USB: mct_u232: fix broken close
[linux-2.6.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  *  Lonnie Mendez <dignome@gmail.com>
21  *  4-29-2005
22  *      Fixed problem where setting or retreiving the serial config would fail
23  *      with EPIPE.  Removed CRTS toggling so the driver behaves more like
24  *      other usbserial adapters.  Issued new interval of 1ms instead of the
25  *      default 10ms.  As a result, transfer speed has been substantially
26  *      increased from avg. 850bps to avg. 3300bps.  initial termios has also
27  *      been modified.  Cleaned up code and formatting issues so it is more
28  *      readable.  Replaced the C++ style comments.
29  *
30  *  Lonnie Mendez <dignome@gmail.com>
31  *  12-15-2004
32  *      Incorporated write buffering from pl2303 driver.  Fixed bug with line
33  *      handling so both lines are raised in cypress_open. (was dropping rts)
34  *      Various code cleanups made as well along with other misc bug fixes.
35  *
36  *  Lonnie Mendez <dignome@gmail.com>
37  *  04-10-2004
38  *      Driver modified to support dynamic line settings.  Various improvments
39  *      and features.
40  *
41  *  Neil Whelchel
42  *  10-2003
43  *      Driver first released.
44  *
45  */
46
47 /* Thanks to Neil Whelchel for writing the first cypress m8 implementation
48    for linux. */
49 /* Thanks to cypress for providing references for the hid reports. */
50 /* Thanks to Jiang Zhang for providing links and for general help. */
51 /* Code originates and was built up from ftdi_sio, belkin, pl2303 and others.*/
52
53
54 #include <linux/kernel.h>
55 #include <linux/errno.h>
56 #include <linux/init.h>
57 #include <linux/slab.h>
58 #include <linux/tty.h>
59 #include <linux/tty_driver.h>
60 #include <linux/tty_flip.h>
61 #include <linux/module.h>
62 #include <linux/moduleparam.h>
63 #include <linux/spinlock.h>
64 #include <linux/usb.h>
65 #include <linux/usb/serial.h>
66 #include <linux/serial.h>
67 #include <linux/kfifo.h>
68 #include <linux/delay.h>
69 #include <linux/uaccess.h>
70 #include <asm/unaligned.h>
71
72 #include "cypress_m8.h"
73
74
75 static int debug;
76 static int stats;
77 static int interval;
78 static int unstable_bauds;
79
80 /*
81  * Version Information
82  */
83 #define DRIVER_VERSION "v1.10"
84 #define DRIVER_AUTHOR "Lonnie Mendez <dignome@gmail.com>, Neil Whelchel <koyama@firstlight.net>"
85 #define DRIVER_DESC "Cypress USB to Serial Driver"
86
87 /* write buffer size defines */
88 #define CYPRESS_BUF_SIZE        1024
89
90 static const struct usb_device_id id_table_earthmate[] = {
91         { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
92         { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
93         { }                                             /* Terminating entry */
94 };
95
96 static const struct usb_device_id id_table_cyphidcomrs232[] = {
97         { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
98         { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) },
99         { }                                             /* Terminating entry */
100 };
101
102 static const struct usb_device_id id_table_nokiaca42v2[] = {
103         { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
104         { }                                             /* Terminating entry */
105 };
106
107 static const struct usb_device_id id_table_combined[] = {
108         { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
109         { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
110         { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
111         { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) },
112         { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
113         { }                                             /* Terminating entry */
114 };
115
116 MODULE_DEVICE_TABLE(usb, id_table_combined);
117
118 static struct usb_driver cypress_driver = {
119         .name =         "cypress",
120         .probe =        usb_serial_probe,
121         .disconnect =   usb_serial_disconnect,
122         .id_table =     id_table_combined,
123         .no_dynamic_id =        1,
124 };
125
126 enum packet_format {
127         packet_format_1,  /* b0:status, b1:payload count */
128         packet_format_2   /* b0[7:3]:status, b0[2:0]:payload count */
129 };
130
131 struct cypress_private {
132         spinlock_t lock;                   /* private lock */
133         int chiptype;                      /* identifier of device, for quirks/etc */
134         int bytes_in;                      /* used for statistics */
135         int bytes_out;                     /* used for statistics */
136         int cmd_count;                     /* used for statistics */
137         int cmd_ctrl;                      /* always set this to 1 before issuing a command */
138         struct kfifo write_fifo;           /* write fifo */
139         int write_urb_in_use;              /* write urb in use indicator */
140         int write_urb_interval;            /* interval to use for write urb */
141         int read_urb_interval;             /* interval to use for read urb */
142         int comm_is_ok;                    /* true if communication is (still) ok */
143         int termios_initialized;
144         __u8 line_control;                 /* holds dtr / rts value */
145         __u8 current_status;               /* received from last read - info on dsr,cts,cd,ri,etc */
146         __u8 current_config;               /* stores the current configuration byte */
147         __u8 rx_flags;                     /* throttling - used from whiteheat/ftdi_sio */
148         enum packet_format pkt_fmt;        /* format to use for packet send / receive */
149         int get_cfg_unsafe;                /* If true, the CYPRESS_GET_CONFIG is unsafe */
150         int baud_rate;                     /* stores current baud rate in
151                                               integer form */
152         int isthrottled;                   /* if throttled, discard reads */
153         wait_queue_head_t delta_msr_wait;  /* used for TIOCMIWAIT */
154         char prev_status, diff_status;     /* used for TIOCMIWAIT */
155         /* we pass a pointer to this as the argument sent to
156            cypress_set_termios old_termios */
157         struct ktermios tmp_termios;       /* stores the old termios settings */
158 };
159
160 /* function prototypes for the Cypress USB to serial device */
161 static int  cypress_earthmate_startup(struct usb_serial *serial);
162 static int  cypress_hidcom_startup(struct usb_serial *serial);
163 static int  cypress_ca42v2_startup(struct usb_serial *serial);
164 static void cypress_release(struct usb_serial *serial);
165 static int  cypress_open(struct tty_struct *tty, struct usb_serial_port *port);
166 static void cypress_close(struct usb_serial_port *port);
167 static void cypress_dtr_rts(struct usb_serial_port *port, int on);
168 static int  cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
169                         const unsigned char *buf, int count);
170 static void cypress_send(struct usb_serial_port *port);
171 static int  cypress_write_room(struct tty_struct *tty);
172 static int  cypress_ioctl(struct tty_struct *tty, struct file *file,
173                         unsigned int cmd, unsigned long arg);
174 static void cypress_set_termios(struct tty_struct *tty,
175                         struct usb_serial_port *port, struct ktermios *old);
176 static int  cypress_tiocmget(struct tty_struct *tty, struct file *file);
177 static int  cypress_tiocmset(struct tty_struct *tty, struct file *file,
178                         unsigned int set, unsigned int clear);
179 static int  cypress_chars_in_buffer(struct tty_struct *tty);
180 static void cypress_throttle(struct tty_struct *tty);
181 static void cypress_unthrottle(struct tty_struct *tty);
182 static void cypress_set_dead(struct usb_serial_port *port);
183 static void cypress_read_int_callback(struct urb *urb);
184 static void cypress_write_int_callback(struct urb *urb);
185
186 static struct usb_serial_driver cypress_earthmate_device = {
187         .driver = {
188                 .owner =                THIS_MODULE,
189                 .name =                 "earthmate",
190         },
191         .description =                  "DeLorme Earthmate USB",
192         .usb_driver =                   &cypress_driver,
193         .id_table =                     id_table_earthmate,
194         .num_ports =                    1,
195         .attach =                       cypress_earthmate_startup,
196         .release =                      cypress_release,
197         .open =                         cypress_open,
198         .close =                        cypress_close,
199         .dtr_rts =                      cypress_dtr_rts,
200         .write =                        cypress_write,
201         .write_room =                   cypress_write_room,
202         .ioctl =                        cypress_ioctl,
203         .set_termios =                  cypress_set_termios,
204         .tiocmget =                     cypress_tiocmget,
205         .tiocmset =                     cypress_tiocmset,
206         .chars_in_buffer =              cypress_chars_in_buffer,
207         .throttle =                     cypress_throttle,
208         .unthrottle =                   cypress_unthrottle,
209         .read_int_callback =            cypress_read_int_callback,
210         .write_int_callback =           cypress_write_int_callback,
211 };
212
213 static struct usb_serial_driver cypress_hidcom_device = {
214         .driver = {
215                 .owner =                THIS_MODULE,
216                 .name =                 "cyphidcom",
217         },
218         .description =                  "HID->COM RS232 Adapter",
219         .usb_driver =                   &cypress_driver,
220         .id_table =                     id_table_cyphidcomrs232,
221         .num_ports =                    1,
222         .attach =                       cypress_hidcom_startup,
223         .release =                      cypress_release,
224         .open =                         cypress_open,
225         .close =                        cypress_close,
226         .dtr_rts =                      cypress_dtr_rts,
227         .write =                        cypress_write,
228         .write_room =                   cypress_write_room,
229         .ioctl =                        cypress_ioctl,
230         .set_termios =                  cypress_set_termios,
231         .tiocmget =                     cypress_tiocmget,
232         .tiocmset =                     cypress_tiocmset,
233         .chars_in_buffer =              cypress_chars_in_buffer,
234         .throttle =                     cypress_throttle,
235         .unthrottle =                   cypress_unthrottle,
236         .read_int_callback =            cypress_read_int_callback,
237         .write_int_callback =           cypress_write_int_callback,
238 };
239
240 static struct usb_serial_driver cypress_ca42v2_device = {
241         .driver = {
242                 .owner =                THIS_MODULE,
243                 .name =                 "nokiaca42v2",
244         },
245         .description =                  "Nokia CA-42 V2 Adapter",
246         .usb_driver =                   &cypress_driver,
247         .id_table =                     id_table_nokiaca42v2,
248         .num_ports =                    1,
249         .attach =                       cypress_ca42v2_startup,
250         .release =                      cypress_release,
251         .open =                         cypress_open,
252         .close =                        cypress_close,
253         .dtr_rts =                      cypress_dtr_rts,
254         .write =                        cypress_write,
255         .write_room =                   cypress_write_room,
256         .ioctl =                        cypress_ioctl,
257         .set_termios =                  cypress_set_termios,
258         .tiocmget =                     cypress_tiocmget,
259         .tiocmset =                     cypress_tiocmset,
260         .chars_in_buffer =              cypress_chars_in_buffer,
261         .throttle =                     cypress_throttle,
262         .unthrottle =                   cypress_unthrottle,
263         .read_int_callback =            cypress_read_int_callback,
264         .write_int_callback =           cypress_write_int_callback,
265 };
266
267 /*****************************************************************************
268  * Cypress serial helper functions
269  *****************************************************************************/
270
271
272 static int analyze_baud_rate(struct usb_serial_port *port, speed_t new_rate)
273 {
274         struct cypress_private *priv;
275         priv = usb_get_serial_port_data(port);
276
277         if (unstable_bauds)
278                 return new_rate;
279
280         /*
281          * The general purpose firmware for the Cypress M8 allows for
282          * a maximum speed of 57600bps (I have no idea whether DeLorme
283          * chose to use the general purpose firmware or not), if you
284          * need to modify this speed setting for your own project
285          * please add your own chiptype and modify the code likewise.
286          * The Cypress HID->COM device will work successfully up to
287          * 115200bps (but the actual throughput is around 3kBps).
288          */
289         if (port->serial->dev->speed == USB_SPEED_LOW) {
290                 /*
291                  * Mike Isely <isely@pobox.com> 2-Feb-2008: The
292                  * Cypress app note that describes this mechanism
293                  * states the the low-speed part can't handle more
294                  * than 800 bytes/sec, in which case 4800 baud is the
295                  * safest speed for a part like that.
296                  */
297                 if (new_rate > 4800) {
298                         dbg("%s - failed setting baud rate, device incapable "
299                             "speed %d", __func__, new_rate);
300                         return -1;
301                 }
302         }
303         switch (priv->chiptype) {
304         case CT_EARTHMATE:
305                 if (new_rate <= 600) {
306                         /* 300 and 600 baud rates are supported under
307                          * the generic firmware, but are not used with
308                          * NMEA and SiRF protocols */
309                         dbg("%s - failed setting baud rate, unsupported speed "
310                             "of %d on Earthmate GPS", __func__, new_rate);
311                         return -1;
312                 }
313                 break;
314         default:
315                 break;
316         }
317         return new_rate;
318 }
319
320
321 /* This function can either set or retrieve the current serial line settings */
322 static int cypress_serial_control(struct tty_struct *tty,
323         struct usb_serial_port *port, speed_t baud_rate, int data_bits,
324         int stop_bits, int parity_enable, int parity_type, int reset,
325         int cypress_request_type)
326 {
327         int new_baudrate = 0, retval = 0, tries = 0;
328         struct cypress_private *priv;
329         u8 *feature_buffer;
330         const unsigned int feature_len = 5;
331         unsigned long flags;
332
333         dbg("%s", __func__);
334
335         priv = usb_get_serial_port_data(port);
336
337         if (!priv->comm_is_ok)
338                 return -ENODEV;
339
340         feature_buffer = kcalloc(feature_len, sizeof(u8), GFP_KERNEL);
341         if (!feature_buffer)
342                 return -ENOMEM;
343
344         switch (cypress_request_type) {
345         case CYPRESS_SET_CONFIG:
346                 /* 0 means 'Hang up' so doesn't change the true bit rate */
347                 new_baudrate = priv->baud_rate;
348                 if (baud_rate && baud_rate != priv->baud_rate) {
349                         dbg("%s - baud rate is changing", __func__);
350                         retval = analyze_baud_rate(port, baud_rate);
351                         if (retval >= 0) {
352                                 new_baudrate = retval;
353                                 dbg("%s - New baud rate set to %d",
354                                     __func__, new_baudrate);
355                         }
356                 }
357                 dbg("%s - baud rate is being sent as %d",
358                                         __func__, new_baudrate);
359
360                 /* fill the feature_buffer with new configuration */
361                 put_unaligned_le32(new_baudrate, feature_buffer);
362                 feature_buffer[4] |= data_bits;   /* assign data bits in 2 bit space ( max 3 ) */
363                 /* 1 bit gap */
364                 feature_buffer[4] |= (stop_bits << 3);   /* assign stop bits in 1 bit space */
365                 feature_buffer[4] |= (parity_enable << 4);   /* assign parity flag in 1 bit space */
366                 feature_buffer[4] |= (parity_type << 5);   /* assign parity type in 1 bit space */
367                 /* 1 bit gap */
368                 feature_buffer[4] |= (reset << 7);   /* assign reset at end of byte, 1 bit space */
369
370                 dbg("%s - device is being sent this feature report:",
371                                                                 __func__);
372                 dbg("%s - %02X - %02X - %02X - %02X - %02X", __func__,
373                         feature_buffer[0], feature_buffer[1],
374                         feature_buffer[2], feature_buffer[3],
375                         feature_buffer[4]);
376
377                 do {
378                         retval = usb_control_msg(port->serial->dev,
379                                         usb_sndctrlpipe(port->serial->dev, 0),
380                                         HID_REQ_SET_REPORT,
381                                         USB_DIR_OUT | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
382                                         0x0300, 0, feature_buffer,
383                                         feature_len, 500);
384
385                         if (tries++ >= 3)
386                                 break;
387
388                 } while (retval != feature_len &&
389                          retval != -ENODEV);
390
391                 if (retval != feature_len) {
392                         dev_err(&port->dev, "%s - failed sending serial "
393                                 "line settings - %d\n", __func__, retval);
394                         cypress_set_dead(port);
395                 } else {
396                         spin_lock_irqsave(&priv->lock, flags);
397                         priv->baud_rate = new_baudrate;
398                         priv->current_config = feature_buffer[4];
399                         spin_unlock_irqrestore(&priv->lock, flags);
400                         /* If we asked for a speed change encode it */
401                         if (baud_rate)
402                                 tty_encode_baud_rate(tty,
403                                         new_baudrate, new_baudrate);
404                 }
405         break;
406         case CYPRESS_GET_CONFIG:
407                 if (priv->get_cfg_unsafe) {
408                         /* Not implemented for this device,
409                            and if we try to do it we're likely
410                            to crash the hardware. */
411                         retval = -ENOTTY;
412                         goto out;
413                 }
414                 dbg("%s - retreiving serial line settings", __func__);
415                 do {
416                         retval = usb_control_msg(port->serial->dev,
417                                         usb_rcvctrlpipe(port->serial->dev, 0),
418                                         HID_REQ_GET_REPORT,
419                                         USB_DIR_IN | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
420                                         0x0300, 0, feature_buffer,
421                                         feature_len, 500);
422
423                         if (tries++ >= 3)
424                                 break;
425                 } while (retval != feature_len
426                                                 && retval != -ENODEV);
427
428                 if (retval != feature_len) {
429                         dev_err(&port->dev, "%s - failed to retrieve serial "
430                                 "line settings - %d\n", __func__, retval);
431                         cypress_set_dead(port);
432                         goto out;
433                 } else {
434                         spin_lock_irqsave(&priv->lock, flags);
435                         /* store the config in one byte, and later
436                            use bit masks to check values */
437                         priv->current_config = feature_buffer[4];
438                         priv->baud_rate = get_unaligned_le32(feature_buffer);
439                         spin_unlock_irqrestore(&priv->lock, flags);
440                 }
441         }
442         spin_lock_irqsave(&priv->lock, flags);
443         ++priv->cmd_count;
444         spin_unlock_irqrestore(&priv->lock, flags);
445 out:
446         kfree(feature_buffer);
447         return retval;
448 } /* cypress_serial_control */
449
450
451 static void cypress_set_dead(struct usb_serial_port *port)
452 {
453         struct cypress_private *priv = usb_get_serial_port_data(port);
454         unsigned long flags;
455
456         spin_lock_irqsave(&priv->lock, flags);
457         if (!priv->comm_is_ok) {
458                 spin_unlock_irqrestore(&priv->lock, flags);
459                 return;
460         }
461         priv->comm_is_ok = 0;
462         spin_unlock_irqrestore(&priv->lock, flags);
463
464         dev_err(&port->dev, "cypress_m8 suspending failing port %d - "
465                 "interval might be too short\n", port->number);
466 }
467
468
469 /*****************************************************************************
470  * Cypress serial driver functions
471  *****************************************************************************/
472
473
474 static int generic_startup(struct usb_serial *serial)
475 {
476         struct cypress_private *priv;
477         struct usb_serial_port *port = serial->port[0];
478
479         dbg("%s - port %d", __func__, port->number);
480
481         priv = kzalloc(sizeof(struct cypress_private), GFP_KERNEL);
482         if (!priv)
483                 return -ENOMEM;
484
485         priv->comm_is_ok = !0;
486         spin_lock_init(&priv->lock);
487         if (kfifo_alloc(&priv->write_fifo, CYPRESS_BUF_SIZE, GFP_KERNEL)) {
488                 kfree(priv);
489                 return -ENOMEM;
490         }
491         init_waitqueue_head(&priv->delta_msr_wait);
492
493         usb_reset_configuration(serial->dev);
494
495         priv->cmd_ctrl = 0;
496         priv->line_control = 0;
497         priv->termios_initialized = 0;
498         priv->rx_flags = 0;
499         /* Default packet format setting is determined by packet size.
500            Anything with a size larger then 9 must have a separate
501            count field since the 3 bit count field is otherwise too
502            small.  Otherwise we can use the slightly more compact
503            format.  This is in accordance with the cypress_m8 serial
504            converter app note. */
505         if (port->interrupt_out_size > 9)
506                 priv->pkt_fmt = packet_format_1;
507         else
508                 priv->pkt_fmt = packet_format_2;
509
510         if (interval > 0) {
511                 priv->write_urb_interval = interval;
512                 priv->read_urb_interval = interval;
513                 dbg("%s - port %d read & write intervals forced to %d",
514                     __func__, port->number, interval);
515         } else {
516                 priv->write_urb_interval = port->interrupt_out_urb->interval;
517                 priv->read_urb_interval = port->interrupt_in_urb->interval;
518                 dbg("%s - port %d intervals: read=%d write=%d",
519                     __func__, port->number,
520                     priv->read_urb_interval, priv->write_urb_interval);
521         }
522         usb_set_serial_port_data(port, priv);
523
524         return 0;
525 }
526
527
528 static int cypress_earthmate_startup(struct usb_serial *serial)
529 {
530         struct cypress_private *priv;
531         struct usb_serial_port *port = serial->port[0];
532
533         dbg("%s", __func__);
534
535         if (generic_startup(serial)) {
536                 dbg("%s - Failed setting up port %d", __func__,
537                                 port->number);
538                 return 1;
539         }
540
541         priv = usb_get_serial_port_data(port);
542         priv->chiptype = CT_EARTHMATE;
543         /* All Earthmate devices use the separated-count packet
544            format!  Idiotic. */
545         priv->pkt_fmt = packet_format_1;
546         if (serial->dev->descriptor.idProduct !=
547                                 cpu_to_le16(PRODUCT_ID_EARTHMATEUSB)) {
548                 /* The old original USB Earthmate seemed able to
549                    handle GET_CONFIG requests; everything they've
550                    produced since that time crashes if this command is
551                    attempted :-( */
552                 dbg("%s - Marking this device as unsafe for GET_CONFIG "
553                     "commands", __func__);
554                 priv->get_cfg_unsafe = !0;
555         }
556
557         return 0;
558 } /* cypress_earthmate_startup */
559
560
561 static int cypress_hidcom_startup(struct usb_serial *serial)
562 {
563         struct cypress_private *priv;
564
565         dbg("%s", __func__);
566
567         if (generic_startup(serial)) {
568                 dbg("%s - Failed setting up port %d", __func__,
569                                 serial->port[0]->number);
570                 return 1;
571         }
572
573         priv = usb_get_serial_port_data(serial->port[0]);
574         priv->chiptype = CT_CYPHIDCOM;
575
576         return 0;
577 } /* cypress_hidcom_startup */
578
579
580 static int cypress_ca42v2_startup(struct usb_serial *serial)
581 {
582         struct cypress_private *priv;
583
584         dbg("%s", __func__);
585
586         if (generic_startup(serial)) {
587                 dbg("%s - Failed setting up port %d", __func__,
588                                 serial->port[0]->number);
589                 return 1;
590         }
591
592         priv = usb_get_serial_port_data(serial->port[0]);
593         priv->chiptype = CT_CA42V2;
594
595         return 0;
596 } /* cypress_ca42v2_startup */
597
598
599 static void cypress_release(struct usb_serial *serial)
600 {
601         struct cypress_private *priv;
602
603         dbg("%s - port %d", __func__, serial->port[0]->number);
604
605         /* all open ports are closed at this point */
606
607         priv = usb_get_serial_port_data(serial->port[0]);
608
609         if (priv) {
610                 kfifo_free(&priv->write_fifo);
611                 kfree(priv);
612         }
613 }
614
615
616 static int cypress_open(struct tty_struct *tty, struct usb_serial_port *port)
617 {
618         struct cypress_private *priv = usb_get_serial_port_data(port);
619         struct usb_serial *serial = port->serial;
620         unsigned long flags;
621         int result = 0;
622
623         dbg("%s - port %d", __func__, port->number);
624
625         if (!priv->comm_is_ok)
626                 return -EIO;
627
628         /* clear halts before open */
629         usb_clear_halt(serial->dev, 0x81);
630         usb_clear_halt(serial->dev, 0x02);
631
632         spin_lock_irqsave(&priv->lock, flags);
633         /* reset read/write statistics */
634         priv->bytes_in = 0;
635         priv->bytes_out = 0;
636         priv->cmd_count = 0;
637         priv->rx_flags = 0;
638         spin_unlock_irqrestore(&priv->lock, flags);
639
640         /* Set termios */
641         cypress_send(port);
642
643         if (tty)
644                 cypress_set_termios(tty, port, &priv->tmp_termios);
645
646         /* setup the port and start reading from the device */
647         if (!port->interrupt_in_urb) {
648                 dev_err(&port->dev, "%s - interrupt_in_urb is empty!\n",
649                         __func__);
650                 return -1;
651         }
652
653         usb_fill_int_urb(port->interrupt_in_urb, serial->dev,
654                 usb_rcvintpipe(serial->dev, port->interrupt_in_endpointAddress),
655                 port->interrupt_in_urb->transfer_buffer,
656                 port->interrupt_in_urb->transfer_buffer_length,
657                 cypress_read_int_callback, port, priv->read_urb_interval);
658         result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
659
660         if (result) {
661                 dev_err(&port->dev,
662                         "%s - failed submitting read urb, error %d\n",
663                                                         __func__, result);
664                 cypress_set_dead(port);
665         }
666         port->port.drain_delay = 256;
667         return result;
668 } /* cypress_open */
669
670 static void cypress_dtr_rts(struct usb_serial_port *port, int on)
671 {
672         struct cypress_private *priv = usb_get_serial_port_data(port);
673         /* drop dtr and rts */
674         spin_lock_irq(&priv->lock);
675         if (on == 0)
676                 priv->line_control = 0;
677         else 
678                 priv->line_control = CONTROL_DTR | CONTROL_RTS;
679         priv->cmd_ctrl = 1;
680         spin_unlock_irq(&priv->lock);
681         cypress_write(NULL, port, NULL, 0);
682 }
683
684 static void cypress_close(struct usb_serial_port *port)
685 {
686         struct cypress_private *priv = usb_get_serial_port_data(port);
687         unsigned long flags;
688
689         dbg("%s - port %d", __func__, port->number);
690
691         /* writing is potentially harmful, lock must be taken */
692         mutex_lock(&port->serial->disc_mutex);
693         if (port->serial->disconnected) {
694                 mutex_unlock(&port->serial->disc_mutex);
695                 return;
696         }
697         spin_lock_irqsave(&priv->lock, flags);
698         kfifo_reset_out(&priv->write_fifo);
699         spin_unlock_irqrestore(&priv->lock, flags);
700
701         dbg("%s - stopping urbs", __func__);
702         usb_kill_urb(port->interrupt_in_urb);
703         usb_kill_urb(port->interrupt_out_urb);
704
705         if (stats)
706                 dev_info(&port->dev, "Statistics: %d Bytes In | %d Bytes Out | %d Commands Issued\n",
707                         priv->bytes_in, priv->bytes_out, priv->cmd_count);
708         mutex_unlock(&port->serial->disc_mutex);
709 } /* cypress_close */
710
711
712 static int cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
713                                         const unsigned char *buf, int count)
714 {
715         struct cypress_private *priv = usb_get_serial_port_data(port);
716
717         dbg("%s - port %d, %d bytes", __func__, port->number, count);
718
719         /* line control commands, which need to be executed immediately,
720            are not put into the buffer for obvious reasons.
721          */
722         if (priv->cmd_ctrl) {
723                 count = 0;
724                 goto finish;
725         }
726
727         if (!count)
728                 return count;
729
730         count = kfifo_in_locked(&priv->write_fifo, buf, count, &priv->lock);
731
732 finish:
733         cypress_send(port);
734
735         return count;
736 } /* cypress_write */
737
738
739 static void cypress_send(struct usb_serial_port *port)
740 {
741         int count = 0, result, offset, actual_size;
742         struct cypress_private *priv = usb_get_serial_port_data(port);
743         unsigned long flags;
744
745         if (!priv->comm_is_ok)
746                 return;
747
748         dbg("%s - port %d", __func__, port->number);
749         dbg("%s - interrupt out size is %d", __func__,
750                                                 port->interrupt_out_size);
751
752         spin_lock_irqsave(&priv->lock, flags);
753         if (priv->write_urb_in_use) {
754                 dbg("%s - can't write, urb in use", __func__);
755                 spin_unlock_irqrestore(&priv->lock, flags);
756                 return;
757         }
758         spin_unlock_irqrestore(&priv->lock, flags);
759
760         /* clear buffer */
761         memset(port->interrupt_out_urb->transfer_buffer, 0,
762                                                 port->interrupt_out_size);
763
764         spin_lock_irqsave(&priv->lock, flags);
765         switch (priv->pkt_fmt) {
766         default:
767         case packet_format_1:
768                 /* this is for the CY7C64013... */
769                 offset = 2;
770                 port->interrupt_out_buffer[0] = priv->line_control;
771                 break;
772         case packet_format_2:
773                 /* this is for the CY7C63743... */
774                 offset = 1;
775                 port->interrupt_out_buffer[0] = priv->line_control;
776                 break;
777         }
778
779         if (priv->line_control & CONTROL_RESET)
780                 priv->line_control &= ~CONTROL_RESET;
781
782         if (priv->cmd_ctrl) {
783                 priv->cmd_count++;
784                 dbg("%s - line control command being issued", __func__);
785                 spin_unlock_irqrestore(&priv->lock, flags);
786                 goto send;
787         } else
788                 spin_unlock_irqrestore(&priv->lock, flags);
789
790         count = kfifo_out_locked(&priv->write_fifo,
791                                         &port->interrupt_out_buffer[offset],
792                                         port->interrupt_out_size - offset,
793                                         &priv->lock);
794         if (count == 0)
795                 return;
796
797         switch (priv->pkt_fmt) {
798         default:
799         case packet_format_1:
800                 port->interrupt_out_buffer[1] = count;
801                 break;
802         case packet_format_2:
803                 port->interrupt_out_buffer[0] |= count;
804         }
805
806         dbg("%s - count is %d", __func__, count);
807
808 send:
809         spin_lock_irqsave(&priv->lock, flags);
810         priv->write_urb_in_use = 1;
811         spin_unlock_irqrestore(&priv->lock, flags);
812
813         if (priv->cmd_ctrl)
814                 actual_size = 1;
815         else
816                 actual_size = count +
817                               (priv->pkt_fmt == packet_format_1 ? 2 : 1);
818
819         usb_serial_debug_data(debug, &port->dev, __func__,
820                 port->interrupt_out_size,
821                 port->interrupt_out_urb->transfer_buffer);
822
823         usb_fill_int_urb(port->interrupt_out_urb, port->serial->dev,
824                 usb_sndintpipe(port->serial->dev, port->interrupt_out_endpointAddress),
825                 port->interrupt_out_buffer, port->interrupt_out_size,
826                 cypress_write_int_callback, port, priv->write_urb_interval);
827         result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC);
828         if (result) {
829                 dev_err(&port->dev,
830                                 "%s - failed submitting write urb, error %d\n",
831                                                         __func__, result);
832                 priv->write_urb_in_use = 0;
833                 cypress_set_dead(port);
834         }
835
836         spin_lock_irqsave(&priv->lock, flags);
837         if (priv->cmd_ctrl)
838                 priv->cmd_ctrl = 0;
839
840         /* do not count the line control and size bytes */
841         priv->bytes_out += count;
842         spin_unlock_irqrestore(&priv->lock, flags);
843
844         usb_serial_port_softint(port);
845 } /* cypress_send */
846
847
848 /* returns how much space is available in the soft buffer */
849 static int cypress_write_room(struct tty_struct *tty)
850 {
851         struct usb_serial_port *port = tty->driver_data;
852         struct cypress_private *priv = usb_get_serial_port_data(port);
853         int room = 0;
854         unsigned long flags;
855
856         dbg("%s - port %d", __func__, port->number);
857
858         spin_lock_irqsave(&priv->lock, flags);
859         room = kfifo_avail(&priv->write_fifo);
860         spin_unlock_irqrestore(&priv->lock, flags);
861
862         dbg("%s - returns %d", __func__, room);
863         return room;
864 }
865
866
867 static int cypress_tiocmget(struct tty_struct *tty, struct file *file)
868 {
869         struct usb_serial_port *port = tty->driver_data;
870         struct cypress_private *priv = usb_get_serial_port_data(port);
871         __u8 status, control;
872         unsigned int result = 0;
873         unsigned long flags;
874
875         dbg("%s - port %d", __func__, port->number);
876
877         spin_lock_irqsave(&priv->lock, flags);
878         control = priv->line_control;
879         status = priv->current_status;
880         spin_unlock_irqrestore(&priv->lock, flags);
881
882         result = ((control & CONTROL_DTR)        ? TIOCM_DTR : 0)
883                 | ((control & CONTROL_RTS)       ? TIOCM_RTS : 0)
884                 | ((status & UART_CTS)        ? TIOCM_CTS : 0)
885                 | ((status & UART_DSR)        ? TIOCM_DSR : 0)
886                 | ((status & UART_RI)         ? TIOCM_RI  : 0)
887                 | ((status & UART_CD)         ? TIOCM_CD  : 0);
888
889         dbg("%s - result = %x", __func__, result);
890
891         return result;
892 }
893
894
895 static int cypress_tiocmset(struct tty_struct *tty, struct file *file,
896                                unsigned int set, unsigned int clear)
897 {
898         struct usb_serial_port *port = tty->driver_data;
899         struct cypress_private *priv = usb_get_serial_port_data(port);
900         unsigned long flags;
901
902         dbg("%s - port %d", __func__, port->number);
903
904         spin_lock_irqsave(&priv->lock, flags);
905         if (set & TIOCM_RTS)
906                 priv->line_control |= CONTROL_RTS;
907         if (set & TIOCM_DTR)
908                 priv->line_control |= CONTROL_DTR;
909         if (clear & TIOCM_RTS)
910                 priv->line_control &= ~CONTROL_RTS;
911         if (clear & TIOCM_DTR)
912                 priv->line_control &= ~CONTROL_DTR;
913         priv->cmd_ctrl = 1;
914         spin_unlock_irqrestore(&priv->lock, flags);
915
916         return cypress_write(tty, port, NULL, 0);
917 }
918
919
920 static int cypress_ioctl(struct tty_struct *tty, struct file *file,
921                                         unsigned int cmd, unsigned long arg)
922 {
923         struct usb_serial_port *port = tty->driver_data;
924         struct cypress_private *priv = usb_get_serial_port_data(port);
925
926         dbg("%s - port %d, cmd 0x%.4x", __func__, port->number, cmd);
927
928         switch (cmd) {
929         /* This code comes from drivers/char/serial.c and ftdi_sio.c */
930         case TIOCMIWAIT:
931                 while (priv != NULL) {
932                         interruptible_sleep_on(&priv->delta_msr_wait);
933                         /* see if a signal did it */
934                         if (signal_pending(current))
935                                 return -ERESTARTSYS;
936                         else {
937                                 char diff = priv->diff_status;
938                                 if (diff == 0)
939                                         return -EIO; /* no change => error */
940
941                                 /* consume all events */
942                                 priv->diff_status = 0;
943
944                                 /* return 0 if caller wanted to know about
945                                    these bits */
946                                 if (((arg & TIOCM_RNG) && (diff & UART_RI)) ||
947                                     ((arg & TIOCM_DSR) && (diff & UART_DSR)) ||
948                                     ((arg & TIOCM_CD) && (diff & UART_CD)) ||
949                                     ((arg & TIOCM_CTS) && (diff & UART_CTS)))
950                                         return 0;
951                                 /* otherwise caller can't care less about what
952                                  * happened, and so we continue to wait for
953                                  * more events.
954                                  */
955                         }
956                 }
957                 return 0;
958         default:
959                 break;
960         }
961         dbg("%s - arg not supported - it was 0x%04x - check include/asm/ioctls.h", __func__, cmd);
962         return -ENOIOCTLCMD;
963 } /* cypress_ioctl */
964
965
966 static void cypress_set_termios(struct tty_struct *tty,
967         struct usb_serial_port *port, struct ktermios *old_termios)
968 {
969         struct cypress_private *priv = usb_get_serial_port_data(port);
970         int data_bits, stop_bits, parity_type, parity_enable;
971         unsigned cflag, iflag;
972         unsigned long flags;
973         __u8 oldlines;
974         int linechange = 0;
975
976         dbg("%s - port %d", __func__, port->number);
977
978         spin_lock_irqsave(&priv->lock, flags);
979         /* We can't clean this one up as we don't know the device type
980            early enough */
981         if (!priv->termios_initialized) {
982                 if (priv->chiptype == CT_EARTHMATE) {
983                         *(tty->termios) = tty_std_termios;
984                         tty->termios->c_cflag = B4800 | CS8 | CREAD | HUPCL |
985                                 CLOCAL;
986                         tty->termios->c_ispeed = 4800;
987                         tty->termios->c_ospeed = 4800;
988                 } else if (priv->chiptype == CT_CYPHIDCOM) {
989                         *(tty->termios) = tty_std_termios;
990                         tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL |
991                                 CLOCAL;
992                         tty->termios->c_ispeed = 9600;
993                         tty->termios->c_ospeed = 9600;
994                 } else if (priv->chiptype == CT_CA42V2) {
995                         *(tty->termios) = tty_std_termios;
996                         tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL |
997                                 CLOCAL;
998                         tty->termios->c_ispeed = 9600;
999                         tty->termios->c_ospeed = 9600;
1000                 }
1001                 priv->termios_initialized = 1;
1002         }
1003         spin_unlock_irqrestore(&priv->lock, flags);
1004
1005         /* Unsupported features need clearing */
1006         tty->termios->c_cflag &= ~(CMSPAR|CRTSCTS);
1007
1008         cflag = tty->termios->c_cflag;
1009         iflag = tty->termios->c_iflag;
1010
1011         /* check if there are new settings */
1012         if (old_termios) {
1013                 spin_lock_irqsave(&priv->lock, flags);
1014                 priv->tmp_termios = *(tty->termios);
1015                 spin_unlock_irqrestore(&priv->lock, flags);
1016         }
1017
1018         /* set number of data bits, parity, stop bits */
1019         /* when parity is disabled the parity type bit is ignored */
1020
1021         /* 1 means 2 stop bits, 0 means 1 stop bit */
1022         stop_bits = cflag & CSTOPB ? 1 : 0;
1023
1024         if (cflag & PARENB) {
1025                 parity_enable = 1;
1026                 /* 1 means odd parity, 0 means even parity */
1027                 parity_type = cflag & PARODD ? 1 : 0;
1028         } else
1029                 parity_enable = parity_type = 0;
1030
1031         switch (cflag & CSIZE) {
1032         case CS5:
1033                 data_bits = 0;
1034                 break;
1035         case CS6:
1036                 data_bits = 1;
1037                 break;
1038         case CS7:
1039                 data_bits = 2;
1040                 break;
1041         case CS8:
1042                 data_bits = 3;
1043                 break;
1044         default:
1045                 dev_err(&port->dev, "%s - CSIZE was set, but not CS5-CS8\n",
1046                         __func__);
1047                 data_bits = 3;
1048         }
1049         spin_lock_irqsave(&priv->lock, flags);
1050         oldlines = priv->line_control;
1051         if ((cflag & CBAUD) == B0) {
1052                 /* drop dtr and rts */
1053                 dbg("%s - dropping the lines, baud rate 0bps", __func__);
1054                 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
1055         } else
1056                 priv->line_control = (CONTROL_DTR | CONTROL_RTS);
1057         spin_unlock_irqrestore(&priv->lock, flags);
1058
1059         dbg("%s - sending %d stop_bits, %d parity_enable, %d parity_type, "
1060                         "%d data_bits (+5)", __func__, stop_bits,
1061                         parity_enable, parity_type, data_bits);
1062
1063         cypress_serial_control(tty, port, tty_get_baud_rate(tty),
1064                         data_bits, stop_bits,
1065                         parity_enable, parity_type,
1066                         0, CYPRESS_SET_CONFIG);
1067
1068         /* we perform a CYPRESS_GET_CONFIG so that the current settings are
1069          * filled into the private structure this should confirm that all is
1070          * working if it returns what we just set */
1071         cypress_serial_control(tty, port, 0, 0, 0, 0, 0, 0, CYPRESS_GET_CONFIG);
1072
1073         /* Here we can define custom tty settings for devices; the main tty
1074          * termios flag base comes from empeg.c */
1075
1076         spin_lock_irqsave(&priv->lock, flags);
1077         if (priv->chiptype == CT_EARTHMATE && priv->baud_rate == 4800) {
1078                 dbg("Using custom termios settings for a baud rate of "
1079                                 "4800bps.");
1080                 /* define custom termios settings for NMEA protocol */
1081
1082                 tty->termios->c_iflag /* input modes - */
1083                         &= ~(IGNBRK  /* disable ignore break */
1084                         | BRKINT     /* disable break causes interrupt */
1085                         | PARMRK     /* disable mark parity errors */
1086                         | ISTRIP     /* disable clear high bit of input char */
1087                         | INLCR      /* disable translate NL to CR */
1088                         | IGNCR      /* disable ignore CR */
1089                         | ICRNL      /* disable translate CR to NL */
1090                         | IXON);     /* disable enable XON/XOFF flow control */
1091
1092                 tty->termios->c_oflag /* output modes */
1093                         &= ~OPOST;    /* disable postprocess output char */
1094
1095                 tty->termios->c_lflag /* line discipline modes */
1096                         &= ~(ECHO     /* disable echo input characters */
1097                         | ECHONL      /* disable echo new line */
1098                         | ICANON      /* disable erase, kill, werase, and rprnt
1099                                          special characters */
1100                         | ISIG        /* disable interrupt, quit, and suspend
1101                                          special characters */
1102                         | IEXTEN);    /* disable non-POSIX special characters */
1103         } /* CT_CYPHIDCOM: Application should handle this for device */
1104
1105         linechange = (priv->line_control != oldlines);
1106         spin_unlock_irqrestore(&priv->lock, flags);
1107
1108         /* if necessary, set lines */
1109         if (linechange) {
1110                 priv->cmd_ctrl = 1;
1111                 cypress_write(tty, port, NULL, 0);
1112         }
1113 } /* cypress_set_termios */
1114
1115
1116 /* returns amount of data still left in soft buffer */
1117 static int cypress_chars_in_buffer(struct tty_struct *tty)
1118 {
1119         struct usb_serial_port *port = tty->driver_data;
1120         struct cypress_private *priv = usb_get_serial_port_data(port);
1121         int chars = 0;
1122         unsigned long flags;
1123
1124         dbg("%s - port %d", __func__, port->number);
1125
1126         spin_lock_irqsave(&priv->lock, flags);
1127         chars = kfifo_len(&priv->write_fifo);
1128         spin_unlock_irqrestore(&priv->lock, flags);
1129
1130         dbg("%s - returns %d", __func__, chars);
1131         return chars;
1132 }
1133
1134
1135 static void cypress_throttle(struct tty_struct *tty)
1136 {
1137         struct usb_serial_port *port = tty->driver_data;
1138         struct cypress_private *priv = usb_get_serial_port_data(port);
1139
1140         dbg("%s - port %d", __func__, port->number);
1141
1142         spin_lock_irq(&priv->lock);
1143         priv->rx_flags = THROTTLED;
1144         spin_unlock_irq(&priv->lock);
1145 }
1146
1147
1148 static void cypress_unthrottle(struct tty_struct *tty)
1149 {
1150         struct usb_serial_port *port = tty->driver_data;
1151         struct cypress_private *priv = usb_get_serial_port_data(port);
1152         int actually_throttled, result;
1153
1154         dbg("%s - port %d", __func__, port->number);
1155
1156         spin_lock_irq(&priv->lock);
1157         actually_throttled = priv->rx_flags & ACTUALLY_THROTTLED;
1158         priv->rx_flags = 0;
1159         spin_unlock_irq(&priv->lock);
1160
1161         if (!priv->comm_is_ok)
1162                 return;
1163
1164         if (actually_throttled) {
1165                 port->interrupt_in_urb->dev = port->serial->dev;
1166
1167                 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
1168                 if (result) {
1169                         dev_err(&port->dev, "%s - failed submitting read urb, "
1170                                         "error %d\n", __func__, result);
1171                         cypress_set_dead(port);
1172                 }
1173         }
1174 }
1175
1176
1177 static void cypress_read_int_callback(struct urb *urb)
1178 {
1179         struct usb_serial_port *port = urb->context;
1180         struct cypress_private *priv = usb_get_serial_port_data(port);
1181         struct tty_struct *tty;
1182         unsigned char *data = urb->transfer_buffer;
1183         unsigned long flags;
1184         char tty_flag = TTY_NORMAL;
1185         int havedata = 0;
1186         int bytes = 0;
1187         int result;
1188         int i = 0;
1189         int status = urb->status;
1190
1191         dbg("%s - port %d", __func__, port->number);
1192
1193         switch (status) {
1194         case 0: /* success */
1195                 break;
1196         case -ECONNRESET:
1197         case -ENOENT:
1198         case -ESHUTDOWN:
1199                 /* precursor to disconnect so just go away */
1200                 return;
1201         case -EPIPE:
1202                 /* Can't call usb_clear_halt while in_interrupt */
1203                 /* FALLS THROUGH */
1204         default:
1205                 /* something ugly is going on... */
1206                 dev_err(&urb->dev->dev,
1207                         "%s - unexpected nonzero read status received: %d\n",
1208                                                         __func__, status);
1209                 cypress_set_dead(port);
1210                 return;
1211         }
1212
1213         spin_lock_irqsave(&priv->lock, flags);
1214         if (priv->rx_flags & THROTTLED) {
1215                 dbg("%s - now throttling", __func__);
1216                 priv->rx_flags |= ACTUALLY_THROTTLED;
1217                 spin_unlock_irqrestore(&priv->lock, flags);
1218                 return;
1219         }
1220         spin_unlock_irqrestore(&priv->lock, flags);
1221
1222         tty = tty_port_tty_get(&port->port);
1223         if (!tty) {
1224                 dbg("%s - bad tty pointer - exiting", __func__);
1225                 return;
1226         }
1227
1228         spin_lock_irqsave(&priv->lock, flags);
1229         result = urb->actual_length;
1230         switch (priv->pkt_fmt) {
1231         default:
1232         case packet_format_1:
1233                 /* This is for the CY7C64013... */
1234                 priv->current_status = data[0] & 0xF8;
1235                 bytes = data[1] + 2;
1236                 i = 2;
1237                 if (bytes > 2)
1238                         havedata = 1;
1239                 break;
1240         case packet_format_2:
1241                 /* This is for the CY7C63743... */
1242                 priv->current_status = data[0] & 0xF8;
1243                 bytes = (data[0] & 0x07) + 1;
1244                 i = 1;
1245                 if (bytes > 1)
1246                         havedata = 1;
1247                 break;
1248         }
1249         spin_unlock_irqrestore(&priv->lock, flags);
1250         if (result < bytes) {
1251                 dbg("%s - wrong packet size - received %d bytes but packet "
1252                     "said %d bytes", __func__, result, bytes);
1253                 goto continue_read;
1254         }
1255
1256         usb_serial_debug_data(debug, &port->dev, __func__,
1257                                                 urb->actual_length, data);
1258
1259         spin_lock_irqsave(&priv->lock, flags);
1260         /* check to see if status has changed */
1261         if (priv->current_status != priv->prev_status) {
1262                 priv->diff_status |= priv->current_status ^
1263                         priv->prev_status;
1264                 wake_up_interruptible(&priv->delta_msr_wait);
1265                 priv->prev_status = priv->current_status;
1266         }
1267         spin_unlock_irqrestore(&priv->lock, flags);
1268
1269         /* hangup, as defined in acm.c... this might be a bad place for it
1270          * though */
1271         if (tty && !(tty->termios->c_cflag & CLOCAL) &&
1272                         !(priv->current_status & UART_CD)) {
1273                 dbg("%s - calling hangup", __func__);
1274                 tty_hangup(tty);
1275                 goto continue_read;
1276         }
1277
1278         /* There is one error bit... I'm assuming it is a parity error
1279          * indicator as the generic firmware will set this bit to 1 if a
1280          * parity error occurs.
1281          * I can not find reference to any other error events. */
1282         spin_lock_irqsave(&priv->lock, flags);
1283         if (priv->current_status & CYP_ERROR) {
1284                 spin_unlock_irqrestore(&priv->lock, flags);
1285                 tty_flag = TTY_PARITY;
1286                 dbg("%s - Parity Error detected", __func__);
1287         } else
1288                 spin_unlock_irqrestore(&priv->lock, flags);
1289
1290         /* process read if there is data other than line status */
1291         if (tty && bytes > i) {
1292                 tty_insert_flip_string_fixed_flag(tty, data + i,
1293                                 tty_flag, bytes - i);
1294                 tty_flip_buffer_push(tty);
1295         }
1296
1297         spin_lock_irqsave(&priv->lock, flags);
1298         /* control and status byte(s) are also counted */
1299         priv->bytes_in += bytes;
1300         spin_unlock_irqrestore(&priv->lock, flags);
1301
1302 continue_read:
1303         tty_kref_put(tty);
1304
1305         /* Continue trying to always read */
1306
1307         if (priv->comm_is_ok) {
1308                 usb_fill_int_urb(port->interrupt_in_urb, port->serial->dev,
1309                                 usb_rcvintpipe(port->serial->dev,
1310                                         port->interrupt_in_endpointAddress),
1311                                 port->interrupt_in_urb->transfer_buffer,
1312                                 port->interrupt_in_urb->transfer_buffer_length,
1313                                 cypress_read_int_callback, port,
1314                                 priv->read_urb_interval);
1315                 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
1316                 if (result && result != -EPERM) {
1317                         dev_err(&urb->dev->dev, "%s - failed resubmitting "
1318                                         "read urb, error %d\n", __func__,
1319                                         result);
1320                         cypress_set_dead(port);
1321                 }
1322         }
1323
1324         return;
1325 } /* cypress_read_int_callback */
1326
1327
1328 static void cypress_write_int_callback(struct urb *urb)
1329 {
1330         struct usb_serial_port *port = urb->context;
1331         struct cypress_private *priv = usb_get_serial_port_data(port);
1332         int result;
1333         int status = urb->status;
1334
1335         dbg("%s - port %d", __func__, port->number);
1336
1337         switch (status) {
1338         case 0:
1339                 /* success */
1340                 break;
1341         case -ECONNRESET:
1342         case -ENOENT:
1343         case -ESHUTDOWN:
1344                 /* this urb is terminated, clean up */
1345                 dbg("%s - urb shutting down with status: %d",
1346                                                 __func__, status);
1347                 priv->write_urb_in_use = 0;
1348                 return;
1349         case -EPIPE: /* no break needed; clear halt and resubmit */
1350                 if (!priv->comm_is_ok)
1351                         break;
1352                 usb_clear_halt(port->serial->dev, 0x02);
1353                 /* error in the urb, so we have to resubmit it */
1354                 dbg("%s - nonzero write bulk status received: %d",
1355                         __func__, status);
1356                 port->interrupt_out_urb->transfer_buffer_length = 1;
1357                 port->interrupt_out_urb->dev = port->serial->dev;
1358                 result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC);
1359                 if (!result)
1360                         return;
1361                 dev_err(&urb->dev->dev,
1362                         "%s - failed resubmitting write urb, error %d\n",
1363                                                         __func__, result);
1364                 cypress_set_dead(port);
1365                 break;
1366         default:
1367                 dev_err(&urb->dev->dev,
1368                          "%s - unexpected nonzero write status received: %d\n",
1369                                                         __func__, status);
1370                 cypress_set_dead(port);
1371                 break;
1372         }
1373         priv->write_urb_in_use = 0;
1374
1375         /* send any buffered data */
1376         cypress_send(port);
1377 }
1378
1379
1380 /*****************************************************************************
1381  * Module functions
1382  *****************************************************************************/
1383
1384 static int __init cypress_init(void)
1385 {
1386         int retval;
1387
1388         dbg("%s", __func__);
1389
1390         retval = usb_serial_register(&cypress_earthmate_device);
1391         if (retval)
1392                 goto failed_em_register;
1393         retval = usb_serial_register(&cypress_hidcom_device);
1394         if (retval)
1395                 goto failed_hidcom_register;
1396         retval = usb_serial_register(&cypress_ca42v2_device);
1397         if (retval)
1398                 goto failed_ca42v2_register;
1399         retval = usb_register(&cypress_driver);
1400         if (retval)
1401                 goto failed_usb_register;
1402
1403         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
1404                DRIVER_DESC "\n");
1405         return 0;
1406
1407 failed_usb_register:
1408         usb_serial_deregister(&cypress_ca42v2_device);
1409 failed_ca42v2_register:
1410         usb_serial_deregister(&cypress_hidcom_device);
1411 failed_hidcom_register:
1412         usb_serial_deregister(&cypress_earthmate_device);
1413 failed_em_register:
1414         return retval;
1415 }
1416
1417
1418 static void __exit cypress_exit(void)
1419 {
1420         dbg("%s", __func__);
1421
1422         usb_deregister(&cypress_driver);
1423         usb_serial_deregister(&cypress_earthmate_device);
1424         usb_serial_deregister(&cypress_hidcom_device);
1425         usb_serial_deregister(&cypress_ca42v2_device);
1426 }
1427
1428
1429 module_init(cypress_init);
1430 module_exit(cypress_exit);
1431
1432 MODULE_AUTHOR(DRIVER_AUTHOR);
1433 MODULE_DESCRIPTION(DRIVER_DESC);
1434 MODULE_VERSION(DRIVER_VERSION);
1435 MODULE_LICENSE("GPL");
1436
1437 module_param(debug, bool, S_IRUGO | S_IWUSR);
1438 MODULE_PARM_DESC(debug, "Debug enabled or not");
1439 module_param(stats, bool, S_IRUGO | S_IWUSR);
1440 MODULE_PARM_DESC(stats, "Enable statistics or not");
1441 module_param(interval, int, S_IRUGO | S_IWUSR);
1442 MODULE_PARM_DESC(interval, "Overrides interrupt interval");
1443 module_param(unstable_bauds, bool, S_IRUGO | S_IWUSR);
1444 MODULE_PARM_DESC(unstable_bauds, "Allow unstable baud rates");