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[deliverable/linux.git] / drivers / usb / serial / cypress_m8.c
1 /*
2 * USB Cypress M8 driver
3 *
4 * Copyright (C) 2004
5 * Lonnie Mendez (dignome@gmail.com)
6 * Copyright (C) 2003,2004
7 * Neil Whelchel (koyama@firstlight.net)
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * See Documentation/usb/usb-serial.txt for more information on using this
15 * driver
16 *
17 * See http://geocities.com/i0xox0i for information on this driver and the
18 * earthmate usb device.
19 *
20 * Lonnie Mendez <dignome@gmail.com>
21 * 4-29-2005
22 * Fixed problem where setting or retreiving the serial config would fail
23 * with EPIPE. Removed CRTS toggling so the driver behaves more like
24 * other usbserial adapters. Issued new interval of 1ms instead of the
25 * default 10ms. As a result, transfer speed has been substantially
26 * increased from avg. 850bps to avg. 3300bps. initial termios has also
27 * been modified. Cleaned up code and formatting issues so it is more
28 * readable. Replaced the C++ style comments.
29 *
30 * Lonnie Mendez <dignome@gmail.com>
31 * 12-15-2004
32 * Incorporated write buffering from pl2303 driver. Fixed bug with line
33 * handling so both lines are raised in cypress_open. (was dropping rts)
34 * Various code cleanups made as well along with other misc bug fixes.
35 *
36 * Lonnie Mendez <dignome@gmail.com>
37 * 04-10-2004
38 * Driver modified to support dynamic line settings. Various improvments
39 * and features.
40 *
41 * Neil Whelchel
42 * 10-2003
43 * Driver first released.
44 *
45 */
46
47 /* Thanks to Neil Whelchel for writing the first cypress m8 implementation
48 for linux. */
49 /* Thanks to cypress for providing references for the hid reports. */
50 /* Thanks to Jiang Zhang for providing links and for general help. */
51 /* Code originates and was built up from ftdi_sio, belkin, pl2303 and others.*/
52
53
54 #include <linux/kernel.h>
55 #include <linux/errno.h>
56 #include <linux/init.h>
57 #include <linux/slab.h>
58 #include <linux/tty.h>
59 #include <linux/tty_driver.h>
60 #include <linux/tty_flip.h>
61 #include <linux/module.h>
62 #include <linux/moduleparam.h>
63 #include <linux/spinlock.h>
64 #include <linux/usb.h>
65 #include <linux/usb/serial.h>
66 #include <linux/serial.h>
67 #include <linux/delay.h>
68 #include <linux/uaccess.h>
69
70 #include "cypress_m8.h"
71
72
73 #ifdef CONFIG_USB_SERIAL_DEBUG
74 static int debug = 1;
75 #else
76 static int debug;
77 #endif
78 static int stats;
79 static int interval;
80
81 /*
82 * Version Information
83 */
84 #define DRIVER_VERSION "v1.09"
85 #define DRIVER_AUTHOR "Lonnie Mendez <dignome@gmail.com>, Neil Whelchel <koyama@firstlight.net>"
86 #define DRIVER_DESC "Cypress USB to Serial Driver"
87
88 /* write buffer size defines */
89 #define CYPRESS_BUF_SIZE 1024
90 #define CYPRESS_CLOSING_WAIT (30*HZ)
91
92 static struct usb_device_id id_table_earthmate [] = {
93 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
94 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
95 { } /* Terminating entry */
96 };
97
98 static struct usb_device_id id_table_cyphidcomrs232 [] = {
99 { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
100 { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) },
101 { } /* Terminating entry */
102 };
103
104 static struct usb_device_id id_table_nokiaca42v2 [] = {
105 { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
106 { } /* Terminating entry */
107 };
108
109 static struct usb_device_id id_table_combined [] = {
110 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
111 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
112 { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
113 { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) },
114 { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
115 { } /* Terminating entry */
116 };
117
118 MODULE_DEVICE_TABLE(usb, id_table_combined);
119
120 static struct usb_driver cypress_driver = {
121 .name = "cypress",
122 .probe = usb_serial_probe,
123 .disconnect = usb_serial_disconnect,
124 .id_table = id_table_combined,
125 .no_dynamic_id = 1,
126 };
127
128 enum packet_format {
129 packet_format_1, /* b0:status, b1:payload count */
130 packet_format_2 /* b0[7:3]:status, b0[2:0]:payload count */
131 };
132
133 struct cypress_private {
134 spinlock_t lock; /* private lock */
135 int chiptype; /* identifier of device, for quirks/etc */
136 int bytes_in; /* used for statistics */
137 int bytes_out; /* used for statistics */
138 int cmd_count; /* used for statistics */
139 int cmd_ctrl; /* always set this to 1 before issuing a command */
140 struct cypress_buf *buf; /* write buffer */
141 int write_urb_in_use; /* write urb in use indicator */
142 int write_urb_interval; /* interval to use for write urb */
143 int read_urb_interval; /* interval to use for read urb */
144 int comm_is_ok; /* true if communication is (still) ok */
145 int termios_initialized;
146 __u8 line_control; /* holds dtr / rts value */
147 __u8 current_status; /* received from last read - info on dsr,cts,cd,ri,etc */
148 __u8 current_config; /* stores the current configuration byte */
149 __u8 rx_flags; /* throttling - used from whiteheat/ftdi_sio */
150 enum packet_format pkt_fmt; /* format to use for packet send / receive */
151 int get_cfg_unsafe; /* If true, the CYPRESS_GET_CONFIG is unsafe */
152 int baud_rate; /* stores current baud rate in
153 integer form */
154 int isthrottled; /* if throttled, discard reads */
155 wait_queue_head_t delta_msr_wait; /* used for TIOCMIWAIT */
156 char prev_status, diff_status; /* used for TIOCMIWAIT */
157 /* we pass a pointer to this as the arguement sent to
158 cypress_set_termios old_termios */
159 struct ktermios tmp_termios; /* stores the old termios settings */
160 };
161
162 /* write buffer structure */
163 struct cypress_buf {
164 unsigned int buf_size;
165 char *buf_buf;
166 char *buf_get;
167 char *buf_put;
168 };
169
170 /* function prototypes for the Cypress USB to serial device */
171 static int cypress_earthmate_startup(struct usb_serial *serial);
172 static int cypress_hidcom_startup(struct usb_serial *serial);
173 static int cypress_ca42v2_startup(struct usb_serial *serial);
174 static void cypress_release(struct usb_serial *serial);
175 static int cypress_open(struct tty_struct *tty,
176 struct usb_serial_port *port, struct file *filp);
177 static void cypress_close(struct usb_serial_port *port);
178 static void cypress_dtr_rts(struct usb_serial_port *port, int on);
179 static int cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
180 const unsigned char *buf, int count);
181 static void cypress_send(struct usb_serial_port *port);
182 static int cypress_write_room(struct tty_struct *tty);
183 static int cypress_ioctl(struct tty_struct *tty, struct file *file,
184 unsigned int cmd, unsigned long arg);
185 static void cypress_set_termios(struct tty_struct *tty,
186 struct usb_serial_port *port, struct ktermios *old);
187 static int cypress_tiocmget(struct tty_struct *tty, struct file *file);
188 static int cypress_tiocmset(struct tty_struct *tty, struct file *file,
189 unsigned int set, unsigned int clear);
190 static int cypress_chars_in_buffer(struct tty_struct *tty);
191 static void cypress_throttle(struct tty_struct *tty);
192 static void cypress_unthrottle(struct tty_struct *tty);
193 static void cypress_set_dead(struct usb_serial_port *port);
194 static void cypress_read_int_callback(struct urb *urb);
195 static void cypress_write_int_callback(struct urb *urb);
196 /* write buffer functions */
197 static struct cypress_buf *cypress_buf_alloc(unsigned int size);
198 static void cypress_buf_free(struct cypress_buf *cb);
199 static void cypress_buf_clear(struct cypress_buf *cb);
200 static unsigned int cypress_buf_data_avail(struct cypress_buf *cb);
201 static unsigned int cypress_buf_space_avail(struct cypress_buf *cb);
202 static unsigned int cypress_buf_put(struct cypress_buf *cb,
203 const char *buf, unsigned int count);
204 static unsigned int cypress_buf_get(struct cypress_buf *cb,
205 char *buf, unsigned int count);
206
207
208 static struct usb_serial_driver cypress_earthmate_device = {
209 .driver = {
210 .owner = THIS_MODULE,
211 .name = "earthmate",
212 },
213 .description = "DeLorme Earthmate USB",
214 .usb_driver = &cypress_driver,
215 .id_table = id_table_earthmate,
216 .num_ports = 1,
217 .attach = cypress_earthmate_startup,
218 .release = cypress_release,
219 .open = cypress_open,
220 .close = cypress_close,
221 .dtr_rts = cypress_dtr_rts,
222 .write = cypress_write,
223 .write_room = cypress_write_room,
224 .ioctl = cypress_ioctl,
225 .set_termios = cypress_set_termios,
226 .tiocmget = cypress_tiocmget,
227 .tiocmset = cypress_tiocmset,
228 .chars_in_buffer = cypress_chars_in_buffer,
229 .throttle = cypress_throttle,
230 .unthrottle = cypress_unthrottle,
231 .read_int_callback = cypress_read_int_callback,
232 .write_int_callback = cypress_write_int_callback,
233 };
234
235 static struct usb_serial_driver cypress_hidcom_device = {
236 .driver = {
237 .owner = THIS_MODULE,
238 .name = "cyphidcom",
239 },
240 .description = "HID->COM RS232 Adapter",
241 .usb_driver = &cypress_driver,
242 .id_table = id_table_cyphidcomrs232,
243 .num_ports = 1,
244 .attach = cypress_hidcom_startup,
245 .release = cypress_release,
246 .open = cypress_open,
247 .close = cypress_close,
248 .dtr_rts = cypress_dtr_rts,
249 .write = cypress_write,
250 .write_room = cypress_write_room,
251 .ioctl = cypress_ioctl,
252 .set_termios = cypress_set_termios,
253 .tiocmget = cypress_tiocmget,
254 .tiocmset = cypress_tiocmset,
255 .chars_in_buffer = cypress_chars_in_buffer,
256 .throttle = cypress_throttle,
257 .unthrottle = cypress_unthrottle,
258 .read_int_callback = cypress_read_int_callback,
259 .write_int_callback = cypress_write_int_callback,
260 };
261
262 static struct usb_serial_driver cypress_ca42v2_device = {
263 .driver = {
264 .owner = THIS_MODULE,
265 .name = "nokiaca42v2",
266 },
267 .description = "Nokia CA-42 V2 Adapter",
268 .usb_driver = &cypress_driver,
269 .id_table = id_table_nokiaca42v2,
270 .num_ports = 1,
271 .attach = cypress_ca42v2_startup,
272 .release = cypress_release,
273 .open = cypress_open,
274 .close = cypress_close,
275 .dtr_rts = cypress_dtr_rts,
276 .write = cypress_write,
277 .write_room = cypress_write_room,
278 .ioctl = cypress_ioctl,
279 .set_termios = cypress_set_termios,
280 .tiocmget = cypress_tiocmget,
281 .tiocmset = cypress_tiocmset,
282 .chars_in_buffer = cypress_chars_in_buffer,
283 .throttle = cypress_throttle,
284 .unthrottle = cypress_unthrottle,
285 .read_int_callback = cypress_read_int_callback,
286 .write_int_callback = cypress_write_int_callback,
287 };
288
289 /*****************************************************************************
290 * Cypress serial helper functions
291 *****************************************************************************/
292
293
294 static int analyze_baud_rate(struct usb_serial_port *port, speed_t new_rate)
295 {
296 struct cypress_private *priv;
297 priv = usb_get_serial_port_data(port);
298
299 /*
300 * The general purpose firmware for the Cypress M8 allows for
301 * a maximum speed of 57600bps (I have no idea whether DeLorme
302 * chose to use the general purpose firmware or not), if you
303 * need to modify this speed setting for your own project
304 * please add your own chiptype and modify the code likewise.
305 * The Cypress HID->COM device will work successfully up to
306 * 115200bps (but the actual throughput is around 3kBps).
307 */
308 if (port->serial->dev->speed == USB_SPEED_LOW) {
309 /*
310 * Mike Isely <isely@pobox.com> 2-Feb-2008: The
311 * Cypress app note that describes this mechanism
312 * states the the low-speed part can't handle more
313 * than 800 bytes/sec, in which case 4800 baud is the
314 * safest speed for a part like that.
315 */
316 if (new_rate > 4800) {
317 dbg("%s - failed setting baud rate, device incapable "
318 "speed %d", __func__, new_rate);
319 return -1;
320 }
321 }
322 switch (priv->chiptype) {
323 case CT_EARTHMATE:
324 if (new_rate <= 600) {
325 /* 300 and 600 baud rates are supported under
326 * the generic firmware, but are not used with
327 * NMEA and SiRF protocols */
328 dbg("%s - failed setting baud rate, unsupported speed "
329 "of %d on Earthmate GPS", __func__, new_rate);
330 return -1;
331 }
332 break;
333 default:
334 break;
335 }
336 return new_rate;
337 }
338
339
340 /* This function can either set or retrieve the current serial line settings */
341 static int cypress_serial_control(struct tty_struct *tty,
342 struct usb_serial_port *port, speed_t baud_rate, int data_bits,
343 int stop_bits, int parity_enable, int parity_type, int reset,
344 int cypress_request_type)
345 {
346 int new_baudrate = 0, retval = 0, tries = 0;
347 struct cypress_private *priv;
348 __u8 feature_buffer[5];
349 unsigned long flags;
350
351 dbg("%s", __func__);
352
353 priv = usb_get_serial_port_data(port);
354
355 if (!priv->comm_is_ok)
356 return -ENODEV;
357
358 switch (cypress_request_type) {
359 case CYPRESS_SET_CONFIG:
360 new_baudrate = priv->baud_rate;
361 /* 0 means 'Hang up' so doesn't change the true bit rate */
362 if (baud_rate == 0)
363 new_baudrate = priv->baud_rate;
364 /* Change of speed ? */
365 else if (baud_rate != priv->baud_rate) {
366 dbg("%s - baud rate is changing", __func__);
367 retval = analyze_baud_rate(port, baud_rate);
368 if (retval >= 0) {
369 new_baudrate = retval;
370 dbg("%s - New baud rate set to %d",
371 __func__, new_baudrate);
372 }
373 }
374 dbg("%s - baud rate is being sent as %d",
375 __func__, new_baudrate);
376
377 memset(feature_buffer, 0, sizeof(feature_buffer));
378 /* fill the feature_buffer with new configuration */
379 *((u_int32_t *)feature_buffer) = new_baudrate;
380 feature_buffer[4] |= data_bits; /* assign data bits in 2 bit space ( max 3 ) */
381 /* 1 bit gap */
382 feature_buffer[4] |= (stop_bits << 3); /* assign stop bits in 1 bit space */
383 feature_buffer[4] |= (parity_enable << 4); /* assign parity flag in 1 bit space */
384 feature_buffer[4] |= (parity_type << 5); /* assign parity type in 1 bit space */
385 /* 1 bit gap */
386 feature_buffer[4] |= (reset << 7); /* assign reset at end of byte, 1 bit space */
387
388 dbg("%s - device is being sent this feature report:",
389 __func__);
390 dbg("%s - %02X - %02X - %02X - %02X - %02X", __func__,
391 feature_buffer[0], feature_buffer[1],
392 feature_buffer[2], feature_buffer[3],
393 feature_buffer[4]);
394
395 do {
396 retval = usb_control_msg(port->serial->dev,
397 usb_sndctrlpipe(port->serial->dev, 0),
398 HID_REQ_SET_REPORT,
399 USB_DIR_OUT | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
400 0x0300, 0, feature_buffer,
401 sizeof(feature_buffer), 500);
402
403 if (tries++ >= 3)
404 break;
405
406 } while (retval != sizeof(feature_buffer) &&
407 retval != -ENODEV);
408
409 if (retval != sizeof(feature_buffer)) {
410 dev_err(&port->dev, "%s - failed sending serial "
411 "line settings - %d\n", __func__, retval);
412 cypress_set_dead(port);
413 } else {
414 spin_lock_irqsave(&priv->lock, flags);
415 priv->baud_rate = new_baudrate;
416 priv->current_config = feature_buffer[4];
417 spin_unlock_irqrestore(&priv->lock, flags);
418 /* If we asked for a speed change encode it */
419 if (baud_rate)
420 tty_encode_baud_rate(tty,
421 new_baudrate, new_baudrate);
422 }
423 break;
424 case CYPRESS_GET_CONFIG:
425 if (priv->get_cfg_unsafe) {
426 /* Not implemented for this device,
427 and if we try to do it we're likely
428 to crash the hardware. */
429 return -ENOTTY;
430 }
431 dbg("%s - retreiving serial line settings", __func__);
432 /* set initial values in feature buffer */
433 memset(feature_buffer, 0, sizeof(feature_buffer));
434
435 do {
436 retval = usb_control_msg(port->serial->dev,
437 usb_rcvctrlpipe(port->serial->dev, 0),
438 HID_REQ_GET_REPORT,
439 USB_DIR_IN | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
440 0x0300, 0, feature_buffer,
441 sizeof(feature_buffer), 500);
442
443 if (tries++ >= 3)
444 break;
445 } while (retval != sizeof(feature_buffer)
446 && retval != -ENODEV);
447
448 if (retval != sizeof(feature_buffer)) {
449 dev_err(&port->dev, "%s - failed to retrieve serial "
450 "line settings - %d\n", __func__, retval);
451 cypress_set_dead(port);
452 return retval;
453 } else {
454 spin_lock_irqsave(&priv->lock, flags);
455 /* store the config in one byte, and later
456 use bit masks to check values */
457 priv->current_config = feature_buffer[4];
458 priv->baud_rate = *((u_int32_t *)feature_buffer);
459 spin_unlock_irqrestore(&priv->lock, flags);
460 }
461 }
462 spin_lock_irqsave(&priv->lock, flags);
463 ++priv->cmd_count;
464 spin_unlock_irqrestore(&priv->lock, flags);
465
466 return retval;
467 } /* cypress_serial_control */
468
469
470 static void cypress_set_dead(struct usb_serial_port *port)
471 {
472 struct cypress_private *priv = usb_get_serial_port_data(port);
473 unsigned long flags;
474
475 spin_lock_irqsave(&priv->lock, flags);
476 if (!priv->comm_is_ok) {
477 spin_unlock_irqrestore(&priv->lock, flags);
478 return;
479 }
480 priv->comm_is_ok = 0;
481 spin_unlock_irqrestore(&priv->lock, flags);
482
483 dev_err(&port->dev, "cypress_m8 suspending failing port %d - "
484 "interval might be too short\n", port->number);
485 }
486
487
488 /*****************************************************************************
489 * Cypress serial driver functions
490 *****************************************************************************/
491
492
493 static int generic_startup(struct usb_serial *serial)
494 {
495 struct cypress_private *priv;
496 struct usb_serial_port *port = serial->port[0];
497
498 dbg("%s - port %d", __func__, port->number);
499
500 priv = kzalloc(sizeof(struct cypress_private), GFP_KERNEL);
501 if (!priv)
502 return -ENOMEM;
503
504 priv->comm_is_ok = !0;
505 spin_lock_init(&priv->lock);
506 priv->buf = cypress_buf_alloc(CYPRESS_BUF_SIZE);
507 if (priv->buf == NULL) {
508 kfree(priv);
509 return -ENOMEM;
510 }
511 init_waitqueue_head(&priv->delta_msr_wait);
512
513 usb_reset_configuration(serial->dev);
514
515 priv->cmd_ctrl = 0;
516 priv->line_control = 0;
517 priv->termios_initialized = 0;
518 priv->rx_flags = 0;
519 /* Default packet format setting is determined by packet size.
520 Anything with a size larger then 9 must have a separate
521 count field since the 3 bit count field is otherwise too
522 small. Otherwise we can use the slightly more compact
523 format. This is in accordance with the cypress_m8 serial
524 converter app note. */
525 if (port->interrupt_out_size > 9)
526 priv->pkt_fmt = packet_format_1;
527 else
528 priv->pkt_fmt = packet_format_2;
529
530 if (interval > 0) {
531 priv->write_urb_interval = interval;
532 priv->read_urb_interval = interval;
533 dbg("%s - port %d read & write intervals forced to %d",
534 __func__, port->number, interval);
535 } else {
536 priv->write_urb_interval = port->interrupt_out_urb->interval;
537 priv->read_urb_interval = port->interrupt_in_urb->interval;
538 dbg("%s - port %d intervals: read=%d write=%d",
539 __func__, port->number,
540 priv->read_urb_interval, priv->write_urb_interval);
541 }
542 usb_set_serial_port_data(port, priv);
543
544 return 0;
545 }
546
547
548 static int cypress_earthmate_startup(struct usb_serial *serial)
549 {
550 struct cypress_private *priv;
551 struct usb_serial_port *port = serial->port[0];
552
553 dbg("%s", __func__);
554
555 if (generic_startup(serial)) {
556 dbg("%s - Failed setting up port %d", __func__,
557 port->number);
558 return 1;
559 }
560
561 priv = usb_get_serial_port_data(port);
562 priv->chiptype = CT_EARTHMATE;
563 /* All Earthmate devices use the separated-count packet
564 format! Idiotic. */
565 priv->pkt_fmt = packet_format_1;
566 if (serial->dev->descriptor.idProduct !=
567 cpu_to_le16(PRODUCT_ID_EARTHMATEUSB)) {
568 /* The old original USB Earthmate seemed able to
569 handle GET_CONFIG requests; everything they've
570 produced since that time crashes if this command is
571 attempted :-( */
572 dbg("%s - Marking this device as unsafe for GET_CONFIG "
573 "commands", __func__);
574 priv->get_cfg_unsafe = !0;
575 }
576
577 return 0;
578 } /* cypress_earthmate_startup */
579
580
581 static int cypress_hidcom_startup(struct usb_serial *serial)
582 {
583 struct cypress_private *priv;
584
585 dbg("%s", __func__);
586
587 if (generic_startup(serial)) {
588 dbg("%s - Failed setting up port %d", __func__,
589 serial->port[0]->number);
590 return 1;
591 }
592
593 priv = usb_get_serial_port_data(serial->port[0]);
594 priv->chiptype = CT_CYPHIDCOM;
595
596 return 0;
597 } /* cypress_hidcom_startup */
598
599
600 static int cypress_ca42v2_startup(struct usb_serial *serial)
601 {
602 struct cypress_private *priv;
603
604 dbg("%s", __func__);
605
606 if (generic_startup(serial)) {
607 dbg("%s - Failed setting up port %d", __func__,
608 serial->port[0]->number);
609 return 1;
610 }
611
612 priv = usb_get_serial_port_data(serial->port[0]);
613 priv->chiptype = CT_CA42V2;
614
615 return 0;
616 } /* cypress_ca42v2_startup */
617
618
619 static void cypress_release(struct usb_serial *serial)
620 {
621 struct cypress_private *priv;
622
623 dbg("%s - port %d", __func__, serial->port[0]->number);
624
625 /* all open ports are closed at this point */
626
627 priv = usb_get_serial_port_data(serial->port[0]);
628
629 if (priv) {
630 cypress_buf_free(priv->buf);
631 kfree(priv);
632 }
633 }
634
635
636 static int cypress_open(struct tty_struct *tty,
637 struct usb_serial_port *port, struct file *filp)
638 {
639 struct cypress_private *priv = usb_get_serial_port_data(port);
640 struct usb_serial *serial = port->serial;
641 unsigned long flags;
642 int result = 0;
643
644 dbg("%s - port %d", __func__, port->number);
645
646 if (!priv->comm_is_ok)
647 return -EIO;
648
649 /* clear halts before open */
650 usb_clear_halt(serial->dev, 0x81);
651 usb_clear_halt(serial->dev, 0x02);
652
653 spin_lock_irqsave(&priv->lock, flags);
654 /* reset read/write statistics */
655 priv->bytes_in = 0;
656 priv->bytes_out = 0;
657 priv->cmd_count = 0;
658 priv->rx_flags = 0;
659 spin_unlock_irqrestore(&priv->lock, flags);
660
661 /* Set termios */
662 result = cypress_write(tty, port, NULL, 0);
663
664 if (result) {
665 dev_err(&port->dev,
666 "%s - failed setting the control lines - error %d\n",
667 __func__, result);
668 return result;
669 } else
670 dbg("%s - success setting the control lines", __func__);
671
672 if (tty)
673 cypress_set_termios(tty, port, &priv->tmp_termios);
674
675 /* setup the port and start reading from the device */
676 if (!port->interrupt_in_urb) {
677 dev_err(&port->dev, "%s - interrupt_in_urb is empty!\n",
678 __func__);
679 return -1;
680 }
681
682 usb_fill_int_urb(port->interrupt_in_urb, serial->dev,
683 usb_rcvintpipe(serial->dev, port->interrupt_in_endpointAddress),
684 port->interrupt_in_urb->transfer_buffer,
685 port->interrupt_in_urb->transfer_buffer_length,
686 cypress_read_int_callback, port, priv->read_urb_interval);
687 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
688
689 if (result) {
690 dev_err(&port->dev,
691 "%s - failed submitting read urb, error %d\n",
692 __func__, result);
693 cypress_set_dead(port);
694 }
695 port->port.drain_delay = 256;
696 return result;
697 } /* cypress_open */
698
699 static void cypress_dtr_rts(struct usb_serial_port *port, int on)
700 {
701 struct cypress_private *priv = usb_get_serial_port_data(port);
702 /* drop dtr and rts */
703 priv = usb_get_serial_port_data(port);
704 spin_lock_irq(&priv->lock);
705 if (on == 0)
706 priv->line_control = 0;
707 else
708 priv->line_control = CONTROL_DTR | CONTROL_RTS;
709 priv->cmd_ctrl = 1;
710 spin_unlock_irq(&priv->lock);
711 cypress_write(NULL, port, NULL, 0);
712 }
713
714 static void cypress_close(struct usb_serial_port *port)
715 {
716 struct cypress_private *priv = usb_get_serial_port_data(port);
717
718 dbg("%s - port %d", __func__, port->number);
719
720 /* writing is potentially harmful, lock must be taken */
721 mutex_lock(&port->serial->disc_mutex);
722 if (port->serial->disconnected) {
723 mutex_unlock(&port->serial->disc_mutex);
724 return;
725 }
726 cypress_buf_clear(priv->buf);
727 dbg("%s - stopping urbs", __func__);
728 usb_kill_urb(port->interrupt_in_urb);
729 usb_kill_urb(port->interrupt_out_urb);
730
731
732 if (stats)
733 dev_info(&port->dev, "Statistics: %d Bytes In | %d Bytes Out | %d Commands Issued\n",
734 priv->bytes_in, priv->bytes_out, priv->cmd_count);
735 mutex_unlock(&port->serial->disc_mutex);
736 } /* cypress_close */
737
738
739 static int cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
740 const unsigned char *buf, int count)
741 {
742 struct cypress_private *priv = usb_get_serial_port_data(port);
743 unsigned long flags;
744
745 dbg("%s - port %d, %d bytes", __func__, port->number, count);
746
747 /* line control commands, which need to be executed immediately,
748 are not put into the buffer for obvious reasons.
749 */
750 if (priv->cmd_ctrl) {
751 count = 0;
752 goto finish;
753 }
754
755 if (!count)
756 return count;
757
758 spin_lock_irqsave(&priv->lock, flags);
759 count = cypress_buf_put(priv->buf, buf, count);
760 spin_unlock_irqrestore(&priv->lock, flags);
761
762 finish:
763 cypress_send(port);
764
765 return count;
766 } /* cypress_write */
767
768
769 static void cypress_send(struct usb_serial_port *port)
770 {
771 int count = 0, result, offset, actual_size;
772 struct cypress_private *priv = usb_get_serial_port_data(port);
773 unsigned long flags;
774
775 if (!priv->comm_is_ok)
776 return;
777
778 dbg("%s - port %d", __func__, port->number);
779 dbg("%s - interrupt out size is %d", __func__,
780 port->interrupt_out_size);
781
782 spin_lock_irqsave(&priv->lock, flags);
783 if (priv->write_urb_in_use) {
784 dbg("%s - can't write, urb in use", __func__);
785 spin_unlock_irqrestore(&priv->lock, flags);
786 return;
787 }
788 spin_unlock_irqrestore(&priv->lock, flags);
789
790 /* clear buffer */
791 memset(port->interrupt_out_urb->transfer_buffer, 0,
792 port->interrupt_out_size);
793
794 spin_lock_irqsave(&priv->lock, flags);
795 switch (priv->pkt_fmt) {
796 default:
797 case packet_format_1:
798 /* this is for the CY7C64013... */
799 offset = 2;
800 port->interrupt_out_buffer[0] = priv->line_control;
801 break;
802 case packet_format_2:
803 /* this is for the CY7C63743... */
804 offset = 1;
805 port->interrupt_out_buffer[0] = priv->line_control;
806 break;
807 }
808
809 if (priv->line_control & CONTROL_RESET)
810 priv->line_control &= ~CONTROL_RESET;
811
812 if (priv->cmd_ctrl) {
813 priv->cmd_count++;
814 dbg("%s - line control command being issued", __func__);
815 spin_unlock_irqrestore(&priv->lock, flags);
816 goto send;
817 } else
818 spin_unlock_irqrestore(&priv->lock, flags);
819
820 count = cypress_buf_get(priv->buf, &port->interrupt_out_buffer[offset],
821 port->interrupt_out_size-offset);
822
823 if (count == 0)
824 return;
825
826 switch (priv->pkt_fmt) {
827 default:
828 case packet_format_1:
829 port->interrupt_out_buffer[1] = count;
830 break;
831 case packet_format_2:
832 port->interrupt_out_buffer[0] |= count;
833 }
834
835 dbg("%s - count is %d", __func__, count);
836
837 send:
838 spin_lock_irqsave(&priv->lock, flags);
839 priv->write_urb_in_use = 1;
840 spin_unlock_irqrestore(&priv->lock, flags);
841
842 if (priv->cmd_ctrl)
843 actual_size = 1;
844 else
845 actual_size = count +
846 (priv->pkt_fmt == packet_format_1 ? 2 : 1);
847
848 usb_serial_debug_data(debug, &port->dev, __func__,
849 port->interrupt_out_size,
850 port->interrupt_out_urb->transfer_buffer);
851
852 usb_fill_int_urb(port->interrupt_out_urb, port->serial->dev,
853 usb_sndintpipe(port->serial->dev, port->interrupt_out_endpointAddress),
854 port->interrupt_out_buffer, port->interrupt_out_size,
855 cypress_write_int_callback, port, priv->write_urb_interval);
856 result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC);
857 if (result) {
858 dev_err(&port->dev,
859 "%s - failed submitting write urb, error %d\n",
860 __func__, result);
861 priv->write_urb_in_use = 0;
862 cypress_set_dead(port);
863 }
864
865 spin_lock_irqsave(&priv->lock, flags);
866 if (priv->cmd_ctrl)
867 priv->cmd_ctrl = 0;
868
869 /* do not count the line control and size bytes */
870 priv->bytes_out += count;
871 spin_unlock_irqrestore(&priv->lock, flags);
872
873 usb_serial_port_softint(port);
874 } /* cypress_send */
875
876
877 /* returns how much space is available in the soft buffer */
878 static int cypress_write_room(struct tty_struct *tty)
879 {
880 struct usb_serial_port *port = tty->driver_data;
881 struct cypress_private *priv = usb_get_serial_port_data(port);
882 int room = 0;
883 unsigned long flags;
884
885 dbg("%s - port %d", __func__, port->number);
886
887 spin_lock_irqsave(&priv->lock, flags);
888 room = cypress_buf_space_avail(priv->buf);
889 spin_unlock_irqrestore(&priv->lock, flags);
890
891 dbg("%s - returns %d", __func__, room);
892 return room;
893 }
894
895
896 static int cypress_tiocmget(struct tty_struct *tty, struct file *file)
897 {
898 struct usb_serial_port *port = tty->driver_data;
899 struct cypress_private *priv = usb_get_serial_port_data(port);
900 __u8 status, control;
901 unsigned int result = 0;
902 unsigned long flags;
903
904 dbg("%s - port %d", __func__, port->number);
905
906 spin_lock_irqsave(&priv->lock, flags);
907 control = priv->line_control;
908 status = priv->current_status;
909 spin_unlock_irqrestore(&priv->lock, flags);
910
911 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
912 | ((control & CONTROL_RTS) ? TIOCM_RTS : 0)
913 | ((status & UART_CTS) ? TIOCM_CTS : 0)
914 | ((status & UART_DSR) ? TIOCM_DSR : 0)
915 | ((status & UART_RI) ? TIOCM_RI : 0)
916 | ((status & UART_CD) ? TIOCM_CD : 0);
917
918 dbg("%s - result = %x", __func__, result);
919
920 return result;
921 }
922
923
924 static int cypress_tiocmset(struct tty_struct *tty, struct file *file,
925 unsigned int set, unsigned int clear)
926 {
927 struct usb_serial_port *port = tty->driver_data;
928 struct cypress_private *priv = usb_get_serial_port_data(port);
929 unsigned long flags;
930
931 dbg("%s - port %d", __func__, port->number);
932
933 spin_lock_irqsave(&priv->lock, flags);
934 if (set & TIOCM_RTS)
935 priv->line_control |= CONTROL_RTS;
936 if (set & TIOCM_DTR)
937 priv->line_control |= CONTROL_DTR;
938 if (clear & TIOCM_RTS)
939 priv->line_control &= ~CONTROL_RTS;
940 if (clear & TIOCM_DTR)
941 priv->line_control &= ~CONTROL_DTR;
942 priv->cmd_ctrl = 1;
943 spin_unlock_irqrestore(&priv->lock, flags);
944
945 return cypress_write(tty, port, NULL, 0);
946 }
947
948
949 static int cypress_ioctl(struct tty_struct *tty, struct file *file,
950 unsigned int cmd, unsigned long arg)
951 {
952 struct usb_serial_port *port = tty->driver_data;
953 struct cypress_private *priv = usb_get_serial_port_data(port);
954
955 dbg("%s - port %d, cmd 0x%.4x", __func__, port->number, cmd);
956
957 switch (cmd) {
958 /* This code comes from drivers/char/serial.c and ftdi_sio.c */
959 case TIOCMIWAIT:
960 while (priv != NULL) {
961 interruptible_sleep_on(&priv->delta_msr_wait);
962 /* see if a signal did it */
963 if (signal_pending(current))
964 return -ERESTARTSYS;
965 else {
966 char diff = priv->diff_status;
967 if (diff == 0)
968 return -EIO; /* no change => error */
969
970 /* consume all events */
971 priv->diff_status = 0;
972
973 /* return 0 if caller wanted to know about
974 these bits */
975 if (((arg & TIOCM_RNG) && (diff & UART_RI)) ||
976 ((arg & TIOCM_DSR) && (diff & UART_DSR)) ||
977 ((arg & TIOCM_CD) && (diff & UART_CD)) ||
978 ((arg & TIOCM_CTS) && (diff & UART_CTS)))
979 return 0;
980 /* otherwise caller can't care less about what
981 * happened, and so we continue to wait for
982 * more events.
983 */
984 }
985 }
986 return 0;
987 default:
988 break;
989 }
990 dbg("%s - arg not supported - it was 0x%04x - check include/asm/ioctls.h", __func__, cmd);
991 return -ENOIOCTLCMD;
992 } /* cypress_ioctl */
993
994
995 static void cypress_set_termios(struct tty_struct *tty,
996 struct usb_serial_port *port, struct ktermios *old_termios)
997 {
998 struct cypress_private *priv = usb_get_serial_port_data(port);
999 int data_bits, stop_bits, parity_type, parity_enable;
1000 unsigned cflag, iflag;
1001 unsigned long flags;
1002 __u8 oldlines;
1003 int linechange = 0;
1004
1005 dbg("%s - port %d", __func__, port->number);
1006
1007 spin_lock_irqsave(&priv->lock, flags);
1008 if (!priv->termios_initialized) {
1009 if (priv->chiptype == CT_EARTHMATE) {
1010 *(tty->termios) = tty_std_termios;
1011 tty->termios->c_cflag = B4800 | CS8 | CREAD | HUPCL |
1012 CLOCAL;
1013 tty->termios->c_ispeed = 4800;
1014 tty->termios->c_ospeed = 4800;
1015 } else if (priv->chiptype == CT_CYPHIDCOM) {
1016 *(tty->termios) = tty_std_termios;
1017 tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL |
1018 CLOCAL;
1019 tty->termios->c_ispeed = 9600;
1020 tty->termios->c_ospeed = 9600;
1021 } else if (priv->chiptype == CT_CA42V2) {
1022 *(tty->termios) = tty_std_termios;
1023 tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL |
1024 CLOCAL;
1025 tty->termios->c_ispeed = 9600;
1026 tty->termios->c_ospeed = 9600;
1027 }
1028 priv->termios_initialized = 1;
1029 }
1030 spin_unlock_irqrestore(&priv->lock, flags);
1031
1032 /* Unsupported features need clearing */
1033 tty->termios->c_cflag &= ~(CMSPAR|CRTSCTS);
1034
1035 cflag = tty->termios->c_cflag;
1036 iflag = tty->termios->c_iflag;
1037
1038 /* check if there are new settings */
1039 if (old_termios) {
1040 spin_lock_irqsave(&priv->lock, flags);
1041 priv->tmp_termios = *(tty->termios);
1042 spin_unlock_irqrestore(&priv->lock, flags);
1043 }
1044
1045 /* set number of data bits, parity, stop bits */
1046 /* when parity is disabled the parity type bit is ignored */
1047
1048 /* 1 means 2 stop bits, 0 means 1 stop bit */
1049 stop_bits = cflag & CSTOPB ? 1 : 0;
1050
1051 if (cflag & PARENB) {
1052 parity_enable = 1;
1053 /* 1 means odd parity, 0 means even parity */
1054 parity_type = cflag & PARODD ? 1 : 0;
1055 } else
1056 parity_enable = parity_type = 0;
1057
1058 switch (cflag & CSIZE) {
1059 case CS5:
1060 data_bits = 0;
1061 break;
1062 case CS6:
1063 data_bits = 1;
1064 break;
1065 case CS7:
1066 data_bits = 2;
1067 break;
1068 case CS8:
1069 data_bits = 3;
1070 break;
1071 default:
1072 dev_err(&port->dev, "%s - CSIZE was set, but not CS5-CS8\n",
1073 __func__);
1074 data_bits = 3;
1075 }
1076 spin_lock_irqsave(&priv->lock, flags);
1077 oldlines = priv->line_control;
1078 if ((cflag & CBAUD) == B0) {
1079 /* drop dtr and rts */
1080 dbg("%s - dropping the lines, baud rate 0bps", __func__);
1081 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
1082 } else
1083 priv->line_control = (CONTROL_DTR | CONTROL_RTS);
1084 spin_unlock_irqrestore(&priv->lock, flags);
1085
1086 dbg("%s - sending %d stop_bits, %d parity_enable, %d parity_type, "
1087 "%d data_bits (+5)", __func__, stop_bits,
1088 parity_enable, parity_type, data_bits);
1089
1090 cypress_serial_control(tty, port, tty_get_baud_rate(tty),
1091 data_bits, stop_bits,
1092 parity_enable, parity_type,
1093 0, CYPRESS_SET_CONFIG);
1094
1095 /* we perform a CYPRESS_GET_CONFIG so that the current settings are
1096 * filled into the private structure this should confirm that all is
1097 * working if it returns what we just set */
1098 cypress_serial_control(tty, port, 0, 0, 0, 0, 0, 0, CYPRESS_GET_CONFIG);
1099
1100 /* Here we can define custom tty settings for devices; the main tty
1101 * termios flag base comes from empeg.c */
1102
1103 spin_lock_irqsave(&priv->lock, flags);
1104 if (priv->chiptype == CT_EARTHMATE && priv->baud_rate == 4800) {
1105 dbg("Using custom termios settings for a baud rate of "
1106 "4800bps.");
1107 /* define custom termios settings for NMEA protocol */
1108
1109 tty->termios->c_iflag /* input modes - */
1110 &= ~(IGNBRK /* disable ignore break */
1111 | BRKINT /* disable break causes interrupt */
1112 | PARMRK /* disable mark parity errors */
1113 | ISTRIP /* disable clear high bit of input char */
1114 | INLCR /* disable translate NL to CR */
1115 | IGNCR /* disable ignore CR */
1116 | ICRNL /* disable translate CR to NL */
1117 | IXON); /* disable enable XON/XOFF flow control */
1118
1119 tty->termios->c_oflag /* output modes */
1120 &= ~OPOST; /* disable postprocess output char */
1121
1122 tty->termios->c_lflag /* line discipline modes */
1123 &= ~(ECHO /* disable echo input characters */
1124 | ECHONL /* disable echo new line */
1125 | ICANON /* disable erase, kill, werase, and rprnt
1126 special characters */
1127 | ISIG /* disable interrupt, quit, and suspend
1128 special characters */
1129 | IEXTEN); /* disable non-POSIX special characters */
1130 } /* CT_CYPHIDCOM: Application should handle this for device */
1131
1132 linechange = (priv->line_control != oldlines);
1133 spin_unlock_irqrestore(&priv->lock, flags);
1134
1135 /* if necessary, set lines */
1136 if (linechange) {
1137 priv->cmd_ctrl = 1;
1138 cypress_write(tty, port, NULL, 0);
1139 }
1140 } /* cypress_set_termios */
1141
1142
1143 /* returns amount of data still left in soft buffer */
1144 static int cypress_chars_in_buffer(struct tty_struct *tty)
1145 {
1146 struct usb_serial_port *port = tty->driver_data;
1147 struct cypress_private *priv = usb_get_serial_port_data(port);
1148 int chars = 0;
1149 unsigned long flags;
1150
1151 dbg("%s - port %d", __func__, port->number);
1152
1153 spin_lock_irqsave(&priv->lock, flags);
1154 chars = cypress_buf_data_avail(priv->buf);
1155 spin_unlock_irqrestore(&priv->lock, flags);
1156
1157 dbg("%s - returns %d", __func__, chars);
1158 return chars;
1159 }
1160
1161
1162 static void cypress_throttle(struct tty_struct *tty)
1163 {
1164 struct usb_serial_port *port = tty->driver_data;
1165 struct cypress_private *priv = usb_get_serial_port_data(port);
1166 unsigned long flags;
1167
1168 dbg("%s - port %d", __func__, port->number);
1169
1170 spin_lock_irqsave(&priv->lock, flags);
1171 priv->rx_flags = THROTTLED;
1172 spin_unlock_irqrestore(&priv->lock, flags);
1173 }
1174
1175
1176 static void cypress_unthrottle(struct tty_struct *tty)
1177 {
1178 struct usb_serial_port *port = tty->driver_data;
1179 struct cypress_private *priv = usb_get_serial_port_data(port);
1180 int actually_throttled, result;
1181 unsigned long flags;
1182
1183 dbg("%s - port %d", __func__, port->number);
1184
1185 spin_lock_irqsave(&priv->lock, flags);
1186 actually_throttled = priv->rx_flags & ACTUALLY_THROTTLED;
1187 priv->rx_flags = 0;
1188 spin_unlock_irqrestore(&priv->lock, flags);
1189
1190 if (!priv->comm_is_ok)
1191 return;
1192
1193 if (actually_throttled) {
1194 port->interrupt_in_urb->dev = port->serial->dev;
1195
1196 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
1197 if (result) {
1198 dev_err(&port->dev, "%s - failed submitting read urb, "
1199 "error %d\n", __func__, result);
1200 cypress_set_dead(port);
1201 }
1202 }
1203 }
1204
1205
1206 static void cypress_read_int_callback(struct urb *urb)
1207 {
1208 struct usb_serial_port *port = urb->context;
1209 struct cypress_private *priv = usb_get_serial_port_data(port);
1210 struct tty_struct *tty;
1211 unsigned char *data = urb->transfer_buffer;
1212 unsigned long flags;
1213 char tty_flag = TTY_NORMAL;
1214 int havedata = 0;
1215 int bytes = 0;
1216 int result;
1217 int i = 0;
1218 int status = urb->status;
1219
1220 dbg("%s - port %d", __func__, port->number);
1221
1222 switch (status) {
1223 case 0: /* success */
1224 break;
1225 case -ECONNRESET:
1226 case -ENOENT:
1227 case -ESHUTDOWN:
1228 /* precursor to disconnect so just go away */
1229 return;
1230 case -EPIPE:
1231 usb_clear_halt(port->serial->dev, 0x81);
1232 break;
1233 default:
1234 /* something ugly is going on... */
1235 dev_err(&urb->dev->dev,
1236 "%s - unexpected nonzero read status received: %d\n",
1237 __func__, status);
1238 cypress_set_dead(port);
1239 return;
1240 }
1241
1242 spin_lock_irqsave(&priv->lock, flags);
1243 if (priv->rx_flags & THROTTLED) {
1244 dbg("%s - now throttling", __func__);
1245 priv->rx_flags |= ACTUALLY_THROTTLED;
1246 spin_unlock_irqrestore(&priv->lock, flags);
1247 return;
1248 }
1249 spin_unlock_irqrestore(&priv->lock, flags);
1250
1251 tty = tty_port_tty_get(&port->port);
1252 if (!tty) {
1253 dbg("%s - bad tty pointer - exiting", __func__);
1254 return;
1255 }
1256
1257 spin_lock_irqsave(&priv->lock, flags);
1258 result = urb->actual_length;
1259 switch (priv->pkt_fmt) {
1260 default:
1261 case packet_format_1:
1262 /* This is for the CY7C64013... */
1263 priv->current_status = data[0] & 0xF8;
1264 bytes = data[1] + 2;
1265 i = 2;
1266 if (bytes > 2)
1267 havedata = 1;
1268 break;
1269 case packet_format_2:
1270 /* This is for the CY7C63743... */
1271 priv->current_status = data[0] & 0xF8;
1272 bytes = (data[0] & 0x07) + 1;
1273 i = 1;
1274 if (bytes > 1)
1275 havedata = 1;
1276 break;
1277 }
1278 spin_unlock_irqrestore(&priv->lock, flags);
1279 if (result < bytes) {
1280 dbg("%s - wrong packet size - received %d bytes but packet "
1281 "said %d bytes", __func__, result, bytes);
1282 goto continue_read;
1283 }
1284
1285 usb_serial_debug_data(debug, &port->dev, __func__,
1286 urb->actual_length, data);
1287
1288 spin_lock_irqsave(&priv->lock, flags);
1289 /* check to see if status has changed */
1290 if (priv->current_status != priv->prev_status) {
1291 priv->diff_status |= priv->current_status ^
1292 priv->prev_status;
1293 wake_up_interruptible(&priv->delta_msr_wait);
1294 priv->prev_status = priv->current_status;
1295 }
1296 spin_unlock_irqrestore(&priv->lock, flags);
1297
1298 /* hangup, as defined in acm.c... this might be a bad place for it
1299 * though */
1300 if (tty && !(tty->termios->c_cflag & CLOCAL) &&
1301 !(priv->current_status & UART_CD)) {
1302 dbg("%s - calling hangup", __func__);
1303 tty_hangup(tty);
1304 goto continue_read;
1305 }
1306
1307 /* There is one error bit... I'm assuming it is a parity error
1308 * indicator as the generic firmware will set this bit to 1 if a
1309 * parity error occurs.
1310 * I can not find reference to any other error events. */
1311 spin_lock_irqsave(&priv->lock, flags);
1312 if (priv->current_status & CYP_ERROR) {
1313 spin_unlock_irqrestore(&priv->lock, flags);
1314 tty_flag = TTY_PARITY;
1315 dbg("%s - Parity Error detected", __func__);
1316 } else
1317 spin_unlock_irqrestore(&priv->lock, flags);
1318
1319 /* process read if there is data other than line status */
1320 if (tty && (bytes > i)) {
1321 bytes = tty_buffer_request_room(tty, bytes);
1322 for (; i < bytes ; ++i) {
1323 dbg("pushing byte number %d - %d - %c", i, data[i],
1324 data[i]);
1325 tty_insert_flip_char(tty, data[i], tty_flag);
1326 }
1327 tty_flip_buffer_push(tty);
1328 }
1329
1330 spin_lock_irqsave(&priv->lock, flags);
1331 /* control and status byte(s) are also counted */
1332 priv->bytes_in += bytes;
1333 spin_unlock_irqrestore(&priv->lock, flags);
1334
1335 continue_read:
1336 tty_kref_put(tty);
1337
1338 /* Continue trying to always read... unless the port has closed. */
1339
1340 if (port->port.count > 0 && priv->comm_is_ok) {
1341 usb_fill_int_urb(port->interrupt_in_urb, port->serial->dev,
1342 usb_rcvintpipe(port->serial->dev,
1343 port->interrupt_in_endpointAddress),
1344 port->interrupt_in_urb->transfer_buffer,
1345 port->interrupt_in_urb->transfer_buffer_length,
1346 cypress_read_int_callback, port,
1347 priv->read_urb_interval);
1348 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
1349 if (result) {
1350 dev_err(&urb->dev->dev, "%s - failed resubmitting "
1351 "read urb, error %d\n", __func__,
1352 result);
1353 cypress_set_dead(port);
1354 }
1355 }
1356
1357 return;
1358 } /* cypress_read_int_callback */
1359
1360
1361 static void cypress_write_int_callback(struct urb *urb)
1362 {
1363 struct usb_serial_port *port = urb->context;
1364 struct cypress_private *priv = usb_get_serial_port_data(port);
1365 int result;
1366 int status = urb->status;
1367
1368 dbg("%s - port %d", __func__, port->number);
1369
1370 switch (status) {
1371 case 0:
1372 /* success */
1373 break;
1374 case -ECONNRESET:
1375 case -ENOENT:
1376 case -ESHUTDOWN:
1377 /* this urb is terminated, clean up */
1378 dbg("%s - urb shutting down with status: %d",
1379 __func__, status);
1380 priv->write_urb_in_use = 0;
1381 return;
1382 case -EPIPE: /* no break needed; clear halt and resubmit */
1383 if (!priv->comm_is_ok)
1384 break;
1385 usb_clear_halt(port->serial->dev, 0x02);
1386 /* error in the urb, so we have to resubmit it */
1387 dbg("%s - nonzero write bulk status received: %d",
1388 __func__, status);
1389 port->interrupt_out_urb->transfer_buffer_length = 1;
1390 port->interrupt_out_urb->dev = port->serial->dev;
1391 result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC);
1392 if (!result)
1393 return;
1394 dev_err(&urb->dev->dev,
1395 "%s - failed resubmitting write urb, error %d\n",
1396 __func__, result);
1397 cypress_set_dead(port);
1398 break;
1399 default:
1400 dev_err(&urb->dev->dev,
1401 "%s - unexpected nonzero write status received: %d\n",
1402 __func__, status);
1403 cypress_set_dead(port);
1404 break;
1405 }
1406 priv->write_urb_in_use = 0;
1407
1408 /* send any buffered data */
1409 cypress_send(port);
1410 }
1411
1412
1413 /*****************************************************************************
1414 * Write buffer functions - buffering code from pl2303 used
1415 *****************************************************************************/
1416
1417 /*
1418 * cypress_buf_alloc
1419 *
1420 * Allocate a circular buffer and all associated memory.
1421 */
1422
1423 static struct cypress_buf *cypress_buf_alloc(unsigned int size)
1424 {
1425
1426 struct cypress_buf *cb;
1427
1428
1429 if (size == 0)
1430 return NULL;
1431
1432 cb = kmalloc(sizeof(struct cypress_buf), GFP_KERNEL);
1433 if (cb == NULL)
1434 return NULL;
1435
1436 cb->buf_buf = kmalloc(size, GFP_KERNEL);
1437 if (cb->buf_buf == NULL) {
1438 kfree(cb);
1439 return NULL;
1440 }
1441
1442 cb->buf_size = size;
1443 cb->buf_get = cb->buf_put = cb->buf_buf;
1444
1445 return cb;
1446
1447 }
1448
1449
1450 /*
1451 * cypress_buf_free
1452 *
1453 * Free the buffer and all associated memory.
1454 */
1455
1456 static void cypress_buf_free(struct cypress_buf *cb)
1457 {
1458 if (cb) {
1459 kfree(cb->buf_buf);
1460 kfree(cb);
1461 }
1462 }
1463
1464
1465 /*
1466 * cypress_buf_clear
1467 *
1468 * Clear out all data in the circular buffer.
1469 */
1470
1471 static void cypress_buf_clear(struct cypress_buf *cb)
1472 {
1473 if (cb != NULL)
1474 cb->buf_get = cb->buf_put;
1475 /* equivalent to a get of all data available */
1476 }
1477
1478
1479 /*
1480 * cypress_buf_data_avail
1481 *
1482 * Return the number of bytes of data available in the circular
1483 * buffer.
1484 */
1485
1486 static unsigned int cypress_buf_data_avail(struct cypress_buf *cb)
1487 {
1488 if (cb != NULL)
1489 return (cb->buf_size + cb->buf_put - cb->buf_get)
1490 % cb->buf_size;
1491 else
1492 return 0;
1493 }
1494
1495
1496 /*
1497 * cypress_buf_space_avail
1498 *
1499 * Return the number of bytes of space available in the circular
1500 * buffer.
1501 */
1502
1503 static unsigned int cypress_buf_space_avail(struct cypress_buf *cb)
1504 {
1505 if (cb != NULL)
1506 return (cb->buf_size + cb->buf_get - cb->buf_put - 1)
1507 % cb->buf_size;
1508 else
1509 return 0;
1510 }
1511
1512
1513 /*
1514 * cypress_buf_put
1515 *
1516 * Copy data data from a user buffer and put it into the circular buffer.
1517 * Restrict to the amount of space available.
1518 *
1519 * Return the number of bytes copied.
1520 */
1521
1522 static unsigned int cypress_buf_put(struct cypress_buf *cb, const char *buf,
1523 unsigned int count)
1524 {
1525
1526 unsigned int len;
1527
1528
1529 if (cb == NULL)
1530 return 0;
1531
1532 len = cypress_buf_space_avail(cb);
1533 if (count > len)
1534 count = len;
1535
1536 if (count == 0)
1537 return 0;
1538
1539 len = cb->buf_buf + cb->buf_size - cb->buf_put;
1540 if (count > len) {
1541 memcpy(cb->buf_put, buf, len);
1542 memcpy(cb->buf_buf, buf+len, count - len);
1543 cb->buf_put = cb->buf_buf + count - len;
1544 } else {
1545 memcpy(cb->buf_put, buf, count);
1546 if (count < len)
1547 cb->buf_put += count;
1548 else /* count == len */
1549 cb->buf_put = cb->buf_buf;
1550 }
1551
1552 return count;
1553
1554 }
1555
1556
1557 /*
1558 * cypress_buf_get
1559 *
1560 * Get data from the circular buffer and copy to the given buffer.
1561 * Restrict to the amount of data available.
1562 *
1563 * Return the number of bytes copied.
1564 */
1565
1566 static unsigned int cypress_buf_get(struct cypress_buf *cb, char *buf,
1567 unsigned int count)
1568 {
1569
1570 unsigned int len;
1571
1572
1573 if (cb == NULL)
1574 return 0;
1575
1576 len = cypress_buf_data_avail(cb);
1577 if (count > len)
1578 count = len;
1579
1580 if (count == 0)
1581 return 0;
1582
1583 len = cb->buf_buf + cb->buf_size - cb->buf_get;
1584 if (count > len) {
1585 memcpy(buf, cb->buf_get, len);
1586 memcpy(buf+len, cb->buf_buf, count - len);
1587 cb->buf_get = cb->buf_buf + count - len;
1588 } else {
1589 memcpy(buf, cb->buf_get, count);
1590 if (count < len)
1591 cb->buf_get += count;
1592 else /* count == len */
1593 cb->buf_get = cb->buf_buf;
1594 }
1595
1596 return count;
1597
1598 }
1599
1600 /*****************************************************************************
1601 * Module functions
1602 *****************************************************************************/
1603
1604 static int __init cypress_init(void)
1605 {
1606 int retval;
1607
1608 dbg("%s", __func__);
1609
1610 retval = usb_serial_register(&cypress_earthmate_device);
1611 if (retval)
1612 goto failed_em_register;
1613 retval = usb_serial_register(&cypress_hidcom_device);
1614 if (retval)
1615 goto failed_hidcom_register;
1616 retval = usb_serial_register(&cypress_ca42v2_device);
1617 if (retval)
1618 goto failed_ca42v2_register;
1619 retval = usb_register(&cypress_driver);
1620 if (retval)
1621 goto failed_usb_register;
1622
1623 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
1624 DRIVER_DESC "\n");
1625 return 0;
1626
1627 failed_usb_register:
1628 usb_serial_deregister(&cypress_ca42v2_device);
1629 failed_ca42v2_register:
1630 usb_serial_deregister(&cypress_hidcom_device);
1631 failed_hidcom_register:
1632 usb_serial_deregister(&cypress_earthmate_device);
1633 failed_em_register:
1634 return retval;
1635 }
1636
1637
1638 static void __exit cypress_exit(void)
1639 {
1640 dbg("%s", __func__);
1641
1642 usb_deregister(&cypress_driver);
1643 usb_serial_deregister(&cypress_earthmate_device);
1644 usb_serial_deregister(&cypress_hidcom_device);
1645 usb_serial_deregister(&cypress_ca42v2_device);
1646 }
1647
1648
1649 module_init(cypress_init);
1650 module_exit(cypress_exit);
1651
1652 MODULE_AUTHOR(DRIVER_AUTHOR);
1653 MODULE_DESCRIPTION(DRIVER_DESC);
1654 MODULE_VERSION(DRIVER_VERSION);
1655 MODULE_LICENSE("GPL");
1656
1657 module_param(debug, bool, S_IRUGO | S_IWUSR);
1658 MODULE_PARM_DESC(debug, "Debug enabled or not");
1659 module_param(stats, bool, S_IRUGO | S_IWUSR);
1660 MODULE_PARM_DESC(stats, "Enable statistics or not");
1661 module_param(interval, int, S_IRUGO | S_IWUSR);
1662 MODULE_PARM_DESC(interval, "Overrides interrupt interval");
Linux kernel - Deliverables
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