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40#include <linux/kernel.h>
41#include <linux/errno.h>
42#include <linux/slab.h>
43#include <linux/tty.h>
44#include <linux/tty_driver.h>
45#include <linux/tty_flip.h>
46#include <linux/serial.h>
47#include <linux/module.h>
48#include <linux/moduleparam.h>
49#include <linux/spinlock.h>
50#include <linux/usb.h>
51#include <linux/usb/serial.h>
52#include <linux/uaccess.h>
53#include <linux/kfifo.h>
54#include "oti6858.h"
55
56#define OTI6858_DESCRIPTION \
57 "Ours Technology Inc. OTi-6858 USB to serial adapter driver"
58#define OTI6858_AUTHOR "Tomasz Michal Lukaszewski <FIXME@FIXME>"
59
60static const struct usb_device_id id_table[] = {
61 { USB_DEVICE(OTI6858_VENDOR_ID, OTI6858_PRODUCT_ID) },
62 { }
63};
64
65MODULE_DEVICE_TABLE(usb, id_table);
66
67
68#define OTI6858_REQ_GET_STATUS (USB_DIR_IN | USB_TYPE_VENDOR | 0x00)
69#define OTI6858_REQ_T_GET_STATUS 0x01
70
71#define OTI6858_REQ_SET_LINE (USB_DIR_OUT | USB_TYPE_VENDOR | 0x00)
72#define OTI6858_REQ_T_SET_LINE 0x00
73
74#define OTI6858_REQ_CHECK_TXBUFF (USB_DIR_IN | USB_TYPE_VENDOR | 0x01)
75#define OTI6858_REQ_T_CHECK_TXBUFF 0x00
76
77
78struct oti6858_control_pkt {
79 __le16 divisor;
80#define OTI6858_MAX_BAUD_RATE 3000000
81 u8 frame_fmt;
82#define FMT_STOP_BITS_MASK 0xc0
83#define FMT_STOP_BITS_1 0x00
84#define FMT_STOP_BITS_2 0x40
85#define FMT_PARITY_MASK 0x38
86#define FMT_PARITY_NONE 0x00
87#define FMT_PARITY_ODD 0x08
88#define FMT_PARITY_EVEN 0x18
89#define FMT_PARITY_MARK 0x28
90#define FMT_PARITY_SPACE 0x38
91#define FMT_DATA_BITS_MASK 0x03
92#define FMT_DATA_BITS_5 0x00
93#define FMT_DATA_BITS_6 0x01
94#define FMT_DATA_BITS_7 0x02
95#define FMT_DATA_BITS_8 0x03
96 u8 something;
97 u8 control;
98#define CONTROL_MASK 0x0c
99#define CONTROL_DTR_HIGH 0x08
100#define CONTROL_RTS_HIGH 0x04
101 u8 tx_status;
102#define TX_BUFFER_EMPTIED 0x09
103 u8 pin_state;
104#define PIN_MASK 0x3f
105#define PIN_MSR_MASK 0x1b
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_port_probe(struct usb_serial_port *port);
138static int oti6858_port_remove(struct usb_serial_port *port);
139
140
141static struct usb_serial_driver oti6858_device = {
142 .driver = {
143 .owner = THIS_MODULE,
144 .name = "oti6858",
145 },
146 .id_table = id_table,
147 .num_ports = 1,
148 .num_bulk_in = 1,
149 .num_bulk_out = 1,
150 .num_interrupt_in = 1,
151 .open = oti6858_open,
152 .close = oti6858_close,
153 .write = oti6858_write,
154 .set_termios = oti6858_set_termios,
155 .init_termios = oti6858_init_termios,
156 .tiocmget = oti6858_tiocmget,
157 .tiocmset = oti6858_tiocmset,
158 .tiocmiwait = usb_serial_generic_tiocmiwait,
159 .read_bulk_callback = oti6858_read_bulk_callback,
160 .read_int_callback = oti6858_read_int_callback,
161 .write_bulk_callback = oti6858_write_bulk_callback,
162 .write_room = oti6858_write_room,
163 .chars_in_buffer = oti6858_chars_in_buffer,
164 .port_probe = oti6858_port_probe,
165 .port_remove = oti6858_port_remove,
166};
167
168static struct usb_serial_driver * const serial_drivers[] = {
169 &oti6858_device, NULL
170};
171
172struct oti6858_private {
173 spinlock_t lock;
174
175 struct oti6858_control_pkt status;
176
177 struct {
178 u8 read_urb_in_use;
179 u8 write_urb_in_use;
180 } flags;
181 struct delayed_work delayed_write_work;
182
183 struct {
184 __le16 divisor;
185 u8 frame_fmt;
186 u8 control;
187 } pending_setup;
188 u8 transient;
189 u8 setup_done;
190 struct delayed_work delayed_setup_work;
191
192 struct usb_serial_port *port;
193};
194
195static void setup_line(struct work_struct *work)
196{
197 struct oti6858_private *priv = container_of(work,
198 struct oti6858_private, delayed_setup_work.work);
199 struct usb_serial_port *port = priv->port;
200 struct oti6858_control_pkt *new_setup;
201 unsigned long flags;
202 int result;
203
204 new_setup = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL);
205 if (!new_setup) {
206
207 schedule_delayed_work(&priv->delayed_setup_work,
208 msecs_to_jiffies(2));
209 return;
210 }
211
212 result = usb_control_msg(port->serial->dev,
213 usb_rcvctrlpipe(port->serial->dev, 0),
214 OTI6858_REQ_T_GET_STATUS,
215 OTI6858_REQ_GET_STATUS,
216 0, 0,
217 new_setup, OTI6858_CTRL_PKT_SIZE,
218 100);
219
220 if (result != OTI6858_CTRL_PKT_SIZE) {
221 dev_err(&port->dev, "%s(): error reading status\n", __func__);
222 kfree(new_setup);
223
224 schedule_delayed_work(&priv->delayed_setup_work,
225 msecs_to_jiffies(2));
226 return;
227 }
228
229 spin_lock_irqsave(&priv->lock, flags);
230 if (!OTI6858_CTRL_EQUALS_PENDING(new_setup, priv)) {
231 new_setup->divisor = priv->pending_setup.divisor;
232 new_setup->control = priv->pending_setup.control;
233 new_setup->frame_fmt = priv->pending_setup.frame_fmt;
234
235 spin_unlock_irqrestore(&priv->lock, flags);
236 result = usb_control_msg(port->serial->dev,
237 usb_sndctrlpipe(port->serial->dev, 0),
238 OTI6858_REQ_T_SET_LINE,
239 OTI6858_REQ_SET_LINE,
240 0, 0,
241 new_setup, OTI6858_CTRL_PKT_SIZE,
242 100);
243 } else {
244 spin_unlock_irqrestore(&priv->lock, flags);
245 result = 0;
246 }
247 kfree(new_setup);
248
249 spin_lock_irqsave(&priv->lock, flags);
250 if (result != OTI6858_CTRL_PKT_SIZE)
251 priv->transient = 0;
252 priv->setup_done = 1;
253 spin_unlock_irqrestore(&priv->lock, flags);
254
255 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__);
256 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
257 if (result != 0) {
258 dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n",
259 __func__, result);
260 }
261}
262
263static void send_data(struct work_struct *work)
264{
265 struct oti6858_private *priv = container_of(work,
266 struct oti6858_private, delayed_write_work.work);
267 struct usb_serial_port *port = priv->port;
268 int count = 0, result;
269 unsigned long flags;
270 u8 *allow;
271
272 spin_lock_irqsave(&priv->lock, flags);
273 if (priv->flags.write_urb_in_use) {
274 spin_unlock_irqrestore(&priv->lock, flags);
275 schedule_delayed_work(&priv->delayed_write_work,
276 msecs_to_jiffies(2));
277 return;
278 }
279 priv->flags.write_urb_in_use = 1;
280 spin_unlock_irqrestore(&priv->lock, flags);
281
282 spin_lock_irqsave(&port->lock, flags);
283 count = kfifo_len(&port->write_fifo);
284 spin_unlock_irqrestore(&port->lock, flags);
285
286 if (count > port->bulk_out_size)
287 count = port->bulk_out_size;
288
289 if (count != 0) {
290 allow = kmalloc(1, GFP_KERNEL);
291 if (!allow)
292 return;
293
294 result = usb_control_msg(port->serial->dev,
295 usb_rcvctrlpipe(port->serial->dev, 0),
296 OTI6858_REQ_T_CHECK_TXBUFF,
297 OTI6858_REQ_CHECK_TXBUFF,
298 count, 0, allow, 1, 100);
299 if (result != 1 || *allow != 0)
300 count = 0;
301 kfree(allow);
302 }
303
304 if (count == 0) {
305 priv->flags.write_urb_in_use = 0;
306
307 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__);
308 result = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO);
309 if (result != 0) {
310 dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n",
311 __func__, result);
312 }
313 return;
314 }
315
316 count = kfifo_out_locked(&port->write_fifo,
317 port->write_urb->transfer_buffer,
318 count, &port->lock);
319 port->write_urb->transfer_buffer_length = count;
320 result = usb_submit_urb(port->write_urb, GFP_NOIO);
321 if (result != 0) {
322 dev_err_console(port, "%s(): usb_submit_urb() failed with error %d\n",
323 __func__, result);
324 priv->flags.write_urb_in_use = 0;
325 }
326
327 usb_serial_port_softint(port);
328}
329
330static int oti6858_port_probe(struct usb_serial_port *port)
331{
332 struct oti6858_private *priv;
333
334 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
335 if (!priv)
336 return -ENOMEM;
337
338 spin_lock_init(&priv->lock);
339 priv->port = port;
340 INIT_DELAYED_WORK(&priv->delayed_setup_work, setup_line);
341 INIT_DELAYED_WORK(&priv->delayed_write_work, send_data);
342
343 usb_set_serial_port_data(port, priv);
344
345 port->port.drain_delay = 256;
346
347 return 0;
348}
349
350static int oti6858_port_remove(struct usb_serial_port *port)
351{
352 struct oti6858_private *priv;
353
354 priv = usb_get_serial_port_data(port);
355 kfree(priv);
356
357 return 0;
358}
359
360static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port,
361 const unsigned char *buf, int count)
362{
363 if (!count)
364 return count;
365
366 count = kfifo_in_locked(&port->write_fifo, buf, count, &port->lock);
367
368 return count;
369}
370
371static int oti6858_write_room(struct tty_struct *tty)
372{
373 struct usb_serial_port *port = tty->driver_data;
374 int room = 0;
375 unsigned long flags;
376
377 spin_lock_irqsave(&port->lock, flags);
378 room = kfifo_avail(&port->write_fifo);
379 spin_unlock_irqrestore(&port->lock, flags);
380
381 return room;
382}
383
384static int oti6858_chars_in_buffer(struct tty_struct *tty)
385{
386 struct usb_serial_port *port = tty->driver_data;
387 int chars = 0;
388 unsigned long flags;
389
390 spin_lock_irqsave(&port->lock, flags);
391 chars = kfifo_len(&port->write_fifo);
392 spin_unlock_irqrestore(&port->lock, flags);
393
394 return chars;
395}
396
397static void oti6858_init_termios(struct tty_struct *tty)
398{
399 tty->termios = tty_std_termios;
400 tty->termios.c_cflag = B38400 | CS8 | CREAD | HUPCL | CLOCAL;
401 tty->termios.c_ispeed = 38400;
402 tty->termios.c_ospeed = 38400;
403}
404
405static void oti6858_set_termios(struct tty_struct *tty,
406 struct usb_serial_port *port, struct ktermios *old_termios)
407{
408 struct oti6858_private *priv = usb_get_serial_port_data(port);
409 unsigned long flags;
410 unsigned int cflag;
411 u8 frame_fmt, control;
412 __le16 divisor;
413 int br;
414
415 cflag = tty->termios.c_cflag;
416
417 spin_lock_irqsave(&priv->lock, flags);
418 divisor = priv->pending_setup.divisor;
419 frame_fmt = priv->pending_setup.frame_fmt;
420 control = priv->pending_setup.control;
421 spin_unlock_irqrestore(&priv->lock, flags);
422
423 frame_fmt &= ~FMT_DATA_BITS_MASK;
424 switch (cflag & CSIZE) {
425 case CS5:
426 frame_fmt |= FMT_DATA_BITS_5;
427 break;
428 case CS6:
429 frame_fmt |= FMT_DATA_BITS_6;
430 break;
431 case CS7:
432 frame_fmt |= FMT_DATA_BITS_7;
433 break;
434 default:
435 case CS8:
436 frame_fmt |= FMT_DATA_BITS_8;
437 break;
438 }
439
440
441
442
443
444
445 br = tty_get_baud_rate(tty);
446 if (br == 0) {
447 divisor = 0;
448 } else {
449 int real_br;
450 int new_divisor;
451 br = min(br, OTI6858_MAX_BAUD_RATE);
452
453 new_divisor = (96000000 + 8 * br) / (16 * br);
454 real_br = 96000000 / (16 * new_divisor);
455 divisor = cpu_to_le16(new_divisor);
456 tty_encode_baud_rate(tty, real_br, real_br);
457 }
458
459 frame_fmt &= ~FMT_STOP_BITS_MASK;
460 if ((cflag & CSTOPB) != 0)
461 frame_fmt |= FMT_STOP_BITS_2;
462 else
463 frame_fmt |= FMT_STOP_BITS_1;
464
465 frame_fmt &= ~FMT_PARITY_MASK;
466 if ((cflag & PARENB) != 0) {
467 if ((cflag & PARODD) != 0)
468 frame_fmt |= FMT_PARITY_ODD;
469 else
470 frame_fmt |= FMT_PARITY_EVEN;
471 } else {
472 frame_fmt |= FMT_PARITY_NONE;
473 }
474
475 control &= ~CONTROL_MASK;
476 if ((cflag & CRTSCTS) != 0)
477 control |= (CONTROL_DTR_HIGH | CONTROL_RTS_HIGH);
478
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495
496 spin_lock_irqsave(&priv->lock, flags);
497 if (divisor != priv->pending_setup.divisor
498 || control != priv->pending_setup.control
499 || frame_fmt != priv->pending_setup.frame_fmt) {
500 priv->pending_setup.divisor = divisor;
501 priv->pending_setup.control = control;
502 priv->pending_setup.frame_fmt = frame_fmt;
503 }
504 spin_unlock_irqrestore(&priv->lock, flags);
505}
506
507static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port)
508{
509 struct oti6858_private *priv = usb_get_serial_port_data(port);
510 struct usb_serial *serial = port->serial;
511 struct oti6858_control_pkt *buf;
512 unsigned long flags;
513 int result;
514
515 usb_clear_halt(serial->dev, port->write_urb->pipe);
516 usb_clear_halt(serial->dev, port->read_urb->pipe);
517
518 buf = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL);
519 if (!buf)
520 return -ENOMEM;
521
522 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
523 OTI6858_REQ_T_GET_STATUS,
524 OTI6858_REQ_GET_STATUS,
525 0, 0,
526 buf, OTI6858_CTRL_PKT_SIZE,
527 100);
528 if (result != OTI6858_CTRL_PKT_SIZE) {
529
530 buf->divisor = cpu_to_le16(0x009c);
531 buf->frame_fmt = 0x03;
532 buf->something = 0x43;
533 buf->control = 0x4c;
534 buf->tx_status = 0x00;
535 buf->pin_state = 0x5b;
536 buf->rx_bytes_avail = 0x00;
537 }
538
539 spin_lock_irqsave(&priv->lock, flags);
540 memcpy(&priv->status, buf, OTI6858_CTRL_PKT_SIZE);
541 priv->pending_setup.divisor = buf->divisor;
542 priv->pending_setup.frame_fmt = buf->frame_fmt;
543 priv->pending_setup.control = buf->control;
544 spin_unlock_irqrestore(&priv->lock, flags);
545 kfree(buf);
546
547 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__);
548 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
549 if (result != 0) {
550 dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n",
551 __func__, result);
552 oti6858_close(port);
553 return result;
554 }
555
556
557 if (tty)
558 oti6858_set_termios(tty, port, NULL);
559
560 return 0;
561}
562
563static void oti6858_close(struct usb_serial_port *port)
564{
565 struct oti6858_private *priv = usb_get_serial_port_data(port);
566 unsigned long flags;
567
568 spin_lock_irqsave(&port->lock, flags);
569
570 kfifo_reset_out(&port->write_fifo);
571 spin_unlock_irqrestore(&port->lock, flags);
572
573 dev_dbg(&port->dev, "%s(): after buf_clear()\n", __func__);
574
575
576 cancel_delayed_work_sync(&priv->delayed_setup_work);
577 cancel_delayed_work_sync(&priv->delayed_write_work);
578
579
580 dev_dbg(&port->dev, "%s(): shutting down urbs\n", __func__);
581 usb_kill_urb(port->write_urb);
582 usb_kill_urb(port->read_urb);
583 usb_kill_urb(port->interrupt_in_urb);
584}
585
586static int oti6858_tiocmset(struct tty_struct *tty,
587 unsigned int set, unsigned int clear)
588{
589 struct usb_serial_port *port = tty->driver_data;
590 struct oti6858_private *priv = usb_get_serial_port_data(port);
591 unsigned long flags;
592 u8 control;
593
594 dev_dbg(&port->dev, "%s(set = 0x%08x, clear = 0x%08x)\n",
595 __func__, set, clear);
596
597
598 spin_lock_irqsave(&priv->lock, flags);
599 control = priv->pending_setup.control;
600 if ((set & TIOCM_RTS) != 0)
601 control |= CONTROL_RTS_HIGH;
602 if ((set & TIOCM_DTR) != 0)
603 control |= CONTROL_DTR_HIGH;
604 if ((clear & TIOCM_RTS) != 0)
605 control &= ~CONTROL_RTS_HIGH;
606 if ((clear & TIOCM_DTR) != 0)
607 control &= ~CONTROL_DTR_HIGH;
608
609 if (control != priv->pending_setup.control)
610 priv->pending_setup.control = control;
611
612 spin_unlock_irqrestore(&priv->lock, flags);
613 return 0;
614}
615
616static int oti6858_tiocmget(struct tty_struct *tty)
617{
618 struct usb_serial_port *port = tty->driver_data;
619 struct oti6858_private *priv = usb_get_serial_port_data(port);
620 unsigned long flags;
621 unsigned pin_state;
622 unsigned result = 0;
623
624 spin_lock_irqsave(&priv->lock, flags);
625 pin_state = priv->status.pin_state & PIN_MASK;
626 spin_unlock_irqrestore(&priv->lock, flags);
627
628
629 if ((pin_state & PIN_RTS) != 0)
630 result |= TIOCM_RTS;
631 if ((pin_state & PIN_CTS) != 0)
632 result |= TIOCM_CTS;
633 if ((pin_state & PIN_DSR) != 0)
634 result |= TIOCM_DSR;
635 if ((pin_state & PIN_DTR) != 0)
636 result |= TIOCM_DTR;
637 if ((pin_state & PIN_RI) != 0)
638 result |= TIOCM_RI;
639 if ((pin_state & PIN_DCD) != 0)
640 result |= TIOCM_CD;
641
642 dev_dbg(&port->dev, "%s() = 0x%08x\n", __func__, result);
643
644 return result;
645}
646
647static void oti6858_read_int_callback(struct urb *urb)
648{
649 struct usb_serial_port *port = urb->context;
650 struct oti6858_private *priv = usb_get_serial_port_data(port);
651 int transient = 0, can_recv = 0, resubmit = 1;
652 int status = urb->status;
653
654 switch (status) {
655 case 0:
656
657 break;
658 case -ECONNRESET:
659 case -ENOENT:
660 case -ESHUTDOWN:
661
662 dev_dbg(&urb->dev->dev, "%s(): urb shutting down with status: %d\n",
663 __func__, status);
664 return;
665 default:
666 dev_dbg(&urb->dev->dev, "%s(): nonzero urb status received: %d\n",
667 __func__, status);
668 break;
669 }
670
671 if (status == 0 && urb->actual_length == OTI6858_CTRL_PKT_SIZE) {
672 struct oti6858_control_pkt *xs = urb->transfer_buffer;
673 unsigned long flags;
674
675 spin_lock_irqsave(&priv->lock, flags);
676
677 if (!priv->transient) {
678 if (!OTI6858_CTRL_EQUALS_PENDING(xs, priv)) {
679 if (xs->rx_bytes_avail == 0) {
680 priv->transient = 4;
681 priv->setup_done = 0;
682 resubmit = 0;
683 dev_dbg(&port->dev, "%s(): scheduling setup_line()\n", __func__);
684 schedule_delayed_work(&priv->delayed_setup_work, 0);
685 }
686 }
687 } else {
688 if (OTI6858_CTRL_EQUALS_PENDING(xs, priv)) {
689 priv->transient = 0;
690 } else if (!priv->setup_done) {
691 resubmit = 0;
692 } else if (--priv->transient == 0) {
693 if (xs->rx_bytes_avail == 0) {
694 priv->transient = 4;
695 priv->setup_done = 0;
696 resubmit = 0;
697 dev_dbg(&port->dev, "%s(): scheduling setup_line()\n", __func__);
698 schedule_delayed_work(&priv->delayed_setup_work, 0);
699 }
700 }
701 }
702
703 if (!priv->transient) {
704 u8 delta = xs->pin_state ^ priv->status.pin_state;
705
706 if (delta & PIN_MSR_MASK) {
707 if (delta & PIN_CTS)
708 port->icount.cts++;
709 if (delta & PIN_DSR)
710 port->icount.dsr++;
711 if (delta & PIN_RI)
712 port->icount.rng++;
713 if (delta & PIN_DCD)
714 port->icount.dcd++;
715
716 wake_up_interruptible(&port->port.delta_msr_wait);
717 }
718
719 memcpy(&priv->status, xs, OTI6858_CTRL_PKT_SIZE);
720 }
721
722 if (!priv->transient && xs->rx_bytes_avail != 0) {
723 can_recv = xs->rx_bytes_avail;
724 priv->flags.read_urb_in_use = 1;
725 }
726
727 transient = priv->transient;
728 spin_unlock_irqrestore(&priv->lock, flags);
729 }
730
731 if (can_recv) {
732 int result;
733
734 result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
735 if (result != 0) {
736 priv->flags.read_urb_in_use = 0;
737 dev_err(&port->dev, "%s(): usb_submit_urb() failed,"
738 " error %d\n", __func__, result);
739 } else {
740 resubmit = 0;
741 }
742 } else if (!transient) {
743 unsigned long flags;
744 int count;
745
746 spin_lock_irqsave(&port->lock, flags);
747 count = kfifo_len(&port->write_fifo);
748 spin_unlock_irqrestore(&port->lock, flags);
749
750 spin_lock_irqsave(&priv->lock, flags);
751 if (priv->flags.write_urb_in_use == 0 && count != 0) {
752 schedule_delayed_work(&priv->delayed_write_work, 0);
753 resubmit = 0;
754 }
755 spin_unlock_irqrestore(&priv->lock, flags);
756 }
757
758 if (resubmit) {
759 int result;
760
761
762 result = usb_submit_urb(urb, GFP_ATOMIC);
763 if (result != 0) {
764 dev_err(&urb->dev->dev,
765 "%s(): usb_submit_urb() failed with"
766 " error %d\n", __func__, result);
767 }
768 }
769}
770
771static void oti6858_read_bulk_callback(struct urb *urb)
772{
773 struct usb_serial_port *port = urb->context;
774 struct oti6858_private *priv = usb_get_serial_port_data(port);
775 unsigned char *data = urb->transfer_buffer;
776 unsigned long flags;
777 int status = urb->status;
778 int result;
779
780 spin_lock_irqsave(&priv->lock, flags);
781 priv->flags.read_urb_in_use = 0;
782 spin_unlock_irqrestore(&priv->lock, flags);
783
784 if (status != 0) {
785 dev_dbg(&urb->dev->dev, "%s(): unable to handle the error, exiting\n", __func__);
786 return;
787 }
788
789 if (urb->actual_length > 0) {
790 tty_insert_flip_string(&port->port, data, urb->actual_length);
791 tty_flip_buffer_push(&port->port);
792 }
793
794
795 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
796 if (result != 0 && result != -EPERM) {
797 dev_err(&port->dev, "%s(): usb_submit_urb() failed,"
798 " error %d\n", __func__, result);
799 }
800}
801
802static void oti6858_write_bulk_callback(struct urb *urb)
803{
804 struct usb_serial_port *port = urb->context;
805 struct oti6858_private *priv = usb_get_serial_port_data(port);
806 int status = urb->status;
807 int result;
808
809 switch (status) {
810 case 0:
811
812 break;
813 case -ECONNRESET:
814 case -ENOENT:
815 case -ESHUTDOWN:
816
817 dev_dbg(&urb->dev->dev, "%s(): urb shutting down with status: %d\n", __func__, status);
818 priv->flags.write_urb_in_use = 0;
819 return;
820 default:
821
822 dev_dbg(&urb->dev->dev, "%s(): nonzero write bulk status received: %d\n", __func__, status);
823 dev_dbg(&urb->dev->dev, "%s(): overflow in write\n", __func__);
824
825 port->write_urb->transfer_buffer_length = 1;
826 result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
827 if (result) {
828 dev_err_console(port, "%s(): usb_submit_urb() failed,"
829 " error %d\n", __func__, result);
830 } else {
831 return;
832 }
833 }
834
835 priv->flags.write_urb_in_use = 0;
836
837
838 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__);
839 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
840 if (result != 0) {
841 dev_err(&port->dev, "%s(): failed submitting int urb,"
842 " error %d\n", __func__, result);
843 }
844}
845
846module_usb_serial_driver(serial_drivers, id_table);
847
848MODULE_DESCRIPTION(OTI6858_DESCRIPTION);
849MODULE_AUTHOR(OTI6858_AUTHOR);
850MODULE_LICENSE("GPL");
851
