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OMAP3: PM: decouple PER and CORE context save and restore
[linux-ginger.git] / drivers / usb / serial / cypress_m8.c
bloba591ebec0f89c0af5d0ece8c3e9685fbe3d80d4f
1 /*
2 * USB Cypress M8 driver
3 *
4 * Copyright (C) 2004
5 * Lonnie Mendez (dignome@gmail.com)
6 * Copyright (C) 2003,2004
7 * Neil Whelchel (koyama@firstlight.net)
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * See Documentation/usb/usb-serial.txt for more information on using this
15 * driver
16 *
17 * See http://geocities.com/i0xox0i for information on this driver and the
18 * earthmate usb device.
19 *
20 * Lonnie Mendez <dignome@gmail.com>
21 * 4-29-2005
22 * Fixed problem where setting or retreiving the serial config would fail
23 * with EPIPE. Removed CRTS toggling so the driver behaves more like
24 * other usbserial adapters. Issued new interval of 1ms instead of the
25 * default 10ms. As a result, transfer speed has been substantially
26 * increased from avg. 850bps to avg. 3300bps. initial termios has also
27 * been modified. Cleaned up code and formatting issues so it is more
28 * readable. Replaced the C++ style comments.
29 *
30 * Lonnie Mendez <dignome@gmail.com>
31 * 12-15-2004
32 * Incorporated write buffering from pl2303 driver. Fixed bug with line
33 * handling so both lines are raised in cypress_open. (was dropping rts)
34 * Various code cleanups made as well along with other misc bug fixes.
35 *
36 * Lonnie Mendez <dignome@gmail.com>
37 * 04-10-2004
38 * Driver modified to support dynamic line settings. Various improvments
39 * and features.
40 *
41 * Neil Whelchel
42 * 10-2003
43 * Driver first released.
44 *
45 */
46
47 /* Thanks to Neil Whelchel for writing the first cypress m8 implementation
48 for linux. */
49 /* Thanks to cypress for providing references for the hid reports. */
50 /* Thanks to Jiang Zhang for providing links and for general help. */
51 /* Code originates and was built up from ftdi_sio, belkin, pl2303 and others.*/
52
53
54 #include <linux/kernel.h>
55 #include <linux/errno.h>
56 #include <linux/init.h>
57 #include <linux/slab.h>
58 #include <linux/tty.h>
59 #include <linux/tty_driver.h>
60 #include <linux/tty_flip.h>
61 #include <linux/module.h>
62 #include <linux/moduleparam.h>
63 #include <linux/spinlock.h>
64 #include <linux/usb.h>
65 #include <linux/usb/serial.h>
66 #include <linux/serial.h>
67 #include <linux/delay.h>
68 #include <linux/uaccess.h>
69
70 #include "cypress_m8.h"
71
72
73 #ifdef CONFIG_USB_SERIAL_DEBUG
74 static int debug = 1;
75 #else
76 static int debug;
77 #endif
78 static int stats;
79 static int interval;
80
81 /*
82 * Version Information
83 */
84 #define DRIVER_VERSION "v1.09"
85 #define DRIVER_AUTHOR "Lonnie Mendez <dignome@gmail.com>, Neil Whelchel <koyama@firstlight.net>"
86 #define DRIVER_DESC "Cypress USB to Serial Driver"
87
88 /* write buffer size defines */
89 #define CYPRESS_BUF_SIZE 1024
90 #define CYPRESS_CLOSING_WAIT (30*HZ)
91
92 static struct usb_device_id id_table_earthmate [] = {
93 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
94 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
95 { } /* Terminating entry */
96 };
97
98 static struct usb_device_id id_table_cyphidcomrs232 [] = {
99 { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
100 { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) },
101 { } /* Terminating entry */
102 };
103
104 static struct usb_device_id id_table_nokiaca42v2 [] = {
105 { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
106 { } /* Terminating entry */
107 };
108
109 static struct usb_device_id id_table_combined [] = {
110 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
111 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
112 { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
113 { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) },
114 { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
115 { } /* Terminating entry */
116 };
117
118 MODULE_DEVICE_TABLE(usb, id_table_combined);
119
120 static struct usb_driver cypress_driver = {
121 .name = "cypress",
122 .probe = usb_serial_probe,
123 .disconnect = usb_serial_disconnect,
124 .id_table = id_table_combined,
125 .no_dynamic_id = 1,
126 };
127
128 enum packet_format {
129 packet_format_1, /* b0:status, b1:payload count */
130 packet_format_2 /* b0[7:3]:status, b0[2:0]:payload count */
131 };
132
133 struct cypress_private {
134 spinlock_t lock; /* private lock */
135 int chiptype; /* identifier of device, for quirks/etc */
136 int bytes_in; /* used for statistics */
137 int bytes_out; /* used for statistics */
138 int cmd_count; /* used for statistics */
139 int cmd_ctrl; /* always set this to 1 before issuing a command */
140 struct cypress_buf *buf; /* write buffer */
141 int write_urb_in_use; /* write urb in use indicator */
142 int write_urb_interval; /* interval to use for write urb */
143 int read_urb_interval; /* interval to use for read urb */
144 int comm_is_ok; /* true if communication is (still) ok */
145 int termios_initialized;
146 __u8 line_control; /* holds dtr / rts value */
147 __u8 current_status; /* received from last read - info on dsr,cts,cd,ri,etc */
148 __u8 current_config; /* stores the current configuration byte */
149 __u8 rx_flags; /* throttling - used from whiteheat/ftdi_sio */
150 enum packet_format pkt_fmt; /* format to use for packet send / receive */
151 int get_cfg_unsafe; /* If true, the CYPRESS_GET_CONFIG is unsafe */
152 int baud_rate; /* stores current baud rate in
153 integer form */
154 int isthrottled; /* if throttled, discard reads */
155 wait_queue_head_t delta_msr_wait; /* used for TIOCMIWAIT */
156 char prev_status, diff_status; /* used for TIOCMIWAIT */
157 /* we pass a pointer to this as the arguement sent to
158 cypress_set_termios old_termios */
159 struct ktermios tmp_termios; /* stores the old termios settings */
160 };
161
162 /* write buffer structure */
163 struct cypress_buf {
164 unsigned int buf_size;
165 char *buf_buf;
166 char *buf_get;
167 char *buf_put;
168 };
169
170 /* function prototypes for the Cypress USB to serial device */
171 static int cypress_earthmate_startup(struct usb_serial *serial);
172 static int cypress_hidcom_startup(struct usb_serial *serial);
173 static int cypress_ca42v2_startup(struct usb_serial *serial);
174 static void cypress_release(struct usb_serial *serial);
175 static int cypress_open(struct tty_struct *tty, struct usb_serial_port *port);
176 static void cypress_close(struct usb_serial_port *port);
177 static void cypress_dtr_rts(struct usb_serial_port *port, int on);
178 static int cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
179 const unsigned char *buf, int count);
180 static void cypress_send(struct usb_serial_port *port);
181 static int cypress_write_room(struct tty_struct *tty);
182 static int cypress_ioctl(struct tty_struct *tty, struct file *file,
183 unsigned int cmd, unsigned long arg);
184 static void cypress_set_termios(struct tty_struct *tty,
185 struct usb_serial_port *port, struct ktermios *old);
186 static int cypress_tiocmget(struct tty_struct *tty, struct file *file);
187 static int cypress_tiocmset(struct tty_struct *tty, struct file *file,
188 unsigned int set, unsigned int clear);
189 static int cypress_chars_in_buffer(struct tty_struct *tty);
190 static void cypress_throttle(struct tty_struct *tty);
191 static void cypress_unthrottle(struct tty_struct *tty);
192 static void cypress_set_dead(struct usb_serial_port *port);
193 static void cypress_read_int_callback(struct urb *urb);
194 static void cypress_write_int_callback(struct urb *urb);
195 /* write buffer functions */
196 static struct cypress_buf *cypress_buf_alloc(unsigned int size);
197 static void cypress_buf_free(struct cypress_buf *cb);
198 static void cypress_buf_clear(struct cypress_buf *cb);
199 static unsigned int cypress_buf_data_avail(struct cypress_buf *cb);
200 static unsigned int cypress_buf_space_avail(struct cypress_buf *cb);
201 static unsigned int cypress_buf_put(struct cypress_buf *cb,
202 const char *buf, unsigned int count);
203 static unsigned int cypress_buf_get(struct cypress_buf *cb,
204 char *buf, unsigned int count);
205
206
207 static struct usb_serial_driver cypress_earthmate_device = {
208 .driver = {
209 .owner = THIS_MODULE,
210 .name = "earthmate",
211 },
212 .description = "DeLorme Earthmate USB",
213 .usb_driver = &cypress_driver,
214 .id_table = id_table_earthmate,
215 .num_ports = 1,
216 .attach = cypress_earthmate_startup,
217 .release = cypress_release,
218 .open = cypress_open,
219 .close = cypress_close,
220 .dtr_rts = cypress_dtr_rts,
221 .write = cypress_write,
222 .write_room = cypress_write_room,
223 .ioctl = cypress_ioctl,
224 .set_termios = cypress_set_termios,
225 .tiocmget = cypress_tiocmget,
226 .tiocmset = cypress_tiocmset,
227 .chars_in_buffer = cypress_chars_in_buffer,
228 .throttle = cypress_throttle,
229 .unthrottle = cypress_unthrottle,
230 .read_int_callback = cypress_read_int_callback,
231 .write_int_callback = cypress_write_int_callback,
232 };
233
234 static struct usb_serial_driver cypress_hidcom_device = {
235 .driver = {
236 .owner = THIS_MODULE,
237 .name = "cyphidcom",
238 },
239 .description = "HID->COM RS232 Adapter",
240 .usb_driver = &cypress_driver,
241 .id_table = id_table_cyphidcomrs232,
242 .num_ports = 1,
243 .attach = cypress_hidcom_startup,
244 .release = cypress_release,
245 .open = cypress_open,
246 .close = cypress_close,
247 .dtr_rts = cypress_dtr_rts,
248 .write = cypress_write,
249 .write_room = cypress_write_room,
250 .ioctl = cypress_ioctl,
251 .set_termios = cypress_set_termios,
252 .tiocmget = cypress_tiocmget,
253 .tiocmset = cypress_tiocmset,
254 .chars_in_buffer = cypress_chars_in_buffer,
255 .throttle = cypress_throttle,
256 .unthrottle = cypress_unthrottle,
257 .read_int_callback = cypress_read_int_callback,
258 .write_int_callback = cypress_write_int_callback,
259 };
260
261 static struct usb_serial_driver cypress_ca42v2_device = {
262 .driver = {
263 .owner = THIS_MODULE,
264 .name = "nokiaca42v2",
265 },
266 .description = "Nokia CA-42 V2 Adapter",
267 .usb_driver = &cypress_driver,
268 .id_table = id_table_nokiaca42v2,
269 .num_ports = 1,
270 .attach = cypress_ca42v2_startup,
271 .release = cypress_release,
272 .open = cypress_open,
273 .close = cypress_close,
274 .dtr_rts = cypress_dtr_rts,
275 .write = cypress_write,
276 .write_room = cypress_write_room,
277 .ioctl = cypress_ioctl,
278 .set_termios = cypress_set_termios,
279 .tiocmget = cypress_tiocmget,
280 .tiocmset = cypress_tiocmset,
281 .chars_in_buffer = cypress_chars_in_buffer,
282 .throttle = cypress_throttle,
283 .unthrottle = cypress_unthrottle,
284 .read_int_callback = cypress_read_int_callback,
285 .write_int_callback = cypress_write_int_callback,
286 };
287
288 /*****************************************************************************
289 * Cypress serial helper functions
290 *****************************************************************************/
291
292
293 static int analyze_baud_rate(struct usb_serial_port *port, speed_t new_rate)
294 {
295 struct cypress_private *priv;
296 priv = usb_get_serial_port_data(port);
297
298 /*
299 * The general purpose firmware for the Cypress M8 allows for
300 * a maximum speed of 57600bps (I have no idea whether DeLorme
301 * chose to use the general purpose firmware or not), if you
302 * need to modify this speed setting for your own project
303 * please add your own chiptype and modify the code likewise.
304 * The Cypress HID->COM device will work successfully up to
305 * 115200bps (but the actual throughput is around 3kBps).
306 */
307 if (port->serial->dev->speed == USB_SPEED_LOW) {
308 /*
309 * Mike Isely <isely@pobox.com> 2-Feb-2008: The
310 * Cypress app note that describes this mechanism
311 * states the the low-speed part can't handle more
312 * than 800 bytes/sec, in which case 4800 baud is the
313 * safest speed for a part like that.
314 */
315 if (new_rate > 4800) {
316 dbg("%s - failed setting baud rate, device incapable "
317 "speed %d", __func__, new_rate);
318 return -1;
319 }
320 }
321 switch (priv->chiptype) {
322 case CT_EARTHMATE:
323 if (new_rate <= 600) {
324 /* 300 and 600 baud rates are supported under
325 * the generic firmware, but are not used with
326 * NMEA and SiRF protocols */
327 dbg("%s - failed setting baud rate, unsupported speed "
328 "of %d on Earthmate GPS", __func__, new_rate);
329 return -1;
330 }
331 break;
332 default:
333 break;
334 }
335 return new_rate;
336 }
337
338
339 /* This function can either set or retrieve the current serial line settings */
340 static int cypress_serial_control(struct tty_struct *tty,
341 struct usb_serial_port *port, speed_t baud_rate, int data_bits,
342 int stop_bits, int parity_enable, int parity_type, int reset,
343 int cypress_request_type)
344 {
345 int new_baudrate = 0, retval = 0, tries = 0;
346 struct cypress_private *priv;
347 __u8 feature_buffer[5];
348 unsigned long flags;
349
350 dbg("%s", __func__);
351
352 priv = usb_get_serial_port_data(port);
353
354 if (!priv->comm_is_ok)
355 return -ENODEV;
356
357 switch (cypress_request_type) {
358 case CYPRESS_SET_CONFIG:
359 new_baudrate = priv->baud_rate;
360 /* 0 means 'Hang up' so doesn't change the true bit rate */
361 if (baud_rate == 0)
362 new_baudrate = priv->baud_rate;
363 /* Change of speed ? */
364 else if (baud_rate != priv->baud_rate) {
365 dbg("%s - baud rate is changing", __func__);
366 retval = analyze_baud_rate(port, baud_rate);
367 if (retval >= 0) {
368 new_baudrate = retval;
369 dbg("%s - New baud rate set to %d",
370 __func__, new_baudrate);
371 }
372 }
373 dbg("%s - baud rate is being sent as %d",
374 __func__, new_baudrate);
375
376 memset(feature_buffer, 0, sizeof(feature_buffer));
377 /* fill the feature_buffer with new configuration */
378 *((u_int32_t *)feature_buffer) = new_baudrate;
379 feature_buffer[4] |= data_bits; /* assign data bits in 2 bit space ( max 3 ) */
380 /* 1 bit gap */
381 feature_buffer[4] |= (stop_bits << 3); /* assign stop bits in 1 bit space */
382 feature_buffer[4] |= (parity_enable << 4); /* assign parity flag in 1 bit space */
383 feature_buffer[4] |= (parity_type << 5); /* assign parity type in 1 bit space */
384 /* 1 bit gap */
385 feature_buffer[4] |= (reset << 7); /* assign reset at end of byte, 1 bit space */
386
387 dbg("%s - device is being sent this feature report:",
388 __func__);
389 dbg("%s - %02X - %02X - %02X - %02X - %02X", __func__,
390 feature_buffer[0], feature_buffer[1],
391 feature_buffer[2], feature_buffer[3],
392 feature_buffer[4]);
393
394 do {
395 retval = usb_control_msg(port->serial->dev,
396 usb_sndctrlpipe(port->serial->dev, 0),
397 HID_REQ_SET_REPORT,
398 USB_DIR_OUT | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
399 0x0300, 0, feature_buffer,
400 sizeof(feature_buffer), 500);
401
402 if (tries++ >= 3)
403 break;
404
405 } while (retval != sizeof(feature_buffer) &&
406 retval != -ENODEV);
407
408 if (retval != sizeof(feature_buffer)) {
409 dev_err(&port->dev, "%s - failed sending serial "
410 "line settings - %d\n", __func__, retval);
411 cypress_set_dead(port);
412 } else {
413 spin_lock_irqsave(&priv->lock, flags);
414 priv->baud_rate = new_baudrate;
415 priv->current_config = feature_buffer[4];
416 spin_unlock_irqrestore(&priv->lock, flags);
417 /* If we asked for a speed change encode it */
418 if (baud_rate)
419 tty_encode_baud_rate(tty,
420 new_baudrate, new_baudrate);
421 }
422 break;
423 case CYPRESS_GET_CONFIG:
424 if (priv->get_cfg_unsafe) {
425 /* Not implemented for this device,
426 and if we try to do it we're likely
427 to crash the hardware. */
428 return -ENOTTY;
429 }
430 dbg("%s - retreiving serial line settings", __func__);
431 /* set initial values in feature buffer */
432 memset(feature_buffer, 0, sizeof(feature_buffer));
433
434 do {
435 retval = usb_control_msg(port->serial->dev,
436 usb_rcvctrlpipe(port->serial->dev, 0),
437 HID_REQ_GET_REPORT,
438 USB_DIR_IN | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
439 0x0300, 0, feature_buffer,
440 sizeof(feature_buffer), 500);
441
442 if (tries++ >= 3)
443 break;
444 } while (retval != sizeof(feature_buffer)
445 && retval != -ENODEV);
446
447 if (retval != sizeof(feature_buffer)) {
448 dev_err(&port->dev, "%s - failed to retrieve serial "
449 "line settings - %d\n", __func__, retval);
450 cypress_set_dead(port);
451 return retval;
452 } else {
453 spin_lock_irqsave(&priv->lock, flags);
454 /* store the config in one byte, and later
455 use bit masks to check values */
456 priv->current_config = feature_buffer[4];
457 priv->baud_rate = *((u_int32_t *)feature_buffer);
458 spin_unlock_irqrestore(&priv->lock, flags);
459 }
460 }
461 spin_lock_irqsave(&priv->lock, flags);
462 ++priv->cmd_count;
463 spin_unlock_irqrestore(&priv->lock, flags);
464
465 return retval;
466 } /* cypress_serial_control */
467
468
469 static void cypress_set_dead(struct usb_serial_port *port)
470 {
471 struct cypress_private *priv = usb_get_serial_port_data(port);
472 unsigned long flags;
473
474 spin_lock_irqsave(&priv->lock, flags);
475 if (!priv->comm_is_ok) {
476 spin_unlock_irqrestore(&priv->lock, flags);
477 return;
478 }
479 priv->comm_is_ok = 0;
480 spin_unlock_irqrestore(&priv->lock, flags);
481
482 dev_err(&port->dev, "cypress_m8 suspending failing port %d - "
483 "interval might be too short\n", port->number);
484 }
485
486
487 /*****************************************************************************
488 * Cypress serial driver functions
489 *****************************************************************************/
490
491
492 static int generic_startup(struct usb_serial *serial)
493 {
494 struct cypress_private *priv;
495 struct usb_serial_port *port = serial->port[0];
496
497 dbg("%s - port %d", __func__, port->number);
498
499 priv = kzalloc(sizeof(struct cypress_private), GFP_KERNEL);
500 if (!priv)
501 return -ENOMEM;
502
503 priv->comm_is_ok = !0;
504 spin_lock_init(&priv->lock);
505 priv->buf = cypress_buf_alloc(CYPRESS_BUF_SIZE);
506 if (priv->buf == NULL) {
507 kfree(priv);
508 return -ENOMEM;
509 }
510 init_waitqueue_head(&priv->delta_msr_wait);
511
512 usb_reset_configuration(serial->dev);
513
514 priv->cmd_ctrl = 0;
515 priv->line_control = 0;
516 priv->termios_initialized = 0;
517 priv->rx_flags = 0;
518 /* Default packet format setting is determined by packet size.
519 Anything with a size larger then 9 must have a separate
520 count field since the 3 bit count field is otherwise too
521 small. Otherwise we can use the slightly more compact
522 format. This is in accordance with the cypress_m8 serial
523 converter app note. */
524 if (port->interrupt_out_size > 9)
525 priv->pkt_fmt = packet_format_1;
526 else
527 priv->pkt_fmt = packet_format_2;
528
529 if (interval > 0) {
530 priv->write_urb_interval = interval;
531 priv->read_urb_interval = interval;
532 dbg("%s - port %d read & write intervals forced to %d",
533 __func__, port->number, interval);
534 } else {
535 priv->write_urb_interval = port->interrupt_out_urb->interval;
536 priv->read_urb_interval = port->interrupt_in_urb->interval;
537 dbg("%s - port %d intervals: read=%d write=%d",
538 __func__, port->number,
539 priv->read_urb_interval, priv->write_urb_interval);
540 }
541 usb_set_serial_port_data(port, priv);
542
543 return 0;
544 }
545
546
547 static int cypress_earthmate_startup(struct usb_serial *serial)
548 {
549 struct cypress_private *priv;
550 struct usb_serial_port *port = serial->port[0];
551
552 dbg("%s", __func__);
553
554 if (generic_startup(serial)) {
555 dbg("%s - Failed setting up port %d", __func__,
556 port->number);
557 return 1;
558 }
559
560 priv = usb_get_serial_port_data(port);
561 priv->chiptype = CT_EARTHMATE;
562 /* All Earthmate devices use the separated-count packet
563 format! Idiotic. */
564 priv->pkt_fmt = packet_format_1;
565 if (serial->dev->descriptor.idProduct !=
566 cpu_to_le16(PRODUCT_ID_EARTHMATEUSB)) {
567 /* The old original USB Earthmate seemed able to
568 handle GET_CONFIG requests; everything they've
569 produced since that time crashes if this command is
570 attempted :-( */
571 dbg("%s - Marking this device as unsafe for GET_CONFIG "
572 "commands", __func__);
573 priv->get_cfg_unsafe = !0;
574 }
575
576 return 0;
577 } /* cypress_earthmate_startup */
578
579
580 static int cypress_hidcom_startup(struct usb_serial *serial)
581 {
582 struct cypress_private *priv;
583
584 dbg("%s", __func__);
585
586 if (generic_startup(serial)) {
587 dbg("%s - Failed setting up port %d", __func__,
588 serial->port[0]->number);
589 return 1;
590 }
591
592 priv = usb_get_serial_port_data(serial->port[0]);
593 priv->chiptype = CT_CYPHIDCOM;
594
595 return 0;
596 } /* cypress_hidcom_startup */
597
598
599 static int cypress_ca42v2_startup(struct usb_serial *serial)
600 {
601 struct cypress_private *priv;
602
603 dbg("%s", __func__);
604
605 if (generic_startup(serial)) {
606 dbg("%s - Failed setting up port %d", __func__,
607 serial->port[0]->number);
608 return 1;
609 }
610
611 priv = usb_get_serial_port_data(serial->port[0]);
612 priv->chiptype = CT_CA42V2;
613
614 return 0;
615 } /* cypress_ca42v2_startup */
616
617
618 static void cypress_release(struct usb_serial *serial)
619 {
620 struct cypress_private *priv;
621
622 dbg("%s - port %d", __func__, serial->port[0]->number);
623
624 /* all open ports are closed at this point */
625
626 priv = usb_get_serial_port_data(serial->port[0]);
627
628 if (priv) {
629 cypress_buf_free(priv->buf);
630 kfree(priv);
631 }
632 }
633
634
635 static int cypress_open(struct tty_struct *tty, struct usb_serial_port *port)
636 {
637 struct cypress_private *priv = usb_get_serial_port_data(port);
638 struct usb_serial *serial = port->serial;
639 unsigned long flags;
640 int result = 0;
641
642 dbg("%s - port %d", __func__, port->number);
643
644 if (!priv->comm_is_ok)
645 return -EIO;
646
647 /* clear halts before open */
648 usb_clear_halt(serial->dev, 0x81);
649 usb_clear_halt(serial->dev, 0x02);
650
651 spin_lock_irqsave(&priv->lock, flags);
652 /* reset read/write statistics */
653 priv->bytes_in = 0;
654 priv->bytes_out = 0;
655 priv->cmd_count = 0;
656 priv->rx_flags = 0;
657 spin_unlock_irqrestore(&priv->lock, flags);
658
659 /* Set termios */
660 cypress_send(port);
661
662 if (tty)
663 cypress_set_termios(tty, port, &priv->tmp_termios);
664
665 /* setup the port and start reading from the device */
666 if (!port->interrupt_in_urb) {
667 dev_err(&port->dev, "%s - interrupt_in_urb is empty!\n",
668 __func__);
669 return -1;
670 }
671
672 usb_fill_int_urb(port->interrupt_in_urb, serial->dev,
673 usb_rcvintpipe(serial->dev, port->interrupt_in_endpointAddress),
674 port->interrupt_in_urb->transfer_buffer,
675 port->interrupt_in_urb->transfer_buffer_length,
676 cypress_read_int_callback, port, priv->read_urb_interval);
677 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
678
679 if (result) {
680 dev_err(&port->dev,
681 "%s - failed submitting read urb, error %d\n",
682 __func__, result);
683 cypress_set_dead(port);
684 }
685 port->port.drain_delay = 256;
686 return result;
687 } /* cypress_open */
688
689 static void cypress_dtr_rts(struct usb_serial_port *port, int on)
690 {
691 struct cypress_private *priv = usb_get_serial_port_data(port);
692 /* drop dtr and rts */
693 priv = usb_get_serial_port_data(port);
694 spin_lock_irq(&priv->lock);
695 if (on == 0)
696 priv->line_control = 0;
697 else
698 priv->line_control = CONTROL_DTR | CONTROL_RTS;
699 priv->cmd_ctrl = 1;
700 spin_unlock_irq(&priv->lock);
701 cypress_write(NULL, port, NULL, 0);
702 }
703
704 static void cypress_close(struct usb_serial_port *port)
705 {
706 struct cypress_private *priv = usb_get_serial_port_data(port);
707
708 dbg("%s - port %d", __func__, port->number);
709
710 /* writing is potentially harmful, lock must be taken */
711 mutex_lock(&port->serial->disc_mutex);
712 if (port->serial->disconnected) {
713 mutex_unlock(&port->serial->disc_mutex);
714 return;
715 }
716 cypress_buf_clear(priv->buf);
717 dbg("%s - stopping urbs", __func__);
718 usb_kill_urb(port->interrupt_in_urb);
719 usb_kill_urb(port->interrupt_out_urb);
720
721
722 if (stats)
723 dev_info(&port->dev, "Statistics: %d Bytes In | %d Bytes Out | %d Commands Issued\n",
724 priv->bytes_in, priv->bytes_out, priv->cmd_count);
725 mutex_unlock(&port->serial->disc_mutex);
726 } /* cypress_close */
727
728
729 static int cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
730 const unsigned char *buf, int count)
731 {
732 struct cypress_private *priv = usb_get_serial_port_data(port);
733 unsigned long flags;
734
735 dbg("%s - port %d, %d bytes", __func__, port->number, count);
736
737 /* line control commands, which need to be executed immediately,
738 are not put into the buffer for obvious reasons.
739 */
740 if (priv->cmd_ctrl) {
741 count = 0;
742 goto finish;
743 }
744
745 if (!count)
746 return count;
747
748 spin_lock_irqsave(&priv->lock, flags);
749 count = cypress_buf_put(priv->buf, buf, count);
750 spin_unlock_irqrestore(&priv->lock, flags);
751
752 finish:
753 cypress_send(port);
754
755 return count;
756 } /* cypress_write */
757
758
759 static void cypress_send(struct usb_serial_port *port)
760 {
761 int count = 0, result, offset, actual_size;
762 struct cypress_private *priv = usb_get_serial_port_data(port);
763 unsigned long flags;
764
765 if (!priv->comm_is_ok)
766 return;
767
768 dbg("%s - port %d", __func__, port->number);
769 dbg("%s - interrupt out size is %d", __func__,
770 port->interrupt_out_size);
771
772 spin_lock_irqsave(&priv->lock, flags);
773 if (priv->write_urb_in_use) {
774 dbg("%s - can't write, urb in use", __func__);
775 spin_unlock_irqrestore(&priv->lock, flags);
776 return;
777 }
778 spin_unlock_irqrestore(&priv->lock, flags);
779
780 /* clear buffer */
781 memset(port->interrupt_out_urb->transfer_buffer, 0,
782 port->interrupt_out_size);
783
784 spin_lock_irqsave(&priv->lock, flags);
785 switch (priv->pkt_fmt) {
786 default:
787 case packet_format_1:
788 /* this is for the CY7C64013... */
789 offset = 2;
790 port->interrupt_out_buffer[0] = priv->line_control;
791 break;
792 case packet_format_2:
793 /* this is for the CY7C63743... */
794 offset = 1;
795 port->interrupt_out_buffer[0] = priv->line_control;
796 break;
797 }
798
799 if (priv->line_control & CONTROL_RESET)
800 priv->line_control &= ~CONTROL_RESET;
801
802 if (priv->cmd_ctrl) {
803 priv->cmd_count++;
804 dbg("%s - line control command being issued", __func__);
805 spin_unlock_irqrestore(&priv->lock, flags);
806 goto send;
807 } else
808 spin_unlock_irqrestore(&priv->lock, flags);
809
810 count = cypress_buf_get(priv->buf, &port->interrupt_out_buffer[offset],
811 port->interrupt_out_size-offset);
812
813 if (count == 0)
814 return;
815
816 switch (priv->pkt_fmt) {
817 default:
818 case packet_format_1:
819 port->interrupt_out_buffer[1] = count;
820 break;
821 case packet_format_2:
822 port->interrupt_out_buffer[0] |= count;
823 }
824
825 dbg("%s - count is %d", __func__, count);
826
827 send:
828 spin_lock_irqsave(&priv->lock, flags);
829 priv->write_urb_in_use = 1;
830 spin_unlock_irqrestore(&priv->lock, flags);
831
832 if (priv->cmd_ctrl)
833 actual_size = 1;
834 else
835 actual_size = count +
836 (priv->pkt_fmt == packet_format_1 ? 2 : 1);
837
838 usb_serial_debug_data(debug, &port->dev, __func__,
839 port->interrupt_out_size,
840 port->interrupt_out_urb->transfer_buffer);
841
842 usb_fill_int_urb(port->interrupt_out_urb, port->serial->dev,
843 usb_sndintpipe(port->serial->dev, port->interrupt_out_endpointAddress),
844 port->interrupt_out_buffer, port->interrupt_out_size,
845 cypress_write_int_callback, port, priv->write_urb_interval);
846 result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC);
847 if (result) {
848 dev_err(&port->dev,
849 "%s - failed submitting write urb, error %d\n",
850 __func__, result);
851 priv->write_urb_in_use = 0;
852 cypress_set_dead(port);
853 }
854
855 spin_lock_irqsave(&priv->lock, flags);
856 if (priv->cmd_ctrl)
857 priv->cmd_ctrl = 0;
858
859 /* do not count the line control and size bytes */
860 priv->bytes_out += count;
861 spin_unlock_irqrestore(&priv->lock, flags);
862
863 usb_serial_port_softint(port);
864 } /* cypress_send */
865
866
867 /* returns how much space is available in the soft buffer */
868 static int cypress_write_room(struct tty_struct *tty)
869 {
870 struct usb_serial_port *port = tty->driver_data;
871 struct cypress_private *priv = usb_get_serial_port_data(port);
872 int room = 0;
873 unsigned long flags;
874
875 dbg("%s - port %d", __func__, port->number);
876
877 spin_lock_irqsave(&priv->lock, flags);
878 room = cypress_buf_space_avail(priv->buf);
879 spin_unlock_irqrestore(&priv->lock, flags);
880
881 dbg("%s - returns %d", __func__, room);
882 return room;
883 }
884
885
886 static int cypress_tiocmget(struct tty_struct *tty, struct file *file)
887 {
888 struct usb_serial_port *port = tty->driver_data;
889 struct cypress_private *priv = usb_get_serial_port_data(port);
890 __u8 status, control;
891 unsigned int result = 0;
892 unsigned long flags;
893
894 dbg("%s - port %d", __func__, port->number);
895
896 spin_lock_irqsave(&priv->lock, flags);
897 control = priv->line_control;
898 status = priv->current_status;
899 spin_unlock_irqrestore(&priv->lock, flags);
900
901 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
902 | ((control & CONTROL_RTS) ? TIOCM_RTS : 0)
903 | ((status & UART_CTS) ? TIOCM_CTS : 0)
904 | ((status & UART_DSR) ? TIOCM_DSR : 0)
905 | ((status & UART_RI) ? TIOCM_RI : 0)
906 | ((status & UART_CD) ? TIOCM_CD : 0);
907
908 dbg("%s - result = %x", __func__, result);
909
910 return result;
911 }
912
913
914 static int cypress_tiocmset(struct tty_struct *tty, struct file *file,
915 unsigned int set, unsigned int clear)
916 {
917 struct usb_serial_port *port = tty->driver_data;
918 struct cypress_private *priv = usb_get_serial_port_data(port);
919 unsigned long flags;
920
921 dbg("%s - port %d", __func__, port->number);
922
923 spin_lock_irqsave(&priv->lock, flags);
924 if (set & TIOCM_RTS)
925 priv->line_control |= CONTROL_RTS;
926 if (set & TIOCM_DTR)
927 priv->line_control |= CONTROL_DTR;
928 if (clear & TIOCM_RTS)
929 priv->line_control &= ~CONTROL_RTS;
930 if (clear & TIOCM_DTR)
931 priv->line_control &= ~CONTROL_DTR;
932 priv->cmd_ctrl = 1;
933 spin_unlock_irqrestore(&priv->lock, flags);
934
935 return cypress_write(tty, port, NULL, 0);
936 }
937
938
939 static int cypress_ioctl(struct tty_struct *tty, struct file *file,
940 unsigned int cmd, unsigned long arg)
941 {
942 struct usb_serial_port *port = tty->driver_data;
943 struct cypress_private *priv = usb_get_serial_port_data(port);
944
945 dbg("%s - port %d, cmd 0x%.4x", __func__, port->number, cmd);
946
947 switch (cmd) {
948 /* This code comes from drivers/char/serial.c and ftdi_sio.c */
949 case TIOCMIWAIT:
950 while (priv != NULL) {
951 interruptible_sleep_on(&priv->delta_msr_wait);
952 /* see if a signal did it */
953 if (signal_pending(current))
954 return -ERESTARTSYS;
955 else {
956 char diff = priv->diff_status;
957 if (diff == 0)
958 return -EIO; /* no change => error */
959
960 /* consume all events */
961 priv->diff_status = 0;
962
963 /* return 0 if caller wanted to know about
964 these bits */
965 if (((arg & TIOCM_RNG) && (diff & UART_RI)) ||
966 ((arg & TIOCM_DSR) && (diff & UART_DSR)) ||
967 ((arg & TIOCM_CD) && (diff & UART_CD)) ||
968 ((arg & TIOCM_CTS) && (diff & UART_CTS)))
969 return 0;
970 /* otherwise caller can't care less about what
971 * happened, and so we continue to wait for
972 * more events.
973 */
974 }
975 }
976 return 0;
977 default:
978 break;
979 }
980 dbg("%s - arg not supported - it was 0x%04x - check include/asm/ioctls.h", __func__, cmd);
981 return -ENOIOCTLCMD;
982 } /* cypress_ioctl */
983
984
985 static void cypress_set_termios(struct tty_struct *tty,
986 struct usb_serial_port *port, struct ktermios *old_termios)
987 {
988 struct cypress_private *priv = usb_get_serial_port_data(port);
989 int data_bits, stop_bits, parity_type, parity_enable;
990 unsigned cflag, iflag;
991 unsigned long flags;
992 __u8 oldlines;
993 int linechange = 0;
994
995 dbg("%s - port %d", __func__, port->number);
996
997 spin_lock_irqsave(&priv->lock, flags);
998 /* We can't clean this one up as we don't know the device type
999 early enough */
1000 if (!priv->termios_initialized) {
1001 if (priv->chiptype == CT_EARTHMATE) {
1002 *(tty->termios) = tty_std_termios;
1003 tty->termios->c_cflag = B4800 | CS8 | CREAD | HUPCL |
1004 CLOCAL;
1005 tty->termios->c_ispeed = 4800;
1006 tty->termios->c_ospeed = 4800;
1007 } else if (priv->chiptype == CT_CYPHIDCOM) {
1008 *(tty->termios) = tty_std_termios;
1009 tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL |
1010 CLOCAL;
1011 tty->termios->c_ispeed = 9600;
1012 tty->termios->c_ospeed = 9600;
1013 } else if (priv->chiptype == CT_CA42V2) {
1014 *(tty->termios) = tty_std_termios;
1015 tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL |
1016 CLOCAL;
1017 tty->termios->c_ispeed = 9600;
1018 tty->termios->c_ospeed = 9600;
1019 }
1020 priv->termios_initialized = 1;
1021 }
1022 spin_unlock_irqrestore(&priv->lock, flags);
1023
1024 /* Unsupported features need clearing */
1025 tty->termios->c_cflag &= ~(CMSPAR|CRTSCTS);
1026
1027 cflag = tty->termios->c_cflag;
1028 iflag = tty->termios->c_iflag;
1029
1030 /* check if there are new settings */
1031 if (old_termios) {
1032 spin_lock_irqsave(&priv->lock, flags);
1033 priv->tmp_termios = *(tty->termios);
1034 spin_unlock_irqrestore(&priv->lock, flags);
1035 }
1036
1037 /* set number of data bits, parity, stop bits */
1038 /* when parity is disabled the parity type bit is ignored */
1039
1040 /* 1 means 2 stop bits, 0 means 1 stop bit */
1041 stop_bits = cflag & CSTOPB ? 1 : 0;
1042
1043 if (cflag & PARENB) {
1044 parity_enable = 1;
1045 /* 1 means odd parity, 0 means even parity */
1046 parity_type = cflag & PARODD ? 1 : 0;
1047 } else
1048 parity_enable = parity_type = 0;
1049
1050 switch (cflag & CSIZE) {
1051 case CS5:
1052 data_bits = 0;
1053 break;
1054 case CS6:
1055 data_bits = 1;
1056 break;
1057 case CS7:
1058 data_bits = 2;
1059 break;
1060 case CS8:
1061 data_bits = 3;
1062 break;
1063 default:
1064 dev_err(&port->dev, "%s - CSIZE was set, but not CS5-CS8\n",
1065 __func__);
1066 data_bits = 3;
1067 }
1068 spin_lock_irqsave(&priv->lock, flags);
1069 oldlines = priv->line_control;
1070 if ((cflag & CBAUD) == B0) {
1071 /* drop dtr and rts */
1072 dbg("%s - dropping the lines, baud rate 0bps", __func__);
1073 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
1074 } else
1075 priv->line_control = (CONTROL_DTR | CONTROL_RTS);
1076 spin_unlock_irqrestore(&priv->lock, flags);
1077
1078 dbg("%s - sending %d stop_bits, %d parity_enable, %d parity_type, "
1079 "%d data_bits (+5)", __func__, stop_bits,
1080 parity_enable, parity_type, data_bits);
1081
1082 cypress_serial_control(tty, port, tty_get_baud_rate(tty),
1083 data_bits, stop_bits,
1084 parity_enable, parity_type,
1085 0, CYPRESS_SET_CONFIG);
1086
1087 /* we perform a CYPRESS_GET_CONFIG so that the current settings are
1088 * filled into the private structure this should confirm that all is
1089 * working if it returns what we just set */
1090 cypress_serial_control(tty, port, 0, 0, 0, 0, 0, 0, CYPRESS_GET_CONFIG);
1091
1092 /* Here we can define custom tty settings for devices; the main tty
1093 * termios flag base comes from empeg.c */
1094
1095 spin_lock_irqsave(&priv->lock, flags);
1096 if (priv->chiptype == CT_EARTHMATE && priv->baud_rate == 4800) {
1097 dbg("Using custom termios settings for a baud rate of "
1098 "4800bps.");
1099 /* define custom termios settings for NMEA protocol */
1100
1101 tty->termios->c_iflag /* input modes - */
1102 &= ~(IGNBRK /* disable ignore break */
1103 | BRKINT /* disable break causes interrupt */
1104 | PARMRK /* disable mark parity errors */
1105 | ISTRIP /* disable clear high bit of input char */
1106 | INLCR /* disable translate NL to CR */
1107 | IGNCR /* disable ignore CR */
1108 | ICRNL /* disable translate CR to NL */
1109 | IXON); /* disable enable XON/XOFF flow control */
1110
1111 tty->termios->c_oflag /* output modes */
1112 &= ~OPOST; /* disable postprocess output char */
1113
1114 tty->termios->c_lflag /* line discipline modes */
1115 &= ~(ECHO /* disable echo input characters */
1116 | ECHONL /* disable echo new line */
1117 | ICANON /* disable erase, kill, werase, and rprnt
1118 special characters */
1119 | ISIG /* disable interrupt, quit, and suspend
1120 special characters */
1121 | IEXTEN); /* disable non-POSIX special characters */
1122 } /* CT_CYPHIDCOM: Application should handle this for device */
1123
1124 linechange = (priv->line_control != oldlines);
1125 spin_unlock_irqrestore(&priv->lock, flags);
1126
1127 /* if necessary, set lines */
1128 if (linechange) {
1129 priv->cmd_ctrl = 1;
1130 cypress_write(tty, port, NULL, 0);
1131 }
1132 } /* cypress_set_termios */
1133
1134
1135 /* returns amount of data still left in soft buffer */
1136 static int cypress_chars_in_buffer(struct tty_struct *tty)
1137 {
1138 struct usb_serial_port *port = tty->driver_data;
1139 struct cypress_private *priv = usb_get_serial_port_data(port);
1140 int chars = 0;
1141 unsigned long flags;
1142
1143 dbg("%s - port %d", __func__, port->number);
1144
1145 spin_lock_irqsave(&priv->lock, flags);
1146 chars = cypress_buf_data_avail(priv->buf);
1147 spin_unlock_irqrestore(&priv->lock, flags);
1148
1149 dbg("%s - returns %d", __func__, chars);
1150 return chars;
1151 }
1152
1153
1154 static void cypress_throttle(struct tty_struct *tty)
1155 {
1156 struct usb_serial_port *port = tty->driver_data;
1157 struct cypress_private *priv = usb_get_serial_port_data(port);
1158
1159 dbg("%s - port %d", __func__, port->number);
1160
1161 spin_lock_irq(&priv->lock);
1162 priv->rx_flags = THROTTLED;
1163 spin_unlock_irq(&priv->lock);
1164 }
1165
1166
1167 static void cypress_unthrottle(struct tty_struct *tty)
1168 {
1169 struct usb_serial_port *port = tty->driver_data;
1170 struct cypress_private *priv = usb_get_serial_port_data(port);
1171 int actually_throttled, result;
1172
1173 dbg("%s - port %d", __func__, port->number);
1174
1175 spin_lock_irq(&priv->lock);
1176 actually_throttled = priv->rx_flags & ACTUALLY_THROTTLED;
1177 priv->rx_flags = 0;
1178 spin_unlock_irq(&priv->lock);
1179
1180 if (!priv->comm_is_ok)
1181 return;
1182
1183 if (actually_throttled) {
1184 port->interrupt_in_urb->dev = port->serial->dev;
1185
1186 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
1187 if (result) {
1188 dev_err(&port->dev, "%s - failed submitting read urb, "
1189 "error %d\n", __func__, result);
1190 cypress_set_dead(port);
1191 }
1192 }
1193 }
1194
1195
1196 static void cypress_read_int_callback(struct urb *urb)
1197 {
1198 struct usb_serial_port *port = urb->context;
1199 struct cypress_private *priv = usb_get_serial_port_data(port);
1200 struct tty_struct *tty;
1201 unsigned char *data = urb->transfer_buffer;
1202 unsigned long flags;
1203 char tty_flag = TTY_NORMAL;
1204 int havedata = 0;
1205 int bytes = 0;
1206 int result;
1207 int i = 0;
1208 int status = urb->status;
1209
1210 dbg("%s - port %d", __func__, port->number);
1211
1212 switch (status) {
1213 case 0: /* success */
1214 break;
1215 case -ECONNRESET:
1216 case -ENOENT:
1217 case -ESHUTDOWN:
1218 /* precursor to disconnect so just go away */
1219 return;
1220 case -EPIPE:
1221 /* Can't call usb_clear_halt while in_interrupt */
1222 /* FALLS THROUGH */
1223 default:
1224 /* something ugly is going on... */
1225 dev_err(&urb->dev->dev,
1226 "%s - unexpected nonzero read status received: %d\n",
1227 __func__, status);
1228 cypress_set_dead(port);
1229 return;
1230 }
1231
1232 spin_lock_irqsave(&priv->lock, flags);
1233 if (priv->rx_flags & THROTTLED) {
1234 dbg("%s - now throttling", __func__);
1235 priv->rx_flags |= ACTUALLY_THROTTLED;
1236 spin_unlock_irqrestore(&priv->lock, flags);
1237 return;
1238 }
1239 spin_unlock_irqrestore(&priv->lock, flags);
1240
1241 tty = tty_port_tty_get(&port->port);
1242 if (!tty) {
1243 dbg("%s - bad tty pointer - exiting", __func__);
1244 return;
1245 }
1246
1247 spin_lock_irqsave(&priv->lock, flags);
1248 result = urb->actual_length;
1249 switch (priv->pkt_fmt) {
1250 default:
1251 case packet_format_1:
1252 /* This is for the CY7C64013... */
1253 priv->current_status = data[0] & 0xF8;
1254 bytes = data[1] + 2;
1255 i = 2;
1256 if (bytes > 2)
1257 havedata = 1;
1258 break;
1259 case packet_format_2:
1260 /* This is for the CY7C63743... */
1261 priv->current_status = data[0] & 0xF8;
1262 bytes = (data[0] & 0x07) + 1;
1263 i = 1;
1264 if (bytes > 1)
1265 havedata = 1;
1266 break;
1267 }
1268 spin_unlock_irqrestore(&priv->lock, flags);
1269 if (result < bytes) {
1270 dbg("%s - wrong packet size - received %d bytes but packet "
1271 "said %d bytes", __func__, result, bytes);
1272 goto continue_read;
1273 }
1274
1275 usb_serial_debug_data(debug, &port->dev, __func__,
1276 urb->actual_length, data);
1277
1278 spin_lock_irqsave(&priv->lock, flags);
1279 /* check to see if status has changed */
1280 if (priv->current_status != priv->prev_status) {
1281 priv->diff_status |= priv->current_status ^
1282 priv->prev_status;
1283 wake_up_interruptible(&priv->delta_msr_wait);
1284 priv->prev_status = priv->current_status;
1285 }
1286 spin_unlock_irqrestore(&priv->lock, flags);
1287
1288 /* hangup, as defined in acm.c... this might be a bad place for it
1289 * though */
1290 if (tty && !(tty->termios->c_cflag & CLOCAL) &&
1291 !(priv->current_status & UART_CD)) {
1292 dbg("%s - calling hangup", __func__);
1293 tty_hangup(tty);
1294 goto continue_read;
1295 }
1296
1297 /* There is one error bit... I'm assuming it is a parity error
1298 * indicator as the generic firmware will set this bit to 1 if a
1299 * parity error occurs.
1300 * I can not find reference to any other error events. */
1301 spin_lock_irqsave(&priv->lock, flags);
1302 if (priv->current_status & CYP_ERROR) {
1303 spin_unlock_irqrestore(&priv->lock, flags);
1304 tty_flag = TTY_PARITY;
1305 dbg("%s - Parity Error detected", __func__);
1306 } else
1307 spin_unlock_irqrestore(&priv->lock, flags);
1308
1309 /* process read if there is data other than line status */
1310 if (tty && (bytes > i)) {
1311 bytes = tty_buffer_request_room(tty, bytes);
1312 for (; i < bytes ; ++i) {
1313 dbg("pushing byte number %d - %d - %c", i, data[i],
1314 data[i]);
1315 tty_insert_flip_char(tty, data[i], tty_flag);
1316 }
1317 tty_flip_buffer_push(tty);
1318 }
1319
1320 spin_lock_irqsave(&priv->lock, flags);
1321 /* control and status byte(s) are also counted */
1322 priv->bytes_in += bytes;
1323 spin_unlock_irqrestore(&priv->lock, flags);
1324
1325 continue_read:
1326 tty_kref_put(tty);
1327
1328 /* Continue trying to always read... unless the port has closed. */
1329
1330 if (port->port.count > 0 && priv->comm_is_ok) {
1331 usb_fill_int_urb(port->interrupt_in_urb, port->serial->dev,
1332 usb_rcvintpipe(port->serial->dev,
1333 port->interrupt_in_endpointAddress),
1334 port->interrupt_in_urb->transfer_buffer,
1335 port->interrupt_in_urb->transfer_buffer_length,
1336 cypress_read_int_callback, port,
1337 priv->read_urb_interval);
1338 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
1339 if (result) {
1340 dev_err(&urb->dev->dev, "%s - failed resubmitting "
1341 "read urb, error %d\n", __func__,
1342 result);
1343 cypress_set_dead(port);
1344 }
1345 }
1346
1347 return;
1348 } /* cypress_read_int_callback */
1349
1350
1351 static void cypress_write_int_callback(struct urb *urb)
1352 {
1353 struct usb_serial_port *port = urb->context;
1354 struct cypress_private *priv = usb_get_serial_port_data(port);
1355 int result;
1356 int status = urb->status;
1357
1358 dbg("%s - port %d", __func__, port->number);
1359
1360 switch (status) {
1361 case 0:
1362 /* success */
1363 break;
1364 case -ECONNRESET:
1365 case -ENOENT:
1366 case -ESHUTDOWN:
1367 /* this urb is terminated, clean up */
1368 dbg("%s - urb shutting down with status: %d",
1369 __func__, status);
1370 priv->write_urb_in_use = 0;
1371 return;
1372 case -EPIPE: /* no break needed; clear halt and resubmit */
1373 if (!priv->comm_is_ok)
1374 break;
1375 usb_clear_halt(port->serial->dev, 0x02);
1376 /* error in the urb, so we have to resubmit it */
1377 dbg("%s - nonzero write bulk status received: %d",
1378 __func__, status);
1379 port->interrupt_out_urb->transfer_buffer_length = 1;
1380 port->interrupt_out_urb->dev = port->serial->dev;
1381 result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC);
1382 if (!result)
1383 return;
1384 dev_err(&urb->dev->dev,
1385 "%s - failed resubmitting write urb, error %d\n",
1386 __func__, result);
1387 cypress_set_dead(port);
1388 break;
1389 default:
1390 dev_err(&urb->dev->dev,
1391 "%s - unexpected nonzero write status received: %d\n",
1392 __func__, status);
1393 cypress_set_dead(port);
1394 break;
1395 }
1396 priv->write_urb_in_use = 0;
1397
1398 /* send any buffered data */
1399 cypress_send(port);
1400 }
1401
1402
1403 /*****************************************************************************
1404 * Write buffer functions - buffering code from pl2303 used
1405 *****************************************************************************/
1406
1407 /*
1408 * cypress_buf_alloc
1409 *
1410 * Allocate a circular buffer and all associated memory.
1411 */
1412
1413 static struct cypress_buf *cypress_buf_alloc(unsigned int size)
1414 {
1415
1416 struct cypress_buf *cb;
1417
1418
1419 if (size == 0)
1420 return NULL;
1421
1422 cb = kmalloc(sizeof(struct cypress_buf), GFP_KERNEL);
1423 if (cb == NULL)
1424 return NULL;
1425
1426 cb->buf_buf = kmalloc(size, GFP_KERNEL);
1427 if (cb->buf_buf == NULL) {
1428 kfree(cb);
1429 return NULL;
1430 }
1431
1432 cb->buf_size = size;
1433 cb->buf_get = cb->buf_put = cb->buf_buf;
1434
1435 return cb;
1436
1437 }
1438
1439
1440 /*
1441 * cypress_buf_free
1442 *
1443 * Free the buffer and all associated memory.
1444 */
1445
1446 static void cypress_buf_free(struct cypress_buf *cb)
1447 {
1448 if (cb) {
1449 kfree(cb->buf_buf);
1450 kfree(cb);
1451 }
1452 }
1453
1454
1455 /*
1456 * cypress_buf_clear
1457 *
1458 * Clear out all data in the circular buffer.
1459 */
1460
1461 static void cypress_buf_clear(struct cypress_buf *cb)
1462 {
1463 if (cb != NULL)
1464 cb->buf_get = cb->buf_put;
1465 /* equivalent to a get of all data available */
1466 }
1467
1468
1469 /*
1470 * cypress_buf_data_avail
1471 *
1472 * Return the number of bytes of data available in the circular
1473 * buffer.
1474 */
1475
1476 static unsigned int cypress_buf_data_avail(struct cypress_buf *cb)
1477 {
1478 if (cb != NULL)
1479 return (cb->buf_size + cb->buf_put - cb->buf_get)
1480 % cb->buf_size;
1481 else
1482 return 0;
1483 }
1484
1485
1486 /*
1487 * cypress_buf_space_avail
1488 *
1489 * Return the number of bytes of space available in the circular
1490 * buffer.
1491 */
1492
1493 static unsigned int cypress_buf_space_avail(struct cypress_buf *cb)
1494 {
1495 if (cb != NULL)
1496 return (cb->buf_size + cb->buf_get - cb->buf_put - 1)
1497 % cb->buf_size;
1498 else
1499 return 0;
1500 }
1501
1502
1503 /*
1504 * cypress_buf_put
1505 *
1506 * Copy data data from a user buffer and put it into the circular buffer.
1507 * Restrict to the amount of space available.
1508 *
1509 * Return the number of bytes copied.
1510 */
1511
1512 static unsigned int cypress_buf_put(struct cypress_buf *cb, const char *buf,
1513 unsigned int count)
1514 {
1515
1516 unsigned int len;
1517
1518
1519 if (cb == NULL)
1520 return 0;
1521
1522 len = cypress_buf_space_avail(cb);
1523 if (count > len)
1524 count = len;
1525
1526 if (count == 0)
1527 return 0;
1528
1529 len = cb->buf_buf + cb->buf_size - cb->buf_put;
1530 if (count > len) {
1531 memcpy(cb->buf_put, buf, len);
1532 memcpy(cb->buf_buf, buf+len, count - len);
1533 cb->buf_put = cb->buf_buf + count - len;
1534 } else {
1535 memcpy(cb->buf_put, buf, count);
1536 if (count < len)
1537 cb->buf_put += count;
1538 else /* count == len */
1539 cb->buf_put = cb->buf_buf;
1540 }
1541
1542 return count;
1543
1544 }
1545
1546
1547 /*
1548 * cypress_buf_get
1549 *
1550 * Get data from the circular buffer and copy to the given buffer.
1551 * Restrict to the amount of data available.
1552 *
1553 * Return the number of bytes copied.
1554 */
1555
1556 static unsigned int cypress_buf_get(struct cypress_buf *cb, char *buf,
1557 unsigned int count)
1558 {
1559
1560 unsigned int len;
1561
1562
1563 if (cb == NULL)
1564 return 0;
1565
1566 len = cypress_buf_data_avail(cb);
1567 if (count > len)
1568 count = len;
1569
1570 if (count == 0)
1571 return 0;
1572
1573 len = cb->buf_buf + cb->buf_size - cb->buf_get;
1574 if (count > len) {
1575 memcpy(buf, cb->buf_get, len);
1576 memcpy(buf+len, cb->buf_buf, count - len);
1577 cb->buf_get = cb->buf_buf + count - len;
1578 } else {
1579 memcpy(buf, cb->buf_get, count);
1580 if (count < len)
1581 cb->buf_get += count;
1582 else /* count == len */
1583 cb->buf_get = cb->buf_buf;
1584 }
1585
1586 return count;
1587
1588 }
1589
1590 /*****************************************************************************
1591 * Module functions
1592 *****************************************************************************/
1593
1594 static int __init cypress_init(void)
1595 {
1596 int retval;
1597
1598 dbg("%s", __func__);
1599
1600 retval = usb_serial_register(&cypress_earthmate_device);
1601 if (retval)
1602 goto failed_em_register;
1603 retval = usb_serial_register(&cypress_hidcom_device);
1604 if (retval)
1605 goto failed_hidcom_register;
1606 retval = usb_serial_register(&cypress_ca42v2_device);
1607 if (retval)
1608 goto failed_ca42v2_register;
1609 retval = usb_register(&cypress_driver);
1610 if (retval)
1611 goto failed_usb_register;
1612
1613 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
1614 DRIVER_DESC "\n");
1615 return 0;
1616
1617 failed_usb_register:
1618 usb_serial_deregister(&cypress_ca42v2_device);
1619 failed_ca42v2_register:
1620 usb_serial_deregister(&cypress_hidcom_device);
1621 failed_hidcom_register:
1622 usb_serial_deregister(&cypress_earthmate_device);
1623 failed_em_register:
1624 return retval;
1625 }
1626
1627
1628 static void __exit cypress_exit(void)
1629 {
1630 dbg("%s", __func__);
1631
1632 usb_deregister(&cypress_driver);
1633 usb_serial_deregister(&cypress_earthmate_device);
1634 usb_serial_deregister(&cypress_hidcom_device);
1635 usb_serial_deregister(&cypress_ca42v2_device);
1636 }
1637
1638
1639 module_init(cypress_init);
1640 module_exit(cypress_exit);
1641
1642 MODULE_AUTHOR(DRIVER_AUTHOR);
1643 MODULE_DESCRIPTION(DRIVER_DESC);
1644 MODULE_VERSION(DRIVER_VERSION);
1645 MODULE_LICENSE("GPL");
1646
1647 module_param(debug, bool, S_IRUGO | S_IWUSR);
1648 MODULE_PARM_DESC(debug, "Debug enabled or not");
1649 module_param(stats, bool, S_IRUGO | S_IWUSR);
1650 MODULE_PARM_DESC(stats, "Enable statistics or not");
1651 module_param(interval, int, S_IRUGO | S_IWUSR);
1652 MODULE_PARM_DESC(interval, "Overrides interrupt interval");
Linux for Ginger Game Console