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[XFRM]: skb_cow_data() does not set proper owner for new skbs.
[linux-2.6/verdex.git] / drivers / usb / serial / cypress_m8.c
blob012e63e05806076b06a42dc1d3d592fa45fc0fce
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/config.h>
52 #include <linux/kernel.h>
53 #include <linux/errno.h>
54 #include <linux/init.h>
55 #include <linux/slab.h>
56 #include <linux/tty.h>
57 #include <linux/tty_driver.h>
58 #include <linux/tty_flip.h>
59 #include <linux/module.h>
60 #include <linux/moduleparam.h>
61 #include <linux/spinlock.h>
62 #include <linux/usb.h>
63 #include <linux/serial.h>
64 #include <linux/delay.h>
65 #include <asm/uaccess.h>
66
67 #include "usb-serial.h"
68 #include "cypress_m8.h"
69
70
71 #ifdef CONFIG_USB_SERIAL_DEBUG
72 static int debug = 1;
73 #else
74 static int debug;
75 #endif
76 static int stats;
77 static int interval;
78
79 /*
80 * Version Information
81 */
82 #define DRIVER_VERSION "v1.09"
83 #define DRIVER_AUTHOR "Lonnie Mendez <dignome@gmail.com>, Neil Whelchel <koyama@firstlight.net>"
84 #define DRIVER_DESC "Cypress USB to Serial Driver"
85
86 /* write buffer size defines */
87 #define CYPRESS_BUF_SIZE 1024
88 #define CYPRESS_CLOSING_WAIT (30*HZ)
89
90 static struct usb_device_id id_table_earthmate [] = {
91 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
92 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
93 { } /* Terminating entry */
94 };
95
96 static struct usb_device_id id_table_cyphidcomrs232 [] = {
97 { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
98 { } /* Terminating entry */
99 };
100
101 static struct usb_device_id id_table_combined [] = {
102 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
103 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
104 { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
105 { } /* Terminating entry */
106 };
107
108 MODULE_DEVICE_TABLE (usb, id_table_combined);
109
110 static struct usb_driver cypress_driver = {
111 .name = "cypress",
112 .probe = usb_serial_probe,
113 .disconnect = usb_serial_disconnect,
114 .id_table = id_table_combined,
115 };
116
117 struct cypress_private {
118 spinlock_t lock; /* private lock */
119 int chiptype; /* identifier of device, for quirks/etc */
120 int bytes_in; /* used for statistics */
121 int bytes_out; /* used for statistics */
122 int cmd_count; /* used for statistics */
123 int cmd_ctrl; /* always set this to 1 before issuing a command */
124 struct cypress_buf *buf; /* write buffer */
125 int write_urb_in_use; /* write urb in use indicator */
126 int termios_initialized;
127 __u8 line_control; /* holds dtr / rts value */
128 __u8 current_status; /* received from last read - info on dsr,cts,cd,ri,etc */
129 __u8 current_config; /* stores the current configuration byte */
130 __u8 rx_flags; /* throttling - used from whiteheat/ftdi_sio */
131 int baud_rate; /* stores current baud rate in integer form */
132 int cbr_mask; /* stores current baud rate in masked form */
133 int isthrottled; /* if throttled, discard reads */
134 wait_queue_head_t delta_msr_wait; /* used for TIOCMIWAIT */
135 char prev_status, diff_status; /* used for TIOCMIWAIT */
136 /* we pass a pointer to this as the arguement sent to cypress_set_termios old_termios */
137 struct termios tmp_termios; /* stores the old termios settings */
138 };
139
140 /* write buffer structure */
141 struct cypress_buf {
142 unsigned int buf_size;
143 char *buf_buf;
144 char *buf_get;
145 char *buf_put;
146 };
147
148 /* function prototypes for the Cypress USB to serial device */
149 static int cypress_earthmate_startup (struct usb_serial *serial);
150 static int cypress_hidcom_startup (struct usb_serial *serial);
151 static void cypress_shutdown (struct usb_serial *serial);
152 static int cypress_open (struct usb_serial_port *port, struct file *filp);
153 static void cypress_close (struct usb_serial_port *port, struct file *filp);
154 static int cypress_write (struct usb_serial_port *port, const unsigned char *buf, int count);
155 static void cypress_send (struct usb_serial_port *port);
156 static int cypress_write_room (struct usb_serial_port *port);
157 static int cypress_ioctl (struct usb_serial_port *port, struct file * file, unsigned int cmd, unsigned long arg);
158 static void cypress_set_termios (struct usb_serial_port *port, struct termios * old);
159 static int cypress_tiocmget (struct usb_serial_port *port, struct file *file);
160 static int cypress_tiocmset (struct usb_serial_port *port, struct file *file, unsigned int set, unsigned int clear);
161 static int cypress_chars_in_buffer (struct usb_serial_port *port);
162 static void cypress_throttle (struct usb_serial_port *port);
163 static void cypress_unthrottle (struct usb_serial_port *port);
164 static void cypress_read_int_callback (struct urb *urb, struct pt_regs *regs);
165 static void cypress_write_int_callback (struct urb *urb, struct pt_regs *regs);
166 /* baud helper functions */
167 static int mask_to_rate (unsigned mask);
168 static unsigned rate_to_mask (int rate);
169 /* write buffer functions */
170 static struct cypress_buf *cypress_buf_alloc(unsigned int size);
171 static void cypress_buf_free(struct cypress_buf *cb);
172 static void cypress_buf_clear(struct cypress_buf *cb);
173 static unsigned int cypress_buf_data_avail(struct cypress_buf *cb);
174 static unsigned int cypress_buf_space_avail(struct cypress_buf *cb);
175 static unsigned int cypress_buf_put(struct cypress_buf *cb, const char *buf, unsigned int count);
176 static unsigned int cypress_buf_get(struct cypress_buf *cb, char *buf, unsigned int count);
177
178
179 static struct usb_serial_device_type cypress_earthmate_device = {
180 .owner = THIS_MODULE,
181 .name = "DeLorme Earthmate USB",
182 .short_name = "earthmate",
183 .id_table = id_table_earthmate,
184 .num_interrupt_in = 1,
185 .num_interrupt_out = 1,
186 .num_bulk_in = NUM_DONT_CARE,
187 .num_bulk_out = NUM_DONT_CARE,
188 .num_ports = 1,
189 .attach = cypress_earthmate_startup,
190 .shutdown = cypress_shutdown,
191 .open = cypress_open,
192 .close = cypress_close,
193 .write = cypress_write,
194 .write_room = cypress_write_room,
195 .ioctl = cypress_ioctl,
196 .set_termios = cypress_set_termios,
197 .tiocmget = cypress_tiocmget,
198 .tiocmset = cypress_tiocmset,
199 .chars_in_buffer = cypress_chars_in_buffer,
200 .throttle = cypress_throttle,
201 .unthrottle = cypress_unthrottle,
202 .read_int_callback = cypress_read_int_callback,
203 .write_int_callback = cypress_write_int_callback,
204 };
205
206 static struct usb_serial_device_type cypress_hidcom_device = {
207 .owner = THIS_MODULE,
208 .name = "HID->COM RS232 Adapter",
209 .short_name = "cyphidcom",
210 .id_table = id_table_cyphidcomrs232,
211 .num_interrupt_in = 1,
212 .num_interrupt_out = 1,
213 .num_bulk_in = NUM_DONT_CARE,
214 .num_bulk_out = NUM_DONT_CARE,
215 .num_ports = 1,
216 .attach = cypress_hidcom_startup,
217 .shutdown = cypress_shutdown,
218 .open = cypress_open,
219 .close = cypress_close,
220 .write = cypress_write,
221 .write_room = cypress_write_room,
222 .ioctl = cypress_ioctl,
223 .set_termios = cypress_set_termios,
224 .tiocmget = cypress_tiocmget,
225 .tiocmset = cypress_tiocmset,
226 .chars_in_buffer = cypress_chars_in_buffer,
227 .throttle = cypress_throttle,
228 .unthrottle = cypress_unthrottle,
229 .read_int_callback = cypress_read_int_callback,
230 .write_int_callback = cypress_write_int_callback,
231 };
232
233
234 /*****************************************************************************
235 * Cypress serial helper functions
236 *****************************************************************************/
237
238
239 /* This function can either set or retrieve the current serial line settings */
240 static int cypress_serial_control (struct usb_serial_port *port, unsigned baud_mask, int data_bits, int stop_bits,
241 int parity_enable, int parity_type, int reset, int cypress_request_type)
242 {
243 int new_baudrate = 0, retval = 0, tries = 0;
244 struct cypress_private *priv;
245 __u8 feature_buffer[8];
246 unsigned long flags;
247
248 dbg("%s", __FUNCTION__);
249
250 priv = usb_get_serial_port_data(port);
251
252 switch(cypress_request_type) {
253 case CYPRESS_SET_CONFIG:
254
255 /*
256 * The general purpose firmware for the Cypress M8 allows for a maximum speed
257 * of 57600bps (I have no idea whether DeLorme chose to use the general purpose
258 * firmware or not), if you need to modify this speed setting for your own
259 * project please add your own chiptype and modify the code likewise. The
260 * Cypress HID->COM device will work successfully up to 115200bps (but the
261 * actual throughput is around 3kBps).
262 */
263 if (baud_mask != priv->cbr_mask) {
264 dbg("%s - baud rate is changing", __FUNCTION__);
265 if ( priv->chiptype == CT_EARTHMATE ) {
266 /* 300 and 600 baud rates are supported under the generic firmware,
267 * but are not used with NMEA and SiRF protocols */
268
269 if ( (baud_mask == B300) || (baud_mask == B600) ) {
270 err("%s - failed setting baud rate, unsupported speed",
271 __FUNCTION__);
272 new_baudrate = priv->baud_rate;
273 } else if ( (new_baudrate = mask_to_rate(baud_mask)) == -1) {
274 err("%s - failed setting baud rate, unsupported speed",
275 __FUNCTION__);
276 new_baudrate = priv->baud_rate;
277 }
278 } else if (priv->chiptype == CT_CYPHIDCOM) {
279 if ( (new_baudrate = mask_to_rate(baud_mask)) == -1) {
280 err("%s - failed setting baud rate, unsupported speed",
281 __FUNCTION__);
282 new_baudrate = priv->baud_rate;
283 }
284 } else if (priv->chiptype == CT_GENERIC) {
285 if ( (new_baudrate = mask_to_rate(baud_mask)) == -1) {
286 err("%s - failed setting baud rate, unsupported speed",
287 __FUNCTION__);
288 new_baudrate = priv->baud_rate;
289 }
290 } else {
291 info("%s - please define your chiptype", __FUNCTION__);
292 new_baudrate = priv->baud_rate;
293 }
294 } else { /* baud rate not changing, keep the old */
295 new_baudrate = priv->baud_rate;
296 }
297 dbg("%s - baud rate is being sent as %d", __FUNCTION__, new_baudrate);
298
299 memset(feature_buffer, 0, 8);
300 /* fill the feature_buffer with new configuration */
301 *((u_int32_t *)feature_buffer) = new_baudrate;
302
303 feature_buffer[4] |= data_bits; /* assign data bits in 2 bit space ( max 3 ) */
304 /* 1 bit gap */
305 feature_buffer[4] |= (stop_bits << 3); /* assign stop bits in 1 bit space */
306 feature_buffer[4] |= (parity_enable << 4); /* assign parity flag in 1 bit space */
307 feature_buffer[4] |= (parity_type << 5); /* assign parity type in 1 bit space */
308 /* 1 bit gap */
309 feature_buffer[4] |= (reset << 7); /* assign reset at end of byte, 1 bit space */
310
311 dbg("%s - device is being sent this feature report:", __FUNCTION__);
312 dbg("%s - %02X - %02X - %02X - %02X - %02X", __FUNCTION__, feature_buffer[0], feature_buffer[1],
313 feature_buffer[2], feature_buffer[3], feature_buffer[4]);
314
315 do {
316 retval = usb_control_msg (port->serial->dev, usb_sndctrlpipe(port->serial->dev, 0),
317 HID_REQ_SET_REPORT, USB_DIR_OUT | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
318 0x0300, 0, feature_buffer, 8, 500);
319
320 if (tries++ >= 3)
321 break;
322
323 if (retval == EPIPE)
324 usb_clear_halt(port->serial->dev, 0x00);
325 } while (retval != 8 && retval != ENODEV);
326
327 if (retval != 8)
328 err("%s - failed sending serial line settings - %d", __FUNCTION__, retval);
329 else {
330 spin_lock_irqsave(&priv->lock, flags);
331 priv->baud_rate = new_baudrate;
332 priv->cbr_mask = baud_mask;
333 priv->current_config = feature_buffer[4];
334 spin_unlock_irqrestore(&priv->lock, flags);
335 }
336 break;
337 case CYPRESS_GET_CONFIG:
338 dbg("%s - retreiving serial line settings", __FUNCTION__);
339 /* set initial values in feature buffer */
340 memset(feature_buffer, 0, 8);
341
342 do {
343 retval = usb_control_msg (port->serial->dev, usb_rcvctrlpipe(port->serial->dev, 0),
344 HID_REQ_GET_REPORT, USB_DIR_IN | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
345 0x0300, 0, feature_buffer, 8, 500);
346
347 if (tries++ >= 3)
348 break;
349
350 if (retval == EPIPE)
351 usb_clear_halt(port->serial->dev, 0x00);
352 } while (retval != 5 && retval != ENODEV);
353
354 if (retval != 5) {
355 err("%s - failed to retreive serial line settings - %d", __FUNCTION__, retval);
356 return retval;
357 } else {
358 spin_lock_irqsave(&priv->lock, flags);
359
360 /* store the config in one byte, and later use bit masks to check values */
361 priv->current_config = feature_buffer[4];
362 priv->baud_rate = *((u_int32_t *)feature_buffer);
363
364 if ( (priv->cbr_mask = rate_to_mask(priv->baud_rate)) == 0x40)
365 dbg("%s - failed setting the baud mask (not defined)", __FUNCTION__);
366 spin_unlock_irqrestore(&priv->lock, flags);
367 }
368 }
369 spin_lock_irqsave(&priv->lock, flags);
370 ++priv->cmd_count;
371 spin_unlock_irqrestore(&priv->lock, flags);
372
373 return retval;
374 } /* cypress_serial_control */
375
376
377 /* given a baud mask, it will return integer baud on success */
378 static int mask_to_rate (unsigned mask)
379 {
380 int rate;
381
382 switch (mask) {
383 case B0: rate = 0; break;
384 case B300: rate = 300; break;
385 case B600: rate = 600; break;
386 case B1200: rate = 1200; break;
387 case B2400: rate = 2400; break;
388 case B4800: rate = 4800; break;
389 case B9600: rate = 9600; break;
390 case B19200: rate = 19200; break;
391 case B38400: rate = 38400; break;
392 case B57600: rate = 57600; break;
393 case B115200: rate = 115200; break;
394 default: rate = -1;
395 }
396
397 return rate;
398 }
399
400
401 static unsigned rate_to_mask (int rate)
402 {
403 unsigned mask;
404
405 switch (rate) {
406 case 0: mask = B0; break;
407 case 300: mask = B300; break;
408 case 600: mask = B600; break;
409 case 1200: mask = B1200; break;
410 case 2400: mask = B2400; break;
411 case 4800: mask = B4800; break;
412 case 9600: mask = B9600; break;
413 case 19200: mask = B19200; break;
414 case 38400: mask = B38400; break;
415 case 57600: mask = B57600; break;
416 case 115200: mask = B115200; break;
417 default: mask = 0x40;
418 }
419
420 return mask;
421 }
422 /*****************************************************************************
423 * Cypress serial driver functions
424 *****************************************************************************/
425
426
427 static int generic_startup (struct usb_serial *serial)
428 {
429 struct cypress_private *priv;
430
431 dbg("%s - port %d", __FUNCTION__, serial->port[0]->number);
432
433 priv = kmalloc(sizeof (struct cypress_private), GFP_KERNEL);
434 if (!priv)
435 return -ENOMEM;
436
437 memset(priv, 0x00, sizeof (struct cypress_private));
438 spin_lock_init(&priv->lock);
439 priv->buf = cypress_buf_alloc(CYPRESS_BUF_SIZE);
440 if (priv->buf == NULL) {
441 kfree(priv);
442 return -ENOMEM;
443 }
444 init_waitqueue_head(&priv->delta_msr_wait);
445
446 usb_reset_configuration (serial->dev);
447
448 interval = 1;
449 priv->cmd_ctrl = 0;
450 priv->line_control = 0;
451 priv->termios_initialized = 0;
452 priv->rx_flags = 0;
453 priv->cbr_mask = B300;
454 usb_set_serial_port_data(serial->port[0], priv);
455
456 return (0);
457 }
458
459
460 static int cypress_earthmate_startup (struct usb_serial *serial)
461 {
462 struct cypress_private *priv;
463
464 dbg("%s", __FUNCTION__);
465
466 if (generic_startup(serial)) {
467 dbg("%s - Failed setting up port %d", __FUNCTION__, serial->port[0]->number);
468 return 1;
469 }
470
471 priv = usb_get_serial_port_data(serial->port[0]);
472 priv->chiptype = CT_EARTHMATE;
473
474 return (0);
475 } /* cypress_earthmate_startup */
476
477
478 static int cypress_hidcom_startup (struct usb_serial *serial)
479 {
480 struct cypress_private *priv;
481
482 dbg("%s", __FUNCTION__);
483
484 if (generic_startup(serial)) {
485 dbg("%s - Failed setting up port %d", __FUNCTION__, serial->port[0]->number);
486 return 1;
487 }
488
489 priv = usb_get_serial_port_data(serial->port[0]);
490 priv->chiptype = CT_CYPHIDCOM;
491
492 return (0);
493 } /* cypress_hidcom_startup */
494
495
496 static void cypress_shutdown (struct usb_serial *serial)
497 {
498 struct cypress_private *priv;
499
500 dbg ("%s - port %d", __FUNCTION__, serial->port[0]->number);
501
502 /* all open ports are closed at this point */
503
504 priv = usb_get_serial_port_data(serial->port[0]);
505
506 if (priv) {
507 cypress_buf_free(priv->buf);
508 kfree(priv);
509 usb_set_serial_port_data(serial->port[0], NULL);
510 }
511 }
512
513
514 static int cypress_open (struct usb_serial_port *port, struct file *filp)
515 {
516 struct cypress_private *priv = usb_get_serial_port_data(port);
517 struct usb_serial *serial = port->serial;
518 unsigned long flags;
519 int result = 0;
520
521 dbg("%s - port %d", __FUNCTION__, port->number);
522
523 /* clear halts before open */
524 usb_clear_halt(serial->dev, 0x81);
525 usb_clear_halt(serial->dev, 0x02);
526
527 spin_lock_irqsave(&priv->lock, flags);
528 /* reset read/write statistics */
529 priv->bytes_in = 0;
530 priv->bytes_out = 0;
531 priv->cmd_count = 0;
532 priv->rx_flags = 0;
533 spin_unlock_irqrestore(&priv->lock, flags);
534
535 /* setting to zero could cause data loss */
536 port->tty->low_latency = 1;
537
538 /* raise both lines and set termios */
539 spin_lock_irqsave(&priv->lock, flags);
540 priv->line_control = CONTROL_DTR | CONTROL_RTS;
541 priv->cmd_ctrl = 1;
542 spin_unlock_irqrestore(&priv->lock, flags);
543 result = cypress_write(port, NULL, 0);
544
545 if (result) {
546 dev_err(&port->dev, "%s - failed setting the control lines - error %d\n", __FUNCTION__, result);
547 return result;
548 } else
549 dbg("%s - success setting the control lines", __FUNCTION__);
550
551 cypress_set_termios(port, &priv->tmp_termios);
552
553 /* setup the port and start reading from the device */
554 if(!port->interrupt_in_urb){
555 err("%s - interrupt_in_urb is empty!", __FUNCTION__);
556 return(-1);
557 }
558
559 usb_fill_int_urb(port->interrupt_in_urb, serial->dev,
560 usb_rcvintpipe(serial->dev, port->interrupt_in_endpointAddress),
561 port->interrupt_in_urb->transfer_buffer, port->interrupt_in_urb->transfer_buffer_length,
562 cypress_read_int_callback, port, interval);
563 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
564
565 if (result){
566 dev_err(&port->dev, "%s - failed submitting read urb, error %d\n", __FUNCTION__, result);
567 }
568
569 return result;
570 } /* cypress_open */
571
572
573 static void cypress_close(struct usb_serial_port *port, struct file * filp)
574 {
575 struct cypress_private *priv = usb_get_serial_port_data(port);
576 unsigned int c_cflag;
577 unsigned long flags;
578 int bps;
579 long timeout;
580 wait_queue_t wait;
581
582 dbg("%s - port %d", __FUNCTION__, port->number);
583
584 /* wait for data to drain from buffer */
585 spin_lock_irqsave(&priv->lock, flags);
586 timeout = CYPRESS_CLOSING_WAIT;
587 init_waitqueue_entry(&wait, current);
588 add_wait_queue(&port->tty->write_wait, &wait);
589 for (;;) {
590 set_current_state(TASK_INTERRUPTIBLE);
591 if (cypress_buf_data_avail(priv->buf) == 0
592 || timeout == 0 || signal_pending(current)
593 || !usb_get_intfdata(port->serial->interface))
594 break;
595 spin_unlock_irqrestore(&priv->lock, flags);
596 timeout = schedule_timeout(timeout);
597 spin_lock_irqsave(&priv->lock, flags);
598 }
599 set_current_state(TASK_RUNNING);
600 remove_wait_queue(&port->tty->write_wait, &wait);
601 /* clear out any remaining data in the buffer */
602 cypress_buf_clear(priv->buf);
603 spin_unlock_irqrestore(&priv->lock, flags);
604
605 /* wait for characters to drain from device */
606 bps = tty_get_baud_rate(port->tty);
607 if (bps > 1200)
608 timeout = max((HZ*2560)/bps,HZ/10);
609 else
610 timeout = 2*HZ;
611 set_current_state(TASK_INTERRUPTIBLE);
612 schedule_timeout(timeout);
613
614 dbg("%s - stopping urbs", __FUNCTION__);
615 usb_kill_urb (port->interrupt_in_urb);
616 usb_kill_urb (port->interrupt_out_urb);
617
618 if (port->tty) {
619 c_cflag = port->tty->termios->c_cflag;
620 if (c_cflag & HUPCL) {
621 /* drop dtr and rts */
622 priv = usb_get_serial_port_data(port);
623 spin_lock_irqsave(&priv->lock, flags);
624 priv->line_control = 0;
625 priv->cmd_ctrl = 1;
626 spin_unlock_irqrestore(&priv->lock, flags);
627 cypress_write(port, NULL, 0);
628 }
629 }
630
631 if (stats)
632 dev_info (&port->dev, "Statistics: %d Bytes In | %d Bytes Out | %d Commands Issued\n",
633 priv->bytes_in, priv->bytes_out, priv->cmd_count);
634 } /* cypress_close */
635
636
637 static int cypress_write(struct usb_serial_port *port, const unsigned char *buf, int count)
638 {
639 struct cypress_private *priv = usb_get_serial_port_data(port);
640 unsigned long flags;
641
642 dbg("%s - port %d, %d bytes", __FUNCTION__, port->number, count);
643
644 /* line control commands, which need to be executed immediately,
645 are not put into the buffer for obvious reasons.
646 */
647 if (priv->cmd_ctrl) {
648 count = 0;
649 goto finish;
650 }
651
652 if (!count)
653 return count;
654
655 spin_lock_irqsave(&priv->lock, flags);
656 count = cypress_buf_put(priv->buf, buf, count);
657 spin_unlock_irqrestore(&priv->lock, flags);
658
659 finish:
660 cypress_send(port);
661
662 return count;
663 } /* cypress_write */
664
665
666 static void cypress_send(struct usb_serial_port *port)
667 {
668 int count = 0, result, offset, actual_size;
669 struct cypress_private *priv = usb_get_serial_port_data(port);
670 unsigned long flags;
671
672 dbg("%s - port %d", __FUNCTION__, port->number);
673 dbg("%s - interrupt out size is %d", __FUNCTION__, port->interrupt_out_size);
674
675 spin_lock_irqsave(&priv->lock, flags);
676 if (priv->write_urb_in_use) {
677 dbg("%s - can't write, urb in use", __FUNCTION__);
678 spin_unlock_irqrestore(&priv->lock, flags);
679 return;
680 }
681 spin_unlock_irqrestore(&priv->lock, flags);
682
683 /* clear buffer */
684 memset(port->interrupt_out_urb->transfer_buffer, 0, port->interrupt_out_size);
685
686 spin_lock_irqsave(&priv->lock, flags);
687 switch (port->interrupt_out_size) {
688 case 32:
689 /* this is for the CY7C64013... */
690 offset = 2;
691 port->interrupt_out_buffer[0] = priv->line_control;
692 break;
693 case 8:
694 /* this is for the CY7C63743... */
695 offset = 1;
696 port->interrupt_out_buffer[0] = priv->line_control;
697 break;
698 default:
699 dbg("%s - wrong packet size", __FUNCTION__);
700 spin_unlock_irqrestore(&priv->lock, flags);
701 return;
702 }
703
704 if (priv->line_control & CONTROL_RESET)
705 priv->line_control &= ~CONTROL_RESET;
706
707 if (priv->cmd_ctrl) {
708 priv->cmd_count++;
709 dbg("%s - line control command being issued", __FUNCTION__);
710 spin_unlock_irqrestore(&priv->lock, flags);
711 goto send;
712 } else
713 spin_unlock_irqrestore(&priv->lock, flags);
714
715 count = cypress_buf_get(priv->buf, &port->interrupt_out_buffer[offset],
716 port->interrupt_out_size-offset);
717
718 if (count == 0) {
719 return;
720 }
721
722 switch (port->interrupt_out_size) {
723 case 32:
724 port->interrupt_out_buffer[1] = count;
725 break;
726 case 8:
727 port->interrupt_out_buffer[0] |= count;
728 }
729
730 dbg("%s - count is %d", __FUNCTION__, count);
731
732 send:
733 spin_lock_irqsave(&priv->lock, flags);
734 priv->write_urb_in_use = 1;
735 spin_unlock_irqrestore(&priv->lock, flags);
736
737 if (priv->cmd_ctrl)
738 actual_size = 1;
739 else
740 actual_size = count + (port->interrupt_out_size == 32 ? 2 : 1);
741
742 usb_serial_debug_data(debug, &port->dev, __FUNCTION__, port->interrupt_out_size,
743 port->interrupt_out_urb->transfer_buffer);
744
745 port->interrupt_out_urb->transfer_buffer_length = actual_size;
746 port->interrupt_out_urb->dev = port->serial->dev;
747 port->interrupt_out_urb->interval = interval;
748 result = usb_submit_urb (port->interrupt_out_urb, GFP_ATOMIC);
749 if (result) {
750 dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __FUNCTION__,
751 result);
752 priv->write_urb_in_use = 0;
753 }
754
755 spin_lock_irqsave(&priv->lock, flags);
756 if (priv->cmd_ctrl) {
757 priv->cmd_ctrl = 0;
758 }
759 priv->bytes_out += count; /* do not count the line control and size bytes */
760 spin_unlock_irqrestore(&priv->lock, flags);
761
762 schedule_work(&port->work);
763 } /* cypress_send */
764
765
766 /* returns how much space is available in the soft buffer */
767 static int cypress_write_room(struct usb_serial_port *port)
768 {
769 struct cypress_private *priv = usb_get_serial_port_data(port);
770 int room = 0;
771 unsigned long flags;
772
773 dbg("%s - port %d", __FUNCTION__, port->number);
774
775 spin_lock_irqsave(&priv->lock, flags);
776 room = cypress_buf_space_avail(priv->buf);
777 spin_unlock_irqrestore(&priv->lock, flags);
778
779 dbg("%s - returns %d", __FUNCTION__, room);
780 return room;
781 }
782
783
784 static int cypress_tiocmget (struct usb_serial_port *port, struct file *file)
785 {
786 struct cypress_private *priv = usb_get_serial_port_data(port);
787 __u8 status, control;
788 unsigned int result = 0;
789 unsigned long flags;
790
791 dbg("%s - port %d", __FUNCTION__, port->number);
792
793 spin_lock_irqsave(&priv->lock, flags);
794 control = priv->line_control;
795 status = priv->current_status;
796 spin_unlock_irqrestore(&priv->lock, flags);
797
798 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
799 | ((control & CONTROL_RTS) ? TIOCM_RTS : 0)
800 | ((status & UART_CTS) ? TIOCM_CTS : 0)
801 | ((status & UART_DSR) ? TIOCM_DSR : 0)
802 | ((status & UART_RI) ? TIOCM_RI : 0)
803 | ((status & UART_CD) ? TIOCM_CD : 0);
804
805 dbg("%s - result = %x", __FUNCTION__, result);
806
807 return result;
808 }
809
810
811 static int cypress_tiocmset (struct usb_serial_port *port, struct file *file,
812 unsigned int set, unsigned int clear)
813 {
814 struct cypress_private *priv = usb_get_serial_port_data(port);
815 unsigned long flags;
816
817 dbg("%s - port %d", __FUNCTION__, port->number);
818
819 spin_lock_irqsave(&priv->lock, flags);
820 if (set & TIOCM_RTS)
821 priv->line_control |= CONTROL_RTS;
822 if (set & TIOCM_DTR)
823 priv->line_control |= CONTROL_DTR;
824 if (clear & TIOCM_RTS)
825 priv->line_control &= ~CONTROL_RTS;
826 if (clear & TIOCM_DTR)
827 priv->line_control &= ~CONTROL_DTR;
828 spin_unlock_irqrestore(&priv->lock, flags);
829
830 priv->cmd_ctrl = 1;
831 return cypress_write(port, NULL, 0);
832 }
833
834
835 static int cypress_ioctl (struct usb_serial_port *port, struct file * file, unsigned int cmd, unsigned long arg)
836 {
837 struct cypress_private *priv = usb_get_serial_port_data(port);
838
839 dbg("%s - port %d, cmd 0x%.4x", __FUNCTION__, port->number, cmd);
840
841 switch (cmd) {
842 case TIOCGSERIAL:
843 if (copy_to_user((void __user *)arg, port->tty->termios, sizeof(struct termios))) {
844 return -EFAULT;
845 }
846 return (0);
847 break;
848 case TIOCSSERIAL:
849 if (copy_from_user(port->tty->termios, (void __user *)arg, sizeof(struct termios))) {
850 return -EFAULT;
851 }
852 /* here we need to call cypress_set_termios to invoke the new settings */
853 cypress_set_termios(port, &priv->tmp_termios);
854 return (0);
855 break;
856 /* these are called when setting baud rate from gpsd */
857 case TCGETS:
858 if (copy_to_user((void __user *)arg, port->tty->termios, sizeof(struct termios))) {
859 return -EFAULT;
860 }
861 return (0);
862 break;
863 case TCSETS:
864 if (copy_from_user(port->tty->termios, (void __user *)arg, sizeof(struct termios))) {
865 return -EFAULT;
866 }
867 /* here we need to call cypress_set_termios to invoke the new settings */
868 cypress_set_termios(port, &priv->tmp_termios);
869 return (0);
870 break;
871 /* This code comes from drivers/char/serial.c and ftdi_sio.c */
872 case TIOCMIWAIT:
873 while (priv != NULL) {
874 interruptible_sleep_on(&priv->delta_msr_wait);
875 /* see if a signal did it */
876 if (signal_pending(current))
877 return -ERESTARTSYS;
878 else {
879 char diff = priv->diff_status;
880
881 if (diff == 0) {
882 return -EIO; /* no change => error */
883 }
884
885 /* consume all events */
886 priv->diff_status = 0;
887
888 /* return 0 if caller wanted to know about these bits */
889 if ( ((arg & TIOCM_RNG) && (diff & UART_RI)) ||
890 ((arg & TIOCM_DSR) && (diff & UART_DSR)) ||
891 ((arg & TIOCM_CD) && (diff & UART_CD)) ||
892 ((arg & TIOCM_CTS) && (diff & UART_CTS)) ) {
893 return 0;
894 }
895 /* otherwise caller can't care less about what happened,
896 * and so we continue to wait for more events.
897 */
898 }
899 }
900 return 0;
901 break;
902 default:
903 break;
904 }
905
906 dbg("%s - arg not supported - it was 0x%04x - check include/asm/ioctls.h", __FUNCTION__, cmd);
907
908 return -ENOIOCTLCMD;
909 } /* cypress_ioctl */
910
911
912 static void cypress_set_termios (struct usb_serial_port *port, struct termios *old_termios)
913 {
914 struct cypress_private *priv = usb_get_serial_port_data(port);
915 struct tty_struct *tty;
916 int data_bits, stop_bits, parity_type, parity_enable;
917 unsigned cflag, iflag, baud_mask;
918 unsigned long flags;
919 __u8 oldlines;
920 int linechange = 0;
921
922 dbg("%s - port %d", __FUNCTION__, port->number);
923
924 tty = port->tty;
925 if ((!tty) || (!tty->termios)) {
926 dbg("%s - no tty structures", __FUNCTION__);
927 return;
928 }
929
930 spin_lock_irqsave(&priv->lock, flags);
931 if (!priv->termios_initialized) {
932 if (priv->chiptype == CT_EARTHMATE) {
933 *(tty->termios) = tty_std_termios;
934 tty->termios->c_cflag = B4800 | CS8 | CREAD | HUPCL | CLOCAL;
935 } else if (priv->chiptype == CT_CYPHIDCOM) {
936 *(tty->termios) = tty_std_termios;
937 tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
938 }
939 priv->termios_initialized = 1;
940 }
941 spin_unlock_irqrestore(&priv->lock, flags);
942
943 cflag = tty->termios->c_cflag;
944 iflag = tty->termios->c_iflag;
945
946 /* check if there are new settings */
947 if (old_termios) {
948 if ((cflag != old_termios->c_cflag) ||
949 (RELEVANT_IFLAG(iflag) != RELEVANT_IFLAG(old_termios->c_iflag))) {
950 dbg("%s - attempting to set new termios settings", __FUNCTION__);
951 /* should make a copy of this in case something goes wrong in the function, we can restore it */
952 spin_lock_irqsave(&priv->lock, flags);
953 priv->tmp_termios = *(tty->termios);
954 spin_unlock_irqrestore(&priv->lock, flags);
955 } else {
956 dbg("%s - nothing to do, exiting", __FUNCTION__);
957 return;
958 }
959 } else
960 return;
961
962 /* set number of data bits, parity, stop bits */
963 /* when parity is disabled the parity type bit is ignored */
964
965 stop_bits = cflag & CSTOPB ? 1 : 0; /* 1 means 2 stop bits, 0 means 1 stop bit */
966
967 if (cflag & PARENB) {
968 parity_enable = 1;
969 parity_type = cflag & PARODD ? 1 : 0; /* 1 means odd parity, 0 means even parity */
970 } else
971 parity_enable = parity_type = 0;
972
973 if (cflag & CSIZE) {
974 switch (cflag & CSIZE) {
975 case CS5: data_bits = 0; break;
976 case CS6: data_bits = 1; break;
977 case CS7: data_bits = 2; break;
978 case CS8: data_bits = 3; break;
979 default: err("%s - CSIZE was set, but not CS5-CS8", __FUNCTION__); data_bits = 3;
980 }
981 } else
982 data_bits = 3;
983
984 spin_lock_irqsave(&priv->lock, flags);
985 oldlines = priv->line_control;
986 if ((cflag & CBAUD) == B0) {
987 /* drop dtr and rts */
988 dbg("%s - dropping the lines, baud rate 0bps", __FUNCTION__);
989 baud_mask = B0;
990 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
991 } else {
992 baud_mask = (cflag & CBAUD);
993 switch(baud_mask) {
994 case B300: dbg("%s - setting baud 300bps", __FUNCTION__); break;
995 case B600: dbg("%s - setting baud 600bps", __FUNCTION__); break;
996 case B1200: dbg("%s - setting baud 1200bps", __FUNCTION__); break;
997 case B2400: dbg("%s - setting baud 2400bps", __FUNCTION__); break;
998 case B4800: dbg("%s - setting baud 4800bps", __FUNCTION__); break;
999 case B9600: dbg("%s - setting baud 9600bps", __FUNCTION__); break;
1000 case B19200: dbg("%s - setting baud 19200bps", __FUNCTION__); break;
1001 case B38400: dbg("%s - setting baud 38400bps", __FUNCTION__); break;
1002 case B57600: dbg("%s - setting baud 57600bps", __FUNCTION__); break;
1003 case B115200: dbg("%s - setting baud 115200bps", __FUNCTION__); break;
1004 default: dbg("%s - unknown masked baud rate", __FUNCTION__);
1005 }
1006 priv->line_control = (CONTROL_DTR | CONTROL_RTS);
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 /* we perform a CYPRESS_GET_CONFIG so that the current settings are filled into the private structure
1017 * this should confirm that all is working if it returns what we just set */
1018 cypress_serial_control(port, 0, 0, 0, 0, 0, 0, CYPRESS_GET_CONFIG);
1019
1020 /* Here we can define custom tty settings for devices
1021 *
1022 * the main tty termios flag base comes from empeg.c
1023 */
1024
1025 spin_lock_irqsave(&priv->lock, flags);
1026 if ( (priv->chiptype == CT_EARTHMATE) && (priv->baud_rate == 4800) ) {
1027
1028 dbg("Using custom termios settings for a baud rate of 4800bps.");
1029 /* define custom termios settings for NMEA protocol */
1030
1031 tty->termios->c_iflag /* input modes - */
1032 &= ~(IGNBRK /* disable ignore break */
1033 | BRKINT /* disable break causes interrupt */
1034 | PARMRK /* disable mark parity errors */
1035 | ISTRIP /* disable clear high bit of input characters */
1036 | INLCR /* disable translate NL to CR */
1037 | IGNCR /* disable ignore CR */
1038 | ICRNL /* disable translate CR to NL */
1039 | IXON); /* disable enable XON/XOFF flow control */
1040
1041 tty->termios->c_oflag /* output modes */
1042 &= ~OPOST; /* disable postprocess output characters */
1043
1044 tty->termios->c_lflag /* line discipline modes */
1045 &= ~(ECHO /* disable echo input characters */
1046 | ECHONL /* disable echo new line */
1047 | ICANON /* disable erase, kill, werase, and rprnt special characters */
1048 | ISIG /* disable interrupt, quit, and suspend special characters */
1049 | IEXTEN); /* disable non-POSIX special characters */
1050
1051 } /* CT_CYPHIDCOM: Application should handle this for device */
1052
1053 linechange = (priv->line_control != oldlines);
1054 spin_unlock_irqrestore(&priv->lock, flags);
1055
1056 /* if necessary, set lines */
1057 if (linechange) {
1058 priv->cmd_ctrl = 1;
1059 cypress_write(port, NULL, 0);
1060 }
1061 } /* cypress_set_termios */
1062
1063
1064 /* returns amount of data still left in soft buffer */
1065 static int cypress_chars_in_buffer(struct usb_serial_port *port)
1066 {
1067 struct cypress_private *priv = usb_get_serial_port_data(port);
1068 int chars = 0;
1069 unsigned long flags;
1070
1071 dbg("%s - port %d", __FUNCTION__, port->number);
1072
1073 spin_lock_irqsave(&priv->lock, flags);
1074 chars = cypress_buf_data_avail(priv->buf);
1075 spin_unlock_irqrestore(&priv->lock, flags);
1076
1077 dbg("%s - returns %d", __FUNCTION__, chars);
1078 return chars;
1079 }
1080
1081
1082 static void cypress_throttle (struct usb_serial_port *port)
1083 {
1084 struct cypress_private *priv = usb_get_serial_port_data(port);
1085 unsigned long flags;
1086
1087 dbg("%s - port %d", __FUNCTION__, port->number);
1088
1089 spin_lock_irqsave(&priv->lock, flags);
1090 priv->rx_flags = THROTTLED;
1091 spin_unlock_irqrestore(&priv->lock, flags);
1092 }
1093
1094
1095 static void cypress_unthrottle (struct usb_serial_port *port)
1096 {
1097 struct cypress_private *priv = usb_get_serial_port_data(port);
1098 int actually_throttled, result;
1099 unsigned long flags;
1100
1101 dbg("%s - port %d", __FUNCTION__, port->number);
1102
1103 spin_lock_irqsave(&priv->lock, flags);
1104 actually_throttled = priv->rx_flags & ACTUALLY_THROTTLED;
1105 priv->rx_flags = 0;
1106 spin_unlock_irqrestore(&priv->lock, flags);
1107
1108 if (actually_throttled) {
1109 port->interrupt_in_urb->dev = port->serial->dev;
1110
1111 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
1112 if (result)
1113 dev_err(&port->dev, "%s - failed submitting read urb, error %d\n", __FUNCTION__, result);
1114 }
1115 }
1116
1117
1118 static void cypress_read_int_callback(struct urb *urb, struct pt_regs *regs)
1119 {
1120 struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
1121 struct cypress_private *priv = usb_get_serial_port_data(port);
1122 struct tty_struct *tty;
1123 unsigned char *data = urb->transfer_buffer;
1124 unsigned long flags;
1125 char tty_flag = TTY_NORMAL;
1126 int havedata = 0;
1127 int bytes = 0;
1128 int result;
1129 int i = 0;
1130
1131 dbg("%s - port %d", __FUNCTION__, port->number);
1132
1133 if (urb->status) {
1134 dbg("%s - nonzero read status received: %d", __FUNCTION__, urb->status);
1135 return;
1136 }
1137
1138 spin_lock_irqsave(&priv->lock, flags);
1139 if (priv->rx_flags & THROTTLED) {
1140 dbg("%s - now throttling", __FUNCTION__);
1141 priv->rx_flags |= ACTUALLY_THROTTLED;
1142 spin_unlock_irqrestore(&priv->lock, flags);
1143 return;
1144 }
1145 spin_unlock_irqrestore(&priv->lock, flags);
1146
1147 tty = port->tty;
1148 if (!tty) {
1149 dbg("%s - bad tty pointer - exiting", __FUNCTION__);
1150 return;
1151 }
1152
1153 spin_lock_irqsave(&priv->lock, flags);
1154 switch(urb->actual_length) {
1155 case 32:
1156 /* This is for the CY7C64013... */
1157 priv->current_status = data[0] & 0xF8;
1158 bytes = data[1]+2;
1159 i=2;
1160 if (bytes > 2)
1161 havedata = 1;
1162 break;
1163 case 8:
1164 /* This is for the CY7C63743... */
1165 priv->current_status = data[0] & 0xF8;
1166 bytes = (data[0] & 0x07)+1;
1167 i=1;
1168 if (bytes > 1)
1169 havedata = 1;
1170 break;
1171 default:
1172 dbg("%s - wrong packet size - received %d bytes", __FUNCTION__, urb->actual_length);
1173 spin_unlock_irqrestore(&priv->lock, flags);
1174 goto continue_read;
1175 }
1176 spin_unlock_irqrestore(&priv->lock, flags);
1177
1178 usb_serial_debug_data (debug, &port->dev, __FUNCTION__, urb->actual_length, data);
1179
1180 spin_lock_irqsave(&priv->lock, flags);
1181 /* check to see if status has changed */
1182 if (priv != NULL) {
1183 if (priv->current_status != priv->prev_status) {
1184 priv->diff_status |= priv->current_status ^ priv->prev_status;
1185 wake_up_interruptible(&priv->delta_msr_wait);
1186 priv->prev_status = priv->current_status;
1187 }
1188 }
1189 spin_unlock_irqrestore(&priv->lock, flags);
1190
1191 /* hangup, as defined in acm.c... this might be a bad place for it though */
1192 if (tty && !(tty->termios->c_cflag & CLOCAL) && !(priv->current_status & UART_CD)) {
1193 dbg("%s - calling hangup", __FUNCTION__);
1194 tty_hangup(tty);
1195 goto continue_read;
1196 }
1197
1198 /* There is one error bit... I'm assuming it is a parity error indicator
1199 * as the generic firmware will set this bit to 1 if a parity error occurs.
1200 * I can not find reference to any other error events.
1201 *
1202 */
1203 spin_lock_irqsave(&priv->lock, flags);
1204 if (priv->current_status & CYP_ERROR) {
1205 spin_unlock_irqrestore(&priv->lock, flags);
1206 tty_flag = TTY_PARITY;
1207 dbg("%s - Parity Error detected", __FUNCTION__);
1208 } else
1209 spin_unlock_irqrestore(&priv->lock, flags);
1210
1211 /* process read if there is data other than line status */
1212 if (tty && (bytes > i)) {
1213 for (; i < bytes ; ++i) {
1214 dbg("pushing byte number %d - %d - %c",i,data[i],data[i]);
1215 if(tty->flip.count >= TTY_FLIPBUF_SIZE) {
1216 tty_flip_buffer_push(tty);
1217 }
1218 tty_insert_flip_char(tty, data[i], tty_flag);
1219 }
1220 tty_flip_buffer_push(port->tty);
1221 }
1222
1223 spin_lock_irqsave(&priv->lock, flags);
1224 priv->bytes_in += bytes; /* control and status byte(s) are also counted */
1225 spin_unlock_irqrestore(&priv->lock, flags);
1226
1227 continue_read:
1228
1229 /* Continue trying to always read... unless the port has closed. */
1230
1231 if (port->open_count > 0) {
1232 usb_fill_int_urb(port->interrupt_in_urb, port->serial->dev,
1233 usb_rcvintpipe(port->serial->dev, port->interrupt_in_endpointAddress),
1234 port->interrupt_in_urb->transfer_buffer,
1235 port->interrupt_in_urb->transfer_buffer_length,
1236 cypress_read_int_callback, port,
1237 interval);
1238 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
1239 if (result)
1240 dev_err(&urb->dev->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result);
1241 }
1242
1243 return;
1244 } /* cypress_read_int_callback */
1245
1246
1247 static void cypress_write_int_callback(struct urb *urb, struct pt_regs *regs)
1248 {
1249 struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
1250 struct cypress_private *priv = usb_get_serial_port_data(port);
1251 int result;
1252
1253 dbg("%s - port %d", __FUNCTION__, port->number);
1254
1255 switch (urb->status) {
1256 case 0:
1257 /* success */
1258 break;
1259 case -ECONNRESET:
1260 case -ENOENT:
1261 case -ESHUTDOWN:
1262 /* this urb is terminated, clean up */
1263 dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
1264 priv->write_urb_in_use = 0;
1265 return;
1266 case -EPIPE: /* no break needed */
1267 usb_clear_halt(port->serial->dev, 0x02);
1268 default:
1269 /* error in the urb, so we have to resubmit it */
1270 dbg("%s - Overflow in write", __FUNCTION__);
1271 dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->status);
1272 port->interrupt_out_urb->transfer_buffer_length = 1;
1273 port->interrupt_out_urb->dev = port->serial->dev;
1274 result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC);
1275 if (result)
1276 dev_err(&urb->dev->dev, "%s - failed resubmitting write urb, error %d\n",
1277 __FUNCTION__, result);
1278 else
1279 return;
1280 }
1281
1282 priv->write_urb_in_use = 0;
1283
1284 /* send any buffered data */
1285 cypress_send(port);
1286 }
1287
1288
1289 /*****************************************************************************
1290 * Write buffer functions - buffering code from pl2303 used
1291 *****************************************************************************/
1292
1293 /*
1294 * cypress_buf_alloc
1295 *
1296 * Allocate a circular buffer and all associated memory.
1297 */
1298
1299 static struct cypress_buf *cypress_buf_alloc(unsigned int size)
1300 {
1301
1302 struct cypress_buf *cb;
1303
1304
1305 if (size == 0)
1306 return NULL;
1307
1308 cb = (struct cypress_buf *)kmalloc(sizeof(struct cypress_buf), GFP_KERNEL);
1309 if (cb == NULL)
1310 return NULL;
1311
1312 cb->buf_buf = kmalloc(size, GFP_KERNEL);
1313 if (cb->buf_buf == NULL) {
1314 kfree(cb);
1315 return NULL;
1316 }
1317
1318 cb->buf_size = size;
1319 cb->buf_get = cb->buf_put = cb->buf_buf;
1320
1321 return cb;
1322
1323 }
1324
1325
1326 /*
1327 * cypress_buf_free
1328 *
1329 * Free the buffer and all associated memory.
1330 */
1331
1332 static void cypress_buf_free(struct cypress_buf *cb)
1333 {
1334 if (cb) {
1335 kfree(cb->buf_buf);
1336 kfree(cb);
1337 }
1338 }
1339
1340
1341 /*
1342 * cypress_buf_clear
1343 *
1344 * Clear out all data in the circular buffer.
1345 */
1346
1347 static void cypress_buf_clear(struct cypress_buf *cb)
1348 {
1349 if (cb != NULL)
1350 cb->buf_get = cb->buf_put;
1351 /* equivalent to a get of all data available */
1352 }
1353
1354
1355 /*
1356 * cypress_buf_data_avail
1357 *
1358 * Return the number of bytes of data available in the circular
1359 * buffer.
1360 */
1361
1362 static unsigned int cypress_buf_data_avail(struct cypress_buf *cb)
1363 {
1364 if (cb != NULL)
1365 return ((cb->buf_size + cb->buf_put - cb->buf_get) % cb->buf_size);
1366 else
1367 return 0;
1368 }
1369
1370
1371 /*
1372 * cypress_buf_space_avail
1373 *
1374 * Return the number of bytes of space available in the circular
1375 * buffer.
1376 */
1377
1378 static unsigned int cypress_buf_space_avail(struct cypress_buf *cb)
1379 {
1380 if (cb != NULL)
1381 return ((cb->buf_size + cb->buf_get - cb->buf_put - 1) % cb->buf_size);
1382 else
1383 return 0;
1384 }
1385
1386
1387 /*
1388 * cypress_buf_put
1389 *
1390 * Copy data data from a user buffer and put it into the circular buffer.
1391 * Restrict to the amount of space available.
1392 *
1393 * Return the number of bytes copied.
1394 */
1395
1396 static unsigned int cypress_buf_put(struct cypress_buf *cb, const char *buf,
1397 unsigned int count)
1398 {
1399
1400 unsigned int len;
1401
1402
1403 if (cb == NULL)
1404 return 0;
1405
1406 len = cypress_buf_space_avail(cb);
1407 if (count > len)
1408 count = len;
1409
1410 if (count == 0)
1411 return 0;
1412
1413 len = cb->buf_buf + cb->buf_size - cb->buf_put;
1414 if (count > len) {
1415 memcpy(cb->buf_put, buf, len);
1416 memcpy(cb->buf_buf, buf+len, count - len);
1417 cb->buf_put = cb->buf_buf + count - len;
1418 } else {
1419 memcpy(cb->buf_put, buf, count);
1420 if (count < len)
1421 cb->buf_put += count;
1422 else /* count == len */
1423 cb->buf_put = cb->buf_buf;
1424 }
1425
1426 return count;
1427
1428 }
1429
1430
1431 /*
1432 * cypress_buf_get
1433 *
1434 * Get data from the circular buffer and copy to the given buffer.
1435 * Restrict to the amount of data available.
1436 *
1437 * Return the number of bytes copied.
1438 */
1439
1440 static unsigned int cypress_buf_get(struct cypress_buf *cb, char *buf,
1441 unsigned int count)
1442 {
1443
1444 unsigned int len;
1445
1446
1447 if (cb == NULL)
1448 return 0;
1449
1450 len = cypress_buf_data_avail(cb);
1451 if (count > len)
1452 count = len;
1453
1454 if (count == 0)
1455 return 0;
1456
1457 len = cb->buf_buf + cb->buf_size - cb->buf_get;
1458 if (count > len) {
1459 memcpy(buf, cb->buf_get, len);
1460 memcpy(buf+len, cb->buf_buf, count - len);
1461 cb->buf_get = cb->buf_buf + count - len;
1462 } else {
1463 memcpy(buf, cb->buf_get, count);
1464 if (count < len)
1465 cb->buf_get += count;
1466 else /* count == len */
1467 cb->buf_get = cb->buf_buf;
1468 }
1469
1470 return count;
1471
1472 }
1473
1474 /*****************************************************************************
1475 * Module functions
1476 *****************************************************************************/
1477
1478 static int __init cypress_init(void)
1479 {
1480 int retval;
1481
1482 dbg("%s", __FUNCTION__);
1483
1484 retval = usb_serial_register(&cypress_earthmate_device);
1485 if (retval)
1486 goto failed_em_register;
1487 retval = usb_serial_register(&cypress_hidcom_device);
1488 if (retval)
1489 goto failed_hidcom_register;
1490 retval = usb_register(&cypress_driver);
1491 if (retval)
1492 goto failed_usb_register;
1493
1494 info(DRIVER_DESC " " DRIVER_VERSION);
1495 return 0;
1496 failed_usb_register:
1497 usb_deregister(&cypress_driver);
1498 failed_hidcom_register:
1499 usb_serial_deregister(&cypress_hidcom_device);
1500 failed_em_register:
1501 usb_serial_deregister(&cypress_earthmate_device);
1502
1503 return retval;
1504 }
1505
1506
1507 static void __exit cypress_exit (void)
1508 {
1509 dbg("%s", __FUNCTION__);
1510
1511 usb_deregister (&cypress_driver);
1512 usb_serial_deregister (&cypress_earthmate_device);
1513 usb_serial_deregister (&cypress_hidcom_device);
1514 }
1515
1516
1517 module_init(cypress_init);
1518 module_exit(cypress_exit);
1519
1520 MODULE_AUTHOR( DRIVER_AUTHOR );
1521 MODULE_DESCRIPTION( DRIVER_DESC );
1522 MODULE_VERSION( DRIVER_VERSION );
1523 MODULE_LICENSE("GPL");
1524
1525 module_param(debug, bool, S_IRUGO | S_IWUSR);
1526 MODULE_PARM_DESC(debug, "Debug enabled or not");
1527 module_param(stats, bool, S_IRUGO | S_IWUSR);
1528 MODULE_PARM_DESC(stats, "Enable statistics or not");
1529 module_param(interval, int, S_IRUGO | S_IWUSR);
1530 MODULE_PARM_DESC(interval, "Overrides interrupt interval");
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