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/slab.h>
  31 #include <linux/tty.h>
  32 #include <linux/tty_driver.h>
  33 #include <linux/tty_flip.h>
  34 #include <linux/module.h>
  35 #include <linux/moduleparam.h>
  36 #include <linux/spinlock.h>
  37 #include <linux/usb.h>
  38 #include <linux/usb/serial.h>
  39 #include <linux/serial.h>
  40 #include <linux/kfifo.h>
  41 #include <linux/delay.h>
  42 #include <linux/uaccess.h>
  43 #include <asm/unaligned.h>
  44
  45 #include "cypress_m8.h"
  46
  47
  48 static bool stats;
  49 static int interval;
  50 static bool unstable_bauds;
  51
  52 #define DRIVER_AUTHOR "Lonnie Mendez <dignome@gmail.com>, Neil Whelchel <koyama@firstlight.net>"
  53 #define DRIVER_DESC "Cypress USB to Serial Driver"
  54
  55 /* write buffer size defines */
  56 #define CYPRESS_BUF_SIZE        1024
  57
  58 static const struct usb_device_id id_table_earthmate[] = {
  59         { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
  60         { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
  61         { }                                             /* Terminating entry */
  62 };
  63
  64 static const struct usb_device_id id_table_cyphidcomrs232[] = {
  65         { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
  66         { USB_DEVICE(VENDOR_ID_SAI, PRODUCT_ID_CYPHIDCOM) },
  67         { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) },
  68         { USB_DEVICE(VENDOR_ID_FRWD, PRODUCT_ID_CYPHIDCOM_FRWD) },
  69         { }                                             /* Terminating entry */
  70 };
  71
  72 static const struct usb_device_id id_table_nokiaca42v2[] = {
  73         { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
  74         { }                                             /* Terminating entry */
  75 };
  76
  77 static const struct usb_device_id id_table_combined[] = {
  78         { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
  79         { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
  80         { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
  81         { USB_DEVICE(VENDOR_ID_SAI, PRODUCT_ID_CYPHIDCOM) },
  82         { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) },
  83         { USB_DEVICE(VENDOR_ID_FRWD, PRODUCT_ID_CYPHIDCOM_FRWD) },
  84         { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
  85         { }                                             /* Terminating entry */
  86 };
  87
  88 MODULE_DEVICE_TABLE(usb, id_table_combined);
  89
  90 enum packet_format {
  91         packet_format_1,  /* b0:status, b1:payload count */
  92         packet_format_2   /* b0[7:3]:status, b0[2:0]:payload count */
  93 };
  94
  95 struct cypress_private {
  96         spinlock_t lock;                   /* private lock */
  97         int chiptype;                      /* identifier of device, for quirks/etc */
  98         int bytes_in;                      /* used for statistics */
  99         int bytes_out;                     /* used for statistics */
 100         int cmd_count;                     /* used for statistics */
 101         int cmd_ctrl;                      /* always set this to 1 before issuing a command */
 102         struct kfifo write_fifo;           /* write fifo */
 103         int write_urb_in_use;              /* write urb in use indicator */
 104         int write_urb_interval;            /* interval to use for write urb */
 105         int read_urb_interval;             /* interval to use for read urb */
 106         int comm_is_ok;                    /* true if communication is (still) ok */
 107         int termios_initialized;
 108         __u8 line_control;                 /* holds dtr / rts value */
 109         __u8 current_status;               /* received from last read - info on dsr,cts,cd,ri,etc */
 110         __u8 current_config;               /* stores the current configuration byte */
 111         __u8 rx_flags;                     /* throttling - used from whiteheat/ftdi_sio */
 112         enum packet_format pkt_fmt;        /* format to use for packet send / receive */
 113         int get_cfg_unsafe;                /* If true, the CYPRESS_GET_CONFIG is unsafe */
 114         int baud_rate;                     /* stores current baud rate in
 115                                               integer form */
 116         int isthrottled;                   /* if throttled, discard reads */
 117         char prev_status;                  /* used for TIOCMIWAIT */
 118         /* we pass a pointer to this as the argument sent to
 119            cypress_set_termios old_termios */
 120         struct ktermios tmp_termios;       /* stores the old termios settings */
 121 };
 122
 123 /* function prototypes for the Cypress USB to serial device */
 124 static int  cypress_earthmate_port_probe(struct usb_serial_port *port);
 125 static int  cypress_hidcom_port_probe(struct usb_serial_port *port);
 126 static int  cypress_ca42v2_port_probe(struct usb_serial_port *port);
 127 static int  cypress_port_remove(struct usb_serial_port *port);
 128 static int  cypress_open(struct tty_struct *tty, struct usb_serial_port *port);
 129 static void cypress_close(struct usb_serial_port *port);
 130 static void cypress_dtr_rts(struct usb_serial_port *port, int on);
 131 static int  cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
 132                         const unsigned char *buf, int count);
 133 static void cypress_send(struct usb_serial_port *port);
 134 static int  cypress_write_room(struct tty_struct *tty);
 135 static void cypress_set_termios(struct tty_struct *tty,
 136                         struct usb_serial_port *port, struct ktermios *old);
 137 static int  cypress_tiocmget(struct tty_struct *tty);
 138 static int  cypress_tiocmset(struct tty_struct *tty,
 139                         unsigned int set, unsigned int clear);
 140 static int  cypress_chars_in_buffer(struct tty_struct *tty);
 141 static void cypress_throttle(struct tty_struct *tty);
 142 static void cypress_unthrottle(struct tty_struct *tty);
 143 static void cypress_set_dead(struct usb_serial_port *port);
 144 static void cypress_read_int_callback(struct urb *urb);
 145 static void cypress_write_int_callback(struct urb *urb);
 146
 147 static struct usb_serial_driver cypress_earthmate_device = {
 148         .driver = {
 149                 .owner =                THIS_MODULE,
 150                 .name =                 "earthmate",
 151         },
 152         .description =                  "DeLorme Earthmate USB",
 153         .id_table =                     id_table_earthmate,
 154         .num_ports =                    1,
 155         .port_probe =                   cypress_earthmate_port_probe,
 156         .port_remove =                  cypress_port_remove,
 157         .open =                         cypress_open,
 158         .close =                        cypress_close,
 159         .dtr_rts =                      cypress_dtr_rts,
 160         .write =                        cypress_write,
 161         .write_room =                   cypress_write_room,
 162         .set_termios =                  cypress_set_termios,
 163         .tiocmget =                     cypress_tiocmget,
 164         .tiocmset =                     cypress_tiocmset,
 165         .tiocmiwait =                   usb_serial_generic_tiocmiwait,
 166         .chars_in_buffer =              cypress_chars_in_buffer,
 167         .throttle =                     cypress_throttle,
 168         .unthrottle =                   cypress_unthrottle,
 169         .read_int_callback =            cypress_read_int_callback,
 170         .write_int_callback =           cypress_write_int_callback,
 171 };
 172
 173 static struct usb_serial_driver cypress_hidcom_device = {
 174         .driver = {
 175                 .owner =                THIS_MODULE,
 176                 .name =                 "cyphidcom",
 177         },
 178         .description =                  "HID->COM RS232 Adapter",
 179         .id_table =                     id_table_cyphidcomrs232,
 180         .num_ports =                    1,
 181         .port_probe =                   cypress_hidcom_port_probe,
 182         .port_remove =                  cypress_port_remove,
 183         .open =                         cypress_open,
 184         .close =                        cypress_close,
 185         .dtr_rts =                      cypress_dtr_rts,
 186         .write =                        cypress_write,
 187         .write_room =                   cypress_write_room,
 188         .set_termios =                  cypress_set_termios,
 189         .tiocmget =                     cypress_tiocmget,
 190         .tiocmset =                     cypress_tiocmset,
 191         .tiocmiwait =                   usb_serial_generic_tiocmiwait,
 192         .chars_in_buffer =              cypress_chars_in_buffer,
 193         .throttle =                     cypress_throttle,
 194         .unthrottle =                   cypress_unthrottle,
 195         .read_int_callback =            cypress_read_int_callback,
 196         .write_int_callback =           cypress_write_int_callback,
 197 };
 198
 199 static struct usb_serial_driver cypress_ca42v2_device = {
 200         .driver = {
 201                 .owner =                THIS_MODULE,
 202                 .name =                 "nokiaca42v2",
 203         },
 204         .description =                  "Nokia CA-42 V2 Adapter",
 205         .id_table =                     id_table_nokiaca42v2,
 206         .num_ports =                    1,
 207         .port_probe =                   cypress_ca42v2_port_probe,
 208         .port_remove =                  cypress_port_remove,
 209         .open =                         cypress_open,
 210         .close =                        cypress_close,
 211         .dtr_rts =                      cypress_dtr_rts,
 212         .write =                        cypress_write,
 213         .write_room =                   cypress_write_room,
 214         .set_termios =                  cypress_set_termios,
 215         .tiocmget =                     cypress_tiocmget,
 216         .tiocmset =                     cypress_tiocmset,
 217         .tiocmiwait =                   usb_serial_generic_tiocmiwait,
 218         .chars_in_buffer =              cypress_chars_in_buffer,
 219         .throttle =                     cypress_throttle,
 220         .unthrottle =                   cypress_unthrottle,
 221         .read_int_callback =            cypress_read_int_callback,
 222         .write_int_callback =           cypress_write_int_callback,
 223 };
 224
 225 static struct usb_serial_driver * const serial_drivers[] = {
 226         &cypress_earthmate_device, &cypress_hidcom_device,
 227         &cypress_ca42v2_device, NULL
 228 };
 229
 230 /*****************************************************************************
 231  * Cypress serial helper functions
 232  *****************************************************************************/
 233
 234 /* FRWD Dongle hidcom needs to skip reset and speed checks */
 235 static inline bool is_frwd(struct usb_device *dev)
 236 {
 237         return ((le16_to_cpu(dev->descriptor.idVendor) == VENDOR_ID_FRWD) &&
 238                 (le16_to_cpu(dev->descriptor.idProduct) == PRODUCT_ID_CYPHIDCOM_FRWD));
 239 }
 240
 241 static int analyze_baud_rate(struct usb_serial_port *port, speed_t new_rate)
 242 {
 243         struct cypress_private *priv;
 244         priv = usb_get_serial_port_data(port);
 245
 246         if (unstable_bauds)
 247                 return new_rate;
 248
 249         /* FRWD Dongle uses 115200 bps */
 250         if (is_frwd(port->serial->dev))
 251                 return new_rate;
 252
 253         /*
 254          * The general purpose firmware for the Cypress M8 allows for
 255          * a maximum speed of 57600bps (I have no idea whether DeLorme
 256          * chose to use the general purpose firmware or not), if you
 257          * need to modify this speed setting for your own project
 258          * please add your own chiptype and modify the code likewise.
 259          * The Cypress HID->COM device will work successfully up to
 260          * 115200bps (but the actual throughput is around 3kBps).
 261          */
 262         if (port->serial->dev->speed == USB_SPEED_LOW) {
 263                 /*
 264                  * Mike Isely <isely@pobox.com> 2-Feb-2008: The
 265                  * Cypress app note that describes this mechanism
 266                  * states the the low-speed part can't handle more
 267                  * than 800 bytes/sec, in which case 4800 baud is the
 268                  * safest speed for a part like that.
 269                  */
 270                 if (new_rate > 4800) {
 271                         dev_dbg(&port->dev,
 272                                 "%s - failed setting baud rate, device incapable speed %d\n",
 273                                 __func__, new_rate);
 274                         return -1;
 275                 }
 276         }
 277         switch (priv->chiptype) {
 278         case CT_EARTHMATE:
 279                 if (new_rate <= 600) {
 280                         /* 300 and 600 baud rates are supported under
 281                          * the generic firmware, but are not used with
 282                          * NMEA and SiRF protocols */
 283                         dev_dbg(&port->dev,
 284                                 "%s - failed setting baud rate, unsupported speed of %d on Earthmate GPS\n",
 285                                 __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         struct device *dev = &port->dev;
 305         u8 *feature_buffer;
 306         const unsigned int feature_len = 5;
 307         unsigned long flags;
 308
 309         priv = usb_get_serial_port_data(port);
 310
 311         if (!priv->comm_is_ok)
 312                 return -ENODEV;
 313
 314         feature_buffer = kcalloc(feature_len, sizeof(u8), GFP_KERNEL);
 315         if (!feature_buffer)
 316                 return -ENOMEM;
 317
 318         switch (cypress_request_type) {
 319         case CYPRESS_SET_CONFIG:
 320                 /* 0 means 'Hang up' so doesn't change the true bit rate */
 321                 new_baudrate = priv->baud_rate;
 322                 if (baud_rate && baud_rate != priv->baud_rate) {
 323                         dev_dbg(dev, "%s - baud rate is changing\n", __func__);
 324                         retval = analyze_baud_rate(port, baud_rate);
 325                         if (retval >= 0) {
 326                                 new_baudrate = retval;
 327                                 dev_dbg(dev, "%s - New baud rate set to %d\n",
 328                                         __func__, new_baudrate);
 329                         }
 330                 }
 331                 dev_dbg(dev, "%s - baud rate is being sent as %d\n", __func__,
 332                         new_baudrate);
 333
 334                 /* fill the feature_buffer with new configuration */
 335                 put_unaligned_le32(new_baudrate, feature_buffer);
 336                 feature_buffer[4] |= data_bits;   /* assign data bits in 2 bit space ( max 3 ) */
 337                 /* 1 bit gap */
 338                 feature_buffer[4] |= (stop_bits << 3);   /* assign stop bits in 1 bit space */
 339                 feature_buffer[4] |= (parity_enable << 4);   /* assign parity flag in 1 bit space */
 340                 feature_buffer[4] |= (parity_type << 5);   /* assign parity type in 1 bit space */
 341                 /* 1 bit gap */
 342                 feature_buffer[4] |= (reset << 7);   /* assign reset at end of byte, 1 bit space */
 343
 344                 dev_dbg(dev, "%s - device is being sent this feature report:\n", __func__);
 345                 dev_dbg(dev, "%s - %02X - %02X - %02X - %02X - %02X\n", __func__,
 346                         feature_buffer[0], feature_buffer[1],
 347                         feature_buffer[2], feature_buffer[3],
 348                         feature_buffer[4]);
 349
 350                 do {
 351                         retval = usb_control_msg(port->serial->dev,
 352                                         usb_sndctrlpipe(port->serial->dev, 0),
 353                                         HID_REQ_SET_REPORT,
 354                                         USB_DIR_OUT | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
 355                                         0x0300, 0, feature_buffer,
 356                                         feature_len, 500);
 357
 358                         if (tries++ >= 3)
 359                                 break;
 360
 361                 } while (retval != feature_len &&
 362                          retval != -ENODEV);
 363
 364                 if (retval != feature_len) {
 365                         dev_err(dev, "%s - failed sending serial line settings - %d\n",
 366                                 __func__, retval);
 367                         cypress_set_dead(port);
 368                 } else {
 369                         spin_lock_irqsave(&priv->lock, flags);
 370                         priv->baud_rate = new_baudrate;
 371                         priv->current_config = feature_buffer[4];
 372                         spin_unlock_irqrestore(&priv->lock, flags);
 373                         /* If we asked for a speed change encode it */
 374                         if (baud_rate)
 375                                 tty_encode_baud_rate(tty,
 376                                         new_baudrate, new_baudrate);
 377                 }
 378         break;
 379         case CYPRESS_GET_CONFIG:
 380                 if (priv->get_cfg_unsafe) {
 381                         /* Not implemented for this device,
 382                            and if we try to do it we're likely
 383                            to crash the hardware. */
 384                         retval = -ENOTTY;
 385                         goto out;
 386                 }
 387                 dev_dbg(dev, "%s - retreiving serial line settings\n", __func__);
 388                 do {
 389                         retval = usb_control_msg(port->serial->dev,
 390                                         usb_rcvctrlpipe(port->serial->dev, 0),
 391                                         HID_REQ_GET_REPORT,
 392                                         USB_DIR_IN | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
 393                                         0x0300, 0, feature_buffer,
 394                                         feature_len, 500);
 395
 396                         if (tries++ >= 3)
 397                                 break;
 398                 } while (retval != feature_len
 399                                                 && retval != -ENODEV);
 400
 401                 if (retval != feature_len) {
 402                         dev_err(dev, "%s - failed to retrieve serial line settings - %d\n",
 403                                 __func__, retval);
 404                         cypress_set_dead(port);
 405                         goto out;
 406                 } else {
 407                         spin_lock_irqsave(&priv->lock, flags);
 408                         /* store the config in one byte, and later
 409                            use bit masks to check values */
 410                         priv->current_config = feature_buffer[4];
 411                         priv->baud_rate = get_unaligned_le32(feature_buffer);
 412                         spin_unlock_irqrestore(&priv->lock, flags);
 413                 }
 414         }
 415         spin_lock_irqsave(&priv->lock, flags);
 416         ++priv->cmd_count;
 417         spin_unlock_irqrestore(&priv->lock, flags);
 418 out:
 419         kfree(feature_buffer);
 420         return retval;
 421 } /* cypress_serial_control */
 422
 423
 424 static void cypress_set_dead(struct usb_serial_port *port)
 425 {
 426         struct cypress_private *priv = usb_get_serial_port_data(port);
 427         unsigned long flags;
 428
 429         spin_lock_irqsave(&priv->lock, flags);
 430         if (!priv->comm_is_ok) {
 431                 spin_unlock_irqrestore(&priv->lock, flags);
 432                 return;
 433         }
 434         priv->comm_is_ok = 0;
 435         spin_unlock_irqrestore(&priv->lock, flags);
 436
 437         dev_err(&port->dev, "cypress_m8 suspending failing port %d - "
 438                 "interval might be too short\n", port->port_number);
 439 }
 440
 441
 442 /*****************************************************************************
 443  * Cypress serial driver functions
 444  *****************************************************************************/
 445
 446
 447 static int cypress_generic_port_probe(struct usb_serial_port *port)
 448 {
 449         struct usb_serial *serial = port->serial;
 450         struct cypress_private *priv;
 451
 452         if (!port->interrupt_out_urb || !port->interrupt_in_urb) {
 453                 dev_err(&port->dev, "required endpoint is missing\n");
 454                 return -ENODEV;
 455         }
 456
 457         priv = kzalloc(sizeof(struct cypress_private), GFP_KERNEL);
 458         if (!priv)
 459                 return -ENOMEM;
 460
 461         priv->comm_is_ok = !0;
 462         spin_lock_init(&priv->lock);
 463         if (kfifo_alloc(&priv->write_fifo, CYPRESS_BUF_SIZE, GFP_KERNEL)) {
 464                 kfree(priv);
 465                 return -ENOMEM;
 466         }
 467
 468         /* Skip reset for FRWD device. It is a workaound:
 469            device hangs if it receives SET_CONFIGURE in Configured
 470            state. */
 471         if (!is_frwd(serial->dev))
 472                 usb_reset_configuration(serial->dev);
 473
 474         priv->cmd_ctrl = 0;
 475         priv->line_control = 0;
 476         priv->termios_initialized = 0;
 477         priv->rx_flags = 0;
 478         /* Default packet format setting is determined by packet size.
 479            Anything with a size larger then 9 must have a separate
 480            count field since the 3 bit count field is otherwise too
 481            small.  Otherwise we can use the slightly more compact
 482            format.  This is in accordance with the cypress_m8 serial
 483            converter app note. */
 484         if (port->interrupt_out_size > 9)
 485                 priv->pkt_fmt = packet_format_1;
 486         else
 487                 priv->pkt_fmt = packet_format_2;
 488
 489         if (interval > 0) {
 490                 priv->write_urb_interval = interval;
 491                 priv->read_urb_interval = interval;
 492                 dev_dbg(&port->dev, "%s - read & write intervals forced to %d\n",
 493                         __func__, interval);
 494         } else {
 495                 priv->write_urb_interval = port->interrupt_out_urb->interval;
 496                 priv->read_urb_interval = port->interrupt_in_urb->interval;
 497                 dev_dbg(&port->dev, "%s - intervals: read=%d write=%d\n",
 498                         __func__, priv->read_urb_interval,
 499                         priv->write_urb_interval);
 500         }
 501         usb_set_serial_port_data(port, priv);
 502
 503         port->port.drain_delay = 256;
 504
 505         return 0;
 506 }
 507
 508
 509 static int cypress_earthmate_port_probe(struct usb_serial_port *port)
 510 {
 511         struct usb_serial *serial = port->serial;
 512         struct cypress_private *priv;
 513         int ret;
 514
 515         ret = cypress_generic_port_probe(port);
 516         if (ret) {
 517                 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
 518                 return ret;
 519         }
 520
 521         priv = usb_get_serial_port_data(port);
 522         priv->chiptype = CT_EARTHMATE;
 523         /* All Earthmate devices use the separated-count packet
 524            format!  Idiotic. */
 525         priv->pkt_fmt = packet_format_1;
 526         if (serial->dev->descriptor.idProduct !=
 527                                 cpu_to_le16(PRODUCT_ID_EARTHMATEUSB)) {
 528                 /* The old original USB Earthmate seemed able to
 529                    handle GET_CONFIG requests; everything they've
 530                    produced since that time crashes if this command is
 531                    attempted :-( */
 532                 dev_dbg(&port->dev,
 533                         "%s - Marking this device as unsafe for GET_CONFIG commands\n",
 534                         __func__);
 535                 priv->get_cfg_unsafe = !0;
 536         }
 537
 538         return 0;
 539 }
 540
 541 static int cypress_hidcom_port_probe(struct usb_serial_port *port)
 542 {
 543         struct cypress_private *priv;
 544         int ret;
 545
 546         ret = cypress_generic_port_probe(port);
 547         if (ret) {
 548                 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
 549                 return ret;
 550         }
 551
 552         priv = usb_get_serial_port_data(port);
 553         priv->chiptype = CT_CYPHIDCOM;
 554
 555         return 0;
 556 }
 557
 558 static int cypress_ca42v2_port_probe(struct usb_serial_port *port)
 559 {
 560         struct cypress_private *priv;
 561         int ret;
 562
 563         ret = cypress_generic_port_probe(port);
 564         if (ret) {
 565                 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
 566                 return ret;
 567         }
 568
 569         priv = usb_get_serial_port_data(port);
 570         priv->chiptype = CT_CA42V2;
 571
 572         return 0;
 573 }
 574
 575 static int cypress_port_remove(struct usb_serial_port *port)
 576 {
 577         struct cypress_private *priv;
 578
 579         priv = usb_get_serial_port_data(port);
 580
 581         kfifo_free(&priv->write_fifo);
 582         kfree(priv);
 583
 584         return 0;
 585 }
 586
 587 static int cypress_open(struct tty_struct *tty, struct usb_serial_port *port)
 588 {
 589         struct cypress_private *priv = usb_get_serial_port_data(port);
 590         struct usb_serial *serial = port->serial;
 591         unsigned long flags;
 592         int result = 0;
 593
 594         if (!priv->comm_is_ok)
 595                 return -EIO;
 596
 597         /* clear halts before open */
 598         usb_clear_halt(serial->dev, 0x81);
 599         usb_clear_halt(serial->dev, 0x02);
 600
 601         spin_lock_irqsave(&priv->lock, flags);
 602         /* reset read/write statistics */
 603         priv->bytes_in = 0;
 604         priv->bytes_out = 0;
 605         priv->cmd_count = 0;
 606         priv->rx_flags = 0;
 607         spin_unlock_irqrestore(&priv->lock, flags);
 608
 609         /* Set termios */
 610         cypress_send(port);
 611
 612         if (tty)
 613                 cypress_set_termios(tty, port, &priv->tmp_termios);
 614
 615         /* setup the port and start reading from the device */
 616         usb_fill_int_urb(port->interrupt_in_urb, serial->dev,
 617                 usb_rcvintpipe(serial->dev, port->interrupt_in_endpointAddress),
 618                 port->interrupt_in_urb->transfer_buffer,
 619                 port->interrupt_in_urb->transfer_buffer_length,
 620                 cypress_read_int_callback, port, priv->read_urb_interval);
 621         result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
 622
 623         if (result) {
 624                 dev_err(&port->dev,
 625                         "%s - failed submitting read urb, error %d\n",
 626                                                         __func__, result);
 627                 cypress_set_dead(port);
 628         }
 629
 630         return result;
 631 } /* cypress_open */
 632
 633 static void cypress_dtr_rts(struct usb_serial_port *port, int on)
 634 {
 635         struct cypress_private *priv = usb_get_serial_port_data(port);
 636         /* drop dtr and rts */
 637         spin_lock_irq(&priv->lock);
 638         if (on == 0)
 639                 priv->line_control = 0;
 640         else
 641                 priv->line_control = CONTROL_DTR | CONTROL_RTS;
 642         priv->cmd_ctrl = 1;
 643         spin_unlock_irq(&priv->lock);
 644         cypress_write(NULL, port, NULL, 0);
 645 }
 646
 647 static void cypress_close(struct usb_serial_port *port)
 648 {
 649         struct cypress_private *priv = usb_get_serial_port_data(port);
 650         unsigned long flags;
 651
 652         spin_lock_irqsave(&priv->lock, flags);
 653         kfifo_reset_out(&priv->write_fifo);
 654         spin_unlock_irqrestore(&priv->lock, flags);
 655
 656         dev_dbg(&port->dev, "%s - stopping urbs\n", __func__);
 657         usb_kill_urb(port->interrupt_in_urb);
 658         usb_kill_urb(port->interrupt_out_urb);
 659
 660         if (stats)
 661                 dev_info(&port->dev, "Statistics: %d Bytes In | %d Bytes Out | %d Commands Issued\n",
 662                         priv->bytes_in, priv->bytes_out, priv->cmd_count);
 663 } /* cypress_close */
 664
 665
 666 static int cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
 667                                         const unsigned char *buf, int count)
 668 {
 669         struct cypress_private *priv = usb_get_serial_port_data(port);
 670
 671         dev_dbg(&port->dev, "%s - %d bytes\n", __func__, count);
 672
 673         /* line control commands, which need to be executed immediately,
 674            are not put into the buffer for obvious reasons.
 675          */
 676         if (priv->cmd_ctrl) {
 677                 count = 0;
 678                 goto finish;
 679         }
 680
 681         if (!count)
 682                 return count;
 683
 684         count = kfifo_in_locked(&priv->write_fifo, buf, count, &priv->lock);
 685
 686 finish:
 687         cypress_send(port);
 688
 689         return count;
 690 } /* cypress_write */
 691
 692
 693 static void cypress_send(struct usb_serial_port *port)
 694 {
 695         int count = 0, result, offset, actual_size;
 696         struct cypress_private *priv = usb_get_serial_port_data(port);
 697         struct device *dev = &port->dev;
 698         unsigned long flags;
 699
 700         if (!priv->comm_is_ok)
 701                 return;
 702
 703         dev_dbg(dev, "%s - interrupt out size is %d\n", __func__,
 704                 port->interrupt_out_size);
 705
 706         spin_lock_irqsave(&priv->lock, flags);
 707         if (priv->write_urb_in_use) {
 708                 dev_dbg(dev, "%s - can't write, urb in use\n", __func__);
 709                 spin_unlock_irqrestore(&priv->lock, flags);
 710                 return;
 711         }
 712         spin_unlock_irqrestore(&priv->lock, flags);
 713
 714         /* clear buffer */
 715         memset(port->interrupt_out_urb->transfer_buffer, 0,
 716                                                 port->interrupt_out_size);
 717
 718         spin_lock_irqsave(&priv->lock, flags);
 719         switch (priv->pkt_fmt) {
 720         default:
 721         case packet_format_1:
 722                 /* this is for the CY7C64013... */
 723                 offset = 2;
 724                 port->interrupt_out_buffer[0] = priv->line_control;
 725                 break;
 726         case packet_format_2:
 727                 /* this is for the CY7C63743... */
 728                 offset = 1;
 729                 port->interrupt_out_buffer[0] = priv->line_control;
 730                 break;
 731         }
 732
 733         if (priv->line_control & CONTROL_RESET)
 734                 priv->line_control &= ~CONTROL_RESET;
 735
 736         if (priv->cmd_ctrl) {
 737                 priv->cmd_count++;
 738                 dev_dbg(dev, "%s - line control command being issued\n", __func__);
 739                 spin_unlock_irqrestore(&priv->lock, flags);
 740                 goto send;
 741         } else
 742                 spin_unlock_irqrestore(&priv->lock, flags);
 743
 744         count = kfifo_out_locked(&priv->write_fifo,
 745                                         &port->interrupt_out_buffer[offset],
 746                                         port->interrupt_out_size - offset,
 747                                         &priv->lock);
 748         if (count == 0)
 749                 return;
 750
 751         switch (priv->pkt_fmt) {
 752         default:
 753         case packet_format_1:
 754                 port->interrupt_out_buffer[1] = count;
 755                 break;
 756         case packet_format_2:
 757                 port->interrupt_out_buffer[0] |= count;
 758         }
 759
 760         dev_dbg(dev, "%s - count is %d\n", __func__, count);
 761
 762 send:
 763         spin_lock_irqsave(&priv->lock, flags);
 764         priv->write_urb_in_use = 1;
 765         spin_unlock_irqrestore(&priv->lock, flags);
 766
 767         if (priv->cmd_ctrl)
 768                 actual_size = 1;
 769         else
 770                 actual_size = count +
 771                               (priv->pkt_fmt == packet_format_1 ? 2 : 1);
 772
 773         usb_serial_debug_data(dev, __func__, port->interrupt_out_size,
 774                               port->interrupt_out_urb->transfer_buffer);
 775
 776         usb_fill_int_urb(port->interrupt_out_urb, port->serial->dev,
 777                 usb_sndintpipe(port->serial->dev, port->interrupt_out_endpointAddress),
 778                 port->interrupt_out_buffer, actual_size,
 779                 cypress_write_int_callback, port, priv->write_urb_interval);
 780         result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC);
 781         if (result) {
 782                 dev_err_console(port,
 783                                 "%s - failed submitting write urb, error %d\n",
 784                                                         __func__, result);
 785                 priv->write_urb_in_use = 0;
 786                 cypress_set_dead(port);
 787         }
 788
 789         spin_lock_irqsave(&priv->lock, flags);
 790         if (priv->cmd_ctrl)
 791                 priv->cmd_ctrl = 0;
 792
 793         /* do not count the line control and size bytes */
 794         priv->bytes_out += count;
 795         spin_unlock_irqrestore(&priv->lock, flags);
 796
 797         usb_serial_port_softint(port);
 798 } /* cypress_send */
 799
 800
 801 /* returns how much space is available in the soft buffer */
 802 static int cypress_write_room(struct tty_struct *tty)
 803 {
 804         struct usb_serial_port *port = tty->driver_data;
 805         struct cypress_private *priv = usb_get_serial_port_data(port);
 806         int room = 0;
 807         unsigned long flags;
 808
 809         spin_lock_irqsave(&priv->lock, flags);
 810         room = kfifo_avail(&priv->write_fifo);
 811         spin_unlock_irqrestore(&priv->lock, flags);
 812
 813         dev_dbg(&port->dev, "%s - returns %d\n", __func__, room);
 814         return room;
 815 }
 816
 817
 818 static int cypress_tiocmget(struct tty_struct *tty)
 819 {
 820         struct usb_serial_port *port = tty->driver_data;
 821         struct cypress_private *priv = usb_get_serial_port_data(port);
 822         __u8 status, control;
 823         unsigned int result = 0;
 824         unsigned long flags;
 825
 826         spin_lock_irqsave(&priv->lock, flags);
 827         control = priv->line_control;
 828         status = priv->current_status;
 829         spin_unlock_irqrestore(&priv->lock, flags);
 830
 831         result = ((control & CONTROL_DTR)        ? TIOCM_DTR : 0)
 832                 | ((control & CONTROL_RTS)       ? TIOCM_RTS : 0)
 833                 | ((status & UART_CTS)        ? TIOCM_CTS : 0)
 834                 | ((status & UART_DSR)        ? TIOCM_DSR : 0)
 835                 | ((status & UART_RI)         ? TIOCM_RI  : 0)
 836                 | ((status & UART_CD)         ? TIOCM_CD  : 0);
 837
 838         dev_dbg(&port->dev, "%s - result = %x\n", __func__, result);
 839
 840         return result;
 841 }
 842
 843
 844 static int cypress_tiocmset(struct tty_struct *tty,
 845                                unsigned int set, unsigned int clear)
 846 {
 847         struct usb_serial_port *port = tty->driver_data;
 848         struct cypress_private *priv = usb_get_serial_port_data(port);
 849         unsigned long flags;
 850
 851         spin_lock_irqsave(&priv->lock, flags);
 852         if (set & TIOCM_RTS)
 853                 priv->line_control |= CONTROL_RTS;
 854         if (set & TIOCM_DTR)
 855                 priv->line_control |= CONTROL_DTR;
 856         if (clear & TIOCM_RTS)
 857                 priv->line_control &= ~CONTROL_RTS;
 858         if (clear & TIOCM_DTR)
 859                 priv->line_control &= ~CONTROL_DTR;
 860         priv->cmd_ctrl = 1;
 861         spin_unlock_irqrestore(&priv->lock, flags);
 862
 863         return cypress_write(tty, port, NULL, 0);
 864 }
 865
 866 static void cypress_set_termios(struct tty_struct *tty,
 867         struct usb_serial_port *port, struct ktermios *old_termios)
 868 {
 869         struct cypress_private *priv = usb_get_serial_port_data(port);
 870         struct device *dev = &port->dev;
 871         int data_bits, stop_bits, parity_type, parity_enable;
 872         unsigned cflag, iflag;
 873         unsigned long flags;
 874         __u8 oldlines;
 875         int linechange = 0;
 876
 877         spin_lock_irqsave(&priv->lock, flags);
 878         /* We can't clean this one up as we don't know the device type
 879            early enough */
 880         if (!priv->termios_initialized) {
 881                 if (priv->chiptype == CT_EARTHMATE) {
 882                         tty->termios = tty_std_termios;
 883                         tty->termios.c_cflag = B4800 | CS8 | CREAD | HUPCL |
 884                                 CLOCAL;
 885                         tty->termios.c_ispeed = 4800;
 886                         tty->termios.c_ospeed = 4800;
 887                 } else if (priv->chiptype == CT_CYPHIDCOM) {
 888                         tty->termios = tty_std_termios;
 889                         tty->termios.c_cflag = B9600 | CS8 | CREAD | HUPCL |
 890                                 CLOCAL;
 891                         tty->termios.c_ispeed = 9600;
 892                         tty->termios.c_ospeed = 9600;
 893                 } else if (priv->chiptype == CT_CA42V2) {
 894                         tty->termios = tty_std_termios;
 895                         tty->termios.c_cflag = B9600 | CS8 | CREAD | HUPCL |
 896                                 CLOCAL;
 897                         tty->termios.c_ispeed = 9600;
 898                         tty->termios.c_ospeed = 9600;
 899                 }
 900                 priv->termios_initialized = 1;
 901         }
 902         spin_unlock_irqrestore(&priv->lock, flags);
 903
 904         /* Unsupported features need clearing */
 905         tty->termios.c_cflag &= ~(CMSPAR|CRTSCTS);
 906
 907         cflag = tty->termios.c_cflag;
 908         iflag = tty->termios.c_iflag;
 909
 910         /* check if there are new settings */
 911         if (old_termios) {
 912                 spin_lock_irqsave(&priv->lock, flags);
 913                 priv->tmp_termios = tty->termios;
 914                 spin_unlock_irqrestore(&priv->lock, flags);
 915         }
 916
 917         /* set number of data bits, parity, stop bits */
 918         /* when parity is disabled the parity type bit is ignored */
 919
 920         /* 1 means 2 stop bits, 0 means 1 stop bit */
 921         stop_bits = cflag & CSTOPB ? 1 : 0;
 922
 923         if (cflag & PARENB) {
 924                 parity_enable = 1;
 925                 /* 1 means odd parity, 0 means even parity */
 926                 parity_type = cflag & PARODD ? 1 : 0;
 927         } else
 928                 parity_enable = parity_type = 0;
 929
 930         switch (cflag & CSIZE) {
 931         case CS5:
 932                 data_bits = 0;
 933                 break;
 934         case CS6:
 935                 data_bits = 1;
 936                 break;
 937         case CS7:
 938                 data_bits = 2;
 939                 break;
 940         case CS8:
 941                 data_bits = 3;
 942                 break;
 943         default:
 944                 dev_err(dev, "%s - CSIZE was set, but not CS5-CS8\n", __func__);
 945                 data_bits = 3;
 946         }
 947         spin_lock_irqsave(&priv->lock, flags);
 948         oldlines = priv->line_control;
 949         if ((cflag & CBAUD) == B0) {
 950                 /* drop dtr and rts */
 951                 dev_dbg(dev, "%s - dropping the lines, baud rate 0bps\n", __func__);
 952                 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
 953         } else
 954                 priv->line_control = (CONTROL_DTR | CONTROL_RTS);
 955         spin_unlock_irqrestore(&priv->lock, flags);
 956
 957         dev_dbg(dev, "%s - sending %d stop_bits, %d parity_enable, %d parity_type, %d data_bits (+5)\n",
 958                 __func__, stop_bits, parity_enable, parity_type, data_bits);
 959
 960         cypress_serial_control(tty, port, tty_get_baud_rate(tty),
 961                         data_bits, stop_bits,
 962                         parity_enable, parity_type,
 963                         0, CYPRESS_SET_CONFIG);
 964
 965         /* we perform a CYPRESS_GET_CONFIG so that the current settings are
 966          * filled into the private structure this should confirm that all is
 967          * working if it returns what we just set */
 968         cypress_serial_control(tty, port, 0, 0, 0, 0, 0, 0, CYPRESS_GET_CONFIG);
 969
 970         /* Here we can define custom tty settings for devices; the main tty
 971          * termios flag base comes from empeg.c */
 972
 973         spin_lock_irqsave(&priv->lock, flags);
 974         if (priv->chiptype == CT_EARTHMATE && priv->baud_rate == 4800) {
 975                 dev_dbg(dev, "Using custom termios settings for a baud rate of 4800bps.\n");
 976                 /* define custom termios settings for NMEA protocol */
 977
 978                 tty->termios.c_iflag /* input modes - */
 979                         &= ~(IGNBRK  /* disable ignore break */
 980                         | BRKINT     /* disable break causes interrupt */
 981                         | PARMRK     /* disable mark parity errors */
 982                         | ISTRIP     /* disable clear high bit of input char */
 983                         | INLCR      /* disable translate NL to CR */
 984                         | IGNCR      /* disable ignore CR */
 985                         | ICRNL      /* disable translate CR to NL */
 986                         | IXON);     /* disable enable XON/XOFF flow control */
 987
 988                 tty->termios.c_oflag /* output modes */
 989                         &= ~OPOST;    /* disable postprocess output char */
 990
 991                 tty->termios.c_lflag /* line discipline modes */
 992                         &= ~(ECHO     /* disable echo input characters */
 993                         | ECHONL      /* disable echo new line */
 994                         | ICANON      /* disable erase, kill, werase, and rprnt
 995                                          special characters */
 996                         | ISIG        /* disable interrupt, quit, and suspend
 997                                          special characters */
 998                         | IEXTEN);    /* disable non-POSIX special characters */
 999         } /* CT_CYPHIDCOM: Application should handle this for device */
1000
1001         linechange = (priv->line_control != oldlines);
1002         spin_unlock_irqrestore(&priv->lock, flags);
1003
1004         /* if necessary, set lines */
1005         if (linechange) {
1006                 priv->cmd_ctrl = 1;
1007                 cypress_write(tty, port, NULL, 0);
1008         }
1009 } /* cypress_set_termios */
1010
1011
1012 /* returns amount of data still left in soft buffer */
1013 static int cypress_chars_in_buffer(struct tty_struct *tty)
1014 {
1015         struct usb_serial_port *port = tty->driver_data;
1016         struct cypress_private *priv = usb_get_serial_port_data(port);
1017         int chars = 0;
1018         unsigned long flags;
1019
1020         spin_lock_irqsave(&priv->lock, flags);
1021         chars = kfifo_len(&priv->write_fifo);
1022         spin_unlock_irqrestore(&priv->lock, flags);
1023
1024         dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
1025         return chars;
1026 }
1027
1028
1029 static void cypress_throttle(struct tty_struct *tty)
1030 {
1031         struct usb_serial_port *port = tty->driver_data;
1032         struct cypress_private *priv = usb_get_serial_port_data(port);
1033
1034         spin_lock_irq(&priv->lock);
1035         priv->rx_flags = THROTTLED;
1036         spin_unlock_irq(&priv->lock);
1037 }
1038
1039
1040 static void cypress_unthrottle(struct tty_struct *tty)
1041 {
1042         struct usb_serial_port *port = tty->driver_data;
1043         struct cypress_private *priv = usb_get_serial_port_data(port);
1044         int actually_throttled, result;
1045
1046         spin_lock_irq(&priv->lock);
1047         actually_throttled = priv->rx_flags & ACTUALLY_THROTTLED;
1048         priv->rx_flags = 0;
1049         spin_unlock_irq(&priv->lock);
1050
1051         if (!priv->comm_is_ok)
1052                 return;
1053
1054         if (actually_throttled) {
1055                 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
1056                 if (result) {
1057                         dev_err(&port->dev, "%s - failed submitting read urb, "
1058                                         "error %d\n", __func__, result);
1059                         cypress_set_dead(port);
1060                 }
1061         }
1062 }
1063
1064
1065 static void cypress_read_int_callback(struct urb *urb)
1066 {
1067         struct usb_serial_port *port = urb->context;
1068         struct cypress_private *priv = usb_get_serial_port_data(port);
1069         struct device *dev = &urb->dev->dev;
1070         struct tty_struct *tty;
1071         unsigned char *data = urb->transfer_buffer;
1072         unsigned long flags;
1073         char tty_flag = TTY_NORMAL;
1074         int havedata = 0;
1075         int bytes = 0;
1076         int result;
1077         int i = 0;
1078         int status = urb->status;
1079
1080         switch (status) {
1081         case 0: /* success */
1082                 break;
1083         case -ECONNRESET:
1084         case -ENOENT:
1085         case -ESHUTDOWN:
1086                 /* precursor to disconnect so just go away */
1087                 return;
1088         case -EPIPE:
1089                 /* Can't call usb_clear_halt while in_interrupt */
1090                 /* FALLS THROUGH */
1091         default:
1092                 /* something ugly is going on... */
1093                 dev_err(dev, "%s - unexpected nonzero read status received: %d\n",
1094                         __func__, status);
1095                 cypress_set_dead(port);
1096                 return;
1097         }
1098
1099         spin_lock_irqsave(&priv->lock, flags);
1100         if (priv->rx_flags & THROTTLED) {
1101                 dev_dbg(dev, "%s - now throttling\n", __func__);
1102                 priv->rx_flags |= ACTUALLY_THROTTLED;
1103                 spin_unlock_irqrestore(&priv->lock, flags);
1104                 return;
1105         }
1106         spin_unlock_irqrestore(&priv->lock, flags);
1107
1108         tty = tty_port_tty_get(&port->port);
1109         if (!tty) {
1110                 dev_dbg(dev, "%s - bad tty pointer - exiting\n", __func__);
1111                 return;
1112         }
1113
1114         spin_lock_irqsave(&priv->lock, flags);
1115         result = urb->actual_length;
1116         switch (priv->pkt_fmt) {
1117         default:
1118         case packet_format_1:
1119                 /* This is for the CY7C64013... */
1120                 priv->current_status = data[0] & 0xF8;
1121                 bytes = data[1] + 2;
1122                 i = 2;
1123                 if (bytes > 2)
1124                         havedata = 1;
1125                 break;
1126         case packet_format_2:
1127                 /* This is for the CY7C63743... */
1128                 priv->current_status = data[0] & 0xF8;
1129                 bytes = (data[0] & 0x07) + 1;
1130                 i = 1;
1131                 if (bytes > 1)
1132                         havedata = 1;
1133                 break;
1134         }
1135         spin_unlock_irqrestore(&priv->lock, flags);
1136         if (result < bytes) {
1137                 dev_dbg(dev,
1138                         "%s - wrong packet size - received %d bytes but packet said %d bytes\n",
1139                         __func__, result, bytes);
1140                 goto continue_read;
1141         }
1142
1143         usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
1144
1145         spin_lock_irqsave(&priv->lock, flags);
1146         /* check to see if status has changed */
1147         if (priv->current_status != priv->prev_status) {
1148                 u8 delta = priv->current_status ^ priv->prev_status;
1149
1150                 if (delta & UART_MSR_MASK) {
1151                         if (delta & UART_CTS)
1152                                 port->icount.cts++;
1153                         if (delta & UART_DSR)
1154                                 port->icount.dsr++;
1155                         if (delta & UART_RI)
1156                                 port->icount.rng++;
1157                         if (delta & UART_CD)
1158                                 port->icount.dcd++;
1159
1160                         wake_up_interruptible(&port->port.delta_msr_wait);
1161                 }
1162
1163                 priv->prev_status = priv->current_status;
1164         }
1165         spin_unlock_irqrestore(&priv->lock, flags);
1166
1167         /* hangup, as defined in acm.c... this might be a bad place for it
1168          * though */
1169         if (tty && !C_CLOCAL(tty) && !(priv->current_status & UART_CD)) {
1170                 dev_dbg(dev, "%s - calling hangup\n", __func__);
1171                 tty_hangup(tty);
1172                 goto continue_read;
1173         }
1174
1175         /* There is one error bit... I'm assuming it is a parity error
1176          * indicator as the generic firmware will set this bit to 1 if a
1177          * parity error occurs.
1178          * I can not find reference to any other error events. */
1179         spin_lock_irqsave(&priv->lock, flags);
1180         if (priv->current_status & CYP_ERROR) {
1181                 spin_unlock_irqrestore(&priv->lock, flags);
1182                 tty_flag = TTY_PARITY;
1183                 dev_dbg(dev, "%s - Parity Error detected\n", __func__);
1184         } else
1185                 spin_unlock_irqrestore(&priv->lock, flags);
1186
1187         /* process read if there is data other than line status */
1188         if (bytes > i) {
1189                 tty_insert_flip_string_fixed_flag(&port->port, data + i,
1190                                 tty_flag, bytes - i);
1191                 tty_flip_buffer_push(&port->port);
1192         }
1193
1194         spin_lock_irqsave(&priv->lock, flags);
1195         /* control and status byte(s) are also counted */
1196         priv->bytes_in += bytes;
1197         spin_unlock_irqrestore(&priv->lock, flags);
1198
1199 continue_read:
1200         tty_kref_put(tty);
1201
1202         /* Continue trying to always read */
1203
1204         if (priv->comm_is_ok) {
1205                 usb_fill_int_urb(port->interrupt_in_urb, port->serial->dev,
1206                                 usb_rcvintpipe(port->serial->dev,
1207                                         port->interrupt_in_endpointAddress),
1208                                 port->interrupt_in_urb->transfer_buffer,
1209                                 port->interrupt_in_urb->transfer_buffer_length,
1210                                 cypress_read_int_callback, port,
1211                                 priv->read_urb_interval);
1212                 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
1213                 if (result && result != -EPERM) {
1214                         dev_err(dev, "%s - failed resubmitting read urb, error %d\n",
1215                                 __func__, result);
1216                         cypress_set_dead(port);
1217                 }
1218         }
1219 } /* cypress_read_int_callback */
1220
1221
1222 static void cypress_write_int_callback(struct urb *urb)
1223 {
1224         struct usb_serial_port *port = urb->context;
1225         struct cypress_private *priv = usb_get_serial_port_data(port);
1226         struct device *dev = &urb->dev->dev;
1227         int status = urb->status;
1228
1229         switch (status) {
1230         case 0:
1231                 /* success */
1232                 break;
1233         case -ECONNRESET:
1234         case -ENOENT:
1235         case -ESHUTDOWN:
1236                 /* this urb is terminated, clean up */
1237                 dev_dbg(dev, "%s - urb shutting down with status: %d\n",
1238                         __func__, status);
1239                 priv->write_urb_in_use = 0;
1240                 return;
1241         case -EPIPE:
1242                 /* Cannot call usb_clear_halt while in_interrupt */
1243                 /* FALLTHROUGH */
1244         default:
1245                 dev_err(dev, "%s - unexpected nonzero write status received: %d\n",
1246                         __func__, status);
1247                 cypress_set_dead(port);
1248                 break;
1249         }
1250         priv->write_urb_in_use = 0;
1251
1252         /* send any buffered data */
1253         cypress_send(port);
1254 }
1255
1256 module_usb_serial_driver(serial_drivers, id_table_combined);
1257
1258 MODULE_AUTHOR(DRIVER_AUTHOR);
1259 MODULE_DESCRIPTION(DRIVER_DESC);
1260 MODULE_LICENSE("GPL");
1261
1262 module_param(stats, bool, S_IRUGO | S_IWUSR);
1263 MODULE_PARM_DESC(stats, "Enable statistics or not");
1264 module_param(interval, int, S_IRUGO | S_IWUSR);
1265 MODULE_PARM_DESC(interval, "Overrides interrupt interval");
1266 module_param(unstable_bauds, bool, S_IRUGO | S_IWUSR);
1267 MODULE_PARM_DESC(unstable_bauds, "Allow unstable baud rates");