__, new_baudrate);
 322                         }
 323                 }
 324                 dev_dbg(dev, "%s - baud rate is being sent as %d\n", __func__,
 325                         new_baudrate);
 326
 327                 /* fill the feature_buffer with new configuration */
 328                 put_unaligned_le32(new_baudrate, feature_buffer);
 329                 feature_buffer[4] |= data_bits - 5;   /* assign data bits in 2 bit space ( max 3 ) */
 330                 /* 1 bit gap */
 331                 feature_buffer[4] |= (stop_bits << 3);   /* assign stop bits in 1 bit space */
 332                 feature_buffer[4] |= (parity_enable << 4);   /* assign parity flag in 1 bit space */
 333                 feature_buffer[4] |= (parity_type << 5);   /* assign parity type in 1 bit space */
 334                 /* 1 bit gap */
 335                 feature_buffer[4] |= (reset << 7);   /* assign reset at end of byte, 1 bit space */
 336
 337                 dev_dbg(dev, "%s - device is being sent this feature report:\n", __func__);
 338                 dev_dbg(dev, "%s - %02X - %02X - %02X - %02X - %02X\n", __func__,
 339                         feature_buffer[0], feature_buffer[1],
 340                         feature_buffer[2], feature_buffer[3],
 341                         feature_buffer[4]);
 342
 343                 do {
 344                         retval = usb_control_msg(port->serial->dev,
 345                                         usb_sndctrlpipe(port->serial->dev, 0),
 346                                         HID_REQ_SET_REPORT,
 347                                         USB_DIR_OUT | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
 348                                         0x0300, 0, feature_buffer,
 349                                         feature_len, 500);
 350
 351                         if (tries++ >= 3)
 352                                 break;
 353
 354                 } while (retval != feature_len &&
 355                          retval != -ENODEV);
 356
 357                 if (retval != feature_len) {
 358                         dev_err(dev, "%s - failed sending serial line settings - %d\n",
 359                                 __func__, retval);
 360                         cypress_set_dead(port);
 361                 } else {
 362                         spin_lock_irqsave(&priv->lock, flags);
 363                         priv->baud_rate = new_baudrate;
 364                         priv->current_config = feature_buffer[4];
 365                         spin_unlock_irqrestore(&priv->lock, flags);
 366                         /* If we asked for a speed change encode it */
 367                         if (baud_rate)
 368                                 tty_encode_baud_rate(tty,
 369                                         new_baudrate, new_baudrate);
 370                 }
 371         break;
 372         case CYPRESS_GET_CONFIG:
 373                 if (priv->get_cfg_unsafe) {
 374                         /* Not implemented for this device,
 375                            and if we try to do it we're likely
 376                            to crash the hardware. */
 377                         retval = -ENOTTY;
 378                         goto out;
 379                 }
 380                 dev_dbg(dev, "%s - retrieving serial line settings\n", __func__);
 381                 do {
 382                         retval = usb_control_msg(port->serial->dev,
 383                                         usb_rcvctrlpipe(port->serial->dev, 0),
 384                                         HID_REQ_GET_REPORT,
 385                                         USB_DIR_IN | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
 386                                         0x0300, 0, feature_buffer,
 387                                         feature_len, 500);
 388
 389                         if (tries++ >= 3)
 390                                 break;
 391                 } while (retval != feature_len
 392                                                 && retval != -ENODEV);
 393
 394                 if (retval != feature_len) {
 395                         dev_err(dev, "%s - failed to retrieve serial line settings - %d\n",
 396                                 __func__, retval);
 397                         cypress_set_dead(port);
 398                         goto out;
 399                 } else {
 400                         spin_lock_irqsave(&priv->lock, flags);
 401                         /* store the config in one byte, and later
 402                            use bit masks to check values */
 403                         priv->current_config = feature_buffer[4];
 404                         priv->baud_rate = get_unaligned_le32(feature_buffer);
 405                         spin_unlock_irqrestore(&priv->lock, flags);
 406                 }
 407         }
 408         spin_lock_irqsave(&priv->lock, flags);
 409         ++priv->cmd_count;
 410         spin_unlock_irqrestore(&priv->lock, flags);
 411 out:
 412         kfree(feature_buffer);
 413         return retval;
 414 } /* cypress_serial_control */
 415
 416
 417 static void cypress_set_dead(struct usb_serial_port *port)
 418 {
 419         struct cypress_private *priv = usb_get_serial_port_data(port);
 420         unsigned long flags;
 421
 422         spin_lock_irqsave(&priv->lock, flags);
 423         if (!priv->comm_is_ok) {
 424                 spin_unlock_irqrestore(&priv->lock, flags);
 425                 return;
 426         }
 427         priv->comm_is_ok = 0;
 428         spin_unlock_irqrestore(&priv->lock, flags);
 429
 430         dev_err(&port->dev, "cypress_m8 suspending failing port %d - "
 431                 "interval might be too short\n", port->port_number);
 432 }
 433
 434
 435 /*****************************************************************************
 436  * Cypress serial driver functions
 437  *****************************************************************************/
 438
 439
 440 static int cypress_generic_port_probe(struct usb_serial_port *port)
 441 {
 442         struct usb_serial *serial = port->serial;
 443         struct cypress_private *priv;
 444
 445         if (!port->interrupt_out_urb || !port->interrupt_in_urb) {
 446                 dev_err(&port->dev, "required endpoint is missing\n");
 447                 return -ENODEV;
 448         }
 449
 450         priv = kzalloc(sizeof(struct cypress_private), GFP_KERNEL);
 451         if (!priv)
 452                 return -ENOMEM;
 453
 454         priv->comm_is_ok = !0;
 455         spin_lock_init(&priv->lock);
 456         if (kfifo_alloc(&priv->write_fifo, CYPRESS_BUF_SIZE, GFP_KERNEL)) {
 457                 kfree(priv);
 458                 return -ENOMEM;
 459         }
 460
 461         /* Skip reset for FRWD device. It is a workaound:
 462            device hangs if it receives SET_CONFIGURE in Configured
 463            state. */
 464         if (!is_frwd(serial->dev))
 465                 usb_reset_configuration(serial->dev);
 466
 467         priv->cmd_ctrl = 0;
 468         priv->line_control = 0;
 469         priv->rx_flags = 0;
 470         /* Default packet format setting is determined by packet size.
 471            Anything with a size larger then 9 must have a separate
 472            count field since the 3 bit count field is otherwise too
 473            small.  Otherwise we can use the slightly more compact
 474            format.  This is in accordance with the cypress_m8 serial
 475            converter app note. */
 476         if (port->interrupt_out_size > 9)
 477                 priv->pkt_fmt = packet_format_1;
 478         else
 479                 priv->pkt_fmt = packet_format_2;
 480
 481         if (interval > 0) {
 482                 priv->write_urb_interval = interval;
 483                 priv->read_urb_interval = interval;
 484                 dev_dbg(&port->dev, "%s - read & write intervals forced to %d\n",
 485                         __func__, interval);
 486         } else {
 487                 priv->write_urb_interval = port->interrupt_out_urb->interval;
 488                 priv->read_urb_interval = port->interrupt_in_urb->interval;
 489                 dev_dbg(&port->dev, "%s - intervals: read=%d write=%d\n",
 490                         __func__, priv->read_urb_interval,
 491                         priv->write_urb_interval);
 492         }
 493         usb_set_serial_port_data(port, priv);
 494
 495         port->port.drain_delay = 256;
 496
 497         return 0;
 498 }
 499
 500
 501 static int cypress_earthmate_port_probe(struct usb_serial_port *port)
 502 {
 503         struct usb_serial *serial = port->serial;
 504         struct cypress_private *priv;
 505         int ret;
 506
 507         ret = cypress_generic_port_probe(port);
 508         if (ret) {
 509                 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
 510                 return ret;
 511         }
 512
 513         priv = usb_get_serial_port_data(port);
 514         priv->chiptype = CT_EARTHMATE;
 515         /* All Earthmate devices use the separated-count packet
 516            format!  Idiotic. */
 517         priv->pkt_fmt = packet_format_1;
 518         if (serial->dev->descriptor.idProduct !=
 519                                 cpu_to_le16(PRODUCT_ID_EARTHMATEUSB)) {
 520                 /* The old original USB Earthmate seemed able to
 521                    handle GET_CONFIG requests; everything they've
 522                    produced since that time crashes if this command is
 523                    attempted :-( */
 524                 dev_dbg(&port->dev,
 525                         "%s - Marking this device as unsafe for GET_CONFIG commands\n",
 526                         __func__);
 527                 priv->get_cfg_unsafe = !0;
 528         }
 529
 530         return 0;
 531 }
 532
 533 static int cypress_hidcom_port_probe(struct usb_serial_port *port)
 534 {
 535         struct cypress_private *priv;
 536         int ret;
 537
 538         ret = cypress_generic_port_probe(port);
 539         if (ret) {
 540                 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
 541                 return ret;
 542         }
 543
 544         priv = usb_get_serial_port_data(port);
 545         priv->chiptype = CT_CYPHIDCOM;
 546
 547         return 0;
 548 }
 549
 550 static int cypress_ca42v2_port_probe(struct usb_serial_port *port)
 551 {
 552         struct cypress_private *priv;
 553         int ret;
 554
 555         ret = cypress_generic_port_probe(port);
 556         if (ret) {
 557                 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
 558                 return ret;
 559         }
 560
 561         priv = usb_get_serial_port_data(port);
 562         priv->chiptype = CT_CA42V2;
 563
 564         return 0;
 565 }
 566
 567 static void cypress_port_remove(struct usb_serial_port *port)
 568 {
 569         struct cypress_private *priv;
 570
 571         priv = usb_get_serial_port_data(port);
 572
 573         kfifo_free(&priv->write_fifo);
 574         kfree(priv);
 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 unsigned 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         unsigned int room;
 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 %u\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         data_bits = tty_get_char_size(cflag);
 891
 892         spin_lock_irqsave(&priv->lock, flags);
 893         oldlines = priv->line_control;
 894         if ((cflag & CBAUD) == B0) {
 895                 /* drop dtr and rts */
 896                 dev_dbg(dev, "%s - dropping the lines, baud rate 0bps\n", __func__);
 897                 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
 898         } else
 899                 priv->line_control = (CONTROL_DTR | CONTROL_RTS);
 900         spin_unlock_irqrestore(&priv->lock, flags);
 901
 902         dev_dbg(dev, "%s - sending %d stop_bits, %d parity_enable, %d parity_type, %d data_bits (+5)\n",
 903                 __func__, stop_bits, parity_enable, parity_type, data_bits);
 904
 905         cypress_serial_control(tty, port, tty_get_baud_rate(tty),
 906                         data_bits, stop_bits,
 907                         parity_enable, parity_type,
 908                         0, CYPRESS_SET_CONFIG);
 909
 910         /* we perform a CYPRESS_GET_CONFIG so that the current settings are
 911          * filled into the private structure this should confirm that all is
 912          * working if it returns what we just set */
 913         cypress_serial_control(tty, port, 0, 0, 0, 0, 0, 0, CYPRESS_GET_CONFIG);
 914
 915         /* Here we can define custom tty settings for devices; the main tty
 916          * termios flag base comes from empeg.c */
 917
 918         spin_lock_irqsave(&priv->lock, flags);
 919         if (priv->chiptype == CT_EARTHMATE && priv->baud_rate == 4800) {
 920                 dev_dbg(dev, "Using custom termios settings for a baud rate of 4800bps.\n");
 921                 /* define custom termios settings for NMEA protocol */
 922
 923                 tty->termios.c_iflag /* input modes - */
 924                         &= ~(IGNBRK  /* disable ignore break */
 925                         | BRKINT     /* disable break causes interrupt */
 926                         | PARMRK     /* disable mark parity errors */
 927                         | ISTRIP     /* disable clear high bit of input char */
 928                         | INLCR      /* disable translate NL to CR */
 929                         | IGNCR      /* disable ignore CR */
 930                         | ICRNL      /* disable translate CR to NL */
 931                         | IXON);     /* disable enable XON/XOFF flow control */
 932
 933                 tty->termios.c_oflag /* output modes */
 934                         &= ~OPOST;    /* disable postprocess output char */
 935
 936                 tty->termios.c_lflag /* line discipline modes */
 937                         &= ~(ECHO     /* disable echo input characters */
 938                         | ECHONL      /* disable echo new line */
 939                         | ICANON      /* disable erase, kill, werase, and rprnt
 940                                          special characters */
 941                         | ISIG        /* disable interrupt, quit, and suspend
 942                                          special characters */
 943                         | IEXTEN);    /* disable non-POSIX special characters */
 944         } /* CT_CYPHIDCOM: Application should handle this for device */
 945
 946         linechange = (priv->line_control != oldlines);
 947         spin_unlock_irqrestore(&priv->lock, flags);
 948
 949         /* if necessary, set lines */
 950         if (linechange) {
 951                 priv->cmd_ctrl = 1;
 952                 cypress_write(tty, port, NULL, 0);
 953         }
 954 } /* cypress_set_termios */
 955
 956
 957 /* returns amount of data still left in soft buffer */
 958 static unsigned int cypress_chars_in_buffer(struct tty_struct *tty)
 959 {
 960         struct usb_serial_port *port = tty->driver_data;
 961         struct cypress_private *priv = usb_get_serial_port_data(port);
 962         unsigned int chars;
 963         unsigned long flags;
 964
 965         spin_lock_irqsave(&priv->lock, flags);
 966         chars = kfifo_len(&priv->write_fifo);
 967         spin_unlock_irqrestore(&priv->lock, flags);
 968
 969         dev_dbg(&port->dev, "%s - returns %u\n", __func__, chars);
 970         return chars;
 971 }
 972
 973
 974 static void cypress_throttle(struct tty_struct *tty)
 975 {
 976         struct usb_serial_port *port = tty->driver_data;
 977         struct cypress_private *priv = usb_get_serial_port_data(port);
 978
 979         spin_lock_irq(&priv->lock);
 980         priv->rx_flags = THROTTLED;
 981         spin_unlock_irq(&priv->lock);
 982 }
 983
 984
 985 static void cypress_unthrottle(struct tty_struct *tty)
 986 {
 987         struct usb_serial_port *port = tty->driver_data;
 988         struct cypress_private *priv = usb_get_serial_port_data(port);
 989         int actually_throttled, result;
 990
 991         spin_lock_irq(&priv->lock);
 992         actually_throttled = priv->rx_flags & ACTUALLY_THROTTLED;
 993         priv->rx_flags = 0;
 994         spin_unlock_irq(&priv->lock);
 995
 996         if (!priv->comm_is_ok)
 997                 return;
 998
 999         if (actually_throttled) {
1000                 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
1001                 if (result) {
1002                         dev_err(&port->dev, "%s - failed submitting read urb, "
1003                                         "error %d\n", __func__, result);
1004                         cypress_set_dead(port);
1005                 }
1006         }
1007 }
1008
1009
1010 static void cypress_read_int_callback(struct urb *urb)
1011 {
1012         struct usb_serial_port *port = urb->context;
1013         struct cypress_private *priv = usb_get_serial_port_data(port);
1014         struct device *dev = &urb->dev->dev;
1015         struct tty_struct *tty;
1016         unsigned char *data = urb->transfer_buffer;
1017         unsigned long flags;
1018         char tty_flag = TTY_NORMAL;
1019         int bytes = 0;
1020         int result;
1021         int i = 0;
1022         int status = urb->status;
1023
1024         switch (status) {
1025         case 0: /* success */
1026                 break;
1027         case -ECONNRESET:
1028         case -ENOENT:
1029         case -ESHUTDOWN:
1030                 /* precursor to disconnect so just go away */
1031                 return;
1032         case -EPIPE:
1033                 /* Can't call usb_clear_halt while in_interrupt */
1034                 fallthrough;
1035         default:
1036                 /* something ugly is going on... */
1037                 dev_err(dev, "%s - unexpected nonzero read status received: %d\n",
1038                         __func__, status);
1039                 cypress_set_dead(port);
1040                 return;
1041         }
1042
1043         spin_lock_irqsave(&priv->lock, flags);
1044         if (priv->rx_flags & THROTTLED) {
1045                 dev_dbg(dev, "%s - now throttling\n", __func__);
1046                 priv->rx_flags |= ACTUALLY_THROTTLED;
1047                 spin_unlock_irqrestore(&priv->lock, flags);
1048                 return;
1049         }
1050         spin_unlock_irqrestore(&priv->lock, flags);
1051
1052         tty = tty_port_tty_get(&port->port);
1053         if (!tty) {
1054                 dev_dbg(dev, "%s - bad tty pointer - exiting\n", __func__);
1055                 return;
1056         }
1057
1058         spin_lock_irqsave(&priv->lock, flags);
1059         result = urb->actual_length;
1060         switch (priv->pkt_fmt) {
1061         default:
1062         case packet_format_1:
1063                 /* This is for the CY7C64013... */
1064                 priv->current_status = data[0] & 0xF8;
1065                 bytes = data[1] + 2;
1066                 i = 2;
1067                 break;
1068         case packet_format_2:
1069                 /* This is for the CY7C63743... */
1070                 priv->current_status = data[0] & 0xF8;
1071                 bytes = (data[0] & 0x07) + 1;
1072                 i = 1;
1073                 break;
1074         }
1075         spin_unlock_irqrestore(&priv->lock, flags);
1076         if (result < bytes) {
1077                 dev_dbg(dev,
1078                         "%s - wrong packet size - received %d bytes but packet said %d bytes\n",
1079                         __func__, result, bytes);
1080                 goto continue_read;
1081         }
1082
1083         usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
1084
1085         spin_lock_irqsave(&priv->lock, flags);
1086         /* check to see if status has changed */
1087         if (priv->current_status != priv->prev_status) {
1088                 u8 delta = priv->current_status ^ priv->prev_status;
1089
1090                 if (delta & UART_MSR_MASK) {
1091                         if (delta & UART_CTS)
1092                                 port->icount.cts++;
1093                         if (delta & UART_DSR)
1094                                 port->icount.dsr++;
1095                         if (delta & UART_RI)
1096                                 port->icount.rng++;
1097                         if (delta & UART_CD)
1098                                 port->icount.dcd++;
1099
1100                         wake_up_interruptible(&port->port.delta_msr_wait);
1101                 }
1102
1103                 priv->prev_status = priv->current_status;
1104         }
1105         spin_unlock_irqrestore(&priv->lock, flags);
1106
1107         /* hangup, as defined in acm.c... this might be a bad place for it
1108          * though */
1109         if (tty && !C_CLOCAL(tty) && !(priv->current_status & UART_CD)) {
1110                 dev_dbg(dev, "%s - calling hangup\n", __func__);
1111                 tty_hangup(tty);
1112                 goto continue_read;
1113         }
1114
1115         /* There is one error bit... I'm assuming it is a parity error
1116          * indicator as the generic firmware will set this bit to 1 if a
1117          * parity error occurs.
1118          * I can not find reference to any other error events. */
1119         spin_lock_irqsave(&priv->lock, flags);
1120         if (priv->current_status & CYP_ERROR) {
1121                 spin_unlock_irqrestore(&priv->lock, flags);
1122                 tty_flag = TTY_PARITY;
1123                 dev_dbg(dev, "%s - Parity Error detected\n", __func__);
1124         } else
1125                 spin_unlock_irqrestore(&priv->lock, flags);
1126
1127         /* process read if there is data other than line status */
1128         if (bytes > i) {
1129                 tty_insert_flip_string_fixed_flag(&port->port, data + i,
1130                                 tty_flag, bytes - i);
1131                 tty_flip_buffer_push(&port->port);
1132         }
1133
1134         spin_lock_irqsave(&priv->lock, flags);
1135         /* control and status byte(s) are also counted */
1136         priv->bytes_in += bytes;
1137         spin_unlock_irqrestore(&priv->lock, flags);
1138
1139 continue_read:
1140         tty_kref_put(tty);
1141
1142         /* Continue trying to always read */
1143
1144         if (priv->comm_is_ok) {
1145                 usb_fill_int_urb(port->interrupt_in_urb, port->serial->dev,
1146                                 usb_rcvintpipe(port->serial->dev,
1147                                         port->interrupt_in_endpointAddress),
1148                                 port->interrupt_in_urb->transfer_buffer,
1149                                 port->interrupt_in_urb->transfer_buffer_length,
1150                                 cypress_read_int_callback, port,
1151                                 priv->read_urb_interval);
1152                 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
1153                 if (result && result != -EPERM) {
1154                         dev_err(dev, "%s - failed resubmitting read urb, error %d\n",
1155                                 __func__, result);
1156                         cypress_set_dead(port);
1157                 }
1158         }
1159 } /* cypress_read_int_callback */
1160
1161
1162 static void cypress_write_int_callback(struct urb *urb)
1163 {
1164         struct usb_serial_port *port = urb->context;
1165         struct cypress_private *priv = usb_get_serial_port_data(port);
1166         struct device *dev = &urb->dev->dev;
1167         int status = urb->status;
1168
1169         switch (status) {
1170         case 0:
1171                 /* success */
1172                 break;
1173         case -ECONNRESET:
1174         case -ENOENT:
1175         case -ESHUTDOWN:
1176                 /* this urb is terminated, clean up */
1177                 dev_dbg(dev, "%s - urb shutting down with status: %d\n",
1178                         __func__, status);
1179                 priv->write_urb_in_use = 0;
1180                 return;
1181         case -EPIPE:
1182                 /* Cannot call usb_clear_halt while in_interrupt */
1183                 fallthrough;
1184         default:
1185                 dev_err(dev, "%s - unexpected nonzero write status received: %d\n",
1186                         __func__, status);
1187                 cypress_set_dead(port);
1188                 break;
1189         }
1190         priv->write_urb_in_use = 0;
1191
1192         /* send any buffered data */
1193         cypress_send(port);
1194 }
1195
1196 module_usb_serial_driver(serial_drivers, id_table_combined);
1197
1198 MODULE_AUTHOR(DRIVER_AUTHOR);
1199 MODULE_DESCRIPTION(DRIVER_DESC);
1200 MODULE_LICENSE("GPL");
1201
1202 module_param(stats, bool, 0644);
1203 MODULE_PARM_DESC(stats, "Enable statistics or not");
1204 module_param(interval, int, 0644);
1205 MODULE_PARM_DESC(interval, "Overrides interrupt interval");
1206 module_param(unstable_bauds, bool, 0644);
1207 MODULE_PARM_DESC(unstable_bauds, "Allow unstable baud rates");