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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 115200
32
33/* USB Control EP parameter */
34#define F81232_REGISTER_REQUEST 0xa0
35#define F81232_GET_REGISTER 0xc0
36#define F81232_SET_REGISTER 0x40
37
38#define SERIAL_BASE_ADDRESS 0x0120
39#define RECEIVE_BUFFER_REGISTER (0x00 + SERIAL_BASE_ADDRESS)
40#define INTERRUPT_ENABLE_REGISTER (0x01 + SERIAL_BASE_ADDRESS)
41#define FIFO_CONTROL_REGISTER (0x02 + SERIAL_BASE_ADDRESS)
42#define LINE_CONTROL_REGISTER (0x03 + SERIAL_BASE_ADDRESS)
43#define MODEM_CONTROL_REGISTER (0x04 + SERIAL_BASE_ADDRESS)
44#define MODEM_STATUS_REGISTER (0x06 + SERIAL_BASE_ADDRESS)
45
46struct f81232_private {
47 struct mutex lock;
48 u8 modem_control;
49 u8 modem_status;
50 struct work_struct interrupt_work;
51 struct usb_serial_port *port;
52};
53
54static int calc_baud_divisor(speed_t baudrate)
55{
56 return DIV_ROUND_CLOSEST(F81232_MAX_BAUDRATE, baudrate);
57}
58
59static int f81232_get_register(struct usb_serial_port *port, u16 reg, u8 *val)
60{
61 int status;
62 u8 *tmp;
63 struct usb_device *dev = port->serial->dev;
64
65 tmp = kmalloc(sizeof(*val), GFP_KERNEL);
66 if (!tmp)
67 return -ENOMEM;
68
69 status = usb_control_msg(dev,
70 usb_rcvctrlpipe(dev, 0),
71 F81232_REGISTER_REQUEST,
72 F81232_GET_REGISTER,
73 reg,
74 0,
75 tmp,
76 sizeof(*val),
77 USB_CTRL_GET_TIMEOUT);
78 if (status != sizeof(*val)) {
79 dev_err(&port->dev, "%s failed status: %d\n", __func__, status);
80
81 if (status < 0)
82 status = usb_translate_errors(status);
83 else
84 status = -EIO;
85 } else {
86 status = 0;
87 *val = *tmp;
88 }
89
90 kfree(tmp);
91 return status;
92}
93
94static int f81232_set_register(struct usb_serial_port *port, u16 reg, u8 val)
95{
96 int status;
97 u8 *tmp;
98 struct usb_device *dev = port->serial->dev;
99
100 tmp = kmalloc(sizeof(val), GFP_KERNEL);
101 if (!tmp)
102 return -ENOMEM;
103
104 *tmp = val;
105
106 status = usb_control_msg(dev,
107 usb_sndctrlpipe(dev, 0),
108 F81232_REGISTER_REQUEST,
109 F81232_SET_REGISTER,
110 reg,
111 0,
112 tmp,
113 sizeof(val),
114 USB_CTRL_SET_TIMEOUT);
115 if (status != sizeof(val)) {
116 dev_err(&port->dev, "%s failed status: %d\n", __func__, status);
117
118 if (status < 0)
119 status = usb_translate_errors(status);
120 else
121 status = -EIO;
122 } else {
123 status = 0;
124 }
125
126 kfree(tmp);
127 return status;
128}
129
130static void f81232_read_msr(struct usb_serial_port *port)
131{
132 int status;
133 u8 current_msr;
134 struct tty_struct *tty;
135 struct f81232_private *priv = usb_get_serial_port_data(port);
136
137 mutex_lock(&priv->lock);
138 status = f81232_get_register(port, MODEM_STATUS_REGISTER,
139 ¤t_msr);
140 if (status) {
141 dev_err(&port->dev, "%s fail, status: %d\n", __func__, status);
142 mutex_unlock(&priv->lock);
143 return;
144 }
145
146 if (!(current_msr & UART_MSR_ANY_DELTA)) {
147 mutex_unlock(&priv->lock);
148 return;
149 }
150
151 priv->modem_status = current_msr;
152
153 if (current_msr & UART_MSR_DCTS)
154 port->icount.cts++;
155 if (current_msr & UART_MSR_DDSR)
156 port->icount.dsr++;
157 if (current_msr & UART_MSR_TERI)
158 port->icount.rng++;
159 if (current_msr & UART_MSR_DDCD) {
160 port->icount.dcd++;
161 tty = tty_port_tty_get(&port->port);
162 if (tty) {
163 usb_serial_handle_dcd_change(port, tty,
164 current_msr & UART_MSR_DCD);
165
166 tty_kref_put(tty);
167 }
168 }
169
170 wake_up_interruptible(&port->port.delta_msr_wait);
171 mutex_unlock(&priv->lock);
172}
173
174static int f81232_set_mctrl(struct usb_serial_port *port,
175 unsigned int set, unsigned int clear)
176{
177 u8 val;
178 int status;
179 struct f81232_private *priv = usb_get_serial_port_data(port);
180
181 if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0)
182 return 0; /* no change */
183
184 /* 'set' takes precedence over 'clear' */
185 clear &= ~set;
186
187 /* force enable interrupt with OUT2 */
188 mutex_lock(&priv->lock);
189 val = UART_MCR_OUT2 | priv->modem_control;
190
191 if (clear & TIOCM_DTR)
192 val &= ~UART_MCR_DTR;
193
194 if (clear & TIOCM_RTS)
195 val &= ~UART_MCR_RTS;
196
197 if (set & TIOCM_DTR)
198 val |= UART_MCR_DTR;
199
200 if (set & TIOCM_RTS)
201 val |= UART_MCR_RTS;
202
203 dev_dbg(&port->dev, "%s new:%02x old:%02x\n", __func__,
204 val, priv->modem_control);
205
206 status = f81232_set_register(port, MODEM_CONTROL_REGISTER, val);
207 if (status) {
208 dev_err(&port->dev, "%s set MCR status < 0\n", __func__);
209 mutex_unlock(&priv->lock);
210 return status;
211 }
212
213 priv->modem_control = val;
214 mutex_unlock(&priv->lock);
215
216 return 0;
217}
218
219static void f81232_update_line_status(struct usb_serial_port *port,
220 unsigned char *data,
221 size_t actual_length)
222{
223 struct f81232_private *priv = usb_get_serial_port_data(port);
224
225 if (!actual_length)
226 return;
227
228 switch (data[0] & 0x07) {
229 case 0x00: /* msr change */
230 dev_dbg(&port->dev, "IIR: MSR Change: %02x\n", data[0]);
231 schedule_work(&priv->interrupt_work);
232 break;
233 case 0x02: /* tx-empty */
234 break;
235 case 0x04: /* rx data available */
236 break;
237 case 0x06: /* lsr change */
238 /* we can forget it. the LSR will read from bulk-in */
239 dev_dbg(&port->dev, "IIR: LSR Change: %02x\n", data[0]);
240 break;
241 }
242}
243
244static void f81232_read_int_callback(struct urb *urb)
245{
246 struct usb_serial_port *port = urb->context;
247 unsigned char *data = urb->transfer_buffer;
248 unsigned int actual_length = urb->actual_length;
249 int status = urb->status;
250 int retval;
251
252 switch (status) {
253 case 0:
254 /* success */
255 break;
256 case -ECONNRESET:
257 case -ENOENT:
258 case -ESHUTDOWN:
259 /* this urb is terminated, clean up */
260 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
261 __func__, status);
262 return;
263 default:
264 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
265 __func__, status);
266 goto exit;
267 }
268
269 usb_serial_debug_data(&port->dev, __func__,
270 urb->actual_length, urb->transfer_buffer);
271
272 f81232_update_line_status(port, data, actual_length);
273
274exit:
275 retval = usb_submit_urb(urb, GFP_ATOMIC);
276 if (retval)
277 dev_err(&urb->dev->dev,
278 "%s - usb_submit_urb failed with result %d\n",
279 __func__, retval);
280}
281
282static void f81232_process_read_urb(struct urb *urb)
283{
284 struct usb_serial_port *port = urb->context;
285 unsigned char *data = urb->transfer_buffer;
286 char tty_flag;
287 unsigned int i;
288 u8 lsr;
289
290 /*
291 * When opening the port we get a 1-byte packet with the current LSR,
292 * which we discard.
293 */
294 if ((urb->actual_length < 2) || (urb->actual_length % 2))
295 return;
296
297 /* bulk-in data: [LSR(1Byte)+DATA(1Byte)][LSR(1Byte)+DATA(1Byte)]... */
298
299 for (i = 0; i < urb->actual_length; i += 2) {
300 tty_flag = TTY_NORMAL;
301 lsr = data[i];
302
303 if (lsr & UART_LSR_BRK_ERROR_BITS) {
304 if (lsr & UART_LSR_BI) {
305 tty_flag = TTY_BREAK;
306 port->icount.brk++;
307 usb_serial_handle_break(port);
308 } else if (lsr & UART_LSR_PE) {
309 tty_flag = TTY_PARITY;
310 port->icount.parity++;
311 } else if (lsr & UART_LSR_FE) {
312 tty_flag = TTY_FRAME;
313 port->icount.frame++;
314 }
315
316 if (lsr & UART_LSR_OE) {
317 port->icount.overrun++;
318 tty_insert_flip_char(&port->port, 0,
319 TTY_OVERRUN);
320 }
321 }
322
323 if (port->port.console && port->sysrq) {
324 if (usb_serial_handle_sysrq_char(port, data[i + 1]))
325 continue;
326 }
327
328 tty_insert_flip_char(&port->port, data[i + 1], tty_flag);
329 }
330
331 tty_flip_buffer_push(&port->port);
332}
333
334static void f81232_break_ctl(struct tty_struct *tty, int break_state)
335{
336 /* FIXME - Stubbed out for now */
337
338 /*
339 * break_state = -1 to turn on break, and 0 to turn off break
340 * see drivers/char/tty_io.c to see it used.
341 * last_set_data_urb_value NEVER has the break bit set in it.
342 */
343}
344
345static void f81232_set_baudrate(struct usb_serial_port *port, speed_t baudrate)
346{
347 u8 lcr;
348 int divisor;
349 int status = 0;
350
351 divisor = calc_baud_divisor(baudrate);
352
353 status = f81232_get_register(port, LINE_CONTROL_REGISTER,
354 &lcr); /* get LCR */
355 if (status) {
356 dev_err(&port->dev, "%s failed to get LCR: %d\n",
357 __func__, status);
358 return;
359 }
360
361 status = f81232_set_register(port, LINE_CONTROL_REGISTER,
362 lcr | UART_LCR_DLAB); /* Enable DLAB */
363 if (status) {
364 dev_err(&port->dev, "%s failed to set DLAB: %d\n",
365 __func__, status);
366 return;
367 }
368
369 status = f81232_set_register(port, RECEIVE_BUFFER_REGISTER,
370 divisor & 0x00ff); /* low */
371 if (status) {
372 dev_err(&port->dev, "%s failed to set baudrate MSB: %d\n",
373 __func__, status);
374 goto reapply_lcr;
375 }
376
377 status = f81232_set_register(port, INTERRUPT_ENABLE_REGISTER,
378 (divisor & 0xff00) >> 8); /* high */
379 if (status) {
380 dev_err(&port->dev, "%s failed to set baudrate LSB: %d\n",
381 __func__, status);
382 }
383
384reapply_lcr:
385 status = f81232_set_register(port, LINE_CONTROL_REGISTER,
386 lcr & ~UART_LCR_DLAB);
387 if (status) {
388 dev_err(&port->dev, "%s failed to set DLAB: %d\n",
389 __func__, status);
390 }
391}
392
393static int f81232_port_enable(struct usb_serial_port *port)
394{
395 u8 val;
396 int status;
397
398 /* fifo on, trigger8, clear TX/RX*/
399 val = UART_FCR_TRIGGER_8 | UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR |
400 UART_FCR_CLEAR_XMIT;
401
402 status = f81232_set_register(port, FIFO_CONTROL_REGISTER, val);
403 if (status) {
404 dev_err(&port->dev, "%s failed to set FCR: %d\n",
405 __func__, status);
406 return status;
407 }
408
409 /* MSR Interrupt only, LSR will read from Bulk-in odd byte */
410 status = f81232_set_register(port, INTERRUPT_ENABLE_REGISTER,
411 UART_IER_MSI);
412 if (status) {
413 dev_err(&port->dev, "%s failed to set IER: %d\n",
414 __func__, status);
415 return status;
416 }
417
418 return 0;
419}
420
421static int f81232_port_disable(struct usb_serial_port *port)
422{
423 int status;
424
425 status = f81232_set_register(port, INTERRUPT_ENABLE_REGISTER, 0);
426 if (status) {
427 dev_err(&port->dev, "%s failed to set IER: %d\n",
428 __func__, status);
429 return status;
430 }
431
432 return 0;
433}
434
435static void f81232_set_termios(struct tty_struct *tty,
436 struct usb_serial_port *port, struct ktermios *old_termios)
437{
438 u8 new_lcr = 0;
439 int status = 0;
440 speed_t baudrate;
441
442 /* Don't change anything if nothing has changed */
443 if (old_termios && !tty_termios_hw_change(&tty->termios, old_termios))
444 return;
445
446 if (C_BAUD(tty) == B0)
447 f81232_set_mctrl(port, 0, TIOCM_DTR | TIOCM_RTS);
448 else if (old_termios && (old_termios->c_cflag & CBAUD) == B0)
449 f81232_set_mctrl(port, TIOCM_DTR | TIOCM_RTS, 0);
450
451 baudrate = tty_get_baud_rate(tty);
452 if (baudrate > 0) {
453 if (baudrate > F81232_MAX_BAUDRATE) {
454 baudrate = F81232_MAX_BAUDRATE;
455 tty_encode_baud_rate(tty, baudrate, baudrate);
456 }
457 f81232_set_baudrate(port, baudrate);
458 }
459
460 if (C_PARENB(tty)) {
461 new_lcr |= UART_LCR_PARITY;
462
463 if (!C_PARODD(tty))
464 new_lcr |= UART_LCR_EPAR;
465
466 if (C_CMSPAR(tty))
467 new_lcr |= UART_LCR_SPAR;
468 }
469
470 if (C_CSTOPB(tty))
471 new_lcr |= UART_LCR_STOP;
472
473 switch (C_CSIZE(tty)) {
474 case CS5:
475 new_lcr |= UART_LCR_WLEN5;
476 break;
477 case CS6:
478 new_lcr |= UART_LCR_WLEN6;
479 break;
480 case CS7:
481 new_lcr |= UART_LCR_WLEN7;
482 break;
483 default:
484 case CS8:
485 new_lcr |= UART_LCR_WLEN8;
486 break;
487 }
488
489 status = f81232_set_register(port, LINE_CONTROL_REGISTER, new_lcr);
490 if (status) {
491 dev_err(&port->dev, "%s failed to set LCR: %d\n",
492 __func__, status);
493 }
494}
495
496static int f81232_tiocmget(struct tty_struct *tty)
497{
498 int r;
499 struct usb_serial_port *port = tty->driver_data;
500 struct f81232_private *port_priv = usb_get_serial_port_data(port);
501 u8 mcr, msr;
502
503 /* force get current MSR changed state */
504 f81232_read_msr(port);
505
506 mutex_lock(&port_priv->lock);
507 mcr = port_priv->modem_control;
508 msr = port_priv->modem_status;
509 mutex_unlock(&port_priv->lock);
510
511 r = (mcr & UART_MCR_DTR ? TIOCM_DTR : 0) |
512 (mcr & UART_MCR_RTS ? TIOCM_RTS : 0) |
513 (msr & UART_MSR_CTS ? TIOCM_CTS : 0) |
514 (msr & UART_MSR_DCD ? TIOCM_CAR : 0) |
515 (msr & UART_MSR_RI ? TIOCM_RI : 0) |
516 (msr & UART_MSR_DSR ? TIOCM_DSR : 0);
517
518 return r;
519}
520
521static int f81232_tiocmset(struct tty_struct *tty,
522 unsigned int set, unsigned int clear)
523{
524 struct usb_serial_port *port = tty->driver_data;
525
526 return f81232_set_mctrl(port, set, clear);
527}
528
529static int f81232_open(struct tty_struct *tty, struct usb_serial_port *port)
530{
531 int result;
532
533 result = f81232_port_enable(port);
534 if (result)
535 return result;
536
537 /* Setup termios */
538 if (tty)
539 f81232_set_termios(tty, port, NULL);
540
541 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
542 if (result) {
543 dev_err(&port->dev, "%s - failed submitting interrupt urb,"
544 " error %d\n", __func__, result);
545 return result;
546 }
547
548 result = usb_serial_generic_open(tty, port);
549 if (result) {
550 usb_kill_urb(port->interrupt_in_urb);
551 return result;
552 }
553
554 return 0;
555}
556
557static void f81232_close(struct usb_serial_port *port)
558{
559 f81232_port_disable(port);
560 usb_serial_generic_close(port);
561 usb_kill_urb(port->interrupt_in_urb);
562}
563
564static void f81232_dtr_rts(struct usb_serial_port *port, int on)
565{
566 if (on)
567 f81232_set_mctrl(port, TIOCM_DTR | TIOCM_RTS, 0);
568 else
569 f81232_set_mctrl(port, 0, TIOCM_DTR | TIOCM_RTS);
570}
571
572static int f81232_carrier_raised(struct usb_serial_port *port)
573{
574 u8 msr;
575 struct f81232_private *priv = usb_get_serial_port_data(port);
576
577 mutex_lock(&priv->lock);
578 msr = priv->modem_status;
579 mutex_unlock(&priv->lock);
580
581 if (msr & UART_MSR_DCD)
582 return 1;
583 return 0;
584}
585
586static int f81232_get_serial_info(struct usb_serial_port *port,
587 unsigned long arg)
588{
589 struct serial_struct ser;
590
591 memset(&ser, 0, sizeof(ser));
592
593 ser.type = PORT_16550A;
594 ser.line = port->minor;
595 ser.port = port->port_number;
596 ser.baud_base = F81232_MAX_BAUDRATE;
597
598 if (copy_to_user((void __user *)arg, &ser, sizeof(ser)))
599 return -EFAULT;
600
601 return 0;
602}
603
604static int f81232_ioctl(struct tty_struct *tty,
605 unsigned int cmd, unsigned long arg)
606{
607 struct usb_serial_port *port = tty->driver_data;
608
609 switch (cmd) {
610 case TIOCGSERIAL:
611 return f81232_get_serial_info(port, arg);
612 default:
613 break;
614 }
615 return -ENOIOCTLCMD;
616}
617
618static void f81232_interrupt_work(struct work_struct *work)
619{
620 struct f81232_private *priv =
621 container_of(work, struct f81232_private, interrupt_work);
622
623 f81232_read_msr(priv->port);
624}
625
626static int f81232_port_probe(struct usb_serial_port *port)
627{
628 struct f81232_private *priv;
629
630 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
631 if (!priv)
632 return -ENOMEM;
633
634 mutex_init(&priv->lock);
635 INIT_WORK(&priv->interrupt_work, f81232_interrupt_work);
636
637 usb_set_serial_port_data(port, priv);
638
639 port->port.drain_delay = 256;
640 priv->port = port;
641
642 return 0;
643}
644
645static int f81232_port_remove(struct usb_serial_port *port)
646{
647 struct f81232_private *priv;
648
649 priv = usb_get_serial_port_data(port);
650 kfree(priv);
651
652 return 0;
653}
654
655static struct usb_serial_driver f81232_device = {
656 .driver = {
657 .owner = THIS_MODULE,
658 .name = "f81232",
659 },
660 .id_table = id_table,
661 .num_ports = 1,
662 .bulk_in_size = 256,
663 .bulk_out_size = 256,
664 .open = f81232_open,
665 .close = f81232_close,
666 .dtr_rts = f81232_dtr_rts,
667 .carrier_raised = f81232_carrier_raised,
668 .ioctl = f81232_ioctl,
669 .break_ctl = f81232_break_ctl,
670 .set_termios = f81232_set_termios,
671 .tiocmget = f81232_tiocmget,
672 .tiocmset = f81232_tiocmset,
673 .tiocmiwait = usb_serial_generic_tiocmiwait,
674 .process_read_urb = f81232_process_read_urb,
675 .read_int_callback = f81232_read_int_callback,
676 .port_probe = f81232_port_probe,
677 .port_remove = f81232_port_remove,
678};
679
680static struct usb_serial_driver * const serial_drivers[] = {
681 &f81232_device,
682 NULL,
683};
684
685module_usb_serial_driver(serial_drivers, id_table);
686
687MODULE_DESCRIPTION("Fintek F81232 USB to serial adaptor driver");
688MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@linuxfoundation.org>");
689MODULE_AUTHOR("Peter Hong <peter_hong@fintek.com.tw>");
690MODULE_LICENSE("GPL v2");