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         .id_table =     id_table_combined,
  95 };
  96
  97 enum packet_format {
  98         packet_format_1,  /* b0:status, b1:payload count */
  99         packet_format_2   /* b0[7:3]:status, b0[2:0]:payload count */
 100 };
 101
 102 struct cypress_private {
 103         spinlock_t lock;                   /* private lock */
 104         int chiptype;                      /* identifier of device, for quirks/etc */
 105         int bytes_in;                      /* used for statistics */
 106         int bytes_out;                     /* used for statistics */
 107         int cmd_count;                     /* used for statistics */
 108         int cmd_ctrl;                      /* always set this to 1 before issuing a command */
 109         struct kfifo write_fifo;           /* write fifo */
 110         int write_urb_in_use;              /* write urb in use indicator */
 111         int write_urb_interval;            /* interval to use for write urb */
 112         int read_urb_interval;             /* interval to use for read urb */
 113         int comm_is_ok;                    /* true if communication is (still) ok */
 114         int termios_initialized;
 115         __u8 line_control;                 /* holds dtr / rts value */
 116         __u8 current_status;               /* received from last read - info on dsr,cts,cd,ri,etc */
 117         __u8 current_config;               /* stores the current configuration byte */
 118         __u8 rx_flags;                     /* throttling - used from whiteheat/ftdi_sio */
 119         enum packet_format pkt_fmt;        /* format to use for packet send / receive */
 120         int get_cfg_unsafe;                /* If true, the CYPRESS_GET_CONFIG is unsafe */
 121         int baud_rate;                     /* stores current baud rate in
 122                                               integer form */
 123         int isthrottled;                   /* if throttled, discard reads */
 124         wait_queue_head_t delta_msr_wait;  /* used for TIOCMIWAIT */
 125         char prev_status, diff_status;     /* used for TIOCMIWAIT */
 126         /* we pass a pointer to this as the argument sent to
 127            cypress_set_termios old_termios */
 128         struct ktermios tmp_termios;       /* stores the old termios settings */
 129 };
 130
 131 /* function prototypes for the Cypress USB to serial device */
 132 static int  cypress_earthmate_startup(struct usb_serial *serial);
 133 static int  cypress_hidcom_startup(struct usb_serial *serial);
 134 static int  cypress_ca42v2_startup(struct usb_serial *serial);
 135 static void cypress_release(struct usb_serial *serial);
 136 static int  cypress_open(struct tty_struct *tty, struct usb_serial_port *port);
 137 static void cypress_close(struct usb_serial_port *port);
 138 static void cypress_dtr_rts(struct usb_serial_port *port, int on);
 139 static int  cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
 140                         const unsigned char *buf, int count);
 141 static void cypress_send(struct usb_serial_port *port);
 142 static int  cypress_write_room(struct tty_struct *tty);
 143 static int  cypress_ioctl(struct tty_struct *tty,
 144                         unsigned int cmd, unsigned long arg);
 145 static void cypress_set_termios(struct tty_struct *tty,
 146                         struct usb_serial_port *port, struct ktermios *old);
 147 static int  cypress_tiocmget(struct tty_struct *tty);
 148 static int  cypress_tiocmset(struct tty_struct *tty,
 149                         unsigned int set, unsigned int clear);
 150 static int  cypress_chars_in_buffer(struct tty_struct *tty);
 151 static void cypress_throttle(struct tty_struct *tty);
 152 static void cypress_unthrottle(struct tty_struct *tty);
 153 static void cypress_set_dead(struct usb_serial_port *port);
 154 static void cypress_read_int_callback(struct urb *urb);
 155 static void cypress_write_int_callback(struct urb *urb);
 156
 157 static struct usb_serial_driver cypress_earthmate_device = {
 158         .driver = {
 159                 .owner =                THIS_MODULE,
 160                 .name =                 "earthmate",
 161         },
 162         .description =                  "DeLorme Earthmate USB",
 163         .id_table =                     id_table_earthmate,
 164         .num_ports =                    1,
 165         .attach =                       cypress_earthmate_startup,
 166         .release =                      cypress_release,
 167         .open =                         cypress_open,
 168         .close =                        cypress_close,
 169         .dtr_rts =                      cypress_dtr_rts,
 170         .write =                        cypress_write,
 171         .write_room =                   cypress_write_room,
 172         .ioctl =                        cypress_ioctl,
 173         .set_termios =                  cypress_set_termios,
 174         .tiocmget =                     cypress_tiocmget,
 175         .tiocmset =                     cypress_tiocmset,
 176         .chars_in_buffer =              cypress_chars_in_buffer,
 177         .throttle =                     cypress_throttle,
 178         .unthrottle =                   cypress_unthrottle,
 179         .read_int_callback =            cypress_read_int_callback,
 180         .write_int_callback =           cypress_write_int_callback,
 181 };
 182
 183 static struct usb_serial_driver cypress_hidcom_device = {
 184         .driver = {
 185                 .owner =                THIS_MODULE,
 186                 .name =                 "cyphidcom",
 187         },
 188         .description =                  "HID->COM RS232 Adapter",
 189         .id_table =                     id_table_cyphidcomrs232,
 190         .num_ports =                    1,
 191         .attach =                       cypress_hidcom_startup,
 192         .release =                      cypress_release,
 193         .open =                         cypress_open,
 194         .close =                        cypress_close,
 195         .dtr_rts =                      cypress_dtr_rts,
 196         .write =                        cypress_write,
 197         .write_room =                   cypress_write_room,
 198         .ioctl =                        cypress_ioctl,
 199         .set_termios =                  cypress_set_termios,
 200         .tiocmget =                     cypress_tiocmget,
 201         .tiocmset =                     cypress_tiocmset,
 202         .chars_in_buffer =              cypress_chars_in_buffer,
 203         .throttle =                     cypress_throttle,
 204         .unthrottle =                   cypress_unthrottle,
 205         .read_int_callback =            cypress_read_int_callback,
 206         .write_int_callback =           cypress_write_int_callback,
 207 };
 208
 209 static struct usb_serial_driver cypress_ca42v2_device = {
 210         .driver = {
 211                 .owner =                THIS_MODULE,
 212                 .name =                 "nokiaca42v2",
 213         },
 214         .description =                  "Nokia CA-42 V2 Adapter",
 215         .id_table =                     id_table_nokiaca42v2,
 216         .num_ports =                    1,
 217         .attach =                       cypress_ca42v2_startup,
 218         .release =                      cypress_release,
 219         .open =                         cypress_open,
 220         .close =                        cypress_close,
 221         .dtr_rts =                      cypress_dtr_rts,
 222         .write =                        cypress_write,
 223         .write_room =                   cypress_write_room,
 224         .ioctl =                        cypress_ioctl,
 225         .set_termios =                  cypress_set_termios,
 226         .tiocmget =                     cypress_tiocmget,
 227         .tiocmset =                     cypress_tiocmset,
 228         .chars_in_buffer =              cypress_chars_in_buffer,
 229         .throttle =                     cypress_throttle,
 230         .unthrottle =                   cypress_unthrottle,
 231         .read_int_callback =            cypress_read_int_callback,
 232         .write_int_callback =           cypress_write_int_callback,
 233 };
 234
 235 static struct usb_serial_driver * const serial_drivers[] = {
 236         &cypress_earthmate_device, &cypress_hidcom_device,
 237         &cypress_ca42v2_device, NULL
 238 };
 239
 240 /*****************************************************************************
 241  * Cypress serial helper functions
 242  *****************************************************************************/
 243
 244
 245 static int analyze_baud_rate(struct usb_serial_port *port, speed_t new_rate)
 246 {
 247         struct cypress_private *priv;
 248         priv = usb_get_serial_port_data(port);
 249
 250         if (unstable_bauds)
 251                 return new_rate;
 252
 253         /*
 254          * The general purpose firmware for the Cypress M8 allows for
 255          * a maximum speed of 57600bps (I have no idea whether DeLorme
 256          * chose to use the general purpose firmware or not), if you
 257          * need to modify this speed setting for your own project
 258          * please add your own chiptype and modify the code likewise.
 259          * The Cypress HID->COM device will work successfully up to
 260          * 115200bps (but the actual throughput is around 3kBps).
 261          */
 262         if (port->serial->dev->speed == USB_SPEED_LOW) {
 263                 /*
 264                  * Mike Isely <isely@pobox.com> 2-Feb-2008: The
 265                  * Cypress app note that describes this mechanism
 266                  * states the the low-speed part can't handle more
 267                  * than 800 bytes/sec, in which case 4800 baud is the
 268                  * safest speed for a part like that.
 269                  */
 270                 if (new_rate > 4800) {
 271                         dbg("%s - failed setting baud rate, device incapable "
 272                             "speed %d", __func__, new_rate);
 273                         return -1;
 274                 }
 275         }
 276         switch (priv->chiptype) {
 277         case CT_EARTHMATE:
 278                 if (new_rate <= 600) {
 279                         /* 300 and 600 baud rates are supported under
 280                          * the generic firmware, but are not used with
 281                          * NMEA and SiRF protocols */
 282                         dbg("%s - failed setting baud rate, unsupported speed "
 283                             "of %d on Earthmate GPS", __func__, new_rate);
 284                         return -1;
 285                 }
 286                 break;
 287         default:
 288                 break;
 289         }
 290         return new_rate;
 291 }
 292
 293
 294 /* This function can either set or retrieve the current serial line settings */
 295 static int cypress_serial_control(struct tty_struct *tty,
 296         struct usb_serial_port *port, speed_t baud_rate, int data_bits,
 297         int stop_bits, int parity_enable, int parity_type, int reset,
 298         int cypress_request_type)
 299 {
 300         int new_baudrate = 0, retval = 0, tries = 0;
 301         struct cypress_private *priv;
 302         u8 *feature_buffer;
 303         const unsigned int feature_len = 5;
 304         unsigned long flags;
 305
 306         priv = usb_get_serial_port_data(port);
 307
 308         if (!priv->comm_is_ok)
 309                 return -ENODEV;
 310
 311         feature_buffer = kcalloc(feature_len, sizeof(u8), GFP_KERNEL);
 312         if (!feature_buffer)
 313                 return -ENOMEM;
 314
 315         switch (cypress_request_type) {
 316         case CYPRESS_SET_CONFIG:
 317                 /* 0 means 'Hang up' so doesn't change the true bit rate */
 318                 new_baudrate = priv->baud_rate;
 319                 if (baud_rate && baud_rate != priv->baud_rate) {
 320                         dbg("%s - baud rate is changing", __func__);
 321                         retval = analyze_baud_rate(port, baud_rate);
 322                         if (retval >= 0) {
 323                                 new_baudrate = retval;
 324                                 dbg("%s - New baud rate set to %d",
 325                                     __func__, new_baudrate);
 326                         }
 327                 }
 328                 dbg("%s - baud rate is being sent as %d",
 329                                         __func__, new_baudrate);
 330
 331                 /* fill the feature_buffer with new configuration */
 332                 put_unaligned_le32(new_baudrate, feature_buffer);
 333                 feature_buffer[4] |= data_bits;   /* assign data bits in 2 bit space ( max 3 ) */
 334                 /* 1 bit gap */
 335                 feature_buffer[4] |= (stop_bits << 3);   /* assign stop bits in 1 bit space */
 336                 feature_buffer[4] |= (parity_enable << 4);   /* assign parity flag in 1 bit space */
 337                 feature_buffer[4] |= (parity_type << 5);   /* assign parity type in 1 bit space */
 338                 /* 1 bit gap */
 339                 feature_buffer[4] |= (reset << 7);   /* assign reset at end of byte, 1 bit space */
 340
 341                 dbg("%s - device is being sent this feature report:",
 342                                                                 __func__);
 343                 dbg("%s - %02X - %02X - %02X - %02X - %02X", __func__,
 344                         feature_buffer[0], feature_buffer[1],
 345                         feature_buffer[2], feature_buffer[3],
 346                         feature_buffer[4]);
 347
 348                 do {
 349                         retval = usb_control_msg(port->serial->dev,
 350                                         usb_sndctrlpipe(port->serial->dev, 0),
 351                                         HID_REQ_SET_REPORT,
 352                                         USB_DIR_OUT | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
 353                                         0x0300, 0, feature_buffer,
 354                                         feature_len, 500);
 355
 356                         if (tries++ >= 3)
 357                                 break;
 358
 359                 } while (retval != feature_len &&
 360                          retval != -ENODEV);
 361
 362                 if (retval != feature_len) {
 363                         dev_err(&port->dev, "%s - failed sending serial "
 364                                 "line settings - %d\n", __func__, retval);
 365                         cypress_set_dead(port);
 366                 } else {
 367                         spin_lock_irqsave(&priv->lock, flags);
 368                         priv->baud_rate = new_baudrate;
 369                         priv->current_config = feature_buffer[4];
 370                         spin_unlock_irqrestore(&priv->lock, flags);
 371                         /* If we asked for a speed change encode it */
 372                         if (baud_rate)
 373                                 tty_encode_baud_rate(tty,
 374                                         new_baudrate, new_baudrate);
 375                 }
 376         break;
 377         case CYPRESS_GET_CONFIG:
 378                 if (priv->get_cfg_unsafe) {
 379                         /* Not implemented for this device,
 380                            and if we try to do it we're likely
 381                            to crash the hardware. */
 382                         retval = -ENOTTY;
 383                         goto out;
 384                 }
 385                 dbg("%s - retreiving serial line settings", __func__);
 386                 do {
 387                         retval = usb_control_msg(port->serial->dev,
 388                                         usb_rcvctrlpipe(port->serial->dev, 0),
 389                                         HID_REQ_GET_REPORT,
 390                                         USB_DIR_IN | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
 391                                         0x0300, 0, feature_buffer,
 392                                         feature_len, 500);
 393
 394                         if (tries++ >= 3)
 395                                 break;
 396                 } while (retval != feature_len
 397                                                 && retval != -ENODEV);
 398
 399                 if (retval != feature_len) {
 400                         dev_err(&port->dev, "%s - failed to retrieve serial "
 401                                 "line settings - %d\n", __func__, retval);
 402                         cypress_set_dead(port);
 403                         goto out;
 404                 } else {
 405                         spin_lock_irqsave(&priv->lock, flags);
 406                         /* store the config in one byte, and later
 407                            use bit masks to check values */
 408                         priv->current_config = feature_buffer[4];
 409                         priv->baud_rate = get_unaligned_le32(feature_buffer);
 410                         spin_unlock_irqrestore(&priv->lock, flags);
 411                 }
 412         }
 413         spin_lock_irqsave(&priv->lock, flags);
 414         ++priv->cmd_count;
 415         spin_unlock_irqrestore(&priv->lock, flags);
 416 out:
 417         kfree(feature_buffer);
 418         return retval;
 419 } /* cypress_serial_control */
 420
 421
 422 static void cypress_set_dead(struct usb_serial_port *port)
 423 {
 424         struct cypress_private *priv = usb_get_serial_port_data(port);
 425         unsigned long flags;
 426
 427         spin_lock_irqsave(&priv->lock, flags);
 428         if (!priv->comm_is_ok) {
 429                 spin_unlock_irqrestore(&priv->lock, flags);
 430                 return;
 431         }
 432         priv->comm_is_ok = 0;
 433         spin_unlock_irqrestore(&priv->lock, flags);
 434
 435         dev_err(&port->dev, "cypress_m8 suspending failing port %d - "
 436                 "interval might be too short\n", port->number);
 437 }
 438
 439
 440 /*****************************************************************************
 441  * Cypress serial driver functions
 442  *****************************************************************************/
 443
 444
 445 static int generic_startup(struct usb_serial *serial)
 446 {
 447         struct cypress_private *priv;
 448         struct usb_serial_port *port = serial->port[0];
 449
 450         priv = kzalloc(sizeof(struct cypress_private), GFP_KERNEL);
 451         if (!priv)
 452                 return -ENOMEM;
 453
 454         priv->comm_is_ok = !0;
 455         spin_lock_init(&priv->lock);
 456         if (kfifo_alloc(&priv->write_fifo, CYPRESS_BUF_SIZE, GFP_KERNEL)) {
 457                 kfree(priv);
 458                 return -ENOMEM;
 459         }
 460         init_waitqueue_head(&priv->delta_msr_wait);
 461
 462         usb_reset_configuration(serial->dev);
 463
 464         priv->cmd_ctrl = 0;
 465         priv->line_control = 0;
 466         priv->termios_initialized = 0;
 467         priv->rx_flags = 0;
 468         /* Default packet format setting is determined by packet size.
 469            Anything with a size larger then 9 must have a separate
 470            count field since the 3 bit count field is otherwise too
 471            small.  Otherwise we can use the slightly more compact
 472            format.  This is in accordance with the cypress_m8 serial
 473            converter app note. */
 474         if (port->interrupt_out_size > 9)
 475                 priv->pkt_fmt = packet_format_1;
 476         else
 477                 priv->pkt_fmt = packet_format_2;
 478
 479         if (interval > 0) {
 480                 priv->write_urb_interval = interval;
 481                 priv->read_urb_interval = interval;
 482                 dbg("%s - port %d read & write intervals forced to %d",
 483                     __func__, port->number, interval);
 484         } else {
 485                 priv->write_urb_interval = port->interrupt_out_urb->interval;
 486                 priv->read_urb_interval = port->interrupt_in_urb->interval;
 487                 dbg("%s - port %d intervals: read=%d write=%d",
 488                     __func__, port->number,
 489                     priv->read_urb_interval, priv->write_urb_interval);
 490         }
 491         usb_set_serial_port_data(port, priv);
 492
 493         return 0;
 494 }
 495
 496
 497 static int cypress_earthmate_startup(struct usb_serial *serial)
 498 {
 499         struct cypress_private *priv;
 500         struct usb_serial_port *port = serial->port[0];
 501
 502         if (generic_startup(serial)) {
 503                 dbg("%s - Failed setting up port %d", __func__,
 504                                 port->number);
 505                 return 1;
 506         }
 507
 508         priv = usb_get_serial_port_data(port);
 509         priv->chiptype = CT_EARTHMATE;
 510         /* All Earthmate devices use the separated-count packet
 511            format!  Idiotic. */
 512         priv->pkt_fmt = packet_format_1;
 513         if (serial->dev->descriptor.idProduct !=
 514                                 cpu_to_le16(PRODUCT_ID_EARTHMATEUSB)) {
 515                 /* The old original USB Earthmate seemed able to
 516                    handle GET_CONFIG requests; everything they've
 517                    produced since that time crashes if this command is
 518                    attempted :-( */
 519                 dbg("%s - Marking this device as unsafe for GET_CONFIG "
 520                     "commands", __func__);
 521                 priv->get_cfg_unsafe = !0;
 522         }
 523
 524         return 0;
 525 } /* cypress_earthmate_startup */
 526
 527
 528 static int cypress_hidcom_startup(struct usb_serial *serial)
 529 {
 530         struct cypress_private *priv;
 531
 532         if (generic_startup(serial)) {
 533                 dbg("%s - Failed setting up port %d", __func__,
 534                                 serial->port[0]->number);
 535                 return 1;
 536         }
 537
 538         priv = usb_get_serial_port_data(serial->port[0]);
 539         priv->chiptype = CT_CYPHIDCOM;
 540
 541         return 0;
 542 } /* cypress_hidcom_startup */
 543
 544
 545 static int cypress_ca42v2_startup(struct usb_serial *serial)
 546 {
 547         struct cypress_private *priv;
 548
 549         if (generic_startup(serial)) {
 550                 dbg("%s - Failed setting up port %d", __func__,
 551                                 serial->port[0]->number);
 552                 return 1;
 553         }
 554
 555         priv = usb_get_serial_port_data(serial->port[0]);
 556         priv->chiptype = CT_CA42V2;
 557
 558         return 0;
 559 } /* cypress_ca42v2_startup */
 560
 561
 562 static void cypress_release(struct usb_serial *serial)
 563 {
 564         struct cypress_private *priv;
 565
 566         /* all open ports are closed at this point */
 567         priv = usb_get_serial_port_data(serial->port[0]);
 568
 569         if (priv) {
 570                 kfifo_free(&priv->write_fifo);
 571                 kfree(priv);
 572         }
 573 }
 574
 575
 576 static int cypress_open(struct tty_struct *tty, struct usb_serial_port *port)
 577 {
 578         struct cypress_private *priv = usb_get_serial_port_data(port);
 579         struct usb_serial *serial = port->serial;
 580         unsigned long flags;
 581         int result = 0;
 582
 583         if (!priv->comm_is_ok)
 584                 return -EIO;
 585
 586         /* clear halts before open */
 587         usb_clear_halt(serial->dev, 0x81);
 588         usb_clear_halt(serial->dev, 0x02);
 589
 590         spin_lock_irqsave(&priv->lock, flags);
 591         /* reset read/write statistics */
 592         priv->bytes_in = 0;
 593         priv->bytes_out = 0;
 594         priv->cmd_count = 0;
 595         priv->rx_flags = 0;
 596         spin_unlock_irqrestore(&priv->lock, flags);
 597
 598         /* Set termios */
 599         cypress_send(port);
 600
 601         if (tty)
 602                 cypress_set_termios(tty, port, &priv->tmp_termios);
 603
 604         /* setup the port and start reading from the device */
 605         if (!port->interrupt_in_urb) {
 606                 dev_err(&port->dev, "%s - interrupt_in_urb is empty!\n",
 607                         __func__);
 608                 return -1;
 609         }
 610
 611         usb_fill_int_urb(port->interrupt_in_urb, serial->dev,
 612                 usb_rcvintpipe(serial->dev, port->interrupt_in_endpointAddress),
 613                 port->interrupt_in_urb->transfer_buffer,
 614                 port->interrupt_in_urb->transfer_buffer_length,
 615                 cypress_read_int_callback, port, priv->read_urb_interval);
 616         result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
 617
 618         if (result) {
 619                 dev_err(&port->dev,
 620                         "%s - failed submitting read urb, error %d\n",
 621                                                         __func__, result);
 622                 cypress_set_dead(port);
 623         }
 624         port->port.drain_delay = 256;
 625         return result;
 626 } /* cypress_open */
 627
 628 static void cypress_dtr_rts(struct usb_serial_port *port, int on)
 629 {
 630         struct cypress_private *priv = usb_get_serial_port_data(port);
 631         /* drop dtr and rts */
 632         spin_lock_irq(&priv->lock);
 633         if (on == 0)
 634                 priv->line_control = 0;
 635         else
 636                 priv->line_control = CONTROL_DTR | CONTROL_RTS;
 637         priv->cmd_ctrl = 1;
 638         spin_unlock_irq(&priv->lock);
 639         cypress_write(NULL, port, NULL, 0);
 640 }
 641
 642 static void cypress_close(struct usb_serial_port *port)
 643 {
 644         struct cypress_private *priv = usb_get_serial_port_data(port);
 645         unsigned long flags;
 646
 647         /* writing is potentially harmful, lock must be taken */
 648         mutex_lock(&port->serial->disc_mutex);
 649         if (port->serial->disconnected) {
 650                 mutex_unlock(&port->serial->disc_mutex);
 651                 return;
 652         }
 653         spin_lock_irqsave(&priv->lock, flags);
 654         kfifo_reset_out(&priv->write_fifo);
 655         spin_unlock_irqrestore(&priv->lock, flags);
 656
 657         dbg("%s - stopping urbs", __func__);
 658         usb_kill_urb(port->interrupt_in_urb);
 659         usb_kill_urb(port->interrupt_out_urb);
 660
 661         if (stats)
 662                 dev_info(&port->dev, "Statistics: %d Bytes In | %d Bytes Out | %d Commands Issued\n",
 663                         priv->bytes_in, priv->bytes_out, priv->cmd_count);
 664         mutex_unlock(&port->serial->disc_mutex);
 665 } /* cypress_close */
 666
 667
 668 static int cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
 669                                         const unsigned char *buf, int count)
 670 {
 671         struct cypress_private *priv = usb_get_serial_port_data(port);
 672
 673         dbg("%s - port %d, %d bytes", __func__, port->number, count);
 674
 675         /* line control commands, which need to be executed immediately,
 676            are not put into the buffer for obvious reasons.
 677          */
 678         if (priv->cmd_ctrl) {
 679                 count = 0;
 680                 goto finish;
 681         }
 682
 683         if (!count)
 684                 return count;
 685
 686         count = kfifo_in_locked(&priv->write_fifo, buf, count, &priv->lock);
 687
 688 finish:
 689         cypress_send(port);
 690
 691         return count;
 692 } /* cypress_write */
 693
 694
 695 static void cypress_send(struct usb_serial_port *port)
 696 {
 697         int count = 0, result, offset, actual_size;
 698         struct cypress_private *priv = usb_get_serial_port_data(port);
 699         unsigned long flags;
 700
 701         if (!priv->comm_is_ok)
 702                 return;
 703
 704         dbg("%s - interrupt out size is %d", __func__,
 705                                                 port->interrupt_out_size);
 706
 707         spin_lock_irqsave(&priv->lock, flags);
 708         if (priv->write_urb_in_use) {
 709                 dbg("%s - can't write, urb in use", __func__);
 710                 spin_unlock_irqrestore(&priv->lock, flags);
 711                 return;
 712         }
 713         spin_unlock_irqrestore(&priv->lock, flags);
 714
 715         /* clear buffer */
 716         memset(port->interrupt_out_urb->transfer_buffer, 0,
 717                                                 port->interrupt_out_size);
 718
 719         spin_lock_irqsave(&priv->lock, flags);
 720         switch (priv->pkt_fmt) {
 721         default:
 722         case packet_format_1:
 723                 /* this is for the CY7C64013... */
 724                 offset = 2;
 725                 port->interrupt_out_buffer[0] = priv->line_control;
 726                 break;
 727         case packet_format_2:
 728                 /* this is for the CY7C63743... */
 729                 offset = 1;
 730                 port->interrupt_out_buffer[0] = priv->line_control;
 731                 break;
 732         }
 733
 734         if (priv->line_control & CONTROL_RESET)
 735                 priv->line_control &= ~CONTROL_RESET;
 736
 737         if (priv->cmd_ctrl) {
 738                 priv->cmd_count++;
 739                 dbg("%s - line control command being issued", __func__);
 740                 spin_unlock_irqrestore(&priv->lock, flags);
 741                 goto send;
 742         } else
 743                 spin_unlock_irqrestore(&priv->lock, flags);
 744
 745         count = kfifo_out_locked(&priv->write_fifo,
 746                                         &port->interrupt_out_buffer[offset],
 747                                         port->interrupt_out_size - offset,
 748                                         &priv->lock);
 749         if (count == 0)
 750                 return;
 751
 752         switch (priv->pkt_fmt) {
 753         default:
 754         case packet_format_1:
 755                 port->interrupt_out_buffer[1] = count;
 756                 break;
 757         case packet_format_2:
 758                 port->interrupt_out_buffer[0] |= count;
 759         }
 760
 761         dbg("%s - count is %d", __func__, count);
 762
 763 send:
 764         spin_lock_irqsave(&priv->lock, flags);
 765         priv->write_urb_in_use = 1;
 766         spin_unlock_irqrestore(&priv->lock, flags);
 767
 768         if (priv->cmd_ctrl)
 769                 actual_size = 1;
 770         else
 771                 actual_size = count +
 772                               (priv->pkt_fmt == packet_format_1 ? 2 : 1);
 773
 774         usb_serial_debug_data(debug, &port->dev, __func__,
 775                 port->interrupt_out_size,
 776                 port->interrupt_out_urb->transfer_buffer);
 777
 778         usb_fill_int_urb(port->interrupt_out_urb, port->serial->dev,
 779                 usb_sndintpipe(port->serial->dev, port->interrupt_out_endpointAddress),
 780                 port->interrupt_out_buffer, port->interrupt_out_size,
 781                 cypress_write_int_callback, port, priv->write_urb_interval);
 782         result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC);
 783         if (result) {
 784                 dev_err_console(port,
 785                                 "%s - failed submitting write urb, error %d\n",
 786                                                         __func__, result);
 787                 priv->write_urb_in_use = 0;
 788                 cypress_set_dead(port);
 789         }
 790
 791         spin_lock_irqsave(&priv->lock, flags);
 792         if (priv->cmd_ctrl)
 793                 priv->cmd_ctrl = 0;
 794
 795         /* do not count the line control and size bytes */
 796         priv->bytes_out += count;
 797         spin_unlock_irqrestore(&priv->lock, flags);
 798
 799         usb_serial_port_softint(port);
 800 } /* cypress_send */
 801
 802
 803 /* returns how much space is available in the soft buffer */
 804 static int cypress_write_room(struct tty_struct *tty)
 805 {
 806         struct usb_serial_port *port = tty->driver_data;
 807         struct cypress_private *priv = usb_get_serial_port_data(port);
 808         int room = 0;
 809         unsigned long flags;
 810
 811         spin_lock_irqsave(&priv->lock, flags);
 812         room = kfifo_avail(&priv->write_fifo);
 813         spin_unlock_irqrestore(&priv->lock, flags);
 814
 815         dbg("%s - returns %d", __func__, room);
 816         return room;
 817 }
 818
 819
 820 static int cypress_tiocmget(struct tty_struct *tty)
 821 {
 822         struct usb_serial_port *port = tty->driver_data;
 823         struct cypress_private *priv = usb_get_serial_port_data(port);
 824         __u8 status, control;
 825         unsigned int result = 0;
 826         unsigned long flags;
 827
 828         spin_lock_irqsave(&priv->lock, flags);
 829         control = priv->line_control;
 830         status = priv->current_status;
 831         spin_unlock_irqrestore(&priv->lock, flags);
 832
 833         result = ((control & CONTROL_DTR)        ? TIOCM_DTR : 0)
 834                 | ((control & CONTROL_RTS)       ? TIOCM_RTS : 0)
 835                 | ((status & UART_CTS)        ? TIOCM_CTS : 0)
 836                 | ((status & UART_DSR)        ? TIOCM_DSR : 0)
 837                 | ((status & UART_RI)         ? TIOCM_RI  : 0)
 838                 | ((status & UART_CD)         ? TIOCM_CD  : 0);
 839
 840         dbg("%s - result = %x", __func__, result);
 841
 842         return result;
 843 }
 844
 845
 846 static int cypress_tiocmset(struct tty_struct *tty,
 847                                unsigned int set, unsigned int clear)
 848 {
 849         struct usb_serial_port *port = tty->driver_data;
 850         struct cypress_private *priv = usb_get_serial_port_data(port);
 851         unsigned long flags;
 852
 853         spin_lock_irqsave(&priv->lock, flags);
 854         if (set & TIOCM_RTS)
 855                 priv->line_control |= CONTROL_RTS;
 856         if (set & TIOCM_DTR)
 857                 priv->line_control |= CONTROL_DTR;
 858         if (clear & TIOCM_RTS)
 859                 priv->line_control &= ~CONTROL_RTS;
 860         if (clear & TIOCM_DTR)
 861                 priv->line_control &= ~CONTROL_DTR;
 862         priv->cmd_ctrl = 1;
 863         spin_unlock_irqrestore(&priv->lock, flags);
 864
 865         return cypress_write(tty, port, NULL, 0);
 866 }
 867
 868
 869 static int cypress_ioctl(struct tty_struct *tty,
 870                                         unsigned int cmd, unsigned long arg)
 871 {
 872         struct usb_serial_port *port = tty->driver_data;
 873         struct cypress_private *priv = usb_get_serial_port_data(port);
 874
 875         dbg("%s - port %d, cmd 0x%.4x", __func__, port->number, cmd);
 876
 877         switch (cmd) {
 878         /* This code comes from drivers/char/serial.c and ftdi_sio.c */
 879         case TIOCMIWAIT:
 880                 while (priv != NULL) {
 881                         interruptible_sleep_on(&priv->delta_msr_wait);
 882                         /* see if a signal did it */
 883                         if (signal_pending(current))
 884                                 return -ERESTARTSYS;
 885                         else {
 886                                 char diff = priv->diff_status;
 887                                 if (diff == 0)
 888                                         return -EIO; /* no change => error */
 889
 890                                 /* consume all events */
 891                                 priv->diff_status = 0;
 892
 893                                 /* return 0 if caller wanted to know about
 894                                    these bits */
 895                                 if (((arg & TIOCM_RNG) && (diff & UART_RI)) ||
 896                                     ((arg & TIOCM_DSR) && (diff & UART_DSR)) ||
 897                                     ((arg & TIOCM_CD) && (diff & UART_CD)) ||
 898                                     ((arg & TIOCM_CTS) && (diff & UART_CTS)))
 899                                         return 0;
 900                                 /* otherwise caller can't care less about what
 901                                  * happened, and so we continue to wait for
 902                                  * more events.
 903                                  */
 904                         }
 905                 }
 906                 return 0;
 907         default:
 908                 break;
 909         }
 910         dbg("%s - arg not supported - it was 0x%04x - check include/asm/ioctls.h", __func__, cmd);
 911         return -ENOIOCTLCMD;
 912 } /* cypress_ioctl */
 913
 914
 915 static void cypress_set_termios(struct tty_struct *tty,
 916         struct usb_serial_port *port, struct ktermios *old_termios)
 917 {
 918         struct cypress_private *priv = usb_get_serial_port_data(port);
 919         int data_bits, stop_bits, parity_type, parity_enable;
 920         unsigned cflag, iflag;
 921         unsigned long flags;
 922         __u8 oldlines;
 923         int linechange = 0;
 924
 925         spin_lock_irqsave(&priv->lock, flags);
 926         /* We can't clean this one up as we don't know the device type
 927            early enough */
 928         if (!priv->termios_initialized) {
 929                 if (priv->chiptype == CT_EARTHMATE) {
 930                         *(tty->termios) = tty_std_termios;
 931                         tty->termios->c_cflag = B4800 | CS8 | CREAD | HUPCL |
 932                                 CLOCAL;
 933                         tty->termios->c_ispeed = 4800;
 934                         tty->termios->c_ospeed = 4800;
 935                 } else if (priv->chiptype == CT_CYPHIDCOM) {
 936                         *(tty->termios) = tty_std_termios;
 937                         tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL |
 938                                 CLOCAL;
 939                         tty->termios->c_ispeed = 9600;
 940                         tty->termios->c_ospeed = 9600;
 941                 } else if (priv->chiptype == CT_CA42V2) {
 942                         *(tty->termios) = tty_std_termios;
 943                         tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL |
 944                                 CLOCAL;
 945                         tty->termios->c_ispeed = 9600;
 946                         tty->termios->c_ospeed = 9600;
 947                 }
 948                 priv->termios_initialized = 1;
 949         }
 950         spin_unlock_irqrestore(&priv->lock, flags);
 951
 952         /* Unsupported features need clearing */
 953         tty->termios->c_cflag &= ~(CMSPAR|CRTSCTS);
 954
 955         cflag = tty->termios->c_cflag;
 956         iflag = tty->termios->c_iflag;
 957
 958         /* check if there are new settings */
 959         if (old_termios) {
 960                 spin_lock_irqsave(&priv->lock, flags);
 961                 priv->tmp_termios = *(tty->termios);
 962                 spin_unlock_irqrestore(&priv->lock, flags);
 963         }
 964
 965         /* set number of data bits, parity, stop bits */
 966         /* when parity is disabled the parity type bit is ignored */
 967
 968         /* 1 means 2 stop bits, 0 means 1 stop bit */
 969         stop_bits = cflag & CSTOPB ? 1 : 0;
 970
 971         if (cflag & PARENB) {
 972                 parity_enable = 1;
 973                 /* 1 means odd parity, 0 means even parity */
 974                 parity_type = cflag & PARODD ? 1 : 0;
 975         } else
 976                 parity_enable = parity_type = 0;
 977
 978         switch (cflag & CSIZE) {
 979         case CS5:
 980                 data_bits = 0;
 981                 break;
 982         case CS6:
 983                 data_bits = 1;
 984                 break;
 985         case CS7:
 986                 data_bits = 2;
 987                 break;
 988         case CS8:
 989                 data_bits = 3;
 990                 break;
 991         default:
 992                 dev_err(&port->dev, "%s - CSIZE was set, but not CS5-CS8\n",
 993                         __func__);
 994                 data_bits = 3;
 995         }
 996         spin_lock_irqsave(&priv->lock, flags);
 997         oldlines = priv->line_control;
 998         if ((cflag & CBAUD) == B0) {
 999                 /* drop dtr and rts */
1000                 dbg("%s - dropping the lines, baud rate 0bps", __func__);
1001                 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
1002         } else
1003                 priv->line_control = (CONTROL_DTR | CONTROL_RTS);
1004         spin_unlock_irqrestore(&priv->lock, flags);
1005
1006         dbg("%s - sending %d stop_bits, %d parity_enable, %d parity_type, "
1007                         "%d data_bits (+5)", __func__, stop_bits,
1008                         parity_enable, parity_type, data_bits);
1009
1010         cypress_serial_control(tty, port, tty_get_baud_rate(tty),
1011                         data_bits, stop_bits,
1012                         parity_enable, parity_type,
1013                         0, CYPRESS_SET_CONFIG);
1014
1015         /* we perform a CYPRESS_GET_CONFIG so that the current settings are
1016          * filled into the private structure this should confirm that all is
1017          * working if it returns what we just set */
1018         cypress_serial_control(tty, port, 0, 0, 0, 0, 0, 0, CYPRESS_GET_CONFIG);
1019
1020         /* Here we can define custom tty settings for devices; the main tty
1021          * termios flag base comes from empeg.c */
1022
1023         spin_lock_irqsave(&priv->lock, flags);
1024         if (priv->chiptype == CT_EARTHMATE && priv->baud_rate == 4800) {
1025                 dbg("Using custom termios settings for a baud rate of "
1026                                 "4800bps.");
1027                 /* define custom termios settings for NMEA protocol */
1028
1029                 tty->termios->c_iflag /* input modes - */
1030                         &= ~(IGNBRK  /* disable ignore break */
1031                         | BRKINT     /* disable break causes interrupt */
1032                         | PARMRK     /* disable mark parity errors */
1033                         | ISTRIP     /* disable clear high bit of input char */
1034                         | INLCR      /* disable translate NL to CR */
1035                         | IGNCR      /* disable ignore CR */
1036                         | ICRNL      /* disable translate CR to NL */
1037                         | IXON);     /* disable enable XON/XOFF flow control */
1038
1039                 tty->termios->c_oflag /* output modes */
1040                         &= ~OPOST;    /* disable postprocess output char */
1041
1042                 tty->termios->c_lflag /* line discipline modes */
1043                         &= ~(ECHO     /* disable echo input characters */
1044                         | ECHONL      /* disable echo new line */
1045                         | ICANON      /* disable erase, kill, werase, and rprnt
1046                                          special characters */
1047                         | ISIG        /* disable interrupt, quit, and suspend
1048                                          special characters */
1049                         | IEXTEN);    /* disable non-POSIX special characters */
1050         } /* CT_CYPHIDCOM: Application should handle this for device */
1051
1052         linechange = (priv->line_control != oldlines);
1053         spin_unlock_irqrestore(&priv->lock, flags);
1054
1055         /* if necessary, set lines */
1056         if (linechange) {
1057                 priv->cmd_ctrl = 1;
1058                 cypress_write(tty, port, NULL, 0);
1059         }
1060 } /* cypress_set_termios */
1061
1062
1063 /* returns amount of data still left in soft buffer */
1064 static int cypress_chars_in_buffer(struct tty_struct *tty)
1065 {
1066         struct usb_serial_port *port = tty->driver_data;
1067         struct cypress_private *priv = usb_get_serial_port_data(port);
1068         int chars = 0;
1069         unsigned long flags;
1070
1071         spin_lock_irqsave(&priv->lock, flags);
1072         chars = kfifo_len(&priv->write_fifo);
1073         spin_unlock_irqrestore(&priv->lock, flags);
1074
1075         dbg("%s - returns %d", __func__, chars);
1076         return chars;
1077 }
1078
1079
1080 static void cypress_throttle(struct tty_struct *tty)
1081 {
1082         struct usb_serial_port *port = tty->driver_data;
1083         struct cypress_private *priv = usb_get_serial_port_data(port);
1084
1085         spin_lock_irq(&priv->lock);
1086         priv->rx_flags = THROTTLED;
1087         spin_unlock_irq(&priv->lock);
1088 }
1089
1090
1091 static void cypress_unthrottle(struct tty_struct *tty)
1092 {
1093         struct usb_serial_port *port = tty->driver_data;
1094         struct cypress_private *priv = usb_get_serial_port_data(port);
1095         int actually_throttled, result;
1096
1097         spin_lock_irq(&priv->lock);
1098         actually_throttled = priv->rx_flags & ACTUALLY_THROTTLED;
1099         priv->rx_flags = 0;
1100         spin_unlock_irq(&priv->lock);
1101
1102         if (!priv->comm_is_ok)
1103                 return;
1104
1105         if (actually_throttled) {
1106                 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
1107                 if (result) {
1108                         dev_err(&port->dev, "%s - failed submitting read urb, "
1109                                         "error %d\n", __func__, result);
1110                         cypress_set_dead(port);
1111                 }
1112         }
1113 }
1114
1115
1116 static void cypress_read_int_callback(struct urb *urb)
1117 {
1118         struct usb_serial_port *port = urb->context;
1119         struct cypress_private *priv = usb_get_serial_port_data(port);
1120         struct tty_struct *tty;
1121         unsigned char *data = urb->transfer_buffer;
1122         unsigned long flags;
1123         char tty_flag = TTY_NORMAL;
1124         int havedata = 0;
1125         int bytes = 0;
1126         int result;
1127         int i = 0;
1128         int status = urb->status;
1129
1130         switch (status) {
1131         case 0: /* success */
1132                 break;
1133         case -ECONNRESET:
1134         case -ENOENT:
1135         case -ESHUTDOWN:
1136                 /* precursor to disconnect so just go away */
1137                 return;
1138         case -EPIPE:
1139                 /* Can't call usb_clear_halt while in_interrupt */
1140                 /* FALLS THROUGH */
1141         default:
1142                 /* something ugly is going on... */
1143                 dev_err(&urb->dev->dev,
1144                         "%s - unexpected nonzero read status received: %d\n",
1145                                                         __func__, status);
1146                 cypress_set_dead(port);
1147                 return;
1148         }
1149
1150         spin_lock_irqsave(&priv->lock, flags);
1151         if (priv->rx_flags & THROTTLED) {
1152                 dbg("%s - now throttling", __func__);
1153                 priv->rx_flags |= ACTUALLY_THROTTLED;
1154                 spin_unlock_irqrestore(&priv->lock, flags);
1155                 return;
1156         }
1157         spin_unlock_irqrestore(&priv->lock, flags);
1158
1159         tty = tty_port_tty_get(&port->port);
1160         if (!tty) {
1161                 dbg("%s - bad tty pointer - exiting", __func__);
1162                 return;
1163         }
1164
1165         spin_lock_irqsave(&priv->lock, flags);
1166         result = urb->actual_length;
1167         switch (priv->pkt_fmt) {
1168         default:
1169         case packet_format_1:
1170                 /* This is for the CY7C64013... */
1171                 priv->current_status = data[0] & 0xF8;
1172                 bytes = data[1] + 2;
1173                 i = 2;
1174                 if (bytes > 2)
1175                         havedata = 1;
1176                 break;
1177         case packet_format_2:
1178                 /* This is for the CY7C63743... */
1179                 priv->current_status = data[0] & 0xF8;
1180                 bytes = (data[0] & 0x07) + 1;
1181                 i = 1;
1182                 if (bytes > 1)
1183                         havedata = 1;
1184                 break;
1185         }
1186         spin_unlock_irqrestore(&priv->lock, flags);
1187         if (result < bytes) {
1188                 dbg("%s - wrong packet size - received %d bytes but packet "
1189                     "said %d bytes", __func__, result, bytes);
1190                 goto continue_read;
1191         }
1192
1193         usb_serial_debug_data(debug, &port->dev, __func__,
1194                                                 urb->actual_length, data);
1195
1196         spin_lock_irqsave(&priv->lock, flags);
1197         /* check to see if status has changed */
1198         if (priv->current_status != priv->prev_status) {
1199                 priv->diff_status |= priv->current_status ^
1200                         priv->prev_status;
1201                 wake_up_interruptible(&priv->delta_msr_wait);
1202                 priv->prev_status = priv->current_status;
1203         }
1204         spin_unlock_irqrestore(&priv->lock, flags);
1205
1206         /* hangup, as defined in acm.c... this might be a bad place for it
1207          * though */
1208         if (tty && !(tty->termios->c_cflag & CLOCAL) &&
1209                         !(priv->current_status & UART_CD)) {
1210                 dbg("%s - calling hangup", __func__);
1211                 tty_hangup(tty);
1212                 goto continue_read;
1213         }
1214
1215         /* There is one error bit... I'm assuming it is a parity error
1216          * indicator as the generic firmware will set this bit to 1 if a
1217          * parity error occurs.
1218          * I can not find reference to any other error events. */
1219         spin_lock_irqsave(&priv->lock, flags);
1220         if (priv->current_status & CYP_ERROR) {
1221                 spin_unlock_irqrestore(&priv->lock, flags);
1222                 tty_flag = TTY_PARITY;
1223                 dbg("%s - Parity Error detected", __func__);
1224         } else
1225                 spin_unlock_irqrestore(&priv->lock, flags);
1226
1227         /* process read if there is data other than line status */
1228         if (tty && bytes > i) {
1229                 tty_insert_flip_string_fixed_flag(tty, data + i,
1230                                 tty_flag, bytes - i);
1231                 tty_flip_buffer_push(tty);
1232         }
1233
1234         spin_lock_irqsave(&priv->lock, flags);
1235         /* control and status byte(s) are also counted */
1236         priv->bytes_in += bytes;
1237         spin_unlock_irqrestore(&priv->lock, flags);
1238
1239 continue_read:
1240         tty_kref_put(tty);
1241
1242         /* Continue trying to always read */
1243
1244         if (priv->comm_is_ok) {
1245                 usb_fill_int_urb(port->interrupt_in_urb, port->serial->dev,
1246                                 usb_rcvintpipe(port->serial->dev,
1247                                         port->interrupt_in_endpointAddress),
1248                                 port->interrupt_in_urb->transfer_buffer,
1249                                 port->interrupt_in_urb->transfer_buffer_length,
1250                                 cypress_read_int_callback, port,
1251                                 priv->read_urb_interval);
1252                 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
1253                 if (result && result != -EPERM) {
1254                         dev_err(&urb->dev->dev, "%s - failed resubmitting "
1255                                         "read urb, error %d\n", __func__,
1256                                         result);
1257                         cypress_set_dead(port);
1258                 }
1259         }
1260 } /* cypress_read_int_callback */
1261
1262
1263 static void cypress_write_int_callback(struct urb *urb)
1264 {
1265         struct usb_serial_port *port = urb->context;
1266         struct cypress_private *priv = usb_get_serial_port_data(port);
1267         int result;
1268         int status = urb->status;
1269
1270         switch (status) {
1271         case 0:
1272                 /* success */
1273                 break;
1274         case -ECONNRESET:
1275         case -ENOENT:
1276         case -ESHUTDOWN:
1277                 /* this urb is terminated, clean up */
1278                 dbg("%s - urb shutting down with status: %d",
1279                                                 __func__, status);
1280                 priv->write_urb_in_use = 0;
1281                 return;
1282         case -EPIPE: /* no break needed; clear halt and resubmit */
1283                 if (!priv->comm_is_ok)
1284                         break;
1285                 usb_clear_halt(port->serial->dev, 0x02);
1286                 /* error in the urb, so we have to resubmit it */
1287                 dbg("%s - nonzero write bulk status received: %d",
1288                         __func__, status);
1289                 port->interrupt_out_urb->transfer_buffer_length = 1;
1290                 result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC);
1291                 if (!result)
1292                         return;
1293                 dev_err(&urb->dev->dev,
1294                         "%s - failed resubmitting write urb, error %d\n",
1295                                                         __func__, result);
1296                 cypress_set_dead(port);
1297                 break;
1298         default:
1299                 dev_err(&urb->dev->dev,
1300                          "%s - unexpected nonzero write status received: %d\n",
1301                                                         __func__, status);
1302                 cypress_set_dead(port);
1303                 break;
1304         }
1305         priv->write_urb_in_use = 0;
1306
1307         /* send any buffered data */
1308         cypress_send(port);
1309 }
1310
1311 module_usb_serial_driver(cypress_driver, serial_drivers);
1312
1313 MODULE_AUTHOR(DRIVER_AUTHOR);
1314 MODULE_DESCRIPTION(DRIVER_DESC);
1315 MODULE_VERSION(DRIVER_VERSION);
1316 MODULE_LICENSE("GPL");
1317
1318 module_param(debug, bool, S_IRUGO | S_IWUSR);
1319 MODULE_PARM_DESC(debug, "Debug enabled or not");
1320 module_param(stats, bool, S_IRUGO | S_IWUSR);
1321 MODULE_PARM_DESC(stats, "Enable statistics or not");
1322 module_param(interval, int, S_IRUGO | S_IWUSR);
1323 MODULE_PARM_DESC(interval, "Overrides interrupt interval");
1324 module_param(unstable_bauds, bool, S_IRUGO | S_IWUSR);
1325 MODULE_PARM_DESC(unstable_bauds, "Allow unstable baud rates");