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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 int 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 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 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; /* 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 int 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 return 0;
577}
578
579static int cypress_open(struct tty_struct *tty, struct usb_serial_port *port)
580{
581 struct cypress_private *priv = usb_get_serial_port_data(port);
582 struct usb_serial *serial = port->serial;
583 unsigned long flags;
584 int result = 0;
585
586 if (!priv->comm_is_ok)
587 return -EIO;
588
589 /* clear halts before open */
590 usb_clear_halt(serial->dev, 0x81);
591 usb_clear_halt(serial->dev, 0x02);
592
593 spin_lock_irqsave(&priv->lock, flags);
594 /* reset read/write statistics */
595 priv->bytes_in = 0;
596 priv->bytes_out = 0;
597 priv->cmd_count = 0;
598 priv->rx_flags = 0;
599 spin_unlock_irqrestore(&priv->lock, flags);
600
601 /* Set termios */
602 cypress_send(port);
603
604 if (tty)
605 cypress_set_termios(tty, port, NULL);
606
607 /* setup the port and start reading from the device */
608 usb_fill_int_urb(port->interrupt_in_urb, serial->dev,
609 usb_rcvintpipe(serial->dev, port->interrupt_in_endpointAddress),
610 port->interrupt_in_urb->transfer_buffer,
611 port->interrupt_in_urb->transfer_buffer_length,
612 cypress_read_int_callback, port, priv->read_urb_interval);
613 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
614
615 if (result) {
616 dev_err(&port->dev,
617 "%s - failed submitting read urb, error %d\n",
618 __func__, result);
619 cypress_set_dead(port);
620 }
621
622 return result;
623} /* cypress_open */
624
625static void cypress_dtr_rts(struct usb_serial_port *port, int on)
626{
627 struct cypress_private *priv = usb_get_serial_port_data(port);
628 /* drop dtr and rts */
629 spin_lock_irq(&priv->lock);
630 if (on == 0)
631 priv->line_control = 0;
632 else
633 priv->line_control = CONTROL_DTR | CONTROL_RTS;
634 priv->cmd_ctrl = 1;
635 spin_unlock_irq(&priv->lock);
636 cypress_write(NULL, port, NULL, 0);
637}
638
639static void cypress_close(struct usb_serial_port *port)
640{
641 struct cypress_private *priv = usb_get_serial_port_data(port);
642 unsigned long flags;
643
644 spin_lock_irqsave(&priv->lock, flags);
645 kfifo_reset_out(&priv->write_fifo);
646 spin_unlock_irqrestore(&priv->lock, flags);
647
648 dev_dbg(&port->dev, "%s - stopping urbs\n", __func__);
649 usb_kill_urb(port->interrupt_in_urb);
650 usb_kill_urb(port->interrupt_out_urb);
651
652 if (stats)
653 dev_info(&port->dev, "Statistics: %d Bytes In | %d Bytes Out | %d Commands Issued\n",
654 priv->bytes_in, priv->bytes_out, priv->cmd_count);
655} /* cypress_close */
656
657
658static int cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
659 const unsigned char *buf, int count)
660{
661 struct cypress_private *priv = usb_get_serial_port_data(port);
662
663 dev_dbg(&port->dev, "%s - %d bytes\n", __func__, count);
664
665 /* line control commands, which need to be executed immediately,
666 are not put into the buffer for obvious reasons.
667 */
668 if (priv->cmd_ctrl) {
669 count = 0;
670 goto finish;
671 }
672
673 if (!count)
674 return count;
675
676 count = kfifo_in_locked(&priv->write_fifo, buf, count, &priv->lock);
677
678finish:
679 cypress_send(port);
680
681 return count;
682} /* cypress_write */
683
684
685static void cypress_send(struct usb_serial_port *port)
686{
687 int count = 0, result, offset, actual_size;
688 struct cypress_private *priv = usb_get_serial_port_data(port);
689 struct device *dev = &port->dev;
690 unsigned long flags;
691
692 if (!priv->comm_is_ok)
693 return;
694
695 dev_dbg(dev, "%s - interrupt out size is %d\n", __func__,
696 port->interrupt_out_size);
697
698 spin_lock_irqsave(&priv->lock, flags);
699 if (priv->write_urb_in_use) {
700 dev_dbg(dev, "%s - can't write, urb in use\n", __func__);
701 spin_unlock_irqrestore(&priv->lock, flags);
702 return;
703 }
704 spin_unlock_irqrestore(&priv->lock, flags);
705
706 /* clear buffer */
707 memset(port->interrupt_out_urb->transfer_buffer, 0,
708 port->interrupt_out_size);
709
710 spin_lock_irqsave(&priv->lock, flags);
711 switch (priv->pkt_fmt) {
712 default:
713 case packet_format_1:
714 /* this is for the CY7C64013... */
715 offset = 2;
716 port->interrupt_out_buffer[0] = priv->line_control;
717 break;
718 case packet_format_2:
719 /* this is for the CY7C63743... */
720 offset = 1;
721 port->interrupt_out_buffer[0] = priv->line_control;
722 break;
723 }
724
725 if (priv->line_control & CONTROL_RESET)
726 priv->line_control &= ~CONTROL_RESET;
727
728 if (priv->cmd_ctrl) {
729 priv->cmd_count++;
730 dev_dbg(dev, "%s - line control command being issued\n", __func__);
731 spin_unlock_irqrestore(&priv->lock, flags);
732 goto send;
733 } else
734 spin_unlock_irqrestore(&priv->lock, flags);
735
736 count = kfifo_out_locked(&priv->write_fifo,
737 &port->interrupt_out_buffer[offset],
738 port->interrupt_out_size - offset,
739 &priv->lock);
740 if (count == 0)
741 return;
742
743 switch (priv->pkt_fmt) {
744 default:
745 case packet_format_1:
746 port->interrupt_out_buffer[1] = count;
747 break;
748 case packet_format_2:
749 port->interrupt_out_buffer[0] |= count;
750 }
751
752 dev_dbg(dev, "%s - count is %d\n", __func__, count);
753
754send:
755 spin_lock_irqsave(&priv->lock, flags);
756 priv->write_urb_in_use = 1;
757 spin_unlock_irqrestore(&priv->lock, flags);
758
759 if (priv->cmd_ctrl)
760 actual_size = 1;
761 else
762 actual_size = count +
763 (priv->pkt_fmt == packet_format_1 ? 2 : 1);
764
765 usb_serial_debug_data(dev, __func__, port->interrupt_out_size,
766 port->interrupt_out_urb->transfer_buffer);
767
768 usb_fill_int_urb(port->interrupt_out_urb, port->serial->dev,
769 usb_sndintpipe(port->serial->dev, port->interrupt_out_endpointAddress),
770 port->interrupt_out_buffer, actual_size,
771 cypress_write_int_callback, port, priv->write_urb_interval);
772 result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC);
773 if (result) {
774 dev_err_console(port,
775 "%s - failed submitting write urb, error %d\n",
776 __func__, result);
777 priv->write_urb_in_use = 0;
778 cypress_set_dead(port);
779 }
780
781 spin_lock_irqsave(&priv->lock, flags);
782 if (priv->cmd_ctrl)
783 priv->cmd_ctrl = 0;
784
785 /* do not count the line control and size bytes */
786 priv->bytes_out += count;
787 spin_unlock_irqrestore(&priv->lock, flags);
788
789 usb_serial_port_softint(port);
790} /* cypress_send */
791
792
793/* returns how much space is available in the soft buffer */
794static int cypress_write_room(struct tty_struct *tty)
795{
796 struct usb_serial_port *port = tty->driver_data;
797 struct cypress_private *priv = usb_get_serial_port_data(port);
798 int room = 0;
799 unsigned long flags;
800
801 spin_lock_irqsave(&priv->lock, flags);
802 room = kfifo_avail(&priv->write_fifo);
803 spin_unlock_irqrestore(&priv->lock, flags);
804
805 dev_dbg(&port->dev, "%s - returns %d\n", __func__, room);
806 return room;
807}
808
809
810static int cypress_tiocmget(struct tty_struct *tty)
811{
812 struct usb_serial_port *port = tty->driver_data;
813 struct cypress_private *priv = usb_get_serial_port_data(port);
814 __u8 status, control;
815 unsigned int result = 0;
816 unsigned long flags;
817
818 spin_lock_irqsave(&priv->lock, flags);
819 control = priv->line_control;
820 status = priv->current_status;
821 spin_unlock_irqrestore(&priv->lock, flags);
822
823 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
824 | ((control & CONTROL_RTS) ? TIOCM_RTS : 0)
825 | ((status & UART_CTS) ? TIOCM_CTS : 0)
826 | ((status & UART_DSR) ? TIOCM_DSR : 0)
827 | ((status & UART_RI) ? TIOCM_RI : 0)
828 | ((status & UART_CD) ? TIOCM_CD : 0);
829
830 dev_dbg(&port->dev, "%s - result = %x\n", __func__, result);
831
832 return result;
833}
834
835
836static int cypress_tiocmset(struct tty_struct *tty,
837 unsigned int set, unsigned int clear)
838{
839 struct usb_serial_port *port = tty->driver_data;
840 struct cypress_private *priv = usb_get_serial_port_data(port);
841 unsigned long flags;
842
843 spin_lock_irqsave(&priv->lock, flags);
844 if (set & TIOCM_RTS)
845 priv->line_control |= CONTROL_RTS;
846 if (set & TIOCM_DTR)
847 priv->line_control |= CONTROL_DTR;
848 if (clear & TIOCM_RTS)
849 priv->line_control &= ~CONTROL_RTS;
850 if (clear & TIOCM_DTR)
851 priv->line_control &= ~CONTROL_DTR;
852 priv->cmd_ctrl = 1;
853 spin_unlock_irqrestore(&priv->lock, flags);
854
855 return cypress_write(tty, port, NULL, 0);
856}
857
858static void cypress_earthmate_init_termios(struct tty_struct *tty)
859{
860 tty_encode_baud_rate(tty, 4800, 4800);
861}
862
863static void cypress_set_termios(struct tty_struct *tty,
864 struct usb_serial_port *port, struct ktermios *old_termios)
865{
866 struct cypress_private *priv = usb_get_serial_port_data(port);
867 struct device *dev = &port->dev;
868 int data_bits, stop_bits, parity_type, parity_enable;
869 unsigned int cflag;
870 unsigned long flags;
871 __u8 oldlines;
872 int linechange = 0;
873
874 /* Unsupported features need clearing */
875 tty->termios.c_cflag &= ~(CMSPAR|CRTSCTS);
876
877 cflag = tty->termios.c_cflag;
878
879 /* set number of data bits, parity, stop bits */
880 /* when parity is disabled the parity type bit is ignored */
881
882 /* 1 means 2 stop bits, 0 means 1 stop bit */
883 stop_bits = cflag & CSTOPB ? 1 : 0;
884
885 if (cflag & PARENB) {
886 parity_enable = 1;
887 /* 1 means odd parity, 0 means even parity */
888 parity_type = cflag & PARODD ? 1 : 0;
889 } else
890 parity_enable = parity_type = 0;
891
892 switch (cflag & CSIZE) {
893 case CS5:
894 data_bits = 0;
895 break;
896 case CS6:
897 data_bits = 1;
898 break;
899 case CS7:
900 data_bits = 2;
901 break;
902 case CS8:
903 data_bits = 3;
904 break;
905 default:
906 dev_err(dev, "%s - CSIZE was set, but not CS5-CS8\n", __func__);
907 data_bits = 3;
908 }
909 spin_lock_irqsave(&priv->lock, flags);
910 oldlines = priv->line_control;
911 if ((cflag & CBAUD) == B0) {
912 /* drop dtr and rts */
913 dev_dbg(dev, "%s - dropping the lines, baud rate 0bps\n", __func__);
914 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
915 } else
916 priv->line_control = (CONTROL_DTR | CONTROL_RTS);
917 spin_unlock_irqrestore(&priv->lock, flags);
918
919 dev_dbg(dev, "%s - sending %d stop_bits, %d parity_enable, %d parity_type, %d data_bits (+5)\n",
920 __func__, stop_bits, parity_enable, parity_type, data_bits);
921
922 cypress_serial_control(tty, port, tty_get_baud_rate(tty),
923 data_bits, stop_bits,
924 parity_enable, parity_type,
925 0, CYPRESS_SET_CONFIG);
926
927 /* we perform a CYPRESS_GET_CONFIG so that the current settings are
928 * filled into the private structure this should confirm that all is
929 * working if it returns what we just set */
930 cypress_serial_control(tty, port, 0, 0, 0, 0, 0, 0, CYPRESS_GET_CONFIG);
931
932 /* Here we can define custom tty settings for devices; the main tty
933 * termios flag base comes from empeg.c */
934
935 spin_lock_irqsave(&priv->lock, flags);
936 if (priv->chiptype == CT_EARTHMATE && priv->baud_rate == 4800) {
937 dev_dbg(dev, "Using custom termios settings for a baud rate of 4800bps.\n");
938 /* define custom termios settings for NMEA protocol */
939
940 tty->termios.c_iflag /* input modes - */
941 &= ~(IGNBRK /* disable ignore break */
942 | BRKINT /* disable break causes interrupt */
943 | PARMRK /* disable mark parity errors */
944 | ISTRIP /* disable clear high bit of input char */
945 | INLCR /* disable translate NL to CR */
946 | IGNCR /* disable ignore CR */
947 | ICRNL /* disable translate CR to NL */
948 | IXON); /* disable enable XON/XOFF flow control */
949
950 tty->termios.c_oflag /* output modes */
951 &= ~OPOST; /* disable postprocess output char */
952
953 tty->termios.c_lflag /* line discipline modes */
954 &= ~(ECHO /* disable echo input characters */
955 | ECHONL /* disable echo new line */
956 | ICANON /* disable erase, kill, werase, and rprnt
957 special characters */
958 | ISIG /* disable interrupt, quit, and suspend
959 special characters */
960 | IEXTEN); /* disable non-POSIX special characters */
961 } /* CT_CYPHIDCOM: Application should handle this for device */
962
963 linechange = (priv->line_control != oldlines);
964 spin_unlock_irqrestore(&priv->lock, flags);
965
966 /* if necessary, set lines */
967 if (linechange) {
968 priv->cmd_ctrl = 1;
969 cypress_write(tty, port, NULL, 0);
970 }
971} /* cypress_set_termios */
972
973
974/* returns amount of data still left in soft buffer */
975static int cypress_chars_in_buffer(struct tty_struct *tty)
976{
977 struct usb_serial_port *port = tty->driver_data;
978 struct cypress_private *priv = usb_get_serial_port_data(port);
979 int chars = 0;
980 unsigned long flags;
981
982 spin_lock_irqsave(&priv->lock, flags);
983 chars = kfifo_len(&priv->write_fifo);
984 spin_unlock_irqrestore(&priv->lock, flags);
985
986 dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
987 return chars;
988}
989
990
991static void cypress_throttle(struct tty_struct *tty)
992{
993 struct usb_serial_port *port = tty->driver_data;
994 struct cypress_private *priv = usb_get_serial_port_data(port);
995
996 spin_lock_irq(&priv->lock);
997 priv->rx_flags = THROTTLED;
998 spin_unlock_irq(&priv->lock);
999}
1000
1001
1002static void cypress_unthrottle(struct tty_struct *tty)
1003{
1004 struct usb_serial_port *port = tty->driver_data;
1005 struct cypress_private *priv = usb_get_serial_port_data(port);
1006 int actually_throttled, result;
1007
1008 spin_lock_irq(&priv->lock);
1009 actually_throttled = priv->rx_flags & ACTUALLY_THROTTLED;
1010 priv->rx_flags = 0;
1011 spin_unlock_irq(&priv->lock);
1012
1013 if (!priv->comm_is_ok)
1014 return;
1015
1016 if (actually_throttled) {
1017 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
1018 if (result) {
1019 dev_err(&port->dev, "%s - failed submitting read urb, "
1020 "error %d\n", __func__, result);
1021 cypress_set_dead(port);
1022 }
1023 }
1024}
1025
1026
1027static void cypress_read_int_callback(struct urb *urb)
1028{
1029 struct usb_serial_port *port = urb->context;
1030 struct cypress_private *priv = usb_get_serial_port_data(port);
1031 struct device *dev = &urb->dev->dev;
1032 struct tty_struct *tty;
1033 unsigned char *data = urb->transfer_buffer;
1034 unsigned long flags;
1035 char tty_flag = TTY_NORMAL;
1036 int bytes = 0;
1037 int result;
1038 int i = 0;
1039 int status = urb->status;
1040
1041 switch (status) {
1042 case 0: /* success */
1043 break;
1044 case -ECONNRESET:
1045 case -ENOENT:
1046 case -ESHUTDOWN:
1047 /* precursor to disconnect so just go away */
1048 return;
1049 case -EPIPE:
1050 /* Can't call usb_clear_halt while in_interrupt */
1051 fallthrough;
1052 default:
1053 /* something ugly is going on... */
1054 dev_err(dev, "%s - unexpected nonzero read status received: %d\n",
1055 __func__, status);
1056 cypress_set_dead(port);
1057 return;
1058 }
1059
1060 spin_lock_irqsave(&priv->lock, flags);
1061 if (priv->rx_flags & THROTTLED) {
1062 dev_dbg(dev, "%s - now throttling\n", __func__);
1063 priv->rx_flags |= ACTUALLY_THROTTLED;
1064 spin_unlock_irqrestore(&priv->lock, flags);
1065 return;
1066 }
1067 spin_unlock_irqrestore(&priv->lock, flags);
1068
1069 tty = tty_port_tty_get(&port->port);
1070 if (!tty) {
1071 dev_dbg(dev, "%s - bad tty pointer - exiting\n", __func__);
1072 return;
1073 }
1074
1075 spin_lock_irqsave(&priv->lock, flags);
1076 result = urb->actual_length;
1077 switch (priv->pkt_fmt) {
1078 default:
1079 case packet_format_1:
1080 /* This is for the CY7C64013... */
1081 priv->current_status = data[0] & 0xF8;
1082 bytes = data[1] + 2;
1083 i = 2;
1084 break;
1085 case packet_format_2:
1086 /* This is for the CY7C63743... */
1087 priv->current_status = data[0] & 0xF8;
1088 bytes = (data[0] & 0x07) + 1;
1089 i = 1;
1090 break;
1091 }
1092 spin_unlock_irqrestore(&priv->lock, flags);
1093 if (result < bytes) {
1094 dev_dbg(dev,
1095 "%s - wrong packet size - received %d bytes but packet said %d bytes\n",
1096 __func__, result, bytes);
1097 goto continue_read;
1098 }
1099
1100 usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
1101
1102 spin_lock_irqsave(&priv->lock, flags);
1103 /* check to see if status has changed */
1104 if (priv->current_status != priv->prev_status) {
1105 u8 delta = priv->current_status ^ priv->prev_status;
1106
1107 if (delta & UART_MSR_MASK) {
1108 if (delta & UART_CTS)
1109 port->icount.cts++;
1110 if (delta & UART_DSR)
1111 port->icount.dsr++;
1112 if (delta & UART_RI)
1113 port->icount.rng++;
1114 if (delta & UART_CD)
1115 port->icount.dcd++;
1116
1117 wake_up_interruptible(&port->port.delta_msr_wait);
1118 }
1119
1120 priv->prev_status = priv->current_status;
1121 }
1122 spin_unlock_irqrestore(&priv->lock, flags);
1123
1124 /* hangup, as defined in acm.c... this might be a bad place for it
1125 * though */
1126 if (tty && !C_CLOCAL(tty) && !(priv->current_status & UART_CD)) {
1127 dev_dbg(dev, "%s - calling hangup\n", __func__);
1128 tty_hangup(tty);
1129 goto continue_read;
1130 }
1131
1132 /* There is one error bit... I'm assuming it is a parity error
1133 * indicator as the generic firmware will set this bit to 1 if a
1134 * parity error occurs.
1135 * I can not find reference to any other error events. */
1136 spin_lock_irqsave(&priv->lock, flags);
1137 if (priv->current_status & CYP_ERROR) {
1138 spin_unlock_irqrestore(&priv->lock, flags);
1139 tty_flag = TTY_PARITY;
1140 dev_dbg(dev, "%s - Parity Error detected\n", __func__);
1141 } else
1142 spin_unlock_irqrestore(&priv->lock, flags);
1143
1144 /* process read if there is data other than line status */
1145 if (bytes > i) {
1146 tty_insert_flip_string_fixed_flag(&port->port, data + i,
1147 tty_flag, bytes - i);
1148 tty_flip_buffer_push(&port->port);
1149 }
1150
1151 spin_lock_irqsave(&priv->lock, flags);
1152 /* control and status byte(s) are also counted */
1153 priv->bytes_in += bytes;
1154 spin_unlock_irqrestore(&priv->lock, flags);
1155
1156continue_read:
1157 tty_kref_put(tty);
1158
1159 /* Continue trying to always read */
1160
1161 if (priv->comm_is_ok) {
1162 usb_fill_int_urb(port->interrupt_in_urb, port->serial->dev,
1163 usb_rcvintpipe(port->serial->dev,
1164 port->interrupt_in_endpointAddress),
1165 port->interrupt_in_urb->transfer_buffer,
1166 port->interrupt_in_urb->transfer_buffer_length,
1167 cypress_read_int_callback, port,
1168 priv->read_urb_interval);
1169 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
1170 if (result && result != -EPERM) {
1171 dev_err(dev, "%s - failed resubmitting read urb, error %d\n",
1172 __func__, result);
1173 cypress_set_dead(port);
1174 }
1175 }
1176} /* cypress_read_int_callback */
1177
1178
1179static void cypress_write_int_callback(struct urb *urb)
1180{
1181 struct usb_serial_port *port = urb->context;
1182 struct cypress_private *priv = usb_get_serial_port_data(port);
1183 struct device *dev = &urb->dev->dev;
1184 int status = urb->status;
1185
1186 switch (status) {
1187 case 0:
1188 /* success */
1189 break;
1190 case -ECONNRESET:
1191 case -ENOENT:
1192 case -ESHUTDOWN:
1193 /* this urb is terminated, clean up */
1194 dev_dbg(dev, "%s - urb shutting down with status: %d\n",
1195 __func__, status);
1196 priv->write_urb_in_use = 0;
1197 return;
1198 case -EPIPE:
1199 /* Cannot call usb_clear_halt while in_interrupt */
1200 fallthrough;
1201 default:
1202 dev_err(dev, "%s - unexpected nonzero write status received: %d\n",
1203 __func__, status);
1204 cypress_set_dead(port);
1205 break;
1206 }
1207 priv->write_urb_in_use = 0;
1208
1209 /* send any buffered data */
1210 cypress_send(port);
1211}
1212
1213module_usb_serial_driver(serial_drivers, id_table_combined);
1214
1215MODULE_AUTHOR(DRIVER_AUTHOR);
1216MODULE_DESCRIPTION(DRIVER_DESC);
1217MODULE_LICENSE("GPL");
1218
1219module_param(stats, bool, S_IRUGO | S_IWUSR);
1220MODULE_PARM_DESC(stats, "Enable statistics or not");
1221module_param(interval, int, S_IRUGO | S_IWUSR);
1222MODULE_PARM_DESC(interval, "Overrides interrupt interval");
1223module_param(unstable_bauds, bool, S_IRUGO | S_IWUSR);
1224MODULE_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 <linux/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,
129 const struct ktermios *old_termios);
130static int cypress_tiocmget(struct tty_struct *tty);
131static int cypress_tiocmset(struct tty_struct *tty,
132 unsigned int set, unsigned int clear);
133static unsigned int cypress_chars_in_buffer(struct tty_struct *tty);
134static void cypress_throttle(struct tty_struct *tty);
135static void cypress_unthrottle(struct tty_struct *tty);
136static void cypress_set_dead(struct usb_serial_port *port);
137static void cypress_read_int_callback(struct urb *urb);
138static void cypress_write_int_callback(struct urb *urb);
139
140static struct usb_serial_driver cypress_earthmate_device = {
141 .driver = {
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 .name = "cyphidcom",
169 },
170 .description = "HID->COM RS232 Adapter",
171 .id_table = id_table_cyphidcomrs232,
172 .num_ports = 1,
173 .port_probe = cypress_hidcom_port_probe,
174 .port_remove = cypress_port_remove,
175 .open = cypress_open,
176 .close = cypress_close,
177 .dtr_rts = cypress_dtr_rts,
178 .write = cypress_write,
179 .write_room = cypress_write_room,
180 .set_termios = cypress_set_termios,
181 .tiocmget = cypress_tiocmget,
182 .tiocmset = cypress_tiocmset,
183 .tiocmiwait = usb_serial_generic_tiocmiwait,
184 .chars_in_buffer = cypress_chars_in_buffer,
185 .throttle = cypress_throttle,
186 .unthrottle = cypress_unthrottle,
187 .read_int_callback = cypress_read_int_callback,
188 .write_int_callback = cypress_write_int_callback,
189};
190
191static struct usb_serial_driver cypress_ca42v2_device = {
192 .driver = {
193 .name = "nokiaca42v2",
194 },
195 .description = "Nokia CA-42 V2 Adapter",
196 .id_table = id_table_nokiaca42v2,
197 .num_ports = 1,
198 .port_probe = cypress_ca42v2_port_probe,
199 .port_remove = cypress_port_remove,
200 .open = cypress_open,
201 .close = cypress_close,
202 .dtr_rts = cypress_dtr_rts,
203 .write = cypress_write,
204 .write_room = cypress_write_room,
205 .set_termios = cypress_set_termios,
206 .tiocmget = cypress_tiocmget,
207 .tiocmset = cypress_tiocmset,
208 .tiocmiwait = usb_serial_generic_tiocmiwait,
209 .chars_in_buffer = cypress_chars_in_buffer,
210 .throttle = cypress_throttle,
211 .unthrottle = cypress_unthrottle,
212 .read_int_callback = cypress_read_int_callback,
213 .write_int_callback = cypress_write_int_callback,
214};
215
216static struct usb_serial_driver * const serial_drivers[] = {
217 &cypress_earthmate_device, &cypress_hidcom_device,
218 &cypress_ca42v2_device, NULL
219};
220
221/*****************************************************************************
222 * Cypress serial helper functions
223 *****************************************************************************/
224
225/* FRWD Dongle hidcom needs to skip reset and speed checks */
226static inline bool is_frwd(struct usb_device *dev)
227{
228 return ((le16_to_cpu(dev->descriptor.idVendor) == VENDOR_ID_FRWD) &&
229 (le16_to_cpu(dev->descriptor.idProduct) == PRODUCT_ID_CYPHIDCOM_FRWD));
230}
231
232static int analyze_baud_rate(struct usb_serial_port *port, speed_t new_rate)
233{
234 struct cypress_private *priv;
235 priv = usb_get_serial_port_data(port);
236
237 if (unstable_bauds)
238 return new_rate;
239
240 /* FRWD Dongle uses 115200 bps */
241 if (is_frwd(port->serial->dev))
242 return new_rate;
243
244 /*
245 * The general purpose firmware for the Cypress M8 allows for
246 * a maximum speed of 57600bps (I have no idea whether DeLorme
247 * chose to use the general purpose firmware or not), if you
248 * need to modify this speed setting for your own project
249 * please add your own chiptype and modify the code likewise.
250 * The Cypress HID->COM device will work successfully up to
251 * 115200bps (but the actual throughput is around 3kBps).
252 */
253 if (port->serial->dev->speed == USB_SPEED_LOW) {
254 /*
255 * Mike Isely <isely@pobox.com> 2-Feb-2008: The
256 * Cypress app note that describes this mechanism
257 * states that the low-speed part can't handle more
258 * than 800 bytes/sec, in which case 4800 baud is the
259 * safest speed for a part like that.
260 */
261 if (new_rate > 4800) {
262 dev_dbg(&port->dev,
263 "%s - failed setting baud rate, device incapable speed %d\n",
264 __func__, new_rate);
265 return -1;
266 }
267 }
268 switch (priv->chiptype) {
269 case CT_EARTHMATE:
270 if (new_rate <= 600) {
271 /* 300 and 600 baud rates are supported under
272 * the generic firmware, but are not used with
273 * NMEA and SiRF protocols */
274 dev_dbg(&port->dev,
275 "%s - failed setting baud rate, unsupported speed of %d on Earthmate GPS\n",
276 __func__, new_rate);
277 return -1;
278 }
279 break;
280 default:
281 break;
282 }
283 return new_rate;
284}
285
286
287/* This function can either set or retrieve the current serial line settings */
288static int cypress_serial_control(struct tty_struct *tty,
289 struct usb_serial_port *port, speed_t baud_rate, int data_bits,
290 int stop_bits, int parity_enable, int parity_type, int reset,
291 int cypress_request_type)
292{
293 int new_baudrate = 0, retval = 0, tries = 0;
294 struct cypress_private *priv;
295 struct device *dev = &port->dev;
296 u8 *feature_buffer;
297 const unsigned int feature_len = 5;
298 unsigned long flags;
299
300 priv = usb_get_serial_port_data(port);
301
302 if (!priv->comm_is_ok)
303 return -ENODEV;
304
305 feature_buffer = kcalloc(feature_len, sizeof(u8), GFP_KERNEL);
306 if (!feature_buffer)
307 return -ENOMEM;
308
309 switch (cypress_request_type) {
310 case CYPRESS_SET_CONFIG:
311 /* 0 means 'Hang up' so doesn't change the true bit rate */
312 new_baudrate = priv->baud_rate;
313 if (baud_rate && baud_rate != priv->baud_rate) {
314 dev_dbg(dev, "%s - baud rate is changing\n", __func__);
315 retval = analyze_baud_rate(port, baud_rate);
316 if (retval >= 0) {
317 new_baudrate = retval;
318 dev_dbg(dev, "%s - New baud rate set to %d\n",
319 __func__, new_baudrate);
320 }
321 }
322 dev_dbg(dev, "%s - baud rate is being sent as %d\n", __func__,
323 new_baudrate);
324
325 /* fill the feature_buffer with new configuration */
326 put_unaligned_le32(new_baudrate, feature_buffer);
327 feature_buffer[4] |= data_bits - 5; /* assign data bits in 2 bit space ( max 3 ) */
328 /* 1 bit gap */
329 feature_buffer[4] |= (stop_bits << 3); /* assign stop bits in 1 bit space */
330 feature_buffer[4] |= (parity_enable << 4); /* assign parity flag in 1 bit space */
331 feature_buffer[4] |= (parity_type << 5); /* assign parity type in 1 bit space */
332 /* 1 bit gap */
333 feature_buffer[4] |= (reset << 7); /* assign reset at end of byte, 1 bit space */
334
335 dev_dbg(dev, "%s - device is being sent this feature report:\n", __func__);
336 dev_dbg(dev, "%s - %02X - %02X - %02X - %02X - %02X\n", __func__,
337 feature_buffer[0], feature_buffer[1],
338 feature_buffer[2], feature_buffer[3],
339 feature_buffer[4]);
340
341 do {
342 retval = usb_control_msg(port->serial->dev,
343 usb_sndctrlpipe(port->serial->dev, 0),
344 HID_REQ_SET_REPORT,
345 USB_DIR_OUT | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
346 0x0300, 0, feature_buffer,
347 feature_len, 500);
348
349 if (tries++ >= 3)
350 break;
351
352 } while (retval != feature_len &&
353 retval != -ENODEV);
354
355 if (retval != feature_len) {
356 dev_err(dev, "%s - failed sending serial line settings - %d\n",
357 __func__, retval);
358 cypress_set_dead(port);
359 } else {
360 spin_lock_irqsave(&priv->lock, flags);
361 priv->baud_rate = new_baudrate;
362 priv->current_config = feature_buffer[4];
363 spin_unlock_irqrestore(&priv->lock, flags);
364 /* If we asked for a speed change encode it */
365 if (baud_rate)
366 tty_encode_baud_rate(tty,
367 new_baudrate, new_baudrate);
368 }
369 break;
370 case CYPRESS_GET_CONFIG:
371 if (priv->get_cfg_unsafe) {
372 /* Not implemented for this device,
373 and if we try to do it we're likely
374 to crash the hardware. */
375 retval = -ENOTTY;
376 goto out;
377 }
378 dev_dbg(dev, "%s - retrieving serial line settings\n", __func__);
379 do {
380 retval = usb_control_msg(port->serial->dev,
381 usb_rcvctrlpipe(port->serial->dev, 0),
382 HID_REQ_GET_REPORT,
383 USB_DIR_IN | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
384 0x0300, 0, feature_buffer,
385 feature_len, 500);
386
387 if (tries++ >= 3)
388 break;
389 } while (retval != feature_len
390 && retval != -ENODEV);
391
392 if (retval != feature_len) {
393 dev_err(dev, "%s - failed to retrieve serial line settings - %d\n",
394 __func__, retval);
395 cypress_set_dead(port);
396 goto out;
397 } else {
398 spin_lock_irqsave(&priv->lock, flags);
399 /* store the config in one byte, and later
400 use bit masks to check values */
401 priv->current_config = feature_buffer[4];
402 priv->baud_rate = get_unaligned_le32(feature_buffer);
403 spin_unlock_irqrestore(&priv->lock, flags);
404 }
405 }
406 spin_lock_irqsave(&priv->lock, flags);
407 ++priv->cmd_count;
408 spin_unlock_irqrestore(&priv->lock, flags);
409out:
410 kfree(feature_buffer);
411 return retval;
412} /* cypress_serial_control */
413
414
415static void cypress_set_dead(struct usb_serial_port *port)
416{
417 struct cypress_private *priv = usb_get_serial_port_data(port);
418 unsigned long flags;
419
420 spin_lock_irqsave(&priv->lock, flags);
421 if (!priv->comm_is_ok) {
422 spin_unlock_irqrestore(&priv->lock, flags);
423 return;
424 }
425 priv->comm_is_ok = 0;
426 spin_unlock_irqrestore(&priv->lock, flags);
427
428 dev_err(&port->dev, "cypress_m8 suspending failing port %d - "
429 "interval might be too short\n", port->port_number);
430}
431
432
433/*****************************************************************************
434 * Cypress serial driver functions
435 *****************************************************************************/
436
437
438static int cypress_generic_port_probe(struct usb_serial_port *port)
439{
440 struct usb_serial *serial = port->serial;
441 struct cypress_private *priv;
442
443 if (!port->interrupt_out_urb || !port->interrupt_in_urb) {
444 dev_err(&port->dev, "required endpoint is missing\n");
445 return -ENODEV;
446 }
447
448 priv = kzalloc(sizeof(struct cypress_private), GFP_KERNEL);
449 if (!priv)
450 return -ENOMEM;
451
452 priv->comm_is_ok = !0;
453 spin_lock_init(&priv->lock);
454 if (kfifo_alloc(&priv->write_fifo, CYPRESS_BUF_SIZE, GFP_KERNEL)) {
455 kfree(priv);
456 return -ENOMEM;
457 }
458
459 /* Skip reset for FRWD device. It is a workaound:
460 device hangs if it receives SET_CONFIGURE in Configured
461 state. */
462 if (!is_frwd(serial->dev))
463 usb_reset_configuration(serial->dev);
464
465 priv->cmd_ctrl = 0;
466 priv->line_control = 0;
467 priv->rx_flags = 0;
468 /* Default packet format setting is determined by packet size.
469 Anything with a size larger then 9 must have a separate
470 count field since the 3 bit count field is otherwise too
471 small. Otherwise we can use the slightly more compact
472 format. This is in accordance with the cypress_m8 serial
473 converter app note. */
474 if (port->interrupt_out_size > 9)
475 priv->pkt_fmt = packet_format_1;
476 else
477 priv->pkt_fmt = packet_format_2;
478
479 if (interval > 0) {
480 priv->write_urb_interval = interval;
481 priv->read_urb_interval = interval;
482 dev_dbg(&port->dev, "%s - read & write intervals forced to %d\n",
483 __func__, interval);
484 } else {
485 priv->write_urb_interval = port->interrupt_out_urb->interval;
486 priv->read_urb_interval = port->interrupt_in_urb->interval;
487 dev_dbg(&port->dev, "%s - intervals: read=%d write=%d\n",
488 __func__, priv->read_urb_interval,
489 priv->write_urb_interval);
490 }
491 usb_set_serial_port_data(port, priv);
492
493 port->port.drain_delay = 256;
494
495 return 0;
496}
497
498
499static int cypress_earthmate_port_probe(struct usb_serial_port *port)
500{
501 struct usb_serial *serial = port->serial;
502 struct cypress_private *priv;
503 int ret;
504
505 ret = cypress_generic_port_probe(port);
506 if (ret) {
507 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
508 return ret;
509 }
510
511 priv = usb_get_serial_port_data(port);
512 priv->chiptype = CT_EARTHMATE;
513 /* All Earthmate devices use the separated-count packet
514 format! Idiotic. */
515 priv->pkt_fmt = packet_format_1;
516 if (serial->dev->descriptor.idProduct !=
517 cpu_to_le16(PRODUCT_ID_EARTHMATEUSB)) {
518 /* The old original USB Earthmate seemed able to
519 handle GET_CONFIG requests; everything they've
520 produced since that time crashes if this command is
521 attempted :-( */
522 dev_dbg(&port->dev,
523 "%s - Marking this device as unsafe for GET_CONFIG commands\n",
524 __func__);
525 priv->get_cfg_unsafe = !0;
526 }
527
528 return 0;
529}
530
531static int cypress_hidcom_port_probe(struct usb_serial_port *port)
532{
533 struct cypress_private *priv;
534 int ret;
535
536 ret = cypress_generic_port_probe(port);
537 if (ret) {
538 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
539 return ret;
540 }
541
542 priv = usb_get_serial_port_data(port);
543 priv->chiptype = CT_CYPHIDCOM;
544
545 return 0;
546}
547
548static int cypress_ca42v2_port_probe(struct usb_serial_port *port)
549{
550 struct cypress_private *priv;
551 int ret;
552
553 ret = cypress_generic_port_probe(port);
554 if (ret) {
555 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
556 return ret;
557 }
558
559 priv = usb_get_serial_port_data(port);
560 priv->chiptype = CT_CA42V2;
561
562 return 0;
563}
564
565static void cypress_port_remove(struct usb_serial_port *port)
566{
567 struct cypress_private *priv;
568
569 priv = usb_get_serial_port_data(port);
570
571 kfifo_free(&priv->write_fifo);
572 kfree(priv);
573}
574
575static int cypress_open(struct tty_struct *tty, struct usb_serial_port *port)
576{
577 struct cypress_private *priv = usb_get_serial_port_data(port);
578 struct usb_serial *serial = port->serial;
579 unsigned long flags;
580 int result = 0;
581
582 if (!priv->comm_is_ok)
583 return -EIO;
584
585 /* clear halts before open */
586 usb_clear_halt(serial->dev, 0x81);
587 usb_clear_halt(serial->dev, 0x02);
588
589 spin_lock_irqsave(&priv->lock, flags);
590 /* reset read/write statistics */
591 priv->bytes_in = 0;
592 priv->bytes_out = 0;
593 priv->cmd_count = 0;
594 priv->rx_flags = 0;
595 spin_unlock_irqrestore(&priv->lock, flags);
596
597 /* Set termios */
598 cypress_send(port);
599
600 if (tty)
601 cypress_set_termios(tty, port, NULL);
602
603 /* setup the port and start reading from the device */
604 usb_fill_int_urb(port->interrupt_in_urb, serial->dev,
605 usb_rcvintpipe(serial->dev, port->interrupt_in_endpointAddress),
606 port->interrupt_in_urb->transfer_buffer,
607 port->interrupt_in_urb->transfer_buffer_length,
608 cypress_read_int_callback, port, priv->read_urb_interval);
609 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
610
611 if (result) {
612 dev_err(&port->dev,
613 "%s - failed submitting read urb, error %d\n",
614 __func__, result);
615 cypress_set_dead(port);
616 }
617
618 return result;
619} /* cypress_open */
620
621static void cypress_dtr_rts(struct usb_serial_port *port, int on)
622{
623 struct cypress_private *priv = usb_get_serial_port_data(port);
624 /* drop dtr and rts */
625 spin_lock_irq(&priv->lock);
626 if (on == 0)
627 priv->line_control = 0;
628 else
629 priv->line_control = CONTROL_DTR | CONTROL_RTS;
630 priv->cmd_ctrl = 1;
631 spin_unlock_irq(&priv->lock);
632 cypress_write(NULL, port, NULL, 0);
633}
634
635static void cypress_close(struct usb_serial_port *port)
636{
637 struct cypress_private *priv = usb_get_serial_port_data(port);
638 unsigned long flags;
639
640 spin_lock_irqsave(&priv->lock, flags);
641 kfifo_reset_out(&priv->write_fifo);
642 spin_unlock_irqrestore(&priv->lock, flags);
643
644 dev_dbg(&port->dev, "%s - stopping urbs\n", __func__);
645 usb_kill_urb(port->interrupt_in_urb);
646 usb_kill_urb(port->interrupt_out_urb);
647
648 if (stats)
649 dev_info(&port->dev, "Statistics: %d Bytes In | %d Bytes Out | %d Commands Issued\n",
650 priv->bytes_in, priv->bytes_out, priv->cmd_count);
651} /* cypress_close */
652
653
654static int cypress_write(struct tty_struct *tty, struct usb_serial_port *port,
655 const unsigned char *buf, int count)
656{
657 struct cypress_private *priv = usb_get_serial_port_data(port);
658
659 dev_dbg(&port->dev, "%s - %d bytes\n", __func__, count);
660
661 /* line control commands, which need to be executed immediately,
662 are not put into the buffer for obvious reasons.
663 */
664 if (priv->cmd_ctrl) {
665 count = 0;
666 goto finish;
667 }
668
669 if (!count)
670 return count;
671
672 count = kfifo_in_locked(&priv->write_fifo, buf, count, &priv->lock);
673
674finish:
675 cypress_send(port);
676
677 return count;
678} /* cypress_write */
679
680
681static void cypress_send(struct usb_serial_port *port)
682{
683 int count = 0, result, offset, actual_size;
684 struct cypress_private *priv = usb_get_serial_port_data(port);
685 struct device *dev = &port->dev;
686 unsigned long flags;
687
688 if (!priv->comm_is_ok)
689 return;
690
691 dev_dbg(dev, "%s - interrupt out size is %d\n", __func__,
692 port->interrupt_out_size);
693
694 spin_lock_irqsave(&priv->lock, flags);
695 if (priv->write_urb_in_use) {
696 dev_dbg(dev, "%s - can't write, urb in use\n", __func__);
697 spin_unlock_irqrestore(&priv->lock, flags);
698 return;
699 }
700 spin_unlock_irqrestore(&priv->lock, flags);
701
702 /* clear buffer */
703 memset(port->interrupt_out_urb->transfer_buffer, 0,
704 port->interrupt_out_size);
705
706 spin_lock_irqsave(&priv->lock, flags);
707 switch (priv->pkt_fmt) {
708 default:
709 case packet_format_1:
710 /* this is for the CY7C64013... */
711 offset = 2;
712 port->interrupt_out_buffer[0] = priv->line_control;
713 break;
714 case packet_format_2:
715 /* this is for the CY7C63743... */
716 offset = 1;
717 port->interrupt_out_buffer[0] = priv->line_control;
718 break;
719 }
720
721 if (priv->line_control & CONTROL_RESET)
722 priv->line_control &= ~CONTROL_RESET;
723
724 if (priv->cmd_ctrl) {
725 priv->cmd_count++;
726 dev_dbg(dev, "%s - line control command being issued\n", __func__);
727 spin_unlock_irqrestore(&priv->lock, flags);
728 goto send;
729 } else
730 spin_unlock_irqrestore(&priv->lock, flags);
731
732 count = kfifo_out_locked(&priv->write_fifo,
733 &port->interrupt_out_buffer[offset],
734 port->interrupt_out_size - offset,
735 &priv->lock);
736 if (count == 0)
737 return;
738
739 switch (priv->pkt_fmt) {
740 default:
741 case packet_format_1:
742 port->interrupt_out_buffer[1] = count;
743 break;
744 case packet_format_2:
745 port->interrupt_out_buffer[0] |= count;
746 }
747
748 dev_dbg(dev, "%s - count is %d\n", __func__, count);
749
750send:
751 spin_lock_irqsave(&priv->lock, flags);
752 priv->write_urb_in_use = 1;
753 spin_unlock_irqrestore(&priv->lock, flags);
754
755 if (priv->cmd_ctrl)
756 actual_size = 1;
757 else
758 actual_size = count +
759 (priv->pkt_fmt == packet_format_1 ? 2 : 1);
760
761 usb_serial_debug_data(dev, __func__, port->interrupt_out_size,
762 port->interrupt_out_urb->transfer_buffer);
763
764 usb_fill_int_urb(port->interrupt_out_urb, port->serial->dev,
765 usb_sndintpipe(port->serial->dev, port->interrupt_out_endpointAddress),
766 port->interrupt_out_buffer, actual_size,
767 cypress_write_int_callback, port, priv->write_urb_interval);
768 result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC);
769 if (result) {
770 dev_err_console(port,
771 "%s - failed submitting write urb, error %d\n",
772 __func__, result);
773 priv->write_urb_in_use = 0;
774 cypress_set_dead(port);
775 }
776
777 spin_lock_irqsave(&priv->lock, flags);
778 if (priv->cmd_ctrl)
779 priv->cmd_ctrl = 0;
780
781 /* do not count the line control and size bytes */
782 priv->bytes_out += count;
783 spin_unlock_irqrestore(&priv->lock, flags);
784
785 usb_serial_port_softint(port);
786} /* cypress_send */
787
788
789/* returns how much space is available in the soft buffer */
790static unsigned int cypress_write_room(struct tty_struct *tty)
791{
792 struct usb_serial_port *port = tty->driver_data;
793 struct cypress_private *priv = usb_get_serial_port_data(port);
794 unsigned int room;
795 unsigned long flags;
796
797 spin_lock_irqsave(&priv->lock, flags);
798 room = kfifo_avail(&priv->write_fifo);
799 spin_unlock_irqrestore(&priv->lock, flags);
800
801 dev_dbg(&port->dev, "%s - returns %u\n", __func__, room);
802 return room;
803}
804
805
806static int cypress_tiocmget(struct tty_struct *tty)
807{
808 struct usb_serial_port *port = tty->driver_data;
809 struct cypress_private *priv = usb_get_serial_port_data(port);
810 __u8 status, control;
811 unsigned int result = 0;
812 unsigned long flags;
813
814 spin_lock_irqsave(&priv->lock, flags);
815 control = priv->line_control;
816 status = priv->current_status;
817 spin_unlock_irqrestore(&priv->lock, flags);
818
819 result = ((control & CONTROL_DTR) ? TIOCM_DTR : 0)
820 | ((control & CONTROL_RTS) ? TIOCM_RTS : 0)
821 | ((status & UART_CTS) ? TIOCM_CTS : 0)
822 | ((status & UART_DSR) ? TIOCM_DSR : 0)
823 | ((status & UART_RI) ? TIOCM_RI : 0)
824 | ((status & UART_CD) ? TIOCM_CD : 0);
825
826 dev_dbg(&port->dev, "%s - result = %x\n", __func__, result);
827
828 return result;
829}
830
831
832static int cypress_tiocmset(struct tty_struct *tty,
833 unsigned int set, unsigned int clear)
834{
835 struct usb_serial_port *port = tty->driver_data;
836 struct cypress_private *priv = usb_get_serial_port_data(port);
837 unsigned long flags;
838
839 spin_lock_irqsave(&priv->lock, flags);
840 if (set & TIOCM_RTS)
841 priv->line_control |= CONTROL_RTS;
842 if (set & TIOCM_DTR)
843 priv->line_control |= CONTROL_DTR;
844 if (clear & TIOCM_RTS)
845 priv->line_control &= ~CONTROL_RTS;
846 if (clear & TIOCM_DTR)
847 priv->line_control &= ~CONTROL_DTR;
848 priv->cmd_ctrl = 1;
849 spin_unlock_irqrestore(&priv->lock, flags);
850
851 return cypress_write(tty, port, NULL, 0);
852}
853
854static void cypress_earthmate_init_termios(struct tty_struct *tty)
855{
856 tty_encode_baud_rate(tty, 4800, 4800);
857}
858
859static void cypress_set_termios(struct tty_struct *tty,
860 struct usb_serial_port *port,
861 const struct ktermios *old_termios)
862{
863 struct cypress_private *priv = usb_get_serial_port_data(port);
864 struct device *dev = &port->dev;
865 int data_bits, stop_bits, parity_type, parity_enable;
866 unsigned int cflag;
867 unsigned long flags;
868 __u8 oldlines;
869 int linechange = 0;
870
871 /* Unsupported features need clearing */
872 tty->termios.c_cflag &= ~(CMSPAR|CRTSCTS);
873
874 cflag = tty->termios.c_cflag;
875
876 /* set number of data bits, parity, stop bits */
877 /* when parity is disabled the parity type bit is ignored */
878
879 /* 1 means 2 stop bits, 0 means 1 stop bit */
880 stop_bits = cflag & CSTOPB ? 1 : 0;
881
882 if (cflag & PARENB) {
883 parity_enable = 1;
884 /* 1 means odd parity, 0 means even parity */
885 parity_type = cflag & PARODD ? 1 : 0;
886 } else
887 parity_enable = parity_type = 0;
888
889 data_bits = tty_get_char_size(cflag);
890
891 spin_lock_irqsave(&priv->lock, flags);
892 oldlines = priv->line_control;
893 if ((cflag & CBAUD) == B0) {
894 /* drop dtr and rts */
895 dev_dbg(dev, "%s - dropping the lines, baud rate 0bps\n", __func__);
896 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
897 } else
898 priv->line_control = (CONTROL_DTR | CONTROL_RTS);
899 spin_unlock_irqrestore(&priv->lock, flags);
900
901 dev_dbg(dev, "%s - sending %d stop_bits, %d parity_enable, %d parity_type, %d data_bits (+5)\n",
902 __func__, stop_bits, parity_enable, parity_type, data_bits);
903
904 cypress_serial_control(tty, port, tty_get_baud_rate(tty),
905 data_bits, stop_bits,
906 parity_enable, parity_type,
907 0, CYPRESS_SET_CONFIG);
908
909 /* we perform a CYPRESS_GET_CONFIG so that the current settings are
910 * filled into the private structure this should confirm that all is
911 * working if it returns what we just set */
912 cypress_serial_control(tty, port, 0, 0, 0, 0, 0, 0, CYPRESS_GET_CONFIG);
913
914 /* Here we can define custom tty settings for devices; the main tty
915 * termios flag base comes from empeg.c */
916
917 spin_lock_irqsave(&priv->lock, flags);
918 if (priv->chiptype == CT_EARTHMATE && priv->baud_rate == 4800) {
919 dev_dbg(dev, "Using custom termios settings for a baud rate of 4800bps.\n");
920 /* define custom termios settings for NMEA protocol */
921
922 tty->termios.c_iflag /* input modes - */
923 &= ~(IGNBRK /* disable ignore break */
924 | BRKINT /* disable break causes interrupt */
925 | PARMRK /* disable mark parity errors */
926 | ISTRIP /* disable clear high bit of input char */
927 | INLCR /* disable translate NL to CR */
928 | IGNCR /* disable ignore CR */
929 | ICRNL /* disable translate CR to NL */
930 | IXON); /* disable enable XON/XOFF flow control */
931
932 tty->termios.c_oflag /* output modes */
933 &= ~OPOST; /* disable postprocess output char */
934
935 tty->termios.c_lflag /* line discipline modes */
936 &= ~(ECHO /* disable echo input characters */
937 | ECHONL /* disable echo new line */
938 | ICANON /* disable erase, kill, werase, and rprnt
939 special characters */
940 | ISIG /* disable interrupt, quit, and suspend
941 special characters */
942 | IEXTEN); /* disable non-POSIX special characters */
943 } /* CT_CYPHIDCOM: Application should handle this for device */
944
945 linechange = (priv->line_control != oldlines);
946 spin_unlock_irqrestore(&priv->lock, flags);
947
948 /* if necessary, set lines */
949 if (linechange) {
950 priv->cmd_ctrl = 1;
951 cypress_write(tty, port, NULL, 0);
952 }
953} /* cypress_set_termios */
954
955
956/* returns amount of data still left in soft buffer */
957static unsigned int cypress_chars_in_buffer(struct tty_struct *tty)
958{
959 struct usb_serial_port *port = tty->driver_data;
960 struct cypress_private *priv = usb_get_serial_port_data(port);
961 unsigned int chars;
962 unsigned long flags;
963
964 spin_lock_irqsave(&priv->lock, flags);
965 chars = kfifo_len(&priv->write_fifo);
966 spin_unlock_irqrestore(&priv->lock, flags);
967
968 dev_dbg(&port->dev, "%s - returns %u\n", __func__, chars);
969 return chars;
970}
971
972
973static void cypress_throttle(struct tty_struct *tty)
974{
975 struct usb_serial_port *port = tty->driver_data;
976 struct cypress_private *priv = usb_get_serial_port_data(port);
977
978 spin_lock_irq(&priv->lock);
979 priv->rx_flags = THROTTLED;
980 spin_unlock_irq(&priv->lock);
981}
982
983
984static void cypress_unthrottle(struct tty_struct *tty)
985{
986 struct usb_serial_port *port = tty->driver_data;
987 struct cypress_private *priv = usb_get_serial_port_data(port);
988 int actually_throttled, result;
989
990 spin_lock_irq(&priv->lock);
991 actually_throttled = priv->rx_flags & ACTUALLY_THROTTLED;
992 priv->rx_flags = 0;
993 spin_unlock_irq(&priv->lock);
994
995 if (!priv->comm_is_ok)
996 return;
997
998 if (actually_throttled) {
999 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
1000 if (result) {
1001 dev_err(&port->dev, "%s - failed submitting read urb, "
1002 "error %d\n", __func__, result);
1003 cypress_set_dead(port);
1004 }
1005 }
1006}
1007
1008
1009static void cypress_read_int_callback(struct urb *urb)
1010{
1011 struct usb_serial_port *port = urb->context;
1012 struct cypress_private *priv = usb_get_serial_port_data(port);
1013 struct device *dev = &urb->dev->dev;
1014 struct tty_struct *tty;
1015 unsigned char *data = urb->transfer_buffer;
1016 unsigned long flags;
1017 char tty_flag = TTY_NORMAL;
1018 int bytes = 0;
1019 int result;
1020 int i = 0;
1021 int status = urb->status;
1022
1023 switch (status) {
1024 case 0: /* success */
1025 break;
1026 case -ECONNRESET:
1027 case -ENOENT:
1028 case -ESHUTDOWN:
1029 /* precursor to disconnect so just go away */
1030 return;
1031 case -EPIPE:
1032 /* Can't call usb_clear_halt while in_interrupt */
1033 fallthrough;
1034 default:
1035 /* something ugly is going on... */
1036 dev_err(dev, "%s - unexpected nonzero read status received: %d\n",
1037 __func__, status);
1038 cypress_set_dead(port);
1039 return;
1040 }
1041
1042 spin_lock_irqsave(&priv->lock, flags);
1043 if (priv->rx_flags & THROTTLED) {
1044 dev_dbg(dev, "%s - now throttling\n", __func__);
1045 priv->rx_flags |= ACTUALLY_THROTTLED;
1046 spin_unlock_irqrestore(&priv->lock, flags);
1047 return;
1048 }
1049 spin_unlock_irqrestore(&priv->lock, flags);
1050
1051 tty = tty_port_tty_get(&port->port);
1052 if (!tty) {
1053 dev_dbg(dev, "%s - bad tty pointer - exiting\n", __func__);
1054 return;
1055 }
1056
1057 spin_lock_irqsave(&priv->lock, flags);
1058 result = urb->actual_length;
1059 switch (priv->pkt_fmt) {
1060 default:
1061 case packet_format_1:
1062 /* This is for the CY7C64013... */
1063 priv->current_status = data[0] & 0xF8;
1064 bytes = data[1] + 2;
1065 i = 2;
1066 break;
1067 case packet_format_2:
1068 /* This is for the CY7C63743... */
1069 priv->current_status = data[0] & 0xF8;
1070 bytes = (data[0] & 0x07) + 1;
1071 i = 1;
1072 break;
1073 }
1074 spin_unlock_irqrestore(&priv->lock, flags);
1075 if (result < bytes) {
1076 dev_dbg(dev,
1077 "%s - wrong packet size - received %d bytes but packet said %d bytes\n",
1078 __func__, result, bytes);
1079 goto continue_read;
1080 }
1081
1082 usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
1083
1084 spin_lock_irqsave(&priv->lock, flags);
1085 /* check to see if status has changed */
1086 if (priv->current_status != priv->prev_status) {
1087 u8 delta = priv->current_status ^ priv->prev_status;
1088
1089 if (delta & UART_MSR_MASK) {
1090 if (delta & UART_CTS)
1091 port->icount.cts++;
1092 if (delta & UART_DSR)
1093 port->icount.dsr++;
1094 if (delta & UART_RI)
1095 port->icount.rng++;
1096 if (delta & UART_CD)
1097 port->icount.dcd++;
1098
1099 wake_up_interruptible(&port->port.delta_msr_wait);
1100 }
1101
1102 priv->prev_status = priv->current_status;
1103 }
1104 spin_unlock_irqrestore(&priv->lock, flags);
1105
1106 /* hangup, as defined in acm.c... this might be a bad place for it
1107 * though */
1108 if (tty && !C_CLOCAL(tty) && !(priv->current_status & UART_CD)) {
1109 dev_dbg(dev, "%s - calling hangup\n", __func__);
1110 tty_hangup(tty);
1111 goto continue_read;
1112 }
1113
1114 /* There is one error bit... I'm assuming it is a parity error
1115 * indicator as the generic firmware will set this bit to 1 if a
1116 * parity error occurs.
1117 * I can not find reference to any other error events. */
1118 spin_lock_irqsave(&priv->lock, flags);
1119 if (priv->current_status & CYP_ERROR) {
1120 spin_unlock_irqrestore(&priv->lock, flags);
1121 tty_flag = TTY_PARITY;
1122 dev_dbg(dev, "%s - Parity Error detected\n", __func__);
1123 } else
1124 spin_unlock_irqrestore(&priv->lock, flags);
1125
1126 /* process read if there is data other than line status */
1127 if (bytes > i) {
1128 tty_insert_flip_string_fixed_flag(&port->port, data + i,
1129 tty_flag, bytes - i);
1130 tty_flip_buffer_push(&port->port);
1131 }
1132
1133 spin_lock_irqsave(&priv->lock, flags);
1134 /* control and status byte(s) are also counted */
1135 priv->bytes_in += bytes;
1136 spin_unlock_irqrestore(&priv->lock, flags);
1137
1138continue_read:
1139 tty_kref_put(tty);
1140
1141 /* Continue trying to always read */
1142
1143 if (priv->comm_is_ok) {
1144 usb_fill_int_urb(port->interrupt_in_urb, port->serial->dev,
1145 usb_rcvintpipe(port->serial->dev,
1146 port->interrupt_in_endpointAddress),
1147 port->interrupt_in_urb->transfer_buffer,
1148 port->interrupt_in_urb->transfer_buffer_length,
1149 cypress_read_int_callback, port,
1150 priv->read_urb_interval);
1151 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
1152 if (result && result != -EPERM) {
1153 dev_err(dev, "%s - failed resubmitting read urb, error %d\n",
1154 __func__, result);
1155 cypress_set_dead(port);
1156 }
1157 }
1158} /* cypress_read_int_callback */
1159
1160
1161static void cypress_write_int_callback(struct urb *urb)
1162{
1163 struct usb_serial_port *port = urb->context;
1164 struct cypress_private *priv = usb_get_serial_port_data(port);
1165 struct device *dev = &urb->dev->dev;
1166 int status = urb->status;
1167
1168 switch (status) {
1169 case 0:
1170 /* success */
1171 break;
1172 case -ECONNRESET:
1173 case -ENOENT:
1174 case -ESHUTDOWN:
1175 /* this urb is terminated, clean up */
1176 dev_dbg(dev, "%s - urb shutting down with status: %d\n",
1177 __func__, status);
1178 priv->write_urb_in_use = 0;
1179 return;
1180 case -EPIPE:
1181 /* Cannot call usb_clear_halt while in_interrupt */
1182 fallthrough;
1183 default:
1184 dev_err(dev, "%s - unexpected nonzero write status received: %d\n",
1185 __func__, status);
1186 cypress_set_dead(port);
1187 break;
1188 }
1189 priv->write_urb_in_use = 0;
1190
1191 /* send any buffered data */
1192 cypress_send(port);
1193}
1194
1195module_usb_serial_driver(serial_drivers, id_table_combined);
1196
1197MODULE_AUTHOR(DRIVER_AUTHOR);
1198MODULE_DESCRIPTION(DRIVER_DESC);
1199MODULE_LICENSE("GPL");
1200
1201module_param(stats, bool, 0644);
1202MODULE_PARM_DESC(stats, "Enable statistics or not");
1203module_param(interval, int, 0644);
1204MODULE_PARM_DESC(interval, "Overrides interrupt interval");
1205module_param(unstable_bauds, bool, 0644);
1206MODULE_PARM_DESC(unstable_bauds, "Allow unstable baud rates");