Pileus Git - ~andy/linux/blob - 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         .probe =        usb_serial_probe,
  95         .disconnect =   usb_serial_disconnect,
  96         .id_table =     id_table_combined,
  97 };
  98
  99 enum packet_format {
 100         packet_format_1,  /* b0:status, b1:payload count */
 101         packet_format_2   /* b0[7:3]:status, b0[2:0]:payload count */
 102 };
 103
 104 struct cypress_private {
 105         spinlock_t lock;                   /* private lock */
 106         int chiptype;                      /* identifier of device, for quirks/etc */
 107         int bytes_in;                      /* used for statistics */
 108         int bytes_out;                     /* used for statistics */
 109         int cmd_count;                     /* used for statistics */
 110         int cmd_ctrl;                      /* always set this to 1 before issuing a command */
 111         struct kfifo write_fifo;           /* write fifo */
 112         int write_urb_in_use;              /* write urb in use indicator */
 113         int write_urb_interval;            /* interval to use for write urb */
 114         int read_urb_interval;             /* interval to use for read urb */
 115         int comm_is_ok;                    /* true if communication is (still) ok */
 116         int termios_initialized;
 117         __u8 line_control;                 /* holds dtr / rts value */
 118         __u8 current_status;               /* received from last read - info on dsr,cts,cd,ri,etc */
 119         __u8 current_config;               /* stores the current configuration byte */
 120         __u8 rx_flags;                     /* throttling - used from whiteheat/ftdi_sio */
 121         enum packet_format pkt_fmt;        /* format to use for packet send / receive */
 122         int get_cfg_unsafe;                /* If true, the CYPRESS_GET_CONFIG is unsafe */
 123         int baud_rate;                     /* stores current baud rate in
 124                                               integer form */
 125         int isthrottled;                   /* if throttled, discard reads */
 126         wait_queue_head_t delta_msr_wait;  /* used for TIOCMIWAIT */
 127         char prev_status, diff_status;     /* used for TIOCMIWAIT */
 128         /* we pass a pointer to this as the argument sent to
 129            cypress_set_termios old_termios */
 130         struct ktermios tmp_termios;       /* stores the old termios settings */
 131 };
 132
 133 /* function prototypes for the Cypress USB to serial device */
 134 static int  cypress_earthmate_startup(struct usb_serial *serial);
 135 static int  cypress_hidcom_startup(struct usb_serial *serial);
 136 static int  cypress_ca42v2_startup(struct usb_serial *serial);
 137 static void cypress_release(struct usb_serial *serial);
 138 static int  cypress_open(struct tty_struct *tty, struct usb_serial_port *port);
 139 static void cypress_close(struct usb_serial_port *port);
 140 static void cypress_dtr_rts(struct usb_serial_port *port, int on);
 141 static int  cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
 142                         const unsigned char *buf, int count);
 143 static void cypress_send(struct usb_serial_port *port);
 144 static int  cypress_write_room(struct tty_struct *tty);
 145 static int  cypress_ioctl(struct tty_struct *tty,
 146                         unsigned int cmd, unsigned long arg);
 147 static void cypress_set_termios(struct tty_struct *tty,
 148                         struct usb_serial_port *port, struct ktermios *old);
 149 static int  cypress_tiocmget(struct tty_struct *tty);
 150 static int  cypress_tiocmset(struct tty_struct *tty,
 151                         unsigned int set, unsigned int clear);
 152 static int  cypress_chars_in_buffer(struct tty_struct *tty);
 153 static void cypress_throttle(struct tty_struct *tty);
 154 static void cypress_unthrottle(struct tty_struct *tty);
 155 static void cypress_set_dead(struct usb_serial_port *port);
 156 static void cypress_read_int_callback(struct urb *urb);
 157 static void cypress_write_int_callback(struct urb *urb);
 158
 159 static struct usb_serial_driver cypress_earthmate_device = {
 160         .driver = {
 161                 .owner =                THIS_MODULE,
 162                 .name =                 "earthmate",
 163         },
 164         .description =                  "DeLorme Earthmate USB",
 165         .id_table =                     id_table_earthmate,
 166         .num_ports =                    1,
 167         .attach =                       cypress_earthmate_startup,
 168         .release =                      cypress_release,
 169         .open =                         cypress_open,
 170         .close =                        cypress_close,
 171         .dtr_rts =                      cypress_dtr_rts,
 172         .write =                        cypress_write,
 173         .write_room =                   cypress_write_room,
 174         .ioctl =                        cypress_ioctl,
 175         .set_termios =                  cypress_set_termios,
 176         .tiocmget =                     cypress_tiocmget,
 177         .tiocmset =                     cypress_tiocmset,
 178         .chars_in_buffer =              cypress_chars_in_buffer,
 179         .throttle =                     cypress_throttle,
 180         .unthrottle =                   cypress_unthrottle,
 181         .read_int_callback =            cypress_read_int_callback,
 182         .write_int_callback =           cypress_write_int_callback,
 183 };
 184
 185 static struct usb_serial_driver cypress_hidcom_device = {
 186         .driver = {
 187                 .owner =                THIS_MODULE,
 188                 .name =                 "cyphidcom",
 189         },
 190         .description =                  "HID->COM RS232 Adapter",
 191         .id_table =                     id_table_cyphidcomrs232,
 192         .num_ports =                    1,
 193         .attach =                       cypress_hidcom_startup,
 194         .release =                      cypress_release,
 195         .open =                         cypress_open,
 196         .close =                        cypress_close,
 197         .dtr_rts =                      cypress_dtr_rts,
 198         .write =                        cypress_write,
 199         .write_room =                   cypress_write_room,
 200         .ioctl =                        cypress_ioctl,
 201         .set_termios =                  cypress_set_termios,
 202         .tiocmget =                     cypress_tiocmget,
 203         .tiocmset =                     cypress_tiocmset,
 204         .chars_in_buffer =              cypress_chars_in_buffer,
 205         .throttle =                     cypress_throttle,
 206         .unthrottle =                   cypress_unthrottle,
 207         .read_int_callback =            cypress_read_int_callback,
 208         .write_int_callback =           cypress_write_int_callback,
 209 };
 210
 211 static struct usb_serial_driver cypress_ca42v2_device = {
 212         .driver = {
 213                 .owner =                THIS_MODULE,
 214                 .name =                 "nokiaca42v2",
 215         },
 216         .description =                  "Nokia CA-42 V2 Adapter",
 217         .id_table =                     id_table_nokiaca42v2,
 218         .num_ports =                    1,
 219         .attach =                       cypress_ca42v2_startup,
 220         .release =                      cypress_release,
 221         .open =                         cypress_open,
 222         .close =                        cypress_close,
 223         .dtr_rts =                      cypress_dtr_rts,
 224         .write =                        cypress_write,
 225         .write_room =                   cypress_write_room,
 226         .ioctl =                        cypress_ioctl,
 227         .set_termios =                  cypress_set_termios,
 228         .tiocmget =                     cypress_tiocmget,
 229         .tiocmset =                     cypress_tiocmset,
 230         .chars_in_buffer =              cypress_chars_in_buffer,
 231         .throttle =                     cypress_throttle,
 232         .unthrottle =                   cypress_unthrottle,
 233         .read_int_callback =            cypress_read_int_callback,
 234         .write_int_callback =           cypress_write_int_callback,
 235 };
 236
 237 static struct usb_serial_driver * const serial_drivers[] = {
 238         &cypress_earthmate_device, &cypress_hidcom_device,
 239         &cypress_ca42v2_device, NULL
 240 };
 241
 242 /*****************************************************************************
 243  * Cypress serial helper functions
 244  *****************************************************************************/
 245
 246
 247 static int analyze_baud_rate(struct usb_serial_port *port, speed_t new_rate)
 248 {
 249         struct cypress_private *priv;
 250         priv = usb_get_serial_port_data(port);
 251
 252         if (unstable_bauds)
 253                 return new_rate;
 254
 255         /*
 256          * The general purpose firmware for the Cypress M8 allows for
 257          * a maximum speed of 57600bps (I have no idea whether DeLorme
 258          * chose to use the general purpose firmware or not), if you
 259          * need to modify this speed setting for your own project
 260          * please add your own chiptype and modify the code likewise.
 261          * The Cypress HID->COM device will work successfully up to
 262          * 115200bps (but the actual throughput is around 3kBps).
 263          */
 264         if (port->serial->dev->speed == USB_SPEED_LOW) {
 265                 /*
 266                  * Mike Isely <isely@pobox.com> 2-Feb-2008: The
 267                  * Cypress app note that describes this mechanism
 268                  * states the the low-speed part can't handle more
 269                  * than 800 bytes/sec, in which case 4800 baud is the
 270                  * safest speed for a part like that.
 271                  */
 272                 if (new_rate > 4800) {
 273                         dbg("%s - failed setting baud rate, device incapable "
 274                             "speed %d", __func__, new_rate);
 275                         return -1;
 276                 }
 277         }
 278         switch (priv->chiptype) {
 279         case CT_EARTHMATE:
 280                 if (new_rate <= 600) {
 281                         /* 300 and 600 baud rates are supported under
 282                          * the generic firmware, but are not used with
 283                          * NMEA and SiRF protocols */
 284                         dbg("%s - failed setting baud rate, unsupported speed "
 285                             "of %d on Earthmate GPS", __func__, new_rate);
 286                         return -1;
 287                 }
 288                 break;
 289         default:
 290                 break;
 291         }
 292         return new_rate;
 293 }
 294
 295
 296 /* This function can either set or retrieve the current serial line settings */
 297 static int cypress_serial_control(struct tty_struct *tty,
 298         struct usb_serial_port *port, speed_t baud_rate, int data_bits,
 299         int stop_bits, int parity_enable, int parity_type, int reset,
 300         int cypress_request_type)
 301 {
 302         int new_baudrate = 0, retval = 0, tries = 0;
 303         struct cypress_private *priv;
 304         u8 *feature_buffer;
 305         const unsigned int feature_len = 5;
 306         unsigned long flags;
 307
 308         dbg("%s", __func__);
 309
 310         priv = usb_get_serial_port_data(port);
 311
 312         if (!priv->comm_is_ok)
 313                 return -ENODEV;
 314
 315         feature_buffer = kcalloc(feature_len, sizeof(u8), GFP_KERNEL);
 316         if (!feature_buffer)
 317                 return -ENOMEM;
 318
 319         switch (cypress_request_type) {
 320         case CYPRESS_SET_CONFIG:
 321                 /* 0 means 'Hang up' so doesn't change the true bit rate */
 322                 new_baudrate = priv->baud_rate;
 323                 if (baud_rate && baud_rate != priv->baud_rate) {
 324                         dbg("%s - baud rate is changing", __func__);
 325                         retval = analyze_baud_rate(port, baud_rate);
 326                         if (retval >= 0) {
 327                                 new_baudrate = retval;
 328                                 dbg("%s - New baud rate set to %d",
 329                                     __func__, new_baudrate);
 330                         }
 331                 }
 332                 dbg("%s - baud rate is being sent as %d",
 333                                         __func__, new_baudrate);
 334
 335                 /* fill the feature_buffer with new configuration */
 336                 put_unaligned_le32(new_baudrate, feature_buffer);
 337                 feature_buffer[4] |= data_bits;   /* assign data bits in 2 bit space ( max 3 ) */
 338                 /* 1 bit gap */
 339                 feature_buffer[4] |= (stop_bits << 3);   /* assign stop bits in 1 bit space */
 340                 feature_buffer[4] |= (parity_enable << 4);   /* assign parity flag in 1 bit space */
 341                 feature_buffer[4] |= (parity_type << 5);   /* assign parity type in 1 bit space */
 342                 /* 1 bit gap */
 343                 feature_buffer[4] |= (reset << 7);   /* assign reset at end of byte, 1 bit space */
 344
 345                 dbg("%s - device is being sent this feature report:",
 346                                                                 __func__);
 347                 dbg("%s - %02X - %02X - %02X - %02X - %02X", __func__,
 348                         feature_buffer[0], feature_buffer[1],
 349                         feature_buffer[2], feature_buffer[3],
 350                         feature_buffer[4]);
 351
 352                 do {
 353                         retval = usb_control_msg(port->serial->dev,
 354                                         usb_sndctrlpipe(port->serial->dev, 0),
 355                                         HID_REQ_SET_REPORT,
 356                                         USB_DIR_OUT | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
 357                                         0x0300, 0, feature_buffer,
 358                                         feature_len, 500);
 359
 360                         if (tries++ >= 3)
 361                                 break;
 362
 363                 } while (retval != feature_len &&
 364                          retval != -ENODEV);
 365
 366                 if (retval != feature_len) {
 367                         dev_err(&port->dev, "%s - failed sending serial "
 368                                 "line settings - %d\n", __func__, retval);
 369                         cypress_set_dead(port);
 370                 } else {
 371                         spin_lock_irqsave(&priv->lock, flags);
 372                         priv->baud_rate = new_baudrate;
 373                         priv->current_config = feature_buffer[4];
 374                         spin_unlock_irqrestore(&priv->lock, flags);
 375                         /* If we asked for a speed change encode it */
 376                         if (baud_rate)
 377                                 tty_encode_baud_rate(tty,
 378                                         new_baudrate, new_baudrate);
 379                 }
 380         break;
 381         case CYPRESS_GET_CONFIG:
 382                 if (priv->get_cfg_unsafe) {
 383                         /* Not implemented for this device,
 384                            and if we try to do it we're likely
 385                            to crash the hardware. */
 386                         retval = -ENOTTY;
 387                         goto out;
 388                 }
 389                 dbg("%s - retreiving serial line settings", __func__);
 390                 do {
 391                         retval = usb_control_msg(port->serial->dev,
 392                                         usb_rcvctrlpipe(port->serial->dev, 0),
 393                                         HID_REQ_GET_REPORT,
 394                                         USB_DIR_IN | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
 395                                         0x0300, 0, feature_buffer,
 396                                         feature_len, 500);
 397
 398                         if (tries++ >= 3)
 399                                 break;
 400                 } while (retval != feature_len
 401                                                 && retval != -ENODEV);
 402
 403                 if (retval != feature_len) {
 404                         dev_err(&port->dev, "%s - failed to retrieve serial "
 405                                 "line settings - %d\n", __func__, retval);
 406                         cypress_set_dead(port);
 407                         goto out;
 408                 } else {
 409                         spin_lock_irqsave(&priv->lock, flags);
 410                         /* store the config in one byte, and later
 411                            use bit masks to check values */
 412                         priv->current_config = feature_buffer[4];
 413                         priv->baud_rate = get_unaligned_le32(feature_buffer);
 414                         spin_unlock_irqrestore(&priv->lock, flags);
 415                 }
 416         }
 417         spin_lock_irqsave(&priv->lock, flags);
 418         ++priv->cmd_count;
 419         spin_unlock_irqrestore(&priv->lock, flags);
 420 out:
 421         kfree(feature_buffer);
 422         return retval;
 423 } /* cypress_serial_control */
 424
 425
 426 static void cypress_set_dead(struct usb_serial_port *port)
 427 {
 428         struct cypress_private *priv = usb_get_serial_port_data(port);
 429         unsigned long flags;
 430
 431         spin_lock_irqsave(&priv->lock, flags);
 432         if (!priv->comm_is_ok) {
 433                 spin_unlock_irqrestore(&priv->lock, flags);
 434                 return;
 435         }
 436         priv->comm_is_ok = 0;
 437         spin_unlock_irqrestore(&priv->lock, flags);
 438
 439         dev_err(&port->dev, "cypress_m8 suspending failing port %d - "
 440                 "interval might be too short\n", port->number);
 441 }
 442
 443
 444 /*****************************************************************************
 445  * Cypress serial driver functions
 446  *****************************************************************************/
 447
 448
 449 static int generic_startup(struct usb_serial *serial)
 450 {
 451         struct cypress_private *priv;
 452         struct usb_serial_port *port = serial->port[0];
 453
 454         dbg("%s - port %d", __func__, port->number);
 455
 456         priv = kzalloc(sizeof(struct cypress_private), GFP_KERNEL);
 457         if (!priv)
 458                 return -ENOMEM;
 459
 460         priv->comm_is_ok = !0;
 461         spin_lock_init(&priv->lock);
 462         if (kfifo_alloc(&priv->write_fifo, CYPRESS_BUF_SIZE, GFP_KERNEL)) {
 463                 kfree(priv);
 464                 return -ENOMEM;
 465         }
 466         init_waitqueue_head(&priv->delta_msr_wait);
 467
 468         usb_reset_configuration(serial->dev);
 469
 470         priv->cmd_ctrl = 0;
 471         priv->line_control = 0;
 472         priv->termios_initialized = 0;
 473         priv->rx_flags = 0;
 474         /* Default packet format setting is determined by packet size.
 475            Anything with a size larger then 9 must have a separate
 476            count field since the 3 bit count field is otherwise too
 477            small.  Otherwise we can use the slightly more compact
 478            format.  This is in accordance with the cypress_m8 serial
 479            converter app note. */
 480         if (port->interrupt_out_size > 9)
 481                 priv->pkt_fmt = packet_format_1;
 482         else
 483                 priv->pkt_fmt = packet_format_2;
 484
 485         if (interval > 0) {
 486                 priv->write_urb_interval = interval;
 487                 priv->read_urb_interval = interval;
 488                 dbg("%s - port %d read & write intervals forced to %d",
 489                     __func__, port->number, interval);
 490         } else {
 491                 priv->write_urb_interval = port->interrupt_out_urb->interval;
 492                 priv->read_urb_interval = port->interrupt_in_urb->interval;
 493                 dbg("%s - port %d intervals: read=%d write=%d",
 494                     __func__, port->number,
 495                     priv->read_urb_interval, priv->write_urb_interval);
 496         }
 497         usb_set_serial_port_data(port, priv);
 498
 499         return 0;
 500 }
 501
 502
 503 static int cypress_earthmate_startup(struct usb_serial *serial)
 504 {
 505         struct cypress_private *priv;
 506         struct usb_serial_port *port = serial->port[0];
 507
 508         dbg("%s", __func__);
 509
 510         if (generic_startup(serial)) {
 511                 dbg("%s - Failed setting up port %d", __func__,
 512                                 port->number);
 513                 return 1;
 514         }
 515
 516         priv = usb_get_serial_port_data(port);
 517         priv->chiptype = CT_EARTHMATE;
 518         /* All Earthmate devices use the separated-count packet
 519            format!  Idiotic. */
 520         priv->pkt_fmt = packet_format_1;
 521         if (serial->dev->descriptor.idProduct !=
 522                                 cpu_to_le16(PRODUCT_ID_EARTHMATEUSB)) {
 523                 /* The old original USB Earthmate seemed able to
 524                    handle GET_CONFIG requests; everything they've
 525                    produced since that time crashes if this command is
 526                    attempted :-( */
 527                 dbg("%s - Marking this device as unsafe for GET_CONFIG "
 528                     "commands", __func__);
 529                 priv->get_cfg_unsafe = !0;
 530         }
 531
 532         return 0;
 533 } /* cypress_earthmate_startup */
 534
 535
 536 static int cypress_hidcom_startup(struct usb_serial *serial)
 537 {
 538         struct cypress_private *priv;
 539
 540         dbg("%s", __func__);
 541
 542         if (generic_startup(serial)) {
 543                 dbg("%s - Failed setting up port %d", __func__,
 544                                 serial->port[0]->number);
 545                 return 1;
 546         }
 547
 548         priv = usb_get_serial_port_data(serial->port[0]);
 549         priv->chiptype = CT_CYPHIDCOM;
 550
 551         return 0;
 552 } /* cypress_hidcom_startup */
 553
 554
 555 static int cypress_ca42v2_startup(struct usb_serial *serial)
 556 {
 557         struct cypress_private *priv;
 558
 559         dbg("%s", __func__);
 560
 561         if (generic_startup(serial)) {
 562                 dbg("%s - Failed setting up port %d", __func__,
 563                                 serial->port[0]->number);
 564                 return 1;
 565         }
 566
 567         priv = usb_get_serial_port_data(serial->port[0]);
 568         priv->chiptype = CT_CA42V2;
 569
 570         return 0;
 571 } /* cypress_ca42v2_startup */
 572
 573
 574 static void cypress_release(struct usb_serial *serial)
 575 {
 576         struct cypress_private *priv;
 577
 578         dbg("%s - port %d", __func__, serial->port[0]->number);
 579
 580         /* all open ports are closed at this point */
 581
 582         priv = usb_get_serial_port_data(serial->port[0]);
 583
 584         if (priv) {
 585                 kfifo_free(&priv->write_fifo);
 586                 kfree(priv);
 587         }
 588 }
 589
 590
 591 static int cypress_open(struct tty_struct *tty, struct usb_serial_port *port)
 592 {
 593         struct cypress_private *priv = usb_get_serial_port_data(port);
 594         struct usb_serial *serial = port->serial;
 595         unsigned long flags;
 596         int result = 0;
 597
 598         dbg("%s - port %d", __func__, port->number);
 599
 600         if (!priv->comm_is_ok)
 601                 return -EIO;
 602
 603         /* clear halts before open */
 604         usb_clear_halt(serial->dev, 0x81);
 605         usb_clear_halt(serial->dev, 0x02);
 606
 607         spin_lock_irqsave(&priv->lock, flags);
 608         /* reset read/write statistics */
 609         priv->bytes_in = 0;
 610         priv->bytes_out = 0;
 611         priv->cmd_count = 0;
 612         priv->rx_flags = 0;
 613         spin_unlock_irqrestore(&priv->lock, flags);
 614
 615         /* Set termios */
 616         cypress_send(port);
 617
 618         if (tty)
 619                 cypress_set_termios(tty, port, &priv->tmp_termios);
 620
 621         /* setup the port and start reading from the device */
 622         if (!port->interrupt_in_urb) {
 623                 dev_err(&port->dev, "%s - interrupt_in_urb is empty!\n",
 624                         __func__);
 625                 return -1;
 626         }
 627
 628         usb_fill_int_urb(port->interrupt_in_urb, serial->dev,
 629                 usb_rcvintpipe(serial->dev, port->interrupt_in_endpointAddress),
 630                 port->interrupt_in_urb->transfer_buffer,
 631                 port->interrupt_in_urb->transfer_buffer_length,
 632                 cypress_read_int_callback, port, priv->read_urb_interval);
 633         result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
 634
 635         if (result) {
 636                 dev_err(&port->dev,
 637                         "%s - failed submitting read urb, error %d\n",
 638                                                         __func__, result);
 639                 cypress_set_dead(port);
 640         }
 641         port->port.drain_delay = 256;
 642         return result;
 643 } /* cypress_open */
 644
 645 static void cypress_dtr_rts(struct usb_serial_port *port, int on)
 646 {
 647         struct cypress_private *priv = usb_get_serial_port_data(port);
 648         /* drop dtr and rts */
 649         spin_lock_irq(&priv->lock);
 650         if (on == 0)
 651                 priv->line_control = 0;
 652         else
 653                 priv->line_control = CONTROL_DTR | CONTROL_RTS;
 654         priv->cmd_ctrl = 1;
 655         spin_unlock_irq(&priv->lock);
 656         cypress_write(NULL, port, NULL, 0);
 657 }
 658
 659 static void cypress_close(struct usb_serial_port *port)
 660 {
 661         struct cypress_private *priv = usb_get_serial_port_data(port);
 662         unsigned long flags;
 663
 664         dbg("%s - port %d", __func__, port->number);
 665
 666         /* writing is potentially harmful, lock must be taken */
 667         mutex_lock(&port->serial->disc_mutex);
 668         if (port->serial->disconnected) {
 669                 mutex_unlock(&port->serial->disc_mutex);
 670                 return;
 671         }
 672         spin_lock_irqsave(&priv->lock, flags);
 673         kfifo_reset_out(&priv->write_fifo);
 674         spin_unlock_irqrestore(&priv->lock, flags);
 675
 676         dbg("%s - stopping urbs", __func__);
 677         usb_kill_urb(port->interrupt_in_urb);
 678         usb_kill_urb(port->interrupt_out_urb);
 679
 680         if (stats)
 681                 dev_info(&port->dev, "Statistics: %d Bytes In | %d Bytes Out | %d Commands Issued\n",
 682                         priv->bytes_in, priv->bytes_out, priv->cmd_count);
 683         mutex_unlock(&port->serial->disc_mutex);
 684 } /* cypress_close */
 685
 686
 687 static int cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
 688                                         const unsigned char *buf, int count)
 689 {
 690         struct cypress_private *priv = usb_get_serial_port_data(port);
 691
 692         dbg("%s - port %d, %d bytes", __func__, port->number, count);
 693
 694         /* line control commands, which need to be executed immediately,
 695            are not put into the buffer for obvious reasons.
 696          */
 697         if (priv->cmd_ctrl) {
 698                 count = 0;
 699                 goto finish;
 700         }
 701
 702         if (!count)
 703                 return count;
 704
 705         count = kfifo_in_locked(&priv->write_fifo, buf, count, &priv->lock);
 706
 707 finish:
 708         cypress_send(port);
 709
 710         return count;
 711 } /* cypress_write */
 712
 713
 714 static void cypress_send(struct usb_serial_port *port)
 715 {
 716         int count = 0, result, offset, actual_size;
 717         struct cypress_private *priv = usb_get_serial_port_data(port);
 718         unsigned long flags;
 719
 720         if (!priv->comm_is_ok)
 721                 return;
 722
 723         dbg("%s - port %d", __func__, port->number);
 724         dbg("%s - interrupt out size is %d", __func__,
 725                                                 port->interrupt_out_size);
 726
 727         spin_lock_irqsave(&priv->lock, flags);
 728         if (priv->write_urb_in_use) {
 729                 dbg("%s - can't write, urb in use", __func__);
 730                 spin_unlock_irqrestore(&priv->lock, flags);
 731                 return;
 732         }
 733         spin_unlock_irqrestore(&priv->lock, flags);
 734
 735         /* clear buffer */
 736         memset(port->interrupt_out_urb->transfer_buffer, 0,
 737                                                 port->interrupt_out_size);
 738
 739         spin_lock_irqsave(&priv->lock, flags);
 740         switch (priv->pkt_fmt) {
 741         default:
 742         case packet_format_1:
 743                 /* this is for the CY7C64013... */
 744                 offset = 2;
 745                 port->interrupt_out_buffer[0] = priv->line_control;
 746                 break;
 747         case packet_format_2:
 748                 /* this is for the CY7C63743... */
 749                 offset = 1;
 750                 port->interrupt_out_buffer[0] = priv->line_control;
 751                 break;
 752         }
 753
 754         if (priv->line_control & CONTROL_RESET)
 755                 priv->line_control &= ~CONTROL_RESET;
 756
 757         if (priv->cmd_ctrl) {
 758                 priv->cmd_count++;
 759                 dbg("%s - line control command being issued", __func__);
 760                 spin_unlock_irqrestore(&priv->lock, flags);
 761                 goto send;
 762         } else
 763                 spin_unlock_irqrestore(&priv->lock, flags);
 764
 765         count = kfifo_out_locked(&priv->write_fifo,
 766                                         &port->interrupt_out_buffer[offset],
 767                                         port->interrupt_out_size - offset,
 768                                         &priv->lock);
 769         if (count == 0)
 770                 return;
 771
 772         switch (priv->pkt_fmt) {
 773         default:
 774         case packet_format_1:
 775                 port->interrupt_out_buffer[1] = count;
 776                 break;
 777         case packet_format_2:
 778                 port->interrupt_out_buffer[0] |= count;
 779         }
 780
 781         dbg("%s - count is %d", __func__, count);
 782
 783 send:
 784         spin_lock_irqsave(&priv->lock, flags);
 785         priv->write_urb_in_use = 1;
 786         spin_unlock_irqrestore(&priv->lock, flags);
 787
 788         if (priv->cmd_ctrl)
 789                 actual_size = 1;
 790         else
 791                 actual_size = count +
 792                               (priv->pkt_fmt == packet_format_1 ? 2 : 1);
 793
 794         usb_serial_debug_data(debug, &port->dev, __func__,
 795                 port->interrupt_out_size,
 796                 port->interrupt_out_urb->transfer_buffer);
 797
 798         usb_fill_int_urb(port->interrupt_out_urb, port->serial->dev,
 799                 usb_sndintpipe(port->serial->dev, port->interrupt_out_endpointAddress),
 800                 port->interrupt_out_buffer, port->interrupt_out_size,
 801                 cypress_write_int_callback, port, priv->write_urb_interval);
 802         result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC);
 803         if (result) {
 804                 dev_err_console(port,
 805                                 "%s - failed submitting write urb, error %d\n",
 806                                                         __func__, result);
 807                 priv->write_urb_in_use = 0;
 808                 cypress_set_dead(port);
 809         }
 810
 811         spin_lock_irqsave(&priv->lock, flags);
 812         if (priv->cmd_ctrl)
 813                 priv->cmd_ctrl = 0;
 814
 815         /* do not count the line control and size bytes */
 816         priv->bytes_out += count;
 817         spin_unlock_irqrestore(&priv->lock, flags);
 818
 819         usb_serial_port_softint(port);
 820 } /* cypress_send */
 821
 822
 823 /* returns how much space is available in the soft buffer */
 824 static int cypress_write_room(struct tty_struct *tty)
 825 {
 826         struct usb_serial_port *port = tty->driver_data;
 827         struct cypress_private *priv = usb_get_serial_port_data(port);
 828         int room = 0;
 829         unsigned long flags;
 830
 831         dbg("%s - port %d", __func__, port->number);
 832
 833         spin_lock_irqsave(&priv->lock, flags);
 834         room = kfifo_avail(&priv->write_fifo);
 835         spin_unlock_irqrestore(&priv->lock, flags);
 836
 837         dbg("%s - returns %d", __func__, room);
 838         return room;
 839 }
 840
 841
 842 static int cypress_tiocmget(struct tty_struct *tty)
 843 {
 844         struct usb_serial_port *port = tty->driver_data;
 845         struct cypress_private *priv = usb_get_serial_port_data(port);
 846         __u8 status, control;
 847         unsigned int result = 0;
 848         unsigned long flags;
 849
 850         dbg("%s - port %d", __func__, port->number);
 851
 852         spin_lock_irqsave(&priv->lock, flags);
 853         control = priv->line_control;
 854         status = priv->current_status;
 855         spin_unlock_irqrestore(&priv->lock, flags);
 856
 857         result = ((control & CONTROL_DTR)        ? TIOCM_DTR : 0)
 858                 | ((control & CONTROL_RTS)       ? TIOCM_RTS : 0)
 859                 | ((status & UART_CTS)        ? TIOCM_CTS : 0)
 860                 | ((status & UART_DSR)        ? TIOCM_DSR : 0)
 861                 | ((status & UART_RI)         ? TIOCM_RI  : 0)
 862                 | ((status & UART_CD)         ? TIOCM_CD  : 0);
 863
 864         dbg("%s - result = %x", __func__, result);
 865
 866         return result;
 867 }
 868
 869
 870 static int cypress_tiocmset(struct tty_struct *tty,
 871                                unsigned int set, unsigned int clear)
 872 {
 873         struct usb_serial_port *port = tty->driver_data;
 874         struct cypress_private *priv = usb_get_serial_port_data(port);
 875         unsigned long flags;
 876
 877         dbg("%s - port %d", __func__, port->number);
 878
 879         spin_lock_irqsave(&priv->lock, flags);
 880         if (set & TIOCM_RTS)
 881                 priv->line_control |= CONTROL_RTS;
 882         if (set & TIOCM_DTR)
 883                 priv->line_control |= CONTROL_DTR;
 884         if (clear & TIOCM_RTS)
 885                 priv->line_control &= ~CONTROL_RTS;
 886         if (clear & TIOCM_DTR)
 887                 priv->line_control &= ~CONTROL_DTR;
 888         priv->cmd_ctrl = 1;
 889         spin_unlock_irqrestore(&priv->lock, flags);
 890
 891         return cypress_write(tty, port, NULL, 0);
 892 }
 893
 894
 895 static int cypress_ioctl(struct tty_struct *tty,
 896                                         unsigned int cmd, unsigned long arg)
 897 {
 898         struct usb_serial_port *port = tty->driver_data;
 899         struct cypress_private *priv = usb_get_serial_port_data(port);
 900
 901         dbg("%s - port %d, cmd 0x%.4x", __func__, port->number, cmd);
 902
 903         switch (cmd) {
 904         /* This code comes from drivers/char/serial.c and ftdi_sio.c */
 905         case TIOCMIWAIT:
 906                 while (priv != NULL) {
 907                         interruptible_sleep_on(&priv->delta_msr_wait);
 908                         /* see if a signal did it */
 909                         if (signal_pending(current))
 910                                 return -ERESTARTSYS;
 911                         else {
 912                                 char diff = priv->diff_status;
 913                                 if (diff == 0)
 914                                         return -EIO; /* no change => error */
 915
 916                                 /* consume all events */
 917                                 priv->diff_status = 0;
 918
 919                                 /* return 0 if caller wanted to know about
 920                                    these bits */
 921                                 if (((arg & TIOCM_RNG) && (diff & UART_RI)) ||
 922                                     ((arg & TIOCM_DSR) && (diff & UART_DSR)) ||
 923                                     ((arg & TIOCM_CD) && (diff & UART_CD)) ||
 924                                     ((arg & TIOCM_CTS) && (diff & UART_CTS)))
 925                                         return 0;
 926                                 /* otherwise caller can't care less about what
 927                                  * happened, and so we continue to wait for
 928                                  * more events.
 929                                  */
 930                         }
 931                 }
 932                 return 0;
 933         default:
 934                 break;
 935         }
 936         dbg("%s - arg not supported - it was 0x%04x - check include/asm/ioctls.h", __func__, cmd);
 937         return -ENOIOCTLCMD;
 938 } /* cypress_ioctl */
 939
 940
 941 static void cypress_set_termios(struct tty_struct *tty,
 942         struct usb_serial_port *port, struct ktermios *old_termios)
 943 {
 944         struct cypress_private *priv = usb_get_serial_port_data(port);
 945         int data_bits, stop_bits, parity_type, parity_enable;
 946         unsigned cflag, iflag;
 947         unsigned long flags;
 948         __u8 oldlines;
 949         int linechange = 0;
 950
 951         dbg("%s - port %d", __func__, port->number);
 952
 953         spin_lock_irqsave(&priv->lock, flags);
 954         /* We can't clean this one up as we don't know the device type
 955            early enough */
 956         if (!priv->termios_initialized) {
 957                 if (priv->chiptype == CT_EARTHMATE) {
 958                         *(tty->termios) = tty_std_termios;
 959                         tty->termios->c_cflag = B4800 | CS8 | CREAD | HUPCL |
 960                                 CLOCAL;
 961                         tty->termios->c_ispeed = 4800;
 962                         tty->termios->c_ospeed = 4800;
 963                 } else if (priv->chiptype == CT_CYPHIDCOM) {
 964                         *(tty->termios) = tty_std_termios;
 965                         tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL |
 966                                 CLOCAL;
 967                         tty->termios->c_ispeed = 9600;
 968                         tty->termios->c_ospeed = 9600;
 969                 } else if (priv->chiptype == CT_CA42V2) {
 970                         *(tty->termios) = tty_std_termios;
 971                         tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL |
 972                                 CLOCAL;
 973                         tty->termios->c_ispeed = 9600;
 974                         tty->termios->c_ospeed = 9600;
 975                 }
 976                 priv->termios_initialized = 1;
 977         }
 978         spin_unlock_irqrestore(&priv->lock, flags);
 979
 980         /* Unsupported features need clearing */
 981         tty->termios->c_cflag &= ~(CMSPAR|CRTSCTS);
 982
 983         cflag = tty->termios->c_cflag;
 984         iflag = tty->termios->c_iflag;
 985
 986         /* check if there are new settings */
 987         if (old_termios) {
 988                 spin_lock_irqsave(&priv->lock, flags);
 989                 priv->tmp_termios = *(tty->termios);
 990                 spin_unlock_irqrestore(&priv->lock, flags);
 991         }
 992
 993         /* set number of data bits, parity, stop bits */
 994         /* when parity is disabled the parity type bit is ignored */
 995
 996         /* 1 means 2 stop bits, 0 means 1 stop bit */
 997         stop_bits = cflag & CSTOPB ? 1 : 0;
 998
 999         if (cflag & PARENB) {
1000                 parity_enable = 1;
1001                 /* 1 means odd parity, 0 means even parity */
1002                 parity_type = cflag & PARODD ? 1 : 0;
1003         } else
1004                 parity_enable = parity_type = 0;
1005
1006         switch (cflag & CSIZE) {
1007         case CS5:
1008                 data_bits = 0;
1009                 break;
1010         case CS6:
1011                 data_bits = 1;
1012                 break;
1013         case CS7:
1014                 data_bits = 2;
1015                 break;
1016         case CS8:
1017                 data_bits = 3;
1018                 break;
1019         default:
1020                 dev_err(&port->dev, "%s - CSIZE was set, but not CS5-CS8\n",
1021                         __func__);
1022                 data_bits = 3;
1023         }
1024         spin_lock_irqsave(&priv->lock, flags);
1025         oldlines = priv->line_control;
1026         if ((cflag & CBAUD) == B0) {
1027                 /* drop dtr and rts */
1028                 dbg("%s - dropping the lines, baud rate 0bps", __func__);
1029                 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
1030         } else
1031                 priv->line_control = (CONTROL_DTR | CONTROL_RTS);
1032         spin_unlock_irqrestore(&priv->lock, flags);
1033
1034         dbg("%s - sending %d stop_bits, %d parity_enable, %d parity_type, "
1035                         "%d data_bits (+5)", __func__, stop_bits,
1036                         parity_enable, parity_type, data_bits);
1037
1038         cypress_serial_control(tty, port, tty_get_baud_rate(tty),
1039                         data_bits, stop_bits,
1040                         parity_enable, parity_type,
1041                         0, CYPRESS_SET_CONFIG);
1042
1043         /* we perform a CYPRESS_GET_CONFIG so that the current settings are
1044          * filled into the private structure this should confirm that all is
1045          * working if it returns what we just set */
1046         cypress_serial_control(tty, port, 0, 0, 0, 0, 0, 0, CYPRESS_GET_CONFIG);
1047
1048         /* Here we can define custom tty settings for devices; the main tty
1049          * termios flag base comes from empeg.c */
1050
1051         spin_lock_irqsave(&priv->lock, flags);
1052         if (priv->chiptype == CT_EARTHMATE && priv->baud_rate == 4800) {
1053                 dbg("Using custom termios settings for a baud rate of "
1054                                 "4800bps.");
1055                 /* define custom termios settings for NMEA protocol */
1056
1057                 tty->termios->c_iflag /* input modes - */
1058                         &= ~(IGNBRK  /* disable ignore break */
1059                         | BRKINT     /* disable break causes interrupt */
1060                         | PARMRK     /* disable mark parity errors */
1061                         | ISTRIP     /* disable clear high bit of input char */
1062                         | INLCR      /* disable translate NL to CR */
1063                         | IGNCR      /* disable ignore CR */
1064                         | ICRNL      /* disable translate CR to NL */
1065                         | IXON);     /* disable enable XON/XOFF flow control */
1066
1067                 tty->termios->c_oflag /* output modes */
1068                         &= ~OPOST;    /* disable postprocess output char */
1069
1070                 tty->termios->c_lflag /* line discipline modes */
1071                         &= ~(ECHO     /* disable echo input characters */
1072                         | ECHONL      /* disable echo new line */
1073                         | ICANON      /* disable erase, kill, werase, and rprnt
1074                                          special characters */
1075                         | ISIG        /* disable interrupt, quit, and suspend
1076                                          special characters */
1077                         | IEXTEN);    /* disable non-POSIX special characters */
1078         } /* CT_CYPHIDCOM: Application should handle this for device */
1079
1080         linechange = (priv->line_control != oldlines);
1081         spin_unlock_irqrestore(&priv->lock, flags);
1082
1083         /* if necessary, set lines */
1084         if (linechange) {
1085                 priv->cmd_ctrl = 1;
1086                 cypress_write(tty, port, NULL, 0);
1087         }
1088 } /* cypress_set_termios */
1089
1090
1091 /* returns amount of data still left in soft buffer */
1092 static int cypress_chars_in_buffer(struct tty_struct *tty)
1093 {
1094         struct usb_serial_port *port = tty->driver_data;
1095         struct cypress_private *priv = usb_get_serial_port_data(port);
1096         int chars = 0;
1097         unsigned long flags;
1098
1099         dbg("%s - port %d", __func__, port->number);
1100
1101         spin_lock_irqsave(&priv->lock, flags);
1102         chars = kfifo_len(&priv->write_fifo);
1103         spin_unlock_irqrestore(&priv->lock, flags);
1104
1105         dbg("%s - returns %d", __func__, chars);
1106         return chars;
1107 }
1108
1109
1110 static void cypress_throttle(struct tty_struct *tty)
1111 {
1112         struct usb_serial_port *port = tty->driver_data;
1113         struct cypress_private *priv = usb_get_serial_port_data(port);
1114
1115         dbg("%s - port %d", __func__, port->number);
1116
1117         spin_lock_irq(&priv->lock);
1118         priv->rx_flags = THROTTLED;
1119         spin_unlock_irq(&priv->lock);
1120 }
1121
1122
1123 static void cypress_unthrottle(struct tty_struct *tty)
1124 {
1125         struct usb_serial_port *port = tty->driver_data;
1126         struct cypress_private *priv = usb_get_serial_port_data(port);
1127         int actually_throttled, result;
1128
1129         dbg("%s - port %d", __func__, port->number);
1130
1131         spin_lock_irq(&priv->lock);
1132         actually_throttled = priv->rx_flags & ACTUALLY_THROTTLED;
1133         priv->rx_flags = 0;
1134         spin_unlock_irq(&priv->lock);
1135
1136         if (!priv->comm_is_ok)
1137                 return;
1138
1139         if (actually_throttled) {
1140                 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
1141                 if (result) {
1142                         dev_err(&port->dev, "%s - failed submitting read urb, "
1143                                         "error %d\n", __func__, result);
1144                         cypress_set_dead(port);
1145                 }
1146         }
1147 }
1148
1149
1150 static void cypress_read_int_callback(struct urb *urb)
1151 {
1152         struct usb_serial_port *port = urb->context;
1153         struct cypress_private *priv = usb_get_serial_port_data(port);
1154         struct tty_struct *tty;
1155         unsigned char *data = urb->transfer_buffer;
1156         unsigned long flags;
1157         char tty_flag = TTY_NORMAL;
1158         int havedata = 0;
1159         int bytes = 0;
1160         int result;
1161         int i = 0;
1162         int status = urb->status;
1163
1164         dbg("%s - port %d", __func__, port->number);
1165
1166         switch (status) {
1167         case 0: /* success */
1168                 break;
1169         case -ECONNRESET:
1170         case -ENOENT:
1171         case -ESHUTDOWN:
1172                 /* precursor to disconnect so just go away */
1173                 return;
1174         case -EPIPE:
1175                 /* Can't call usb_clear_halt while in_interrupt */
1176                 /* FALLS THROUGH */
1177         default:
1178                 /* something ugly is going on... */
1179                 dev_err(&urb->dev->dev,
1180                         "%s - unexpected nonzero read status received: %d\n",
1181                                                         __func__, status);
1182                 cypress_set_dead(port);
1183                 return;
1184         }
1185
1186         spin_lock_irqsave(&priv->lock, flags);
1187         if (priv->rx_flags & THROTTLED) {
1188                 dbg("%s - now throttling", __func__);
1189                 priv->rx_flags |= ACTUALLY_THROTTLED;
1190                 spin_unlock_irqrestore(&priv->lock, flags);
1191                 return;
1192         }
1193         spin_unlock_irqrestore(&priv->lock, flags);
1194
1195         tty = tty_port_tty_get(&port->port);
1196         if (!tty) {
1197                 dbg("%s - bad tty pointer - exiting", __func__);
1198                 return;
1199         }
1200
1201         spin_lock_irqsave(&priv->lock, flags);
1202         result = urb->actual_length;
1203         switch (priv->pkt_fmt) {
1204         default:
1205         case packet_format_1:
1206                 /* This is for the CY7C64013... */
1207                 priv->current_status = data[0] & 0xF8;
1208                 bytes = data[1] + 2;
1209                 i = 2;
1210                 if (bytes > 2)
1211                         havedata = 1;
1212                 break;
1213         case packet_format_2:
1214                 /* This is for the CY7C63743... */
1215                 priv->current_status = data[0] & 0xF8;
1216                 bytes = (data[0] & 0x07) + 1;
1217                 i = 1;
1218                 if (bytes > 1)
1219                         havedata = 1;
1220                 break;
1221         }
1222         spin_unlock_irqrestore(&priv->lock, flags);
1223         if (result < bytes) {
1224                 dbg("%s - wrong packet size - received %d bytes but packet "
1225                     "said %d bytes", __func__, result, bytes);
1226                 goto continue_read;
1227         }
1228
1229         usb_serial_debug_data(debug, &port->dev, __func__,
1230                                                 urb->actual_length, data);
1231
1232         spin_lock_irqsave(&priv->lock, flags);
1233         /* check to see if status has changed */
1234         if (priv->current_status != priv->prev_status) {
1235                 priv->diff_status |= priv->current_status ^
1236                         priv->prev_status;
1237                 wake_up_interruptible(&priv->delta_msr_wait);
1238                 priv->prev_status = priv->current_status;
1239         }
1240         spin_unlock_irqrestore(&priv->lock, flags);
1241
1242         /* hangup, as defined in acm.c... this might be a bad place for it
1243          * though */
1244         if (tty && !(tty->termios->c_cflag & CLOCAL) &&
1245                         !(priv->current_status & UART_CD)) {
1246                 dbg("%s - calling hangup", __func__);
1247                 tty_hangup(tty);
1248                 goto continue_read;
1249         }
1250
1251         /* There is one error bit... I'm assuming it is a parity error
1252          * indicator as the generic firmware will set this bit to 1 if a
1253          * parity error occurs.
1254          * I can not find reference to any other error events. */
1255         spin_lock_irqsave(&priv->lock, flags);
1256         if (priv->current_status & CYP_ERROR) {
1257                 spin_unlock_irqrestore(&priv->lock, flags);
1258                 tty_flag = TTY_PARITY;
1259                 dbg("%s - Parity Error detected", __func__);
1260         } else
1261                 spin_unlock_irqrestore(&priv->lock, flags);
1262
1263         /* process read if there is data other than line status */
1264         if (tty && bytes > i) {
1265                 tty_insert_flip_string_fixed_flag(tty, data + i,
1266                                 tty_flag, bytes - i);
1267                 tty_flip_buffer_push(tty);
1268         }
1269
1270         spin_lock_irqsave(&priv->lock, flags);
1271         /* control and status byte(s) are also counted */
1272         priv->bytes_in += bytes;
1273         spin_unlock_irqrestore(&priv->lock, flags);
1274
1275 continue_read:
1276         tty_kref_put(tty);
1277
1278         /* Continue trying to always read */
1279
1280         if (priv->comm_is_ok) {
1281                 usb_fill_int_urb(port->interrupt_in_urb, port->serial->dev,
1282                                 usb_rcvintpipe(port->serial->dev,
1283                                         port->interrupt_in_endpointAddress),
1284                                 port->interrupt_in_urb->transfer_buffer,
1285                                 port->interrupt_in_urb->transfer_buffer_length,
1286                                 cypress_read_int_callback, port,
1287                                 priv->read_urb_interval);
1288                 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
1289                 if (result && result != -EPERM) {
1290                         dev_err(&urb->dev->dev, "%s - failed resubmitting "
1291                                         "read urb, error %d\n", __func__,
1292                                         result);
1293                         cypress_set_dead(port);
1294                 }
1295         }
1296 } /* cypress_read_int_callback */
1297
1298
1299 static void cypress_write_int_callback(struct urb *urb)
1300 {
1301         struct usb_serial_port *port = urb->context;
1302         struct cypress_private *priv = usb_get_serial_port_data(port);
1303         int result;
1304         int status = urb->status;
1305
1306         dbg("%s - port %d", __func__, port->number);
1307
1308         switch (status) {
1309         case 0:
1310                 /* success */
1311                 break;
1312         case -ECONNRESET:
1313         case -ENOENT:
1314         case -ESHUTDOWN:
1315                 /* this urb is terminated, clean up */
1316                 dbg("%s - urb shutting down with status: %d",
1317                                                 __func__, status);
1318                 priv->write_urb_in_use = 0;
1319                 return;
1320         case -EPIPE: /* no break needed; clear halt and resubmit */
1321                 if (!priv->comm_is_ok)
1322                         break;
1323                 usb_clear_halt(port->serial->dev, 0x02);
1324                 /* error in the urb, so we have to resubmit it */
1325                 dbg("%s - nonzero write bulk status received: %d",
1326                         __func__, status);
1327                 port->interrupt_out_urb->transfer_buffer_length = 1;
1328                 result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC);
1329                 if (!result)
1330                         return;
1331                 dev_err(&urb->dev->dev,
1332                         "%s - failed resubmitting write urb, error %d\n",
1333                                                         __func__, result);
1334                 cypress_set_dead(port);
1335                 break;
1336         default:
1337                 dev_err(&urb->dev->dev,
1338                          "%s - unexpected nonzero write status received: %d\n",
1339                                                         __func__, status);
1340                 cypress_set_dead(port);
1341                 break;
1342         }
1343         priv->write_urb_in_use = 0;
1344
1345         /* send any buffered data */
1346         cypress_send(port);
1347 }
1348
1349 module_usb_serial_driver(cypress_driver, serial_drivers);
1350
1351 MODULE_AUTHOR(DRIVER_AUTHOR);
1352 MODULE_DESCRIPTION(DRIVER_DESC);
1353 MODULE_VERSION(DRIVER_VERSION);
1354 MODULE_LICENSE("GPL");
1355
1356 module_param(debug, bool, S_IRUGO | S_IWUSR);
1357 MODULE_PARM_DESC(debug, "Debug enabled or not");
1358 module_param(stats, bool, S_IRUGO | S_IWUSR);
1359 MODULE_PARM_DESC(stats, "Enable statistics or not");
1360 module_param(interval, int, S_IRUGO | S_IWUSR);
1361 MODULE_PARM_DESC(interval, "Overrides interrupt interval");
1362 module_param(unstable_bauds, bool, S_IRUGO | S_IWUSR);
1363 MODULE_PARM_DESC(unstable_bauds, "Allow unstable baud rates");