drivers/usb/serial/cypress_m8.c

   1 /*
   2  * USB Cypress M8 driver
   3  *
   4  *      Copyright (C) 2004
   5  *          Lonnie Mendez (dignome@gmail.com)
   6  *      Copyright (C) 2003,2004
   7  *          Neil Whelchel (koyama@firstlight.net)
   8  *
   9  *      This program is free software; you can redistribute it and/or modify
  10  *      it under the terms of the GNU General Public License as published by
  11  *      the Free Software Foundation; either version 2 of the License, or
  12  *      (at your option) any later version.
  13  *
  14  * See Documentation/usb/usb-serial.txt for more information on using this
  15  * driver
  16  *
  17  * See http://geocities.com/i0xox0i for information on this driver and the
  18  * earthmate usb device.
  19  */
  20
  21 /* Thanks to Neil Whelchel for writing the first cypress m8 implementation
  22    for linux. */
  23 /* Thanks to cypress for providing references for the hid reports. */
  24 /* Thanks to Jiang Zhang for providing links and for general help. */
  25 /* Code originates and was built up from ftdi_sio, belkin, pl2303 and others.*/
  26
  27
  28 #include <linux/kernel.h>
  29 #include <linux/errno.h>
  30 #include <linux/init.h>
  31 #include <linux/slab.h>
  32 #include <linux/tty.h>
  33 #include <linux/tty_driver.h>
  34 #include <linux/tty_flip.h>
  35 #include <linux/module.h>
  36 #include <linux/moduleparam.h>
  37 #include <linux/spinlock.h>
  38 #include <linux/usb.h>
  39 #include <linux/usb/serial.h>
  40 #include <linux/serial.h>
  41 #include <linux/kfifo.h>
  42 #include <linux/delay.h>
  43 #include <linux/uaccess.h>
  44 #include <asm/unaligned.h>
  45
  46 #include "cypress_m8.h"
  47
  48
  49 static bool stats;
  50 static int interval;
  51 static bool unstable_bauds;
  52
  53 #define DRIVER_AUTHOR "Lonnie Mendez <dignome@gmail.com>, Neil Whelchel <koyama@firstlight.net>"
  54 #define DRIVER_DESC "Cypress USB to Serial Driver"
  55
  56 /* write buffer size defines */
  57 #define CYPRESS_BUF_SIZE        1024
  58
  59 static const struct usb_device_id id_table_earthmate[] = {
  60         { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
  61         { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
  62         { }                                             /* Terminating entry */
  63 };
  64
  65 static const struct usb_device_id id_table_cyphidcomrs232[] = {
  66         { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
  67         { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) },
  68         { }                                             /* Terminating entry */
  69 };
  70
  71 static const struct usb_device_id id_table_nokiaca42v2[] = {
  72         { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
  73         { }                                             /* Terminating entry */
  74 };
  75
  76 static const struct usb_device_id id_table_combined[] = {
  77         { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
  78         { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
  79         { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
  80         { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) },
  81         { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
  82         { }                                             /* Terminating entry */
  83 };
  84
  85 MODULE_DEVICE_TABLE(usb, id_table_combined);
  86
  87 enum packet_format {
  88         packet_format_1,  /* b0:status, b1:payload count */
  89         packet_format_2   /* b0[7:3]:status, b0[2:0]:payload count */
  90 };
  91
  92 struct cypress_private {
  93         spinlock_t lock;                   /* private lock */
  94         int chiptype;                      /* identifier of device, for quirks/etc */
  95         int bytes_in;                      /* used for statistics */
  96         int bytes_out;                     /* used for statistics */
  97         int cmd_count;                     /* used for statistics */
  98         int cmd_ctrl;                      /* always set this to 1 before issuing a command */
  99         struct kfifo write_fifo;           /* write fifo */
 100         int write_urb_in_use;              /* write urb in use indicator */
 101         int write_urb_interval;            /* interval to use for write urb */
 102         int read_urb_interval;             /* interval to use for read urb */
 103         int comm_is_ok;                    /* true if communication is (still) ok */
 104         int termios_initialized;
 105         __u8 line_control;                 /* holds dtr / rts value */
 106         __u8 current_status;               /* received from last read - info on dsr,cts,cd,ri,etc */
 107         __u8 current_config;               /* stores the current configuration byte */
 108         __u8 rx_flags;                     /* throttling - used from whiteheat/ftdi_sio */
 109         enum packet_format pkt_fmt;        /* format to use for packet send / receive */
 110         int get_cfg_unsafe;                /* If true, the CYPRESS_GET_CONFIG is unsafe */
 111         int baud_rate;                     /* stores current baud rate in
 112                                               integer form */
 113         int isthrottled;                   /* if throttled, discard reads */
 114         char prev_status, diff_status;     /* used for TIOCMIWAIT */
 115         /* we pass a pointer to this as the argument sent to
 116            cypress_set_termios old_termios */
 117         struct ktermios tmp_termios;       /* stores the old termios settings */
 118 };
 119
 120 /* function prototypes for the Cypress USB to serial device */
 121 static int  cypress_earthmate_port_probe(struct usb_serial_port *port);
 122 static int  cypress_hidcom_port_probe(struct usb_serial_port *port);
 123 static int  cypress_ca42v2_port_probe(struct usb_serial_port *port);
 124 static int  cypress_port_remove(struct usb_serial_port *port);
 125 static int  cypress_open(struct tty_struct *tty, struct usb_serial_port *port);
 126 static void cypress_close(struct usb_serial_port *port);
 127 static void cypress_dtr_rts(struct usb_serial_port *port, int on);
 128 static int  cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
 129                         const unsigned char *buf, int count);
 130 static void cypress_send(struct usb_serial_port *port);
 131 static int  cypress_write_room(struct tty_struct *tty);
 132 static int  cypress_ioctl(struct tty_struct *tty,
 133                         unsigned int cmd, unsigned long arg);
 134 static void cypress_set_termios(struct tty_struct *tty,
 135                         struct usb_serial_port *port, struct ktermios *old);
 136 static int  cypress_tiocmget(struct tty_struct *tty);
 137 static int  cypress_tiocmset(struct tty_struct *tty,
 138                         unsigned int set, unsigned int clear);
 139 static int  cypress_chars_in_buffer(struct tty_struct *tty);
 140 static void cypress_throttle(struct tty_struct *tty);
 141 static void cypress_unthrottle(struct tty_struct *tty);
 142 static void cypress_set_dead(struct usb_serial_port *port);
 143 static void cypress_read_int_callback(struct urb *urb);
 144 static void cypress_write_int_callback(struct urb *urb);
 145
 146 static struct usb_serial_driver cypress_earthmate_device = {
 147         .driver = {
 148                 .owner =                THIS_MODULE,
 149                 .name =                 "earthmate",
 150         },
 151         .description =                  "DeLorme Earthmate USB",
 152         .id_table =                     id_table_earthmate,
 153         .num_ports =                    1,
 154         .port_probe =                   cypress_earthmate_port_probe,
 155         .port_remove =                  cypress_port_remove,
 156         .open =                         cypress_open,
 157         .close =                        cypress_close,
 158         .dtr_rts =                      cypress_dtr_rts,
 159         .write =                        cypress_write,
 160         .write_room =                   cypress_write_room,
 161         .ioctl =                        cypress_ioctl,
 162         .set_termios =                  cypress_set_termios,
 163         .tiocmget =                     cypress_tiocmget,
 164         .tiocmset =                     cypress_tiocmset,
 165         .chars_in_buffer =              cypress_chars_in_buffer,
 166         .throttle =                     cypress_throttle,
 167         .unthrottle =                   cypress_unthrottle,
 168         .read_int_callback =            cypress_read_int_callback,
 169         .write_int_callback =           cypress_write_int_callback,
 170 };
 171
 172 static struct usb_serial_driver cypress_hidcom_device = {
 173         .driver = {
 174                 .owner =                THIS_MODULE,
 175                 .name =                 "cyphidcom",
 176         },
 177         .description =                  "HID->COM RS232 Adapter",
 178         .id_table =                     id_table_cyphidcomrs232,
 179         .num_ports =                    1,
 180         .port_probe =                   cypress_hidcom_port_probe,
 181         .port_remove =                  cypress_port_remove,
 182         .open =                         cypress_open,
 183         .close =                        cypress_close,
 184         .dtr_rts =                      cypress_dtr_rts,
 185         .write =                        cypress_write,
 186         .write_room =                   cypress_write_room,
 187         .ioctl =                        cypress_ioctl,
 188         .set_termios =                  cypress_set_termios,
 189         .tiocmget =                     cypress_tiocmget,
 190         .tiocmset =                     cypress_tiocmset,
 191         .chars_in_buffer =              cypress_chars_in_buffer,
 192         .throttle =                     cypress_throttle,
 193         .unthrottle =                   cypress_unthrottle,
 194         .read_int_callback =            cypress_read_int_callback,
 195         .write_int_callback =           cypress_write_int_callback,
 196 };
 197
 198 static struct usb_serial_driver cypress_ca42v2_device = {
 199         .driver = {
 200                 .owner =                THIS_MODULE,
 201                 .name =                 "nokiaca42v2",
 202         },
 203         .description =                  "Nokia CA-42 V2 Adapter",
 204         .id_table =                     id_table_nokiaca42v2,
 205         .num_ports =                    1,
 206         .port_probe =                   cypress_ca42v2_port_probe,
 207         .port_remove =                  cypress_port_remove,
 208         .open =                         cypress_open,
 209         .close =                        cypress_close,
 210         .dtr_rts =                      cypress_dtr_rts,
 211         .write =                        cypress_write,
 212         .write_room =                   cypress_write_room,
 213         .ioctl =                        cypress_ioctl,
 214         .set_termios =                  cypress_set_termios,
 215         .tiocmget =                     cypress_tiocmget,
 216         .tiocmset =                     cypress_tiocmset,
 217         .chars_in_buffer =              cypress_chars_in_buffer,
 218         .throttle =                     cypress_throttle,
 219         .unthrottle =                   cypress_unthrottle,
 220         .read_int_callback =            cypress_read_int_callback,
 221         .write_int_callback =           cypress_write_int_callback,
 222 };
 223
 224 static struct usb_serial_driver * const serial_drivers[] = {
 225         &cypress_earthmate_device, &cypress_hidcom_device,
 226         &cypress_ca42v2_device, NULL
 227 };
 228
 229 /*****************************************************************************
 230  * Cypress serial helper functions
 231  *****************************************************************************/
 232
 233
 234 static int analyze_baud_rate(struct usb_serial_port *port, speed_t new_rate)
 235 {
 236         struct cypress_private *priv;
 237         priv = usb_get_serial_port_data(port);
 238
 239         if (unstable_bauds)
 240                 return new_rate;
 241
 242         /*
 243          * The general purpose firmware for the Cypress M8 allows for
 244          * a maximum speed of 57600bps (I have no idea whether DeLorme
 245          * chose to use the general purpose firmware or not), if you
 246          * need to modify this speed setting for your own project
 247          * please add your own chiptype and modify the code likewise.
 248          * The Cypress HID->COM device will work successfully up to
 249          * 115200bps (but the actual throughput is around 3kBps).
 250          */
 251         if (port->serial->dev->speed == USB_SPEED_LOW) {
 252                 /*
 253                  * Mike Isely <isely@pobox.com> 2-Feb-2008: The
 254                  * Cypress app note that describes this mechanism
 255                  * states the the low-speed part can't handle more
 256                  * than 800 bytes/sec, in which case 4800 baud is the
 257                  * safest speed for a part like that.
 258                  */
 259                 if (new_rate > 4800) {
 260                         dev_dbg(&port->dev,
 261                                 "%s - failed setting baud rate, device incapable speed %d\n",
 262                                 __func__, new_rate);
 263                         return -1;
 264                 }
 265         }
 266         switch (priv->chiptype) {
 267         case CT_EARTHMATE:
 268                 if (new_rate <= 600) {
 269                         /* 300 and 600 baud rates are supported under
 270                          * the generic firmware, but are not used with
 271                          * NMEA and SiRF protocols */
 272                         dev_dbg(&port->dev,
 273                                 "%s - failed setting baud rate, unsupported speed of %d on Earthmate GPS",
 274                                 __func__, new_rate);
 275                         return -1;
 276                 }
 277                 break;
 278         default:
 279                 break;
 280         }
 281         return new_rate;
 282 }
 283
 284
 285 /* This function can either set or retrieve the current serial line settings */
 286 static int cypress_serial_control(struct tty_struct *tty,
 287         struct usb_serial_port *port, speed_t baud_rate, int data_bits,
 288         int stop_bits, int parity_enable, int parity_type, int reset,
 289         int cypress_request_type)
 290 {
 291         int new_baudrate = 0, retval = 0, tries = 0;
 292         struct cypress_private *priv;
 293         struct device *dev = &port->dev;
 294         u8 *feature_buffer;
 295         const unsigned int feature_len = 5;
 296         unsigned long flags;
 297
 298         priv = usb_get_serial_port_data(port);
 299
 300         if (!priv->comm_is_ok)
 301                 return -ENODEV;
 302
 303         feature_buffer = kcalloc(feature_len, sizeof(u8), GFP_KERNEL);
 304         if (!feature_buffer)
 305                 return -ENOMEM;
 306
 307         switch (cypress_request_type) {
 308         case CYPRESS_SET_CONFIG:
 309                 /* 0 means 'Hang up' so doesn't change the true bit rate */
 310                 new_baudrate = priv->baud_rate;
 311                 if (baud_rate && baud_rate != priv->baud_rate) {
 312                         dev_dbg(dev, "%s - baud rate is changing\n", __func__);
 313                         retval = analyze_baud_rate(port, baud_rate);
 314                         if (retval >= 0) {
 315                                 new_baudrate = retval;
 316                                 dev_dbg(dev, "%s - New baud rate set to %d\n",
 317                                         __func__, new_baudrate);
 318                         }
 319                 }
 320                 dev_dbg(dev, "%s - baud rate is being sent as %d\n", __func__,
 321                         new_baudrate);
 322
 323                 /* fill the feature_buffer with new configuration */
 324                 put_unaligned_le32(new_baudrate, feature_buffer);
 325                 feature_buffer[4] |= data_bits;   /* assign data bits in 2 bit space ( max 3 ) */
 326                 /* 1 bit gap */
 327                 feature_buffer[4] |= (stop_bits << 3);   /* assign stop bits in 1 bit space */
 328                 feature_buffer[4] |= (parity_enable << 4);   /* assign parity flag in 1 bit space */
 329                 feature_buffer[4] |= (parity_type << 5);   /* assign parity type in 1 bit space */
 330                 /* 1 bit gap */
 331                 feature_buffer[4] |= (reset << 7);   /* assign reset at end of byte, 1 bit space */
 332
 333                 dev_dbg(dev, "%s - device is being sent this feature report:\n", __func__);
 334                 dev_dbg(dev, "%s - %02X - %02X - %02X - %02X - %02X\n", __func__,
 335                         feature_buffer[0], feature_buffer[1],
 336                         feature_buffer[2], feature_buffer[3],
 337                         feature_buffer[4]);
 338
 339                 do {
 340                         retval = usb_control_msg(port->serial->dev,
 341                                         usb_sndctrlpipe(port->serial->dev, 0),
 342                                         HID_REQ_SET_REPORT,
 343                                         USB_DIR_OUT | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
 344                                         0x0300, 0, feature_buffer,
 345                                         feature_len, 500);
 346
 347                         if (tries++ >= 3)
 348                                 break;
 349
 350                 } while (retval != feature_len &&
 351                          retval != -ENODEV);
 352
 353                 if (retval != feature_len) {
 354                         dev_err(dev, "%s - failed sending serial line settings - %d\n",
 355                                 __func__, retval);
 356                         cypress_set_dead(port);
 357                 } else {
 358                         spin_lock_irqsave(&priv->lock, flags);
 359                         priv->baud_rate = new_baudrate;
 360                         priv->current_config = feature_buffer[4];
 361                         spin_unlock_irqrestore(&priv->lock, flags);
 362                         /* If we asked for a speed change encode it */
 363                         if (baud_rate)
 364                                 tty_encode_baud_rate(tty,
 365                                         new_baudrate, new_baudrate);
 366                 }
 367         break;
 368         case CYPRESS_GET_CONFIG:
 369                 if (priv->get_cfg_unsafe) {
 370                         /* Not implemented for this device,
 371                            and if we try to do it we're likely
 372                            to crash the hardware. */
 373                         retval = -ENOTTY;
 374                         goto out;
 375                 }
 376                 dev_dbg(dev, "%s - retreiving serial line settings\n", __func__);
 377                 do {
 378                         retval = usb_control_msg(port->serial->dev,
 379                                         usb_rcvctrlpipe(port->serial->dev, 0),
 380                                         HID_REQ_GET_REPORT,
 381                                         USB_DIR_IN | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
 382                                         0x0300, 0, feature_buffer,
 383                                         feature_len, 500);
 384
 385                         if (tries++ >= 3)
 386                                 break;
 387                 } while (retval != feature_len
 388                                                 && retval != -ENODEV);
 389
 390                 if (retval != feature_len) {
 391                         dev_err(dev, "%s - failed to retrieve serial line settings - %d\n",
 392                                 __func__, retval);
 393                         cypress_set_dead(port);
 394                         goto out;
 395                 } else {
 396                         spin_lock_irqsave(&priv->lock, flags);
 397                         /* store the config in one byte, and later
 398                            use bit masks to check values */
 399                         priv->current_config = feature_buffer[4];
 400                         priv->baud_rate = get_unaligned_le32(feature_buffer);
 401                         spin_unlock_irqrestore(&priv->lock, flags);
 402                 }
 403         }
 404         spin_lock_irqsave(&priv->lock, flags);
 405         ++priv->cmd_count;
 406         spin_unlock_irqrestore(&priv->lock, flags);
 407 out:
 408         kfree(feature_buffer);
 409         return retval;
 410 } /* cypress_serial_control */
 411
 412
 413 static void cypress_set_dead(struct usb_serial_port *port)
 414 {
 415         struct cypress_private *priv = usb_get_serial_port_data(port);
 416         unsigned long flags;
 417
 418         spin_lock_irqsave(&priv->lock, flags);
 419         if (!priv->comm_is_ok) {
 420                 spin_unlock_irqrestore(&priv->lock, flags);
 421                 return;
 422         }
 423         priv->comm_is_ok = 0;
 424         spin_unlock_irqrestore(&priv->lock, flags);
 425
 426         dev_err(&port->dev, "cypress_m8 suspending failing port %d - "
 427                 "interval might be too short\n", port->number);
 428 }
 429
 430
 431 /*****************************************************************************
 432  * Cypress serial driver functions
 433  *****************************************************************************/
 434
 435
 436 static int cypress_generic_port_probe(struct usb_serial_port *port)
 437 {
 438         struct usb_serial *serial = port->serial;
 439         struct cypress_private *priv;
 440
 441         priv = kzalloc(sizeof(struct cypress_private), GFP_KERNEL);
 442         if (!priv)
 443                 return -ENOMEM;
 444
 445         priv->comm_is_ok = !0;
 446         spin_lock_init(&priv->lock);
 447         if (kfifo_alloc(&priv->write_fifo, CYPRESS_BUF_SIZE, GFP_KERNEL)) {
 448                 kfree(priv);
 449                 return -ENOMEM;
 450         }
 451
 452         usb_reset_configuration(serial->dev);
 453
 454         priv->cmd_ctrl = 0;
 455         priv->line_control = 0;
 456         priv->termios_initialized = 0;
 457         priv->rx_flags = 0;
 458         /* Default packet format setting is determined by packet size.
 459            Anything with a size larger then 9 must have a separate
 460            count field since the 3 bit count field is otherwise too
 461            small.  Otherwise we can use the slightly more compact
 462            format.  This is in accordance with the cypress_m8 serial
 463            converter app note. */
 464         if (port->interrupt_out_size > 9)
 465                 priv->pkt_fmt = packet_format_1;
 466         else
 467                 priv->pkt_fmt = packet_format_2;
 468
 469         if (interval > 0) {
 470                 priv->write_urb_interval = interval;
 471                 priv->read_urb_interval = interval;
 472                 dev_dbg(&port->dev, "%s - read & write intervals forced to %d\n",
 473                         __func__, interval);
 474         } else {
 475                 priv->write_urb_interval = port->interrupt_out_urb->interval;
 476                 priv->read_urb_interval = port->interrupt_in_urb->interval;
 477                 dev_dbg(&port->dev, "%s - intervals: read=%d write=%d\n",
 478                         __func__, priv->read_urb_interval,
 479                         priv->write_urb_interval);
 480         }
 481         usb_set_serial_port_data(port, priv);
 482
 483         return 0;
 484 }
 485
 486
 487 static int cypress_earthmate_port_probe(struct usb_serial_port *port)
 488 {
 489         struct usb_serial *serial = port->serial;
 490         struct cypress_private *priv;
 491         int ret;
 492
 493         ret = cypress_generic_port_probe(port);
 494         if (ret) {
 495                 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
 496                 return ret;
 497         }
 498
 499         priv = usb_get_serial_port_data(port);
 500         priv->chiptype = CT_EARTHMATE;
 501         /* All Earthmate devices use the separated-count packet
 502            format!  Idiotic. */
 503         priv->pkt_fmt = packet_format_1;
 504         if (serial->dev->descriptor.idProduct !=
 505                                 cpu_to_le16(PRODUCT_ID_EARTHMATEUSB)) {
 506                 /* The old original USB Earthmate seemed able to
 507                    handle GET_CONFIG requests; everything they've
 508                    produced since that time crashes if this command is
 509                    attempted :-( */
 510                 dev_dbg(&port->dev,
 511                         "%s - Marking this device as unsafe for GET_CONFIG commands\n",
 512                         __func__);
 513                 priv->get_cfg_unsafe = !0;
 514         }
 515
 516         return 0;
 517 }
 518
 519 static int cypress_hidcom_port_probe(struct usb_serial_port *port)
 520 {
 521         struct cypress_private *priv;
 522         int ret;
 523
 524         ret = cypress_generic_port_probe(port);
 525         if (ret) {
 526                 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
 527                 return ret;
 528         }
 529
 530         priv = usb_get_serial_port_data(port);
 531         priv->chiptype = CT_CYPHIDCOM;
 532
 533         return 0;
 534 }
 535
 536 static int cypress_ca42v2_port_probe(struct usb_serial_port *port)
 537 {
 538         struct cypress_private *priv;
 539         int ret;
 540
 541         ret = cypress_generic_port_probe(port);
 542         if (ret) {
 543                 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
 544                 return ret;
 545         }
 546
 547         priv = usb_get_serial_port_data(port);
 548         priv->chiptype = CT_CA42V2;
 549
 550         return 0;
 551 }
 552
 553 static int cypress_port_remove(struct usb_serial_port *port)
 554 {
 555         struct cypress_private *priv;
 556
 557         priv = usb_get_serial_port_data(port);
 558
 559         kfifo_free(&priv->write_fifo);
 560         kfree(priv);
 561
 562         return 0;
 563 }
 564
 565 static int cypress_open(struct tty_struct *tty, struct usb_serial_port *port)
 566 {
 567         struct cypress_private *priv = usb_get_serial_port_data(port);
 568         struct usb_serial *serial = port->serial;
 569         unsigned long flags;
 570         int result = 0;
 571
 572         if (!priv->comm_is_ok)
 573                 return -EIO;
 574
 575         /* clear halts before open */
 576         usb_clear_halt(serial->dev, 0x81);
 577         usb_clear_halt(serial->dev, 0x02);
 578
 579         spin_lock_irqsave(&priv->lock, flags);
 580         /* reset read/write statistics */
 581         priv->bytes_in = 0;
 582         priv->bytes_out = 0;
 583         priv->cmd_count = 0;
 584         priv->rx_flags = 0;
 585         spin_unlock_irqrestore(&priv->lock, flags);
 586
 587         /* Set termios */
 588         cypress_send(port);
 589
 590         if (tty)
 591                 cypress_set_termios(tty, port, &priv->tmp_termios);
 592
 593         /* setup the port and start reading from the device */
 594         if (!port->interrupt_in_urb) {
 595                 dev_err(&port->dev, "%s - interrupt_in_urb is empty!\n",
 596                         __func__);
 597                 return -1;
 598         }
 599
 600         usb_fill_int_urb(port->interrupt_in_urb, serial->dev,
 601                 usb_rcvintpipe(serial->dev, port->interrupt_in_endpointAddress),
 602                 port->interrupt_in_urb->transfer_buffer,
 603                 port->interrupt_in_urb->transfer_buffer_length,
 604                 cypress_read_int_callback, port, priv->read_urb_interval);
 605         result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
 606
 607         if (result) {
 608                 dev_err(&port->dev,
 609                         "%s - failed submitting read urb, error %d\n",
 610                                                         __func__, result);
 611                 cypress_set_dead(port);
 612         }
 613         port->port.drain_delay = 256;
 614         return result;
 615 } /* cypress_open */
 616
 617 static void cypress_dtr_rts(struct usb_serial_port *port, int on)
 618 {
 619         struct cypress_private *priv = usb_get_serial_port_data(port);
 620         /* drop dtr and rts */
 621         spin_lock_irq(&priv->lock);
 622         if (on == 0)
 623                 priv->line_control = 0;
 624         else
 625                 priv->line_control = CONTROL_DTR | CONTROL_RTS;
 626         priv->cmd_ctrl = 1;
 627         spin_unlock_irq(&priv->lock);
 628         cypress_write(NULL, port, NULL, 0);
 629 }
 630
 631 static void cypress_close(struct usb_serial_port *port)
 632 {
 633         struct cypress_private *priv = usb_get_serial_port_data(port);
 634         unsigned long flags;
 635
 636         /* writing is potentially harmful, lock must be taken */
 637         mutex_lock(&port->serial->disc_mutex);
 638         if (port->serial->disconnected) {
 639                 mutex_unlock(&port->serial->disc_mutex);
 640                 return;
 641         }
 642         spin_lock_irqsave(&priv->lock, flags);
 643         kfifo_reset_out(&priv->write_fifo);
 644         spin_unlock_irqrestore(&priv->lock, flags);
 645
 646         dev_dbg(&port->dev, "%s - stopping urbs\n", __func__);
 647         usb_kill_urb(port->interrupt_in_urb);
 648         usb_kill_urb(port->interrupt_out_urb);
 649
 650         if (stats)
 651                 dev_info(&port->dev, "Statistics: %d Bytes In | %d Bytes Out | %d Commands Issued\n",
 652                         priv->bytes_in, priv->bytes_out, priv->cmd_count);
 653         mutex_unlock(&port->serial->disc_mutex);
 654 } /* cypress_close */
 655
 656
 657 static int cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
 658                                         const unsigned char *buf, int count)
 659 {
 660         struct cypress_private *priv = usb_get_serial_port_data(port);
 661
 662         dev_dbg(&port->dev, "%s - port %d, %d bytes\n", __func__, port->number, count);
 663
 664         /* line control commands, which need to be executed immediately,
 665            are not put into the buffer for obvious reasons.
 666          */
 667         if (priv->cmd_ctrl) {
 668                 count = 0;
 669                 goto finish;
 670         }
 671
 672         if (!count)
 673                 return count;
 674
 675         count = kfifo_in_locked(&priv->write_fifo, buf, count, &priv->lock);
 676
 677 finish:
 678         cypress_send(port);
 679
 680         return count;
 681 } /* cypress_write */
 682
 683
 684 static void cypress_send(struct usb_serial_port *port)
 685 {
 686         int count = 0, result, offset, actual_size;
 687         struct cypress_private *priv = usb_get_serial_port_data(port);
 688         struct device *dev = &port->dev;
 689         unsigned long flags;
 690
 691         if (!priv->comm_is_ok)
 692                 return;
 693
 694         dev_dbg(dev, "%s - interrupt out size is %d\n", __func__,
 695                 port->interrupt_out_size);
 696
 697         spin_lock_irqsave(&priv->lock, flags);
 698         if (priv->write_urb_in_use) {
 699                 dev_dbg(dev, "%s - can't write, urb in use\n", __func__);
 700                 spin_unlock_irqrestore(&priv->lock, flags);
 701                 return;
 702         }
 703         spin_unlock_irqrestore(&priv->lock, flags);
 704
 705         /* clear buffer */
 706         memset(port->interrupt_out_urb->transfer_buffer, 0,
 707                                                 port->interrupt_out_size);
 708
 709         spin_lock_irqsave(&priv->lock, flags);
 710         switch (priv->pkt_fmt) {
 711         default:
 712         case packet_format_1:
 713                 /* this is for the CY7C64013... */
 714                 offset = 2;
 715                 port->interrupt_out_buffer[0] = priv->line_control;
 716                 break;
 717         case packet_format_2:
 718                 /* this is for the CY7C63743... */
 719                 offset = 1;
 720                 port->interrupt_out_buffer[0] = priv->line_control;
 721                 break;
 722         }
 723
 724         if (priv->line_control & CONTROL_RESET)
 725                 priv->line_control &= ~CONTROL_RESET;
 726
 727         if (priv->cmd_ctrl) {
 728                 priv->cmd_count++;
 729                 dev_dbg(dev, "%s - line control command being issued\n", __func__);
 730                 spin_unlock_irqrestore(&priv->lock, flags);
 731                 goto send;
 732         } else
 733                 spin_unlock_irqrestore(&priv->lock, flags);
 734
 735         count = kfifo_out_locked(&priv->write_fifo,
 736                                         &port->interrupt_out_buffer[offset],
 737                                         port->interrupt_out_size - offset,
 738                                         &priv->lock);
 739         if (count == 0)
 740                 return;
 741
 742         switch (priv->pkt_fmt) {
 743         default:
 744         case packet_format_1:
 745                 port->interrupt_out_buffer[1] = count;
 746                 break;
 747         case packet_format_2:
 748                 port->interrupt_out_buffer[0] |= count;
 749         }
 750
 751         dev_dbg(dev, "%s - count is %d\n", __func__, count);
 752
 753 send:
 754         spin_lock_irqsave(&priv->lock, flags);
 755         priv->write_urb_in_use = 1;
 756         spin_unlock_irqrestore(&priv->lock, flags);
 757
 758         if (priv->cmd_ctrl)
 759                 actual_size = 1;
 760         else
 761                 actual_size = count +
 762                               (priv->pkt_fmt == packet_format_1 ? 2 : 1);
 763
 764         usb_serial_debug_data(dev, __func__, port->interrupt_out_size,
 765                               port->interrupt_out_urb->transfer_buffer);
 766
 767         usb_fill_int_urb(port->interrupt_out_urb, port->serial->dev,
 768                 usb_sndintpipe(port->serial->dev, port->interrupt_out_endpointAddress),
 769                 port->interrupt_out_buffer, port->interrupt_out_size,
 770                 cypress_write_int_callback, port, priv->write_urb_interval);
 771         result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC);
 772         if (result) {
 773                 dev_err_console(port,
 774                                 "%s - failed submitting write urb, error %d\n",
 775                                                         __func__, result);
 776                 priv->write_urb_in_use = 0;
 777                 cypress_set_dead(port);
 778         }
 779
 780         spin_lock_irqsave(&priv->lock, flags);
 781         if (priv->cmd_ctrl)
 782                 priv->cmd_ctrl = 0;
 783
 784         /* do not count the line control and size bytes */
 785         priv->bytes_out += count;
 786         spin_unlock_irqrestore(&priv->lock, flags);
 787
 788         usb_serial_port_softint(port);
 789 } /* cypress_send */
 790
 791
 792 /* returns how much space is available in the soft buffer */
 793 static int cypress_write_room(struct tty_struct *tty)
 794 {
 795         struct usb_serial_port *port = tty->driver_data;
 796         struct cypress_private *priv = usb_get_serial_port_data(port);
 797         int room = 0;
 798         unsigned long flags;
 799
 800         spin_lock_irqsave(&priv->lock, flags);
 801         room = kfifo_avail(&priv->write_fifo);
 802         spin_unlock_irqrestore(&priv->lock, flags);
 803
 804         dev_dbg(&port->dev, "%s - returns %d\n", __func__, room);
 805         return room;
 806 }
 807
 808
 809 static int cypress_tiocmget(struct tty_struct *tty)
 810 {
 811         struct usb_serial_port *port = tty->driver_data;
 812         struct cypress_private *priv = usb_get_serial_port_data(port);
 813         __u8 status, control;
 814         unsigned int result = 0;
 815         unsigned long flags;
 816
 817         spin_lock_irqsave(&priv->lock, flags);
 818         control = priv->line_control;
 819         status = priv->current_status;
 820         spin_unlock_irqrestore(&priv->lock, flags);
 821
 822         result = ((control & CONTROL_DTR)        ? TIOCM_DTR : 0)
 823                 | ((control & CONTROL_RTS)       ? TIOCM_RTS : 0)
 824                 | ((status & UART_CTS)        ? TIOCM_CTS : 0)
 825                 | ((status & UART_DSR)        ? TIOCM_DSR : 0)
 826                 | ((status & UART_RI)         ? TIOCM_RI  : 0)
 827                 | ((status & UART_CD)         ? TIOCM_CD  : 0);
 828
 829         dev_dbg(&port->dev, "%s - result = %x\n", __func__, result);
 830
 831         return result;
 832 }
 833
 834
 835 static int cypress_tiocmset(struct tty_struct *tty,
 836                                unsigned int set, unsigned int clear)
 837 {
 838         struct usb_serial_port *port = tty->driver_data;
 839         struct cypress_private *priv = usb_get_serial_port_data(port);
 840         unsigned long flags;
 841
 842         spin_lock_irqsave(&priv->lock, flags);
 843         if (set & TIOCM_RTS)
 844                 priv->line_control |= CONTROL_RTS;
 845         if (set & TIOCM_DTR)
 846                 priv->line_control |= CONTROL_DTR;
 847         if (clear & TIOCM_RTS)
 848                 priv->line_control &= ~CONTROL_RTS;
 849         if (clear & TIOCM_DTR)
 850                 priv->line_control &= ~CONTROL_DTR;
 851         priv->cmd_ctrl = 1;
 852         spin_unlock_irqrestore(&priv->lock, flags);
 853
 854         return cypress_write(tty, port, NULL, 0);
 855 }
 856
 857
 858 static int cypress_ioctl(struct tty_struct *tty,
 859                                         unsigned int cmd, unsigned long arg)
 860 {
 861         struct usb_serial_port *port = tty->driver_data;
 862         struct cypress_private *priv = usb_get_serial_port_data(port);
 863
 864         dev_dbg(&port->dev, "%s - port %d, cmd 0x%.4x\n", __func__, port->number, cmd);
 865
 866         switch (cmd) {
 867         /* This code comes from drivers/char/serial.c and ftdi_sio.c */
 868         case TIOCMIWAIT:
 869                 for (;;) {
 870                         interruptible_sleep_on(&port->delta_msr_wait);
 871                         /* see if a signal did it */
 872                         if (signal_pending(current))
 873                                 return -ERESTARTSYS;
 874
 875                         if (port->serial->disconnected)
 876                                 return -EIO;
 877
 878                         {
 879                                 char diff = priv->diff_status;
 880                                 if (diff == 0)
 881                                         return -EIO; /* no change => error */
 882
 883                                 /* consume all events */
 884                                 priv->diff_status = 0;
 885
 886                                 /* return 0 if caller wanted to know about
 887                                    these bits */
 888                                 if (((arg & TIOCM_RNG) && (diff & UART_RI)) ||
 889                                     ((arg & TIOCM_DSR) && (diff & UART_DSR)) ||
 890                                     ((arg & TIOCM_CD) && (diff & UART_CD)) ||
 891                                     ((arg & TIOCM_CTS) && (diff & UART_CTS)))
 892                                         return 0;
 893                                 /* otherwise caller can't care less about what
 894                                  * happened, and so we continue to wait for
 895                                  * more events.
 896                                  */
 897                         }
 898                 }
 899                 return 0;
 900         default:
 901                 break;
 902         }
 903         dev_dbg(&port->dev, "%s - arg not supported - it was 0x%04x - check include/asm/ioctls.h\n", __func__, cmd);
 904         return -ENOIOCTLCMD;
 905 } /* cypress_ioctl */
 906
 907
 908 static void cypress_set_termios(struct tty_struct *tty,
 909         struct usb_serial_port *port, struct ktermios *old_termios)
 910 {
 911         struct cypress_private *priv = usb_get_serial_port_data(port);
 912         struct device *dev = &port->dev;
 913         int data_bits, stop_bits, parity_type, parity_enable;
 914         unsigned cflag, iflag;
 915         unsigned long flags;
 916         __u8 oldlines;
 917         int linechange = 0;
 918
 919         spin_lock_irqsave(&priv->lock, flags);
 920         /* We can't clean this one up as we don't know the device type
 921            early enough */
 922         if (!priv->termios_initialized) {
 923                 if (priv->chiptype == CT_EARTHMATE) {
 924                         tty->termios = tty_std_termios;
 925                         tty->termios.c_cflag = B4800 | CS8 | CREAD | HUPCL |
 926                                 CLOCAL;
 927                         tty->termios.c_ispeed = 4800;
 928                         tty->termios.c_ospeed = 4800;
 929                 } else if (priv->chiptype == CT_CYPHIDCOM) {
 930                         tty->termios = tty_std_termios;
 931                         tty->termios.c_cflag = B9600 | CS8 | CREAD | HUPCL |
 932                                 CLOCAL;
 933                         tty->termios.c_ispeed = 9600;
 934                         tty->termios.c_ospeed = 9600;
 935                 } else if (priv->chiptype == CT_CA42V2) {
 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                 }
 942                 priv->termios_initialized = 1;
 943         }
 944         spin_unlock_irqrestore(&priv->lock, flags);
 945
 946         /* Unsupported features need clearing */
 947         tty->termios.c_cflag &= ~(CMSPAR|CRTSCTS);
 948
 949         cflag = tty->termios.c_cflag;
 950         iflag = tty->termios.c_iflag;
 951
 952         /* check if there are new settings */
 953         if (old_termios) {
 954                 spin_lock_irqsave(&priv->lock, flags);
 955                 priv->tmp_termios = tty->termios;
 956                 spin_unlock_irqrestore(&priv->lock, flags);
 957         }
 958
 959         /* set number of data bits, parity, stop bits */
 960         /* when parity is disabled the parity type bit is ignored */
 961
 962         /* 1 means 2 stop bits, 0 means 1 stop bit */
 963         stop_bits = cflag & CSTOPB ? 1 : 0;
 964
 965         if (cflag & PARENB) {
 966                 parity_enable = 1;
 967                 /* 1 means odd parity, 0 means even parity */
 968                 parity_type = cflag & PARODD ? 1 : 0;
 969         } else
 970                 parity_enable = parity_type = 0;
 971
 972         switch (cflag & CSIZE) {
 973         case CS5:
 974                 data_bits = 0;
 975                 break;
 976         case CS6:
 977                 data_bits = 1;
 978                 break;
 979         case CS7:
 980                 data_bits = 2;
 981                 break;
 982         case CS8:
 983                 data_bits = 3;
 984                 break;
 985         default:
 986                 dev_err(dev, "%s - CSIZE was set, but not CS5-CS8\n", __func__);
 987                 data_bits = 3;
 988         }
 989         spin_lock_irqsave(&priv->lock, flags);
 990         oldlines = priv->line_control;
 991         if ((cflag & CBAUD) == B0) {
 992                 /* drop dtr and rts */
 993                 dev_dbg(dev, "%s - dropping the lines, baud rate 0bps\n", __func__);
 994                 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
 995         } else
 996                 priv->line_control = (CONTROL_DTR | CONTROL_RTS);
 997         spin_unlock_irqrestore(&priv->lock, flags);
 998
 999         dev_dbg(dev, "%s - sending %d stop_bits, %d parity_enable, %d parity_type, %d data_bits (+5)\n",
1000                 __func__, stop_bits, parity_enable, parity_type, data_bits);
1001
1002         cypress_serial_control(tty, port, tty_get_baud_rate(tty),
1003                         data_bits, stop_bits,
1004                         parity_enable, parity_type,
1005                         0, CYPRESS_SET_CONFIG);
1006
1007         /* we perform a CYPRESS_GET_CONFIG so that the current settings are
1008          * filled into the private structure this should confirm that all is
1009          * working if it returns what we just set */
1010         cypress_serial_control(tty, port, 0, 0, 0, 0, 0, 0, CYPRESS_GET_CONFIG);
1011
1012         /* Here we can define custom tty settings for devices; the main tty
1013          * termios flag base comes from empeg.c */
1014
1015         spin_lock_irqsave(&priv->lock, flags);
1016         if (priv->chiptype == CT_EARTHMATE && priv->baud_rate == 4800) {
1017                 dev_dbg(dev, "Using custom termios settings for a baud rate of 4800bps.\n");
1018                 /* define custom termios settings for NMEA protocol */
1019
1020                 tty->termios.c_iflag /* input modes - */
1021                         &= ~(IGNBRK  /* disable ignore break */
1022                         | BRKINT     /* disable break causes interrupt */
1023                         | PARMRK     /* disable mark parity errors */
1024                         | ISTRIP     /* disable clear high bit of input char */
1025                         | INLCR      /* disable translate NL to CR */
1026                         | IGNCR      /* disable ignore CR */
1027                         | ICRNL      /* disable translate CR to NL */
1028                         | IXON);     /* disable enable XON/XOFF flow control */
1029
1030                 tty->termios.c_oflag /* output modes */
1031                         &= ~OPOST;    /* disable postprocess output char */
1032
1033                 tty->termios.c_lflag /* line discipline modes */
1034                         &= ~(ECHO     /* disable echo input characters */
1035                         | ECHONL      /* disable echo new line */
1036                         | ICANON      /* disable erase, kill, werase, and rprnt
1037                                          special characters */
1038                         | ISIG        /* disable interrupt, quit, and suspend
1039                                          special characters */
1040                         | IEXTEN);    /* disable non-POSIX special characters */
1041         } /* CT_CYPHIDCOM: Application should handle this for device */
1042
1043         linechange = (priv->line_control != oldlines);
1044         spin_unlock_irqrestore(&priv->lock, flags);
1045
1046         /* if necessary, set lines */
1047         if (linechange) {
1048                 priv->cmd_ctrl = 1;
1049                 cypress_write(tty, port, NULL, 0);
1050         }
1051 } /* cypress_set_termios */
1052
1053
1054 /* returns amount of data still left in soft buffer */
1055 static int cypress_chars_in_buffer(struct tty_struct *tty)
1056 {
1057         struct usb_serial_port *port = tty->driver_data;
1058         struct cypress_private *priv = usb_get_serial_port_data(port);
1059         int chars = 0;
1060         unsigned long flags;
1061
1062         spin_lock_irqsave(&priv->lock, flags);
1063         chars = kfifo_len(&priv->write_fifo);
1064         spin_unlock_irqrestore(&priv->lock, flags);
1065
1066         dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
1067         return chars;
1068 }
1069
1070
1071 static void cypress_throttle(struct tty_struct *tty)
1072 {
1073         struct usb_serial_port *port = tty->driver_data;
1074         struct cypress_private *priv = usb_get_serial_port_data(port);
1075
1076         spin_lock_irq(&priv->lock);
1077         priv->rx_flags = THROTTLED;
1078         spin_unlock_irq(&priv->lock);
1079 }
1080
1081
1082 static void cypress_unthrottle(struct tty_struct *tty)
1083 {
1084         struct usb_serial_port *port = tty->driver_data;
1085         struct cypress_private *priv = usb_get_serial_port_data(port);
1086         int actually_throttled, result;
1087
1088         spin_lock_irq(&priv->lock);
1089         actually_throttled = priv->rx_flags & ACTUALLY_THROTTLED;
1090         priv->rx_flags = 0;
1091         spin_unlock_irq(&priv->lock);
1092
1093         if (!priv->comm_is_ok)
1094                 return;
1095
1096         if (actually_throttled) {
1097                 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
1098                 if (result) {
1099                         dev_err(&port->dev, "%s - failed submitting read urb, "
1100                                         "error %d\n", __func__, result);
1101                         cypress_set_dead(port);
1102                 }
1103         }
1104 }
1105
1106
1107 static void cypress_read_int_callback(struct urb *urb)
1108 {
1109         struct usb_serial_port *port = urb->context;
1110         struct cypress_private *priv = usb_get_serial_port_data(port);
1111         struct device *dev = &urb->dev->dev;
1112         struct tty_struct *tty;
1113         unsigned char *data = urb->transfer_buffer;
1114         unsigned long flags;
1115         char tty_flag = TTY_NORMAL;
1116         int havedata = 0;
1117         int bytes = 0;
1118         int result;
1119         int i = 0;
1120         int status = urb->status;
1121
1122         switch (status) {
1123         case 0: /* success */
1124                 break;
1125         case -ECONNRESET:
1126         case -ENOENT:
1127         case -ESHUTDOWN:
1128                 /* precursor to disconnect so just go away */
1129                 return;
1130         case -EPIPE:
1131                 /* Can't call usb_clear_halt while in_interrupt */
1132                 /* FALLS THROUGH */
1133         default:
1134                 /* something ugly is going on... */
1135                 dev_err(dev, "%s - unexpected nonzero read status received: %d\n",
1136                         __func__, status);
1137                 cypress_set_dead(port);
1138                 return;
1139         }
1140
1141         spin_lock_irqsave(&priv->lock, flags);
1142         if (priv->rx_flags & THROTTLED) {
1143                 dev_dbg(dev, "%s - now throttling\n", __func__);
1144                 priv->rx_flags |= ACTUALLY_THROTTLED;
1145                 spin_unlock_irqrestore(&priv->lock, flags);
1146                 return;
1147         }
1148         spin_unlock_irqrestore(&priv->lock, flags);
1149
1150         tty = tty_port_tty_get(&port->port);
1151         if (!tty) {
1152                 dev_dbg(dev, "%s - bad tty pointer - exiting\n", __func__);
1153                 return;
1154         }
1155
1156         spin_lock_irqsave(&priv->lock, flags);
1157         result = urb->actual_length;
1158         switch (priv->pkt_fmt) {
1159         default:
1160         case packet_format_1:
1161                 /* This is for the CY7C64013... */
1162                 priv->current_status = data[0] & 0xF8;
1163                 bytes = data[1] + 2;
1164                 i = 2;
1165                 if (bytes > 2)
1166                         havedata = 1;
1167                 break;
1168         case packet_format_2:
1169                 /* This is for the CY7C63743... */
1170                 priv->current_status = data[0] & 0xF8;
1171                 bytes = (data[0] & 0x07) + 1;
1172                 i = 1;
1173                 if (bytes > 1)
1174                         havedata = 1;
1175                 break;
1176         }
1177         spin_unlock_irqrestore(&priv->lock, flags);
1178         if (result < bytes) {
1179                 dev_dbg(dev,
1180                         "%s - wrong packet size - received %d bytes but packet said %d bytes\n",
1181                         __func__, result, bytes);
1182                 goto continue_read;
1183         }
1184
1185         usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
1186
1187         spin_lock_irqsave(&priv->lock, flags);
1188         /* check to see if status has changed */
1189         if (priv->current_status != priv->prev_status) {
1190                 priv->diff_status |= priv->current_status ^
1191                         priv->prev_status;
1192                 wake_up_interruptible(&port->delta_msr_wait);
1193                 priv->prev_status = priv->current_status;
1194         }
1195         spin_unlock_irqrestore(&priv->lock, flags);
1196
1197         /* hangup, as defined in acm.c... this might be a bad place for it
1198          * though */
1199         if (tty && !(tty->termios.c_cflag & CLOCAL) &&
1200                         !(priv->current_status & UART_CD)) {
1201                 dev_dbg(dev, "%s - calling hangup\n", __func__);
1202                 tty_hangup(tty);
1203                 goto continue_read;
1204         }
1205
1206         /* There is one error bit... I'm assuming it is a parity error
1207          * indicator as the generic firmware will set this bit to 1 if a
1208          * parity error occurs.
1209          * I can not find reference to any other error events. */
1210         spin_lock_irqsave(&priv->lock, flags);
1211         if (priv->current_status & CYP_ERROR) {
1212                 spin_unlock_irqrestore(&priv->lock, flags);
1213                 tty_flag = TTY_PARITY;
1214                 dev_dbg(dev, "%s - Parity Error detected\n", __func__);
1215         } else
1216                 spin_unlock_irqrestore(&priv->lock, flags);
1217
1218         /* process read if there is data other than line status */
1219         if (bytes > i) {
1220                 tty_insert_flip_string_fixed_flag(&port->port, data + i,
1221                                 tty_flag, bytes - i);
1222                 tty_flip_buffer_push(&port->port);
1223         }
1224
1225         spin_lock_irqsave(&priv->lock, flags);
1226         /* control and status byte(s) are also counted */
1227         priv->bytes_in += bytes;
1228         spin_unlock_irqrestore(&priv->lock, flags);
1229
1230 continue_read:
1231         tty_kref_put(tty);
1232
1233         /* Continue trying to always read */
1234
1235         if (priv->comm_is_ok) {
1236                 usb_fill_int_urb(port->interrupt_in_urb, port->serial->dev,
1237                                 usb_rcvintpipe(port->serial->dev,
1238                                         port->interrupt_in_endpointAddress),
1239                                 port->interrupt_in_urb->transfer_buffer,
1240                                 port->interrupt_in_urb->transfer_buffer_length,
1241                                 cypress_read_int_callback, port,
1242                                 priv->read_urb_interval);
1243                 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
1244                 if (result && result != -EPERM) {
1245                         dev_err(dev, "%s - failed resubmitting read urb, error %d\n",
1246                                 __func__, result);
1247                         cypress_set_dead(port);
1248                 }
1249         }
1250 } /* cypress_read_int_callback */
1251
1252
1253 static void cypress_write_int_callback(struct urb *urb)
1254 {
1255         struct usb_serial_port *port = urb->context;
1256         struct cypress_private *priv = usb_get_serial_port_data(port);
1257         struct device *dev = &urb->dev->dev;
1258         int result;
1259         int status = urb->status;
1260
1261         switch (status) {
1262         case 0:
1263                 /* success */
1264                 break;
1265         case -ECONNRESET:
1266         case -ENOENT:
1267         case -ESHUTDOWN:
1268                 /* this urb is terminated, clean up */
1269                 dev_dbg(dev, "%s - urb shutting down with status: %d\n",
1270                         __func__, status);
1271                 priv->write_urb_in_use = 0;
1272                 return;
1273         case -EPIPE: /* no break needed; clear halt and resubmit */
1274                 if (!priv->comm_is_ok)
1275                         break;
1276                 usb_clear_halt(port->serial->dev, 0x02);
1277                 /* error in the urb, so we have to resubmit it */
1278                 dev_dbg(dev, "%s - nonzero write bulk status received: %d\n",
1279                         __func__, status);
1280                 port->interrupt_out_urb->transfer_buffer_length = 1;
1281                 result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC);
1282                 if (!result)
1283                         return;
1284                 dev_err(dev, "%s - failed resubmitting write urb, error %d\n",
1285                         __func__, result);
1286                 cypress_set_dead(port);
1287                 break;
1288         default:
1289                 dev_err(dev, "%s - unexpected nonzero write status received: %d\n",
1290                         __func__, status);
1291                 cypress_set_dead(port);
1292                 break;
1293         }
1294         priv->write_urb_in_use = 0;
1295
1296         /* send any buffered data */
1297         cypress_send(port);
1298 }
1299
1300 module_usb_serial_driver(serial_drivers, id_table_combined);
1301
1302 MODULE_AUTHOR(DRIVER_AUTHOR);
1303 MODULE_DESCRIPTION(DRIVER_DESC);
1304 MODULE_LICENSE("GPL");
1305
1306 module_param(stats, bool, S_IRUGO | S_IWUSR);
1307 MODULE_PARM_DESC(stats, "Enable statistics or not");
1308 module_param(interval, int, S_IRUGO | S_IWUSR);
1309 MODULE_PARM_DESC(interval, "Overrides interrupt interval");
1310 module_param(unstable_bauds, bool, S_IRUGO | S_IWUSR);
1311 MODULE_PARM_DESC(unstable_bauds, "Allow unstable baud rates");