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40#include <linux/kernel.h>
41#include <linux/errno.h>
42#include <linux/init.h>
43#include <linux/slab.h>
44#include <linux/tty.h>
45#include <linux/tty_driver.h>
46#include <linux/tty_flip.h>
47#include <linux/serial.h>
48#include <linux/module.h>
49#include <linux/moduleparam.h>
50#include <linux/spinlock.h>
51#include <linux/usb.h>
52#include <linux/usb/serial.h>
53#include <linux/uaccess.h>
54#include <linux/kfifo.h>
55#include "oti6858.h"
56
57#define OTI6858_DESCRIPTION \
58 "Ours Technology Inc. OTi-6858 USB to serial adapter driver"
59#define OTI6858_AUTHOR "Tomasz Michal Lukaszewski <FIXME@FIXME>"
60
61static const struct usb_device_id id_table[] = {
62 { USB_DEVICE(OTI6858_VENDOR_ID, OTI6858_PRODUCT_ID) },
63 { }
64};
65
66MODULE_DEVICE_TABLE(usb, id_table);
67
68
69#define OTI6858_REQ_GET_STATUS (USB_DIR_IN | USB_TYPE_VENDOR | 0x00)
70#define OTI6858_REQ_T_GET_STATUS 0x01
71
72#define OTI6858_REQ_SET_LINE (USB_DIR_OUT | USB_TYPE_VENDOR | 0x00)
73#define OTI6858_REQ_T_SET_LINE 0x00
74
75#define OTI6858_REQ_CHECK_TXBUFF (USB_DIR_IN | USB_TYPE_VENDOR | 0x01)
76#define OTI6858_REQ_T_CHECK_TXBUFF 0x00
77
78
79struct oti6858_control_pkt {
80 __le16 divisor;
81#define OTI6858_MAX_BAUD_RATE 3000000
82 u8 frame_fmt;
83#define FMT_STOP_BITS_MASK 0xc0
84#define FMT_STOP_BITS_1 0x00
85#define FMT_STOP_BITS_2 0x40
86#define FMT_PARITY_MASK 0x38
87#define FMT_PARITY_NONE 0x00
88#define FMT_PARITY_ODD 0x08
89#define FMT_PARITY_EVEN 0x18
90#define FMT_PARITY_MARK 0x28
91#define FMT_PARITY_SPACE 0x38
92#define FMT_DATA_BITS_MASK 0x03
93#define FMT_DATA_BITS_5 0x00
94#define FMT_DATA_BITS_6 0x01
95#define FMT_DATA_BITS_7 0x02
96#define FMT_DATA_BITS_8 0x03
97 u8 something;
98 u8 control;
99#define CONTROL_MASK 0x0c
100#define CONTROL_DTR_HIGH 0x08
101#define CONTROL_RTS_HIGH 0x04
102 u8 tx_status;
103#define TX_BUFFER_EMPTIED 0x09
104 u8 pin_state;
105#define PIN_MASK 0x3f
106#define PIN_RTS 0x20
107#define PIN_CTS 0x10
108#define PIN_DSR 0x08
109#define PIN_DTR 0x04
110#define PIN_RI 0x02
111#define PIN_DCD 0x01
112 u8 rx_bytes_avail; ;
113};
114
115#define OTI6858_CTRL_PKT_SIZE sizeof(struct oti6858_control_pkt)
116#define OTI6858_CTRL_EQUALS_PENDING(a, priv) \
117 (((a)->divisor == (priv)->pending_setup.divisor) \
118 && ((a)->control == (priv)->pending_setup.control) \
119 && ((a)->frame_fmt == (priv)->pending_setup.frame_fmt))
120
121
122static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port);
123static void oti6858_close(struct usb_serial_port *port);
124static void oti6858_set_termios(struct tty_struct *tty,
125 struct usb_serial_port *port, struct ktermios *old);
126static void oti6858_init_termios(struct tty_struct *tty);
127static void oti6858_read_int_callback(struct urb *urb);
128static void oti6858_read_bulk_callback(struct urb *urb);
129static void oti6858_write_bulk_callback(struct urb *urb);
130static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port,
131 const unsigned char *buf, int count);
132static int oti6858_write_room(struct tty_struct *tty);
133static int oti6858_chars_in_buffer(struct tty_struct *tty);
134static int oti6858_tiocmget(struct tty_struct *tty);
135static int oti6858_tiocmset(struct tty_struct *tty,
136 unsigned int set, unsigned int clear);
137static int oti6858_tiocmiwait(struct tty_struct *tty, unsigned long arg);
138static int oti6858_port_probe(struct usb_serial_port *port);
139static int oti6858_port_remove(struct usb_serial_port *port);
140
141
142static struct usb_serial_driver oti6858_device = {
143 .driver = {
144 .owner = THIS_MODULE,
145 .name = "oti6858",
146 },
147 .id_table = id_table,
148 .num_ports = 1,
149 .open = oti6858_open,
150 .close = oti6858_close,
151 .write = oti6858_write,
152 .set_termios = oti6858_set_termios,
153 .init_termios = oti6858_init_termios,
154 .tiocmget = oti6858_tiocmget,
155 .tiocmset = oti6858_tiocmset,
156 .tiocmiwait = oti6858_tiocmiwait,
157 .read_bulk_callback = oti6858_read_bulk_callback,
158 .read_int_callback = oti6858_read_int_callback,
159 .write_bulk_callback = oti6858_write_bulk_callback,
160 .write_room = oti6858_write_room,
161 .chars_in_buffer = oti6858_chars_in_buffer,
162 .port_probe = oti6858_port_probe,
163 .port_remove = oti6858_port_remove,
164};
165
166static struct usb_serial_driver * const serial_drivers[] = {
167 &oti6858_device, NULL
168};
169
170struct oti6858_private {
171 spinlock_t lock;
172
173 struct oti6858_control_pkt status;
174
175 struct {
176 u8 read_urb_in_use;
177 u8 write_urb_in_use;
178 } flags;
179 struct delayed_work delayed_write_work;
180
181 struct {
182 __le16 divisor;
183 u8 frame_fmt;
184 u8 control;
185 } pending_setup;
186 u8 transient;
187 u8 setup_done;
188 struct delayed_work delayed_setup_work;
189
190 struct usb_serial_port *port;
191};
192
193static void setup_line(struct work_struct *work)
194{
195 struct oti6858_private *priv = container_of(work,
196 struct oti6858_private, delayed_setup_work.work);
197 struct usb_serial_port *port = priv->port;
198 struct oti6858_control_pkt *new_setup;
199 unsigned long flags;
200 int result;
201
202 new_setup = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL);
203 if (new_setup == NULL) {
204 dev_err(&port->dev, "%s(): out of memory!\n", __func__);
205
206 schedule_delayed_work(&priv->delayed_setup_work,
207 msecs_to_jiffies(2));
208 return;
209 }
210
211 result = usb_control_msg(port->serial->dev,
212 usb_rcvctrlpipe(port->serial->dev, 0),
213 OTI6858_REQ_T_GET_STATUS,
214 OTI6858_REQ_GET_STATUS,
215 0, 0,
216 new_setup, OTI6858_CTRL_PKT_SIZE,
217 100);
218
219 if (result != OTI6858_CTRL_PKT_SIZE) {
220 dev_err(&port->dev, "%s(): error reading status\n", __func__);
221 kfree(new_setup);
222
223 schedule_delayed_work(&priv->delayed_setup_work,
224 msecs_to_jiffies(2));
225 return;
226 }
227
228 spin_lock_irqsave(&priv->lock, flags);
229 if (!OTI6858_CTRL_EQUALS_PENDING(new_setup, priv)) {
230 new_setup->divisor = priv->pending_setup.divisor;
231 new_setup->control = priv->pending_setup.control;
232 new_setup->frame_fmt = priv->pending_setup.frame_fmt;
233
234 spin_unlock_irqrestore(&priv->lock, flags);
235 result = usb_control_msg(port->serial->dev,
236 usb_sndctrlpipe(port->serial->dev, 0),
237 OTI6858_REQ_T_SET_LINE,
238 OTI6858_REQ_SET_LINE,
239 0, 0,
240 new_setup, OTI6858_CTRL_PKT_SIZE,
241 100);
242 } else {
243 spin_unlock_irqrestore(&priv->lock, flags);
244 result = 0;
245 }
246 kfree(new_setup);
247
248 spin_lock_irqsave(&priv->lock, flags);
249 if (result != OTI6858_CTRL_PKT_SIZE)
250 priv->transient = 0;
251 priv->setup_done = 1;
252 spin_unlock_irqrestore(&priv->lock, flags);
253
254 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__);
255 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
256 if (result != 0) {
257 dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n",
258 __func__, result);
259 }
260}
261
262static void send_data(struct work_struct *work)
263{
264 struct oti6858_private *priv = container_of(work,
265 struct oti6858_private, delayed_write_work.work);
266 struct usb_serial_port *port = priv->port;
267 int count = 0, result;
268 unsigned long flags;
269 u8 *allow;
270
271 spin_lock_irqsave(&priv->lock, flags);
272 if (priv->flags.write_urb_in_use) {
273 spin_unlock_irqrestore(&priv->lock, flags);
274 schedule_delayed_work(&priv->delayed_write_work,
275 msecs_to_jiffies(2));
276 return;
277 }
278 priv->flags.write_urb_in_use = 1;
279 spin_unlock_irqrestore(&priv->lock, flags);
280
281 spin_lock_irqsave(&port->lock, flags);
282 count = kfifo_len(&port->write_fifo);
283 spin_unlock_irqrestore(&port->lock, flags);
284
285 if (count > port->bulk_out_size)
286 count = port->bulk_out_size;
287
288 if (count != 0) {
289 allow = kmalloc(1, GFP_KERNEL);
290 if (!allow) {
291 dev_err_console(port, "%s(): kmalloc failed\n",
292 __func__);
293 return;
294 }
295 result = usb_control_msg(port->serial->dev,
296 usb_rcvctrlpipe(port->serial->dev, 0),
297 OTI6858_REQ_T_CHECK_TXBUFF,
298 OTI6858_REQ_CHECK_TXBUFF,
299 count, 0, allow, 1, 100);
300 if (result != 1 || *allow != 0)
301 count = 0;
302 kfree(allow);
303 }
304
305 if (count == 0) {
306 priv->flags.write_urb_in_use = 0;
307
308 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__);
309 result = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO);
310 if (result != 0) {
311 dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n",
312 __func__, result);
313 }
314 return;
315 }
316
317 count = kfifo_out_locked(&port->write_fifo,
318 port->write_urb->transfer_buffer,
319 count, &port->lock);
320 port->write_urb->transfer_buffer_length = count;
321 result = usb_submit_urb(port->write_urb, GFP_NOIO);
322 if (result != 0) {
323 dev_err_console(port, "%s(): usb_submit_urb() failed with error %d\n",
324 __func__, result);
325 priv->flags.write_urb_in_use = 0;
326 }
327
328 usb_serial_port_softint(port);
329}
330
331static int oti6858_port_probe(struct usb_serial_port *port)
332{
333 struct oti6858_private *priv;
334
335 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
336 if (!priv)
337 return -ENOMEM;
338
339 spin_lock_init(&priv->lock);
340 priv->port = port;
341 INIT_DELAYED_WORK(&priv->delayed_setup_work, setup_line);
342 INIT_DELAYED_WORK(&priv->delayed_write_work, send_data);
343
344 usb_set_serial_port_data(port, priv);
345
346 return 0;
347}
348
349static int oti6858_port_remove(struct usb_serial_port *port)
350{
351 struct oti6858_private *priv;
352
353 priv = usb_get_serial_port_data(port);
354 kfree(priv);
355
356 return 0;
357}
358
359static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port,
360 const unsigned char *buf, int count)
361{
362 if (!count)
363 return count;
364
365 count = kfifo_in_locked(&port->write_fifo, buf, count, &port->lock);
366
367 return count;
368}
369
370static int oti6858_write_room(struct tty_struct *tty)
371{
372 struct usb_serial_port *port = tty->driver_data;
373 int room = 0;
374 unsigned long flags;
375
376 spin_lock_irqsave(&port->lock, flags);
377 room = kfifo_avail(&port->write_fifo);
378 spin_unlock_irqrestore(&port->lock, flags);
379
380 return room;
381}
382
383static int oti6858_chars_in_buffer(struct tty_struct *tty)
384{
385 struct usb_serial_port *port = tty->driver_data;
386 int chars = 0;
387 unsigned long flags;
388
389 spin_lock_irqsave(&port->lock, flags);
390 chars = kfifo_len(&port->write_fifo);
391 spin_unlock_irqrestore(&port->lock, flags);
392
393 return chars;
394}
395
396static void oti6858_init_termios(struct tty_struct *tty)
397{
398 tty->termios = tty_std_termios;
399 tty->termios.c_cflag = B38400 | CS8 | CREAD | HUPCL | CLOCAL;
400 tty->termios.c_ispeed = 38400;
401 tty->termios.c_ospeed = 38400;
402}
403
404static void oti6858_set_termios(struct tty_struct *tty,
405 struct usb_serial_port *port, struct ktermios *old_termios)
406{
407 struct oti6858_private *priv = usb_get_serial_port_data(port);
408 unsigned long flags;
409 unsigned int cflag;
410 u8 frame_fmt, control;
411 __le16 divisor;
412 int br;
413
414 if (!tty)
415 return;
416
417 cflag = tty->termios.c_cflag;
418
419 spin_lock_irqsave(&priv->lock, flags);
420 divisor = priv->pending_setup.divisor;
421 frame_fmt = priv->pending_setup.frame_fmt;
422 control = priv->pending_setup.control;
423 spin_unlock_irqrestore(&priv->lock, flags);
424
425 frame_fmt &= ~FMT_DATA_BITS_MASK;
426 switch (cflag & CSIZE) {
427 case CS5:
428 frame_fmt |= FMT_DATA_BITS_5;
429 break;
430 case CS6:
431 frame_fmt |= FMT_DATA_BITS_6;
432 break;
433 case CS7:
434 frame_fmt |= FMT_DATA_BITS_7;
435 break;
436 default:
437 case CS8:
438 frame_fmt |= FMT_DATA_BITS_8;
439 break;
440 }
441
442
443
444
445
446
447 br = tty_get_baud_rate(tty);
448 if (br == 0) {
449 divisor = 0;
450 } else {
451 int real_br;
452 int new_divisor;
453 br = min(br, OTI6858_MAX_BAUD_RATE);
454
455 new_divisor = (96000000 + 8 * br) / (16 * br);
456 real_br = 96000000 / (16 * new_divisor);
457 divisor = cpu_to_le16(new_divisor);
458 tty_encode_baud_rate(tty, real_br, real_br);
459 }
460
461 frame_fmt &= ~FMT_STOP_BITS_MASK;
462 if ((cflag & CSTOPB) != 0)
463 frame_fmt |= FMT_STOP_BITS_2;
464 else
465 frame_fmt |= FMT_STOP_BITS_1;
466
467 frame_fmt &= ~FMT_PARITY_MASK;
468 if ((cflag & PARENB) != 0) {
469 if ((cflag & PARODD) != 0)
470 frame_fmt |= FMT_PARITY_ODD;
471 else
472 frame_fmt |= FMT_PARITY_EVEN;
473 } else {
474 frame_fmt |= FMT_PARITY_NONE;
475 }
476
477 control &= ~CONTROL_MASK;
478 if ((cflag & CRTSCTS) != 0)
479 control |= (CONTROL_DTR_HIGH | CONTROL_RTS_HIGH);
480
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497
498 spin_lock_irqsave(&priv->lock, flags);
499 if (divisor != priv->pending_setup.divisor
500 || control != priv->pending_setup.control
501 || frame_fmt != priv->pending_setup.frame_fmt) {
502 priv->pending_setup.divisor = divisor;
503 priv->pending_setup.control = control;
504 priv->pending_setup.frame_fmt = frame_fmt;
505 }
506 spin_unlock_irqrestore(&priv->lock, flags);
507}
508
509static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port)
510{
511 struct oti6858_private *priv = usb_get_serial_port_data(port);
512 struct ktermios tmp_termios;
513 struct usb_serial *serial = port->serial;
514 struct oti6858_control_pkt *buf;
515 unsigned long flags;
516 int result;
517
518 usb_clear_halt(serial->dev, port->write_urb->pipe);
519 usb_clear_halt(serial->dev, port->read_urb->pipe);
520
521 buf = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL);
522 if (buf == NULL) {
523 dev_err(&port->dev, "%s(): out of memory!\n", __func__);
524 return -ENOMEM;
525 }
526
527 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
528 OTI6858_REQ_T_GET_STATUS,
529 OTI6858_REQ_GET_STATUS,
530 0, 0,
531 buf, OTI6858_CTRL_PKT_SIZE,
532 100);
533 if (result != OTI6858_CTRL_PKT_SIZE) {
534
535 buf->divisor = cpu_to_le16(0x009c);
536 buf->frame_fmt = 0x03;
537 buf->something = 0x43;
538 buf->control = 0x4c;
539 buf->tx_status = 0x00;
540 buf->pin_state = 0x5b;
541 buf->rx_bytes_avail = 0x00;
542 }
543
544 spin_lock_irqsave(&priv->lock, flags);
545 memcpy(&priv->status, buf, OTI6858_CTRL_PKT_SIZE);
546 priv->pending_setup.divisor = buf->divisor;
547 priv->pending_setup.frame_fmt = buf->frame_fmt;
548 priv->pending_setup.control = buf->control;
549 spin_unlock_irqrestore(&priv->lock, flags);
550 kfree(buf);
551
552 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__);
553 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
554 if (result != 0) {
555 dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n",
556 __func__, result);
557 oti6858_close(port);
558 return result;
559 }
560
561
562 if (tty)
563 oti6858_set_termios(tty, port, &tmp_termios);
564 port->port.drain_delay = 256;
565 return 0;
566}
567
568static void oti6858_close(struct usb_serial_port *port)
569{
570 struct oti6858_private *priv = usb_get_serial_port_data(port);
571 unsigned long flags;
572
573 spin_lock_irqsave(&port->lock, flags);
574
575 kfifo_reset_out(&port->write_fifo);
576 spin_unlock_irqrestore(&port->lock, flags);
577
578 dev_dbg(&port->dev, "%s(): after buf_clear()\n", __func__);
579
580
581 cancel_delayed_work_sync(&priv->delayed_setup_work);
582 cancel_delayed_work_sync(&priv->delayed_write_work);
583
584
585 dev_dbg(&port->dev, "%s(): shutting down urbs\n", __func__);
586 usb_kill_urb(port->write_urb);
587 usb_kill_urb(port->read_urb);
588 usb_kill_urb(port->interrupt_in_urb);
589}
590
591static int oti6858_tiocmset(struct tty_struct *tty,
592 unsigned int set, unsigned int clear)
593{
594 struct usb_serial_port *port = tty->driver_data;
595 struct oti6858_private *priv = usb_get_serial_port_data(port);
596 unsigned long flags;
597 u8 control;
598
599 dev_dbg(&port->dev, "%s(set = 0x%08x, clear = 0x%08x)\n",
600 __func__, set, clear);
601
602
603 spin_lock_irqsave(&priv->lock, flags);
604 control = priv->pending_setup.control;
605 if ((set & TIOCM_RTS) != 0)
606 control |= CONTROL_RTS_HIGH;
607 if ((set & TIOCM_DTR) != 0)
608 control |= CONTROL_DTR_HIGH;
609 if ((clear & TIOCM_RTS) != 0)
610 control &= ~CONTROL_RTS_HIGH;
611 if ((clear & TIOCM_DTR) != 0)
612 control &= ~CONTROL_DTR_HIGH;
613
614 if (control != priv->pending_setup.control)
615 priv->pending_setup.control = control;
616
617 spin_unlock_irqrestore(&priv->lock, flags);
618 return 0;
619}
620
621static int oti6858_tiocmget(struct tty_struct *tty)
622{
623 struct usb_serial_port *port = tty->driver_data;
624 struct oti6858_private *priv = usb_get_serial_port_data(port);
625 unsigned long flags;
626 unsigned pin_state;
627 unsigned result = 0;
628
629 spin_lock_irqsave(&priv->lock, flags);
630 pin_state = priv->status.pin_state & PIN_MASK;
631 spin_unlock_irqrestore(&priv->lock, flags);
632
633
634 if ((pin_state & PIN_RTS) != 0)
635 result |= TIOCM_RTS;
636 if ((pin_state & PIN_CTS) != 0)
637 result |= TIOCM_CTS;
638 if ((pin_state & PIN_DSR) != 0)
639 result |= TIOCM_DSR;
640 if ((pin_state & PIN_DTR) != 0)
641 result |= TIOCM_DTR;
642 if ((pin_state & PIN_RI) != 0)
643 result |= TIOCM_RI;
644 if ((pin_state & PIN_DCD) != 0)
645 result |= TIOCM_CD;
646
647 dev_dbg(&port->dev, "%s() = 0x%08x\n", __func__, result);
648
649 return result;
650}
651
652static int oti6858_tiocmiwait(struct tty_struct *tty, unsigned long arg)
653{
654 struct usb_serial_port *port = tty->driver_data;
655 struct oti6858_private *priv = usb_get_serial_port_data(port);
656 unsigned long flags;
657 unsigned int prev, status;
658 unsigned int changed;
659
660 spin_lock_irqsave(&priv->lock, flags);
661 prev = priv->status.pin_state;
662 spin_unlock_irqrestore(&priv->lock, flags);
663
664 while (1) {
665 wait_event_interruptible(port->port.delta_msr_wait,
666 port->serial->disconnected ||
667 priv->status.pin_state != prev);
668 if (signal_pending(current))
669 return -ERESTARTSYS;
670
671 if (port->serial->disconnected)
672 return -EIO;
673
674 spin_lock_irqsave(&priv->lock, flags);
675 status = priv->status.pin_state & PIN_MASK;
676 spin_unlock_irqrestore(&priv->lock, flags);
677
678 changed = prev ^ status;
679
680 if (((arg & TIOCM_RNG) && (changed & PIN_RI)) ||
681 ((arg & TIOCM_DSR) && (changed & PIN_DSR)) ||
682 ((arg & TIOCM_CD) && (changed & PIN_DCD)) ||
683 ((arg & TIOCM_CTS) && (changed & PIN_CTS)))
684 return 0;
685 prev = status;
686 }
687
688
689 return 0;
690}
691
692static void oti6858_read_int_callback(struct urb *urb)
693{
694 struct usb_serial_port *port = urb->context;
695 struct oti6858_private *priv = usb_get_serial_port_data(port);
696 int transient = 0, can_recv = 0, resubmit = 1;
697 int status = urb->status;
698
699 switch (status) {
700 case 0:
701
702 break;
703 case -ECONNRESET:
704 case -ENOENT:
705 case -ESHUTDOWN:
706
707 dev_dbg(&urb->dev->dev, "%s(): urb shutting down with status: %d\n",
708 __func__, status);
709 return;
710 default:
711 dev_dbg(&urb->dev->dev, "%s(): nonzero urb status received: %d\n",
712 __func__, status);
713 break;
714 }
715
716 if (status == 0 && urb->actual_length == OTI6858_CTRL_PKT_SIZE) {
717 struct oti6858_control_pkt *xs = urb->transfer_buffer;
718 unsigned long flags;
719
720 spin_lock_irqsave(&priv->lock, flags);
721
722 if (!priv->transient) {
723 if (!OTI6858_CTRL_EQUALS_PENDING(xs, priv)) {
724 if (xs->rx_bytes_avail == 0) {
725 priv->transient = 4;
726 priv->setup_done = 0;
727 resubmit = 0;
728 dev_dbg(&port->dev, "%s(): scheduling setup_line()\n", __func__);
729 schedule_delayed_work(&priv->delayed_setup_work, 0);
730 }
731 }
732 } else {
733 if (OTI6858_CTRL_EQUALS_PENDING(xs, priv)) {
734 priv->transient = 0;
735 } else if (!priv->setup_done) {
736 resubmit = 0;
737 } else if (--priv->transient == 0) {
738 if (xs->rx_bytes_avail == 0) {
739 priv->transient = 4;
740 priv->setup_done = 0;
741 resubmit = 0;
742 dev_dbg(&port->dev, "%s(): scheduling setup_line()\n", __func__);
743 schedule_delayed_work(&priv->delayed_setup_work, 0);
744 }
745 }
746 }
747
748 if (!priv->transient) {
749 if (xs->pin_state != priv->status.pin_state)
750 wake_up_interruptible(&port->port.delta_msr_wait);
751 memcpy(&priv->status, xs, OTI6858_CTRL_PKT_SIZE);
752 }
753
754 if (!priv->transient && xs->rx_bytes_avail != 0) {
755 can_recv = xs->rx_bytes_avail;
756 priv->flags.read_urb_in_use = 1;
757 }
758
759 transient = priv->transient;
760 spin_unlock_irqrestore(&priv->lock, flags);
761 }
762
763 if (can_recv) {
764 int result;
765
766 result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
767 if (result != 0) {
768 priv->flags.read_urb_in_use = 0;
769 dev_err(&port->dev, "%s(): usb_submit_urb() failed,"
770 " error %d\n", __func__, result);
771 } else {
772 resubmit = 0;
773 }
774 } else if (!transient) {
775 unsigned long flags;
776 int count;
777
778 spin_lock_irqsave(&port->lock, flags);
779 count = kfifo_len(&port->write_fifo);
780 spin_unlock_irqrestore(&port->lock, flags);
781
782 spin_lock_irqsave(&priv->lock, flags);
783 if (priv->flags.write_urb_in_use == 0 && count != 0) {
784 schedule_delayed_work(&priv->delayed_write_work, 0);
785 resubmit = 0;
786 }
787 spin_unlock_irqrestore(&priv->lock, flags);
788 }
789
790 if (resubmit) {
791 int result;
792
793
794 result = usb_submit_urb(urb, GFP_ATOMIC);
795 if (result != 0) {
796 dev_err(&urb->dev->dev,
797 "%s(): usb_submit_urb() failed with"
798 " error %d\n", __func__, result);
799 }
800 }
801}
802
803static void oti6858_read_bulk_callback(struct urb *urb)
804{
805 struct usb_serial_port *port = urb->context;
806 struct oti6858_private *priv = usb_get_serial_port_data(port);
807 unsigned char *data = urb->transfer_buffer;
808 unsigned long flags;
809 int status = urb->status;
810 int result;
811
812 spin_lock_irqsave(&priv->lock, flags);
813 priv->flags.read_urb_in_use = 0;
814 spin_unlock_irqrestore(&priv->lock, flags);
815
816 if (status != 0) {
817 dev_dbg(&urb->dev->dev, "%s(): unable to handle the error, exiting\n", __func__);
818 return;
819 }
820
821 if (urb->actual_length > 0) {
822 tty_insert_flip_string(&port->port, data, urb->actual_length);
823 tty_flip_buffer_push(&port->port);
824 }
825
826
827 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
828 if (result != 0 && result != -EPERM) {
829 dev_err(&port->dev, "%s(): usb_submit_urb() failed,"
830 " error %d\n", __func__, result);
831 }
832}
833
834static void oti6858_write_bulk_callback(struct urb *urb)
835{
836 struct usb_serial_port *port = urb->context;
837 struct oti6858_private *priv = usb_get_serial_port_data(port);
838 int status = urb->status;
839 int result;
840
841 switch (status) {
842 case 0:
843
844 break;
845 case -ECONNRESET:
846 case -ENOENT:
847 case -ESHUTDOWN:
848
849 dev_dbg(&urb->dev->dev, "%s(): urb shutting down with status: %d\n", __func__, status);
850 priv->flags.write_urb_in_use = 0;
851 return;
852 default:
853
854 dev_dbg(&urb->dev->dev, "%s(): nonzero write bulk status received: %d\n", __func__, status);
855 dev_dbg(&urb->dev->dev, "%s(): overflow in write\n", __func__);
856
857 port->write_urb->transfer_buffer_length = 1;
858 result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
859 if (result) {
860 dev_err_console(port, "%s(): usb_submit_urb() failed,"
861 " error %d\n", __func__, result);
862 } else {
863 return;
864 }
865 }
866
867 priv->flags.write_urb_in_use = 0;
868
869
870 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__);
871 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
872 if (result != 0) {
873 dev_err(&port->dev, "%s(): failed submitting int urb,"
874 " error %d\n", __func__, result);
875 }
876}
877
878module_usb_serial_driver(serial_drivers, id_table);
879
880MODULE_DESCRIPTION(OTI6858_DESCRIPTION);
881MODULE_AUTHOR(OTI6858_AUTHOR);
882MODULE_LICENSE("GPL");
883
