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37#include <linux/kernel.h>
38#include <linux/errno.h>
39#include <linux/slab.h>
40#include <linux/tty.h>
41#include <linux/tty_driver.h>
42#include <linux/tty_flip.h>
43#include <linux/serial.h>
44#include <linux/module.h>
45#include <linux/moduleparam.h>
46#include <linux/spinlock.h>
47#include <linux/usb.h>
48#include <linux/usb/serial.h>
49#include <linux/uaccess.h>
50#include <linux/kfifo.h>
51#include "oti6858.h"
52
53#define OTI6858_DESCRIPTION \
54 "Ours Technology Inc. OTi-6858 USB to serial adapter driver"
55#define OTI6858_AUTHOR "Tomasz Michal Lukaszewski <FIXME@FIXME>"
56
57static const struct usb_device_id id_table[] = {
58 { USB_DEVICE(OTI6858_VENDOR_ID, OTI6858_PRODUCT_ID) },
59 { }
60};
61
62MODULE_DEVICE_TABLE(usb, id_table);
63
64
65#define OTI6858_REQ_GET_STATUS (USB_DIR_IN | USB_TYPE_VENDOR | 0x00)
66#define OTI6858_REQ_T_GET_STATUS 0x01
67
68#define OTI6858_REQ_SET_LINE (USB_DIR_OUT | USB_TYPE_VENDOR | 0x00)
69#define OTI6858_REQ_T_SET_LINE 0x00
70
71#define OTI6858_REQ_CHECK_TXBUFF (USB_DIR_IN | USB_TYPE_VENDOR | 0x01)
72#define OTI6858_REQ_T_CHECK_TXBUFF 0x00
73
74
75struct oti6858_control_pkt {
76 __le16 divisor;
77#define OTI6858_MAX_BAUD_RATE 3000000
78 u8 frame_fmt;
79#define FMT_STOP_BITS_MASK 0xc0
80#define FMT_STOP_BITS_1 0x00
81#define FMT_STOP_BITS_2 0x40
82#define FMT_PARITY_MASK 0x38
83#define FMT_PARITY_NONE 0x00
84#define FMT_PARITY_ODD 0x08
85#define FMT_PARITY_EVEN 0x18
86#define FMT_PARITY_MARK 0x28
87#define FMT_PARITY_SPACE 0x38
88#define FMT_DATA_BITS_MASK 0x03
89#define FMT_DATA_BITS_5 0x00
90#define FMT_DATA_BITS_6 0x01
91#define FMT_DATA_BITS_7 0x02
92#define FMT_DATA_BITS_8 0x03
93 u8 something;
94 u8 control;
95#define CONTROL_MASK 0x0c
96#define CONTROL_DTR_HIGH 0x08
97#define CONTROL_RTS_HIGH 0x04
98 u8 tx_status;
99#define TX_BUFFER_EMPTIED 0x09
100 u8 pin_state;
101#define PIN_MASK 0x3f
102#define PIN_MSR_MASK 0x1b
103#define PIN_RTS 0x20
104#define PIN_CTS 0x10
105#define PIN_DSR 0x08
106#define PIN_DTR 0x04
107#define PIN_RI 0x02
108#define PIN_DCD 0x01
109 u8 rx_bytes_avail; ;
110};
111
112#define OTI6858_CTRL_PKT_SIZE sizeof(struct oti6858_control_pkt)
113#define OTI6858_CTRL_EQUALS_PENDING(a, priv) \
114 (((a)->divisor == (priv)->pending_setup.divisor) \
115 && ((a)->control == (priv)->pending_setup.control) \
116 && ((a)->frame_fmt == (priv)->pending_setup.frame_fmt))
117
118
119static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port);
120static void oti6858_close(struct usb_serial_port *port);
121static void oti6858_set_termios(struct tty_struct *tty,
122 struct usb_serial_port *port, struct ktermios *old);
123static void oti6858_init_termios(struct tty_struct *tty);
124static void oti6858_read_int_callback(struct urb *urb);
125static void oti6858_read_bulk_callback(struct urb *urb);
126static void oti6858_write_bulk_callback(struct urb *urb);
127static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port,
128 const unsigned char *buf, int count);
129static int oti6858_write_room(struct tty_struct *tty);
130static int oti6858_chars_in_buffer(struct tty_struct *tty);
131static int oti6858_tiocmget(struct tty_struct *tty);
132static int oti6858_tiocmset(struct tty_struct *tty,
133 unsigned int set, unsigned int clear);
134static int oti6858_port_probe(struct usb_serial_port *port);
135static void oti6858_port_remove(struct usb_serial_port *port);
136
137
138static struct usb_serial_driver oti6858_device = {
139 .driver = {
140 .owner = THIS_MODULE,
141 .name = "oti6858",
142 },
143 .id_table = id_table,
144 .num_ports = 1,
145 .num_bulk_in = 1,
146 .num_bulk_out = 1,
147 .num_interrupt_in = 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 void 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
355static int oti6858_write(struct tty_struct *tty, struct usb_serial_port *port,
356 const unsigned char *buf, int count)
357{
358 if (!count)
359 return count;
360
361 count = kfifo_in_locked(&port->write_fifo, buf, count, &port->lock);
362
363 return count;
364}
365
366static int oti6858_write_room(struct tty_struct *tty)
367{
368 struct usb_serial_port *port = tty->driver_data;
369 int room = 0;
370 unsigned long flags;
371
372 spin_lock_irqsave(&port->lock, flags);
373 room = kfifo_avail(&port->write_fifo);
374 spin_unlock_irqrestore(&port->lock, flags);
375
376 return room;
377}
378
379static int oti6858_chars_in_buffer(struct tty_struct *tty)
380{
381 struct usb_serial_port *port = tty->driver_data;
382 int chars = 0;
383 unsigned long flags;
384
385 spin_lock_irqsave(&port->lock, flags);
386 chars = kfifo_len(&port->write_fifo);
387 spin_unlock_irqrestore(&port->lock, flags);
388
389 return chars;
390}
391
392static void oti6858_init_termios(struct tty_struct *tty)
393{
394 tty_encode_baud_rate(tty, 38400, 38400);
395}
396
397static void oti6858_set_termios(struct tty_struct *tty,
398 struct usb_serial_port *port, struct ktermios *old_termios)
399{
400 struct oti6858_private *priv = usb_get_serial_port_data(port);
401 unsigned long flags;
402 unsigned int cflag;
403 u8 frame_fmt, control;
404 __le16 divisor;
405 int br;
406
407 cflag = tty->termios.c_cflag;
408
409 spin_lock_irqsave(&priv->lock, flags);
410 divisor = priv->pending_setup.divisor;
411 frame_fmt = priv->pending_setup.frame_fmt;
412 control = priv->pending_setup.control;
413 spin_unlock_irqrestore(&priv->lock, flags);
414
415 frame_fmt &= ~FMT_DATA_BITS_MASK;
416 switch (cflag & CSIZE) {
417 case CS5:
418 frame_fmt |= FMT_DATA_BITS_5;
419 break;
420 case CS6:
421 frame_fmt |= FMT_DATA_BITS_6;
422 break;
423 case CS7:
424 frame_fmt |= FMT_DATA_BITS_7;
425 break;
426 default:
427 case CS8:
428 frame_fmt |= FMT_DATA_BITS_8;
429 break;
430 }
431
432
433
434
435
436
437 br = tty_get_baud_rate(tty);
438 if (br == 0) {
439 divisor = 0;
440 } else {
441 int real_br;
442 int new_divisor;
443 br = min(br, OTI6858_MAX_BAUD_RATE);
444
445 new_divisor = (96000000 + 8 * br) / (16 * br);
446 real_br = 96000000 / (16 * new_divisor);
447 divisor = cpu_to_le16(new_divisor);
448 tty_encode_baud_rate(tty, real_br, real_br);
449 }
450
451 frame_fmt &= ~FMT_STOP_BITS_MASK;
452 if ((cflag & CSTOPB) != 0)
453 frame_fmt |= FMT_STOP_BITS_2;
454 else
455 frame_fmt |= FMT_STOP_BITS_1;
456
457 frame_fmt &= ~FMT_PARITY_MASK;
458 if ((cflag & PARENB) != 0) {
459 if ((cflag & PARODD) != 0)
460 frame_fmt |= FMT_PARITY_ODD;
461 else
462 frame_fmt |= FMT_PARITY_EVEN;
463 } else {
464 frame_fmt |= FMT_PARITY_NONE;
465 }
466
467 control &= ~CONTROL_MASK;
468 if ((cflag & CRTSCTS) != 0)
469 control |= (CONTROL_DTR_HIGH | CONTROL_RTS_HIGH);
470
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485
486
487
488 spin_lock_irqsave(&priv->lock, flags);
489 if (divisor != priv->pending_setup.divisor
490 || control != priv->pending_setup.control
491 || frame_fmt != priv->pending_setup.frame_fmt) {
492 priv->pending_setup.divisor = divisor;
493 priv->pending_setup.control = control;
494 priv->pending_setup.frame_fmt = frame_fmt;
495 }
496 spin_unlock_irqrestore(&priv->lock, flags);
497}
498
499static int oti6858_open(struct tty_struct *tty, struct usb_serial_port *port)
500{
501 struct oti6858_private *priv = usb_get_serial_port_data(port);
502 struct usb_serial *serial = port->serial;
503 struct oti6858_control_pkt *buf;
504 unsigned long flags;
505 int result;
506
507 usb_clear_halt(serial->dev, port->write_urb->pipe);
508 usb_clear_halt(serial->dev, port->read_urb->pipe);
509
510 buf = kmalloc(OTI6858_CTRL_PKT_SIZE, GFP_KERNEL);
511 if (!buf)
512 return -ENOMEM;
513
514 result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
515 OTI6858_REQ_T_GET_STATUS,
516 OTI6858_REQ_GET_STATUS,
517 0, 0,
518 buf, OTI6858_CTRL_PKT_SIZE,
519 100);
520 if (result != OTI6858_CTRL_PKT_SIZE) {
521
522 buf->divisor = cpu_to_le16(0x009c);
523 buf->frame_fmt = 0x03;
524 buf->something = 0x43;
525 buf->control = 0x4c;
526 buf->tx_status = 0x00;
527 buf->pin_state = 0x5b;
528 buf->rx_bytes_avail = 0x00;
529 }
530
531 spin_lock_irqsave(&priv->lock, flags);
532 memcpy(&priv->status, buf, OTI6858_CTRL_PKT_SIZE);
533 priv->pending_setup.divisor = buf->divisor;
534 priv->pending_setup.frame_fmt = buf->frame_fmt;
535 priv->pending_setup.control = buf->control;
536 spin_unlock_irqrestore(&priv->lock, flags);
537 kfree(buf);
538
539 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__);
540 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
541 if (result != 0) {
542 dev_err(&port->dev, "%s(): usb_submit_urb() failed with error %d\n",
543 __func__, result);
544 oti6858_close(port);
545 return result;
546 }
547
548
549 if (tty)
550 oti6858_set_termios(tty, port, NULL);
551
552 return 0;
553}
554
555static void oti6858_close(struct usb_serial_port *port)
556{
557 struct oti6858_private *priv = usb_get_serial_port_data(port);
558 unsigned long flags;
559
560 spin_lock_irqsave(&port->lock, flags);
561
562 kfifo_reset_out(&port->write_fifo);
563 spin_unlock_irqrestore(&port->lock, flags);
564
565 dev_dbg(&port->dev, "%s(): after buf_clear()\n", __func__);
566
567
568 cancel_delayed_work_sync(&priv->delayed_setup_work);
569 cancel_delayed_work_sync(&priv->delayed_write_work);
570
571
572 dev_dbg(&port->dev, "%s(): shutting down urbs\n", __func__);
573 usb_kill_urb(port->write_urb);
574 usb_kill_urb(port->read_urb);
575 usb_kill_urb(port->interrupt_in_urb);
576}
577
578static int oti6858_tiocmset(struct tty_struct *tty,
579 unsigned int set, unsigned int clear)
580{
581 struct usb_serial_port *port = tty->driver_data;
582 struct oti6858_private *priv = usb_get_serial_port_data(port);
583 unsigned long flags;
584 u8 control;
585
586 dev_dbg(&port->dev, "%s(set = 0x%08x, clear = 0x%08x)\n",
587 __func__, set, clear);
588
589
590 spin_lock_irqsave(&priv->lock, flags);
591 control = priv->pending_setup.control;
592 if ((set & TIOCM_RTS) != 0)
593 control |= CONTROL_RTS_HIGH;
594 if ((set & TIOCM_DTR) != 0)
595 control |= CONTROL_DTR_HIGH;
596 if ((clear & TIOCM_RTS) != 0)
597 control &= ~CONTROL_RTS_HIGH;
598 if ((clear & TIOCM_DTR) != 0)
599 control &= ~CONTROL_DTR_HIGH;
600
601 if (control != priv->pending_setup.control)
602 priv->pending_setup.control = control;
603
604 spin_unlock_irqrestore(&priv->lock, flags);
605 return 0;
606}
607
608static int oti6858_tiocmget(struct tty_struct *tty)
609{
610 struct usb_serial_port *port = tty->driver_data;
611 struct oti6858_private *priv = usb_get_serial_port_data(port);
612 unsigned long flags;
613 unsigned pin_state;
614 unsigned result = 0;
615
616 spin_lock_irqsave(&priv->lock, flags);
617 pin_state = priv->status.pin_state & PIN_MASK;
618 spin_unlock_irqrestore(&priv->lock, flags);
619
620
621 if ((pin_state & PIN_RTS) != 0)
622 result |= TIOCM_RTS;
623 if ((pin_state & PIN_CTS) != 0)
624 result |= TIOCM_CTS;
625 if ((pin_state & PIN_DSR) != 0)
626 result |= TIOCM_DSR;
627 if ((pin_state & PIN_DTR) != 0)
628 result |= TIOCM_DTR;
629 if ((pin_state & PIN_RI) != 0)
630 result |= TIOCM_RI;
631 if ((pin_state & PIN_DCD) != 0)
632 result |= TIOCM_CD;
633
634 dev_dbg(&port->dev, "%s() = 0x%08x\n", __func__, result);
635
636 return result;
637}
638
639static void oti6858_read_int_callback(struct urb *urb)
640{
641 struct usb_serial_port *port = urb->context;
642 struct oti6858_private *priv = usb_get_serial_port_data(port);
643 int transient = 0, can_recv = 0, resubmit = 1;
644 int status = urb->status;
645
646 switch (status) {
647 case 0:
648
649 break;
650 case -ECONNRESET:
651 case -ENOENT:
652 case -ESHUTDOWN:
653
654 dev_dbg(&urb->dev->dev, "%s(): urb shutting down with status: %d\n",
655 __func__, status);
656 return;
657 default:
658 dev_dbg(&urb->dev->dev, "%s(): nonzero urb status received: %d\n",
659 __func__, status);
660 break;
661 }
662
663 if (status == 0 && urb->actual_length == OTI6858_CTRL_PKT_SIZE) {
664 struct oti6858_control_pkt *xs = urb->transfer_buffer;
665 unsigned long flags;
666
667 spin_lock_irqsave(&priv->lock, flags);
668
669 if (!priv->transient) {
670 if (!OTI6858_CTRL_EQUALS_PENDING(xs, priv)) {
671 if (xs->rx_bytes_avail == 0) {
672 priv->transient = 4;
673 priv->setup_done = 0;
674 resubmit = 0;
675 dev_dbg(&port->dev, "%s(): scheduling setup_line()\n", __func__);
676 schedule_delayed_work(&priv->delayed_setup_work, 0);
677 }
678 }
679 } else {
680 if (OTI6858_CTRL_EQUALS_PENDING(xs, priv)) {
681 priv->transient = 0;
682 } else if (!priv->setup_done) {
683 resubmit = 0;
684 } else if (--priv->transient == 0) {
685 if (xs->rx_bytes_avail == 0) {
686 priv->transient = 4;
687 priv->setup_done = 0;
688 resubmit = 0;
689 dev_dbg(&port->dev, "%s(): scheduling setup_line()\n", __func__);
690 schedule_delayed_work(&priv->delayed_setup_work, 0);
691 }
692 }
693 }
694
695 if (!priv->transient) {
696 u8 delta = xs->pin_state ^ priv->status.pin_state;
697
698 if (delta & PIN_MSR_MASK) {
699 if (delta & PIN_CTS)
700 port->icount.cts++;
701 if (delta & PIN_DSR)
702 port->icount.dsr++;
703 if (delta & PIN_RI)
704 port->icount.rng++;
705 if (delta & PIN_DCD)
706 port->icount.dcd++;
707
708 wake_up_interruptible(&port->port.delta_msr_wait);
709 }
710
711 memcpy(&priv->status, xs, OTI6858_CTRL_PKT_SIZE);
712 }
713
714 if (!priv->transient && xs->rx_bytes_avail != 0) {
715 can_recv = xs->rx_bytes_avail;
716 priv->flags.read_urb_in_use = 1;
717 }
718
719 transient = priv->transient;
720 spin_unlock_irqrestore(&priv->lock, flags);
721 }
722
723 if (can_recv) {
724 int result;
725
726 result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
727 if (result != 0) {
728 priv->flags.read_urb_in_use = 0;
729 dev_err(&port->dev, "%s(): usb_submit_urb() failed,"
730 " error %d\n", __func__, result);
731 } else {
732 resubmit = 0;
733 }
734 } else if (!transient) {
735 unsigned long flags;
736 int count;
737
738 spin_lock_irqsave(&port->lock, flags);
739 count = kfifo_len(&port->write_fifo);
740 spin_unlock_irqrestore(&port->lock, flags);
741
742 spin_lock_irqsave(&priv->lock, flags);
743 if (priv->flags.write_urb_in_use == 0 && count != 0) {
744 schedule_delayed_work(&priv->delayed_write_work, 0);
745 resubmit = 0;
746 }
747 spin_unlock_irqrestore(&priv->lock, flags);
748 }
749
750 if (resubmit) {
751 int result;
752
753
754 result = usb_submit_urb(urb, GFP_ATOMIC);
755 if (result != 0) {
756 dev_err(&urb->dev->dev,
757 "%s(): usb_submit_urb() failed with"
758 " error %d\n", __func__, result);
759 }
760 }
761}
762
763static void oti6858_read_bulk_callback(struct urb *urb)
764{
765 struct usb_serial_port *port = urb->context;
766 struct oti6858_private *priv = usb_get_serial_port_data(port);
767 unsigned char *data = urb->transfer_buffer;
768 unsigned long flags;
769 int status = urb->status;
770 int result;
771
772 spin_lock_irqsave(&priv->lock, flags);
773 priv->flags.read_urb_in_use = 0;
774 spin_unlock_irqrestore(&priv->lock, flags);
775
776 if (status != 0) {
777 dev_dbg(&urb->dev->dev, "%s(): unable to handle the error, exiting\n", __func__);
778 return;
779 }
780
781 if (urb->actual_length > 0) {
782 tty_insert_flip_string(&port->port, data, urb->actual_length);
783 tty_flip_buffer_push(&port->port);
784 }
785
786
787 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
788 if (result != 0 && result != -EPERM) {
789 dev_err(&port->dev, "%s(): usb_submit_urb() failed,"
790 " error %d\n", __func__, result);
791 }
792}
793
794static void oti6858_write_bulk_callback(struct urb *urb)
795{
796 struct usb_serial_port *port = urb->context;
797 struct oti6858_private *priv = usb_get_serial_port_data(port);
798 int status = urb->status;
799 int result;
800
801 switch (status) {
802 case 0:
803
804 break;
805 case -ECONNRESET:
806 case -ENOENT:
807 case -ESHUTDOWN:
808
809 dev_dbg(&urb->dev->dev, "%s(): urb shutting down with status: %d\n", __func__, status);
810 priv->flags.write_urb_in_use = 0;
811 return;
812 default:
813
814 dev_dbg(&urb->dev->dev, "%s(): nonzero write bulk status received: %d\n", __func__, status);
815 dev_dbg(&urb->dev->dev, "%s(): overflow in write\n", __func__);
816
817 port->write_urb->transfer_buffer_length = 1;
818 result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
819 if (result) {
820 dev_err_console(port, "%s(): usb_submit_urb() failed,"
821 " error %d\n", __func__, result);
822 } else {
823 return;
824 }
825 }
826
827 priv->flags.write_urb_in_use = 0;
828
829
830 dev_dbg(&port->dev, "%s(): submitting interrupt urb\n", __func__);
831 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
832 if (result != 0) {
833 dev_err(&port->dev, "%s(): failed submitting int urb,"
834 " error %d\n", __func__, result);
835 }
836}
837
838module_usb_serial_driver(serial_drivers, id_table);
839
840MODULE_DESCRIPTION(OTI6858_DESCRIPTION);
841MODULE_AUTHOR(OTI6858_AUTHOR);
842MODULE_LICENSE("GPL v2");
843
