Merge commit 'linus/master' into merge-linus
[linux-2.6] / 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/delay.h>
68 #include <linux/uaccess.h>
69
70 #include "cypress_m8.h"
71
72
73 #ifdef CONFIG_USB_SERIAL_DEBUG
74         static int debug = 1;
75 #else
76         static int debug;
77 #endif
78 static int stats;
79 static int interval;
80
81 /*
82  * Version Information
83  */
84 #define DRIVER_VERSION "v1.09"
85 #define DRIVER_AUTHOR "Lonnie Mendez <dignome@gmail.com>, Neil Whelchel <koyama@firstlight.net>"
86 #define DRIVER_DESC "Cypress USB to Serial Driver"
87
88 /* write buffer size defines */
89 #define CYPRESS_BUF_SIZE        1024
90 #define CYPRESS_CLOSING_WAIT    (30*HZ)
91
92 static struct usb_device_id id_table_earthmate [] = {
93         { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
94         { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
95         { }                                             /* Terminating entry */
96 };
97
98 static struct usb_device_id id_table_cyphidcomrs232 [] = {
99         { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
100         { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) },
101         { }                                             /* Terminating entry */
102 };
103
104 static struct usb_device_id id_table_nokiaca42v2 [] = {
105         { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
106         { }                                             /* Terminating entry */
107 };
108
109 static struct usb_device_id id_table_combined [] = {
110         { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
111         { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
112         { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
113         { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) },
114         { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
115         { }                                             /* Terminating entry */
116 };
117
118 MODULE_DEVICE_TABLE(usb, id_table_combined);
119
120 static struct usb_driver cypress_driver = {
121         .name =         "cypress",
122         .probe =        usb_serial_probe,
123         .disconnect =   usb_serial_disconnect,
124         .id_table =     id_table_combined,
125         .no_dynamic_id =        1,
126 };
127
128 enum packet_format {
129         packet_format_1,  /* b0:status, b1:payload count */
130         packet_format_2   /* b0[7:3]:status, b0[2:0]:payload count */
131 };
132
133 struct cypress_private {
134         spinlock_t lock;                   /* private lock */
135         int chiptype;                      /* identifier of device, for quirks/etc */
136         int bytes_in;                      /* used for statistics */
137         int bytes_out;                     /* used for statistics */
138         int cmd_count;                     /* used for statistics */
139         int cmd_ctrl;                      /* always set this to 1 before issuing a command */
140         struct cypress_buf *buf;           /* write buffer */
141         int write_urb_in_use;              /* write urb in use indicator */
142         int write_urb_interval;            /* interval to use for write urb */
143         int read_urb_interval;             /* interval to use for read urb */
144         int comm_is_ok;                    /* true if communication is (still) ok */
145         int termios_initialized;
146         __u8 line_control;                 /* holds dtr / rts value */
147         __u8 current_status;               /* received from last read - info on dsr,cts,cd,ri,etc */
148         __u8 current_config;               /* stores the current configuration byte */
149         __u8 rx_flags;                     /* throttling - used from whiteheat/ftdi_sio */
150         enum packet_format pkt_fmt;        /* format to use for packet send / receive */
151         int get_cfg_unsafe;                /* If true, the CYPRESS_GET_CONFIG is unsafe */
152         int baud_rate;                     /* stores current baud rate in
153                                               integer form */
154         int isthrottled;                   /* if throttled, discard reads */
155         wait_queue_head_t delta_msr_wait;  /* used for TIOCMIWAIT */
156         char prev_status, diff_status;     /* used for TIOCMIWAIT */
157         /* we pass a pointer to this as the arguement sent to
158            cypress_set_termios old_termios */
159         struct ktermios tmp_termios;       /* stores the old termios settings */
160 };
161
162 /* write buffer structure */
163 struct cypress_buf {
164         unsigned int    buf_size;
165         char            *buf_buf;
166         char            *buf_get;
167         char            *buf_put;
168 };
169
170 /* function prototypes for the Cypress USB to serial device */
171 static int  cypress_earthmate_startup(struct usb_serial *serial);
172 static int  cypress_hidcom_startup(struct usb_serial *serial);
173 static int  cypress_ca42v2_startup(struct usb_serial *serial);
174 static void cypress_shutdown(struct usb_serial *serial);
175 static int  cypress_open(struct tty_struct *tty,
176                         struct usb_serial_port *port, struct file *filp);
177 static void cypress_close(struct tty_struct *tty,
178                         struct usb_serial_port *port, struct file *filp);
179 static int  cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
180                         const unsigned char *buf, int count);
181 static void cypress_send(struct usb_serial_port *port);
182 static int  cypress_write_room(struct tty_struct *tty);
183 static int  cypress_ioctl(struct tty_struct *tty, struct file *file,
184                         unsigned int cmd, unsigned long arg);
185 static void cypress_set_termios(struct tty_struct *tty,
186                         struct usb_serial_port *port, struct ktermios *old);
187 static int  cypress_tiocmget(struct tty_struct *tty, struct file *file);
188 static int  cypress_tiocmset(struct tty_struct *tty, struct file *file,
189                         unsigned int set, unsigned int clear);
190 static int  cypress_chars_in_buffer(struct tty_struct *tty);
191 static void cypress_throttle(struct tty_struct *tty);
192 static void cypress_unthrottle(struct tty_struct *tty);
193 static void cypress_set_dead(struct usb_serial_port *port);
194 static void cypress_read_int_callback(struct urb *urb);
195 static void cypress_write_int_callback(struct urb *urb);
196 /* write buffer functions */
197 static struct cypress_buf *cypress_buf_alloc(unsigned int size);
198 static void cypress_buf_free(struct cypress_buf *cb);
199 static void cypress_buf_clear(struct cypress_buf *cb);
200 static unsigned int cypress_buf_data_avail(struct cypress_buf *cb);
201 static unsigned int cypress_buf_space_avail(struct cypress_buf *cb);
202 static unsigned int cypress_buf_put(struct cypress_buf *cb,
203                                         const char *buf, unsigned int count);
204 static unsigned int cypress_buf_get(struct cypress_buf *cb,
205                                         char *buf, unsigned int count);
206
207
208 static struct usb_serial_driver cypress_earthmate_device = {
209         .driver = {
210                 .owner =                THIS_MODULE,
211                 .name =                 "earthmate",
212         },
213         .description =                  "DeLorme Earthmate USB",
214         .usb_driver =                   &cypress_driver,
215         .id_table =                     id_table_earthmate,
216         .num_ports =                    1,
217         .attach =                       cypress_earthmate_startup,
218         .shutdown =                     cypress_shutdown,
219         .open =                         cypress_open,
220         .close =                        cypress_close,
221         .write =                        cypress_write,
222         .write_room =                   cypress_write_room,
223         .ioctl =                        cypress_ioctl,
224         .set_termios =                  cypress_set_termios,
225         .tiocmget =                     cypress_tiocmget,
226         .tiocmset =                     cypress_tiocmset,
227         .chars_in_buffer =              cypress_chars_in_buffer,
228         .throttle =                     cypress_throttle,
229         .unthrottle =                   cypress_unthrottle,
230         .read_int_callback =            cypress_read_int_callback,
231         .write_int_callback =           cypress_write_int_callback,
232 };
233
234 static struct usb_serial_driver cypress_hidcom_device = {
235         .driver = {
236                 .owner =                THIS_MODULE,
237                 .name =                 "cyphidcom",
238         },
239         .description =                  "HID->COM RS232 Adapter",
240         .usb_driver =                   &cypress_driver,
241         .id_table =                     id_table_cyphidcomrs232,
242         .num_ports =                    1,
243         .attach =                       cypress_hidcom_startup,
244         .shutdown =                     cypress_shutdown,
245         .open =                         cypress_open,
246         .close =                        cypress_close,
247         .write =                        cypress_write,
248         .write_room =                   cypress_write_room,
249         .ioctl =                        cypress_ioctl,
250         .set_termios =                  cypress_set_termios,
251         .tiocmget =                     cypress_tiocmget,
252         .tiocmset =                     cypress_tiocmset,
253         .chars_in_buffer =              cypress_chars_in_buffer,
254         .throttle =                     cypress_throttle,
255         .unthrottle =                   cypress_unthrottle,
256         .read_int_callback =            cypress_read_int_callback,
257         .write_int_callback =           cypress_write_int_callback,
258 };
259
260 static struct usb_serial_driver cypress_ca42v2_device = {
261         .driver = {
262                 .owner =                THIS_MODULE,
263                 .name =                 "nokiaca42v2",
264         },
265         .description =                  "Nokia CA-42 V2 Adapter",
266         .usb_driver =                   &cypress_driver,
267         .id_table =                     id_table_nokiaca42v2,
268         .num_ports =                    1,
269         .attach =                       cypress_ca42v2_startup,
270         .shutdown =                     cypress_shutdown,
271         .open =                         cypress_open,
272         .close =                        cypress_close,
273         .write =                        cypress_write,
274         .write_room =                   cypress_write_room,
275         .ioctl =                        cypress_ioctl,
276         .set_termios =                  cypress_set_termios,
277         .tiocmget =                     cypress_tiocmget,
278         .tiocmset =                     cypress_tiocmset,
279         .chars_in_buffer =              cypress_chars_in_buffer,
280         .throttle =                     cypress_throttle,
281         .unthrottle =                   cypress_unthrottle,
282         .read_int_callback =            cypress_read_int_callback,
283         .write_int_callback =           cypress_write_int_callback,
284 };
285
286 /*****************************************************************************
287  * Cypress serial helper functions
288  *****************************************************************************/
289
290
291 static int analyze_baud_rate(struct usb_serial_port *port, speed_t new_rate)
292 {
293         struct cypress_private *priv;
294         priv = usb_get_serial_port_data(port);
295
296         /*
297          * The general purpose firmware for the Cypress M8 allows for
298          * a maximum speed of 57600bps (I have no idea whether DeLorme
299          * chose to use the general purpose firmware or not), if you
300          * need to modify this speed setting for your own project
301          * please add your own chiptype and modify the code likewise.
302          * The Cypress HID->COM device will work successfully up to
303          * 115200bps (but the actual throughput is around 3kBps).
304          */
305         if (port->serial->dev->speed == USB_SPEED_LOW) {
306                 /*
307                  * Mike Isely <isely@pobox.com> 2-Feb-2008: The
308                  * Cypress app note that describes this mechanism
309                  * states the the low-speed part can't handle more
310                  * than 800 bytes/sec, in which case 4800 baud is the
311                  * safest speed for a part like that.
312                  */
313                 if (new_rate > 4800) {
314                         dbg("%s - failed setting baud rate, device incapable "
315                             "speed %d", __func__, new_rate);
316                         return -1;
317                 }
318         }
319         switch (priv->chiptype) {
320         case CT_EARTHMATE:
321                 if (new_rate <= 600) {
322                         /* 300 and 600 baud rates are supported under
323                          * the generic firmware, but are not used with
324                          * NMEA and SiRF protocols */
325                         dbg("%s - failed setting baud rate, unsupported speed "
326                             "of %d on Earthmate GPS", __func__, new_rate);
327                         return -1;
328                 }
329                 break;
330         default:
331                 break;
332         }
333         return new_rate;
334 }
335
336
337 /* This function can either set or retrieve the current serial line settings */
338 static int cypress_serial_control(struct tty_struct *tty,
339         struct usb_serial_port *port, speed_t baud_rate, int data_bits,
340         int stop_bits, int parity_enable, int parity_type, int reset,
341         int cypress_request_type)
342 {
343         int new_baudrate = 0, retval = 0, tries = 0;
344         struct cypress_private *priv;
345         __u8 feature_buffer[5];
346         unsigned long flags;
347
348         dbg("%s", __func__);
349
350         priv = usb_get_serial_port_data(port);
351
352         if (!priv->comm_is_ok)
353                 return -ENODEV;
354
355         switch (cypress_request_type) {
356         case CYPRESS_SET_CONFIG:
357                 new_baudrate = priv->baud_rate;
358                 /* 0 means 'Hang up' so doesn't change the true bit rate */
359                 if (baud_rate == 0)
360                         new_baudrate = priv->baud_rate;
361                 /* Change of speed ? */
362                 else if (baud_rate != priv->baud_rate) {
363                         dbg("%s - baud rate is changing", __func__);
364                         retval = analyze_baud_rate(port, baud_rate);
365                         if (retval >=  0) {
366                                 new_baudrate = retval;
367                                 dbg("%s - New baud rate set to %d",
368                                     __func__, new_baudrate);
369                         }
370                 }
371                 dbg("%s - baud rate is being sent as %d",
372                                         __func__, new_baudrate);
373
374                 memset(feature_buffer, 0, sizeof(feature_buffer));
375                 /* fill the feature_buffer with new configuration */
376                 *((u_int32_t *)feature_buffer) = new_baudrate;
377                 feature_buffer[4] |= data_bits;   /* assign data bits in 2 bit space ( max 3 ) */
378                 /* 1 bit gap */
379                 feature_buffer[4] |= (stop_bits << 3);   /* assign stop bits in 1 bit space */
380                 feature_buffer[4] |= (parity_enable << 4);   /* assign parity flag in 1 bit space */
381                 feature_buffer[4] |= (parity_type << 5);   /* assign parity type in 1 bit space */
382                 /* 1 bit gap */
383                 feature_buffer[4] |= (reset << 7);   /* assign reset at end of byte, 1 bit space */
384
385                 dbg("%s - device is being sent this feature report:",
386                                                                 __func__);
387                 dbg("%s - %02X - %02X - %02X - %02X - %02X", __func__,
388                         feature_buffer[0], feature_buffer[1],
389                         feature_buffer[2], feature_buffer[3],
390                         feature_buffer[4]);
391
392                 do {
393                         retval = usb_control_msg(port->serial->dev,
394                                         usb_sndctrlpipe(port->serial->dev, 0),
395                                         HID_REQ_SET_REPORT,
396                                         USB_DIR_OUT | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
397                                         0x0300, 0, feature_buffer,
398                                         sizeof(feature_buffer), 500);
399
400                         if (tries++ >= 3)
401                                 break;
402
403                 } while (retval != sizeof(feature_buffer) &&
404                          retval != -ENODEV);
405
406                 if (retval != sizeof(feature_buffer)) {
407                         err("%s - failed sending serial line settings - %d",
408                                                         __func__, retval);
409                         cypress_set_dead(port);
410                 } else {
411                         spin_lock_irqsave(&priv->lock, flags);
412                         priv->baud_rate = new_baudrate;
413                         priv->current_config = feature_buffer[4];
414                         spin_unlock_irqrestore(&priv->lock, flags);
415                         /* If we asked for a speed change encode it */
416                         if (baud_rate)
417                                 tty_encode_baud_rate(tty,
418                                         new_baudrate, new_baudrate);
419                 }
420         break;
421         case CYPRESS_GET_CONFIG:
422                 if (priv->get_cfg_unsafe) {
423                         /* Not implemented for this device,
424                            and if we try to do it we're likely
425                            to crash the hardware. */
426                         return -ENOTTY;
427                 }
428                 dbg("%s - retreiving serial line settings", __func__);
429                 /* set initial values in feature buffer */
430                 memset(feature_buffer, 0, sizeof(feature_buffer));
431
432                 do {
433                         retval = usb_control_msg(port->serial->dev,
434                                         usb_rcvctrlpipe(port->serial->dev, 0),
435                                         HID_REQ_GET_REPORT,
436                                         USB_DIR_IN | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
437                                         0x0300, 0, feature_buffer,
438                                         sizeof(feature_buffer), 500);
439
440                         if (tries++ >= 3)
441                                 break;
442                 } while (retval != sizeof(feature_buffer)
443                                                 && retval != -ENODEV);
444
445                 if (retval != sizeof(feature_buffer)) {
446                         err("%s - failed to retrieve serial line settings - %d", __func__, retval);
447                         cypress_set_dead(port);
448                         return retval;
449                 } else {
450                         spin_lock_irqsave(&priv->lock, flags);
451                         /* store the config in one byte, and later
452                            use bit masks to check values */
453                         priv->current_config = feature_buffer[4];
454                         priv->baud_rate = *((u_int32_t *)feature_buffer);
455                         spin_unlock_irqrestore(&priv->lock, flags);
456                 }
457         }
458         spin_lock_irqsave(&priv->lock, flags);
459         ++priv->cmd_count;
460         spin_unlock_irqrestore(&priv->lock, flags);
461
462         return retval;
463 } /* cypress_serial_control */
464
465
466 static void cypress_set_dead(struct usb_serial_port *port)
467 {
468         struct cypress_private *priv = usb_get_serial_port_data(port);
469         unsigned long flags;
470
471         spin_lock_irqsave(&priv->lock, flags);
472         if (!priv->comm_is_ok) {
473                 spin_unlock_irqrestore(&priv->lock, flags);
474                 return;
475         }
476         priv->comm_is_ok = 0;
477         spin_unlock_irqrestore(&priv->lock, flags);
478
479         err("cypress_m8 suspending failing port %d - interval might be too short",
480             port->number);
481 }
482
483
484 /*****************************************************************************
485  * Cypress serial driver functions
486  *****************************************************************************/
487
488
489 static int generic_startup(struct usb_serial *serial)
490 {
491         struct cypress_private *priv;
492         struct usb_serial_port *port = serial->port[0];
493
494         dbg("%s - port %d", __func__, port->number);
495
496         priv = kzalloc(sizeof(struct cypress_private), GFP_KERNEL);
497         if (!priv)
498                 return -ENOMEM;
499
500         priv->comm_is_ok = !0;
501         spin_lock_init(&priv->lock);
502         priv->buf = cypress_buf_alloc(CYPRESS_BUF_SIZE);
503         if (priv->buf == NULL) {
504                 kfree(priv);
505                 return -ENOMEM;
506         }
507         init_waitqueue_head(&priv->delta_msr_wait);
508
509         usb_reset_configuration(serial->dev);
510
511         priv->cmd_ctrl = 0;
512         priv->line_control = 0;
513         priv->termios_initialized = 0;
514         priv->rx_flags = 0;
515         /* Default packet format setting is determined by packet size.
516            Anything with a size larger then 9 must have a separate
517            count field since the 3 bit count field is otherwise too
518            small.  Otherwise we can use the slightly more compact
519            format.  This is in accordance with the cypress_m8 serial
520            converter app note. */
521         if (port->interrupt_out_size > 9)
522                 priv->pkt_fmt = packet_format_1;
523         else
524                 priv->pkt_fmt = packet_format_2;
525
526         if (interval > 0) {
527                 priv->write_urb_interval = interval;
528                 priv->read_urb_interval = interval;
529                 dbg("%s - port %d read & write intervals forced to %d",
530                     __func__, port->number, interval);
531         } else {
532                 priv->write_urb_interval = port->interrupt_out_urb->interval;
533                 priv->read_urb_interval = port->interrupt_in_urb->interval;
534                 dbg("%s - port %d intervals: read=%d write=%d",
535                     __func__, port->number,
536                     priv->read_urb_interval, priv->write_urb_interval);
537         }
538         usb_set_serial_port_data(port, priv);
539
540         return 0;
541 }
542
543
544 static int cypress_earthmate_startup(struct usb_serial *serial)
545 {
546         struct cypress_private *priv;
547         struct usb_serial_port *port = serial->port[0];
548
549         dbg("%s", __func__);
550
551         if (generic_startup(serial)) {
552                 dbg("%s - Failed setting up port %d", __func__,
553                                 port->number);
554                 return 1;
555         }
556
557         priv = usb_get_serial_port_data(port);
558         priv->chiptype = CT_EARTHMATE;
559         /* All Earthmate devices use the separated-count packet
560            format!  Idiotic. */
561         priv->pkt_fmt = packet_format_1;
562         if (serial->dev->descriptor.idProduct !=
563                                 cpu_to_le16(PRODUCT_ID_EARTHMATEUSB)) {
564                 /* The old original USB Earthmate seemed able to
565                    handle GET_CONFIG requests; everything they've
566                    produced since that time crashes if this command is
567                    attempted :-( */
568                 dbg("%s - Marking this device as unsafe for GET_CONFIG "
569                     "commands", __func__);
570                 priv->get_cfg_unsafe = !0;
571         }
572
573         return 0;
574 } /* cypress_earthmate_startup */
575
576
577 static int cypress_hidcom_startup(struct usb_serial *serial)
578 {
579         struct cypress_private *priv;
580
581         dbg("%s", __func__);
582
583         if (generic_startup(serial)) {
584                 dbg("%s - Failed setting up port %d", __func__,
585                                 serial->port[0]->number);
586                 return 1;
587         }
588
589         priv = usb_get_serial_port_data(serial->port[0]);
590         priv->chiptype = CT_CYPHIDCOM;
591
592         return 0;
593 } /* cypress_hidcom_startup */
594
595
596 static int cypress_ca42v2_startup(struct usb_serial *serial)
597 {
598         struct cypress_private *priv;
599
600         dbg("%s", __func__);
601
602         if (generic_startup(serial)) {
603                 dbg("%s - Failed setting up port %d", __func__,
604                                 serial->port[0]->number);
605                 return 1;
606         }
607
608         priv = usb_get_serial_port_data(serial->port[0]);
609         priv->chiptype = CT_CA42V2;
610
611         return 0;
612 } /* cypress_ca42v2_startup */
613
614
615 static void cypress_shutdown(struct usb_serial *serial)
616 {
617         struct cypress_private *priv;
618
619         dbg("%s - port %d", __func__, serial->port[0]->number);
620
621         /* all open ports are closed at this point */
622
623         priv = usb_get_serial_port_data(serial->port[0]);
624
625         if (priv) {
626                 cypress_buf_free(priv->buf);
627                 kfree(priv);
628                 usb_set_serial_port_data(serial->port[0], NULL);
629         }
630 }
631
632
633 static int cypress_open(struct tty_struct *tty,
634                         struct usb_serial_port *port, struct file *filp)
635 {
636         struct cypress_private *priv = usb_get_serial_port_data(port);
637         struct usb_serial *serial = port->serial;
638         unsigned long flags;
639         int result = 0;
640
641         dbg("%s - port %d", __func__, port->number);
642
643         if (!priv->comm_is_ok)
644                 return -EIO;
645
646         /* clear halts before open */
647         usb_clear_halt(serial->dev, 0x81);
648         usb_clear_halt(serial->dev, 0x02);
649
650         spin_lock_irqsave(&priv->lock, flags);
651         /* reset read/write statistics */
652         priv->bytes_in = 0;
653         priv->bytes_out = 0;
654         priv->cmd_count = 0;
655         priv->rx_flags = 0;
656         spin_unlock_irqrestore(&priv->lock, flags);
657
658         /* setting to zero could cause data loss */
659         if (tty)
660                 tty->low_latency = 1;
661
662         /* raise both lines and set termios */
663         spin_lock_irqsave(&priv->lock, flags);
664         priv->line_control = CONTROL_DTR | CONTROL_RTS;
665         priv->cmd_ctrl = 1;
666         spin_unlock_irqrestore(&priv->lock, flags);
667         result = cypress_write(tty, port, NULL, 0);
668
669         if (result) {
670                 dev_err(&port->dev,
671                         "%s - failed setting the control lines - error %d\n",
672                                                         __func__, result);
673                 return result;
674         } else
675                 dbg("%s - success setting the control lines", __func__);
676
677         if (tty)
678                 cypress_set_termios(tty, port, &priv->tmp_termios);
679
680         /* setup the port and start reading from the device */
681         if (!port->interrupt_in_urb) {
682                 err("%s - interrupt_in_urb is empty!", __func__);
683                 return -1;
684         }
685
686         usb_fill_int_urb(port->interrupt_in_urb, serial->dev,
687                 usb_rcvintpipe(serial->dev, port->interrupt_in_endpointAddress),
688                 port->interrupt_in_urb->transfer_buffer,
689                 port->interrupt_in_urb->transfer_buffer_length,
690                 cypress_read_int_callback, port, priv->read_urb_interval);
691         result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
692
693         if (result) {
694                 dev_err(&port->dev,
695                         "%s - failed submitting read urb, error %d\n",
696                                                         __func__, result);
697                 cypress_set_dead(port);
698         }
699
700         return result;
701 } /* cypress_open */
702
703
704 static void cypress_close(struct tty_struct *tty,
705                         struct usb_serial_port *port, struct file *filp)
706 {
707         struct cypress_private *priv = usb_get_serial_port_data(port);
708         unsigned int c_cflag;
709         int bps;
710         long timeout;
711         wait_queue_t wait;
712
713         dbg("%s - port %d", __func__, port->number);
714
715         /* wait for data to drain from buffer */
716         spin_lock_irq(&priv->lock);
717         timeout = CYPRESS_CLOSING_WAIT;
718         init_waitqueue_entry(&wait, current);
719         add_wait_queue(&tty->write_wait, &wait);
720         for (;;) {
721                 set_current_state(TASK_INTERRUPTIBLE);
722                 if (cypress_buf_data_avail(priv->buf) == 0
723                 || timeout == 0 || signal_pending(current)
724                 /* without mutex, allowed due to harmless failure mode */
725                 || port->serial->disconnected)
726                         break;
727                 spin_unlock_irq(&priv->lock);
728                 timeout = schedule_timeout(timeout);
729                 spin_lock_irq(&priv->lock);
730         }
731         set_current_state(TASK_RUNNING);
732         remove_wait_queue(&tty->write_wait, &wait);
733         /* clear out any remaining data in the buffer */
734         cypress_buf_clear(priv->buf);
735         spin_unlock_irq(&priv->lock);
736
737         /* writing is potentially harmful, lock must be taken */
738         mutex_lock(&port->serial->disc_mutex);
739         if (port->serial->disconnected) {
740                 mutex_unlock(&port->serial->disc_mutex);
741                 return;
742         }
743         /* wait for characters to drain from device */
744         if (tty) {
745                 bps = tty_get_baud_rate(tty);
746                 if (bps > 1200)
747                         timeout = max((HZ * 2560) / bps, HZ / 10);
748                 else
749                         timeout = 2 * HZ;
750                 schedule_timeout_interruptible(timeout);
751         }
752
753         dbg("%s - stopping urbs", __func__);
754         usb_kill_urb(port->interrupt_in_urb);
755         usb_kill_urb(port->interrupt_out_urb);
756
757         if (tty) {
758                 c_cflag = tty->termios->c_cflag;
759                 if (c_cflag & HUPCL) {
760                         /* drop dtr and rts */
761                         priv = usb_get_serial_port_data(port);
762                         spin_lock_irq(&priv->lock);
763                         priv->line_control = 0;
764                         priv->cmd_ctrl = 1;
765                         spin_unlock_irq(&priv->lock);
766                         cypress_write(tty, port, NULL, 0);
767                 }
768         }
769
770         if (stats)
771                 dev_info(&port->dev, "Statistics: %d Bytes In | %d Bytes Out | %d Commands Issued\n",
772                         priv->bytes_in, priv->bytes_out, priv->cmd_count);
773         mutex_unlock(&port->serial->disc_mutex);
774 } /* cypress_close */
775
776
777 static int cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
778                                         const unsigned char *buf, int count)
779 {
780         struct cypress_private *priv = usb_get_serial_port_data(port);
781         unsigned long flags;
782
783         dbg("%s - port %d, %d bytes", __func__, port->number, count);
784
785         /* line control commands, which need to be executed immediately,
786            are not put into the buffer for obvious reasons.
787          */
788         if (priv->cmd_ctrl) {
789                 count = 0;
790                 goto finish;
791         }
792
793         if (!count)
794                 return count;
795
796         spin_lock_irqsave(&priv->lock, flags);
797         count = cypress_buf_put(priv->buf, buf, count);
798         spin_unlock_irqrestore(&priv->lock, flags);
799
800 finish:
801         cypress_send(port);
802
803         return count;
804 } /* cypress_write */
805
806
807 static void cypress_send(struct usb_serial_port *port)
808 {
809         int count = 0, result, offset, actual_size;
810         struct cypress_private *priv = usb_get_serial_port_data(port);
811         unsigned long flags;
812
813         if (!priv->comm_is_ok)
814                 return;
815
816         dbg("%s - port %d", __func__, port->number);
817         dbg("%s - interrupt out size is %d", __func__,
818                                                 port->interrupt_out_size);
819
820         spin_lock_irqsave(&priv->lock, flags);
821         if (priv->write_urb_in_use) {
822                 dbg("%s - can't write, urb in use", __func__);
823                 spin_unlock_irqrestore(&priv->lock, flags);
824                 return;
825         }
826         spin_unlock_irqrestore(&priv->lock, flags);
827
828         /* clear buffer */
829         memset(port->interrupt_out_urb->transfer_buffer, 0,
830                                                 port->interrupt_out_size);
831
832         spin_lock_irqsave(&priv->lock, flags);
833         switch (priv->pkt_fmt) {
834         default:
835         case packet_format_1:
836                 /* this is for the CY7C64013... */
837                 offset = 2;
838                 port->interrupt_out_buffer[0] = priv->line_control;
839                 break;
840         case packet_format_2:
841                 /* this is for the CY7C63743... */
842                 offset = 1;
843                 port->interrupt_out_buffer[0] = priv->line_control;
844                 break;
845         }
846
847         if (priv->line_control & CONTROL_RESET)
848                 priv->line_control &= ~CONTROL_RESET;
849
850         if (priv->cmd_ctrl) {
851                 priv->cmd_count++;
852                 dbg("%s - line control command being issued", __func__);
853                 spin_unlock_irqrestore(&priv->lock, flags);
854                 goto send;
855         } else
856                 spin_unlock_irqrestore(&priv->lock, flags);
857
858         count = cypress_buf_get(priv->buf, &port->interrupt_out_buffer[offset],
859                                 port->interrupt_out_size-offset);
860
861         if (count == 0)
862                 return;
863
864         switch (priv->pkt_fmt) {
865         default:
866         case packet_format_1:
867                 port->interrupt_out_buffer[1] = count;
868                 break;
869         case packet_format_2:
870                 port->interrupt_out_buffer[0] |= count;
871         }
872
873         dbg("%s - count is %d", __func__, count);
874
875 send:
876         spin_lock_irqsave(&priv->lock, flags);
877         priv->write_urb_in_use = 1;
878         spin_unlock_irqrestore(&priv->lock, flags);
879
880         if (priv->cmd_ctrl)
881                 actual_size = 1;
882         else
883                 actual_size = count +
884                               (priv->pkt_fmt == packet_format_1 ? 2 : 1);
885
886         usb_serial_debug_data(debug, &port->dev, __func__,
887                 port->interrupt_out_size,
888                 port->interrupt_out_urb->transfer_buffer);
889
890         usb_fill_int_urb(port->interrupt_out_urb, port->serial->dev,
891                 usb_sndintpipe(port->serial->dev, port->interrupt_out_endpointAddress),
892                 port->interrupt_out_buffer, port->interrupt_out_size,
893                 cypress_write_int_callback, port, priv->write_urb_interval);
894         result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC);
895         if (result) {
896                 dev_err(&port->dev,
897                                 "%s - failed submitting write urb, error %d\n",
898                                                         __func__, result);
899                 priv->write_urb_in_use = 0;
900                 cypress_set_dead(port);
901         }
902
903         spin_lock_irqsave(&priv->lock, flags);
904         if (priv->cmd_ctrl)
905                 priv->cmd_ctrl = 0;
906
907         /* do not count the line control and size bytes */
908         priv->bytes_out += count;
909         spin_unlock_irqrestore(&priv->lock, flags);
910
911         usb_serial_port_softint(port);
912 } /* cypress_send */
913
914
915 /* returns how much space is available in the soft buffer */
916 static int cypress_write_room(struct tty_struct *tty)
917 {
918         struct usb_serial_port *port = tty->driver_data;
919         struct cypress_private *priv = usb_get_serial_port_data(port);
920         int room = 0;
921         unsigned long flags;
922
923         dbg("%s - port %d", __func__, port->number);
924
925         spin_lock_irqsave(&priv->lock, flags);
926         room = cypress_buf_space_avail(priv->buf);
927         spin_unlock_irqrestore(&priv->lock, flags);
928
929         dbg("%s - returns %d", __func__, room);
930         return room;
931 }
932
933
934 static int cypress_tiocmget(struct tty_struct *tty, struct file *file)
935 {
936         struct usb_serial_port *port = tty->driver_data;
937         struct cypress_private *priv = usb_get_serial_port_data(port);
938         __u8 status, control;
939         unsigned int result = 0;
940         unsigned long flags;
941
942         dbg("%s - port %d", __func__, port->number);
943
944         spin_lock_irqsave(&priv->lock, flags);
945         control = priv->line_control;
946         status = priv->current_status;
947         spin_unlock_irqrestore(&priv->lock, flags);
948
949         result = ((control & CONTROL_DTR)        ? TIOCM_DTR : 0)
950                 | ((control & CONTROL_RTS)       ? TIOCM_RTS : 0)
951                 | ((status & UART_CTS)        ? TIOCM_CTS : 0)
952                 | ((status & UART_DSR)        ? TIOCM_DSR : 0)
953                 | ((status & UART_RI)         ? TIOCM_RI  : 0)
954                 | ((status & UART_CD)         ? TIOCM_CD  : 0);
955
956         dbg("%s - result = %x", __func__, result);
957
958         return result;
959 }
960
961
962 static int cypress_tiocmset(struct tty_struct *tty, struct file *file,
963                                unsigned int set, unsigned int clear)
964 {
965         struct usb_serial_port *port = tty->driver_data;
966         struct cypress_private *priv = usb_get_serial_port_data(port);
967         unsigned long flags;
968
969         dbg("%s - port %d", __func__, port->number);
970
971         spin_lock_irqsave(&priv->lock, flags);
972         if (set & TIOCM_RTS)
973                 priv->line_control |= CONTROL_RTS;
974         if (set & TIOCM_DTR)
975                 priv->line_control |= CONTROL_DTR;
976         if (clear & TIOCM_RTS)
977                 priv->line_control &= ~CONTROL_RTS;
978         if (clear & TIOCM_DTR)
979                 priv->line_control &= ~CONTROL_DTR;
980         priv->cmd_ctrl = 1;
981         spin_unlock_irqrestore(&priv->lock, flags);
982
983         return cypress_write(tty, port, NULL, 0);
984 }
985
986
987 static int cypress_ioctl(struct tty_struct *tty, struct file *file,
988                                         unsigned int cmd, unsigned long arg)
989 {
990         struct usb_serial_port *port = tty->driver_data;
991         struct cypress_private *priv = usb_get_serial_port_data(port);
992
993         dbg("%s - port %d, cmd 0x%.4x", __func__, port->number, cmd);
994
995         switch (cmd) {
996         /* This code comes from drivers/char/serial.c and ftdi_sio.c */
997         case TIOCMIWAIT:
998                 while (priv != NULL) {
999                         interruptible_sleep_on(&priv->delta_msr_wait);
1000                         /* see if a signal did it */
1001                         if (signal_pending(current))
1002                                 return -ERESTARTSYS;
1003                         else {
1004                                 char diff = priv->diff_status;
1005                                 if (diff == 0)
1006                                         return -EIO; /* no change => error */
1007
1008                                 /* consume all events */
1009                                 priv->diff_status = 0;
1010
1011                                 /* return 0 if caller wanted to know about
1012                                    these bits */
1013                                 if (((arg & TIOCM_RNG) && (diff & UART_RI)) ||
1014                                     ((arg & TIOCM_DSR) && (diff & UART_DSR)) ||
1015                                     ((arg & TIOCM_CD) && (diff & UART_CD)) ||
1016                                     ((arg & TIOCM_CTS) && (diff & UART_CTS)))
1017                                         return 0;
1018                                 /* otherwise caller can't care less about what
1019                                  * happened, and so we continue to wait for
1020                                  * more events.
1021                                  */
1022                         }
1023                 }
1024                 return 0;
1025         default:
1026                 break;
1027         }
1028         dbg("%s - arg not supported - it was 0x%04x - check include/asm/ioctls.h", __func__, cmd);
1029         return -ENOIOCTLCMD;
1030 } /* cypress_ioctl */
1031
1032
1033 static void cypress_set_termios(struct tty_struct *tty,
1034         struct usb_serial_port *port, struct ktermios *old_termios)
1035 {
1036         struct cypress_private *priv = usb_get_serial_port_data(port);
1037         int data_bits, stop_bits, parity_type, parity_enable;
1038         unsigned cflag, iflag;
1039         unsigned long flags;
1040         __u8 oldlines;
1041         int linechange = 0;
1042
1043         dbg("%s - port %d", __func__, port->number);
1044
1045         spin_lock_irqsave(&priv->lock, flags);
1046         if (!priv->termios_initialized) {
1047                 if (priv->chiptype == CT_EARTHMATE) {
1048                         *(tty->termios) = tty_std_termios;
1049                         tty->termios->c_cflag = B4800 | CS8 | CREAD | HUPCL |
1050                                 CLOCAL;
1051                         tty->termios->c_ispeed = 4800;
1052                         tty->termios->c_ospeed = 4800;
1053                 } else if (priv->chiptype == CT_CYPHIDCOM) {
1054                         *(tty->termios) = tty_std_termios;
1055                         tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL |
1056                                 CLOCAL;
1057                         tty->termios->c_ispeed = 9600;
1058                         tty->termios->c_ospeed = 9600;
1059                 } else if (priv->chiptype == CT_CA42V2) {
1060                         *(tty->termios) = tty_std_termios;
1061                         tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL |
1062                                 CLOCAL;
1063                         tty->termios->c_ispeed = 9600;
1064                         tty->termios->c_ospeed = 9600;
1065                 }
1066                 priv->termios_initialized = 1;
1067         }
1068         spin_unlock_irqrestore(&priv->lock, flags);
1069
1070         /* Unsupported features need clearing */
1071         tty->termios->c_cflag &= ~(CMSPAR|CRTSCTS);
1072
1073         cflag = tty->termios->c_cflag;
1074         iflag = tty->termios->c_iflag;
1075
1076         /* check if there are new settings */
1077         if (old_termios) {
1078                 spin_lock_irqsave(&priv->lock, flags);
1079                 priv->tmp_termios = *(tty->termios);
1080                 spin_unlock_irqrestore(&priv->lock, flags);
1081         }
1082
1083         /* set number of data bits, parity, stop bits */
1084         /* when parity is disabled the parity type bit is ignored */
1085
1086         /* 1 means 2 stop bits, 0 means 1 stop bit */
1087         stop_bits = cflag & CSTOPB ? 1 : 0;
1088
1089         if (cflag & PARENB) {
1090                 parity_enable = 1;
1091                 /* 1 means odd parity, 0 means even parity */
1092                 parity_type = cflag & PARODD ? 1 : 0;
1093         } else
1094                 parity_enable = parity_type = 0;
1095
1096         switch (cflag & CSIZE) {
1097         case CS5:
1098                 data_bits = 0;
1099                 break;
1100         case CS6:
1101                 data_bits = 1;
1102                 break;
1103         case CS7:
1104                 data_bits = 2;
1105                 break;
1106         case CS8:
1107                 data_bits = 3;
1108                 break;
1109         default:
1110                 err("%s - CSIZE was set, but not CS5-CS8",
1111                                 __func__);
1112                 data_bits = 3;
1113         }
1114         spin_lock_irqsave(&priv->lock, flags);
1115         oldlines = priv->line_control;
1116         if ((cflag & CBAUD) == B0) {
1117                 /* drop dtr and rts */
1118                 dbg("%s - dropping the lines, baud rate 0bps", __func__);
1119                 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
1120         } else
1121                 priv->line_control = (CONTROL_DTR | CONTROL_RTS);
1122         spin_unlock_irqrestore(&priv->lock, flags);
1123
1124         dbg("%s - sending %d stop_bits, %d parity_enable, %d parity_type, "
1125                         "%d data_bits (+5)", __func__, stop_bits,
1126                         parity_enable, parity_type, data_bits);
1127
1128         cypress_serial_control(tty, port, tty_get_baud_rate(tty),
1129                         data_bits, stop_bits,
1130                         parity_enable, parity_type,
1131                         0, CYPRESS_SET_CONFIG);
1132
1133         /* we perform a CYPRESS_GET_CONFIG so that the current settings are
1134          * filled into the private structure this should confirm that all is
1135          * working if it returns what we just set */
1136         cypress_serial_control(tty, port, 0, 0, 0, 0, 0, 0, CYPRESS_GET_CONFIG);
1137
1138         /* Here we can define custom tty settings for devices; the main tty
1139          * termios flag base comes from empeg.c */
1140
1141         spin_lock_irqsave(&priv->lock, flags);
1142         if (priv->chiptype == CT_EARTHMATE && priv->baud_rate == 4800) {
1143                 dbg("Using custom termios settings for a baud rate of "
1144                                 "4800bps.");
1145                 /* define custom termios settings for NMEA protocol */
1146
1147                 tty->termios->c_iflag /* input modes - */
1148                         &= ~(IGNBRK  /* disable ignore break */
1149                         | BRKINT     /* disable break causes interrupt */
1150                         | PARMRK     /* disable mark parity errors */
1151                         | ISTRIP     /* disable clear high bit of input char */
1152                         | INLCR      /* disable translate NL to CR */
1153                         | IGNCR      /* disable ignore CR */
1154                         | ICRNL      /* disable translate CR to NL */
1155                         | IXON);     /* disable enable XON/XOFF flow control */
1156
1157                 tty->termios->c_oflag /* output modes */
1158                         &= ~OPOST;    /* disable postprocess output char */
1159
1160                 tty->termios->c_lflag /* line discipline modes */
1161                         &= ~(ECHO     /* disable echo input characters */
1162                         | ECHONL      /* disable echo new line */
1163                         | ICANON      /* disable erase, kill, werase, and rprnt
1164                                          special characters */
1165                         | ISIG        /* disable interrupt, quit, and suspend
1166                                          special characters */
1167                         | IEXTEN);    /* disable non-POSIX special characters */
1168         } /* CT_CYPHIDCOM: Application should handle this for device */
1169
1170         linechange = (priv->line_control != oldlines);
1171         spin_unlock_irqrestore(&priv->lock, flags);
1172
1173         /* if necessary, set lines */
1174         if (linechange) {
1175                 priv->cmd_ctrl = 1;
1176                 cypress_write(tty, port, NULL, 0);
1177         }
1178 } /* cypress_set_termios */
1179
1180
1181 /* returns amount of data still left in soft buffer */
1182 static int cypress_chars_in_buffer(struct tty_struct *tty)
1183 {
1184         struct usb_serial_port *port = tty->driver_data;
1185         struct cypress_private *priv = usb_get_serial_port_data(port);
1186         int chars = 0;
1187         unsigned long flags;
1188
1189         dbg("%s - port %d", __func__, port->number);
1190
1191         spin_lock_irqsave(&priv->lock, flags);
1192         chars = cypress_buf_data_avail(priv->buf);
1193         spin_unlock_irqrestore(&priv->lock, flags);
1194
1195         dbg("%s - returns %d", __func__, chars);
1196         return chars;
1197 }
1198
1199
1200 static void cypress_throttle(struct tty_struct *tty)
1201 {
1202         struct usb_serial_port *port = tty->driver_data;
1203         struct cypress_private *priv = usb_get_serial_port_data(port);
1204         unsigned long flags;
1205
1206         dbg("%s - port %d", __func__, port->number);
1207
1208         spin_lock_irqsave(&priv->lock, flags);
1209         priv->rx_flags = THROTTLED;
1210         spin_unlock_irqrestore(&priv->lock, flags);
1211 }
1212
1213
1214 static void cypress_unthrottle(struct tty_struct *tty)
1215 {
1216         struct usb_serial_port *port = tty->driver_data;
1217         struct cypress_private *priv = usb_get_serial_port_data(port);
1218         int actually_throttled, result;
1219         unsigned long flags;
1220
1221         dbg("%s - port %d", __func__, port->number);
1222
1223         spin_lock_irqsave(&priv->lock, flags);
1224         actually_throttled = priv->rx_flags & ACTUALLY_THROTTLED;
1225         priv->rx_flags = 0;
1226         spin_unlock_irqrestore(&priv->lock, flags);
1227
1228         if (!priv->comm_is_ok)
1229                 return;
1230
1231         if (actually_throttled) {
1232                 port->interrupt_in_urb->dev = port->serial->dev;
1233
1234                 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
1235                 if (result) {
1236                         dev_err(&port->dev, "%s - failed submitting read urb, "
1237                                         "error %d\n", __func__, result);
1238                         cypress_set_dead(port);
1239                 }
1240         }
1241 }
1242
1243
1244 static void cypress_read_int_callback(struct urb *urb)
1245 {
1246         struct usb_serial_port *port = urb->context;
1247         struct cypress_private *priv = usb_get_serial_port_data(port);
1248         struct tty_struct *tty;
1249         unsigned char *data = urb->transfer_buffer;
1250         unsigned long flags;
1251         char tty_flag = TTY_NORMAL;
1252         int havedata = 0;
1253         int bytes = 0;
1254         int result;
1255         int i = 0;
1256         int status = urb->status;
1257
1258         dbg("%s - port %d", __func__, port->number);
1259
1260         switch (status) {
1261         case 0: /* success */
1262                 break;
1263         case -ECONNRESET:
1264         case -ENOENT:
1265         case -ESHUTDOWN:
1266                 /* precursor to disconnect so just go away */
1267                 return;
1268         case -EPIPE:
1269                 usb_clear_halt(port->serial->dev, 0x81);
1270                 break;
1271         default:
1272                 /* something ugly is going on... */
1273                 dev_err(&urb->dev->dev,
1274                         "%s - unexpected nonzero read status received: %d\n",
1275                                                         __func__, status);
1276                 cypress_set_dead(port);
1277                 return;
1278         }
1279
1280         spin_lock_irqsave(&priv->lock, flags);
1281         if (priv->rx_flags & THROTTLED) {
1282                 dbg("%s - now throttling", __func__);
1283                 priv->rx_flags |= ACTUALLY_THROTTLED;
1284                 spin_unlock_irqrestore(&priv->lock, flags);
1285                 return;
1286         }
1287         spin_unlock_irqrestore(&priv->lock, flags);
1288
1289         tty = tty_port_tty_get(&port->port);
1290         if (!tty) {
1291                 dbg("%s - bad tty pointer - exiting", __func__);
1292                 return;
1293         }
1294
1295         spin_lock_irqsave(&priv->lock, flags);
1296         result = urb->actual_length;
1297         switch (priv->pkt_fmt) {
1298         default:
1299         case packet_format_1:
1300                 /* This is for the CY7C64013... */
1301                 priv->current_status = data[0] & 0xF8;
1302                 bytes = data[1] + 2;
1303                 i = 2;
1304                 if (bytes > 2)
1305                         havedata = 1;
1306                 break;
1307         case packet_format_2:
1308                 /* This is for the CY7C63743... */
1309                 priv->current_status = data[0] & 0xF8;
1310                 bytes = (data[0] & 0x07) + 1;
1311                 i = 1;
1312                 if (bytes > 1)
1313                         havedata = 1;
1314                 break;
1315         }
1316         spin_unlock_irqrestore(&priv->lock, flags);
1317         if (result < bytes) {
1318                 dbg("%s - wrong packet size - received %d bytes but packet "
1319                     "said %d bytes", __func__, result, bytes);
1320                 goto continue_read;
1321         }
1322
1323         usb_serial_debug_data(debug, &port->dev, __func__,
1324                                                 urb->actual_length, data);
1325
1326         spin_lock_irqsave(&priv->lock, flags);
1327         /* check to see if status has changed */
1328         if (priv->current_status != priv->prev_status) {
1329                 priv->diff_status |= priv->current_status ^
1330                         priv->prev_status;
1331                 wake_up_interruptible(&priv->delta_msr_wait);
1332                 priv->prev_status = priv->current_status;
1333         }
1334         spin_unlock_irqrestore(&priv->lock, flags);
1335
1336         /* hangup, as defined in acm.c... this might be a bad place for it
1337          * though */
1338         if (tty && !(tty->termios->c_cflag & CLOCAL) &&
1339                         !(priv->current_status & UART_CD)) {
1340                 dbg("%s - calling hangup", __func__);
1341                 tty_hangup(tty);
1342                 goto continue_read;
1343         }
1344
1345         /* There is one error bit... I'm assuming it is a parity error
1346          * indicator as the generic firmware will set this bit to 1 if a
1347          * parity error occurs.
1348          * I can not find reference to any other error events. */
1349         spin_lock_irqsave(&priv->lock, flags);
1350         if (priv->current_status & CYP_ERROR) {
1351                 spin_unlock_irqrestore(&priv->lock, flags);
1352                 tty_flag = TTY_PARITY;
1353                 dbg("%s - Parity Error detected", __func__);
1354         } else
1355                 spin_unlock_irqrestore(&priv->lock, flags);
1356
1357         /* process read if there is data other than line status */
1358         if (tty && (bytes > i)) {
1359                 bytes = tty_buffer_request_room(tty, bytes);
1360                 for (; i < bytes ; ++i) {
1361                         dbg("pushing byte number %d - %d - %c", i, data[i],
1362                                         data[i]);
1363                         tty_insert_flip_char(tty, data[i], tty_flag);
1364                 }
1365                 tty_flip_buffer_push(tty);
1366         }
1367
1368         spin_lock_irqsave(&priv->lock, flags);
1369         /* control and status byte(s) are also counted */
1370         priv->bytes_in += bytes;
1371         spin_unlock_irqrestore(&priv->lock, flags);
1372
1373 continue_read:
1374         tty_kref_put(tty);
1375
1376         /* Continue trying to always read... unless the port has closed. */
1377
1378         if (port->port.count > 0 && priv->comm_is_ok) {
1379                 usb_fill_int_urb(port->interrupt_in_urb, port->serial->dev,
1380                                 usb_rcvintpipe(port->serial->dev,
1381                                         port->interrupt_in_endpointAddress),
1382                                 port->interrupt_in_urb->transfer_buffer,
1383                                 port->interrupt_in_urb->transfer_buffer_length,
1384                                 cypress_read_int_callback, port,
1385                                 priv->read_urb_interval);
1386                 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
1387                 if (result) {
1388                         dev_err(&urb->dev->dev, "%s - failed resubmitting "
1389                                         "read urb, error %d\n", __func__,
1390                                         result);
1391                         cypress_set_dead(port);
1392                 }
1393         }
1394
1395         return;
1396 } /* cypress_read_int_callback */
1397
1398
1399 static void cypress_write_int_callback(struct urb *urb)
1400 {
1401         struct usb_serial_port *port = urb->context;
1402         struct cypress_private *priv = usb_get_serial_port_data(port);
1403         int result;
1404         int status = urb->status;
1405
1406         dbg("%s - port %d", __func__, port->number);
1407
1408         switch (status) {
1409         case 0:
1410                 /* success */
1411                 break;
1412         case -ECONNRESET:
1413         case -ENOENT:
1414         case -ESHUTDOWN:
1415                 /* this urb is terminated, clean up */
1416                 dbg("%s - urb shutting down with status: %d",
1417                                                 __func__, status);
1418                 priv->write_urb_in_use = 0;
1419                 return;
1420         case -EPIPE: /* no break needed; clear halt and resubmit */
1421                 if (!priv->comm_is_ok)
1422                         break;
1423                 usb_clear_halt(port->serial->dev, 0x02);
1424                 /* error in the urb, so we have to resubmit it */
1425                 dbg("%s - nonzero write bulk status received: %d",
1426                         __func__, status);
1427                 port->interrupt_out_urb->transfer_buffer_length = 1;
1428                 port->interrupt_out_urb->dev = port->serial->dev;
1429                 result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC);
1430                 if (!result)
1431                         return;
1432                 dev_err(&urb->dev->dev,
1433                         "%s - failed resubmitting write urb, error %d\n",
1434                                                         __func__, result);
1435                 cypress_set_dead(port);
1436                 break;
1437         default:
1438                 dev_err(&urb->dev->dev,
1439                          "%s - unexpected nonzero write status received: %d\n",
1440                                                         __func__, status);
1441                 cypress_set_dead(port);
1442                 break;
1443         }
1444         priv->write_urb_in_use = 0;
1445
1446         /* send any buffered data */
1447         cypress_send(port);
1448 }
1449
1450
1451 /*****************************************************************************
1452  * Write buffer functions - buffering code from pl2303 used
1453  *****************************************************************************/
1454
1455 /*
1456  * cypress_buf_alloc
1457  *
1458  * Allocate a circular buffer and all associated memory.
1459  */
1460
1461 static struct cypress_buf *cypress_buf_alloc(unsigned int size)
1462 {
1463
1464         struct cypress_buf *cb;
1465
1466
1467         if (size == 0)
1468                 return NULL;
1469
1470         cb = kmalloc(sizeof(struct cypress_buf), GFP_KERNEL);
1471         if (cb == NULL)
1472                 return NULL;
1473
1474         cb->buf_buf = kmalloc(size, GFP_KERNEL);
1475         if (cb->buf_buf == NULL) {
1476                 kfree(cb);
1477                 return NULL;
1478         }
1479
1480         cb->buf_size = size;
1481         cb->buf_get = cb->buf_put = cb->buf_buf;
1482
1483         return cb;
1484
1485 }
1486
1487
1488 /*
1489  * cypress_buf_free
1490  *
1491  * Free the buffer and all associated memory.
1492  */
1493
1494 static void cypress_buf_free(struct cypress_buf *cb)
1495 {
1496         if (cb) {
1497                 kfree(cb->buf_buf);
1498                 kfree(cb);
1499         }
1500 }
1501
1502
1503 /*
1504  * cypress_buf_clear
1505  *
1506  * Clear out all data in the circular buffer.
1507  */
1508
1509 static void cypress_buf_clear(struct cypress_buf *cb)
1510 {
1511         if (cb != NULL)
1512                 cb->buf_get = cb->buf_put;
1513                 /* equivalent to a get of all data available */
1514 }
1515
1516
1517 /*
1518  * cypress_buf_data_avail
1519  *
1520  * Return the number of bytes of data available in the circular
1521  * buffer.
1522  */
1523
1524 static unsigned int cypress_buf_data_avail(struct cypress_buf *cb)
1525 {
1526         if (cb != NULL)
1527                 return (cb->buf_size + cb->buf_put - cb->buf_get)
1528                                                         % cb->buf_size;
1529         else
1530                 return 0;
1531 }
1532
1533
1534 /*
1535  * cypress_buf_space_avail
1536  *
1537  * Return the number of bytes of space available in the circular
1538  * buffer.
1539  */
1540
1541 static unsigned int cypress_buf_space_avail(struct cypress_buf *cb)
1542 {
1543         if (cb != NULL)
1544                 return (cb->buf_size + cb->buf_get - cb->buf_put - 1)
1545                                                         % cb->buf_size;
1546         else
1547                 return 0;
1548 }
1549
1550
1551 /*
1552  * cypress_buf_put
1553  *
1554  * Copy data data from a user buffer and put it into the circular buffer.
1555  * Restrict to the amount of space available.
1556  *
1557  * Return the number of bytes copied.
1558  */
1559
1560 static unsigned int cypress_buf_put(struct cypress_buf *cb, const char *buf,
1561         unsigned int count)
1562 {
1563
1564         unsigned int len;
1565
1566
1567         if (cb == NULL)
1568                 return 0;
1569
1570         len  = cypress_buf_space_avail(cb);
1571         if (count > len)
1572                 count = len;
1573
1574         if (count == 0)
1575                 return 0;
1576
1577         len = cb->buf_buf + cb->buf_size - cb->buf_put;
1578         if (count > len) {
1579                 memcpy(cb->buf_put, buf, len);
1580                 memcpy(cb->buf_buf, buf+len, count - len);
1581                 cb->buf_put = cb->buf_buf + count - len;
1582         } else {
1583                 memcpy(cb->buf_put, buf, count);
1584                 if (count < len)
1585                         cb->buf_put += count;
1586                 else /* count == len */
1587                         cb->buf_put = cb->buf_buf;
1588         }
1589
1590         return count;
1591
1592 }
1593
1594
1595 /*
1596  * cypress_buf_get
1597  *
1598  * Get data from the circular buffer and copy to the given buffer.
1599  * Restrict to the amount of data available.
1600  *
1601  * Return the number of bytes copied.
1602  */
1603
1604 static unsigned int cypress_buf_get(struct cypress_buf *cb, char *buf,
1605         unsigned int count)
1606 {
1607
1608         unsigned int len;
1609
1610
1611         if (cb == NULL)
1612                 return 0;
1613
1614         len = cypress_buf_data_avail(cb);
1615         if (count > len)
1616                 count = len;
1617
1618         if (count == 0)
1619                 return 0;
1620
1621         len = cb->buf_buf + cb->buf_size - cb->buf_get;
1622         if (count > len) {
1623                 memcpy(buf, cb->buf_get, len);
1624                 memcpy(buf+len, cb->buf_buf, count - len);
1625                 cb->buf_get = cb->buf_buf + count - len;
1626         } else {
1627                 memcpy(buf, cb->buf_get, count);
1628                 if (count < len)
1629                         cb->buf_get += count;
1630                 else /* count == len */
1631                         cb->buf_get = cb->buf_buf;
1632         }
1633
1634         return count;
1635
1636 }
1637
1638 /*****************************************************************************
1639  * Module functions
1640  *****************************************************************************/
1641
1642 static int __init cypress_init(void)
1643 {
1644         int retval;
1645
1646         dbg("%s", __func__);
1647
1648         retval = usb_serial_register(&cypress_earthmate_device);
1649         if (retval)
1650                 goto failed_em_register;
1651         retval = usb_serial_register(&cypress_hidcom_device);
1652         if (retval)
1653                 goto failed_hidcom_register;
1654         retval = usb_serial_register(&cypress_ca42v2_device);
1655         if (retval)
1656                 goto failed_ca42v2_register;
1657         retval = usb_register(&cypress_driver);
1658         if (retval)
1659                 goto failed_usb_register;
1660
1661         info(DRIVER_DESC " " DRIVER_VERSION);
1662         return 0;
1663
1664 failed_usb_register:
1665         usb_serial_deregister(&cypress_ca42v2_device);
1666 failed_ca42v2_register:
1667         usb_serial_deregister(&cypress_hidcom_device);
1668 failed_hidcom_register:
1669         usb_serial_deregister(&cypress_earthmate_device);
1670 failed_em_register:
1671         return retval;
1672 }
1673
1674
1675 static void __exit cypress_exit(void)
1676 {
1677         dbg("%s", __func__);
1678
1679         usb_deregister(&cypress_driver);
1680         usb_serial_deregister(&cypress_earthmate_device);
1681         usb_serial_deregister(&cypress_hidcom_device);
1682         usb_serial_deregister(&cypress_ca42v2_device);
1683 }
1684
1685
1686 module_init(cypress_init);
1687 module_exit(cypress_exit);
1688
1689 MODULE_AUTHOR(DRIVER_AUTHOR);
1690 MODULE_DESCRIPTION(DRIVER_DESC);
1691 MODULE_VERSION(DRIVER_VERSION);
1692 MODULE_LICENSE("GPL");
1693
1694 module_param(debug, bool, S_IRUGO | S_IWUSR);
1695 MODULE_PARM_DESC(debug, "Debug enabled or not");
1696 module_param(stats, bool, S_IRUGO | S_IWUSR);
1697 MODULE_PARM_DESC(stats, "Enable statistics or not");
1698 module_param(interval, int, S_IRUGO | S_IWUSR);
1699 MODULE_PARM_DESC(interval, "Overrides interrupt interval");