1 /*
2 * USB Cypress M8 driver
3 *
4 * Copyright (C) 2004
5 * Lonnie Mendez (dignome@gmail.com)
6 * Copyright (C) 2003,2004
7 * Neil Whelchel (koyama@firstlight.net)
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * See Documentation/usb/usb-serial.txt for more information on using this
15 * driver
16 *
17 * See http://geocities.com/i0xox0i for information on this driver and the
18 * earthmate usb device.
19 */
20
21 /* Thanks to Neil Whelchel for writing the first cypress m8 implementation
22 for linux. */
23 /* Thanks to cypress for providing references for the hid reports. */
24 /* Thanks to Jiang Zhang for providing links and for general help. */
25 /* Code originates and was built up from ftdi_sio, belkin, pl2303 and others.*/
26
27
28 #include <linux/kernel.h>
29 #include <linux/errno.h>
30 #include <linux/init.h>
31 #include <linux/slab.h>
32 #include <linux/tty.h>
33 #include <linux/tty_driver.h>
34 #include <linux/tty_flip.h>
35 #include <linux/module.h>
36 #include <linux/moduleparam.h>
37 #include <linux/spinlock.h>
38 #include <linux/usb.h>
39 #include <linux/usb/serial.h>
40 #include <linux/serial.h>
41 #include <linux/kfifo.h>
42 #include <linux/delay.h>
43 #include <linux/uaccess.h>
44 #include <asm/unaligned.h>
45
46 #include "cypress_m8.h"
47
48
49 static bool stats;
50 static int interval;
51 static bool unstable_bauds;
52
53 #define DRIVER_AUTHOR "Lonnie Mendez <dignome@gmail.com>, Neil Whelchel <koyama@firstlight.net>"
54 #define DRIVER_DESC "Cypress USB to Serial Driver"
55
56 /* write buffer size defines */
57 #define CYPRESS_BUF_SIZE 1024
58
59 static const struct usb_device_id id_table_earthmate[] = {
60 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
61 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
62 { } /* Terminating entry */
63 };
64
65 static const struct usb_device_id id_table_cyphidcomrs232[] = {
66 { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
67 { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) },
68 { USB_DEVICE(VENDOR_ID_FRWD, PRODUCT_ID_CYPHIDCOM_FRWD) },
69 { } /* Terminating entry */
70 };
71
72 static const struct usb_device_id id_table_nokiaca42v2[] = {
73 { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
74 { } /* Terminating entry */
75 };
76
77 static const struct usb_device_id id_table_combined[] = {
78 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
79 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
80 { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
81 { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) },
82 { USB_DEVICE(VENDOR_ID_FRWD, PRODUCT_ID_CYPHIDCOM_FRWD) },
83 { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
84 { } /* Terminating entry */
85 };
86
87 MODULE_DEVICE_TABLE(usb, id_table_combined);
88
89 enum packet_format {
90 packet_format_1, /* b0:status, b1:payload count */
91 packet_format_2 /* b0[7:3]:status, b0[2:0]:payload count */
92 };
93
94 struct cypress_private {
95 spinlock_t lock; /* private lock */
96 int chiptype; /* identifier of device, for quirks/etc */
97 int bytes_in; /* used for statistics */
98 int bytes_out; /* used for statistics */
99 int cmd_count; /* used for statistics */
100 int cmd_ctrl; /* always set this to 1 before issuing a command */
101 struct kfifo write_fifo; /* write fifo */
102 int write_urb_in_use; /* write urb in use indicator */
103 int write_urb_interval; /* interval to use for write urb */
104 int read_urb_interval; /* interval to use for read urb */
105 int comm_is_ok; /* true if communication is (still) ok */
106 int termios_initialized;
107 __u8 line_control; /* holds dtr / rts value */
108 __u8 current_status; /* received from last read - info on dsr,cts,cd,ri,etc */
109 __u8 current_config; /* stores the current configuration byte */
110 __u8 rx_flags; /* throttling - used from whiteheat/ftdi_sio */
111 enum packet_format pkt_fmt; /* format to use for packet send / receive */
112 int get_cfg_unsafe; /* If true, the CYPRESS_GET_CONFIG is unsafe */
113 int baud_rate; /* stores current baud rate in
114 integer form */
115 int isthrottled; /* if throttled, discard reads */
116 char prev_status, diff_status; /* used for TIOCMIWAIT */
117 /* we pass a pointer to this as the argument sent to
118 cypress_set_termios old_termios */
119 struct ktermios tmp_termios; /* stores the old termios settings */
120 };
121
122 /* function prototypes for the Cypress USB to serial device */
123 static int cypress_earthmate_port_probe(struct usb_serial_port *port);
124 static int cypress_hidcom_port_probe(struct usb_serial_port *port);
125 static int cypress_ca42v2_port_probe(struct usb_serial_port *port);
126 static int cypress_port_remove(struct usb_serial_port *port);
127 static int cypress_open(struct tty_struct *tty, struct usb_serial_port *port);
128 static void cypress_close(struct usb_serial_port *port);
129 static void cypress_dtr_rts(struct usb_serial_port *port, int on);
130 static int cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
131 const unsigned char *buf, int count);
132 static void cypress_send(struct usb_serial_port *port);
133 static int cypress_write_room(struct tty_struct *tty);
134 static void cypress_set_termios(struct tty_struct *tty,
135 struct usb_serial_port *port, struct ktermios *old);
136 static int cypress_tiocmget(struct tty_struct *tty);
137 static int cypress_tiocmset(struct tty_struct *tty,
138 unsigned int set, unsigned int clear);
139 static int cypress_tiocmiwait(struct tty_struct *tty, unsigned long arg);
140 static int cypress_chars_in_buffer(struct tty_struct *tty);
141 static void cypress_throttle(struct tty_struct *tty);
142 static void cypress_unthrottle(struct tty_struct *tty);
143 static void cypress_set_dead(struct usb_serial_port *port);
144 static void cypress_read_int_callback(struct urb *urb);
145 static void cypress_write_int_callback(struct urb *urb);
146
147 static struct usb_serial_driver cypress_earthmate_device = {
148 .driver = {
149 .owner = THIS_MODULE,
150 .name = "earthmate",
151 },
152 .description = "DeLorme Earthmate USB",
153 .id_table = id_table_earthmate,
154 .num_ports = 1,
155 .port_probe = cypress_earthmate_port_probe,
156 .port_remove = cypress_port_remove,
157 .open = cypress_open,
158 .close = cypress_close,
159 .dtr_rts = cypress_dtr_rts,
160 .write = cypress_write,
161 .write_room = cypress_write_room,
162 .set_termios = cypress_set_termios,
163 .tiocmget = cypress_tiocmget,
164 .tiocmset = cypress_tiocmset,
165 .tiocmiwait = cypress_tiocmiwait,
166 .chars_in_buffer = cypress_chars_in_buffer,
167 .throttle = cypress_throttle,
168 .unthrottle = cypress_unthrottle,
169 .read_int_callback = cypress_read_int_callback,
170 .write_int_callback = cypress_write_int_callback,
171 };
172
173 static struct usb_serial_driver cypress_hidcom_device = {
174 .driver = {
175 .owner = THIS_MODULE,
176 .name = "cyphidcom",
177 },
178 .description = "HID->COM RS232 Adapter",
179 .id_table = id_table_cyphidcomrs232,
180 .num_ports = 1,
181 .port_probe = cypress_hidcom_port_probe,
182 .port_remove = cypress_port_remove,
183 .open = cypress_open,
184 .close = cypress_close,
185 .dtr_rts = cypress_dtr_rts,
186 .write = cypress_write,
187 .write_room = cypress_write_room,
188 .set_termios = cypress_set_termios,
189 .tiocmget = cypress_tiocmget,
190 .tiocmset = cypress_tiocmset,
191 .tiocmiwait = cypress_tiocmiwait,
192 .chars_in_buffer = cypress_chars_in_buffer,
193 .throttle = cypress_throttle,
194 .unthrottle = cypress_unthrottle,
195 .read_int_callback = cypress_read_int_callback,
196 .write_int_callback = cypress_write_int_callback,
197 };
198
199 static struct usb_serial_driver cypress_ca42v2_device = {
200 .driver = {
201 .owner = THIS_MODULE,
202 .name = "nokiaca42v2",
203 },
204 .description = "Nokia CA-42 V2 Adapter",
205 .id_table = id_table_nokiaca42v2,
206 .num_ports = 1,
207 .port_probe = cypress_ca42v2_port_probe,
208 .port_remove = cypress_port_remove,
209 .open = cypress_open,
210 .close = cypress_close,
211 .dtr_rts = cypress_dtr_rts,
212 .write = cypress_write,
213 .write_room = cypress_write_room,
214 .set_termios = cypress_set_termios,
215 .tiocmget = cypress_tiocmget,
216 .tiocmset = cypress_tiocmset,
217 .tiocmiwait = cypress_tiocmiwait,
218 .chars_in_buffer = cypress_chars_in_buffer,
219 .throttle = cypress_throttle,
220 .unthrottle = cypress_unthrottle,
221 .read_int_callback = cypress_read_int_callback,
222 .write_int_callback = cypress_write_int_callback,
223 };
224
225 static struct usb_serial_driver * const serial_drivers[] = {
226 &cypress_earthmate_device, &cypress_hidcom_device,
227 &cypress_ca42v2_device, NULL
228 };
229
230 /*****************************************************************************
231 * Cypress serial helper functions
232 *****************************************************************************/
233
234 /* FRWD Dongle hidcom needs to skip reset and speed checks */
is_frwd(struct usb_device * dev)235 static inline bool is_frwd(struct usb_device *dev)
236 {
237 return ((le16_to_cpu(dev->descriptor.idVendor) == VENDOR_ID_FRWD) &&
238 (le16_to_cpu(dev->descriptor.idProduct) == PRODUCT_ID_CYPHIDCOM_FRWD));
239 }
240
analyze_baud_rate(struct usb_serial_port * port,speed_t new_rate)241 static int analyze_baud_rate(struct usb_serial_port *port, speed_t new_rate)
242 {
243 struct cypress_private *priv;
244 priv = usb_get_serial_port_data(port);
245
246 if (unstable_bauds)
247 return new_rate;
248
249 /* FRWD Dongle uses 115200 bps */
250 if (is_frwd(port->serial->dev))
251 return new_rate;
252
253 /*
254 * The general purpose firmware for the Cypress M8 allows for
255 * a maximum speed of 57600bps (I have no idea whether DeLorme
256 * chose to use the general purpose firmware or not), if you
257 * need to modify this speed setting for your own project
258 * please add your own chiptype and modify the code likewise.
259 * The Cypress HID->COM device will work successfully up to
260 * 115200bps (but the actual throughput is around 3kBps).
261 */
262 if (port->serial->dev->speed == USB_SPEED_LOW) {
263 /*
264 * Mike Isely <isely@pobox.com> 2-Feb-2008: The
265 * Cypress app note that describes this mechanism
266 * states the the low-speed part can't handle more
267 * than 800 bytes/sec, in which case 4800 baud is the
268 * safest speed for a part like that.
269 */
270 if (new_rate > 4800) {
271 dev_dbg(&port->dev,
272 "%s - failed setting baud rate, device incapable speed %d\n",
273 __func__, new_rate);
274 return -1;
275 }
276 }
277 switch (priv->chiptype) {
278 case CT_EARTHMATE:
279 if (new_rate <= 600) {
280 /* 300 and 600 baud rates are supported under
281 * the generic firmware, but are not used with
282 * NMEA and SiRF protocols */
283 dev_dbg(&port->dev,
284 "%s - failed setting baud rate, unsupported speed of %d on Earthmate GPS",
285 __func__, new_rate);
286 return -1;
287 }
288 break;
289 default:
290 break;
291 }
292 return new_rate;
293 }
294
295
296 /* This function can either set or retrieve the current serial line settings */
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)297 static int cypress_serial_control(struct tty_struct *tty,
298 struct usb_serial_port *port, speed_t baud_rate, int data_bits,
299 int stop_bits, int parity_enable, int parity_type, int reset,
300 int cypress_request_type)
301 {
302 int new_baudrate = 0, retval = 0, tries = 0;
303 struct cypress_private *priv;
304 struct device *dev = &port->dev;
305 u8 *feature_buffer;
306 const unsigned int feature_len = 5;
307 unsigned long flags;
308
309 priv = usb_get_serial_port_data(port);
310
311 if (!priv->comm_is_ok)
312 return -ENODEV;
313
314 feature_buffer = kcalloc(feature_len, sizeof(u8), GFP_KERNEL);
315 if (!feature_buffer)
316 return -ENOMEM;
317
318 switch (cypress_request_type) {
319 case CYPRESS_SET_CONFIG:
320 /* 0 means 'Hang up' so doesn't change the true bit rate */
321 new_baudrate = priv->baud_rate;
322 if (baud_rate && baud_rate != priv->baud_rate) {
323 dev_dbg(dev, "%s - baud rate is changing\n", __func__);
324 retval = analyze_baud_rate(port, baud_rate);
325 if (retval >= 0) {
326 new_baudrate = retval;
327 dev_dbg(dev, "%s - New baud rate set to %d\n",
328 __func__, new_baudrate);
329 }
330 }
331 dev_dbg(dev, "%s - baud rate is being sent as %d\n", __func__,
332 new_baudrate);
333
334 /* fill the feature_buffer with new configuration */
335 put_unaligned_le32(new_baudrate, feature_buffer);
336 feature_buffer[4] |= data_bits; /* assign data bits in 2 bit space ( max 3 ) */
337 /* 1 bit gap */
338 feature_buffer[4] |= (stop_bits << 3); /* assign stop bits in 1 bit space */
339 feature_buffer[4] |= (parity_enable << 4); /* assign parity flag in 1 bit space */
340 feature_buffer[4] |= (parity_type << 5); /* assign parity type in 1 bit space */
341 /* 1 bit gap */
342 feature_buffer[4] |= (reset << 7); /* assign reset at end of byte, 1 bit space */
343
344 dev_dbg(dev, "%s - device is being sent this feature report:\n", __func__);
345 dev_dbg(dev, "%s - %02X - %02X - %02X - %02X - %02X\n", __func__,
346 feature_buffer[0], feature_buffer[1],
347 feature_buffer[2], feature_buffer[3],
348 feature_buffer[4]);
349
350 do {
351 retval = usb_control_msg(port->serial->dev,
352 usb_sndctrlpipe(port->serial->dev, 0),
353 HID_REQ_SET_REPORT,
354 USB_DIR_OUT | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
355 0x0300, 0, feature_buffer,
356 feature_len, 500);
357
358 if (tries++ >= 3)
359 break;
360
361 } while (retval != feature_len &&
362 retval != -ENODEV);
363
364 if (retval != feature_len) {
365 dev_err(dev, "%s - failed sending serial line settings - %d\n",
366 __func__, retval);
367 cypress_set_dead(port);
368 } else {
369 spin_lock_irqsave(&priv->lock, flags);
370 priv->baud_rate = new_baudrate;
371 priv->current_config = feature_buffer[4];
372 spin_unlock_irqrestore(&priv->lock, flags);
373 /* If we asked for a speed change encode it */
374 if (baud_rate)
375 tty_encode_baud_rate(tty,
376 new_baudrate, new_baudrate);
377 }
378 break;
379 case CYPRESS_GET_CONFIG:
380 if (priv->get_cfg_unsafe) {
381 /* Not implemented for this device,
382 and if we try to do it we're likely
383 to crash the hardware. */
384 retval = -ENOTTY;
385 goto out;
386 }
387 dev_dbg(dev, "%s - retreiving serial line settings\n", __func__);
388 do {
389 retval = usb_control_msg(port->serial->dev,
390 usb_rcvctrlpipe(port->serial->dev, 0),
391 HID_REQ_GET_REPORT,
392 USB_DIR_IN | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
393 0x0300, 0, feature_buffer,
394 feature_len, 500);
395
396 if (tries++ >= 3)
397 break;
398 } while (retval != feature_len
399 && retval != -ENODEV);
400
401 if (retval != feature_len) {
402 dev_err(dev, "%s - failed to retrieve serial line settings - %d\n",
403 __func__, retval);
404 cypress_set_dead(port);
405 goto out;
406 } else {
407 spin_lock_irqsave(&priv->lock, flags);
408 /* store the config in one byte, and later
409 use bit masks to check values */
410 priv->current_config = feature_buffer[4];
411 priv->baud_rate = get_unaligned_le32(feature_buffer);
412 spin_unlock_irqrestore(&priv->lock, flags);
413 }
414 }
415 spin_lock_irqsave(&priv->lock, flags);
416 ++priv->cmd_count;
417 spin_unlock_irqrestore(&priv->lock, flags);
418 out:
419 kfree(feature_buffer);
420 return retval;
421 } /* cypress_serial_control */
422
423
cypress_set_dead(struct usb_serial_port * port)424 static void cypress_set_dead(struct usb_serial_port *port)
425 {
426 struct cypress_private *priv = usb_get_serial_port_data(port);
427 unsigned long flags;
428
429 spin_lock_irqsave(&priv->lock, flags);
430 if (!priv->comm_is_ok) {
431 spin_unlock_irqrestore(&priv->lock, flags);
432 return;
433 }
434 priv->comm_is_ok = 0;
435 spin_unlock_irqrestore(&priv->lock, flags);
436
437 dev_err(&port->dev, "cypress_m8 suspending failing port %d - "
438 "interval might be too short\n", port->number);
439 }
440
441
442 /*****************************************************************************
443 * Cypress serial driver functions
444 *****************************************************************************/
445
446
cypress_generic_port_probe(struct usb_serial_port * port)447 static int cypress_generic_port_probe(struct usb_serial_port *port)
448 {
449 struct usb_serial *serial = port->serial;
450 struct cypress_private *priv;
451
452 if (!port->interrupt_out_urb || !port->interrupt_in_urb) {
453 dev_err(&port->dev, "required endpoint is missing\n");
454 return -ENODEV;
455 }
456
457 priv = kzalloc(sizeof(struct cypress_private), GFP_KERNEL);
458 if (!priv)
459 return -ENOMEM;
460
461 priv->comm_is_ok = !0;
462 spin_lock_init(&priv->lock);
463 if (kfifo_alloc(&priv->write_fifo, CYPRESS_BUF_SIZE, GFP_KERNEL)) {
464 kfree(priv);
465 return -ENOMEM;
466 }
467
468 /* Skip reset for FRWD device. It is a workaound:
469 device hangs if it receives SET_CONFIGURE in Configured
470 state. */
471 if (!is_frwd(serial->dev))
472 usb_reset_configuration(serial->dev);
473
474 priv->cmd_ctrl = 0;
475 priv->line_control = 0;
476 priv->termios_initialized = 0;
477 priv->rx_flags = 0;
478 /* Default packet format setting is determined by packet size.
479 Anything with a size larger then 9 must have a separate
480 count field since the 3 bit count field is otherwise too
481 small. Otherwise we can use the slightly more compact
482 format. This is in accordance with the cypress_m8 serial
483 converter app note. */
484 if (port->interrupt_out_size > 9)
485 priv->pkt_fmt = packet_format_1;
486 else
487 priv->pkt_fmt = packet_format_2;
488
489 if (interval > 0) {
490 priv->write_urb_interval = interval;
491 priv->read_urb_interval = interval;
492 dev_dbg(&port->dev, "%s - read & write intervals forced to %d\n",
493 __func__, interval);
494 } else {
495 priv->write_urb_interval = port->interrupt_out_urb->interval;
496 priv->read_urb_interval = port->interrupt_in_urb->interval;
497 dev_dbg(&port->dev, "%s - intervals: read=%d write=%d\n",
498 __func__, priv->read_urb_interval,
499 priv->write_urb_interval);
500 }
501 usb_set_serial_port_data(port, priv);
502
503 return 0;
504 }
505
506
cypress_earthmate_port_probe(struct usb_serial_port * port)507 static int cypress_earthmate_port_probe(struct usb_serial_port *port)
508 {
509 struct usb_serial *serial = port->serial;
510 struct cypress_private *priv;
511 int ret;
512
513 ret = cypress_generic_port_probe(port);
514 if (ret) {
515 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
516 return ret;
517 }
518
519 priv = usb_get_serial_port_data(port);
520 priv->chiptype = CT_EARTHMATE;
521 /* All Earthmate devices use the separated-count packet
522 format! Idiotic. */
523 priv->pkt_fmt = packet_format_1;
524 if (serial->dev->descriptor.idProduct !=
525 cpu_to_le16(PRODUCT_ID_EARTHMATEUSB)) {
526 /* The old original USB Earthmate seemed able to
527 handle GET_CONFIG requests; everything they've
528 produced since that time crashes if this command is
529 attempted :-( */
530 dev_dbg(&port->dev,
531 "%s - Marking this device as unsafe for GET_CONFIG commands\n",
532 __func__);
533 priv->get_cfg_unsafe = !0;
534 }
535
536 return 0;
537 }
538
cypress_hidcom_port_probe(struct usb_serial_port * port)539 static int cypress_hidcom_port_probe(struct usb_serial_port *port)
540 {
541 struct cypress_private *priv;
542 int ret;
543
544 ret = cypress_generic_port_probe(port);
545 if (ret) {
546 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
547 return ret;
548 }
549
550 priv = usb_get_serial_port_data(port);
551 priv->chiptype = CT_CYPHIDCOM;
552
553 return 0;
554 }
555
cypress_ca42v2_port_probe(struct usb_serial_port * port)556 static int cypress_ca42v2_port_probe(struct usb_serial_port *port)
557 {
558 struct cypress_private *priv;
559 int ret;
560
561 ret = cypress_generic_port_probe(port);
562 if (ret) {
563 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
564 return ret;
565 }
566
567 priv = usb_get_serial_port_data(port);
568 priv->chiptype = CT_CA42V2;
569
570 return 0;
571 }
572
cypress_port_remove(struct usb_serial_port * port)573 static int cypress_port_remove(struct usb_serial_port *port)
574 {
575 struct cypress_private *priv;
576
577 priv = usb_get_serial_port_data(port);
578
579 kfifo_free(&priv->write_fifo);
580 kfree(priv);
581
582 return 0;
583 }
584
cypress_open(struct tty_struct * tty,struct usb_serial_port * port)585 static int cypress_open(struct tty_struct *tty, struct usb_serial_port *port)
586 {
587 struct cypress_private *priv = usb_get_serial_port_data(port);
588 struct usb_serial *serial = port->serial;
589 unsigned long flags;
590 int result = 0;
591
592 if (!priv->comm_is_ok)
593 return -EIO;
594
595 /* clear halts before open */
596 usb_clear_halt(serial->dev, 0x81);
597 usb_clear_halt(serial->dev, 0x02);
598
599 spin_lock_irqsave(&priv->lock, flags);
600 /* reset read/write statistics */
601 priv->bytes_in = 0;
602 priv->bytes_out = 0;
603 priv->cmd_count = 0;
604 priv->rx_flags = 0;
605 spin_unlock_irqrestore(&priv->lock, flags);
606
607 /* Set termios */
608 cypress_send(port);
609
610 if (tty)
611 cypress_set_termios(tty, port, &priv->tmp_termios);
612
613 /* setup the port and start reading from the device */
614 usb_fill_int_urb(port->interrupt_in_urb, serial->dev,
615 usb_rcvintpipe(serial->dev, port->interrupt_in_endpointAddress),
616 port->interrupt_in_urb->transfer_buffer,
617 port->interrupt_in_urb->transfer_buffer_length,
618 cypress_read_int_callback, port, priv->read_urb_interval);
619 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
620
621 if (result) {
622 dev_err(&port->dev,
623 "%s - failed submitting read urb, error %d\n",
624 __func__, result);
625 cypress_set_dead(port);
626 }
627 port->port.drain_delay = 256;
628 return result;
629 } /* cypress_open */
630
cypress_dtr_rts(struct usb_serial_port * port,int on)631 static void cypress_dtr_rts(struct usb_serial_port *port, int on)
632 {
633 struct cypress_private *priv = usb_get_serial_port_data(port);
634 /* drop dtr and rts */
635 spin_lock_irq(&priv->lock);
636 if (on == 0)
637 priv->line_control = 0;
638 else
639 priv->line_control = CONTROL_DTR | CONTROL_RTS;
640 priv->cmd_ctrl = 1;
641 spin_unlock_irq(&priv->lock);
642 cypress_write(NULL, port, NULL, 0);
643 }
644
cypress_close(struct usb_serial_port * port)645 static void cypress_close(struct usb_serial_port *port)
646 {
647 struct cypress_private *priv = usb_get_serial_port_data(port);
648 unsigned long flags;
649
650 spin_lock_irqsave(&priv->lock, flags);
651 kfifo_reset_out(&priv->write_fifo);
652 spin_unlock_irqrestore(&priv->lock, flags);
653
654 dev_dbg(&port->dev, "%s - stopping urbs\n", __func__);
655 usb_kill_urb(port->interrupt_in_urb);
656 usb_kill_urb(port->interrupt_out_urb);
657
658 if (stats)
659 dev_info(&port->dev, "Statistics: %d Bytes In | %d Bytes Out | %d Commands Issued\n",
660 priv->bytes_in, priv->bytes_out, priv->cmd_count);
661 } /* cypress_close */
662
663
cypress_write(struct tty_struct * tty,struct usb_serial_port * port,const unsigned char * buf,int count)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
cypress_send(struct usb_serial_port * port)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 */
cypress_write_room(struct tty_struct * tty)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
cypress_tiocmget(struct tty_struct * tty)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
cypress_tiocmset(struct tty_struct * tty,unsigned int set,unsigned int clear)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
cypress_tiocmiwait(struct tty_struct * tty,unsigned long arg)865 static int cypress_tiocmiwait(struct tty_struct *tty, unsigned long arg)
866 {
867 struct usb_serial_port *port = tty->driver_data;
868 struct cypress_private *priv = usb_get_serial_port_data(port);
869 char diff;
870
871 for (;;) {
872 interruptible_sleep_on(&port->port.delta_msr_wait);
873 /* see if a signal did it */
874 if (signal_pending(current))
875 return -ERESTARTSYS;
876
877 if (port->serial->disconnected)
878 return -EIO;
879
880 diff = priv->diff_status;
881 if (diff == 0)
882 return -EIO; /* no change => error */
883
884 /* consume all events */
885 priv->diff_status = 0;
886
887 /* return 0 if caller wanted to know about
888 these bits */
889 if (((arg & TIOCM_RNG) && (diff & UART_RI)) ||
890 ((arg & TIOCM_DSR) && (diff & UART_DSR)) ||
891 ((arg & TIOCM_CD) && (diff & UART_CD)) ||
892 ((arg & TIOCM_CTS) && (diff & UART_CTS)))
893 return 0;
894 /* otherwise caller can't care less about what
895 * happened, and so we continue to wait for
896 * more events.
897 */
898 }
899
900 return 0;
901 }
902
cypress_set_termios(struct tty_struct * tty,struct usb_serial_port * port,struct ktermios * old_termios)903 static void cypress_set_termios(struct tty_struct *tty,
904 struct usb_serial_port *port, struct ktermios *old_termios)
905 {
906 struct cypress_private *priv = usb_get_serial_port_data(port);
907 struct device *dev = &port->dev;
908 int data_bits, stop_bits, parity_type, parity_enable;
909 unsigned cflag, iflag;
910 unsigned long flags;
911 __u8 oldlines;
912 int linechange = 0;
913
914 spin_lock_irqsave(&priv->lock, flags);
915 /* We can't clean this one up as we don't know the device type
916 early enough */
917 if (!priv->termios_initialized) {
918 if (priv->chiptype == CT_EARTHMATE) {
919 tty->termios = tty_std_termios;
920 tty->termios.c_cflag = B4800 | CS8 | CREAD | HUPCL |
921 CLOCAL;
922 tty->termios.c_ispeed = 4800;
923 tty->termios.c_ospeed = 4800;
924 } else if (priv->chiptype == CT_CYPHIDCOM) {
925 tty->termios = tty_std_termios;
926 tty->termios.c_cflag = B9600 | CS8 | CREAD | HUPCL |
927 CLOCAL;
928 tty->termios.c_ispeed = 9600;
929 tty->termios.c_ospeed = 9600;
930 } else if (priv->chiptype == CT_CA42V2) {
931 tty->termios = tty_std_termios;
932 tty->termios.c_cflag = B9600 | CS8 | CREAD | HUPCL |
933 CLOCAL;
934 tty->termios.c_ispeed = 9600;
935 tty->termios.c_ospeed = 9600;
936 }
937 priv->termios_initialized = 1;
938 }
939 spin_unlock_irqrestore(&priv->lock, flags);
940
941 /* Unsupported features need clearing */
942 tty->termios.c_cflag &= ~(CMSPAR|CRTSCTS);
943
944 cflag = tty->termios.c_cflag;
945 iflag = tty->termios.c_iflag;
946
947 /* check if there are new settings */
948 if (old_termios) {
949 spin_lock_irqsave(&priv->lock, flags);
950 priv->tmp_termios = tty->termios;
951 spin_unlock_irqrestore(&priv->lock, flags);
952 }
953
954 /* set number of data bits, parity, stop bits */
955 /* when parity is disabled the parity type bit is ignored */
956
957 /* 1 means 2 stop bits, 0 means 1 stop bit */
958 stop_bits = cflag & CSTOPB ? 1 : 0;
959
960 if (cflag & PARENB) {
961 parity_enable = 1;
962 /* 1 means odd parity, 0 means even parity */
963 parity_type = cflag & PARODD ? 1 : 0;
964 } else
965 parity_enable = parity_type = 0;
966
967 switch (cflag & CSIZE) {
968 case CS5:
969 data_bits = 0;
970 break;
971 case CS6:
972 data_bits = 1;
973 break;
974 case CS7:
975 data_bits = 2;
976 break;
977 case CS8:
978 data_bits = 3;
979 break;
980 default:
981 dev_err(dev, "%s - CSIZE was set, but not CS5-CS8\n", __func__);
982 data_bits = 3;
983 }
984 spin_lock_irqsave(&priv->lock, flags);
985 oldlines = priv->line_control;
986 if ((cflag & CBAUD) == B0) {
987 /* drop dtr and rts */
988 dev_dbg(dev, "%s - dropping the lines, baud rate 0bps\n", __func__);
989 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
990 } else
991 priv->line_control = (CONTROL_DTR | CONTROL_RTS);
992 spin_unlock_irqrestore(&priv->lock, flags);
993
994 dev_dbg(dev, "%s - sending %d stop_bits, %d parity_enable, %d parity_type, %d data_bits (+5)\n",
995 __func__, stop_bits, parity_enable, parity_type, data_bits);
996
997 cypress_serial_control(tty, port, tty_get_baud_rate(tty),
998 data_bits, stop_bits,
999 parity_enable, parity_type,
1000 0, CYPRESS_SET_CONFIG);
1001
1002 /* we perform a CYPRESS_GET_CONFIG so that the current settings are
1003 * filled into the private structure this should confirm that all is
1004 * working if it returns what we just set */
1005 cypress_serial_control(tty, port, 0, 0, 0, 0, 0, 0, CYPRESS_GET_CONFIG);
1006
1007 /* Here we can define custom tty settings for devices; the main tty
1008 * termios flag base comes from empeg.c */
1009
1010 spin_lock_irqsave(&priv->lock, flags);
1011 if (priv->chiptype == CT_EARTHMATE && priv->baud_rate == 4800) {
1012 dev_dbg(dev, "Using custom termios settings for a baud rate of 4800bps.\n");
1013 /* define custom termios settings for NMEA protocol */
1014
1015 tty->termios.c_iflag /* input modes - */
1016 &= ~(IGNBRK /* disable ignore break */
1017 | BRKINT /* disable break causes interrupt */
1018 | PARMRK /* disable mark parity errors */
1019 | ISTRIP /* disable clear high bit of input char */
1020 | INLCR /* disable translate NL to CR */
1021 | IGNCR /* disable ignore CR */
1022 | ICRNL /* disable translate CR to NL */
1023 | IXON); /* disable enable XON/XOFF flow control */
1024
1025 tty->termios.c_oflag /* output modes */
1026 &= ~OPOST; /* disable postprocess output char */
1027
1028 tty->termios.c_lflag /* line discipline modes */
1029 &= ~(ECHO /* disable echo input characters */
1030 | ECHONL /* disable echo new line */
1031 | ICANON /* disable erase, kill, werase, and rprnt
1032 special characters */
1033 | ISIG /* disable interrupt, quit, and suspend
1034 special characters */
1035 | IEXTEN); /* disable non-POSIX special characters */
1036 } /* CT_CYPHIDCOM: Application should handle this for device */
1037
1038 linechange = (priv->line_control != oldlines);
1039 spin_unlock_irqrestore(&priv->lock, flags);
1040
1041 /* if necessary, set lines */
1042 if (linechange) {
1043 priv->cmd_ctrl = 1;
1044 cypress_write(tty, port, NULL, 0);
1045 }
1046 } /* cypress_set_termios */
1047
1048
1049 /* returns amount of data still left in soft buffer */
cypress_chars_in_buffer(struct tty_struct * tty)1050 static int cypress_chars_in_buffer(struct tty_struct *tty)
1051 {
1052 struct usb_serial_port *port = tty->driver_data;
1053 struct cypress_private *priv = usb_get_serial_port_data(port);
1054 int chars = 0;
1055 unsigned long flags;
1056
1057 spin_lock_irqsave(&priv->lock, flags);
1058 chars = kfifo_len(&priv->write_fifo);
1059 spin_unlock_irqrestore(&priv->lock, flags);
1060
1061 dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
1062 return chars;
1063 }
1064
1065
cypress_throttle(struct tty_struct * tty)1066 static void cypress_throttle(struct tty_struct *tty)
1067 {
1068 struct usb_serial_port *port = tty->driver_data;
1069 struct cypress_private *priv = usb_get_serial_port_data(port);
1070
1071 spin_lock_irq(&priv->lock);
1072 priv->rx_flags = THROTTLED;
1073 spin_unlock_irq(&priv->lock);
1074 }
1075
1076
cypress_unthrottle(struct tty_struct * tty)1077 static void cypress_unthrottle(struct tty_struct *tty)
1078 {
1079 struct usb_serial_port *port = tty->driver_data;
1080 struct cypress_private *priv = usb_get_serial_port_data(port);
1081 int actually_throttled, result;
1082
1083 spin_lock_irq(&priv->lock);
1084 actually_throttled = priv->rx_flags & ACTUALLY_THROTTLED;
1085 priv->rx_flags = 0;
1086 spin_unlock_irq(&priv->lock);
1087
1088 if (!priv->comm_is_ok)
1089 return;
1090
1091 if (actually_throttled) {
1092 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
1093 if (result) {
1094 dev_err(&port->dev, "%s - failed submitting read urb, "
1095 "error %d\n", __func__, result);
1096 cypress_set_dead(port);
1097 }
1098 }
1099 }
1100
1101
cypress_read_int_callback(struct urb * urb)1102 static void cypress_read_int_callback(struct urb *urb)
1103 {
1104 struct usb_serial_port *port = urb->context;
1105 struct cypress_private *priv = usb_get_serial_port_data(port);
1106 struct device *dev = &urb->dev->dev;
1107 struct tty_struct *tty;
1108 unsigned char *data = urb->transfer_buffer;
1109 unsigned long flags;
1110 char tty_flag = TTY_NORMAL;
1111 int havedata = 0;
1112 int bytes = 0;
1113 int result;
1114 int i = 0;
1115 int status = urb->status;
1116
1117 switch (status) {
1118 case 0: /* success */
1119 break;
1120 case -ECONNRESET:
1121 case -ENOENT:
1122 case -ESHUTDOWN:
1123 /* precursor to disconnect so just go away */
1124 return;
1125 case -EPIPE:
1126 /* Can't call usb_clear_halt while in_interrupt */
1127 /* FALLS THROUGH */
1128 default:
1129 /* something ugly is going on... */
1130 dev_err(dev, "%s - unexpected nonzero read status received: %d\n",
1131 __func__, status);
1132 cypress_set_dead(port);
1133 return;
1134 }
1135
1136 spin_lock_irqsave(&priv->lock, flags);
1137 if (priv->rx_flags & THROTTLED) {
1138 dev_dbg(dev, "%s - now throttling\n", __func__);
1139 priv->rx_flags |= ACTUALLY_THROTTLED;
1140 spin_unlock_irqrestore(&priv->lock, flags);
1141 return;
1142 }
1143 spin_unlock_irqrestore(&priv->lock, flags);
1144
1145 tty = tty_port_tty_get(&port->port);
1146 if (!tty) {
1147 dev_dbg(dev, "%s - bad tty pointer - exiting\n", __func__);
1148 return;
1149 }
1150
1151 spin_lock_irqsave(&priv->lock, flags);
1152 result = urb->actual_length;
1153 switch (priv->pkt_fmt) {
1154 default:
1155 case packet_format_1:
1156 /* This is for the CY7C64013... */
1157 priv->current_status = data[0] & 0xF8;
1158 bytes = data[1] + 2;
1159 i = 2;
1160 if (bytes > 2)
1161 havedata = 1;
1162 break;
1163 case packet_format_2:
1164 /* This is for the CY7C63743... */
1165 priv->current_status = data[0] & 0xF8;
1166 bytes = (data[0] & 0x07) + 1;
1167 i = 1;
1168 if (bytes > 1)
1169 havedata = 1;
1170 break;
1171 }
1172 spin_unlock_irqrestore(&priv->lock, flags);
1173 if (result < bytes) {
1174 dev_dbg(dev,
1175 "%s - wrong packet size - received %d bytes but packet said %d bytes\n",
1176 __func__, result, bytes);
1177 goto continue_read;
1178 }
1179
1180 usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
1181
1182 spin_lock_irqsave(&priv->lock, flags);
1183 /* check to see if status has changed */
1184 if (priv->current_status != priv->prev_status) {
1185 priv->diff_status |= priv->current_status ^
1186 priv->prev_status;
1187 wake_up_interruptible(&port->port.delta_msr_wait);
1188 priv->prev_status = priv->current_status;
1189 }
1190 spin_unlock_irqrestore(&priv->lock, flags);
1191
1192 /* hangup, as defined in acm.c... this might be a bad place for it
1193 * though */
1194 if (tty && !(tty->termios.c_cflag & CLOCAL) &&
1195 !(priv->current_status & UART_CD)) {
1196 dev_dbg(dev, "%s - calling hangup\n", __func__);
1197 tty_hangup(tty);
1198 goto continue_read;
1199 }
1200
1201 /* There is one error bit... I'm assuming it is a parity error
1202 * indicator as the generic firmware will set this bit to 1 if a
1203 * parity error occurs.
1204 * I can not find reference to any other error events. */
1205 spin_lock_irqsave(&priv->lock, flags);
1206 if (priv->current_status & CYP_ERROR) {
1207 spin_unlock_irqrestore(&priv->lock, flags);
1208 tty_flag = TTY_PARITY;
1209 dev_dbg(dev, "%s - Parity Error detected\n", __func__);
1210 } else
1211 spin_unlock_irqrestore(&priv->lock, flags);
1212
1213 /* process read if there is data other than line status */
1214 if (bytes > i) {
1215 tty_insert_flip_string_fixed_flag(&port->port, data + i,
1216 tty_flag, bytes - i);
1217 tty_flip_buffer_push(&port->port);
1218 }
1219
1220 spin_lock_irqsave(&priv->lock, flags);
1221 /* control and status byte(s) are also counted */
1222 priv->bytes_in += bytes;
1223 spin_unlock_irqrestore(&priv->lock, flags);
1224
1225 continue_read:
1226 tty_kref_put(tty);
1227
1228 /* Continue trying to always read */
1229
1230 if (priv->comm_is_ok) {
1231 usb_fill_int_urb(port->interrupt_in_urb, port->serial->dev,
1232 usb_rcvintpipe(port->serial->dev,
1233 port->interrupt_in_endpointAddress),
1234 port->interrupt_in_urb->transfer_buffer,
1235 port->interrupt_in_urb->transfer_buffer_length,
1236 cypress_read_int_callback, port,
1237 priv->read_urb_interval);
1238 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
1239 if (result && result != -EPERM) {
1240 dev_err(dev, "%s - failed resubmitting read urb, error %d\n",
1241 __func__, result);
1242 cypress_set_dead(port);
1243 }
1244 }
1245 } /* cypress_read_int_callback */
1246
1247
cypress_write_int_callback(struct urb * urb)1248 static void cypress_write_int_callback(struct urb *urb)
1249 {
1250 struct usb_serial_port *port = urb->context;
1251 struct cypress_private *priv = usb_get_serial_port_data(port);
1252 struct device *dev = &urb->dev->dev;
1253 int result;
1254 int status = urb->status;
1255
1256 switch (status) {
1257 case 0:
1258 /* success */
1259 break;
1260 case -ECONNRESET:
1261 case -ENOENT:
1262 case -ESHUTDOWN:
1263 /* this urb is terminated, clean up */
1264 dev_dbg(dev, "%s - urb shutting down with status: %d\n",
1265 __func__, status);
1266 priv->write_urb_in_use = 0;
1267 return;
1268 case -EPIPE: /* no break needed; clear halt and resubmit */
1269 if (!priv->comm_is_ok)
1270 break;
1271 usb_clear_halt(port->serial->dev, 0x02);
1272 /* error in the urb, so we have to resubmit it */
1273 dev_dbg(dev, "%s - nonzero write bulk status received: %d\n",
1274 __func__, status);
1275 port->interrupt_out_urb->transfer_buffer_length = 1;
1276 result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC);
1277 if (!result)
1278 return;
1279 dev_err(dev, "%s - failed resubmitting write urb, error %d\n",
1280 __func__, result);
1281 cypress_set_dead(port);
1282 break;
1283 default:
1284 dev_err(dev, "%s - unexpected nonzero write status received: %d\n",
1285 __func__, status);
1286 cypress_set_dead(port);
1287 break;
1288 }
1289 priv->write_urb_in_use = 0;
1290
1291 /* send any buffered data */
1292 cypress_send(port);
1293 }
1294
1295 module_usb_serial_driver(serial_drivers, id_table_combined);
1296
1297 MODULE_AUTHOR(DRIVER_AUTHOR);
1298 MODULE_DESCRIPTION(DRIVER_DESC);
1299 MODULE_LICENSE("GPL");
1300
1301 module_param(stats, bool, S_IRUGO | S_IWUSR);
1302 MODULE_PARM_DESC(stats, "Enable statistics or not");
1303 module_param(interval, int, S_IRUGO | S_IWUSR);
1304 MODULE_PARM_DESC(interval, "Overrides interrupt interval");
1305 module_param(unstable_bauds, bool, S_IRUGO | S_IWUSR);
1306 MODULE_PARM_DESC(unstable_bauds, "Allow unstable baud rates");
1307