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 stats;
  50 static int interval;
  51 static bool unstable_bauds;
  52
  53 #define DRIVER_AUTHOR "Lonnie Mendez <dignome@gmail.com>, Neil Whelchel <koyama@firstlight.net>"
  54 #define DRIVER_DESC "Cypress USB to Serial Driver"
  55
  56 /* write buffer size defines */
  57 #define CYPRESS_BUF_SIZE        1024
  58
  59 static const struct usb_device_id id_table_earthmate[] = {
  60         { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
  61         { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
  62         { }                                             /* Terminating entry */
  63 };
  64
  65 static const struct usb_device_id id_table_cyphidcomrs232[] = {
  66         { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
  67         { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) },
  68         { }                                             /* Terminating entry */
  69 };
  70
  71 static const struct usb_device_id id_table_nokiaca42v2[] = {
  72         { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
  73         { }                                             /* Terminating entry */
  74 };
  75
  76 static const struct usb_device_id id_table_combined[] = {
  77         { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
  78         { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
  79         { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
  80         { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) },
  81         { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
  82         { }                                             /* Terminating entry */
  83 };
  84
  85 MODULE_DEVICE_TABLE(usb, id_table_combined);
  86
  87 enum packet_format {
  88         packet_format_1,  /* b0:status, b1:payload count */
  89         packet_format_2   /* b0[7:3]:status, b0[2:0]:payload count */
  90 };
  91
  92 struct cypress_private {
  93         spinlock_t lock;                   /* private lock */
  94         int chiptype;                      /* identifier of device, for quirks/etc */
  95         int bytes_in;                      /* used for statistics */
  96         int bytes_out;                     /* used for statistics */
  97         int cmd_count;                     /* used for statistics */
  98         int cmd_ctrl;                      /* always set this to 1 before issuing a command */
  99         struct kfifo write_fifo;           /* write fifo */
 100         int write_urb_in_use;              /* write urb in use indicator */
 101         int write_urb_interval;            /* interval to use for write urb */
 102         int read_urb_interval;             /* interval to use for read urb */
 103         int comm_is_ok;                    /* true if communication is (still) ok */
 104         int termios_initialized;
 105         __u8 line_control;                 /* holds dtr / rts value */
 106         __u8 current_status;               /* received from last read - info on dsr,cts,cd,ri,etc */
 107         __u8 current_config;               /* stores the current configuration byte */
 108         __u8 rx_flags;                     /* throttling - used from whiteheat/ftdi_sio */
 109         enum packet_format pkt_fmt;        /* format to use for packet send / receive */
 110         int get_cfg_unsafe;                /* If true, the CYPRESS_GET_CONFIG is unsafe */
 111         int baud_rate;                     /* stores current baud rate in
 112                                               integer form */
 113         int isthrottled;                   /* if throttled, discard reads */
 114         wait_queue_head_t delta_msr_wait;  /* used for TIOCMIWAIT */
 115         char prev_status, diff_status;     /* used for TIOCMIWAIT */
 116         /* we pass a pointer to this as the argument sent to
 117            cypress_set_termios old_termios */
 118         struct ktermios tmp_termios;       /* stores the old termios settings */
 119 };
 120
 121 /* function prototypes for the Cypress USB to serial device */
 122 static int  cypress_earthmate_port_probe(struct usb_serial_port *port);
 123 static int  cypress_hidcom_port_probe(struct usb_serial_port *port);
 124 static int  cypress_ca42v2_port_probe(struct usb_serial_port *port);
 125 static int  cypress_port_remove(struct usb_serial_port *port);
 126 static int  cypress_open(struct tty_struct *tty, struct usb_serial_port *port);
 127 static void cypress_close(struct usb_serial_port *port);
 128 static void cypress_dtr_rts(struct usb_serial_port *port, int on);
 129 static int  cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
 130                         const unsigned char *buf, int count);
 131 static void cypress_send(struct usb_serial_port *port);
 132 static int  cypress_write_room(struct tty_struct *tty);
 133 static int  cypress_ioctl(struct tty_struct *tty,
 134                         unsigned int cmd, unsigned long arg);
 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         .ioctl =                        cypress_ioctl,
 163         .set_termios =                  cypress_set_termios,
 164         .tiocmget =                     cypress_tiocmget,
 165         .tiocmset =                     cypress_tiocmset,
 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         .ioctl =                        cypress_ioctl,
 189         .set_termios =                  cypress_set_termios,
 190         .tiocmget =                     cypress_tiocmget,
 191         .tiocmset =                     cypress_tiocmset,
 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         .ioctl =                        cypress_ioctl,
 215         .set_termios =                  cypress_set_termios,
 216         .tiocmget =                     cypress_tiocmget,
 217         .tiocmset =                     cypress_tiocmset,
 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
 235 static int analyze_baud_rate(struct usb_serial_port *port, speed_t new_rate)
 236 {
 237         struct cypress_private *priv;
 238         priv = usb_get_serial_port_data(port);
 239
 240         if (unstable_bauds)
 241                 return new_rate;
 242
 243         /*
 244          * The general purpose firmware for the Cypress M8 allows for
 245          * a maximum speed of 57600bps (I have no idea whether DeLorme
 246          * chose to use the general purpose firmware or not), if you
 247          * need to modify this speed setting for your own project
 248          * please add your own chiptype and modify the code likewise.
 249          * The Cypress HID->COM device will work successfully up to
 250          * 115200bps (but the actual throughput is around 3kBps).
 251          */
 252         if (port->serial->dev->speed == USB_SPEED_LOW) {
 253                 /*
 254                  * Mike Isely <isely@pobox.com> 2-Feb-2008: The
 255                  * Cypress app note that describes this mechanism
 256                  * states the the low-speed part can't handle more
 257                  * than 800 bytes/sec, in which case 4800 baud is the
 258                  * safest speed for a part like that.
 259                  */
 260                 if (new_rate > 4800) {
 261                         dev_dbg(&port->dev,
 262                                 "%s - failed setting baud rate, device incapable speed %d\n",
 263                                 __func__, new_rate);
 264                         return -1;
 265                 }
 266         }
 267         switch (priv->chiptype) {
 268         case CT_EARTHMATE:
 269                 if (new_rate <= 600) {
 270                         /* 300 and 600 baud rates are supported under
 271                          * the generic firmware, but are not used with
 272                          * NMEA and SiRF protocols */
 273                         dev_dbg(&port->dev,
 274                                 "%s - failed setting baud rate, unsupported speed of %d on Earthmate GPS",
 275                                 __func__, new_rate);
 276                         return -1;
 277                 }
 278                 break;
 279         default:
 280                 break;
 281         }
 282         return new_rate;
 283 }
 284
 285
 286 /* This function can either set or retrieve the current serial line settings */
 287 static int cypress_serial_control(struct tty_struct *tty,
 288         struct usb_serial_port *port, speed_t baud_rate, int data_bits,
 289         int stop_bits, int parity_enable, int parity_type, int reset,
 290         int cypress_request_type)
 291 {
 292         int new_baudrate = 0, retval = 0, tries = 0;
 293         struct cypress_private *priv;
 294         struct device *dev = &port->dev;
 295         u8 *feature_buffer;
 296         const unsigned int feature_len = 5;
 297         unsigned long flags;
 298
 299         priv = usb_get_serial_port_data(port);
 300
 301         if (!priv->comm_is_ok)
 302                 return -ENODEV;
 303
 304         feature_buffer = kcalloc(feature_len, sizeof(u8), GFP_KERNEL);
 305         if (!feature_buffer)
 306                 return -ENOMEM;
 307
 308         switch (cypress_request_type) {
 309         case CYPRESS_SET_CONFIG:
 310                 /* 0 means 'Hang up' so doesn't change the true bit rate */
 311                 new_baudrate = priv->baud_rate;
 312                 if (baud_rate && baud_rate != priv->baud_rate) {
 313                         dev_dbg(dev, "%s - baud rate is changing\n", __func__);
 314                         retval = analyze_baud_rate(port, baud_rate);
 315                         if (retval >= 0) {
 316                                 new_baudrate = retval;
 317                                 dev_dbg(dev, "%s - New baud rate set to %d\n",
 318                                         __func__, new_baudrate);
 319                         }
 320                 }
 321                 dev_dbg(dev, "%s - baud rate is being sent as %d\n", __func__,
 322                         new_baudrate);
 323
 324                 /* fill the feature_buffer with new configuration */
 325                 put_unaligned_le32(new_baudrate, feature_buffer);
 326                 feature_buffer[4] |= data_bits;   /* assign data bits in 2 bit space ( max 3 ) */
 327                 /* 1 bit gap */
 328                 feature_buffer[4] |= (stop_bits << 3);   /* assign stop bits in 1 bit space */
 329                 feature_buffer[4] |= (parity_enable << 4);   /* assign parity flag in 1 bit space */
 330                 feature_buffer[4] |= (parity_type << 5);   /* assign parity type in 1 bit space */
 331                 /* 1 bit gap */
 332                 feature_buffer[4] |= (reset << 7);   /* assign reset at end of byte, 1 bit space */
 333
 334                 dev_dbg(dev, "%s - device is being sent this feature report:\n", __func__);
 335                 dev_dbg(dev, "%s - %02X - %02X - %02X - %02X - %02X\n", __func__,
 336                         feature_buffer[0], feature_buffer[1],
 337                         feature_buffer[2], feature_buffer[3],
 338                         feature_buffer[4]);
 339
 340                 do {
 341                         retval = usb_control_msg(port->serial->dev,
 342                                         usb_sndctrlpipe(port->serial->dev, 0),
 343                                         HID_REQ_SET_REPORT,
 344                                         USB_DIR_OUT | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
 345                                         0x0300, 0, feature_buffer,
 346                                         feature_len, 500);
 347
 348                         if (tries++ >= 3)
 349                                 break;
 350
 351                 } while (retval != feature_len &&
 352                          retval != -ENODEV);
 353
 354                 if (retval != feature_len) {
 355                         dev_err(dev, "%s - failed sending serial line settings - %d\n",
 356                                 __func__, retval);
 357                         cypress_set_dead(port);
 358                 } else {
 359                         spin_lock_irqsave(&priv->lock, flags);
 360                         priv->baud_rate = new_baudrate;
 361                         priv->current_config = feature_buffer[4];
 362                         spin_unlock_irqrestore(&priv->lock, flags);
 363                         /* If we asked for a speed change encode it */
 364                         if (baud_rate)
 365                                 tty_encode_baud_rate(tty,
 366                                         new_baudrate, new_baudrate);
 367                 }
 368         break;
 369         case CYPRESS_GET_CONFIG:
 370                 if (priv->get_cfg_unsafe) {
 371                         /* Not implemented for this device,
 372                            and if we try to do it we're likely
 373                            to crash the hardware. */
 374                         retval = -ENOTTY;
 375                         goto out;
 376                 }
 377                 dev_dbg(dev, "%s - retreiving serial line settings\n", __func__);
 378                 do {
 379                         retval = usb_control_msg(port->serial->dev,
 380                                         usb_rcvctrlpipe(port->serial->dev, 0),
 381                                         HID_REQ_GET_REPORT,
 382                                         USB_DIR_IN | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
 383                                         0x0300, 0, feature_buffer,
 384                                         feature_len, 500);
 385
 386                         if (tries++ >= 3)
 387                                 break;
 388                 } while (retval != feature_len
 389                                                 && retval != -ENODEV);
 390
 391                 if (retval != feature_len) {
 392                         dev_err(dev, "%s - failed to retrieve serial line settings - %d\n",
 393                                 __func__, retval);
 394                         cypress_set_dead(port);
 395                         goto out;
 396                 } else {
 397                         spin_lock_irqsave(&priv->lock, flags);
 398                         /* store the config in one byte, and later
 399                            use bit masks to check values */
 400                         priv->current_config = feature_buffer[4];
 401                         priv->baud_rate = get_unaligned_le32(feature_buffer);
 402                         spin_unlock_irqrestore(&priv->lock, flags);
 403                 }
 404         }
 405         spin_lock_irqsave(&priv->lock, flags);
 406         ++priv->cmd_count;
 407         spin_unlock_irqrestore(&priv->lock, flags);
 408 out:
 409         kfree(feature_buffer);
 410         return retval;
 411 } /* cypress_serial_control */
 412
 413
 414 static void cypress_set_dead(struct usb_serial_port *port)
 415 {
 416         struct cypress_private *priv = usb_get_serial_port_data(port);
 417         unsigned long flags;
 418
 419         spin_lock_irqsave(&priv->lock, flags);
 420         if (!priv->comm_is_ok) {
 421                 spin_unlock_irqrestore(&priv->lock, flags);
 422                 return;
 423         }
 424         priv->comm_is_ok = 0;
 425         spin_unlock_irqrestore(&priv->lock, flags);
 426
 427         dev_err(&port->dev, "cypress_m8 suspending failing port %d - "
 428                 "interval might be too short\n", port->number);
 429 }
 430
 431
 432 /*****************************************************************************
 433  * Cypress serial driver functions
 434  *****************************************************************************/
 435
 436
 437 static int cypress_generic_port_probe(struct usb_serial_port *port)
 438 {
 439         struct usb_serial *serial = port->serial;
 440         struct cypress_private *priv;
 441
 442         priv = kzalloc(sizeof(struct cypress_private), GFP_KERNEL);
 443         if (!priv)
 444                 return -ENOMEM;
 445
 446         priv->comm_is_ok = !0;
 447         spin_lock_init(&priv->lock);
 448         if (kfifo_alloc(&priv->write_fifo, CYPRESS_BUF_SIZE, GFP_KERNEL)) {
 449                 kfree(priv);
 450                 return -ENOMEM;
 451         }
 452         init_waitqueue_head(&priv->delta_msr_wait);
 453
 454         usb_reset_configuration(serial->dev);
 455
 456         priv->cmd_ctrl = 0;
 457         priv->line_control = 0;
 458         priv->termios_initialized = 0;
 459         priv->rx_flags = 0;
 460         /* Default packet format setting is determined by packet size.
 461            Anything with a size larger then 9 must have a separate
 462            count field since the 3 bit count field is otherwise too
 463            small.  Otherwise we can use the slightly more compact
 464            format.  This is in accordance with the cypress_m8 serial
 465            converter app note. */
 466         if (port->interrupt_out_size > 9)
 467                 priv->pkt_fmt = packet_format_1;
 468         else
 469                 priv->pkt_fmt = packet_format_2;
 470
 471         if (interval > 0) {
 472                 priv->write_urb_interval = interval;
 473                 priv->read_urb_interval = interval;
 474                 dev_dbg(&port->dev, "%s - read & write intervals forced to %d\n",
 475                         __func__, interval);
 476         } else {
 477                 priv->write_urb_interval = port->interrupt_out_urb->interval;
 478                 priv->read_urb_interval = port->interrupt_in_urb->interval;
 479                 dev_dbg(&port->dev, "%s - intervals: read=%d write=%d\n",
 480                         __func__, priv->read_urb_interval,
 481                         priv->write_urb_interval);
 482         }
 483         usb_set_serial_port_data(port, priv);
 484
 485         return 0;
 486 }
 487
 488
 489 static int cypress_earthmate_port_probe(struct usb_serial_port *port)
 490 {
 491         struct usb_serial *serial = port->serial;
 492         struct cypress_private *priv;
 493         int ret;
 494
 495         ret = cypress_generic_port_probe(port);
 496         if (ret) {
 497                 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
 498                 return ret;
 499         }
 500
 501         priv = usb_get_serial_port_data(port);
 502         priv->chiptype = CT_EARTHMATE;
 503         /* All Earthmate devices use the separated-count packet
 504            format!  Idiotic. */
 505         priv->pkt_fmt = packet_format_1;
 506         if (serial->dev->descriptor.idProduct !=
 507                                 cpu_to_le16(PRODUCT_ID_EARTHMATEUSB)) {
 508                 /* The old original USB Earthmate seemed able to
 509                    handle GET_CONFIG requests; everything they've
 510                    produced since that time crashes if this command is
 511                    attempted :-( */
 512                 dev_dbg(&port->dev,
 513                         "%s - Marking this device as unsafe for GET_CONFIG commands\n",
 514                         __func__);
 515                 priv->get_cfg_unsafe = !0;
 516         }
 517
 518         return 0;
 519 }
 520
 521 static int cypress_hidcom_port_probe(struct usb_serial_port *port)
 522 {
 523         struct cypress_private *priv;
 524         int ret;
 525
 526         ret = cypress_generic_port_probe(port);
 527         if (ret) {
 528                 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
 529                 return ret;
 530         }
 531
 532         priv = usb_get_serial_port_data(port);
 533         priv->chiptype = CT_CYPHIDCOM;
 534
 535         return 0;
 536 }
 537
 538 static int cypress_ca42v2_port_probe(struct usb_serial_port *port)
 539 {
 540         struct cypress_private *priv;
 541         int ret;
 542
 543         ret = cypress_generic_port_probe(port);
 544         if (ret) {
 545                 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
 546                 return ret;
 547         }
 548
 549         priv = usb_get_serial_port_data(port);
 550         priv->chiptype = CT_CA42V2;
 551
 552         return 0;
 553 }
 554
 555 static int cypress_port_remove(struct usb_serial_port *port)
 556 {
 557         struct cypress_private *priv;
 558
 559         priv = usb_get_serial_port_data(port);
 560
 561         kfifo_free(&priv->write_fifo);
 562         kfree(priv);
 563
 564         return 0;
 565 }
 566
 567 static int cypress_open(struct tty_struct *tty, struct usb_serial_port *port)
 568 {
 569         struct cypress_private *priv = usb_get_serial_port_data(port);
 570         struct usb_serial *serial = port->serial;
 571         unsigned long flags;
 572         int result = 0;
 573
 574         if (!priv->comm_is_ok)
 575                 return -EIO;
 576
 577         /* clear halts before open */
 578         usb_clear_halt(serial->dev, 0x81);
 579         usb_clear_halt(serial->dev, 0x02);
 580
 581         spin_lock_irqsave(&priv->lock, flags);
 582         /* reset read/write statistics */
 583         priv->bytes_in = 0;
 584         priv->bytes_out = 0;
 585         priv->cmd_count = 0;
 586         priv->rx_flags = 0;
 587         spin_unlock_irqrestore(&priv->lock, flags);
 588
 589         /* Set termios */
 590         cypress_send(port);
 591
 592         if (tty)
 593                 cypress_set_termios(tty, port, &priv->tmp_termios);
 594
 595         /* setup the port and start reading from the device */
 596         if (!port->interrupt_in_urb) {
 597                 dev_err(&port->dev, "%s - interrupt_in_urb is empty!\n",
 598                         __func__);
 599                 return -1;
 600         }
 601
 602         usb_fill_int_urb(port->interrupt_in_urb, serial->dev,
 603                 usb_rcvintpipe(serial->dev, port->interrupt_in_endpointAddress),
 604                 port->interrupt_in_urb->transfer_buffer,
 605                 port->interrupt_in_urb->transfer_buffer_length,
 606                 cypress_read_int_callback, port, priv->read_urb_interval);
 607         result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
 608
 609         if (result) {
 610                 dev_err(&port->dev,
 611                         "%s - failed submitting read urb, error %d\n",
 612                                                         __func__, result);
 613                 cypress_set_dead(port);
 614         }
 615         port->port.drain_delay = 256;
 616         return result;
 617 } /* cypress_open */
 618
 619 static void cypress_dtr_rts(struct usb_serial_port *port, int on)
 620 {
 621         struct cypress_private *priv = usb_get_serial_port_data(port);
 622         /* drop dtr and rts */
 623         spin_lock_irq(&priv->lock);
 624         if (on == 0)
 625                 priv->line_control = 0;
 626         else
 627                 priv->line_control = CONTROL_DTR | CONTROL_RTS;
 628         priv->cmd_ctrl = 1;
 629         spin_unlock_irq(&priv->lock);
 630         cypress_write(NULL, port, NULL, 0);
 631 }
 632
 633 static void cypress_close(struct usb_serial_port *port)
 634 {
 635         struct cypress_private *priv = usb_get_serial_port_data(port);
 636         unsigned long flags;
 637
 638         /* writing is potentially harmful, lock must be taken */
 639         mutex_lock(&port->serial->disc_mutex);
 640         if (port->serial->disconnected) {
 641                 mutex_unlock(&port->serial->disc_mutex);
 642                 return;
 643         }
 644         spin_lock_irqsave(&priv->lock, flags);
 645         kfifo_reset_out(&priv->write_fifo);
 646         spin_unlock_irqrestore(&priv->lock, flags);
 647
 648         dev_dbg(&port->dev, "%s - stopping urbs\n", __func__);
 649         usb_kill_urb(port->interrupt_in_urb);
 650         usb_kill_urb(port->interrupt_out_urb);
 651
 652         if (stats)
 653                 dev_info(&port->dev, "Statistics: %d Bytes In | %d Bytes Out | %d Commands Issued\n",
 654                         priv->bytes_in, priv->bytes_out, priv->cmd_count);
 655         mutex_unlock(&port->serial->disc_mutex);
 656 } /* cypress_close */
 657
 658
 659 static int cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
 660                                         const unsigned char *buf, int count)
 661 {
 662         struct cypress_private *priv = usb_get_serial_port_data(port);
 663
 664         dev_dbg(&port->dev, "%s - port %d, %d bytes\n", __func__, port->number, count);
 665
 666         /* line control commands, which need to be executed immediately,
 667            are not put into the buffer for obvious reasons.
 668          */
 669         if (priv->cmd_ctrl) {
 670                 count = 0;
 671                 goto finish;
 672         }
 673
 674         if (!count)
 675                 return count;
 676
 677         count = kfifo_in_locked(&priv->write_fifo, buf, count, &priv->lock);
 678
 679 finish:
 680         cypress_send(port);
 681
 682         return count;
 683 } /* cypress_write */
 684
 685
 686 static void cypress_send(struct usb_serial_port *port)
 687 {
 688         int count = 0, result, offset, actual_size;
 689         struct cypress_private *priv = usb_get_serial_port_data(port);
 690         struct device *dev = &port->dev;
 691         unsigned long flags;
 692
 693         if (!priv->comm_is_ok)
 694                 return;
 695
 696         dev_dbg(dev, "%s - interrupt out size is %d\n", __func__,
 697                 port->interrupt_out_size);
 698
 699         spin_lock_irqsave(&priv->lock, flags);
 700         if (priv->write_urb_in_use) {
 701                 dev_dbg(dev, "%s - can't write, urb in use\n", __func__);
 702                 spin_unlock_irqrestore(&priv->lock, flags);
 703                 return;
 704         }
 705         spin_unlock_irqrestore(&priv->lock, flags);
 706
 707         /* clear buffer */
 708         memset(port->interrupt_out_urb->transfer_buffer, 0,
 709                                                 port->interrupt_out_size);
 710
 711         spin_lock_irqsave(&priv->lock, flags);
 712         switch (priv->pkt_fmt) {
 713         default:
 714         case packet_format_1:
 715                 /* this is for the CY7C64013... */
 716                 offset = 2;
 717                 port->interrupt_out_buffer[0] = priv->line_control;
 718                 break;
 719         case packet_format_2:
 720                 /* this is for the CY7C63743... */
 721                 offset = 1;
 722                 port->interrupt_out_buffer[0] = priv->line_control;
 723                 break;
 724         }
 725
 726         if (priv->line_control & CONTROL_RESET)
 727                 priv->line_control &= ~CONTROL_RESET;
 728
 729         if (priv->cmd_ctrl) {
 730                 priv->cmd_count++;
 731                 dev_dbg(dev, "%s - line control command being issued\n", __func__);
 732                 spin_unlock_irqrestore(&priv->lock, flags);
 733                 goto send;
 734         } else
 735                 spin_unlock_irqrestore(&priv->lock, flags);
 736
 737         count = kfifo_out_locked(&priv->write_fifo,
 738                                         &port->interrupt_out_buffer[offset],
 739                                         port->interrupt_out_size - offset,
 740                                         &priv->lock);
 741         if (count == 0)
 742                 return;
 743
 744         switch (priv->pkt_fmt) {
 745         default:
 746         case packet_format_1:
 747                 port->interrupt_out_buffer[1] = count;
 748                 break;
 749         case packet_format_2:
 750                 port->interrupt_out_buffer[0] |= count;
 751         }
 752
 753         dev_dbg(dev, "%s - count is %d\n", __func__, count);
 754
 755 send:
 756         spin_lock_irqsave(&priv->lock, flags);
 757         priv->write_urb_in_use = 1;
 758         spin_unlock_irqrestore(&priv->lock, flags);
 759
 760         if (priv->cmd_ctrl)
 761                 actual_size = 1;
 762         else
 763                 actual_size = count +
 764                               (priv->pkt_fmt == packet_format_1 ? 2 : 1);
 765
 766         usb_serial_debug_data(dev, __func__, port->interrupt_out_size,
 767                               port->interrupt_out_urb->transfer_buffer);
 768
 769         usb_fill_int_urb(port->interrupt_out_urb, port->serial->dev,
 770                 usb_sndintpipe(port->serial->dev, port->interrupt_out_endpointAddress),
 771                 port->interrupt_out_buffer, port->interrupt_out_size,
 772                 cypress_write_int_callback, port, priv->write_urb_interval);
 773         result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC);
 774         if (result) {
 775                 dev_err_console(port,
 776                                 "%s - failed submitting write urb, error %d\n",
 777                                                         __func__, result);
 778                 priv->write_urb_in_use = 0;
 779                 cypress_set_dead(port);
 780         }
 781
 782         spin_lock_irqsave(&priv->lock, flags);
 783         if (priv->cmd_ctrl)
 784                 priv->cmd_ctrl = 0;
 785
 786         /* do not count the line control and size bytes */
 787         priv->bytes_out += count;
 788         spin_unlock_irqrestore(&priv->lock, flags);
 789
 790         usb_serial_port_softint(port);
 791 } /* cypress_send */
 792
 793
 794 /* returns how much space is available in the soft buffer */
 795 static int cypress_write_room(struct tty_struct *tty)
 796 {
 797         struct usb_serial_port *port = tty->driver_data;
 798         struct cypress_private *priv = usb_get_serial_port_data(port);
 799         int room = 0;
 800         unsigned long flags;
 801
 802         spin_lock_irqsave(&priv->lock, flags);
 803         room = kfifo_avail(&priv->write_fifo);
 804         spin_unlock_irqrestore(&priv->lock, flags);
 805
 806         dev_dbg(&port->dev, "%s - returns %d\n", __func__, room);
 807         return room;
 808 }
 809
 810
 811 static int cypress_tiocmget(struct tty_struct *tty)
 812 {
 813         struct usb_serial_port *port = tty->driver_data;
 814         struct cypress_private *priv = usb_get_serial_port_data(port);
 815         __u8 status, control;
 816         unsigned int result = 0;
 817         unsigned long flags;
 818
 819         spin_lock_irqsave(&priv->lock, flags);
 820         control = priv->line_control;
 821         status = priv->current_status;
 822         spin_unlock_irqrestore(&priv->lock, flags);
 823
 824         result = ((control & CONTROL_DTR)        ? TIOCM_DTR : 0)
 825                 | ((control & CONTROL_RTS)       ? TIOCM_RTS : 0)
 826                 | ((status & UART_CTS)        ? TIOCM_CTS : 0)
 827                 | ((status & UART_DSR)        ? TIOCM_DSR : 0)
 828                 | ((status & UART_RI)         ? TIOCM_RI  : 0)
 829                 | ((status & UART_CD)         ? TIOCM_CD  : 0);
 830
 831         dev_dbg(&port->dev, "%s - result = %x\n", __func__, result);
 832
 833         return result;
 834 }
 835
 836
 837 static int cypress_tiocmset(struct tty_struct *tty,
 838                                unsigned int set, unsigned int clear)
 839 {
 840         struct usb_serial_port *port = tty->driver_data;
 841         struct cypress_private *priv = usb_get_serial_port_data(port);
 842         unsigned long flags;
 843
 844         spin_lock_irqsave(&priv->lock, flags);
 845         if (set & TIOCM_RTS)
 846                 priv->line_control |= CONTROL_RTS;
 847         if (set & TIOCM_DTR)
 848                 priv->line_control |= CONTROL_DTR;
 849         if (clear & TIOCM_RTS)
 850                 priv->line_control &= ~CONTROL_RTS;
 851         if (clear & TIOCM_DTR)
 852                 priv->line_control &= ~CONTROL_DTR;
 853         priv->cmd_ctrl = 1;
 854         spin_unlock_irqrestore(&priv->lock, flags);
 855
 856         return cypress_write(tty, port, NULL, 0);
 857 }
 858
 859
 860 static int cypress_ioctl(struct tty_struct *tty,
 861                                         unsigned int cmd, unsigned long arg)
 862 {
 863         struct usb_serial_port *port = tty->driver_data;
 864         struct cypress_private *priv = usb_get_serial_port_data(port);
 865
 866         dev_dbg(&port->dev, "%s - port %d, cmd 0x%.4x\n", __func__, port->number, cmd);
 867
 868         switch (cmd) {
 869         /* This code comes from drivers/char/serial.c and ftdi_sio.c */
 870         case TIOCMIWAIT:
 871                 while (priv != NULL) {
 872                         interruptible_sleep_on(&priv->delta_msr_wait);
 873                         /* see if a signal did it */
 874                         if (signal_pending(current))
 875                                 return -ERESTARTSYS;
 876                         else {
 877                                 char diff = priv->diff_status;
 878                                 if (diff == 0)
 879                                         return -EIO; /* no change => error */
 880
 881                                 /* consume all events */
 882                                 priv->diff_status = 0;
 883
 884                                 /* return 0 if caller wanted to know about
 885                                    these bits */
 886                                 if (((arg & TIOCM_RNG) && (diff & UART_RI)) ||
 887                                     ((arg & TIOCM_DSR) && (diff & UART_DSR)) ||
 888                                     ((arg & TIOCM_CD) && (diff & UART_CD)) ||
 889                                     ((arg & TIOCM_CTS) && (diff & UART_CTS)))
 890                                         return 0;
 891                                 /* otherwise caller can't care less about what
 892                                  * happened, and so we continue to wait for
 893                                  * more events.
 894                                  */
 895                         }
 896                 }
 897                 return 0;
 898         default:
 899                 break;
 900         }
 901         dev_dbg(&port->dev, "%s - arg not supported - it was 0x%04x - check include/asm/ioctls.h\n", __func__, cmd);
 902         return -ENOIOCTLCMD;
 903 } /* cypress_ioctl */
 904
 905
 906 static void cypress_set_termios(struct tty_struct *tty,
 907         struct usb_serial_port *port, struct ktermios *old_termios)
 908 {
 909         struct cypress_private *priv = usb_get_serial_port_data(port);
 910         struct device *dev = &port->dev;
 911         int data_bits, stop_bits, parity_type, parity_enable;
 912         unsigned cflag, iflag;
 913         unsigned long flags;
 914         __u8 oldlines;
 915         int linechange = 0;
 916
 917         spin_lock_irqsave(&priv->lock, flags);
 918         /* We can't clean this one up as we don't know the device type
 919            early enough */
 920         if (!priv->termios_initialized) {
 921                 if (priv->chiptype == CT_EARTHMATE) {
 922                         tty->termios = tty_std_termios;
 923                         tty->termios.c_cflag = B4800 | CS8 | CREAD | HUPCL |
 924                                 CLOCAL;
 925                         tty->termios.c_ispeed = 4800;
 926                         tty->termios.c_ospeed = 4800;
 927                 } else if (priv->chiptype == CT_CYPHIDCOM) {
 928                         tty->termios = tty_std_termios;
 929                         tty->termios.c_cflag = B9600 | CS8 | CREAD | HUPCL |
 930                                 CLOCAL;
 931                         tty->termios.c_ispeed = 9600;
 932                         tty->termios.c_ospeed = 9600;
 933                 } else if (priv->chiptype == CT_CA42V2) {
 934                         tty->termios = tty_std_termios;
 935                         tty->termios.c_cflag = B9600 | CS8 | CREAD | HUPCL |
 936                                 CLOCAL;
 937                         tty->termios.c_ispeed = 9600;
 938                         tty->termios.c_ospeed = 9600;
 939                 }
 940                 priv->termios_initialized = 1;
 941         }
 942         spin_unlock_irqrestore(&priv->lock, flags);
 943
 944         /* Unsupported features need clearing */
 945         tty->termios.c_cflag &= ~(CMSPAR|CRTSCTS);
 946
 947         cflag = tty->termios.c_cflag;
 948         iflag = tty->termios.c_iflag;
 949
 950         /* check if there are new settings */
 951         if (old_termios) {
 952                 spin_lock_irqsave(&priv->lock, flags);
 953                 priv->tmp_termios = tty->termios;
 954                 spin_unlock_irqrestore(&priv->lock, flags);
 955         }
 956
 957         /* set number of data bits, parity, stop bits */
 958         /* when parity is disabled the parity type bit is ignored */
 959
 960         /* 1 means 2 stop bits, 0 means 1 stop bit */
 961         stop_bits = cflag & CSTOPB ? 1 : 0;
 962
 963         if (cflag & PARENB) {
 964                 parity_enable = 1;
 965                 /* 1 means odd parity, 0 means even parity */
 966                 parity_type = cflag & PARODD ? 1 : 0;
 967         } else
 968                 parity_enable = parity_type = 0;
 969
 970         switch (cflag & CSIZE) {
 971         case CS5:
 972                 data_bits = 0;
 973                 break;
 974         case CS6:
 975                 data_bits = 1;
 976                 break;
 977         case CS7:
 978                 data_bits = 2;
 979                 break;
 980         case CS8:
 981                 data_bits = 3;
 982                 break;
 983         default:
 984                 dev_err(dev, "%s - CSIZE was set, but not CS5-CS8\n", __func__);
 985                 data_bits = 3;
 986         }
 987         spin_lock_irqsave(&priv->lock, flags);
 988         oldlines = priv->line_control;
 989         if ((cflag & CBAUD) == B0) {
 990                 /* drop dtr and rts */
 991                 dev_dbg(dev, "%s - dropping the lines, baud rate 0bps\n", __func__);
 992                 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
 993         } else
 994                 priv->line_control = (CONTROL_DTR | CONTROL_RTS);
 995         spin_unlock_irqrestore(&priv->lock, flags);
 996
 997         dev_dbg(dev, "%s - sending %d stop_bits, %d parity_enable, %d parity_type, %d data_bits (+5)\n",
 998                 __func__, stop_bits, parity_enable, parity_type, data_bits);
 999
1000         cypress_serial_control(tty, port, tty_get_baud_rate(tty),
1001                         data_bits, stop_bits,
1002                         parity_enable, parity_type,
1003                         0, CYPRESS_SET_CONFIG);
1004
1005         /* we perform a CYPRESS_GET_CONFIG so that the current settings are
1006          * filled into the private structure this should confirm that all is
1007          * working if it returns what we just set */
1008         cypress_serial_control(tty, port, 0, 0, 0, 0, 0, 0, CYPRESS_GET_CONFIG);
1009
1010         /* Here we can define custom tty settings for devices; the main tty
1011          * termios flag base comes from empeg.c */
1012
1013         spin_lock_irqsave(&priv->lock, flags);
1014         if (priv->chiptype == CT_EARTHMATE && priv->baud_rate == 4800) {
1015                 dev_dbg(dev, "Using custom termios settings for a baud rate of 4800bps.\n");
1016                 /* define custom termios settings for NMEA protocol */
1017
1018                 tty->termios.c_iflag /* input modes - */
1019                         &= ~(IGNBRK  /* disable ignore break */
1020                         | BRKINT     /* disable break causes interrupt */
1021                         | PARMRK     /* disable mark parity errors */
1022                         | ISTRIP     /* disable clear high bit of input char */
1023                         | INLCR      /* disable translate NL to CR */
1024                         | IGNCR      /* disable ignore CR */
1025                         | ICRNL      /* disable translate CR to NL */
1026                         | IXON);     /* disable enable XON/XOFF flow control */
1027
1028                 tty->termios.c_oflag /* output modes */
1029                         &= ~OPOST;    /* disable postprocess output char */
1030
1031                 tty->termios.c_lflag /* line discipline modes */
1032                         &= ~(ECHO     /* disable echo input characters */
1033                         | ECHONL      /* disable echo new line */
1034                         | ICANON      /* disable erase, kill, werase, and rprnt
1035                                          special characters */
1036                         | ISIG        /* disable interrupt, quit, and suspend
1037                                          special characters */
1038                         | IEXTEN);    /* disable non-POSIX special characters */
1039         } /* CT_CYPHIDCOM: Application should handle this for device */
1040
1041         linechange = (priv->line_control != oldlines);
1042         spin_unlock_irqrestore(&priv->lock, flags);
1043
1044         /* if necessary, set lines */
1045         if (linechange) {
1046                 priv->cmd_ctrl = 1;
1047                 cypress_write(tty, port, NULL, 0);
1048         }
1049 } /* cypress_set_termios */
1050
1051
1052 /* returns amount of data still left in soft buffer */
1053 static int cypress_chars_in_buffer(struct tty_struct *tty)
1054 {
1055         struct usb_serial_port *port = tty->driver_data;
1056         struct cypress_private *priv = usb_get_serial_port_data(port);
1057         int chars = 0;
1058         unsigned long flags;
1059
1060         spin_lock_irqsave(&priv->lock, flags);
1061         chars = kfifo_len(&priv->write_fifo);
1062         spin_unlock_irqrestore(&priv->lock, flags);
1063
1064         dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
1065         return chars;
1066 }
1067
1068
1069 static void cypress_throttle(struct tty_struct *tty)
1070 {
1071         struct usb_serial_port *port = tty->driver_data;
1072         struct cypress_private *priv = usb_get_serial_port_data(port);
1073
1074         spin_lock_irq(&priv->lock);
1075         priv->rx_flags = THROTTLED;
1076         spin_unlock_irq(&priv->lock);
1077 }
1078
1079
1080 static void cypress_unthrottle(struct tty_struct *tty)
1081 {
1082         struct usb_serial_port *port = tty->driver_data;
1083         struct cypress_private *priv = usb_get_serial_port_data(port);
1084         int actually_throttled, result;
1085
1086         spin_lock_irq(&priv->lock);
1087         actually_throttled = priv->rx_flags & ACTUALLY_THROTTLED;
1088         priv->rx_flags = 0;
1089         spin_unlock_irq(&priv->lock);
1090
1091         if (!priv->comm_is_ok)
1092                 return;
1093
1094         if (actually_throttled) {
1095                 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
1096                 if (result) {
1097                         dev_err(&port->dev, "%s - failed submitting read urb, "
1098                                         "error %d\n", __func__, result);
1099                         cypress_set_dead(port);
1100                 }
1101         }
1102 }
1103
1104
1105 static void cypress_read_int_callback(struct urb *urb)
1106 {
1107         struct usb_serial_port *port = urb->context;
1108         struct cypress_private *priv = usb_get_serial_port_data(port);
1109         struct device *dev = &urb->dev->dev;
1110         struct tty_struct *tty;
1111         unsigned char *data = urb->transfer_buffer;
1112         unsigned long flags;
1113         char tty_flag = TTY_NORMAL;
1114         int havedata = 0;
1115         int bytes = 0;
1116         int result;
1117         int i = 0;
1118         int status = urb->status;
1119
1120         switch (status) {
1121         case 0: /* success */
1122                 break;
1123         case -ECONNRESET:
1124         case -ENOENT:
1125         case -ESHUTDOWN:
1126                 /* precursor to disconnect so just go away */
1127                 return;
1128         case -EPIPE:
1129                 /* Can't call usb_clear_halt while in_interrupt */
1130                 /* FALLS THROUGH */
1131         default:
1132                 /* something ugly is going on... */
1133                 dev_err(dev, "%s - unexpected nonzero read status received: %d\n",
1134                         __func__, status);
1135                 cypress_set_dead(port);
1136                 return;
1137         }
1138
1139         spin_lock_irqsave(&priv->lock, flags);
1140         if (priv->rx_flags & THROTTLED) {
1141                 dev_dbg(dev, "%s - now throttling\n", __func__);
1142                 priv->rx_flags |= ACTUALLY_THROTTLED;
1143                 spin_unlock_irqrestore(&priv->lock, flags);
1144                 return;
1145         }
1146         spin_unlock_irqrestore(&priv->lock, flags);
1147
1148         tty = tty_port_tty_get(&port->port);
1149         if (!tty) {
1150                 dev_dbg(dev, "%s - bad tty pointer - exiting\n", __func__);
1151                 return;
1152         }
1153
1154         spin_lock_irqsave(&priv->lock, flags);
1155         result = urb->actual_length;
1156         switch (priv->pkt_fmt) {
1157         default:
1158         case packet_format_1:
1159                 /* This is for the CY7C64013... */
1160                 priv->current_status = data[0] & 0xF8;
1161                 bytes = data[1] + 2;
1162                 i = 2;
1163                 if (bytes > 2)
1164                         havedata = 1;
1165                 break;
1166         case packet_format_2:
1167                 /* This is for the CY7C63743... */
1168                 priv->current_status = data[0] & 0xF8;
1169                 bytes = (data[0] & 0x07) + 1;
1170                 i = 1;
1171                 if (bytes > 1)
1172                         havedata = 1;
1173                 break;
1174         }
1175         spin_unlock_irqrestore(&priv->lock, flags);
1176         if (result < bytes) {
1177                 dev_dbg(dev,
1178                         "%s - wrong packet size - received %d bytes but packet said %d bytes\n",
1179                         __func__, result, bytes);
1180                 goto continue_read;
1181         }
1182
1183         usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
1184
1185         spin_lock_irqsave(&priv->lock, flags);
1186         /* check to see if status has changed */
1187         if (priv->current_status != priv->prev_status) {
1188                 priv->diff_status |= priv->current_status ^
1189                         priv->prev_status;
1190                 wake_up_interruptible(&priv->delta_msr_wait);
1191                 priv->prev_status = priv->current_status;
1192         }
1193         spin_unlock_irqrestore(&priv->lock, flags);
1194
1195         /* hangup, as defined in acm.c... this might be a bad place for it
1196          * though */
1197         if (tty && !(tty->termios.c_cflag & CLOCAL) &&
1198                         !(priv->current_status & UART_CD)) {
1199                 dev_dbg(dev, "%s - calling hangup\n", __func__);
1200                 tty_hangup(tty);
1201                 goto continue_read;
1202         }
1203
1204         /* There is one error bit... I'm assuming it is a parity error
1205          * indicator as the generic firmware will set this bit to 1 if a
1206          * parity error occurs.
1207          * I can not find reference to any other error events. */
1208         spin_lock_irqsave(&priv->lock, flags);
1209         if (priv->current_status & CYP_ERROR) {
1210                 spin_unlock_irqrestore(&priv->lock, flags);
1211                 tty_flag = TTY_PARITY;
1212                 dev_dbg(dev, "%s - Parity Error detected\n", __func__);
1213         } else
1214                 spin_unlock_irqrestore(&priv->lock, flags);
1215
1216         /* process read if there is data other than line status */
1217         if (bytes > i) {
1218                 tty_insert_flip_string_fixed_flag(&port->port, data + i,
1219                                 tty_flag, bytes - i);
1220                 tty_flip_buffer_push(&port->port);
1221         }
1222
1223         spin_lock_irqsave(&priv->lock, flags);
1224         /* control and status byte(s) are also counted */
1225         priv->bytes_in += bytes;
1226         spin_unlock_irqrestore(&priv->lock, flags);
1227
1228 continue_read:
1229         tty_kref_put(tty);
1230
1231         /* Continue trying to always read */
1232
1233         if (priv->comm_is_ok) {
1234                 usb_fill_int_urb(port->interrupt_in_urb, port->serial->dev,
1235                                 usb_rcvintpipe(port->serial->dev,
1236                                         port->interrupt_in_endpointAddress),
1237                                 port->interrupt_in_urb->transfer_buffer,
1238                                 port->interrupt_in_urb->transfer_buffer_length,
1239                                 cypress_read_int_callback, port,
1240                                 priv->read_urb_interval);
1241                 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
1242                 if (result && result != -EPERM) {
1243                         dev_err(dev, "%s - failed resubmitting read urb, error %d\n",
1244                                 __func__, result);
1245                         cypress_set_dead(port);
1246                 }
1247         }
1248 } /* cypress_read_int_callback */
1249
1250
1251 static void cypress_write_int_callback(struct urb *urb)
1252 {
1253         struct usb_serial_port *port = urb->context;
1254         struct cypress_private *priv = usb_get_serial_port_data(port);
1255         struct device *dev = &urb->dev->dev;
1256         int result;
1257         int status = urb->status;
1258
1259         switch (status) {
1260         case 0:
1261                 /* success */
1262                 break;
1263         case -ECONNRESET:
1264         case -ENOENT:
1265         case -ESHUTDOWN:
1266                 /* this urb is terminated, clean up */
1267                 dev_dbg(dev, "%s - urb shutting down with status: %d\n",
1268                         __func__, status);
1269                 priv->write_urb_in_use = 0;
1270                 return;
1271         case -EPIPE: /* no break needed; clear halt and resubmit */
1272                 if (!priv->comm_is_ok)
1273                         break;
1274                 usb_clear_halt(port->serial->dev, 0x02);
1275                 /* error in the urb, so we have to resubmit it */
1276                 dev_dbg(dev, "%s - nonzero write bulk status received: %d\n",
1277                         __func__, status);
1278                 port->interrupt_out_urb->transfer_buffer_length = 1;
1279                 result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC);
1280                 if (!result)
1281                         return;
1282                 dev_err(dev, "%s - failed resubmitting write urb, error %d\n",
1283                         __func__, result);
1284                 cypress_set_dead(port);
1285                 break;
1286         default:
1287                 dev_err(dev, "%s - unexpected nonzero write status received: %d\n",
1288                         __func__, status);
1289                 cypress_set_dead(port);
1290                 break;
1291         }
1292         priv->write_urb_in_use = 0;
1293
1294         /* send any buffered data */
1295         cypress_send(port);
1296 }
1297
1298 module_usb_serial_driver(serial_drivers, id_table_combined);
1299
1300 MODULE_AUTHOR(DRIVER_AUTHOR);
1301 MODULE_DESCRIPTION(DRIVER_DESC);
1302 MODULE_LICENSE("GPL");
1303
1304 module_param(stats, bool, S_IRUGO | S_IWUSR);
1305 MODULE_PARM_DESC(stats, "Enable statistics or not");
1306 module_param(interval, int, S_IRUGO | S_IWUSR);
1307 MODULE_PARM_DESC(interval, "Overrides interrupt interval");
1308 module_param(unstable_bauds, bool, S_IRUGO | S_IWUSR);
1309 MODULE_PARM_DESC(unstable_bauds, "Allow unstable baud rates");