drivers/usb/serial/cypress_m8.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * USB Cypress M8 driver
   4  *
   5  *      Copyright (C) 2004
   6  *          Lonnie Mendez (dignome@gmail.com)
   7  *      Copyright (C) 2003,2004
   8  *          Neil Whelchel (koyama@firstlight.net)
   9  *
  10  * See Documentation/usb/usb-serial.txt for more information on using this
  11  * driver
  12  *
  13  * See http://geocities.com/i0xox0i for information on this driver and the
  14  * earthmate usb device.
  15  */
  16
  17 /* Thanks to Neil Whelchel for writing the first cypress m8 implementation
  18    for linux. */
  19 /* Thanks to cypress for providing references for the hid reports. */
  20 /* Thanks to Jiang Zhang for providing links and for general help. */
  21 /* Code originates and was built up from ftdi_sio, belkin, pl2303 and others.*/
  22
  23
  24 #include <linux/kernel.h>
  25 #include <linux/errno.h>
  26 #include <linux/slab.h>
  27 #include <linux/tty.h>
  28 #include <linux/tty_driver.h>
  29 #include <linux/tty_flip.h>
  30 #include <linux/module.h>
  31 #include <linux/moduleparam.h>
  32 #include <linux/spinlock.h>
  33 #include <linux/usb.h>
  34 #include <linux/usb/serial.h>
  35 #include <linux/serial.h>
  36 #include <linux/kfifo.h>
  37 #include <linux/delay.h>
  38 #include <linux/uaccess.h>
  39 #include <asm/unaligned.h>
  40
  41 #include "cypress_m8.h"
  42
  43
  44 static bool stats;
  45 static int interval;
  46 static bool unstable_bauds;
  47
  48 #define DRIVER_AUTHOR "Lonnie Mendez <dignome@gmail.com>, Neil Whelchel <koyama@firstlight.net>"
  49 #define DRIVER_DESC "Cypress USB to Serial Driver"
  50
  51 /* write buffer size defines */
  52 #define CYPRESS_BUF_SIZE        1024
  53
  54 static const struct usb_device_id id_table_earthmate[] = {
  55         { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
  56         { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
  57         { }                                             /* Terminating entry */
  58 };
  59
  60 static const struct usb_device_id id_table_cyphidcomrs232[] = {
  61         { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
  62         { USB_DEVICE(VENDOR_ID_SAI, PRODUCT_ID_CYPHIDCOM) },
  63         { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) },
  64         { USB_DEVICE(VENDOR_ID_FRWD, PRODUCT_ID_CYPHIDCOM_FRWD) },
  65         { }                                             /* Terminating entry */
  66 };
  67
  68 static const struct usb_device_id id_table_nokiaca42v2[] = {
  69         { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
  70         { }                                             /* Terminating entry */
  71 };
  72
  73 static const struct usb_device_id id_table_combined[] = {
  74         { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
  75         { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
  76         { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
  77         { USB_DEVICE(VENDOR_ID_SAI, PRODUCT_ID_CYPHIDCOM) },
  78         { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) },
  79         { USB_DEVICE(VENDOR_ID_FRWD, PRODUCT_ID_CYPHIDCOM_FRWD) },
  80         { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
  81         { }                                             /* Terminating entry */
  82 };
  83
  84 MODULE_DEVICE_TABLE(usb, id_table_combined);
  85
  86 enum packet_format {
  87         packet_format_1,  /* b0:status, b1:payload count */
  88         packet_format_2   /* b0[7:3]:status, b0[2:0]:payload count */
  89 };
  90
  91 struct cypress_private {
  92         spinlock_t lock;                   /* private lock */
  93         int chiptype;                      /* identifier of device, for quirks/etc */
  94         int bytes_in;                      /* used for statistics */
  95         int bytes_out;                     /* used for statistics */
  96         int cmd_count;                     /* used for statistics */
  97         int cmd_ctrl;                      /* always set this to 1 before issuing a command */
  98         struct kfifo write_fifo;           /* write fifo */
  99         int write_urb_in_use;              /* write urb in use indicator */
 100         int write_urb_interval;            /* interval to use for write urb */
 101         int read_urb_interval;             /* interval to use for read urb */
 102         int comm_is_ok;                    /* true if communication is (still) ok */
 103         int termios_initialized;
 104         __u8 line_control;                 /* holds dtr / rts value */
 105         __u8 current_status;               /* received from last read - info on dsr,cts,cd,ri,etc */
 106         __u8 current_config;               /* stores the current configuration byte */
 107         __u8 rx_flags;                     /* throttling - used from whiteheat/ftdi_sio */
 108         enum packet_format pkt_fmt;        /* format to use for packet send / receive */
 109         int get_cfg_unsafe;                /* If true, the CYPRESS_GET_CONFIG is unsafe */
 110         int baud_rate;                     /* stores current baud rate in
 111                                               integer form */
 112         int isthrottled;                   /* if throttled, discard reads */
 113         char prev_status;                  /* used for TIOCMIWAIT */
 114         /* we pass a pointer to this as the argument sent to
 115            cypress_set_termios old_termios */
 116         struct ktermios tmp_termios;       /* stores the old termios settings */
 117 };
 118
 119 /* function prototypes for the Cypress USB to serial device */
 120 static int  cypress_earthmate_port_probe(struct usb_serial_port *port);
 121 static int  cypress_hidcom_port_probe(struct usb_serial_port *port);
 122 static int  cypress_ca42v2_port_probe(struct usb_serial_port *port);
 123 static int  cypress_port_remove(struct usb_serial_port *port);
 124 static int  cypress_open(struct tty_struct *tty, struct usb_serial_port *port);
 125 static void cypress_close(struct usb_serial_port *port);
 126 static void cypress_dtr_rts(struct usb_serial_port *port, int on);
 127 static int  cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
 128                         const unsigned char *buf, int count);
 129 static void cypress_send(struct usb_serial_port *port);
 130 static int  cypress_write_room(struct tty_struct *tty);
 131 static void cypress_set_termios(struct tty_struct *tty,
 132                         struct usb_serial_port *port, struct ktermios *old);
 133 static int  cypress_tiocmget(struct tty_struct *tty);
 134 static int  cypress_tiocmset(struct tty_struct *tty,
 135                         unsigned int set, unsigned int clear);
 136 static int  cypress_chars_in_buffer(struct tty_struct *tty);
 137 static void cypress_throttle(struct tty_struct *tty);
 138 static void cypress_unthrottle(struct tty_struct *tty);
 139 static void cypress_set_dead(struct usb_serial_port *port);
 140 static void cypress_read_int_callback(struct urb *urb);
 141 static void cypress_write_int_callback(struct urb *urb);
 142
 143 static struct usb_serial_driver cypress_earthmate_device = {
 144         .driver = {
 145                 .owner =                THIS_MODULE,
 146                 .name =                 "earthmate",
 147         },
 148         .description =                  "DeLorme Earthmate USB",
 149         .id_table =                     id_table_earthmate,
 150         .num_ports =                    1,
 151         .port_probe =                   cypress_earthmate_port_probe,
 152         .port_remove =                  cypress_port_remove,
 153         .open =                         cypress_open,
 154         .close =                        cypress_close,
 155         .dtr_rts =                      cypress_dtr_rts,
 156         .write =                        cypress_write,
 157         .write_room =                   cypress_write_room,
 158         .set_termios =                  cypress_set_termios,
 159         .tiocmget =                     cypress_tiocmget,
 160         .tiocmset =                     cypress_tiocmset,
 161         .tiocmiwait =                   usb_serial_generic_tiocmiwait,
 162         .chars_in_buffer =              cypress_chars_in_buffer,
 163         .throttle =                     cypress_throttle,
 164         .unthrottle =                   cypress_unthrottle,
 165         .read_int_callback =            cypress_read_int_callback,
 166         .write_int_callback =           cypress_write_int_callback,
 167 };
 168
 169 static struct usb_serial_driver cypress_hidcom_device = {
 170         .driver = {
 171                 .owner =                THIS_MODULE,
 172                 .name =                 "cyphidcom",
 173         },
 174         .description =                  "HID->COM RS232 Adapter",
 175         .id_table =                     id_table_cyphidcomrs232,
 176         .num_ports =                    1,
 177         .port_probe =                   cypress_hidcom_port_probe,
 178         .port_remove =                  cypress_port_remove,
 179         .open =                         cypress_open,
 180         .close =                        cypress_close,
 181         .dtr_rts =                      cypress_dtr_rts,
 182         .write =                        cypress_write,
 183         .write_room =                   cypress_write_room,
 184         .set_termios =                  cypress_set_termios,
 185         .tiocmget =                     cypress_tiocmget,
 186         .tiocmset =                     cypress_tiocmset,
 187         .tiocmiwait =                   usb_serial_generic_tiocmiwait,
 188         .chars_in_buffer =              cypress_chars_in_buffer,
 189         .throttle =                     cypress_throttle,
 190         .unthrottle =                   cypress_unthrottle,
 191         .read_int_callback =            cypress_read_int_callback,
 192         .write_int_callback =           cypress_write_int_callback,
 193 };
 194
 195 static struct usb_serial_driver cypress_ca42v2_device = {
 196         .driver = {
 197                 .owner =                THIS_MODULE,
 198                 .name =                 "nokiaca42v2",
 199         },
 200         .description =                  "Nokia CA-42 V2 Adapter",
 201         .id_table =                     id_table_nokiaca42v2,
 202         .num_ports =                    1,
 203         .port_probe =                   cypress_ca42v2_port_probe,
 204         .port_remove =                  cypress_port_remove,
 205         .open =                         cypress_open,
 206         .close =                        cypress_close,
 207         .dtr_rts =                      cypress_dtr_rts,
 208         .write =                        cypress_write,
 209         .write_room =                   cypress_write_room,
 210         .set_termios =                  cypress_set_termios,
 211         .tiocmget =                     cypress_tiocmget,
 212         .tiocmset =                     cypress_tiocmset,
 213         .tiocmiwait =                   usb_serial_generic_tiocmiwait,
 214         .chars_in_buffer =              cypress_chars_in_buffer,
 215         .throttle =                     cypress_throttle,
 216         .unthrottle =                   cypress_unthrottle,
 217         .read_int_callback =            cypress_read_int_callback,
 218         .write_int_callback =           cypress_write_int_callback,
 219 };
 220
 221 static struct usb_serial_driver * const serial_drivers[] = {
 222         &cypress_earthmate_device, &cypress_hidcom_device,
 223         &cypress_ca42v2_device, NULL
 224 };
 225
 226 /*****************************************************************************
 227  * Cypress serial helper functions
 228  *****************************************************************************/
 229
 230 /* FRWD Dongle hidcom needs to skip reset and speed checks */
 231 static inline bool is_frwd(struct usb_device *dev)
 232 {
 233         return ((le16_to_cpu(dev->descriptor.idVendor) == VENDOR_ID_FRWD) &&
 234                 (le16_to_cpu(dev->descriptor.idProduct) == PRODUCT_ID_CYPHIDCOM_FRWD));
 235 }
 236
 237 static int analyze_baud_rate(struct usb_serial_port *port, speed_t new_rate)
 238 {
 239         struct cypress_private *priv;
 240         priv = usb_get_serial_port_data(port);
 241
 242         if (unstable_bauds)
 243                 return new_rate;
 244
 245         /* FRWD Dongle uses 115200 bps */
 246         if (is_frwd(port->serial->dev))
 247                 return new_rate;
 248
 249         /*
 250          * The general purpose firmware for the Cypress M8 allows for
 251          * a maximum speed of 57600bps (I have no idea whether DeLorme
 252          * chose to use the general purpose firmware or not), if you
 253          * need to modify this speed setting for your own project
 254          * please add your own chiptype and modify the code likewise.
 255          * The Cypress HID->COM device will work successfully up to
 256          * 115200bps (but the actual throughput is around 3kBps).
 257          */
 258         if (port->serial->dev->speed == USB_SPEED_LOW) {
 259                 /*
 260                  * Mike Isely <isely@pobox.com> 2-Feb-2008: The
 261                  * Cypress app note that describes this mechanism
 262                  * states the the low-speed part can't handle more
 263                  * than 800 bytes/sec, in which case 4800 baud is the
 264                  * safest speed for a part like that.
 265                  */
 266                 if (new_rate > 4800) {
 267                         dev_dbg(&port->dev,
 268                                 "%s - failed setting baud rate, device incapable speed %d\n",
 269                                 __func__, new_rate);
 270                         return -1;
 271                 }
 272         }
 273         switch (priv->chiptype) {
 274         case CT_EARTHMATE:
 275                 if (new_rate <= 600) {
 276                         /* 300 and 600 baud rates are supported under
 277                          * the generic firmware, but are not used with
 278                          * NMEA and SiRF protocols */
 279                         dev_dbg(&port->dev,
 280                                 "%s - failed setting baud rate, unsupported speed of %d on Earthmate GPS\n",
 281                                 __func__, new_rate);
 282                         return -1;
 283                 }
 284                 break;
 285         default:
 286                 break;
 287         }
 288         return new_rate;
 289 }
 290
 291
 292 /* This function can either set or retrieve the current serial line settings */
 293 static int cypress_serial_control(struct tty_struct *tty,
 294         struct usb_serial_port *port, speed_t baud_rate, int data_bits,
 295         int stop_bits, int parity_enable, int parity_type, int reset,
 296         int cypress_request_type)
 297 {
 298         int new_baudrate = 0, retval = 0, tries = 0;
 299         struct cypress_private *priv;
 300         struct device *dev = &port->dev;
 301         u8 *feature_buffer;
 302         const unsigned int feature_len = 5;
 303         unsigned long flags;
 304
 305         priv = usb_get_serial_port_data(port);
 306
 307         if (!priv->comm_is_ok)
 308                 return -ENODEV;
 309
 310         feature_buffer = kcalloc(feature_len, sizeof(u8), GFP_KERNEL);
 311         if (!feature_buffer)
 312                 return -ENOMEM;
 313
 314         switch (cypress_request_type) {
 315         case CYPRESS_SET_CONFIG:
 316                 /* 0 means 'Hang up' so doesn't change the true bit rate */
 317                 new_baudrate = priv->baud_rate;
 318                 if (baud_rate && baud_rate != priv->baud_rate) {
 319                         dev_dbg(dev, "%s - baud rate is changing\n", __func__);
 320                         retval = analyze_baud_rate(port, baud_rate);
 321                         if (retval >= 0) {
 322                                 new_baudrate = retval;
 323                                 dev_dbg(dev, "%s - New baud rate set to %d\n",
 324                                         __func__, new_baudrate);
 325                         }
 326                 }
 327                 dev_dbg(dev, "%s - baud rate is being sent as %d\n", __func__,
 328                         new_baudrate);
 329
 330                 /* fill the feature_buffer with new configuration */
 331                 put_unaligned_le32(new_baudrate, feature_buffer);
 332                 feature_buffer[4] |= data_bits;   /* assign data bits in 2 bit space ( max 3 ) */
 333                 /* 1 bit gap */
 334                 feature_buffer[4] |= (stop_bits << 3);   /* assign stop bits in 1 bit space */
 335                 feature_buffer[4] |= (parity_enable << 4);   /* assign parity flag in 1 bit space */
 336                 feature_buffer[4] |= (parity_type << 5);   /* assign parity type in 1 bit space */
 337                 /* 1 bit gap */
 338                 feature_buffer[4] |= (reset << 7);   /* assign reset at end of byte, 1 bit space */
 339
 340                 dev_dbg(dev, "%s - device is being sent this feature report:\n", __func__);
 341                 dev_dbg(dev, "%s - %02X - %02X - %02X - %02X - %02X\n", __func__,
 342                         feature_buffer[0], feature_buffer[1],
 343                         feature_buffer[2], feature_buffer[3],
 344                         feature_buffer[4]);
 345
 346                 do {
 347                         retval = usb_control_msg(port->serial->dev,
 348                                         usb_sndctrlpipe(port->serial->dev, 0),
 349                                         HID_REQ_SET_REPORT,
 350                                         USB_DIR_OUT | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
 351                                         0x0300, 0, feature_buffer,
 352                                         feature_len, 500);
 353
 354                         if (tries++ >= 3)
 355                                 break;
 356
 357                 } while (retval != feature_len &&
 358                          retval != -ENODEV);
 359
 360                 if (retval != feature_len) {
 361                         dev_err(dev, "%s - failed sending serial line settings - %d\n",
 362                                 __func__, retval);
 363                         cypress_set_dead(port);
 364                 } else {
 365                         spin_lock_irqsave(&priv->lock, flags);
 366                         priv->baud_rate = new_baudrate;
 367                         priv->current_config = feature_buffer[4];
 368                         spin_unlock_irqrestore(&priv->lock, flags);
 369                         /* If we asked for a speed change encode it */
 370                         if (baud_rate)
 371                                 tty_encode_baud_rate(tty,
 372                                         new_baudrate, new_baudrate);
 373                 }
 374         break;
 375         case CYPRESS_GET_CONFIG:
 376                 if (priv->get_cfg_unsafe) {
 377                         /* Not implemented for this device,
 378                            and if we try to do it we're likely
 379                            to crash the hardware. */
 380                         retval = -ENOTTY;
 381                         goto out;
 382                 }
 383                 dev_dbg(dev, "%s - retreiving serial line settings\n", __func__);
 384                 do {
 385                         retval = usb_control_msg(port->serial->dev,
 386                                         usb_rcvctrlpipe(port->serial->dev, 0),
 387                                         HID_REQ_GET_REPORT,
 388                                         USB_DIR_IN | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
 389                                         0x0300, 0, feature_buffer,
 390                                         feature_len, 500);
 391
 392                         if (tries++ >= 3)
 393                                 break;
 394                 } while (retval != feature_len
 395                                                 && retval != -ENODEV);
 396
 397                 if (retval != feature_len) {
 398                         dev_err(dev, "%s - failed to retrieve serial line settings - %d\n",
 399                                 __func__, retval);
 400                         cypress_set_dead(port);
 401                         goto out;
 402                 } else {
 403                         spin_lock_irqsave(&priv->lock, flags);
 404                         /* store the config in one byte, and later
 405                            use bit masks to check values */
 406                         priv->current_config = feature_buffer[4];
 407                         priv->baud_rate = get_unaligned_le32(feature_buffer);
 408                         spin_unlock_irqrestore(&priv->lock, flags);
 409                 }
 410         }
 411         spin_lock_irqsave(&priv->lock, flags);
 412         ++priv->cmd_count;
 413         spin_unlock_irqrestore(&priv->lock, flags);
 414 out:
 415         kfree(feature_buffer);
 416         return retval;
 417 } /* cypress_serial_control */
 418
 419
 420 static void cypress_set_dead(struct usb_serial_port *port)
 421 {
 422         struct cypress_private *priv = usb_get_serial_port_data(port);
 423         unsigned long flags;
 424
 425         spin_lock_irqsave(&priv->lock, flags);
 426         if (!priv->comm_is_ok) {
 427                 spin_unlock_irqrestore(&priv->lock, flags);
 428                 return;
 429         }
 430         priv->comm_is_ok = 0;
 431         spin_unlock_irqrestore(&priv->lock, flags);
 432
 433         dev_err(&port->dev, "cypress_m8 suspending failing port %d - "
 434                 "interval might be too short\n", port->port_number);
 435 }
 436
 437
 438 /*****************************************************************************
 439  * Cypress serial driver functions
 440  *****************************************************************************/
 441
 442
 443 static int cypress_generic_port_probe(struct usb_serial_port *port)
 444 {
 445         struct usb_serial *serial = port->serial;
 446         struct cypress_private *priv;
 447
 448         if (!port->interrupt_out_urb || !port->interrupt_in_urb) {
 449                 dev_err(&port->dev, "required endpoint is missing\n");
 450                 return -ENODEV;
 451         }
 452
 453         priv = kzalloc(sizeof(struct cypress_private), GFP_KERNEL);
 454         if (!priv)
 455                 return -ENOMEM;
 456
 457         priv->comm_is_ok = !0;
 458         spin_lock_init(&priv->lock);
 459         if (kfifo_alloc(&priv->write_fifo, CYPRESS_BUF_SIZE, GFP_KERNEL)) {
 460                 kfree(priv);
 461                 return -ENOMEM;
 462         }
 463
 464         /* Skip reset for FRWD device. It is a workaound:
 465            device hangs if it receives SET_CONFIGURE in Configured
 466            state. */
 467         if (!is_frwd(serial->dev))
 468                 usb_reset_configuration(serial->dev);
 469
 470         priv->cmd_ctrl = 0;
 471         priv->line_control = 0;
 472         priv->termios_initialized = 0;
 473         priv->rx_flags = 0;
 474         /* Default packet format setting is determined by packet size.
 475            Anything with a size larger then 9 must have a separate
 476            count field since the 3 bit count field is otherwise too
 477            small.  Otherwise we can use the slightly more compact
 478            format.  This is in accordance with the cypress_m8 serial
 479            converter app note. */
 480         if (port->interrupt_out_size > 9)
 481                 priv->pkt_fmt = packet_format_1;
 482         else
 483                 priv->pkt_fmt = packet_format_2;
 484
 485         if (interval > 0) {
 486                 priv->write_urb_interval = interval;
 487                 priv->read_urb_interval = interval;
 488                 dev_dbg(&port->dev, "%s - read & write intervals forced to %d\n",
 489                         __func__, interval);
 490         } else {
 491                 priv->write_urb_interval = port->interrupt_out_urb->interval;
 492                 priv->read_urb_interval = port->interrupt_in_urb->interval;
 493                 dev_dbg(&port->dev, "%s - intervals: read=%d write=%d\n",
 494                         __func__, priv->read_urb_interval,
 495                         priv->write_urb_interval);
 496         }
 497         usb_set_serial_port_data(port, priv);
 498
 499         port->port.drain_delay = 256;
 500
 501         return 0;
 502 }
 503
 504
 505 static int cypress_earthmate_port_probe(struct usb_serial_port *port)
 506 {
 507         struct usb_serial *serial = port->serial;
 508         struct cypress_private *priv;
 509         int ret;
 510
 511         ret = cypress_generic_port_probe(port);
 512         if (ret) {
 513                 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
 514                 return ret;
 515         }
 516
 517         priv = usb_get_serial_port_data(port);
 518         priv->chiptype = CT_EARTHMATE;
 519         /* All Earthmate devices use the separated-count packet
 520            format!  Idiotic. */
 521         priv->pkt_fmt = packet_format_1;
 522         if (serial->dev->descriptor.idProduct !=
 523                                 cpu_to_le16(PRODUCT_ID_EARTHMATEUSB)) {
 524                 /* The old original USB Earthmate seemed able to
 525                    handle GET_CONFIG requests; everything they've
 526                    produced since that time crashes if this command is
 527                    attempted :-( */
 528                 dev_dbg(&port->dev,
 529                         "%s - Marking this device as unsafe for GET_CONFIG commands\n",
 530                         __func__);
 531                 priv->get_cfg_unsafe = !0;
 532         }
 533
 534         return 0;
 535 }
 536
 537 static int cypress_hidcom_port_probe(struct usb_serial_port *port)
 538 {
 539         struct cypress_private *priv;
 540         int ret;
 541
 542         ret = cypress_generic_port_probe(port);
 543         if (ret) {
 544                 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
 545                 return ret;
 546         }
 547
 548         priv = usb_get_serial_port_data(port);
 549         priv->chiptype = CT_CYPHIDCOM;
 550
 551         return 0;
 552 }
 553
 554 static int cypress_ca42v2_port_probe(struct usb_serial_port *port)
 555 {
 556         struct cypress_private *priv;
 557         int ret;
 558
 559         ret = cypress_generic_port_probe(port);
 560         if (ret) {
 561                 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
 562                 return ret;
 563         }
 564
 565         priv = usb_get_serial_port_data(port);
 566         priv->chiptype = CT_CA42V2;
 567
 568         return 0;
 569 }
 570
 571 static int cypress_port_remove(struct usb_serial_port *port)
 572 {
 573         struct cypress_private *priv;
 574
 575         priv = usb_get_serial_port_data(port);
 576
 577         kfifo_free(&priv->write_fifo);
 578         kfree(priv);
 579
 580         return 0;
 581 }
 582
 583 static int cypress_open(struct tty_struct *tty, struct usb_serial_port *port)
 584 {
 585         struct cypress_private *priv = usb_get_serial_port_data(port);
 586         struct usb_serial *serial = port->serial;
 587         unsigned long flags;
 588         int result = 0;
 589
 590         if (!priv->comm_is_ok)
 591                 return -EIO;
 592
 593         /* clear halts before open */
 594         usb_clear_halt(serial->dev, 0x81);
 595         usb_clear_halt(serial->dev, 0x02);
 596
 597         spin_lock_irqsave(&priv->lock, flags);
 598         /* reset read/write statistics */
 599         priv->bytes_in = 0;
 600         priv->bytes_out = 0;
 601         priv->cmd_count = 0;
 602         priv->rx_flags = 0;
 603         spin_unlock_irqrestore(&priv->lock, flags);
 604
 605         /* Set termios */
 606         cypress_send(port);
 607
 608         if (tty)
 609                 cypress_set_termios(tty, port, &priv->tmp_termios);
 610
 611         /* setup the port and start reading from the device */
 612         usb_fill_int_urb(port->interrupt_in_urb, serial->dev,
 613                 usb_rcvintpipe(serial->dev, port->interrupt_in_endpointAddress),
 614                 port->interrupt_in_urb->transfer_buffer,
 615                 port->interrupt_in_urb->transfer_buffer_length,
 616                 cypress_read_int_callback, port, priv->read_urb_interval);
 617         result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
 618
 619         if (result) {
 620                 dev_err(&port->dev,
 621                         "%s - failed submitting read urb, error %d\n",
 622                                                         __func__, result);
 623                 cypress_set_dead(port);
 624         }
 625
 626         return result;
 627 } /* cypress_open */
 628
 629 static void cypress_dtr_rts(struct usb_serial_port *port, int on)
 630 {
 631         struct cypress_private *priv = usb_get_serial_port_data(port);
 632         /* drop dtr and rts */
 633         spin_lock_irq(&priv->lock);
 634         if (on == 0)
 635                 priv->line_control = 0;
 636         else
 637                 priv->line_control = CONTROL_DTR | CONTROL_RTS;
 638         priv->cmd_ctrl = 1;
 639         spin_unlock_irq(&priv->lock);
 640         cypress_write(NULL, port, NULL, 0);
 641 }
 642
 643 static void cypress_close(struct usb_serial_port *port)
 644 {
 645         struct cypress_private *priv = usb_get_serial_port_data(port);
 646         unsigned long flags;
 647
 648         spin_lock_irqsave(&priv->lock, flags);
 649         kfifo_reset_out(&priv->write_fifo);
 650         spin_unlock_irqrestore(&priv->lock, flags);
 651
 652         dev_dbg(&port->dev, "%s - stopping urbs\n", __func__);
 653         usb_kill_urb(port->interrupt_in_urb);
 654         usb_kill_urb(port->interrupt_out_urb);
 655
 656         if (stats)
 657                 dev_info(&port->dev, "Statistics: %d Bytes In | %d Bytes Out | %d Commands Issued\n",
 658                         priv->bytes_in, priv->bytes_out, priv->cmd_count);
 659 } /* cypress_close */
 660
 661
 662 static int cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
 663                                         const unsigned char *buf, int count)
 664 {
 665         struct cypress_private *priv = usb_get_serial_port_data(port);
 666
 667         dev_dbg(&port->dev, "%s - %d bytes\n", __func__, count);
 668
 669         /* line control commands, which need to be executed immediately,
 670            are not put into the buffer for obvious reasons.
 671          */
 672         if (priv->cmd_ctrl) {
 673                 count = 0;
 674                 goto finish;
 675         }
 676
 677         if (!count)
 678                 return count;
 679
 680         count = kfifo_in_locked(&priv->write_fifo, buf, count, &priv->lock);
 681
 682 finish:
 683         cypress_send(port);
 684
 685         return count;
 686 } /* cypress_write */
 687
 688
 689 static void cypress_send(struct usb_serial_port *port)
 690 {
 691         int count = 0, result, offset, actual_size;
 692         struct cypress_private *priv = usb_get_serial_port_data(port);
 693         struct device *dev = &port->dev;
 694         unsigned long flags;
 695
 696         if (!priv->comm_is_ok)
 697                 return;
 698
 699         dev_dbg(dev, "%s - interrupt out size is %d\n", __func__,
 700                 port->interrupt_out_size);
 701
 702         spin_lock_irqsave(&priv->lock, flags);
 703         if (priv->write_urb_in_use) {
 704                 dev_dbg(dev, "%s - can't write, urb in use\n", __func__);
 705                 spin_unlock_irqrestore(&priv->lock, flags);
 706                 return;
 707         }
 708         spin_unlock_irqrestore(&priv->lock, flags);
 709
 710         /* clear buffer */
 711         memset(port->interrupt_out_urb->transfer_buffer, 0,
 712                                                 port->interrupt_out_size);
 713
 714         spin_lock_irqsave(&priv->lock, flags);
 715         switch (priv->pkt_fmt) {
 716         default:
 717         case packet_format_1:
 718                 /* this is for the CY7C64013... */
 719                 offset = 2;
 720                 port->interrupt_out_buffer[0] = priv->line_control;
 721                 break;
 722         case packet_format_2:
 723                 /* this is for the CY7C63743... */
 724                 offset = 1;
 725                 port->interrupt_out_buffer[0] = priv->line_control;
 726                 break;
 727         }
 728
 729         if (priv->line_control & CONTROL_RESET)
 730                 priv->line_control &= ~CONTROL_RESET;
 731
 732         if (priv->cmd_ctrl) {
 733                 priv->cmd_count++;
 734                 dev_dbg(dev, "%s - line control command being issued\n", __func__);
 735                 spin_unlock_irqrestore(&priv->lock, flags);
 736                 goto send;
 737         } else
 738                 spin_unlock_irqrestore(&priv->lock, flags);
 739
 740         count = kfifo_out_locked(&priv->write_fifo,
 741                                         &port->interrupt_out_buffer[offset],
 742                                         port->interrupt_out_size - offset,
 743                                         &priv->lock);
 744         if (count == 0)
 745                 return;
 746
 747         switch (priv->pkt_fmt) {
 748         default:
 749         case packet_format_1:
 750                 port->interrupt_out_buffer[1] = count;
 751                 break;
 752         case packet_format_2:
 753                 port->interrupt_out_buffer[0] |= count;
 754         }
 755
 756         dev_dbg(dev, "%s - count is %d\n", __func__, count);
 757
 758 send:
 759         spin_lock_irqsave(&priv->lock, flags);
 760         priv->write_urb_in_use = 1;
 761         spin_unlock_irqrestore(&priv->lock, flags);
 762
 763         if (priv->cmd_ctrl)
 764                 actual_size = 1;
 765         else
 766                 actual_size = count +
 767                               (priv->pkt_fmt == packet_format_1 ? 2 : 1);
 768
 769         usb_serial_debug_data(dev, __func__, port->interrupt_out_size,
 770                               port->interrupt_out_urb->transfer_buffer);
 771
 772         usb_fill_int_urb(port->interrupt_out_urb, port->serial->dev,
 773                 usb_sndintpipe(port->serial->dev, port->interrupt_out_endpointAddress),
 774                 port->interrupt_out_buffer, actual_size,
 775                 cypress_write_int_callback, port, priv->write_urb_interval);
 776         result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC);
 777         if (result) {
 778                 dev_err_console(port,
 779                                 "%s - failed submitting write urb, error %d\n",
 780                                                         __func__, result);
 781                 priv->write_urb_in_use = 0;
 782                 cypress_set_dead(port);
 783         }
 784
 785         spin_lock_irqsave(&priv->lock, flags);
 786         if (priv->cmd_ctrl)
 787                 priv->cmd_ctrl = 0;
 788
 789         /* do not count the line control and size bytes */
 790         priv->bytes_out += count;
 791         spin_unlock_irqrestore(&priv->lock, flags);
 792
 793         usb_serial_port_softint(port);
 794 } /* cypress_send */
 795
 796
 797 /* returns how much space is available in the soft buffer */
 798 static int cypress_write_room(struct tty_struct *tty)
 799 {
 800         struct usb_serial_port *port = tty->driver_data;
 801         struct cypress_private *priv = usb_get_serial_port_data(port);
 802         int room = 0;
 803         unsigned long flags;
 804
 805         spin_lock_irqsave(&priv->lock, flags);
 806         room = kfifo_avail(&priv->write_fifo);
 807         spin_unlock_irqrestore(&priv->lock, flags);
 808
 809         dev_dbg(&port->dev, "%s - returns %d\n", __func__, room);
 810         return room;
 811 }
 812
 813
 814 static int cypress_tiocmget(struct tty_struct *tty)
 815 {
 816         struct usb_serial_port *port = tty->driver_data;
 817         struct cypress_private *priv = usb_get_serial_port_data(port);
 818         __u8 status, control;
 819         unsigned int result = 0;
 820         unsigned long flags;
 821
 822         spin_lock_irqsave(&priv->lock, flags);
 823         control = priv->line_control;
 824         status = priv->current_status;
 825         spin_unlock_irqrestore(&priv->lock, flags);
 826
 827         result = ((control & CONTROL_DTR)        ? TIOCM_DTR : 0)
 828                 | ((control & CONTROL_RTS)       ? TIOCM_RTS : 0)
 829                 | ((status & UART_CTS)        ? TIOCM_CTS : 0)
 830                 | ((status & UART_DSR)        ? TIOCM_DSR : 0)
 831                 | ((status & UART_RI)         ? TIOCM_RI  : 0)
 832                 | ((status & UART_CD)         ? TIOCM_CD  : 0);
 833
 834         dev_dbg(&port->dev, "%s - result = %x\n", __func__, result);
 835
 836         return result;
 837 }
 838
 839
 840 static int cypress_tiocmset(struct tty_struct *tty,
 841                                unsigned int set, unsigned int clear)
 842 {
 843         struct usb_serial_port *port = tty->driver_data;
 844         struct cypress_private *priv = usb_get_serial_port_data(port);
 845         unsigned long flags;
 846
 847         spin_lock_irqsave(&priv->lock, flags);
 848         if (set & TIOCM_RTS)
 849                 priv->line_control |= CONTROL_RTS;
 850         if (set & TIOCM_DTR)
 851                 priv->line_control |= CONTROL_DTR;
 852         if (clear & TIOCM_RTS)
 853                 priv->line_control &= ~CONTROL_RTS;
 854         if (clear & TIOCM_DTR)
 855                 priv->line_control &= ~CONTROL_DTR;
 856         priv->cmd_ctrl = 1;
 857         spin_unlock_irqrestore(&priv->lock, flags);
 858
 859         return cypress_write(tty, port, NULL, 0);
 860 }
 861
 862 static void cypress_set_termios(struct tty_struct *tty,
 863         struct usb_serial_port *port, struct ktermios *old_termios)
 864 {
 865         struct cypress_private *priv = usb_get_serial_port_data(port);
 866         struct device *dev = &port->dev;
 867         int data_bits, stop_bits, parity_type, parity_enable;
 868         unsigned cflag, iflag;
 869         unsigned long flags;
 870         __u8 oldlines;
 871         int linechange = 0;
 872
 873         spin_lock_irqsave(&priv->lock, flags);
 874         /* We can't clean this one up as we don't know the device type
 875            early enough */
 876         if (!priv->termios_initialized) {
 877                 if (priv->chiptype == CT_EARTHMATE) {
 878                         tty->termios = tty_std_termios;
 879                         tty->termios.c_cflag = B4800 | CS8 | CREAD | HUPCL |
 880                                 CLOCAL;
 881                         tty->termios.c_ispeed = 4800;
 882                         tty->termios.c_ospeed = 4800;
 883                 } else if (priv->chiptype == CT_CYPHIDCOM) {
 884                         tty->termios = tty_std_termios;
 885                         tty->termios.c_cflag = B9600 | CS8 | CREAD | HUPCL |
 886                                 CLOCAL;
 887                         tty->termios.c_ispeed = 9600;
 888                         tty->termios.c_ospeed = 9600;
 889                 } else if (priv->chiptype == CT_CA42V2) {
 890                         tty->termios = tty_std_termios;
 891                         tty->termios.c_cflag = B9600 | CS8 | CREAD | HUPCL |
 892                                 CLOCAL;
 893                         tty->termios.c_ispeed = 9600;
 894                         tty->termios.c_ospeed = 9600;
 895                 }
 896                 priv->termios_initialized = 1;
 897         }
 898         spin_unlock_irqrestore(&priv->lock, flags);
 899
 900         /* Unsupported features need clearing */
 901         tty->termios.c_cflag &= ~(CMSPAR|CRTSCTS);
 902
 903         cflag = tty->termios.c_cflag;
 904         iflag = tty->termios.c_iflag;
 905
 906         /* check if there are new settings */
 907         if (old_termios) {
 908                 spin_lock_irqsave(&priv->lock, flags);
 909                 priv->tmp_termios = tty->termios;
 910                 spin_unlock_irqrestore(&priv->lock, flags);
 911         }
 912
 913         /* set number of data bits, parity, stop bits */
 914         /* when parity is disabled the parity type bit is ignored */
 915
 916         /* 1 means 2 stop bits, 0 means 1 stop bit */
 917         stop_bits = cflag & CSTOPB ? 1 : 0;
 918
 919         if (cflag & PARENB) {
 920                 parity_enable = 1;
 921                 /* 1 means odd parity, 0 means even parity */
 922                 parity_type = cflag & PARODD ? 1 : 0;
 923         } else
 924                 parity_enable = parity_type = 0;
 925
 926         switch (cflag & CSIZE) {
 927         case CS5:
 928                 data_bits = 0;
 929                 break;
 930         case CS6:
 931                 data_bits = 1;
 932                 break;
 933         case CS7:
 934                 data_bits = 2;
 935                 break;
 936         case CS8:
 937                 data_bits = 3;
 938                 break;
 939         default:
 940                 dev_err(dev, "%s - CSIZE was set, but not CS5-CS8\n", __func__);
 941                 data_bits = 3;
 942         }
 943         spin_lock_irqsave(&priv->lock, flags);
 944         oldlines = priv->line_control;
 945         if ((cflag & CBAUD) == B0) {
 946                 /* drop dtr and rts */
 947                 dev_dbg(dev, "%s - dropping the lines, baud rate 0bps\n", __func__);
 948                 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
 949         } else
 950                 priv->line_control = (CONTROL_DTR | CONTROL_RTS);
 951         spin_unlock_irqrestore(&priv->lock, flags);
 952
 953         dev_dbg(dev, "%s - sending %d stop_bits, %d parity_enable, %d parity_type, %d data_bits (+5)\n",
 954                 __func__, stop_bits, parity_enable, parity_type, data_bits);
 955
 956         cypress_serial_control(tty, port, tty_get_baud_rate(tty),
 957                         data_bits, stop_bits,
 958                         parity_enable, parity_type,
 959                         0, CYPRESS_SET_CONFIG);
 960
 961         /* we perform a CYPRESS_GET_CONFIG so that the current settings are
 962          * filled into the private structure this should confirm that all is
 963          * working if it returns what we just set */
 964         cypress_serial_control(tty, port, 0, 0, 0, 0, 0, 0, CYPRESS_GET_CONFIG);
 965
 966         /* Here we can define custom tty settings for devices; the main tty
 967          * termios flag base comes from empeg.c */
 968
 969         spin_lock_irqsave(&priv->lock, flags);
 970         if (priv->chiptype == CT_EARTHMATE && priv->baud_rate == 4800) {
 971                 dev_dbg(dev, "Using custom termios settings for a baud rate of 4800bps.\n");
 972                 /* define custom termios settings for NMEA protocol */
 973
 974                 tty->termios.c_iflag /* input modes - */
 975                         &= ~(IGNBRK  /* disable ignore break */
 976                         | BRKINT     /* disable break causes interrupt */
 977                         | PARMRK     /* disable mark parity errors */
 978                         | ISTRIP     /* disable clear high bit of input char */
 979                         | INLCR      /* disable translate NL to CR */
 980                         | IGNCR      /* disable ignore CR */
 981                         | ICRNL      /* disable translate CR to NL */
 982                         | IXON);     /* disable enable XON/XOFF flow control */
 983
 984                 tty->termios.c_oflag /* output modes */
 985                         &= ~OPOST;    /* disable postprocess output char */
 986
 987                 tty->termios.c_lflag /* line discipline modes */
 988                         &= ~(ECHO     /* disable echo input characters */
 989                         | ECHONL      /* disable echo new line */
 990                         | ICANON      /* disable erase, kill, werase, and rprnt
 991                                          special characters */
 992                         | ISIG        /* disable interrupt, quit, and suspend
 993                                          special characters */
 994                         | IEXTEN);    /* disable non-POSIX special characters */
 995         } /* CT_CYPHIDCOM: Application should handle this for device */
 996
 997         linechange = (priv->line_control != oldlines);
 998         spin_unlock_irqrestore(&priv->lock, flags);
 999
1000         /* if necessary, set lines */
1001         if (linechange) {
1002                 priv->cmd_ctrl = 1;
1003                 cypress_write(tty, port, NULL, 0);
1004         }
1005 } /* cypress_set_termios */
1006
1007
1008 /* returns amount of data still left in soft buffer */
1009 static int cypress_chars_in_buffer(struct tty_struct *tty)
1010 {
1011         struct usb_serial_port *port = tty->driver_data;
1012         struct cypress_private *priv = usb_get_serial_port_data(port);
1013         int chars = 0;
1014         unsigned long flags;
1015
1016         spin_lock_irqsave(&priv->lock, flags);
1017         chars = kfifo_len(&priv->write_fifo);
1018         spin_unlock_irqrestore(&priv->lock, flags);
1019
1020         dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
1021         return chars;
1022 }
1023
1024
1025 static void cypress_throttle(struct tty_struct *tty)
1026 {
1027         struct usb_serial_port *port = tty->driver_data;
1028         struct cypress_private *priv = usb_get_serial_port_data(port);
1029
1030         spin_lock_irq(&priv->lock);
1031         priv->rx_flags = THROTTLED;
1032         spin_unlock_irq(&priv->lock);
1033 }
1034
1035
1036 static void cypress_unthrottle(struct tty_struct *tty)
1037 {
1038         struct usb_serial_port *port = tty->driver_data;
1039         struct cypress_private *priv = usb_get_serial_port_data(port);
1040         int actually_throttled, result;
1041
1042         spin_lock_irq(&priv->lock);
1043         actually_throttled = priv->rx_flags & ACTUALLY_THROTTLED;
1044         priv->rx_flags = 0;
1045         spin_unlock_irq(&priv->lock);
1046
1047         if (!priv->comm_is_ok)
1048                 return;
1049
1050         if (actually_throttled) {
1051                 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
1052                 if (result) {
1053                         dev_err(&port->dev, "%s - failed submitting read urb, "
1054                                         "error %d\n", __func__, result);
1055                         cypress_set_dead(port);
1056                 }
1057         }
1058 }
1059
1060
1061 static void cypress_read_int_callback(struct urb *urb)
1062 {
1063         struct usb_serial_port *port = urb->context;
1064         struct cypress_private *priv = usb_get_serial_port_data(port);
1065         struct device *dev = &urb->dev->dev;
1066         struct tty_struct *tty;
1067         unsigned char *data = urb->transfer_buffer;
1068         unsigned long flags;
1069         char tty_flag = TTY_NORMAL;
1070         int bytes = 0;
1071         int result;
1072         int i = 0;
1073         int status = urb->status;
1074
1075         switch (status) {
1076         case 0: /* success */
1077                 break;
1078         case -ECONNRESET:
1079         case -ENOENT:
1080         case -ESHUTDOWN:
1081                 /* precursor to disconnect so just go away */
1082                 return;
1083         case -EPIPE:
1084                 /* Can't call usb_clear_halt while in_interrupt */
1085                 /* FALLS THROUGH */
1086         default:
1087                 /* something ugly is going on... */
1088                 dev_err(dev, "%s - unexpected nonzero read status received: %d\n",
1089                         __func__, status);
1090                 cypress_set_dead(port);
1091                 return;
1092         }
1093
1094         spin_lock_irqsave(&priv->lock, flags);
1095         if (priv->rx_flags & THROTTLED) {
1096                 dev_dbg(dev, "%s - now throttling\n", __func__);
1097                 priv->rx_flags |= ACTUALLY_THROTTLED;
1098                 spin_unlock_irqrestore(&priv->lock, flags);
1099                 return;
1100         }
1101         spin_unlock_irqrestore(&priv->lock, flags);
1102
1103         tty = tty_port_tty_get(&port->port);
1104         if (!tty) {
1105                 dev_dbg(dev, "%s - bad tty pointer - exiting\n", __func__);
1106                 return;
1107         }
1108
1109         spin_lock_irqsave(&priv->lock, flags);
1110         result = urb->actual_length;
1111         switch (priv->pkt_fmt) {
1112         default:
1113         case packet_format_1:
1114                 /* This is for the CY7C64013... */
1115                 priv->current_status = data[0] & 0xF8;
1116                 bytes = data[1] + 2;
1117                 i = 2;
1118                 break;
1119         case packet_format_2:
1120                 /* This is for the CY7C63743... */
1121                 priv->current_status = data[0] & 0xF8;
1122                 bytes = (data[0] & 0x07) + 1;
1123                 i = 1;
1124                 break;
1125         }
1126         spin_unlock_irqrestore(&priv->lock, flags);
1127         if (result < bytes) {
1128                 dev_dbg(dev,
1129                         "%s - wrong packet size - received %d bytes but packet said %d bytes\n",
1130                         __func__, result, bytes);
1131                 goto continue_read;
1132         }
1133
1134         usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
1135
1136         spin_lock_irqsave(&priv->lock, flags);
1137         /* check to see if status has changed */
1138         if (priv->current_status != priv->prev_status) {
1139                 u8 delta = priv->current_status ^ priv->prev_status;
1140
1141                 if (delta & UART_MSR_MASK) {
1142                         if (delta & UART_CTS)
1143                                 port->icount.cts++;
1144                         if (delta & UART_DSR)
1145                                 port->icount.dsr++;
1146                         if (delta & UART_RI)
1147                                 port->icount.rng++;
1148                         if (delta & UART_CD)
1149                                 port->icount.dcd++;
1150
1151                         wake_up_interruptible(&port->port.delta_msr_wait);
1152                 }
1153
1154                 priv->prev_status = priv->current_status;
1155         }
1156         spin_unlock_irqrestore(&priv->lock, flags);
1157
1158         /* hangup, as defined in acm.c... this might be a bad place for it
1159          * though */
1160         if (tty && !C_CLOCAL(tty) && !(priv->current_status & UART_CD)) {
1161                 dev_dbg(dev, "%s - calling hangup\n", __func__);
1162                 tty_hangup(tty);
1163                 goto continue_read;
1164         }
1165
1166         /* There is one error bit... I'm assuming it is a parity error
1167          * indicator as the generic firmware will set this bit to 1 if a
1168          * parity error occurs.
1169          * I can not find reference to any other error events. */
1170         spin_lock_irqsave(&priv->lock, flags);
1171         if (priv->current_status & CYP_ERROR) {
1172                 spin_unlock_irqrestore(&priv->lock, flags);
1173                 tty_flag = TTY_PARITY;
1174                 dev_dbg(dev, "%s - Parity Error detected\n", __func__);
1175         } else
1176                 spin_unlock_irqrestore(&priv->lock, flags);
1177
1178         /* process read if there is data other than line status */
1179         if (bytes > i) {
1180                 tty_insert_flip_string_fixed_flag(&port->port, data + i,
1181                                 tty_flag, bytes - i);
1182                 tty_flip_buffer_push(&port->port);
1183         }
1184
1185         spin_lock_irqsave(&priv->lock, flags);
1186         /* control and status byte(s) are also counted */
1187         priv->bytes_in += bytes;
1188         spin_unlock_irqrestore(&priv->lock, flags);
1189
1190 continue_read:
1191         tty_kref_put(tty);
1192
1193         /* Continue trying to always read */
1194
1195         if (priv->comm_is_ok) {
1196                 usb_fill_int_urb(port->interrupt_in_urb, port->serial->dev,
1197                                 usb_rcvintpipe(port->serial->dev,
1198                                         port->interrupt_in_endpointAddress),
1199                                 port->interrupt_in_urb->transfer_buffer,
1200                                 port->interrupt_in_urb->transfer_buffer_length,
1201                                 cypress_read_int_callback, port,
1202                                 priv->read_urb_interval);
1203                 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
1204                 if (result && result != -EPERM) {
1205                         dev_err(dev, "%s - failed resubmitting read urb, error %d\n",
1206                                 __func__, result);
1207                         cypress_set_dead(port);
1208                 }
1209         }
1210 } /* cypress_read_int_callback */
1211
1212
1213 static void cypress_write_int_callback(struct urb *urb)
1214 {
1215         struct usb_serial_port *port = urb->context;
1216         struct cypress_private *priv = usb_get_serial_port_data(port);
1217         struct device *dev = &urb->dev->dev;
1218         int status = urb->status;
1219
1220         switch (status) {
1221         case 0:
1222                 /* success */
1223                 break;
1224         case -ECONNRESET:
1225         case -ENOENT:
1226         case -ESHUTDOWN:
1227                 /* this urb is terminated, clean up */
1228                 dev_dbg(dev, "%s - urb shutting down with status: %d\n",
1229                         __func__, status);
1230                 priv->write_urb_in_use = 0;
1231                 return;
1232         case -EPIPE:
1233                 /* Cannot call usb_clear_halt while in_interrupt */
1234                 /* FALLTHROUGH */
1235         default:
1236                 dev_err(dev, "%s - unexpected nonzero write status received: %d\n",
1237                         __func__, status);
1238                 cypress_set_dead(port);
1239                 break;
1240         }
1241         priv->write_urb_in_use = 0;
1242
1243         /* send any buffered data */
1244         cypress_send(port);
1245 }
1246
1247 module_usb_serial_driver(serial_drivers, id_table_combined);
1248
1249 MODULE_AUTHOR(DRIVER_AUTHOR);
1250 MODULE_DESCRIPTION(DRIVER_DESC);
1251 MODULE_LICENSE("GPL");
1252
1253 module_param(stats, bool, S_IRUGO | S_IWUSR);
1254 MODULE_PARM_DESC(stats, "Enable statistics or not");
1255 module_param(interval, int, S_IRUGO | S_IWUSR);
1256 MODULE_PARM_DESC(interval, "Overrides interrupt interval");
1257 module_param(unstable_bauds, bool, S_IRUGO | S_IWUSR);
1258 MODULE_PARM_DESC(unstable_bauds, "Allow unstable baud rates");