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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 .open = oti6858_open,
149 .close = oti6858_close,
150 .write = oti6858_write,
151 .set_termios = oti6858_set_termios,
152 .init_termios = oti6858_init_termios,
153 .tiocmget = oti6858_tiocmget,
154 .tiocmset = oti6858_tiocmset,
155 .tiocmiwait = usb_serial_generic_tiocmiwait,
156 .read_bulk_callback = oti6858_read_bulk_callback,
157 .read_int_callback = oti6858_read_int_callback,
158 .write_bulk_callback = oti6858_write_bulk_callback,
159 .write_room = oti6858_write_room,
160 .chars_in_buffer = oti6858_chars_in_buffer,
161 .port_probe = oti6858_port_probe,
162 .port_remove = oti6858_port_remove,
163};
164
165static struct usb_serial_driver * const serial_drivers[] = {
166 &oti6858_device, NULL
167};
168
169struct oti6858_private {
170 spinlock_t lock;
171
172 struct oti6858_control_pkt status;
173
174 struct {
175 u8 read_urb_in_use;
176 u8 write_urb_in_use;
177 } flags;
178 struct delayed_work delayed_write_work;
179
180 struct {
181 __le16 divisor;
182 u8 frame_fmt;
183 u8 control;
184 } pending_setup;
185 u8 transient;
186 u8 setup_done;
187 struct delayed_work delayed_setup_work;
188
189 struct usb_serial_port *port;
190};
191
192static void setup_line(struct work_struct *work)
193{
194 struct oti6858_private *priv = container_of(work,
195 struct oti6858_private, delayed_setup_work.work);
196 struct usb_serial_port *port = priv->port;
197 struct oti6858_control_pkt *new_setup;
198 unsigned long flags;
199 int result;
200
201 new_setup = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL);
202 if (!new_setup) {
203
204 schedule_delayed_work(&priv->delayed_setup_work,
205 msecs_to_jiffies(2));
206 return;
207 }
208
209 result = usb_control_msg(port->serial->dev,
210 usb_rcvctrlpipe(port->serial->dev, 0),
211 OTI6858_REQ_T_GET_STATUS,
212 OTI6858_REQ_GET_STATUS,
213 0, 0,
214 new_setup, OTI6858_CTRL_PKT_SIZE,
215 100);
216
217 if (result != OTI6858_CTRL_PKT_SIZE) {
218 dev_err(&port->dev, "%s(): error reading status\n", __func__);
219 kfree(new_setup);
220
221 schedule_delayed_work(&priv->delayed_setup_work,
222 msecs_to_jiffies(2));
223 return;
224 }
225
226 spin_lock_irqsave(&priv->lock, flags);
227 if (!OTI6858_CTRL_EQUALS_PENDING(new_setup, priv)) {
228 new_setup->divisor = priv->pending_setup.divisor;
229 new_setup->control = priv->pending_setup.control;
230 new_setup->frame_fmt = priv->pending_setup.frame_fmt;
231
232 spin_unlock_irqrestore(&priv->lock, flags);
233 result = usb_control_msg(port->serial->dev,
234 usb_sndctrlpipe(port->serial->dev, 0),
235 OTI6858_REQ_T_SET_LINE,
236 OTI6858_REQ_SET_LINE,
237 0, 0,
238 new_setup, OTI6858_CTRL_PKT_SIZE,
239 100);
240 } else {
241 spin_unlock_irqrestore(&priv->lock, flags);
242 result = 0;
243 }
244 kfree(new_setup);
245
246 spin_lock_irqsave(&priv->lock, flags);
247 if (result != OTI6858_CTRL_PKT_SIZE)
248 priv->transient = 0;
249 priv->setup_done = 1;
250 spin_unlock_irqrestore(&priv->lock, flags);
251
252 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__);
253 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
254 if (result != 0) {
255 dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n",
256 __func__, result);
257 }
258}
259
260static void send_data(struct work_struct *work)
261{
262 struct oti6858_private *priv = container_of(work,
263 struct oti6858_private, delayed_write_work.work);
264 struct usb_serial_port *port = priv->port;
265 int count = 0, result;
266 unsigned long flags;
267 u8 *allow;
268
269 spin_lock_irqsave(&priv->lock, flags);
270 if (priv->flags.write_urb_in_use) {
271 spin_unlock_irqrestore(&priv->lock, flags);
272 schedule_delayed_work(&priv->delayed_write_work,
273 msecs_to_jiffies(2));
274 return;
275 }
276 priv->flags.write_urb_in_use = 1;
277 spin_unlock_irqrestore(&priv->lock, flags);
278
279 spin_lock_irqsave(&port->lock, flags);
280 count = kfifo_len(&port->write_fifo);
281 spin_unlock_irqrestore(&port->lock, flags);
282
283 if (count > port->bulk_out_size)
284 count = port->bulk_out_size;
285
286 if (count != 0) {
287 allow = kmalloc(1, GFP_KERNEL);
288 if (!allow)
289 return;
290
291 result = usb_control_msg(port->serial->dev,
292 usb_rcvctrlpipe(port->serial->dev, 0),
293 OTI6858_REQ_T_CHECK_TXBUFF,
294 OTI6858_REQ_CHECK_TXBUFF,
295 count, 0, allow, 1, 100);
296 if (result != 1 || *allow != 0)
297 count = 0;
298 kfree(allow);
299 }
300
301 if (count == 0) {
302 priv->flags.write_urb_in_use = 0;
303
304 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__);
305 result = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO);
306 if (result != 0) {
307 dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n",
308 __func__, result);
309 }
310 return;
311 }
312
313 count = kfifo_out_locked(&port->write_fifo,
314 port->write_urb->transfer_buffer,
315 count, &port->lock);
316 port->write_urb->transfer_buffer_length = count;
317 result = usb_submit_urb(port->write_urb, GFP_NOIO);
318 if (result != 0) {
319 dev_err_console(port, "%s(): usb_submit_urb() failed with error %d\n",
320 __func__, result);
321 priv->flags.write_urb_in_use = 0;
322 }
323
324 usb_serial_port_softint(port);
325}
326
327static int oti6858_port_probe(struct usb_serial_port *port)
328{
329 struct oti6858_private *priv;
330
331 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
332 if (!priv)
333 return -ENOMEM;
334
335 spin_lock_init(&priv->lock);
336 priv->port = port;
337 INIT_DELAYED_WORK(&priv->delayed_setup_work, setup_line);
338 INIT_DELAYED_WORK(&priv->delayed_write_work, send_data);
339
340 usb_set_serial_port_data(port, priv);
341
342 port->port.drain_delay = 256;
343
344 return 0;
345}
346
347static int oti6858_port_remove(struct usb_serial_port *port)
348{
349 struct oti6858_private *priv;
350
351 priv = usb_get_serial_port_data(port);
352 kfree(priv);
353
354 return 0;
355}
356
357static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port,
358 const unsigned char *buf, int count)
359{
360 if (!count)
361 return count;
362
363 count = kfifo_in_locked(&port->write_fifo, buf, count, &port->lock);
364
365 return count;
366}
367
368static int oti6858_write_room(struct tty_struct *tty)
369{
370 struct usb_serial_port *port = tty->driver_data;
371 int room = 0;
372 unsigned long flags;
373
374 spin_lock_irqsave(&port->lock, flags);
375 room = kfifo_avail(&port->write_fifo);
376 spin_unlock_irqrestore(&port->lock, flags);
377
378 return room;
379}
380
381static int oti6858_chars_in_buffer(struct tty_struct *tty)
382{
383 struct usb_serial_port *port = tty->driver_data;
384 int chars = 0;
385 unsigned long flags;
386
387 spin_lock_irqsave(&port->lock, flags);
388 chars = kfifo_len(&port->write_fifo);
389 spin_unlock_irqrestore(&port->lock, flags);
390
391 return chars;
392}
393
394static void oti6858_init_termios(struct tty_struct *tty)
395{
396 tty->termios = tty_std_termios;
397 tty->termios.c_cflag = B38400 | CS8 | CREAD | HUPCL | CLOCAL;
398 tty->termios.c_ispeed = 38400;
399 tty->termios.c_ospeed = 38400;
400}
401
402static void oti6858_set_termios(struct tty_struct *tty,
403 struct usb_serial_port *port, struct ktermios *old_termios)
404{
405 struct oti6858_private *priv = usb_get_serial_port_data(port);
406 unsigned long flags;
407 unsigned int cflag;
408 u8 frame_fmt, control;
409 __le16 divisor;
410 int br;
411
412 cflag = tty->termios.c_cflag;
413
414 spin_lock_irqsave(&priv->lock, flags);
415 divisor = priv->pending_setup.divisor;
416 frame_fmt = priv->pending_setup.frame_fmt;
417 control = priv->pending_setup.control;
418 spin_unlock_irqrestore(&priv->lock, flags);
419
420 frame_fmt &= ~FMT_DATA_BITS_MASK;
421 switch (cflag & CSIZE) {
422 case CS5:
423 frame_fmt |= FMT_DATA_BITS_5;
424 break;
425 case CS6:
426 frame_fmt |= FMT_DATA_BITS_6;
427 break;
428 case CS7:
429 frame_fmt |= FMT_DATA_BITS_7;
430 break;
431 default:
432 case CS8:
433 frame_fmt |= FMT_DATA_BITS_8;
434 break;
435 }
436
437
438
439
440
441
442 br = tty_get_baud_rate(tty);
443 if (br == 0) {
444 divisor = 0;
445 } else {
446 int real_br;
447 int new_divisor;
448 br = min(br, OTI6858_MAX_BAUD_RATE);
449
450 new_divisor = (96000000 + 8 * br) / (16 * br);
451 real_br = 96000000 / (16 * new_divisor);
452 divisor = cpu_to_le16(new_divisor);
453 tty_encode_baud_rate(tty, real_br, real_br);
454 }
455
456 frame_fmt &= ~FMT_STOP_BITS_MASK;
457 if ((cflag & CSTOPB) != 0)
458 frame_fmt |= FMT_STOP_BITS_2;
459 else
460 frame_fmt |= FMT_STOP_BITS_1;
461
462 frame_fmt &= ~FMT_PARITY_MASK;
463 if ((cflag & PARENB) != 0) {
464 if ((cflag & PARODD) != 0)
465 frame_fmt |= FMT_PARITY_ODD;
466 else
467 frame_fmt |= FMT_PARITY_EVEN;
468 } else {
469 frame_fmt |= FMT_PARITY_NONE;
470 }
471
472 control &= ~CONTROL_MASK;
473 if ((cflag & CRTSCTS) != 0)
474 control |= (CONTROL_DTR_HIGH | CONTROL_RTS_HIGH);
475
476
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492
493 spin_lock_irqsave(&priv->lock, flags);
494 if (divisor != priv->pending_setup.divisor
495 || control != priv->pending_setup.control
496 || frame_fmt != priv->pending_setup.frame_fmt) {
497 priv->pending_setup.divisor = divisor;
498 priv->pending_setup.control = control;
499 priv->pending_setup.frame_fmt = frame_fmt;
500 }
501 spin_unlock_irqrestore(&priv->lock, flags);
502}
503
504static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port)
505{
506 struct oti6858_private *priv = usb_get_serial_port_data(port);
507 struct usb_serial *serial = port->serial;
508 struct oti6858_control_pkt *buf;
509 unsigned long flags;
510 int result;
511
512 usb_clear_halt(serial->dev, port->write_urb->pipe);
513 usb_clear_halt(serial->dev, port->read_urb->pipe);
514
515 buf = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL);
516 if (!buf)
517 return -ENOMEM;
518
519 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
520 OTI6858_REQ_T_GET_STATUS,
521 OTI6858_REQ_GET_STATUS,
522 0, 0,
523 buf, OTI6858_CTRL_PKT_SIZE,
524 100);
525 if (result != OTI6858_CTRL_PKT_SIZE) {
526
527 buf->divisor = cpu_to_le16(0x009c);
528 buf->frame_fmt = 0x03;
529 buf->something = 0x43;
530 buf->control = 0x4c;
531 buf->tx_status = 0x00;
532 buf->pin_state = 0x5b;
533 buf->rx_bytes_avail = 0x00;
534 }
535
536 spin_lock_irqsave(&priv->lock, flags);
537 memcpy(&priv->status, buf, OTI6858_CTRL_PKT_SIZE);
538 priv->pending_setup.divisor = buf->divisor;
539 priv->pending_setup.frame_fmt = buf->frame_fmt;
540 priv->pending_setup.control = buf->control;
541 spin_unlock_irqrestore(&priv->lock, flags);
542 kfree(buf);
543
544 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__);
545 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
546 if (result != 0) {
547 dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n",
548 __func__, result);
549 oti6858_close(port);
550 return result;
551 }
552
553
554 if (tty)
555 oti6858_set_termios(tty, port, NULL);
556
557 return 0;
558}
559
560static void oti6858_close(struct usb_serial_port *port)
561{
562 struct oti6858_private *priv = usb_get_serial_port_data(port);
563 unsigned long flags;
564
565 spin_lock_irqsave(&port->lock, flags);
566
567 kfifo_reset_out(&port->write_fifo);
568 spin_unlock_irqrestore(&port->lock, flags);
569
570 dev_dbg(&port->dev, "%s(): after buf_clear()\n", __func__);
571
572
573 cancel_delayed_work_sync(&priv->delayed_setup_work);
574 cancel_delayed_work_sync(&priv->delayed_write_work);
575
576
577 dev_dbg(&port->dev, "%s(): shutting down urbs\n", __func__);
578 usb_kill_urb(port->write_urb);
579 usb_kill_urb(port->read_urb);
580 usb_kill_urb(port->interrupt_in_urb);
581}
582
583static int oti6858_tiocmset(struct tty_struct *tty,
584 unsigned int set, unsigned int clear)
585{
586 struct usb_serial_port *port = tty->driver_data;
587 struct oti6858_private *priv = usb_get_serial_port_data(port);
588 unsigned long flags;
589 u8 control;
590
591 dev_dbg(&port->dev, "%s(set = 0x%08x, clear = 0x%08x)\n",
592 __func__, set, clear);
593
594
595 spin_lock_irqsave(&priv->lock, flags);
596 control = priv->pending_setup.control;
597 if ((set & TIOCM_RTS) != 0)
598 control |= CONTROL_RTS_HIGH;
599 if ((set & TIOCM_DTR) != 0)
600 control |= CONTROL_DTR_HIGH;
601 if ((clear & TIOCM_RTS) != 0)
602 control &= ~CONTROL_RTS_HIGH;
603 if ((clear & TIOCM_DTR) != 0)
604 control &= ~CONTROL_DTR_HIGH;
605
606 if (control != priv->pending_setup.control)
607 priv->pending_setup.control = control;
608
609 spin_unlock_irqrestore(&priv->lock, flags);
610 return 0;
611}
612
613static int oti6858_tiocmget(struct tty_struct *tty)
614{
615 struct usb_serial_port *port = tty->driver_data;
616 struct oti6858_private *priv = usb_get_serial_port_data(port);
617 unsigned long flags;
618 unsigned pin_state;
619 unsigned result = 0;
620
621 spin_lock_irqsave(&priv->lock, flags);
622 pin_state = priv->status.pin_state & PIN_MASK;
623 spin_unlock_irqrestore(&priv->lock, flags);
624
625
626 if ((pin_state & PIN_RTS) != 0)
627 result |= TIOCM_RTS;
628 if ((pin_state & PIN_CTS) != 0)
629 result |= TIOCM_CTS;
630 if ((pin_state & PIN_DSR) != 0)
631 result |= TIOCM_DSR;
632 if ((pin_state & PIN_DTR) != 0)
633 result |= TIOCM_DTR;
634 if ((pin_state & PIN_RI) != 0)
635 result |= TIOCM_RI;
636 if ((pin_state & PIN_DCD) != 0)
637 result |= TIOCM_CD;
638
639 dev_dbg(&port->dev, "%s() = 0x%08x\n", __func__, result);
640
641 return result;
642}
643
644static void oti6858_read_int_callback(struct urb *urb)
645{
646 struct usb_serial_port *port = urb->context;
647 struct oti6858_private *priv = usb_get_serial_port_data(port);
648 int transient = 0, can_recv = 0, resubmit = 1;
649 int status = urb->status;
650
651 switch (status) {
652 case 0:
653
654 break;
655 case -ECONNRESET:
656 case -ENOENT:
657 case -ESHUTDOWN:
658
659 dev_dbg(&urb->dev->dev, "%s(): urb shutting down with status: %d\n",
660 __func__, status);
661 return;
662 default:
663 dev_dbg(&urb->dev->dev, "%s(): nonzero urb status received: %d\n",
664 __func__, status);
665 break;
666 }
667
668 if (status == 0 && urb->actual_length == OTI6858_CTRL_PKT_SIZE) {
669 struct oti6858_control_pkt *xs = urb->transfer_buffer;
670 unsigned long flags;
671
672 spin_lock_irqsave(&priv->lock, flags);
673
674 if (!priv->transient) {
675 if (!OTI6858_CTRL_EQUALS_PENDING(xs, priv)) {
676 if (xs->rx_bytes_avail == 0) {
677 priv->transient = 4;
678 priv->setup_done = 0;
679 resubmit = 0;
680 dev_dbg(&port->dev, "%s(): scheduling setup_line()\n", __func__);
681 schedule_delayed_work(&priv->delayed_setup_work, 0);
682 }
683 }
684 } else {
685 if (OTI6858_CTRL_EQUALS_PENDING(xs, priv)) {
686 priv->transient = 0;
687 } else if (!priv->setup_done) {
688 resubmit = 0;
689 } else if (--priv->transient == 0) {
690 if (xs->rx_bytes_avail == 0) {
691 priv->transient = 4;
692 priv->setup_done = 0;
693 resubmit = 0;
694 dev_dbg(&port->dev, "%s(): scheduling setup_line()\n", __func__);
695 schedule_delayed_work(&priv->delayed_setup_work, 0);
696 }
697 }
698 }
699
700 if (!priv->transient) {
701 u8 delta = xs->pin_state ^ priv->status.pin_state;
702
703 if (delta & PIN_MSR_MASK) {
704 if (delta & PIN_CTS)
705 port->icount.cts++;
706 if (delta & PIN_DSR)
707 port->icount.dsr++;
708 if (delta & PIN_RI)
709 port->icount.rng++;
710 if (delta & PIN_DCD)
711 port->icount.dcd++;
712
713 wake_up_interruptible(&port->port.delta_msr_wait);
714 }
715
716 memcpy(&priv->status, xs, OTI6858_CTRL_PKT_SIZE);
717 }
718
719 if (!priv->transient && xs->rx_bytes_avail != 0) {
720 can_recv = xs->rx_bytes_avail;
721 priv->flags.read_urb_in_use = 1;
722 }
723
724 transient = priv->transient;
725 spin_unlock_irqrestore(&priv->lock, flags);
726 }
727
728 if (can_recv) {
729 int result;
730
731 result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
732 if (result != 0) {
733 priv->flags.read_urb_in_use = 0;
734 dev_err(&port->dev, "%s(): usb_submit_urb() failed,"
735 " error %d\n", __func__, result);
736 } else {
737 resubmit = 0;
738 }
739 } else if (!transient) {
740 unsigned long flags;
741 int count;
742
743 spin_lock_irqsave(&port->lock, flags);
744 count = kfifo_len(&port->write_fifo);
745 spin_unlock_irqrestore(&port->lock, flags);
746
747 spin_lock_irqsave(&priv->lock, flags);
748 if (priv->flags.write_urb_in_use == 0 && count != 0) {
749 schedule_delayed_work(&priv->delayed_write_work, 0);
750 resubmit = 0;
751 }
752 spin_unlock_irqrestore(&priv->lock, flags);
753 }
754
755 if (resubmit) {
756 int result;
757
758
759 result = usb_submit_urb(urb, GFP_ATOMIC);
760 if (result != 0) {
761 dev_err(&urb->dev->dev,
762 "%s(): usb_submit_urb() failed with"
763 " error %d\n", __func__, result);
764 }
765 }
766}
767
768static void oti6858_read_bulk_callback(struct urb *urb)
769{
770 struct usb_serial_port *port = urb->context;
771 struct oti6858_private *priv = usb_get_serial_port_data(port);
772 unsigned char *data = urb->transfer_buffer;
773 unsigned long flags;
774 int status = urb->status;
775 int result;
776
777 spin_lock_irqsave(&priv->lock, flags);
778 priv->flags.read_urb_in_use = 0;
779 spin_unlock_irqrestore(&priv->lock, flags);
780
781 if (status != 0) {
782 dev_dbg(&urb->dev->dev, "%s(): unable to handle the error, exiting\n", __func__);
783 return;
784 }
785
786 if (urb->actual_length > 0) {
787 tty_insert_flip_string(&port->port, data, urb->actual_length);
788 tty_flip_buffer_push(&port->port);
789 }
790
791
792 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
793 if (result != 0 && result != -EPERM) {
794 dev_err(&port->dev, "%s(): usb_submit_urb() failed,"
795 " error %d\n", __func__, result);
796 }
797}
798
799static void oti6858_write_bulk_callback(struct urb *urb)
800{
801 struct usb_serial_port *port = urb->context;
802 struct oti6858_private *priv = usb_get_serial_port_data(port);
803 int status = urb->status;
804 int result;
805
806 switch (status) {
807 case 0:
808
809 break;
810 case -ECONNRESET:
811 case -ENOENT:
812 case -ESHUTDOWN:
813
814 dev_dbg(&urb->dev->dev, "%s(): urb shutting down with status: %d\n", __func__, status);
815 priv->flags.write_urb_in_use = 0;
816 return;
817 default:
818
819 dev_dbg(&urb->dev->dev, "%s(): nonzero write bulk status received: %d\n", __func__, status);
820 dev_dbg(&urb->dev->dev, "%s(): overflow in write\n", __func__);
821
822 port->write_urb->transfer_buffer_length = 1;
823 result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
824 if (result) {
825 dev_err_console(port, "%s(): usb_submit_urb() failed,"
826 " error %d\n", __func__, result);
827 } else {
828 return;
829 }
830 }
831
832 priv->flags.write_urb_in_use = 0;
833
834
835 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__);
836 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
837 if (result != 0) {
838 dev_err(&port->dev, "%s(): failed submitting int urb,"
839 " error %d\n", __func__, result);
840 }
841}
842
843module_usb_serial_driver(serial_drivers, id_table);
844
845MODULE_DESCRIPTION(OTI6858_DESCRIPTION);
846MODULE_AUTHOR(OTI6858_AUTHOR);
847MODULE_LICENSE("GPL");
848
