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