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 debug;
  50 static bool stats;
  51 static int interval;
  52 static bool unstable_bauds;
  53
  54 /*
  55  * Version Information
  56  */
  57 #define DRIVER_VERSION "v1.10"
  58 #define DRIVER_AUTHOR "Lonnie Mendez <dignome@gmail.com>, Neil Whelchel <koyama@firstlight.net>"
  59 #define DRIVER_DESC "Cypress USB to Serial Driver"
  60
  61 /* write buffer size defines */
  62 #define CYPRESS_BUF_SIZE        1024
  63
  64 static const struct usb_device_id id_table_earthmate[] = {
  65         { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
  66         { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
  67         { }                                             /* Terminating entry */
  68 };
  69
  70 static const struct usb_device_id id_table_cyphidcomrs232[] = {
  71         { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
  72         { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) },
  73         { }                                             /* Terminating entry */
  74 };
  75
  76 static const struct usb_device_id id_table_nokiaca42v2[] = {
  77         { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
  78         { }                                             /* Terminating entry */
  79 };
  80
  81 static const struct usb_device_id id_table_combined[] = {
  82         { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
  83         { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
  84         { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
  85         { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) },
  86         { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
  87         { }                                             /* Terminating entry */
  88 };
  89
  90 MODULE_DEVICE_TABLE(usb, id_table_combined);
  91
  92 static struct usb_driver cypress_driver = {
  93         .name =         "cypress",
  94         .disconnect =   usb_serial_disconnect,
  95         .id_table =     id_table_combined,
  96 };
  97
  98 enum packet_format {
  99         packet_format_1,  /* b0:status, b1:payload count */
 100         packet_format_2   /* b0[7:3]:status, b0[2:0]:payload count */
 101 };
 102
 103 struct cypress_private {
 104         spinlock_t lock;                   /* private lock */
 105         int chiptype;                      /* identifier of device, for quirks/etc */
 106         int bytes_in;                      /* used for statistics */
 107         int bytes_out;                     /* used for statistics */
 108         int cmd_count;                     /* used for statistics */
 109         int cmd_ctrl;                      /* always set this to 1 before issuing a command */
 110         struct kfifo write_fifo;           /* write fifo */
 111         int write_urb_in_use;              /* write urb in use indicator */
 112         int write_urb_interval;            /* interval to use for write urb */
 113         int read_urb_interval;             /* interval to use for read urb */
 114         int comm_is_ok;                    /* true if communication is (still) ok */
 115         int termios_initialized;
 116         __u8 line_control;                 /* holds dtr / rts value */
 117         __u8 current_status;               /* received from last read - info on dsr,cts,cd,ri,etc */
 118         __u8 current_config;               /* stores the current configuration byte */
 119         __u8 rx_flags;                     /* throttling - used from whiteheat/ftdi_sio */
 120         enum packet_format pkt_fmt;        /* format to use for packet send / receive */
 121         int get_cfg_unsafe;                /* If true, the CYPRESS_GET_CONFIG is unsafe */
 122         int baud_rate;                     /* stores current baud rate in
 123                                               integer form */
 124         int isthrottled;                   /* if throttled, discard reads */
 125         wait_queue_head_t delta_msr_wait;  /* used for TIOCMIWAIT */
 126         char prev_status, diff_status;     /* used for TIOCMIWAIT */
 127         /* we pass a pointer to this as the argument sent to
 128            cypress_set_termios old_termios */
 129         struct ktermios tmp_termios;       /* stores the old termios settings */
 130 };
 131
 132 /* function prototypes for the Cypress USB to serial device */
 133 static int  cypress_earthmate_startup(struct usb_serial *serial);
 134 static int  cypress_hidcom_startup(struct usb_serial *serial);
 135 static int  cypress_ca42v2_startup(struct usb_serial *serial);
 136 static void cypress_release(struct usb_serial *serial);
 137 static int  cypress_open(struct tty_struct *tty, struct usb_serial_port *port);
 138 static void cypress_close(struct usb_serial_port *port);
 139 static void cypress_dtr_rts(struct usb_serial_port *port, int on);
 140 static int  cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
 141                         const unsigned char *buf, int count);
 142 static void cypress_send(struct usb_serial_port *port);
 143 static int  cypress_write_room(struct tty_struct *tty);
 144 static int  cypress_ioctl(struct tty_struct *tty,
 145                         unsigned int cmd, unsigned long arg);
 146 static void cypress_set_termios(struct tty_struct *tty,
 147                         struct usb_serial_port *port, struct ktermios *old);
 148 static int  cypress_tiocmget(struct tty_struct *tty);
 149 static int  cypress_tiocmset(struct tty_struct *tty,
 150                         unsigned int set, unsigned int clear);
 151 static int  cypress_chars_in_buffer(struct tty_struct *tty);
 152 static void cypress_throttle(struct tty_struct *tty);
 153 static void cypress_unthrottle(struct tty_struct *tty);
 154 static void cypress_set_dead(struct usb_serial_port *port);
 155 static void cypress_read_int_callback(struct urb *urb);
 156 static void cypress_write_int_callback(struct urb *urb);
 157
 158 static struct usb_serial_driver cypress_earthmate_device = {
 159         .driver = {
 160                 .owner =                THIS_MODULE,
 161                 .name =                 "earthmate",
 162         },
 163         .description =                  "DeLorme Earthmate USB",
 164         .id_table =                     id_table_earthmate,
 165         .num_ports =                    1,
 166         .attach =                       cypress_earthmate_startup,
 167         .release =                      cypress_release,
 168         .open =                         cypress_open,
 169         .close =                        cypress_close,
 170         .dtr_rts =                      cypress_dtr_rts,
 171         .write =                        cypress_write,
 172         .write_room =                   cypress_write_room,
 173         .ioctl =                        cypress_ioctl,
 174         .set_termios =                  cypress_set_termios,
 175         .tiocmget =                     cypress_tiocmget,
 176         .tiocmset =                     cypress_tiocmset,
 177         .chars_in_buffer =              cypress_chars_in_buffer,
 178         .throttle =                     cypress_throttle,
 179         .unthrottle =                   cypress_unthrottle,
 180         .read_int_callback =            cypress_read_int_callback,
 181         .write_int_callback =           cypress_write_int_callback,
 182 };
 183
 184 static struct usb_serial_driver cypress_hidcom_device = {
 185         .driver = {
 186                 .owner =                THIS_MODULE,
 187                 .name =                 "cyphidcom",
 188         },
 189         .description =                  "HID->COM RS232 Adapter",
 190         .id_table =                     id_table_cyphidcomrs232,
 191         .num_ports =                    1,
 192         .attach =                       cypress_hidcom_startup,
 193         .release =                      cypress_release,
 194         .open =                         cypress_open,
 195         .close =                        cypress_close,
 196         .dtr_rts =                      cypress_dtr_rts,
 197         .write =                        cypress_write,
 198         .write_room =                   cypress_write_room,
 199         .ioctl =                        cypress_ioctl,
 200         .set_termios =                  cypress_set_termios,
 201         .tiocmget =                     cypress_tiocmget,
 202         .tiocmset =                     cypress_tiocmset,
 203         .chars_in_buffer =              cypress_chars_in_buffer,
 204         .throttle =                     cypress_throttle,
 205         .unthrottle =                   cypress_unthrottle,
 206         .read_int_callback =            cypress_read_int_callback,
 207         .write_int_callback =           cypress_write_int_callback,
 208 };
 209
 210 static struct usb_serial_driver cypress_ca42v2_device = {
 211         .driver = {
 212                 .owner =                THIS_MODULE,
 213                 .name =                 "nokiaca42v2",
 214         },
 215         .description =                  "Nokia CA-42 V2 Adapter",
 216         .id_table =                     id_table_nokiaca42v2,
 217         .num_ports =                    1,
 218         .attach =                       cypress_ca42v2_startup,
 219         .release =                      cypress_release,
 220         .open =                         cypress_open,
 221         .close =                        cypress_close,
 222         .dtr_rts =                      cypress_dtr_rts,
 223         .write =                        cypress_write,
 224         .write_room =                   cypress_write_room,
 225         .ioctl =                        cypress_ioctl,
 226         .set_termios =                  cypress_set_termios,
 227         .tiocmget =                     cypress_tiocmget,
 228         .tiocmset =                     cypress_tiocmset,
 229         .chars_in_buffer =              cypress_chars_in_buffer,
 230         .throttle =                     cypress_throttle,
 231         .unthrottle =                   cypress_unthrottle,
 232         .read_int_callback =            cypress_read_int_callback,
 233         .write_int_callback =           cypress_write_int_callback,
 234 };
 235
 236 static struct usb_serial_driver * const serial_drivers[] = {
 237         &cypress_earthmate_device, &cypress_hidcom_device,
 238         &cypress_ca42v2_device, NULL
 239 };
 240
 241 /*****************************************************************************
 242  * Cypress serial helper functions
 243  *****************************************************************************/
 244
 245
 246 static int analyze_baud_rate(struct usb_serial_port *port, speed_t new_rate)
 247 {
 248         struct cypress_private *priv;
 249         priv = usb_get_serial_port_data(port);
 250
 251         if (unstable_bauds)
 252                 return new_rate;
 253
 254         /*
 255          * The general purpose firmware for the Cypress M8 allows for
 256          * a maximum speed of 57600bps (I have no idea whether DeLorme
 257          * chose to use the general purpose firmware or not), if you
 258          * need to modify this speed setting for your own project
 259          * please add your own chiptype and modify the code likewise.
 260          * The Cypress HID->COM device will work successfully up to
 261          * 115200bps (but the actual throughput is around 3kBps).
 262          */
 263         if (port->serial->dev->speed == USB_SPEED_LOW) {
 264                 /*
 265                  * Mike Isely <isely@pobox.com> 2-Feb-2008: The
 266                  * Cypress app note that describes this mechanism
 267                  * states the the low-speed part can't handle more
 268                  * than 800 bytes/sec, in which case 4800 baud is the
 269                  * safest speed for a part like that.
 270                  */
 271                 if (new_rate > 4800) {
 272                         dbg("%s - failed setting baud rate, device incapable "
 273                             "speed %d", __func__, new_rate);
 274                         return -1;
 275                 }
 276         }
 277         switch (priv->chiptype) {
 278         case CT_EARTHMATE:
 279                 if (new_rate <= 600) {
 280                         /* 300 and 600 baud rates are supported under
 281                          * the generic firmware, but are not used with
 282                          * NMEA and SiRF protocols */
 283                         dbg("%s - failed setting baud rate, unsupported speed "
 284                             "of %d on Earthmate GPS", __func__, new_rate);
 285                         return -1;
 286                 }
 287                 break;
 288         default:
 289                 break;
 290         }
 291         return new_rate;
 292 }
 293
 294
 295 /* This function can either set or retrieve the current serial line settings */
 296 static int cypress_serial_control(struct tty_struct *tty,
 297         struct usb_serial_port *port, speed_t baud_rate, int data_bits,
 298         int stop_bits, int parity_enable, int parity_type, int reset,
 299         int cypress_request_type)
 300 {
 301         int new_baudrate = 0, retval = 0, tries = 0;
 302         struct cypress_private *priv;
 303         u8 *feature_buffer;
 304         const unsigned int feature_len = 5;
 305         unsigned long flags;
 306
 307         priv = usb_get_serial_port_data(port);
 308
 309         if (!priv->comm_is_ok)
 310                 return -ENODEV;
 311
 312         feature_buffer = kcalloc(feature_len, sizeof(u8), GFP_KERNEL);
 313         if (!feature_buffer)
 314                 return -ENOMEM;
 315
 316         switch (cypress_request_type) {
 317         case CYPRESS_SET_CONFIG:
 318                 /* 0 means 'Hang up' so doesn't change the true bit rate */
 319                 new_baudrate = priv->baud_rate;
 320                 if (baud_rate && baud_rate != priv->baud_rate) {
 321                         dbg("%s - baud rate is changing", __func__);
 322                         retval = analyze_baud_rate(port, baud_rate);
 323                         if (retval >= 0) {
 324                                 new_baudrate = retval;
 325                                 dbg("%s - New baud rate set to %d",
 326                                     __func__, new_baudrate);
 327                         }
 328                 }
 329                 dbg("%s - baud rate is being sent as %d",
 330                                         __func__, new_baudrate);
 331
 332                 /* fill the feature_buffer with new configuration */
 333                 put_unaligned_le32(new_baudrate, feature_buffer);
 334                 feature_buffer[4] |= data_bits;   /* assign data bits in 2 bit space ( max 3 ) */
 335                 /* 1 bit gap */
 336                 feature_buffer[4] |= (stop_bits << 3);   /* assign stop bits in 1 bit space */
 337                 feature_buffer[4] |= (parity_enable << 4);   /* assign parity flag in 1 bit space */
 338                 feature_buffer[4] |= (parity_type << 5);   /* assign parity type in 1 bit space */
 339                 /* 1 bit gap */
 340                 feature_buffer[4] |= (reset << 7);   /* assign reset at end of byte, 1 bit space */
 341
 342                 dbg("%s - device is being sent this feature report:",
 343                                                                 __func__);
 344                 dbg("%s - %02X - %02X - %02X - %02X - %02X", __func__,
 345                         feature_buffer[0], feature_buffer[1],
 346                         feature_buffer[2], feature_buffer[3],
 347                         feature_buffer[4]);
 348
 349                 do {
 350                         retval = usb_control_msg(port->serial->dev,
 351                                         usb_sndctrlpipe(port->serial->dev, 0),
 352                                         HID_REQ_SET_REPORT,
 353                                         USB_DIR_OUT | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
 354                                         0x0300, 0, feature_buffer,
 355                                         feature_len, 500);
 356
 357                         if (tries++ >= 3)
 358                                 break;
 359
 360                 } while (retval != feature_len &&
 361                          retval != -ENODEV);
 362
 363                 if (retval != feature_len) {
 364                         dev_err(&port->dev, "%s - failed sending serial "
 365                                 "line settings - %d\n", __func__, retval);
 366                         cypress_set_dead(port);
 367                 } else {
 368                         spin_lock_irqsave(&priv->lock, flags);
 369                         priv->baud_rate = new_baudrate;
 370                         priv->current_config = feature_buffer[4];
 371                         spin_unlock_irqrestore(&priv->lock, flags);
 372                         /* If we asked for a speed change encode it */
 373                         if (baud_rate)
 374                                 tty_encode_baud_rate(tty,
 375                                         new_baudrate, new_baudrate);
 376                 }
 377         break;
 378         case CYPRESS_GET_CONFIG:
 379                 if (priv->get_cfg_unsafe) {
 380                         /* Not implemented for this device,
 381                            and if we try to do it we're likely
 382                            to crash the hardware. */
 383                         retval = -ENOTTY;
 384                         goto out;
 385                 }
 386                 dbg("%s - retreiving serial line settings", __func__);
 387                 do {
 388                         retval = usb_control_msg(port->serial->dev,
 389                                         usb_rcvctrlpipe(port->serial->dev, 0),
 390                                         HID_REQ_GET_REPORT,
 391                                         USB_DIR_IN | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
 392                                         0x0300, 0, feature_buffer,
 393                                         feature_len, 500);
 394
 395                         if (tries++ >= 3)
 396                                 break;
 397                 } while (retval != feature_len
 398                                                 && retval != -ENODEV);
 399
 400                 if (retval != feature_len) {
 401                         dev_err(&port->dev, "%s - failed to retrieve serial "
 402                                 "line settings - %d\n", __func__, retval);
 403                         cypress_set_dead(port);
 404                         goto out;
 405                 } else {
 406                         spin_lock_irqsave(&priv->lock, flags);
 407                         /* store the config in one byte, and later
 408                            use bit masks to check values */
 409                         priv->current_config = feature_buffer[4];
 410                         priv->baud_rate = get_unaligned_le32(feature_buffer);
 411                         spin_unlock_irqrestore(&priv->lock, flags);
 412                 }
 413         }
 414         spin_lock_irqsave(&priv->lock, flags);
 415         ++priv->cmd_count;
 416         spin_unlock_irqrestore(&priv->lock, flags);
 417 out:
 418         kfree(feature_buffer);
 419         return retval;
 420 } /* cypress_serial_control */
 421
 422
 423 static void cypress_set_dead(struct usb_serial_port *port)
 424 {
 425         struct cypress_private *priv = usb_get_serial_port_data(port);
 426         unsigned long flags;
 427
 428         spin_lock_irqsave(&priv->lock, flags);
 429         if (!priv->comm_is_ok) {
 430                 spin_unlock_irqrestore(&priv->lock, flags);
 431                 return;
 432         }
 433         priv->comm_is_ok = 0;
 434         spin_unlock_irqrestore(&priv->lock, flags);
 435
 436         dev_err(&port->dev, "cypress_m8 suspending failing port %d - "
 437                 "interval might be too short\n", port->number);
 438 }
 439
 440
 441 /*****************************************************************************
 442  * Cypress serial driver functions
 443  *****************************************************************************/
 444
 445
 446 static int generic_startup(struct usb_serial *serial)
 447 {
 448         struct cypress_private *priv;
 449         struct usb_serial_port *port = serial->port[0];
 450
 451         priv = kzalloc(sizeof(struct cypress_private), GFP_KERNEL);
 452         if (!priv)
 453                 return -ENOMEM;
 454
 455         priv->comm_is_ok = !0;
 456         spin_lock_init(&priv->lock);
 457         if (kfifo_alloc(&priv->write_fifo, CYPRESS_BUF_SIZE, GFP_KERNEL)) {
 458                 kfree(priv);
 459                 return -ENOMEM;
 460         }
 461         init_waitqueue_head(&priv->delta_msr_wait);
 462
 463         usb_reset_configuration(serial->dev);
 464
 465         priv->cmd_ctrl = 0;
 466         priv->line_control = 0;
 467         priv->termios_initialized = 0;
 468         priv->rx_flags = 0;
 469         /* Default packet format setting is determined by packet size.
 470            Anything with a size larger then 9 must have a separate
 471            count field since the 3 bit count field is otherwise too
 472            small.  Otherwise we can use the slightly more compact
 473            format.  This is in accordance with the cypress_m8 serial
 474            converter app note. */
 475         if (port->interrupt_out_size > 9)
 476                 priv->pkt_fmt = packet_format_1;
 477         else
 478                 priv->pkt_fmt = packet_format_2;
 479
 480         if (interval > 0) {
 481                 priv->write_urb_interval = interval;
 482                 priv->read_urb_interval = interval;
 483                 dbg("%s - port %d read & write intervals forced to %d",
 484                     __func__, port->number, interval);
 485         } else {
 486                 priv->write_urb_interval = port->interrupt_out_urb->interval;
 487                 priv->read_urb_interval = port->interrupt_in_urb->interval;
 488                 dbg("%s - port %d intervals: read=%d write=%d",
 489                     __func__, port->number,
 490                     priv->read_urb_interval, priv->write_urb_interval);
 491         }
 492         usb_set_serial_port_data(port, priv);
 493
 494         return 0;
 495 }
 496
 497
 498 static int cypress_earthmate_startup(struct usb_serial *serial)
 499 {
 500         struct cypress_private *priv;
 501         struct usb_serial_port *port = serial->port[0];
 502
 503         if (generic_startup(serial)) {
 504                 dbg("%s - Failed setting up port %d", __func__,
 505                                 port->number);
 506                 return 1;
 507         }
 508
 509         priv = usb_get_serial_port_data(port);
 510         priv->chiptype = CT_EARTHMATE;
 511         /* All Earthmate devices use the separated-count packet
 512            format!  Idiotic. */
 513         priv->pkt_fmt = packet_format_1;
 514         if (serial->dev->descriptor.idProduct !=
 515                                 cpu_to_le16(PRODUCT_ID_EARTHMATEUSB)) {
 516                 /* The old original USB Earthmate seemed able to
 517                    handle GET_CONFIG requests; everything they've
 518                    produced since that time crashes if this command is
 519                    attempted :-( */
 520                 dbg("%s - Marking this device as unsafe for GET_CONFIG "
 521                     "commands", __func__);
 522                 priv->get_cfg_unsafe = !0;
 523         }
 524
 525         return 0;
 526 } /* cypress_earthmate_startup */
 527
 528
 529 static int cypress_hidcom_startup(struct usb_serial *serial)
 530 {
 531         struct cypress_private *priv;
 532
 533         if (generic_startup(serial)) {
 534                 dbg("%s - Failed setting up port %d", __func__,
 535                                 serial->port[0]->number);
 536                 return 1;
 537         }
 538
 539         priv = usb_get_serial_port_data(serial->port[0]);
 540         priv->chiptype = CT_CYPHIDCOM;
 541
 542         return 0;
 543 } /* cypress_hidcom_startup */
 544
 545
 546 static int cypress_ca42v2_startup(struct usb_serial *serial)
 547 {
 548         struct cypress_private *priv;
 549
 550         if (generic_startup(serial)) {
 551                 dbg("%s - Failed setting up port %d", __func__,
 552                                 serial->port[0]->number);
 553                 return 1;
 554         }
 555
 556         priv = usb_get_serial_port_data(serial->port[0]);
 557         priv->chiptype = CT_CA42V2;
 558
 559         return 0;
 560 } /* cypress_ca42v2_startup */
 561
 562
 563 static void cypress_release(struct usb_serial *serial)
 564 {
 565         struct cypress_private *priv;
 566
 567         /* all open ports are closed at this point */
 568         priv = usb_get_serial_port_data(serial->port[0]);
 569
 570         if (priv) {
 571                 kfifo_free(&priv->write_fifo);
 572                 kfree(priv);
 573         }
 574 }
 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, &priv->tmp_termios);
 604
 605         /* setup the port and start reading from the device */
 606         if (!port->interrupt_in_urb) {
 607                 dev_err(&port->dev, "%s - interrupt_in_urb is empty!\n",
 608                         __func__);
 609                 return -1;
 610         }
 611
 612         usb_fill_int_urb(port->interrupt_in_urb, serial->dev,
 613                 usb_rcvintpipe(serial->dev, port->interrupt_in_endpointAddress),
 614                 port->interrupt_in_urb->transfer_buffer,
 615                 port->interrupt_in_urb->transfer_buffer_length,
 616                 cypress_read_int_callback, port, priv->read_urb_interval);
 617         result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
 618
 619         if (result) {
 620                 dev_err(&port->dev,
 621                         "%s - failed submitting read urb, error %d\n",
 622                                                         __func__, result);
 623                 cypress_set_dead(port);
 624         }
 625         port->port.drain_delay = 256;
 626         return result;
 627 } /* cypress_open */
 628
 629 static void cypress_dtr_rts(struct usb_serial_port *port, int on)
 630 {
 631         struct cypress_private *priv = usb_get_serial_port_data(port);
 632         /* drop dtr and rts */
 633         spin_lock_irq(&priv->lock);
 634         if (on == 0)
 635                 priv->line_control = 0;
 636         else
 637                 priv->line_control = CONTROL_DTR | CONTROL_RTS;
 638         priv->cmd_ctrl = 1;
 639         spin_unlock_irq(&priv->lock);
 640         cypress_write(NULL, port, NULL, 0);
 641 }
 642
 643 static void cypress_close(struct usb_serial_port *port)
 644 {
 645         struct cypress_private *priv = usb_get_serial_port_data(port);
 646         unsigned long flags;
 647
 648         /* writing is potentially harmful, lock must be taken */
 649         mutex_lock(&port->serial->disc_mutex);
 650         if (port->serial->disconnected) {
 651                 mutex_unlock(&port->serial->disc_mutex);
 652                 return;
 653         }
 654         spin_lock_irqsave(&priv->lock, flags);
 655         kfifo_reset_out(&priv->write_fifo);
 656         spin_unlock_irqrestore(&priv->lock, flags);
 657
 658         dbg("%s - stopping urbs", __func__);
 659         usb_kill_urb(port->interrupt_in_urb);
 660         usb_kill_urb(port->interrupt_out_urb);
 661
 662         if (stats)
 663                 dev_info(&port->dev, "Statistics: %d Bytes In | %d Bytes Out | %d Commands Issued\n",
 664                         priv->bytes_in, priv->bytes_out, priv->cmd_count);
 665         mutex_unlock(&port->serial->disc_mutex);
 666 } /* cypress_close */
 667
 668
 669 static int cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
 670                                         const unsigned char *buf, int count)
 671 {
 672         struct cypress_private *priv = usb_get_serial_port_data(port);
 673
 674         dbg("%s - port %d, %d bytes", __func__, port->number, count);
 675
 676         /* line control commands, which need to be executed immediately,
 677            are not put into the buffer for obvious reasons.
 678          */
 679         if (priv->cmd_ctrl) {
 680                 count = 0;
 681                 goto finish;
 682         }
 683
 684         if (!count)
 685                 return count;
 686
 687         count = kfifo_in_locked(&priv->write_fifo, buf, count, &priv->lock);
 688
 689 finish:
 690         cypress_send(port);
 691
 692         return count;
 693 } /* cypress_write */
 694
 695
 696 static void cypress_send(struct usb_serial_port *port)
 697 {
 698         int count = 0, result, offset, actual_size;
 699         struct cypress_private *priv = usb_get_serial_port_data(port);
 700         unsigned long flags;
 701
 702         if (!priv->comm_is_ok)
 703                 return;
 704
 705         dbg("%s - interrupt out size is %d", __func__,
 706                                                 port->interrupt_out_size);
 707
 708         spin_lock_irqsave(&priv->lock, flags);
 709         if (priv->write_urb_in_use) {
 710                 dbg("%s - can't write, urb in use", __func__);
 711                 spin_unlock_irqrestore(&priv->lock, flags);
 712                 return;
 713         }
 714         spin_unlock_irqrestore(&priv->lock, flags);
 715
 716         /* clear buffer */
 717         memset(port->interrupt_out_urb->transfer_buffer, 0,
 718                                                 port->interrupt_out_size);
 719
 720         spin_lock_irqsave(&priv->lock, flags);
 721         switch (priv->pkt_fmt) {
 722         default:
 723         case packet_format_1:
 724                 /* this is for the CY7C64013... */
 725                 offset = 2;
 726                 port->interrupt_out_buffer[0] = priv->line_control;
 727                 break;
 728         case packet_format_2:
 729                 /* this is for the CY7C63743... */
 730                 offset = 1;
 731                 port->interrupt_out_buffer[0] = priv->line_control;
 732                 break;
 733         }
 734
 735         if (priv->line_control & CONTROL_RESET)
 736                 priv->line_control &= ~CONTROL_RESET;
 737
 738         if (priv->cmd_ctrl) {
 739                 priv->cmd_count++;
 740                 dbg("%s - line control command being issued", __func__);
 741                 spin_unlock_irqrestore(&priv->lock, flags);
 742                 goto send;
 743         } else
 744                 spin_unlock_irqrestore(&priv->lock, flags);
 745
 746         count = kfifo_out_locked(&priv->write_fifo,
 747                                         &port->interrupt_out_buffer[offset],
 748                                         port->interrupt_out_size - offset,
 749                                         &priv->lock);
 750         if (count == 0)
 751                 return;
 752
 753         switch (priv->pkt_fmt) {
 754         default:
 755         case packet_format_1:
 756                 port->interrupt_out_buffer[1] = count;
 757                 break;
 758         case packet_format_2:
 759                 port->interrupt_out_buffer[0] |= count;
 760         }
 761
 762         dbg("%s - count is %d", __func__, count);
 763
 764 send:
 765         spin_lock_irqsave(&priv->lock, flags);
 766         priv->write_urb_in_use = 1;
 767         spin_unlock_irqrestore(&priv->lock, flags);
 768
 769         if (priv->cmd_ctrl)
 770                 actual_size = 1;
 771         else
 772                 actual_size = count +
 773                               (priv->pkt_fmt == packet_format_1 ? 2 : 1);
 774
 775         usb_serial_debug_data(debug, &port->dev, __func__,
 776                 port->interrupt_out_size,
 777                 port->interrupt_out_urb->transfer_buffer);
 778
 779         usb_fill_int_urb(port->interrupt_out_urb, port->serial->dev,
 780                 usb_sndintpipe(port->serial->dev, port->interrupt_out_endpointAddress),
 781                 port->interrupt_out_buffer, port->interrupt_out_size,
 782                 cypress_write_int_callback, port, priv->write_urb_interval);
 783         result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC);
 784         if (result) {
 785                 dev_err_console(port,
 786                                 "%s - failed submitting write urb, error %d\n",
 787                                                         __func__, result);
 788                 priv->write_urb_in_use = 0;
 789                 cypress_set_dead(port);
 790         }
 791
 792         spin_lock_irqsave(&priv->lock, flags);
 793         if (priv->cmd_ctrl)
 794                 priv->cmd_ctrl = 0;
 795
 796         /* do not count the line control and size bytes */
 797         priv->bytes_out += count;
 798         spin_unlock_irqrestore(&priv->lock, flags);
 799
 800         usb_serial_port_softint(port);
 801 } /* cypress_send */
 802
 803
 804 /* returns how much space is available in the soft buffer */
 805 static int cypress_write_room(struct tty_struct *tty)
 806 {
 807         struct usb_serial_port *port = tty->driver_data;
 808         struct cypress_private *priv = usb_get_serial_port_data(port);
 809         int room = 0;
 810         unsigned long flags;
 811
 812         spin_lock_irqsave(&priv->lock, flags);
 813         room = kfifo_avail(&priv->write_fifo);
 814         spin_unlock_irqrestore(&priv->lock, flags);
 815
 816         dbg("%s - returns %d", __func__, room);
 817         return room;
 818 }
 819
 820
 821 static int cypress_tiocmget(struct tty_struct *tty)
 822 {
 823         struct usb_serial_port *port = tty->driver_data;
 824         struct cypress_private *priv = usb_get_serial_port_data(port);
 825         __u8 status, control;
 826         unsigned int result = 0;
 827         unsigned long flags;
 828
 829         spin_lock_irqsave(&priv->lock, flags);
 830         control = priv->line_control;
 831         status = priv->current_status;
 832         spin_unlock_irqrestore(&priv->lock, flags);
 833
 834         result = ((control & CONTROL_DTR)        ? TIOCM_DTR : 0)
 835                 | ((control & CONTROL_RTS)       ? TIOCM_RTS : 0)
 836                 | ((status & UART_CTS)        ? TIOCM_CTS : 0)
 837                 | ((status & UART_DSR)        ? TIOCM_DSR : 0)
 838                 | ((status & UART_RI)         ? TIOCM_RI  : 0)
 839                 | ((status & UART_CD)         ? TIOCM_CD  : 0);
 840
 841         dbg("%s - result = %x", __func__, result);
 842
 843         return result;
 844 }
 845
 846
 847 static int cypress_tiocmset(struct tty_struct *tty,
 848                                unsigned int set, unsigned int clear)
 849 {
 850         struct usb_serial_port *port = tty->driver_data;
 851         struct cypress_private *priv = usb_get_serial_port_data(port);
 852         unsigned long flags;
 853
 854         spin_lock_irqsave(&priv->lock, flags);
 855         if (set & TIOCM_RTS)
 856                 priv->line_control |= CONTROL_RTS;
 857         if (set & TIOCM_DTR)
 858                 priv->line_control |= CONTROL_DTR;
 859         if (clear & TIOCM_RTS)
 860                 priv->line_control &= ~CONTROL_RTS;
 861         if (clear & TIOCM_DTR)
 862                 priv->line_control &= ~CONTROL_DTR;
 863         priv->cmd_ctrl = 1;
 864         spin_unlock_irqrestore(&priv->lock, flags);
 865
 866         return cypress_write(tty, port, NULL, 0);
 867 }
 868
 869
 870 static int cypress_ioctl(struct tty_struct *tty,
 871                                         unsigned int cmd, unsigned long arg)
 872 {
 873         struct usb_serial_port *port = tty->driver_data;
 874         struct cypress_private *priv = usb_get_serial_port_data(port);
 875
 876         dbg("%s - port %d, cmd 0x%.4x", __func__, port->number, cmd);
 877
 878         switch (cmd) {
 879         /* This code comes from drivers/char/serial.c and ftdi_sio.c */
 880         case TIOCMIWAIT:
 881                 while (priv != NULL) {
 882                         interruptible_sleep_on(&priv->delta_msr_wait);
 883                         /* see if a signal did it */
 884                         if (signal_pending(current))
 885                                 return -ERESTARTSYS;
 886                         else {
 887                                 char diff = priv->diff_status;
 888                                 if (diff == 0)
 889                                         return -EIO; /* no change => error */
 890
 891                                 /* consume all events */
 892                                 priv->diff_status = 0;
 893
 894                                 /* return 0 if caller wanted to know about
 895                                    these bits */
 896                                 if (((arg & TIOCM_RNG) && (diff & UART_RI)) ||
 897                                     ((arg & TIOCM_DSR) && (diff & UART_DSR)) ||
 898                                     ((arg & TIOCM_CD) && (diff & UART_CD)) ||
 899                                     ((arg & TIOCM_CTS) && (diff & UART_CTS)))
 900                                         return 0;
 901                                 /* otherwise caller can't care less about what
 902                                  * happened, and so we continue to wait for
 903                                  * more events.
 904                                  */
 905                         }
 906                 }
 907                 return 0;
 908         default:
 909                 break;
 910         }
 911         dbg("%s - arg not supported - it was 0x%04x - check include/asm/ioctls.h", __func__, cmd);
 912         return -ENOIOCTLCMD;
 913 } /* cypress_ioctl */
 914
 915
 916 static void cypress_set_termios(struct tty_struct *tty,
 917         struct usb_serial_port *port, struct ktermios *old_termios)
 918 {
 919         struct cypress_private *priv = usb_get_serial_port_data(port);
 920         int data_bits, stop_bits, parity_type, parity_enable;
 921         unsigned cflag, iflag;
 922         unsigned long flags;
 923         __u8 oldlines;
 924         int linechange = 0;
 925
 926         spin_lock_irqsave(&priv->lock, flags);
 927         /* We can't clean this one up as we don't know the device type
 928            early enough */
 929         if (!priv->termios_initialized) {
 930                 if (priv->chiptype == CT_EARTHMATE) {
 931                         *(tty->termios) = tty_std_termios;
 932                         tty->termios->c_cflag = B4800 | CS8 | CREAD | HUPCL |
 933                                 CLOCAL;
 934                         tty->termios->c_ispeed = 4800;
 935                         tty->termios->c_ospeed = 4800;
 936                 } else if (priv->chiptype == CT_CYPHIDCOM) {
 937                         *(tty->termios) = tty_std_termios;
 938                         tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL |
 939                                 CLOCAL;
 940                         tty->termios->c_ispeed = 9600;
 941                         tty->termios->c_ospeed = 9600;
 942                 } else if (priv->chiptype == CT_CA42V2) {
 943                         *(tty->termios) = tty_std_termios;
 944                         tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL |
 945                                 CLOCAL;
 946                         tty->termios->c_ispeed = 9600;
 947                         tty->termios->c_ospeed = 9600;
 948                 }
 949                 priv->termios_initialized = 1;
 950         }
 951         spin_unlock_irqrestore(&priv->lock, flags);
 952
 953         /* Unsupported features need clearing */
 954         tty->termios->c_cflag &= ~(CMSPAR|CRTSCTS);
 955
 956         cflag = tty->termios->c_cflag;
 957         iflag = tty->termios->c_iflag;
 958
 959         /* check if there are new settings */
 960         if (old_termios) {
 961                 spin_lock_irqsave(&priv->lock, flags);
 962                 priv->tmp_termios = *(tty->termios);
 963                 spin_unlock_irqrestore(&priv->lock, flags);
 964         }
 965
 966         /* set number of data bits, parity, stop bits */
 967         /* when parity is disabled the parity type bit is ignored */
 968
 969         /* 1 means 2 stop bits, 0 means 1 stop bit */
 970         stop_bits = cflag & CSTOPB ? 1 : 0;
 971
 972         if (cflag & PARENB) {
 973                 parity_enable = 1;
 974                 /* 1 means odd parity, 0 means even parity */
 975                 parity_type = cflag & PARODD ? 1 : 0;
 976         } else
 977                 parity_enable = parity_type = 0;
 978
 979         switch (cflag & CSIZE) {
 980         case CS5:
 981                 data_bits = 0;
 982                 break;
 983         case CS6:
 984                 data_bits = 1;
 985                 break;
 986         case CS7:
 987                 data_bits = 2;
 988                 break;
 989         case CS8:
 990                 data_bits = 3;
 991                 break;
 992         default:
 993                 dev_err(&port->dev, "%s - CSIZE was set, but not CS5-CS8\n",
 994                         __func__);
 995                 data_bits = 3;
 996         }
 997         spin_lock_irqsave(&priv->lock, flags);
 998         oldlines = priv->line_control;
 999         if ((cflag & CBAUD) == B0) {
1000                 /* drop dtr and rts */
1001                 dbg("%s - dropping the lines, baud rate 0bps", __func__);
1002                 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
1003         } else
1004                 priv->line_control = (CONTROL_DTR | CONTROL_RTS);
1005         spin_unlock_irqrestore(&priv->lock, flags);
1006
1007         dbg("%s - sending %d stop_bits, %d parity_enable, %d parity_type, "
1008                         "%d data_bits (+5)", __func__, stop_bits,
1009                         parity_enable, parity_type, data_bits);
1010
1011         cypress_serial_control(tty, port, tty_get_baud_rate(tty),
1012                         data_bits, stop_bits,
1013                         parity_enable, parity_type,
1014                         0, CYPRESS_SET_CONFIG);
1015
1016         /* we perform a CYPRESS_GET_CONFIG so that the current settings are
1017          * filled into the private structure this should confirm that all is
1018          * working if it returns what we just set */
1019         cypress_serial_control(tty, port, 0, 0, 0, 0, 0, 0, CYPRESS_GET_CONFIG);
1020
1021         /* Here we can define custom tty settings for devices; the main tty
1022          * termios flag base comes from empeg.c */
1023
1024         spin_lock_irqsave(&priv->lock, flags);
1025         if (priv->chiptype == CT_EARTHMATE && priv->baud_rate == 4800) {
1026                 dbg("Using custom termios settings for a baud rate of "
1027                                 "4800bps.");
1028                 /* define custom termios settings for NMEA protocol */
1029
1030                 tty->termios->c_iflag /* input modes - */
1031                         &= ~(IGNBRK  /* disable ignore break */
1032                         | BRKINT     /* disable break causes interrupt */
1033                         | PARMRK     /* disable mark parity errors */
1034                         | ISTRIP     /* disable clear high bit of input char */
1035                         | INLCR      /* disable translate NL to CR */
1036                         | IGNCR      /* disable ignore CR */
1037                         | ICRNL      /* disable translate CR to NL */
1038                         | IXON);     /* disable enable XON/XOFF flow control */
1039
1040                 tty->termios->c_oflag /* output modes */
1041                         &= ~OPOST;    /* disable postprocess output char */
1042
1043                 tty->termios->c_lflag /* line discipline modes */
1044                         &= ~(ECHO     /* disable echo input characters */
1045                         | ECHONL      /* disable echo new line */
1046                         | ICANON      /* disable erase, kill, werase, and rprnt
1047                                          special characters */
1048                         | ISIG        /* disable interrupt, quit, and suspend
1049                                          special characters */
1050                         | IEXTEN);    /* disable non-POSIX special characters */
1051         } /* CT_CYPHIDCOM: Application should handle this for device */
1052
1053         linechange = (priv->line_control != oldlines);
1054         spin_unlock_irqrestore(&priv->lock, flags);
1055
1056         /* if necessary, set lines */
1057         if (linechange) {
1058                 priv->cmd_ctrl = 1;
1059                 cypress_write(tty, port, NULL, 0);
1060         }
1061 } /* cypress_set_termios */
1062
1063
1064 /* returns amount of data still left in soft buffer */
1065 static int cypress_chars_in_buffer(struct tty_struct *tty)
1066 {
1067         struct usb_serial_port *port = tty->driver_data;
1068         struct cypress_private *priv = usb_get_serial_port_data(port);
1069         int chars = 0;
1070         unsigned long flags;
1071
1072         spin_lock_irqsave(&priv->lock, flags);
1073         chars = kfifo_len(&priv->write_fifo);
1074         spin_unlock_irqrestore(&priv->lock, flags);
1075
1076         dbg("%s - returns %d", __func__, chars);
1077         return chars;
1078 }
1079
1080
1081 static void cypress_throttle(struct tty_struct *tty)
1082 {
1083         struct usb_serial_port *port = tty->driver_data;
1084         struct cypress_private *priv = usb_get_serial_port_data(port);
1085
1086         spin_lock_irq(&priv->lock);
1087         priv->rx_flags = THROTTLED;
1088         spin_unlock_irq(&priv->lock);
1089 }
1090
1091
1092 static void cypress_unthrottle(struct tty_struct *tty)
1093 {
1094         struct usb_serial_port *port = tty->driver_data;
1095         struct cypress_private *priv = usb_get_serial_port_data(port);
1096         int actually_throttled, result;
1097
1098         spin_lock_irq(&priv->lock);
1099         actually_throttled = priv->rx_flags & ACTUALLY_THROTTLED;
1100         priv->rx_flags = 0;
1101         spin_unlock_irq(&priv->lock);
1102
1103         if (!priv->comm_is_ok)
1104                 return;
1105
1106         if (actually_throttled) {
1107                 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
1108                 if (result) {
1109                         dev_err(&port->dev, "%s - failed submitting read urb, "
1110                                         "error %d\n", __func__, result);
1111                         cypress_set_dead(port);
1112                 }
1113         }
1114 }
1115
1116
1117 static void cypress_read_int_callback(struct urb *urb)
1118 {
1119         struct usb_serial_port *port = urb->context;
1120         struct cypress_private *priv = usb_get_serial_port_data(port);
1121         struct tty_struct *tty;
1122         unsigned char *data = urb->transfer_buffer;
1123         unsigned long flags;
1124         char tty_flag = TTY_NORMAL;
1125         int havedata = 0;
1126         int bytes = 0;
1127         int result;
1128         int i = 0;
1129         int status = urb->status;
1130
1131         switch (status) {
1132         case 0: /* success */
1133                 break;
1134         case -ECONNRESET:
1135         case -ENOENT:
1136         case -ESHUTDOWN:
1137                 /* precursor to disconnect so just go away */
1138                 return;
1139         case -EPIPE:
1140                 /* Can't call usb_clear_halt while in_interrupt */
1141                 /* FALLS THROUGH */
1142         default:
1143                 /* something ugly is going on... */
1144                 dev_err(&urb->dev->dev,
1145                         "%s - unexpected nonzero read status received: %d\n",
1146                                                         __func__, status);
1147                 cypress_set_dead(port);
1148                 return;
1149         }
1150
1151         spin_lock_irqsave(&priv->lock, flags);
1152         if (priv->rx_flags & THROTTLED) {
1153                 dbg("%s - now throttling", __func__);
1154                 priv->rx_flags |= ACTUALLY_THROTTLED;
1155                 spin_unlock_irqrestore(&priv->lock, flags);
1156                 return;
1157         }
1158         spin_unlock_irqrestore(&priv->lock, flags);
1159
1160         tty = tty_port_tty_get(&port->port);
1161         if (!tty) {
1162                 dbg("%s - bad tty pointer - exiting", __func__);
1163                 return;
1164         }
1165
1166         spin_lock_irqsave(&priv->lock, flags);
1167         result = urb->actual_length;
1168         switch (priv->pkt_fmt) {
1169         default:
1170         case packet_format_1:
1171                 /* This is for the CY7C64013... */
1172                 priv->current_status = data[0] & 0xF8;
1173                 bytes = data[1] + 2;
1174                 i = 2;
1175                 if (bytes > 2)
1176                         havedata = 1;
1177                 break;
1178         case packet_format_2:
1179                 /* This is for the CY7C63743... */
1180                 priv->current_status = data[0] & 0xF8;
1181                 bytes = (data[0] & 0x07) + 1;
1182                 i = 1;
1183                 if (bytes > 1)
1184                         havedata = 1;
1185                 break;
1186         }
1187         spin_unlock_irqrestore(&priv->lock, flags);
1188         if (result < bytes) {
1189                 dbg("%s - wrong packet size - received %d bytes but packet "
1190                     "said %d bytes", __func__, result, bytes);
1191                 goto continue_read;
1192         }
1193
1194         usb_serial_debug_data(debug, &port->dev, __func__,
1195                                                 urb->actual_length, data);
1196
1197         spin_lock_irqsave(&priv->lock, flags);
1198         /* check to see if status has changed */
1199         if (priv->current_status != priv->prev_status) {
1200                 priv->diff_status |= priv->current_status ^
1201                         priv->prev_status;
1202                 wake_up_interruptible(&priv->delta_msr_wait);
1203                 priv->prev_status = priv->current_status;
1204         }
1205         spin_unlock_irqrestore(&priv->lock, flags);
1206
1207         /* hangup, as defined in acm.c... this might be a bad place for it
1208          * though */
1209         if (tty && !(tty->termios->c_cflag & CLOCAL) &&
1210                         !(priv->current_status & UART_CD)) {
1211                 dbg("%s - calling hangup", __func__);
1212                 tty_hangup(tty);
1213                 goto continue_read;
1214         }
1215
1216         /* There is one error bit... I'm assuming it is a parity error
1217          * indicator as the generic firmware will set this bit to 1 if a
1218          * parity error occurs.
1219          * I can not find reference to any other error events. */
1220         spin_lock_irqsave(&priv->lock, flags);
1221         if (priv->current_status & CYP_ERROR) {
1222                 spin_unlock_irqrestore(&priv->lock, flags);
1223                 tty_flag = TTY_PARITY;
1224                 dbg("%s - Parity Error detected", __func__);
1225         } else
1226                 spin_unlock_irqrestore(&priv->lock, flags);
1227
1228         /* process read if there is data other than line status */
1229         if (tty && bytes > i) {
1230                 tty_insert_flip_string_fixed_flag(tty, data + i,
1231                                 tty_flag, bytes - i);
1232                 tty_flip_buffer_push(tty);
1233         }
1234
1235         spin_lock_irqsave(&priv->lock, flags);
1236         /* control and status byte(s) are also counted */
1237         priv->bytes_in += bytes;
1238         spin_unlock_irqrestore(&priv->lock, flags);
1239
1240 continue_read:
1241         tty_kref_put(tty);
1242
1243         /* Continue trying to always read */
1244
1245         if (priv->comm_is_ok) {
1246                 usb_fill_int_urb(port->interrupt_in_urb, port->serial->dev,
1247                                 usb_rcvintpipe(port->serial->dev,
1248                                         port->interrupt_in_endpointAddress),
1249                                 port->interrupt_in_urb->transfer_buffer,
1250                                 port->interrupt_in_urb->transfer_buffer_length,
1251                                 cypress_read_int_callback, port,
1252                                 priv->read_urb_interval);
1253                 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
1254                 if (result && result != -EPERM) {
1255                         dev_err(&urb->dev->dev, "%s - failed resubmitting "
1256                                         "read urb, error %d\n", __func__,
1257                                         result);
1258                         cypress_set_dead(port);
1259                 }
1260         }
1261 } /* cypress_read_int_callback */
1262
1263
1264 static void cypress_write_int_callback(struct urb *urb)
1265 {
1266         struct usb_serial_port *port = urb->context;
1267         struct cypress_private *priv = usb_get_serial_port_data(port);
1268         int result;
1269         int status = urb->status;
1270
1271         switch (status) {
1272         case 0:
1273                 /* success */
1274                 break;
1275         case -ECONNRESET:
1276         case -ENOENT:
1277         case -ESHUTDOWN:
1278                 /* this urb is terminated, clean up */
1279                 dbg("%s - urb shutting down with status: %d",
1280                                                 __func__, status);
1281                 priv->write_urb_in_use = 0;
1282                 return;
1283         case -EPIPE: /* no break needed; clear halt and resubmit */
1284                 if (!priv->comm_is_ok)
1285                         break;
1286                 usb_clear_halt(port->serial->dev, 0x02);
1287                 /* error in the urb, so we have to resubmit it */
1288                 dbg("%s - nonzero write bulk status received: %d",
1289                         __func__, status);
1290                 port->interrupt_out_urb->transfer_buffer_length = 1;
1291                 result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC);
1292                 if (!result)
1293                         return;
1294                 dev_err(&urb->dev->dev,
1295                         "%s - failed resubmitting write urb, error %d\n",
1296                                                         __func__, result);
1297                 cypress_set_dead(port);
1298                 break;
1299         default:
1300                 dev_err(&urb->dev->dev,
1301                          "%s - unexpected nonzero write status received: %d\n",
1302                                                         __func__, status);
1303                 cypress_set_dead(port);
1304                 break;
1305         }
1306         priv->write_urb_in_use = 0;
1307
1308         /* send any buffered data */
1309         cypress_send(port);
1310 }
1311
1312 module_usb_serial_driver(cypress_driver, serial_drivers);
1313
1314 MODULE_AUTHOR(DRIVER_AUTHOR);
1315 MODULE_DESCRIPTION(DRIVER_DESC);
1316 MODULE_VERSION(DRIVER_VERSION);
1317 MODULE_LICENSE("GPL");
1318
1319 module_param(debug, bool, S_IRUGO | S_IWUSR);
1320 MODULE_PARM_DESC(debug, "Debug enabled or not");
1321 module_param(stats, bool, S_IRUGO | S_IWUSR);
1322 MODULE_PARM_DESC(stats, "Enable statistics or not");
1323 module_param(interval, int, S_IRUGO | S_IWUSR);
1324 MODULE_PARM_DESC(interval, "Overrides interrupt interval");
1325 module_param(unstable_bauds, bool, S_IRUGO | S_IWUSR);
1326 MODULE_PARM_DESC(unstable_bauds, "Allow unstable baud rates");