Version:  2.0.40 2.2.26 2.4.37 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18

Linux/drivers/usb/serial/cypress_m8.c

  1 /*
  2  * USB Cypress M8 driver
  3  *
  4  *      Copyright (C) 2004
  5  *          Lonnie Mendez (dignome@gmail.com)
  6  *      Copyright (C) 2003,2004
  7  *          Neil Whelchel (koyama@firstlight.net)
  8  *
  9  *      This program is free software; you can redistribute it and/or modify
 10  *      it under the terms of the GNU General Public License as published by
 11  *      the Free Software Foundation; either version 2 of the License, or
 12  *      (at your option) any later version.
 13  *
 14  * See Documentation/usb/usb-serial.txt for more information on using this
 15  * driver
 16  *
 17  * See http://geocities.com/i0xox0i for information on this driver and the
 18  * earthmate usb device.
 19  */
 20 
 21 /* Thanks to Neil Whelchel for writing the first cypress m8 implementation
 22    for linux. */
 23 /* Thanks to cypress for providing references for the hid reports. */
 24 /* Thanks to Jiang Zhang for providing links and for general help. */
 25 /* Code originates and was built up from ftdi_sio, belkin, pl2303 and others.*/
 26 
 27 
 28 #include <linux/kernel.h>
 29 #include <linux/errno.h>
 30 #include <linux/slab.h>
 31 #include <linux/tty.h>
 32 #include <linux/tty_driver.h>
 33 #include <linux/tty_flip.h>
 34 #include <linux/module.h>
 35 #include <linux/moduleparam.h>
 36 #include <linux/spinlock.h>
 37 #include <linux/usb.h>
 38 #include <linux/usb/serial.h>
 39 #include <linux/serial.h>
 40 #include <linux/kfifo.h>
 41 #include <linux/delay.h>
 42 #include <linux/uaccess.h>
 43 #include <asm/unaligned.h>
 44 
 45 #include "cypress_m8.h"
 46 
 47 
 48 static bool stats;
 49 static int interval;
 50 static bool unstable_bauds;
 51 
 52 #define DRIVER_AUTHOR "Lonnie Mendez <dignome@gmail.com>, Neil Whelchel <koyama@firstlight.net>"
 53 #define DRIVER_DESC "Cypress USB to Serial Driver"
 54 
 55 /* write buffer size defines */
 56 #define CYPRESS_BUF_SIZE        1024
 57 
 58 static const struct usb_device_id id_table_earthmate[] = {
 59         { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
 60         { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
 61         { }                                             /* Terminating entry */
 62 };
 63 
 64 static const struct usb_device_id id_table_cyphidcomrs232[] = {
 65         { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
 66         { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) },
 67         { USB_DEVICE(VENDOR_ID_FRWD, PRODUCT_ID_CYPHIDCOM_FRWD) },
 68         { }                                             /* Terminating entry */
 69 };
 70 
 71 static const struct usb_device_id id_table_nokiaca42v2[] = {
 72         { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
 73         { }                                             /* Terminating entry */
 74 };
 75 
 76 static const struct usb_device_id id_table_combined[] = {
 77         { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
 78         { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
 79         { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
 80         { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) },
 81         { USB_DEVICE(VENDOR_ID_FRWD, PRODUCT_ID_CYPHIDCOM_FRWD) },
 82         { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
 83         { }                                             /* Terminating entry */
 84 };
 85 
 86 MODULE_DEVICE_TABLE(usb, id_table_combined);
 87 
 88 enum packet_format {
 89         packet_format_1,  /* b0:status, b1:payload count */
 90         packet_format_2   /* b0[7:3]:status, b0[2:0]:payload count */
 91 };
 92 
 93 struct cypress_private {
 94         spinlock_t lock;                   /* private lock */
 95         int chiptype;                      /* identifier of device, for quirks/etc */
 96         int bytes_in;                      /* used for statistics */
 97         int bytes_out;                     /* used for statistics */
 98         int cmd_count;                     /* used for statistics */
 99         int cmd_ctrl;                      /* always set this to 1 before issuing a command */
100         struct kfifo write_fifo;           /* write fifo */
101         int write_urb_in_use;              /* write urb in use indicator */
102         int write_urb_interval;            /* interval to use for write urb */
103         int read_urb_interval;             /* interval to use for read urb */
104         int comm_is_ok;                    /* true if communication is (still) ok */
105         int termios_initialized;
106         __u8 line_control;                 /* holds dtr / rts value */
107         __u8 current_status;               /* received from last read - info on dsr,cts,cd,ri,etc */
108         __u8 current_config;               /* stores the current configuration byte */
109         __u8 rx_flags;                     /* throttling - used from whiteheat/ftdi_sio */
110         enum packet_format pkt_fmt;        /* format to use for packet send / receive */
111         int get_cfg_unsafe;                /* If true, the CYPRESS_GET_CONFIG is unsafe */
112         int baud_rate;                     /* stores current baud rate in
113                                               integer form */
114         int isthrottled;                   /* if throttled, discard reads */
115         char prev_status;                  /* used for TIOCMIWAIT */
116         /* we pass a pointer to this as the argument sent to
117            cypress_set_termios old_termios */
118         struct ktermios tmp_termios;       /* stores the old termios settings */
119 };
120 
121 /* function prototypes for the Cypress USB to serial device */
122 static int  cypress_earthmate_port_probe(struct usb_serial_port *port);
123 static int  cypress_hidcom_port_probe(struct usb_serial_port *port);
124 static int  cypress_ca42v2_port_probe(struct usb_serial_port *port);
125 static int  cypress_port_remove(struct usb_serial_port *port);
126 static int  cypress_open(struct tty_struct *tty, struct usb_serial_port *port);
127 static void cypress_close(struct usb_serial_port *port);
128 static void cypress_dtr_rts(struct usb_serial_port *port, int on);
129 static int  cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
130                         const unsigned char *buf, int count);
131 static void cypress_send(struct usb_serial_port *port);
132 static int  cypress_write_room(struct tty_struct *tty);
133 static void cypress_set_termios(struct tty_struct *tty,
134                         struct usb_serial_port *port, struct ktermios *old);
135 static int  cypress_tiocmget(struct tty_struct *tty);
136 static int  cypress_tiocmset(struct tty_struct *tty,
137                         unsigned int set, unsigned int clear);
138 static int  cypress_chars_in_buffer(struct tty_struct *tty);
139 static void cypress_throttle(struct tty_struct *tty);
140 static void cypress_unthrottle(struct tty_struct *tty);
141 static void cypress_set_dead(struct usb_serial_port *port);
142 static void cypress_read_int_callback(struct urb *urb);
143 static void cypress_write_int_callback(struct urb *urb);
144 
145 static struct usb_serial_driver cypress_earthmate_device = {
146         .driver = {
147                 .owner =                THIS_MODULE,
148                 .name =                 "earthmate",
149         },
150         .description =                  "DeLorme Earthmate USB",
151         .id_table =                     id_table_earthmate,
152         .num_ports =                    1,
153         .port_probe =                   cypress_earthmate_port_probe,
154         .port_remove =                  cypress_port_remove,
155         .open =                         cypress_open,
156         .close =                        cypress_close,
157         .dtr_rts =                      cypress_dtr_rts,
158         .write =                        cypress_write,
159         .write_room =                   cypress_write_room,
160         .set_termios =                  cypress_set_termios,
161         .tiocmget =                     cypress_tiocmget,
162         .tiocmset =                     cypress_tiocmset,
163         .tiocmiwait =                   usb_serial_generic_tiocmiwait,
164         .chars_in_buffer =              cypress_chars_in_buffer,
165         .throttle =                     cypress_throttle,
166         .unthrottle =                   cypress_unthrottle,
167         .read_int_callback =            cypress_read_int_callback,
168         .write_int_callback =           cypress_write_int_callback,
169 };
170 
171 static struct usb_serial_driver cypress_hidcom_device = {
172         .driver = {
173                 .owner =                THIS_MODULE,
174                 .name =                 "cyphidcom",
175         },
176         .description =                  "HID->COM RS232 Adapter",
177         .id_table =                     id_table_cyphidcomrs232,
178         .num_ports =                    1,
179         .port_probe =                   cypress_hidcom_port_probe,
180         .port_remove =                  cypress_port_remove,
181         .open =                         cypress_open,
182         .close =                        cypress_close,
183         .dtr_rts =                      cypress_dtr_rts,
184         .write =                        cypress_write,
185         .write_room =                   cypress_write_room,
186         .set_termios =                  cypress_set_termios,
187         .tiocmget =                     cypress_tiocmget,
188         .tiocmset =                     cypress_tiocmset,
189         .tiocmiwait =                   usb_serial_generic_tiocmiwait,
190         .chars_in_buffer =              cypress_chars_in_buffer,
191         .throttle =                     cypress_throttle,
192         .unthrottle =                   cypress_unthrottle,
193         .read_int_callback =            cypress_read_int_callback,
194         .write_int_callback =           cypress_write_int_callback,
195 };
196 
197 static struct usb_serial_driver cypress_ca42v2_device = {
198         .driver = {
199                 .owner =                THIS_MODULE,
200                 .name =                 "nokiaca42v2",
201         },
202         .description =                  "Nokia CA-42 V2 Adapter",
203         .id_table =                     id_table_nokiaca42v2,
204         .num_ports =                    1,
205         .port_probe =                   cypress_ca42v2_port_probe,
206         .port_remove =                  cypress_port_remove,
207         .open =                         cypress_open,
208         .close =                        cypress_close,
209         .dtr_rts =                      cypress_dtr_rts,
210         .write =                        cypress_write,
211         .write_room =                   cypress_write_room,
212         .set_termios =                  cypress_set_termios,
213         .tiocmget =                     cypress_tiocmget,
214         .tiocmset =                     cypress_tiocmset,
215         .tiocmiwait =                   usb_serial_generic_tiocmiwait,
216         .chars_in_buffer =              cypress_chars_in_buffer,
217         .throttle =                     cypress_throttle,
218         .unthrottle =                   cypress_unthrottle,
219         .read_int_callback =            cypress_read_int_callback,
220         .write_int_callback =           cypress_write_int_callback,
221 };
222 
223 static struct usb_serial_driver * const serial_drivers[] = {
224         &cypress_earthmate_device, &cypress_hidcom_device,
225         &cypress_ca42v2_device, NULL
226 };
227 
228 /*****************************************************************************
229  * Cypress serial helper functions
230  *****************************************************************************/
231 
232 /* FRWD Dongle hidcom needs to skip reset and speed checks */
233 static inline bool is_frwd(struct usb_device *dev)
234 {
235         return ((le16_to_cpu(dev->descriptor.idVendor) == VENDOR_ID_FRWD) &&
236                 (le16_to_cpu(dev->descriptor.idProduct) == PRODUCT_ID_CYPHIDCOM_FRWD));
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         /* FRWD Dongle uses 115200 bps */
248         if (is_frwd(port->serial->dev))
249                 return new_rate;
250 
251         /*
252          * The general purpose firmware for the Cypress M8 allows for
253          * a maximum speed of 57600bps (I have no idea whether DeLorme
254          * chose to use the general purpose firmware or not), if you
255          * need to modify this speed setting for your own project
256          * please add your own chiptype and modify the code likewise.
257          * The Cypress HID->COM device will work successfully up to
258          * 115200bps (but the actual throughput is around 3kBps).
259          */
260         if (port->serial->dev->speed == USB_SPEED_LOW) {
261                 /*
262                  * Mike Isely <isely@pobox.com> 2-Feb-2008: The
263                  * Cypress app note that describes this mechanism
264                  * states the the low-speed part can't handle more
265                  * than 800 bytes/sec, in which case 4800 baud is the
266                  * safest speed for a part like that.
267                  */
268                 if (new_rate > 4800) {
269                         dev_dbg(&port->dev,
270                                 "%s - failed setting baud rate, device incapable speed %d\n",
271                                 __func__, new_rate);
272                         return -1;
273                 }
274         }
275         switch (priv->chiptype) {
276         case CT_EARTHMATE:
277                 if (new_rate <= 600) {
278                         /* 300 and 600 baud rates are supported under
279                          * the generic firmware, but are not used with
280                          * NMEA and SiRF protocols */
281                         dev_dbg(&port->dev,
282                                 "%s - failed setting baud rate, unsupported speed of %d on Earthmate GPS\n",
283                                 __func__, new_rate);
284                         return -1;
285                 }
286                 break;
287         default:
288                 break;
289         }
290         return new_rate;
291 }
292 
293 
294 /* This function can either set or retrieve the current serial line settings */
295 static int cypress_serial_control(struct tty_struct *tty,
296         struct usb_serial_port *port, speed_t baud_rate, int data_bits,
297         int stop_bits, int parity_enable, int parity_type, int reset,
298         int cypress_request_type)
299 {
300         int new_baudrate = 0, retval = 0, tries = 0;
301         struct cypress_private *priv;
302         struct device *dev = &port->dev;
303         u8 *feature_buffer;
304         const unsigned int feature_len = 5;
305         unsigned long flags;
306 
307         priv = usb_get_serial_port_data(port);
308 
309         if (!priv->comm_is_ok)
310                 return -ENODEV;
311 
312         feature_buffer = kcalloc(feature_len, sizeof(u8), GFP_KERNEL);
313         if (!feature_buffer)
314                 return -ENOMEM;
315 
316         switch (cypress_request_type) {
317         case CYPRESS_SET_CONFIG:
318                 /* 0 means 'Hang up' so doesn't change the true bit rate */
319                 new_baudrate = priv->baud_rate;
320                 if (baud_rate && baud_rate != priv->baud_rate) {
321                         dev_dbg(dev, "%s - baud rate is changing\n", __func__);
322                         retval = analyze_baud_rate(port, baud_rate);
323                         if (retval >= 0) {
324                                 new_baudrate = retval;
325                                 dev_dbg(dev, "%s - New baud rate set to %d\n",
326                                         __func__, new_baudrate);
327                         }
328                 }
329                 dev_dbg(dev, "%s - baud rate is being sent as %d\n", __func__,
330                         new_baudrate);
331 
332                 /* fill the feature_buffer with new configuration */
333                 put_unaligned_le32(new_baudrate, feature_buffer);
334                 feature_buffer[4] |= data_bits;   /* assign data bits in 2 bit space ( max 3 ) */
335                 /* 1 bit gap */
336                 feature_buffer[4] |= (stop_bits << 3);   /* assign stop bits in 1 bit space */
337                 feature_buffer[4] |= (parity_enable << 4);   /* assign parity flag in 1 bit space */
338                 feature_buffer[4] |= (parity_type << 5);   /* assign parity type in 1 bit space */
339                 /* 1 bit gap */
340                 feature_buffer[4] |= (reset << 7);   /* assign reset at end of byte, 1 bit space */
341 
342                 dev_dbg(dev, "%s - device is being sent this feature report:\n", __func__);
343                 dev_dbg(dev, "%s - %02X - %02X - %02X - %02X - %02X\n", __func__,
344                         feature_buffer[0], feature_buffer[1],
345                         feature_buffer[2], feature_buffer[3],
346                         feature_buffer[4]);
347 
348                 do {
349                         retval = usb_control_msg(port->serial->dev,
350                                         usb_sndctrlpipe(port->serial->dev, 0),
351                                         HID_REQ_SET_REPORT,
352                                         USB_DIR_OUT | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
353                                         0x0300, 0, feature_buffer,
354                                         feature_len, 500);
355 
356                         if (tries++ >= 3)
357                                 break;
358 
359                 } while (retval != feature_len &&
360                          retval != -ENODEV);
361 
362                 if (retval != feature_len) {
363                         dev_err(dev, "%s - failed sending serial line settings - %d\n",
364                                 __func__, retval);
365                         cypress_set_dead(port);
366                 } else {
367                         spin_lock_irqsave(&priv->lock, flags);
368                         priv->baud_rate = new_baudrate;
369                         priv->current_config = feature_buffer[4];
370                         spin_unlock_irqrestore(&priv->lock, flags);
371                         /* If we asked for a speed change encode it */
372                         if (baud_rate)
373                                 tty_encode_baud_rate(tty,
374                                         new_baudrate, new_baudrate);
375                 }
376         break;
377         case CYPRESS_GET_CONFIG:
378                 if (priv->get_cfg_unsafe) {
379                         /* Not implemented for this device,
380                            and if we try to do it we're likely
381                            to crash the hardware. */
382                         retval = -ENOTTY;
383                         goto out;
384                 }
385                 dev_dbg(dev, "%s - retreiving serial line settings\n", __func__);
386                 do {
387                         retval = usb_control_msg(port->serial->dev,
388                                         usb_rcvctrlpipe(port->serial->dev, 0),
389                                         HID_REQ_GET_REPORT,
390                                         USB_DIR_IN | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
391                                         0x0300, 0, feature_buffer,
392                                         feature_len, 500);
393 
394                         if (tries++ >= 3)
395                                 break;
396                 } while (retval != feature_len
397                                                 && retval != -ENODEV);
398 
399                 if (retval != feature_len) {
400                         dev_err(dev, "%s - failed to retrieve serial line settings - %d\n",
401                                 __func__, retval);
402                         cypress_set_dead(port);
403                         goto out;
404                 } else {
405                         spin_lock_irqsave(&priv->lock, flags);
406                         /* store the config in one byte, and later
407                            use bit masks to check values */
408                         priv->current_config = feature_buffer[4];
409                         priv->baud_rate = get_unaligned_le32(feature_buffer);
410                         spin_unlock_irqrestore(&priv->lock, flags);
411                 }
412         }
413         spin_lock_irqsave(&priv->lock, flags);
414         ++priv->cmd_count;
415         spin_unlock_irqrestore(&priv->lock, flags);
416 out:
417         kfree(feature_buffer);
418         return retval;
419 } /* cypress_serial_control */
420 
421 
422 static void cypress_set_dead(struct usb_serial_port *port)
423 {
424         struct cypress_private *priv = usb_get_serial_port_data(port);
425         unsigned long flags;
426 
427         spin_lock_irqsave(&priv->lock, flags);
428         if (!priv->comm_is_ok) {
429                 spin_unlock_irqrestore(&priv->lock, flags);
430                 return;
431         }
432         priv->comm_is_ok = 0;
433         spin_unlock_irqrestore(&priv->lock, flags);
434 
435         dev_err(&port->dev, "cypress_m8 suspending failing port %d - "
436                 "interval might be too short\n", port->port_number);
437 }
438 
439 
440 /*****************************************************************************
441  * Cypress serial driver functions
442  *****************************************************************************/
443 
444 
445 static int cypress_generic_port_probe(struct usb_serial_port *port)
446 {
447         struct usb_serial *serial = port->serial;
448         struct cypress_private *priv;
449 
450         priv = kzalloc(sizeof(struct cypress_private), GFP_KERNEL);
451         if (!priv)
452                 return -ENOMEM;
453 
454         priv->comm_is_ok = !0;
455         spin_lock_init(&priv->lock);
456         if (kfifo_alloc(&priv->write_fifo, CYPRESS_BUF_SIZE, GFP_KERNEL)) {
457                 kfree(priv);
458                 return -ENOMEM;
459         }
460 
461         /* Skip reset for FRWD device. It is a workaound:
462            device hangs if it receives SET_CONFIGURE in Configured
463            state. */
464         if (!is_frwd(serial->dev))
465                 usb_reset_configuration(serial->dev);
466 
467         priv->cmd_ctrl = 0;
468         priv->line_control = 0;
469         priv->termios_initialized = 0;
470         priv->rx_flags = 0;
471         /* Default packet format setting is determined by packet size.
472            Anything with a size larger then 9 must have a separate
473            count field since the 3 bit count field is otherwise too
474            small.  Otherwise we can use the slightly more compact
475            format.  This is in accordance with the cypress_m8 serial
476            converter app note. */
477         if (port->interrupt_out_size > 9)
478                 priv->pkt_fmt = packet_format_1;
479         else
480                 priv->pkt_fmt = packet_format_2;
481 
482         if (interval > 0) {
483                 priv->write_urb_interval = interval;
484                 priv->read_urb_interval = interval;
485                 dev_dbg(&port->dev, "%s - read & write intervals forced to %d\n",
486                         __func__, interval);
487         } else {
488                 priv->write_urb_interval = port->interrupt_out_urb->interval;
489                 priv->read_urb_interval = port->interrupt_in_urb->interval;
490                 dev_dbg(&port->dev, "%s - intervals: read=%d write=%d\n",
491                         __func__, priv->read_urb_interval,
492                         priv->write_urb_interval);
493         }
494         usb_set_serial_port_data(port, priv);
495 
496         port->port.drain_delay = 256;
497 
498         return 0;
499 }
500 
501 
502 static int cypress_earthmate_port_probe(struct usb_serial_port *port)
503 {
504         struct usb_serial *serial = port->serial;
505         struct cypress_private *priv;
506         int ret;
507 
508         ret = cypress_generic_port_probe(port);
509         if (ret) {
510                 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
511                 return ret;
512         }
513 
514         priv = usb_get_serial_port_data(port);
515         priv->chiptype = CT_EARTHMATE;
516         /* All Earthmate devices use the separated-count packet
517            format!  Idiotic. */
518         priv->pkt_fmt = packet_format_1;
519         if (serial->dev->descriptor.idProduct !=
520                                 cpu_to_le16(PRODUCT_ID_EARTHMATEUSB)) {
521                 /* The old original USB Earthmate seemed able to
522                    handle GET_CONFIG requests; everything they've
523                    produced since that time crashes if this command is
524                    attempted :-( */
525                 dev_dbg(&port->dev,
526                         "%s - Marking this device as unsafe for GET_CONFIG commands\n",
527                         __func__);
528                 priv->get_cfg_unsafe = !0;
529         }
530 
531         return 0;
532 }
533 
534 static int cypress_hidcom_port_probe(struct usb_serial_port *port)
535 {
536         struct cypress_private *priv;
537         int ret;
538 
539         ret = cypress_generic_port_probe(port);
540         if (ret) {
541                 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
542                 return ret;
543         }
544 
545         priv = usb_get_serial_port_data(port);
546         priv->chiptype = CT_CYPHIDCOM;
547 
548         return 0;
549 }
550 
551 static int cypress_ca42v2_port_probe(struct usb_serial_port *port)
552 {
553         struct cypress_private *priv;
554         int ret;
555 
556         ret = cypress_generic_port_probe(port);
557         if (ret) {
558                 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
559                 return ret;
560         }
561 
562         priv = usb_get_serial_port_data(port);
563         priv->chiptype = CT_CA42V2;
564 
565         return 0;
566 }
567 
568 static int cypress_port_remove(struct usb_serial_port *port)
569 {
570         struct cypress_private *priv;
571 
572         priv = usb_get_serial_port_data(port);
573 
574         kfifo_free(&priv->write_fifo);
575         kfree(priv);
576 
577         return 0;
578 }
579 
580 static int cypress_open(struct tty_struct *tty, struct usb_serial_port *port)
581 {
582         struct cypress_private *priv = usb_get_serial_port_data(port);
583         struct usb_serial *serial = port->serial;
584         unsigned long flags;
585         int result = 0;
586 
587         if (!priv->comm_is_ok)
588                 return -EIO;
589 
590         /* clear halts before open */
591         usb_clear_halt(serial->dev, 0x81);
592         usb_clear_halt(serial->dev, 0x02);
593 
594         spin_lock_irqsave(&priv->lock, flags);
595         /* reset read/write statistics */
596         priv->bytes_in = 0;
597         priv->bytes_out = 0;
598         priv->cmd_count = 0;
599         priv->rx_flags = 0;
600         spin_unlock_irqrestore(&priv->lock, flags);
601 
602         /* Set termios */
603         cypress_send(port);
604 
605         if (tty)
606                 cypress_set_termios(tty, port, &priv->tmp_termios);
607 
608         /* setup the port and start reading from the device */
609         if (!port->interrupt_in_urb) {
610                 dev_err(&port->dev, "%s - interrupt_in_urb is empty!\n",
611                         __func__);
612                 return -1;
613         }
614 
615         usb_fill_int_urb(port->interrupt_in_urb, serial->dev,
616                 usb_rcvintpipe(serial->dev, port->interrupt_in_endpointAddress),
617                 port->interrupt_in_urb->transfer_buffer,
618                 port->interrupt_in_urb->transfer_buffer_length,
619                 cypress_read_int_callback, port, priv->read_urb_interval);
620         result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
621 
622         if (result) {
623                 dev_err(&port->dev,
624                         "%s - failed submitting read urb, error %d\n",
625                                                         __func__, result);
626                 cypress_set_dead(port);
627         }
628 
629         return result;
630 } /* cypress_open */
631 
632 static void cypress_dtr_rts(struct usb_serial_port *port, int on)
633 {
634         struct cypress_private *priv = usb_get_serial_port_data(port);
635         /* drop dtr and rts */
636         spin_lock_irq(&priv->lock);
637         if (on == 0)
638                 priv->line_control = 0;
639         else 
640                 priv->line_control = CONTROL_DTR | CONTROL_RTS;
641         priv->cmd_ctrl = 1;
642         spin_unlock_irq(&priv->lock);
643         cypress_write(NULL, port, NULL, 0);
644 }
645 
646 static void cypress_close(struct usb_serial_port *port)
647 {
648         struct cypress_private *priv = usb_get_serial_port_data(port);
649         unsigned long flags;
650 
651         spin_lock_irqsave(&priv->lock, flags);
652         kfifo_reset_out(&priv->write_fifo);
653         spin_unlock_irqrestore(&priv->lock, flags);
654 
655         dev_dbg(&port->dev, "%s - stopping urbs\n", __func__);
656         usb_kill_urb(port->interrupt_in_urb);
657         usb_kill_urb(port->interrupt_out_urb);
658 
659         if (stats)
660                 dev_info(&port->dev, "Statistics: %d Bytes In | %d Bytes Out | %d Commands Issued\n",
661                         priv->bytes_in, priv->bytes_out, priv->cmd_count);
662 } /* cypress_close */
663 
664 
665 static int cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
666                                         const unsigned char *buf, int count)
667 {
668         struct cypress_private *priv = usb_get_serial_port_data(port);
669 
670         dev_dbg(&port->dev, "%s - %d bytes\n", __func__, count);
671 
672         /* line control commands, which need to be executed immediately,
673            are not put into the buffer for obvious reasons.
674          */
675         if (priv->cmd_ctrl) {
676                 count = 0;
677                 goto finish;
678         }
679 
680         if (!count)
681                 return count;
682 
683         count = kfifo_in_locked(&priv->write_fifo, buf, count, &priv->lock);
684 
685 finish:
686         cypress_send(port);
687 
688         return count;
689 } /* cypress_write */
690 
691 
692 static void cypress_send(struct usb_serial_port *port)
693 {
694         int count = 0, result, offset, actual_size;
695         struct cypress_private *priv = usb_get_serial_port_data(port);
696         struct device *dev = &port->dev;
697         unsigned long flags;
698 
699         if (!priv->comm_is_ok)
700                 return;
701 
702         dev_dbg(dev, "%s - interrupt out size is %d\n", __func__,
703                 port->interrupt_out_size);
704 
705         spin_lock_irqsave(&priv->lock, flags);
706         if (priv->write_urb_in_use) {
707                 dev_dbg(dev, "%s - can't write, urb in use\n", __func__);
708                 spin_unlock_irqrestore(&priv->lock, flags);
709                 return;
710         }
711         spin_unlock_irqrestore(&priv->lock, flags);
712 
713         /* clear buffer */
714         memset(port->interrupt_out_urb->transfer_buffer, 0,
715                                                 port->interrupt_out_size);
716 
717         spin_lock_irqsave(&priv->lock, flags);
718         switch (priv->pkt_fmt) {
719         default:
720         case packet_format_1:
721                 /* this is for the CY7C64013... */
722                 offset = 2;
723                 port->interrupt_out_buffer[0] = priv->line_control;
724                 break;
725         case packet_format_2:
726                 /* this is for the CY7C63743... */
727                 offset = 1;
728                 port->interrupt_out_buffer[0] = priv->line_control;
729                 break;
730         }
731 
732         if (priv->line_control & CONTROL_RESET)
733                 priv->line_control &= ~CONTROL_RESET;
734 
735         if (priv->cmd_ctrl) {
736                 priv->cmd_count++;
737                 dev_dbg(dev, "%s - line control command being issued\n", __func__);
738                 spin_unlock_irqrestore(&priv->lock, flags);
739                 goto send;
740         } else
741                 spin_unlock_irqrestore(&priv->lock, flags);
742 
743         count = kfifo_out_locked(&priv->write_fifo,
744                                         &port->interrupt_out_buffer[offset],
745                                         port->interrupt_out_size - offset,
746                                         &priv->lock);
747         if (count == 0)
748                 return;
749 
750         switch (priv->pkt_fmt) {
751         default:
752         case packet_format_1:
753                 port->interrupt_out_buffer[1] = count;
754                 break;
755         case packet_format_2:
756                 port->interrupt_out_buffer[0] |= count;
757         }
758 
759         dev_dbg(dev, "%s - count is %d\n", __func__, count);
760 
761 send:
762         spin_lock_irqsave(&priv->lock, flags);
763         priv->write_urb_in_use = 1;
764         spin_unlock_irqrestore(&priv->lock, flags);
765 
766         if (priv->cmd_ctrl)
767                 actual_size = 1;
768         else
769                 actual_size = count +
770                               (priv->pkt_fmt == packet_format_1 ? 2 : 1);
771 
772         usb_serial_debug_data(dev, __func__, port->interrupt_out_size,
773                               port->interrupt_out_urb->transfer_buffer);
774 
775         usb_fill_int_urb(port->interrupt_out_urb, port->serial->dev,
776                 usb_sndintpipe(port->serial->dev, port->interrupt_out_endpointAddress),
777                 port->interrupt_out_buffer, port->interrupt_out_size,
778                 cypress_write_int_callback, port, priv->write_urb_interval);
779         result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC);
780         if (result) {
781                 dev_err_console(port,
782                                 "%s - failed submitting write urb, error %d\n",
783                                                         __func__, result);
784                 priv->write_urb_in_use = 0;
785                 cypress_set_dead(port);
786         }
787 
788         spin_lock_irqsave(&priv->lock, flags);
789         if (priv->cmd_ctrl)
790                 priv->cmd_ctrl = 0;
791 
792         /* do not count the line control and size bytes */
793         priv->bytes_out += count;
794         spin_unlock_irqrestore(&priv->lock, flags);
795 
796         usb_serial_port_softint(port);
797 } /* cypress_send */
798 
799 
800 /* returns how much space is available in the soft buffer */
801 static int cypress_write_room(struct tty_struct *tty)
802 {
803         struct usb_serial_port *port = tty->driver_data;
804         struct cypress_private *priv = usb_get_serial_port_data(port);
805         int room = 0;
806         unsigned long flags;
807 
808         spin_lock_irqsave(&priv->lock, flags);
809         room = kfifo_avail(&priv->write_fifo);
810         spin_unlock_irqrestore(&priv->lock, flags);
811 
812         dev_dbg(&port->dev, "%s - returns %d\n", __func__, room);
813         return room;
814 }
815 
816 
817 static int cypress_tiocmget(struct tty_struct *tty)
818 {
819         struct usb_serial_port *port = tty->driver_data;
820         struct cypress_private *priv = usb_get_serial_port_data(port);
821         __u8 status, control;
822         unsigned int result = 0;
823         unsigned long flags;
824 
825         spin_lock_irqsave(&priv->lock, flags);
826         control = priv->line_control;
827         status = priv->current_status;
828         spin_unlock_irqrestore(&priv->lock, flags);
829 
830         result = ((control & CONTROL_DTR)        ? TIOCM_DTR : 0)
831                 | ((control & CONTROL_RTS)       ? TIOCM_RTS : 0)
832                 | ((status & UART_CTS)        ? TIOCM_CTS : 0)
833                 | ((status & UART_DSR)        ? TIOCM_DSR : 0)
834                 | ((status & UART_RI)         ? TIOCM_RI  : 0)
835                 | ((status & UART_CD)         ? TIOCM_CD  : 0);
836 
837         dev_dbg(&port->dev, "%s - result = %x\n", __func__, result);
838 
839         return result;
840 }
841 
842 
843 static int cypress_tiocmset(struct tty_struct *tty,
844                                unsigned int set, unsigned int clear)
845 {
846         struct usb_serial_port *port = tty->driver_data;
847         struct cypress_private *priv = usb_get_serial_port_data(port);
848         unsigned long flags;
849 
850         spin_lock_irqsave(&priv->lock, flags);
851         if (set & TIOCM_RTS)
852                 priv->line_control |= CONTROL_RTS;
853         if (set & TIOCM_DTR)
854                 priv->line_control |= CONTROL_DTR;
855         if (clear & TIOCM_RTS)
856                 priv->line_control &= ~CONTROL_RTS;
857         if (clear & TIOCM_DTR)
858                 priv->line_control &= ~CONTROL_DTR;
859         priv->cmd_ctrl = 1;
860         spin_unlock_irqrestore(&priv->lock, flags);
861 
862         return cypress_write(tty, port, NULL, 0);
863 }
864 
865 static void cypress_set_termios(struct tty_struct *tty,
866         struct usb_serial_port *port, struct ktermios *old_termios)
867 {
868         struct cypress_private *priv = usb_get_serial_port_data(port);
869         struct device *dev = &port->dev;
870         int data_bits, stop_bits, parity_type, parity_enable;
871         unsigned cflag, iflag;
872         unsigned long flags;
873         __u8 oldlines;
874         int linechange = 0;
875 
876         spin_lock_irqsave(&priv->lock, flags);
877         /* We can't clean this one up as we don't know the device type
878            early enough */
879         if (!priv->termios_initialized) {
880                 if (priv->chiptype == CT_EARTHMATE) {
881                         tty->termios = tty_std_termios;
882                         tty->termios.c_cflag = B4800 | CS8 | CREAD | HUPCL |
883                                 CLOCAL;
884                         tty->termios.c_ispeed = 4800;
885                         tty->termios.c_ospeed = 4800;
886                 } else if (priv->chiptype == CT_CYPHIDCOM) {
887                         tty->termios = tty_std_termios;
888                         tty->termios.c_cflag = B9600 | CS8 | CREAD | HUPCL |
889                                 CLOCAL;
890                         tty->termios.c_ispeed = 9600;
891                         tty->termios.c_ospeed = 9600;
892                 } else if (priv->chiptype == CT_CA42V2) {
893                         tty->termios = tty_std_termios;
894                         tty->termios.c_cflag = B9600 | CS8 | CREAD | HUPCL |
895                                 CLOCAL;
896                         tty->termios.c_ispeed = 9600;
897                         tty->termios.c_ospeed = 9600;
898                 }
899                 priv->termios_initialized = 1;
900         }
901         spin_unlock_irqrestore(&priv->lock, flags);
902 
903         /* Unsupported features need clearing */
904         tty->termios.c_cflag &= ~(CMSPAR|CRTSCTS);
905 
906         cflag = tty->termios.c_cflag;
907         iflag = tty->termios.c_iflag;
908 
909         /* check if there are new settings */
910         if (old_termios) {
911                 spin_lock_irqsave(&priv->lock, flags);
912                 priv->tmp_termios = tty->termios;
913                 spin_unlock_irqrestore(&priv->lock, flags);
914         }
915 
916         /* set number of data bits, parity, stop bits */
917         /* when parity is disabled the parity type bit is ignored */
918 
919         /* 1 means 2 stop bits, 0 means 1 stop bit */
920         stop_bits = cflag & CSTOPB ? 1 : 0;
921 
922         if (cflag & PARENB) {
923                 parity_enable = 1;
924                 /* 1 means odd parity, 0 means even parity */
925                 parity_type = cflag & PARODD ? 1 : 0;
926         } else
927                 parity_enable = parity_type = 0;
928 
929         switch (cflag & CSIZE) {
930         case CS5:
931                 data_bits = 0;
932                 break;
933         case CS6:
934                 data_bits = 1;
935                 break;
936         case CS7:
937                 data_bits = 2;
938                 break;
939         case CS8:
940                 data_bits = 3;
941                 break;
942         default:
943                 dev_err(dev, "%s - CSIZE was set, but not CS5-CS8\n", __func__);
944                 data_bits = 3;
945         }
946         spin_lock_irqsave(&priv->lock, flags);
947         oldlines = priv->line_control;
948         if ((cflag & CBAUD) == B0) {
949                 /* drop dtr and rts */
950                 dev_dbg(dev, "%s - dropping the lines, baud rate 0bps\n", __func__);
951                 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
952         } else
953                 priv->line_control = (CONTROL_DTR | CONTROL_RTS);
954         spin_unlock_irqrestore(&priv->lock, flags);
955 
956         dev_dbg(dev, "%s - sending %d stop_bits, %d parity_enable, %d parity_type, %d data_bits (+5)\n",
957                 __func__, stop_bits, parity_enable, parity_type, data_bits);
958 
959         cypress_serial_control(tty, port, tty_get_baud_rate(tty),
960                         data_bits, stop_bits,
961                         parity_enable, parity_type,
962                         0, CYPRESS_SET_CONFIG);
963 
964         /* we perform a CYPRESS_GET_CONFIG so that the current settings are
965          * filled into the private structure this should confirm that all is
966          * working if it returns what we just set */
967         cypress_serial_control(tty, port, 0, 0, 0, 0, 0, 0, CYPRESS_GET_CONFIG);
968 
969         /* Here we can define custom tty settings for devices; the main tty
970          * termios flag base comes from empeg.c */
971 
972         spin_lock_irqsave(&priv->lock, flags);
973         if (priv->chiptype == CT_EARTHMATE && priv->baud_rate == 4800) {
974                 dev_dbg(dev, "Using custom termios settings for a baud rate of 4800bps.\n");
975                 /* define custom termios settings for NMEA protocol */
976 
977                 tty->termios.c_iflag /* input modes - */
978                         &= ~(IGNBRK  /* disable ignore break */
979                         | BRKINT     /* disable break causes interrupt */
980                         | PARMRK     /* disable mark parity errors */
981                         | ISTRIP     /* disable clear high bit of input char */
982                         | INLCR      /* disable translate NL to CR */
983                         | IGNCR      /* disable ignore CR */
984                         | ICRNL      /* disable translate CR to NL */
985                         | IXON);     /* disable enable XON/XOFF flow control */
986 
987                 tty->termios.c_oflag /* output modes */
988                         &= ~OPOST;    /* disable postprocess output char */
989 
990                 tty->termios.c_lflag /* line discipline modes */
991                         &= ~(ECHO     /* disable echo input characters */
992                         | ECHONL      /* disable echo new line */
993                         | ICANON      /* disable erase, kill, werase, and rprnt
994                                          special characters */
995                         | ISIG        /* disable interrupt, quit, and suspend
996                                          special characters */
997                         | IEXTEN);    /* disable non-POSIX special characters */
998         } /* CT_CYPHIDCOM: Application should handle this for device */
999 
1000         linechange = (priv->line_control != oldlines);
1001         spin_unlock_irqrestore(&priv->lock, flags);
1002 
1003         /* if necessary, set lines */
1004         if (linechange) {
1005                 priv->cmd_ctrl = 1;
1006                 cypress_write(tty, port, NULL, 0);
1007         }
1008 } /* cypress_set_termios */
1009 
1010 
1011 /* returns amount of data still left in soft buffer */
1012 static int cypress_chars_in_buffer(struct tty_struct *tty)
1013 {
1014         struct usb_serial_port *port = tty->driver_data;
1015         struct cypress_private *priv = usb_get_serial_port_data(port);
1016         int chars = 0;
1017         unsigned long flags;
1018 
1019         spin_lock_irqsave(&priv->lock, flags);
1020         chars = kfifo_len(&priv->write_fifo);
1021         spin_unlock_irqrestore(&priv->lock, flags);
1022 
1023         dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
1024         return chars;
1025 }
1026 
1027 
1028 static void cypress_throttle(struct tty_struct *tty)
1029 {
1030         struct usb_serial_port *port = tty->driver_data;
1031         struct cypress_private *priv = usb_get_serial_port_data(port);
1032 
1033         spin_lock_irq(&priv->lock);
1034         priv->rx_flags = THROTTLED;
1035         spin_unlock_irq(&priv->lock);
1036 }
1037 
1038 
1039 static void cypress_unthrottle(struct tty_struct *tty)
1040 {
1041         struct usb_serial_port *port = tty->driver_data;
1042         struct cypress_private *priv = usb_get_serial_port_data(port);
1043         int actually_throttled, result;
1044 
1045         spin_lock_irq(&priv->lock);
1046         actually_throttled = priv->rx_flags & ACTUALLY_THROTTLED;
1047         priv->rx_flags = 0;
1048         spin_unlock_irq(&priv->lock);
1049 
1050         if (!priv->comm_is_ok)
1051                 return;
1052 
1053         if (actually_throttled) {
1054                 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
1055                 if (result) {
1056                         dev_err(&port->dev, "%s - failed submitting read urb, "
1057                                         "error %d\n", __func__, result);
1058                         cypress_set_dead(port);
1059                 }
1060         }
1061 }
1062 
1063 
1064 static void cypress_read_int_callback(struct urb *urb)
1065 {
1066         struct usb_serial_port *port = urb->context;
1067         struct cypress_private *priv = usb_get_serial_port_data(port);
1068         struct device *dev = &urb->dev->dev;
1069         struct tty_struct *tty;
1070         unsigned char *data = urb->transfer_buffer;
1071         unsigned long flags;
1072         char tty_flag = TTY_NORMAL;
1073         int havedata = 0;
1074         int bytes = 0;
1075         int result;
1076         int i = 0;
1077         int status = urb->status;
1078 
1079         switch (status) {
1080         case 0: /* success */
1081                 break;
1082         case -ECONNRESET:
1083         case -ENOENT:
1084         case -ESHUTDOWN:
1085                 /* precursor to disconnect so just go away */
1086                 return;
1087         case -EPIPE:
1088                 /* Can't call usb_clear_halt while in_interrupt */
1089                 /* FALLS THROUGH */
1090         default:
1091                 /* something ugly is going on... */
1092                 dev_err(dev, "%s - unexpected nonzero read status received: %d\n",
1093                         __func__, status);
1094                 cypress_set_dead(port);
1095                 return;
1096         }
1097 
1098         spin_lock_irqsave(&priv->lock, flags);
1099         if (priv->rx_flags & THROTTLED) {
1100                 dev_dbg(dev, "%s - now throttling\n", __func__);
1101                 priv->rx_flags |= ACTUALLY_THROTTLED;
1102                 spin_unlock_irqrestore(&priv->lock, flags);
1103                 return;
1104         }
1105         spin_unlock_irqrestore(&priv->lock, flags);
1106 
1107         tty = tty_port_tty_get(&port->port);
1108         if (!tty) {
1109                 dev_dbg(dev, "%s - bad tty pointer - exiting\n", __func__);
1110                 return;
1111         }
1112 
1113         spin_lock_irqsave(&priv->lock, flags);
1114         result = urb->actual_length;
1115         switch (priv->pkt_fmt) {
1116         default:
1117         case packet_format_1:
1118                 /* This is for the CY7C64013... */
1119                 priv->current_status = data[0] & 0xF8;
1120                 bytes = data[1] + 2;
1121                 i = 2;
1122                 if (bytes > 2)
1123                         havedata = 1;
1124                 break;
1125         case packet_format_2:
1126                 /* This is for the CY7C63743... */
1127                 priv->current_status = data[0] & 0xF8;
1128                 bytes = (data[0] & 0x07) + 1;
1129                 i = 1;
1130                 if (bytes > 1)
1131                         havedata = 1;
1132                 break;
1133         }
1134         spin_unlock_irqrestore(&priv->lock, flags);
1135         if (result < bytes) {
1136                 dev_dbg(dev,
1137                         "%s - wrong packet size - received %d bytes but packet said %d bytes\n",
1138                         __func__, result, bytes);
1139                 goto continue_read;
1140         }
1141 
1142         usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
1143 
1144         spin_lock_irqsave(&priv->lock, flags);
1145         /* check to see if status has changed */
1146         if (priv->current_status != priv->prev_status) {
1147                 u8 delta = priv->current_status ^ priv->prev_status;
1148 
1149                 if (delta & UART_MSR_MASK) {
1150                         if (delta & UART_CTS)
1151                                 port->icount.cts++;
1152                         if (delta & UART_DSR)
1153                                 port->icount.dsr++;
1154                         if (delta & UART_RI)
1155                                 port->icount.rng++;
1156                         if (delta & UART_CD)
1157                                 port->icount.dcd++;
1158 
1159                         wake_up_interruptible(&port->port.delta_msr_wait);
1160                 }
1161 
1162                 priv->prev_status = priv->current_status;
1163         }
1164         spin_unlock_irqrestore(&priv->lock, flags);
1165 
1166         /* hangup, as defined in acm.c... this might be a bad place for it
1167          * though */
1168         if (tty && !(tty->termios.c_cflag & CLOCAL) &&
1169                         !(priv->current_status & UART_CD)) {
1170                 dev_dbg(dev, "%s - calling hangup\n", __func__);
1171                 tty_hangup(tty);
1172                 goto continue_read;
1173         }
1174 
1175         /* There is one error bit... I'm assuming it is a parity error
1176          * indicator as the generic firmware will set this bit to 1 if a
1177          * parity error occurs.
1178          * I can not find reference to any other error events. */
1179         spin_lock_irqsave(&priv->lock, flags);
1180         if (priv->current_status & CYP_ERROR) {
1181                 spin_unlock_irqrestore(&priv->lock, flags);
1182                 tty_flag = TTY_PARITY;
1183                 dev_dbg(dev, "%s - Parity Error detected\n", __func__);
1184         } else
1185                 spin_unlock_irqrestore(&priv->lock, flags);
1186 
1187         /* process read if there is data other than line status */
1188         if (bytes > i) {
1189                 tty_insert_flip_string_fixed_flag(&port->port, data + i,
1190                                 tty_flag, bytes - i);
1191                 tty_flip_buffer_push(&port->port);
1192         }
1193 
1194         spin_lock_irqsave(&priv->lock, flags);
1195         /* control and status byte(s) are also counted */
1196         priv->bytes_in += bytes;
1197         spin_unlock_irqrestore(&priv->lock, flags);
1198 
1199 continue_read:
1200         tty_kref_put(tty);
1201 
1202         /* Continue trying to always read */
1203 
1204         if (priv->comm_is_ok) {
1205                 usb_fill_int_urb(port->interrupt_in_urb, port->serial->dev,
1206                                 usb_rcvintpipe(port->serial->dev,
1207                                         port->interrupt_in_endpointAddress),
1208                                 port->interrupt_in_urb->transfer_buffer,
1209                                 port->interrupt_in_urb->transfer_buffer_length,
1210                                 cypress_read_int_callback, port,
1211                                 priv->read_urb_interval);
1212                 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
1213                 if (result && result != -EPERM) {
1214                         dev_err(dev, "%s - failed resubmitting read urb, error %d\n",
1215                                 __func__, result);
1216                         cypress_set_dead(port);
1217                 }
1218         }
1219 } /* cypress_read_int_callback */
1220 
1221 
1222 static void cypress_write_int_callback(struct urb *urb)
1223 {
1224         struct usb_serial_port *port = urb->context;
1225         struct cypress_private *priv = usb_get_serial_port_data(port);
1226         struct device *dev = &urb->dev->dev;
1227         int status = urb->status;
1228 
1229         switch (status) {
1230         case 0:
1231                 /* success */
1232                 break;
1233         case -ECONNRESET:
1234         case -ENOENT:
1235         case -ESHUTDOWN:
1236                 /* this urb is terminated, clean up */
1237                 dev_dbg(dev, "%s - urb shutting down with status: %d\n",
1238                         __func__, status);
1239                 priv->write_urb_in_use = 0;
1240                 return;
1241         case -EPIPE:
1242                 /* Cannot call usb_clear_halt while in_interrupt */
1243                 /* FALLTHROUGH */
1244         default:
1245                 dev_err(dev, "%s - unexpected nonzero write status received: %d\n",
1246                         __func__, status);
1247                 cypress_set_dead(port);
1248                 break;
1249         }
1250         priv->write_urb_in_use = 0;
1251 
1252         /* send any buffered data */
1253         cypress_send(port);
1254 }
1255 
1256 module_usb_serial_driver(serial_drivers, id_table_combined);
1257 
1258 MODULE_AUTHOR(DRIVER_AUTHOR);
1259 MODULE_DESCRIPTION(DRIVER_DESC);
1260 MODULE_LICENSE("GPL");
1261 
1262 module_param(stats, bool, S_IRUGO | S_IWUSR);
1263 MODULE_PARM_DESC(stats, "Enable statistics or not");
1264 module_param(interval, int, S_IRUGO | S_IWUSR);
1265 MODULE_PARM_DESC(interval, "Overrides interrupt interval");
1266 module_param(unstable_bauds, bool, S_IRUGO | S_IWUSR);
1267 MODULE_PARM_DESC(unstable_bauds, "Allow unstable baud rates");
1268 

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