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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/*
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/init.h>
16#include <linux/slab.h>
17#include <linux/tty.h>
18#include <linux/tty_driver.h>
19#include <linux/tty_flip.h>
20#include <linux/serial.h>
21#include <linux/module.h>
22#include <linux/moduleparam.h>
23#include <linux/spinlock.h>
24#include <linux/uaccess.h>
25#include <linux/usb.h>
26#include <linux/usb/serial.h>
27
28static bool debug;
29
30static const struct usb_device_id id_table[] = {
31 { USB_DEVICE(0x1934, 0x0706) },
32 { } /* Terminating entry */
33};
34MODULE_DEVICE_TABLE(usb, id_table);
35
36#define CONTROL_DTR 0x01
37#define CONTROL_RTS 0x02
38
39#define UART_STATE 0x08
40#define UART_STATE_TRANSIENT_MASK 0x74
41#define UART_DCD 0x01
42#define UART_DSR 0x02
43#define UART_BREAK_ERROR 0x04
44#define UART_RING 0x08
45#define UART_FRAME_ERROR 0x10
46#define UART_PARITY_ERROR 0x20
47#define UART_OVERRUN_ERROR 0x40
48#define UART_CTS 0x80
49
50struct f81232_private {
51 spinlock_t lock;
52 wait_queue_head_t delta_msr_wait;
53 u8 line_control;
54 u8 line_status;
55};
56
57static void f81232_update_line_status(struct usb_serial_port *port,
58 unsigned char *data,
59 unsigned int actual_length)
60{
61}
62
63static void f81232_read_int_callback(struct urb *urb)
64{
65 struct usb_serial_port *port = urb->context;
66 unsigned char *data = urb->transfer_buffer;
67 unsigned int actual_length = urb->actual_length;
68 int status = urb->status;
69 int retval;
70
71 switch (status) {
72 case 0:
73 /* success */
74 break;
75 case -ECONNRESET:
76 case -ENOENT:
77 case -ESHUTDOWN:
78 /* this urb is terminated, clean up */
79 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
80 __func__, status);
81 return;
82 default:
83 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
84 __func__, status);
85 goto exit;
86 }
87
88 usb_serial_debug_data(debug, &port->dev, __func__,
89 urb->actual_length, urb->transfer_buffer);
90
91 f81232_update_line_status(port, data, actual_length);
92
93exit:
94 retval = usb_submit_urb(urb, GFP_ATOMIC);
95 if (retval)
96 dev_err(&urb->dev->dev,
97 "%s - usb_submit_urb failed with result %d\n",
98 __func__, retval);
99}
100
101static void f81232_process_read_urb(struct urb *urb)
102{
103 struct usb_serial_port *port = urb->context;
104 struct f81232_private *priv = usb_get_serial_port_data(port);
105 struct tty_struct *tty;
106 unsigned char *data = urb->transfer_buffer;
107 char tty_flag = TTY_NORMAL;
108 unsigned long flags;
109 u8 line_status;
110 int i;
111
112 /* update line status */
113 spin_lock_irqsave(&priv->lock, flags);
114 line_status = priv->line_status;
115 priv->line_status &= ~UART_STATE_TRANSIENT_MASK;
116 spin_unlock_irqrestore(&priv->lock, flags);
117 wake_up_interruptible(&priv->delta_msr_wait);
118
119 if (!urb->actual_length)
120 return;
121
122 tty = tty_port_tty_get(&port->port);
123 if (!tty)
124 return;
125
126 /* break takes precedence over parity, */
127 /* which takes precedence over framing errors */
128 if (line_status & UART_BREAK_ERROR)
129 tty_flag = TTY_BREAK;
130 else if (line_status & UART_PARITY_ERROR)
131 tty_flag = TTY_PARITY;
132 else if (line_status & UART_FRAME_ERROR)
133 tty_flag = TTY_FRAME;
134 dev_dbg(&port->dev, "%s - tty_flag = %d\n", __func__, tty_flag);
135
136 /* overrun is special, not associated with a char */
137 if (line_status & UART_OVERRUN_ERROR)
138 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
139
140 if (port->port.console && port->sysrq) {
141 for (i = 0; i < urb->actual_length; ++i)
142 if (!usb_serial_handle_sysrq_char(port, data[i]))
143 tty_insert_flip_char(tty, data[i], tty_flag);
144 } else {
145 tty_insert_flip_string_fixed_flag(tty, data, tty_flag,
146 urb->actual_length);
147 }
148
149 tty_flip_buffer_push(tty);
150 tty_kref_put(tty);
151}
152
153static int set_control_lines(struct usb_device *dev, u8 value)
154{
155 /* FIXME - Stubbed out for now */
156 return 0;
157}
158
159static void f81232_break_ctl(struct tty_struct *tty, int break_state)
160{
161 /* FIXME - Stubbed out for now */
162
163 /*
164 * break_state = -1 to turn on break, and 0 to turn off break
165 * see drivers/char/tty_io.c to see it used.
166 * last_set_data_urb_value NEVER has the break bit set in it.
167 */
168}
169
170static void f81232_set_termios(struct tty_struct *tty,
171 struct usb_serial_port *port, struct ktermios *old_termios)
172{
173 /* FIXME - Stubbed out for now */
174
175 /* Don't change anything if nothing has changed */
176 if (!tty_termios_hw_change(tty->termios, old_termios))
177 return;
178
179 /* Do the real work here... */
180}
181
182static int f81232_tiocmget(struct tty_struct *tty)
183{
184 /* FIXME - Stubbed out for now */
185 return 0;
186}
187
188static int f81232_tiocmset(struct tty_struct *tty,
189 unsigned int set, unsigned int clear)
190{
191 /* FIXME - Stubbed out for now */
192 return 0;
193}
194
195static int f81232_open(struct tty_struct *tty, struct usb_serial_port *port)
196{
197 struct ktermios tmp_termios;
198 int result;
199
200 /* Setup termios */
201 if (tty)
202 f81232_set_termios(tty, port, &tmp_termios);
203
204 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
205 if (result) {
206 dev_err(&port->dev, "%s - failed submitting interrupt urb,"
207 " error %d\n", __func__, result);
208 return result;
209 }
210
211 result = usb_serial_generic_open(tty, port);
212 if (result) {
213 usb_kill_urb(port->interrupt_in_urb);
214 return result;
215 }
216
217 port->port.drain_delay = 256;
218 return 0;
219}
220
221static void f81232_close(struct usb_serial_port *port)
222{
223 usb_serial_generic_close(port);
224 usb_kill_urb(port->interrupt_in_urb);
225}
226
227static void f81232_dtr_rts(struct usb_serial_port *port, int on)
228{
229 struct f81232_private *priv = usb_get_serial_port_data(port);
230 unsigned long flags;
231 u8 control;
232
233 spin_lock_irqsave(&priv->lock, flags);
234 /* Change DTR and RTS */
235 if (on)
236 priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
237 else
238 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
239 control = priv->line_control;
240 spin_unlock_irqrestore(&priv->lock, flags);
241 set_control_lines(port->serial->dev, control);
242}
243
244static int f81232_carrier_raised(struct usb_serial_port *port)
245{
246 struct f81232_private *priv = usb_get_serial_port_data(port);
247 if (priv->line_status & UART_DCD)
248 return 1;
249 return 0;
250}
251
252static int wait_modem_info(struct usb_serial_port *port, unsigned int arg)
253{
254 struct f81232_private *priv = usb_get_serial_port_data(port);
255 unsigned long flags;
256 unsigned int prevstatus;
257 unsigned int status;
258 unsigned int changed;
259
260 spin_lock_irqsave(&priv->lock, flags);
261 prevstatus = priv->line_status;
262 spin_unlock_irqrestore(&priv->lock, flags);
263
264 while (1) {
265 interruptible_sleep_on(&priv->delta_msr_wait);
266 /* see if a signal did it */
267 if (signal_pending(current))
268 return -ERESTARTSYS;
269
270 spin_lock_irqsave(&priv->lock, flags);
271 status = priv->line_status;
272 spin_unlock_irqrestore(&priv->lock, flags);
273
274 changed = prevstatus ^ status;
275
276 if (((arg & TIOCM_RNG) && (changed & UART_RING)) ||
277 ((arg & TIOCM_DSR) && (changed & UART_DSR)) ||
278 ((arg & TIOCM_CD) && (changed & UART_DCD)) ||
279 ((arg & TIOCM_CTS) && (changed & UART_CTS))) {
280 return 0;
281 }
282 prevstatus = status;
283 }
284 /* NOTREACHED */
285 return 0;
286}
287
288static int f81232_ioctl(struct tty_struct *tty,
289 unsigned int cmd, unsigned long arg)
290{
291 struct serial_struct ser;
292 struct usb_serial_port *port = tty->driver_data;
293
294 dev_dbg(&port->dev, "%s (%d) cmd = 0x%04x\n", __func__,
295 port->number, cmd);
296
297 switch (cmd) {
298 case TIOCGSERIAL:
299 memset(&ser, 0, sizeof ser);
300 ser.type = PORT_16654;
301 ser.line = port->serial->minor;
302 ser.port = port->number;
303 ser.baud_base = 460800;
304
305 if (copy_to_user((void __user *)arg, &ser, sizeof ser))
306 return -EFAULT;
307
308 return 0;
309
310 case TIOCMIWAIT:
311 dev_dbg(&port->dev, "%s (%d) TIOCMIWAIT\n", __func__,
312 port->number);
313 return wait_modem_info(port, arg);
314 default:
315 dev_dbg(&port->dev, "%s not supported = 0x%04x\n",
316 __func__, cmd);
317 break;
318 }
319 return -ENOIOCTLCMD;
320}
321
322static int f81232_startup(struct usb_serial *serial)
323{
324 struct f81232_private *priv;
325 int i;
326
327 for (i = 0; i < serial->num_ports; ++i) {
328 priv = kzalloc(sizeof(struct f81232_private), GFP_KERNEL);
329 if (!priv)
330 goto cleanup;
331 spin_lock_init(&priv->lock);
332 init_waitqueue_head(&priv->delta_msr_wait);
333 usb_set_serial_port_data(serial->port[i], priv);
334 }
335 return 0;
336
337cleanup:
338 for (--i; i >= 0; --i) {
339 priv = usb_get_serial_port_data(serial->port[i]);
340 kfree(priv);
341 usb_set_serial_port_data(serial->port[i], NULL);
342 }
343 return -ENOMEM;
344}
345
346static void f81232_release(struct usb_serial *serial)
347{
348 int i;
349 struct f81232_private *priv;
350
351 for (i = 0; i < serial->num_ports; ++i) {
352 priv = usb_get_serial_port_data(serial->port[i]);
353 kfree(priv);
354 }
355}
356
357static struct usb_serial_driver f81232_device = {
358 .driver = {
359 .owner = THIS_MODULE,
360 .name = "f81232",
361 },
362 .id_table = id_table,
363 .num_ports = 1,
364 .bulk_in_size = 256,
365 .bulk_out_size = 256,
366 .open = f81232_open,
367 .close = f81232_close,
368 .dtr_rts = f81232_dtr_rts,
369 .carrier_raised = f81232_carrier_raised,
370 .ioctl = f81232_ioctl,
371 .break_ctl = f81232_break_ctl,
372 .set_termios = f81232_set_termios,
373 .tiocmget = f81232_tiocmget,
374 .tiocmset = f81232_tiocmset,
375 .process_read_urb = f81232_process_read_urb,
376 .read_int_callback = f81232_read_int_callback,
377 .attach = f81232_startup,
378 .release = f81232_release,
379};
380
381static struct usb_serial_driver * const serial_drivers[] = {
382 &f81232_device,
383 NULL,
384};
385
386module_usb_serial_driver(serial_drivers, id_table);
387
388MODULE_DESCRIPTION("Fintek F81232 USB to serial adaptor driver");
389MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@linuxfoundation.org");
390MODULE_LICENSE("GPL v2");
391
392module_param(debug, bool, S_IRUGO | S_IWUSR);
393MODULE_PARM_DESC(debug, "Debug enabled or not");
394