1 /*
2 * KLSI KL5KUSB105 chip RS232 converter driver
3 *
4 * Copyright (C) 2010 Johan Hovold <jhovold@gmail.com>
5 * Copyright (C) 2001 Utz-Uwe Haus <haus@uuhaus.de>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * All information about the device was acquired using SniffUSB ans snoopUSB
13 * on Windows98.
14 * It was written out of frustration with the PalmConnect USB Serial adapter
15 * sold by Palm Inc.
16 * Neither Palm, nor their contractor (MCCI) or their supplier (KLSI) provided
17 * information that was not already available.
18 *
19 * It seems that KLSI bought some silicon-design information from ScanLogic,
20 * whose SL11R processor is at the core of the KL5KUSB chipset from KLSI.
21 * KLSI has firmware available for their devices; it is probable that the
22 * firmware differs from that used by KLSI in their products. If you have an
23 * original KLSI device and can provide some information on it, I would be
24 * most interested in adding support for it here. If you have any information
25 * on the protocol used (or find errors in my reverse-engineered stuff), please
26 * let me know.
27 *
28 * The code was only tested with a PalmConnect USB adapter; if you
29 * are adventurous, try it with any KLSI-based device and let me know how it
30 * breaks so that I can fix it!
31 */
32
33 /* TODO:
34 * check modem line signals
35 * implement handshaking or decide that we do not support it
36 */
37
38 #include <linux/kernel.h>
39 #include <linux/errno.h>
40 #include <linux/init.h>
41 #include <linux/slab.h>
42 #include <linux/tty.h>
43 #include <linux/tty_driver.h>
44 #include <linux/tty_flip.h>
45 #include <linux/module.h>
46 #include <linux/uaccess.h>
47 #include <asm/unaligned.h>
48 #include <linux/usb.h>
49 #include <linux/usb/serial.h>
50 #include "kl5kusb105.h"
51
52 static bool debug;
53
54 /*
55 * Version Information
56 */
57 #define DRIVER_VERSION "v0.4"
58 #define DRIVER_AUTHOR "Utz-Uwe Haus <haus@uuhaus.de>, Johan Hovold <jhovold@gmail.com>"
59 #define DRIVER_DESC "KLSI KL5KUSB105 chipset USB->Serial Converter driver"
60
61
62 /*
63 * Function prototypes
64 */
65 static int klsi_105_startup(struct usb_serial *serial);
66 static void klsi_105_release(struct usb_serial *serial);
67 static int klsi_105_open(struct tty_struct *tty, struct usb_serial_port *port);
68 static void klsi_105_close(struct usb_serial_port *port);
69 static void klsi_105_set_termios(struct tty_struct *tty,
70 struct usb_serial_port *port, struct ktermios *old);
71 static int klsi_105_tiocmget(struct tty_struct *tty);
72 static int klsi_105_tiocmset(struct tty_struct *tty,
73 unsigned int set, unsigned int clear);
74 static void klsi_105_process_read_urb(struct urb *urb);
75 static int klsi_105_prepare_write_buffer(struct usb_serial_port *port,
76 void *dest, size_t size);
77
78 /*
79 * All of the device info needed for the KLSI converters.
80 */
81 static const struct usb_device_id id_table[] = {
82 { USB_DEVICE(PALMCONNECT_VID, PALMCONNECT_PID) },
83 { USB_DEVICE(KLSI_VID, KLSI_KL5KUSB105D_PID) },
84 { } /* Terminating entry */
85 };
86
87 MODULE_DEVICE_TABLE(usb, id_table);
88
89 static struct usb_driver kl5kusb105d_driver = {
90 .name = "kl5kusb105d",
91 .probe = usb_serial_probe,
92 .disconnect = usb_serial_disconnect,
93 .id_table = id_table,
94 };
95
96 static struct usb_serial_driver kl5kusb105d_device = {
97 .driver = {
98 .owner = THIS_MODULE,
99 .name = "kl5kusb105d",
100 },
101 .description = "KL5KUSB105D / PalmConnect",
102 .id_table = id_table,
103 .num_ports = 1,
104 .bulk_out_size = 64,
105 .open = klsi_105_open,
106 .close = klsi_105_close,
107 .set_termios = klsi_105_set_termios,
108 /*.break_ctl = klsi_105_break_ctl,*/
109 .tiocmget = klsi_105_tiocmget,
110 .tiocmset = klsi_105_tiocmset,
111 .attach = klsi_105_startup,
112 .release = klsi_105_release,
113 .throttle = usb_serial_generic_throttle,
114 .unthrottle = usb_serial_generic_unthrottle,
115 .process_read_urb = klsi_105_process_read_urb,
116 .prepare_write_buffer = klsi_105_prepare_write_buffer,
117 };
118
119 static struct usb_serial_driver * const serial_drivers[] = {
120 &kl5kusb105d_device, NULL
121 };
122
123 struct klsi_105_port_settings {
124 __u8 pktlen; /* always 5, it seems */
125 __u8 baudrate;
126 __u8 databits;
127 __u8 unknown1;
128 __u8 unknown2;
129 } __attribute__ ((packed));
130
131 struct klsi_105_private {
132 struct klsi_105_port_settings cfg;
133 struct ktermios termios;
134 unsigned long line_state; /* modem line settings */
135 spinlock_t lock;
136 };
137
138
139 /*
140 * Handle vendor specific USB requests
141 */
142
143
144 #define KLSI_TIMEOUT 5000 /* default urb timeout */
145
klsi_105_chg_port_settings(struct usb_serial_port * port,struct klsi_105_port_settings * settings)146 static int klsi_105_chg_port_settings(struct usb_serial_port *port,
147 struct klsi_105_port_settings *settings)
148 {
149 int rc;
150
151 rc = usb_control_msg(port->serial->dev,
152 usb_sndctrlpipe(port->serial->dev, 0),
153 KL5KUSB105A_SIO_SET_DATA,
154 USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_INTERFACE,
155 0, /* value */
156 0, /* index */
157 settings,
158 sizeof(struct klsi_105_port_settings),
159 KLSI_TIMEOUT);
160 if (rc < 0)
161 dev_err(&port->dev,
162 "Change port settings failed (error = %d)\n", rc);
163 dev_info(&port->serial->dev->dev,
164 "%d byte block, baudrate %x, databits %d, u1 %d, u2 %d\n",
165 settings->pktlen, settings->baudrate, settings->databits,
166 settings->unknown1, settings->unknown2);
167 return rc;
168 }
169
170 /* translate a 16-bit status value from the device to linux's TIO bits */
klsi_105_status2linestate(const __u16 status)171 static unsigned long klsi_105_status2linestate(const __u16 status)
172 {
173 unsigned long res = 0;
174
175 res = ((status & KL5KUSB105A_DSR) ? TIOCM_DSR : 0)
176 | ((status & KL5KUSB105A_CTS) ? TIOCM_CTS : 0)
177 ;
178
179 return res;
180 }
181
182 /*
183 * Read line control via vendor command and return result through
184 * *line_state_p
185 */
186 /* It seems that the status buffer has always only 2 bytes length */
187 #define KLSI_STATUSBUF_LEN 2
klsi_105_get_line_state(struct usb_serial_port * port,unsigned long * line_state_p)188 static int klsi_105_get_line_state(struct usb_serial_port *port,
189 unsigned long *line_state_p)
190 {
191 int rc;
192 u8 *status_buf;
193 __u16 status;
194
195 dev_info(&port->serial->dev->dev, "sending SIO Poll request\n");
196
197 status_buf = kmalloc(KLSI_STATUSBUF_LEN, GFP_KERNEL);
198 if (!status_buf) {
199 dev_err(&port->dev, "%s - out of memory for status buffer.\n",
200 __func__);
201 return -ENOMEM;
202 }
203 status_buf[0] = 0xff;
204 status_buf[1] = 0xff;
205 rc = usb_control_msg(port->serial->dev,
206 usb_rcvctrlpipe(port->serial->dev, 0),
207 KL5KUSB105A_SIO_POLL,
208 USB_TYPE_VENDOR | USB_DIR_IN,
209 0, /* value */
210 0, /* index */
211 status_buf, KLSI_STATUSBUF_LEN,
212 10000
213 );
214 if (rc < 0)
215 dev_err(&port->dev, "Reading line status failed (error = %d)\n",
216 rc);
217 else {
218 status = get_unaligned_le16(status_buf);
219
220 dev_info(&port->serial->dev->dev, "read status %x %x",
221 status_buf[0], status_buf[1]);
222
223 *line_state_p = klsi_105_status2linestate(status);
224 }
225
226 kfree(status_buf);
227 return rc;
228 }
229
230
231 /*
232 * Driver's tty interface functions
233 */
234
klsi_105_startup(struct usb_serial * serial)235 static int klsi_105_startup(struct usb_serial *serial)
236 {
237 struct klsi_105_private *priv;
238 int i;
239
240 /* check if we support the product id (see keyspan.c)
241 * FIXME
242 */
243
244 /* allocate the private data structure */
245 for (i = 0; i < serial->num_ports; i++) {
246 priv = kmalloc(sizeof(struct klsi_105_private),
247 GFP_KERNEL);
248 if (!priv) {
249 dbg("%skmalloc for klsi_105_private failed.", __func__);
250 i--;
251 goto err_cleanup;
252 }
253 /* set initial values for control structures */
254 priv->cfg.pktlen = 5;
255 priv->cfg.baudrate = kl5kusb105a_sio_b9600;
256 priv->cfg.databits = kl5kusb105a_dtb_8;
257 priv->cfg.unknown1 = 0;
258 priv->cfg.unknown2 = 1;
259
260 priv->line_state = 0;
261
262 usb_set_serial_port_data(serial->port[i], priv);
263
264 spin_lock_init(&priv->lock);
265
266 /* priv->termios is left uninitialized until port opening */
267 init_waitqueue_head(&serial->port[i]->write_wait);
268 }
269
270 return 0;
271
272 err_cleanup:
273 for (; i >= 0; i--) {
274 priv = usb_get_serial_port_data(serial->port[i]);
275 kfree(priv);
276 usb_set_serial_port_data(serial->port[i], NULL);
277 }
278 return -ENOMEM;
279 }
280
klsi_105_release(struct usb_serial * serial)281 static void klsi_105_release(struct usb_serial *serial)
282 {
283 int i;
284
285 dbg("%s", __func__);
286
287 for (i = 0; i < serial->num_ports; ++i)
288 kfree(usb_get_serial_port_data(serial->port[i]));
289 }
290
klsi_105_open(struct tty_struct * tty,struct usb_serial_port * port)291 static int klsi_105_open(struct tty_struct *tty, struct usb_serial_port *port)
292 {
293 struct klsi_105_private *priv = usb_get_serial_port_data(port);
294 int retval = 0;
295 int rc;
296 int i;
297 unsigned long line_state;
298 struct klsi_105_port_settings *cfg;
299 unsigned long flags;
300
301 dbg("%s port %d", __func__, port->number);
302
303 /* Do a defined restart:
304 * Set up sane default baud rate and send the 'READ_ON'
305 * vendor command.
306 * FIXME: set modem line control (how?)
307 * Then read the modem line control and store values in
308 * priv->line_state.
309 */
310 cfg = kmalloc(sizeof(*cfg), GFP_KERNEL);
311 if (!cfg) {
312 dev_err(&port->dev, "%s - out of memory for config buffer.\n",
313 __func__);
314 return -ENOMEM;
315 }
316 cfg->pktlen = 5;
317 cfg->baudrate = kl5kusb105a_sio_b9600;
318 cfg->databits = kl5kusb105a_dtb_8;
319 cfg->unknown1 = 0;
320 cfg->unknown2 = 1;
321 klsi_105_chg_port_settings(port, cfg);
322
323 /* set up termios structure */
324 spin_lock_irqsave(&priv->lock, flags);
325 priv->termios.c_iflag = tty->termios->c_iflag;
326 priv->termios.c_oflag = tty->termios->c_oflag;
327 priv->termios.c_cflag = tty->termios->c_cflag;
328 priv->termios.c_lflag = tty->termios->c_lflag;
329 for (i = 0; i < NCCS; i++)
330 priv->termios.c_cc[i] = tty->termios->c_cc[i];
331 priv->cfg.pktlen = cfg->pktlen;
332 priv->cfg.baudrate = cfg->baudrate;
333 priv->cfg.databits = cfg->databits;
334 priv->cfg.unknown1 = cfg->unknown1;
335 priv->cfg.unknown2 = cfg->unknown2;
336 spin_unlock_irqrestore(&priv->lock, flags);
337
338 /* READ_ON and urb submission */
339 rc = usb_serial_generic_open(tty, port);
340 if (rc) {
341 retval = rc;
342 goto exit;
343 }
344
345 rc = usb_control_msg(port->serial->dev,
346 usb_sndctrlpipe(port->serial->dev, 0),
347 KL5KUSB105A_SIO_CONFIGURE,
348 USB_TYPE_VENDOR|USB_DIR_OUT|USB_RECIP_INTERFACE,
349 KL5KUSB105A_SIO_CONFIGURE_READ_ON,
350 0, /* index */
351 NULL,
352 0,
353 KLSI_TIMEOUT);
354 if (rc < 0) {
355 dev_err(&port->dev, "Enabling read failed (error = %d)\n", rc);
356 retval = rc;
357 } else
358 dbg("%s - enabled reading", __func__);
359
360 rc = klsi_105_get_line_state(port, &line_state);
361 if (rc >= 0) {
362 spin_lock_irqsave(&priv->lock, flags);
363 priv->line_state = line_state;
364 spin_unlock_irqrestore(&priv->lock, flags);
365 dbg("%s - read line state 0x%lx", __func__, line_state);
366 retval = 0;
367 } else
368 retval = rc;
369
370 exit:
371 kfree(cfg);
372 return retval;
373 }
374
klsi_105_close(struct usb_serial_port * port)375 static void klsi_105_close(struct usb_serial_port *port)
376 {
377 int rc;
378
379 dbg("%s port %d", __func__, port->number);
380
381 mutex_lock(&port->serial->disc_mutex);
382 if (!port->serial->disconnected) {
383 /* send READ_OFF */
384 rc = usb_control_msg(port->serial->dev,
385 usb_sndctrlpipe(port->serial->dev, 0),
386 KL5KUSB105A_SIO_CONFIGURE,
387 USB_TYPE_VENDOR | USB_DIR_OUT,
388 KL5KUSB105A_SIO_CONFIGURE_READ_OFF,
389 0, /* index */
390 NULL, 0,
391 KLSI_TIMEOUT);
392 if (rc < 0)
393 dev_err(&port->dev,
394 "Disabling read failed (error = %d)\n", rc);
395 }
396 mutex_unlock(&port->serial->disc_mutex);
397
398 /* shutdown our bulk reads and writes */
399 usb_serial_generic_close(port);
400
401 /* wgg - do I need this? I think so. */
402 usb_kill_urb(port->interrupt_in_urb);
403 }
404
405 /* We need to write a complete 64-byte data block and encode the
406 * number actually sent in the first double-byte, LSB-order. That
407 * leaves at most 62 bytes of payload.
408 */
409 #define KLSI_HDR_LEN 2
klsi_105_prepare_write_buffer(struct usb_serial_port * port,void * dest,size_t size)410 static int klsi_105_prepare_write_buffer(struct usb_serial_port *port,
411 void *dest, size_t size)
412 {
413 unsigned char *buf = dest;
414 int count;
415
416 count = kfifo_out_locked(&port->write_fifo, buf + KLSI_HDR_LEN, size,
417 &port->lock);
418 put_unaligned_le16(count, buf);
419
420 return count + KLSI_HDR_LEN;
421 }
422
423 /* The data received is preceded by a length double-byte in LSB-first order.
424 */
klsi_105_process_read_urb(struct urb * urb)425 static void klsi_105_process_read_urb(struct urb *urb)
426 {
427 struct usb_serial_port *port = urb->context;
428 unsigned char *data = urb->transfer_buffer;
429 struct tty_struct *tty;
430 unsigned len;
431
432 /* empty urbs seem to happen, we ignore them */
433 if (!urb->actual_length)
434 return;
435
436 if (urb->actual_length <= KLSI_HDR_LEN) {
437 dbg("%s - malformed packet", __func__);
438 return;
439 }
440
441 tty = tty_port_tty_get(&port->port);
442 if (!tty)
443 return;
444
445 len = get_unaligned_le16(data);
446 if (len > urb->actual_length - KLSI_HDR_LEN) {
447 dbg("%s - packet length mismatch", __func__);
448 len = urb->actual_length - KLSI_HDR_LEN;
449 }
450
451 tty_insert_flip_string(tty, data + KLSI_HDR_LEN, len);
452 tty_flip_buffer_push(tty);
453 tty_kref_put(tty);
454 }
455
klsi_105_set_termios(struct tty_struct * tty,struct usb_serial_port * port,struct ktermios * old_termios)456 static void klsi_105_set_termios(struct tty_struct *tty,
457 struct usb_serial_port *port,
458 struct ktermios *old_termios)
459 {
460 struct klsi_105_private *priv = usb_get_serial_port_data(port);
461 unsigned int iflag = tty->termios->c_iflag;
462 unsigned int old_iflag = old_termios->c_iflag;
463 unsigned int cflag = tty->termios->c_cflag;
464 unsigned int old_cflag = old_termios->c_cflag;
465 struct klsi_105_port_settings *cfg;
466 unsigned long flags;
467 speed_t baud;
468
469 cfg = kmalloc(sizeof(*cfg), GFP_KERNEL);
470 if (!cfg) {
471 dev_err(&port->dev, "%s - out of memory for config buffer.\n",
472 __func__);
473 return;
474 }
475
476 /* lock while we are modifying the settings */
477 spin_lock_irqsave(&priv->lock, flags);
478
479 /*
480 * Update baud rate
481 */
482 baud = tty_get_baud_rate(tty);
483
484 if ((cflag & CBAUD) != (old_cflag & CBAUD)) {
485 /* reassert DTR and (maybe) RTS on transition from B0 */
486 if ((old_cflag & CBAUD) == B0) {
487 dbg("%s: baud was B0", __func__);
488 #if 0
489 priv->control_state |= TIOCM_DTR;
490 /* don't set RTS if using hardware flow control */
491 if (!(old_cflag & CRTSCTS))
492 priv->control_state |= TIOCM_RTS;
493 mct_u232_set_modem_ctrl(serial, priv->control_state);
494 #endif
495 }
496 }
497 switch (baud) {
498 case 0: /* handled below */
499 break;
500 case 1200:
501 priv->cfg.baudrate = kl5kusb105a_sio_b1200;
502 break;
503 case 2400:
504 priv->cfg.baudrate = kl5kusb105a_sio_b2400;
505 break;
506 case 4800:
507 priv->cfg.baudrate = kl5kusb105a_sio_b4800;
508 break;
509 case 9600:
510 priv->cfg.baudrate = kl5kusb105a_sio_b9600;
511 break;
512 case 19200:
513 priv->cfg.baudrate = kl5kusb105a_sio_b19200;
514 break;
515 case 38400:
516 priv->cfg.baudrate = kl5kusb105a_sio_b38400;
517 break;
518 case 57600:
519 priv->cfg.baudrate = kl5kusb105a_sio_b57600;
520 break;
521 case 115200:
522 priv->cfg.baudrate = kl5kusb105a_sio_b115200;
523 break;
524 default:
525 dbg("KLSI USB->Serial converter:"
526 " unsupported baudrate request, using default of 9600");
527 priv->cfg.baudrate = kl5kusb105a_sio_b9600;
528 baud = 9600;
529 break;
530 }
531 if ((cflag & CBAUD) == B0) {
532 dbg("%s: baud is B0", __func__);
533 /* Drop RTS and DTR */
534 /* maybe this should be simulated by sending read
535 * disable and read enable messages?
536 */
537 ;
538 #if 0
539 priv->control_state &= ~(TIOCM_DTR | TIOCM_RTS);
540 mct_u232_set_modem_ctrl(serial, priv->control_state);
541 #endif
542 }
543 tty_encode_baud_rate(tty, baud, baud);
544
545 if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
546 /* set the number of data bits */
547 switch (cflag & CSIZE) {
548 case CS5:
549 dbg("%s - 5 bits/byte not supported", __func__);
550 spin_unlock_irqrestore(&priv->lock, flags);
551 goto err;
552 case CS6:
553 dbg("%s - 6 bits/byte not supported", __func__);
554 spin_unlock_irqrestore(&priv->lock, flags);
555 goto err;
556 case CS7:
557 priv->cfg.databits = kl5kusb105a_dtb_7;
558 break;
559 case CS8:
560 priv->cfg.databits = kl5kusb105a_dtb_8;
561 break;
562 default:
563 dev_err(&port->dev,
564 "CSIZE was not CS5-CS8, using default of 8\n");
565 priv->cfg.databits = kl5kusb105a_dtb_8;
566 break;
567 }
568 }
569
570 /*
571 * Update line control register (LCR)
572 */
573 if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))
574 || (cflag & CSTOPB) != (old_cflag & CSTOPB)) {
575 /* Not currently supported */
576 tty->termios->c_cflag &= ~(PARENB|PARODD|CSTOPB);
577 #if 0
578 priv->last_lcr = 0;
579
580 /* set the parity */
581 if (cflag & PARENB)
582 priv->last_lcr |= (cflag & PARODD) ?
583 MCT_U232_PARITY_ODD : MCT_U232_PARITY_EVEN;
584 else
585 priv->last_lcr |= MCT_U232_PARITY_NONE;
586
587 /* set the number of stop bits */
588 priv->last_lcr |= (cflag & CSTOPB) ?
589 MCT_U232_STOP_BITS_2 : MCT_U232_STOP_BITS_1;
590
591 mct_u232_set_line_ctrl(serial, priv->last_lcr);
592 #endif
593 ;
594 }
595 /*
596 * Set flow control: well, I do not really now how to handle DTR/RTS.
597 * Just do what we have seen with SniffUSB on Win98.
598 */
599 if ((iflag & IXOFF) != (old_iflag & IXOFF)
600 || (iflag & IXON) != (old_iflag & IXON)
601 || (cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
602 /* Not currently supported */
603 tty->termios->c_cflag &= ~CRTSCTS;
604 /* Drop DTR/RTS if no flow control otherwise assert */
605 #if 0
606 if ((iflag & IXOFF) || (iflag & IXON) || (cflag & CRTSCTS))
607 priv->control_state |= TIOCM_DTR | TIOCM_RTS;
608 else
609 priv->control_state &= ~(TIOCM_DTR | TIOCM_RTS);
610 mct_u232_set_modem_ctrl(serial, priv->control_state);
611 #endif
612 ;
613 }
614 memcpy(cfg, &priv->cfg, sizeof(*cfg));
615 spin_unlock_irqrestore(&priv->lock, flags);
616
617 /* now commit changes to device */
618 klsi_105_chg_port_settings(port, cfg);
619 err:
620 kfree(cfg);
621 }
622
623 #if 0
624 static void mct_u232_break_ctl(struct tty_struct *tty, int break_state)
625 {
626 struct usb_serial_port *port = tty->driver_data;
627 struct usb_serial *serial = port->serial;
628 struct mct_u232_private *priv =
629 (struct mct_u232_private *)port->private;
630 unsigned char lcr = priv->last_lcr;
631
632 dbg("%sstate=%d", __func__, break_state);
633
634 /* LOCKING */
635 if (break_state)
636 lcr |= MCT_U232_SET_BREAK;
637
638 mct_u232_set_line_ctrl(serial, lcr);
639 }
640 #endif
641
klsi_105_tiocmget(struct tty_struct * tty)642 static int klsi_105_tiocmget(struct tty_struct *tty)
643 {
644 struct usb_serial_port *port = tty->driver_data;
645 struct klsi_105_private *priv = usb_get_serial_port_data(port);
646 unsigned long flags;
647 int rc;
648 unsigned long line_state;
649 dbg("%s - request, just guessing", __func__);
650
651 rc = klsi_105_get_line_state(port, &line_state);
652 if (rc < 0) {
653 dev_err(&port->dev,
654 "Reading line control failed (error = %d)\n", rc);
655 /* better return value? EAGAIN? */
656 return rc;
657 }
658
659 spin_lock_irqsave(&priv->lock, flags);
660 priv->line_state = line_state;
661 spin_unlock_irqrestore(&priv->lock, flags);
662 dbg("%s - read line state 0x%lx", __func__, line_state);
663 return (int)line_state;
664 }
665
klsi_105_tiocmset(struct tty_struct * tty,unsigned int set,unsigned int clear)666 static int klsi_105_tiocmset(struct tty_struct *tty,
667 unsigned int set, unsigned int clear)
668 {
669 int retval = -EINVAL;
670
671 dbg("%s", __func__);
672
673 /* if this ever gets implemented, it should be done something like this:
674 struct usb_serial *serial = port->serial;
675 struct klsi_105_private *priv = usb_get_serial_port_data(port);
676 unsigned long flags;
677 int control;
678
679 spin_lock_irqsave (&priv->lock, flags);
680 if (set & TIOCM_RTS)
681 priv->control_state |= TIOCM_RTS;
682 if (set & TIOCM_DTR)
683 priv->control_state |= TIOCM_DTR;
684 if (clear & TIOCM_RTS)
685 priv->control_state &= ~TIOCM_RTS;
686 if (clear & TIOCM_DTR)
687 priv->control_state &= ~TIOCM_DTR;
688 control = priv->control_state;
689 spin_unlock_irqrestore (&priv->lock, flags);
690 retval = mct_u232_set_modem_ctrl(serial, control);
691 */
692 return retval;
693 }
694
695 module_usb_serial_driver(kl5kusb105d_driver, serial_drivers);
696
697 MODULE_AUTHOR(DRIVER_AUTHOR);
698 MODULE_DESCRIPTION(DRIVER_DESC);
699 MODULE_LICENSE("GPL");
700
701 module_param(debug, bool, S_IRUGO | S_IWUSR);
702 MODULE_PARM_DESC(debug, "enable extensive debugging messages");
703