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 /*
  54  * Version Information
  55  */
  56 #define DRIVER_VERSION "v1.10"
  57 #define DRIVER_AUTHOR "Lonnie Mendez <dignome@gmail.com>, Neil Whelchel <koyama@firstlight.net>"
  58 #define DRIVER_DESC "Cypress USB to Serial Driver"
  59
  60 /* write buffer size defines */
  61 #define CYPRESS_BUF_SIZE        1024
  62
  63 static const struct usb_device_id id_table_earthmate[] = {
  64         { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
  65         { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
  66         { }                                             /* Terminating entry */
  67 };
  68
  69 static const struct usb_device_id id_table_cyphidcomrs232[] = {
  70         { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
  71         { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) },
  72         { }                                             /* Terminating entry */
  73 };
  74
  75 static const struct usb_device_id id_table_nokiaca42v2[] = {
  76         { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
  77         { }                                             /* Terminating entry */
  78 };
  79
  80 static const struct usb_device_id id_table_combined[] = {
  81         { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
  82         { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
  83         { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
  84         { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) },
  85         { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
  86         { }                                             /* Terminating entry */
  87 };
  88
  89 MODULE_DEVICE_TABLE(usb, id_table_combined);
  90
  91 enum packet_format {
  92         packet_format_1,  /* b0:status, b1:payload count */
  93         packet_format_2   /* b0[7:3]:status, b0[2:0]:payload count */
  94 };
  95
  96 struct cypress_private {
  97         spinlock_t lock;                   /* private lock */
  98         int chiptype;                      /* identifier of device, for quirks/etc */
  99         int bytes_in;                      /* used for statistics */
 100         int bytes_out;                     /* used for statistics */
 101         int cmd_count;                     /* used for statistics */
 102         int cmd_ctrl;                      /* always set this to 1 before issuing a command */
 103         struct kfifo write_fifo;           /* write fifo */
 104         int write_urb_in_use;              /* write urb in use indicator */
 105         int write_urb_interval;            /* interval to use for write urb */
 106         int read_urb_interval;             /* interval to use for read urb */
 107         int comm_is_ok;                    /* true if communication is (still) ok */
 108         int termios_initialized;
 109         __u8 line_control;                 /* holds dtr / rts value */
 110         __u8 current_status;               /* received from last read - info on dsr,cts,cd,ri,etc */
 111         __u8 current_config;               /* stores the current configuration byte */
 112         __u8 rx_flags;                     /* throttling - used from whiteheat/ftdi_sio */
 113         enum packet_format pkt_fmt;        /* format to use for packet send / receive */
 114         int get_cfg_unsafe;                /* If true, the CYPRESS_GET_CONFIG is unsafe */
 115         int baud_rate;                     /* stores current baud rate in
 116                                               integer form */
 117         int isthrottled;                   /* if throttled, discard reads */
 118         wait_queue_head_t delta_msr_wait;  /* used for TIOCMIWAIT */
 119         char prev_status, diff_status;     /* used for TIOCMIWAIT */
 120         /* we pass a pointer to this as the argument sent to
 121            cypress_set_termios old_termios */
 122         struct ktermios tmp_termios;       /* stores the old termios settings */
 123 };
 124
 125 /* function prototypes for the Cypress USB to serial device */
 126 static int  cypress_earthmate_startup(struct usb_serial *serial);
 127 static int  cypress_hidcom_startup(struct usb_serial *serial);
 128 static int  cypress_ca42v2_startup(struct usb_serial *serial);
 129 static void cypress_release(struct usb_serial *serial);
 130 static int  cypress_open(struct tty_struct *tty, struct usb_serial_port *port);
 131 static void cypress_close(struct usb_serial_port *port);
 132 static void cypress_dtr_rts(struct usb_serial_port *port, int on);
 133 static int  cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
 134                         const unsigned char *buf, int count);
 135 static void cypress_send(struct usb_serial_port *port);
 136 static int  cypress_write_room(struct tty_struct *tty);
 137 static int  cypress_ioctl(struct tty_struct *tty,
 138                         unsigned int cmd, unsigned long arg);
 139 static void cypress_set_termios(struct tty_struct *tty,
 140                         struct usb_serial_port *port, struct ktermios *old);
 141 static int  cypress_tiocmget(struct tty_struct *tty);
 142 static int  cypress_tiocmset(struct tty_struct *tty,
 143                         unsigned int set, unsigned int clear);
 144 static int  cypress_chars_in_buffer(struct tty_struct *tty);
 145 static void cypress_throttle(struct tty_struct *tty);
 146 static void cypress_unthrottle(struct tty_struct *tty);
 147 static void cypress_set_dead(struct usb_serial_port *port);
 148 static void cypress_read_int_callback(struct urb *urb);
 149 static void cypress_write_int_callback(struct urb *urb);
 150
 151 static struct usb_serial_driver cypress_earthmate_device = {
 152         .driver = {
 153                 .owner =                THIS_MODULE,
 154                 .name =                 "earthmate",
 155         },
 156         .description =                  "DeLorme Earthmate USB",
 157         .id_table =                     id_table_earthmate,
 158         .num_ports =                    1,
 159         .attach =                       cypress_earthmate_startup,
 160         .release =                      cypress_release,
 161         .open =                         cypress_open,
 162         .close =                        cypress_close,
 163         .dtr_rts =                      cypress_dtr_rts,
 164         .write =                        cypress_write,
 165         .write_room =                   cypress_write_room,
 166         .ioctl =                        cypress_ioctl,
 167         .set_termios =                  cypress_set_termios,
 168         .tiocmget =                     cypress_tiocmget,
 169         .tiocmset =                     cypress_tiocmset,
 170         .chars_in_buffer =              cypress_chars_in_buffer,
 171         .throttle =                     cypress_throttle,
 172         .unthrottle =                   cypress_unthrottle,
 173         .read_int_callback =            cypress_read_int_callback,
 174         .write_int_callback =           cypress_write_int_callback,
 175 };
 176
 177 static struct usb_serial_driver cypress_hidcom_device = {
 178         .driver = {
 179                 .owner =                THIS_MODULE,
 180                 .name =                 "cyphidcom",
 181         },
 182         .description =                  "HID->COM RS232 Adapter",
 183         .id_table =                     id_table_cyphidcomrs232,
 184         .num_ports =                    1,
 185         .attach =                       cypress_hidcom_startup,
 186         .release =                      cypress_release,
 187         .open =                         cypress_open,
 188         .close =                        cypress_close,
 189         .dtr_rts =                      cypress_dtr_rts,
 190         .write =                        cypress_write,
 191         .write_room =                   cypress_write_room,
 192         .ioctl =                        cypress_ioctl,
 193         .set_termios =                  cypress_set_termios,
 194         .tiocmget =                     cypress_tiocmget,
 195         .tiocmset =                     cypress_tiocmset,
 196         .chars_in_buffer =              cypress_chars_in_buffer,
 197         .throttle =                     cypress_throttle,
 198         .unthrottle =                   cypress_unthrottle,
 199         .read_int_callback =            cypress_read_int_callback,
 200         .write_int_callback =           cypress_write_int_callback,
 201 };
 202
 203 static struct usb_serial_driver cypress_ca42v2_device = {
 204         .driver = {
 205                 .owner =                THIS_MODULE,
 206                 .name =                 "nokiaca42v2",
 207         },
 208         .description =                  "Nokia CA-42 V2 Adapter",
 209         .id_table =                     id_table_nokiaca42v2,
 210         .num_ports =                    1,
 211         .attach =                       cypress_ca42v2_startup,
 212         .release =                      cypress_release,
 213         .open =                         cypress_open,
 214         .close =                        cypress_close,
 215         .dtr_rts =                      cypress_dtr_rts,
 216         .write =                        cypress_write,
 217         .write_room =                   cypress_write_room,
 218         .ioctl =                        cypress_ioctl,
 219         .set_termios =                  cypress_set_termios,
 220         .tiocmget =                     cypress_tiocmget,
 221         .tiocmset =                     cypress_tiocmset,
 222         .chars_in_buffer =              cypress_chars_in_buffer,
 223         .throttle =                     cypress_throttle,
 224         .unthrottle =                   cypress_unthrottle,
 225         .read_int_callback =            cypress_read_int_callback,
 226         .write_int_callback =           cypress_write_int_callback,
 227 };
 228
 229 static struct usb_serial_driver * const serial_drivers[] = {
 230         &cypress_earthmate_device, &cypress_hidcom_device,
 231         &cypress_ca42v2_device, NULL
 232 };
 233
 234 /*****************************************************************************
 235  * Cypress serial helper functions
 236  *****************************************************************************/
 237
 238
 239 static int analyze_baud_rate(struct usb_serial_port *port, speed_t new_rate)
 240 {
 241         struct cypress_private *priv;
 242         priv = usb_get_serial_port_data(port);
 243
 244         if (unstable_bauds)
 245                 return new_rate;
 246
 247         /*
 248          * The general purpose firmware for the Cypress M8 allows for
 249          * a maximum speed of 57600bps (I have no idea whether DeLorme
 250          * chose to use the general purpose firmware or not), if you
 251          * need to modify this speed setting for your own project
 252          * please add your own chiptype and modify the code likewise.
 253          * The Cypress HID->COM device will work successfully up to
 254          * 115200bps (but the actual throughput is around 3kBps).
 255          */
 256         if (port->serial->dev->speed == USB_SPEED_LOW) {
 257                 /*
 258                  * Mike Isely <isely@pobox.com> 2-Feb-2008: The
 259                  * Cypress app note that describes this mechanism
 260                  * states the the low-speed part can't handle more
 261                  * than 800 bytes/sec, in which case 4800 baud is the
 262                  * safest speed for a part like that.
 263                  */
 264                 if (new_rate > 4800) {
 265                         dev_dbg(&port->dev,
 266                                 "%s - failed setting baud rate, device incapable speed %d\n",
 267                                 __func__, new_rate);
 268                         return -1;
 269                 }
 270         }
 271         switch (priv->chiptype) {
 272         case CT_EARTHMATE:
 273                 if (new_rate <= 600) {
 274                         /* 300 and 600 baud rates are supported under
 275                          * the generic firmware, but are not used with
 276                          * NMEA and SiRF protocols */
 277                         dev_dbg(&port->dev,
 278                                 "%s - failed setting baud rate, unsupported speed of %d on Earthmate GPS",
 279                                 __func__, new_rate);
 280                         return -1;
 281                 }
 282                 break;
 283         default:
 284                 break;
 285         }
 286         return new_rate;
 287 }
 288
 289
 290 /* This function can either set or retrieve the current serial line settings */
 291 static int cypress_serial_control(struct tty_struct *tty,
 292         struct usb_serial_port *port, speed_t baud_rate, int data_bits,
 293         int stop_bits, int parity_enable, int parity_type, int reset,
 294         int cypress_request_type)
 295 {
 296         int new_baudrate = 0, retval = 0, tries = 0;
 297         struct cypress_private *priv;
 298         struct device *dev = &port->dev;
 299         u8 *feature_buffer;
 300         const unsigned int feature_len = 5;
 301         unsigned long flags;
 302
 303         priv = usb_get_serial_port_data(port);
 304
 305         if (!priv->comm_is_ok)
 306                 return -ENODEV;
 307
 308         feature_buffer = kcalloc(feature_len, sizeof(u8), GFP_KERNEL);
 309         if (!feature_buffer)
 310                 return -ENOMEM;
 311
 312         switch (cypress_request_type) {
 313         case CYPRESS_SET_CONFIG:
 314                 /* 0 means 'Hang up' so doesn't change the true bit rate */
 315                 new_baudrate = priv->baud_rate;
 316                 if (baud_rate && baud_rate != priv->baud_rate) {
 317                         dev_dbg(dev, "%s - baud rate is changing\n", __func__);
 318                         retval = analyze_baud_rate(port, baud_rate);
 319                         if (retval >= 0) {
 320                                 new_baudrate = retval;
 321                                 dev_dbg(dev, "%s - New baud rate set to %d\n",
 322                                         __func__, new_baudrate);
 323                         }
 324                 }
 325                 dev_dbg(dev, "%s - baud rate is being sent as %d\n", __func__,
 326                         new_baudrate);
 327
 328                 /* fill the feature_buffer with new configuration */
 329                 put_unaligned_le32(new_baudrate, feature_buffer);
 330                 feature_buffer[4] |= data_bits;   /* assign data bits in 2 bit space ( max 3 ) */
 331                 /* 1 bit gap */
 332                 feature_buffer[4] |= (stop_bits << 3);   /* assign stop bits in 1 bit space */
 333                 feature_buffer[4] |= (parity_enable << 4);   /* assign parity flag in 1 bit space */
 334                 feature_buffer[4] |= (parity_type << 5);   /* assign parity type in 1 bit space */
 335                 /* 1 bit gap */
 336                 feature_buffer[4] |= (reset << 7);   /* assign reset at end of byte, 1 bit space */
 337
 338                 dev_dbg(dev, "%s - device is being sent this feature report:\n", __func__);
 339                 dev_dbg(dev, "%s - %02X - %02X - %02X - %02X - %02X\n", __func__,
 340                         feature_buffer[0], feature_buffer[1],
 341                         feature_buffer[2], feature_buffer[3],
 342                         feature_buffer[4]);
 343
 344                 do {
 345                         retval = usb_control_msg(port->serial->dev,
 346                                         usb_sndctrlpipe(port->serial->dev, 0),
 347                                         HID_REQ_SET_REPORT,
 348                                         USB_DIR_OUT | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
 349                                         0x0300, 0, feature_buffer,
 350                                         feature_len, 500);
 351
 352                         if (tries++ >= 3)
 353                                 break;
 354
 355                 } while (retval != feature_len &&
 356                          retval != -ENODEV);
 357
 358                 if (retval != feature_len) {
 359                         dev_err(dev, "%s - failed sending serial line settings - %d\n",
 360                                 __func__, retval);
 361                         cypress_set_dead(port);
 362                 } else {
 363                         spin_lock_irqsave(&priv->lock, flags);
 364                         priv->baud_rate = new_baudrate;
 365                         priv->current_config = feature_buffer[4];
 366                         spin_unlock_irqrestore(&priv->lock, flags);
 367                         /* If we asked for a speed change encode it */
 368                         if (baud_rate)
 369                                 tty_encode_baud_rate(tty,
 370                                         new_baudrate, new_baudrate);
 371                 }
 372         break;
 373         case CYPRESS_GET_CONFIG:
 374                 if (priv->get_cfg_unsafe) {
 375                         /* Not implemented for this device,
 376                            and if we try to do it we're likely
 377                            to crash the hardware. */
 378                         retval = -ENOTTY;
 379                         goto out;
 380                 }
 381                 dev_dbg(dev, "%s - retreiving serial line settings\n", __func__);
 382                 do {
 383                         retval = usb_control_msg(port->serial->dev,
 384                                         usb_rcvctrlpipe(port->serial->dev, 0),
 385                                         HID_REQ_GET_REPORT,
 386                                         USB_DIR_IN | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
 387                                         0x0300, 0, feature_buffer,
 388                                         feature_len, 500);
 389
 390                         if (tries++ >= 3)
 391                                 break;
 392                 } while (retval != feature_len
 393                                                 && retval != -ENODEV);
 394
 395                 if (retval != feature_len) {
 396                         dev_err(dev, "%s - failed to retrieve serial line settings - %d\n",
 397                                 __func__, retval);
 398                         cypress_set_dead(port);
 399                         goto out;
 400                 } else {
 401                         spin_lock_irqsave(&priv->lock, flags);
 402                         /* store the config in one byte, and later
 403                            use bit masks to check values */
 404                         priv->current_config = feature_buffer[4];
 405                         priv->baud_rate = get_unaligned_le32(feature_buffer);
 406                         spin_unlock_irqrestore(&priv->lock, flags);
 407                 }
 408         }
 409         spin_lock_irqsave(&priv->lock, flags);
 410         ++priv->cmd_count;
 411         spin_unlock_irqrestore(&priv->lock, flags);
 412 out:
 413         kfree(feature_buffer);
 414         return retval;
 415 } /* cypress_serial_control */
 416
 417
 418 static void cypress_set_dead(struct usb_serial_port *port)
 419 {
 420         struct cypress_private *priv = usb_get_serial_port_data(port);
 421         unsigned long flags;
 422
 423         spin_lock_irqsave(&priv->lock, flags);
 424         if (!priv->comm_is_ok) {
 425                 spin_unlock_irqrestore(&priv->lock, flags);
 426                 return;
 427         }
 428         priv->comm_is_ok = 0;
 429         spin_unlock_irqrestore(&priv->lock, flags);
 430
 431         dev_err(&port->dev, "cypress_m8 suspending failing port %d - "
 432                 "interval might be too short\n", port->number);
 433 }
 434
 435
 436 /*****************************************************************************
 437  * Cypress serial driver functions
 438  *****************************************************************************/
 439
 440
 441 static int generic_startup(struct usb_serial *serial)
 442 {
 443         struct cypress_private *priv;
 444         struct usb_serial_port *port = serial->port[0];
 445
 446         priv = kzalloc(sizeof(struct cypress_private), GFP_KERNEL);
 447         if (!priv)
 448                 return -ENOMEM;
 449
 450         priv->comm_is_ok = !0;
 451         spin_lock_init(&priv->lock);
 452         if (kfifo_alloc(&priv->write_fifo, CYPRESS_BUF_SIZE, GFP_KERNEL)) {
 453                 kfree(priv);
 454                 return -ENOMEM;
 455         }
 456         init_waitqueue_head(&priv->delta_msr_wait);
 457
 458         usb_reset_configuration(serial->dev);
 459
 460         priv->cmd_ctrl = 0;
 461         priv->line_control = 0;
 462         priv->termios_initialized = 0;
 463         priv->rx_flags = 0;
 464         /* Default packet format setting is determined by packet size.
 465            Anything with a size larger then 9 must have a separate
 466            count field since the 3 bit count field is otherwise too
 467            small.  Otherwise we can use the slightly more compact
 468            format.  This is in accordance with the cypress_m8 serial
 469            converter app note. */
 470         if (port->interrupt_out_size > 9)
 471                 priv->pkt_fmt = packet_format_1;
 472         else
 473                 priv->pkt_fmt = packet_format_2;
 474
 475         if (interval > 0) {
 476                 priv->write_urb_interval = interval;
 477                 priv->read_urb_interval = interval;
 478                 dev_dbg(&port->dev, "%s - read & write intervals forced to %d\n",
 479                         __func__, interval);
 480         } else {
 481                 priv->write_urb_interval = port->interrupt_out_urb->interval;
 482                 priv->read_urb_interval = port->interrupt_in_urb->interval;
 483                 dev_dbg(&port->dev, "%s - intervals: read=%d write=%d\n",
 484                         __func__, priv->read_urb_interval,
 485                         priv->write_urb_interval);
 486         }
 487         usb_set_serial_port_data(port, priv);
 488
 489         return 0;
 490 }
 491
 492
 493 static int cypress_earthmate_startup(struct usb_serial *serial)
 494 {
 495         struct cypress_private *priv;
 496         struct usb_serial_port *port = serial->port[0];
 497
 498         if (generic_startup(serial)) {
 499                 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
 500                 return 1;
 501         }
 502
 503         priv = usb_get_serial_port_data(port);
 504         priv->chiptype = CT_EARTHMATE;
 505         /* All Earthmate devices use the separated-count packet
 506            format!  Idiotic. */
 507         priv->pkt_fmt = packet_format_1;
 508         if (serial->dev->descriptor.idProduct !=
 509                                 cpu_to_le16(PRODUCT_ID_EARTHMATEUSB)) {
 510                 /* The old original USB Earthmate seemed able to
 511                    handle GET_CONFIG requests; everything they've
 512                    produced since that time crashes if this command is
 513                    attempted :-( */
 514                 dev_dbg(&port->dev,
 515                         "%s - Marking this device as unsafe for GET_CONFIG commands\n",
 516                         __func__);
 517                 priv->get_cfg_unsafe = !0;
 518         }
 519
 520         return 0;
 521 } /* cypress_earthmate_startup */
 522
 523
 524 static int cypress_hidcom_startup(struct usb_serial *serial)
 525 {
 526         struct cypress_private *priv;
 527         struct usb_serial_port *port = serial->port[0];
 528
 529         if (generic_startup(serial)) {
 530                 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
 531                 return 1;
 532         }
 533
 534         priv = usb_get_serial_port_data(port);
 535         priv->chiptype = CT_CYPHIDCOM;
 536
 537         return 0;
 538 } /* cypress_hidcom_startup */
 539
 540
 541 static int cypress_ca42v2_startup(struct usb_serial *serial)
 542 {
 543         struct cypress_private *priv;
 544         struct usb_serial_port *port = serial->port[0];
 545
 546         if (generic_startup(serial)) {
 547                 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
 548                 return 1;
 549         }
 550
 551         priv = usb_get_serial_port_data(port);
 552         priv->chiptype = CT_CA42V2;
 553
 554         return 0;
 555 } /* cypress_ca42v2_startup */
 556
 557
 558 static void cypress_release(struct usb_serial *serial)
 559 {
 560         struct cypress_private *priv;
 561
 562         /* all open ports are closed at this point */
 563         priv = usb_get_serial_port_data(serial->port[0]);
 564
 565         if (priv) {
 566                 kfifo_free(&priv->write_fifo);
 567                 kfree(priv);
 568         }
 569 }
 570
 571
 572 static int cypress_open(struct tty_struct *tty, struct usb_serial_port *port)
 573 {
 574         struct cypress_private *priv = usb_get_serial_port_data(port);
 575         struct usb_serial *serial = port->serial;
 576         unsigned long flags;
 577         int result = 0;
 578
 579         if (!priv->comm_is_ok)
 580                 return -EIO;
 581
 582         /* clear halts before open */
 583         usb_clear_halt(serial->dev, 0x81);
 584         usb_clear_halt(serial->dev, 0x02);
 585
 586         spin_lock_irqsave(&priv->lock, flags);
 587         /* reset read/write statistics */
 588         priv->bytes_in = 0;
 589         priv->bytes_out = 0;
 590         priv->cmd_count = 0;
 591         priv->rx_flags = 0;
 592         spin_unlock_irqrestore(&priv->lock, flags);
 593
 594         /* Set termios */
 595         cypress_send(port);
 596
 597         if (tty)
 598                 cypress_set_termios(tty, port, &priv->tmp_termios);
 599
 600         /* setup the port and start reading from the device */
 601         if (!port->interrupt_in_urb) {
 602                 dev_err(&port->dev, "%s - interrupt_in_urb is empty!\n",
 603                         __func__);
 604                 return -1;
 605         }
 606
 607         usb_fill_int_urb(port->interrupt_in_urb, serial->dev,
 608                 usb_rcvintpipe(serial->dev, port->interrupt_in_endpointAddress),
 609                 port->interrupt_in_urb->transfer_buffer,
 610                 port->interrupt_in_urb->transfer_buffer_length,
 611                 cypress_read_int_callback, port, priv->read_urb_interval);
 612         result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
 613
 614         if (result) {
 615                 dev_err(&port->dev,
 616                         "%s - failed submitting read urb, error %d\n",
 617                                                         __func__, result);
 618                 cypress_set_dead(port);
 619         }
 620         port->port.drain_delay = 256;
 621         return result;
 622 } /* cypress_open */
 623
 624 static void cypress_dtr_rts(struct usb_serial_port *port, int on)
 625 {
 626         struct cypress_private *priv = usb_get_serial_port_data(port);
 627         /* drop dtr and rts */
 628         spin_lock_irq(&priv->lock);
 629         if (on == 0)
 630                 priv->line_control = 0;
 631         else
 632                 priv->line_control = CONTROL_DTR | CONTROL_RTS;
 633         priv->cmd_ctrl = 1;
 634         spin_unlock_irq(&priv->lock);
 635         cypress_write(NULL, port, NULL, 0);
 636 }
 637
 638 static void cypress_close(struct usb_serial_port *port)
 639 {
 640         struct cypress_private *priv = usb_get_serial_port_data(port);
 641         unsigned long flags;
 642
 643         /* writing is potentially harmful, lock must be taken */
 644         mutex_lock(&port->serial->disc_mutex);
 645         if (port->serial->disconnected) {
 646                 mutex_unlock(&port->serial->disc_mutex);
 647                 return;
 648         }
 649         spin_lock_irqsave(&priv->lock, flags);
 650         kfifo_reset_out(&priv->write_fifo);
 651         spin_unlock_irqrestore(&priv->lock, flags);
 652
 653         dev_dbg(&port->dev, "%s - stopping urbs\n", __func__);
 654         usb_kill_urb(port->interrupt_in_urb);
 655         usb_kill_urb(port->interrupt_out_urb);
 656
 657         if (stats)
 658                 dev_info(&port->dev, "Statistics: %d Bytes In | %d Bytes Out | %d Commands Issued\n",
 659                         priv->bytes_in, priv->bytes_out, priv->cmd_count);
 660         mutex_unlock(&port->serial->disc_mutex);
 661 } /* cypress_close */
 662
 663
 664 static int cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
 665                                         const unsigned char *buf, int count)
 666 {
 667         struct cypress_private *priv = usb_get_serial_port_data(port);
 668
 669         dev_dbg(&port->dev, "%s - port %d, %d bytes\n", __func__, port->number, count);
 670
 671         /* line control commands, which need to be executed immediately,
 672            are not put into the buffer for obvious reasons.
 673          */
 674         if (priv->cmd_ctrl) {
 675                 count = 0;
 676                 goto finish;
 677         }
 678
 679         if (!count)
 680                 return count;
 681
 682         count = kfifo_in_locked(&priv->write_fifo, buf, count, &priv->lock);
 683
 684 finish:
 685         cypress_send(port);
 686
 687         return count;
 688 } /* cypress_write */
 689
 690
 691 static void cypress_send(struct usb_serial_port *port)
 692 {
 693         int count = 0, result, offset, actual_size;
 694         struct cypress_private *priv = usb_get_serial_port_data(port);
 695         struct device *dev = &port->dev;
 696         unsigned long flags;
 697
 698         if (!priv->comm_is_ok)
 699                 return;
 700
 701         dev_dbg(dev, "%s - interrupt out size is %d\n", __func__,
 702                 port->interrupt_out_size);
 703
 704         spin_lock_irqsave(&priv->lock, flags);
 705         if (priv->write_urb_in_use) {
 706                 dev_dbg(dev, "%s - can't write, urb in use\n", __func__);
 707                 spin_unlock_irqrestore(&priv->lock, flags);
 708                 return;
 709         }
 710         spin_unlock_irqrestore(&priv->lock, flags);
 711
 712         /* clear buffer */
 713         memset(port->interrupt_out_urb->transfer_buffer, 0,
 714                                                 port->interrupt_out_size);
 715
 716         spin_lock_irqsave(&priv->lock, flags);
 717         switch (priv->pkt_fmt) {
 718         default:
 719         case packet_format_1:
 720                 /* this is for the CY7C64013... */
 721                 offset = 2;
 722                 port->interrupt_out_buffer[0] = priv->line_control;
 723                 break;
 724         case packet_format_2:
 725                 /* this is for the CY7C63743... */
 726                 offset = 1;
 727                 port->interrupt_out_buffer[0] = priv->line_control;
 728                 break;
 729         }
 730
 731         if (priv->line_control & CONTROL_RESET)
 732                 priv->line_control &= ~CONTROL_RESET;
 733
 734         if (priv->cmd_ctrl) {
 735                 priv->cmd_count++;
 736                 dev_dbg(dev, "%s - line control command being issued\n", __func__);
 737                 spin_unlock_irqrestore(&priv->lock, flags);
 738                 goto send;
 739         } else
 740                 spin_unlock_irqrestore(&priv->lock, flags);
 741
 742         count = kfifo_out_locked(&priv->write_fifo,
 743                                         &port->interrupt_out_buffer[offset],
 744                                         port->interrupt_out_size - offset,
 745                                         &priv->lock);
 746         if (count == 0)
 747                 return;
 748
 749         switch (priv->pkt_fmt) {
 750         default:
 751         case packet_format_1:
 752                 port->interrupt_out_buffer[1] = count;
 753                 break;
 754         case packet_format_2:
 755                 port->interrupt_out_buffer[0] |= count;
 756         }
 757
 758         dev_dbg(dev, "%s - count is %d\n", __func__, count);
 759
 760 send:
 761         spin_lock_irqsave(&priv->lock, flags);
 762         priv->write_urb_in_use = 1;
 763         spin_unlock_irqrestore(&priv->lock, flags);
 764
 765         if (priv->cmd_ctrl)
 766                 actual_size = 1;
 767         else
 768                 actual_size = count +
 769                               (priv->pkt_fmt == packet_format_1 ? 2 : 1);
 770
 771         usb_serial_debug_data(dev, __func__, port->interrupt_out_size,
 772                               port->interrupt_out_urb->transfer_buffer);
 773
 774         usb_fill_int_urb(port->interrupt_out_urb, port->serial->dev,
 775                 usb_sndintpipe(port->serial->dev, port->interrupt_out_endpointAddress),
 776                 port->interrupt_out_buffer, port->interrupt_out_size,
 777                 cypress_write_int_callback, port, priv->write_urb_interval);
 778         result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC);
 779         if (result) {
 780                 dev_err_console(port,
 781                                 "%s - failed submitting write urb, error %d\n",
 782                                                         __func__, result);
 783                 priv->write_urb_in_use = 0;
 784                 cypress_set_dead(port);
 785         }
 786
 787         spin_lock_irqsave(&priv->lock, flags);
 788         if (priv->cmd_ctrl)
 789                 priv->cmd_ctrl = 0;
 790
 791         /* do not count the line control and size bytes */
 792         priv->bytes_out += count;
 793         spin_unlock_irqrestore(&priv->lock, flags);
 794
 795         usb_serial_port_softint(port);
 796 } /* cypress_send */
 797
 798
 799 /* returns how much space is available in the soft buffer */
 800 static int cypress_write_room(struct tty_struct *tty)
 801 {
 802         struct usb_serial_port *port = tty->driver_data;
 803         struct cypress_private *priv = usb_get_serial_port_data(port);
 804         int room = 0;
 805         unsigned long flags;
 806
 807         spin_lock_irqsave(&priv->lock, flags);
 808         room = kfifo_avail(&priv->write_fifo);
 809         spin_unlock_irqrestore(&priv->lock, flags);
 810
 811         dev_dbg(&port->dev, "%s - returns %d\n", __func__, room);
 812         return room;
 813 }
 814
 815
 816 static int cypress_tiocmget(struct tty_struct *tty)
 817 {
 818         struct usb_serial_port *port = tty->driver_data;
 819         struct cypress_private *priv = usb_get_serial_port_data(port);
 820         __u8 status, control;
 821         unsigned int result = 0;
 822         unsigned long flags;
 823
 824         spin_lock_irqsave(&priv->lock, flags);
 825         control = priv->line_control;
 826         status = priv->current_status;
 827         spin_unlock_irqrestore(&priv->lock, flags);
 828
 829         result = ((control & CONTROL_DTR)        ? TIOCM_DTR : 0)
 830                 | ((control & CONTROL_RTS)       ? TIOCM_RTS : 0)
 831                 | ((status & UART_CTS)        ? TIOCM_CTS : 0)
 832                 | ((status & UART_DSR)        ? TIOCM_DSR : 0)
 833                 | ((status & UART_RI)         ? TIOCM_RI  : 0)
 834                 | ((status & UART_CD)         ? TIOCM_CD  : 0);
 835
 836         dev_dbg(&port->dev, "%s - result = %x\n", __func__, result);
 837
 838         return result;
 839 }
 840
 841
 842 static int cypress_tiocmset(struct tty_struct *tty,
 843                                unsigned int set, unsigned int clear)
 844 {
 845         struct usb_serial_port *port = tty->driver_data;
 846         struct cypress_private *priv = usb_get_serial_port_data(port);
 847         unsigned long flags;
 848
 849         spin_lock_irqsave(&priv->lock, flags);
 850         if (set & TIOCM_RTS)
 851                 priv->line_control |= CONTROL_RTS;
 852         if (set & TIOCM_DTR)
 853                 priv->line_control |= CONTROL_DTR;
 854         if (clear & TIOCM_RTS)
 855                 priv->line_control &= ~CONTROL_RTS;
 856         if (clear & TIOCM_DTR)
 857                 priv->line_control &= ~CONTROL_DTR;
 858         priv->cmd_ctrl = 1;
 859         spin_unlock_irqrestore(&priv->lock, flags);
 860
 861         return cypress_write(tty, port, NULL, 0);
 862 }
 863
 864
 865 static int cypress_ioctl(struct tty_struct *tty,
 866                                         unsigned int cmd, unsigned long arg)
 867 {
 868         struct usb_serial_port *port = tty->driver_data;
 869         struct cypress_private *priv = usb_get_serial_port_data(port);
 870
 871         dev_dbg(&port->dev, "%s - port %d, cmd 0x%.4x\n", __func__, port->number, cmd);
 872
 873         switch (cmd) {
 874         /* This code comes from drivers/char/serial.c and ftdi_sio.c */
 875         case TIOCMIWAIT:
 876                 while (priv != NULL) {
 877                         interruptible_sleep_on(&priv->delta_msr_wait);
 878                         /* see if a signal did it */
 879                         if (signal_pending(current))
 880                                 return -ERESTARTSYS;
 881                         else {
 882                                 char diff = priv->diff_status;
 883                                 if (diff == 0)
 884                                         return -EIO; /* no change => error */
 885
 886                                 /* consume all events */
 887                                 priv->diff_status = 0;
 888
 889                                 /* return 0 if caller wanted to know about
 890                                    these bits */
 891                                 if (((arg & TIOCM_RNG) && (diff & UART_RI)) ||
 892                                     ((arg & TIOCM_DSR) && (diff & UART_DSR)) ||
 893                                     ((arg & TIOCM_CD) && (diff & UART_CD)) ||
 894                                     ((arg & TIOCM_CTS) && (diff & UART_CTS)))
 895                                         return 0;
 896                                 /* otherwise caller can't care less about what
 897                                  * happened, and so we continue to wait for
 898                                  * more events.
 899                                  */
 900                         }
 901                 }
 902                 return 0;
 903         default:
 904                 break;
 905         }
 906         dev_dbg(&port->dev, "%s - arg not supported - it was 0x%04x - check include/asm/ioctls.h\n", __func__, cmd);
 907         return -ENOIOCTLCMD;
 908 } /* cypress_ioctl */
 909
 910
 911 static void cypress_set_termios(struct tty_struct *tty,
 912         struct usb_serial_port *port, struct ktermios *old_termios)
 913 {
 914         struct cypress_private *priv = usb_get_serial_port_data(port);
 915         struct device *dev = &port->dev;
 916         int data_bits, stop_bits, parity_type, parity_enable;
 917         unsigned cflag, iflag;
 918         unsigned long flags;
 919         __u8 oldlines;
 920         int linechange = 0;
 921
 922         spin_lock_irqsave(&priv->lock, flags);
 923         /* We can't clean this one up as we don't know the device type
 924            early enough */
 925         if (!priv->termios_initialized) {
 926                 if (priv->chiptype == CT_EARTHMATE) {
 927                         tty->termios = tty_std_termios;
 928                         tty->termios.c_cflag = B4800 | CS8 | CREAD | HUPCL |
 929                                 CLOCAL;
 930                         tty->termios.c_ispeed = 4800;
 931                         tty->termios.c_ospeed = 4800;
 932                 } else if (priv->chiptype == CT_CYPHIDCOM) {
 933                         tty->termios = tty_std_termios;
 934                         tty->termios.c_cflag = B9600 | CS8 | CREAD | HUPCL |
 935                                 CLOCAL;
 936                         tty->termios.c_ispeed = 9600;
 937                         tty->termios.c_ospeed = 9600;
 938                 } else if (priv->chiptype == CT_CA42V2) {
 939                         tty->termios = tty_std_termios;
 940                         tty->termios.c_cflag = B9600 | CS8 | CREAD | HUPCL |
 941                                 CLOCAL;
 942                         tty->termios.c_ispeed = 9600;
 943                         tty->termios.c_ospeed = 9600;
 944                 }
 945                 priv->termios_initialized = 1;
 946         }
 947         spin_unlock_irqrestore(&priv->lock, flags);
 948
 949         /* Unsupported features need clearing */
 950         tty->termios.c_cflag &= ~(CMSPAR|CRTSCTS);
 951
 952         cflag = tty->termios.c_cflag;
 953         iflag = tty->termios.c_iflag;
 954
 955         /* check if there are new settings */
 956         if (old_termios) {
 957                 spin_lock_irqsave(&priv->lock, flags);
 958                 priv->tmp_termios = tty->termios;
 959                 spin_unlock_irqrestore(&priv->lock, flags);
 960         }
 961
 962         /* set number of data bits, parity, stop bits */
 963         /* when parity is disabled the parity type bit is ignored */
 964
 965         /* 1 means 2 stop bits, 0 means 1 stop bit */
 966         stop_bits = cflag & CSTOPB ? 1 : 0;
 967
 968         if (cflag & PARENB) {
 969                 parity_enable = 1;
 970                 /* 1 means odd parity, 0 means even parity */
 971                 parity_type = cflag & PARODD ? 1 : 0;
 972         } else
 973                 parity_enable = parity_type = 0;
 974
 975         switch (cflag & CSIZE) {
 976         case CS5:
 977                 data_bits = 0;
 978                 break;
 979         case CS6:
 980                 data_bits = 1;
 981                 break;
 982         case CS7:
 983                 data_bits = 2;
 984                 break;
 985         case CS8:
 986                 data_bits = 3;
 987                 break;
 988         default:
 989                 dev_err(dev, "%s - CSIZE was set, but not CS5-CS8\n", __func__);
 990                 data_bits = 3;
 991         }
 992         spin_lock_irqsave(&priv->lock, flags);
 993         oldlines = priv->line_control;
 994         if ((cflag & CBAUD) == B0) {
 995                 /* drop dtr and rts */
 996                 dev_dbg(dev, "%s - dropping the lines, baud rate 0bps\n", __func__);
 997                 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
 998         } else
 999                 priv->line_control = (CONTROL_DTR | CONTROL_RTS);
1000         spin_unlock_irqrestore(&priv->lock, flags);
1001
1002         dev_dbg(dev, "%s - sending %d stop_bits, %d parity_enable, %d parity_type, %d data_bits (+5)\n",
1003                 __func__, stop_bits, parity_enable, parity_type, data_bits);
1004
1005         cypress_serial_control(tty, port, tty_get_baud_rate(tty),
1006                         data_bits, stop_bits,
1007                         parity_enable, parity_type,
1008                         0, CYPRESS_SET_CONFIG);
1009
1010         /* we perform a CYPRESS_GET_CONFIG so that the current settings are
1011          * filled into the private structure this should confirm that all is
1012          * working if it returns what we just set */
1013         cypress_serial_control(tty, port, 0, 0, 0, 0, 0, 0, CYPRESS_GET_CONFIG);
1014
1015         /* Here we can define custom tty settings for devices; the main tty
1016          * termios flag base comes from empeg.c */
1017
1018         spin_lock_irqsave(&priv->lock, flags);
1019         if (priv->chiptype == CT_EARTHMATE && priv->baud_rate == 4800) {
1020                 dev_dbg(dev, "Using custom termios settings for a baud rate of 4800bps.\n");
1021                 /* define custom termios settings for NMEA protocol */
1022
1023                 tty->termios.c_iflag /* input modes - */
1024                         &= ~(IGNBRK  /* disable ignore break */
1025                         | BRKINT     /* disable break causes interrupt */
1026                         | PARMRK     /* disable mark parity errors */
1027                         | ISTRIP     /* disable clear high bit of input char */
1028                         | INLCR      /* disable translate NL to CR */
1029                         | IGNCR      /* disable ignore CR */
1030                         | ICRNL      /* disable translate CR to NL */
1031                         | IXON);     /* disable enable XON/XOFF flow control */
1032
1033                 tty->termios.c_oflag /* output modes */
1034                         &= ~OPOST;    /* disable postprocess output char */
1035
1036                 tty->termios.c_lflag /* line discipline modes */
1037                         &= ~(ECHO     /* disable echo input characters */
1038                         | ECHONL      /* disable echo new line */
1039                         | ICANON      /* disable erase, kill, werase, and rprnt
1040                                          special characters */
1041                         | ISIG        /* disable interrupt, quit, and suspend
1042                                          special characters */
1043                         | IEXTEN);    /* disable non-POSIX special characters */
1044         } /* CT_CYPHIDCOM: Application should handle this for device */
1045
1046         linechange = (priv->line_control != oldlines);
1047         spin_unlock_irqrestore(&priv->lock, flags);
1048
1049         /* if necessary, set lines */
1050         if (linechange) {
1051                 priv->cmd_ctrl = 1;
1052                 cypress_write(tty, port, NULL, 0);
1053         }
1054 } /* cypress_set_termios */
1055
1056
1057 /* returns amount of data still left in soft buffer */
1058 static int cypress_chars_in_buffer(struct tty_struct *tty)
1059 {
1060         struct usb_serial_port *port = tty->driver_data;
1061         struct cypress_private *priv = usb_get_serial_port_data(port);
1062         int chars = 0;
1063         unsigned long flags;
1064
1065         spin_lock_irqsave(&priv->lock, flags);
1066         chars = kfifo_len(&priv->write_fifo);
1067         spin_unlock_irqrestore(&priv->lock, flags);
1068
1069         dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
1070         return chars;
1071 }
1072
1073
1074 static void cypress_throttle(struct tty_struct *tty)
1075 {
1076         struct usb_serial_port *port = tty->driver_data;
1077         struct cypress_private *priv = usb_get_serial_port_data(port);
1078
1079         spin_lock_irq(&priv->lock);
1080         priv->rx_flags = THROTTLED;
1081         spin_unlock_irq(&priv->lock);
1082 }
1083
1084
1085 static void cypress_unthrottle(struct tty_struct *tty)
1086 {
1087         struct usb_serial_port *port = tty->driver_data;
1088         struct cypress_private *priv = usb_get_serial_port_data(port);
1089         int actually_throttled, result;
1090
1091         spin_lock_irq(&priv->lock);
1092         actually_throttled = priv->rx_flags & ACTUALLY_THROTTLED;
1093         priv->rx_flags = 0;
1094         spin_unlock_irq(&priv->lock);
1095
1096         if (!priv->comm_is_ok)
1097                 return;
1098
1099         if (actually_throttled) {
1100                 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
1101                 if (result) {
1102                         dev_err(&port->dev, "%s - failed submitting read urb, "
1103                                         "error %d\n", __func__, result);
1104                         cypress_set_dead(port);
1105                 }
1106         }
1107 }
1108
1109
1110 static void cypress_read_int_callback(struct urb *urb)
1111 {
1112         struct usb_serial_port *port = urb->context;
1113         struct cypress_private *priv = usb_get_serial_port_data(port);
1114         struct device *dev = &urb->dev->dev;
1115         struct tty_struct *tty;
1116         unsigned char *data = urb->transfer_buffer;
1117         unsigned long flags;
1118         char tty_flag = TTY_NORMAL;
1119         int havedata = 0;
1120         int bytes = 0;
1121         int result;
1122         int i = 0;
1123         int status = urb->status;
1124
1125         switch (status) {
1126         case 0: /* success */
1127                 break;
1128         case -ECONNRESET:
1129         case -ENOENT:
1130         case -ESHUTDOWN:
1131                 /* precursor to disconnect so just go away */
1132                 return;
1133         case -EPIPE:
1134                 /* Can't call usb_clear_halt while in_interrupt */
1135                 /* FALLS THROUGH */
1136         default:
1137                 /* something ugly is going on... */
1138                 dev_err(dev, "%s - unexpected nonzero read status received: %d\n",
1139                         __func__, status);
1140                 cypress_set_dead(port);
1141                 return;
1142         }
1143
1144         spin_lock_irqsave(&priv->lock, flags);
1145         if (priv->rx_flags & THROTTLED) {
1146                 dev_dbg(dev, "%s - now throttling\n", __func__);
1147                 priv->rx_flags |= ACTUALLY_THROTTLED;
1148                 spin_unlock_irqrestore(&priv->lock, flags);
1149                 return;
1150         }
1151         spin_unlock_irqrestore(&priv->lock, flags);
1152
1153         tty = tty_port_tty_get(&port->port);
1154         if (!tty) {
1155                 dev_dbg(dev, "%s - bad tty pointer - exiting\n", __func__);
1156                 return;
1157         }
1158
1159         spin_lock_irqsave(&priv->lock, flags);
1160         result = urb->actual_length;
1161         switch (priv->pkt_fmt) {
1162         default:
1163         case packet_format_1:
1164                 /* This is for the CY7C64013... */
1165                 priv->current_status = data[0] & 0xF8;
1166                 bytes = data[1] + 2;
1167                 i = 2;
1168                 if (bytes > 2)
1169                         havedata = 1;
1170                 break;
1171         case packet_format_2:
1172                 /* This is for the CY7C63743... */
1173                 priv->current_status = data[0] & 0xF8;
1174                 bytes = (data[0] & 0x07) + 1;
1175                 i = 1;
1176                 if (bytes > 1)
1177                         havedata = 1;
1178                 break;
1179         }
1180         spin_unlock_irqrestore(&priv->lock, flags);
1181         if (result < bytes) {
1182                 dev_dbg(dev,
1183                         "%s - wrong packet size - received %d bytes but packet said %d bytes\n",
1184                         __func__, result, bytes);
1185                 goto continue_read;
1186         }
1187
1188         usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
1189
1190         spin_lock_irqsave(&priv->lock, flags);
1191         /* check to see if status has changed */
1192         if (priv->current_status != priv->prev_status) {
1193                 priv->diff_status |= priv->current_status ^
1194                         priv->prev_status;
1195                 wake_up_interruptible(&priv->delta_msr_wait);
1196                 priv->prev_status = priv->current_status;
1197         }
1198         spin_unlock_irqrestore(&priv->lock, flags);
1199
1200         /* hangup, as defined in acm.c... this might be a bad place for it
1201          * though */
1202         if (tty && !(tty->termios.c_cflag & CLOCAL) &&
1203                         !(priv->current_status & UART_CD)) {
1204                 dev_dbg(dev, "%s - calling hangup\n", __func__);
1205                 tty_hangup(tty);
1206                 goto continue_read;
1207         }
1208
1209         /* There is one error bit... I'm assuming it is a parity error
1210          * indicator as the generic firmware will set this bit to 1 if a
1211          * parity error occurs.
1212          * I can not find reference to any other error events. */
1213         spin_lock_irqsave(&priv->lock, flags);
1214         if (priv->current_status & CYP_ERROR) {
1215                 spin_unlock_irqrestore(&priv->lock, flags);
1216                 tty_flag = TTY_PARITY;
1217                 dev_dbg(dev, "%s - Parity Error detected\n", __func__);
1218         } else
1219                 spin_unlock_irqrestore(&priv->lock, flags);
1220
1221         /* process read if there is data other than line status */
1222         if (tty && bytes > i) {
1223                 tty_insert_flip_string_fixed_flag(tty, data + i,
1224                                 tty_flag, bytes - i);
1225                 tty_flip_buffer_push(tty);
1226         }
1227
1228         spin_lock_irqsave(&priv->lock, flags);
1229         /* control and status byte(s) are also counted */
1230         priv->bytes_in += bytes;
1231         spin_unlock_irqrestore(&priv->lock, flags);
1232
1233 continue_read:
1234         tty_kref_put(tty);
1235
1236         /* Continue trying to always read */
1237
1238         if (priv->comm_is_ok) {
1239                 usb_fill_int_urb(port->interrupt_in_urb, port->serial->dev,
1240                                 usb_rcvintpipe(port->serial->dev,
1241                                         port->interrupt_in_endpointAddress),
1242                                 port->interrupt_in_urb->transfer_buffer,
1243                                 port->interrupt_in_urb->transfer_buffer_length,
1244                                 cypress_read_int_callback, port,
1245                                 priv->read_urb_interval);
1246                 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
1247                 if (result && result != -EPERM) {
1248                         dev_err(dev, "%s - failed resubmitting read urb, error %d\n",
1249                                 __func__, result);
1250                         cypress_set_dead(port);
1251                 }
1252         }
1253 } /* cypress_read_int_callback */
1254
1255
1256 static void cypress_write_int_callback(struct urb *urb)
1257 {
1258         struct usb_serial_port *port = urb->context;
1259         struct cypress_private *priv = usb_get_serial_port_data(port);
1260         struct device *dev = &urb->dev->dev;
1261         int result;
1262         int status = urb->status;
1263
1264         switch (status) {
1265         case 0:
1266                 /* success */
1267                 break;
1268         case -ECONNRESET:
1269         case -ENOENT:
1270         case -ESHUTDOWN:
1271                 /* this urb is terminated, clean up */
1272                 dev_dbg(dev, "%s - urb shutting down with status: %d\n",
1273                         __func__, status);
1274                 priv->write_urb_in_use = 0;
1275                 return;
1276         case -EPIPE: /* no break needed; clear halt and resubmit */
1277                 if (!priv->comm_is_ok)
1278                         break;
1279                 usb_clear_halt(port->serial->dev, 0x02);
1280                 /* error in the urb, so we have to resubmit it */
1281                 dev_dbg(dev, "%s - nonzero write bulk status received: %d\n",
1282                         __func__, status);
1283                 port->interrupt_out_urb->transfer_buffer_length = 1;
1284                 result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC);
1285                 if (!result)
1286                         return;
1287                 dev_err(dev, "%s - failed resubmitting write urb, error %d\n",
1288                         __func__, result);
1289                 cypress_set_dead(port);
1290                 break;
1291         default:
1292                 dev_err(dev, "%s - unexpected nonzero write status received: %d\n",
1293                         __func__, status);
1294                 cypress_set_dead(port);
1295                 break;
1296         }
1297         priv->write_urb_in_use = 0;
1298
1299         /* send any buffered data */
1300         cypress_send(port);
1301 }
1302
1303 module_usb_serial_driver(serial_drivers, id_table_combined);
1304
1305 MODULE_AUTHOR(DRIVER_AUTHOR);
1306 MODULE_DESCRIPTION(DRIVER_DESC);
1307 MODULE_VERSION(DRIVER_VERSION);
1308 MODULE_LICENSE("GPL");
1309
1310 module_param(stats, bool, S_IRUGO | S_IWUSR);
1311 MODULE_PARM_DESC(stats, "Enable statistics or not");
1312 module_param(interval, int, S_IRUGO | S_IWUSR);
1313 MODULE_PARM_DESC(interval, "Overrides interrupt interval");
1314 module_param(unstable_bauds, bool, S_IRUGO | S_IWUSR);
1315 MODULE_PARM_DESC(unstable_bauds, "Allow unstable baud rates");