?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
kbuild: Fix instrumentation removal breakage on avr32
[wrt350n-kernel.git] / drivers / usb / serial / cypress_m8.c
blob08c65c1a377163ded8eaf7f861674250852bcc6c
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 driver
15 *
16 * See http://geocities.com/i0xox0i for information on this driver and the
17 * earthmate usb device.
18 *
19 * Lonnie Mendez <dignome@gmail.com>
20 * 4-29-2005
21 * Fixed problem where setting or retreiving the serial config would fail with
22 * EPIPE. Removed CRTS toggling so the driver behaves more like other usbserial
23 * adapters. Issued new interval of 1ms instead of the default 10ms. As a
24 * result, transfer speed has been substantially increased. From avg. 850bps to
25 * avg. 3300bps. initial termios has also been modified. Cleaned up code and
26 * formatting issues so it is more readable. Replaced the C++ style comments.
27 *
28 * Lonnie Mendez <dignome@gmail.com>
29 * 12-15-2004
30 * Incorporated write buffering from pl2303 driver. Fixed bug with line
31 * handling so both lines are raised in cypress_open. (was dropping rts)
32 * Various code cleanups made as well along with other misc bug fixes.
33 *
34 * Lonnie Mendez <dignome@gmail.com>
35 * 04-10-2004
36 * Driver modified to support dynamic line settings. Various improvments
37 * and features.
38 *
39 * Neil Whelchel
40 * 10-2003
41 * Driver first released.
42 *
43 */
44
45 /* Thanks to Neil Whelchel for writing the first cypress m8 implementation for linux. */
46 /* Thanks to cypress for providing references for the hid reports. */
47 /* Thanks to Jiang Zhang for providing links and for general help. */
48 /* Code originates and was built up from ftdi_sio, belkin, pl2303 and others. */
49
50
51 #include <linux/kernel.h>
52 #include <linux/errno.h>
53 #include <linux/init.h>
54 #include <linux/slab.h>
55 #include <linux/tty.h>
56 #include <linux/tty_driver.h>
57 #include <linux/tty_flip.h>
58 #include <linux/module.h>
59 #include <linux/moduleparam.h>
60 #include <linux/spinlock.h>
61 #include <linux/usb.h>
62 #include <linux/usb/serial.h>
63 #include <linux/serial.h>
64 #include <linux/delay.h>
65 #include <asm/uaccess.h>
66
67 #include "cypress_m8.h"
68
69
70 #ifdef CONFIG_USB_SERIAL_DEBUG
71 static int debug = 1;
72 #else
73 static int debug;
74 #endif
75 static int stats;
76 static int interval;
77
78 /*
79 * Version Information
80 */
81 #define DRIVER_VERSION "v1.09"
82 #define DRIVER_AUTHOR "Lonnie Mendez <dignome@gmail.com>, Neil Whelchel <koyama@firstlight.net>"
83 #define DRIVER_DESC "Cypress USB to Serial Driver"
84
85 /* write buffer size defines */
86 #define CYPRESS_BUF_SIZE 1024
87 #define CYPRESS_CLOSING_WAIT (30*HZ)
88
89 static struct usb_device_id id_table_earthmate [] = {
90 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
91 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
92 { } /* Terminating entry */
93 };
94
95 static struct usb_device_id id_table_cyphidcomrs232 [] = {
96 { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
97 { } /* Terminating entry */
98 };
99
100 static struct usb_device_id id_table_nokiaca42v2 [] = {
101 { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
102 { } /* Terminating entry */
103 };
104
105 static struct usb_device_id id_table_combined [] = {
106 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
107 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
108 { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
109 { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
110 { } /* Terminating entry */
111 };
112
113 MODULE_DEVICE_TABLE (usb, id_table_combined);
114
115 static struct usb_driver cypress_driver = {
116 .name = "cypress",
117 .probe = usb_serial_probe,
118 .disconnect = usb_serial_disconnect,
119 .id_table = id_table_combined,
120 .no_dynamic_id = 1,
121 };
122
123 struct cypress_private {
124 spinlock_t lock; /* private lock */
125 int chiptype; /* identifier of device, for quirks/etc */
126 int bytes_in; /* used for statistics */
127 int bytes_out; /* used for statistics */
128 int cmd_count; /* used for statistics */
129 int cmd_ctrl; /* always set this to 1 before issuing a command */
130 struct cypress_buf *buf; /* write buffer */
131 int write_urb_in_use; /* write urb in use indicator */
132 int write_urb_interval; /* interval to use for write urb */
133 int read_urb_interval; /* interval to use for read urb */
134 int comm_is_ok; /* true if communication is (still) ok */
135 int termios_initialized;
136 __u8 line_control; /* holds dtr / rts value */
137 __u8 current_status; /* received from last read - info on dsr,cts,cd,ri,etc */
138 __u8 current_config; /* stores the current configuration byte */
139 __u8 rx_flags; /* throttling - used from whiteheat/ftdi_sio */
140 int baud_rate; /* stores current baud rate in integer form */
141 int cbr_mask; /* stores current baud rate in masked form */
142 int isthrottled; /* if throttled, discard reads */
143 wait_queue_head_t delta_msr_wait; /* used for TIOCMIWAIT */
144 char prev_status, diff_status; /* used for TIOCMIWAIT */
145 /* we pass a pointer to this as the arguement sent to cypress_set_termios old_termios */
146 struct ktermios tmp_termios; /* stores the old termios settings */
147 };
148
149 /* write buffer structure */
150 struct cypress_buf {
151 unsigned int buf_size;
152 char *buf_buf;
153 char *buf_get;
154 char *buf_put;
155 };
156
157 /* function prototypes for the Cypress USB to serial device */
158 static int cypress_earthmate_startup (struct usb_serial *serial);
159 static int cypress_hidcom_startup (struct usb_serial *serial);
160 static int cypress_ca42v2_startup (struct usb_serial *serial);
161 static void cypress_shutdown (struct usb_serial *serial);
162 static int cypress_open (struct usb_serial_port *port, struct file *filp);
163 static void cypress_close (struct usb_serial_port *port, struct file *filp);
164 static int cypress_write (struct usb_serial_port *port, const unsigned char *buf, int count);
165 static void cypress_send (struct usb_serial_port *port);
166 static int cypress_write_room (struct usb_serial_port *port);
167 static int cypress_ioctl (struct usb_serial_port *port, struct file * file, unsigned int cmd, unsigned long arg);
168 static void cypress_set_termios (struct usb_serial_port *port, struct ktermios * old);
169 static int cypress_tiocmget (struct usb_serial_port *port, struct file *file);
170 static int cypress_tiocmset (struct usb_serial_port *port, struct file *file, unsigned int set, unsigned int clear);
171 static int cypress_chars_in_buffer (struct usb_serial_port *port);
172 static void cypress_throttle (struct usb_serial_port *port);
173 static void cypress_unthrottle (struct usb_serial_port *port);
174 static void cypress_set_dead (struct usb_serial_port *port);
175 static void cypress_read_int_callback (struct urb *urb);
176 static void cypress_write_int_callback (struct urb *urb);
177 /* baud helper functions */
178 static int mask_to_rate (unsigned mask);
179 static unsigned rate_to_mask (int rate);
180 /* write buffer functions */
181 static struct cypress_buf *cypress_buf_alloc(unsigned int size);
182 static void cypress_buf_free(struct cypress_buf *cb);
183 static void cypress_buf_clear(struct cypress_buf *cb);
184 static unsigned int cypress_buf_data_avail(struct cypress_buf *cb);
185 static unsigned int cypress_buf_space_avail(struct cypress_buf *cb);
186 static unsigned int cypress_buf_put(struct cypress_buf *cb, const char *buf, unsigned int count);
187 static unsigned int cypress_buf_get(struct cypress_buf *cb, char *buf, unsigned int count);
188
189
190 static struct usb_serial_driver cypress_earthmate_device = {
191 .driver = {
192 .owner = THIS_MODULE,
193 .name = "earthmate",
194 },
195 .description = "DeLorme Earthmate USB",
196 .usb_driver = &cypress_driver,
197 .id_table = id_table_earthmate,
198 .num_interrupt_in = 1,
199 .num_interrupt_out = 1,
200 .num_bulk_in = NUM_DONT_CARE,
201 .num_bulk_out = NUM_DONT_CARE,
202 .num_ports = 1,
203 .attach = cypress_earthmate_startup,
204 .shutdown = cypress_shutdown,
205 .open = cypress_open,
206 .close = cypress_close,
207 .write = cypress_write,
208 .write_room = cypress_write_room,
209 .ioctl = cypress_ioctl,
210 .set_termios = cypress_set_termios,
211 .tiocmget = cypress_tiocmget,
212 .tiocmset = cypress_tiocmset,
213 .chars_in_buffer = cypress_chars_in_buffer,
214 .throttle = cypress_throttle,
215 .unthrottle = cypress_unthrottle,
216 .read_int_callback = cypress_read_int_callback,
217 .write_int_callback = cypress_write_int_callback,
218 };
219
220 static struct usb_serial_driver cypress_hidcom_device = {
221 .driver = {
222 .owner = THIS_MODULE,
223 .name = "cyphidcom",
224 },
225 .description = "HID->COM RS232 Adapter",
226 .usb_driver = &cypress_driver,
227 .id_table = id_table_cyphidcomrs232,
228 .num_interrupt_in = 1,
229 .num_interrupt_out = 1,
230 .num_bulk_in = NUM_DONT_CARE,
231 .num_bulk_out = NUM_DONT_CARE,
232 .num_ports = 1,
233 .attach = cypress_hidcom_startup,
234 .shutdown = cypress_shutdown,
235 .open = cypress_open,
236 .close = cypress_close,
237 .write = cypress_write,
238 .write_room = cypress_write_room,
239 .ioctl = cypress_ioctl,
240 .set_termios = cypress_set_termios,
241 .tiocmget = cypress_tiocmget,
242 .tiocmset = cypress_tiocmset,
243 .chars_in_buffer = cypress_chars_in_buffer,
244 .throttle = cypress_throttle,
245 .unthrottle = cypress_unthrottle,
246 .read_int_callback = cypress_read_int_callback,
247 .write_int_callback = cypress_write_int_callback,
248 };
249
250 static struct usb_serial_driver cypress_ca42v2_device = {
251 .driver = {
252 .owner = THIS_MODULE,
253 .name = "nokiaca42v2",
254 },
255 .description = "Nokia CA-42 V2 Adapter",
256 .usb_driver = &cypress_driver,
257 .id_table = id_table_nokiaca42v2,
258 .num_interrupt_in = 1,
259 .num_interrupt_out = 1,
260 .num_bulk_in = NUM_DONT_CARE,
261 .num_bulk_out = NUM_DONT_CARE,
262 .num_ports = 1,
263 .attach = cypress_ca42v2_startup,
264 .shutdown = cypress_shutdown,
265 .open = cypress_open,
266 .close = cypress_close,
267 .write = cypress_write,
268 .write_room = cypress_write_room,
269 .ioctl = cypress_ioctl,
270 .set_termios = cypress_set_termios,
271 .tiocmget = cypress_tiocmget,
272 .tiocmset = cypress_tiocmset,
273 .chars_in_buffer = cypress_chars_in_buffer,
274 .throttle = cypress_throttle,
275 .unthrottle = cypress_unthrottle,
276 .read_int_callback = cypress_read_int_callback,
277 .write_int_callback = cypress_write_int_callback,
278 };
279
280 /*****************************************************************************
281 * Cypress serial helper functions
282 *****************************************************************************/
283
284
285 /* This function can either set or retrieve the current serial line settings */
286 static int cypress_serial_control (struct usb_serial_port *port, unsigned baud_mask, int data_bits, int stop_bits,
287 int parity_enable, int parity_type, int reset, int cypress_request_type)
288 {
289 int new_baudrate = 0, retval = 0, tries = 0;
290 struct cypress_private *priv;
291 __u8 feature_buffer[8];
292 unsigned long flags;
293
294 dbg("%s", __FUNCTION__);
295
296 priv = usb_get_serial_port_data(port);
297
298 if (!priv->comm_is_ok)
299 return -ENODEV;
300
301 switch(cypress_request_type) {
302 case CYPRESS_SET_CONFIG:
303
304 /*
305 * The general purpose firmware for the Cypress M8 allows for a maximum speed
306 * of 57600bps (I have no idea whether DeLorme chose to use the general purpose
307 * firmware or not), if you need to modify this speed setting for your own
308 * project please add your own chiptype and modify the code likewise. The
309 * Cypress HID->COM device will work successfully up to 115200bps (but the
310 * actual throughput is around 3kBps).
311 */
312 if (baud_mask != priv->cbr_mask) {
313 dbg("%s - baud rate is changing", __FUNCTION__);
314 if ( priv->chiptype == CT_EARTHMATE ) {
315 /* 300 and 600 baud rates are supported under the generic firmware,
316 * but are not used with NMEA and SiRF protocols */
317
318 if ( (baud_mask == B300) || (baud_mask == B600) ) {
319 err("%s - failed setting baud rate, unsupported speed",
320 __FUNCTION__);
321 new_baudrate = priv->baud_rate;
322 } else if ( (new_baudrate = mask_to_rate(baud_mask)) == -1) {
323 err("%s - failed setting baud rate, unsupported speed",
324 __FUNCTION__);
325 new_baudrate = priv->baud_rate;
326 }
327 } else if (priv->chiptype == CT_CYPHIDCOM) {
328 if ( (new_baudrate = mask_to_rate(baud_mask)) == -1) {
329 err("%s - failed setting baud rate, unsupported speed",
330 __FUNCTION__);
331 new_baudrate = priv->baud_rate;
332 }
333 } else if (priv->chiptype == CT_CA42V2) {
334 if ( (new_baudrate = mask_to_rate(baud_mask)) == -1) {
335 err("%s - failed setting baud rate, unsupported speed",
336 __FUNCTION__);
337 new_baudrate = priv->baud_rate;
338 }
339 } else if (priv->chiptype == CT_GENERIC) {
340 if ( (new_baudrate = mask_to_rate(baud_mask)) == -1) {
341 err("%s - failed setting baud rate, unsupported speed",
342 __FUNCTION__);
343 new_baudrate = priv->baud_rate;
344 }
345 } else {
346 info("%s - please define your chiptype", __FUNCTION__);
347 new_baudrate = priv->baud_rate;
348 }
349 } else { /* baud rate not changing, keep the old */
350 new_baudrate = priv->baud_rate;
351 }
352 dbg("%s - baud rate is being sent as %d", __FUNCTION__, new_baudrate);
353
354 memset(feature_buffer, 0, 8);
355 /* fill the feature_buffer with new configuration */
356 *((u_int32_t *)feature_buffer) = new_baudrate;
357
358 feature_buffer[4] |= data_bits; /* assign data bits in 2 bit space ( max 3 ) */
359 /* 1 bit gap */
360 feature_buffer[4] |= (stop_bits << 3); /* assign stop bits in 1 bit space */
361 feature_buffer[4] |= (parity_enable << 4); /* assign parity flag in 1 bit space */
362 feature_buffer[4] |= (parity_type << 5); /* assign parity type in 1 bit space */
363 /* 1 bit gap */
364 feature_buffer[4] |= (reset << 7); /* assign reset at end of byte, 1 bit space */
365
366 dbg("%s - device is being sent this feature report:", __FUNCTION__);
367 dbg("%s - %02X - %02X - %02X - %02X - %02X", __FUNCTION__, feature_buffer[0], feature_buffer[1],
368 feature_buffer[2], feature_buffer[3], feature_buffer[4]);
369
370 do {
371 retval = usb_control_msg (port->serial->dev, usb_sndctrlpipe(port->serial->dev, 0),
372 HID_REQ_SET_REPORT, USB_DIR_OUT | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
373 0x0300, 0, feature_buffer, 8, 500);
374
375 if (tries++ >= 3)
376 break;
377
378 } while (retval != 8 && retval != -ENODEV);
379
380 if (retval != 8) {
381 err("%s - failed sending serial line settings - %d", __FUNCTION__, retval);
382 cypress_set_dead(port);
383 } else {
384 spin_lock_irqsave(&priv->lock, flags);
385 priv->baud_rate = new_baudrate;
386 priv->cbr_mask = baud_mask;
387 priv->current_config = feature_buffer[4];
388 spin_unlock_irqrestore(&priv->lock, flags);
389 }
390 break;
391 case CYPRESS_GET_CONFIG:
392 dbg("%s - retreiving serial line settings", __FUNCTION__);
393 /* set initial values in feature buffer */
394 memset(feature_buffer, 0, 8);
395
396 do {
397 retval = usb_control_msg (port->serial->dev, usb_rcvctrlpipe(port->serial->dev, 0),
398 HID_REQ_GET_REPORT, USB_DIR_IN | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
399 0x0300, 0, feature_buffer, 8, 500);
400
401 if (tries++ >= 3)
402 break;
403
404 } while (retval != 5 && retval != -ENODEV);
405
406 if (retval != 5) {
407 err("%s - failed to retrieve serial line settings - %d", __FUNCTION__, retval);
408 cypress_set_dead(port);
409 return retval;
410 } else {
411 spin_lock_irqsave(&priv->lock, flags);
412
413 /* store the config in one byte, and later use bit masks to check values */
414 priv->current_config = feature_buffer[4];
415 priv->baud_rate = *((u_int32_t *)feature_buffer);
416
417 if ( (priv->cbr_mask = rate_to_mask(priv->baud_rate)) == 0x40)
418 dbg("%s - failed setting the baud mask (not defined)", __FUNCTION__);
419 spin_unlock_irqrestore(&priv->lock, flags);
420 }
421 }
422 spin_lock_irqsave(&priv->lock, flags);
423 ++priv->cmd_count;
424 spin_unlock_irqrestore(&priv->lock, flags);
425
426 return retval;
427 } /* cypress_serial_control */
428
429
430 static void cypress_set_dead(struct usb_serial_port *port)
431 {
432 struct cypress_private *priv = usb_get_serial_port_data(port);
433 unsigned long flags;
434
435 spin_lock_irqsave(&priv->lock, flags);
436 if (!priv->comm_is_ok) {
437 spin_unlock_irqrestore(&priv->lock, flags);
438 return;
439 }
440 priv->comm_is_ok = 0;
441 spin_unlock_irqrestore(&priv->lock, flags);
442
443 err("cypress_m8 suspending failing port %d - interval might be too short",
444 port->number);
445 }
446
447
448 /* given a baud mask, it will return integer baud on success */
449 static int mask_to_rate (unsigned mask)
450 {
451 int rate;
452
453 switch (mask) {
454 case B0: rate = 0; break;
455 case B300: rate = 300; break;
456 case B600: rate = 600; break;
457 case B1200: rate = 1200; break;
458 case B2400: rate = 2400; break;
459 case B4800: rate = 4800; break;
460 case B9600: rate = 9600; break;
461 case B19200: rate = 19200; break;
462 case B38400: rate = 38400; break;
463 case B57600: rate = 57600; break;
464 case B115200: rate = 115200; break;
465 default: rate = -1;
466 }
467
468 return rate;
469 }
470
471
472 static unsigned rate_to_mask (int rate)
473 {
474 unsigned mask;
475
476 switch (rate) {
477 case 0: mask = B0; break;
478 case 300: mask = B300; break;
479 case 600: mask = B600; break;
480 case 1200: mask = B1200; break;
481 case 2400: mask = B2400; break;
482 case 4800: mask = B4800; break;
483 case 9600: mask = B9600; break;
484 case 19200: mask = B19200; break;
485 case 38400: mask = B38400; break;
486 case 57600: mask = B57600; break;
487 case 115200: mask = B115200; break;
488 default: mask = 0x40;
489 }
490
491 return mask;
492 }
493 /*****************************************************************************
494 * Cypress serial driver functions
495 *****************************************************************************/
496
497
498 static int generic_startup (struct usb_serial *serial)
499 {
500 struct cypress_private *priv;
501 struct usb_serial_port *port = serial->port[0];
502
503 dbg("%s - port %d", __FUNCTION__, port->number);
504
505 priv = kzalloc(sizeof (struct cypress_private), GFP_KERNEL);
506 if (!priv)
507 return -ENOMEM;
508
509 priv->comm_is_ok = !0;
510 spin_lock_init(&priv->lock);
511 priv->buf = cypress_buf_alloc(CYPRESS_BUF_SIZE);
512 if (priv->buf == NULL) {
513 kfree(priv);
514 return -ENOMEM;
515 }
516 init_waitqueue_head(&priv->delta_msr_wait);
517
518 usb_reset_configuration (serial->dev);
519
520 priv->cmd_ctrl = 0;
521 priv->line_control = 0;
522 priv->termios_initialized = 0;
523 priv->rx_flags = 0;
524 priv->cbr_mask = B300;
525 if (interval > 0) {
526 priv->write_urb_interval = interval;
527 priv->read_urb_interval = interval;
528 dbg("%s - port %d read & write intervals forced to %d",
529 __FUNCTION__,port->number,interval);
530 } else {
531 priv->write_urb_interval = port->interrupt_out_urb->interval;
532 priv->read_urb_interval = port->interrupt_in_urb->interval;
533 dbg("%s - port %d intervals: read=%d write=%d",
534 __FUNCTION__,port->number,
535 priv->read_urb_interval,priv->write_urb_interval);
536 }
537 usb_set_serial_port_data(port, priv);
538
539 return 0;
540 }
541
542
543 static int cypress_earthmate_startup (struct usb_serial *serial)
544 {
545 struct cypress_private *priv;
546
547 dbg("%s", __FUNCTION__);
548
549 if (generic_startup(serial)) {
550 dbg("%s - Failed setting up port %d", __FUNCTION__,
551 serial->port[0]->number);
552 return 1;
553 }
554
555 priv = usb_get_serial_port_data(serial->port[0]);
556 priv->chiptype = CT_EARTHMATE;
557
558 return 0;
559 } /* cypress_earthmate_startup */
560
561
562 static int cypress_hidcom_startup (struct usb_serial *serial)
563 {
564 struct cypress_private *priv;
565
566 dbg("%s", __FUNCTION__);
567
568 if (generic_startup(serial)) {
569 dbg("%s - Failed setting up port %d", __FUNCTION__,
570 serial->port[0]->number);
571 return 1;
572 }
573
574 priv = usb_get_serial_port_data(serial->port[0]);
575 priv->chiptype = CT_CYPHIDCOM;
576
577 return 0;
578 } /* cypress_hidcom_startup */
579
580
581 static int cypress_ca42v2_startup (struct usb_serial *serial)
582 {
583 struct cypress_private *priv;
584
585 dbg("%s", __FUNCTION__);
586
587 if (generic_startup(serial)) {
588 dbg("%s - Failed setting up port %d", __FUNCTION__,
589 serial->port[0]->number);
590 return 1;
591 }
592
593 priv = usb_get_serial_port_data(serial->port[0]);
594 priv->chiptype = CT_CA42V2;
595
596 return 0;
597 } /* cypress_ca42v2_startup */
598
599
600 static void cypress_shutdown (struct usb_serial *serial)
601 {
602 struct cypress_private *priv;
603
604 dbg ("%s - port %d", __FUNCTION__, serial->port[0]->number);
605
606 /* all open ports are closed at this point */
607
608 priv = usb_get_serial_port_data(serial->port[0]);
609
610 if (priv) {
611 cypress_buf_free(priv->buf);
612 kfree(priv);
613 usb_set_serial_port_data(serial->port[0], NULL);
614 }
615 }
616
617
618 static int cypress_open (struct usb_serial_port *port, struct file *filp)
619 {
620 struct cypress_private *priv = usb_get_serial_port_data(port);
621 struct usb_serial *serial = port->serial;
622 unsigned long flags;
623 int result = 0;
624
625 dbg("%s - port %d", __FUNCTION__, port->number);
626
627 if (!priv->comm_is_ok)
628 return -EIO;
629
630 /* clear halts before open */
631 usb_clear_halt(serial->dev, 0x81);
632 usb_clear_halt(serial->dev, 0x02);
633
634 spin_lock_irqsave(&priv->lock, flags);
635 /* reset read/write statistics */
636 priv->bytes_in = 0;
637 priv->bytes_out = 0;
638 priv->cmd_count = 0;
639 priv->rx_flags = 0;
640 spin_unlock_irqrestore(&priv->lock, flags);
641
642 /* setting to zero could cause data loss */
643 port->tty->low_latency = 1;
644
645 /* raise both lines and set termios */
646 spin_lock_irqsave(&priv->lock, flags);
647 priv->line_control = CONTROL_DTR | CONTROL_RTS;
648 priv->cmd_ctrl = 1;
649 spin_unlock_irqrestore(&priv->lock, flags);
650 result = cypress_write(port, NULL, 0);
651
652 if (result) {
653 dev_err(&port->dev, "%s - failed setting the control lines - error %d\n", __FUNCTION__, result);
654 return result;
655 } else
656 dbg("%s - success setting the control lines", __FUNCTION__);
657
658 cypress_set_termios(port, &priv->tmp_termios);
659
660 /* setup the port and start reading from the device */
661 if(!port->interrupt_in_urb){
662 err("%s - interrupt_in_urb is empty!", __FUNCTION__);
663 return(-1);
664 }
665
666 usb_fill_int_urb(port->interrupt_in_urb, serial->dev,
667 usb_rcvintpipe(serial->dev, port->interrupt_in_endpointAddress),
668 port->interrupt_in_urb->transfer_buffer, port->interrupt_in_urb->transfer_buffer_length,
669 cypress_read_int_callback, port, priv->read_urb_interval);
670 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
671
672 if (result){
673 dev_err(&port->dev, "%s - failed submitting read urb, error %d\n", __FUNCTION__, result);
674 cypress_set_dead(port);
675 }
676
677 return result;
678 } /* cypress_open */
679
680
681 static void cypress_close(struct usb_serial_port *port, struct file * filp)
682 {
683 struct cypress_private *priv = usb_get_serial_port_data(port);
684 unsigned int c_cflag;
685 int bps;
686 long timeout;
687 wait_queue_t wait;
688
689 dbg("%s - port %d", __FUNCTION__, port->number);
690
691 /* wait for data to drain from buffer */
692 spin_lock_irq(&priv->lock);
693 timeout = CYPRESS_CLOSING_WAIT;
694 init_waitqueue_entry(&wait, current);
695 add_wait_queue(&port->tty->write_wait, &wait);
696 for (;;) {
697 set_current_state(TASK_INTERRUPTIBLE);
698 if (cypress_buf_data_avail(priv->buf) == 0
699 || timeout == 0 || signal_pending(current)
700 /* without mutex, allowed due to harmless failure mode */
701 || port->serial->disconnected)
702 break;
703 spin_unlock_irq(&priv->lock);
704 timeout = schedule_timeout(timeout);
705 spin_lock_irq(&priv->lock);
706 }
707 set_current_state(TASK_RUNNING);
708 remove_wait_queue(&port->tty->write_wait, &wait);
709 /* clear out any remaining data in the buffer */
710 cypress_buf_clear(priv->buf);
711 spin_unlock_irq(&priv->lock);
712
713 /* writing is potentially harmful, lock must be taken */
714 mutex_lock(&port->serial->disc_mutex);
715 if (port->serial->disconnected) {
716 mutex_unlock(&port->serial->disc_mutex);
717 return;
718 }
719 /* wait for characters to drain from device */
720 bps = tty_get_baud_rate(port->tty);
721 if (bps > 1200)
722 timeout = max((HZ*2560)/bps,HZ/10);
723 else
724 timeout = 2*HZ;
725 schedule_timeout_interruptible(timeout);
726
727 dbg("%s - stopping urbs", __FUNCTION__);
728 usb_kill_urb (port->interrupt_in_urb);
729 usb_kill_urb (port->interrupt_out_urb);
730
731 if (port->tty) {
732 c_cflag = port->tty->termios->c_cflag;
733 if (c_cflag & HUPCL) {
734 /* drop dtr and rts */
735 priv = usb_get_serial_port_data(port);
736 spin_lock_irq(&priv->lock);
737 priv->line_control = 0;
738 priv->cmd_ctrl = 1;
739 spin_unlock_irq(&priv->lock);
740 cypress_write(port, NULL, 0);
741 }
742 }
743
744 if (stats)
745 dev_info (&port->dev, "Statistics: %d Bytes In | %d Bytes Out | %d Commands Issued\n",
746 priv->bytes_in, priv->bytes_out, priv->cmd_count);
747 mutex_unlock(&port->serial->disc_mutex);
748 } /* cypress_close */
749
750
751 static int cypress_write(struct usb_serial_port *port, const unsigned char *buf, int count)
752 {
753 struct cypress_private *priv = usb_get_serial_port_data(port);
754 unsigned long flags;
755
756 dbg("%s - port %d, %d bytes", __FUNCTION__, port->number, count);
757
758 /* line control commands, which need to be executed immediately,
759 are not put into the buffer for obvious reasons.
760 */
761 if (priv->cmd_ctrl) {
762 count = 0;
763 goto finish;
764 }
765
766 if (!count)
767 return count;
768
769 spin_lock_irqsave(&priv->lock, flags);
770 count = cypress_buf_put(priv->buf, buf, count);
771 spin_unlock_irqrestore(&priv->lock, flags);
772
773 finish:
774 cypress_send(port);
775
776 return count;
777 } /* cypress_write */
778
779
780 static void cypress_send(struct usb_serial_port *port)
781 {
782 int count = 0, result, offset, actual_size;
783 struct cypress_private *priv = usb_get_serial_port_data(port);
784 unsigned long flags;
785
786 if (!priv->comm_is_ok)
787 return;
788
789 dbg("%s - port %d", __FUNCTION__, port->number);
790 dbg("%s - interrupt out size is %d", __FUNCTION__, port->interrupt_out_size);
791
792 spin_lock_irqsave(&priv->lock, flags);
793 if (priv->write_urb_in_use) {
794 dbg("%s - can't write, urb in use", __FUNCTION__);
795 spin_unlock_irqrestore(&priv->lock, flags);
796 return;
797 }
798 spin_unlock_irqrestore(&priv->lock, flags);
799
800 /* clear buffer */
801 memset(port->interrupt_out_urb->transfer_buffer, 0, port->interrupt_out_size);
802
803 spin_lock_irqsave(&priv->lock, flags);
804 switch (port->interrupt_out_size) {
805 case 32:
806 /* this is for the CY7C64013... */
807 offset = 2;
808 port->interrupt_out_buffer[0] = priv->line_control;
809 break;
810 case 8:
811 /* this is for the CY7C63743... */
812 offset = 1;
813 port->interrupt_out_buffer[0] = priv->line_control;
814 break;
815 default:
816 dbg("%s - wrong packet size", __FUNCTION__);
817 spin_unlock_irqrestore(&priv->lock, flags);
818 return;
819 }
820
821 if (priv->line_control & CONTROL_RESET)
822 priv->line_control &= ~CONTROL_RESET;
823
824 if (priv->cmd_ctrl) {
825 priv->cmd_count++;
826 dbg("%s - line control command being issued", __FUNCTION__);
827 spin_unlock_irqrestore(&priv->lock, flags);
828 goto send;
829 } else
830 spin_unlock_irqrestore(&priv->lock, flags);
831
832 count = cypress_buf_get(priv->buf, &port->interrupt_out_buffer[offset],
833 port->interrupt_out_size-offset);
834
835 if (count == 0) {
836 return;
837 }
838
839 switch (port->interrupt_out_size) {
840 case 32:
841 port->interrupt_out_buffer[1] = count;
842 break;
843 case 8:
844 port->interrupt_out_buffer[0] |= count;
845 }
846
847 dbg("%s - count is %d", __FUNCTION__, count);
848
849 send:
850 spin_lock_irqsave(&priv->lock, flags);
851 priv->write_urb_in_use = 1;
852 spin_unlock_irqrestore(&priv->lock, flags);
853
854 if (priv->cmd_ctrl)
855 actual_size = 1;
856 else
857 actual_size = count + (port->interrupt_out_size == 32 ? 2 : 1);
858
859 usb_serial_debug_data(debug, &port->dev, __FUNCTION__, port->interrupt_out_size,
860 port->interrupt_out_urb->transfer_buffer);
861
862 usb_fill_int_urb(port->interrupt_out_urb, port->serial->dev,
863 usb_sndintpipe(port->serial->dev, port->interrupt_out_endpointAddress),
864 port->interrupt_out_buffer, port->interrupt_out_size,
865 cypress_write_int_callback, port, priv->write_urb_interval);
866 result = usb_submit_urb (port->interrupt_out_urb, GFP_ATOMIC);
867 if (result) {
868 dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __FUNCTION__,
869 result);
870 priv->write_urb_in_use = 0;
871 cypress_set_dead(port);
872 }
873
874 spin_lock_irqsave(&priv->lock, flags);
875 if (priv->cmd_ctrl) {
876 priv->cmd_ctrl = 0;
877 }
878 priv->bytes_out += count; /* do not count the line control and size bytes */
879 spin_unlock_irqrestore(&priv->lock, flags);
880
881 usb_serial_port_softint(port);
882 } /* cypress_send */
883
884
885 /* returns how much space is available in the soft buffer */
886 static int cypress_write_room(struct usb_serial_port *port)
887 {
888 struct cypress_private *priv = usb_get_serial_port_data(port);
889 int room = 0;
890 unsigned long flags;
891
892 dbg("%s - port %d", __FUNCTION__, port->number);
893
894 spin_lock_irqsave(&priv->lock, flags);
895 room = cypress_buf_space_avail(priv->buf);
896 spin_unlock_irqrestore(&priv->lock, flags);
897
898 dbg("%s - returns %d", __FUNCTION__, room);
899 return room;
900 }
901
902
903 static int cypress_tiocmget (struct usb_serial_port *port, struct file *file)
904 {
905 struct cypress_private *priv = usb_get_serial_port_data(port);
906 __u8 status, control;
907 unsigned int result = 0;
908 unsigned long flags;
909
910 dbg("%s - port %d", __FUNCTION__, port->number);
911
912 spin_lock_irqsave(&priv->lock, flags);
913 control = priv->line_control;
914 status = priv->current_status;
915 spin_unlock_irqrestore(&priv->lock, flags);
916
917 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
918 | ((control & CONTROL_RTS) ? TIOCM_RTS : 0)
919 | ((status & UART_CTS) ? TIOCM_CTS : 0)
920 | ((status & UART_DSR) ? TIOCM_DSR : 0)
921 | ((status & UART_RI) ? TIOCM_RI : 0)
922 | ((status & UART_CD) ? TIOCM_CD : 0);
923
924 dbg("%s - result = %x", __FUNCTION__, result);
925
926 return result;
927 }
928
929
930 static int cypress_tiocmset (struct usb_serial_port *port, struct file *file,
931 unsigned int set, unsigned int clear)
932 {
933 struct cypress_private *priv = usb_get_serial_port_data(port);
934 unsigned long flags;
935
936 dbg("%s - port %d", __FUNCTION__, port->number);
937
938 spin_lock_irqsave(&priv->lock, flags);
939 if (set & TIOCM_RTS)
940 priv->line_control |= CONTROL_RTS;
941 if (set & TIOCM_DTR)
942 priv->line_control |= CONTROL_DTR;
943 if (clear & TIOCM_RTS)
944 priv->line_control &= ~CONTROL_RTS;
945 if (clear & TIOCM_DTR)
946 priv->line_control &= ~CONTROL_DTR;
947 spin_unlock_irqrestore(&priv->lock, flags);
948
949 priv->cmd_ctrl = 1;
950 return cypress_write(port, NULL, 0);
951 }
952
953
954 static int cypress_ioctl (struct usb_serial_port *port, struct file * file, unsigned int cmd, unsigned long arg)
955 {
956 struct cypress_private *priv = usb_get_serial_port_data(port);
957
958 dbg("%s - port %d, cmd 0x%.4x", __FUNCTION__, port->number, cmd);
959
960 switch (cmd) {
961 case TIOCGSERIAL:
962 if (copy_to_user((void __user *)arg, port->tty->termios, sizeof(struct ktermios))) {
963 return -EFAULT;
964 }
965 return (0);
966 break;
967 case TIOCSSERIAL:
968 if (copy_from_user(port->tty->termios, (void __user *)arg, sizeof(struct ktermios))) {
969 return -EFAULT;
970 }
971 /* here we need to call cypress_set_termios to invoke the new settings */
972 cypress_set_termios(port, &priv->tmp_termios);
973 return (0);
974 break;
975 /* This code comes from drivers/char/serial.c and ftdi_sio.c */
976 case TIOCMIWAIT:
977 while (priv != NULL) {
978 interruptible_sleep_on(&priv->delta_msr_wait);
979 /* see if a signal did it */
980 if (signal_pending(current))
981 return -ERESTARTSYS;
982 else {
983 char diff = priv->diff_status;
984
985 if (diff == 0) {
986 return -EIO; /* no change => error */
987 }
988
989 /* consume all events */
990 priv->diff_status = 0;
991
992 /* return 0 if caller wanted to know about these bits */
993 if ( ((arg & TIOCM_RNG) && (diff & UART_RI)) ||
994 ((arg & TIOCM_DSR) && (diff & UART_DSR)) ||
995 ((arg & TIOCM_CD) && (diff & UART_CD)) ||
996 ((arg & TIOCM_CTS) && (diff & UART_CTS)) ) {
997 return 0;
998 }
999 /* otherwise caller can't care less about what happened,
1000 * and so we continue to wait for more events.
1001 */
1002 }
1003 }
1004 return 0;
1005 break;
1006 default:
1007 break;
1008 }
1009
1010 dbg("%s - arg not supported - it was 0x%04x - check include/asm/ioctls.h", __FUNCTION__, cmd);
1011
1012 return -ENOIOCTLCMD;
1013 } /* cypress_ioctl */
1014
1015
1016 static void cypress_set_termios (struct usb_serial_port *port,
1017 struct ktermios *old_termios)
1018 {
1019 struct cypress_private *priv = usb_get_serial_port_data(port);
1020 struct tty_struct *tty;
1021 int data_bits, stop_bits, parity_type, parity_enable;
1022 unsigned cflag, iflag, baud_mask;
1023 unsigned long flags;
1024 __u8 oldlines;
1025 int linechange = 0;
1026
1027 dbg("%s - port %d", __FUNCTION__, port->number);
1028
1029 tty = port->tty;
1030 if ((!tty) || (!tty->termios)) {
1031 dbg("%s - no tty structures", __FUNCTION__);
1032 return;
1033 }
1034
1035 spin_lock_irqsave(&priv->lock, flags);
1036 if (!priv->termios_initialized) {
1037 if (priv->chiptype == CT_EARTHMATE) {
1038 *(tty->termios) = tty_std_termios;
1039 tty->termios->c_cflag = B4800 | CS8 | CREAD | HUPCL |
1040 CLOCAL;
1041 } else if (priv->chiptype == CT_CYPHIDCOM) {
1042 *(tty->termios) = tty_std_termios;
1043 tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL |
1044 CLOCAL;
1045 } else if (priv->chiptype == CT_CA42V2) {
1046 *(tty->termios) = tty_std_termios;
1047 tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL |
1048 CLOCAL;
1049 }
1050 priv->termios_initialized = 1;
1051 }
1052 spin_unlock_irqrestore(&priv->lock, flags);
1053
1054 cflag = tty->termios->c_cflag;
1055 iflag = tty->termios->c_iflag;
1056
1057 /* check if there are new settings */
1058 if (old_termios) {
1059 if ((cflag != old_termios->c_cflag) ||
1060 (RELEVANT_IFLAG(iflag) !=
1061 RELEVANT_IFLAG(old_termios->c_iflag))) {
1062 dbg("%s - attempting to set new termios settings",
1063 __FUNCTION__);
1064 /* should make a copy of this in case something goes
1065 * wrong in the function, we can restore it */
1066 spin_lock_irqsave(&priv->lock, flags);
1067 priv->tmp_termios = *(tty->termios);
1068 spin_unlock_irqrestore(&priv->lock, flags);
1069 } else {
1070 dbg("%s - nothing to do, exiting", __FUNCTION__);
1071 return;
1072 }
1073 } else
1074 return;
1075
1076 /* set number of data bits, parity, stop bits */
1077 /* when parity is disabled the parity type bit is ignored */
1078
1079 /* 1 means 2 stop bits, 0 means 1 stop bit */
1080 stop_bits = cflag & CSTOPB ? 1 : 0;
1081
1082 if (cflag & PARENB) {
1083 parity_enable = 1;
1084 /* 1 means odd parity, 0 means even parity */
1085 parity_type = cflag & PARODD ? 1 : 0;
1086 } else
1087 parity_enable = parity_type = 0;
1088
1089 if (cflag & CSIZE) {
1090 switch (cflag & CSIZE) {
1091 case CS5:
1092 data_bits = 0;
1093 break;
1094 case CS6:
1095 data_bits = 1;
1096 break;
1097 case CS7:
1098 data_bits = 2;
1099 break;
1100 case CS8:
1101 data_bits = 3;
1102 break;
1103 default:
1104 err("%s - CSIZE was set, but not CS5-CS8",
1105 __FUNCTION__);
1106 data_bits = 3;
1107 }
1108 } else
1109 data_bits = 3;
1110
1111 spin_lock_irqsave(&priv->lock, flags);
1112 oldlines = priv->line_control;
1113 if ((cflag & CBAUD) == B0) {
1114 /* drop dtr and rts */
1115 dbg("%s - dropping the lines, baud rate 0bps", __FUNCTION__);
1116 baud_mask = B0;
1117 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
1118 } else {
1119 baud_mask = (cflag & CBAUD);
1120 switch(baud_mask) {
1121 case B300:
1122 dbg("%s - setting baud 300bps", __FUNCTION__);
1123 break;
1124 case B600:
1125 dbg("%s - setting baud 600bps", __FUNCTION__);
1126 break;
1127 case B1200:
1128 dbg("%s - setting baud 1200bps", __FUNCTION__);
1129 break;
1130 case B2400:
1131 dbg("%s - setting baud 2400bps", __FUNCTION__);
1132 break;
1133 case B4800:
1134 dbg("%s - setting baud 4800bps", __FUNCTION__);
1135 break;
1136 case B9600:
1137 dbg("%s - setting baud 9600bps", __FUNCTION__);
1138 break;
1139 case B19200:
1140 dbg("%s - setting baud 19200bps", __FUNCTION__);
1141 break;
1142 case B38400:
1143 dbg("%s - setting baud 38400bps", __FUNCTION__);
1144 break;
1145 case B57600:
1146 dbg("%s - setting baud 57600bps", __FUNCTION__);
1147 break;
1148 case B115200:
1149 dbg("%s - setting baud 115200bps", __FUNCTION__);
1150 break;
1151 default:
1152 dbg("%s - unknown masked baud rate", __FUNCTION__);
1153 }
1154 priv->line_control = (CONTROL_DTR | CONTROL_RTS);
1155 }
1156 spin_unlock_irqrestore(&priv->lock, flags);
1157
1158 dbg("%s - sending %d stop_bits, %d parity_enable, %d parity_type, "
1159 "%d data_bits (+5)", __FUNCTION__, stop_bits,
1160 parity_enable, parity_type, data_bits);
1161
1162 cypress_serial_control(port, baud_mask, data_bits, stop_bits,
1163 parity_enable, parity_type, 0, CYPRESS_SET_CONFIG);
1164
1165 /* we perform a CYPRESS_GET_CONFIG so that the current settings are
1166 * filled into the private structure this should confirm that all is
1167 * working if it returns what we just set */
1168 cypress_serial_control(port, 0, 0, 0, 0, 0, 0, CYPRESS_GET_CONFIG);
1169
1170 /* Here we can define custom tty settings for devices; the main tty
1171 * termios flag base comes from empeg.c */
1172
1173 spin_lock_irqsave(&priv->lock, flags);
1174 if ( (priv->chiptype == CT_EARTHMATE) && (priv->baud_rate == 4800) ) {
1175 dbg("Using custom termios settings for a baud rate of "
1176 "4800bps.");
1177 /* define custom termios settings for NMEA protocol */
1178
1179 tty->termios->c_iflag /* input modes - */
1180 &= ~(IGNBRK /* disable ignore break */
1181 | BRKINT /* disable break causes interrupt */
1182 | PARMRK /* disable mark parity errors */
1183 | ISTRIP /* disable clear high bit of input char */
1184 | INLCR /* disable translate NL to CR */
1185 | IGNCR /* disable ignore CR */
1186 | ICRNL /* disable translate CR to NL */
1187 | IXON); /* disable enable XON/XOFF flow control */
1188
1189 tty->termios->c_oflag /* output modes */
1190 &= ~OPOST; /* disable postprocess output char */
1191
1192 tty->termios->c_lflag /* line discipline modes */
1193 &= ~(ECHO /* disable echo input characters */
1194 | ECHONL /* disable echo new line */
1195 | ICANON /* disable erase, kill, werase, and rprnt
1196 special characters */
1197 | ISIG /* disable interrupt, quit, and suspend
1198 special characters */
1199 | IEXTEN); /* disable non-POSIX special characters */
1200 } /* CT_CYPHIDCOM: Application should handle this for device */
1201
1202 linechange = (priv->line_control != oldlines);
1203 spin_unlock_irqrestore(&priv->lock, flags);
1204
1205 /* if necessary, set lines */
1206 if (linechange) {
1207 priv->cmd_ctrl = 1;
1208 cypress_write(port, NULL, 0);
1209 }
1210 } /* cypress_set_termios */
1211
1212
1213 /* returns amount of data still left in soft buffer */
1214 static int cypress_chars_in_buffer(struct usb_serial_port *port)
1215 {
1216 struct cypress_private *priv = usb_get_serial_port_data(port);
1217 int chars = 0;
1218 unsigned long flags;
1219
1220 dbg("%s - port %d", __FUNCTION__, port->number);
1221
1222 spin_lock_irqsave(&priv->lock, flags);
1223 chars = cypress_buf_data_avail(priv->buf);
1224 spin_unlock_irqrestore(&priv->lock, flags);
1225
1226 dbg("%s - returns %d", __FUNCTION__, chars);
1227 return chars;
1228 }
1229
1230
1231 static void cypress_throttle (struct usb_serial_port *port)
1232 {
1233 struct cypress_private *priv = usb_get_serial_port_data(port);
1234 unsigned long flags;
1235
1236 dbg("%s - port %d", __FUNCTION__, port->number);
1237
1238 spin_lock_irqsave(&priv->lock, flags);
1239 priv->rx_flags = THROTTLED;
1240 spin_unlock_irqrestore(&priv->lock, flags);
1241 }
1242
1243
1244 static void cypress_unthrottle (struct usb_serial_port *port)
1245 {
1246 struct cypress_private *priv = usb_get_serial_port_data(port);
1247 int actually_throttled, result;
1248 unsigned long flags;
1249
1250 dbg("%s - port %d", __FUNCTION__, port->number);
1251
1252 spin_lock_irqsave(&priv->lock, flags);
1253 actually_throttled = priv->rx_flags & ACTUALLY_THROTTLED;
1254 priv->rx_flags = 0;
1255 spin_unlock_irqrestore(&priv->lock, flags);
1256
1257 if (!priv->comm_is_ok)
1258 return;
1259
1260 if (actually_throttled) {
1261 port->interrupt_in_urb->dev = port->serial->dev;
1262
1263 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
1264 if (result) {
1265 dev_err(&port->dev, "%s - failed submitting read urb, "
1266 "error %d\n", __FUNCTION__, result);
1267 cypress_set_dead(port);
1268 }
1269 }
1270 }
1271
1272
1273 static void cypress_read_int_callback(struct urb *urb)
1274 {
1275 struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
1276 struct cypress_private *priv = usb_get_serial_port_data(port);
1277 struct tty_struct *tty;
1278 unsigned char *data = urb->transfer_buffer;
1279 unsigned long flags;
1280 char tty_flag = TTY_NORMAL;
1281 int havedata = 0;
1282 int bytes = 0;
1283 int result;
1284 int i = 0;
1285 int status = urb->status;
1286
1287 dbg("%s - port %d", __FUNCTION__, port->number);
1288
1289 switch (status) {
1290 case 0: /* success */
1291 break;
1292 case -ECONNRESET:
1293 case -ENOENT:
1294 case -ESHUTDOWN:
1295 /* precursor to disconnect so just go away */
1296 return;
1297 case -EPIPE:
1298 usb_clear_halt(port->serial->dev,0x81);
1299 break;
1300 default:
1301 /* something ugly is going on... */
1302 dev_err(&urb->dev->dev,"%s - unexpected nonzero read status received: %d\n",
1303 __FUNCTION__, status);
1304 cypress_set_dead(port);
1305 return;
1306 }
1307
1308 spin_lock_irqsave(&priv->lock, flags);
1309 if (priv->rx_flags & THROTTLED) {
1310 dbg("%s - now throttling", __FUNCTION__);
1311 priv->rx_flags |= ACTUALLY_THROTTLED;
1312 spin_unlock_irqrestore(&priv->lock, flags);
1313 return;
1314 }
1315 spin_unlock_irqrestore(&priv->lock, flags);
1316
1317 tty = port->tty;
1318 if (!tty) {
1319 dbg("%s - bad tty pointer - exiting", __FUNCTION__);
1320 return;
1321 }
1322
1323 spin_lock_irqsave(&priv->lock, flags);
1324 switch(urb->actual_length) {
1325 case 32:
1326 /* This is for the CY7C64013... */
1327 priv->current_status = data[0] & 0xF8;
1328 bytes = data[1] + 2;
1329 i = 2;
1330 if (bytes > 2)
1331 havedata = 1;
1332 break;
1333 case 8:
1334 /* This is for the CY7C63743... */
1335 priv->current_status = data[0] & 0xF8;
1336 bytes = (data[0] & 0x07) + 1;
1337 i = 1;
1338 if (bytes > 1)
1339 havedata = 1;
1340 break;
1341 default:
1342 dbg("%s - wrong packet size - received %d bytes",
1343 __FUNCTION__, urb->actual_length);
1344 spin_unlock_irqrestore(&priv->lock, flags);
1345 goto continue_read;
1346 }
1347 spin_unlock_irqrestore(&priv->lock, flags);
1348
1349 usb_serial_debug_data (debug, &port->dev, __FUNCTION__,
1350 urb->actual_length, data);
1351
1352 spin_lock_irqsave(&priv->lock, flags);
1353 /* check to see if status has changed */
1354 if (priv != NULL) {
1355 if (priv->current_status != priv->prev_status) {
1356 priv->diff_status |= priv->current_status ^
1357 priv->prev_status;
1358 wake_up_interruptible(&priv->delta_msr_wait);
1359 priv->prev_status = priv->current_status;
1360 }
1361 }
1362 spin_unlock_irqrestore(&priv->lock, flags);
1363
1364 /* hangup, as defined in acm.c... this might be a bad place for it
1365 * though */
1366 if (tty && !(tty->termios->c_cflag & CLOCAL) &&
1367 !(priv->current_status & UART_CD)) {
1368 dbg("%s - calling hangup", __FUNCTION__);
1369 tty_hangup(tty);
1370 goto continue_read;
1371 }
1372
1373 /* There is one error bit... I'm assuming it is a parity error
1374 * indicator as the generic firmware will set this bit to 1 if a
1375 * parity error occurs.
1376 * I can not find reference to any other error events. */
1377 spin_lock_irqsave(&priv->lock, flags);
1378 if (priv->current_status & CYP_ERROR) {
1379 spin_unlock_irqrestore(&priv->lock, flags);
1380 tty_flag = TTY_PARITY;
1381 dbg("%s - Parity Error detected", __FUNCTION__);
1382 } else
1383 spin_unlock_irqrestore(&priv->lock, flags);
1384
1385 /* process read if there is data other than line status */
1386 if (tty && (bytes > i)) {
1387 bytes = tty_buffer_request_room(tty, bytes);
1388 for (; i < bytes ; ++i) {
1389 dbg("pushing byte number %d - %d - %c", i, data[i],
1390 data[i]);
1391 tty_insert_flip_char(tty, data[i], tty_flag);
1392 }
1393 tty_flip_buffer_push(port->tty);
1394 }
1395
1396 spin_lock_irqsave(&priv->lock, flags);
1397 /* control and status byte(s) are also counted */
1398 priv->bytes_in += bytes;
1399 spin_unlock_irqrestore(&priv->lock, flags);
1400
1401 continue_read:
1402
1403 /* Continue trying to always read... unless the port has closed. */
1404
1405 if (port->open_count > 0 && priv->comm_is_ok) {
1406 usb_fill_int_urb(port->interrupt_in_urb, port->serial->dev,
1407 usb_rcvintpipe(port->serial->dev,
1408 port->interrupt_in_endpointAddress),
1409 port->interrupt_in_urb->transfer_buffer,
1410 port->interrupt_in_urb->transfer_buffer_length,
1411 cypress_read_int_callback, port, priv->read_urb_interval);
1412 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
1413 if (result) {
1414 dev_err(&urb->dev->dev, "%s - failed resubmitting "
1415 "read urb, error %d\n", __FUNCTION__,
1416 result);
1417 cypress_set_dead(port);
1418 }
1419 }
1420
1421 return;
1422 } /* cypress_read_int_callback */
1423
1424
1425 static void cypress_write_int_callback(struct urb *urb)
1426 {
1427 struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
1428 struct cypress_private *priv = usb_get_serial_port_data(port);
1429 int result;
1430 int status = urb->status;
1431
1432 dbg("%s - port %d", __FUNCTION__, port->number);
1433
1434 switch (status) {
1435 case 0:
1436 /* success */
1437 break;
1438 case -ECONNRESET:
1439 case -ENOENT:
1440 case -ESHUTDOWN:
1441 /* this urb is terminated, clean up */
1442 dbg("%s - urb shutting down with status: %d",
1443 __FUNCTION__, status);
1444 priv->write_urb_in_use = 0;
1445 return;
1446 case -EPIPE: /* no break needed; clear halt and resubmit */
1447 if (!priv->comm_is_ok)
1448 break;
1449 usb_clear_halt(port->serial->dev, 0x02);
1450 /* error in the urb, so we have to resubmit it */
1451 dbg("%s - nonzero write bulk status received: %d",
1452 __FUNCTION__, status);
1453 port->interrupt_out_urb->transfer_buffer_length = 1;
1454 port->interrupt_out_urb->dev = port->serial->dev;
1455 result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC);
1456 if (!result)
1457 return;
1458 dev_err(&urb->dev->dev, "%s - failed resubmitting write urb, error %d\n",
1459 __FUNCTION__, result);
1460 cypress_set_dead(port);
1461 break;
1462 default:
1463 dev_err(&urb->dev->dev,"%s - unexpected nonzero write status received: %d\n",
1464 __FUNCTION__, status);
1465 cypress_set_dead(port);
1466 break;
1467 }
1468
1469 priv->write_urb_in_use = 0;
1470
1471 /* send any buffered data */
1472 cypress_send(port);
1473 }
1474
1475
1476 /*****************************************************************************
1477 * Write buffer functions - buffering code from pl2303 used
1478 *****************************************************************************/
1479
1480 /*
1481 * cypress_buf_alloc
1482 *
1483 * Allocate a circular buffer and all associated memory.
1484 */
1485
1486 static struct cypress_buf *cypress_buf_alloc(unsigned int size)
1487 {
1488
1489 struct cypress_buf *cb;
1490
1491
1492 if (size == 0)
1493 return NULL;
1494
1495 cb = kmalloc(sizeof(struct cypress_buf), GFP_KERNEL);
1496 if (cb == NULL)
1497 return NULL;
1498
1499 cb->buf_buf = kmalloc(size, GFP_KERNEL);
1500 if (cb->buf_buf == NULL) {
1501 kfree(cb);
1502 return NULL;
1503 }
1504
1505 cb->buf_size = size;
1506 cb->buf_get = cb->buf_put = cb->buf_buf;
1507
1508 return cb;
1509
1510 }
1511
1512
1513 /*
1514 * cypress_buf_free
1515 *
1516 * Free the buffer and all associated memory.
1517 */
1518
1519 static void cypress_buf_free(struct cypress_buf *cb)
1520 {
1521 if (cb) {
1522 kfree(cb->buf_buf);
1523 kfree(cb);
1524 }
1525 }
1526
1527
1528 /*
1529 * cypress_buf_clear
1530 *
1531 * Clear out all data in the circular buffer.
1532 */
1533
1534 static void cypress_buf_clear(struct cypress_buf *cb)
1535 {
1536 if (cb != NULL)
1537 cb->buf_get = cb->buf_put;
1538 /* equivalent to a get of all data available */
1539 }
1540
1541
1542 /*
1543 * cypress_buf_data_avail
1544 *
1545 * Return the number of bytes of data available in the circular
1546 * buffer.
1547 */
1548
1549 static unsigned int cypress_buf_data_avail(struct cypress_buf *cb)
1550 {
1551 if (cb != NULL)
1552 return ((cb->buf_size + cb->buf_put - cb->buf_get) % cb->buf_size);
1553 else
1554 return 0;
1555 }
1556
1557
1558 /*
1559 * cypress_buf_space_avail
1560 *
1561 * Return the number of bytes of space available in the circular
1562 * buffer.
1563 */
1564
1565 static unsigned int cypress_buf_space_avail(struct cypress_buf *cb)
1566 {
1567 if (cb != NULL)
1568 return ((cb->buf_size + cb->buf_get - cb->buf_put - 1) % cb->buf_size);
1569 else
1570 return 0;
1571 }
1572
1573
1574 /*
1575 * cypress_buf_put
1576 *
1577 * Copy data data from a user buffer and put it into the circular buffer.
1578 * Restrict to the amount of space available.
1579 *
1580 * Return the number of bytes copied.
1581 */
1582
1583 static unsigned int cypress_buf_put(struct cypress_buf *cb, const char *buf,
1584 unsigned int count)
1585 {
1586
1587 unsigned int len;
1588
1589
1590 if (cb == NULL)
1591 return 0;
1592
1593 len = cypress_buf_space_avail(cb);
1594 if (count > len)
1595 count = len;
1596
1597 if (count == 0)
1598 return 0;
1599
1600 len = cb->buf_buf + cb->buf_size - cb->buf_put;
1601 if (count > len) {
1602 memcpy(cb->buf_put, buf, len);
1603 memcpy(cb->buf_buf, buf+len, count - len);
1604 cb->buf_put = cb->buf_buf + count - len;
1605 } else {
1606 memcpy(cb->buf_put, buf, count);
1607 if (count < len)
1608 cb->buf_put += count;
1609 else /* count == len */
1610 cb->buf_put = cb->buf_buf;
1611 }
1612
1613 return count;
1614
1615 }
1616
1617
1618 /*
1619 * cypress_buf_get
1620 *
1621 * Get data from the circular buffer and copy to the given buffer.
1622 * Restrict to the amount of data available.
1623 *
1624 * Return the number of bytes copied.
1625 */
1626
1627 static unsigned int cypress_buf_get(struct cypress_buf *cb, char *buf,
1628 unsigned int count)
1629 {
1630
1631 unsigned int len;
1632
1633
1634 if (cb == NULL)
1635 return 0;
1636
1637 len = cypress_buf_data_avail(cb);
1638 if (count > len)
1639 count = len;
1640
1641 if (count == 0)
1642 return 0;
1643
1644 len = cb->buf_buf + cb->buf_size - cb->buf_get;
1645 if (count > len) {
1646 memcpy(buf, cb->buf_get, len);
1647 memcpy(buf+len, cb->buf_buf, count - len);
1648 cb->buf_get = cb->buf_buf + count - len;
1649 } else {
1650 memcpy(buf, cb->buf_get, count);
1651 if (count < len)
1652 cb->buf_get += count;
1653 else /* count == len */
1654 cb->buf_get = cb->buf_buf;
1655 }
1656
1657 return count;
1658
1659 }
1660
1661 /*****************************************************************************
1662 * Module functions
1663 *****************************************************************************/
1664
1665 static int __init cypress_init(void)
1666 {
1667 int retval;
1668
1669 dbg("%s", __FUNCTION__);
1670
1671 retval = usb_serial_register(&cypress_earthmate_device);
1672 if (retval)
1673 goto failed_em_register;
1674 retval = usb_serial_register(&cypress_hidcom_device);
1675 if (retval)
1676 goto failed_hidcom_register;
1677 retval = usb_serial_register(&cypress_ca42v2_device);
1678 if (retval)
1679 goto failed_ca42v2_register;
1680 retval = usb_register(&cypress_driver);
1681 if (retval)
1682 goto failed_usb_register;
1683
1684 info(DRIVER_DESC " " DRIVER_VERSION);
1685 return 0;
1686
1687 failed_usb_register:
1688 usb_serial_deregister(&cypress_ca42v2_device);
1689 failed_ca42v2_register:
1690 usb_serial_deregister(&cypress_hidcom_device);
1691 failed_hidcom_register:
1692 usb_serial_deregister(&cypress_earthmate_device);
1693 failed_em_register:
1694 return retval;
1695 }
1696
1697
1698 static void __exit cypress_exit (void)
1699 {
1700 dbg("%s", __FUNCTION__);
1701
1702 usb_deregister (&cypress_driver);
1703 usb_serial_deregister (&cypress_earthmate_device);
1704 usb_serial_deregister (&cypress_hidcom_device);
1705 usb_serial_deregister (&cypress_ca42v2_device);
1706 }
1707
1708
1709 module_init(cypress_init);
1710 module_exit(cypress_exit);
1711
1712 MODULE_AUTHOR( DRIVER_AUTHOR );
1713 MODULE_DESCRIPTION( DRIVER_DESC );
1714 MODULE_VERSION( DRIVER_VERSION );
1715 MODULE_LICENSE("GPL");
1716
1717 module_param(debug, bool, S_IRUGO | S_IWUSR);
1718 MODULE_PARM_DESC(debug, "Debug enabled or not");
1719 module_param(stats, bool, S_IRUGO | S_IWUSR);
1720 MODULE_PARM_DESC(stats, "Enable statistics or not");
1721 module_param(interval, int, S_IRUGO | S_IWUSR);
1722 MODULE_PARM_DESC(interval, "Overrides interrupt interval");
WRT350N Kernel Patches