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ia64/kvm: compilation fix. export account_system_vtime.
[pv_ops_mirror.git] / drivers / usb / serial / cypress_m8.c
blob0230d3c0888af92e816d2d432f60a7171c4f547d
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 driver
15 *
16 * See http://geocities.com/i0xox0i for information on this driver and the
17 * earthmate usb device.
18 *
19 * Lonnie Mendez <dignome@gmail.com>
20 * 4-29-2005
21 * Fixed problem where setting or retreiving the serial config would fail with
22 * EPIPE. Removed CRTS toggling so the driver behaves more like other usbserial
23 * adapters. Issued new interval of 1ms instead of the default 10ms. As a
24 * result, transfer speed has been substantially increased. From avg. 850bps to
25 * avg. 3300bps. initial termios has also been modified. Cleaned up code and
26 * formatting issues so it is more readable. Replaced the C++ style comments.
27 *
28 * Lonnie Mendez <dignome@gmail.com>
29 * 12-15-2004
30 * Incorporated write buffering from pl2303 driver. Fixed bug with line
31 * handling so both lines are raised in cypress_open. (was dropping rts)
32 * Various code cleanups made as well along with other misc bug fixes.
33 *
34 * Lonnie Mendez <dignome@gmail.com>
35 * 04-10-2004
36 * Driver modified to support dynamic line settings. Various improvments
37 * and features.
38 *
39 * Neil Whelchel
40 * 10-2003
41 * Driver first released.
42 *
43 */
44
45 /* Thanks to Neil Whelchel for writing the first cypress m8 implementation for linux. */
46 /* Thanks to cypress for providing references for the hid reports. */
47 /* Thanks to Jiang Zhang for providing links and for general help. */
48 /* Code originates and was built up from ftdi_sio, belkin, pl2303 and others. */
49
50
51 #include <linux/kernel.h>
52 #include <linux/errno.h>
53 #include <linux/init.h>
54 #include <linux/slab.h>
55 #include <linux/tty.h>
56 #include <linux/tty_driver.h>
57 #include <linux/tty_flip.h>
58 #include <linux/module.h>
59 #include <linux/moduleparam.h>
60 #include <linux/spinlock.h>
61 #include <linux/usb.h>
62 #include <linux/usb/serial.h>
63 #include <linux/serial.h>
64 #include <linux/delay.h>
65 #include <asm/uaccess.h>
66
67 #include "cypress_m8.h"
68
69
70 #ifdef CONFIG_USB_SERIAL_DEBUG
71 static int debug = 1;
72 #else
73 static int debug;
74 #endif
75 static int stats;
76 static int interval;
77
78 /*
79 * Version Information
80 */
81 #define DRIVER_VERSION "v1.09"
82 #define DRIVER_AUTHOR "Lonnie Mendez <dignome@gmail.com>, Neil Whelchel <koyama@firstlight.net>"
83 #define DRIVER_DESC "Cypress USB to Serial Driver"
84
85 /* write buffer size defines */
86 #define CYPRESS_BUF_SIZE 1024
87 #define CYPRESS_CLOSING_WAIT (30*HZ)
88
89 static struct usb_device_id id_table_earthmate [] = {
90 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
91 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
92 { } /* Terminating entry */
93 };
94
95 static struct usb_device_id id_table_cyphidcomrs232 [] = {
96 { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
97 { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) },
98 { } /* Terminating entry */
99 };
100
101 static struct usb_device_id id_table_nokiaca42v2 [] = {
102 { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
103 { } /* Terminating entry */
104 };
105
106 static struct usb_device_id id_table_combined [] = {
107 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
108 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
109 { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
110 { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) },
111 { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
112 { } /* Terminating entry */
113 };
114
115 MODULE_DEVICE_TABLE (usb, id_table_combined);
116
117 static struct usb_driver cypress_driver = {
118 .name = "cypress",
119 .probe = usb_serial_probe,
120 .disconnect = usb_serial_disconnect,
121 .id_table = id_table_combined,
122 .no_dynamic_id = 1,
123 };
124
125 enum packet_format {
126 packet_format_1, /* b0:status, b1:payload count */
127 packet_format_2 /* b0[7:3]:status, b0[2:0]:payload count */
128 };
129
130 struct cypress_private {
131 spinlock_t lock; /* private lock */
132 int chiptype; /* identifier of device, for quirks/etc */
133 int bytes_in; /* used for statistics */
134 int bytes_out; /* used for statistics */
135 int cmd_count; /* used for statistics */
136 int cmd_ctrl; /* always set this to 1 before issuing a command */
137 struct cypress_buf *buf; /* write buffer */
138 int write_urb_in_use; /* write urb in use indicator */
139 int write_urb_interval; /* interval to use for write urb */
140 int read_urb_interval; /* interval to use for read urb */
141 int comm_is_ok; /* true if communication is (still) ok */
142 int termios_initialized;
143 __u8 line_control; /* holds dtr / rts value */
144 __u8 current_status; /* received from last read - info on dsr,cts,cd,ri,etc */
145 __u8 current_config; /* stores the current configuration byte */
146 __u8 rx_flags; /* throttling - used from whiteheat/ftdi_sio */
147 enum packet_format pkt_fmt; /* format to use for packet send / receive */
148 int get_cfg_unsafe; /* If true, the CYPRESS_GET_CONFIG is unsafe */
149 int baud_rate; /* stores current baud rate in integer form */
150 int isthrottled; /* if throttled, discard reads */
151 wait_queue_head_t delta_msr_wait; /* used for TIOCMIWAIT */
152 char prev_status, diff_status; /* used for TIOCMIWAIT */
153 /* we pass a pointer to this as the arguement sent to cypress_set_termios old_termios */
154 struct ktermios tmp_termios; /* stores the old termios settings */
155 };
156
157 /* write buffer structure */
158 struct cypress_buf {
159 unsigned int buf_size;
160 char *buf_buf;
161 char *buf_get;
162 char *buf_put;
163 };
164
165 /* function prototypes for the Cypress USB to serial device */
166 static int cypress_earthmate_startup (struct usb_serial *serial);
167 static int cypress_hidcom_startup (struct usb_serial *serial);
168 static int cypress_ca42v2_startup (struct usb_serial *serial);
169 static void cypress_shutdown (struct usb_serial *serial);
170 static int cypress_open (struct usb_serial_port *port, struct file *filp);
171 static void cypress_close (struct usb_serial_port *port, struct file *filp);
172 static int cypress_write (struct usb_serial_port *port, const unsigned char *buf, int count);
173 static void cypress_send (struct usb_serial_port *port);
174 static int cypress_write_room (struct usb_serial_port *port);
175 static int cypress_ioctl (struct usb_serial_port *port, struct file * file, unsigned int cmd, unsigned long arg);
176 static void cypress_set_termios (struct usb_serial_port *port, struct ktermios * old);
177 static int cypress_tiocmget (struct usb_serial_port *port, struct file *file);
178 static int cypress_tiocmset (struct usb_serial_port *port, struct file *file, unsigned int set, unsigned int clear);
179 static int cypress_chars_in_buffer (struct usb_serial_port *port);
180 static void cypress_throttle (struct usb_serial_port *port);
181 static void cypress_unthrottle (struct usb_serial_port *port);
182 static void cypress_set_dead (struct usb_serial_port *port);
183 static void cypress_read_int_callback (struct urb *urb);
184 static void cypress_write_int_callback (struct urb *urb);
185 /* write buffer functions */
186 static struct cypress_buf *cypress_buf_alloc(unsigned int size);
187 static void cypress_buf_free(struct cypress_buf *cb);
188 static void cypress_buf_clear(struct cypress_buf *cb);
189 static unsigned int cypress_buf_data_avail(struct cypress_buf *cb);
190 static unsigned int cypress_buf_space_avail(struct cypress_buf *cb);
191 static unsigned int cypress_buf_put(struct cypress_buf *cb, const char *buf, unsigned int count);
192 static unsigned int cypress_buf_get(struct cypress_buf *cb, char *buf, unsigned int count);
193
194
195 static struct usb_serial_driver cypress_earthmate_device = {
196 .driver = {
197 .owner = THIS_MODULE,
198 .name = "earthmate",
199 },
200 .description = "DeLorme Earthmate USB",
201 .usb_driver = &cypress_driver,
202 .id_table = id_table_earthmate,
203 .num_ports = 1,
204 .attach = cypress_earthmate_startup,
205 .shutdown = cypress_shutdown,
206 .open = cypress_open,
207 .close = cypress_close,
208 .write = cypress_write,
209 .write_room = cypress_write_room,
210 .ioctl = cypress_ioctl,
211 .set_termios = cypress_set_termios,
212 .tiocmget = cypress_tiocmget,
213 .tiocmset = cypress_tiocmset,
214 .chars_in_buffer = cypress_chars_in_buffer,
215 .throttle = cypress_throttle,
216 .unthrottle = cypress_unthrottle,
217 .read_int_callback = cypress_read_int_callback,
218 .write_int_callback = cypress_write_int_callback,
219 };
220
221 static struct usb_serial_driver cypress_hidcom_device = {
222 .driver = {
223 .owner = THIS_MODULE,
224 .name = "cyphidcom",
225 },
226 .description = "HID->COM RS232 Adapter",
227 .usb_driver = &cypress_driver,
228 .id_table = id_table_cyphidcomrs232,
229 .num_ports = 1,
230 .attach = cypress_hidcom_startup,
231 .shutdown = cypress_shutdown,
232 .open = cypress_open,
233 .close = cypress_close,
234 .write = cypress_write,
235 .write_room = cypress_write_room,
236 .ioctl = cypress_ioctl,
237 .set_termios = cypress_set_termios,
238 .tiocmget = cypress_tiocmget,
239 .tiocmset = cypress_tiocmset,
240 .chars_in_buffer = cypress_chars_in_buffer,
241 .throttle = cypress_throttle,
242 .unthrottle = cypress_unthrottle,
243 .read_int_callback = cypress_read_int_callback,
244 .write_int_callback = cypress_write_int_callback,
245 };
246
247 static struct usb_serial_driver cypress_ca42v2_device = {
248 .driver = {
249 .owner = THIS_MODULE,
250 .name = "nokiaca42v2",
251 },
252 .description = "Nokia CA-42 V2 Adapter",
253 .usb_driver = &cypress_driver,
254 .id_table = id_table_nokiaca42v2,
255 .num_ports = 1,
256 .attach = cypress_ca42v2_startup,
257 .shutdown = cypress_shutdown,
258 .open = cypress_open,
259 .close = cypress_close,
260 .write = cypress_write,
261 .write_room = cypress_write_room,
262 .ioctl = cypress_ioctl,
263 .set_termios = cypress_set_termios,
264 .tiocmget = cypress_tiocmget,
265 .tiocmset = cypress_tiocmset,
266 .chars_in_buffer = cypress_chars_in_buffer,
267 .throttle = cypress_throttle,
268 .unthrottle = cypress_unthrottle,
269 .read_int_callback = cypress_read_int_callback,
270 .write_int_callback = cypress_write_int_callback,
271 };
272
273 /*****************************************************************************
274 * Cypress serial helper functions
275 *****************************************************************************/
276
277
278 static int analyze_baud_rate(struct usb_serial_port *port, speed_t new_rate)
279 {
280 struct cypress_private *priv;
281 priv = usb_get_serial_port_data(port);
282
283 /*
284 * The general purpose firmware for the Cypress M8 allows for
285 * a maximum speed of 57600bps (I have no idea whether DeLorme
286 * chose to use the general purpose firmware or not), if you
287 * need to modify this speed setting for your own project
288 * please add your own chiptype and modify the code likewise.
289 * The Cypress HID->COM device will work successfully up to
290 * 115200bps (but the actual throughput is around 3kBps).
291 */
292 if (port->serial->dev->speed == USB_SPEED_LOW) {
293 /*
294 * Mike Isely <isely@pobox.com> 2-Feb-2008: The
295 * Cypress app note that describes this mechanism
296 * states the the low-speed part can't handle more
297 * than 800 bytes/sec, in which case 4800 baud is the
298 * safest speed for a part like that.
299 */
300 if (new_rate > 4800) {
301 dbg("%s - failed setting baud rate, device incapable "
302 "speed %d", __func__, new_rate);
303 return -1;
304 }
305 }
306 switch (priv->chiptype) {
307 case CT_EARTHMATE:
308 if (new_rate <= 600) {
309 /* 300 and 600 baud rates are supported under
310 * the generic firmware, but are not used with
311 * NMEA and SiRF protocols */
312 dbg("%s - failed setting baud rate, unsupported speed "
313 "of %d on Earthmate GPS", __func__, new_rate);
314 return -1;
315 }
316 break;
317 default:
318 break;
319 }
320 return new_rate;
321 }
322
323
324 /* This function can either set or retrieve the current serial line settings */
325 static int cypress_serial_control (struct usb_serial_port *port, speed_t baud_rate, int data_bits, int stop_bits,
326 int parity_enable, int parity_type, int reset, int cypress_request_type)
327 {
328 int new_baudrate = 0, retval = 0, tries = 0;
329 struct cypress_private *priv;
330 __u8 feature_buffer[5];
331 unsigned long flags;
332
333 dbg("%s", __func__);
334
335 priv = usb_get_serial_port_data(port);
336
337 if (!priv->comm_is_ok)
338 return -ENODEV;
339
340 switch(cypress_request_type) {
341 case CYPRESS_SET_CONFIG:
342 new_baudrate = priv->baud_rate;
343 /* 0 means 'Hang up' so doesn't change the true bit rate */
344 if (baud_rate == 0)
345 new_baudrate = priv->baud_rate;
346 /* Change of speed ? */
347 else if (baud_rate != priv->baud_rate) {
348 dbg("%s - baud rate is changing", __func__);
349 retval = analyze_baud_rate(port, baud_rate);
350 if (retval >= 0) {
351 new_baudrate = retval;
352 dbg("%s - New baud rate set to %d",
353 __func__, new_baudrate);
354 }
355 }
356 dbg("%s - baud rate is being sent as %d", __func__, new_baudrate);
357
358 memset(feature_buffer, 0, sizeof(feature_buffer));
359 /* fill the feature_buffer with new configuration */
360 *((u_int32_t *)feature_buffer) = new_baudrate;
361
362 feature_buffer[4] |= data_bits; /* assign data bits in 2 bit space ( max 3 ) */
363 /* 1 bit gap */
364 feature_buffer[4] |= (stop_bits << 3); /* assign stop bits in 1 bit space */
365 feature_buffer[4] |= (parity_enable << 4); /* assign parity flag in 1 bit space */
366 feature_buffer[4] |= (parity_type << 5); /* assign parity type in 1 bit space */
367 /* 1 bit gap */
368 feature_buffer[4] |= (reset << 7); /* assign reset at end of byte, 1 bit space */
369
370 dbg("%s - device is being sent this feature report:", __func__);
371 dbg("%s - %02X - %02X - %02X - %02X - %02X", __func__, feature_buffer[0], feature_buffer[1],
372 feature_buffer[2], feature_buffer[3], feature_buffer[4]);
373
374 do {
375 retval = usb_control_msg(port->serial->dev,
376 usb_sndctrlpipe(port->serial->dev, 0),
377 HID_REQ_SET_REPORT,
378 USB_DIR_OUT | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
379 0x0300, 0, feature_buffer,
380 sizeof(feature_buffer), 500);
381
382 if (tries++ >= 3)
383 break;
384
385 } while (retval != sizeof(feature_buffer) &&
386 retval != -ENODEV);
387
388 if (retval != sizeof(feature_buffer)) {
389 err("%s - failed sending serial line settings - %d", __func__, retval);
390 cypress_set_dead(port);
391 } else {
392 spin_lock_irqsave(&priv->lock, flags);
393 priv->baud_rate = new_baudrate;
394 priv->current_config = feature_buffer[4];
395 spin_unlock_irqrestore(&priv->lock, flags);
396 /* If we asked for a speed change encode it */
397 if (baud_rate)
398 tty_encode_baud_rate(port->tty,
399 new_baudrate, new_baudrate);
400 }
401 break;
402 case CYPRESS_GET_CONFIG:
403 if (priv->get_cfg_unsafe) {
404 /* Not implemented for this device,
405 and if we try to do it we're likely
406 to crash the hardware. */
407 return -ENOTTY;
408 }
409 dbg("%s - retreiving serial line settings", __func__);
410 /* set initial values in feature buffer */
411 memset(feature_buffer, 0, sizeof(feature_buffer));
412
413 do {
414 retval = usb_control_msg(port->serial->dev,
415 usb_rcvctrlpipe(port->serial->dev, 0),
416 HID_REQ_GET_REPORT,
417 USB_DIR_IN | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
418 0x0300, 0, feature_buffer,
419 sizeof(feature_buffer), 500);
420
421 if (tries++ >= 3)
422 break;
423
424 } while (retval != sizeof(feature_buffer) &&
425 retval != -ENODEV);
426
427 if (retval != sizeof(feature_buffer)) {
428 err("%s - failed to retrieve serial line settings - %d", __func__, retval);
429 cypress_set_dead(port);
430 return retval;
431 } else {
432 spin_lock_irqsave(&priv->lock, flags);
433
434 /* store the config in one byte, and later use bit masks to check values */
435 priv->current_config = feature_buffer[4];
436 priv->baud_rate = *((u_int32_t *)feature_buffer);
437 spin_unlock_irqrestore(&priv->lock, flags);
438 }
439 }
440 spin_lock_irqsave(&priv->lock, flags);
441 ++priv->cmd_count;
442 spin_unlock_irqrestore(&priv->lock, flags);
443
444 return retval;
445 } /* cypress_serial_control */
446
447
448 static void cypress_set_dead(struct usb_serial_port *port)
449 {
450 struct cypress_private *priv = usb_get_serial_port_data(port);
451 unsigned long flags;
452
453 spin_lock_irqsave(&priv->lock, flags);
454 if (!priv->comm_is_ok) {
455 spin_unlock_irqrestore(&priv->lock, flags);
456 return;
457 }
458 priv->comm_is_ok = 0;
459 spin_unlock_irqrestore(&priv->lock, flags);
460
461 err("cypress_m8 suspending failing port %d - interval might be too short",
462 port->number);
463 }
464
465
466 /*****************************************************************************
467 * Cypress serial driver functions
468 *****************************************************************************/
469
470
471 static int generic_startup (struct usb_serial *serial)
472 {
473 struct cypress_private *priv;
474 struct usb_serial_port *port = serial->port[0];
475
476 dbg("%s - port %d", __func__, port->number);
477
478 priv = kzalloc(sizeof (struct cypress_private), GFP_KERNEL);
479 if (!priv)
480 return -ENOMEM;
481
482 priv->comm_is_ok = !0;
483 spin_lock_init(&priv->lock);
484 priv->buf = cypress_buf_alloc(CYPRESS_BUF_SIZE);
485 if (priv->buf == NULL) {
486 kfree(priv);
487 return -ENOMEM;
488 }
489 init_waitqueue_head(&priv->delta_msr_wait);
490
491 usb_reset_configuration (serial->dev);
492
493 priv->cmd_ctrl = 0;
494 priv->line_control = 0;
495 priv->termios_initialized = 0;
496 priv->rx_flags = 0;
497 /* Default packet format setting is determined by packet size.
498 Anything with a size larger then 9 must have a separate
499 count field since the 3 bit count field is otherwise too
500 small. Otherwise we can use the slightly more compact
501 format. This is in accordance with the cypress_m8 serial
502 converter app note. */
503 if (port->interrupt_out_size > 9) {
504 priv->pkt_fmt = packet_format_1;
505 } else {
506 priv->pkt_fmt = packet_format_2;
507 }
508 if (interval > 0) {
509 priv->write_urb_interval = interval;
510 priv->read_urb_interval = interval;
511 dbg("%s - port %d read & write intervals forced to %d",
512 __func__,port->number,interval);
513 } else {
514 priv->write_urb_interval = port->interrupt_out_urb->interval;
515 priv->read_urb_interval = port->interrupt_in_urb->interval;
516 dbg("%s - port %d intervals: read=%d write=%d",
517 __func__,port->number,
518 priv->read_urb_interval,priv->write_urb_interval);
519 }
520 usb_set_serial_port_data(port, priv);
521
522 return 0;
523 }
524
525
526 static int cypress_earthmate_startup (struct usb_serial *serial)
527 {
528 struct cypress_private *priv;
529 struct usb_serial_port *port = serial->port[0];
530
531 dbg("%s", __func__);
532
533 if (generic_startup(serial)) {
534 dbg("%s - Failed setting up port %d", __func__,
535 port->number);
536 return 1;
537 }
538
539 priv = usb_get_serial_port_data(port);
540 priv->chiptype = CT_EARTHMATE;
541 /* All Earthmate devices use the separated-count packet
542 format! Idiotic. */
543 priv->pkt_fmt = packet_format_1;
544 if (serial->dev->descriptor.idProduct != cpu_to_le16(PRODUCT_ID_EARTHMATEUSB)) {
545 /* The old original USB Earthmate seemed able to
546 handle GET_CONFIG requests; everything they've
547 produced since that time crashes if this command is
548 attempted :-( */
549 dbg("%s - Marking this device as unsafe for GET_CONFIG "
550 "commands", __func__);
551 priv->get_cfg_unsafe = !0;
552 }
553
554 return 0;
555 } /* cypress_earthmate_startup */
556
557
558 static int cypress_hidcom_startup (struct usb_serial *serial)
559 {
560 struct cypress_private *priv;
561
562 dbg("%s", __func__);
563
564 if (generic_startup(serial)) {
565 dbg("%s - Failed setting up port %d", __func__,
566 serial->port[0]->number);
567 return 1;
568 }
569
570 priv = usb_get_serial_port_data(serial->port[0]);
571 priv->chiptype = CT_CYPHIDCOM;
572
573 return 0;
574 } /* cypress_hidcom_startup */
575
576
577 static int cypress_ca42v2_startup (struct usb_serial *serial)
578 {
579 struct cypress_private *priv;
580
581 dbg("%s", __func__);
582
583 if (generic_startup(serial)) {
584 dbg("%s - Failed setting up port %d", __func__,
585 serial->port[0]->number);
586 return 1;
587 }
588
589 priv = usb_get_serial_port_data(serial->port[0]);
590 priv->chiptype = CT_CA42V2;
591
592 return 0;
593 } /* cypress_ca42v2_startup */
594
595
596 static void cypress_shutdown (struct usb_serial *serial)
597 {
598 struct cypress_private *priv;
599
600 dbg ("%s - port %d", __func__, serial->port[0]->number);
601
602 /* all open ports are closed at this point */
603
604 priv = usb_get_serial_port_data(serial->port[0]);
605
606 if (priv) {
607 cypress_buf_free(priv->buf);
608 kfree(priv);
609 usb_set_serial_port_data(serial->port[0], NULL);
610 }
611 }
612
613
614 static int cypress_open (struct usb_serial_port *port, struct file *filp)
615 {
616 struct cypress_private *priv = usb_get_serial_port_data(port);
617 struct usb_serial *serial = port->serial;
618 unsigned long flags;
619 int result = 0;
620
621 dbg("%s - port %d", __func__, port->number);
622
623 if (!priv->comm_is_ok)
624 return -EIO;
625
626 /* clear halts before open */
627 usb_clear_halt(serial->dev, 0x81);
628 usb_clear_halt(serial->dev, 0x02);
629
630 spin_lock_irqsave(&priv->lock, flags);
631 /* reset read/write statistics */
632 priv->bytes_in = 0;
633 priv->bytes_out = 0;
634 priv->cmd_count = 0;
635 priv->rx_flags = 0;
636 spin_unlock_irqrestore(&priv->lock, flags);
637
638 /* setting to zero could cause data loss */
639 port->tty->low_latency = 1;
640
641 /* raise both lines and set termios */
642 spin_lock_irqsave(&priv->lock, flags);
643 priv->line_control = CONTROL_DTR | CONTROL_RTS;
644 priv->cmd_ctrl = 1;
645 spin_unlock_irqrestore(&priv->lock, flags);
646 result = cypress_write(port, NULL, 0);
647
648 if (result) {
649 dev_err(&port->dev, "%s - failed setting the control lines - error %d\n", __func__, result);
650 return result;
651 } else
652 dbg("%s - success setting the control lines", __func__);
653
654 cypress_set_termios(port, &priv->tmp_termios);
655
656 /* setup the port and start reading from the device */
657 if(!port->interrupt_in_urb){
658 err("%s - interrupt_in_urb is empty!", __func__);
659 return(-1);
660 }
661
662 usb_fill_int_urb(port->interrupt_in_urb, serial->dev,
663 usb_rcvintpipe(serial->dev, port->interrupt_in_endpointAddress),
664 port->interrupt_in_urb->transfer_buffer, port->interrupt_in_urb->transfer_buffer_length,
665 cypress_read_int_callback, port, priv->read_urb_interval);
666 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
667
668 if (result){
669 dev_err(&port->dev, "%s - failed submitting read urb, error %d\n", __func__, result);
670 cypress_set_dead(port);
671 }
672
673 return result;
674 } /* cypress_open */
675
676
677 static void cypress_close(struct usb_serial_port *port, struct file * filp)
678 {
679 struct cypress_private *priv = usb_get_serial_port_data(port);
680 unsigned int c_cflag;
681 int bps;
682 long timeout;
683 wait_queue_t wait;
684
685 dbg("%s - port %d", __func__, port->number);
686
687 /* wait for data to drain from buffer */
688 spin_lock_irq(&priv->lock);
689 timeout = CYPRESS_CLOSING_WAIT;
690 init_waitqueue_entry(&wait, current);
691 add_wait_queue(&port->tty->write_wait, &wait);
692 for (;;) {
693 set_current_state(TASK_INTERRUPTIBLE);
694 if (cypress_buf_data_avail(priv->buf) == 0
695 || timeout == 0 || signal_pending(current)
696 /* without mutex, allowed due to harmless failure mode */
697 || port->serial->disconnected)
698 break;
699 spin_unlock_irq(&priv->lock);
700 timeout = schedule_timeout(timeout);
701 spin_lock_irq(&priv->lock);
702 }
703 set_current_state(TASK_RUNNING);
704 remove_wait_queue(&port->tty->write_wait, &wait);
705 /* clear out any remaining data in the buffer */
706 cypress_buf_clear(priv->buf);
707 spin_unlock_irq(&priv->lock);
708
709 /* writing is potentially harmful, lock must be taken */
710 mutex_lock(&port->serial->disc_mutex);
711 if (port->serial->disconnected) {
712 mutex_unlock(&port->serial->disc_mutex);
713 return;
714 }
715 /* wait for characters to drain from device */
716 bps = tty_get_baud_rate(port->tty);
717 if (bps > 1200)
718 timeout = max((HZ*2560)/bps,HZ/10);
719 else
720 timeout = 2*HZ;
721 schedule_timeout_interruptible(timeout);
722
723 dbg("%s - stopping urbs", __func__);
724 usb_kill_urb (port->interrupt_in_urb);
725 usb_kill_urb (port->interrupt_out_urb);
726
727 if (port->tty) {
728 c_cflag = port->tty->termios->c_cflag;
729 if (c_cflag & HUPCL) {
730 /* drop dtr and rts */
731 priv = usb_get_serial_port_data(port);
732 spin_lock_irq(&priv->lock);
733 priv->line_control = 0;
734 priv->cmd_ctrl = 1;
735 spin_unlock_irq(&priv->lock);
736 cypress_write(port, NULL, 0);
737 }
738 }
739
740 if (stats)
741 dev_info (&port->dev, "Statistics: %d Bytes In | %d Bytes Out | %d Commands Issued\n",
742 priv->bytes_in, priv->bytes_out, priv->cmd_count);
743 mutex_unlock(&port->serial->disc_mutex);
744 } /* cypress_close */
745
746
747 static int cypress_write(struct usb_serial_port *port, const unsigned char *buf, int count)
748 {
749 struct cypress_private *priv = usb_get_serial_port_data(port);
750 unsigned long flags;
751
752 dbg("%s - port %d, %d bytes", __func__, port->number, count);
753
754 /* line control commands, which need to be executed immediately,
755 are not put into the buffer for obvious reasons.
756 */
757 if (priv->cmd_ctrl) {
758 count = 0;
759 goto finish;
760 }
761
762 if (!count)
763 return count;
764
765 spin_lock_irqsave(&priv->lock, flags);
766 count = cypress_buf_put(priv->buf, buf, count);
767 spin_unlock_irqrestore(&priv->lock, flags);
768
769 finish:
770 cypress_send(port);
771
772 return count;
773 } /* cypress_write */
774
775
776 static void cypress_send(struct usb_serial_port *port)
777 {
778 int count = 0, result, offset, actual_size;
779 struct cypress_private *priv = usb_get_serial_port_data(port);
780 unsigned long flags;
781
782 if (!priv->comm_is_ok)
783 return;
784
785 dbg("%s - port %d", __func__, port->number);
786 dbg("%s - interrupt out size is %d", __func__, port->interrupt_out_size);
787
788 spin_lock_irqsave(&priv->lock, flags);
789 if (priv->write_urb_in_use) {
790 dbg("%s - can't write, urb in use", __func__);
791 spin_unlock_irqrestore(&priv->lock, flags);
792 return;
793 }
794 spin_unlock_irqrestore(&priv->lock, flags);
795
796 /* clear buffer */
797 memset(port->interrupt_out_urb->transfer_buffer, 0, port->interrupt_out_size);
798
799 spin_lock_irqsave(&priv->lock, flags);
800 switch (priv->pkt_fmt) {
801 default:
802 case packet_format_1:
803 /* this is for the CY7C64013... */
804 offset = 2;
805 port->interrupt_out_buffer[0] = priv->line_control;
806 break;
807 case packet_format_2:
808 /* this is for the CY7C63743... */
809 offset = 1;
810 port->interrupt_out_buffer[0] = priv->line_control;
811 break;
812 }
813
814 if (priv->line_control & CONTROL_RESET)
815 priv->line_control &= ~CONTROL_RESET;
816
817 if (priv->cmd_ctrl) {
818 priv->cmd_count++;
819 dbg("%s - line control command being issued", __func__);
820 spin_unlock_irqrestore(&priv->lock, flags);
821 goto send;
822 } else
823 spin_unlock_irqrestore(&priv->lock, flags);
824
825 count = cypress_buf_get(priv->buf, &port->interrupt_out_buffer[offset],
826 port->interrupt_out_size-offset);
827
828 if (count == 0) {
829 return;
830 }
831
832 switch (priv->pkt_fmt) {
833 default:
834 case packet_format_1:
835 port->interrupt_out_buffer[1] = count;
836 break;
837 case packet_format_2:
838 port->interrupt_out_buffer[0] |= count;
839 }
840
841 dbg("%s - count is %d", __func__, count);
842
843 send:
844 spin_lock_irqsave(&priv->lock, flags);
845 priv->write_urb_in_use = 1;
846 spin_unlock_irqrestore(&priv->lock, flags);
847
848 if (priv->cmd_ctrl)
849 actual_size = 1;
850 else
851 actual_size = count +
852 (priv->pkt_fmt == packet_format_1 ? 2 : 1);
853
854 usb_serial_debug_data(debug, &port->dev, __func__, port->interrupt_out_size,
855 port->interrupt_out_urb->transfer_buffer);
856
857 usb_fill_int_urb(port->interrupt_out_urb, port->serial->dev,
858 usb_sndintpipe(port->serial->dev, port->interrupt_out_endpointAddress),
859 port->interrupt_out_buffer, port->interrupt_out_size,
860 cypress_write_int_callback, port, priv->write_urb_interval);
861 result = usb_submit_urb (port->interrupt_out_urb, GFP_ATOMIC);
862 if (result) {
863 dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __func__,
864 result);
865 priv->write_urb_in_use = 0;
866 cypress_set_dead(port);
867 }
868
869 spin_lock_irqsave(&priv->lock, flags);
870 if (priv->cmd_ctrl) {
871 priv->cmd_ctrl = 0;
872 }
873 priv->bytes_out += count; /* do not count the line control and size bytes */
874 spin_unlock_irqrestore(&priv->lock, flags);
875
876 usb_serial_port_softint(port);
877 } /* cypress_send */
878
879
880 /* returns how much space is available in the soft buffer */
881 static int cypress_write_room(struct usb_serial_port *port)
882 {
883 struct cypress_private *priv = usb_get_serial_port_data(port);
884 int room = 0;
885 unsigned long flags;
886
887 dbg("%s - port %d", __func__, port->number);
888
889 spin_lock_irqsave(&priv->lock, flags);
890 room = cypress_buf_space_avail(priv->buf);
891 spin_unlock_irqrestore(&priv->lock, flags);
892
893 dbg("%s - returns %d", __func__, room);
894 return room;
895 }
896
897
898 static int cypress_tiocmget (struct usb_serial_port *port, struct file *file)
899 {
900 struct cypress_private *priv = usb_get_serial_port_data(port);
901 __u8 status, control;
902 unsigned int result = 0;
903 unsigned long flags;
904
905 dbg("%s - port %d", __func__, port->number);
906
907 spin_lock_irqsave(&priv->lock, flags);
908 control = priv->line_control;
909 status = priv->current_status;
910 spin_unlock_irqrestore(&priv->lock, flags);
911
912 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
913 | ((control & CONTROL_RTS) ? TIOCM_RTS : 0)
914 | ((status & UART_CTS) ? TIOCM_CTS : 0)
915 | ((status & UART_DSR) ? TIOCM_DSR : 0)
916 | ((status & UART_RI) ? TIOCM_RI : 0)
917 | ((status & UART_CD) ? TIOCM_CD : 0);
918
919 dbg("%s - result = %x", __func__, result);
920
921 return result;
922 }
923
924
925 static int cypress_tiocmset (struct usb_serial_port *port, struct file *file,
926 unsigned int set, unsigned int clear)
927 {
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(port, NULL, 0);
946 }
947
948
949 static int cypress_ioctl (struct usb_serial_port *port, struct file * file, unsigned int cmd, unsigned long arg)
950 {
951 struct cypress_private *priv = usb_get_serial_port_data(port);
952
953 dbg("%s - port %d, cmd 0x%.4x", __func__, port->number, cmd);
954
955 switch (cmd) {
956 /* This code comes from drivers/char/serial.c and ftdi_sio.c */
957 case TIOCMIWAIT:
958 while (priv != NULL) {
959 interruptible_sleep_on(&priv->delta_msr_wait);
960 /* see if a signal did it */
961 if (signal_pending(current))
962 return -ERESTARTSYS;
963 else {
964 char diff = priv->diff_status;
965
966 if (diff == 0) {
967 return -EIO; /* no change => error */
968 }
969
970 /* consume all events */
971 priv->diff_status = 0;
972
973 /* return 0 if caller wanted to know about these bits */
974 if ( ((arg & TIOCM_RNG) && (diff & UART_RI)) ||
975 ((arg & TIOCM_DSR) && (diff & UART_DSR)) ||
976 ((arg & TIOCM_CD) && (diff & UART_CD)) ||
977 ((arg & TIOCM_CTS) && (diff & UART_CTS)) ) {
978 return 0;
979 }
980 /* otherwise caller can't care less about what happened,
981 * and so we continue to wait for more events.
982 */
983 }
984 }
985 return 0;
986 break;
987 default:
988 break;
989 }
990
991 dbg("%s - arg not supported - it was 0x%04x - check include/asm/ioctls.h", __func__, cmd);
992
993 return -ENOIOCTLCMD;
994 } /* cypress_ioctl */
995
996
997 static void cypress_set_termios (struct usb_serial_port *port,
998 struct ktermios *old_termios)
999 {
1000 struct cypress_private *priv = usb_get_serial_port_data(port);
1001 struct tty_struct *tty;
1002 int data_bits, stop_bits, parity_type, parity_enable;
1003 unsigned cflag, iflag;
1004 unsigned long flags;
1005 __u8 oldlines;
1006 int linechange = 0;
1007
1008 dbg("%s - port %d", __func__, port->number);
1009
1010 tty = port->tty;
1011
1012 spin_lock_irqsave(&priv->lock, flags);
1013 if (!priv->termios_initialized) {
1014 if (priv->chiptype == CT_EARTHMATE) {
1015 *(tty->termios) = tty_std_termios;
1016 tty->termios->c_cflag = B4800 | CS8 | CREAD | HUPCL |
1017 CLOCAL;
1018 tty->termios->c_ispeed = 4800;
1019 tty->termios->c_ospeed = 4800;
1020 } else if (priv->chiptype == CT_CYPHIDCOM) {
1021 *(tty->termios) = tty_std_termios;
1022 tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL |
1023 CLOCAL;
1024 tty->termios->c_ispeed = 9600;
1025 tty->termios->c_ospeed = 9600;
1026 } else if (priv->chiptype == CT_CA42V2) {
1027 *(tty->termios) = tty_std_termios;
1028 tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL |
1029 CLOCAL;
1030 tty->termios->c_ispeed = 9600;
1031 tty->termios->c_ospeed = 9600;
1032 }
1033 priv->termios_initialized = 1;
1034 }
1035 spin_unlock_irqrestore(&priv->lock, flags);
1036
1037 /* Unsupported features need clearing */
1038 tty->termios->c_cflag &= ~(CMSPAR|CRTSCTS);
1039
1040 cflag = tty->termios->c_cflag;
1041 iflag = tty->termios->c_iflag;
1042
1043 /* check if there are new settings */
1044 if (old_termios) {
1045 spin_lock_irqsave(&priv->lock, flags);
1046 priv->tmp_termios = *(tty->termios);
1047 spin_unlock_irqrestore(&priv->lock, flags);
1048 }
1049
1050 /* set number of data bits, parity, stop bits */
1051 /* when parity is disabled the parity type bit is ignored */
1052
1053 /* 1 means 2 stop bits, 0 means 1 stop bit */
1054 stop_bits = cflag & CSTOPB ? 1 : 0;
1055
1056 if (cflag & PARENB) {
1057 parity_enable = 1;
1058 /* 1 means odd parity, 0 means even parity */
1059 parity_type = cflag & PARODD ? 1 : 0;
1060 } else
1061 parity_enable = parity_type = 0;
1062
1063 if (cflag & CSIZE) {
1064 switch (cflag & CSIZE) {
1065 case CS5:
1066 data_bits = 0;
1067 break;
1068 case CS6:
1069 data_bits = 1;
1070 break;
1071 case CS7:
1072 data_bits = 2;
1073 break;
1074 case CS8:
1075 data_bits = 3;
1076 break;
1077 default:
1078 err("%s - CSIZE was set, but not CS5-CS8",
1079 __func__);
1080 data_bits = 3;
1081 }
1082 } else
1083 data_bits = 3;
1084
1085 spin_lock_irqsave(&priv->lock, flags);
1086 oldlines = priv->line_control;
1087 if ((cflag & CBAUD) == B0) {
1088 /* drop dtr and rts */
1089 dbg("%s - dropping the lines, baud rate 0bps", __func__);
1090 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
1091 } else
1092 priv->line_control = (CONTROL_DTR | CONTROL_RTS);
1093 spin_unlock_irqrestore(&priv->lock, flags);
1094
1095 dbg("%s - sending %d stop_bits, %d parity_enable, %d parity_type, "
1096 "%d data_bits (+5)", __func__, stop_bits,
1097 parity_enable, parity_type, data_bits);
1098
1099 cypress_serial_control(port, tty_get_baud_rate(tty), data_bits, stop_bits,
1100 parity_enable, parity_type, 0, CYPRESS_SET_CONFIG);
1101
1102 /* we perform a CYPRESS_GET_CONFIG so that the current settings are
1103 * filled into the private structure this should confirm that all is
1104 * working if it returns what we just set */
1105 cypress_serial_control(port, 0, 0, 0, 0, 0, 0, CYPRESS_GET_CONFIG);
1106
1107 /* Here we can define custom tty settings for devices; the main tty
1108 * termios flag base comes from empeg.c */
1109
1110 spin_lock_irqsave(&priv->lock, flags);
1111 if ( (priv->chiptype == CT_EARTHMATE) && (priv->baud_rate == 4800) ) {
1112 dbg("Using custom termios settings for a baud rate of "
1113 "4800bps.");
1114 /* define custom termios settings for NMEA protocol */
1115
1116 tty->termios->c_iflag /* input modes - */
1117 &= ~(IGNBRK /* disable ignore break */
1118 | BRKINT /* disable break causes interrupt */
1119 | PARMRK /* disable mark parity errors */
1120 | ISTRIP /* disable clear high bit of input char */
1121 | INLCR /* disable translate NL to CR */
1122 | IGNCR /* disable ignore CR */
1123 | ICRNL /* disable translate CR to NL */
1124 | IXON); /* disable enable XON/XOFF flow control */
1125
1126 tty->termios->c_oflag /* output modes */
1127 &= ~OPOST; /* disable postprocess output char */
1128
1129 tty->termios->c_lflag /* line discipline modes */
1130 &= ~(ECHO /* disable echo input characters */
1131 | ECHONL /* disable echo new line */
1132 | ICANON /* disable erase, kill, werase, and rprnt
1133 special characters */
1134 | ISIG /* disable interrupt, quit, and suspend
1135 special characters */
1136 | IEXTEN); /* disable non-POSIX special characters */
1137 } /* CT_CYPHIDCOM: Application should handle this for device */
1138
1139 linechange = (priv->line_control != oldlines);
1140 spin_unlock_irqrestore(&priv->lock, flags);
1141
1142 /* if necessary, set lines */
1143 if (linechange) {
1144 priv->cmd_ctrl = 1;
1145 cypress_write(port, NULL, 0);
1146 }
1147 } /* cypress_set_termios */
1148
1149
1150 /* returns amount of data still left in soft buffer */
1151 static int cypress_chars_in_buffer(struct usb_serial_port *port)
1152 {
1153 struct cypress_private *priv = usb_get_serial_port_data(port);
1154 int chars = 0;
1155 unsigned long flags;
1156
1157 dbg("%s - port %d", __func__, port->number);
1158
1159 spin_lock_irqsave(&priv->lock, flags);
1160 chars = cypress_buf_data_avail(priv->buf);
1161 spin_unlock_irqrestore(&priv->lock, flags);
1162
1163 dbg("%s - returns %d", __func__, chars);
1164 return chars;
1165 }
1166
1167
1168 static void cypress_throttle (struct usb_serial_port *port)
1169 {
1170 struct cypress_private *priv = usb_get_serial_port_data(port);
1171 unsigned long flags;
1172
1173 dbg("%s - port %d", __func__, port->number);
1174
1175 spin_lock_irqsave(&priv->lock, flags);
1176 priv->rx_flags = THROTTLED;
1177 spin_unlock_irqrestore(&priv->lock, flags);
1178 }
1179
1180
1181 static void cypress_unthrottle (struct usb_serial_port *port)
1182 {
1183 struct cypress_private *priv = usb_get_serial_port_data(port);
1184 int actually_throttled, result;
1185 unsigned long flags;
1186
1187 dbg("%s - port %d", __func__, port->number);
1188
1189 spin_lock_irqsave(&priv->lock, flags);
1190 actually_throttled = priv->rx_flags & ACTUALLY_THROTTLED;
1191 priv->rx_flags = 0;
1192 spin_unlock_irqrestore(&priv->lock, flags);
1193
1194 if (!priv->comm_is_ok)
1195 return;
1196
1197 if (actually_throttled) {
1198 port->interrupt_in_urb->dev = port->serial->dev;
1199
1200 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
1201 if (result) {
1202 dev_err(&port->dev, "%s - failed submitting read urb, "
1203 "error %d\n", __func__, result);
1204 cypress_set_dead(port);
1205 }
1206 }
1207 }
1208
1209
1210 static void cypress_read_int_callback(struct urb *urb)
1211 {
1212 struct usb_serial_port *port = urb->context;
1213 struct cypress_private *priv = usb_get_serial_port_data(port);
1214 struct tty_struct *tty;
1215 unsigned char *data = urb->transfer_buffer;
1216 unsigned long flags;
1217 char tty_flag = TTY_NORMAL;
1218 int havedata = 0;
1219 int bytes = 0;
1220 int result;
1221 int i = 0;
1222 int status = urb->status;
1223
1224 dbg("%s - port %d", __func__, port->number);
1225
1226 switch (status) {
1227 case 0: /* success */
1228 break;
1229 case -ECONNRESET:
1230 case -ENOENT:
1231 case -ESHUTDOWN:
1232 /* precursor to disconnect so just go away */
1233 return;
1234 case -EPIPE:
1235 usb_clear_halt(port->serial->dev,0x81);
1236 break;
1237 default:
1238 /* something ugly is going on... */
1239 dev_err(&urb->dev->dev,"%s - unexpected nonzero read status received: %d\n",
1240 __func__, status);
1241 cypress_set_dead(port);
1242 return;
1243 }
1244
1245 spin_lock_irqsave(&priv->lock, flags);
1246 if (priv->rx_flags & THROTTLED) {
1247 dbg("%s - now throttling", __func__);
1248 priv->rx_flags |= ACTUALLY_THROTTLED;
1249 spin_unlock_irqrestore(&priv->lock, flags);
1250 return;
1251 }
1252 spin_unlock_irqrestore(&priv->lock, flags);
1253
1254 tty = port->tty;
1255 if (!tty) {
1256 dbg("%s - bad tty pointer - exiting", __func__);
1257 return;
1258 }
1259
1260 spin_lock_irqsave(&priv->lock, flags);
1261 result = urb->actual_length;
1262 switch (priv->pkt_fmt) {
1263 default:
1264 case packet_format_1:
1265 /* This is for the CY7C64013... */
1266 priv->current_status = data[0] & 0xF8;
1267 bytes = data[1] + 2;
1268 i = 2;
1269 if (bytes > 2)
1270 havedata = 1;
1271 break;
1272 case packet_format_2:
1273 /* This is for the CY7C63743... */
1274 priv->current_status = data[0] & 0xF8;
1275 bytes = (data[0] & 0x07) + 1;
1276 i = 1;
1277 if (bytes > 1)
1278 havedata = 1;
1279 break;
1280 }
1281 spin_unlock_irqrestore(&priv->lock, flags);
1282 if (result < bytes) {
1283 dbg("%s - wrong packet size - received %d bytes but packet "
1284 "said %d bytes", __func__, result, bytes);
1285 goto continue_read;
1286 }
1287
1288 usb_serial_debug_data (debug, &port->dev, __func__,
1289 urb->actual_length, data);
1290
1291 spin_lock_irqsave(&priv->lock, flags);
1292 /* check to see if status has changed */
1293 if (priv->current_status != priv->prev_status) {
1294 priv->diff_status |= priv->current_status ^
1295 priv->prev_status;
1296 wake_up_interruptible(&priv->delta_msr_wait);
1297 priv->prev_status = priv->current_status;
1298 }
1299 spin_unlock_irqrestore(&priv->lock, flags);
1300
1301 /* hangup, as defined in acm.c... this might be a bad place for it
1302 * though */
1303 if (tty && !(tty->termios->c_cflag & CLOCAL) &&
1304 !(priv->current_status & UART_CD)) {
1305 dbg("%s - calling hangup", __func__);
1306 tty_hangup(tty);
1307 goto continue_read;
1308 }
1309
1310 /* There is one error bit... I'm assuming it is a parity error
1311 * indicator as the generic firmware will set this bit to 1 if a
1312 * parity error occurs.
1313 * I can not find reference to any other error events. */
1314 spin_lock_irqsave(&priv->lock, flags);
1315 if (priv->current_status & CYP_ERROR) {
1316 spin_unlock_irqrestore(&priv->lock, flags);
1317 tty_flag = TTY_PARITY;
1318 dbg("%s - Parity Error detected", __func__);
1319 } else
1320 spin_unlock_irqrestore(&priv->lock, flags);
1321
1322 /* process read if there is data other than line status */
1323 if (tty && (bytes > i)) {
1324 bytes = tty_buffer_request_room(tty, bytes);
1325 for (; i < bytes ; ++i) {
1326 dbg("pushing byte number %d - %d - %c", i, data[i],
1327 data[i]);
1328 tty_insert_flip_char(tty, data[i], tty_flag);
1329 }
1330 tty_flip_buffer_push(port->tty);
1331 }
1332
1333 spin_lock_irqsave(&priv->lock, flags);
1334 /* control and status byte(s) are also counted */
1335 priv->bytes_in += bytes;
1336 spin_unlock_irqrestore(&priv->lock, flags);
1337
1338 continue_read:
1339
1340 /* Continue trying to always read... unless the port has closed. */
1341
1342 if (port->open_count > 0 && priv->comm_is_ok) {
1343 usb_fill_int_urb(port->interrupt_in_urb, port->serial->dev,
1344 usb_rcvintpipe(port->serial->dev,
1345 port->interrupt_in_endpointAddress),
1346 port->interrupt_in_urb->transfer_buffer,
1347 port->interrupt_in_urb->transfer_buffer_length,
1348 cypress_read_int_callback, port, priv->read_urb_interval);
1349 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
1350 if (result) {
1351 dev_err(&urb->dev->dev, "%s - failed resubmitting "
1352 "read urb, error %d\n", __func__,
1353 result);
1354 cypress_set_dead(port);
1355 }
1356 }
1357
1358 return;
1359 } /* cypress_read_int_callback */
1360
1361
1362 static void cypress_write_int_callback(struct urb *urb)
1363 {
1364 struct usb_serial_port *port = urb->context;
1365 struct cypress_private *priv = usb_get_serial_port_data(port);
1366 int result;
1367 int status = urb->status;
1368
1369 dbg("%s - port %d", __func__, port->number);
1370
1371 switch (status) {
1372 case 0:
1373 /* success */
1374 break;
1375 case -ECONNRESET:
1376 case -ENOENT:
1377 case -ESHUTDOWN:
1378 /* this urb is terminated, clean up */
1379 dbg("%s - urb shutting down with status: %d",
1380 __func__, status);
1381 priv->write_urb_in_use = 0;
1382 return;
1383 case -EPIPE: /* no break needed; clear halt and resubmit */
1384 if (!priv->comm_is_ok)
1385 break;
1386 usb_clear_halt(port->serial->dev, 0x02);
1387 /* error in the urb, so we have to resubmit it */
1388 dbg("%s - nonzero write bulk status received: %d",
1389 __func__, status);
1390 port->interrupt_out_urb->transfer_buffer_length = 1;
1391 port->interrupt_out_urb->dev = port->serial->dev;
1392 result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC);
1393 if (!result)
1394 return;
1395 dev_err(&urb->dev->dev, "%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,"%s - unexpected nonzero write status received: %d\n",
1401 __func__, status);
1402 cypress_set_dead(port);
1403 break;
1404 }
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) % cb->buf_size);
1490 else
1491 return 0;
1492 }
1493
1494
1495 /*
1496 * cypress_buf_space_avail
1497 *
1498 * Return the number of bytes of space available in the circular
1499 * buffer.
1500 */
1501
1502 static unsigned int cypress_buf_space_avail(struct cypress_buf *cb)
1503 {
1504 if (cb != NULL)
1505 return ((cb->buf_size + cb->buf_get - cb->buf_put - 1) % cb->buf_size);
1506 else
1507 return 0;
1508 }
1509
1510
1511 /*
1512 * cypress_buf_put
1513 *
1514 * Copy data data from a user buffer and put it into the circular buffer.
1515 * Restrict to the amount of space available.
1516 *
1517 * Return the number of bytes copied.
1518 */
1519
1520 static unsigned int cypress_buf_put(struct cypress_buf *cb, const char *buf,
1521 unsigned int count)
1522 {
1523
1524 unsigned int len;
1525
1526
1527 if (cb == NULL)
1528 return 0;
1529
1530 len = cypress_buf_space_avail(cb);
1531 if (count > len)
1532 count = len;
1533
1534 if (count == 0)
1535 return 0;
1536
1537 len = cb->buf_buf + cb->buf_size - cb->buf_put;
1538 if (count > len) {
1539 memcpy(cb->buf_put, buf, len);
1540 memcpy(cb->buf_buf, buf+len, count - len);
1541 cb->buf_put = cb->buf_buf + count - len;
1542 } else {
1543 memcpy(cb->buf_put, buf, count);
1544 if (count < len)
1545 cb->buf_put += count;
1546 else /* count == len */
1547 cb->buf_put = cb->buf_buf;
1548 }
1549
1550 return count;
1551
1552 }
1553
1554
1555 /*
1556 * cypress_buf_get
1557 *
1558 * Get data from the circular buffer and copy to the given buffer.
1559 * Restrict to the amount of data available.
1560 *
1561 * Return the number of bytes copied.
1562 */
1563
1564 static unsigned int cypress_buf_get(struct cypress_buf *cb, char *buf,
1565 unsigned int count)
1566 {
1567
1568 unsigned int len;
1569
1570
1571 if (cb == NULL)
1572 return 0;
1573
1574 len = cypress_buf_data_avail(cb);
1575 if (count > len)
1576 count = len;
1577
1578 if (count == 0)
1579 return 0;
1580
1581 len = cb->buf_buf + cb->buf_size - cb->buf_get;
1582 if (count > len) {
1583 memcpy(buf, cb->buf_get, len);
1584 memcpy(buf+len, cb->buf_buf, count - len);
1585 cb->buf_get = cb->buf_buf + count - len;
1586 } else {
1587 memcpy(buf, cb->buf_get, count);
1588 if (count < len)
1589 cb->buf_get += count;
1590 else /* count == len */
1591 cb->buf_get = cb->buf_buf;
1592 }
1593
1594 return count;
1595
1596 }
1597
1598 /*****************************************************************************
1599 * Module functions
1600 *****************************************************************************/
1601
1602 static int __init cypress_init(void)
1603 {
1604 int retval;
1605
1606 dbg("%s", __func__);
1607
1608 retval = usb_serial_register(&cypress_earthmate_device);
1609 if (retval)
1610 goto failed_em_register;
1611 retval = usb_serial_register(&cypress_hidcom_device);
1612 if (retval)
1613 goto failed_hidcom_register;
1614 retval = usb_serial_register(&cypress_ca42v2_device);
1615 if (retval)
1616 goto failed_ca42v2_register;
1617 retval = usb_register(&cypress_driver);
1618 if (retval)
1619 goto failed_usb_register;
1620
1621 info(DRIVER_DESC " " DRIVER_VERSION);
1622 return 0;
1623
1624 failed_usb_register:
1625 usb_serial_deregister(&cypress_ca42v2_device);
1626 failed_ca42v2_register:
1627 usb_serial_deregister(&cypress_hidcom_device);
1628 failed_hidcom_register:
1629 usb_serial_deregister(&cypress_earthmate_device);
1630 failed_em_register:
1631 return retval;
1632 }
1633
1634
1635 static void __exit cypress_exit (void)
1636 {
1637 dbg("%s", __func__);
1638
1639 usb_deregister (&cypress_driver);
1640 usb_serial_deregister (&cypress_earthmate_device);
1641 usb_serial_deregister (&cypress_hidcom_device);
1642 usb_serial_deregister (&cypress_ca42v2_device);
1643 }
1644
1645
1646 module_init(cypress_init);
1647 module_exit(cypress_exit);
1648
1649 MODULE_AUTHOR( DRIVER_AUTHOR );
1650 MODULE_DESCRIPTION( DRIVER_DESC );
1651 MODULE_VERSION( DRIVER_VERSION );
1652 MODULE_LICENSE("GPL");
1653
1654 module_param(debug, bool, S_IRUGO | S_IWUSR);
1655 MODULE_PARM_DESC(debug, "Debug enabled or not");
1656 module_param(stats, bool, S_IRUGO | S_IWUSR);
1657 MODULE_PARM_DESC(stats, "Enable statistics or not");
1658 module_param(interval, int, S_IRUGO | S_IWUSR);
1659 MODULE_PARM_DESC(interval, "Overrides interrupt interval");
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