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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
48static bool stats;
49static int interval;
50static 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
58static 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
64static 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
71static const struct usb_device_id id_table_nokiaca42v2[] = {
72 { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
73 { } /* Terminating entry */
74};
75
76static 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
86MODULE_DEVICE_TABLE(usb, id_table_combined);
87
88enum 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
93struct 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 */
122static int cypress_earthmate_port_probe(struct usb_serial_port *port);
123static int cypress_hidcom_port_probe(struct usb_serial_port *port);
124static int cypress_ca42v2_port_probe(struct usb_serial_port *port);
125static int cypress_port_remove(struct usb_serial_port *port);
126static int cypress_open(struct tty_struct *tty, struct usb_serial_port *port);
127static void cypress_close(struct usb_serial_port *port);
128static void cypress_dtr_rts(struct usb_serial_port *port, int on);
129static int cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
130 const unsigned char *buf, int count);
131static void cypress_send(struct usb_serial_port *port);
132static int cypress_write_room(struct tty_struct *tty);
133static void cypress_set_termios(struct tty_struct *tty,
134 struct usb_serial_port *port, struct ktermios *old);
135static int cypress_tiocmget(struct tty_struct *tty);
136static int cypress_tiocmset(struct tty_struct *tty,
137 unsigned int set, unsigned int clear);
138static int cypress_chars_in_buffer(struct tty_struct *tty);
139static void cypress_throttle(struct tty_struct *tty);
140static void cypress_unthrottle(struct tty_struct *tty);
141static void cypress_set_dead(struct usb_serial_port *port);
142static void cypress_read_int_callback(struct urb *urb);
143static void cypress_write_int_callback(struct urb *urb);
144
145static 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
171static 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
197static 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
223static 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 */
233static 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
239static 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 */
295static 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);
416out:
417 kfree(feature_buffer);
418 return retval;
419} /* cypress_serial_control */
420
421
422static 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
445static 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 if (!port->interrupt_out_urb || !port->interrupt_in_urb) {
451 dev_err(&port->dev, "required endpoint is missing\n");
452 return -ENODEV;
453 }
454
455 priv = kzalloc(sizeof(struct cypress_private), GFP_KERNEL);
456 if (!priv)
457 return -ENOMEM;
458
459 priv->comm_is_ok = !0;
460 spin_lock_init(&priv->lock);
461 if (kfifo_alloc(&priv->write_fifo, CYPRESS_BUF_SIZE, GFP_KERNEL)) {
462 kfree(priv);
463 return -ENOMEM;
464 }
465
466 /* Skip reset for FRWD device. It is a workaound:
467 device hangs if it receives SET_CONFIGURE in Configured
468 state. */
469 if (!is_frwd(serial->dev))
470 usb_reset_configuration(serial->dev);
471
472 priv->cmd_ctrl = 0;
473 priv->line_control = 0;
474 priv->termios_initialized = 0;
475 priv->rx_flags = 0;
476 /* Default packet format setting is determined by packet size.
477 Anything with a size larger then 9 must have a separate
478 count field since the 3 bit count field is otherwise too
479 small. Otherwise we can use the slightly more compact
480 format. This is in accordance with the cypress_m8 serial
481 converter app note. */
482 if (port->interrupt_out_size > 9)
483 priv->pkt_fmt = packet_format_1;
484 else
485 priv->pkt_fmt = packet_format_2;
486
487 if (interval > 0) {
488 priv->write_urb_interval = interval;
489 priv->read_urb_interval = interval;
490 dev_dbg(&port->dev, "%s - read & write intervals forced to %d\n",
491 __func__, interval);
492 } else {
493 priv->write_urb_interval = port->interrupt_out_urb->interval;
494 priv->read_urb_interval = port->interrupt_in_urb->interval;
495 dev_dbg(&port->dev, "%s - intervals: read=%d write=%d\n",
496 __func__, priv->read_urb_interval,
497 priv->write_urb_interval);
498 }
499 usb_set_serial_port_data(port, priv);
500
501 port->port.drain_delay = 256;
502
503 return 0;
504}
505
506
507static int cypress_earthmate_port_probe(struct usb_serial_port *port)
508{
509 struct usb_serial *serial = port->serial;
510 struct cypress_private *priv;
511 int ret;
512
513 ret = cypress_generic_port_probe(port);
514 if (ret) {
515 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
516 return ret;
517 }
518
519 priv = usb_get_serial_port_data(port);
520 priv->chiptype = CT_EARTHMATE;
521 /* All Earthmate devices use the separated-count packet
522 format! Idiotic. */
523 priv->pkt_fmt = packet_format_1;
524 if (serial->dev->descriptor.idProduct !=
525 cpu_to_le16(PRODUCT_ID_EARTHMATEUSB)) {
526 /* The old original USB Earthmate seemed able to
527 handle GET_CONFIG requests; everything they've
528 produced since that time crashes if this command is
529 attempted :-( */
530 dev_dbg(&port->dev,
531 "%s - Marking this device as unsafe for GET_CONFIG commands\n",
532 __func__);
533 priv->get_cfg_unsafe = !0;
534 }
535
536 return 0;
537}
538
539static int cypress_hidcom_port_probe(struct usb_serial_port *port)
540{
541 struct cypress_private *priv;
542 int ret;
543
544 ret = cypress_generic_port_probe(port);
545 if (ret) {
546 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
547 return ret;
548 }
549
550 priv = usb_get_serial_port_data(port);
551 priv->chiptype = CT_CYPHIDCOM;
552
553 return 0;
554}
555
556static int cypress_ca42v2_port_probe(struct usb_serial_port *port)
557{
558 struct cypress_private *priv;
559 int ret;
560
561 ret = cypress_generic_port_probe(port);
562 if (ret) {
563 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
564 return ret;
565 }
566
567 priv = usb_get_serial_port_data(port);
568 priv->chiptype = CT_CA42V2;
569
570 return 0;
571}
572
573static int cypress_port_remove(struct usb_serial_port *port)
574{
575 struct cypress_private *priv;
576
577 priv = usb_get_serial_port_data(port);
578
579 kfifo_free(&priv->write_fifo);
580 kfree(priv);
581
582 return 0;
583}
584
585static int cypress_open(struct tty_struct *tty, struct usb_serial_port *port)
586{
587 struct cypress_private *priv = usb_get_serial_port_data(port);
588 struct usb_serial *serial = port->serial;
589 unsigned long flags;
590 int result = 0;
591
592 if (!priv->comm_is_ok)
593 return -EIO;
594
595 /* clear halts before open */
596 usb_clear_halt(serial->dev, 0x81);
597 usb_clear_halt(serial->dev, 0x02);
598
599 spin_lock_irqsave(&priv->lock, flags);
600 /* reset read/write statistics */
601 priv->bytes_in = 0;
602 priv->bytes_out = 0;
603 priv->cmd_count = 0;
604 priv->rx_flags = 0;
605 spin_unlock_irqrestore(&priv->lock, flags);
606
607 /* Set termios */
608 cypress_send(port);
609
610 if (tty)
611 cypress_set_termios(tty, port, &priv->tmp_termios);
612
613 /* setup the port and start reading from the device */
614 usb_fill_int_urb(port->interrupt_in_urb, serial->dev,
615 usb_rcvintpipe(serial->dev, port->interrupt_in_endpointAddress),
616 port->interrupt_in_urb->transfer_buffer,
617 port->interrupt_in_urb->transfer_buffer_length,
618 cypress_read_int_callback, port, priv->read_urb_interval);
619 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
620
621 if (result) {
622 dev_err(&port->dev,
623 "%s - failed submitting read urb, error %d\n",
624 __func__, result);
625 cypress_set_dead(port);
626 }
627
628 return result;
629} /* cypress_open */
630
631static void cypress_dtr_rts(struct usb_serial_port *port, int on)
632{
633 struct cypress_private *priv = usb_get_serial_port_data(port);
634 /* drop dtr and rts */
635 spin_lock_irq(&priv->lock);
636 if (on == 0)
637 priv->line_control = 0;
638 else
639 priv->line_control = CONTROL_DTR | CONTROL_RTS;
640 priv->cmd_ctrl = 1;
641 spin_unlock_irq(&priv->lock);
642 cypress_write(NULL, port, NULL, 0);
643}
644
645static void cypress_close(struct usb_serial_port *port)
646{
647 struct cypress_private *priv = usb_get_serial_port_data(port);
648 unsigned long flags;
649
650 spin_lock_irqsave(&priv->lock, flags);
651 kfifo_reset_out(&priv->write_fifo);
652 spin_unlock_irqrestore(&priv->lock, flags);
653
654 dev_dbg(&port->dev, "%s - stopping urbs\n", __func__);
655 usb_kill_urb(port->interrupt_in_urb);
656 usb_kill_urb(port->interrupt_out_urb);
657
658 if (stats)
659 dev_info(&port->dev, "Statistics: %d Bytes In | %d Bytes Out | %d Commands Issued\n",
660 priv->bytes_in, priv->bytes_out, priv->cmd_count);
661} /* cypress_close */
662
663
664static int cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
665 const unsigned char *buf, int count)
666{
667 struct cypress_private *priv = usb_get_serial_port_data(port);
668
669 dev_dbg(&port->dev, "%s - %d bytes\n", __func__, count);
670
671 /* line control commands, which need to be executed immediately,
672 are not put into the buffer for obvious reasons.
673 */
674 if (priv->cmd_ctrl) {
675 count = 0;
676 goto finish;
677 }
678
679 if (!count)
680 return count;
681
682 count = kfifo_in_locked(&priv->write_fifo, buf, count, &priv->lock);
683
684finish:
685 cypress_send(port);
686
687 return count;
688} /* cypress_write */
689
690
691static void cypress_send(struct usb_serial_port *port)
692{
693 int count = 0, result, offset, actual_size;
694 struct cypress_private *priv = usb_get_serial_port_data(port);
695 struct device *dev = &port->dev;
696 unsigned long flags;
697
698 if (!priv->comm_is_ok)
699 return;
700
701 dev_dbg(dev, "%s - interrupt out size is %d\n", __func__,
702 port->interrupt_out_size);
703
704 spin_lock_irqsave(&priv->lock, flags);
705 if (priv->write_urb_in_use) {
706 dev_dbg(dev, "%s - can't write, urb in use\n", __func__);
707 spin_unlock_irqrestore(&priv->lock, flags);
708 return;
709 }
710 spin_unlock_irqrestore(&priv->lock, flags);
711
712 /* clear buffer */
713 memset(port->interrupt_out_urb->transfer_buffer, 0,
714 port->interrupt_out_size);
715
716 spin_lock_irqsave(&priv->lock, flags);
717 switch (priv->pkt_fmt) {
718 default:
719 case packet_format_1:
720 /* this is for the CY7C64013... */
721 offset = 2;
722 port->interrupt_out_buffer[0] = priv->line_control;
723 break;
724 case packet_format_2:
725 /* this is for the CY7C63743... */
726 offset = 1;
727 port->interrupt_out_buffer[0] = priv->line_control;
728 break;
729 }
730
731 if (priv->line_control & CONTROL_RESET)
732 priv->line_control &= ~CONTROL_RESET;
733
734 if (priv->cmd_ctrl) {
735 priv->cmd_count++;
736 dev_dbg(dev, "%s - line control command being issued\n", __func__);
737 spin_unlock_irqrestore(&priv->lock, flags);
738 goto send;
739 } else
740 spin_unlock_irqrestore(&priv->lock, flags);
741
742 count = kfifo_out_locked(&priv->write_fifo,
743 &port->interrupt_out_buffer[offset],
744 port->interrupt_out_size - offset,
745 &priv->lock);
746 if (count == 0)
747 return;
748
749 switch (priv->pkt_fmt) {
750 default:
751 case packet_format_1:
752 port->interrupt_out_buffer[1] = count;
753 break;
754 case packet_format_2:
755 port->interrupt_out_buffer[0] |= count;
756 }
757
758 dev_dbg(dev, "%s - count is %d\n", __func__, count);
759
760send:
761 spin_lock_irqsave(&priv->lock, flags);
762 priv->write_urb_in_use = 1;
763 spin_unlock_irqrestore(&priv->lock, flags);
764
765 if (priv->cmd_ctrl)
766 actual_size = 1;
767 else
768 actual_size = count +
769 (priv->pkt_fmt == packet_format_1 ? 2 : 1);
770
771 usb_serial_debug_data(dev, __func__, port->interrupt_out_size,
772 port->interrupt_out_urb->transfer_buffer);
773
774 usb_fill_int_urb(port->interrupt_out_urb, port->serial->dev,
775 usb_sndintpipe(port->serial->dev, port->interrupt_out_endpointAddress),
776 port->interrupt_out_buffer, port->interrupt_out_size,
777 cypress_write_int_callback, port, priv->write_urb_interval);
778 result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC);
779 if (result) {
780 dev_err_console(port,
781 "%s - failed submitting write urb, error %d\n",
782 __func__, result);
783 priv->write_urb_in_use = 0;
784 cypress_set_dead(port);
785 }
786
787 spin_lock_irqsave(&priv->lock, flags);
788 if (priv->cmd_ctrl)
789 priv->cmd_ctrl = 0;
790
791 /* do not count the line control and size bytes */
792 priv->bytes_out += count;
793 spin_unlock_irqrestore(&priv->lock, flags);
794
795 usb_serial_port_softint(port);
796} /* cypress_send */
797
798
799/* returns how much space is available in the soft buffer */
800static int cypress_write_room(struct tty_struct *tty)
801{
802 struct usb_serial_port *port = tty->driver_data;
803 struct cypress_private *priv = usb_get_serial_port_data(port);
804 int room = 0;
805 unsigned long flags;
806
807 spin_lock_irqsave(&priv->lock, flags);
808 room = kfifo_avail(&priv->write_fifo);
809 spin_unlock_irqrestore(&priv->lock, flags);
810
811 dev_dbg(&port->dev, "%s - returns %d\n", __func__, room);
812 return room;
813}
814
815
816static int cypress_tiocmget(struct tty_struct *tty)
817{
818 struct usb_serial_port *port = tty->driver_data;
819 struct cypress_private *priv = usb_get_serial_port_data(port);
820 __u8 status, control;
821 unsigned int result = 0;
822 unsigned long flags;
823
824 spin_lock_irqsave(&priv->lock, flags);
825 control = priv->line_control;
826 status = priv->current_status;
827 spin_unlock_irqrestore(&priv->lock, flags);
828
829 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
830 | ((control & CONTROL_RTS) ? TIOCM_RTS : 0)
831 | ((status & UART_CTS) ? TIOCM_CTS : 0)
832 | ((status & UART_DSR) ? TIOCM_DSR : 0)
833 | ((status & UART_RI) ? TIOCM_RI : 0)
834 | ((status & UART_CD) ? TIOCM_CD : 0);
835
836 dev_dbg(&port->dev, "%s - result = %x\n", __func__, result);
837
838 return result;
839}
840
841
842static int cypress_tiocmset(struct tty_struct *tty,
843 unsigned int set, unsigned int clear)
844{
845 struct usb_serial_port *port = tty->driver_data;
846 struct cypress_private *priv = usb_get_serial_port_data(port);
847 unsigned long flags;
848
849 spin_lock_irqsave(&priv->lock, flags);
850 if (set & TIOCM_RTS)
851 priv->line_control |= CONTROL_RTS;
852 if (set & TIOCM_DTR)
853 priv->line_control |= CONTROL_DTR;
854 if (clear & TIOCM_RTS)
855 priv->line_control &= ~CONTROL_RTS;
856 if (clear & TIOCM_DTR)
857 priv->line_control &= ~CONTROL_DTR;
858 priv->cmd_ctrl = 1;
859 spin_unlock_irqrestore(&priv->lock, flags);
860
861 return cypress_write(tty, port, NULL, 0);
862}
863
864static void cypress_set_termios(struct tty_struct *tty,
865 struct usb_serial_port *port, struct ktermios *old_termios)
866{
867 struct cypress_private *priv = usb_get_serial_port_data(port);
868 struct device *dev = &port->dev;
869 int data_bits, stop_bits, parity_type, parity_enable;
870 unsigned cflag, iflag;
871 unsigned long flags;
872 __u8 oldlines;
873 int linechange = 0;
874
875 spin_lock_irqsave(&priv->lock, flags);
876 /* We can't clean this one up as we don't know the device type
877 early enough */
878 if (!priv->termios_initialized) {
879 if (priv->chiptype == CT_EARTHMATE) {
880 tty->termios = tty_std_termios;
881 tty->termios.c_cflag = B4800 | CS8 | CREAD | HUPCL |
882 CLOCAL;
883 tty->termios.c_ispeed = 4800;
884 tty->termios.c_ospeed = 4800;
885 } else if (priv->chiptype == CT_CYPHIDCOM) {
886 tty->termios = tty_std_termios;
887 tty->termios.c_cflag = B9600 | CS8 | CREAD | HUPCL |
888 CLOCAL;
889 tty->termios.c_ispeed = 9600;
890 tty->termios.c_ospeed = 9600;
891 } else if (priv->chiptype == CT_CA42V2) {
892 tty->termios = tty_std_termios;
893 tty->termios.c_cflag = B9600 | CS8 | CREAD | HUPCL |
894 CLOCAL;
895 tty->termios.c_ispeed = 9600;
896 tty->termios.c_ospeed = 9600;
897 }
898 priv->termios_initialized = 1;
899 }
900 spin_unlock_irqrestore(&priv->lock, flags);
901
902 /* Unsupported features need clearing */
903 tty->termios.c_cflag &= ~(CMSPAR|CRTSCTS);
904
905 cflag = tty->termios.c_cflag;
906 iflag = tty->termios.c_iflag;
907
908 /* check if there are new settings */
909 if (old_termios) {
910 spin_lock_irqsave(&priv->lock, flags);
911 priv->tmp_termios = tty->termios;
912 spin_unlock_irqrestore(&priv->lock, flags);
913 }
914
915 /* set number of data bits, parity, stop bits */
916 /* when parity is disabled the parity type bit is ignored */
917
918 /* 1 means 2 stop bits, 0 means 1 stop bit */
919 stop_bits = cflag & CSTOPB ? 1 : 0;
920
921 if (cflag & PARENB) {
922 parity_enable = 1;
923 /* 1 means odd parity, 0 means even parity */
924 parity_type = cflag & PARODD ? 1 : 0;
925 } else
926 parity_enable = parity_type = 0;
927
928 switch (cflag & CSIZE) {
929 case CS5:
930 data_bits = 0;
931 break;
932 case CS6:
933 data_bits = 1;
934 break;
935 case CS7:
936 data_bits = 2;
937 break;
938 case CS8:
939 data_bits = 3;
940 break;
941 default:
942 dev_err(dev, "%s - CSIZE was set, but not CS5-CS8\n", __func__);
943 data_bits = 3;
944 }
945 spin_lock_irqsave(&priv->lock, flags);
946 oldlines = priv->line_control;
947 if ((cflag & CBAUD) == B0) {
948 /* drop dtr and rts */
949 dev_dbg(dev, "%s - dropping the lines, baud rate 0bps\n", __func__);
950 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
951 } else
952 priv->line_control = (CONTROL_DTR | CONTROL_RTS);
953 spin_unlock_irqrestore(&priv->lock, flags);
954
955 dev_dbg(dev, "%s - sending %d stop_bits, %d parity_enable, %d parity_type, %d data_bits (+5)\n",
956 __func__, stop_bits, parity_enable, parity_type, data_bits);
957
958 cypress_serial_control(tty, port, tty_get_baud_rate(tty),
959 data_bits, stop_bits,
960 parity_enable, parity_type,
961 0, CYPRESS_SET_CONFIG);
962
963 /* we perform a CYPRESS_GET_CONFIG so that the current settings are
964 * filled into the private structure this should confirm that all is
965 * working if it returns what we just set */
966 cypress_serial_control(tty, port, 0, 0, 0, 0, 0, 0, CYPRESS_GET_CONFIG);
967
968 /* Here we can define custom tty settings for devices; the main tty
969 * termios flag base comes from empeg.c */
970
971 spin_lock_irqsave(&priv->lock, flags);
972 if (priv->chiptype == CT_EARTHMATE && priv->baud_rate == 4800) {
973 dev_dbg(dev, "Using custom termios settings for a baud rate of 4800bps.\n");
974 /* define custom termios settings for NMEA protocol */
975
976 tty->termios.c_iflag /* input modes - */
977 &= ~(IGNBRK /* disable ignore break */
978 | BRKINT /* disable break causes interrupt */
979 | PARMRK /* disable mark parity errors */
980 | ISTRIP /* disable clear high bit of input char */
981 | INLCR /* disable translate NL to CR */
982 | IGNCR /* disable ignore CR */
983 | ICRNL /* disable translate CR to NL */
984 | IXON); /* disable enable XON/XOFF flow control */
985
986 tty->termios.c_oflag /* output modes */
987 &= ~OPOST; /* disable postprocess output char */
988
989 tty->termios.c_lflag /* line discipline modes */
990 &= ~(ECHO /* disable echo input characters */
991 | ECHONL /* disable echo new line */
992 | ICANON /* disable erase, kill, werase, and rprnt
993 special characters */
994 | ISIG /* disable interrupt, quit, and suspend
995 special characters */
996 | IEXTEN); /* disable non-POSIX special characters */
997 } /* CT_CYPHIDCOM: Application should handle this for device */
998
999 linechange = (priv->line_control != oldlines);
1000 spin_unlock_irqrestore(&priv->lock, flags);
1001
1002 /* if necessary, set lines */
1003 if (linechange) {
1004 priv->cmd_ctrl = 1;
1005 cypress_write(tty, port, NULL, 0);
1006 }
1007} /* cypress_set_termios */
1008
1009
1010/* returns amount of data still left in soft buffer */
1011static int cypress_chars_in_buffer(struct tty_struct *tty)
1012{
1013 struct usb_serial_port *port = tty->driver_data;
1014 struct cypress_private *priv = usb_get_serial_port_data(port);
1015 int chars = 0;
1016 unsigned long flags;
1017
1018 spin_lock_irqsave(&priv->lock, flags);
1019 chars = kfifo_len(&priv->write_fifo);
1020 spin_unlock_irqrestore(&priv->lock, flags);
1021
1022 dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
1023 return chars;
1024}
1025
1026
1027static void cypress_throttle(struct tty_struct *tty)
1028{
1029 struct usb_serial_port *port = tty->driver_data;
1030 struct cypress_private *priv = usb_get_serial_port_data(port);
1031
1032 spin_lock_irq(&priv->lock);
1033 priv->rx_flags = THROTTLED;
1034 spin_unlock_irq(&priv->lock);
1035}
1036
1037
1038static void cypress_unthrottle(struct tty_struct *tty)
1039{
1040 struct usb_serial_port *port = tty->driver_data;
1041 struct cypress_private *priv = usb_get_serial_port_data(port);
1042 int actually_throttled, result;
1043
1044 spin_lock_irq(&priv->lock);
1045 actually_throttled = priv->rx_flags & ACTUALLY_THROTTLED;
1046 priv->rx_flags = 0;
1047 spin_unlock_irq(&priv->lock);
1048
1049 if (!priv->comm_is_ok)
1050 return;
1051
1052 if (actually_throttled) {
1053 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
1054 if (result) {
1055 dev_err(&port->dev, "%s - failed submitting read urb, "
1056 "error %d\n", __func__, result);
1057 cypress_set_dead(port);
1058 }
1059 }
1060}
1061
1062
1063static void cypress_read_int_callback(struct urb *urb)
1064{
1065 struct usb_serial_port *port = urb->context;
1066 struct cypress_private *priv = usb_get_serial_port_data(port);
1067 struct device *dev = &urb->dev->dev;
1068 struct tty_struct *tty;
1069 unsigned char *data = urb->transfer_buffer;
1070 unsigned long flags;
1071 char tty_flag = TTY_NORMAL;
1072 int havedata = 0;
1073 int bytes = 0;
1074 int result;
1075 int i = 0;
1076 int status = urb->status;
1077
1078 switch (status) {
1079 case 0: /* success */
1080 break;
1081 case -ECONNRESET:
1082 case -ENOENT:
1083 case -ESHUTDOWN:
1084 /* precursor to disconnect so just go away */
1085 return;
1086 case -EPIPE:
1087 /* Can't call usb_clear_halt while in_interrupt */
1088 /* FALLS THROUGH */
1089 default:
1090 /* something ugly is going on... */
1091 dev_err(dev, "%s - unexpected nonzero read status received: %d\n",
1092 __func__, status);
1093 cypress_set_dead(port);
1094 return;
1095 }
1096
1097 spin_lock_irqsave(&priv->lock, flags);
1098 if (priv->rx_flags & THROTTLED) {
1099 dev_dbg(dev, "%s - now throttling\n", __func__);
1100 priv->rx_flags |= ACTUALLY_THROTTLED;
1101 spin_unlock_irqrestore(&priv->lock, flags);
1102 return;
1103 }
1104 spin_unlock_irqrestore(&priv->lock, flags);
1105
1106 tty = tty_port_tty_get(&port->port);
1107 if (!tty) {
1108 dev_dbg(dev, "%s - bad tty pointer - exiting\n", __func__);
1109 return;
1110 }
1111
1112 spin_lock_irqsave(&priv->lock, flags);
1113 result = urb->actual_length;
1114 switch (priv->pkt_fmt) {
1115 default:
1116 case packet_format_1:
1117 /* This is for the CY7C64013... */
1118 priv->current_status = data[0] & 0xF8;
1119 bytes = data[1] + 2;
1120 i = 2;
1121 if (bytes > 2)
1122 havedata = 1;
1123 break;
1124 case packet_format_2:
1125 /* This is for the CY7C63743... */
1126 priv->current_status = data[0] & 0xF8;
1127 bytes = (data[0] & 0x07) + 1;
1128 i = 1;
1129 if (bytes > 1)
1130 havedata = 1;
1131 break;
1132 }
1133 spin_unlock_irqrestore(&priv->lock, flags);
1134 if (result < bytes) {
1135 dev_dbg(dev,
1136 "%s - wrong packet size - received %d bytes but packet said %d bytes\n",
1137 __func__, result, bytes);
1138 goto continue_read;
1139 }
1140
1141 usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
1142
1143 spin_lock_irqsave(&priv->lock, flags);
1144 /* check to see if status has changed */
1145 if (priv->current_status != priv->prev_status) {
1146 u8 delta = priv->current_status ^ priv->prev_status;
1147
1148 if (delta & UART_MSR_MASK) {
1149 if (delta & UART_CTS)
1150 port->icount.cts++;
1151 if (delta & UART_DSR)
1152 port->icount.dsr++;
1153 if (delta & UART_RI)
1154 port->icount.rng++;
1155 if (delta & UART_CD)
1156 port->icount.dcd++;
1157
1158 wake_up_interruptible(&port->port.delta_msr_wait);
1159 }
1160
1161 priv->prev_status = priv->current_status;
1162 }
1163 spin_unlock_irqrestore(&priv->lock, flags);
1164
1165 /* hangup, as defined in acm.c... this might be a bad place for it
1166 * though */
1167 if (tty && !C_CLOCAL(tty) && !(priv->current_status & UART_CD)) {
1168 dev_dbg(dev, "%s - calling hangup\n", __func__);
1169 tty_hangup(tty);
1170 goto continue_read;
1171 }
1172
1173 /* There is one error bit... I'm assuming it is a parity error
1174 * indicator as the generic firmware will set this bit to 1 if a
1175 * parity error occurs.
1176 * I can not find reference to any other error events. */
1177 spin_lock_irqsave(&priv->lock, flags);
1178 if (priv->current_status & CYP_ERROR) {
1179 spin_unlock_irqrestore(&priv->lock, flags);
1180 tty_flag = TTY_PARITY;
1181 dev_dbg(dev, "%s - Parity Error detected\n", __func__);
1182 } else
1183 spin_unlock_irqrestore(&priv->lock, flags);
1184
1185 /* process read if there is data other than line status */
1186 if (bytes > i) {
1187 tty_insert_flip_string_fixed_flag(&port->port, data + i,
1188 tty_flag, bytes - i);
1189 tty_flip_buffer_push(&port->port);
1190 }
1191
1192 spin_lock_irqsave(&priv->lock, flags);
1193 /* control and status byte(s) are also counted */
1194 priv->bytes_in += bytes;
1195 spin_unlock_irqrestore(&priv->lock, flags);
1196
1197continue_read:
1198 tty_kref_put(tty);
1199
1200 /* Continue trying to always read */
1201
1202 if (priv->comm_is_ok) {
1203 usb_fill_int_urb(port->interrupt_in_urb, port->serial->dev,
1204 usb_rcvintpipe(port->serial->dev,
1205 port->interrupt_in_endpointAddress),
1206 port->interrupt_in_urb->transfer_buffer,
1207 port->interrupt_in_urb->transfer_buffer_length,
1208 cypress_read_int_callback, port,
1209 priv->read_urb_interval);
1210 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
1211 if (result && result != -EPERM) {
1212 dev_err(dev, "%s - failed resubmitting read urb, error %d\n",
1213 __func__, result);
1214 cypress_set_dead(port);
1215 }
1216 }
1217} /* cypress_read_int_callback */
1218
1219
1220static void cypress_write_int_callback(struct urb *urb)
1221{
1222 struct usb_serial_port *port = urb->context;
1223 struct cypress_private *priv = usb_get_serial_port_data(port);
1224 struct device *dev = &urb->dev->dev;
1225 int status = urb->status;
1226
1227 switch (status) {
1228 case 0:
1229 /* success */
1230 break;
1231 case -ECONNRESET:
1232 case -ENOENT:
1233 case -ESHUTDOWN:
1234 /* this urb is terminated, clean up */
1235 dev_dbg(dev, "%s - urb shutting down with status: %d\n",
1236 __func__, status);
1237 priv->write_urb_in_use = 0;
1238 return;
1239 case -EPIPE:
1240 /* Cannot call usb_clear_halt while in_interrupt */
1241 /* FALLTHROUGH */
1242 default:
1243 dev_err(dev, "%s - unexpected nonzero write status received: %d\n",
1244 __func__, status);
1245 cypress_set_dead(port);
1246 break;
1247 }
1248 priv->write_urb_in_use = 0;
1249
1250 /* send any buffered data */
1251 cypress_send(port);
1252}
1253
1254module_usb_serial_driver(serial_drivers, id_table_combined);
1255
1256MODULE_AUTHOR(DRIVER_AUTHOR);
1257MODULE_DESCRIPTION(DRIVER_DESC);
1258MODULE_LICENSE("GPL");
1259
1260module_param(stats, bool, S_IRUGO | S_IWUSR);
1261MODULE_PARM_DESC(stats, "Enable statistics or not");
1262module_param(interval, int, S_IRUGO | S_IWUSR);
1263MODULE_PARM_DESC(interval, "Overrides interrupt interval");
1264module_param(unstable_bauds, bool, S_IRUGO | S_IWUSR);
1265MODULE_PARM_DESC(unstable_bauds, "Allow unstable baud rates");
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * USB Cypress M8 driver
4 *
5 * Copyright (C) 2004
6 * Lonnie Mendez (dignome@gmail.com)
7 * Copyright (C) 2003,2004
8 * Neil Whelchel (koyama@firstlight.net)
9 *
10 * See Documentation/usb/usb-serial.rst for more information on using this
11 * driver
12 *
13 * See http://geocities.com/i0xox0i for information on this driver and the
14 * earthmate usb device.
15 */
16
17/* Thanks to Neil Whelchel for writing the first cypress m8 implementation
18 for linux. */
19/* Thanks to cypress for providing references for the hid reports. */
20/* Thanks to Jiang Zhang for providing links and for general help. */
21/* Code originates and was built up from ftdi_sio, belkin, pl2303 and others.*/
22
23
24#include <linux/kernel.h>
25#include <linux/errno.h>
26#include <linux/slab.h>
27#include <linux/tty.h>
28#include <linux/tty_driver.h>
29#include <linux/tty_flip.h>
30#include <linux/module.h>
31#include <linux/moduleparam.h>
32#include <linux/spinlock.h>
33#include <linux/usb.h>
34#include <linux/usb/serial.h>
35#include <linux/serial.h>
36#include <linux/kfifo.h>
37#include <linux/delay.h>
38#include <linux/uaccess.h>
39#include <asm/unaligned.h>
40
41#include "cypress_m8.h"
42
43
44static bool stats;
45static int interval;
46static bool unstable_bauds;
47
48#define DRIVER_AUTHOR "Lonnie Mendez <dignome@gmail.com>, Neil Whelchel <koyama@firstlight.net>"
49#define DRIVER_DESC "Cypress USB to Serial Driver"
50
51/* write buffer size defines */
52#define CYPRESS_BUF_SIZE 1024
53
54static const struct usb_device_id id_table_earthmate[] = {
55 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
56 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
57 { } /* Terminating entry */
58};
59
60static const struct usb_device_id id_table_cyphidcomrs232[] = {
61 { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
62 { USB_DEVICE(VENDOR_ID_SAI, PRODUCT_ID_CYPHIDCOM) },
63 { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) },
64 { USB_DEVICE(VENDOR_ID_FRWD, PRODUCT_ID_CYPHIDCOM_FRWD) },
65 { } /* Terminating entry */
66};
67
68static const struct usb_device_id id_table_nokiaca42v2[] = {
69 { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
70 { } /* Terminating entry */
71};
72
73static const struct usb_device_id id_table_combined[] = {
74 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
75 { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
76 { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
77 { USB_DEVICE(VENDOR_ID_SAI, PRODUCT_ID_CYPHIDCOM) },
78 { USB_DEVICE(VENDOR_ID_POWERCOM, PRODUCT_ID_UPS) },
79 { USB_DEVICE(VENDOR_ID_FRWD, PRODUCT_ID_CYPHIDCOM_FRWD) },
80 { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
81 { } /* Terminating entry */
82};
83
84MODULE_DEVICE_TABLE(usb, id_table_combined);
85
86enum packet_format {
87 packet_format_1, /* b0:status, b1:payload count */
88 packet_format_2 /* b0[7:3]:status, b0[2:0]:payload count */
89};
90
91struct cypress_private {
92 spinlock_t lock; /* private lock */
93 int chiptype; /* identifier of device, for quirks/etc */
94 int bytes_in; /* used for statistics */
95 int bytes_out; /* used for statistics */
96 int cmd_count; /* used for statistics */
97 int cmd_ctrl; /* always set this to 1 before issuing a command */
98 struct kfifo write_fifo; /* write fifo */
99 int write_urb_in_use; /* write urb in use indicator */
100 int write_urb_interval; /* interval to use for write urb */
101 int read_urb_interval; /* interval to use for read urb */
102 int comm_is_ok; /* true if communication is (still) ok */
103 __u8 line_control; /* holds dtr / rts value */
104 __u8 current_status; /* received from last read - info on dsr,cts,cd,ri,etc */
105 __u8 current_config; /* stores the current configuration byte */
106 __u8 rx_flags; /* throttling - used from whiteheat/ftdi_sio */
107 enum packet_format pkt_fmt; /* format to use for packet send / receive */
108 int get_cfg_unsafe; /* If true, the CYPRESS_GET_CONFIG is unsafe */
109 int baud_rate; /* stores current baud rate in
110 integer form */
111 char prev_status; /* used for TIOCMIWAIT */
112};
113
114/* function prototypes for the Cypress USB to serial device */
115static int cypress_earthmate_port_probe(struct usb_serial_port *port);
116static int cypress_hidcom_port_probe(struct usb_serial_port *port);
117static int cypress_ca42v2_port_probe(struct usb_serial_port *port);
118static void cypress_port_remove(struct usb_serial_port *port);
119static int cypress_open(struct tty_struct *tty, struct usb_serial_port *port);
120static void cypress_close(struct usb_serial_port *port);
121static void cypress_dtr_rts(struct usb_serial_port *port, int on);
122static int cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
123 const unsigned char *buf, int count);
124static void cypress_send(struct usb_serial_port *port);
125static unsigned int cypress_write_room(struct tty_struct *tty);
126static void cypress_earthmate_init_termios(struct tty_struct *tty);
127static void cypress_set_termios(struct tty_struct *tty,
128 struct usb_serial_port *port, struct ktermios *old);
129static int cypress_tiocmget(struct tty_struct *tty);
130static int cypress_tiocmset(struct tty_struct *tty,
131 unsigned int set, unsigned int clear);
132static unsigned int cypress_chars_in_buffer(struct tty_struct *tty);
133static void cypress_throttle(struct tty_struct *tty);
134static void cypress_unthrottle(struct tty_struct *tty);
135static void cypress_set_dead(struct usb_serial_port *port);
136static void cypress_read_int_callback(struct urb *urb);
137static void cypress_write_int_callback(struct urb *urb);
138
139static struct usb_serial_driver cypress_earthmate_device = {
140 .driver = {
141 .owner = THIS_MODULE,
142 .name = "earthmate",
143 },
144 .description = "DeLorme Earthmate USB",
145 .id_table = id_table_earthmate,
146 .num_ports = 1,
147 .port_probe = cypress_earthmate_port_probe,
148 .port_remove = cypress_port_remove,
149 .open = cypress_open,
150 .close = cypress_close,
151 .dtr_rts = cypress_dtr_rts,
152 .write = cypress_write,
153 .write_room = cypress_write_room,
154 .init_termios = cypress_earthmate_init_termios,
155 .set_termios = cypress_set_termios,
156 .tiocmget = cypress_tiocmget,
157 .tiocmset = cypress_tiocmset,
158 .tiocmiwait = usb_serial_generic_tiocmiwait,
159 .chars_in_buffer = cypress_chars_in_buffer,
160 .throttle = cypress_throttle,
161 .unthrottle = cypress_unthrottle,
162 .read_int_callback = cypress_read_int_callback,
163 .write_int_callback = cypress_write_int_callback,
164};
165
166static struct usb_serial_driver cypress_hidcom_device = {
167 .driver = {
168 .owner = THIS_MODULE,
169 .name = "cyphidcom",
170 },
171 .description = "HID->COM RS232 Adapter",
172 .id_table = id_table_cyphidcomrs232,
173 .num_ports = 1,
174 .port_probe = cypress_hidcom_port_probe,
175 .port_remove = cypress_port_remove,
176 .open = cypress_open,
177 .close = cypress_close,
178 .dtr_rts = cypress_dtr_rts,
179 .write = cypress_write,
180 .write_room = cypress_write_room,
181 .set_termios = cypress_set_termios,
182 .tiocmget = cypress_tiocmget,
183 .tiocmset = cypress_tiocmset,
184 .tiocmiwait = usb_serial_generic_tiocmiwait,
185 .chars_in_buffer = cypress_chars_in_buffer,
186 .throttle = cypress_throttle,
187 .unthrottle = cypress_unthrottle,
188 .read_int_callback = cypress_read_int_callback,
189 .write_int_callback = cypress_write_int_callback,
190};
191
192static struct usb_serial_driver cypress_ca42v2_device = {
193 .driver = {
194 .owner = THIS_MODULE,
195 .name = "nokiaca42v2",
196 },
197 .description = "Nokia CA-42 V2 Adapter",
198 .id_table = id_table_nokiaca42v2,
199 .num_ports = 1,
200 .port_probe = cypress_ca42v2_port_probe,
201 .port_remove = cypress_port_remove,
202 .open = cypress_open,
203 .close = cypress_close,
204 .dtr_rts = cypress_dtr_rts,
205 .write = cypress_write,
206 .write_room = cypress_write_room,
207 .set_termios = cypress_set_termios,
208 .tiocmget = cypress_tiocmget,
209 .tiocmset = cypress_tiocmset,
210 .tiocmiwait = usb_serial_generic_tiocmiwait,
211 .chars_in_buffer = cypress_chars_in_buffer,
212 .throttle = cypress_throttle,
213 .unthrottle = cypress_unthrottle,
214 .read_int_callback = cypress_read_int_callback,
215 .write_int_callback = cypress_write_int_callback,
216};
217
218static struct usb_serial_driver * const serial_drivers[] = {
219 &cypress_earthmate_device, &cypress_hidcom_device,
220 &cypress_ca42v2_device, NULL
221};
222
223/*****************************************************************************
224 * Cypress serial helper functions
225 *****************************************************************************/
226
227/* FRWD Dongle hidcom needs to skip reset and speed checks */
228static inline bool is_frwd(struct usb_device *dev)
229{
230 return ((le16_to_cpu(dev->descriptor.idVendor) == VENDOR_ID_FRWD) &&
231 (le16_to_cpu(dev->descriptor.idProduct) == PRODUCT_ID_CYPHIDCOM_FRWD));
232}
233
234static int analyze_baud_rate(struct usb_serial_port *port, speed_t new_rate)
235{
236 struct cypress_private *priv;
237 priv = usb_get_serial_port_data(port);
238
239 if (unstable_bauds)
240 return new_rate;
241
242 /* FRWD Dongle uses 115200 bps */
243 if (is_frwd(port->serial->dev))
244 return new_rate;
245
246 /*
247 * The general purpose firmware for the Cypress M8 allows for
248 * a maximum speed of 57600bps (I have no idea whether DeLorme
249 * chose to use the general purpose firmware or not), if you
250 * need to modify this speed setting for your own project
251 * please add your own chiptype and modify the code likewise.
252 * The Cypress HID->COM device will work successfully up to
253 * 115200bps (but the actual throughput is around 3kBps).
254 */
255 if (port->serial->dev->speed == USB_SPEED_LOW) {
256 /*
257 * Mike Isely <isely@pobox.com> 2-Feb-2008: The
258 * Cypress app note that describes this mechanism
259 * states the the low-speed part can't handle more
260 * than 800 bytes/sec, in which case 4800 baud is the
261 * safest speed for a part like that.
262 */
263 if (new_rate > 4800) {
264 dev_dbg(&port->dev,
265 "%s - failed setting baud rate, device incapable speed %d\n",
266 __func__, new_rate);
267 return -1;
268 }
269 }
270 switch (priv->chiptype) {
271 case CT_EARTHMATE:
272 if (new_rate <= 600) {
273 /* 300 and 600 baud rates are supported under
274 * the generic firmware, but are not used with
275 * NMEA and SiRF protocols */
276 dev_dbg(&port->dev,
277 "%s - failed setting baud rate, unsupported speed of %d on Earthmate GPS\n",
278 __func__, new_rate);
279 return -1;
280 }
281 break;
282 default:
283 break;
284 }
285 return new_rate;
286}
287
288
289/* This function can either set or retrieve the current serial line settings */
290static int cypress_serial_control(struct tty_struct *tty,
291 struct usb_serial_port *port, speed_t baud_rate, int data_bits,
292 int stop_bits, int parity_enable, int parity_type, int reset,
293 int cypress_request_type)
294{
295 int new_baudrate = 0, retval = 0, tries = 0;
296 struct cypress_private *priv;
297 struct device *dev = &port->dev;
298 u8 *feature_buffer;
299 const unsigned int feature_len = 5;
300 unsigned long flags;
301
302 priv = usb_get_serial_port_data(port);
303
304 if (!priv->comm_is_ok)
305 return -ENODEV;
306
307 feature_buffer = kcalloc(feature_len, sizeof(u8), GFP_KERNEL);
308 if (!feature_buffer)
309 return -ENOMEM;
310
311 switch (cypress_request_type) {
312 case CYPRESS_SET_CONFIG:
313 /* 0 means 'Hang up' so doesn't change the true bit rate */
314 new_baudrate = priv->baud_rate;
315 if (baud_rate && baud_rate != priv->baud_rate) {
316 dev_dbg(dev, "%s - baud rate is changing\n", __func__);
317 retval = analyze_baud_rate(port, baud_rate);
318 if (retval >= 0) {
319 new_baudrate = retval;
320 dev_dbg(dev, "%s - New baud rate set to %d\n",
321 __func__, new_baudrate);
322 }
323 }
324 dev_dbg(dev, "%s - baud rate is being sent as %d\n", __func__,
325 new_baudrate);
326
327 /* fill the feature_buffer with new configuration */
328 put_unaligned_le32(new_baudrate, feature_buffer);
329 feature_buffer[4] |= data_bits - 5; /* assign data bits in 2 bit space ( max 3 ) */
330 /* 1 bit gap */
331 feature_buffer[4] |= (stop_bits << 3); /* assign stop bits in 1 bit space */
332 feature_buffer[4] |= (parity_enable << 4); /* assign parity flag in 1 bit space */
333 feature_buffer[4] |= (parity_type << 5); /* assign parity type in 1 bit space */
334 /* 1 bit gap */
335 feature_buffer[4] |= (reset << 7); /* assign reset at end of byte, 1 bit space */
336
337 dev_dbg(dev, "%s - device is being sent this feature report:\n", __func__);
338 dev_dbg(dev, "%s - %02X - %02X - %02X - %02X - %02X\n", __func__,
339 feature_buffer[0], feature_buffer[1],
340 feature_buffer[2], feature_buffer[3],
341 feature_buffer[4]);
342
343 do {
344 retval = usb_control_msg(port->serial->dev,
345 usb_sndctrlpipe(port->serial->dev, 0),
346 HID_REQ_SET_REPORT,
347 USB_DIR_OUT | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
348 0x0300, 0, feature_buffer,
349 feature_len, 500);
350
351 if (tries++ >= 3)
352 break;
353
354 } while (retval != feature_len &&
355 retval != -ENODEV);
356
357 if (retval != feature_len) {
358 dev_err(dev, "%s - failed sending serial line settings - %d\n",
359 __func__, retval);
360 cypress_set_dead(port);
361 } else {
362 spin_lock_irqsave(&priv->lock, flags);
363 priv->baud_rate = new_baudrate;
364 priv->current_config = feature_buffer[4];
365 spin_unlock_irqrestore(&priv->lock, flags);
366 /* If we asked for a speed change encode it */
367 if (baud_rate)
368 tty_encode_baud_rate(tty,
369 new_baudrate, new_baudrate);
370 }
371 break;
372 case CYPRESS_GET_CONFIG:
373 if (priv->get_cfg_unsafe) {
374 /* Not implemented for this device,
375 and if we try to do it we're likely
376 to crash the hardware. */
377 retval = -ENOTTY;
378 goto out;
379 }
380 dev_dbg(dev, "%s - retrieving serial line settings\n", __func__);
381 do {
382 retval = usb_control_msg(port->serial->dev,
383 usb_rcvctrlpipe(port->serial->dev, 0),
384 HID_REQ_GET_REPORT,
385 USB_DIR_IN | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
386 0x0300, 0, feature_buffer,
387 feature_len, 500);
388
389 if (tries++ >= 3)
390 break;
391 } while (retval != feature_len
392 && retval != -ENODEV);
393
394 if (retval != feature_len) {
395 dev_err(dev, "%s - failed to retrieve serial line settings - %d\n",
396 __func__, retval);
397 cypress_set_dead(port);
398 goto out;
399 } else {
400 spin_lock_irqsave(&priv->lock, flags);
401 /* store the config in one byte, and later
402 use bit masks to check values */
403 priv->current_config = feature_buffer[4];
404 priv->baud_rate = get_unaligned_le32(feature_buffer);
405 spin_unlock_irqrestore(&priv->lock, flags);
406 }
407 }
408 spin_lock_irqsave(&priv->lock, flags);
409 ++priv->cmd_count;
410 spin_unlock_irqrestore(&priv->lock, flags);
411out:
412 kfree(feature_buffer);
413 return retval;
414} /* cypress_serial_control */
415
416
417static void cypress_set_dead(struct usb_serial_port *port)
418{
419 struct cypress_private *priv = usb_get_serial_port_data(port);
420 unsigned long flags;
421
422 spin_lock_irqsave(&priv->lock, flags);
423 if (!priv->comm_is_ok) {
424 spin_unlock_irqrestore(&priv->lock, flags);
425 return;
426 }
427 priv->comm_is_ok = 0;
428 spin_unlock_irqrestore(&priv->lock, flags);
429
430 dev_err(&port->dev, "cypress_m8 suspending failing port %d - "
431 "interval might be too short\n", port->port_number);
432}
433
434
435/*****************************************************************************
436 * Cypress serial driver functions
437 *****************************************************************************/
438
439
440static int cypress_generic_port_probe(struct usb_serial_port *port)
441{
442 struct usb_serial *serial = port->serial;
443 struct cypress_private *priv;
444
445 if (!port->interrupt_out_urb || !port->interrupt_in_urb) {
446 dev_err(&port->dev, "required endpoint is missing\n");
447 return -ENODEV;
448 }
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->rx_flags = 0;
470 /* Default packet format setting is determined by packet size.
471 Anything with a size larger then 9 must have a separate
472 count field since the 3 bit count field is otherwise too
473 small. Otherwise we can use the slightly more compact
474 format. This is in accordance with the cypress_m8 serial
475 converter app note. */
476 if (port->interrupt_out_size > 9)
477 priv->pkt_fmt = packet_format_1;
478 else
479 priv->pkt_fmt = packet_format_2;
480
481 if (interval > 0) {
482 priv->write_urb_interval = interval;
483 priv->read_urb_interval = interval;
484 dev_dbg(&port->dev, "%s - read & write intervals forced to %d\n",
485 __func__, interval);
486 } else {
487 priv->write_urb_interval = port->interrupt_out_urb->interval;
488 priv->read_urb_interval = port->interrupt_in_urb->interval;
489 dev_dbg(&port->dev, "%s - intervals: read=%d write=%d\n",
490 __func__, priv->read_urb_interval,
491 priv->write_urb_interval);
492 }
493 usb_set_serial_port_data(port, priv);
494
495 port->port.drain_delay = 256;
496
497 return 0;
498}
499
500
501static int cypress_earthmate_port_probe(struct usb_serial_port *port)
502{
503 struct usb_serial *serial = port->serial;
504 struct cypress_private *priv;
505 int ret;
506
507 ret = cypress_generic_port_probe(port);
508 if (ret) {
509 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
510 return ret;
511 }
512
513 priv = usb_get_serial_port_data(port);
514 priv->chiptype = CT_EARTHMATE;
515 /* All Earthmate devices use the separated-count packet
516 format! Idiotic. */
517 priv->pkt_fmt = packet_format_1;
518 if (serial->dev->descriptor.idProduct !=
519 cpu_to_le16(PRODUCT_ID_EARTHMATEUSB)) {
520 /* The old original USB Earthmate seemed able to
521 handle GET_CONFIG requests; everything they've
522 produced since that time crashes if this command is
523 attempted :-( */
524 dev_dbg(&port->dev,
525 "%s - Marking this device as unsafe for GET_CONFIG commands\n",
526 __func__);
527 priv->get_cfg_unsafe = !0;
528 }
529
530 return 0;
531}
532
533static int cypress_hidcom_port_probe(struct usb_serial_port *port)
534{
535 struct cypress_private *priv;
536 int ret;
537
538 ret = cypress_generic_port_probe(port);
539 if (ret) {
540 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
541 return ret;
542 }
543
544 priv = usb_get_serial_port_data(port);
545 priv->chiptype = CT_CYPHIDCOM;
546
547 return 0;
548}
549
550static int cypress_ca42v2_port_probe(struct usb_serial_port *port)
551{
552 struct cypress_private *priv;
553 int ret;
554
555 ret = cypress_generic_port_probe(port);
556 if (ret) {
557 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
558 return ret;
559 }
560
561 priv = usb_get_serial_port_data(port);
562 priv->chiptype = CT_CA42V2;
563
564 return 0;
565}
566
567static void cypress_port_remove(struct usb_serial_port *port)
568{
569 struct cypress_private *priv;
570
571 priv = usb_get_serial_port_data(port);
572
573 kfifo_free(&priv->write_fifo);
574 kfree(priv);
575}
576
577static int cypress_open(struct tty_struct *tty, struct usb_serial_port *port)
578{
579 struct cypress_private *priv = usb_get_serial_port_data(port);
580 struct usb_serial *serial = port->serial;
581 unsigned long flags;
582 int result = 0;
583
584 if (!priv->comm_is_ok)
585 return -EIO;
586
587 /* clear halts before open */
588 usb_clear_halt(serial->dev, 0x81);
589 usb_clear_halt(serial->dev, 0x02);
590
591 spin_lock_irqsave(&priv->lock, flags);
592 /* reset read/write statistics */
593 priv->bytes_in = 0;
594 priv->bytes_out = 0;
595 priv->cmd_count = 0;
596 priv->rx_flags = 0;
597 spin_unlock_irqrestore(&priv->lock, flags);
598
599 /* Set termios */
600 cypress_send(port);
601
602 if (tty)
603 cypress_set_termios(tty, port, NULL);
604
605 /* setup the port and start reading from the device */
606 usb_fill_int_urb(port->interrupt_in_urb, serial->dev,
607 usb_rcvintpipe(serial->dev, port->interrupt_in_endpointAddress),
608 port->interrupt_in_urb->transfer_buffer,
609 port->interrupt_in_urb->transfer_buffer_length,
610 cypress_read_int_callback, port, priv->read_urb_interval);
611 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
612
613 if (result) {
614 dev_err(&port->dev,
615 "%s - failed submitting read urb, error %d\n",
616 __func__, result);
617 cypress_set_dead(port);
618 }
619
620 return result;
621} /* cypress_open */
622
623static void cypress_dtr_rts(struct usb_serial_port *port, int on)
624{
625 struct cypress_private *priv = usb_get_serial_port_data(port);
626 /* drop dtr and rts */
627 spin_lock_irq(&priv->lock);
628 if (on == 0)
629 priv->line_control = 0;
630 else
631 priv->line_control = CONTROL_DTR | CONTROL_RTS;
632 priv->cmd_ctrl = 1;
633 spin_unlock_irq(&priv->lock);
634 cypress_write(NULL, port, NULL, 0);
635}
636
637static void cypress_close(struct usb_serial_port *port)
638{
639 struct cypress_private *priv = usb_get_serial_port_data(port);
640 unsigned long flags;
641
642 spin_lock_irqsave(&priv->lock, flags);
643 kfifo_reset_out(&priv->write_fifo);
644 spin_unlock_irqrestore(&priv->lock, flags);
645
646 dev_dbg(&port->dev, "%s - stopping urbs\n", __func__);
647 usb_kill_urb(port->interrupt_in_urb);
648 usb_kill_urb(port->interrupt_out_urb);
649
650 if (stats)
651 dev_info(&port->dev, "Statistics: %d Bytes In | %d Bytes Out | %d Commands Issued\n",
652 priv->bytes_in, priv->bytes_out, priv->cmd_count);
653} /* cypress_close */
654
655
656static int cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
657 const unsigned char *buf, int count)
658{
659 struct cypress_private *priv = usb_get_serial_port_data(port);
660
661 dev_dbg(&port->dev, "%s - %d bytes\n", __func__, count);
662
663 /* line control commands, which need to be executed immediately,
664 are not put into the buffer for obvious reasons.
665 */
666 if (priv->cmd_ctrl) {
667 count = 0;
668 goto finish;
669 }
670
671 if (!count)
672 return count;
673
674 count = kfifo_in_locked(&priv->write_fifo, buf, count, &priv->lock);
675
676finish:
677 cypress_send(port);
678
679 return count;
680} /* cypress_write */
681
682
683static void cypress_send(struct usb_serial_port *port)
684{
685 int count = 0, result, offset, actual_size;
686 struct cypress_private *priv = usb_get_serial_port_data(port);
687 struct device *dev = &port->dev;
688 unsigned long flags;
689
690 if (!priv->comm_is_ok)
691 return;
692
693 dev_dbg(dev, "%s - interrupt out size is %d\n", __func__,
694 port->interrupt_out_size);
695
696 spin_lock_irqsave(&priv->lock, flags);
697 if (priv->write_urb_in_use) {
698 dev_dbg(dev, "%s - can't write, urb in use\n", __func__);
699 spin_unlock_irqrestore(&priv->lock, flags);
700 return;
701 }
702 spin_unlock_irqrestore(&priv->lock, flags);
703
704 /* clear buffer */
705 memset(port->interrupt_out_urb->transfer_buffer, 0,
706 port->interrupt_out_size);
707
708 spin_lock_irqsave(&priv->lock, flags);
709 switch (priv->pkt_fmt) {
710 default:
711 case packet_format_1:
712 /* this is for the CY7C64013... */
713 offset = 2;
714 port->interrupt_out_buffer[0] = priv->line_control;
715 break;
716 case packet_format_2:
717 /* this is for the CY7C63743... */
718 offset = 1;
719 port->interrupt_out_buffer[0] = priv->line_control;
720 break;
721 }
722
723 if (priv->line_control & CONTROL_RESET)
724 priv->line_control &= ~CONTROL_RESET;
725
726 if (priv->cmd_ctrl) {
727 priv->cmd_count++;
728 dev_dbg(dev, "%s - line control command being issued\n", __func__);
729 spin_unlock_irqrestore(&priv->lock, flags);
730 goto send;
731 } else
732 spin_unlock_irqrestore(&priv->lock, flags);
733
734 count = kfifo_out_locked(&priv->write_fifo,
735 &port->interrupt_out_buffer[offset],
736 port->interrupt_out_size - offset,
737 &priv->lock);
738 if (count == 0)
739 return;
740
741 switch (priv->pkt_fmt) {
742 default:
743 case packet_format_1:
744 port->interrupt_out_buffer[1] = count;
745 break;
746 case packet_format_2:
747 port->interrupt_out_buffer[0] |= count;
748 }
749
750 dev_dbg(dev, "%s - count is %d\n", __func__, count);
751
752send:
753 spin_lock_irqsave(&priv->lock, flags);
754 priv->write_urb_in_use = 1;
755 spin_unlock_irqrestore(&priv->lock, flags);
756
757 if (priv->cmd_ctrl)
758 actual_size = 1;
759 else
760 actual_size = count +
761 (priv->pkt_fmt == packet_format_1 ? 2 : 1);
762
763 usb_serial_debug_data(dev, __func__, port->interrupt_out_size,
764 port->interrupt_out_urb->transfer_buffer);
765
766 usb_fill_int_urb(port->interrupt_out_urb, port->serial->dev,
767 usb_sndintpipe(port->serial->dev, port->interrupt_out_endpointAddress),
768 port->interrupt_out_buffer, actual_size,
769 cypress_write_int_callback, port, priv->write_urb_interval);
770 result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC);
771 if (result) {
772 dev_err_console(port,
773 "%s - failed submitting write urb, error %d\n",
774 __func__, result);
775 priv->write_urb_in_use = 0;
776 cypress_set_dead(port);
777 }
778
779 spin_lock_irqsave(&priv->lock, flags);
780 if (priv->cmd_ctrl)
781 priv->cmd_ctrl = 0;
782
783 /* do not count the line control and size bytes */
784 priv->bytes_out += count;
785 spin_unlock_irqrestore(&priv->lock, flags);
786
787 usb_serial_port_softint(port);
788} /* cypress_send */
789
790
791/* returns how much space is available in the soft buffer */
792static unsigned int cypress_write_room(struct tty_struct *tty)
793{
794 struct usb_serial_port *port = tty->driver_data;
795 struct cypress_private *priv = usb_get_serial_port_data(port);
796 unsigned int room;
797 unsigned long flags;
798
799 spin_lock_irqsave(&priv->lock, flags);
800 room = kfifo_avail(&priv->write_fifo);
801 spin_unlock_irqrestore(&priv->lock, flags);
802
803 dev_dbg(&port->dev, "%s - returns %u\n", __func__, room);
804 return room;
805}
806
807
808static int cypress_tiocmget(struct tty_struct *tty)
809{
810 struct usb_serial_port *port = tty->driver_data;
811 struct cypress_private *priv = usb_get_serial_port_data(port);
812 __u8 status, control;
813 unsigned int result = 0;
814 unsigned long flags;
815
816 spin_lock_irqsave(&priv->lock, flags);
817 control = priv->line_control;
818 status = priv->current_status;
819 spin_unlock_irqrestore(&priv->lock, flags);
820
821 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
822 | ((control & CONTROL_RTS) ? TIOCM_RTS : 0)
823 | ((status & UART_CTS) ? TIOCM_CTS : 0)
824 | ((status & UART_DSR) ? TIOCM_DSR : 0)
825 | ((status & UART_RI) ? TIOCM_RI : 0)
826 | ((status & UART_CD) ? TIOCM_CD : 0);
827
828 dev_dbg(&port->dev, "%s - result = %x\n", __func__, result);
829
830 return result;
831}
832
833
834static int cypress_tiocmset(struct tty_struct *tty,
835 unsigned int set, unsigned int clear)
836{
837 struct usb_serial_port *port = tty->driver_data;
838 struct cypress_private *priv = usb_get_serial_port_data(port);
839 unsigned long flags;
840
841 spin_lock_irqsave(&priv->lock, flags);
842 if (set & TIOCM_RTS)
843 priv->line_control |= CONTROL_RTS;
844 if (set & TIOCM_DTR)
845 priv->line_control |= CONTROL_DTR;
846 if (clear & TIOCM_RTS)
847 priv->line_control &= ~CONTROL_RTS;
848 if (clear & TIOCM_DTR)
849 priv->line_control &= ~CONTROL_DTR;
850 priv->cmd_ctrl = 1;
851 spin_unlock_irqrestore(&priv->lock, flags);
852
853 return cypress_write(tty, port, NULL, 0);
854}
855
856static void cypress_earthmate_init_termios(struct tty_struct *tty)
857{
858 tty_encode_baud_rate(tty, 4800, 4800);
859}
860
861static void cypress_set_termios(struct tty_struct *tty,
862 struct usb_serial_port *port, struct ktermios *old_termios)
863{
864 struct cypress_private *priv = usb_get_serial_port_data(port);
865 struct device *dev = &port->dev;
866 int data_bits, stop_bits, parity_type, parity_enable;
867 unsigned int cflag;
868 unsigned long flags;
869 __u8 oldlines;
870 int linechange = 0;
871
872 /* Unsupported features need clearing */
873 tty->termios.c_cflag &= ~(CMSPAR|CRTSCTS);
874
875 cflag = tty->termios.c_cflag;
876
877 /* set number of data bits, parity, stop bits */
878 /* when parity is disabled the parity type bit is ignored */
879
880 /* 1 means 2 stop bits, 0 means 1 stop bit */
881 stop_bits = cflag & CSTOPB ? 1 : 0;
882
883 if (cflag & PARENB) {
884 parity_enable = 1;
885 /* 1 means odd parity, 0 means even parity */
886 parity_type = cflag & PARODD ? 1 : 0;
887 } else
888 parity_enable = parity_type = 0;
889
890 data_bits = tty_get_char_size(cflag);
891
892 spin_lock_irqsave(&priv->lock, flags);
893 oldlines = priv->line_control;
894 if ((cflag & CBAUD) == B0) {
895 /* drop dtr and rts */
896 dev_dbg(dev, "%s - dropping the lines, baud rate 0bps\n", __func__);
897 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
898 } else
899 priv->line_control = (CONTROL_DTR | CONTROL_RTS);
900 spin_unlock_irqrestore(&priv->lock, flags);
901
902 dev_dbg(dev, "%s - sending %d stop_bits, %d parity_enable, %d parity_type, %d data_bits (+5)\n",
903 __func__, stop_bits, parity_enable, parity_type, data_bits);
904
905 cypress_serial_control(tty, port, tty_get_baud_rate(tty),
906 data_bits, stop_bits,
907 parity_enable, parity_type,
908 0, CYPRESS_SET_CONFIG);
909
910 /* we perform a CYPRESS_GET_CONFIG so that the current settings are
911 * filled into the private structure this should confirm that all is
912 * working if it returns what we just set */
913 cypress_serial_control(tty, port, 0, 0, 0, 0, 0, 0, CYPRESS_GET_CONFIG);
914
915 /* Here we can define custom tty settings for devices; the main tty
916 * termios flag base comes from empeg.c */
917
918 spin_lock_irqsave(&priv->lock, flags);
919 if (priv->chiptype == CT_EARTHMATE && priv->baud_rate == 4800) {
920 dev_dbg(dev, "Using custom termios settings for a baud rate of 4800bps.\n");
921 /* define custom termios settings for NMEA protocol */
922
923 tty->termios.c_iflag /* input modes - */
924 &= ~(IGNBRK /* disable ignore break */
925 | BRKINT /* disable break causes interrupt */
926 | PARMRK /* disable mark parity errors */
927 | ISTRIP /* disable clear high bit of input char */
928 | INLCR /* disable translate NL to CR */
929 | IGNCR /* disable ignore CR */
930 | ICRNL /* disable translate CR to NL */
931 | IXON); /* disable enable XON/XOFF flow control */
932
933 tty->termios.c_oflag /* output modes */
934 &= ~OPOST; /* disable postprocess output char */
935
936 tty->termios.c_lflag /* line discipline modes */
937 &= ~(ECHO /* disable echo input characters */
938 | ECHONL /* disable echo new line */
939 | ICANON /* disable erase, kill, werase, and rprnt
940 special characters */
941 | ISIG /* disable interrupt, quit, and suspend
942 special characters */
943 | IEXTEN); /* disable non-POSIX special characters */
944 } /* CT_CYPHIDCOM: Application should handle this for device */
945
946 linechange = (priv->line_control != oldlines);
947 spin_unlock_irqrestore(&priv->lock, flags);
948
949 /* if necessary, set lines */
950 if (linechange) {
951 priv->cmd_ctrl = 1;
952 cypress_write(tty, port, NULL, 0);
953 }
954} /* cypress_set_termios */
955
956
957/* returns amount of data still left in soft buffer */
958static unsigned int cypress_chars_in_buffer(struct tty_struct *tty)
959{
960 struct usb_serial_port *port = tty->driver_data;
961 struct cypress_private *priv = usb_get_serial_port_data(port);
962 unsigned int chars;
963 unsigned long flags;
964
965 spin_lock_irqsave(&priv->lock, flags);
966 chars = kfifo_len(&priv->write_fifo);
967 spin_unlock_irqrestore(&priv->lock, flags);
968
969 dev_dbg(&port->dev, "%s - returns %u\n", __func__, chars);
970 return chars;
971}
972
973
974static void cypress_throttle(struct tty_struct *tty)
975{
976 struct usb_serial_port *port = tty->driver_data;
977 struct cypress_private *priv = usb_get_serial_port_data(port);
978
979 spin_lock_irq(&priv->lock);
980 priv->rx_flags = THROTTLED;
981 spin_unlock_irq(&priv->lock);
982}
983
984
985static void cypress_unthrottle(struct tty_struct *tty)
986{
987 struct usb_serial_port *port = tty->driver_data;
988 struct cypress_private *priv = usb_get_serial_port_data(port);
989 int actually_throttled, result;
990
991 spin_lock_irq(&priv->lock);
992 actually_throttled = priv->rx_flags & ACTUALLY_THROTTLED;
993 priv->rx_flags = 0;
994 spin_unlock_irq(&priv->lock);
995
996 if (!priv->comm_is_ok)
997 return;
998
999 if (actually_throttled) {
1000 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
1001 if (result) {
1002 dev_err(&port->dev, "%s - failed submitting read urb, "
1003 "error %d\n", __func__, result);
1004 cypress_set_dead(port);
1005 }
1006 }
1007}
1008
1009
1010static void cypress_read_int_callback(struct urb *urb)
1011{
1012 struct usb_serial_port *port = urb->context;
1013 struct cypress_private *priv = usb_get_serial_port_data(port);
1014 struct device *dev = &urb->dev->dev;
1015 struct tty_struct *tty;
1016 unsigned char *data = urb->transfer_buffer;
1017 unsigned long flags;
1018 char tty_flag = TTY_NORMAL;
1019 int bytes = 0;
1020 int result;
1021 int i = 0;
1022 int status = urb->status;
1023
1024 switch (status) {
1025 case 0: /* success */
1026 break;
1027 case -ECONNRESET:
1028 case -ENOENT:
1029 case -ESHUTDOWN:
1030 /* precursor to disconnect so just go away */
1031 return;
1032 case -EPIPE:
1033 /* Can't call usb_clear_halt while in_interrupt */
1034 fallthrough;
1035 default:
1036 /* something ugly is going on... */
1037 dev_err(dev, "%s - unexpected nonzero read status received: %d\n",
1038 __func__, status);
1039 cypress_set_dead(port);
1040 return;
1041 }
1042
1043 spin_lock_irqsave(&priv->lock, flags);
1044 if (priv->rx_flags & THROTTLED) {
1045 dev_dbg(dev, "%s - now throttling\n", __func__);
1046 priv->rx_flags |= ACTUALLY_THROTTLED;
1047 spin_unlock_irqrestore(&priv->lock, flags);
1048 return;
1049 }
1050 spin_unlock_irqrestore(&priv->lock, flags);
1051
1052 tty = tty_port_tty_get(&port->port);
1053 if (!tty) {
1054 dev_dbg(dev, "%s - bad tty pointer - exiting\n", __func__);
1055 return;
1056 }
1057
1058 spin_lock_irqsave(&priv->lock, flags);
1059 result = urb->actual_length;
1060 switch (priv->pkt_fmt) {
1061 default:
1062 case packet_format_1:
1063 /* This is for the CY7C64013... */
1064 priv->current_status = data[0] & 0xF8;
1065 bytes = data[1] + 2;
1066 i = 2;
1067 break;
1068 case packet_format_2:
1069 /* This is for the CY7C63743... */
1070 priv->current_status = data[0] & 0xF8;
1071 bytes = (data[0] & 0x07) + 1;
1072 i = 1;
1073 break;
1074 }
1075 spin_unlock_irqrestore(&priv->lock, flags);
1076 if (result < bytes) {
1077 dev_dbg(dev,
1078 "%s - wrong packet size - received %d bytes but packet said %d bytes\n",
1079 __func__, result, bytes);
1080 goto continue_read;
1081 }
1082
1083 usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
1084
1085 spin_lock_irqsave(&priv->lock, flags);
1086 /* check to see if status has changed */
1087 if (priv->current_status != priv->prev_status) {
1088 u8 delta = priv->current_status ^ priv->prev_status;
1089
1090 if (delta & UART_MSR_MASK) {
1091 if (delta & UART_CTS)
1092 port->icount.cts++;
1093 if (delta & UART_DSR)
1094 port->icount.dsr++;
1095 if (delta & UART_RI)
1096 port->icount.rng++;
1097 if (delta & UART_CD)
1098 port->icount.dcd++;
1099
1100 wake_up_interruptible(&port->port.delta_msr_wait);
1101 }
1102
1103 priv->prev_status = priv->current_status;
1104 }
1105 spin_unlock_irqrestore(&priv->lock, flags);
1106
1107 /* hangup, as defined in acm.c... this might be a bad place for it
1108 * though */
1109 if (tty && !C_CLOCAL(tty) && !(priv->current_status & UART_CD)) {
1110 dev_dbg(dev, "%s - calling hangup\n", __func__);
1111 tty_hangup(tty);
1112 goto continue_read;
1113 }
1114
1115 /* There is one error bit... I'm assuming it is a parity error
1116 * indicator as the generic firmware will set this bit to 1 if a
1117 * parity error occurs.
1118 * I can not find reference to any other error events. */
1119 spin_lock_irqsave(&priv->lock, flags);
1120 if (priv->current_status & CYP_ERROR) {
1121 spin_unlock_irqrestore(&priv->lock, flags);
1122 tty_flag = TTY_PARITY;
1123 dev_dbg(dev, "%s - Parity Error detected\n", __func__);
1124 } else
1125 spin_unlock_irqrestore(&priv->lock, flags);
1126
1127 /* process read if there is data other than line status */
1128 if (bytes > i) {
1129 tty_insert_flip_string_fixed_flag(&port->port, data + i,
1130 tty_flag, bytes - i);
1131 tty_flip_buffer_push(&port->port);
1132 }
1133
1134 spin_lock_irqsave(&priv->lock, flags);
1135 /* control and status byte(s) are also counted */
1136 priv->bytes_in += bytes;
1137 spin_unlock_irqrestore(&priv->lock, flags);
1138
1139continue_read:
1140 tty_kref_put(tty);
1141
1142 /* Continue trying to always read */
1143
1144 if (priv->comm_is_ok) {
1145 usb_fill_int_urb(port->interrupt_in_urb, port->serial->dev,
1146 usb_rcvintpipe(port->serial->dev,
1147 port->interrupt_in_endpointAddress),
1148 port->interrupt_in_urb->transfer_buffer,
1149 port->interrupt_in_urb->transfer_buffer_length,
1150 cypress_read_int_callback, port,
1151 priv->read_urb_interval);
1152 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
1153 if (result && result != -EPERM) {
1154 dev_err(dev, "%s - failed resubmitting read urb, error %d\n",
1155 __func__, result);
1156 cypress_set_dead(port);
1157 }
1158 }
1159} /* cypress_read_int_callback */
1160
1161
1162static void cypress_write_int_callback(struct urb *urb)
1163{
1164 struct usb_serial_port *port = urb->context;
1165 struct cypress_private *priv = usb_get_serial_port_data(port);
1166 struct device *dev = &urb->dev->dev;
1167 int status = urb->status;
1168
1169 switch (status) {
1170 case 0:
1171 /* success */
1172 break;
1173 case -ECONNRESET:
1174 case -ENOENT:
1175 case -ESHUTDOWN:
1176 /* this urb is terminated, clean up */
1177 dev_dbg(dev, "%s - urb shutting down with status: %d\n",
1178 __func__, status);
1179 priv->write_urb_in_use = 0;
1180 return;
1181 case -EPIPE:
1182 /* Cannot call usb_clear_halt while in_interrupt */
1183 fallthrough;
1184 default:
1185 dev_err(dev, "%s - unexpected nonzero write status received: %d\n",
1186 __func__, status);
1187 cypress_set_dead(port);
1188 break;
1189 }
1190 priv->write_urb_in_use = 0;
1191
1192 /* send any buffered data */
1193 cypress_send(port);
1194}
1195
1196module_usb_serial_driver(serial_drivers, id_table_combined);
1197
1198MODULE_AUTHOR(DRIVER_AUTHOR);
1199MODULE_DESCRIPTION(DRIVER_DESC);
1200MODULE_LICENSE("GPL");
1201
1202module_param(stats, bool, S_IRUGO | S_IWUSR);
1203MODULE_PARM_DESC(stats, "Enable statistics or not");
1204module_param(interval, int, S_IRUGO | S_IWUSR);
1205MODULE_PARM_DESC(interval, "Overrides interrupt interval");
1206module_param(unstable_bauds, bool, S_IRUGO | S_IWUSR);
1207MODULE_PARM_DESC(unstable_bauds, "Allow unstable baud rates");