1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * USB Cypress M8 driver
4 *
5 * Copyright (C) 2004
6 * Lonnie Mendez (dignome@gmail.com)
7 * Copyright (C) 2003,2004
8 * Neil Whelchel (koyama@firstlight.net)
9 *
10 * See Documentation/usb/usb-serial.txt for more information on using this
11 * driver
12 *
13 * See http://geocities.com/i0xox0i for information on this driver and the
14 * earthmate usb device.
15 */
16
17 /* Thanks to Neil Whelchel for writing the first cypress m8 implementation
18 for linux. */
19 /* Thanks to cypress for providing references for the hid reports. */
20 /* Thanks to Jiang Zhang for providing links and for general help. */
21 /* Code originates and was built up from ftdi_sio, belkin, pl2303 and others.*/
22
23
24 #include <linux/kernel.h>
25 #include <linux/errno.h>
26 #include <linux/slab.h>
27 #include <linux/tty.h>
28 #include <linux/tty_driver.h>
29 #include <linux/tty_flip.h>
30 #include <linux/module.h>
31 #include <linux/moduleparam.h>
32 #include <linux/spinlock.h>
33 #include <linux/usb.h>
34 #include <linux/usb/serial.h>
35 #include <linux/serial.h>
36 #include <linux/kfifo.h>
37 #include <linux/delay.h>
38 #include <linux/uaccess.h>
39 #include <asm/unaligned.h>
40
41 #include "cypress_m8.h"
42
43
44 static bool stats;
45 static int interval;
46 static bool unstable_bauds;
47
48 #define DRIVER_AUTHOR "Lonnie Mendez <dignome@gmail.com>, Neil Whelchel <koyama@firstlight.net>"
49 #define DRIVER_DESC "Cypress USB to Serial Driver"
50
51 /* write buffer size defines */
52 #define CYPRESS_BUF_SIZE 1024
53
54 static const struct usb_device_id id_table_earthmate[] = {
55 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
56 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
57 { } /* Terminating entry */
58 };
59
60 static const struct usb_device_id id_table_cyphidcomrs232[] = {
61 { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
62 { USB_DEVICE(VENDOR_ID_SAI, PRODUCT_ID_CYPHIDCOM) },
63 { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) },
64 { USB_DEVICE(VENDOR_ID_FRWD, PRODUCT_ID_CYPHIDCOM_FRWD) },
65 { } /* Terminating entry */
66 };
67
68 static const struct usb_device_id id_table_nokiaca42v2[] = {
69 { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
70 { } /* Terminating entry */
71 };
72
73 static const struct usb_device_id id_table_combined[] = {
74 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
75 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
76 { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
77 { USB_DEVICE(VENDOR_ID_SAI, PRODUCT_ID_CYPHIDCOM) },
78 { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) },
79 { USB_DEVICE(VENDOR_ID_FRWD, PRODUCT_ID_CYPHIDCOM_FRWD) },
80 { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
81 { } /* Terminating entry */
82 };
83
84 MODULE_DEVICE_TABLE(usb, id_table_combined);
85
86 enum packet_format {
87 packet_format_1, /* b0:status, b1:payload count */
88 packet_format_2 /* b0[7:3]:status, b0[2:0]:payload count */
89 };
90
91 struct cypress_private {
92 spinlock_t lock; /* private lock */
93 int chiptype; /* identifier of device, for quirks/etc */
94 int bytes_in; /* used for statistics */
95 int bytes_out; /* used for statistics */
96 int cmd_count; /* used for statistics */
97 int cmd_ctrl; /* always set this to 1 before issuing a command */
98 struct kfifo write_fifo; /* write fifo */
99 int write_urb_in_use; /* write urb in use indicator */
100 int write_urb_interval; /* interval to use for write urb */
101 int read_urb_interval; /* interval to use for read urb */
102 int comm_is_ok; /* true if communication is (still) ok */
103 int termios_initialized;
104 __u8 line_control; /* holds dtr / rts value */
105 __u8 current_status; /* received from last read - info on dsr,cts,cd,ri,etc */
106 __u8 current_config; /* stores the current configuration byte */
107 __u8 rx_flags; /* throttling - used from whiteheat/ftdi_sio */
108 enum packet_format pkt_fmt; /* format to use for packet send / receive */
109 int get_cfg_unsafe; /* If true, the CYPRESS_GET_CONFIG is unsafe */
110 int baud_rate; /* stores current baud rate in
111 integer form */
112 int isthrottled; /* if throttled, discard reads */
113 char prev_status; /* used for TIOCMIWAIT */
114 /* we pass a pointer to this as the argument sent to
115 cypress_set_termios old_termios */
116 struct ktermios tmp_termios; /* stores the old termios settings */
117 };
118
119 /* function prototypes for the Cypress USB to serial device */
120 static int cypress_earthmate_port_probe(struct usb_serial_port *port);
121 static int cypress_hidcom_port_probe(struct usb_serial_port *port);
122 static int cypress_ca42v2_port_probe(struct usb_serial_port *port);
123 static int cypress_port_remove(struct usb_serial_port *port);
124 static int cypress_open(struct tty_struct *tty, struct usb_serial_port *port);
125 static void cypress_close(struct usb_serial_port *port);
126 static void cypress_dtr_rts(struct usb_serial_port *port, int on);
127 static int cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
128 const unsigned char *buf, int count);
129 static void cypress_send(struct usb_serial_port *port);
130 static int cypress_write_room(struct tty_struct *tty);
131 static void cypress_set_termios(struct tty_struct *tty,
132 struct usb_serial_port *port, struct ktermios *old);
133 static int cypress_tiocmget(struct tty_struct *tty);
134 static int cypress_tiocmset(struct tty_struct *tty,
135 unsigned int set, unsigned int clear);
136 static int cypress_chars_in_buffer(struct tty_struct *tty);
137 static void cypress_throttle(struct tty_struct *tty);
138 static void cypress_unthrottle(struct tty_struct *tty);
139 static void cypress_set_dead(struct usb_serial_port *port);
140 static void cypress_read_int_callback(struct urb *urb);
141 static void cypress_write_int_callback(struct urb *urb);
142
143 static struct usb_serial_driver cypress_earthmate_device = {
144 .driver = {
145 .owner = THIS_MODULE,
146 .name = "earthmate",
147 },
148 .description = "DeLorme Earthmate USB",
149 .id_table = id_table_earthmate,
150 .num_ports = 1,
151 .port_probe = cypress_earthmate_port_probe,
152 .port_remove = cypress_port_remove,
153 .open = cypress_open,
154 .close = cypress_close,
155 .dtr_rts = cypress_dtr_rts,
156 .write = cypress_write,
157 .write_room = cypress_write_room,
158 .set_termios = cypress_set_termios,
159 .tiocmget = cypress_tiocmget,
160 .tiocmset = cypress_tiocmset,
161 .tiocmiwait = usb_serial_generic_tiocmiwait,
162 .chars_in_buffer = cypress_chars_in_buffer,
163 .throttle = cypress_throttle,
164 .unthrottle = cypress_unthrottle,
165 .read_int_callback = cypress_read_int_callback,
166 .write_int_callback = cypress_write_int_callback,
167 };
168
169 static struct usb_serial_driver cypress_hidcom_device = {
170 .driver = {
171 .owner = THIS_MODULE,
172 .name = "cyphidcom",
173 },
174 .description = "HID->COM RS232 Adapter",
175 .id_table = id_table_cyphidcomrs232,
176 .num_ports = 1,
177 .port_probe = cypress_hidcom_port_probe,
178 .port_remove = cypress_port_remove,
179 .open = cypress_open,
180 .close = cypress_close,
181 .dtr_rts = cypress_dtr_rts,
182 .write = cypress_write,
183 .write_room = cypress_write_room,
184 .set_termios = cypress_set_termios,
185 .tiocmget = cypress_tiocmget,
186 .tiocmset = cypress_tiocmset,
187 .tiocmiwait = usb_serial_generic_tiocmiwait,
188 .chars_in_buffer = cypress_chars_in_buffer,
189 .throttle = cypress_throttle,
190 .unthrottle = cypress_unthrottle,
191 .read_int_callback = cypress_read_int_callback,
192 .write_int_callback = cypress_write_int_callback,
193 };
194
195 static struct usb_serial_driver cypress_ca42v2_device = {
196 .driver = {
197 .owner = THIS_MODULE,
198 .name = "nokiaca42v2",
199 },
200 .description = "Nokia CA-42 V2 Adapter",
201 .id_table = id_table_nokiaca42v2,
202 .num_ports = 1,
203 .port_probe = cypress_ca42v2_port_probe,
204 .port_remove = cypress_port_remove,
205 .open = cypress_open,
206 .close = cypress_close,
207 .dtr_rts = cypress_dtr_rts,
208 .write = cypress_write,
209 .write_room = cypress_write_room,
210 .set_termios = cypress_set_termios,
211 .tiocmget = cypress_tiocmget,
212 .tiocmset = cypress_tiocmset,
213 .tiocmiwait = usb_serial_generic_tiocmiwait,
214 .chars_in_buffer = cypress_chars_in_buffer,
215 .throttle = cypress_throttle,
216 .unthrottle = cypress_unthrottle,
217 .read_int_callback = cypress_read_int_callback,
218 .write_int_callback = cypress_write_int_callback,
219 };
220
221 static struct usb_serial_driver * const serial_drivers[] = {
222 &cypress_earthmate_device, &cypress_hidcom_device,
223 &cypress_ca42v2_device, NULL
224 };
225
226 /*****************************************************************************
227 * Cypress serial helper functions
228 *****************************************************************************/
229
230 /* FRWD Dongle hidcom needs to skip reset and speed checks */
is_frwd(struct usb_device * dev)231 static inline bool is_frwd(struct usb_device *dev)
232 {
233 return ((le16_to_cpu(dev->descriptor.idVendor) == VENDOR_ID_FRWD) &&
234 (le16_to_cpu(dev->descriptor.idProduct) == PRODUCT_ID_CYPHIDCOM_FRWD));
235 }
236
analyze_baud_rate(struct usb_serial_port * port,speed_t new_rate)237 static int analyze_baud_rate(struct usb_serial_port *port, speed_t new_rate)
238 {
239 struct cypress_private *priv;
240 priv = usb_get_serial_port_data(port);
241
242 if (unstable_bauds)
243 return new_rate;
244
245 /* FRWD Dongle uses 115200 bps */
246 if (is_frwd(port->serial->dev))
247 return new_rate;
248
249 /*
250 * The general purpose firmware for the Cypress M8 allows for
251 * a maximum speed of 57600bps (I have no idea whether DeLorme
252 * chose to use the general purpose firmware or not), if you
253 * need to modify this speed setting for your own project
254 * please add your own chiptype and modify the code likewise.
255 * The Cypress HID->COM device will work successfully up to
256 * 115200bps (but the actual throughput is around 3kBps).
257 */
258 if (port->serial->dev->speed == USB_SPEED_LOW) {
259 /*
260 * Mike Isely <isely@pobox.com> 2-Feb-2008: The
261 * Cypress app note that describes this mechanism
262 * states the the low-speed part can't handle more
263 * than 800 bytes/sec, in which case 4800 baud is the
264 * safest speed for a part like that.
265 */
266 if (new_rate > 4800) {
267 dev_dbg(&port->dev,
268 "%s - failed setting baud rate, device incapable speed %d\n",
269 __func__, new_rate);
270 return -1;
271 }
272 }
273 switch (priv->chiptype) {
274 case CT_EARTHMATE:
275 if (new_rate <= 600) {
276 /* 300 and 600 baud rates are supported under
277 * the generic firmware, but are not used with
278 * NMEA and SiRF protocols */
279 dev_dbg(&port->dev,
280 "%s - failed setting baud rate, unsupported speed of %d on Earthmate GPS\n",
281 __func__, new_rate);
282 return -1;
283 }
284 break;
285 default:
286 break;
287 }
288 return new_rate;
289 }
290
291
292 /* This function can either set or retrieve the current serial line settings */
cypress_serial_control(struct tty_struct * tty,struct usb_serial_port * port,speed_t baud_rate,int data_bits,int stop_bits,int parity_enable,int parity_type,int reset,int cypress_request_type)293 static int cypress_serial_control(struct tty_struct *tty,
294 struct usb_serial_port *port, speed_t baud_rate, int data_bits,
295 int stop_bits, int parity_enable, int parity_type, int reset,
296 int cypress_request_type)
297 {
298 int new_baudrate = 0, retval = 0, tries = 0;
299 struct cypress_private *priv;
300 struct device *dev = &port->dev;
301 u8 *feature_buffer;
302 const unsigned int feature_len = 5;
303 unsigned long flags;
304
305 priv = usb_get_serial_port_data(port);
306
307 if (!priv->comm_is_ok)
308 return -ENODEV;
309
310 feature_buffer = kcalloc(feature_len, sizeof(u8), GFP_KERNEL);
311 if (!feature_buffer)
312 return -ENOMEM;
313
314 switch (cypress_request_type) {
315 case CYPRESS_SET_CONFIG:
316 /* 0 means 'Hang up' so doesn't change the true bit rate */
317 new_baudrate = priv->baud_rate;
318 if (baud_rate && baud_rate != priv->baud_rate) {
319 dev_dbg(dev, "%s - baud rate is changing\n", __func__);
320 retval = analyze_baud_rate(port, baud_rate);
321 if (retval >= 0) {
322 new_baudrate = retval;
323 dev_dbg(dev, "%s - New baud rate set to %d\n",
324 __func__, new_baudrate);
325 }
326 }
327 dev_dbg(dev, "%s - baud rate is being sent as %d\n", __func__,
328 new_baudrate);
329
330 /* fill the feature_buffer with new configuration */
331 put_unaligned_le32(new_baudrate, feature_buffer);
332 feature_buffer[4] |= data_bits; /* assign data bits in 2 bit space ( max 3 ) */
333 /* 1 bit gap */
334 feature_buffer[4] |= (stop_bits << 3); /* assign stop bits in 1 bit space */
335 feature_buffer[4] |= (parity_enable << 4); /* assign parity flag in 1 bit space */
336 feature_buffer[4] |= (parity_type << 5); /* assign parity type in 1 bit space */
337 /* 1 bit gap */
338 feature_buffer[4] |= (reset << 7); /* assign reset at end of byte, 1 bit space */
339
340 dev_dbg(dev, "%s - device is being sent this feature report:\n", __func__);
341 dev_dbg(dev, "%s - %02X - %02X - %02X - %02X - %02X\n", __func__,
342 feature_buffer[0], feature_buffer[1],
343 feature_buffer[2], feature_buffer[3],
344 feature_buffer[4]);
345
346 do {
347 retval = usb_control_msg(port->serial->dev,
348 usb_sndctrlpipe(port->serial->dev, 0),
349 HID_REQ_SET_REPORT,
350 USB_DIR_OUT | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
351 0x0300, 0, feature_buffer,
352 feature_len, 500);
353
354 if (tries++ >= 3)
355 break;
356
357 } while (retval != feature_len &&
358 retval != -ENODEV);
359
360 if (retval != feature_len) {
361 dev_err(dev, "%s - failed sending serial line settings - %d\n",
362 __func__, retval);
363 cypress_set_dead(port);
364 } else {
365 spin_lock_irqsave(&priv->lock, flags);
366 priv->baud_rate = new_baudrate;
367 priv->current_config = feature_buffer[4];
368 spin_unlock_irqrestore(&priv->lock, flags);
369 /* If we asked for a speed change encode it */
370 if (baud_rate)
371 tty_encode_baud_rate(tty,
372 new_baudrate, new_baudrate);
373 }
374 break;
375 case CYPRESS_GET_CONFIG:
376 if (priv->get_cfg_unsafe) {
377 /* Not implemented for this device,
378 and if we try to do it we're likely
379 to crash the hardware. */
380 retval = -ENOTTY;
381 goto out;
382 }
383 dev_dbg(dev, "%s - retreiving serial line settings\n", __func__);
384 do {
385 retval = usb_control_msg(port->serial->dev,
386 usb_rcvctrlpipe(port->serial->dev, 0),
387 HID_REQ_GET_REPORT,
388 USB_DIR_IN | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
389 0x0300, 0, feature_buffer,
390 feature_len, 500);
391
392 if (tries++ >= 3)
393 break;
394 } while (retval != feature_len
395 && retval != -ENODEV);
396
397 if (retval != feature_len) {
398 dev_err(dev, "%s - failed to retrieve serial line settings - %d\n",
399 __func__, retval);
400 cypress_set_dead(port);
401 goto out;
402 } else {
403 spin_lock_irqsave(&priv->lock, flags);
404 /* store the config in one byte, and later
405 use bit masks to check values */
406 priv->current_config = feature_buffer[4];
407 priv->baud_rate = get_unaligned_le32(feature_buffer);
408 spin_unlock_irqrestore(&priv->lock, flags);
409 }
410 }
411 spin_lock_irqsave(&priv->lock, flags);
412 ++priv->cmd_count;
413 spin_unlock_irqrestore(&priv->lock, flags);
414 out:
415 kfree(feature_buffer);
416 return retval;
417 } /* cypress_serial_control */
418
419
cypress_set_dead(struct usb_serial_port * port)420 static void cypress_set_dead(struct usb_serial_port *port)
421 {
422 struct cypress_private *priv = usb_get_serial_port_data(port);
423 unsigned long flags;
424
425 spin_lock_irqsave(&priv->lock, flags);
426 if (!priv->comm_is_ok) {
427 spin_unlock_irqrestore(&priv->lock, flags);
428 return;
429 }
430 priv->comm_is_ok = 0;
431 spin_unlock_irqrestore(&priv->lock, flags);
432
433 dev_err(&port->dev, "cypress_m8 suspending failing port %d - "
434 "interval might be too short\n", port->port_number);
435 }
436
437
438 /*****************************************************************************
439 * Cypress serial driver functions
440 *****************************************************************************/
441
442
cypress_generic_port_probe(struct usb_serial_port * port)443 static int cypress_generic_port_probe(struct usb_serial_port *port)
444 {
445 struct usb_serial *serial = port->serial;
446 struct cypress_private *priv;
447
448 if (!port->interrupt_out_urb || !port->interrupt_in_urb) {
449 dev_err(&port->dev, "required endpoint is missing\n");
450 return -ENODEV;
451 }
452
453 priv = kzalloc(sizeof(struct cypress_private), GFP_KERNEL);
454 if (!priv)
455 return -ENOMEM;
456
457 priv->comm_is_ok = !0;
458 spin_lock_init(&priv->lock);
459 if (kfifo_alloc(&priv->write_fifo, CYPRESS_BUF_SIZE, GFP_KERNEL)) {
460 kfree(priv);
461 return -ENOMEM;
462 }
463
464 /* Skip reset for FRWD device. It is a workaound:
465 device hangs if it receives SET_CONFIGURE in Configured
466 state. */
467 if (!is_frwd(serial->dev))
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 dev_dbg(&port->dev, "%s - read & write intervals forced to %d\n",
489 __func__, interval);
490 } else {
491 priv->write_urb_interval = port->interrupt_out_urb->interval;
492 priv->read_urb_interval = port->interrupt_in_urb->interval;
493 dev_dbg(&port->dev, "%s - intervals: read=%d write=%d\n",
494 __func__, priv->read_urb_interval,
495 priv->write_urb_interval);
496 }
497 usb_set_serial_port_data(port, priv);
498
499 port->port.drain_delay = 256;
500
501 return 0;
502 }
503
504
cypress_earthmate_port_probe(struct usb_serial_port * port)505 static int cypress_earthmate_port_probe(struct usb_serial_port *port)
506 {
507 struct usb_serial *serial = port->serial;
508 struct cypress_private *priv;
509 int ret;
510
511 ret = cypress_generic_port_probe(port);
512 if (ret) {
513 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
514 return ret;
515 }
516
517 priv = usb_get_serial_port_data(port);
518 priv->chiptype = CT_EARTHMATE;
519 /* All Earthmate devices use the separated-count packet
520 format! Idiotic. */
521 priv->pkt_fmt = packet_format_1;
522 if (serial->dev->descriptor.idProduct !=
523 cpu_to_le16(PRODUCT_ID_EARTHMATEUSB)) {
524 /* The old original USB Earthmate seemed able to
525 handle GET_CONFIG requests; everything they've
526 produced since that time crashes if this command is
527 attempted :-( */
528 dev_dbg(&port->dev,
529 "%s - Marking this device as unsafe for GET_CONFIG commands\n",
530 __func__);
531 priv->get_cfg_unsafe = !0;
532 }
533
534 return 0;
535 }
536
cypress_hidcom_port_probe(struct usb_serial_port * port)537 static int cypress_hidcom_port_probe(struct usb_serial_port *port)
538 {
539 struct cypress_private *priv;
540 int ret;
541
542 ret = cypress_generic_port_probe(port);
543 if (ret) {
544 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
545 return ret;
546 }
547
548 priv = usb_get_serial_port_data(port);
549 priv->chiptype = CT_CYPHIDCOM;
550
551 return 0;
552 }
553
cypress_ca42v2_port_probe(struct usb_serial_port * port)554 static int cypress_ca42v2_port_probe(struct usb_serial_port *port)
555 {
556 struct cypress_private *priv;
557 int ret;
558
559 ret = cypress_generic_port_probe(port);
560 if (ret) {
561 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
562 return ret;
563 }
564
565 priv = usb_get_serial_port_data(port);
566 priv->chiptype = CT_CA42V2;
567
568 return 0;
569 }
570
cypress_port_remove(struct usb_serial_port * port)571 static int cypress_port_remove(struct usb_serial_port *port)
572 {
573 struct cypress_private *priv;
574
575 priv = usb_get_serial_port_data(port);
576
577 kfifo_free(&priv->write_fifo);
578 kfree(priv);
579
580 return 0;
581 }
582
cypress_open(struct tty_struct * tty,struct usb_serial_port * port)583 static int cypress_open(struct tty_struct *tty, struct usb_serial_port *port)
584 {
585 struct cypress_private *priv = usb_get_serial_port_data(port);
586 struct usb_serial *serial = port->serial;
587 unsigned long flags;
588 int result = 0;
589
590 if (!priv->comm_is_ok)
591 return -EIO;
592
593 /* clear halts before open */
594 usb_clear_halt(serial->dev, 0x81);
595 usb_clear_halt(serial->dev, 0x02);
596
597 spin_lock_irqsave(&priv->lock, flags);
598 /* reset read/write statistics */
599 priv->bytes_in = 0;
600 priv->bytes_out = 0;
601 priv->cmd_count = 0;
602 priv->rx_flags = 0;
603 spin_unlock_irqrestore(&priv->lock, flags);
604
605 /* Set termios */
606 cypress_send(port);
607
608 if (tty)
609 cypress_set_termios(tty, port, &priv->tmp_termios);
610
611 /* setup the port and start reading from the device */
612 usb_fill_int_urb(port->interrupt_in_urb, serial->dev,
613 usb_rcvintpipe(serial->dev, port->interrupt_in_endpointAddress),
614 port->interrupt_in_urb->transfer_buffer,
615 port->interrupt_in_urb->transfer_buffer_length,
616 cypress_read_int_callback, port, priv->read_urb_interval);
617 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
618
619 if (result) {
620 dev_err(&port->dev,
621 "%s - failed submitting read urb, error %d\n",
622 __func__, result);
623 cypress_set_dead(port);
624 }
625
626 return result;
627 } /* cypress_open */
628
cypress_dtr_rts(struct usb_serial_port * port,int on)629 static void cypress_dtr_rts(struct usb_serial_port *port, int on)
630 {
631 struct cypress_private *priv = usb_get_serial_port_data(port);
632 /* drop dtr and rts */
633 spin_lock_irq(&priv->lock);
634 if (on == 0)
635 priv->line_control = 0;
636 else
637 priv->line_control = CONTROL_DTR | CONTROL_RTS;
638 priv->cmd_ctrl = 1;
639 spin_unlock_irq(&priv->lock);
640 cypress_write(NULL, port, NULL, 0);
641 }
642
cypress_close(struct usb_serial_port * port)643 static void cypress_close(struct usb_serial_port *port)
644 {
645 struct cypress_private *priv = usb_get_serial_port_data(port);
646 unsigned long flags;
647
648 spin_lock_irqsave(&priv->lock, flags);
649 kfifo_reset_out(&priv->write_fifo);
650 spin_unlock_irqrestore(&priv->lock, flags);
651
652 dev_dbg(&port->dev, "%s - stopping urbs\n", __func__);
653 usb_kill_urb(port->interrupt_in_urb);
654 usb_kill_urb(port->interrupt_out_urb);
655
656 if (stats)
657 dev_info(&port->dev, "Statistics: %d Bytes In | %d Bytes Out | %d Commands Issued\n",
658 priv->bytes_in, priv->bytes_out, priv->cmd_count);
659 } /* cypress_close */
660
661
cypress_write(struct tty_struct * tty,struct usb_serial_port * port,const unsigned char * buf,int count)662 static int cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
663 const unsigned char *buf, int count)
664 {
665 struct cypress_private *priv = usb_get_serial_port_data(port);
666
667 dev_dbg(&port->dev, "%s - %d bytes\n", __func__, count);
668
669 /* line control commands, which need to be executed immediately,
670 are not put into the buffer for obvious reasons.
671 */
672 if (priv->cmd_ctrl) {
673 count = 0;
674 goto finish;
675 }
676
677 if (!count)
678 return count;
679
680 count = kfifo_in_locked(&priv->write_fifo, buf, count, &priv->lock);
681
682 finish:
683 cypress_send(port);
684
685 return count;
686 } /* cypress_write */
687
688
cypress_send(struct usb_serial_port * port)689 static void cypress_send(struct usb_serial_port *port)
690 {
691 int count = 0, result, offset, actual_size;
692 struct cypress_private *priv = usb_get_serial_port_data(port);
693 struct device *dev = &port->dev;
694 unsigned long flags;
695
696 if (!priv->comm_is_ok)
697 return;
698
699 dev_dbg(dev, "%s - interrupt out size is %d\n", __func__,
700 port->interrupt_out_size);
701
702 spin_lock_irqsave(&priv->lock, flags);
703 if (priv->write_urb_in_use) {
704 dev_dbg(dev, "%s - can't write, urb in use\n", __func__);
705 spin_unlock_irqrestore(&priv->lock, flags);
706 return;
707 }
708 spin_unlock_irqrestore(&priv->lock, flags);
709
710 /* clear buffer */
711 memset(port->interrupt_out_urb->transfer_buffer, 0,
712 port->interrupt_out_size);
713
714 spin_lock_irqsave(&priv->lock, flags);
715 switch (priv->pkt_fmt) {
716 default:
717 case packet_format_1:
718 /* this is for the CY7C64013... */
719 offset = 2;
720 port->interrupt_out_buffer[0] = priv->line_control;
721 break;
722 case packet_format_2:
723 /* this is for the CY7C63743... */
724 offset = 1;
725 port->interrupt_out_buffer[0] = priv->line_control;
726 break;
727 }
728
729 if (priv->line_control & CONTROL_RESET)
730 priv->line_control &= ~CONTROL_RESET;
731
732 if (priv->cmd_ctrl) {
733 priv->cmd_count++;
734 dev_dbg(dev, "%s - line control command being issued\n", __func__);
735 spin_unlock_irqrestore(&priv->lock, flags);
736 goto send;
737 } else
738 spin_unlock_irqrestore(&priv->lock, flags);
739
740 count = kfifo_out_locked(&priv->write_fifo,
741 &port->interrupt_out_buffer[offset],
742 port->interrupt_out_size - offset,
743 &priv->lock);
744 if (count == 0)
745 return;
746
747 switch (priv->pkt_fmt) {
748 default:
749 case packet_format_1:
750 port->interrupt_out_buffer[1] = count;
751 break;
752 case packet_format_2:
753 port->interrupt_out_buffer[0] |= count;
754 }
755
756 dev_dbg(dev, "%s - count is %d\n", __func__, count);
757
758 send:
759 spin_lock_irqsave(&priv->lock, flags);
760 priv->write_urb_in_use = 1;
761 spin_unlock_irqrestore(&priv->lock, flags);
762
763 if (priv->cmd_ctrl)
764 actual_size = 1;
765 else
766 actual_size = count +
767 (priv->pkt_fmt == packet_format_1 ? 2 : 1);
768
769 usb_serial_debug_data(dev, __func__, port->interrupt_out_size,
770 port->interrupt_out_urb->transfer_buffer);
771
772 usb_fill_int_urb(port->interrupt_out_urb, port->serial->dev,
773 usb_sndintpipe(port->serial->dev, port->interrupt_out_endpointAddress),
774 port->interrupt_out_buffer, actual_size,
775 cypress_write_int_callback, port, priv->write_urb_interval);
776 result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC);
777 if (result) {
778 dev_err_console(port,
779 "%s - failed submitting write urb, error %d\n",
780 __func__, result);
781 priv->write_urb_in_use = 0;
782 cypress_set_dead(port);
783 }
784
785 spin_lock_irqsave(&priv->lock, flags);
786 if (priv->cmd_ctrl)
787 priv->cmd_ctrl = 0;
788
789 /* do not count the line control and size bytes */
790 priv->bytes_out += count;
791 spin_unlock_irqrestore(&priv->lock, flags);
792
793 usb_serial_port_softint(port);
794 } /* cypress_send */
795
796
797 /* returns how much space is available in the soft buffer */
cypress_write_room(struct tty_struct * tty)798 static int cypress_write_room(struct tty_struct *tty)
799 {
800 struct usb_serial_port *port = tty->driver_data;
801 struct cypress_private *priv = usb_get_serial_port_data(port);
802 int room = 0;
803 unsigned long flags;
804
805 spin_lock_irqsave(&priv->lock, flags);
806 room = kfifo_avail(&priv->write_fifo);
807 spin_unlock_irqrestore(&priv->lock, flags);
808
809 dev_dbg(&port->dev, "%s - returns %d\n", __func__, room);
810 return room;
811 }
812
813
cypress_tiocmget(struct tty_struct * tty)814 static int cypress_tiocmget(struct tty_struct *tty)
815 {
816 struct usb_serial_port *port = tty->driver_data;
817 struct cypress_private *priv = usb_get_serial_port_data(port);
818 __u8 status, control;
819 unsigned int result = 0;
820 unsigned long flags;
821
822 spin_lock_irqsave(&priv->lock, flags);
823 control = priv->line_control;
824 status = priv->current_status;
825 spin_unlock_irqrestore(&priv->lock, flags);
826
827 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
828 | ((control & CONTROL_RTS) ? TIOCM_RTS : 0)
829 | ((status & UART_CTS) ? TIOCM_CTS : 0)
830 | ((status & UART_DSR) ? TIOCM_DSR : 0)
831 | ((status & UART_RI) ? TIOCM_RI : 0)
832 | ((status & UART_CD) ? TIOCM_CD : 0);
833
834 dev_dbg(&port->dev, "%s - result = %x\n", __func__, result);
835
836 return result;
837 }
838
839
cypress_tiocmset(struct tty_struct * tty,unsigned int set,unsigned int clear)840 static int cypress_tiocmset(struct tty_struct *tty,
841 unsigned int set, unsigned int clear)
842 {
843 struct usb_serial_port *port = tty->driver_data;
844 struct cypress_private *priv = usb_get_serial_port_data(port);
845 unsigned long flags;
846
847 spin_lock_irqsave(&priv->lock, flags);
848 if (set & TIOCM_RTS)
849 priv->line_control |= CONTROL_RTS;
850 if (set & TIOCM_DTR)
851 priv->line_control |= CONTROL_DTR;
852 if (clear & TIOCM_RTS)
853 priv->line_control &= ~CONTROL_RTS;
854 if (clear & TIOCM_DTR)
855 priv->line_control &= ~CONTROL_DTR;
856 priv->cmd_ctrl = 1;
857 spin_unlock_irqrestore(&priv->lock, flags);
858
859 return cypress_write(tty, port, NULL, 0);
860 }
861
cypress_set_termios(struct tty_struct * tty,struct usb_serial_port * port,struct ktermios * old_termios)862 static void cypress_set_termios(struct tty_struct *tty,
863 struct usb_serial_port *port, struct ktermios *old_termios)
864 {
865 struct cypress_private *priv = usb_get_serial_port_data(port);
866 struct device *dev = &port->dev;
867 int data_bits, stop_bits, parity_type, parity_enable;
868 unsigned cflag, iflag;
869 unsigned long flags;
870 __u8 oldlines;
871 int linechange = 0;
872
873 spin_lock_irqsave(&priv->lock, flags);
874 /* We can't clean this one up as we don't know the device type
875 early enough */
876 if (!priv->termios_initialized) {
877 if (priv->chiptype == CT_EARTHMATE) {
878 tty->termios = tty_std_termios;
879 tty->termios.c_cflag = B4800 | CS8 | CREAD | HUPCL |
880 CLOCAL;
881 tty->termios.c_ispeed = 4800;
882 tty->termios.c_ospeed = 4800;
883 } else if (priv->chiptype == CT_CYPHIDCOM) {
884 tty->termios = tty_std_termios;
885 tty->termios.c_cflag = B9600 | CS8 | CREAD | HUPCL |
886 CLOCAL;
887 tty->termios.c_ispeed = 9600;
888 tty->termios.c_ospeed = 9600;
889 } else if (priv->chiptype == CT_CA42V2) {
890 tty->termios = tty_std_termios;
891 tty->termios.c_cflag = B9600 | CS8 | CREAD | HUPCL |
892 CLOCAL;
893 tty->termios.c_ispeed = 9600;
894 tty->termios.c_ospeed = 9600;
895 }
896 priv->termios_initialized = 1;
897 }
898 spin_unlock_irqrestore(&priv->lock, flags);
899
900 /* Unsupported features need clearing */
901 tty->termios.c_cflag &= ~(CMSPAR|CRTSCTS);
902
903 cflag = tty->termios.c_cflag;
904 iflag = tty->termios.c_iflag;
905
906 /* check if there are new settings */
907 if (old_termios) {
908 spin_lock_irqsave(&priv->lock, flags);
909 priv->tmp_termios = tty->termios;
910 spin_unlock_irqrestore(&priv->lock, flags);
911 }
912
913 /* set number of data bits, parity, stop bits */
914 /* when parity is disabled the parity type bit is ignored */
915
916 /* 1 means 2 stop bits, 0 means 1 stop bit */
917 stop_bits = cflag & CSTOPB ? 1 : 0;
918
919 if (cflag & PARENB) {
920 parity_enable = 1;
921 /* 1 means odd parity, 0 means even parity */
922 parity_type = cflag & PARODD ? 1 : 0;
923 } else
924 parity_enable = parity_type = 0;
925
926 switch (cflag & CSIZE) {
927 case CS5:
928 data_bits = 0;
929 break;
930 case CS6:
931 data_bits = 1;
932 break;
933 case CS7:
934 data_bits = 2;
935 break;
936 case CS8:
937 data_bits = 3;
938 break;
939 default:
940 dev_err(dev, "%s - CSIZE was set, but not CS5-CS8\n", __func__);
941 data_bits = 3;
942 }
943 spin_lock_irqsave(&priv->lock, flags);
944 oldlines = priv->line_control;
945 if ((cflag & CBAUD) == B0) {
946 /* drop dtr and rts */
947 dev_dbg(dev, "%s - dropping the lines, baud rate 0bps\n", __func__);
948 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
949 } else
950 priv->line_control = (CONTROL_DTR | CONTROL_RTS);
951 spin_unlock_irqrestore(&priv->lock, flags);
952
953 dev_dbg(dev, "%s - sending %d stop_bits, %d parity_enable, %d parity_type, %d data_bits (+5)\n",
954 __func__, stop_bits, parity_enable, parity_type, data_bits);
955
956 cypress_serial_control(tty, port, tty_get_baud_rate(tty),
957 data_bits, stop_bits,
958 parity_enable, parity_type,
959 0, CYPRESS_SET_CONFIG);
960
961 /* we perform a CYPRESS_GET_CONFIG so that the current settings are
962 * filled into the private structure this should confirm that all is
963 * working if it returns what we just set */
964 cypress_serial_control(tty, port, 0, 0, 0, 0, 0, 0, CYPRESS_GET_CONFIG);
965
966 /* Here we can define custom tty settings for devices; the main tty
967 * termios flag base comes from empeg.c */
968
969 spin_lock_irqsave(&priv->lock, flags);
970 if (priv->chiptype == CT_EARTHMATE && priv->baud_rate == 4800) {
971 dev_dbg(dev, "Using custom termios settings for a baud rate of 4800bps.\n");
972 /* define custom termios settings for NMEA protocol */
973
974 tty->termios.c_iflag /* input modes - */
975 &= ~(IGNBRK /* disable ignore break */
976 | BRKINT /* disable break causes interrupt */
977 | PARMRK /* disable mark parity errors */
978 | ISTRIP /* disable clear high bit of input char */
979 | INLCR /* disable translate NL to CR */
980 | IGNCR /* disable ignore CR */
981 | ICRNL /* disable translate CR to NL */
982 | IXON); /* disable enable XON/XOFF flow control */
983
984 tty->termios.c_oflag /* output modes */
985 &= ~OPOST; /* disable postprocess output char */
986
987 tty->termios.c_lflag /* line discipline modes */
988 &= ~(ECHO /* disable echo input characters */
989 | ECHONL /* disable echo new line */
990 | ICANON /* disable erase, kill, werase, and rprnt
991 special characters */
992 | ISIG /* disable interrupt, quit, and suspend
993 special characters */
994 | IEXTEN); /* disable non-POSIX special characters */
995 } /* CT_CYPHIDCOM: Application should handle this for device */
996
997 linechange = (priv->line_control != oldlines);
998 spin_unlock_irqrestore(&priv->lock, flags);
999
1000 /* if necessary, set lines */
1001 if (linechange) {
1002 priv->cmd_ctrl = 1;
1003 cypress_write(tty, port, NULL, 0);
1004 }
1005 } /* cypress_set_termios */
1006
1007
1008 /* returns amount of data still left in soft buffer */
cypress_chars_in_buffer(struct tty_struct * tty)1009 static int cypress_chars_in_buffer(struct tty_struct *tty)
1010 {
1011 struct usb_serial_port *port = tty->driver_data;
1012 struct cypress_private *priv = usb_get_serial_port_data(port);
1013 int chars = 0;
1014 unsigned long flags;
1015
1016 spin_lock_irqsave(&priv->lock, flags);
1017 chars = kfifo_len(&priv->write_fifo);
1018 spin_unlock_irqrestore(&priv->lock, flags);
1019
1020 dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
1021 return chars;
1022 }
1023
1024
cypress_throttle(struct tty_struct * tty)1025 static void cypress_throttle(struct tty_struct *tty)
1026 {
1027 struct usb_serial_port *port = tty->driver_data;
1028 struct cypress_private *priv = usb_get_serial_port_data(port);
1029
1030 spin_lock_irq(&priv->lock);
1031 priv->rx_flags = THROTTLED;
1032 spin_unlock_irq(&priv->lock);
1033 }
1034
1035
cypress_unthrottle(struct tty_struct * tty)1036 static void cypress_unthrottle(struct tty_struct *tty)
1037 {
1038 struct usb_serial_port *port = tty->driver_data;
1039 struct cypress_private *priv = usb_get_serial_port_data(port);
1040 int actually_throttled, result;
1041
1042 spin_lock_irq(&priv->lock);
1043 actually_throttled = priv->rx_flags & ACTUALLY_THROTTLED;
1044 priv->rx_flags = 0;
1045 spin_unlock_irq(&priv->lock);
1046
1047 if (!priv->comm_is_ok)
1048 return;
1049
1050 if (actually_throttled) {
1051 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
1052 if (result) {
1053 dev_err(&port->dev, "%s - failed submitting read urb, "
1054 "error %d\n", __func__, result);
1055 cypress_set_dead(port);
1056 }
1057 }
1058 }
1059
1060
cypress_read_int_callback(struct urb * urb)1061 static void cypress_read_int_callback(struct urb *urb)
1062 {
1063 struct usb_serial_port *port = urb->context;
1064 struct cypress_private *priv = usb_get_serial_port_data(port);
1065 struct device *dev = &urb->dev->dev;
1066 struct tty_struct *tty;
1067 unsigned char *data = urb->transfer_buffer;
1068 unsigned long flags;
1069 char tty_flag = TTY_NORMAL;
1070 int bytes = 0;
1071 int result;
1072 int i = 0;
1073 int status = urb->status;
1074
1075 switch (status) {
1076 case 0: /* success */
1077 break;
1078 case -ECONNRESET:
1079 case -ENOENT:
1080 case -ESHUTDOWN:
1081 /* precursor to disconnect so just go away */
1082 return;
1083 case -EPIPE:
1084 /* Can't call usb_clear_halt while in_interrupt */
1085 /* FALLS THROUGH */
1086 default:
1087 /* something ugly is going on... */
1088 dev_err(dev, "%s - unexpected nonzero read status received: %d\n",
1089 __func__, status);
1090 cypress_set_dead(port);
1091 return;
1092 }
1093
1094 spin_lock_irqsave(&priv->lock, flags);
1095 if (priv->rx_flags & THROTTLED) {
1096 dev_dbg(dev, "%s - now throttling\n", __func__);
1097 priv->rx_flags |= ACTUALLY_THROTTLED;
1098 spin_unlock_irqrestore(&priv->lock, flags);
1099 return;
1100 }
1101 spin_unlock_irqrestore(&priv->lock, flags);
1102
1103 tty = tty_port_tty_get(&port->port);
1104 if (!tty) {
1105 dev_dbg(dev, "%s - bad tty pointer - exiting\n", __func__);
1106 return;
1107 }
1108
1109 spin_lock_irqsave(&priv->lock, flags);
1110 result = urb->actual_length;
1111 switch (priv->pkt_fmt) {
1112 default:
1113 case packet_format_1:
1114 /* This is for the CY7C64013... */
1115 priv->current_status = data[0] & 0xF8;
1116 bytes = data[1] + 2;
1117 i = 2;
1118 break;
1119 case packet_format_2:
1120 /* This is for the CY7C63743... */
1121 priv->current_status = data[0] & 0xF8;
1122 bytes = (data[0] & 0x07) + 1;
1123 i = 1;
1124 break;
1125 }
1126 spin_unlock_irqrestore(&priv->lock, flags);
1127 if (result < bytes) {
1128 dev_dbg(dev,
1129 "%s - wrong packet size - received %d bytes but packet said %d bytes\n",
1130 __func__, result, bytes);
1131 goto continue_read;
1132 }
1133
1134 usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
1135
1136 spin_lock_irqsave(&priv->lock, flags);
1137 /* check to see if status has changed */
1138 if (priv->current_status != priv->prev_status) {
1139 u8 delta = priv->current_status ^ priv->prev_status;
1140
1141 if (delta & UART_MSR_MASK) {
1142 if (delta & UART_CTS)
1143 port->icount.cts++;
1144 if (delta & UART_DSR)
1145 port->icount.dsr++;
1146 if (delta & UART_RI)
1147 port->icount.rng++;
1148 if (delta & UART_CD)
1149 port->icount.dcd++;
1150
1151 wake_up_interruptible(&port->port.delta_msr_wait);
1152 }
1153
1154 priv->prev_status = priv->current_status;
1155 }
1156 spin_unlock_irqrestore(&priv->lock, flags);
1157
1158 /* hangup, as defined in acm.c... this might be a bad place for it
1159 * though */
1160 if (tty && !C_CLOCAL(tty) && !(priv->current_status & UART_CD)) {
1161 dev_dbg(dev, "%s - calling hangup\n", __func__);
1162 tty_hangup(tty);
1163 goto continue_read;
1164 }
1165
1166 /* There is one error bit... I'm assuming it is a parity error
1167 * indicator as the generic firmware will set this bit to 1 if a
1168 * parity error occurs.
1169 * I can not find reference to any other error events. */
1170 spin_lock_irqsave(&priv->lock, flags);
1171 if (priv->current_status & CYP_ERROR) {
1172 spin_unlock_irqrestore(&priv->lock, flags);
1173 tty_flag = TTY_PARITY;
1174 dev_dbg(dev, "%s - Parity Error detected\n", __func__);
1175 } else
1176 spin_unlock_irqrestore(&priv->lock, flags);
1177
1178 /* process read if there is data other than line status */
1179 if (bytes > i) {
1180 tty_insert_flip_string_fixed_flag(&port->port, data + i,
1181 tty_flag, bytes - i);
1182 tty_flip_buffer_push(&port->port);
1183 }
1184
1185 spin_lock_irqsave(&priv->lock, flags);
1186 /* control and status byte(s) are also counted */
1187 priv->bytes_in += bytes;
1188 spin_unlock_irqrestore(&priv->lock, flags);
1189
1190 continue_read:
1191 tty_kref_put(tty);
1192
1193 /* Continue trying to always read */
1194
1195 if (priv->comm_is_ok) {
1196 usb_fill_int_urb(port->interrupt_in_urb, port->serial->dev,
1197 usb_rcvintpipe(port->serial->dev,
1198 port->interrupt_in_endpointAddress),
1199 port->interrupt_in_urb->transfer_buffer,
1200 port->interrupt_in_urb->transfer_buffer_length,
1201 cypress_read_int_callback, port,
1202 priv->read_urb_interval);
1203 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
1204 if (result && result != -EPERM) {
1205 dev_err(dev, "%s - failed resubmitting read urb, error %d\n",
1206 __func__, result);
1207 cypress_set_dead(port);
1208 }
1209 }
1210 } /* cypress_read_int_callback */
1211
1212
cypress_write_int_callback(struct urb * urb)1213 static void cypress_write_int_callback(struct urb *urb)
1214 {
1215 struct usb_serial_port *port = urb->context;
1216 struct cypress_private *priv = usb_get_serial_port_data(port);
1217 struct device *dev = &urb->dev->dev;
1218 int status = urb->status;
1219
1220 switch (status) {
1221 case 0:
1222 /* success */
1223 break;
1224 case -ECONNRESET:
1225 case -ENOENT:
1226 case -ESHUTDOWN:
1227 /* this urb is terminated, clean up */
1228 dev_dbg(dev, "%s - urb shutting down with status: %d\n",
1229 __func__, status);
1230 priv->write_urb_in_use = 0;
1231 return;
1232 case -EPIPE:
1233 /* Cannot call usb_clear_halt while in_interrupt */
1234 /* FALLTHROUGH */
1235 default:
1236 dev_err(dev, "%s - unexpected nonzero write status received: %d\n",
1237 __func__, status);
1238 cypress_set_dead(port);
1239 break;
1240 }
1241 priv->write_urb_in_use = 0;
1242
1243 /* send any buffered data */
1244 cypress_send(port);
1245 }
1246
1247 module_usb_serial_driver(serial_drivers, id_table_combined);
1248
1249 MODULE_AUTHOR(DRIVER_AUTHOR);
1250 MODULE_DESCRIPTION(DRIVER_DESC);
1251 MODULE_LICENSE("GPL");
1252
1253 module_param(stats, bool, S_IRUGO | S_IWUSR);
1254 MODULE_PARM_DESC(stats, "Enable statistics or not");
1255 module_param(interval, int, S_IRUGO | S_IWUSR);
1256 MODULE_PARM_DESC(interval, "Overrides interrupt interval");
1257 module_param(unstable_bauds, bool, S_IRUGO | S_IWUSR);
1258 MODULE_PARM_DESC(unstable_bauds, "Allow unstable baud rates");
1259