drivers/usb/serial/cypress_m8.c

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