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1/*
2 * USB Cypress M8 driver
3 *
4 * Copyright (C) 2004
5 * Lonnie Mendez (dignome@gmail.com)
6 * Copyright (C) 2003,2004
7 * Neil Whelchel (koyama@firstlight.net)
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * See Documentation/usb/usb-serial.txt for more information on using this
15 * driver
16 *
17 * See http://geocities.com/i0xox0i for information on this driver and the
18 * earthmate usb device.
19 *
20 * Lonnie Mendez <dignome@gmail.com>
21 * 4-29-2005
22 * Fixed problem where setting or retreiving the serial config would fail
23 * with EPIPE. Removed CRTS toggling so the driver behaves more like
24 * other usbserial adapters. Issued new interval of 1ms instead of the
25 * default 10ms. As a result, transfer speed has been substantially
26 * increased from avg. 850bps to avg. 3300bps. initial termios has also
27 * been modified. Cleaned up code and formatting issues so it is more
28 * readable. Replaced the C++ style comments.
29 *
30 * Lonnie Mendez <dignome@gmail.com>
31 * 12-15-2004
32 * Incorporated write buffering from pl2303 driver. Fixed bug with line
33 * handling so both lines are raised in cypress_open. (was dropping rts)
34 * Various code cleanups made as well along with other misc bug fixes.
35 *
36 * Lonnie Mendez <dignome@gmail.com>
37 * 04-10-2004
38 * Driver modified to support dynamic line settings. Various improvements
39 * and features.
40 *
41 * Neil Whelchel
42 * 10-2003
43 * Driver first released.
44 *
45 */
46
47/* Thanks to Neil Whelchel for writing the first cypress m8 implementation
48 for linux. */
49/* Thanks to cypress for providing references for the hid reports. */
50/* Thanks to Jiang Zhang for providing links and for general help. */
51/* Code originates and was built up from ftdi_sio, belkin, pl2303 and others.*/
52
53
54#include <linux/kernel.h>
55#include <linux/errno.h>
56#include <linux/init.h>
57#include <linux/slab.h>
58#include <linux/tty.h>
59#include <linux/tty_driver.h>
60#include <linux/tty_flip.h>
61#include <linux/module.h>
62#include <linux/moduleparam.h>
63#include <linux/spinlock.h>
64#include <linux/usb.h>
65#include <linux/usb/serial.h>
66#include <linux/serial.h>
67#include <linux/kfifo.h>
68#include <linux/delay.h>
69#include <linux/uaccess.h>
70#include <asm/unaligned.h>
71
72#include "cypress_m8.h"
73
74
75static int debug;
76static int stats;
77static int interval;
78static int unstable_bauds;
79
80/*
81 * Version Information
82 */
83#define DRIVER_VERSION "v1.10"
84#define DRIVER_AUTHOR "Lonnie Mendez <dignome@gmail.com>, Neil Whelchel <koyama@firstlight.net>"
85#define DRIVER_DESC "Cypress USB to Serial Driver"
86
87/* write buffer size defines */
88#define CYPRESS_BUF_SIZE 1024
89
90static const struct usb_device_id id_table_earthmate[] = {
91 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
92 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
93 { } /* Terminating entry */
94};
95
96static const struct usb_device_id id_table_cyphidcomrs232[] = {
97 { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
98 { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) },
99 { } /* Terminating entry */
100};
101
102static const struct usb_device_id id_table_nokiaca42v2[] = {
103 { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
104 { } /* Terminating entry */
105};
106
107static const struct usb_device_id id_table_combined[] = {
108 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
109 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
110 { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
111 { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) },
112 { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
113 { } /* Terminating entry */
114};
115
116MODULE_DEVICE_TABLE(usb, id_table_combined);
117
118static struct usb_driver cypress_driver = {
119 .name = "cypress",
120 .probe = usb_serial_probe,
121 .disconnect = usb_serial_disconnect,
122 .id_table = id_table_combined,
123 .no_dynamic_id = 1,
124};
125
126enum packet_format {
127 packet_format_1, /* b0:status, b1:payload count */
128 packet_format_2 /* b0[7:3]:status, b0[2:0]:payload count */
129};
130
131struct cypress_private {
132 spinlock_t lock; /* private lock */
133 int chiptype; /* identifier of device, for quirks/etc */
134 int bytes_in; /* used for statistics */
135 int bytes_out; /* used for statistics */
136 int cmd_count; /* used for statistics */
137 int cmd_ctrl; /* always set this to 1 before issuing a command */
138 struct kfifo write_fifo; /* write fifo */
139 int write_urb_in_use; /* write urb in use indicator */
140 int write_urb_interval; /* interval to use for write urb */
141 int read_urb_interval; /* interval to use for read urb */
142 int comm_is_ok; /* true if communication is (still) ok */
143 int termios_initialized;
144 __u8 line_control; /* holds dtr / rts value */
145 __u8 current_status; /* received from last read - info on dsr,cts,cd,ri,etc */
146 __u8 current_config; /* stores the current configuration byte */
147 __u8 rx_flags; /* throttling - used from whiteheat/ftdi_sio */
148 enum packet_format pkt_fmt; /* format to use for packet send / receive */
149 int get_cfg_unsafe; /* If true, the CYPRESS_GET_CONFIG is unsafe */
150 int baud_rate; /* stores current baud rate in
151 integer form */
152 int isthrottled; /* if throttled, discard reads */
153 wait_queue_head_t delta_msr_wait; /* used for TIOCMIWAIT */
154 char prev_status, diff_status; /* used for TIOCMIWAIT */
155 /* we pass a pointer to this as the argument sent to
156 cypress_set_termios old_termios */
157 struct ktermios tmp_termios; /* stores the old termios settings */
158};
159
160/* function prototypes for the Cypress USB to serial device */
161static int cypress_earthmate_startup(struct usb_serial *serial);
162static int cypress_hidcom_startup(struct usb_serial *serial);
163static int cypress_ca42v2_startup(struct usb_serial *serial);
164static void cypress_release(struct usb_serial *serial);
165static int cypress_open(struct tty_struct *tty, struct usb_serial_port *port);
166static void cypress_close(struct usb_serial_port *port);
167static void cypress_dtr_rts(struct usb_serial_port *port, int on);
168static int cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
169 const unsigned char *buf, int count);
170static void cypress_send(struct usb_serial_port *port);
171static int cypress_write_room(struct tty_struct *tty);
172static int cypress_ioctl(struct tty_struct *tty,
173 unsigned int cmd, unsigned long arg);
174static void cypress_set_termios(struct tty_struct *tty,
175 struct usb_serial_port *port, struct ktermios *old);
176static int cypress_tiocmget(struct tty_struct *tty);
177static int cypress_tiocmset(struct tty_struct *tty,
178 unsigned int set, unsigned int clear);
179static int cypress_chars_in_buffer(struct tty_struct *tty);
180static void cypress_throttle(struct tty_struct *tty);
181static void cypress_unthrottle(struct tty_struct *tty);
182static void cypress_set_dead(struct usb_serial_port *port);
183static void cypress_read_int_callback(struct urb *urb);
184static void cypress_write_int_callback(struct urb *urb);
185
186static struct usb_serial_driver cypress_earthmate_device = {
187 .driver = {
188 .owner = THIS_MODULE,
189 .name = "earthmate",
190 },
191 .description = "DeLorme Earthmate USB",
192 .usb_driver = &cypress_driver,
193 .id_table = id_table_earthmate,
194 .num_ports = 1,
195 .attach = cypress_earthmate_startup,
196 .release = cypress_release,
197 .open = cypress_open,
198 .close = cypress_close,
199 .dtr_rts = cypress_dtr_rts,
200 .write = cypress_write,
201 .write_room = cypress_write_room,
202 .ioctl = cypress_ioctl,
203 .set_termios = cypress_set_termios,
204 .tiocmget = cypress_tiocmget,
205 .tiocmset = cypress_tiocmset,
206 .chars_in_buffer = cypress_chars_in_buffer,
207 .throttle = cypress_throttle,
208 .unthrottle = cypress_unthrottle,
209 .read_int_callback = cypress_read_int_callback,
210 .write_int_callback = cypress_write_int_callback,
211};
212
213static struct usb_serial_driver cypress_hidcom_device = {
214 .driver = {
215 .owner = THIS_MODULE,
216 .name = "cyphidcom",
217 },
218 .description = "HID->COM RS232 Adapter",
219 .usb_driver = &cypress_driver,
220 .id_table = id_table_cyphidcomrs232,
221 .num_ports = 1,
222 .attach = cypress_hidcom_startup,
223 .release = cypress_release,
224 .open = cypress_open,
225 .close = cypress_close,
226 .dtr_rts = cypress_dtr_rts,
227 .write = cypress_write,
228 .write_room = cypress_write_room,
229 .ioctl = cypress_ioctl,
230 .set_termios = cypress_set_termios,
231 .tiocmget = cypress_tiocmget,
232 .tiocmset = cypress_tiocmset,
233 .chars_in_buffer = cypress_chars_in_buffer,
234 .throttle = cypress_throttle,
235 .unthrottle = cypress_unthrottle,
236 .read_int_callback = cypress_read_int_callback,
237 .write_int_callback = cypress_write_int_callback,
238};
239
240static struct usb_serial_driver cypress_ca42v2_device = {
241 .driver = {
242 .owner = THIS_MODULE,
243 .name = "nokiaca42v2",
244 },
245 .description = "Nokia CA-42 V2 Adapter",
246 .usb_driver = &cypress_driver,
247 .id_table = id_table_nokiaca42v2,
248 .num_ports = 1,
249 .attach = cypress_ca42v2_startup,
250 .release = cypress_release,
251 .open = cypress_open,
252 .close = cypress_close,
253 .dtr_rts = cypress_dtr_rts,
254 .write = cypress_write,
255 .write_room = cypress_write_room,
256 .ioctl = cypress_ioctl,
257 .set_termios = cypress_set_termios,
258 .tiocmget = cypress_tiocmget,
259 .tiocmset = cypress_tiocmset,
260 .chars_in_buffer = cypress_chars_in_buffer,
261 .throttle = cypress_throttle,
262 .unthrottle = cypress_unthrottle,
263 .read_int_callback = cypress_read_int_callback,
264 .write_int_callback = cypress_write_int_callback,
265};
266
267/*****************************************************************************
268 * Cypress serial helper functions
269 *****************************************************************************/
270
271
272static int analyze_baud_rate(struct usb_serial_port *port, speed_t new_rate)
273{
274 struct cypress_private *priv;
275 priv = usb_get_serial_port_data(port);
276
277 if (unstable_bauds)
278 return new_rate;
279
280 /*
281 * The general purpose firmware for the Cypress M8 allows for
282 * a maximum speed of 57600bps (I have no idea whether DeLorme
283 * chose to use the general purpose firmware or not), if you
284 * need to modify this speed setting for your own project
285 * please add your own chiptype and modify the code likewise.
286 * The Cypress HID->COM device will work successfully up to
287 * 115200bps (but the actual throughput is around 3kBps).
288 */
289 if (port->serial->dev->speed == USB_SPEED_LOW) {
290 /*
291 * Mike Isely <isely@pobox.com> 2-Feb-2008: The
292 * Cypress app note that describes this mechanism
293 * states the the low-speed part can't handle more
294 * than 800 bytes/sec, in which case 4800 baud is the
295 * safest speed for a part like that.
296 */
297 if (new_rate > 4800) {
298 dbg("%s - failed setting baud rate, device incapable "
299 "speed %d", __func__, new_rate);
300 return -1;
301 }
302 }
303 switch (priv->chiptype) {
304 case CT_EARTHMATE:
305 if (new_rate <= 600) {
306 /* 300 and 600 baud rates are supported under
307 * the generic firmware, but are not used with
308 * NMEA and SiRF protocols */
309 dbg("%s - failed setting baud rate, unsupported speed "
310 "of %d on Earthmate GPS", __func__, new_rate);
311 return -1;
312 }
313 break;
314 default:
315 break;
316 }
317 return new_rate;
318}
319
320
321/* This function can either set or retrieve the current serial line settings */
322static int cypress_serial_control(struct tty_struct *tty,
323 struct usb_serial_port *port, speed_t baud_rate, int data_bits,
324 int stop_bits, int parity_enable, int parity_type, int reset,
325 int cypress_request_type)
326{
327 int new_baudrate = 0, retval = 0, tries = 0;
328 struct cypress_private *priv;
329 u8 *feature_buffer;
330 const unsigned int feature_len = 5;
331 unsigned long flags;
332
333 dbg("%s", __func__);
334
335 priv = usb_get_serial_port_data(port);
336
337 if (!priv->comm_is_ok)
338 return -ENODEV;
339
340 feature_buffer = kcalloc(feature_len, sizeof(u8), GFP_KERNEL);
341 if (!feature_buffer)
342 return -ENOMEM;
343
344 switch (cypress_request_type) {
345 case CYPRESS_SET_CONFIG:
346 /* 0 means 'Hang up' so doesn't change the true bit rate */
347 new_baudrate = priv->baud_rate;
348 if (baud_rate && baud_rate != priv->baud_rate) {
349 dbg("%s - baud rate is changing", __func__);
350 retval = analyze_baud_rate(port, baud_rate);
351 if (retval >= 0) {
352 new_baudrate = retval;
353 dbg("%s - New baud rate set to %d",
354 __func__, new_baudrate);
355 }
356 }
357 dbg("%s - baud rate is being sent as %d",
358 __func__, new_baudrate);
359
360 /* fill the feature_buffer with new configuration */
361 put_unaligned_le32(new_baudrate, feature_buffer);
362 feature_buffer[4] |= data_bits; /* assign data bits in 2 bit space ( max 3 ) */
363 /* 1 bit gap */
364 feature_buffer[4] |= (stop_bits << 3); /* assign stop bits in 1 bit space */
365 feature_buffer[4] |= (parity_enable << 4); /* assign parity flag in 1 bit space */
366 feature_buffer[4] |= (parity_type << 5); /* assign parity type in 1 bit space */
367 /* 1 bit gap */
368 feature_buffer[4] |= (reset << 7); /* assign reset at end of byte, 1 bit space */
369
370 dbg("%s - device is being sent this feature report:",
371 __func__);
372 dbg("%s - %02X - %02X - %02X - %02X - %02X", __func__,
373 feature_buffer[0], feature_buffer[1],
374 feature_buffer[2], feature_buffer[3],
375 feature_buffer[4]);
376
377 do {
378 retval = usb_control_msg(port->serial->dev,
379 usb_sndctrlpipe(port->serial->dev, 0),
380 HID_REQ_SET_REPORT,
381 USB_DIR_OUT | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
382 0x0300, 0, feature_buffer,
383 feature_len, 500);
384
385 if (tries++ >= 3)
386 break;
387
388 } while (retval != feature_len &&
389 retval != -ENODEV);
390
391 if (retval != feature_len) {
392 dev_err(&port->dev, "%s - failed sending serial "
393 "line settings - %d\n", __func__, retval);
394 cypress_set_dead(port);
395 } else {
396 spin_lock_irqsave(&priv->lock, flags);
397 priv->baud_rate = new_baudrate;
398 priv->current_config = feature_buffer[4];
399 spin_unlock_irqrestore(&priv->lock, flags);
400 /* If we asked for a speed change encode it */
401 if (baud_rate)
402 tty_encode_baud_rate(tty,
403 new_baudrate, new_baudrate);
404 }
405 break;
406 case CYPRESS_GET_CONFIG:
407 if (priv->get_cfg_unsafe) {
408 /* Not implemented for this device,
409 and if we try to do it we're likely
410 to crash the hardware. */
411 retval = -ENOTTY;
412 goto out;
413 }
414 dbg("%s - retreiving serial line settings", __func__);
415 do {
416 retval = usb_control_msg(port->serial->dev,
417 usb_rcvctrlpipe(port->serial->dev, 0),
418 HID_REQ_GET_REPORT,
419 USB_DIR_IN | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
420 0x0300, 0, feature_buffer,
421 feature_len, 500);
422
423 if (tries++ >= 3)
424 break;
425 } while (retval != feature_len
426 && retval != -ENODEV);
427
428 if (retval != feature_len) {
429 dev_err(&port->dev, "%s - failed to retrieve serial "
430 "line settings - %d\n", __func__, retval);
431 cypress_set_dead(port);
432 goto out;
433 } else {
434 spin_lock_irqsave(&priv->lock, flags);
435 /* store the config in one byte, and later
436 use bit masks to check values */
437 priv->current_config = feature_buffer[4];
438 priv->baud_rate = get_unaligned_le32(feature_buffer);
439 spin_unlock_irqrestore(&priv->lock, flags);
440 }
441 }
442 spin_lock_irqsave(&priv->lock, flags);
443 ++priv->cmd_count;
444 spin_unlock_irqrestore(&priv->lock, flags);
445out:
446 kfree(feature_buffer);
447 return retval;
448} /* cypress_serial_control */
449
450
451static void cypress_set_dead(struct usb_serial_port *port)
452{
453 struct cypress_private *priv = usb_get_serial_port_data(port);
454 unsigned long flags;
455
456 spin_lock_irqsave(&priv->lock, flags);
457 if (!priv->comm_is_ok) {
458 spin_unlock_irqrestore(&priv->lock, flags);
459 return;
460 }
461 priv->comm_is_ok = 0;
462 spin_unlock_irqrestore(&priv->lock, flags);
463
464 dev_err(&port->dev, "cypress_m8 suspending failing port %d - "
465 "interval might be too short\n", port->number);
466}
467
468
469/*****************************************************************************
470 * Cypress serial driver functions
471 *****************************************************************************/
472
473
474static int generic_startup(struct usb_serial *serial)
475{
476 struct cypress_private *priv;
477 struct usb_serial_port *port = serial->port[0];
478
479 dbg("%s - port %d", __func__, port->number);
480
481 priv = kzalloc(sizeof(struct cypress_private), GFP_KERNEL);
482 if (!priv)
483 return -ENOMEM;
484
485 priv->comm_is_ok = !0;
486 spin_lock_init(&priv->lock);
487 if (kfifo_alloc(&priv->write_fifo, CYPRESS_BUF_SIZE, GFP_KERNEL)) {
488 kfree(priv);
489 return -ENOMEM;
490 }
491 init_waitqueue_head(&priv->delta_msr_wait);
492
493 usb_reset_configuration(serial->dev);
494
495 priv->cmd_ctrl = 0;
496 priv->line_control = 0;
497 priv->termios_initialized = 0;
498 priv->rx_flags = 0;
499 /* Default packet format setting is determined by packet size.
500 Anything with a size larger then 9 must have a separate
501 count field since the 3 bit count field is otherwise too
502 small. Otherwise we can use the slightly more compact
503 format. This is in accordance with the cypress_m8 serial
504 converter app note. */
505 if (port->interrupt_out_size > 9)
506 priv->pkt_fmt = packet_format_1;
507 else
508 priv->pkt_fmt = packet_format_2;
509
510 if (interval > 0) {
511 priv->write_urb_interval = interval;
512 priv->read_urb_interval = interval;
513 dbg("%s - port %d read & write intervals forced to %d",
514 __func__, port->number, interval);
515 } else {
516 priv->write_urb_interval = port->interrupt_out_urb->interval;
517 priv->read_urb_interval = port->interrupt_in_urb->interval;
518 dbg("%s - port %d intervals: read=%d write=%d",
519 __func__, port->number,
520 priv->read_urb_interval, priv->write_urb_interval);
521 }
522 usb_set_serial_port_data(port, priv);
523
524 return 0;
525}
526
527
528static int cypress_earthmate_startup(struct usb_serial *serial)
529{
530 struct cypress_private *priv;
531 struct usb_serial_port *port = serial->port[0];
532
533 dbg("%s", __func__);
534
535 if (generic_startup(serial)) {
536 dbg("%s - Failed setting up port %d", __func__,
537 port->number);
538 return 1;
539 }
540
541 priv = usb_get_serial_port_data(port);
542 priv->chiptype = CT_EARTHMATE;
543 /* All Earthmate devices use the separated-count packet
544 format! Idiotic. */
545 priv->pkt_fmt = packet_format_1;
546 if (serial->dev->descriptor.idProduct !=
547 cpu_to_le16(PRODUCT_ID_EARTHMATEUSB)) {
548 /* The old original USB Earthmate seemed able to
549 handle GET_CONFIG requests; everything they've
550 produced since that time crashes if this command is
551 attempted :-( */
552 dbg("%s - Marking this device as unsafe for GET_CONFIG "
553 "commands", __func__);
554 priv->get_cfg_unsafe = !0;
555 }
556
557 return 0;
558} /* cypress_earthmate_startup */
559
560
561static int cypress_hidcom_startup(struct usb_serial *serial)
562{
563 struct cypress_private *priv;
564
565 dbg("%s", __func__);
566
567 if (generic_startup(serial)) {
568 dbg("%s - Failed setting up port %d", __func__,
569 serial->port[0]->number);
570 return 1;
571 }
572
573 priv = usb_get_serial_port_data(serial->port[0]);
574 priv->chiptype = CT_CYPHIDCOM;
575
576 return 0;
577} /* cypress_hidcom_startup */
578
579
580static int cypress_ca42v2_startup(struct usb_serial *serial)
581{
582 struct cypress_private *priv;
583
584 dbg("%s", __func__);
585
586 if (generic_startup(serial)) {
587 dbg("%s - Failed setting up port %d", __func__,
588 serial->port[0]->number);
589 return 1;
590 }
591
592 priv = usb_get_serial_port_data(serial->port[0]);
593 priv->chiptype = CT_CA42V2;
594
595 return 0;
596} /* cypress_ca42v2_startup */
597
598
599static void cypress_release(struct usb_serial *serial)
600{
601 struct cypress_private *priv;
602
603 dbg("%s - port %d", __func__, serial->port[0]->number);
604
605 /* all open ports are closed at this point */
606
607 priv = usb_get_serial_port_data(serial->port[0]);
608
609 if (priv) {
610 kfifo_free(&priv->write_fifo);
611 kfree(priv);
612 }
613}
614
615
616static int cypress_open(struct tty_struct *tty, struct usb_serial_port *port)
617{
618 struct cypress_private *priv = usb_get_serial_port_data(port);
619 struct usb_serial *serial = port->serial;
620 unsigned long flags;
621 int result = 0;
622
623 dbg("%s - port %d", __func__, port->number);
624
625 if (!priv->comm_is_ok)
626 return -EIO;
627
628 /* clear halts before open */
629 usb_clear_halt(serial->dev, 0x81);
630 usb_clear_halt(serial->dev, 0x02);
631
632 spin_lock_irqsave(&priv->lock, flags);
633 /* reset read/write statistics */
634 priv->bytes_in = 0;
635 priv->bytes_out = 0;
636 priv->cmd_count = 0;
637 priv->rx_flags = 0;
638 spin_unlock_irqrestore(&priv->lock, flags);
639
640 /* Set termios */
641 cypress_send(port);
642
643 if (tty)
644 cypress_set_termios(tty, port, &priv->tmp_termios);
645
646 /* setup the port and start reading from the device */
647 if (!port->interrupt_in_urb) {
648 dev_err(&port->dev, "%s - interrupt_in_urb is empty!\n",
649 __func__);
650 return -1;
651 }
652
653 usb_fill_int_urb(port->interrupt_in_urb, serial->dev,
654 usb_rcvintpipe(serial->dev, port->interrupt_in_endpointAddress),
655 port->interrupt_in_urb->transfer_buffer,
656 port->interrupt_in_urb->transfer_buffer_length,
657 cypress_read_int_callback, port, priv->read_urb_interval);
658 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
659
660 if (result) {
661 dev_err(&port->dev,
662 "%s - failed submitting read urb, error %d\n",
663 __func__, result);
664 cypress_set_dead(port);
665 }
666 port->port.drain_delay = 256;
667 return result;
668} /* cypress_open */
669
670static void cypress_dtr_rts(struct usb_serial_port *port, int on)
671{
672 struct cypress_private *priv = usb_get_serial_port_data(port);
673 /* drop dtr and rts */
674 spin_lock_irq(&priv->lock);
675 if (on == 0)
676 priv->line_control = 0;
677 else
678 priv->line_control = CONTROL_DTR | CONTROL_RTS;
679 priv->cmd_ctrl = 1;
680 spin_unlock_irq(&priv->lock);
681 cypress_write(NULL, port, NULL, 0);
682}
683
684static void cypress_close(struct usb_serial_port *port)
685{
686 struct cypress_private *priv = usb_get_serial_port_data(port);
687 unsigned long flags;
688
689 dbg("%s - port %d", __func__, port->number);
690
691 /* writing is potentially harmful, lock must be taken */
692 mutex_lock(&port->serial->disc_mutex);
693 if (port->serial->disconnected) {
694 mutex_unlock(&port->serial->disc_mutex);
695 return;
696 }
697 spin_lock_irqsave(&priv->lock, flags);
698 kfifo_reset_out(&priv->write_fifo);
699 spin_unlock_irqrestore(&priv->lock, flags);
700
701 dbg("%s - stopping urbs", __func__);
702 usb_kill_urb(port->interrupt_in_urb);
703 usb_kill_urb(port->interrupt_out_urb);
704
705 if (stats)
706 dev_info(&port->dev, "Statistics: %d Bytes In | %d Bytes Out | %d Commands Issued\n",
707 priv->bytes_in, priv->bytes_out, priv->cmd_count);
708 mutex_unlock(&port->serial->disc_mutex);
709} /* cypress_close */
710
711
712static int cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
713 const unsigned char *buf, int count)
714{
715 struct cypress_private *priv = usb_get_serial_port_data(port);
716
717 dbg("%s - port %d, %d bytes", __func__, port->number, count);
718
719 /* line control commands, which need to be executed immediately,
720 are not put into the buffer for obvious reasons.
721 */
722 if (priv->cmd_ctrl) {
723 count = 0;
724 goto finish;
725 }
726
727 if (!count)
728 return count;
729
730 count = kfifo_in_locked(&priv->write_fifo, buf, count, &priv->lock);
731
732finish:
733 cypress_send(port);
734
735 return count;
736} /* cypress_write */
737
738
739static void cypress_send(struct usb_serial_port *port)
740{
741 int count = 0, result, offset, actual_size;
742 struct cypress_private *priv = usb_get_serial_port_data(port);
743 unsigned long flags;
744
745 if (!priv->comm_is_ok)
746 return;
747
748 dbg("%s - port %d", __func__, port->number);
749 dbg("%s - interrupt out size is %d", __func__,
750 port->interrupt_out_size);
751
752 spin_lock_irqsave(&priv->lock, flags);
753 if (priv->write_urb_in_use) {
754 dbg("%s - can't write, urb in use", __func__);
755 spin_unlock_irqrestore(&priv->lock, flags);
756 return;
757 }
758 spin_unlock_irqrestore(&priv->lock, flags);
759
760 /* clear buffer */
761 memset(port->interrupt_out_urb->transfer_buffer, 0,
762 port->interrupt_out_size);
763
764 spin_lock_irqsave(&priv->lock, flags);
765 switch (priv->pkt_fmt) {
766 default:
767 case packet_format_1:
768 /* this is for the CY7C64013... */
769 offset = 2;
770 port->interrupt_out_buffer[0] = priv->line_control;
771 break;
772 case packet_format_2:
773 /* this is for the CY7C63743... */
774 offset = 1;
775 port->interrupt_out_buffer[0] = priv->line_control;
776 break;
777 }
778
779 if (priv->line_control & CONTROL_RESET)
780 priv->line_control &= ~CONTROL_RESET;
781
782 if (priv->cmd_ctrl) {
783 priv->cmd_count++;
784 dbg("%s - line control command being issued", __func__);
785 spin_unlock_irqrestore(&priv->lock, flags);
786 goto send;
787 } else
788 spin_unlock_irqrestore(&priv->lock, flags);
789
790 count = kfifo_out_locked(&priv->write_fifo,
791 &port->interrupt_out_buffer[offset],
792 port->interrupt_out_size - offset,
793 &priv->lock);
794 if (count == 0)
795 return;
796
797 switch (priv->pkt_fmt) {
798 default:
799 case packet_format_1:
800 port->interrupt_out_buffer[1] = count;
801 break;
802 case packet_format_2:
803 port->interrupt_out_buffer[0] |= count;
804 }
805
806 dbg("%s - count is %d", __func__, count);
807
808send:
809 spin_lock_irqsave(&priv->lock, flags);
810 priv->write_urb_in_use = 1;
811 spin_unlock_irqrestore(&priv->lock, flags);
812
813 if (priv->cmd_ctrl)
814 actual_size = 1;
815 else
816 actual_size = count +
817 (priv->pkt_fmt == packet_format_1 ? 2 : 1);
818
819 usb_serial_debug_data(debug, &port->dev, __func__,
820 port->interrupt_out_size,
821 port->interrupt_out_urb->transfer_buffer);
822
823 usb_fill_int_urb(port->interrupt_out_urb, port->serial->dev,
824 usb_sndintpipe(port->serial->dev, port->interrupt_out_endpointAddress),
825 port->interrupt_out_buffer, port->interrupt_out_size,
826 cypress_write_int_callback, port, priv->write_urb_interval);
827 result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC);
828 if (result) {
829 dev_err(&port->dev,
830 "%s - failed submitting write urb, error %d\n",
831 __func__, result);
832 priv->write_urb_in_use = 0;
833 cypress_set_dead(port);
834 }
835
836 spin_lock_irqsave(&priv->lock, flags);
837 if (priv->cmd_ctrl)
838 priv->cmd_ctrl = 0;
839
840 /* do not count the line control and size bytes */
841 priv->bytes_out += count;
842 spin_unlock_irqrestore(&priv->lock, flags);
843
844 usb_serial_port_softint(port);
845} /* cypress_send */
846
847
848/* returns how much space is available in the soft buffer */
849static int cypress_write_room(struct tty_struct *tty)
850{
851 struct usb_serial_port *port = tty->driver_data;
852 struct cypress_private *priv = usb_get_serial_port_data(port);
853 int room = 0;
854 unsigned long flags;
855
856 dbg("%s - port %d", __func__, port->number);
857
858 spin_lock_irqsave(&priv->lock, flags);
859 room = kfifo_avail(&priv->write_fifo);
860 spin_unlock_irqrestore(&priv->lock, flags);
861
862 dbg("%s - returns %d", __func__, room);
863 return room;
864}
865
866
867static int cypress_tiocmget(struct tty_struct *tty)
868{
869 struct usb_serial_port *port = tty->driver_data;
870 struct cypress_private *priv = usb_get_serial_port_data(port);
871 __u8 status, control;
872 unsigned int result = 0;
873 unsigned long flags;
874
875 dbg("%s - port %d", __func__, port->number);
876
877 spin_lock_irqsave(&priv->lock, flags);
878 control = priv->line_control;
879 status = priv->current_status;
880 spin_unlock_irqrestore(&priv->lock, flags);
881
882 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
883 | ((control & CONTROL_RTS) ? TIOCM_RTS : 0)
884 | ((status & UART_CTS) ? TIOCM_CTS : 0)
885 | ((status & UART_DSR) ? TIOCM_DSR : 0)
886 | ((status & UART_RI) ? TIOCM_RI : 0)
887 | ((status & UART_CD) ? TIOCM_CD : 0);
888
889 dbg("%s - result = %x", __func__, result);
890
891 return result;
892}
893
894
895static int cypress_tiocmset(struct tty_struct *tty,
896 unsigned int set, unsigned int clear)
897{
898 struct usb_serial_port *port = tty->driver_data;
899 struct cypress_private *priv = usb_get_serial_port_data(port);
900 unsigned long flags;
901
902 dbg("%s - port %d", __func__, port->number);
903
904 spin_lock_irqsave(&priv->lock, flags);
905 if (set & TIOCM_RTS)
906 priv->line_control |= CONTROL_RTS;
907 if (set & TIOCM_DTR)
908 priv->line_control |= CONTROL_DTR;
909 if (clear & TIOCM_RTS)
910 priv->line_control &= ~CONTROL_RTS;
911 if (clear & TIOCM_DTR)
912 priv->line_control &= ~CONTROL_DTR;
913 priv->cmd_ctrl = 1;
914 spin_unlock_irqrestore(&priv->lock, flags);
915
916 return cypress_write(tty, port, NULL, 0);
917}
918
919
920static int cypress_ioctl(struct tty_struct *tty,
921 unsigned int cmd, unsigned long arg)
922{
923 struct usb_serial_port *port = tty->driver_data;
924 struct cypress_private *priv = usb_get_serial_port_data(port);
925
926 dbg("%s - port %d, cmd 0x%.4x", __func__, port->number, cmd);
927
928 switch (cmd) {
929 /* This code comes from drivers/char/serial.c and ftdi_sio.c */
930 case TIOCMIWAIT:
931 while (priv != NULL) {
932 interruptible_sleep_on(&priv->delta_msr_wait);
933 /* see if a signal did it */
934 if (signal_pending(current))
935 return -ERESTARTSYS;
936 else {
937 char diff = priv->diff_status;
938 if (diff == 0)
939 return -EIO; /* no change => error */
940
941 /* consume all events */
942 priv->diff_status = 0;
943
944 /* return 0 if caller wanted to know about
945 these bits */
946 if (((arg & TIOCM_RNG) && (diff & UART_RI)) ||
947 ((arg & TIOCM_DSR) && (diff & UART_DSR)) ||
948 ((arg & TIOCM_CD) && (diff & UART_CD)) ||
949 ((arg & TIOCM_CTS) && (diff & UART_CTS)))
950 return 0;
951 /* otherwise caller can't care less about what
952 * happened, and so we continue to wait for
953 * more events.
954 */
955 }
956 }
957 return 0;
958 default:
959 break;
960 }
961 dbg("%s - arg not supported - it was 0x%04x - check include/asm/ioctls.h", __func__, cmd);
962 return -ENOIOCTLCMD;
963} /* cypress_ioctl */
964
965
966static void cypress_set_termios(struct tty_struct *tty,
967 struct usb_serial_port *port, struct ktermios *old_termios)
968{
969 struct cypress_private *priv = usb_get_serial_port_data(port);
970 int data_bits, stop_bits, parity_type, parity_enable;
971 unsigned cflag, iflag;
972 unsigned long flags;
973 __u8 oldlines;
974 int linechange = 0;
975
976 dbg("%s - port %d", __func__, port->number);
977
978 spin_lock_irqsave(&priv->lock, flags);
979 /* We can't clean this one up as we don't know the device type
980 early enough */
981 if (!priv->termios_initialized) {
982 if (priv->chiptype == CT_EARTHMATE) {
983 *(tty->termios) = tty_std_termios;
984 tty->termios->c_cflag = B4800 | CS8 | CREAD | HUPCL |
985 CLOCAL;
986 tty->termios->c_ispeed = 4800;
987 tty->termios->c_ospeed = 4800;
988 } else if (priv->chiptype == CT_CYPHIDCOM) {
989 *(tty->termios) = tty_std_termios;
990 tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL |
991 CLOCAL;
992 tty->termios->c_ispeed = 9600;
993 tty->termios->c_ospeed = 9600;
994 } else if (priv->chiptype == CT_CA42V2) {
995 *(tty->termios) = tty_std_termios;
996 tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL |
997 CLOCAL;
998 tty->termios->c_ispeed = 9600;
999 tty->termios->c_ospeed = 9600;
1000 }
1001 priv->termios_initialized = 1;
1002 }
1003 spin_unlock_irqrestore(&priv->lock, flags);
1004
1005 /* Unsupported features need clearing */
1006 tty->termios->c_cflag &= ~(CMSPAR|CRTSCTS);
1007
1008 cflag = tty->termios->c_cflag;
1009 iflag = tty->termios->c_iflag;
1010
1011 /* check if there are new settings */
1012 if (old_termios) {
1013 spin_lock_irqsave(&priv->lock, flags);
1014 priv->tmp_termios = *(tty->termios);
1015 spin_unlock_irqrestore(&priv->lock, flags);
1016 }
1017
1018 /* set number of data bits, parity, stop bits */
1019 /* when parity is disabled the parity type bit is ignored */
1020
1021 /* 1 means 2 stop bits, 0 means 1 stop bit */
1022 stop_bits = cflag & CSTOPB ? 1 : 0;
1023
1024 if (cflag & PARENB) {
1025 parity_enable = 1;
1026 /* 1 means odd parity, 0 means even parity */
1027 parity_type = cflag & PARODD ? 1 : 0;
1028 } else
1029 parity_enable = parity_type = 0;
1030
1031 switch (cflag & CSIZE) {
1032 case CS5:
1033 data_bits = 0;
1034 break;
1035 case CS6:
1036 data_bits = 1;
1037 break;
1038 case CS7:
1039 data_bits = 2;
1040 break;
1041 case CS8:
1042 data_bits = 3;
1043 break;
1044 default:
1045 dev_err(&port->dev, "%s - CSIZE was set, but not CS5-CS8\n",
1046 __func__);
1047 data_bits = 3;
1048 }
1049 spin_lock_irqsave(&priv->lock, flags);
1050 oldlines = priv->line_control;
1051 if ((cflag & CBAUD) == B0) {
1052 /* drop dtr and rts */
1053 dbg("%s - dropping the lines, baud rate 0bps", __func__);
1054 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
1055 } else
1056 priv->line_control = (CONTROL_DTR | CONTROL_RTS);
1057 spin_unlock_irqrestore(&priv->lock, flags);
1058
1059 dbg("%s - sending %d stop_bits, %d parity_enable, %d parity_type, "
1060 "%d data_bits (+5)", __func__, stop_bits,
1061 parity_enable, parity_type, data_bits);
1062
1063 cypress_serial_control(tty, port, tty_get_baud_rate(tty),
1064 data_bits, stop_bits,
1065 parity_enable, parity_type,
1066 0, CYPRESS_SET_CONFIG);
1067
1068 /* we perform a CYPRESS_GET_CONFIG so that the current settings are
1069 * filled into the private structure this should confirm that all is
1070 * working if it returns what we just set */
1071 cypress_serial_control(tty, port, 0, 0, 0, 0, 0, 0, CYPRESS_GET_CONFIG);
1072
1073 /* Here we can define custom tty settings for devices; the main tty
1074 * termios flag base comes from empeg.c */
1075
1076 spin_lock_irqsave(&priv->lock, flags);
1077 if (priv->chiptype == CT_EARTHMATE && priv->baud_rate == 4800) {
1078 dbg("Using custom termios settings for a baud rate of "
1079 "4800bps.");
1080 /* define custom termios settings for NMEA protocol */
1081
1082 tty->termios->c_iflag /* input modes - */
1083 &= ~(IGNBRK /* disable ignore break */
1084 | BRKINT /* disable break causes interrupt */
1085 | PARMRK /* disable mark parity errors */
1086 | ISTRIP /* disable clear high bit of input char */
1087 | INLCR /* disable translate NL to CR */
1088 | IGNCR /* disable ignore CR */
1089 | ICRNL /* disable translate CR to NL */
1090 | IXON); /* disable enable XON/XOFF flow control */
1091
1092 tty->termios->c_oflag /* output modes */
1093 &= ~OPOST; /* disable postprocess output char */
1094
1095 tty->termios->c_lflag /* line discipline modes */
1096 &= ~(ECHO /* disable echo input characters */
1097 | ECHONL /* disable echo new line */
1098 | ICANON /* disable erase, kill, werase, and rprnt
1099 special characters */
1100 | ISIG /* disable interrupt, quit, and suspend
1101 special characters */
1102 | IEXTEN); /* disable non-POSIX special characters */
1103 } /* CT_CYPHIDCOM: Application should handle this for device */
1104
1105 linechange = (priv->line_control != oldlines);
1106 spin_unlock_irqrestore(&priv->lock, flags);
1107
1108 /* if necessary, set lines */
1109 if (linechange) {
1110 priv->cmd_ctrl = 1;
1111 cypress_write(tty, port, NULL, 0);
1112 }
1113} /* cypress_set_termios */
1114
1115
1116/* returns amount of data still left in soft buffer */
1117static int cypress_chars_in_buffer(struct tty_struct *tty)
1118{
1119 struct usb_serial_port *port = tty->driver_data;
1120 struct cypress_private *priv = usb_get_serial_port_data(port);
1121 int chars = 0;
1122 unsigned long flags;
1123
1124 dbg("%s - port %d", __func__, port->number);
1125
1126 spin_lock_irqsave(&priv->lock, flags);
1127 chars = kfifo_len(&priv->write_fifo);
1128 spin_unlock_irqrestore(&priv->lock, flags);
1129
1130 dbg("%s - returns %d", __func__, chars);
1131 return chars;
1132}
1133
1134
1135static void cypress_throttle(struct tty_struct *tty)
1136{
1137 struct usb_serial_port *port = tty->driver_data;
1138 struct cypress_private *priv = usb_get_serial_port_data(port);
1139
1140 dbg("%s - port %d", __func__, port->number);
1141
1142 spin_lock_irq(&priv->lock);
1143 priv->rx_flags = THROTTLED;
1144 spin_unlock_irq(&priv->lock);
1145}
1146
1147
1148static void cypress_unthrottle(struct tty_struct *tty)
1149{
1150 struct usb_serial_port *port = tty->driver_data;
1151 struct cypress_private *priv = usb_get_serial_port_data(port);
1152 int actually_throttled, result;
1153
1154 dbg("%s - port %d", __func__, port->number);
1155
1156 spin_lock_irq(&priv->lock);
1157 actually_throttled = priv->rx_flags & ACTUALLY_THROTTLED;
1158 priv->rx_flags = 0;
1159 spin_unlock_irq(&priv->lock);
1160
1161 if (!priv->comm_is_ok)
1162 return;
1163
1164 if (actually_throttled) {
1165 port->interrupt_in_urb->dev = port->serial->dev;
1166
1167 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
1168 if (result) {
1169 dev_err(&port->dev, "%s - failed submitting read urb, "
1170 "error %d\n", __func__, result);
1171 cypress_set_dead(port);
1172 }
1173 }
1174}
1175
1176
1177static void cypress_read_int_callback(struct urb *urb)
1178{
1179 struct usb_serial_port *port = urb->context;
1180 struct cypress_private *priv = usb_get_serial_port_data(port);
1181 struct tty_struct *tty;
1182 unsigned char *data = urb->transfer_buffer;
1183 unsigned long flags;
1184 char tty_flag = TTY_NORMAL;
1185 int havedata = 0;
1186 int bytes = 0;
1187 int result;
1188 int i = 0;
1189 int status = urb->status;
1190
1191 dbg("%s - port %d", __func__, port->number);
1192
1193 switch (status) {
1194 case 0: /* success */
1195 break;
1196 case -ECONNRESET:
1197 case -ENOENT:
1198 case -ESHUTDOWN:
1199 /* precursor to disconnect so just go away */
1200 return;
1201 case -EPIPE:
1202 /* Can't call usb_clear_halt while in_interrupt */
1203 /* FALLS THROUGH */
1204 default:
1205 /* something ugly is going on... */
1206 dev_err(&urb->dev->dev,
1207 "%s - unexpected nonzero read status received: %d\n",
1208 __func__, status);
1209 cypress_set_dead(port);
1210 return;
1211 }
1212
1213 spin_lock_irqsave(&priv->lock, flags);
1214 if (priv->rx_flags & THROTTLED) {
1215 dbg("%s - now throttling", __func__);
1216 priv->rx_flags |= ACTUALLY_THROTTLED;
1217 spin_unlock_irqrestore(&priv->lock, flags);
1218 return;
1219 }
1220 spin_unlock_irqrestore(&priv->lock, flags);
1221
1222 tty = tty_port_tty_get(&port->port);
1223 if (!tty) {
1224 dbg("%s - bad tty pointer - exiting", __func__);
1225 return;
1226 }
1227
1228 spin_lock_irqsave(&priv->lock, flags);
1229 result = urb->actual_length;
1230 switch (priv->pkt_fmt) {
1231 default:
1232 case packet_format_1:
1233 /* This is for the CY7C64013... */
1234 priv->current_status = data[0] & 0xF8;
1235 bytes = data[1] + 2;
1236 i = 2;
1237 if (bytes > 2)
1238 havedata = 1;
1239 break;
1240 case packet_format_2:
1241 /* This is for the CY7C63743... */
1242 priv->current_status = data[0] & 0xF8;
1243 bytes = (data[0] & 0x07) + 1;
1244 i = 1;
1245 if (bytes > 1)
1246 havedata = 1;
1247 break;
1248 }
1249 spin_unlock_irqrestore(&priv->lock, flags);
1250 if (result < bytes) {
1251 dbg("%s - wrong packet size - received %d bytes but packet "
1252 "said %d bytes", __func__, result, bytes);
1253 goto continue_read;
1254 }
1255
1256 usb_serial_debug_data(debug, &port->dev, __func__,
1257 urb->actual_length, data);
1258
1259 spin_lock_irqsave(&priv->lock, flags);
1260 /* check to see if status has changed */
1261 if (priv->current_status != priv->prev_status) {
1262 priv->diff_status |= priv->current_status ^
1263 priv->prev_status;
1264 wake_up_interruptible(&priv->delta_msr_wait);
1265 priv->prev_status = priv->current_status;
1266 }
1267 spin_unlock_irqrestore(&priv->lock, flags);
1268
1269 /* hangup, as defined in acm.c... this might be a bad place for it
1270 * though */
1271 if (tty && !(tty->termios->c_cflag & CLOCAL) &&
1272 !(priv->current_status & UART_CD)) {
1273 dbg("%s - calling hangup", __func__);
1274 tty_hangup(tty);
1275 goto continue_read;
1276 }
1277
1278 /* There is one error bit... I'm assuming it is a parity error
1279 * indicator as the generic firmware will set this bit to 1 if a
1280 * parity error occurs.
1281 * I can not find reference to any other error events. */
1282 spin_lock_irqsave(&priv->lock, flags);
1283 if (priv->current_status & CYP_ERROR) {
1284 spin_unlock_irqrestore(&priv->lock, flags);
1285 tty_flag = TTY_PARITY;
1286 dbg("%s - Parity Error detected", __func__);
1287 } else
1288 spin_unlock_irqrestore(&priv->lock, flags);
1289
1290 /* process read if there is data other than line status */
1291 if (tty && bytes > i) {
1292 tty_insert_flip_string_fixed_flag(tty, data + i,
1293 tty_flag, bytes - i);
1294 tty_flip_buffer_push(tty);
1295 }
1296
1297 spin_lock_irqsave(&priv->lock, flags);
1298 /* control and status byte(s) are also counted */
1299 priv->bytes_in += bytes;
1300 spin_unlock_irqrestore(&priv->lock, flags);
1301
1302continue_read:
1303 tty_kref_put(tty);
1304
1305 /* Continue trying to always read */
1306
1307 if (priv->comm_is_ok) {
1308 usb_fill_int_urb(port->interrupt_in_urb, port->serial->dev,
1309 usb_rcvintpipe(port->serial->dev,
1310 port->interrupt_in_endpointAddress),
1311 port->interrupt_in_urb->transfer_buffer,
1312 port->interrupt_in_urb->transfer_buffer_length,
1313 cypress_read_int_callback, port,
1314 priv->read_urb_interval);
1315 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
1316 if (result && result != -EPERM) {
1317 dev_err(&urb->dev->dev, "%s - failed resubmitting "
1318 "read urb, error %d\n", __func__,
1319 result);
1320 cypress_set_dead(port);
1321 }
1322 }
1323} /* cypress_read_int_callback */
1324
1325
1326static void cypress_write_int_callback(struct urb *urb)
1327{
1328 struct usb_serial_port *port = urb->context;
1329 struct cypress_private *priv = usb_get_serial_port_data(port);
1330 int result;
1331 int status = urb->status;
1332
1333 dbg("%s - port %d", __func__, port->number);
1334
1335 switch (status) {
1336 case 0:
1337 /* success */
1338 break;
1339 case -ECONNRESET:
1340 case -ENOENT:
1341 case -ESHUTDOWN:
1342 /* this urb is terminated, clean up */
1343 dbg("%s - urb shutting down with status: %d",
1344 __func__, status);
1345 priv->write_urb_in_use = 0;
1346 return;
1347 case -EPIPE: /* no break needed; clear halt and resubmit */
1348 if (!priv->comm_is_ok)
1349 break;
1350 usb_clear_halt(port->serial->dev, 0x02);
1351 /* error in the urb, so we have to resubmit it */
1352 dbg("%s - nonzero write bulk status received: %d",
1353 __func__, status);
1354 port->interrupt_out_urb->transfer_buffer_length = 1;
1355 port->interrupt_out_urb->dev = port->serial->dev;
1356 result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC);
1357 if (!result)
1358 return;
1359 dev_err(&urb->dev->dev,
1360 "%s - failed resubmitting write urb, error %d\n",
1361 __func__, result);
1362 cypress_set_dead(port);
1363 break;
1364 default:
1365 dev_err(&urb->dev->dev,
1366 "%s - unexpected nonzero write status received: %d\n",
1367 __func__, status);
1368 cypress_set_dead(port);
1369 break;
1370 }
1371 priv->write_urb_in_use = 0;
1372
1373 /* send any buffered data */
1374 cypress_send(port);
1375}
1376
1377
1378/*****************************************************************************
1379 * Module functions
1380 *****************************************************************************/
1381
1382static int __init cypress_init(void)
1383{
1384 int retval;
1385
1386 dbg("%s", __func__);
1387
1388 retval = usb_serial_register(&cypress_earthmate_device);
1389 if (retval)
1390 goto failed_em_register;
1391 retval = usb_serial_register(&cypress_hidcom_device);
1392 if (retval)
1393 goto failed_hidcom_register;
1394 retval = usb_serial_register(&cypress_ca42v2_device);
1395 if (retval)
1396 goto failed_ca42v2_register;
1397 retval = usb_register(&cypress_driver);
1398 if (retval)
1399 goto failed_usb_register;
1400
1401 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
1402 DRIVER_DESC "\n");
1403 return 0;
1404
1405failed_usb_register:
1406 usb_serial_deregister(&cypress_ca42v2_device);
1407failed_ca42v2_register:
1408 usb_serial_deregister(&cypress_hidcom_device);
1409failed_hidcom_register:
1410 usb_serial_deregister(&cypress_earthmate_device);
1411failed_em_register:
1412 return retval;
1413}
1414
1415
1416static void __exit cypress_exit(void)
1417{
1418 dbg("%s", __func__);
1419
1420 usb_deregister(&cypress_driver);
1421 usb_serial_deregister(&cypress_earthmate_device);
1422 usb_serial_deregister(&cypress_hidcom_device);
1423 usb_serial_deregister(&cypress_ca42v2_device);
1424}
1425
1426
1427module_init(cypress_init);
1428module_exit(cypress_exit);
1429
1430MODULE_AUTHOR(DRIVER_AUTHOR);
1431MODULE_DESCRIPTION(DRIVER_DESC);
1432MODULE_VERSION(DRIVER_VERSION);
1433MODULE_LICENSE("GPL");
1434
1435module_param(debug, bool, S_IRUGO | S_IWUSR);
1436MODULE_PARM_DESC(debug, "Debug enabled or not");
1437module_param(stats, bool, S_IRUGO | S_IWUSR);
1438MODULE_PARM_DESC(stats, "Enable statistics or not");
1439module_param(interval, int, S_IRUGO | S_IWUSR);
1440MODULE_PARM_DESC(interval, "Overrides interrupt interval");
1441module_param(unstable_bauds, bool, S_IRUGO | S_IWUSR);
1442MODULE_PARM_DESC(unstable_bauds, "Allow unstable baud rates");
1/*
2 * USB Cypress M8 driver
3 *
4 * Copyright (C) 2004
5 * Lonnie Mendez (dignome@gmail.com)
6 * Copyright (C) 2003,2004
7 * Neil Whelchel (koyama@firstlight.net)
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * See Documentation/usb/usb-serial.txt for more information on using this
15 * driver
16 *
17 * See http://geocities.com/i0xox0i for information on this driver and the
18 * earthmate usb device.
19 */
20
21/* Thanks to Neil Whelchel for writing the first cypress m8 implementation
22 for linux. */
23/* Thanks to cypress for providing references for the hid reports. */
24/* Thanks to Jiang Zhang for providing links and for general help. */
25/* Code originates and was built up from ftdi_sio, belkin, pl2303 and others.*/
26
27
28#include <linux/kernel.h>
29#include <linux/errno.h>
30#include <linux/slab.h>
31#include <linux/tty.h>
32#include <linux/tty_driver.h>
33#include <linux/tty_flip.h>
34#include <linux/module.h>
35#include <linux/moduleparam.h>
36#include <linux/spinlock.h>
37#include <linux/usb.h>
38#include <linux/usb/serial.h>
39#include <linux/serial.h>
40#include <linux/kfifo.h>
41#include <linux/delay.h>
42#include <linux/uaccess.h>
43#include <asm/unaligned.h>
44
45#include "cypress_m8.h"
46
47
48static bool stats;
49static int interval;
50static bool unstable_bauds;
51
52#define DRIVER_AUTHOR "Lonnie Mendez <dignome@gmail.com>, Neil Whelchel <koyama@firstlight.net>"
53#define DRIVER_DESC "Cypress USB to Serial Driver"
54
55/* write buffer size defines */
56#define CYPRESS_BUF_SIZE 1024
57
58static const struct usb_device_id id_table_earthmate[] = {
59 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
60 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
61 { } /* Terminating entry */
62};
63
64static const struct usb_device_id id_table_cyphidcomrs232[] = {
65 { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
66 { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) },
67 { USB_DEVICE(VENDOR_ID_FRWD, PRODUCT_ID_CYPHIDCOM_FRWD) },
68 { } /* Terminating entry */
69};
70
71static const struct usb_device_id id_table_nokiaca42v2[] = {
72 { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
73 { } /* Terminating entry */
74};
75
76static const struct usb_device_id id_table_combined[] = {
77 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
78 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
79 { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
80 { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) },
81 { USB_DEVICE(VENDOR_ID_FRWD, PRODUCT_ID_CYPHIDCOM_FRWD) },
82 { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
83 { } /* Terminating entry */
84};
85
86MODULE_DEVICE_TABLE(usb, id_table_combined);
87
88enum packet_format {
89 packet_format_1, /* b0:status, b1:payload count */
90 packet_format_2 /* b0[7:3]:status, b0[2:0]:payload count */
91};
92
93struct cypress_private {
94 spinlock_t lock; /* private lock */
95 int chiptype; /* identifier of device, for quirks/etc */
96 int bytes_in; /* used for statistics */
97 int bytes_out; /* used for statistics */
98 int cmd_count; /* used for statistics */
99 int cmd_ctrl; /* always set this to 1 before issuing a command */
100 struct kfifo write_fifo; /* write fifo */
101 int write_urb_in_use; /* write urb in use indicator */
102 int write_urb_interval; /* interval to use for write urb */
103 int read_urb_interval; /* interval to use for read urb */
104 int comm_is_ok; /* true if communication is (still) ok */
105 int termios_initialized;
106 __u8 line_control; /* holds dtr / rts value */
107 __u8 current_status; /* received from last read - info on dsr,cts,cd,ri,etc */
108 __u8 current_config; /* stores the current configuration byte */
109 __u8 rx_flags; /* throttling - used from whiteheat/ftdi_sio */
110 enum packet_format pkt_fmt; /* format to use for packet send / receive */
111 int get_cfg_unsafe; /* If true, the CYPRESS_GET_CONFIG is unsafe */
112 int baud_rate; /* stores current baud rate in
113 integer form */
114 int isthrottled; /* if throttled, discard reads */
115 char prev_status; /* used for TIOCMIWAIT */
116 /* we pass a pointer to this as the argument sent to
117 cypress_set_termios old_termios */
118 struct ktermios tmp_termios; /* stores the old termios settings */
119};
120
121/* function prototypes for the Cypress USB to serial device */
122static int cypress_earthmate_port_probe(struct usb_serial_port *port);
123static int cypress_hidcom_port_probe(struct usb_serial_port *port);
124static int cypress_ca42v2_port_probe(struct usb_serial_port *port);
125static int cypress_port_remove(struct usb_serial_port *port);
126static int cypress_open(struct tty_struct *tty, struct usb_serial_port *port);
127static void cypress_close(struct usb_serial_port *port);
128static void cypress_dtr_rts(struct usb_serial_port *port, int on);
129static int cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
130 const unsigned char *buf, int count);
131static void cypress_send(struct usb_serial_port *port);
132static int cypress_write_room(struct tty_struct *tty);
133static void cypress_set_termios(struct tty_struct *tty,
134 struct usb_serial_port *port, struct ktermios *old);
135static int cypress_tiocmget(struct tty_struct *tty);
136static int cypress_tiocmset(struct tty_struct *tty,
137 unsigned int set, unsigned int clear);
138static int cypress_chars_in_buffer(struct tty_struct *tty);
139static void cypress_throttle(struct tty_struct *tty);
140static void cypress_unthrottle(struct tty_struct *tty);
141static void cypress_set_dead(struct usb_serial_port *port);
142static void cypress_read_int_callback(struct urb *urb);
143static void cypress_write_int_callback(struct urb *urb);
144
145static struct usb_serial_driver cypress_earthmate_device = {
146 .driver = {
147 .owner = THIS_MODULE,
148 .name = "earthmate",
149 },
150 .description = "DeLorme Earthmate USB",
151 .id_table = id_table_earthmate,
152 .num_ports = 1,
153 .port_probe = cypress_earthmate_port_probe,
154 .port_remove = cypress_port_remove,
155 .open = cypress_open,
156 .close = cypress_close,
157 .dtr_rts = cypress_dtr_rts,
158 .write = cypress_write,
159 .write_room = cypress_write_room,
160 .set_termios = cypress_set_termios,
161 .tiocmget = cypress_tiocmget,
162 .tiocmset = cypress_tiocmset,
163 .tiocmiwait = usb_serial_generic_tiocmiwait,
164 .chars_in_buffer = cypress_chars_in_buffer,
165 .throttle = cypress_throttle,
166 .unthrottle = cypress_unthrottle,
167 .read_int_callback = cypress_read_int_callback,
168 .write_int_callback = cypress_write_int_callback,
169};
170
171static struct usb_serial_driver cypress_hidcom_device = {
172 .driver = {
173 .owner = THIS_MODULE,
174 .name = "cyphidcom",
175 },
176 .description = "HID->COM RS232 Adapter",
177 .id_table = id_table_cyphidcomrs232,
178 .num_ports = 1,
179 .port_probe = cypress_hidcom_port_probe,
180 .port_remove = cypress_port_remove,
181 .open = cypress_open,
182 .close = cypress_close,
183 .dtr_rts = cypress_dtr_rts,
184 .write = cypress_write,
185 .write_room = cypress_write_room,
186 .set_termios = cypress_set_termios,
187 .tiocmget = cypress_tiocmget,
188 .tiocmset = cypress_tiocmset,
189 .tiocmiwait = usb_serial_generic_tiocmiwait,
190 .chars_in_buffer = cypress_chars_in_buffer,
191 .throttle = cypress_throttle,
192 .unthrottle = cypress_unthrottle,
193 .read_int_callback = cypress_read_int_callback,
194 .write_int_callback = cypress_write_int_callback,
195};
196
197static struct usb_serial_driver cypress_ca42v2_device = {
198 .driver = {
199 .owner = THIS_MODULE,
200 .name = "nokiaca42v2",
201 },
202 .description = "Nokia CA-42 V2 Adapter",
203 .id_table = id_table_nokiaca42v2,
204 .num_ports = 1,
205 .port_probe = cypress_ca42v2_port_probe,
206 .port_remove = cypress_port_remove,
207 .open = cypress_open,
208 .close = cypress_close,
209 .dtr_rts = cypress_dtr_rts,
210 .write = cypress_write,
211 .write_room = cypress_write_room,
212 .set_termios = cypress_set_termios,
213 .tiocmget = cypress_tiocmget,
214 .tiocmset = cypress_tiocmset,
215 .tiocmiwait = usb_serial_generic_tiocmiwait,
216 .chars_in_buffer = cypress_chars_in_buffer,
217 .throttle = cypress_throttle,
218 .unthrottle = cypress_unthrottle,
219 .read_int_callback = cypress_read_int_callback,
220 .write_int_callback = cypress_write_int_callback,
221};
222
223static struct usb_serial_driver * const serial_drivers[] = {
224 &cypress_earthmate_device, &cypress_hidcom_device,
225 &cypress_ca42v2_device, NULL
226};
227
228/*****************************************************************************
229 * Cypress serial helper functions
230 *****************************************************************************/
231
232/* FRWD Dongle hidcom needs to skip reset and speed checks */
233static inline bool is_frwd(struct usb_device *dev)
234{
235 return ((le16_to_cpu(dev->descriptor.idVendor) == VENDOR_ID_FRWD) &&
236 (le16_to_cpu(dev->descriptor.idProduct) == PRODUCT_ID_CYPHIDCOM_FRWD));
237}
238
239static int analyze_baud_rate(struct usb_serial_port *port, speed_t new_rate)
240{
241 struct cypress_private *priv;
242 priv = usb_get_serial_port_data(port);
243
244 if (unstable_bauds)
245 return new_rate;
246
247 /* FRWD Dongle uses 115200 bps */
248 if (is_frwd(port->serial->dev))
249 return new_rate;
250
251 /*
252 * The general purpose firmware for the Cypress M8 allows for
253 * a maximum speed of 57600bps (I have no idea whether DeLorme
254 * chose to use the general purpose firmware or not), if you
255 * need to modify this speed setting for your own project
256 * please add your own chiptype and modify the code likewise.
257 * The Cypress HID->COM device will work successfully up to
258 * 115200bps (but the actual throughput is around 3kBps).
259 */
260 if (port->serial->dev->speed == USB_SPEED_LOW) {
261 /*
262 * Mike Isely <isely@pobox.com> 2-Feb-2008: The
263 * Cypress app note that describes this mechanism
264 * states the the low-speed part can't handle more
265 * than 800 bytes/sec, in which case 4800 baud is the
266 * safest speed for a part like that.
267 */
268 if (new_rate > 4800) {
269 dev_dbg(&port->dev,
270 "%s - failed setting baud rate, device incapable speed %d\n",
271 __func__, new_rate);
272 return -1;
273 }
274 }
275 switch (priv->chiptype) {
276 case CT_EARTHMATE:
277 if (new_rate <= 600) {
278 /* 300 and 600 baud rates are supported under
279 * the generic firmware, but are not used with
280 * NMEA and SiRF protocols */
281 dev_dbg(&port->dev,
282 "%s - failed setting baud rate, unsupported speed of %d on Earthmate GPS\n",
283 __func__, new_rate);
284 return -1;
285 }
286 break;
287 default:
288 break;
289 }
290 return new_rate;
291}
292
293
294/* This function can either set or retrieve the current serial line settings */
295static int cypress_serial_control(struct tty_struct *tty,
296 struct usb_serial_port *port, speed_t baud_rate, int data_bits,
297 int stop_bits, int parity_enable, int parity_type, int reset,
298 int cypress_request_type)
299{
300 int new_baudrate = 0, retval = 0, tries = 0;
301 struct cypress_private *priv;
302 struct device *dev = &port->dev;
303 u8 *feature_buffer;
304 const unsigned int feature_len = 5;
305 unsigned long flags;
306
307 priv = usb_get_serial_port_data(port);
308
309 if (!priv->comm_is_ok)
310 return -ENODEV;
311
312 feature_buffer = kcalloc(feature_len, sizeof(u8), GFP_KERNEL);
313 if (!feature_buffer)
314 return -ENOMEM;
315
316 switch (cypress_request_type) {
317 case CYPRESS_SET_CONFIG:
318 /* 0 means 'Hang up' so doesn't change the true bit rate */
319 new_baudrate = priv->baud_rate;
320 if (baud_rate && baud_rate != priv->baud_rate) {
321 dev_dbg(dev, "%s - baud rate is changing\n", __func__);
322 retval = analyze_baud_rate(port, baud_rate);
323 if (retval >= 0) {
324 new_baudrate = retval;
325 dev_dbg(dev, "%s - New baud rate set to %d\n",
326 __func__, new_baudrate);
327 }
328 }
329 dev_dbg(dev, "%s - baud rate is being sent as %d\n", __func__,
330 new_baudrate);
331
332 /* fill the feature_buffer with new configuration */
333 put_unaligned_le32(new_baudrate, feature_buffer);
334 feature_buffer[4] |= data_bits; /* assign data bits in 2 bit space ( max 3 ) */
335 /* 1 bit gap */
336 feature_buffer[4] |= (stop_bits << 3); /* assign stop bits in 1 bit space */
337 feature_buffer[4] |= (parity_enable << 4); /* assign parity flag in 1 bit space */
338 feature_buffer[4] |= (parity_type << 5); /* assign parity type in 1 bit space */
339 /* 1 bit gap */
340 feature_buffer[4] |= (reset << 7); /* assign reset at end of byte, 1 bit space */
341
342 dev_dbg(dev, "%s - device is being sent this feature report:\n", __func__);
343 dev_dbg(dev, "%s - %02X - %02X - %02X - %02X - %02X\n", __func__,
344 feature_buffer[0], feature_buffer[1],
345 feature_buffer[2], feature_buffer[3],
346 feature_buffer[4]);
347
348 do {
349 retval = usb_control_msg(port->serial->dev,
350 usb_sndctrlpipe(port->serial->dev, 0),
351 HID_REQ_SET_REPORT,
352 USB_DIR_OUT | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
353 0x0300, 0, feature_buffer,
354 feature_len, 500);
355
356 if (tries++ >= 3)
357 break;
358
359 } while (retval != feature_len &&
360 retval != -ENODEV);
361
362 if (retval != feature_len) {
363 dev_err(dev, "%s - failed sending serial line settings - %d\n",
364 __func__, retval);
365 cypress_set_dead(port);
366 } else {
367 spin_lock_irqsave(&priv->lock, flags);
368 priv->baud_rate = new_baudrate;
369 priv->current_config = feature_buffer[4];
370 spin_unlock_irqrestore(&priv->lock, flags);
371 /* If we asked for a speed change encode it */
372 if (baud_rate)
373 tty_encode_baud_rate(tty,
374 new_baudrate, new_baudrate);
375 }
376 break;
377 case CYPRESS_GET_CONFIG:
378 if (priv->get_cfg_unsafe) {
379 /* Not implemented for this device,
380 and if we try to do it we're likely
381 to crash the hardware. */
382 retval = -ENOTTY;
383 goto out;
384 }
385 dev_dbg(dev, "%s - retreiving serial line settings\n", __func__);
386 do {
387 retval = usb_control_msg(port->serial->dev,
388 usb_rcvctrlpipe(port->serial->dev, 0),
389 HID_REQ_GET_REPORT,
390 USB_DIR_IN | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
391 0x0300, 0, feature_buffer,
392 feature_len, 500);
393
394 if (tries++ >= 3)
395 break;
396 } while (retval != feature_len
397 && retval != -ENODEV);
398
399 if (retval != feature_len) {
400 dev_err(dev, "%s - failed to retrieve serial line settings - %d\n",
401 __func__, retval);
402 cypress_set_dead(port);
403 goto out;
404 } else {
405 spin_lock_irqsave(&priv->lock, flags);
406 /* store the config in one byte, and later
407 use bit masks to check values */
408 priv->current_config = feature_buffer[4];
409 priv->baud_rate = get_unaligned_le32(feature_buffer);
410 spin_unlock_irqrestore(&priv->lock, flags);
411 }
412 }
413 spin_lock_irqsave(&priv->lock, flags);
414 ++priv->cmd_count;
415 spin_unlock_irqrestore(&priv->lock, flags);
416out:
417 kfree(feature_buffer);
418 return retval;
419} /* cypress_serial_control */
420
421
422static void cypress_set_dead(struct usb_serial_port *port)
423{
424 struct cypress_private *priv = usb_get_serial_port_data(port);
425 unsigned long flags;
426
427 spin_lock_irqsave(&priv->lock, flags);
428 if (!priv->comm_is_ok) {
429 spin_unlock_irqrestore(&priv->lock, flags);
430 return;
431 }
432 priv->comm_is_ok = 0;
433 spin_unlock_irqrestore(&priv->lock, flags);
434
435 dev_err(&port->dev, "cypress_m8 suspending failing port %d - "
436 "interval might be too short\n", port->port_number);
437}
438
439
440/*****************************************************************************
441 * Cypress serial driver functions
442 *****************************************************************************/
443
444
445static int cypress_generic_port_probe(struct usb_serial_port *port)
446{
447 struct usb_serial *serial = port->serial;
448 struct cypress_private *priv;
449
450 if (!port->interrupt_out_urb || !port->interrupt_in_urb) {
451 dev_err(&port->dev, "required endpoint is missing\n");
452 return -ENODEV;
453 }
454
455 priv = kzalloc(sizeof(struct cypress_private), GFP_KERNEL);
456 if (!priv)
457 return -ENOMEM;
458
459 priv->comm_is_ok = !0;
460 spin_lock_init(&priv->lock);
461 if (kfifo_alloc(&priv->write_fifo, CYPRESS_BUF_SIZE, GFP_KERNEL)) {
462 kfree(priv);
463 return -ENOMEM;
464 }
465
466 /* Skip reset for FRWD device. It is a workaound:
467 device hangs if it receives SET_CONFIGURE in Configured
468 state. */
469 if (!is_frwd(serial->dev))
470 usb_reset_configuration(serial->dev);
471
472 priv->cmd_ctrl = 0;
473 priv->line_control = 0;
474 priv->termios_initialized = 0;
475 priv->rx_flags = 0;
476 /* Default packet format setting is determined by packet size.
477 Anything with a size larger then 9 must have a separate
478 count field since the 3 bit count field is otherwise too
479 small. Otherwise we can use the slightly more compact
480 format. This is in accordance with the cypress_m8 serial
481 converter app note. */
482 if (port->interrupt_out_size > 9)
483 priv->pkt_fmt = packet_format_1;
484 else
485 priv->pkt_fmt = packet_format_2;
486
487 if (interval > 0) {
488 priv->write_urb_interval = interval;
489 priv->read_urb_interval = interval;
490 dev_dbg(&port->dev, "%s - read & write intervals forced to %d\n",
491 __func__, interval);
492 } else {
493 priv->write_urb_interval = port->interrupt_out_urb->interval;
494 priv->read_urb_interval = port->interrupt_in_urb->interval;
495 dev_dbg(&port->dev, "%s - intervals: read=%d write=%d\n",
496 __func__, priv->read_urb_interval,
497 priv->write_urb_interval);
498 }
499 usb_set_serial_port_data(port, priv);
500
501 port->port.drain_delay = 256;
502
503 return 0;
504}
505
506
507static int cypress_earthmate_port_probe(struct usb_serial_port *port)
508{
509 struct usb_serial *serial = port->serial;
510 struct cypress_private *priv;
511 int ret;
512
513 ret = cypress_generic_port_probe(port);
514 if (ret) {
515 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
516 return ret;
517 }
518
519 priv = usb_get_serial_port_data(port);
520 priv->chiptype = CT_EARTHMATE;
521 /* All Earthmate devices use the separated-count packet
522 format! Idiotic. */
523 priv->pkt_fmt = packet_format_1;
524 if (serial->dev->descriptor.idProduct !=
525 cpu_to_le16(PRODUCT_ID_EARTHMATEUSB)) {
526 /* The old original USB Earthmate seemed able to
527 handle GET_CONFIG requests; everything they've
528 produced since that time crashes if this command is
529 attempted :-( */
530 dev_dbg(&port->dev,
531 "%s - Marking this device as unsafe for GET_CONFIG commands\n",
532 __func__);
533 priv->get_cfg_unsafe = !0;
534 }
535
536 return 0;
537}
538
539static int cypress_hidcom_port_probe(struct usb_serial_port *port)
540{
541 struct cypress_private *priv;
542 int ret;
543
544 ret = cypress_generic_port_probe(port);
545 if (ret) {
546 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
547 return ret;
548 }
549
550 priv = usb_get_serial_port_data(port);
551 priv->chiptype = CT_CYPHIDCOM;
552
553 return 0;
554}
555
556static int cypress_ca42v2_port_probe(struct usb_serial_port *port)
557{
558 struct cypress_private *priv;
559 int ret;
560
561 ret = cypress_generic_port_probe(port);
562 if (ret) {
563 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
564 return ret;
565 }
566
567 priv = usb_get_serial_port_data(port);
568 priv->chiptype = CT_CA42V2;
569
570 return 0;
571}
572
573static int cypress_port_remove(struct usb_serial_port *port)
574{
575 struct cypress_private *priv;
576
577 priv = usb_get_serial_port_data(port);
578
579 kfifo_free(&priv->write_fifo);
580 kfree(priv);
581
582 return 0;
583}
584
585static int cypress_open(struct tty_struct *tty, struct usb_serial_port *port)
586{
587 struct cypress_private *priv = usb_get_serial_port_data(port);
588 struct usb_serial *serial = port->serial;
589 unsigned long flags;
590 int result = 0;
591
592 if (!priv->comm_is_ok)
593 return -EIO;
594
595 /* clear halts before open */
596 usb_clear_halt(serial->dev, 0x81);
597 usb_clear_halt(serial->dev, 0x02);
598
599 spin_lock_irqsave(&priv->lock, flags);
600 /* reset read/write statistics */
601 priv->bytes_in = 0;
602 priv->bytes_out = 0;
603 priv->cmd_count = 0;
604 priv->rx_flags = 0;
605 spin_unlock_irqrestore(&priv->lock, flags);
606
607 /* Set termios */
608 cypress_send(port);
609
610 if (tty)
611 cypress_set_termios(tty, port, &priv->tmp_termios);
612
613 /* setup the port and start reading from the device */
614 usb_fill_int_urb(port->interrupt_in_urb, serial->dev,
615 usb_rcvintpipe(serial->dev, port->interrupt_in_endpointAddress),
616 port->interrupt_in_urb->transfer_buffer,
617 port->interrupt_in_urb->transfer_buffer_length,
618 cypress_read_int_callback, port, priv->read_urb_interval);
619 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
620
621 if (result) {
622 dev_err(&port->dev,
623 "%s - failed submitting read urb, error %d\n",
624 __func__, result);
625 cypress_set_dead(port);
626 }
627
628 return result;
629} /* cypress_open */
630
631static void cypress_dtr_rts(struct usb_serial_port *port, int on)
632{
633 struct cypress_private *priv = usb_get_serial_port_data(port);
634 /* drop dtr and rts */
635 spin_lock_irq(&priv->lock);
636 if (on == 0)
637 priv->line_control = 0;
638 else
639 priv->line_control = CONTROL_DTR | CONTROL_RTS;
640 priv->cmd_ctrl = 1;
641 spin_unlock_irq(&priv->lock);
642 cypress_write(NULL, port, NULL, 0);
643}
644
645static void cypress_close(struct usb_serial_port *port)
646{
647 struct cypress_private *priv = usb_get_serial_port_data(port);
648 unsigned long flags;
649
650 spin_lock_irqsave(&priv->lock, flags);
651 kfifo_reset_out(&priv->write_fifo);
652 spin_unlock_irqrestore(&priv->lock, flags);
653
654 dev_dbg(&port->dev, "%s - stopping urbs\n", __func__);
655 usb_kill_urb(port->interrupt_in_urb);
656 usb_kill_urb(port->interrupt_out_urb);
657
658 if (stats)
659 dev_info(&port->dev, "Statistics: %d Bytes In | %d Bytes Out | %d Commands Issued\n",
660 priv->bytes_in, priv->bytes_out, priv->cmd_count);
661} /* cypress_close */
662
663
664static int cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
665 const unsigned char *buf, int count)
666{
667 struct cypress_private *priv = usb_get_serial_port_data(port);
668
669 dev_dbg(&port->dev, "%s - %d bytes\n", __func__, count);
670
671 /* line control commands, which need to be executed immediately,
672 are not put into the buffer for obvious reasons.
673 */
674 if (priv->cmd_ctrl) {
675 count = 0;
676 goto finish;
677 }
678
679 if (!count)
680 return count;
681
682 count = kfifo_in_locked(&priv->write_fifo, buf, count, &priv->lock);
683
684finish:
685 cypress_send(port);
686
687 return count;
688} /* cypress_write */
689
690
691static void cypress_send(struct usb_serial_port *port)
692{
693 int count = 0, result, offset, actual_size;
694 struct cypress_private *priv = usb_get_serial_port_data(port);
695 struct device *dev = &port->dev;
696 unsigned long flags;
697
698 if (!priv->comm_is_ok)
699 return;
700
701 dev_dbg(dev, "%s - interrupt out size is %d\n", __func__,
702 port->interrupt_out_size);
703
704 spin_lock_irqsave(&priv->lock, flags);
705 if (priv->write_urb_in_use) {
706 dev_dbg(dev, "%s - can't write, urb in use\n", __func__);
707 spin_unlock_irqrestore(&priv->lock, flags);
708 return;
709 }
710 spin_unlock_irqrestore(&priv->lock, flags);
711
712 /* clear buffer */
713 memset(port->interrupt_out_urb->transfer_buffer, 0,
714 port->interrupt_out_size);
715
716 spin_lock_irqsave(&priv->lock, flags);
717 switch (priv->pkt_fmt) {
718 default:
719 case packet_format_1:
720 /* this is for the CY7C64013... */
721 offset = 2;
722 port->interrupt_out_buffer[0] = priv->line_control;
723 break;
724 case packet_format_2:
725 /* this is for the CY7C63743... */
726 offset = 1;
727 port->interrupt_out_buffer[0] = priv->line_control;
728 break;
729 }
730
731 if (priv->line_control & CONTROL_RESET)
732 priv->line_control &= ~CONTROL_RESET;
733
734 if (priv->cmd_ctrl) {
735 priv->cmd_count++;
736 dev_dbg(dev, "%s - line control command being issued\n", __func__);
737 spin_unlock_irqrestore(&priv->lock, flags);
738 goto send;
739 } else
740 spin_unlock_irqrestore(&priv->lock, flags);
741
742 count = kfifo_out_locked(&priv->write_fifo,
743 &port->interrupt_out_buffer[offset],
744 port->interrupt_out_size - offset,
745 &priv->lock);
746 if (count == 0)
747 return;
748
749 switch (priv->pkt_fmt) {
750 default:
751 case packet_format_1:
752 port->interrupt_out_buffer[1] = count;
753 break;
754 case packet_format_2:
755 port->interrupt_out_buffer[0] |= count;
756 }
757
758 dev_dbg(dev, "%s - count is %d\n", __func__, count);
759
760send:
761 spin_lock_irqsave(&priv->lock, flags);
762 priv->write_urb_in_use = 1;
763 spin_unlock_irqrestore(&priv->lock, flags);
764
765 if (priv->cmd_ctrl)
766 actual_size = 1;
767 else
768 actual_size = count +
769 (priv->pkt_fmt == packet_format_1 ? 2 : 1);
770
771 usb_serial_debug_data(dev, __func__, port->interrupt_out_size,
772 port->interrupt_out_urb->transfer_buffer);
773
774 usb_fill_int_urb(port->interrupt_out_urb, port->serial->dev,
775 usb_sndintpipe(port->serial->dev, port->interrupt_out_endpointAddress),
776 port->interrupt_out_buffer, port->interrupt_out_size,
777 cypress_write_int_callback, port, priv->write_urb_interval);
778 result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC);
779 if (result) {
780 dev_err_console(port,
781 "%s - failed submitting write urb, error %d\n",
782 __func__, result);
783 priv->write_urb_in_use = 0;
784 cypress_set_dead(port);
785 }
786
787 spin_lock_irqsave(&priv->lock, flags);
788 if (priv->cmd_ctrl)
789 priv->cmd_ctrl = 0;
790
791 /* do not count the line control and size bytes */
792 priv->bytes_out += count;
793 spin_unlock_irqrestore(&priv->lock, flags);
794
795 usb_serial_port_softint(port);
796} /* cypress_send */
797
798
799/* returns how much space is available in the soft buffer */
800static int cypress_write_room(struct tty_struct *tty)
801{
802 struct usb_serial_port *port = tty->driver_data;
803 struct cypress_private *priv = usb_get_serial_port_data(port);
804 int room = 0;
805 unsigned long flags;
806
807 spin_lock_irqsave(&priv->lock, flags);
808 room = kfifo_avail(&priv->write_fifo);
809 spin_unlock_irqrestore(&priv->lock, flags);
810
811 dev_dbg(&port->dev, "%s - returns %d\n", __func__, room);
812 return room;
813}
814
815
816static int cypress_tiocmget(struct tty_struct *tty)
817{
818 struct usb_serial_port *port = tty->driver_data;
819 struct cypress_private *priv = usb_get_serial_port_data(port);
820 __u8 status, control;
821 unsigned int result = 0;
822 unsigned long flags;
823
824 spin_lock_irqsave(&priv->lock, flags);
825 control = priv->line_control;
826 status = priv->current_status;
827 spin_unlock_irqrestore(&priv->lock, flags);
828
829 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
830 | ((control & CONTROL_RTS) ? TIOCM_RTS : 0)
831 | ((status & UART_CTS) ? TIOCM_CTS : 0)
832 | ((status & UART_DSR) ? TIOCM_DSR : 0)
833 | ((status & UART_RI) ? TIOCM_RI : 0)
834 | ((status & UART_CD) ? TIOCM_CD : 0);
835
836 dev_dbg(&port->dev, "%s - result = %x\n", __func__, result);
837
838 return result;
839}
840
841
842static int cypress_tiocmset(struct tty_struct *tty,
843 unsigned int set, unsigned int clear)
844{
845 struct usb_serial_port *port = tty->driver_data;
846 struct cypress_private *priv = usb_get_serial_port_data(port);
847 unsigned long flags;
848
849 spin_lock_irqsave(&priv->lock, flags);
850 if (set & TIOCM_RTS)
851 priv->line_control |= CONTROL_RTS;
852 if (set & TIOCM_DTR)
853 priv->line_control |= CONTROL_DTR;
854 if (clear & TIOCM_RTS)
855 priv->line_control &= ~CONTROL_RTS;
856 if (clear & TIOCM_DTR)
857 priv->line_control &= ~CONTROL_DTR;
858 priv->cmd_ctrl = 1;
859 spin_unlock_irqrestore(&priv->lock, flags);
860
861 return cypress_write(tty, port, NULL, 0);
862}
863
864static void cypress_set_termios(struct tty_struct *tty,
865 struct usb_serial_port *port, struct ktermios *old_termios)
866{
867 struct cypress_private *priv = usb_get_serial_port_data(port);
868 struct device *dev = &port->dev;
869 int data_bits, stop_bits, parity_type, parity_enable;
870 unsigned cflag, iflag;
871 unsigned long flags;
872 __u8 oldlines;
873 int linechange = 0;
874
875 spin_lock_irqsave(&priv->lock, flags);
876 /* We can't clean this one up as we don't know the device type
877 early enough */
878 if (!priv->termios_initialized) {
879 if (priv->chiptype == CT_EARTHMATE) {
880 tty->termios = tty_std_termios;
881 tty->termios.c_cflag = B4800 | CS8 | CREAD | HUPCL |
882 CLOCAL;
883 tty->termios.c_ispeed = 4800;
884 tty->termios.c_ospeed = 4800;
885 } else if (priv->chiptype == CT_CYPHIDCOM) {
886 tty->termios = tty_std_termios;
887 tty->termios.c_cflag = B9600 | CS8 | CREAD | HUPCL |
888 CLOCAL;
889 tty->termios.c_ispeed = 9600;
890 tty->termios.c_ospeed = 9600;
891 } else if (priv->chiptype == CT_CA42V2) {
892 tty->termios = tty_std_termios;
893 tty->termios.c_cflag = B9600 | CS8 | CREAD | HUPCL |
894 CLOCAL;
895 tty->termios.c_ispeed = 9600;
896 tty->termios.c_ospeed = 9600;
897 }
898 priv->termios_initialized = 1;
899 }
900 spin_unlock_irqrestore(&priv->lock, flags);
901
902 /* Unsupported features need clearing */
903 tty->termios.c_cflag &= ~(CMSPAR|CRTSCTS);
904
905 cflag = tty->termios.c_cflag;
906 iflag = tty->termios.c_iflag;
907
908 /* check if there are new settings */
909 if (old_termios) {
910 spin_lock_irqsave(&priv->lock, flags);
911 priv->tmp_termios = tty->termios;
912 spin_unlock_irqrestore(&priv->lock, flags);
913 }
914
915 /* set number of data bits, parity, stop bits */
916 /* when parity is disabled the parity type bit is ignored */
917
918 /* 1 means 2 stop bits, 0 means 1 stop bit */
919 stop_bits = cflag & CSTOPB ? 1 : 0;
920
921 if (cflag & PARENB) {
922 parity_enable = 1;
923 /* 1 means odd parity, 0 means even parity */
924 parity_type = cflag & PARODD ? 1 : 0;
925 } else
926 parity_enable = parity_type = 0;
927
928 switch (cflag & CSIZE) {
929 case CS5:
930 data_bits = 0;
931 break;
932 case CS6:
933 data_bits = 1;
934 break;
935 case CS7:
936 data_bits = 2;
937 break;
938 case CS8:
939 data_bits = 3;
940 break;
941 default:
942 dev_err(dev, "%s - CSIZE was set, but not CS5-CS8\n", __func__);
943 data_bits = 3;
944 }
945 spin_lock_irqsave(&priv->lock, flags);
946 oldlines = priv->line_control;
947 if ((cflag & CBAUD) == B0) {
948 /* drop dtr and rts */
949 dev_dbg(dev, "%s - dropping the lines, baud rate 0bps\n", __func__);
950 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
951 } else
952 priv->line_control = (CONTROL_DTR | CONTROL_RTS);
953 spin_unlock_irqrestore(&priv->lock, flags);
954
955 dev_dbg(dev, "%s - sending %d stop_bits, %d parity_enable, %d parity_type, %d data_bits (+5)\n",
956 __func__, stop_bits, parity_enable, parity_type, data_bits);
957
958 cypress_serial_control(tty, port, tty_get_baud_rate(tty),
959 data_bits, stop_bits,
960 parity_enable, parity_type,
961 0, CYPRESS_SET_CONFIG);
962
963 /* we perform a CYPRESS_GET_CONFIG so that the current settings are
964 * filled into the private structure this should confirm that all is
965 * working if it returns what we just set */
966 cypress_serial_control(tty, port, 0, 0, 0, 0, 0, 0, CYPRESS_GET_CONFIG);
967
968 /* Here we can define custom tty settings for devices; the main tty
969 * termios flag base comes from empeg.c */
970
971 spin_lock_irqsave(&priv->lock, flags);
972 if (priv->chiptype == CT_EARTHMATE && priv->baud_rate == 4800) {
973 dev_dbg(dev, "Using custom termios settings for a baud rate of 4800bps.\n");
974 /* define custom termios settings for NMEA protocol */
975
976 tty->termios.c_iflag /* input modes - */
977 &= ~(IGNBRK /* disable ignore break */
978 | BRKINT /* disable break causes interrupt */
979 | PARMRK /* disable mark parity errors */
980 | ISTRIP /* disable clear high bit of input char */
981 | INLCR /* disable translate NL to CR */
982 | IGNCR /* disable ignore CR */
983 | ICRNL /* disable translate CR to NL */
984 | IXON); /* disable enable XON/XOFF flow control */
985
986 tty->termios.c_oflag /* output modes */
987 &= ~OPOST; /* disable postprocess output char */
988
989 tty->termios.c_lflag /* line discipline modes */
990 &= ~(ECHO /* disable echo input characters */
991 | ECHONL /* disable echo new line */
992 | ICANON /* disable erase, kill, werase, and rprnt
993 special characters */
994 | ISIG /* disable interrupt, quit, and suspend
995 special characters */
996 | IEXTEN); /* disable non-POSIX special characters */
997 } /* CT_CYPHIDCOM: Application should handle this for device */
998
999 linechange = (priv->line_control != oldlines);
1000 spin_unlock_irqrestore(&priv->lock, flags);
1001
1002 /* if necessary, set lines */
1003 if (linechange) {
1004 priv->cmd_ctrl = 1;
1005 cypress_write(tty, port, NULL, 0);
1006 }
1007} /* cypress_set_termios */
1008
1009
1010/* returns amount of data still left in soft buffer */
1011static int cypress_chars_in_buffer(struct tty_struct *tty)
1012{
1013 struct usb_serial_port *port = tty->driver_data;
1014 struct cypress_private *priv = usb_get_serial_port_data(port);
1015 int chars = 0;
1016 unsigned long flags;
1017
1018 spin_lock_irqsave(&priv->lock, flags);
1019 chars = kfifo_len(&priv->write_fifo);
1020 spin_unlock_irqrestore(&priv->lock, flags);
1021
1022 dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
1023 return chars;
1024}
1025
1026
1027static void cypress_throttle(struct tty_struct *tty)
1028{
1029 struct usb_serial_port *port = tty->driver_data;
1030 struct cypress_private *priv = usb_get_serial_port_data(port);
1031
1032 spin_lock_irq(&priv->lock);
1033 priv->rx_flags = THROTTLED;
1034 spin_unlock_irq(&priv->lock);
1035}
1036
1037
1038static void cypress_unthrottle(struct tty_struct *tty)
1039{
1040 struct usb_serial_port *port = tty->driver_data;
1041 struct cypress_private *priv = usb_get_serial_port_data(port);
1042 int actually_throttled, result;
1043
1044 spin_lock_irq(&priv->lock);
1045 actually_throttled = priv->rx_flags & ACTUALLY_THROTTLED;
1046 priv->rx_flags = 0;
1047 spin_unlock_irq(&priv->lock);
1048
1049 if (!priv->comm_is_ok)
1050 return;
1051
1052 if (actually_throttled) {
1053 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
1054 if (result) {
1055 dev_err(&port->dev, "%s - failed submitting read urb, "
1056 "error %d\n", __func__, result);
1057 cypress_set_dead(port);
1058 }
1059 }
1060}
1061
1062
1063static void cypress_read_int_callback(struct urb *urb)
1064{
1065 struct usb_serial_port *port = urb->context;
1066 struct cypress_private *priv = usb_get_serial_port_data(port);
1067 struct device *dev = &urb->dev->dev;
1068 struct tty_struct *tty;
1069 unsigned char *data = urb->transfer_buffer;
1070 unsigned long flags;
1071 char tty_flag = TTY_NORMAL;
1072 int havedata = 0;
1073 int bytes = 0;
1074 int result;
1075 int i = 0;
1076 int status = urb->status;
1077
1078 switch (status) {
1079 case 0: /* success */
1080 break;
1081 case -ECONNRESET:
1082 case -ENOENT:
1083 case -ESHUTDOWN:
1084 /* precursor to disconnect so just go away */
1085 return;
1086 case -EPIPE:
1087 /* Can't call usb_clear_halt while in_interrupt */
1088 /* FALLS THROUGH */
1089 default:
1090 /* something ugly is going on... */
1091 dev_err(dev, "%s - unexpected nonzero read status received: %d\n",
1092 __func__, status);
1093 cypress_set_dead(port);
1094 return;
1095 }
1096
1097 spin_lock_irqsave(&priv->lock, flags);
1098 if (priv->rx_flags & THROTTLED) {
1099 dev_dbg(dev, "%s - now throttling\n", __func__);
1100 priv->rx_flags |= ACTUALLY_THROTTLED;
1101 spin_unlock_irqrestore(&priv->lock, flags);
1102 return;
1103 }
1104 spin_unlock_irqrestore(&priv->lock, flags);
1105
1106 tty = tty_port_tty_get(&port->port);
1107 if (!tty) {
1108 dev_dbg(dev, "%s - bad tty pointer - exiting\n", __func__);
1109 return;
1110 }
1111
1112 spin_lock_irqsave(&priv->lock, flags);
1113 result = urb->actual_length;
1114 switch (priv->pkt_fmt) {
1115 default:
1116 case packet_format_1:
1117 /* This is for the CY7C64013... */
1118 priv->current_status = data[0] & 0xF8;
1119 bytes = data[1] + 2;
1120 i = 2;
1121 if (bytes > 2)
1122 havedata = 1;
1123 break;
1124 case packet_format_2:
1125 /* This is for the CY7C63743... */
1126 priv->current_status = data[0] & 0xF8;
1127 bytes = (data[0] & 0x07) + 1;
1128 i = 1;
1129 if (bytes > 1)
1130 havedata = 1;
1131 break;
1132 }
1133 spin_unlock_irqrestore(&priv->lock, flags);
1134 if (result < bytes) {
1135 dev_dbg(dev,
1136 "%s - wrong packet size - received %d bytes but packet said %d bytes\n",
1137 __func__, result, bytes);
1138 goto continue_read;
1139 }
1140
1141 usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
1142
1143 spin_lock_irqsave(&priv->lock, flags);
1144 /* check to see if status has changed */
1145 if (priv->current_status != priv->prev_status) {
1146 u8 delta = priv->current_status ^ priv->prev_status;
1147
1148 if (delta & UART_MSR_MASK) {
1149 if (delta & UART_CTS)
1150 port->icount.cts++;
1151 if (delta & UART_DSR)
1152 port->icount.dsr++;
1153 if (delta & UART_RI)
1154 port->icount.rng++;
1155 if (delta & UART_CD)
1156 port->icount.dcd++;
1157
1158 wake_up_interruptible(&port->port.delta_msr_wait);
1159 }
1160
1161 priv->prev_status = priv->current_status;
1162 }
1163 spin_unlock_irqrestore(&priv->lock, flags);
1164
1165 /* hangup, as defined in acm.c... this might be a bad place for it
1166 * though */
1167 if (tty && !C_CLOCAL(tty) && !(priv->current_status & UART_CD)) {
1168 dev_dbg(dev, "%s - calling hangup\n", __func__);
1169 tty_hangup(tty);
1170 goto continue_read;
1171 }
1172
1173 /* There is one error bit... I'm assuming it is a parity error
1174 * indicator as the generic firmware will set this bit to 1 if a
1175 * parity error occurs.
1176 * I can not find reference to any other error events. */
1177 spin_lock_irqsave(&priv->lock, flags);
1178 if (priv->current_status & CYP_ERROR) {
1179 spin_unlock_irqrestore(&priv->lock, flags);
1180 tty_flag = TTY_PARITY;
1181 dev_dbg(dev, "%s - Parity Error detected\n", __func__);
1182 } else
1183 spin_unlock_irqrestore(&priv->lock, flags);
1184
1185 /* process read if there is data other than line status */
1186 if (bytes > i) {
1187 tty_insert_flip_string_fixed_flag(&port->port, data + i,
1188 tty_flag, bytes - i);
1189 tty_flip_buffer_push(&port->port);
1190 }
1191
1192 spin_lock_irqsave(&priv->lock, flags);
1193 /* control and status byte(s) are also counted */
1194 priv->bytes_in += bytes;
1195 spin_unlock_irqrestore(&priv->lock, flags);
1196
1197continue_read:
1198 tty_kref_put(tty);
1199
1200 /* Continue trying to always read */
1201
1202 if (priv->comm_is_ok) {
1203 usb_fill_int_urb(port->interrupt_in_urb, port->serial->dev,
1204 usb_rcvintpipe(port->serial->dev,
1205 port->interrupt_in_endpointAddress),
1206 port->interrupt_in_urb->transfer_buffer,
1207 port->interrupt_in_urb->transfer_buffer_length,
1208 cypress_read_int_callback, port,
1209 priv->read_urb_interval);
1210 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
1211 if (result && result != -EPERM) {
1212 dev_err(dev, "%s - failed resubmitting read urb, error %d\n",
1213 __func__, result);
1214 cypress_set_dead(port);
1215 }
1216 }
1217} /* cypress_read_int_callback */
1218
1219
1220static void cypress_write_int_callback(struct urb *urb)
1221{
1222 struct usb_serial_port *port = urb->context;
1223 struct cypress_private *priv = usb_get_serial_port_data(port);
1224 struct device *dev = &urb->dev->dev;
1225 int status = urb->status;
1226
1227 switch (status) {
1228 case 0:
1229 /* success */
1230 break;
1231 case -ECONNRESET:
1232 case -ENOENT:
1233 case -ESHUTDOWN:
1234 /* this urb is terminated, clean up */
1235 dev_dbg(dev, "%s - urb shutting down with status: %d\n",
1236 __func__, status);
1237 priv->write_urb_in_use = 0;
1238 return;
1239 case -EPIPE:
1240 /* Cannot call usb_clear_halt while in_interrupt */
1241 /* FALLTHROUGH */
1242 default:
1243 dev_err(dev, "%s - unexpected nonzero write status received: %d\n",
1244 __func__, status);
1245 cypress_set_dead(port);
1246 break;
1247 }
1248 priv->write_urb_in_use = 0;
1249
1250 /* send any buffered data */
1251 cypress_send(port);
1252}
1253
1254module_usb_serial_driver(serial_drivers, id_table_combined);
1255
1256MODULE_AUTHOR(DRIVER_AUTHOR);
1257MODULE_DESCRIPTION(DRIVER_DESC);
1258MODULE_LICENSE("GPL");
1259
1260module_param(stats, bool, S_IRUGO | S_IWUSR);
1261MODULE_PARM_DESC(stats, "Enable statistics or not");
1262module_param(interval, int, S_IRUGO | S_IWUSR);
1263MODULE_PARM_DESC(interval, "Overrides interrupt interval");
1264module_param(unstable_bauds, bool, S_IRUGO | S_IWUSR);
1265MODULE_PARM_DESC(unstable_bauds, "Allow unstable baud rates");