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lib: lz4: cleanup unaligned access efficiency detection
[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
15 * driver
16 *
17 * See http://geocities.com/i0xox0i for information on this driver and the
18 * earthmate usb device.
19 */
20
21 /* Thanks to Neil Whelchel for writing the first cypress m8 implementation
22 for linux. */
23 /* Thanks to cypress for providing references for the hid reports. */
24 /* Thanks to Jiang Zhang for providing links and for general help. */
25 /* Code originates and was built up from ftdi_sio, belkin, pl2303 and others.*/
26
27
28 #include <linux/kernel.h>
29 #include <linux/errno.h>
30 #include <linux/slab.h>
31 #include <linux/tty.h>
32 #include <linux/tty_driver.h>
33 #include <linux/tty_flip.h>
34 #include <linux/module.h>
35 #include <linux/moduleparam.h>
36 #include <linux/spinlock.h>
37 #include <linux/usb.h>
38 #include <linux/usb/serial.h>
39 #include <linux/serial.h>
40 #include <linux/kfifo.h>
41 #include <linux/delay.h>
42 #include <linux/uaccess.h>
43 #include <asm/unaligned.h>
44
45 #include "cypress_m8.h"
46
47
48 static bool stats;
49 static int interval;
50 static bool unstable_bauds;
51
52 #define DRIVER_AUTHOR "Lonnie Mendez <dignome@gmail.com>, Neil Whelchel <koyama@firstlight.net>"
53 #define DRIVER_DESC "Cypress USB to Serial Driver"
54
55 /* write buffer size defines */
56 #define CYPRESS_BUF_SIZE 1024
57
58 static const struct usb_device_id id_table_earthmate[] = {
59 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
60 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
61 { } /* Terminating entry */
62 };
63
64 static const struct usb_device_id id_table_cyphidcomrs232[] = {
65 { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
66 { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) },
67 { USB_DEVICE(VENDOR_ID_FRWD, PRODUCT_ID_CYPHIDCOM_FRWD) },
68 { } /* Terminating entry */
69 };
70
71 static const struct usb_device_id id_table_nokiaca42v2[] = {
72 { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
73 { } /* Terminating entry */
74 };
75
76 static const struct usb_device_id id_table_combined[] = {
77 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
78 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
79 { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
80 { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) },
81 { USB_DEVICE(VENDOR_ID_FRWD, PRODUCT_ID_CYPHIDCOM_FRWD) },
82 { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
83 { } /* Terminating entry */
84 };
85
86 MODULE_DEVICE_TABLE(usb, id_table_combined);
87
88 enum packet_format {
89 packet_format_1, /* b0:status, b1:payload count */
90 packet_format_2 /* b0[7:3]:status, b0[2:0]:payload count */
91 };
92
93 struct cypress_private {
94 spinlock_t lock; /* private lock */
95 int chiptype; /* identifier of device, for quirks/etc */
96 int bytes_in; /* used for statistics */
97 int bytes_out; /* used for statistics */
98 int cmd_count; /* used for statistics */
99 int cmd_ctrl; /* always set this to 1 before issuing a command */
100 struct kfifo write_fifo; /* write fifo */
101 int write_urb_in_use; /* write urb in use indicator */
102 int write_urb_interval; /* interval to use for write urb */
103 int read_urb_interval; /* interval to use for read urb */
104 int comm_is_ok; /* true if communication is (still) ok */
105 int termios_initialized;
106 __u8 line_control; /* holds dtr / rts value */
107 __u8 current_status; /* received from last read - info on dsr,cts,cd,ri,etc */
108 __u8 current_config; /* stores the current configuration byte */
109 __u8 rx_flags; /* throttling - used from whiteheat/ftdi_sio */
110 enum packet_format pkt_fmt; /* format to use for packet send / receive */
111 int get_cfg_unsafe; /* If true, the CYPRESS_GET_CONFIG is unsafe */
112 int baud_rate; /* stores current baud rate in
113 integer form */
114 int isthrottled; /* if throttled, discard reads */
115 char prev_status; /* used for TIOCMIWAIT */
116 /* we pass a pointer to this as the argument sent to
117 cypress_set_termios old_termios */
118 struct ktermios tmp_termios; /* stores the old termios settings */
119 };
120
121 /* function prototypes for the Cypress USB to serial device */
122 static int cypress_earthmate_port_probe(struct usb_serial_port *port);
123 static int cypress_hidcom_port_probe(struct usb_serial_port *port);
124 static int cypress_ca42v2_port_probe(struct usb_serial_port *port);
125 static int cypress_port_remove(struct usb_serial_port *port);
126 static int cypress_open(struct tty_struct *tty, struct usb_serial_port *port);
127 static void cypress_close(struct usb_serial_port *port);
128 static void cypress_dtr_rts(struct usb_serial_port *port, int on);
129 static int cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
130 const unsigned char *buf, int count);
131 static void cypress_send(struct usb_serial_port *port);
132 static int cypress_write_room(struct tty_struct *tty);
133 static void cypress_set_termios(struct tty_struct *tty,
134 struct usb_serial_port *port, struct ktermios *old);
135 static int cypress_tiocmget(struct tty_struct *tty);
136 static int cypress_tiocmset(struct tty_struct *tty,
137 unsigned int set, unsigned int clear);
138 static int cypress_chars_in_buffer(struct tty_struct *tty);
139 static void cypress_throttle(struct tty_struct *tty);
140 static void cypress_unthrottle(struct tty_struct *tty);
141 static void cypress_set_dead(struct usb_serial_port *port);
142 static void cypress_read_int_callback(struct urb *urb);
143 static void cypress_write_int_callback(struct urb *urb);
144
145 static struct usb_serial_driver cypress_earthmate_device = {
146 .driver = {
147 .owner = THIS_MODULE,
148 .name = "earthmate",
149 },
150 .description = "DeLorme Earthmate USB",
151 .id_table = id_table_earthmate,
152 .num_ports = 1,
153 .port_probe = cypress_earthmate_port_probe,
154 .port_remove = cypress_port_remove,
155 .open = cypress_open,
156 .close = cypress_close,
157 .dtr_rts = cypress_dtr_rts,
158 .write = cypress_write,
159 .write_room = cypress_write_room,
160 .set_termios = cypress_set_termios,
161 .tiocmget = cypress_tiocmget,
162 .tiocmset = cypress_tiocmset,
163 .tiocmiwait = usb_serial_generic_tiocmiwait,
164 .chars_in_buffer = cypress_chars_in_buffer,
165 .throttle = cypress_throttle,
166 .unthrottle = cypress_unthrottle,
167 .read_int_callback = cypress_read_int_callback,
168 .write_int_callback = cypress_write_int_callback,
169 };
170
171 static struct usb_serial_driver cypress_hidcom_device = {
172 .driver = {
173 .owner = THIS_MODULE,
174 .name = "cyphidcom",
175 },
176 .description = "HID->COM RS232 Adapter",
177 .id_table = id_table_cyphidcomrs232,
178 .num_ports = 1,
179 .port_probe = cypress_hidcom_port_probe,
180 .port_remove = cypress_port_remove,
181 .open = cypress_open,
182 .close = cypress_close,
183 .dtr_rts = cypress_dtr_rts,
184 .write = cypress_write,
185 .write_room = cypress_write_room,
186 .set_termios = cypress_set_termios,
187 .tiocmget = cypress_tiocmget,
188 .tiocmset = cypress_tiocmset,
189 .tiocmiwait = usb_serial_generic_tiocmiwait,
190 .chars_in_buffer = cypress_chars_in_buffer,
191 .throttle = cypress_throttle,
192 .unthrottle = cypress_unthrottle,
193 .read_int_callback = cypress_read_int_callback,
194 .write_int_callback = cypress_write_int_callback,
195 };
196
197 static struct usb_serial_driver cypress_ca42v2_device = {
198 .driver = {
199 .owner = THIS_MODULE,
200 .name = "nokiaca42v2",
201 },
202 .description = "Nokia CA-42 V2 Adapter",
203 .id_table = id_table_nokiaca42v2,
204 .num_ports = 1,
205 .port_probe = cypress_ca42v2_port_probe,
206 .port_remove = cypress_port_remove,
207 .open = cypress_open,
208 .close = cypress_close,
209 .dtr_rts = cypress_dtr_rts,
210 .write = cypress_write,
211 .write_room = cypress_write_room,
212 .set_termios = cypress_set_termios,
213 .tiocmget = cypress_tiocmget,
214 .tiocmset = cypress_tiocmset,
215 .tiocmiwait = usb_serial_generic_tiocmiwait,
216 .chars_in_buffer = cypress_chars_in_buffer,
217 .throttle = cypress_throttle,
218 .unthrottle = cypress_unthrottle,
219 .read_int_callback = cypress_read_int_callback,
220 .write_int_callback = cypress_write_int_callback,
221 };
222
223 static struct usb_serial_driver * const serial_drivers[] = {
224 &cypress_earthmate_device, &cypress_hidcom_device,
225 &cypress_ca42v2_device, NULL
226 };
227
228 /*****************************************************************************
229 * Cypress serial helper functions
230 *****************************************************************************/
231
232 /* FRWD Dongle hidcom needs to skip reset and speed checks */
233 static inline bool is_frwd(struct usb_device *dev)
234 {
235 return ((le16_to_cpu(dev->descriptor.idVendor) == VENDOR_ID_FRWD) &&
236 (le16_to_cpu(dev->descriptor.idProduct) == PRODUCT_ID_CYPHIDCOM_FRWD));
237 }
238
239 static int analyze_baud_rate(struct usb_serial_port *port, speed_t new_rate)
240 {
241 struct cypress_private *priv;
242 priv = usb_get_serial_port_data(port);
243
244 if (unstable_bauds)
245 return new_rate;
246
247 /* FRWD Dongle uses 115200 bps */
248 if (is_frwd(port->serial->dev))
249 return new_rate;
250
251 /*
252 * The general purpose firmware for the Cypress M8 allows for
253 * a maximum speed of 57600bps (I have no idea whether DeLorme
254 * chose to use the general purpose firmware or not), if you
255 * need to modify this speed setting for your own project
256 * please add your own chiptype and modify the code likewise.
257 * The Cypress HID->COM device will work successfully up to
258 * 115200bps (but the actual throughput is around 3kBps).
259 */
260 if (port->serial->dev->speed == USB_SPEED_LOW) {
261 /*
262 * Mike Isely <isely@pobox.com> 2-Feb-2008: The
263 * Cypress app note that describes this mechanism
264 * states the the low-speed part can't handle more
265 * than 800 bytes/sec, in which case 4800 baud is the
266 * safest speed for a part like that.
267 */
268 if (new_rate > 4800) {
269 dev_dbg(&port->dev,
270 "%s - failed setting baud rate, device incapable speed %d\n",
271 __func__, new_rate);
272 return -1;
273 }
274 }
275 switch (priv->chiptype) {
276 case CT_EARTHMATE:
277 if (new_rate <= 600) {
278 /* 300 and 600 baud rates are supported under
279 * the generic firmware, but are not used with
280 * NMEA and SiRF protocols */
281 dev_dbg(&port->dev,
282 "%s - failed setting baud rate, unsupported speed of %d on Earthmate GPS\n",
283 __func__, new_rate);
284 return -1;
285 }
286 break;
287 default:
288 break;
289 }
290 return new_rate;
291 }
292
293
294 /* This function can either set or retrieve the current serial line settings */
295 static int cypress_serial_control(struct tty_struct *tty,
296 struct usb_serial_port *port, speed_t baud_rate, int data_bits,
297 int stop_bits, int parity_enable, int parity_type, int reset,
298 int cypress_request_type)
299 {
300 int new_baudrate = 0, retval = 0, tries = 0;
301 struct cypress_private *priv;
302 struct device *dev = &port->dev;
303 u8 *feature_buffer;
304 const unsigned int feature_len = 5;
305 unsigned long flags;
306
307 priv = usb_get_serial_port_data(port);
308
309 if (!priv->comm_is_ok)
310 return -ENODEV;
311
312 feature_buffer = kcalloc(feature_len, sizeof(u8), GFP_KERNEL);
313 if (!feature_buffer)
314 return -ENOMEM;
315
316 switch (cypress_request_type) {
317 case CYPRESS_SET_CONFIG:
318 /* 0 means 'Hang up' so doesn't change the true bit rate */
319 new_baudrate = priv->baud_rate;
320 if (baud_rate && baud_rate != priv->baud_rate) {
321 dev_dbg(dev, "%s - baud rate is changing\n", __func__);
322 retval = analyze_baud_rate(port, baud_rate);
323 if (retval >= 0) {
324 new_baudrate = retval;
325 dev_dbg(dev, "%s - New baud rate set to %d\n",
326 __func__, new_baudrate);
327 }
328 }
329 dev_dbg(dev, "%s - baud rate is being sent as %d\n", __func__,
330 new_baudrate);
331
332 /* fill the feature_buffer with new configuration */
333 put_unaligned_le32(new_baudrate, feature_buffer);
334 feature_buffer[4] |= data_bits; /* assign data bits in 2 bit space ( max 3 ) */
335 /* 1 bit gap */
336 feature_buffer[4] |= (stop_bits << 3); /* assign stop bits in 1 bit space */
337 feature_buffer[4] |= (parity_enable << 4); /* assign parity flag in 1 bit space */
338 feature_buffer[4] |= (parity_type << 5); /* assign parity type in 1 bit space */
339 /* 1 bit gap */
340 feature_buffer[4] |= (reset << 7); /* assign reset at end of byte, 1 bit space */
341
342 dev_dbg(dev, "%s - device is being sent this feature report:\n", __func__);
343 dev_dbg(dev, "%s - %02X - %02X - %02X - %02X - %02X\n", __func__,
344 feature_buffer[0], feature_buffer[1],
345 feature_buffer[2], feature_buffer[3],
346 feature_buffer[4]);
347
348 do {
349 retval = usb_control_msg(port->serial->dev,
350 usb_sndctrlpipe(port->serial->dev, 0),
351 HID_REQ_SET_REPORT,
352 USB_DIR_OUT | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
353 0x0300, 0, feature_buffer,
354 feature_len, 500);
355
356 if (tries++ >= 3)
357 break;
358
359 } while (retval != feature_len &&
360 retval != -ENODEV);
361
362 if (retval != feature_len) {
363 dev_err(dev, "%s - failed sending serial line settings - %d\n",
364 __func__, retval);
365 cypress_set_dead(port);
366 } else {
367 spin_lock_irqsave(&priv->lock, flags);
368 priv->baud_rate = new_baudrate;
369 priv->current_config = feature_buffer[4];
370 spin_unlock_irqrestore(&priv->lock, flags);
371 /* If we asked for a speed change encode it */
372 if (baud_rate)
373 tty_encode_baud_rate(tty,
374 new_baudrate, new_baudrate);
375 }
376 break;
377 case CYPRESS_GET_CONFIG:
378 if (priv->get_cfg_unsafe) {
379 /* Not implemented for this device,
380 and if we try to do it we're likely
381 to crash the hardware. */
382 retval = -ENOTTY;
383 goto out;
384 }
385 dev_dbg(dev, "%s - retreiving serial line settings\n", __func__);
386 do {
387 retval = usb_control_msg(port->serial->dev,
388 usb_rcvctrlpipe(port->serial->dev, 0),
389 HID_REQ_GET_REPORT,
390 USB_DIR_IN | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
391 0x0300, 0, feature_buffer,
392 feature_len, 500);
393
394 if (tries++ >= 3)
395 break;
396 } while (retval != feature_len
397 && retval != -ENODEV);
398
399 if (retval != feature_len) {
400 dev_err(dev, "%s - failed to retrieve serial line settings - %d\n",
401 __func__, retval);
402 cypress_set_dead(port);
403 goto out;
404 } else {
405 spin_lock_irqsave(&priv->lock, flags);
406 /* store the config in one byte, and later
407 use bit masks to check values */
408 priv->current_config = feature_buffer[4];
409 priv->baud_rate = get_unaligned_le32(feature_buffer);
410 spin_unlock_irqrestore(&priv->lock, flags);
411 }
412 }
413 spin_lock_irqsave(&priv->lock, flags);
414 ++priv->cmd_count;
415 spin_unlock_irqrestore(&priv->lock, flags);
416 out:
417 kfree(feature_buffer);
418 return retval;
419 } /* cypress_serial_control */
420
421
422 static void cypress_set_dead(struct usb_serial_port *port)
423 {
424 struct cypress_private *priv = usb_get_serial_port_data(port);
425 unsigned long flags;
426
427 spin_lock_irqsave(&priv->lock, flags);
428 if (!priv->comm_is_ok) {
429 spin_unlock_irqrestore(&priv->lock, flags);
430 return;
431 }
432 priv->comm_is_ok = 0;
433 spin_unlock_irqrestore(&priv->lock, flags);
434
435 dev_err(&port->dev, "cypress_m8 suspending failing port %d - "
436 "interval might be too short\n", port->port_number);
437 }
438
439
440 /*****************************************************************************
441 * Cypress serial driver functions
442 *****************************************************************************/
443
444
445 static int cypress_generic_port_probe(struct usb_serial_port *port)
446 {
447 struct usb_serial *serial = port->serial;
448 struct cypress_private *priv;
449
450 priv = kzalloc(sizeof(struct cypress_private), GFP_KERNEL);
451 if (!priv)
452 return -ENOMEM;
453
454 priv->comm_is_ok = !0;
455 spin_lock_init(&priv->lock);
456 if (kfifo_alloc(&priv->write_fifo, CYPRESS_BUF_SIZE, GFP_KERNEL)) {
457 kfree(priv);
458 return -ENOMEM;
459 }
460
461 /* Skip reset for FRWD device. It is a workaound:
462 device hangs if it receives SET_CONFIGURE in Configured
463 state. */
464 if (!is_frwd(serial->dev))
465 usb_reset_configuration(serial->dev);
466
467 priv->cmd_ctrl = 0;
468 priv->line_control = 0;
469 priv->termios_initialized = 0;
470 priv->rx_flags = 0;
471 /* Default packet format setting is determined by packet size.
472 Anything with a size larger then 9 must have a separate
473 count field since the 3 bit count field is otherwise too
474 small. Otherwise we can use the slightly more compact
475 format. This is in accordance with the cypress_m8 serial
476 converter app note. */
477 if (port->interrupt_out_size > 9)
478 priv->pkt_fmt = packet_format_1;
479 else
480 priv->pkt_fmt = packet_format_2;
481
482 if (interval > 0) {
483 priv->write_urb_interval = interval;
484 priv->read_urb_interval = interval;
485 dev_dbg(&port->dev, "%s - read & write intervals forced to %d\n",
486 __func__, interval);
487 } else {
488 priv->write_urb_interval = port->interrupt_out_urb->interval;
489 priv->read_urb_interval = port->interrupt_in_urb->interval;
490 dev_dbg(&port->dev, "%s - intervals: read=%d write=%d\n",
491 __func__, priv->read_urb_interval,
492 priv->write_urb_interval);
493 }
494 usb_set_serial_port_data(port, priv);
495
496 port->port.drain_delay = 256;
497
498 return 0;
499 }
500
501
502 static int cypress_earthmate_port_probe(struct usb_serial_port *port)
503 {
504 struct usb_serial *serial = port->serial;
505 struct cypress_private *priv;
506 int ret;
507
508 ret = cypress_generic_port_probe(port);
509 if (ret) {
510 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
511 return ret;
512 }
513
514 priv = usb_get_serial_port_data(port);
515 priv->chiptype = CT_EARTHMATE;
516 /* All Earthmate devices use the separated-count packet
517 format! Idiotic. */
518 priv->pkt_fmt = packet_format_1;
519 if (serial->dev->descriptor.idProduct !=
520 cpu_to_le16(PRODUCT_ID_EARTHMATEUSB)) {
521 /* The old original USB Earthmate seemed able to
522 handle GET_CONFIG requests; everything they've
523 produced since that time crashes if this command is
524 attempted :-( */
525 dev_dbg(&port->dev,
526 "%s - Marking this device as unsafe for GET_CONFIG commands\n",
527 __func__);
528 priv->get_cfg_unsafe = !0;
529 }
530
531 return 0;
532 }
533
534 static int cypress_hidcom_port_probe(struct usb_serial_port *port)
535 {
536 struct cypress_private *priv;
537 int ret;
538
539 ret = cypress_generic_port_probe(port);
540 if (ret) {
541 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
542 return ret;
543 }
544
545 priv = usb_get_serial_port_data(port);
546 priv->chiptype = CT_CYPHIDCOM;
547
548 return 0;
549 }
550
551 static int cypress_ca42v2_port_probe(struct usb_serial_port *port)
552 {
553 struct cypress_private *priv;
554 int ret;
555
556 ret = cypress_generic_port_probe(port);
557 if (ret) {
558 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
559 return ret;
560 }
561
562 priv = usb_get_serial_port_data(port);
563 priv->chiptype = CT_CA42V2;
564
565 return 0;
566 }
567
568 static int cypress_port_remove(struct usb_serial_port *port)
569 {
570 struct cypress_private *priv;
571
572 priv = usb_get_serial_port_data(port);
573
574 kfifo_free(&priv->write_fifo);
575 kfree(priv);
576
577 return 0;
578 }
579
580 static int cypress_open(struct tty_struct *tty, struct usb_serial_port *port)
581 {
582 struct cypress_private *priv = usb_get_serial_port_data(port);
583 struct usb_serial *serial = port->serial;
584 unsigned long flags;
585 int result = 0;
586
587 if (!priv->comm_is_ok)
588 return -EIO;
589
590 /* clear halts before open */
591 usb_clear_halt(serial->dev, 0x81);
592 usb_clear_halt(serial->dev, 0x02);
593
594 spin_lock_irqsave(&priv->lock, flags);
595 /* reset read/write statistics */
596 priv->bytes_in = 0;
597 priv->bytes_out = 0;
598 priv->cmd_count = 0;
599 priv->rx_flags = 0;
600 spin_unlock_irqrestore(&priv->lock, flags);
601
602 /* Set termios */
603 cypress_send(port);
604
605 if (tty)
606 cypress_set_termios(tty, port, &priv->tmp_termios);
607
608 /* setup the port and start reading from the device */
609 if (!port->interrupt_in_urb) {
610 dev_err(&port->dev, "%s - interrupt_in_urb is empty!\n",
611 __func__);
612 return -1;
613 }
614
615 usb_fill_int_urb(port->interrupt_in_urb, serial->dev,
616 usb_rcvintpipe(serial->dev, port->interrupt_in_endpointAddress),
617 port->interrupt_in_urb->transfer_buffer,
618 port->interrupt_in_urb->transfer_buffer_length,
619 cypress_read_int_callback, port, priv->read_urb_interval);
620 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
621
622 if (result) {
623 dev_err(&port->dev,
624 "%s - failed submitting read urb, error %d\n",
625 __func__, result);
626 cypress_set_dead(port);
627 }
628
629 return result;
630 } /* cypress_open */
631
632 static void cypress_dtr_rts(struct usb_serial_port *port, int on)
633 {
634 struct cypress_private *priv = usb_get_serial_port_data(port);
635 /* drop dtr and rts */
636 spin_lock_irq(&priv->lock);
637 if (on == 0)
638 priv->line_control = 0;
639 else
640 priv->line_control = CONTROL_DTR | CONTROL_RTS;
641 priv->cmd_ctrl = 1;
642 spin_unlock_irq(&priv->lock);
643 cypress_write(NULL, port, NULL, 0);
644 }
645
646 static void cypress_close(struct usb_serial_port *port)
647 {
648 struct cypress_private *priv = usb_get_serial_port_data(port);
649 unsigned long flags;
650
651 spin_lock_irqsave(&priv->lock, flags);
652 kfifo_reset_out(&priv->write_fifo);
653 spin_unlock_irqrestore(&priv->lock, flags);
654
655 dev_dbg(&port->dev, "%s - stopping urbs\n", __func__);
656 usb_kill_urb(port->interrupt_in_urb);
657 usb_kill_urb(port->interrupt_out_urb);
658
659 if (stats)
660 dev_info(&port->dev, "Statistics: %d Bytes In | %d Bytes Out | %d Commands Issued\n",
661 priv->bytes_in, priv->bytes_out, priv->cmd_count);
662 } /* cypress_close */
663
664
665 static int cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
666 const unsigned char *buf, int count)
667 {
668 struct cypress_private *priv = usb_get_serial_port_data(port);
669
670 dev_dbg(&port->dev, "%s - %d bytes\n", __func__, count);
671
672 /* line control commands, which need to be executed immediately,
673 are not put into the buffer for obvious reasons.
674 */
675 if (priv->cmd_ctrl) {
676 count = 0;
677 goto finish;
678 }
679
680 if (!count)
681 return count;
682
683 count = kfifo_in_locked(&priv->write_fifo, buf, count, &priv->lock);
684
685 finish:
686 cypress_send(port);
687
688 return count;
689 } /* cypress_write */
690
691
692 static void cypress_send(struct usb_serial_port *port)
693 {
694 int count = 0, result, offset, actual_size;
695 struct cypress_private *priv = usb_get_serial_port_data(port);
696 struct device *dev = &port->dev;
697 unsigned long flags;
698
699 if (!priv->comm_is_ok)
700 return;
701
702 dev_dbg(dev, "%s - interrupt out size is %d\n", __func__,
703 port->interrupt_out_size);
704
705 spin_lock_irqsave(&priv->lock, flags);
706 if (priv->write_urb_in_use) {
707 dev_dbg(dev, "%s - can't write, urb in use\n", __func__);
708 spin_unlock_irqrestore(&priv->lock, flags);
709 return;
710 }
711 spin_unlock_irqrestore(&priv->lock, flags);
712
713 /* clear buffer */
714 memset(port->interrupt_out_urb->transfer_buffer, 0,
715 port->interrupt_out_size);
716
717 spin_lock_irqsave(&priv->lock, flags);
718 switch (priv->pkt_fmt) {
719 default:
720 case packet_format_1:
721 /* this is for the CY7C64013... */
722 offset = 2;
723 port->interrupt_out_buffer[0] = priv->line_control;
724 break;
725 case packet_format_2:
726 /* this is for the CY7C63743... */
727 offset = 1;
728 port->interrupt_out_buffer[0] = priv->line_control;
729 break;
730 }
731
732 if (priv->line_control & CONTROL_RESET)
733 priv->line_control &= ~CONTROL_RESET;
734
735 if (priv->cmd_ctrl) {
736 priv->cmd_count++;
737 dev_dbg(dev, "%s - line control command being issued\n", __func__);
738 spin_unlock_irqrestore(&priv->lock, flags);
739 goto send;
740 } else
741 spin_unlock_irqrestore(&priv->lock, flags);
742
743 count = kfifo_out_locked(&priv->write_fifo,
744 &port->interrupt_out_buffer[offset],
745 port->interrupt_out_size - offset,
746 &priv->lock);
747 if (count == 0)
748 return;
749
750 switch (priv->pkt_fmt) {
751 default:
752 case packet_format_1:
753 port->interrupt_out_buffer[1] = count;
754 break;
755 case packet_format_2:
756 port->interrupt_out_buffer[0] |= count;
757 }
758
759 dev_dbg(dev, "%s - count is %d\n", __func__, count);
760
761 send:
762 spin_lock_irqsave(&priv->lock, flags);
763 priv->write_urb_in_use = 1;
764 spin_unlock_irqrestore(&priv->lock, flags);
765
766 if (priv->cmd_ctrl)
767 actual_size = 1;
768 else
769 actual_size = count +
770 (priv->pkt_fmt == packet_format_1 ? 2 : 1);
771
772 usb_serial_debug_data(dev, __func__, port->interrupt_out_size,
773 port->interrupt_out_urb->transfer_buffer);
774
775 usb_fill_int_urb(port->interrupt_out_urb, port->serial->dev,
776 usb_sndintpipe(port->serial->dev, port->interrupt_out_endpointAddress),
777 port->interrupt_out_buffer, port->interrupt_out_size,
778 cypress_write_int_callback, port, priv->write_urb_interval);
779 result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC);
780 if (result) {
781 dev_err_console(port,
782 "%s - failed submitting write urb, error %d\n",
783 __func__, result);
784 priv->write_urb_in_use = 0;
785 cypress_set_dead(port);
786 }
787
788 spin_lock_irqsave(&priv->lock, flags);
789 if (priv->cmd_ctrl)
790 priv->cmd_ctrl = 0;
791
792 /* do not count the line control and size bytes */
793 priv->bytes_out += count;
794 spin_unlock_irqrestore(&priv->lock, flags);
795
796 usb_serial_port_softint(port);
797 } /* cypress_send */
798
799
800 /* returns how much space is available in the soft buffer */
801 static int cypress_write_room(struct tty_struct *tty)
802 {
803 struct usb_serial_port *port = tty->driver_data;
804 struct cypress_private *priv = usb_get_serial_port_data(port);
805 int room = 0;
806 unsigned long flags;
807
808 spin_lock_irqsave(&priv->lock, flags);
809 room = kfifo_avail(&priv->write_fifo);
810 spin_unlock_irqrestore(&priv->lock, flags);
811
812 dev_dbg(&port->dev, "%s - returns %d\n", __func__, room);
813 return room;
814 }
815
816
817 static int cypress_tiocmget(struct tty_struct *tty)
818 {
819 struct usb_serial_port *port = tty->driver_data;
820 struct cypress_private *priv = usb_get_serial_port_data(port);
821 __u8 status, control;
822 unsigned int result = 0;
823 unsigned long flags;
824
825 spin_lock_irqsave(&priv->lock, flags);
826 control = priv->line_control;
827 status = priv->current_status;
828 spin_unlock_irqrestore(&priv->lock, flags);
829
830 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
831 | ((control & CONTROL_RTS) ? TIOCM_RTS : 0)
832 | ((status & UART_CTS) ? TIOCM_CTS : 0)
833 | ((status & UART_DSR) ? TIOCM_DSR : 0)
834 | ((status & UART_RI) ? TIOCM_RI : 0)
835 | ((status & UART_CD) ? TIOCM_CD : 0);
836
837 dev_dbg(&port->dev, "%s - result = %x\n", __func__, result);
838
839 return result;
840 }
841
842
843 static int cypress_tiocmset(struct tty_struct *tty,
844 unsigned int set, unsigned int clear)
845 {
846 struct usb_serial_port *port = tty->driver_data;
847 struct cypress_private *priv = usb_get_serial_port_data(port);
848 unsigned long flags;
849
850 spin_lock_irqsave(&priv->lock, flags);
851 if (set & TIOCM_RTS)
852 priv->line_control |= CONTROL_RTS;
853 if (set & TIOCM_DTR)
854 priv->line_control |= CONTROL_DTR;
855 if (clear & TIOCM_RTS)
856 priv->line_control &= ~CONTROL_RTS;
857 if (clear & TIOCM_DTR)
858 priv->line_control &= ~CONTROL_DTR;
859 priv->cmd_ctrl = 1;
860 spin_unlock_irqrestore(&priv->lock, flags);
861
862 return cypress_write(tty, port, NULL, 0);
863 }
864
865 static void cypress_set_termios(struct tty_struct *tty,
866 struct usb_serial_port *port, struct ktermios *old_termios)
867 {
868 struct cypress_private *priv = usb_get_serial_port_data(port);
869 struct device *dev = &port->dev;
870 int data_bits, stop_bits, parity_type, parity_enable;
871 unsigned cflag, iflag;
872 unsigned long flags;
873 __u8 oldlines;
874 int linechange = 0;
875
876 spin_lock_irqsave(&priv->lock, flags);
877 /* We can't clean this one up as we don't know the device type
878 early enough */
879 if (!priv->termios_initialized) {
880 if (priv->chiptype == CT_EARTHMATE) {
881 tty->termios = tty_std_termios;
882 tty->termios.c_cflag = B4800 | CS8 | CREAD | HUPCL |
883 CLOCAL;
884 tty->termios.c_ispeed = 4800;
885 tty->termios.c_ospeed = 4800;
886 } else if (priv->chiptype == CT_CYPHIDCOM) {
887 tty->termios = tty_std_termios;
888 tty->termios.c_cflag = B9600 | CS8 | CREAD | HUPCL |
889 CLOCAL;
890 tty->termios.c_ispeed = 9600;
891 tty->termios.c_ospeed = 9600;
892 } else if (priv->chiptype == CT_CA42V2) {
893 tty->termios = tty_std_termios;
894 tty->termios.c_cflag = B9600 | CS8 | CREAD | HUPCL |
895 CLOCAL;
896 tty->termios.c_ispeed = 9600;
897 tty->termios.c_ospeed = 9600;
898 }
899 priv->termios_initialized = 1;
900 }
901 spin_unlock_irqrestore(&priv->lock, flags);
902
903 /* Unsupported features need clearing */
904 tty->termios.c_cflag &= ~(CMSPAR|CRTSCTS);
905
906 cflag = tty->termios.c_cflag;
907 iflag = tty->termios.c_iflag;
908
909 /* check if there are new settings */
910 if (old_termios) {
911 spin_lock_irqsave(&priv->lock, flags);
912 priv->tmp_termios = tty->termios;
913 spin_unlock_irqrestore(&priv->lock, flags);
914 }
915
916 /* set number of data bits, parity, stop bits */
917 /* when parity is disabled the parity type bit is ignored */
918
919 /* 1 means 2 stop bits, 0 means 1 stop bit */
920 stop_bits = cflag & CSTOPB ? 1 : 0;
921
922 if (cflag & PARENB) {
923 parity_enable = 1;
924 /* 1 means odd parity, 0 means even parity */
925 parity_type = cflag & PARODD ? 1 : 0;
926 } else
927 parity_enable = parity_type = 0;
928
929 switch (cflag & CSIZE) {
930 case CS5:
931 data_bits = 0;
932 break;
933 case CS6:
934 data_bits = 1;
935 break;
936 case CS7:
937 data_bits = 2;
938 break;
939 case CS8:
940 data_bits = 3;
941 break;
942 default:
943 dev_err(dev, "%s - CSIZE was set, but not CS5-CS8\n", __func__);
944 data_bits = 3;
945 }
946 spin_lock_irqsave(&priv->lock, flags);
947 oldlines = priv->line_control;
948 if ((cflag & CBAUD) == B0) {
949 /* drop dtr and rts */
950 dev_dbg(dev, "%s - dropping the lines, baud rate 0bps\n", __func__);
951 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
952 } else
953 priv->line_control = (CONTROL_DTR | CONTROL_RTS);
954 spin_unlock_irqrestore(&priv->lock, flags);
955
956 dev_dbg(dev, "%s - sending %d stop_bits, %d parity_enable, %d parity_type, %d data_bits (+5)\n",
957 __func__, stop_bits, parity_enable, parity_type, data_bits);
958
959 cypress_serial_control(tty, port, tty_get_baud_rate(tty),
960 data_bits, stop_bits,
961 parity_enable, parity_type,
962 0, CYPRESS_SET_CONFIG);
963
964 /* we perform a CYPRESS_GET_CONFIG so that the current settings are
965 * filled into the private structure this should confirm that all is
966 * working if it returns what we just set */
967 cypress_serial_control(tty, port, 0, 0, 0, 0, 0, 0, CYPRESS_GET_CONFIG);
968
969 /* Here we can define custom tty settings for devices; the main tty
970 * termios flag base comes from empeg.c */
971
972 spin_lock_irqsave(&priv->lock, flags);
973 if (priv->chiptype == CT_EARTHMATE && priv->baud_rate == 4800) {
974 dev_dbg(dev, "Using custom termios settings for a baud rate of 4800bps.\n");
975 /* define custom termios settings for NMEA protocol */
976
977 tty->termios.c_iflag /* input modes - */
978 &= ~(IGNBRK /* disable ignore break */
979 | BRKINT /* disable break causes interrupt */
980 | PARMRK /* disable mark parity errors */
981 | ISTRIP /* disable clear high bit of input char */
982 | INLCR /* disable translate NL to CR */
983 | IGNCR /* disable ignore CR */
984 | ICRNL /* disable translate CR to NL */
985 | IXON); /* disable enable XON/XOFF flow control */
986
987 tty->termios.c_oflag /* output modes */
988 &= ~OPOST; /* disable postprocess output char */
989
990 tty->termios.c_lflag /* line discipline modes */
991 &= ~(ECHO /* disable echo input characters */
992 | ECHONL /* disable echo new line */
993 | ICANON /* disable erase, kill, werase, and rprnt
994 special characters */
995 | ISIG /* disable interrupt, quit, and suspend
996 special characters */
997 | IEXTEN); /* disable non-POSIX special characters */
998 } /* CT_CYPHIDCOM: Application should handle this for device */
999
1000 linechange = (priv->line_control != oldlines);
1001 spin_unlock_irqrestore(&priv->lock, flags);
1002
1003 /* if necessary, set lines */
1004 if (linechange) {
1005 priv->cmd_ctrl = 1;
1006 cypress_write(tty, port, NULL, 0);
1007 }
1008 } /* cypress_set_termios */
1009
1010
1011 /* returns amount of data still left in soft buffer */
1012 static int cypress_chars_in_buffer(struct tty_struct *tty)
1013 {
1014 struct usb_serial_port *port = tty->driver_data;
1015 struct cypress_private *priv = usb_get_serial_port_data(port);
1016 int chars = 0;
1017 unsigned long flags;
1018
1019 spin_lock_irqsave(&priv->lock, flags);
1020 chars = kfifo_len(&priv->write_fifo);
1021 spin_unlock_irqrestore(&priv->lock, flags);
1022
1023 dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
1024 return chars;
1025 }
1026
1027
1028 static void cypress_throttle(struct tty_struct *tty)
1029 {
1030 struct usb_serial_port *port = tty->driver_data;
1031 struct cypress_private *priv = usb_get_serial_port_data(port);
1032
1033 spin_lock_irq(&priv->lock);
1034 priv->rx_flags = THROTTLED;
1035 spin_unlock_irq(&priv->lock);
1036 }
1037
1038
1039 static void cypress_unthrottle(struct tty_struct *tty)
1040 {
1041 struct usb_serial_port *port = tty->driver_data;
1042 struct cypress_private *priv = usb_get_serial_port_data(port);
1043 int actually_throttled, result;
1044
1045 spin_lock_irq(&priv->lock);
1046 actually_throttled = priv->rx_flags & ACTUALLY_THROTTLED;
1047 priv->rx_flags = 0;
1048 spin_unlock_irq(&priv->lock);
1049
1050 if (!priv->comm_is_ok)
1051 return;
1052
1053 if (actually_throttled) {
1054 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
1055 if (result) {
1056 dev_err(&port->dev, "%s - failed submitting read urb, "
1057 "error %d\n", __func__, result);
1058 cypress_set_dead(port);
1059 }
1060 }
1061 }
1062
1063
1064 static void cypress_read_int_callback(struct urb *urb)
1065 {
1066 struct usb_serial_port *port = urb->context;
1067 struct cypress_private *priv = usb_get_serial_port_data(port);
1068 struct device *dev = &urb->dev->dev;
1069 struct tty_struct *tty;
1070 unsigned char *data = urb->transfer_buffer;
1071 unsigned long flags;
1072 char tty_flag = TTY_NORMAL;
1073 int havedata = 0;
1074 int bytes = 0;
1075 int result;
1076 int i = 0;
1077 int status = urb->status;
1078
1079 switch (status) {
1080 case 0: /* success */
1081 break;
1082 case -ECONNRESET:
1083 case -ENOENT:
1084 case -ESHUTDOWN:
1085 /* precursor to disconnect so just go away */
1086 return;
1087 case -EPIPE:
1088 /* Can't call usb_clear_halt while in_interrupt */
1089 /* FALLS THROUGH */
1090 default:
1091 /* something ugly is going on... */
1092 dev_err(dev, "%s - unexpected nonzero read status received: %d\n",
1093 __func__, status);
1094 cypress_set_dead(port);
1095 return;
1096 }
1097
1098 spin_lock_irqsave(&priv->lock, flags);
1099 if (priv->rx_flags & THROTTLED) {
1100 dev_dbg(dev, "%s - now throttling\n", __func__);
1101 priv->rx_flags |= ACTUALLY_THROTTLED;
1102 spin_unlock_irqrestore(&priv->lock, flags);
1103 return;
1104 }
1105 spin_unlock_irqrestore(&priv->lock, flags);
1106
1107 tty = tty_port_tty_get(&port->port);
1108 if (!tty) {
1109 dev_dbg(dev, "%s - bad tty pointer - exiting\n", __func__);
1110 return;
1111 }
1112
1113 spin_lock_irqsave(&priv->lock, flags);
1114 result = urb->actual_length;
1115 switch (priv->pkt_fmt) {
1116 default:
1117 case packet_format_1:
1118 /* This is for the CY7C64013... */
1119 priv->current_status = data[0] & 0xF8;
1120 bytes = data[1] + 2;
1121 i = 2;
1122 if (bytes > 2)
1123 havedata = 1;
1124 break;
1125 case packet_format_2:
1126 /* This is for the CY7C63743... */
1127 priv->current_status = data[0] & 0xF8;
1128 bytes = (data[0] & 0x07) + 1;
1129 i = 1;
1130 if (bytes > 1)
1131 havedata = 1;
1132 break;
1133 }
1134 spin_unlock_irqrestore(&priv->lock, flags);
1135 if (result < bytes) {
1136 dev_dbg(dev,
1137 "%s - wrong packet size - received %d bytes but packet said %d bytes\n",
1138 __func__, result, bytes);
1139 goto continue_read;
1140 }
1141
1142 usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
1143
1144 spin_lock_irqsave(&priv->lock, flags);
1145 /* check to see if status has changed */
1146 if (priv->current_status != priv->prev_status) {
1147 u8 delta = priv->current_status ^ priv->prev_status;
1148
1149 if (delta & UART_MSR_MASK) {
1150 if (delta & UART_CTS)
1151 port->icount.cts++;
1152 if (delta & UART_DSR)
1153 port->icount.dsr++;
1154 if (delta & UART_RI)
1155 port->icount.rng++;
1156 if (delta & UART_CD)
1157 port->icount.dcd++;
1158
1159 wake_up_interruptible(&port->port.delta_msr_wait);
1160 }
1161
1162 priv->prev_status = priv->current_status;
1163 }
1164 spin_unlock_irqrestore(&priv->lock, flags);
1165
1166 /* hangup, as defined in acm.c... this might be a bad place for it
1167 * though */
1168 if (tty && !C_CLOCAL(tty) && !(priv->current_status & UART_CD)) {
1169 dev_dbg(dev, "%s - calling hangup\n", __func__);
1170 tty_hangup(tty);
1171 goto continue_read;
1172 }
1173
1174 /* There is one error bit... I'm assuming it is a parity error
1175 * indicator as the generic firmware will set this bit to 1 if a
1176 * parity error occurs.
1177 * I can not find reference to any other error events. */
1178 spin_lock_irqsave(&priv->lock, flags);
1179 if (priv->current_status & CYP_ERROR) {
1180 spin_unlock_irqrestore(&priv->lock, flags);
1181 tty_flag = TTY_PARITY;
1182 dev_dbg(dev, "%s - Parity Error detected\n", __func__);
1183 } else
1184 spin_unlock_irqrestore(&priv->lock, flags);
1185
1186 /* process read if there is data other than line status */
1187 if (bytes > i) {
1188 tty_insert_flip_string_fixed_flag(&port->port, data + i,
1189 tty_flag, bytes - i);
1190 tty_flip_buffer_push(&port->port);
1191 }
1192
1193 spin_lock_irqsave(&priv->lock, flags);
1194 /* control and status byte(s) are also counted */
1195 priv->bytes_in += bytes;
1196 spin_unlock_irqrestore(&priv->lock, flags);
1197
1198 continue_read:
1199 tty_kref_put(tty);
1200
1201 /* Continue trying to always read */
1202
1203 if (priv->comm_is_ok) {
1204 usb_fill_int_urb(port->interrupt_in_urb, port->serial->dev,
1205 usb_rcvintpipe(port->serial->dev,
1206 port->interrupt_in_endpointAddress),
1207 port->interrupt_in_urb->transfer_buffer,
1208 port->interrupt_in_urb->transfer_buffer_length,
1209 cypress_read_int_callback, port,
1210 priv->read_urb_interval);
1211 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
1212 if (result && result != -EPERM) {
1213 dev_err(dev, "%s - failed resubmitting read urb, error %d\n",
1214 __func__, result);
1215 cypress_set_dead(port);
1216 }
1217 }
1218 } /* cypress_read_int_callback */
1219
1220
1221 static void cypress_write_int_callback(struct urb *urb)
1222 {
1223 struct usb_serial_port *port = urb->context;
1224 struct cypress_private *priv = usb_get_serial_port_data(port);
1225 struct device *dev = &urb->dev->dev;
1226 int status = urb->status;
1227
1228 switch (status) {
1229 case 0:
1230 /* success */
1231 break;
1232 case -ECONNRESET:
1233 case -ENOENT:
1234 case -ESHUTDOWN:
1235 /* this urb is terminated, clean up */
1236 dev_dbg(dev, "%s - urb shutting down with status: %d\n",
1237 __func__, status);
1238 priv->write_urb_in_use = 0;
1239 return;
1240 case -EPIPE:
1241 /* Cannot call usb_clear_halt while in_interrupt */
1242 /* FALLTHROUGH */
1243 default:
1244 dev_err(dev, "%s - unexpected nonzero write status received: %d\n",
1245 __func__, status);
1246 cypress_set_dead(port);
1247 break;
1248 }
1249 priv->write_urb_in_use = 0;
1250
1251 /* send any buffered data */
1252 cypress_send(port);
1253 }
1254
1255 module_usb_serial_driver(serial_drivers, id_table_combined);
1256
1257 MODULE_AUTHOR(DRIVER_AUTHOR);
1258 MODULE_DESCRIPTION(DRIVER_DESC);
1259 MODULE_LICENSE("GPL");
1260
1261 module_param(stats, bool, S_IRUGO | S_IWUSR);
1262 MODULE_PARM_DESC(stats, "Enable statistics or not");
1263 module_param(interval, int, S_IRUGO | S_IWUSR);
1264 MODULE_PARM_DESC(interval, "Overrides interrupt interval");
1265 module_param(unstable_bauds, bool, S_IRUGO | S_IWUSR);
1266 MODULE_PARM_DESC(unstable_bauds, "Allow unstable baud rates");
Linux kernel - Deliverables
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