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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// SPDX-License-Identifier: GPL-2.0+
2/*
3 * USB Cypress M8 driver
4 *
5 * Copyright (C) 2004
6 * Lonnie Mendez (dignome@gmail.com)
7 * Copyright (C) 2003,2004
8 * Neil Whelchel (koyama@firstlight.net)
9 *
10 * See Documentation/usb/usb-serial.rst for more information on using this
11 * driver
12 *
13 * See http://geocities.com/i0xox0i for information on this driver and the
14 * earthmate usb device.
15 */
16
17/* Thanks to Neil Whelchel for writing the first cypress m8 implementation
18 for linux. */
19/* Thanks to cypress for providing references for the hid reports. */
20/* Thanks to Jiang Zhang for providing links and for general help. */
21/* Code originates and was built up from ftdi_sio, belkin, pl2303 and others.*/
22
23
24#include <linux/kernel.h>
25#include <linux/errno.h>
26#include <linux/slab.h>
27#include <linux/tty.h>
28#include <linux/tty_driver.h>
29#include <linux/tty_flip.h>
30#include <linux/module.h>
31#include <linux/moduleparam.h>
32#include <linux/spinlock.h>
33#include <linux/usb.h>
34#include <linux/usb/serial.h>
35#include <linux/serial.h>
36#include <linux/kfifo.h>
37#include <linux/delay.h>
38#include <linux/uaccess.h>
39#include <asm/unaligned.h>
40
41#include "cypress_m8.h"
42
43
44static bool stats;
45static int interval;
46static bool unstable_bauds;
47
48#define DRIVER_AUTHOR "Lonnie Mendez <dignome@gmail.com>, Neil Whelchel <koyama@firstlight.net>"
49#define DRIVER_DESC "Cypress USB to Serial Driver"
50
51/* write buffer size defines */
52#define CYPRESS_BUF_SIZE 1024
53
54static const struct usb_device_id id_table_earthmate[] = {
55 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
56 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
57 { } /* Terminating entry */
58};
59
60static const struct usb_device_id id_table_cyphidcomrs232[] = {
61 { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
62 { USB_DEVICE(VENDOR_ID_SAI, PRODUCT_ID_CYPHIDCOM) },
63 { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) },
64 { USB_DEVICE(VENDOR_ID_FRWD, PRODUCT_ID_CYPHIDCOM_FRWD) },
65 { } /* Terminating entry */
66};
67
68static const struct usb_device_id id_table_nokiaca42v2[] = {
69 { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
70 { } /* Terminating entry */
71};
72
73static const struct usb_device_id id_table_combined[] = {
74 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
75 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
76 { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
77 { USB_DEVICE(VENDOR_ID_SAI, PRODUCT_ID_CYPHIDCOM) },
78 { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) },
79 { USB_DEVICE(VENDOR_ID_FRWD, PRODUCT_ID_CYPHIDCOM_FRWD) },
80 { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
81 { } /* Terminating entry */
82};
83
84MODULE_DEVICE_TABLE(usb, id_table_combined);
85
86enum packet_format {
87 packet_format_1, /* b0:status, b1:payload count */
88 packet_format_2 /* b0[7:3]:status, b0[2:0]:payload count */
89};
90
91struct cypress_private {
92 spinlock_t lock; /* private lock */
93 int chiptype; /* identifier of device, for quirks/etc */
94 int bytes_in; /* used for statistics */
95 int bytes_out; /* used for statistics */
96 int cmd_count; /* used for statistics */
97 int cmd_ctrl; /* always set this to 1 before issuing a command */
98 struct kfifo write_fifo; /* write fifo */
99 int write_urb_in_use; /* write urb in use indicator */
100 int write_urb_interval; /* interval to use for write urb */
101 int read_urb_interval; /* interval to use for read urb */
102 int comm_is_ok; /* true if communication is (still) ok */
103 __u8 line_control; /* holds dtr / rts value */
104 __u8 current_status; /* received from last read - info on dsr,cts,cd,ri,etc */
105 __u8 current_config; /* stores the current configuration byte */
106 __u8 rx_flags; /* throttling - used from whiteheat/ftdi_sio */
107 enum packet_format pkt_fmt; /* format to use for packet send / receive */
108 int get_cfg_unsafe; /* If true, the CYPRESS_GET_CONFIG is unsafe */
109 int baud_rate; /* stores current baud rate in
110 integer form */
111 char prev_status; /* used for TIOCMIWAIT */
112};
113
114/* function prototypes for the Cypress USB to serial device */
115static int cypress_earthmate_port_probe(struct usb_serial_port *port);
116static int cypress_hidcom_port_probe(struct usb_serial_port *port);
117static int cypress_ca42v2_port_probe(struct usb_serial_port *port);
118static int cypress_port_remove(struct usb_serial_port *port);
119static int cypress_open(struct tty_struct *tty, struct usb_serial_port *port);
120static void cypress_close(struct usb_serial_port *port);
121static void cypress_dtr_rts(struct usb_serial_port *port, int on);
122static int cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
123 const unsigned char *buf, int count);
124static void cypress_send(struct usb_serial_port *port);
125static int cypress_write_room(struct tty_struct *tty);
126static void cypress_earthmate_init_termios(struct tty_struct *tty);
127static void cypress_set_termios(struct tty_struct *tty,
128 struct usb_serial_port *port, struct ktermios *old);
129static int cypress_tiocmget(struct tty_struct *tty);
130static int cypress_tiocmset(struct tty_struct *tty,
131 unsigned int set, unsigned int clear);
132static int cypress_chars_in_buffer(struct tty_struct *tty);
133static void cypress_throttle(struct tty_struct *tty);
134static void cypress_unthrottle(struct tty_struct *tty);
135static void cypress_set_dead(struct usb_serial_port *port);
136static void cypress_read_int_callback(struct urb *urb);
137static void cypress_write_int_callback(struct urb *urb);
138
139static struct usb_serial_driver cypress_earthmate_device = {
140 .driver = {
141 .owner = THIS_MODULE,
142 .name = "earthmate",
143 },
144 .description = "DeLorme Earthmate USB",
145 .id_table = id_table_earthmate,
146 .num_ports = 1,
147 .port_probe = cypress_earthmate_port_probe,
148 .port_remove = cypress_port_remove,
149 .open = cypress_open,
150 .close = cypress_close,
151 .dtr_rts = cypress_dtr_rts,
152 .write = cypress_write,
153 .write_room = cypress_write_room,
154 .init_termios = cypress_earthmate_init_termios,
155 .set_termios = cypress_set_termios,
156 .tiocmget = cypress_tiocmget,
157 .tiocmset = cypress_tiocmset,
158 .tiocmiwait = usb_serial_generic_tiocmiwait,
159 .chars_in_buffer = cypress_chars_in_buffer,
160 .throttle = cypress_throttle,
161 .unthrottle = cypress_unthrottle,
162 .read_int_callback = cypress_read_int_callback,
163 .write_int_callback = cypress_write_int_callback,
164};
165
166static struct usb_serial_driver cypress_hidcom_device = {
167 .driver = {
168 .owner = THIS_MODULE,
169 .name = "cyphidcom",
170 },
171 .description = "HID->COM RS232 Adapter",
172 .id_table = id_table_cyphidcomrs232,
173 .num_ports = 1,
174 .port_probe = cypress_hidcom_port_probe,
175 .port_remove = cypress_port_remove,
176 .open = cypress_open,
177 .close = cypress_close,
178 .dtr_rts = cypress_dtr_rts,
179 .write = cypress_write,
180 .write_room = cypress_write_room,
181 .set_termios = cypress_set_termios,
182 .tiocmget = cypress_tiocmget,
183 .tiocmset = cypress_tiocmset,
184 .tiocmiwait = usb_serial_generic_tiocmiwait,
185 .chars_in_buffer = cypress_chars_in_buffer,
186 .throttle = cypress_throttle,
187 .unthrottle = cypress_unthrottle,
188 .read_int_callback = cypress_read_int_callback,
189 .write_int_callback = cypress_write_int_callback,
190};
191
192static struct usb_serial_driver cypress_ca42v2_device = {
193 .driver = {
194 .owner = THIS_MODULE,
195 .name = "nokiaca42v2",
196 },
197 .description = "Nokia CA-42 V2 Adapter",
198 .id_table = id_table_nokiaca42v2,
199 .num_ports = 1,
200 .port_probe = cypress_ca42v2_port_probe,
201 .port_remove = cypress_port_remove,
202 .open = cypress_open,
203 .close = cypress_close,
204 .dtr_rts = cypress_dtr_rts,
205 .write = cypress_write,
206 .write_room = cypress_write_room,
207 .set_termios = cypress_set_termios,
208 .tiocmget = cypress_tiocmget,
209 .tiocmset = cypress_tiocmset,
210 .tiocmiwait = usb_serial_generic_tiocmiwait,
211 .chars_in_buffer = cypress_chars_in_buffer,
212 .throttle = cypress_throttle,
213 .unthrottle = cypress_unthrottle,
214 .read_int_callback = cypress_read_int_callback,
215 .write_int_callback = cypress_write_int_callback,
216};
217
218static struct usb_serial_driver * const serial_drivers[] = {
219 &cypress_earthmate_device, &cypress_hidcom_device,
220 &cypress_ca42v2_device, NULL
221};
222
223/*****************************************************************************
224 * Cypress serial helper functions
225 *****************************************************************************/
226
227/* FRWD Dongle hidcom needs to skip reset and speed checks */
228static inline bool is_frwd(struct usb_device *dev)
229{
230 return ((le16_to_cpu(dev->descriptor.idVendor) == VENDOR_ID_FRWD) &&
231 (le16_to_cpu(dev->descriptor.idProduct) == PRODUCT_ID_CYPHIDCOM_FRWD));
232}
233
234static int analyze_baud_rate(struct usb_serial_port *port, speed_t new_rate)
235{
236 struct cypress_private *priv;
237 priv = usb_get_serial_port_data(port);
238
239 if (unstable_bauds)
240 return new_rate;
241
242 /* FRWD Dongle uses 115200 bps */
243 if (is_frwd(port->serial->dev))
244 return new_rate;
245
246 /*
247 * The general purpose firmware for the Cypress M8 allows for
248 * a maximum speed of 57600bps (I have no idea whether DeLorme
249 * chose to use the general purpose firmware or not), if you
250 * need to modify this speed setting for your own project
251 * please add your own chiptype and modify the code likewise.
252 * The Cypress HID->COM device will work successfully up to
253 * 115200bps (but the actual throughput is around 3kBps).
254 */
255 if (port->serial->dev->speed == USB_SPEED_LOW) {
256 /*
257 * Mike Isely <isely@pobox.com> 2-Feb-2008: The
258 * Cypress app note that describes this mechanism
259 * states the the low-speed part can't handle more
260 * than 800 bytes/sec, in which case 4800 baud is the
261 * safest speed for a part like that.
262 */
263 if (new_rate > 4800) {
264 dev_dbg(&port->dev,
265 "%s - failed setting baud rate, device incapable speed %d\n",
266 __func__, new_rate);
267 return -1;
268 }
269 }
270 switch (priv->chiptype) {
271 case CT_EARTHMATE:
272 if (new_rate <= 600) {
273 /* 300 and 600 baud rates are supported under
274 * the generic firmware, but are not used with
275 * NMEA and SiRF protocols */
276 dev_dbg(&port->dev,
277 "%s - failed setting baud rate, unsupported speed of %d on Earthmate GPS\n",
278 __func__, new_rate);
279 return -1;
280 }
281 break;
282 default:
283 break;
284 }
285 return new_rate;
286}
287
288
289/* This function can either set or retrieve the current serial line settings */
290static int cypress_serial_control(struct tty_struct *tty,
291 struct usb_serial_port *port, speed_t baud_rate, int data_bits,
292 int stop_bits, int parity_enable, int parity_type, int reset,
293 int cypress_request_type)
294{
295 int new_baudrate = 0, retval = 0, tries = 0;
296 struct cypress_private *priv;
297 struct device *dev = &port->dev;
298 u8 *feature_buffer;
299 const unsigned int feature_len = 5;
300 unsigned long flags;
301
302 priv = usb_get_serial_port_data(port);
303
304 if (!priv->comm_is_ok)
305 return -ENODEV;
306
307 feature_buffer = kcalloc(feature_len, sizeof(u8), GFP_KERNEL);
308 if (!feature_buffer)
309 return -ENOMEM;
310
311 switch (cypress_request_type) {
312 case CYPRESS_SET_CONFIG:
313 /* 0 means 'Hang up' so doesn't change the true bit rate */
314 new_baudrate = priv->baud_rate;
315 if (baud_rate && baud_rate != priv->baud_rate) {
316 dev_dbg(dev, "%s - baud rate is changing\n", __func__);
317 retval = analyze_baud_rate(port, baud_rate);
318 if (retval >= 0) {
319 new_baudrate = retval;
320 dev_dbg(dev, "%s - New baud rate set to %d\n",
321 __func__, new_baudrate);
322 }
323 }
324 dev_dbg(dev, "%s - baud rate is being sent as %d\n", __func__,
325 new_baudrate);
326
327 /* fill the feature_buffer with new configuration */
328 put_unaligned_le32(new_baudrate, feature_buffer);
329 feature_buffer[4] |= data_bits; /* assign data bits in 2 bit space ( max 3 ) */
330 /* 1 bit gap */
331 feature_buffer[4] |= (stop_bits << 3); /* assign stop bits in 1 bit space */
332 feature_buffer[4] |= (parity_enable << 4); /* assign parity flag in 1 bit space */
333 feature_buffer[4] |= (parity_type << 5); /* assign parity type in 1 bit space */
334 /* 1 bit gap */
335 feature_buffer[4] |= (reset << 7); /* assign reset at end of byte, 1 bit space */
336
337 dev_dbg(dev, "%s - device is being sent this feature report:\n", __func__);
338 dev_dbg(dev, "%s - %02X - %02X - %02X - %02X - %02X\n", __func__,
339 feature_buffer[0], feature_buffer[1],
340 feature_buffer[2], feature_buffer[3],
341 feature_buffer[4]);
342
343 do {
344 retval = usb_control_msg(port->serial->dev,
345 usb_sndctrlpipe(port->serial->dev, 0),
346 HID_REQ_SET_REPORT,
347 USB_DIR_OUT | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
348 0x0300, 0, feature_buffer,
349 feature_len, 500);
350
351 if (tries++ >= 3)
352 break;
353
354 } while (retval != feature_len &&
355 retval != -ENODEV);
356
357 if (retval != feature_len) {
358 dev_err(dev, "%s - failed sending serial line settings - %d\n",
359 __func__, retval);
360 cypress_set_dead(port);
361 } else {
362 spin_lock_irqsave(&priv->lock, flags);
363 priv->baud_rate = new_baudrate;
364 priv->current_config = feature_buffer[4];
365 spin_unlock_irqrestore(&priv->lock, flags);
366 /* If we asked for a speed change encode it */
367 if (baud_rate)
368 tty_encode_baud_rate(tty,
369 new_baudrate, new_baudrate);
370 }
371 break;
372 case CYPRESS_GET_CONFIG:
373 if (priv->get_cfg_unsafe) {
374 /* Not implemented for this device,
375 and if we try to do it we're likely
376 to crash the hardware. */
377 retval = -ENOTTY;
378 goto out;
379 }
380 dev_dbg(dev, "%s - retrieving serial line settings\n", __func__);
381 do {
382 retval = usb_control_msg(port->serial->dev,
383 usb_rcvctrlpipe(port->serial->dev, 0),
384 HID_REQ_GET_REPORT,
385 USB_DIR_IN | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
386 0x0300, 0, feature_buffer,
387 feature_len, 500);
388
389 if (tries++ >= 3)
390 break;
391 } while (retval != feature_len
392 && retval != -ENODEV);
393
394 if (retval != feature_len) {
395 dev_err(dev, "%s - failed to retrieve serial line settings - %d\n",
396 __func__, retval);
397 cypress_set_dead(port);
398 goto out;
399 } else {
400 spin_lock_irqsave(&priv->lock, flags);
401 /* store the config in one byte, and later
402 use bit masks to check values */
403 priv->current_config = feature_buffer[4];
404 priv->baud_rate = get_unaligned_le32(feature_buffer);
405 spin_unlock_irqrestore(&priv->lock, flags);
406 }
407 }
408 spin_lock_irqsave(&priv->lock, flags);
409 ++priv->cmd_count;
410 spin_unlock_irqrestore(&priv->lock, flags);
411out:
412 kfree(feature_buffer);
413 return retval;
414} /* cypress_serial_control */
415
416
417static void cypress_set_dead(struct usb_serial_port *port)
418{
419 struct cypress_private *priv = usb_get_serial_port_data(port);
420 unsigned long flags;
421
422 spin_lock_irqsave(&priv->lock, flags);
423 if (!priv->comm_is_ok) {
424 spin_unlock_irqrestore(&priv->lock, flags);
425 return;
426 }
427 priv->comm_is_ok = 0;
428 spin_unlock_irqrestore(&priv->lock, flags);
429
430 dev_err(&port->dev, "cypress_m8 suspending failing port %d - "
431 "interval might be too short\n", port->port_number);
432}
433
434
435/*****************************************************************************
436 * Cypress serial driver functions
437 *****************************************************************************/
438
439
440static int cypress_generic_port_probe(struct usb_serial_port *port)
441{
442 struct usb_serial *serial = port->serial;
443 struct cypress_private *priv;
444
445 if (!port->interrupt_out_urb || !port->interrupt_in_urb) {
446 dev_err(&port->dev, "required endpoint is missing\n");
447 return -ENODEV;
448 }
449
450 priv = kzalloc(sizeof(struct cypress_private), GFP_KERNEL);
451 if (!priv)
452 return -ENOMEM;
453
454 priv->comm_is_ok = !0;
455 spin_lock_init(&priv->lock);
456 if (kfifo_alloc(&priv->write_fifo, CYPRESS_BUF_SIZE, GFP_KERNEL)) {
457 kfree(priv);
458 return -ENOMEM;
459 }
460
461 /* Skip reset for FRWD device. It is a workaound:
462 device hangs if it receives SET_CONFIGURE in Configured
463 state. */
464 if (!is_frwd(serial->dev))
465 usb_reset_configuration(serial->dev);
466
467 priv->cmd_ctrl = 0;
468 priv->line_control = 0;
469 priv->rx_flags = 0;
470 /* Default packet format setting is determined by packet size.
471 Anything with a size larger then 9 must have a separate
472 count field since the 3 bit count field is otherwise too
473 small. Otherwise we can use the slightly more compact
474 format. This is in accordance with the cypress_m8 serial
475 converter app note. */
476 if (port->interrupt_out_size > 9)
477 priv->pkt_fmt = packet_format_1;
478 else
479 priv->pkt_fmt = packet_format_2;
480
481 if (interval > 0) {
482 priv->write_urb_interval = interval;
483 priv->read_urb_interval = interval;
484 dev_dbg(&port->dev, "%s - read & write intervals forced to %d\n",
485 __func__, interval);
486 } else {
487 priv->write_urb_interval = port->interrupt_out_urb->interval;
488 priv->read_urb_interval = port->interrupt_in_urb->interval;
489 dev_dbg(&port->dev, "%s - intervals: read=%d write=%d\n",
490 __func__, priv->read_urb_interval,
491 priv->write_urb_interval);
492 }
493 usb_set_serial_port_data(port, priv);
494
495 port->port.drain_delay = 256;
496
497 return 0;
498}
499
500
501static int cypress_earthmate_port_probe(struct usb_serial_port *port)
502{
503 struct usb_serial *serial = port->serial;
504 struct cypress_private *priv;
505 int ret;
506
507 ret = cypress_generic_port_probe(port);
508 if (ret) {
509 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
510 return ret;
511 }
512
513 priv = usb_get_serial_port_data(port);
514 priv->chiptype = CT_EARTHMATE;
515 /* All Earthmate devices use the separated-count packet
516 format! Idiotic. */
517 priv->pkt_fmt = packet_format_1;
518 if (serial->dev->descriptor.idProduct !=
519 cpu_to_le16(PRODUCT_ID_EARTHMATEUSB)) {
520 /* The old original USB Earthmate seemed able to
521 handle GET_CONFIG requests; everything they've
522 produced since that time crashes if this command is
523 attempted :-( */
524 dev_dbg(&port->dev,
525 "%s - Marking this device as unsafe for GET_CONFIG commands\n",
526 __func__);
527 priv->get_cfg_unsafe = !0;
528 }
529
530 return 0;
531}
532
533static int cypress_hidcom_port_probe(struct usb_serial_port *port)
534{
535 struct cypress_private *priv;
536 int ret;
537
538 ret = cypress_generic_port_probe(port);
539 if (ret) {
540 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
541 return ret;
542 }
543
544 priv = usb_get_serial_port_data(port);
545 priv->chiptype = CT_CYPHIDCOM;
546
547 return 0;
548}
549
550static int cypress_ca42v2_port_probe(struct usb_serial_port *port)
551{
552 struct cypress_private *priv;
553 int ret;
554
555 ret = cypress_generic_port_probe(port);
556 if (ret) {
557 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
558 return ret;
559 }
560
561 priv = usb_get_serial_port_data(port);
562 priv->chiptype = CT_CA42V2;
563
564 return 0;
565}
566
567static int cypress_port_remove(struct usb_serial_port *port)
568{
569 struct cypress_private *priv;
570
571 priv = usb_get_serial_port_data(port);
572
573 kfifo_free(&priv->write_fifo);
574 kfree(priv);
575
576 return 0;
577}
578
579static int cypress_open(struct tty_struct *tty, struct usb_serial_port *port)
580{
581 struct cypress_private *priv = usb_get_serial_port_data(port);
582 struct usb_serial *serial = port->serial;
583 unsigned long flags;
584 int result = 0;
585
586 if (!priv->comm_is_ok)
587 return -EIO;
588
589 /* clear halts before open */
590 usb_clear_halt(serial->dev, 0x81);
591 usb_clear_halt(serial->dev, 0x02);
592
593 spin_lock_irqsave(&priv->lock, flags);
594 /* reset read/write statistics */
595 priv->bytes_in = 0;
596 priv->bytes_out = 0;
597 priv->cmd_count = 0;
598 priv->rx_flags = 0;
599 spin_unlock_irqrestore(&priv->lock, flags);
600
601 /* Set termios */
602 cypress_send(port);
603
604 if (tty)
605 cypress_set_termios(tty, port, NULL);
606
607 /* setup the port and start reading from the device */
608 usb_fill_int_urb(port->interrupt_in_urb, serial->dev,
609 usb_rcvintpipe(serial->dev, port->interrupt_in_endpointAddress),
610 port->interrupt_in_urb->transfer_buffer,
611 port->interrupt_in_urb->transfer_buffer_length,
612 cypress_read_int_callback, port, priv->read_urb_interval);
613 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
614
615 if (result) {
616 dev_err(&port->dev,
617 "%s - failed submitting read urb, error %d\n",
618 __func__, result);
619 cypress_set_dead(port);
620 }
621
622 return result;
623} /* cypress_open */
624
625static void cypress_dtr_rts(struct usb_serial_port *port, int on)
626{
627 struct cypress_private *priv = usb_get_serial_port_data(port);
628 /* drop dtr and rts */
629 spin_lock_irq(&priv->lock);
630 if (on == 0)
631 priv->line_control = 0;
632 else
633 priv->line_control = CONTROL_DTR | CONTROL_RTS;
634 priv->cmd_ctrl = 1;
635 spin_unlock_irq(&priv->lock);
636 cypress_write(NULL, port, NULL, 0);
637}
638
639static void cypress_close(struct usb_serial_port *port)
640{
641 struct cypress_private *priv = usb_get_serial_port_data(port);
642 unsigned long flags;
643
644 spin_lock_irqsave(&priv->lock, flags);
645 kfifo_reset_out(&priv->write_fifo);
646 spin_unlock_irqrestore(&priv->lock, flags);
647
648 dev_dbg(&port->dev, "%s - stopping urbs\n", __func__);
649 usb_kill_urb(port->interrupt_in_urb);
650 usb_kill_urb(port->interrupt_out_urb);
651
652 if (stats)
653 dev_info(&port->dev, "Statistics: %d Bytes In | %d Bytes Out | %d Commands Issued\n",
654 priv->bytes_in, priv->bytes_out, priv->cmd_count);
655} /* cypress_close */
656
657
658static int cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
659 const unsigned char *buf, int count)
660{
661 struct cypress_private *priv = usb_get_serial_port_data(port);
662
663 dev_dbg(&port->dev, "%s - %d bytes\n", __func__, count);
664
665 /* line control commands, which need to be executed immediately,
666 are not put into the buffer for obvious reasons.
667 */
668 if (priv->cmd_ctrl) {
669 count = 0;
670 goto finish;
671 }
672
673 if (!count)
674 return count;
675
676 count = kfifo_in_locked(&priv->write_fifo, buf, count, &priv->lock);
677
678finish:
679 cypress_send(port);
680
681 return count;
682} /* cypress_write */
683
684
685static void cypress_send(struct usb_serial_port *port)
686{
687 int count = 0, result, offset, actual_size;
688 struct cypress_private *priv = usb_get_serial_port_data(port);
689 struct device *dev = &port->dev;
690 unsigned long flags;
691
692 if (!priv->comm_is_ok)
693 return;
694
695 dev_dbg(dev, "%s - interrupt out size is %d\n", __func__,
696 port->interrupt_out_size);
697
698 spin_lock_irqsave(&priv->lock, flags);
699 if (priv->write_urb_in_use) {
700 dev_dbg(dev, "%s - can't write, urb in use\n", __func__);
701 spin_unlock_irqrestore(&priv->lock, flags);
702 return;
703 }
704 spin_unlock_irqrestore(&priv->lock, flags);
705
706 /* clear buffer */
707 memset(port->interrupt_out_urb->transfer_buffer, 0,
708 port->interrupt_out_size);
709
710 spin_lock_irqsave(&priv->lock, flags);
711 switch (priv->pkt_fmt) {
712 default:
713 case packet_format_1:
714 /* this is for the CY7C64013... */
715 offset = 2;
716 port->interrupt_out_buffer[0] = priv->line_control;
717 break;
718 case packet_format_2:
719 /* this is for the CY7C63743... */
720 offset = 1;
721 port->interrupt_out_buffer[0] = priv->line_control;
722 break;
723 }
724
725 if (priv->line_control & CONTROL_RESET)
726 priv->line_control &= ~CONTROL_RESET;
727
728 if (priv->cmd_ctrl) {
729 priv->cmd_count++;
730 dev_dbg(dev, "%s - line control command being issued\n", __func__);
731 spin_unlock_irqrestore(&priv->lock, flags);
732 goto send;
733 } else
734 spin_unlock_irqrestore(&priv->lock, flags);
735
736 count = kfifo_out_locked(&priv->write_fifo,
737 &port->interrupt_out_buffer[offset],
738 port->interrupt_out_size - offset,
739 &priv->lock);
740 if (count == 0)
741 return;
742
743 switch (priv->pkt_fmt) {
744 default:
745 case packet_format_1:
746 port->interrupt_out_buffer[1] = count;
747 break;
748 case packet_format_2:
749 port->interrupt_out_buffer[0] |= count;
750 }
751
752 dev_dbg(dev, "%s - count is %d\n", __func__, count);
753
754send:
755 spin_lock_irqsave(&priv->lock, flags);
756 priv->write_urb_in_use = 1;
757 spin_unlock_irqrestore(&priv->lock, flags);
758
759 if (priv->cmd_ctrl)
760 actual_size = 1;
761 else
762 actual_size = count +
763 (priv->pkt_fmt == packet_format_1 ? 2 : 1);
764
765 usb_serial_debug_data(dev, __func__, port->interrupt_out_size,
766 port->interrupt_out_urb->transfer_buffer);
767
768 usb_fill_int_urb(port->interrupt_out_urb, port->serial->dev,
769 usb_sndintpipe(port->serial->dev, port->interrupt_out_endpointAddress),
770 port->interrupt_out_buffer, actual_size,
771 cypress_write_int_callback, port, priv->write_urb_interval);
772 result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC);
773 if (result) {
774 dev_err_console(port,
775 "%s - failed submitting write urb, error %d\n",
776 __func__, result);
777 priv->write_urb_in_use = 0;
778 cypress_set_dead(port);
779 }
780
781 spin_lock_irqsave(&priv->lock, flags);
782 if (priv->cmd_ctrl)
783 priv->cmd_ctrl = 0;
784
785 /* do not count the line control and size bytes */
786 priv->bytes_out += count;
787 spin_unlock_irqrestore(&priv->lock, flags);
788
789 usb_serial_port_softint(port);
790} /* cypress_send */
791
792
793/* returns how much space is available in the soft buffer */
794static int cypress_write_room(struct tty_struct *tty)
795{
796 struct usb_serial_port *port = tty->driver_data;
797 struct cypress_private *priv = usb_get_serial_port_data(port);
798 int room = 0;
799 unsigned long flags;
800
801 spin_lock_irqsave(&priv->lock, flags);
802 room = kfifo_avail(&priv->write_fifo);
803 spin_unlock_irqrestore(&priv->lock, flags);
804
805 dev_dbg(&port->dev, "%s - returns %d\n", __func__, room);
806 return room;
807}
808
809
810static int cypress_tiocmget(struct tty_struct *tty)
811{
812 struct usb_serial_port *port = tty->driver_data;
813 struct cypress_private *priv = usb_get_serial_port_data(port);
814 __u8 status, control;
815 unsigned int result = 0;
816 unsigned long flags;
817
818 spin_lock_irqsave(&priv->lock, flags);
819 control = priv->line_control;
820 status = priv->current_status;
821 spin_unlock_irqrestore(&priv->lock, flags);
822
823 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
824 | ((control & CONTROL_RTS) ? TIOCM_RTS : 0)
825 | ((status & UART_CTS) ? TIOCM_CTS : 0)
826 | ((status & UART_DSR) ? TIOCM_DSR : 0)
827 | ((status & UART_RI) ? TIOCM_RI : 0)
828 | ((status & UART_CD) ? TIOCM_CD : 0);
829
830 dev_dbg(&port->dev, "%s - result = %x\n", __func__, result);
831
832 return result;
833}
834
835
836static int cypress_tiocmset(struct tty_struct *tty,
837 unsigned int set, unsigned int clear)
838{
839 struct usb_serial_port *port = tty->driver_data;
840 struct cypress_private *priv = usb_get_serial_port_data(port);
841 unsigned long flags;
842
843 spin_lock_irqsave(&priv->lock, flags);
844 if (set & TIOCM_RTS)
845 priv->line_control |= CONTROL_RTS;
846 if (set & TIOCM_DTR)
847 priv->line_control |= CONTROL_DTR;
848 if (clear & TIOCM_RTS)
849 priv->line_control &= ~CONTROL_RTS;
850 if (clear & TIOCM_DTR)
851 priv->line_control &= ~CONTROL_DTR;
852 priv->cmd_ctrl = 1;
853 spin_unlock_irqrestore(&priv->lock, flags);
854
855 return cypress_write(tty, port, NULL, 0);
856}
857
858static void cypress_earthmate_init_termios(struct tty_struct *tty)
859{
860 tty_encode_baud_rate(tty, 4800, 4800);
861}
862
863static void cypress_set_termios(struct tty_struct *tty,
864 struct usb_serial_port *port, struct ktermios *old_termios)
865{
866 struct cypress_private *priv = usb_get_serial_port_data(port);
867 struct device *dev = &port->dev;
868 int data_bits, stop_bits, parity_type, parity_enable;
869 unsigned int cflag;
870 unsigned long flags;
871 __u8 oldlines;
872 int linechange = 0;
873
874 /* Unsupported features need clearing */
875 tty->termios.c_cflag &= ~(CMSPAR|CRTSCTS);
876
877 cflag = tty->termios.c_cflag;
878
879 /* set number of data bits, parity, stop bits */
880 /* when parity is disabled the parity type bit is ignored */
881
882 /* 1 means 2 stop bits, 0 means 1 stop bit */
883 stop_bits = cflag & CSTOPB ? 1 : 0;
884
885 if (cflag & PARENB) {
886 parity_enable = 1;
887 /* 1 means odd parity, 0 means even parity */
888 parity_type = cflag & PARODD ? 1 : 0;
889 } else
890 parity_enable = parity_type = 0;
891
892 switch (cflag & CSIZE) {
893 case CS5:
894 data_bits = 0;
895 break;
896 case CS6:
897 data_bits = 1;
898 break;
899 case CS7:
900 data_bits = 2;
901 break;
902 case CS8:
903 data_bits = 3;
904 break;
905 default:
906 dev_err(dev, "%s - CSIZE was set, but not CS5-CS8\n", __func__);
907 data_bits = 3;
908 }
909 spin_lock_irqsave(&priv->lock, flags);
910 oldlines = priv->line_control;
911 if ((cflag & CBAUD) == B0) {
912 /* drop dtr and rts */
913 dev_dbg(dev, "%s - dropping the lines, baud rate 0bps\n", __func__);
914 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
915 } else
916 priv->line_control = (CONTROL_DTR | CONTROL_RTS);
917 spin_unlock_irqrestore(&priv->lock, flags);
918
919 dev_dbg(dev, "%s - sending %d stop_bits, %d parity_enable, %d parity_type, %d data_bits (+5)\n",
920 __func__, stop_bits, parity_enable, parity_type, data_bits);
921
922 cypress_serial_control(tty, port, tty_get_baud_rate(tty),
923 data_bits, stop_bits,
924 parity_enable, parity_type,
925 0, CYPRESS_SET_CONFIG);
926
927 /* we perform a CYPRESS_GET_CONFIG so that the current settings are
928 * filled into the private structure this should confirm that all is
929 * working if it returns what we just set */
930 cypress_serial_control(tty, port, 0, 0, 0, 0, 0, 0, CYPRESS_GET_CONFIG);
931
932 /* Here we can define custom tty settings for devices; the main tty
933 * termios flag base comes from empeg.c */
934
935 spin_lock_irqsave(&priv->lock, flags);
936 if (priv->chiptype == CT_EARTHMATE && priv->baud_rate == 4800) {
937 dev_dbg(dev, "Using custom termios settings for a baud rate of 4800bps.\n");
938 /* define custom termios settings for NMEA protocol */
939
940 tty->termios.c_iflag /* input modes - */
941 &= ~(IGNBRK /* disable ignore break */
942 | BRKINT /* disable break causes interrupt */
943 | PARMRK /* disable mark parity errors */
944 | ISTRIP /* disable clear high bit of input char */
945 | INLCR /* disable translate NL to CR */
946 | IGNCR /* disable ignore CR */
947 | ICRNL /* disable translate CR to NL */
948 | IXON); /* disable enable XON/XOFF flow control */
949
950 tty->termios.c_oflag /* output modes */
951 &= ~OPOST; /* disable postprocess output char */
952
953 tty->termios.c_lflag /* line discipline modes */
954 &= ~(ECHO /* disable echo input characters */
955 | ECHONL /* disable echo new line */
956 | ICANON /* disable erase, kill, werase, and rprnt
957 special characters */
958 | ISIG /* disable interrupt, quit, and suspend
959 special characters */
960 | IEXTEN); /* disable non-POSIX special characters */
961 } /* CT_CYPHIDCOM: Application should handle this for device */
962
963 linechange = (priv->line_control != oldlines);
964 spin_unlock_irqrestore(&priv->lock, flags);
965
966 /* if necessary, set lines */
967 if (linechange) {
968 priv->cmd_ctrl = 1;
969 cypress_write(tty, port, NULL, 0);
970 }
971} /* cypress_set_termios */
972
973
974/* returns amount of data still left in soft buffer */
975static int cypress_chars_in_buffer(struct tty_struct *tty)
976{
977 struct usb_serial_port *port = tty->driver_data;
978 struct cypress_private *priv = usb_get_serial_port_data(port);
979 int chars = 0;
980 unsigned long flags;
981
982 spin_lock_irqsave(&priv->lock, flags);
983 chars = kfifo_len(&priv->write_fifo);
984 spin_unlock_irqrestore(&priv->lock, flags);
985
986 dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
987 return chars;
988}
989
990
991static void cypress_throttle(struct tty_struct *tty)
992{
993 struct usb_serial_port *port = tty->driver_data;
994 struct cypress_private *priv = usb_get_serial_port_data(port);
995
996 spin_lock_irq(&priv->lock);
997 priv->rx_flags = THROTTLED;
998 spin_unlock_irq(&priv->lock);
999}
1000
1001
1002static void cypress_unthrottle(struct tty_struct *tty)
1003{
1004 struct usb_serial_port *port = tty->driver_data;
1005 struct cypress_private *priv = usb_get_serial_port_data(port);
1006 int actually_throttled, result;
1007
1008 spin_lock_irq(&priv->lock);
1009 actually_throttled = priv->rx_flags & ACTUALLY_THROTTLED;
1010 priv->rx_flags = 0;
1011 spin_unlock_irq(&priv->lock);
1012
1013 if (!priv->comm_is_ok)
1014 return;
1015
1016 if (actually_throttled) {
1017 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
1018 if (result) {
1019 dev_err(&port->dev, "%s - failed submitting read urb, "
1020 "error %d\n", __func__, result);
1021 cypress_set_dead(port);
1022 }
1023 }
1024}
1025
1026
1027static void cypress_read_int_callback(struct urb *urb)
1028{
1029 struct usb_serial_port *port = urb->context;
1030 struct cypress_private *priv = usb_get_serial_port_data(port);
1031 struct device *dev = &urb->dev->dev;
1032 struct tty_struct *tty;
1033 unsigned char *data = urb->transfer_buffer;
1034 unsigned long flags;
1035 char tty_flag = TTY_NORMAL;
1036 int bytes = 0;
1037 int result;
1038 int i = 0;
1039 int status = urb->status;
1040
1041 switch (status) {
1042 case 0: /* success */
1043 break;
1044 case -ECONNRESET:
1045 case -ENOENT:
1046 case -ESHUTDOWN:
1047 /* precursor to disconnect so just go away */
1048 return;
1049 case -EPIPE:
1050 /* Can't call usb_clear_halt while in_interrupt */
1051 fallthrough;
1052 default:
1053 /* something ugly is going on... */
1054 dev_err(dev, "%s - unexpected nonzero read status received: %d\n",
1055 __func__, status);
1056 cypress_set_dead(port);
1057 return;
1058 }
1059
1060 spin_lock_irqsave(&priv->lock, flags);
1061 if (priv->rx_flags & THROTTLED) {
1062 dev_dbg(dev, "%s - now throttling\n", __func__);
1063 priv->rx_flags |= ACTUALLY_THROTTLED;
1064 spin_unlock_irqrestore(&priv->lock, flags);
1065 return;
1066 }
1067 spin_unlock_irqrestore(&priv->lock, flags);
1068
1069 tty = tty_port_tty_get(&port->port);
1070 if (!tty) {
1071 dev_dbg(dev, "%s - bad tty pointer - exiting\n", __func__);
1072 return;
1073 }
1074
1075 spin_lock_irqsave(&priv->lock, flags);
1076 result = urb->actual_length;
1077 switch (priv->pkt_fmt) {
1078 default:
1079 case packet_format_1:
1080 /* This is for the CY7C64013... */
1081 priv->current_status = data[0] & 0xF8;
1082 bytes = data[1] + 2;
1083 i = 2;
1084 break;
1085 case packet_format_2:
1086 /* This is for the CY7C63743... */
1087 priv->current_status = data[0] & 0xF8;
1088 bytes = (data[0] & 0x07) + 1;
1089 i = 1;
1090 break;
1091 }
1092 spin_unlock_irqrestore(&priv->lock, flags);
1093 if (result < bytes) {
1094 dev_dbg(dev,
1095 "%s - wrong packet size - received %d bytes but packet said %d bytes\n",
1096 __func__, result, bytes);
1097 goto continue_read;
1098 }
1099
1100 usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
1101
1102 spin_lock_irqsave(&priv->lock, flags);
1103 /* check to see if status has changed */
1104 if (priv->current_status != priv->prev_status) {
1105 u8 delta = priv->current_status ^ priv->prev_status;
1106
1107 if (delta & UART_MSR_MASK) {
1108 if (delta & UART_CTS)
1109 port->icount.cts++;
1110 if (delta & UART_DSR)
1111 port->icount.dsr++;
1112 if (delta & UART_RI)
1113 port->icount.rng++;
1114 if (delta & UART_CD)
1115 port->icount.dcd++;
1116
1117 wake_up_interruptible(&port->port.delta_msr_wait);
1118 }
1119
1120 priv->prev_status = priv->current_status;
1121 }
1122 spin_unlock_irqrestore(&priv->lock, flags);
1123
1124 /* hangup, as defined in acm.c... this might be a bad place for it
1125 * though */
1126 if (tty && !C_CLOCAL(tty) && !(priv->current_status & UART_CD)) {
1127 dev_dbg(dev, "%s - calling hangup\n", __func__);
1128 tty_hangup(tty);
1129 goto continue_read;
1130 }
1131
1132 /* There is one error bit... I'm assuming it is a parity error
1133 * indicator as the generic firmware will set this bit to 1 if a
1134 * parity error occurs.
1135 * I can not find reference to any other error events. */
1136 spin_lock_irqsave(&priv->lock, flags);
1137 if (priv->current_status & CYP_ERROR) {
1138 spin_unlock_irqrestore(&priv->lock, flags);
1139 tty_flag = TTY_PARITY;
1140 dev_dbg(dev, "%s - Parity Error detected\n", __func__);
1141 } else
1142 spin_unlock_irqrestore(&priv->lock, flags);
1143
1144 /* process read if there is data other than line status */
1145 if (bytes > i) {
1146 tty_insert_flip_string_fixed_flag(&port->port, data + i,
1147 tty_flag, bytes - i);
1148 tty_flip_buffer_push(&port->port);
1149 }
1150
1151 spin_lock_irqsave(&priv->lock, flags);
1152 /* control and status byte(s) are also counted */
1153 priv->bytes_in += bytes;
1154 spin_unlock_irqrestore(&priv->lock, flags);
1155
1156continue_read:
1157 tty_kref_put(tty);
1158
1159 /* Continue trying to always read */
1160
1161 if (priv->comm_is_ok) {
1162 usb_fill_int_urb(port->interrupt_in_urb, port->serial->dev,
1163 usb_rcvintpipe(port->serial->dev,
1164 port->interrupt_in_endpointAddress),
1165 port->interrupt_in_urb->transfer_buffer,
1166 port->interrupt_in_urb->transfer_buffer_length,
1167 cypress_read_int_callback, port,
1168 priv->read_urb_interval);
1169 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
1170 if (result && result != -EPERM) {
1171 dev_err(dev, "%s - failed resubmitting read urb, error %d\n",
1172 __func__, result);
1173 cypress_set_dead(port);
1174 }
1175 }
1176} /* cypress_read_int_callback */
1177
1178
1179static void cypress_write_int_callback(struct urb *urb)
1180{
1181 struct usb_serial_port *port = urb->context;
1182 struct cypress_private *priv = usb_get_serial_port_data(port);
1183 struct device *dev = &urb->dev->dev;
1184 int status = urb->status;
1185
1186 switch (status) {
1187 case 0:
1188 /* success */
1189 break;
1190 case -ECONNRESET:
1191 case -ENOENT:
1192 case -ESHUTDOWN:
1193 /* this urb is terminated, clean up */
1194 dev_dbg(dev, "%s - urb shutting down with status: %d\n",
1195 __func__, status);
1196 priv->write_urb_in_use = 0;
1197 return;
1198 case -EPIPE:
1199 /* Cannot call usb_clear_halt while in_interrupt */
1200 fallthrough;
1201 default:
1202 dev_err(dev, "%s - unexpected nonzero write status received: %d\n",
1203 __func__, status);
1204 cypress_set_dead(port);
1205 break;
1206 }
1207 priv->write_urb_in_use = 0;
1208
1209 /* send any buffered data */
1210 cypress_send(port);
1211}
1212
1213module_usb_serial_driver(serial_drivers, id_table_combined);
1214
1215MODULE_AUTHOR(DRIVER_AUTHOR);
1216MODULE_DESCRIPTION(DRIVER_DESC);
1217MODULE_LICENSE("GPL");
1218
1219module_param(stats, bool, S_IRUGO | S_IWUSR);
1220MODULE_PARM_DESC(stats, "Enable statistics or not");
1221module_param(interval, int, S_IRUGO | S_IWUSR);
1222MODULE_PARM_DESC(interval, "Overrides interrupt interval");
1223module_param(unstable_bauds, bool, S_IRUGO | S_IWUSR);
1224MODULE_PARM_DESC(unstable_bauds, "Allow unstable baud rates");