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Linux 3.11-rc3
[cris-mirror.git] / drivers / usb / serial / cypress_m8.c
blobe948dc02795d4ede34c7c132d9fb03a1142cf0f5
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/init.h>
31 #include <linux/slab.h>
32 #include <linux/tty.h>
33 #include <linux/tty_driver.h>
34 #include <linux/tty_flip.h>
35 #include <linux/module.h>
36 #include <linux/moduleparam.h>
37 #include <linux/spinlock.h>
38 #include <linux/usb.h>
39 #include <linux/usb/serial.h>
40 #include <linux/serial.h>
41 #include <linux/kfifo.h>
42 #include <linux/delay.h>
43 #include <linux/uaccess.h>
44 #include <asm/unaligned.h>
45
46 #include "cypress_m8.h"
47
48
49 static bool stats;
50 static int interval;
51 static bool unstable_bauds;
52
53 #define DRIVER_AUTHOR "Lonnie Mendez <dignome@gmail.com>, Neil Whelchel <koyama@firstlight.net>"
54 #define DRIVER_DESC "Cypress USB to Serial Driver"
55
56 /* write buffer size defines */
57 #define CYPRESS_BUF_SIZE 1024
58
59 static const struct usb_device_id id_table_earthmate[] = {
60 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
61 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
62 { } /* Terminating entry */
63 };
64
65 static const struct usb_device_id id_table_cyphidcomrs232[] = {
66 { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
67 { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) },
68 { USB_DEVICE(VENDOR_ID_FRWD, PRODUCT_ID_CYPHIDCOM_FRWD) },
69 { } /* Terminating entry */
70 };
71
72 static const struct usb_device_id id_table_nokiaca42v2[] = {
73 { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
74 { } /* Terminating entry */
75 };
76
77 static const struct usb_device_id id_table_combined[] = {
78 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
79 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
80 { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
81 { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) },
82 { USB_DEVICE(VENDOR_ID_FRWD, PRODUCT_ID_CYPHIDCOM_FRWD) },
83 { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
84 { } /* Terminating entry */
85 };
86
87 MODULE_DEVICE_TABLE(usb, id_table_combined);
88
89 enum packet_format {
90 packet_format_1, /* b0:status, b1:payload count */
91 packet_format_2 /* b0[7:3]:status, b0[2:0]:payload count */
92 };
93
94 struct cypress_private {
95 spinlock_t lock; /* private lock */
96 int chiptype; /* identifier of device, for quirks/etc */
97 int bytes_in; /* used for statistics */
98 int bytes_out; /* used for statistics */
99 int cmd_count; /* used for statistics */
100 int cmd_ctrl; /* always set this to 1 before issuing a command */
101 struct kfifo write_fifo; /* write fifo */
102 int write_urb_in_use; /* write urb in use indicator */
103 int write_urb_interval; /* interval to use for write urb */
104 int read_urb_interval; /* interval to use for read urb */
105 int comm_is_ok; /* true if communication is (still) ok */
106 int termios_initialized;
107 __u8 line_control; /* holds dtr / rts value */
108 __u8 current_status; /* received from last read - info on dsr,cts,cd,ri,etc */
109 __u8 current_config; /* stores the current configuration byte */
110 __u8 rx_flags; /* throttling - used from whiteheat/ftdi_sio */
111 enum packet_format pkt_fmt; /* format to use for packet send / receive */
112 int get_cfg_unsafe; /* If true, the CYPRESS_GET_CONFIG is unsafe */
113 int baud_rate; /* stores current baud rate in
114 integer form */
115 int isthrottled; /* if throttled, discard reads */
116 char prev_status, diff_status; /* used for TIOCMIWAIT */
117 /* we pass a pointer to this as the argument sent to
118 cypress_set_termios old_termios */
119 struct ktermios tmp_termios; /* stores the old termios settings */
120 };
121
122 /* function prototypes for the Cypress USB to serial device */
123 static int cypress_earthmate_port_probe(struct usb_serial_port *port);
124 static int cypress_hidcom_port_probe(struct usb_serial_port *port);
125 static int cypress_ca42v2_port_probe(struct usb_serial_port *port);
126 static int cypress_port_remove(struct usb_serial_port *port);
127 static int cypress_open(struct tty_struct *tty, struct usb_serial_port *port);
128 static void cypress_close(struct usb_serial_port *port);
129 static void cypress_dtr_rts(struct usb_serial_port *port, int on);
130 static int cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
131 const unsigned char *buf, int count);
132 static void cypress_send(struct usb_serial_port *port);
133 static int cypress_write_room(struct tty_struct *tty);
134 static void cypress_set_termios(struct tty_struct *tty,
135 struct usb_serial_port *port, struct ktermios *old);
136 static int cypress_tiocmget(struct tty_struct *tty);
137 static int cypress_tiocmset(struct tty_struct *tty,
138 unsigned int set, unsigned int clear);
139 static int cypress_tiocmiwait(struct tty_struct *tty, unsigned long arg);
140 static int cypress_chars_in_buffer(struct tty_struct *tty);
141 static void cypress_throttle(struct tty_struct *tty);
142 static void cypress_unthrottle(struct tty_struct *tty);
143 static void cypress_set_dead(struct usb_serial_port *port);
144 static void cypress_read_int_callback(struct urb *urb);
145 static void cypress_write_int_callback(struct urb *urb);
146
147 static struct usb_serial_driver cypress_earthmate_device = {
148 .driver = {
149 .owner = THIS_MODULE,
150 .name = "earthmate",
151 },
152 .description = "DeLorme Earthmate USB",
153 .id_table = id_table_earthmate,
154 .num_ports = 1,
155 .port_probe = cypress_earthmate_port_probe,
156 .port_remove = cypress_port_remove,
157 .open = cypress_open,
158 .close = cypress_close,
159 .dtr_rts = cypress_dtr_rts,
160 .write = cypress_write,
161 .write_room = cypress_write_room,
162 .set_termios = cypress_set_termios,
163 .tiocmget = cypress_tiocmget,
164 .tiocmset = cypress_tiocmset,
165 .tiocmiwait = cypress_tiocmiwait,
166 .chars_in_buffer = cypress_chars_in_buffer,
167 .throttle = cypress_throttle,
168 .unthrottle = cypress_unthrottle,
169 .read_int_callback = cypress_read_int_callback,
170 .write_int_callback = cypress_write_int_callback,
171 };
172
173 static struct usb_serial_driver cypress_hidcom_device = {
174 .driver = {
175 .owner = THIS_MODULE,
176 .name = "cyphidcom",
177 },
178 .description = "HID->COM RS232 Adapter",
179 .id_table = id_table_cyphidcomrs232,
180 .num_ports = 1,
181 .port_probe = cypress_hidcom_port_probe,
182 .port_remove = cypress_port_remove,
183 .open = cypress_open,
184 .close = cypress_close,
185 .dtr_rts = cypress_dtr_rts,
186 .write = cypress_write,
187 .write_room = cypress_write_room,
188 .set_termios = cypress_set_termios,
189 .tiocmget = cypress_tiocmget,
190 .tiocmset = cypress_tiocmset,
191 .tiocmiwait = cypress_tiocmiwait,
192 .chars_in_buffer = cypress_chars_in_buffer,
193 .throttle = cypress_throttle,
194 .unthrottle = cypress_unthrottle,
195 .read_int_callback = cypress_read_int_callback,
196 .write_int_callback = cypress_write_int_callback,
197 };
198
199 static struct usb_serial_driver cypress_ca42v2_device = {
200 .driver = {
201 .owner = THIS_MODULE,
202 .name = "nokiaca42v2",
203 },
204 .description = "Nokia CA-42 V2 Adapter",
205 .id_table = id_table_nokiaca42v2,
206 .num_ports = 1,
207 .port_probe = cypress_ca42v2_port_probe,
208 .port_remove = cypress_port_remove,
209 .open = cypress_open,
210 .close = cypress_close,
211 .dtr_rts = cypress_dtr_rts,
212 .write = cypress_write,
213 .write_room = cypress_write_room,
214 .set_termios = cypress_set_termios,
215 .tiocmget = cypress_tiocmget,
216 .tiocmset = cypress_tiocmset,
217 .tiocmiwait = cypress_tiocmiwait,
218 .chars_in_buffer = cypress_chars_in_buffer,
219 .throttle = cypress_throttle,
220 .unthrottle = cypress_unthrottle,
221 .read_int_callback = cypress_read_int_callback,
222 .write_int_callback = cypress_write_int_callback,
223 };
224
225 static struct usb_serial_driver * const serial_drivers[] = {
226 &cypress_earthmate_device, &cypress_hidcom_device,
227 &cypress_ca42v2_device, NULL
228 };
229
230 /*****************************************************************************
231 * Cypress serial helper functions
232 *****************************************************************************/
233
234 /* FRWD Dongle hidcom needs to skip reset and speed checks */
235 static inline bool is_frwd(struct usb_device *dev)
236 {
237 return ((le16_to_cpu(dev->descriptor.idVendor) == VENDOR_ID_FRWD) &&
238 (le16_to_cpu(dev->descriptor.idProduct) == PRODUCT_ID_CYPHIDCOM_FRWD));
239 }
240
241 static int analyze_baud_rate(struct usb_serial_port *port, speed_t new_rate)
242 {
243 struct cypress_private *priv;
244 priv = usb_get_serial_port_data(port);
245
246 if (unstable_bauds)
247 return new_rate;
248
249 /* FRWD Dongle uses 115200 bps */
250 if (is_frwd(port->serial->dev))
251 return new_rate;
252
253 /*
254 * The general purpose firmware for the Cypress M8 allows for
255 * a maximum speed of 57600bps (I have no idea whether DeLorme
256 * chose to use the general purpose firmware or not), if you
257 * need to modify this speed setting for your own project
258 * please add your own chiptype and modify the code likewise.
259 * The Cypress HID->COM device will work successfully up to
260 * 115200bps (but the actual throughput is around 3kBps).
261 */
262 if (port->serial->dev->speed == USB_SPEED_LOW) {
263 /*
264 * Mike Isely <isely@pobox.com> 2-Feb-2008: The
265 * Cypress app note that describes this mechanism
266 * states the the low-speed part can't handle more
267 * than 800 bytes/sec, in which case 4800 baud is the
268 * safest speed for a part like that.
269 */
270 if (new_rate > 4800) {
271 dev_dbg(&port->dev,
272 "%s - failed setting baud rate, device incapable speed %d\n",
273 __func__, new_rate);
274 return -1;
275 }
276 }
277 switch (priv->chiptype) {
278 case CT_EARTHMATE:
279 if (new_rate <= 600) {
280 /* 300 and 600 baud rates are supported under
281 * the generic firmware, but are not used with
282 * NMEA and SiRF protocols */
283 dev_dbg(&port->dev,
284 "%s - failed setting baud rate, unsupported speed of %d on Earthmate GPS",
285 __func__, new_rate);
286 return -1;
287 }
288 break;
289 default:
290 break;
291 }
292 return new_rate;
293 }
294
295
296 /* This function can either set or retrieve the current serial line settings */
297 static int cypress_serial_control(struct tty_struct *tty,
298 struct usb_serial_port *port, speed_t baud_rate, int data_bits,
299 int stop_bits, int parity_enable, int parity_type, int reset,
300 int cypress_request_type)
301 {
302 int new_baudrate = 0, retval = 0, tries = 0;
303 struct cypress_private *priv;
304 struct device *dev = &port->dev;
305 u8 *feature_buffer;
306 const unsigned int feature_len = 5;
307 unsigned long flags;
308
309 priv = usb_get_serial_port_data(port);
310
311 if (!priv->comm_is_ok)
312 return -ENODEV;
313
314 feature_buffer = kcalloc(feature_len, sizeof(u8), GFP_KERNEL);
315 if (!feature_buffer)
316 return -ENOMEM;
317
318 switch (cypress_request_type) {
319 case CYPRESS_SET_CONFIG:
320 /* 0 means 'Hang up' so doesn't change the true bit rate */
321 new_baudrate = priv->baud_rate;
322 if (baud_rate && baud_rate != priv->baud_rate) {
323 dev_dbg(dev, "%s - baud rate is changing\n", __func__);
324 retval = analyze_baud_rate(port, baud_rate);
325 if (retval >= 0) {
326 new_baudrate = retval;
327 dev_dbg(dev, "%s - New baud rate set to %d\n",
328 __func__, new_baudrate);
329 }
330 }
331 dev_dbg(dev, "%s - baud rate is being sent as %d\n", __func__,
332 new_baudrate);
333
334 /* fill the feature_buffer with new configuration */
335 put_unaligned_le32(new_baudrate, feature_buffer);
336 feature_buffer[4] |= data_bits; /* assign data bits in 2 bit space ( max 3 ) */
337 /* 1 bit gap */
338 feature_buffer[4] |= (stop_bits << 3); /* assign stop bits in 1 bit space */
339 feature_buffer[4] |= (parity_enable << 4); /* assign parity flag in 1 bit space */
340 feature_buffer[4] |= (parity_type << 5); /* assign parity type in 1 bit space */
341 /* 1 bit gap */
342 feature_buffer[4] |= (reset << 7); /* assign reset at end of byte, 1 bit space */
343
344 dev_dbg(dev, "%s - device is being sent this feature report:\n", __func__);
345 dev_dbg(dev, "%s - %02X - %02X - %02X - %02X - %02X\n", __func__,
346 feature_buffer[0], feature_buffer[1],
347 feature_buffer[2], feature_buffer[3],
348 feature_buffer[4]);
349
350 do {
351 retval = usb_control_msg(port->serial->dev,
352 usb_sndctrlpipe(port->serial->dev, 0),
353 HID_REQ_SET_REPORT,
354 USB_DIR_OUT | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
355 0x0300, 0, feature_buffer,
356 feature_len, 500);
357
358 if (tries++ >= 3)
359 break;
360
361 } while (retval != feature_len &&
362 retval != -ENODEV);
363
364 if (retval != feature_len) {
365 dev_err(dev, "%s - failed sending serial line settings - %d\n",
366 __func__, retval);
367 cypress_set_dead(port);
368 } else {
369 spin_lock_irqsave(&priv->lock, flags);
370 priv->baud_rate = new_baudrate;
371 priv->current_config = feature_buffer[4];
372 spin_unlock_irqrestore(&priv->lock, flags);
373 /* If we asked for a speed change encode it */
374 if (baud_rate)
375 tty_encode_baud_rate(tty,
376 new_baudrate, new_baudrate);
377 }
378 break;
379 case CYPRESS_GET_CONFIG:
380 if (priv->get_cfg_unsafe) {
381 /* Not implemented for this device,
382 and if we try to do it we're likely
383 to crash the hardware. */
384 retval = -ENOTTY;
385 goto out;
386 }
387 dev_dbg(dev, "%s - retreiving serial line settings\n", __func__);
388 do {
389 retval = usb_control_msg(port->serial->dev,
390 usb_rcvctrlpipe(port->serial->dev, 0),
391 HID_REQ_GET_REPORT,
392 USB_DIR_IN | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
393 0x0300, 0, feature_buffer,
394 feature_len, 500);
395
396 if (tries++ >= 3)
397 break;
398 } while (retval != feature_len
399 && retval != -ENODEV);
400
401 if (retval != feature_len) {
402 dev_err(dev, "%s - failed to retrieve serial line settings - %d\n",
403 __func__, retval);
404 cypress_set_dead(port);
405 goto out;
406 } else {
407 spin_lock_irqsave(&priv->lock, flags);
408 /* store the config in one byte, and later
409 use bit masks to check values */
410 priv->current_config = feature_buffer[4];
411 priv->baud_rate = get_unaligned_le32(feature_buffer);
412 spin_unlock_irqrestore(&priv->lock, flags);
413 }
414 }
415 spin_lock_irqsave(&priv->lock, flags);
416 ++priv->cmd_count;
417 spin_unlock_irqrestore(&priv->lock, flags);
418 out:
419 kfree(feature_buffer);
420 return retval;
421 } /* cypress_serial_control */
422
423
424 static void cypress_set_dead(struct usb_serial_port *port)
425 {
426 struct cypress_private *priv = usb_get_serial_port_data(port);
427 unsigned long flags;
428
429 spin_lock_irqsave(&priv->lock, flags);
430 if (!priv->comm_is_ok) {
431 spin_unlock_irqrestore(&priv->lock, flags);
432 return;
433 }
434 priv->comm_is_ok = 0;
435 spin_unlock_irqrestore(&priv->lock, flags);
436
437 dev_err(&port->dev, "cypress_m8 suspending failing port %d - "
438 "interval might be too short\n", port->port_number);
439 }
440
441
442 /*****************************************************************************
443 * Cypress serial driver functions
444 *****************************************************************************/
445
446
447 static int cypress_generic_port_probe(struct usb_serial_port *port)
448 {
449 struct usb_serial *serial = port->serial;
450 struct cypress_private *priv;
451
452 priv = kzalloc(sizeof(struct cypress_private), GFP_KERNEL);
453 if (!priv)
454 return -ENOMEM;
455
456 priv->comm_is_ok = !0;
457 spin_lock_init(&priv->lock);
458 if (kfifo_alloc(&priv->write_fifo, CYPRESS_BUF_SIZE, GFP_KERNEL)) {
459 kfree(priv);
460 return -ENOMEM;
461 }
462
463 /* Skip reset for FRWD device. It is a workaound:
464 device hangs if it receives SET_CONFIGURE in Configured
465 state. */
466 if (!is_frwd(serial->dev))
467 usb_reset_configuration(serial->dev);
468
469 priv->cmd_ctrl = 0;
470 priv->line_control = 0;
471 priv->termios_initialized = 0;
472 priv->rx_flags = 0;
473 /* Default packet format setting is determined by packet size.
474 Anything with a size larger then 9 must have a separate
475 count field since the 3 bit count field is otherwise too
476 small. Otherwise we can use the slightly more compact
477 format. This is in accordance with the cypress_m8 serial
478 converter app note. */
479 if (port->interrupt_out_size > 9)
480 priv->pkt_fmt = packet_format_1;
481 else
482 priv->pkt_fmt = packet_format_2;
483
484 if (interval > 0) {
485 priv->write_urb_interval = interval;
486 priv->read_urb_interval = interval;
487 dev_dbg(&port->dev, "%s - read & write intervals forced to %d\n",
488 __func__, interval);
489 } else {
490 priv->write_urb_interval = port->interrupt_out_urb->interval;
491 priv->read_urb_interval = port->interrupt_in_urb->interval;
492 dev_dbg(&port->dev, "%s - intervals: read=%d write=%d\n",
493 __func__, priv->read_urb_interval,
494 priv->write_urb_interval);
495 }
496 usb_set_serial_port_data(port, priv);
497
498 return 0;
499 }
500
501
502 static int cypress_earthmate_port_probe(struct usb_serial_port *port)
503 {
504 struct usb_serial *serial = port->serial;
505 struct cypress_private *priv;
506 int ret;
507
508 ret = cypress_generic_port_probe(port);
509 if (ret) {
510 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
511 return ret;
512 }
513
514 priv = usb_get_serial_port_data(port);
515 priv->chiptype = CT_EARTHMATE;
516 /* All Earthmate devices use the separated-count packet
517 format! Idiotic. */
518 priv->pkt_fmt = packet_format_1;
519 if (serial->dev->descriptor.idProduct !=
520 cpu_to_le16(PRODUCT_ID_EARTHMATEUSB)) {
521 /* The old original USB Earthmate seemed able to
522 handle GET_CONFIG requests; everything they've
523 produced since that time crashes if this command is
524 attempted :-( */
525 dev_dbg(&port->dev,
526 "%s - Marking this device as unsafe for GET_CONFIG commands\n",
527 __func__);
528 priv->get_cfg_unsafe = !0;
529 }
530
531 return 0;
532 }
533
534 static int cypress_hidcom_port_probe(struct usb_serial_port *port)
535 {
536 struct cypress_private *priv;
537 int ret;
538
539 ret = cypress_generic_port_probe(port);
540 if (ret) {
541 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
542 return ret;
543 }
544
545 priv = usb_get_serial_port_data(port);
546 priv->chiptype = CT_CYPHIDCOM;
547
548 return 0;
549 }
550
551 static int cypress_ca42v2_port_probe(struct usb_serial_port *port)
552 {
553 struct cypress_private *priv;
554 int ret;
555
556 ret = cypress_generic_port_probe(port);
557 if (ret) {
558 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
559 return ret;
560 }
561
562 priv = usb_get_serial_port_data(port);
563 priv->chiptype = CT_CA42V2;
564
565 return 0;
566 }
567
568 static int cypress_port_remove(struct usb_serial_port *port)
569 {
570 struct cypress_private *priv;
571
572 priv = usb_get_serial_port_data(port);
573
574 kfifo_free(&priv->write_fifo);
575 kfree(priv);
576
577 return 0;
578 }
579
580 static int cypress_open(struct tty_struct *tty, struct usb_serial_port *port)
581 {
582 struct cypress_private *priv = usb_get_serial_port_data(port);
583 struct usb_serial *serial = port->serial;
584 unsigned long flags;
585 int result = 0;
586
587 if (!priv->comm_is_ok)
588 return -EIO;
589
590 /* clear halts before open */
591 usb_clear_halt(serial->dev, 0x81);
592 usb_clear_halt(serial->dev, 0x02);
593
594 spin_lock_irqsave(&priv->lock, flags);
595 /* reset read/write statistics */
596 priv->bytes_in = 0;
597 priv->bytes_out = 0;
598 priv->cmd_count = 0;
599 priv->rx_flags = 0;
600 spin_unlock_irqrestore(&priv->lock, flags);
601
602 /* Set termios */
603 cypress_send(port);
604
605 if (tty)
606 cypress_set_termios(tty, port, &priv->tmp_termios);
607
608 /* setup the port and start reading from the device */
609 if (!port->interrupt_in_urb) {
610 dev_err(&port->dev, "%s - interrupt_in_urb is empty!\n",
611 __func__);
612 return -1;
613 }
614
615 usb_fill_int_urb(port->interrupt_in_urb, serial->dev,
616 usb_rcvintpipe(serial->dev, port->interrupt_in_endpointAddress),
617 port->interrupt_in_urb->transfer_buffer,
618 port->interrupt_in_urb->transfer_buffer_length,
619 cypress_read_int_callback, port, priv->read_urb_interval);
620 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
621
622 if (result) {
623 dev_err(&port->dev,
624 "%s - failed submitting read urb, error %d\n",
625 __func__, result);
626 cypress_set_dead(port);
627 }
628 port->port.drain_delay = 256;
629 return result;
630 } /* cypress_open */
631
632 static void cypress_dtr_rts(struct usb_serial_port *port, int on)
633 {
634 struct cypress_private *priv = usb_get_serial_port_data(port);
635 /* drop dtr and rts */
636 spin_lock_irq(&priv->lock);
637 if (on == 0)
638 priv->line_control = 0;
639 else
640 priv->line_control = CONTROL_DTR | CONTROL_RTS;
641 priv->cmd_ctrl = 1;
642 spin_unlock_irq(&priv->lock);
643 cypress_write(NULL, port, NULL, 0);
644 }
645
646 static void cypress_close(struct usb_serial_port *port)
647 {
648 struct cypress_private *priv = usb_get_serial_port_data(port);
649 unsigned long flags;
650
651 spin_lock_irqsave(&priv->lock, flags);
652 kfifo_reset_out(&priv->write_fifo);
653 spin_unlock_irqrestore(&priv->lock, flags);
654
655 dev_dbg(&port->dev, "%s - stopping urbs\n", __func__);
656 usb_kill_urb(port->interrupt_in_urb);
657 usb_kill_urb(port->interrupt_out_urb);
658
659 if (stats)
660 dev_info(&port->dev, "Statistics: %d Bytes In | %d Bytes Out | %d Commands Issued\n",
661 priv->bytes_in, priv->bytes_out, priv->cmd_count);
662 } /* cypress_close */
663
664
665 static int cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
666 const unsigned char *buf, int count)
667 {
668 struct cypress_private *priv = usb_get_serial_port_data(port);
669
670 dev_dbg(&port->dev, "%s - %d bytes\n", __func__, count);
671
672 /* line control commands, which need to be executed immediately,
673 are not put into the buffer for obvious reasons.
674 */
675 if (priv->cmd_ctrl) {
676 count = 0;
677 goto finish;
678 }
679
680 if (!count)
681 return count;
682
683 count = kfifo_in_locked(&priv->write_fifo, buf, count, &priv->lock);
684
685 finish:
686 cypress_send(port);
687
688 return count;
689 } /* cypress_write */
690
691
692 static void cypress_send(struct usb_serial_port *port)
693 {
694 int count = 0, result, offset, actual_size;
695 struct cypress_private *priv = usb_get_serial_port_data(port);
696 struct device *dev = &port->dev;
697 unsigned long flags;
698
699 if (!priv->comm_is_ok)
700 return;
701
702 dev_dbg(dev, "%s - interrupt out size is %d\n", __func__,
703 port->interrupt_out_size);
704
705 spin_lock_irqsave(&priv->lock, flags);
706 if (priv->write_urb_in_use) {
707 dev_dbg(dev, "%s - can't write, urb in use\n", __func__);
708 spin_unlock_irqrestore(&priv->lock, flags);
709 return;
710 }
711 spin_unlock_irqrestore(&priv->lock, flags);
712
713 /* clear buffer */
714 memset(port->interrupt_out_urb->transfer_buffer, 0,
715 port->interrupt_out_size);
716
717 spin_lock_irqsave(&priv->lock, flags);
718 switch (priv->pkt_fmt) {
719 default:
720 case packet_format_1:
721 /* this is for the CY7C64013... */
722 offset = 2;
723 port->interrupt_out_buffer[0] = priv->line_control;
724 break;
725 case packet_format_2:
726 /* this is for the CY7C63743... */
727 offset = 1;
728 port->interrupt_out_buffer[0] = priv->line_control;
729 break;
730 }
731
732 if (priv->line_control & CONTROL_RESET)
733 priv->line_control &= ~CONTROL_RESET;
734
735 if (priv->cmd_ctrl) {
736 priv->cmd_count++;
737 dev_dbg(dev, "%s - line control command being issued\n", __func__);
738 spin_unlock_irqrestore(&priv->lock, flags);
739 goto send;
740 } else
741 spin_unlock_irqrestore(&priv->lock, flags);
742
743 count = kfifo_out_locked(&priv->write_fifo,
744 &port->interrupt_out_buffer[offset],
745 port->interrupt_out_size - offset,
746 &priv->lock);
747 if (count == 0)
748 return;
749
750 switch (priv->pkt_fmt) {
751 default:
752 case packet_format_1:
753 port->interrupt_out_buffer[1] = count;
754 break;
755 case packet_format_2:
756 port->interrupt_out_buffer[0] |= count;
757 }
758
759 dev_dbg(dev, "%s - count is %d\n", __func__, count);
760
761 send:
762 spin_lock_irqsave(&priv->lock, flags);
763 priv->write_urb_in_use = 1;
764 spin_unlock_irqrestore(&priv->lock, flags);
765
766 if (priv->cmd_ctrl)
767 actual_size = 1;
768 else
769 actual_size = count +
770 (priv->pkt_fmt == packet_format_1 ? 2 : 1);
771
772 usb_serial_debug_data(dev, __func__, port->interrupt_out_size,
773 port->interrupt_out_urb->transfer_buffer);
774
775 usb_fill_int_urb(port->interrupt_out_urb, port->serial->dev,
776 usb_sndintpipe(port->serial->dev, port->interrupt_out_endpointAddress),
777 port->interrupt_out_buffer, port->interrupt_out_size,
778 cypress_write_int_callback, port, priv->write_urb_interval);
779 result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC);
780 if (result) {
781 dev_err_console(port,
782 "%s - failed submitting write urb, error %d\n",
783 __func__, result);
784 priv->write_urb_in_use = 0;
785 cypress_set_dead(port);
786 }
787
788 spin_lock_irqsave(&priv->lock, flags);
789 if (priv->cmd_ctrl)
790 priv->cmd_ctrl = 0;
791
792 /* do not count the line control and size bytes */
793 priv->bytes_out += count;
794 spin_unlock_irqrestore(&priv->lock, flags);
795
796 usb_serial_port_softint(port);
797 } /* cypress_send */
798
799
800 /* returns how much space is available in the soft buffer */
801 static int cypress_write_room(struct tty_struct *tty)
802 {
803 struct usb_serial_port *port = tty->driver_data;
804 struct cypress_private *priv = usb_get_serial_port_data(port);
805 int room = 0;
806 unsigned long flags;
807
808 spin_lock_irqsave(&priv->lock, flags);
809 room = kfifo_avail(&priv->write_fifo);
810 spin_unlock_irqrestore(&priv->lock, flags);
811
812 dev_dbg(&port->dev, "%s - returns %d\n", __func__, room);
813 return room;
814 }
815
816
817 static int cypress_tiocmget(struct tty_struct *tty)
818 {
819 struct usb_serial_port *port = tty->driver_data;
820 struct cypress_private *priv = usb_get_serial_port_data(port);
821 __u8 status, control;
822 unsigned int result = 0;
823 unsigned long flags;
824
825 spin_lock_irqsave(&priv->lock, flags);
826 control = priv->line_control;
827 status = priv->current_status;
828 spin_unlock_irqrestore(&priv->lock, flags);
829
830 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
831 | ((control & CONTROL_RTS) ? TIOCM_RTS : 0)
832 | ((status & UART_CTS) ? TIOCM_CTS : 0)
833 | ((status & UART_DSR) ? TIOCM_DSR : 0)
834 | ((status & UART_RI) ? TIOCM_RI : 0)
835 | ((status & UART_CD) ? TIOCM_CD : 0);
836
837 dev_dbg(&port->dev, "%s - result = %x\n", __func__, result);
838
839 return result;
840 }
841
842
843 static int cypress_tiocmset(struct tty_struct *tty,
844 unsigned int set, unsigned int clear)
845 {
846 struct usb_serial_port *port = tty->driver_data;
847 struct cypress_private *priv = usb_get_serial_port_data(port);
848 unsigned long flags;
849
850 spin_lock_irqsave(&priv->lock, flags);
851 if (set & TIOCM_RTS)
852 priv->line_control |= CONTROL_RTS;
853 if (set & TIOCM_DTR)
854 priv->line_control |= CONTROL_DTR;
855 if (clear & TIOCM_RTS)
856 priv->line_control &= ~CONTROL_RTS;
857 if (clear & TIOCM_DTR)
858 priv->line_control &= ~CONTROL_DTR;
859 priv->cmd_ctrl = 1;
860 spin_unlock_irqrestore(&priv->lock, flags);
861
862 return cypress_write(tty, port, NULL, 0);
863 }
864
865
866 static int cypress_tiocmiwait(struct tty_struct *tty, unsigned long arg)
867 {
868 struct usb_serial_port *port = tty->driver_data;
869 struct cypress_private *priv = usb_get_serial_port_data(port);
870 char diff;
871
872 for (;;) {
873 interruptible_sleep_on(&port->port.delta_msr_wait);
874 /* see if a signal did it */
875 if (signal_pending(current))
876 return -ERESTARTSYS;
877
878 if (port->serial->disconnected)
879 return -EIO;
880
881 diff = priv->diff_status;
882 if (diff == 0)
883 return -EIO; /* no change => error */
884
885 /* consume all events */
886 priv->diff_status = 0;
887
888 /* return 0 if caller wanted to know about
889 these bits */
890 if (((arg & TIOCM_RNG) && (diff & UART_RI)) ||
891 ((arg & TIOCM_DSR) && (diff & UART_DSR)) ||
892 ((arg & TIOCM_CD) && (diff & UART_CD)) ||
893 ((arg & TIOCM_CTS) && (diff & UART_CTS)))
894 return 0;
895 /* otherwise caller can't care less about what
896 * happened, and so we continue to wait for
897 * more events.
898 */
899 }
900
901 return 0;
902 }
903
904 static void cypress_set_termios(struct tty_struct *tty,
905 struct usb_serial_port *port, struct ktermios *old_termios)
906 {
907 struct cypress_private *priv = usb_get_serial_port_data(port);
908 struct device *dev = &port->dev;
909 int data_bits, stop_bits, parity_type, parity_enable;
910 unsigned cflag, iflag;
911 unsigned long flags;
912 __u8 oldlines;
913 int linechange = 0;
914
915 spin_lock_irqsave(&priv->lock, flags);
916 /* We can't clean this one up as we don't know the device type
917 early enough */
918 if (!priv->termios_initialized) {
919 if (priv->chiptype == CT_EARTHMATE) {
920 tty->termios = tty_std_termios;
921 tty->termios.c_cflag = B4800 | CS8 | CREAD | HUPCL |
922 CLOCAL;
923 tty->termios.c_ispeed = 4800;
924 tty->termios.c_ospeed = 4800;
925 } else if (priv->chiptype == CT_CYPHIDCOM) {
926 tty->termios = tty_std_termios;
927 tty->termios.c_cflag = B9600 | CS8 | CREAD | HUPCL |
928 CLOCAL;
929 tty->termios.c_ispeed = 9600;
930 tty->termios.c_ospeed = 9600;
931 } else if (priv->chiptype == CT_CA42V2) {
932 tty->termios = tty_std_termios;
933 tty->termios.c_cflag = B9600 | CS8 | CREAD | HUPCL |
934 CLOCAL;
935 tty->termios.c_ispeed = 9600;
936 tty->termios.c_ospeed = 9600;
937 }
938 priv->termios_initialized = 1;
939 }
940 spin_unlock_irqrestore(&priv->lock, flags);
941
942 /* Unsupported features need clearing */
943 tty->termios.c_cflag &= ~(CMSPAR|CRTSCTS);
944
945 cflag = tty->termios.c_cflag;
946 iflag = tty->termios.c_iflag;
947
948 /* check if there are new settings */
949 if (old_termios) {
950 spin_lock_irqsave(&priv->lock, flags);
951 priv->tmp_termios = tty->termios;
952 spin_unlock_irqrestore(&priv->lock, flags);
953 }
954
955 /* set number of data bits, parity, stop bits */
956 /* when parity is disabled the parity type bit is ignored */
957
958 /* 1 means 2 stop bits, 0 means 1 stop bit */
959 stop_bits = cflag & CSTOPB ? 1 : 0;
960
961 if (cflag & PARENB) {
962 parity_enable = 1;
963 /* 1 means odd parity, 0 means even parity */
964 parity_type = cflag & PARODD ? 1 : 0;
965 } else
966 parity_enable = parity_type = 0;
967
968 switch (cflag & CSIZE) {
969 case CS5:
970 data_bits = 0;
971 break;
972 case CS6:
973 data_bits = 1;
974 break;
975 case CS7:
976 data_bits = 2;
977 break;
978 case CS8:
979 data_bits = 3;
980 break;
981 default:
982 dev_err(dev, "%s - CSIZE was set, but not CS5-CS8\n", __func__);
983 data_bits = 3;
984 }
985 spin_lock_irqsave(&priv->lock, flags);
986 oldlines = priv->line_control;
987 if ((cflag & CBAUD) == B0) {
988 /* drop dtr and rts */
989 dev_dbg(dev, "%s - dropping the lines, baud rate 0bps\n", __func__);
990 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
991 } else
992 priv->line_control = (CONTROL_DTR | CONTROL_RTS);
993 spin_unlock_irqrestore(&priv->lock, flags);
994
995 dev_dbg(dev, "%s - sending %d stop_bits, %d parity_enable, %d parity_type, %d data_bits (+5)\n",
996 __func__, stop_bits, parity_enable, parity_type, data_bits);
997
998 cypress_serial_control(tty, port, tty_get_baud_rate(tty),
999 data_bits, stop_bits,
1000 parity_enable, parity_type,
1001 0, CYPRESS_SET_CONFIG);
1002
1003 /* we perform a CYPRESS_GET_CONFIG so that the current settings are
1004 * filled into the private structure this should confirm that all is
1005 * working if it returns what we just set */
1006 cypress_serial_control(tty, port, 0, 0, 0, 0, 0, 0, CYPRESS_GET_CONFIG);
1007
1008 /* Here we can define custom tty settings for devices; the main tty
1009 * termios flag base comes from empeg.c */
1010
1011 spin_lock_irqsave(&priv->lock, flags);
1012 if (priv->chiptype == CT_EARTHMATE && priv->baud_rate == 4800) {
1013 dev_dbg(dev, "Using custom termios settings for a baud rate of 4800bps.\n");
1014 /* define custom termios settings for NMEA protocol */
1015
1016 tty->termios.c_iflag /* input modes - */
1017 &= ~(IGNBRK /* disable ignore break */
1018 | BRKINT /* disable break causes interrupt */
1019 | PARMRK /* disable mark parity errors */
1020 | ISTRIP /* disable clear high bit of input char */
1021 | INLCR /* disable translate NL to CR */
1022 | IGNCR /* disable ignore CR */
1023 | ICRNL /* disable translate CR to NL */
1024 | IXON); /* disable enable XON/XOFF flow control */
1025
1026 tty->termios.c_oflag /* output modes */
1027 &= ~OPOST; /* disable postprocess output char */
1028
1029 tty->termios.c_lflag /* line discipline modes */
1030 &= ~(ECHO /* disable echo input characters */
1031 | ECHONL /* disable echo new line */
1032 | ICANON /* disable erase, kill, werase, and rprnt
1033 special characters */
1034 | ISIG /* disable interrupt, quit, and suspend
1035 special characters */
1036 | IEXTEN); /* disable non-POSIX special characters */
1037 } /* CT_CYPHIDCOM: Application should handle this for device */
1038
1039 linechange = (priv->line_control != oldlines);
1040 spin_unlock_irqrestore(&priv->lock, flags);
1041
1042 /* if necessary, set lines */
1043 if (linechange) {
1044 priv->cmd_ctrl = 1;
1045 cypress_write(tty, port, NULL, 0);
1046 }
1047 } /* cypress_set_termios */
1048
1049
1050 /* returns amount of data still left in soft buffer */
1051 static int cypress_chars_in_buffer(struct tty_struct *tty)
1052 {
1053 struct usb_serial_port *port = tty->driver_data;
1054 struct cypress_private *priv = usb_get_serial_port_data(port);
1055 int chars = 0;
1056 unsigned long flags;
1057
1058 spin_lock_irqsave(&priv->lock, flags);
1059 chars = kfifo_len(&priv->write_fifo);
1060 spin_unlock_irqrestore(&priv->lock, flags);
1061
1062 dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
1063 return chars;
1064 }
1065
1066
1067 static void cypress_throttle(struct tty_struct *tty)
1068 {
1069 struct usb_serial_port *port = tty->driver_data;
1070 struct cypress_private *priv = usb_get_serial_port_data(port);
1071
1072 spin_lock_irq(&priv->lock);
1073 priv->rx_flags = THROTTLED;
1074 spin_unlock_irq(&priv->lock);
1075 }
1076
1077
1078 static void cypress_unthrottle(struct tty_struct *tty)
1079 {
1080 struct usb_serial_port *port = tty->driver_data;
1081 struct cypress_private *priv = usb_get_serial_port_data(port);
1082 int actually_throttled, result;
1083
1084 spin_lock_irq(&priv->lock);
1085 actually_throttled = priv->rx_flags & ACTUALLY_THROTTLED;
1086 priv->rx_flags = 0;
1087 spin_unlock_irq(&priv->lock);
1088
1089 if (!priv->comm_is_ok)
1090 return;
1091
1092 if (actually_throttled) {
1093 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
1094 if (result) {
1095 dev_err(&port->dev, "%s - failed submitting read urb, "
1096 "error %d\n", __func__, result);
1097 cypress_set_dead(port);
1098 }
1099 }
1100 }
1101
1102
1103 static void cypress_read_int_callback(struct urb *urb)
1104 {
1105 struct usb_serial_port *port = urb->context;
1106 struct cypress_private *priv = usb_get_serial_port_data(port);
1107 struct device *dev = &urb->dev->dev;
1108 struct tty_struct *tty;
1109 unsigned char *data = urb->transfer_buffer;
1110 unsigned long flags;
1111 char tty_flag = TTY_NORMAL;
1112 int havedata = 0;
1113 int bytes = 0;
1114 int result;
1115 int i = 0;
1116 int status = urb->status;
1117
1118 switch (status) {
1119 case 0: /* success */
1120 break;
1121 case -ECONNRESET:
1122 case -ENOENT:
1123 case -ESHUTDOWN:
1124 /* precursor to disconnect so just go away */
1125 return;
1126 case -EPIPE:
1127 /* Can't call usb_clear_halt while in_interrupt */
1128 /* FALLS THROUGH */
1129 default:
1130 /* something ugly is going on... */
1131 dev_err(dev, "%s - unexpected nonzero read status received: %d\n",
1132 __func__, status);
1133 cypress_set_dead(port);
1134 return;
1135 }
1136
1137 spin_lock_irqsave(&priv->lock, flags);
1138 if (priv->rx_flags & THROTTLED) {
1139 dev_dbg(dev, "%s - now throttling\n", __func__);
1140 priv->rx_flags |= ACTUALLY_THROTTLED;
1141 spin_unlock_irqrestore(&priv->lock, flags);
1142 return;
1143 }
1144 spin_unlock_irqrestore(&priv->lock, flags);
1145
1146 tty = tty_port_tty_get(&port->port);
1147 if (!tty) {
1148 dev_dbg(dev, "%s - bad tty pointer - exiting\n", __func__);
1149 return;
1150 }
1151
1152 spin_lock_irqsave(&priv->lock, flags);
1153 result = urb->actual_length;
1154 switch (priv->pkt_fmt) {
1155 default:
1156 case packet_format_1:
1157 /* This is for the CY7C64013... */
1158 priv->current_status = data[0] & 0xF8;
1159 bytes = data[1] + 2;
1160 i = 2;
1161 if (bytes > 2)
1162 havedata = 1;
1163 break;
1164 case packet_format_2:
1165 /* This is for the CY7C63743... */
1166 priv->current_status = data[0] & 0xF8;
1167 bytes = (data[0] & 0x07) + 1;
1168 i = 1;
1169 if (bytes > 1)
1170 havedata = 1;
1171 break;
1172 }
1173 spin_unlock_irqrestore(&priv->lock, flags);
1174 if (result < bytes) {
1175 dev_dbg(dev,
1176 "%s - wrong packet size - received %d bytes but packet said %d bytes\n",
1177 __func__, result, bytes);
1178 goto continue_read;
1179 }
1180
1181 usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
1182
1183 spin_lock_irqsave(&priv->lock, flags);
1184 /* check to see if status has changed */
1185 if (priv->current_status != priv->prev_status) {
1186 priv->diff_status |= priv->current_status ^
1187 priv->prev_status;
1188 wake_up_interruptible(&port->port.delta_msr_wait);
1189 priv->prev_status = priv->current_status;
1190 }
1191 spin_unlock_irqrestore(&priv->lock, flags);
1192
1193 /* hangup, as defined in acm.c... this might be a bad place for it
1194 * though */
1195 if (tty && !(tty->termios.c_cflag & CLOCAL) &&
1196 !(priv->current_status & UART_CD)) {
1197 dev_dbg(dev, "%s - calling hangup\n", __func__);
1198 tty_hangup(tty);
1199 goto continue_read;
1200 }
1201
1202 /* There is one error bit... I'm assuming it is a parity error
1203 * indicator as the generic firmware will set this bit to 1 if a
1204 * parity error occurs.
1205 * I can not find reference to any other error events. */
1206 spin_lock_irqsave(&priv->lock, flags);
1207 if (priv->current_status & CYP_ERROR) {
1208 spin_unlock_irqrestore(&priv->lock, flags);
1209 tty_flag = TTY_PARITY;
1210 dev_dbg(dev, "%s - Parity Error detected\n", __func__);
1211 } else
1212 spin_unlock_irqrestore(&priv->lock, flags);
1213
1214 /* process read if there is data other than line status */
1215 if (bytes > i) {
1216 tty_insert_flip_string_fixed_flag(&port->port, data + i,
1217 tty_flag, bytes - i);
1218 tty_flip_buffer_push(&port->port);
1219 }
1220
1221 spin_lock_irqsave(&priv->lock, flags);
1222 /* control and status byte(s) are also counted */
1223 priv->bytes_in += bytes;
1224 spin_unlock_irqrestore(&priv->lock, flags);
1225
1226 continue_read:
1227 tty_kref_put(tty);
1228
1229 /* Continue trying to always read */
1230
1231 if (priv->comm_is_ok) {
1232 usb_fill_int_urb(port->interrupt_in_urb, port->serial->dev,
1233 usb_rcvintpipe(port->serial->dev,
1234 port->interrupt_in_endpointAddress),
1235 port->interrupt_in_urb->transfer_buffer,
1236 port->interrupt_in_urb->transfer_buffer_length,
1237 cypress_read_int_callback, port,
1238 priv->read_urb_interval);
1239 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
1240 if (result && result != -EPERM) {
1241 dev_err(dev, "%s - failed resubmitting read urb, error %d\n",
1242 __func__, result);
1243 cypress_set_dead(port);
1244 }
1245 }
1246 } /* cypress_read_int_callback */
1247
1248
1249 static void cypress_write_int_callback(struct urb *urb)
1250 {
1251 struct usb_serial_port *port = urb->context;
1252 struct cypress_private *priv = usb_get_serial_port_data(port);
1253 struct device *dev = &urb->dev->dev;
1254 int result;
1255 int status = urb->status;
1256
1257 switch (status) {
1258 case 0:
1259 /* success */
1260 break;
1261 case -ECONNRESET:
1262 case -ENOENT:
1263 case -ESHUTDOWN:
1264 /* this urb is terminated, clean up */
1265 dev_dbg(dev, "%s - urb shutting down with status: %d\n",
1266 __func__, status);
1267 priv->write_urb_in_use = 0;
1268 return;
1269 case -EPIPE: /* no break needed; clear halt and resubmit */
1270 if (!priv->comm_is_ok)
1271 break;
1272 usb_clear_halt(port->serial->dev, 0x02);
1273 /* error in the urb, so we have to resubmit it */
1274 dev_dbg(dev, "%s - nonzero write bulk status received: %d\n",
1275 __func__, status);
1276 port->interrupt_out_urb->transfer_buffer_length = 1;
1277 result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC);
1278 if (!result)
1279 return;
1280 dev_err(dev, "%s - failed resubmitting write urb, error %d\n",
1281 __func__, result);
1282 cypress_set_dead(port);
1283 break;
1284 default:
1285 dev_err(dev, "%s - unexpected nonzero write status received: %d\n",
1286 __func__, status);
1287 cypress_set_dead(port);
1288 break;
1289 }
1290 priv->write_urb_in_use = 0;
1291
1292 /* send any buffered data */
1293 cypress_send(port);
1294 }
1295
1296 module_usb_serial_driver(serial_drivers, id_table_combined);
1297
1298 MODULE_AUTHOR(DRIVER_AUTHOR);
1299 MODULE_DESCRIPTION(DRIVER_DESC);
1300 MODULE_LICENSE("GPL");
1301
1302 module_param(stats, bool, S_IRUGO | S_IWUSR);
1303 MODULE_PARM_DESC(stats, "Enable statistics or not");
1304 module_param(interval, int, S_IRUGO | S_IWUSR);
1305 MODULE_PARM_DESC(interval, "Overrides interrupt interval");
1306 module_param(unstable_bauds, bool, S_IRUGO | S_IWUSR);
1307 MODULE_PARM_DESC(unstable_bauds, "Allow unstable baud rates");
CRIS linux kernel tree