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1/*
2 * Fintek F81232 USB to serial adaptor driver
3 *
4 * Copyright (C) 2012 Greg Kroah-Hartman (gregkh@linuxfoundation.org)
5 * Copyright (C) 2012 Linux Foundation
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License version 2 as published by
9 * the Free Software Foundation.
10 *
11 */
12
13#include <linux/kernel.h>
14#include <linux/errno.h>
15#include <linux/slab.h>
16#include <linux/tty.h>
17#include <linux/tty_driver.h>
18#include <linux/tty_flip.h>
19#include <linux/serial.h>
20#include <linux/module.h>
21#include <linux/moduleparam.h>
22#include <linux/mutex.h>
23#include <linux/uaccess.h>
24#include <linux/usb.h>
25#include <linux/usb/serial.h>
26#include <linux/serial_reg.h>
27
28static const struct usb_device_id id_table[] = {
29 { USB_DEVICE(0x1934, 0x0706) },
30 { } /* Terminating entry */
31};
32MODULE_DEVICE_TABLE(usb, id_table);
33
34/* Maximum baudrate for F81232 */
35#define F81232_MAX_BAUDRATE 115200
36
37/* USB Control EP parameter */
38#define F81232_REGISTER_REQUEST 0xa0
39#define F81232_GET_REGISTER 0xc0
40#define F81232_SET_REGISTER 0x40
41
42#define SERIAL_BASE_ADDRESS 0x0120
43#define RECEIVE_BUFFER_REGISTER (0x00 + SERIAL_BASE_ADDRESS)
44#define INTERRUPT_ENABLE_REGISTER (0x01 + SERIAL_BASE_ADDRESS)
45#define FIFO_CONTROL_REGISTER (0x02 + SERIAL_BASE_ADDRESS)
46#define LINE_CONTROL_REGISTER (0x03 + SERIAL_BASE_ADDRESS)
47#define MODEM_CONTROL_REGISTER (0x04 + SERIAL_BASE_ADDRESS)
48#define MODEM_STATUS_REGISTER (0x06 + SERIAL_BASE_ADDRESS)
49
50struct f81232_private {
51 struct mutex lock;
52 u8 modem_control;
53 u8 modem_status;
54 struct work_struct interrupt_work;
55 struct usb_serial_port *port;
56};
57
58static int calc_baud_divisor(speed_t baudrate)
59{
60 return DIV_ROUND_CLOSEST(F81232_MAX_BAUDRATE, baudrate);
61}
62
63static int f81232_get_register(struct usb_serial_port *port, u16 reg, u8 *val)
64{
65 int status;
66 u8 *tmp;
67 struct usb_device *dev = port->serial->dev;
68
69 tmp = kmalloc(sizeof(*val), GFP_KERNEL);
70 if (!tmp)
71 return -ENOMEM;
72
73 status = usb_control_msg(dev,
74 usb_rcvctrlpipe(dev, 0),
75 F81232_REGISTER_REQUEST,
76 F81232_GET_REGISTER,
77 reg,
78 0,
79 tmp,
80 sizeof(*val),
81 USB_CTRL_GET_TIMEOUT);
82 if (status != sizeof(*val)) {
83 dev_err(&port->dev, "%s failed status: %d\n", __func__, status);
84
85 if (status < 0)
86 status = usb_translate_errors(status);
87 else
88 status = -EIO;
89 } else {
90 status = 0;
91 *val = *tmp;
92 }
93
94 kfree(tmp);
95 return status;
96}
97
98static int f81232_set_register(struct usb_serial_port *port, u16 reg, u8 val)
99{
100 int status;
101 u8 *tmp;
102 struct usb_device *dev = port->serial->dev;
103
104 tmp = kmalloc(sizeof(val), GFP_KERNEL);
105 if (!tmp)
106 return -ENOMEM;
107
108 *tmp = val;
109
110 status = usb_control_msg(dev,
111 usb_sndctrlpipe(dev, 0),
112 F81232_REGISTER_REQUEST,
113 F81232_SET_REGISTER,
114 reg,
115 0,
116 tmp,
117 sizeof(val),
118 USB_CTRL_SET_TIMEOUT);
119 if (status != sizeof(val)) {
120 dev_err(&port->dev, "%s failed status: %d\n", __func__, status);
121
122 if (status < 0)
123 status = usb_translate_errors(status);
124 else
125 status = -EIO;
126 } else {
127 status = 0;
128 }
129
130 kfree(tmp);
131 return status;
132}
133
134static void f81232_read_msr(struct usb_serial_port *port)
135{
136 int status;
137 u8 current_msr;
138 struct tty_struct *tty;
139 struct f81232_private *priv = usb_get_serial_port_data(port);
140
141 mutex_lock(&priv->lock);
142 status = f81232_get_register(port, MODEM_STATUS_REGISTER,
143 ¤t_msr);
144 if (status) {
145 dev_err(&port->dev, "%s fail, status: %d\n", __func__, status);
146 mutex_unlock(&priv->lock);
147 return;
148 }
149
150 if (!(current_msr & UART_MSR_ANY_DELTA)) {
151 mutex_unlock(&priv->lock);
152 return;
153 }
154
155 priv->modem_status = current_msr;
156
157 if (current_msr & UART_MSR_DCTS)
158 port->icount.cts++;
159 if (current_msr & UART_MSR_DDSR)
160 port->icount.dsr++;
161 if (current_msr & UART_MSR_TERI)
162 port->icount.rng++;
163 if (current_msr & UART_MSR_DDCD) {
164 port->icount.dcd++;
165 tty = tty_port_tty_get(&port->port);
166 if (tty) {
167 usb_serial_handle_dcd_change(port, tty,
168 current_msr & UART_MSR_DCD);
169
170 tty_kref_put(tty);
171 }
172 }
173
174 wake_up_interruptible(&port->port.delta_msr_wait);
175 mutex_unlock(&priv->lock);
176}
177
178static int f81232_set_mctrl(struct usb_serial_port *port,
179 unsigned int set, unsigned int clear)
180{
181 u8 val;
182 int status;
183 struct f81232_private *priv = usb_get_serial_port_data(port);
184
185 if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0)
186 return 0; /* no change */
187
188 /* 'set' takes precedence over 'clear' */
189 clear &= ~set;
190
191 /* force enable interrupt with OUT2 */
192 mutex_lock(&priv->lock);
193 val = UART_MCR_OUT2 | priv->modem_control;
194
195 if (clear & TIOCM_DTR)
196 val &= ~UART_MCR_DTR;
197
198 if (clear & TIOCM_RTS)
199 val &= ~UART_MCR_RTS;
200
201 if (set & TIOCM_DTR)
202 val |= UART_MCR_DTR;
203
204 if (set & TIOCM_RTS)
205 val |= UART_MCR_RTS;
206
207 dev_dbg(&port->dev, "%s new:%02x old:%02x\n", __func__,
208 val, priv->modem_control);
209
210 status = f81232_set_register(port, MODEM_CONTROL_REGISTER, val);
211 if (status) {
212 dev_err(&port->dev, "%s set MCR status < 0\n", __func__);
213 mutex_unlock(&priv->lock);
214 return status;
215 }
216
217 priv->modem_control = val;
218 mutex_unlock(&priv->lock);
219
220 return 0;
221}
222
223static void f81232_update_line_status(struct usb_serial_port *port,
224 unsigned char *data,
225 size_t actual_length)
226{
227 struct f81232_private *priv = usb_get_serial_port_data(port);
228
229 if (!actual_length)
230 return;
231
232 switch (data[0] & 0x07) {
233 case 0x00: /* msr change */
234 dev_dbg(&port->dev, "IIR: MSR Change: %02x\n", data[0]);
235 schedule_work(&priv->interrupt_work);
236 break;
237 case 0x02: /* tx-empty */
238 break;
239 case 0x04: /* rx data available */
240 break;
241 case 0x06: /* lsr change */
242 /* we can forget it. the LSR will read from bulk-in */
243 dev_dbg(&port->dev, "IIR: LSR Change: %02x\n", data[0]);
244 break;
245 }
246}
247
248static void f81232_read_int_callback(struct urb *urb)
249{
250 struct usb_serial_port *port = urb->context;
251 unsigned char *data = urb->transfer_buffer;
252 unsigned int actual_length = urb->actual_length;
253 int status = urb->status;
254 int retval;
255
256 switch (status) {
257 case 0:
258 /* success */
259 break;
260 case -ECONNRESET:
261 case -ENOENT:
262 case -ESHUTDOWN:
263 /* this urb is terminated, clean up */
264 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
265 __func__, status);
266 return;
267 default:
268 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
269 __func__, status);
270 goto exit;
271 }
272
273 usb_serial_debug_data(&port->dev, __func__,
274 urb->actual_length, urb->transfer_buffer);
275
276 f81232_update_line_status(port, data, actual_length);
277
278exit:
279 retval = usb_submit_urb(urb, GFP_ATOMIC);
280 if (retval)
281 dev_err(&urb->dev->dev,
282 "%s - usb_submit_urb failed with result %d\n",
283 __func__, retval);
284}
285
286static void f81232_process_read_urb(struct urb *urb)
287{
288 struct usb_serial_port *port = urb->context;
289 unsigned char *data = urb->transfer_buffer;
290 char tty_flag;
291 unsigned int i;
292 u8 lsr;
293
294 /*
295 * When opening the port we get a 1-byte packet with the current LSR,
296 * which we discard.
297 */
298 if ((urb->actual_length < 2) || (urb->actual_length % 2))
299 return;
300
301 /* bulk-in data: [LSR(1Byte)+DATA(1Byte)][LSR(1Byte)+DATA(1Byte)]... */
302
303 for (i = 0; i < urb->actual_length; i += 2) {
304 tty_flag = TTY_NORMAL;
305 lsr = data[i];
306
307 if (lsr & UART_LSR_BRK_ERROR_BITS) {
308 if (lsr & UART_LSR_BI) {
309 tty_flag = TTY_BREAK;
310 port->icount.brk++;
311 usb_serial_handle_break(port);
312 } else if (lsr & UART_LSR_PE) {
313 tty_flag = TTY_PARITY;
314 port->icount.parity++;
315 } else if (lsr & UART_LSR_FE) {
316 tty_flag = TTY_FRAME;
317 port->icount.frame++;
318 }
319
320 if (lsr & UART_LSR_OE) {
321 port->icount.overrun++;
322 tty_insert_flip_char(&port->port, 0,
323 TTY_OVERRUN);
324 }
325 }
326
327 if (port->port.console && port->sysrq) {
328 if (usb_serial_handle_sysrq_char(port, data[i + 1]))
329 continue;
330 }
331
332 tty_insert_flip_char(&port->port, data[i + 1], tty_flag);
333 }
334
335 tty_flip_buffer_push(&port->port);
336}
337
338static void f81232_break_ctl(struct tty_struct *tty, int break_state)
339{
340 /* FIXME - Stubbed out for now */
341
342 /*
343 * break_state = -1 to turn on break, and 0 to turn off break
344 * see drivers/char/tty_io.c to see it used.
345 * last_set_data_urb_value NEVER has the break bit set in it.
346 */
347}
348
349static void f81232_set_baudrate(struct usb_serial_port *port, speed_t baudrate)
350{
351 u8 lcr;
352 int divisor;
353 int status = 0;
354
355 divisor = calc_baud_divisor(baudrate);
356
357 status = f81232_get_register(port, LINE_CONTROL_REGISTER,
358 &lcr); /* get LCR */
359 if (status) {
360 dev_err(&port->dev, "%s failed to get LCR: %d\n",
361 __func__, status);
362 return;
363 }
364
365 status = f81232_set_register(port, LINE_CONTROL_REGISTER,
366 lcr | UART_LCR_DLAB); /* Enable DLAB */
367 if (status) {
368 dev_err(&port->dev, "%s failed to set DLAB: %d\n",
369 __func__, status);
370 return;
371 }
372
373 status = f81232_set_register(port, RECEIVE_BUFFER_REGISTER,
374 divisor & 0x00ff); /* low */
375 if (status) {
376 dev_err(&port->dev, "%s failed to set baudrate MSB: %d\n",
377 __func__, status);
378 goto reapply_lcr;
379 }
380
381 status = f81232_set_register(port, INTERRUPT_ENABLE_REGISTER,
382 (divisor & 0xff00) >> 8); /* high */
383 if (status) {
384 dev_err(&port->dev, "%s failed to set baudrate LSB: %d\n",
385 __func__, status);
386 }
387
388reapply_lcr:
389 status = f81232_set_register(port, LINE_CONTROL_REGISTER,
390 lcr & ~UART_LCR_DLAB);
391 if (status) {
392 dev_err(&port->dev, "%s failed to set DLAB: %d\n",
393 __func__, status);
394 }
395}
396
397static int f81232_port_enable(struct usb_serial_port *port)
398{
399 u8 val;
400 int status;
401
402 /* fifo on, trigger8, clear TX/RX*/
403 val = UART_FCR_TRIGGER_8 | UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR |
404 UART_FCR_CLEAR_XMIT;
405
406 status = f81232_set_register(port, FIFO_CONTROL_REGISTER, val);
407 if (status) {
408 dev_err(&port->dev, "%s failed to set FCR: %d\n",
409 __func__, status);
410 return status;
411 }
412
413 /* MSR Interrupt only, LSR will read from Bulk-in odd byte */
414 status = f81232_set_register(port, INTERRUPT_ENABLE_REGISTER,
415 UART_IER_MSI);
416 if (status) {
417 dev_err(&port->dev, "%s failed to set IER: %d\n",
418 __func__, status);
419 return status;
420 }
421
422 return 0;
423}
424
425static int f81232_port_disable(struct usb_serial_port *port)
426{
427 int status;
428
429 status = f81232_set_register(port, INTERRUPT_ENABLE_REGISTER, 0);
430 if (status) {
431 dev_err(&port->dev, "%s failed to set IER: %d\n",
432 __func__, status);
433 return status;
434 }
435
436 return 0;
437}
438
439static void f81232_set_termios(struct tty_struct *tty,
440 struct usb_serial_port *port, struct ktermios *old_termios)
441{
442 u8 new_lcr = 0;
443 int status = 0;
444 speed_t baudrate;
445
446 /* Don't change anything if nothing has changed */
447 if (old_termios && !tty_termios_hw_change(&tty->termios, old_termios))
448 return;
449
450 if (C_BAUD(tty) == B0)
451 f81232_set_mctrl(port, 0, TIOCM_DTR | TIOCM_RTS);
452 else if (old_termios && (old_termios->c_cflag & CBAUD) == B0)
453 f81232_set_mctrl(port, TIOCM_DTR | TIOCM_RTS, 0);
454
455 baudrate = tty_get_baud_rate(tty);
456 if (baudrate > 0) {
457 if (baudrate > F81232_MAX_BAUDRATE) {
458 baudrate = F81232_MAX_BAUDRATE;
459 tty_encode_baud_rate(tty, baudrate, baudrate);
460 }
461 f81232_set_baudrate(port, baudrate);
462 }
463
464 if (C_PARENB(tty)) {
465 new_lcr |= UART_LCR_PARITY;
466
467 if (!C_PARODD(tty))
468 new_lcr |= UART_LCR_EPAR;
469
470 if (C_CMSPAR(tty))
471 new_lcr |= UART_LCR_SPAR;
472 }
473
474 if (C_CSTOPB(tty))
475 new_lcr |= UART_LCR_STOP;
476
477 switch (C_CSIZE(tty)) {
478 case CS5:
479 new_lcr |= UART_LCR_WLEN5;
480 break;
481 case CS6:
482 new_lcr |= UART_LCR_WLEN6;
483 break;
484 case CS7:
485 new_lcr |= UART_LCR_WLEN7;
486 break;
487 default:
488 case CS8:
489 new_lcr |= UART_LCR_WLEN8;
490 break;
491 }
492
493 status = f81232_set_register(port, LINE_CONTROL_REGISTER, new_lcr);
494 if (status) {
495 dev_err(&port->dev, "%s failed to set LCR: %d\n",
496 __func__, status);
497 }
498}
499
500static int f81232_tiocmget(struct tty_struct *tty)
501{
502 int r;
503 struct usb_serial_port *port = tty->driver_data;
504 struct f81232_private *port_priv = usb_get_serial_port_data(port);
505 u8 mcr, msr;
506
507 /* force get current MSR changed state */
508 f81232_read_msr(port);
509
510 mutex_lock(&port_priv->lock);
511 mcr = port_priv->modem_control;
512 msr = port_priv->modem_status;
513 mutex_unlock(&port_priv->lock);
514
515 r = (mcr & UART_MCR_DTR ? TIOCM_DTR : 0) |
516 (mcr & UART_MCR_RTS ? TIOCM_RTS : 0) |
517 (msr & UART_MSR_CTS ? TIOCM_CTS : 0) |
518 (msr & UART_MSR_DCD ? TIOCM_CAR : 0) |
519 (msr & UART_MSR_RI ? TIOCM_RI : 0) |
520 (msr & UART_MSR_DSR ? TIOCM_DSR : 0);
521
522 return r;
523}
524
525static int f81232_tiocmset(struct tty_struct *tty,
526 unsigned int set, unsigned int clear)
527{
528 struct usb_serial_port *port = tty->driver_data;
529
530 return f81232_set_mctrl(port, set, clear);
531}
532
533static int f81232_open(struct tty_struct *tty, struct usb_serial_port *port)
534{
535 int result;
536
537 result = f81232_port_enable(port);
538 if (result)
539 return result;
540
541 /* Setup termios */
542 if (tty)
543 f81232_set_termios(tty, port, NULL);
544
545 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
546 if (result) {
547 dev_err(&port->dev, "%s - failed submitting interrupt urb,"
548 " error %d\n", __func__, result);
549 return result;
550 }
551
552 result = usb_serial_generic_open(tty, port);
553 if (result) {
554 usb_kill_urb(port->interrupt_in_urb);
555 return result;
556 }
557
558 return 0;
559}
560
561static void f81232_close(struct usb_serial_port *port)
562{
563 f81232_port_disable(port);
564 usb_serial_generic_close(port);
565 usb_kill_urb(port->interrupt_in_urb);
566}
567
568static void f81232_dtr_rts(struct usb_serial_port *port, int on)
569{
570 if (on)
571 f81232_set_mctrl(port, TIOCM_DTR | TIOCM_RTS, 0);
572 else
573 f81232_set_mctrl(port, 0, TIOCM_DTR | TIOCM_RTS);
574}
575
576static int f81232_carrier_raised(struct usb_serial_port *port)
577{
578 u8 msr;
579 struct f81232_private *priv = usb_get_serial_port_data(port);
580
581 mutex_lock(&priv->lock);
582 msr = priv->modem_status;
583 mutex_unlock(&priv->lock);
584
585 if (msr & UART_MSR_DCD)
586 return 1;
587 return 0;
588}
589
590static int f81232_get_serial_info(struct usb_serial_port *port,
591 unsigned long arg)
592{
593 struct serial_struct ser;
594
595 memset(&ser, 0, sizeof(ser));
596
597 ser.type = PORT_16550A;
598 ser.line = port->minor;
599 ser.port = port->port_number;
600 ser.baud_base = F81232_MAX_BAUDRATE;
601
602 if (copy_to_user((void __user *)arg, &ser, sizeof(ser)))
603 return -EFAULT;
604
605 return 0;
606}
607
608static int f81232_ioctl(struct tty_struct *tty,
609 unsigned int cmd, unsigned long arg)
610{
611 struct usb_serial_port *port = tty->driver_data;
612
613 switch (cmd) {
614 case TIOCGSERIAL:
615 return f81232_get_serial_info(port, arg);
616 default:
617 break;
618 }
619 return -ENOIOCTLCMD;
620}
621
622static void f81232_interrupt_work(struct work_struct *work)
623{
624 struct f81232_private *priv =
625 container_of(work, struct f81232_private, interrupt_work);
626
627 f81232_read_msr(priv->port);
628}
629
630static int f81232_port_probe(struct usb_serial_port *port)
631{
632 struct f81232_private *priv;
633
634 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
635 if (!priv)
636 return -ENOMEM;
637
638 mutex_init(&priv->lock);
639 INIT_WORK(&priv->interrupt_work, f81232_interrupt_work);
640
641 usb_set_serial_port_data(port, priv);
642
643 port->port.drain_delay = 256;
644 priv->port = port;
645
646 return 0;
647}
648
649static int f81232_port_remove(struct usb_serial_port *port)
650{
651 struct f81232_private *priv;
652
653 priv = usb_get_serial_port_data(port);
654 kfree(priv);
655
656 return 0;
657}
658
659static struct usb_serial_driver f81232_device = {
660 .driver = {
661 .owner = THIS_MODULE,
662 .name = "f81232",
663 },
664 .id_table = id_table,
665 .num_ports = 1,
666 .bulk_in_size = 256,
667 .bulk_out_size = 256,
668 .open = f81232_open,
669 .close = f81232_close,
670 .dtr_rts = f81232_dtr_rts,
671 .carrier_raised = f81232_carrier_raised,
672 .ioctl = f81232_ioctl,
673 .break_ctl = f81232_break_ctl,
674 .set_termios = f81232_set_termios,
675 .tiocmget = f81232_tiocmget,
676 .tiocmset = f81232_tiocmset,
677 .tiocmiwait = usb_serial_generic_tiocmiwait,
678 .process_read_urb = f81232_process_read_urb,
679 .read_int_callback = f81232_read_int_callback,
680 .port_probe = f81232_port_probe,
681 .port_remove = f81232_port_remove,
682};
683
684static struct usb_serial_driver * const serial_drivers[] = {
685 &f81232_device,
686 NULL,
687};
688
689module_usb_serial_driver(serial_drivers, id_table);
690
691MODULE_DESCRIPTION("Fintek F81232 USB to serial adaptor driver");
692MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@linuxfoundation.org>");
693MODULE_AUTHOR("Peter Hong <peter_hong@fintek.com.tw>");
694MODULE_LICENSE("GPL v2");
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Fintek F81232 USB to serial adaptor driver
4 *
5 * Copyright (C) 2012 Greg Kroah-Hartman (gregkh@linuxfoundation.org)
6 * Copyright (C) 2012 Linux Foundation
7 */
8
9#include <linux/kernel.h>
10#include <linux/errno.h>
11#include <linux/slab.h>
12#include <linux/tty.h>
13#include <linux/tty_driver.h>
14#include <linux/tty_flip.h>
15#include <linux/serial.h>
16#include <linux/module.h>
17#include <linux/moduleparam.h>
18#include <linux/mutex.h>
19#include <linux/uaccess.h>
20#include <linux/usb.h>
21#include <linux/usb/serial.h>
22#include <linux/serial_reg.h>
23
24static const struct usb_device_id id_table[] = {
25 { USB_DEVICE(0x1934, 0x0706) },
26 { } /* Terminating entry */
27};
28MODULE_DEVICE_TABLE(usb, id_table);
29
30/* Maximum baudrate for F81232 */
31#define F81232_MAX_BAUDRATE 1500000
32#define F81232_DEF_BAUDRATE 9600
33
34/* USB Control EP parameter */
35#define F81232_REGISTER_REQUEST 0xa0
36#define F81232_GET_REGISTER 0xc0
37#define F81232_SET_REGISTER 0x40
38
39#define SERIAL_BASE_ADDRESS 0x0120
40#define RECEIVE_BUFFER_REGISTER (0x00 + SERIAL_BASE_ADDRESS)
41#define INTERRUPT_ENABLE_REGISTER (0x01 + SERIAL_BASE_ADDRESS)
42#define FIFO_CONTROL_REGISTER (0x02 + SERIAL_BASE_ADDRESS)
43#define LINE_CONTROL_REGISTER (0x03 + SERIAL_BASE_ADDRESS)
44#define MODEM_CONTROL_REGISTER (0x04 + SERIAL_BASE_ADDRESS)
45#define LINE_STATUS_REGISTER (0x05 + SERIAL_BASE_ADDRESS)
46#define MODEM_STATUS_REGISTER (0x06 + SERIAL_BASE_ADDRESS)
47
48/*
49 * F81232 Clock registers (106h)
50 *
51 * Bit1-0: Clock source selector
52 * 00: 1.846MHz.
53 * 01: 18.46MHz.
54 * 10: 24MHz.
55 * 11: 14.77MHz.
56 */
57#define F81232_CLK_REGISTER 0x106
58#define F81232_CLK_1_846_MHZ 0
59#define F81232_CLK_18_46_MHZ BIT(0)
60#define F81232_CLK_24_MHZ BIT(1)
61#define F81232_CLK_14_77_MHZ (BIT(1) | BIT(0))
62#define F81232_CLK_MASK GENMASK(1, 0)
63
64struct f81232_private {
65 struct mutex lock;
66 u8 modem_control;
67 u8 modem_status;
68 u8 shadow_lcr;
69 speed_t baud_base;
70 struct work_struct lsr_work;
71 struct work_struct interrupt_work;
72 struct usb_serial_port *port;
73};
74
75static u32 const baudrate_table[] = { 115200, 921600, 1152000, 1500000 };
76static u8 const clock_table[] = { F81232_CLK_1_846_MHZ, F81232_CLK_14_77_MHZ,
77 F81232_CLK_18_46_MHZ, F81232_CLK_24_MHZ };
78
79static int calc_baud_divisor(speed_t baudrate, speed_t clockrate)
80{
81 if (!baudrate)
82 return 0;
83
84 return DIV_ROUND_CLOSEST(clockrate, baudrate);
85}
86
87static int f81232_get_register(struct usb_serial_port *port, u16 reg, u8 *val)
88{
89 int status;
90 u8 *tmp;
91 struct usb_device *dev = port->serial->dev;
92
93 tmp = kmalloc(sizeof(*val), GFP_KERNEL);
94 if (!tmp)
95 return -ENOMEM;
96
97 status = usb_control_msg(dev,
98 usb_rcvctrlpipe(dev, 0),
99 F81232_REGISTER_REQUEST,
100 F81232_GET_REGISTER,
101 reg,
102 0,
103 tmp,
104 sizeof(*val),
105 USB_CTRL_GET_TIMEOUT);
106 if (status != sizeof(*val)) {
107 dev_err(&port->dev, "%s failed status: %d\n", __func__, status);
108
109 if (status < 0)
110 status = usb_translate_errors(status);
111 else
112 status = -EIO;
113 } else {
114 status = 0;
115 *val = *tmp;
116 }
117
118 kfree(tmp);
119 return status;
120}
121
122static int f81232_set_register(struct usb_serial_port *port, u16 reg, u8 val)
123{
124 int status;
125 u8 *tmp;
126 struct usb_device *dev = port->serial->dev;
127
128 tmp = kmalloc(sizeof(val), GFP_KERNEL);
129 if (!tmp)
130 return -ENOMEM;
131
132 *tmp = val;
133
134 status = usb_control_msg(dev,
135 usb_sndctrlpipe(dev, 0),
136 F81232_REGISTER_REQUEST,
137 F81232_SET_REGISTER,
138 reg,
139 0,
140 tmp,
141 sizeof(val),
142 USB_CTRL_SET_TIMEOUT);
143 if (status != sizeof(val)) {
144 dev_err(&port->dev, "%s failed status: %d\n", __func__, status);
145
146 if (status < 0)
147 status = usb_translate_errors(status);
148 else
149 status = -EIO;
150 } else {
151 status = 0;
152 }
153
154 kfree(tmp);
155 return status;
156}
157
158static int f81232_set_mask_register(struct usb_serial_port *port, u16 reg,
159 u8 mask, u8 val)
160{
161 int status;
162 u8 tmp;
163
164 status = f81232_get_register(port, reg, &tmp);
165 if (status)
166 return status;
167
168 tmp = (tmp & ~mask) | (val & mask);
169
170 return f81232_set_register(port, reg, tmp);
171}
172
173static void f81232_read_msr(struct usb_serial_port *port)
174{
175 int status;
176 u8 current_msr;
177 struct tty_struct *tty;
178 struct f81232_private *priv = usb_get_serial_port_data(port);
179
180 mutex_lock(&priv->lock);
181 status = f81232_get_register(port, MODEM_STATUS_REGISTER,
182 ¤t_msr);
183 if (status) {
184 dev_err(&port->dev, "%s fail, status: %d\n", __func__, status);
185 mutex_unlock(&priv->lock);
186 return;
187 }
188
189 if (!(current_msr & UART_MSR_ANY_DELTA)) {
190 mutex_unlock(&priv->lock);
191 return;
192 }
193
194 priv->modem_status = current_msr;
195
196 if (current_msr & UART_MSR_DCTS)
197 port->icount.cts++;
198 if (current_msr & UART_MSR_DDSR)
199 port->icount.dsr++;
200 if (current_msr & UART_MSR_TERI)
201 port->icount.rng++;
202 if (current_msr & UART_MSR_DDCD) {
203 port->icount.dcd++;
204 tty = tty_port_tty_get(&port->port);
205 if (tty) {
206 usb_serial_handle_dcd_change(port, tty,
207 current_msr & UART_MSR_DCD);
208
209 tty_kref_put(tty);
210 }
211 }
212
213 wake_up_interruptible(&port->port.delta_msr_wait);
214 mutex_unlock(&priv->lock);
215}
216
217static int f81232_set_mctrl(struct usb_serial_port *port,
218 unsigned int set, unsigned int clear)
219{
220 u8 val;
221 int status;
222 struct f81232_private *priv = usb_get_serial_port_data(port);
223
224 if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0)
225 return 0; /* no change */
226
227 /* 'set' takes precedence over 'clear' */
228 clear &= ~set;
229
230 /* force enable interrupt with OUT2 */
231 mutex_lock(&priv->lock);
232 val = UART_MCR_OUT2 | priv->modem_control;
233
234 if (clear & TIOCM_DTR)
235 val &= ~UART_MCR_DTR;
236
237 if (clear & TIOCM_RTS)
238 val &= ~UART_MCR_RTS;
239
240 if (set & TIOCM_DTR)
241 val |= UART_MCR_DTR;
242
243 if (set & TIOCM_RTS)
244 val |= UART_MCR_RTS;
245
246 dev_dbg(&port->dev, "%s new:%02x old:%02x\n", __func__,
247 val, priv->modem_control);
248
249 status = f81232_set_register(port, MODEM_CONTROL_REGISTER, val);
250 if (status) {
251 dev_err(&port->dev, "%s set MCR status < 0\n", __func__);
252 mutex_unlock(&priv->lock);
253 return status;
254 }
255
256 priv->modem_control = val;
257 mutex_unlock(&priv->lock);
258
259 return 0;
260}
261
262static void f81232_update_line_status(struct usb_serial_port *port,
263 unsigned char *data,
264 size_t actual_length)
265{
266 struct f81232_private *priv = usb_get_serial_port_data(port);
267
268 if (!actual_length)
269 return;
270
271 switch (data[0] & 0x07) {
272 case 0x00: /* msr change */
273 dev_dbg(&port->dev, "IIR: MSR Change: %02x\n", data[0]);
274 schedule_work(&priv->interrupt_work);
275 break;
276 case 0x02: /* tx-empty */
277 break;
278 case 0x04: /* rx data available */
279 break;
280 case 0x06: /* lsr change */
281 /* we can forget it. the LSR will read from bulk-in */
282 dev_dbg(&port->dev, "IIR: LSR Change: %02x\n", data[0]);
283 break;
284 }
285}
286
287static void f81232_read_int_callback(struct urb *urb)
288{
289 struct usb_serial_port *port = urb->context;
290 unsigned char *data = urb->transfer_buffer;
291 unsigned int actual_length = urb->actual_length;
292 int status = urb->status;
293 int retval;
294
295 switch (status) {
296 case 0:
297 /* success */
298 break;
299 case -ECONNRESET:
300 case -ENOENT:
301 case -ESHUTDOWN:
302 /* this urb is terminated, clean up */
303 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
304 __func__, status);
305 return;
306 default:
307 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
308 __func__, status);
309 goto exit;
310 }
311
312 usb_serial_debug_data(&port->dev, __func__,
313 urb->actual_length, urb->transfer_buffer);
314
315 f81232_update_line_status(port, data, actual_length);
316
317exit:
318 retval = usb_submit_urb(urb, GFP_ATOMIC);
319 if (retval)
320 dev_err(&urb->dev->dev,
321 "%s - usb_submit_urb failed with result %d\n",
322 __func__, retval);
323}
324
325static void f81232_process_read_urb(struct urb *urb)
326{
327 struct usb_serial_port *port = urb->context;
328 struct f81232_private *priv = usb_get_serial_port_data(port);
329 unsigned char *data = urb->transfer_buffer;
330 char tty_flag;
331 unsigned int i;
332 u8 lsr;
333
334 /*
335 * When opening the port we get a 1-byte packet with the current LSR,
336 * which we discard.
337 */
338 if ((urb->actual_length < 2) || (urb->actual_length % 2))
339 return;
340
341 /* bulk-in data: [LSR(1Byte)+DATA(1Byte)][LSR(1Byte)+DATA(1Byte)]... */
342
343 for (i = 0; i < urb->actual_length; i += 2) {
344 tty_flag = TTY_NORMAL;
345 lsr = data[i];
346
347 if (lsr & UART_LSR_BRK_ERROR_BITS) {
348 if (lsr & UART_LSR_BI) {
349 tty_flag = TTY_BREAK;
350 port->icount.brk++;
351 usb_serial_handle_break(port);
352 } else if (lsr & UART_LSR_PE) {
353 tty_flag = TTY_PARITY;
354 port->icount.parity++;
355 } else if (lsr & UART_LSR_FE) {
356 tty_flag = TTY_FRAME;
357 port->icount.frame++;
358 }
359
360 if (lsr & UART_LSR_OE) {
361 port->icount.overrun++;
362 schedule_work(&priv->lsr_work);
363 tty_insert_flip_char(&port->port, 0,
364 TTY_OVERRUN);
365 }
366 }
367
368 if (port->port.console && port->sysrq) {
369 if (usb_serial_handle_sysrq_char(port, data[i + 1]))
370 continue;
371 }
372
373 tty_insert_flip_char(&port->port, data[i + 1], tty_flag);
374 }
375
376 tty_flip_buffer_push(&port->port);
377}
378
379static void f81232_break_ctl(struct tty_struct *tty, int break_state)
380{
381 struct usb_serial_port *port = tty->driver_data;
382 struct f81232_private *priv = usb_get_serial_port_data(port);
383 int status;
384
385 mutex_lock(&priv->lock);
386
387 if (break_state)
388 priv->shadow_lcr |= UART_LCR_SBC;
389 else
390 priv->shadow_lcr &= ~UART_LCR_SBC;
391
392 status = f81232_set_register(port, LINE_CONTROL_REGISTER,
393 priv->shadow_lcr);
394 if (status)
395 dev_err(&port->dev, "set break failed: %d\n", status);
396
397 mutex_unlock(&priv->lock);
398}
399
400static int f81232_find_clk(speed_t baudrate)
401{
402 int idx;
403
404 for (idx = 0; idx < ARRAY_SIZE(baudrate_table); ++idx) {
405 if (baudrate <= baudrate_table[idx] &&
406 baudrate_table[idx] % baudrate == 0)
407 return idx;
408 }
409
410 return -EINVAL;
411}
412
413static void f81232_set_baudrate(struct tty_struct *tty,
414 struct usb_serial_port *port, speed_t baudrate,
415 speed_t old_baudrate)
416{
417 struct f81232_private *priv = usb_get_serial_port_data(port);
418 u8 lcr;
419 int divisor;
420 int status = 0;
421 int i;
422 int idx;
423 speed_t baud_list[] = { baudrate, old_baudrate, F81232_DEF_BAUDRATE };
424
425 for (i = 0; i < ARRAY_SIZE(baud_list); ++i) {
426 idx = f81232_find_clk(baud_list[i]);
427 if (idx >= 0) {
428 baudrate = baud_list[i];
429 tty_encode_baud_rate(tty, baudrate, baudrate);
430 break;
431 }
432 }
433
434 if (idx < 0)
435 return;
436
437 priv->baud_base = baudrate_table[idx];
438 divisor = calc_baud_divisor(baudrate, priv->baud_base);
439
440 status = f81232_set_mask_register(port, F81232_CLK_REGISTER,
441 F81232_CLK_MASK, clock_table[idx]);
442 if (status) {
443 dev_err(&port->dev, "%s failed to set CLK_REG: %d\n",
444 __func__, status);
445 return;
446 }
447
448 status = f81232_get_register(port, LINE_CONTROL_REGISTER,
449 &lcr); /* get LCR */
450 if (status) {
451 dev_err(&port->dev, "%s failed to get LCR: %d\n",
452 __func__, status);
453 return;
454 }
455
456 status = f81232_set_register(port, LINE_CONTROL_REGISTER,
457 lcr | UART_LCR_DLAB); /* Enable DLAB */
458 if (status) {
459 dev_err(&port->dev, "%s failed to set DLAB: %d\n",
460 __func__, status);
461 return;
462 }
463
464 status = f81232_set_register(port, RECEIVE_BUFFER_REGISTER,
465 divisor & 0x00ff); /* low */
466 if (status) {
467 dev_err(&port->dev, "%s failed to set baudrate MSB: %d\n",
468 __func__, status);
469 goto reapply_lcr;
470 }
471
472 status = f81232_set_register(port, INTERRUPT_ENABLE_REGISTER,
473 (divisor & 0xff00) >> 8); /* high */
474 if (status) {
475 dev_err(&port->dev, "%s failed to set baudrate LSB: %d\n",
476 __func__, status);
477 }
478
479reapply_lcr:
480 status = f81232_set_register(port, LINE_CONTROL_REGISTER,
481 lcr & ~UART_LCR_DLAB);
482 if (status) {
483 dev_err(&port->dev, "%s failed to set DLAB: %d\n",
484 __func__, status);
485 }
486}
487
488static int f81232_port_enable(struct usb_serial_port *port)
489{
490 u8 val;
491 int status;
492
493 /* fifo on, trigger8, clear TX/RX*/
494 val = UART_FCR_TRIGGER_8 | UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR |
495 UART_FCR_CLEAR_XMIT;
496
497 status = f81232_set_register(port, FIFO_CONTROL_REGISTER, val);
498 if (status) {
499 dev_err(&port->dev, "%s failed to set FCR: %d\n",
500 __func__, status);
501 return status;
502 }
503
504 /* MSR Interrupt only, LSR will read from Bulk-in odd byte */
505 status = f81232_set_register(port, INTERRUPT_ENABLE_REGISTER,
506 UART_IER_MSI);
507 if (status) {
508 dev_err(&port->dev, "%s failed to set IER: %d\n",
509 __func__, status);
510 return status;
511 }
512
513 return 0;
514}
515
516static int f81232_port_disable(struct usb_serial_port *port)
517{
518 int status;
519
520 status = f81232_set_register(port, INTERRUPT_ENABLE_REGISTER, 0);
521 if (status) {
522 dev_err(&port->dev, "%s failed to set IER: %d\n",
523 __func__, status);
524 return status;
525 }
526
527 return 0;
528}
529
530static void f81232_set_termios(struct tty_struct *tty,
531 struct usb_serial_port *port, struct ktermios *old_termios)
532{
533 struct f81232_private *priv = usb_get_serial_port_data(port);
534 u8 new_lcr = 0;
535 int status = 0;
536 speed_t baudrate;
537 speed_t old_baud;
538
539 /* Don't change anything if nothing has changed */
540 if (old_termios && !tty_termios_hw_change(&tty->termios, old_termios))
541 return;
542
543 if (C_BAUD(tty) == B0)
544 f81232_set_mctrl(port, 0, TIOCM_DTR | TIOCM_RTS);
545 else if (old_termios && (old_termios->c_cflag & CBAUD) == B0)
546 f81232_set_mctrl(port, TIOCM_DTR | TIOCM_RTS, 0);
547
548 baudrate = tty_get_baud_rate(tty);
549 if (baudrate > 0) {
550 if (old_termios)
551 old_baud = tty_termios_baud_rate(old_termios);
552 else
553 old_baud = F81232_DEF_BAUDRATE;
554
555 f81232_set_baudrate(tty, port, baudrate, old_baud);
556 }
557
558 if (C_PARENB(tty)) {
559 new_lcr |= UART_LCR_PARITY;
560
561 if (!C_PARODD(tty))
562 new_lcr |= UART_LCR_EPAR;
563
564 if (C_CMSPAR(tty))
565 new_lcr |= UART_LCR_SPAR;
566 }
567
568 if (C_CSTOPB(tty))
569 new_lcr |= UART_LCR_STOP;
570
571 switch (C_CSIZE(tty)) {
572 case CS5:
573 new_lcr |= UART_LCR_WLEN5;
574 break;
575 case CS6:
576 new_lcr |= UART_LCR_WLEN6;
577 break;
578 case CS7:
579 new_lcr |= UART_LCR_WLEN7;
580 break;
581 default:
582 case CS8:
583 new_lcr |= UART_LCR_WLEN8;
584 break;
585 }
586
587 mutex_lock(&priv->lock);
588
589 new_lcr |= (priv->shadow_lcr & UART_LCR_SBC);
590 status = f81232_set_register(port, LINE_CONTROL_REGISTER, new_lcr);
591 if (status) {
592 dev_err(&port->dev, "%s failed to set LCR: %d\n",
593 __func__, status);
594 }
595
596 priv->shadow_lcr = new_lcr;
597
598 mutex_unlock(&priv->lock);
599}
600
601static int f81232_tiocmget(struct tty_struct *tty)
602{
603 int r;
604 struct usb_serial_port *port = tty->driver_data;
605 struct f81232_private *port_priv = usb_get_serial_port_data(port);
606 u8 mcr, msr;
607
608 /* force get current MSR changed state */
609 f81232_read_msr(port);
610
611 mutex_lock(&port_priv->lock);
612 mcr = port_priv->modem_control;
613 msr = port_priv->modem_status;
614 mutex_unlock(&port_priv->lock);
615
616 r = (mcr & UART_MCR_DTR ? TIOCM_DTR : 0) |
617 (mcr & UART_MCR_RTS ? TIOCM_RTS : 0) |
618 (msr & UART_MSR_CTS ? TIOCM_CTS : 0) |
619 (msr & UART_MSR_DCD ? TIOCM_CAR : 0) |
620 (msr & UART_MSR_RI ? TIOCM_RI : 0) |
621 (msr & UART_MSR_DSR ? TIOCM_DSR : 0);
622
623 return r;
624}
625
626static int f81232_tiocmset(struct tty_struct *tty,
627 unsigned int set, unsigned int clear)
628{
629 struct usb_serial_port *port = tty->driver_data;
630
631 return f81232_set_mctrl(port, set, clear);
632}
633
634static int f81232_open(struct tty_struct *tty, struct usb_serial_port *port)
635{
636 int result;
637
638 result = f81232_port_enable(port);
639 if (result)
640 return result;
641
642 /* Setup termios */
643 if (tty)
644 f81232_set_termios(tty, port, NULL);
645
646 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
647 if (result) {
648 dev_err(&port->dev, "%s - failed submitting interrupt urb,"
649 " error %d\n", __func__, result);
650 return result;
651 }
652
653 result = usb_serial_generic_open(tty, port);
654 if (result) {
655 usb_kill_urb(port->interrupt_in_urb);
656 return result;
657 }
658
659 return 0;
660}
661
662static void f81232_close(struct usb_serial_port *port)
663{
664 struct f81232_private *port_priv = usb_get_serial_port_data(port);
665
666 f81232_port_disable(port);
667 usb_serial_generic_close(port);
668 usb_kill_urb(port->interrupt_in_urb);
669 flush_work(&port_priv->interrupt_work);
670 flush_work(&port_priv->lsr_work);
671}
672
673static void f81232_dtr_rts(struct usb_serial_port *port, int on)
674{
675 if (on)
676 f81232_set_mctrl(port, TIOCM_DTR | TIOCM_RTS, 0);
677 else
678 f81232_set_mctrl(port, 0, TIOCM_DTR | TIOCM_RTS);
679}
680
681static int f81232_carrier_raised(struct usb_serial_port *port)
682{
683 u8 msr;
684 struct f81232_private *priv = usb_get_serial_port_data(port);
685
686 mutex_lock(&priv->lock);
687 msr = priv->modem_status;
688 mutex_unlock(&priv->lock);
689
690 if (msr & UART_MSR_DCD)
691 return 1;
692 return 0;
693}
694
695static int f81232_get_serial_info(struct tty_struct *tty,
696 struct serial_struct *ss)
697{
698 struct usb_serial_port *port = tty->driver_data;
699 struct f81232_private *priv = usb_get_serial_port_data(port);
700
701 ss->type = PORT_16550A;
702 ss->line = port->minor;
703 ss->port = port->port_number;
704 ss->baud_base = priv->baud_base;
705 return 0;
706}
707
708static void f81232_interrupt_work(struct work_struct *work)
709{
710 struct f81232_private *priv =
711 container_of(work, struct f81232_private, interrupt_work);
712
713 f81232_read_msr(priv->port);
714}
715
716static void f81232_lsr_worker(struct work_struct *work)
717{
718 struct f81232_private *priv;
719 struct usb_serial_port *port;
720 int status;
721 u8 tmp;
722
723 priv = container_of(work, struct f81232_private, lsr_work);
724 port = priv->port;
725
726 status = f81232_get_register(port, LINE_STATUS_REGISTER, &tmp);
727 if (status)
728 dev_warn(&port->dev, "read LSR failed: %d\n", status);
729}
730
731static int f81232_port_probe(struct usb_serial_port *port)
732{
733 struct f81232_private *priv;
734
735 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
736 if (!priv)
737 return -ENOMEM;
738
739 mutex_init(&priv->lock);
740 INIT_WORK(&priv->interrupt_work, f81232_interrupt_work);
741 INIT_WORK(&priv->lsr_work, f81232_lsr_worker);
742
743 usb_set_serial_port_data(port, priv);
744
745 port->port.drain_delay = 256;
746 priv->port = port;
747
748 return 0;
749}
750
751static int f81232_port_remove(struct usb_serial_port *port)
752{
753 struct f81232_private *priv;
754
755 priv = usb_get_serial_port_data(port);
756 kfree(priv);
757
758 return 0;
759}
760
761static int f81232_suspend(struct usb_serial *serial, pm_message_t message)
762{
763 struct usb_serial_port *port = serial->port[0];
764 struct f81232_private *port_priv = usb_get_serial_port_data(port);
765 int i;
766
767 for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i)
768 usb_kill_urb(port->read_urbs[i]);
769
770 usb_kill_urb(port->interrupt_in_urb);
771
772 if (port_priv) {
773 flush_work(&port_priv->interrupt_work);
774 flush_work(&port_priv->lsr_work);
775 }
776
777 return 0;
778}
779
780static int f81232_resume(struct usb_serial *serial)
781{
782 struct usb_serial_port *port = serial->port[0];
783 int result;
784
785 if (tty_port_initialized(&port->port)) {
786 result = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO);
787 if (result) {
788 dev_err(&port->dev, "submit interrupt urb failed: %d\n",
789 result);
790 return result;
791 }
792 }
793
794 return usb_serial_generic_resume(serial);
795}
796
797static struct usb_serial_driver f81232_device = {
798 .driver = {
799 .owner = THIS_MODULE,
800 .name = "f81232",
801 },
802 .id_table = id_table,
803 .num_ports = 1,
804 .bulk_in_size = 256,
805 .bulk_out_size = 256,
806 .open = f81232_open,
807 .close = f81232_close,
808 .dtr_rts = f81232_dtr_rts,
809 .carrier_raised = f81232_carrier_raised,
810 .get_serial = f81232_get_serial_info,
811 .break_ctl = f81232_break_ctl,
812 .set_termios = f81232_set_termios,
813 .tiocmget = f81232_tiocmget,
814 .tiocmset = f81232_tiocmset,
815 .tiocmiwait = usb_serial_generic_tiocmiwait,
816 .process_read_urb = f81232_process_read_urb,
817 .read_int_callback = f81232_read_int_callback,
818 .port_probe = f81232_port_probe,
819 .port_remove = f81232_port_remove,
820 .suspend = f81232_suspend,
821 .resume = f81232_resume,
822};
823
824static struct usb_serial_driver * const serial_drivers[] = {
825 &f81232_device,
826 NULL,
827};
828
829module_usb_serial_driver(serial_drivers, id_table);
830
831MODULE_DESCRIPTION("Fintek F81232 USB to serial adaptor driver");
832MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@linuxfoundation.org>");
833MODULE_AUTHOR("Peter Hong <peter_hong@fintek.com.tw>");
834MODULE_LICENSE("GPL v2");