Merge tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso...
[platform/adaptation/renesas_rcar/renesas_kernel.git] / drivers / usb / serial / cypress_m8.c
1 /*
2  * USB Cypress M8 driver
3  *
4  *      Copyright (C) 2004
5  *          Lonnie Mendez (dignome@gmail.com)
6  *      Copyright (C) 2003,2004
7  *          Neil Whelchel (koyama@firstlight.net)
8  *
9  *      This program is free software; you can redistribute it and/or modify
10  *      it under the terms of the GNU General Public License as published by
11  *      the Free Software Foundation; either version 2 of the License, or
12  *      (at your option) any later version.
13  *
14  * See Documentation/usb/usb-serial.txt for more information on using this
15  * driver
16  *
17  * See http://geocities.com/i0xox0i for information on this driver and the
18  * earthmate usb device.
19  */
20
21 /* Thanks to Neil Whelchel for writing the first cypress m8 implementation
22    for linux. */
23 /* Thanks to cypress for providing references for the hid reports. */
24 /* Thanks to Jiang Zhang for providing links and for general help. */
25 /* Code originates and was built up from ftdi_sio, belkin, pl2303 and others.*/
26
27
28 #include <linux/kernel.h>
29 #include <linux/errno.h>
30 #include <linux/init.h>
31 #include <linux/slab.h>
32 #include <linux/tty.h>
33 #include <linux/tty_driver.h>
34 #include <linux/tty_flip.h>
35 #include <linux/module.h>
36 #include <linux/moduleparam.h>
37 #include <linux/spinlock.h>
38 #include <linux/usb.h>
39 #include <linux/usb/serial.h>
40 #include <linux/serial.h>
41 #include <linux/kfifo.h>
42 #include <linux/delay.h>
43 #include <linux/uaccess.h>
44 #include <asm/unaligned.h>
45
46 #include "cypress_m8.h"
47
48
49 static bool stats;
50 static int interval;
51 static bool unstable_bauds;
52
53 #define DRIVER_AUTHOR "Lonnie Mendez <dignome@gmail.com>, Neil Whelchel <koyama@firstlight.net>"
54 #define DRIVER_DESC "Cypress USB to Serial Driver"
55
56 /* write buffer size defines */
57 #define CYPRESS_BUF_SIZE        1024
58
59 static const struct usb_device_id id_table_earthmate[] = {
60         { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
61         { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
62         { }                                             /* Terminating entry */
63 };
64
65 static const struct usb_device_id id_table_cyphidcomrs232[] = {
66         { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
67         { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) },
68         { }                                             /* Terminating entry */
69 };
70
71 static const struct usb_device_id id_table_nokiaca42v2[] = {
72         { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
73         { }                                             /* Terminating entry */
74 };
75
76 static const struct usb_device_id id_table_combined[] = {
77         { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
78         { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
79         { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
80         { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) },
81         { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
82         { }                                             /* Terminating entry */
83 };
84
85 MODULE_DEVICE_TABLE(usb, id_table_combined);
86
87 enum packet_format {
88         packet_format_1,  /* b0:status, b1:payload count */
89         packet_format_2   /* b0[7:3]:status, b0[2:0]:payload count */
90 };
91
92 struct cypress_private {
93         spinlock_t lock;                   /* private lock */
94         int chiptype;                      /* identifier of device, for quirks/etc */
95         int bytes_in;                      /* used for statistics */
96         int bytes_out;                     /* used for statistics */
97         int cmd_count;                     /* used for statistics */
98         int cmd_ctrl;                      /* always set this to 1 before issuing a command */
99         struct kfifo write_fifo;           /* write fifo */
100         int write_urb_in_use;              /* write urb in use indicator */
101         int write_urb_interval;            /* interval to use for write urb */
102         int read_urb_interval;             /* interval to use for read urb */
103         int comm_is_ok;                    /* true if communication is (still) ok */
104         int termios_initialized;
105         __u8 line_control;                 /* holds dtr / rts value */
106         __u8 current_status;               /* received from last read - info on dsr,cts,cd,ri,etc */
107         __u8 current_config;               /* stores the current configuration byte */
108         __u8 rx_flags;                     /* throttling - used from whiteheat/ftdi_sio */
109         enum packet_format pkt_fmt;        /* format to use for packet send / receive */
110         int get_cfg_unsafe;                /* If true, the CYPRESS_GET_CONFIG is unsafe */
111         int baud_rate;                     /* stores current baud rate in
112                                               integer form */
113         int isthrottled;                   /* if throttled, discard reads */
114         wait_queue_head_t delta_msr_wait;  /* used for TIOCMIWAIT */
115         char prev_status, diff_status;     /* used for TIOCMIWAIT */
116         /* we pass a pointer to this as the argument sent to
117            cypress_set_termios old_termios */
118         struct ktermios tmp_termios;       /* stores the old termios settings */
119 };
120
121 /* function prototypes for the Cypress USB to serial device */
122 static int  cypress_earthmate_port_probe(struct usb_serial_port *port);
123 static int  cypress_hidcom_port_probe(struct usb_serial_port *port);
124 static int  cypress_ca42v2_port_probe(struct usb_serial_port *port);
125 static int  cypress_port_remove(struct usb_serial_port *port);
126 static int  cypress_open(struct tty_struct *tty, struct usb_serial_port *port);
127 static void cypress_close(struct usb_serial_port *port);
128 static void cypress_dtr_rts(struct usb_serial_port *port, int on);
129 static int  cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
130                         const unsigned char *buf, int count);
131 static void cypress_send(struct usb_serial_port *port);
132 static int  cypress_write_room(struct tty_struct *tty);
133 static int  cypress_ioctl(struct tty_struct *tty,
134                         unsigned int cmd, unsigned long arg);
135 static void cypress_set_termios(struct tty_struct *tty,
136                         struct usb_serial_port *port, struct ktermios *old);
137 static int  cypress_tiocmget(struct tty_struct *tty);
138 static int  cypress_tiocmset(struct tty_struct *tty,
139                         unsigned int set, unsigned int clear);
140 static int  cypress_chars_in_buffer(struct tty_struct *tty);
141 static void cypress_throttle(struct tty_struct *tty);
142 static void cypress_unthrottle(struct tty_struct *tty);
143 static void cypress_set_dead(struct usb_serial_port *port);
144 static void cypress_read_int_callback(struct urb *urb);
145 static void cypress_write_int_callback(struct urb *urb);
146
147 static struct usb_serial_driver cypress_earthmate_device = {
148         .driver = {
149                 .owner =                THIS_MODULE,
150                 .name =                 "earthmate",
151         },
152         .description =                  "DeLorme Earthmate USB",
153         .id_table =                     id_table_earthmate,
154         .num_ports =                    1,
155         .port_probe =                   cypress_earthmate_port_probe,
156         .port_remove =                  cypress_port_remove,
157         .open =                         cypress_open,
158         .close =                        cypress_close,
159         .dtr_rts =                      cypress_dtr_rts,
160         .write =                        cypress_write,
161         .write_room =                   cypress_write_room,
162         .ioctl =                        cypress_ioctl,
163         .set_termios =                  cypress_set_termios,
164         .tiocmget =                     cypress_tiocmget,
165         .tiocmset =                     cypress_tiocmset,
166         .chars_in_buffer =              cypress_chars_in_buffer,
167         .throttle =                     cypress_throttle,
168         .unthrottle =                   cypress_unthrottle,
169         .read_int_callback =            cypress_read_int_callback,
170         .write_int_callback =           cypress_write_int_callback,
171 };
172
173 static struct usb_serial_driver cypress_hidcom_device = {
174         .driver = {
175                 .owner =                THIS_MODULE,
176                 .name =                 "cyphidcom",
177         },
178         .description =                  "HID->COM RS232 Adapter",
179         .id_table =                     id_table_cyphidcomrs232,
180         .num_ports =                    1,
181         .port_probe =                   cypress_hidcom_port_probe,
182         .port_remove =                  cypress_port_remove,
183         .open =                         cypress_open,
184         .close =                        cypress_close,
185         .dtr_rts =                      cypress_dtr_rts,
186         .write =                        cypress_write,
187         .write_room =                   cypress_write_room,
188         .ioctl =                        cypress_ioctl,
189         .set_termios =                  cypress_set_termios,
190         .tiocmget =                     cypress_tiocmget,
191         .tiocmset =                     cypress_tiocmset,
192         .chars_in_buffer =              cypress_chars_in_buffer,
193         .throttle =                     cypress_throttle,
194         .unthrottle =                   cypress_unthrottle,
195         .read_int_callback =            cypress_read_int_callback,
196         .write_int_callback =           cypress_write_int_callback,
197 };
198
199 static struct usb_serial_driver cypress_ca42v2_device = {
200         .driver = {
201                 .owner =                THIS_MODULE,
202                 .name =                 "nokiaca42v2",
203         },
204         .description =                  "Nokia CA-42 V2 Adapter",
205         .id_table =                     id_table_nokiaca42v2,
206         .num_ports =                    1,
207         .port_probe =                   cypress_ca42v2_port_probe,
208         .port_remove =                  cypress_port_remove,
209         .open =                         cypress_open,
210         .close =                        cypress_close,
211         .dtr_rts =                      cypress_dtr_rts,
212         .write =                        cypress_write,
213         .write_room =                   cypress_write_room,
214         .ioctl =                        cypress_ioctl,
215         .set_termios =                  cypress_set_termios,
216         .tiocmget =                     cypress_tiocmget,
217         .tiocmset =                     cypress_tiocmset,
218         .chars_in_buffer =              cypress_chars_in_buffer,
219         .throttle =                     cypress_throttle,
220         .unthrottle =                   cypress_unthrottle,
221         .read_int_callback =            cypress_read_int_callback,
222         .write_int_callback =           cypress_write_int_callback,
223 };
224
225 static struct usb_serial_driver * const serial_drivers[] = {
226         &cypress_earthmate_device, &cypress_hidcom_device,
227         &cypress_ca42v2_device, NULL
228 };
229
230 /*****************************************************************************
231  * Cypress serial helper functions
232  *****************************************************************************/
233
234
235 static int analyze_baud_rate(struct usb_serial_port *port, speed_t new_rate)
236 {
237         struct cypress_private *priv;
238         priv = usb_get_serial_port_data(port);
239
240         if (unstable_bauds)
241                 return new_rate;
242
243         /*
244          * The general purpose firmware for the Cypress M8 allows for
245          * a maximum speed of 57600bps (I have no idea whether DeLorme
246          * chose to use the general purpose firmware or not), if you
247          * need to modify this speed setting for your own project
248          * please add your own chiptype and modify the code likewise.
249          * The Cypress HID->COM device will work successfully up to
250          * 115200bps (but the actual throughput is around 3kBps).
251          */
252         if (port->serial->dev->speed == USB_SPEED_LOW) {
253                 /*
254                  * Mike Isely <isely@pobox.com> 2-Feb-2008: The
255                  * Cypress app note that describes this mechanism
256                  * states the the low-speed part can't handle more
257                  * than 800 bytes/sec, in which case 4800 baud is the
258                  * safest speed for a part like that.
259                  */
260                 if (new_rate > 4800) {
261                         dev_dbg(&port->dev,
262                                 "%s - failed setting baud rate, device incapable speed %d\n",
263                                 __func__, new_rate);
264                         return -1;
265                 }
266         }
267         switch (priv->chiptype) {
268         case CT_EARTHMATE:
269                 if (new_rate <= 600) {
270                         /* 300 and 600 baud rates are supported under
271                          * the generic firmware, but are not used with
272                          * NMEA and SiRF protocols */
273                         dev_dbg(&port->dev,
274                                 "%s - failed setting baud rate, unsupported speed of %d on Earthmate GPS",
275                                 __func__, new_rate);
276                         return -1;
277                 }
278                 break;
279         default:
280                 break;
281         }
282         return new_rate;
283 }
284
285
286 /* This function can either set or retrieve the current serial line settings */
287 static int cypress_serial_control(struct tty_struct *tty,
288         struct usb_serial_port *port, speed_t baud_rate, int data_bits,
289         int stop_bits, int parity_enable, int parity_type, int reset,
290         int cypress_request_type)
291 {
292         int new_baudrate = 0, retval = 0, tries = 0;
293         struct cypress_private *priv;
294         struct device *dev = &port->dev;
295         u8 *feature_buffer;
296         const unsigned int feature_len = 5;
297         unsigned long flags;
298
299         priv = usb_get_serial_port_data(port);
300
301         if (!priv->comm_is_ok)
302                 return -ENODEV;
303
304         feature_buffer = kcalloc(feature_len, sizeof(u8), GFP_KERNEL);
305         if (!feature_buffer)
306                 return -ENOMEM;
307
308         switch (cypress_request_type) {
309         case CYPRESS_SET_CONFIG:
310                 /* 0 means 'Hang up' so doesn't change the true bit rate */
311                 new_baudrate = priv->baud_rate;
312                 if (baud_rate && baud_rate != priv->baud_rate) {
313                         dev_dbg(dev, "%s - baud rate is changing\n", __func__);
314                         retval = analyze_baud_rate(port, baud_rate);
315                         if (retval >= 0) {
316                                 new_baudrate = retval;
317                                 dev_dbg(dev, "%s - New baud rate set to %d\n",
318                                         __func__, new_baudrate);
319                         }
320                 }
321                 dev_dbg(dev, "%s - baud rate is being sent as %d\n", __func__,
322                         new_baudrate);
323
324                 /* fill the feature_buffer with new configuration */
325                 put_unaligned_le32(new_baudrate, feature_buffer);
326                 feature_buffer[4] |= data_bits;   /* assign data bits in 2 bit space ( max 3 ) */
327                 /* 1 bit gap */
328                 feature_buffer[4] |= (stop_bits << 3);   /* assign stop bits in 1 bit space */
329                 feature_buffer[4] |= (parity_enable << 4);   /* assign parity flag in 1 bit space */
330                 feature_buffer[4] |= (parity_type << 5);   /* assign parity type in 1 bit space */
331                 /* 1 bit gap */
332                 feature_buffer[4] |= (reset << 7);   /* assign reset at end of byte, 1 bit space */
333
334                 dev_dbg(dev, "%s - device is being sent this feature report:\n", __func__);
335                 dev_dbg(dev, "%s - %02X - %02X - %02X - %02X - %02X\n", __func__,
336                         feature_buffer[0], feature_buffer[1],
337                         feature_buffer[2], feature_buffer[3],
338                         feature_buffer[4]);
339
340                 do {
341                         retval = usb_control_msg(port->serial->dev,
342                                         usb_sndctrlpipe(port->serial->dev, 0),
343                                         HID_REQ_SET_REPORT,
344                                         USB_DIR_OUT | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
345                                         0x0300, 0, feature_buffer,
346                                         feature_len, 500);
347
348                         if (tries++ >= 3)
349                                 break;
350
351                 } while (retval != feature_len &&
352                          retval != -ENODEV);
353
354                 if (retval != feature_len) {
355                         dev_err(dev, "%s - failed sending serial line settings - %d\n",
356                                 __func__, retval);
357                         cypress_set_dead(port);
358                 } else {
359                         spin_lock_irqsave(&priv->lock, flags);
360                         priv->baud_rate = new_baudrate;
361                         priv->current_config = feature_buffer[4];
362                         spin_unlock_irqrestore(&priv->lock, flags);
363                         /* If we asked for a speed change encode it */
364                         if (baud_rate)
365                                 tty_encode_baud_rate(tty,
366                                         new_baudrate, new_baudrate);
367                 }
368         break;
369         case CYPRESS_GET_CONFIG:
370                 if (priv->get_cfg_unsafe) {
371                         /* Not implemented for this device,
372                            and if we try to do it we're likely
373                            to crash the hardware. */
374                         retval = -ENOTTY;
375                         goto out;
376                 }
377                 dev_dbg(dev, "%s - retreiving serial line settings\n", __func__);
378                 do {
379                         retval = usb_control_msg(port->serial->dev,
380                                         usb_rcvctrlpipe(port->serial->dev, 0),
381                                         HID_REQ_GET_REPORT,
382                                         USB_DIR_IN | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
383                                         0x0300, 0, feature_buffer,
384                                         feature_len, 500);
385
386                         if (tries++ >= 3)
387                                 break;
388                 } while (retval != feature_len
389                                                 && retval != -ENODEV);
390
391                 if (retval != feature_len) {
392                         dev_err(dev, "%s - failed to retrieve serial line settings - %d\n",
393                                 __func__, retval);
394                         cypress_set_dead(port);
395                         goto out;
396                 } else {
397                         spin_lock_irqsave(&priv->lock, flags);
398                         /* store the config in one byte, and later
399                            use bit masks to check values */
400                         priv->current_config = feature_buffer[4];
401                         priv->baud_rate = get_unaligned_le32(feature_buffer);
402                         spin_unlock_irqrestore(&priv->lock, flags);
403                 }
404         }
405         spin_lock_irqsave(&priv->lock, flags);
406         ++priv->cmd_count;
407         spin_unlock_irqrestore(&priv->lock, flags);
408 out:
409         kfree(feature_buffer);
410         return retval;
411 } /* cypress_serial_control */
412
413
414 static void cypress_set_dead(struct usb_serial_port *port)
415 {
416         struct cypress_private *priv = usb_get_serial_port_data(port);
417         unsigned long flags;
418
419         spin_lock_irqsave(&priv->lock, flags);
420         if (!priv->comm_is_ok) {
421                 spin_unlock_irqrestore(&priv->lock, flags);
422                 return;
423         }
424         priv->comm_is_ok = 0;
425         spin_unlock_irqrestore(&priv->lock, flags);
426
427         dev_err(&port->dev, "cypress_m8 suspending failing port %d - "
428                 "interval might be too short\n", port->number);
429 }
430
431
432 /*****************************************************************************
433  * Cypress serial driver functions
434  *****************************************************************************/
435
436
437 static int cypress_generic_port_probe(struct usb_serial_port *port)
438 {
439         struct usb_serial *serial = port->serial;
440         struct cypress_private *priv;
441
442         priv = kzalloc(sizeof(struct cypress_private), GFP_KERNEL);
443         if (!priv)
444                 return -ENOMEM;
445
446         priv->comm_is_ok = !0;
447         spin_lock_init(&priv->lock);
448         if (kfifo_alloc(&priv->write_fifo, CYPRESS_BUF_SIZE, GFP_KERNEL)) {
449                 kfree(priv);
450                 return -ENOMEM;
451         }
452         init_waitqueue_head(&priv->delta_msr_wait);
453
454         usb_reset_configuration(serial->dev);
455
456         priv->cmd_ctrl = 0;
457         priv->line_control = 0;
458         priv->termios_initialized = 0;
459         priv->rx_flags = 0;
460         /* Default packet format setting is determined by packet size.
461            Anything with a size larger then 9 must have a separate
462            count field since the 3 bit count field is otherwise too
463            small.  Otherwise we can use the slightly more compact
464            format.  This is in accordance with the cypress_m8 serial
465            converter app note. */
466         if (port->interrupt_out_size > 9)
467                 priv->pkt_fmt = packet_format_1;
468         else
469                 priv->pkt_fmt = packet_format_2;
470
471         if (interval > 0) {
472                 priv->write_urb_interval = interval;
473                 priv->read_urb_interval = interval;
474                 dev_dbg(&port->dev, "%s - read & write intervals forced to %d\n",
475                         __func__, interval);
476         } else {
477                 priv->write_urb_interval = port->interrupt_out_urb->interval;
478                 priv->read_urb_interval = port->interrupt_in_urb->interval;
479                 dev_dbg(&port->dev, "%s - intervals: read=%d write=%d\n",
480                         __func__, priv->read_urb_interval,
481                         priv->write_urb_interval);
482         }
483         usb_set_serial_port_data(port, priv);
484
485         return 0;
486 }
487
488
489 static int cypress_earthmate_port_probe(struct usb_serial_port *port)
490 {
491         struct usb_serial *serial = port->serial;
492         struct cypress_private *priv;
493         int ret;
494
495         ret = cypress_generic_port_probe(port);
496         if (ret) {
497                 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
498                 return ret;
499         }
500
501         priv = usb_get_serial_port_data(port);
502         priv->chiptype = CT_EARTHMATE;
503         /* All Earthmate devices use the separated-count packet
504            format!  Idiotic. */
505         priv->pkt_fmt = packet_format_1;
506         if (serial->dev->descriptor.idProduct !=
507                                 cpu_to_le16(PRODUCT_ID_EARTHMATEUSB)) {
508                 /* The old original USB Earthmate seemed able to
509                    handle GET_CONFIG requests; everything they've
510                    produced since that time crashes if this command is
511                    attempted :-( */
512                 dev_dbg(&port->dev,
513                         "%s - Marking this device as unsafe for GET_CONFIG commands\n",
514                         __func__);
515                 priv->get_cfg_unsafe = !0;
516         }
517
518         return 0;
519 }
520
521 static int cypress_hidcom_port_probe(struct usb_serial_port *port)
522 {
523         struct cypress_private *priv;
524         int ret;
525
526         ret = cypress_generic_port_probe(port);
527         if (ret) {
528                 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
529                 return ret;
530         }
531
532         priv = usb_get_serial_port_data(port);
533         priv->chiptype = CT_CYPHIDCOM;
534
535         return 0;
536 }
537
538 static int cypress_ca42v2_port_probe(struct usb_serial_port *port)
539 {
540         struct cypress_private *priv;
541         int ret;
542
543         ret = cypress_generic_port_probe(port);
544         if (ret) {
545                 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
546                 return ret;
547         }
548
549         priv = usb_get_serial_port_data(port);
550         priv->chiptype = CT_CA42V2;
551
552         return 0;
553 }
554
555 static int cypress_port_remove(struct usb_serial_port *port)
556 {
557         struct cypress_private *priv;
558
559         priv = usb_get_serial_port_data(port);
560
561         kfifo_free(&priv->write_fifo);
562         kfree(priv);
563
564         return 0;
565 }
566
567 static int cypress_open(struct tty_struct *tty, struct usb_serial_port *port)
568 {
569         struct cypress_private *priv = usb_get_serial_port_data(port);
570         struct usb_serial *serial = port->serial;
571         unsigned long flags;
572         int result = 0;
573
574         if (!priv->comm_is_ok)
575                 return -EIO;
576
577         /* clear halts before open */
578         usb_clear_halt(serial->dev, 0x81);
579         usb_clear_halt(serial->dev, 0x02);
580
581         spin_lock_irqsave(&priv->lock, flags);
582         /* reset read/write statistics */
583         priv->bytes_in = 0;
584         priv->bytes_out = 0;
585         priv->cmd_count = 0;
586         priv->rx_flags = 0;
587         spin_unlock_irqrestore(&priv->lock, flags);
588
589         /* Set termios */
590         cypress_send(port);
591
592         if (tty)
593                 cypress_set_termios(tty, port, &priv->tmp_termios);
594
595         /* setup the port and start reading from the device */
596         if (!port->interrupt_in_urb) {
597                 dev_err(&port->dev, "%s - interrupt_in_urb is empty!\n",
598                         __func__);
599                 return -1;
600         }
601
602         usb_fill_int_urb(port->interrupt_in_urb, serial->dev,
603                 usb_rcvintpipe(serial->dev, port->interrupt_in_endpointAddress),
604                 port->interrupt_in_urb->transfer_buffer,
605                 port->interrupt_in_urb->transfer_buffer_length,
606                 cypress_read_int_callback, port, priv->read_urb_interval);
607         result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
608
609         if (result) {
610                 dev_err(&port->dev,
611                         "%s - failed submitting read urb, error %d\n",
612                                                         __func__, result);
613                 cypress_set_dead(port);
614         }
615         port->port.drain_delay = 256;
616         return result;
617 } /* cypress_open */
618
619 static void cypress_dtr_rts(struct usb_serial_port *port, int on)
620 {
621         struct cypress_private *priv = usb_get_serial_port_data(port);
622         /* drop dtr and rts */
623         spin_lock_irq(&priv->lock);
624         if (on == 0)
625                 priv->line_control = 0;
626         else 
627                 priv->line_control = CONTROL_DTR | CONTROL_RTS;
628         priv->cmd_ctrl = 1;
629         spin_unlock_irq(&priv->lock);
630         cypress_write(NULL, port, NULL, 0);
631 }
632
633 static void cypress_close(struct usb_serial_port *port)
634 {
635         struct cypress_private *priv = usb_get_serial_port_data(port);
636         unsigned long flags;
637
638         /* writing is potentially harmful, lock must be taken */
639         mutex_lock(&port->serial->disc_mutex);
640         if (port->serial->disconnected) {
641                 mutex_unlock(&port->serial->disc_mutex);
642                 return;
643         }
644         spin_lock_irqsave(&priv->lock, flags);
645         kfifo_reset_out(&priv->write_fifo);
646         spin_unlock_irqrestore(&priv->lock, flags);
647
648         dev_dbg(&port->dev, "%s - stopping urbs\n", __func__);
649         usb_kill_urb(port->interrupt_in_urb);
650         usb_kill_urb(port->interrupt_out_urb);
651
652         if (stats)
653                 dev_info(&port->dev, "Statistics: %d Bytes In | %d Bytes Out | %d Commands Issued\n",
654                         priv->bytes_in, priv->bytes_out, priv->cmd_count);
655         mutex_unlock(&port->serial->disc_mutex);
656 } /* cypress_close */
657
658
659 static int cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
660                                         const unsigned char *buf, int count)
661 {
662         struct cypress_private *priv = usb_get_serial_port_data(port);
663
664         dev_dbg(&port->dev, "%s - port %d, %d bytes\n", __func__, port->number, count);
665
666         /* line control commands, which need to be executed immediately,
667            are not put into the buffer for obvious reasons.
668          */
669         if (priv->cmd_ctrl) {
670                 count = 0;
671                 goto finish;
672         }
673
674         if (!count)
675                 return count;
676
677         count = kfifo_in_locked(&priv->write_fifo, buf, count, &priv->lock);
678
679 finish:
680         cypress_send(port);
681
682         return count;
683 } /* cypress_write */
684
685
686 static void cypress_send(struct usb_serial_port *port)
687 {
688         int count = 0, result, offset, actual_size;
689         struct cypress_private *priv = usb_get_serial_port_data(port);
690         struct device *dev = &port->dev;
691         unsigned long flags;
692
693         if (!priv->comm_is_ok)
694                 return;
695
696         dev_dbg(dev, "%s - interrupt out size is %d\n", __func__,
697                 port->interrupt_out_size);
698
699         spin_lock_irqsave(&priv->lock, flags);
700         if (priv->write_urb_in_use) {
701                 dev_dbg(dev, "%s - can't write, urb in use\n", __func__);
702                 spin_unlock_irqrestore(&priv->lock, flags);
703                 return;
704         }
705         spin_unlock_irqrestore(&priv->lock, flags);
706
707         /* clear buffer */
708         memset(port->interrupt_out_urb->transfer_buffer, 0,
709                                                 port->interrupt_out_size);
710
711         spin_lock_irqsave(&priv->lock, flags);
712         switch (priv->pkt_fmt) {
713         default:
714         case packet_format_1:
715                 /* this is for the CY7C64013... */
716                 offset = 2;
717                 port->interrupt_out_buffer[0] = priv->line_control;
718                 break;
719         case packet_format_2:
720                 /* this is for the CY7C63743... */
721                 offset = 1;
722                 port->interrupt_out_buffer[0] = priv->line_control;
723                 break;
724         }
725
726         if (priv->line_control & CONTROL_RESET)
727                 priv->line_control &= ~CONTROL_RESET;
728
729         if (priv->cmd_ctrl) {
730                 priv->cmd_count++;
731                 dev_dbg(dev, "%s - line control command being issued\n", __func__);
732                 spin_unlock_irqrestore(&priv->lock, flags);
733                 goto send;
734         } else
735                 spin_unlock_irqrestore(&priv->lock, flags);
736
737         count = kfifo_out_locked(&priv->write_fifo,
738                                         &port->interrupt_out_buffer[offset],
739                                         port->interrupt_out_size - offset,
740                                         &priv->lock);
741         if (count == 0)
742                 return;
743
744         switch (priv->pkt_fmt) {
745         default:
746         case packet_format_1:
747                 port->interrupt_out_buffer[1] = count;
748                 break;
749         case packet_format_2:
750                 port->interrupt_out_buffer[0] |= count;
751         }
752
753         dev_dbg(dev, "%s - count is %d\n", __func__, count);
754
755 send:
756         spin_lock_irqsave(&priv->lock, flags);
757         priv->write_urb_in_use = 1;
758         spin_unlock_irqrestore(&priv->lock, flags);
759
760         if (priv->cmd_ctrl)
761                 actual_size = 1;
762         else
763                 actual_size = count +
764                               (priv->pkt_fmt == packet_format_1 ? 2 : 1);
765
766         usb_serial_debug_data(dev, __func__, port->interrupt_out_size,
767                               port->interrupt_out_urb->transfer_buffer);
768
769         usb_fill_int_urb(port->interrupt_out_urb, port->serial->dev,
770                 usb_sndintpipe(port->serial->dev, port->interrupt_out_endpointAddress),
771                 port->interrupt_out_buffer, port->interrupt_out_size,
772                 cypress_write_int_callback, port, priv->write_urb_interval);
773         result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC);
774         if (result) {
775                 dev_err_console(port,
776                                 "%s - failed submitting write urb, error %d\n",
777                                                         __func__, result);
778                 priv->write_urb_in_use = 0;
779                 cypress_set_dead(port);
780         }
781
782         spin_lock_irqsave(&priv->lock, flags);
783         if (priv->cmd_ctrl)
784                 priv->cmd_ctrl = 0;
785
786         /* do not count the line control and size bytes */
787         priv->bytes_out += count;
788         spin_unlock_irqrestore(&priv->lock, flags);
789
790         usb_serial_port_softint(port);
791 } /* cypress_send */
792
793
794 /* returns how much space is available in the soft buffer */
795 static int cypress_write_room(struct tty_struct *tty)
796 {
797         struct usb_serial_port *port = tty->driver_data;
798         struct cypress_private *priv = usb_get_serial_port_data(port);
799         int room = 0;
800         unsigned long flags;
801
802         spin_lock_irqsave(&priv->lock, flags);
803         room = kfifo_avail(&priv->write_fifo);
804         spin_unlock_irqrestore(&priv->lock, flags);
805
806         dev_dbg(&port->dev, "%s - returns %d\n", __func__, room);
807         return room;
808 }
809
810
811 static int cypress_tiocmget(struct tty_struct *tty)
812 {
813         struct usb_serial_port *port = tty->driver_data;
814         struct cypress_private *priv = usb_get_serial_port_data(port);
815         __u8 status, control;
816         unsigned int result = 0;
817         unsigned long flags;
818
819         spin_lock_irqsave(&priv->lock, flags);
820         control = priv->line_control;
821         status = priv->current_status;
822         spin_unlock_irqrestore(&priv->lock, flags);
823
824         result = ((control & CONTROL_DTR)        ? TIOCM_DTR : 0)
825                 | ((control & CONTROL_RTS)       ? TIOCM_RTS : 0)
826                 | ((status & UART_CTS)        ? TIOCM_CTS : 0)
827                 | ((status & UART_DSR)        ? TIOCM_DSR : 0)
828                 | ((status & UART_RI)         ? TIOCM_RI  : 0)
829                 | ((status & UART_CD)         ? TIOCM_CD  : 0);
830
831         dev_dbg(&port->dev, "%s - result = %x\n", __func__, result);
832
833         return result;
834 }
835
836
837 static int cypress_tiocmset(struct tty_struct *tty,
838                                unsigned int set, unsigned int clear)
839 {
840         struct usb_serial_port *port = tty->driver_data;
841         struct cypress_private *priv = usb_get_serial_port_data(port);
842         unsigned long flags;
843
844         spin_lock_irqsave(&priv->lock, flags);
845         if (set & TIOCM_RTS)
846                 priv->line_control |= CONTROL_RTS;
847         if (set & TIOCM_DTR)
848                 priv->line_control |= CONTROL_DTR;
849         if (clear & TIOCM_RTS)
850                 priv->line_control &= ~CONTROL_RTS;
851         if (clear & TIOCM_DTR)
852                 priv->line_control &= ~CONTROL_DTR;
853         priv->cmd_ctrl = 1;
854         spin_unlock_irqrestore(&priv->lock, flags);
855
856         return cypress_write(tty, port, NULL, 0);
857 }
858
859
860 static int cypress_ioctl(struct tty_struct *tty,
861                                         unsigned int cmd, unsigned long arg)
862 {
863         struct usb_serial_port *port = tty->driver_data;
864         struct cypress_private *priv = usb_get_serial_port_data(port);
865
866         dev_dbg(&port->dev, "%s - port %d, cmd 0x%.4x\n", __func__, port->number, cmd);
867
868         switch (cmd) {
869         /* This code comes from drivers/char/serial.c and ftdi_sio.c */
870         case TIOCMIWAIT:
871                 while (priv != NULL) {
872                         interruptible_sleep_on(&priv->delta_msr_wait);
873                         /* see if a signal did it */
874                         if (signal_pending(current))
875                                 return -ERESTARTSYS;
876                         else {
877                                 char diff = priv->diff_status;
878                                 if (diff == 0)
879                                         return -EIO; /* no change => error */
880
881                                 /* consume all events */
882                                 priv->diff_status = 0;
883
884                                 /* return 0 if caller wanted to know about
885                                    these bits */
886                                 if (((arg & TIOCM_RNG) && (diff & UART_RI)) ||
887                                     ((arg & TIOCM_DSR) && (diff & UART_DSR)) ||
888                                     ((arg & TIOCM_CD) && (diff & UART_CD)) ||
889                                     ((arg & TIOCM_CTS) && (diff & UART_CTS)))
890                                         return 0;
891                                 /* otherwise caller can't care less about what
892                                  * happened, and so we continue to wait for
893                                  * more events.
894                                  */
895                         }
896                 }
897                 return 0;
898         default:
899                 break;
900         }
901         dev_dbg(&port->dev, "%s - arg not supported - it was 0x%04x - check include/asm/ioctls.h\n", __func__, cmd);
902         return -ENOIOCTLCMD;
903 } /* cypress_ioctl */
904
905
906 static void cypress_set_termios(struct tty_struct *tty,
907         struct usb_serial_port *port, struct ktermios *old_termios)
908 {
909         struct cypress_private *priv = usb_get_serial_port_data(port);
910         struct device *dev = &port->dev;
911         int data_bits, stop_bits, parity_type, parity_enable;
912         unsigned cflag, iflag;
913         unsigned long flags;
914         __u8 oldlines;
915         int linechange = 0;
916
917         spin_lock_irqsave(&priv->lock, flags);
918         /* We can't clean this one up as we don't know the device type
919            early enough */
920         if (!priv->termios_initialized) {
921                 if (priv->chiptype == CT_EARTHMATE) {
922                         tty->termios = tty_std_termios;
923                         tty->termios.c_cflag = B4800 | CS8 | CREAD | HUPCL |
924                                 CLOCAL;
925                         tty->termios.c_ispeed = 4800;
926                         tty->termios.c_ospeed = 4800;
927                 } else if (priv->chiptype == CT_CYPHIDCOM) {
928                         tty->termios = tty_std_termios;
929                         tty->termios.c_cflag = B9600 | CS8 | CREAD | HUPCL |
930                                 CLOCAL;
931                         tty->termios.c_ispeed = 9600;
932                         tty->termios.c_ospeed = 9600;
933                 } else if (priv->chiptype == CT_CA42V2) {
934                         tty->termios = tty_std_termios;
935                         tty->termios.c_cflag = B9600 | CS8 | CREAD | HUPCL |
936                                 CLOCAL;
937                         tty->termios.c_ispeed = 9600;
938                         tty->termios.c_ospeed = 9600;
939                 }
940                 priv->termios_initialized = 1;
941         }
942         spin_unlock_irqrestore(&priv->lock, flags);
943
944         /* Unsupported features need clearing */
945         tty->termios.c_cflag &= ~(CMSPAR|CRTSCTS);
946
947         cflag = tty->termios.c_cflag;
948         iflag = tty->termios.c_iflag;
949
950         /* check if there are new settings */
951         if (old_termios) {
952                 spin_lock_irqsave(&priv->lock, flags);
953                 priv->tmp_termios = tty->termios;
954                 spin_unlock_irqrestore(&priv->lock, flags);
955         }
956
957         /* set number of data bits, parity, stop bits */
958         /* when parity is disabled the parity type bit is ignored */
959
960         /* 1 means 2 stop bits, 0 means 1 stop bit */
961         stop_bits = cflag & CSTOPB ? 1 : 0;
962
963         if (cflag & PARENB) {
964                 parity_enable = 1;
965                 /* 1 means odd parity, 0 means even parity */
966                 parity_type = cflag & PARODD ? 1 : 0;
967         } else
968                 parity_enable = parity_type = 0;
969
970         switch (cflag & CSIZE) {
971         case CS5:
972                 data_bits = 0;
973                 break;
974         case CS6:
975                 data_bits = 1;
976                 break;
977         case CS7:
978                 data_bits = 2;
979                 break;
980         case CS8:
981                 data_bits = 3;
982                 break;
983         default:
984                 dev_err(dev, "%s - CSIZE was set, but not CS5-CS8\n", __func__);
985                 data_bits = 3;
986         }
987         spin_lock_irqsave(&priv->lock, flags);
988         oldlines = priv->line_control;
989         if ((cflag & CBAUD) == B0) {
990                 /* drop dtr and rts */
991                 dev_dbg(dev, "%s - dropping the lines, baud rate 0bps\n", __func__);
992                 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
993         } else
994                 priv->line_control = (CONTROL_DTR | CONTROL_RTS);
995         spin_unlock_irqrestore(&priv->lock, flags);
996
997         dev_dbg(dev, "%s - sending %d stop_bits, %d parity_enable, %d parity_type, %d data_bits (+5)\n",
998                 __func__, stop_bits, parity_enable, parity_type, data_bits);
999
1000         cypress_serial_control(tty, port, tty_get_baud_rate(tty),
1001                         data_bits, stop_bits,
1002                         parity_enable, parity_type,
1003                         0, CYPRESS_SET_CONFIG);
1004
1005         /* we perform a CYPRESS_GET_CONFIG so that the current settings are
1006          * filled into the private structure this should confirm that all is
1007          * working if it returns what we just set */
1008         cypress_serial_control(tty, port, 0, 0, 0, 0, 0, 0, CYPRESS_GET_CONFIG);
1009
1010         /* Here we can define custom tty settings for devices; the main tty
1011          * termios flag base comes from empeg.c */
1012
1013         spin_lock_irqsave(&priv->lock, flags);
1014         if (priv->chiptype == CT_EARTHMATE && priv->baud_rate == 4800) {
1015                 dev_dbg(dev, "Using custom termios settings for a baud rate of 4800bps.\n");
1016                 /* define custom termios settings for NMEA protocol */
1017
1018                 tty->termios.c_iflag /* input modes - */
1019                         &= ~(IGNBRK  /* disable ignore break */
1020                         | BRKINT     /* disable break causes interrupt */
1021                         | PARMRK     /* disable mark parity errors */
1022                         | ISTRIP     /* disable clear high bit of input char */
1023                         | INLCR      /* disable translate NL to CR */
1024                         | IGNCR      /* disable ignore CR */
1025                         | ICRNL      /* disable translate CR to NL */
1026                         | IXON);     /* disable enable XON/XOFF flow control */
1027
1028                 tty->termios.c_oflag /* output modes */
1029                         &= ~OPOST;    /* disable postprocess output char */
1030
1031                 tty->termios.c_lflag /* line discipline modes */
1032                         &= ~(ECHO     /* disable echo input characters */
1033                         | ECHONL      /* disable echo new line */
1034                         | ICANON      /* disable erase, kill, werase, and rprnt
1035                                          special characters */
1036                         | ISIG        /* disable interrupt, quit, and suspend
1037                                          special characters */
1038                         | IEXTEN);    /* disable non-POSIX special characters */
1039         } /* CT_CYPHIDCOM: Application should handle this for device */
1040
1041         linechange = (priv->line_control != oldlines);
1042         spin_unlock_irqrestore(&priv->lock, flags);
1043
1044         /* if necessary, set lines */
1045         if (linechange) {
1046                 priv->cmd_ctrl = 1;
1047                 cypress_write(tty, port, NULL, 0);
1048         }
1049 } /* cypress_set_termios */
1050
1051
1052 /* returns amount of data still left in soft buffer */
1053 static int cypress_chars_in_buffer(struct tty_struct *tty)
1054 {
1055         struct usb_serial_port *port = tty->driver_data;
1056         struct cypress_private *priv = usb_get_serial_port_data(port);
1057         int chars = 0;
1058         unsigned long flags;
1059
1060         spin_lock_irqsave(&priv->lock, flags);
1061         chars = kfifo_len(&priv->write_fifo);
1062         spin_unlock_irqrestore(&priv->lock, flags);
1063
1064         dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
1065         return chars;
1066 }
1067
1068
1069 static void cypress_throttle(struct tty_struct *tty)
1070 {
1071         struct usb_serial_port *port = tty->driver_data;
1072         struct cypress_private *priv = usb_get_serial_port_data(port);
1073
1074         spin_lock_irq(&priv->lock);
1075         priv->rx_flags = THROTTLED;
1076         spin_unlock_irq(&priv->lock);
1077 }
1078
1079
1080 static void cypress_unthrottle(struct tty_struct *tty)
1081 {
1082         struct usb_serial_port *port = tty->driver_data;
1083         struct cypress_private *priv = usb_get_serial_port_data(port);
1084         int actually_throttled, result;
1085
1086         spin_lock_irq(&priv->lock);
1087         actually_throttled = priv->rx_flags & ACTUALLY_THROTTLED;
1088         priv->rx_flags = 0;
1089         spin_unlock_irq(&priv->lock);
1090
1091         if (!priv->comm_is_ok)
1092                 return;
1093
1094         if (actually_throttled) {
1095                 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
1096                 if (result) {
1097                         dev_err(&port->dev, "%s - failed submitting read urb, "
1098                                         "error %d\n", __func__, result);
1099                         cypress_set_dead(port);
1100                 }
1101         }
1102 }
1103
1104
1105 static void cypress_read_int_callback(struct urb *urb)
1106 {
1107         struct usb_serial_port *port = urb->context;
1108         struct cypress_private *priv = usb_get_serial_port_data(port);
1109         struct device *dev = &urb->dev->dev;
1110         struct tty_struct *tty;
1111         unsigned char *data = urb->transfer_buffer;
1112         unsigned long flags;
1113         char tty_flag = TTY_NORMAL;
1114         int havedata = 0;
1115         int bytes = 0;
1116         int result;
1117         int i = 0;
1118         int status = urb->status;
1119
1120         switch (status) {
1121         case 0: /* success */
1122                 break;
1123         case -ECONNRESET:
1124         case -ENOENT:
1125         case -ESHUTDOWN:
1126                 /* precursor to disconnect so just go away */
1127                 return;
1128         case -EPIPE:
1129                 /* Can't call usb_clear_halt while in_interrupt */
1130                 /* FALLS THROUGH */
1131         default:
1132                 /* something ugly is going on... */
1133                 dev_err(dev, "%s - unexpected nonzero read status received: %d\n",
1134                         __func__, status);
1135                 cypress_set_dead(port);
1136                 return;
1137         }
1138
1139         spin_lock_irqsave(&priv->lock, flags);
1140         if (priv->rx_flags & THROTTLED) {
1141                 dev_dbg(dev, "%s - now throttling\n", __func__);
1142                 priv->rx_flags |= ACTUALLY_THROTTLED;
1143                 spin_unlock_irqrestore(&priv->lock, flags);
1144                 return;
1145         }
1146         spin_unlock_irqrestore(&priv->lock, flags);
1147
1148         tty = tty_port_tty_get(&port->port);
1149         if (!tty) {
1150                 dev_dbg(dev, "%s - bad tty pointer - exiting\n", __func__);
1151                 return;
1152         }
1153
1154         spin_lock_irqsave(&priv->lock, flags);
1155         result = urb->actual_length;
1156         switch (priv->pkt_fmt) {
1157         default:
1158         case packet_format_1:
1159                 /* This is for the CY7C64013... */
1160                 priv->current_status = data[0] & 0xF8;
1161                 bytes = data[1] + 2;
1162                 i = 2;
1163                 if (bytes > 2)
1164                         havedata = 1;
1165                 break;
1166         case packet_format_2:
1167                 /* This is for the CY7C63743... */
1168                 priv->current_status = data[0] & 0xF8;
1169                 bytes = (data[0] & 0x07) + 1;
1170                 i = 1;
1171                 if (bytes > 1)
1172                         havedata = 1;
1173                 break;
1174         }
1175         spin_unlock_irqrestore(&priv->lock, flags);
1176         if (result < bytes) {
1177                 dev_dbg(dev,
1178                         "%s - wrong packet size - received %d bytes but packet said %d bytes\n",
1179                         __func__, result, bytes);
1180                 goto continue_read;
1181         }
1182
1183         usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
1184
1185         spin_lock_irqsave(&priv->lock, flags);
1186         /* check to see if status has changed */
1187         if (priv->current_status != priv->prev_status) {
1188                 priv->diff_status |= priv->current_status ^
1189                         priv->prev_status;
1190                 wake_up_interruptible(&priv->delta_msr_wait);
1191                 priv->prev_status = priv->current_status;
1192         }
1193         spin_unlock_irqrestore(&priv->lock, flags);
1194
1195         /* hangup, as defined in acm.c... this might be a bad place for it
1196          * though */
1197         if (tty && !(tty->termios.c_cflag & CLOCAL) &&
1198                         !(priv->current_status & UART_CD)) {
1199                 dev_dbg(dev, "%s - calling hangup\n", __func__);
1200                 tty_hangup(tty);
1201                 goto continue_read;
1202         }
1203
1204         /* There is one error bit... I'm assuming it is a parity error
1205          * indicator as the generic firmware will set this bit to 1 if a
1206          * parity error occurs.
1207          * I can not find reference to any other error events. */
1208         spin_lock_irqsave(&priv->lock, flags);
1209         if (priv->current_status & CYP_ERROR) {
1210                 spin_unlock_irqrestore(&priv->lock, flags);
1211                 tty_flag = TTY_PARITY;
1212                 dev_dbg(dev, "%s - Parity Error detected\n", __func__);
1213         } else
1214                 spin_unlock_irqrestore(&priv->lock, flags);
1215
1216         /* process read if there is data other than line status */
1217         if (bytes > i) {
1218                 tty_insert_flip_string_fixed_flag(&port->port, data + i,
1219                                 tty_flag, bytes - i);
1220                 tty_flip_buffer_push(&port->port);
1221         }
1222
1223         spin_lock_irqsave(&priv->lock, flags);
1224         /* control and status byte(s) are also counted */
1225         priv->bytes_in += bytes;
1226         spin_unlock_irqrestore(&priv->lock, flags);
1227
1228 continue_read:
1229         tty_kref_put(tty);
1230
1231         /* Continue trying to always read */
1232
1233         if (priv->comm_is_ok) {
1234                 usb_fill_int_urb(port->interrupt_in_urb, port->serial->dev,
1235                                 usb_rcvintpipe(port->serial->dev,
1236                                         port->interrupt_in_endpointAddress),
1237                                 port->interrupt_in_urb->transfer_buffer,
1238                                 port->interrupt_in_urb->transfer_buffer_length,
1239                                 cypress_read_int_callback, port,
1240                                 priv->read_urb_interval);
1241                 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
1242                 if (result && result != -EPERM) {
1243                         dev_err(dev, "%s - failed resubmitting read urb, error %d\n",
1244                                 __func__, result);
1245                         cypress_set_dead(port);
1246                 }
1247         }
1248 } /* cypress_read_int_callback */
1249
1250
1251 static void cypress_write_int_callback(struct urb *urb)
1252 {
1253         struct usb_serial_port *port = urb->context;
1254         struct cypress_private *priv = usb_get_serial_port_data(port);
1255         struct device *dev = &urb->dev->dev;
1256         int result;
1257         int status = urb->status;
1258
1259         switch (status) {
1260         case 0:
1261                 /* success */
1262                 break;
1263         case -ECONNRESET:
1264         case -ENOENT:
1265         case -ESHUTDOWN:
1266                 /* this urb is terminated, clean up */
1267                 dev_dbg(dev, "%s - urb shutting down with status: %d\n",
1268                         __func__, status);
1269                 priv->write_urb_in_use = 0;
1270                 return;
1271         case -EPIPE: /* no break needed; clear halt and resubmit */
1272                 if (!priv->comm_is_ok)
1273                         break;
1274                 usb_clear_halt(port->serial->dev, 0x02);
1275                 /* error in the urb, so we have to resubmit it */
1276                 dev_dbg(dev, "%s - nonzero write bulk status received: %d\n",
1277                         __func__, status);
1278                 port->interrupt_out_urb->transfer_buffer_length = 1;
1279                 result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC);
1280                 if (!result)
1281                         return;
1282                 dev_err(dev, "%s - failed resubmitting write urb, error %d\n",
1283                         __func__, result);
1284                 cypress_set_dead(port);
1285                 break;
1286         default:
1287                 dev_err(dev, "%s - unexpected nonzero write status received: %d\n",
1288                         __func__, status);
1289                 cypress_set_dead(port);
1290                 break;
1291         }
1292         priv->write_urb_in_use = 0;
1293
1294         /* send any buffered data */
1295         cypress_send(port);
1296 }
1297
1298 module_usb_serial_driver(serial_drivers, id_table_combined);
1299
1300 MODULE_AUTHOR(DRIVER_AUTHOR);
1301 MODULE_DESCRIPTION(DRIVER_DESC);
1302 MODULE_LICENSE("GPL");
1303
1304 module_param(stats, bool, S_IRUGO | S_IWUSR);
1305 MODULE_PARM_DESC(stats, "Enable statistics or not");
1306 module_param(interval, int, S_IRUGO | S_IWUSR);
1307 MODULE_PARM_DESC(interval, "Overrides interrupt interval");
1308 module_param(unstable_bauds, bool, S_IRUGO | S_IWUSR);
1309 MODULE_PARM_DESC(unstable_bauds, "Allow unstable baud rates");