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 *
20 * Lonnie Mendez <dignome@gmail.com>
21 * 12-15-2004
22 * Incorporated write buffering from pl2303 driver. Fixed bug with line
23 * handling so both lines are raised in cypress_open. (was dropping rts)
24 * Various code cleanups made as well along with other misc bug fixes.
25 *
26 * Lonnie Mendez <dignome@gmail.com>
27 * 04-10-2004
28 * Driver modified to support dynamic line settings. Various improvments
29 * and features.
30 *
31 * Neil Whelchel
32 * 10-2003
33 * Driver first released.
34 *
35 *
36 * Long Term TODO:
37 * Improve transfer speeds - both read/write are somewhat slow
38 * at this point.
39 * Improve debugging. Show modem line status with debug output and
40 * implement filtering for certain data as a module parameter.
41 */
42
43 /* Thanks to Neil Whelchel for writing the first cypress m8 implementation for linux. */
44 /* Thanks to cypress for providing references for the hid reports. */
45 /* Thanks to Jiang Zhang for providing links and for general help. */
46 /* Code originates and was built up from ftdi_sio, belkin, pl2303 and others. */
47
48
49 #include <linux/config.h>
50 #include <linux/kernel.h>
51 #include <linux/errno.h>
52 #include <linux/init.h>
53 #include <linux/slab.h>
54 #include <linux/tty.h>
55 #include <linux/tty_driver.h>
56 #include <linux/tty_flip.h>
57 #include <linux/module.h>
58 #include <linux/moduleparam.h>
59 #include <linux/spinlock.h>
60 #include <asm/uaccess.h>
61 #include <linux/usb.h>
62 #include <linux/serial.h>
63
64 #include "usb-serial.h"
65 #include "cypress_m8.h"
66
67
68 #ifdef CONFIG_USB_SERIAL_DEBUG
69 static int debug = 1;
70 #else
71 static int debug;
72 #endif
73 static int stats;
74
75 /*
76 * Version Information
77 */
78 #define DRIVER_VERSION "v1.08"
79 #define DRIVER_AUTHOR "Lonnie Mendez <dignome@gmail.com>, Neil Whelchel <koyama@firstlight.net>"
80 #define DRIVER_DESC "Cypress USB to Serial Driver"
81
82 /* write buffer size defines */
83 #define CYPRESS_BUF_SIZE 1024
84 #define CYPRESS_CLOSING_WAIT (30*HZ)
85
86 static struct usb_device_id id_table_earthmate [] = {
87 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
88 { } /* Terminating entry */
89 };
90
91 static struct usb_device_id id_table_cyphidcomrs232 [] = {
92 { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
93 { } /* Terminating entry */
94 };
95
96 static struct usb_device_id id_table_combined [] = {
97 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
98 { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
99 { } /* Terminating entry */
100 };
101
102 MODULE_DEVICE_TABLE (usb, id_table_combined);
103
104 static struct usb_driver cypress_driver = {
105 .name = "cypress",
106 .probe = usb_serial_probe,
107 .disconnect = usb_serial_disconnect,
108 .id_table = id_table_combined,
109 };
110
111 struct cypress_private {
112 spinlock_t lock; /* private lock */
113 int chiptype; /* identifier of device, for quirks/etc */
114 int bytes_in; /* used for statistics */
115 int bytes_out; /* used for statistics */
116 int cmd_count; /* used for statistics */
117 int cmd_ctrl; /* always set this to 1 before issuing a command */
118 struct cypress_buf *buf; /* write buffer */
119 int write_urb_in_use; /* write urb in use indicator */
120 int termios_initialized;
121 __u8 line_control; /* holds dtr / rts value */
122 __u8 current_status; /* received from last read - info on dsr,cts,cd,ri,etc */
123 __u8 current_config; /* stores the current configuration byte */
124 __u8 rx_flags; /* throttling - used from whiteheat/ftdi_sio */
125 int baud_rate; /* stores current baud rate in integer form */
126 int cbr_mask; /* stores current baud rate in masked form */
127 int isthrottled; /* if throttled, discard reads */
128 wait_queue_head_t delta_msr_wait; /* used for TIOCMIWAIT */
129 char prev_status, diff_status; /* used for TIOCMIWAIT */
130 /* we pass a pointer to this as the arguement sent to cypress_set_termios old_termios */
131 struct termios tmp_termios; /* stores the old termios settings */
132 char calledfromopen; /* used when issuing lines on open - fixes rts drop bug */
133 };
134
135 /* write buffer structure */
136 struct cypress_buf {
137 unsigned int buf_size;
138 char *buf_buf;
139 char *buf_get;
140 char *buf_put;
141 };
142
143 /* function prototypes for the Cypress USB to serial device */
144 static int cypress_earthmate_startup (struct usb_serial *serial);
145 static int cypress_hidcom_startup (struct usb_serial *serial);
146 static void cypress_shutdown (struct usb_serial *serial);
147 static int cypress_open (struct usb_serial_port *port, struct file *filp);
148 static void cypress_close (struct usb_serial_port *port, struct file *filp);
149 static int cypress_write (struct usb_serial_port *port, const unsigned char *buf, int count);
150 static void cypress_send (struct usb_serial_port *port);
151 static int cypress_write_room (struct usb_serial_port *port);
152 static int cypress_ioctl (struct usb_serial_port *port, struct file * file, unsigned int cmd, unsigned long arg);
153 static void cypress_set_termios (struct usb_serial_port *port, struct termios * old);
154 static int cypress_tiocmget (struct usb_serial_port *port, struct file *file);
155 static int cypress_tiocmset (struct usb_serial_port *port, struct file *file, unsigned int set, unsigned int clear);
156 static int cypress_chars_in_buffer (struct usb_serial_port *port);
157 static void cypress_throttle (struct usb_serial_port *port);
158 static void cypress_unthrottle (struct usb_serial_port *port);
159 static void cypress_read_int_callback (struct urb *urb, struct pt_regs *regs);
160 static void cypress_write_int_callback (struct urb *urb, struct pt_regs *regs);
161 /* baud helper functions */
162 static int mask_to_rate (unsigned mask);
163 static unsigned rate_to_mask (int rate);
164 /* write buffer functions */
165 static struct cypress_buf *cypress_buf_alloc(unsigned int size);
166 static void cypress_buf_free(struct cypress_buf *cb);
167 static void cypress_buf_clear(struct cypress_buf *cb);
168 static unsigned int cypress_buf_data_avail(struct cypress_buf *cb);
169 static unsigned int cypress_buf_space_avail(struct cypress_buf *cb);
170 static unsigned int cypress_buf_put(struct cypress_buf *cb, const char *buf,
171 unsigned int count);
172 static unsigned int cypress_buf_get(struct cypress_buf *cb, char *buf,
173 unsigned int count);
174
175
176 static struct usb_serial_device_type cypress_earthmate_device = {
177 .owner = THIS_MODULE,
178 .name = "DeLorme Earthmate USB",
179 .short_name = "earthmate",
180 .id_table = id_table_earthmate,
181 .num_interrupt_in = 1,
182 .num_interrupt_out = 1,
183 .num_bulk_in = NUM_DONT_CARE,
184 .num_bulk_out = NUM_DONT_CARE,
185 .num_ports = 1,
186 .attach = cypress_earthmate_startup,
187 .shutdown = cypress_shutdown,
188 .open = cypress_open,
189 .close = cypress_close,
190 .write = cypress_write,
191 .write_room = cypress_write_room,
192 .ioctl = cypress_ioctl,
193 .set_termios = cypress_set_termios,
194 .tiocmget = cypress_tiocmget,
195 .tiocmset = cypress_tiocmset,
196 .chars_in_buffer = cypress_chars_in_buffer,
197 .throttle = cypress_throttle,
198 .unthrottle = cypress_unthrottle,
199 .read_int_callback = cypress_read_int_callback,
200 .write_int_callback = cypress_write_int_callback,
201 };
202
203 static struct usb_serial_device_type cypress_hidcom_device = {
204 .owner = THIS_MODULE,
205 .name = "HID->COM RS232 Adapter",
206 .short_name = "cyphidcom",
207 .id_table = id_table_cyphidcomrs232,
208 .num_interrupt_in = 1,
209 .num_interrupt_out = 1,
210 .num_bulk_in = NUM_DONT_CARE,
211 .num_bulk_out = NUM_DONT_CARE,
212 .num_ports = 1,
213 .attach = cypress_hidcom_startup,
214 .shutdown = cypress_shutdown,
215 .open = cypress_open,
216 .close = cypress_close,
217 .write = cypress_write,
218 .write_room = cypress_write_room,
219 .ioctl = cypress_ioctl,
220 .set_termios = cypress_set_termios,
221 .tiocmget = cypress_tiocmget,
222 .tiocmset = cypress_tiocmset,
223 .chars_in_buffer = cypress_chars_in_buffer,
224 .throttle = cypress_throttle,
225 .unthrottle = cypress_unthrottle,
226 .read_int_callback = cypress_read_int_callback,
227 .write_int_callback = cypress_write_int_callback,
228 };
229
230
231 /*****************************************************************************
232 * Cypress serial helper functions
233 *****************************************************************************/
234
235
236 /* This function can either set or retreive the current serial line settings */
237 static int cypress_serial_control (struct usb_serial_port *port, unsigned baud_mask, int data_bits, int stop_bits,
238 int parity_enable, int parity_type, int reset, int cypress_request_type)
239 {
240 int i, n_baud_rate = 0, retval = 0;
241 struct cypress_private *priv;
242 __u8 feature_buffer[5];
243 __u8 config;
244 unsigned long flags;
245
246 dbg("%s", __FUNCTION__);
247
248 priv = usb_get_serial_port_data(port);
249
250 switch(cypress_request_type) {
251 case CYPRESS_SET_CONFIG:
252
253 /*
254 * The general purpose firmware for the Cypress M8 allows for a maximum speed
255 * of 57600bps (I have no idea whether DeLorme chose to use the general purpose
256 * firmware or not), if you need to modify this speed setting for your own
257 * project please add your own chiptype and modify the code likewise. The
258 * Cypress HID->COM device will work successfully up to 115200bps.
259 */
260 if (baud_mask != priv->cbr_mask) {
261 dbg("%s - baud rate is changing", __FUNCTION__);
262 if ( priv->chiptype == CT_EARTHMATE ) {
263 /* 300 and 600 baud rates are supported under the generic firmware,
264 * but are not used with NMEA and SiRF protocols */
265
266 if ( (baud_mask == B300) || (baud_mask == B600) ) {
267 err("%s - failed setting baud rate, unsupported speed (default to 4800)",
268 __FUNCTION__);
269 n_baud_rate = 4800;
270 } else if ( (n_baud_rate = mask_to_rate(baud_mask)) == -1) {
271 err("%s - failed setting baud rate, unsupported speed (default to 4800)",
272 __FUNCTION__);
273 n_baud_rate = 4800;
274 }
275 } else if (priv->chiptype == CT_CYPHIDCOM) {
276 if ( (n_baud_rate = mask_to_rate(baud_mask)) == -1) {
277 err("%s - failed setting baud rate, unsupported speed (default to 4800)",
278 __FUNCTION__);
279 n_baud_rate = 4800;
280 }
281 } else if (priv->chiptype == CT_GENERIC) {
282 if ( (n_baud_rate = mask_to_rate(baud_mask)) == -1) {
283 err("%s - failed setting baud rate, unsupported speed (default to 4800)",
284 __FUNCTION__);
285 n_baud_rate = 4800;
286 }
287 } else {
288 info("%s - please define your chiptype, using 4800bps default", __FUNCTION__);
289 n_baud_rate = 4800;
290 }
291 } else { /* baud rate not changing, keep the old */
292 n_baud_rate = priv->baud_rate;
293 }
294 dbg("%s - baud rate is being sent as %d", __FUNCTION__, n_baud_rate);
295
296
297 /*
298 * This algorithm accredited to Jiang Jay Zhang... thanks for all the help!
299 */
300 for (i = 0; i < 4; ++i) {
301 feature_buffer[i] = ( n_baud_rate >> (i*8) & 0xFF );
302 }
303
304 config = 0; // reset config byte
305 config |= data_bits; // assign data bits in 2 bit space ( max 3 )
306 /* 1 bit gap */
307 config |= (stop_bits << 3); // assign stop bits in 1 bit space
308 config |= (parity_enable << 4); // assign parity flag in 1 bit space
309 config |= (parity_type << 5); // assign parity type in 1 bit space
310 /* 1 bit gap */
311 config |= (reset << 7); // assign reset at end of byte, 1 bit space
312
313 feature_buffer[4] = config;
314
315 dbg("%s - device is being sent this feature report:", __FUNCTION__);
316 dbg("%s - %02X - %02X - %02X - %02X - %02X", __FUNCTION__, feature_buffer[0], feature_buffer[1],
317 feature_buffer[2], feature_buffer[3], feature_buffer[4]);
318
319 retval = usb_control_msg (port->serial->dev, usb_sndctrlpipe(port->serial->dev, 0),
320 HID_REQ_SET_REPORT, USB_DIR_OUT | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
321 0x0300, 0, feature_buffer, 5, 500);
322
323 if (retval != 5)
324 err("%s - failed sending serial line settings - %d", __FUNCTION__, retval);
325 else {
326 spin_lock_irqsave(&priv->lock, flags);
327 priv->baud_rate = n_baud_rate;
328 priv->cbr_mask = baud_mask;
329 priv->current_config = config;
330 ++priv->cmd_count;
331 spin_unlock_irqrestore(&priv->lock, flags);
332 }
333 break;
334 case CYPRESS_GET_CONFIG:
335 dbg("%s - retreiving serial line settings", __FUNCTION__);
336 /* reset values in feature buffer */
337 memset(feature_buffer, 0, 5);
338
339 retval = usb_control_msg (port->serial->dev, usb_rcvctrlpipe(port->serial->dev, 0),
340 HID_REQ_GET_REPORT, USB_DIR_IN | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
341 0x0300, 0, feature_buffer, 5, 500);
342 if (retval != 5) {
343 err("%s - failed to retreive serial line settings - %d", __FUNCTION__, retval);
344 return retval;
345 } else {
346 spin_lock_irqsave(&priv->lock, flags);
347 /* store the config in one byte, and later use bit masks to check values */
348 priv->current_config = feature_buffer[4];
349 /* reverse the process above to get the baud_mask value */
350 n_baud_rate = 0; // reset bits
351 for (i = 0; i < 4; ++i) {
352 n_baud_rate |= ( feature_buffer[i] << (i*8) );
353 }
354
355 priv->baud_rate = n_baud_rate;
356 if ( (priv->cbr_mask = rate_to_mask(n_baud_rate)) == 0x40)
357 dbg("%s - failed setting the baud mask (not defined)", __FUNCTION__);
358 ++priv->cmd_count;
359 spin_unlock_irqrestore(&priv->lock, flags);
360 }
361 break;
362 default:
363 err("%s - unsupported serial control command issued", __FUNCTION__);
364 }
365 return retval;
366 } /* cypress_serial_control */
367
368
369 /* given a baud mask, it will return speed on success */
370 static int mask_to_rate (unsigned mask)
371 {
372 int rate;
373
374 switch (mask) {
375 case B0: rate = 0; break;
376 case B300: rate = 300; break;
377 case B600: rate = 600; break;
378 case B1200: rate = 1200; break;
379 case B2400: rate = 2400; break;
380 case B4800: rate = 4800; break;
381 case B9600: rate = 9600; break;
382 case B19200: rate = 19200; break;
383 case B38400: rate = 38400; break;
384 case B57600: rate = 57600; break;
385 case B115200: rate = 115200; break;
386 default: rate = -1;
387 }
388
389 return rate;
390 }
391
392
393 static unsigned rate_to_mask (int rate)
394 {
395 unsigned mask;
396
397 switch (rate) {
398 case 0: mask = B0; break;
399 case 300: mask = B300; break;
400 case 600: mask = B600; break;
401 case 1200: mask = B1200; break;
402 case 2400: mask = B2400; break;
403 case 4800: mask = B4800; break;
404 case 9600: mask = B9600; break;
405 case 19200: mask = B19200; break;
406 case 38400: mask = B38400; break;
407 case 57600: mask = B57600; break;
408 case 115200: mask = B115200; break;
409 default: mask = 0x40;
410 }
411
412 return mask;
413 }
414 /*****************************************************************************
415 * Cypress serial driver functions
416 *****************************************************************************/
417
418
419 static int generic_startup (struct usb_serial *serial)
420 {
421 struct cypress_private *priv;
422
423 dbg("%s - port %d", __FUNCTION__, serial->port[0]->number);
424
425 priv = kmalloc(sizeof (struct cypress_private), GFP_KERNEL);
426 if (!priv)
427 return -ENOMEM;
428
429 memset(priv, 0x00, sizeof (struct cypress_private));
430 spin_lock_init(&priv->lock);
431 priv->buf = cypress_buf_alloc(CYPRESS_BUF_SIZE);
432 if (priv->buf == NULL) {
433 kfree(priv);
434 return -ENOMEM;
435 }
436 init_waitqueue_head(&priv->delta_msr_wait);
437
438 usb_reset_configuration (serial->dev);
439
440 priv->cmd_ctrl = 0;
441 priv->line_control = 0;
442 priv->termios_initialized = 0;
443 priv->calledfromopen = 0;
444 priv->rx_flags = 0;
445 usb_set_serial_port_data(serial->port[0], priv);
446
447 return (0);
448 }
449
450
451 static int cypress_earthmate_startup (struct usb_serial *serial)
452 {
453 struct cypress_private *priv;
454
455 dbg("%s", __FUNCTION__);
456
457 if (generic_startup(serial)) {
458 dbg("%s - Failed setting up port %d", __FUNCTION__, serial->port[0]->number);
459 return 1;
460 }
461
462 priv = usb_get_serial_port_data(serial->port[0]);
463 priv->chiptype = CT_EARTHMATE;
464
465 return (0);
466 } /* cypress_earthmate_startup */
467
468
469 static int cypress_hidcom_startup (struct usb_serial *serial)
470 {
471 struct cypress_private *priv;
472
473 dbg("%s", __FUNCTION__);
474
475 if (generic_startup(serial)) {
476 dbg("%s - Failed setting up port %d", __FUNCTION__, serial->port[0]->number);
477 return 1;
478 }
479
480 priv = usb_get_serial_port_data(serial->port[0]);
481 priv->chiptype = CT_CYPHIDCOM;
482
483 return (0);
484 } /* cypress_hidcom_startup */
485
486
487 static void cypress_shutdown (struct usb_serial *serial)
488 {
489 struct cypress_private *priv;
490
491 dbg ("%s - port %d", __FUNCTION__, serial->port[0]->number);
492
493 /* all open ports are closed at this point */
494
495 priv = usb_get_serial_port_data(serial->port[0]);
496
497 if (priv) {
498 cypress_buf_free(priv->buf);
499 kfree(priv);
500 usb_set_serial_port_data(serial->port[0], NULL);
501 }
502 }
503
504
505 static int cypress_open (struct usb_serial_port *port, struct file *filp)
506 {
507 struct cypress_private *priv = usb_get_serial_port_data(port);
508 struct usb_serial *serial = port->serial;
509 unsigned long flags;
510 int result = 0;
511
512 dbg("%s - port %d", __FUNCTION__, port->number);
513
514 /* clear halts before open */
515 usb_clear_halt(serial->dev, 0x00);
516 usb_clear_halt(serial->dev, 0x81);
517 usb_clear_halt(serial->dev, 0x02);
518
519 spin_lock_irqsave(&priv->lock, flags);
520 /* reset read/write statistics */
521 priv->bytes_in = 0;
522 priv->bytes_out = 0;
523 priv->cmd_count = 0;
524 priv->rx_flags = 0;
525 spin_unlock_irqrestore(&priv->lock, flags);
526
527 /* setting to zero could cause data loss */
528 port->tty->low_latency = 1;
529
530 /* raise both lines and set termios */
531 spin_lock_irqsave(&priv->lock, flags);
532 priv->line_control = CONTROL_DTR | CONTROL_RTS;
533 priv->calledfromopen = 1;
534 priv->cmd_ctrl = 1;
535 spin_unlock_irqrestore(&priv->lock, flags);
536 result = cypress_write(port, NULL, 0);
537
538 if (result) {
539 dev_err(&port->dev, "%s - failed setting the control lines - error %d\n", __FUNCTION__, result);
540 return result;
541 } else
542 dbg("%s - success setting the control lines", __FUNCTION__);
543
544 cypress_set_termios(port, &priv->tmp_termios);
545
546 /* setup the port and start reading from the device */
547 if(!port->interrupt_in_urb){
548 err("%s - interrupt_in_urb is empty!", __FUNCTION__);
549 return(-1);
550 }
551
552 usb_fill_int_urb(port->interrupt_in_urb, serial->dev,
553 usb_rcvintpipe(serial->dev, port->interrupt_in_endpointAddress),
554 port->interrupt_in_urb->transfer_buffer, port->interrupt_in_urb->transfer_buffer_length,
555 cypress_read_int_callback, port, port->interrupt_in_urb->interval);
556 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
557
558 if (result){
559 dev_err(&port->dev, "%s - failed submitting read urb, error %d\n", __FUNCTION__, result);
560 }
561
562 return result;
563 } /* cypress_open */
564
565
566 static void cypress_close(struct usb_serial_port *port, struct file * filp)
567 {
568 struct cypress_private *priv = usb_get_serial_port_data(port);
569 unsigned int c_cflag;
570 unsigned long flags;
571 int bps;
572 long timeout;
573 wait_queue_t wait;
574
575 dbg("%s - port %d", __FUNCTION__, port->number);
576
577 /* wait for data to drain from buffer */
578 spin_lock_irqsave(&priv->lock, flags);
579 timeout = CYPRESS_CLOSING_WAIT;
580 init_waitqueue_entry(&wait, current);
581 add_wait_queue(&port->tty->write_wait, &wait);
582 for (;;) {
583 set_current_state(TASK_INTERRUPTIBLE);
584 if (cypress_buf_data_avail(priv->buf) == 0
585 || timeout == 0 || signal_pending(current)
586 || !usb_get_intfdata(port->serial->interface))
587 break;
588 spin_unlock_irqrestore(&priv->lock, flags);
589 timeout = schedule_timeout(timeout);
590 spin_lock_irqsave(&priv->lock, flags);
591 }
592 set_current_state(TASK_RUNNING);
593 remove_wait_queue(&port->tty->write_wait, &wait);
594 /* clear out any remaining data in the buffer */
595 cypress_buf_clear(priv->buf);
596 spin_unlock_irqrestore(&priv->lock, flags);
597
598 /* wait for characters to drain from device */
599 bps = tty_get_baud_rate(port->tty);
600 if (bps > 1200)
601 timeout = max((HZ*2560)/bps,HZ/10);
602 else
603 timeout = 2*HZ;
604 set_current_state(TASK_INTERRUPTIBLE);
605 schedule_timeout(timeout);
606
607 dbg("%s - stopping urbs", __FUNCTION__);
608 usb_kill_urb (port->interrupt_in_urb);
609 usb_kill_urb (port->interrupt_out_urb);
610
611 if (port->tty) {
612 c_cflag = port->tty->termios->c_cflag;
613 if (c_cflag & HUPCL) {
614 /* drop dtr and rts */
615 priv = usb_get_serial_port_data(port);
616 spin_lock_irqsave(&priv->lock, flags);
617 priv->line_control = 0;
618 priv->cmd_ctrl = 1;
619 spin_unlock_irqrestore(&priv->lock, flags);
620 cypress_write(port, NULL, 0);
621 }
622 }
623
624 if (stats)
625 dev_info (&port->dev, "Statistics: %d Bytes In | %d Bytes Out | %d Commands Issued\n",
626 priv->bytes_in, priv->bytes_out, priv->cmd_count);
627 } /* cypress_close */
628
629
630 static int cypress_write(struct usb_serial_port *port, const unsigned char *buf, int count)
631 {
632 struct cypress_private *priv = usb_get_serial_port_data(port);
633 unsigned long flags;
634
635 dbg("%s - port %d, %d bytes", __FUNCTION__, port->number, count);
636
637 /* line control commands, which need to be executed immediately,
638 are not put into the buffer for obvious reasons.
639 */
640 if (priv->cmd_ctrl) {
641 count = 0;
642 goto finish;
643 }
644
645 if (!count)
646 return count;
647
648 spin_lock_irqsave(&priv->lock, flags);
649 count = cypress_buf_put(priv->buf, buf, count);
650 spin_unlock_irqrestore(&priv->lock, flags);
651
652 finish:
653 cypress_send(port);
654
655 return count;
656 } /* cypress_write */
657
658
659 static void cypress_send(struct usb_serial_port *port)
660 {
661 int count = 0, result, offset, actual_size;
662 struct cypress_private *priv = usb_get_serial_port_data(port);
663 unsigned long flags;
664
665 dbg("%s - port %d", __FUNCTION__, port->number);
666 dbg("%s - interrupt out size is %d", __FUNCTION__, port->interrupt_out_size);
667
668 spin_lock_irqsave(&priv->lock, flags);
669 if (priv->write_urb_in_use) {
670 dbg("%s - can't write, urb in use", __FUNCTION__);
671 spin_unlock_irqrestore(&priv->lock, flags);
672 return;
673 }
674 spin_unlock_irqrestore(&priv->lock, flags);
675
676 /* clear buffer */
677 memset(port->interrupt_out_urb->transfer_buffer, 0, port->interrupt_out_size);
678
679 spin_lock_irqsave(&priv->lock, flags);
680 switch (port->interrupt_out_size) {
681 case 32:
682 // this is for the CY7C64013...
683 offset = 2;
684 port->interrupt_out_buffer[0] = priv->line_control;
685 break;
686 case 8:
687 // this is for the CY7C63743...
688 offset = 1;
689 port->interrupt_out_buffer[0] = priv->line_control;
690 break;
691 default:
692 dbg("%s - wrong packet size", __FUNCTION__);
693 spin_unlock_irqrestore(&priv->lock, flags);
694 return;
695 }
696
697 if (priv->line_control & CONTROL_RESET)
698 priv->line_control &= ~CONTROL_RESET;
699
700 if (priv->cmd_ctrl) {
701 priv->cmd_count++;
702 dbg("%s - line control command being issued", __FUNCTION__);
703 spin_unlock_irqrestore(&priv->lock, flags);
704 goto send;
705 } else
706 spin_unlock_irqrestore(&priv->lock, flags);
707
708 count = cypress_buf_get(priv->buf, &port->interrupt_out_buffer[offset],
709 port->interrupt_out_size-offset);
710
711 if (count == 0) {
712 return;
713 }
714
715 switch (port->interrupt_out_size) {
716 case 32:
717 port->interrupt_out_buffer[1] = count;
718 break;
719 case 8:
720 port->interrupt_out_buffer[0] |= count;
721 }
722
723 dbg("%s - count is %d", __FUNCTION__, count);
724
725 send:
726 spin_lock_irqsave(&priv->lock, flags);
727 priv->write_urb_in_use = 1;
728 spin_unlock_irqrestore(&priv->lock, flags);
729
730 if (priv->cmd_ctrl)
731 actual_size = 1;
732 else
733 actual_size = count + (port->interrupt_out_size == 32 ? 2 : 1);
734
735 usb_serial_debug_data(debug, &port->dev, __FUNCTION__, port->interrupt_out_size,
736 port->interrupt_out_urb->transfer_buffer);
737
738 port->interrupt_out_urb->transfer_buffer_length = actual_size;
739 port->interrupt_out_urb->dev = port->serial->dev;
740 result = usb_submit_urb (port->interrupt_out_urb, GFP_ATOMIC);
741 if (result) {
742 dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __FUNCTION__,
743 result);
744 priv->write_urb_in_use = 0;
745 }
746
747 spin_lock_irqsave(&priv->lock, flags);
748 if (priv->cmd_ctrl) {
749 priv->cmd_ctrl = 0;
750 }
751 priv->bytes_out += count; /* do not count the line control and size bytes */
752 spin_unlock_irqrestore(&priv->lock, flags);
753
754 schedule_work(&port->work);
755 } /* cypress_send */
756
757
758 /* returns how much space is available in the soft buffer */
759 static int cypress_write_room(struct usb_serial_port *port)
760 {
761 struct cypress_private *priv = usb_get_serial_port_data(port);
762 int room = 0;
763 unsigned long flags;
764
765 dbg("%s - port %d", __FUNCTION__, port->number);
766
767 spin_lock_irqsave(&priv->lock, flags);
768 room = cypress_buf_space_avail(priv->buf);
769 spin_unlock_irqrestore(&priv->lock, flags);
770
771 dbg("%s - returns %d", __FUNCTION__, room);
772 return room;
773 }
774
775
776 static int cypress_tiocmget (struct usb_serial_port *port, struct file *file)
777 {
778 struct cypress_private *priv = usb_get_serial_port_data(port);
779 __u8 status, control;
780 unsigned int result = 0;
781 unsigned long flags;
782
783 dbg("%s - port %d", __FUNCTION__, port->number);
784
785 spin_lock_irqsave(&priv->lock, flags);
786 control = priv->line_control;
787 status = priv->current_status;
788 spin_unlock_irqrestore(&priv->lock, flags);
789
790 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
791 | ((control & CONTROL_RTS) ? TIOCM_RTS : 0)
792 | ((status & UART_CTS) ? TIOCM_CTS : 0)
793 | ((status & UART_DSR) ? TIOCM_DSR : 0)
794 | ((status & UART_RI) ? TIOCM_RI : 0)
795 | ((status & UART_CD) ? TIOCM_CD : 0);
796
797 dbg("%s - result = %x", __FUNCTION__, result);
798
799 return result;
800 }
801
802
803 static int cypress_tiocmset (struct usb_serial_port *port, struct file *file,
804 unsigned int set, unsigned int clear)
805 {
806 struct cypress_private *priv = usb_get_serial_port_data(port);
807 unsigned long flags;
808
809 dbg("%s - port %d", __FUNCTION__, port->number);
810
811 spin_lock_irqsave(&priv->lock, flags);
812 if (set & TIOCM_RTS)
813 priv->line_control |= CONTROL_RTS;
814 if (set & TIOCM_DTR)
815 priv->line_control |= CONTROL_DTR;
816 if (clear & TIOCM_RTS)
817 priv->line_control &= ~CONTROL_RTS;
818 if (clear & TIOCM_DTR)
819 priv->line_control &= ~CONTROL_DTR;
820 spin_unlock_irqrestore(&priv->lock, flags);
821
822 priv->cmd_ctrl = 1;
823 return cypress_write(port, NULL, 0);
824 }
825
826
827 static int cypress_ioctl (struct usb_serial_port *port, struct file * file, unsigned int cmd, unsigned long arg)
828 {
829 struct cypress_private *priv = usb_get_serial_port_data(port);
830
831 dbg("%s - port %d, cmd 0x%.4x", __FUNCTION__, port->number, cmd);
832
833 switch (cmd) {
834 case TIOCGSERIAL:
835 if (copy_to_user((void __user *)arg, port->tty->termios, sizeof(struct termios))) {
836 return -EFAULT;
837 }
838 return (0);
839 break;
840 case TIOCSSERIAL:
841 if (copy_from_user(port->tty->termios, (void __user *)arg, sizeof(struct termios))) {
842 return -EFAULT;
843 }
844 /* here we need to call cypress_set_termios to invoke the new settings */
845 cypress_set_termios(port, &priv->tmp_termios);
846 return (0);
847 break;
848 /* these are called when setting baud rate from gpsd */
849 case TCGETS:
850 if (copy_to_user((void __user *)arg, port->tty->termios, sizeof(struct termios))) {
851 return -EFAULT;
852 }
853 return (0);
854 break;
855 case TCSETS:
856 if (copy_from_user(port->tty->termios, (void __user *)arg, sizeof(struct termios))) {
857 return -EFAULT;
858 }
859 /* here we need to call cypress_set_termios to invoke the new settings */
860 cypress_set_termios(port, &priv->tmp_termios);
861 return (0);
862 break;
863 /* This code comes from drivers/char/serial.c and ftdi_sio.c */
864 case TIOCMIWAIT:
865 while (priv != NULL) {
866 interruptible_sleep_on(&priv->delta_msr_wait);
867 /* see if a signal did it */
868 if (signal_pending(current))
869 return -ERESTARTSYS;
870 else {
871 char diff = priv->diff_status;
872
873 if (diff == 0) {
874 return -EIO; /* no change => error */
875 }
876
877 /* consume all events */
878 priv->diff_status = 0;
879
880 /* return 0 if caller wanted to know about these bits */
881 if ( ((arg & TIOCM_RNG) && (diff & UART_RI)) ||
882 ((arg & TIOCM_DSR) && (diff & UART_DSR)) ||
883 ((arg & TIOCM_CD) && (diff & UART_CD)) ||
884 ((arg & TIOCM_CTS) && (diff & UART_CTS)) ) {
885 return 0;
886 }
887 /* otherwise caller can't care less about what happened,
888 * and so we continue to wait for more events.
889 */
890 }
891 }
892 return 0;
893 break;
894 default:
895 break;
896 }
897
898 dbg("%s - arg not supported - it was 0x%04x - check include/asm/ioctls.h", __FUNCTION__, cmd);
899
900 return -ENOIOCTLCMD;
901 } /* cypress_ioctl */
902
903
904 static void cypress_set_termios (struct usb_serial_port *port, struct termios *old_termios)
905 {
906 struct cypress_private *priv = usb_get_serial_port_data(port);
907 struct tty_struct *tty;
908 int data_bits, stop_bits, parity_type, parity_enable;
909 unsigned cflag, iflag, baud_mask;
910 unsigned long flags;
911 __u8 oldlines;
912 int linechange;
913
914 dbg("%s - port %d", __FUNCTION__, port->number);
915
916 tty = port->tty;
917 if ((!tty) || (!tty->termios)) {
918 dbg("%s - no tty structures", __FUNCTION__);
919 return;
920 }
921
922 spin_lock_irqsave(&priv->lock, flags);
923 if (!priv->termios_initialized) {
924 if (priv->chiptype == CT_EARTHMATE) {
925 *(tty->termios) = tty_std_termios;
926 tty->termios->c_cflag = B4800 | CS8 | CREAD | HUPCL | CLOCAL;
927 } else if (priv->chiptype == CT_CYPHIDCOM) {
928 *(tty->termios) = tty_std_termios;
929 tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
930 }
931 priv->termios_initialized = 1;
932 }
933 spin_unlock_irqrestore(&priv->lock, flags);
934
935 cflag = tty->termios->c_cflag;
936 iflag = tty->termios->c_iflag;
937
938 /* check if there are new settings */
939 if (old_termios) {
940 if ((cflag != old_termios->c_cflag) ||
941 (RELEVANT_IFLAG(iflag) != RELEVANT_IFLAG(old_termios->c_iflag))) {
942 dbg("%s - attempting to set new termios settings", __FUNCTION__);
943 /* should make a copy of this in case something goes wrong in the function, we can restore it */
944 spin_lock_irqsave(&priv->lock, flags);
945 priv->tmp_termios = *(tty->termios);
946 spin_unlock_irqrestore(&priv->lock, flags);
947 } else {
948 dbg("%s - nothing to do, exiting", __FUNCTION__);
949 return;
950 }
951 } else
952 return;
953
954 /* set number of data bits, parity, stop bits */
955 /* when parity is disabled the parity type bit is ignored */
956
957 stop_bits = cflag & CSTOPB ? 1 : 0; /* 1 means 2 stop bits, 0 means 1 stop bit */
958
959 if (cflag & PARENB) {
960 parity_enable = 1;
961 parity_type = cflag & PARODD ? 1 : 0; /* 1 means odd parity, 0 means even parity */
962 } else
963 parity_enable = parity_type = 0;
964
965 if (cflag & CSIZE) {
966 switch (cflag & CSIZE) {
967 case CS5: data_bits = 0; break;
968 case CS6: data_bits = 1; break;
969 case CS7: data_bits = 2; break;
970 case CS8: data_bits = 3; break;
971 default: err("%s - CSIZE was set, but not CS5-CS8", __FUNCTION__); data_bits = 3;
972 }
973 } else
974 data_bits = 3;
975
976 spin_lock_irqsave(&priv->lock, flags);
977 oldlines = priv->line_control;
978 if ((cflag & CBAUD) == B0) {
979 /* drop dtr and rts */
980 dbg("%s - dropping the lines, baud rate 0bps", __FUNCTION__);
981 baud_mask = B0;
982 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
983 } else {
984 baud_mask = (cflag & CBAUD);
985 switch(baud_mask) {
986 case B300: dbg("%s - setting baud 300bps", __FUNCTION__); break;
987 case B600: dbg("%s - setting baud 600bps", __FUNCTION__); break;
988 case B1200: dbg("%s - setting baud 1200bps", __FUNCTION__); break;
989 case B2400: dbg("%s - setting baud 2400bps", __FUNCTION__); break;
990 case B4800: dbg("%s - setting baud 4800bps", __FUNCTION__); break;
991 case B9600: dbg("%s - setting baud 9600bps", __FUNCTION__); break;
992 case B19200: dbg("%s - setting baud 19200bps", __FUNCTION__); break;
993 case B38400: dbg("%s - setting baud 38400bps", __FUNCTION__); break;
994 case B57600: dbg("%s - setting baud 57600bps", __FUNCTION__); break;
995 case B115200: dbg("%s - setting baud 115200bps", __FUNCTION__); break;
996 default: dbg("%s - unknown masked baud rate", __FUNCTION__);
997 }
998 priv->line_control |= CONTROL_DTR;
999
1000 /* toggle CRTSCTS? - don't do this if being called from cypress_open */
1001 if (!priv->calledfromopen) {
1002 if (cflag & CRTSCTS)
1003 priv->line_control |= CONTROL_RTS;
1004 else
1005 priv->line_control &= ~CONTROL_RTS;
1006 }
1007 }
1008 spin_unlock_irqrestore(&priv->lock, flags);
1009
1010 dbg("%s - sending %d stop_bits, %d parity_enable, %d parity_type, %d data_bits (+5)", __FUNCTION__,
1011 stop_bits, parity_enable, parity_type, data_bits);
1012
1013 cypress_serial_control(port, baud_mask, data_bits, stop_bits, parity_enable,
1014 parity_type, 0, CYPRESS_SET_CONFIG);
1015
1016 set_current_state(TASK_INTERRUPTIBLE);
1017 schedule_timeout(50*HZ/1000); /* give some time between change and read (50ms) */
1018
1019 /* we perform a CYPRESS_GET_CONFIG so that the current settings are filled into the private structure
1020 * this should confirm that all is working if it returns what we just set */
1021 cypress_serial_control(port, 0, 0, 0, 0, 0, 0, CYPRESS_GET_CONFIG);
1022
1023 /* Here we can define custom tty settings for devices
1024 *
1025 * the main tty termios flag base comes from empeg.c
1026 */
1027
1028 spin_lock_irqsave(&priv->lock, flags);
1029 if ( (priv->chiptype == CT_EARTHMATE) && (priv->baud_rate == 4800) ) {
1030
1031 dbg("Using custom termios settings for a baud rate of 4800bps.");
1032 /* define custom termios settings for NMEA protocol */
1033
1034
1035 tty->termios->c_iflag /* input modes - */
1036 &= ~(IGNBRK /* disable ignore break */
1037 | BRKINT /* disable break causes interrupt */
1038 | PARMRK /* disable mark parity errors */
1039 | ISTRIP /* disable clear high bit of input characters */
1040 | INLCR /* disable translate NL to CR */
1041 | IGNCR /* disable ignore CR */
1042 | ICRNL /* disable translate CR to NL */
1043 | IXON); /* disable enable XON/XOFF flow control */
1044
1045 tty->termios->c_oflag /* output modes */
1046 &= ~OPOST; /* disable postprocess output characters */
1047
1048 tty->termios->c_lflag /* line discipline modes */
1049 &= ~(ECHO /* disable echo input characters */
1050 | ECHONL /* disable echo new line */
1051 | ICANON /* disable erase, kill, werase, and rprnt special characters */
1052 | ISIG /* disable interrupt, quit, and suspend special characters */
1053 | IEXTEN); /* disable non-POSIX special characters */
1054
1055 } else if (priv->chiptype == CT_CYPHIDCOM) {
1056
1057 // Software app handling it for device...
1058
1059 }
1060 linechange = (priv->line_control != oldlines);
1061 spin_unlock_irqrestore(&priv->lock, flags);
1062
1063 /* if necessary, set lines */
1064 if (!priv->calledfromopen && linechange) {
1065 priv->cmd_ctrl = 1;
1066 cypress_write(port, NULL, 0);
1067 }
1068
1069 if (priv->calledfromopen)
1070 priv->calledfromopen = 0;
1071
1072 } /* cypress_set_termios */
1073
1074
1075 /* returns amount of data still left in soft buffer */
1076 static int cypress_chars_in_buffer(struct usb_serial_port *port)
1077 {
1078 struct cypress_private *priv = usb_get_serial_port_data(port);
1079 int chars = 0;
1080 unsigned long flags;
1081
1082 dbg("%s - port %d", __FUNCTION__, port->number);
1083
1084 spin_lock_irqsave(&priv->lock, flags);
1085 chars = cypress_buf_data_avail(priv->buf);
1086 spin_unlock_irqrestore(&priv->lock, flags);
1087
1088 dbg("%s - returns %d", __FUNCTION__, chars);
1089 return chars;
1090 }
1091
1092
1093 static void cypress_throttle (struct usb_serial_port *port)
1094 {
1095 struct cypress_private *priv = usb_get_serial_port_data(port);
1096 unsigned long flags;
1097
1098 dbg("%s - port %d", __FUNCTION__, port->number);
1099
1100 spin_lock_irqsave(&priv->lock, flags);
1101 priv->rx_flags = THROTTLED;
1102 spin_unlock_irqrestore(&priv->lock, flags);
1103 }
1104
1105
1106 static void cypress_unthrottle (struct usb_serial_port *port)
1107 {
1108 struct cypress_private *priv = usb_get_serial_port_data(port);
1109 int actually_throttled, result;
1110 unsigned long flags;
1111
1112 dbg("%s - port %d", __FUNCTION__, port->number);
1113
1114 spin_lock_irqsave(&priv->lock, flags);
1115 actually_throttled = priv->rx_flags & ACTUALLY_THROTTLED;
1116 priv->rx_flags = 0;
1117 spin_unlock_irqrestore(&priv->lock, flags);
1118
1119 if (actually_throttled) {
1120 port->interrupt_in_urb->dev = port->serial->dev;
1121
1122 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
1123 if (result)
1124 dev_err(&port->dev, "%s - failed submitting read urb, error %d\n", __FUNCTION__, result);
1125 }
1126 }
1127
1128
1129 static void cypress_read_int_callback(struct urb *urb, struct pt_regs *regs)
1130 {
1131 struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
1132 struct cypress_private *priv = usb_get_serial_port_data(port);
1133 struct tty_struct *tty;
1134 unsigned char *data = urb->transfer_buffer;
1135 unsigned long flags;
1136 char tty_flag = TTY_NORMAL;
1137 int havedata = 0;
1138 int bytes = 0;
1139 int result;
1140 int i = 0;
1141
1142 dbg("%s - port %d", __FUNCTION__, port->number);
1143
1144 if (urb->status) {
1145 dbg("%s - nonzero read status received: %d", __FUNCTION__, urb->status);
1146 return;
1147 }
1148
1149 spin_lock_irqsave(&priv->lock, flags);
1150 if (priv->rx_flags & THROTTLED) {
1151 dbg("%s - now throttling", __FUNCTION__);
1152 priv->rx_flags |= ACTUALLY_THROTTLED;
1153 spin_unlock_irqrestore(&priv->lock, flags);
1154 return;
1155 }
1156 spin_unlock_irqrestore(&priv->lock, flags);
1157
1158 tty = port->tty;
1159 if (!tty) {
1160 dbg("%s - bad tty pointer - exiting", __FUNCTION__);
1161 return;
1162 }
1163
1164 spin_lock_irqsave(&priv->lock, flags);
1165 switch(urb->actual_length) {
1166 case 32:
1167 // This is for the CY7C64013...
1168 priv->current_status = data[0] & 0xF8;
1169 bytes = data[1]+2;
1170 i=2;
1171 if (bytes > 2)
1172 havedata = 1;
1173 break;
1174 case 8:
1175 // This is for the CY7C63743...
1176 priv->current_status = data[0] & 0xF8;
1177 bytes = (data[0] & 0x07)+1;
1178 i=1;
1179 if (bytes > 1)
1180 havedata = 1;
1181 break;
1182 default:
1183 dbg("%s - wrong packet size - received %d bytes", __FUNCTION__, urb->actual_length);
1184 spin_unlock_irqrestore(&priv->lock, flags);
1185 goto continue_read;
1186 }
1187 spin_unlock_irqrestore(&priv->lock, flags);
1188
1189 usb_serial_debug_data (debug, &port->dev, __FUNCTION__, urb->actual_length, data);
1190
1191 spin_lock_irqsave(&priv->lock, flags);
1192 /* check to see if status has changed */
1193 if (priv != NULL) {
1194 if (priv->current_status != priv->prev_status) {
1195 priv->diff_status |= priv->current_status ^ priv->prev_status;
1196 wake_up_interruptible(&priv->delta_msr_wait);
1197 priv->prev_status = priv->current_status;
1198 }
1199 }
1200 spin_unlock_irqrestore(&priv->lock, flags);
1201
1202 /* hangup, as defined in acm.c... this might be a bad place for it though */
1203 if (tty && !(tty->termios->c_cflag & CLOCAL) && !(priv->current_status & UART_CD)) {
1204 dbg("%s - calling hangup", __FUNCTION__);
1205 tty_hangup(tty);
1206 goto continue_read;
1207 }
1208
1209 /* There is one error bit... I'm assuming it is a parity error indicator
1210 * as the generic firmware will set this bit to 1 if a parity error occurs.
1211 * I can not find reference to any other error events.
1212 *
1213 */
1214 spin_lock_irqsave(&priv->lock, flags);
1215 if (priv->current_status & CYP_ERROR) {
1216 spin_unlock_irqrestore(&priv->lock, flags);
1217 tty_flag = TTY_PARITY;
1218 dbg("%s - Parity Error detected", __FUNCTION__);
1219 } else
1220 spin_unlock_irqrestore(&priv->lock, flags);
1221
1222 /* process read if there is data other than line status */
1223 if (tty && (bytes > i)) {
1224 for (; i < bytes ; ++i) {
1225 dbg("pushing byte number %d - %d - %c",i,data[i],data[i]);
1226 if(tty->flip.count >= TTY_FLIPBUF_SIZE) {
1227 tty_flip_buffer_push(tty);
1228 }
1229 tty_insert_flip_char(tty, data[i], tty_flag);
1230 }
1231 tty_flip_buffer_push(port->tty);
1232 }
1233
1234 spin_lock_irqsave(&priv->lock, flags);
1235 priv->bytes_in += bytes; /* control and status byte(s) are also counted */
1236 spin_unlock_irqrestore(&priv->lock, flags);
1237
1238 continue_read:
1239
1240 /* Continue trying to always read... unless the port has closed. */
1241
1242 if (port->open_count > 0) {
1243 usb_fill_int_urb(port->interrupt_in_urb, port->serial->dev,
1244 usb_rcvintpipe(port->serial->dev, port->interrupt_in_endpointAddress),
1245 port->interrupt_in_urb->transfer_buffer,
1246 port->interrupt_in_urb->transfer_buffer_length,
1247 cypress_read_int_callback, port,
1248 port->interrupt_in_urb->interval);
1249 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
1250 if (result)
1251 dev_err(&urb->dev->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result);
1252 }
1253
1254 return;
1255 } /* cypress_read_int_callback */
1256
1257
1258 static void cypress_write_int_callback(struct urb *urb, struct pt_regs *regs)
1259 {
1260 struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
1261 struct cypress_private *priv = usb_get_serial_port_data(port);
1262 int result;
1263
1264 dbg("%s - port %d", __FUNCTION__, port->number);
1265
1266 switch (urb->status) {
1267 case 0:
1268 /* success */
1269 break;
1270 case -ECONNRESET:
1271 case -ENOENT:
1272 case -ESHUTDOWN:
1273 /* this urb is terminated, clean up */
1274 dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
1275 priv->write_urb_in_use = 0;
1276 return;
1277 default:
1278 /* error in the urb, so we have to resubmit it */
1279 dbg("%s - Overflow in write", __FUNCTION__);
1280 dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->status);
1281 port->interrupt_out_urb->transfer_buffer_length = 1;
1282 port->interrupt_out_urb->dev = port->serial->dev;
1283 result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC);
1284 if (result)
1285 dev_err(&urb->dev->dev, "%s - failed resubmitting write urb, error %d\n",
1286 __FUNCTION__, result);
1287 else
1288 return;
1289 }
1290
1291 priv->write_urb_in_use = 0;
1292
1293 /* send any buffered data */
1294 cypress_send(port);
1295 }
1296
1297
1298 /*****************************************************************************
1299 * Write buffer functions - buffering code from pl2303 used
1300 *****************************************************************************/
1301
1302 /*
1303 * cypress_buf_alloc
1304 *
1305 * Allocate a circular buffer and all associated memory.
1306 */
1307
1308 static struct cypress_buf *cypress_buf_alloc(unsigned int size)
1309 {
1310
1311 struct cypress_buf *cb;
1312
1313
1314 if (size == 0)
1315 return NULL;
1316
1317 cb = (struct cypress_buf *)kmalloc(sizeof(struct cypress_buf), GFP_KERNEL);
1318 if (cb == NULL)
1319 return NULL;
1320
1321 cb->buf_buf = kmalloc(size, GFP_KERNEL);
1322 if (cb->buf_buf == NULL) {
1323 kfree(cb);
1324 return NULL;
1325 }
1326
1327 cb->buf_size = size;
1328 cb->buf_get = cb->buf_put = cb->buf_buf;
1329
1330 return cb;
1331
1332 }
1333
1334
1335 /*
1336 * cypress_buf_free
1337 *
1338 * Free the buffer and all associated memory.
1339 */
1340
1341 static void cypress_buf_free(struct cypress_buf *cb)
1342 {
1343 if (cb != NULL) {
1344 if (cb->buf_buf != NULL)
1345 kfree(cb->buf_buf);
1346 kfree(cb);
1347 }
1348 }
1349
1350
1351 /*
1352 * cypress_buf_clear
1353 *
1354 * Clear out all data in the circular buffer.
1355 */
1356
1357 static void cypress_buf_clear(struct cypress_buf *cb)
1358 {
1359 if (cb != NULL)
1360 cb->buf_get = cb->buf_put;
1361 /* equivalent to a get of all data available */
1362 }
1363
1364
1365 /*
1366 * cypress_buf_data_avail
1367 *
1368 * Return the number of bytes of data available in the circular
1369 * buffer.
1370 */
1371
1372 static unsigned int cypress_buf_data_avail(struct cypress_buf *cb)
1373 {
1374 if (cb != NULL)
1375 return ((cb->buf_size + cb->buf_put - cb->buf_get) % cb->buf_size);
1376 else
1377 return 0;
1378 }
1379
1380
1381 /*
1382 * cypress_buf_space_avail
1383 *
1384 * Return the number of bytes of space available in the circular
1385 * buffer.
1386 */
1387
1388 static unsigned int cypress_buf_space_avail(struct cypress_buf *cb)
1389 {
1390 if (cb != NULL)
1391 return ((cb->buf_size + cb->buf_get - cb->buf_put - 1) % cb->buf_size);
1392 else
1393 return 0;
1394 }
1395
1396
1397 /*
1398 * cypress_buf_put
1399 *
1400 * Copy data data from a user buffer and put it into the circular buffer.
1401 * Restrict to the amount of space available.
1402 *
1403 * Return the number of bytes copied.
1404 */
1405
1406 static unsigned int cypress_buf_put(struct cypress_buf *cb, const char *buf,
1407 unsigned int count)
1408 {
1409
1410 unsigned int len;
1411
1412
1413 if (cb == NULL)
1414 return 0;
1415
1416 len = cypress_buf_space_avail(cb);
1417 if (count > len)
1418 count = len;
1419
1420 if (count == 0)
1421 return 0;
1422
1423 len = cb->buf_buf + cb->buf_size - cb->buf_put;
1424 if (count > len) {
1425 memcpy(cb->buf_put, buf, len);
1426 memcpy(cb->buf_buf, buf+len, count - len);
1427 cb->buf_put = cb->buf_buf + count - len;
1428 } else {
1429 memcpy(cb->buf_put, buf, count);
1430 if (count < len)
1431 cb->buf_put += count;
1432 else /* count == len */
1433 cb->buf_put = cb->buf_buf;
1434 }
1435
1436 return count;
1437
1438 }
1439
1440
1441 /*
1442 * cypress_buf_get
1443 *
1444 * Get data from the circular buffer and copy to the given buffer.
1445 * Restrict to the amount of data available.
1446 *
1447 * Return the number of bytes copied.
1448 */
1449
1450 static unsigned int cypress_buf_get(struct cypress_buf *cb, char *buf,
1451 unsigned int count)
1452 {
1453
1454 unsigned int len;
1455
1456
1457 if (cb == NULL)
1458 return 0;
1459
1460 len = cypress_buf_data_avail(cb);
1461 if (count > len)
1462 count = len;
1463
1464 if (count == 0)
1465 return 0;
1466
1467 len = cb->buf_buf + cb->buf_size - cb->buf_get;
1468 if (count > len) {
1469 memcpy(buf, cb->buf_get, len);
1470 memcpy(buf+len, cb->buf_buf, count - len);
1471 cb->buf_get = cb->buf_buf + count - len;
1472 } else {
1473 memcpy(buf, cb->buf_get, count);
1474 if (count < len)
1475 cb->buf_get += count;
1476 else /* count == len */
1477 cb->buf_get = cb->buf_buf;
1478 }
1479
1480 return count;
1481
1482 }
1483
1484 /*****************************************************************************
1485 * Module functions
1486 *****************************************************************************/
1487
1488 static int __init cypress_init(void)
1489 {
1490 int retval;
1491
1492 dbg("%s", __FUNCTION__);
1493
1494 retval = usb_serial_register(&cypress_earthmate_device);
1495 if (retval)
1496 goto failed_em_register;
1497 retval = usb_serial_register(&cypress_hidcom_device);
1498 if (retval)
1499 goto failed_hidcom_register;
1500 retval = usb_register(&cypress_driver);
1501 if (retval)
1502 goto failed_usb_register;
1503
1504 info(DRIVER_DESC " " DRIVER_VERSION);
1505 return 0;
1506 failed_usb_register:
1507 usb_deregister(&cypress_driver);
1508 failed_hidcom_register:
1509 usb_serial_deregister(&cypress_hidcom_device);
1510 failed_em_register:
1511 usb_serial_deregister(&cypress_earthmate_device);
1512
1513 return retval;
1514 }
1515
1516
1517 static void __exit cypress_exit (void)
1518 {
1519 dbg("%s", __FUNCTION__);
1520
1521 usb_deregister (&cypress_driver);
1522 usb_serial_deregister (&cypress_earthmate_device);
1523 usb_serial_deregister (&cypress_hidcom_device);
1524 }
1525
1526
1527 module_init(cypress_init);
1528 module_exit(cypress_exit);
1529
1530 MODULE_AUTHOR( DRIVER_AUTHOR );
1531 MODULE_DESCRIPTION( DRIVER_DESC );
1532 MODULE_VERSION( DRIVER_VERSION );
1533 MODULE_LICENSE("GPL");
1534
1535 module_param(debug, bool, S_IRUGO | S_IWUSR);
1536 MODULE_PARM_DESC(debug, "Debug enabled or not");
1537 module_param(stats, bool, S_IRUGO | S_IWUSR);
1538 MODULE_PARM_DESC(stats, "Enable statistics or not");
1539
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