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