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[PATCH] Remove unnecessary memset(0) calls after kzalloc() calls.
[linux-2.6/mini2440.git] / drivers / usb / serial / cypress_m8.c
blob57b8e27285fc007dda4805d0447d51fb0096e43a
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 unsigned long flags;
686 int bps;
687 long timeout;
688 wait_queue_t wait;
689
690 dbg("%s - port %d", __FUNCTION__, port->number);
691
692 /* wait for data to drain from buffer */
693 spin_lock_irqsave(&priv->lock, flags);
694 timeout = CYPRESS_CLOSING_WAIT;
695 init_waitqueue_entry(&wait, current);
696 add_wait_queue(&port->tty->write_wait, &wait);
697 for (;;) {
698 set_current_state(TASK_INTERRUPTIBLE);
699 if (cypress_buf_data_avail(priv->buf) == 0
700 || timeout == 0 || signal_pending(current)
701 || !usb_get_intfdata(port->serial->interface))
702 break;
703 spin_unlock_irqrestore(&priv->lock, flags);
704 timeout = schedule_timeout(timeout);
705 spin_lock_irqsave(&priv->lock, flags);
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_irqrestore(&priv->lock, flags);
712
713 /* wait for characters to drain from device */
714 bps = tty_get_baud_rate(port->tty);
715 if (bps > 1200)
716 timeout = max((HZ*2560)/bps,HZ/10);
717 else
718 timeout = 2*HZ;
719 schedule_timeout_interruptible(timeout);
720
721 dbg("%s - stopping urbs", __FUNCTION__);
722 usb_kill_urb (port->interrupt_in_urb);
723 usb_kill_urb (port->interrupt_out_urb);
724
725 if (port->tty) {
726 c_cflag = port->tty->termios->c_cflag;
727 if (c_cflag & HUPCL) {
728 /* drop dtr and rts */
729 priv = usb_get_serial_port_data(port);
730 spin_lock_irqsave(&priv->lock, flags);
731 priv->line_control = 0;
732 priv->cmd_ctrl = 1;
733 spin_unlock_irqrestore(&priv->lock, flags);
734 cypress_write(port, NULL, 0);
735 }
736 }
737
738 if (stats)
739 dev_info (&port->dev, "Statistics: %d Bytes In | %d Bytes Out | %d Commands Issued\n",
740 priv->bytes_in, priv->bytes_out, priv->cmd_count);
741 } /* cypress_close */
742
743
744 static int cypress_write(struct usb_serial_port *port, const unsigned char *buf, int count)
745 {
746 struct cypress_private *priv = usb_get_serial_port_data(port);
747 unsigned long flags;
748
749 dbg("%s - port %d, %d bytes", __FUNCTION__, port->number, count);
750
751 /* line control commands, which need to be executed immediately,
752 are not put into the buffer for obvious reasons.
753 */
754 if (priv->cmd_ctrl) {
755 count = 0;
756 goto finish;
757 }
758
759 if (!count)
760 return count;
761
762 spin_lock_irqsave(&priv->lock, flags);
763 count = cypress_buf_put(priv->buf, buf, count);
764 spin_unlock_irqrestore(&priv->lock, flags);
765
766 finish:
767 cypress_send(port);
768
769 return count;
770 } /* cypress_write */
771
772
773 static void cypress_send(struct usb_serial_port *port)
774 {
775 int count = 0, result, offset, actual_size;
776 struct cypress_private *priv = usb_get_serial_port_data(port);
777 unsigned long flags;
778
779 if (!priv->comm_is_ok)
780 return;
781
782 dbg("%s - port %d", __FUNCTION__, port->number);
783 dbg("%s - interrupt out size is %d", __FUNCTION__, port->interrupt_out_size);
784
785 spin_lock_irqsave(&priv->lock, flags);
786 if (priv->write_urb_in_use) {
787 dbg("%s - can't write, urb in use", __FUNCTION__);
788 spin_unlock_irqrestore(&priv->lock, flags);
789 return;
790 }
791 spin_unlock_irqrestore(&priv->lock, flags);
792
793 /* clear buffer */
794 memset(port->interrupt_out_urb->transfer_buffer, 0, port->interrupt_out_size);
795
796 spin_lock_irqsave(&priv->lock, flags);
797 switch (port->interrupt_out_size) {
798 case 32:
799 /* this is for the CY7C64013... */
800 offset = 2;
801 port->interrupt_out_buffer[0] = priv->line_control;
802 break;
803 case 8:
804 /* this is for the CY7C63743... */
805 offset = 1;
806 port->interrupt_out_buffer[0] = priv->line_control;
807 break;
808 default:
809 dbg("%s - wrong packet size", __FUNCTION__);
810 spin_unlock_irqrestore(&priv->lock, flags);
811 return;
812 }
813
814 if (priv->line_control & CONTROL_RESET)
815 priv->line_control &= ~CONTROL_RESET;
816
817 if (priv->cmd_ctrl) {
818 priv->cmd_count++;
819 dbg("%s - line control command being issued", __FUNCTION__);
820 spin_unlock_irqrestore(&priv->lock, flags);
821 goto send;
822 } else
823 spin_unlock_irqrestore(&priv->lock, flags);
824
825 count = cypress_buf_get(priv->buf, &port->interrupt_out_buffer[offset],
826 port->interrupt_out_size-offset);
827
828 if (count == 0) {
829 return;
830 }
831
832 switch (port->interrupt_out_size) {
833 case 32:
834 port->interrupt_out_buffer[1] = count;
835 break;
836 case 8:
837 port->interrupt_out_buffer[0] |= count;
838 }
839
840 dbg("%s - count is %d", __FUNCTION__, count);
841
842 send:
843 spin_lock_irqsave(&priv->lock, flags);
844 priv->write_urb_in_use = 1;
845 spin_unlock_irqrestore(&priv->lock, flags);
846
847 if (priv->cmd_ctrl)
848 actual_size = 1;
849 else
850 actual_size = count + (port->interrupt_out_size == 32 ? 2 : 1);
851
852 usb_serial_debug_data(debug, &port->dev, __FUNCTION__, port->interrupt_out_size,
853 port->interrupt_out_urb->transfer_buffer);
854
855 usb_fill_int_urb(port->interrupt_out_urb, port->serial->dev,
856 usb_sndintpipe(port->serial->dev, port->interrupt_out_endpointAddress),
857 port->interrupt_out_buffer, port->interrupt_out_size,
858 cypress_write_int_callback, port, priv->write_urb_interval);
859 result = usb_submit_urb (port->interrupt_out_urb, GFP_ATOMIC);
860 if (result) {
861 dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __FUNCTION__,
862 result);
863 priv->write_urb_in_use = 0;
864 cypress_set_dead(port);
865 }
866
867 spin_lock_irqsave(&priv->lock, flags);
868 if (priv->cmd_ctrl) {
869 priv->cmd_ctrl = 0;
870 }
871 priv->bytes_out += count; /* do not count the line control and size bytes */
872 spin_unlock_irqrestore(&priv->lock, flags);
873
874 usb_serial_port_softint(port);
875 } /* cypress_send */
876
877
878 /* returns how much space is available in the soft buffer */
879 static int cypress_write_room(struct usb_serial_port *port)
880 {
881 struct cypress_private *priv = usb_get_serial_port_data(port);
882 int room = 0;
883 unsigned long flags;
884
885 dbg("%s - port %d", __FUNCTION__, port->number);
886
887 spin_lock_irqsave(&priv->lock, flags);
888 room = cypress_buf_space_avail(priv->buf);
889 spin_unlock_irqrestore(&priv->lock, flags);
890
891 dbg("%s - returns %d", __FUNCTION__, room);
892 return room;
893 }
894
895
896 static int cypress_tiocmget (struct usb_serial_port *port, struct file *file)
897 {
898 struct cypress_private *priv = usb_get_serial_port_data(port);
899 __u8 status, control;
900 unsigned int result = 0;
901 unsigned long flags;
902
903 dbg("%s - port %d", __FUNCTION__, port->number);
904
905 spin_lock_irqsave(&priv->lock, flags);
906 control = priv->line_control;
907 status = priv->current_status;
908 spin_unlock_irqrestore(&priv->lock, flags);
909
910 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
911 | ((control & CONTROL_RTS) ? TIOCM_RTS : 0)
912 | ((status & UART_CTS) ? TIOCM_CTS : 0)
913 | ((status & UART_DSR) ? TIOCM_DSR : 0)
914 | ((status & UART_RI) ? TIOCM_RI : 0)
915 | ((status & UART_CD) ? TIOCM_CD : 0);
916
917 dbg("%s - result = %x", __FUNCTION__, result);
918
919 return result;
920 }
921
922
923 static int cypress_tiocmset (struct usb_serial_port *port, struct file *file,
924 unsigned int set, unsigned int clear)
925 {
926 struct cypress_private *priv = usb_get_serial_port_data(port);
927 unsigned long flags;
928
929 dbg("%s - port %d", __FUNCTION__, port->number);
930
931 spin_lock_irqsave(&priv->lock, flags);
932 if (set & TIOCM_RTS)
933 priv->line_control |= CONTROL_RTS;
934 if (set & TIOCM_DTR)
935 priv->line_control |= CONTROL_DTR;
936 if (clear & TIOCM_RTS)
937 priv->line_control &= ~CONTROL_RTS;
938 if (clear & TIOCM_DTR)
939 priv->line_control &= ~CONTROL_DTR;
940 spin_unlock_irqrestore(&priv->lock, flags);
941
942 priv->cmd_ctrl = 1;
943 return cypress_write(port, NULL, 0);
944 }
945
946
947 static int cypress_ioctl (struct usb_serial_port *port, struct file * file, unsigned int cmd, unsigned long arg)
948 {
949 struct cypress_private *priv = usb_get_serial_port_data(port);
950
951 dbg("%s - port %d, cmd 0x%.4x", __FUNCTION__, port->number, cmd);
952
953 switch (cmd) {
954 case TIOCGSERIAL:
955 if (copy_to_user((void __user *)arg, port->tty->termios, sizeof(struct ktermios))) {
956 return -EFAULT;
957 }
958 return (0);
959 break;
960 case TIOCSSERIAL:
961 if (copy_from_user(port->tty->termios, (void __user *)arg, sizeof(struct ktermios))) {
962 return -EFAULT;
963 }
964 /* here we need to call cypress_set_termios to invoke the new settings */
965 cypress_set_termios(port, &priv->tmp_termios);
966 return (0);
967 break;
968 /* This code comes from drivers/char/serial.c and ftdi_sio.c */
969 case TIOCMIWAIT:
970 while (priv != NULL) {
971 interruptible_sleep_on(&priv->delta_msr_wait);
972 /* see if a signal did it */
973 if (signal_pending(current))
974 return -ERESTARTSYS;
975 else {
976 char diff = priv->diff_status;
977
978 if (diff == 0) {
979 return -EIO; /* no change => error */
980 }
981
982 /* consume all events */
983 priv->diff_status = 0;
984
985 /* return 0 if caller wanted to know about these bits */
986 if ( ((arg & TIOCM_RNG) && (diff & UART_RI)) ||
987 ((arg & TIOCM_DSR) && (diff & UART_DSR)) ||
988 ((arg & TIOCM_CD) && (diff & UART_CD)) ||
989 ((arg & TIOCM_CTS) && (diff & UART_CTS)) ) {
990 return 0;
991 }
992 /* otherwise caller can't care less about what happened,
993 * and so we continue to wait for more events.
994 */
995 }
996 }
997 return 0;
998 break;
999 default:
1000 break;
1001 }
1002
1003 dbg("%s - arg not supported - it was 0x%04x - check include/asm/ioctls.h", __FUNCTION__, cmd);
1004
1005 return -ENOIOCTLCMD;
1006 } /* cypress_ioctl */
1007
1008
1009 static void cypress_set_termios (struct usb_serial_port *port,
1010 struct ktermios *old_termios)
1011 {
1012 struct cypress_private *priv = usb_get_serial_port_data(port);
1013 struct tty_struct *tty;
1014 int data_bits, stop_bits, parity_type, parity_enable;
1015 unsigned cflag, iflag, baud_mask;
1016 unsigned long flags;
1017 __u8 oldlines;
1018 int linechange = 0;
1019
1020 dbg("%s - port %d", __FUNCTION__, port->number);
1021
1022 tty = port->tty;
1023 if ((!tty) || (!tty->termios)) {
1024 dbg("%s - no tty structures", __FUNCTION__);
1025 return;
1026 }
1027
1028 spin_lock_irqsave(&priv->lock, flags);
1029 if (!priv->termios_initialized) {
1030 if (priv->chiptype == CT_EARTHMATE) {
1031 *(tty->termios) = tty_std_termios;
1032 tty->termios->c_cflag = B4800 | CS8 | CREAD | HUPCL |
1033 CLOCAL;
1034 } else if (priv->chiptype == CT_CYPHIDCOM) {
1035 *(tty->termios) = tty_std_termios;
1036 tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL |
1037 CLOCAL;
1038 } else if (priv->chiptype == CT_CA42V2) {
1039 *(tty->termios) = tty_std_termios;
1040 tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL |
1041 CLOCAL;
1042 }
1043 priv->termios_initialized = 1;
1044 }
1045 spin_unlock_irqrestore(&priv->lock, flags);
1046
1047 cflag = tty->termios->c_cflag;
1048 iflag = tty->termios->c_iflag;
1049
1050 /* check if there are new settings */
1051 if (old_termios) {
1052 if ((cflag != old_termios->c_cflag) ||
1053 (RELEVANT_IFLAG(iflag) !=
1054 RELEVANT_IFLAG(old_termios->c_iflag))) {
1055 dbg("%s - attempting to set new termios settings",
1056 __FUNCTION__);
1057 /* should make a copy of this in case something goes
1058 * wrong in the function, we can restore it */
1059 spin_lock_irqsave(&priv->lock, flags);
1060 priv->tmp_termios = *(tty->termios);
1061 spin_unlock_irqrestore(&priv->lock, flags);
1062 } else {
1063 dbg("%s - nothing to do, exiting", __FUNCTION__);
1064 return;
1065 }
1066 } else
1067 return;
1068
1069 /* set number of data bits, parity, stop bits */
1070 /* when parity is disabled the parity type bit is ignored */
1071
1072 /* 1 means 2 stop bits, 0 means 1 stop bit */
1073 stop_bits = cflag & CSTOPB ? 1 : 0;
1074
1075 if (cflag & PARENB) {
1076 parity_enable = 1;
1077 /* 1 means odd parity, 0 means even parity */
1078 parity_type = cflag & PARODD ? 1 : 0;
1079 } else
1080 parity_enable = parity_type = 0;
1081
1082 if (cflag & CSIZE) {
1083 switch (cflag & CSIZE) {
1084 case CS5:
1085 data_bits = 0;
1086 break;
1087 case CS6:
1088 data_bits = 1;
1089 break;
1090 case CS7:
1091 data_bits = 2;
1092 break;
1093 case CS8:
1094 data_bits = 3;
1095 break;
1096 default:
1097 err("%s - CSIZE was set, but not CS5-CS8",
1098 __FUNCTION__);
1099 data_bits = 3;
1100 }
1101 } else
1102 data_bits = 3;
1103
1104 spin_lock_irqsave(&priv->lock, flags);
1105 oldlines = priv->line_control;
1106 if ((cflag & CBAUD) == B0) {
1107 /* drop dtr and rts */
1108 dbg("%s - dropping the lines, baud rate 0bps", __FUNCTION__);
1109 baud_mask = B0;
1110 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
1111 } else {
1112 baud_mask = (cflag & CBAUD);
1113 switch(baud_mask) {
1114 case B300:
1115 dbg("%s - setting baud 300bps", __FUNCTION__);
1116 break;
1117 case B600:
1118 dbg("%s - setting baud 600bps", __FUNCTION__);
1119 break;
1120 case B1200:
1121 dbg("%s - setting baud 1200bps", __FUNCTION__);
1122 break;
1123 case B2400:
1124 dbg("%s - setting baud 2400bps", __FUNCTION__);
1125 break;
1126 case B4800:
1127 dbg("%s - setting baud 4800bps", __FUNCTION__);
1128 break;
1129 case B9600:
1130 dbg("%s - setting baud 9600bps", __FUNCTION__);
1131 break;
1132 case B19200:
1133 dbg("%s - setting baud 19200bps", __FUNCTION__);
1134 break;
1135 case B38400:
1136 dbg("%s - setting baud 38400bps", __FUNCTION__);
1137 break;
1138 case B57600:
1139 dbg("%s - setting baud 57600bps", __FUNCTION__);
1140 break;
1141 case B115200:
1142 dbg("%s - setting baud 115200bps", __FUNCTION__);
1143 break;
1144 default:
1145 dbg("%s - unknown masked baud rate", __FUNCTION__);
1146 }
1147 priv->line_control = (CONTROL_DTR | CONTROL_RTS);
1148 }
1149 spin_unlock_irqrestore(&priv->lock, flags);
1150
1151 dbg("%s - sending %d stop_bits, %d parity_enable, %d parity_type, "
1152 "%d data_bits (+5)", __FUNCTION__, stop_bits,
1153 parity_enable, parity_type, data_bits);
1154
1155 cypress_serial_control(port, baud_mask, data_bits, stop_bits,
1156 parity_enable, parity_type, 0, CYPRESS_SET_CONFIG);
1157
1158 /* we perform a CYPRESS_GET_CONFIG so that the current settings are
1159 * filled into the private structure this should confirm that all is
1160 * working if it returns what we just set */
1161 cypress_serial_control(port, 0, 0, 0, 0, 0, 0, CYPRESS_GET_CONFIG);
1162
1163 /* Here we can define custom tty settings for devices; the main tty
1164 * termios flag base comes from empeg.c */
1165
1166 spin_lock_irqsave(&priv->lock, flags);
1167 if ( (priv->chiptype == CT_EARTHMATE) && (priv->baud_rate == 4800) ) {
1168 dbg("Using custom termios settings for a baud rate of "
1169 "4800bps.");
1170 /* define custom termios settings for NMEA protocol */
1171
1172 tty->termios->c_iflag /* input modes - */
1173 &= ~(IGNBRK /* disable ignore break */
1174 | BRKINT /* disable break causes interrupt */
1175 | PARMRK /* disable mark parity errors */
1176 | ISTRIP /* disable clear high bit of input char */
1177 | INLCR /* disable translate NL to CR */
1178 | IGNCR /* disable ignore CR */
1179 | ICRNL /* disable translate CR to NL */
1180 | IXON); /* disable enable XON/XOFF flow control */
1181
1182 tty->termios->c_oflag /* output modes */
1183 &= ~OPOST; /* disable postprocess output char */
1184
1185 tty->termios->c_lflag /* line discipline modes */
1186 &= ~(ECHO /* disable echo input characters */
1187 | ECHONL /* disable echo new line */
1188 | ICANON /* disable erase, kill, werase, and rprnt
1189 special characters */
1190 | ISIG /* disable interrupt, quit, and suspend
1191 special characters */
1192 | IEXTEN); /* disable non-POSIX special characters */
1193 } /* CT_CYPHIDCOM: Application should handle this for device */
1194
1195 linechange = (priv->line_control != oldlines);
1196 spin_unlock_irqrestore(&priv->lock, flags);
1197
1198 /* if necessary, set lines */
1199 if (linechange) {
1200 priv->cmd_ctrl = 1;
1201 cypress_write(port, NULL, 0);
1202 }
1203 } /* cypress_set_termios */
1204
1205
1206 /* returns amount of data still left in soft buffer */
1207 static int cypress_chars_in_buffer(struct usb_serial_port *port)
1208 {
1209 struct cypress_private *priv = usb_get_serial_port_data(port);
1210 int chars = 0;
1211 unsigned long flags;
1212
1213 dbg("%s - port %d", __FUNCTION__, port->number);
1214
1215 spin_lock_irqsave(&priv->lock, flags);
1216 chars = cypress_buf_data_avail(priv->buf);
1217 spin_unlock_irqrestore(&priv->lock, flags);
1218
1219 dbg("%s - returns %d", __FUNCTION__, chars);
1220 return chars;
1221 }
1222
1223
1224 static void cypress_throttle (struct usb_serial_port *port)
1225 {
1226 struct cypress_private *priv = usb_get_serial_port_data(port);
1227 unsigned long flags;
1228
1229 dbg("%s - port %d", __FUNCTION__, port->number);
1230
1231 spin_lock_irqsave(&priv->lock, flags);
1232 priv->rx_flags = THROTTLED;
1233 spin_unlock_irqrestore(&priv->lock, flags);
1234 }
1235
1236
1237 static void cypress_unthrottle (struct usb_serial_port *port)
1238 {
1239 struct cypress_private *priv = usb_get_serial_port_data(port);
1240 int actually_throttled, result;
1241 unsigned long flags;
1242
1243 dbg("%s - port %d", __FUNCTION__, port->number);
1244
1245 spin_lock_irqsave(&priv->lock, flags);
1246 actually_throttled = priv->rx_flags & ACTUALLY_THROTTLED;
1247 priv->rx_flags = 0;
1248 spin_unlock_irqrestore(&priv->lock, flags);
1249
1250 if (!priv->comm_is_ok)
1251 return;
1252
1253 if (actually_throttled) {
1254 port->interrupt_in_urb->dev = port->serial->dev;
1255
1256 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
1257 if (result) {
1258 dev_err(&port->dev, "%s - failed submitting read urb, "
1259 "error %d\n", __FUNCTION__, result);
1260 cypress_set_dead(port);
1261 }
1262 }
1263 }
1264
1265
1266 static void cypress_read_int_callback(struct urb *urb)
1267 {
1268 struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
1269 struct cypress_private *priv = usb_get_serial_port_data(port);
1270 struct tty_struct *tty;
1271 unsigned char *data = urb->transfer_buffer;
1272 unsigned long flags;
1273 char tty_flag = TTY_NORMAL;
1274 int havedata = 0;
1275 int bytes = 0;
1276 int result;
1277 int i = 0;
1278
1279 dbg("%s - port %d", __FUNCTION__, port->number);
1280
1281 switch (urb->status) {
1282 case 0: /* success */
1283 break;
1284 case -ECONNRESET:
1285 case -ENOENT:
1286 case -ESHUTDOWN:
1287 /* precursor to disconnect so just go away */
1288 return;
1289 case -EPIPE:
1290 usb_clear_halt(port->serial->dev,0x81);
1291 break;
1292 default:
1293 /* something ugly is going on... */
1294 dev_err(&urb->dev->dev,"%s - unexpected nonzero read status received: %d\n",
1295 __FUNCTION__,urb->status);
1296 cypress_set_dead(port);
1297 return;
1298 }
1299
1300 spin_lock_irqsave(&priv->lock, flags);
1301 if (priv->rx_flags & THROTTLED) {
1302 dbg("%s - now throttling", __FUNCTION__);
1303 priv->rx_flags |= ACTUALLY_THROTTLED;
1304 spin_unlock_irqrestore(&priv->lock, flags);
1305 return;
1306 }
1307 spin_unlock_irqrestore(&priv->lock, flags);
1308
1309 tty = port->tty;
1310 if (!tty) {
1311 dbg("%s - bad tty pointer - exiting", __FUNCTION__);
1312 return;
1313 }
1314
1315 spin_lock_irqsave(&priv->lock, flags);
1316 switch(urb->actual_length) {
1317 case 32:
1318 /* This is for the CY7C64013... */
1319 priv->current_status = data[0] & 0xF8;
1320 bytes = data[1] + 2;
1321 i = 2;
1322 if (bytes > 2)
1323 havedata = 1;
1324 break;
1325 case 8:
1326 /* This is for the CY7C63743... */
1327 priv->current_status = data[0] & 0xF8;
1328 bytes = (data[0] & 0x07) + 1;
1329 i = 1;
1330 if (bytes > 1)
1331 havedata = 1;
1332 break;
1333 default:
1334 dbg("%s - wrong packet size - received %d bytes",
1335 __FUNCTION__, urb->actual_length);
1336 spin_unlock_irqrestore(&priv->lock, flags);
1337 goto continue_read;
1338 }
1339 spin_unlock_irqrestore(&priv->lock, flags);
1340
1341 usb_serial_debug_data (debug, &port->dev, __FUNCTION__,
1342 urb->actual_length, data);
1343
1344 spin_lock_irqsave(&priv->lock, flags);
1345 /* check to see if status has changed */
1346 if (priv != NULL) {
1347 if (priv->current_status != priv->prev_status) {
1348 priv->diff_status |= priv->current_status ^
1349 priv->prev_status;
1350 wake_up_interruptible(&priv->delta_msr_wait);
1351 priv->prev_status = priv->current_status;
1352 }
1353 }
1354 spin_unlock_irqrestore(&priv->lock, flags);
1355
1356 /* hangup, as defined in acm.c... this might be a bad place for it
1357 * though */
1358 if (tty && !(tty->termios->c_cflag & CLOCAL) &&
1359 !(priv->current_status & UART_CD)) {
1360 dbg("%s - calling hangup", __FUNCTION__);
1361 tty_hangup(tty);
1362 goto continue_read;
1363 }
1364
1365 /* There is one error bit... I'm assuming it is a parity error
1366 * indicator as the generic firmware will set this bit to 1 if a
1367 * parity error occurs.
1368 * I can not find reference to any other error events. */
1369 spin_lock_irqsave(&priv->lock, flags);
1370 if (priv->current_status & CYP_ERROR) {
1371 spin_unlock_irqrestore(&priv->lock, flags);
1372 tty_flag = TTY_PARITY;
1373 dbg("%s - Parity Error detected", __FUNCTION__);
1374 } else
1375 spin_unlock_irqrestore(&priv->lock, flags);
1376
1377 /* process read if there is data other than line status */
1378 if (tty && (bytes > i)) {
1379 bytes = tty_buffer_request_room(tty, bytes);
1380 for (; i < bytes ; ++i) {
1381 dbg("pushing byte number %d - %d - %c", i, data[i],
1382 data[i]);
1383 tty_insert_flip_char(tty, data[i], tty_flag);
1384 }
1385 tty_flip_buffer_push(port->tty);
1386 }
1387
1388 spin_lock_irqsave(&priv->lock, flags);
1389 /* control and status byte(s) are also counted */
1390 priv->bytes_in += bytes;
1391 spin_unlock_irqrestore(&priv->lock, flags);
1392
1393 continue_read:
1394
1395 /* Continue trying to always read... unless the port has closed. */
1396
1397 if (port->open_count > 0 && priv->comm_is_ok) {
1398 usb_fill_int_urb(port->interrupt_in_urb, port->serial->dev,
1399 usb_rcvintpipe(port->serial->dev,
1400 port->interrupt_in_endpointAddress),
1401 port->interrupt_in_urb->transfer_buffer,
1402 port->interrupt_in_urb->transfer_buffer_length,
1403 cypress_read_int_callback, port, priv->read_urb_interval);
1404 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
1405 if (result) {
1406 dev_err(&urb->dev->dev, "%s - failed resubmitting "
1407 "read urb, error %d\n", __FUNCTION__,
1408 result);
1409 cypress_set_dead(port);
1410 }
1411 }
1412
1413 return;
1414 } /* cypress_read_int_callback */
1415
1416
1417 static void cypress_write_int_callback(struct urb *urb)
1418 {
1419 struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
1420 struct cypress_private *priv = usb_get_serial_port_data(port);
1421 int result;
1422
1423 dbg("%s - port %d", __FUNCTION__, port->number);
1424
1425 switch (urb->status) {
1426 case 0:
1427 /* success */
1428 break;
1429 case -ECONNRESET:
1430 case -ENOENT:
1431 case -ESHUTDOWN:
1432 /* this urb is terminated, clean up */
1433 dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
1434 priv->write_urb_in_use = 0;
1435 return;
1436 case -EPIPE: /* no break needed; clear halt and resubmit */
1437 if (!priv->comm_is_ok)
1438 break;
1439 usb_clear_halt(port->serial->dev, 0x02);
1440 /* error in the urb, so we have to resubmit it */
1441 dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->status);
1442 port->interrupt_out_urb->transfer_buffer_length = 1;
1443 port->interrupt_out_urb->dev = port->serial->dev;
1444 result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC);
1445 if (!result)
1446 return;
1447 dev_err(&urb->dev->dev, "%s - failed resubmitting write urb, error %d\n",
1448 __FUNCTION__, result);
1449 cypress_set_dead(port);
1450 break;
1451 default:
1452 dev_err(&urb->dev->dev,"%s - unexpected nonzero write status received: %d\n",
1453 __FUNCTION__,urb->status);
1454 cypress_set_dead(port);
1455 break;
1456 }
1457
1458 priv->write_urb_in_use = 0;
1459
1460 /* send any buffered data */
1461 cypress_send(port);
1462 }
1463
1464
1465 /*****************************************************************************
1466 * Write buffer functions - buffering code from pl2303 used
1467 *****************************************************************************/
1468
1469 /*
1470 * cypress_buf_alloc
1471 *
1472 * Allocate a circular buffer and all associated memory.
1473 */
1474
1475 static struct cypress_buf *cypress_buf_alloc(unsigned int size)
1476 {
1477
1478 struct cypress_buf *cb;
1479
1480
1481 if (size == 0)
1482 return NULL;
1483
1484 cb = kmalloc(sizeof(struct cypress_buf), GFP_KERNEL);
1485 if (cb == NULL)
1486 return NULL;
1487
1488 cb->buf_buf = kmalloc(size, GFP_KERNEL);
1489 if (cb->buf_buf == NULL) {
1490 kfree(cb);
1491 return NULL;
1492 }
1493
1494 cb->buf_size = size;
1495 cb->buf_get = cb->buf_put = cb->buf_buf;
1496
1497 return cb;
1498
1499 }
1500
1501
1502 /*
1503 * cypress_buf_free
1504 *
1505 * Free the buffer and all associated memory.
1506 */
1507
1508 static void cypress_buf_free(struct cypress_buf *cb)
1509 {
1510 if (cb) {
1511 kfree(cb->buf_buf);
1512 kfree(cb);
1513 }
1514 }
1515
1516
1517 /*
1518 * cypress_buf_clear
1519 *
1520 * Clear out all data in the circular buffer.
1521 */
1522
1523 static void cypress_buf_clear(struct cypress_buf *cb)
1524 {
1525 if (cb != NULL)
1526 cb->buf_get = cb->buf_put;
1527 /* equivalent to a get of all data available */
1528 }
1529
1530
1531 /*
1532 * cypress_buf_data_avail
1533 *
1534 * Return the number of bytes of data available in the circular
1535 * buffer.
1536 */
1537
1538 static unsigned int cypress_buf_data_avail(struct cypress_buf *cb)
1539 {
1540 if (cb != NULL)
1541 return ((cb->buf_size + cb->buf_put - cb->buf_get) % cb->buf_size);
1542 else
1543 return 0;
1544 }
1545
1546
1547 /*
1548 * cypress_buf_space_avail
1549 *
1550 * Return the number of bytes of space available in the circular
1551 * buffer.
1552 */
1553
1554 static unsigned int cypress_buf_space_avail(struct cypress_buf *cb)
1555 {
1556 if (cb != NULL)
1557 return ((cb->buf_size + cb->buf_get - cb->buf_put - 1) % cb->buf_size);
1558 else
1559 return 0;
1560 }
1561
1562
1563 /*
1564 * cypress_buf_put
1565 *
1566 * Copy data data from a user buffer and put it into the circular buffer.
1567 * Restrict to the amount of space available.
1568 *
1569 * Return the number of bytes copied.
1570 */
1571
1572 static unsigned int cypress_buf_put(struct cypress_buf *cb, const char *buf,
1573 unsigned int count)
1574 {
1575
1576 unsigned int len;
1577
1578
1579 if (cb == NULL)
1580 return 0;
1581
1582 len = cypress_buf_space_avail(cb);
1583 if (count > len)
1584 count = len;
1585
1586 if (count == 0)
1587 return 0;
1588
1589 len = cb->buf_buf + cb->buf_size - cb->buf_put;
1590 if (count > len) {
1591 memcpy(cb->buf_put, buf, len);
1592 memcpy(cb->buf_buf, buf+len, count - len);
1593 cb->buf_put = cb->buf_buf + count - len;
1594 } else {
1595 memcpy(cb->buf_put, buf, count);
1596 if (count < len)
1597 cb->buf_put += count;
1598 else /* count == len */
1599 cb->buf_put = cb->buf_buf;
1600 }
1601
1602 return count;
1603
1604 }
1605
1606
1607 /*
1608 * cypress_buf_get
1609 *
1610 * Get data from the circular buffer and copy to the given buffer.
1611 * Restrict to the amount of data available.
1612 *
1613 * Return the number of bytes copied.
1614 */
1615
1616 static unsigned int cypress_buf_get(struct cypress_buf *cb, char *buf,
1617 unsigned int count)
1618 {
1619
1620 unsigned int len;
1621
1622
1623 if (cb == NULL)
1624 return 0;
1625
1626 len = cypress_buf_data_avail(cb);
1627 if (count > len)
1628 count = len;
1629
1630 if (count == 0)
1631 return 0;
1632
1633 len = cb->buf_buf + cb->buf_size - cb->buf_get;
1634 if (count > len) {
1635 memcpy(buf, cb->buf_get, len);
1636 memcpy(buf+len, cb->buf_buf, count - len);
1637 cb->buf_get = cb->buf_buf + count - len;
1638 } else {
1639 memcpy(buf, cb->buf_get, count);
1640 if (count < len)
1641 cb->buf_get += count;
1642 else /* count == len */
1643 cb->buf_get = cb->buf_buf;
1644 }
1645
1646 return count;
1647
1648 }
1649
1650 /*****************************************************************************
1651 * Module functions
1652 *****************************************************************************/
1653
1654 static int __init cypress_init(void)
1655 {
1656 int retval;
1657
1658 dbg("%s", __FUNCTION__);
1659
1660 retval = usb_serial_register(&cypress_earthmate_device);
1661 if (retval)
1662 goto failed_em_register;
1663 retval = usb_serial_register(&cypress_hidcom_device);
1664 if (retval)
1665 goto failed_hidcom_register;
1666 retval = usb_serial_register(&cypress_ca42v2_device);
1667 if (retval)
1668 goto failed_ca42v2_register;
1669 retval = usb_register(&cypress_driver);
1670 if (retval)
1671 goto failed_usb_register;
1672
1673 info(DRIVER_DESC " " DRIVER_VERSION);
1674 return 0;
1675
1676 failed_usb_register:
1677 usb_serial_deregister(&cypress_ca42v2_device);
1678 failed_ca42v2_register:
1679 usb_serial_deregister(&cypress_hidcom_device);
1680 failed_hidcom_register:
1681 usb_serial_deregister(&cypress_earthmate_device);
1682 failed_em_register:
1683 return retval;
1684 }
1685
1686
1687 static void __exit cypress_exit (void)
1688 {
1689 dbg("%s", __FUNCTION__);
1690
1691 usb_deregister (&cypress_driver);
1692 usb_serial_deregister (&cypress_earthmate_device);
1693 usb_serial_deregister (&cypress_hidcom_device);
1694 usb_serial_deregister (&cypress_ca42v2_device);
1695 }
1696
1697
1698 module_init(cypress_init);
1699 module_exit(cypress_exit);
1700
1701 MODULE_AUTHOR( DRIVER_AUTHOR );
1702 MODULE_DESCRIPTION( DRIVER_DESC );
1703 MODULE_VERSION( DRIVER_VERSION );
1704 MODULE_LICENSE("GPL");
1705
1706 module_param(debug, bool, S_IRUGO | S_IWUSR);
1707 MODULE_PARM_DESC(debug, "Debug enabled or not");
1708 module_param(stats, bool, S_IRUGO | S_IWUSR);
1709 MODULE_PARM_DESC(stats, "Enable statistics or not");
1710 module_param(interval, int, S_IRUGO | S_IWUSR);
1711 MODULE_PARM_DESC(interval, "Overrides interrupt interval");
Support for the Chinese Samsung S3C2440 based development boards