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 */
54 static int klsi_105_port_probe(struct usb_serial_port *port);
55 static void klsi_105_port_remove(struct usb_serial_port *port);
56 static int klsi_105_open(struct tty_struct *tty, struct usb_serial_port *port);
57 static void klsi_105_close(struct usb_serial_port *port);
58 static void klsi_105_set_termios(struct tty_struct *tty,
59 struct usb_serial_port *port, struct ktermios *old);
60 static int klsi_105_tiocmget(struct tty_struct *tty);
61 static void klsi_105_process_read_urb(struct urb *urb);
62 static 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 */
68 static const struct usb_device_id id_table[] = {
69 { USB_DEVICE(PALMCONNECT_VID, PALMCONNECT_PID) },
70 { } /* Terminating entry */
71 };
72
73 MODULE_DEVICE_TABLE(usb, id_table);
74
75 static struct usb_serial_driver kl5kusb105d_device = {
76 .driver = {
77 .owner = THIS_MODULE,
78 .name = "kl5kusb105d",
79 },
80 .description = "KL5KUSB105D / PalmConnect",
81 .id_table = id_table,
82 .num_ports = 1,
83 .bulk_out_size = 64,
84 .open = klsi_105_open,
85 .close = klsi_105_close,
86 .set_termios = klsi_105_set_termios,
87 .tiocmget = klsi_105_tiocmget,
88 .port_probe = klsi_105_port_probe,
89 .port_remove = klsi_105_port_remove,
90 .throttle = usb_serial_generic_throttle,
91 .unthrottle = usb_serial_generic_unthrottle,
92 .process_read_urb = klsi_105_process_read_urb,
93 .prepare_write_buffer = klsi_105_prepare_write_buffer,
94 };
95
96 static struct usb_serial_driver * const serial_drivers[] = {
97 &kl5kusb105d_device, NULL
98 };
99
100 struct klsi_105_port_settings {
101 u8 pktlen; /* always 5, it seems */
102 u8 baudrate;
103 u8 databits;
104 u8 unknown1;
105 u8 unknown2;
106 };
107
108 struct klsi_105_private {
109 struct klsi_105_port_settings cfg;
110 unsigned long line_state; /* modem line settings */
111 spinlock_t lock;
112 };
113
114
115 /*
116 * Handle vendor specific USB requests
117 */
118
119
120 #define KLSI_TIMEOUT 5000 /* default urb timeout */
121
klsi_105_chg_port_settings(struct usb_serial_port * port,struct klsi_105_port_settings * settings)122 static int klsi_105_chg_port_settings(struct usb_serial_port *port,
123 struct klsi_105_port_settings *settings)
124 {
125 int rc;
126
127 rc = usb_control_msg_send(port->serial->dev,
128 0,
129 KL5KUSB105A_SIO_SET_DATA,
130 USB_TYPE_VENDOR | USB_DIR_OUT |
131 USB_RECIP_INTERFACE,
132 0, /* value */
133 0, /* index */
134 settings,
135 sizeof(struct klsi_105_port_settings),
136 KLSI_TIMEOUT,
137 GFP_KERNEL);
138 if (rc)
139 dev_err(&port->dev,
140 "Change port settings failed (error = %d)\n", rc);
141
142 dev_dbg(&port->dev,
143 "pktlen %u, baudrate 0x%02x, databits %u, u1 %u, u2 %u\n",
144 settings->pktlen, settings->baudrate, settings->databits,
145 settings->unknown1, settings->unknown2);
146
147 return rc;
148 }
149
150 /*
151 * Read line control via vendor command and return result through
152 * the state pointer.
153 */
klsi_105_get_line_state(struct usb_serial_port * port,unsigned long * state)154 static int klsi_105_get_line_state(struct usb_serial_port *port,
155 unsigned long *state)
156 {
157 u16 status;
158 int rc;
159
160 rc = usb_control_msg_recv(port->serial->dev, 0,
161 KL5KUSB105A_SIO_POLL,
162 USB_TYPE_VENDOR | USB_DIR_IN,
163 0, /* value */
164 0, /* index */
165 &status, sizeof(status),
166 10000,
167 GFP_KERNEL);
168 if (rc) {
169 dev_err(&port->dev, "reading line status failed: %d\n", rc);
170 return rc;
171 }
172
173 le16_to_cpus(&status);
174
175 dev_dbg(&port->dev, "read status %04x\n", status);
176
177 *state = ((status & KL5KUSB105A_DSR) ? TIOCM_DSR : 0) |
178 ((status & KL5KUSB105A_CTS) ? TIOCM_CTS : 0);
179
180 return 0;
181 }
182
183
184 /*
185 * Driver's tty interface functions
186 */
187
klsi_105_port_probe(struct usb_serial_port * port)188 static int klsi_105_port_probe(struct usb_serial_port *port)
189 {
190 struct klsi_105_private *priv;
191
192 priv = kmalloc(sizeof(*priv), GFP_KERNEL);
193 if (!priv)
194 return -ENOMEM;
195
196 /* set initial values for control structures */
197 priv->cfg.pktlen = 5;
198 priv->cfg.baudrate = kl5kusb105a_sio_b9600;
199 priv->cfg.databits = kl5kusb105a_dtb_8;
200 priv->cfg.unknown1 = 0;
201 priv->cfg.unknown2 = 1;
202
203 priv->line_state = 0;
204
205 spin_lock_init(&priv->lock);
206
207 usb_set_serial_port_data(port, priv);
208
209 return 0;
210 }
211
klsi_105_port_remove(struct usb_serial_port * port)212 static void klsi_105_port_remove(struct usb_serial_port *port)
213 {
214 struct klsi_105_private *priv;
215
216 priv = usb_get_serial_port_data(port);
217 kfree(priv);
218 }
219
klsi_105_open(struct tty_struct * tty,struct usb_serial_port * port)220 static int klsi_105_open(struct tty_struct *tty, struct usb_serial_port *port)
221 {
222 struct klsi_105_private *priv = usb_get_serial_port_data(port);
223 int retval = 0;
224 int rc;
225 unsigned long line_state;
226 struct klsi_105_port_settings cfg;
227 unsigned long flags;
228
229 /* Do a defined restart:
230 * Set up sane default baud rate and send the 'READ_ON'
231 * vendor command.
232 * FIXME: set modem line control (how?)
233 * Then read the modem line control and store values in
234 * priv->line_state.
235 */
236
237 cfg.pktlen = 5;
238 cfg.baudrate = kl5kusb105a_sio_b9600;
239 cfg.databits = kl5kusb105a_dtb_8;
240 cfg.unknown1 = 0;
241 cfg.unknown2 = 1;
242 klsi_105_chg_port_settings(port, &cfg);
243
244 spin_lock_irqsave(&priv->lock, flags);
245 priv->cfg.pktlen = cfg.pktlen;
246 priv->cfg.baudrate = cfg.baudrate;
247 priv->cfg.databits = cfg.databits;
248 priv->cfg.unknown1 = cfg.unknown1;
249 priv->cfg.unknown2 = cfg.unknown2;
250 spin_unlock_irqrestore(&priv->lock, flags);
251
252 /* READ_ON and urb submission */
253 rc = usb_serial_generic_open(tty, port);
254 if (rc)
255 return rc;
256
257 rc = usb_control_msg(port->serial->dev,
258 usb_sndctrlpipe(port->serial->dev, 0),
259 KL5KUSB105A_SIO_CONFIGURE,
260 USB_TYPE_VENDOR|USB_DIR_OUT|USB_RECIP_INTERFACE,
261 KL5KUSB105A_SIO_CONFIGURE_READ_ON,
262 0, /* index */
263 NULL,
264 0,
265 KLSI_TIMEOUT);
266 if (rc < 0) {
267 dev_err(&port->dev, "Enabling read failed (error = %d)\n", rc);
268 retval = rc;
269 goto err_generic_close;
270 } else
271 dev_dbg(&port->dev, "%s - enabled reading\n", __func__);
272
273 rc = klsi_105_get_line_state(port, &line_state);
274 if (rc < 0) {
275 retval = rc;
276 goto err_disable_read;
277 }
278
279 spin_lock_irqsave(&priv->lock, flags);
280 priv->line_state = line_state;
281 spin_unlock_irqrestore(&priv->lock, flags);
282 dev_dbg(&port->dev, "%s - read line state 0x%lx\n", __func__,
283 line_state);
284
285 return 0;
286
287 err_disable_read:
288 usb_control_msg(port->serial->dev,
289 usb_sndctrlpipe(port->serial->dev, 0),
290 KL5KUSB105A_SIO_CONFIGURE,
291 USB_TYPE_VENDOR | USB_DIR_OUT,
292 KL5KUSB105A_SIO_CONFIGURE_READ_OFF,
293 0, /* index */
294 NULL, 0,
295 KLSI_TIMEOUT);
296 err_generic_close:
297 usb_serial_generic_close(port);
298
299 return retval;
300 }
301
klsi_105_close(struct usb_serial_port * port)302 static void klsi_105_close(struct usb_serial_port *port)
303 {
304 int rc;
305
306 /* send READ_OFF */
307 rc = usb_control_msg(port->serial->dev,
308 usb_sndctrlpipe(port->serial->dev, 0),
309 KL5KUSB105A_SIO_CONFIGURE,
310 USB_TYPE_VENDOR | USB_DIR_OUT,
311 KL5KUSB105A_SIO_CONFIGURE_READ_OFF,
312 0, /* index */
313 NULL, 0,
314 KLSI_TIMEOUT);
315 if (rc < 0)
316 dev_err(&port->dev, "failed to disable read: %d\n", rc);
317
318 /* shutdown our bulk reads and writes */
319 usb_serial_generic_close(port);
320 }
321
322 /* We need to write a complete 64-byte data block and encode the
323 * number actually sent in the first double-byte, LSB-order. That
324 * leaves at most 62 bytes of payload.
325 */
326 #define KLSI_HDR_LEN 2
klsi_105_prepare_write_buffer(struct usb_serial_port * port,void * dest,size_t size)327 static int klsi_105_prepare_write_buffer(struct usb_serial_port *port,
328 void *dest, size_t size)
329 {
330 unsigned char *buf = dest;
331 int count;
332
333 count = kfifo_out_locked(&port->write_fifo, buf + KLSI_HDR_LEN, size,
334 &port->lock);
335 put_unaligned_le16(count, buf);
336
337 return count + KLSI_HDR_LEN;
338 }
339
340 /* The data received is preceded by a length double-byte in LSB-first order.
341 */
klsi_105_process_read_urb(struct urb * urb)342 static void klsi_105_process_read_urb(struct urb *urb)
343 {
344 struct usb_serial_port *port = urb->context;
345 unsigned char *data = urb->transfer_buffer;
346 unsigned len;
347
348 /* empty urbs seem to happen, we ignore them */
349 if (!urb->actual_length)
350 return;
351
352 if (urb->actual_length <= KLSI_HDR_LEN) {
353 dev_dbg(&port->dev, "%s - malformed packet\n", __func__);
354 return;
355 }
356
357 len = get_unaligned_le16(data);
358 if (len > urb->actual_length - KLSI_HDR_LEN) {
359 dev_dbg(&port->dev, "%s - packet length mismatch\n", __func__);
360 len = urb->actual_length - KLSI_HDR_LEN;
361 }
362
363 tty_insert_flip_string(&port->port, data + KLSI_HDR_LEN, len);
364 tty_flip_buffer_push(&port->port);
365 }
366
klsi_105_set_termios(struct tty_struct * tty,struct usb_serial_port * port,struct ktermios * old_termios)367 static void klsi_105_set_termios(struct tty_struct *tty,
368 struct usb_serial_port *port,
369 struct ktermios *old_termios)
370 {
371 struct klsi_105_private *priv = usb_get_serial_port_data(port);
372 struct device *dev = &port->dev;
373 unsigned int iflag = tty->termios.c_iflag;
374 unsigned int old_iflag = old_termios->c_iflag;
375 unsigned int cflag = tty->termios.c_cflag;
376 unsigned int old_cflag = old_termios->c_cflag;
377 struct klsi_105_port_settings *cfg;
378 unsigned long flags;
379 speed_t baud;
380
381 cfg = kmalloc(sizeof(*cfg), GFP_KERNEL);
382 if (!cfg)
383 return;
384
385 /* lock while we are modifying the settings */
386 spin_lock_irqsave(&priv->lock, flags);
387
388 /*
389 * Update baud rate
390 */
391 baud = tty_get_baud_rate(tty);
392
393 switch (baud) {
394 case 0: /* handled below */
395 break;
396 case 1200:
397 priv->cfg.baudrate = kl5kusb105a_sio_b1200;
398 break;
399 case 2400:
400 priv->cfg.baudrate = kl5kusb105a_sio_b2400;
401 break;
402 case 4800:
403 priv->cfg.baudrate = kl5kusb105a_sio_b4800;
404 break;
405 case 9600:
406 priv->cfg.baudrate = kl5kusb105a_sio_b9600;
407 break;
408 case 19200:
409 priv->cfg.baudrate = kl5kusb105a_sio_b19200;
410 break;
411 case 38400:
412 priv->cfg.baudrate = kl5kusb105a_sio_b38400;
413 break;
414 case 57600:
415 priv->cfg.baudrate = kl5kusb105a_sio_b57600;
416 break;
417 case 115200:
418 priv->cfg.baudrate = kl5kusb105a_sio_b115200;
419 break;
420 default:
421 dev_dbg(dev, "unsupported baudrate, using 9600\n");
422 priv->cfg.baudrate = kl5kusb105a_sio_b9600;
423 baud = 9600;
424 break;
425 }
426
427 /*
428 * FIXME: implement B0 handling
429 *
430 * Maybe this should be simulated by sending read disable and read
431 * enable messages?
432 */
433
434 tty_encode_baud_rate(tty, baud, baud);
435
436 if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
437 /* set the number of data bits */
438 switch (cflag & CSIZE) {
439 case CS5:
440 dev_dbg(dev, "%s - 5 bits/byte not supported\n", __func__);
441 spin_unlock_irqrestore(&priv->lock, flags);
442 goto err;
443 case CS6:
444 dev_dbg(dev, "%s - 6 bits/byte not supported\n", __func__);
445 spin_unlock_irqrestore(&priv->lock, flags);
446 goto err;
447 case CS7:
448 priv->cfg.databits = kl5kusb105a_dtb_7;
449 break;
450 case CS8:
451 priv->cfg.databits = kl5kusb105a_dtb_8;
452 break;
453 default:
454 dev_err(dev, "CSIZE was not CS5-CS8, using default of 8\n");
455 priv->cfg.databits = kl5kusb105a_dtb_8;
456 break;
457 }
458 }
459
460 /*
461 * Update line control register (LCR)
462 */
463 if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))
464 || (cflag & CSTOPB) != (old_cflag & CSTOPB)) {
465 /* Not currently supported */
466 tty->termios.c_cflag &= ~(PARENB|PARODD|CSTOPB);
467 }
468 /*
469 * Set flow control: well, I do not really now how to handle DTR/RTS.
470 * Just do what we have seen with SniffUSB on Win98.
471 */
472 if ((iflag & IXOFF) != (old_iflag & IXOFF)
473 || (iflag & IXON) != (old_iflag & IXON)
474 || (cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
475 /* Not currently supported */
476 tty->termios.c_cflag &= ~CRTSCTS;
477 }
478 memcpy(cfg, &priv->cfg, sizeof(*cfg));
479 spin_unlock_irqrestore(&priv->lock, flags);
480
481 /* now commit changes to device */
482 klsi_105_chg_port_settings(port, cfg);
483 err:
484 kfree(cfg);
485 }
486
klsi_105_tiocmget(struct tty_struct * tty)487 static int klsi_105_tiocmget(struct tty_struct *tty)
488 {
489 struct usb_serial_port *port = tty->driver_data;
490 struct klsi_105_private *priv = usb_get_serial_port_data(port);
491 unsigned long flags;
492 int rc;
493 unsigned long line_state;
494
495 rc = klsi_105_get_line_state(port, &line_state);
496 if (rc < 0) {
497 dev_err(&port->dev,
498 "Reading line control failed (error = %d)\n", rc);
499 /* better return value? EAGAIN? */
500 return rc;
501 }
502
503 spin_lock_irqsave(&priv->lock, flags);
504 priv->line_state = line_state;
505 spin_unlock_irqrestore(&priv->lock, flags);
506 dev_dbg(&port->dev, "%s - read line state 0x%lx\n", __func__, line_state);
507 return (int)line_state;
508 }
509
510 module_usb_serial_driver(serial_drivers, id_table);
511
512 MODULE_AUTHOR(DRIVER_AUTHOR);
513 MODULE_DESCRIPTION(DRIVER_DESC);
514 MODULE_LICENSE("GPL");
515