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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
52static int 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 */
65static int klsi_105_startup(struct usb_serial *serial);
66static void klsi_105_release(struct usb_serial *serial);
67static int klsi_105_open(struct tty_struct *tty, struct usb_serial_port *port);
68static void klsi_105_close(struct usb_serial_port *port);
69static void klsi_105_set_termios(struct tty_struct *tty,
70 struct usb_serial_port *port, struct ktermios *old);
71static int klsi_105_tiocmget(struct tty_struct *tty);
72static int klsi_105_tiocmset(struct tty_struct *tty,
73 unsigned int set, unsigned int clear);
74static void klsi_105_process_read_urb(struct urb *urb);
75static 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 */
81static 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
87MODULE_DEVICE_TABLE(usb, id_table);
88
89static struct usb_driver kl5kusb105d_driver = {
90 .name = "kl5kusb105d",
91 .probe = usb_serial_probe,
92 .disconnect = usb_serial_disconnect,
93 .id_table = id_table,
94 .no_dynamic_id = 1,
95};
96
97static struct usb_serial_driver kl5kusb105d_device = {
98 .driver = {
99 .owner = THIS_MODULE,
100 .name = "kl5kusb105d",
101 },
102 .description = "KL5KUSB105D / PalmConnect",
103 .usb_driver = &kl5kusb105d_driver,
104 .id_table = id_table,
105 .num_ports = 1,
106 .bulk_out_size = 64,
107 .open = klsi_105_open,
108 .close = klsi_105_close,
109 .set_termios = klsi_105_set_termios,
110 /*.break_ctl = klsi_105_break_ctl,*/
111 .tiocmget = klsi_105_tiocmget,
112 .tiocmset = klsi_105_tiocmset,
113 .attach = klsi_105_startup,
114 .release = klsi_105_release,
115 .throttle = usb_serial_generic_throttle,
116 .unthrottle = usb_serial_generic_unthrottle,
117 .process_read_urb = klsi_105_process_read_urb,
118 .prepare_write_buffer = klsi_105_prepare_write_buffer,
119};
120
121struct klsi_105_port_settings {
122 __u8 pktlen; /* always 5, it seems */
123 __u8 baudrate;
124 __u8 databits;
125 __u8 unknown1;
126 __u8 unknown2;
127} __attribute__ ((packed));
128
129struct klsi_105_private {
130 struct klsi_105_port_settings cfg;
131 struct ktermios termios;
132 unsigned long line_state; /* modem line settings */
133 spinlock_t lock;
134};
135
136
137/*
138 * Handle vendor specific USB requests
139 */
140
141
142#define KLSI_TIMEOUT 5000 /* default urb timeout */
143
144static int klsi_105_chg_port_settings(struct usb_serial_port *port,
145 struct klsi_105_port_settings *settings)
146{
147 int rc;
148
149 rc = usb_control_msg(port->serial->dev,
150 usb_sndctrlpipe(port->serial->dev, 0),
151 KL5KUSB105A_SIO_SET_DATA,
152 USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_INTERFACE,
153 0, /* value */
154 0, /* index */
155 settings,
156 sizeof(struct klsi_105_port_settings),
157 KLSI_TIMEOUT);
158 if (rc < 0)
159 dev_err(&port->dev,
160 "Change port settings failed (error = %d)\n", rc);
161 dev_info(&port->serial->dev->dev,
162 "%d byte block, baudrate %x, databits %d, u1 %d, u2 %d\n",
163 settings->pktlen, settings->baudrate, settings->databits,
164 settings->unknown1, settings->unknown2);
165 return rc;
166}
167
168/* translate a 16-bit status value from the device to linux's TIO bits */
169static unsigned long klsi_105_status2linestate(const __u16 status)
170{
171 unsigned long res = 0;
172
173 res = ((status & KL5KUSB105A_DSR) ? TIOCM_DSR : 0)
174 | ((status & KL5KUSB105A_CTS) ? TIOCM_CTS : 0)
175 ;
176
177 return res;
178}
179
180/*
181 * Read line control via vendor command and return result through
182 * *line_state_p
183 */
184/* It seems that the status buffer has always only 2 bytes length */
185#define KLSI_STATUSBUF_LEN 2
186static int klsi_105_get_line_state(struct usb_serial_port *port,
187 unsigned long *line_state_p)
188{
189 int rc;
190 u8 *status_buf;
191 __u16 status;
192
193 dev_info(&port->serial->dev->dev, "sending SIO Poll request\n");
194
195 status_buf = kmalloc(KLSI_STATUSBUF_LEN, GFP_KERNEL);
196 if (!status_buf) {
197 dev_err(&port->dev, "%s - out of memory for status buffer.\n",
198 __func__);
199 return -ENOMEM;
200 }
201 status_buf[0] = 0xff;
202 status_buf[1] = 0xff;
203 rc = usb_control_msg(port->serial->dev,
204 usb_rcvctrlpipe(port->serial->dev, 0),
205 KL5KUSB105A_SIO_POLL,
206 USB_TYPE_VENDOR | USB_DIR_IN,
207 0, /* value */
208 0, /* index */
209 status_buf, KLSI_STATUSBUF_LEN,
210 10000
211 );
212 if (rc < 0)
213 dev_err(&port->dev, "Reading line status failed (error = %d)\n",
214 rc);
215 else {
216 status = get_unaligned_le16(status_buf);
217
218 dev_info(&port->serial->dev->dev, "read status %x %x",
219 status_buf[0], status_buf[1]);
220
221 *line_state_p = klsi_105_status2linestate(status);
222 }
223
224 kfree(status_buf);
225 return rc;
226}
227
228
229/*
230 * Driver's tty interface functions
231 */
232
233static int klsi_105_startup(struct usb_serial *serial)
234{
235 struct klsi_105_private *priv;
236 int i;
237
238 /* check if we support the product id (see keyspan.c)
239 * FIXME
240 */
241
242 /* allocate the private data structure */
243 for (i = 0; i < serial->num_ports; i++) {
244 priv = kmalloc(sizeof(struct klsi_105_private),
245 GFP_KERNEL);
246 if (!priv) {
247 dbg("%skmalloc for klsi_105_private failed.", __func__);
248 i--;
249 goto err_cleanup;
250 }
251 /* set initial values for control structures */
252 priv->cfg.pktlen = 5;
253 priv->cfg.baudrate = kl5kusb105a_sio_b9600;
254 priv->cfg.databits = kl5kusb105a_dtb_8;
255 priv->cfg.unknown1 = 0;
256 priv->cfg.unknown2 = 1;
257
258 priv->line_state = 0;
259
260 usb_set_serial_port_data(serial->port[i], priv);
261
262 spin_lock_init(&priv->lock);
263
264 /* priv->termios is left uninitialized until port opening */
265 init_waitqueue_head(&serial->port[i]->write_wait);
266 }
267
268 return 0;
269
270err_cleanup:
271 for (; i >= 0; i--) {
272 priv = usb_get_serial_port_data(serial->port[i]);
273 kfree(priv);
274 usb_set_serial_port_data(serial->port[i], NULL);
275 }
276 return -ENOMEM;
277}
278
279static void klsi_105_release(struct usb_serial *serial)
280{
281 int i;
282
283 dbg("%s", __func__);
284
285 for (i = 0; i < serial->num_ports; ++i)
286 kfree(usb_get_serial_port_data(serial->port[i]));
287}
288
289static int klsi_105_open(struct tty_struct *tty, struct usb_serial_port *port)
290{
291 struct klsi_105_private *priv = usb_get_serial_port_data(port);
292 int retval = 0;
293 int rc;
294 int i;
295 unsigned long line_state;
296 struct klsi_105_port_settings *cfg;
297 unsigned long flags;
298
299 dbg("%s port %d", __func__, port->number);
300
301 /* Do a defined restart:
302 * Set up sane default baud rate and send the 'READ_ON'
303 * vendor command.
304 * FIXME: set modem line control (how?)
305 * Then read the modem line control and store values in
306 * priv->line_state.
307 */
308 cfg = kmalloc(sizeof(*cfg), GFP_KERNEL);
309 if (!cfg) {
310 dev_err(&port->dev, "%s - out of memory for config buffer.\n",
311 __func__);
312 return -ENOMEM;
313 }
314 cfg->pktlen = 5;
315 cfg->baudrate = kl5kusb105a_sio_b9600;
316 cfg->databits = kl5kusb105a_dtb_8;
317 cfg->unknown1 = 0;
318 cfg->unknown2 = 1;
319 klsi_105_chg_port_settings(port, cfg);
320
321 /* set up termios structure */
322 spin_lock_irqsave(&priv->lock, flags);
323 priv->termios.c_iflag = tty->termios->c_iflag;
324 priv->termios.c_oflag = tty->termios->c_oflag;
325 priv->termios.c_cflag = tty->termios->c_cflag;
326 priv->termios.c_lflag = tty->termios->c_lflag;
327 for (i = 0; i < NCCS; i++)
328 priv->termios.c_cc[i] = tty->termios->c_cc[i];
329 priv->cfg.pktlen = cfg->pktlen;
330 priv->cfg.baudrate = cfg->baudrate;
331 priv->cfg.databits = cfg->databits;
332 priv->cfg.unknown1 = cfg->unknown1;
333 priv->cfg.unknown2 = cfg->unknown2;
334 spin_unlock_irqrestore(&priv->lock, flags);
335
336 /* READ_ON and urb submission */
337 rc = usb_serial_generic_open(tty, port);
338 if (rc) {
339 retval = rc;
340 goto exit;
341 }
342
343 rc = usb_control_msg(port->serial->dev,
344 usb_sndctrlpipe(port->serial->dev, 0),
345 KL5KUSB105A_SIO_CONFIGURE,
346 USB_TYPE_VENDOR|USB_DIR_OUT|USB_RECIP_INTERFACE,
347 KL5KUSB105A_SIO_CONFIGURE_READ_ON,
348 0, /* index */
349 NULL,
350 0,
351 KLSI_TIMEOUT);
352 if (rc < 0) {
353 dev_err(&port->dev, "Enabling read failed (error = %d)\n", rc);
354 retval = rc;
355 } else
356 dbg("%s - enabled reading", __func__);
357
358 rc = klsi_105_get_line_state(port, &line_state);
359 if (rc >= 0) {
360 spin_lock_irqsave(&priv->lock, flags);
361 priv->line_state = line_state;
362 spin_unlock_irqrestore(&priv->lock, flags);
363 dbg("%s - read line state 0x%lx", __func__, line_state);
364 retval = 0;
365 } else
366 retval = rc;
367
368exit:
369 kfree(cfg);
370 return retval;
371}
372
373static void klsi_105_close(struct usb_serial_port *port)
374{
375 int rc;
376
377 dbg("%s port %d", __func__, port->number);
378
379 mutex_lock(&port->serial->disc_mutex);
380 if (!port->serial->disconnected) {
381 /* send READ_OFF */
382 rc = usb_control_msg(port->serial->dev,
383 usb_sndctrlpipe(port->serial->dev, 0),
384 KL5KUSB105A_SIO_CONFIGURE,
385 USB_TYPE_VENDOR | USB_DIR_OUT,
386 KL5KUSB105A_SIO_CONFIGURE_READ_OFF,
387 0, /* index */
388 NULL, 0,
389 KLSI_TIMEOUT);
390 if (rc < 0)
391 dev_err(&port->dev,
392 "Disabling read failed (error = %d)\n", rc);
393 }
394 mutex_unlock(&port->serial->disc_mutex);
395
396 /* shutdown our bulk reads and writes */
397 usb_serial_generic_close(port);
398
399 /* wgg - do I need this? I think so. */
400 usb_kill_urb(port->interrupt_in_urb);
401}
402
403/* We need to write a complete 64-byte data block and encode the
404 * number actually sent in the first double-byte, LSB-order. That
405 * leaves at most 62 bytes of payload.
406 */
407#define KLSI_HDR_LEN 2
408static int klsi_105_prepare_write_buffer(struct usb_serial_port *port,
409 void *dest, size_t size)
410{
411 unsigned char *buf = dest;
412 int count;
413
414 count = kfifo_out_locked(&port->write_fifo, buf + KLSI_HDR_LEN, size,
415 &port->lock);
416 put_unaligned_le16(count, buf);
417
418 return count + KLSI_HDR_LEN;
419}
420
421/* The data received is preceded by a length double-byte in LSB-first order.
422 */
423static void klsi_105_process_read_urb(struct urb *urb)
424{
425 struct usb_serial_port *port = urb->context;
426 unsigned char *data = urb->transfer_buffer;
427 struct tty_struct *tty;
428 unsigned len;
429
430 /* empty urbs seem to happen, we ignore them */
431 if (!urb->actual_length)
432 return;
433
434 if (urb->actual_length <= KLSI_HDR_LEN) {
435 dbg("%s - malformed packet", __func__);
436 return;
437 }
438
439 tty = tty_port_tty_get(&port->port);
440 if (!tty)
441 return;
442
443 len = get_unaligned_le16(data);
444 if (len > urb->actual_length - KLSI_HDR_LEN) {
445 dbg("%s - packet length mismatch", __func__);
446 len = urb->actual_length - KLSI_HDR_LEN;
447 }
448
449 tty_insert_flip_string(tty, data + KLSI_HDR_LEN, len);
450 tty_flip_buffer_push(tty);
451 tty_kref_put(tty);
452}
453
454static void klsi_105_set_termios(struct tty_struct *tty,
455 struct usb_serial_port *port,
456 struct ktermios *old_termios)
457{
458 struct klsi_105_private *priv = usb_get_serial_port_data(port);
459 unsigned int iflag = tty->termios->c_iflag;
460 unsigned int old_iflag = old_termios->c_iflag;
461 unsigned int cflag = tty->termios->c_cflag;
462 unsigned int old_cflag = old_termios->c_cflag;
463 struct klsi_105_port_settings *cfg;
464 unsigned long flags;
465 speed_t baud;
466
467 cfg = kmalloc(sizeof(*cfg), GFP_KERNEL);
468 if (!cfg) {
469 dev_err(&port->dev, "%s - out of memory for config buffer.\n",
470 __func__);
471 return;
472 }
473
474 /* lock while we are modifying the settings */
475 spin_lock_irqsave(&priv->lock, flags);
476
477 /*
478 * Update baud rate
479 */
480 baud = tty_get_baud_rate(tty);
481
482 if ((cflag & CBAUD) != (old_cflag & CBAUD)) {
483 /* reassert DTR and (maybe) RTS on transition from B0 */
484 if ((old_cflag & CBAUD) == B0) {
485 dbg("%s: baud was B0", __func__);
486#if 0
487 priv->control_state |= TIOCM_DTR;
488 /* don't set RTS if using hardware flow control */
489 if (!(old_cflag & CRTSCTS))
490 priv->control_state |= TIOCM_RTS;
491 mct_u232_set_modem_ctrl(serial, priv->control_state);
492#endif
493 }
494 }
495 switch (baud) {
496 case 0: /* handled below */
497 break;
498 case 1200:
499 priv->cfg.baudrate = kl5kusb105a_sio_b1200;
500 break;
501 case 2400:
502 priv->cfg.baudrate = kl5kusb105a_sio_b2400;
503 break;
504 case 4800:
505 priv->cfg.baudrate = kl5kusb105a_sio_b4800;
506 break;
507 case 9600:
508 priv->cfg.baudrate = kl5kusb105a_sio_b9600;
509 break;
510 case 19200:
511 priv->cfg.baudrate = kl5kusb105a_sio_b19200;
512 break;
513 case 38400:
514 priv->cfg.baudrate = kl5kusb105a_sio_b38400;
515 break;
516 case 57600:
517 priv->cfg.baudrate = kl5kusb105a_sio_b57600;
518 break;
519 case 115200:
520 priv->cfg.baudrate = kl5kusb105a_sio_b115200;
521 break;
522 default:
523 dbg("KLSI USB->Serial converter:"
524 " unsupported baudrate request, using default of 9600");
525 priv->cfg.baudrate = kl5kusb105a_sio_b9600;
526 baud = 9600;
527 break;
528 }
529 if ((cflag & CBAUD) == B0) {
530 dbg("%s: baud is B0", __func__);
531 /* Drop RTS and DTR */
532 /* maybe this should be simulated by sending read
533 * disable and read enable messages?
534 */
535 ;
536#if 0
537 priv->control_state &= ~(TIOCM_DTR | TIOCM_RTS);
538 mct_u232_set_modem_ctrl(serial, priv->control_state);
539#endif
540 }
541 tty_encode_baud_rate(tty, baud, baud);
542
543 if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
544 /* set the number of data bits */
545 switch (cflag & CSIZE) {
546 case CS5:
547 dbg("%s - 5 bits/byte not supported", __func__);
548 spin_unlock_irqrestore(&priv->lock, flags);
549 goto err;
550 case CS6:
551 dbg("%s - 6 bits/byte not supported", __func__);
552 spin_unlock_irqrestore(&priv->lock, flags);
553 goto err;
554 case CS7:
555 priv->cfg.databits = kl5kusb105a_dtb_7;
556 break;
557 case CS8:
558 priv->cfg.databits = kl5kusb105a_dtb_8;
559 break;
560 default:
561 dev_err(&port->dev,
562 "CSIZE was not CS5-CS8, using default of 8\n");
563 priv->cfg.databits = kl5kusb105a_dtb_8;
564 break;
565 }
566 }
567
568 /*
569 * Update line control register (LCR)
570 */
571 if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))
572 || (cflag & CSTOPB) != (old_cflag & CSTOPB)) {
573 /* Not currently supported */
574 tty->termios->c_cflag &= ~(PARENB|PARODD|CSTOPB);
575#if 0
576 priv->last_lcr = 0;
577
578 /* set the parity */
579 if (cflag & PARENB)
580 priv->last_lcr |= (cflag & PARODD) ?
581 MCT_U232_PARITY_ODD : MCT_U232_PARITY_EVEN;
582 else
583 priv->last_lcr |= MCT_U232_PARITY_NONE;
584
585 /* set the number of stop bits */
586 priv->last_lcr |= (cflag & CSTOPB) ?
587 MCT_U232_STOP_BITS_2 : MCT_U232_STOP_BITS_1;
588
589 mct_u232_set_line_ctrl(serial, priv->last_lcr);
590#endif
591 ;
592 }
593 /*
594 * Set flow control: well, I do not really now how to handle DTR/RTS.
595 * Just do what we have seen with SniffUSB on Win98.
596 */
597 if ((iflag & IXOFF) != (old_iflag & IXOFF)
598 || (iflag & IXON) != (old_iflag & IXON)
599 || (cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
600 /* Not currently supported */
601 tty->termios->c_cflag &= ~CRTSCTS;
602 /* Drop DTR/RTS if no flow control otherwise assert */
603#if 0
604 if ((iflag & IXOFF) || (iflag & IXON) || (cflag & CRTSCTS))
605 priv->control_state |= TIOCM_DTR | TIOCM_RTS;
606 else
607 priv->control_state &= ~(TIOCM_DTR | TIOCM_RTS);
608 mct_u232_set_modem_ctrl(serial, priv->control_state);
609#endif
610 ;
611 }
612 memcpy(cfg, &priv->cfg, sizeof(*cfg));
613 spin_unlock_irqrestore(&priv->lock, flags);
614
615 /* now commit changes to device */
616 klsi_105_chg_port_settings(port, cfg);
617err:
618 kfree(cfg);
619}
620
621#if 0
622static void mct_u232_break_ctl(struct tty_struct *tty, int break_state)
623{
624 struct usb_serial_port *port = tty->driver_data;
625 struct usb_serial *serial = port->serial;
626 struct mct_u232_private *priv =
627 (struct mct_u232_private *)port->private;
628 unsigned char lcr = priv->last_lcr;
629
630 dbg("%sstate=%d", __func__, break_state);
631
632 /* LOCKING */
633 if (break_state)
634 lcr |= MCT_U232_SET_BREAK;
635
636 mct_u232_set_line_ctrl(serial, lcr);
637}
638#endif
639
640static int klsi_105_tiocmget(struct tty_struct *tty)
641{
642 struct usb_serial_port *port = tty->driver_data;
643 struct klsi_105_private *priv = usb_get_serial_port_data(port);
644 unsigned long flags;
645 int rc;
646 unsigned long line_state;
647 dbg("%s - request, just guessing", __func__);
648
649 rc = klsi_105_get_line_state(port, &line_state);
650 if (rc < 0) {
651 dev_err(&port->dev,
652 "Reading line control failed (error = %d)\n", rc);
653 /* better return value? EAGAIN? */
654 return rc;
655 }
656
657 spin_lock_irqsave(&priv->lock, flags);
658 priv->line_state = line_state;
659 spin_unlock_irqrestore(&priv->lock, flags);
660 dbg("%s - read line state 0x%lx", __func__, line_state);
661 return (int)line_state;
662}
663
664static int klsi_105_tiocmset(struct tty_struct *tty,
665 unsigned int set, unsigned int clear)
666{
667 int retval = -EINVAL;
668
669 dbg("%s", __func__);
670
671/* if this ever gets implemented, it should be done something like this:
672 struct usb_serial *serial = port->serial;
673 struct klsi_105_private *priv = usb_get_serial_port_data(port);
674 unsigned long flags;
675 int control;
676
677 spin_lock_irqsave (&priv->lock, flags);
678 if (set & TIOCM_RTS)
679 priv->control_state |= TIOCM_RTS;
680 if (set & TIOCM_DTR)
681 priv->control_state |= TIOCM_DTR;
682 if (clear & TIOCM_RTS)
683 priv->control_state &= ~TIOCM_RTS;
684 if (clear & TIOCM_DTR)
685 priv->control_state &= ~TIOCM_DTR;
686 control = priv->control_state;
687 spin_unlock_irqrestore (&priv->lock, flags);
688 retval = mct_u232_set_modem_ctrl(serial, control);
689*/
690 return retval;
691}
692
693
694static int __init klsi_105_init(void)
695{
696 int retval;
697 retval = usb_serial_register(&kl5kusb105d_device);
698 if (retval)
699 goto failed_usb_serial_register;
700 retval = usb_register(&kl5kusb105d_driver);
701 if (retval)
702 goto failed_usb_register;
703
704 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
705 DRIVER_DESC "\n");
706 return 0;
707failed_usb_register:
708 usb_serial_deregister(&kl5kusb105d_device);
709failed_usb_serial_register:
710 return retval;
711}
712
713static void __exit klsi_105_exit(void)
714{
715 usb_deregister(&kl5kusb105d_driver);
716 usb_serial_deregister(&kl5kusb105d_device);
717}
718
719
720module_init(klsi_105_init);
721module_exit(klsi_105_exit);
722
723MODULE_AUTHOR(DRIVER_AUTHOR);
724MODULE_DESCRIPTION(DRIVER_DESC);
725MODULE_LICENSE("GPL");
726
727
728module_param(debug, bool, S_IRUGO | S_IWUSR);
729MODULE_PARM_DESC(debug, "enable extensive debugging messages");
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * KLSI KL5KUSB105 chip RS232 converter driver
4 *
5 * Copyright (C) 2010 Johan Hovold <jhovold@gmail.com>
6 * Copyright (C) 2001 Utz-Uwe Haus <haus@uuhaus.de>
7 *
8 * All information about the device was acquired using SniffUSB ans snoopUSB
9 * on Windows98.
10 * It was written out of frustration with the PalmConnect USB Serial adapter
11 * sold by Palm Inc.
12 * Neither Palm, nor their contractor (MCCI) or their supplier (KLSI) provided
13 * information that was not already available.
14 *
15 * It seems that KLSI bought some silicon-design information from ScanLogic,
16 * whose SL11R processor is at the core of the KL5KUSB chipset from KLSI.
17 * KLSI has firmware available for their devices; it is probable that the
18 * firmware differs from that used by KLSI in their products. If you have an
19 * original KLSI device and can provide some information on it, I would be
20 * most interested in adding support for it here. If you have any information
21 * on the protocol used (or find errors in my reverse-engineered stuff), please
22 * let me know.
23 *
24 * The code was only tested with a PalmConnect USB adapter; if you
25 * are adventurous, try it with any KLSI-based device and let me know how it
26 * breaks so that I can fix it!
27 */
28
29/* TODO:
30 * check modem line signals
31 * implement handshaking or decide that we do not support it
32 */
33
34#include <linux/kernel.h>
35#include <linux/errno.h>
36#include <linux/slab.h>
37#include <linux/tty.h>
38#include <linux/tty_driver.h>
39#include <linux/tty_flip.h>
40#include <linux/module.h>
41#include <linux/uaccess.h>
42#include <asm/unaligned.h>
43#include <linux/usb.h>
44#include <linux/usb/serial.h>
45#include "kl5kusb105.h"
46
47#define DRIVER_AUTHOR "Utz-Uwe Haus <haus@uuhaus.de>, Johan Hovold <jhovold@gmail.com>"
48#define DRIVER_DESC "KLSI KL5KUSB105 chipset USB->Serial Converter driver"
49
50
51/*
52 * Function prototypes
53 */
54static int klsi_105_port_probe(struct usb_serial_port *port);
55static int klsi_105_port_remove(struct usb_serial_port *port);
56static int klsi_105_open(struct tty_struct *tty, struct usb_serial_port *port);
57static void klsi_105_close(struct usb_serial_port *port);
58static void klsi_105_set_termios(struct tty_struct *tty,
59 struct usb_serial_port *port, struct ktermios *old);
60static int klsi_105_tiocmget(struct tty_struct *tty);
61static void klsi_105_process_read_urb(struct urb *urb);
62static int klsi_105_prepare_write_buffer(struct usb_serial_port *port,
63 void *dest, size_t size);
64
65/*
66 * All of the device info needed for the KLSI converters.
67 */
68static const struct usb_device_id id_table[] = {
69 { USB_DEVICE(PALMCONNECT_VID, PALMCONNECT_PID) },
70 { USB_DEVICE(KLSI_VID, KLSI_KL5KUSB105D_PID) },
71 { } /* Terminating entry */
72};
73
74MODULE_DEVICE_TABLE(usb, id_table);
75
76static struct usb_serial_driver kl5kusb105d_device = {
77 .driver = {
78 .owner = THIS_MODULE,
79 .name = "kl5kusb105d",
80 },
81 .description = "KL5KUSB105D / PalmConnect",
82 .id_table = id_table,
83 .num_ports = 1,
84 .bulk_out_size = 64,
85 .open = klsi_105_open,
86 .close = klsi_105_close,
87 .set_termios = klsi_105_set_termios,
88 .tiocmget = klsi_105_tiocmget,
89 .port_probe = klsi_105_port_probe,
90 .port_remove = klsi_105_port_remove,
91 .throttle = usb_serial_generic_throttle,
92 .unthrottle = usb_serial_generic_unthrottle,
93 .process_read_urb = klsi_105_process_read_urb,
94 .prepare_write_buffer = klsi_105_prepare_write_buffer,
95};
96
97static struct usb_serial_driver * const serial_drivers[] = {
98 &kl5kusb105d_device, NULL
99};
100
101struct klsi_105_port_settings {
102 u8 pktlen; /* always 5, it seems */
103 u8 baudrate;
104 u8 databits;
105 u8 unknown1;
106 u8 unknown2;
107};
108
109struct klsi_105_private {
110 struct klsi_105_port_settings cfg;
111 unsigned long line_state; /* modem line settings */
112 spinlock_t lock;
113};
114
115
116/*
117 * Handle vendor specific USB requests
118 */
119
120
121#define KLSI_TIMEOUT 5000 /* default urb timeout */
122
123static int klsi_105_chg_port_settings(struct usb_serial_port *port,
124 struct klsi_105_port_settings *settings)
125{
126 int rc;
127
128 rc = usb_control_msg(port->serial->dev,
129 usb_sndctrlpipe(port->serial->dev, 0),
130 KL5KUSB105A_SIO_SET_DATA,
131 USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_INTERFACE,
132 0, /* value */
133 0, /* index */
134 settings,
135 sizeof(struct klsi_105_port_settings),
136 KLSI_TIMEOUT);
137 if (rc < 0)
138 dev_err(&port->dev,
139 "Change port settings failed (error = %d)\n", rc);
140
141 dev_dbg(&port->dev,
142 "pktlen %u, baudrate 0x%02x, databits %u, u1 %u, u2 %u\n",
143 settings->pktlen, settings->baudrate, settings->databits,
144 settings->unknown1, settings->unknown2);
145
146 return rc;
147}
148
149/* translate a 16-bit status value from the device to linux's TIO bits */
150static unsigned long klsi_105_status2linestate(const __u16 status)
151{
152 unsigned long res = 0;
153
154 res = ((status & KL5KUSB105A_DSR) ? TIOCM_DSR : 0)
155 | ((status & KL5KUSB105A_CTS) ? TIOCM_CTS : 0)
156 ;
157
158 return res;
159}
160
161/*
162 * Read line control via vendor command and return result through
163 * *line_state_p
164 */
165/* It seems that the status buffer has always only 2 bytes length */
166#define KLSI_STATUSBUF_LEN 2
167static int klsi_105_get_line_state(struct usb_serial_port *port,
168 unsigned long *line_state_p)
169{
170 int rc;
171 u8 *status_buf;
172 __u16 status;
173
174 status_buf = kmalloc(KLSI_STATUSBUF_LEN, GFP_KERNEL);
175 if (!status_buf)
176 return -ENOMEM;
177
178 status_buf[0] = 0xff;
179 status_buf[1] = 0xff;
180 rc = usb_control_msg(port->serial->dev,
181 usb_rcvctrlpipe(port->serial->dev, 0),
182 KL5KUSB105A_SIO_POLL,
183 USB_TYPE_VENDOR | USB_DIR_IN,
184 0, /* value */
185 0, /* index */
186 status_buf, KLSI_STATUSBUF_LEN,
187 10000
188 );
189 if (rc != KLSI_STATUSBUF_LEN) {
190 dev_err(&port->dev, "reading line status failed: %d\n", rc);
191 if (rc >= 0)
192 rc = -EIO;
193 } else {
194 status = get_unaligned_le16(status_buf);
195
196 dev_dbg(&port->dev, "read status %02x %02x\n",
197 status_buf[0], status_buf[1]);
198
199 *line_state_p = klsi_105_status2linestate(status);
200 }
201
202 kfree(status_buf);
203 return rc;
204}
205
206
207/*
208 * Driver's tty interface functions
209 */
210
211static int klsi_105_port_probe(struct usb_serial_port *port)
212{
213 struct klsi_105_private *priv;
214
215 priv = kmalloc(sizeof(*priv), GFP_KERNEL);
216 if (!priv)
217 return -ENOMEM;
218
219 /* set initial values for control structures */
220 priv->cfg.pktlen = 5;
221 priv->cfg.baudrate = kl5kusb105a_sio_b9600;
222 priv->cfg.databits = kl5kusb105a_dtb_8;
223 priv->cfg.unknown1 = 0;
224 priv->cfg.unknown2 = 1;
225
226 priv->line_state = 0;
227
228 spin_lock_init(&priv->lock);
229
230 usb_set_serial_port_data(port, priv);
231
232 return 0;
233}
234
235static int klsi_105_port_remove(struct usb_serial_port *port)
236{
237 struct klsi_105_private *priv;
238
239 priv = usb_get_serial_port_data(port);
240 kfree(priv);
241
242 return 0;
243}
244
245static int klsi_105_open(struct tty_struct *tty, struct usb_serial_port *port)
246{
247 struct klsi_105_private *priv = usb_get_serial_port_data(port);
248 int retval = 0;
249 int rc;
250 unsigned long line_state;
251 struct klsi_105_port_settings *cfg;
252 unsigned long flags;
253
254 /* Do a defined restart:
255 * Set up sane default baud rate and send the 'READ_ON'
256 * vendor command.
257 * FIXME: set modem line control (how?)
258 * Then read the modem line control and store values in
259 * priv->line_state.
260 */
261 cfg = kmalloc(sizeof(*cfg), GFP_KERNEL);
262 if (!cfg)
263 return -ENOMEM;
264
265 cfg->pktlen = 5;
266 cfg->baudrate = kl5kusb105a_sio_b9600;
267 cfg->databits = kl5kusb105a_dtb_8;
268 cfg->unknown1 = 0;
269 cfg->unknown2 = 1;
270 klsi_105_chg_port_settings(port, cfg);
271
272 spin_lock_irqsave(&priv->lock, flags);
273 priv->cfg.pktlen = cfg->pktlen;
274 priv->cfg.baudrate = cfg->baudrate;
275 priv->cfg.databits = cfg->databits;
276 priv->cfg.unknown1 = cfg->unknown1;
277 priv->cfg.unknown2 = cfg->unknown2;
278 spin_unlock_irqrestore(&priv->lock, flags);
279
280 /* READ_ON and urb submission */
281 rc = usb_serial_generic_open(tty, port);
282 if (rc) {
283 retval = rc;
284 goto err_free_cfg;
285 }
286
287 rc = usb_control_msg(port->serial->dev,
288 usb_sndctrlpipe(port->serial->dev, 0),
289 KL5KUSB105A_SIO_CONFIGURE,
290 USB_TYPE_VENDOR|USB_DIR_OUT|USB_RECIP_INTERFACE,
291 KL5KUSB105A_SIO_CONFIGURE_READ_ON,
292 0, /* index */
293 NULL,
294 0,
295 KLSI_TIMEOUT);
296 if (rc < 0) {
297 dev_err(&port->dev, "Enabling read failed (error = %d)\n", rc);
298 retval = rc;
299 goto err_generic_close;
300 } else
301 dev_dbg(&port->dev, "%s - enabled reading\n", __func__);
302
303 rc = klsi_105_get_line_state(port, &line_state);
304 if (rc < 0) {
305 retval = rc;
306 goto err_disable_read;
307 }
308
309 spin_lock_irqsave(&priv->lock, flags);
310 priv->line_state = line_state;
311 spin_unlock_irqrestore(&priv->lock, flags);
312 dev_dbg(&port->dev, "%s - read line state 0x%lx\n", __func__,
313 line_state);
314
315 return 0;
316
317err_disable_read:
318 usb_control_msg(port->serial->dev,
319 usb_sndctrlpipe(port->serial->dev, 0),
320 KL5KUSB105A_SIO_CONFIGURE,
321 USB_TYPE_VENDOR | USB_DIR_OUT,
322 KL5KUSB105A_SIO_CONFIGURE_READ_OFF,
323 0, /* index */
324 NULL, 0,
325 KLSI_TIMEOUT);
326err_generic_close:
327 usb_serial_generic_close(port);
328err_free_cfg:
329 kfree(cfg);
330
331 return retval;
332}
333
334static void klsi_105_close(struct usb_serial_port *port)
335{
336 int rc;
337
338 /* send READ_OFF */
339 rc = usb_control_msg(port->serial->dev,
340 usb_sndctrlpipe(port->serial->dev, 0),
341 KL5KUSB105A_SIO_CONFIGURE,
342 USB_TYPE_VENDOR | USB_DIR_OUT,
343 KL5KUSB105A_SIO_CONFIGURE_READ_OFF,
344 0, /* index */
345 NULL, 0,
346 KLSI_TIMEOUT);
347 if (rc < 0)
348 dev_err(&port->dev, "failed to disable read: %d\n", rc);
349
350 /* shutdown our bulk reads and writes */
351 usb_serial_generic_close(port);
352}
353
354/* We need to write a complete 64-byte data block and encode the
355 * number actually sent in the first double-byte, LSB-order. That
356 * leaves at most 62 bytes of payload.
357 */
358#define KLSI_HDR_LEN 2
359static int klsi_105_prepare_write_buffer(struct usb_serial_port *port,
360 void *dest, size_t size)
361{
362 unsigned char *buf = dest;
363 int count;
364
365 count = kfifo_out_locked(&port->write_fifo, buf + KLSI_HDR_LEN, size,
366 &port->lock);
367 put_unaligned_le16(count, buf);
368
369 return count + KLSI_HDR_LEN;
370}
371
372/* The data received is preceded by a length double-byte in LSB-first order.
373 */
374static void klsi_105_process_read_urb(struct urb *urb)
375{
376 struct usb_serial_port *port = urb->context;
377 unsigned char *data = urb->transfer_buffer;
378 unsigned len;
379
380 /* empty urbs seem to happen, we ignore them */
381 if (!urb->actual_length)
382 return;
383
384 if (urb->actual_length <= KLSI_HDR_LEN) {
385 dev_dbg(&port->dev, "%s - malformed packet\n", __func__);
386 return;
387 }
388
389 len = get_unaligned_le16(data);
390 if (len > urb->actual_length - KLSI_HDR_LEN) {
391 dev_dbg(&port->dev, "%s - packet length mismatch\n", __func__);
392 len = urb->actual_length - KLSI_HDR_LEN;
393 }
394
395 tty_insert_flip_string(&port->port, data + KLSI_HDR_LEN, len);
396 tty_flip_buffer_push(&port->port);
397}
398
399static void klsi_105_set_termios(struct tty_struct *tty,
400 struct usb_serial_port *port,
401 struct ktermios *old_termios)
402{
403 struct klsi_105_private *priv = usb_get_serial_port_data(port);
404 struct device *dev = &port->dev;
405 unsigned int iflag = tty->termios.c_iflag;
406 unsigned int old_iflag = old_termios->c_iflag;
407 unsigned int cflag = tty->termios.c_cflag;
408 unsigned int old_cflag = old_termios->c_cflag;
409 struct klsi_105_port_settings *cfg;
410 unsigned long flags;
411 speed_t baud;
412
413 cfg = kmalloc(sizeof(*cfg), GFP_KERNEL);
414 if (!cfg)
415 return;
416
417 /* lock while we are modifying the settings */
418 spin_lock_irqsave(&priv->lock, flags);
419
420 /*
421 * Update baud rate
422 */
423 baud = tty_get_baud_rate(tty);
424
425 switch (baud) {
426 case 0: /* handled below */
427 break;
428 case 1200:
429 priv->cfg.baudrate = kl5kusb105a_sio_b1200;
430 break;
431 case 2400:
432 priv->cfg.baudrate = kl5kusb105a_sio_b2400;
433 break;
434 case 4800:
435 priv->cfg.baudrate = kl5kusb105a_sio_b4800;
436 break;
437 case 9600:
438 priv->cfg.baudrate = kl5kusb105a_sio_b9600;
439 break;
440 case 19200:
441 priv->cfg.baudrate = kl5kusb105a_sio_b19200;
442 break;
443 case 38400:
444 priv->cfg.baudrate = kl5kusb105a_sio_b38400;
445 break;
446 case 57600:
447 priv->cfg.baudrate = kl5kusb105a_sio_b57600;
448 break;
449 case 115200:
450 priv->cfg.baudrate = kl5kusb105a_sio_b115200;
451 break;
452 default:
453 dev_dbg(dev, "unsupported baudrate, using 9600\n");
454 priv->cfg.baudrate = kl5kusb105a_sio_b9600;
455 baud = 9600;
456 break;
457 }
458
459 /*
460 * FIXME: implement B0 handling
461 *
462 * Maybe this should be simulated by sending read disable and read
463 * enable messages?
464 */
465
466 tty_encode_baud_rate(tty, baud, baud);
467
468 if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
469 /* set the number of data bits */
470 switch (cflag & CSIZE) {
471 case CS5:
472 dev_dbg(dev, "%s - 5 bits/byte not supported\n", __func__);
473 spin_unlock_irqrestore(&priv->lock, flags);
474 goto err;
475 case CS6:
476 dev_dbg(dev, "%s - 6 bits/byte not supported\n", __func__);
477 spin_unlock_irqrestore(&priv->lock, flags);
478 goto err;
479 case CS7:
480 priv->cfg.databits = kl5kusb105a_dtb_7;
481 break;
482 case CS8:
483 priv->cfg.databits = kl5kusb105a_dtb_8;
484 break;
485 default:
486 dev_err(dev, "CSIZE was not CS5-CS8, using default of 8\n");
487 priv->cfg.databits = kl5kusb105a_dtb_8;
488 break;
489 }
490 }
491
492 /*
493 * Update line control register (LCR)
494 */
495 if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))
496 || (cflag & CSTOPB) != (old_cflag & CSTOPB)) {
497 /* Not currently supported */
498 tty->termios.c_cflag &= ~(PARENB|PARODD|CSTOPB);
499 }
500 /*
501 * Set flow control: well, I do not really now how to handle DTR/RTS.
502 * Just do what we have seen with SniffUSB on Win98.
503 */
504 if ((iflag & IXOFF) != (old_iflag & IXOFF)
505 || (iflag & IXON) != (old_iflag & IXON)
506 || (cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
507 /* Not currently supported */
508 tty->termios.c_cflag &= ~CRTSCTS;
509 }
510 memcpy(cfg, &priv->cfg, sizeof(*cfg));
511 spin_unlock_irqrestore(&priv->lock, flags);
512
513 /* now commit changes to device */
514 klsi_105_chg_port_settings(port, cfg);
515err:
516 kfree(cfg);
517}
518
519static int klsi_105_tiocmget(struct tty_struct *tty)
520{
521 struct usb_serial_port *port = tty->driver_data;
522 struct klsi_105_private *priv = usb_get_serial_port_data(port);
523 unsigned long flags;
524 int rc;
525 unsigned long line_state;
526
527 rc = klsi_105_get_line_state(port, &line_state);
528 if (rc < 0) {
529 dev_err(&port->dev,
530 "Reading line control failed (error = %d)\n", rc);
531 /* better return value? EAGAIN? */
532 return rc;
533 }
534
535 spin_lock_irqsave(&priv->lock, flags);
536 priv->line_state = line_state;
537 spin_unlock_irqrestore(&priv->lock, flags);
538 dev_dbg(&port->dev, "%s - read line state 0x%lx\n", __func__, line_state);
539 return (int)line_state;
540}
541
542module_usb_serial_driver(serial_drivers, id_table);
543
544MODULE_AUTHOR(DRIVER_AUTHOR);
545MODULE_DESCRIPTION(DRIVER_DESC);
546MODULE_LICENSE("GPL");