projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge branch 'zynq/core-smp' of git://git.xilinx.com/linux-xlnx into next/soc2
[GitHub/mt8127/android_kernel_alcatel_ttab.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 #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 { } /* Terminating entry */
69 };
70
71 static const struct usb_device_id id_table_nokiaca42v2[] = {
72 { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
73 { } /* Terminating entry */
74 };
75
76 static const struct usb_device_id id_table_combined[] = {
77 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
78 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
79 { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
80 { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) },
81 { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
82 { } /* Terminating entry */
83 };
84
85 MODULE_DEVICE_TABLE(usb, id_table_combined);
86
87 enum packet_format {
88 packet_format_1, /* b0:status, b1:payload count */
89 packet_format_2 /* b0[7:3]:status, b0[2:0]:payload count */
90 };
91
92 struct cypress_private {
93 spinlock_t lock; /* private lock */
94 int chiptype; /* identifier of device, for quirks/etc */
95 int bytes_in; /* used for statistics */
96 int bytes_out; /* used for statistics */
97 int cmd_count; /* used for statistics */
98 int cmd_ctrl; /* always set this to 1 before issuing a command */
99 struct kfifo write_fifo; /* write fifo */
100 int write_urb_in_use; /* write urb in use indicator */
101 int write_urb_interval; /* interval to use for write urb */
102 int read_urb_interval; /* interval to use for read urb */
103 int comm_is_ok; /* true if communication is (still) ok */
104 int termios_initialized;
105 __u8 line_control; /* holds dtr / rts value */
106 __u8 current_status; /* received from last read - info on dsr,cts,cd,ri,etc */
107 __u8 current_config; /* stores the current configuration byte */
108 __u8 rx_flags; /* throttling - used from whiteheat/ftdi_sio */
109 enum packet_format pkt_fmt; /* format to use for packet send / receive */
110 int get_cfg_unsafe; /* If true, the CYPRESS_GET_CONFIG is unsafe */
111 int baud_rate; /* stores current baud rate in
112 integer form */
113 int isthrottled; /* if throttled, discard reads */
114 char prev_status, diff_status; /* used for TIOCMIWAIT */
115 /* we pass a pointer to this as the argument sent to
116 cypress_set_termios old_termios */
117 struct ktermios tmp_termios; /* stores the old termios settings */
118 };
119
120 /* function prototypes for the Cypress USB to serial device */
121 static int cypress_earthmate_port_probe(struct usb_serial_port *port);
122 static int cypress_hidcom_port_probe(struct usb_serial_port *port);
123 static int cypress_ca42v2_port_probe(struct usb_serial_port *port);
124 static int cypress_port_remove(struct usb_serial_port *port);
125 static int cypress_open(struct tty_struct *tty, struct usb_serial_port *port);
126 static void cypress_close(struct usb_serial_port *port);
127 static void cypress_dtr_rts(struct usb_serial_port *port, int on);
128 static int cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
129 const unsigned char *buf, int count);
130 static void cypress_send(struct usb_serial_port *port);
131 static int cypress_write_room(struct tty_struct *tty);
132 static int cypress_ioctl(struct tty_struct *tty,
133 unsigned int cmd, unsigned long arg);
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_chars_in_buffer(struct tty_struct *tty);
140 static void cypress_throttle(struct tty_struct *tty);
141 static void cypress_unthrottle(struct tty_struct *tty);
142 static void cypress_set_dead(struct usb_serial_port *port);
143 static void cypress_read_int_callback(struct urb *urb);
144 static void cypress_write_int_callback(struct urb *urb);
145
146 static struct usb_serial_driver cypress_earthmate_device = {
147 .driver = {
148 .owner = THIS_MODULE,
149 .name = "earthmate",
150 },
151 .description = "DeLorme Earthmate USB",
152 .id_table = id_table_earthmate,
153 .num_ports = 1,
154 .port_probe = cypress_earthmate_port_probe,
155 .port_remove = cypress_port_remove,
156 .open = cypress_open,
157 .close = cypress_close,
158 .dtr_rts = cypress_dtr_rts,
159 .write = cypress_write,
160 .write_room = cypress_write_room,
161 .ioctl = cypress_ioctl,
162 .set_termios = cypress_set_termios,
163 .tiocmget = cypress_tiocmget,
164 .tiocmset = cypress_tiocmset,
165 .chars_in_buffer = cypress_chars_in_buffer,
166 .throttle = cypress_throttle,
167 .unthrottle = cypress_unthrottle,
168 .read_int_callback = cypress_read_int_callback,
169 .write_int_callback = cypress_write_int_callback,
170 };
171
172 static struct usb_serial_driver cypress_hidcom_device = {
173 .driver = {
174 .owner = THIS_MODULE,
175 .name = "cyphidcom",
176 },
177 .description = "HID->COM RS232 Adapter",
178 .id_table = id_table_cyphidcomrs232,
179 .num_ports = 1,
180 .port_probe = cypress_hidcom_port_probe,
181 .port_remove = cypress_port_remove,
182 .open = cypress_open,
183 .close = cypress_close,
184 .dtr_rts = cypress_dtr_rts,
185 .write = cypress_write,
186 .write_room = cypress_write_room,
187 .ioctl = cypress_ioctl,
188 .set_termios = cypress_set_termios,
189 .tiocmget = cypress_tiocmget,
190 .tiocmset = cypress_tiocmset,
191 .chars_in_buffer = cypress_chars_in_buffer,
192 .throttle = cypress_throttle,
193 .unthrottle = cypress_unthrottle,
194 .read_int_callback = cypress_read_int_callback,
195 .write_int_callback = cypress_write_int_callback,
196 };
197
198 static struct usb_serial_driver cypress_ca42v2_device = {
199 .driver = {
200 .owner = THIS_MODULE,
201 .name = "nokiaca42v2",
202 },
203 .description = "Nokia CA-42 V2 Adapter",
204 .id_table = id_table_nokiaca42v2,
205 .num_ports = 1,
206 .port_probe = cypress_ca42v2_port_probe,
207 .port_remove = cypress_port_remove,
208 .open = cypress_open,
209 .close = cypress_close,
210 .dtr_rts = cypress_dtr_rts,
211 .write = cypress_write,
212 .write_room = cypress_write_room,
213 .ioctl = cypress_ioctl,
214 .set_termios = cypress_set_termios,
215 .tiocmget = cypress_tiocmget,
216 .tiocmset = cypress_tiocmset,
217 .chars_in_buffer = cypress_chars_in_buffer,
218 .throttle = cypress_throttle,
219 .unthrottle = cypress_unthrottle,
220 .read_int_callback = cypress_read_int_callback,
221 .write_int_callback = cypress_write_int_callback,
222 };
223
224 static struct usb_serial_driver * const serial_drivers[] = {
225 &cypress_earthmate_device, &cypress_hidcom_device,
226 &cypress_ca42v2_device, NULL
227 };
228
229 /*****************************************************************************
230 * Cypress serial helper functions
231 *****************************************************************************/
232
233
234 static int analyze_baud_rate(struct usb_serial_port *port, speed_t new_rate)
235 {
236 struct cypress_private *priv;
237 priv = usb_get_serial_port_data(port);
238
239 if (unstable_bauds)
240 return new_rate;
241
242 /*
243 * The general purpose firmware for the Cypress M8 allows for
244 * a maximum speed of 57600bps (I have no idea whether DeLorme
245 * chose to use the general purpose firmware or not), if you
246 * need to modify this speed setting for your own project
247 * please add your own chiptype and modify the code likewise.
248 * The Cypress HID->COM device will work successfully up to
249 * 115200bps (but the actual throughput is around 3kBps).
250 */
251 if (port->serial->dev->speed == USB_SPEED_LOW) {
252 /*
253 * Mike Isely <isely@pobox.com> 2-Feb-2008: The
254 * Cypress app note that describes this mechanism
255 * states the the low-speed part can't handle more
256 * than 800 bytes/sec, in which case 4800 baud is the
257 * safest speed for a part like that.
258 */
259 if (new_rate > 4800) {
260 dev_dbg(&port->dev,
261 "%s - failed setting baud rate, device incapable speed %d\n",
262 __func__, new_rate);
263 return -1;
264 }
265 }
266 switch (priv->chiptype) {
267 case CT_EARTHMATE:
268 if (new_rate <= 600) {
269 /* 300 and 600 baud rates are supported under
270 * the generic firmware, but are not used with
271 * NMEA and SiRF protocols */
272 dev_dbg(&port->dev,
273 "%s - failed setting baud rate, unsupported speed of %d on Earthmate GPS",
274 __func__, new_rate);
275 return -1;
276 }
277 break;
278 default:
279 break;
280 }
281 return new_rate;
282 }
283
284
285 /* This function can either set or retrieve the current serial line settings */
286 static int cypress_serial_control(struct tty_struct *tty,
287 struct usb_serial_port *port, speed_t baud_rate, int data_bits,
288 int stop_bits, int parity_enable, int parity_type, int reset,
289 int cypress_request_type)
290 {
291 int new_baudrate = 0, retval = 0, tries = 0;
292 struct cypress_private *priv;
293 struct device *dev = &port->dev;
294 u8 *feature_buffer;
295 const unsigned int feature_len = 5;
296 unsigned long flags;
297
298 priv = usb_get_serial_port_data(port);
299
300 if (!priv->comm_is_ok)
301 return -ENODEV;
302
303 feature_buffer = kcalloc(feature_len, sizeof(u8), GFP_KERNEL);
304 if (!feature_buffer)
305 return -ENOMEM;
306
307 switch (cypress_request_type) {
308 case CYPRESS_SET_CONFIG:
309 /* 0 means 'Hang up' so doesn't change the true bit rate */
310 new_baudrate = priv->baud_rate;
311 if (baud_rate && baud_rate != priv->baud_rate) {
312 dev_dbg(dev, "%s - baud rate is changing\n", __func__);
313 retval = analyze_baud_rate(port, baud_rate);
314 if (retval >= 0) {
315 new_baudrate = retval;
316 dev_dbg(dev, "%s - New baud rate set to %d\n",
317 __func__, new_baudrate);
318 }
319 }
320 dev_dbg(dev, "%s - baud rate is being sent as %d\n", __func__,
321 new_baudrate);
322
323 /* fill the feature_buffer with new configuration */
324 put_unaligned_le32(new_baudrate, feature_buffer);
325 feature_buffer[4] |= data_bits; /* assign data bits in 2 bit space ( max 3 ) */
326 /* 1 bit gap */
327 feature_buffer[4] |= (stop_bits << 3); /* assign stop bits in 1 bit space */
328 feature_buffer[4] |= (parity_enable << 4); /* assign parity flag in 1 bit space */
329 feature_buffer[4] |= (parity_type << 5); /* assign parity type in 1 bit space */
330 /* 1 bit gap */
331 feature_buffer[4] |= (reset << 7); /* assign reset at end of byte, 1 bit space */
332
333 dev_dbg(dev, "%s - device is being sent this feature report:\n", __func__);
334 dev_dbg(dev, "%s - %02X - %02X - %02X - %02X - %02X\n", __func__,
335 feature_buffer[0], feature_buffer[1],
336 feature_buffer[2], feature_buffer[3],
337 feature_buffer[4]);
338
339 do {
340 retval = usb_control_msg(port->serial->dev,
341 usb_sndctrlpipe(port->serial->dev, 0),
342 HID_REQ_SET_REPORT,
343 USB_DIR_OUT | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
344 0x0300, 0, feature_buffer,
345 feature_len, 500);
346
347 if (tries++ >= 3)
348 break;
349
350 } while (retval != feature_len &&
351 retval != -ENODEV);
352
353 if (retval != feature_len) {
354 dev_err(dev, "%s - failed sending serial line settings - %d\n",
355 __func__, retval);
356 cypress_set_dead(port);
357 } else {
358 spin_lock_irqsave(&priv->lock, flags);
359 priv->baud_rate = new_baudrate;
360 priv->current_config = feature_buffer[4];
361 spin_unlock_irqrestore(&priv->lock, flags);
362 /* If we asked for a speed change encode it */
363 if (baud_rate)
364 tty_encode_baud_rate(tty,
365 new_baudrate, new_baudrate);
366 }
367 break;
368 case CYPRESS_GET_CONFIG:
369 if (priv->get_cfg_unsafe) {
370 /* Not implemented for this device,
371 and if we try to do it we're likely
372 to crash the hardware. */
373 retval = -ENOTTY;
374 goto out;
375 }
376 dev_dbg(dev, "%s - retreiving serial line settings\n", __func__);
377 do {
378 retval = usb_control_msg(port->serial->dev,
379 usb_rcvctrlpipe(port->serial->dev, 0),
380 HID_REQ_GET_REPORT,
381 USB_DIR_IN | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
382 0x0300, 0, feature_buffer,
383 feature_len, 500);
384
385 if (tries++ >= 3)
386 break;
387 } while (retval != feature_len
388 && retval != -ENODEV);
389
390 if (retval != feature_len) {
391 dev_err(dev, "%s - failed to retrieve serial line settings - %d\n",
392 __func__, retval);
393 cypress_set_dead(port);
394 goto out;
395 } else {
396 spin_lock_irqsave(&priv->lock, flags);
397 /* store the config in one byte, and later
398 use bit masks to check values */
399 priv->current_config = feature_buffer[4];
400 priv->baud_rate = get_unaligned_le32(feature_buffer);
401 spin_unlock_irqrestore(&priv->lock, flags);
402 }
403 }
404 spin_lock_irqsave(&priv->lock, flags);
405 ++priv->cmd_count;
406 spin_unlock_irqrestore(&priv->lock, flags);
407 out:
408 kfree(feature_buffer);
409 return retval;
410 } /* cypress_serial_control */
411
412
413 static void cypress_set_dead(struct usb_serial_port *port)
414 {
415 struct cypress_private *priv = usb_get_serial_port_data(port);
416 unsigned long flags;
417
418 spin_lock_irqsave(&priv->lock, flags);
419 if (!priv->comm_is_ok) {
420 spin_unlock_irqrestore(&priv->lock, flags);
421 return;
422 }
423 priv->comm_is_ok = 0;
424 spin_unlock_irqrestore(&priv->lock, flags);
425
426 dev_err(&port->dev, "cypress_m8 suspending failing port %d - "
427 "interval might be too short\n", port->number);
428 }
429
430
431 /*****************************************************************************
432 * Cypress serial driver functions
433 *****************************************************************************/
434
435
436 static int cypress_generic_port_probe(struct usb_serial_port *port)
437 {
438 struct usb_serial *serial = port->serial;
439 struct cypress_private *priv;
440
441 priv = kzalloc(sizeof(struct cypress_private), GFP_KERNEL);
442 if (!priv)
443 return -ENOMEM;
444
445 priv->comm_is_ok = !0;
446 spin_lock_init(&priv->lock);
447 if (kfifo_alloc(&priv->write_fifo, CYPRESS_BUF_SIZE, GFP_KERNEL)) {
448 kfree(priv);
449 return -ENOMEM;
450 }
451
452 usb_reset_configuration(serial->dev);
453
454 priv->cmd_ctrl = 0;
455 priv->line_control = 0;
456 priv->termios_initialized = 0;
457 priv->rx_flags = 0;
458 /* Default packet format setting is determined by packet size.
459 Anything with a size larger then 9 must have a separate
460 count field since the 3 bit count field is otherwise too
461 small. Otherwise we can use the slightly more compact
462 format. This is in accordance with the cypress_m8 serial
463 converter app note. */
464 if (port->interrupt_out_size > 9)
465 priv->pkt_fmt = packet_format_1;
466 else
467 priv->pkt_fmt = packet_format_2;
468
469 if (interval > 0) {
470 priv->write_urb_interval = interval;
471 priv->read_urb_interval = interval;
472 dev_dbg(&port->dev, "%s - read & write intervals forced to %d\n",
473 __func__, interval);
474 } else {
475 priv->write_urb_interval = port->interrupt_out_urb->interval;
476 priv->read_urb_interval = port->interrupt_in_urb->interval;
477 dev_dbg(&port->dev, "%s - intervals: read=%d write=%d\n",
478 __func__, priv->read_urb_interval,
479 priv->write_urb_interval);
480 }
481 usb_set_serial_port_data(port, priv);
482
483 return 0;
484 }
485
486
487 static int cypress_earthmate_port_probe(struct usb_serial_port *port)
488 {
489 struct usb_serial *serial = port->serial;
490 struct cypress_private *priv;
491 int ret;
492
493 ret = cypress_generic_port_probe(port);
494 if (ret) {
495 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
496 return ret;
497 }
498
499 priv = usb_get_serial_port_data(port);
500 priv->chiptype = CT_EARTHMATE;
501 /* All Earthmate devices use the separated-count packet
502 format! Idiotic. */
503 priv->pkt_fmt = packet_format_1;
504 if (serial->dev->descriptor.idProduct !=
505 cpu_to_le16(PRODUCT_ID_EARTHMATEUSB)) {
506 /* The old original USB Earthmate seemed able to
507 handle GET_CONFIG requests; everything they've
508 produced since that time crashes if this command is
509 attempted :-( */
510 dev_dbg(&port->dev,
511 "%s - Marking this device as unsafe for GET_CONFIG commands\n",
512 __func__);
513 priv->get_cfg_unsafe = !0;
514 }
515
516 return 0;
517 }
518
519 static int cypress_hidcom_port_probe(struct usb_serial_port *port)
520 {
521 struct cypress_private *priv;
522 int ret;
523
524 ret = cypress_generic_port_probe(port);
525 if (ret) {
526 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
527 return ret;
528 }
529
530 priv = usb_get_serial_port_data(port);
531 priv->chiptype = CT_CYPHIDCOM;
532
533 return 0;
534 }
535
536 static int cypress_ca42v2_port_probe(struct usb_serial_port *port)
537 {
538 struct cypress_private *priv;
539 int ret;
540
541 ret = cypress_generic_port_probe(port);
542 if (ret) {
543 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
544 return ret;
545 }
546
547 priv = usb_get_serial_port_data(port);
548 priv->chiptype = CT_CA42V2;
549
550 return 0;
551 }
552
553 static int cypress_port_remove(struct usb_serial_port *port)
554 {
555 struct cypress_private *priv;
556
557 priv = usb_get_serial_port_data(port);
558
559 kfifo_free(&priv->write_fifo);
560 kfree(priv);
561
562 return 0;
563 }
564
565 static int cypress_open(struct tty_struct *tty, struct usb_serial_port *port)
566 {
567 struct cypress_private *priv = usb_get_serial_port_data(port);
568 struct usb_serial *serial = port->serial;
569 unsigned long flags;
570 int result = 0;
571
572 if (!priv->comm_is_ok)
573 return -EIO;
574
575 /* clear halts before open */
576 usb_clear_halt(serial->dev, 0x81);
577 usb_clear_halt(serial->dev, 0x02);
578
579 spin_lock_irqsave(&priv->lock, flags);
580 /* reset read/write statistics */
581 priv->bytes_in = 0;
582 priv->bytes_out = 0;
583 priv->cmd_count = 0;
584 priv->rx_flags = 0;
585 spin_unlock_irqrestore(&priv->lock, flags);
586
587 /* Set termios */
588 cypress_send(port);
589
590 if (tty)
591 cypress_set_termios(tty, port, &priv->tmp_termios);
592
593 /* setup the port and start reading from the device */
594 if (!port->interrupt_in_urb) {
595 dev_err(&port->dev, "%s - interrupt_in_urb is empty!\n",
596 __func__);
597 return -1;
598 }
599
600 usb_fill_int_urb(port->interrupt_in_urb, serial->dev,
601 usb_rcvintpipe(serial->dev, port->interrupt_in_endpointAddress),
602 port->interrupt_in_urb->transfer_buffer,
603 port->interrupt_in_urb->transfer_buffer_length,
604 cypress_read_int_callback, port, priv->read_urb_interval);
605 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
606
607 if (result) {
608 dev_err(&port->dev,
609 "%s - failed submitting read urb, error %d\n",
610 __func__, result);
611 cypress_set_dead(port);
612 }
613 port->port.drain_delay = 256;
614 return result;
615 } /* cypress_open */
616
617 static void cypress_dtr_rts(struct usb_serial_port *port, int on)
618 {
619 struct cypress_private *priv = usb_get_serial_port_data(port);
620 /* drop dtr and rts */
621 spin_lock_irq(&priv->lock);
622 if (on == 0)
623 priv->line_control = 0;
624 else
625 priv->line_control = CONTROL_DTR | CONTROL_RTS;
626 priv->cmd_ctrl = 1;
627 spin_unlock_irq(&priv->lock);
628 cypress_write(NULL, port, NULL, 0);
629 }
630
631 static void cypress_close(struct usb_serial_port *port)
632 {
633 struct cypress_private *priv = usb_get_serial_port_data(port);
634 unsigned long flags;
635
636 /* writing is potentially harmful, lock must be taken */
637 mutex_lock(&port->serial->disc_mutex);
638 if (port->serial->disconnected) {
639 mutex_unlock(&port->serial->disc_mutex);
640 return;
641 }
642 spin_lock_irqsave(&priv->lock, flags);
643 kfifo_reset_out(&priv->write_fifo);
644 spin_unlock_irqrestore(&priv->lock, flags);
645
646 dev_dbg(&port->dev, "%s - stopping urbs\n", __func__);
647 usb_kill_urb(port->interrupt_in_urb);
648 usb_kill_urb(port->interrupt_out_urb);
649
650 if (stats)
651 dev_info(&port->dev, "Statistics: %d Bytes In | %d Bytes Out | %d Commands Issued\n",
652 priv->bytes_in, priv->bytes_out, priv->cmd_count);
653 mutex_unlock(&port->serial->disc_mutex);
654 } /* cypress_close */
655
656
657 static int cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
658 const unsigned char *buf, int count)
659 {
660 struct cypress_private *priv = usb_get_serial_port_data(port);
661
662 dev_dbg(&port->dev, "%s - port %d, %d bytes\n", __func__, port->number, count);
663
664 /* line control commands, which need to be executed immediately,
665 are not put into the buffer for obvious reasons.
666 */
667 if (priv->cmd_ctrl) {
668 count = 0;
669 goto finish;
670 }
671
672 if (!count)
673 return count;
674
675 count = kfifo_in_locked(&priv->write_fifo, buf, count, &priv->lock);
676
677 finish:
678 cypress_send(port);
679
680 return count;
681 } /* cypress_write */
682
683
684 static void cypress_send(struct usb_serial_port *port)
685 {
686 int count = 0, result, offset, actual_size;
687 struct cypress_private *priv = usb_get_serial_port_data(port);
688 struct device *dev = &port->dev;
689 unsigned long flags;
690
691 if (!priv->comm_is_ok)
692 return;
693
694 dev_dbg(dev, "%s - interrupt out size is %d\n", __func__,
695 port->interrupt_out_size);
696
697 spin_lock_irqsave(&priv->lock, flags);
698 if (priv->write_urb_in_use) {
699 dev_dbg(dev, "%s - can't write, urb in use\n", __func__);
700 spin_unlock_irqrestore(&priv->lock, flags);
701 return;
702 }
703 spin_unlock_irqrestore(&priv->lock, flags);
704
705 /* clear buffer */
706 memset(port->interrupt_out_urb->transfer_buffer, 0,
707 port->interrupt_out_size);
708
709 spin_lock_irqsave(&priv->lock, flags);
710 switch (priv->pkt_fmt) {
711 default:
712 case packet_format_1:
713 /* this is for the CY7C64013... */
714 offset = 2;
715 port->interrupt_out_buffer[0] = priv->line_control;
716 break;
717 case packet_format_2:
718 /* this is for the CY7C63743... */
719 offset = 1;
720 port->interrupt_out_buffer[0] = priv->line_control;
721 break;
722 }
723
724 if (priv->line_control & CONTROL_RESET)
725 priv->line_control &= ~CONTROL_RESET;
726
727 if (priv->cmd_ctrl) {
728 priv->cmd_count++;
729 dev_dbg(dev, "%s - line control command being issued\n", __func__);
730 spin_unlock_irqrestore(&priv->lock, flags);
731 goto send;
732 } else
733 spin_unlock_irqrestore(&priv->lock, flags);
734
735 count = kfifo_out_locked(&priv->write_fifo,
736 &port->interrupt_out_buffer[offset],
737 port->interrupt_out_size - offset,
738 &priv->lock);
739 if (count == 0)
740 return;
741
742 switch (priv->pkt_fmt) {
743 default:
744 case packet_format_1:
745 port->interrupt_out_buffer[1] = count;
746 break;
747 case packet_format_2:
748 port->interrupt_out_buffer[0] |= count;
749 }
750
751 dev_dbg(dev, "%s - count is %d\n", __func__, count);
752
753 send:
754 spin_lock_irqsave(&priv->lock, flags);
755 priv->write_urb_in_use = 1;
756 spin_unlock_irqrestore(&priv->lock, flags);
757
758 if (priv->cmd_ctrl)
759 actual_size = 1;
760 else
761 actual_size = count +
762 (priv->pkt_fmt == packet_format_1 ? 2 : 1);
763
764 usb_serial_debug_data(dev, __func__, port->interrupt_out_size,
765 port->interrupt_out_urb->transfer_buffer);
766
767 usb_fill_int_urb(port->interrupt_out_urb, port->serial->dev,
768 usb_sndintpipe(port->serial->dev, port->interrupt_out_endpointAddress),
769 port->interrupt_out_buffer, port->interrupt_out_size,
770 cypress_write_int_callback, port, priv->write_urb_interval);
771 result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC);
772 if (result) {
773 dev_err_console(port,
774 "%s - failed submitting write urb, error %d\n",
775 __func__, result);
776 priv->write_urb_in_use = 0;
777 cypress_set_dead(port);
778 }
779
780 spin_lock_irqsave(&priv->lock, flags);
781 if (priv->cmd_ctrl)
782 priv->cmd_ctrl = 0;
783
784 /* do not count the line control and size bytes */
785 priv->bytes_out += count;
786 spin_unlock_irqrestore(&priv->lock, flags);
787
788 usb_serial_port_softint(port);
789 } /* cypress_send */
790
791
792 /* returns how much space is available in the soft buffer */
793 static int cypress_write_room(struct tty_struct *tty)
794 {
795 struct usb_serial_port *port = tty->driver_data;
796 struct cypress_private *priv = usb_get_serial_port_data(port);
797 int room = 0;
798 unsigned long flags;
799
800 spin_lock_irqsave(&priv->lock, flags);
801 room = kfifo_avail(&priv->write_fifo);
802 spin_unlock_irqrestore(&priv->lock, flags);
803
804 dev_dbg(&port->dev, "%s - returns %d\n", __func__, room);
805 return room;
806 }
807
808
809 static int cypress_tiocmget(struct tty_struct *tty)
810 {
811 struct usb_serial_port *port = tty->driver_data;
812 struct cypress_private *priv = usb_get_serial_port_data(port);
813 __u8 status, control;
814 unsigned int result = 0;
815 unsigned long flags;
816
817 spin_lock_irqsave(&priv->lock, flags);
818 control = priv->line_control;
819 status = priv->current_status;
820 spin_unlock_irqrestore(&priv->lock, flags);
821
822 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
823 | ((control & CONTROL_RTS) ? TIOCM_RTS : 0)
824 | ((status & UART_CTS) ? TIOCM_CTS : 0)
825 | ((status & UART_DSR) ? TIOCM_DSR : 0)
826 | ((status & UART_RI) ? TIOCM_RI : 0)
827 | ((status & UART_CD) ? TIOCM_CD : 0);
828
829 dev_dbg(&port->dev, "%s - result = %x\n", __func__, result);
830
831 return result;
832 }
833
834
835 static int cypress_tiocmset(struct tty_struct *tty,
836 unsigned int set, unsigned int clear)
837 {
838 struct usb_serial_port *port = tty->driver_data;
839 struct cypress_private *priv = usb_get_serial_port_data(port);
840 unsigned long flags;
841
842 spin_lock_irqsave(&priv->lock, flags);
843 if (set & TIOCM_RTS)
844 priv->line_control |= CONTROL_RTS;
845 if (set & TIOCM_DTR)
846 priv->line_control |= CONTROL_DTR;
847 if (clear & TIOCM_RTS)
848 priv->line_control &= ~CONTROL_RTS;
849 if (clear & TIOCM_DTR)
850 priv->line_control &= ~CONTROL_DTR;
851 priv->cmd_ctrl = 1;
852 spin_unlock_irqrestore(&priv->lock, flags);
853
854 return cypress_write(tty, port, NULL, 0);
855 }
856
857
858 static int cypress_ioctl(struct tty_struct *tty,
859 unsigned int cmd, unsigned long arg)
860 {
861 struct usb_serial_port *port = tty->driver_data;
862 struct cypress_private *priv = usb_get_serial_port_data(port);
863
864 dev_dbg(&port->dev, "%s - port %d, cmd 0x%.4x\n", __func__, port->number, cmd);
865
866 switch (cmd) {
867 /* This code comes from drivers/char/serial.c and ftdi_sio.c */
868 case TIOCMIWAIT:
869 for (;;) {
870 interruptible_sleep_on(&port->delta_msr_wait);
871 /* see if a signal did it */
872 if (signal_pending(current))
873 return -ERESTARTSYS;
874
875 if (port->serial->disconnected)
876 return -EIO;
877
878 {
879 char diff = priv->diff_status;
880 if (diff == 0)
881 return -EIO; /* no change => error */
882
883 /* consume all events */
884 priv->diff_status = 0;
885
886 /* return 0 if caller wanted to know about
887 these bits */
888 if (((arg & TIOCM_RNG) && (diff & UART_RI)) ||
889 ((arg & TIOCM_DSR) && (diff & UART_DSR)) ||
890 ((arg & TIOCM_CD) && (diff & UART_CD)) ||
891 ((arg & TIOCM_CTS) && (diff & UART_CTS)))
892 return 0;
893 /* otherwise caller can't care less about what
894 * happened, and so we continue to wait for
895 * more events.
896 */
897 }
898 }
899 return 0;
900 default:
901 break;
902 }
903 dev_dbg(&port->dev, "%s - arg not supported - it was 0x%04x - check include/asm/ioctls.h\n", __func__, cmd);
904 return -ENOIOCTLCMD;
905 } /* cypress_ioctl */
906
907
908 static void cypress_set_termios(struct tty_struct *tty,
909 struct usb_serial_port *port, struct ktermios *old_termios)
910 {
911 struct cypress_private *priv = usb_get_serial_port_data(port);
912 struct device *dev = &port->dev;
913 int data_bits, stop_bits, parity_type, parity_enable;
914 unsigned cflag, iflag;
915 unsigned long flags;
916 __u8 oldlines;
917 int linechange = 0;
918
919 spin_lock_irqsave(&priv->lock, flags);
920 /* We can't clean this one up as we don't know the device type
921 early enough */
922 if (!priv->termios_initialized) {
923 if (priv->chiptype == CT_EARTHMATE) {
924 tty->termios = tty_std_termios;
925 tty->termios.c_cflag = B4800 | CS8 | CREAD | HUPCL |
926 CLOCAL;
927 tty->termios.c_ispeed = 4800;
928 tty->termios.c_ospeed = 4800;
929 } else if (priv->chiptype == CT_CYPHIDCOM) {
930 tty->termios = tty_std_termios;
931 tty->termios.c_cflag = B9600 | CS8 | CREAD | HUPCL |
932 CLOCAL;
933 tty->termios.c_ispeed = 9600;
934 tty->termios.c_ospeed = 9600;
935 } else if (priv->chiptype == CT_CA42V2) {
936 tty->termios = tty_std_termios;
937 tty->termios.c_cflag = B9600 | CS8 | CREAD | HUPCL |
938 CLOCAL;
939 tty->termios.c_ispeed = 9600;
940 tty->termios.c_ospeed = 9600;
941 }
942 priv->termios_initialized = 1;
943 }
944 spin_unlock_irqrestore(&priv->lock, flags);
945
946 /* Unsupported features need clearing */
947 tty->termios.c_cflag &= ~(CMSPAR|CRTSCTS);
948
949 cflag = tty->termios.c_cflag;
950 iflag = tty->termios.c_iflag;
951
952 /* check if there are new settings */
953 if (old_termios) {
954 spin_lock_irqsave(&priv->lock, flags);
955 priv->tmp_termios = tty->termios;
956 spin_unlock_irqrestore(&priv->lock, flags);
957 }
958
959 /* set number of data bits, parity, stop bits */
960 /* when parity is disabled the parity type bit is ignored */
961
962 /* 1 means 2 stop bits, 0 means 1 stop bit */
963 stop_bits = cflag & CSTOPB ? 1 : 0;
964
965 if (cflag & PARENB) {
966 parity_enable = 1;
967 /* 1 means odd parity, 0 means even parity */
968 parity_type = cflag & PARODD ? 1 : 0;
969 } else
970 parity_enable = parity_type = 0;
971
972 switch (cflag & CSIZE) {
973 case CS5:
974 data_bits = 0;
975 break;
976 case CS6:
977 data_bits = 1;
978 break;
979 case CS7:
980 data_bits = 2;
981 break;
982 case CS8:
983 data_bits = 3;
984 break;
985 default:
986 dev_err(dev, "%s - CSIZE was set, but not CS5-CS8\n", __func__);
987 data_bits = 3;
988 }
989 spin_lock_irqsave(&priv->lock, flags);
990 oldlines = priv->line_control;
991 if ((cflag & CBAUD) == B0) {
992 /* drop dtr and rts */
993 dev_dbg(dev, "%s - dropping the lines, baud rate 0bps\n", __func__);
994 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
995 } else
996 priv->line_control = (CONTROL_DTR | CONTROL_RTS);
997 spin_unlock_irqrestore(&priv->lock, flags);
998
999 dev_dbg(dev, "%s - sending %d stop_bits, %d parity_enable, %d parity_type, %d data_bits (+5)\n",
1000 __func__, stop_bits, parity_enable, parity_type, data_bits);
1001
1002 cypress_serial_control(tty, port, tty_get_baud_rate(tty),
1003 data_bits, stop_bits,
1004 parity_enable, parity_type,
1005 0, CYPRESS_SET_CONFIG);
1006
1007 /* we perform a CYPRESS_GET_CONFIG so that the current settings are
1008 * filled into the private structure this should confirm that all is
1009 * working if it returns what we just set */
1010 cypress_serial_control(tty, port, 0, 0, 0, 0, 0, 0, CYPRESS_GET_CONFIG);
1011
1012 /* Here we can define custom tty settings for devices; the main tty
1013 * termios flag base comes from empeg.c */
1014
1015 spin_lock_irqsave(&priv->lock, flags);
1016 if (priv->chiptype == CT_EARTHMATE && priv->baud_rate == 4800) {
1017 dev_dbg(dev, "Using custom termios settings for a baud rate of 4800bps.\n");
1018 /* define custom termios settings for NMEA protocol */
1019
1020 tty->termios.c_iflag /* input modes - */
1021 &= ~(IGNBRK /* disable ignore break */
1022 | BRKINT /* disable break causes interrupt */
1023 | PARMRK /* disable mark parity errors */
1024 | ISTRIP /* disable clear high bit of input char */
1025 | INLCR /* disable translate NL to CR */
1026 | IGNCR /* disable ignore CR */
1027 | ICRNL /* disable translate CR to NL */
1028 | IXON); /* disable enable XON/XOFF flow control */
1029
1030 tty->termios.c_oflag /* output modes */
1031 &= ~OPOST; /* disable postprocess output char */
1032
1033 tty->termios.c_lflag /* line discipline modes */
1034 &= ~(ECHO /* disable echo input characters */
1035 | ECHONL /* disable echo new line */
1036 | ICANON /* disable erase, kill, werase, and rprnt
1037 special characters */
1038 | ISIG /* disable interrupt, quit, and suspend
1039 special characters */
1040 | IEXTEN); /* disable non-POSIX special characters */
1041 } /* CT_CYPHIDCOM: Application should handle this for device */
1042
1043 linechange = (priv->line_control != oldlines);
1044 spin_unlock_irqrestore(&priv->lock, flags);
1045
1046 /* if necessary, set lines */
1047 if (linechange) {
1048 priv->cmd_ctrl = 1;
1049 cypress_write(tty, port, NULL, 0);
1050 }
1051 } /* cypress_set_termios */
1052
1053
1054 /* returns amount of data still left in soft buffer */
1055 static int cypress_chars_in_buffer(struct tty_struct *tty)
1056 {
1057 struct usb_serial_port *port = tty->driver_data;
1058 struct cypress_private *priv = usb_get_serial_port_data(port);
1059 int chars = 0;
1060 unsigned long flags;
1061
1062 spin_lock_irqsave(&priv->lock, flags);
1063 chars = kfifo_len(&priv->write_fifo);
1064 spin_unlock_irqrestore(&priv->lock, flags);
1065
1066 dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
1067 return chars;
1068 }
1069
1070
1071 static void cypress_throttle(struct tty_struct *tty)
1072 {
1073 struct usb_serial_port *port = tty->driver_data;
1074 struct cypress_private *priv = usb_get_serial_port_data(port);
1075
1076 spin_lock_irq(&priv->lock);
1077 priv->rx_flags = THROTTLED;
1078 spin_unlock_irq(&priv->lock);
1079 }
1080
1081
1082 static void cypress_unthrottle(struct tty_struct *tty)
1083 {
1084 struct usb_serial_port *port = tty->driver_data;
1085 struct cypress_private *priv = usb_get_serial_port_data(port);
1086 int actually_throttled, result;
1087
1088 spin_lock_irq(&priv->lock);
1089 actually_throttled = priv->rx_flags & ACTUALLY_THROTTLED;
1090 priv->rx_flags = 0;
1091 spin_unlock_irq(&priv->lock);
1092
1093 if (!priv->comm_is_ok)
1094 return;
1095
1096 if (actually_throttled) {
1097 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
1098 if (result) {
1099 dev_err(&port->dev, "%s - failed submitting read urb, "
1100 "error %d\n", __func__, result);
1101 cypress_set_dead(port);
1102 }
1103 }
1104 }
1105
1106
1107 static void cypress_read_int_callback(struct urb *urb)
1108 {
1109 struct usb_serial_port *port = urb->context;
1110 struct cypress_private *priv = usb_get_serial_port_data(port);
1111 struct device *dev = &urb->dev->dev;
1112 struct tty_struct *tty;
1113 unsigned char *data = urb->transfer_buffer;
1114 unsigned long flags;
1115 char tty_flag = TTY_NORMAL;
1116 int havedata = 0;
1117 int bytes = 0;
1118 int result;
1119 int i = 0;
1120 int status = urb->status;
1121
1122 switch (status) {
1123 case 0: /* success */
1124 break;
1125 case -ECONNRESET:
1126 case -ENOENT:
1127 case -ESHUTDOWN:
1128 /* precursor to disconnect so just go away */
1129 return;
1130 case -EPIPE:
1131 /* Can't call usb_clear_halt while in_interrupt */
1132 /* FALLS THROUGH */
1133 default:
1134 /* something ugly is going on... */
1135 dev_err(dev, "%s - unexpected nonzero read status received: %d\n",
1136 __func__, status);
1137 cypress_set_dead(port);
1138 return;
1139 }
1140
1141 spin_lock_irqsave(&priv->lock, flags);
1142 if (priv->rx_flags & THROTTLED) {
1143 dev_dbg(dev, "%s - now throttling\n", __func__);
1144 priv->rx_flags |= ACTUALLY_THROTTLED;
1145 spin_unlock_irqrestore(&priv->lock, flags);
1146 return;
1147 }
1148 spin_unlock_irqrestore(&priv->lock, flags);
1149
1150 tty = tty_port_tty_get(&port->port);
1151 if (!tty) {
1152 dev_dbg(dev, "%s - bad tty pointer - exiting\n", __func__);
1153 return;
1154 }
1155
1156 spin_lock_irqsave(&priv->lock, flags);
1157 result = urb->actual_length;
1158 switch (priv->pkt_fmt) {
1159 default:
1160 case packet_format_1:
1161 /* This is for the CY7C64013... */
1162 priv->current_status = data[0] & 0xF8;
1163 bytes = data[1] + 2;
1164 i = 2;
1165 if (bytes > 2)
1166 havedata = 1;
1167 break;
1168 case packet_format_2:
1169 /* This is for the CY7C63743... */
1170 priv->current_status = data[0] & 0xF8;
1171 bytes = (data[0] & 0x07) + 1;
1172 i = 1;
1173 if (bytes > 1)
1174 havedata = 1;
1175 break;
1176 }
1177 spin_unlock_irqrestore(&priv->lock, flags);
1178 if (result < bytes) {
1179 dev_dbg(dev,
1180 "%s - wrong packet size - received %d bytes but packet said %d bytes\n",
1181 __func__, result, bytes);
1182 goto continue_read;
1183 }
1184
1185 usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
1186
1187 spin_lock_irqsave(&priv->lock, flags);
1188 /* check to see if status has changed */
1189 if (priv->current_status != priv->prev_status) {
1190 priv->diff_status |= priv->current_status ^
1191 priv->prev_status;
1192 wake_up_interruptible(&port->delta_msr_wait);
1193 priv->prev_status = priv->current_status;
1194 }
1195 spin_unlock_irqrestore(&priv->lock, flags);
1196
1197 /* hangup, as defined in acm.c... this might be a bad place for it
1198 * though */
1199 if (tty && !(tty->termios.c_cflag & CLOCAL) &&
1200 !(priv->current_status & UART_CD)) {
1201 dev_dbg(dev, "%s - calling hangup\n", __func__);
1202 tty_hangup(tty);
1203 goto continue_read;
1204 }
1205
1206 /* There is one error bit... I'm assuming it is a parity error
1207 * indicator as the generic firmware will set this bit to 1 if a
1208 * parity error occurs.
1209 * I can not find reference to any other error events. */
1210 spin_lock_irqsave(&priv->lock, flags);
1211 if (priv->current_status & CYP_ERROR) {
1212 spin_unlock_irqrestore(&priv->lock, flags);
1213 tty_flag = TTY_PARITY;
1214 dev_dbg(dev, "%s - Parity Error detected\n", __func__);
1215 } else
1216 spin_unlock_irqrestore(&priv->lock, flags);
1217
1218 /* process read if there is data other than line status */
1219 if (bytes > i) {
1220 tty_insert_flip_string_fixed_flag(&port->port, data + i,
1221 tty_flag, bytes - i);
1222 tty_flip_buffer_push(&port->port);
1223 }
1224
1225 spin_lock_irqsave(&priv->lock, flags);
1226 /* control and status byte(s) are also counted */
1227 priv->bytes_in += bytes;
1228 spin_unlock_irqrestore(&priv->lock, flags);
1229
1230 continue_read:
1231 tty_kref_put(tty);
1232
1233 /* Continue trying to always read */
1234
1235 if (priv->comm_is_ok) {
1236 usb_fill_int_urb(port->interrupt_in_urb, port->serial->dev,
1237 usb_rcvintpipe(port->serial->dev,
1238 port->interrupt_in_endpointAddress),
1239 port->interrupt_in_urb->transfer_buffer,
1240 port->interrupt_in_urb->transfer_buffer_length,
1241 cypress_read_int_callback, port,
1242 priv->read_urb_interval);
1243 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
1244 if (result && result != -EPERM) {
1245 dev_err(dev, "%s - failed resubmitting read urb, error %d\n",
1246 __func__, result);
1247 cypress_set_dead(port);
1248 }
1249 }
1250 } /* cypress_read_int_callback */
1251
1252
1253 static void cypress_write_int_callback(struct urb *urb)
1254 {
1255 struct usb_serial_port *port = urb->context;
1256 struct cypress_private *priv = usb_get_serial_port_data(port);
1257 struct device *dev = &urb->dev->dev;
1258 int result;
1259 int status = urb->status;
1260
1261 switch (status) {
1262 case 0:
1263 /* success */
1264 break;
1265 case -ECONNRESET:
1266 case -ENOENT:
1267 case -ESHUTDOWN:
1268 /* this urb is terminated, clean up */
1269 dev_dbg(dev, "%s - urb shutting down with status: %d\n",
1270 __func__, status);
1271 priv->write_urb_in_use = 0;
1272 return;
1273 case -EPIPE: /* no break needed; clear halt and resubmit */
1274 if (!priv->comm_is_ok)
1275 break;
1276 usb_clear_halt(port->serial->dev, 0x02);
1277 /* error in the urb, so we have to resubmit it */
1278 dev_dbg(dev, "%s - nonzero write bulk status received: %d\n",
1279 __func__, status);
1280 port->interrupt_out_urb->transfer_buffer_length = 1;
1281 result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC);
1282 if (!result)
1283 return;
1284 dev_err(dev, "%s - failed resubmitting write urb, error %d\n",
1285 __func__, result);
1286 cypress_set_dead(port);
1287 break;
1288 default:
1289 dev_err(dev, "%s - unexpected nonzero write status received: %d\n",
1290 __func__, status);
1291 cypress_set_dead(port);
1292 break;
1293 }
1294 priv->write_urb_in_use = 0;
1295
1296 /* send any buffered data */
1297 cypress_send(port);
1298 }
1299
1300 module_usb_serial_driver(serial_drivers, id_table_combined);
1301
1302 MODULE_AUTHOR(DRIVER_AUTHOR);
1303 MODULE_DESCRIPTION(DRIVER_DESC);
1304 MODULE_LICENSE("GPL");
1305
1306 module_param(stats, bool, S_IRUGO | S_IWUSR);
1307 MODULE_PARM_DESC(stats, "Enable statistics or not");
1308 module_param(interval, int, S_IRUGO | S_IWUSR);
1309 MODULE_PARM_DESC(interval, "Overrides interrupt interval");
1310 module_param(unstable_bauds, bool, S_IRUGO | S_IWUSR);
1311 MODULE_PARM_DESC(unstable_bauds, "Allow unstable baud rates");
kernel source for telekom puls (alcatel/mediatek)