projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Manual merge with Linus
[deliverable/linux.git] / drivers / usb / serial / cypress_m8.c
1 /*
2 * USB Cypress M8 driver
3 *
4 * Copyright (C) 2004
5 * Lonnie Mendez (dignome@gmail.com)
6 * Copyright (C) 2003,2004
7 * Neil Whelchel (koyama@firstlight.net)
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * See Documentation/usb/usb-serial.txt for more information on using this 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__,
468 serial->port[0]->number);
469 return 1;
470 }
471
472 priv = usb_get_serial_port_data(serial->port[0]);
473 priv->chiptype = CT_EARTHMATE;
474
475 return 0;
476 } /* cypress_earthmate_startup */
477
478
479 static int cypress_hidcom_startup (struct usb_serial *serial)
480 {
481 struct cypress_private *priv;
482
483 dbg("%s", __FUNCTION__);
484
485 if (generic_startup(serial)) {
486 dbg("%s - Failed setting up port %d", __FUNCTION__,
487 serial->port[0]->number);
488 return 1;
489 }
490
491 priv = usb_get_serial_port_data(serial->port[0]);
492 priv->chiptype = CT_CYPHIDCOM;
493
494 return 0;
495 } /* cypress_hidcom_startup */
496
497
498 static void cypress_shutdown (struct usb_serial *serial)
499 {
500 struct cypress_private *priv;
501
502 dbg ("%s - port %d", __FUNCTION__, serial->port[0]->number);
503
504 /* all open ports are closed at this point */
505
506 priv = usb_get_serial_port_data(serial->port[0]);
507
508 if (priv) {
509 cypress_buf_free(priv->buf);
510 kfree(priv);
511 usb_set_serial_port_data(serial->port[0], NULL);
512 }
513 }
514
515
516 static int cypress_open (struct usb_serial_port *port, struct file *filp)
517 {
518 struct cypress_private *priv = usb_get_serial_port_data(port);
519 struct usb_serial *serial = port->serial;
520 unsigned long flags;
521 int result = 0;
522
523 dbg("%s - port %d", __FUNCTION__, port->number);
524
525 /* clear halts before open */
526 usb_clear_halt(serial->dev, 0x81);
527 usb_clear_halt(serial->dev, 0x02);
528
529 spin_lock_irqsave(&priv->lock, flags);
530 /* reset read/write statistics */
531 priv->bytes_in = 0;
532 priv->bytes_out = 0;
533 priv->cmd_count = 0;
534 priv->rx_flags = 0;
535 spin_unlock_irqrestore(&priv->lock, flags);
536
537 /* setting to zero could cause data loss */
538 port->tty->low_latency = 1;
539
540 /* raise both lines and set termios */
541 spin_lock_irqsave(&priv->lock, flags);
542 priv->line_control = CONTROL_DTR | CONTROL_RTS;
543 priv->cmd_ctrl = 1;
544 spin_unlock_irqrestore(&priv->lock, flags);
545 result = cypress_write(port, NULL, 0);
546
547 if (result) {
548 dev_err(&port->dev, "%s - failed setting the control lines - error %d\n", __FUNCTION__, result);
549 return result;
550 } else
551 dbg("%s - success setting the control lines", __FUNCTION__);
552
553 cypress_set_termios(port, &priv->tmp_termios);
554
555 /* setup the port and start reading from the device */
556 if(!port->interrupt_in_urb){
557 err("%s - interrupt_in_urb is empty!", __FUNCTION__);
558 return(-1);
559 }
560
561 usb_fill_int_urb(port->interrupt_in_urb, serial->dev,
562 usb_rcvintpipe(serial->dev, port->interrupt_in_endpointAddress),
563 port->interrupt_in_urb->transfer_buffer, port->interrupt_in_urb->transfer_buffer_length,
564 cypress_read_int_callback, port, interval);
565 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
566
567 if (result){
568 dev_err(&port->dev, "%s - failed submitting read urb, error %d\n", __FUNCTION__, result);
569 }
570
571 return result;
572 } /* cypress_open */
573
574
575 static void cypress_close(struct usb_serial_port *port, struct file * filp)
576 {
577 struct cypress_private *priv = usb_get_serial_port_data(port);
578 unsigned int c_cflag;
579 unsigned long flags;
580 int bps;
581 long timeout;
582 wait_queue_t wait;
583
584 dbg("%s - port %d", __FUNCTION__, port->number);
585
586 /* wait for data to drain from buffer */
587 spin_lock_irqsave(&priv->lock, flags);
588 timeout = CYPRESS_CLOSING_WAIT;
589 init_waitqueue_entry(&wait, current);
590 add_wait_queue(&port->tty->write_wait, &wait);
591 for (;;) {
592 set_current_state(TASK_INTERRUPTIBLE);
593 if (cypress_buf_data_avail(priv->buf) == 0
594 || timeout == 0 || signal_pending(current)
595 || !usb_get_intfdata(port->serial->interface))
596 break;
597 spin_unlock_irqrestore(&priv->lock, flags);
598 timeout = schedule_timeout(timeout);
599 spin_lock_irqsave(&priv->lock, flags);
600 }
601 set_current_state(TASK_RUNNING);
602 remove_wait_queue(&port->tty->write_wait, &wait);
603 /* clear out any remaining data in the buffer */
604 cypress_buf_clear(priv->buf);
605 spin_unlock_irqrestore(&priv->lock, flags);
606
607 /* wait for characters to drain from device */
608 bps = tty_get_baud_rate(port->tty);
609 if (bps > 1200)
610 timeout = max((HZ*2560)/bps,HZ/10);
611 else
612 timeout = 2*HZ;
613 set_current_state(TASK_INTERRUPTIBLE);
614 schedule_timeout(timeout);
615
616 dbg("%s - stopping urbs", __FUNCTION__);
617 usb_kill_urb (port->interrupt_in_urb);
618 usb_kill_urb (port->interrupt_out_urb);
619
620 if (port->tty) {
621 c_cflag = port->tty->termios->c_cflag;
622 if (c_cflag & HUPCL) {
623 /* drop dtr and rts */
624 priv = usb_get_serial_port_data(port);
625 spin_lock_irqsave(&priv->lock, flags);
626 priv->line_control = 0;
627 priv->cmd_ctrl = 1;
628 spin_unlock_irqrestore(&priv->lock, flags);
629 cypress_write(port, NULL, 0);
630 }
631 }
632
633 if (stats)
634 dev_info (&port->dev, "Statistics: %d Bytes In | %d Bytes Out | %d Commands Issued\n",
635 priv->bytes_in, priv->bytes_out, priv->cmd_count);
636 } /* cypress_close */
637
638
639 static int cypress_write(struct usb_serial_port *port, const unsigned char *buf, int count)
640 {
641 struct cypress_private *priv = usb_get_serial_port_data(port);
642 unsigned long flags;
643
644 dbg("%s - port %d, %d bytes", __FUNCTION__, port->number, count);
645
646 /* line control commands, which need to be executed immediately,
647 are not put into the buffer for obvious reasons.
648 */
649 if (priv->cmd_ctrl) {
650 count = 0;
651 goto finish;
652 }
653
654 if (!count)
655 return count;
656
657 spin_lock_irqsave(&priv->lock, flags);
658 count = cypress_buf_put(priv->buf, buf, count);
659 spin_unlock_irqrestore(&priv->lock, flags);
660
661 finish:
662 cypress_send(port);
663
664 return count;
665 } /* cypress_write */
666
667
668 static void cypress_send(struct usb_serial_port *port)
669 {
670 int count = 0, result, offset, actual_size;
671 struct cypress_private *priv = usb_get_serial_port_data(port);
672 unsigned long flags;
673
674 dbg("%s - port %d", __FUNCTION__, port->number);
675 dbg("%s - interrupt out size is %d", __FUNCTION__, port->interrupt_out_size);
676
677 spin_lock_irqsave(&priv->lock, flags);
678 if (priv->write_urb_in_use) {
679 dbg("%s - can't write, urb in use", __FUNCTION__);
680 spin_unlock_irqrestore(&priv->lock, flags);
681 return;
682 }
683 spin_unlock_irqrestore(&priv->lock, flags);
684
685 /* clear buffer */
686 memset(port->interrupt_out_urb->transfer_buffer, 0, port->interrupt_out_size);
687
688 spin_lock_irqsave(&priv->lock, flags);
689 switch (port->interrupt_out_size) {
690 case 32:
691 /* this is for the CY7C64013... */
692 offset = 2;
693 port->interrupt_out_buffer[0] = priv->line_control;
694 break;
695 case 8:
696 /* this is for the CY7C63743... */
697 offset = 1;
698 port->interrupt_out_buffer[0] = priv->line_control;
699 break;
700 default:
701 dbg("%s - wrong packet size", __FUNCTION__);
702 spin_unlock_irqrestore(&priv->lock, flags);
703 return;
704 }
705
706 if (priv->line_control & CONTROL_RESET)
707 priv->line_control &= ~CONTROL_RESET;
708
709 if (priv->cmd_ctrl) {
710 priv->cmd_count++;
711 dbg("%s - line control command being issued", __FUNCTION__);
712 spin_unlock_irqrestore(&priv->lock, flags);
713 goto send;
714 } else
715 spin_unlock_irqrestore(&priv->lock, flags);
716
717 count = cypress_buf_get(priv->buf, &port->interrupt_out_buffer[offset],
718 port->interrupt_out_size-offset);
719
720 if (count == 0) {
721 return;
722 }
723
724 switch (port->interrupt_out_size) {
725 case 32:
726 port->interrupt_out_buffer[1] = count;
727 break;
728 case 8:
729 port->interrupt_out_buffer[0] |= count;
730 }
731
732 dbg("%s - count is %d", __FUNCTION__, count);
733
734 send:
735 spin_lock_irqsave(&priv->lock, flags);
736 priv->write_urb_in_use = 1;
737 spin_unlock_irqrestore(&priv->lock, flags);
738
739 if (priv->cmd_ctrl)
740 actual_size = 1;
741 else
742 actual_size = count + (port->interrupt_out_size == 32 ? 2 : 1);
743
744 usb_serial_debug_data(debug, &port->dev, __FUNCTION__, port->interrupt_out_size,
745 port->interrupt_out_urb->transfer_buffer);
746
747 port->interrupt_out_urb->transfer_buffer_length = actual_size;
748 port->interrupt_out_urb->dev = port->serial->dev;
749 port->interrupt_out_urb->interval = interval;
750 result = usb_submit_urb (port->interrupt_out_urb, GFP_ATOMIC);
751 if (result) {
752 dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __FUNCTION__,
753 result);
754 priv->write_urb_in_use = 0;
755 }
756
757 spin_lock_irqsave(&priv->lock, flags);
758 if (priv->cmd_ctrl) {
759 priv->cmd_ctrl = 0;
760 }
761 priv->bytes_out += count; /* do not count the line control and size bytes */
762 spin_unlock_irqrestore(&priv->lock, flags);
763
764 schedule_work(&port->work);
765 } /* cypress_send */
766
767
768 /* returns how much space is available in the soft buffer */
769 static int cypress_write_room(struct usb_serial_port *port)
770 {
771 struct cypress_private *priv = usb_get_serial_port_data(port);
772 int room = 0;
773 unsigned long flags;
774
775 dbg("%s - port %d", __FUNCTION__, port->number);
776
777 spin_lock_irqsave(&priv->lock, flags);
778 room = cypress_buf_space_avail(priv->buf);
779 spin_unlock_irqrestore(&priv->lock, flags);
780
781 dbg("%s - returns %d", __FUNCTION__, room);
782 return room;
783 }
784
785
786 static int cypress_tiocmget (struct usb_serial_port *port, struct file *file)
787 {
788 struct cypress_private *priv = usb_get_serial_port_data(port);
789 __u8 status, control;
790 unsigned int result = 0;
791 unsigned long flags;
792
793 dbg("%s - port %d", __FUNCTION__, port->number);
794
795 spin_lock_irqsave(&priv->lock, flags);
796 control = priv->line_control;
797 status = priv->current_status;
798 spin_unlock_irqrestore(&priv->lock, flags);
799
800 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
801 | ((control & CONTROL_RTS) ? TIOCM_RTS : 0)
802 | ((status & UART_CTS) ? TIOCM_CTS : 0)
803 | ((status & UART_DSR) ? TIOCM_DSR : 0)
804 | ((status & UART_RI) ? TIOCM_RI : 0)
805 | ((status & UART_CD) ? TIOCM_CD : 0);
806
807 dbg("%s - result = %x", __FUNCTION__, result);
808
809 return result;
810 }
811
812
813 static int cypress_tiocmset (struct usb_serial_port *port, struct file *file,
814 unsigned int set, unsigned int clear)
815 {
816 struct cypress_private *priv = usb_get_serial_port_data(port);
817 unsigned long flags;
818
819 dbg("%s - port %d", __FUNCTION__, port->number);
820
821 spin_lock_irqsave(&priv->lock, flags);
822 if (set & TIOCM_RTS)
823 priv->line_control |= CONTROL_RTS;
824 if (set & TIOCM_DTR)
825 priv->line_control |= CONTROL_DTR;
826 if (clear & TIOCM_RTS)
827 priv->line_control &= ~CONTROL_RTS;
828 if (clear & TIOCM_DTR)
829 priv->line_control &= ~CONTROL_DTR;
830 spin_unlock_irqrestore(&priv->lock, flags);
831
832 priv->cmd_ctrl = 1;
833 return cypress_write(port, NULL, 0);
834 }
835
836
837 static int cypress_ioctl (struct usb_serial_port *port, struct file * file, unsigned int cmd, unsigned long arg)
838 {
839 struct cypress_private *priv = usb_get_serial_port_data(port);
840
841 dbg("%s - port %d, cmd 0x%.4x", __FUNCTION__, port->number, cmd);
842
843 switch (cmd) {
844 case TIOCGSERIAL:
845 if (copy_to_user((void __user *)arg, port->tty->termios, sizeof(struct termios))) {
846 return -EFAULT;
847 }
848 return (0);
849 break;
850 case TIOCSSERIAL:
851 if (copy_from_user(port->tty->termios, (void __user *)arg, sizeof(struct termios))) {
852 return -EFAULT;
853 }
854 /* here we need to call cypress_set_termios to invoke the new settings */
855 cypress_set_termios(port, &priv->tmp_termios);
856 return (0);
857 break;
858 /* these are called when setting baud rate from gpsd */
859 case TCGETS:
860 if (copy_to_user((void __user *)arg, port->tty->termios, sizeof(struct termios))) {
861 return -EFAULT;
862 }
863 return (0);
864 break;
865 case TCSETS:
866 if (copy_from_user(port->tty->termios, (void __user *)arg, sizeof(struct termios))) {
867 return -EFAULT;
868 }
869 /* here we need to call cypress_set_termios to invoke the new settings */
870 cypress_set_termios(port, &priv->tmp_termios);
871 return (0);
872 break;
873 /* This code comes from drivers/char/serial.c and ftdi_sio.c */
874 case TIOCMIWAIT:
875 while (priv != NULL) {
876 interruptible_sleep_on(&priv->delta_msr_wait);
877 /* see if a signal did it */
878 if (signal_pending(current))
879 return -ERESTARTSYS;
880 else {
881 char diff = priv->diff_status;
882
883 if (diff == 0) {
884 return -EIO; /* no change => error */
885 }
886
887 /* consume all events */
888 priv->diff_status = 0;
889
890 /* return 0 if caller wanted to know about these bits */
891 if ( ((arg & TIOCM_RNG) && (diff & UART_RI)) ||
892 ((arg & TIOCM_DSR) && (diff & UART_DSR)) ||
893 ((arg & TIOCM_CD) && (diff & UART_CD)) ||
894 ((arg & TIOCM_CTS) && (diff & UART_CTS)) ) {
895 return 0;
896 }
897 /* otherwise caller can't care less about what happened,
898 * and so we continue to wait for more events.
899 */
900 }
901 }
902 return 0;
903 break;
904 default:
905 break;
906 }
907
908 dbg("%s - arg not supported - it was 0x%04x - check include/asm/ioctls.h", __FUNCTION__, cmd);
909
910 return -ENOIOCTLCMD;
911 } /* cypress_ioctl */
912
913
914 static void cypress_set_termios (struct usb_serial_port *port,
915 struct termios *old_termios)
916 {
917 struct cypress_private *priv = usb_get_serial_port_data(port);
918 struct tty_struct *tty;
919 int data_bits, stop_bits, parity_type, parity_enable;
920 unsigned cflag, iflag, baud_mask;
921 unsigned long flags;
922 __u8 oldlines;
923 int linechange = 0;
924
925 dbg("%s - port %d", __FUNCTION__, port->number);
926
927 tty = port->tty;
928 if ((!tty) || (!tty->termios)) {
929 dbg("%s - no tty structures", __FUNCTION__);
930 return;
931 }
932
933 spin_lock_irqsave(&priv->lock, flags);
934 if (!priv->termios_initialized) {
935 if (priv->chiptype == CT_EARTHMATE) {
936 *(tty->termios) = tty_std_termios;
937 tty->termios->c_cflag = B4800 | CS8 | CREAD | HUPCL |
938 CLOCAL;
939 } else if (priv->chiptype == CT_CYPHIDCOM) {
940 *(tty->termios) = tty_std_termios;
941 tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL |
942 CLOCAL;
943 }
944 priv->termios_initialized = 1;
945 }
946 spin_unlock_irqrestore(&priv->lock, flags);
947
948 cflag = tty->termios->c_cflag;
949 iflag = tty->termios->c_iflag;
950
951 /* check if there are new settings */
952 if (old_termios) {
953 if ((cflag != old_termios->c_cflag) ||
954 (RELEVANT_IFLAG(iflag) !=
955 RELEVANT_IFLAG(old_termios->c_iflag))) {
956 dbg("%s - attempting to set new termios settings",
957 __FUNCTION__);
958 /* should make a copy of this in case something goes
959 * wrong in the function, we can restore it */
960 spin_lock_irqsave(&priv->lock, flags);
961 priv->tmp_termios = *(tty->termios);
962 spin_unlock_irqrestore(&priv->lock, flags);
963 } else {
964 dbg("%s - nothing to do, exiting", __FUNCTION__);
965 return;
966 }
967 } else
968 return;
969
970 /* set number of data bits, parity, stop bits */
971 /* when parity is disabled the parity type bit is ignored */
972
973 /* 1 means 2 stop bits, 0 means 1 stop bit */
974 stop_bits = cflag & CSTOPB ? 1 : 0;
975
976 if (cflag & PARENB) {
977 parity_enable = 1;
978 /* 1 means odd parity, 0 means even parity */
979 parity_type = cflag & PARODD ? 1 : 0;
980 } else
981 parity_enable = parity_type = 0;
982
983 if (cflag & CSIZE) {
984 switch (cflag & CSIZE) {
985 case CS5:
986 data_bits = 0;
987 break;
988 case CS6:
989 data_bits = 1;
990 break;
991 case CS7:
992 data_bits = 2;
993 break;
994 case CS8:
995 data_bits = 3;
996 break;
997 default:
998 err("%s - CSIZE was set, but not CS5-CS8",
999 __FUNCTION__);
1000 data_bits = 3;
1001 }
1002 } else
1003 data_bits = 3;
1004
1005 spin_lock_irqsave(&priv->lock, flags);
1006 oldlines = priv->line_control;
1007 if ((cflag & CBAUD) == B0) {
1008 /* drop dtr and rts */
1009 dbg("%s - dropping the lines, baud rate 0bps", __FUNCTION__);
1010 baud_mask = B0;
1011 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
1012 } else {
1013 baud_mask = (cflag & CBAUD);
1014 switch(baud_mask) {
1015 case B300:
1016 dbg("%s - setting baud 300bps", __FUNCTION__);
1017 break;
1018 case B600:
1019 dbg("%s - setting baud 600bps", __FUNCTION__);
1020 break;
1021 case B1200:
1022 dbg("%s - setting baud 1200bps", __FUNCTION__);
1023 break;
1024 case B2400:
1025 dbg("%s - setting baud 2400bps", __FUNCTION__);
1026 break;
1027 case B4800:
1028 dbg("%s - setting baud 4800bps", __FUNCTION__);
1029 break;
1030 case B9600:
1031 dbg("%s - setting baud 9600bps", __FUNCTION__);
1032 break;
1033 case B19200:
1034 dbg("%s - setting baud 19200bps", __FUNCTION__);
1035 break;
1036 case B38400:
1037 dbg("%s - setting baud 38400bps", __FUNCTION__);
1038 break;
1039 case B57600:
1040 dbg("%s - setting baud 57600bps", __FUNCTION__);
1041 break;
1042 case B115200:
1043 dbg("%s - setting baud 115200bps", __FUNCTION__);
1044 break;
1045 default:
1046 dbg("%s - unknown masked baud rate", __FUNCTION__);
1047 }
1048 priv->line_control = (CONTROL_DTR | CONTROL_RTS);
1049 }
1050 spin_unlock_irqrestore(&priv->lock, flags);
1051
1052 dbg("%s - sending %d stop_bits, %d parity_enable, %d parity_type, "
1053 "%d data_bits (+5)", __FUNCTION__, stop_bits,
1054 parity_enable, parity_type, data_bits);
1055
1056 cypress_serial_control(port, baud_mask, data_bits, stop_bits,
1057 parity_enable, parity_type, 0, CYPRESS_SET_CONFIG);
1058
1059 /* we perform a CYPRESS_GET_CONFIG so that the current settings are
1060 * filled into the private structure this should confirm that all is
1061 * working if it returns what we just set */
1062 cypress_serial_control(port, 0, 0, 0, 0, 0, 0, CYPRESS_GET_CONFIG);
1063
1064 /* Here we can define custom tty settings for devices; the main tty
1065 * termios flag base comes from empeg.c */
1066
1067 spin_lock_irqsave(&priv->lock, flags);
1068 if ( (priv->chiptype == CT_EARTHMATE) && (priv->baud_rate == 4800) ) {
1069 dbg("Using custom termios settings for a baud rate of "
1070 "4800bps.");
1071 /* define custom termios settings for NMEA protocol */
1072
1073 tty->termios->c_iflag /* input modes - */
1074 &= ~(IGNBRK /* disable ignore break */
1075 | BRKINT /* disable break causes interrupt */
1076 | PARMRK /* disable mark parity errors */
1077 | ISTRIP /* disable clear high bit of input char */
1078 | INLCR /* disable translate NL to CR */
1079 | IGNCR /* disable ignore CR */
1080 | ICRNL /* disable translate CR to NL */
1081 | IXON); /* disable enable XON/XOFF flow control */
1082
1083 tty->termios->c_oflag /* output modes */
1084 &= ~OPOST; /* disable postprocess output char */
1085
1086 tty->termios->c_lflag /* line discipline modes */
1087 &= ~(ECHO /* disable echo input characters */
1088 | ECHONL /* disable echo new line */
1089 | ICANON /* disable erase, kill, werase, and rprnt
1090 special characters */
1091 | ISIG /* disable interrupt, quit, and suspend
1092 special characters */
1093 | IEXTEN); /* disable non-POSIX special characters */
1094 } /* CT_CYPHIDCOM: Application should handle this for device */
1095
1096 linechange = (priv->line_control != oldlines);
1097 spin_unlock_irqrestore(&priv->lock, flags);
1098
1099 /* if necessary, set lines */
1100 if (linechange) {
1101 priv->cmd_ctrl = 1;
1102 cypress_write(port, NULL, 0);
1103 }
1104 } /* cypress_set_termios */
1105
1106
1107 /* returns amount of data still left in soft buffer */
1108 static int cypress_chars_in_buffer(struct usb_serial_port *port)
1109 {
1110 struct cypress_private *priv = usb_get_serial_port_data(port);
1111 int chars = 0;
1112 unsigned long flags;
1113
1114 dbg("%s - port %d", __FUNCTION__, port->number);
1115
1116 spin_lock_irqsave(&priv->lock, flags);
1117 chars = cypress_buf_data_avail(priv->buf);
1118 spin_unlock_irqrestore(&priv->lock, flags);
1119
1120 dbg("%s - returns %d", __FUNCTION__, chars);
1121 return chars;
1122 }
1123
1124
1125 static void cypress_throttle (struct usb_serial_port *port)
1126 {
1127 struct cypress_private *priv = usb_get_serial_port_data(port);
1128 unsigned long flags;
1129
1130 dbg("%s - port %d", __FUNCTION__, port->number);
1131
1132 spin_lock_irqsave(&priv->lock, flags);
1133 priv->rx_flags = THROTTLED;
1134 spin_unlock_irqrestore(&priv->lock, flags);
1135 }
1136
1137
1138 static void cypress_unthrottle (struct usb_serial_port *port)
1139 {
1140 struct cypress_private *priv = usb_get_serial_port_data(port);
1141 int actually_throttled, result;
1142 unsigned long flags;
1143
1144 dbg("%s - port %d", __FUNCTION__, port->number);
1145
1146 spin_lock_irqsave(&priv->lock, flags);
1147 actually_throttled = priv->rx_flags & ACTUALLY_THROTTLED;
1148 priv->rx_flags = 0;
1149 spin_unlock_irqrestore(&priv->lock, flags);
1150
1151 if (actually_throttled) {
1152 port->interrupt_in_urb->dev = port->serial->dev;
1153
1154 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
1155 if (result)
1156 dev_err(&port->dev, "%s - failed submitting read urb, "
1157 "error %d\n", __FUNCTION__, result);
1158 }
1159 }
1160
1161
1162 static void cypress_read_int_callback(struct urb *urb, struct pt_regs *regs)
1163 {
1164 struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
1165 struct cypress_private *priv = usb_get_serial_port_data(port);
1166 struct tty_struct *tty;
1167 unsigned char *data = urb->transfer_buffer;
1168 unsigned long flags;
1169 char tty_flag = TTY_NORMAL;
1170 int havedata = 0;
1171 int bytes = 0;
1172 int result;
1173 int i = 0;
1174
1175 dbg("%s - port %d", __FUNCTION__, port->number);
1176
1177 if (urb->status) {
1178 dbg("%s - nonzero read status received: %d", __FUNCTION__,
1179 urb->status);
1180 return;
1181 }
1182
1183 spin_lock_irqsave(&priv->lock, flags);
1184 if (priv->rx_flags & THROTTLED) {
1185 dbg("%s - now throttling", __FUNCTION__);
1186 priv->rx_flags |= ACTUALLY_THROTTLED;
1187 spin_unlock_irqrestore(&priv->lock, flags);
1188 return;
1189 }
1190 spin_unlock_irqrestore(&priv->lock, flags);
1191
1192 tty = port->tty;
1193 if (!tty) {
1194 dbg("%s - bad tty pointer - exiting", __FUNCTION__);
1195 return;
1196 }
1197
1198 spin_lock_irqsave(&priv->lock, flags);
1199 switch(urb->actual_length) {
1200 case 32:
1201 /* This is for the CY7C64013... */
1202 priv->current_status = data[0] & 0xF8;
1203 bytes = data[1] + 2;
1204 i = 2;
1205 if (bytes > 2)
1206 havedata = 1;
1207 break;
1208 case 8:
1209 /* This is for the CY7C63743... */
1210 priv->current_status = data[0] & 0xF8;
1211 bytes = (data[0] & 0x07) + 1;
1212 i = 1;
1213 if (bytes > 1)
1214 havedata = 1;
1215 break;
1216 default:
1217 dbg("%s - wrong packet size - received %d bytes",
1218 __FUNCTION__, urb->actual_length);
1219 spin_unlock_irqrestore(&priv->lock, flags);
1220 goto continue_read;
1221 }
1222 spin_unlock_irqrestore(&priv->lock, flags);
1223
1224 usb_serial_debug_data (debug, &port->dev, __FUNCTION__,
1225 urb->actual_length, data);
1226
1227 spin_lock_irqsave(&priv->lock, flags);
1228 /* check to see if status has changed */
1229 if (priv != NULL) {
1230 if (priv->current_status != priv->prev_status) {
1231 priv->diff_status |= priv->current_status ^
1232 priv->prev_status;
1233 wake_up_interruptible(&priv->delta_msr_wait);
1234 priv->prev_status = priv->current_status;
1235 }
1236 }
1237 spin_unlock_irqrestore(&priv->lock, flags);
1238
1239 /* hangup, as defined in acm.c... this might be a bad place for it
1240 * though */
1241 if (tty && !(tty->termios->c_cflag & CLOCAL) &&
1242 !(priv->current_status & UART_CD)) {
1243 dbg("%s - calling hangup", __FUNCTION__);
1244 tty_hangup(tty);
1245 goto continue_read;
1246 }
1247
1248 /* There is one error bit... I'm assuming it is a parity error
1249 * indicator as the generic firmware will set this bit to 1 if a
1250 * parity error occurs.
1251 * I can not find reference to any other error events. */
1252 spin_lock_irqsave(&priv->lock, flags);
1253 if (priv->current_status & CYP_ERROR) {
1254 spin_unlock_irqrestore(&priv->lock, flags);
1255 tty_flag = TTY_PARITY;
1256 dbg("%s - Parity Error detected", __FUNCTION__);
1257 } else
1258 spin_unlock_irqrestore(&priv->lock, flags);
1259
1260 /* process read if there is data other than line status */
1261 if (tty && (bytes > i)) {
1262 for (; i < bytes ; ++i) {
1263 dbg("pushing byte number %d - %d - %c", i, data[i],
1264 data[i]);
1265 if(tty->flip.count >= TTY_FLIPBUF_SIZE) {
1266 tty_flip_buffer_push(tty);
1267 }
1268 tty_insert_flip_char(tty, data[i], tty_flag);
1269 }
1270 tty_flip_buffer_push(port->tty);
1271 }
1272
1273 spin_lock_irqsave(&priv->lock, flags);
1274 /* control and status byte(s) are also counted */
1275 priv->bytes_in += bytes;
1276 spin_unlock_irqrestore(&priv->lock, flags);
1277
1278 continue_read:
1279
1280 /* Continue trying to always read... unless the port has closed. */
1281
1282 if (port->open_count > 0) {
1283 usb_fill_int_urb(port->interrupt_in_urb, port->serial->dev,
1284 usb_rcvintpipe(port->serial->dev,
1285 port->interrupt_in_endpointAddress),
1286 port->interrupt_in_urb->transfer_buffer,
1287 port->interrupt_in_urb->transfer_buffer_length,
1288 cypress_read_int_callback, port, interval);
1289 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
1290 if (result)
1291 dev_err(&urb->dev->dev, "%s - failed resubmitting "
1292 "read urb, error %d\n", __FUNCTION__,
1293 result);
1294 }
1295
1296 return;
1297 } /* cypress_read_int_callback */
1298
1299
1300 static void cypress_write_int_callback(struct urb *urb, struct pt_regs *regs)
1301 {
1302 struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
1303 struct cypress_private *priv = usb_get_serial_port_data(port);
1304 int result;
1305
1306 dbg("%s - port %d", __FUNCTION__, port->number);
1307
1308 switch (urb->status) {
1309 case 0:
1310 /* success */
1311 break;
1312 case -ECONNRESET:
1313 case -ENOENT:
1314 case -ESHUTDOWN:
1315 /* this urb is terminated, clean up */
1316 dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
1317 priv->write_urb_in_use = 0;
1318 return;
1319 case -EPIPE: /* no break needed */
1320 usb_clear_halt(port->serial->dev, 0x02);
1321 default:
1322 /* error in the urb, so we have to resubmit it */
1323 dbg("%s - Overflow in write", __FUNCTION__);
1324 dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->status);
1325 port->interrupt_out_urb->transfer_buffer_length = 1;
1326 port->interrupt_out_urb->dev = port->serial->dev;
1327 result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC);
1328 if (result)
1329 dev_err(&urb->dev->dev, "%s - failed resubmitting write urb, error %d\n",
1330 __FUNCTION__, result);
1331 else
1332 return;
1333 }
1334
1335 priv->write_urb_in_use = 0;
1336
1337 /* send any buffered data */
1338 cypress_send(port);
1339 }
1340
1341
1342 /*****************************************************************************
1343 * Write buffer functions - buffering code from pl2303 used
1344 *****************************************************************************/
1345
1346 /*
1347 * cypress_buf_alloc
1348 *
1349 * Allocate a circular buffer and all associated memory.
1350 */
1351
1352 static struct cypress_buf *cypress_buf_alloc(unsigned int size)
1353 {
1354
1355 struct cypress_buf *cb;
1356
1357
1358 if (size == 0)
1359 return NULL;
1360
1361 cb = (struct cypress_buf *)kmalloc(sizeof(struct cypress_buf), GFP_KERNEL);
1362 if (cb == NULL)
1363 return NULL;
1364
1365 cb->buf_buf = kmalloc(size, GFP_KERNEL);
1366 if (cb->buf_buf == NULL) {
1367 kfree(cb);
1368 return NULL;
1369 }
1370
1371 cb->buf_size = size;
1372 cb->buf_get = cb->buf_put = cb->buf_buf;
1373
1374 return cb;
1375
1376 }
1377
1378
1379 /*
1380 * cypress_buf_free
1381 *
1382 * Free the buffer and all associated memory.
1383 */
1384
1385 static void cypress_buf_free(struct cypress_buf *cb)
1386 {
1387 if (cb) {
1388 kfree(cb->buf_buf);
1389 kfree(cb);
1390 }
1391 }
1392
1393
1394 /*
1395 * cypress_buf_clear
1396 *
1397 * Clear out all data in the circular buffer.
1398 */
1399
1400 static void cypress_buf_clear(struct cypress_buf *cb)
1401 {
1402 if (cb != NULL)
1403 cb->buf_get = cb->buf_put;
1404 /* equivalent to a get of all data available */
1405 }
1406
1407
1408 /*
1409 * cypress_buf_data_avail
1410 *
1411 * Return the number of bytes of data available in the circular
1412 * buffer.
1413 */
1414
1415 static unsigned int cypress_buf_data_avail(struct cypress_buf *cb)
1416 {
1417 if (cb != NULL)
1418 return ((cb->buf_size + cb->buf_put - cb->buf_get) % cb->buf_size);
1419 else
1420 return 0;
1421 }
1422
1423
1424 /*
1425 * cypress_buf_space_avail
1426 *
1427 * Return the number of bytes of space available in the circular
1428 * buffer.
1429 */
1430
1431 static unsigned int cypress_buf_space_avail(struct cypress_buf *cb)
1432 {
1433 if (cb != NULL)
1434 return ((cb->buf_size + cb->buf_get - cb->buf_put - 1) % cb->buf_size);
1435 else
1436 return 0;
1437 }
1438
1439
1440 /*
1441 * cypress_buf_put
1442 *
1443 * Copy data data from a user buffer and put it into the circular buffer.
1444 * Restrict to the amount of space available.
1445 *
1446 * Return the number of bytes copied.
1447 */
1448
1449 static unsigned int cypress_buf_put(struct cypress_buf *cb, const char *buf,
1450 unsigned int count)
1451 {
1452
1453 unsigned int len;
1454
1455
1456 if (cb == NULL)
1457 return 0;
1458
1459 len = cypress_buf_space_avail(cb);
1460 if (count > len)
1461 count = len;
1462
1463 if (count == 0)
1464 return 0;
1465
1466 len = cb->buf_buf + cb->buf_size - cb->buf_put;
1467 if (count > len) {
1468 memcpy(cb->buf_put, buf, len);
1469 memcpy(cb->buf_buf, buf+len, count - len);
1470 cb->buf_put = cb->buf_buf + count - len;
1471 } else {
1472 memcpy(cb->buf_put, buf, count);
1473 if (count < len)
1474 cb->buf_put += count;
1475 else /* count == len */
1476 cb->buf_put = cb->buf_buf;
1477 }
1478
1479 return count;
1480
1481 }
1482
1483
1484 /*
1485 * cypress_buf_get
1486 *
1487 * Get data from the circular buffer and copy to the given buffer.
1488 * Restrict to the amount of data available.
1489 *
1490 * Return the number of bytes copied.
1491 */
1492
1493 static unsigned int cypress_buf_get(struct cypress_buf *cb, char *buf,
1494 unsigned int count)
1495 {
1496
1497 unsigned int len;
1498
1499
1500 if (cb == NULL)
1501 return 0;
1502
1503 len = cypress_buf_data_avail(cb);
1504 if (count > len)
1505 count = len;
1506
1507 if (count == 0)
1508 return 0;
1509
1510 len = cb->buf_buf + cb->buf_size - cb->buf_get;
1511 if (count > len) {
1512 memcpy(buf, cb->buf_get, len);
1513 memcpy(buf+len, cb->buf_buf, count - len);
1514 cb->buf_get = cb->buf_buf + count - len;
1515 } else {
1516 memcpy(buf, cb->buf_get, count);
1517 if (count < len)
1518 cb->buf_get += count;
1519 else /* count == len */
1520 cb->buf_get = cb->buf_buf;
1521 }
1522
1523 return count;
1524
1525 }
1526
1527 /*****************************************************************************
1528 * Module functions
1529 *****************************************************************************/
1530
1531 static int __init cypress_init(void)
1532 {
1533 int retval;
1534
1535 dbg("%s", __FUNCTION__);
1536
1537 retval = usb_serial_register(&cypress_earthmate_device);
1538 if (retval)
1539 goto failed_em_register;
1540 retval = usb_serial_register(&cypress_hidcom_device);
1541 if (retval)
1542 goto failed_hidcom_register;
1543 retval = usb_register(&cypress_driver);
1544 if (retval)
1545 goto failed_usb_register;
1546
1547 info(DRIVER_DESC " " DRIVER_VERSION);
1548 return 0;
1549 failed_usb_register:
1550 usb_deregister(&cypress_driver);
1551 failed_hidcom_register:
1552 usb_serial_deregister(&cypress_hidcom_device);
1553 failed_em_register:
1554 usb_serial_deregister(&cypress_earthmate_device);
1555
1556 return retval;
1557 }
1558
1559
1560 static void __exit cypress_exit (void)
1561 {
1562 dbg("%s", __FUNCTION__);
1563
1564 usb_deregister (&cypress_driver);
1565 usb_serial_deregister (&cypress_earthmate_device);
1566 usb_serial_deregister (&cypress_hidcom_device);
1567 }
1568
1569
1570 module_init(cypress_init);
1571 module_exit(cypress_exit);
1572
1573 MODULE_AUTHOR( DRIVER_AUTHOR );
1574 MODULE_DESCRIPTION( DRIVER_DESC );
1575 MODULE_VERSION( DRIVER_VERSION );
1576 MODULE_LICENSE("GPL");
1577
1578 module_param(debug, bool, S_IRUGO | S_IWUSR);
1579 MODULE_PARM_DESC(debug, "Debug enabled or not");
1580 module_param(stats, bool, S_IRUGO | S_IWUSR);
1581 MODULE_PARM_DESC(stats, "Enable statistics or not");
1582 module_param(interval, int, S_IRUGO | S_IWUSR);
1583 MODULE_PARM_DESC(interval, "Overrides interrupt interval");
Linux kernel - Deliverables
This page took 0.063566 seconds and 6 git commands to generate.